Flue gas purification device and method in asphalt mixture production

Abstract

The present application provides a flue gas purification device and method in asphalt mixture production, an electrostatic precipitator body and conduit, a pouring trough, an anode plate body, a mounting baffle and a filter bag. The present application operates the output shaft of a drive motor to rotate and drive the threaded rod to rotate, so that the threaded rod can thread the moving plate to move linearly. At this time, the moving plate can drive the scraper to scrape the dust on the surface of the anode plate body, and the two scrapers are distributed in an eight-shaped pattern, which can guide the dust on the surface of the anode plate body while scraping it to avoid dust accumulation on the surface of the scraper. At the same time, when the anode plate body is damaged and needs to be replaced, the fixed plate can be started to generate a pulling force to drive the second connecting plate to expand at a smaller angle, so that the fixed block is pulled to flip inward. At this time, the anode plate body can be moved out of the electrostatic precipitator body by moving the moving plate upward, so that the anode plate body can be replaced, achieving the effect of scraping and cleaning the anode plate body.

Description

Technical Field

[0001] The present invention relates to the field of flue gas purification, and in particular to a flue gas purification device and method in asphalt mixture production. Background Art

[0002] In the production process of asphalt mixture, a large amount of dust and flue gas will be generated due to the heating and stirring of asphalt. These flue gases contain a variety of organic substances, such as polycyclic aromatic hydrocarbons such as benzopyrene, benzanthracene, and carbazole. These substances cause serious harm to human health and the environment, especially in the field of asphalt mixing. A large amount of dust-containing gas will be generated. In order to effectively purify these gases, electrostatic precipitators are widely used. Electrostatic precipitators use high-voltage electric fields to ionize gases, thereby charging dust and collecting it by electrode adsorption; however, in the long-term operation of existing electrostatic precipitators, the problem of dust accumulation on the anode plates has gradually become prominent. As dust continues to accumulate on the anode plates, the discharge effects of the positive and negative plates will be weakened, and the dust removal efficiency will be reduced. This not only affects the normal operation and purification effect of the equipment, but also causes a series of faults, such as electrode short circuit, reduced insulation performance, etc. In addition, dust accumulation will increase the maintenance cost and workload of the equipment, requiring frequent shutdowns for cleaning, which seriously affects production efficiency.

[0003] For example, the Chinese invention patent (application number: CN102743951A) discloses a method and device for purifying asphalt smoke. The specification discloses: 1. The pipe section before the reactor accounts for the vast majority of the system pipeline length, and heating alone cannot achieve a good purification effect. Asphalt will adhere to the branch pipe in liquid form. The longer the pipe wall is, the thicker it will accumulate, which seriously affects the flue gas flow, reduces the system's efficiency in capturing asphalt smoke, and causes asphalt smoke to overflow and pollute the environment. In addition, these adhesives need to be cleaned regularly, otherwise the branch pipe will directly cause system failure after being blocked, and the cleaning workload for this problem is quite large. Moreover, this problem is particularly serious for the ventilation pipe of the intermittent kneading machine. The intermittent dust and asphalt smoke in the flue gas aggravate the adhesion of tar on the pipe wall; 2. The water content in the exhaust gas of the cooler and kneader is relatively high. The high-temperature water vapor in the flue gas will condense into water after contacting the pipe wall with a lower temperature, which will cause the system to be damp, making the carbon powder in the pipe easy to stick and clog, and even causing liquid pollutants to be generated in the system. Therefore, the effect of the existing flue gas purification method of adding carbon powder into the reactor to adsorb asphalt flue gas is still not ideal; the above patent can prove the defects of the existing technology.

[0004] Therefore, we have made improvements to this and proposed a flue gas purification device and method in asphalt mixture production. Summary of the invention

[0005] The purpose of the present invention is to make improvements on the problem of dust accumulation on the anode plates of the existing electrostatic precipitator during long-term operation, in which the discharge effect is weakened and the dust removal efficiency is reduced as the dust continues to accumulate on the anode plates.

[0006] In order to achieve the above-mentioned purpose of the invention, the present invention provides the following flue gas purification device in asphalt mixture production to improve the above-mentioned problems.

[0007] The specific application is as follows:

[0008] The flue gas purification device in asphalt mixture production includes an electrostatic precipitator body and a conduit, a pouring trough, an anode plate body, a mounting baffle and a filter bag, wherein the conduit is fixedly connected to both sides of the surface of the electrostatic precipitator body, the pouring trough is symmetrically fixedly connected to the bottom surface of the electrostatic precipitator body, the anode plate body is arranged in the electrostatic precipitator body, the upper surface of the anode plate body is fixedly connected with a mounting baffle, the mounting baffle is fixed to the electrostatic precipitator body by bolts, the filter bag is symmetrically fixedly connected in the electrostatic precipitator body, a cleaning component for improving the conductive cleaning surface is arranged in the electrostatic precipitator body, and a toggle component for promoting dust detachment and improving air permeability is arranged in the electrostatic precipitator body.

[0009] As a preferred technical solution of the present application, the cleaning component includes a scraper, which is symmetrically arranged on both sides of the anode plate body, and the two scrapers are distributed in an eight-shaped shape. Fixed blocks are fixedly connected on both sides of the scraper, and a movable plate is arranged on the side of the fixed block away from the scraper. The number of the movable plates is four, and the surfaces of the four movable plates are threadedly connected with threaded rods. The upper surface of the electrostatic precipitator body is fixedly connected with a drive motor, and the output end of the drive motor is fixedly connected to a single threaded rod. The top ends of the four threaded rods pass through the surface of the electrostatic precipitator body, and the top ends of the four threaded rods are fixedly connected with a transmission component.

[0010] As a preferred technical solution of the present application, the cleaning component also includes a first connecting plate, which is fixedly connected between the facing surfaces of the two movable plates, a bracket is fixedly connected to the surface of the first connecting plate, an electric telescopic rod is fixedly connected to the upper surface of the bracket, and a fixed plate is fixedly connected to the output end of the electric telescopic rod, a second connecting plate is symmetrically hinged on the lower surface of the fixed plate close to the anode plate body, the second connecting plate is hingedly connected to the fixed block at one end away from the fixed plate, a mounting block is fixedly connected to the lower surface of the second connecting plate, a scraping belt is fixedly connected between the facing surfaces of the two mounting blocks, and a hollow plate is symmetrically fixedly connected to the top surface of the inner wall of the electrostatic precipitator body.

[0011] The cam is an axially coupled plate of the second filter bag, wherein the second coupling member is pivotally connected to the second support frame, and the coupling member is pivotally connected to the second support frame.

[0012] As a preferred technical solution of the present application, the transmission assembly is composed of a pulley and a transmission belt, the belt is fixedly connected to the threaded rod, and the transmission belt is transmission-sleeved to the surface of the pulley.

[0013] As a preferred technical solution of the present application, an installation groove is provided on the surface of one side of the fixed block close to the movable plate, a connecting rod is rotatably connected in the installation groove, one end of the connecting rod away from the fixed block is fixedly connected to the movable plate, a torsion spring is sleeved on the surface of the connecting rod, and both ends of the torsion spring are respectively fixedly connected to the fixed block and the movable plate.

[0014] As a preferred technical solution of the present application, a sensing head is fixedly connected to the upper surface of the fixed plate, and the sensing head is composed of a thickness sensor and a resistance sensor.

[0015] As a preferred technical solution of the present application, magnetic blocks are symmetrically fixedly connected between the facing surfaces of the scraper belt and the second connecting plate, and the second connecting plate is magnetically attracted to the magnetic blocks on the surface of the scraper belt.

[0016] As a preferred technical solution of the present application, the bottom surface of the hollow plate is evenly fixedly connected to an air gun head, the upper surface of the hollow plate is fixedly connected to a connecting pipe, the surface of the connecting pipe is fixedly connected to a one-way valve, the end of the connecting pipe away from the one-way valve is fixedly connected to an air compressor, and the top surface of the electrostatic precipitator body is fixedly provided with a push switch located on the facing side of the two hollow plates.

[0017] A flue gas purification method in asphalt mixture production, which uses a comprehensive atmospheric sampling device and an online monitoring sampling device to collect and sample pollutants, and the comprehensive atmospheric sampling device collects gas at a specified flow rate for 45 minutes to 60 minutes, including the following steps;

[0018] S1. The non-production area in the wind direction above the mixing building is used as the background point, and the area below the mixing building discharge port is used as the test point. The pollutants are collected and sampled using a comprehensive atmospheric sampling device and an online monitoring sampling device. The pollutants collected by the comprehensive atmospheric sampling device are sent to the laboratory for testing, and the online monitoring sampling device outputs data in real time.

[0019] S2. When collecting pollutants below the discharge port, select a measuring point at the center of each side of the rectangular discharge port but not in contact with the mixture to reduce the influence of the atmosphere and wind speed on the test results. Sampling of pollutants is carried out after the production of asphalt mixture is stable. The test begins after 2 trucks of material are discharged. Each test position is tested once, and then the average value is taken as the test result, and the result is used as the calibration data;

[0020] S3. An online monitoring device is installed below the discharge port, which can automatically record the test data. When the results are output, the test value of the comprehensive atmospheric collection device is used as the calibration of the data fluctuation, thereby determining the maximum concentration value of pollutant emissions of a certain type of asphalt mixture at the discharge port;

[0021] S4. Install a comprehensive atmospheric collection device in the non-production area in the wind direction above the mixing building. Start the test after the asphalt mixture is in stable production. Take the sample once and take the average value as the test result, which is used as the calibration data.

[0022] S5. Install an online monitoring device in the non-production area in the wind direction above the mixing building. When outputting the results, use the test value of the comprehensive atmospheric collection device as the calibration of data fluctuations, thereby determining the minimum concentration value of pollutant emissions at the background point during asphalt mixture production;

[0023] S6. The ratio of the maximum pollutant concentration at the discharge port to the minimum pollutant concentration at the background point is used as an evaluation indicator for the pollutant emission level in the asphalt mixture production process.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] In the scheme of this application:

[0026] 1. In order to solve the problem of dust accumulation on the surface of the anode plate body in the prior art, which leads to weakened discharge effect and reduced dust reduction efficiency, the present application drives the threaded rod to rotate by operating the output shaft of the driving motor, so that the threaded rod can threadably drive the moving plate to move linearly. At this time, the moving plate can drive the scraper to scrape the dust on the surface of the anode plate body, and the two scrapers are arranged in an eight-shaped distribution, which can guide the dust on the surface of the anode plate body while scraping it, so as to avoid dust accumulation on the surface of the scraper. At the same time, when the anode plate body is damaged and needs to be replaced, the fixed plate can be started to generate a pulling force to drive the second connecting plate to have a smaller expansion angle, so that the fixed block is pulled to flip inward, so that the moving plate tilted in the eight-shaped in the initial state can be horizontal with the anode plate body. At this time, the anode plate body can be driven out of the electrostatic precipitator body by moving the moving plate upward, so that the anode plate body can be replaced, thereby achieving the effect of scraping and cleaning the anode plate body and improving the dust reduction efficiency of the anode plate body.

[0027] 2. In order to solve the problem in the prior art that the filter bag is deformed by the impact of pressure and airflow after long-term use, and dust gradually accumulates on the filter bag, resulting in poor air permeability, the present application provides a paddle plate in cooperation with the driving of the rotating rod. When the movable plate moves up and down, the paddle block is driven to push the rotating rod, so that the paddle plate rises and tilts down. At this time, the paddle plate can cooperate with the convex block to slap and press the filter bag. Then, in the process of the gradual upward movement of the movable plate, the paddle block can cancel the fit with the rotating rod. At this time, the paddle plate is gradually reset by the pushing force of the supporting spring. The elastic force of the supporting spring can apply pressure to the surface of the paddle plate, so that the paddle plate intermittently slaps the surface of the filter bag, and part of the dust attached to the filter bag is slapped and falls off, thereby achieving the effect of slapping the filter bag to reduce dust accumulation, and the filter bag is subjected to the slapping force to avoid deformation caused by the influence of dust.

[0028] 3. The air compressor and the push switch cooperate with each other. When the movable plate moves to the top surface of the inner wall of the electrostatic precipitator body, the movable plate can apply force to squeeze the button of the push switch to connect the force current. The signal given by the push switch starts the operation of the air compressor. The air compressor sucks in air and compresses it into the connecting pipe. The connecting pipe is then opened and transmitted to the hollow plate, and sprayed to the anode plate body and the scraper surface located above the anode plate body through the air gun head. Then, the dust particles that have not fallen off the scraper and the surface of the anode plate body can be impacted and dropped, thereby improving the cleaning effect of the scraper on the anode plate body and avoiding the situation that the impurities attached to the gaps on the surface of the anode plate body are difficult to handle;

[0029] 4. The surface of the filter bag is slapped in cooperation with the paddle plate by the provided convex blocks, so that when the paddle plate contacts and slaps the surface of the filter bag, the slapping effect on the filter bag can be improved through the convex blocks. The convex blocks can make the paddle plate apply force more concentratedly when slapping, thereby increasing the impact force on the filter bag, thereby more effectively shaking off the dust on the filter bag, which is beneficial to extending the service life of the filter bag and avoiding deformation of the filter bag due to dust accumulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of the structure of a flue gas purification device in asphalt mixture production provided in this application;

[0031] Figure 2 This is a schematic diagram of the overall vertical cross-sectional structure of the flue gas purification device in the asphalt mixture production provided in this application;

[0032] Figure 3 Provided for this application Figure 2 The enlarged structural diagram at A in the middle;

[0033] Figure 4 A schematic diagram of a partial vertical cross-sectional structure of a cleaning component of a flue gas purification device in asphalt mixture production provided in the present application;

[0034] Figure 5 A schematic diagram of the structure of an air gun head of a flue gas purification device in asphalt mixture production provided in this application;

[0035] Figure 6 A schematic diagram of the scraper structure of the flue gas purification device in the asphalt mixture production provided in this application;

[0036] Figure 7 A schematic diagram of the partial structure of the cleaning component of the flue gas purification device in the asphalt mixture production provided in this application;

[0037] Figure 8 A schematic diagram of the torsion spring structure of the flue gas purification device in the asphalt mixture production provided in this application;

[0038] Fig. 9 A schematic diagram of the scraping belt structure of the flue gas purification device in asphalt mixture production provided in this application.

[0039] Fig.10 A schematic diagram of the structure of the toggle assembly of the flue gas purification device in asphalt mixture production provided in this application.

[0040] Indicated in the figure:

[0041] 1. Electrostatic precipitator body; 2. Conduit; 3. Discharge chute; 4. Anode plate body; 401. Mounting baffle; 5. Filter bag;

[0042] Cleaning components: 6, scraper; 7, fixed block; 8, moving plate; 9, threaded rod; 10, drive motor; 11, transmission component; 12, mounting slot; 13, connecting rod; 14, torsion spring; 15, first connecting plate; 16, bracket; 17, electric telescopic rod; 18, fixed plate; 19, second connecting plate; 20, induction head; 21, mounting block; 22, scraping belt; 23, magnetic block; 24, hollow plate; 25, air gun head; 26, connecting pipe; 27, one-way valve; 28, air compressor; 29, push switch;

[0043] Toggle assembly: 30, mounting plate; 31, second support plate; 32, placement slot; 33, toggle plate; 34, support spring; 35, rotating rod; 351, toggle block; 36, protrusion. DETAILED DESCRIPTION

[0044] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0045] As described in the background technology, during the long-term operation of the electrostatic precipitator, the problem of dust accumulation on the anode plates gradually becomes prominent. As dust continues to accumulate on the anode plates, the discharge effect of the positive and negative plates will be weakened, and the dust removal efficiency will be reduced.

[0046] In order to solve this technical problem, the present invention provides a fume purification device and method in asphalt mixture production, which is applied to scraping and cleaning the surface of anode plates.

[0047] Specifically, please refer to Figure 1-Figure 9 , a flue gas purification device in asphalt mixture production, comprising an electrostatic precipitator body 1 and a conduit 2, a pouring trough 3, an anode plate body 4, a mounting baffle 401 and a filter bag 5, wherein the conduit 2 is fixedly connected to both sides of the surface of the electrostatic precipitator body 1, the pouring trough 3 is symmetrically fixedly connected to the bottom surface of the electrostatic precipitator body 1, the anode plate body 4 is arranged in the electrostatic precipitator body 1, the upper surface of the anode plate body 4 is fixedly connected with a mounting baffle 401, the mounting baffle 401 is fixed to the electrostatic precipitator body 1 by bolts, the filter bag 5 is symmetrically fixedly connected in the electrostatic precipitator body 1, a cleaning component for improving the conductive cleaning surface is arranged in the electrostatic precipitator body 1, and a toggle component for promoting dust detachment and improving air permeability is arranged in the electrostatic precipitator body 1:

[0048] The cleaning assembly includes a scraper 6, which is symmetrically arranged on both sides of the anode plate body 4, and the two scrapers 6 are distributed in an eight-shaped shape. Fixed blocks 7 are fixedly connected to both sides of the scraper 6. A movable plate 8 is arranged on the side of the fixed block 7 away from the scraper 6. The number of movable plates 8 is four, and the surfaces of the four movable plates 8 are all threadedly connected with threaded rods 9. The upper surface of the electrostatic precipitator body 1 is fixedly connected with a drive motor 10, and the output end of the drive motor 10 is fixedly connected to a single threaded rod 9. The top ends of the four threaded rods 9 all penetrate the electrostatic precipitator body 1. The top of the four threaded rods 9 is fixedly connected with a transmission assembly 11, which is composed of a pulley and a transmission belt. The belt is fixedly connected to the threaded rod 9, and the transmission belt is sleeved to the surface of the pulley. A mounting groove 12 is provided on the surface of the fixed block 7 close to the movable plate 8. A connecting rod 13 is rotatably connected in the mounting groove 12. The end of the connecting rod 13 away from the fixed block 7 is fixedly connected to the movable plate 8. A torsion spring 14 is sleeved on the surface of the connecting rod 13, and the two ends of the torsion spring 14 are respectively fixedly connected to the fixed block 7 and the movable plate 8;

[0049] The cleaning assembly also includes a first connecting plate 15, which is fixedly connected between the facing surfaces of the two movable plates 8. A bracket 16 is fixedly connected to the surface of the first connecting plate 15, and an electric telescopic rod 17 is fixedly connected to the upper surface of the bracket 16. The output end of the electric telescopic rod 17 is fixedly connected to a fixed plate 18, and an induction head 20 is fixedly connected to the upper surface of the fixed plate 18. The induction head 20 is composed of a thickness sensor and a resistance sensor. A second connecting plate 19 is symmetrically hinged on the lower surface of the fixed plate 18 on one side close to the anode plate body 4. The end of the second connecting plate 19 away from the fixed plate 18 is hingedly connected to the fixed block 7, and a mounting block 21 is fixedly connected to the lower surface of the second connecting plate 19. The two mounting blocks 21 are fixedly connected to the lower surface of the second connecting plate 19. A scraping belt 22 is fixedly connected between the facing surfaces of the mounting block 21, and magnetic blocks 23 are symmetrically fixedly connected between the scraping belt 22 and the facing surfaces of the second connecting plate 19, and the second connecting plate 19 is magnetically attracted to the magnetic blocks 23 on the surface of the scraping belt 22, and a hollow plate 24 is symmetrically fixedly connected to the top surface of the inner wall of the electrostatic precipitator body 1, and an air gun head 25 is evenly fixedly connected to the bottom surface of the hollow plate 24, and a connecting pipe 26 is fixedly connected to the upper surface of the hollow plate 24, and a one-way valve 27 is fixedly connected to the surface of the connecting pipe 26, and an air compressor 28 is fixedly connected to the end of the connecting pipe 26 away from the one-way valve 27, and a push switch 29 located on the side of the facing surfaces of the two hollow plates 24 is fixed on the top surface of the electrostatic precipitator body 1.

[0050] The fume purification device in asphalt mixture production provided by the present invention starts the driving motor 10 to operate, so that the output shaft of the driving motor 10 rotates to drive the connected threaded rod 9 to rotate. When the threaded rod 9 fixed to the output shaft of the driving motor 10 is driven, it can cooperate with the pulley of the transmission assembly 11 and the transmission belt to drive the other three threaded rods 9 to rotate uniformly. At this time, when the threaded rods 9 rotate uniformly, the threaded transmission movable plate 8 is limited when the threaded transmission force is received, so that in the initial state, the movable plates 8 located below the two sides of the anode plate body 4 are driven by the transmission force. Then the moving plate 8 can present an up and down linear movement. In the process of the moving plate 8 moving, the fixed block 7 can drive the scraper 6 to scrape the dust particles adsorbed on the surface of the anode plate body 4. Since the two scrapers 6 are arranged in an eight-shaped shape, the scraper 6 moving upward can guide the particles and dust scraped on the surface of the anode plate body 4, so that the scraped dust can fall to both sides through the scrapers 6 arranged in the eight-shaped shape, and when the scraper 6 moves downward, the particles can be conveniently guided to the lower surface and fall into the pouring trough 3 for processing, and the fixed block 7 drives the scraper 6 to move. At the same time, the scraping belt 22 is in close contact with the side surface of the anode plate body 4, so that the scraping belt 22 can cooperate with the scraper 6 to scrape the side of the anode plate body 4 when moving. At the same time, when the moving plate 8 moves to the top surface of the inner wall of the electrostatic precipitator body 1, the moving plate 8 at this time can apply force to squeeze the button of the press switch 29. As the button continues to be stressed, the originally separated electric contacts will contact each other, thereby connecting the circuit, and the current can be transmitted to the air compressor 28 through the trigger transmission signal of the switch. Then, after the air compressor 28 is turned on, air can be sucked in for compression. The air is then transferred into the connecting tube 26, which is then opened and transmitted into the hollow plate 24, and sprayed to the anode plate body 4 and the surface of the scraper 6 located above the anode plate body 4 through the air gun head 25. Subsequently, the dust particles that have not fallen off and are attached to the surface of the scraper 6 and the anode plate body 4 can be impacted and dropped, so that the cleaning effect can be improved, and the situation that the dust attached to the gap on the surface of the anode plate body 4 is difficult to handle and scrape can be avoided, which is beneficial to improving the adsorption effect of the anode plate body 4 and reducing the dust removal effect of the anode plate body 4 affected by excessive attachment of particle dust.

[0051] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0052] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0053] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0054] Example 1, please refer to Figure 1-Figure 8 , a flue gas purification device in asphalt mixture production, wherein the cleaning components include an electrostatic precipitator body 1 and a conduit 2, a pouring trough 3, an anode plate body 4, a mounting baffle 401 and a filter bag 5, wherein the conduit 2 is fixedly connected to both sides of the surface of the electrostatic precipitator body 1, the pouring trough 3 is symmetrically fixedly connected to the bottom surface of the electrostatic precipitator body 1, the anode plate body 4 is arranged in the electrostatic precipitator body 1, the upper surface of the anode plate body 4 is fixedly connected with a mounting baffle 401, the mounting baffle 401 is fixed to the electrostatic precipitator body 1 by bolts, the filter bag 5 is symmetrically fixedly connected in the electrostatic precipitator body 1, a cleaning component for improving the conductive cleaning surface is arranged in the electrostatic precipitator body 1, and a toggle component for promoting dust detachment and improving air permeability is arranged in the electrostatic precipitator body 1:

[0055] The cleaning assembly includes a scraper 6, which is symmetrically arranged on both sides of the anode plate body 4, and the two scrapers 6 are distributed in an eight-shaped shape. Fixed blocks 7 are fixedly connected to both sides of the scraper 6. A movable plate 8 is arranged on the side of the fixed block 7 away from the scraper 6. The number of movable plates 8 is four, and the surfaces of the four movable plates 8 are all threadedly connected with threaded rods 9. The upper surface of the electrostatic precipitator body 1 is fixedly connected with a drive motor 10, and the output end of the drive motor 10 is fixedly connected to a single threaded rod 9. The top ends of the four threaded rods 9 all penetrate the electrostatic precipitator body 1. The top of the four threaded rods 9 is fixedly connected with a transmission assembly 11, which is composed of a pulley and a transmission belt. The belt is fixedly connected to the threaded rod 9, and the transmission belt is sleeved to the surface of the pulley. A mounting groove 12 is provided on the surface of the fixed block 7 close to the movable plate 8. A connecting rod 13 is rotatably connected in the mounting groove 12. The end of the connecting rod 13 away from the fixed block 7 is fixedly connected to the movable plate 8. A torsion spring 14 is sleeved on the surface of the connecting rod 13, and the two ends of the torsion spring 14 are respectively fixedly connected to the fixed block 7 and the movable plate 8;

[0056] The cleaning assembly also includes a first connecting plate 15, which is fixedly connected between the facing surfaces of the two movable plates 8. A bracket 16 is fixedly connected to the surface of the first connecting plate 15, and an electric telescopic rod 17 is fixedly connected to the upper surface of the bracket 16. The output end of the electric telescopic rod 17 is fixedly connected to a fixed plate 18, and an upper surface of the fixed plate 18 is fixedly connected to a sensing head 20, which is composed of a thickness sensor and a resistance sensor. A second connecting plate 19 is symmetrically hinged on the lower surface of the fixed plate 18 on one side close to the anode plate body 4, and an end of the second connecting plate 19 away from the fixed plate 18 is hingedly connected to the fixed block 7, and a mounting block 21 is fixedly connected to the lower surface of the second connecting plate 19, and a scraping belt 22 is fixedly connected between the facing surfaces of the two mounting blocks 21. Magnetic blocks 23 are symmetrically fixedly connected between the facing surfaces of the wiping belt 22 and the second connecting plate 19, and the second connecting plate 19 is magnetically attracted to the magnetic blocks 23 on the surface of the wiping belt 22. A hollow plate 24 is symmetrically fixedly connected to the top surface of the inner wall of the electrostatic precipitator body 1, and an air gun head 25 is evenly fixedly connected to the bottom surface of the hollow plate 24. A connecting pipe 26 is fixedly connected to the upper surface of the hollow plate 24, and a one-way valve 27 is fixedly connected to the surface of the connecting pipe 26. An end of the connecting pipe 26 away from the one-way valve 27 is fixedly connected to an air compressor 28. A push switch 29 located on one side of the facing surfaces of the two hollow plates 24 is fixedly connected to the top surface of the electrostatic precipitator body 1. By starting the drive motor 10, the output shaft of the drive motor 10 rotates to drive the connected threaded rod 9 to rotate, and when it is connected to the drive motor When the threaded rod 9 fixed to the output shaft of the machine 10 is driven, it can cooperate with the pulley of the transmission assembly 11 and the transmission belt to drive the other three threaded rods 9 to rotate uniformly. At this time, when the threaded rods 9 rotate uniformly, the threaded transmission movable plate 8 is limited when it is subjected to the threaded transmission force, so that in the initial state, the movable plates 8 located below the two sides of the anode plate body 4 are subjected to the transmission force, and then the movable plates 8 can move linearly up and down. In the process of the movement of the movable plates 8, the fixed blocks 7 can drive the scrapers 6 to scrape the particles and dust adsorbed on the surface of the anode plate body 4, and because the two scrapers 6 are arranged in an eight-shaped shape, the upwardly moving scraper 6 can guide the particles and dust scraped on the surface of the anode plate body 4, so that the scraped dust can be removed by the scrapers arranged in the eight-shaped shape. The plate 6 falls to both sides, and when the scraper 6 moves downward, the particles can be conveniently guided to the lower surface and fall into the pouring trough 3 for processing. When the fixed block 7 drives the scraper 6 to move, the scraping belt 22 is in close contact with the side surface of the anode plate body 4, so that the scraping belt 22 can cooperate with the scraper 6 to process and scrape the side of the anode plate body 4 when moving. At the same time, when the moving plate 8 moves to the top surface of the inner wall of the electrostatic precipitator body 1, the moving plate 8 at this time can apply force to squeeze the button of the pressing switch 29 to be stressed. As the button continues to be stressed, the originally separated electric contacts will contact each other, thereby connecting the circuit, and the current can be transmitted to the air compressor 28 through the trigger transmission signal of the switch. Then, after the air compressor 28 is turned on, it can suck in air for compression and pass it into the connecting pipe 26.At this time, the connecting pipe 26 will be opened and transmitted to the hollow plate 24, and sprayed to the anode plate body 4 and the surface of the scraper 6 located above the anode plate body 4 through the air gun head 25, and then the dust particles that have not fallen off the scraper 6 and the surface of the anode plate body 4 can be impacted and dropped, so that the cleaning effect is improved, and the situation that the dust attached to the gap on the surface of the anode plate body 4 is difficult to handle and scrape can be avoided;

[0057] During the cleaning process of the scraper 6, the induction head 20 can detect the surface thickness and resistance of the anode plate body 4. When the thickness of the anode plate body 4 is thinned by particle wear and the resistance increases abnormally, the indicator light of the induction head 20 flashes, and then the staff can suspend the operation of the electrostatic precipitator body 1, cancel the bolt installation of the baffle 401 and the electrostatic precipitator body 1, and then the scraper 6 located below the two sides of the anode plate body 4 can be pulled by the output end of the electric telescopic rod 17, and then the output end of the electric telescopic rod 17 can drive the fixed plate 18 to move when moving upward, and the change of the hinge angle of the second connecting plate 19 at this time drives the fixed block 7 to flip inward, so that the scraper 6 and the anode plate 4, which were originally tilted in an eight-shaped manner, are connected. The bottom surface of the anode plate body 4 is horizontal, and the scraper belt 22 is in a relaxed state, so that the second connecting plate 19 and the magnetic block 23 fixed on the surface of the scraper belt 22 generate suction force to limit the scraper belt 22, and then the threaded rod 9 can be rotated again by the drive motor 10. At this time, the upward movement of the movable plate 8 can make the scraper 6 fit with the bottom surface of the anode plate body 4. As the scraper 6 moves upward, the anode plate body 4 can be pushed to be removed from the surface of the electrostatic precipitator body 1. At this time, after the new anode plate body 4 is replaced and placed, the anode plate body 4 is reset by moving the movable plate 8 downward again, and then the mounting baffle 401 and the electrostatic precipitator body 1 can be installed and positioned by bolts, which is beneficial to improve the replacement efficiency of the anode plate body 4.

[0058] Example 2 further optimizes the flue gas purification device in asphalt mixture production provided in Example 1. Specifically, Figure 2 , Fig. 9 and Fig.10, a flue gas purification device and method in asphalt mixture production, wherein the toggle assembly includes a mounting plate 30, the mounting plate 30 is located on both side surfaces of the two filter bags 5, a second support plate 31 is fixedly connected to the surface of the mounting plate 30, a placement groove 32 is provided on the surface of the second support plate 31 close to the anode plate body 4, a toggle plate 33 is inserted in the placement groove 32, a support spring 34 is symmetrically fixedly connected in the placement groove 32, one end of the support spring 34 away from the placement groove 32 is fixedly connected to the surface of the toggle plate 33, the toggle plate 33 is hingedly connected to the second support plate 31 away from the anode plate body 4, and the toggle plate 33 is symmetrically rotated on the surface of one side close to the anode plate body 4 A rotating rod 35 is connected, and a toggle block 351 is symmetrically arranged on one side of the rotating rod 35 away from the second supporting plate 31. The toggle block 351 is fixedly connected to the first connecting plate 15 on one side. The toggle plate 33 is evenly fixedly connected with the protrusions 36 up and down. The toggle plate 33 is located between the facing surfaces of the two filter bags 5. The end of the protrusion 36 away from the toggle plate 33 is in an arc shape. In the process of the moving plate 8 driving the scraper 6 to move up and down, when the first connecting plate 15 cooperates with the moving plate 8 to move, the toggle block 351 can be driven by the first connecting plate 15 to fit the surface of the rotating rod 35. As the toggle block 351 gradually moves upward, the rotating rod 35 can be pushed to lift one side of the toggle plate 33. The raised paddle plate 33 can fit with the filter bag 5 at the upper position. During the rising process of the paddle plate 33, pressure can be applied to the support spring 34 at the upper end, so that the support spring 34 is contracted. When the movable plate 8 gradually moves upward and the contact between the paddle block 351 and the rotating rod 35 is cancelled, the elastic force of the support spring 34 at the upper end can push the paddle plate 33 to return to its original position. Since the support spring 34 accumulates force during the compression process, when the support spring 34 pushes the paddle plate 33, a certain driving force can be added during the resetting process of the paddle plate 33. At this time, before the paddle plate 33 moves downward and returns to its original position, it can be pushed by the support spring 34, so that the filter bag 5 below is subjected to a certain beating force. Subsequently, the filter bag 5 can be subjected to a certain beating force that resets after applying pressure, and part of the dust attached to the filter bag 5 is shaken off, thereby improving the cleanliness of the filter bag 5. Moreover, since the contact surface between the protrusion 36 fixed on the surface of the paddle 33 and the filter bag 5 is in an arc shape, the protrusion 36 can apply force more concentratedly during beating, thereby increasing the impact force on the filter bag 5. Moreover, the protrusion 36 can disperse the beating force, thereby reducing excessive wear of certain parts of the paddle 33 and extending its service life, which is beneficial to increasing the service life of the filter bag 5. The filter bag 5 maintains a relatively stretched shape, avoids excessive wrinkles or deformation, and reduces dust clogging, thereby restoring and improving the air permeability of the filter bag 5 to a certain extent.

[0059] The use process of the flue gas purification device in asphalt mixture production provided by the present invention is as follows:

[0060] When the anode plate body 4 needs to be cleaned, the drive motor 10 is started to operate so that the output shaft of the drive motor 10 rotates to drive the connected threaded rod 9 to rotate. When the threaded rod 9 fixed to the output shaft of the drive motor 10 is driven, it can cooperate with the pulley of the transmission assembly 11 and the transmission belt to drive the other three threaded rods 9 to rotate uniformly. At this time, when the threaded rods 9 rotate uniformly, the threaded transmission movable plate 8 is limited when it is subjected to the thread transmission force, so that in the initial state, the movable plates 8 located below the two sides of the anode plate body 4 are subjected to the transmission force, and then the movable plates 8 can move linearly up and down. During the movement of the movable plates 8, the fixed block 7 can drive the scraper 6 to scrape the particles and dust adsorbed on the surface of the anode plate body 4. Since the two scrapers 6 are arranged in an eight-shaped shape, the upwardly moving scraper 6 can guide the particles and dust scraped on the surface of the anode plate body 4, so that the scraped dust can fall to both sides through the eight-shaped scraper 6, and when the scraper 6 moves downward, the particles can be conveniently guided to the lower surface and fall into the pouring trough 3. The scraper 6 is moved by the fixed block 7, and the scraper belt 22 is in close contact with the side surface of the anode plate body 4, so that the scraper belt 22 can cooperate with the scraper 6 to scrape the side of the anode plate body 4 when moving. At the same time, when the moving plate 8 moves to the top surface of the inner wall of the electrostatic precipitator body 1, the moving plate 8 can apply force to press the button of the switch 29. As the button is continuously stressed, the originally separated electric contacts will contact each other, thereby connecting the circuit, and the current can pass through the trigger transmission signal of the switch. The air compressor 28 is operated, and then the air compressor 28 is turned on to suck in air for compression and transfer into the connecting pipe 26. At this time, the connecting pipe 26 is opened and then transmitted to the hollow plate 24, and sprayed to the anode plate body 4 and the surface of the scraper 6 located above the anode plate body 4 through the air gun head 25. Then, the dust particles that have not fallen off and adhered to the surface of the scraper 6 and the anode plate body 4 can be impacted and dropped, so that the cleaning effect is improved, and the situation that the dust adhered to the gap on the surface of the anode plate body 4 is difficult to handle and scrape can be avoided;

[0061] During the cleaning process of the scraper 6, the induction head 20 can detect the surface thickness and resistance of the anode plate body 4. When the thickness of the anode plate body 4 is thinned by particle wear and the resistance increases abnormally, the indicator light outside the induction head 20 flashes, prompting the staff to replace the anode plate body 4. Then the staff can suspend the operation of the electrostatic precipitator body 1 and cancel the bolt installation of the baffle 401 and the electrostatic precipitator body 1. At this time, the scraper 6 located below the two sides of the anode plate body 4 can be pulled by the output end of the electric telescopic rod 17. Then, the output end of the electric telescopic rod 17 can drive the fixed plate 18 to move when it moves upward. At this time, the change in the hinge angle of the second connecting plate 19 drives the fixed block 7 to flip inward, so that the originally splayed The inclined scraper 6 is horizontal to the bottom surface of the anode plate body 4. At this time, the scraper belt 22 is in a relaxed state, so that the second connecting plate 19 and the magnetic suction block 23 fixed on the surface of the scraper belt 22 generate suction to limit the scraper belt 22. Then, the threaded rod 9 can be rotated again by the transmission of the driving motor 10. At this time, the upward movement of the movable plate 8 can make the scraper 6 fit with the bottom surface of the anode plate body 4. As the scraper 6 moves upward, the anode plate body 4 can be pushed to be removed from the surface of the electrostatic precipitator body 1. At this time, after the new anode plate body 4 is replaced and placed, the anode plate body 4 is reset by the downward movement of the movable plate 8 again. Then, the mounting baffle 401 and the electrostatic precipitator body 1 can be installed and positioned by bolts, which is conducive to improving the replacement efficiency of the anode plate body 4.

[0062] In the process of the moving plate 8 driving the scraper 6 to move up and down, when the first connecting plate 15 cooperates with the moving plate 8 to move, the toggle block 351 can be driven by the first connecting plate 15 to fit with the surface of the rotating rod 35. As the toggle block 351 gradually moves upward, the rotating rod 35 can be pushed to lift one side of the toggle plate 33. The lifted toggle plate 33 can fit with the filter bag 5 at the upper position. In the process of the toggle plate 33 rising, pressure can be applied to the upper support spring 34 to make the support spring 34 contract. When the moving plate 8 gradually moves upward and the contact between the toggle block 351 and the rotating rod 35 is cancelled, the elastic force of the upper support spring 34 can push the toggle plate 33 to return to its original position. Since the support spring 34 accumulates force during the compression process, when the support spring 34 pushes the toggle plate 33, the toggle plate 33 can be reset. A certain driving force is added in the middle. At this time, the paddle plate 33 can be pushed by the supporting spring 34 before it moves down and resets, so that the filter bag 5 below is subjected to a certain beating force, and then the filter bag 5 can be subjected to a certain beating force after being pressed and reset, and part of the dust attached to the filter bag 5 is shaken off, thereby improving the cleanliness of the filter bag 5. Moreover, since the contact surface between the protrusion 36 fixed on the surface of the paddle plate 33 and the filter bag 5 is in an arc shape, the protrusion 36 can apply force more concentratedly during beating, thereby increasing the impact force on the filter bag 5, and the protrusion 36 can disperse the beating force, thereby reducing excessive wear of certain parts of the paddle plate 33, extending its service life, and being beneficial to increasing the service life of the filter bag 5. The filter bag 5 maintains a relatively stretched shape, avoids excessive wrinkles or deformation, and reduces dust clogging, so that the air permeability of the filter bag 5 is restored and improved to a certain extent.

[0063] Example 3, a flue gas purification method in asphalt mixture production, using a comprehensive atmospheric sampling device and an online monitoring sampling device to collect and sample pollutants, the comprehensive atmospheric sampling device collects gas at a specified flow rate for 45min to 60min, and uses a gas chromatograph-mass spectrometer for analysis. The pollutants tested by this method are PM2.5, PM10, asphalt smoke, NOX, benzopyrene, and non-methane total hydrocarbons, and the method includes the following steps:

[0064] S1. The non-production area in the wind direction above the mixing building is used as the background point, and the area below the mixing building discharge port is used as the test point. The pollutants are collected and sampled using a comprehensive atmospheric sampling device and an online monitoring sampling device. The pollutants collected by the comprehensive atmospheric sampling device are sent to the laboratory for testing, and the online monitoring device outputs data in real time;

[0065] S2. When collecting pollutants below the discharge port, select 4 measuring points at the center of each side of the rectangular discharge port (but not in contact with the mixture) to reduce the influence of the atmosphere and wind speed on the test results. After the asphalt mixture production is stable, pollutant sampling is carried out. Generally, the test starts after 2 trucks of material are discharged. Each test position is tested 3 times, and then the average value is taken as the test result, and the result is used as the calibration data;

[0066] S3. An online monitoring device is installed below the discharge port, which can automatically record the test data. When the results are output, the test value of the comprehensive atmospheric collection device is used as the calibration of the data fluctuation, thereby determining the maximum concentration value of pollutant emissions of a certain type of asphalt mixture at the discharge port;

[0067] S4. Install a comprehensive atmospheric sampling device in the non-production area in the wind direction above the mixing building. Start the test after two trucks of asphalt mixture are stably produced. Perform sampling test three times and take the average value as the test result, which is used as the calibration data.

[0068] S5. Install an online monitoring device in the non-production area in the wind direction above the mixing building. When outputting the results, use the test value of the comprehensive atmospheric collection device as the calibration of data fluctuations, thereby determining the minimum concentration value of pollutant emissions at the background point during the production of a certain type of asphalt mixture;

[0069] S6. The ratio of the maximum pollutant concentration at the discharge port to the minimum pollutant concentration at the background point is used as an evaluation indicator for the pollutant emission level in the production process of a certain type of asphalt mixture.

[0070] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0071] Obviously, the embodiments described above are only some embodiments of the present invention, rather than all embodiments. The preferred embodiments of the present invention are given in the accompanying drawings, but they do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific embodiments, or to perform equivalent replacements for some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of the present invention, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the present invention.

Claims

1. A flue gas purification device in asphalt mixture production, characterized in that: The invention comprises an electrostatic precipitator body (1), a conduit (2), a material pouring trough (3), an anode plate body (4), a mounting baffle (401) and a filter bag (5), wherein the conduit (2) is fixedly connected to both sides of the surface of the electrostatic precipitator body (1), the material pouring trough (3) is symmetrically fixedly connected to the bottom surface of the electrostatic precipitator body (1), the anode plate body (4) is arranged in the electrostatic precipitator body (1), the upper surface of the anode plate body (4) is fixedly connected to the mounting baffle (401), the mounting baffle (401) is fixed to the electrostatic precipitator body (1) by bolts, the filter bag (5) is symmetrically fixedly connected in the electrostatic precipitator body (1), a cleaning component for improving the conductive cleaning surface is arranged in the electrostatic precipitator body (1), and a toggle component for promoting dust detachment and improving air permeability is arranged in the electrostatic precipitator body (1); The cleaning assembly comprises a scraper (6), the scraper (6) being symmetrically arranged on both sides of the anode plate body (4), the two scrapers (6) being arranged in an eight-shaped arrangement, the two sides of the scraper (6) being fixedly connected with fixed blocks (7), the side of the fixed block (7) away from the scraper (6) being provided with a movable plate (8), the number of the movable plates (8) being four, the surfaces of the four movable plates (8) being all threadedly connected with threaded rods (9), the upper surface of the electrostatic precipitator body (1) being fixedly connected with a drive motor (10), the output end of the drive motor (10) being fixedly connected with a single threaded rod (9), the top ends of the four threaded rods (9) all passing through the surface of the electrostatic precipitator body (1), and the top ends of the four threaded rods (9) being fixedly connected with a transmission assembly (11); The toggle assembly comprises a mounting plate (30), the mounting plate (30) being located on both side surfaces of the two filter bags (5), the surface of the mounting plate (30) being fixedly connected to a second support plate (31), the surface of the second support plate (31) close to the side of the anode plate body (4) being provided with a placement groove (32), a toggle plate (33) being inserted into the placement groove (32), a support spring (34) being symmetrically fixedly connected in the placement groove (32), an end of the support spring (34) being far from the placement groove (32) being fixedly connected to the surface of the toggle plate (33), and the toggle plate (33) being symmetrically fixedly connected to the surface of the toggle plate (33). The second support plate (31) away from the anode plate body (4) is hingedly connected, the surface of the side of the dial plate (33) close to the anode plate body (4) is symmetrically rotatably connected to a rotating rod (35), the side of the rotating rod (35) away from the second support plate (31) is symmetrically provided with a dial block (351), the dial block (351) is fixedly connected to the first connecting plate (15) on one side, the dial plate (33) is evenly fixedly connected with a protrusion (36) at the top and bottom, the dial plate (33) is located between the facing surfaces of the two filter bags (5), and the end of the protrusion (36) away from the dial plate (33) is arc-shaped; A mounting groove (12) is provided on a surface of one side of the fixed block (7) close to the movable plate (8), a connecting rod (13) is rotatably connected in the mounting groove (12), one end of the connecting rod (13) away from the fixed block (7) is fixedly connected to the movable plate (8), a torsion spring (14) is sleeved on the surface of the connecting rod (13), and two ends of the torsion spring (14) are respectively fixedly connected to the fixed block (7) and the movable plate (8).

2. The flue gas purification device in asphalt mixture production according to claim 1 is characterized in that: The cleaning assembly further comprises a first connecting plate (15), the first connecting plate (15) being fixedly connected between the facing surfaces of the two movable plates (8), a bracket (16) being fixedly connected to the surface of the first connecting plate (15), an electric telescopic rod (17) being fixedly connected to the upper surface of the bracket (16), a fixed plate (18) being fixedly connected to the output end of the electric telescopic rod (17), a second connecting plate (19) being symmetrically hingedly connected to the lower surface of a side of the fixed plate (18) close to the anode plate body (4), an end of the second connecting plate (19) away from the fixed plate (18) being hingedly connected to a fixed block (7), a mounting block (21) being fixedly connected to the lower surface of the second connecting plate (19), a scraping belt (22) being fixedly connected between the facing surfaces of the two mounting blocks (21), and a hollow plate (24) being symmetrically fixedly connected to the top surface of the inner wall of the electrostatic precipitator body (1).

3. The flue gas purification device in asphalt mixture production according to claim 1 is characterized in that: The transmission assembly (11) is composed of a pulley and a transmission belt, the belt is fixedly connected to the threaded rod (9), and the transmission belt is transmission-sleeved to the surface of the pulley.

4. The flue gas purification device in asphalt mixture production according to claim 2 is characterized in that: The upper surface of the fixed plate (18) is fixedly connected to a sensing head (20), wherein the sensing head (20) is composed of a thickness sensor and a resistance sensor.

5. The flue gas purification device in asphalt mixture production according to claim 2, characterized in that: Magnetic blocks (23) are symmetrically fixedly connected between the facing surfaces of the scraping belt (22) and the second connecting plate (19), and the second connecting plate (19) and the magnetic blocks (23) on the surface of the scraping belt (22) are magnetically attracted to each other.

6. The smoke purification device in asphalt mixture production according to claim 2 is characterized in that: The bottom surface of the hollow plate (24) is evenly fixedly connected to an air gun head (25), the upper surface of the hollow plate (24) is fixedly connected to a connecting pipe (26), the surface of the connecting pipe (26) is fixedly connected to a one-way valve (27), one end of the connecting pipe (26) away from the one-way valve (27) is fixedly connected to an air compressor (28), and the top surface of the electrostatic precipitator body (1) is fixedly provided with a push switch (29) located on the side of the facing surfaces of the two hollow plates (24).

7. A method for purifying flue gas in the production of asphalt mixture, using the flue gas purification device in the production of asphalt mixture as claimed in claim 6, characterized in that: The integrated air sampling device and the online monitoring sampling device are used to collect and sample pollutants. The integrated air sampling device collects air at the specified flow rate for 45 minutes to 60 minutes. The steps include: S1. The non-production area in the wind direction above the mixing building is used as the background point, and the area below the mixing building discharge port is used as the test point. The pollutants are collected and sampled using a comprehensive atmospheric sampling device and an online monitoring sampling device. The pollutants collected by the comprehensive atmospheric sampling device are sent to the laboratory for testing, and the online monitoring sampling device outputs data in real time. S2. When collecting pollutants below the discharge port, select 4 measuring points at the center of each side of the rectangular discharge port to reduce the influence of the atmosphere and wind speed on the test results. Sampling of pollutants is carried out after the production of asphalt mixture is stable. The test is started after 2 trucks of material are discharged. Each test position is tested 3 times, and then the average value is taken as the test result, and the result is used as the calibration data; S3. An online monitoring device is installed below the discharge port, which automatically records the test data. When the results are output, the test value of the comprehensive atmospheric collection device is used as the calibration of the data fluctuation, thereby determining the maximum concentration value of pollutant emissions of a certain type of asphalt mixture at the discharge port; S4. Install a comprehensive atmospheric sampling device in the non-production area in the wind direction above the mixing building. Start the test after two trucks of asphalt mixture are stably produced. Perform sampling test three times and take the average value as the test result, which is used as the calibration data. S5. Install an online monitoring device in the non-production area in the wind direction above the mixing building. When outputting the results, use the test value of the comprehensive atmospheric collection device as the calibration of data fluctuations, thereby determining the minimum concentration value of pollutant emissions at the background point during asphalt mixture production; S6. The ratio of the maximum pollutant concentration at the discharge port to the minimum pollutant concentration at the background point is used as an evaluation indicator for the pollutant emission level in the asphalt mixture production process.

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