What are the maintenance steps of the chain

Chains are generally metal links or rings, which are mostly used for mechanical transmission and traction. Chains used to obstruct traffic passages (such as in streets, rivers or harbor entrances), chains for mechanical transmission.

1. The chain includes four series: transmission chain; conveyor chain; drag chain; special professional chain

2. A series of links or rings, usually of metal: chains used to obstruct traffic passages (as in streets, rivers, or harbor entrances); chains for mechanical transmission;

3. Chains can be divided into short-pitch precision roller chains; short-pitch precision roller chains; curved plate roller chains for heavy-duty transmission; cement machinery chains, leaf chains; high-strength chains.

Chain maintenance steps

1. The sprocket should be installed on the shaft without skew and swing. In the same transmission assembly, the end faces of the two sprockets should be in the same plane. When the center distance of the sprocket is less than 0.5 meters, the allowable deviation is 1 mm; when the center distance of the sprocket is more than 0.5 meters, the allowable deviation is 2. mm. However, it is not allowed to have the phenomenon of friction on the tooth side of the sprocket. If the two wheels are offset too much, it is easy to cause off-chain and accelerated wear. Care must be taken to check and adjust the offset when changing sprockets.

2. The tightness of the chain should be appropriate. If it is too tight, the power consumption will be increased, and the bearing will be easily worn; if the chain is too loose, it will easily jump and come off the chain. The degree of tightness of the chain is: lift or press down from the middle of the chain, and the distance between the centers of the two sprockets is about 2-3cm.

3. The new chain is too long or stretched after use, making it difficult to adjust. You can remove the chain links depending on the situation, but it must be an even number. The chain link should pass through the back of the chain, the locking piece should be inserted outside, and the opening of the locking piece should face the opposite direction of rotation.

4. After the sprocket is severely worn, the new sprocket and chain should be replaced at the same time to ensure good meshing. A new chain or a new sprocket cannot be replaced alone. Otherwise, it will cause poor meshing and accelerate the wear of the new chain or new sprocket. After the tooth surface of the sprocket is worn to a certain extent, it should be turned over and used in time (referring to the sprocket used on the adjustable surface). to prolong the use time.

5. The old chain cannot be mixed with some new chains, otherwise it is easy to produce impact in the transmission and break the chain.

6. The chain should be filled with lubricating oil in time during work. Lubricating oil must enter the matching gap between the roller and the inner sleeve to improve working conditions and reduce wear.

7. When the machine is stored for a long time, the chain should be removed and cleaned with kerosene or diesel oil, and then coated with engine oil or butter and stored in a dry place to prevent corrosion.

Visual inspection of the chain

1. Whether the inner/outer chain is deformed, cracked, embroidered

2. Whether the pin is deformed or rotated, embroidered

3. Whether the roller is cracked, damaged or excessively worn

4. Is the joint loose and deformed?

5. Whether there is any abnormal sound or abnormal vibration during operation, and whether the chain lubrication is in good condition

Testing method

Chain length accuracy should be measured according to the following requirements:

1. The chain is cleaned before measurement

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

3. The chain before measurement should 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, so that the chains on the upper and lower sides are tensioned, and the chain and the sprocket should ensure normal toothing

5. Measure the center distance between the two sprockets

To measure chain elongation:

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

2. When measuring, in order to minimize the error, measure at 6-10 knots

3. Measure the inner L1 and outer L2 dimensions between the number of rollers to obtain the judgment size L=(L1+L2)/2

4. Find the elongation length of the chain. This value is compared with the use limit value of the chain elongation in the previous item.

Chain structure: composed of inner and outer links. It is composed of five small parts: inner chain plate, outer chain plate, pin shaft, sleeve, and roller. The quality of the chain depends on the pin shaft and sleeve.

Precautions

For cars with a rear derailleur, set the chain to the state of the smallest wheel pair and the smallest wheel before driving the chain, so that the chain is relatively loose and easy to operate, and it is not easy to "bounce" after it is cut off.

After the chain is cleaned and refueled, slowly turn the crankset upside down. The chain links coming out of the rear derailleur should be able to be straightened. If some chain links still maintain a certain angle, it means that its movement is not smooth, which is a dead knot and should be fixed. Adjustment. If any damaged links are found, they must be replaced in time. To maintain the chain, it is recommended to strictly distinguish between the three types of pins and use connecting pins.

Pay attention to the straightness when using the chain cutter, so that it is not easy to distort 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. It is a vicious circle.