It is necessary to control the quality of hoisting belt from three aspects

The quality of hoisting products is directly related to the lives of workers, so no matter what products are in the production process, we must do a good job in quality control. Here, Chenli will introduce the three aspects that should be taken into account in the quality requirements of lifting belts.
First of all, the quality of tape material and weaving. General belts are woven from continuous fibers such as poly (acyl ester), polyester and polypropylene. The belt shall be free from any obvious defects during weaving. The fabric shall be made of the same material. The standard width of the belt is 25mm, 35mm, 50mm, 75mm, 100mm, 150mm, 200mm, 300mm. The allowable deviation is ± 10% when the bandwidth is ≤ 100mm; When the bandwidth is greater than 100mm, the allowable deviation is ± 8%. The belt thickness shall be uniform. When the sling is composed of multiple belts, the thickness of each belt shall be the same. The colorant, coating and covering of the sling shall be non-toxic and harmless.
Secondly, the sewing of sling. The seam shall be sewn with high-quality thread of the same material as the belt, and the seam shall be flat. When sewing, the suture shall have a distance from the edge of the belt width. For the belt with a thickness of no more than 10mm, 2-4mm shall be reserved for no sewing; The band with thickness greater than 10mm shall be reserved for 4-8mm without stitching. The suture shall have "back stitch" treatment at the end, and the "back stitch" length shall not be less than 25mm.
Finally, the end piece is prepared. It is a metal part installed on the sling soft ring. It is required that the inner diameter of the matching sling soft ring shall not be less than 2.5 times the diameter of the end part. The breaking strength of the metal material of the end piece shall not be less than 4 times of the ultimate working load of the sling. Cast parts are not allowed for end pieces.
The above are the three aspects to control the quality of lifting belts. In addition, Chenli company also introduced the common wear and damage of lifting belts:
1. Deformation and wear. The impact damage of wire rope surface caused by vibration and collision is a local wear phenomenon. If the steel wire rope on the drum surface is impacted by other objects, the lifting steel wire rope is intertwined with each other, or the rope biting phenomenon occurs due to the deflection of the pulley and the drum center, the steel wire rope will be deformed and worn.
2. Internal wear. In the process of use, due to the bending of the steel wire rope, the interaction between the internal thin wires will slip, the contact stress between the strands will increase, and the steel wires between adjacent strands will have local indentation deep pits. When repeated cyclic stretching and bending, the stress concentration will occur at the deep pits and break, forming internal wear.
In addition to knowing the common wear and damage of lifting belts, targeted prevention and treatment can be carried out. For example, if conditions permit, the diameter of the drum and pulley shall be increased as much as possible, and the hoisting belt with good structure and sharp edges and corners shall be selected as much as possible to ensure the safety of operation and prolong the service life.