A kind of unpowered light scattering method coal mine dust concentration detection device

Abstract

This application relates to a non-powered light scattering method for detecting coal mine dust concentration, belonging to the technical field of dust concentration detection. It includes a main body with a detection channel inside, and mounting cavities for a photodiode, a laser, and a light trap. The photodiode is located at the top of the detection channel, while the laser and light trap are located on opposite sides of the detection channel. It also includes a glass plate on the cavity wall of the mounting cavity, a vibration component for shaking dust off the glass plate, and a cleaning component for absorbing dust in the detection channel when the vibration component is activated. A drive component for raising and lowering the cleaning component is connected below it. The main body has a cleaning hole for the cleaning component to enter the detection channel, and a hidden door is rotatably installed at the top of the cleaning hole. A dust collection chamber is also provided inside the main body for collecting dust, thereby reducing the difficulty of cleaning the air path of the device. Afterwards, light scattering dust concentration detection is performed, ensuring the accuracy of the dust concentration detection.

Description

Technical Field

[0001] This application relates to the technical field of dust concentration detection, and in particular to a non-powered light scattering method for detecting coal mine dust concentration. Background Technology

[0002] The light scattering dust concentration detection device is based on the principle of light scattering. External dust is drawn into the device's air path, and a laser emits a beam. When dust particles pass through the photosensitive area and encounter the beam, the light is blocked and scattered. The scattered light is received by a photodiode and converted into an electrical signal. The signal processing circuit receives the electrical signal transmitted from the photodiode, and the dust concentration can be deduced based on the intensity of the scattered light. This device utilizes this physical phenomenon, capturing and analyzing the scattered light through a specific optical detection mechanism to obtain the dust concentration value.

[0003] Dust concentration detection devices with non-powered designs rely on the natural diffusion of dust or ambient airflow to allow dust to autonomously enter the detection area. They have a simpler structure, require no additional power, and have advantages such as low power consumption and easy maintenance.

[0004] Due to its non-powered design, the device's air passages are exposed. Even when the device is not in operation, dust can freely enter the air passages and photosensitive area due to the influence of natural airflow. Dust accumulation in the air passages and photosensitive area can affect the photodiode's ability to capture scattered light. However, the device has a high detection frequency and cannot clean the air passages before each detection. In turn, uncleaned air passages will affect the accuracy of dust concentration detection. Summary of the Invention

[0005] To reduce the difficulty of cleaning the gas path of the device and ensure the accuracy of dust concentration detection, this application provides a non-powered light scattering method coal mine dust concentration detection device.

[0006] The non-powered light scattering method coal mine dust concentration detection device provided in this application adopts the following technical solution:

[0007] A non-powered light scattering method for detecting coal mine dust concentration includes a body with a detection channel inside. The top and side walls of the detection channel have mounting cavities for installing a photodiode, a laser, and a light trap. The photodiode is located at the top of the detection channel, while the laser and light trap are located on opposite sides of the detection channel.

[0008] A glass plate, and a vibration assembly is connected between the cavity wall of the mounting cavity and the glass plate, the vibration assembly being used to shake dust away from the glass plate;

[0009] The cleaning component has an assembly cavity below the detection channel for mounting the cleaning component. The bottom of the detection channel has a cleaning hole for the cleaning component to enter the detection channel. Below the cleaning component is a drive component for lifting and lowering the cleaning component. A hidden door is rotatably installed at the top of the cleaning hole. The top of the hidden door is flush with the bottom of the detection channel. The cleaning component is used to absorb dust in the detection channel when the vibration component is activated. The body has a dust collection chamber for collecting the dust extracted by the cleaning component.

[0010] By adopting the above technical solution, before dust concentration detection, the vibration component controls the glass plate on the photodiode, laser, and light trap to vibrate, shaking the dust off the glass plate. At the same time, the drive component moves the cleaning component upward, pushing it away from the dark door and into the detection channel. The cleaning component then begins to extract the dust floating in the detection channel. Afterward, the cleaning component moves downward, the dark door returns to its original position, and the bottom of the detection channel remains smooth, thereby reducing the difficulty of cleaning the gas path of the device. Then, light scattering dust concentration detection is performed, ensuring the accuracy of dust concentration detection of the device.

[0011] Optionally, the vibration assembly includes a mounting frame, silicone gaskets, and piezoelectric ceramic sheets;

[0012] The mounting frame is installed on the cavity wall of the mounting cavity. The silicone gasket is installed on the inner ring of the mounting frame and has a slot for engaging with the glass sheet. The glass sheet is pressed against the silicone gasket and has a light-shielding area near the inner surface of the silicone gasket. The piezoelectric ceramic sheet is installed on the light-shielding area of ​​the glass sheet with thermally conductive adhesive. Several piezoelectric ceramic sheets are arranged around the edges and corners of the glass sheet.

[0013] Optionally, the cleaning assembly includes a cleaning air column, a connecting air pipe, and a vacuum pump;

[0014] The air pump is located inside the assembly cavity and its air inlet is connected to the cleaning air column via a connecting air pipe. The air outlet of the air pump is connected to a dust guide pipe that communicates with the dust collection chamber. The cleaning air column is vertically arranged and there are several of them. The top of each cleaning air column has an upper air hole and the side wall has a side air hole. The interior of each cleaning air column has a main air hole that connects the upper air hole, the side air hole and the connecting air pipe.

[0015] Optionally, the drive assembly includes a drive base and a drive cylinder. The drive base is vertically slidably mounted on the cavity wall of the assembly cavity. The vacuum pump and the cleaning air column are both mounted on the drive base. The drive cylinder is mounted on the machine body and its output shaft is vertically arranged and connected to the drive base.

[0016] Optionally, the concealed door includes a door panel, concealed hinges, and a sealing ring;

[0017] The door panel is rotatably installed on the wall of the cleaning hole via a concealed hinge. The sealing ring is fitted onto the wall of the cleaning hole and abuts against the side wall of the door panel. The upper surface of the door panel is flush with the bottom of the detection channel. Both side walls of the door panel along its own rotation direction are provided with abutting slopes. The abutting slopes are arranged inclined from top to bottom along the direction close to the concealed hinge.

[0018] Optionally, the door panel includes a main board and a sub-board that are horizontally connected to each other, with a concealed hinge separating the main board and the sub-board. The main board is longer than the sub-board and is located directly above the cleaning air column.

[0019] Optionally, the detection channel includes a first airway, a second airway, and a third airway that are horizontally interconnected. The mounting cavity is connected to the second airway, and the diameter of the first airway and the third airway gradually increases at the ends away from the second airway.

[0020] Optionally, an air inlet and an air outlet are respectively provided on the two opposite sides of the body. The air inlet is connected to a vertically arranged air intake channel. The first air passage is connected to the bottom end of the air intake channel. The air outlet is connected to a vertically arranged air outlet channel. The third air passage is connected to the bottom end of the air outlet channel.

[0021] Optionally, dust collection plates are slidably connected to the bottom of both the air inlet channel and the air outlet channel. A sliding groove is provided on the body to slidably connect the dust collection plates along the layout direction of the detection channel. The sliding groove is connected to the assembly cavity. A return spring is connected between the dust collection plates. A return inclined surface is provided on the side of the dust collection plate facing the drive seat to slidably abut against the drive seat.

[0022] When the cleaning air column is located in the detection channel, the reset spring contracts, the dust collection plate is located in the sliding groove, and the air inlet channel and air outlet channel are both connected to the dust collection chamber.

[0023] In summary, this application includes at least one of the following beneficial technical effects of a non-powered light scattering method coal mine dust concentration detection device:

[0024] 1. Before dust concentration detection, the vibration component controls the glass plate on the photodiode, laser, and light trap to vibrate, shaking off the dust on the glass plate. At the same time, the drive component moves the cleaning component upward, pushing it away from the dark door and into the detection channel. The cleaning component begins to extract the dust floating in the detection channel. Afterward, the cleaning component moves downward, the dark door returns to its original position, and the bottom of the detection channel remains smooth, thereby reducing the difficulty of cleaning the gas path of the device. Then, the light scattering dust concentration detection is performed, which can ensure the accuracy of the dust concentration detection of the device.

[0025] 2. When the cleaning air column is located in the assembly cavity, the dust collection plate is located between the air inlet channel, the air outlet channel, and the dust collection chamber, sealing the air inlet and air outlet channels to form an air passage for external airflow. When the cleaning air column enters the detection channel, the dust collection plate gradually slides into the sliding groove through the return spring. During the sliding process, the dust is scraped off the dust collection plate by the bottom wall of the first and second air passages, and the scraped dust enters the dust collection chamber. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of a coal mine dust concentration detection device using the non-powered light scattering method according to this application.

[0027] Figure 2 This is a schematic diagram of the structure of the dust detection area of ​​the detection device in the embodiments of this application.

[0028] Figure 3 This is a schematic diagram showing the connection between the vibration component and the glass plate in an embodiment of this application.

[0029] Figure 4 yes Figure 3 An enlarged schematic diagram of part A in the middle.

[0030] Figure 5 This is a schematic diagram showing the locations of the cleaning component and the driving component in the embodiments of this application.

[0031] Figure 6 yes Figure 5 Enlarged schematic diagram of part B.

[0032] Figure 7 This is a schematic diagram showing the connection between the dust collection plate and the reset spring in an embodiment of this application.

[0033] In the diagram: 100, laser; 200, photodiode; 300, light trap;

[0034] 1. Body; 11. Air Inlet; 12. Air Inlet Channel; 13. Detection Channel; 131. First Airway; 132. Second Airway; 133. Third Airway; 14. Air Outlet Channel; 15. Air Outlet; 16. Dust Collection Chamber; 17. Cleaning Chamber; 171. Assembly Chamber; 172. Sliding Groove; 18. Cleaning Hole; 19. Mounting Chamber; 2. Glass Plate; 21. Light-Shielding Area; 3. Vibration Component; 31. Mounting Frame; 32. Silicone Gasket; 33. Piezoelectric Ceramic Sheet; 34. Thermally Conductive Adhesive; 35. Dust-Guiding Sloping Surface; 4. Dust collection plate; 41. Reset slope; 42. Sealing slope; 43. Connecting groove; 5. Reset spring; 6. Cleaning assembly; 61. Cleaning air column; 611. Upper air hole; 612. Side air hole; 613. Main air hole; 62. Connecting air pipe; 63. Air pump; 64. Dust guide pipe; 7. Drive assembly; 71. Drive base; 72. Drive cylinder; 8. Concealed door; 81. Door panel; 811. Main board; 812. Sub-board; 813. Abutment slope; 82. Concealed hinge; 83. Sealing ring; 9. Cleaning cover plate. Detailed Implementation

[0035] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0036] This application discloses a non-powered light scattering method for detecting coal mine dust concentration. (Refer to...) Figure 1 and Figure 2 The device includes a body 1, which contains a detection channel 13. The top and side walls of the detection channel 13 are provided with mounting cavities 19 for mounting a photodiode 200, a laser 100, and a light trap 300. The photodiode 200 is located at the top of the detection channel 13, and the laser 100 and the light trap 300 are located on opposite sides of the detection channel 13.

[0037] In this installation cavity 19, glass plates 2 are installed on the cavity wall facing the detection channel 13 to isolate dust. A vibration component 3 is connected between the cavity wall of the installation cavity 19 and the glass plates 2. The vibration component 3 can control the glass plates 2 to vibrate at a certain frequency with a small amplitude, thereby shaking off the dust attached to the glass plates 2.

[0038] The dust that is shaken off floats throughout the entire detection channel 13. In order to quickly collect this dust and prevent it from re-attaching to the glass plate 2, the cleaning component 6 needs to quickly extract the floating dust.

[0039] The main body 1 has an assembly cavity 171 below the detection channel 13 for installing the cleaning component 6. A cleaning hole 18 is provided at the bottom of the detection channel 13 for the cleaning component 6 to enter the detection channel 13. A drive component 7 is connected below the cleaning component 6. The drive component 7 controls the raising and lowering of the cleaning component 6. The bottom of the detection channel 13 needs to remain flat during dust concentration detection; therefore, a concealed door 8 is rotatably installed at the top of the cleaning hole 18. The top of the concealed door 8 is flush with the bottom of the detection channel 13.

[0040] Before dust concentration detection, the vibration component 3 controls the glass plate 2 on the photodiode 200, laser 100, and light trap 300 to vibrate, shaking the dust off the glass plate 2. At the same time, the drive component 7 moves the cleaning component 6 upward, pushing it away from the dark door 8 and into the detection channel 13. The cleaning component 6 then begins to extract the dust floating in the detection channel 13. Afterward, the cleaning component 6 moves downward, the dark door 8 returns to its original position, and the bottom of the detection channel 13 remains smooth, thereby reducing the difficulty of cleaning the gas path of the device. Then, the light scattering dust concentration detection is performed, which can ensure the accuracy of the dust concentration detection of the device.

[0041] To centrally store the dust extracted by the cleaning component 6, a dust collection chamber 16 is provided below the assembly cavity 171 in the machine body 1. The cleaning component 6 is connected to the dust collection chamber 16, thereby simultaneously extracting and conveying dust to the dust collection chamber 16. A cleaning cover plate 9 is detachably connected to one side of the machine body 1 where the light trap 300 is located. The light trap 300 is mounted on the cleaning cover plate 9. When the cleaning cover plate 9 is mounted on the machine body 1, its inner side forms the side wall of the detection channel 13, the dust collection chamber 16, and the assembly cavity 171. When it is necessary to clean the dust in the dust collection chamber 16, the dust in the dust collection chamber 16 can be cleaned by removing the cleaning cover plate 9. At the same time, the condition of the channel can be checked, facilitating subsequent maintenance.

[0042] Reference Figure 3 and Figure 4 The vibration assembly 3 includes a mounting frame 31, a silicone gasket 32, and a piezoelectric ceramic sheet 33.

[0043] Mounting frame 31 is installed on the cavity wall of mounting cavity 19. Silicone gasket 32 ​​is installed on the inner ring of mounting frame 31 and has a slot for engaging with glass plate 2. Glass plate 2 abuts against silicone gasket 32, and a light-shielding area 21 is provided near the inner surface of silicone gasket 32. Piezoelectric ceramic sheet 33 is installed on the light-shielding area 21 of glass plate 2 using thermally conductive adhesive 34. To ensure uniform force distribution around glass plate 2, several piezoelectric ceramic sheets 33 are arranged around the corners of glass plate 2, preferably four, with the four piezoelectric ceramic sheets 33 located at the four corners of glass plate 2.

[0044] The piezoelectric ceramic sheet 33 is preferably a circular piezoelectric ceramic sheet with a diameter of 5-8 mm and a thickness of 1-2 mm. The vibration frequency can be adjusted by voltage, with a range of 50-100 Hz. At this frequency, dust is easily detached and the glass sheet 2 is less likely to resonate and break. In coal mine dust environments, 80 Hz is preferred. The duration of a single vibration is controlled to 0.5-1 second to avoid continuous vibration causing optical path deviation. This causes the glass sheet 2 to produce "high-frequency micro-amplitude vibration" with an amplitude of approximately 5-10 μm. The attached dust separates from the glass sheet 2 due to inertia and falls off under the action of gravity or airflow.

[0045] To prevent the glass plate 2 from shattering during vibration, the glass plate 2 is preferably made of high-transmittance quartz glass with a thickness of 0.5-1mm, which is wear-resistant and has a light transmittance of >95%. The silicone gasket 32 ​​not only ensures the seal between the glass plate 2 and the frame, preventing dust from entering through gaps, but also allows the glass plate 2 to undergo slight displacement during vibration, while buffering the transmission of vibration to the body 1.

[0046] Piezoelectric ceramic plates 33 are installed on the glass plates 2 at the three locations: photodiode 200, light trap 300, and laser 100. These piezoelectric ceramic plates 33 are activated and deactivated synchronously. Due to the arrangement of the photodiode 200, light trap 300, and laser 100, dust particles will fall downwards when the glass plate 2 vibrates due to gravity and other factors. The cleaning component 6 will move to the bottom of the detection channel 13 to extract the dust. To prevent secondary dust fall onto the glass plate 2, a dust-guiding slope 35 is provided on the side of the silicone gasket 32 ​​facing the detection channel 13 to guide the dust downwards.

[0047] Reference Figure 5 and Figure 6 The cleaning component 6 includes a cleaning air column 61, a connecting air pipe 62, and a suction pump 63;

[0048] The air pump 63 is located inside the assembly cavity 171, and its air inlet 11 is connected to the cleaning air column 61 via the connecting air pipe 62. The air outlet of the air pump 63 is connected to the dust guide pipe 64, which communicates with the dust collection chamber 16. Several cleaning air columns 61 are arranged vertically, and several cleaning air columns 61 rise and fall together to perform the extraction work synchronously, thereby improving the dust extraction effect.

[0049] To increase the suction area of ​​the cleaning air column 61, an upper air hole 611 is provided at the top of the cleaning air column 61, and a side air hole 612 is provided on the side wall. Inside the cleaning air column 61, a main air hole 613 connects the upper air hole 611, the side air hole 612, and the connecting air pipe 62. When the cleaning air column 61 is located within the detection channel 13, the lower end of the side air hole 612 of the cleaning air column 61 is flush with the bottom end of the detection channel 13, so that the side air hole 612 can extract dust that has fallen to the bottom of the detection channel 13, further improving the dust extraction effect.

[0050] Reference Figure 1 and Figure 5 The drive assembly 7 includes a drive base 71 and a drive cylinder 72. The drive base 71 is vertically slidably mounted on the cavity wall of the assembly cavity 171. The air pump 63 and the cleaning air column 61 are both mounted on the drive base 71. The drive cylinder 72 is mounted on the machine body 1 and its output shaft is vertically arranged and connected to the drive base 71.

[0051] Reference Figure 5 and Figure 6 The concealed door 8 includes a door panel 81, a concealed hinge 82, and a sealing ring 83.

[0052] The upper surface of the door panel 81 is flush with the bottom of the detection channel 13. The door panel 81 includes a main board 811 and a secondary board 812 that are horizontally connected. A concealed hinge 82 is located between the main board 811 and the secondary board 812, thereby isolating the main board 811 and the secondary board 812. The concealed hinge 82 is horizontally arranged and rotatably mounted on the wall of the cleaning hole 18. The main board 811 is longer than the secondary board 812, and the main board 811 is located directly above the cleaning air column 61. Therefore, when the cleaning air column 61 moves upward, it can press against the main board 811 and push the main board 811 to rotate upward until the cleaning air column 61 moves into the detection channel 13.

[0053] In order to enable the door panel 81 to rotate within the cleaning hole 18 and ensure the sealing of the cleaning hole 18, the sealing ring 83 is fitted and installed against the hole wall of the cleaning hole 18 and abuts against the side wall of the door panel 81. Both side walls of the door panel 81 arranged along its own rotation direction are provided with abutting slope 813, and the abutting slope 813 is arranged inclined from top to bottom along the direction close to the concealed hinge 82.

[0054] When the cleaning air column 61 moves downward from the detection channel 13, the main board 811 will rotate downward because it is heavier than the sub-board 812. When the side of the main board 811 comes into contact with the inner wall of the sealing ring 83, the elastic deformation of the sealing ring 83 will control the main board 811 to stop rotating, and the bottom of the detection channel 13 will return to a flat state.

[0055] Reference Figure 1 The detection channel 13 includes a first airway 131, a second airway 132, and a third airway 133 that are horizontally interconnected. The mounting cavity 19 is connected to the second airway 132. The diameter of the first airway 131 and the third airway 133 gradually increases at the ends away from the second airway 132, thus forming a channel shape that is wide at both ends and narrow in the middle.

[0056] Since the detection device is a non-powered unit, the wide channels at both ends can accommodate more airflow. When the airflow flows towards the narrow middle section, the reduced cross-sectional area of ​​the channel naturally creates a "Venturi effect," increasing the flow velocity and decreasing the pressure as the fluid passes through the narrow channel. This accelerates and stabilizes the potentially turbulent airflow, preventing dust accumulation or disorderly dispersion caused by low-speed airflow. The narrow channel also constrains the airflow direction, forcing the airflow to carry dust along a fixed path through the detection area between the laser 100 and the photodiode 200, rather than allowing it to diffuse randomly. This ensures that more dust particles can accurately pass through the optical path, improving the effective detection rate. Both the laser 100 and the photodiode 200 are located in the second air channel 132, which can reduce interference through "focused detection range," making the scattered light signal clearer and more measurable.

[0057] Reference Figure 1 Air inlets 11 and outlets 15 are respectively provided on the two sides of the body 1. Air inlets 11 are connected to vertically arranged air intake channels 12, and first air passages 131 are connected to the bottom end of air intake channels 12. Air outlets 15 are connected to vertically arranged air outlet channels 14, and third air passages 133 are connected to the bottom end of air outlet channels 14.

[0058] The air intake channel 12, detection channel 13, and air outlet channel 14 form a "U"-shaped air passage. While non-powered equipment relies on natural airflow for sample introduction, excessively fast airflow or turbulent flow can cause dust to "rapidly sweep across the detection area," affecting the acquisition of scattered signals. The "U"-shaped design, however, can force the airflow to adjust its state through path misalignment.

[0059] After entering through the inlet channel 12, the airflow must first turn to enter the detection channel 13, and then turn to exit through the outlet channel 14. During these two turns, "local eddies" are generated, naturally reducing the flow velocity. With the flow velocity reduced, dust particles can pass through the laser beam path more smoothly, making the dust particles more evenly distributed within the detection section. This avoids "local dust accumulation" or "sparse dust in the detection section" caused by unidirectional airflow, ensuring the accuracy of each dust sample detected.

[0060] Large particles of impurities, due to their weight and strong inertia, cannot turn quickly after entering the air intake channel 12 and will settle at the corner, reducing the impact of large particles of impurities on the surface of optical components in the detection channel 13, reducing the probability of lens contamination, and reducing the frequency of equipment maintenance.

[0061] At the same time, external light or sunlight cannot directly enter the detection channel 13, thereby reducing stray light interference from the source.

[0062] In order to clean the corners connecting the intake passage 12 and the detection passage 13, and the exhaust passage 14 and the detection passage 13, refer to Figure 1 and Figure 5Dust collection plates 4 are slidably connected to the bottom of the air intake channel 12 and the air outlet channel 14. A sliding groove 172 is provided on the body 1, which is slidably connected to the dust collection plate 4 along the layout direction of the detection channel 13. The sliding groove 172 is connected to the assembly cavity 171. The sliding groove 172 and the assembly cavity 171 are collectively referred to as the cleaning cavity 17.

[0063] Among them, such as Figure 5 and Figure 7 As shown, a return spring 5 is connected between the dust collection plates 4. A slot for holding the return spring 5 is provided at the bottom of the drive base 71. A connecting groove 43 for connecting the return spring 5 is provided on the opposite side wall of the dust collection plates 4. The output rod position of the drive cylinder 72 is reserved at the connecting groove 43, so that the sliding of the dust collection plates 4 does not affect the lifting and lowering of the drive base 71. A return slope 41 is provided on the side of the dust collection plate 4 facing the drive base 71, which slides against the bottom of the drive base 71. A slope matching the return slope 41 is provided at the bottom of the drive base 71.

[0064] When the cleaning air column 61 is located in the assembly cavity 171, the return spring 5 extends, and the dust collection plate 4 is located in the air inlet channel 12 and the air outlet channel 14. The dust collection plate 4 is provided with a sealing slope 42 that abuts against the side wall of the air inlet channel 12 and the air outlet channel 14 to improve the sealing performance of the dust collection plate 4.

[0065] When the cleaning air column 61 rises into the detection channel 13, the reset spring 5 begins to contract, and the dust collection plate 4 slides into the sliding groove 172. At this time, both the air inlet channel 12 and the air outlet channel 14 are connected to the dust collection chamber 16. As the dust collection plate 4 slides, the bottom slopes of the first air passage 131 and the second air passage 132 can push the dust accumulated on the dust collection plate 4 into the dust collection chamber 16, thereby cleaning the dust collection plate 4.

[0066] The implementation principle of the non-powered light scattering method coal mine dust concentration detection device in this application embodiment is as follows: Before dust concentration detection, the vibration component 3 controls the glass plate 2 on the photodiode 200, laser 100, and light trap 300 to vibrate, shaking off the dust on the glass plate 2. At the same time, the drive component 7 drives the cleaning component 6 to move upward, and the cleaning air column 61 rises above the dark door 8 into the detection channel 13, starting to extract the dust floating in the detection channel 13. The extracted dust enters the dust collection chamber 16 through the dust guide pipe 64. At the same time, the reset spring 5 begins to contract, and the dust collection plate 4 slides into the sliding groove 172. The bottom slope of the first air channel 131 and the second air channel 132 can push the dust accumulated on the dust collection plate 4 into the dust collection chamber 16, thereby reducing the difficulty of cleaning the air path of the device. After that, the light scattering dust concentration detection is performed, which can ensure the accuracy of the dust concentration detection of the device.

[0067] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A non-powered light scattering method coal mine dust concentration detection device, comprising a body (1), wherein a detection channel (13) is provided inside the body (1), and mounting cavities (19) for mounting photodiodes (200), lasers (100) and light traps (300) are provided on the top and side walls of the detection channel (13), wherein the photodiodes (200) are located at the top of the detection channel (13), and the lasers (100) and light traps (300) are located on opposite sides of the detection channel (13), characterized in that, Also includes: A vibration assembly (3) is connected between the wall of the mounting cavity (19) and the glass plate (2), and the vibration assembly (3) is used to shake dust away from the glass plate (2). The cleaning component (6) is provided in the body (1) below the detection channel (13) for mounting the cleaning component (6). The bottom of the detection channel (13) is provided with a cleaning hole (18) for the cleaning component (6) to enter the detection channel (13). The cleaning component (6) is provided with a drive component (7) for lifting and lowering the cleaning component (6) below it. The top of the cleaning hole (18) is provided with a hidden door (8). The top of the hidden door (8) is flush with the bottom of the detection channel (13). The cleaning component (6) is used to absorb the dust in the detection channel (13) when the vibration component (3) is started. The body (1) is provided with a dust collection chamber (16) for collecting the dust extracted by the cleaning component (6).

2. The non-powered light scattering method coal mine dust concentration detection device according to claim 1, characterized in that: The vibration assembly (3) includes a mounting frame (31), a silicone gasket (32), and a piezoelectric ceramic sheet (33). The mounting frame (31) is installed on the cavity wall of the mounting cavity (19). The silicone gasket (32) is installed on the inner ring of the mounting frame (31) and has a slot for engaging with the glass sheet (2). The glass sheet (2) is pressed against the silicone gasket (32) and has a light-shielding area (21) near the inner surface of the silicone gasket (32). The piezoelectric ceramic sheet (33) is installed on the light-shielding area (21) of the glass sheet (2) by thermally conductive adhesive (34). Several piezoelectric ceramic sheets (33) are arranged around the corners of the glass sheet (2).

3. The non-powered light scattering method coal mine dust concentration detection device according to claim 1, characterized in that: The cleaning assembly (6) includes a cleaning air column (61), a connecting air pipe (62), and a vacuum pump (63). The air pump (63) is located in the assembly cavity (171) and the air inlet (11) is connected to the cleaning air column (61) through the connecting air pipe (62). The air outlet of the air pump (63) is connected to the dust guide pipe (64) which communicates with the dust collection chamber (16). The cleaning air column (61) is vertically arranged and there are several of them. The top of the several cleaning air columns (61) is provided with an upper air hole (611) and the side wall is provided with a side air hole (612). The interior of the cleaning air column (61) is provided with a total air hole (613) that connects the upper air hole (611), the side air hole (612) and the connecting air pipe (62).

4. The coal mine dust concentration detection device using the non-powered light scattering method according to claim 3, characterized in that: The drive assembly (7) includes a drive seat (71) and a drive cylinder (72). The drive seat (71) is vertically slidably installed on the cavity wall of the assembly cavity (171). The air pump (63) and the cleaning air column (61) are both installed on the drive seat (71). The drive cylinder (72) is installed on the machine body (1) and its output shaft is vertically arranged and connected to the drive seat (71).

5. The coal mine dust concentration detection device using the non-powered light scattering method according to claim 3, characterized in that: The concealed door (8) includes a door panel (81), a concealed hinge (82), and a sealing ring (83); The door panel (81) is rotatably mounted on the wall of the cleaning hole (18) via a concealed hinge (82). The sealing ring (83) is fitted and mounted on the wall of the cleaning hole (18) and abuts against the side wall of the door panel (81). The upper surface of the door panel (81) is flush with the bottom of the detection channel (13). Both side walls of the door panel (81) along its own rotation direction are provided with abutting slopes (813). The abutting slopes (813) are arranged from top to bottom along the direction close to the concealed hinge (82).

6. The coal mine dust concentration detection device using the non-powered light scattering method according to claim 5, characterized in that: The door panel (81) includes a main board (811) and a secondary board (812) that are horizontally connected to each other. The concealed hinge (82) is located between the main board (811) and the secondary board (812) to isolate them. The main board (811) is longer than the secondary board (812). The main board (811) is located directly above the cleaning air column (61).

7. The coal mine dust concentration detection device using the non-powered light scattering method according to claim 4, characterized in that: The detection channel (13) includes a first airway (131), a second airway (132) and a third airway (133) that are horizontally interconnected. The mounting cavity (19) is connected to the second airway (132). The diameter of the end of the first airway (131) and the third airway (133) that is away from the second airway (132) gradually increases.

8. The coal mine dust concentration detection device using the non-powered light scattering method according to claim 7, characterized in that: The body (1) has an air inlet (11) and an air outlet (15) on opposite sides. The air inlet (11) is connected to a vertically arranged air intake channel (12). The first air passage (131) is connected to the bottom end of the air intake channel (12). The air outlet (15) is connected to a vertically arranged air outlet channel (14). The third air passage (133) is connected to the bottom end of the air outlet channel (14).

9. The non-powered light scattering method coal mine dust concentration detection device according to claim 8, characterized in that: The bottom of the air intake channel (12) and the air outlet channel (14) are slidably connected to dust collection plates (4). The body (1) is provided with a sliding groove (172) that is slidably connected to the dust collection plates (4) along the layout direction of the detection channel (13). The sliding groove (172) is connected to the assembly cavity (171). The dust collection plates (4) are connected to each other with a return spring (5). The side of the dust collection plate (4) facing the drive seat (71) is provided with a return inclined surface (41) that slidably abuts against the drive seat (71). When the cleaning air column (61) is located in the detection channel (13), the reset spring (5) contracts, the dust collection plate (4) is located in the sliding groove (172), and the air inlet channel (12) and the air outlet channel (14) are both connected to the dust collection chamber (16).

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