The structure, types and safety requirements of crane drums

The drum is an important load-bearing component of the crane. It winds the wire rope through the action of the motor to achieve the descent or lifting of the hoisted object. It carries the lifting load, retracts and releases the wire rope, and realizes the lifting and lowering of the object-picking device. Therefore, the safety and reliability of the crane drum are very important. Types of crane drums
According to the shape of the drum, it can be divided into long-axis drums and short-axis drums. 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 drum, it can be divided into smooth and spiral grooved drums. According to the number of layers of wire rope wound on the drum, it can be divided into single-layer winding drums and multi-layer winding drums. Most general cranes use single-layer winding drums, and multi-layer winding drums are used for cranes with extremely large lifting heights or requiring compact structures (such as truck cranes).
The structure of the crane drum
The drum is composed of a drum, a connecting plate, a shaft, and a bearing bracket.
The surface of the single-layer winding drum is cut with spiral grooves with arc sections to increase the contact area between the wire rope and the drum, and to fix the winding position of the wire rope on the drum to avoid friction between adjacent wire ropes and affect the service life: The surface of the multi-layer winding drum is usually smooth without spiral grooves, and there are flanges at both ends of the drum to prevent the wire rope from slipping out. The disadvantage is that the wire ropes are arranged closely, and each layer overlaps and rubs against each other, which has a great impact on the service life of the wire rope.