The crane drum is a key component used for winding steel wire ropes in the lifting mechanism of a crane. It is used to lift and lower the load by retracting and releasing the steel wire rope to drive the pulley system and the lifting device. Here is a detailed introduction about it:
Structural composition: The drum group is mainly composed of a drum, a drum shaft, a gear disc (or large gear), a drum hub, a bearing body, and bearings.
Crane drum
Classification: According to the shape of the cylinder, it can be divided into long axis drum and short axis drum; According to the manufacturing method, it can be divided into cast drums and welded drums; According to whether there are rope grooves on the surface of the cylinder, it can be divided into smooth surface drum and spiral groove surface drum; According to the number of winding layers of the steel wire rope on the drum, it can be divided into single-layer winding drum and multi-layer winding drum.
Processing material: The material for processing the drum is generally gray cast iron not lower than HT200. If necessary, ZG25, ZG35 cast steel or Q235B, Q345B steel plate welding can be used. Casting drums are generally used for equipment with small lifting capacity, while steel plate welded drums are suitable for large tonnage and high-performance lifting machinery equipment.
The fixation of steel wire rope: usually fixed with pressure plate screws or wedges. The pressure plate fixing method is simple and reliable, easy to inspect, and suitable for single-layer winding drums; The wedge block fixing method is commonly used for smaller diameter steel wire ropes and is suitable for multi-layer winding drums. To ensure safety, when the retrieval device is lowered to the lower limit position, in addition to the fixed ring, 2-3 safety rings should be retained on the drum.