Mine dust concentration detection equipment

Abstract

The invention relates to the technical field of dust concentration detection, and discloses mine dust concentration detection equipment which comprises a detection cylinder, a detection device is arranged on the inner wall of the detection cylinder, a ventilation device is arranged in the detection cylinder, and the ventilation device is connected with a driving device through a first transmission shaft and a second transmission shaft. The driving device is located on the outer wall of the detection cylinder, a first gear is arranged on the outer wall of a first transmission shaft, a fourth gear is arranged on the outer wall of a second transmission shaft, sealing devices are connected to the two sides of the detection cylinder through first connecting rods, and dust removal blocks are fixedly connected to the upper ends and the lower ends of the inner sides of the sealing devices through second connecting rods. And the dust removal block is made of a sponge material. The rotating force can be transmitted to the rack through the first gear and the fourth gear, so that the problem that the detection precision is reduced due to the fact that some dust particles are attached to the surface of a sensor in traditional dust concentration detection equipment and the sensor is shielded is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of dust concentration detection, and in particular to a mine dust concentration detection device. Background Art

[0002] Dust pollution is a prominent problem during the stone mining process. First, during the feeding phase, large-scale loading equipment continuously transports the mined stone to the processing area. This stone undergoes blasting and excavation during mining, leaving a large amount of fine particles attached to its surface. When the loader dumps the stone, the violent collisions between the stones and the impact of the dumping force cause a large amount of dust to be dislodged from the surface, instantly forming a dusty "cloud" around the feed port. Entering the crushing stage, various crushers operate at high speed. For example, a cone crusher's crushing walls rotate and oscillate around the mortar wall, squeezing, bending, and grinding the stone. This process not only crushes the stone but also grinds it into countless fine dust particles due to the intense friction with the crusher's internal components. This dust, carried by the high-speed airflow within the crusher, constantly attempts to break through the equipment's gaps and dissipate into the external environment. A vibrating screen uses high-frequency vibration to classify the crushed stone. The stone bounces and tumbles on the screen, and the friction between the screen and itself releases large amounts of dust. Because the feeding, crushing, and screening processes all take place outdoors, with virtually no effective containment measures, the dust is dispersed by the wind, instantly enveloping the surrounding environment and rendering the air murky. For nearby residents, daily life is completely disrupted. Laundry hung out to dry is instantly covered in dust, and even closed doors and windows at home offer little protection against the intrusion of dust. Dust accumulates on roads, reducing friction between tires and the road, making vehicles prone to slipping and seriously impacting traffic safety. Worse still, testing has revealed that most of this dust is under 10μm in size, making it considered inhalable particulate matter. Prolonged exposure to this environment can cause workers to inhale dust that penetrates deep into their alveoli. Because its particle size is too small to be expelled, it gradually settles in the lungs, leading to pulmonary fibrosis, severe damage to lung function, and the development of serious illnesses such as pneumoconiosis, posing a direct threat to workers' health.

[0003] Most traditional dust concentration detection equipment needs to work for a long time, which causes some dust particles to adhere to the sensor surface of the detection equipment, causing the sensor to be blocked, thereby resulting in a decrease in detection accuracy. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, the present invention provides a mine dust concentration detection device, which solves the problem that most traditional dust concentration detection equipment requires a long time to work, resulting in some dust particles adhering to the sensor surface of the detection equipment, causing the sensor to be blocked, thereby resulting in a decrease in detection accuracy.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: A mine dust concentration detection device includes a detection cylinder, the inner wall of the detection cylinder is provided with a detection device, the interior of the detection cylinder is provided with a ventilation device, the ventilation device is connected to a driving device through a first transmission shaft and a second transmission shaft, the driving device is located on the outer wall of the detection cylinder, the outer wall of the first transmission shaft is provided with a first gear, and the outer wall of the second transmission shaft is provided with a fourth gear, both sides of the detection cylinder are connected with a closing device through a first connecting rod, the upper and lower ends of the inner side of the closing device are fixedly connected with a dust removal block through a second connecting rod, the dust removal block is made of sponge material, the outer wall of the dust removal block is arc-shaped, the closing device is connected to the first gear and the fourth gear through a transmission device, the outside of the detection cylinder is provided with a protective device, the outer wall of the protective device is provided with a control panel, the interior of the protective device is provided with a PLC controller, and the detection device and the driving device are electrically connected to the control panel through the PLC controller.

[0006] Preferably, the detection device includes a parallel beam lamp and a photomultiplier, the parallel beam lamp is provided on the upper inner wall of the detection cylinder, a second groove is provided on the lower inner wall of the detection cylinder, the parallel beam lamp is located inside the first groove, and the photomultiplier is located inside the second groove.

[0007] Preferably, the ventilation device includes a first rotating plate and a second rotating plate, the middle part of the first rotating plate is fixedly connected to the outer wall of the first transmission shaft, the middle part of the second rotating plate is fixedly connected to the outer wall of the second transmission shaft, the two fourth gears are located on the front and rear sides of the second rotating plate, and the two first gears are located on the front and rear sides of the first rotating plate.

[0008] Preferably, the driving device includes a motor, the outer wall of the motor is fixedly connected to the inner wall of the equipment box, the side wall of the equipment box is fixedly connected to the side wall of the detection cylinder, the output end of the motor is fixedly provided at the end of the first transmission shaft, a second gear is fixedly provided on the outer wall of the first transmission shaft close to the motor, a third gear is fixedly provided on the outer wall of the second transmission shaft close to the equipment box, the third gear is connected to the second gear through a transmission belt, a second mounting hole is provided on the side of the detection cylinder close to the equipment box, the first transmission shaft and the second transmission shaft pass through the outer wall of the detection cylinder through the second mounting hole, and the first transmission shaft and the second transmission shaft are rotatably connected to the inner wall of the detection cylinder at one end away from the equipment box.

[0009] Preferably, the sealing device comprises a sealing disk, and the sealing disk is located on both sides of the detection cylinder.

[0010] Preferably, the transmission device comprises a rack, an end of which is fixedly connected to a side of the sealing disk close to the detection cylinder, and a tooth end of the rack is meshed with tooth ends of the first gear and the fourth gear.

[0011] Preferably, the protection device includes a fixing seat, a mounting groove is provided inside the fixing seat, the detection cylinder is located inside the mounting groove, a sealing cover is provided on the upper part of the mounting groove, and a handle is provided on the top of the sealing cover.

[0012] Preferably, a stabilizing seat is provided inside the installation groove, and the top of the stabilizing seat is arc-shaped.

[0013] Preferably, the bottom of the detection cylinder is fixedly connected to the output end of the electric push rod, and the side of the electric push rod away from the output end is fixedly connected to the inner bottom of the installation groove.

[0014] Preferably, a slider is fixedly connected to one end of the first connecting rod away from the sealing disk, the slider is slidably connected to the inner wall of the slide groove, the slide groove is connected to the first mounting hole, and the diameter of the slider and the slide groove is larger than the diameter of the first mounting hole.

[0015] Working principle: Open the sealing cover through the handle and then the electric push rod pushes the detection cylinder to rise, and then sends instructions to the PLC controller through the control panel, and then the PLC controller controls the motor to output rotational force, thereby driving the first transmission shaft to rotate, and the second gear on the outer wall of the first transmission shaft drives the transmission belt to rotate, and then drives the third gear to rotate, and uses the third gear to drive the second transmission shaft to rotate, thereby the second rotating plate and the first rotating plate start to rotate, and at the same time, the fourth gear on the outer wall of the second transmission shaft and the first gear on the outer wall of the first transmission shaft drive the rack to move outward, thereby pushing the sealing disk away from the detection cylinder. The first rotating plate and the second rotating plate rotate to allow air to circulate from the inside of the detection tube. When air passes through the parallel beam lamp, the parallel light and the field of view of the light receiving part intersect at right angles to form a sensitive area. When dust passes through the sensitive area, its scattered light at 90° is transmitted through the slit into the photomultiplier and converted into photocurrent. The photocurrent is converted into the number of pulses per unit time that is proportional to the scattered light by the PLC controller, and the dust concentration in the air is measured.

[0016] The present invention provides a mine dust concentration detection device with the following beneficial effects: 1. The present invention can transmit the rotational force to the rack through the first gear and the fourth gear, thereby driving the sealing disk to move outward, and the dust removal block connected to the second connecting rod on the inner wall of the sealing disk can then wipe off the dust on the surface of the parallel beam lamp and the photomultiplier, thereby solving the problem that most traditional dust concentration detection equipment requires a long time to work, so that some dust particles will adhere to the sensor surface of the detection equipment, causing the sensor to be blocked, thereby resulting in a decrease in detection accuracy.

[0017] 2. The present invention drives the first transmission shaft to rotate by outputting rotational force through the motor, and utilizes the second gear on the outer wall of the first transmission shaft to transmit the rotational force to the third gear through the transmission belt, and then drives the second transmission shaft to rotate through the third gear, and then drives the first rotating plate and the second rotating plate to rotate at the same time through the second transmission shaft and the first transmission shaft, so as to achieve uniform passage of air through the detection cylinder and ensure the accuracy of the detection data. At the same time, the second transmission shaft and the first gear and the fourth gear on the outer wall of the first transmission shaft can transmit the rotational force to the rack, thereby driving the sealing disk to move outward, so that the sealing disk can be opened to allow air to enter, and the opening of the sealing disk can drive the movement of the dust removal block, thereby achieving the effect of clearing dust on the surface of the parallel beam lamp and the photomultiplier.

[0018] 3. The present invention installs the sealing disk on both sides of the detection cylinder through the first connecting rod, thereby enabling the detection cylinder to be opened and closed, and facilitating sealing of both ends of the detection cylinder when not in use to prevent dust from entering and affecting detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention when it is working; Figure 3 This is a schematic diagram of the internal three-dimensional structure of the detection tube of the present invention; Figure 4 It is a schematic diagram of the partial cross-sectional structure of the first mounting hole of the present invention; Figure 5 This is a schematic diagram of the inner structure of the sealing disk of the present invention; Figure 6 It is a schematic diagram of the partial three-dimensional structure of the first rotating plate and the second rotating plate of the present invention; Figure 7 Schematic diagram of the cross-sectional structure of the fixing seat of the present invention; Figure 8 It is a schematic diagram of the partial cross-sectional structure of the detection tube of the present invention.

[0020] Among them, 1. Sealing cover; 2. Handle; 3. Control panel; 4. Fixed seat; 5. Equipment box; 6. Detection tube; 7. First connecting rod; 8. Sealing disk; 9. Rack; 10. Electric push rod; 11. Stable seat; 12. Mounting slot; 13. First groove; 14. First mounting hole; 15. Parallel beam lamp; 16. Second mounting hole; 17. Second groove; 18. Photomultiplier; 19. Slider; 20. Dust removal block; 21. Second connecting rod; 22. First rotating plate; 23. First gear; 24. Drive belt; 25. First transmission shaft; 26. Second gear; 27. Motor; 28. Third gear; 29. Second transmission shaft; 30. Fourth gear; 31. Second rotating plate. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] Please see the attached Figure 1 -Attached Figure 6 , an embodiment of the present invention provides a mine dust concentration detection device, including a detection cylinder 6, a detection device is provided on the inner wall of the detection cylinder 6, a ventilation device is provided inside the detection cylinder 6, the ventilation device is connected to a driving device through a first transmission shaft 25 and a second transmission shaft 29, the driving device is located on the outer wall of the detection cylinder 6, the outer wall of the first transmission shaft 25 is provided with a first gear 23, the outer wall of the second transmission shaft 29 is provided with a fourth gear 30, both sides of the detection cylinder 6 are connected to a closing device through a first connecting rod 7, the upper and lower ends of the inner side of the closing device are fixedly connected to a dust removal block 20 through a second connecting rod 21, the dust removal block 20 is made of sponge material, and the outer wall of the dust removal block 20 is arc-shaped, the closing device is connected to the first gear 23 and the fourth gear 30 through a transmission device, a protective device is provided on the outside of the detection cylinder 6, a control panel 3 is provided on the outer wall of the protective device, a PLC controller is provided inside the protective device, and the detection device and the driving device are electrically connected to the control panel 3 through the PLC controller.

[0023] Specifically, the detection cylinder 6 can be used to contain dust; the detection device can be used to detect dust concentration; the ventilation device can be used to transport external air to the inside of the detection cylinder 6; the first transmission shaft 25 and the second transmission shaft 29 can be used to transport the rotational force from the driving device to the ventilation device; the first gear 23 and the fourth gear 30 can be used to transmit the rotational force transmitted by the first transmission shaft 25 to the external structure; the first connecting rod 7 can be used to support the closing device on both sides of the detection cylinder 6; the second connecting rod 21 can be used to fix the dust removal block 20 on the inside of the closing device; the dust removal block 20 can be used to wipe the dust on the surface of the detection device, thereby improving the traditional dust concentration detection equipment, which mostly needs to work for a long time, and thus some dust will be generated. Dust particles adhere to the sensor surface of the detection equipment, causing the sensor to be blocked, which will result in a problem of reduced detection accuracy; the dust removal block 20 is made of sponge material, which can effectively wipe away dust; the outer wall of the dust removal block 20 is arc-shaped, which can fit the outer wall of the detection equipment, thereby further improving the efficiency of dust removal; the transmission device can convert the rotational force of the first gear 23 and the fourth gear 30 into a moving force, thereby opening the closing device, and at the same time pulling the dust removal block 20 outward through the second connecting rod 21, thereby wiping away dust on the surface of the detection device; the protective device can be used to store and protect the equipment when the detection equipment does not need to work; the control command can be input into the PLC controller through the control panel 3, and the detection device and the drive device can be controlled by the PLC controller.

[0024] Please see the attached Figure 3 The detection device includes a parallel beam lamp 15 and a photomultiplier 18. The parallel beam lamp 15 is opened on the upper part of the inner wall of the detection tube 6, and a second groove 17 is opened on the lower part of the inner wall of the detection tube 6. The parallel beam lamp 15 is located inside the first groove 13, and the photomultiplier 18 is located inside the second groove 17.

[0025] Specifically, when air passes through the parallel beam lamp 15, the parallel light intersects the field of view of the light receiving part at right angles to form a sensitive area. When dust passes through the sensitive area, its scattered light in the 90° direction passes through the slit and enters the photomultiplier 18 to be converted into photocurrent. The photocurrent is converted into the number of pulses per unit time that is proportional to the scattered light through the PLC controller, and the dust concentration in the air is measured.

[0026] Please see the attached Figure 6The ventilation device includes a first rotating plate 22 and a second rotating plate 31. The middle part of the first rotating plate 22 is fixedly connected to the outer wall of the first transmission shaft 25, and the middle part of the second rotating plate 31 is fixedly connected to the outer wall of the second transmission shaft 29. The two fourth gears 30 are located on the front and rear sides of the second rotating plate 31, and the two first gears 23 are located on the front and rear sides of the first rotating plate 22.

[0027] Specifically, the air flows through the inner wall of the detection cylinder 6 by the rotation of the first rotating plate 22 and the second rotating plate 31 ; the rotational force can be transmitted to the first rotating plate 22 through the first transmission shaft 25 ; the rotational force can be transmitted to the second rotating plate 31 through the second transmission shaft 29 .

[0028] Please see the attached Figure 3 and attached Figure 8 The driving device includes a motor 27, the outer wall of the motor 27 is fixedly connected to the inner wall of the equipment box 5, the side wall of the equipment box 5 is fixedly connected to the side wall of the detection cylinder 6, the output end of the motor 27 is fixedly provided at the end of the first transmission shaft 25, and a second gear 26 is fixedly provided on the outer wall of the first transmission shaft 25 close to the motor 27. A third gear 28 is fixedly provided on the outer wall of the second transmission shaft 29 close to the equipment box 5. The third gear 28 is connected to the second gear 26 through a transmission belt 24. A second mounting hole 16 is opened on the side of the detection cylinder 6 close to the equipment box 5. The first transmission shaft 25 and the second transmission shaft 29 pass through the outer wall of the detection cylinder 6 through the second mounting hole 16. The first transmission shaft 25 and the second transmission shaft 29 are rotatably connected to the inner wall of the detection cylinder 6 at one end away from the equipment box 5.

[0029] Specifically, the motor 27 can output the rotational force; the equipment box 5 can serve to house the motor 27 and protect the internal structure; the output end of the motor 27 is fixedly provided at the end of the first transmission shaft 25, thereby the rotational force output by the motor 27 can be transmitted to the inside of the first transmission shaft 25; the second gear 26 can transmit the rotational force of the first transmission shaft 25 to the third gear 28 through the transmission belt 24; the third gear 28 can transmit the rotational force transmitted by the transmission belt 24 to the second transmission shaft 29; thereby, the first transmission shaft 25 and the second transmission shaft 29 can be driven to rotate at the same time by the motor 27; the second mounting hole 16 can serve to install the first transmission shaft 25 and the second transmission shaft 29, so that the first transmission shaft 25 and the second transmission shaft 29 can only rotate along the center of the second mounting hole 16 to avoid axial movement; the first transmission shaft 25 and the second transmission shaft 29 are rotatably connected to the inner wall of the detection cylinder 6 at one end away from the equipment box 5, thereby enabling the first transmission shaft 25 and the second transmission shaft 29 to rotate smoothly and thus transmit efficiently.

[0030] Please see the attached Figure 2The sealing device includes a sealing disk 8, which is located on both sides of the detection cylinder 6.

[0031] Specifically, the sealing disk 8 can be closed when the detection device does not need to work, thereby preventing debris and dust from entering the interior of the detection tube 6, thereby protecting the parallel beam lamp 15 and the photomultiplier 18.

[0032] Please see the attached Figure 5 and attached Figure 8 The transmission device includes a rack 9, the end of which is fixedly connected to the side of the sealing disk 8 close to the detection cylinder 6, and the tooth end of the rack 9 is meshed with the tooth end of the first gear 23 and the tooth end of the fourth gear 30.

[0033] Specifically, the rotational force of the first gear 23 and the fourth gear 30 can be transmitted to the sealing disk 8 through the rack 9, thereby pushing the sealing disk 8 to the two sides of the detection cylinder 6. The teeth of the rack 9 close to the motor 27 are downward and located at the upper part of the first gear 23, and the teeth of the rack 9 away from the motor 27 are upward and located at the lower part of the fourth gear 30. Therefore, when the first gear 23 and the fourth gear 30 rotate in the same direction, the rack 9 can drive the sealing disk 8 to move in opposite directions.

[0034] Please see the attached Figure 1 and attached Figure 2 The protective device includes a fixing base 4, a mounting groove 12 is opened inside the fixing base 4, the detection tube 6 is located inside the mounting groove 12, a sealing cover 1 is provided on the upper part of the mounting groove 12, and a handle 2 is provided on the top of the sealing cover 1.

[0035] Specifically, the fixing seat 4 and the mounting groove 12 can be used to install the detection cylinder 6; the sealing cover 1 can seal the mounting groove 12 to protect the detection cylinder 6; the handle 2 allows the staff to easily open the sealing cover 1.

[0036] Please see the attached Figure 1 and attached Figure 2 A stabilizing seat 11 is provided inside the mounting groove 12 , and the top of the stabilizing seat 11 is arc-shaped.

[0037] Specifically, the stabilizing seat 11 can support the detection cylinder 6; the top of the stabilizing seat 11 is arc-shaped and can fit the bottom outer wall of the detection cylinder 6, thereby providing better supporting force for the detection cylinder 6, thereby preventing the detection cylinder 6 from moving during transportation.

[0038] Please see the attached Figure 1 and attached Figure 2 The bottom of the detection tube 6 is fixedly connected to the output end of the electric push rod 10 , and the side of the electric push rod 10 away from the output end is fixedly connected to the inner bottom of the installation groove 12 .

[0039] Specifically, the electric push rod 10 can lift the detection tube 6, thereby making the detection tube 6 contact the air and work efficiently.

[0040] Please see the attached Figure 4 and attached Figure 5 The end of the first connecting rod 7 away from the sealing disk 8 is fixedly connected with a slider 19, the slider 19 is slidably connected to the inner wall of the slide groove, the slide groove is connected to the first mounting hole 14, and the diameter of the slider 19 and the slide groove is larger than the diameter of the first mounting hole 14.

[0041] Specifically, the slider 19 can move axially inside the slide groove; it is connected to the first mounting hole 14 through the slide groove, and the diameter of the slider 19 and the slide groove is larger than the diameter of the first mounting hole 14, thereby ensuring that the slider 19 is always located inside the slide groove, thereby preventing excessive movement from causing the slider 19 to derail.

[0042] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A mine dust concentration detection device, comprising a detection tube (6), characterized in that: The inner wall of the detection cylinder (6) is provided with a detection device, and the interior of the detection cylinder (6) is provided with a ventilation device, and the ventilation device is connected to a driving device through a first transmission shaft (25) and a second transmission shaft (29), and the driving device is located on the outer wall of the detection cylinder (6), and the outer wall of the first transmission shaft (25) is provided with a first gear (23), and the outer wall of the second transmission shaft (29) is provided with a fourth gear (30), and both sides of the detection cylinder (6) are connected to a closing device through a first connecting rod (7), and the upper and lower ends of the inner side of the closing device are fixedly connected to a dust removal block (20) through a second connecting rod (21), and the dust removal block (20) is made of sponge material, and the outer wall of the dust removal block (20) is arc-shaped, and the closing device is connected to the first gear (23) and the fourth gear (30) through the transmission device, and a protective device is provided on the outside of the detection cylinder (6), and a control panel (3) is provided on the outer wall of the protective device, and a PLC controller is provided inside the protective device, and the detection device and the driving device are both electrically connected to the control panel (3) through the PLC controller.

2. A mine dust concentration detection device according to claim 1, characterized in that: The detection device comprises a parallel beam lamp (15) and a photomultiplier (18); the parallel beam lamp (15) is provided on the upper portion of the inner wall of the detection cylinder (6); a second groove (17) is provided on the lower portion of the inner wall of the detection cylinder (6); the parallel beam lamp (15) is located inside the first groove (13); and the photomultiplier (18) is located inside the second groove (17).

3. The mine dust concentration detection equipment according to claim 1, characterized in that: The ventilation device comprises a first rotating plate (22) and a second rotating plate (31), wherein the middle portion of the first rotating plate (22) is fixedly connected to the outer wall of the first transmission shaft (25), and the middle portion of the second rotating plate (31) is fixedly connected to the outer wall of the second transmission shaft (29), the two fourth gears (30) are located on the front and rear sides of the second rotating plate (31), and the two first gears (23) are located on the front and rear sides of the first rotating plate (22).

4. The mine dust concentration detection equipment according to claim 1, characterized in that: The driving device includes a motor (27), an outer wall of the motor (27) is fixedly connected to the inner wall of the equipment box (5), and a side wall of the equipment box (5) is fixedly connected to the side wall of the detection cylinder (6). The output end of the motor (27) is fixedly arranged at the end of the first transmission shaft (25), a second gear (26) is fixedly arranged on the side of the outer wall of the first transmission shaft (25) close to the motor (27), a third gear (28) is fixedly arranged on the side of the outer wall of the second transmission shaft (29) close to the equipment box (5), and the third gear (28) is connected to the second gear (26) through a transmission belt (24). A second mounting hole (16) is opened on the side of the detection cylinder (6) close to the equipment box (5), the first transmission shaft (25) and the second transmission shaft (29) pass through the outer wall of the detection cylinder (6) through the second mounting hole (16), and the first transmission shaft (25) and the second transmission shaft (29) are rotatably connected to the inner wall of the detection cylinder (6) at one end away from the equipment box (5).

5. The mine dust concentration detection equipment according to claim 4, characterized in that: The sealing device comprises a sealing disk (8), and the sealing disk (8) is located on both sides of the detection cylinder (6).

6. The mine dust concentration detection device according to claim 5, characterized in that: The transmission device comprises a rack (9), the end of which is fixedly connected to a side of the sealing disk (8) close to the detection cylinder (6), and the tooth end of the rack (9) is meshedly connected with the tooth ends of the first gear (23) and the fourth gear (30).

7. The mine dust concentration detection device according to claim 5, characterized in that: The protective device comprises a fixing seat (4), a mounting groove (12) is provided inside the fixing seat (4), the detection cylinder (6) is located inside the mounting groove (12), a sealing cover plate (1) is provided on the upper part of the mounting groove (12), and a handle (2) is provided on the top of the sealing cover plate (1).

8. The mine dust concentration detection device according to claim 7, characterized in that: A stabilizing seat (11) is provided inside the installation groove (12), and the top of the stabilizing seat (11) is arc-shaped.

9. The mine dust concentration detection device according to claim 8, characterized in that: The bottom of the detection cylinder (6) is fixedly connected to the output end of the electric push rod (10), and the side of the electric push rod (10) away from the output end is fixedly connected to the inner bottom of the installation groove (12).

10. The mine dust concentration detection device according to claim 6, characterized in that: A slider (19) is fixedly connected to one end of the first connecting rod (7) away from the sealing disk (8), and the slider (19) is slidably connected to the inner wall of the slide groove, and the slide groove is connected to the first mounting hole (14), and the diameter of the slider (19) and the slide groove is larger than the diameter of the first mounting hole (14).

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