A gas outburst monitoring and alarm device for underground tunneling face

Abstract

A gas outburst monitoring and alarm device for an underground tunneling working face according to the present invention discloses a device for monitoring and warning gas outbursts through multiple indicators such as roadway wind speed and direction, roadway gas concentration, coal seam gas concentration, and coal wall bulging deformation amount, which can improve the accuracy of gas outburst warning. It is characterized by being composed of a main body assembly, a roadway gas concentration detection assembly, and a coal seam gas concentration detection assembly. The main body assembly is composed of a semi-cylindrical pedestal, a wind speed and direction sensor, fixed ears, a diversion groove, and a displacement sensor. There are two fixed ears on the semi-cylindrical pedestal. The semi-cylindrical pedestal is a semi-cylindrical structure, and the diameter of the semi-cylindrical pedestal gradually increases from one side to the other. The two fixed ears are respectively located on both sides of the planar side wall of the semi-cylindrical pedestal. The fixed ears are close to the side of the semi-cylindrical pedestal. A diversion groove is opened on the semi-cylindrical pedestal, and the diversion groove is located on the arc-shaped side wall of the semi-cylindrical pedestal. The width of the diversion groove gradually increases from the middle to both ends.

Description

Technical Field

[0001] A gas outburst monitoring and alarming device for an underground tunneling working face of the present invention relates to a device capable of monitoring and giving an early alarm to the gas outburst in the underground tunneling working face, and belongs to the technical field of coal mine safety. Background Art

[0002] Gas outburst refers to the sudden large-scale ejection of gas from the coal body into the mining space under the action of pressure, which is another type of special gas outburst phenomenon and has great destructiveness. There are omens before each outburst, including abnormal gas emission volume, large and small suddenly, roadway deformation such as roof subsidence, floor heave, and coal wall bulging outward, and coal gun sounds, etc. These signs are often not easy to observe, and it is too late when workers find them. Therefore, it is necessary to monitor and give an early warning to the gas outburst in the underground tunneling working face. Most of the existing gas outburst monitoring and warning devices only monitor single indicators such as the gas concentration in the roadway. However, the omens caused by gas outburst are relatively complex and changeable. Monitoring only a single indicator cannot accurately give an early warning to gas outburst, and it is easy to have false alarms or untimely warnings.

[0003] Publication No. CN104074545B discloses a coal and gas outburst monitoring system and a monitoring method, which includes a ground monitoring system electrically connected to a coal and gas outburst monitoring sub-station. The feature is that the coal and gas outburst monitoring sub-station is electrically connected to a plurality of coal and gas outburst monitoring devices, and the explosion-proof and intrinsically safe power supply supplies power to the coal and gas outburst monitoring sub-station and a plurality of coal and gas outburst monitoring devices; this gas outburst monitoring system only monitors the abnormal gas outburst conditions such as air pressure and gas concentration, and cannot accurately give an early warning to gas outburst, and it is easy to have false alarms or untimely warnings.

[0004] Publication No. CN112343658B discloses a mine coal and gas outburst grading alarm and emergency shelter system based on a GIS platform, including a data processing server and several monitoring system hosts arranged on the ground, and several coal and gas outburst monitoring sub-stations and gas concentration sensors, two-way wind speed and wind direction sensors arranged underground; the coal and gas outburst monitoring sub-stations are all arranged in the mine and are connected to the data processing server and the monitoring system host through the underground ring network; this system only monitors the abnormal gas outburst conditions through two indicators of gas concentration and wind speed, and cannot accurately give an early warning to gas outburst, and it is easy to have false alarms or untimely warnings. Summary of the Invention

[0005] In order to improve the above situation, a gas outburst monitoring and alarming device for an underground tunneling working face of the present invention provides a device that monitors and gives an early warning to gas outburst through multiple indicators such as roadway wind speed and direction, roadway gas concentration, coal seam gas concentration, and coal wall bulging deformation amount, and can improve the accuracy of gas outburst early warning.

[0006] The gas outburst monitoring and alarm device for an underground tunneling face of the present invention is realized as follows: The gas outburst monitoring and alarm device for an underground tunneling face of the present invention consists of a main body assembly, a roadway gas concentration detection assembly, and a coal seam gas concentration detection assembly. The main body assembly is composed of a semi-cylindrical pedestal, a wind speed and direction sensor, fixed ears, a diversion groove, and a displacement sensor. There are two fixed ears on the semi-cylindrical pedestal. The semi-cylindrical pedestal has a semi-cylindrical structure, and the diameter of the semi-cylindrical pedestal gradually increases from one side to the other. The two fixed ears are respectively located on both sides of the planar side wall of the semi-cylindrical pedestal. The fixed ears are close to the side of the semi-cylindrical pedestal. There is a diversion groove on the semi-cylindrical pedestal. The diversion groove is located on the arc-shaped side wall of the semi-cylindrical pedestal. The width of the diversion groove gradually increases from the middle to both ends, and the depth of the diversion groove gradually decreases from the middle to both ends. The wind speed and direction sensor is placed in the diversion groove. The wind speed and direction sensor is located in the middle of the diversion groove. The displacement sensor is located on the other side of the semi-cylindrical pedestal. The roadway gas concentration detection assembly is composed of a roadway outlet pipe, a roadway inlet pipe, a roadway gas concentration sensor, and a roadway gas detection pipe. The roadway inlet pipe is placed on the arc-shaped side wall of the semi-cylindrical pedestal. The roadway inlet pipe extends into the semi-cylindrical pedestal. The roadway inlet pipe is close to the side of the semi-cylindrical pedestal. The roadway outlet pipe is placed on the arc-shaped side wall of the semi-cylindrical pedestal. The roadway outlet pipe extends into the semi-cylindrical pedestal. The roadway outlet pipe is located below the roadway inlet pipe. The roadway outlet pipe and the roadway inlet pipe are respectively close to both sides of the planar side wall of the semi-cylindrical pedestal. There is a roadway gas detection pipe groove in the semi-cylindrical pedestal. The roadway gas detection pipe is placed in the roadway gas detection pipe groove. The roadway gas detection pipe is located between the roadway inlet pipe and the roadway outlet pipe. The diameter of the roadway gas detection pipe is larger than the diameters of the roadway inlet pipe and the roadway outlet pipe. One end of the roadway gas detection pipe is bent in an arc and connected to the roadway inlet pipe, and the other end is bent in an arc and connected to the roadway outlet pipe. The roadway gas concentration sensor is placed in the roadway gas detection pipe. The roadway inlet pipe, the roadway gas detection pipe, and the roadway outlet pipe are distributed in a zigzag shape in the semi-cylindrical pedestal. The coal seam gas concentration detection assembly is composed of a coal seam inlet pipe, a coal seam gas concentration sensor, a coal seam outlet pipe, a suction pump, and a coal seam gas detection pipe. The coal seam inlet pipe is placed on the planar side wall of the semi-cylindrical pedestal. The coal seam inlet pipe extends into the semi-cylindrical pedestal. The coal seam outlet pipe is placed on the planar side wall of the semi-cylindrical pedestal. The coal seam outlet pipe extends into the semi-cylindrical pedestal. The coal seam outlet pipe is located below the coal seam inlet pipe. The coal seam outlet pipe is close to the other side of the semi-cylindrical pedestal. There is a coal seam gas detection pipe groove in the semi-cylindrical pedestal. The coal seam gas detection pipe is placed in the coal seam gas detection pipe groove. The coal seam gas detection pipe is located between the coal seam inlet pipe and the coal seam outlet pipe. The coal seam gas detection pipe has a U-shaped structure. One end of the coal seam gas detection pipe is bent in an arc and connected to the coal seam inlet pipe, and the other end is bent in an arc and connected to the coal seam outlet pipe. The diameter of the coal seam gas detection pipe from one end to the middle is the same as the diameter of the coal seam inlet pipe.The diameter of the coal seam gas detection pipe from the middle to the other end is larger than that of the coal seam inlet pipe and the coal seam outlet pipe. The coal seam inlet pipe, the coal seam gas detection pipe, and the coal seam outlet pipe are distributed in an M shape within the semi-circular pedestal. The coal seam gas concentration sensor is placed inside the coal seam gas detection pipe, and the suction pump is placed inside the coal seam gas detection pipe. The suction pump is close to one end of the coal seam gas detection pipe, and the coal seam gas concentration sensor is close to the other end of the coal seam gas detection pipe.

[0007] Beneficial effects

[0008] 1. It can continuously monitor the coal seam gas concentration.

[0009] 2. It can monitor the slight outward bulging deformation of the coal wall.

[0010] 3. Comprehensive analysis of multiple monitoring indicators improves the accuracy of gas outburst early warning. Description of the drawings

[0011] Figure 1 It is a three-dimensional structure diagram of a gas outburst monitoring and alarm device for an underground tunneling working face of the present invention;

[0012] Figure 2 It is a structural schematic diagram of a gas outburst monitoring and alarm device for an underground tunneling working face of the present invention, which only shows the structure of the roadway gas concentration detection component;

[0013] Figure 3 It is a structural schematic diagram of a gas outburst monitoring and alarm device for an underground tunneling working face of the present invention, which only shows the structure of the coal seam gas concentration detection component;

[0014] In the drawings

[0015] Among them are: semi-circular pedestal 1, wind speed and direction sensor 2, roadway outlet pipe 3, fixed ear 4, roadway inlet pipe 5, diversion groove 6, roadway gas concentration sensor 7, roadway gas detection pipe 8, coal seam inlet pipe 9, coal seam gas concentration sensor 10, displacement sensor 11, coal seam outlet pipe 12, suction pump 13, coal seam gas detection pipe 14 Specific embodiments

[0016] The gas outburst monitoring and alarm device for an underground tunneling working face of the present invention is realized as follows: It is composed of a main body component, a roadway gas concentration detection component, and a coal seam gas concentration detection component. The main body component is composed of a semi-cylindrical pedestal 1, a wind speed and direction sensor 2, fixed ears 4, a diversion groove 6, and a displacement sensor 11. There are two fixed ears 4 on the semi-cylindrical pedestal 1. The semi-cylindrical pedestal 1 is of a semi-cylindrical structure, and the diameter of the semi-cylindrical pedestal 1 gradually increases from one side to the other. The two fixed ears 4 are respectively located on both sides of the planar side wall of the semi-cylindrical pedestal 1. The fixed ears 4 are close to one side of the semi-cylindrical pedestal 1. There is a diversion groove 6 on the semi-cylindrical pedestal 1. The diversion groove 6 is located on the arc-shaped side wall of the semi-cylindrical pedestal 1. The width of the diversion groove 6 gradually increases from the middle to both ends, and the depth of the diversion groove 6 gradually decreases from the middle to both ends. The wind speed and direction sensor 2 is placed in the diversion groove 6. The wind speed and direction sensor 2 is located in the middle of the diversion groove 6. The displacement sensor 11 is located on the other side of the semi-cylindrical pedestal 1.

[0017] The roadway gas concentration detection component is composed of a roadway outlet pipe 3, a roadway inlet pipe 5, a roadway gas concentration sensor 7, and a roadway gas detection pipe 8.

[0018] The roadway inlet pipe 5 is placed on the arc-shaped side wall of the semi-cylindrical pedestal 1. The roadway inlet pipe 5 extends into the semi-cylindrical pedestal 1. The roadway inlet pipe 5 is close to one side of the semi-cylindrical pedestal 1. The roadway outlet pipe 3 is placed on the arc-shaped side wall of the semi-cylindrical pedestal 1. The roadway outlet pipe 3 extends into the semi-cylindrical pedestal 1. The roadway outlet pipe 3 is located below the roadway inlet pipe 5. The roadway outlet pipe 3 and the roadway inlet pipe 5 are respectively close to both sides of the planar side wall of the semi-cylindrical pedestal 1. There is a roadway gas detection pipe groove in the semi-cylindrical pedestal 1. The roadway gas detection pipe 8 is placed in the roadway gas detection pipe groove. The roadway gas detection pipe 8 is located between the roadway inlet pipe 5 and the roadway outlet pipe 3. The diameter of the roadway gas detection pipe 8 is larger than the diameters of the roadway inlet pipe 5 and the roadway outlet pipe 3. One end of the roadway gas detection pipe 6 is bent in an arc and connected to the roadway inlet pipe 5, and the other end is bent in an arc and connected to the roadway outlet pipe 3. The roadway gas concentration sensor 7 is placed in the roadway gas detection pipe 8. The roadway inlet pipe 5, the roadway gas detection pipe 8, and the roadway outlet pipe 3 are distributed in a zigzag shape in the semi-cylindrical pedestal 1.

[0019] The coal seam gas concentration detection component is composed of a coal seam inlet pipe 9, a coal seam gas concentration sensor 10, a coal seam outlet pipe 12, a suction pump 13, and a coal seam gas detection pipe 14.

[0020] The coal seam intake pipe 9 is placed on the side wall of the plane of the semi-circular pedestal 1, and the coal seam intake pipe 9 extends into the semi-circular pedestal 1. The coal seam outlet pipe 12 is placed on the side wall of the plane of the semi-circular pedestal 1, and the coal seam outlet pipe 12 extends into the semi-circular pedestal 1. The coal seam outlet pipe 12 is located below the coal seam intake pipe 9, and the coal seam outlet pipe 12 is close to the other side of the semi-circular pedestal 1. A coal seam gas detection pipe groove is opened in the semi-circular pedestal 1, and a coal seam gas detection pipe 14 is arranged in the coal seam gas detection pipe groove. The coal seam gas detection pipe 14 is located between the coal seam intake pipe 9 and the coal seam outlet pipe 12. The coal seam gas detection pipe 14 is of a U-shaped structure. One end of the coal seam gas detection pipe 14 is bent in an arc and communicated with the coal seam intake pipe 9, and the other end is bent in an arc and communicated with the coal seam outlet pipe 12. The diameter of the coal seam gas detection pipe 14 from one end to the middle is the same as the diameter of the coal seam intake pipe 9. The diameter of the coal seam gas detection pipe 14 from the middle to the other end is larger than the diameters of the coal seam intake pipe 9 and the coal seam outlet pipe 12. The coal seam intake pipe 9, the coal seam gas detection pipe 14 and the coal seam outlet pipe 12 are distributed in an M shape in the semi-circular pedestal 1. A coal seam gas concentration sensor 10 is arranged in the coal seam gas detection pipe 14, and a suction pump 13 is arranged in the coal seam gas detection pipe 14. The suction pump 13 is close to one end of the coal seam gas detection pipe 14, and the coal seam gas concentration sensor 10 is close to the other end of the coal seam gas detection pipe 14;

[0021] During use, first drill a hole in the coal seam, extend the coal seam intake pipe 9 into the hole, and connect it to the bolt of the bolt on the roadway roof through the fixing ear 4 to fix the semi-circular pedestal 1 on the roadway roof. The displacement sensor 11 on the semi-circular pedestal 1 can continuously measure the distance from the coal wall. When the air flow in the roadway passes through the semi-circular pedestal 1, under the collection of the diversion groove 6, the change of the air flow speed and direction is amplified, which is convenient for the wind speed and direction sensor 2 to monitor the change of the wind speed and direction. At the same time, the air flow in the roadway enters the roadway gas detection pipe 8 through the roadway intake pipe, and the roadway gas concentration sensor 7 in the roadway gas detection pipe 8 detects the roadway gas concentration. The suction pump 13 of the coal seam intake pipe 9 can suck the gas in the coal seam into the coal seam gas detection pipe 14, and the coal seam gas concentration sensor 10 monitors the coal seam gas concentration; when a gas outburst is about to occur, the gas concentration in the roadway and the coal seam surges, and at the same time, the wind speed in the roadway is erratic, the wind direction changes greatly, and the distance between the bulging coal wall and the displacement sensor 11 decreases. Each sensor sends the detected signal to the mine safety monitoring platform. The monitoring platform compares and analyzes the gas concentration values in the roadway and the coal seam and the bulging value of the coal wall with the corresponding preset thresholds. When a certain monitoring value exceeds the preset threshold, a gas outburst warning indication is made, and the monitoring platform will analyze the change of the wind speed and direction in the roadway within a set time period. When the wind speed and direction in the roadway change abnormally within the set time period, a gas outburst warning indication is made;

[0022] The semi-cylindrical base 1 is a semi-cylindrical structure. The design that the diameter of the semi-cylindrical base 1 gradually increases from one side to the other can increase the size range of the semi-cylindrical base 1, thereby expanding the length of the coal seam gas detection tube 14, better achieving the slow flow and aggregation of coal seam gas, making the detection of coal seam gas concentration more accurate, and being more conducive to predicting gas outbursts;

[0023] The diversion groove 6 is located on the arc-shaped side wall of the semi-cylindrical base 1. The design that the width of the diversion groove 6 gradually increases from the middle to both ends and the depth of the diversion groove 6 gradually decreases from the middle to both ends can collect the air flow in the roadway, magnify the changes in the air flow speed and direction, making the changes in the air flow speed and direction measured by the air flow speed and direction sensor 2 more obvious;

[0024] The roadway outlet gas pipe 3 is located below the roadway inlet gas pipe 5. The design that the roadway outlet gas pipe 2 and the roadway inlet gas pipe 5 are respectively close to both sides of the plane side wall of the semi-cylindrical base 1 can increase the flow path of the roadway air flow, slow down its flow rate, and make it slowly flow and aggregate in the roadway gas detection tube 8, thereby making the measurement of the roadway gas concentration sensor 7 more accurate and being more conducive to predicting gas outbursts;

[0025] The roadway gas detection tube 8 is located between the roadway inlet gas pipe 5 and the roadway outlet gas pipe 3. The design that the diameter of the roadway gas detection tube 8 is larger than the diameters of the roadway inlet gas pipe 5 and the roadway outlet gas pipe 3 can achieve slow flow and aggregation of the roadway air flow, making the measurement of the roadway gas concentration sensor 7 more accurate and being more conducive to predicting gas outbursts;

[0026] The design that the roadway inlet gas pipe 5, the roadway gas detection tube 8 and the roadway outlet gas pipe 3 are distributed in a zigzag shape in the semi-cylindrical base 1 can increase the flow path of the roadway air flow, make it slowly flow and aggregate in the roadway gas detection tube 8, and thereby make the measurement of the roadway gas concentration sensor 7 more accurate;

[0027] The coal seam gas detection tube 14 is located between the coal seam inlet gas pipe 9 and the coal seam outlet gas pipe 12. The design that the coal seam gas detection tube 14 is a U-shaped structure can increase the flow path of the coal seam gas, make it slowly flow and aggregate in the coal seam gas detection tube 14, and thereby make the measurement of the coal seam gas concentration sensor 10 more accurate and being more conducive to predicting gas outbursts;

[0028] The design that the coal seam inlet gas pipe 9, the coal seam gas detection tube 14 and the coal seam outlet gas pipe 12 are distributed in an M-shaped pattern in the semi-cylindrical base 1 can make the coal seam gas slowly flow and aggregate in the coal seam gas detection tube 14, and thereby make the measurement of the coal seam gas concentration sensor 10 more accurate;

[0029] The coal seam inlet gas pipe 9 cooperates with the suction pump 13 to be able to suck the coal seam gas into the coal seam gas detection tube 14 for concentration monitoring;

[0030] The roadway gas detection tube 8 and the roadway gas concentration sensor 7 cooperate to monitor the gas concentration in the roadway;

[0031] The diversion groove 6 and the wind speed and direction sensor 2 cooperate to monitor and analyze the changes in wind speed and direction in the roadway;

[0032] The semi-cylindrical pedestal 1 and the displacement sensor 11 cooperate to continuously measure the distance to the coal wall, and then monitor the bulging deformation amount of the coal wall;

[0033] The wind speed and direction sensor 2, the displacement sensor 11, the roadway gas concentration sensor 7 and the coal seam gas concentration sensor 10 cooperate with each other to monitor and analyze various indicators such as the wind speed and direction in the roadway, the gas concentration in the roadway, the gas concentration in the coal seam, and the bulging deformation amount of the coal wall, and improve the accuracy of gas outburst early warning;

[0034] The purpose of monitoring and warning gas outburst through various indicators such as the wind speed and direction in the roadway, the gas concentration in the roadway, the gas concentration in the coal seam, and the bulging deformation amount of the coal wall is achieved, and the accuracy of gas outburst early warning is improved.

[0035] It should be noted that unless otherwise clearly defined and limited, the terms "placed", "connected", and "joined" should be understood in a broad sense. For example, it can be fixed connection methods such as hem connection, rivet connection, pin connection, bonding connection, and welding connection, or detachable connection methods such as threaded connection, snap connection, and hinge connection, or integral connection, or electrical connection, or directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0036] The above embodiments are the preferred embodiments of the present invention. In order to save space, the applicant has not added other embodiments, but this is not intended to limit the scope of implementation of the present invention. Any person of ordinary skill in the art, without departing from the scope of the present invention, can make some improvements. That is, all equivalent improvements made in accordance with the present invention should be covered by the scope of the present invention.

Claims

1. An underground tunneling face gas outburst monitoring and alarming device, characterized in that: It consists of a main body component, a roadway gas concentration detection component, and a coal seam gas concentration detection component. The main body component consists of a semi-cylindrical pedestal, a wind speed and direction sensor, fixed ears, a diversion groove, and a displacement sensor. There are two fixed ears on the semi-cylindrical pedestal, and the two fixed ears are respectively located on both sides of the plane side wall of the semi-cylindrical pedestal. On the side of the fixed ear close to the semi-cylindrical pedestal, there is a diversion groove on the semi-cylindrical pedestal. The wind speed and direction sensor is placed in the diversion groove, and the wind speed and direction sensor is located in the middle of the diversion groove. The displacement sensor is located on the other surface of the semi-cylindrical pedestal. The roadway gas concentration detection component consists of a roadway outlet pipe, a roadway inlet pipe, a roadway gas concentration sensor, and a roadway gas detection pipe. The roadway inlet pipe is placed on the arc-shaped side wall of the semi-cylindrical pedestal, and the roadway inlet pipe extends into the semi-cylindrical pedestal. The roadway outlet pipe is placed on the arc-shaped side wall of the semi-cylindrical pedestal, and the roadway outlet pipe extends into the semi-cylindrical pedestal. There is a roadway gas detection pipe groove in the semi-cylindrical pedestal, and the roadway gas detection pipe is placed in the roadway gas detection pipe groove. One end of the roadway gas detection pipe is bent in an arc and connected to the roadway inlet pipe, and the other end is bent in an arc and connected to the roadway outlet pipe. The roadway gas concentration sensor is placed in the roadway gas detection pipe. The coal seam gas concentration detection component consists of a coal seam inlet pipe, a coal seam gas concentration sensor, a coal seam outlet pipe, a suction pump, and a coal seam gas detection pipe. The coal seam inlet pipe is placed on the plane side wall of the semi-cylindrical pedestal, and the coal seam inlet pipe extends into the semi-cylindrical pedestal. The coal seam outlet pipe is placed on the plane side wall of the semi-cylindrical pedestal, and the coal seam outlet pipe extends into the semi-cylindrical pedestal. There is a coal seam gas detection pipe groove in the semi-cylindrical pedestal, and the coal seam gas detection pipe is placed in the coal seam gas detection pipe groove. One end of the coal seam gas detection pipe is bent in an arc and connected to the coal seam inlet pipe, and the other end is bent in an arc and connected to the coal seam outlet pipe. The coal seam gas concentration sensor is placed in the coal seam gas detection pipe. The suction pump is placed in the coal seam gas detection pipe, and the suction pump is close to one end of the coal seam gas detection pipe. The coal seam gas concentration sensor is close to the other end of the coal seam gas detection pipe.

2. The gas outburst monitoring and alarming device for an underground tunneling working face according to claim 1, characterized in that The semi-cylindrical pedestal is of a semi-cylindrical structure, and the diameter of the semi-cylindrical pedestal gradually increases from one side to the other side.

3. The gas outburst monitoring and alarming device for an underground tunneling working face according to claim 1, characterized in that The diversion groove is located on the arc-shaped side wall of the semi-cylindrical pedestal. The width of the diversion groove gradually increases from the middle to both ends, and the depth of the diversion groove gradually decreases from the middle to both ends.

4. The gas outburst monitoring and alarming device for an underground tunneling working face according to claim 1, characterized in that The roadway inlet pipe is on the side close to the semi-cylindrical pedestal. The roadway outlet pipe is located below the roadway inlet pipe, and the roadway outlet pipe and the roadway inlet pipe are respectively close to both sides of the plane side wall of the semi-cylindrical pedestal.

5. The gas outburst monitoring and alarm device for an underground tunneling working face according to claim 1, characterized in that The roadway gas detection pipe is located between the roadway inlet pipe and the roadway outlet pipe, and the diameter of the roadway gas detection pipe is larger than the diameters of the roadway inlet pipe and the roadway outlet pipe.

6. The gas outburst monitoring and alarming device for an underground tunneling working face according to claim 1, characterized in that The roadway inlet pipe, the roadway gas detection pipe, and the roadway outlet pipe are distributed in a zigzag shape in the semi-cylindrical pedestal.

7. The gas outburst monitoring and alarming device for an underground tunneling working face according to claim 1, characterized in that The coal seam outlet pipe is located below the coal seam inlet pipe, and the coal seam outlet pipe is close to the other side of the semi-cylindrical pedestal.

8. The gas outburst monitoring and alarm device for an underground tunneling working face according to claim 1, characterized in that The coal seam gas detection pipe is located between the coal seam inlet pipe and the coal seam outlet pipe, and the coal seam gas detection pipe is of a U-shaped structure.

9. The gas outburst monitoring and alarming device for an underground tunneling working face according to claim 1 or 8, characterized in that The diameter of the coal seam gas detection tube from one end to the middle is the same as that of the coal seam inlet pipe, and the diameter of the coal seam gas detection tube from the middle to the other end is larger than the diameters of the coal seam inlet pipe and the coal seam outlet pipe.

10. A gas outburst monitoring and alarming device for an underground tunneling working face according to claim 1 or 7 or 8, characterized in that The coal seam inlet pipe, the coal seam gas detection tube, and the coal seam outlet pipe are distributed in an M shape within the semi-circular pedestal.

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