Multi-channel anti-pollution switching device and method for VOCs sampling device

Abstract

The present invention discloses a multi-channel anti-pollution switching device and method for a VOCs sampling device, which belongs to the technical field of exhaust gas sampling and processing devices and methods, and includes: a sampling switching mechanism, wherein the sampling switching mechanism includes a motor fixed on a housing, the output shaft of the motor passes through the housing and extends to a movable shaft, and vertically arranged activated carbon plates are fixedly installed around the movable shaft, the activated carbon plates are provided with adsorption holes adapted thereto, and one end of the activated carbon plates is integrally formed and connected with an arc-shaped protrusion, the bottom end of the arc-shaped protrusion movably abuts against a first lifting rod, and the first lifting rod is connected to a panel through a lifting block. The present invention can solve the technical problem that the phenomenon of heat loss in the reaction chamber is particularly serious due to heat transfer, and the reaction chamber cannot be adjusted to a corresponding constant temperature state even under the continuous action of a heater, resulting in the pollutants being unable to effectively contact the activated carbon during the liquefaction process, thereby affecting the purification quality.

Description

Technical Field

[0001] The present invention belongs to the technical field of waste gas sampling and processing devices and methods, and specifically relates to a multi-channel anti-pollution switching device and method for a VOCs sampling device. Background Art

[0002] VOCs, or volatile organic compounds, are a common type of air pollutant primarily derived from factory emissions. They are commonly found in industries such as paint production, the chemical fiber industry, metal coating, chemical coatings, shoe and leather manufacturing, electroplating, plywood manufacturing, tire manufacturing, and wastewater treatment plants. Harmful VOCs include acetone, toluene, phenol, dimethylaniline, formaldehyde, n-hexane, ethyl acetate, and ethanol.

[0003] The main methods of VOCs purification are as follows: 1. Adsorption method, principle: using the porous structure of adsorption materials such as activated carbon and molecular sieves to adsorb VOCs, suitable for low-concentration and large-volume exhaust gas treatment; 2. Absorption method, principle: using the physical or chemical properties of the absorbent to separate VOCs, suitable for high-concentration, water-soluble or easily soluble in organic solvents exhaust gas; 3. Condensation method, principle: by lowering the temperature or increasing the pressure to condense VOCs into liquid for recovery, suitable for high-concentration and small-volume exhaust gas.

[0004] VOCs can spontaneously volatilize at room temperature and pressure, such as 20°C to 25°C, and remain in a gaseous state. However, in cold regions or seasons, the reaction chamber temperature must be kept relatively constant to prevent liquefaction and thus affect the effective adsorption of activated carbon. Due to the large temperature difference between the inside and outside of the reaction chamber, heat loss due to transfer within the reaction chamber is particularly severe. Even with the continuous operation of the heater, the reaction chamber cannot be adjusted to a corresponding constant temperature. As a result, the pollutants cannot effectively contact the activated carbon during the liquefaction process, which in turn affects the purification quality and causes air pollution during direct discharge, which is detrimental to the environment. When exhaust gas containing VOCs passes through the activated carbon bed, the VOC molecules are adsorbed onto the pore surface of the activated carbon through intermolecular forces and partial chemical bonding. Due to the large specific surface area of ​​the activated carbon, the VOC molecules can fully contact the activated carbon, resulting in efficient adsorption. Summary of the Invention

[0005] The purpose of the present invention is to provide a multi-channel anti-pollution switching device and method for a VOCs sampling device to solve the technical problem that due to the large temperature difference between the inside and outside of the reaction, the heat loss in the reaction chamber is particularly serious. Even under the continuous action of the heater, the reaction chamber cannot be adjusted to a corresponding constant temperature state, resulting in the pollutants being unable to effectively contact with the activated carbon during the liquefaction process, thereby affecting the purification quality.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The multi-channel anti-pollution switching device of the VOCs sampling device includes:

[0008] The sampling switching mechanism includes a motor fixed to the housing, the output shaft of the motor passes through the housing and extends to the movable shaft, and vertically arranged activated carbon plates are fixedly installed around the movable shaft. The activated carbon plates are provided with adsorption holes adapted thereto, and one end of the activated carbon plates is integrally formed with an arc-shaped protrusion;

[0009] The bottom end of the arc-shaped protrusion movably contacts the first lifting rod, and the first lifting rod is connected to the panel through a lifting block. Both sides of the top of the panel are connected to the extended ends of the inner wall of the box through a first spring, and both sides of the bottom end of the panel are equipped with a shielding plate movably connected to the side wall of the box through a bracket. As the first lifting rod drives the panel to move up and down, the shielding plate and the air inlets on both sides of the box are sealed against each other or separated, and at the same time, the panel and the air inlet are closed or opened accordingly.

[0010] Furthermore, the top end of the arc-shaped protrusion movably abuts against the second lifting rod, and an arc-shaped surface is provided at one end of the first lifting rod and the second lifting rod, and the top end of the second lifting rod passes through the cover body and extends to the push rod, the cover body and the side wall of the box body are connected by a fixed rod, and a guide groove connected to the push rod is provided on the cover body, both sides of the push rod are connected to the support plate by a second spring, and one end of the support plate is fixed to the inner wall of the cover body by a cross beam.

[0011] Furthermore, the top end of the push rod passes through the cover and extends to the first slider. The first slider and the second sliders at both ends are connected by a swing rod. One end of the second slider is connected to a sealing plate symmetrical with the center of the box. The sealing plate is telescopically connected to a fixed plate with a slot.

[0012] Furthermore, both sides of the swing rod are installed on the first slider and the second slider by a rotational connection, and one end of the sealing plate is integrally formed with a resistance part, and the upper and lower ends of the resistance part are provided with inclined surfaces, and the inclined surfaces are movably resisted and fitted in the sealing groove of the sealing plate at the other end, and both sides of the outer wall of the sealing plate are provided with protective plates installed on the side walls of the box body.

[0013] Furthermore, a movable frame is fixedly installed on the top of the sealing plate, one end of the movable frame passes through the battery box and extends to the movable block, and the other end is connected to the hook rod, both sides of the movable block are connected to conical plug rods extending to the gap between the battery packs, and one end of the movable block and the inner wall of the battery box are connected by a third spring, positioning holes are provided on the inner wall of the battery box at both ends of the battery pack, and limiting plates are provided on the inner wall of the battery box at both ends of the outside of the battery pack, and the battery pack is installed on the fan at the air outlet of the box by electrical connection.

[0014] Furthermore, one end of the hook rod movably contacts a guide plate disposed at both ends of the air outlet, and the guide plate is movably connected to the inner wall of the box via a rotating shaft.

[0015] Furthermore, a heater is provided between the panel and the activated carbon plate and is placed on the inner wall of the box, and a heating cavity is formed between the heater and the inner wall of the box.

[0016] The multi-channel anti-pollution switching method of a VOCs sampling device comprises the following steps:

[0017] S1.1. VOCs are transported into the chamber through the three-way solenoid valve outside the air inlet. The heater activates and controls the temperature inside the chamber. The activated carbon plate rotates, separating the arc-shaped protrusions on the plate from the first and second lifting rods.

[0018] S1.2. During step S1.1, the first lifting rod moves upward under the action of elastic recovery and drives the panel away from the air inlet. The second lifting rod drives the sealing plates at both ends to move toward the center and close the heating chamber under the action of mechanical transmission.

[0019] S1.3. As the panel moves upward, the volume of the heating chamber is compressed and the temperature rises, thereby compensating for the heat loss in the heating chamber due to heat conduction inside the box, thereby regulating the internal temperature of the heating chamber and preventing the liquefaction of VOCs pollutants.

[0020] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0021] (1) In the present invention, the activated carbon plates on the movable shaft are distributed vertically around. In this way, after the adsorption holes on the horizontal activated carbon plate adsorb and filter the VOCs pollutants, the vertically distributed activated carbon plate can be directly converted to a horizontal state by rotation, thereby replacing the function of re-filtration and adsorption. In addition, it does not need to be frequently replaced, which reduces manpower and is convenient for personnel operation. During the rotation of the activated carbon plate, the arc-shaped protrusion and the first lifting rod and the second lifting rod are rotated and separated at the same time. The first lifting rod moves upward under the elastic recovery action of the first spring, and then separates from the air inlet and fits on the inner wall of the box. At the same time, the second lifting rod is elastically restored by the second spring. It recovers and moves downward under its own weight, and under the action of mechanical transmission, drives the sealing plates at both ends to move toward the center to close the air outlet, thereby forming a relatively sealed space in the heating chamber inside the box. During the upward movement of the panel, the gas is compressed, and the work done by the gas is converted into internal energy, thereby increasing the temperature inside the heating chamber, thereby compensating for the heat loss caused by heat conduction in the box, and then better controlling and adjusting the temperature inside the heating chamber to keep it at a certain constant temperature. This can ensure that the VOCs pollutants are always in a gaseous state, and can fully contact with the activated carbon plate, thereby ensuring the filtration quality and being beneficial to environmental protection.

[0022] (2) In the present invention, when the second lifting rod is in the process of moving upward, it means that the VOCs pollutants are in normal exhaust work. At this time, the sealing plates at both ends move outward. During the movement, one end of the moving frame drives the conical plug rod to separate from the gap between the battery pack, and then the battery packs are connected and the fan is powered normally, thereby accelerating the gas discharge speed. The other end of the moving frame uses the hook rod to interact with the guide plate, so that the guide plates at both ends rotate downward and form a conical guide port. By reducing the area of ​​the outlet area to increase the gas flow rate, the gas outflow can be further accelerated quickly and smoothly, thereby improving the safety and reliability of the device.

[0023] (3) In the present invention, the entire anti-pollution switching treatment method has a high degree of automation, simple operation, reasonable design, and strong integrated performance. It can ensure that the chamber is in a certain constant temperature state, with good temperature control and adjustment effect. It does not require the help of additional heating equipment, ensuring the full progress of the filtration reaction. The activated carbon plate can be replaced and used by rotation, with high utilization rate, avoiding the tedious equipment replacement and improving the working efficiency of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 This is a schematic diagram of the structure of the multi-channel anti-pollution switching device of the VOCs sampling device of the present invention. Figure 1 ;

[0026] Figure 2 This is a schematic diagram of the interior of the multi-channel anti-pollution switching device of the VOCs sampling device of the present invention;

[0027] Figure 3 This invention Figure 2 Direction front view;

[0028] Figure 4 This is a schematic diagram of the connection between the movable shaft and the activated carbon plate of the present invention;

[0029] Figure 5 This invention Figure 2 A magnified view of point A;

[0030] Figure 6 It is a schematic diagram of the interior of the cover body of the present invention;

[0031] Figure 7 This is a schematic diagram of the connection between the tapered rod and the battery pack of the present invention;

[0032] Figure 8 This is a schematic diagram of the connection between the sealing plate and the lifting block of the present invention;

[0033] Figure 9 It is a flow chart of the multi-channel anti-pollution switching method of the VOCs sampling device of the present invention.

[0034] Figure numerals: 1. sampling switching mechanism; 2. box body; 3. motor; 4. activated carbon plate; 5. adsorption hole; 6. arc-shaped protrusion; 7. first lifting rod; 8. lifting block; 9. panel; 10. first spring; 11. shielding plate; 12. second lifting rod; 13. arc-shaped surface; 14. cover body; 15. push rod; 16. second spring; 17. support plate; 18. first slider; 19. second slider; 20. swing rod; 21. sealing plate; 22. fixed plate; 23. interference part; 24. inclined surface; 25. protective plate; 26. movable frame; 27. battery box; 28. movable block; 29. ​​hook rod; 30. battery pack; 31. conical plug rod; 32. third spring; 33. limit plate; 34. fan; 35. guide plate; 36. heater. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0036] Reference Manual Figure 1 -Attached Figure 9 As shown, the multi-channel anti-pollution switching device of the VOCs sampling device includes: a sampling switching mechanism 1, the sampling switching mechanism 1 includes a motor 3 fixed on a box body 2, the output shaft of the motor 3 passes through the box body 2 and extends to the movable shaft, and the movable shaft is fixedly mounted with vertically arranged activated carbon plates 4. The activated carbon plates 4 are provided with adsorption holes 5 adapted thereto, and one end of the activated carbon plates 4 is integrally formed and connected with an arc-shaped protrusion 6;

[0037] The bottom end of the arc-shaped protrusion 6 movably contacts the first lifting rod 7, and the first lifting rod 7 is connected to the panel 9 through the lifting block 8. Both sides of the top of the panel 9 are connected to the extended end of the inner wall of the box body 2 through the first spring 10. Both sides of the bottom end of the panel 9 are equipped with a baffle 11 movably connected to the side wall of the box body 2 through a bracket. As the first lifting rod 7 drives the panel 9 to move up and down, the baffle 11 and the air inlets on both sides of the box body 2 are sealed against each other or separated, and at the same time, the panel 9 and the air inlet are closed or opened accordingly.

[0038] Specifically, a baffle 11 connected to the bottom bracket of the panel 9 is provided, so that when the panel 9 moves upward, the baffle 11 can play a corresponding shielding and closing role on the air inlet. This can prevent VOCs pollutants from entering the bottom of the box body 2 during the expansion of the other end of the panel 9, thereby affecting the normal filtering and adsorption work. On the other hand, it can also play a corresponding closing role on the air inlet during the descending process, preventing VOCs pollutants from flowing back during the compression process of the bottom of the panel 9, thereby affecting the normal use of the device.

[0039] By extension, a three-way solenoid valve is used to switch between sampling and back-flushing modes. During back-flushing, the carrier gas flushes the contaminated pipeline in the opposite direction and blows the particulate matter into the external dust collecting chamber; each channel air path component is connected by a snap-on seal, thereby realizing tool-free disassembly and cleaning. The above-mentioned blowing component is a conventional technical means for those skilled in the art, so it will not be described in detail, but it does not affect the effective implementation of the technical solution of the present invention.

[0040] The activated carbon plates 4 on the movable axis are distributed vertically around. In this way, after the adsorption holes 5 on the horizontal activated carbon plate 4 adsorb and filter the VOCs pollutants, the vertically distributed activated carbon plate 4 can be directly converted to a horizontal state by rotation, thereby replacing the function of re-filtration and adsorption, and it does not need to be frequently replaced, which saves manpower and is convenient for personnel operation. During the rotation of the activated carbon plate 4, the arc-shaped protrusion 6 and the first lifting rod 7 and the second lifting rod 12 are rotated and separated at the same time. The first lifting rod 7 moves upward under the elastic recovery action of the first spring 10, and then separates from the air inlet and fits on the inner wall of the box body 2. At the same time, the second lifting rod 12 is elastically restored by the second spring 16. The panel 9 moves downward under its own weight and recovery, and under the action of mechanical transmission, drives the sealing plates 21 at both ends to move toward the center to close the air outlet, so that the heating chamber inside the box body 2 can form a relatively sealed space. During the upward movement of the panel 9, the gas is compressed, and the work done by the gas is converted into internal energy, thereby increasing the temperature inside the heating chamber, thereby compensating for the heat loss caused by heat conduction in the box body 2, and then better controlling and adjusting the temperature inside the heating chamber to keep it in a certain constant temperature state, which can ensure that the VOCs pollutants are always in a gaseous state, and can fully contact with the activated carbon plate 4, thereby ensuring the filtration quality and being beneficial to environmental protection.

[0041] The top end of the arc-shaped protrusion 6 movably abuts against the second lifting rod 12. An arc-shaped surface 13 is provided at one end of the first lifting rod 7 and the second lifting rod 12, and the top end of the second lifting rod 12 passes through the cover body 14 and extends to the push rod 15. The cover body 14 and the side wall of the box body 2 are connected by a fixed rod, and a guide groove connected to the push rod 15 is provided on the cover body 14. Both sides of the push rod 15 are connected to the support plate 17 through a second spring 16, and one end of the support plate 17 is fixed to the inner wall of the cover body 14 through a crossbeam.

[0042] Specifically, the arc-shaped protrusion 6 on the activated carbon plate 4 cooperates with the lifting components at both ends to convert the rotational movement of the arc-shaped protrusion 6 into the up and down movement of the first lifting rod 7 and the second lifting rod 12. During the up and down movement of the second lifting rod 12, the second spring 16 and the guide groove provided in the cover body 14 can not only play a buffering and regulating role in the movement of the push rod 15, but also play a limiting and guiding role in the movement of the push rod 15, thereby preventing the moving part from deviating from its position during the movement, thereby ensuring the accuracy of the movement of the moving part.

[0043] The top end of the push rod 15 passes through the cover body 14 and extends to the first slider 18. The first slider 18 and the second sliders 19 at both ends are connected by a swing rod 20. One end of the second slider 19 is connected to a sealing plate 21 symmetrical with the center of the box body 2. The sealing plate 21 is telescopically connected to a fixed plate 22 with a slot.

[0044] Both sides of the swing rod 20 are installed on the first slider 18 and the second slider 19 by a rotational connection. One end of the sealing plate 21 is integrally formed with a resistance part 23. The resistance part 23 has inclined surfaces 24 at both ends, and the inclined surfaces 24 are movably resisted and fit into the sealing groove of the sealing plate 21 at the other end. Both sides of the outer wall of the sealing plate 21 are provided with protective plates 25 installed on the side walls of the box body 2.

[0045] The rotating connection setting at both ends of the swing rod 20 can convert the linear motion of the push rod 15 into the horizontal motion of the sealing plate 21, and the inclined surface 24 on the sealing plate 21 cooperates with the sealing groove to ensure the sealing of the sealing plates 21 when they are in contact with each other. At the same time, since the sealing plate 21 is telescopically connected in the groove of the fixed plate 22, a gap is formed between the sealing plate 21 and the side wall of the box body 2. Therefore, the protective plate 25 is set to fill the gap, which can ensure the sealing of the air outlet when the sealing plate 21 moves in the centering direction, thereby forming a relatively sealed heating space.

[0046] A movable frame 26 is fixedly installed on the top of the sealing plate 21. One end of the movable frame 26 passes through the battery box 27 and extends to the movable block 28. The other end is connected to the hook rod 29. Both sides of the movable block 28 are connected with a conical plug rod 31 extending to the gap between the battery packs 30, and one end of the movable block 28 and the inner wall of the battery box 27 are connected by a third spring 32. Positioning holes are provided at both ends of the battery pack 30 and the outer ends of the battery pack 30 are provided with limit plates 33 provided on the inner wall of the battery box 27. The battery pack 30 is installed on the fan 34 at the air outlet of the box 2 by electrical connection. One end of the hook rod 29 movably contacts the guide plates 35 provided at both ends of the air outlet. The guide plates 35 are movably connected to the inner wall of the box 2 through a rotating shaft.

[0047] Specifically, the third spring 32 between the movable block 28 and the battery box 27 can also be adaptively replaced with a telescopic rod. Since the sealing plate 21 itself has a reset component, the setting of the telescopic rod can help the movable block 28 to have a corresponding guiding effect when moving, and the limit plate 33 on the inner wall of the battery box 27 can provide corresponding protection for the installed battery pack 30 to prevent deviation during the installation process, thereby ensuring that the battery pack 30 can be effectively installed in the positioning hole.

[0048] When the activated carbon plate 4 is not in contact with the first lifting rod 8, an opening is formed between the panel 9 and the air inlet on the box body 2, and corresponding guide grooves are also formed between the sealing plates 21, so as to facilitate the normal inflow and outflow of VOCs pollutants. At this time, the guide plate 35 is distributed in the vertical direction, thereby playing a diversion role.

[0049] When the second lifting rod 12 is moving upward, it means that the VOCs pollutants are being exhausted normally. At this time, the sealing plates 21 at both ends move outward. During the movement, one end of the mobile frame 26 drives the conical plug rod 31 to separate from the gap between the battery pack 30, and then the battery packs 30 are connected and the fan 34 is powered normally, thereby accelerating the gas discharge speed. The other end of the mobile frame 26 is subjected to the active interference effect of the hook rod 29 and the guide plate 35, so that the guide plates 35 at both ends rotate downward and form a conical guide port, which increases the gas flow rate by reducing the area of ​​the outlet area, and can further quickly and steadily accelerate the gas outflow, thereby improving the safety and reliability of the device.

[0050] A heater 36 placed on the inner wall of the box body 2 is provided between the panel 9 and the activated carbon plate 4. A heating chamber is formed between the heater 36 and the inner wall of the box body 2. The output shaft of the motor 3 passes through the box body 2 and extends to the movable shaft. The output shaft of the motor 3 and the movable shaft are connected by a coupling, so that the output power of the motor 3 can be effectively transmitted to the movable shaft, and the connection between the two can be connected by a sealing ring, thereby ensuring the sealing of the inner wall of the box body 2 and preventing gas leakage.

[0051] The multi-channel anti-pollution switching method of a VOCs sampling device comprises the following steps:

[0052] S1.1. VOCs are transported into chamber 2 through the three-way solenoid valve outside the air inlet. Heater 36 is activated to control the temperature inside chamber 2, and activated carbon plate 4 is rotated so that arc-shaped protrusion 6 on activated carbon plate 4 rotates away from first lifting rod 7 and second lifting rod 12.

[0053] S1.2. During step S1.1, the first lifting rod 7 moves upward under the action of elastic recovery and drives the panel 9 away from the air inlet. The second lifting rod 12 drives the sealing plates 21 at both ends to move in the center and close the heating chamber under the action of mechanical transmission.

[0054] S1.3. During the upward movement of the panel 9, the volume of the heating chamber is compressed and the temperature rises, thereby compensating for the heat loss of the heating chamber in the box 2 due to heat conduction, thereby adjusting the internal temperature of the heating chamber and avoiding the liquefaction of VOCs pollutants.

[0055] The entire anti-pollution switching treatment method has a high degree of automation, simple operation, reasonable design, and strong integrated performance. It can ensure that the cavity is in a certain constant temperature state, has a good temperature control and adjustment effect, does not require the aid of additional heating equipment, and ensures the full progress of the filtration reaction. The activated carbon plate 4 is replaced and used by rotation, with a high utilization rate, avoiding the tedious equipment replacement and improving the working efficiency of the device.

[0056] The above are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

[0057] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A multi-channel anti-pollution switching device for a VOCs sampling device, characterized in that: include: A sampling switching mechanism (1), the sampling switching mechanism (1) comprising a motor (3) fixed on a housing (2), an output shaft of the motor (3) passing through the housing (2) and extending to a movable shaft, vertically arranged activated carbon plates (4) fixedly mounted on all four sides of the movable shaft, adsorption holes (5) adapted thereto being provided on the activated carbon plates (4), and an arc-shaped protrusion (6) integrally formed and connected to one end of the activated carbon plates (4); The bottom end of the arc-shaped protrusion (6) movably contacts the first lifting rod (7), and the first lifting rod (7) is connected to the panel (9) through the lifting block (8). Both sides of the top of the panel (9) are connected to the extended end of the inner wall of the box body (2) through the first spring (10). Both sides of the bottom end of the panel (9) are equipped with a shielding plate (11) movably connected to the side wall of the box body (2) through a bracket. As the first lifting rod (7) drives the panel (9) to move up and down, the shielding plate (11) and the air inlets on both sides of the box body (2) are sealed against each other or separated, and at the same time, the panel (9) and the air inlet are closed or opened accordingly.

2. The multi-channel anti-pollution switching device of the VOCs sampling device according to claim 1 is characterized in that: The top end of the arc-shaped protrusion (6) movably contacts the second lifting rod (12), one end of each of the first lifting rod (7) and the second lifting rod (12) is provided with an arc surface (13), and the top end of the second lifting rod (12) passes through the cover body (14) and extends to the push rod (15), the cover body (14) and the side wall of the box body (2) are connected by a fixed rod, and a guide groove connected to the push rod (15) is provided on the cover body (14), both sides of the push rod (15) are connected to the support plate (17) by a second spring (16), and one end of the support plate (17) is fixed to the inner wall of the cover body (14) through a crossbeam.

3. The multi-channel anti-pollution switching device of the VOCs sampling device according to claim 2, characterized in that: The top end of the push rod (15) passes through the cover (14) and extends to the first slider (18). The first slider (18) and the second sliders (19) at both ends are connected via a swing rod (20). One end of the second slider (19) is connected to a sealing plate (21) symmetrical with the center of the box (2). The sealing plate (21) is telescopically connected to a fixed plate (22) with a notch.

4. The multi-channel anti-pollution switching device of the VOCs sampling device according to claim 3 is characterized in that: Both sides of the swing rod (20) are mounted on the first slider (18) and the second slider (19) by means of a rotational connection. One end of the sealing plate (21) is integrally formed with a contact portion (23). The contact portion (23) is provided with inclined surfaces (24) at both upper and lower ends, and the inclined surfaces (24) are movably contacted and fitted in the sealing groove of the sealing plate (21) at the other end. Both sides of the outer wall of the sealing plate (21) are provided with protective plates (25) mounted on the side walls of the box body (2).

5. The multi-channel anti-pollution switching device of the VOCs sampling device according to claim 4, characterized in that: A movable frame (26) is fixedly mounted on the top of the sealing plate (21), one end of the movable frame (26) passes through the battery box (27) and extends to the movable block (28), and the other end is connected to the hook rod (29). Both sides of the movable block (28) are connected to tapered plug rods (31) extending to the gap between the battery packs (30), and one end of the movable block (28) and the inner wall of the battery box (27) are connected by a third spring (32). Both ends of the battery pack (30) are provided with positioning holes disposed on the inner wall of the battery box (27), and both ends of the outside of the battery pack (30) are provided with limit plates (33) disposed on the inner wall of the battery box (27). The battery pack (30) is mounted on the fan (34) at the air outlet of the box (2) by means of electrical connection.

6. The multi-channel anti-pollution switching device of the VOCs sampling device according to claim 5, characterized in that: One end of the hook rod (29) movably contacts a guide plate (35) disposed at both ends of the air outlet, and the guide plate (35) is movably connected to the inner wall of the box body (2) via a rotating shaft.

7. The multi-channel anti-pollution switching device of the VOCs sampling device according to claim 6, characterized in that: A heater (36) disposed on the inner wall of the box body (2) is provided between the panel (9) and the activated carbon plate (4), and a heating cavity is formed between the heater (36) and the inner wall of the box body (2).

8. A multi-channel anti-pollution switching method for a VOCs sampling device, applied to the multi-channel anti-pollution switching device for a VOCs sampling device according to claim 7, characterized in that: The steps include: S1.

1. VOCs pollutants are transported into the box (2) through the three-way solenoid valve outside the air inlet. At this time, the heater (36) is started and controls the temperature inside the box (2). The activated carbon plate (4) is rotated so that the arc-shaped protrusion (6) on the activated carbon plate (4) is rotated and separated from the first lifting rod (7) and the second lifting rod (12); S1.

2. During step S1.1, the first lifting rod (7) moves upward under the action of elastic recovery and drives the panel (9) to separate from the air inlet. The second lifting rod (12) drives the sealing plates (21) at both ends to move toward the center and close the heating chamber under the action of mechanical transmission. S1.

3. When the panel (9) moves upward, the volume of the heating chamber is compressed and the temperature rises, thereby compensating for the heat loss of the heating chamber in the box (2) due to heat conduction, thereby regulating the internal temperature of the heating chamber and preventing the liquefaction of VOCs pollutants.

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