Buried methane detector

Abstract

This invention relates to a detection device, and more particularly to a buried methane detector, comprising a first housing, a central processing unit disposed within the first housing, a laser transceiver assembly, a laser reflector, a first driving assembly, and a water immersion sensor disposed on the outer wall of the first housing. The laser reflector is connected to the first driving assembly and divides the inner cavity of the first housing into a detection cavity and a protection cavity. The first driving assembly can drive the laser reflector to rotate. A first through hole is provided on the side wall of the first housing at a position corresponding to the detection cavity. The other parts of the first housing are closed. The laser transceiver assembly, the first driving assembly, and the water immersion sensor are all connected to the central processing unit. This invention can prevent ground moisture from seeping in and damaging the laser reflector, and avoid contamination of the reflective surface of the laser reflector.

Description

Technical Field

[0001] The invention relates to a detection device, in particular to a buried methane detector. Background Art

[0002] The buried methane detector is a gas detection device based on TDLAS technology, which is mainly used to detect whether there is methane leakage in the buried natural gas pipeline under the road surface. The detection principle of the buried methane detector is to emit a laser beam to the reflector through a laser transmitter, and the laser receiver receives the laser beam after the reflector reflects it. When there is methane gas in the laser light path, the signal intensity received by the laser receiver will be attenuated. The greater the concentration of methane gas, the more serious the laser attenuation.

[0003] During the use of the buried methane detector, if water enters the detection pipeline area, it will cause abnormal readings of the buried methane detector, and after the water fades, stains will remain on the reflective mirror surface. The abnormal detection result data of the buried methane detector will cause false alarm information. Therefore, a methane detector that can avoid water vapor interference is urgently needed. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a buried methane detector which can prevent ground moisture from penetrating into the laser reflecting device and causing damage, and avoid inaccurate measurement results caused by contamination of the reflecting surface of the laser reflecting device.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a buried methane detector, comprising a first shell, a central processing unit arranged in the first shell, a laser transceiver assembly, a laser reflecting device, a first driving assembly and a water immersion sensor arranged on the outer wall of the first shell, the laser transceiver assembly is used to transmit laser to the laser reflecting device and receive the laser reflected back by the laser reflecting device, the laser reflecting device has a reflecting surface, the laser reflecting device is connected to the first driving assembly, the laser reflecting device divides the inner cavity of the first shell into a detection cavity and a protection cavity, and the first driving assembly can drive the laser reflecting device to rotate so that the laser reflecting device The reflecting surface faces the laser transceiver assembly or the protective cavity, the laser transceiver assembly is located in the detection cavity, a first through hole is provided on the side wall of the first shell at a position corresponding to the detection cavity, and other parts of the first shell are closed, the laser transceiver assembly, the first drive assembly, and the water immersion sensor are all connected to the central processing unit, the water immersion sensor transmits the detected water immersion signal to the central processing unit, and when the moisture value transmitted by the water immersion sensor reaches a preset value of the central processing unit, the central processing unit controls the first drive assembly to drive the laser reflecting device to flip, and controls the laser transceiver assembly to stop working.

[0006] The buried methane detector of the present invention also includes an opening and closing device, which includes a second shell and a second drive component, the second drive component is connected to the central processing unit, and the central processing unit controls the second drive component to drive the second shell to rotate or stop rotating. The first shell is cylindrical, and a plurality of first through holes are provided. The plurality of first through holes are evenly distributed along the circumference of the first shell, and each of the first through holes extends along the length direction of the first shell. The opening and closing device includes a second shell, and a second through hole is provided on the second shell. The second through hole corresponds to the first through hole, and the spacing between two adjacent second through holes is greater than or equal to the width of the first through hole. The second shell is arranged in the detection cavity and is in contact with the first shell. The second shell rotates relative to the first shell to open or close the first through hole.

[0007] The buried methane detector of the present invention, wherein the second driving component includes a second motor and an internal gear, the internal gear is arranged at the driving end of the second motor, a ring gear is arranged at one end of the second shell, the internal gear cooperates with the ring gear, and the second motor is connected to the central processing unit.

[0008] The buried methane detector of the present invention, wherein the laser reflection device is a reflection mirror.

[0009] The buried methane detector of the present invention, wherein the first rotating shaft and the second rotating shaft are respectively arranged on both sides of the laser reflecting device, the first shell inner wall is provided with a first mounting boss and a second mounting boss, the first rotating shaft is arranged on the first mounting boss, the first rotating shaft can rotate relative to the first mounting boss, the second rotating shaft is arranged on the second mounting boss, the second rotating shaft can rotate relative to the second mounting boss, the first driving component is arranged in the protective cavity, the first driving component includes a first driving motor, a first driving wheel, a first driven wheel, and a synchronous belt, the first driving wheel is arranged at the driving end of the first driving motor, the first driven wheel is connected to the second rotating shaft, the synchronous belt is connected between the first driving wheel and the first driven wheel, and the laser reflecting device is in contact with the first mounting boss, the second mounting boss and the first shell inner wall.

[0010] The buried methane detector of the present invention, wherein a sealing strip is provided between the laser reflecting device and the inner wall of the first shell.

[0011] The buried methane detector of the present invention is characterized in that a groove is arranged on the ring side of the laser reflection device, and the sealing strip is arranged in the groove.

[0012] The buried methane detector of the present invention, wherein the first shell includes a first cylinder, a second cylinder, and a third cylinder which are connected in sequence, the first cylinder and the second cylinder, and the second cylinder and the third cylinder are both detachably connected, and the first through hole is arranged on the second cylinder.

[0013] The buried methane detector of the present invention also includes a reflective surface cleaning device, which includes a bracket, a mirror cleaning piece, and a third driving component. The mirror cleaning piece is connected to the bracket, and the bracket is connected to the third driving component. The third driving component can drive the mirror cleaning piece to move up and down through the bracket to clean the reflective surface of the laser reflecting device.

[0014] The buried methane detector of the present invention, wherein the third driving component is an electric telescopic cylinder, the driving end of the electric telescopic cylinder is connected to the bracket, the electric telescopic cylinder is connected to the central processing unit, a mounting hole is provided on the first shell near the laser reflecting device, a mounting tube is detachably connected to the outer wall of the first shell corresponding to the mounting hole, the electric telescopic cylinder is arranged in the mounting tube, and when the electric telescopic cylinder is extended, it drives the bracket to pass through the mounting hole and enter the detection cavity.

[0015] Compared with the prior art, the buried methane detector of the present invention has at least the following beneficial effects:

[0016] The buried methane detector of the present invention has a water immersion sensor and a laser reflecting device on the outer wall of the first shell to divide the inner cavity of the first shell into a detection cavity and a protection cavity. The first driving component can drive the laser reflecting device to rotate so that the reflecting surface of the laser reflecting device faces the laser transceiver component or the protection cavity. The water immersion sensor, the laser transceiver component and the first driving component are all connected to the central processing unit. Therefore, when the water immersion sensor detects water leakage in the detection environment, the first driving component can drive the laser reflecting device to flip so that the reflecting surface of the laser reflecting device is in the closed protection cavity, preventing liquid with mud from penetrating into the detection cavity through the first through hole and adhering to the reflecting surface of the laser reflecting device to damage the laser reflecting device, thereby reducing the impact on methane concentration detection, and at the same time controlling the laser transceiver component to stop working, to prevent inaccurate detection results and false alarms.

[0017] The buried methane detector of the present invention will be further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the internal structure of the buried methane detector of the present invention;

[0019] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0020] Figure 3 This is an appearance diagram of the first shell of the buried methane detector of the present invention;

[0021] Figure 4 It is a schematic diagram of the connection structure between the driving device and the laser reflecting device in the buried methane detector of the present invention;

[0022] Figure 5 Another schematic diagram of the internal structure of the buried methane detector of the present invention;

[0023] Figure 6 It is a schematic diagram of the connection structure between the bracket and the mirror cleaning piece in the buried methane detector of the present invention. DETAILED DESCRIPTION

[0024] like Figure 1 , Figure 2 , Figure 3 As shown, the buried methane detector of the present invention includes a first shell 1, a central processing unit arranged in the first shell 1, a laser transceiver assembly 2, a laser reflecting device 3, a first driving assembly 6 and a water immersion sensor 8 arranged on the outer wall of the first shell 1, the laser transceiver assembly 2 includes a laser transmitter and a laser receiver arranged side by side, which are used to transmit laser to the laser reflecting device 3 and receive the laser reflected back by the laser reflecting device 3, the laser reflecting device 3 has a reflecting surface, the laser reflecting device 3 is connected to the first driving assembly 6, the laser reflecting device 3 divides the inner cavity of the first shell 1 into a detection cavity 4 and a protection cavity 5, the first driving assembly 6 can drive the laser reflecting device 3 to rotate so that the reflecting surface of the laser reflecting device 3 faces the laser transceiver assembly 2 or the protection cavity 5, the laser transceiver assembly 2 is located in the detection cavity 4, and a first through hole 1 is provided at a position corresponding to the detection cavity 4 on the side wall of the first shell 1 1, the other parts of the first shell 1 are closed, the laser transceiver assembly 2, the first drive assembly 6, and the water immersion sensor 8 are all connected to the central processing unit, and the central processing unit communicates with the main processor of the external control center through a wireless radio frequency communication device. The central processing unit is preset with a preset moisture value for the laser reflecting device 3 to reflect the laser normally, a preset moisture exceeding value for stopping the working and turning to the protection cavity 5, and a methane concentration alarm value. The water immersion sensor 8 transmits the detected water immersion signal to the central processing unit. When the moisture value transmitted by the water immersion sensor 8 reaches the preset moisture exceeding value preset by the central processing unit, the central processing unit controls the first drive assembly 6 to drive the laser reflecting device 3 to flip and control the laser transceiver assembly 2 to stop working. When the moisture value transmitted by the water immersion sensor 8 reaches the moisture value for normal working, the central processing unit controls the first drive assembly 6 to drive the laser reflecting device 3 to flip and reset.

[0025] When the buried methane detector of the present invention is working, the laser transceiver component 2 is started, the central processing unit controls the laser transceiver component 2 to emit a constant laser beam, the laser reflecting device 3 reflects the laser beam to the laser transceiver component 2, the laser transceiver component 2 detects the laser beam, and transmits the laser beam signal to the central processing unit. When there is no methane in the detection environment, the output signal received by the laser transceiver component 2 and transmitted to the central processing unit is a constant value. When there is methane leakage in the detection environment, methane enters the detection cavity 4 through the first through hole 11, and the output signal received by the laser transceiver component 2 and transmitted to the central processing unit is reduced. According to the Lambert-Beer absorption law I=I0·exp(-μCL) in the central processing unit, the methane concentration C=l can be obtained by calculation. n (I0 / I) / μL, where I is the intensity of the laser beam signal emitted by the laser transceiver component 2, I0 is the intensity of the laser beam signal received by the laser transceiver component 2, μ is the gas absorption coefficient, L is the optical path of the gas chamber, and C is the concentration of the gas to be measured, where the gas absorption coefficient and the optical path are constants. When the concentration exceeds the preset alarm value, the central processing unit sends an alarm signal.

[0026] The buried methane detector of the present invention has a water immersion sensor 8 and a laser reflecting device 3 provided on the outer wall of the first shell 1 to divide the inner cavity of the first shell 1 into a detection cavity 4 and a protection cavity 5. The first driving component 6 can drive the laser reflecting device 3 to rotate so that the reflecting surface of the laser reflecting device 3 faces the laser transceiver component 2 or the protection cavity 5. The water immersion sensor 8, the laser transceiver component 2, and the first driving component 6 are all connected to the central processing unit. Therefore, when the water immersion sensor 8 detects water leakage in the detection environment, the first driving component 6 can drive the laser reflecting device 3 to flip so that the reflecting surface of the laser reflecting device 3 is in the closed protection cavity 5, preventing the liquid containing mud from penetrating into the detection cavity 4 through the first through hole 11 and then adhering to the reflecting surface of the laser reflecting device 3 to damage the laser reflecting device 3, thereby reducing the influence on the concentration detection, and at the same time controlling the laser transceiver component 2 to stop working, to prevent the detection result from being inaccurate and causing a false alarm.

[0027] Alternatively, if Figure 1 , Figure 5As shown, the buried methane detector of the present invention also includes an opening and closing device 9, which includes a second shell 91 and a second drive assembly 96. The second drive assembly 96 is connected to the central processing unit, and the central processing unit controls the second drive assembly 96 to drive the second shell 91 to rotate or stop rotating. The first shell 1 is cylindrical, and a plurality of first through holes 11 are provided. The plurality of first through holes 11 are evenly distributed along the circumference of the first shell 1, and each first through hole 11 extends along the length direction of the first shell 1. A second through hole 92 is provided on the second shell 91, and the second through hole 92 corresponds to the first through hole 11. The spacing between two adjacent second through holes 92 is greater than or equal to the width of the first through hole 11. The second shell 91 is provided in the detection chamber 4 and is in contact with the first shell 1. The second shell 91 can rotate relative to the first shell 1 to open or close the first through hole 11. A filter is provided on the first through hole 11 to prevent mud and sand from entering the detection chamber 4. When the moisture value transmitted by the water immersion sensor 8 reaches the moisture exceeding preset value preset by the central processing unit, it is necessary to close the first through hole 11, and the second driving component 96 is controlled by the central processing unit to drive the second shell 91 to rotate. When the first through hole 11 and the second through hole 92 are completely offset, the first through hole 11 is closed. When the moisture value transmitted by the water immersion sensor 8 reaches the moisture value for normal operation and the first through hole 11 needs to be opened, the first through hole 11 and the second through hole 92 are overlapped, and the laser reflection device 3 is further prevented from being contaminated by setting the opening and closing device 9.

[0028] Optionally, the second drive assembly 96 includes a second motor 93 and an internal gear 94, wherein the internal gear 94 is disposed at the driving end of the second motor 93, a gear ring 95 is disposed at one end of the second housing 91, the internal gear 94 cooperates with the gear ring 95, and the second motor 93 is connected to the central processing unit. The second motor 93 drives the second housing 91 to rotate by rotating the gear, and has a simple structure, reliable operation, and a long service life.

[0029] Alternatively, if Figure 1 , Figure 4 , Figure 5As shown, the laser reflecting device 3 is a reflecting mirror, and a first rotating shaft 31 and a second rotating shaft 32 are respectively arranged on both sides of the laser reflecting device 3. A first mounting boss 12 and a second mounting boss 13 are arranged on the inner wall of the first shell 1. The first mounting boss 12 and the second mounting boss 13 are arranged opposite to each other. The first rotating shaft 31 is arranged on the first mounting boss 12, and the first rotating shaft 31 can rotate relative to the first mounting boss 12. The second rotating shaft 32 is arranged on the second mounting boss 13, and the second rotating shaft 32 can rotate relative to the second mounting boss The boss 13 rotates, and the first drive assembly 6 is disposed in the protective cavity 5. The first drive assembly 6 includes a first drive motor 61, a first driving wheel 62, a first driven wheel 63, and a synchronous belt 64. The first driving wheel 62 is disposed at the driving end of the first drive motor 61, and the first driven wheel 63 is connected to the second rotating shaft 32. The synchronous belt 64 is connected between the first driving wheel 62 and the first driven wheel 63. The laser reflecting device 3 is in contact with the first mounting boss 12, the second mounting boss 13, and the inner wall of the first housing 1. Specifically, the first drive motor 61, the first driving wheel 62, the first driven wheel 63, and the synchronous belt 64 are all disposed in the protective cavity 5. The second rotating shaft 32 is driven to rotate by the first driving motor 61, thereby driving the laser reflecting device 3 and the first rotating shaft 31 to rotate, so that the laser reflecting device 3 is flipped, reducing the influence of the setting of the first driving component 6 on the fit between the laser reflecting device 3 and the first mounting boss 12, the second mounting boss 13, and the first shell 1, thereby avoiding the leakage of methane gas from the detection cavity 4 to the protection cavity 5. At the same time, the first driving component 6 is driven by the synchronous belt 64, the transmission is accurate and stable, has a constant transmission ratio, is not prone to transmission shedding, and has buffering and vibration reduction capabilities.

[0030] Optionally, a sealing strip 14 is provided between the laser reflecting device 3 and the inner wall of the first housing 1 to further prevent the methane gas from leaking from the detection cavity 4 to the protection cavity 5 .

[0031] Optionally, a groove is provided on the ring side of the laser reflecting device 3, and the sealing strip 14 is provided in the groove. Specifically, the sealing strip 14 is bonded in the groove by glue, which reduces the processing accuracy requirements for the laser reflecting device 3 and the first housing 1 and reduces the processing cost.

[0032] Optionally, the first housing 1 includes a first barrel 15, a second barrel 16, and a third barrel 17 that are sequentially connected, and the first barrel 15 and the second barrel 16, and the second barrel 16 and the third barrel 17 are detachably connected, and the first through hole 11 is provided on the second barrel 16. Specifically, the first barrel 15 and the second barrel 16, and the second barrel 16 and the third barrel 17 are connected by threads, or they can be welded to each other after the internal parts are installed, so as to facilitate production and processing.

[0033] Alternatively, if Figure 5 , Figure 6As shown, it also includes a reflective surface cleaning device, which includes a bracket 33, a mirror cleaning member 34, and a third driving assembly 35. The mirror cleaning member 34 is connected to the bracket 33, and the bracket 33 is connected to the third driving assembly 35. The third driving assembly 35 can drive the mirror cleaning member 34 to move up and down through the bracket 33 so that the mirror cleaning member 34 cleans the water mist, dust and other stains on the reflective surface of the laser reflective device 3. Due to the limited gas flow between the detection cavity 4 and the protection cavity 5, the drive motor in the protection cavity 5 generates heat, resulting in a temperature difference between the detection cavity 4 and the protection cavity 5. When the laser reflective device 3 flips the reflective surface from the protection cavity 5 to the detection cavity 4, water mist appears on the reflective surface. The water mist, dust and stains are removed by the reflective surface cleaning device, further reducing the probability of errors in the buried methane detector.

[0034] Optionally, the third driving component 35 is an electric telescopic cylinder, the driving end of the electric telescopic cylinder is connected to the bracket 33, the electric telescopic cylinder is connected to the central processor, a mounting hole is provided at a position near the laser reflecting device 3 on the first shell 1, a mounting tube 36 is connected at a position corresponding to the mounting hole on the outer wall of the first shell 1, and the electric telescopic cylinder is arranged in the mounting tube 36. When the electric telescopic cylinder is extended, it drives the bracket 33 to pass through the mounting hole and enter the detection cavity 4. At this time, the mirror cleaning member 34 abuts against the reflection surface of the laser reflecting device 3, and the electric telescopic cylinder drives the bracket 33 to extend and retract until the reflection surface is cleaned. When the moisture value transmitted to the central processor by the water immersion sensor 8 reaches the moisture value for normal operation, the laser reflecting device 3 flips the reflection surface to enter the detection cavity 4 towards the laser transceiver component 2, before the laser transceiver component 2 starts to work, the central processor controls the electric telescopic cylinder to work, drives the mirror cleaning member 34 to move up and down to clean the reflection surface, and when the central processor controls the electric telescopic cylinder to complete a stroke, the central processor controls the buried detector to work normally. Specifically, the mirror cleaning member 34 and the bracket 33 are bonded to each other or connected by screws, and the mounting tube 36 is connected to the first shell 1 by threads.

[0035] The embodiments described above are merely descriptions of preferred implementation modes of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A buried methane detector, characterized in that: The invention comprises a first shell (1), a central processing unit arranged in the first shell (1), a laser transceiver assembly (2), a laser reflecting device (3), a first driving assembly (6), and a water immersion sensor (8) arranged on the outer wall of the first shell (1), wherein the laser transceiver assembly (2) is used to transmit laser light to the laser reflecting device (3) and receive laser light reflected by the laser reflecting device (3), the laser reflecting device (3) has a reflecting surface, the laser reflecting device (3) is connected to the first driving assembly (6), the laser reflecting device (3) divides the inner cavity of the first shell (1) into a detection cavity (4) and a protection cavity (5), the first driving assembly (6) can drive the laser reflecting device (3) to rotate so that the reflecting surface of the laser reflecting device (3) faces the laser transceiver assembly (2) or the protection cavity (5), and the laser reflecting device (3) is connected to the first driving assembly (6), and the laser reflecting device (3) divides the inner cavity of the first shell (1) into a detection cavity (4) and a protection cavity (5). The optical transceiver assembly (2) is located in the detection cavity (4); a first through hole (11) is provided on the side wall of the first shell (1) at a position corresponding to the detection cavity (4); the other parts of the first shell (1) are closed; the laser transceiver assembly (2), the first drive assembly (6), and the water immersion sensor (8) are all connected to the central processing unit; the water immersion sensor (8) transmits a detected water immersion signal to the central processing unit; when the moisture value transmitted by the water immersion sensor (8) reaches a preset value of the central processing unit, the central processing unit controls the first drive assembly (6) to drive the laser reflection device (3) to flip; the first drive assembly (6) can drive the laser reflection device (3) to flip so that the reflection surface of the laser reflection device (3) is in the closed protective cavity (5), and controls the laser transceiver assembly (2) to stop working.

2. The buried methane detector according to claim 1, characterized in that: The invention also comprises an opening and closing device (9), wherein the opening and closing device (9) comprises a second shell (91) and a second drive assembly (96), wherein the second drive assembly (96) is connected to the central processing unit, and the central processing unit controls the second drive assembly (96) to drive the second shell (91) to rotate or stop rotating. The first shell (1) is cylindrical, and a plurality of first through holes (11) are provided. The plurality of first through holes (11) are evenly distributed along the circumference of the first shell (1), and each of the first through holes (11) is arranged along the length of the first shell (1). The opening and closing device (9) comprises a second shell (91), the second shell (91) being provided with a second through hole (92), the second through hole (92) corresponding to the first through hole (11), the spacing between two adjacent second through holes (92) being greater than or equal to the width of the first through hole (11), the second shell (91) being arranged in the detection cavity (4) and in contact with the first shell (1), and the second shell (91) being rotated relative to the first shell (1) to open or close the first through hole (11).

3. The buried methane detector according to claim 2, characterized in that: The second driving assembly (96) comprises a second motor (93) and an internal gear (94); the internal gear (94) is arranged at the driving end of the second motor (93); a ring gear (95) is arranged at one end of the second housing (91); the internal gear (94) cooperates with the ring gear (95); and the second motor (93) is connected to the central processing unit.

4. The buried methane detector according to claim 1, characterized in that: The laser reflection device (3) is a reflection mirror.

5. The buried methane detector according to claim 4, characterized in that: A first rotating shaft (31) and a second rotating shaft (32) are respectively arranged on both sides of the laser reflecting device (3); a first mounting boss (12) and a second mounting boss (13) are arranged on the inner wall of the first shell (1); the first rotating shaft (31) is arranged on the first mounting boss (12); the first rotating shaft (31) can rotate relative to the first mounting boss (12); the second rotating shaft (32) is arranged on the second mounting boss (13); the second rotating shaft (32) can rotate relative to the second mounting boss (13); the first driving component (6) is arranged in the protective cavity (5), the first driving assembly (6) comprises a first driving motor (61), a first driving wheel (62), a first driven wheel (63), and a synchronous belt (64), the first driving wheel (62) being arranged at the driving end of the first driving motor (61), the first driven wheel (63) being connected to the second rotating shaft (32), the synchronous belt (64) being connected between the first driving wheel (62) and the first driven wheel (63), and the laser reflecting device (3) and the first mounting boss (12), the second mounting boss (13) and the inner wall of the first shell (1) are all in contact with each other.

6. The buried methane detector according to claim 5, characterized in that: A sealing strip (14) is provided between the laser reflection device (3) and the inner wall of the first shell (1).

7. The buried methane detector according to claim 6, characterized in that: A groove is provided on the ring side of the laser reflection device (3), and the sealing strip (14) is arranged in the groove.

8. The buried methane detector according to claim 1, characterized in that: The first shell (1) comprises a first cylinder (15), a second cylinder (16), and a third cylinder (17) which are connected in sequence; the first cylinder (15) and the second cylinder (16), and the second cylinder (16) and the third cylinder (17) are both detachably connected; and the first through hole (11) is provided on the second cylinder (16).

9. The buried methane detector according to claim 1, characterized in that: The invention also comprises a reflective surface cleaning device, which comprises a bracket (33), a mirror cleaning piece (34), and a third driving assembly (35). The mirror cleaning piece (34) is connected to the bracket (33), and the bracket (33) is connected to the third driving assembly (35). The third driving assembly (35) can drive the mirror cleaning piece (34) to move up and down through the bracket (33) to clean the reflective surface of the laser reflecting device (3).

10. The buried methane detector according to claim 9, characterized in that: The third driving component (35) is an electric telescopic cylinder, the driving end of the electric telescopic cylinder is connected to the bracket (33), the electric telescopic cylinder is connected to the central processing unit, a mounting hole is provided on the first shell (1) at a position close to the laser reflecting device (3), a mounting cylinder (36) is detachably connected to a position on the outer wall of the first shell (1) corresponding to the mounting hole, the electric telescopic cylinder is arranged in the mounting cylinder (36), and when the electric telescopic cylinder is extended, it drives the bracket (33) to pass through the mounting hole and enter the detection cavity (4).

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