The length of the lifting chain is adjusted according to the lifting height of the lifting object. Therefore, measuring the accuracy of the lifting chain also requires certain methods and skills. In the first step, the chain must be cleaned before the measurement; in the second step, the chain to be tested should be surrounded by two sprockets, and the upper and lower sides of the chain to be tested should be supported; in the third step, the lifting chain before the measurement should be ㄧ Stay for 1 min under the minimum ultimate tensile load; Step 4, when measuring, apply the specified measurement load on the chain to make the upper and lower chains tensioned. The chain and the sprocket should ensure normal meshing; Step 5, Measure the center distance between the two sprockets.
The following is an introduction to the method of measuring chain elongation: 1. In order to remove the clearance of the entire chain, it is necessary to measure under a certain degree of pulling tension on the chain; 2. When measuring, in order to minimize the error, in 6-10 knots (link) measurement; 3. Measure the inner l1 and outer l2 dimensions between the rollers of the number of pitches to find the judgment size l=(l1+l2)/2; 4. Find the elongation length of the chain, This value is in contrast with the use limit value of chain elongation in the preceding paragraph (chain elongation=judgment size-reference length/reference length*100%, reference length=chain pitch*number of knots).