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The central through hole can be opened and closed high and low voltage switching device

A central through-hole, open-close technology, which is applied in wellbore/well valve devices, drilling equipment and methods, wellbore/well components, etc. , the effect of improving efficiency and saving costs

Active Publication Date: 2022-02-22
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a high and low pressure switching device with a central through hole that can be opened and closed, which has a simple structure, is easy to operate, and can be used repeatedly, so as to solve the problem of the existing drilling-while-drilling hydraulic reaming technology in the construction of holes in broken and soft coal seams in underground coal mines. When the gas drainage is drilled, the channel between the hole-making points is blocked after the drill is lifted, so the hole protection screen cannot be lowered to the depth of the drill hole

Method used

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  • The central through hole can be opened and closed high and low voltage switching device
  • The central through hole can be opened and closed high and low voltage switching device
  • The central through hole can be opened and closed high and low voltage switching device

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Embodiment Construction

[0036] The present invention will be described in detail below in conjunction with the accompanying drawings to make the advantages and features of the present invention easier for those skilled in the art to understand and implement, but the examples given are not intended to limit the present invention.

[0037] Such as Figure 1-Figure 8 As shown, it is the first embodiment of a central through-hole openable and closable hydraulic reaming device of the present invention, which can especially meet the requirement of lowering the Ф32mm hole-protecting screen commonly used in underground coal mines.

[0038] The central through-hole openable and closable hydraulic reaming device includes an outer pipe joint 1 and a central through-hole opening and closing assembly inside the outer pipe joint 1 .

[0039] Among them, see figure 2 , the outer pipe adapter 1 is a cylindrical structure with an outer diameter of Ф90 mm and a wall thickness of the pipe body of 7 mm. The outer pipe...

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Abstract

A central through-hole openable and closable hydraulic reaming device, comprising an outer pipe joint and a central through-hole opening and closing assembly located inside the outer pipe joint. The central through-hole opening and closing assembly includes a base, a movable ring, a spring, and a connecting rod , hinge cover and gland, the spring fits on the outer edge of the connecting rod, one end leans against the base, the other end leans against the movable ring, one end of the connecting rod is fixed to the base, and the other end is hinged to the hinge cover , the movable ring is provided with a cavity, the upper part of the cavity is covered with the hinge cover, and the lower part of the connecting rod passes through, and the gland can lean against the hinge cover when the hinge cover protrudes from the cavity. The hinge cover rotates inward to close the central through hole; thus, the present invention is simple in structure, easy to operate, and reusable, and solves the problem of using the existing hydraulic reaming technology while drilling for gas drainage in underground coal mines in broken soft coal seams. When drilling, the channel between the hole-making points is blocked after the drill is lifted, which results in the problem that the hole protection screen cannot be lowered to the drilling depth.

Description

technical field [0001] The invention relates to the technical field of underground drilling in coal mines, in particular to a central through-hole openable and closed high-low pressure switching device suitable for the drilling-type hydraulic reaming of underground holes in soft coal seams in coal mines and the construction of screen pipe protection hole drilling. device. Background technique [0002] In recent years, with the development and popularization of hydraulic drilling, expansion technology and supporting equipment, many coal mines have used this technology to improve drainage efficiency, reduce the time for drainage to reach the standard, accelerate the speed of coal roadway excavation, and effectively alleviate the problem of "drainage". ", Digging, Mining" takes over the tense situation. [0003] At present, in the hydraulic reaming device used in the market for the hydraulic reaming process, the central through hole is blocked by the piston body, and its high ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B7/18E21B7/28E21B7/20E21B34/10
CPCE21B7/18E21B7/28E21B7/20E21B34/10
Inventor 董昌乐伍涛吴智峰王亚波杨虎伟董萌萌王传留高晓亮
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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