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variable thrust drill

A technology of variable thrust and drill body, which is applied to drill bits, drilling equipment, earthwork drilling and production, etc., and can solve problems such as inability to achieve stable positioning of movable drill bits

Inactive Publication Date: 2016-08-17
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, this solution cannot achieve the function of stably positioning the movable drill bit.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0016] Example 1: A variable thrust reducing drill, see figure 1 , The outer drill rod 1 and the inner drill rod 2 are nested with each other, and a structure that can only slide axially is provided between the two, such as spline fitting, or a concave groove matching the guide rib 10 is provided on the outer side wall of the inner casing groove.

[0017] A fixed drill bit 3 is installed at the front end of the inner drill rod 2, and a movable drill bit is arranged between the outer drill rod 1 and the inner drill rod 2.

[0018] figure 1 Among them, the movable bit includes multiple sets of drill body one 4a and drill body two 4b, and supports 12a and 12b are fixed on the outer side of the outer drill rod 1 and the inner drill rod 2, respectively. The ends of the drill body one 4a and the drill body two 4b of each group are hinged on the supports 12a and 12b through pins, respectively. The other ends of each drill body 4a and drill body 2 4b are hinged together by a pin.

[0019] ...

Embodiment 2

[0021] Embodiment 2: Another variable thrust reducing drill, the drawings are not drawn, the content is basically the same as the embodiment, the similarities are not repeated, the difference is: the inner drill rod is located at the rear end and the outer drill rod is located at the front end, fixed The drill rod is arranged at the end of the outer drill rod.

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Abstract

The invention discloses a variable-thrust and variable-diameter drill, which includes an outer drill rod and an inner drill rod, a fixed drill bit and a movable drill bit; an outer lock sleeve and an inner lock sleeve are set on the inner side of the outer sleeve, and the butt joint of the outer lock sleeve and the inner lock sleeve Matching and intermeshed bevel teeth are provided at the end; guide grooves and pressure springs are provided at the same time. The present invention can make the drilling tool expand or shrink by changing the way of pushing the drill rod. After contracting, it can be in a stable state by the action of the pressure spring, and it can also be in a stable state by being fixed by the locking mechanism after unfolding, so as to expand the outer diameter of the drilling tool at any time. the goal of.

Description

Technical field [0001] The invention relates to a drilling tool in the field of coal mine gas prevention and control, and in particular to a drilling tool that relies on changing thrust to achieve the purpose of variable diameter hole expansion. Background technique [0002] Some coal seams have high gas content and poor gas permeability, which brings difficulties to gas prevention and control, and there is a danger of coal and gas outburst, which is dangerous to the safety of miners. Gas pre-drainage is an important measure for gas prevention, but the soft coal seam has poor air permeability and poor pre-drainage effect. At present, my country’s requirements for the outer hole diameter of outburst coal seam drilling should not exceed 120mm, and the inside of the drill hole can be reamed. The structure of the drill hole is small and large inside is conducive to forming a layer of coal wall. If the inside of the hole is caused by high gas pressure Outstanding events, the coal wall...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B10/26
Inventor 李辉林龙程磊陈魁奎李超岳志奇王新伟
Owner HENAN POLYTECHNIC UNIV
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