Lifting sling is lifting, handling operations an important auxiliary tool, which includes wire slings, straps, hooks, steel clamp and so on. Sling with a wide variety of complex use of the environment, the use of large and uneven quality of personnel, risk factors,hoist and trolley and more, great harm. If used improperly or mismanagement, prone to accidents.
For some companies in recent years fracture accident occurred in a sling, combined with years of safety management practice, sling rupture causes a careful analysis, and proposed preventive measures to ensure the safe use of a sling.
1. Sling manufacturing irregularities
Currently, companies use the sling into professional factory production and business homemade two parts. Sling professional manufacturer of the product quality, but off is the cause of the accident is an important reason. Some sling manufacturers do not follow the national standard production and testing products. Such as: 1999 factory bought 8 rated load 10 tons of Circular Welded chain, which has a sudden break in use. After examination, the chain breaks open welding seam obvious, belonging to neither certification nor the inspection mark and quality grade mark of the "three no" products.
Some companies buy sling out, it is also full use of their existing equipment and human resources, their processing and the production of some number of single process is simple sling. Enterprise homemade sling, its randomness and blindness larger in the selection, to determine the size and production methods, often depending on their experience,chain block manufacturing quality and safety performance is difficult to achieve the requirements. Such as: a workshop in 2000 forged a two tons of small hooks, With no national standard DG series steel (using ordinary 45 # steel) manufacture, in use, the hook was straightened, hanging objects falling, almost led to casualties.
2. Sling using the low quality of personnel security technology, poor safety awareness
Sling using technical quality and safety of personnel security awareness is not strong, not only affects the quality of the lifting operation, but also directly related to the user's personal safety. Its performance are the following, first, use of personnel safety consciousness. In the production process, some sling use of personnel emphasis on production safety, to grab the progress, time duration, simplify operating procedures, or even illegal dangerous operations and stuffed hair accidents. Second, some of the safety technology used low quality, they do not understand the basic performance sling and use requirements, but do not know how to calculate the center of gravity and determining hanging objects hanging method, so that in the specific operation, arbitrary, can lifting safety can not be guaranteed, then completely rely on hit "Grand Canal."
3. Sling has not been included in the safety management of normal channels, extensive management
Currently, sling safety management, the State has not developed a standardized management standards, companies are lack of appropriate safety management system, resulting in a sling safety management in a loose state. On the use of units (enterprises) in terms of a sling into use, by what sector management, long test time and by whom checks,lever hoist to what standard to be repaired or scrapped, which are impossible to implement. Resulting not timely detect and eliminate hidden dangers exist sling, sling so that part of the long-term "sick running" until an accident. Furthermore, the production plant or process is concerned, no one managed to implement fixed, fixed storage. Who is who take, littering after use, which makes the sling greatly increased chance of breakage.
In addition, lifting the driver to improper operation, lifting up the stopper is caused sling failures and other fracture is an important reason.