Pillar connecting device

Abstract

The invention discloses a pillar connecting device applied to a hydraulic support of an underground coal mine coal face. The pillar connecting device comprises a nest column plate (1) integrated with a beam body (6), an arc bolt (2) with a thread (14), a connecting pin (3), a tight nut (4) and a column head (5). A horizontal hole (17) is formed in the column head (5), the column head is provided with a semispherical top (9), and the column head is integrally connected with a hydraulic prop. A groove (7) is formed in the column nest plate (1), the bottom of the groove is an arc face, the arc portion of the arc bolt (2) is matched with the arc face of the bottom of the groove, the arc portion of the arc bolt penetrates through the groove (7), and the column nest plate (1), the arc bolt (2) and the column head (5) are connected. By means of the structure, an allowable swing angle of a top beam can be expanded through movement of the arc bolt and rotation of the column head around the connecting pin (3). When the swing angle is transfinite, the arc bolt can be pulled and broken to prevent the hydraulic prop from being bent. Furthermore, the arc bolt is easy to replace, strong in corrosion resistance and capable of reducing maintenance load and maintenance cost.

Description

technical field [0001] The invention relates to a column-beam connection device used on a hydraulic support of an underground coal mining face in a coal mine. Background technique [0002] In most of the existing hydraulic supports, the connecting device between the hydraulic prop and the top beam includes a column socket plate with a spherical socket and a pin hole, a connecting pin and a spherical top with a horizontal hole for the pin. stigma. The connecting pin passes through the transverse hole of the column socket plate and the column head. This is to prevent the hydraulic strut from being disengaged from the top beam. Because there will be a certain relative swing between the top beam and the bottom beam during use, once the swing exceeds the limit, it will cause great destructive force, either to bend the connecting pin or to break the hydraulic prop. In order to solve this problem, some remedial measures have been adopted in previous hydraulic supports. For exam...

AI Technical Summary

Problems solved by technology

[0004] In the chain suspension hydraulic support (Chinese patent application number ZL200520019152.2), because the top beam is wider, the swing angle of the top beam is significantly smaller than that of the suspension top beam hydraulic support. The capacity is greatly improved compared with the steel wire rope, and the allowable swing angle is also greatly improved compared with the connecting pin scheme, but when it is used to support the roof with a false roof, the ball head is broken off from time to time.

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