Oval head pin shaft for large-load chain

Abstract

The invention relates to an oval head pin shaft for a large-load chain. The oval head pin shaft comprises a pin shaft cap, a pin shaft column, an oval head and a spring pin hole. The pin shaft cap is a short cylinder. The two radial ends of the pin shaft cap are cut flatly to be rectangular. The pin shaft column is a cylinder and serves as a pin shaft body. The oval head is a section of oval column formed in the manner that the head of the pin shaft column protrudes out. The spring pin hole is formed in the minor diameter direction of the oval column and is a through hole into which a spring pin is inserted. The oval head pin shaft is mainly characterized in that the oval head is inserted into oval through holes of an outer chain plate and an inner chain plate, and the pin shaft is fixed in the manner that the spring pin is inserted into the spring pin hole. The oval head pin shaft is reasonable in design, and the pin shaft is effectively prevented from jumping in the through holes of the chain plates through the chain pin shaft with the oval head; the working stability of the chain is improved, abrasion of the chain plates to the pin shaft is avoided, and especially, stress concentration is effectively eliminated through the oval structure; and rotation of the pin shaft is avoided, and the service life of the chain is prolonged.

Description

technical field [0001] The invention belongs to the field of chains, in particular to an elliptical head pin shaft of a large-load chain. Background technique [0002] At present, in the large-load chain structure, the head of the pin shaft is circular. When installing and using, it is necessary to insert the round head of the pin shaft into the circular through hole of the chain plate and fix it. Because the large-load chain is working During the process, the pin shaft will rotate in the circular through hole. The rotation of the pin shaft will cause the chain plate to shear the pin shaft and cause the pin shaft to be damaged, which will affect the service life of the chain. Sometimes, in order to prevent the pin shaft from rotating, the pin shaft The arc of the head is symmetrically cut flat, but this will cause stress concentration at the corner where the arc and the plane meet. Most of the failure of the chain is due to the fatigue fracture of the chain plate caused by s...

AI Technical Summary

Problems solved by technology

[0002] At present, in the large-load chain structure, the head of the pin shaft is circular. When installing and using, it is necessary to insert the round head of the pin shaft into the circular through hole of the chain plate and fix it. Because the large-load chain is working During the process, the pin shaft will rotate in the circular through hole. The rotation of the pin shaft will cause the chain plate to shear the pin shaft and cause the pin shaft to be damaged, which will affect the service life of the chain. Sometimes, in order to prevent the pin shaft from rotating, the pin shaft The arc of the head is symmetrically cut flat, but this will cause stress concentration at the corner where the arc and the plane meet. Most of the failure of the chain is due to the fatigue fracture of the chain plate caused by stress concentration.

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