The safety management of slings has not been integrated into the normal channels. Management is extensive. At present, heavy-duty tensioners are directly used in the safety management of slings, and the country has not yet established a unified management standard, while the enterprise lacks a corresponding safety management system. The safety management of slings is in a loose state. For the use of the unit (enterprise), after the sling is put into use, which department to manage, the frequency of inspection, who to check, and which standards need to be repaired or scrapped, which can not be implemented. Therefore, it is impossible to find and eliminate the hidden danger of the sling in time, so some slings have a long-term "sick operation", and tensioner national standard direct sales until an accident occurs. Moreover, for the production plant or process, there is no fixed personnel management and fixed-point storage. Who uses it and throws it out after use, which greatly increases the chance of sling breakage. The production of slings is not standardized. At present, the slings used by enterprises are divided into two parts: factory production and enterprise homemade. The product quality of sling manufacturers is an important cause of accidents. Some sling manufacturers do not produce and check product tensioner prices according to national standards. For example, in 1999, a factory purchased eight round welded chains with a capacity of 10 tons, one of which suddenly broke during use. After inspection, the welded seam at the chain break was obviously welded and belonged to "three no" products, no certificate, no inspection mark and quality grade mark. Some companies are there.