Gas monitoring device and method for underground mines

Abstract

The present invention relates to the field of gas detection technology, and discloses a gas monitoring device and method for use in underground mines. The gas monitoring device for use in underground mines includes a portable gas monitor. An active suction mechanism is provided on the front of the portable gas monitor. The active suction mechanism includes a residual cleaning mechanism, a flow control component and two shaking components. The residual cleaning mechanism includes an suction airbag. An air inlet hole is provided on the inner ring wall of the suction airbag, and a plurality of interconnected support columns are provided on the inner wall. The present invention follows the shaking of the worker's body through the shaking component, and each detection uses newly inhaled air, avoiding the error accumulation that may be 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 status in the mine in real time, which helps the workers to understand the safety status of the current environment in a timely manner.

Description

Technical Field

[0001] The present invention relates to the field of gas detection, and more particularly 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. It plays an irreplaceable role in preventing gas explosions and protecting the lives of miners. Equipment that analyzes underground coal mine gas can accurately detect the concentrations of gas such as gas, oxygen, and carbon dioxide in the mine, and can provide real-time data monitoring.

[0003] Portable gas detectors are small and lightweight, making them easy for workers to carry around for real-time testing. When the concentration of harmful gases exceeds the standard, the device can sound an alarm, reminding workers to take timely measures to avoid accidents.

[0004] When working in a mine, the gas monitor worn on the chest of the worker undertakes the important task of regularly detecting the air. In actual operation, the air inhaled during each test cannot be completely discharged after the test is completed, resulting in a portion of the air sample remaining from the previous test during the next test. The remaining air sample may contain gas components from the previous test, which will interfere with the new test results and cause inaccurate test data. To this end, we propose a gas monitoring device and method for use in underground mines. Summary of the Invention

[0005] The present invention provides a gas monitoring device and method for underground mines, which solves the technical problem in related technologies that residual air samples may contain gas components from the previous detection, which will interfere with the new detection results and lead to inaccurate detection data.

[0006] A first aspect of the present invention provides a gas monitoring device for use in underground mines, comprising a portable gas monitor, wherein the front of the portable gas monitor is provided with an active air suction mechanism, the active air suction mechanism comprising a residual cleaning mechanism, a flow control component, and two shaking follower components;

[0007] The residual cleaning mechanism includes an air suction bag, the inner ring wall of which is provided with an air inlet hole, and the inner wall of which is provided with a plurality of interconnected support columns;

[0008] The flow control component includes a piston 1 and a piston 2, the suction airbag is connected to the space between the piston 1 and the piston 2, and the support column is connected to the space on one side of the piston 2;

[0009] Each follow-up component includes a counterweight ball and a driving component. The counterweight ball swings as the staff moves in the mine, and pulls piston one and piston two toward each other through the driving component. The air sucked into the mine enters the space between piston one and piston two through the air inlet hole, and then the air in the support column is drawn into the space on the side of piston two through the resetting action of piston two, causing the suction airbag to collapse, and then the air in the suction airbag is squeezed into the space between piston one and piston two for detection by the gas detection sensor assembly. Newly inhaled air is used for each detection.

[0010] Furthermore, the active suction mechanism also includes an assembly box, an air suction port is opened 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 suction port are located at the same position, and the suction airbag is fixedly connected to the inner wall of the suction port, the structure of the inner box is a mouth shape, and the suction airbag is surrounded by the inner box.

[0011] Furthermore, the residual cleaning mechanism also includes a connecting tube, through which the suction airbag is connected to the space between piston one and piston two. An annular tube is arranged between several support columns, and the air outlet end of the annular tube is connected to a negative pressure tube. The end of the negative pressure tube away from the annular tube is connected to the space on the side of piston two.

[0012] Furthermore, the flow control part also includes an air control box, piston one and piston two are both slidably connected to the inside of the air control box, a sliding column two is fixedly provided on the side of piston one away from piston two, a sliding column one is fixedly provided on the side of piston two away from piston one, and both sliding column one and sliding column two pass through the air control box, and springs are sleeved on both sliding column one and sliding column two.

[0013] Furthermore, a blocking head 1 is rotatably provided on the inner upper wall of the air control box, and a connecting control rope and a spring 1 are fixedly provided on the end of the blocking head 1 close to the piston 1, and a blocking head 2 is fixedly provided on the end of the connecting control rope away from the blocking head 1, and the blocking head 2 is rotatably connected to the inner upper wall of the air control box, and a spring 2 is fixedly provided on the end of the blocking head 2 close to the connecting control rope.

[0014] Furthermore, the air outlet end of the air control box is connected to an air jet pipe, an end of the air jet pipe away from the air control box is aligned with the gas detection sensor assembly, and the air outlet end of the air jet pipe does not contact the gas detection sensor assembly.

[0015] Furthermore, one end of the sliding column 2 away from the piston 1 is fixedly connected to a pull rope, a magnetic sheet is wrapped at a position four-fifths of the pull rope, and a magnetic block is fixedly provided at the other end of the pull rope away from the piston 1.

[0016] Furthermore, the follow-up member also includes a ratchet gear, a winding wheel is movably provided on one side of the ratchet gear, a follow-up column fixedly connected to the center of the ratchet gear is provided inside the winding wheel for rotation, the winding wheel is fixedly connected to the magnetic block, and a card slot and a limit slot are provided on the contact surface between the follow-up column and the winding wheel, and a card head is provided for sliding inside the limit slot.

[0017] Furthermore, a ratchet head is provided above the ratchet gear, and a collision plate is fixedly provided above the ratchet head. The collision plate is Y-shaped, and a vertical line is fixedly provided on the counterweight ball. An impact ball is fixedly provided on one end of the vertical line close to the collision plate, and a connecting column is rotatably connected between the two counterweight balls of the shaking parts.

[0018] A second aspect of the present invention provides a method for using a gas monitoring device in an underground mine, comprising the following steps:

[0019] S1. Wear the portable gas monitor on your chest while entering the mine. The counterweight ball will swing as the worker moves. The connecting column will keep the two counterweight balls swinging in the same direction and amplitude.

[0020] S2. The swing of the weighted ball drives the vertical line and the impact ball to swing. The impact ball hits the impacted plate, and the impacted plate drives the push ratchet head to swing. Each swing of the push ratchet head drives the ratchet gear to rotate clockwise.

[0021] S3, the ratchet gear rotates to drive the rotating column and the winding wheel to rotate. The winding wheel gradually reels the rope through the magnetic repulsion between the magnetic block and the clamping head. The rope pulls the sliding column 2, and the pistons 1 and 2 move to both ends at the same time, sucking air from the connecting pipe;

[0022] S4. When the pull rope is reeled in to the magnetic plate position, the magnetic plate attracts the clamping head to retract into the limit slot. Under the action of the spring, pistons 1 and 2 simultaneously slide back to the center position. When piston 2 loses the resistance of blocking head 2, it rebounds faster than piston 1, extracting air from the support column through the negative pressure tube and the annular tube, causing the suction bag to collapse.

[0023] S5. Part of the air in the airbag is discharged from the air inlet hole, and part enters the space between piston 1 and piston 2 of the air control box. When piston 1 slides back to its original position, it pushes blocking head 1 to rotate, releasing the blockage on piston 2 and simultaneously pulling the control rope to rotate blocking head 2.

[0024] S6. As the space between piston 1 and piston 2 gradually decreases, air is ejected from the air jet pipe and sprayed onto the gas detection sensor assembly for detection. The whole process is repeated, and each detection uses newly inhaled air;

[0025] S7. When the gas detection sensor assembly detects that the gas concentration ejected from the jet pipe exceeds the set value, the portable gas monitor will send out an alarm signal. When the gas monitor sends out an alarm signal, the operator should immediately stop the operation and evacuate to a safe area.

[0026] The beneficial effects of the present invention are:

[0027] The present invention uses newly inhaled air for each detection by using a shaking member that follows the worker's body, thus avoiding the accumulation of errors that may result from the repeated use of old air. This improves the accuracy and reliability of gas monitoring. The newly inhaled air can reflect the gas environment conditions in the mine in real time, helping workers to promptly understand the safety conditions of the current environment and take corresponding safety measures. It avoids the use of contaminated or already tested air, reduces the interference of external factors on the gas detection sensor assembly, and improves the accuracy of the detection results.

[0028] Through the active air intake controlled by the shaking parts, the test samples can be updated more frequently, potential gas safety hazards can be discovered in time, and more timely safety warnings can be provided to the staff, thus enhancing the safety of mine operations. No matter where the staff moves in the mine, as long as the body shakes, the active suction mechanism can be driven to work, which improves the adaptability and flexibility of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the overall structure of the gas monitoring equipment for underground mines of the present invention;

[0030] Figure 2 This is a schematic diagram of the connection structure between the air intake port and the air intake airbag of the gas monitoring equipment for underground mines of the present invention;

[0031] Figure 3 This is a schematic diagram of the structure of an assembly box of a gas monitoring device for underground mines according to the present invention;

[0032] Figure 4 This is a schematic diagram of the inner box structure of the gas monitoring equipment for underground mines of the present invention;

[0033] Figure 5 This is a schematic diagram of the internal structure of the inner box of the gas monitoring equipment for underground mines of the present invention;

[0034] Figure 6 Schematic diagram of the ratchet gear structure of the gas monitoring device for underground mines of the present invention;

[0035] Figure 7 This is a schematic diagram of the structure of the reel of the gas monitoring equipment for underground mines of the present invention;

[0036] Figure 8The present invention is a gas monitoring device for underground mines Figure 7 A in the middle is an enlarged schematic diagram;

[0037] Figure 9 This is a schematic diagram of the internal structure of the gas control box of the gas monitoring equipment for underground mines of the present invention;

[0038] Figure 10 This is a schematic diagram of the internal structure of the air intake bag of the gas monitoring equipment for underground mines of the present invention;

[0039] Figure 11 It is a schematic structural diagram of the blocking head of the gas monitoring equipment for underground mines according to the present invention.

[0040] Figure: 11, portable gas monitor; 12, hanging clip; 2, active suction mechanism; 21, assembly box; 22, suction port; 23, inner box; 3, residual cleaning mechanism; 31, suction airbag; 32, air inlet; 33, connecting pipe; 34, negative pressure pipe; 35, annular pipe; 36, support column; 4, follow-up member; 41, ratchet gear; 42, winding wheel; 43, rotating column; 44, push ratchet head; 45, collision plate; 46, vertical line ; 47. Impact ball; 48. Counterweight ball; 49. Connecting column; 401. Slot; 402. Limiting slot; 403. Clamp; 51. Air control box; 52. Sliding column one; 53. Sliding column two; 54. Pull rope; 55. Magnetic sheet; 56. Magnetic block; 57. Piston one; 58. Piston two; 59. Jet tube; 501. Joint control rope; 502. Blocking head one; 503. Spring one; 504. Blocking head two; 505. Spring two. DETAILED DESCRIPTION

[0041] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed solely to enable those skilled in the art to better understand and implement the subject matter described herein, and that the functions and arrangements of the elements discussed may be varied without departing from the scope of this specification. Various examples may omit, substitute, or add various processes or components as needed. In addition, features described with respect to some examples may also be combined in other examples.

[0042] like Figure 1 、 Figure 2 、 Figure 3 and Figure 5 As shown, a gas monitoring device for underground mines includes a portable gas monitor 11. The front of the portable gas monitor 11 is provided with an active suction mechanism 2. The active suction mechanism 2 includes a residual cleaning mechanism 3, a flow control component and two shaking components 4.

[0043] The residual cleaning mechanism 3 includes an air suction bag 31, an air inlet hole 32 is opened on the inner ring wall of the air suction bag 31, and a plurality of interconnected support columns 36 are provided on the inner wall;

[0044] The flow control member includes a piston 1 57 and a piston 2 58. The spaces between the suction airbag 31 and the piston 1 57 and the piston 2 58 are interconnected, and the support column 36 is interconnected with the space on one side of the piston 2 58.

[0045] Each follow-up member 4 includes a counterweight ball 48 and a driving member. The counterweight ball 48 swings as the staff moves in the mine, and the driving member pulls piston 1 57 and piston 2 58 to move toward each other. The air sucked into the mine enters the space between piston 1 57 and piston 2 58 through the air inlet 32, and then the air in the support column 36 is drawn into the space on the side of piston 2 58 through the resetting action of piston 2 58, causing the suction airbag 31 to collapse, and then the air in the suction airbag 31 is squeezed into the space between piston 1 57 and piston 2 58 for detection by the gas detection sensor assembly. Newly inhaled air is used for each detection.

[0046] like Figure 4 、 Figure 5 、 Figure 6 and Figure 7 As shown, the active suction mechanism 2 also includes an assembly box 21, an air intake 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 suction airbag 31 and the suction port 22 are located at the same position, and the suction airbag 31 is fixedly connected to the inner wall of the suction port 22, the structure of the inner box 23 is a U-shaped, and the suction airbag 31 is surrounded by the inner box 23.

[0047] The hanging clip 12 is set on the back of the portable gas monitor 11. Workers entering the mine can hang the portable gas monitor 11 on their chests and assemble the assembly box 21 and the portable gas monitor 11 together, so that the injection tube 59 is aligned with the gas detection sensor assembly.

[0048] The residual cleaning mechanism 3 also includes a connecting pipe 33, through which the suction airbag 31 is connected to the space between piston one 57 and piston two 58. An annular tube 35 is arranged between several support columns 36, and the air outlet end of the annular tube 35 is connected to a negative pressure tube 34. The end of the negative pressure tube 34 away from the annular tube 35 is connected to the space on one side of piston two 58.

[0049] like Figure 9 、 Figure 10 and Figure 11As shown, the flow control part also includes an air control box 51, and piston one 57 and piston two 58 are both slidably connected to the inside of the air control box 51. A sliding column two 53 is fixedly provided on the side of piston one 57 away from piston two 58, and a sliding column one 52 is fixedly provided on the side of piston two 58 away from piston one 57. Both sliding column one 52 and sliding column two 53 pass through the air control box 51, and springs are sleeved on both sliding column one 52 and sliding column two 53.

[0050] A blocking head 502 is rotatably provided on the inner upper wall of the air control box 51, and a connecting control rope 501 and a spring 503 are fixedly provided on the end of the blocking head 502 close to the piston 57. A blocking head 2 504 is fixedly provided on the end of the connecting control rope 501 away from the blocking head 1 502, and the blocking head 2 504 is rotatably connected to the inner upper wall of the air control box 51, and a spring 2 505 is fixedly provided on the end of the blocking head 2 504 close to the connecting control rope 501.

[0051] The air outlet end of the air control box 51 is connected to an air injection pipe 59 . One end of the air injection 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 injection pipe 59 does not contact the gas detection sensor assembly.

[0052] The end of the sliding column 2 53 away from the piston 1 57 is fixedly connected to the pull rope 54, and a magnetic piece 55 is wrapped at the four-fifths position of the pull rope 54. The end of the pull rope 54 away from the piston 1 57 is fixedly provided with a magnetic block 56.

[0053] like Figure 5 、 Figure 6 、 Figure 7 and Figure 8 As shown, the follower member 4 also includes a ratchet gear 41, and a winding wheel 42 is movably provided on one side of the ratchet gear 41. The internal rotation of the winding wheel 42 is provided with a follower column 43 fixedly connected to the center of the ratchet gear 41. The winding wheel 42 is fixedly connected to the magnetic block 56. The contact surface between the follower column 43 and the winding wheel 42 is provided with a card slot 401 and a limit slot 402, and the internal sliding of the limit slot 402 is provided with a card head 403.

[0054] A ratchet head 44 is provided above the ratchet gear 41, and a collision plate 45 is fixedly provided above the ratchet head 44. The collision plate 45 is Y-shaped, and a vertical line 46 is fixedly provided on the counterweight ball 48. An impact ball 47 is fixedly provided on one end of the vertical line 46 close to the collision plate 45. A connecting column 49 is rotatably connected between the two counterweight balls 48 of the swinging member 4.

[0055] When a worker wears the portable gas monitor 11 on his chest and enters a mine to work, the two counterweight balls 48 swing along with the worker's body movements. The connecting column 49 causes the two counterweight balls 48 to swing in the same direction and with the same amplitude. The swing of the counterweight balls 48 drives the vertical line 46 to swing. When the vertical line 46 swings, the impact ball 47 swings in the impact plate 45 and impacts the impact plate 45, thereby driving the push ratchet head 44 to swing. The swing of the push ratchet head 44 causes the ratchet gear 41 to rotate clockwise once each swing.

[0056] The ratchet gear 41 drives the rotating column 43 to rotate. Due to the mutual repulsion between the magnet block 56 and the clamping head 403, the clamping head 403 extends from the limiting groove 402 and is clamped in the clamping groove 401, thereby driving the winding wheel 42 to rotate through the rotating column 43, and gradually winding the pull rope 54 through the winding wheel 42. The pull rope 54 gradually pulls the sliding column 2 53, and the other following member 4 has the same working process, pulling the sliding column 1 52, so that the piston 1 57 and the piston 2 58 move to both ends at the same time. During this sliding, air is sucked from the connecting pipe 33. Both the connecting pipe 33 and the air injection pipe 59 are equipped with one-way valves, and the connecting pipe 33 and the air injection pipe 59 can only release air.

[0057] When the pull rope 54 is wound to the position of the magnetic plate 55, the magnetic plate 55 attracts the clamping head 403, causing the clamping head 403 to retract into the limiting groove 402. At this time, under the action of the spring, the piston 1 57 and the piston 2 58 are driven to slide back to the center position at the same time, and at the same time drive the winding wheel 42 to release the wound pull rope 54. The clamping head 403 is extended from the limiting groove 402 and clamped into the clamping groove 401 again, facilitating the next round of work.

[0058] When the piston 1 57 slides to the position of the blocking head 1 502, it pushes the blocking head 1 502 to rotate, and at the same time pulls the linked control rope 501, pulling the blocking head 2 504 to rotate, releasing the blockage on the piston 2 58. The spring force on the side of the piston 2 58 is greater than the spring on the side of the piston 1 57. When the piston 2 58 loses the blockage of the blocking head 2 504, the piston 2 58 rebounds faster than the piston 1 57. When the piston 2 58 rebounds, the air in the support column 36 is extracted through the negative pressure tube 34 and the annular tube 35, thereby deflating the suction airbag 31. Part of the air in the suction airbag 31 is discharged through the air inlet 32, and part enters the space between the piston 1 57 and the piston 2 58 of the air control box 51.

[0059] As piston 1 57 returns to its original position and slides, the air in the space between piston 1 57 and piston 2 58 can be sprayed from the air injection pipe 59 onto the gas detection sensor assembly for detection.

[0060] A method for using a gas monitoring device in an underground mine, comprising the following steps:

[0061] S1. Wear the portable gas monitor 11 on your chest and enter the mine. The counterweight balls 48 will swing as the worker moves. The connecting column 49 keeps the two counterweight balls 48 swinging in the same direction and with the same amplitude.

[0062] S2, the swing of the weighted ball 48 drives the vertical line 46 and the impact ball 47 to swing, the impact ball 47 hits the impacted plate 45, and the impacted plate 45 drives the push ratchet head 44 to swing, and each swing of the push ratchet head 44 drives the ratchet gear 41 to rotate clockwise;

[0063] S3, the ratchet gear 41 rotates, driving the follower column 43 and the winding wheel 42 to rotate. The winding wheel 42 gradually reels the pull rope 54 through the magnetic repulsion between the magnet 56 and the clamping head 403. The pull rope 54 pulls the slide column 2 53, and the piston 1 57 and the piston 2 58 move toward both ends at the same time, sucking air from the connecting pipe 33;

[0064] S4. When the pull rope 54 is reeled in to the position of the magnetic plate 55, the magnetic plate 55 attracts the clamping head 403 and retracts it into the limiting groove 402. Under the action of the spring, the piston 1 57 and the piston 2 58 simultaneously slide back to the center position. When the piston 2 504 is no longer blocked, it rebounds faster than the piston 1 57. The air in the support column 36 is pumped out through the negative pressure tube 34 and the annular tube 35, causing the suction bag 31 to collapse.

[0065] S5. Part of the air in the airbag 31 is discharged from the air inlet 32, and part of the air enters the space between the piston 1 57 and the piston 2 58 of the air control box 51. When the piston 1 57 slides back, it pushes the blocking head 1 502 to rotate, releasing the blockage on the piston 2 58 and simultaneously pulling the control rope 501 to rotate the blocking head 2 504.

[0066] S6. As the space between piston 1 57 and piston 2 58 gradually decreases, air is ejected from the air jet pipe 59 and sprayed onto the gas detection sensor assembly for detection. The whole process is repeated, and each detection uses newly inhaled air;

[0067] S7. When the gas detection sensor assembly detects that the concentration of gas ejected from the jet pipe 59 exceeds the set value, the portable gas monitor 11 sends an alarm signal. The gas monitor sends an alarm signal, and the operator should immediately stop the operation and evacuate to a safe area.

[0068] The above describes the embodiments of this embodiment, but this embodiment is not limited to the above specific implementation methods. The above specific implementation methods are merely illustrative and not restrictive. Ordinary technicians in this field can also make many forms based on the inspiration of this embodiment, all of which are protected by this embodiment.

Claims

1. A gas monitoring device for use in underground mines, comprising a portable gas monitor (11), characterized in that: An active air suction mechanism (2) is provided on the front of the portable gas monitor (11), and the active air suction mechanism (2) includes a residual cleaning mechanism (3), a flow control component, and two shaking components (4); The residual cleaning mechanism (3) includes an air suction bag (31), an air inlet hole (32) is provided on the inner ring wall of the air suction bag (31), and a plurality of interconnected support columns (36) are provided on the inner wall of the air suction bag (31); The flow control part includes a piston 1 (57), a piston 2 (58) and an air control box (51), the spaces between the air suction bag (31) and the piston 1 (57) and the piston 2 (58) are interconnected, and the space between the support column (36) and the side of the piston 2 (58) is interconnected, and the piston 1 (57) and the piston 2 (58) are both slidably connected to the inside of the air control box (51), and a sliding column 2 (53) is fixedly provided on the side of the piston 1 (57) away from the piston 2 (58), and a sliding column 1 (52) is fixedly provided on the side of the piston 2 (58) away from the piston 1 (57), and both the sliding column 1 (52) and the sliding column 2 (53) are penetrated by the air control box (51), and a spring is sleeved on the upper part of the sliding column 1 (52) and the sliding column 2 (53); The end of the second sliding column (53) away from the first piston (57) is fixedly connected to a pull rope (54), and the first sliding column (52) is connected to the pull rope (54) in the same manner. A magnetic piece (55) is wrapped at a position four-fifths of the pull rope (54), and a magnetic block (56) is fixedly provided at the end of the pull rope (54) away from the first piston (57) and the second piston (58); Each follower member (4) includes a weighted ball (48) and a ratchet gear (41), the ratchet gear (41), a winding wheel (42) movably provided on one side of the ratchet gear (41), a rotating column (43) fixedly connected to the center of the ratchet gear (41) provided inside the winding wheel (42), the winding wheel (42) is fixedly connected to the magnetic block (56), a clamping groove (401) and a limiting groove (402) are provided on the contact surface between the rotating column (43) and the winding wheel (42), and a clamping head (403) is slidably provided inside the limiting groove (402); A push ratchet head (44) is provided above the ratchet gear (41), a collision plate (45) is fixedly provided above the push ratchet head (44), the collision plate (45) is Y-shaped, a vertical line (46) is fixedly provided on the counterweight ball (48), an impact ball (47) is fixedly provided on one end of the vertical line (46) close to the collision plate (45), and a connecting column (49) is rotatably connected between the two counterweight balls (48) of the shaking member (4); The counterweight ball (48) swings as the workers move in the mine, and the pull rope (54) is wound up through the ratchet gear (41) and the reel (42), thereby pulling the piston one (57) and the piston two (58) to move toward both ends. The air sucked into the mine enters the space between the piston one (57) and the piston two (58) through the air inlet (32), and then the air in the support column (36) is sucked into the space on the side of the piston two (58) through the reset action of the piston two (58), causing the suction airbag (31) to collapse, and then the air in the suction airbag (31) is squeezed into the space between the piston one (57) and the piston two (58) for detection by the gas detection sensor assembly. Newly inhaled air is used for each detection.

2. The gas monitoring device for underground mines according to claim 1, characterized in that: The active suction mechanism (2) further comprises an assembly box (21), an air suction port (22) is provided at the center of the assembly box (21), an inner box (23) is fixedly provided inside the assembly box (21), the centers of the air suction bag (31) and the air suction port (22) are located at the same position, and the air suction bag (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 air suction bag (31) is surrounded by the inner box (23).

3. The gas monitoring device for underground mines according to claim 2, characterized in that: The residual cleaning mechanism (3) further includes a connecting pipe (33), the suction air bag (31) is connected to the space between the first piston (57) and the second piston (58) through the connecting pipe (33), an annular tube (35) is provided between the plurality of support columns (36), the outlet end of the annular tube (35) is connected to a negative pressure tube (34), and the end of the negative pressure tube (34) away from the annular tube (35) is connected to the space on one side of the second piston (58).

4. The gas monitoring device for underground mines according to claim 3, characterized in that: The inner upper wall of the air control box (51) is rotatably provided with a blocking head 1 (502), and the end of the blocking head 1 (502) close to the piston 1 (57) is fixedly provided with a control rope (501) and a spring 1 (503), and the end of the control rope (501) away from the blocking head 1 (502) is fixedly provided with a blocking head 2 (504), and the blocking head 2 (504) is rotatably connected to the inner upper wall of the air control box (51), and the end of the blocking head 2 (504) close to the control rope (501) is fixedly provided with a spring 2 (505).

5. The gas monitoring device for underground mines according to claim 4, characterized in that: The air outlet end of the air control box (51) is connected to an air jet pipe (59), and one end of the air jet 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 jet pipe (59) does not contact the gas detection sensor assembly.

6. A method for using the gas monitoring device for underground mines according to claim 5, characterized in that: The following steps are involved: S1. Wearing the portable gas monitor (11) on the chest and entering the mine, the counterweight ball (48) shakes as the worker moves, and the connecting column (49) keeps the two counterweight balls (48) shaking in the same direction and with the same amplitude; S2, the swing of the counterweight ball (48) drives the vertical line (46) and the impact ball (47) to swing, the impact ball (47) hits the impact plate (45), and the impact plate (45) drives the push ratchet head (44) to swing, and each swing of the push ratchet head (44) drives the ratchet gear (41) to rotate clockwise; S3, the ratchet gear (41) rotates to drive the rotating column (43) and the winding wheel (42) to rotate, and the winding wheel (42) gradually reels the pull rope (54) through the magnetic repulsion between the magnetic block (56) and the clamping head (403), and the two pull ropes (54) respectively pull the sliding column 2 (53) and the sliding column 1 (52), and the piston 1 (57) and the piston 2 (58) move to both ends at the same time, sucking air from the connecting pipe (33); S4. When the pull rope (54) is reeled to the position of the magnetic sheet (55), the magnetic sheet (55) attracts the clamping head (403) to retract into the limiting groove (402). Under the action of the spring, the piston 1 (57) and the piston 2 (58) slide back to the center position at the same time. When the piston 2 (58) loses the blocking of the blocking head 2 (504), it rebounds faster than the piston 1 (57). The air in the support column (36) is extracted through the negative pressure tube (34) and the annular tube (35), causing the suction bag (31) to collapse. S5. A portion of the air in the airbag (31) is discharged from the air inlet (32), and a portion enters the space between the piston 1 (57) and the piston 2 (58) of the air control box (51). When the piston 1 (57) slides back, it pushes the blocking head 1 (502) to rotate, releasing the blocking of the piston 2 (58), and at the same time pulls the control rope (501) to rotate the blocking head 2 (504); S6. As the space between piston 1 (57) and piston 2 (58) gradually decreases, air is ejected from the air jet pipe (59) and sprayed onto the gas detection sensor assembly for detection. The entire process is repeated, and each detection uses newly inhaled air; S7. When the gas detection sensor assembly detects that the concentration of the gas ejected from the jet pipe (59) exceeds the set value, the portable gas monitor (11) sends an alarm signal, and the operator should immediately stop the operation and evacuate to a safe area.

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