The chain is generally a metal ring or ring, used more as mechanical transmission, traction. A chain of mechanical uploads used to block traffic passages (as in a street, river, or bay entrance).
Inspection of the chain's appearance:
1. Whether the inner/outer chain is deformed, cracked, embroidered and etched.
2. If the pin is deformed or rotated, it is embroidered.
3. Whether the rollers are cracked, damaged or excessively worn.
4. The connector is loose and deformed.
5. When running, there is no sound or abnormal vibration, the chain lubrication condition is good.
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