Electric hoist prone to some common failures, before we have introduced, today mainly introduces the reducer oil leakage problem, in order to solve the problem, we must first find out the cause of the problem, the main reasons are the following three points:

1.Between the reducer box and the box cover, the sealing ring is poorly assembled or damaged, should be removed to repair or replace the sealing ring;

2.The reducer connection screw is not tightened, after the shutdown, should tighten the screw.

3.Electric machine sweep: motor shaft support ring wear serious, rotor core displacement, or for other reasons to make the stator core displacement, resulting in the motor conical rotor and stator gap is too small to sweep, the motor is strictly prohibited "sweep", when the sweep occurs, should remove the support ring for a change, adjust the gap between the stator rotor cone surface to make it uniform, or sent to the maintenance factory for repair. Through the analysis of the common faults and treatment of the electric hoist, the electric hoist maintenance personnel know where to start the inspection when dealing with the fault, improve the maintenance efficiency, in addition, but also for the operator to provide on-site methods to deal with the problem.

When installing the electric hoist, you must first choose the installation position. There are several factors to consider:

1. Position of power supply and controller

The electric hoist needs to be connected to the power supply and controller, so it should be selected in a position that is convenient to connect the power supply and controller.

2. Safety factors

The installation location should be away from flammable, explosive and toxic substances, and avoid installation in areas prone to disasters such as strong winds and earthquakes.

3.The transport distance of light and heavy objects

To determine the installation height and position of the electric hoist according to the distance and height of the light and heavy objects that need to be transported.

1.Each newly installed electric hoist, first of all should be idled several times.

2.Before normal use, should be carried out rated load and excess load of 10% dynamic load test, repeated lifting, check its transmission mechanism, electrical part and connection part is normal and reliable.

3.The static load test of 25% of the fixed load, lift the load from the ground about 100mm, suspended for 10 minutes, remove the load to check whether it is normal.

4.In use, it is prohibited to use in an environment that is not allowed to exceed the rated load.

5.It is not allowed to use inclined lifting and horizontal dragging tools, and it is not allowed to lift buried objects.

6.The limiter is to prevent the hook rise and fall beyond the limit position caused by the accident set device, so can not be used as a switch.

7.After the work is finished, pull the main switch of the power supply, cut off the main power supply.

8.Explosion-proof electric hoist should be operated by a special person, the operator should master the relevant explosion-proof operation procedures.

9.The explosion-proof electric hoist should be inspected by specialized personnel at least every ten days, and timely measures should be taken after problems are found, and carefully recorded.

10.Check the explosion-proof motor, explosion-proof control box, explosion-proof limit switch, explosion-proof button switch to remove the explosion-proof shell, first cut off the main power supply, carefully disassemble.

11.When disassembling, the flameproof surface should be strictly protected to prevent collision, resulting in bruises on the flameproof surface and resulting in explosion transmission. When the flameproof shell is cracked and breathable, and the flameproof surface is damaged, it will be scrapped. Install the flameproof shell and tighten each bolt, strictly prohibit loosening.

12.Each mechanism should operate smoothly, hook without jitter, reliable braking, braking slip S should meet the following requirements: S<=v>

13.The steel wire rope used at room temperature at least once a week lubrication, the use of adaptive tools (such as hard brush or smooth clean wood) grease evenly coated on the steel wire rope, winter temperature is low, the grease must be heated.

14.The shift should check whether the wire rope is bent, knotted, whether the rope is prominent or too twisted, whether the surface has signs of torsion, whether the rope strand and individual wire rope are broken, whether the end of the rope is firm, whether the wire rope is clean, whether the lubricating oil is enough.

15.When the explosion-proof electric hoist is working, it is strictly prohibited to suspend the load in the air for a long time to prevent the deformation of the parts.

16.In the use of the process, if found bad fault, should immediately cut off the main power supply.

17.When the explosion-proof electric hoist is used, it should be stopped at the designated location, and the hook should be raised to the position of more than 2M according to the ground.

18.Should ensure that the explosion-proof electric hoist has enough lubricating oil, to ensure that the lubricating oil is clean, should not contain impurities and dirt.

CD, MD type electric hoist is composed of three parts: lifting mechanism, operating mechanism and electric control.

1.Lifting mechanism The lifting mechanism is composed of four devices: drive, brake, transmission and winding. The driving and braking device is a squirrel cage conical brake motor, that is, the rotor and stator of the motor are conical structure, and the brake is also composed of conical brake ring and conical brake wheel. The lifting motor of MD hoist is double electric unit type, and the speed ratio is 1:10 through the gear reduction between the two motors. The transmission device is a four-stage cylindrical gear reducer; The taking device is composed of hook, wire rope, reel, etc.

The overall layout is that the drum is in the middle, one end is a conical brake motor, the other end is a reducer, and the motor shaft is connected with the reducer through the long shaft and the rubber coupling. The drum shell is cylindrical, and there are suspension rows and fixed shapes.

2.The operating mechanism is also known as the hoist car, by the drive, brake, transmission and wheel four devices, the driving brake device is a two-in-one squirrel cage cone brake motor, the brake is a flat brake; The drive gear reducer is an open and closed cylindrical gear drive, and the open gear low speed stage is composed of direct milling teeth on the wheel rim; The wheels are single-rim steel wheels with approximately conical treads.

The running car has manual, chain and electric points.

3.The electric control adopts two sets of standard magnetic starter, one set controls the positive and negative rotation of the lifting motor, that is, rise and fall; A set of control running motor positive and negative rotation, that is, left and right transverse. Operation control is the use of manual button, the operating voltage is 380V, in order to safety some have used a low voltage 36V, in order to prevent chaos, the drum is provided with a rope guide, the rope guide lateral movement with the lifting limit switch action, to control the lifting limit position.