Waste gas treatment device and method for asphalt concrete production

Abstract

The invention relates to the technical field of waste gas separation treatment, and discloses a waste gas treatment device for asphalt concrete production, the waste gas treatment device comprises an outer shell, the upper end and the lower end of the two sides of the outer shell are respectively provided with a flue gas inlet and a flue gas outlet, and the top end of the outer shell is fixedly provided with a driving motor; according to the waste gas treatment device and method for asphalt concrete production, a traditional mode of directly installing a cloth bag is changed into a mode of installing a filter cloth bag on a supporting base plate in an attached mode, the filter cloth bag is fixedly installed on the supporting base plate, and the filter cloth bag is fixedly installed on the supporting base plate; therefore, the filtering and separating effect that the filtering cloth bag is stable and does not deform can be guaranteed, and more importantly, a dust layer attached to the surface of the filtering cloth bag is knocked and scattered by means of the striking effect of the knocking head on the supporting base plate subsequently, so that the continuous and effective dust filtering and separating effect of the filtering cloth bag is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of waste gas separation and treatment technology, specifically to a waste gas treatment device and method for asphalt concrete production. Background Technology

[0002] Asphalt mixing plants generate complex waste gases during the asphalt mixture production process, mainly containing dust, asphalt fumes, and small amounts of sulfides. Therefore, these waste gases need to be purified before emission. Current technologies employ different equipment for different stages of asphalt waste gas treatment. Baghouse dust collectors are primarily used for dust removal. However, existing baghouse dust collectors still have some problems in their use, as detailed below:

[0003] Existing baghouse dust collectors primarily utilize dust separation bags for dust filtration. The use of these bags, aided by the initial layer formed by subsequent dust accumulation, further enhances separation accuracy. However, with increasing usage time, the dust buildup on the bags gradually thickens, leading to a sharp increase in internal flow resistance. Therefore, regular cleaning of the dust and impurities adhering to the bag surface is necessary. Current technologies employ pulsed airflow for backwashing, but this method cannot precisely control the thickness of the dust adhering to the bag surface. Furthermore, the pulsed airflow cleaning method allows the outer surface of the bags to be used to increase filtration efficiency. The damage to the initial layer of the filter bag leads to a decrease in its performance and the need to spend time rebuilding the initial layer, significantly reducing the efficiency of the equipment. Furthermore, pulse cleaning typically involves a pulse head at the top of the filter bag, but this requires a very high airflow pressure to clean a large area of ​​the bag. The cleaning effect decreases progressively as the filter bag moves further away from the pulse head, resulting in poor overall cleaning efficiency and hindering the continuous and efficient use of the bag filter. Therefore, we propose a waste gas treatment device and method for asphalt concrete production. Summary of the Invention

[0004] This invention provides a waste gas treatment device and method for asphalt concrete production, which has the advantages of stable and reliable performance and strong applicability, and solves the problems mentioned in the background art.

[0005] This invention provides the following technical solution: a waste gas treatment device for asphalt concrete production, comprising an outer shell, wherein an air inlet and an outlet for flue gas are respectively installed at the upper and lower ends of both sides of the outer shell, a drive motor is fixedly installed at the top of the outer shell, a discharge hopper is fixedly installed at the bottom of the outer shell, a support plate is fixedly installed at the upper part of the interior of the outer shell, an outer frame assembly is fixedly installed at the bottom of the support plate, square grooves are evenly opened on the support plate and a cross bracket is fixedly installed in the square grooves, a drive assembly is movably sleeved on the cross bracket, a trigger assembly is movably sleeved on the drive assembly, and a knocking cleaning assembly is evenly installed inside the outer frame assembly.

[0006] In a preferred embodiment, the outer frame assembly includes a frame body with evenly spaced ventilation grid grooves, a support base plate is mounted on the outer side of the frame body, a filter bag is fixedly mounted on the outer side of the support base plate, and an end block is fixedly mounted inside the frame body.

[0007] In a preferred embodiment, the top end of the frame body is sealed and fixedly installed to the bottom end of the supporting cross plate. The outer surface of the frame body at one end of the coverage area of ​​the ventilation grid groove is recessed. The supporting base plate is embedded in the recessed part and is detachably connected. The knocking cleaning component is hinged to the end block.

[0008] In a preferred embodiment, the drive assembly includes a rotating wheel, a drive screw is fixedly mounted at the bottom end of the rotating wheel, a base plate is movably mounted inside the bottom end of the drive screw via a plug rod, uprights are fixedly mounted at the four corners of the upper surface of the base plate, and a scraping structure is fixedly mounted at the top of the uprights.

[0009] In a preferred embodiment, there are multiple rotating wheels connected by belt drive, the base plate is located at the bottom of the frame body, the drive screw passes through the bottom of the frame body and is rotatably connected to the base plate, and the scraping structure is located outside the outer frame assembly.

[0010] In a preferred embodiment, the scraping structure includes a main frame, a sleeve shell is fixedly installed at one end of the main frame, an air guide tube is fixedly installed inside the main frame, an elastic hose is fixedly installed at one end of the air guide tube, a pressure transmission plate is fixedly installed at one end of the elastic hose, an elastic airbag is fixedly installed at the other end of the air guide tube, an intermediate plate is fitted to one end of the elastic airbag, and a scraper is fixedly installed in the middle of one end of the intermediate plate.

[0011] In a preferred embodiment, the two ends of the main frame are fixedly connected to the uprights. The main frame is positioned facing the filter bag. The air guide tube is embedded and fixedly installed inside the main frame. The air guide tube, elastic hose, and elastic airbag are sealed and filled with liquid. There are multiple elastic hoses, and the sum of their cross-sectional areas is less than the cross-sectional area of ​​the elastic airbag. The pressure transmission plate is slidably positioned inside the socket shell, with one end of the elastic hose located inside the socket shell. The maximum extension of the pressure transmission plate does not extend beyond the socket shell. The intermediate plate is positioned on the side of the main frame facing the filter bag and has limit protrusions at both ends.

[0012] In a preferred embodiment, the triggering component includes a base ring, a pressure rod is fixedly mounted on the side of the base ring, a positioning rod is fixedly mounted on the bottom end of the pressure rod, the base ring is threadedly connected to the drive screw, the pressure rod is provided with knocking cleaning components in each direction and is evenly distributed, the end of the pressure rod and one side of the knocking cleaning component partially coincide in the vertical projection direction, and the bottom end of the positioning rod is fixedly connected to the base plate and passes through the bottom end of the outer frame component.

[0013] In a preferred embodiment, the tapping cleaning assembly includes a pressure plate, a crossbar movably mounted at one end of the pressure plate, symmetrically formed mating grooves at both ends of one side of the crossbar, and tapping heads movably mounted evenly on one side of the crossbar. The pressure plate is configured to rotate unidirectionally upward on one side of the crossbar. The mating groove is hinged to an end block and rotatably connected, with a return spring provided at the hinge position. The tapping head is configured to have an adjustable angle, and its end is attached to one side of the supporting substrate.

[0014] A waste gas treatment device for asphalt concrete production, the specific usage method is as follows:

[0015] S1. The exhaust gas is sent into the housing through the air inlet, and the exhaust gas treatment device is started.

[0016] S2. The exhaust gas is filtered and separated by the filter bag, and the dust is separated out. Under the pressure of the subsequent air intake, the dust accumulates on the surface of the filter bag. The excess dust will automatically fall into the discharge hopper at the bottom for collection. The clean exhaust gas will pass through the filter bag and enter the frame body and be discharged from the outlet.

[0017] S3. When the gas flow resistance inside the frame increases to a specified threshold, the drive motor is started to drive the wheel to rotate. The wheel will drive the drive screw to rotate, which will cause the base ring to move down. The downward movement of the base ring will cause the pressure rod to press down and hit the pressure plate, causing the knocking head to lift up and fall down automatically to knock on the support base plate. At the same time, the positioning rod will also drive the bottom plate to move down, which will in turn cause the main frame to move down. Under the action of increased internal pressure, the scraper will automatically move laterally to a position at a specified distance from the filter bag. During the downward movement, the excessive dust accumulated on its surface will be scraped off, so that only the initial dust layer on the surface of the filter bag is retained.

[0018] S4. After the scraping is completed, the excess dust will fall into the discharge hopper below for collection. Then the drive motor will rotate, causing the pressure bar to move upward. During the upward movement, each pressure plate will rotate and fall down, achieving knocking and vibration to clean the dust again, until the base ring returns to the top for use.

[0019] The present invention has the following beneficial effects:

[0020] 1. The exhaust gas treatment device and method for asphalt concrete production changes the traditional method of directly installing filter bags to attaching the filter bags to a supporting base plate. This not only ensures the stable filtration and separation effect of the filter bags without deformation, but also facilitates the subsequent use of a tapping head to strike the supporting base plate, thereby knocking off the dust layer attached to the surface of the filter bags. Since the tapping and cleaning components are evenly distributed on one side of the supporting base plate, the trigger component drives the tapping and cleaning components to evenly clean the dust from the entire filter bag. The setting angle of the tapping head directly determines the tapping force, thereby controlling the degree of dust scattering on the surface of the filter bags and maximizing the uniform retention of the initial layer on the surface of the filter bags, thus ensuring a continuous and effective dust filtration and separation effect.

[0021] 2. The exhaust gas treatment device and method for asphalt concrete production includes a scraping structure on the outer side of the filter bag. Driven by a triggering component, this structure simultaneously drives an internally installed knocking and cleaning component to knock away dust, and moves the external scraping structure along with the triggering component. This uniformly scrapes away dust from the filter bag surface at a fixed distance, maximizing the uniformity of the initial layer on the filter bag surface. The scraping structure automatically adjusts its distance from the filter bag surface based on pressure changes caused by dust blockage inside the outer casing. When the pressure threshold for cleaning is reached, simply driving the drive component to rotate allows for precise scraping of the dust accumulated on the filter bag surface, ensuring the continuous and effective use of the baghouse dust collector. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0023] Figure 2 This is a three-dimensional cross-sectional view of the present invention;

[0024] Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A in the middle;

[0025] Figure 4 This is a schematic diagram of the first partial three-dimensional structure of the present invention;

[0026] Figure 5 This is a schematic diagram of the second partial three-dimensional structure of the present invention;

[0027] Figure 6 This is a partial three-dimensional schematic diagram of the scraping structure of the present invention;

[0028] Figure 7 This is a three-dimensional structural diagram of the tapping cleaning component of the present invention.

[0029] In the diagram: 1. Outer shell; 2. Drive motor; 3. Discharge hopper; 4. Supporting horizontal plate; 5. Outer frame assembly; 51. Frame body; 52. Ventilation grid groove; 53. Support base plate; 54. Filter bag; 55. End block; 6. Cross bracket; 7. Drive assembly; 71. Rotary wheel; 72. Drive screw; 73. Base plate; 74. Upright pole; 75. Scraping structure; 751. Main frame; 752. Sleeve shell; 753. Air guide pipe; 754. Elastic hose; 755. Pressure transmission plate; 756. Elastic airbag; 757. Middle plate; 758. Scraper; 8. Trigger assembly; 81. Base ring; 82. Pressure rod; 83. Positioning rod; 9. Tapping cleaning assembly; 91. Pressure plate; 92. Horizontal bar; 93. Connecting groove; 94. Tapping head. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The waste gas treatment device and method for asphalt concrete production involved in the present invention are not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Please see Figure 1-2A waste gas treatment device for asphalt concrete production includes an outer shell 1. A flue gas inlet and outlet are respectively installed at the upper and lower ends of both sides of the outer shell 1. A drive motor 2 is fixedly installed at the top of the outer shell 1. A discharge hopper 3 is fixedly installed at the bottom of the outer shell 1. A support plate 4 is fixedly installed at the upper part of the interior of the outer shell 1. An outer frame assembly 5 is fixedly installed at the bottom of the support plate 4. Square grooves are evenly distributed on the support plate 4, and a cross bracket 6 is fixedly installed within the square grooves. A drive assembly 7 is movably sleeved on the cross bracket 6. A trigger assembly 8 is movably sleeved on the drive assembly 7. A knocking and cleaning assembly 9 is evenly installed inside the outer frame assembly 5.

[0032] Compared with existing technologies, this application changes the traditional method of directly installing the filter bag to attaching the filter bag 54 to the support substrate 53. This not only ensures the stable filtration and separation effect of the filter bag 54 without deformation, but more importantly, it facilitates the subsequent tapping of the support substrate 53 by the tapping head 94 to knock off the dust layer attached to the surface of the filter bag 54. Since the tapping and cleaning components 9 are evenly distributed on one side of the support substrate 53, the trigger component 8 drives the tapping and cleaning components 9 to uniformly clean the dust on the filter bag 54. The setting angle of the tapping head 94 directly determines the tapping force, thereby controlling the degree of dust scattering on the surface of the filter bag 54, maximizing the uniform retention of the initial layer on the surface of the filter bag 54, and thus ensuring its... The filter bag 54 provides a continuous and effective dust filtration and separation effect. Simultaneously, a scraping structure 75 is provided on the outer side of the filter bag 54. Driven by the trigger component 8, this simultaneously drives the internal knocking and cleaning component 9 to knock away dust, and moves the external scraping structure 75 along with the trigger component 8. This uniformly scrapes away dust from the surface of the filter bag 54 at a fixed distance, maximizing the uniformity of the initial layer on the filter bag 54 surface. The scraping structure 75 automatically adjusts its distance from the surface of the filter bag 54 based on pressure changes caused by dust blockage inside the outer casing 1. Therefore, when the cleaning pressure threshold is reached, simply driving the drive component 7 to rotate allows for precise scraping of the dust accumulated on the surface of the filter bag 54, ensuring the continuous and effective use of the bag filter.

[0033] Please see Figure 1-3 A waste gas treatment device for asphalt concrete production includes an outer frame assembly 5, the outer frame assembly 5 includes a frame body 51, the frame body 51 is evenly provided with a permeable grid groove 52, a support base plate 53 is installed on the outer side of the frame body 51, a filter bag 54 is fixedly installed on the outer side of the support base plate 53, and an end block 55 is fixedly installed inside the frame body 51.

[0034] In this embodiment, it should be noted that the top of the frame body 51 is sealed and fixedly installed with the bottom of the supporting horizontal plate 4. The outer surface of the frame body 51 at one end of the coverage area of ​​the ventilation grid groove 52 is recessed. The supporting base plate 53 is embedded in the recessed part and is detachably connected. The knocking cleaning component 9 is hinged and movablely connected to the end block 55. In this way, during use, the filter bag 54 can be used to separate dust from the exhaust gas. When the separated dust accumulates on the outer surface of the filter bag 54 and needs to be cleaned, the trigger component 8 can be used to drive the drive component 7 and the knocking cleaning component 9 to scrape and knock it clean respectively, so as to ensure that the device can effectively achieve the self-cleaning function and ensure the use effect.

[0035] Please see Figure 2-5 A waste gas treatment device for asphalt concrete production includes a drive assembly 7, which includes a rotating wheel 71. A drive screw 72 is fixedly installed at the bottom end of the rotating wheel 71. A base plate 73 is movably installed inside the bottom end of the drive screw 72 via a plug rod. Uprights 74 are fixedly installed at the four corners of the upper surface of the base plate 73. A scraping structure 75 is fixedly installed at the top of the uprights 74.

[0036] In this embodiment, it should be noted that there are multiple rotating wheels 71 connected by belt drive. The base plate 73 is located at the bottom of the frame body 51. The drive screw 72 passes through the bottom of the frame body 51 and is rotatably connected to the base plate 73. The scraping structure 75 is located outside the outer frame assembly 5. When the rotating wheel 71 rotates and drives the drive screw 72 to rotate, it will drive the trigger component 8 sleeved on it to move up and down. During the downward movement, the internal knocking and cleaning component 9 knocks on the outer frame assembly 5 to clean the dust, while the external scraping structure 75 scrapes away the accumulated dust. The simultaneous operation of both greatly improves the dust treatment effect and the treatment accuracy.

[0037] Please see Figure 4-6 A waste gas treatment device for asphalt concrete production includes a scraping structure 75, which includes a main frame 751. A sleeve shell 752 is fixedly installed at one end of the main frame 751. An air guide pipe 753 is fixedly installed inside the main frame 751. An elastic hose 754 is fixedly installed at one end of the air guide pipe 753. A pressure transmission plate 755 is fixedly installed at one end of the elastic hose 754. An elastic airbag 756 is fixedly installed at the other end of the air guide pipe 753. An intermediate plate 757 is attached to one end of the elastic airbag 756. A scraper 758 is fixedly installed in the middle of one end of the intermediate plate 757.

[0038] In this embodiment, it should be noted that both ends of the main frame 751 are fixedly connected to the uprights 74. The main frame 751 is positioned facing the side where the filter bag 54 is located. The air guide pipe 753 is embedded and fixedly installed inside the main frame 751. The air guide pipe 753, the elastic hose 754, and the elastic airbag 756 are sealed and filled with liquid. There are multiple elastic hoses 754, and the sum of their cross-sectional areas is less than the cross-sectional area of ​​the elastic airbag 756. The pressure transmission plate 755 is slidably positioned inside the socket shell 752, and one end of the elastic hose 754 is located inside the socket shell 752. The maximum extension of the pressure transmission plate 755 does not extend beyond the interior of the socket shell 752. The intermediate plate 75... 7 is located on the side of the main frame 751 facing the filter bag 54 and has limit protrusions at both ends. As the device is used for a longer period of time, the internal flow resistance will gradually increase. This will gradually push the pressure transmission plate 755 to compress the elastic hose 754, causing the liquid inside to enter the elastic airbag 756 and expand. Due to the difference in cross-sectional area between the two, the compression depth of the elastic hose 754 will be much greater than the expansion degree of the elastic airbag 756. This allows the scraper 758 to automatically adjust its position at the end slightly according to the internal pressure of the device, thereby automatically adjusting its cleaning effect on the surface of the filter bag 54 during subsequent movement.

[0039] Please see Figure 4-5 A waste gas treatment device for asphalt concrete production includes a triggering assembly 8, which includes a base ring 81. A pressure rod 82 is fixedly installed on the side of the base ring 81, and a positioning rod 83 is fixedly installed at the bottom end of the pressure rod 82.

[0040] In this embodiment, it should be noted that the base ring 81 is threadedly connected to the drive screw 72, and the pressure rod 82 is provided with knocking cleaning components 9 in each direction and is evenly distributed. The end of the pressure rod 82 and one side of the knocking cleaning component 9 partially overlap in the vertical projection direction. The bottom end of the positioning rod 83 is fixedly connected to the bottom plate 73 and passes through the bottom end of the outer frame assembly 5. Thus, under the rotational drive of the rotating wheel 71, the base ring 81 will be moved. During the movement, the pressure rod 82 will press down on one end of the knocking cleaning component 9, causing it to tilt. After the contact is released, the knocking cleaning component 9 will automatically fall back to form an impact, thereby knocking and scattering the dust. At the same time, the positioning rod 83 will drive the bottom plate 73 to move down, thereby driving the side scraping structure 75 to scrape the dust on the surface of the filter bag 54, further ensuring the cleaning effect.

[0041] Please see Figure 2-7A waste gas treatment device for asphalt concrete production includes a knocking and cleaning component 9. The knocking and cleaning component 9 includes a pressure plate 91. A crossbar 92 is movably installed at one end of the pressure plate 91. A docking groove 93 is symmetrically opened at both ends of one side of the crossbar 92. A knocking head 94 is evenly movably installed on one side of the crossbar 92.

[0042] In this embodiment, it should be noted that the pressure plate 91 is configured to rotate unidirectionally upward on one side of the crossbar 92. The mating groove 93 is hinged and rotatably connected to the end block 55, and a reset coil spring is provided at the hinge position. The striking head 94 is configured with an adjustable angle, and its end is attached to one side of the support substrate 53. In this way, when the trigger component 8 moves down to press the pressure plate 91, the striking head 94 will be raised. After the trigger component 8 and the pressure plate 91 are separated, the striking head 94 will fall automatically under gravity and hit the support substrate 53, thereby knocking and scattering the dust accumulated on the striking head 94, achieving multi-point uniform dust cleaning.

[0043] A waste gas treatment device for asphalt concrete production, the specific usage method is as follows:

[0044] S1. The exhaust gas is sent into the housing 1 through the air inlet, and the exhaust gas treatment device is started.

[0045] S2. The exhaust gas is filtered and separated by the filter bag 54, and the dust is separated out. Under the pressure of the subsequent air intake, the dust accumulates on the surface of the filter bag 54. The excess dust will automatically fall into the discharge hopper 3 at the bottom for collection. The clean exhaust gas will pass through the filter bag 54 and enter the frame body 51 and be discharged from the outlet.

[0046] S3. When the gas flow resistance inside the frame body 51 increases to a specified threshold, the drive motor 2 is started to drive the rotating wheel 71 to rotate. The rotating wheel 71 will drive the drive screw 72 to rotate, thereby causing the base ring 81 to move down. The downward movement of the base ring 81 will cause the pressure rod 82 to press down and hit the pressure plate 91, causing the striking head 94 to lift up and automatically fall down to strike the support base plate 53. At the same time, the positioning rod 83 will also drive the bottom plate 73 to move down, thereby causing the main frame 751 to move down. Under the action of increased internal pressure, the scraper 758 will automatically move laterally to a position at a specified distance from the filter bag 54. During the downward movement, the excessively thick dust accumulated on its surface will be scraped off, so that only the initial dust layer on the surface of the filter bag 54 is retained.

[0047] S4. After the scraping is completed, the excess dust will fall into the discharge hopper 3 below for collection. Then the drive motor 2 will rotate, causing the pressure rod 82 to move upward. During the upward movement, each pressure plate 91 will rotate and fall down, once again achieving knocking and vibration to clean the dust, until the base ring 81 returns to the top for use.

[0048] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A waste gas treatment device for asphalt concrete production, comprising an outer casing (1), characterized in that: The device includes an outer shell (1), on which the upper and lower ends of the outer shell (1) are respectively equipped with a flue gas inlet and an outlet. A drive motor (2) is fixedly installed at the top of the outer shell (1), and a discharge hopper (3) is fixedly installed at the bottom of the outer shell (1). A support plate (4) is fixedly installed at the top inside the outer shell (1), and an outer frame assembly (5) is fixedly installed at the bottom of the support plate (4). Square grooves are evenly opened on the support plate (4), and a cross bracket (6) is fixedly installed in the square grooves. A drive assembly (7) is movably sleeved on the cross bracket (6), and a trigger assembly (8) is movably sleeved on the drive assembly (7). A knocking cleaning assembly (9) is evenly installed inside the outer frame assembly (5).

2. The waste gas treatment device for asphalt concrete production according to claim 1, characterized in that: The outer frame assembly (5) includes a frame body (51), on which air-permeable grid grooves (52) are evenly opened. A support base plate (53) is installed on the outer side of the frame body (51), and a filter bag (54) is fixedly installed on the outer side of the support base plate (53). An end block (55) is fixedly installed inside the frame body (51).

3. The waste gas treatment device for asphalt concrete production according to claim 2, characterized in that: The top of the frame body (51) is sealed and fixedly installed with the bottom of the support plate (4). The outer surface of the frame body (51) with the ventilation grid groove (52) is recessed at one end of the coverage area. The support base plate (53) is embedded in the recessed part and is connected in a detachable manner. The knocking cleaning component (9) is hinged to the end block (55).

4. The waste gas treatment device for asphalt concrete production according to claim 1, characterized in that: The drive assembly (7) includes a rotating wheel (71), a drive screw (72) is fixedly installed at the bottom end of the rotating wheel (71), a base plate (73) is movably installed inside the bottom end of the drive screw (72) through a plug rod, and uprights (74) are fixedly installed at the four corners of the upper surface of the base plate (73), and a scraping structure (75) is fixedly installed at the top end of the uprights (74).

5. The waste gas treatment device for asphalt concrete production according to claim 4, characterized in that: The number of the rotating wheels (71) is multiple and they are connected by belt drive. The base plate (73) is located at the bottom of the frame body (51). The drive screw (72) passes through the bottom of the frame body (51) and is rotatably connected to the base plate (73). The scraping structure (75) is located outside the outer frame assembly (5).

6. The waste gas treatment device for asphalt concrete production according to claim 4, characterized in that: The scraping structure (75) includes a main frame (751), a sleeve shell (752) is fixedly installed at one end of the main frame (751), an air guide tube (753) is fixedly installed inside the main frame (751), an elastic hose (754) is fixedly installed at one end of the air guide tube (753), a pressure transmission plate (755) is fixedly installed at one end of the elastic hose (754), an elastic airbag (756) is fixedly installed at the other end of the air guide tube (753), an intermediate plate (757) is attached to one end of the elastic airbag (756), and a scraper (758) is fixedly installed in the middle of one end of the intermediate plate (757).

7. The waste gas treatment device for asphalt concrete production according to claim 6, characterized in that: The two ends of the main frame (751) are fixedly connected to the uprights (74). The main frame (751) is set facing the side where the filter bag (54) is located. The air guide pipe (753) is embedded and fixedly installed inside the main frame (751). The air guide pipe (753), the elastic hose (754) and the elastic airbag (756) are sealed and filled with liquid. There are multiple elastic hoses (754) and the sum of their cross-sectional areas is less than the cross-sectional area of ​​the elastic airbag (756). The pressure transmission plate (755) is slidably set inside the socket shell (752), and one end of the elastic hose (754) is set inside the socket shell (752). The maximum extension state of the pressure transmission plate (755) does not exceed the inside of the socket shell (752). The intermediate plate (757) is set on the side of the main frame (751) facing the filter bag (54) and has limit protrusions at both ends.

8. The waste gas treatment device for asphalt concrete production according to claim 1, characterized in that: The triggering component (8) includes a base ring (81), a pressure rod (82) is fixedly installed on the side of the base ring (81), a positioning rod (83) is fixedly installed at the bottom end of the pressure rod (82), the base ring (81) is threadedly connected to the drive screw (72), the pressure rod (82) is provided with a knocking cleaning component (9) in each direction and is evenly distributed, the end of the pressure rod (82) and one side of the knocking cleaning component (9) partially coincide in the vertical projection direction, the bottom end of the positioning rod (83) is fixedly connected to the base plate (73) and passes through the bottom end of the outer frame component (5).

9. The waste gas treatment device for asphalt concrete production according to claim 1, characterized in that: The tapping cleaning assembly (9) includes a pressure plate (91), a crossbar (92) is movably mounted on one end of the pressure plate (91), and a docking groove (93) is symmetrically opened at both ends on one side of the crossbar (92). A tapping head (94) is evenly movably mounted on one side of the crossbar (92). The pressure plate (91) is configured to rotate unidirectionally upward on one side of the crossbar (92). The docking groove (93) is hinged and rotatably connected to the end block (55), and a reset coil spring is provided at the hinge position. The tapping head (94) is configured to have an adjustable angle, and its end is attached to one side of the support base plate (53).

10. A waste gas treatment device for asphalt concrete production according to any one of claims 1-9, characterized in that, The specific usage method is as follows: S1. Send the exhaust gas into the housing (1) through the air inlet and start the exhaust gas treatment device; S2. The exhaust gas is filtered and separated by the filter bag (54), and the dust is separated out. Under the pressure of the subsequent air intake, the dust accumulates on the surface of the filter bag (54). The excess dust will automatically fall into the discharge hopper (3) at the bottom for collection. The clean exhaust gas will pass through the filter bag (54) and enter the frame body (51) and be discharged from the outlet. S3. When the gas flow resistance inside the frame body (51) increases to the specified threshold, the drive motor (2) is started to drive the rotating wheel (71) to rotate. The rotating wheel (71) will drive the drive screw (72) to rotate, thereby causing the base ring (81) to move down. The base ring (81) moving down will cause the pressure rod (82) to press down and hit the pressure plate (91), causing the knocking head (94) to lift up and automatically fall down to knock on the support base plate (53). At the same time, the positioning rod (83) will also drive the bottom plate (73) to move down, thereby causing the main frame (751) to move down. Under the action of increased internal pressure, the scraper (758) will automatically move laterally to a position at a specified distance from the filter bag (54). During the downward movement, the excessive dust accumulated on its surface will be scraped off, so that only the initial dust layer on the surface of the filter bag (54) is retained. S4. After the scraping is completed, the excess dust will fall into the discharge hopper (3) below for collection. Then the drive motor (2) will flip, causing the pressure rod (82) to move up. During the upward movement, each pressure plate (91) will rotate and fall down, achieving knocking and vibration cleaning again until the base ring (81) returns to the top for use.

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