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Variable diameter drill by varying pushing force

A technology of thrust and drill body, which is applied in the field of drilling tools and drilling tools, and can solve problems such as the inability to achieve stable positioning of movable drill bits

Inactive Publication Date: 2014-02-26
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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  • Variable diameter drill by varying pushing force
  • Variable diameter drill by varying pushing force
  • Variable diameter drill by varying pushing force

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: a kind of variable-diameter drill that relies on changing thrust, see figure 1 , the outer drill rod 1 and the inner drill rod 2 are mutually nested, and a structure that can only slide axially is set between the two, such as through a spline fit, or a concave hole that cooperates with the guide rib 10 is set on the outer wall of the inner casing. groove.

[0017] A fixed drill bit 3 is installed on 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 drill bit includes multiple sets of drill body 1 4a and drill body 2 4b, and supports 12a and 12b are fixed on the outer sides of the outer drill rod 1 and the inner drill rod 2 respectively. The ends of each group of drill body one 4a and drill body two 4b are respectively hinged on the supports 12a and 12b through pin shafts. The other ends of each group of drill body one 4a and dri...

Embodiment 2

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

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PUM

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Abstract

The invention discloses a variable diameter drill by varying pushing force. The variable diameter drill comprises an outer drill rod, an inner drill rod, a fixed drill bit and a movable drill bit, an outer locking sleeve and an inner locking sleeve are sleeved on the inner side of an outer sleeve, and abutting ends of the outer locking sleeve and the inner locking sleeve are provided with matched and meshed bevel gears, guide grooves and a pressure spring. A drill tool can be unfolded or folded by varying the pushing force applied to the drill rods, and can be stable under the action of the pressure spring after folded and by being fixed through a locking mechanism after unfolded, so that the external diameter of the drill tool can be expanded at any time.

Description

technical field [0001] The invention relates to a drilling tool in the field of gas prevention and control in coal mines, in particular to a drilling tool that achieves the purpose of variable-diameter reaming by changing the thrust. Background technique [0002] The gas content of some coal seams is high, and the air permeability of the coal seams is poor, which brings difficulties to the gas prevention and control work, and there is a danger of coal and gas outburst, which endangers the safety of miners. Gas pre-extraction is an important measure for gas control, but the soft coal seam has poor air permeability and the effect of pre-extraction is poor. At present, in my country, the outer hole diameter of outburst coal seam drilling is required to be no more than 120mm, and the inside of the hole can be reamed. In case of outstanding events, the coal wall plays a protective role. [0003] There are many technical means about reaming, for example, the invention patent ...

Claims

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Application Information

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IPC IPC(8): E21B10/26
Inventor 李辉程磊陈魁奎李超岳志奇王新伟
Owner HENAN POLYTECHNIC UNIV
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