Electric hoist control box working conditions

Electric  rope hoist  in the control box by the cabinet, contactors, transformers and other components, according to user requests for different lengths of multi-conductor cables and flashlight door, each control box is equipped with electrical schematics, wiring terminals are consistent with the schematic clear numbers, user maintenance, wiring. The following detailed description of your electric hoist control box working conditions.

1 control box use less than altitude does not exceed 2,500 meters,
(2) the ambient air temperature is between -20 ℃ ~ +40 ℃.
3 air humidity of 90%,chain block while the monthly average minimum temperature is 25 ℃, and taking into account temperature changes on the surface of the product Cream;
4 workplaces should have no violent shaking and vibrations;
5 In the absence of explosive medium, the medium does not corrode metal and damage the insulation of gas and dust (including conductive dust);
6 In the absence of rain and snow (rain,load chain except the control box).

Factors affecting the quality of lifting chain

Lifting  hoist equipment  as an important accessory, chain hoist mass relation to the overall usage of the following lifting chain to introduce you to influence what factors?
1, lifting chain is divided into 80, 100, etc., the higher the level, the chain is relatively good quality
2, the same series of chain products, components and the materials according to the chain, the chain and the hinge attachment structure is divided varieties.
3, the chain selection of alloy steel, hardness, durability, safety coefficient is high, cast iron alloy is relatively poor quality.
4, lifting chain welding standards, purchase, pay attention to whether it is hand-welded chain, if the manual welding,load chain resistance to pressure the chain can not reach higher standards.
5, chain and monocyclic permanent elongation shall not exceed 5% of the original length
6, hanging chain permissible wear value must not exceed ring chain bar diameter or thickness of 10% of the aids.
7, the same species, according to the chain pitch, Rows,hoist and trolley ultimate tensile load chain width and the different divisions specifications.
Lifting chain in the field of lifting machinery is widely used as an accessory, I hope this article can help buyers identify the quality chain.

Electric wire rope hoist brake type

Under normal circumstances the hoist hoist brake mounted on the high speed shaft, and some brake is mounted on the low speed shaft or hoist drum, and its role is to prevent items falling off the shaft,hoist and trolley you can increase security, belonging to hoist the the mounting device is an integral part of the hoist, wire rope electric hoist in the following example, to introduce you to the type of brake.
Electric wire rope hoists are many types of brakes, the choice of a variety of factors need to be considered, because of the different use of the environment determines the electric hoist can adapt to the various components, can be used normally. If you choose incorrectly,manual hoist ranging from damage hoist machine, it caused heavy accidents.
Brake type selection, mainly based electric hoist standard requirements and the actual needs, determine the type of brake. Such as standards: hoisting mechanism, luffing mechanism must be set normally closed brake, walking or turning mechanism can be used normally closed brake.
Consider using environment and places, such as brake mounting there is enough space, the choice of block, arm band brake or disc brake,load chain space is limited value, can be used within the shoe or clamp disc brakes.

How to test the speed of the electric car

Electric sports car run a speed test on the track (beam) is not less than 2M together on the highlights of each given tag, when the electric sports car that is running to mark start time and run to another timing mark is terminated, repeated four times, respectively for speed average.
Electric  wire rope hoist  parked in the main beam span, and gradually add to the chorus of 1.25 times the rated load, load rises from the ground 100 - 2011MM, vacant 10min, after uninstall electric sports car open to the ends of the main beam and then check whether the main beam permanent deformation. Repeat three times, allowing Xuzhu Liang 1,2 times a little deformed, 3rd main beam should not produce permanent deformation. Test will open to cross-end electric sports car, check the main beam is indeed camber.
For electric hoist gantry crane electric  load chain  should also make stops at each girder cantilever effective at both ends, and gradually loaded to 1.25 times the rated load, load rises from the ground, floating 10MIN, electric sports car after uninstall legs open to the main beam at check the main beam in the presence or absence of permanent deformation.manual hoist Repeat three times, the first and second rounds to allow mutual understanding and a little deformed, 3rd main beam shall not produce permanent deformation.

Rotate the hook after treatment

      When rotating hook after hook wire rope kink,hoist equipment this time can no longer be landing hook, otherwise it is possible to make them a rope damaged by excessive force, may take the following approach:
       (A) in the weight lifting off the ground is not high and the machine performance permitting, you can use luffing way to put weight down, then put positive spin hook.
       (2) If the weight has been lifted high off the ground, you can only think of ways to close the surrounding buildings,load chain or other person crane hanging cage to spin positive hook.
       (3) In case of hook rotation, torque should release the rope, the specific method is: the hook into the ground wire to unlock the fixed end, in accordance with the hook rotation number m times the rope match n is the number of base k (as the case may increase or decrease), according to the wire rope strands twisted inverse direction,manual hoist turn the end of the rope release torque, then loaded on a fixed end. Will play a maximum elevation boom, hook ups and downs repeated several times to check the results, you can repeat the above steps until the hook stability.

Rotation causes the hook

   Causes rotation causes the crane hook internal and external factors.
       Hook rotating internal reasons but also its root causes.
       Lifting machinery (such as:wire rope winch electric hoists, chain hoists) rope used either type, size, grade, will be in force when torque is generated. Torque is due to the rope caused by manufacturing methods, first wire helically twisted together to form a stock, and then a few shares and spirally twisted together to form a rope. When the force, the wires and stocks will be straightened, but when lifting operations rope ends are fixed,load chain so that torque is formed inside the rope. Another source of torque is formed wire pitch in use for some time becomes long, so that it is fixed at the end of the case, the rope is unstressed will produce a torque, the torque the presence of a rotating hook assembly trend .
       On the other hand there are many external factors that lead directly hook rotation, such as lifting process of manpower hook external force such as the wind turning drivers operate heavy swinging hook and the instability that led to rotating hook,hoist and trolley hook for wear around the way resulting imbalance hook hook rotation.

Construction crane Safety Evaluation System Overview

In order to carry out scientific and accurate construction crane security rating, need to propose different devices risk assessment, monitoring and early warning accident prevention measures,manual block the establishment of construction crane safety evaluation system.
Construction crane safety evaluation system as follows:
Construction crane safety evaluation of all aspects of the device to which the design, manufacture, installation, use, alteration, repair, use, scrapped every stage. Safety Safety Assessment is divided into pre-evaluation, safety acceptance evaluation, safety evaluation and special safety evaluation four categories.
(A) safety pre-assessment is in construction crane design, production carried out before, the project aims to analyze and predict the presence of dangerous and harmful factors, the type and extent reasonably practicable,lift hoist the safety of proposed technical design and safety management advice. Safety purpose of the evaluation is to identify the pre-construction crane manufacturing process inherent hazards or potential hazards and harmful factors; been selected by the evaluation method to evaluate the risk of harm arising from the extent of the main conditions; relating to safety and quality control regulations, standards, and combined with the actual situation exists for the construction crane hazardous and harmful factors put forward corresponding countermeasures, measures;
      (2) evaluation of safety and acceptance in the construction crane manufacturing factory or installed and put into use before the end of the evaluation, designed by the construction crane operating conditions of testing, inspection, find the device officially running the risk may exist, harmful factors put forward reasonable and feasible reform program of security technologies and security management measures;
(3) safety evaluation for construction crane (eg: electric hoists, chain hoists) security status of the safety evaluation, designed to find the existence of dangerous and harmful factors that determine the extent to propose reasonable and feasible safety countermeasures and suggestions. Include the following: a comprehensive collection of information needed for the evaluation, the use of appropriate methods for safety assessment hazard identification, the security status given quantization parameter values; may cause significant consequences for accidents, with the corresponding mathematical model for accident simulation, forecasting the impact of extreme circumstances the scope of the accident the maximum loss, and the probability of an accident; the discovery of the hidden dangers, according to quantify the security status of parameter values, the priority of the rectification sort;
(4) special safety assessment is based on the requirements of government supervision and management department carried out, for security issues of special safety analysis and evaluation, such as registering at construction crane equipment evaluation and rectification when lifting device evaluation. Special safety evaluation generally is for a certain type of construction crane or safety devices exist dangerous and harmful factors of safety evaluation,load chain the purpose is to find the existence of dangerous and harmful factors that determine the extent of proposed safety measures and reasonable and feasible recommendations.
Construction crane safety evaluation reads as follows:
The basic contents of the safety assessment, including hazard identification and risk assessment in two parts. Hazard identification, including hazard identification and calculation of risk-free rate; risk evaluation, including identification of indicators and risk control. Safety assessment through risk identification and risk assessment. Objectively describe the degree of risk construction crane, guiding people to advance to take appropriate measures to reduce the risk of construction crane.

Electric chain hoist not distorted in the chain hoist hanging on the load

1, two-speed electric chain hoist installation need to install Winders
2, Connect the power cord to connect the power cord, the power must be cut off in advance. Meanwhile ground should be well grounded, otherwise the operator touching any part of the chain hoist or when, may feel a shock feeling.
3, lubricate chain hoist load chain, chain lubrication extent affect the load chain is an important factor in life. Timely and effective lubrication of the load chain, in order to ensure the effective life of the chain.
4, check the chain arrangement,load chain for multi-line chains, two-speed electric chain hoist, the hook should ensure that the next frame will not be overturned. If overturned, restore it to its normal state, to ensure the chain of weld arranged in rows. Do not twist the chain hoist hanging on the load.
5, check the operating voltage due to electric chain  lift hoist  factory, is based on a user-specified voltage or high voltage equipment, such as 230/460V, need to check the wiring and verify contentment supply voltage requirements. If not, please refer to the instruction sheet to be corrected in order to meet the required operating voltage requirements.
Two-speed electric chain hoist installation Tips:manual block Install two-speed hoist, if the voltage at inappropriate manipulation might be caused by severe electric chain hoist damage. In order to prevent this situation thrown, it is necessary to ensure that the necessary wiring meet power requirements.

Chain lever hoist chain maintenance how to proceed

Chain  lever hoist  chain can be improved lifting objects of different heights can adjust the length of the chain is essential for the crane, it is important to improve the extract unit operating efficiency crane crane operation to expand the range plays an important role in the ring chain lever  lift hoist  chain maintenance how to proceed, the following details for you.

1 sprocket mounted on the shaft should not skewed and swing. In the same drive sprocket assembly in two end should be in the same plane, the sprocket center distance of 0.5 meters, the tolerance chain of 1 mm center distance of 0.5 meters above, the allowable deviation of 2 mm. But not with friction sprocket side phenomenon, if two series move too prone to derailments and accelerated wear. Replacing the sprocket must be careful to check and adjust the offset.
(2) the tightness of the chain should be suitable, tight increase power consumption, bearing wear chain is too loose and easily beating off chains. The tightness of the chain: from the middle of the  load chain  lift or pressure, the two sprocket center distance of about 2% -3%.
3 or by the use of chain elongation after long, difficult to adjust, remove links to look at the situation, but must be an even number. Back through the chain link should the locking plate inserted on the outside, the opening of the lock piece to be rotated in the opposite direction towards the.
4 sprocket wear serious, it should also be replaced with new sprocket and a new chain, to ensure good engagement. Not just a single or a new replacement chain sprocket. Otherwise it will cause poor acceleration engaging new chain or a new sprocket wear. Sprocket tooth wear to a certain extent should be promptly turned over to use.
5 The old part of lifting chain with a new chain can not be mixed with, or easy to have an impact in the drive, pull off the chain.
6 Lifting chain timely to remember at work filling oil. The lubricants must enter roller and inner sleeve with the gap in order to improve working conditions in order to reduce wear and tear.

Electric hoist rope wear

In general, the rope is more commonly used in mechanical power transmission components of a flexible, in  Hoist equipment  with electric  lift hoist ,  hook together make up the transmission system, as the main part of the force, its specifications, load many as Yi consumable parts, and understanding the reasons causing the wear, it helps our routine maintenance, extend its life and reduce accidents. Wear is the most common injury rope phenomenon, generally divided into external wear, deformation wear and internal wear three kinds of circumstances, let's have introductions:

1, the external wear lubrication
Rope during use with pulley groove,load chain drum wall, hook and other surfaces in contact resulting in rope diameter will become thin, fine steel outer peripheral surface being polished, so bear the load of the wire cross-sectional area decreases, the load rope down . Wear a single week than the whole week actually wear more serious decline in its load caused abrasion than 30% higher for the week, so in the course of the week to keep the rope wear.
2, deformation wear
Wear is localized deformation wear a rope in the phenomenon, usually by vibration, collision and other causes. Such as wire rope on the drum by the impact, the process of lifting rope wrapped, knotted, or center of gravity caused by the bite rope pulley will cause deformation wear. Should be noted that during the operation to prevent this phenomenon, prolong life rope.
3, internal wear
Internal wear is the rope during operation, the different stocks friction between the wire, resulting in the case of an internal wire wear, usually with wire internal wear the number of shares, the degree of bending of wire rope, wire rope running speed, internally lubricated rope status.

Chain rigging, how to choose

 Chain rigging is made of metal chain and ring connection rigging, chain rigging are made of high quality alloy steel, it features a wear-resistant, high temperature, low ductility, the force will not stretch like. The following you simply describes how to select the chain rigging.
Chain rigging in accordance with its main form of welding and assembly of two types of single and multi-its structure just waiting. High-strength chain rigging can be divided into those levels: chain consists of 120 chain rigging, chain rigging 100 and 80 rigging and so on.
1,100-level  load chain  rigging temperatures up to 200 degrees = 100% of rated load, 200 degrees to 300 degrees = 90%, 300 degrees to 400 degrees = 75%
2,100 grade chain elongation rigging A minimum of 20%.
3,100-level chain rigging system will not be mistaken, because only chains and have the same level of accessories to each other.
4,100 level is super-type chain rigging chain rigging, compared with 80 chains, super model biggest advantage is the same diameter, the rated load is higher than 25%, which means that the same rated load , 100 whose diameter is smaller chain.
5,100-level  load chain  rigging surface has a higher hardness and better toughness. Chain links and attachments more wear.

The details of the safety design of electric hoist

Following is a brief introduction for you to hoist some of the security detail design:
1,  Wire rope hoist  pulley
        Should prevent the rope pulley bracket installation or structure, open the side panel and circular pulley cover the roof and other gaps in the pulley should not exceed certain death is twenty percent of the diameter of the pulley life can be touched, should be set off pulley housing, to prevent wire rope electric hoist rope and pulley cover out of the mouth and whispered friction rope rope failure should be in and out of the mouth and the rope rope rope friction gnawing failure rope should be in and out of the mouth guard with banana or plastic rope sets.
2, the  rope hoist  load chain
        Chain drive system should prevent the chain in the work place or jump to climb chain chain chain and sprocket to ensure smooth functioning correctly meshed measures; necessary, there should be pulled out to prevent the chain from the sprocket Oh also check the whole chain relaxation measures, reliable hardware installation and towline chain hotlinking protection devices should be able to prevent the chain from the sprocket protruding, to prevent the chain in use reverse.
Electric hoist chain ends of the link should be solid and reliable design chain fixtures, should enable it to maturity 2.5 is the name of the chain tension is not permanent deformation of the lifting chains fixtures, when the need should be able to pepper their fatigue strength.
Load side chain should not be Rato firmly assured, fixed the chain link bolts protective measures should, when necessary once again to further tighten the bolts.