Gantry crane rope bite

bridge gantry crane wire rope bite injury phenomenon generally occurs in multilayer winding hoist drum, double grooved drum winding lifting worse.

Figure 5 shows a schematic view of the way around the reel can be seen, the first layer of wire rope grooves along the filled drum, the second layer wire and the neutral orientation angle β was, the lower wire rope can smoothly fall of neutral inside, but after a centerline of the roll and the pulley, wire into a loop of rope to the direction of the adjacent slot skew angle α, the α angle increases with the axial movement of rope.steel crane So into the rope around the whole circle is no longer able to regularly wound on the lower rope neutral, but every one week there is a crossing point of the winding can be called nodes. At the nodes around the rope into the rope is no longer a pressure on the lower deck, but the first has been wound on the drum adjacent a pressure ring. In the rope around the nodes of the moment, the pressure generated by the tension acting on the entire first surface adjacent rope, generally when the α angle is not significant, pressure area is small, wire rope often quickly from the surface of the adjacent grazed, fall into position. However, due to the very fine wire is wound into a wire, under pressure, between the wire and the wire embedded in each other both easy, and certainly to slip, resulting in a shearing motion.

Multilayer winding roll bite rope to eliminate the phenomenon is difficult, but it can take some measures to reduce the adverse effects caused by biting rope. For example: Select the right rope during the winding direction of the axial displacement, i.e.,sino hoist the first layer of wire rope grooves of the initial rotation, which is the second layer of wire rope produced great relationship bite. If the rope reel are arranged as shown in Figure 6, there is almost no angle α, will basically eliminate the bite rope phenomenon. According to statistics, the roll structure improved the life of each rope to extend 4 to 5 times. In addition, according to the entire wire rope on the drum under load conditions with variable cross-section roll. Sometimes we can be a number of laps before the roll rope used infrequently and can not lack the characteristics of certain ring rope presence this side of the winding drum layers, while the work force frequently overloaded single section winding, so not only eliminates the bite rope phenomenon, but also greatly improve the contact wire rope condition. With variable cross-section roll,overhead gantry crane rope life can be significantly extended. Multi-layer winding wire rope can also be taken on a regular basis truncated approach, that first consciously put new rope length 2 ~ 3 laps in length, according to the situation on a regular basis after the end of the rope clipped from the semi-circle, in essence, keep moving node, to avoid excessive damage rope at the nodes.