Cranes usually short link chain (lifting chain) shape. It measures: d represents the diameter or size round iron; l represents the length of the inside of the section or call long; b represents the inside width. Material is generally made of steel material. Strength properties when specifying steel using only these two materials, in addition to the combination of ingredients chemically related, but also with mechanical treatment and heat treatment related. By the numerous trials, we learned that with the molten steel chain made of 80 lifting chain, when the diameter of up to 30cm when lifting chain maintenance, a chain of fine equal to the creator of the steel-making. Such as the chain diameter and then increase, it is to use more steel, as the result of steel to high temperature, while the expansion nor sensitive. Chain disadvantages. When the chain for cables is concerned, it has the disadvantage of following: overload and blow sensitivity greater elasticity is very small, while the situation is the sudden rupture produced. Since the chain friction phase of the Festival and the Festival office, a strong pattern. Due to the weight of the chain itself is very large, it can have a great inertia force lifting chain image, so when the speed winch mechanism is large, quite inappropriate. Application load and test load, the load can be divided into the following types. 1. Apply the load (or allowable load): this load of chain can often afford those. 2. Test load: this load of the whole chain during the test must bear the load. 3. The rupture load: Each chain shall be taken as a rupture test three sections, three-section test chain must be able to withstand the load. Tensile strength material we used a great relationship, but the minimum should be 35 kg / cm. In cross-section welding, usually 25-30% lower than the strength of the other throughout. 80 lifting chain itself has many ordinary chain do not have the capability of lifting chain, but in certain circumstances it is easy to mess, a situation occurs, before what we do, so as to ensure no status. 1. Check the chain before after cracks twist reaches the end of the place, any change in time. 2. When using the strict compliance with the operating precautions 80 chain, prohibiting some of the wrong operation overload, cable-stayed, etc. appear. 3. Use the sprocket should be coordinated with the lifting chain, or prone to the phenomenon of chain card chain 4. To complete the chain and sprocket fit to live, to avoid skidding. To ensure no condition lifting chain 80 during operation, we need to start from the details, and put an end to illegal operations, not only can guarantee the safety of the operator, and can also extend the life of the chain. Prices lifting chain, lifting chain, Tianjin, Hebei Chen force by the lifting chain sling Manufacturing Limited. Hebei chen sling Manufacturing Co., Ltd. (www.qzhon.com) strong, credible, in Baoding forestry machinery industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead chen sling into the brilliant and you work for a better future!