Gas extraction drilling pipe network pressure relief early warning device and method

Abstract

The invention discloses a gas extraction drilling pipe network pressure relief early warning device and method.According to the gas extraction drilling pipe network pressure relief early warning method, when the situation that a pipe is blocked occurs, gas in the pipe is gathered, and then gas pressure is increased, and when the pressure is increased to the compression threshold value of a spring in a pressure relief early warning valve, the pressure relief early warning valve is started; the movable plug valve pushes the spring to move leftwards, the gas enters the pressure relief early warning valve, when the gas flows through the wind buzzer, the wind buzzer makes a sound for early warning, and when the gas continues to be pushed leftwards, the hinged cover can be blown open, the gas gathering pressure is released, and after the pressure in the pipe is lower than the compression threshold value of the spring in the pressure relief early warning valve, the gas enters the pressure relief early warning valve. The gas extraction early warning and pressure relief device has the advantages of being convenient to operate and good in pressure relief early warning effect, and the technical problem that an existing device is poor in economical efficiency and applicability due to the fact that the pressure relief early warning effect is poor is solved.

Description

Technical Field

[0001] The present invention belongs to the field of gas drainage in coal mines. Specifically, it relates to a gas drainage borehole pipe network pressure relief warning device and method. Background Art

[0002] During the coal seam drainage period, the residual coal slag in the drainage boreholes is easily carried by external forces such as flowing gas and coal seam seepage to the orifice, and accumulates and forms a blockage in the multi-way or branch pipe at the orifice, resulting in an increase in the gas pressure in the gas drainage pipe, thereby causing the pipe network around the drainage boreholes to be pulled apart and forming a gas outburst accident due to gas spraying. Especially in high-gas and outburst coal seams with loose and broken coal bodies, the boreholes are prone to caving during the drainage period, further aggravating the risk of blockage of the drainage boreholes and the pipe network.

[0003] In response to the above problems, the mine generally adopts a gas drainage monitoring and warning control system, which realizes real-time monitoring and control of the gas in the boreholes during the gas drainage process through a series of devices such as sensors, monitors, and control devices to prevent the occurrence of gas outburst accidents. However, this method of preventing gas outburst by equipping a variety of different devices is generally complex and cumbersome as a whole, and the cost of a complete set of devices is relatively high. If the devices malfunction, it will further increase the overall cost, and thus the overall practicality and economy of this gas drainage monitoring and warning control system are relatively low. Therefore, a gas drainage borehole pipe network pressure relief warning device and method with good anti-blowout effect, strong practicality, and high economy are needed. Summary of the Invention

[0004] The purpose of the present invention is to provide a gas drainage borehole pipe network pressure relief warning device and method with good anti-blowout effect, strong practicality, and high economy. Through structural innovation, the gas drainage pressure relief warning function and the pressure self-adjustment function are realized, ensuring that on the premise of effectively preventing the occurrence of gas outburst accidents, the prevention work of gas outburst during gas drainage is more economical and practical, so as to improve the overall efficiency.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions: A gas drainage borehole pipe network pressure relief warning device, including a multi-way pipe with a valve, a pressure relief warning valve, and several drainage branch pipes. The pressure relief warning valve is installed at one port of the multi-way pipe with a valve and is connected to the multi-way pipe with a valve. The other ports of the multi-way pipe with a valve are all connected with drainage branch pipes; The pressure relief warning valve includes a warning valve body, a hinged cover, a siren, a connection base, a spring, a movable plug valve, and an external thread joint; the external thread joint is arranged at the right end of the warning valve body, and the hinged cover is arranged at the left end of the warning valve body. The warning valve body includes a first hollow body and a second hollow body. Both the first hollow body and the second hollow body are hollow cylinders, and the outer diameter of the first hollow body is smaller than that of the second hollow body. A first channel is formed inside the first hollow body, and a second channel and a third channel that are connected to each other are formed inside the second hollow body. The external thread joint includes a third hollow body, an external thread portion is arranged on the outer surface of the third hollow body, and a fourth channel is formed inside the third hollow body. The first channel, the second channel, the third channel, and the fourth channel are interconnected to form an installation channel. The first channel, the second channel, and the fourth channel are all cylindrical channels, and the third channel is a frustum-shaped channel. The left end of the third channel has the same diameter as the second channel, the right end of the third channel has the same diameter as the fourth channel, the diameter of the first channel is the same as that of the second channel, and the diameter of the fourth channel is smaller than that of the second channel; The siren, the connection base, the spring, and the movable plug valve are arranged in the installation channel in sequence from left to right. The spring is horizontally arranged at the right end of the connection base, and the movable plug valve is connected to the right end of the spring.

[0006] The hinged cover includes a cover body, and a first hinged portion and a second hinged portion are arranged on the cover body. Hinged supports corresponding to the first hinged portion and the second hinged portion are arranged at the left end of the pressure relief warning valve. The cover body is hinged to the pressure relief warning valve through a hinge shaft inserted into the first hinged portion, the second hinged portion, and the hinged supports.

[0007] The siren includes a whistle main body, which is horizontally arranged left and right. The right end of the whistle main body is the air inlet end. A plurality of first sector-shaped supports are arranged on the outer surface of the whistle main body along the circumference. The outer end surface of the first sector-shaped support is an arc surface corresponding to the inner wall of the pressure relief warning valve, and the inner end surface of the first sector-shaped support is an arc surface corresponding to the outer surface of the whistle main body. A first limiting groove corresponding to the first sector-shaped support is arranged on the inner wall of the installation channel.

[0008] The connection base includes a horizontally arranged cylinder, which is coaxially arranged with the siren. A plurality of second sector-shaped supports are arranged on the outer surface of the cylinder along the circumference. The outer end surface of the second sector-shaped support is an arc surface corresponding to the inner wall of the pressure relief warning valve, and the inner end surface of the second sector-shaped support is an arc surface corresponding to the outer surface of the cylinder. Vertically symmetric vertical circular holes are arranged on the cylinder. The left end of the spring is installed on the cylinder through a limiting column inserted into the vertical circular holes. A second limiting groove corresponding to the second sector-shaped support is arranged on the inner wall of the installation channel.

[0009] The movable plug valve includes a sphere, a connection pillar is arranged at the left end of the sphere, the connection pillar is connected to the right end of the spring, and the diameter of the sphere is the same as that of the fourth channel.

[0010] The valve-equipped multi-way pipe is a three-way pipe or a four-way pipe. The three-way pipe includes a horizontally arranged manifold pipe. A branch pipe is provided on the manifold pipe. A connecting pipe is provided on the branch pipe. An internal thread joint corresponding to an external thread joint is provided on the connecting pipe. The pressure relief warning valve is threadedly connected to the connecting pipe through the external thread joint and the internal thread joint. A drainage valve is also provided on the branch pipe. The drainage valve is located below the connecting pipe. The structure of the four-way pipe adds a branch pipe to the manifold pipe of the three-way pipe.

[0011] The gas drainage borehole network pressure relief warning method is implemented based on the above gas drainage borehole network pressure relief warning device, and includes the following steps: (1) Assemble the gas drainage borehole network pressure relief warning device and install the gas drainage borehole network pressure relief warning device on the drainage pipeline; (2) Start the drainage work. When the gas pressure in the pipe increases, the gas drainage borehole network pressure relief warning device starts to work.

[0012] The specific operation process of step (1) is as follows: First, install the pressure relief warning valve on the connecting pipe of the valve-equipped multi-way pipe through the external thread joint and the internal thread joint. Then, install extraction branch pipes on all other ports of the valve-equipped multi-way pipe. The extraction branch pipe on the manifold pipe of the valve-equipped multi-way pipe is directly connected to the gas drainage device. A main drainage pipe is also connected to the gas drainage device. The extraction branch pipe on the branch pipe of the valve-equipped multi-way pipe is connected to the main drainage pipe. In the initial state, the movable plug valve blocks the fourth passage.

[0013] First, open the drainage valve on the valve-equipped multi-way pipe, and then start the gas drainage device to start gas drainage. During the process of gas drainage from the coal seam, if the pipe is blocked, it will cause gas accumulation in the pipe, which will in turn lead to an increase in gas pressure. When the pressure increases to the compression threshold of the spring in the pressure relief warning valve, the movable plug valve pushes the spring to move leftward, and gas enters the pressure relief warning valve. When the gas flows through the buzzer, the buzzer makes a sound for warning. When the gas continues to push leftward, it will blow open the hinged cover, and the pressure of the accumulated gas is released. After the pressure in the pipe is lower than the compression threshold of the spring in the pressure relief warning valve, the spring resets and pushes the movable plug valve back to the initial state.

[0014] The gas drainage borehole network pressure relief warning device of the present application realizes the warning function through the alarm sound of the buzzer and reminds the staff to handle it in time. Moreover, through the combined movement of the spring and the movable plug valve, the hinged cover is pushed open to achieve the pressure relief effect and reduce the probability of hole spraying.

[0015] In the gas drainage borehole pipe network pressure relief warning method of the present application, if a blockage occurs in the pipe, it will cause the gas to accumulate in the pipe, resulting in an increase in gas pressure. When the pressure increases to the compression threshold of the spring in the pressure relief warning valve, the movable plug valve pushes the spring to move to the left, and the gas enters the pressure relief warning valve. When the gas flows through the buzzer, the buzzer makes a sound for warning. When the gas continues to push to the left, it will blow open the hinged cover, and the pressure of the accumulated gas is released. After the pressure in the pipe is lower than the compression threshold of the spring in the pressure relief warning valve, the spring resets and pushes the movable plug valve back to the initial state, thus realizing the warning and pressure relief functions of gas drainage, with the characteristics of convenient operation and good pressure relief warning effect, and solving the technical problems of poor pressure relief warning effect and poor economy and applicability of the existing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a working schematic diagram of the gas drainage borehole pipe network pressure relief warning device of the present invention.

[0017] Figure 2 It is a structural schematic diagram of the pressure relief warning valve of the present invention.

[0018] Figure 3 It is Figure 2 A cross-sectional view of the A-A part of

[0019] Figure 4 It is a structural schematic diagram of the warning valve body and the external thread joint of the present invention.

[0020] Figure 5 It is Figure 4 A cross-sectional view of the B-B part in

[0021] Figure 6 It is a structural schematic diagram of the hinged cover of the present invention.

[0022] Figure 7 It is a structural schematic diagram of the buzzer of the present invention.

[0023] Figure 8 It is a structural schematic diagram of the connection base of the present invention.

[0024] Figure 9 It is a structural schematic diagram of the movable plug valve of the present invention.

[0025] Figure 10 It is a structural schematic diagram of the valve-equipped multi-way pipe as a three-way pipe of the present invention.

[0026] Figure 11 It is Figure 10 A partial cross-sectional view of

[0027] Figure 12 It is a structural schematic diagram of the valve-equipped multi-way pipe as a four-way pipe of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0028] The embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0029] Embodiment 1 As Figures 1-12 shown, the gas drainage borehole network pressure relief warning device includes a valve multi-pass pipe 1, a pressure relief warning valve 2, and several extraction branch pipes 3. The pressure relief warning valve 2 is installed at one port of the valve multi-pass pipe 1 and communicates with the valve multi-pass pipe 1. The other ports of the valve multi-pass pipe 1 are all connected with extraction branch pipes 3; The pressure relief warning valve 2 includes a warning valve main body 4, a hinged cover 5, a wind siren 6, a connection base 7, a spring 8, a movable plug valve 9, and an external thread joint 10; the external thread joint 10 is arranged at the right end of the warning valve main body 4, and the hinged cover 5 is arranged at the left end of the warning valve main body 4. The warning valve main body 4 includes a first hollow body and a second hollow body. Both the first hollow body and the second hollow body are hollow cylinders, and the outer diameter of the first hollow body is smaller than the outer diameter of the second hollow body. A first channel is formed inside the first hollow body, and a second channel and a third channel that are connected to each other are formed inside the second hollow body. The external thread joint 10 includes a third hollow body. An external thread portion is arranged on the outer surface of the third hollow body, and a fourth channel is formed inside the third hollow body. The first channel, the second channel, the third channel, and the fourth channel are connected to each other to form an installation channel 11. The first channel, the second channel, and the fourth channel are all cylindrical channels, and the third channel is a frustum-shaped channel. The left end of the third channel has the same diameter as the second channel, the right end of the third channel has the same diameter as the fourth channel, the diameter of the first channel is the same as the diameter of the second channel, and the diameter of the fourth channel is smaller than the diameter of the second channel; the length of the warning valve main body 4 is 80 mm, the outer diameter is 30 mm, the inner diameter is 18 mm to 22 mm, the axial length of the first hollow body is 10 mm, the outer diameter is 27 mm, and the axial length of the second hollow body is 70 mm, the outer diameter is 30 mm; the diameter of the third hollow body is 18 mm; The wind siren 6, the connection base 7, the spring 8, and the movable plug valve 9 are arranged in the installation channel 11 in sequence from left to right. The spring 8 is horizontally arranged at the right end of the connection base 7, and the movable plug valve 9 is connected to the right end of the spring 8.

[0030] The hinged cover 5 includes a cover body 12. The cover body 12 is provided with a first hinge portion 13 and a second hinge portion 14. Corresponding hinge supports 15 for the first hinge portion 13 and the second hinge portion 14 are arranged at the left end of the pressure relief warning valve 2. The cover body 12 is hinged to the pressure relief warning valve 2 through a hinge shaft inserted into the first hinge portion 13, the second hinge portion 14, and the hinge support 15. An inner groove 16 is formed at the right end of the cover body 12. The inner diameter of the inner groove 16 is the same as the outer diameter of the pressure relief warning valve, and the depth of the inner groove 16 is 2 / 5 of the thickness of the entire cover body 12. The thickness of the cover body 12 is 5 mm.

[0031] The air whistle 6 includes a wind whistle body 17 which is horizontally arranged left and right. The right end of the wind whistle body 17 is the air inlet end. A plurality of first sector-shaped supports 18 are arranged on the outer surface of the wind whistle body 17 along the circumference. The outer end surface of the first sector-shaped support 18 is an arc surface corresponding to the inner wall of the pressure relief warning valve 2, and the inner end surface of the first sector-shaped support 18 is an arc surface corresponding to the outer surface of the wind whistle body 17. A first limiting groove 19 corresponding to the first sector-shaped support 18 is arranged on the inner wall of the installation channel 11.

[0032] The connecting base 7 includes a horizontally arranged cylinder 20 which is coaxially arranged with the air whistle 6. A plurality of second sector-shaped supports 21 are arranged on the outer surface of the cylinder 20 along the circumference. The outer end surface of the second sector-shaped support 21 is an arc surface corresponding to the inner wall of the pressure relief warning valve 2, and the inner end surface of the second sector-shaped support 21 is an arc surface corresponding to the outer surface of the cylinder 20. Vertically symmetrical vertical circular holes 22 are arranged on the cylinder 20. The left end of the spring 8 is installed on the cylinder 20 through a limiting post inserted into the vertical circular hole 22. A second limiting groove 23 corresponding to the second sector-shaped support 21 is arranged on the inner wall of the installation channel 11. The maximum outer diameter of the cylinder 20 is 6 mm.

[0033] The movable plug valve 9 includes a sphere 24. A connecting support column 25 is arranged at the left end of the sphere 24, and the connecting support column 25 is connected to the right end of the spring 8. The diameter of the sphere 24 is the same as the diameter of the fourth channel.

[0034] The valve-equipped multi-way pipe 1 is a three-way pipe or a four-way pipe. The three-way pipe includes a horizontally arranged manifold pipe 26. A branch pipe 27 is arranged on the manifold pipe 26. A connecting pipe 28 is arranged on the branch pipe 27. An internal thread joint 29 corresponding to the external thread joint 10 is arranged on the connecting pipe 28. The pressure relief warning valve 2 is threadedly connected to the connecting pipe 28 through the external thread joint 10 and the internal thread joint 29. A drainage valve 30 is also arranged on the branch pipe 27, and the drainage valve 30 is located below the connecting pipe 28. The structure of the four-way pipe adds a branch pipe 27 to the manifold pipe 26 of the three-way pipe. The branch pipe 27 is connected to the in-hole drainage branch pipe 3 through the drainage branch pipes 3 with the same radial dimension but different axial lengths and the supporting connectors. The manifold pipe 26 is similarly connected to the drainage branch pipes 3 with the same radial dimension but different axial lengths and the supporting connectors respectively.

[0035] The pressure relief warning device for the gas drainage borehole pipe network of this application realizes the warning function through the alarm sound of the air whistle 6 and reminds the staff to deal with it in time. Moreover, through the combined movement of the spring 8 and the movable plug valve 9, the hinged cover 5 is pushed open to achieve the pressure relief effect and reduce the probability of borehole outburst.

[0036] Embodiment 2 The pressure relief warning method for the gas drainage borehole pipe network is implemented based on the above pressure relief warning device for the gas drainage borehole pipe network, and includes the following steps: (1)Assemble the gas drainage borehole network pressure relief warning device and install the gas drainage borehole network pressure relief warning device on the drainage pipeline; (2)Start the drainage work. When the gas pressure in the pipe increases, the gas drainage borehole network pressure relief warning device starts to work.

[0037] The specific operation process of step (1) is as follows: First, install the pressure relief warning valve 2 on the connecting pipe 28 of the multi-way pipe 1 with a valve through the external thread joint 10 and the internal thread joint 29. Then, install the extraction branch pipes 3 on all other ports of the multi-way pipe 1 with a valve. The extraction branch pipe 3 on the manifold pipe 26 of the multi-way pipe 1 with a valve is directly connected to the gas drainage device 31. The gas drainage device 31 is also connected with an extraction main pipe 32. The extraction branch pipe 3 on the branch pipe 27 of the multi-way pipe 1 with a valve is connected to the extraction main pipe 32. In the initial state, the movable plug valve 9 blocks the fourth passage.

[0038] First, open the extraction valve 30 on the multi-way pipe 1 with a valve, and then start the gas drainage device 31 to start gas drainage. During the process of extracting gas from the coal seam 33, if the pipe is blocked, it will cause the gas to accumulate in the pipe, which will lead to an increase in gas pressure. When the pressure increases to the compression threshold of the spring 8 in the pressure relief warning valve 2, the movable plug valve 9 pushes the spring 8 to move leftward, and the gas enters the pressure relief warning valve 2. When the gas flows through the buzzer 6, the buzzer 6 makes a sound for warning. When the gas continues to push leftward, it will blow open the hinged cover 5, and the pressure of the accumulated gas is released. After the pressure in the pipe is lower than the compression threshold of the spring 8 in the pressure relief warning valve 2, the spring 8 resets and pushes the movable plug valve 9 back to the initial state.

[0039] In the gas drainage borehole network pressure relief warning method of this application, when the pipe is blocked, it will cause the gas to accumulate in the pipe, which will lead to an increase in gas pressure. When the pressure increases to the compression threshold of the spring 8 in the pressure relief warning valve 2, the movable plug valve 9 pushes the spring 8 to move leftward, and the gas enters the pressure relief warning valve 2. When the gas flows through the buzzer 6, the buzzer 6 makes a sound for warning. When the gas continues to push leftward, it will blow open the hinged cover 5, and the pressure of the accumulated gas is released. After the pressure in the pipe is lower than the compression threshold of the spring 8 in the pressure relief warning valve 2, the spring 8 resets and pushes the movable plug valve 9 back to the initial state. Thus, the warning and pressure relief functions of gas drainage are realized, which has the characteristics of convenient operation and good pressure relief warning effect, and solves the technical problems of poor pressure relief warning effect of the existing device, resulting in poor economy and applicability.

[0040] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: Still, the present invention can be modified or equivalently replaced, and any modification or partial replacement without departing from the spirit and scope of the present invention shall be covered by the scope of the claims of the present invention.

Claims

1. Gas drainage borehole network pressure relief early warning device, characterized in that: It includes a multi-way valve pipe with a valve, a pressure relief warning valve, and several extraction branch pipes. The pressure relief warning valve is installed at one port of the multi-way valve pipe with a valve and is connected to the multi-way valve pipe with a valve. The other ports of the multi-way valve pipe with a valve are all connected with extraction branch pipes; The pressure relief warning valve includes a warning valve body, a hinged cover, a siren, a connecting base, a spring, a movable plug valve, and an external thread joint; The external thread joint is arranged at the right end of the warning valve body, and the hinged cover is arranged at the left end of the warning valve body. The warning valve body includes a first hollow body and a second hollow body. Both the first hollow body and the second hollow body are hollow cylinders, and the outer diameter of the first hollow body is smaller than that of the second hollow body. A first channel is formed inside the first hollow body, and a second channel and a third channel that are connected to each other are formed inside the second hollow body. The external thread joint includes a third hollow body, an external thread portion is arranged on the outer surface of the third hollow body, and a fourth channel is formed inside the third hollow body. The first channel, the second channel, the third channel, and the fourth channel are connected to each other to form an installation channel. The first channel, the second channel, and the fourth channel are all cylindrical channels, and the third channel is a frustum-shaped channel. The left end of the third channel has the same diameter as the second channel, the right end of the third channel has the same diameter as the fourth channel, the diameter of the first channel is the same as that of the second channel, and the diameter of the fourth channel is smaller than that of the second channel; The siren, the connecting base, the spring, and the movable plug valve are arranged in the installation channel in sequence from left to right. The spring is horizontally arranged at the right end of the connecting base, and the movable plug valve is connected to the right end of the spring.

2. The gas drainage borehole network pressure relief warning device according to claim 1, wherein: The hinged cover includes a cover body. A first hinged portion and a second hinged portion are arranged on the cover body. Hinged supports corresponding to the first hinged portion and the second hinged portion are arranged at the left end of the pressure relief warning valve. The cover body is hinged to the pressure relief warning valve through a hinge shaft inserted on the first hinged portion, the second hinged portion, and the hinged supports.

3. The gas drainage borehole network pressure relief warning device according to claim 2, wherein: The siren includes a whistle body. The whistle body is horizontally arranged left and right. The right end of the whistle body is the air inlet end. A plurality of first sector supports are arranged on the outer surface of the whistle body along the circumference. The outer end surface of the first sector support is an arc surface corresponding to the inner wall of the pressure relief warning valve, and the inner end surface of the first sector support is an arc surface corresponding to the outer surface of the whistle body. A first limiting groove corresponding to the first sector support is arranged on the inner wall of the installation channel.

4. The gas drainage borehole network pressure relief warning device according to claim 3, characterized in that: The connecting base includes a horizontally arranged cylinder. The cylinder is coaxially arranged with the siren. A plurality of second sector supports are arranged on the outer surface of the cylinder along the circumference. The outer end surface of the second sector support is an arc surface corresponding to the inner wall of the pressure relief warning valve, and the inner end surface of the second sector support is an arc surface corresponding to the outer surface of the cylinder. Vertically symmetrical vertical circular holes are arranged on the cylinder. The left end of the spring is installed on the cylinder through a limiting post inserted in the vertical circular hole. A second limiting groove corresponding to the second sector support is arranged on the inner wall of the installation channel.

5. The gas drainage borehole network pressure relief warning device according to claim 4, characterized in that: The movable plug valve includes a sphere. A connecting pillar is arranged at the left end of the sphere. The connecting pillar is connected to the right end of the spring. The diameter of the sphere is the same as that of the fourth channel.

6. The gas drainage borehole pipe network pressure relief warning device according to claim 5, wherein: The valve-equipped multi-way pipe is a three-way pipe or a four-way pipe. The three-way pipe includes a header pipe arranged horizontally. A branch pipe is provided on the header pipe. A connecting pipe is provided on the branch pipe. An internal thread joint corresponding to an external thread joint is provided on the connecting pipe. The pressure relief warning valve is threadedly connected to the connecting pipe through the external thread joint and the internal thread joint. A drainage valve is also provided on the branch pipe. The drainage valve is located below the connecting pipe. The structure of the four-way pipe adds a branch pipe to the header pipe of the three-way pipe.

7. A method for warning of pressure relief in a gas drainage borehole pipe network, which is implemented based on the gas drainage borehole pipe network pressure relief warning device described in any one of claims 1 to 6, characterized in that, It includes the following steps: (1) Assemble the pressure relief warning device for the gas drainage borehole pipe network and install the pressure relief warning device for the gas drainage borehole pipe network on the drainage pipeline; (2) Start the drainage work. When the gas pressure in the pipe increases, the pressure relief warning device for the gas drainage borehole pipe network starts to work.

8. The gas drainage borehole network pressure relief warning method according to claim 7, characterized in that: The specific operation process of step (1) is as follows: First, install the pressure relief warning valve on the connecting pipe of the valve-equipped multi-way pipe through the external thread joint and the internal thread joint. Then, install drainage branch pipes on all other ports of the valve-equipped multi-way pipe. The drainage branch pipe on the header pipe of the valve-equipped multi-way pipe is directly connected to the gas drainage device. A main drainage pipe is also connected to the gas drainage device. The drainage branch pipe on the branch pipe of the valve-equipped multi-way pipe is connected to the main drainage pipe. In the initial state, the movable plug valve blocks the fourth channel.

9. The gas drainage borehole network pressure relief warning method according to claim 8, characterized in that: First, open the drainage valve on the valve-equipped multi-way pipe, and then start the gas drainage by starting the gas drainage device. During the process of draining gas from the coal seam, if the pipe becomes blocked, it will cause the gas in the pipe to accumulate and then lead to an increase in gas pressure. When the pressure increases to the compression threshold of the spring in the pressure relief warning valve, the movable plug valve pushes the spring to move leftward, and the gas enters the pressure relief warning valve. When the gas flows through the buzzer, the buzzer makes a sound for warning. When the gas continues to push leftward, it will blow open the hinged cover, and the pressure of the accumulated gas is released. After the pressure in the pipe is lower than the compression threshold of the spring in the pressure relief warning valve, the spring resets and pushes the movable plug valve back to the initial state.

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