High-efficiency asphalt regeneration production equipment

Abstract

The present application relates to the technical field of asphalt pavement material regeneration, and discloses efficient asphalt regeneration production equipment, which comprises a base plate, wherein two-stage return cylinders are arranged to realize secondary crushing of over-standard particles, and closed-loop screening ensures uniform particle size of regenerated aggregates; the brush plate can automatically clean the embedded materials in the screen holes without interfering with normal screening conditions, thereby solving the problems of screen hole blockage, flux attenuation and material accumulation caused by long-term operation. In addition, the present application additionally provides a waste gas heat exchange pre-drying structure, which can recycle and exchange heat of high-temperature waste gas generated during the working process of the heating cylinder and the mixing cylinder, utilize the waste heat to perform pre-drying treatment on the screened asphalt material particles, realize vapor-solid separation through the hydrophobic and breathable membrane, and cooperate with the scraper to dynamically scrape off condensation water and timely discharge. The spiral plate continuously lifts and disperses the aggregates during the conveying of the material, increases the contact area between the particles and the high-temperature gas flow, and adopts shear blades and adjustable spiral stirring blades to adapt to different viscosity and particle size asphalt mixtures.

Description

Technical Field

[0001] This invention relates to the field of asphalt pavement material recycling technology, specifically to high-efficiency asphalt recycling production equipment. Background Technology

[0002] With the accelerated development of green and resource-oriented road engineering, the recycling and reuse of milled waste asphalt pavement has become a core technology in road maintenance and infrastructure engineering. This effectively reduces the consumption of aggregates and new asphalt materials, minimizes solid waste pollution, and significantly improves the economic efficiency and environmental friendliness of road construction. As the core equipment for recycling and reusing waste asphalt, the processing precision and production efficiency of asphalt thermal recycling equipment directly determine the gradation stability, bonding performance, and finished product quality of the recycled asphalt mixture. This is crucial for ensuring the construction quality and service life of recycled asphalt pavement.

[0003] However, existing production equipment has significant technical defects and production shortcomings in the above-mentioned process flow. Firstly, the pretreatment stage lacks a secondary crushing function for large-diameter materials. Single crushing and screening cannot achieve precise control over the particle size of materials, resulting in a high residual amount of large particles. This not only causes material waste and low utilization rate of raw materials, but also leads to uneven heating and inconsistent melting inside and outside the heating cylinder after the residual large particles enter. This significantly increases the screening pressure on the filter plates, easily causing filter plate blockage and screening failure, frequently triggering equipment shutdowns for cleaning, and severely reducing the continuous operation efficiency of the production line.

[0004] Secondly, the asphalt particles after sorting and screening are not pre-dried and are directly sent into the heating cylinder for high-temperature heating. This makes it impossible to remove the moisture adsorbed inside the asphalt particles in advance, which easily leads to many problems such as slow heating, incomplete melting, and air bubbles in the mixture.

[0005] Third, traditional equipment has a simple mixing structure, which easily leads to material agglomeration and uneven mixing during the mixing process. This results in large differences in the performance of recycled materials from batch to batch and a low finished product qualification rate. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a high-efficiency asphalt recycling production equipment, which solves the problems of existing asphalt recycling production equipment lacking secondary crushing function, lacking pre-drying structure, and having poor mixing effect.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a high-efficiency asphalt recycling production equipment, comprising a base plate, wherein a recycling component and an auxiliary component are provided on the base plate, the recycling component is used for secondary crushing of asphalt particles, and the auxiliary component is used for pre-drying of asphalt particles;

[0008] The material return assembly includes a support frame, a shaking box, a first material return cylinder, and a second material return cylinder. Two connecting seats are installed on both sides of the shaking box. Two side plates are symmetrically installed on the upper surface of the support frame. Two return springs are installed at the upper end of each side plate. The return springs are fixedly connected to the connecting seats. The shaking box is inclined. Multiple sieve holes are evenly opened on the bottom wall of the shaking box. A drive motor is fixedly connected to the side wall of the shaking box. An eccentric block is fixedly connected to the output end of the drive motor. The drive motor drives the eccentric block to rotate, so that the shaking box screens asphalt particles. The inlet of the second material return cylinder is located below the output end of the shaking box. A second spiral conveyor plate is rotatably connected inside the second material return cylinder. The first material return cylinder and the second material return cylinder are connected in communication.

[0009] The auxiliary components include a heat exchanger and a pretreatment cylinder. A heat-conducting pipe is fixedly connected to the output end of the heat exchanger. The end of the heat-conducting pipe away from the heat exchanger is located inside the pretreatment cylinder. A rotating rod is rotatably connected to the center of the pretreatment cylinder. A stirring rack is slidably connected to the outer wall of the rotating rod. A breathable membrane is fixedly connected to the inner wall of the pretreatment cylinder. The breathable membrane is located above the stirring rack. A scraper is fixedly connected to the outer wall of the rotating rod. The scraper abuts against the upper surface of the breathable membrane. The rotation of the rotating rod drives the scraper to rotate, causing the scraper to scrape off water droplets from the upper surface of the breathable membrane.

[0010] Preferably, the support frame is fixedly connected to the upper surface of the substrate, a mixing cylinder is fixedly connected to the upper surface of the substrate, a hollow shaft is rotatably connected to the center of the mixing cylinder, a plurality of shearing blades are evenly installed on the outer wall of the hollow shaft, a drive shaft is coaxially sleeved inside the hollow shaft, and a protective shell is fixedly connected to the bottom end of the drive shaft.

[0011] Preferably, a rotating motor is fixedly connected inside the protective shell, and a first bevel gear is fixedly connected to the output end of the rotating motor. Multiple shafts are evenly installed around the protective shell, and spiral stirring blades and a second bevel gear are fixedly connected to both ends of the shafts. The teeth of the first bevel gear mesh with the teeth of the second bevel gear.

[0012] Preferably, the inner sidewall of the shaking box is provided with an installation groove, a slide rail is fixedly connected in the installation groove, a threaded seat is slidably connected in the slide rail, a threaded rod is rotatably connected in the slide rail, the threaded rod is threadedly connected to the threaded seat, and a brush plate is fixedly connected to the end of the threaded seat away from the slide rail.

[0013] Preferably, the upper surface of the support frame is fixedly connected to an installation frame, a heating cylinder, and an exhaust gas purification box. A crushing hopper is fixedly connected to the installation frame. Two crushing rollers are symmetrically installed inside the crushing hopper. A first spiral conveying plate is rotatably connected inside the first return material cylinder. An inclined pipe is fixedly connected to the outer wall of the first return material cylinder. The output end of the inclined pipe is located above the crushing hopper.

[0014] Preferably, a receiving hopper is fixedly connected between the two side plates, and a feed pipe is fixedly connected to the output end of the receiving hopper. The receiving hopper and the pretreatment cylinder are connected through the feed pipe.

[0015] Preferably, the rotating rod has a lifting groove, the stirring frame is slidably connected to the lifting groove, a compression spring is installed in the lifting groove, and a drain pipe is fixedly connected to the outer wall of the pretreatment cylinder.

[0016] Preferably, a rotating shaft is rotatably connected inside the heating cylinder, and a spiral plate is fixedly connected to the outer wall of the rotating shaft.

[0017] Preferably, the output port of the heating cylinder is fixedly connected to a discharge hopper, and the output end of the discharge hopper is fixedly connected to a conveying pipe.

[0018] Preferably, a discharge pipe is fixedly connected to the bottom end of the mixing cylinder, and a drain outlet is provided on the outer wall of the pretreatment cylinder.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. In this invention, a two-stage return cylinder is set up to achieve secondary crushing of excess particles, and closed-loop screening ensures uniform particle size of recycled aggregate. The brush plate can automatically clean the screen holes of embedded material without interfering with normal screening conditions, solving the problems of screen hole blockage, throughput reduction, and material accumulation during long-term operation, and is suitable for long-term continuous production. In addition, this invention adds a waste gas heat exchange pre-drying structure, which can recover and exchange heat with the high-temperature waste gas generated during the operation of the heating cylinder and mixing cylinder. The waste heat of the waste gas is used to pre-dry the asphalt material particles after screening, which can remove the adsorbed moisture inside the material in advance without the need for an additional drying heat source. The mixing rack turns the aggregate to achieve uniform contact with hot air and avoids uneven drying due to clumping. The hydrophobic and breathable membrane realizes vapor-solid separation, and the scraper dynamically scrapes off the condensate and discharges it in time to prevent the condensate from falling back and wetting the aggregate, ensuring the pre-dehumidification effect. It can effectively solve the quality defects such as slow heating, insufficient melting, and air bubbles in the mixture caused by direct high-temperature heating of materials, and significantly improve the structural strength and construction quality of recycled asphalt mixture.

[0021] 2. In this invention, the spiral plate continuously lifts and disperses the aggregate during material conveying, increasing the contact area between the particles and the high-temperature airflow. This avoids localized overheating or insufficient heating, ensuring that only the surface asphalt of the aggregate melts and forms a film while the aggregate matrix remains stable, resulting in high-quality, stable hot-recycled aggregate. A composite flow field structure is employed, combining shear blades for dispersion and adjustable spiral mixing blades for planetary mixing. The two drive mechanisms can be independently adjusted in speed and direction, and the spiral mixing blade posture can be flexibly adjusted to adapt to asphalt mixtures of different viscosities and particle sizes. This effectively breaks up agglomerates and lumps, improves the fusion effect of new and old materials and recycling agents, reduces defects such as stratification and insufficient mixing, and ensures stable quality of the finished recycled aggregate. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the high-efficiency asphalt recycling production equipment of the present invention;

[0023] Figure 2 This is a schematic cross-sectional view of the crushing bucket section of the high-efficiency asphalt recycling production equipment of the present invention.

[0024] Figure 3 This is a cross-sectional view of the shaking box section of the high-efficiency asphalt recycling production equipment of the present invention.

[0025] Figure 4 This is a cross-sectional structural diagram of the slide rail section of the high-efficiency asphalt recycling production equipment of the present invention;

[0026] Figure 5 This is a schematic cross-sectional view of the pretreatment cylinder of the high-efficiency asphalt recycling production equipment of the present invention.

[0027] Figure 6 This is a cross-sectional view of the mixing drum of the high-efficiency asphalt recycling production equipment of the present invention;

[0028] Figure 7 In the high-efficiency asphalt recycling production equipment of the present invention Figure 6 A magnified structural diagram at point A.

[0029] In the diagram: 1. Base plate; 2. Support frame; 3. Mixing cylinder; 4. Heating cylinder; 5. Exhaust gas purification box; 6. Heat exchanger; 7. Heat conduction pipe; 8. Drain pipe; 9. First return cylinder; 10. Side plate; 11. Shaking box; 12. Mounting frame; 13. Crushing hopper; 14. Inclined pipe; 15. Pretreatment cylinder; 16. Feed pipe; 17. First spiral conveyor plate; 18. Second return cylinder; 19. Second spiral conveyor plate; 20. Receiving hopper; 21. Crushing roller; 22. Connecting seat; 23. Return spring; 24. Mounting groove; 25. Slide rail; 6. Drive motor; 27. Eccentric block; 28. Brush plate; 29. ​​Threaded rod; 30. Threaded seat; 31. Breathable membrane; 32. Mixing rack; 33. Scraper; 34. Drain outlet; 35. Rotating rod; 36. Lifting groove; 37. Compression spring; 38. Rotating shaft; 39. Spiral plate; 40. Drive shaft; 41. Second bevel gear; 42. Discharge hopper; 43. Conveying pipe; 44. Hollow shaft; 45. Shearing blade; 46. Spiral mixing blade; 47. Discharge pipe; 48. Protective shell; 49. Rotating motor; 50. First bevel gear; 51. Shaft. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] refer to Figures 1-7 The high-efficiency asphalt recycling production equipment shown includes a base plate 1, on which a recycling component and an auxiliary component are mounted. The recycling component is used for secondary crushing of asphalt particles, and the auxiliary component is used for pre-drying of the asphalt particles. A specific embodiment is shown below:

[0032] Example 1

[0033] The upper surface of the support frame 2 is fixedly connected to the mounting frame 12, the heating cylinder 4, and the exhaust gas purification box 5. A crushing hopper 13 is fixedly connected to the mounting frame 12, and two crushing rollers 21 are symmetrically installed inside the crushing hopper 13. The return assembly includes the support frame 2, the shaking box 11, the first return cylinder 9, and the second return cylinder 18. Two connecting seats 22 are installed on both sides of the shaking box 11. Two side plates 10 are symmetrically installed on the upper surface of the support frame 2. Two return springs 23 are installed at the upper end of each side plate 10. The return springs 23 are fixedly connected to the connecting seats 22. The shaking box 11 is inclined. Multiple screen holes are evenly opened on the bottom wall of the shaking box 11. A drive motor 26 is fixedly connected to the side wall of the shaking box 11. The output end of the drive motor 26 is fixedly connected to the side wall of the shaking box 11. An eccentric block 27 is fixedly connected, and a drive motor 26 drives the eccentric block 27 to rotate, causing the shaking box 11 to screen asphalt particles. The inlet of the second return cylinder 18 is located below the output end of the shaking box 11. A second spiral conveyor plate 19 is rotatably connected inside the second return cylinder 18. The first return cylinder 9 is connected to the second return cylinder 18. A receiving hopper 20 is fixedly connected between the two side plates 10. A feed pipe 16 is fixedly connected to the output end of the receiving hopper 20. The receiving hopper 20 is connected to the pretreatment cylinder 15 through the feed pipe 16.

[0034] The first return cylinder 9 is rotatably connected to the first spiral conveyor plate 17. The outer wall of the first return cylinder 9 is fixedly connected to the inclined pipe 14. The output end of the inclined pipe 14 is located above the crushing bucket 13. The inner side wall of the shaking box 11 is provided with an installation groove 24. The installation groove 24 is fixedly connected to the slide rail 25. The slide rail 25 is slidably connected to the threaded seat 30. The slide rail 25 is rotatably connected to the threaded rod 29. The threaded rod 29 is threadedly connected to the threaded seat 30. The end of the threaded seat 30 away from the slide rail 25 is fixedly connected to the brush plate 28.

[0035] During equipment operation, workers feed the recycled waste asphalt into the crushing hopper 13. Inside the crushing hopper 13, two sets of crushing rollers 21 rotate at high speed in opposite directions. Utilizing the squeezing and shearing forces between the rollers, large and agglomerated asphalt waste is initially crushed and broken down into asphalt mixture particles of varying sizes. After the initial crushing, the asphalt mixture particles fall from the bottom outlet of the crushing hopper 13 and are smoothly fed into the shaking box 11 through a dedicated input hopper, completing the continuous feeding of materials.

[0036] After the material enters the shaking box 11, the drive motor 26 on the side wall is activated. The drive motor 26 drives the eccentric block 27 to rotate at high speed. The rotation of the eccentric block 27 generates a continuous centrifugal excitation force. In conjunction with the return spring 23 connected between the side plate 10 and the connecting seat 22, the tilted shaking box 11 generates high-frequency, stable reciprocating vibration. Under the action of vibration, the asphalt particles inside the shaking box 11 continuously tumble, jump, and slide. Qualified fine particles with a particle size smaller than the screen aperture can smoothly pass through the screen aperture on the bottom wall and fall into the receiving hopper 20 below. Finally, they are conveyed to the pretreatment cylinder 15 through the feed pipe 16 and enter the pre-drying process.

[0037] Large asphalt particles that exceed the size limit cannot pass through the screen holes and will slide continuously along the bottom wall of the inclined shaking box 11 towards the discharge end, eventually falling into the second return cylinder 18 below. They are then continuously conveyed by the second spiral conveyor plate 19 to the first return cylinder 9 and returned to the crushing bucket 13 for secondary crushing, realizing closed-loop crushing and screening of materials and ensuring uniform particle size of asphalt particles.

[0038] During long-term continuous screening operations, fine asphalt particles can easily become stuck and adhere to the screen holes on the bottom wall of the shaking box 11, causing screen blockage. This leads to problems such as reduced screening efficiency, inability of qualified materials to be discharged normally, and material accumulation. When the screen holes of the shaking box 11 become blocked and the material screening throughput decreases, the control system automatically starts the servo motor matched with the threaded rod 29. The servo motor drives the threaded rod 29 to rotate precisely in the forward direction. Through the thread transmission principle, it drives the threaded seat 30 to slide smoothly along the slide rail 25, thereby driving the brush plate 28 to move horizontally inside the shaking box 11. It is important to note that the unblocking operation is carried out synchronously with the screening operation, and the travel of the brush plate 28 is precisely limited. During the screening operation, the brush plate 28 initially stops and moves to the highest position on the inner wall of the shaking box 11. This position is far away from the main screening area of ​​the screen holes, so it will not block the screen holes or touch the normally tumbling and screening asphalt particles, and will not interfere with the normal screening, grading, and conveying of asphalt particles. During the movement of the brush plate 28, the plate body fits tightly against the end face of the screen holes, which can thoroughly scrape away and unclog the fine materials and impurities stuck or adhering to the screen holes, effectively solving the problem of screen hole blockage and ensuring stable and continuous operation of the shaking box 11 screening throughput. After the blockage is cleared, the servo motor rotates in the reverse direction, driving the brush plate 28 to reset, waiting for the next blockage clearing command.

[0039] Example 2

[0040] The auxiliary components include a heat exchanger 6 and a pretreatment cylinder 15. A heat pipe 7 is fixedly connected to the output end of the heat exchanger 6. The end of the heat pipe 7 away from the heat exchanger 6 is located inside the pretreatment cylinder 15. A rotating rod 35 is rotatably connected to the center of the pretreatment cylinder 15. A stirring rack 32 is slidably connected to the outer wall of the rotating rod 35. A breathable membrane 31 is fixedly connected to the inner wall of the pretreatment cylinder 15 and is located above the stirring rack 32. A scraper 33 is fixedly connected to the outer wall of the rotating rod 35 and abuts against the upper surface of the breathable membrane 31. The rotation of the rotating rod 35 drives the scraper 33 to rotate, so that the scraper 33 scrapes off the water droplets on the upper surface of the breathable membrane 31. A lifting groove 36 is opened in the rotating rod 35. The stirring rack 32 is slidably connected to the lifting groove 36. A compression spring 37 is installed in the lifting groove 36. A drain pipe 8 is fixedly connected to the outer wall of the pretreatment cylinder 15 and a drain outlet 34 is opened on the outer wall of the pretreatment cylinder 15.

[0041] During operation, the heat exchanger 6 continuously delivers constant low-temperature hot air to the pretreatment cylinder 15 through the heat pipe 7, performing low-temperature drying and dehumidification on the asphalt particles that have been screened and conveyed from the shaking box 11. A servo motor at the top of the pretreatment cylinder 15 drives the rotating rod 35 to rotate continuously and uniformly. The rotating rod 35 drives the stirring frame 32 to rotate synchronously, continuously turning and breaking up the asphalt particles accumulated inside the cylinder. This ensures that the asphalt particles are in full and uniform contact with the low-temperature hot air, avoiding incomplete drying in certain areas and particle clumping and dampness, thus guaranteeing uniform and consistent overall drying quality.

[0042] Throughout the entire low-temperature drying process, the discharge valve plate at the bottom of the pretreatment cylinder 15 remains closed, forming a sealed drying chamber inside the pretreatment cylinder 15. This effectively prevents the leakage of internal low-temperature hot air and the entry of external humid air into the cylinder, ensuring the stability of the sealed low-temperature drying environment and significantly improving the efficiency and effect of low-temperature drying.

[0043] During the drying process, the moisture inside the asphalt particles evaporates upon heating, forming humid water vapor. This water vapor rises and passes through the PTFE breathable membrane 31. This breathable membrane 31 possesses excellent air permeability, water repellency, and anti-sticking properties, completely blocking solid asphalt particles while allowing water vapor to pass through. It also prevents asphalt powder from adhering and is less prone to clogging. After penetrating the breathable membrane 31, the water vapor condenses into water droplets. The rotating rod 35 simultaneously drives the scraper 33 to rotate continuously, dynamically scraping and cleaning the surface of the breathable membrane 31, promptly removing the condensed water droplets. The water droplets collect and are discharged through the drain outlet 34 and drain pipe 8, effectively preventing the condensed water from falling back and re-wetting the asphalt particles, thus ensuring the optimal low-temperature drying effect.

[0044] After the low-temperature pretreatment and drying process of asphalt particles is completed, the equipment controls the discharge valve plate to flip open for unloading. During the flipping and rotating process, the discharge valve plate actively pushes the mixing frame 32, allowing the mixing frame 32 to overcome the elastic force of the compression spring 37 and slide smoothly upward along the lifting groove 36, actively avoiding the flipping trajectory of the discharge valve plate, completely avoiding structural interference problems, and ensuring smooth opening and closing of the discharge valve plate and stable unloading operation. After unloading, the compression spring 37 elastically resets, pushing the mixing frame 32 down the lifting groove 36 to reset, returning to the normal mixing working position, waiting for the next batch of material drying operation. The dried asphalt particles are sent to the subsequent heating cylinder 4 for deep temperature adjustment through the feed pipe 16, completing the entire pretreatment process before asphalt recycling.

[0045] Example 3

[0046] A rotating shaft 38 is rotatably connected inside the heating cylinder 4. A spiral plate 39 is fixedly connected to the outer wall of the rotating shaft 38. A discharge hopper 42 is fixedly connected to the output port of the heating cylinder 4. A conveying pipe 43 is fixedly connected to the output end of the discharge hopper 42.

[0047] After being dehumidified at low temperature in the pretreatment cylinder 15, the asphalt particles are fed into the heating cylinder 4 for high-temperature heating and conditioning. Under the high-temperature environment of the heating cylinder 4, the asphalt binder on the surface of the asphalt particles softens and melts, while the stone aggregate at the core of the particles remains in a solid matrix state, without overall melting or fluidization. This results in hot recycled aggregate with a uniformly molten asphalt film on the surface, which is the core raw material for the subsequent mixing and compounding of high-quality recycled mixtures in the mixing cylinder 3. During the material heating process, the rotating shaft 38 drives the spiral plate 39 to rotate continuously. The spiral plate 39 continuously tumbles, lifts, and disperses the accumulated asphalt particles, effectively increasing the contact area between each asphalt particle and the high-temperature hot airflow. This avoids uneven temperature accumulation, local overheating, or inadequate heating, significantly improving the overall heating uniformity and efficiency. Meanwhile, the spiral plate 39 has an axial continuous pushing function, which can smoothly and automatically push the asphalt material that has completed high-temperature conditioning in the cylinder to the outlet of the heating cylinder 4, fall into the discharge hopper 42, and finally be stably delivered through the conveying pipe 43 and accurately fed into the mixing cylinder 3 for fine mixing operation, realizing integrated continuous operation of heating, feeding and discharging, and ensuring the overall production continuity of the equipment.

[0048] Example 4

[0049] The support frame 2 is fixedly connected to the upper surface of the substrate 1. A mixing cylinder 3 is fixedly connected to the upper surface of the substrate 1. A hollow shaft 44 is rotatably connected to the center of the mixing cylinder 3. Multiple shearing blades 45 are evenly installed on the outer wall of the hollow shaft 44. A drive shaft 40 is coaxially installed inside the hollow shaft 44. A protective shell 48 is fixedly connected to the bottom end of the drive shaft 40. A rotary motor 49 is fixedly connected inside the protective shell 48. A first bevel gear 50 is fixedly connected to the output end of the rotary motor 49. Multiple shafts 51 are evenly installed around the protective shell 48. Spiral stirring blades 46 and a second bevel gear 41 are fixedly connected to both ends of the shafts 51. The teeth of the first bevel gear 50 mesh with the teeth of the second bevel gear 41. A discharge pipe 47 is fixedly connected to the bottom end of the mixing cylinder 3.

[0050] Two sets of servo motors are controlled to operate independently. One set of servo motors drives the hollow shaft 44 to rotate as a whole through a drive gear meshing with a gear ring. This causes multiple sets of shearing blades 45 on the outer side of the hollow shaft 44 to revolve synchronously, performing large-scale shearing, dispersing, and agitation on the asphalt mixture, breaking up material agglomeration. The other set of servo motors drives the drive shaft 40 and protective shell 48 to rotate independently through a drive gear meshing with the top gear of the drive shaft 40. This allows for differentiated speed and direction adjustments compared to the hollow shaft 44, adapting to different mixing conditions. Simultaneously, the rotating motor 49 inside the protective shell 48 continuously operates, driving the first bevel gear 50 to rotate. Through gear meshing, this drives multiple sets of circumferential second bevel gears 41 and shaft 51 to rotate, precisely adjusting the tilt angle and rotation posture of each spiral mixing blade 46 to meet the mixing needs of asphalt mixtures with different viscosities and particle sizes. The equipment utilizes the revolution shearing of shear blades 45 combined with the adjustable planetary mixing of spiral mixing blades 46 to create a multi-dimensional composite mixing flow field. This significantly improves the uniformity of the blending of new and old asphalt materials and recycling agents, avoiding problems such as mixture stratification and insufficient mixing. The finished recycled asphalt mixture is discharged through the bottom discharge pipe 47, achieving continuous and stable output.

[0051] The working principle of this invention is as follows: Waste asphalt is first fed into the crushing hopper 13, where it is initially crushed by paired crushing rollers 21 to obtain asphalt mixed particles with uneven particle size, which are then fed into the inclined shaking box 11. The drive motor 26 drives the eccentric block 27 to generate excitation force, which, together with the reset spring 23, causes the shaking box 11 to vibrate and screen at high frequency. Fine particles with qualified particle size pass through the screen holes and fall into the receiving hopper 20, and are then fed into the pretreatment cylinder 15 through the feed pipe 16 for pre-drying. Oversized large particles slide along the shaking box 11 into the second return cylinder 18, are fed into the first return cylinder 9 through the second spiral conveyor plate 19, and are then sent back to the crushing hopper 13 through the inclined pipe 14 by the first spiral conveyor plate 17, forming a closed-loop secondary crushing and screening. After qualified asphalt particles enter the pretreatment cylinder 15, low-temperature hot air is introduced into the heat exchanger 6 through the heat pipe 7. The rotating rod 35 drives the mixing frame 32 to turn the material. Water vapor rises through the breathable membrane 31 and condenses into water droplets. The synchronously rotating scraper 33 continuously scrapes off the condensate on the membrane surface. The condensate is discharged through the drain outlet 34 and the drain pipe 8. When drying and unloading, the discharge valve plate opens to push the mixing frame 32 up along the lifting groove 36 and compresses the compression spring 37 to achieve active avoidance. After unloading, the compression spring 37 drives the mixing frame 32 to return to its original position. The pre-dried aggregate is fed into the heating cylinder 4. The rotating shaft 38 drives the spiral plate 39 to tumble, lift and push the material axially. The conditioned hot recycled aggregate is fed into the mixing cylinder 3 through the discharge hopper 42 and the conveying pipe 43. The hollow shaft 44 drives the shearing blades 45 to revolve, performing large-scale shearing and breaking up of the mixture. The drive shaft 40 drives the protective shell 48 to rotate. In conjunction with the built-in rotating motor 49 and bevel gear transmission mechanism in the protective shell 48, multiple sets of shafts 51 and spiral mixing blades 46 are driven to achieve planetary mixing. Finally, the finished recycled asphalt mixture is continuously discharged from the bottom discharge pipe 47.

[0052] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-efficiency asphalt recycling production equipment, comprising a substrate (1), characterized in that: The substrate (1) is provided with a material return assembly and an auxiliary assembly. The material return assembly is used for secondary crushing of asphalt particles, and the auxiliary assembly is used for pre-drying of asphalt particles. The material return assembly includes a support frame (2), a shaking box (11), a first material return cylinder (9), and a second material return cylinder (18). Two connecting seats (22) are installed on both sides of the shaking box (11). Two side plates (10) are symmetrically installed on the upper surface of the support frame (2). Two return springs (23) are installed at the upper end of each side plate (10). The return springs (23) are fixedly connected to the connecting seats (22). The shaking box (11) is inclined. Multiple evenly distributed openings are provided on the bottom wall of the shaking box (11). The sieve hole, the side wall of the shaking box (11) is fixedly connected to a drive motor (26), the output end of the drive motor (26) is fixedly connected to an eccentric block (27), the drive motor (26) drives the eccentric block (27) to rotate, so that the shaking box (11) screens asphalt particles, the feed port of the second return cylinder (18) is located below the output end of the shaking box (11), the second return cylinder (18) is rotatably connected to a second spiral conveyor plate (19), and the first return cylinder (9) is connected to the second return cylinder (18); The auxiliary components include a heat exchanger (6) and a pretreatment cylinder (15). A heat pipe (7) is fixedly connected to the output end of the heat exchanger (6). The end of the heat pipe (7) away from the heat exchanger (6) is located inside the pretreatment cylinder (15). A rotating rod (35) is rotatably connected to the center of the pretreatment cylinder (15). A stirring rack (32) is slidably connected to the outer wall of the rotating rod (35). A breathable membrane (31) is fixedly connected to the inner wall of the pretreatment cylinder (15). The breathable membrane (31) is located above the stirring rack (32). A scraper (33) is fixedly connected to the outer wall of the rotating rod (35). The scraper (33) abuts against the upper surface of the breathable membrane (31). The rotating rod (35) rotates to drive the scraper (33) to rotate, so that the scraper (33) scrapes off the water droplets on the upper surface of the breathable membrane (31).

2. The high-efficiency asphalt recycling production equipment according to claim 1, characterized in that: The support frame (2) is fixedly connected to the upper surface of the substrate (1). A mixing cylinder (3) is fixedly connected to the upper surface of the substrate (1). A hollow shaft (44) is rotatably connected to the center of the mixing cylinder (3). Multiple shear blades (45) are evenly installed on the outer wall of the hollow shaft (44). A drive shaft (40) is coaxially installed inside the hollow shaft (44). A protective shell (48) is fixedly connected to the bottom end of the drive shaft (40).

3. The high-efficiency asphalt recycling production equipment according to claim 2, characterized in that: A rotating motor (49) is fixedly connected inside the protective shell (48). A first bevel gear (50) is fixedly connected to the output end of the rotating motor (49). Multiple shafts (51) are evenly installed in the protective shell (48) along the circumference. Spiral stirring blades (46) and a second bevel gear (41) are fixedly connected to both ends of the shafts (51). The teeth of the first bevel gear (50) mesh with the teeth of the second bevel gear (41).

4. The high-efficiency asphalt recycling production equipment according to claim 1, characterized in that: The inner side wall of the shaking box (11) is provided with an installation groove (24), a slide rail (25) is fixedly connected in the installation groove (24), a threaded seat (30) is slidably connected in the slide rail (25), a threaded rod (29) is rotatably connected in the slide rail (25), the threaded rod (29) is threadedly connected to the threaded seat (30), and a brush plate (28) is fixedly connected to the end of the threaded seat (30) away from the slide rail (25).

5. The high-efficiency asphalt recycling production equipment according to claim 1, characterized in that: The upper surface of the support frame (2) is fixedly connected to the mounting frame (12), the heating cylinder (4), and the exhaust gas purification box (5). The mounting frame (12) is fixedly connected to the crushing bucket (13). Two crushing rollers (21) are symmetrically installed inside the crushing bucket (13). The first spiral conveyor plate (17) is rotatably connected inside the first return cylinder (9). The outer wall of the first return cylinder (9) is fixedly connected to the inclined pipe (14). The output end of the inclined pipe (14) is located above the crushing bucket (13).

6. The high-efficiency asphalt recycling production equipment according to claim 1, characterized in that: A receiving hopper (20) is fixedly connected between the two side plates (10), and a feed pipe (16) is fixedly connected to the output end of the receiving hopper (20). The receiving hopper (20) and the pretreatment cylinder (15) are connected through the feed pipe (16).

7. The high-efficiency asphalt recycling production equipment according to claim 1, characterized in that: The rotating rod (35) has a lifting groove (36) inside. The stirring frame (32) is slidably connected to the lifting groove (36). A compression spring (37) is installed inside the lifting groove (36). A drain pipe (8) is fixedly connected to the outer wall of the pretreatment cylinder (15).

8. The high-efficiency asphalt recycling production equipment according to claim 5, characterized in that: The heating cylinder (4) is rotatably connected to a rotating shaft (38), and a spiral plate (39) is fixedly connected to the outer wall of the rotating shaft (38).

9. The high-efficiency asphalt recycling production equipment according to claim 8, characterized in that: The output port of the heating cylinder (4) is fixedly connected to the discharge hopper (42), and the output end of the discharge hopper (42) is fixedly connected to the conveying pipe (43).

10. The high-efficiency asphalt recycling production equipment according to claim 2, characterized in that: The bottom end of the mixing cylinder (3) is fixedly connected to a discharge pipe (47), and the outer wall of the pretreatment cylinder (15) is provided with a drain outlet (34).

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