Coal mine gas extraction hole drill bit

Abstract

The utility model relates to a coal mine gas extraction hole drill bit which comprises a drill rod, a drill bit body is arranged at the bottom end of the drill rod, a cavity is formed in the drill rod, a gas outlet pipe is arranged on one side of the drill rod, an extraction pipe is arranged in the cavity, and an anti-blocking mechanism is arranged between the extraction pipe and the drill rod. According to the coal mine gas extraction hole drill bit, an anti-blocking mechanism is arranged in an extraction pipe, if the surface of a filter screen is blocked by coal dust, a motor can be controlled to drive a gas conveying pipe to rotate by 90 degrees, a pneumatic spray head faces a ventilation opening, a gas inlet pipe is connected with an external gas source, and gas enters the gas inlet pipe and is sprayed out through the pneumatic spray head; the pneumatic nozzle sprays out gas in a pressurized mode, coal dust on the filter screen can be blown away, the coal dust is prevented from blocking the ventilation opening, and the problem that if the filter screen of the proportional device is blocked by fine coal dust, the extraction efficiency is still affected is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas extraction, in particular to a coal mine gas extraction hole drill bit. Background Art

[0002] In the last century, gas was a harmful gas in coal mines, but now it is considered a clean energy source and has been recognized to a large extent by both the industry and the outside world. A large amount of gas is produced during coal mining. Before mining, the gas in the mine needs to be extracted. During the extraction, the coal seam needs to be drilled, and then the gas is extracted out through the holes on the surface of the extraction pipe.

[0003] After searching, for example, the utility model patent with Chinese patent number CN219932074U discloses a coal mine gas extraction hole drill bit structure. The device drives the drill rod through the coal mine layer to contact the internal gas through the rotating drill bit, and then allows the gas to enter the extraction pipe groove through the through hole and enter the extraction pipe through the air holes opened on the surface of the extraction pipe. Finally, the discharge of the extracted gas is controlled by the air valve. During the insertion of the drill rod, the filter screen on the inside of the through hole can effectively prevent coal dust from entering the extraction pipe, thereby avoiding the blockage of the extraction pipe and improving the extraction efficiency. However, if the filter screen is blocked by fine coal dust, it will still affect the extraction efficiency. Therefore, a coal mine gas extraction hole drill bit is proposed to solve the above problem. Utility Model Content

[0004] (1) Technical problems solved

[0005] In response to the deficiencies of the prior art, the utility model provides a coal mine gas extraction hole drill bit, which has the advantages of preventing the extraction port from being blocked by coal dust, and solves the problem that the filter screen set in the comparative device still has the risk of being blocked by coal dust.

[0006] (2) Technical solution

[0007] To achieve the above-mentioned object, the present invention provides the following technical solution: a coal mine gas extraction hole drill bit, comprising a drill rod, a drill bit provided at the bottom end of the drill rod, a cavity formed inside the drill rod, an air outlet pipe provided on one side of the drill rod, an extraction pipe provided inside the cavity, and an anti-blocking mechanism provided between the extraction pipe and the drill rod;

[0008] The anti-clogging mechanism includes an air vent, an air inlet pipe, a rotating connector, an air supply pipe, a motor, a branch pipe, a pneumatic nozzle and a filter. A plurality of air vents are opened on the outer wall of the drill rod. An air inlet pipe is provided on the side of the drill rod away from the air outlet pipe. One end of the air inlet pipe is connected to a rotating connector. The air supply pipe is rotatably connected to the rotating connector. The bottom end of the air supply pipe is connected to the motor output shaft. A plurality of branch pipes are connected to the side wall of the air supply pipe. The side of the branch pipe away from the air supply pipe is connected to the pneumatic nozzle. A filter is provided inside the air vent.

[0009] Furthermore, the gas outlet pipe is connected to the interior of the extraction pipe, and a control valve is provided on the gas outlet pipe.

[0010] The extraction hole drill bit of the utility model can control the extraction or stopping of gas by arranging a control valve.

[0011] Furthermore, one end of the air inlet pipe close to the rotary connector passes through the drill pipe and extends to the interior of the extraction pipe.

[0012] Furthermore, a plurality of air inlets are provided on the outer wall of the extraction pipe, and the extraction pipe is connected with the interior of the cavity through the air inlets.

[0013] The extraction hole drill bit of the present invention is provided with an air inlet. When gas enters the cavity, it can enter the extraction pipe through the air inlet. Several air inlets and air vents are arranged on the same horizontal line so that when the pneumatic nozzle sprays gas, the gas can be sprayed directly from the air inlet to the air vent to prevent the gas movement path from being blocked.

[0014] Furthermore, one end of the motor away from the gas pipe is fixedly connected to the inner wall of the extraction pipe, and the position of the branch pipe corresponds to the position of the vent.

[0015] The extraction hole drill bit of the utility model is provided with the above structure, and when the branch pipe is rotated to be on the same horizontal line as the vent, the gas can be directly ejected toward the vent.

[0016] Furthermore, a control valve is provided on the air inlet pipe, the drill bit and the drill rod are connected by bolts, and the vent is communicated with the interior of the cavity.

[0017] The extraction hole drill bit of the present invention can control the opening and closing of the air inlet pipe by setting the above structure. When the filter needs to be processed, the control valve of the air inlet pipe can be opened and the control valve of the air outlet pipe can be closed. When gas is extracted normally, the control valve of the air inlet pipe is closed and the control valve of the air outlet pipe is opened.

[0018] (3) Beneficial effects

[0019] Compared with the existing technology, the technical solution of this application has the following beneficial effects:

[0020] The coal mine gas extraction hole drill bit is provided with an anti-clogging mechanism in the extraction pipe. If the surface of the filter is clogged with coal dust, the motor can be controlled to drive the gas pipe to rotate 90 degrees, so that the pneumatic nozzle is facing the air vent, and the air inlet pipe is connected to the external air source, so that gas enters the air inlet pipe and is ejected through the pneumatic nozzle. The pneumatic nozzle pressurizes the gas and ejects it, which can blow away the coal dust on the filter and prevent the coal dust from clogging the air vent. This solves the problem that if the filter of the comparative device is clogged with fine coal dust, the extraction efficiency will still be affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a front cross-sectional view of the utility model;

[0022] Figure 2 This is the front view of the utility model;

[0023] Figure 3 For this utility model Figure 1 A magnified view of the structure at center A.

[0024] In the figure: 1 drill rod, 2 drill bit, 3 cavity, 4 air outlet pipe, 5 extraction pipe, 6 anti-blocking mechanism, 601 air vent, 602 air inlet pipe, 603 rotary connector, 604 air supply pipe, 605 motor, 606 branch pipe, 607 pneumatic nozzle, 608 filter. DETAILED DESCRIPTION

[0025] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] See also Figure 1-3 The coal mine gas extraction hole drill bit in this embodiment includes a drill rod 1, a drill bit 2 is provided at the bottom end of the drill rod 1, a cavity 3 is opened inside the drill rod 1, an air outlet pipe 4 is provided on one side of the drill rod 1, an extraction pipe 5 is provided inside the cavity 3, and an anti-blocking mechanism 6 is provided between the extraction pipe 5 and the drill rod 1. When extracting gas, the drill bit structure first drives the drill rod 1 through the coal mine layer to contact the internal gas, and the gas enters the cavity 3 through the vent 601 and enters the extraction pipe 5 through the air inlet opened on the surface of the extraction pipe 5. Finally, the discharge of the extracted gas is controlled by the control valve on the air outlet pipe 4.

[0027] Specifically, the outer wall of the drill pipe 1 is provided with a plurality of vents 601, and an air inlet pipe 602 is provided on the side of the drill pipe 1 away from the air outlet pipe 4. One end of the air inlet pipe 602 is connected to a rotary connector 603, and a gas pipe 604 is rotatably connected to the rotary connector 603. The bottom end of the gas pipe 604 is connected to the output shaft of a motor 605. The side wall of the gas pipe 604 is connected to a plurality of branch pipes 606, and the side of the branch pipe 606 away from the gas pipe 604 is connected to a pneumatic nozzle 607. A filter screen 608 is provided inside the vent 601, and the filter screen 608 can prevent coal dust from entering the extraction pipe 5 when drilling. However, if the surface of the filter 608 is clogged with coal dust, the motor 605 can be controlled to drive the gas pipe 604 to rotate ninety degrees, so that the pneumatic nozzle 607 faces the air vent 601, and the air inlet pipe 602 is connected to the external gas source, so that the gas enters the air inlet pipe 602 and is ejected through the pneumatic nozzle 607. The pneumatic nozzle 607 pressurizes the gas and ejects it, which can blow away the coal dust on the filter 608 to prevent the coal dust from clogging the air vent 601. After the processing is completed, the motor 605 is controlled to drive the gas pipe 604 to reverse to prevent the pneumatic nozzle 607 from affecting the gas from entering the inside of the extraction pipe 5 from the air inlet.

[0028] Furthermore, when the filter 608 needs to be processed, the control valve of the air inlet pipe 602 can be opened and the control valve of the air outlet pipe 4 can be closed. When gas is extracted normally, the control valve of the air inlet pipe 602 is closed and the control valve of the air outlet pipe 4 is opened.

[0029] Specifically, the end of the motor 605 away from the gas pipe 604 is fixedly connected to the inner wall of the extraction pipe 5, and the position of the branch pipe 606 corresponds to the position of the vent 601. When the gas enters the cavity 3, it can enter the extraction pipe 5 through the air inlet. Several air inlets and the air vent 601 are arranged on the same horizontal line, so that when the pneumatic nozzle 607 sprays, the gas can be sprayed directly from the air inlet to the air vent 601 to prevent the gas movement path from being blocked.

[0030] To sum up, the coal mine gas extraction hole drill bit, by setting an anti-blocking mechanism 6 in the extraction pipe 5, if the surface of the filter 608 is blocked by coal dust, the motor 605 can be controlled to drive the gas pipe 604 to rotate ninety degrees, so that the pneumatic nozzle 607 is facing the air vent 601, and the air inlet pipe 602 is connected to the external air source, so that the gas enters the air inlet pipe 602 and is ejected through the pneumatic nozzle 607. The pneumatic nozzle 607 pressurizes the gas and ejects it, which can blow away the coal dust on the filter 608 and prevent the coal dust from blocking the air vent 601, thereby solving the problem that if the filter of the comparative device is blocked by fine coal dust, the extraction efficiency will still be affected.

[0031] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0032] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A coal mine gas extraction hole drill bit, comprising a drill rod (1), characterized in that: A drill bit (2) is provided at the bottom end of the drill rod (1), a cavity (3) is provided inside the drill rod (1), an air outlet pipe (4) is provided on one side of the drill rod (1), an extraction pipe (5) is provided inside the cavity (3), and an anti-blocking mechanism (6) is provided between the extraction pipe (5) and the drill rod (1); The anti-blocking mechanism (6) comprises an air vent (601), an air inlet pipe (602), a rotating connector (603), an air delivery pipe (604), a motor (605), a branch pipe (606), a pneumatic nozzle (607) and a filter (608). The outer wall of the drill rod (1) is provided with a plurality of air vents (601). An air inlet pipe (602) is provided on the side of the drill rod (1) away from the air outlet pipe (4). One end of the air inlet pipe (602) is connected to the air outlet pipe (4). A rotating connector (603) is connected to the rotating connector (603), and an air pipe (604) is rotatably connected to the rotating connector (603). The bottom end of the air pipe (604) is connected to the output shaft of a motor (605). The side wall of the air pipe (604) is connected to a plurality of branch pipes (606). The side of the branch pipe (606) away from the air pipe (604) is connected to a pneumatic nozzle (607). A filter screen (608) is provided inside the air vent (601).

2. The coal mine gas extraction hole drill bit according to claim 1, characterized in that: The gas outlet pipe (4) is connected to the interior of the extraction pipe (5), and a control valve is provided on the gas outlet pipe (4).

3. The coal mine gas extraction hole drill bit according to claim 1, characterized in that: One end of the air inlet pipe (602) close to the rotary connector (603) passes through the drill pipe (1) and extends to the interior of the extraction pipe (5).

4. The coal mine gas extraction hole drill bit according to claim 1, characterized in that: The outer wall of the extraction pipe (5) is provided with a plurality of air inlets, and the extraction pipe (5) is connected to the interior of the cavity (3) through the air inlets.

5. The coal mine gas extraction hole drill bit according to claim 4, characterized in that: One end of the motor (605) away from the gas pipe (604) is fixedly connected to the inner wall of the extraction pipe (5), and the position of the branch pipe (606) corresponds to the position of the vent (601).

6. The coal mine gas extraction hole drill bit according to claim 1, characterized in that: A control valve is provided on the air inlet pipe (602), the drill bit (2) and the drill rod (1) are connected via bolts, and the vent (601) is in communication with the interior of the cavity (3).

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