An asphalt pavement recycling mixing device

Abstract

The application discloses a kind of asphalt pavement regeneration mixing devices, comprising: base, stirring tank, main stirring rod and power source.Base is equipped with moving wheel and support pole;Stirring tank is located above base and is supported by support pole;Stirring tank is equipped with sequentially communicating feed inlet, stirring cavity and discharge port;Main stirring rod is located in stirring cavity, and main stirring rod is equipped with multiple first helical stirring blades;First helical stirring blade is equipped with scraper;The output end of power source is connected with main stirring rod by transmission member and is driven connection.Main stirring rod revolves around its axis in stirring cavity, and multiple first helical stirring blades are helically sequentially spaced around the axis of main stirring rod, and when rotating with main stirring rod, composite driving force is applied to material along axial and circumferential direction, and mixing dead zone is eliminated.Scraper revolves synchronously with main stirring rod and continuously sweeps the inner wall of stirring tank, prevents material from aging or caking due to wall adhesion, and improves material utilization and consistency of discharge composition.

Description

Technical Field

[0001] This invention relates to the field of road construction technology, and in particular to an asphalt pavement recycling mixing device. Background Technology

[0002] Asphalt pavement recycling technology is a process developed based on the need for recycling old pavement materials. Its core is to use special mixing equipment to mix recycled asphalt pavement materials with new aggregates, asphalt and recycling agents in a specific ratio in a hot or cold state to prepare recycled mixtures that meet road performance requirements.

[0003] In the asphalt pavement recycling process, improper proportions of recycled asphalt pavement materials, new aggregates, recycling agents, and new asphalt, or inadequate control of mixing process parameters, can easily lead to uneven dispersion of components and insufficient integration of old and new asphalt. This results in variations in the gradation of the recycled mixture and uneven distribution of asphalt film thickness. Such poor mixing directly leads to insufficient structural strength and reduced resistance to water damage in the recycled pavement, and significantly exacerbates early-stage defects such as high-temperature rutting, low-temperature cracking, and fatigue cracking, severely shortening the service life and long-term performance of the recycled pavement. Insufficient mixing of components directly results in poor performance of the recycled pavement. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide an asphalt pavement recycling mixing device for fully mixing the components.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] An asphalt pavement recycling mixing plant includes:

[0007] The base is equipped with casters and support rods, with the casters located below the base and multiple support rods.

[0008] A mixing tank is positioned above the base and supported by the support rod. The mixing tank has a cylindrical structure, and its axis is parallel to the horizontal plane. The mixing tank has a feed inlet, a mixing chamber, and a discharge outlet connected in sequence. The feed inlet and the discharge outlet are located at opposite ends of the mixing tank. The feed inlet is used to fill the material to be mixed, and the discharge outlet is used to discharge the mixed material.

[0009] The main stirring rod is pivotally connected to the stirring tank and located inside the stirring chamber. The main stirring rod is provided with a plurality of first spiral stirring blades, which are arranged spirally and sequentially around the axis of the main stirring rod and spaced apart. Each first spiral stirring blade is provided with a scraper, which is located at the end of the first spiral stirring blade away from the main stirring rod and is used to scrape the inner wall of the stirring tank.

[0010] A power source, the output end of which is connected to the main stirring rod via a transmission component to drive the main stirring rod to rotate.

[0011] Furthermore, the asphalt pavement recycling mixing device also includes a secondary mixing rod. The main mixing rod and the secondary mixing rod are located on opposite sides of the axis of the mixing tank. The main mixing rod is located below the secondary mixing rod. The secondary mixing rod is provided with a plurality of second spiral mixing blades, which are spirally arranged sequentially around the axis of the secondary mixing rod and spaced apart. The axes of the main mixing rod and the secondary mixing rod are both parallel to the axis of the mixing tank. The outer diameter of the first spiral mixing blade is larger than the outer diameter of the second spiral mixing blade.

[0012] Furthermore, the transmission component includes a first transmission wheel connected to the main stirring rod and a second transmission wheel connected to the auxiliary stirring rod. The first transmission wheel and the second transmission wheel have different gear ratios so that the main stirring rod and the auxiliary stirring rod rotate at different speeds.

[0013] Furthermore, the spiral direction of the first spiral stirring blade is opposite to that of the second spiral stirring blade, and the rotation directions of the main stirring rod and the auxiliary stirring rod are opposite.

[0014] Furthermore, the inner wall of the mixing tank is provided with a plurality of heating elements, which are spaced apart around the circumference of the mixing tank; a heat-conducting layer is provided on the side of the heating element near the mixing chamber so that the heat of the heating element is evenly conducted into the mixing chamber.

[0015] Furthermore, the mixing tank is provided with two heat insulation rings, which are disposed inside the mixing tank and surround the circumference of the mixing tank; the two heat insulation rings are spaced apart along the axial direction of the mixing tank, and the heat insulation rings divide the mixing chamber into a preheating zone, a mixing zone, and a heat preservation zone, which are arranged sequentially along the direction of movement of the material to be mixed; the heating element is disposed in the preheating zone and the mixing zone, and the temperature of the mixing zone is higher than the temperature of the preheating zone.

[0016] Furthermore, the arrangement density of heating elements in the stirring zone is greater than that in the preheating zone; the heating power density per unit area of ​​the heating elements located at the bottom of the stirring tank is greater than that of the heating elements located at the top of the stirring tank.

[0017] Furthermore, the heat insulation ring has a rounded corner or beveled transition with the inner wall of the mixing tank, and the heat insulation ring is made of heat insulation material.

[0018] Furthermore, the auxiliary stirring rod is provided with a liquid passage chamber, and the auxiliary stirring rod is provided with multiple liquid passage holes. The multiple liquid passage holes are spirally distributed along the axial direction of the auxiliary stirring rod, and the liquid passage holes are connected to the liquid passage chamber to form a liquid passage. The liquid passage holes are located in the stirring zone, and the liquid passage holes are used to add regenerant to the stirring zone. The pitch of the spiral distribution of the liquid passage holes along the axial direction of the auxiliary stirring rod is the same as the pitch of the second spiral stirring blade.

[0019] Furthermore, the liquid passage cavity is provided with a guide hole, an elastic element, a pressure-bearing guide element, and a sealing rod. The guide hole is a blind hole and is coaxially arranged with the liquid passage hole. The elastic element is disposed within the guide hole. The pressure-bearing guide element is fixedly connected to the sealing rod and is disposed within the guide hole and slidably connected to the guide hole. One end of the elastic element abuts against the bottom of the guide hole, and the other end of the elastic element abuts against the pressure-bearing guide element, so that the pressure-bearing guide element has a tendency to move away from the bottom of the guide hole. The sealing rod is coaxially arranged with the liquid passage hole, so that the sealing rod can move along the axial direction of the guide hole. The sealing rod is used to slide with the liquid passage hole to block or open the liquid passage hole. A conical sealing head is provided at the end of the sealing rod facing the liquid passage hole.

[0020] The sealing rod is configured such that when the liquid passage chamber is filled with regenerant and the pressure increases, the pressure-bearing guide is pressed close to the bottom of the guide hole, driving the sealing rod away from the liquid passage hole to open the liquid passage hole; when the pressure in the liquid passage chamber decreases, the pressure-bearing guide moves away from the bottom of the guide hole under the action of the elastic element, driving the sealing rod to block the liquid passage hole.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. The equipment is based on a base equipped with casters and support rods. The casters are located below the base, and multiple support rods are provided. A mixing tank is positioned above the base and supported by the support rods. The mixing tank has a cylindrical structure, and its axis is parallel to the horizontal plane. The mixing tank has a feed inlet, a mixing chamber, and a discharge outlet connected in sequence. The feed inlet and the discharge outlet are located at opposite ends of the mixing tank. The feed inlet is used to fill the material to be mixed, and the discharge outlet is used to discharge the mixed material. The base, with its casters, allows the equipment to be moved to the work position. Combined with the multiple support rods, the equipment rests against the ground when parked, providing flexible relocation mobility and reliable parking stability, effectively improving on-site deployment efficiency and operational safety. The mixing tank is supported by a support rod on the base. Its cylindrical horizontal layout with its axis parallel to the horizontal plane lowers the center of gravity of the whole machine and enhances the anti-tipping ability of the equipment during movement and operation. The feed inlet, mixing chamber and discharge outlet are connected in sequence and located at opposite ends of the mixing tank. This allows the material to move continuously along the axis towards the discharge outlet after being stirred in the mixing chamber, avoiding material retention or back mixing, and ensuring the continuity of the mixing process and the uniformity of the discharge.

[0023] 2. The main stirring rod is pivotally connected to the mixing tank and located within the mixing chamber. The main stirring rod is equipped with multiple first spiral stirring blades, which are spirally arranged sequentially around the axis of the main stirring rod and spaced apart. Each first spiral stirring blade has a scraper located at the end furthest from the main stirring rod, and the scraper is used to scrape the inner wall of the mixing tank. The main stirring rod receives rotational drive from a power source via a transmission component, rotating around its own axis within the mixing chamber, converting power into mechanical motion of the stirring element, providing a continuous and stable driving force for material mixing. The multiple first spiral stirring blades, spirally arranged sequentially and spaced apart around the axis of the main stirring rod, apply a combined axial and circumferential driving force to the material as the main stirring rod rotates. The material undergoes dispersion, compression, and mixing within each interval region, achieving macroscopic convection and microscopic diffusion of the material throughout the entire length of the mixing chamber, eliminating mixing dead zones. The scraper is located at the end of the first spiral mixing blade away from the main mixing rod. It rotates synchronously with the main mixing blade and continuously scrapes the inner wall of the mixing tank, removing the material layer adhering to the wall and reintroducing it into the mixing zone to participate in the mixing. This prevents the material from aging or clumping due to adhesion to the wall, and improves the material utilization rate and the consistency of the output composition.

[0024] 3. The output end of the power source is connected to the main stirring rod via a transmission component to drive the main stirring rod to rotate. The intermediate connection of the transmission component enables flexible or rigid dynamic coupling between the power source and the main stirring rod, transmitting torque while isolating vibration and impact, ensuring the stable operation of the main stirring rod under fluctuating load conditions, and reducing the installation accuracy requirements and operating noise of the drive system. Therefore, this mixing device achieves synergistic coordination in terms of ease of movement, stable support, homogeneous mixing, and stable operation, ensuring stable and controllable mixing quality. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the asphalt pavement recycling mixing device of the present invention;

[0026] Figure 2 for Figure 1 The sectional view shown;

[0027] Figure 3 for Figure 1 The partial sectional view shown is located at the transmission component;

[0028] Figure 4 This is a cross-sectional view of the liquid passage hole in the present invention.

[0029] In the diagram: 1. Base; 2. Casters; 3. Support rod; 4. Mixing tank; 5. Inlet; 6. Mixing chamber; 7. Outlet; 8. Main mixing rod; 9. First spiral mixing blade; 10. Scraper; 11. Transmission component; 12. Secondary mixing rod; 13. Second spiral mixing blade; 14. First transmission wheel; 15. Second transmission wheel; 16. Heating component; 17. Heat-conducting layer; 18. Insulation ring; 19. Preheating zone; 20. Mixing zone; 21. Insulation zone; 22. Liquid passage chamber; 23. Liquid passage hole; 24. Guide hole; 25. Elastic component; 26. Pressure-bearing guide component; 27. Sealing rod. Detailed Implementation

[0030] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0031] It should be noted that when an element is described as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is described as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0033] See Figures 1-4 A preferred embodiment of the present invention provides an asphalt pavement recycling mixing device, comprising: a base 1, a mixing tank 4, a main mixing rod 8, and a power source.

[0034] The base 1 is equipped with casters 2 and support rods 3. The casters 2 are located below the base 1. Multiple support rods 3 are provided. The casters 2 enable the entire device to move flexibly, allowing the operator to easily move the equipment to the target work position, significantly improving the equipment's mobility and on-site deployment efficiency, and reducing labor costs and time losses during handling. The coordinated configuration of the casters 2 and support rods 3 allows the equipment to be quickly moved while maintaining a stable support foundation during operation, balancing the dual requirements of flexible movement and stable parking, effectively improving the device's adaptability and ease of operation in different working environments.

[0035] The mixing tank 4 is positioned above the base 1 and supported by the support rods 3. The mixing tank 4 has a cylindrical structure, and its axis is parallel to the horizontal plane. The mixing tank 4 has a feed inlet 5, a mixing chamber 6, and a discharge outlet 7 connected in sequence. The feed inlet 5 and the discharge outlet 7 are located at opposite ends of the mixing tank 4. The feed inlet 5 is used to fill the material to be mixed, and the discharge outlet 7 is used to discharge the mixed material. The mixing tank 4 is fixed above the base 1 and supported by multiple support rods 3, thus obtaining a stable installation support foundation. This effectively suppresses tank vibration caused by material eccentricity or rotational excitation during mixing operation, ensuring the positional accuracy and operational stability of the mixing tank 4 during long-term use. The mixing tank 4 is designed as a cylindrical structure with its axis parallel to the horizontal plane. This horizontal layout lowers the overall center of gravity, helps improve the anti-tipping ability of the equipment during movement or operation, and facilitates the axial flow and tumbling of materials within the tank. The feed inlet 5, the mixing chamber 6, and the discharge outlet 7 are connected in sequence. The feed inlet 5 and the discharge outlet 7 are located at opposite ends of the mixing tank 4. After the material to be mixed is put into the mixing tank through the feed inlet 5, it moves along the axis of the mixing chamber 6 towards the discharge outlet 7. Under the action of the mixing element, it undergoes thorough mixing and is finally discharged from the discharge outlet 7. This realizes continuous feeding, mixing, and discharging operations, avoiding material retention or back mixing in the tank, thereby ensuring the continuity of the mixing process and the uniformity of the discharge, and ensuring stable and controllable mixing quality.

[0036] It is understood that, as a preferred implementation, the cylinder of the mixing tank 4 near the inlet 5 and outlet 7 can adopt a tapered section structure to facilitate the introduction and discharge of materials; or, the axis of the mixing tank 4 can be set at a small inclination angle of 0° to 5° relative to the horizontal plane to assist the material to move slowly from the inlet 5 to the outlet 7 with the help of gravity; or, several axially extending guide strips can be provided on the inner wall of the mixing tank 4 to improve the flow state of the material near the tank wall and prevent it from sticking to the wall and accumulating.

[0037] The main stirring rod 8 is pivotally connected to the mixing tank 4 and located within the mixing chamber 6. The main stirring rod 8 has multiple first spiral stirring blades 9, which are spirally arranged sequentially around the axis of the main stirring rod 8 and spaced apart. Each first spiral stirring blade 9 has a scraper 10 located at the end of the first spiral stirring blade 9 furthest from the main stirring rod 8. The scraper 10 is used to scrape the inner wall of the mixing tank 4. The main stirring rod 8, pivotally connected to the mixing tank 4 and housed within the mixing chamber 6, serves as the core power transmission element. After receiving rotational torque input from an external drive device, it rotates around its own axis, providing the necessary shearing, tumbling, and propulsive forces for mixing the materials within the mixing chamber 6. The main stirring rod 8 has multiple first spiral stirring blades 9, which are sequentially arranged along the axial direction of the main stirring rod 8 and spirally extend around its axis, with each first spiral stirring blade 9 spaced apart. With the above arrangement, the first spiral stirring blade 9, when rotating with the main stirring rod 8, can apply a combined axial and circumferential driving force to the material in the mixing chamber 6. The material undergoes dispersion, compression, and mixing in the interval area between adjacent first spiral stirring blades 9, thereby eliminating the mixing dead zone. This allows material components with different particle sizes and specific gravities to achieve a synergistic effect of macroscopic convection and microscopic diffusion throughout the entire length of the mixing chamber 6. A scraper 10 is provided at the end of the first spiral stirring blade 9 away from the main stirring rod 8. The scraper 10 rotates synchronously with the first spiral stirring blade 9, and its outer edge maintains contact or a small gap fit with the inner wall of the mixing tank 4. When the mixing is running, the scraper 10 continuously scrapes the inner wall of the mixing tank 4, effectively removing the material layer adhering to the inner wall, preventing the material from aging or agglomerating due to prolonged retention on the wall surface. At the same time, the scraped-off material is reintroduced into the main mixing zone 20 to participate in the mixing, thereby ensuring the full utilization of the material and the consistency of the output composition, and improving the operational reliability and output quality of the mixing equipment.

[0038] The output end of the power source is connected to the main stirring rod 8 via a transmission component 11 to drive the main stirring rod 8 to rotate. The rotational power output by the power source is transmitted to the main stirring rod 8 via the transmission component 11, driving the main stirring rod 8 to rotate around its own axis, thereby providing a continuous and stable mechanical driving force for mixing materials within the stirring chamber 6. Through the intermediate connection of the transmission component 11, flexible or rigid power coupling between the power source and the main stirring rod 8 can be achieved. This allows for adjustment of the speed and torque transmission characteristics according to operating conditions, effectively isolating vibration and impact between the power source and the stirring rod, ensuring the stable operation of the main stirring rod 8 under fluctuating load conditions, and facilitating the arrangement and maintenance of the power source, while reducing the installation accuracy requirements and operating noise of the drive system.

[0039] As an alternative implementation, the mixing tank 4 can also adopt a support and rotation structure combining support rollers and rolling rings, that is, the mixing tank 4 is supported on the support rollers by the rolling rings and the rolling rings are driven by the drive device to rotate; or, the driving method of the mixing tank 4 can also adopt pin gear transmission, with pin gear rings set on the outer wall of the tank body to mesh with the drive gear, which is suitable for heavy-load low-speed working conditions; in addition, a hydraulic motor can be used to directly drive the slewing bearing of the mixing tank 4, and the high torque output characteristics of the hydraulic system can be used to achieve smooth rotation of the tank body. All of the above alternative solutions can achieve the overall rotation of the mixing tank 4 to complete the function of material mixing. The specific form can be selected according to the working load, installation space and cost requirements.

[0040] Working principle: The base 1 is equipped with casters 2 and support rods 3. The casters 2 are used to move the equipment to the working position. The mixing tank 4 is fixed above the base 1 and supported by the support rods 3. Its cylindrical horizontal structure with its axis parallel to the horizontal plane is used to accommodate materials and lower the center of gravity. The feed inlet 5, the mixing chamber 6, and the discharge outlet 7 are connected in sequence and are located at opposite ends of the mixing tank 4. After the materials to be mixed are put into the mixing tank 4 through the feed inlet 5, they are stirred in the mixing chamber 6 and move towards the discharge outlet 7, and finally discharged to achieve continuous mixing operation. The main stirring rod 8 is pivotally connected to the mixing tank 4 and housed in the mixing chamber 6. The power source drives the main stirring rod 8 to rotate around its own axis through the transmission component 11, transmitting the rotational power to the inside of the mixing chamber 6. Multiple first spiral stirring blades 9 are arranged spirally and alternately around the axis of the main stirring rod 8. As the main stirring rod 8 rotates, they apply a combined axial and circumferential driving force to the material, causing the material to undergo dispersion, compression, and mixing within the intervals between adjacent first spiral stirring blades 9. This achieves macroscopic convection and microscopic diffusion of the material throughout the entire length of the mixing chamber 6. A scraper 10 is located at the end of the first spiral stirring blade 9 furthest from the main stirring rod 8. It rotates synchronously with the first spiral stirring blade 9 and continuously scrapes the inner wall of the mixing tank 4, removing the material layer adhering to the inner wall and reintroducing it into the mixing zone 20 to participate in mixing, ensuring full utilization of the material and consistency with the output composition. The rotational power output from the power source is transmitted to the main stirring rod 8 via the transmission component 11, driving the main stirring rod 8 to rotate around its own axis, providing a continuous and stable mechanical driving force for mixing the material within the mixing chamber 6. The intermediate connection of the transmission component 11 achieves power coupling between the power source and the main stirring rod 8, transmitting torque while isolating vibration and impact, ensuring the smooth operation of the main stirring rod 8 under fluctuating load conditions. With the above structural configuration, the mixing device can complete the continuous mixing operation of the materials to be mixed from feeding to discharging, and achieve synergistic cooperation in terms of ease of movement, stable support, homogeneous mixing and stable operation.

[0041] Clearly, the base 1, via the casters 2, allows the equipment to be moved to the work position. Combined with multiple support rods 3, it rests against the ground when parked, providing the equipment with flexible relocation mobility and reliable parking stability, effectively improving on-site deployment efficiency and operational safety. The mixing tank 4, supported by the support rods 3, is mounted above the base 1. Its cylindrical horizontal layout, with its axis parallel to the horizontal plane, lowers the overall center of gravity, enhancing the equipment's anti-tipping ability during movement and operation. The feed inlet 5, mixing chamber 6, and discharge outlet 7 are sequentially connected and located at opposite ends of the mixing tank 4. This allows the material to move continuously axially towards the discharge outlet 7 after being stirred within the mixing chamber 6, preventing material stagnation or back-mixing and ensuring the continuity of the mixing process and the uniformity of the discharge. The main stirring rod 8 receives rotational drive from the power source through the transmission component 11, rotating around its own axis within the mixing chamber 6, converting power into mechanical motion of the stirring element, providing a continuous and stable driving force for material mixing. Multiple first spiral stirring blades 9 are arranged spirally and alternately around the axis of the main stirring rod 8. As the main stirring rod 8 rotates, they apply a combined driving force along the axial and circumferential directions to the material. The material undergoes dispersion, compression, and mixing in each interval area, realizing macroscopic convection and microscopic diffusion of the material throughout the entire length of the stirring chamber 6, eliminating mixing dead zones. The scraper 10 is located at the end of the first spiral stirring blades 9 away from the main stirring rod 8. It rotates synchronously with the first spiral stirring blades and continuously scrapes the inner wall of the mixing tank 4, removing the material layer adhering to the wall and reintroducing it into the stirring zone 20 to participate in mixing. This prevents the material from aging or agglomerating due to wall adhesion, improving material utilization and the consistency of the output composition. The intermediate connection of the transmission component 11 realizes flexible or rigid power coupling between the power source and the main stirring rod 8. While transmitting torque, it isolates vibration and impact, ensuring the smooth operation of the main stirring rod 8 under load fluctuation conditions, and reducing the installation accuracy requirements and operating noise of the drive system. Thus, the mixing device achieves synergistic coordination in terms of ease of movement, stable support, homogeneous mixing, and stable operation, ensuring stable and controllable mixing quality.

[0042] In this embodiment, preferably, an asphalt pavement recycling mixing device further includes an auxiliary mixing rod 12. The main mixing rod 8 and the auxiliary mixing rod 12 are located on opposite sides of the axis of the mixing tank 4. The main mixing rod 8 is positioned below the auxiliary mixing rod 12. The auxiliary mixing rod 12 is provided with a plurality of second spiral mixing blades 13, which are spirally arranged around the axis of the auxiliary mixing rod 12 and spaced apart. The axes of the main mixing rod 8 and the auxiliary mixing rod 12 are both parallel to the axis of the mixing tank 4. The outer diameter of the first spiral mixing blade 9 is larger than the outer diameter of the second spiral mixing blade 13. The first spiral mixing blade 9 and the second spiral mixing blade 13 have an intersecting area in the radial projection of the mixing tank 4, that is, the rotation trajectories of the two sets of mixing blades partially overlap in space, but the mixing blades are staggered in the axial direction, so that the main mixing rod 8 and the auxiliary mixing rod 12 will not physically interfere during synchronous or asynchronous rotation. Through the aforementioned spatial layout, the material located in the upper part of the mixing chamber 6 moves downward under the push of the second spiral stirring blade 13, while the material located in the lower part of the mixing chamber 6 is pushed upward under the push of the first spiral stirring blade 9. The two sets of stirring blades apply shearing and mixing action to the materials moving in opposite directions in the intersecting area, so that the upper and lower layers of materials achieve forced cross-exchange and dispersion in this area. This effectively eliminates the weak mixing areas that are difficult to cover in the height direction of the tank by a single stirring rod, avoids uneven mixing caused by material stratification, and improves the homogenization degree and component distribution uniformity of materials at all heights in the entire cross section of the mixing chamber 6. The outer diameter of the first spiral stirring blade 9 is larger than the outer diameter of the second spiral stirring blade 13. The main stirring rod 8 provides a wide range of stirring and pushing for the lower material, while the auxiliary stirring rod 12 provides fine supplementary mixing in the upper part. The two work together to achieve effective coverage of the entire volume of the mixing chamber 6.

[0043] In this embodiment, preferably, the transmission component 11 includes a first transmission wheel 14 connected to the main stirring rod 8 and a second transmission wheel 15 connected to the auxiliary stirring rod 12. The first transmission wheel 14 and the second transmission wheel 15 have different gear ratios to ensure that the main stirring rod 8 and the auxiliary stirring rod 12 rotate at different speeds. After the main stirring rod 8 and the auxiliary stirring rod 12 operate at different speeds, the first spiral stirring blade 9 and the second spiral stirring blade 13 driven by them respectively apply shearing and propulsive forces of different speeds and intensities to the material in the interlaced area. Due to the difference in speed, the material in the upper layer of the stirring chamber 6 and the material in the lower layer are subjected to asymmetrical kneading and tumbling when they meet in the interlaced area. This avoids the material forming a relatively static flow state in the interlaced area due to the same speed, thereby enhancing the cross-mixing effect between the stirring blades with different speeds. Meanwhile, the speed difference between the main stirring rod 8 and the auxiliary stirring rod 12 allows particles of different sizes and specific gravities to achieve differentiated accelerations when traversing the interlacing region. Larger particles are fully propelled by the low-speed stirring blades, while smaller particles are rapidly dispersed by the high-speed stirring blades. This achieves targeted mixing of different components, further improving the macroscopic homogeneity and microscopic dispersion of the mixture. The first drive wheel 14 and the second drive wheel 15 can use gear pairs with different numbers of teeth, and a fixed speed difference between the main stirring rod 8 and the auxiliary stirring rod 12 can be achieved by changing the tooth ratio; alternatively, the first drive wheel 14 and the second drive wheel 15 can use pulleys of different diameters, and differential drive between the two rods can be achieved through belt drive; an intermediate speed change mechanism can also be set in the transmission path to achieve an adjustable speed ratio between the two stirring rods through a multi-stage gear combination.

[0044] It is understood that, as an alternative implementation, the main stirring rod 8 and the auxiliary stirring rod 12 can also be driven by two independent power sources, and their speeds can be adjusted independently through their respective control systems to achieve more flexible differential control; or, a clutch device can be provided in the transmission component 11 so that the auxiliary stirring rod 12 can selectively engage or disengage from the power transmission path according to the working conditions; in addition, a differential structure can be adopted between the first transmission wheel 14 and the second transmission wheel 15 to automatically adjust the speed distribution of the two stirring rods when the load changes, so as to adapt to the load changes caused by the fluctuation of material characteristics.

[0045] In this embodiment, preferably, the spiral direction of the first spiral stirring blade 9 is opposite to that of the second spiral stirring blade 13, and the rotation directions of the main stirring rod 8 and the auxiliary stirring rod 12 are opposite. Since the spiral direction of the first spiral stirring blade 9 is opposite to that of the second spiral stirring blade 13, and the rotation directions of the main stirring rod 8 and the auxiliary stirring rod 12 are opposite, when the main stirring rod 8 and the auxiliary stirring rod 12 rotate synchronously, the first spiral stirring blade 9 and the second spiral stirring blade 13 apply opposite axial thrusts to the materials in their respective areas. This causes the materials in the lower part of the mixing chamber 6 to move in one axial direction under the push of the first spiral stirring blade 9, while the materials in the upper part of the mixing chamber 6 move in the opposite axial direction under the push of the second spiral stirring blade 13. The upper and lower layers of materials form opposite axial flows in the mixing chamber 6. After the two layers of materials flow to the end of the mixing tank 4, they turn and enter the opposite area under the obstruction of the end wall. This forms a closed circulation loop in the entire mixing chamber 6, allowing the materials to repeatedly experience alternating movements of rising, falling, forward propulsion, and reverse flow throughout the entire length of the mixing chamber 6, significantly extending the average residence time of the materials in the mixing chamber 6. Meanwhile, the combination of reverse spirals and reverse rotation ensures that the shearing directions of the first spiral mixing blade 9 and the second spiral mixing blade 13 on the material in the intersecting area are also opposite. When the material passes through the intersecting area, it is subjected to opposite shearing forces from both the top and bottom sides, resulting in a strong kneading and tearing effect, which promotes more thorough contact and fusion of new and old asphalt and recycling agents at the microscopic level. For example, the main mixing rod 8 and the auxiliary mixing rod 12 can be set to rotate in opposite directions according to the mixing process requirements, so that both mixing rods push the material upward or downward in the intersecting area to enhance the local turbulence intensity in that area; or, the rotation direction of the auxiliary mixing rod 12 can be switched by changing whether the idler wheel is engaged in the transmission path, so that the same equipment can adapt to different process requirements of forward and reverse mixing; the rotation direction of the main mixing rod 8 and the auxiliary mixing rod 12 can also be switched at different working stages of the mixing tank 4, so that the material obtains strong convective mixing in the early stage of mixing and mild homogenization in the later stage of mixing.

[0046] In this embodiment, preferably, the inner wall of the mixing tank 4 is provided with a plurality of heating elements 16, which are arranged circumferentially around the mixing tank 4; a heat-conducting layer 17 is provided on the side of the heating element 16 near the mixing chamber 6 so that the heat of the heating element 16 is evenly conducted into the mixing chamber 6. Heating elements 16 are spaced around the circumference of the mixing tank 4, thus forming uniformly distributed heat source points in the circumferential direction of the mixing tank 4, avoiding heat concentration in local areas and overheating. A heat-conducting layer 17 is provided on the side of the heating element 16 near the mixing chamber 6. The heat-conducting layer 17 covers the surface of the heating element 16 and extends into the area directly adjacent to the mixing chamber 6. The heat generated by the heating element 16 is transferred to the mixing chamber 6 through conduction and diffusion by the heat-conducting layer 17, so that the heat is evenly distributed along the plane direction of the heat-conducting layer 17 during the transfer process, and finally enters the interior of the mixing chamber 6 with a relatively consistent heat flux density. This achieves uniform temperature field in the entire circumference of the mixing chamber 6, effectively eliminating local high-temperature and low-temperature areas caused by the discrete arrangement of the heating elements 16. The uniform temperature environment allows temperature-sensitive materials such as asphalt to obtain consistent fluidity during the mixing process, avoiding insufficient fusion of new and old asphalt or uneven diffusion of recycling agents due to temperature gradients, and improving the overall mixing quality and stability of road performance of the recycled mixture.

[0047] It is understood that, as an alternative implementation, the heating element 16 may also be disposed on the outer wall of the mixing tank 4 and conduct heat through the tank wall, in conjunction with the heat insulation layer on the outer periphery of the tank wall to reduce heat loss; or, the heating element 16 may be embedded in the tank wall of the mixing tank 4, and the heat may be transferred to the mixing chamber 6 through the tank wall material itself as a heat conduction medium.

[0048] In this embodiment, preferably, the mixing tank 4 is provided with two heat insulation rings 18, which are disposed inside the mixing tank 4 and arranged circumferentially around the mixing tank 4. The two heat insulation rings 18 are spaced apart along the axial direction of the mixing tank 4, and the heat insulation rings 18 divide the mixing chamber 6 into a preheating zone 19, a mixing zone 20, and a heat preservation zone 21. The preheating zone 19, the mixing zone 20, and the heat preservation zone 21 are arranged sequentially along the direction of movement of the material to be mixed. The heating element 16 is disposed in the preheating zone 19 and the mixing zone 20, and the temperature of the mixing zone 20 is higher than the temperature of the preheating zone 19. The heat insulation rings 18 achieve thermal isolation between the various zones, effectively reducing heat transfer and thermal interference between different temperature zones along the axial direction of the tank, so that each zone can maintain an independent temperature level. The heat insulation ring 18 can be made of high-temperature resistant rubber or ceramic fiber, achieving thermal isolation between zones through its low thermal conductivity. Alternatively, the heat insulation ring 18 can be a detachable structure, allowing adjustment of its installation position to change the length ratio of each zone according to the mixing process requirements. Furthermore, the heat insulation ring 18 can also be a hollow metal ring filled with heat insulation material to enhance insulation while maintaining structural strength. The heating element 16 is located in the preheating zone 19 and the mixing zone 20, with the temperature of the mixing zone 20 being higher than that of the preheating zone 19. The heating element 16 in the preheating zone 19 preheats the material to be mixed entering the mixing chamber 6, pre-raising the material's temperature before it enters the main mixing zone 20, reducing the temperature difference between the material and the mixing zone 20, and preventing localized rapid cooling caused by cold material directly entering the high-temperature mixing zone 20. The heating element 16 in the mixing zone 20 maintains a high-temperature environment with higher heating power, ensuring the material reaches the target mixing temperature and achieves sufficient fluidity and mixability within this zone. No heating element 16 is installed in the insulation zone 21. A heat insulation ring 18 blocks heat conduction from the mixing zone 20, ensuring that the temperature of the insulation zone 21 is lower than that of the mixing zone 20 but higher than or close to that of the preheating zone 19. This maintains the temperature of the mixed material before discharge, preventing excessive heat loss and insufficient discharge temperature. It also avoids overheating and aging of the mixed material before discharge due to continuous high-temperature heating. Through this zoned temperature control structure, the recycled mixture achieves a temperature profile matching the process requirements at each stage, effectively improving mixing quality and temperature control accuracy.

[0049] In this embodiment, preferably, the arrangement density of heating elements 16 in the mixing zone 20 is greater than that in the preheating zone 19; the heating power density per unit area of ​​the heating elements 16 located at the bottom of the mixing tank 4 is greater than that of the heating elements 16 located at the top of the mixing tank 4. The greater arrangement density of heating elements 16 in the mixing zone 20 results in a higher heat supply intensity per unit volume in the mixing zone 20 compared to the preheating zone 19. This allows the material to quickly reach and maintain the target mixing temperature after entering the mixing zone 20, meeting the high-temperature environment requirements of the main mixing stage. The greater heating power density per unit area of ​​the heating elements 16 located at the bottom of the mixing tank 4 is also due to the material accumulating at the bottom of the mixing tank 4 under gravity, resulting in a thicker bottom material layer and higher compaction. The longer heating path and higher bottom heating power density can compensate for the hindering effect of the material accumulation layer on heat conduction, allowing heat to penetrate the material layer and form a concentrated heat source in the bottom area, accelerating the heat absorption and temperature rise of the bottom material. The top heating element 16 has a relatively low power density, which is used to maintain the temperature of the upper space to prevent the top material from dissipating heat too quickly, and at the same time avoid overheating of the upper material, which could lead to surface overheating or aging. Through the above differentiated arrangement, the temperature gradient in different areas of the stirring chamber 6 is more reasonable, and the material obtains a uniform temperature rise in the stirring zone 20, which effectively improves heating efficiency and reduces the risk of overheating.

[0050] In this embodiment, preferably, a rounded corner or beveled transition is provided between the heat insulation ring 18 and the inner wall of the mixing tank 4, and the heat insulation ring 18 is made of heat insulation material. The rounded corner or bevel is located at the junction of the heat insulation ring 18 and the inner wall of the tank, so that the connection area between the heat insulation ring 18 and the tank wall forms a smooth guide surface, avoiding the dead zone and local accumulation of material flow caused by right-angle connection. When the material flows through the cross section where the heat insulation ring 18 is located, it flows smoothly along the rounded corner or bevel, eliminating the material stagnation and eddy area caused by the abrupt change in cross section, ensuring the continuity and smoothness of material flow between each zone, thereby avoiding aging and agglomeration or abnormal temperature caused by the material staying at the connection between the heat insulation ring 18 and the tank wall for a long time, and improving the uniformity and consistency of the output quality. The heat insulation ring 18 is made of heat insulation material and has low thermal conductivity, which effectively blocks heat transfer between adjacent areas along the tank axial direction. This maintains the temperature gradient between the preheating zone 19, the stirring zone 20, and the insulation zone 21, reducing thermal crosstalk between areas and ensuring the accuracy and stability of independent temperature control in each zone. The heat insulation ring 18 can be made of heat insulation materials such as ceramic fiber, aerogel composite material, or calcium silicate board.

[0051] It is understood that, as an alternative implementation, the transition structure between the heat insulation ring 18 and the inner wall of the mixing tank 4 can also adopt a stepped gradual structure, that is, the end of the heat insulation ring 18 gradually narrows along the axial direction to form a multi-step transition surface.

[0052] In this embodiment, preferably, the auxiliary stirring rod 12 is provided with a liquid passage chamber 22, and the auxiliary stirring rod 12 is provided with a plurality of liquid passage holes 23. The plurality of liquid passage holes 23 are spirally distributed along the axial direction of the auxiliary stirring rod 12, and the liquid passage holes 23 communicate with the liquid passage chamber 22 to form a liquid passage. The liquid passage holes 23 are provided in the stirring zone 20, and the liquid passage holes 23 are used to add regenerant to the stirring zone 20. The pitch of the spiral distribution of the liquid passage holes 23 along the axial direction of the auxiliary stirring rod 12 is the same as the pitch of the second spiral stirring blade 13. Multiple liquid passage holes 23 are spirally distributed along the axial direction of the auxiliary stirring rod 12. The liquid passage holes 23 are connected to the liquid cavity 22 to form a liquid passage. The regenerant enters the liquid cavity 22 from the external supply source, flows through the liquid passage holes 23, and is released into the stirring zone 20. The pitch of the spiral distribution of the liquid passage holes 23 along the axial direction of the auxiliary stirring rod 12 is the same as the pitch of the second spiral stirring blade 13, so that the axial position of the liquid passage holes 23 on the auxiliary stirring rod 12 corresponds one-to-one with the axial position of the second spiral stirring blade 13. When the auxiliary stirring rod 12 rotates, the liquid passage holes 23 rotate synchronously with the auxiliary stirring rod 12, and the liquid outlet position of each liquid passage hole 23 always remains fixed with the corresponding second spiral stirring blade 13. In terms of phase relationship, after the regenerant is discharged from the liquid passage 23, it is directly released in the axial region where the second spiral stirring blade 13 is located. Under the pushing and turning action of the second spiral stirring blade 13 on the material, the regenerant is immediately wrapped into the material and moves with the material, avoiding the phenomenon of excessively high local concentration caused by the concentrated distribution of the regenerant along the axial or radial direction in the stirring chamber 6. At the same time, the spiral distribution of the liquid passage 23 and the pitch of the second spiral stirring blade 13 are the same, so that the regenerant is uniformly injected along the axial direction in the stirring zone 20, and the amount of regenerant added at each axial position tends to be consistent, thereby ensuring the uniform dispersion and full utilization of the regenerant throughout the entire length of the stirring zone 20.

[0053] In this embodiment, preferably, the liquid passage chamber 22 is provided with a guide hole 24, an elastic element 25, a pressure-bearing guide element 26, and a sealing rod 27. The guide hole 24 is a blind hole and is coaxially arranged with the liquid passage hole 23. The elastic element 25 is disposed in the guide hole 24. The pressure-bearing guide element 26 is fixedly connected to the sealing rod 27 and is disposed in the guide hole 24 and slidably connected to the guide hole 24. One end of the elastic element 25 abuts against the bottom of the guide hole 24. The other end of the elastic member 25 abuts against the pressure-bearing guide member 26, so that the pressure-bearing guide member 26 has a tendency to move away from the bottom of the guide hole 24; the sealing rod 27 is coaxially arranged with the liquid passage hole 23, so that the sealing rod 27 can move along the axial direction of the guide hole 24, and the sealing rod 27 is used to slide with the liquid passage hole 23 to block or open the liquid passage hole 23; the end of the sealing rod 27 facing the liquid passage hole 23 is provided with a conical sealing head;

[0054] The sealing rod 27 is configured such that when the pressure in the liquid passage chamber 22 increases due to the regenerant filling it, the pressure-bearing guide 26 is pressed closer to the bottom of the guide hole 24, causing the sealing rod 27 to move away from the liquid passage hole 23, thereby opening the liquid passage hole 23; when the pressure in the liquid passage chamber 22 decreases, the pressure-bearing guide 26 moves away from the bottom of the guide hole 24 under the action of the elastic member 25, causing the sealing rod 27 to block the liquid passage hole 23. The guide hole 24 is a blind hole and is coaxially arranged with the liquid passage hole 23. An elastic element 25 is disposed within the guide hole 24. A pressure-bearing guide element 26 is fixedly connected to the sealing rod 27. The pressure-bearing guide element 26 is disposed within the guide hole 24 and slidably connected to it. One end of the elastic element 25 abuts against the bottom of the guide hole 24, and the other end abuts against the pressure-bearing guide element 26. The elastic element 25 applies an elastic force to the pressure-bearing guide element 26 away from the bottom of the guide hole 24, causing the pressure-bearing guide element 26 to have a tendency to move away from the bottom of the guide hole 24. The sealing rod 27 is coaxially arranged with the liquid passage hole 23 and can move along the axial direction of the guide hole 24. The sealing rod 27 is used to slide with the liquid passage hole 23 to block or open the passage hole. The liquid passage 23 and the end of the sealing rod 27 facing the liquid passage 23 are provided with a conical sealing head. When the sealing rod 27 moves towards the liquid passage 23, the conical sealing head gradually embeds into the liquid passage 23. As the embedment depth increases, the contact area between the conical sealing head and the inner wall of the liquid passage 23 gradually increases, thereby achieving a progressive sealing effect. When the sealing rod 27 moves away from the liquid passage 23, the conical sealing head gradually withdraws from the liquid passage 23, and the flow cross section of the liquid passage 23 gradually increases, achieving progressive opening. This avoids the impact and wear caused by sudden opening or closing between the sealing rod 27 and the liquid passage 23, effectively improving the service life and sealing reliability of the seal. When the liquid passage chamber 22 is filled with regenerant and the pressure increases, the regenerant pressure acts on the side of the pressure-bearing guide 26 facing the bottom of the guide hole 24. Under the pressure, the pressure-bearing guide 26 overcomes the elastic force of the elastic element 25 and approaches the bottom of the guide hole 24, driving the sealing rod 27 to move synchronously and move away from the liquid passage 23, thereby opening the liquid passage 23. The regenerant flows from the liquid passage chamber 22 through the liquid passage 23 and is discharged outward. When the pressure in the liquid passage chamber 22 decreases, the pressure on the pressure-bearing guide 26 decreases, and under the action of the elastic force of the elastic element 25, it moves away from the bottom of the guide hole 24, driving the sealing rod 27 to move towards the liquid passage 23, so that the conical sealing head is re-embedded into the liquid passage 23 to achieve sealing. Thus, the opening and closing of the liquid passage 23 is automatically controlled according to the pressure change of the regenerant in the liquid passage chamber 22, without the need for external control signals or additional actuators. The structure is simple and the response is reliable.

[0055] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0056] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0057] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An asphalt pavement recycling mixing plant, characterized in that, include: The base (1) is provided with casters (2) and support rods (3). The casters (2) are located below the base (1). The support rods (3) are provided with multiple rods. A mixing tank (4) is located above the base (1) and supported by the support rod (3). The mixing tank (4) has a cylindrical structure and its axis is parallel to the horizontal plane. The mixing tank (4) is provided with a feed inlet (5), a mixing chamber (6), and a discharge outlet (7) connected in sequence. The feed inlet (5) and the discharge outlet (7) are located at opposite ends of the mixing tank (4). The feed inlet (5) is used to fill the material to be mixed, and the discharge outlet (7) is used to discharge the mixed material. The main stirring rod (8) is pivotally connected to the stirring tank (4) and located in the stirring chamber (6). The main stirring rod (8) is provided with a plurality of first spiral stirring blades (9). The plurality of first spiral stirring blades (9) are spirally arranged in sequence around the axis of the main stirring rod (8) and are spaced apart. The first spiral stirring blades (9) are provided with scrapers (10). The scrapers (10) are located at the end of the first spiral stirring blades (9) away from the main stirring rod (8). The scrapers (10) are used to scrape the inner wall of the stirring tank (4). The power source has its output end connected to the main stirring rod (8) via a transmission component (11) to drive the main stirring rod (8) to rotate.

2. The asphalt pavement recycling mixing device according to claim 1, characterized in that, The asphalt pavement recycling mixing device further includes a secondary mixing rod (12). The main mixing rod (8) and the secondary mixing rod (12) are located on opposite sides of the axis of the mixing tank (4). The main mixing rod (8) is located below the secondary mixing rod (12). The secondary mixing rod (12) is provided with a plurality of second spiral mixing blades (13). The plurality of second spiral mixing blades (13) are spirally arranged around the axis of the secondary mixing rod (12) and are arranged at intervals. The axis of the main mixing rod (8) and the axis of the secondary mixing rod (12) are both parallel to the axis of the mixing tank (4). The outer diameter of the first spiral mixing blade (9) is larger than the outer diameter of the second spiral mixing blade (13).

3. The asphalt pavement recycling mixing device according to claim 2, characterized in that, The transmission component (11) includes a first transmission wheel (14) connected to the main stirring rod (8) and a second transmission wheel (15) connected to the auxiliary stirring rod (12). The first transmission wheel (14) and the second transmission wheel (15) have different gear ratios so that the main stirring rod (8) and the auxiliary stirring rod (12) have different rotational speeds.

4. The asphalt pavement recycling mixing device according to claim 2, characterized in that, The spiral direction of the first spiral stirring blade (9) is opposite to that of the second spiral stirring blade (13), and the rotation directions of the main stirring rod (8) and the auxiliary stirring rod (12) are opposite.

5. The asphalt pavement recycling mixing device according to claim 1, characterized in that, The inner wall of the mixing tank (4) is provided with a plurality of heating elements (16), which are arranged circumferentially around the mixing tank (4); a heat-conducting layer (17) is provided on the side of the heating element (16) near the mixing chamber (6) so that the heat of the heating element (16) is evenly conducted into the mixing chamber (6).

6. The asphalt pavement recycling mixing plant according to claim 5, characterized in that, The mixing tank (4) is provided with two heat insulation rings (18). The heat insulation rings (18) are located inside the mixing tank (4) and are arranged around the circumference of the mixing tank (4). The two heat insulation rings (18) are spaced apart along the axial direction of the mixing tank (4). The heat insulation rings (18) divide the mixing chamber (6) into a preheating zone (19), a mixing zone (20), and a heat preservation zone (21). The preheating zone (19), the mixing zone (20), and the heat preservation zone (21) are arranged sequentially along the direction of movement of the material to be mixed. The heating element (16) is located in the preheating zone (19) and the mixing zone (20). The temperature of the mixing zone (20) is higher than the temperature of the preheating zone (19).

7. The asphalt pavement recycling mixing plant according to claim 6, characterized in that, The arrangement density of heating elements (16) in the stirring zone (20) is greater than that of heating elements (16) in the preheating zone (19); the heating power density per unit area of ​​the heating elements (16) at the bottom of the stirring tank (4) is greater than that of the heating elements (16) at the top of the stirring tank (4).

8. An asphalt pavement recycling mixing plant according to claim 6, characterized in that, The heat insulation ring (18) and the inner wall of the mixing tank (4) are provided with a rounded corner or a beveled transition, and the heat insulation ring (18) is made of heat insulation material.

9. An asphalt pavement recycling mixing plant according to claim 2 or 6, characterized in that, The auxiliary stirring rod (12) is provided with a liquid passage chamber (22) and a plurality of liquid passage holes (23). The plurality of liquid passage holes (23) are spirally distributed along the axial direction of the auxiliary stirring rod (12). The liquid passage holes (23) are connected to the liquid passage chamber (22) to form a liquid passage. The liquid passage holes (23) are located in the stirring zone (20) and are used to add regenerator to the stirring zone (20). The pitch of the liquid passage holes (23) spirally distributed along the axial direction of the auxiliary stirring rod (12) is the same as the pitch of the second spiral stirring blade (13).

10. An asphalt pavement recycling mixing plant according to claim 9, characterized in that, The liquid passage chamber (22) is provided with a guide hole (24), an elastic element (25), a pressure-bearing guide element (26), and a sealing rod (27). The guide hole (24) is a blind hole and is coaxially arranged with the liquid passage hole (23). The elastic element (25) is disposed in the guide hole (24). The pressure-bearing guide element (26) is fixedly connected to the sealing rod (27). The pressure-bearing guide element (26) is disposed in the guide hole (24) and slidably connected to the guide hole (24). One end of the elastic element (25) abuts against the bottom of the guide hole (24). The other end of the elastic member (25) abuts against the pressure-bearing guide member (26) so that the pressure-bearing guide member (26) has a tendency to move away from the bottom of the guide hole (24); the sealing rod (27) is coaxially arranged with the liquid passage hole (23) so that the sealing rod (27) can move along the axial direction of the guide hole (24), and the sealing rod (27) is used to slide with the liquid passage hole (23) to block or open the liquid passage hole (23); the sealing rod (27) has a conical sealing head at one end facing the liquid passage hole (23); The sealing rod (27) is configured such that when the pressure in the liquid passage chamber (22) is increased due to the regenerant, the pressure-bearing guide (26) is pressed close to the bottom of the guide hole (24), which drives the sealing rod (27) away from the liquid passage hole (23) to open the liquid passage hole (23); when the pressure in the liquid passage chamber (22) decreases, the pressure-bearing guide (26) moves away from the bottom of the guide hole (24) under the action of the elastic member (25), which drives the sealing rod (27) to block the liquid passage hole (23).

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