Lifting chain inspection requirements

　　General chain testing includes the following three aspects:

　　(1) the amount of elongated chain. Chain pin and chain wear and chain elongation are chain length increases, the increase in the amount of wear and elongation is the result of two factors.

　　(2) the wear value of the chain piece. As the load center deviates from the center of the spreader, causing the chain to tilt, the friction between the chains, wear thinning, carrying capacity decreased, especially in the sprocket chain wear more serious.

　　(3) wear of the edge of the chain. The chain is scrolled on the sprocket, and the friction of the chain and sprocket causes the edge of the chain to wear more narrowly.

　　According to daily use, the main should be detected (1), (2) two aspects.

　　This is not the number of restrictions, but generally can be a value out of statistics, but this value can only be used as a reference, but not as a basis. The general lifting chain should be used before the test, lifting the chain of technical specifications will give the test requirements and basis, what state should be replaced chain. For example: the technical specifications require a length limit, when the lifting chain length exceeds or equal to the limit length should be updated when the chain.

　　Such as: 1 ton or 2 tons of the chain, the standard length is 264mm, the limit length is 269mm, when the chain length of more than 269mm must be replaced.