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 .

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.

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.

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.

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.

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.

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 ℃

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.

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.

"Lifting equipment installation construction and acceptance norms"

 "Lifting equipment installation construction and acceptance norms" according to the National Planning Commission Comprehensive (1986) No. 450 requirements, the former Ministry of Machinery Industry editor. Specific revision by the mechanical installation engineering standards Dinge Zhan organization, Ministry of Machinery Industry Beijing Materials Handling Research, the China Construction Machinery Corporation to install mechanized company and manufacturer of  hoist equipment  and the use of key units jointly revised.
In the revision process, the revision of the original group conscientiously sum up the experience gained since the implementation specification; fully understand our lifting equipment manufacturing industry standardization and research; absorbed lifting equipment installation engineering new technologies, new materials and new processes.manual hoist In strict accordance with the Ministry of Construction revision of standards, standardized procedures, procedures and requirements, and finally the former Ministry of Machinery Industry in conjunction with the relevant departments to review the finalized.
This specification is divided into twelve chapters and four appendices, amendments to the main contents of the following areas:
1 in accordance with the situation of the crane manufacturing industry, revised the types of lifting equipment installation specifications scope, adding some new lifting equipment.
(2) amend the original specification of the 1970s, due to objective conditions, standardization is far from perfect.load chain Now lifting equipment manufacturing standards, mostly adopting international standards and foreign advanced technology selected equivalent standards. Therefore crane equipment installation specifications test items, technical requirements and parameters are larger changes, such as lifting equipment commissioning.
3 lifting equipment installation engineering need to check or review geometric precision, fully consider the case of lifting equipment factory, transportation and storage and other factors that may cause deformation, through research, surveys and all concerned triage and determined. So test items have a greater change.
4 lifting equipment installation commissioning from the device out of the box to play until the whole grid project acceptance. The commissioning of the installation works explicitly include load, static load and dynamic load test load test; and through these trials, lifting equipment required to measure the mid-span camber cantilever deflection and static stiffness. These tests and measurements for normal safe operation of  hoist equipment  are very important parameters; otherwise prone to persons or equipment accidents.
5 increase the lifting equipment on any precision detection methods, measurement tools and other necessary corrections appendix.
6 terms, terminology, shape and position tolerances, measurement units at the prevailing national standards and lifting equipment manufacturing industry regulations, there is greater changes.

For tight line with the ten-point instructions Precautions

1 Use only the tensioner is not broken,manual hoist the label can clearly demonstrate capability.
(2) can not overload use.
3 Do not use the ribbon knot.
4. Use, please try to keep the fabric away from sharp edges and corners,lever hoist from abrasion or cutting.
5 Avoid twisting, twisted arrangement tensioner.
6 Do not place objects on the tensioner, so as not cause injury.
7 Do not adjust tensioner used as load lifting.
8, estimated using the thickness of the wire,load chain with the corresponding specifications of the tightener.
9, in the mouth with a flat-type tightening should be fastened tight line pawl and ratchet pawl disengaged to prevent slipping.
10, found when using a slip line (escape line), should immediately stop using it and to take measures (such as the wire plus a pad material), once again clamped firmly clamp the wire is indeed only after continued use.

How to identify quality lifting chain?

At present there are 80,100 level lifting chain, buy  Rope hoist  ,  manual hoist  and other equipment, chain quality is essential, here tells you how to identify the lifting chain quality?

The most important is that  load chain  fastening, and most likely to occur where the phenomenon is not tight at the inclination of doors and windows, such as welding is not good, and a certain degree of strength to withstand the pressure occurs after fracture phenomena. So buy it, pay attention to whether the inclination of doors and windows are hand welded, if the manual welding, insulation and windows that can not reach the high standard anti-stress.
Lifting chain structure in different ways, its hardware accessories are also different, different ways to make doors and windows open tightness are very different, their prices are not the same. In general, if the selected hardware accessories imported brands, the price and quality is relatively higher. Of course, some brands may be somewhat less of small manufacturers in order to save cost and reduce the accessories, such as double-sided locking pieces should be, he may be changed to a single set of accessories.

Ensure the safety of electric hoist lifting the 4 major device

Rope hoist lifting hanging objects, when the wire rope or load 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, wire rope hoist  lifting, do not over-Meng, hanging objects from the obstacle when accelerating until after lifting speed, electric hoist lifting of hanging objects easily big high, generally over a secure channel up to 0.5m for the good things. In addition to the above considerations, the Shanghai workers to introduce you to the following to ensure safe lifting hoist four major devices:
       An electromagnetic brake: brake is unique design feature is that even at full load, when the power suddenly cut off, the brake immediately play a role.
       2, reverse phase protection: circuit design ensures that when the motor power phases and to avoid wrong connection, do not cause the motor burned.
       3, the band brake: the use of flexible steel clamping brake wheel braking torque generated.
       4, normally open brake,  rope hoist  in non-working condition, the brake in the disengaged state agencies under external loads can produce movement; bodies need exercise in working condition when you stop, you can apply the necessary force to friction brake combination.