Asphalt milling material oil and stone separation device and regeneration method

Abstract

The application discloses a kind of asphalt milling material oil stone separation equipment and its regeneration method, equipment includes raw material conveying belt, cone crushing device with rubber layer, hair roller cleaning machine, multi-point ultrasonic separation pool, solvent recovery pool, secondary cleaning machine and screening machine connected in sequence.Core lies in: the rubber layer of crushing device inner wall buffering rigid collision when crushing, protect stone corner;Ultrasonic separation pool is layered by multilayer steel mesh, cooperate bottom and interlayer multi-point layout ultrasonic wave transmitter and vibrator, at 120 DEG C temperature, using cavitation effect and organic solvent cooperation, high-efficiency stripping asphalt film;Solvent recovery pool realizes distillation recovery and cyclic use of solvent by cooling condenser.This application solves the problem of incomplete separation, damage stone, high energy consumption and heavy pollution of traditional method, the corner of stone after processing is intact, solvent consumption is reduced by 40-60%, realizes the high-quality, green regeneration of waste asphalt mixture.

Description

Technical Field

[0001] This invention relates to the field of asphalt milling material oil-stone separation technology, and particularly to an asphalt milling material oil-stone separation device and regeneration method. Background Technology

[0002] With the continuous development of road transportation infrastructure, the scale of asphalt pavement construction and maintenance is expanding, resulting in a large amount of waste asphalt milling material. Waste asphalt milling material contains a certain proportion of old asphalt and mineral aggregates. If it can be scientifically and efficiently separated and reused, it can not only save resources and reduce production costs, but also effectively reduce environmental pollution from waste. Therefore, the research and development of waste asphalt material recycling technology and related equipment has become an important research direction in the field of highway engineering.

[0003] Currently, traditional methods for treating waste asphalt milling aggregate mainly rely on simple physical screening and heat recycling. These methods suffer from incomplete separation, resource waste, and high energy consumption. Particularly in the asphalt-aggregate separation stage, because the old asphalt is tightly adhered to the aggregate surface, efficient separation cannot be achieved using only mechanical or thermal treatment methods, resulting in poor quality recycled aggregate and limited reuse performance. Furthermore, the processing may generate harmful waste gases and residues, adversely affecting the environment.

[0004] To address these issues, it is particularly important to develop an asphalt milling material oil-stone separation device and its supporting recycling method.

[0005] Patent CN109024161A discloses a high-quality asphalt milling aggregate recycling system and method, including a raw material supply device, a conveying device, a vertical shaft impact crusher, a vibrating feeder, an air screening system, a recycling filter, a negative pressure dust collection and recycling mechanism, and a storage device. The core of this patent is to achieve the separation of asphalt and aggregate through mechanical impact. However, mechanical impact can affect the sharp edges of the aggregate, thus impacting the durability of the asphalt pavement. Simultaneously, the patent proposes using ultrasound to assist in the separation of old asphalt and aggregate, but the lack of an effective medium during ultrasonic vibration makes it difficult to achieve efficient separation of old asphalt and aggregate.

[0006] Patent CN112275774B discloses an asphalt milling material mixing, stripping, and screening device and its working method. The device includes a box body, a shot blasting mechanism at the top, and spiral blades at the bottom. The spiral blades are connected to a drive mechanism, which drives the spiral blades to rotate. A screen is located below the spiral blades, and an inclined discharge plate is located below the screen. The box body has a discharge port, which guides the falling milling material to the discharge port, allowing the milling material to flow out of the box body. The box body also has a feed port for adding milling material. The main principle of this patent is the collision between milling materials to remove the asphalt film. However, it also faces the problem of damaging the edges and corners of the aggregate.

[0007] Patent CN110917941A discloses a device and method for separating asphalt mixtures from aggregates using bio-oil as a solvent. The device includes: a bio-oil supply mechanism, a waste asphalt mixture conveyor belt, an oil-aggregate separator, an oil-aggregate filter, a conveyor belt for the separated aggregates, and an aggregate sorting and screening mechanism. This patent utilizes the similarity in chemical composition and molecular structure between bio-oil and petroleum asphalt, separating the asphalt from the aggregates through stirring and dissolving the asphalt. However, the stirring and dissolving process damages the sharp edges of the aggregates. Furthermore, the high asphaltene content in the asphalt, a highly cross-linked and high-molecular-weight polar compound, limits the solubility of low-molecular-weight polar components in the bio-oil (such as phenols and acids).

[0008] Therefore, there is an urgent need to develop a set of efficient asphalt milling material oil-stone separation equipment and its regeneration method, which can not only meet the needs of resource utilization, but also promote green and low-carbon development, and has significant economic, social and environmental benefits. Summary of the Invention

[0009] The purpose of this invention is to provide an asphalt milling material oil-stone separation device and regeneration method, which solves the problem of how to achieve efficient separation of asphalt and stone while avoiding damage to the edges of aggregates, reducing energy consumption and environmental pollution, and realizing the recycling of organic solvents.

[0010] This invention is implemented as follows: This invention provides an asphalt milling material oil-aggregate separation device, characterized by comprising, in sequence: a mixture conveyor belt; a cone crusher for crushing asphalt milling material to a predetermined particle size, comprising a fixed cone cavity, a moving cone assembly, and an eccentric drive mechanism, wherein the inner wall of the fixed cone cavity is provided with a rubber layer; a crushed mixture conveyor belt; a bristle roller cleaner for cleaning dust and debris from the surface of the crushed mixture, comprising bristle rollers, a high-pressure spray device, and a motor; a cleaned mixture conveyor belt; and a multi-point ultrasonic asphalt mixture oil-aggregate separation tank for separating asphalt from aggregates in an organic solvent through ultrasonic cavitation, comprising a separation tank, a multi-layer steel mesh, and a first ultrasonic transmitter. The system includes: a first ultrasonic transducer, a first heating device, a vibrator, and a magnetic rotary discharge gate; a waste asphalt recycling and organic solvent recovery tank, used to heat and ultrasonically treat the organic solvents dissolved in asphalt to achieve asphalt recycling and organic solvent recovery for reuse, including a separation tank, a second ultrasonic transmitter, a second heating device, a cooling condenser, and an organic reagent storage tank; a conveyor belt for the separated mixture; a second-stage brush roller cleaner, used to clean the surface of the separated stone to remove residual organic solvents and incompletely removed asphalt; a conveyor belt for the cleaned and separated mixture; and a RAP stone screening machine, used to classify and screen the cleaned stone according to particle size, including a vibrating screen, multi-layer screening discs, and a screening sealing cover.

[0011] The core improvement of the crushing device lies in the rubber layer on the inner wall of the fixed cone cavity. When the moving cone assembly squeezes the stone, the elastic deformation of the rubber layer absorbs and buffers the enormous extrusion and impact forces. This transforms the crushing process from "rigid collision" to "flexible extrusion." The encapsulating effect of the rubber layer disperses large pieces of milled material instead of crushing their edges; while achieving initial material dispersion and particle size control, it protects the original edges of the stone, avoids the generation of micro-cracks, and lays the foundation for the subsequent production of high-quality recycled aggregate.

[0012] An ultrasonic transmitter generates ultrasonic waves, inducing cavitation in the liquid. The microjets and shock waves released when bubbles collapse directly act on the asphalt-aggregate interface, a "directional impact" that simple solvent dissolution or mechanical stirring cannot achieve. A vibrator continuously tumbles the aggregate within the separation tank, ensuring that all surfaces of the aggregate are evenly exposed to the ultrasonic field and solvent, increasing the effective area for ultrasonic action. Multiple layers of steel mesh separate the aggregate into layers, preventing excessively thick aggregate buildup that would prevent lower layers from effectively contacting the ultrasonic energy, ensuring consistent treatment results for all aggregates. Through the synergistic effect of "ultrasonic cavitation + solvent dissolution + vibration tumbling + layered distribution," efficient and thorough asphalt film removal is achieved.

[0013] The first heating device in the separation tank only needs to heat the solvent to 120°C, which is far lower than the high temperature of over 160°C required for traditional thermal regeneration. Ultrasonic cavitation operates efficiently at relatively low temperatures, significantly reducing energy consumption. Due to the low processing temperature, the asphalt does not produce large amounts of harmful volatile gases due to high temperatures, achieving clean production. The separated solvent enters the waste asphalt regeneration and organic solvent recovery tank for regeneration, instead of being directly discharged. The second-stage brush roller washing machine thoroughly washes away any trace amounts of solvent and asphalt that may remain on the stone surface with clean water, ensuring that the final recycled aggregate is clean and avoiding secondary pollution to the environment caused by residual solvents.

[0014] The separation tank and secondary heating device receive the asphalt-rich solvent mixture discharged from the separation pool. Heating evaporates the solvent, separating it from the dissolved asphalt. Simultaneously, ultrasonic assistance allows the solvent and aged asphalt to fuse, achieving initial asphalt regeneration. A cooling condenser condenses the evaporated solvent gas back into a liquid state. The recovered liquid solvent in the organic reagent storage tank is stored and pumped back into the separation pool via the inlet valve for reuse in the next processing. This forms a closed-loop solvent recycling system. This reduces solvent consumption by 40-60%, significantly lowering operating costs and environmental risks, and perfectly solving the problem of solvent recovery and recycling.

[0015] Through multi-level collaborative processing, the entire process from crushing, washing, ultrasonic separation, solvent recovery to fine screening is automated, avoiding human error and significantly improving operational safety and production efficiency.

[0016] A further technical solution of the present invention is as follows: the fixed cone cavity is fixed to the frame and forms the outer wall of the crushing chamber; the moving cone assembly is embedded in the fixed cone cavity and together with the fixed cone cavity forms the crushing chamber; the eccentric drive mechanism is connected to the bottom of the moving cone assembly for driving the moving cone assembly to perform periodic oscillating motion, so that the gap between the moving cone and the fixed cone alternately expands and contracts, thereby applying extrusion and shearing forces to the material; the rubber layer is provided on the inner wall of the fixed cone cavity and is used to buffer the rigid collision between the stone and the cavity during the crushing process, reducing damage to the stone's edges.

[0017] The elastic deformation of the rubber layer buffers and encapsulates the aggregate, preventing micro-cracks from rigidly colliding with the metal cavity. This helps to form more regular crushed particles, maintains the angularity and crushing value of the aggregate, and can be directly used in high-grade asphalt mixtures.

[0018] A further technical solution of the present invention is as follows: In the multi-point ultrasonic asphalt mixture oil-stone separation tank: the separation tank is a box structure, the bottom of which is connected to the liquid outlet chamber, the liquid outlet chamber is connected to the liquid outlet valve, and a hole connected to the first ultrasonic transmitter and the liquid outlet valve is placed at the bottom of the separation tank and isolated from the liquid outlet chamber; three layers of rotatable steel mesh are provided on one side of the separation tank, which are controlled by a telescopic mechanical rod to be lowered in sequence; the first ultrasonic transmitter is distributed at the bottom of the separation tank and in the interval between each layer of steel mesh; the first heating device is arranged in an S-shape on both sides of the separation tank; the vibrator is located on the outer side wall of the separation tank and below the steel mesh; a magnetic rotating discharge door is provided on one side of the separation tank for discharging material after ultrasonic treatment.

[0019] Layered material distribution ensures uniform stone load on each layer of steel mesh, guaranteeing consistent ultrasonic treatment results; multi-point ultrasonic transmitters create a three-dimensional ultrasonic field, allowing cavitation to occur on all surfaces of the stone; vibrators cause the stone to tumble continuously during ultrasonic treatment, increasing the ultrasonic contact area; and an S-shaped heating device ensures stable temperature within the tank, allowing the organic solvent to achieve optimal dissolving activity.

[0020] A further technical solution of the present invention is: the first ultrasonic transmitter is arranged in a grid pattern at the bottom of the separation tank, with a total of 9 transmitters and a diameter of 4cm; 3 transmitters with a diameter of 2cm are set in the interval of each layer of steel mesh to ensure uniform distribution of the ultrasonic field.

[0021] The three-dimensional arrangement at the bottom and between layers ensures that ultrasonic energy is evenly distributed within the separation tank, avoiding dead corners and ensuring that all stone surfaces receive sufficient cavitation impact, thus significantly improving the peeling efficiency.

[0022] A further technical solution of the present invention is: in the waste asphalt recycling and organic solvent recovery tank: the separation tank is connected to the liquid outlet valve of the separation tank through a pipeline; the cooling condenser is located above the separation tank and is connected to the separation tank and the organic reagent storage tank to realize the recovery and recycling of organic solvents.

[0023] The organic solvent is fully mixed with the aged asphalt by heating and ultrasonic assistance, and the oil in the asphalt is replenished to achieve regeneration. The distilled organic solvent is recovered to the storage tank through a cooling condenser for recycling. The comprehensive utilization rate of the solvent is greatly improved, the operating cost is reduced, and the discharge of waste liquid is avoided.

[0024] This invention also provides a regeneration method for separating asphalt milling aggregate from aggregate, comprising the following steps: S1: crushing the asphalt milling aggregate using a cone crusher to control the particle size; S2: washing the crushed material with a brush roller cleaner to remove surface dust and impurities; S3: conveying the washed material to a multi-point ultrasonic asphalt mixture asphalt-aggregate separation tank and adding organic solvent; S4: layering the material through a multi-layer steel mesh, activating a heating device to heat to 120°C and maintaining the temperature for 1 hour; S5: activating an ultrasonic transmitter and vibrator to perform ultrasonic treatment for 1.5 hours to achieve separation of asphalt and aggregate; S6: after ultrasonic treatment, discharging the organic solvent containing dissolved asphalt into a waste asphalt regeneration and organic solvent recovery tank for regeneration and recovery; S7: opening a magnetic rotary discharge gate, using a vibrator to shake off the clean aggregate, and conveying it to a second-stage brush roller cleaner for deep cleaning; S8: collecting the cleaned aggregate by a screening machine for grading.

[0025] By leveraging the synergistic effect of ultrasonic cavitation and organic solvent dissolution, asphalt and aggregate are separated efficiently. The asphalt residue on the aggregate surface after treatment is ≤0.5%, compared to ≥2% for traditional solvent methods. The treatment time is shortened to 2.5 hours, resulting in higher treatment efficiency compared to traditional solvent soaking or mechanical stirring separation methods.

[0026] A further technical solution of the present invention is: in step S5, the ultrasonic power is set to 1.5kW, and the ultrasonic waves generate micro-jets and shock waves through cavitation effect, which act on the interface between asphalt and stone to achieve efficient stripping.

[0027] Ultrasonic waves generate high-frequency pressure changes in liquid media, forming tiny bubbles that collapse violently, releasing powerful shock waves and microjets that directly act on the asphalt-aggregate interface, weakening or breaking the adhesion between the two, while accelerating the penetration of solvent molecules, thus greatly improving the interface peeling efficiency.

[0028] A further technical solution of the present invention is: after the organic solvent is regenerated by heating and ultrasound in step S6, it is recycled and reused through a cooling condenser, thereby improving the comprehensive utilization rate of the solvent.

[0029] Organic solvent recovery systems reduce solvent consumption by 40-60%, significantly lower operating costs through recycling, and avoid secondary pollution caused by solvent emissions, thus achieving green and environmentally friendly practices.

[0030] A further technical solution of the present invention is: in step S4, the quality of the stone on each layer of steel mesh is controlled by layered material distribution to ensure that the ultrasonic treatment effect is consistent; in step S5, the vibrator causes the stone on the steel mesh to roll, thereby increasing the range of ultrasonic action on the stone.

[0031] By laying down three layers of steel mesh from bottom to top, the load on each layer is ensured to be uniform, avoiding ultrasonic energy attenuation due to excessive material layer thickness, ensuring that all stones can receive sufficient cavitation treatment, and improving the consistency of the overall separation effect.

[0032] A further technical solution of the present invention is: in step S7, the second-stage brush roller cleaning machine uses warm water high-pressure spraying to remove residual organic solvents and incompletely removed asphalt, ensuring the cleanliness of the recycled aggregate.

[0033] The U-shaped rotating brush rollers work together with the high-pressure spraying of warm water to thoroughly remove residual organic solvents and trace amounts of asphalt from the surface of the aggregate, ensuring the cleanliness and appearance quality of the recycled aggregate, which can be directly used in high-grade asphalt mixtures.

[0034] The beneficial effects of this invention are as follows: 1. This invention improves the interface stripping efficiency by directly impacting the asphalt-aggregate interface with a micro-jet generated by ultrasound. The high-frequency vibration of ultrasound increases the penetration rate of solvent molecules and shortens the dissolution time of long-chain hydrocarbons in aged asphalt. Experiments show that after 2.5 hours of treatment, 1 hour of soaking at 120 degrees Celsius, and 1.5 hours of ultrasonic treatment, the asphalt residue on the aggregate surface is ≤0.5%. Compared with traditional solvent methods, which usually require a long soaking or stirring time, and some processes can take more than 3 hours, resulting in low separation efficiency, this invention greatly improves efficiency. Specifically, a multi-point ultrasonic asphalt mixture oil-stone separation tank is adopted. The first ultrasonic transmitter is placed at the bottom of the separation tank and in the interval of each layer of steel mesh to form a three-dimensional ultrasonic field. The vibrator is started simultaneously to make the stone continuously roll during the ultrasonic process, increasing the ultrasonic contact area. The stone is distributed in layers of three steel mesh to avoid stone accumulation and blockage, ensuring that each layer of stone can fully receive the ultrasonic cavitation effect. The ultrasonic power is set to 1.5kW and the processing time is 1.5 hours, so that the ultrasonic waves generate high-frequency pressure changes in the liquid medium, forming cavitation bubbles and collapsing to release shock waves.

[0035] 2. This invention reduces solvent usage by 40-60% through the synergistic effect of composite solvents and ultrasound; it also eliminates high-temperature pollution: the lower ultrasonic treatment temperature avoids harmful gases generated by thermal methods. Specifically, it employs the synergistic effect of ultrasonic cavitation and organic solvent dissolution, accelerating solvent penetration and asphalt stripping through physical cavitation effects, reducing dependence on solvent usage; S-shaped first heating devices are installed on both sides of the separation tank, with the heating temperature controlled at 120℃ to prevent the high-temperature volatilization of asphalt from generating harmful gases; a waste asphalt regeneration and organic solvent recovery tank is set up, and the evaporated organic solvent is condensed and recovered to the organic reagent storage tank through a cooling condenser, realizing solvent recycling and reducing emissions.

[0036] 3. Compared with traditional methods, the present invention reduces energy consumption in removing asphalt from the surface of milled aggregates, and the cleaned aggregates have low angularity and low crushing value loss rate, allowing them to be directly used in high-grade asphalt mixtures, thus increasing added value. The organic solvent recovery system improves the comprehensive utilization rate of solvents and enhances overall economic efficiency. Specifically, it uses low-temperature heating combined with ultrasonic cavitation, eliminating the need for high-temperature melting of asphalt and reducing the processing temperature by more than 25%; specifically, it protects the edges and corners: the inner wall of the fixed cone cavity of the cone crusher is equipped with a rubber layer, which buffers rigid collisions through elastic deformation, avoiding damage to the edges and corners of the aggregates; at the same time, ultrasonic peeling is a non-contact action, avoiding surface micro-cracks caused by mechanical methods; solvent recovery: the cooling condenser in the waste asphalt recycling and organic solvent recovery tank condenses and recovers the evaporated solvent to the organic reagent storage tank, realizing solvent recycling and reducing solvent consumption by 40-60%; increasing added value: the cleaned aggregates have intact angularity and low crushing value loss rate, allowing them to be directly used in high-grade asphalt mixtures.

[0037] 4. This invention replaces repetitive manual labor with a precise and continuous intelligent operation mode, reducing reliance on manpower while ensuring high-quality output. The equipment's built-in intelligent control system can autonomously complete complex processes, avoiding human error and significantly improving operational safety. Specifically, the equipment uses sequentially connected conveyor devices to achieve automatic material flow between processes; the telescopic mechanical rod in the separation tank controls the three layers of steel mesh to be lowered sequentially from bottom to top, achieving automatic layered material distribution; after ultrasonic treatment, the magnetic rotary discharge gate opens, and the vibrator shakes the stones off for discharge; each process can be centrally controlled via operating knobs or the control system, reducing manual intervention.

[0038] 5. In this invention, ultrasonic waves are selectively applied to the asphalt film to reduce surface damage to the aggregate and avoid microcracks caused by mechanical methods. Attached Figure Description

[0039] Figure 1 This is a partial structural schematic diagram of an asphalt milling material oil-stone separation device provided by the present invention;

[0040] Figure 2 This is another structural schematic diagram of an asphalt milling material oilstone separation device provided by the present invention;

[0041] Figure 3 This is a diagram showing the working status changes of the multi-point ultrasonic asphalt mixture oil-stone separation tank provided by the present invention;

[0042] Figure 4 This is a schematic diagram of the structure of the cone crusher for crushing stone provided by the present invention;

[0043] Figure 5 This is a schematic diagram of the structure of the brush roller cleaning machine provided by the present invention;

[0044] Figure 6 This is a schematic diagram of the structure of the multi-point ultrasonic asphalt mixture oil-stone separation tank and the waste asphalt regeneration and organic solvent recovery tank provided by the present invention.

[0045] Figure 7 This is a schematic diagram of the structure of the second-stage brush roller cleaning machine provided by the present invention;

[0046] Figure 8 This is a schematic diagram of the structure of the RAP stone screening machine provided by the present invention;

[0047] Figure 9 This is the pre-ultrasound adhesion diagram of the stone asphalt provided by the present invention;

[0048] Figure 10 This is an image of the asphalt adhesion on the stone after ultrasonic treatment, provided by the present invention.

[0049] Reference numerals: 101. Mixed material conveyor belt; 102. Rubber layer; 103. Fixed cone cavity; 104. Moving cone assembly; 105. Eccentric drive mechanism; 201. Crushed mixed material conveyor belt; 202. High-pressure spray device; 203. Brush roller; 204. Motor; 301. Washed mixed material conveyor belt; 302. Operating knob; 303. Steel mesh; 304. Telescopic mechanical rod; 305. First ultrasonic transducer; 306. First ultrasonic transmitter; 307. Separation tank; 308. 309. Vibrator; 310. Discharge valve; 311. Inlet valve; 312. Magnetic rotary discharge gate; 313. First heating device; 404. Separation tank; 405. Second ultrasonic transducer; 406. Second ultrasonic transmitter; 407. Second heating device; 408. Cooling condenser; 409. Organic reagent storage tank; 5001. Separated mixture conveyor belt; 501. Washed and separated mixture conveyor belt; 502. Vibrating screen; 503. Screening disc; 504. Screening sealing cover. Detailed Implementation

[0050] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0051] Example 1:

[0052] like Figure 1-10The asphalt mixture oil-stone separation device shown is mainly based on ultrasonic cavitation and includes: "mixture conveyor belt 101" + "cone stone crusher" + "crushed mixture conveyor belt 201" + "brush roller 203 cleaning machine" + "cleaned mixture conveyor belt 301" + "multi-point ultrasonic asphalt mixture oil-stone separation tank" + "waste asphalt recycling and organic solvent recovery tank" + separated mixture conveyor belt 501 + "RAP stone cleaning" + "cleaned separated mixture conveyor belt 502" + "RAP stone screening machine".

[0053] The cone crusher consists of a rubber layer 102, a fixed cone cavity 103, a moving cone assembly 104, and an eccentric drive mechanism 105. The fixed cone cavity 103 is fixed to the frame and forms the outer wall of the crushing chamber. The moving cone assembly 104 is embedded in the fixed cone cavity 103, forming the crushing chamber together with the fixed cone. A rubber layer 102 is added to the inner wall of the fixed cone cavity 103 to prevent the stone from colliding with the cavity and causing damage. The eccentric drive mechanism 105 is connected to the bottom of the moving cone and provides oscillating force. During operation, the material enters the crushing chamber via the mixing conveyor belt 101; the eccentric drive mechanism 105 drives the moving cone to oscillate periodically, causing the gap between the moving cone and the fixed cone to alternately expand and contract, applying compression and shearing force to crush the material; the material falls along the gap gradient and is discharged through the discharge port, completing the grading and fine crushing.

[0054] The brush roller cleaning machine consists of a brush roller 203, a high-pressure spray device 202, and a motor 204, forming a rectangular prism. The brush roller 203 is arranged in a U-shape inside the device, and the spray device is located on top.

[0055] The multi-point ultrasonic asphalt mixture oil-stone separation tank consists of an operating knob 302, a steel mesh 303, a telescopic mechanical rod 304, a first ultrasonic transducer 305, a first ultrasonic transmitter 306, a separation tank 307, a vibrator 308, an outlet valve 309, an inlet valve 310, a magnetic rotary discharge gate 311, and a first heating device 312. The total length of the separation tank is 32cm, the height of the spiral rod when it is raised is 66cm, and the height when it is in contact with the separation tank 307 is 48cm.

[0056] Furthermore, the separation tank 307 is a box with a diameter of 22cm×22cm×27cm, and a small hole with a diameter of 3cm is provided at the bottom so that the separation tank 307 can communicate with the first ultrasonic transmitter 306 and the liquid outlet valve 309 of the separation pool. The separation tank 307 is located on the right side of the separation pool, and is 4cm and 2cm away from the surrounding area respectively.

[0057] Furthermore, a three-layer fine-aperture steel mesh 303 is provided on one side of the separation tank 307. The steel mesh 303 is supported by an annular mechanical rod. When ultrasonic treatment is not performed, the three layers of steel mesh 303 are in a vertical state. The bottom layer of steel mesh 303 is 17cm away from the bottom of the separation tank 307, and each layer of steel mesh 303 is 3cm apart.

[0058] Furthermore, when work begins, the bottom layer of steel mesh 303 is placed down before the stones are introduced. The remaining two layers are placed down in sequence after enough stones have been placed in the bottom layer, so that the stones on each layer of steel mesh 303 are as similar as possible.

[0059] Furthermore, the first ultrasonic transmitter 306 is located below the separation tank 307 and in the intervals of each layer of steel mesh 303. It is arranged in a mesh pattern at the bottom, with a total of 9 transmitters. Each transmitter head has a diameter of 4cm, and each transmitter is spaced 2cm apart. It is arranged horizontally on the side, with 3 transmitters in the intervals of each layer of steel mesh 303, for a total of three layers. Each transmitter head has a diameter of 2cm, and each transmitter is spaced 2cm apart.

[0060] Furthermore, mechanical rods are installed around the separation tank 307 to connect with the upper ultrasonic transmitting device, and the ultrasonic transmitter in the upper ultrasonic transmitting device is arranged in the same position as the ultrasonic transmitter at the bottom of the separation tank 307.

[0061] Furthermore, the first heating device 312 is arranged in an S-shape on the left and right sides of the separation tank 307.

[0062] Furthermore, a door that can be flipped up and down is installed on the lower right side of the separation tank 307. The upper part of the door is magnetic, ensuring that the inside of the tank is sealed during ultrasonic separation. After the stone is separated, the door is manually flipped clockwise, and the lower part of the door comes into contact with the tilted steel mesh 303 to form a discharge port.

[0063] Furthermore, the vibrator 308 is located below the ultrasonic transmitter in the interval of the steel mesh 303. It is activated when the equipment ultrasonically separates the stone, causing the stone to vibrate and roll during ultrasonic treatment, increasing the ultrasonic contact area. At the same time, when the stone is discharged, it vibrates, causing the stone in the steel mesh 303 to fall into the separated mixed material conveyor belt 501.

[0064] Furthermore, the multi-point ultrasonic asphalt mixture oil-stone separation tank is equipped with an operation knob 302 on the front.

[0065] Furthermore, the liquid outlet valve 309 of the separation tank is located 13cm below the separation tank 307 and is connected to the waste asphalt recycling and organic solvent recovery tank via a hose. The liquid inlet valve 310 on the side of the separation tank is connected to the organic reagent storage tank 406.

[0066] The waste asphalt recycling and organic solvent recovery tank consists of a separation tank 401, a second ultrasonic transmitter 403, a second ultrasonic transducer 402, a second heating device 404, a cooling condenser 405, and an organic reagent storage tank 406.

[0067] Furthermore, the separator 401 is connected to the bottom of the multi-point ultrasonic asphalt mixture oilstone separator via a detachable pipe.

[0068] Furthermore, the cooling re-condenser 405 is located above the ultrasonic asphalt mixture oil-stone separation tank, and the cooling re-condenser 405 is connected to the separation tank 401 through a detachable pipe.

[0069] The further cooling condenser 405 is connected to the separation tank through a pipeline. When started, the organic reagent in the organic reagent storage tank 406 is pumped into the separation tank by a pump to achieve recycling.

[0070] The RAP stone screening machine consists of a vibrating screen 503, a screening disc 504, and a screening sealing cover 505. The screening disc 504 is fixed to the vibrating screen 503 by three springs. The screening disc 504 has a total of 8 layers, and the screening apertures are from large to small as follows: 9.5, 4.75, 2.36, 1.18, 0.6, 0.3, 0.15, and 0.075. The excitation force of the vibrating screen 503 is 20kN.

[0071] The conveying device includes a mixed material conveyor belt 101, a crushed mixed material conveyor belt 201, a washed mixed material conveyor belt 301, a separated mixed material conveyor belt 501, and a washed and separated mixed material conveyor belt 502.

[0072] One end of the mixed material conveyor belt 101 is located at the raw material supply point, and the other end is located above the cone crusher.

[0073] One end of the crushed mixture conveyor belt 201 is located below the cone crusher, and the other end is located above the brush roller 203 cleaning machine;

[0074] After cleaning, one end of the mixed material conveyor belt 301 is located below the brush roller 203 cleaning machine, and the other end is located above the multi-point ultrasonic asphalt mixture oil-stone separation tank.

[0075] After separation, one end of the conveyor belt 501 is located below the multi-point ultrasonic asphalt mixture oil-stone separation tank, and the other end is located above the brush roller 203 cleaning machine.

[0076] After cleaning, the separation conveyor belt 502 is located at one end below the brush roller cleaning machine and at the other end above the RAP stone screening machine.

[0077] Example 2:

[0078] The present invention utilizes the regeneration method and steps of the asphalt milling material crushing, screening, and regeneration equipment:

[0079] S1: By adjusting the parameters of the eccentric drive mechanism 105 or adjusting the discharge port setting, the crushing particle size is controlled. The raw material enters the crushing chamber of the cone crusher through the feed port via the mixing conveyor belt 101. The eccentric drive mechanism 105 is activated to drive the axis of the moving cone assembly 104 to perform regular oscillating motion, thereby periodically increasing or decreasing the gap between the moving cone and the fixed cone. The stone to be crushed falls continuously into the crushing chamber from the top feed port. When the stone enters the space between the inner walls of the moving cone and the fixed cone, it is subjected to continuous compression, grinding, and bending action with the oscillating motion of the moving cone, thus being gradually crushed into smaller particle sizes. During this process, the rubber layer 102 on the inner wall not only protects the metal cavity from direct impact, but its elastic deformation also produces a certain buffering and wrapping effect on the stone, which helps to form more regular crushed particles and reduce the excessive generation of powder. After crushing, the material is squeezed to the set size by gravity and the pushing of subsequent materials, and then slides down the gap cavity to the crushed mixing conveyor belt 201.

[0080] S2: The raw material is conveyed from the crushed mixture conveyor belt 201 to the brush roller 203 cleaning machine. The brush rollers 203 are arranged in a U-shape in the material's direction of travel within the box, forming a curved cleaning channel. Upon startup, the motor 204 drives all the brush rollers to rotate synchronously, and then the high-pressure spray device 202 sprays high-pressure hot water into the U-shaped channel area. The asphalt mixture to be treated enters the box under the drive of the mixture conveyor belt 101. It moves forward under the combined action of mechanical brushing by the rotating brush rollers and rinsing by the high-pressure hot water. The mud, dust, and loose asphalt adhering to its surface are effectively stripped off. The rinsed wastewater is discharged from the bottom, and the pre-cleaned material is sent out from the outlet. After cleaning, the stone material falls directly into the cleaned mixture conveyor belt 301.

[0081] S3: Manually open the inlet valve 310 of the separation tank in advance to pump the organic solvent from the organic reagent storage tank 406 into the separation tank 307. When the liquid level of the organic solution is close to the bottom of the inlet valve 310, manually close the inlet valve 310.

[0082] S4: The mixture is conveyed by the cleaned mixture conveyor belt 301 into the multi-point ultrasonic asphalt mixture oil-stone separation tank. According to the conveyor belt speed, the steel mesh 303 in the separation tank is driven by the mechanical rod on the side of the separation tank 307 and lowered sequentially from bottom to top to ensure uniform load on each layer. After the material is laid, the upper mechanical rod is activated to lower the upper ultrasonic device until it is in close contact with the top of the separation tank (307) to form a completely sealed ultrasonic treatment environment.

[0083] S5: Activate the S-shaped first heating devices 312 on both sides of the separation tank 307 to heat the organic solvent system in the tank and maintain a constant temperature of 120℃ for 1 hour. This ensures the solvent reaches its optimal dissolving activity temperature, maximizing its ability to dissolve asphalt and ensuring temperature stability during subsequent ultrasonic treatment.

[0084] S6: Simultaneously activate all first ultrasonic transmitters 306 at the bottom, between layers, and above of the separation tank 307, setting the total power to 1.5kW. Simultaneously activate the vibrator 308 under the interlayer steel mesh. The ultrasonic separation process lasts 1.5 hours. The ultrasonic waves propagate in the liquid medium, generating high-frequency pressure changes, causing the formation of tiny bubbles in the liquid. These bubbles rapidly expand during the negative pressure phase and violently contract and collapse during the positive pressure phase, releasing powerful shock waves and microjets that directly act on the interface between asphalt and aggregate, weakening or breaking the adhesion between them. Simultaneously, the ultrasonic waves cause the organic solvent to wash over the aggregate surface, accelerating the physical peeling of the asphalt layer. At the same time, the vibrator 308 begins to vibrate, causing the aggregate to continuously tumble, increasing the ultrasonic area.

[0085] S7: After the ultrasound is completed, wait for the temperature to stabilize and the organic solvent to cool to a safe discharge temperature. Then, open the bottom outlet valve 309 to allow the mixture rich in dissolved asphalt to flow into the waste asphalt regeneration and organic solvent recovery tank. Close the valve, start the second heating device 404 and the ultrasonic transmitter to mix the organic solvent and asphalt, replenish the oil in the aged asphalt, and regenerate the aged asphalt. After distillation and separation, the waste asphalt dissolved by the organic solvent remains in the separation tank 401 and can be manually removed and stored. At the same time, the excess organic solvent evaporates into gas and passes through the pipeline. It is then cooled into liquid in the cooling condenser 405 and enters the organic reagent storage tank 406. When used next time, open the separation tank inlet valve 310 to pump in the organic solvent, thus achieving recycling.

[0086] S8: Activate the upper mechanical lever to raise the upper ultrasonic device and open the magnetic rotary discharge gate 311, tilting the short side of the gate upwards by 150°. Simultaneously, control each layer of steel mesh to tilt downwards by approximately 30°, with the bottom layer of steel mesh and the magnetic rotary discharge gate forming a smooth discharge channel. Keep the vibrator 308 operating to shake off the clean stone material that has been completely stripped of asphalt from each layer of steel mesh 303. The material is then conveyed through the discharge port to the separated mixture conveyor belt 501 and fed into the second roller washing machine.

[0087] S9: After the washing machine is started, the aggregate undergoes final deep cleaning under the combined action of mechanical brushing by U-shaped rotating brush rollers and high-pressure spraying with warm water. This thoroughly removes residual organic solvents and incompletely removed asphalt from the aggregate surface, ensuring the cleanliness and appearance quality of the recycled aggregate. After cleaning, the aggregate falls directly onto the post-wash separation mixture conveyor belt 502 and enters the RAP aggregate screening machine.

[0088] S10: Recycled aggregate, after deep cleaning by the second-stage brush roller washer, is fed into the RAP stone screening machine via a conveyor. Once all aggregate has entered, the screening sealing cover 505 is closed to ensure no loss of aggregate during vibrating screening. The vibrating screen 503 is then started, and its internal eccentric drive mechanism generates high-frequency, low-amplitude vibrations, driving the screening disc 504 to vibrate continuously. The aggregate is thrown up, dispersed, and moves forward on the screen surface of the screening disc 504. During this process, aggregate particles smaller than the screen aperture pass through the screen and become undersize, while particles larger than the screen aperture continue to move forward as oversize until they are discharged from the outlet. By configuring multiple layers of screens, the aggregate can be precisely graded into various finished products of different particle sizes. After screening, recycled aggregate of different sizes is collected manually, completing the final step of oil-stone separation.

[0089] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An asphalt milling material oil-aggregate separation device, characterized in that, Including those connected sequentially: Mixed material conveyor belt (101); A cone crusher for crushing asphalt milling material to a predetermined particle size includes a fixed cone cavity (103), a moving cone assembly (104), and an eccentric drive mechanism (105). The inner wall of the fixed cone cavity (103) is provided with a rubber layer (102). Conveyor belt for crushed mixed material (201); A brush roller cleaning machine is used to clean dust and debris from the surface of crushed mixtures. It includes a brush roller (203), a high-pressure spray device (202), and a motor (204). Cleaned mixed material conveyor belt (301); A multi-point ultrasonic asphalt mixture oil-stone separation tank is used to separate asphalt from stone in an organic solvent by ultrasonic cavitation. It includes a separation tank (307), a multi-layer steel mesh (303), a first ultrasonic transmitter (306), a first ultrasonic transducer (305), a first heating device (312), a vibrator (308), and a magnetic rotary discharge gate (311). The waste asphalt recycling and organic solvent recovery tank is used to heat and ultrasonically treat the organic solvent containing asphalt to achieve asphalt recycling and organic solvent recovery for recycling. It includes a separation tank (401), a second ultrasonic transducer (402), a second ultrasonic transmitter (403), a second heating device (404), a cooling condenser (405), and an organic reagent storage tank (406). Separated mixture conveyor belt (501); The second-stage brush roller cleaning machine is used to clean the organic solvents and incompletely removed asphalt remaining on the surface of the separated stones. Cleaned and separated mixed material conveyor belt (502); RAP stone screening machine is used to classify and screen cleaned stone according to particle size, including vibrating screen (503), multi-layer screening disc (504) and screening sealing cover (505).

2. The asphalt milling material oil-aggregate separation equipment according to claim 1, characterized in that, The fixed cone cavity (103) is fixed to the frame and forms the outer wall of the crushing chamber; the moving cone assembly (104) is embedded in the fixed cone cavity (103) and surrounds the fixed cone cavity (103) to form the crushing chamber; the eccentric drive mechanism (105) is connected to the bottom of the moving cone assembly (104) for driving the moving cone assembly (104) to perform periodic oscillating motion, so that the gap between the moving cone and the fixed cone alternately expands and shrinks, thereby applying extrusion and shearing force to the material; the rubber layer (102) is provided on the inner wall of the fixed cone cavity (103) for buffering the rigid collision between the stone and the cavity during the crushing process and reducing the damage to the stone's edges.

3. The asphalt milling material oil-aggregate separation equipment according to claim 1, characterized in that, In the multi-point ultrasonic asphalt mixture oil-stone separation tank: The separation tank (307) is a box structure, with its bottom connected to the liquid outlet chamber, which is connected to the liquid outlet valve (309). The first ultrasonic transmitter (306) is placed at the bottom of the separation tank (307) and isolated from the liquid outlet chamber. The separation tank (307) has three layers of rotatable steel mesh (303) on one side, which are lowered in sequence by a telescopic mechanical rod (304); The first ultrasonic transmitter (306) is distributed at the bottom of the separation tank (307) and in the intervals of each layer of steel mesh (303); The first heating device (312) is arranged in an S-shape on both sides of the separation tank (307); The vibrator (308) is located on the outer side wall of the separation tank (307) and below the steel mesh (303); A magnetic rotary discharge gate (311) is located on one side of the separation tank (307) and is used for discharge after ultrasonic treatment.

4. The asphalt milling material oil-aggregate separation equipment according to claim 3, characterized in that, The first ultrasonic transmitter (306) is arranged in a grid pattern at the bottom of the separation tank, with a total of 9 transmitters and a diameter of 4cm; 3 transmitters with a diameter of 2cm are set in the interval of each layer of steel mesh to ensure uniform distribution of the ultrasonic field.

5. The asphalt milling material oil-aggregate separation equipment according to claim 1, characterized in that, In the waste asphalt recycling and organic solvent recovery tank: The separator (401) is connected to the liquid outlet valve (309) of the separator via a pipe; The cooling condenser (405) is located above the separation tank and is connected to the separation tank (401) and the organic reagent storage tank (406) to realize the recovery and recycling of organic solvents.

6. A method for regenerating asphalt milling material by separating asphalt from aggregate using the equipment described in any one of claims 1 to 5, characterized in that... Includes the following steps: S1: The asphalt milled material is crushed using a cone crusher to control the particle size; S2: The crushed material is cleaned by a brush roller cleaning machine to remove surface dust and debris; S3: The cleaned material is transported to a multi-point ultrasonic asphalt mixture oil-stone separation tank, and organic solvent is added; S4: By layering the material through the multi-layer steel mesh (303), start the first heating device (312) to heat to 120°C and keep it at a constant temperature for 1 hour; S5: Start the first ultrasonic transmitter (306) and vibrator (308) to perform ultrasonic treatment for 1.5 hours to achieve the separation of asphalt and stone; S6: After the ultrasound is completed, the organic solvent containing dissolved asphalt is discharged into the waste asphalt regeneration and organic solvent recovery tank for regeneration and recovery. S7: Open the magnetic rotary discharge door (311), and shake the clean stone material off through the vibrator (308) and convey it to the second-stage brush roller cleaning machine for deep cleaning; S8: The cleaned stone is graded and collected by a screening machine.

7. The method according to claim 6, characterized in that, In step S5, the ultrasonic power is set to 1.5kW. The ultrasonic waves generate micro-jets and shock waves through cavitation effect, which act on the interface between asphalt and stone to achieve efficient peeling.

8. The method according to claim 6, characterized in that, In step S6, the organic solvent is regenerated by heating and ultrasound, and then recycled through a cooling condenser (405) for reuse, thus improving the overall utilization rate of the solvent.

9. The method according to claim 6, characterized in that, In step S4, the quality of the stone on each layer of steel mesh (303) is controlled by layered fabric to ensure uniform ultrasonic treatment effect; in step S5, the vibrator (308) causes the stone on the steel mesh (303) to roll, thereby increasing the range of ultrasonic action on the stone.

10. The method according to claim 6, characterized in that, In step S7, the second-stage brush roller cleaning machine uses high-pressure spraying of warm water to remove residual organic solvents and asphalt, ensuring the cleanliness of the recycled aggregate.

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