Gas extraction blowout preventer for coal mine drilling

Abstract

The invention relates to the technical field of coal mine drilling blowout prevention, in particular to a gas extraction blowout prevention device for coal mine drilling, which comprises a fixed pipe provided with a discharge port and an extraction port, and the discharge port and the extraction port are respectively communicated with external extraction equipment; the stabilizing frame is fixed at the upper end of the fixing pipe; the pressure relief seat is fixed on the fixed pipe, and a pressure relief bin with cooling liquid is formed in the pressure relief seat; the sealing bag body is fixed at one end, far away from the pressure relief seat, of the fixed pipe; the blowout prevention assembly is arranged in the fixing pipe and the pressure relief seat in a sliding mode, and a drill rod is arranged in the blowout prevention assembly in a sliding mode; when drilling work is conducted on a coal mine, coal dust and cooling liquid can be collected through the blowout prevention assembly, leakage is avoided, when gas and coal dust are sprayed out due to damage of the balance state of the coal mine, secondary buffering and pressure relief can be conducted on sprayed-out airflow, and damage of the gas and coal dust to the device is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of coal mine drilling, in particular to a gas extraction and blowout prevention device for coal mine drilling. Background Art

[0002] The gas extraction and blowout prevention device for coal mine drilling is a key equipment in coal mine safety production. Its main function is to prevent the ejection of gas and coal dust during the drilling process and ensure the safety of coal mine operations.

[0003] The existing blowout prevention device adopts an expandable capsule, an expandable capsule air inlet pipeline and other structures to seal the borehole gap and prevent the gas and coal dust from being sprayed out. However, excessive spraying pressure of the gas during spraying may cause the expansion capsule to rupture, affecting the blowout prevention effect. In addition, a sensor is used for sensing during use. When gas spraying is detected, the expansion capsule is expanded, resulting in some gas and coal dust being sprayed out before blowout prevention measures can be taken, and the effect is poor. Summary of the invention

[0004] In view of the above problems, the present invention provides a gas extraction and blowout prevention device for coal mine drilling to solve the above problems.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: A gas extraction and blowout prevention device for coal mine drilling, comprising: a fixed pipe with a discharge port and an extraction port and a pressure relief seat fixedly connected to the fixed pipe; wherein a stabilizing frame is fixedly arranged on the fixed pipe, and a sealing capsule is fixedly arranged at one end of the fixed pipe away from the pressure relief seat;

[0006] The interior of the pressure relief seat is a pressure relief chamber with coolant;

[0007] A blowout prevention assembly is slidably arranged in the fixed pipe and the pressure relief seat, and a drill rod is slidably arranged in the blowout prevention assembly;

[0008] The drill rod is provided with a spiral limiting groove;

[0009] Further, preferably, the blowout prevention assembly comprises:

[0010] A first blowout prevention assembly, slidably disposed in the fixed pipe;

[0011] A discharge assembly, fixed on the first blowout prevention assembly;

[0012] The second blowout prevention component is slidably disposed in the pressure relief chamber and is fixedly connected to the discharge component.

[0013] Further, preferably, the first blowout prevention component comprises:

[0014] A sliding bin is slidably disposed in the fixed tube and has an inner diameter larger than the diameter of the drilled hole;

[0015] A sliding plate, slidably disposed in the sliding bin, and a pressure relief spring is disposed between the sliding bin and the sliding bin;

[0016] The sliding plate is provided with a plurality of material passing slots.

[0017] Further, preferably, the cross-sectional area of ​​the plurality of material transfer troughs does not exceed one third of the cross-sectional area of ​​the sliding plate.

[0018] Further, preferably, the discharge assembly comprises:

[0019] A discharge pipe, fixed on the first blowout prevention assembly;

[0020] A plurality of discharge ports are provided, and the circumference of the discharge port is opened on the discharge pipe;

[0021] A limiting ring, rotatably disposed in the discharge pipe;

[0022] A limiting block, fixed on the inner wall of the limiting ring and corresponding to the limiting groove;

[0023] The pusher blade is fixed on one end of the limiting ring close to the discharge port, and the pusher blade is a spiral blade.

[0024] Further, preferably, the second blowout prevention assembly comprises:

[0025] A resistance disk, fixed on the discharge assembly and slidably connected to the pressure relief bin;

[0026] A rotating disk is rotatably arranged in the resistance disk and is slidably connected with the drill rod.

[0027] Further, preferably, the resistance of the coolant in the pressure relief chamber to the resistance disk is greater than the resistance of the first blowout prevention assembly.

[0028] Further, preferably, the pressure relief seat is provided with a communication port connected to the pressure relief chamber, and the communication port is used to communicate with an external coolant pumping device.

[0029] Compared with the prior art, the present invention provides a gas extraction and blowout prevention device for coal mine drilling, which has the following beneficial effects:

[0030] In the present invention, when drilling in a coal mine, coal dust and coolant can be collected through the blowout prevention assembly to avoid leakage, and when the equilibrium state of the coal mine is destroyed, gas and coal dust in the coal mine will spray out. During the spraying, the gas and coal dust can be initially depressurized through the first blowout prevention assembly, thereby avoiding damage to the device by the gas and coal dust. When the spraying pressure is too large, the pressure relief spring is compressed to the limit position, at which time the blowout prevention assembly slides as a whole, and secondary buffering pressure relief is performed through the second blowout prevention assembly, further avoiding damage to the device by the gas and coal dust, and the coal dust and coolant discharged from the drilling hole can be guided through the discharge assembly, thereby facilitating collection. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The schematic diagram of the overall structure of a gas extraction and blowout prevention device for coal mine drilling is shown in cross section;

[0032] Figure 2 A schematic diagram of the structure of a blowout prevention component of a gas extraction blowout prevention device for coal mine drilling;

[0033] Figure 3 This is a schematic diagram of the structure of a discharge assembly of a gas extraction and blowout prevention device for coal mine drilling;

[0034] Figure 4 A schematic diagram of the working state of a gas extraction and blowout prevention device for coal mine drilling;

[0035] In the figure: 1. fixed pipe; 11. discharge port; 12. extraction port; 13. stabilizing frame; 2. pressure relief seat; 3. pressure relief chamber; 31. connecting port; 4. adjusting block; 5. sealing capsule; 6. blowout prevention assembly; 61. first blowout prevention assembly; 611. sliding chamber; 612. sliding plate; 613. material chute; 614. pressure relief spring; 62. discharge assembly; 621. discharge pipe; 622. discharge port; 623. limiting ring; 624. limiting block; 625. pushing blade; 63. second blowout prevention assembly; 631. resistance plate; 632. rotating plate; 7. drill rod; 71. limiting groove; 8. drilling. DETAILED DESCRIPTION

[0036] Reference Figure 1-Figure 4 The present invention provides a technical solution: a gas extraction and blowout prevention device for coal mine drilling, comprising:

[0037] A fixed pipe 1, on which a discharge port 11 and a draw port 12 for communicating with external extraction equipment are provided;

[0038] A stabilizing frame 13 is fixed on the fixing pipe 1 and is fixed by bolts connected to the outer wall of the drill hole 8;

[0039] A pressure relief seat 2 is fixed on the fixed pipe 1; a pressure relief chamber 3 is provided inside the pressure relief seat 2, and the pressure relief chamber 3 is connected to an external coolant pumping device through a connecting port 31 provided on the pressure relief seat 2;

[0040] A sealing capsule 5 is fixed to an end of the fixing pipe 1 away from the pressure relief seat 2 and is used to seal the drill hole 8;

[0041] A blowout prevention assembly 6 is slidably disposed in the fixed pipe 1 and the pressure relief seat 2, and a drill rod 7 is also slidably disposed in the blowout prevention assembly 6, and a spiral limiting groove 71 is formed on the drill rod 7;

[0042] Specifically, in this embodiment, coolant is injected into the pressure relief chamber 3 through an external coolant sheet pumping device, which can not only apply coolant to the outer wall of the drill rod 7 to reduce the temperature of the drill rod 7, but also provide a certain resistance for the blowout prevention assembly 6 slidingly arranged in the pressure relief chamber 3.

[0043] Furthermore, the blowout prevention assembly 6 comprises:

[0044] A first blowout prevention assembly 61, slidably disposed in the fixed pipe 1;

[0045] A discharge assembly 62, fixed on the first blowout prevention assembly 61;

[0046] The second blowout prevention assembly 63 is slidably disposed in the pressure relief chamber 3 and is fixedly connected to the discharge assembly 62 .

[0047] Wherein, the first blowout prevention component 61 comprises:

[0048] A sliding chamber 611 is slidably disposed in the fixed tube 1 and has an inner diameter greater than the diameter of the bore 8;

[0049] The sliding plate 612 is slidably disposed in the sliding chamber 611 , and a pressure relief spring 614 is disposed between the sliding chamber 611 .

[0050] The sliding plate 612 is provided with a plurality of material passing grooves 613 , and the cross-sectional area of ​​the plurality of material passing grooves 613 is preferably no more than one third of the cross-sectional area of ​​the sliding plate 612 .

[0051] Specifically, in the present embodiment, when the equilibrium state of the coal mine is destroyed, the gas and coal dust in the borehole 8 in the coal mine are ejected, and a part of the ejected airflow is blown to the rear through the feed chute 613 on the sliding disk 612, and the other part acts on the sliding disk 612 and compresses the pressure relief spring 614, thereby achieving preliminary pressure relief of the gas and coal dust, thereby avoiding damage to the device by the gas and coal dust. In addition, the cross-sectional area of ​​the plurality of feed chute 613 does not exceed one-third of the cross-sectional area of ​​the sliding disk 612, thereby ensuring that when the gas and coal dust are ejected, a pushing force is generated on the sliding disk 612, thereby performing a pressure relief operation.

[0052] The discharge assembly 62 includes:

[0053] A discharge pipe 621 is fixedly connected to the sliding bin 611 of the first blowout prevention assembly 61;

[0054] The discharge openings 622 are configured as a plurality and are circumferentially opened on the discharge pipe 621;

[0055] A limiting ring 623 is rotatably disposed in the discharge pipe 621;

[0056] The limiting block 624 is fixed to the inner wall of the limiting ring 623 and cooperates with the spiral limiting groove 71 provided on the drill rod 7;

[0057] The pusher blade 625 is fixed to one end of the limiting ring 623 close to the discharge port 622 , and the pusher blade 625 is a spiral blade.

[0058] Specifically, in this embodiment, the limit block 624 is inserted into the spiral limit groove 71 on the drill rod 7, so that when the drill rod 7 rotates and moves into the bore hole 8, it can drive the limit ring 623 and the push blade 625 to rotate synchronously, and the coal dust and coolant discharged from the bore hole 8 can be collected by the limit ring 623, and the guiding effect of the rotating push blade 625 can be used to push the coal slag to the discharge port 622 for discharge.

[0059] The second blowout prevention assembly 63 includes:

[0060] The resistance disk 631 is fixed on the discharge assembly 62 and is slidably connected to the pressure relief chamber 3;

[0061] The rotating disk 632 is rotatably disposed in the resistance disk 631 and is slidably connected to the drill rod 7 .

[0062] As a preferred embodiment, the resistance of the coolant in the pressure relief chamber 3 to the resistance disk 631 is greater than the elastic force of the pressure relief spring 614 .

[0063] That is to say, when the blowout pressure is too high, the pressure relief spring 614 is compressed to the limit position, at which time the blowout prevention assembly 6 slides as a whole, and a secondary buffer pressure relief is performed through the second blowout prevention assembly 63, further preventing gas and coal dust from damaging the device.

[0064] In addition, the device further comprises: an adjusting block 4, which is detachably plugged into an end of the fixing pipe 1 away from the pressure relief seat 2;

[0065] It should be noted that when inclined drilling is required, an adjusting block 4 is inserted between the coal seams at one end of the fixed pipe 1 away from the pressure relief seat 2 for adjustment, so that the device is inclined. Figure 4 , the side of the sealing sac 5 away from the adjusting block 4 is squeezed, and the internal gas moves toward the adjusting block 4, so that the side of the sealing sac 5 close to the adjusting block 4 expands, thereby completing the sealing of the borehole 8 and preventing coal dust and coolant from flowing out. That is to say, when horizontal or vertical drilling is performed, the adjusting block 4 is not required for adjustment.

[0066] Specifically, when the device is in use, it is first necessary to determine the drilling direction of the borehole 8, then set the fixed pipe 1 on the outer wall of the borehole 8, and use the stabilizing frame 13 to cooperate with the bracket set outside the borehole 8 to fix the entire device on the outer wall of the borehole 8, so that the fixed pipe 1 fits the borehole 8, and then send the drill rod 7 into the fixed pipe 1 and the blowout prevention component 6 inside the pressure relief seat 2 to complete the installation. After that, the drilling hole 8 can be constructed by driving the drill rod 7. During the construction process, the coolant in the pressure relief chamber 3 can cool the drill rod 7, and the blowout prevention component 6 can collect coal in the process of drilling construction. Dust and coolant are collected, and when the balance state of the coal mine is destroyed, the gas and coal dust in the coal mine are sprayed out. When spraying, the first blowout prevention component 61 can be used to initially release the pressure of the gas and coal dust, thereby avoiding the damage of the gas and coal dust to the device. When the spraying pressure is too large, the pressure relief spring 614 is compressed to the limit position. At this time, the blowout prevention component 6 slides as a whole, and the second blowout prevention component 63 is used for secondary buffering and pressure relief, thereby further avoiding the damage of the gas and coal dust to the device. In addition, the coal dust and coolant discharged from the borehole 8 can be guided by the discharge component 62, thereby facilitating collection.

[0067] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A gas extraction and blowout prevention device for coal mine drilling, characterized in that: include: A fixed pipe (1) provided with a discharge port (11) and a draw port (12), and a pressure relief seat (2) fixedly connected to the fixed pipe (1); Wherein, a stabilizing frame (13) is fixedly arranged on the fixed tube (1), and a sealing capsule (5) is fixedly arranged on one end of the fixed tube (1) away from the pressure relief seat (2); The interior of the pressure relief seat (2) is a pressure relief chamber (3) with cooling liquid; A blowout prevention assembly (6) is slidably arranged in the fixed pipe (1) and the pressure relief seat (2), and a drill rod (7) is slidably arranged in the blowout prevention assembly (6); The drill rod (7) is provided with a spiral limiting groove (71).

2. A gas extraction and blowout prevention device for coal mine drilling according to claim 1, characterized in that: The blowout prevention assembly (6) comprises: A first blowout prevention assembly (61) slidably disposed in the fixed pipe (1); A discharge assembly (62) fixed on the first blowout prevention assembly (61); The second blowout prevention component (63) is slidably disposed in the pressure relief chamber (3) and is fixedly connected to the discharge component (62).

3. A gas extraction and blowout prevention device for coal mine drilling according to claim 2, characterized in that: The first blowout prevention component (61) comprises: A sliding bin (611) is slidably disposed in the fixed tube (1) and has an inner diameter greater than the diameter of the drill hole (8); A sliding plate (612) is slidably disposed in the sliding bin (611), and a pressure relief spring (614) is disposed between the sliding plate and the sliding bin (611); a plurality of material passing slots (613) are provided on the sliding plate (612).

4. A gas extraction and blowout prevention device for coal mine drilling according to claim 3, characterized in that: The cross-sectional area of ​​the plurality of material transfer troughs (613) does not exceed one third of the cross-sectional area of ​​the sliding plate (612).

5. A gas extraction and blowout prevention device for coal mine drilling according to claim 2, characterized in that: The discharge assembly (62) comprises: A discharge pipe (621) fixed on the first blowout prevention assembly (61); A plurality of discharge ports (622) are provided and circumferentially opened on the discharge pipe (621); A limiting ring (623) rotatably disposed in the discharge pipe (621); A limiting block (624) is fixed on the inner wall of the limiting ring (623) and corresponds to the limiting groove (71); The pusher blade (625) is fixed to one end of the limiting ring (623) close to the discharge port (622), and the pusher blade (625) is a spiral blade.

6. A gas extraction and blowout prevention device for coal mine drilling according to claim 2, characterized in that: The second blowout prevention component (63) comprises: A resistance disk (631) is fixed on the discharge assembly (62) and is slidably connected to the pressure relief chamber (3); The rotating disk (632) is rotatably arranged in the resistance disk (631) and is slidably connected to the drill rod (7).

7. A gas extraction and blowout prevention device for coal mine drilling according to claim 6, characterized in that: The resistance of the coolant in the pressure relief chamber (3) to the resistance disk (631) is greater than the resistance of the first blowout prevention assembly (61).

8. A gas extraction and blowout prevention device for coal mine drilling according to claim 1, characterized in that: The pressure relief seat (2) is provided with a communication port (31) connected to the pressure relief chamber (3), and the communication port (31) is used to communicate with an external cooling liquid pumping device.

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