Motor vehicle exhaust pollution monitoring system and purification device thereof

Abstract

The invention discloses a motor vehicle exhaust pollution monitoring system and a purification device thereof, and relates to the technical field of automobile accessories, the motor vehicle exhaust pollution monitoring system comprises a monitoring system and a metal shell, the monitoring system comprises an exhaust gas sensor, an engine control unit, an exhaust aftertreatment system, a catalytic converter, a diagnosis and maintenance interface and a remote control platform; the metal shell comprises a first metal shell, a second metal shell, a first mounting flange, a second mounting flange, a third mounting flange and a fourth mounting flange, the first mounting flange is fixedly mounted at the left end of the first metal shell, and the second mounting flange is fixedly mounted at the right end of the second metal shell; the metal shell is arranged to be in a split type, rapid disassembly and assembly of a catalyst ceramic carrier in the catalytic converter are achieved, tools do not need to be used for assistance, limitation is small, operation is convenient and rapid, time and labor are saved, and practicability is high.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile accessories, and in particular to a motor vehicle exhaust pollution monitoring system and a purification device thereof. Background Art

[0002] Vehicle exhaust emissions refer to the emission of harmful gases such as CO, HC+NOx, PM, etc. from vehicle exhaust. The emission of these pollutants poses a serious threat to human health. The pollutants emitted from automobile exhaust include carbon monoxide and some other solid particles that have adverse effects on the human body, especially leaded gasoline, which is more harmful to the human body. Lead is in the form of particles in the exhaust gas and spreads with the wind. Gasoline is mainly composed of carbon and hydrogen. When gasoline burns normally, it produces substances such as carbon dioxide, water vapor and excess oxygen. However, since the fuel contains other impurities and additives, and the fuel is often not completely burned, some harmful substances are often emitted. The composition of automobile exhaust is very complex, with more than 100 kinds of components. Its main pollutants include carbon monoxide, hydrocarbons and nitrogen oxides. Therefore, countries and regions are working hard to take measures to limit automobile exhaust emissions to reduce the adverse effects on the environment and human health. These measures include using cleaner fuels, promoting electric vehicles, implementing vehicle exhaust emission standards, and encouraging public transportation and non-motorized transportation.

[0003] In the prior art, the existing three-way catalytic converter is generally composed of a metal shell and a catalyst ceramic carrier, and they are all welded in one piece. If the catalyst ceramic carrier needs to be cleaned or replaced, the metal shell needs to be cut and destroyed, which is time-consuming and labor-intensive, and can easily damage the catalyst ceramic carrier, making it inconvenient to clean and replace the catalyst ceramic carrier. For this reason, we propose a motor vehicle exhaust pollution monitoring system and its purification device to solve the above problems. Summary of the Invention

[0004] The purpose of the present application is to provide a motor vehicle exhaust pollution monitoring system and a purification device thereof, so as to solve the problem that the three-way catalytic converter proposed in the above background technology is generally composed of a metal shell and a catalyst ceramic carrier, and they are all welded as one piece. If the catalyst ceramic carrier needs to be cleaned or replaced, the metal shell needs to be cut and destroyed, which is time-consuming and labor-intensive, and can easily damage the catalyst ceramic carrier, making it inconvenient to clean and replace the catalyst ceramic carrier.

[0005] To achieve the above objectives, the present application provides the following technical solutions: a motor vehicle exhaust pollution monitoring system and purification device thereof, comprising a monitoring system and a metal housing, wherein the monitoring system includes: an exhaust gas sensor, an engine control unit, an exhaust after-treatment system, a catalytic converter, a diagnostic and maintenance interface, and a remote control platform;

[0006] The metal shell includes: a first metal shell, a second metal shell, a first mounting flange, a second mounting flange, a third mounting flange and a fourth mounting flange, the first mounting flange is fixedly mounted on the left end of the first metal shell, the second mounting flange is fixedly mounted on the right end of the second metal shell, the third mounting flange is fixedly mounted on the right end of the first metal shell, the fourth mounting flange is fixedly mounted on the left end of the second metal shell, and the third mounting flange cooperates with the fourth mounting flange;

[0007] A fixing ring, the fixing ring is fixedly sleeved on the second metal shell, a plurality of fixing rods are rotatably connected to the left side of the fixing ring in an annular manner with equal intervals, a plurality of adapter slots are opened in an annular manner with equal intervals on the third mounting flange, and the fixing rods are clamped into the corresponding adapter slots;

[0008] The disassembly assembly is arranged on the second metal shell and cooperates with the fixing ring.

[0009] With the above structure, by setting up a detachable separation between the first metal shell and the second metal shell, and by fixing the clamping limit between the clamping rod and the adapter slot on the third mounting flange, the first metal shell and the second metal shell can be easily disassembled and assembled, thereby facilitating the disassembly, cleaning or replacement of the catalyst ceramic carrier inside, greatly improving the maintenance efficiency of the catalyst ceramic carrier.

[0010] Preferably, a flange sealing steel gasket is provided between the third mounting flange and the fourth mounting flange.

[0011] Furthermore, by providing a flange sealing gasket, the first metal shell and the second metal shell can be installed and sealed.

[0012] Preferably, a plurality of rectangular positioning rods are fixedly mounted on the left side of the fourth mounting flange, and a plurality of rectangular positioning holes are opened on the third mounting flange, and the left ends of the rectangular positioning rods can be detached and inserted into the corresponding rectangular positioning holes.

[0013] Furthermore, the insertion and limiting between the rectangular positioning rod and the rectangular positioning hole can facilitate the installation and positioning between the first metal shell and the second metal shell, thereby improving the installation stability and convenience.

[0014] Preferably, a plurality of first springs are fixedly mounted on the second metal shell at equal intervals in a ring shape, and one end of the first spring is fixedly mounted on a corresponding fixed clamping rod.

[0015] Furthermore, by providing the first spring, the fixed clamping rod can be driven to rotate and reset, thereby facilitating the clamping and fixing between the fixed clamping rod and the adapter slot on the third mounting flange.

[0016] Preferably, the disassembly and assembly components include multiple triangular limit blocks, adjusting nuts, multiple supporting slide rods, a movable ring, multiple transmission rods and multiple limit blocks. The triangular limit blocks are fixedly mounted on the corresponding fixed clamping rods, the adjusting nuts are threadedly sleeved on the second metal shell, the right ends of the multiple supporting slide rods are slidably connected to the left side of the adjusting nut, the movable ring is sleeved on the second metal shell, the right ends of the multiple transmission rods are fixedly mounted on the left side of the movable ring, the left ends of the multiple transmission rods pass through the fixed ring and are slidably connected to the fixed ring, the left end of the transmission rod contacts the corresponding triangular limit block, the limit block is fixedly mounted on the corresponding transmission rod, and the right side of the limit block contacts the left side of the fixed ring.

[0017] Furthermore, by rotating the adjusting nut and cooperating through the threaded connection between the adjusting nut and the second metal shell, the adjusting nut can be moved left or right on the second metal shell. At this time, the sliding limit cooperation between the supporting slide rod and the adjusting nut can drive the moving ring to move left or right. When the moving ring moves to the right, it can drive multiple transmission rods and multiple limit blocks to move right and release the extrusion limit of the transmission rod on the triangular limit block, so that the fixed clamping rod can be rotated and reset and completed with the clamping fixation between the adapter slot, thereby realizing the installation and fixation between the first metal shell and the second metal shell. When the moving ring moves to the left, it can drive multiple transmission rods and multiple limit blocks to move right, and the triangular limit block can be squeezed and limited by the transmission rod, which can drive the fixed clamping rod to rotate and release the clamping between the fixed clamping rod and the adapter slot, thereby facilitating the quick disassembly and assembly between the first metal shell and the second metal shell, thereby improving the convenience of disassembly and assembly between the first metal shell and the second metal shell.

[0018] Preferably, a thread groove is provided on the second metal shell, and the adjusting nut is threadably connected to the thread groove.

[0019] Furthermore, the thread groove can facilitate the connection and transmission between the adjusting nut and the second metal shell.

[0020] Preferably, an annular limiting groove is provided on the left side of the adjusting nut, and the right ends of the plurality of supporting slide rods are all slidably connected in the annular limiting groove.

[0021] Furthermore, by providing a sliding limit fit between the annular limit groove and the supporting slide rod, stable rotation support can be provided between the movable ring and the adjusting nut, and the sliding limit can enable the adjusting nut to drive the movable ring to move laterally.

[0022] Preferably, a second spring is sleeved on the transmission rod, the right end of the second spring is fixedly mounted on the left side of the movable ring, and the left end of the second spring is fixedly mounted on the right side of the fixed ring.

[0023] Furthermore, by providing a second spring, elastic support can be provided between the movable ring and the fixed ring.

[0024] The beneficial effects of the present invention are:

[0025] 1. By setting a detachable separation mode between the first metal shell and the second metal shell, and by the clamping limit between the fixed clamping rod and the adapter clamping groove on the third mounting flange, the first metal shell and the second metal shell can be easily disassembled and assembled, thereby facilitating the disassembly, cleaning or replacement of the catalyst ceramic carrier therein, greatly improving the maintenance efficiency of the catalyst ceramic carrier;

[0026] When the cam is in a closed position, the cam is engaged with the first and second metal shells, and the cam is engaged with the first and second metal shells, thereby realizing the quick disassembly and assembly between the first and second metal shells.

[0027] The present invention realizes the rapid disassembly and assembly of the catalyst ceramic carrier inside the catalytic converter by setting the metal shell as a split type without the need for tool assistance, has few limitations, is convenient and fast to operate, saves time and labor, and is highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a system block diagram of an embodiment of the present application;

[0029] Figure 2 This is a structural front view of an embodiment of the present application;

[0030] Figure 3 This is a main cross-sectional view of the structure of an embodiment of the present application;

[0031] Figure 4 Attached to the embodiment of this application Figure 3 Schematic diagram of the structure of part A;

[0032] Figure 5This is a three-dimensional structural diagram of the fixing ring, adjusting nut, annular limiting groove, supporting slide rod, movable ring, transmission rod, second spring and limiting block of an embodiment of the present application.

[0033] In the figure: 1. First metal shell; 2. Second metal shell; 3. First mounting flange; 4. Second mounting flange; 5. Third mounting flange; 6. Fourth mounting flange; 7. Flange sealing gasket; 8. Rectangular positioning rod; 9. Rectangular positioning hole; 10. Adapter slot; 11. Fixing ring; 12. Fixing rod; 13. First spring; 14. Triangular limit block; 15. Adjusting nut; 16. Threaded groove; 17. Annular limit groove; 18. Support slide rod; 19. Moving ring; 20. Transmission rod; 21. Second spring; 22. Limit block. DETAILED DESCRIPTION

[0034] The present invention will be further explained below with reference to specific embodiments.

[0035] refer to Figure 1-Figure 5 ,This embodiment proposes a motor vehicle exhaust pollution monitoring system and purification device thereof, including a monitoring system and a metal housing, the monitoring system including: an exhaust gas sensor, an engine control unit, an exhaust after-treatment system, a catalytic converter, a diagnosis and maintenance interface and a remote control platform;

[0036] The metal shell includes: a first metal shell 1, a second metal shell 2, a first mounting flange 3, a second mounting flange 4, a third mounting flange 5 and a fourth mounting flange 6. The first mounting flange 3 is fixedly mounted on the left end of the first metal shell 1, the second mounting flange 4 is fixedly mounted on the right end of the second metal shell 2, the third mounting flange 5 is fixedly mounted on the right end of the first metal shell 1, and the fourth mounting flange 6 is fixedly mounted on the left end of the second metal shell 2. The third mounting flange 5 cooperates with the fourth mounting flange 6.

[0037] The fixing ring 11 is fixedly sleeved on the second metal shell 2. The left side of the fixing ring 11 is rotatably connected to a plurality of fixing rods 12 at equal intervals. The third mounting flange 5 is provided with a plurality of adapter slots 10 at equal intervals. The fixing rods 12 are clamped into the corresponding adapter slots 10.

[0038] The disassembly assembly is arranged on the second metal shell 2 and matches with the fixing ring 11 .

[0039] By means of the above structure, by setting up a detachable separation between the first metal shell 1 and the second metal shell 2, and by fixing the clamping limit between the clamping rod 12 and the adapter slot 10 on the third mounting flange 5, the first metal shell 1 and the second metal shell 2 can be easily disassembled and assembled, thereby facilitating the disassembly, cleaning or replacement of the catalyst ceramic carrier inside, thereby greatly improving the maintenance efficiency of the catalyst ceramic carrier.

[0040] In this embodiment, a flange sealing gasket 7 is provided between the third mounting flange 5 and the fourth mounting flange 6 . The flange sealing gasket 7 can be used to seal the first metal shell 1 and the second metal shell 2 .

[0041] In this embodiment, a plurality of rectangular positioning rods 8 are fixedly installed on the left side of the fourth mounting flange 6, and a plurality of rectangular positioning holes 9 are opened on the third mounting flange 5. The left end of the rectangular positioning rod 8 can be detached and inserted into the corresponding rectangular positioning hole 9. Through the insertion and limiting between the rectangular positioning rod 8 and the rectangular positioning hole 9, the installation and positioning between the first metal shell 1 and the second metal shell 2 can be facilitated, thereby improving the installation stability and convenience.

[0042] In this embodiment, a plurality of first springs 13 are fixedly installed at equal intervals in a ring on the second metal shell 2, and one end of the first spring 13 is fixedly installed on the corresponding fixed clamping rod 12. By setting the first spring 13, the fixed clamping rod 12 can be driven to rotate and reset, so as to facilitate the clamping and fixing between the fixed clamping rod 12 and the adapter slot 10 on the third mounting flange 5.

[0043] In this embodiment, the disassembly and assembly components include a plurality of triangular limit blocks 14, an adjusting nut 15, a plurality of supporting slide bars 18, a movable ring 19, a plurality of transmission rods 20 and a plurality of limit blocks 22. The triangular limit blocks 14 are fixedly mounted on the corresponding fixed card rod 12, and the adjusting nut 15 is threadedly sleeved on the second metal shell 2. The right ends of the plurality of supporting slide bars 18 are slidably connected to the left side of the adjusting nut 15, and the movable ring 19 is sleeved on the second metal shell 2. The right ends of the plurality of transmission rods 20 are fixedly mounted on the left side of the movable ring 19, and the left ends of the plurality of transmission rods 20 pass through the fixed ring 11 and are slidably connected to the fixed ring 11. The left end of the transmission rod 20 contacts the corresponding triangular limit block 14, and the limit block 22 is fixedly mounted on the corresponding transmission rod 20. The right side of the limit block 22 contacts the left side of the fixed ring 11. By rotating the adjusting nut 15 and cooperating with the threaded connection between the adjusting nut 15 and the second metal shell 2, the adjusting nut 15 can be adjusted in the second metal shell When the movable ring 19 moves to the left or right, the movable ring 19 can be driven to move to the left or right through the sliding limit cooperation between the supporting slide rod 18 and the adjusting nut 15. When the movable ring 19 moves to the right, it can drive multiple transmission rods 20 and multiple limit blocks 22 to move to the right and release the extrusion limit of the transmission rod 20 on the triangular limit block 14, so that the fixed card rod 12 can be rotated and reset and completed with the card fixation between the adapter card slot 10, so as to realize the installation and fixation between the first metal shell 1 and the second metal shell 2. When the movable ring 19 moves to the left, it can drive multiple transmission rods 20 and multiple limit blocks 22 to move to the right and squeeze the triangular limit block 14 through the transmission rod 20, so as to drive the fixed card rod 12 to rotate and release the card fixation between the fixed card rod 12 and the adapter card slot 10, thereby facilitating the quick disassembly and assembly between the first metal shell 1 and the second metal shell 2, thereby improving the convenience of disassembly and assembly between the first metal shell 1 and the second metal shell 2.

[0044] In this embodiment, a thread groove 16 is provided on the second metal shell 2 , and the adjusting nut 15 is threadedly connected to the thread groove 16 . The thread groove 16 facilitates connection and transmission between the adjusting nut 15 and the second metal shell 2 .

[0045] In this embodiment, an annular limit groove 17 is provided on the left side of the adjusting nut 15, and the right ends of multiple supporting slides 18 are all slidably connected in the annular limit groove 17. By providing a sliding limit between the annular limit groove 17 and the supporting slides 18, stable rotation support can be provided between the moving ring 19 and the adjusting nut 15, and the sliding limit can enable the adjusting nut 15 to drive the moving ring 19 to move laterally.

[0046] In this embodiment, a second spring 21 is sleeved on the transmission rod 20, the right end of the second spring 21 is fixedly mounted on the left side of the movable ring 19, and the left end of the second spring 21 is fixedly mounted on the right side of the fixed ring 11. By providing the second spring 21, elastic support can be provided between the movable ring 19 and the fixed ring 11.

[0047] In this embodiment, the exhaust gas sensor is used to detect the gas composition in the exhaust system, ensure that the engine's emissions meet environmental standards, optimize combustion efficiency, and protect the environment. According to the working principle and purpose of the sensor, it generally includes: an oxygen sensor (mainly used to detect the oxygen content in the exhaust. This type of sensor helps the engine control unit adjust the fuel mixture ratio to ensure that the engine runs in the optimal combustion state, thereby improving combustion efficiency and reducing emissions), a nitrogen oxide sensor (used to measure the concentration of nitrogen oxides in the exhaust), a CO sensor (used to detect the concentration of carbon monoxide in the exhaust), an HC sensor (used to detect unburned hydrocarbons in the exhaust), a temperature sensor (used to monitor the temperature of the gas in the exhaust system. Exhaust temperature is crucial to engine performance and emission control, because high temperature may cause damage to the catalytic converter, while low temperature may cause reduced efficiency of the catalytic converter), a catalytic converter efficiency sensor (usually installed at the inlet and outlet of the exhaust system to detect whether the catalytic converter is working properly. The function of the catalytic converter is to convert harmful gases into harmless gases) and an oxygen sensor. Carbon monoxide and nitrogen oxide mixed sensor (capable of simultaneously detecting the concentrations of carbon monoxide and nitrogen oxides, thereby providing a variety of data support for the vehicle's emission system, helping to control the combustion process and reduce emissions); the engine control unit ECU, whose function is to continuously optimize the combustion process, reduce incomplete combustion, and reduce the emission of harmful gases (such as carbon monoxide, nitrogen oxides, hydrocarbons, etc.), helping the vehicle meet emission standards; the emission after-treatment system is designed to reduce harmful emissions produced by the engine and ensure that emissions meet environmental standards; the catalytic converter is one of the core components of the emission after-treatment system, mainly used to convert harmful substances in exhaust gas into harmless gases; diagnostic and maintenance interface For vehicles that comply with emission regulations, the diagnostic interface can be used to check the operating status of the emission control system, such as the working status of the catalytic converter, SCR system, DPF, etc.; the remote control platform is a technical platform for remote management, control and monitoring of equipment or systems through the network or other communication means. Such platforms are widely used in different fields, including IT system management, industrial automation, home intelligence, vehicle management and medical equipment.

[0048] Working principle: When in use, first, by setting a detachable separation mode between the first metal shell 1 and the second metal shell 2, and by fixing the clamping limit between the clamping rod 12 and the adapter slot 10 on the third mounting flange 5, the first metal shell 1 and the second metal shell 2 can be easily disassembled and assembled, thereby facilitating the disassembly, cleaning or replacement of the catalyst ceramic carrier inside, greatly improving the maintenance efficiency of the catalyst ceramic carrier, and at the same time, by rotating the adjusting nut 15 and through the threaded connection between the adjusting nut 15 and the second metal shell 2, the adjusting nut 15 can be moved left or right on the second metal shell 2, and at this time, the sliding limit cooperation between the supporting slide rod 18 and the adjusting nut 15 can drive the moving ring 19 to move left or right, and when the moving ring 19 moves to the right, it can drive multiple transmission rods 20 and multiple limit blocks 22 to move right and release the transmission rod 20 from the triangular limit block 14 The extrusion limit can make the fixed card rod 12 rotate and reset and complete the clamping and fixing between the adapter card slot 10, so that the installation and fixation between the first metal shell 1 and the second metal shell 2 can be realized. When the movable ring 19 moves to the left, it can drive multiple transmission rods 20 and multiple limit blocks 22 to move right and squeeze and limit the triangular limit block 14 through the transmission rod 20, which can drive the fixed card rod 12 to rotate and release the clamping between the fixed card rod 12 and the adapter card slot 10, thereby facilitating the rapid disassembly and assembly between the first metal shell 1 and the second metal shell 2. In this way, the convenience of disassembly and assembly between the first metal shell 1 and the second metal shell 2 is improved. Finally, by setting the first metal shell 1 and the second metal shell 2 to be split, the catalyst ceramic carrier inside the catalytic converter is quickly disassembled and assembled without the use of tools. It has small limitations, is easy and quick to operate, saves time and effort, and is highly practical.

[0049] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A motor vehicle exhaust pollution monitoring system and purification device thereof, comprising a monitoring system and a metal housing, characterized in that: The monitoring system includes: exhaust gas sensors, engine control unit, exhaust after-treatment system, diagnosis and maintenance interface and remote control platform; The metal shell comprises: a first metal shell (1), a second metal shell (2), a first mounting flange (3), a second mounting flange (4), a third mounting flange (5) and a fourth mounting flange (6), wherein the first mounting flange (3) is fixedly mounted on the left end of the first metal shell (1), the second mounting flange (4) is fixedly mounted on the right end of the second metal shell (2), the third mounting flange (5) is fixedly mounted on the right end of the first metal shell (1), the fourth mounting flange (6) is fixedly mounted on the left end of the second metal shell (2), and the third mounting flange (5) and the fourth mounting flange (6) are matched; A fixing ring (11) is fixedly sleeved on the second metal shell (2); a plurality of fixing rods (12) are rotatably connected to the left side of the fixing ring (11) at equal intervals in an annular manner; a plurality of adapting slots (10) are formed at equal intervals in an annular manner on the third mounting flange (5); the fixing rods (12) are clamped into the corresponding adapting slots (10); A disassembly assembly is provided on the second metal shell (2), and the disassembly assembly cooperates with the fixing ring (11).

2. A motor vehicle exhaust pollution monitoring system and purification device according to claim 1, characterized in that: A flange sealing steel gasket (7) is provided between the third mounting flange (5) and the fourth mounting flange (6).

3. A motor vehicle exhaust pollution monitoring system and purification device according to claim 1, characterized in that: A plurality of rectangular positioning rods (8) are fixedly mounted on the left side of the fourth mounting flange (6), and a plurality of rectangular positioning holes (9) are opened on the third mounting flange (5). The left ends of the rectangular positioning rods (8) can be detached and inserted into the corresponding rectangular positioning holes (9).

4. A motor vehicle exhaust pollution monitoring system and purification device according to claim 1, characterized in that: A plurality of first springs (13) are fixedly mounted on the second metal shell (2) at equal intervals in an annular manner, and one end of the first spring (13) is fixedly mounted on a corresponding fixed clamping rod (12).

5. The vehicle exhaust pollution monitoring system and purification device according to claim 1, characterized in that: The disassembly and assembly components include a plurality of triangular limit blocks (14), an adjusting nut (15), a plurality of supporting slide bars (18), a moving ring (19), a plurality of transmission rods (20) and a plurality of limit blocks (22). The triangular limit blocks (14) are fixedly mounted on the corresponding fixed clamping rod (12). The adjusting nut (15) is threadedly sleeved on the second metal shell (2). The right ends of the plurality of supporting slide bars (18) are slidably connected to the left side of the adjusting nut (15). The moving ring (19) is sleeved on the second metal shell (2). The right ends of the plurality of transmission rods (20) are fixedly mounted on the left side of the moving ring (19). The left ends of the plurality of transmission rods (20) pass through the fixed ring (11) and are slidably connected to the fixed ring (11). The left ends of the transmission rods (20) are in contact with the corresponding triangular limit blocks (14). The limit blocks (22) are fixedly mounted on the corresponding transmission rods (20). The right side of the limit blocks (22) is in contact with the left side of the fixed ring (11).

6. A motor vehicle exhaust pollution monitoring system and purification device according to claim 5, characterized in that: A thread groove (16) is provided on the second metal shell (2), and the adjusting nut (15) is threadedly connected to the thread groove (16).

7. A motor vehicle exhaust pollution monitoring system and purification device according to claim 5, characterized in that: An annular limiting groove (17) is provided on the left side of the adjusting nut (15), and the right ends of the plurality of supporting slide rods (18) are all slidably connected in the annular limiting groove (17).

8. The vehicle exhaust pollution monitoring system and purification device according to claim 5, characterized in that: The transmission rod (20) is sleeved with a second spring (21), the right end of the second spring (21) is fixedly mounted on the left side of the movable ring (19), and the left end of the second spring (21) is fixedly mounted on the right side of the fixed ring (11).

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