Asphalt pavement aggregate separation and regeneration equipment and separation method

Abstract

The invention discloses an asphalt pavement aggregate separation and regeneration device and a separation method, comprising a feed port, a crushing and separation mechanism, an aggregate cleaning box and an aggregate box; the crushing and separation mechanism comprises an inner and outer cylinder, a microwave heating device is arranged in the outer cylinder, a plurality of layers of multi-stage screening discs are arranged in the inner cylinder, and a plurality of stirring and crushing blades are connected between the screening discs at each level; the top of the crushing and separation mechanism is connected to the feed port, and the bottom is connected to the aggregate cleaning box; the bottom of the box is provided with a discharge port baffle supported by a clamping stick, and the bottom of the water tank is provided with a drainage port and a circulating water system connected to an impurity filter cylinder; the aggregate box is arranged on one side of the water tank and connected to the discharge port baffle. The equipment uses microwave heating to complete aggregate separation, remove residual impurities and broken small aggregate slag, and ensure efficient and high-quality recycling of aggregate. The separated aggregate can be used for road construction again, realizing the maximum utilization of resources. It has a simple process and high efficiency, and is suitable for mechanized road construction operations for regenerating old asphalt pavements.

Description

Technical Field

[0001] The invention relates to the field of waste treatment, in particular to the field of asphalt road aggregate separation and regeneration, and specifically to asphalt road aggregate separation and regeneration equipment. Background Art

[0002] With the accelerated development of industrialization and the increasing convenience of people's transportation, the number of highways in my country has continued to increase, and asphalt pavement is the main type of highway pavement. However, due to factors such as repeated vehicle loads, vehicle overloading, road construction, and the expiration of the service life, asphalt pavements can no longer be used, resulting in a large amount of construction waste. Therefore, how to deal with asphalt pavement waste will become a problem that must be faced and solved. In addition, the construction of new roads requires a large amount of aggregate. Apart from economic factors, natural resources are limited and cannot be mined without limit. The recycling of aggregates from old asphalt pavements can save a lot of mineral materials. Therefore, from the perspective of green energy conservation and environmental protection, the recycling and reuse of old asphalt pavement aggregates has very important practical significance.

[0003] Existing asphalt pavement regeneration mostly refers to the old asphalt pavement that cannot meet the pavement performance requirements. The old asphalt mixture is recovered by milling or digging, and then a certain amount of regeneration agent, additives, new aggregates and new asphalt are added for mixing, and then used again in road construction technology. However, this method has a large amount of asphalt and impurities in the rebuilt pavement, which greatly reduces the practical life of the regenerated pavement, and does not reuse the broken and abandoned asphalt pavement. Therefore, the efficient recycling of waste asphalt pavement aggregates has important practical significance. Summary of the invention

[0004] In order to solve the above-mentioned defects existing in the prior art, the purpose of the present invention is to provide an equipment for separating asphalt pavement aggregates, which utilizes microwave heating to achieve rapid heating and complete separation requirements, remove residual impurities and broken small aggregate slag, solve the existing problem of waste asphalt pavement garbage dumping, and realize efficient recycling of waste asphalt pavement aggregates, so as to achieve green, energy-saving and environmental protection.

[0005] The present invention is achieved through the following technical solutions.

[0006] An asphalt pavement aggregate separation and regeneration device comprises a feed inlet, a crushing and separation mechanism, an aggregate cleaning box and an aggregate box;

[0007] The crushing and separation mechanism is composed of two concentric cylinders nested inside and outside, the outer cylinder is provided with a microwave heating device; the inner cylinder is provided with a plurality of layers of multi-stage screening discs with different apertures coaxially connected by a motor, and a plurality of stirring and crushing blades are connected between the screening discs at each level;

[0008] The top of the crushing and separation mechanism is connected to the feed port, and the bottom is connected to the aggregate cleaning box;

[0009] The aggregate cleaning box is provided with a bottomless impurity filter cylinder, a high-pressure water spray head and a water baffle; the bottom of the impurity filter cylinder is provided with a discharge port baffle supported by a clamping rod, and the bottom of the clamping rod is hinged on the water tank; the bottom of the water tank is provided with a drain port and a circulating water system connected to the impurity filter cylinder; the aggregate box is arranged on one side of the water tank and docked with the discharge port baffle.

[0010] For the above technical solution, the present invention has a further preferred solution:

[0011] Preferably, a plurality of microwave heating devices are arranged circumferentially along the inner wall of the outer cylinder and are distributed on the inner wall of the outer cylinder at intervals from top to bottom.

[0012] Preferably, a plurality of stirring and crushing blades are arranged in a cross shape between the smooth-surfaced screening plates at each level, and the stirring and crushing blades are connected to the upper and lower screening plates through sleeve caps.

[0013] Preferably, the side wall of the inner cylinder is provided with holes, and an exhaust gas outlet and an impurity receiving annular groove are provided between the inner cylinder and the outer cylinder.

[0014] Preferably, the sieve holes of the sieve discs with different apertures decrease in diameter from top to bottom, and the apertures are set to 38-52 mm, 19-26 mm and 9.5-13 mm respectively.

[0015] Preferably, a funnel-shaped receiving port is provided on the upper portion of the aggregate cleaning box;

[0016] Preferably, the aggregate cleaning box is supported by a bracket, a circular ring with a radius slightly larger than the impurity filtering cylinder is provided at the bottom of the aggregate cleaning box, a circular track is provided below the circular ring, and the high-pressure water spray head and the water baffle are respectively arranged on the circular track relative to each other.

[0017] Preferably, one end of the discharge port baffle is hinged to the bottom of the impurity filter barrel, and the discharge port baffle includes a spherical crown bottom and a flat panel section. The spherical crown bottom corresponds to the circular bottom surface of the impurity filter barrel, and the bottom of the flat panel section is provided with a buckle that docks with the clamping rod, and the bottom of the clamping rod is hinged by a hinge arranged on the water tank.

[0018] Preferably, an impurity storage box is provided in the water tank, and the lower bottom plate of the impurity storage box contains sieve holes.

[0019] Preferably, a hemispherical filter is provided at the water inlet at the bottom of the water tank connected to the circulating water system.

[0020] Accordingly, the present invention further provides a method for separating and regenerating asphalt pavement aggregate, comprising:

[0021] S101: waste asphalt pavement enters the crushing and separation mechanism through the feed inlet;

[0022] S102: The microwave heating device starts to work, and the motor drives the multi-stage screening disc (204) to rotate at a speed of 8-14 r / min. The heated and damaged asphalt pavement aggregate is separated into fragments, which fall onto the secondary screening disc in sequence through the sieve holes of the sieve discs of different apertures at each stage. The asphalt pavement aggregate is heated by the microwave heating devices at each stage, and the asphalt pavement aggregate is broken by the stirring and crushing blades and falls onto the bottom sieve holes of the crushing and separation mechanism, and enters the aggregate cleaning box.

[0023] S103: Toxic gas generated by heating the asphalt is discharged from the exhaust gas outlet;

[0024] S104: The crushed and separated asphalt pavement aggregate enters the impurity filter cylinder and is cleaned by a plurality of high-pressure water spray heads spraying water in a circular direction;

[0025] S105: After the cleaning is completed, when the impurity filter cylinder contains enough asphalt pavement aggregate, the spherical crown of the discharge port baffle is pressed downward and deformed, the flat plate section is tilted upward, the clamping rod is separated from the buckle, the discharge port baffle hinged to the impurity filter cylinder is turned down, and the asphalt pavement aggregate slides into the aggregate box along the discharge port baffle;

[0026] S106: Asphalt pavement impurities fall into an impurity storage box and are removed;

[0027] S107: The cleaned wastewater is filtered through a hemispherical filter and then connected to the high-pressure water spray head of the impurity filter cartridge through a circulating water system for reuse.

[0028] The present invention adopts the above technical solution, which has the following beneficial effects:

[0029] The present invention uses microwave rapid overall heating to quickly separate the waste asphalt pavement fragments without destroying the strength of the aggregate, screen out the aggregate and impurities, and further remove the residual impurities and broken small aggregate slag; the screening plate and the crushing blade are detachable, and the different sieve holes of the multi-stage screening plate can separate the waste pavement aggregates of different grades step by step, ensuring the efficient and high-quality recycling of the aggregate. The separated aggregate can be used again for road construction, which reduces highway garbage while maximizing the utilization of resources. In addition, the equipment has a simple process and high efficiency, and can be used for flow operations and large-scale use. The device of the present invention has high efficiency and can be widely used, and is suitable for mechanized operations of regenerating old asphalt pavements for road construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings described herein are used to provide a further understanding of the present invention, constitute a part of the present application, and do not constitute an improper limitation of the present invention. In the drawings:

[0031] Figure 1 It is a schematic diagram of the overall equipment of the present invention;

[0032] Figure 2 It is a top view of the sieve plate of the screening mechanism;

[0033] Figure 3 It is a top view of the cross section of the upper part of the aggregate cleaning mechanism;

[0034] In the figure: 1-feeding port, 2-crushing and separation mechanism, 3-aggregate cleaning box, 4-aggregate box, 201-outer cylinder, 202-inner cylinder, 203-microwave heating device, 204-screening plate, 205-mixing and crushing blade, 206-cap, 207-impurity receiving ring groove, 208-main shaft, 208'-hexagonal ferrule, 209-waste exhaust port, 210-motor housing, 211-sieve hole, 212-electric Machine, 301-impurity filter cartridge, 302-water baffle, 303-funnel-shaped receiving port, 304-circulating water pipe, 305-drainage port, 306-high-pressure water spray head, 307-impurity storage box, 308-water tank, 309-discharge port baffle, 310-hemispherical filter screen, 311-circulating water system, 312-ring, 313-annular track, 314-buckle, 315-hinge, 316-clamp stick. DETAILED DESCRIPTION

[0035] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The exemplary embodiments and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0036] The asphalt pavement aggregate recycling equipment of the present invention comprises a feed port 1, a crushing and separation mechanism 2, an aggregate cleaning box 3 and an aggregate box 4. The feed port 1 is connected to the crushing and separation mechanism 2, and the crushing and separation mechanism 2 realizes the heating separation of the old asphalt pavement fragments. The aggregate cleaning box 3 is connected below the crushing and separation mechanism 2, and the aggregate at the separation port is discharged from the discharge port after being cleaned and impurities removed by the aggregate cleaning box, completing the separation and cleaning work.

[0037] This equipment is used to separate and process the aggregates of abandoned old asphalt crushed pavement. A microwave heating device and a stirring device are arranged in the separation device 2 to realize the rapid overall heating of the asphalt pavement aggregates and the complete separation of the aggregates without adhesion. Aged and coked asphalt residues and aggregate debris are discharged from the sieve holes and collected in the impurity annular groove or impurity storage box. After the separation is completed, the asphalt pavement aggregates fall from the last screening plate of the separation device into the aggregate cleaning cylinder 3, which is used to clean the impurities such as coked and aged asphalt adhering to the aggregates. After the cleaning is completed, the aggregates are discharged from the discharge port.

[0038] like Figure 1As shown, the crushing and separation mechanism is configured as two concentric cylinders nested inside and outside. The outer cylinder 201 is the overall outer shell of the crushing and separation mechanism. A plurality of microwave heating devices 203 are arranged on the inner wall of the outer cylinder. The plurality of microwave heating devices are arranged circumferentially along the inner wall of the outer cylinder and are distributed on the inner wall of the outer cylinder at intervals from top to bottom. An exhaust gas outlet 209 and an impurity receiving annular groove 207 are arranged between the inner cylinder 202 and the outer cylinder 201. The exhaust gas outlet 209 is arranged at the top to absorb and process the toxic gas generated during the heating process. The impurity receiving annular groove 207 is arranged at the bottom to receive impurities such as burnt asphalt and crushed aggregate slag from the sieve hole 211 of the inner cylinder 202. The inner cylinder 202 is a filtering and separating body, and holes are arranged around the inner cylinder. The inner cylinder contains a multi-stage screening disc 204 which is coaxially connected through a motor 212 but has different apertures and is detachable. The surface of each stage of the screening disc 204 is sufficiently smooth, and the apertures of the screen holes 211 of the multi-stage screening disc 204 are set to decrease in sequence from top to bottom; a plurality of stirring and crushing blades 205 are connected between each stage of the screening disc, such as Figure 2 As shown, a plurality of stirring and crushing blades 205 are arranged in a cross shape between the screening plates at each level, and the stirring and crushing blades 205 are connected to the upper and lower screening plates through sleeve caps 206 .

[0039] The upper side of the crushing and separation mechanism is connected to the feed port 1, receives the material from the feed port, and completes the separation requirement of the adhesion aggregate after microwave heating, and prevents the emission of harmful gases.

[0040] The bottom of the crushing and separation mechanism is connected to the aggregate cleaning box 3, and a funnel-shaped receiving port 303 is arranged on the upper part of the aggregate cleaning box 3 to ensure that the aggregate cleaning cylinder 3 can receive all the aggregates and impurities from the crushing and separation mechanism 2. Among them, the motor 212 is fixed by the motor housing 210, and the motor housing 210 is made of high temperature resistant and waterproof material; the upper top surface of the motor housing 210 is a spherical crown structure, so that the aggregates or impurities falling on the housing can slide into the cleaning box 3 below.

[0041] The aggregate cleaning box 3 is supported by a bracket and is provided with a bottomless impurity filter cartridge 301, a high-pressure water spray head 306, a water baffle 302, a circulating water system 311, etc. Figure 3As shown, a ring 312 with a radius slightly larger than the impurity filter cartridge 301 is provided at the bottom of the aggregate cleaning box 3, and a circular track 313 is provided below the ring 312. A high-pressure water spray head 306 is provided on one side of the circular track 313, and a water baffle 302 is provided on the other side. The water baffle 302 and the mounting strip for mounting the high-pressure water spray head 306 are fixedly connected to the central ring 312 concentric with the impurity filter cartridge 301. The water baffle 302 is a fan-shaped baffle with a central angle of 120°, which can completely block the water sprayed from the opposite side of the high-pressure water head 306 after cleaning the aggregate impurities. The ring 312 can rotate along the circular track 313, and the water baffle 302 is directly opposite to the strip-shaped high-pressure water spray head 306, driving the high-pressure water spray faucet 306 and the water baffle 302 to rotate together, which is convenient for the cleaning of aggregates and the discharge of aggregates from the discharge port. The high-pressure water spray head 306 is used to clean impurities on the surface of separated aggregates and filter waste materials such as burnt asphalt and crushed aggregates.

[0042] A push-pull impurity storage box 307 is provided on the upper part of the water tank 308 of the aggregate cleaning box 3 to facilitate the discharge and cleaning of impurities. The lower bottom plate of the impurity storage box 307 contains sieve holes to facilitate the recycling of water into the water circulation system 311. The water tank 308 is connected to the water circulation system 311 through the circulating water pipe 304. The outlet of the water tank 308 is provided with a hemispherical filter 310 opposite to the water flow to prevent the filtered impurities from entering the recycled water and blocking the water flow pipe and the nozzle. A drain port 305 is also provided at the bottom of the water tank 308.

[0043] Among them, all materials in the crushing and separation mechanism 2 are resistant to high temperatures, and the material of the inner cylinder 202 is microwave-permeable, and the outer cylinder 202 is isolated from microwave radiation. The crushing and separation mechanism 2 uses a microwave heating device 203, which heats quickly, takes a short time, and does not damage the aggregate to be recycled. A detachable impurity receiving annular groove 208 is provided between the inner cylinder 202 and the outer cylinder 201 of the crushing and separation mechanism to receive impurities such as burnt asphalt from the sieve holes of the inner cylinder 202. The power and time of the microwave heating device 203 corresponding to the screening space of each level of the filter disc 204 can be adjusted separately, and different heating times and heating powers can be set for different fragment volumes, so as to achieve energy saving and economy to the greatest extent. The sieve hole diameter in the screening disc 204 decreases from top to bottom, and the sieve hole diameter of the last level of the screening disc is related to the material grading diameter to ensure complete separation of the material. The cap 206 on the three-level screening disc 204 facilitates the connection and disassembly of each screening disc and the stirring and crushing blade. The main shaft 208 on the motor 212 drives the screening disc 204 to rotate, thereby driving the stirring and crushing blades 205 to move, and the stirring and crushing blades of each level of the screening disc 204 can alleviate the torsional damage of the rotating main shaft 208 to a certain extent when rotating and stirring together with the main shaft 208; the main shaft 208 and the screening disc are movably connected through the hexagonal sleeve 208', which is convenient for disassembly and replacement of screening discs of different particle sizes.

[0044] The bottom of the impurity filter cylinder 301 is provided with a discharge port baffle 309, which is hinged to the water tank 308 and can be rotated and opened along the hinge point. The discharge port baffle 309 is formed by consolidating a spherical crown and a flat plate section extending beyond the bottom of the spherical crown. The bottom of the spherical crown corresponds to the circular bottom surface of the filter cylinder. The discharge port baffle extends beyond the bottom of the flat plate and contains a buckle 314 that docks with a clamping rod 316. The other end of the clamping rod 316 is hinged through a hinge 315 provided on the water tank 308. When there is enough aggregate in the impurity filter cylinder, the spherical crown of the discharge port baffle 309 is pressed down and deformed, and the flat plate extending beyond the flat plate is tilted. The clamping rod 316 is separated from the buckle 314, the discharge port is opened, and the aggregate slides into the aggregate box 4 along the discharge port baffle 309.

[0045] In one embodiment, the screening disc 204 is divided into three levels, and the sizes of the screen holes of the screening disc 204 are set to be: 38-52 mm, 19-26 mm, and 9.5-13 mm, respectively.

[0046] The following is a processing method using the above-mentioned equipment, comprising the following steps:

[0047] S101: waste asphalt pavement enters the crushing and separation mechanism 2 through the feed port 1;

[0048] S102: The broken pieces are located on the upper side of the first-stage screening plate due to their large particle size and cannot be filtered to the next-stage screening plate;

[0049] S103: The first-stage microwave heating device starts to work. At the same time, the motor drives the main shaft to rotate at a speed of 8-14r / min, driving the screening plate and the mixing and crushing blades to rotate. The surface of the screening plate is smooth enough. The heated road asphalt is destroyed, softened and loses its viscosity. The asphalt road aggregate is separated, and the fragments become smaller and fall from the sieve holes of the first-stage screening plate to the second-stage screening plate.

[0050] S104: The aggregate on the upper side of the secondary screening plate is stirred by the secondary microwave heater and the stirring and crushing blades, and falls to the upper side of the tertiary screening plate.

[0051] S105: The aggregate on the upper side of the three-stage screening plate is stirred by the three-stage microwave heater and the stirring and crushing blades, and after being completely separated, falls into the aggregate cleaning box. The toxic gas generated by heating the asphalt in steps S103-S105 is discharged from the exhaust port for treatment.

[0052] S106: After the separated stones enter the impurity filter cylinder of the aggregate cleaning box, the high-pressure water spray head starts to spray water in a circular direction. The water baffle prevents water from splashing during the cleaning process, and keeps the water splashed on it in the aggregate cleaning box for water recycling. Note that the ring to which the water baffle and the high-pressure water spray head are fixed can rotate around the center of the circle on the circular track, so the direction can be changed to clean the aggregate if necessary.

[0053] S107: After the cleaning is completed, when the impurity filter cylinder contains enough asphalt pavement aggregate, the spherical crown of the discharge port baffle is pressed downward and deformed, the flat plate section is tilted upward, the clamping rod is separated from the buckle, the discharge port baffle hinged to the impurity filter cylinder is turned down, and the asphalt pavement aggregate slides into the aggregate box along the discharge port baffle;

[0054] S106: Asphalt pavement impurities fall into an impurity storage box and are removed;

[0055] S107: The cleaned wastewater is filtered through a hemispherical filter screen and then connected to the high-pressure water spray head of the impurity filter cartridge (301) through a circulating water system for reuse.

[0056] After that, if the aggregate needs to be separated by particle size, a screening net can be set at the discharge port to complete the screening of coarse and fine aggregates. A small amount of asphalt adhering to the surface of the aggregate after cleaning does not affect the reuse of the aggregate.

[0057] The various steps in this process do not affect each other and can be carried out simultaneously in an assembly line for mechanized production.

[0058] Matters not covered by the present invention are known technologies.

[0059] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. An asphalt pavement aggregate separation and regeneration device, characterized in that: It comprises a feed inlet (1), a crushing and separation mechanism (2), an aggregate cleaning box (3) and an aggregate box (4); The crushing and separation mechanism (2) is composed of two concentric cylinders nested inside and outside, wherein a microwave heating device (203) is provided in the outer cylinder (201); a plurality of layers of multi-stage screening discs (204) with different apertures and coaxially connected via a motor (212) are provided in the inner cylinder (202), and a plurality of stirring and crushing blades (205) are connected between each level of the screening discs; The crushing and separation mechanism (2) is connected to the feed port (1) at the top and to the aggregate cleaning box (3) at the bottom; The aggregate cleaning box (3) is provided with a bottomless impurity filter cylinder (301), a high-pressure water spray head (306) and a water baffle (302); the bottom of the impurity filter cylinder (301) is provided with a discharge port baffle (309) supported by a clamping rod (316), and the bottom of the clamping rod (316) is hinged on the water tank (308); the bottom of the water tank (308) is provided with a drain port (305) and a circulating water system (311) connected to the impurity filter cylinder (301); the aggregate box (4) is provided on one side of the water tank (308) and is connected to the discharge port baffle (309).

2. The asphalt pavement aggregate separation and regeneration equipment according to claim 1, characterized in that: A plurality of microwave heating devices (203) are arranged circumferentially along the inner wall of the outer cylinder and are distributed at intervals from top to bottom on the inner wall of the outer cylinder.

3. The asphalt pavement aggregate separation and regeneration equipment according to claim 1, characterized in that: A plurality of stirring and crushing blades (205) are arranged in a cross shape between the smooth-surfaced screening discs (204) of various levels. The stirring and crushing blades (205) are connected to the upper and lower screening discs (204) through sleeve caps (206).

4. The asphalt pavement aggregate separation and regeneration equipment according to claim 1, characterized in that: The apertures of the sieve holes (211) of the sieve discs (204) with different apertures decrease in sequence, and the apertures are set to 38-52 mm, 19-26 mm, and 9.5-13 mm, respectively.

5. The asphalt pavement aggregate separation and regeneration equipment according to claim 1, characterized in that: The side wall of the inner cylinder (202) is provided with holes, and an exhaust gas outlet (209) and an impurity receiving annular groove (207) are provided between the inner cylinder (202) and the outer cylinder (201).

6. The asphalt pavement aggregate separation and regeneration equipment according to claim 1, characterized in that: A funnel-shaped receiving opening (303) is provided on the upper part of the aggregate cleaning box (3); The aggregate cleaning box (3) is supported by a bracket. A circular ring (312) having a radius slightly larger than that of the impurity filtering cylinder (301) is provided at the bottom of the aggregate cleaning box (3). A circular track (313) is provided below the circular ring (312). The high-pressure water spray head (306) and the water baffle (302) are respectively arranged on the circular track (313) in a relative manner.

7. The asphalt pavement aggregate separation and regeneration equipment according to claim 1, characterized in that: One end of the discharge port baffle (309) is hinged to the bottom of the impurity filter barrel (301), and the discharge port baffle (309) comprises a spherical crown bottom and a flat plate section, the spherical crown bottom corresponds to the circular bottom surface of the impurity filter barrel (301), and a buckle (314) is provided at the bottom of the flat plate section for docking with a clamping rod (316), and the bottom of the clamping rod (316) is hinged via a hinge (315) provided on the water tank (308).

8. The asphalt pavement aggregate separation and regeneration equipment according to claim 1, characterized in that: An impurity storage box (307) is provided in the water tank (308), and the lower bottom plate of the impurity storage box (307) has sieve holes.

9. The asphalt pavement aggregate separation and regeneration equipment according to claim 1, characterized in that: A hemispherical filter screen (310) is provided at the water inlet at the bottom of the water tank (308) which is connected to the circulating water system (311).

10. A method for separating and regenerating asphalt pavement aggregates using the asphalt pavement aggregate separation and regeneration equipment according to any one of claims 1 to 9, characterized in that: The steps include: S101: waste asphalt pavement enters the crushing and separation mechanism (2) through the feed inlet (1); S102: The first-stage microwave heating device starts to work, and the motor (212) drives the multi-stage screening disc (204) to rotate at a speed of 8-14 r / min. The heated and damaged asphalt pavement aggregate is separated into fragments, which fall onto the secondary screening disc in sequence through the sieve holes of the sieve discs of different apertures. The asphalt pavement aggregate is heated by the microwave heating devices (203) of each stage, and is broken by the stirring and crushing blades (205) and falls onto the bottom sieve holes of the crushing and separation mechanism (2), and enters the aggregate cleaning box (3); S103: Toxic gas generated by heating the asphalt is discharged from the exhaust gas outlet (209); S104: the crushed and separated asphalt pavement aggregate enters the impurity filter cylinder (301) and is cleaned by a plurality of high-pressure water spray heads (306) spraying water in a circular direction; S105: After the cleaning is completed, when the impurity filter cylinder (301) contains enough asphalt pavement aggregate, the spherical crown of the discharge port baffle (309) is pressed downward and deformed, the flat plate section is tilted upward, the clamping rod (316) is separated from the buckle (314), the discharge port baffle (309) hinged to the impurity filter cylinder (301) is turned down, and the asphalt pavement aggregate slides along the discharge port baffle (309) into the aggregate box (4); S106: Asphalt pavement impurities fall into the impurity storage box (307) and are removed; S107: The cleaned wastewater is filtered through the hemispherical filter (310) and then connected to the high-pressure water spray head (306) of the impurity filter cartridge (301) through the circulating water system (311) for reuse.

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