Explosion-proof electric hoist details

Explosion-proof electric rope hoist  is our latest design and manufacturing standards of proof lifting equipment, the proof in the form of "flameproof"
Explosion-proof electric hoist, explosion exposed parts of the hoist with a special non-sparking material, explosion safe and reliable performance. Products through the Ministry of Machinery Industry Explosion Protected Electrical Products Quality Supervision and Inspection Center for Explosion Jiamusi sub-center performance testing, and presented proof certificate.
Explosion-proof electric hoist is a small light lifting equipment, explosion-proof electric hoist light weight, small size, lifting capacity, when the plant is filled with an explosive mixture, under the premise of ensuring safety is to improve working conditions, improve labor productivity powerful tool is the production of the necessary equipment.
Explosion-proof electric hoist's internal structure and its effects:
1, tap: electric  manual hoist  suitable for grid operation is required, generally have a high-voltage side of the transformer taps, can not fully guarantee tap synchronous switching, so there can not load tap running in parallel.
2, the voltage transformer: primary winding turns N1 ​​much less secondary winding turns N2, equivalent to a step-down transformer. PT at work at the primary and secondary windings are connected in parallel, respectively, in the primary circuit and the secondary voltage control loop coil. Therefore, if the secondary winding is short-circuited, will result in very large secondary current.
3, Used / drawer: Handcart and drawers are high voltage switchgear and low voltage switchgear part,lever hoist were installed high voltage circuit breakers and low voltage circuit breakers and relays and other components. They fixed switch function is basically the same, the main difference is to facilitate the maintenance and repair.

Common cause of the accident chain hoists summary

Common specifications are  wire rope winch   (0.5t \ 1t \ 2t \ 3t \ 5t \ 10t) six kinds , use, encounter accidents and other dangerous falling objects reasons summarized below want users to abide by the rules in order to ensure the hand pull gourd safe to use.

1 chain hoists lifting weights over from the weight of the provisions ;
2 lifting workers are still working under heavy walking ;
3 Pull the handle pull hoist too high or too low ;
4 horizontal pull the chain hoists or stayed ;
5 on the use of chain hoists lifting chain when bent or kinked still use ;
6 simultaneously with more than one chain hoists lifting a heavy object ;
7 found lifting hand chain pull them , yank or additional personnel ;
8 tossing hoists ;
9 hoists main force component corrosion , cracks, lack of strength or significant plastic deformation ;
10 wire rope or tie optional low base connection method is not correct, then do not tie securely ;
11 wire rope for wear or corrosion ;
12 Main load-bearing parts of the structure is not strong ;
13 lifting weight of ≥ main load-bearing parts of the limit.
Chain hoists performance mutations cause of the accident :
1 opponents pull hoist performance principles ,load chain institutions are not familiar with easily removable ;
2 Install chain hoist brake , the installation is not reliable ;
3 have not been unloaded after maintenance , overloading test that is put into use ;
4 friction surface of the brake oil ;
5 long chain hoists work load ;
6 complex work environment , rubs increase the weight ;
7 used without opponents pull hoist for safe performance measurement ;
8 Use chain hoists can not concentrate , resulting in cards chain , tripping , kink ;
9 Use yank bracelet, mechanical damage ;
10 Rear routine maintenance after use , improper storage .
Personal injury accident consequences chain hoists , equipment, facilities damaged danger dangerous class II level critical preventive measures
1 work should concentrate , to observe , to rational operator ;
2 before each use to make the necessary checks ;
3 chain hoists are complete and secure ;
4 seriously study the working principle of chain hoists and handling precautions ;
5 using chain hoists lifting when setting the necessary precautions around ;
6 immediately after use equipment maintenance , stored in a dry place to prevent moisture rust and corrosion ;
7 do not know who banned performance manual hoist  free disassembly ;
8 brake friction surfaces must be kept clean ;
9 carefully read the instructions for use .

Imports of the unique advantages of chain hoists

Import chain hoists manufacturing technology, excellent function for the domestic market, one of the products imported high-grade  lever hoist  has a beautiful appearance, small size, the use of safe and reliable, excellent strength machine; transmission efficiency, hand simple, hand-zipper feel good, to reduce operator's labor intensity and strengths.



Primary mechanical hoists imported high quality steel manufacturing, in the design and use of the function has the following characteristics:
Import chain hoists safe and reliable, durable; American pioneer chain hoists good function, maintenance cumbersome; import chain hoists, small size, light weight, convenient to carry; import  manual hoist   hand-pull small, high efficiency; American pioneer hand pull hoist construction progress older, beautiful appearance; compact design, steel structure, wear resistance, corrosion resistance and high strength chain hooks fit European safety norms have a unique structure, fine about, appearance and other characteristics, rigid, high strength, compact structure, strengthen anti-collision abilities can usefully maintain internal parts.
Import chain hoists purposes:
Import chain hoist is a simple to use, convenient to carry the manual lifting, chain hoists together for workshops, mines, construction sites, agricultural consumption, and quays, shipyards and warehouses for equipment machinery, lifting, loading and unloading of goods vehicles , a special open and no power on homework,hoist and trolley more of its primary function.
Import chain hoists can be used with all kinds of manual TROLLEYS supporting the use constitutes manual lifting and transport trolley, together for overhead monorail transport, manual single girder overhead cranes and jib crane.

Stainless steel ring chain lever hoist processing technology

In fact part of the stainless steel, both stainless nature, there are acid resistance, corrosion resistance. Stainless steel and corrosion resistance is due to chromium-rich oxide film on the surface (passivation film) formation. This stainless steel and corrosion resistance is relative, introduce you to the following  hoist equipment  steel processing technology details, for you to understand.



Tests showed that steel in the atmosphere, water and weak nitric acid medium and oxidizing medium, the corrosion resistance of chromium steel with the increase of the water content increased, when the chromium content reaches a certain percentage, the occurrence of corrosion resistance of steel mutation, that is, from rust to rust, never corrosion to corrosion. Many classification of stainless steel. The organizational structure at room temperature classification, martensitic,wire rope winch austenitic, ferritic and duplex stainless steel; by major chemical composition can basically be divided into chromium stainless steel and chrome-nickel stainless steel two systems; by Purpose then there is resistance to nitric acid stainless steel, acid-resistant stainless steel, water-resistant stainless steel, etc., can be divided into types by corrosion-resistant stainless steel pitting, stress corrosion of stainless steel, resistant to intergranular corrosion of stainless steel, etc.; classification according to features can be divided into no magnetic stainless steel, free cutting steel, low temperature steel, high-strength stainless steel and so on.
Because stainless steel has excellent corrosion resistance, formability, compatibility, and in a wide temperature range and other characteristics of strength and toughness,manual block so in heavy industry, light industry, household items and architectural decoration industry and other industries have access to a wide range of applications .

Solve two-speed electric hoist lifting shake

Two-speed electric  manual block  inspection work to do before use, in addition to the following three points can help you solve two-speed electric hoist lifting shaking problem.
The first point: Do not dramatic lifting loads
The second point: it slowly started moving laterally
The third point: Do not stayed
Do not lifting loads near the end of the beam side of the state to run. Lifting loads tweaking will encounter people and things or fall may result in death or serious injury. Load if tweaking, tweaking the more powerful,wire rope winch the more problems running the car, accompanied by danger. In principle, to make the load laterally tweaking. Therefore, please observe the following manipulation. Starting and ending in the electric chain hoist lateral movement, even comply with the above manipulation, lifting loads but also how much will be tweaked. At this point,rope hoist if the following manipulation, will be able to reduce the lifting load tweaking.

Mini electric hoist correct installation method

1, mini electric  manual hoist  the standard of work is single phase power supply running account, and you must use an outlet with a ground wire.
2, open the packing. Be sure to rope wrapped around the rope drum opened on paper tape, scored before the test machine, test machine if you hurry, you may cause rope rewind bashed limit aircraft.

3, avoid direct contact with the wire rope and stop frame, otherwise it will lead to the limit switch failure, causing mini electric hoist is not working properly.
4, do not let the mini electric lift hoist  to be exposed to rain or soaked in water, mini electric hoist protection rating of IP54.
5, the use of miniature electric hoist body can not move or rotate along the mounting rod.
6 Warning: Make sure all cables and micro electric hoist on a rotating or hot parts to maintain an appropriate distance.
7, if the mini electric hoist in the state did not fall, roll the last three laps rope coated with red paint can not be released.hoist equipment If continue down switch, wire rope on the rope drum will be rewound to make electric hoist operation upside down on the open, so that the limit switch will lose effect.

Mini electric hoist to meet industrial production requirements

With electric wire rope hoist  performance and increasing the mechanical properties of hard, speed range, speed and high precision, good stability, easy to control and energy-saving features, can well meet the lifting equipment safe and stable, reliable, good and reliable operability , maintenance and other requirements, mini electric hoist has been widely used in industry.
Currently, many electric hoist brands, can fully meet the needs of lifting products industry characteristics are not many, the main difficulty is due to the particularity of the crane, mini electric manual hoist  must have some special properties.
Fast dynamic response, in order to meet the changing needs of the crane load dramatic, ability to control a wide range of speeds, at low speeds can cause the motor around 2 to 3 times the rated output torque of the output peak torque load can withstand dramatic changes due to the potential energy the impact of current occurs, and ensure continuous and reliable operation of mechanical vibration environment, the deceleration of the motor can be reliably released renewable energy, the current capacity of the brake unit as the need for greater, with high reliability protection system,wire rope winch since the l organizations are required to pay special attention to mechanical brake is released before or after the moment of brake to prevent the "slip hook" of the control; possess powerful monitoring system, through the monitoring of implementation of various parameters of the system failure alarm and failure analysis.

Mini electric wire rope hoist selection criteria

Mini electric rope hoist  rope is in one of the main components, the number of broken wire rope, erosion (wear) the amount of deformation, the use of such length and fixed state should meet the national standard.

(1) wire rope used should meet the requirements, the connection method should be correct.
a. rope ends fixed platen should be ≥ 2 or with a wedge fixed on the drum and other member.
b. When the hooks and other devices extract in the lowest position (including pit), the wire rope on the drum winding number, in addition to the fixed rope tail number of laps, but must leave ≥ 2 laps.
(2) one of the following occurs rope should be scrapped:
a. rope around the post in a twisting pitch (refers to any one of the rope around a week shares axial distance) number of broken wires within the total number of wire rope of 10%.
b. lifting hot metal or dangerous goods, rope, broken wires scrapped its general bouncer inflatable take half the heavy machine,hoist and trolley such as broken wires phenomenon concentrated in the local, or six times the length of broken wire rope diameter concentrated in a shares on a prescribed shall be half that line scrapped.
c. surface layer of steel wire rope corrosion or abrasion of the surface of the original wire diameter of 40%.
d. rope diameter is reduced amounted to 7%.
e. rope obvious internal corrosion.
f. rope surface wear or corrosion, there are a certain number of broken wires, broken wires tension meter from the surface to the requirements of a and b are multiplied by the reduction coefficient is determined after: when wear or corrosion rates were 10%, 15 %, 20%, 25%, 30% -40%
, The reduction factor corresponding to 85%, 75%, 70%, 60%, 50%.
g. entire strand break or burn out.
h. partial outer rope elongation was "cage"-shaped or rope fiber core diameter increases more serious.
i. rope kinking, dead, hard curved, plastic deformation,hoist equipment hemp core prolapse severely deformed.

Mini electric hoist motor technology requirements

Motor most lifting equipment is the most important step, mini electric hoist motor is one of the technical requirements of this standard shall comply with the requirements in accordance with prescribed procedures approved manufacturing drawings and technical documents.hoist equipment Motor used under the following operating conditions, should be able to ensure proper operation.

The following details.

1, using the site altitude does not exceed 1000m.
2, the highest place of use of ambient air temperature changes with the seasons, but generally does not exceed 40 ℃.
3, the lowest place of use ambient air temperature is -25 ℃.
4, the wettest month of the monthly mean maximum relative humidity of 90%, while the average minimum temperature in January is not higher than 25 ℃.chain block Motor with class F insulation, when the altitude and the ambient air temperature meet the requirements of 1 and 2, the motor winding temperature rise should not exceed 105K, bearing allowable temperature should not exceed 95 ℃.
Mini electric lever hoist  lifting the rated load, the motor terminal voltage is the rated voltage 90%, to ensure that all agencies can work, for conical rotor motor and disc brake motor and a residual magnetic pull. When the three-phase power balance, the three-phase motor load current in any one phase and three-phase average deviation should not exceed ± 10% of the average three-phase motor rated power and rated the reference voltage, the stall torque , respectively, the maximum torque rated torque ratio should not be less than the guaranteed values ​​specified in Table 2.

Using miniature electric hoist should follow the following specification

In order to regulate electric  rope hoist  daily use and maintenance, to ensure the safe operation of electric hoist, stable, and must strictly enforce safety procedures relevant requirements.

One before using debug / checked
After a new installation or dismantling after the mini electric hoist, to be empty commissioning times. Not installed before the non-power operation.
2 installation or commissioning, check limit device is flexible and reliable, when hook up first limit position, the hook to the roll shell casings distance must be> 50mm lower limit position when the hook drops, should ensure that the roll wire rope safety circle, circle must be effective and safe in the more turns.
3 should be 125% of the rated load,hoist equipment lifting off the ground about 100mm, 10-minute static load test and check whether it is normal.
4 confirm the reliability of the brake status; adjust upper and lower limit stop module.
5 Check that the wedge is installed securely and reliably.
6 Check the wire rope is normal, if found bending, deformation, corrosion or wear serious, fracture extent exceeding the requirements, prohibited operation.
Two precautions in use
A miniature electric hoist shall hand manipulation, the manipulator should fully grasp their security procedures.
2 mini electric hoist in use by someone to check, paying particular attention wearing parts, and found fault,load chain immediately turn off the main power, to take timely measures.
3 is used, the absolute prohibition does not allow circumstances, and exceeds the rated load and nominal hourly closing times (120 times) of the cases.
4 in use, to maintain adequate oil and lubricating oil to ensure a clean and should not contain impurities and dirt.
5 prohibited by people standing on the lifting objects prohibited under strictly prohibited in the swing state of lifting, non-lifting of objects connected with the ground.
Three maintenance
A miniature electric hoist does not work, you can not put heavy objects hanging in the air, to prevent parts produce permanent deformation.
2 mini electric hoist maintenance work must be carried out in a no-load condition.
3 Adjust the amount of electric hoist brake down,hoist and trolley you should ensure that the rated load, brake down the amount S ≤ V/100.
4 rope oiling, you should use a stiff brush or small wooden pieces by hand directly to the non-working rope oiled.

Stage electric hoist normal voltage

Stage electric  wire rope winch  lifting equipment most commonly used in the process of using the electric drive, the following detailed explanation of your normal voltage electric hoist stage, we want to use your help.
The normal use of the stage hoist power supply voltage divided voltage rated voltage and operating handle. Rated supply voltage range of AC 220 volts to 660 volts, nominal frequency, there are two, namely, 50 and 60Hz, stage  load chain  during use, the use of premises voltage can fluctuate slightly, but do not exceed the rated voltage fluctuation range 10%.
Stage electric hoist operating handle voltage is 24V-36V, which is the AQSIQ mandatory requirement of special lifting equipment, low voltage can effectively protect users to protect against electric shock.
As lifting equipment and electric products, the use of safety critical stage electric hoist,manual block read the instructions carefully before use and precautions.

Explosion-proof electric hoist to see trends

With the lifting of the continuous development of the electric  rope hoist  increasingly stringent requirements, and in many gourd products which, especially in the explosion-proof electric hoist the most widely used because of its safety performance determines its scope of use. With you to see the domestic electric hoist trends.
Domestic electric hoist is to copy the form from the last century began production and development. July 1949 Beijing General Machinery Plant imitation German first successful trial proof electric hoist, and put into small batch production, 1953 Beijing imitation electric hoist plant trial of the former Soviet Union gourd general purpose proof electric hoist to hoist as lifting mechanism electric single-girder electric  lever hoist  , since then, the domestic electric hoist equipment to Beijing production plant mimic the former Soviet Union as the earliest single girder truss electric hoist, electric hoist factory in 1957, Beijing and Shanghai electric hoist manufacturers combined production drawings to be modified to produce the latest generation of explosion-proof electric hoist products.
As China's economy continues to develop and progress of science and technology, a new generation of explosion-proof electric gourd endless factory is a research and development design, precision manufacturing,chain block import and export trade, the net sales as one of professional manufacturer of lifting machinery, in the years of electric hoist production of which, we continue to accumulate experience, absorb advanced technology, to create a generation after generation of explosion-proof electric hoist good product.
Electric hoist through the current trends, boldly predicted that in the next few years, explosion-proof hoist equipment electric hoist will be towards a more intelligent and automated direction, its efficiency will be more high quality will be more exquisite.

Voltage transformer explosion-proof electric hoist introduction

1, tap: suitable for power system operation needs of the general high voltage side of the transformer has a tap, can not fully guarantee tap synchronous switching, so there can not load tap running in parallel.
2, explosion-proof electric  wire rope winch  voltage transformer: primary winding turns N1 ​​much less secondary winding turns N2, equivalent to a step-down transformer. PT at work at the primary and secondary windings are connected in parallel, respectively, in the primary circuit and the secondary voltage control loop coil. Therefore,hoist equipment if the secondary winding is short-circuited, will result in very large secondary current.
3, Used / drawer: Handcart and drawers are high voltage switchgear and low voltage switchgear part, were installed high voltage circuit breakers and low voltage circuit breakers and relays and other components. They fixed switch function is basically the same,hoist and trolley the main difference is to facilitate maintenance and repair of electric hoist.

Lifting belt scrapped norms

Lifting belt scrapped specification:
1, lifting belt is cut,wire rope hoist broken limbs, severe abrasions, rope or partial break loose limbs
2, the appearance of fiber severe wear, some thinning strands or wear any of the original strands 1/3
3, lifting belt presents breaking, there are remnants of broken fibers or particles.
4, showing the fiber to soften or aging,hoist equipment rough surface, easy peel fiber, elastic deformation, strength decreases.
5, severe bending or lifting with Norway distorted.
6, lifting belt looks too much dot loose, corroded.
7, lifting belt breakage:manual block Pull the strands, ropes eye damage.
8, has been scrapped webbing shall not re-use patch

Lifting belt maintenance home for

Lifting belt maintenance home for
1, should not be soft ring formed with any damage it may be possible to link up the installation.
2,rope hoist in the mobile lifting belt and cargo should not drag.
3, not so knotted.
4, the carrier should not make playing screwed.
5, should not be used without jacket lifting belt carrying a sharp corners,hoist and trolley edges of cargo.
6, should prevent soft ring opening angle beyond 20 °.
7, while the use of sling for a few,manual block should make the load evenly distributed.
8, lifting belt should be protected from light and no UV radiation under the conditions of storage.
9 should not be lifting with storage beside an open flame or other heat sources Sakon.
10, do not apply when the sling should be placed in a dedicated shelf.

Avoid overloading hoists commissioning and corrosion protection

Chain hoists and other lifting equipment, while prohibiting overloading used, but overloading phenomenon still exists, due to overloading caused by the use of lifting incidents have also occurred, in order to avoid overloading  chain block  , so to limit the development of the debugger, but the debugger , some matters should pay special attention.
(1) To simplify the debugging process to improve numerical accuracy, debugging using electronic crane, chain hoist in the specification more weights can simplify the configuration;
(2) run-in phase should focus on before the whole assembly, if the conditions can be configured ergometer, positioning device, control system established to reduce the work running test bench strength improve work efficiency;
(3) hoists the load limit load debugging adopted, try to set a different interval, the same specifications used when debugging the load slightly larger slip values​​;
(4) load limit not a substitute for  manual hoist   factory debugging dynamic load test, because two persons emphases and different ways, and load requirements are not the same.
Based on the above considerations debugging load limit chain hoists, hoist load limit can greatly improve the accuracy and stability.
Rust-proof chain hoists work is essential, not only affects the overall appearance of the gourd with a great influence on the future use, chain hoists antirust measures described below:
(1) chain hoist hook bearing, to inject calcium-based anti-rust grease to rust.
(2) the various parts of the body  lever hoist  the machined surface of an exposed table exposed threaded surface, painted barracks or other calcium-based grease rust rust grease.
(3) chain hoists body gear box, gear should be coated with anti-rust grease oil barium sulfate, and shall be regularly inspected corroded and protection. Such as rust, chip or bamboo hardwood hang required to re-rust oil coating.

Electric hoist startup procedure describes

Electric hoist startup process is measured from power,hoist and trolley the rotor speed is increased from zero to the rated value in the process, according to the characteristics of the DC electric hoist, it is commonly used in start-up mode with full pressure start, the string into the start-up and step-down start rheostat three.

Electric hoist hanging objects running in conditions permitting, the best hanging around 0.5m from the ground, by professionals in the electric hoist hanging objects help steady the object behind and around obstacles under the command runs. Do not run electric hoist intermittent,load chain long-distance running, it is best to send electricity long run as well. Electric hoist hanging objects should be to ensure the smooth running, electric hoist if hanging objects swing or jitter, should be running side edges steady running hook, not let it shake or swing.
When the armature windings of electric hoist power, its current rapid rise, resulting in startup counter, driven rotor and counter electromotive force generated, with the rise of the rotor speed,chain block back EMF increases, the armature current decreases, start switch cabinet down, the rotor speed increases slowly when starting electric hoist with load counters counters equal to regional stability, speed, start over.

Chain lifting mechanism and working principle

chain Block are widely used in industrial and mining enterprises, warehouses, commercial, medical and food service areas, elevator can be installed in the floating beams, curved rails, and fixed lifting heavy objects can also be installed in a cantilever crane rails, workpiece and the machine tool fixtures, etc. lifting heavy objects and so on.
Lifting mechanism by the lifting chain sprocket, chain and chain guide frame device component. Chain of imported and domestic materials are high-strength alloy steel, made by the introduction of advanced equipment chain professional factory steel and heat treated, high strength,wire rope winch good wear resistance.
Electric hoist chain through chain guide device, sprocket engages smoothly and reliably, the chain can be promoted successfully stored in a box set of chains, which have anti-pollution requirements and clean workplace is very suitable, such as hygiene and food service areas.
Sets electric  manual hoist  and chain hoists on the merits, it is powered motor with disc brake, planetary gear reducer, compact structure, small size, light weight, high efficiency, reliable braking, easy maintenance, etc. , versatility, is to improve working conditions, improve labor productivity, ideal for lifting gear.

What areas need to set up warning signs chain hoists

Chain hoist is small  hoist equipment, lifting machinery used as safety-critical, the following chain hoists to introduce you to the field devices and the use of what needs to set up warning signs.
Chain hoists and stop signs is prohibited under normal circumstances people are not allowed to set up some kind of action, signs, generally use the red flag. Chain hoists device itself required to set this flag places are:
(A) emergency switch;
(2) buffers, sweeping track plate, rail end stops and the rising limit position limiter;
(3) size of the car slide wire, cable reels.
(1) hook pulley side,lever hoist extract device and lifting beam;
(2) chain hoists turn tail and balance weight;
And with the use of a crane hoists the following places also need to have warning signs
(1) jib boom crane jib head;
(2) Crane extended leg and cowcatcher;
(3) In addition to mobile and railway cranes, but with less than 2m from the ground and overhaul of the cab bottom hoists,manual hoist trolleys balance beam and a lower beam on both sides;
(4) The end beam bridge crane outside (it was OK channel) and end surfaces, mobile cab at the interface between the platform and ladder protective railing.
Lifting equipment operators should strictly follow the rules and regulations work equipment has to ensure work safety.

Electric chain hoist After setting should also confirm what?

Electric chain hoist and not immediately after the installation started, the following points should be confirmed,manual hoist gourds before operation.
1, the power cable is fixed on the cable support.
2, the power supply voltage is the rated voltage of 5, connect the ground wire is being accurate.
3, chain electric hoist transport bolts, nuts, pins, etc.hoist and trolley without loss ashamed. Ensure fastening,manual block fully assembled.
4, key switch is being effectively used to protect rope installed to protect the rope pulling key switch is affected by force.
5, commissioning chain hoist must be strictly checked flexible limit device reliability.

People often mention electric hoist lifting height is?

  Many procurement officers in the inquiry of the product due to electric hoist is not very understanding,rope hoist when the sales staff asked to lifting height and other professional problem is bewildered, and today the purchase of electric hoist often asked questions "electric hoist lifting height What specifically refers to the distance between "doing the following answers for your reference:
       Mentioned electric hoist lifting height h,lever hoist in fact, refers to a hook at the bottom of the orbit distance from the lowest point fall, some electric hoist extract device down on the ground or track below the top surface, the interval is called drop its decentralized depth. Then hoist in actual use, shall not exceed the lifting height.
       Wire rope electric hoist lifting hook height is the upper limit position and the distance between the lower limit position,chain block and by adjusting the vertical stroke protection off the fire stopper can change the hoist lifting height.

Electric chain hoist operation failure how to solve?

    Electric chain hoist can be realized in the car comes with beams up and down and move around, particularly widespread field of use, greatly improving the work efficiency, but in the course inevitably encounter problems, load chainsuch as malfunctioning of the problem is a recent customer's one, the following summary for you to solve the electric chain hoist malfunctioning commonly used methods:
       1, the power supply voltage is too low.
       Solution: measured voltage value is less than the scale of more than 10% of the supply voltage.
       2, see the power of the original line phase is connected correctly, as it will lead to a wrong start phase protection and can not be manipulated.
       Workaround: two phase power line swapped.
       3, the control  wire rope hoist  circuit fuse burned.
       Solution: Check and replace fuse accurate
       4, the power fuse or no fuse breaker tripped.
       Solution: Check whether the current demand, replace the appropriate fuse or no fuse switch restarts.
       5, power lines or control circuit wiring fault or not connected.
       Workaround: poor contact wire breakage and repair or replacement.
       6, electric hoist motor sound, but did not rotate.
       Solution: Check the motor phases is accurate - Repair and well insulated action.
       7, the emergency switch is pressed.
       Solution: Make sure the emergency switch is pressed causes.
       8, the contactor coil circuit.
       Solution: Replace the contactor
       9, the contact is faulty.
       Workaround: manually operated hoist,manual block electric chain hoist if normal operation, the control coil or wire represents a poor contact, poor position to identify and fix it.

Electric wire rope hoist five areas that need improvement

         The gap between domestic and foreign electric hoist quality in terms of technology or shrinking, many domestic electric chain hoist and manual hoist is gradually out of the country,hoist equipment the following summary of the current status of wire rope hoists the following five areas that need improvement.
1, supporting the motor
         CD1 type electric hoist supporting the conical rotor motor, single speed 4-pole, double-speed of 1/10 of the picture plane, and foreign wire rope hoist motor with 2 pole motor, two-speed dual windings and pole type, so simple structure, small size, light weight, help to reduce manufacturing costs. In addition, CD1 electric hoist matching motor in insulation class and degree of protection and noise as compared with foreign hoist the gap is still very large.
2, reducer security measures electrical control
         CD1 type electric hoist gear reducer manufacturing precision and low efficiency, noise, gear design parameters is not reasonable,hoist and trolley especially reflected in the carrying capacity and improve levels of gears and gear pairs equalization between the intensity.
3, security measures
        CD1 electric hoist only, the lower limit protection, overload protection. While foreign wire rope hoist addition to the protective function, but also has the wrong phase, phase, thermal protection, multi braking system protection.
4, the electrical control
         CD1 type electric hoist electric control box appearance, poor coordination, electrical component life low failure rate.
5, component design
         CD1 electric  rope hoist  hook, electric trolley system and other key components, a set of design and interchangeability is poor, and the structure is relatively bulky.

Favored by the joint frequency electric hoist

    Increasing domestic electric hoist type,hoist equipment in order to meet the diverse needs of people, came into being in recent years frequency electric hoist, hoist inverter is the use of the power frequency inverter changes to control motor speed, frequency electric hoist with its joint venture advanced technology, competitive prices by lifting the field of all ages.
Joint frequency electric hoist so favored,manual hoist especially the unique advantage, can reduce the starting frequency gourd, suspension shock when working with a smooth function, it can reduce the start aborted shock, unusual for mold and other devices are not allowed fine oscillation work environment. In addition to a major feature of frequency can hoisting speed is 1/10 of an additional extra speed to be set between the speed,load chain you can choose the most suitable operating speed. Under load, the lifting speed can speed up to 1.5 times in extra extra speed can be set between.

Cordless power dynamic phase electric hoist

    Wireless Electric Hoist with 220V, suitable for all occasions, can enhance the 1000 kg of cargo, especially for high-rise buildings from the downstairs lift heavier daily. Wireless electric  wire rope hoist  simple structure, easy installation, small size and power as a power source with a unidirectional. Hoist the main structure: reducer, running organizations, drum equipment, hook devices, couplings, flexible cable current into the device, limit switch, motor with cone rotor motors, set the power and braking force in one.
Wireless electric  wire rope winch  lifting capacity :250-500KG (single rope 22m * 250kg double rope: 11m * 500kg)
Wireless electric hoist lifting height: 1m-22m, working class: M3
Hoist speed: 20 (30) m / min, lifting speed: 8m/min
Electric hoist input power: 1020W
Wireless electric  lift hoist  can be used with bridge, gantry, overhead crane, the message after adding the transformation can also be used as a winch. Therefore, it is to improve labor efficiency, improve working conditions necessary machinery.

Common types of lifting chain

  Lifting chain with unusually broad, as technology innovation, the type of chain is also increasing, the following describes your usual chain species.
       load chain  according to different uses and functions can be divided into traction chains, transmission chains, conveyor chains and special chains, etc. These four types of special.
       1, traction chain: for the Laye and lifting chain.
       2, the transmission chain: mainly used for power transmission chain.
       3, conveyor chains: for the transport of materials chain.
4, for the special chain:manual hoist mainly used on special mechanical devices, with special features and structure of the chain.
In similar products, according to the composite lifting chain's basic structure, that element shapes, with the chain meshing parts and parts of parts between the size ratio and so divide belongs chain products; press chain components and the materials, chain attachments and hinge structure divided varieties; press pitches, rows, ultimate tensile  load chain  width and the different divisions specifications.

How to check the hoist contactor

    Contacts play a controlling role in the whole electric hoist work play a very important role in our daily work should pay attention to check the contacts section.
1, the contact with copper drops grotto file level contacts polished,manual hoist mechanical strength enough or overtravel reach the required value, replaced with new contacts.
2, to maintain the thread does not burn pine, screws tight weeks, the insulation to keep clean.
3, the contacts of the contactor contact width should be greater than 3/4.
4, arc cover intact, no card contacts, arc suppression coil is not shorted.
5, the contact should be kept open enough distance and overtravel.
6, a contact that is connected to the contact while the deviation does not exceed 0.5mm.
7, requires electric hoist contactor operation light and flexible,lever hoist bearings need regular lubrication.
8, anyway, turn contactor mechanical interlock should be adjusted appropriately when a contactor contact will be contacted, another contactor contacts is not closed, the gap is not less than 3mm.
9, electric hoist contactor magnet contact area should be greater than 75%, the contactor magnet can not skew can not be jamming, manual block and the magnet surface should be kept clean.

Acceptance CD wire rope hoist

      CD, MD electric  wire rope hoist  to be inspected and accepted before shipment to the factory, inspection should be checked before the first wire rope hoist each lubrication point has added amount of lubricant, all parts are complete and intact. Fasteners are tightened. The slide and the wire wound on the reel correctly. Disconnecting the power circuit in the case, check whether the line is properly manipulated. Ensure that the drive mechanism is flexible. Check the formal acceptance test after a good start.
(1), no load test wire rope hoist
1, no load test should be carried out under the rated voltage and no load.
2, no load test should verify that:
a. rope electric hoist motor rotation;
b. limiter, control buttons,load chain and other electrical equipment, electromagnetic brake flexibility and reliability;
c. lift, whether the direction indicated by the direction control button;
d. deceleration institutions should be normal, no noise.
(2), static load test wire rope hoist
In the case of operating agencies do not move to 1.25 times the rated load of test crane, load elevated ground about 100mm, suspended for 10 minutes, should be stable and reliable, the sound normal, the load does not decline.
(3), wire rope electric hoist dynamic load test
1, at rated load test, agencies should be normal, after braking distance should not exceed the load down 80mm, brake response time exceeds this value adjustment.
2, more than 10% of the rated load for load test, repeated start lifting mechanism and travel agencies,hoist equipment should be achieved:
a. load does not fall;
b. smooth action, no jumps;
c. brake no noise, braking smooth and reliable;
d. temperature to normal, the brake magnet temperature does not exceed 80 ℃

How to select the right chain hoists

In recent years, low-quality  chain Block  gradually increased, mainly due to the number of small enterprises in order to reduce costs, thereby reducing the production of investment goods, most chain hoists accessories are used with external processing or production chain hoists used equipment parts assembled, reduced parts of the standard size, material, lifting chain welding surface treatment, low-cost chain hoists to be produced without any guarantee of quality, of course.
       Remind you to buy before the  manual hoist   must check the packaging, production date, gourd material degree and product shelf life and so on. The contract must be signed by both parties save. Here's how to select the right chain hoists, for your reference:
1, in normal use, the hand chain hoists chain will be stuck.
2, the normal use chain hoists lifting heavy objects will appear downturn.
3, the use of chain hoists lifting heavy objects can not only occur when the next situation.
4, when the upper and lower hook plates,lever hoist severe deformation does not work, can not guarantee things will not be hanging slip hook.
5, in the safe use of load chain hoists, chains, hooks and other load bearing parts may deform or crack and so on.

Explosion-proof hoist hoist brake difference with the ordinary

Although there are explosion-proof electric rope hoist  electric hoist single electric hoist brakes and brake CD1/MD1 still there is a big difference, explosion-proof electric hoist brake parts appear worn with friction gasket thickness up to 50% of the original thickness, cracks or spring plastic deformation of the small diameter shaft or wear up to 5% of the original diameter, the above three cases should be scrapped. Brakes for you to explain the difference between the following lies:
1 explosion-proof hoist brake band should be articulated,manual hoist not with bolts, riveting, welding and other forms of rigid connection.
2, the brake wheel surface roughness of 1.6,wire rope winch the surface hardness of HRC40 ~ 45.
3, the brake wheel center line and the center line of the stopper Concentricity 0.030mm.
4, proof hoist brake wheel and brake band brake contact area with the area of not less than 75%.

Electric hoist control failure, oil spills how do?

   Electric  wire rope hoist  lifting field is the most frequently used small lifting tool that uses various problems arising in the process greatly affect the efficiency, electric hoist for the process of using the following two situations encountered by customers following explanation, for your reference:
       1, the electric hoist can not stop or to the limit position remains Parking: most electric hoist can not stop the main contacts of the contactor is welded, when the  hoist and trolley  is stopped pressing the switch, the contacts of the contactor can not be disconnected, so that the motor as usual operation, the hoist does not stop. If the hoist to the limit stop position remains as stopper failure, this happens, immediately cut off the power, the electric hoist forcibly stop. After stopping, repair contactors or stopper, serious damage can not be repaired and must be replaced in order to work properly.
       2, electric hoist reducer oil spill reason: reducer joint screw not tightened, after the shutdown, you should tighten the screws. Gourd between gearcase and cover, seals defective assembly or failure damaged, repair or replace the seals should be removed, you can prevent the leakage problem.
       With the lifting industry continues to evolve, electric lift hoist  manufacturers after another, resulting in low quality gourd growing in recent years.

Synchronous lifting hoist Precautions

Synchronous electric chain hoist lifting Precautions:
        Under normal circumstances people are choosing to use alternative electric chain hoist manual hoist s hoisting construction groups in the new tank, large oil tank welding, etc., can greatly reduce the labor intensity of construction workers and improve working efficiency. However, the construction of the tank lifting hoist how to avoid overloading operation is to improve the efficiency and safety of the key, but also need to attach great importance to the construction team for each question.
        First, the overall weight of the tank must be calculated correctly, generally selected from the hoist that the total weight of the overall weight of the tank 1.3 to 1.5 times. After determining the number of units of electric hoist, to accurately calculate and determine the spacing of hanging points, each lifting point spacing must be equal and balanced distribution. Requirements for the first time since the construction process less open sunroof, so for the first time hanging point to as little as possible, except for the first hanging point requires consistent spacing, but also consider the balanced lifting points after setting, in order to maintain equal spacing of each single lifting point, as far as possible electric  chain block s are set to run to create the conditions.
        Based on past experience in construction, for the first time hanging point is generally selected hoist half the number of units, the second hoisting construction has been completed, that is, in a timely manner before the third layer lifting up into the rest of all lifting points uprights, hang entire electric hoist, all put into the third layer lifting operation. In improving operations, up to the experienced professional rigger professional rigger is responsible for on-site commander.
        Despite the selected hoist safety factors have been taken into account, but because HHS-10t low-speed electric chain hoist is used in disc brake three-phase asynchronous motors, brake asynchronous motor characteristics, so that different motor speed is inevitable exist some differences, which determines the electric hoist speed can not be completely synchronous operation, especially with the overall lifting of continuous operation time longer, increase the speed difference accumulation, making the hoist between the actual load changes Some electric hoist lifting slowly bearing constantly reduced, or even no bearing; while some electric hoist Since l fast, carrying increasing, hoist the possibility of running in the event of overload continues to increase, in this case if the viewer is not note that the individual is likely to occur  hoist equipment  overload operation. Which in turn increase to the overall construction hoisting lifting of the moment, with construction experience first hand down the perceived tightness of the chain hoist, move the adjustment loose or tight single hoist up or down until the chain tightness basically the same before the official start upgrading; during normal upgrade process, you want to send someone constantly monitors the functioning of electric hoist, electric hoist visually observed whether the shutdown and the tightness of the chain; motors and hoists with ears whether there is abnormal operation sound, if unusual, timely stop, identify the cause and adjust the chain tension, electric hoist for failure to timely replacement and maintenance. Erection occurs during the trip, burning fuse the situation, the more you want to inspect the hoist load, adjust the chain tension and so on.
        Also, according to each lifting height and construction schedule, appropriate adjustments to the number of checks intermediate stop. Normal run-time jobs each intermediate stop to check 2 or 3 times, if it is appropriate to increase the down-storey increase the frequency of inspections;wire rope winch near the end capping layers, not only to increase the number of intermediate stop to check, but also to strengthen the monitoring operation of hoist situation, because with the increase of the total load, electric hoist overload occurs also increases the chance of running.

Electric hoist load sway control method

Electric hoist lifting equipment in the most common, most electric  rope hoist  used by people to follow the control button on the ground, or can be manipulated or used in the driver room wired (wireless) remote control. Use, the absolute prohibition does not allow circumstances, and exceeds the rated load and nominal hourly closing times (120 times) use case, should not be overloaded with the following summary hoist load sway control method for reference:
Electric hoist load sway control method:
Load if shaking, shaking the more powerful, the more difficult the operation of the car will be a security risk, in principle, to make the load lateral shake, so the use of electric hoist, please follow the following operations;
a. Do not stayed
b. slowly start to the lateral movement
c. Do not dramatic lifting loads
Starting and stopping the  lever hoist  electric chain hoist lateral movement, even if compliance with the above operation, lifting loads but also how much will be shaking.
At this point, if the following operations will be able to reduce the lifting load sway.
1) Press the traverse key "figure a"
2) the car begins to move, the load will be slightly delayed "in graph b"
3) the load before going to swing to a central location, close keypress
4) When the load chain lift hoist  back just below when the switch is pressed again, "drawing c", so that lateral movement in this state.

Overhaul of the basic requirements for construction machinery

  1. Overhaul of the technical evaluation before
      Currently, the project is to restore the machine some more performance overhaul repair of the machine after a longer period of time after the operation, the major components and assemblies of aging have reached the limit, it should all be the disintegration of the machine, cleaning, inspection and repair, achieve its performance standard at the factory.
Construction machinery overhaul is necessary before technical appraisal techniques used by the person in charge of the unit, management, maintenance and driving personnel to participate, the various components of the machine are not pre-dissolution pressure, flow, temperature and torque and other performance testing, and reviewed technical and operational records and other data files, a detailed assessment of the consumption of fuel and lubricants,hoist and trolley and make a detailed record. Then the original information provided by the manufacturer overhaul parameters be compared in order to determine whether repairs are needed.
Determine whether mechanical engineering major overhaul and technical conditions are:
⑴ engine performance indicators fell more than 20%; oil consumption exceeds the fixed value of one times; engine cylinder pressure when the temperature reaches above 45 ℃ when measured less than the required 60% of the index.
⑵ transmission main parts wear reaches the limit level, there is yaw, abnormal noise, shock and jitter phenomena.
⑶ steering worn gap is too large, manipulation failure; transmission gear and shaft wear serious, difficult or often jump shift gear; severely worn brake mechanism, braking performance degradation or failure and can not be adjusted.
      (2) repair method of choice
      Construction machinery into the plant overhaul,chain block the response to the disintegration of the parts are grouped, measurement, inspection and appraisal, and the assembly of the various components and the engine cylinder, crankshaft, etc. abrasion testing, in order to obtain a basis for whether to replace. Generally wear large moving parts need to be replaced; inconvenience for some replacement parts, should adopt welding, thermal spray, brush plating and chrome and other technology to restore its original design dimensions. Not guarantee the quality, the need to replace parts shall be in accordance with the requirements of the original manufacturer or designated collaborative purchase of spare parts manufacturers.
Repair method is divided into: repair and replacement assembly for motor repairs. The car repair method, that is, during the repair parts are sequentially removed from the machine, after washing, detection, classification, and repair or replacement, and finally reassembled in order to achieve the recovery performance of the repair methods. Law on car repair repair downtime longer occupied.
Replace assembly repair method, is in the repair process, in addition to the original rack renovations, the only remaining assembly is damaged or accessories all removed, replaced with pre-prepared (or repair) good assembly or accessories , and then assembled into machine repair methods. This method can significantly reduce downtime repair time, help to improve repairman efficiency, reduce costs and ensure the quality of maintenance. This is also the most popular American maintenance system maintenance methods, which increase the use of machinery and equipment intact rate units, utilization and production efficiency of great significance.
      3 Cautions
      ⑴ taken to exclude security risks. Overhaul process should be taken to exclude security risks, such as: adjusting brake clearance, replace worn clutch friction plate and the cab seat can be easily adjusted up or down, and the removal of some of the drivers and maintenance personnel likely to cause injury and machine failure security risks. Enhance driver awareness of labor protection, making the machine dangerous experiments, sufficient space should be left around and protective facilities (such as: electric  wire rope hoist  maximum load operation during the experiment wounding accident prone disintegration).
⑵ do overhauled tracking service. Build construction machinery overhaul maintenance files, and the unit should be repaired within a certain period after repair works to ensure mechanical energy to achieve the specified performance and good condition. During this period, such as general failure occurred, after adjustment to get rid of those who should be using the units themselves. Eg due to larger changes. Mechanical damage, severe oil spills, leaks, leakage and leakage and other major components must be disassembled for repair, the unit should be serviced by a joint notification repair unit inspection, timely repair to reduce downtime,manual hoist so after Overhaul the machine can be kept in good working condition.

Fracture Analysis sling occur

    Lifting sling is lifting, handling operations an important auxiliary tool, which includes wire slings, straps, hooks, steel clamp and so on. Sling with a wide variety of complex use of the environment, the use of large and uneven quality of personnel, risk factors,hoist and trolley and more, great harm. If used improperly or mismanagement, prone to accidents.
      For some companies in recent years fracture accident occurred in a sling, combined with years of safety management practice, sling rupture causes a careful analysis, and proposed preventive measures to ensure the safe use of a sling.
      1. Sling manufacturing irregularities
      Currently, companies use the sling into professional factory production and business homemade two parts. Sling professional manufacturer of the product quality, but off is the cause of the accident is an important reason. Some sling manufacturers do not follow the national standard production and testing products. Such as: 1999 factory bought 8 rated load 10 tons of Circular Welded chain, which has a sudden break in use. After examination, the chain breaks open welding seam obvious, belonging to neither certification nor the inspection mark and quality grade mark of the "three no" products.
      Some companies buy sling out, it is also full use of their existing equipment and human resources, their processing and the production of some number of single process is simple sling. Enterprise homemade sling, its randomness and blindness larger in the selection, to determine the size and production methods, often depending on their experience,chain block manufacturing quality and safety performance is difficult to achieve the requirements. Such as: a workshop in 2000 forged a two tons of small hooks, With no national standard DG series steel (using ordinary 45 # steel) manufacture, in use, the hook was straightened, hanging objects falling, almost led to casualties.
      2. Sling using the low quality of personnel security technology, poor safety awareness
Sling using technical quality and safety of personnel security awareness is not strong, not only affects the quality of the lifting operation, but also directly related to the user's personal safety. Its performance are the following, first, use of personnel safety consciousness. In the production process, some sling use of personnel emphasis on production safety, to grab the progress, time duration, simplify operating procedures, or even illegal dangerous operations and stuffed hair accidents. Second, some of the safety technology used low quality, they do not understand the basic performance sling and use requirements, but do not know how to calculate the center of gravity and determining hanging objects hanging method, so that in the specific operation, arbitrary, can lifting safety can not be guaranteed, then completely rely on hit "Grand Canal."
      3. Sling has not been included in the safety management of normal channels, extensive management
      Currently, sling safety management, the State has not developed a standardized management standards, companies are lack of appropriate safety management system, resulting in a sling safety management in a loose state. On the use of units (enterprises) in terms of a sling into use, by what sector management, long test time and by whom checks,lever hoist to what standard to be repaired or scrapped, which are impossible to implement. Resulting not timely detect and eliminate hidden dangers exist sling, sling so that part of the long-term "sick running" until an accident. Furthermore, the production plant or process is concerned, no one managed to implement fixed, fixed storage. Who is who take, littering after use, which makes the sling greatly increased chance of breakage.
      In addition, lifting the driver to improper operation, lifting up the stopper is caused sling failures and other fracture is an important reason.

Electric wire rope hoists fixed, run type

  Electric wire rope hoist mainly in two forms,load chain fixed and running car type, widely used in factories, ports, docks, warehouses, garages and other places used more widely Lifting and handling equipment.
       Fixed major fixed rope hoist is directly fixed to the beam, the beam is installed on such architecture, some with large string to wear nail holes in the top rope hoist or other means and so on. Running trolley wire rope hoist mounted on single beam, dual-beam, cantilever,hoist equipment gantry cranes and do walk up and down is a very flexible operation of lifting gear.
       Electric wire rope hoist into single-speed and two-speed, fast to improve the efficiency of their work to improve your working conditions and job security situation greatly improved the company's efficiency and labor efficiency, while dual-speed electric hoist one is the same constant speed can be work,rope hoist and the other is used in high-precision slow places use.

Supervision of Special Equipment Inspection Inspection Program

Special equipment manufacturing supervision and inspection, including application, acceptance,rope hoist supervision, inspection, supervision and inspection certificate issued by procedures such as:
1 Applicants
For supervision and inspection of manufacturing units shall apply to the local Quality and Technical Supervision, together with a copy of the following materials:
(A) manufacturing license (copy or photocopy);
(2) The main products manufactured and production planning.
Installation and reconstruction of application maintenance supervision and inspection units fulfill the formalities, Quality and Technical Supervision belongs to the local special equipment inspection and testing institutions to apply,hoist and trolley along with a copy of the following materials:
(A) the construction of this book (photocopy);
(2) construction contracts;
(3) construction plans.
 
(2) accept
Local Quality and Technical Supervision, Inspection and manufacturing applications received, after examination that meet the requirements, be entertained and inform the respective institutional arrangements for inspection supervision and inspection work, and notify manufacturing units.
Installation and reconstruction of inspection and testing institutions received Supervision, Inspection and maintenance of the application, after examination that meets the requirements, it shall make arrangements for supervision and inspection work, and notify the Installation and reconstruction of maintenance units,
3 Inspection
Manufacturing Inspection:
Manufacturer shall supervision and inspection agencies at the scene to provide the following materials and conditions:
(1) production planning;
(2) Quality Management Manual and related management systems;
(3) the quality of management, professional and technical personnel and professional and technical workers certified personnel lists and documents;
(4) manufacturing equipment design documents, manufacturing process documents;
(5) The manufacturing process of the various inspection and acceptance information;
(6) the establishment of service with the supervision and inspection work;
(7) the necessary working conditions;
Inspection and testing institutions should be based on the output of manufacturing units,hoist equipment in line with the requirements of the inspection personnel engaged in the supervision and inspection work.
         
Installation transformation maintenance organization shall provide the following materials at the site and conditions:
(A) construction plans;
(2) Quality Management Manual and related management systems;
(3) the quality of management, professional and technical personnel and professional and technical workers certified personnel lists and documents;
(4) equipment factory file, install the transformation process and the corresponding maintenance of construction design documents;
(5) the construction process of a variety of inspection, acceptance information;
(6) the establishment of service with the work;
(7) under the supervision and inspection of the situation, you need to set up a fixed office space in the field, to prepare the necessary working conditions.
Inspection and testing institutions should be based on condition of the equipment, arrange to meet the requirements of the inspection personnel engaged in the supervision and inspection work.
4 Supervision and Inspection certificate issued
After inspection and testing institutions supervision and inspection, that the production process, equipment safety performance of technical safety requirements, according to Taiwan (cylinders by batch) issued by the special equipment safety supervision and inspection certificate (certificate, one copy); in the production process problems found, issued by the special equipment safety supervision and inspection contact list or advice notices.
Supervision, Inspection and specific provisions see Special Equipment Inspection rules of technical safety.

Supervision of Special Equipment Inspection

Inspection procedures and requirements
(A) Eligibility
Manufacture and installation of special equipment for transformation service (hereinafter referred to as production) process supervision and inspection shall meet the following basic requirements:
1 manufacturer shall obtain manufacturing,hoist and trolley installation, alteration, repair permits, within the validity period;
2 Install the transformation maintenance of construction has been informed in accordance with the provisions of the construction;
3 installed equipment manufacturing license is obtained product manufacturing units,wire rope winch and comply with the safety requirements of the technical specifications;
4 The transformation maintenance equipment has been handled using the registration;
5. Production quality management system is operating normally;
6 There is scope to adapt the production safety of technical specifications and standards;
Specific conditions and requirements contained in the relevant supervision and inspection rules of technical safety.
(Two) implementing agencies
AQSIQ approved quality and technology supervision departments at all levels of special equipment inspection and testing institutions. Manufacturing Inspection in accordance with the principle of territorial management, from the location of the test with a detection range of provincial and municipal agencies responsible for implementing the test detects the specific implementation by the Provincial Quality and Technical Supervision planning agency, to the public, written notice of manufacturing units.
Installation and reconstruction of maintenance supervision and inspection by the local inspection and testing with the scope of inspection and testing agencies, the specific scope of inspection and testing by the Provincial Quality and Technical Supervision arrangements to the public.
 
(Four) deadline
1 license authorities received the application and implementation of the information, shall,wire rope hoist within 5 working days to complete the work accepted, make arrangements for supervision and inspection of whether notice.
2. Supervision, Inspection and must meet the requirements of its production activities, supervision and inspection work is completed, general equipment shall, within 5 working days of inspection reports issued by oversight, large equipment shall be issued in 30 days supervision and inspection reports.

Electric chain hoist is installed correctly process and notes

Install electric  chain block  is allowed to work correctly the first step,
First, install chain hoist must first install the chain box;
Second, connect the power cord: Connect the power cord must be cut off in advance. Meanwhile ground should be well grounded, otherwise the operator touches any part of the chain hoist or when you are likely to feel a shock feeling.
Third, lubricate chain hoist load chain: the chain lubrication level is a load chain life is an important factor. Timely and effective lubrication of the load chain, in order to ensure the effective life of the chain.
Fourth, check the chain arrangement: For multi-line chain, electric  manual hoist ,  the hook should ensure that the next frame will not be overturned. If you flip it back to its normal state, to ensure the chain of weld arranged in rows. Finally, check the operating voltage: Because electric chain hoist factory, is based on a user-specified voltage or high voltage equipment, check the wiring and make sure the power supply voltage requirements are met.
  Tips: Installing electric chain  lift hoist   if the improper voltage operation, may cause electric chain hoist causing serious damage.

How to repair and fix because of power outages caused by the failure to hoist

General electric hoist is a lot of construction machinery will be used, but even the best machines will have trouble, when, where mainly solve recurring failures such as power outages. Mainly because of power outages did not hoist the rated working voltage is turned, unable to work,manual block the reason there is a solution with the power supply system is not right to send electric power electric hoist, hoist the main, the control circuit of electrical damage, the line is disconnected or bad , such a situation, the need to repair the main, the control circuit, be sure to hoist the motor is disconnected from the power line, when the confirmation Lord, control circuit trouble, before re-commissioning; hoist motor starting torque is too small, so hoist lifting not moving goods, and can not work, check with a multimeter or voltage meter and other measuring motor input voltage, indeed due to low voltage,load chain so that the motor can not be started, the need to restore the normal system voltage, etc. before using electric hoist. Do not overload the production of an electric hoist, when the goods are excessively overloaded, do not move cargo crane hoist motor only make noise, but not running, and in severe burning motor, or even cause an accident, then should immediately stop using the hoist in the lifting process occurred broken teeth, broken shaft brake failure occurs, conventional electric hoist can not play a protective role in the accident consequences will be disastrous. Load protection overload protection is common, for some special circumstances, requiring electric hoist crane being lifted can not occur on the rail car stuck or broken rope or fixed rope off phenomenon,lever hoist it requires a super electric hoist, underrun protection. Electric hoist overspeed protection is also necessary, when the electric hoist conical surface and the second brake brake brake surface wear or planar grid voltage fluctuation, set in the high-speed shaft speed sensor will cut off the main power from the electric hoist to the protective effect.

Barriers to movement across the hoist way

About electric  rope hoist  lifting and durable method
         Electric hoist lifting hanging objects and run when improper methods. Electric hoist then make hanging objects swing accidents. Electric hoist lifting hanging objects, when the wire rope or chain tension should be parking, electric hoist according to the direction of the hook again to identify the hook shake while lifting workers should check whether hanging objects hanging in prison; electric hoist lifting is not too Meng, hanging objects from the obstacle when accelerating until after lifting speed;chain block electric hoist hanging objects runtime. Under the conditions allowed by the rigger hoist hanging objects in the rear help steady object and under the command of the rigger run around obstacles. Do not run electric hoist intermittent, long-distance running, it is best to send electricity long run as well.
      Features: Small size, light weight, easy operation, the chain is more resilient, and more rugged wear at work to ensure the safety. And the chain hoist is equipped with a chain bag, so that looks clean and tidy electric hoist, chain bag is also equipped with anti-rust oil,wire rope winch so when the electric chain hoist when not in use on the chain bag will not rust, extend the life of electric hoist.

In the steel plant in the crane inspection a few questions

At present, the steel plant are widely used in plant construction. Because of its short construction period, the construction process is relatively simple, low cost and other advantages, except for some special occasions, the steel plant is always preferred. And installation of reinforced concrete factory building cranes in different tests, steel crane inspection otherwise within the plant should pay attention to several issues.
    A vibration, noise, sound, easy to loose coupling
    Because steel plant vibration absorption effect is poor, crane operation, especially when running carts have a greater vibration and noise. Damping method is currently used in the crane rails and carts bearing rail beam diagonally into the rubber gasket between the pads.manual hoist These rubber pads can absorb vibration noise, but also regulate the level of rail carts levelness. However, this structure reduces the carts with the rail beam orbit coupling stiffness asked. In the crane truck operations, the rubber gasket compression and rebound the intermittent cause carts orbit coupling (eg orbit coupling plate, hook bolts, etc.) are more loose. In the inspection, found several inter-orbit coupling bolts loose carts or track hook bolts loose. Therefore, it is recommended to take the following measures when installing the track: (a) strictly control the height of the rubber gasket in the rail beam height difference between the larger, should be leveled using iron gaskets, rubber mat last; (2) on the bend hook bolt with a larger preload, compression rubber gaskets, increase joint stiffness, torque wrench should be used at the same time evenly distributed between rail fixing bolt preload; (3) using the double nut sturdy other more reliable anti- loose measure.
    Two lateral stiffness of the rail and the beam instability
    Steel plant bearing rail beam, the use of "I"-shaped self-contained steel surface, the rail beam itself fixed commonly used methods are as follows: the rail beam mounted on a steel column bracket on the lower edge of the beam plate with bolts and bracket connection, beam edge board through the plate and column connection. When the crane trolley or hanging objects swing longitudinally along the main beam, its large wheels to the rail through applying a lateral variation of the beam load; time if not enough lateral stiffness of the rail beam severe vibration occurred, or is not firmly fixed bearing rail beam and instability, the safe operation of the crane will be adversely affected. For some large span the rail beam, when the crane girder span in the rail when unloaded from the car, the brake will cause a greater bearing rail beam transverse vibrations. Currently crane rail beam inspection regulations Chengdui Cheng lateral stiffness is no clear standard requirements and the corresponding test methods, making inspection judgment difficult. Recommended test can be used when no load, the amount of 1.1 times the amount of load and load up under braking the car simply to authenticate the rail beam lateral stiffness.

    3 crane girder stiffness measurement
    Girder stiffness discrimination law traditionally used water level in the main beam span suspension ruler, ruler hanging under heavy preload, with the water level in the main beam were measured in the no-load and rated load corresponding cross tape readings, calculates Elastic deflection under the main beam main beam stiffness values ​​to determine eligibility. In fact, the main beam in the amount of reading under load, both actual elastic deformation of the main beam, as well as the rail beam deformation, cart wheel assembly space, car assembly ask gap, cart track and trolley track deformation, deformation  lift hoist  rope and so on. Plant for the installation of the concrete structure of the crane, the elastic deformation of the main beam other than said several larger, assembly gap and the track deformation is negligible; but the crane of steel plant, which the rail beam, in its amount of wheel load reduction will have a greater flexibility under torsion (measured about 2 ~ 3 mm), will be added to the crane girder deformation measurement values, resulting in large errors. Therefore, the conventional method to measure close to or exceeds the threshold value when the S/800 (S span of cranes), especially for the rail span crane beam span where a small tops should be considered under the rail resilient deflection of the beam . The following methods can be used to verify and then measured again: each of the two ends of the crane beam and the main beam span inside hanging in three scales, respectively,hoist equipment with heavy preload, with the water level were measured cranes at no load and rated load under The three gauge readings, and then calculate the amount set under the main beam deflection under actual elasticity values, l = H a (H1 + Day 2) / 2. Where day, H1, respectively, across the main beam, the left-side and right-side beam beam scale at no load and rated load down the reading difference.

Heavy machinery enterprises should seize the advantage to enhance competitiveness

   Although China currently has a good number of heavy machinery companies, however, have the international competitiveness of the company does not have much. How to seize the opportunity for transformation of China's industrialization,hoist and trolley to create advantages, and then formed the core competitiveness, is placed in each of a Chinese heavy machinery industry entrepreneurs face the important issue.
Reform and opening up, China mainly university graduates represented a serious lack of intellectual talent, had not much technical content to labor-intensive industries to stimulate the economy to take off. With a low factor costs (including land, raw materials, energy, labor, etc.), the cost of environmental overdraft, creating a low-cost manufacturing advantage, the Chinese enterprises in the international conquering.wire rope winch Today, the low factor costs are long gone, people's awareness of environmental protection has become increasingly intense, low-cost manufacturing advantage can not be sustained. Meanwhile, China's personnel structure has undergone enormous changes in the number of university graduates hit record highs in 2008 reached 559 million, ranking first in the world, the employment pressure is very large, students also have a downward trend in wages; contrast, common workers because of labor-intensive industries and the relative lack of over-development in recent years, "labor shortage" is proof.
Face of the above economic background, Chinese heavy industry how the transfer of dominant elements gain new competitive advantage? We believe that Chinese companies are very heavy machinery necessary to fully utilize surplus and cheap Chinese college students the opportunity to research and development, services, marketing and other aspects of to build the core strengths achieved by the low-cost manufacturing to low-cost R & D and service transformation. Low-cost R & D and service opening times, marking the Chinese companies rely on technology, performance and service competition era.
    Heavy machinery industry is technology-intensive, labor-intensive and capital-intensive industry, compared with developed countries, China has the technical and financial advantages,manual hoist tend to have a strong competitive edge, however, compared with developed countries, China does not have the financial advantage, if only relying on manufacturing labor cost advantages, Chinese enterprises can only occupy the low-end market, it is difficult to win the competition, so technological innovation and related services for Chinese enterprises to go global key.
As long as Chinese enterprises to seize the opportunity to transfer Chinese elements advantages, make full use of the advantages of low-cost R & D and services, and increase efforts to develop technology, improve service levels, create a genuine core competitiveness,rope hoist the future can become internationally competitive heavy machinery enterprises.

Electric wire rope hoist trends

(1)  wire rope hoist  series is designed to rationalize. Recommended parameters: Capacity from 0.25-80t, lifting height 6-63m, with fewer base model covering the entire series. Lifting speed diversification Recommended values: single speed 8m/min, 10m/rain, 12.5m/min; dual-speed 1/10, 1/3, 1/4 ratio change. Two-speed programs should take picture machine, double pole windings and variable frequency conversion stepless speed or technique.
(2) structure should be able to meet a variety of working conditions such as: low headroom, twin-lift and other mounting methods; can be remotely controlled, insulated, corrosion proof, high temperature heat, explosion and other features of the product.
(3) designed to change the traditional round shape design with a square structure, the modular design, increasing the versatility of components, from the original arrangement of the motor of an intermediate shaft in the form of a gear of the rolls, instead of motor- reducer a roll arrangement, not only conducive to effectively improve the wire rope electric  lift hoist  lifting height, and avoid high-speed shaft axis drive, can improve the smooth running and reliability, reduce manufacturing costs.
(4) using high-quality high-strength steel wire rope, according to GB3811-1983 standard requirements, to meet the tensile strength safety factor under the premise of minimizing the wire diameter, roll diameter compatible with the rope diameter ratio of the diameter of wire rope and pulley diameter ratio, in order to facilitate the whole structure and reduced weight.
(5) Optimized gear designed to enhance the carrying capacity of the gear. Gear can be 40Cr or 42CrMn, 40MnB material, quenched and hardened or nitrided, the original material used 20CrMnTi or 20MnTiB Although the flexural strength of the gear and the contact strength than ideal, but affected by domestic processing level based, gear low precision, carburizing quenching deformation difficult to control, after the sequence nor grinding process, it is inevitable there is gear noise, low efficiency. New materials and heat treatment method has many domestic manufacturers to promote.
(6) electric wire rope hoist motor using 2,4,6-pole conical rotor motor for a variety of different conditions.hoist equipment Motor insulation class F class and should be raised to 11, protection class increased to IP54; motor overheat protection device settings; motor should be designed effectively improve the useful power, buck ability and starting and braking capabilities; improve motor design temperature, give full play to the potential of the motor; motor noise in addition to the design, processing, manufacturing to improve accuracy, it should also be considered from the design to reduce electromagnetic noise and wind noise channel eddy current measures.
(7) increased electrical protection measures, in addition to the upper and lower limit protection, it should also increase the overload protection (individual cases considered underrun protection); wrong phase, phase, voltage protection; hook retaining rope protection. Development of multi-function models such as brake: Dual brake (brake wheel motor brake + high cone axis compensation braking); three brake (brake wheel brake cone axis compensation brake + + high volume cylinder safety gates). According to user needs increased lifting height, load digital display.
(8) wire rope hoist high wear resistance, high strength rope guide rope guide materials and equipment performance has been the lead rope hoist many domestic enterprises to explore the subject, at present, China has mastered the part of the successful experience.
(9) Other components such as wire rope hoist hooks, trolleys and other design into groups to consider and versatility.
(10) to improve matching pieces such as wire rope, bearings and other standard parts quality.
(11) wire  rope hoist  raise contactors, transformers and other electrical control components of the mechanical life and electrical life, electric control box shape design plug body should consider coordinating with gourds.
(12) wire rope hoist focus on machine paints, packaging appearance quality.

Safe and correct operation of lifting tackle

Lifting tackle is an important tool for lifting his simple structure, easy to use, able to hoist and trolley  and block group number changes the direction of pulling and lifting or moving operation, especially by the coalition pulley pulley block with winches , mast or other lifting machines, widely used in the construction and installation operations.

Here are some safety when using tackle technical requirements:
(1), before use of new tackle from 1.25 times the rated load test.
(2) prior to use to identify pulley nominal weight, are not allowed from load can not be identified look-up table.
(3) Check tackle each part is intact, assembling any problems, defects, if any, is strictly prohibited.
(4), using a wire diameter must meet the requirements,hoist equipment rope and the pulley groove angle of not more than 40 to 60.
(5), large changes in the direction of the force of local and high-altitude operations, not to use the hook-type pulley, pulley-type rings should be chosen to prevent decoupling, as with a hook type, must be sealed with a lead wire.
(6), during use, coping pulleys, shafts regularly lubricating and reduce bearing wear.
(7), in the upper pulley disassembly is prohibited when thrown from a height,manual hoist to prevent injuries and damage to the pulley.
(8), the openings must first tackle the process of using active board properly to prevent rope pop wounding.