Openable-closeable drill bit

A kind of technology of opening and closing, drill bit, which is applied in the direction of construction, etc., can solve the problems of easy deformation, the center fin of the drill bit cannot be opened normally, etc., and achieve the effect of easy deformation, high strength and long life

Active Publication Date: 2017-05-24
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

[0005] The object of the present invention is to provide an openable and closable drill bit, which has a simple structure and is convenient for loading and unloading, and is used to solve the problem that whe...

Method used

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  • Openable-closeable drill bit
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  • Openable-closeable drill bit

Examples

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Embodiment Construction

[0027] see figure 1 , shows an embodiment of the openable and closing drill bit of the present invention.

[0028] The open-close drill includes a hollow drill body 1 and a central movable wing 2 hinged with the hollow drill body 1. The hollow drill body 1 is provided with three or more blades, and the blades are at least provided with A cutting tooth 5, the central movable fin 2 is provided with at least one cutting tooth 5 and positioned on the hollow drill bit body through the spring positioning pin 3.

[0029] Wherein, the hollow drill bit body 1 is processed with a groove 4 for installing the central movable fin 2, one end of the central movable fin 2 is connected in the hollow drill bit body groove 4 through a hinged structure, and a positioning groove 17 is provided at the other end, The positioning groove is used for the spring positioning pin 3 to be stuck in it for positioning when the central movable flap 2 is closed. Preferably, the groove 4 is a semi-open groove...

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PUM

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Abstract

An openable-closed drill bit comprises a hollow drill bit body and a central moving wing hinged to the hollow drill bit body. The hollow drill bit body is provided with at least three knife wings, each knife wing is provided with a cutting tooth at least, the central moving wing is provided with at least one cutting tooth and positioned to the hollow drill bit body through a spring positioning pin, a groove for mounting the central moving wing is formed in the hollow drill bit body, one end of the central moving wing is connected in the groove of the hollow drill bit body through a hinging structure while the other end of the same is provided with a positioning groove, the positioning groove allows the spring positioning pin to be clamped therein for positioning when the central moving wing is closed, the groove is of a half-open groove structure, and the hinging structure is positioned at one open end of the groove. Therefore, the openable-closeable drill bit is simple in structure and convenient to mount and demount and is used for solving the technical problem that the central wing of the drill bit cannot be normally opened caused by the fact that the drill bit body is highly stressed and is prone to deforming when the drill bit comes across hard rock during drilling of a lower sieve pipe in a drill column.

Description

technical field [0001] The present invention relates to the technical field of drill bits, in particular to an openable and closable drill bit, which is used in the drilling process through the center of the drill rod without lifting casings or instruments, and is especially suitable for gas drainage drills in soft and outburst coal seams. Drill pipe center down screen pipe process is carried out in hole construction. Background technique [0002] In the utility model patent "Detachable Core Drill Bit for Drilling" (ZL: 200820028443.1) filed by the applicant earlier, the problem of lowering the pipe through the central through hole of the drill pipe without mentioning the drill is solved. The drill bit can be drilled into a hole and then lowered into the screen pipe through the inner hole of the drill pipe to keep the gas drainage channel unblocked. Left in the hole, the inner core cannot be reused, resulting in material waste. The utility model patent "a articulated core ...

Claims

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Application Information

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IPC IPC(8): E21B10/43
Inventor 刘刚李锁智张朋戴永波高晓亮李耿王传留姜政刚张献振伍涛
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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