Gas monitoring equipment and method used in underground mine

Abstract

The invention relates to the technical field of gas detection, and discloses a gas monitoring device and method used in an underground mine, the gas monitoring device used in the underground mine comprises a portable gas monitor, the front side of the portable gas monitor is provided with an active gas suction mechanism, and the active gas suction mechanism comprises a residue clearing mechanism, a flow control member and two shaking members; the residue removing mechanism comprises an air suction air bag, air inlet holes are formed in the inner ring wall of the air suction air bag, and a plurality of supporting columns communicating with one another are arranged on the inner wall of the air suction air bag. According to the invention, the shaking part shakes along with the body of a worker, newly inhaled air is used for detection each time, error accumulation possibly caused by repeated use of old air is avoided, so that the accuracy and reliability of gas monitoring are improved, the newly inhaled air can reflect the gas environment condition in a mine in real time, and the safety of gas monitoring is improved. And a worker can know the safety condition of the current environment in time.

Description

Technical Field

[0001] The present invention relates to the field of gas detection, and more specifically, it relates to a gas monitoring device and method for use in underground mines. Background Art

[0002] The gas monitoring equipment used in mines is a key component of the mine safety monitoring system, and plays an irreplaceable role in preventing gas explosions and ensuring the safety of miners' lives. The equipment for analyzing the gases in coal mines can accurately detect the concentrations of gases such as gas, oxygen, and carbon dioxide in the mine, and can provide real-time data monitoring.

[0003] The portable gas detector is small and light, convenient for staff to carry around for real-time detection. When the concentration of harmful gases exceeds the standard, the equipment can emit an alarm to remind the staff to take timely measures to avoid accidents. When working in the mine, the gas monitor worn on the chest of the staff undertakes the important task of regularly detecting the air. In actual operation, not all of the inhaled air can be exhausted after each detection, resulting in a part of the air sample being the residue of the previous time when conducting the next detection. The residual air sample may contain the gas components from the previous detection, which will interfere with the new detection results and lead to inaccurate detection data. For this reason, we propose a gas monitoring device and method for use in underground mines. Summary of the Invention

[0004] The present invention provides a gas monitoring device and method for use in underground mines, which solves the technical problem in the related art that the residual air sample may contain the gas components from the previous detection, which will interfere with the new detection results and lead to inaccurate detection data.

[0005] The first aspect of the present invention provides a gas monitoring device for use in underground mines, including a portable gas monitor. An active air suction mechanism is arranged on the front surface of the portable gas monitor. The active air suction mechanism includes a residual air cleaning mechanism, a flow control member, and two swing members. The residual air cleaning mechanism includes an air suction airbag. An air inlet hole is formed on the inner ring wall of the air suction airbag, and a plurality of mutually connected support columns are arranged on its inner wall. The flow control member includes a first piston and a second piston. The space between the air suction airbag and the first piston and the second piston is mutually connected, and the space between the support columns and the second piston is mutually connected. Each swaying part includes a counterweight ball and a driving part. The counterweight ball sways as the staff moves in the mine, and pulls the first piston and the second piston to move towards each other through the driving part. The air inhaled from the mine enters the space between the first piston and the second piston through the air inlet hole. Subsequently, through the reset action of the second piston, the air in the support column is pumped into the space on one side of the second piston, causing the suction airbag to deflate. Furthermore, the air in the suction airbag is squeezed into the space between the first piston and the second piston for the gas detection sensor assembly to detect. The newly inhaled air is used for each detection.

[0006] Furthermore, the active air intake mechanism further includes an assembly box. An air intake port is provided at the center position of the assembly box. An inner box is fixedly arranged inside the assembly box. The centers of the suction airbag and the air intake port are located at the same position, and the suction airbag is fixedly connected to the inner wall of the air intake port. The structure of the inner box is in the shape of a "mouth", and the suction airbag is surrounded by the inner box.

[0007] Furthermore, the residual cleaning mechanism further includes a connecting pipe. The suction airbag is interconnected with the space between the first piston and the second piston through the connecting pipe. An annular pipe is arranged between several support columns. The air outlet end of the annular pipe is connected with a negative pressure pipe. The end of the negative pressure pipe far from the annular pipe is interconnected with the space on one side of the second piston.

[0008] Furthermore, the flow control part further includes a gas control box. Both the first piston and the second piston are slidably connected to the inside of the gas control box. A second sliding column is fixedly arranged on the side of the first piston away from the second piston. A first sliding column is fixedly arranged on the side of the second piston away from the first piston. Both the first sliding column and the second sliding column penetrate through the gas control box, and springs are sleeved on both the first sliding column and the second sliding column.

[0009] Furthermore, a first blocking head is rotatably arranged on the upper inner wall of the gas control box. A connecting control rope and a first spring are fixedly arranged at the end of the first blocking head close to the first piston. The end of the connecting control rope far from the first blocking head is fixedly arranged with a second blocking head, and the second blocking head is rotatably connected to the upper inner wall of the gas control box. A second spring is fixedly arranged at the end of the second blocking head close to the connecting control rope.

[0010] Furthermore, the air outlet end of the gas control box is connected with a spray pipe. The end of the spray pipe far from the gas control box is aligned with the gas detection sensor assembly, and the air outlet end of the spray pipe does not contact the gas detection sensor assembly.

[0011] Furthermore, the end of the second sliding column away from the first piston is fixedly connected with a pull rope. A magnetic sheet is wrapped at the four-fifths position of the pull rope. A magnetic block is fixedly arranged at the end of the pull rope far from the first piston.

[0012] Further, the swaying member further includes a ratchet gear. A wire reel is movably arranged on one side of the ratchet gear. A rotating column fixedly connected to the center of the ratchet gear is rotatably arranged inside the wire reel. The wire reel is fixedly connected to the magnet. A card slot and a limiting slot are formed on the contact surface between the rotating column and the wire reel. A clamping head is slidably arranged inside the limiting slot.

[0013] Further, a push ratchet head is arranged above the ratchet gear. A collision receiving plate is fixedly arranged above the push ratchet head. The collision receiving plate is Y-shaped. A plumb line is fixedly arranged on the counterweight ball. An impact ball is fixedly arranged at one end of the plumb line close to the collision receiving plate. A connecting column is rotatably connected between the counterweight balls of the two swaying members.

[0014] The second aspect of the present invention provides a method for a gas monitoring device used in an underground mine, including the following steps: S1. Wear the portable gas monitor on the chest and enter the mine. The counterweight ball sways as the staff moves, and the two counterweight balls are kept swaying in the same direction and with the same amplitude through the connecting column; S2. The swaying of the counterweight ball drives the plumb line and the impact ball to swing. The impact ball impacts the collision receiving plate. The collision receiving plate drives the push ratchet head to swing. Each time the push ratchet head swings, it pushes the ratchet gear to rotate clockwise once; S3. The rotation of the ratchet gear drives the rotating column and the wire reel to rotate. The wire reel gradually winds up the pull rope through the magnetic repulsion between the magnet and the clamping head. The pull rope pulls the second sliding column, and the first piston and the second piston move towards both ends simultaneously, inhaling air from the communicating pipe; S4. When the pull rope is wound up to the position of the magnetic sheet, the magnetic sheet attracts the clamping head to retract into the limiting slot. Under the action of the spring, the first piston and the second piston slide back to the central position simultaneously. When the second piston loses the block of the second blocking head, it rebounds faster than the first piston, and the air in the support column is pumped out through the negative pressure pipe and the annular pipe, causing the suction airbag to deflate; S5. Part of the air in the suction airbag is discharged from the air inlet hole, and part of it enters the space between the first piston and the second piston of the air control box. When the first piston slides back in place, it pushes the first blocking head to rotate, releases the block on the second piston, and simultaneously pulls the control rope to make the second blocking head rotate; S6. As the space between the first piston and the second piston gradually decreases, the air is sprayed out from the spray pipe and sprayed onto the gas detection sensor assembly for detection. The whole process is cycled, and the newly inhaled air is used for each detection; S7. When the gas detection sensor assembly detects that the gas concentration sprayed out from the spray pipe exceeds the set value, the portable gas monitor emits an alarm signal. When the gas monitor emits an alarm signal, the operator should immediately stop the operation and evacuate to a safe area.

[0015] The beneficial effects of the present invention are as follows: In the present invention, the swaying component follows the body swaying of the staff. Each time the detection uses newly inhaled air, avoiding the error accumulation caused by the repeated use of old air, thereby improving the accuracy and reliability of gas monitoring. The newly inhaled air can reflect the gas environment in the mine in real time, helping the staff to timely understand the safety status of the current environment and take corresponding safety measures. Avoiding the use of contaminated or already detected air can reduce the interference of external factors on the gas detection sensor assembly and improve the accuracy of the detection results; The active air inhalation controlled by the swaying component can update the detection samples more frequently, timely discover potential gas safety hazards, provide more timely safety warnings for the staff, and enhance the safety of mine operations. No matter where the staff moves in the mine, as long as the body sways, it can drive the active air inhalation mechanism to work, improving the adaptability and flexibility of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the overall structural schematic diagram of the gas monitoring device for use in underground mines of the present invention; Figure 2 is the connection structural schematic diagram of the air inlet and the air inhalation airbag of the gas monitoring device for use in underground mines of the present invention; Figure 3 is the structural schematic diagram of the assembly box of the gas monitoring device for use in underground mines of the present invention; Figure 4 is the structural schematic diagram of the inner box of the gas monitoring device for use in underground mines of the present invention; Figure 5 is the internal structural schematic diagram of the inner box of the gas monitoring device for use in underground mines of the present invention; Figure 6 is the structural schematic diagram of the ratchet gear of the gas monitoring device for use in underground mines of the present invention; Figure 7 is the structural schematic diagram of the wire reel of the gas monitoring device for use in underground mines of the present invention; Figure 8 is of the gas monitoring device for use in underground mines of the present invention Figure 7 enlarged schematic diagram at position A; Figure 9 is the internal structural schematic diagram of the air control box of the gas monitoring device for use in underground mines of the present invention; Figure 10 is the internal structural schematic diagram of the air inhalation airbag of the gas monitoring device for use in underground mines of the present invention; Figure 11 is the structural schematic diagram of the blocking head of the gas monitoring device for use in underground mines of the present invention.

[0017] In the figure: 11, portable gas monitor; 12, clip; 2, active air suction mechanism; 21, assembly box; 22, air suction port; 23, inner box; 3, residual cleaning mechanism; 31, air suction airbag; 32, air inlet hole; 33, connecting pipe; 34, negative pressure pipe; 35, annular pipe; 36, support column; 4, swaying member; 41, ratchet gear; 42, wire reel; 43, rotating column; 44, push ratchet head; 45, impact plate; 46, plumb line; 47, impact ball; 48, counterweight ball; 49, connecting column; 401, clamping groove; 402, limiting groove; 403, clamping head; 51, air control box; 52, first sliding column; 53, second sliding column; 54, pull rope; 55, magnetic sheet; 56, magnetic block; 57, first piston; 58, second piston; 59, air jet pipe; 501, joint control rope; 502, first blocking head; 503, first spring; 504, second blocking head; 505, second spring. Detailed implementation manners

[0018] Now, the subject matter described herein will be discussed with reference to exemplary implementation manners. It should be understood that discussing these implementation manners is only to enable those skilled in the art to better understand and thus implement the subject matter described herein. Without departing from the protection scope of the content of this specification, changes can be made to the functions and arrangements of the elements discussed. Each example can omit, substitute, or add various processes or components as needed. Additionally, the features described for some examples can also be combined in other examples.

[0019] As Figure 1 , Figure 2 , Figure 3 and Figure 5 shown, a gas monitoring device for use in an underground mine includes a portable gas monitor 11. An active air suction mechanism 2 is provided on the front surface of the portable gas monitor 11. The active air suction mechanism 2 includes a residual cleaning mechanism 3, a flow control member, and two swaying members 4; The residual cleaning mechanism 3 includes an air suction airbag 31. An air inlet hole 32 is formed in the inner ring wall of the air suction airbag 31, and a plurality of mutually connected support columns 36 are provided on its inner wall; The flow control member includes a first piston 57 and a second piston 58. The space between the air suction airbag 31 and the first piston 57 and the second piston 58 is mutually connected, and the space between the support column 36 and one side of the second piston 58 is mutually connected; Each swaying part 4 includes a counterweight ball 48 and a driving part. The counterweight ball 48 sways as the staff moves in the mine, and pulls the first piston 57 and the second piston 58 to move towards each other through the driving part. The air inhaled from the mine enters the space between the first piston 57 and the second piston 58 through the air inlet hole 32. Subsequently, through the reset action of the second piston 58, the air in the support column 36 is pumped into the space on one side of the second piston 58, causing the suction airbag 31 to deflate. Furthermore, the air in the suction airbag 31 is squeezed into the space between the first piston 57 and the second piston 58 for the gas detection sensor assembly to detect. The newly inhaled air is used for each detection.

[0020] As Figure 4 , Figure 5 , Figure 6 and Figure 7 shown, the active air suction mechanism 2 further includes an assembly box 21. An air suction port 22 is provided at the center position of the assembly box 21. An inner box 23 is fixedly arranged inside the assembly box 21. The centers of the suction airbag 31 and the air suction port 22 are located at the same position, and the suction airbag 31 is fixedly connected to the inner wall of the air suction port 22. The structure of the inner box 23 is in the shape of a square, and the suction airbag 31 is surrounded by the inner box 23.

[0021] The hanging clip 12 is arranged on the back of the portable gas monitor 11. The staff entering the mine can hang the portable gas monitor 11 on the chest and assemble the assembly box 21 with the portable gas monitor 11 so that the air jet pipe 59 is aligned with the gas detection sensor assembly.

[0022] The residual cleaning mechanism 3 further includes a communicating pipe 33. The suction airbag 31 is communicated with the space between the first piston 57 and the second piston 58 through the communicating pipe 33. An annular pipe 35 is arranged between several support columns 36. The air outlet end of the annular pipe 35 is connected with a negative pressure pipe 34. The end of the negative pressure pipe 34 far from the annular pipe 35 is communicated with the space on one side of the second piston 58.

[0023] As Figure 9 , Figure 10 and Figure 11 shown, the flow control part further includes a gas control box 51. Both the first piston 57 and the second piston 58 are slidably connected to the inside of the gas control box 51. A second sliding column 53 is fixedly arranged on the side of the first piston 57 far from the second piston 58. A first sliding column 52 is fixedly arranged on the side of the second piston 58 far from the first piston 57. Both the first sliding column 52 and the second sliding column 53 penetrate through the gas control box 51, and springs are sleeved on both the first sliding column 52 and the second sliding column 53.

[0024] A blocking head one 502 is rotatably arranged on the inner upper wall of the air control box 51. One end of the blocking head one 502 close to the piston one 57 is fixedly provided with a linkage rope 501 and a spring one 503. One end of the linkage rope 501 away from the blocking head one 502 is fixedly provided with a blocking head two 504, and the blocking head two 504 is rotatably connected to the inner upper wall of the air control box 51. One end of the blocking head two 504 close to the linkage rope 501 is fixedly provided with a spring two 505.

[0025] The air outlet end of the air control box 51 is connected with an air spray pipe 59. One end of the air spray pipe 59 away from the air control box 51 is aligned with the gas detection sensor assembly, and the air outlet end of the air spray pipe 59 does not contact the gas detection sensor assembly.

[0026] One end of the sliding column two 53 away from the piston one 57 is fixedly connected with a pull rope 54. A magnetic sheet 55 is wrapped at the four-fifths position of the pull rope 54. One end of the pull rope 54 away from the piston one 57 is fixedly provided with a magnetic block 56.

[0027] As Figure 5 、 Figure 6 、 Figure 7 and Figure 8 shown, the swaying part 4 further includes a ratchet gear 41. A winding wheel 42 is movably arranged on one side of the ratchet gear 41. A rotating column 43 fixedly connected with the center of the ratchet gear 41 is rotatably arranged inside the winding wheel 42. The winding wheel 42 is fixedly connected with the magnetic block 56. A clamping groove 401 and a limiting groove 402 are formed on the contact surface between the rotating column 43 and the winding wheel 42. A clamping head 403 is slidably arranged inside the limiting groove 402.

[0028] A push ratchet head 44 is arranged above the ratchet gear 41. A collision receiving plate 45 is fixedly arranged above the push ratchet head 44. The collision receiving plate 45 is Y-shaped. A plumb line 46 is fixedly arranged on the counterweight ball 48. An impact ball 47 is fixedly arranged at one end of the plumb line 46 close to the collision receiving plate 45. A connecting column 49 is rotatably connected between the counterweight balls 48 of the two swaying parts 4.

[0029] When the staff wears the personal gas monitor 11 on the chest and enters the mine to work, the two counterweight balls 48 sway along with the movement of the staff's body. Through the connecting column 49, the two counterweight balls 48 sway in the same direction and with the same amplitude. The swaying of the counterweight ball 48 drives the plumb line 46 to swing. When the plumb line 46 swings, it drives the impact ball 47 to swing in the collision receiving plate 45 and impacts the collision receiving plate 45, thereby driving the push ratchet head 44 to swing. Through the swing of the push ratchet head 44, every time it swings, it will push the ratchet gear 41 to rotate clockwise once; Drive the rotating column 43 to rotate through the ratchet gear 41. Due to the magnetic repulsion between the magnetic block 56 and the chuck 403, the chuck 403 extends from the limit groove 402 and catches into the card slot 401. Thus, drive the wire reel 42 to rotate through the rotating column 43, gradually wind up the pulling rope 54 through the wire reel 42, gradually pull the sliding column two 53 through the pulling rope 54, and another swaying member 4 has the same working process to pull the sliding column one 52, so that the piston one 57 and the piston two 58 move towards both ends at the same time. During this sliding, inhale air from the communicating pipe 33. One-way valves are provided inside both the communicating pipe 33 and the air jet pipe 59, and the communicating pipe 33 and the air jet pipe 59 can only discharge air; When the pulling rope 54 is wound up to the position of the magnetic piece 55, due to the attraction of the magnetic piece 55 to the chuck 403, the chuck 403 retracts back into the limit groove 402 again. At this time, under the action of the spring, drive the piston one 57 and the piston two 58 to slide back to the central position at the same time, and at the same time drive the wire reel 42 to release the wound pulling rope 54. The chuck 403 extends from the limit groove 402 again and catches into the card slot 401, facilitating the next round of work; When the piston one 57 slides to the position of the blocking head one 502, it will push the blocking head one 502 to rotate, and at the same time pull the coupled control rope 501, pull the blocking head two 504 to rotate, release the blocking of the piston two 58. The spring force on the side of the piston two 58 is greater than that on the side of the piston one 57. When the piston two 58 loses the blocking of the blocking head two 504, the piston two 58 rebounds faster than the piston one 57. While the piston two 58 rebounds, draw out the air in the support column 36 through the negative pressure pipe 34 and the annular pipe 35, so that the suction airbag 31 collapses. Part of the air in the suction airbag 31 is discharged through the air inlet hole 32, and part enters the space between the piston one 57 and the piston two 58 of the air control box 51; As the piston one 57 slides back to its position, the air between the piston one 57 and the piston two 58 can be sprayed from the air jet pipe 59 onto the gas detection sensor assembly for detection.

[0030] A method for a gas monitoring device used in an underground mine includes the following steps: S1. Wear the portable gas monitor 11 on the chest and enter the mine. The counterweight ball 48 sways as the staff moves, and the connecting column 49 keeps the two counterweight balls 48 swaying in the same direction and with the same amplitude; S2. The swaying of the counterweight ball 48 drives the plumb line 46 and the impact ball 47 to swing. The impact ball 47 impacts the impacted plate 45, and the impacted plate 45 drives the push ratchet head 44 to swing. Each time the push ratchet head 44 swings, it pushes the ratchet gear 41 to rotate clockwise once; S3. The rotation of the ratchet gear 41 drives the rotation of the follower column 43 and the wire reel 42. The wire reel 42 gradually winds up the pull rope 54 through the magnetic repulsion between the magnetic block 56 and the chuck 403. The pull rope 54 pulls the second sliding column 53, and the first piston 57 and the second piston 58 move towards both ends simultaneously, sucking air from the connecting pipe 33. S4. When the pull rope 54 is wound up to the position of the magnetic sheet 55, the magnetic sheet 55 attracts the chuck 403 to retract into the limiting groove 402. Under the action of the spring, the first piston 57 and the second piston 58 slide back towards the central position simultaneously. When the second piston 58 loses the block of the second blocking head 504, it rebounds faster than the first piston 57, and extracts the air in the support column 36 through the negative pressure pipe 34 and the annular pipe 35, causing the suction airbag 31 to deflate. S5. Part of the air in the suction airbag 31 is discharged through the air inlet hole 32, and part of it enters the space between the first piston 57 and the second piston 58 of the air control box 51. When the first piston 57 slides back in place, it pushes the first blocking head 502 to rotate, releases the block on the second piston 58, and simultaneously pulls the linkage rope 501 to make the second blocking head 504 rotate. S6. As the space between the first piston 57 and the second piston 58 gradually decreases, the air is ejected from the jet pipe 59 and sprayed onto the gas detection sensor assembly for detection. The whole process is cycled, and the newly inhaled air is used for each detection. S7. When the gas detection sensor assembly detects that the gas concentration ejected from the jet pipe 59 exceeds the set value, the personal gas monitor 11 emits an alarm signal. When the gas monitor emits an alarm signal, the operator should immediately stop the operation and evacuate to a safe area.

[0031] The above describes the embodiments of this embodiment, but this embodiment is not limited to the above specific implementation manners. The above specific implementation manners are only illustrative and not restrictive. Under the inspiration of this embodiment, those of ordinary skill in the art can also make many forms, all of which fall within the protection scope of this embodiment.

Claims

1. A gas monitoring device for use in an underground mine, including a portable gas monitor (11), characterized in that, The front of the portable gas monitor (11) is provided with an active air suction mechanism (2), and the active air suction mechanism (2) includes a residual cleaning mechanism (3), a flow control member, and two swaying members (4); The residual cleaning mechanism (3) includes an air suction airbag (31), the inner ring wall of the air suction airbag (31) is provided with an air inlet hole (32), and a plurality of support columns (36) communicating with each other are arranged on its inner wall; The flow control member includes a first piston (57) and a second piston (58), the air suction airbag (31) communicates with the space between the first piston (57) and the second piston (58), and the support column (36) communicates with the space on one side of the second piston (58); Each swaying member (4) includes a counterweight ball (48) and a driving member. The counterweight ball (48) sways as the staff moves in the mine, and pulls the first piston (57) and the second piston (58) to move towards each other through the driving member. The air inhaled from the mine enters the space between the first piston (57) and the second piston (58) through the air inlet hole (32). Subsequently, through the reset action of the second piston (58), the air in the support column (36) is pumped into the space on one side of the second piston (58), causing the air suction airbag (31) to deflate, and further squeezing the air in the air suction airbag (31) into the space between the first piston (57) and the second piston (58) for the gas detection sensor assembly to detect. The newly inhaled air is used for each detection.

2. The gas monitoring device for use in an underground mine according to claim 1, wherein, The active air suction mechanism (2) further includes an assembly box (21). An air suction port (22) is opened at the center position of the assembly box (21). An inner box (23) is fixedly arranged inside the assembly box (21). The centers of the air suction airbag (31) and the air suction port (22) are located at the same position, and the inner wall of the air suction airbag (31) is fixedly connected to the inner wall of the air suction port (22). The structure of the inner box (23) is in the shape of a "mouth", and the air suction airbag (31) is surrounded by the inner box (23).

3. The gas monitoring device for use in an underground mine according to claim 1, characterized in that, The residual cleaning mechanism (3) further includes a connecting pipe (33). The air suction airbag (31) communicates with the space between the first piston (57) and the second piston (58) through the connecting pipe (33). An annular pipe (35) is arranged between a plurality of support columns (36). The air outlet end of the annular pipe (35) is connected with a negative pressure pipe (34). The end of the negative pressure pipe (34) far away from the annular pipe (35) communicates with the space on one side of the second piston (58).

4. The gas monitoring device for use in an underground mine according to claim 1, wherein The flow control member further includes an air control box (51). The first piston (57) and the second piston (58) are both slidably connected to the inside of the air control box (51). A second sliding column (53) is fixedly arranged on the side of the first piston (57) away from the second piston (58). A first sliding column (52) is fixedly arranged on the side of the second piston (58) away from the first piston (57). Both the first sliding column (52) and the second sliding column (53) penetrate through the air control box (51), and springs are sleeved on both the first sliding column (52) and the second sliding column (53).

5. The gas monitoring device for use in an underground mine according to claim 4, characterized in that, A blocking head one (502) is rotatably arranged on the inner upper wall of the air control box (51). One end of the blocking head one (502) close to the piston one (57) is fixedly provided with a linkage rope (501) and a spring one (503). One end of the linkage rope (501) far from the blocking head one (502) is fixedly provided with a blocking head two (504), and the blocking head two (504) is rotatably connected to the inner upper wall of the air control box (51). One end of the blocking head two (504) close to the linkage rope (501) is fixedly provided with a spring two (505).

6. The gas monitoring device for use in an underground mine according to claim 5, characterized in that, The air outlet end of the air control box (51) is connected with an air spray pipe (59). One end of the air spray pipe (59) far from the air control box (51) is aligned with the gas detection sensor assembly, and the air outlet end of the air spray pipe (59) does not contact the gas detection sensor assembly.

7. The gas monitoring device for use in an underground mine according to claim 5, wherein, One end of the sliding column two (53) far from the piston one (57) is fixedly connected with a pull rope (54). A magnetic sheet (55) is wrapped at the four-fifths position of the pull rope (54). One end of the pull rope (54) far from the piston one (57) is fixedly provided with a magnetic block (56).

8. The gas monitoring device for use in an underground mine according to claim 7, characterized in that, The swaying part (4) further includes a ratchet gear (41). A wire reel (42) is movably arranged on one side of the ratchet gear (41). A rotating column (43) fixedly connected with the center of the ratchet gear (41) is rotatably arranged inside the wire reel (42). The wire reel (42) is fixedly connected with the magnetic block (56). A card slot (401) and a limiting slot (402) are arranged on the contact surface between the rotating column (43) and the wire reel (42). A card head (403) is slidably arranged inside the limiting slot (402).

9. The gas monitoring device for use in an underground mine according to claim 8, characterized in that, A push ratchet head (44) is arranged above the ratchet gear (41). A collision receiving plate (45) is fixedly arranged above the push ratchet head (44). The collision receiving plate (45) is Y-shaped. A vertical line (46) is fixedly arranged on the counterweight ball (48). An impact ball (47) is fixedly arranged at one end of the vertical line (46) close to the collision receiving plate (45). A connecting column (49) is rotatably connected between the counterweight balls (48) of the two swaying parts (4).

10. A method of using the gas monitoring device for underground mines according to any one of claims 1-9, characterized in that, Including the following steps: S1. Wear the portable gas monitor (11) on the chest and enter the mine. The counterweight ball (48) sways as the staff moves, and the two counterweight balls (48) are kept swaying in the same direction and with the same amplitude through the connecting column (49). S2. The swaying of the counterweight ball (48) drives the vertical line (46) and the impact ball (47) to swing. The impact ball (47) impacts the collision receiving plate (45). The collision receiving plate (45) drives the push ratchet head (44) to swing. Each swing of the push ratchet head (44) pushes the ratchet gear (41) to rotate clockwise once. S3. The rotation of the ratchet gear (41) drives the rotating column (43) and the wire reel (42) to rotate. The wire reel (42) gradually winds up the pull rope (54) through the magnetic repulsion between the magnetic block (56) and the card head (403). The pull rope (54) pulls the sliding column two (53), and the piston one (57) and the piston two (58) move towards both ends simultaneously to inhale air from the communicating pipe (33). S4. When the draw rope (54) is wound to the position of the magnetic disc (55), the magnetic disc (55) attracts the chuck (403) to retract into the limit groove (402). Under the action of the spring, the first piston (57) and the second piston (58) slide back to the central position simultaneously. When the second piston (58) loses the block of the second blocking head (504), it rebounds faster than the first piston (57). The air in the support column (36) is extracted through the negative pressure pipe (34) and the annular pipe (35), causing the suction airbag (31) to deflate; S5. Part of the air in the suction airbag (31) is discharged through the air inlet hole (32), and part of it enters the space between the first piston (57) and the second piston (58) of the air control box (51). When the first piston (57) slides back in place, it pushes the first blocking head (502) to rotate, releases the block on the second piston (58), and at the same time pulls the linkage rope (501) to make the second blocking head (504) rotate; S6. As the space between the first piston (57) and the second piston (58) gradually decreases, the air is ejected from the jet pipe (59) and sprayed onto the gas detection sensor assembly for detection. The whole process is carried out in a cycle, and the newly inhaled air is used for each detection; S7. When the gas detection sensor assembly detects that the gas concentration ejected from the jet pipe (59) exceeds the set value, the portable gas monitor (11) emits an alarm signal. When the gas monitor emits an alarm signal, the operator should immediately stop the operation and evacuate to a safe area.

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