Roller chain drive is widely used in the transportation of various industries. Because of its good transmission capacity, it has become an indispensable link in the production line. When the roller chain fails, it will seriously affect the running function. We need to find out the reason in time and deal with it in a targeted manner. The failure of the chain drive is mainly manifested as the failure of the chain. The failure modes of the chain are mainly as follows.
1. Fatigue damage of the chain
When the chain is driven, because the tension of the chain on the loose side and the tight side is different, the chain works in a state of alternating tensile stress. After a certain number of stress cycles, the chain element will be damaged due to insufficient fatigue strength, the chain plate will undergo fatigue fracture, or the sleeve and roller surface will appear fatigue pitting. In a well-lubricated chain drive, the fatigue strength determines the main factor of the chain drive capacity.
2. Wear of chain hinges
When the chain is driven, the pin shaft and the sleeve have a relatively high pressure and rotate relative to each other, which causes the hinge to wear and the actual pitch of the chain becomes longer (the actual pitch of the inner and outer links refers to the adjacent two The center distance between the rollers, it varies with the wear conditions in use).
After the hinge is worn, since the increase in the actual pitch mainly occurs in the outer link, the actual pitch of the inner link is almost unaffected by wear and remains unchanged, thus increasing the unevenness of the actual pitch of each link, making the transmission more unstable.
When the actual pitch of the chain is stretched to a certain level due to wear, the meshing of the chain and the gear teeth becomes worse, and the phenomenon of climbing and jumping teeth occurs. Abrasion is the main failure form of poorly lubricated open chain drive, which greatly reduces the life of the chain drive.
3. Gluing of chain hinges
At high speed and heavy load, it is difficult to form a lubricating oil film between the contact surface of the pin and the sleeve. Direct metal contact leads to gluing, which limits the limit speed of the chain drive.
4. The chain breaks due to impact
For chain drives with large loose edges and sag due to poor tension, the huge impact generated during repeated starting, braking or reversing will make the pins, sleeves, rollers and other components less fatigued. It will be broken by impact.
5. The chain is broken due to overload
The low-speed and heavy-duty chain drive is broken due to insufficient static strength when overloaded.
Doing a good job in the maintenance of the roller chain at ordinary times can reduce the probability of the above failure modes and greatly extend the service life of the chain. If you want to know more about roller chains after reading the above, please contact us for a comprehensive solution.
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