1. Sling is the general term for rigging and slings; slings refer to rigid devices used for lifting operations, including hooks, beams, c-shaped slings, clamps, shackles, vacuum suction cup slings, and magnetic slings With etc. Rigging refers to tying flexible components to lifting parts to bear the load, including wire ropes, chain rigging, hoisting belt rigging, etc.
2. The lifting safety management personnel collect the requirements of various departments and apply for the purchase of slings; the rigging must be inspected by the warehouse personnel and must have product quality certificate documents and work instructions; the factory-made mast should have at least test-verified documents , When necessary, there should be design drawings and production requirements; all rigging documents shall be archived by crane safety management personnel.
3. After the crane safety management personnel and equipment maintenance personnel store the rigging, they should determine the identification number of the rigging, and make a rigging identification plate with strong, wear-resistant, anti-corrosion, and self-locking functions; the identification plate should indicate the number, Capacity and security check validity period; in principle, the sign should be hung on the rigging that does not hinder operation and is not easily damaged. Especially small rigging, such as shackles, can be hung on the corresponding rack. The sling is checked regularly by maintenance personnel during use, and the safety check is valid for 6 months.
4. Before each use of the sling, the operator should check the content of the logo, conduct a comprehensive inspection and full-length inspection of the sling, and prevent use under unsafe conditions.
The ductility of the sling reduces the probability of breakage
The main material of the sling is metal, and the ductility of general metal is invisible to us. The ductility can help reduce the probability of sling breakage.
The sling is often not used alone when it is used. It is a combination of many complex structures. This requires us to consider the impact of force analysis on the ductility of the sling in mechanics. Of course, from this point, the sling should have a certain degree of ductility, because if it is suddenly stressed and has no tensile characteristics during lifting, the sling itself will bear excessive instantaneous tensile stress. This kind of tensile stress can easily exceed the ultimate stress that it can bear. And if there is a certain elastic pull, it will play a certain buffering effect when lifting, which can greatly reduce the probability of rigging breakage, especially for wire rope slings.
Everything is malleable, but the extension curve is different. The use of slings must ensure that the elastic stress range is not exceeded, that is to say, the hoisting must be within the range of the maximum stress that it can withstand, so as to ensure the hoisting safety.