Recycled waste gas treatment device for waste plastic thermal cracking

Abstract

The invention relates to the technical field of waste plastic thermal cracking, and particularly discloses a recycled waste gas treatment device for waste plastic thermal cracking, which comprises a protective shell, a gas inlet pipeline is mounted on the upper surface of the protective shell in a penetrating manner, and a cooling box body is fixedly connected to the inner wall of a cavity at the upper end of the protective shell; a filtering baffle is fixedly connected to the inner wall of a cavity of the cooling box body, a circulating cooling water pipe is arranged in the cavity of the cooling box body, and an air guide pipeline is installed on the lower surface of the cooling box body in a penetrating mode. According to the recycled waste gas treatment device for waste plastic thermal cracking, the cooling box body and the spiral circulating cooling water pipe are arranged, the spiral design of the circulating cooling water pipe greatly increases the contact area with waste gas and prolongs the contact time of the circulating cooling water pipe with the waste gas, waste gas heat can be fully absorbed, high-temperature waste gas generated by thermal cracking can be effectively cooled, and the waste gas treatment effect is improved. The influence of high-temperature waste gas on subsequent treatment links is avoided, and heat can be taken out by circulating water to be recycled.

Description

Technical Field

[0001] The invention relates to the technical field of thermal cracking of waste plastics, in particular to an exhaust gas treatment device for thermal cracking of recycled waste plastics. Background Art

[0002] Thermal cracking of waste plastics is a technology that converts waste plastics into useful products. Thermal cracking of waste plastics is a process in which waste plastics are heated to a certain temperature under anaerobic or anoxic conditions to cause a cracking reaction. The large-molecule plastic polymer chains are broken and converted into smaller-molecule hydrocarbon gases, liquid fuels, solid carbon and other products. First, the waste plastics must be sorted and cleaned to remove impurities, metals and other non-plastic components to ensure the purity of the cracking raw materials and improve the cracking efficiency and product quality. The pretreated waste plastics are fed into the cracking reactor and cracking reactions occur under the action of heating and catalysts. The reaction temperature is usually between 300℃ and 800℃. The specific temperature and reaction time required for different types of plastics vary.

[0003] Compared with direct landfill or incineration of waste plastics, thermal cracking can significantly reduce the pollution of plastic waste to the environment, reduce landfill space occupation and harmful gas emissions generated by incineration, and can convert waste plastics into economically valuable fuels and chemical raw materials, realize resource recycling, and reduce dependence on traditional fossil resources. The mixed products produced by cracking include gas, liquid and solid. Through separation technologies such as condensation, filtration, and distillation, the gas products, liquid products and solid products are collected and further processed separately.

[0004] Existing waste gas treatment devices for the pyrolysis of waste plastics, such as the one disclosed in publication number "CN211837200U," employ the following process: "Waste gas generated by the pyrolysis of plastic in a pyrolysis furnace is condensed and cooled in a condenser before entering a filter box from an air inlet. The waste gas first passes through a filter box... and is then filtered and purified by a filter medium." However, in actual use, the device fails to cool the introduced waste gas, and impurities in the filtered waste gas easily accumulate, affecting its circulation. Summary of the Invention

[0005] The purpose of the present invention is to provide a waste gas treatment device for thermal cracking of recycled waste plastics to solve the problems proposed in the above background technology that the device cannot cool the introduced waste gas and impurities filtered out of the waste gas are easily accumulated, affecting the circulation of the waste gas.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an exhaust gas treatment device for thermal cracking of recycled waste plastics, comprising a protective shell, an air intake pipe is installed through the upper surface of which, a cooling box is fixedly connected to the inner wall of the cavity at the upper end of the protective shell, a filter baffle is fixedly connected to the inner wall of the cavity of the cooling box, a circulating cooling water pipe is provided in the cavity of the cooling box, an air guide pipe is installed through the lower surface of the cooling box, a support mounting plate is fixedly connected to the inner wall of the cavity of the protective shell, a transmission air pipe is provided on the bottom surface of the cavity of the protective shell, and a stirring blade is fixedly connected to the outer surface of the transmission air pipe The outer surface of the transmission air pipe is fixedly connected with an air outlet nozzle, and the two side surfaces of the lower end of the protective shell are respectively penetrated by a liquid inlet pipe and a liquid outlet pipe, the side surface of the lower end of the protective shell is fixedly connected with a driving motor, and the output end of the driving motor is fixedly connected with a first transmission wheel, and the upper end of the transmission air pipe is penetrated by a second transmission wheel, and a linkage cleaning mechanism is provided between the protective shell and the cooling box, which drives the transmission cylinder and the linkage disc to rotate through the first transmission wheel, and then the linkage disc pushes the supporting connecting rod and the cleaning scraper to move and clean the filter baffle through the guide push rod, and the upper surface of the protective shell is penetrated by an exhaust pipe.

[0007] Preferably, the air inlet pipe is fixedly connected to the cooling box, the circulating cooling water pipe is spirally designed, and the inlet and outlet ends of the circulating cooling water pipe both pass through the side surface of the protective shell and the cooling box.

[0008] The above technical solution ensures that the exhaust gas entering from the air intake pipe can enter the cooling box stably and efficiently, avoids exhaust gas leakage, and ensures the smooth progress of the cooling treatment process. The spiral design increases the contact area and contact time between the cooling water pipe and the exhaust gas. The increased contact area can more fully absorb the heat in the exhaust gas, improve the cooling efficiency, and extend the contact time, further enhancing the cooling effect, so that the exhaust gas can be cooled to the appropriate temperature more quickly and effectively. It is convenient to connect to an external cooling water source and facilitate the circulation of cooling water. This design facilitates the maintenance and replacement of the cooling water pipe. When the cooling water pipe fails or needs to be cleaned, there is no need to disassemble too many device components, reducing the difficulty and cost of maintenance.

[0009] Preferably, the air guide duct passes through the upper end of the support mounting plate, the surface of the support mounting plate is provided with an air guide opening, the upper end of the transmission air pipe passes through the lower surface of the support mounting plate, and the transmission air pipe and the support mounting plate form a rotational connection.

[0010] By adopting the above technical solution, the exhaust gas treated by the cooling box can smoothly pass through the support mounting plate and enter the treatment area below, ensuring the continuity of the exhaust gas treatment process. These openings can guide the exhaust gas to pass through in an orderly manner, and at the same time play a preliminary diversion role on the exhaust gas, so that the exhaust gas is more evenly distributed in the subsequent treatment process, thereby improving the treatment effect. The transmission air pipe can rotate stably under the support of the support mounting plate to ensure its operational reliability; the rotating connection design allows the transmission air pipe to rotate freely, and cooperate with the stirring blades and the air outlet nozzle to realize the stirring and secondary treatment functions of the exhaust gas.

[0011] Preferably, the stirring blade is annular in design, and the vertical cross-section of the stirring blade is strip-shaped, and the air outlet nozzle is horizontally arranged and inclined in design.

[0012] By adopting the above technical solution, the annular design can stir the surrounding exhaust gas in all directions when the transmission air pipe rotates, so that the exhaust gas and the treatment liquid are fully mixed, the dissolution and reaction of impurities in the exhaust gas are promoted, and the treatment effect is improved. The long strip cross-section increases the contact area between the stirring blade and the exhaust gas, enhances the stirring force and effect, and makes the exhaust gas mixed more evenly. The horizontal arrangement can make the ejected gas evenly distributed on the same plane, avoiding local gas concentration or blank areas, ensuring more comprehensive and balanced treatment of the exhaust gas. The inclined design makes the ejected gas have a certain angle, which can better interact with the exhaust flow stirred by the stirring blade, enhance the gas mixing effect, and improve the treatment efficiency.

[0013] Preferably, the first transmission wheel is rotationally connected to the protective shell, the height of the first transmission wheel is the same as that of the second transmission wheel, and a belt is installed between the outer surface of the first transmission wheel and the outer surface of the second transmission wheel.

[0014] The above technical solution is adopted to ensure that the first transmission wheel can rotate stably under the drive of the driving motor, while reducing friction and energy loss during rotation, improving transmission efficiency, ensuring that the belt can maintain a good tension state and run smoothly between the two transmission wheels, avoiding problems such as belt slippage and twisting, and ensuring stable power transmission. Through belt transmission, the power of the driving motor is transmitted from the first transmission wheel to the second transmission wheel, thereby driving the transmission air pipe to rotate. This transmission method has buffering and overload protection functions, and can effectively avoid damage to the equipment due to sudden overload of the motor.

[0015] Preferably, the linkage cleaning mechanism includes a transmission cylinder, which is fixedly connected to the upper end of the device of the first transmission wheel, and the upper end of the transmission cylinder is fixedly connected to a linkage disc, and the upper surface of the linkage disc is provided with a guide push rod, and a support link is installed through the upper side surface of the protective shell and the cooling box, and one end of the support link is fixedly connected to a cleaning scraper.

[0016] By adopting the above technical solution, a complete mechanical transmission system is formed. The power of the driving motor is used to drive the rotation of the first transmission wheel. Through the coordinated action of the transmission cylinder, linkage disc, guide push rod and other components, the circular motion is converted into linear motion of the cleaning scraper, thereby realizing the automatic cleaning function of the filter baffle. There is no need for frequent manual cleaning, saving labor costs and improving the degree of automation of equipment operation.

[0017] Preferably, the transmission cylinder is coaxially arranged with the first transmission wheel, and the transmission cylinder is rotationally connected with the protective shell.

[0018] The above technical solution is adopted to ensure that the transmission cylinder can stably follow the rotation of the first transmission wheel, ensure the accuracy and stability of power transmission, avoid transmission deviation or jamming, enable the entire linkage cleaning mechanism to operate reliably, provide support for the rotation of the transmission cylinder, reduce friction and resistance during the rotation process, ensure its smooth rotation, and at the same time prevent the transmission cylinder from causing damage to the protective shell during rotation.

[0019] Preferably, the linkage disc is rotationally connected to the guide push rod, and the center of the linkage disc is offset from the axis of the guide push rod.

[0020] The above technical solution enables the guide push rod to move flexibly under the drive of the linkage disc, adapt to different motion trajectory requirements, and ensure that the cleaning scraper can smoothly complete the cleaning action. When the linkage disc rotates, this staggered design will cause the guide push rod to produce eccentric movement, and then convert the circular motion of the linkage disc into reciprocating linear motion of the guide push rod, thereby pushing the supporting connecting rod and the cleaning scraper to effectively clean the filter baffle.

[0021] Preferably, the guide push rod is rotatably connected to one end of the support connecting rod, and the support connecting rod is slidably connected to the protective shell and the cooling box body respectively.

[0022] The above technical solution allows the movement of the guide push rod to be smoothly transmitted to the supporting link, while allowing the supporting link to change its angle within a certain range to adapt to the movement requirements of the cleaning scraper, ensuring that the cleaning scraper can fit tightly against the filter baffle for cleaning, providing a stable guiding effect for the supporting link, ensuring that the cleaning scraper maintains linear motion during movement, and improving the cleaning effect; the sliding connection method can also reduce friction and wear during movement, thereby extending the service life of the equipment.

[0023] Preferably, the cleaning scraper is in sliding connection with the cooling box, the cleaning scraper is of inclined design, and a brush is provided on the lower surface of the cleaning scraper, and the brush of the cleaning scraper is in contact with the filter baffle.

[0024] The above technical solution is adopted to ensure that the cleaning scraper can move back and forth stably in the cooling box, continuously clean the filter baffle, and at the same time avoid the cleaning scraper from deflecting or shaking during movement, which affects the cleaning effect. The inclined design enables the cleaning scraper to better scrape off impurities on the filter baffle during movement, thereby improving the cleaning efficiency. The brush can penetrate into the gaps and holes of the filter baffle to clean finer impurities and improve the thoroughness of cleaning.

[0025] Compared with the prior art, the present invention has the following beneficial effects: the waste gas treatment device for thermal cracking of recycled waste plastics:

[0026] 1. The device is equipped with a cooling box and a spiral circulating cooling water pipe. The spiral design of the circulating cooling water pipe greatly increases the contact area and contact time with the exhaust gas, can fully absorb the heat of the exhaust gas, and can effectively cool the high-temperature exhaust gas generated by thermal cracking, avoiding the impact of high-temperature exhaust gas on subsequent treatment links, ensuring the stable operation of the treatment process. In addition, the circulating water can remove heat for recovery, thereby improving energy conservation.

[0027] 2. Through the linkage cleaning mechanism, the driving motor drives the first transmission wheel to rotate, which in turn rotates the transmission cylinder and the linkage disc. The eccentric rotation connection between the linkage disc and the guide push rod is used to convert the circular motion into the reciprocating linear motion of the guide push rod, thereby driving the support link and the cleaning scraper to move. The cleaning scraper is inclined and has a brush on the lower surface, which can fit closely with the filter baffle and automatically scrape off the impurities accumulated on the filter baffle to prevent the accumulation of impurities from affecting the exhaust gas circulation, thereby ensuring the filtering effect and the continuous and stable operation of the equipment, and saving labor cleaning costs;

[0028] 3. The annular stirring blades on the transmission air pipe stir the exhaust gas in all directions when the transmission air pipe rotates. The long strip cross-section increases the stirring force and contact area, so that the exhaust gas and the treatment liquid are fully mixed, which promotes the dissolution and reaction of impurities. The horizontally arranged and inclined air outlet nozzles ensure that the ejected gas is evenly distributed and interacts with the stirred exhaust flow, further improving the comprehensiveness and efficiency of the exhaust gas treatment and improving the quality of the exhaust gas treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the three-dimensional structure of the connection between the protective housing and the air intake duct of the present invention;

[0030] Figure 2 This is a schematic diagram of the three-dimensional structure of the connection between the protective housing and the drive motor of the present invention;

[0031] Figure 3 This is a schematic diagram of the three-dimensional structure of the connection between the air intake pipe and the cooling box of the present invention;

[0032] Figure 4 This is a schematic diagram of the three-dimensional structure of the connection between the air guide duct and the support mounting plate of the present invention;

[0033] Figure 5 This is a schematic diagram of the three-dimensional structure of the circulating cooling water pipe of the present invention;

[0034] Figure 6 This is a schematic diagram of the three-dimensional structure of the connection between the transmission air pipe and the second transmission wheel of the present invention;

[0035] Figure 7 This is a schematic diagram of the three-dimensional structure of the connection between the transmission air pipe and the air outlet nozzle of the present invention;

[0036] Figure 8 This is a schematic diagram of the three-dimensional structure of the connection between the first transmission wheel and the transmission cylinder of the present invention;

[0037] Figure 9 This is a schematic diagram of the three-dimensional structure of the connection between the supporting connecting rod and the cleaning scraper of the present invention.

[0038] In the figure: 1. Protective shell; 2. Air inlet duct; 3. Cooling box; 4. Filter baffle; 5. Circulating cooling water pipe; 6. Air guide duct; 7. Support mounting plate; 8. Transmission air pipe; 9. Mixing blade; 10. Air outlet nozzle; 11. Liquid inlet duct; 12. Liquid outlet duct; 13. Drive motor; 14. First transmission wheel; 15. Second transmission wheel; 16. Transmission cylinder; 17. Linkage disc; 18. Guide push rod; 19. Support connecting rod; 20. Cleaning scraper; 21. Exhaust duct. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] See also Figure 1-9The present invention provides a technical solution: a waste gas treatment device for thermal cracking of recycled waste plastics, comprising a protective shell 1, an air intake pipe 2, a cooling box 3, a filter baffle 4, a circulating cooling water pipe 5, an air guide pipe 6, a support mounting plate 7, a transmission air pipe 8, a stirring blade 9, an air outlet nozzle 10, a liquid inlet pipe 11, a liquid outlet pipe 12, a drive motor 13, a first transmission wheel 14, a second transmission wheel 15, a transmission cylinder 16, a linkage disc 17, a guide push rod 18, a support connecting rod 19, a cleaning scraper 20 and an exhaust pipe 21. The protective shell 1 has an air intake pipe 2 installed on its upper surface, and the upper end cavity of the protective shell 1 The inner wall of the cooling box 3 is fixedly connected, the air intake pipe 2 is fixedly connected to the cooling box 3, the circulating cooling water pipe 5 is spirally designed, and the inlet and outlet water ends of the circulating cooling water pipe 5 pass through the side surface of the protective shell 1 and the cooling box 3. The exhaust gas generated by the thermal cracking of waste plastics enters from the air intake pipe 2, so that the exhaust gas directly enters the cooling box 3. Cooling water can be passed through the inlet and outlet water ends of the circulating cooling water pipe 5. The spiral circulating cooling water pipe 5 increases the contact area and time with the exhaust gas, fully absorbs the heat of the exhaust gas, and realizes cooling treatment of the exhaust gas. The cooled exhaust gas is transmitted downward through the air guide pipe 6, and the air guide pipe 6 passes through the upper end of the support mounting plate 7.

[0041] The inner wall of the cavity of the cooling box 3 is fixedly connected with a filter baffle 4, a circulating cooling water pipe 5 is provided in the cavity of the cooling box 3, an air guide pipe 6 is installed through the lower surface of the cooling box 3, a support mounting plate 7 is fixedly connected to the inner wall of the cavity of the protective shell 1, a transmission air pipe 8 is provided on the bottom surface of the cavity of the protective shell 1, the outer surface of the transmission air pipe 8 is fixedly connected with a stirring blade 9, and the outer surface of the transmission air pipe 8 is fixedly connected with an air outlet nozzle 10, the air guide pipe 6 passes through the upper end of the support mounting plate 7, the surface of the support mounting plate 7 is provided with an air guide opening, the upper end of the transmission air pipe 8 passes through the lower surface of the support mounting plate 7, and the transmission air pipe 8 is rotatably connected to the support mounting plate 7, and the stirring blade 9 is an annular design , and the vertical cross-section of the stirring blade 9 is designed as a long strip, the air outlet nozzle 10 is arranged horizontally, and the air outlet nozzle 10 is designed to be inclined. The drive motor 13 is started, and the first transmission wheel 14 at its output end rotates. At the same time, the first transmission wheel 14 drives the second transmission wheel 15 to rotate through a belt, thereby rotating the transmission air pipe 8, and the annular stirring blade 9 on the outer surface of the transmission air pipe 8 rotates accordingly, increasing the contact area and stirring force with the exhaust gas, so that the exhaust gas is fully mixed with the treatment liquid entering from the liquid inlet pipe 11, promoting the dissolution and reaction of impurities, and the horizontally arranged and inclined air outlet nozzle 10 on the transmission air pipe 8 sprays gas, which interacts with the stirred exhaust flow, further enhancing the exhaust gas treatment effect.

[0042] The surfaces of both sides of the lower end of the protective shell 1 are respectively penetrated with a liquid inlet pipe 11 and a liquid outlet pipe 12, the side surface of the lower end of the protective shell 1 is fixedly connected to a drive motor 13, the output end of the drive motor 13 is fixedly connected to a first transmission wheel 14, the upper end of the transmission air pipe 8 is penetrated with a second transmission wheel 15, the first transmission wheel 14 is rotatably connected to the protective shell 1, the height of the first transmission wheel 14 is the same as the height of the second transmission wheel 15, a belt is installed between the outer surface of the first transmission wheel 14 and the outer surface of the second transmission wheel 15, the linkage cleaning mechanism includes a transmission cylinder 16, the transmission cylinder 16 is fixedly connected to the upper end of the device of the first transmission wheel 14, the transmission cylinder 16 A linkage disc 17 is fixedly connected to the upper end of the linkage disc 17, and a guide push rod 18 is provided on the upper surface of the linkage disc 17. A support link 19 is installed through the upper side surfaces of the protective shell 1 and the cooling box 3. One end of the support link 19 is fixedly connected to a cleaning scraper 20. When the driving motor 13 drives the first transmission wheel 14 to rotate, the transmission cylinder 16 fixedly connected to the upper end of the first transmission wheel 14 rotates synchronously, and the linkage disc 17 at the upper end of the transmission cylinder 16 rotates accordingly. The linkage disc 17 and the guide push rod 18 are rotationally connected and the center of the circle is misaligned with the axial center of the guide push rod 18, so that when the linkage disc 17 rotates, the guide push rod 18 performs eccentric motion to push the support link 19.

[0043] A linkage cleaning mechanism is provided between the protective shell 1 and the cooling box 3, which drives the transmission cylinder 16 and the linkage disc 17 to rotate through the first transmission wheel 14, and then the linkage disc 17 pushes the supporting connecting rod 19 and the cleaning scraper 20 to move and clean the filter baffle 4 through the guide push rod 18. An exhaust pipe 21 is installed through the upper surface of the protective shell 1. The transmission cylinder 16 is coaxially arranged with the first transmission wheel 14. The transmission cylinder 16 is connected to the protective shell 1 in a rotational manner. The linkage disc 17 is connected to the guide push rod 18 in a rotational manner, and the center of the linkage disc 17 is staggered with the axis of the guide push rod 18. The guide push rod 1 8 is rotatably connected with one end of the support link 19, and the support link 19 is respectively slidably connected with the protective shell 1 and the cooling box 3. The cleaning scraper 20 is slidably connected with the cooling box 3. The cleaning scraper 20 is inclined, and a brush is provided on the lower surface of the cleaning scraper 20. The brush of the cleaning scraper 20 fits with the filter baffle 4. During the movement of the support link 19, the cleaning scraper 20 fixed at one end of the support link 19 scrapes off impurities accumulated on the filter baffle 4 to prevent impurities from affecting the exhaust gas circulation and filtering effect. Finally, the purified exhaust gas is discharged from the exhaust pipe 21 on the upper surface of the protective shell 1.

[0044] Working principle: When using the waste gas treatment device for thermal cracking of recycled waste plastics, the waste gas is first introduced into the cooling box 3 through the air inlet pipe 2, cooled by the circulating cooling water pipe 5, and then enters the lower area through the air guide pipe 6. The transmission air pipe 8 rotates under the drive of the first transmission wheel 14, the second transmission wheel 15 and the drive motor 13, the stirring blade 9 stirs the waste gas, and the air outlet nozzle 10 sprays gas to enhance the treatment effect. The linkage cleaning mechanism drives the transmission cylinder 16 and the linkage disc 17 to rotate through the first transmission wheel 14, and then the linkage disc 17 pushes the support connecting rod 19 and the cleaning scraper 20 through the guide push rod 18 to clean the filter baffle 4. Finally, the treated gas is discharged through the exhaust pipe 21, which increases the overall practicality.

[0045] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A waste gas treatment device for thermal cracking of recycled waste plastics, comprising a protective housing (1), an air intake pipe (2) being installed through the upper surface of the protective housing, characterized in that: The inner wall of the cavity at the upper end of the protective shell (1) is fixedly connected to a cooling box (3), the inner wall of the cavity of the cooling box (3) is fixedly connected to a filter baffle (4), a circulating cooling water pipe (5) is provided in the cavity of the cooling box (3), an air guide pipe (6) is installed through the lower surface of the cooling box (3), the inner wall of the cavity of the protective shell (1) is fixedly connected to a support mounting plate (7), a transmission air pipe (8) is provided on the bottom surface of the cavity of the protective shell (1), the outer surface of the transmission air pipe (8) is fixedly connected to a stirring blade (9), and the outer surface of the transmission air pipe (8) is fixedly connected to an air outlet nozzle (10), and the surfaces on both sides of the lower end of the protective shell (1) are respectively installed with liquid inlet pipes. (11) and a liquid outlet pipe (12), the lower end side surface of the protective shell (1) is fixedly connected to a driving motor (13), the output end of the driving motor (13) is fixedly connected to a first transmission wheel (14), the upper end of the transmission air pipe (8) is penetrated by a second transmission wheel (15), a linkage cleaning mechanism is provided between the protective shell (1) and the cooling box (3), which drives the transmission cylinder (16) and the linkage disc (17) to rotate through the first transmission wheel (14), and then the linkage disc (17) pushes the supporting connecting rod (19) and the cleaning scraper (20) to move and clean the filter baffle (4) through the guide push rod (18), and an exhaust pipe (21) is penetrated by the upper surface of the protective shell (1).

2. The waste gas treatment device for thermal cracking of recycled waste plastics according to claim 1, characterized in that: The air inlet pipe (2) is fixedly connected to the cooling box (3), the circulating cooling water pipe (5) is of spiral design, and the water inlet and outlet ends of the circulating cooling water pipe (5) both penetrate the side surfaces of the protective shell (1) and the cooling box (3).

3. The waste gas treatment device for thermal cracking of recycled waste plastics according to claim 1 is characterized in that: The air guide pipe (6) passes through the upper end of the support mounting plate (7), and the surface of the support mounting plate (7) is provided with an air guide opening. The upper end of the transmission air pipe (8) passes through the lower surface of the support mounting plate (7), and the transmission air pipe (8) and the support mounting plate (7) are rotatably connected.

4. The waste gas treatment device for thermal cracking of recycled waste plastics according to claim 1, characterized in that: The stirring blade (9) is designed to be annular, and the vertical cross section of the stirring blade (9) is designed to be long strips. The air outlet nozzle (10) is arranged horizontally, and the air outlet nozzle (10) is designed to be inclined.

5. The waste gas treatment device for thermal cracking of recycled waste plastics according to claim 1, characterized in that: The first transmission wheel (14) is rotationally connected to the protective housing (1), the height of the first transmission wheel (14) is the same as the height of the second transmission wheel (15), and a belt is installed between the outer surface of the first transmission wheel (14) and the outer surface of the second transmission wheel (15).

6. The waste gas treatment device for thermal cracking of recycled waste plastics according to claim 1, characterized in that: The linkage cleaning mechanism comprises a transmission cylinder (16), the transmission cylinder (16) is fixedly connected to the upper end of the device of the first transmission wheel (14), the upper end of the transmission cylinder (16) is fixedly connected to a linkage disc (17), the upper surface of the linkage disc (17) is provided with a guide push rod (18), the upper end side surface of the protective shell (1) and the cooling box (3) is penetrated by a support link (19), and one end of the support link (19) is fixedly connected to a cleaning scraper (20).

7. The waste gas treatment device for thermal cracking of recycled waste plastics according to claim 6, characterized in that: The transmission cylinder (16) is coaxially arranged with the first transmission wheel (14), and the transmission cylinder (16) is rotationally connected with the protective housing (1).

8. The waste gas treatment device for thermal cracking of recycled waste plastics according to claim 6, characterized in that: The linkage disc (17) and the guide push rod (18) are rotationally connected, and the center of the linkage disc (17) and the axis of the guide push rod (18) are staggered.

9. The waste gas treatment device for thermal cracking of recycled waste plastics according to claim 6, characterized in that: The guide push rod (18) is rotatably connected to one end of the support connecting rod (19), and the support connecting rod (19) is slidably connected to the protective shell (1) and the cooling box (3).

10. The waste gas treatment device for thermal cracking of recycled waste plastics according to claim 6, characterized in that: The cleaning scraper (20) is in sliding connection with the cooling box (3), the cleaning scraper (20) is of inclined design, and a brush is provided on the lower surface of the cleaning scraper (20), and the brush of the cleaning scraper (20) is in contact with the filter baffle (4).

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