Preparation device of self-repairing recycled aggregate for highway maintenance in cold region

Abstract

The utility model belongs to the technical field of asphalt preparation devices, and particularly relates to a preparation device of self-repairing recycled aggregate for highway maintenance in a cold region. The device comprises a crusher used for screening asphalt milling materials, and the crusher is sequentially connected with a washing dust removal device, an asphalt milling material rough treatment device, a phase change charcoal spraying device, a third stirring device, an asphalt negative pressure adsorption device and a washing stirring device. The washing stirring device is also connected with a three-shell treatment device for enhancing the adhesiveness of the asphalt milling material; the phase-change material and high-viscosity modifier treatment device is connected with the phase-change biochar spraying device; and the phase-change material and high-viscosity modifier treatment device is connected with the phase-change biochar spraying device. According to the preparation device of the self-repairing recycled aggregate, provided by the utility model, high-efficiency and low-carbon preparation of the self-repairing recycled aggregate is realized, the prepared self-repairing recycled aggregate can effectively repair the problem of cracking of an asphalt pavement caused by large temperature difference, and the service life of the pavement is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of asphalt preparation devices, and in particular relates to a preparation device for self-repairing recycled aggregate for cold region highway maintenance. Background Art

[0002] In cold regions of my country, snow and ice easily accumulate, and the road surface is easily damaged by freezing and thawing. In addition, the temperature difference between day and night is large, and thermal expansion and contraction cause cracks in the road surface. Deicing salt is often used on roads, and the coupling of freezing and thawing cycles and chloride erosion causes the road surface to be eroded, seriously affecting the performance of asphalt pavement. Therefore, timely maintenance of cold-region highways becomes crucial. At present, my country has developed a variety of new materials to add to asphalt composite materials to improve their strength and reduce the impact of freezing and thawing on highways, but it has not fundamentally solved the problem caused by large temperature differences.

[0003] Milling is an important part of road maintenance. According to incomplete statistics, the annual asphalt milling materials in my country have reached more than 20 million tons in recent years. By combining asphalt milling materials with biochar loaded with phase change materials and adding them to asphalt composite materials, the technicians obtained self-repairing recycled aggregates that can not only automatically repair asphalt pavement cracks caused by drastic temperature differences with the help of the thermal energy storage and release mechanism of phase change materials, and improve the density and compressive strength of the mixture, but also reduce the dependence on natural stones in engineering, improve the recycling of resources, and be green and environmentally friendly.

[0004] The preparation of self-healing recycled aggregate requires filling biochar inside the asphalt milling material and loading a certain amount of phase change material. In addition, the obtained asphalt milling material phase change aggregate requires not only high strength and good adhesion between the asphalt milling material and the biochar loaded with the phase change material, but also good interface transition zone characteristics between the asphalt milling material phase change aggregate and the asphalt composite material. The self-healing recycled aggregate prepared by the existing preparation device cannot meet the above characteristics. Therefore, how to design a new preparation device so that the self-healing recycled aggregate prepared by it can meet the above characteristics is a technical problem that needs to be solved urgently.

[0005] In view of this, the present utility model is proposed. Utility Model Content

[0006] The purpose of the utility model is to overcome the shortcomings of the above-mentioned prior art and provide a preparation device for self-repairing recycled aggregate for cold-region highway maintenance. The device uses high-strength asphalt milling material as the skeleton, fills its pores with biochar loaded with phase change material, and makes a three-layer shell material on its surface, so as to realize the efficient and low-carbon preparation of self-repairing recycled aggregate for cold-region highway maintenance.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A preparation device for self-repairing recycled aggregate for cold region highway maintenance, comprising:

[0009] A crusher for screening asphalt milling materials, the crusher is sequentially connected with a water washing and dust removal device, a rough treatment device for asphalt milling materials, a phase change biochar spraying device, a No. 3 stirring device, an asphalt negative pressure adsorption device, and a water washing and stirring device, and the water washing and stirring device is also connected with a three-shell treatment device for enhancing the adhesion of the asphalt milling materials;

[0010] A phase change material and high viscosity modifier treatment device, wherein the phase change material and high viscosity modifier treatment device is connected to a phase change biochar spraying device;

[0011] The phase change biochar spraying device is used to temperature control the phase change biochar and spray it into the asphalt milling material. The function of the phase change biochar spraying device is to spray the powdered biochar loaded with phase change material (phase change biochar) into the asphalt milling material, so that the phase change biochar and the asphalt milling material can be mixed more evenly;

[0012] The function of the third stirring device is to spray the biochar suspension loaded with phase change material into the asphalt milling material to make the two mixed more evenly;

[0013] Specifically, the crusher is preferably a jaw crusher, and also includes a first vibrating screen and a first magnet drum. The first vibrating screen is connected to a water washing and dust removal device through the first magnet drum and a crushing belt conveyor. The jaw crusher functions to effectively crush large-particle asphalt milling materials, with a processing capacity of 15-30t / h and a power of 22kw. The vibrating screen can screen out tiny-particle asphalt milling materials, and the first magnet drum functions to remove iron from the asphalt milling materials.

[0014] Specifically, the water washing and dust removal device includes two high-pressure dust removal nozzles arranged on the top thereof and a second vibrating screen group at the bottom, and the second vibrating screen group is connected to the rough treatment device through a second magnet roller and a dust removal belt conveyor; the second vibrating screen group is equally divided into three sections arranged in parallel with equal intervals of 300 mm, and the horizontal inclination angle of the second vibrating screen group is 10°. High-pressure water washing can ensure that the asphalt milling material has good angularity and ensure the treatment effect during rough treatment; the second vibrating screen group can remove small particles of asphalt milling material below 6 mm, and the second magnet roller is installed at the discharge port of the water washing and dust removal device, and the second magnet roller can remove iron in the asphalt milling material; the dust removal belt conveyor connects the discharge port of the water washing and dust removal device and the feed port of the rough treatment device.

[0015] Specifically, the roughing treatment device includes a roughing treatment box, a roughing treatment working chamber is provided in the roughing treatment box, the asphalt milling material in the dust removal belt conveyor enters the roughing treatment working chamber, the roughing treatment working chamber is also provided with an asphalt drop port that can drop into the asphalt receiving chamber, a high-speed asphalt outlet is provided on the roughing treatment working chamber, the asphalt receiving chamber is connected to the high-speed asphalt outlet, and a high-pressure air inlet is provided on the high-speed asphalt outlet; the roughing treatment working chamber is connected to the phase change biochar spraying device through an asphalt milling material conduit; the asphalt milling material conduit is used to transport the pretreated asphalt milling material;

[0016] The phase-change biochar spraying device comprises a phase-change biochar storage device located at the top and a second belt conveyor located at the bottom;

[0017] The phase change biochar storage device includes a phase change biochar feed port, a recovery phase change biochar feed port, a phase change biochar temperature control device and a phase change biochar nozzle; the asphalt milling material discharge port of the asphalt milling material conduit is arranged near the starting end of the second belt conveyor, so as to facilitate the phase change biochar to be evenly sprayed on the asphalt milling material; the phase change biochar feed port is also connected to a phase change material and a high viscosity modifier processing device.

[0018] Specifically, the phase change material and high viscosity modifier processing device includes a phase change material spraying device, a stirring device No. 1, a high viscosity modifier spraying device, and a stirring device No. 2 which are connected in sequence, and the discharge port of the stirring device No. 2 is connected to the phase change biochar feed port of the phase change biochar spraying device; the discharge port of the phase change biochar spraying device is connected to the stirring device No. 3.

[0019] The phase change material spraying device is used for temperature control and spraying solid-liquid phase change material into the pores of biochar. The principle of the phase change material spraying device is that the phase change material can be converted into liquid at high temperature and can be effectively filled into the interior of biochar by spraying; the high viscosity modifier spraying device is used for adjusting the temperature and spraying high adhesion modifier on the contact surface between the phase change material and the biochar pores. The function of the high viscosity modifier spraying device is to enhance the adhesion between the phase change material and the biochar pore wall, so that the phase change material can be more stably filled into the biochar.

[0020] The phase change material is polyethylene glycol, and the high viscosity modifier is polyvinyl alcohol adhesive (the components and weight ratio of the polyvinyl alcohol adhesive are polyvinyl alcohol powder: water: acetic acid is 3:5:0.5)

[0021] The first stirring device is used to mix the phase change material and the biochar powder; the second stirring device is used to mix the high viscosity modifier and the phase change biochar material; the third stirring device is used to mix the asphalt milling material and the phase change biochar suspension;

[0022] The stirring device No. 1, the stirring device No. 2 and the stirring device No. 3 are all designed to promote the effective filling among the asphalt milling material, the phase change material, the high viscosity modifier and the biochar.

[0023] Specifically, the phase change material spraying device has the same structure as the high-viscosity modifier spraying device. The phase change material spraying device is provided with a material storage box at the top, a first belt conveyor at the bottom, a temperature control device in the material storage box, and a material high-pressure nozzle for spraying the phase change material onto the first belt conveyor; the temperature control range of the temperature control device is 0 to 250°C.

[0024] Specifically, a third belt conveyor is provided at the bottom of the vacuum adsorption box in the asphalt negative pressure adsorption device, and the third belt conveyor is connected to the cooling platform. A water spray pipe is provided above the cooling platform. The function of the asphalt negative pressure adsorption device is to create a negative pressure environment. The phase change biochar can be deeply filled in the asphalt milling material, and then combined with natural cooling and water cooling, the asphalt milling material phase change material is quickly cooled; the vacuum adsorption box is set to a suction rate of 200-250m 3 / h, the degassing cycle is 60s, the conveying rate is 8-10m / min, and the size of the cooling platform is 1500mm×1500mm; the vacuum adsorption box of the asphalt negative pressure adsorption device is connected to the No. 3 stirring device, and the cooling platform of the asphalt negative pressure adsorption device is connected to the feed port of the water washing stirring device.

[0025] Specifically, the water washing and stirring device includes a water washing high-pressure nozzle located at the top thereof, and a spiral blade is also provided inside the water washing and stirring device. The water washing and stirring device is also provided with a water-washed asphalt phase change biochar discharge port, and the water-washed asphalt phase change biochar discharge port is also provided with a water-washed phase change biochar screen for filtering the phase change biochar suspension, and the water-washed phase change biochar screen is provided with a water-washed phase change biochar discharge port for collecting the phase change biochar suspension; the water-washed phase change biochar screen is a 3mm screen.

[0026] The water washing and stirring device is used to clean the phase change biochar powder on the surface of the asphalt milling material and further stir the asphalt phase change biochar.

[0027] The upper outer shell of the water washing and stirring device is evenly distributed with small round holes, which facilitate the water from the water washing high-pressure nozzle to enter the spiral blades to achieve the purpose of water washing; the function of water washing and stirring is to clean the phase change biochar particles on the surface of the asphalt milling material, and the water washing phase change biochar sieve is used to separate the asphalt phase change biochar solids and the phase change biochar suspension, and the phase change biochar suspension is recycled for secondary use; the water washed asphalt phase change biochar discharge port of the water washing and stirring device is connected to the inner shell material spraying device.

[0028] Specifically, the water-washed phase change biochar discharge port is connected to a centrifugal device for separating a phase change biochar suspension through a water pipe, and the centrifugal device is connected to a recovered phase change biochar feed port through a solid belt conveyor.

[0029] Specifically, the centrifugal device includes a centrifugal motor, which drives the drum shaft to rotate through a belt. The drum shaft is fixedly connected to the drum, so that the drum rotates centrifugally. The phase change biochar suspension enters the drum from the phase change biochar suspension inlet. A scraper is provided on the top of the drum for scraping the phase change biochar residue, so that the phase change biochar residue after centrifugation is discharged from the phase change biochar residue outlet to the solid belt conveyor. The bottom of the centrifugal device is also provided with a filtrate outlet; the centrifugal device can realize the recycling of the filtrate and reduce material loss.

[0030] Specifically, the three-shell processing device includes an inner shell material spraying device, an inner shell material stirring device, a middle shell material spraying device, a middle shell stirring device, an outer shell material spraying device and an outer shell stirring device connected in sequence; the inner shell material spraying device is connected to the water-washed asphalt phase change biochar of the water-washing stirring device, and the discharge port is connected;

[0031] The inner shell material spraying device is used to spray the inner shell material onto the asphalt phase change biochar, wherein the inner shell material is a combination of a nano-film-forming component A and a nano-film-forming component B, wherein the nano-film-forming component A is a mixture of epoxy asphalt and epoxy resin, and the nano-film-forming component B is a mixture of oxidized spherical nanocellulose and sodium chloride; the inner shell material mainly has a "rooting" effect, has strong adhesion to the asphalt phase change biochar, and can penetrate a certain thickness;

[0032] The middle shell material spraying device is used to spray the middle shell material onto the inner shell asphalt phase change biochar, wherein the middle shell material is SiO2 nanomaterial (nano-enhanced material);

[0033] The shell material spraying device is used to spray the shell material onto the asphalt phase change biochar having a middle shell material and an inner shell. The shell material is an SBS modifier (styrene-butadiene-styrene triblock copolymer). The function of the shell material is to improve the interface transition zone with the cement matrix and enhance the adhesion of the material to the cement matrix.

[0034] The specific inner shell material stirring device is used to mix the inner shell material with the asphalt phase change biochar; the middle shell material stirring device is used to mix the middle shell material with the asphalt phase change biochar adhered to the inner shell material; the outer shell material stirring device is used to mix the outer shell material with the asphalt phase change biochar with the inner shell material and the middle shell material.

[0035] Specifically, the No. 1 stirring device, No. 2 stirring device, No. 3 stirring device, water washing stirring device, inner shell material stirring device, middle shell material stirring device, and outer shell material stirring device all adopt a drum stirring method, with a horizontal inclination angle of 10°, and contain a spiral blade group inside, with a rotation speed of 8r / min.

[0036] Specifically, the crushing belt conveyor is used to convey the first crushed asphalt milling material of the crusher and the asphalt milling material particles after screening to remove iron; the dust removal belt conveyor is used to convey the asphalt milling material particles after high-pressure water washing and screening; the solid belt conveyor is used to convey the phase change biochar particles;

[0037] The transmission rates of the crushing belt conveyor, dust removal belt conveyor and solid belt conveyor are all 30cm / s, the maximum conveying capacity is 80t / h, the maximum power is 8kW, the crushing belt conveyor and dust removal belt conveyor are both horizontally inclined at 32°, and the solid belt conveyor is placed horizontally.

[0038] Compared with the prior art, the technical solution provided by the utility model includes the following beneficial effects:

[0039] The utility model adopts modular design, each component operates independently, and when a certain module component is damaged, it can be quickly replaced, the maintenance time is short, and the production cost is low.

[0040] The utility model adopts a temperature-controlled phase change material and a biochar spraying device loaded with phase change material, which can adjust the temperature in real time, so that the phase change material can be evenly and stably filled in the pores of the biochar and asphalt milling material, thereby improving the compactness of the material; an asphalt negative pressure adsorption device is adopted to utilize a high-pressure environment to deeply press the biochar loaded with phase change material into the asphalt milling material, thereby ensuring the filling effect of the material and making the performance of the obtained self-repairing recycled aggregate better.

[0041] The preparation device of self-repairing recycled aggregate provided by the utility model can fill biochar loaded with phase change material in asphalt milling material, and at the same time wrap three layers of shell on the surface of the phase change material of the asphalt milling material, so that it has the characteristics of good adhesion, high strength, and good connection with the interface transition zone of the asphalt mixture, thereby realizing efficient and low-carbon preparation of self-repairing recycled aggregate. The prepared self-repairing recycled aggregate can effectively repair the problem of cracking of asphalt pavement caused by large temperature difference, and extend the working life of the pavement. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings herein are incorporated into and constitute a part of this specification, and together with the description, are used to explain the principles of the present utility model.

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0044] Figure 1 This is a schematic diagram of the principle of the preparation device of the utility model;

[0045] Figure 2 It is a schematic diagram of the rough processing device of the utility model;

[0046] Figure 3 It is a schematic diagram of the centrifugal device of the utility model;

[0047] Figure 4 It is a schematic diagram of the phase change biochar spraying device of the utility model;

[0048] Figure 5 It is a schematic diagram of the asphalt negative pressure adsorption device of the utility model;

[0049] Figure 6 It is a schematic diagram of the water washing and stirring device of the utility model.

[0050] Among them: 1 is a phase change material spraying device; 2 is a stirring device No. 1; 3 is a high viscosity modifier spraying device; 4 is a stirring device No. 2; 5 is a crusher; 6 is a crushing belt conveyor; 7 is a water washing and dust removal device; 8 is a dust removal belt conveyor; 9 is a rough treatment device; 91 is a rough treatment box; 92 is a rough treatment working chamber; 93 is a high-pressure air inlet; 94 is a high-speed asphalt outlet; 95 is an asphalt rough treatment outlet; 96 is an asphalt storage chamber; 97 is an asphalt drop port; 10 is an asphalt milling material conduit; 11 is a phase change biochar spraying device; 12 is a stirring device No. 3; 13 is an asphalt negative pressure adsorption device; 14 is a water washing and stirring device; 15 is a water guide pipe; 16 is a centrifugal device; 161 is a centrifugal motor; 162 is a drum shaft; 163 is a drum; 164 is a scraper; 165 is an inlet for a phase change biochar suspension; 166 is the phase change biochar residue outlet; 167 is the filtrate outlet; 17 is a solid belt conveyor; 18 is an inner shell material spraying device; 19 is an inner shell material stirring device; 20 is a middle shell material spraying device; 21 is a middle shell material stirring device; 22 is an outer shell material spraying device; 23 is an outer shell material stirring device; 24 is a phase change biochar feed port; 25 is an asphalt milling material discharge port; 26 is a recycled phase change biochar feed port; 27 is a phase change biochar temperature control device; 28 is a phase change biochar nozzle; 29 is a second belt conveyor; 30 is a vacuum adsorption box; 31 is a third belt conveyor; 32 is a cooling platform; 33 is a water spray conduit; 34 is a spiral blade; 35 is a water-washed high-pressure nozzle; 36 is a water-washed asphalt phase change biochar discharge port; 37 is a water-washed phase change biochar screen; 38 is a water-washed phase change biochar discharge port. DETAILED DESCRIPTION

[0051] Here, exemplary embodiments will be described in detail, and examples thereof are shown in the accompanying drawings. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present utility model. Instead, they are only examples consistent with some aspects of the present utility model as detailed in the attached claims.

[0052] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0053] Example

[0054] This embodiment provides a preparation device for self-repairing recycled aggregate for cold region highway maintenance, comprising:

[0055] A crusher 5 for screening asphalt milling materials, the crusher 5 is sequentially connected with a water washing and dust removal device 7, a rough treatment device 9 for asphalt milling materials, a phase change biochar spraying device 11, a third stirring device 12, an asphalt negative pressure adsorption device 13, and a water washing and stirring device 14, and the water washing and stirring device 14 is also connected with a three-shell treatment device for enhancing the adhesion of the asphalt milling materials;

[0056] Phase change material and high viscosity modifier treatment device, the phase change material and high viscosity modifier treatment device is connected to the phase change biochar spraying device 11, see Figure 1 shown.

[0057] Specifically, the crusher 5 includes a first vibrating screen, and the first vibrating screen is connected to the water washing and dust removal device 7 through a crushing belt conveyor 6.

[0058] Specifically, the water-washing dust removal device 7 includes a plurality of dust removal high-pressure nozzles arranged at the top thereof and a second vibrating screen group arranged at the bottom, and the second vibrating screen group is connected to the rough processing device 9 through a dust removal belt conveyor 8.

[0059] Specifically, the roughing treatment device 9 includes a roughing treatment box 91, and a roughing treatment working chamber 92 is provided in the roughing treatment box 91. The asphalt milling material in the dust removal belt conveyor 8 enters the roughing treatment working chamber 92. The roughing treatment working chamber 92 is also provided with an asphalt drop port 97 that can drop into the asphalt receiving chamber 96. The roughing treatment working chamber 92 is provided with a high-speed asphalt outlet 94. The asphalt receiving chamber 96 is connected to the high-speed asphalt outlet 94. The high-speed asphalt outlet 94 is provided with a high-pressure air inlet 93. Figure 2 shown.

[0060] The asphalt milling material conduit 10 is connected to the phase change biochar spraying device 11, and the phase change biochar spraying device 11 includes a phase change biochar storage device located at the top and a second belt conveyor 29 located at the bottom;

[0061] The phase change biochar storage device includes a phase change biochar feed port 24, a recovered phase change biochar feed port 26, a phase change biochar temperature control device 27, and a phase change biochar nozzle 28; the asphalt milling material outlet 25 of the asphalt milling material conduit 10 is arranged near the starting end of the second belt conveyor 29;

[0062] The phase change biochar feed port 24 is connected to the phase change material and high viscosity modifier processing device.

[0063] Specifically, the phase change material and high viscosity modifier processing device includes a phase change material spraying device 1, a stirring device No. 1 2, a high viscosity modifier spraying device 3, and a stirring device No. 2 4 which are connected in sequence, and the stirring device No. 2 4 is connected to the phase change biochar spraying device 11.

[0064] Specifically, the phase change material spraying device 1 has the same structure as the high viscosity modifier spraying device 3. The phase change material spraying device 1 is provided with a material storage box at the top, a first belt conveyor at the bottom, a temperature control device in the material storage box, and a material high pressure nozzle for spraying the phase change material. Figure 4 shown.

[0065] Specifically, the asphalt negative pressure adsorption device 13 includes a vacuum adsorption box 30, which is arranged on a third belt conveyor 31. The third belt conveyor 31 is also connected to a cooling platform 32, and a water spraying conduit 33 is arranged on the cooling platform 32. Figure 5 shown.

[0066] Specifically, the water washing stirring device 14 includes a water washing high pressure nozzle 35 located at the top thereof, and a spiral blade 34 is also provided inside the water washing stirring device 14. The water washing stirring device 14 is also provided with a water-washed asphalt phase change biochar discharge port 36, and the water-washed asphalt phase change biochar discharge port 36 is also provided with a water-washed phase change biochar screen 37 for filtering the phase change biochar suspension, and the water-washed phase change biochar screen 37 is provided with a water-washed phase change biochar discharge port 38 for collecting the phase change biochar suspension, see Figure 6 shown.

[0067] Specifically, the water-washed phase-change biochar discharge port 38 is connected to a centrifugal device 16 for separating a phase-change biochar suspension through a water pipe 15 , and the centrifugal device 16 is connected to a phase-change biochar spraying device 11 through a solid belt conveyor 17 .

[0068] Specifically, the centrifugal device 16 includes a centrifugal motor 161, and the centrifugal motor 161 drives the drum shaft 162 to rotate through a belt, so that the drum 163 rotates centrifugally, and the phase change biochar suspension enters the drum 163 from the phase change biochar suspension inlet 165. A scraper 164 is provided on the top of the drum 163 for scraping the phase change biochar residue, so that the phase change biochar residue after centrifugation is discharged from the phase change biochar residue outlet 166 to the solid belt conveyor 17. The bottom of the centrifugal device 16 is also provided with a filtrate outlet 167, see Figure 3 shown.

[0069] Specifically, the three-shell processing device includes an inner shell material spraying device 18, an inner shell material stirring device 19, a middle shell material spraying device 20, a middle shell material stirring device 21, an outer shell material spraying device 22 and an outer shell material stirring device 23 which are connected in sequence; the inner shell material spraying device 18 is connected to the water washing stirring device 14.

[0070] See also Figure 1 As shown, this embodiment also provides a method for using a device for preparing self-repairing recycled aggregate for cold region highway maintenance, which is specifically as follows:

[0071] First, large pieces of asphalt milling material are put into the crusher 5 for crushing. The crushed asphalt milling material passes through the first vibrating screen to screen out the asphalt milling material with a small particle size, passes through the first magnet roller to remove the iron in the asphalt milling material, and then the asphalt milling material is transported to the water washing dust removal device 7 through the crushing belt conveyor 6. At the same time, the dust removal high-pressure nozzle is turned on to clean the dust on the surface of the asphalt milling material. The second vibrating screen group is started to remove the small particles of the asphalt milling material below 6 mm, and the remaining iron in the asphalt milling material is removed through the second magnet roller. Then the asphalt milling material is conveyed through the dust removal belt. The machine 8 enters the roughing treatment working chamber 92 from the roughing treatment box 91, and at the same time, part of the particles of the asphalt milling material falls into the asphalt receiving chamber 96 through the asphalt dropping port 97, and then is transported to the high-speed asphalt outlet 94 through the pipeline. The high-speed airflow through the high-pressure air inlet 93 drives the asphalt milling material particles to collide with the asphalt milling material in the roughing treatment working chamber 92 at high speed, making the surface of the asphalt milling material rough. The roughened asphalt milling material enters the asphalt milling material conduit 10 from the asphalt roughing treatment outlet 95, and then falls from the asphalt milling material outlet 25 to the second belt conveyor 29;

[0072] At the same time, the solid-liquid phase change material is loaded into the storage box of the phase change material spraying device 1, and the temperature of the solid-liquid phase change material in the storage box is adjusted to 80°C by the temperature control device, and the high viscosity modifier is loaded into the storage box of the high viscosity modifier spraying device 3, and the temperature of the high viscosity modifier in the storage box is adjusted to 150°C by the temperature control device; then, when the biochar powder passes through the phase change material spraying device 1, the solid-liquid phase change material is sprayed into the pores of the biochar, and then it is stirred evenly by the first stirring device 2 and enters the high viscosity modifier spraying device 3, and the high viscosity modifier is sprayed when passing through the high viscosity modifier spraying device 3. The modifier can enhance the adhesion between the phase change material and the pore wall of the biochar; the biochar loaded with the phase change material (phase change biochar) is stirred evenly by the second stirring device 4 to obtain a phase change biochar suspension, and then enters the phase change biochar storage device from the phase change biochar feed port 24, at this time, the phase change biochar is sprayed to the asphalt milling material on the second belt conveyor 29 through the phase change biochar nozzle 28, and then the asphalt milling material adhered with the phase change biochar is transported to the third stirring device 12 through the second belt conveyor 29, and the phase change biochar and the asphalt milling material are stirred evenly to obtain the asphalt phase change biochar;

[0073] Then, the asphalt phase-change biochar enters the vacuum adsorption box 30, so that the phase-change biochar can be deeply filled into the asphalt milling material. The obtained asphalt phase-change biochar is transported to the cooling platform 32 (provided with a belt conveyor) through the third belt conveyor 31, and is cooled rapidly through air cooling and water cooling of the water spray pipe 33; then the cooled asphalt phase-change biochar is transported to the water washing and stirring device 14, at which time the water washing high-pressure nozzle 35 sprays water to clean the excess phase-change biochar on the surface of the asphalt phase-change biochar, and the spiral blade 34 stirs to make the cleaning more thorough. After the cleaning is completed, the asphalt phase-change biochar is filtered out of the phase-change biochar suspension through the water-washing phase-change biochar screen 37, and then is transported to the inner shell material spraying device 18 from the water-washing phase-change biochar discharge port 38;

[0074] At the same time, the cleaned phase change biochar suspension passes through the water-washed phase change biochar screen 37 and then enters the drum 163 in the centrifugal device 16 from the water-washed phase change biochar discharge port 38, the water guide pipe 15, and the phase change biochar suspension inlet 165. The drum 163 separates the phase change biochar and the filtrate in the phase change biochar suspension driven by the centrifugal motor 161, and the filtrate is discharged from the device from the filtrate outlet 167, while the phase change biochar residue is scraped to the phase change biochar residue outlet 166 by the scraper 164, transported by the solid belt conveyor 17 and through the recovered phase change biochar feed port 26 to enter the phase change biochar storage device, and then sprayed to the asphalt milling material on the second belt conveyor 29 through the phase change biochar nozzle 28, so that the phase change biochar is recycled and reused, thereby reducing production costs;

[0075] Finally, the asphalt phase change biochar enters the inner shell material spraying device 18 from the water-washed asphalt phase change biochar discharge port 36, and is sprayed with the inner shell material (a mixture of nano-film-forming component A (a mixture of epoxy asphalt and epoxy resin) and nano-film-forming component B (a mixture of oxidized spherical nanocellulose and sodium chloride)) that makes the asphalt phase change biochar have strong adhesion, and then enters the middle shell material spraying device 20 after being evenly stirred by the inner shell material stirring device 19, and is sprayed with the middle shell material (SiO2 nanomaterial), and then is evenly stirred by the middle shell material stirring device 21, and enters the outer shell material spraying device 22 to spray the outer shell material (SBS modifier - styrene-butadiene-styrene triblock copolymer) used to enhance the adhesion of the asphalt phase change biochar to the cement matrix, and then is stirred by the outer shell material stirring device 23, and is discharged from the discharge port of the outer shell material stirring device 23 to obtain self-repairing recycled aggregate for cold region highway maintenance.

[0076] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention.

[0077] It should be understood that the present invention is not limited to the above-described contents, and various modifications and changes can be made without departing from its scope. The scope of the present invention is limited only by the appended claims.

Claims

1. A preparation device for self-repairing recycled aggregate for cold region highway maintenance, characterized in that: include: A crusher (5) for screening asphalt milling materials, the crusher (5) being sequentially connected to a water washing and dust removal device (7), a rough treatment device for asphalt milling materials (9), a phase change biochar spraying device (11), a third stirring device (12), an asphalt negative pressure adsorption device (13), and a water washing and stirring device (14), wherein the water washing and stirring device (14) is further connected to a three-shell treatment device for enhancing the adhesion of the asphalt milling materials; A phase change material and high viscosity modifier treatment device is connected to a phase change biochar spraying device (11).

2. The preparation device according to claim 1, characterized in that: The crusher (5) comprises a first vibrating screen, which is connected to a water-washing dust removal device (7) via a crushing belt conveyor (6).

3. The preparation device according to claim 1, characterized in that: The water-washing dust removal device (7) comprises a plurality of dust removal high-pressure nozzles arranged at the top thereof and a second vibrating screen group arranged at the bottom, and the second vibrating screen group is connected to the rough processing device (9) via a dust removal belt conveyor (8).

4. The preparation device according to claim 1, characterized in that: The roughening treatment device (9) is connected to the phase-change biochar spraying device (11) via the asphalt milling material conduit (10), and the phase-change biochar spraying device (11) comprises a phase-change biochar storage device located at the top and a second belt conveyor (29) located at the bottom; The phase-change biochar storage device comprises a phase-change biochar feed port (24), a recovered phase-change biochar feed port (26), a phase-change biochar temperature control device (27) and a phase-change biochar nozzle (28); the asphalt milling material discharge port (25) of the asphalt milling material conduit (10) is arranged near the starting end of the second belt conveyor (29); The phase change biochar feed port (24) is connected to a phase change material and a high viscosity modifier processing device.

5. The preparation device according to claim 1, characterized in that: The phase change material and high viscosity modifier processing device comprises a phase change material spraying device (1), a first stirring device (2), a high viscosity modifier spraying device (3), and a second stirring device (4) which are connected in sequence, and the second stirring device (4) is connected to the phase change biochar spraying device (11).

6. The preparation device according to claim 5, characterized in that: The phase change material spraying device (1) has the same structure as the high viscosity modifier spraying device (3), and is provided with a material storage box at the top, a first belt conveyor at the bottom, a temperature control device located in the material storage box, and a material high-pressure nozzle for spraying the phase change material onto the first belt conveyor.

7. The preparation device according to claim 1, characterized in that: The asphalt negative pressure adsorption device (13) comprises a vacuum adsorption box (30), wherein the vacuum adsorption box (30) is arranged on a third belt conveyor (31), and the third belt conveyor (31) is also connected to a cooling platform (32), and a water spraying conduit (33) is provided on the cooling platform (32).

8. The preparation device according to claim 1, characterized in that: The water-washing stirring device (14) comprises a water-washing high-pressure nozzle (35) located at the top thereof, and a spiral blade (34) is also provided inside the water-washing stirring device (14). The water-washing stirring device (14) is also provided with a water-washed asphalt phase-change biochar discharge port (36), and the water-washed asphalt phase-change biochar discharge port (36) is also provided with a water-washed phase-change biochar screen (37) for filtering a phase-change biochar suspension, and the water-washed phase-change biochar screen (37) is provided with a water-washed phase-change biochar discharge port (38) for collecting the phase-change biochar suspension.

9. The preparation device according to claim 8, characterized in that: The water-washed phase-change biochar discharge port (38) is connected to a centrifugal device (16) for separating a phase-change biochar suspension via a water conduit (15), and the centrifugal device (16) is connected to a phase-change biochar spraying device (11) via a solid belt conveyor (17).

10. The preparation device according to claim 1, characterized in that: The three-shell processing device comprises an inner shell material spraying device (18), an inner shell material stirring device (19), a middle shell material spraying device (20), a middle shell material stirring device (21), an outer shell material spraying device (22) and an outer shell material stirring device (23) which are connected in sequence; the inner shell material spraying device (18) is connected to the water washing stirring device (14).

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