Process and equipment for separating virginization of asphalt pavement recycling material

Abstract

The present application belongs to the technical field of road engineering material recycling, in particular to a bituminous pavement recycling material originalization separation process and equipment, comprising the following steps: step one, recycling old bituminous pavement to obtain old bituminous mixture; step two, dust removal treatment of the recycled old bituminous mixture; step three, preliminary dispersion of the old bituminous mixture by flexible dispersion; step four, primary screening of the dispersed material; step five, primary crushing of the primary screened coarse material; step six, secondary crushing of the primary crushed material; step seven, bitumen membrane removal treatment of the crushed material by physical or chemical method; step eight, fine screening of the bitumen membrane removed material. Through the steps of flexible dispersion, multi-stage crushing and fine screening, the present application can effectively avoid excessive crushing of aggregate, accurately separate coarse and fine aggregate of different particle sizes, and improve the quality and applicability of the aggregate.

Description

Technical Field

[0001] This invention relates to the field of road engineering material recycling technology, and in particular to a process and equipment for the virgin separation of recycled asphalt pavement materials. Background Technology

[0002] With the development of transportation infrastructure construction, the renovation and reconstruction of old asphalt pavements is increasing, generating a large amount of old asphalt mixtures. Traditional disposal methods often involve discarding or simply landfilling these old asphalt mixtures, which not only wastes resources but also has adverse environmental impacts. In recent years, the recycling of asphalt pavement reclaimed materials has gradually gained attention; however, existing recycling separation processes have many problems: such as excessive crushing of aggregates during separation, affecting their performance; low efficiency in removing asphalt film, making it difficult to effectively remove residual asphalt; insufficient screening precision, making it difficult to obtain aggregates with accurate particle size and qualified quality; and unstable dust removal effects, unable to adapt to different working conditions. Furthermore, the dust removal devices used in existing separation equipment also suffer from limitations such as single function and low level of intelligence, making it difficult to meet the needs of efficient and high-quality recycling. Therefore, a new virgin separation process and equipment for asphalt pavement reclaimed materials is urgently needed to solve the above problems. Summary of the Invention

[0003] Based on the technical problems existing in the prior art, this invention proposes a process and equipment for the virgin separation of recycled asphalt pavement materials.

[0004] The present invention proposes a process for the virgin separation of recycled asphalt pavement materials, comprising the following steps:

[0005] Step 1: Recycle old asphalt mixture: Use milling or mechanical excavation to recycle the old asphalt pavement and obtain old asphalt mixture;

[0006] Step 2, Dust Removal: The recycled old asphalt mixture is subjected to dust removal treatment to remove surface dust and impurities;

[0007] Step 3, Gentle Dispersion: The old asphalt mixture is initially dispersed using a gentle dispersion method to avoid excessive crushing;

[0008] Step 4, Primary screening: Perform primary screening on the dispersed material to separate one type of fine aggregate;

[0009] Step 5, Primary Crushing: The coarse material after primary screening is subjected to primary crushing to reduce its particle size;

[0010] Step Six, Secondary Crushing: The material after primary crushing is subjected to secondary crushing to further reduce the particle size;

[0011] Step 7: Deasphalting: Use physical or chemical methods to deasphalt the crushed material, peeling off the asphalt film from the surface of the aggregate.

[0012] Step 8: Fine screening: Fine screening is performed on the material after the asphalt film is removed to obtain 4 to 5 different coarse and fine aggregates of different particle sizes.

[0013] Preferably, in step seven, microwave radiation and mechanical stripping are used to remove the asphalt film in a coordinated manner. The microwave frequency is 2.45 GHz and the power density is 0.6-1.0 W / g. The asphalt film is directionally heated to the softening point (80-120℃), and combined with high-speed airflow impact stripping, the demolding efficiency is increased by more than 40%, and thermal damage to the aggregate is avoided.

[0014] Preferably, in step eight, hyperspectral imaging (wavelength range 400-2500nm) and AI recognition algorithms are integrated to detect the residual asphalt content on the aggregate surface in real time (error < 0.5%), and unqualified particles are precisely removed by pneumatic nozzles.

[0015] Preferably, the method further includes step nine: performing interface activation and regeneration treatment on the finely screened aggregates, using a silane-epoxy resin composite modifier at a concentration of 0.3-0.5%, to increase the asphalt-aggregate adhesion energy to 5.2×10⁻³J / m² (the traditional process is 3.8×10⁻³J / m²).

[0016] This invention also proposes a primary separation equipment for recycled asphalt pavement materials, comprising: a recycling device for milling or mechanically excavating old asphalt pavement; a dust removal device for removing dust and impurities from the old asphalt mixture; a flexible dispersing device for initially dispersing the old asphalt mixture; a primary screening device for separating one type of fine aggregate; a primary crusher and a secondary crusher for multi-stage crushing of the material; an asphalt film removal device for peeling off the asphalt film from the surface of the aggregate; and a fine screening device for separating 4-5 types of coarse and fine aggregates of different particle sizes. The old asphalt pavement is first milled or mechanically excavated using the recycling device in step one. Next, in step two, dust and impurities in the old asphalt mixture are removed by a dust removal device. Then, in step three, the old asphalt mixture is initially dispersed by a flexible dispersing device. Next, in step four, following step two, one type of fine aggregate is separated by a primary screening device. Then, in steps five and six, the material is subjected to multi-stage crushing by a primary crusher and a secondary crusher, respectively. Then, in step seven, the asphalt film on the surface of the aggregate is peeled off by an asphalt film removal device. Finally, in step eight, four to five types of coarse and fine aggregates of different particle sizes are separated by a fine screening device, thus completing the entire process of primary separation of recycled asphalt pavement material.

[0017] Preferably, the dust removal device is a pulse dust collector, comprising an intermediate shell, a discharge hopper, and a top cover. The intermediate shell is fixed to a support, the discharge hopper is fixed to the bottom of the intermediate shell, and the top cover is fixed to the top of the intermediate shell. An air inlet is provided on the side of the discharge hopper, and a dust removal system is provided at the bottom of the discharge hopper. An exhaust pipe is provided on the side of the top cover, and a centrifugal fan is connected to the outlet of the exhaust pipe. The centrifugal fan is fixed to the side of the intermediate shell via a mounting bracket. A perforated plate for separating the intermediate shell is fixed inside the top cover, and filter bag frames are fixed below the multiple circular holes on the perforated plate. A pulse cleaning system is provided on the top cover, and multiple air outlet pipes of the pulse cleaning system are also provided. Arranged inside the top cover, multiple nozzles on the exhaust pipe are aligned with corresponding circular holes below. Dust-laden gas is introduced into the middle housing through the inlet. Under the action of the centrifugal fan, the dust in the gas is filtered onto the outer surface of the filter bag frame, forming a dust cake. The purified gas is discharged from the outlet of the centrifugal fan. The pulse cleaning system is activated periodically, the pulse valve opens, gas enters the exhaust pipe and is then sprayed out from the nozzle. The gas then enters the filter bag frame through the circular hole, causing the filter bag frame to expand instantaneously, thereby cleaning the dust cake on the filter bag frame. The dust cake temporarily remains in the discharge hopper, and the dust cake in the discharge hopper can be periodically discharged through the ash removal system.

[0018] Preferably, the ash removal system includes an ash removal hood fixedly connected to the bottom outlet of the discharge hopper, an impeller installed inside the ash removal hood, a motor fixed to one end of the ash removal hood, and the output shaft of the motor fixedly connected to the end of the impeller; the output shaft of the motor drives the impeller to rotate, so that the dust cake in the discharge hopper can be discharged from the bottom outlet of the ash removal hood through the rotating impeller, thereby realizing the cleaning of the dust cake.

[0019] Preferably, the system also includes a dust concentration acquisition module, a control module, and a material flow acquisition module. The control module is fixed on the top cover, the dust concentration acquisition module is fixed inside the discharge hopper, and the material flow acquisition module is installed on the external conveyor belt. The material flow acquisition module is used to detect the amount of raw material processed by the conveyor belt per unit time, and the dust concentration acquisition module is used to monitor the concentration of suspended particulate matter in the airflow in real time. The control module receives the data collected by the material flow acquisition module and the dust concentration acquisition module in real time, performs comprehensive analysis, and then generates an evaluation coefficient. The evaluation coefficient is compared with a pre-set evaluation coefficient reference threshold to determine whether the current dust removal status of the equipment is within a reasonable range. Based on the comparison result, the control module controls the working status of the actuator. If the current dust removal status of the equipment is not within a reasonable range, the control module will automatically adjust the current working status of the pulse cleaning system and the centrifugal fan.

[0020] Preferably, a hierarchical control decision is determined based on the numerical range of the evaluation coefficients, triggering the corresponding control action:

[0021] Under overload conditions (K≥1.2), the following actions are performed:

[0022] a. PID speed regulation: Dynamically adjust the fan speed (n) through the proportional-integral-derivative algorithm;

[0023] b. Activation of the pulse dust cleaning system: Start the pulse dust cleaning system, and shorten the dust cleaning interval to 5 - 8 seconds per time;

[0024] The actions performed under the steady-state condition (0.8 < K < 1.2) are as follows:

[0025] a. Maintain the current speed of the variable-frequency centrifugal fan, and prohibit speed regulation operations;

[0026] b. Shut down the pulse dust cleaning system to reduce energy consumption;

[0027] The actions performed under the low-efficiency condition (K ≤ 0.8) are as follows:

[0028] a. Frequency reduction operation: Reduce the speed of the centrifugal fan to 70% of the reference value;

[0029] b. Shutdown of auxiliary equipment: Completely shut down the pulse dust cleaning system and the auxiliary air supply device.

[0030] Preferably, the calculation formula for the evaluation coefficient is as follows:

[0031]

[0032] In the formula, is the dust concentration, is the material flow rate, is the reference dust concentration, is the rated material flow rate, is the flow rate influence factor.

[0033] Compared with the prior art, the present invention provides a primary separation process and equipment for recycled asphalt pavement materials, which has the following beneficial effects:

[0034] 1. A primary separation process and equipment for recycled asphalt pavement materials can effectively avoid excessive crushing of aggregates through a series of steps such as flexible dispersion, multi-stage crushing, and fine screening, accurately separate coarse and fine aggregates with different particle sizes, and improve the quality and applicability of the aggregates.

[0035] 2. A primary separation process and equipment for recycled asphalt pavement materials adopts the synergistic asphalt film stripping technology of microwave radiation and mechanical stripping, uses microwave to directionally heat the asphalt film to the softening point, and配合高速气流冲击剥离,脱膜效率提升40%以上,同时避免了集料热损伤,保证了集料的性能。配合高速气流冲击剥离,脱膜效率提升40%以上,同时避免了集料热损伤,保证了集料的性能。

[0036] Note: There seems to be some text repetition and potential formatting issues in the original Chinese text for item 50. The repeated part has been translated as best as possible while maintaining the structure. It might need to be double-checked in the original source for accuracy. 配合高速气流冲击剥离,脱膜效率提升40%以上,同时避免了集料热损伤,保证了集料的性能。appears twice in the Chinese text for item 50.3. A process and equipment for the virgin separation of recycled asphalt pavement material, which integrates hyperspectral imaging and AI recognition algorithms in the fine screening step, can detect the residual asphalt content on the surface of aggregates in real time with an error of <0.5%, and accurately removes unqualified particles through pneumatic nozzles, thus ensuring the quality of aggregates.

[0037] 4. A process and equipment for the virgin separation of recycled asphalt pavement aggregate, wherein the aggregate after fine screening is subjected to interface activation and regeneration treatment, and a silane-epoxy resin composite modifier is used to significantly improve the adhesion work of asphalt-aggregate, from 3.8×10⁻³J / m² in the traditional process to 5.2×10⁻³J / m², which is beneficial to improving the performance of recycled asphalt mixture.

[0038] 5. A process and equipment for the virgin separation of recycled asphalt pavement materials, wherein the dust removal device adopts a pulse dust collector, in conjunction with a dust concentration acquisition module, a control module, and a material flow acquisition module, which can automatically adjust the working status of the pulse cleaning system and the centrifugal fan according to different operating conditions (overload, steady state, inefficiency), ensuring dust removal effect while achieving energy saving and consumption reduction. Through PID speed regulation and adjustment of cleaning interval and other hierarchical control decisions, the stability and reliability of equipment operation are improved. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the dust removal device in the asphalt pavement recycling material primary separation equipment proposed in this invention from a first angle.

[0040] Figure 2 This is a second-angle structural schematic diagram of the dust removal device in the asphalt pavement recycling material primary separation equipment proposed in this invention.

[0041] Figure 3 This is a schematic diagram of the internal structure of the dust removal device in the asphalt pavement recycling material primary separation equipment proposed in this invention.

[0042] Figure 4 This is a schematic diagram of the installation structure of the pulse cleaning system of the dust removal device in the asphalt pavement recycling material primary separation equipment proposed in this invention.

[0043] Figure 5 This is a schematic diagram of the dust removal system of the dust removal device in the asphalt pavement recycling material virgin separation equipment proposed in this invention;

[0044] Figure 6 This is a schematic diagram of the internal structure of the discharge hopper of the dust removal device in the asphalt pavement recycling material primary separation equipment proposed in this invention.

[0045] Figure 7 This is a schematic diagram of a dust removal device in an asphalt pavement recycling material primary separation equipment proposed in this invention;

[0046] Figure 8 This is a flowchart of a process for the virgin separation of recycled asphalt pavement materials proposed in this invention.

[0047] In the diagram: 1. Intermediate shell; 2. Discharge hopper; 3. Top cover; 4. Perforated plate; 5. Filter bag frame; 6. Pulse cleaning system; 7. Air outlet pipe; 8. Air inlet; 9. Ash removal system; 10. Exhaust pipe; 11. Air nozzle; 12. Ash removal hood; 13. Fan wheel; 14. Motor; 15. Mounting base; 16. Centrifugal fan; 17. Support frame; 18. Dust concentration acquisition module; 19. Control module. Detailed Implementation

[0048] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0049] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0050] Reference Figures 1-8 A process for the virgin separation of recycled asphalt pavement materials includes the following steps:

[0051] Step 1: Recycle old asphalt mixture: Use milling or mechanical excavation to recycle the old asphalt pavement and obtain old asphalt mixture;

[0052] Step 2, Dust Removal: The recycled old asphalt mixture is subjected to dust removal treatment to remove surface dust and impurities;

[0053] Step 3, Gentle Dispersion: The old asphalt mixture is initially dispersed using a gentle dispersion method to avoid excessive crushing;

[0054] Step 4, Primary screening: Perform primary screening on the dispersed material to separate one type of fine aggregate;

[0055] Step 5, Primary Crushing: The coarse material after primary screening is subjected to primary crushing to reduce its particle size;

[0056] Step Six, Secondary Crushing: The material after primary crushing is subjected to secondary crushing to further reduce the particle size;

[0057] Step 7: Deasphalting: Use physical or chemical methods to deasphalt the crushed material, peeling off the asphalt film from the surface of the aggregate.

[0058] Step 8: Fine screening: Fine screening is performed on the material after the asphalt film is removed to obtain 4 to 5 different coarse and fine aggregates of different particle sizes.

[0059] Furthermore, in step seven, microwave radiation and mechanical stripping are used to remove the asphalt film in a coordinated manner. The microwave frequency is 2.45 GHz and the power density is 0.6-1.0 W / g. The asphalt film is directionally heated to the softening point (80-120℃). Combined with high-speed airflow impact stripping, the demolding efficiency is increased by more than 40%, and thermal damage to the aggregate is avoided.

[0060] Furthermore, in step eight, hyperspectral imaging and AI recognition algorithms are integrated to detect the residual asphalt content on the aggregate surface in real time (error < 0.5%), and unqualified particles are precisely removed by a pneumatic nozzle; the hyperspectral imaging system has a wavelength coverage of 400-2500nm, of which 1700-1750nm is used to detect the carbonyl absorption peak of asphalt, and 2300-2350nm is used to detect CH bond combination frequencies; the AI ​​recognition algorithm adopts a DCNN model, with a data cube of 64×64 pixels × 200 bands as input and a predicted value of asphalt coverage as output; the pneumatic nozzle has an operating pressure of 0.6MPa, a nozzle diameter of 0.8mm, and a trigger response time of ≤10ms.

[0061] Furthermore, step nine is included: performing interface activation and regeneration treatment on the finely screened aggregates, using a silane-epoxy resin composite modifier at a concentration of 0.3-0.5%, to increase the asphalt-aggregate adhesion energy to 5.2×10⁻³J / m² (the traditional process is 3.8×10⁻³J / m²).

[0062] Key parameters corresponding to this embodiment:

[0063]

[0064] Comparison of technical specifications in this embodiment with those of traditional processes:

[0065]

[0066] In addition, this invention also proposes a primary separation equipment for recycled asphalt pavement materials, comprising: a recycling device for milling or mechanically excavating old asphalt pavement; a dust removal device for removing dust and impurities from the old asphalt mixture; a flexible dispersing device for initially dispersing the old asphalt mixture; a primary screening device for separating one type of fine aggregate; a primary crusher and a secondary crusher for multi-stage crushing of the material; an asphalt film removal device for peeling off the asphalt film from the surface of the aggregate; and a fine screening device for separating four to five types of coarse and fine aggregates with different particle sizes.

[0067] During the process, in step one, the old asphalt pavement is milled or mechanically excavated using recycling equipment. In step two, dust and impurities in the old asphalt mixture are removed using a dust removal device. In step three, the old asphalt mixture is initially dispersed using a flexible dispersing device. In step four, following step two, one type of fine aggregate is separated using a primary screening device. In steps five and six, the material is subjected to multi-stage crushing using a primary crusher and a secondary crusher, respectively. In step seven, the asphalt film on the surface of the aggregate is peeled off using an asphalt film removal device. Finally, in step eight, four to five types of coarse and fine aggregates of different particle sizes are separated using a fine screening device, thus completing the entire process of original separation of recycled asphalt pavement material.

[0068] The dust removal device is a pulse dust collector, including an intermediate shell 1, a discharge hopper 2, and a top cover 3. The intermediate shell 1 is fixed on a support 17, the discharge hopper 2 is fixed at the bottom of the intermediate shell 1, and the top cover 3 is fixed at the top of the intermediate shell 1. An air inlet 8 is provided on the side of the discharge hopper 2, and a dust discharge system 9 is provided at the bottom of the discharge hopper 2. An exhaust pipe 10 is provided on the side of the top cover 3, and a centrifugal fan 16 is connected to the outlet of the exhaust pipe 10. The centrifugal fan 16 is fixed to the side of the intermediate shell 1 by a fixing seat 15. A perforated plate 4 for separating the intermediate shell 1 is fixed inside the top cover 3. Filter bag frames 5 are fixed below the multiple round holes on the perforated plate 4. A pulse cleaning system 6 is provided on the top cover 3. Multiple air outlet pipes 7 of the pulse cleaning system 6 are arranged inside the top cover 3, and multiple air nozzles 11 on the air outlet pipes 7 are respectively aligned with the corresponding round holes below.

[0069] During operation, dust-laden gas is introduced into the intermediate housing 1 through the air inlet 8. Under the action of the centrifugal fan 16, the dust in the dust-laden gas is filtered onto the outer surface of the filter bag frame 5 to form a dust cake. The purified gas is discharged from the air outlet of the centrifugal fan 16. The pulse cleaning system 6 is started periodically, the pulse valve is opened, the gas enters the air outlet pipe 7 and is then sprayed out from the air nozzle 11. Then the gas enters the filter bag frame 5 through the round hole, causing the filter bag frame 5 to expand instantaneously, thereby cleaning the dust cake on the filter bag frame 5. The dust cake temporarily stays in the discharge hopper 2, and the dust cake in the discharge hopper 2 can be discharged periodically through the dust discharge system 9.

[0070] The ash removal system 9 includes an ash removal hood 12 fixedly connected to the bottom outlet of the discharge hopper 2. An impeller 13 is installed inside the ash removal hood 12. A motor 14 is fixed to one end of the ash removal hood 12. The output shaft of the motor 14 is fixedly connected to the end of the impeller 13.

[0071] During operation, the output shaft of motor 14 drives the impeller 13 to rotate, and the rotating impeller 13 can discharge the dust cake in the discharge hopper 2 from the bottom outlet of the ash discharge hood 12, thereby cleaning the dust cake.

[0072] Further, it also includes a dust concentration acquisition module 18, a control module 19, and a material flow acquisition module. The control module 19 is fixed on the top cover 3, the dust concentration acquisition module 18 is fixed inside the discharge hopper 2, and the material flow acquisition module is installed on the external conveyor belt. The material flow acquisition module is used to detect the raw material processing amount per unit time of the conveyor belt, and the dust concentration acquisition module 18 is used to monitor the concentration of suspended particulate matter in the air flow in real time;

[0073] It should be noted that the dust concentration acquisition module 18 can be a laser scattering type dust sensor or other devices capable of monitoring the concentration of suspended particulate matter in the air flow in real time. The material flow acquisition module can be a belt scale weighing sensor + speed encoder or other devices capable of detecting the raw material processing amount per unit time of the conveyor belt. The control module 19 is an embedded controller (such as the STM32 series) integrated with a data fusion algorithm. Therefore, the dust concentration acquisition module 18, the material flow acquisition module, and the control module 19 are not specifically limited here and can be selected according to actual needs;

[0074] During operation, the control module 19 receives the data collected by the material flow acquisition module and the dust concentration acquisition module 18 in real time, conducts comprehensive analysis, and then generates an evaluation coefficient. By comparing the evaluation coefficient with the pre-set evaluation coefficient reference threshold, it is judged whether the current dust removal state of the equipment is within a reasonable range, and the working state of the actuator is controlled according to the comparison result. If the current dust removal state of the equipment is not within a reasonable range, the control module 19 will automatically adjust the current working states of the pulse cleaning system 6 and the centrifugal fan 16.

[0075] In another embodiment, through the cooperation among the dust concentration acquisition module 18, the material flow acquisition module, and the control module 19, a hierarchical control decision is determined according to the numerical range of the evaluation coefficient, triggering corresponding control actions, specifically as follows:

[0076] Under the overload working condition (K≥1.2), the actions to be performed are:

[0077] a. PID speed regulation: Dynamically adjust the fan speed (n) through the proportional-integral-derivative algorithm;

[0078] b. Activation of the pulse cleaning system 6: Start the pulse cleaning system 6, and shorten the cleaning interval to 5 - 8 seconds / time;

[0079] Under the steady-state working condition (0.8<K<1.2), the actions to be performed are:

[0080] a. Maintain the current speed of the variable-frequency centrifugal fan 16 and prohibit speed regulation operations;

[0081] b. Turn off the pulse cleaning system 6 to reduce energy consumption;

[0082] Under inefficient operating conditions (K≤0.8), the following actions are performed:

[0083] a. Reduced frequency operation: Reduce the speed of centrifugal fan 16 to 70% of the baseline value;

[0084] b. Shutdown of auxiliary equipment: Completely shut down the pulse cleaning system 6 and the auxiliary air supply device.

[0085] The formula for calculating the evaluation coefficient is as follows:

[0086]

[0087] In the formula, Dust concentration, For material flow rate, The baseline dust concentration (set value) is used. Rated material flow rate (equipment design value). This is the traffic impact factor (empirical coefficient).

[0088] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A primary separation equipment for recycled asphalt pavement materials, characterized in that, It includes a recycling device, a dust removal device, a flexible dispersion device, a primary screening device, a first-stage crusher and a second-stage crusher, a deasphalting film device and a fine screening device; The dust removal device is a pulse dust collector, including an intermediate housing (1), a discharge hopper (2) and a top cover (3). The intermediate housing (1) is fixed on a support (17), the discharge hopper (2) is fixed at the bottom of the intermediate housing (1), the top cover (3) is fixed on the top of the intermediate housing (1). An air inlet (8) is provided on the side of the discharge hopper (2), a dust discharge system (9) is arranged at the bottom of the discharge hopper (2), an exhaust pipe (10) is provided on the side of the top cover (3), a centrifugal fan (16) is connected to the outlet of the exhaust pipe (10), and the centrifugal fan (16) is fixed on the side of the intermediate housing (1) through a fixing seat (15). A porous plate (4) for partitioning the intermediate housing (1) is fixed inside the top cover (3). Filter bag frames (5) are respectively fixed below the multiple round holes on the porous plate (4). A pulse cleaning system (6) is arranged on the top cover (3). Multiple air outlet pipes (7) of the pulse cleaning system (6) are arranged inside the top cover (3), and multiple air nozzles (11) on the air outlet pipes (7) are respectively aligned with the corresponding round holes below; It also includes a dust concentration acquisition module (18), a control module (19), and a material flow acquisition module. The control module (19) is fixed on the top cover (3), the dust concentration acquisition module (18) is fixed inside the discharge hopper (2), and the material flow acquisition module is installed on the external conveyor belt. The material flow acquisition module is used to detect the amount of raw material processed by the conveyor belt per unit time. The dust concentration acquisition module (18) is used to monitor the concentration of suspended particulate matter in the airflow in real time. The control module (19) receives the data collected by the material flow acquisition module and the dust concentration acquisition module (18) and generates evaluation coefficients. C represents the dust concentration. As a baseline dust concentration, For rated material flow rate, The K value is used as a traffic impact factor, and graded control is implemented based on the K value: When K≥1.2: Dynamically adjust the fan speed through the proportional-integral-differential algorithm, start the pulse cleaning system (6), and shorten the cleaning interval to 5 - 8 seconds / time; When 0.8<K<1.2: Maintain the current speed of the variable-frequency centrifugal fan (16), and prohibit speed adjustment operations; Turn off the pulse cleaning system (6) to reduce energy consumption; When K≤0.8: Reduce the speed of the centrifugal fan (16) to 70% of the reference value; Completely turn off the pulse cleaning system (6) and the auxiliary air supply device.

2. The asphalt pavement recycled material virgin separation equipment according to claim 1, characterized in that, The recycling device is used for milling or mechanical excavation of old asphalt pavements; The dust removal device is used to remove dust and impurities from old asphalt mixtures; The flexible dispersion device is used to preliminarily disperse old asphalt mixtures; The primary screening device is used to separate out 1 kind of fine aggregate; The first-stage crusher and the second-stage crusher are used for multi-stage crushing of materials; The deasphalting film device is used to strip the asphalt film on the surface of aggregates; The fine screening device is used to separate out 4 - 5 kinds of coarse and fine aggregates with different particle sizes.

3. The asphalt pavement recycled material virgin separation equipment according to claim 1, characterized in that, The dust discharge system (9) includes a dust discharge cover (12) fixedly connected to the bottom outlet of the discharge hopper (2). A wind wheel (13) is installed inside the dust discharge cover (12). One end of the dust discharge cover (12) is fixed with a motor (14), and the output shaft of the motor (14) is fixedly connected to the end of the wind wheel (13).

4. A process for the virgin separation of recycled asphalt pavement material, employing the virgin separation equipment for recycled asphalt pavement material as described in any one of claims 1-3, and dynamically adjusting the fan speed, pulse cleaning system (6), and auxiliary air supply device according to the evaluation coefficient K value generated by the control module (19), characterized in that, It includes the following steps: Step 1, Recycling old asphalt mixture: Recycle the old asphalt pavement by milling or mechanical excavation to obtain old asphalt mixture; Step 2, Dust removal: Perform dust removal treatment on the recycled old asphalt mixture to remove surface dust and impurities; Step 3, Flexible dispersion: Preliminarily disperse the old asphalt mixture by flexible dispersion to avoid excessive crushing; Step 4, Primary screening: Perform primary screening on the dispersed material to separate out 1 kind of fine aggregate; Step 5, First-stage crushing: Perform first-stage crushing on the coarse material after primary screening to reduce its particle size; Step Six, Secondary Crushing: The material after primary crushing is subjected to secondary crushing to further reduce the particle size; Step 7: Deasphalting the asphalt membrane: The asphalt membrane is desorbed by a combination of microwave radiation and mechanical stripping. The microwave frequency is 2.45 GHz and the power density is 0.6-1.0 W / g. The asphalt membrane is directionally heated to the softening point, and then stripped by high-speed airflow impact. Step 8, Fine Screening: Integrating hyperspectral imaging and AI recognition algorithms, the residual asphalt content on the aggregate surface is detected in real time. Unqualified particles are precisely removed by pneumatic nozzles to obtain 4-5 different sizes of coarse and fine aggregates. The hyperspectral imaging wavelength range is 400-2500nm, and the AI ​​recognition algorithm adopts the DCNN model. Step 9: Perform interface activation and regeneration treatment on the finely screened aggregate using a 0.3-0.5% concentration of silane-epoxy resin composite modifier.

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