Gas detection device with protection structure for coal mine fire prevention

Abstract

The invention discloses a coal mine fireproof gas detection device with a protection structure, and relates to the technical field of gas detection devices, the coal mine fireproof gas detection device comprises a machine body, a first shell, a first protection plate and a second shell, and the machine body is internally provided with a gas detection probe. According to the coal mine fireproof gas detection device with the protection structure, a bevel gear set is driven by a starting motor to rotate, the bevel gear set drives an exhaust fan to rotate through a connecting column, external air is fed into a machine body, and meanwhile, a round rod on one side of the exhaust fan drives a gear set to rotate through a first belt wheel set; the gear set can drive the connecting rod to rotate, the connecting rod can make contact with a sliding groove in the cleaning brush when rotating, the cleaning brush is driven to swing in a reciprocating mode, and the cleaning brush can clean dust and impurities deposited on the filter screen, so that through the operation, the filter screen can be cleaned while air enters the machine body; dust in the air is prevented from blocking the filter screen.

Description

Technical Field

[0001] The invention relates to the technical field of gas detection devices, in particular to a gas detection device with a protective structure for coal mine fire prevention. Background Art

[0002] Gas is a colorless, tasteless and odorless gas. When it reaches a certain concentration, it can cause people to suffocate due to lack of oxygen, and can cause combustion or explosion. Gas exists in the coal body or surrounding rock in a free state and a sorbed state. When mining coal, it is necessary to use a gas detection device to detect the mine to prevent the gas content in the mine from exceeding the standard, causing fire and explosion in the coal mine, and causing safety accidents. Doing a good job in gas monitoring is of great significance to the safe production and long-term development of coal enterprises.

[0003] When working in a coal mine, it is necessary to use a gas detection device to detect the gas content in the coal mine to prevent the gas content from exceeding the standard, causing fire and explosion, and causing safety accidents. The existing gas detection device will introduce gas into the detection device during detection. In order to prevent impurities in the air from entering the interior of the detection device, a filter will be installed. After long-term use, the filter will be clogged with dust, affecting the filtering effect. The existing gas detection device needs to be cleaned manually with a brush, or a motor is started to drive the cleaning brush to move on the filter to clean it. However, these cleaning methods are only cleaned after the filter is found to be clogged, which has a delay and will affect the detection effect of the gas detection device. Summary of the invention

[0004] The object of the present invention is to provide a gas detection device with a protective structure for coal mine fire prevention, so as to solve the problem that the filter net of the existing gas detection device is prone to clogging, thus affecting the detection effect.

[0005] To achieve the above object, the present invention provides the following technical solution: A gas detection device with a protective structure for coal mine fire prevention, comprising a body, a first shell, a first protective plate and a second shell, a gas detection probe is installed inside the body, and an output end of the gas detection probe is connected to an alarm through a wire;

[0006] One side of the first shell is fixed to the machine body, a motor is installed inside the first shell, an output end of the motor is fixedly connected to a first bevel gear, an outer side of the first bevel gear is meshingly connected to a second bevel gear, a connecting column is fixedly connected inside the second bevel gear, and one end of the connecting column is movably connected to the first shell through a bearing.

[0007] Preferably, one end of the connecting column is fixedly connected to an exhaust fan, one side of the exhaust fan is fixedly connected to a first pulley group via a round rod, one side of the first pulley group is fixedly connected to a small gear via a round rod, and the outer side of the small gear is meshingly connected to a large gear.

[0008] Preferably, one side of the large gear is fixedly connected to a connecting rod, one side of the connecting rod is connected to a cleaning brush, and one side of the cleaning brush is movably connected to the machine body through a rotating shaft.

[0009] Preferably, one side of the small gear and the large gear is movably connected with a connecting plate through a rotating shaft, the bottom of the connecting plate is fixed to the first shell, and a filter screen is provided on one side of the cleaning brush, and the outer side of the filter screen is connected to the machine body.

[0010] Preferably, one side of the first protective plate is connected to the body through a slider, one side of the first protective plate is movably connected to a connecting rod through a rotating shaft, one side of the connecting rod is movably connected to the body through a rotating shaft and a slider, and one side of the connecting rod is fixedly connected to a first rack rod.

[0011] Preferably, one side of the first rack rod is meshedly connected with a gear body, the interior of the gear body is movably connected to the machine body through a round rod, the outer side of the gear body is meshedly connected with a second rack rod, the top of the second rack rod is fixedly connected to a lifting platform, and one side of the second rack rod is connected to the machine body through a slider.

[0012] Preferably, the top of the lifting platform is connected to the gas detection probe and the alarm, one side of the first protective plate is meshed with a driving gear through a rack, the outer side of the driving gear is meshed with a first driven gear, and the inside of the first driven gear is fixedly connected to a second pulley group through a round rod.

[0013] Preferably, one side of the second pulley group is fixedly connected to the second driven gear via a round rod, the interiors of the driving gear, the first driven gear and the second driven gear are movably connected to the machine body via a rotating shaft, the outer side of the second driven gear is meshingly connected to the second protective plate, and one side of the second protective plate is connected to the machine body via a slider.

[0014] Preferably, one side of the second shell is fixed to the body, the inside of the second shell is movably connected with a connecting shaft through a bearing, a pull rope is sleeved on the outer side of the connecting shaft, the outer side of the pull rope passes through a connecting limit block, one side of the limit block is fixed to the body, the outer side of the pull rope is connected to a pulley, and one side of the pulley is connected to the body.

[0015] Preferably, one end of the pull rope is fixedly connected to a searchlight, and connecting blocks are movably connected to both sides of the searchlight via a rotating shaft, one side of the connecting block is fixed to the body, a worm gear is fixedly connected to the outer side of the connecting shaft, a worm is meshingly connected to the outer side of the worm gear, one side of the worm is movably connected to the second shell via a bearing, a fixing block is fixedly connected to a side of the body close to the searchlight, an elastic rope is fixedly connected to one side of the fixing block, and one end of the elastic rope is fixedly connected to the searchlight.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: the starting motor drives the bevel gear group to rotate, and the bevel gear group drives the exhaust fan to rotate through the connecting column to send external air into the machine body. At the same time, the round rod on one side of the exhaust fan drives the gear group to rotate through the first pulley group, and the gear group drives the connecting rod to rotate. When the connecting rod rotates, it will contact the slide groove inside the cleaning brush, driving the cleaning brush to swing back and forth, and the cleaning brush will clean the dust and impurities deposited on the filter net. In this way, through the above operation, the filter net can be cleaned at the same time as the air enters the machine body, thereby preventing dust in the air from clogging the filter net and affecting the detection effect of the gas detection device.

[0017] 1. When working in a coal mine, it is necessary to use a gas detection device to detect the gas content in the coal mine to prevent the gas content from exceeding the standard, causing fire and explosion, and causing safety accidents. When the gas detection device is working, in order to allow external air to quickly enter the machine body for detection, the bevel gear set is driven to rotate by the starting motor, and the bevel gear set will drive the exhaust fan to rotate through the connecting column to send external air into the machine body. At the same time, the round rod on one side of the exhaust fan will drive the gear set to rotate through the first pulley set, and the gear set will drive the connecting rod to rotate. When the connecting rod rotates, it will contact the slide groove inside the cleaning brush, driving the cleaning brush to swing back and forth, and the cleaning brush will clean the dust and impurities deposited on the filter. In this way, through the above operation, the filter can be cleaned at the same time as the air enters the machine body to prevent dust in the air from clogging the filter and affecting the detection effect of the gas detection device.

[0018] 2. When working in a coal mine pit, it is necessary to use a gas detection device to detect the gas content in the coal mine to prevent the gas content from exceeding the standard, causing fire and explosion, and causing safety accidents. By pulling the first protective plate to drive the active gear to rotate, the active gear will drive the second driven gear to rotate through the first driven gear and the second pulley group. The second driven gear and the active gear will respectively drive the second protective plate and the first protective plate to move in relative directions so that the two are opened. When the two are opened, the connecting rod will be driven to rotate. When the connecting rod rotates, it will move inside the body through the slider, driving the first rack bar to move downward. When the first rack bar moves downward, it will mesh with the gear body and drive the gear body to rotate. When the gear body rotates, it will drive the second rack bar to move upward. When the second rack bar moves, it will drive the lifting platform to move, driving the gas detection probe and the alarm on the top to move upward. In this way, the gas detection probe and the alarm inside the gas detection device can be protected through the above operation, and the gas detection probe and the alarm can also be quickly taken out for maintenance.

[0019] 3. When working in a coal mine, it is necessary to use a gas detection device to detect the gas content in the coal mine to prevent the gas content from exceeding the standard, causing fire and explosion, and causing safety accidents. When pushing the gas detection device to move in the mine, due to the poor light in the mine, in order to facilitate observation of the road ahead, by rotating the worm, the worm will mesh with the worm wheel when it rotates, driving the worm wheel to rotate, and the worm wheel will drive the connecting shaft to rotate. When the connecting shaft rotates, the pull rope will be reeled in, and the pull rope will move through the pulley, pulling the searchlight to rotate, and the searchlight will pull the elastic rope to stretch when it rotates. At this time, the illumination direction of the searchlight will rotate. When the worm is rotated again to drive the pull rope to relax, the elastic rope will reset, pulling the searchlight to rotate, and the illumination direction of the searchlight will continue to be adjusted to facilitate seeing the road ahead and prevent the gas detection device from contacting the potholes when moving, causing the gas detection device to bump up and down, causing damage to the gas detection probe and alarm inside the gas detection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of a front cross-section of the present invention;

[0021] Figure 2 It is a right side cross-sectional schematic diagram of the present invention;

[0022] Figure 3 It is a left side cross-sectional schematic diagram of the present invention;

[0023] Figure 4 It is a top cross-sectional schematic diagram of the present invention;

[0024] Figure 5It is a schematic diagram of a front cross-section of a first housing of the present invention;

[0025] Figure 6 It is a top view schematic diagram of the second pulley assembly of the present invention;

[0026] Figure 7 It is an enlarged schematic diagram of A of the present invention.

[0027] In the figure: 1, body; 2, gas detection probe; 3, alarm; 4, first shell; 5, motor; 6, first bevel gear; 7, second bevel gear; 8, exhaust fan; 9, first pulley group; 10, small gear; 11, large gear; 12, connecting rod; 13, cleaning brush; 14, filter; 15, connecting column; 16, connecting plate; 17, first protective plate; 18, connecting rod; 19, first rack rod; 20, gear body; 21, second rack rod; 22, lifting platform; 23, driving gear; 24, first driven gear; 25, second pulley group; 26, second driven gear; 27, second protective plate; 28, second shell; 29, connecting shaft; 30, pull rope; 31, limit block; 32, pulley; 33, searchlight; 34, connecting block; 35, worm wheel; 36, worm; 37, fixing block; 38, elastic rope. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] See also Figure 1 , Figure 2 and Figure 5 The present invention provides a technical solution: a gas detection device with a protective structure for coal mine fire prevention, comprising a body 1, a first shell 4, a first protective plate 17 and a second shell 28, a gas detection probe 2 is installed inside the body 1, and an output end of the gas detection probe 2 is connected to an alarm 3 through a wire;

[0030] One side of the first shell 4 is fixed to the machine body 1, and a motor 5 is installed inside the first shell 4. The output end of the motor 5 is fixedly connected to the first bevel gear 6, and the outer side of the first bevel gear 6 is meshed with the second bevel gear 7. The second bevel gear 7 is fixedly connected to a connecting column 15 inside, and one end of the connecting column 15 is movably connected to the first shell 4 through a bearing; one end of the connecting column 15 is fixedly connected to an exhaust fan 8, and one side of the exhaust fan 8 is fixedly connected to a first pulley set 9 through a round rod, and one side of the first pulley set 9 is fixedly connected to a small gear 10 through a round rod, and the outer side of the small gear 10 is meshed with a large gear 11; one side of the large gear 11 is fixedly connected to a connecting rod 12, and the connecting rod 12 is fixedly connected to the large gear 11. A cleaning brush 13 is connected to one side of the connecting rod 12, and one side of the cleaning brush 13 is movably connected to the body 1 through a rotating shaft; a connecting plate 16 is movably connected to one side of the pinion 10 and the large gear 11 through a rotating shaft, and the bottom of the connecting plate 16 is fixed to the first shell 4, a filter screen 14 is provided on one side of the cleaning brush 13, and the outer side of the filter screen 14 is connected to the body 1, a fixed block 37 is fixedly connected to one side of the body 1 close to the searchlight 33, and an elastic rope 38 is fixedly connected to one side of the fixed block 37, and one end of the elastic rope 38 is fixedly connected to the searchlight 33, the pinion 10 and the large gear 11 constitute a meshing transmission structure, and the cleaning brush 13 constitutes a rotating structure with the body 1 through the rotating shaft.

[0031] During specific implementation, when working in a coal mine, it is necessary to use a gas detection device to detect the gas content in the coal mine to prevent the gas content from exceeding the standard, causing fire and explosion, and causing safety accidents. When the gas detection device is working, in order to allow external air to quickly enter the body 1 for detection, by starting the motor 5, the motor 5 will drive the first bevel gear 6 to rotate, the first bevel gear 6 will mesh with the second bevel gear 7, and drive the second bevel gear 7 to rotate. The second bevel gear 7 will drive the exhaust fan 8 to rotate through the connecting column 15 to send external air into the body 1. When the air passes through the filter 14, the dust it carries will be filtered out and left on the filter 14. At the same time, the round rod on one side of the exhaust fan 8 will drive the first pulley group 9 to rotate, and the first pulley group 9 will drive the small When the gear 10 rotates, the small gear 10 will mesh with the large gear 11, driving the large gear 11 to rotate, and the large gear 11 will drive the connecting rod 12 to rotate. When the connecting rod 12 rotates, it will contact the slide groove inside the cleaning brush 13, driving the cleaning brush 13 to rotate. The continuous rotation of the connecting rod 12 will drive the cleaning brush 13 to swing back and forth, and the cleaning brush 13 will clean the dust and impurities deposited on the filter 14 to prevent the dust from clogging the filter 14. The small gear 10 will slow down the large gear 11, so the swinging speed of the cleaning brush 13 will be slowed down, reducing the loss of the cleaning brush 13. In this way, through the above operation, the filter 14 can be cleaned while the air enters the body 1 to prevent the dust in the air from clogging the filter 14 and affecting the detection effect of the gas detection device.

[0032] See also Figure 1 , Figure 3 , Figure 4 and Figure 6 One side of the first protective plate 17 is connected to the machine body 1 through a slider, one side of the first protective plate 17 is movably connected to a connecting rod 18 through a rotating shaft, one side of the connecting rod 18 is movably connected to the machine body 1 through a rotating shaft and a slider, and one side of the connecting rod 18 is fixedly connected to a first rack rod 19; one side of the first rack rod 19 is meshedly connected to a gear body 20, the inside of the gear body 20 is movably connected to the machine body 1 through a round rod, and the outer side of the gear body 20 is meshedly connected to a second rack rod 21, and the top of the second rack rod 21 is fixedly connected to a lifting platform 22, and one side of the second rack rod 21 is connected to the machine body 1 through a slider; the top of the lifting platform 22 is connected to the gas detection probe 2 and the alarm 3, and the first protective plate 17 A driving gear 23 is meshed with a rack on one side, a first driven gear 24 is meshed with the outer side of the driving gear 23, and a second pulley set 25 is fixedly connected to the inside of the first driven gear 24 through a round rod; a second driven gear 26 is fixedly connected to one side of the second pulley set 25 through a round rod, and the insides of the driving gear 23, the first driven gear 24 and the second driven gear 26 are all movably connected to the body 1 through a rotating shaft, a second protective plate 27 is meshed with the outer side of the second driven gear 26, and one side of the second protective plate 27 is connected to the body 1 through a slider, the connecting rod 18 forms a sliding structure with the body 1 through the slider, and the connecting rod 18 forms a rotating structure with the first protective plate 17 through the rotating shaft.

[0033] During specific implementation, when working in a coal mine, it is necessary to use a gas detection device to detect the gas content in the coal mine to prevent the gas content from exceeding the standard, causing fire and explosion, and causing safety accidents. When conducting detection in the coal mine, in order to prevent the gas detection probe 2 from being exposed to the outside and damaged, it is necessary to store it in the body 1 to protect it. When the gas detection probe 2 needs to be inspected and maintained, the first protective plate 17 is pulled to move. When the first protective plate 17 moves, it will drive the driving gear 23 to rotate through the rack on one side. When the driving gear 23 rotates, it will mesh with the first driven gear 24, driving the first driven gear 24 to rotate in the opposite direction. When the first driven gear 24 rotates, it will drive the second pulley group 25 to rotate, and the second pulley group 25 will drive the second driven gear 26 to rotate. The direction of rotation of the second driven gear 26 is also opposite to that of the driving gear 23. Therefore, the second driven gear 26 and the driving gear 23 will respectively drive the second protective plate 27 and the first driven gear 23 to rotate. When the first rack bar 19 moves downward, it meshes with the gear body 20, driving the gear body 20 to rotate. When the gear body 20 rotates, it drives the second rack bar 21 to move upward. When the second rack bar 21 moves, it drives the lifting platform 22 to move, driving the gas detection probe 2 and the alarm 3 on the top thereof to move upward. As the second protective plate 27 and the first protective plate 17 are continuously unfolded, the gas detection probe 2 and the alarm 3 will also be gradually pushed out of the body 1. The wide external space can facilitate the rapid inspection and maintenance of the gas detection probe 2 and the alarm 3. In this way, the gas detection probe 2 and the alarm 3 inside the gas detection device can be protected through the above operation, and the gas detection probe 2 and the alarm 3 can also be quickly taken out for inspection.

[0034] See also Figure 1 , Figure 4 , Figure 6 and Figure 7One side of the second shell 28 is fixed to the machine body 1, and a connecting shaft 29 is movably connected to the inside of the second shell 28 through a bearing. A pull rope 30 is sleeved on the outer side of the connecting shaft 29, and the outer side of the pull rope 30 passes through and connects to a limit block 31. One side of the limit block 31 is fixed to the machine body 1, and a pulley 32 is connected to the outer side of the pull rope 30, and one side of the pulley 32 is connected to the machine body 1; one end of the pull rope 30 is fixedly connected to a searchlight 33, and both sides of the searchlight 33 are movably connected to connecting blocks 34 through a rotating shaft, and one side of the connecting block 34 is fixed to the machine body 1, and a worm wheel 35 is fixedly connected to the outer side of the connecting shaft 29, and a worm 36 is meshingly connected to the outer side of the worm wheel 35, and one side of the worm 36 is movably connected to the second shell 28 through a bearing, and the worm wheel 35 and the worm 36 form a meshing transmission structure, and the searchlight 33 forms a rotating structure with the connecting block 34 through the rotating shaft.

[0035] In specific implementation, when working in a coal mine, it is necessary to use a gas detection device to detect the gas content in the coal mine to prevent the gas content from exceeding the standard, causing fire and explosion, and causing safety accidents. When pushing the gas detection device to move in the mine, due to the poor light in the mine, in order to facilitate observation of the road ahead, by rotating the worm 36, the worm 36 will mesh with the worm wheel 35 when it rotates, driving the worm wheel 35 to rotate, and the worm wheel 35 will drive the connecting shaft 29 to rotate when the connecting shaft 29 rotates. The pull rope 30 will be reeled in when the connecting shaft 29 rotates, and the pull rope 30 will move through the pulley 32 to pull the searchlight 33 to rotate. When the searchlight 33 rotates, the elastic rope 38 will be stretched. At this time, the irradiation direction of the searchlight 33 will be When the worm 36 is rotated again to drive the pull rope 30 to loosen, the elastic rope 38 will be reset, and the searchlight 33 will be pulled to rotate, and the irradiation direction of the searchlight 33 will continue to be adjusted. After the adjustment is completed, the worm 36 is released. Due to the characteristics of the connection between the worm wheel 35 and the worm 36, the worm wheel 35 cannot drive the worm 36 to rotate. When the worm 36 does not rotate, the position of the worm wheel 35 will be fixed, so the irradiation angle of the searchlight 33 will also be fixed. In this way, the irradiation angle of the gas detection device can be adjusted through the above operation, which is convenient for seeing the road ahead and preventing the gas detection device from contacting the potholes when moving, causing the gas detection device to bump up and down, causing damage to the gas detection probe 2 and the alarm 3 inside the gas detection device. Fixed block 37, elastic rope 38.

[0036] To sum up, the machine body 1 is sent into the coal mine, and the exhaust fan 8 is started to allow the air in the mine to quickly enter the machine body 1. The gas is detected by the gas detection probe 2. When the gas content in the gas is too high, the gas detection probe 2 will send a signal to the alarm 3, and the alarm 3 will sound an alarm to warn the staff. The contents not described in detail in this description belong to the existing technology known to professional and technical personnel in this field.

[0037] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A gas detection device with a protective structure for coal mine fire prevention, comprising a body (1), a first shell (4), a first protective plate (17) and a second shell (28), characterized in that: A gas detection probe (2) is installed inside the machine body (1), and an output end of the gas detection probe (2) is connected to an alarm (3) via an electric wire; One side of the first housing (4) is fixed to the machine body (1); a motor (5) is installed inside the first housing (4); an output end of the motor (5) is fixedly connected to a first bevel gear (6); an outer side of the first bevel gear (6) is meshingly connected to a second bevel gear (7); a connecting column (15) is fixedly connected inside the second bevel gear (7); one end of the connecting column (15) is movably connected to the first housing (4) via a bearing.

2. A gas detection device with a protective structure for coal mine fire prevention according to claim 1, characterized in that: One end of the connecting column (15) is fixedly connected to an exhaust fan (8), one side of the exhaust fan (8) is fixedly connected to a first belt pulley group (9) via a round rod, one side of the first belt pulley group (9) is fixedly connected to a small gear (10) via a round rod, and the outer side of the small gear (10) is meshingly connected to a large gear (11).

3. A gas detection device with a protective structure for coal mine fire prevention according to claim 2, characterized in that: One side of the large gear (11) is fixedly connected to a connecting rod (12), one side of the connecting rod (12) is connected to a cleaning brush (13), and one side of the cleaning brush (13) is movably connected to the machine body (1) via a rotating shaft.

4. A gas detection device with a protective structure for coal mine fire prevention according to claim 3, characterized in that: A connecting plate (16) is movably connected to one side of the small gear (10) and the large gear (11) via a rotating shaft, and the bottom of the connecting plate (16) is fixed to the first housing (4). A filter screen (14) is provided on one side of the cleaning brush (13), and the outer side of the filter screen (14) is connected to the machine body (1).

5. A gas detection device with a protective structure for coal mine fire prevention according to claim 1, characterized in that: One side of the first protective plate (17) is connected to the machine body (1) via a slider, one side of the first protective plate (17) is movably connected to a connecting rod (18) via a rotating shaft, one side of the connecting rod (18) is movably connected to the machine body (1) via a rotating shaft and a slider, and one side of the connecting rod (18) is fixedly connected to a first rack rod (19).

6. A gas detection device with a protective structure for coal mine fire prevention according to claim 5, characterized in that: One side of the first rack rod (19) is meshedly connected with a gear body (20); the interior of the gear body (20) is movably connected to the machine body (1) via a round rod; the outer side of the gear body (20) is meshedly connected with a second rack rod (21); the top of the second rack rod (21) is fixedly connected with a lifting platform (22); and one side of the second rack rod (21) is connected to the machine body (1) via a slider.

7. A gas detection device with a protective structure for coal mine fire prevention according to claim 6, characterized in that: The top of the lifting platform (22) is connected to the gas detection probe (2) and the alarm (3); one side of the first protective plate (17) is meshedly connected to a driving gear (23) via a rack; the outer side of the driving gear (23) is meshedly connected to a first driven gear (24); the interior of the first driven gear (24) is fixedly connected to a second pulley group (25) via a round rod.

8. A gas detection device with a protective structure for coal mine fire prevention according to claim 7, characterized in that: One side of the second pulley group (25) is fixedly connected to a second driven gear (26) via a round rod; the interiors of the driving gear (23), the first driven gear (24) and the second driven gear (26) are movably connected to the machine body (1) via a rotating shaft; the outer side of the second driven gear (26) is meshingly connected to a second protective plate (27); one side of the second protective plate (27) is connected to the machine body (1) via a sliding block.

9. A gas detection device with a protective structure for coal mine fire prevention according to claim 1, characterized in that: One side of the second shell (28) is fixed to the machine body (1); the interior of the second shell (28) is movably connected to a connecting shaft (29) via a bearing; a pull rope (30) is sleeved on the outside of the connecting shaft (29); a limit block (31) is passed through the outside of the pull rope (30); one side of the limit block (31) is fixed to the machine body (1); the outside of the pull rope (30) is connected to a pulley (32); one side of the pulley (32) is connected to the machine body (1).

10. A gas detection device with a protective structure for coal mine fire prevention according to claim 9, characterized in that: One end of the pull rope (30) is fixedly connected to a searchlight (33), and both sides of the searchlight (33) are movably connected to connecting blocks (34) via rotating shafts, one side of the connecting block (34) is fixed to the body (1), the outer side of the connecting shaft (29) is fixedly connected to a worm gear (35), the outer side of the worm gear (35) is meshingly connected to a worm (36), one side of the worm gear (36) is movably connected to the second housing (28) via a bearing, and a fixing block (37) is fixedly connected to the side of the body (1) close to the searchlight (33), and one side of the fixing block (37) is fixedly connected to an elastic rope (38), and one end of the elastic rope (38) is fixedly connected to the searchlight (33).

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