Apparatus for producing recycled asphalt mixture and method of manufacturing the same

Abstract

The application discloses a kind of production device of recycled asphalt mixture and preparation method thereof, it is related to asphalt production equipment technical field, including mixing tank, feeding assembly, feeding port, storage tank and liquid conveying assembly;Mixing tank is equipped with stirring assembly with stirring shaft and spray pipe, and is equipped with discharge pipe at bottom;Feeding assembly includes conveying cylinder, screw conveying piece and reciprocating slideable sliding cylinder and feeding pipe;Feeding port is equipped with radially extending feed opening, and both sides inclined baffle strip forms gradually narrowing feeding opening from outside to inside.Working time, feeding pipe reciprocating sweep cooperation radial gradient feeding makes material feeding quantity and stirring intensity adaptation, solid-liquid component synchronous mixing.The application can avoid material accumulation in weak stirring zone, improve mixing uniformity and mixing efficiency, realize multi-component accurate proportioning and continuous production, improve the road performance of recycled asphalt mixture, and is suitable for efficient recycling of waste asphalt pavement material.

Description

Technical Field

[0001] This invention relates to the field of asphalt production equipment technology, specifically to a production apparatus for recycled asphalt mixture and its preparation method. Background Technology

[0002] In the field of road engineering and waste pavement material recycling, the production of recycled asphalt mixtures requires the uniform mixing of various components such as recycled asphalt pavement material, new asphalt, new aggregates, and recycling agents in a specific ratio. The uniformity of this mixing directly affects the construction quality and service life of the recycled asphalt pavement. Currently, most recycled asphalt mixture mixing devices use fixed-position feeding ports for layered feeding. The material is fed into the mixing tank from the side wall or a fixed point, and then the central mixing shaft drives the mixing components to complete the mixing.

[0003] In actual production, it was found that there is a significant radial mixing intensity gradient when the mixing shaft is working: the shear force is high, the material flow rate is fast, and the dispersion and mixing effects are strong in the area near the mixing shaft axis; along the radial direction away from the mixing shaft, the mixing intensity gradually weakens, the material movement speed is slow, the shear force is small, and the mixing capacity is significantly reduced. When using a fixed feed port for layered feeding, the material is initially distributed in the outer area with weaker mixing intensity after entering the mixing box, making it difficult to quickly enter the strong mixing zone. It can only slowly move towards the center of the mixing shaft as the material accumulates, resulting in problems such as long mixing cycle, uneven component dispersion, and local agglomeration. This not only reduces production efficiency but also makes it difficult to ensure the uniformity and road performance of the recycled asphalt mixture.

[0004] In addition, the fixed feeding method cannot match the radial strength distribution law of the mixing shaft. The material stays in the weak mixing zone for too long, which easily leads to the separation of new and old materials and insufficient dispersion of recycling agent and asphalt, affecting the quality stability of recycled mixture and making it difficult to meet the needs of large-scale production of high-performance recycled asphalt pavement.

[0005] Therefore, it is necessary to provide a production apparatus and preparation method for recycled asphalt mixture to solve the above-mentioned technical problems. Summary of the Invention

[0006] To solve the above-mentioned technical problems, the present invention provides a production apparatus for recycled asphalt mixture and a preparation method thereof.

[0007] This invention provides a production apparatus for recycled asphalt mixtures, comprising: A mixing tank, which is equipped with a stirring component to accelerate the mixing of materials; The feeding assembly is located above the mixing tank and includes a conveying cylinder with a material conveying channel. The top surface of the conveying cylinder is provided with a feeding part and the bottom surface is provided with a falling opening. A spiral conveyor is provided inside the material channel. The outside of the conveying cylinder is also fitted with a sliding cylinder that can only slide back and forth along its axial direction. The bottom surface of the sliding cylinder is equipped with a feeding pipe that communicates with the falling opening. The feeding port includes a feed opening on the top surface of the mixing tank. The bottom end of the feeding pipe extends into the feed opening and can slide along its extension direction. Inclined baffles are installed on both sides of the long side of the feed opening, and a feeding port for feeding materials into the mixing tank is formed between the two inclined baffles. The width of the feeding port gradually narrows along the radial direction of the mixing tank from the side away from the stirring axis to the side closer to the stirring axis.

[0008] Furthermore, the feed opening extends radially along the mixing tank and has a length equal to that of the drop opening.

[0009] Furthermore, the spiral conveyor includes a conveying shaft rotatably mounted inside the conveying cylinder, and a spiral auger extending axially is provided on the outer wall of the conveying shaft. A conveying motor is mounted on the end face of one end of the conveying cylinder, and the drive end of the conveying motor is connected to one end of the conveying shaft.

[0010] Furthermore, it also includes a drive mechanism mounted on the conveying cylinder for driving the sliding cylinder to reciprocate. The drive mechanism includes a reciprocating lead screw rotatably mounted on one end face of the conveying cylinder. A threaded seat is threadedly connected to the reciprocating lead screw. The threaded seat is fixed to the inner wall of the sliding cylinder. The end of the conveying shaft away from the conveying motor is connected to the end of the reciprocating lead screw through a magnetic coupling.

[0011] Furthermore, it also includes a second support, which is disposed outside the mixing tank. The top surface of the second support is equipped with a storage tank for adding materials into the feeding assembly. The storage tank includes a support plate installed on the top surface of the second support. A material cylinder is installed on the top surface of the support plate. A feeding hopper is provided on the top surface of the material cylinder. A discharge port is provided on the bottom surface of the material cylinder. The discharge port is fixedly connected to the feeding part of the conveying cylinder.

[0012] Furthermore, it also includes a first support, on which the mixing tank is fixedly mounted. The mixing tank includes a tank body, and a discharge pipe is provided on the bottom surface of the tank body. A valve for controlling the opening and closing of the discharge pipe is provided on the discharge pipe.

[0013] Furthermore, the stirring assembly includes a stirring shaft rotatably mounted on the top surface of the tank. Stirring blades and a spray pipe are installed on the outer wall of the stirring shaft. The spray pipe is located above the stirring blades. A drive motor for driving the stirring shaft to rotate is also installed on the top surface of the tank. A hollow cavity is opened inside the stirring shaft, and the hollow cavity is connected to the spray pipe.

[0014] Furthermore, it also includes a liquid delivery assembly, which includes a delivery pipe with one end sealed and inserted into the hollow cavity, a delivery pump connected to the other end of the delivery pipe, and a liquid storage tank provided on the delivery pipe.

[0015] Furthermore, a plurality of feeding components are provided, and the plurality of feeding components are arranged at intervals along the circumference of the first support. The number of feeding ports is the same as the number of feeding components and corresponds one-to-one.

[0016] A method for preparing recycled asphalt mixture, characterized by comprising the following steps: S1. Material preparation: Add the solid components required for the recycled asphalt mixture to the corresponding storage tanks, and inject the liquid components such as recycling agent and lubricant into the storage tank of the liquid conveying component. S2. Synchronous feeding: Start the conveyor motor to drive the screw conveyor to operate, and transport the solid components in each storage tank to the feeding port through the conveyor cylinder, the drop opening, and the feeding pipe; at the same time, the conveyor shaft drives the reciprocating screw to rotate through the magnetic coupling, so that the sliding cylinder and the feeding pipe slide back and forth along the axial direction of the conveyor cylinder. With the structure of the feeding port gradually narrowing radially from far to near, the material is fed in a gradient from the outer periphery to the stirring axis along the radial direction of the mixing tank. S3. Stirring and mixing: Start the drive motor to drive the stirring shaft and stirring blades to rotate, and at the same time turn on the delivery pump to spray the liquid components in the storage tank into the mixing tank through the hollow cavity and spray pipe, and stir and mix them synchronously with the solid components. S4. Discharge: After the materials are evenly mixed, open the valve on the discharge pipe to discharge the finished recycled asphalt mixture. Compared with the prior art, the beneficial effects of the present invention are: 1. This invention uses a feeding assembly to drive the feeding pipe to sweep radially back and forth along the mixing tank, and in conjunction with a feeding port that gradually narrows radially from the outside to the inside, so that the amount of material fed is highly matched with the radial distribution of the mixing intensity. More material is fed into the area near the mixing axis and less material is fed into the area far from the axis, which avoids the accumulation and retention of material in the weak mixing zone from the source, significantly accelerates the material dispersion speed, shortens the mixing cycle, and greatly improves the overall uniformity and mixing quality of the recycled asphalt mixture.

[0017] 2. This invention adopts an integrated structure of spiral quantitative feeding, magnetic coupling transmission, reciprocating sweeping feeding and central spraying and mixing. Multiple sets of feeding components provide circumferential synchronous feeding and synchronous mixing of solid and liquid components. The overall transmission is simple and the operation is stable. It can achieve gradient precise feeding without the need for additional drive components, effectively reducing equipment energy consumption and failure rate, meeting the needs of continuous and large-scale production of recycled asphalt mixtures, and has stronger practicality and versatility. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the mixing tank in this invention; Figure 3 This is a schematic cross-sectional view of the mixing tank in this invention; Figure 4 This is a front view schematic diagram of the storage tank and the feeding assembly in this invention; Figure 5 This is a side view of the storage tank and the feeding assembly in this invention. Figure 6 for Figure 4 A schematic diagram of the cross-sectional structure.

[0019] The diagram is labeled as follows: 1. First support; 2. Mixing tank; 21. Tank body; 22. Drive motor; 23. Stirring shaft; 24. Stirring blade; 25. Hollow cavity; 26. Spray pipe; 27. Discharge pipe; 3. Second support; 4. Storage tank; 41. Support plate; 42. Material cylinder; 43. Feeding hopper; 44. Drop port; 5. Feeding assembly; 51. Conveying cylinder; 52. Conveying motor; 53. Sliding cylinder; 54. Feeding pipe; 55. Reciprocating screw; 56. Threaded seat; 57. Conveying shaft; 58. Spiral auger; 59. Drop opening; 6. Feeding port; 61. Feed inlet; 62. Inclined baffle; 63. Feeding port; 7. Liquid conveying assembly; 71. Conveying pump; 72. Conveying pipe; 73. Storage tank. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0021] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0022] Please see Figures 1-6 The present invention provides a technical solution: a production apparatus for recycled asphalt mixture, comprising... Mixing tank 2, which is equipped with a stirring component to accelerate the mixing of materials; The feeding assembly 5 is located above the mixing tank 2 and includes a conveying cylinder 51 with a material conveying channel. The top surface of the conveying cylinder 51 is provided with a feeding part and the bottom surface is provided with a falling opening 59. A spiral conveyor is provided inside the material channel. The outside of the conveying cylinder 51 is also fitted with a sliding cylinder 53 that can only slide back and forth along its axial direction. The bottom surface of the sliding cylinder 53 is equipped with a feeding pipe 54 that communicates with the falling opening 59. The feeding port 6 includes a feeding opening 61 opened on the top surface of the mixing tank 2. The bottom end of the feeding pipe 54 extends into the feeding opening 61 and can slide along its extension direction. Inclined baffles 62 are installed on both sides of the long side of the feeding opening 61. A feeding port 63 for feeding materials into the mixing tank is formed between the two inclined baffles 62. The width of the feeding port 63 gradually narrows along the radial direction of the mixing tank 2 from the side away from the stirring axis to the side closer to the stirring axis.

[0023] Specifically, by setting a stirring assembly inside the mixing tank 2, and a feeding assembly 5 including a conveying cylinder 51, a screw conveyor, a sliding cylinder 53, and a feeding pipe 54 above the mixing tank 2, and opening a feeding port 6 on the top surface of the mixing tank 2 consisting of a feed opening 61, an inclined baffle 62, and a feeding port 63, the feeding port 63 gradually narrows radially from the side away from the stirring axis to the side closer to the stirring axis. The sliding cylinder 53 can drive the feeding pipe 54 to slide back and forth axially along the conveying cylinder 51, and the bottom end of the feeding pipe 54 slides synchronously within the feed opening 61. This allows the amount of material fed to match the radial stirring intensity gradient, with a larger amount fed near the stirring axis and a smaller amount fed away from the axis, avoiding material accumulation in the weak stirring zone. This allows the material to be efficiently sheared and dispersed as soon as it enters the tank, greatly improving the mixing uniformity and stirring efficiency, and solving the problems of uneven mixing and long cycle time of traditional fixed feeding ports.

[0024] As a technical optimization of the present invention, the feed opening 61 extends radially along the mixing tank 2, and its length is equal to that of the drop opening 59.

[0025] Specifically, by extending the feed opening 61 radially along the mixing tank 2 and making its length equal to that of the drop opening 59, it is ensured that during the reciprocating sliding process of the feeding pipe 54, the material can stably fall from the drop opening 59 into the feed opening 61 through the feeding pipe 54, ensuring the continuity and stability of radial sweeping feeding, avoiding material overflow or feeding blind spots, and ensuring the stable implementation of gradient feeding.

[0026] As a technical optimization of the present invention, the screw conveyor includes a conveying shaft 57 rotatably installed inside the conveying cylinder 51, a spiral auger 58 extending axially on the outer wall of the conveying shaft 57, and a conveying motor 52 installed on the end face of one end of the conveying cylinder 51, the driving end of the conveying motor 52 being connected to one end of the conveying shaft 57.

[0027] Specifically, by setting a spiral conveyor consisting of a conveyor shaft 57, a spiral auger 58 and a conveyor motor 52 inside the conveyor cylinder 51, the conveyor motor 52 drives the conveyor shaft 57 and the spiral auger 58 to rotate, which can quantitatively and uniformly push solid materials, prevent material bridging and blockage, ensure stable and controllable feeding, and provide a stable material supply for gradient feeding.

[0028] As a technical optimization of the present invention, it also includes a drive mechanism disposed on the conveying cylinder 51 for driving the sliding cylinder 53 to reciprocate. The drive mechanism includes a reciprocating lead screw 55 rotatably mounted on one end face of the conveying cylinder 51. A threaded seat 56 is threadedly connected to the reciprocating lead screw 55. The threaded seat 56 is fixed to the inner wall of the sliding cylinder 53. The end of the conveying shaft 57 away from the conveying motor 52 is connected to the end of the reciprocating lead screw 55 through a magnetic coupling.

[0029] Specifically, by setting a drive mechanism consisting of a reciprocating screw 55 and a threaded seat 56 on the conveying cylinder 51, the conveying shaft 57 drives the reciprocating screw 55 to rotate through a magnetic coupling, thereby driving the sliding cylinder 53 and the feeding pipe 54 to reciprocate along the axial direction of the conveying cylinder 51. No additional drive source is required, the structure is compact and the transmission is stable, and the feeding pipe 54 can automatically reciprocate and sweep, covering the entire radial feeding area and improving the uniformity of feeding.

[0030] As a technical optimization of the present invention, it also includes a second support 3. The second support 3 is disposed outside the mixing tank 2, and a storage tank 4 for adding materials into the feeding assembly 5 is installed on its top surface. The storage tank 4 includes a support plate 41 installed on the top surface of the second support 3. A material cylinder 42 is installed on the top surface of the support plate 41. A feeding hopper 43 is provided on the top surface of the material cylinder 42. A discharge port 44 is provided on the bottom surface of the material cylinder 42. The discharge port 44 is fixedly connected to the feeding part of the conveying cylinder 51.

[0031] Specifically, by setting a second support 3 and a storage tank 4 on the outside of the mixing tank 2, the discharge port 44 of the storage tank 4 is fixedly connected to the feed section of the conveying cylinder 51, which enables the classified storage and stable supply of different solid components, realizes the synchronous feeding of multiple components, avoids material mixing, ensures the accurate proportion of recycled asphalt mixture, and improves production continuity.

[0032] As a technical optimization of the present invention, it also includes a first support 1, and a mixing tank 2 is fixedly installed on the first support 1. The mixing tank 2 includes a tank body 21, and a discharge pipe 27 is provided on the bottom surface of the tank body 21. A valve for controlling its opening and closing is provided on the discharge pipe 27.

[0033] Specifically, by setting the first bracket 1 to fix and support the mixing tank 2, and setting the discharge pipe 27 with a valve on the bottom surface of the tank body 21, the entire device can be stably supported, ensuring a smooth mixing process. At the same time, the timing of the discharge of finished materials can be easily controlled. The operation is simple, the discharge is smooth, and it meets the needs of industrial production.

[0034] As a technical optimization of the present invention, the stirring assembly includes a stirring shaft 23 rotatably mounted on the top surface of the tank 21. A stirring blade 24 and a spray pipe 26 are installed on the outer wall of the stirring shaft 23. The spray pipe 26 is located above the stirring blade 24. A drive motor 22 for driving the stirring shaft 23 to rotate is also installed on the top surface of the tank 21. A hollow cavity 25 is opened inside the stirring shaft 23, and the hollow cavity 25 is connected to the spray pipe 26.

[0035] Specifically, by setting a mixing assembly consisting of a drive motor 22, a mixing shaft 23, a mixing blade 24, a spray pipe 26, and a hollow cavity 25 on the tank body 21, with the spray pipe 26 positioned above the mixing blade 24, the liquid components can be evenly sprayed from the hollow cavity 25 to the surface of the solid material through the spray pipe 26 while mixing, thereby achieving synchronous mixing of solid and liquid materials, improving the bonding effect and mixing uniformity, and optimizing the road performance of recycled asphalt mixture.

[0036] As a technical optimization of the present invention, it also includes a liquid delivery assembly 7, which includes a delivery pipe 72 with one end sealed and inserted into the hollow cavity 25, a delivery pump 71 connected to the other end of the delivery pipe 72, and a liquid storage tank 73 provided on the delivery pipe 72.

[0037] Specifically, by setting up a liquid conveying assembly 7 that includes a conveying pump 71, a conveying pipe 72 and a liquid storage tank 73, the conveying pipe 72 is sealed and inserted into the hollow cavity 25 of the stirring shaft 23, which can stably convey liquid components such as regenerator and asphalt, ensure stable liquid supply pressure and flow, and the sealed connection structure can prevent liquid leakage and ensure that the liquid is accurately sprayed into the material.

[0038] As a technical optimization of the present invention, a plurality of feeding components 5 are provided, and the plurality of feeding components 5 are arranged at intervals along the circumference of the first support 1. The number of feeding ports 6 is the same as the number of feeding components 5 and corresponds one-to-one.

[0039] Specifically, by setting up several feeding components 5 arranged at intervals along the circumference of the first support 1, and ensuring that the number of feeding ports 6 and the feeding components 5 are the same and correspond one-to-one, it is possible to achieve simultaneous feeding of multiple components and multiple directions, further shorten the mixing time, enable each component to be quickly and evenly distributed in the tank, and improve production efficiency and overall uniformity of the mixture.

[0040] A method for preparing recycled asphalt mixture includes the following steps: S1. Material preparation: Add the solid components required for the recycled asphalt mixture to the corresponding storage tanks 4, and inject the liquid components such as recycling agent and lubricant into the storage tank 73 of the liquid conveying component 7. S2. Synchronous feeding: Start the conveyor motor 52 to drive the screw conveyor to operate, and transport the solid components in each storage tank 4 to the feeding port 6 through the conveyor cylinder 51, the drop opening 59, and the feeding pipe 54; at the same time, the conveyor shaft 57 drives the reciprocating screw 55 to rotate through the magnetic coupling, so that the sliding cylinder 53 and the feeding pipe 54 slide back and forth along the axial direction of the conveyor cylinder 51. With the structure of the feeding port 63 gradually narrowing radially from far to near, the material is fed in a gradient from the outer periphery to the stirring axis along the radial direction of the mixing tank 2. S3. Stirring and mixing: Start the drive motor 22 to drive the stirring shaft 23 and stirring blades 24 to rotate. At the same time, turn on the delivery pump 71 to spray the liquid components in the liquid storage tank 73 into the mixing tank 2 through the hollow cavity 25 and spray pipe 26, and stir and mix them synchronously with the solid components. S4. Discharge: After the materials are mixed evenly, open the valve on the discharge pipe 27 to discharge the finished recycled asphalt mixture.

[0041] Specifically, through the coordinated steps of material preparation, synchronous feeding, mixing and discharging, solid components are fed radially into mixing tank 2 via storage tank 4, feeding component 5 and feeding port 6, while liquid components are synchronously sprayed and mixed via liquid conveying component 7 and spray pipe 26. Finally, the finished product is discharged through discharge pipe 27. This process enables precise matching of material feeding and mixing intensity, synchronous mixing of solid and liquid components, a simple process with strong controllability, and significantly improves the mixing quality and production efficiency of recycled asphalt mixtures, making it suitable for large-scale continuous production.

[0042] When this device is in operation, the solid components required for the recycled asphalt pavement, new aggregate, and mineral powder are first placed into the corresponding storage tank 4's cylinder 42. Each solid component enters the feeding section of the conveying cylinder 51 in the feeding assembly 5 through the discharge port 44 at the bottom of the cylinder 42. The liquid components such as recycling agent and asphalt are injected into the liquid storage tank 73 of the liquid conveying assembly 7 to complete the material preparation. The conveying motor 52 is started, driving the conveying shaft 57 and the screw conveyor 58 to rotate, pushing the solid material in the conveying cylinder 51 along the conveying channel to the drop opening 59, and then entering the feeding pipe 54 at the bottom of the sliding cylinder 53 through the drop opening 59. At the same time, the conveying shaft 57 drives the reciprocating screw 55 to rotate through the magnetic coupling, causing the threaded seat 56 to drive the sliding cylinder 53 and the feeding pipe 54 to slide back and forth along the axial direction of the conveying cylinder 51. The bottom end of the feeding pipe 54 slides synchronously in the feeding opening 61 at the top of the mixing tank 2, realizing continuous sweeping feeding along the radial direction of the mixing tank 2. Material falls through feeding pipe 54 into feeding port 63, formed by inclined baffles 62 on both sides of feeding opening 61. Feeding port 63 gradually narrows radially along mixing tank 2 from the side furthest from the mixing axis to the side closer to the mixing axis, so that the material feeding flow rate matches the radial mixing intensity gradient. The feeding amount is large in the area closer to the mixing axis and small in the area farther from the axis, so that the material is in the high-efficiency mixing zone as soon as it enters the tank, and is quickly dispersed and mixed. The drive motor 22 is started to drive the mixing shaft 23 and mixing blades 24 to rotate, forcibly mixing the material in the tank; at the same time, the delivery pump 71 is turned on, and the liquid components in the liquid storage tank 73 are sent through delivery pipe 72 into the hollow cavity 25 inside the mixing shaft 23, and then sprayed evenly onto the material through spray pipe 26, so that the liquid components and solid components are mixed synchronously and thoroughly. After the material is evenly mixed, the valve on the discharge pipe 27 at the bottom of the tank 21 is opened to discharge the finished recycled asphalt mixture, completing the entire production process.

Claims

1. A production apparatus for recycled asphalt mixture, characterized in that, include The mixing tank (2) is equipped with a stirring component that accelerates the mixing of materials. The feeding assembly (5) is located above the mixing tank (2) and includes a conveying cylinder (51) with a material conveying channel. The top surface of the conveying cylinder (51) is provided with a feeding part and the bottom surface is provided with a falling opening (59). A spiral conveying component is provided inside the material channel. The outside of the conveying cylinder (51) is also fitted with a sliding cylinder (53) that can only slide back and forth along its axial direction. The bottom surface of the sliding cylinder (53) is equipped with a feeding pipe (54) that communicates with the falling opening (59). The feeding port (6) includes a feeding opening (61) opened on the top surface of the mixing tank (2). The bottom end of the feeding pipe (54) extends into the feeding opening (61) and can slide along its extension direction. Inclined baffles (62) are installed on both sides of the long side of the feeding opening (61). A feeding port (63) for feeding materials into the mixing tank is formed between the two inclined baffles (62). The width of the feeding port (63) gradually narrows along the radial direction of the mixing tank (2) from the side away from the stirring axis to the side closer to the stirring axis.

2. The apparatus for producing recycled asphalt mixture as described in claim 1, characterized in that: The feed opening (61) extends radially along the mixing tank (2) and has a length equal to that of the drop opening (59).

3. The apparatus for producing recycled asphalt mixture as described in claim 1, characterized in that: The spiral conveyor includes a conveying shaft (57) rotatably mounted inside the conveying cylinder (51). A spiral auger (58) extending axially is provided on the outer wall of the conveying shaft (57). A conveying motor (52) is mounted on the end face of one end of the conveying cylinder (51). The driving end of the conveying motor (52) is connected to one end of the conveying shaft (57).

4. The apparatus for producing recycled asphalt mixture as described in claim 3, characterized in that: It also includes a drive mechanism set on the conveying cylinder (51) for driving the sliding cylinder (53) to reciprocate. The drive mechanism includes a reciprocating screw (55) rotatably mounted on one end face of the conveying cylinder (51). A threaded seat (56) is threadedly connected to the reciprocating screw (55). The threaded seat (56) is fixed to the inner wall of the sliding cylinder (53). The end of the conveying shaft (57) away from the conveying motor (52) is connected to the end of the reciprocating screw (55) through a magnetic coupling.

5. The apparatus for producing recycled asphalt mixture as described in claim 1, characterized in that: It also includes a second support (3), which is located outside the mixing tank (2). The top surface of the second support (3) is equipped with a storage tank (4) for adding materials into the feeding assembly (5). The storage tank (4) includes a support plate (41) installed on the top surface of the second support (3). A material cylinder (42) is installed on the top surface of the support plate (41). A feeding hopper (43) is provided on the top surface of the material cylinder (42). A discharge port (44) is provided on the bottom surface of the material cylinder (42). The discharge port (44) is fixedly connected to the feeding part of the conveying cylinder (51).

6. The apparatus for producing recycled asphalt mixture as described in claim 1, characterized in that: It also includes a first support (1), the mixing tank (2) is fixedly installed on the first support (1), the mixing tank (2) includes a tank body (21), the bottom surface of the tank body (21) is provided with a discharge pipe (27), and the discharge pipe (27) is provided with a valve to control its opening and closing.

7. The apparatus for producing recycled asphalt mixture as described in claim 6, characterized in that: The stirring assembly includes a stirring shaft (23) rotatably mounted on the top surface of the tank (21). Stirring blades (24) and a spray pipe (26) are installed on the outer wall of the stirring shaft (23). The spray pipe (26) is located above the stirring blades (24). A drive motor (22) for driving the stirring shaft (23) to rotate is also installed on the top surface of the tank (21). A hollow cavity (25) is opened inside the stirring shaft (23), and the hollow cavity (25) is connected to the spray pipe (26).

8. The apparatus for producing recycled asphalt mixture as described in claim 7, characterized in that: It also includes a liquid delivery assembly (7), which includes a delivery pipe (72) with one end sealed and inserted into the hollow cavity (25), and a delivery pump (71) connected to the other end of the delivery pipe (72). A liquid storage tank (73) is also provided on the delivery pipe (72).

9. The apparatus for producing recycled asphalt mixture as described in claim 6, characterized in that: The feeding components (5) are provided in a plurality of them, and the plurality of feeding components (5) are arranged at intervals along the circumference of the first support (1). The number of feeding ports (6) is the same as the number of feeding components (5) and corresponds one to one.

10. A method for preparing recycled asphalt mixture using the production apparatus of claim 8, characterized in that, Includes the following steps: S1. Material preparation: Add the solid components required for the recycled asphalt mixture to the corresponding storage tank (4), and inject the liquid components such as recycling agent and lubricant into the storage tank (73) of the liquid conveying component (7); S2, Synchronous feeding: Start the conveyor motor (52) to drive the screw conveyor to operate and transport the solid components in each storage tank (4) to the feeding port (6) through the conveyor cylinder (51), the drop opening (59), and the feeding pipe (54); at the same time, the conveyor shaft (57) drives the reciprocating screw (55) to rotate through the magnetic coupling, so that the sliding cylinder (53) and the feeding pipe (54) slide back and forth along the axial direction of the conveyor cylinder (51), and cooperate with the structure of the feeding port (63) gradually narrowing from far to near in the radial direction, so that the material is fed in a gradient from the outside to the stirring axis in the radial direction of the mixing tank (2); S3. Stirring and mixing: Start the drive motor (22) to drive the stirring shaft (23) and stirring blade (24) to rotate, and at the same time turn on the delivery pump (71) to spray the liquid components in the storage tank (73) into the mixing tank (2) through the hollow cavity (25) and spray pipe (26) to stir and mix with the solid components synchronously. S4. Discharge: After the materials are evenly mixed, open the valve on the discharge pipe (27) to discharge the finished recycled asphalt mixture.

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