In cranes using wire rope electric hoists as lifting equipment, in order to prevent the occurrence of tangled wire ropes, the drum of the electric hoist will be pulled out with left-hand or right-hand rope grooves according to the diameter of the wire rope. At present, the common measure to prevent the "Fried Dough Twists" of steel wire rope is to replace ordinary steel wire rope with "non rotating steel wire rope". This type of steel wire rope is pre formed and processed into a shape within the rope before twisting, so the internal stress of the steel wire rope is low and it is not easy to twist or knot. However, a lot of practice has proved that when the lifting distance is super high (such as the height is more than 100 m), the non rotating steel wire rope can only delay the occurrence of "Fried Dough Twists" phenomenon of steel wire rope compared with ordinary steel wire rope, and cannot really solve the problem from the root.

From the above analysis, it can be concluded that the fundamental reason for the winding of steel wire rope is the internal force of its own rotation, which drives the lower hook to rotate. For ordinary wire rope electric hoists, in order to arrange the wire ropes neatly, the rope groove is indispensable. This means that the internal force of the wire rope rotation cannot be eliminated. To prevent the hook from rotating, structural improvements can only be made to prevent the wire rope from transmitting rotation to the upper surface of the hook, achieving the effect of keeping the hook stable when the wire rope rotates. The wire rope rotation device can well meet this requirement.

The structure of the steel wire rope rotating device is shown in Figure 1. The upper connecting shaft 1 and the sleeve 2 are connected by threads and locked together with a pin to form a whole. Similarly, after the lower connecting shaft 5 penetrates into the sleeve, it rotates and locks with the locking nut 3 inside the sleeve. In this way, the entire device is divided into upper and lower parts, which are connected by the thrust bearing 4 in the middle. The biggest feature of the device is that because of the existence of thrust bearing, the upper and lower parts can rotate independently, that is, when the upper connecting shaft rotates, the lower connecting shaft remains stationary, which just meets the requirements of solving the problem of "Fried Dough Twists" of wire rope