Bottom reaming device for roadway anchor hole

Abstract

The invention belongs to the field of supports in coal mines, and discloses a roadway anchor hole hole-bottom reaming device, comprising a support connecting rod (3), rotating cutters (5), a cutter connecting spring pin (6), a push rod (7), a cutter support sleeve (8), and a drilling tool handle (10). The first end of the push rod (7) is provided with a plurality of rotating cutters (5). One end (5) of the rotating cutter (5) is connected with the push rod (7) through the support connecting rod (3), and the other end is connected with the drilling tool handle (10) which is on the second end of the support connecting rod (3) through the cutter support sleeve (8). The drilling tool handle (10) pushes the push rod (7) to move under the action of external forces, so as to apply external forces on the rotating cutters (5), so the rotating cutters (5) expand rotating radius outward. The device improves binding power of a roadway anchoring agent and drill hole surrounding rocks, improves anchoring system stability, and has significance on controlling occurrence of wall caving and roof collapse accidents in an anchor bolt support roadway.

Description

technical field [0001] The invention belongs to the field of coal mine support and relates to a hole bottom reaming device for roadway anchor holes. Background technique [0002] In recent years, bolt support technology has become one of the main support forms of coal mine roadway support due to its low cost, simple construction process, and fast construction speed. of a revolution. Bolt support is to anchor the front end (anchor head) of the bolt to the stable rock mass. On the one hand, at the end of the rod body (anchor tail), the axial preload is applied to the rod body through the joint action of the bolt tray and the pre-tightening nut. , so as to inhibit the axial deformation of the surrounding rock of the roadway along the rod body, and prevent the surrounding rock from separating layers; [0003] In the construction of the existing bolt support technology, the installation and anchoring process of the bolt is generally as follows: first, use the "drill bit-drill p...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem in the existing anchoring technology that the bonding surface between the anchoring agent and the hole wall is damaged due to insufficient strength of the anchoring hole wall, which eventually leads to the failure of the anchoring system, the invention provides a roadway anchoring hole bottom reaming device

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