Air pollutant detection equipment

Abstract

The present invention provides an air pollutant detection device, which relates to the technical field of air detection devices, and comprises: an installation unit; an air pollutant detection unit is installed on the installation unit; a multifunctional unit is installed on the installation unit, the multifunctional unit is used for automatically sampling air, and the multifunctional unit is also used for controlling the air flow rate during detection; a replacement unit is installed on the installation unit, and the replacement unit is used for improving work efficiency during maintenance; two protective discs are provided, and the two protective discs are located above a mounting base, and the lower protective disc is welded to the top of the mounting base; the present invention can remind staff that a spare air detection sensor B needs to be placed in a protective shell, which is beneficial to subsequent maintenance work; it solves the problem that when the staff does not carry the detection sensor with them, the damaged detection sensor cannot be repaired in time, which affects the maintenance efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of air detection equipment, and more specifically, particularly relates to an air pollutant detection equipment. Background Art

[0002] Fine particulate matter is also called fine particles, fine particles, and PM2.5; fine particulate matter refers to particles in the ambient air with an aerodynamic equivalent diameter of less than or equal to 2.5 microns; it can remain suspended in the air for a long time, and the higher its concentration in the air, the more serious the air pollution.

[0003] The air pollutant detection equipment currently used still has the following shortcomings:

[0004] 1. Generally, only one detection sensor is installed. When the detection sensor needs to be cleaned or is damaged, the staff cannot find it in time, resulting in inaccurate subsequent detection data;

[0005] 2. The air flow rate will change with the weather, resulting in the inability to maintain consistent air flow rate during air detection, affecting the accuracy of air detection;

[0006] 3. When the staff does not carry the detection sensor with them, the damaged detection sensor cannot be repaired in time, which affects the maintenance efficiency. Summary of the invention

[0007] The disclosed embodiment relates to an air pollutant detection device, which has an installation unit, an air pollutant detection unit, a multi-functional unit and a replacement unit; it is convenient for staff to promptly discover damage to the air detection sensor A, thereby improving the detection accuracy of air pollutants; the air between the two protective discs does not flow, so that the air is detected in a static environment, thereby improving the accuracy of the detection data; it can remind staff that a spare air detection sensor B needs to be placed in the protective shell, which is beneficial to subsequent maintenance work.

[0008] In a first aspect of the present disclosure, an air pollutant detection device is provided, which specifically includes a mounting unit; an air pollutant detection unit is mounted on the mounting unit;

[0009] The mounting unit is provided with a multifunctional unit, the multifunctional unit is used for automatically sampling the air, and the multifunctional unit is also used for controlling the air flow rate during detection;

[0010] A replacement unit is installed on the installation unit, and the replacement unit is used to improve work efficiency during maintenance;

[0011] The mounting unit includes: a mounting base, a protective disc and a circular connecting rod; four mounting holes are opened at the bottom of the mounting base; there are two protective discs, and the two protective discs are located above the mounting base, and the lower protective disc is welded to the top of the mounting base; there are three circular connecting rods, and the three circular connecting rods are welded to the inner sides of the two protective discs.

[0012] In at least some embodiments, the mounting unit further includes: a mounting bracket and a semicircular fixing clamp; the mounting bracket is welded between two protective discs; there are three semicircular fixing clamps in total, and the three semicircular fixing clamps are mounted on the mounting bracket by screws.

[0013] In at least some embodiments, the mounting unit further includes: a mounting frame and a linkage rack; one end of the mounting frame is welded to the mounting base, and the other end of the mounting frame is welded to the protective disc above; the linkage rack is welded to the right side of the mounting frame.

[0014] In at least some embodiments, the multifunctional unit includes: an electric cylinder, a circular protective cover and an L-shaped mounting plate; the electric cylinders are provided with two in total, and the two electric cylinders are fixedly mounted on the top of the mounting base; the circular protective cover is fixedly mounted on the output shafts of the two electric cylinders, and the inner wall of the circular protective cover is in contact with the two protective discs; the L-shaped mounting plate is welded to the rear side of the circular protective cover.

[0015] In at least some embodiments, the multifunctional unit further includes: a connecting shaft, a guide impeller and a linkage gear; the connecting shaft is rotatably mounted on an L-shaped mounting plate; the guide impeller is welded to the front side of the connecting shaft; the linkage gear is welded to the outside of the connecting shaft, and the linkage gear can be meshed and connected with the linkage rack.

[0016] In at least some embodiments, the air pollutant detection unit includes: a control box, a data display screen and an air detection sensor A; the control box is welded to the front side of the circular protective cover; the data display screen is welded to the protective disc above, and the data display screen is electrically connected to the control box; there are three air detection sensors A in total, and the three air detection sensors A are installed on a mounting bracket and three semicircular fixing clips, and the three air detection sensors A are electrically connected to the control box; the data display screen is used to display the detection data of the three air detection sensors A.

[0017] In at least some embodiments, the replacement unit includes: a connecting frame, a protective shell and a circular guide shaft; there are two connecting frames in total, and the two connecting frames are welded to the mounting base; the protective shell is welded to the front side of the two connecting frames; there are two circular guide shafts in total, and the two circular guide shafts are slidably installed on the protective shell.

[0018] In at least some embodiments, the replacement unit also includes: a support plate, a reset spring and a positioning ring; the support plate is welded to the bottom of the two circular guide shafts, and the support plate is slidably installed inside the protective shell; there are two reset springs in total, and the two reset springs are installed on the outside of the two circular guide shafts, and the top ends of the two reset springs are welded to the protective shell, and the bottom ends of the two reset springs are welded to the support plate; the positioning ring is welded to the top of the support plate.

[0019] In at least some embodiments, the replacement unit also includes: a spare air detection sensor B, a U-shaped handle and a circular protective rod; the spare air detection sensor B is placed in a positioning ring, and the top of the spare air detection sensor B is in contact with the protective shell, and the spare air detection sensor B has the same function as the air detection sensor A; the U-shaped handle is welded to the bottom of the supporting plate; the circular protective rod is welded to the top of the supporting plate, and the circular protective rod passes through the protective shell.

[0020] In at least some embodiments, the replacement unit also includes: a buzzer alarm and a push switch; the buzzer alarm is fixedly installed at the bottom of the control box, and the buzzer alarm is electrically connected to the control box; the push switch is fixedly installed inside the circular protective rod, and the push switch is electrically connected to the buzzer alarm and the control box; when the bottom of the circular protective cover contacts the circular protective rod, the push switch is in a pass state, and the push switch is used to control the operation of the buzzer alarm.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. In the present invention, when one of the detection data on the data display screen has a large deviation from the other two detection data, the corresponding air detection sensor A may need to be cleaned or damaged. At this time, the staff first cleans the three air detection sensors A in detail, and then observes the deviations of the three detection data. When the deviations of the three detection data are small, the air detection sensor A is not damaged. When there is still a large deviation among the three detection data, the air detection sensor A is damaged. This facilitates the staff to promptly discover that the air detection sensor A is damaged, thereby improving the detection accuracy of air pollutants;

[0023] In addition, when the two electric cylinders drive the circular protective cover to move downward, the guide vane rotates under the action of the linkage rack and linkage gear. On the one hand, it automatically cleans the dust attached to the surface of the three air detection sensors A. On the other hand, it speeds up the air flow between the two protective discs, allowing the external air to flow quickly between the two protective discs, thus realizing automatic sampling of the detection air.

[0024] In addition, when the two electric cylinders drive the circular protective cover to move upward and reset, the circular protective cover seals the air between the two protective discs. At this time, the air between the two protective discs does not flow, allowing the air to be tested in a static environment, thereby improving the accuracy of the test data.

[0025] 2. The present invention serves as a storage for the spare air detection sensor B, which is convenient for the staff to replace the damaged air detection sensor A in time. When the spare air detection sensor B is taken out, the supporting plate automatically moves upward under the action of two reset tension springs;

[0026] In addition, when the bottom of the circular protective cover contacts the circular protective rod, the push switch is in the on state and the buzzer alarm starts working, which can remind the staff that a spare air detection sensor B needs to be placed in the protective shell, which is beneficial for subsequent maintenance work. When the staff forgets to place the spare air detection sensor B in the protective shell, the buzzer alarm will work every time the circular protective cover contacts the circular protective rod, thereby improving the reminder effect. The setting of the circular protective rod serves to store the push switch and avoid damage to the push switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0028] The drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention.

[0029] In the attached picture:

[0030] Figure 1 It is a three-dimensional structural schematic diagram of the present invention.

[0031] Figure 2 The present invention Figure 1 The structural diagram on the right side of .

[0032] Figure 3 It is a schematic diagram of the structure of the circular protective cover after the movement of the present invention.

[0033] Figure 4 The present invention Figure 3 Schematic diagram of the local enlarged structure of area A in the middle.

[0034] Figure 5 It is a structural schematic diagram of the multifunctional unit of the present invention.

[0035] Figure 6 The present invention Figure 2 Schematic diagram of the local enlarged structure of area B in the middle.

[0036] Figure 7It is a structural schematic diagram of the replacement unit of the present invention.

[0037] Figure 8 The present invention Figure 3 Schematic diagram of the right side perspective structure.

[0038] Fig. 9 The present invention Figure 8 Schematic diagram of the local enlarged structure of the C area in the middle.

[0039] Fig.10 The present invention Figure 1 Schematic diagram of the structure of the spare air detection sensor B after use.

[0040] List of reference numerals:

[0041] 1. Mounting unit; 101. Mounting base; 102. Protective disc; 103. Round connecting rod; 104. Mounting bracket; 105. Semicircular fixing clamp; 106. Mounting frame; 107. Linkage rack;

[0042] 2. Air pollutant detection unit; 201. Control box; 202. Data display screen; 203. Air detection sensor A;

[0043] 3. Multifunctional unit; 301. Electric cylinder; 302. Round protective cover; 303. L-shaped mounting plate; 304. Connecting shaft; 305. Guide impeller; 306. Linkage gear;

[0044] 4. Replacement unit; 401. Connecting frame; 402. Protective shell; 403. Circular guide shaft; 404. Support plate; 405. Reset spring; 406. Positioning ring; 407. Spare air detection sensor B; 408. U-shaped handle; 409. Circular protective rod; 410. Buzzer alarm; 411. Push switch. DETAILED DESCRIPTION

[0045] In order to make the purpose, scheme and advantages of the technical solution of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described in conjunction with the drawings of the specific embodiments of the present invention. Unless otherwise specified, the terms used herein have the usual meanings in the art. The same reference numerals in the drawings represent the same components.

[0046] Example 1: Please refer to Figures 1 to 6 As shown: The present invention provides an air pollutant detection device, comprising a mounting unit 1; an air pollutant detection unit 2 is mounted on the mounting unit 1;

[0047] A multifunctional unit 3 is installed on the installation unit 1, and the multifunctional unit 3 is used for automatically sampling the air, and the multifunctional unit 3 is also used for controlling the air flow rate during detection;

[0048] A replacement unit 4 is installed on the installation unit 1, and the replacement unit 4 is used to improve work efficiency during maintenance.

[0049] In the present disclosure, Figures 3 to 6 As shown, the mounting unit 1 includes: a mounting base 101, a protective disc 102 and a circular connecting rod 103; four mounting holes are opened at the bottom of the mounting base 101; there are two protective discs 102, and the two protective discs 102 are located above the mounting base 101, and the lower protective disc 102 is welded to the top of the mounting base 101; there are three circular connecting rods 103, and the three circular connecting rods 103 are welded to the inner sides of the two protective discs 102; the mounting unit 1 also includes: a mounting support The mounting bracket 104 and the semicircular fixing clip 105; the mounting bracket 104 is welded between the two protective discs 102; there are three semicircular fixing clips 105, and the three semicircular fixing clips 105 are installed on the mounting bracket 104 by screws; the mounting unit 1 also includes: a mounting frame 106 and a linkage rack 107; one end of the mounting frame 106 is welded to the mounting base 101, and the other end of the mounting frame 106 is welded to the upper protective disc 102; the linkage rack 107 is welded to the right side of the mounting frame 106;

[0050] The multifunctional unit 3 includes: an electric cylinder 301, a circular protective cover 302 and an L-shaped mounting plate 303; there are two electric cylinders 301 in total, and the two electric cylinders 301 are fixedly mounted on the top of the mounting base 101; the circular protective cover 302 is fixedly mounted on the output shafts of the two electric cylinders 301, and the inner wall of the circular protective cover 302 is in contact with the two protective discs 102; the L-shaped mounting plate 303 is welded to the rear side of the circular protective cover 302; the multifunctional unit 3 also includes: a connecting shaft 304, a guide vane 305 and a linkage gear 306; the connecting shaft 304 is rotatably mounted on the L-shaped mounting plate 303; the guide vane 305 is welded to the front side of the connecting shaft 304; the linkage gear 306 is welded to the outside of the connecting shaft 304, and the linkage gear 306 can be meshed and connected with the linkage rack 107;

[0051] The air pollutant detection unit 2 includes: a control box 201, a data display screen 202 and an air detection sensor A203; the control box 201 is welded to the front side of the circular protective cover 302; the data display screen 202 is welded to the upper protective disc 102, and the data display screen 202 is electrically connected to the control box 201; there are three air detection sensors A203, and the three air detection sensors A203 are installed on the mounting bracket 104 and the three semicircular fixing clips 105, and the three air detection sensors A203 are electrically connected to the control box 201; the data display screen 202 is used to display the detection data of the three air detection sensors A203;

[0052] Its specific function is: because the three air detection sensors A203 are electrically connected to the control box 201, and the data display screen 202 is used to display the detection data of the three air detection sensors A203, when one of the detection data on the data display screen 202 deviates greatly from the other two detection data, the corresponding air detection sensor A203 may need to be cleaned or damaged. At this time, the staff first cleans the three air detection sensors A203 in detail, and then observes the deviations of the three detection data. When the deviations of the three detection data are small, the air detection sensor A203 is not damaged. When there is still one of the three detection data with a large deviation, the air detection sensor A203 is damaged. This facilitates the staff to promptly discover the damage of the air detection sensor A203, thereby improving the detection accuracy of air pollutants.

[0053] Because the guide impeller 305 is welded on the front side of the connecting shaft 304, and the linkage gear 306 is welded on the outside of the connecting shaft 304, and the linkage gear 306 can be meshed and connected with the linkage rack 107, when the two electric cylinders 301 drive the circular protective cover 302 to move downward, the guide impeller 305 rotates under the action of the linkage rack 107 and the linkage gear 306. On the one hand, it automatically cleans the dust attached to the surface of the three air detection sensors A203. On the other hand, it speeds up the air flow speed between the two protective discs 102, so that the external air can quickly flow between the two protective discs 102, thereby realizing automatic sampling of the detected air. When the two electric cylinders 301 drive the circular protective cover 302 to move upward and reset, the circular protective cover 302 seals the air between the two protective discs 102. At this time, the air between the two protective discs 102 does not flow, so that the air is detected in a static environment, thereby improving the accuracy of the detection data.

[0054] Embodiment 2: Figures 7 to 10As shown, a replacement unit 4 is added on the basis of the first embodiment, and the replacement unit 4 includes: a connecting frame 401, a protective shell 402 and a circular guide shaft 403; there are two connecting frames 401, and the two connecting frames 401 are welded on the mounting base 101; the protective shell 402 is welded on the front side of the two connecting frames 401; there are two circular guide shafts 403, and the two circular guide shafts 403 are slidably mounted on the protective shell 402; the replacement unit 4 also includes: a supporting plate 404, a reset tension spring 405 and a positioning ring 406 The support plate 404 is welded to the bottom of the two circular guide shafts 403, and the support plate 404 is slidably installed inside the protective shell 402; there are two reset springs 405, and the two reset springs 405 are installed outside the two circular guide shafts 403, and the top ends of the two reset springs 405 are welded to the protective shell 402, and the bottom ends of the two reset springs 405 are welded to the support plate 404; the positioning ring 406 is welded to the top of the support plate 404; the replacement unit 4 also includes: a spare air detection sensor The spare air detection sensor B407 is placed in the positioning ring 406, and the top of the spare air detection sensor B407 is in contact with the protective shell 402, and the spare air detection sensor B407 has the same function as the air detection sensor A203; the U-shaped handle 408 is welded to the bottom of the support plate 404; the circular protection rod 409 is welded to the top of the support plate 404, and the circular protection rod 409 passes through the protective shell 402; the replacement unit 4 is also It includes: a buzzer alarm 410 and a push switch 411; the buzzer alarm 410 is fixedly installed at the bottom of the control box 201, and the buzzer alarm 410 is electrically connected to the control box 201; the push switch 411 is fixedly installed inside the circular protective rod 409, and the push switch 411 is electrically connected to the buzzer alarm 410 and the control box 201; when the bottom of the circular protective cover 302 contacts the circular protective rod 409, the push switch 411 is in a pass state, and the push switch 411 is used to control the operation of the buzzer alarm 410;

[0055] Its specific function is: because the spare air detection sensor B407 is placed in the positioning ring 406, and the top of the spare air detection sensor B407 is in contact with the protective shell 402, and the spare air detection sensor B407 has the same function as the air detection sensor A203, it plays a storage role for the spare air detection sensor B407, which is convenient for the staff to replace the damaged air detection sensor A203 in time, and because the two reset springs 405 are installed on the outside of the two circular guide shafts 403, and the top ends of the two reset springs 405 are welded to the protective shell 402, and the bottom ends of the two reset springs 405 are welded to the support plate 404, when the spare air detection sensor B407 is taken out, the support plate 404 automatically moves upward under the action of the two reset springs 405;

[0056] Because the buzzer alarm 410 is electrically connected to the control box 201, and the push switch 411 is electrically connected to the buzzer alarm 410 and the control box 201, and the push switch 411 is used to control the operation of the buzzer alarm 410, when the bottom of the circular protective cover 302 contacts the circular protective rod 409, the push switch 411 is in a pass state, and the buzzer alarm 410 starts to work, which can remind the staff that a spare air detection sensor B407 needs to be placed in the protective shell 402, which is beneficial for subsequent maintenance work. When the staff forgets to place the spare air detection sensor B407 in the protective shell 402, the buzzer alarm 410 will work every time the circular protective cover 302 contacts the circular protective rod 409, thereby improving the reminder effect. The setting of the circular protective rod 409 has a storage effect on the push switch 411, thereby avoiding damage to the push switch 411.

[0057] The specific usage and function of this embodiment are as follows:

[0058] When the present invention is used, the staff first installs the mounting base 101 at the site to be detected by bolts. When the two electric cylinders 301 drive the circular protective cover 302 to move downward, the guide vane 305 rotates under the action of the linkage rack 107 and the linkage gear 306. On the one hand, it automatically cleans the dust attached to the surface of the three air detection sensors A203. On the other hand, it speeds up the air flow speed between the two protective discs 102, so that the external air can quickly flow between the two protective discs 102, realizing the automatic sampling of the detected air. When the two electric cylinders 301 drive the circular protective cover 302 to move upward and reset, the circular protective cover 302 seals the air between the two protective discs 102. At this time, The air between the two protective discs 102 does not flow, so that the air is detected in a static environment, which improves the accuracy of the detection data; when one of the detection data on the data display screen 202 deviates greatly from the other two detection data, the corresponding air detection sensor A203 may need to be cleaned or damaged. At this time, the staff first cleans the three air detection sensors A203 in detail, and then observes the deviations of the three detection data. When the deviations of the three detection data are small, the air detection sensor A203 is not damaged. When there is still one of the three detection data with a large deviation, the air detection sensor A203 is damaged. It is convenient for the staff to find out the damage of the air detection sensor A203 in time, which improves the detection accuracy of air pollutants.

[0059] When replacing the air detection sensor A203, the staff pulls down the U-shaped handle 408, takes out the spare air detection sensor B407 in the positioning ring 406, and then replaces the spare air detection sensor B407 in the position of the damaged air detection sensor A203. When the spare air detection sensor B407 is taken out, the supporting plate 404 automatically moves upward under the action of two reset springs 405; when the bottom of the circular protective cover 302 contacts the circular protective rod 409, the push switch 411 is in a pass state, and the buzzer alarm 410 starts working, which can remind the staff that the spare air detection sensor B407 needs to be placed in the protective shell 402, which is beneficial to subsequent maintenance work. The setting of the circular protective rod 409 has a storage effect on the push switch 411, thereby avoiding damage to the push switch 411.

[0060] In this article, there are a few points to note:

[0061] 1. The drawings of the embodiments of the present disclosure only involve structures related to the embodiments of the present disclosure, and other structures may refer to general designs.

[0062] 2. In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to obtain new embodiments.

[0063] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. An air pollutant detection device, comprising a mounting unit (1); characterized in that: An air pollutant detection unit (2) is installed on the installation unit (1); The mounting unit (1) is provided with a multifunctional unit (3), the multifunctional unit (3) being used for automatically sampling air, and the multifunctional unit (3) being also used for controlling the air flow rate during detection; A replacement unit (4) is installed on the installation unit (1), and the replacement unit (4) is used to improve work efficiency during maintenance; The mounting unit (1) comprises: a mounting base (101), a protective disc (102) and a circular connecting rod (103); four mounting holes are provided at the bottom of the mounting base (101); two protective discs (102) are provided, and the two protective discs (102) are located above the mounting base (101), and the lower protective disc (102) is welded to the top of the mounting base (101); three circular connecting rods (103) are provided, and the three circular connecting rods (103) are welded to the inner sides of the two protective discs (102); the mounting unit (1) also comprises: a mounting bracket (10 4) and a semicircular fixing clip (105); the mounting bracket (104) is welded between the two protective discs (102); a total of three semicircular fixing clips (105) are provided, and the three semicircular fixing clips (105) are mounted on the mounting bracket (104) by screws; the mounting unit (1) further comprises: a mounting frame (106) and a linkage rack (107); one end of the mounting frame (106) is welded to the mounting base (101), and the other end of the mounting frame (106) is welded to the upper protective disc (102); the linkage rack (107) is welded to the right side of the mounting frame (106); The multifunctional unit (3) comprises: an electric cylinder (301), a circular protective cover (302) and an L-shaped mounting plate (303); two electric cylinders (301) are provided, and the two electric cylinders (301) are fixedly mounted on the top of the mounting base (101); the circular protective cover (302) is fixedly mounted on the output shafts of the two electric cylinders (301), and the inner wall of the circular protective cover (302) is in contact with the two protective discs (102); the L-shaped mounting plate (303) is welded to the The multifunctional unit (3) further comprises: a connecting shaft (304), a guide vane (305) and a linkage gear (306); the connecting shaft (304) is rotatably mounted on the L-shaped mounting plate (303); the guide vane (305) is welded to the front side of the connecting shaft (304); the linkage gear (306) is welded to the outside of the connecting shaft (304), and the linkage gear (306) can be meshed and connected with the linkage rack (107); The replacement unit (4) comprises: a connecting frame (401), a protective shell (402) and a circular guide shaft (403); two connecting frames (401) are provided, and the two connecting frames (401) are welded to the mounting base (101); the protective shell (402) is welded to the front sides of the two connecting frames (401); two circular guide shafts (403) are provided, and the two circular guide shafts (403) are slidably mounted on the protective shell (402); the replacement unit (4) further comprises: a supporting plate (404), a reset tension spring (405) and a positioning ring (4 06); the support plate (404) is welded to the bottom of the two circular guide shafts (403), and the support plate (404) is slidably installed inside the protective shell (402); there are two reset springs (405), and the two reset springs (405) are installed outside the two circular guide shafts (403), and the top ends of the two reset springs (405) are welded to the protective shell (402), and the bottom ends of the two reset springs (405) are welded to the support plate (404); the positioning ring (406) is welded to the top of the support plate (404); The replacement unit (4) further comprises: a spare air detection sensor B (407), a U-shaped handle (408) and a circular protective rod (409); the spare air detection sensor B (407) is placed in the positioning ring (406), and the top of the spare air detection sensor B (407) is in contact with the protective shell (402), and the spare air detection sensor B (407) has the same function as the air detection sensor A (203); the U-shaped handle (408) is welded to the bottom of the supporting plate (404); the circular protective rod (409) is welded to the top of the supporting plate (404), and the circular protective rod (409) passes through the protective shell (402). The replacement unit (4) further comprises: a buzzer alarm (410) and a push switch (411); the buzzer alarm (410) is fixedly mounted on the bottom of the control box (201), and the buzzer alarm (410) is electrically connected to the control box (201); the push switch (411) is fixedly mounted inside the circular protective rod (409), and the push switch (411) is electrically connected to the buzzer alarm (410) and the control box (201); when the bottom of the circular protective cover (302) contacts the circular protective rod (409), the push switch (411) is in a pass state, and the push switch (411) is used to control the operation of the buzzer alarm (410).

2. An air pollutant detection device according to claim 1, characterized in that: The air pollutant detection unit (2) comprises: a control box (201), a data display screen (202) and an air detection sensor A (203); the control box (201) is welded to the front side of the circular protective cover (302); the data display screen (202) is welded to the protective disc (102) above, and the data display screen (202) is electrically connected to the control box (201); a total of three air detection sensors A (203) are provided, and the three air detection sensors A (203) are mounted on a mounting bracket (104) and three semicircular fixing clips (105), and the three air detection sensors A (203) are electrically connected to the control box (201); the data display screen (202) is used to display detection data of the three air detection sensors A (203).

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