Air quality detection device and use method thereof

Abstract

The invention relates to an air quality detection device applied to the field of air detection.The air quality detection device comprises an outer shell, the space in the outer shell is divided into a first cavity and a second cavity through an isolation frame installed on a bottom plate frame, a filtering and cleaning unit is arranged on one side of the isolation frame, and the filtering and cleaning unit comprises a scraping frame; a filter plate is embedded in the scraping frame, a restraining frame groove is formed in the back face of the filter plate, a vibrator is installed on the surface of the restraining frame groove, a driving adjusting unit is installed in the second cavity and comprises a driving motor, the output end of the driving motor is connected with a reciprocating lead screw, and the surface of the reciprocating lead screw is sleeved with a moving frame in a threaded mode; the surface of the movable frame is connected with a push rod, the scraping frame is driven by the reciprocating lead screw to horizontally move and turn over, self-cleaning of the filter plate, scraping of the inner wall of the cavity and synchronous cleaning of the protective door plate are achieved, and an integrated dust removal detection system is formed by combining the vibration shaking-off dust removal design.

Description

Technical Field

[0001] The present invention relates to an air detection device, and in particular to an air quality detection device applied in the field of air detection and a use method thereof. Background Art

[0002] Chinese invention patent CN118209688B discloses an energy-saving environmental monitoring device. When testing air quality, this invention first backflushes and then tests, ensuring the accuracy of real-time monitoring data. Samples at corresponding locations can be automatically saved to facilitate subsequent further testing, and monitoring data can be obtained efficiently and accurately.

[0003] Chinese invention patent CN119001013B discloses a building air quality detection device that uses a dust cleaning support arm to rotate and clean the dust on the outer side of the air filter head, clean the components and the dust cover, prevent impurities accumulated inside the detection box from excessively affecting the quality of detection, and greatly improve the efficiency and accuracy of detection.

[0004] When existing air detection devices are working, they generally use backblowing or scraping operations to clean the filter plate of the detection device. However, during backblowing, the dust remaining in the detection chamber may adhere to the inner wall and not be cleaned properly, affecting the quality of the next round of detection. During scraping, because the filter plate is designed before the dust detection program, some dust will be intercepted by the filter plate, resulting in a decrease in dust detection data, which will also affect the reliability of the detection results. Summary of the Invention

[0005] In view of the above-mentioned existing technologies, the technical problem to be solved by the present invention is that it is difficult for traditional air quality detection devices to thoroughly clean the residual dust on the filter plate, the inner wall of the cavity and the protective door panel after dust filtration, resulting in inaccurate detection data and cumbersome maintenance.

[0006] To solve the above problems, the present invention provides an air quality detection device, comprising an outer shell mounted on a base frame, wherein the base frame is provided with a through groove inside, a protective door plate is mounted on one side surface of the outer shell via an axis frame, the space inside the outer shell is divided into a first cavity and a second cavity by an isolation frame mounted on the base frame, a filter cleaning unit is arranged on a side of the isolation frame close to the protective door plate, the filter cleaning unit comprises a scraping frame that is slidably fitted in the first cavity, a filter plate is embedded in the scraping frame, a constraint frame groove with a cross-shaped inner cross-section is mounted on the back of the filter plate, and a vibrator is mounted on the surface of the constraint frame groove; The second cavity is internally provided with a driving adjusting unit for adjusting the moving state of the filtering and cleaning unit, and the driving adjusting unit comprises a driving motor, the output end of the driving motor is connected with a reciprocating screw rod, the reciprocating screw rod is threadedly sleeved with a moving frame on the surface, the moving frame is connected with a push rod on the surface, and the tail end of the push rod is hinged with a sliding block installed in the slot of the constraint frame through a movable ball.

[0007] In the air quality detection device, the reciprocating screw rod drives the scraping frame to translate and overturn, the filter plate is self-cleaned, the cavity inner wall is scraped, and the protective door plate is synchronously cleaned, dust is shaken off and removed through vibration, and an integrated dust removal and detection system is formed.

[0008] As a further improvement of the present application, a dust sensor is embedded on the surface of the filter plate, an air quality sensor is installed in the second cavity, and a suction fan box located in the second cavity is installed on the inner top wall of the shell.

[0009] As a further improvement of the present application, the driving motor is connected with the inner wall of the shell through a lifting support, the length of the constraint frame slot is less than the height of the filter plate, the protective door plate and the shell have a magnetic attraction, an exhaust pipe with a built-in one-way valve is installed on the side of the shell away from the protective door plate, and an air inlet is arranged in the protective door plate.

[0010] As a further improvement of the present application, a rectangular through slot is arranged in the isolation frame, and the cross-sectional area of the through slot is not greater than the cross-sectional area of the filter plate.

[0011] As a further improvement of the present application, a moving slot with one end penetrating is arranged in the first cavity, a moving block is slidably connected in the moving slot, an auxiliary slot with a length less than that of the moving slot is arranged on the top of the moving slot, an auxiliary block matched with the auxiliary slot is installed on the top of the moving block, a flow guide slope is arranged on the top of the moving block, and a self-resetting shaft rod traversing the inside of the scraping frame is rotatably connected to the surface of the moving block.

[0012] As a further improvement of the present application, the installation position of the self-resetting shaft rod has a gap with the surface of the moving block away from the flow guide slope, and when the self-resetting shaft rod is displaced to the inside of the through slot, the auxiliary block is displaced to the end of the auxiliary slot close to the protective door plate.

[0013] As another improvement of the present application, a pushing baffle is installed through the inside of the first cavity, two electric push rods are installed in the second cavity through a suspension bracket, the power end of the electric push rod is connected with the surface of the pushing baffle, the pushing baffle extends to the inside of the second cavity through the inside of the isolation frame, and the pushing baffle is located outside the moving slot.

[0014] As a further supplement to the present application, the inside of the pushing baffle is provided with a groove, a spring member and an electromagnetic member are installed in the inside of the groove, the tail end of the spring member is connected with a supplementary baffle with a length less than that of the pushing baffle, the length of the supplementary baffle is not less than that of the filter plate, and a magnetic attraction layer is arranged on the surface of the supplementary baffle and is mutually attracted by the electromagnetic member.

[0015] A method for using an air quality detection device, the working steps are as follows: S1, when detecting the air quality, start the suction fan box, so that the air outside the shell body enters the first cavity through the air inlet, after preliminary detection by the dust sensor and interception by the filter plate, the gas is transferred to the second cavity, the air quality sensor detects the gas data in the gas, and then the gas is unidirectionally discharged through the exhaust pipe on the surface of the shell body; S2, after a round of detection, start the driving motor to drive the moving frame and the push rod to move towards the protective door plate, so that the scraping frame moves horizontally in the first cavity while scraping and cleaning the residual dust adhered to the inner wall of the first cavity; S3, when the filter plate moves to be attached to the surface of the protective door plate, the moving frame continues to move, under the cooperation of the continuous pushing action and the self-resetting shaft, the filter plate starts to tilt and pushes the protective door plate attached thereto to start clockwise movement, in this process, as the filter plate continues to rotate, the upper region of the scraping frame scrapes and cleans the inner surface of the protective door plate; S4, after the filter plate tilts and moves downward to the position where the protective door plate is close to the tail end, the cooperation of the pushing baffle and the electric push rod closes the sector-shaped gap formed by the protective door plate and the shell body, then the vibrator is started to vibrate and clean the dust on the surface of the filter plate and the scraping frame, then under the action of the reciprocating screw, the moving frame and the push rod are returned, thereby driving the filter plate and the scraping frame to restore to the vertical placement state and then move horizontally to reset, and the pushing baffle is recycled and reset, and the protective door plate also closes the shell body under the action of gravity and magnetic attraction.

[0016] In summary, when the driving motor drives the reciprocating screw to move, the scraping frame is first horizontally moved to scrape the inner wall of the cavity of the first cavity, and then the filter plate is tilted and turned over to synchronously scrape and clean the dust attached to the inner side of the protective door plate, covering the dead angle area that the traditional scheme cannot take into account. The introduction of the vibrator further shakes off the deep particles of the filter plate, and the combined design of the supplementary baffle and the pushing baffle dynamically closes the fan-shaped gap formed by the first cavity and the protective door plate in the turning and cleaning stage, avoiding the secondary pollution of dust caused by vibration and shaking off in the dust removal process. Then, the filter plate and the scraping frame are reset by the reciprocating screw, and the protective door plate realizes closed-loop control through the cooperation of the self-resetting shaft and the magnetic protective door, which not only ensures the thoroughness of cleaning, but also maintains the sealing of the detection cavity. Compared with the traditional back blowing or fixed scraper, the present application integrates the functions of filtering, scraping, vibration and sealing in a single transmission system, reduces the need for manual intervention, is especially suitable for long-term stable monitoring in high-dust environments, and at the same time avoids the energy consumption problem of complex gas circuits or high-pressure systems. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the first embodiment of the present application; Figure 2 It is a schematic diagram of the structure inside the outer shell of the first and second embodiments of the present application; Figure 3 It is an enlarged schematic diagram of A in the first embodiment of the present application; Figure 2 Figure 4 It is a schematic diagram of the installation of the filter cleaning unit and the vibrator of the first embodiment of the present application; Figure 5 It is a schematic diagram of the moving groove, the moving block and the flow guide slope of the first and second embodiments of the present application; Figure 6 It is a schematic diagram of the filter cleaning unit of the first embodiment of the present application horizontally moving to scrape and clean the inner wall of the first cavity; Figure 7 It is a schematic diagram of the filter cleaning unit of the first embodiment of the present application tilting and scraping the residual dust on the inner side of the protective door plate; Figure 8 It is a schematic diagram of the overall process of the filter cleaning unit of the first embodiment of the present application cleaning the inner wall of the first cavity and the protective door plate; Figure 9 It is a schematic diagram of the installation of the electric push rod and the pushing baffle of the second embodiment of the present application; Figure 10 It is a top view of the pushing baffle of the second embodiment of the present application; Figure 11 It is a working state diagram of the pushing baffle and the supplementary baffle of the second embodiment of the present application.

[0018] ​Explanation of reference numerals in the drawings: 1, outer shell; 2, bottom plate frame; 3, protective door plate; 4, filter cleaning unit; 41, scraping frame; 42, filter plate; 43, constraint frame slot; 5, dust sensor; 6, driving adjustment unit; 61, driving motor; 62, reciprocating screw; 63, push rod; 7, air quality sensor; 8, vibrator; 201, isolation frame; 202, moving groove; 203, moving block; 2031, guide slope; 101, suction fan box; 9, electric push rod; 10, push baffle; 11, electromagnetic component; 12, spring component; 13, supplementary baffle. DETAILED DESCRIPTION

[0019] The three embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0020] First embodiment: Figures 1-8 An air quality detection device is shown, which comprises an outer shell 1 mounted on a bottom plate frame 2, and the inside of the bottom plate frame 2 is provided with a through groove, and the side surface of the outer shell 1 is provided with a protective door plate 3 mounted through a shaft support, and the space inside the outer shell 1 is divided into a first cavity and a second cavity by an isolation frame 201 mounted on the bottom plate frame 2, and the side of the isolation frame 201 close to the protective door plate 3 is provided with a filter cleaning unit 4, and the filter cleaning unit 4 comprises a scraping frame 41 which is slidably fitted in the first cavity, and the inside of the scraping frame 41 is inlaidly mounted with a filter plate 42, and the back surface of the filter plate 42 is mounted with a constraint frame slot 43 with a cross-section, and the surface of the constraint frame slot 43 is mounted with a vibrator 8. The inside of the second cavity is mounted with a driving adjustment unit 6 for adjusting the moving state of the filter cleaning unit 4, and the driving adjustment unit 6 comprises a driving motor 61, and the output end of the driving motor 61 is connected with a reciprocating screw 62, and the surface of the reciprocating screw 62 is threadedly sleeved with a moving frame, and the surface of the moving frame is connected with a push rod 63, and the tail end of the push rod 63 is hingedly connected with a sliding block mounted in the constraint frame slot 43 through a movable ball.

[0021] The surface of the filter plate 42 is inlaidly mounted with a dust sensor 5, the inside of the second cavity is mounted with an air quality sensor 7, and the inner top wall of the outer shell 1 is mounted with a suction fan box 101 located in the second cavity, and when the moving frame moves to the end of the reciprocating screw 62 close to the protective door plate 3, the sliding block moves to the top end position in the constraint frame slot 43.

[0022] The driving motor 61 is connected with the inner wall of the outer shell 1 through a lifting support, the length value of the constraint frame slot 43 is less than the height value of the filter plate 42, the protective door plate 3 has a magnetic attraction action with the outer shell 1, the side of the outer shell 1 away from the protective door plate 3 is mounted with an exhaust pipe with a built-in one-way valve, and the inside of the protective door plate 3 is provided with an air inlet.

[0023] The inside of the isolation frame 201 is provided with a rectangular through slot, and the cross-sectional area of the through slot is not greater than the cross-sectional area of the filter plate 42, and the tail end of the reciprocating lead screw 62 has a horizontal gap with the surface of the isolation frame 201.

[0024] Specifically, the upper and lower parts of the constraint frame slot 43 are solid structures, and the middle part is a sliding groove design, and the vibrator 8 is installed in the solid area.

[0025] Before air quality detection, the protective door plate 3 and the outer shell 1 are kept closed due to the magnetic attraction between them, and the exhaust pipe is a one-way air passage. In addition, a control valve is installed inside the air inlet, which is only opened during operation, which can reduce the interference of external gas and dust on the internal detection work.

[0026] During the detection operation, the control valve and the suction fan box 101 are started, the inside of the outer shell 1 generates a suction effect, so that the external gas enters the inside of the first cavity through the air inlet. After the gas enters the first cavity, the dust sensor 5 detects the related data of dust and other particulate matter. Under the action of suction, dust and other particulate matter are intercepted on the inner wall surface of the filter plate 42, the inner wall surface of the first cavity and the inner surface of the protective door plate 3. Other gases enter the inside of the second cavity and are detected by the air quality sensor 7. After that, the gas is discharged from the inside of the outer shell 1 through the exhaust pipe in one direction, and the detection work is completed.

[0027] After the detection is completed, the suction fan box 101 is closed and the suction operation is stopped, and then the driving motor 61 is started to drive the reciprocating lead screw 62 to rotate. In the process of rotating the reciprocating lead screw 62, the moving frame moves horizontally to the left (that is, close to the protective door plate 3, hereinafter referred to as left), at this time the moving frame drives the push rod 63 to move left, so that the scraping frame 41 and the filter plate 42 move left synchronously. In the process of moving left, the edge surface of the scraping frame 41 can scrape the surfaces of the four inner walls of the first cavity (as shown in Figure 6 When the moving block 203 moves to the left end of the moving groove 202, the filter plate 42 and the through groove are in the same vertical plane (because the reset shaft is installed at a position close to the left end of the surface of the moving block 203), and the filter plate 42 is continuously pushed to move left at this time. At this time, the moving block 203 continues to move left with the filter plate 42 (at this time, the auxiliary block has not reached the end of the auxiliary groove), which will make the filter plate 42 protrude from the inside of the first cavity. At this time, the auxiliary block has moved to the left end position of the auxiliary groove, limiting the horizontal left movement of the moving block 203 and the filter plate 42, and cutting off the magnetic attraction, so that the protective door plate 3 and the outer shell 1 are in a separated state.

[0028] When the moving block 203 moves to the left end of the moving groove 202, the moving frame has not moved to the end of the reciprocating lead screw 62. At this time, with the rotation of the reciprocating lead screw 62, the moving frame continues to drive the push rod 63 to move left. Under the cooperation of the pushing action and the self-resetting shaft, the filter plate 42 and the scraping frame 41 gradually rotate counterclockwise around the self-resetting shaft. In this process, the upper part of the scraping frame 41 will scrape the inner surface of the protective door plate 3 (as shown in Figure 7 illustrated). Until the scraping frame 41 moves to a position close to the tail end of the protective door plate 3 (because the height of the protective door plate 3 is greater than the height of the corresponding notch of the shell body 1, the residual dust in the corresponding area of the first cavity can be completely scraped when the scraping frame 41 moves to a position close to the tail end, and the scraping frame 41 can always be located below the protective door plate 3 to facilitate subsequent resetting), a more complete scraping and cleaning effect is achieved on the inner surface of the protective door plate 3.

[0029] During the above period, the sliding block gradually moves upward along the inside of the constraint frame groove 43 (that is, the sliding groove area) from the initial state of being located at the lower end of the constraint frame groove 43 to ensure smooth operation of the pushing and deflecting operation.

[0030] Then start the vibrator 8, and stop the rotation of the driving motor 61 during this period to provide some free time for vibration cleaning. The residual dust on the filter plate 42 and the scraping frame 41 and the surface of the protective door plate 3 is shaken off and cleaned to be smoothly discharged from the inside of the shell body 1.

[0031] Finally, restart the driving motor 61 to move the moving frame to the right. At this time, the inclined filter cleaning unit 4 is gradually restored to the vertical placement state. With the restoration of the filter cleaning unit 4 to the vertical state and the right resetting movement, the originally separated protective door plate 3 can reseal the shell body 1 under the action of gravity and magnetic attraction.

[0032] The inside of the first cavity is provided with a moving groove 202 with one end penetrating through. The moving block 203 is slidably connected in the moving groove 202. The top of the moving groove 202 is provided with an auxiliary groove with a length value less than that of the moving groove 202. The top of the moving block 203 is provided with an auxiliary block matched with the auxiliary groove. The surface of the moving block 203 is provided with a flow guide slope 2031. The surface of the moving block 203 is rotatably connected with a self-resetting shaft transversely penetrating through the inside of the scraping frame 41.

[0033] The installation position of the self-resetting shaft is spaced apart from the side surface of the moving block 203 away from the flow guide slope 2031. When the self-resetting shaft is displaced to the inside of the through groove, the auxiliary block is displaced to the end of the auxiliary groove close to the protective door plate 3.

[0034] Specifically, when the filter cleaning unit 4 moves to the left to clean the residual dust in the first cavity, the moving block 203 also pushes and cleans the residual dust in the moving groove 202, the auxiliary block cleans the residual dust in the auxiliary groove, and the auxiliary block pushes the dust to the flow guide slope surface 2031, and finally falls into the moving groove 202, and then pushes out of the inside of the moving groove 202 in the subsequent moving process.

[0035] Second embodiment: Figure 2 、 Figure 5 and Figures 9-11 The inside of the first cavity is provided with a push baffle 10, the inside of the second cavity is provided with two electric push rods 9 through a hanging plate frame, the power end of the electric push rod 9 is connected with the surface of the push baffle 10, the push baffle 10 extends through the inside of the isolation frame 201 to the inside of the second cavity, and the push baffle 10 is located outside the moving groove 202.

[0036] The inside of the push baffle 10 is provided with a groove, the inside of the groove is provided with a spring member 12 and an electromagnetic member 11, the tail end of the spring member 12 is connected with a supplementary baffle 13 with a length less than that of the push baffle 10, the length of the supplementary baffle 13 is not less than that of the filter plate 42, and the surface of the supplementary baffle 13 is provided with a magnetic attraction layer which is mutually attracted by the electromagnetic member 11.

[0037] Different from the first embodiment, in the first embodiment, after the protective door plate 3 is lifted and the filter plate 42 is counterclockwise deflected, a fan-shaped gap is formed between the outer shell 1 and the outside, and in the subsequent process of vibrating and shaking to clean the dust, the suspended and diffused dust may re-enter the inside of the outer shell 1 through the fan-shaped gap to cause pollution. This embodiment improves and handles this phenomenon.

[0038] Specifically, before vibrating and shaking to clean, the electric push rod 9 is started to make the push baffle 10 extend out of the inside of the outer shell 1, and as the supplementary baffle 13 extends out completely, under the action of the spring member 12, the supplementary baffle 13 extends out of the groove completely, which can supplement and fill the fan-shaped gap, so as to prevent the suspended dust from returning to the inside of the outer shell 1. When it is necessary to retract the supplementary baffle 13 subsequently, the electromagnetic member 11 is started to adsorb the supplementary baffle 13 into the groove by magnetic attraction, and the electric push rod 9 is started to retract at the same time. When part of the supplementary baffle 13 moves to the first cavity, the electromagnetic member 11 is closed, and then the push baffle 10 is continuously retracted, until the complete retraction of the push baffle 10 is completed, and the residual dust on the surface can be left outside the first cavity (when the push baffle 10 is retracted, the end of the groove in the first cavity for installing the push baffle 10 scrapes and cleans the surface of the push baffle 10).

[0039] Through the design of spring member 12 (made of titanium nickel memory alloy, a long-life material) and the supplementary baffle 13, when the push baffle 10 is moved in the first cavity, it can avoid the moving groove 202, and after extending into the first cavity, the supplementary baffle 13 can be tightly attached to the sector gap formed by the protective door plate 3 and the scraping frame 41 by the action of the spring member 12, thereby achieving good sealing effect.

[0040] Third embodiment: A method for using an air quality detection device, the working steps are as follows: S1, when detecting the air quality, start the suction fan box 101, so that the air outside the shell body 1 enters the first cavity through the air inlet, after the preliminary detection by the dust sensor 5 and the interception by the filter plate 42, the gas is transferred to the second cavity, and the air quality sensor 7 detects the gas data in the gas, and then the gas is unidirectionally discharged through the exhaust pipe on the surface of the shell body 1; S2, after a round of detection, start the drive motor 61 to drive the moving frame and the push rod 63 to move towards the protective door plate 3, so that the scraping frame 41 moves horizontally inside the first cavity while scraping and cleaning the residual dust adhered to the inner wall of the first cavity; S3, when the filter plate 42 moves to be attached to the surface of the protective door plate 3, at this time the moving frame continues to move, under the cooperation of the continuous pushing action and the self-resetting shaft, the filter plate 42 starts to tilt and pushes the protective door plate 3 attached thereto to start clockwise movement, in this process, as the filter plate 42 continues to rotate, the upper region of the scraping frame 41 scrapes and cleans the inner surface of the protective door plate 3; S4, after the filter plate 42 is tilted and moves downward to the position close to the tail end of the protective door plate 3, the sector gap formed by the protective door plate 3 and the shell body 1 is closed by the cooperation of the push baffle 10 and the electric push rod 9, then the vibrator 8 is started to vibrate and clean the dust on the surface of the filter plate 42 and the scraping frame 41, then under the action of the reciprocating screw 62, the moving frame and the push rod 63 are returned, thereby driving the filter plate 42 and the scraping frame 41 to restore to the vertical placement state and move horizontally to reset, and the push baffle 10 is recycled and reset, and the protective door plate 3 is also closed to the shell body 1 under the action of gravity and magnetic attraction.

[0041] In combination with the current actual demand, the above-mentioned embodiments adopted by the present application do not limit the protection scope, various changes made within the knowledge range of those skilled in the art without departing from the concept of the present application still fall within the protection scope of the present application.

Claims

1. An air quality detection device, comprising an outer shell (1) mounted on a base frame (2), wherein a through slot is provided inside the base frame (2), characterized in that: A protective door plate (3) is mounted on one side surface of the outer shell (1) via an axle frame, and the space inside the outer shell (1) is divided into a first cavity and a second cavity by an isolation frame (201) mounted on the bottom frame (2), and a filter cleaning unit (4) is arranged on a side of the isolation frame (201) close to the protective door plate (3), and the filter cleaning unit (4) includes a scraping frame (41) that is slidably fitted in the first cavity, a filter plate (42) is embedded in the interior of the scraping frame (41), and a constraint frame groove (43) with a cross-shaped inner cross-section is mounted on the back of the filter plate (42), and a vibrator (8) is mounted on the surface of the constraint frame groove (43); A driving adjustment unit (6) for adjusting the movement state of the filter cleaning unit (4) is installed inside the second cavity, and the driving adjustment unit (6) includes a driving motor (61), and the output end of the driving motor (61) is connected to a reciprocating screw (62), and the surface of the reciprocating screw (62) is threadedly sleeved with a moving frame, and the surface of the moving frame is connected to a push rod (63), and the tail end of the push rod (63) is hinged to a sliding block installed in the constraint frame slot (43) through a movable ball.

2. An air quality detection device according to claim 1, characterized in that: A dust sensor (5) is embedded and installed on the surface of the filter plate (42), an air quality sensor (7) is installed inside the second cavity, and a suction fan box (101) located in the second cavity is installed on the inner top wall of the outer shell (1). When the movable frame moves to the end of the reciprocating screw (62) close to the protective door plate (3), the sliding block moves to the top position in the constraint frame slot (43).

3. An air quality detection device according to claim 1, characterized in that: The driving motor (61) is connected to the inner wall of the outer shell (1) through a lifting bracket, the length of the constraint frame groove (43) is less than the height of the filter plate (42), there is a magnetic attraction between the protective door plate (3) and the outer shell (1), an exhaust pipe with a built-in one-way valve is installed on the side of the outer shell (1) away from the protective door plate (3), and an air inlet is provided inside the protective door plate (3).

4. An air quality detection device according to claim 1, characterized in that: A rectangular through-groove is provided inside the isolation frame (201), and the cross-sectional area of ​​the through-groove is no greater than the cross-sectional area of ​​the filter plate (42). A horizontal gap exists between the tail end of the reciprocating screw (62) and the surface of the isolation frame (201).

5. An air quality detection device according to claim 1, characterized in that: The interior of the first cavity is provided with a movable groove (202) with one end portion passing through, the interior of the movable groove (202) is slidably connected to a movable block (203), and the top of the movable groove (202) is provided with an auxiliary groove with a length value less than the length value of the movable groove (202), the top of the movable block (203) is installed with an auxiliary block matching the auxiliary groove, the top of the movable block (203) is inclinedly provided with a guide slope (2031), and the surface of the movable block (203) is rotatably connected to a self-resetting shaft rod that crosses the interior of the scraping frame (41).

6. An air quality detection device according to claim 5, characterized in that: There is a gap between the installation position of the self-resetting shaft and the surface of the movable block (203) on the side facing away from the diversion slope (2031). When the self-resetting shaft moves to the inside of the through groove, the auxiliary block moves to the end of the auxiliary groove close to the protective door plate (3).

7. An air quality detection device according to claim 5, characterized in that: A push baffle (10) is installed through the interior of the No. 1 cavity, two electric push rods (9) are installed inside the No. 2 cavity through a suspension frame, and the power end of the electric push rod (9) is connected to the surface of the push baffle (10), the push baffle (10) extends through the interior of the isolation frame (201) to the interior of the No. 2 cavity, and the push baffle (10) is located outside the movable groove (202).

8. An air quality detection device according to claim 7, characterized in that: A groove is provided inside the push baffle (10), and a spring member (12) and an electromagnetic member (11) are installed inside the groove. The tail end of the spring member (12) is connected to a supplementary baffle (13) whose length is less than that of the push baffle (10), and the length of the supplementary baffle (13) is not less than that of the filter plate (42). A magnetic attraction layer that attracts the electromagnetic member (11) is arranged on the surface of the supplementary baffle (13).

9. A method for using an air quality detection device, using the air quality detection device according to any one of claims 1 to 8, characterized in that: The working steps are as follows: S1. When performing air quality detection, the suction fan box (101) is started, so that the air outside the outer shell (1) enters the No. 1 cavity through the air inlet, and after preliminary detection by the dust sensor (5) and interception processing by the filter plate (42), the gas is transferred to the No. 2 cavity, and the gas data in the gas is detected by the air quality sensor (7), and then the gas is discharged in one direction through the exhaust pipe on the surface of the outer shell (1); S2. After one round of testing is completed, the driving motor (61) is started to drive the movable frame and the push rod (63) to move toward the protective door panel (3), so that the scraping frame (41) moves horizontally inside the first cavity and scrapes away the residual dust adhering to the inner wall of the first cavity; S3, when the filter plate (42) moves to fit the surface of the protective door plate (3), the movable frame continues to move. Under the continuous pushing action and the cooperation of the self-resetting shaft, the filter plate (42) begins to tilt and pushes the protective door plate (3) in contact with it to start moving clockwise. During this process, as the filter plate (42) continues to rotate, the upper area of ​​the scraper frame (41) scrapes and cleans the inner surface of the protective door plate (3); S4. After the filter plate (42) moves downwardly to a position close to the tail end of the protective door plate (3), the fan-shaped gap formed by the protective door plate (3) and the outer shell (1) is closed by the cooperation of the push baffle (10) and the electric push rod (9). Then, the vibrator (8) is started to vibrate and clean the dust on the surface of the filter plate (42) and the scraping frame (41). Then, under the action of the reciprocating screw (62), the movable frame and the push rod (63) are driven to return, thereby driving the filter plate (42) and the scraping frame (41) to return to the vertical placement state and then move horizontally to reset, and the push baffle (10) is recovered and reset. The protective door plate (3) is also closed to the outer shell (1) under the action of gravity and magnetic attraction.

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