Gas concentration monitoring and early warning device in closed scene where power distribution cable is located

Abstract

The invention provides a gas concentration monitoring and early warning device in a closed scene where a power distribution cable is located, and relates to the field of underground pipe network monitoring, the gas concentration monitoring and early warning device comprises a handheld data collector and a wireless gas detection ball, the wireless gas detection ball comprises a first shell and a second shell, a detection module, a communication module, a control module, an alarm module and a power supply module are arranged in the first shell. The wireless gas detection ball further comprises a moving mechanism, a driving mechanism, an unfolding mechanism and a stabilizing mechanism. By arranging the driving mechanism and a plurality of moving mechanisms, when the wireless gas detection ball moves on the smooth ground, the single-output-shaft motor drives the moving wheels through the round belt, so that the moving wheels rotate to drive the wireless gas detection ball to move forwards, and when the moving wheels are blocked and cannot rotate when encountering an obstacle, the wireless gas detection ball is driven to move forwards. The single-output-shaft motor reaches the second shell and all the moving mechanisms to be turned over integrally, obstacle crossing is completed, and the obstacle crossing capacity of the wireless gas detection ball is effectively improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of underground pipeline network monitoring, and specifically relates to a gas concentration monitoring and early warning device in a closed scenario where power distribution cables are located. Background Art

[0002] Portable detection balls usually adopt gas sensors and wireless communication technologies, can monitor the gas concentration in underground pipeline networks in real time, and transmit data to a monitoring center or a mobile device. Researchers are constantly improving the sensitivity and stability of gas sensors to improve the accuracy and reliability of detection balls.

[0003] Portable detection balls are mainly applied to the inspection and leakage early warning of underground pipeline networks. By moving into the pipeline network, the detection ball can monitor the gas concentration in real time, such as natural gas, methane, etc. Once an abnormal concentration is detected, a warning signal can be sent to remind relevant personnel to take corresponding measures.

[0004] However, the situation in underground pipeline networks is often relatively complex. Ordinary detection balls are often blocked by obstacles when moving in underground pipeline networks, making it difficult to move forward, resulting in relatively low detection efficiency.

[0005] In summary, the present invention provides a gas concentration monitoring and early warning device in a closed scenario where power distribution cables are located to solve the above problems. Summary of the Invention

[0006] In order to solve the above technical problems, the present invention provides a gas concentration monitoring and early warning device in a closed scenario where power distribution cables are located, which is achieved by the following specific technical means:

[0007] A gas concentration monitoring and early warning device in a closed scenario where power distribution cables are located includes a handheld data collector and a wireless gas detection ball. The wireless gas detection ball includes a housing one and a housing two. A detection module, a communication module, a control module, an alarm module, and a power supply module are arranged inside the housing one. The wireless gas detection ball further includes a moving mechanism, a driving mechanism, an unfolding mechanism, and a stabilizing mechanism:

[0008] Limit rods are arranged on both sides of the housing one, and a limit plate is fixedly connected to the end of the limit rod away from the housing one;

[0009] There are two housing twos, which are respectively located on both sides of the housing one, and the housing one and the housing two are integrally elliptical;

[0010] The moving mechanism includes a fixed shaft one installed on the inner wall edge of the housing two away from the housing one. A connecting arm is sleeved outside the fixed shaft one. A rotating shaft one is installed through the end of the connecting arm away from the fixed shaft one. One end of the rotating shaft one is connected to a moving wheel;

[0011] The driving mechanism includes a circular belt pulley 1 installed on the surface of the rotating shaft 1 between the connecting arm and the moving wheel, and a fixed shaft 2 arranged on the inner wall of the shell 2 away from the shell 1, the surface of the fixed shaft 2 is covered with a circular belt pulley 2, the surface of the fixed shaft 2 is also covered with a gear 1, and the gear 1 is fixedly connected to the circular belt pulley 1, the driving mechanism also includes a driving shaft installed at the center of the inner wall of the shell 2 away from the shell 1, the outer side of the driving shaft is covered with a gear 2, and the gear 2 is meshed and connected with the gear 1.

[0012] Furthermore, the number of the moving mechanisms disposed on the shell 2 is multiple, and the multiple moving mechanisms are distributed in a circular array on the shell 2;

[0013] The fixed shaft 2, the circular belt pulley 2 and the gear 1 are multiple and correspond one to one with the moving mechanism arranged on the shell 2. The driving mechanism also includes a circular belt and a circular belt pulley 3 installed on both sides of the connecting arm outside the fixed shaft 1, and the spacing between the two circular belt pulleys 3 on the fixed shaft 1 is equal to the diameter of the circular belt pulley 1. The circular belt pulley 1 and the circular belt pulley 2 are connected through the circular belt transmission. The circular belt pulley 1 is located on the inner side of the circular belt, and the circular belt pulley 2 is located on the outer side of the circular belt, and the part of the round belt located between the circular belt pulley 1 and its corresponding circular belt pulley 2 passes through the outer side of the circular belt pulley 3.

[0014] Furthermore, the unfolding mechanism includes a movable ring installed between the limit plate and the shell one, and the movable ring is slidably connected to the limit rod, a rotating ring is rotatably installed on the outer side of the movable ring, a connecting rod is rotatably installed on the outer side of the rotating ring, and the end of the connecting rod away from the rotating ring is rotatably connected to the connecting arm, and the unfolding mechanism also includes a threaded rod rotatably installed between the limit plate and the shell one, the threaded rod passes through the movable ring, and the movable ring and the threaded rod are threadedly connected.

[0015] Furthermore, the stabilizing mechanism includes an arc-shaped groove opened on the surface of the shell one, and the arc-shaped groove is connected to the interior of the shell one, a rotating shaft two is installed inside the arc-shaped groove, an arc-shaped arm is also installed inside the arc-shaped groove, and the arc-shaped arm is fixedly connected to the rotating shaft two, a stabilizing wheel is installed at one end of the arc-shaped arm, and a connecting sleeve is provided at the other end of the arc-shaped arm, a pull rope is fixedly installed on the inner side of the connecting sleeve, both ends of the pull rope are connected to sliding rods, and the ends of the two sliding rods away from the pull rope respectively pass through the two sides of the shell one, and the passed ends are fixedly connected to the movable ring, and the stabilizing mechanism also includes a torsion spring mounted on the surface of the rotating shaft two, and the two ends of the torsion spring are respectively connected to the shell one and the arc-shaped arm.

[0016] Furthermore, the driving mechanism also includes a single-shaft motor fixedly mounted on the limiting plate, and an output end of the single-shaft motor is transmission-connected to the driving shaft.

[0017] Furthermore, the unfolding mechanism also includes a double-output shaft motor fixedly installed inside the shell one, and the output end of the double-output shaft motor is transmission-connected to the threaded rod.

[0018] Furthermore, the surface of the second shell is provided with an opening, and the opening and the moving mechanism are arranged alternately on the second shell.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention provides a mobile mechanism to realize the movement of the wireless gas detection ball, so as to facilitate inspection in a closed space. Even if leakage of the gas pipeline in the closed space is found, the mobile mechanism can be stored in the second shell, thereby improving the portability of the device.

[0021] 2. The present invention sets a driving mechanism and multiple moving mechanisms. When the wireless gas detection ball moves on a flat ground, the single-axis motor drives the moving wheel through a circular belt, so that the moving wheel rotates to drive the wireless gas detection ball forward. When the moving wheel is blocked and cannot rotate due to an obstacle, the single-axis motor reaches the second shell and each moving mechanism is flipped as a whole to complete the crossing of the obstacle, thereby effectively improving the obstacle-crossing ability of the wireless gas detection ball. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional schematic diagram of the wireless gas detection ball of the present invention when it is unfolded;

[0023] Figure 2 It is a three-dimensional schematic diagram of the wireless gas detection ball of the present invention when it is folded;

[0024] Figure 3 It is a three-dimensional schematic diagram of the housing 1 in the present invention;

[0025] Figure 4 It is a three-dimensional schematic diagram of the structure other than the shell of the wireless gas detection ball in the present invention;

[0026] Figure 5 It is a plan view of the second structure of the shell in the present invention;

[0027] Figure 6 The present invention Figure 4 A local enlarged schematic diagram of point A in the middle.

[0028] In the figure:

[0029] 1. Housing 1; 101. Limit rod; 102. Limit plate;

[0030] 2. Housing 2; 201. Opening;

[0031] 3. Moving mechanism; 301. Fixed shaft 1; 302. Connecting arm; 303. Rotating shaft 1; 304. Moving wheel;

[0032] 4. Driving mechanism; 401. Round belt pulley 1; 402. Fixed shaft 2; 403. Round belt pulley 2; 404. Gear 1; 405. Driving shaft; 406. Gear 2; 407. Round belt; 408. Round belt pulley 3; 409. Single-output shaft motor;

[0033] 5. Deployment mechanism; 501. Movable ring; 502. Rotating ring; 503. Link; 504. Threaded rod; 505. Double-output shaft motor;

[0034] 6. Stabilizing mechanism; 601. Arc-shaped groove; 602. Rotating shaft 2; 603. Arc-shaped arm; 604. Stabilizing wheel; 605. Connecting sleeve; 606. Pulling rope; 607. Slide bar. Detailed implementation manners

[0035] The following further describes in detail the implementation manners of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0036] The present invention provides a gas concentration monitoring and warning device in a closed scenario where power distribution cables are located, including a handheld data collector and a wireless gas detection sphere. The wireless gas detection sphere includes a housing 1 and a housing 2. A detection module, a communication module, a control module, an alarm module, and a power supply module are arranged inside the housing 1. The wireless gas detection sphere further includes a moving mechanism 3, a driving mechanism 4, a deployment mechanism 5, and a stabilizing mechanism 6:

[0037] The detection module is used to detect the concentration of combustible gases, and then find out the leakage points, including combustible gas sensors, toxic gas sensors, oxygen sensors, etc. The types of sensors can be electrochemical sensors, semiconductor sensors, or spectral sensors. The characteristics of each sensor are shown in Table 1:

[0038]

[0039] Table 1

[0040] The appropriate type of sensor can be selected according to the above table according to requirements, budget, and environmental conditions. A metal sintered head is configured outside the sensor to protect each sensor head and achieve the protection of the sensor.

[0041] The communication module adopts the LoRa 470 communication solution, with a communication distance of 200 meters and an occlusion distance of 50 meters in the tunnel. It can locate and give remote alarms, and is used to remotely send the information detected by the detection module to the handheld data collector.

[0042] The alarm module uses light-emitting diodes and micro buzzers to give remote acoustic and optical reminders when abnormal gas concentrations are detected.

[0043] The control module is used to control the operation of each module, the single-output shaft motor 409, and the double-output shaft motor 505.

[0044] The power supply module is used to supply power to the above-mentioned modules, the single-output shaft motor 409, and the double-output shaft motor 505.

[0045] The handheld data collector is developed using an ultra-low-power 4G communication gateway, which integrates the State Grid Transmission I1 protocol to ensure data security. It conducts intelligent analysis and processing on the data collected on-site and forwards it to the background. The handheld data collector is powered by a battery, with a 0.5AH battery built-in to ensure real-time visibility of the data.

[0046] Limit rods 101 are provided on both sides of the first housing 1, and a limit plate 102 is fixedly connected to the end of the limit rod 101 away from the first housing 1;

[0047] There are two second housings 2, which are respectively located on both sides of the first housing 1, and the first housing 1 and the second housing 2 are integrally oval;

[0048] The first housing 1 and the second housing 2 are made of PFEE (PTFE, polytetrafluoroethylene, Teflon), with the characteristics of light weight, good insulation performance, strong corrosion resistance, high temperature resistance of 250 °C, low temperature resistance of -196 °C, high lubrication, small dust adhesion, and easy cleaning.

[0049] The moving mechanism 3 includes a first fixed shaft 301 installed on the inner wall edge of the second housing 2 away from the first housing 1. A connecting arm 302 is sleeved on the outside of the first fixed shaft 301. A first rotating shaft 303 is installed through the end of the connecting arm 302 away from the first fixed shaft 301, and a moving wheel 304 is connected to one end of the first rotating shaft 303;

[0050] There are multiple moving mechanisms 3 provided on the second housing 2, and the multiple moving mechanisms 3 are arranged in a circular array on the second housing 2;

[0051] The unfolding mechanism 5 includes a movable ring 501 installed between the limit plate 102 and the first housing 1. The movable ring 501 is slidably connected to the limit rod 101. A rotating ring 502 is rotatably installed on the outer side of the movable ring 501. A connecting rod 503 is rotatably installed on the outer side of the rotating ring 502. One end of the connecting rod 503 far from the rotating ring 502 is rotatably connected to the connecting arm 302. The unfolding mechanism 5 further includes a threaded rod 504 rotatably installed between the limit plate 102 and the first housing 1. The threaded rod 504 penetrates through the movable ring 501, and the movable ring 501 is threadedly connected to the threaded rod 504.

[0052] The unfolding mechanism 5 further includes a double-output shaft motor 505 fixedly installed inside the first housing 1. The output end of the double-output shaft motor 505 is drivingly connected to the threaded rod 504.

[0053] An opening 201 is provided on the surface of the second housing 2. The opening 201 and the moving mechanism 3 are arranged staggeredly on the second housing 2.

[0054] As Figures 1-6 shown, when the wireless gas detection sphere unfolds the moving mechanism 3, the double-output shaft motor 505 drives the threaded rods 504 on both sides of the first housing 1 to rotate. During the rotation of the threaded rods 504, the movable ring 501 threadedly connected thereto will move away from the first housing 1 on the limit rod 101. The movable ring 501 drives the rotating ring 502 to move synchronously. During the movement of the rotating ring 502, the connecting arm 302 and the moving wheel 304 are pushed by the connecting rod 503 to unfold from the inside of the opening 201 around the fixed shaft 301 until the connecting arm 302 lifts the first housing 1 and the second housing 2 away from the inner wall of the pipeline, completing the unfolding process of the moving mechanism 3. After the detection is completed, the double-output shaft motor 505 drives the threaded rod 504 to rotate in the opposite direction, and then the connecting arm 302 and the moving wheel 304 are retracted into the second housing 2 from the opening 201.

[0055] The driving mechanism 4 includes a first pulley 401 installed between the connecting arm 302 and the moving wheel 304 on the surface of the first rotating shaft 303 and a second fixed shaft 402 provided on the inner wall of the second housing 2 far from the first housing 1. A second pulley 403 is sleeved on the surface of the second fixed shaft 402. A first gear 404 is also sleeved on the surface of the second fixed shaft 402. The first gear 404 is fixedly connected to the first pulley 401. The driving mechanism 4 further includes a driving shaft 405 installed at the center of the inner wall of the second housing 2 far from the first housing 1. A second gear 406 is sleeved on the outer side of the driving shaft 405. The second gear 406 is meshed with the first gear 404.

[0056] The fixed shaft 2 402, the circular belt pulley 2 403 and the gear 1 404 are multiple and correspond one to one with the moving mechanism 3 arranged on the shell 2 2. The driving mechanism 4 also includes a circular belt 407 and a circular belt pulley 3 408 installed on the outside of the fixed shaft 301 on both sides of the connecting arm 302, and the spacing between the two circular belt pulleys 3 408 on the fixed shaft 301 is equal to the diameter of the circular belt pulley 1 401. The circular belt pulley 1 401 and the circular belt pulley 2 403 are connected through the circular belt 407. The circular belt pulley 1 401 is located on the inner side of the circular belt 407, and the circular belt pulley 2 403 is located on the outer side of the circular belt 407. The part of the circular belt 407 located between the circular belt pulley 1 401 and its corresponding circular belt pulley 2 403 passes through the outer side of the circular belt pulley 3 408.

[0057] The driving mechanism 4 further includes a single-shaft motor 409 fixedly mounted on the limiting plate 102 , and an output end of the single-shaft motor 409 is transmission-connected to the driving shaft 405 .

[0058] like Figures 1-6 As shown, after the connecting arm 302 and the moving wheel 304 are unfolded, the single-axis motor 409 is started and drives the driving shaft 405 to rotate, the driving shaft 405 drives the gear 2 406 to rotate, the gear 2 406 drives the gear 1 404 to rotate, thereby causing each circular pulley 2 403 to rotate, the circular pulley 2 403 drives each circular pulley 1 401 to rotate through the circular belt 407, and the circular pulley 1 401 drives the rotating shaft 1 303 and the moving wheel 304 to rotate, thereby realizing the movement of the shell 1 1 and the shell 2 2.

[0059] It should be noted that there are multiple, preferably four, mobile mechanisms 3 arranged on the shell 2. When the wireless gas detection ball moves on the flat ground, there are always two mobile wheels 304 in the mobile mechanisms 3 on each shell 1 that are in contact with the ground, and the circular pulley 1 401, the circular pulley 2 403 and the mobile wheel 304 can rotate normally, thereby realizing the movement of the wireless gas detection ball. When encountering an obstacle during the movement, the mobile wheel 304 located at the front side of the moving direction is blocked by the obstacle and cannot rotate. The circular pulley 1 401 and the circular pulley 2 403 are connected by a circular belt 407 for transmission, and therefore cannot rotate either. The gear 1 404 fixedly connected to the circular pulley 2 403 also cannot rotate. At this time, the gear 1 404 and the gear 2 406 are equivalent to a fixed connection. When the single-axis motor 409 drives the drive shaft 405 to rotate, it will drive the shell 2 2 and the mobile mechanism 3 to rotate as a whole. The shell 1 is driven to cross the obstacle by the flipping of the mobile mechanism 3, thereby improving the obstacle-crossing ability of the wireless gas detection ball.

[0060] The purpose of providing the round pulley three 408 is to limit the round belt 407 through the round pulley three 408 during the process of unfolding and folding the moving mechanism 3, thereby preventing the round belt 407 from falling off the surface of the round pulley one 401 and the round pulley two 403.

[0061] The stabilizing mechanism 6 includes an arc-shaped groove 601 formed on the surface of the first housing 1, and the arc-shaped groove 601 communicates with the inside of the first housing 1. A second rotating shaft 602 is installed inside the arc-shaped groove 601. An arc-shaped arm 603 is also installed inside the arc-shaped groove 601, and the arc-shaped arm 603 is fixedly connected to the second rotating shaft 602. A stabilizing wheel 604 is installed at one end of the arc-shaped arm 603. A connecting sleeve 605 is provided at the other end of the arc-shaped arm 603. A pulling rope 606 is fixedly installed inside the connecting sleeve 605. Both ends of the pulling rope 606 are connected to a sliding rod 607. The ends of the two sliding rods 607 away from the pulling rope 606 pass through the two sides of the first housing 1 respectively, and the passed-through ends are fixedly connected to the movable ring 501. The stabilizing mechanism 6 further includes a torsion spring sleeved on the surface of the second rotating shaft 602, and both ends of the torsion spring are connected to the first housing 1 and the arc-shaped arm 603 respectively.

[0062] As Figures 1-6 shown, during the unfolding process of the moving mechanism 3, both movable rings 501 move away from the first housing 1. During the movement of the movable ring 501, the sliding rod 607 will be driven to move outside the first housing 1 at the same time. The pulling rope 606 is pulled by the sliding rod 607. The pulling rope 606 pulls the end of the arc-shaped arm 603 away from the stabilizing wheel 604 to rotate outward of the first housing 1, and further makes the end of the arc-shaped arm 603 provided with the stabilizing wheel 604 rotate away from the first housing 1, so that the stabilizing wheel 604 extends out of the arc-shaped groove 601. During this process, the rotation of the arc-shaped arm 603 will wind up the torsion spring. When the moving mechanism 3 is retracted, the sliding rod 607 moves inside the first housing 1, and at the same time the torsion spring loosens and resets the arc-shaped arm 603 and the stabilizing wheel 604;

[0063] During the operation of the single-output shaft motor 409 to drive the first housing 1 and the second housing 2 to move forward, the motor will generate a torque in the opposite direction on the second housing 2, so that the first housing 1 rotates in reverse. By providing the arc-shaped arm 603 and the stabilizing wheel 604, the stabilizing wheel 604 installed on the arc-shaped arm 603 can abut against the ground during the reverse rotation of the first housing 1, thereby stopping the reverse rotation of the first housing 1 and improving the stability of the first housing 1.

[0064] Specific working principle:

[0065] First, place the wireless gas detection sphere on the ground. Then, start the double-output shaft motor 505 to drive each moving mechanism 3 to unfold through the double-output shaft motor 505, so that the first housing 1 and the second housing 2 leave the ground. During the unfolding process of the moving mechanism 3, the movable ring 501 drives the slide rod 607 to move out of the first housing 1. The slide rod 607 pulls the arc-shaped arm 603 to unfold through the pull rope 606, so that the stabilizing wheel 604 extends out from the surface of the first housing 1 to maintain the stability of the first housing 1 during the movement of the wireless gas detection sphere. After that, the single-output shaft motor 409 can be started to drive each moving wheel 304 to rotate, so as to realize the movement of the wireless gas detection sphere. During the movement of the wireless gas detection sphere, when the detection module detects that the surrounding gas concentration is abnormal, the alarm module issues an audible and visual reminder. At the same time, the communication module sends the data to the handheld data collector to facilitate informing the staff of the location where the gas concentration is abnormal. When the gas concentration detection in the area is completed, the wireless gas detection sphere moves back to the initial position. Then, the double-output shaft motor 505 is started to retract each moving mechanism 3. Subsequently, the staff retrieves the wireless gas detection sphere.

[0066] The embodiments of the present invention are given for the purposes of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A gas concentration monitoring and early warning device in a closed scene where a distribution cable is located, comprising a handheld data collector and a wireless gas detection ball, wherein the wireless gas detection ball comprises a shell 1 (1) and a shell 2 (2), wherein a detection module, a communication module, a control module, an alarm module and a power supply module are arranged inside the shell 1 (1), characterized in that: The wireless gas detection ball further comprises a moving mechanism (3), a driving mechanism (4), an unfolding mechanism (5) and a stabilizing mechanism (6): Limiting rods (101) are provided on both sides of the housing 1 (1), and one end of the limiting rod (101) away from the housing 1 (1) is fixedly connected to a limiting plate (102); There are two shells (2) and they are located on both sides of the shell (1), and the shell (1) and the shell (2) are elliptical in shape as a whole; The moving mechanism (3) comprises a fixed shaft (301) installed on the inner wall edge of the shell (2) away from the shell (1), a connecting arm (302) is sleeved on the outer side of the fixed shaft (301), a rotating shaft (303) is installed through the end of the connecting arm (302) away from the fixed shaft (301), and one end of the rotating shaft (303) is connected to a moving wheel (304); The driving mechanism (4) comprises a circular pulley (401) installed on the surface of the rotating shaft (303) between the connecting arm (302) and the moving wheel (304) and a fixed shaft (402) arranged on the inner wall of the shell (2) away from the shell (1), the surface of the fixed shaft (402) is provided with a circular pulley (403), the surface of the fixed shaft (402) is also provided with a gear (404), and the gear (404) is fixedly connected to the circular pulley (401), and the driving mechanism (4) also comprises a driving shaft (405) installed at the center of the inner wall of the shell (2) away from the shell (1), the outer side of the driving shaft (405) is provided with a gear (406), and the gear (406) is meshed and connected with the gear (404).

2. The gas concentration monitoring and early warning device in a closed scene where the power distribution cable is located as claimed in claim 1, characterized in that: The number of the moving mechanisms (3) arranged on the second shell (2) is multiple, and the multiple moving mechanisms (3) are distributed in a circular array on the second shell (2); The fixed shaft 2 (402), the round pulley 2 (403) and the gear 1 (404) are multiple and correspond to the moving mechanism (3) arranged on the housing 2 (2). The driving mechanism (4) also includes a round belt (407) and a round pulley 3 (408) installed on both sides of the connecting arm (302) outside the fixed shaft 1 (301), and the spacing between the two round pulleys 3 (408) on the fixed shaft 1 (301) is equal to the spacing of the round pulley 1 (401). The circular belt pulley 1 (401) and the circular belt pulley 2 (403) are connected to each other through the circular belt (407), the circular belt pulley 1 (401) is located on the inner side of the circular belt (407), the circular belt pulley 2 (403) is located on the outer side of the circular belt (407), and the portion of the circular belt (407) located between the circular belt pulley 1 (401) and the corresponding circular belt pulley 2 (403) passes from the outer side of the circular belt pulley 3 (408).

3. The gas concentration monitoring and early warning device in a closed scene where the power distribution cable is located as claimed in claim 1, characterized in that: The unfolding mechanism (5) comprises a movable ring (501) installed between the limiting plate (102) and the shell one (1), and the movable ring (501) is slidably connected to the limiting rod (101), a rotating ring (502) is rotatably installed on the outer side of the movable ring (501), a connecting rod (503) is rotatably installed on the outer side of the rotating ring (502), and one end of the connecting rod (503) away from the rotating ring (502) is rotatably connected to the connecting arm (302), and the unfolding mechanism (5) also comprises a threaded rod (504) rotatably installed between the limiting plate (102) and the shell one (1), the threaded rod (504) passes through the movable ring (501), and the movable ring (501) and the threaded rod (504) are threadedly connected.

4. The gas concentration monitoring and early warning device in a closed scene where the power distribution cable is located as claimed in claim 3, characterized in that: The stabilizing mechanism (6) comprises an arc-shaped groove (601) provided on the surface of the shell one (1), and the arc-shaped groove (601) is communicated with the interior of the shell one (1), a second rotating shaft (602) is installed inside the arc-shaped groove (601), an arc-shaped arm (603) is also installed inside the arc-shaped groove (601), and the arc-shaped arm (603) is fixedly connected to the second rotating shaft (602), a stabilizing wheel (604) is installed at one end of the arc-shaped arm (603), and a connecting sleeve is provided at the other end of the arc-shaped arm (603). (605), a pull rope (606) is fixedly installed on the inner side of the connecting sleeve (605), and both ends of the pull rope (606) are connected to sliding rods (607), and the ends of the two sliding rods (607) away from the pull rope (606) are respectively passed through the two sides of the shell one (1), and the passed ends are fixedly connected to the movable ring (501), and the stabilizing mechanism (6) also includes a torsion spring sleeved on the surface of the rotating shaft two (602), and the two ends of the torsion spring are respectively connected to the shell one (1) and the arc arm (603).

5. The gas concentration monitoring and early warning device in a closed scene where the distribution cable is located as claimed in claim 1, characterized in that: The driving mechanism (4) further comprises a single-shaft motor (409) fixedly mounted on the limiting plate (102), and an output end of the single-shaft motor (409) is transmission-connected to the driving shaft (405).

6. The gas concentration monitoring and early warning device in a closed scene where the power distribution cable is located as claimed in claim 3, characterized in that: The unfolding mechanism (5) further comprises a double-output shaft motor (505) fixedly mounted inside the housing (1), and the output end of the double-output shaft motor (505) is transmission-connected to the threaded rod (504).

7. The gas concentration monitoring and early warning device in a closed scene where the distribution cable is located as claimed in claim 1, characterized in that: The surface of the second shell (2) is provided with an opening (201), and the opening (201) and the moving mechanism (3) are arranged alternately on the second shell (2).

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