The rope end should be fixed firmly and reliably. There are usually 4 ways to fix the rope end of the wire rope: the pressure plate for fixing the rope end is firmly pressed on the two ropes at the same time, and the nut has an anti-loosening device. When pressing joints with metal, there should be no cracks in the joints. When using a wedge, it should not be loose, and the wedge sleeve should not have cracks. When using rope clamps, the installation direction of the rope clamps must be correct, and the rope clamp pressure plate should be pressed on the stressed rope (long rope, not the rope head), and the number and distance should meet the requirements.
The ratio of drum diameter to wire rope diameter shall not be less than 14. Multi-layer winding drums should have a flange that is twice the diameter of the outermost wire rope. The drum rotation should be flexible, and the drum wall should not have cracks or excessive wear. The fixing device at the end of the wire rope on the drum should have the functions of anti-loosening and self-locking.
In order to ensure the safety of the lifting operation, at least two turns of the wire rope should be kept on the drum of the crane as the number of safety turns during work. The method of inspection is: put the hook at the lowest point (usually the ground), and check the number of safety circles, which does not include the number of circles fixed at the end of the wire rope.
The pulley should be equipped with a device to prevent the wire rope from falling out of the groove, and the gap between the rope retaining device and the pulley should not be greater than one-third of the diameter of the wire rope. It can be checked visually and, if necessary, can be measured with a steel ruler or calipers.
The pulley is mainly used to change the direction of movement of the wire rope. First check whether the winding sequence of the wire rope between the pulleys is correct, and at the same time, check the lubrication and rotation of each pulley.
The wire rope of the crane should be well lubricated and must not rub against metal parts. There must be no kinks, flattening, bending, broken strands, cage distortion, broken cores, etc. The reduction in wire rope diameter shall not be greater than 7%, which can be checked with a caliper. The number of broken wires of the wire rope cannot exceed the standard.
Post time: May-19-2023