An environmental monitoring device for a coal mining area

By incorporating a comprehensive air detection mechanism, a cleaning mechanism, and a stabilization mechanism, the system addresses the detection errors and camera instability issues caused by air stratification in coal mine environmental monitoring equipment, achieving high-precision and stable monitoring results.

CN115467714BActive Publication Date: 2026-02-17ANQING NORMAL UNIV
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Patent Information

Application Number
CN202211236019.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-10-10
Publication Date
2026-02-17
Estimated Expiration
2042-10-10

AI Technical Summary

Technical Problem

Existing coal mine environmental monitoring equipment suffers from detection errors due to air stratification, and the camera monitoring images are unstable, posing safety hazards.

Method used

It employs an all-around air detection mechanism, a cleaning mechanism, and a stabilization mechanism. The detection mechanism is driven by a tracked body to achieve all-around air detection. The camera is cleaned using a cleaning rod, and the camera is stabilized using counterweights and magnets to reduce shaking.

Benefits of technology

It improves the accuracy of air detection, ensures the cleaning efficiency of the camera and the stability of the monitoring image, and reduces detection errors and the impact of shaking.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application discloses a coal mining area environment monitoring device and belongs to the field of environment monitoring. The coal mining area environment monitoring device comprises a machine body, tracks are arranged on the two sides of the machine body, a machine box is fixedly connected to the upper end of the machine body, a camera is arranged at the front middle part of the machine box, illuminating lamps are arranged on the upper parts of the two sides of the front end of the machine box, a detection mechanism is arranged at the upper end of the front middle part of the machine box, a fan is rotatably connected to the inside center of the machine box, the detection mechanism comprises a flow guide pipe which is fixedly connected to the upper end of the front middle part of the machine box, a rotating head is spirally sleeved with the front end of the flow guide pipe, collecting pipes are fixedly connected to the upper and lower ends of the rotating head, and collecting holes are formed in the outer walls of the collecting pipes. The device can realize all-around air environment detection, avoids air stratification, reduces detection errors caused by detection of air in a certain area, improves detection accuracy, and stabilizes monitoring pictures.
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Description

Technical Field

[0001] This invention relates to the field of environmental monitoring, and more specifically, to an environmental monitoring device for coal mining areas. Background Technology

[0002] Coal mines refer to places rich in coal resources. They are generally divided into underground coal mines and open-pit coal mines. When the coal seam is far from the surface, it is generally chosen to excavate roadways underground to mine coal. This is called an underground coal mine. Coal mines contain a large amount of harmful gases, and the oxygen content gradually decreases as the depth of the mine increases. Therefore, it is necessary to monitor the coal mine environment in real time to reduce the mining danger.

[0003] Environmental monitoring equipment is an essential device for monitoring the coal mine environment. By taking pictures of the inside of the coal mine, people can quickly understand the situation inside the mine. It can also detect the air inside the coal mine to prevent the content of harmful gases in the air from exceeding the standard and the oxygen deficiency from causing danger to workers.

[0004] However, the air in coal mines has a complex composition with different densities, which can cause air stratification. Traditional monitoring equipment is usually installed at a specific height, which can lead to errors in the monitoring data and pose certain safety hazards. Summary of the Invention

[0005] 1. Technical problems to be solved

[0006] In view of the problems existing in the prior art, the purpose of this invention is to provide an environmental monitoring device for coal mining areas, which can realize comprehensive air environment detection, avoid air stratification, and prevent detection errors caused by only detecting air in a certain area, thereby improving the accuracy of detection and providing a stable monitoring screen.

[0007] 2. Technical Solution

[0008] To solve the above problems, the present invention adopts the following technical solution.

[0009] An environmental monitoring device for coal mining areas includes a body with tracks on both sides. A housing is fixedly connected to the upper end of the body. A camera is located at the center of the front end of the housing. Lights are located on the upper parts of both sides of the front end of the housing. A detection mechanism is located at the upper center of the front end of the housing. A fan is rotatably connected to the center of the housing. The detection mechanism includes a guide tube fixedly connected to the upper center of the front end of the housing. A rotating head is spirally sleeved at the front end of the guide tube. Collection tubes are fixedly connected to both the upper and lower ends of the rotating head, and the outer wall of the collection tube has a collection hole. A first traction rod is fixedly connected between the upper eccentric part of the fan's output shaft and the rotating head, and the first traction rod is located inside the guide tube. The guide tube is connected to the rotating head and the collection tube.

[0010] Furthermore, the collecting tube is composed of multiple tube sections that are slidably connected, and springs are fixedly connected between adjacent tube sections.

[0011] Furthermore, the lower part of the housing is provided with a cleaning mechanism, which includes a turntable rotatably connected to the center of the lower front part of the housing. A cleaning rod is fixedly connected to the upper end of the turntable, and a telescopic cylinder is fixedly connected to the lower rear end of the turntable. A second traction rod is fixedly connected between the telescopic cylinder and the lower eccentric part of the output shaft of the fan. The front end of the second traction rod passes through the inside of the telescopic cylinder and is slidably connected to the telescopic cylinder.

[0012] Furthermore, a cleaning roller is rotatably connected inside the cleaning rod, and the rear of the cleaning roller is in contact with the camera. A scraper is fixedly connected to the center of the inner wall of the front end of the cleaning rod, and a chip discharge port is provided on both sides of the front end of the cleaning rod.

[0013] Furthermore, the front end of the casing is provided with a stabilizing mechanism, which includes a mounting cavity opened at the front of the casing. A connecting seat is fixedly connected to the rear end of the mounting cavity. The connecting seat is rotatably connected to the camera. Counterweights are fixedly connected to both sides of the camera.

[0014] Furthermore, the stabilizing mechanism also includes magnets that are fixedly connected at equal intervals to the inner wall of the mounting cavity, and paddles that are fixedly connected at equal intervals to the outer surface of the camera inside the connector, and the interior of the connector is filled with a non-Newtonian liquid.

[0015] Furthermore, robotic arms are movably connected to both sides of the housing, and drive motors are fixedly connected to both sides of the housing corresponding to the positions of the robotic arms. A cavity is provided between the housing and the body.

[0016] Furthermore, the spring force is greater than the frictional force between adjacent pipe sections.

[0017] Furthermore, both the detection mechanism and the cleaning mechanism are made of plastic steel.

[0018] Furthermore, the magnetic attraction of the magnet to the counterweight is less than the weight of the counterweight itself.

[0019] 3. Beneficial effects

[0020] Compared with the prior art, the advantages of this invention are:

[0021] (1) This solution can achieve comprehensive air environment detection, avoid air stratification, and prevent detection errors caused by only detecting air in a certain area, thus improving the accuracy of detection.

[0022] (2) This solution uses a cleaning rod to brush off the dust adhering to the camera surface, ensuring that the camera's monitoring image is clear. At the same time, the cleaning rod rubs against the camera when it swings, and the friction drives the cleaning roller to rotate. The rotating cleaning roller rotates the cleaned side to the inside of the cleaning rod and contacts the scraper. The scraper scrapes off the dust cleaned from the surface of the cleaning roller and discharges it through the chip outlet, thereby achieving the cleaning effect of the cleaning roller and ensuring the cleaning efficiency of the cleaning roller on the camera.

[0023] (3) In this solution, the camera rotates with the connecting seat under the action of the weight of the counterweights on both sides, keeping the camera in a horizontal state, reducing the degree of camera shaking, making the monitoring image stable and easy to observe. The counterweights are attracted by magnets, so that when the body shakes significantly, the rotation of the camera is magnetically buffered, preventing the camera from rotating too fast and causing shaking. At the same time, the connection between the camera and the connecting seat is filled with non-Newtonian liquid. When the camera rotates, the tabs on its surface and the non-Newtonian liquid generate resistance, which further improves the buffering effect, reduces the rotation speed of the camera, and improves the stability of the camera monitoring image. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a top cross-sectional view of the housing of the present invention;

[0026] Figure 3 This is a schematic diagram of the structure of the collection tube of the present invention;

[0027] Figure 4 This is a bottom cross-sectional view of the housing of the present invention;

[0028] Figure 5 For the present invention Figure 4 Enlarged view of A in the middle;

[0029] Figure 6 This is a schematic diagram of the cleaning rod of the present invention;

[0030] Figure 7 This is a schematic diagram of the stabilizing mechanism of the present invention;

[0031] Figure 8 This is a view showing the camera and connector of the present invention combined.

[0032] Explanation of the labels in the diagram:

[0033] 1. Body; 2. Track; 3. Housing; 4. Camera; 5. Detection mechanism; 51. Guide pipe; 52. Rotary head; 53. Collection pipe; 54. Pipe section; 55. Spring; 56. Collection hole; 57. First traction rod; 6. Lighting lamp; 7. Robotic arm; 8. Cleaning mechanism; 81. Turntable; 82. Cleaning rod; 821. Cleaning roller; 822. Scraper; 823. Chip discharge port; 83. Second traction rod; 84. Telescopic cylinder; 9. Fan; 10. Drive motor; 11. Stabilizing mechanism; 111. Mounting cavity; 112. Connecting seat; 113. Counterweight; 114. Magnet; 115. Paddle. Detailed Implementation

[0034] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0035] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] Example 1:

[0038] Please see Figures 1-3An environmental monitoring device for coal mining areas includes a body 1, with tracks 2 on both sides of the body 1. A housing 3 is fixedly connected to the upper end of the body 1. A camera 4 is located in the middle of the front end of the housing 3. Lighting lamps 6 are located on the upper parts of both sides of the front end of the housing 3. A detection mechanism 5 is located in the upper middle of the front end of the housing 3. A fan 9 is rotatably connected to the center of the interior of the housing 3. The detection mechanism 5 includes a guide pipe 51 fixedly connected to the upper middle position of the front end of the housing 3. A rotating head 52 is spirally sleeved at the front end of the guide pipe 51. A collection pipe 53 is fixedly connected to both the upper and lower ends of the rotating head 52. A collection hole 56 is opened on the outer wall of the collection pipe 53. A first traction rod 57 is fixedly connected between the upper eccentric part of the output shaft of the fan 9 and the rotating head 52. The first traction rod 57 is located inside the guide pipe 51. The guide pipe 51 is connected to the rotating head 52 and the collection pipe 53.

[0039] The collecting tube 53 is formed by multiple tube sections 54 slidably connected together, and a spring 55 is fixedly connected between adjacent tube sections 54; the elastic force of the spring 55 is greater than the frictional force between adjacent tube sections 54.

[0040] Both sides of the housing 3 are movably connected to robotic arms 7. Inside the housing 3, on both sides corresponding to the positions of the robotic arms 7, drive motors 10 are fixedly connected. A cavity is provided between the body 1 and the housing 3.

[0041] The air in coal mines has a complex composition with different densities, which causes the air to stratify. Traditional monitoring equipment usually monitors at a specific height, which can lead to errors in the monitoring data and pose certain safety hazards.

[0042] During operation, the machine body 1 is driven by the tracks 2 to move. The camera 4 on the housing 3 monitors the mine environment, while the detection mechanism 5 detects the air composition in the mine. During detection, the fan 9 rotates, generating suction to draw air from the mine through the collection port 56 into the collection pipe 53, and then through the guide pipe 51 for detection. During detection, the rotation of the fan 9 drives the first traction rod 57 to perform an eccentric motion, causing it to reciprocate back and forth. Due to the spiral motion between the rotating head 52 and the guide pipe 51... The transmission connection, driven by the first traction rod 57, causes the rotating head 52 to rotate, which in turn drives the collection tube 53 to rotate. The collection tube 53 uses the collection hole 56 on the collection tube 53 to collect air around the machine body 1 from all directions, avoiding the phenomenon of inaccurate detection data due to air stratification, thus improving the accuracy of air detection. At the same time, the drive motor 10 can drive the robotic arm 7 to work, which can transport rescue items such as oxygen cylinders into the cavity between the machine body 1 and the machine box 3, so that they can be used by miners in case of danger in the mine.

[0043] Please see Figures 4 to 6 The lower part of the housing 3 is provided with a cleaning mechanism 8. The cleaning mechanism 8 includes a turntable 81 rotatably connected to the center of the lower front end of the housing 3. A cleaning rod 82 is fixedly connected to the upper end of the turntable 81. A telescopic cylinder 84 is fixedly connected to the lower rear end of the turntable 81. A second traction rod 83 is fixedly connected between the telescopic cylinder 84 and the lower eccentric part of the output shaft of the fan 9. The front end of the second traction rod 83 passes through the inside of the telescopic cylinder 84 and is slidably connected to the telescopic cylinder 84.

[0044] The cleaning rod 82 is rotatably connected to a cleaning roller 821, and the rear of the cleaning roller 821 is in contact with the camera 4. A scraper 822 is fixedly connected to the center of the inner wall of the front end of the cleaning rod 82. Both sides of the front end of the cleaning rod 82 are provided with a chip discharge port 823.

[0045] Both the detection mechanism 5 and the cleaning mechanism 8 are made of plastic steel.

[0046] Mining operations generate a lot of dust in the mine, and the humidity in the mine is high. This dust can easily adhere to the surface of camera 4, causing the detection image to be blocked and affecting normal monitoring.

[0047] During operation, when the fan 9 rotates, it drives the second traction rod 83 to make an eccentric movement, which in turn causes the turntable 81 to swing left and right. The turntable 81 then drives the cleaning rod 82 to swing left and right, using the cleaning rod 82 to brush off the dust adhering to the surface of the camera 4, ensuring the clarity of the monitoring image from the camera 4. At the same time, the cleaning rod 82 rubs against the camera 4 during its swing, using the friction to drive the cleaning roller 821 to rotate. The rotating cleaning roller 821 rotates the cleaned side to the inside of the cleaning rod 82, where it contacts the scraper 822. The scraper 822 scrapes off the dust cleaned from the surface of the cleaning roller 821 and discharges it through the chip discharge port 823, thus achieving the cleaning effect of the cleaning roller 821 and ensuring the cleaning efficiency of the cleaning roller 821 on the camera 4. It should be noted that both the detection mechanism 5 and the cleaning mechanism 8 are made of plastic steel to ensure the strength of the mechanism. On the other hand, the lightweight nature of the plastic steel material reduces the burden on the fan 9 drive.

[0048] Please see Figure 7 and Figure 8 The front end of the internal part of the housing 3 is provided with a stabilizing mechanism 11. The stabilizing mechanism 11 includes a mounting cavity 111 opened at the front of the housing 3. A connecting seat 112 is fixedly connected to the rear end of the mounting cavity 111. The connecting seat 112 is rotatably connected to the camera 4. Counterweights 113 are fixedly connected to both sides of the camera 4.

[0049] The stabilizing mechanism 11 also includes magnets 114 that are fixedly connected at equal intervals to the inner wall of the mounting cavity 111. The outer surface of the camera 4 is fixedly connected at equal intervals to the inside of the connecting seat 112. The inside of the connecting seat 112 is filled with a non-Newtonian liquid.

[0050] The roads in the mine are simply cleared, so the surface is uneven. Also, when transporting ore, debris falls off, causing the detection equipment to move up and down, which in turn causes the monitoring image of camera 4 to shake, affecting the monitoring effect.

[0051] During operation, when the track 2 of the machine body 1 presses against the ore during movement, the machine body 1 tilts. Under the influence of the gravity of the counterweights 113 on both sides, the camera 4 rotates with the connecting seat 112, keeping the camera 4 in a horizontal position and reducing the degree of shaking of the camera 4. This makes the monitoring image stable and easy to observe. The counterweights 113 are magnetically attracted by the magnet 114, so that when the machine body 1 shakes significantly, the rotation of the camera 4 is magnetically buffered, preventing the camera 4 from rotating too fast and causing shaking. At the same time, the connection between the camera 4 and the connecting seat 112 is filled with a non-Newtonian liquid. When the camera 4 rotates, the tabs 115 on its surface and the non-Newtonian liquid generate resistance, which further improves the buffering effect, reduces the rotation speed of the camera 4, and improves the stability of the monitoring image of the camera 4.

[0052] Working principle:

[0053] The machine body 1 is driven by tracks 2 to move. A camera 4 on the housing 3 monitors the mine environment, while a detection mechanism 5 detects the air composition. During detection, a fan 9 rotates, generating suction to draw air from the mine through a collection port 56 into a collection pipe 53, and then through a guide pipe 51 for detection. As the fan 9 rotates, it drives the first traction rod 57 to move eccentrically, causing it to reciprocate. Since the rotating head 52 is helically connected to the guide pipe 51, the first traction rod 57 pushes the rotating head 52 to rotate, which in turn drives the collection pipe 53 to rotate, utilizing the collected air... Hole 56 collects air from all directions around the machine body 1, avoiding inaccurate data due to air stratification and improving the accuracy of air detection. Simultaneously, the drive motor 10 drives the robotic arm 7 to transport rescue items such as oxygen cylinders into the cavity between the machine body 1 and the housing 3 for use by miners in case of emergency in the mine. When the fan 9 rotates, it drives the second traction rod 83 to perform an eccentric motion, causing the turntable 81 to swing left and right. The turntable 81 then drives the cleaning rod 82 to swing left and right, using the cleaning rod 82 to brush off dust adhering to the surface of the camera 4, ensuring clear monitoring images from the camera 4. At the same time, the cleaning rod 82... During the swing, friction occurs with the camera 4, and this friction drives the cleaning roller 821 to rotate. The rotating cleaning roller 821 moves its cleaned side inside the cleaning rod 82, where it contacts the scraper 822. The scraper 822 scrapes off the dust from the surface of the cleaning roller 821 and discharges it through the chip outlet 823, thus cleaning the cleaning roller 821 and ensuring its cleaning efficiency for the camera 4. It should be noted that both the detection mechanism 5 and the cleaning mechanism 8 are made of plastic steel to ensure the strength of the mechanism. Furthermore, the lightweight nature of the plastic steel reduces the burden on the fan 9 drive. When the track 2 presses against ore during the movement of the machine body 1, the machine body 1 tilts. The camera 4 is tilted, and under the gravity of the counterweights 113 on both sides, it rotates with the connecting seat 112, keeping the camera 4 in a horizontal state, reducing the degree of shaking of the camera 4, and making the monitoring image stable and easy to observe. The counterweights 113 are magnetically attracted by the magnet 114, so that when the body 1 shakes significantly, the rotation of the camera 4 is magnetically buffered, preventing the camera 4 from rotating too fast and causing shaking. At the same time, the connection between the camera 4 and the connecting seat 112 is filled with non-Newtonian liquid. When the camera 4 rotates, the tabs 115 on its surface and the non-Newtonian liquid generate resistance, which further improves the buffering effect, reduces the rotation speed of the camera 4, and improves the stability of the monitoring image of the camera 4.

[0054] All electrical components mentioned in this article are connected to the external main controller and 220V AC mains power via transformers. The main controller can be a conventional known device such as a computer for control. The product models provided in this application are only for use based on the structural characteristics of the products in this technical solution. The products will be adjusted and modified after purchase to better match and conform to the technical solution of this application. It is an optimal application of this technical solution. The product models can be replaced and modified according to the required technical parameters. It is well known to those skilled in the art. Therefore, those skilled in the art can clearly obtain the corresponding usage effect through the technical solution provided in this application.

[0055] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A coal mine mining area environment monitoring device, comprising a machine body (1), characterized in that: Both sides of the machine body (1) are provided with tracks (2), the upper end of the machine body (1) is fixedly connected with a machine box (3), the front end of the machine box (3) is provided with a camera (4), the upper part of the front end of the machine box (3) is provided with an illuminating lamp (6), the front end of the machine box (3) is provided with a detection mechanism (5), the inside of the machine box (3) is rotatably connected with a fan (9), the detection mechanism (5) comprises a flow guide pipe (51) fixedly connected to the upper end of the front end of the machine box (3), the front end of the flow guide pipe (51) is spirally sleeved with a rotating head (52), the upper and lower ends of the rotating head (52) are fixedly connected with a collecting pipe (53), and the outer wall of the collecting pipe (53) is provided with a collecting hole (56), the first traction rod (57) is fixedly connected between the eccentric upper end of the output shaft of the fan (9) and the rotating head (52), and the first traction rod (57) is located in the inside of the flow guide pipe (51), so that the rotating head (52) rotates under the pushing of the first traction rod (57), and the flow guide pipe (51) is communicated with the rotating head (52) and the collecting pipe (53).

2. The coal mine mining area environment monitoring device according to claim 1, characterized in that: The collecting pipe (53) is formed by a plurality of pipe segments (54) which are slidably connected, and the adjacent pipe segments (54) are fixedly connected with springs (55).

3. The coal mine mining area environment monitoring device according to claim 1, characterized in that: The lower part of the machine box (3) is provided with a cleaning mechanism (8), the cleaning mechanism (8) comprises a rotating disc (81) rotatably connected to the front end of the machine box (3), the upper end of the rotating disc (81) is fixedly connected with a cleaning rod (82), the rear end of the rotating disc (81) is fixedly connected with an extension cylinder (84), and the second traction rod (83) is fixedly connected between the extension cylinder (84) and the eccentric lower end of the output shaft of the fan (9), the front end of the second traction rod (83) penetrates through the inside of the extension cylinder (84) and is slidably connected between the extension cylinder (84).

4. The coal mine mining area environment monitoring device according to claim 3, characterized in that: The inside of the cleaning rod (82) is rotatably connected with a cleaning roller (821), the rear part of the cleaning roller (821) is in contact with the camera (4), the front end of the cleaning rod (82) is fixedly connected with a scraping block (822) at the center of the inner wall, and the front end of the cleaning rod (82) is provided with a chip removal opening (823) on both sides.

5. The coal mine mining area environment monitoring device according to claim 1, characterized in that: The inside of the machine box (3) is provided with a stabilizing mechanism (11), the stabilizing mechanism (11) comprises a mounting cavity (111) formed in the front part of the machine box (3), the inside of the mounting cavity (111) is fixedly connected with a connecting seat (112), the connecting seat (112) is rotatably connected with the camera (4), and the two sides of the camera (4) are fixedly connected with counterweights (113).

6. The coal mine mining area environment monitoring device according to claim 5, characterized in that: The stabilizing mechanism (11) further comprises a magnet (114) fixedly connected at equal intervals on the inner wall of the mounting cavity (111), the outer surface of the camera (4) is fixedly connected with a tab (115) at equal intervals in the inside of the connecting seat (112), and the inside of the connecting seat (112) is filled with a non-Newtonian liquid.

7. The coal mine mining area environment monitoring device according to claim 1, characterized in that: Both sides of the housing (3) are movably connected to robotic arms (7), and drive motors (10) are fixedly connected to the inside of the housing (3) on both sides corresponding to the positions of the robotic arms (7). A cavity is provided between the body (1) and the housing (3).

8. The coal mine mining area environment monitoring device according to claim 2, characterized in that: The elastic force of the spring (55) is greater than the frictional force between adjacent pipe sections (54).

9. The coal mine mining area environment monitoring device according to claim 3, characterized in that: Both the testing mechanism (5) and the cleaning mechanism (8) are made of plastic steel.

10. The coal mine mining area environment monitoring device according to claim 6, characterized in that: The magnetic attraction of the magnet (114) to the counterweight (113) is less than the weight of the counterweight (113) itself.

Citation Information

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