Contact backstop of logarithmic spiral profile wedge blocks

Abstract

The invention discloses a contact backstop of logarithmic spiral profile wedge blocks, which is used for overcoming the defects of the conventional eccentric circular curved profile wedge block contact backstop. The backstop comprises an outer ring, an inner ring, a retainer, wedge blocks, supporting rollers, restoring springs, check rings, end covers, an anti-rotating pin and backstopping arms. The logarithmic spiral profile wedge blocks are adopted in the contact backstop, and the included angle between the pole diameter of any points on the logarithmic spiral and the tangential direction of the point is a fixed value, so that the working wedge angles between the wedge blocks of the profile and the inner and outer rings of the backstop are fixed values in the backstopping process, the contact pressure and the contact stress of the backstop are not changed due to changes of contact points, and the backstop can be stable in contact and reliable in backstopping. The backstop has the advantages of low contact stress, low abrasion, long service life, stability and reliability in backstopping, good backstopping effect, simplicity in reverse separation, convenience in disassembly and assembly and the like, and is easy to maintain.

Description

technical field [0001] The invention relates to a backstop, in particular to a contact backstop of a logarithmic helical surface wedge installed in a belt conveying device. Background technique [0002] A backstop is a device that prevents reversal and supports heavy objects from moving. The backstop is often used in belt conveyors. Its function is to prevent the operation of equipment such as rollers in a timely and effective manner when problems such as abnormal reversal of the equipment occur, prevent accidents such as belt speeding and slipping, and reduce economic losses for enterprises. . It is precisely because of the safety performance of the backstop that the backstop has been widely used in the fields of material transportation, mechanical support equipment fixtures and other fields. [0003] At present, there are mainly five types of backstops: electromagnetic brake shoe type, ratchet type, belt type, roller type and wedge type backstop. The wedge type backstop...

AI Technical Summary

Problems solved by technology

But there are also disadvantages at the same time. The contact between the wedge and the inner and outer rings is a convex-convex contact, and the contact stress is relatively large.

Moreover, the contact surface is small during work, forming hard point contact and uneven wear

When the contact reaches a certain number of times, a small table will be formed after wear and tear, and it will not recover automatically after the backstop, thus affecting the stability, reliability and service life of the working performance

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