Scissor link mechanism for girder end expansion device

By using a scissor linkage mechanism with bidirectional hinged connection and friction-reducing washers, the problems of beam end corner deformation and jamming and large friction in the existing technology are solved, realizing stable extension and contraction of the beam end and safe driving.

CN114000421BActive Publication Date: 2026-02-27CHINA RAILWAY BAOJI BRIDGE GROUP CO LTD
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Patent Information

Application Number
CN202110998785.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2021-08-28
Publication Date
2026-02-27
Estimated Expiration
2041-08-28

AI Technical Summary

Technical Problem

Existing scissor fork mechanisms are only suitable for unidirectional extension and retraction, cannot adapt to large beam end rotation angles, are prone to deformation and jamming, and have high friction, which affects train operation safety.

Method used

The scissor linkage mechanism with bidirectional hinged connection, combined with ultra-high molecular weight polyethylene low-resistance friction-reducing washers and high-strength bushings, ensures rotational flexibility and stability, adapts to beam gap width variations of ±800mm, reduces friction, and prevents jamming.

Benefits of technology

It achieves stable expansion and contraction when the beam end rotation angle is greater than 10‰, maintains the smoothness of the rail top surface, ensures train operation safety, reduces friction, and avoids jamming.

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    Figure CN114000421B_ABST
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Abstract

The application relates to a shearing link mechanism for a beam end expansion device, which can not be deformed and blocked when the beam joint has a large horizontal and vertical rotation angle, and can expand with the rail expander when the beam end has a rotation angle of more than 10%. Two long links are connected through a bolt in the middle, an X shearing movable arm is formed, the bolt hinge part of the X shearing movable arm is connected with a mounting base A4, the left two arm heads of the X shearing movable arm are respectively hinged with one end of a left short link, the other end of the two left short links is hingedly connected through a bolt B and connected with a mounting base A, the right arm heads of the X movable arm are respectively hingedly connected with one end of a right short link, the other end of the two right short links is hingedly connected with the other end of a joint iron to form a horizontal rotation pair, and a vertical rotation pair is formed between one end of the joint iron and the mounting base B.
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Citation Information

Patent Citations

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