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 .

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 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.

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.

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.

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.

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.

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%.

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.

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.

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.

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.

PA mini electric hoist wire rope maintenance skills

1, wearing mini electric Manual hoist  rope pulley, there should be no rupture of its edges and gaps.
2, do not rope in motion relative to the friction and other objects, but should not be dragged steel edge oblique edges, so the edges cut steel wire rope.
     3, in the heat of objects using the rope must be used insulation measures, because after rope subjected to high temperature strength will be greatly reduced.
4, mini electric wire rope winch  during use must always check the strength of their rope, at least six months to conduct a comprehensive inspection or do strength tests.
5, the process of using non-overload should not be affected by the impact force required in bundled or lifting objects, be careful not to make the rope fast mouth directly and objects in contact with sharp edges in place to pad their contact with woodblock , canvas, burlap or other packing material to prevent damage to the object's edges and corners of the mouth rope fast to produce equipment and life accidents.
6, micro  hoist equipment  rope storage, according to the above methods to clean the dirt on the ropes after the Shang Hao lubricants, and then coiled good, stored in a dry place, in order to board underneath the rope or sleepers.
7, in the course, with particular attention to prevent contact with the wire rope and welding wire. Because of hitting power, the rope will be damaged, affecting operations smoothly.
8, note that checks whether the fracture failure situations or need to exchange a new rope, mini electric hoist to ensure safe use.
9, electric hoist in the course, where there is not long enough, you must connect using shackles, wire rope head wear is strictly prohibited methods take a long thin wire rope lifting objects, in order to avoid the resulting shear forces.
10, mini electric hoist in use for some time, the rope must add oil to prevent rusting steel wire rope, wire rope to reduce friction between.

Mini electric hoist seven major feature

The use of mini electric rope hoist  most close to people's lives, generally divided into fixed and running style, can enhance the 1000 kg of cargo, especially for high-rise buildings to lift heavy items from downstairs. The following detailed description of your mini electric hoist seven major feature.

1 mini electric hoist design smart, easy to use.
(2) When the limit stopper baffle met, the lift will automatically stop the operation. .
3, such as wire rope reverse elevate,  lift hoist  motor will automatically stop working.
4 hoist hook design is divided into dynamic and static loading loading two states.
5 Household 220V power operation.
6 Plug the power cord is easy to use.
7  Wire rope winch  hook 360 ° rotation.

How to replace the two-speed electric hoist slip line

In cement and other building materials companies, two-speed electric  Rope hoist  widely used. Two-speed electric hoist mill site slip line faults have occurred, to overhaul the inconvenience. This paper introduces a simple and practical self-designed two-speed electric  wire rope winch  replacement slip line method.

More than two-speed electric manual hoist  mounted on the U-shaped track. For this characteristic, we track the cable arranged in the middle of the upper beam. Rope or cable using vertebral round, ends with a basket of flowers bolt. Slip ring for the two rings linked together, there is a certain margin in order to avoid cable scratch cards. Steering ring is connected to two ring bolts, freely. Put an end cap on the steering ring tightrope, leaving a good motor lead wire fixing rear rubber ring at the lower end of turn. Then one end of a plurality of slip rings to wear to the tightrope, then rubber line segment fixed at the lower end of the slip ring. Frontage motor, can rotate freely. After terminating the power supply. In the traction motor to turn to the center ring, pulling cable in a straight line or circular motion. Straight track above method may also be used.