Safety protection integrated device for underground coal mine drilling construction and using method

Abstract

A safety protection integrated device for underground coal mine drilling construction comprises a pipe body, a sealing assembly, a piston assembly and a coal falling assembly, the sealing assembly, the piston assembly and the coal falling assembly are sequentially arranged in the pipe body, an end cover is arranged at the tail end of the pipe body, and a pulverized coal inlet is formed in the head end of the pipe body; the sealing assembly comprises an annular balloon, and in the natural state, the inner diameter of a center hole of the annular balloon is larger than the outer diameter of a drill rod used for drilling. The piston assembly comprises a piston rod and a piston ring arranged on the periphery of the piston rod in a sleeving mode, a push plate is arranged at the tail end of the piston rod, and an air inlet is formed in the pipe body. The coal falling assembly comprises a coal falling hole and a coal falling outlet, in the natural state, the coal falling hole and the coal falling outlet are correspondingly communicated in position, and after high-pressure air is introduced into the air inlet, the piston rod moves to enable the coal falling outlet to be closed. Aiming at the problem of coal mine underground gas overrun, the sealing effect can be basically optimal, and effective gas blowout prevention can be realized.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mine safety protection equipment, and particularly to an integrated device for safety protection of borehole construction in coal mines and a using method thereof. Background Art

[0002] Most of the coal mine gas control measures are mainly regional gas control measures. The cross-cut borehole construction in the floor and roof rock headings is the most widely used. During the borehole construction process, a large amount of gas often gushes out from the boreholes, and a large amount of gas also gushes out during the coal falling process of the boreholes. Therefore, a gas blowout prevention device is often used during the borehole construction to prevent a large amount of coal powder and gas from gushing out into the roadway space. However, in actual work, the blowout prevention effect of most blowout prevention devices is not obvious. They cannot collect all the gushing coal powder and gas, and a considerable part of the gas and coal powder will overflow through the gaps between the drill pipe and the orifice pipe and between the orifice pipe and the borehole wall, resulting in the phenomenon of environmental gas exceeding the limit. This is mainly because the current protective devices for blowout prevention and gas overrun control have poor sealing effects or cannot effectively seal each part between the boreholes. And currently, for the phenomenon of gas overrun, there is no equipment with good safety protection effect in the prior art. Summary of the Invention

[0003] In order to solve the above problems, the object of the present invention is to provide an integrated device for safety protection of borehole construction in coal mines and a using method thereof. Aiming at the problem of gas overrun in coal mines, the sealing effect can basically reach the optimal level, and effective gas blowout prevention can be achieved.

[0004] The technical solutions adopted by the present invention to solve the above problems are as follows:

[0005] An integrated device for safety protection of borehole construction in coal mines includes a pipe body, and a sealing component, a piston component, and a coal falling component sequentially arranged in the pipe body. Among them, an end cover is arranged at the tail end of the pipe body, and the head end of the pipe body is a coal powder inlet; the sealing component includes an annular balloon. One side of the annular balloon abuts against the end cover, and the other side extends into the inner cavity of the pipe body. And in the natural state, the inner diameter of the central hole of the annular balloon is larger than the outer diameter of the drill pipe for drilling; the piston component includes a piston rod and a piston ring sleeved on the outer periphery of the piston rod. A central hole for the drill pipe to pass through is opened in the center of the piston rod, and a push plate abutting against the annular balloon is arranged at the tail end of the piston rod. An air inlet for introducing high-pressure gas to push the piston ring and the piston rod to displace towards the annular balloon is arranged on the pipe body. After the high-pressure gas is connected, the push plate squeezes the annular balloon to form a seal around the drill pipe; the coal falling component includes a coal falling hole and a coal falling outlet. The coal falling hole is opened at the bottom of the piston rod near the head end, and the coal falling outlet is arranged at the bottom of the pipe body. And in the natural state, the coal falling hole and the coal falling outlet are correspondingly communicated. After high-pressure air is connected to the air inlet, the displacement of the piston rod closes the coal falling outlet.

[0006] Preferably, the pipe body includes an orifice pipe, a cylinder pipe, and a hole-sealing pipe that are connected in sequence. The piston rod body is disposed inside the cylinder pipe, and both ends of the piston rod pass through the cylinder pipe respectively, so that the cylinder pipe, the piston rod, and the piston ring together form a piston cylinder structure. The annular balloon and the push plate are disposed inside the orifice pipe, and the coal dropping assembly is located inside the hole-sealing pipe.

[0007] Preferably, the orifice pipe and the cylinder pipe, and the cylinder pipe and the hole-sealing pipe are respectively sealed and connected by flanges.

[0008] Preferably, the inner diameters of the orifice pipe, the cylinder pipe, and the hole-sealing pipe gradually decrease in sequence. The inner diameter of the hole-sealing pipe is adapted to the outer diameter of the drill pipe, the outer diameter of the hole-sealing pipe is adapted to the inner diameter of the underground borehole, the outer diameter of the piston ring is adapted to the inner diameter of the cylinder pipe, and the outer diameter of the annular balloon is adapted to the inner diameter of the orifice pipe.

[0009] Preferably, a limiting retaining ring is fixedly sleeved on the outer circumference of the hole-sealing pipe.

[0010] As a more preferred technical solution, an annular lining plate is further disposed at the inner end of the pipe body. One side of the annular lining plate abuts against the cover plate, and the other end abuts against and supports the annular balloon.

[0011] As a more preferred technical solution, a limiting sleeve for preventing the push plate from excessively squeezing the annular balloon is disposed at the circumferential inner wall of the pipe body corresponding to the annular balloon. The inner diameter of the limiting sleeve is smaller than the outer diameter of the push plate, and the distance between the limiting sleeve and the push plate constitutes the maximum displacement stroke of the push plate.

[0012] As a more preferred technical solution, a central hole adapted to the piston rod and for the drill pipe to pass through is provided at the center of the push plate.

[0013] As yet another more preferred technical solution, the device further includes a gas sensor, a power cut-off instrument, and a high-pressure gas solenoid valve. There are two gas sensors, which are respectively disposed in the underground roadway and the borehole, and the gas sensors are both connected to the input interface of the power cut-off instrument. One output interface of the power cut-off instrument is connected to the main switch valve of the underground drill rig, and the other output interface is connected to the high-pressure gas solenoid valve. The interface of the high-pressure gas solenoid valve is connected to the compressed air pipeline in the roadway, and the output port of the high-pressure gas solenoid valve is connected to the air inlet, so that when the gas sensor alarms, the main switch valve is cut off and the high-pressure gas solenoid valve is opened, so that the coal dropping assembly is closed and the sealing assembly seals the drill pipe.

[0014] The method for gas protection using the above-mentioned integrated safety protection device for underground drilling construction in coal mines is as follows: first, a gas sensor is arranged in the borehole, and another gas sensor is arranged in the tunnel near the working area of the drilling rig; secondly, the integrated safety protection device is sleeved on the tail end of the drill rod, and the head end of the pipe body, that is, the head end part of the sealing pipe, is placed in the borehole and fixed, and the connection of each pipeline interface is completed; finally, the drilling rig is started for drilling operation. If a gas leak occurs, the drilling rig will cut off the power supply and stop working at the first time under the control of the power cut-off device. At the same time, the integrated safety protection device is triggered to start, the drill rod is tightly sealed, and the coal drop outlet is closed, thereby forming an all-round seal for the borehole opening.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] First, the integrated safety protection device described in the present application can detect the real-time situation of gas leakage through the gas sensor at the first time when a gas leakage problem occurs, and monitor the concentration threshold of the leaked gas at any time. Once the set safety critical threshold is exceeded, the safety protection action will be automatically started at the first time, the drilling rig in the drilling construction will be stopped, and the gap at the borehole mouth will be sealed to prevent gas from leaking out of the borehole.

[0017] Second, the present application adopts a multi-component linkage design structure. Once a gas over-limit problem occurs, the multi-component linkage action will be formed immediately, and the piston assembly will slide and displace, not only to seal the coal drop assembly and the coal drop port, but also to seal the drill rod around the annular balloon in the first time, and completely seal the gap between the drill rod and the device around it, thereby achieving complete sealing outside the borehole mouth and realizing the purpose of safety protection.

[0018] Third, the device described in this application has a simple overall structure, is easy to disassemble and assemble, and is small in size, making it suitable for use in effective construction work spaces underground in coal mines, effectively improving construction efficiency and safety assurance underground in coal mines. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the present invention in its initial state when in use;

[0021] Figure 3 This is a schematic diagram of the structure of the present invention in a sealed and protected state when in use. Figure 4 It is a partial enlarged structural schematic diagram of the initial state of the present invention; Figure 5 It is a partial enlarged structural schematic diagram of the sealing protection state of the present invention.

[0022] Markings in the figure: 1. Pipe body, 101. Orifice pipe, 102. Cylinder pipe, 103. Sealing hole pipe, 2. End cover, 3. Annular balloon, 4. Piston rod, 41. Central hole, 5. Piston ring, 6. Push plate, 7. Air inlet, 8. Coal dropping hole, 9. Coal dropping outlet, 10. Limit retaining ring, 11. Annular lining plate, 12. Limit sleeve, 13. Gas sensor, 14. Power cut-off instrument, 15. High-pressure gas solenoid valve, 16. Main switch valve, 17. Pressurized air pipeline, 18. Drill pipe. Specific implementation mode

[0023] The following further elaborates on the present application in combination with specific embodiments. Those not elaborated in detail in the following embodiments of the present application are all prior arts. Therefore, the structures and connections will not be elaborated.

[0024] Embodiment 1

[0025] As shown in the figure, this embodiment discloses an integrated device for safety protection during coal mine underground drilling construction, including a pipe body 1 and a sealing assembly, a piston assembly, and a coal dropping assembly sequentially arranged inside the pipe body 1. Among them, the pipe body 1 is composed of three sections, including an orifice pipe 101, a cylinder pipe 102, and a sealing hole pipe 103 connected in sequence. An end cover 2 is arranged at the tail end of the pipe body 1, and the head end of the pipe body 1 is a coal powder inlet; the sealing assembly includes an annular balloon 3. One side of the annular balloon 3 abuts against the end cover 2, and the other side extends into the inner cavity of the pipe body 1. And in the natural state, the inner diameter of the central hole of the annular balloon 3 is larger than the outer diameter of the drill pipe 18 for drilling; the piston assembly includes a piston rod 4 and a piston ring 5 sleeved on the outer periphery of the piston rod 4. The main body of the piston rod 4 is arranged inside the cylinder pipe 102, and both ends of the piston rod 4 penetrate through the cylinder pipe 102 respectively, so that the cylinder pipe 102, the piston rod 4, and the piston ring 5 jointly form a piston cylinder structure. A central hole 41 for the drill pipe 18 to pass through is opened in the center of the piston rod 4. A push plate 6 that abuts against the annular balloon 3 is arranged at the tail end of the piston rod 4. A central hole adapted to the piston rod 4 and for the drill pipe 18 to pass through is arranged in the center of the push plate 6. The annular balloon 3 and the push plate 6 are arranged inside the orifice pipe 101. An air inlet 7 for entering high-pressure gas to push the piston ring 5 and the piston rod 4 to displace towards the annular balloon 3 is arranged on the pipe body 1. After high-pressure gas is connected, the push plate 6 squeezes the annular balloon 3 to form a seal around the drill pipe 18; the coal dropping assembly is located inside the sealing hole pipe 103, and the coal dropping assembly includes a coal dropping hole 8 and a coal dropping outlet 9. The coal dropping hole 8 is opened at the bottom of the piston rod 4 near the head end, and the coal dropping outlet 9 is arranged at the bottom of the pipe body 1. And in the natural state, the coal dropping hole 8 and the coal dropping outlet 9 are correspondingly communicated in position. After high-pressure air is connected to the air inlet 7, the displacement of the piston rod 4 closes the coal dropping outlet 9.

[0026] In this embodiment, the orifice tube 101 and the cylinder tube 102 , as well as the cylinder tube 102 and the sealing tube 103 are sealed by flanges.

[0027] In addition, if Figure 1 As shown, the inner diameters of the orifice tube 101, the cylinder tube 102 and the sealing tube 103 are gradually reduced in sequence, and the inner diameter of the sealing tube 103 is adapted to the outer diameter of the drill pipe 18, the outer diameter of the sealing tube 103 is adapted to the inner diameter of the downhole borehole, the outer diameter of the piston ring 5 is adapted to the inner diameter of the cylinder tube 102, and the outer diameter of the annular balloon 3 is adapted to the inner diameter of the orifice tube 101.

[0028] In actual application, this embodiment also requires the following supporting installations:

[0029] That is, if Figure 2 and Figure 3 As shown, the device also includes a gas sensor 13, a power cutoff device 14 and a high-pressure gas solenoid valve 15. There are two gas sensors 13, which are respectively arranged in the underground tunnel and the borehole, and the gas sensors 13 are connected to the input end interface of the power cutoff device 14. One output end interface of the power cutoff device 14 is connected to the main switch valve 16 of the underground drilling rig, and the other output end interface is connected to the high-pressure gas solenoid valve 15. The interface of the high-pressure gas solenoid valve 15 is connected to the compressed air pipeline 17 in the tunnel, and the output port of the high-pressure gas solenoid valve 15 is connected to the air inlet 7, so that when the gas sensor 13 alarms, the main switch valve 16 is cut off and the high-pressure gas solenoid valve 15 is opened, so that the coal falling assembly is closed and the sealing assembly seals the drill pipe 18.

[0030] The basic principles of this embodiment in practical application are as follows:

[0031] During the initial phase, which is the normal construction drilling phase:

[0032] like Figure 2 As shown, the drill rod 18 passes through the device from the center hole of the end cover 2 at the rear end of the device, passes through the end of the sealing tube 103 at the head end of the device, and is placed in the drilling construction operation; in this state, the piston rod 4 is in its initial original position, and it does not apply any force to the annular balloon 3. At the same time, there is sufficient gap space between the center hole of the annular balloon 3 and the drill rod 18 for the drill rod to rotate. After the drill rod drills the hole, the removed coal powder will be discharged through the coal drop hole 8 and the coal drop outlet 9.

[0033] During the security protection phase:

[0034] like Figure 3As shown, when gas leakage causes the gas concentration in the borehole or tunnel to exceed the standard, the gas sensor 13 will alarm immediately and transmit the over-limit signal to the power-off device 14, and through the power-off device 14, the main switch valve 16 of the coal mine underground drilling rig is closed, and the drilling rig is shut down; at the same time, the high-pressure gas solenoid valve 15 is opened, and the high-pressure gas in the underground compressed air pipeline 17 is sent to the air inlet 7 through the high-pressure gas solenoid valve 15. Under the action of the high-pressure gas, the piston rod 4 moves toward the tail end, and then squeezes the annular balloon 3 through the push plate 6, so that the annular balloon 3 is compressed, and its center hole is reduced and close to the outer circumference of the drill rod 18 to form an embracing seal for the drill rod 18; in addition, the displacement of the piston rod 4 forms a staggered seal between the coal drop hole 8 and the coal drop outlet 9, thereby completing the sealing of the coal drop mouth, and realizing all-round sealing of the borehole mouth as a whole, effectively preventing gas leakage.

[0035] Based on the above working principle, this embodiment further provides a method for gas protection using the above-mentioned coal mine underground drilling construction safety protection integrated device of this embodiment:

[0036] First, a gas sensor 13 is arranged in the borehole, and another gas sensor 13 is arranged in the tunnel near the working area of the drilling rig; secondly, the integrated safety protection device is sleeved on the tail end of the drill pipe, and the head end of the pipe body 1, that is, the head end part of the sealing pipe 103, is placed in the borehole and fixed, and the connection of each pipeline interface is completed; finally, the drilling rig is started for drilling operation. If a gas leak occurs, the drilling rig will cut off the power supply and stop working immediately under the control of the power cut-off device 14. At the same time, the integrated safety protection device is triggered to start, the drill pipe is tightly sealed, and the coal drop outlet 9 is closed, thereby forming an all-round seal on the borehole opening.

[0037] Example 2

[0038] The technical solutions of this embodiment are basically consistent with those of embodiment 1, with the only difference being that a limit ring 10 is fixedly sleeved on the outer circumference of the sealing tube 103. The limit ring 10 is used to limit the maximum length of the sealing tube 103 extending into the borehole, and can also serve as a sealing structure for the outer circumference of the borehole opening, thereby forming a seal on the circumferential gap of the borehole opening.

[0039] Specifically, a circle of rubber sealing strip is set on the side wall of the limit ring 10 facing the drill hole, and a circle of sealing bristles is set on the side wall of the sealing strip facing the drill hole. After the sealing bristles are on the outer circumference of the drill hole, a peripheral seal is formed at the drill hole opening.

[0040] Alternatively, in addition to the above, any other existing sealing structure that can achieve peripheral sealing of the hole opening is set on the side wall of the limit ring 10 facing the drill hole. It can be selected according to actual conditions and will not be described here.

[0041] Example 3

[0042] The technical solution of this embodiment is basically the same as that of Embodiment 1. The only difference is that: an annular lining plate 11 is further provided at the inner end of the pipe body 1. One side of the annular lining plate 11 abuts against the cover plate 2, and the other end abuts against and supports the annular balloon 3. The function of the annular lining plate 11 is to improve the sealing effect of the annular balloon 3 on the drill pipe 18 after being squeezed and deformed, and it is equivalent to a cushion seat for the annular balloon 3 to abut against and support.

[0043] Example 4

[0044] The technical solution of this embodiment is basically the same as that of Embodiment 1. The only difference is that: a limiting sleeve 12 for preventing the push plate 6 from excessively squeezing the annular balloon 3 is provided at the circumferential inner wall of the pipe body 1 corresponding to the annular balloon 3. The inner diameter of the limiting sleeve 12 is smaller than the outer diameter of the push plate 6, and the distance between the limiting sleeve 12 and the push plate 6 constitutes the maximum displacement stroke of the push plate 6. As described above, when the air inlet 7 accesses high-pressure gas instantaneously, if the accessed pressure is overloaded and the instantaneous force pushing the piston rod 4 and the push plate 6 is too large, resulting in an overload of the instantaneous force received by the annular balloon 3, the annular balloon 3 may be damaged. However, the presence of the limiting sleeve 12 can effectively avoid the occurrence of the above situation and always ensure the normal use of the annular balloon 3.

[0045] Example 5

[0046] As Figure 4 and 5 shown, the technical solution of this embodiment is basically the same as that of Embodiment 1. The only difference is that: a sealing hole capsule 19 is sleeved on the outer circumference of the pipe body of the sealing hole pipe 103, and an air inlet pipeline 71 is hidden inside the pipe wall of the sealing hole pipe 103, inside the flange connection end, and inside the pipe wall of the cylinder pipe 102. One end of the air inlet pipeline 71 is connected to the air inlet 7, and the other end is connected to the inlet of the sealing hole capsule 19, so that after the air inlet 7 accesses high-pressure gas, while the piston rod 4 is displaced, the sealing hole capsule 19 expands in the drill hole to form a seal for the tiny gap between the drill pipe and the sealing hole pipe 103.

[0047] The above are the preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above content. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement methods and are all included in the protection scope of the present invention.

Claims

1. An integrated safety protection device for borehole construction in coal mines, characterized in that: It comprises a tube body (1) and a sealing assembly, a piston assembly and a coal dropping assembly sequentially arranged in the tube body (1), wherein the tail end of the tube body (1) is provided with an end cover (2), and the head end of the tube body (1) is a coal powder inlet; The sealing assembly comprises an annular balloon (3), one side of the annular balloon (3) is in contact with the end cap (2), and the other side extends toward the inner cavity of the tube body (1), and in a natural state, the inner diameter of the central hole of the annular balloon (3) is larger than the outer diameter of the drill rod (18) used for drilling; The piston assembly includes a piston rod (4) and a piston ring (5) sleeved on the outer periphery of the piston rod (4); a center hole (41) for the drill rod (18) to pass through is opened in the center of the piston rod (4); a push plate (6) is provided at the rear end of the piston rod (4) to abut against the annular balloon (3); an air inlet (7) is provided on the tube body (1) for entering high-pressure gas to push the piston ring (5) and the piston rod (4) toward the annular balloon (3), so that after the high-pressure gas is connected, the push plate (6) squeezes the annular balloon (3) to form a seal on the outer periphery of the drill rod (18); The coal dropping assembly comprises a coal dropping hole (8) and a coal dropping outlet (9), wherein the coal dropping hole (8) is provided at the bottom of the piston rod (4) near the head end, and the coal dropping outlet (9) is provided at the bottom of the tube body (1), and in a natural state, the coal dropping hole (8) and the coal dropping outlet (9) are connected at corresponding positions, and after the air inlet (7) is connected to high-pressure air, the piston rod (4) is displaced to close the coal dropping outlet (9).

2. The integrated safety protection device for borehole construction in coal mines according to claim 1, wherein: The tube body (1) comprises an orifice tube (101), a cylinder tube (102) and a sealing tube (103) connected in sequence; the main body of the piston rod (4) is arranged in the cylinder tube (102); both ends of the piston rod (4) respectively pass through the cylinder tube (102), so that the cylinder tube (102), the piston rod (4) and the piston ring (5) together form a piston cylinder structure; the annular sac (3) and the push plate (6) are arranged in the orifice tube (101); and the coal dropping assembly is located in the sealing tube (103).

3. An integrated safety protection device for underground coal mine drilling construction according to claim 2, characterized in that: The orifice tube (101) and the cylinder tube (102), as well as the cylinder tube (102) and the sealing tube (103) are sealed and connected via flanges.

4. The integrated safety protection device for underground coal mine drilling construction according to claim 2, wherein: The inner diameters of the orifice tube (101), the cylinder tube (102) and the sealing tube (103) are gradually reduced in sequence, and the inner diameter of the sealing tube (103) is adapted to the outer diameter of the drill rod (18), the outer diameter of the sealing tube (103) is adapted to the inner diameter of the downhole borehole, the outer diameter of the piston ring (5) is adapted to the inner diameter of the cylinder tube (102), and the outer diameter of the annular balloon (3) is adapted to the inner diameter of the orifice tube (101).

5. The integrated safety protection device for borehole construction in coal mines according to claim 2, wherein: The outer circumference fixed sleeve of the sealing tube (103) is provided with a limit ring (10).

6. The integrated safety protection device for underground coal mine drilling construction according to claim 1, characterized in that: An annular lining plate (11) is further provided at the inner tail end of the tube body (1), with one side of the annular lining plate (11) resting against the cover plate (2) and the other end resting against and supporting the annular balloon (3).

7. An integrated safety protection device for borehole construction in coal mines as described in claim 1, characterized in that: A limiting sleeve (12) is provided on the circumferential inner wall of the tube body (1) at the position of the annular balloon (3) for preventing the push plate (6) from excessively squeezing the annular balloon (3). The inner diameter of the limiting sleeve (12) is smaller than the outer diameter of the push plate (6), and the distance between the limiting sleeve (12) and the push plate (6) constitutes the maximum displacement stroke of the push plate (6).

8. The integrated safety protection device for borehole construction in coal mines according to claim 1, characterized in that: The center of the push plate (6) is provided with a center hole adapted to the piston rod (4) for the drill rod (18) to pass through.

9. The integrated safety protection device for borehole construction in coal mines according to claim 1, characterized in that: The device further comprises a gas sensor (13), a power cut-off device (14) and a high-pressure gas solenoid valve (15). Two gas sensors (13) are provided, which are respectively provided in an underground tunnel and a borehole, and both gas sensors (13) are connected to the input end interface of the power cut-off device (14). One output end interface of the power cut-off device (14) is connected to the main switch valve (16) of the underground drilling rig, and the other output end interface is connected to the high-pressure gas solenoid valve (15). The interface of the high-pressure gas solenoid valve (15) is connected to the compressed air pipeline (17) in the tunnel, and the output port of the high-pressure gas solenoid valve (15) is connected to the air inlet (7). When the gas sensor (13) alarms, the main switch valve (16) is cut off and the high-pressure gas solenoid valve (15) is opened, so that the coal drop assembly is closed and the sealing assembly seals the drill pipe (18).

10. A method for gas protection using the integrated device for safety protection during coal mine underground drilling construction as described in any one of claims 1-9, characterized in that: First, a gas sensor (13) is arranged in the borehole, and another gas sensor (13) is arranged in the tunnel near the working area of the drilling rig; secondly, the safety protection integrated device is sleeved on the tail end of the drill pipe, and the head end of the pipe body (1), that is, the head end part of the sealing pipe (103), is placed in the borehole and fixed, and the connection of each pipeline interface is completed; finally, the drilling rig is started to perform drilling operations. If a gas leak occurs, the drilling rig will immediately cut off the power supply and stop working under the control of the power cut-off device (14). At the same time, the safety protection integrated device is triggered to start, tightly seal the drill pipe, and close the coal drop outlet (9), thereby forming an all-round seal for the borehole opening.

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