Appearance inspection of chain:

1. Whether the inner/outer chain piece is deformed, cracked or eroded

2. Whether the pin is deformed or rotated or eroded

3. Whether the roller is cracked or damaged. Excessive wear

4. Whether the joint is loose and deformed

5. Is there any abnormal sound or abnormal vibration during operation,Is the chain lubrication in good condition

Inspection method:

The chain length accuracy shall be measured according to the following requirements

1. The chain is cleaned before measurement

2. Enclose the tested chain on the two sprockets, and the upper and lower sides of the tested chain should be supported

3. The chain before measurement shall stay for 1min under the condition of applying one-third of the minimum ultimate tensile load.

4. When measuring, apply the specified measuring load on the chain to tension the chain on the upper and lower sides. The chain and the sprocket shall ensure normal engagement.

5. Measure the center distance between the two sprockets

Measuring chain elongation:

1. In order to remove the play of the whole chain, it should be measured under the condition of applying a certain degree of pulling tension on the chain

2. When measuring, in order to minimize errors, measure in 6-10 sections (link)

3. Measure the size of the inner side L1 and the outer side L2 between the rollers of the number of nodes to find the judgment size L =(L1 L2)/2

4. Find the elongation length of the chain, which is compared with the use limit value of chain elongation in the preceding item.Chain elongation = judging dimension-reference length/reference length * 100%Reference length = chain pitch * number of links

Structure:

Consists of inner and outer links. It is also composed of the inner chain plate, the outer chain plate, the pin shaft, the sleeve, the roller five small parts, the chain depends on the pros and cons of the pin shaft and the sleeve.

Precautions

The chain is set to the state where the smallest wheel is set to the smallest wheel before the chain is set. In this way, the chain is relatively loose and easy to operate, and it is not easy to "bounce" after being cut off ".

After the chain is cleaned and refueled, slowly reverse the tooth plate, and the chain links coming out of the back dial should be able to be straightened. If some chain links still maintain a certain angle, it means that its movement is not smooth and it is a dead knot and should be adjusted. Found that there is damage to the chain must be timely replacement, maintenance of shimano chain recommendations strictly distinguish between the three types of pins and the use of connecting pins.

Pay attention to leveling when using the chain striker, so it is not easy to skew the thimble. Careful use of tools can not only protect the tools, but also achieve good results. Otherwise, the tools are easy to be damaged, and the damaged tools are more likely to damage the parts. That is a vicious circle.