three phase electric hoist pulley scrapped

Electric hoist crane pulley, metal casting, appear temporarily the following situation, should be scrapped:
three phase electric hoist  pulley
1) crack.
2) the wheel groove uneven wear loss reached 3mm.
3) wheel groove wall thickness wear up to 20% of the original wall thickness at.
4) because of wear of the wheel groove bottom diameter reduction of wire rope diameter 50%.
5) other damage of steel wire rope defect related issues.
Two, the ratio of electric hoist crane pulley diameter and the wire rope diameter shall be not less than the specified value.
Three, electric hoist crane pulley groove should be smooth, manual lever hoist no damage of steel wire rope defect driving.
Four, electric hoist wire rope pulley should prevent the device from the wheel slot.

How to prevent the cheap wire rope hoist is rust corrosion

There are a lot of cheap wire rope hoist  is made of metal parts, improper maintenance is easy to rust corrosion, thus affecting the whole life of the future use and therefore how to prevent rusting wire rope hoist is also a need for attention. 

1, wire rope hoist gearbox, anti-rust coating should contain barium petroleum sulfonate grease in the gear surface, and regularly check corroded and full protective film case. 

2, the part of the  monorail wire rope hoist   have been exposed surfaces and exposed machined surfaces and other corrosive threaded part, should smear grease or other calcium-based rust rust grease. 

3, the surface should be coated with anti-rust lubricant rope should wrap tarpaulin or plastic film in the non-operating conditions outside. 

4, the hook bearing grease to inject calcium-based rust to rust, and often checks. 

For rust corrosion has been the site, first with hardwood or bamboo pieces scrape rust re-oiled, such as the original film is damaged or deteriorated, the application of kerosene or gasoline to clean, apply a rust grease.‍

The basic classification of steel wire rope electric hoist

Part of monorail wire rope hoist are: motor, drive mechanism, the drum and a steel wire rope. The motor and the reel mutually different positions can be divided into four types.
(1) the electric hoist motor axis perpendicular to the drum axis with worm gearing, width of large size, heavy weight, low mechanical efficiency, processing more difficult. There is no manufacturers of this type of product.
(2) the motor axis parallel to the drum axis electric hoist, the wire rope electric hoist has the advantages of small size and length of the height. The disadvantage for large width, grouping, complex manufacturing and assembly. Orbital radius.
(3) the strong electric winch motor mounted on the inside of the drum, the utility model has the advantages of compact structure, small size. The main drawback for motor cooling condition is poor, packet difference, inspection, installation, motor maintenance inconvenience, power supply device complex.
(4) the electric hoist motor mounted on the outside of the drum, the advantages of good for grouping, high level of generalization, changing the lifting height is easy, convenient installation and maintenance. Its shortcomings: large size.