Drill bit structure for preventing hole collapse in gas drilling

Abstract

The utility model relates to the technical field of gas extraction, in particular to a hole collapse prevention drill bit structure for gas drilling, which comprises a drill rod, a drill bit and a gas inlet mechanism. A first connecting seat and an air outlet valve are arranged at the top end of the drill rod, and a cavity is formed in the drill rod; the drill bit is adjustably mounted at the bottom end of the drill rod; the air inlet mechanism is arranged at the top end of the drill bit and slidably connected with the drill rod, and an air inlet valve is arranged on the inner side wall of the air inlet mechanism. Through the arrangement of the air inlet mechanism, an external gas extraction mechanism can conveniently extract gas in a drill hole through the air outlet valve, the hose and the air inlet valve, the air inlet mechanism is prevented from making contact with the drill hole, air inlet interference cannot be caused, and the extraction efficiency is improved; and through the arrangement of the supporting mechanism, the drill hole is further supported, the situation that the air inlet mechanism is blocked due to drill hole collapse is avoided, and the gas extraction efficiency is further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a gas drilling prevents the drill bit structure of hole collapse. BACKGROUND

[0002] A large amount of gas will be produced in coal mining, before mining, the gas in the mine needs to be extracted, before extraction, the coal seam needs to be drilled, and then the gas in the coal seam is extracted from the drill hole.

[0003] The patent with the authorization announcement number CN219932074U discloses a coal mine gas extraction hole drill bit structure, which comprises a drill rod, one end of the drill rod is fixedly connected with a connecting shaft, the other end of the drill rod is provided with a drill bit, a gas exhaust structure penetrates through the inside of the drill rod, and one end of the drill rod is provided with a dismounting structure; the utility model drives the drill rod to contact the internal gas by rotating the drill bit, then makes the gas enter the extraction pipe groove through the through hole and enters the extraction pipe through the gas holes opened on the surface of the extraction pipe, finally controls the discharge of the extracted gas through the gas valve, and the filter screen on the inner side of the through hole can effectively prevent the coal dust from entering the inside of the extraction pipe during the insertion of the drill rod, thereby avoiding the blocking phenomenon of the extraction pipe and improving the extraction efficiency.

[0004] However, the above-mentioned disclosed scheme has the following disadvantages: the outer wall of the drill rod is tightly attached to the inner wall of the drill hole during drilling, so that the filter screen is tightly attached to the sidewall of the drill hole, thereby causing the gas to be unable to be quickly extracted along the through hole, reducing the extraction efficiency of the gas. UTILITY MODEL CONTENTS

[0005] The utility model aims at the problems in the background art and provides a drill bit structure for preventing hole collapse in gas drilling.

[0006] The technical scheme of the utility model: a drill bit structure for preventing hole collapse in gas drilling, comprising a drill rod, a first connecting seat is arranged at the top end of the drill rod, a gas outlet valve is arranged at the top end of the drill rod, and a cavity is arranged in the drill rod; a drill bit is adjustably installed at the bottom end of the drill rod; and an air inlet mechanism is arranged at the top end of the drill bit, the air inlet mechanism is slidably connected with the drill rod, an air inlet valve is arranged on the inner side wall of the air inlet mechanism, the air inlet valve is detachably connected with the gas outlet valve through a hose, and the air inlet mechanism is used for supporting the drill hole and allowing the gas in the drill hole to be output outward along the air inlet valve, the hose and the gas outlet valve.

[0007] Preferably, the drill rod is composed of a sealing cover and a rod body, the sealing cover and the rod body are detachably connected through bolts, and a sealing ring is arranged at the bottom end of the sealing cover.

[0008] Preferably, a connecting rod is installed at the bottom end of the sealing cover, a lifting mechanism is detachably installed at the bottom end of the connecting rod, and the output end of the lifting mechanism is detachably connected with the drill bit.

[0009] Preferably, the air inlet mechanism comprises a shielding seat mounted on the top end of the drill bit, a first receiving cavity is formed on the rod body, the shielding seat is in sliding connection with the first receiving cavity, a plurality of air inlets are uniformly formed on the side wall of the shielding seat, and a filter screen is arranged on the air inlets; and an inner shell is mounted on the inner wall of the shielding seat, the bottom end of the inner shell is connected with the top end of the drill bit, and an air inlet valve is mounted on the top end of the inner shell.

[0010] Preferably, the top end of the drill bit is further provided with a supporting mechanism, the supporting mechanism is composed of two annular seats and a plurality of protection rods uniformly mounted between the two annular seats, one annular seat at the bottom end is detachably connected with the top end of the drill bit, a second receiving cavity is formed on the rod body and located at the periphery of the first receiving cavity, and the annular seat is in sliding connection with the second receiving cavity.

[0011] Preferably, a groove is formed on the top end of the drill bit, one annular seat at the bottom end is in plug-in connection with the groove, and one annular seat at the bottom end is detachably connected with the drill bit through bolts.

[0012] Compared with the prior art, the above technical scheme of the utility model has the following beneficial technical effects: the detachable arrangement of the sealing cover, the rod body, the lifting mechanism and the drill bit facilitates the disassembly and maintenance of each part, and provides convenience for use; the arrangement of the air inlet mechanism facilitates the extraction of gas in the drill hole by the external gas extraction mechanism through the air outlet valve, the hose and the air inlet valve, and avoids the contact with the drill hole, so that the air inlet is not interfered and the extraction efficiency is improved; the arrangement of the supporting mechanism further supports the drill hole, avoids the blockage of the air inlet mechanism caused by the collapse of the drill hole, and further improves the gas extraction efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0014] Figure 2 It is a sectional view of the utility model;

[0015] Figure 3 It is a schematic diagram of the connection mode of the sealing cover and the rod body of the utility model;

[0016] Figure 4 It is a schematic diagram of the air inlet mechanism structure of the utility model.

[0017] Mark: 1, sealing cover; 101, first connecting seat; 2, rod body; 201, first receiving cavity; 202, second receiving cavity; 203, cavity; 3, lifting mechanism; 301, connecting rod; 4, drill bit; 401, second connecting seat; 402, groove; 5, shielding seat; 501, inner shell; 502, filter screen; 503, annular seat; 504, protection rod; 505, air inlet valve; 506, air outlet valve; 507, hose. DETAILED DESCRIPTION

[0018] Embodiment One

[0019] As Figures 1 to 4 shown, the utility model provides a gas drilling prevent hole collapse's drill bit structure, including drill rod, drill bit 4 and air inlet mechanism, the top of drill rod is provided with first connecting seat 101, is used for with external drilling equipment connection drives drill rod rotation, the top of drill rod is provided with air outlet valve 506, the inside of drill rod is provided with cavity 203, drill bit 4 can adjust the installation at the bottom of drill rod, air inlet mechanism sets up at the top of drill bit 4, air inlet mechanism and drill rod slidingly connected, the inner wall of air inlet mechanism is provided with air inlet valve 505, air inlet valve 505 is detachably connected with air outlet valve 506 through hose 507, air outlet valve 506 is connected with external gas extraction mechanism, air inlet mechanism is used for supporting drilling and the gas in the inside of drilling can be exported to outside along air inlet valve 505, hose 507 and air outlet valve 506.

[0020] Further, the drill rod is composed of a sealing cover 1 and a rod body 2, the cavity 203 is opened in the inside of the rod body 2, the drill bit 4 is in abutment with the bottom end of the rod body 2, the sealing cover 1 is detachably connected with the rod body 2 through bolts, the bottom end of the sealing cover 1 is provided with a sealing ring, the sealing property of the connection is improved, and gas leakage is avoided.

[0021] Further, the bottom end of the sealing cover 1 is provided with a connecting rod 301, the bottom end of the connecting rod 301 is detachably provided with a lifting mechanism 3 through bolts, the lifting mechanism 3 is a hydraulic rod, the output end of the lifting mechanism 3 is detachably connected with the drill bit 4, the top end of the drill bit 4 is provided with a second connecting seat 401, the lifting mechanism 3 is inserted into the inner wall of the second connecting seat 401, and the lifting mechanism 3 and the second connecting seat 401 are connected through bolts, which is convenient for disassembly and assembly.

[0022] Further, the air inlet mechanism comprises a shielding seat 5 and an inner shell 501, the shielding seat 5 is installed at the top end of the drill bit 4, a first storage cavity 201 is opened in the rod body 2, the shielding seat 5 is slidingly connected with the first storage cavity 201, a plurality of air inlets are uniformly opened in the side wall of the shielding seat 5, and a filter screen 502 is arranged on the air inlet, the inner shell 501 is installed on the inner wall of the shielding seat 5, the bottom end of the inner shell 501 is connected with the top end of the drill bit 4, a clearance is arranged on the inner side of the rod body 2 and matched with the inner shell 501, the clearance is communicated with the bottom end of the first storage cavity 201, the air inlet valve 505 is installed at the top end of the inner shell 501, and the inner shell 501, the shielding seat 5 and the drill bit 4 form an air chamber, which is convenient for the gas to enter the hose 507 along the air inlet valve 505 through the filter screen 502.

[0023] In this embodiment, the external drilling device is connected with the first connecting seat 101, the drill rod is driven to rotate, drilling is performed through the rod body 2 and the drill bit 4, when the drill bit 4 moves to a suitable position, drilling is completed, the rod body 2 and the drill bit 4 are moved to the outside of the drill hole by a suitable distance, then the controller starts the lifting mechanism 3 to drive the drill bit 4 to move away from the rod body 2, and then the shielding seat 5 slides outward along the first storage cavity 201 until the air inlet on the shielding seat 5 leaks, the external gas extraction mechanism is connected with the gas outlet valve 506, the gas in the drill hole is extracted through the external gas extraction mechanism, passes through the filter screen 502 into the air cavity on the inside of the inner shell 501, and is transported out along the air inlet valve 505, the hose 507 and the gas outlet valve 506, the filter screen 502 is arranged between the rod body 2 and the drill bit 4 and does not adhere to the inner wall of the drill hole, so that the smooth extraction of the gas is avoided, the drill bit 4 is driven away from the rod body 2 by the lifting mechanism 3 until the shielding seat 5 is separated from the first storage cavity 201, then the bolts between the lifting mechanism 3 and the second connecting seat 401 are removed, the drill bit 4 and the lifting mechanism 3 can be disassembled, then the bolts between the sealing cover 1 and the rod body 2 are removed, the sealing cover 1 can be lifted away from the rod body 2, and then the lifting mechanism 3 can be taken out, so that each part can be disassembled, repaired or replaced.

[0024] Embodiment two

[0025] As Figure 4 shown, the utility model discloses a kind of drill bit structures for preventing hole collapse of gas drilling, compared with embodiment one, drill bit 4 top end is also provided with support mechanism, support mechanism is made of two groups of annular seat 503 and multiple groups of protection rod 504 evenly installed between two groups of annular seat 503, one group of annular seat 503 at bottom end is detachably connected with drill bit 4 top end, second storage cavity 202 is opened in the periphery of rod body 2 and located at first storage cavity 201, annular seat 503 and second storage cavity 202 are slidably connected.

[0026] Further, recess 402 is opened in drill bit 4 top end, one group of annular seat 503 at bottom end is insertedly connected with recess 402, and one group of annular seat 503 at bottom end is detachably connected with drill bit 4 by bolt, to facilitate disassembling support mechanism to repair inside air inlet mechanism.

[0027] In this embodiment, when lifting mechanism 3 drives drill bit 4 away from rod body 2, annular seat 503 and protection rod 504 will slide away along second storage cavity 202, multiple groups of protection rod 504 further protect filter screen 502, avoid that air inlet hole at filter screen 502 is blocked by drill hole collapse, avoid interfering with gas extraction.

[0028] The embodiment of the utility model is described in detail above in combination with the drawings, but the utility model is not limited to this, and various changes can be made within the knowledge range possessed by the person skilled in the art without departing from the purpose of the utility model.

Claims

1. A drill bit structure for preventing borehole collapse during gas drilling, characterized in that, include The drill rod has a first connecting seat (101) at its top end, an air vent valve (506) at its top end, and a cavity (203) inside the drill rod. Drill bit (4), which is adjustablely mounted at the bottom end of the drill rod; The air intake mechanism is located at the top of the drill bit (4). The air intake mechanism is slidably connected to the drill rod. An air intake valve (505) is provided on the inner wall of the air intake mechanism. The air intake valve (505) is detachably connected to the air outlet valve (506) through a hose (507). The air intake mechanism is used to support the borehole and the gas inside the borehole can be output outward along the air intake valve (505), hose (507) and air outlet valve (506).

2. The drill bit structure for preventing borehole collapse in gas drilling according to claim 1, characterized in that, The drill pipe consists of a sealing cap (1) and a rod body (2). The sealing cap (1) and the rod body (2) are detachably connected by bolts. A sealing ring is provided at the bottom of the sealing cap (1).

3. The drill bit structure for preventing borehole collapse in gas drilling according to claim 2, characterized in that, A connecting rod (301) is installed at the bottom of the sealing cover (1). A lifting mechanism (3) is detachably installed at the bottom of the connecting rod (301). The output end of the lifting mechanism (3) is detachably connected to the drill bit (4).

4. The drill bit structure for preventing borehole collapse in gas drilling according to claim 2, characterized in that, The intake mechanism includes A shielding seat (5) is installed at the top of the drill bit (4). A first storage cavity (201) is opened on the rod body (2). The shielding seat (5) is slidably connected to the first storage cavity (201). Multiple sets of air inlets are evenly opened around the side wall of the shielding seat (5). A filter screen (502) is provided on the air inlet. And an inner shell (501) is installed on the inner wall of the shield (5), and the bottom end of the inner shell (501) is connected to the top end of the drill bit (4), and an air inlet valve (505) is installed on the top end of the inner shell (501).

5. The drill bit structure for preventing borehole collapse in gas drilling according to claim 4, characterized in that, The top of the drill bit (4) is also provided with a support mechanism, which consists of two sets of annular seats (503) and multiple sets of protective rods (504) evenly installed between the two sets of annular seats (503). The set of annular seats (503) at the bottom is detachably connected to the top of the drill bit (4). A second storage cavity (202) is provided on the rod body (2) and located on the periphery of the first storage cavity (201). The annular seats (503) are slidably connected to the second storage cavity (202).

6. The drill bit structure for preventing borehole collapse in gas drilling according to claim 5, characterized in that, The drill bit (4) has a groove (402) at the top end, and a set of annular seats (503) at the bottom end are connected to the groove (402) by insertion. The set of annular seats (503) at the bottom end are detachably connected to the drill bit (4) by bolts.

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