A vehicle-mounted mobile road air quality detection device
By designing the lifting mechanism and folding mechanism in the vehicle-mounted road air quality detection device, the detection device has difficulty in detecting and passing through air in different heights, and convenient air quality detection and improvement of traffic performance have been achieved.
Patent Information
- Application Number
- CN202411756181.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-03
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2044-12-03
AI Technical Summary
Existing vehicle-mounted road air quality detection devices are difficult to detect in air of different heights, and there are difficulties in passing through tunnels, bridges and other areas.
A vehicle-mounted road air mass movement detection device is designed, adopting a lifting mechanism and an air intake mechanism, and the spur gear is driven to rotate through the first motor, and the movable block slides in the movable groove, and the limiting column limits the movement direction of the movable block, thereby adjusting the height of the air intake port. At the same time, through the folding mechanism, the motor drives the worm and worm gear transmission, thereby achieving folding of the upper and lower rods, adapting to detection and passage at different heights.
The detection of air at different heights is realized, which improves the convenience of detection and traffic performance, and avoids the impact on the vehicle body in low areas.
Smart Images

Figure CN119283778B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of air movement detection devices, in particular to a vehicle-mounted road air quality movement detection device. Background Art
[0002] Conventional air quality testing mostly relies on fixed monitoring stations to sample and test the air at fixed points. However, since fixed monitoring stations can only monitor the air quality of specific areas, it is difficult to fully reflect the air quality conditions of different roads and different areas in the city. On-board testing can use the mobility of vehicles to monitor the air quality on the driving route anytime and anywhere, forming a criss-crossing full-region mobile online monitoring "network", expanding the monitoring scope, and helping to achieve a comprehensive grasp of the "surface source" of air pollution, which is of great significance for accurately tracing the source of pollution and assisting environmental law enforcement.
[0003] However, when conducting vehicle-mounted road air quality testing, the air quality testing instrument is simply fixed on the environmental monitoring vehicle, making it difficult to perform air testing operations at different heights. In addition, when passing through areas with height restrictions such as tunnels and bridge holes, it may be necessary to stop the vehicle in advance and adjust the height of the testing device to improve passability and safety.
[0004] In order to facilitate the detection of air at different heights and improve the convenient traffic performance, a vehicle-mounted road air quality mobile detection device is provided. Summary of the invention
[0005] The purpose of the present invention is to provide a vehicle-mounted mobile road air quality detection device in order to facilitate the detection of air at different heights and to improve the convenient traffic performance.
[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a vehicle-mounted road air quality mobile detection device, comprising a base, an air detector is installed on the top of the base, an outer wall of the air detector is fixedly connected to an air intake pipe, an outer wall of the air intake pipe is installed with an air pump, an air inlet is arranged above the base, the height of the air inlet is adjusted by a lifting mechanism, the lifting mechanism comprises an upper rod and a lower rod, the upper rod is rotatably connected to the top of the lower rod, the lower rod is rotatably connected to the top of the base, the outer walls of the upper rod and the lower rod are provided with movable grooves, the inner walls of the movable grooves are fixedly connected with a middle An empty limit column, the limit column consists of an upper column and a lower column, the upper column is fixedly connected to the upper rod, the lower column is fixedly connected to the lower rod, the inner wall of the movable groove is slidably connected with a movable block, the top of the movable block is provided with a limit groove, a vertical plate is fixedly connected at the connection position between the inner wall of the movable block and the limit groove, the air inlet is fixedly connected to the outer wall of the movable block, the outer wall of the movable block is installed with a first motor, the output end of the first motor is connected with a spur gear, the upper rod and the lower rod are rotated by a folding mechanism, and the outside air enters the air detector through the air intake mechanism for detection.
[0007] As a further scheme of the present invention: the folding mechanism includes a first fixing rod, the first fixing rod is fixedly connected to the top of the base and extends into the interior of the lower rod, the outer wall of the first fixing rod is rotatably connected to the first worm gear fixedly connected to the lower rod, the bottom end of the upper rod is fixedly connected to the second fixing rod extending into the interior of the lower rod, the outer wall of the second fixing rod is fixedly connected to the second worm gear, the bottom end of the lower rod is fixedly connected to the second motor, the output end of the second motor is connected to the connecting shaft, the outer wall of the connecting shaft is fixedly connected to the first bevel gear, the interior of the lower rod is located at the outer wall of the first bevel gear and is rotatably connected to the second bevel gear, one end of the second bevel gear is fixedly connected to the first worm, the first worm contacts the first worm gear, the top of the connecting shaft is fixedly connected to the third bevel gear, the interior of the lower rod is located at the outer wall of the third bevel gear and is rotatably connected to the fourth bevel gear, one end of the fourth bevel gear is fixedly connected to the second worm, and the second worm contacts the second worm gear.
[0008] As a further solution of the present invention: the air intake mechanism includes air holes, and the number of the air holes is set to be several and is longitudinally equidistantly opened on the outer wall of the limiting column, the inner wall of the limiting column is located on one side of each of the air holes and is fixedly connected with at least two round rods, the outer wall of the round rod is slidably connected with a baffle, a spring is connected between the baffle and the limiting column, the outer wall of the baffle is fixedly connected with an extrusion block, the outer wall of the lower rod is fixedly connected with an arc tube, the top of the base is located on the outer wall of the arc tube and an arc groove is opened; the hollow cavity of the limiting column is connected with the arc tube, and the arc groove is connected with the air intake pipe.
[0009] As a further solution of the present invention: the inner wall of the movable groove fits with the outer wall of the movable block, and the inner wall of the limiting groove fits with the outer wall of the limiting column.
[0010] As a further solution of the present invention: a tooth groove is provided on an inner wall of one side of the movable groove, and the tooth groove is meshed with the spur gear.
[0011] As a further solution of the present invention: the first bevel gear is meshed with the second bevel gear, and the first worm is matched with the first worm wheel.
[0012] As a further solution of the present invention: the third bevel gear is meshed with the fourth bevel gear, and the second worm wheel is matched with the second worm.
[0013] As a further solution of the present invention: a groove for the second motor to move into is formed at the top of the base, and the groove is located below the lower rod.
[0014] As a further solution of the present invention: the outer wall of the arc-shaped tube is in contact with the inner wall of the arc-shaped groove.
[0015] Compared with the prior art, the present invention has the following beneficial effects:
[0016] 1. By setting up a lifting mechanism and an air intake mechanism, the operation of the first motor drives the spur gear to rotate, and the rotation of the spur gear drives the movable block to slide in the movable groove. At this time, the limit column located in the limit groove can limit the moving direction of the movable block. The displacement of the movable block drives the air inlet to move, thereby adjusting the height of the air inlet, which is convenient for sampling and detecting air at different heights.
[0017] 2. By setting up a folding mechanism, the second motor drives the connecting shaft to rotate, the connecting shaft drives the first worm to rotate, the first worm wheel drives the lower rod and the first worm wheel to rotate synchronously, thereby driving the lower rod to fold and rotate relative to the base; the connecting shaft rotates to drive the second worm to rotate, the second worm drives the upper rod and the second worm wheel to rotate, thereby realizing the simultaneous folding and rotation of the upper rod and the lower rod, which is convenient for folding the upper rod and the lower rod when no detection is performed or when passing through a low limit area, to prevent the upper rod and the lower rod from being too high and affecting the movement of the vehicle body. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a structural schematic diagram of the present invention;
[0019] Figure 2 It is a schematic diagram of the internal structure of the lower rod of the present invention;
[0020] Figure 3 It is a schematic diagram of the connection between the upper rod and the lower rod of the present invention;
[0021] Figure 4 It is a schematic diagram of the installation of the movable block of the present invention;
[0022] Figure 5 It is a schematic diagram of the internal structure of the movable block of the present invention;
[0023] Figure 6 It is a schematic diagram of the internal structure of the limiting column of the present invention;
[0024] Figure 7 It is a schematic diagram of the structure of the arc tube and the arc groove of the present invention.
[0025] In the figure: 1, base; 2, air detector; 3, air inlet pipe; 4, air pump; 5, air inlet; 6, lifting mechanism; 601, upper rod; 602, lower rod; 603, movable groove; 604, limiting column; 6041, upper column; 6042, lower column; 605, movable block; 606, limiting groove; 607, vertical plate; 608, first motor; 609, spur gear; 7, folding mechanism; 701, first fixed rod; 702, first worm gear; 703 , second fixed rod; 704, second worm gear; 705, second motor; 706, connecting shaft; 707, first bevel gear; 708, second bevel gear; 709, first worm; 710, third bevel gear; 711, fourth bevel gear; 712, second worm; 8, air intake mechanism; 801, vent; 802, round rod; 803, baffle; 804, spring; 805, extrusion block; 806, arc tube; 807, arc groove; 9, groove. DETAILED DESCRIPTION
[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0027] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following is an explanation of its embodiments based on the overall structure of the present invention.
[0028] See also Figures 1 to 7In an embodiment of the present invention, a vehicle-mounted road air quality mobile detection device includes a base 1, an air detector 2 is installed on the top of the base 1, an air intake pipe 3 is fixedly connected to the outer wall of the air detector 2, an air pump 4 is installed on the outer wall of the air intake pipe 3, an air inlet 5 is arranged above the base 1, and the height of the air inlet 5 is adjusted by a lifting mechanism 6, the lifting mechanism 6 includes an upper rod 601 and a lower rod 602, the upper rod 601 is rotatably connected to the top of the lower rod 602, the lower rod 602 is rotatably connected to the top of the base 1, and the outer walls of the upper rod 601 and the lower rod 602 are provided with movable grooves 603, and the inner wall of the movable groove 603 is fixedly connected with a hollow limiting column 604, and the limiting column 604 is composed of an upper column 6041 and a lower column 6042. The upper column 6041 is fixedly connected to the upper rod 601, the lower column 6042 is fixedly connected to the lower rod 602, the inner wall of the movable groove 603 is slidably connected with a movable block 605, a limiting groove 606 is provided at the top of the movable block 605, a vertical plate 607 is fixedly connected at the connection position between the inner wall of the movable block 605 and the limiting groove 606, the air inlet 5 is fixedly connected to the outer wall of the movable block 605, the outer wall of the movable block 605 is installed with a first motor 608, the output end of the first motor 608 is connected with a spur gear 609, the upper rod 601 and the lower rod 602 are rotated by the folding mechanism 7, and the outside air enters the air detector 2 through the air intake mechanism 8 for detection, and the detection result can be sent back to the mobile phone or computer controller terminal in the form of wireless transmission.
[0029] In this embodiment: the base 1 is installed on the top of the vehicle body by a conventional fixing method such as magnetic attraction, bolt fixing or welding. When adjusting the height of the air inlet 5, the first motor 608 is started, and the operation of the first motor 608 drives the spur gear 609 to rotate, and the rotation of the spur gear 609 drives the movable block 605 to slide in the movable groove 603. At this time, the limiting column 604 located in the limiting groove 606 can limit the moving direction of the movable block 605, and the displacement of the movable block 605 drives the air inlet 5 to move, thereby adjusting the height of the air inlet 5.
[0030] Please refer to Figures 2 to 3The folding mechanism 7 includes a first fixing rod 701, which is fixedly connected to the top of the base 1 and extends to the inside of the lower rod 602. The outer wall of the first fixing rod 701 is rotatably connected to a first worm gear 702 fixedly connected to the lower rod 602. The bottom end of the upper rod 601 is fixedly connected to a second fixing rod 703 extending into the inside of the lower rod 602. The outer wall of the second fixing rod 703 is fixedly connected to a second worm gear 704. The bottom end of the lower rod 602 is fixedly connected to a second motor 705. The output end of the second motor 705 is connected to a connecting shaft 706. The outer wall of the connecting shaft 706 is fixedly connected to the second motor 705. The wall is fixedly connected with a first bevel gear 707, the interior of the lower rod 602 is located at the outer wall of the first bevel gear 707 and is rotatably connected with a second bevel gear 708, one end of the second bevel gear 708 is fixedly connected with a first worm gear 709, the first worm gear 709 is in contact with the first worm gear 702, the top of the connecting shaft 706 is fixedly connected with a third bevel gear 710, the interior of the lower rod 602 is located at the outer wall of the third bevel gear 710 and is rotatably connected with a fourth bevel gear 711, one end of the fourth bevel gear 711 is fixedly connected with a second worm gear 712, and the second worm gear 712 is in contact with the second worm gear 704.
[0031] In this embodiment: when no detection is performed, the second motor 705 can be started, and the second motor 705 drives the connecting shaft 706 to rotate, the connecting shaft 706 rotates to drive the first bevel gear 707 to rotate, the first bevel gear 707 rotates to drive the second bevel gear 708 to rotate, the second bevel gear 708 rotates to drive the first worm 709 to rotate, the first worm 709 rotates to drive the first worm wheel 702 to rotate, the first worm wheel 702 rotates to drive the lower rod 602 and the first worm wheel 702 to rotate, thereby driving the lower rod 602 to rotate relative to the base 1. The connecting shaft 706 rotates to drive the third bevel gear 710 to rotate, the third bevel gear 710 rotates to drive the fourth bevel gear 711 to rotate, the fourth bevel gear 711 rotates to drive the second worm 712 to rotate, the second worm 712 rotates to drive the upper rod 601 and the second worm wheel 704 to rotate relative to the lower rod 602, thereby driving the upper rod 601 and the lower rod 602 to rotate relative to each other at the same time. This design facilitates the folding operation of the upper rod 601 and the lower rod 602 when no detection is performed, thereby preventing the upper rod 601 and the lower rod 602 from being too high and affecting the movement of the vehicle body.
[0032] It should be pointed out that by adjusting the transmission ratio of the worm gear, the rotation speed of the upper rod 601 is made significantly faster than the rotation speed of the lower rod 602 (the rotation angular velocity of the upper rod 601 is at least twice as fast as the rotation angular velocity of the lower rod 602), thereby preventing the upper rod 601 from rotating too slowly and interfering with the roof.
[0033] Please refer to Figure 6 to Figure 7The air intake mechanism 8 includes a vent 801, and the number of the vents 801 is set to be several and is longitudinally equidistantly opened on the outer wall of the limiting column 604, the inner wall of the limiting column 604 is located on one side of each of the vents 801 and is fixedly connected with at least two round rods 802, the outer wall of the round rod 802 is slidably connected with a baffle 803, a spring 804 is connected between the baffle 803 and the limiting column 604, the outer wall of the baffle 803 is fixedly connected with an extrusion block 805, the outer wall of the lower rod 602 is fixedly connected with an arc tube 806, and the top of the base 1 is located on the outer wall of the arc tube 806 and is provided with an arc groove 807; the hollow cavity of the limiting column 604 is connected with the arc tube 806, and the arc groove 807 is connected with the air intake pipe 3.
[0034] In this embodiment: during the movement of the movable block 605, when the vent hole 801 enters the limiting groove 606, the extrusion block 805 contacts the vertical plate 607, pushing the extrusion block 805 to move. The movement of the extrusion block 805 drives the baffle 803 to move, causing the spring 804 to be squeezed, opening the vent hole 801, starting the air pump 4, and allowing the outside air to enter the movable block 605 through the air inlet 5, and then enter the limiting column 604 through the vent hole 801, and then enter the air inlet pipe 3 through the arc tube 806 and the arc groove 807, and finally enter the air detector 2 for detection operation.
[0035] Please refer to Figures 1 to 5 The inner wall of the movable groove 603 fits with the outer wall of the movable block 605 , and the inner wall of the limiting groove 606 fits with the outer wall of the limiting column 604 .
[0036] In this embodiment, the operation of the first motor 608 drives the spur gear 609 to rotate, and the rotation of the spur gear 609 drives the movable block 605 to slide in the movable groove 603 .
[0037] Please refer to Figures 1 to 5 A tooth groove is provided on the inner wall of one side of the movable groove 603 , and the tooth groove is meshed with the spur gear 609 .
[0038] In this embodiment, the spur gear 609 rotates to drive the movable block 605 to slide in the movable groove 603. At this time, the limiting column 604 located in the limiting groove 606 can limit the moving direction of the movable block 605, and the displacement of the vertical plate 607 drives the air inlet 5 to move.
[0039] Please refer to Figures 2 to 3 The first bevel gear 707 is meshed with the second bevel gear 708 , and the first worm 709 is matched with the first worm wheel 702 .
[0040] In this embodiment: the operation of the second motor 705 drives the connecting shaft 706 to rotate, the rotation of the connecting shaft 706 drives the first bevel gear 707 to rotate, the rotation of the first bevel gear 707 drives the second bevel gear 708 to rotate, the rotation of the second bevel gear 708 drives the first worm 709 to rotate, the rotation of the first worm 709 drives the first worm wheel 702 to rotate, the rotation of the first worm wheel 702 drives the lower rod 602 and the first worm wheel 702 to rotate, thereby driving the lower rod 602 to rotate relative to the base 1.
[0041] Please refer to Figures 2 to 3 The third bevel gear 710 is meshed with the fourth bevel gear 711 , the second worm gear 704 is matched with the second worm 712 , and a groove 9 for the second motor 705 to move into is provided at the top of the base 1 , and the groove 9 is located below the lower rod 602 .
[0042] In this embodiment: the connection shaft 706 rotates to drive the third bevel gear 710 to rotate, the third bevel gear 710 rotates to drive the fourth bevel gear 711 to rotate, the fourth bevel gear 711 rotates to drive the second worm 712 to rotate, the second worm 712 rotates to drive the upper rod 601 and the second worm gear 704 to rotate.
[0043] Please refer to Figure 6 to Figure 7 The outer wall of the arc tube 806 fits with the inner wall of the arc groove 807 .
[0044] In this embodiment, when the lower rod 602 rotates relative to the base 1 , the arc tube 806 slides in the arc groove 807 .
[0045] In this embodiment: What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, can make equivalent replacements or changes based on the technical scheme and inventive concept of the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A vehicle-mounted road air quality mobile detection device, comprising a base (1), characterized in that: An air detector (2) is installed at the top of the base (1); an air inlet pipe (3) is fixedly connected to the outer wall of the air detector (2); an air pump (4) is installed on the outer wall of the air inlet pipe (3); an air inlet port (5) is arranged above the base (1); the height of the air inlet port (5) is adjusted by a lifting mechanism (6); the lifting mechanism (6) comprises an upper rod (601) and a lower rod (602); the upper rod (601) is rotatably connected to the top of the lower rod (602); the lower rod (602) is rotatably connected to the top of the base (1); movable grooves (603) are provided on the outer walls of the upper rod (601) and the lower rod (602); a hollow limiting column (604) is fixedly connected to the inner wall of the movable groove (603); the limiting column (604) is composed of an upper column (6041) and a lower column (6042); The upper column (6041) is fixedly connected to the upper rod (601), the lower column (6042) is fixedly connected to the lower rod (602), the inner wall of the movable groove (603) is slidably connected to a movable block (605), a limit groove (606) is provided at the top of the movable block (605), a vertical plate (607) is fixedly connected at the position where the inner wall of the movable block (605) and the limit groove (606) meet, the air inlet (5) is fixedly connected to the outer wall of the movable block (605), a first motor (608) is installed on the outer wall of the movable block (605), and a spur gear (609) is connected to the output end of the first motor (608), the upper rod (601) and the lower rod (602) are rotated by a folding mechanism (7), and external air enters the air detector (2) through an air intake mechanism (8) for detection.
2. A vehicle-mounted road air quality mobile detection device according to claim 1, characterized in that: The folding mechanism (7) comprises a first fixing rod (701), the first fixing rod (701) being fixedly connected to the top end of the base (1) and extending into the interior of the lower rod (602), the outer wall of the first fixing rod (701) being rotatably connected to a first worm gear (702) fixedly connected to the lower rod (602), the bottom end of the upper rod (601) being fixedly connected to a second fixing rod (703) extending into the interior of the lower rod (602), the outer wall of the second fixing rod (703) being fixedly connected to a second worm gear (704), the bottom end of the lower rod (602) being fixedly connected to a second motor (705), the output end of the second motor (705) being connected to a connecting shaft (706), the outer wall of the connecting shaft (706) being fixedly connected to the output end of the second motor (705), A first bevel gear (707) is fixedly connected to the wall of the lower rod (602); the interior of the lower rod (602) is located on the outer wall of the first bevel gear (707) and is rotatably connected to the second bevel gear (708); one end of the second bevel gear (708) is fixedly connected to the first worm gear (709); the first worm gear (709) is in contact with the first worm gear (702); the top end of the connecting shaft (706) is fixedly connected to the third bevel gear (710); the interior of the lower rod (602) is located on the outer wall of the third bevel gear (710) and is rotatably connected to the fourth bevel gear (711); one end of the fourth bevel gear (711) is fixedly connected to the second worm gear (712); the second worm gear (712) is in contact with the second worm gear (704).
3. A vehicle-mounted road air quality mobile detection device according to claim 2, characterized in that: The air intake mechanism (8) comprises a plurality of vent holes (801), which are longitudinally equidistantly arranged on the outer wall of the limiting column (604); the inner wall of the limiting column (604) is located on one side of each vent hole (801) and is fixedly connected to at least two round rods (802); the outer wall of the round rod (802) is slidably connected to a baffle (803); the baffle (803) and the limiting column (604) are slidably connected to each other. A spring (804) is connected between the two ends of the baffle plate (803); an extrusion block (805) is fixedly connected to the outer wall of the baffle plate (803); an arc-shaped tube (806) is fixedly connected to the outer wall of the lower rod (602); a top end of the base (1) is located on the outer wall of the arc-shaped tube (806) and an arc-shaped groove (807) is provided; the hollow cavity of the limiting column (604) is connected to the arc-shaped tube (806), and the arc-shaped groove (807) is connected to the air inlet pipe (3).
4. The vehicle-mounted road air quality mobile detection device according to claim 1, characterized in that: The inner wall of the movable groove (603) fits with the outer wall of the movable block (605), and the inner wall of the limiting groove (606) fits with the outer wall of the limiting column (604).
5. The vehicle-mounted road air quality mobile detection device according to claim 1, characterized in that: A tooth groove is provided on an inner wall of one side of the movable groove (603), and the tooth groove meshes with the spur gear (609).
6. The vehicle-mounted road air quality mobile detection device according to claim 2, characterized in that: The first bevel gear (707) is meshed with the second bevel gear (708), and the first worm (709) is matched with the first worm wheel (702).
7. The vehicle-mounted road air quality mobile detection device according to claim 2, characterized in that: The third bevel gear (710) meshes with the fourth bevel gear (711), and the second worm wheel (704) matches with the second worm (712).
8. The vehicle-mounted road air quality mobile detection device according to claim 2, characterized in that: The top of the base (1) is provided with a groove (9) for the second motor (705) to move into, and the groove (9) is located below the lower rod (602).
9. The vehicle-mounted road air quality mobile detection device according to claim 3, characterized in that: The outer wall of the arc-shaped tube (806) fits in with the inner wall of the arc-shaped groove (807).
Citation Information
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Air quality detection device
CN116242670A
Portable gas detection device
CN215297299U