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Due to the widespread use of chain drives, manufacturers and users often experience friction in quality issues. How to identify the quality issues is the key to solving the problem. Therefore, this article analyzes and explores the common problems that occur during the use of chain drives, and proposes solutions for reference by chain manufacturers and users.

1、 Lubrication of chain drive

Proper lubrication is necessary for the proper maintenance of any chain transmission device. The wear and fatigue of the chain, the wear and corrosion of the sprocket, the inflexibility of the chain links or the tightness of the hinges are all related to lubrication. If the chain wears quickly, the pin changes color, and the operation is not smooth, it indicates insufficient lubrication of the chain. Under normal circumstances, it is recommended to use the following lubricants: grade 20 petroleum for temperatures between 200-400C, grade 30 petroleum for temperatures between 400-1000C, grade 40 petroleum for temperatures between 1000-1200C, and grade 50 petroleum for temperatures between 1200-1400C. The lubrication method can be manual. Brush or oil pot oil supply lubrication. Chains that require a casing in the environment should be lubricated with light oil or drip oil. If the working temperature exceeds 3000C and cannot be lubricated with petroleum, a solution of colloidal graphite dispersed in carbon tetrachloride or white coal oil can be more effective.

2、 Faults and troubleshooting methods in chain transmission

1. Parallelism of front and rear axles and coplanarity of sprocket

In terms of wear life, the performance of a chain largely depends on the correct installation of the front and rear axles and sprockets. The requirement is that the parallelism of the front and rear axles should be within 1/300. The coplanarity of front and rear wheels is 0.5-1.0mm/m. If the above problems are found during the operation of the chain, they should be adjusted in a timely manner.

2. Chain tension

The tension of the chain is related to the sagging distance of the loose edge of the chain. For horizontal and inclined transmission with adjustable center distance, the sag of the loose edge of the chain should be 2% of the center distance. When the centerline is vertically transmitted or subjected to vibration loads, reverse transmission should make the chain more tensioned.

3. Chain and sprocket matching

If the chain and sprocket do not fit well, it may be due to the wear of the chain hinge and the elongation of the pitch. If there is tooth jumping, the chain should be replaced in a timely manner. If the sprocket is worn, it should also be replaced to avoid damaging the new chain.

4. Chain shaking

The reason for chain shaking is that the chain is too loose, the load is too large, or one or more chain links are not flexible. The solution is to install a chain tensioning device or adjustable center distance. Reduce the load if possible.

5. Excessive noise during chain operation

The reason for excessive noise is that the sprocket is not coplanar; Chain tension too large or too small; Insufficient lubrication; Chain and sprocket wear; Or the chain pitch size is too large. The solution is to check the parallelism of the front and rear axles and the coplanarity of the sprocket and correct it. Adjust the center distance and tensioning device to obtain appropriate tightness and ensure lubrication on the workpiece.

6. Chain plate side grinding

If the inner surface of the inner link plate is severely worn, it indicates that the transmission is not aligned. The solution is to check the alignment of the shaft and sprocket. If there are no problems with the installation, it can be observed whether there is insufficient rigidity due to excessive load deformation during operation.

7. Chain plate fatigue

When the load exceeds the fatigue limit of the chain plate, the chain plate undergoes fatigue failure, generating small cracks around the hole until fracture. The solution is to reduce the load or replace the chain with a high carrying capacity.

8. Pin shaft wear

Usually, pin wear is caused by insufficient lubrication. Regularly check if there are abrasives or changes in lubrication in the lubricating oil.

9. Pin shaft bonding

Pin sticking is generally caused by insufficient oil supply. If only one end is glued, it is necessary to check the installation of the shaft and sprocket, whether the shaft is parallel, whether the sprocket is coplanar, and whether the shaft and sprocket move during operation.

10. Sprocket teeth wear

If there is obvious wear on both sides of the sprocket teeth, it is a poor alignment of the transmission.

If there is a "bend groove" indicating excessive wear, the sprocket should be replaced, or the sprocket can be reversed so that the less worn side faces the chain. It is best to replace excessively worn sprockets together with the chain.

The above ten are common problems encountered during chain transmission. If the above issues are clarified, it will be beneficial for both chain manufacturers and users, reducing disputes between manufacturers and users, and promoting a more pleasant cooperation between them.

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