Coal mine gas concentration visual detection device with self-cleaning lens

Abstract

The application discloses a coal mine gas concentration visual detection device with a self-cleaning lens, which comprises a gas concentration visual probe body and a probe lens installed on the gas concentration visual probe body, further comprises a positioning assembly installed on the gas concentration visual probe body, a jet nozzle installed on the positioning assembly, a first air conveying pipe fixedly connected to the jet nozzle and conveying air to the jet nozzle, a negative pressure assembly and a scraping assembly installed on the gas concentration visual probe body, and an air compressor connected to the first air conveying pipe, and air flow is conveyed to the jet nozzle through the first air conveying pipe and sprayed to the probe lens. The jet nozzle sprays high-speed air flow to the probe lens to realize non-contact cleaning, replaces the traditional scraping structure, avoids the problem that quartz particles in coal dust scratch the optical coating, effectively protects the lens transmittance and image definition, and guarantees the long-term precision and stability of the gas concentration visual detection.

Description

Technical Field

[0001] This invention relates to the field of coal mine operation technology, specifically to a visual detection device for coal mine gas concentration equipped with a self-cleaning lens. Background Technology

[0002] In underground coal mine operations, the real-time and accurate detection of gas concentration is directly related to the safety of workers and the safety of mine production. However, dust accumulation and fogging on the lens can seriously affect the detection accuracy and lead to false alarms and missed alarms. A detection structure with self-cleaning function is a key link to ensure stable gas concentration detection and adapt to the complex underground environment. This device can achieve accurate visual detection of gas concentration, and the lens self-cleaning function can effectively remove dust and water mist, avoid detection interference, adapt to the harsh underground coal mine environment, and provide reliable protection for coal mine gas safety detection.

[0003] In the existing technology, most self-cleaning lenses adopt a scraping structure, that is, a rubber scraper driven by a micro motor reciprocates to scrape off coal dust on the lens surface. However, coal dust in the coal mining environment contains quartz particles (hardness of about 7 Mohs). When the scraper pushes the hard particles across the lens surface, the particles will scratch the optical coating of the lens like an abrasive, resulting in reduced light transmittance and blurred images, which in turn reduces the detection accuracy. Summary of the Invention

[0004] The purpose of this invention is to provide a visual detection device for coal mine gas concentration with a self-cleaning lens, so as to solve the problem mentioned in the background art that conventional scraping type devices are prone to causing quartz particles to scratch the lens during scraping.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a visual detection device for coal mine gas concentration with a self-cleaning lens, comprising a gas concentration visual probe body and a probe lens mounted on the gas concentration visual probe body, further comprising a positioning component mounted on the gas concentration visual probe body, a jet nozzle mounted on the positioning component, a first air supply pipe fixedly connected to the jet nozzle to supply air to the jet nozzle, a negative pressure component and a scraping component mounted on the gas concentration visual probe body, wherein an air compressor is externally connected through the first air supply pipe, and airflow is supplied to the jet nozzle and sprayed onto the probe lens through the first air supply pipe.

[0006] Based on the preferred embodiment of this technical solution, the gas concentration visual probe body has a through groove above the probe lens, and the jet nozzle and the first gas delivery pipe pass through the through groove when moving.

[0007] In a preferred embodiment of this technical solution, the positioning component includes a rotating rod fixedly connected to the nozzle, a first hinge seat fixedly connected to the nozzle, a second hinge seat fixedly connected to the gas concentration visual probe body, and a first electric telescopic rod rotatably connected to the second hinge seat. The output end of the first electric telescopic rod is rotatably connected to the first hinge seat, and the rotating rod is rotatably connected to the gas concentration visual probe body. The extension and retraction of the output end of the first electric telescopic rod drives the nozzle to rotate on the gas concentration visual probe body via the rotating rod, causing the output port of the nozzle to rotate to a preset angle facing the probe lens.

[0008] According to the preferred embodiment of this technical solution, the positioning component includes a guide frame fixedly connected to the gas concentration visual probe body, a second electric telescopic rod fixedly connected to the gas concentration visual probe body, a slide plate fixedly connected to the output end of the second electric telescopic rod, and a support frame fixedly connected to the slide plate. The support frame is fixedly connected to the nozzle.

[0009] In the preferred embodiment of this technical solution, the guide frame has a groove at the corresponding position of the slide plate, and the output end of the second electric telescopic rod extends and retracts to drive the slide plate to slide in the groove.

[0010] Based on the preferred embodiment of this technical solution, the jet nozzle is tilted towards the probe lens, and the jet nozzle is tilted between 15 and 45 degrees relative to the probe lens.

[0011] According to the preferred embodiment of this technical solution, the negative pressure component includes an air inlet fixedly connected to the gas concentration visual probe body, an air pump fixedly connected to the gas concentration visual probe body, and a second air supply pipe fixedly connected between the air pump input end and the air inlet. The air pump draws air around the probe lens through the second air supply pipe and the air inlet, so that the area around the probe lens is under negative pressure.

[0012] According to the preferred embodiment of this technical solution, the scraping assembly includes a third electric telescopic rod fixedly connected to the body of the gas concentration visual probe, a slotted plate fixedly connected to the output end of the third electric telescopic rod, a movable plate slidably connected to the slotted plate, a spring fixedly connected between the movable plate and the slotted plate, and a scraper fixedly connected to the end of the movable plate away from the spring, with the scraper in contact with the probe lens.

[0013] In this preferred embodiment of the technical solution, the scraper contacts the probe lens at an angle, and the angle of inclination of the scraper relative to the probe lens is between 30 and 45 degrees.

[0014] In the preferred embodiment of this technical solution, the groove plate has a limiting groove at the corresponding position of the moving plate, and when the spring is compressed or extended, the moving plate slides in the limiting groove.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. The jet nozzle sprays high-speed airflow onto the probe lens to achieve non-contact cleaning, replacing the traditional scraping structure. This avoids the problem of quartz particles in coal dust scratching the optical coating, effectively protecting the lens transmittance and image clarity, and ensuring the long-term accuracy and stability of visual gas concentration detection.

[0016] 2. According to Embodiment 1 of the positioning component, the swing-type positioning component consisting of a rotating rod and a first electric telescopic rod can precisely adjust the jet angle of the jet nozzle, so that the high-speed airflow impacts the lens surface at the optimal incident angle, which significantly improves the blowing efficiency and fixed-point cleaning capability.

[0017] 3. In Embodiment 2 of the positioning component, a translational positioning component consisting of a guide frame and a second electric telescopic rod is used to drive the jet nozzle to translate and sweep along the lens surface, achieving uniform coverage of the entire area of ​​the probe lens without any cleaning dead corners.

[0018] 4. By using the air pump and air inlet in the negative pressure component to create a negative pressure zone around the probe lens, the dust and water mist blown up by the airflow are actively sucked out, effectively preventing secondary sedimentation of pollutants and further improving the cleaning durability.

[0019] 5. The scraping component adopts an elastic floating scraper and spring buffer structure, which contacts the lens at an angle to help remove stubborn attachments when necessary, while avoiding rigid scraping damage, thus balancing thorough cleaning and lens protection. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of one embodiment of the visual detection device for coal mine gas concentration with a self-cleaning lens according to the present invention. Figure 2 This is a partial cross-sectional view of the main body of the gas concentration visual probe of the present invention; Figure 3 This is a schematic diagram of the structure of a positioning component according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the positioning component in Embodiment 2 of the present invention; Figure 5 This is a schematic diagram of the assembly structure of the jet nozzle and the probe lens of the present invention; Figure 6 This is a schematic diagram of the negative pressure component structure of the present invention; Figure 7 This is a schematic diagram of the scraping component structure of the present invention; Figure 8 This is a cross-sectional view of the scraping component of the present invention.

[0021] In the diagram: 11. Gas concentration visual probe body; 12. Probe lens; 13. Nozzle; 14. First gas supply pipe; 21. Rotating rod; 22. First hinge seat; 23. Second hinge seat; 24. First electric telescopic rod; 31. Guide frame; 32. Second electric telescopic rod; 33. Slide plate; 34. Support frame; 41. Air inlet; 42. Air pump; 43. Second gas supply pipe; 51. Third electric telescopic rod; 52. Slot plate; 53. Moving plate; 54. Spring; 55. Scraper. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Please see Figure 1 - Figure 8 This invention provides an embodiment of a visual detection device for coal mine gas concentration with a self-cleaning lens, comprising a gas concentration visual probe body 11 and a probe lens 12 mounted on the gas concentration visual probe body 11, a positioning component mounted on the gas concentration visual probe body 11, a nozzle 13 mounted on the positioning component, a first air supply pipe 14 fixedly connected to the nozzle 13 to supply air to the nozzle 13, a negative pressure component and a scraping component mounted on the gas concentration visual probe body 11, and an external air compressor connected through the first air supply pipe 14 to supply airflow to the nozzle 13. The gas concentration visual probe body 11 is equipped with an explosion-proof shell, which is suitable for the underground environment of coal mines. The probe lens 12 is made of high-transmittance optical glass with an anti-reflective coating and a dustproof coating on the surface. The air nozzle 13 is made of stainless steel and has a flat fan-shaped outlet that can generate high-speed airflow. The first air supply pipe 14 is a high-pressure resistant hose that is connected to the underground compressed air network or an independent air compressor. The high-speed airflow impacts the surface of the probe lens 12, blowing away the attached coal dust and water mist, achieving non-contact cleaning. This fundamentally avoids the problem of hard particles scratching the optical coating in scraping cleaning, ensuring the long-term transmittance and detection accuracy of the lens.

[0024] Please see Figure 1 , Figure 4 and Figure 5A further solution based on this embodiment is as follows: the gas concentration visual probe body 11 has a through groove above the probe lens 12, and the nozzle 13 and the first gas supply pipe 14 pass through the through groove when moving. The through groove is a long strip opening with a width slightly larger than the outer diameter of the nozzle 13 and the first gas supply pipe 14, allowing the nozzle 13 to move or swing along the through groove under the drive of the positioning component. At the same time, a sealing brush can be set on the edge of the through groove to prevent external coal slag from passing through the through groove to a certain extent, which not only ensures the freedom of movement of the nozzle 13, but also avoids large coal slag falling at the position of the through groove.

[0025] Please see Figure 1 - Figure 3 One embodiment based on the positioning component is as follows: The positioning component includes a rotating rod 21 fixedly connected to the nozzle 13, a first hinge seat 22 fixedly connected to the nozzle 13, a second hinge seat 23 fixedly connected to the gas concentration visual probe body 11, and a first electric telescopic rod 24 rotatably connected to the second hinge seat 23. The output end of the first electric telescopic rod 24 is rotatably connected to the first hinge seat 22, and the rotating rod 21 is rotatably connected to the gas concentration visual probe body 11. The extension and retraction of the output end of the first electric telescopic rod 24 drives the nozzle 13 to rotate on the gas concentration visual probe body 11 through the rotating rod 21, so that the output port of the nozzle 13 rotates to a preset angle toward the probe lens 12. This positioning component constitutes a swing mechanism: the rotating rod 21 serves as a fulcrum, the first electric telescopic rod 24 serves as a power source, and they are connected through the first hinge seat 22 and the second hinge seat 23. When the first electric telescopic rod 24 extends or retracts, it pushes the jet nozzle 13 to swing around the axis of the rotating rod 21, which can precisely adjust the jet angle so that the airflow impacts the lens surface at the best incident angle, improving cleaning efficiency. This structure is simple and compact and is suitable for probes with limited space.

[0026] Please see Figure 4 and Figure 5 The second embodiment based on the positioning component is as follows: The positioning component includes a guide frame 31 fixedly connected to the gas concentration visual probe body 11, a second electric telescopic rod 32 fixedly connected to the gas concentration visual probe body 11, a slide plate 33 fixedly connected to the output end of the second electric telescopic rod 32, and a support frame 34 fixedly connected to the slide plate 33. The support frame 34 is fixedly connected to the nozzle 13. The positioning component is a translational structure: the guide frame 31 is fixed to the probe body, the second electric telescopic rod 32 drives the slide plate 33 to move linearly along the guide frame 31, and the support frame 34 moves with the slide plate 33 to drive the nozzle 13 to translate, so that the air outlet of the nozzle 13 sweeps over the probe lens 12, realizing full coverage blowing of the entire lens surface, which is particularly suitable for scenarios with large lens areas.

[0027] Please see Figure 4 and Figure 5A further solution based on this embodiment is as follows: the guide frame 31 has a groove at the corresponding position of the slide plate 33, and the output end of the second electric telescopic rod 32 extends and retracts to drive the slide plate 33 to slide in the groove. The groove is T-shaped or dovetail groove, which is precisely matched with the slide plate 33 to provide straight guidance for the slide plate 33, prevent deviation or jamming during movement, ensure the stability of the movement trajectory of the jet nozzle 13, and ensure that the airflow is always aligned with the effective area of ​​the lens.

[0028] Please see Figure 5 A further solution based on this embodiment is as follows: the nozzle 13 is tilted towards the probe lens 12, and the nozzle 13 is tilted between 15 and 45 degrees relative to the probe lens 12. This tilt angle causes the high-speed airflow to form an acute angle impact with the lens surface, which can not only peel off and blow away the attached coal dust from the lens, but also avoid the airflow rebound during vertical blowing, which would bring the dust back to the lens. Experiments have shown that the cleaning effect is best in the range of 15° to 45°, and at the same time, the impact force of the airflow on the lens is uniform and will not damage the coating.

[0029] Please see Figure 1 and Figure 6 A further solution based on this embodiment is as follows: The negative pressure assembly includes an air inlet 41 fixedly connected to the gas concentration visual probe body 11, an air pump 42 fixedly connected to the gas concentration visual probe body 11, and a second air supply pipe 43 fixedly connected between the input end of the air pump 42 and the air inlet 41. The air pump 42 draws air from around the probe lens 12 through the second air supply pipe 43 and the air inlet 41, creating a negative pressure around the probe lens 12. The air inlet 41 is located near the probe lens 12. When the air pump 42 is running, it draws air through the second air supply pipe 43, forming a local negative pressure zone in front of the probe lens 12. This negative pressure can promptly remove coal dust blown up by the air jet, preventing the dust from settling onto the lens again. At the same time, it can actively remove water mist from the lens surface, significantly improving the cleaning effect and durability. A filter component, such as a filter element, can be installed inside the air inlet 41 to avoid blockage of the air inlet 41 and the second air supply pipe 43 due to prolonged use, preventing coal dust from entering the air pump 42.

[0030] Please see Figure 1 , Figure 7 and Figure 8A further solution based on this embodiment is as follows: The scraping assembly includes a third electric telescopic rod 51 fixedly connected to the gas concentration visual probe body 11, a slot plate 52 fixedly connected to the output end of the third electric telescopic rod 51, a movable plate 53 slidably connected to the slot plate 52, a spring 54 fixedly connected between the movable plate 53 and the slot plate 52, and a scraper 55 fixedly connected to the end of the movable plate 53 away from the spring 54. The scraper 55 is in contact with the probe lens 12. The scraping assembly serves as an auxiliary cleaning method to remove stubborn deposits (such as dried mud spots) that are difficult to blow away by air jets. The third electric telescopic rod 51 drives the slot plate 52 to move. Under the elastic pressure of the spring 54, the movable plate 53 causes the scraper 55 to adhere to the lens surface with constant pressure, scraping away stubborn stains. The spring 54 provides cushioning to avoid rigid contact that could scratch the lens, and it is only activated when necessary. Daily cleaning still relies mainly on air jets to minimize the number of scraping operations.

[0031] Please see Figure 8 A further solution based on this embodiment is as follows: the scraper 55 contacts the probe lens 12 at an angle, and the angle of inclination of the scraper 55 relative to the probe lens 12 is between 30 and 45 degrees. When the scraper 55 is moved at an angle, the dirt is pushed away from the lens along the inclined surface of the scraper 55, instead of being pushed and rolling on the lens surface, which reduces the risk of scratching the lens surface; at the same time, the angle of inclination makes the contact line between the scraper 55 and the lens narrower, increases the pressure per unit area, and improves the ability to scrape off stubborn stains.

[0032] Please see Figure 8 A further solution based on this embodiment is as follows: the groove plate 52 has a limiting groove at the corresponding position of the moving plate 53, and when the spring 54 is compressed or extended, the moving plate 53 slides in the limiting groove. The limiting groove guides and limits the movement of the moving plate 53, ensuring that the scraper 55 always moves in a straight line without deflection, while preventing the spring 54 from being over-compressed or the moving plate 53 from coming off, thereby improving the movement stability and reliability of the scraping assembly.

[0033] Working principle: In the initial state, the gas concentration visual probe body 11 is fixed in the area to be measured in the coal mine, and the probe lens 12 faces the sampling point. When coal dust or water mist is detected on the surface of the probe lens 12, the control system starts the self-cleaning program. Using the positioning component embodiment one, the first electric telescopic rod 24 extends and retracts, and pushes the nozzle 13 to swing through the rotating rod 21 via the first hinge seat 22 and the second hinge seat 23, so that the air outlet of the nozzle 13 is aligned with the probe lens 12 at an angle of 15°~45°. If the positioning component embodiment two is used, the second electric telescopic rod 32 drives the slide plate 33 to move along the slide groove of the guide frame 31, and drives the nozzle 13 to translate through the support frame 34 while maintaining the tilt angle. Subsequently, the external air compressor delivers high-pressure air to the nozzle 13 through the first air supply pipe 14, and the nozzle 13 sprays high-speed airflow towards the probe. On the surface of lens 12, adhering coal dust and water mist are blown away. At the same time, the negative pressure component is activated, and the air pump 42 draws air around the probe lens 12 through the second air supply pipe 43 and the air inlet 41 to form a local negative pressure, which promptly sucks away the blown dust and prevents secondary sedimentation. For stubborn adhering substances (such as dried mud spots), the control system activates the scraping component, the third electric telescopic rod 51 retracts, and drives the groove plate 52 to move. Under the elastic pressure of the spring 54, the moving plate 53 causes the scraper 55 to adhere to the surface of the probe lens 12 at an angle of 30°~45°. The scraper 55 moves with the groove plate 52 to scrape the stubborn stains off the lens. The spring 54 provides cushioning to avoid rigid impact. During the scraping process, the air nozzle 13 and the negative pressure component work synchronously to blow away and suck away the scraped stains. After cleaning is completed, all components are reset, and the gas concentration visual probe body 11 continues to detect normally.

[0034] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A visual detection device for coal mine gas concentration with a self-cleaning lens, comprising a gas concentration visual probe body (11) and a probe lens (12) mounted on the gas concentration visual probe body (11), characterized in that: It also includes a positioning component installed on the gas concentration visual probe body (11), a jet nozzle (13) installed on the positioning component, a first air supply pipe (14) fixedly connected to the jet nozzle (13) to supply air to the jet nozzle (13), a negative pressure component and a scraping component installed on the gas concentration visual probe body (11), an external air compressor connected through the first air supply pipe (14), and airflow delivered to the jet nozzle (13) and sprayed onto the probe lens (12) through the first air supply pipe (14).

2. The visual detection device for coal mine gas concentration with a self-cleaning lens according to claim 1, characterized in that: The gas concentration visual probe body (11) has a through slot above the probe lens (12), and the jet nozzle (13) and the first gas delivery pipe (14) pass through the through slot when moving.

3. The visual detection device for coal mine gas concentration with a self-cleaning lens according to claim 1, characterized in that: The positioning assembly includes a rotating rod (21) fixedly connected to the nozzle (13), a first hinge seat (22) fixedly connected to the nozzle (13), a second hinge seat (23) fixedly connected to the gas concentration visual probe body (11), and a first electric telescopic rod (24) rotatably connected to the second hinge seat (23). The output end of the first electric telescopic rod (24) is rotatably connected to the first hinge seat (22), and the rotating rod (21) is rotatably connected to the gas concentration visual probe body (11). The extension and retraction of the output end of the first electric telescopic rod (24) drives the nozzle (13) to rotate on the gas concentration visual probe body (11) through the rotating rod (21), so that the output port of the nozzle (13) rotates to a preset angle toward the probe lens (12).

4. The visual detection device for coal mine gas concentration with a self-cleaning lens according to claim 1, characterized in that: The positioning assembly includes a guide frame (31) fixedly connected to the gas concentration visual probe body (11), a second electric telescopic rod (32) fixedly connected to the gas concentration visual probe body (11), a slide plate (33) fixedly connected to the output end of the second electric telescopic rod (32), and a support frame (34) fixedly connected to the slide plate (33). The support frame (34) is fixedly connected to the nozzle (13).

5. The visual detection device for coal mine gas concentration with a self-cleaning lens according to claim 4, characterized in that: The guide frame (31) has a groove at the corresponding position of the slide plate (33), and the output end of the second electric telescopic rod (32) extends and retracts to drive the slide plate (33) to slide in the groove.

6. The visual detection device for coal mine gas concentration with a self-cleaning lens according to claim 4, characterized in that: The nozzle (13) is tilted toward the probe lens (12), and the nozzle (13) is tilted between 15 and 45 degrees relative to the probe lens (12).

7. The visual detection device for coal mine gas concentration with a self-cleaning lens according to claim 1, characterized in that: The negative pressure assembly includes an air inlet (41) fixedly connected to the gas concentration visual probe body (11), an air pump (42) fixedly connected to the gas concentration visual probe body (11), and a second air supply pipe (43) fixedly connected between the input end of the air pump (42) and the air inlet (41). The air pump (42) draws air around the probe lens (12) through the second air supply pipe (43) and the air inlet (41) to create a negative pressure around the probe lens (12).

8. The visual detection device for coal mine gas concentration with a self-cleaning lens according to claim 1, characterized in that: The scraping assembly includes a third electric telescopic rod (51) fixedly connected to the gas concentration visual probe body (11), a slot plate (52) fixedly connected to the output end of the third electric telescopic rod (51), a movable plate (53) slidably connected to the slot plate (52), a spring (54) fixedly connected between the movable plate (53) and the slot plate (52), and a scraper (55) fixedly connected to the end of the movable plate (53) away from the spring (54). The scraper (55) is in contact with the probe lens (12).

9. The visual detection device for coal mine gas concentration with a self-cleaning lens according to claim 8, characterized in that: The scraper (55) contacts the probe lens (12) at an angle, and the angle of inclination of the scraper (55) relative to the probe lens (12) is between 30 and 45 degrees.

10. The visual detection device for coal mine gas concentration with a self-cleaning lens according to claim 8, characterized in that: The groove plate (52) has a limiting groove at the corresponding position of the moving plate (53), and when the spring (54) is compressed or extended, the moving plate (53) slides in the limiting groove.

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