1、 When the explosion-proof chain electric hoist encounters the following situations, it should be scrapped. 

The explosion-proof chain electric hoist pulley made of metal casting should be scrapped if one of the following situations occurs.

1) Cracks.

2) The uneven wear and tear of the wheel groove reaches 3mm.

3) When the wall thickness of the wheel groove is worn to 20% of the original wall thickness.

4) Due to wear and tear, the diameter at the bottom of the wheel groove is reduced by up to 50% of the diameter of the steel wire rope.

5) Other defects such as related issues that damage the steel wire rope.

2、 Specified value

The ratio of the diameter of the explosion-proof chain electric hoist pulley to the diameter of the steel wire rope should not be less than the specified value.

3、 Pulley groove

The pulley groove of the explosion-proof chain electric hoist crane should be kept smooth and flat, and there should be no defects that damage the steel wire rope during operation.