How to choose a sling?

* : * : admin * : 2018-08-20 9:58:00 * : 85

中China's sling industry is developing rapidly, but the technical standards are very imperfect. Because the enterprises are free to produce, the rings even reduce the safety factor without authorization. Therefore, the safety of hoisting in China has great hidden dangers, although the relevant standards are gradually improving, but they cannot Deny the problems with the rigging in terms of security.
Personnel working in the lifting industry should know the slings. The slings are mainly composed of metal slings and synthetic slings. Metal slings mainly include wire rope slings, chain slings, sling slings, etc.; synthetic fiber slings mainly include ropes and belt slings, and ropes are divided into nylon, polypropylene, polyester, High strength and high modulus polyethylene fiber.
So how do you understand the slings, cables, and slings in the slings? So the name thinks that the hoist represents the hoisting, the cable represents the connection, and the representative represents the tool, that is, the hoisting function is a tool that is connected together. Here are some tips on how to choose the right sling.

First: choose the sling from the concept

The steel wire rope is made of steel wire rope as raw material, mainly including phosphating coated steel wire rope, galvanized steel wire rope and smooth steel wire rope. It is used for lifting, pulling, tensioning and carrying ropes. It has high specific strength and light weight. It is widely used in steel, chemical, transportation, port and other industries due to its stable work and the difficulty of sudden breakage.
The chain rigging is a rigging made of metal chain links. According to its formation, there are mainly two kinds of welding and assembly. According to its structure, single and multiple, etc., high-quality alloy steel is used, and its outstanding features are wear resistance and resistance. High temperature, low ductility, no elongation after being stressed. It has a long service life and is easy to bend. It is suitable for large-scale and frequent use. Flexible and multi-limb, multiple combinations can improve work efficiency, reduce costs and so on.
The rigging set rigging consists of a main sling, a link shackle, a sling, a metal end assembly, and the main hoist includes a long sling, a round sling, a combination sling, and the like. The connection shackle includes a bow shackle, a chain shackle, etc. The sling belt includes a flat belt and a circular belt, and the metal end includes various hooks and other metal parts. The sling rigging can be freely optimized according to customer requirements.

Second: choose the sling from the precautions

Wire rope hoisting Note: For a one-leg sling, the hanging point must be vertically above the center of gravity of the object to be lifted. If the legs are hoisted, the hanging points should be on both sides of the cargo, and the hooks are above the center of gravity of the object to be lifted. If it is hoisted for three legs or four legs, the hanging point must be symmetrical on the plane around the cargo, and the hook is located directly above the center of gravity of the object to be lifted, and the sling is hoisted. Note: Please pay attention to the angle between the use and the use. If the hoisting belt used in the complete rigging is damaged, it cannot be used to avoid impact or vibration of the load. The safety factor is 4:1, and the specific one is 5:1 or 6:1, which is used within the safety factor range.

Chain rigging hoisting attention: The chain is not allowed to be knotted or twisted during use. The hook tip load cannot be used. The chain rigging has a normal working temperature of -40 degrees to +200 degrees. The single leg rigging should be vertically above the center of gravity of the lifting object. 5, 3 If it is a two-legged rigging, the hanging point should be on both sides of the lifting object, and the lifting point is above the center of gravity. If it is a three-legged and four-legged rigging, the hanging point should be evenly located at the center of gravity of the lifting object. And above the center of gravity of the object to be lifted.

previous item: Sling industry development status