Several common damage causes of stainless steel chain

As a common power transmission device, stainless steel chain reduces friction through hyperbolic arc "chain" design. It is used in places with large power and slow running speed. It has obvious advantages over belt transmission, such as tanks, pneumatic compressors, etc., but the transmission speed can not be too fast, because the flexibility of chain is not as good as belt transmission. However, stainless steel chains are especially suitable for corrosion-resistant, clean or demanding areas of some chemicals, as well as high and low temperature occasions.

Several common damage causes of stainless steel chain are analyzed

1. Wear and damage

In open drive or stainless steel chain with poor quality and poor material, wear is usually the primary damage method of stainless steel chain drive. After the stainless steel chain is worn, the chain link and the total length of the chain are extended. During meshing, the meshing point moves to the tooth top along the working edge of the tooth profile, resulting in tooth skipping or chain disconnection. Wear mainly occurs in the outer link. When the outer surface of the inner ball of the pin shaft and the sleeve is worn, the hinge gap increases, thus extending the outer link. The pitch of the inner chain link depends on the bus on the same side of the adjacent rollers. Because the outer surface of the inner circle of the roller and the sleeve are rarely worn, the inner chain link will hardly elongate. When the wear elongation of the stainless steel chain reaches 3%, the stainless steel chain will be damaged due to off chain. At this time, the elongation of the outer chain link can reach 6%. In order to advance the wear life of stainless steel chain, it is necessary to pay full attention to smoothness and restrict the useful circumferential force within the range of allowable working load.

2. Fatigue damage

Stainless steel chains with excellent smoothness and wear resistance are usually damaged due to fatigue damage. Because the stainless steel chain has tight edges and loose edges, the stainless steel chain parts are subjected to the alternating load of large and small. In each winding of the chain link, the stress state of the stainless steel chain is tension and zigzag, the stress state of the pin shaft is shear, kneading and zigzag, the roller receives kneading and impact, and the sleeve receives kneading, shear and impact. Under the effect of alternating load, the parts produce cracks - crack propagation, resulting in fatigue fracture. The impact times of stainless steel chain can be regarded as the stress cycle times of stainless steel chain parts. In practice, only the impact of the hinge during meshing is usually considered in each winding of the stainless steel chain, so the number of revolutions per minute of the stainless steel chain is regarded as the number of shocks per minute.

In order to advance the fatigue strength of the stainless steel chain, the manufacturer has selected various methods to strengthen the parts, such as chemical heat treatment to carburize the surface of the parts, stainless steel chain to adopt Sichuan extrusion hole to resist stress concentration, widening the waist width of the stainless steel chain to smooth the stress concentration of the hole, shot peening the parts, etc.

3. Damage of connection strength

During the application of the stainless steel chain, under the effect of working load, the joint between the outer stainless steel chain and the pin shaft and the joint between the inner stainless steel chain and the sleeve is loose, so that the eyelet of the stainless steel chain is worn and the stainless steel chain is damaged due to rapid elongation. The stainless steel chain will be damaged due to the loosening of the riveted part at the head of the stainless steel chain pin shaft, the detachment of the stainless steel chain, or the scattered chain links formed by the cutting of the split pin and the flying off of the snap spring.

4. Stainless steel chain gluing

When the speed transition of stainless steel chain is too high and smooth, the pin shaft and sleeve are scratched, stuck and can not be used.

5. Static tension fracture

At low speed and heavy load, the load peak exceeds the allowable breaking load, causing the stainless steel chain to break.

6. Others

Repeated starting of stainless steel chain, multiple break caused by braking and forward and reverse rotation, thinning of stainless steel chain due to side wear, or wear and plastic deformation of sprocket teeth, non coplanar sprocket device, etc. may cause damage to stainless steel chain.