Chen chain force more stringent testing process, divided into hardness testing and tensile testing. Hardness testing mainly after heat treatment, lifting chain sling, sampling of the chain, lifting chain, with a hardness tester hardness testing, hardness herein refers to a Rockwell hardness. The hardness of the link arm section is 36-40 degrees, R Department (arc position) hardness of 40-46 degrees, if the hardness of failure, you need to adjust the heat treatment process immediately. If the hardness is qualified, it needs to be tensile testing. Rally test is destructive pull test that is the chain pull off with Rally facie breaking force and elongation values, the best test of the chain length of the lifting chain where 5 or 7 ring ring ring taken different specifications the number is not the same. If the failure is immediately process adjustment. Chain at the factory, but also the need for workers to pull a whole and the entire testing, workers pulling force of 2.5 times the rated load, Tianjin lifting chain, so the maximum to ensure the overall quality of the chain. Qualified products are subjected to a surface treatment for black and galvanized chain, after the surface treatment is completed, but also the need for random testing. All testing qualified, then allow the factory, the unqualified re-sampled. Correct lifting chain mounted not directly affect the quality of the chain of transmission and chain life, proper installation, lifting chain, to ensure safety when working to ensure the long-term use of lifting chain. Here some things to give you a brief talk at the installation lifting chain to note: 1. Two-axis parallel, two coplanar. 2. Connect the sprocket shaft and reliable. 3. does not allow too much tension. The chain and chain guard should maintain a certain gap. 5. No new or failure of the chain and sprocket badly worn supporting the installation. 6. The chain looping reliable, retainer open end and moving turn in the opposite direction. _ Tianjin lifting chain lifting chain manufacturer (Online) _ lifting chain sling from Hebei chen Manufacturing Limited. Hebei chen sling Manufacturing Co., Ltd. (www.qzhon.com) Hebei Baoding, forestry machinery leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Chen led force in a sling with the staff warmly welcome all inquiries negotiations to create chen sling a better future.