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Zero-torque anchor rod pre-tightening machine tool

A zero-torque, bolt technology, applied in the installation of bolts, mining equipment, earthwork drilling, etc., can solve the problem of increasing the composite stress concentration of the bolt thread, the fracture and damage of the bolt under high torque, and the increase of the pre-tightening force of the bolt. The effect is not obvious and other problems, so as to achieve the effect of improving the pre-tightening force of the bolt, reducing the damage of the thread, and preventing the uneven force of the support.

Inactive Publication Date: 2013-12-11
韩雪峰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pre-tightening force of the existing bolt is mainly increased by increasing the torque of the bolt nut to increase the pre-tightening force. This method has no obvious effect on the increase of the pre-tightening force of the bolt. At the same time, it increases the compound stress concentration at the root of the bolt thread, which often results in a large torque force. The anchor rod is broken and damaged along the root of the thread
With the demand for high-stress roadway support and large-section roadway support in deep mining, the demand for high pre-tightening force of bolt support is increasing. Construction needs develop a special tool to increase the pre-tightening force of the bolt to meet the construction needs of high-pre-tightening force anchors for high-strength support. It has the characteristics of reducing the composite stress concentration of anchor bolts, convenient construction, simple structure, common use with on-site construction equipment and convenient on-site construction management, etc.

Method used

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  • Zero-torque anchor rod pre-tightening machine tool
  • Zero-torque anchor rod pre-tightening machine tool
  • Zero-torque anchor rod pre-tightening machine tool

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0050]The rope fastening nut structure of the zero-torque bolt pretensioning tool is composed of a conical spring 106, a positioning circlip 107, a rope-wrapped structure fastening nut disk 108 and a rope 109, and the rope 109 is used to pull the rope-wrapped structure The tightening nut disc 108 tightens the anchor nut, and the tightening nut disc 108 with the rope 109 pulled to tighten the anchor nut.

Embodiment approach 2

[0052] The gear transmission fastening nut structure of the zero-torque bolt pre-tightening machine is composed of a conical spring 106, a positioning circlip 107, a gear structure fastening nut plate 201, a transmission gear 202, a fixed pin shaft 203 and a ratchet wrench. , using the gear transmission to drive the gear structure fastening nut plate 201 to fasten the anchor nut. The above-mentioned gear transmission can be a conical bevel gear, a rack transmission or a ratchet transmission, etc.

Embodiment approach 3

[0054] The manual fastening nut structure of the zero-torque bolt pre-tightening tool is composed of a conical spring 106, a positioning circlip 107, a fastening nut plate 301 and a dial window 302, which is manually moved from the dial window 302 The fastening nut plate 301 fastens the anchor nut.

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Abstract

The invention discloses a zero-torque anchor rod pre-tightening machine tool amongin machine tools for increasing the pre-tightening force of anchor rods. The zero-torque anchor rod pre-tightening machine tool A product mainly comprises a hydraulic jack, a bearing sleeve, a connecting rod, a transition nut, a tail nut and a fastening nut structure. The zero-torque anchor rod pre-tightening machine tool disclosed by the invention is connected with an anchor rod by characterized in that the parts are utilized for forming the zero-torque machine tool for increasing the pre-tightening force of an anchor rod, the connecting rod and the transition nut are utilized for connecting the zero-torque anchor rod pre-tightening machine tool and the anchor rod; the hydraulic jack pushes the bearing sleeve to act on an anchor rod pallet,; simultaneously, the connecting rod is pulled to pre-tighten the anchor rod,; and finally, the fastening nut structure is used for fastening the anchor rod with high pre-tightening force. According to the zero-torque anchor rod pre-tightening machine tool disclosed by the invention, the problems that as an existing anchor rod only due to utilizes aation of the thread structure on the existing anchor rod, the increase of the pre-tightening force is low, the combined stress of the end part of the anchor rod is concentrated, the anchor rod is easily twisted in the fastening process, and the stressing of a roadway support is not uniform and the like are solved. The zero-torque anchor rod pre-tightening machine tool disclosed by the invention has the advantages of ultrahighthat the pre-tightening force is ultrahigh, zero torque is achieved, the alleviation of concentration of the combined stress at the root part of the thread is reduced and simplicity in the operation is simple, and is applicable to high pre-tightening force operation of the anchor rod or the fastening operation of the thread structure.

Description

technical field [0001] The invention relates to a zero-torque bolt pre-tightening tool among tools for increasing the pre-tightening force of the bolt. Background technique [0002] The bolt preload is the main indicator of roadway support strength, and increasing the bolt preload can effectively improve the overall strength of the support. The pre-tightening force of the existing bolt is mainly increased by increasing the torque of the bolt nut to increase the pre-tightening force. This method has no obvious effect on the increase of the pre-tightening force of the bolt. At the same time, it increases the compound stress concentration at the root of the bolt thread, which often results in a large torque force. The anchor rod is broken and damaged along the thread root. With the demand for high-stress roadway support and large-section roadway support in deep mining, the demand for high pre-tightening force of bolt support is increasing. Construction needs develop a special...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D20/00
Inventor 韩雪峰窦娟娟祁博
Owner 韩雪峰
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