A RAP asphalt mixture asphalt extraction device

Abstract

A RAP asphalt mixture asphalt extraction device relates to the field of road engineering material testing technology, and is used to solve the problems of insufficient filtration accuracy, low filtration efficiency, cumbersome operation, and lack of flow monitoring in existing technologies. The device includes an integrated frame (1), on which a stirring extraction module (2) and a pressurized filtration module (3) are installed. The liquid outlet of the stirring extraction module (2) is connected to the liquid inlet of the pressurized filtration module (3) through a guide pipe (5). The pressurized filtration module (3) includes three industrial syringe assemblies connected in series. Each assembly contains filter plates with different filtration accuracies. The device also includes the connection and working cooperation between the propulsion assembly and the syringe plunger (301-1) of the industrial syringe assembly. Gradient filtration is achieved by sequentially passing through a three-stage filtration unit with millimeter-level filtration layer, micron-level filtration layer, and nano-level filtration layer. This device can realize integrated operation, gradient filtration purification, pressurized high-efficiency filtration, and real-time monitoring of liquid flow.

Description

Technical Field

[0001] This utility model relates to the field of road engineering material testing technology, and in particular to a device for extracting asphalt from RAP asphalt mixtures. Background Technology

[0002] In the field of road recycling, the extraction and testing of asphalt from RAP (Reclaimed Asphalt Pavement) is a crucial step in determining the recycling mix design. Currently, the mainstream extraction technology is solvent extraction, which involves dissolving the asphalt in RAP using organic solvents, followed by filtration, separation, and evaporation to obtain an asphalt sample for subsequent performance testing and mix design.

[0003] Chinese patent CN112323571A discloses a highway waste asphalt recycling device, including a multi-stage crusher, a stirred extraction tank, a solvent feeding mechanism, a filtration and separation mechanism, a distillation assembly, a solvent recovery mechanism, and an asphalt storage assembly. This device uses a stirred extraction tank to mix and dissolve RAP material with a composite solvent, and a filtration and separation mechanism to separate the extracted mixture into solid and liquid components. The filtration and separation mechanism includes a fixed cylinder, a first sieve cylinder, and a second sieve cylinder. The outer diameter of the first sieve cylinder is smaller than the inner diameter of the second sieve cylinder, and the mesh size of the first sieve cylinder is larger than that of the second sieve cylinder. Centrifugal rotation is used to separate the sand and gravel from the extracted mixture.

[0004] However, the aforementioned existing technologies have the following shortcomings: First, the use of only two-stage sieve cylinders for solid-liquid separation results in limited sieve mesh precision, making it difficult to remove impurities of different particle sizes. This leads to residual fine particulate impurities in the extracted asphalt samples, affecting the accuracy of subsequent performance testing. Second, relying on centrifugal rotation for filtration separation results in slow filtration speeds for asphalt solutions with high viscosity, making it difficult to meet the needs of batch testing in laboratories. Third, material transfer between extraction and filtration stages still requires manual operation of the gates, involving numerous steps and increasing human error and solvent evaporation losses. Fourth, the device contains multiple independent functional modules, resulting in a relatively dispersed overall structure that occupies laboratory space and is not conducive to laboratory testing applications. Fifth, the device lacks real-time detection and visualization capabilities for liquid flow, making it impossible for operators to monitor the liquid flow status during extraction and filtration processes in real time. This makes it difficult to detect abnormalities such as pipe blockages and leaks in a timely manner, potentially leading to process interruptions or deviations in test results.

[0005] Therefore, there is a need for a RAP asphalt extraction device that is compact, has a simplified process, high filtration accuracy and efficiency, and is equipped with real-time monitoring of feed flow rate to meet laboratory testing requirements. Summary of the Invention

[0006] The purpose of this invention is to provide a RAP asphalt mixture asphalt extraction device to solve the following technical problems existing in the prior art:

[0007] (1) The existing technology only uses two-stage sieve cylinders for solid-liquid separation. The sieve mesh accuracy is limited, making it difficult to remove impurities of different particle sizes. It cannot achieve gradient filtration at the millimeter, micrometer, and nanometer levels, resulting in fine particulate impurities remaining in the extracted asphalt sample, which affects the accuracy of subsequent performance testing.

[0008] (2) Existing technology relies on centrifugal rotation force for filtration and separation. For asphalt solutions with high viscosity, the filtration speed is slow and the filtration efficiency is low, which is difficult to meet the needs of batch testing in the laboratory.

[0009] (3) In the existing technology, the material transfer between the extraction and filtration stages still requires manual operation of the gate opening and closing, which involves many operation steps, increasing manual operation errors and solvent evaporation losses;

[0010] (4) Existing technologies contain multiple independent functional modules, the overall structure is relatively dispersed, the device is large in size, occupies laboratory space, and is not conducive to laboratory testing applications;

[0011] (5) Existing technologies lack flow detection and visualization functions, cannot monitor liquid flow in real time, have a low level of intelligence, and operators have difficulty in timely detecting abnormalities such as pipeline blockage and leakage, which can easily affect the continuity of the process and the accuracy of the detection results.

[0012] To achieve the above objectives, the present invention adopts the following technical solution:

[0013] This utility model provides a RAP asphalt mixture asphalt extraction device, including an integrated frame (1), on which a stirring extraction module (2) and a filtration module are provided. The liquid outlet of the stirring extraction module (2) is connected to the liquid inlet of the filtration module through a guide pipe (5). The filtration module is a pressure filtration module (3). The pressure filtration module (3) includes three industrial syringe assemblies connected in series. Each industrial syringe assembly is equipped with a filter plate with different filtration precision in sequence. The pressure filtration module (3) also includes a propulsion assembly, which acts on the syringe plunger (301-1) of the industrial syringe assembly.

[0014] By adopting an integrated bench design, the core processes of stirring extraction and pressurized filtration are integrated on the same bench. The modules are connected through the guide pipe (5), eliminating the need for manual intervention in solution transfer. This achieves full automation from feeding to filtration, reducing solvent evaporation and operational errors.

[0015] Furthermore, the frame (1) includes an extraction stirring frame (101) and a pressure filtration frame (102); the extraction stirring frame (101) includes an extraction stirring pot main body frame (101-1), a buckle (101-2), and a stirring extraction transmission frame (101-3); the pressure filtration frame (102) is provided with three workstations for installing the industrial syringe assembly. The frame (1) adopts an integrated welded structure, and the positional relationship between the components is fixed, ensuring the overall stability of the device and the smooth flow of materials.

[0016] Furthermore, the pressurized filtration module (3) includes a syringe holder (301-3), a propulsion assembly, and a three-stage filtration unit; the three-stage filtration unit is composed of a first industrial syringe, a second industrial syringe, and a third industrial syringe connected in series; the first industrial syringe has a millimeter-level filter layer (303-1), the second industrial syringe has a micrometer-level filter layer (303-2), and the third industrial syringe has a nanometer-level filter layer (303-3). Through the three-stage series industrial syringe filtration system, the feed liquid flows sequentially through millimeter-level, micrometer-level, and nanometer-level filter plates, achieving gradient removal of impurities of different particle sizes and effectively improving the purity of the extracted asphalt sample.

[0017] Furthermore, the propulsion assembly includes a hydraulic rod (302-5), a hydraulic rod motor (302-4), a propulsion screw (302-3), and a pressurized propulsion platform (302-2); the hydraulic rod (302-5) has a variable length and includes an inner section and an outer section; the inner section of the hydraulic rod (302-5) is connected to the hydraulic rod motor (302-4), and the fixed end of the inner section of the hydraulic rod (302-5) and the base of the hydraulic rod motor (302-4) are both mounted on a limiting platform (302-2). On 302-1), the outer section of the hydraulic rod (302-5), the pressurizing push platform (302-2), and the syringe plunger (301-1) of the industrial syringe are fixedly connected from top to bottom as a whole; the limiting platform (302-1) is fixedly connected to the top end of the push screw (302-3), the syringe fixing seat (301-3) is fixedly connected to the bottom end of the push screw (302-3), and the pressurizing push platform (302-2) is slidably connected to the push screw (302-3). The hydraulic rod motor (302-4) drives the hydraulic rod (302-5), which drives the pressurizing push platform (302-2) to move vertically along the push screw (302-3), thereby pressing down each syringe plunger (301-1) and applying adjustable pressure to the internal liquid. By applying external pressure, the filtration process of the liquid is accelerated, and the filtration efficiency is significantly improved.

[0018] Furthermore, the syringe plunger (301-1) is provided with a sealing piston at its end, which is in a sealing fit with the inner wall of the syringe housing (301-2). The sealing piston and the inner wall of the syringe housing (301-2) achieve a sealing fit, which avoids leakage of liquid during pressurization and ensures the filtration effect.

[0019] Furthermore, the stirring extraction module (2) includes a pot device (201), a drive assembly, and a liquid outlet pipeline; the pot device (201) includes a pot body (201-1), and a liquid outlet (201-3) is provided at the bottom of the pot body (201-1); the drive assembly is connected to the stirring blades disposed in the pot body (201-1) for driving the stirring blades to rotate; one end of the liquid outlet pipeline is connected to the liquid outlet (201-3), and the other end is connected to the guide pipeline (5). The stirring extraction module (2) drives the stirring blades to rotate through the drive assembly, causing the RAP material and solvent to tumble and stir, avoiding material sedimentation, ensuring that the liquid is fully mixed and dissolved, and improving the extraction efficiency.

[0020] Further, the driving assembly includes a homogenizing stirring device (202) and a wall-scraping stirring device (203); the homogenizing stirring device (202) includes a homogenizing stirring motor (202-3), a homogenizing stirring shaft (202-2), and a homogenizing stirring blade, the homogenizing stirring shaft (202-2) being rotatably disposed within the pot body (201-1), and the homogenizing stirring blade being fixedly connected to the homogenizing stirring shaft (202-2); the wall-scraping stirring device (203) includes a wall-scraping stirring motor (203-3), a wall-scraping stirring shaft (203-2), and a wall-scraping stirring blade, the wall-scraping stirring shaft (203-2) being rotatably disposed within the pot body (201-1), and the wall-scraping stirring blade being fixedly connected to the wall-scraping stirring shaft (203-2). The homogenizing stirring blades rotate within the pot to achieve overall mixing, while the scraping stirring blades rotate along the inner wall of the pot to prevent material from depositing on the bottom and walls. The two stirring methods work together to increase the contact area between the RAP material and the solvent, ensuring sufficient extraction.

[0021] Preferably, the homogenizing stirring motor (202-3) is driven to the homogenizing stirring shaft (202-2) via the homogenizing stirring conveyor belt (202-5); the wall-scraping stirring motor (203-3) is driven to the wall-scraping stirring shaft (203-2) via the wall-scraping stirring conveyor belt (203-5). The conveyor belt drive method is simple, reliable, and easy to install and maintain.

[0022] Furthermore, the wall-scraping stirring blades are uniformly welded along the circumference of the inner wall of the pot body (201-1). The uniform welding of the wall-scraping stirring blades along the circumference of the inner wall of the pot body (201-1) effectively drives the RAP material and organic solvent to tumble and stir during the rotation of the stirring blades, preventing material from settling at the bottom of the pot body and ensuring thorough mixing of the liquid.

[0023] Furthermore, the stand (1) is also equipped with a control mechanism (4), which is connected to the stirring extraction module (2) and the pressure filtration module (3) respectively. The control mechanism (4) includes a control system assembly (401), an emergency stop button (402), and a control operation panel (403). The control operation panel (403) is electrically connected to the control system assembly (401). The control system assembly (401) is electrically connected to each motor in the stirring extraction module (2) and the pressure filtration module (3) respectively through relays. The control mechanism (4) realizes centralized control and management of the stirring extraction module (2) and the pressure filtration module (3). The control operation panel (403) can intuitively display the operating parameters and working status of each module, and at the same time supports manual setting of process parameters such as extraction speed, extraction time and filtration pressure. The operation is convenient and improves the automation level of the device.

[0024] Furthermore, the platform (1) is an integral welded structure. The integral welded structure of the platform (1) ensures the stability of the device during operation.

[0025] Furthermore, the flow guide pipe (5) is made of corrosion-resistant material. The flow guide pipe (5) is made of corrosion-resistant material, which is compatible with organic solvents such as trichloroethylene, ensuring the service life and safety of the device.

[0026] Furthermore, the device also includes a flow detection system (6), which includes three flow sensors and a data transmission module. The flow sensors are all installed in the middle of the guide pipe (5). The flow sensors are electrically connected to the control system assembly (401) of the control mechanism (4) through the data transmission module. The control operation panel (403) is provided with a flow visualization display area for real-time display of liquid flow data. The flow detection system (6) works in conjunction with the control mechanism (4) to realize real-time detection and data visualization of liquid flow. Operators can intuitively grasp the operating status of the extraction and filtration processes and promptly detect abnormalities such as pipe blockage and leakage.

[0027] Preferably, the flow sensor is a turbine flow sensor, and the data transmission module uses a wired transmission method. The turbine flow sensor has the characteristics of corrosion resistance and resistance to interference from viscous media, and can adapt to the working environment of asphalt extract and organic solvents; the wired transmission method ensures the stability and real-time performance of flow data transmission.

[0028] The beneficial effects of this utility model are as follows:

[0029] (1) Integrated design to improve operational efficiency: The core processes of stirring extraction and pressurized filtration are integrated into an integrated stand (1). The modules are connected through the guide pipe (5), realizing that the entire process from feeding to filtration does not require manual transfer of solution, which improves the overall efficiency of asphalt extraction. At the same time, it effectively reduces the error caused by manual operation and solvent evaporation, ensuring the stability and repeatability of the extraction process, and is suitable for laboratory testing needs.

[0030] (2) Multi-stage gradient filtration to improve asphalt purity: A three-stage series industrial syringe filtration system was constructed. Through the step-by-step filtration of millimeter-level filter layer (303-1), micron-level filter layer (303-2), and nano-level filter layer (303-3), various mineral impurities in the feed liquid were effectively removed. The purity of the extracted asphalt sample met the testing requirements, providing test specimens for subsequent performance testing of aged asphalt in RAP materials and ensuring the accuracy of the test results.

[0031] (3) Pressure filtration to improve filtration efficiency: The pressure filtration mechanism is adopted by using a hydraulic rod (302-5) and a pressure pusher (302-2) on the pusher screw (302-3) to push the syringe plunger (301-1). The plunger is pushed to apply adjustable pressure, and the filtration process of the liquid is accelerated by external pressure, which significantly improves the filtration efficiency and meets the needs of batch testing in the laboratory.

[0032] (4) Dual stirring system to ensure sufficient extraction: The two stirring methods of homogenizing stirring device (202) and wall scraping stirring device (203) work together to increase the contact area between RAP material and organic solvent, avoid material deposition, ensure that the liquid is fully mixed and dissolved, and improve the extraction efficiency.

[0033] (5) Real-time flow detection and visualization: The flow detection system (6) realizes real-time detection and data visualization of the liquid flow. Operators can intuitively grasp the operating status of the extraction and filtration process, promptly detect abnormalities such as pipeline blockage and leakage, control the flow of the liquid after filtration, avoid liquid backflow during the filtration process, and improve the intelligence level of the device. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the overall structure of the RAP asphalt mixture asphalt extraction device.

[0035] Figure 2 for Figure 1 A schematic diagram of the overall structure of the device from another perspective.

[0036] Figure 3 This is a structural schematic diagram of the integrated stand (1).

[0037] Figure 4 This is a partial structural diagram of the stirring extraction module (2).

[0038] Figure 5 This is a partial structural breakdown diagram of the stirring extraction module (2).

[0039] Figure 6 This is a partial structural diagram of the pressurized filter module (3).

[0040] Figure 7 A partial structural breakdown diagram of the pressurized filter module (3).

[0041] Figure 8 This is a schematic diagram of the structure of the control mechanism (4) and the flow detection system (6).

[0042] Figure 9 This is a detailed internal structural diagram of the wall-scraping agitator (203). Detailed Implementation

[0043] The specific embodiments of this utility model will be described in detail with reference to the accompanying drawings. It should be noted that the meanings of the reference numerals used in the following embodiments are as follows: 1 represents an integrated frame; 101 represents an extraction stirring frame; 101-1 represents the main frame of the extraction stirring pot; 101-2 represents a buckle; 101-3 represents a stirring extraction transmission frame; 102 represents a pressure filtration frame; 2 represents a stirring extraction module; 201 represents a pot device; 201-1 represents a pot body; 201-2 represents a mounting buckle; 201-3 represents a liquid outlet; 202 represents a homogenizing stirring device; 202-1 represents a homogenizing stirring transmission device; 202-2 represents a homogenizing stirring shaft; 202-3 represents a homogenizing stirring motor; 202-4 represents a homogenizing stirring drive wheel; 202-5 represents a homogenizing stirring conveyor belt; 202-6 represents a homogenizing stirring driven wheel; 203 represents a wall-scraping stirring device; 203-1 represents a wall-scraping stirring... The mixing drive unit includes: 203-2 (wall-scraping stirring shaft), 203-2-1 (wall-scraping stirring shaft rotation shaft), 203-2-2 (stirring blade), 203-2-3 (main structure of the wall-scraping stirring device), 203-2-4 (bottom scraper), 203-3 (wall-scraping stirring motor), 203-4 (wall-scraping stirring drive wheel), 203-5 (wall-scraping stirring conveyor belt), and 203-6 (wall-scraping stirring driven wheel); 3 represents the pressure filtration module; 301 represents the industrial syringe mechanism; 301-1 represents the syringe plunger; 301-2 represents the syringe housing; 301-3 represents the syringe mounting base; 302 represents the drive mechanism; 302-1 represents the limiting platform; 302-2 represents the pressure pushing platform; 302-3 represents the pushing screw; 302-4 represents the hydraulic rod motor; and 302-5 represents the hydraulic rod. 303-1 represents a millimeter-level filter layer, 303-2 represents a micron-level filter layer, and 303-3 represents a nanometer-level filter layer; 4 represents a control mechanism, 401 represents a control system assembly, 402 represents an emergency stop button, and 403 represents a control panel; 5 represents a flow guide pipe; 6 represents a flow detection system, 601 represents a first flow sensor, 602 represents a second flow sensor, and 603 represents a third flow sensor.

[0044] Example 1

[0045] like Figure 1 , Figure 2As shown, this embodiment provides a RAP asphalt mixture asphalt extraction device, comprising an integrated frame 1, a stirring extraction module 2, a pressure filtration module 3, a control mechanism 4, and a flow detection system 6. The integrated frame 1 is a one-piece welded stainless steel structure with a polished surface for easy cleaning and to prevent residual liquid from corroding the frame. The one-piece welded structure ensures the overall stability and strength of the device during operation. The stirring extraction module 2 and the pressure filtration module 3 are sequentially installed on the integrated frame 1 along the material flow direction. The outlet of the stirring extraction module 2 is connected to the inlet of the pressure filtration module 3 via a corrosion-resistant guide pipe 5. The guide pipe 5 is made of a corrosion-resistant material suitable for organic solvents such as trichloroethylene, ensuring the service life and safety of the device. The control mechanism 4 is installed on the integrated frame 1 and connected to both the stirring extraction module 2 and the pressure filtration module 3, enabling centralized control and management of each module. The flow detection system 6 is installed on the guide pipe 5 and works in conjunction with the control mechanism 4 to achieve real-time detection and visualization of the liquid flow rate. The entire device achieves integrated and automated extraction of asphalt from RAP asphalt mixtures. The modules are connected by a guide pipe 5, eliminating the need for manual intervention in solution transfer and reducing solvent evaporation and operational errors.

[0046] like Figure 3 As shown, the integrated frame 1 includes an extraction stirring frame 101 and a pressure filtration frame 102. The extraction stirring frame 101 includes an extraction stirring pot main body frame 101-1, a buckle 101-2, and a stirring extraction transmission frame 101-3. The extraction stirring pot main body frame 101-1 is a stainless steel welded support frame used to support the stirring pot body. The buckle 101-2 is fixed to the extraction stirring pot main body frame 101-1 to limit and fix the stirring pot body, preventing it from shaking during stirring. The stirring extraction transmission frame 101-3 is used to install the stirring motor and transmission device. The pressure filtration frame 102 has three stations for installing a three-stage series industrial injector assembly. The arrangement of the three stations ensures smooth series connection between the three industrial injector assemblies. The integrated welded structure of the integrated frame 1 ensures the overall stability and strength of the device, and the fixed positional relationship of each module on the frame ensures smooth material flow.

[0047] like Figure 4 , Figure 5As shown, the stirring extraction module 2 includes a pot device 201, a homogenizing stirring device 202, and a wall-scraping stirring device 203. The pot device 201 includes a pot body 201-1, a mounting clip 201-2, and a liquid outlet 201-3. The pot body 201-1 is made of stainless steel and has good corrosion resistance. The mounting clip 201-2 is used to fix the pot body 201-1 onto the extraction stirring table 101. The liquid outlet 201-3 is located at the bottom of the pot body 201-1 and is used to regulate the outflow rate of the liquid. The liquid outlet 201-3 is connected to the guide pipe 5 via a liquid outlet pipe, and then to the pressure filtration module 3. The homogenizing stirring device 202 includes a homogenizing stirring drive 202-1, a homogenizing stirring shaft 202-2, a homogenizing stirring motor 202-3, a homogenizing stirring drive wheel 202-4, a homogenizing stirring conveyor belt 202-5, and a homogenizing stirring driven wheel 202-6. The homogenizing stirring motor 202-3 is fixedly installed on the stirring extraction transmission frame 101-3. The output shaft of the homogenizing stirring motor 202-3 is sequentially connected to the homogenizing stirring shaft 202-2 via the homogenizing stirring drive wheel 202-4, the homogenizing stirring conveyor belt 202-5, and the homogenizing stirring driven wheel 202-6. The homogenizing stirring shaft 202-2 is coaxially rotatably mounted inside the pot body 201-1. Homogenizing stirring blades are fixedly connected to the homogenizing stirring shaft 202-2. The homogenizing stirring blades rotate within the pot body 201-1, achieving overall mixing of the liquid within the pot body 201-1. The conveyor belt drive system is simple and reliable in structure, easy to install and maintain, and the transmission ratio can be adjusted by replacing the drive wheels.

[0048] The wall-scraping stirring device 203 includes a wall-scraping stirring drive 203-1, a wall-scraping stirring shaft 203-2, a wall-scraping stirring motor 203-3, a wall-scraping stirring drive wheel 203-4, a wall-scraping stirring conveyor belt 203-5, and a wall-scraping stirring driven wheel 203-6. The wall-scraping stirring motor 203-3 is fixedly mounted on the stirring extraction transmission platform 101-3. The output shaft of the wall-scraping stirring motor 203-3 is sequentially connected to the wall-scraping stirring shaft 203-2 via the wall-scraping stirring drive wheel 203-4, the wall-scraping stirring conveyor belt 203-5, and the wall-scraping stirring driven wheel 203-6. The wall-scraping stirring shaft 203-2 is coaxially rotatable within the pot body 201-1. Wall-scraping stirring blades are fixedly connected to the wall-scraping stirring shaft 203-2, and the wall-scraping stirring blades are uniformly welded along the circumference of the inner wall of the pot body 201-1. Figure 9As shown, the wall-scraping stirring shaft 203-2 of the wall-scraping stirring device 203 includes a rotating shaft 203-2-1, a main structure 203-2-3, stirring blades 203-2-2, and a bottom scraper 203-2-4. The rotating shaft 203-2-1 is the central transmission component, and the main structure 203-2-3 serves as a connecting frame, integrating the rotating shaft 203-2-1, stirring blades 203-2-2, and bottom scraper 203-2-4 into a single unit. Three independent stirring blades 203-2-2 are fitted along the inner wall of the vessel. The three stirring blades 203-2-2 are staggered along the vertical height of the stirring tank, positioned at different height levels. The outer edges of the blades are always in close contact with the entire inner surface of the stirring tank wall. When rotating synchronously with the stirring mechanism, they can scrape the entire wall of the stirring tank layer by layer from top to bottom, preventing material from sticking to the wall and clumping together. A bottom scraper 203-2-4 is installed on the inner bottom of the mixing tank. The scraper 203-2-4 fits snugly against the bottom surface of the mixing tank, effectively scraping away any sediment or residue formed by the RAP aggregate and organic solvent adhering to the bottom of the tank, preventing sedimentation, accumulation, and adhesion. Two drive components, the homogenizing agitator 202 and the wall-scraping agitator 203, operate in parallel. Both the wall-scraping and homogenizing agitators rotate at low speeds, which can be infinitely adjusted via the control mechanism 4. The homogenizing agitator rotates within the pot body 201-1 to achieve overall mixing, while the wall-scraping agitator rotates along the inner wall of the pot body 201-1 to prevent material deposition on the bottom and walls. The synergistic effect of these two agitation methods increases the contact area between the RAP aggregate and the solvent, allowing the composite solvent to fully integrate with the asphalt, separating the asphalt from the aggregate, and ensuring complete extraction.

[0049] like Figure 6 , Figure 7As shown, the pressurized filtration module 3 includes an industrial syringe mechanism 301, a drive mechanism 302, and a three-stage filtration unit. The industrial syringe mechanism 301 includes a syringe plunger 301-1, a syringe housing 301-2, and a syringe holder 301-3. The syringe housing 301-2 is made of corrosion-resistant polypropylene. The syringe plunger 301-1 has a fluororubber sealing piston at its end, which seals against the inner wall of the syringe housing 301-2 to prevent leakage of the liquid during pressurization and ensure filtration efficiency. The syringe holder 301-3 is used to fix the industrial syringe onto the pressurized filtration platform 102, ensuring the syringe's position is stable during pressurization. The three-stage filtration unit consists of a first industrial syringe, a second industrial syringe, and a third industrial syringe connected in series. The first industrial injector contains a millimeter-level filter layer 303-1, which includes three layers of stainless steel millimeter-level filter screens to trap coarse mineral impurities. The second industrial injector contains a micron-level filter layer 303-2, which includes a polytetrafluoroethylene micron-level filter membrane to trap fine particles. The third industrial injector contains a nanometer-level filter layer 303-3, which includes a nanometer-level filter medium for deep purification of the asphalt solution. This three-stage series industrial injector filtration system achieves gradient filtration from coarse to fine through progressively smaller filtration precision. Each filter layer traps impurities within its corresponding particle size range, effectively removing various mineral impurities from the feed solution. The purity of the extracted asphalt sample meets testing requirements, ensuring the accuracy of subsequent performance testing.

[0050] The drive mechanism 302 includes a propulsion component and a limit stage 302-1.

[0051] The hydraulic rod 302-5 is located between the limiting platform 302-1 and the pressurizing propulsion platform 302-2.

[0052] The propulsion assembly includes a hydraulic rod 302-5, a hydraulic rod motor 302-4, a propulsion screw 302-3, and a pressurized propulsion platform 302-2. The hydraulic rod 302-5 has a variable length and includes an inner section and an outer section. The inner section of the hydraulic rod 302-5 is connected to the hydraulic rod motor 302-4. The fixed end of the inner section of the hydraulic rod 302-5 and the base of the hydraulic rod motor 302-4 are both mounted on a limiting platform 302-1. The outer section of the hydraulic rod 302-5, the pressurized propulsion platform 302-2, and the plunger 301-1 of the industrial syringe are fixedly connected from top to bottom as a single unit. The limiting platform 302-1 is fixed to the top end of the propulsion screw 302-3, the syringe fixing seat 301-3 is fixed to the bottom end of the propulsion screw 302-3, and the pressurized propulsion platform 302-2 is slidably connected to the propulsion screw 302-3.

[0053] Three pressurizing propulsion platforms 302-2 are respectively fixedly connected to the syringe plungers 301-1 of three industrial syringes, and are used to sequentially push the syringe plungers 301-1 of the three industrial syringes to complete the pressurized filtration operation. A hydraulic rod motor 302-4 drives the hydraulic rod 302-5 to extend and retract. The hydraulic rod 302-5 pushes the pressurizing propulsion platforms 302-2 vertically along the push screw 302-3. The three pressurizing propulsion platforms 302-2 sequentially drive the syringe plungers 301-1 of the first, second, and third industrial syringes, applying adjustable pressure to the liquid inside the syringes. This external pressure accelerates the liquid's passage through the filter layer, improving filtration efficiency and meeting the needs of batch testing in the laboratory. A filtration outlet is located at the bottom of the filtration unit, through which the clarified filtrate flows into an external collection container.

[0054] like Figure 8 As shown, the flow detection system 6 includes a first flow sensor 601, a second flow sensor 602, and a third flow sensor 603, as well as a data transmission module. The first flow sensor 601, the second flow sensor 602, and the third flow sensor 603 are all turbine flow sensors. Turbine flow sensors are corrosion-resistant and resistant to interference from viscous media, making them suitable for working environments involving asphalt extract and organic solvents. All three flow sensors are installed in the middle of the guide pipe 5, and are used to detect the flow rate of the liquid at the outlet of the stirring extraction module 2, the inlet of the pressurized filtration module 3, and the outlet of the pressurized filtration module 3, respectively. The data transmission module uses a wired transmission method to ensure the stability and real-time performance of the flow data transmission. The three flow sensors are electrically connected to the control system assembly 401 of the control mechanism 4 through the data transmission module, transmitting real-time flow data to the control system assembly 401 for processing.

[0055] like Figure 8As shown, the control mechanism 4 includes a control system assembly 401, an emergency stop button 402, and a control operation panel 403. The control system assembly 401 includes a central processing unit (CPU), which controls the start and stop of the homogenizing stirring motor 202-3, the wall-scraping stirring motor 203-3, and the hydraulic rod motor 302-4 via relays. The input terminals of the control system assembly 401 are connected to the data transmission module of the flow detection system 6 and the control operation panel 403. The output terminals of the control system assembly 401 are connected to the homogenizing stirring motor 202-3, the wall-scraping stirring motor 203-3, and the hydraulic rod motor 302-4 via relays. The control operation panel 403 includes a touch display panel, which is used to set extraction speed, extraction time, filtration pressure, and heating temperature parameters. It can intuitively display the operating parameters and working status of each module, and also supports manual setting of process parameters such as extraction speed, extraction time, and filtration pressure, making operation convenient. The control panel 403 features a flow visualization display area for real-time display of feed liquid flow data. Operators can intuitively monitor the operating status of the extraction and filtration processes and promptly detect abnormalities such as pipeline blockages and leaks. The emergency stop button 402 is used to quickly stop the device in emergencies, ensuring operational safety. The control mechanism 4 enables centralized control and management of the stirring extraction module 2 and the pressurized filtration module 3, improving the automation level of the device.

[0056] The working principle of the RAP asphalt mixture asphalt extraction device in this embodiment is as follows:

[0057] During the device commissioning phase, first turn on the power switch on the control mechanism 4 to enter the operation interface. Set parameters such as extraction speed, extraction time, filtration pressure, and heating temperature through the control panel 403, and the device will enter the standby state. At the same time, set the flow threshold, start the flow detection system 6, and check the working status of the first flow sensor 601, the second flow sensor 602, and the third flow sensor 603 to ensure that the flow data transmission is normal. The device will then enter the standby state.

[0058] During the feeding and solvent addition stage, the pre-crushed RAP asphalt mixture is slowly fed into the pot 201-1. After feeding is completed, trichloroethylene organic solvent is injected into the pot 201-1, with the amount of solvent being sufficient to cover the RAP asphalt mixture, in preparation for starting the extraction.

[0059] During the stirring and extraction stage, the homogenizing stirring motor 202-3 and the wall-scraping stirring motor 203-3 are started. The homogenizing stirring motor 202-3 drives the homogenizing stirring shaft 202-2 to rotate via the homogenizing stirring conveyor belt 202-5. The homogenizing stirring blades on the homogenizing stirring shaft 202-2 rotate at a set speed in the pot body 201-1 to achieve overall mixing. The wall-scraping stirring motor 203-3 drives the wall-scraping stirring shaft 203-2 to rotate via the wall-scraping stirring conveyor belt 203-5. The stirring blades 203-2-2 on the wall-scraping stirring shaft 203-2 rotate along the inner wall of the pot body 201-1, causing the RAP material and trichloroethylene organic solvent to tumble and stir, preventing the material from settling at the bottom of the pot. The bottom scraper 203-2-4 simultaneously scrapes away the mixed liquid material settled at the bottom of the pot, ensuring that the liquid is fully mixed and dissolved. The dual stirring system works synergistically to increase the contact area between the RAP material and the organic solvent, allowing the composite solvent to fully integrate with the asphalt, thus separating the asphalt from the aggregate and improving extraction efficiency. The extraction process runs automatically according to a set time. After the set time is reached, the control mechanism 4 automatically stops the homogenizing stirring motor 202-3 and the wall scraping stirring motor 203-3, completing the stirring extraction process. During this stage, the first flow sensor 601 is in standby mode. Once the liquid outlet 201-3 opens, it begins to detect the liquid flow rate in real time and transmits the data to the control mechanism 4.

[0060] During the pressure filtration stage, after the stirring extraction process is completed, the liquid outlet 201-3 at the bottom of the pot 201-1 is opened. Under the action of gravity, the extract flows into the first industrial injector of the pressure filtration module 3 through the guide pipe 5. At this time, the first flow sensor 601 begins to collect the inlet flow rate data of the guide pipe 5 in real time, and transmits it to the control system assembly 401 through the data transmission module. The flow visualization display area of ​​the control panel 403 displays the inlet flow rate in real time. The hydraulic rod motor 302-4 is started, and the hydraulic rod motor 302-4 drives the hydraulic rod 302-5 to extend and retract. The hydraulic rod 302-5 pushes the pressure propulsion platform 302-2 to move vertically along the propulsion screw 302-3. The three pressure propulsion platforms 302-2 sequentially press down the plungers 301-1 of the first industrial injector, the second industrial injector, and the third industrial injector. The sealing piston at the end of plunger 301-1 seals against the inner wall of syringe housing 301-2. By applying pressure to the liquid inside the syringe, the liquid flows through a series of filters: millimeter-level filter layer 303-1, micrometer-level filter layer 303-2, and nanometer-level filter layer 303-3. The liquid first enters the first industrial syringe. Passing through millimeter-level filter layer 303-1, the three layers of stainless steel millimeter-level filter screen trap coarse mineral impurities, and the filtered liquid flows into the second industrial syringe. Passing through micrometer-level filter layer 303-2, the polytetrafluoroethylene micrometer-level filter membrane traps fine particles, and the filtered liquid flows into the third industrial syringe. Passing through nanometer-level filter layer 303-3, the nanometer-level filter medium deeply purifies the asphalt solution, removing residual minute impurities. Through this three-stage gradient filtration, various mineral impurities in the liquid are removed step by step, achieving pressurized purification and filtration of the asphalt solution. The filtered liquid flows out from the outlet of the pressure filtration module 3. The second flow sensor 602 collects the outflow data in real time, and the third flow sensor 603 monitors the outlet of the pressure filtration module 3. The three sets of flow data are transmitted synchronously to the control system assembly 401. The flow visualization display area simultaneously displays the inflow and outflow flow data and their change curves. Operators can judge the operating status and blockage of the filtration module by the difference between the inflow and outflow data. If the flow data exceeds the preset threshold, the control panel 403 issues an audible and visual alarm, allowing operators to troubleshoot the problem promptly. The filtered clarified filtrate flows into an external collection container through the filtration outlet at the bottom of the filtration unit.

[0061] During the collection phase, the filtered solution is collected in a container for subsequent evaporation treatment, which yields pure asphalt. During this phase, the flow detection system 6 operates continuously until the liquid has completely flowed out, recording the flow data throughout the filtration process for subsequent analysis of filtration efficiency.

[0062] During the reset and cleaning phase, the equipment is shut down, and the filter assembly and mixing tank are cleaned. After the liquid in the syringe is filtered, any trapped impurities can be removed by disassembling the syringe assembly during subsequent cleaning. The control system assembly 401 shuts down the flow detection system 6 via the control operation panel 403, and exports the flow data of this extraction process via the control operation panel 403 for archiving and future reference. Then, the three flow sensors are simply cleaned to prevent liquid residue from affecting the accuracy of the next detection.

[0063] Using the above technical solution, the RAP asphalt mixture asphalt extraction device in this embodiment has the following technical effects: The integrated frame 1 integrates the core processes of stirring extraction and pressure filtration on the same frame, and the modules are connected by the guide pipe 5, realizing the full automation of the process from feeding to filtration, effectively reducing errors caused by manual operation and solvent evaporation, and ensuring the stability and repeatability of the extraction process; The three-stage series industrial syringe filtration system effectively removes various mineral impurities in the feed liquid through the step-by-step filtration of the millimeter-level filter layer 303-1, the micron-level filter layer 303-2, and the nano-level filter layer 303-3, and the purity of the extracted asphalt sample meets the testing requirements, providing test specimens for subsequent performance testing of aged asphalt in RAP materials; The hydraulic rod 302-5 adds... The pressurized pusher 302-2 on the pusher screw 302-3 pushes the syringe plunger 301-1 for pressurized filtration. The external pressure accelerates the filtration process of the liquid, improving filtration efficiency and meeting the needs of batch testing in the laboratory. The homogenizing stirring device 202 and the wall-scraping stirring device 203 work together to increase the contact area between the RAP material and the organic solvent, preventing material sedimentation and ensuring that the liquid is fully mixed and dissolved, thus improving extraction efficiency. The flow detection system 6 realizes real-time detection and data visualization of the liquid flow rate. Operators can intuitively grasp the operating status of the extraction and filtration processes, promptly detect abnormalities such as pipeline blockage and leakage, control the flow rate of the filtered liquid, avoid liquid backflow during the filtration process, and improve the intelligence level of the device.

Claims

1. A RAP asphalt mixture asphalt extraction device, comprising an integrated frame (1), wherein the frame (1) is provided with a stirring extraction module (2) and a filtration module, wherein the liquid outlet of the stirring extraction module (2) is connected to the liquid inlet of the filtration module through a guide pipe (5), characterized in that, The filter module is a pressurized filter module (3), which includes three industrial syringe assemblies connected in series. Each industrial syringe assembly is equipped with filter plates of different filtration precisions. The pressurized filter module (3) also includes a propulsion assembly, which acts on the syringe plunger (301-1) of the industrial syringe assembly.

2. The RAP asphalt mixture asphalt extraction apparatus of claim 1, wherein, The frame (1) includes an extraction stirring frame (101) and a pressure filtration frame (102); the extraction stirring frame (101) includes an extraction stirring pot main frame (101-1), a buckle (101-2), and a stirring extraction transmission frame (101-3); the pressure filtration frame (102) is provided with three workstations for installing the industrial syringe assembly.

3. The RAP asphalt mixture asphalt extraction apparatus of claim 1, wherein, The pressurized filtration module (3) includes a syringe holder (301-3), a propulsion assembly, and a three-stage filtration unit. The three-stage filtration unit is equipped with a corresponding propulsion assembly and is set on the syringe holder (301-3) at different workstations. The three-stage filtration unit is composed of a first industrial syringe, a second industrial syringe, and a third industrial syringe connected in series. The first industrial syringe is provided with a millimeter-level filtration layer (303-1), the second industrial syringe is provided with a micrometer-level filtration layer (303-2), and the third industrial syringe is provided with a nanometer-level filtration layer (303-3).

4. The RAP asphalt mixture asphalt extraction apparatus of claim 3, wherein, The propulsion assembly includes a hydraulic rod (302-5), a hydraulic rod motor (302-4), a propulsion screw (302-3), and a pressurized propulsion platform (302-2). The hydraulic rod (302-5) has a variable length and includes an inner section and an outer section; The internal section of the hydraulic rod (302-5) is connected to the hydraulic rod motor (302-4), and the fixed end of the internal section of the hydraulic rod (302-5) and the base of the hydraulic rod motor (302-4) are both installed on the limiting platform (302-1); The outer section of the hydraulic rod (302-5), the pressurized propulsion platform (302-2), and the syringe plunger (301-1) of the industrial syringe are fixedly connected as a whole from top to bottom; The limiting platform (302-1) is fixed to the top end of the push screw (302-3), the syringe fixing seat (301-3) is fixed to the bottom end of the push screw (302-3), and the pressurizing push platform (302-2) is slidably connected to the push screw (302-3).

5. The RAP asphalt mixture asphalt extraction device according to claim 4, characterized in that, The syringe plunger (301-1) is provided with a sealing piston at its end, and the sealing piston is in sealing fit with the inner wall of the syringe housing (301-2).

6. The RAP asphalt mixture asphalt extractor of claim 1, wherein, The stirring extraction module (2) includes a pot device (201), a driving component, and a liquid outlet pipeline; the pot device (201) includes a pot body (201-1), and a liquid outlet (201-3) is provided at the bottom of the pot body (201-1); the driving component is connected to the stirring blades disposed in the pot body (201-1) for driving the stirring blades to rotate; one end of the liquid outlet pipeline is connected to the liquid outlet (201-3), and the other end is connected to the guide pipeline (5).

7. The RAP asphalt mixture asphalt extraction apparatus of claim 6, wherein, The driving assembly includes a homogenizing stirring device (202) and a wall-scraping stirring device (203); the homogenizing stirring device (202) includes a homogenizing stirring motor (202-3), a homogenizing stirring shaft (202-2), and a homogenizing stirring blade, the homogenizing stirring shaft (202-2) being rotatably disposed within the pot body (201-1), and the homogenizing stirring blade being fixedly connected to the homogenizing stirring shaft (202-2); the wall-scraping stirring device (203) includes a wall-scraping stirring motor (203-3), a wall-scraping stirring shaft (203-2), and a wall-scraping stirring blade, the wall-scraping stirring shaft (203-2) being rotatably disposed within the pot body (201-1), and the wall-scraping stirring blade being fixedly connected to the wall-scraping stirring shaft (203-2).

8. The RAP asphalt mixture asphalt extraction apparatus of claim 7, wherein, The homogenizing stirring motor (202-3) is connected to the homogenizing stirring shaft (202-2) via the homogenizing stirring conveyor belt (202-5); the wall-scraping stirring motor (203-3) is connected to the wall-scraping stirring shaft (203-2) via the wall-scraping stirring conveyor belt (203-5).

9. The RAP asphalt mixture asphalt extractor of claim 1, wherein, The stand (1) is also provided with a control mechanism (4), which is connected to the stirring extraction module (2) and the pressurized filtration module (3) respectively. The control mechanism (4) includes a control system assembly (401), an emergency stop button (402) and a control operation panel (403). The control operation panel (403) is electrically connected to the control system assembly (401). The control system assembly (401) is electrically connected to each motor in the stirring extraction module (2) and the pressurized filtration module (3) respectively through relays.

10. The RAP asphalt mixture asphalt extractor of claim 1, wherein, The device also includes a control mechanism (4) and a flow detection system (6). The control mechanism (4) is connected to the stirring extraction module (2) and the pressurized filtration module (3) respectively; the control mechanism (4) includes a control system assembly (401), an emergency stop button (402) and a control operation panel (403); the control operation panel (403) is electrically connected to the control system assembly (401); the control system assembly (401) is electrically connected to each motor in the stirring extraction module (2) and the pressurized filtration module (3) respectively through relays; The flow detection system (6) includes three flow sensors and a data transmission module. The flow sensors are all installed in the middle of the guide pipe (5). The flow sensors are electrically connected to the control system assembly (401) of the control mechanism (4) through the data transmission module. The control operation panel (403) is provided with a flow visualization display area for real-time display of liquid flow data.

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