Thermal regeneration device based on waste pavement asphalt and preparation method

Abstract

The invention relates to a thermal regeneration device based on waste pavement asphalt and a preparation method, the thermal regeneration device comprises a rack, a turnover frame is arranged on the rack, and the turnover frame is connected with a connecting cylinder through a rotating disc; one end of the connecting cylinder is fixedly connected with the inner cylinder, and the outer wall is sleeved with the stirring barrel for containing fine materials and coarse materials respectively; the connecting cylinder is provided with a filtering assembly to separate coarse and fine materials, the stirring barrel is provided with a heating assembly to circularly heat the coarse materials through jacket hot water, and waste heat is utilized to secondarily heat the fine materials; a material box and a pump body are arranged on one side of the rack and are matched with an asphalt spraying assembly with double spraying pipes to realize uniform spraying of an additive; the thermal regeneration device can realize separate heating of coarse and fine materials to improve regeneration quality, waste heat recovery reduces energy consumption, and is uniform in mixing, convenient to operate and suitable for being popularized on a road maintenance site.

Description

Technical Field

[0001] This invention belongs to the field of road construction technology and relates to a thermal recycling device and preparation method based on waste pavement asphalt. Background Technology

[0002] With the rapid development of highway transportation, asphalt pavement has been widely used in road construction both domestically and internationally due to its advantages such as driving comfort and convenient construction. However, under the long-term influence of vehicle loads and natural environmental factors (such as temperature changes and rainwater erosion), asphalt pavement is prone to various defects such as cracking, rutting, and potholes, requiring regular maintenance or resurfacing. The large amount of reclaimed asphalt pavement (RAP) generated during the resurfacing process, if directly discarded, not only occupies land resources but also wastes raw materials such as asphalt and aggregate, and pollutes the environment. Therefore, how to achieve efficient and environmentally friendly recycling of RAP has become an important research direction in the field of road engineering.

[0003] Currently, hot recycling technology is the mainstream method for recycling waste asphalt mixtures. Its core principle is to soften aged asphalt again through heating, then mix it with new asphalt, recycling agents, or new aggregates to form a recycled asphalt mixture that meets road performance requirements. Existing hot recycling equipment is mainly divided into two categories: plant-mixed hot recycling and on-site hot recycling. Plant-mixed hot recycling requires transporting the RAP material to a fixed mixing plant for processing. Although the recycling quality is easier to control, transportation costs are high and flexibility is insufficient. On-site hot recycling directly heats, mills, mixes, and paves the original road surface, eliminating material transfer. However, due to limitations in operating conditions, problems such as uneven heating and difficulty in guaranteeing mixing effects exist.

[0004] Although hot recycling technology is relatively mature, many technical bottlenecks still exist in practical applications. Existing equipment typically heats the RAP (Rich Asphalt Acrylic Acid) as a whole, but the thermal conductivity of RAP with different particle sizes varies significantly: fine particles have a large surface area and conduct heat quickly, easily leading to secondary aging of the asphalt due to overheating; coarse particles have slow internal heat conduction, often resulting in insufficient heating and inadequate softening, affecting the uniformity of the recycled material. This uneven heating leads to fluctuations in the quality of the recycled asphalt mixture, making it difficult to meet the requirements of high-grade roads. While a staged heating process can improve uniformity, it significantly reduces processing efficiency. Therefore, achieving a balance between ensuring heating quality and improving processing efficiency is a key issue that current hot recycling technology urgently needs to address. Summary of the Invention

[0005] In view of this, in order to solve the problems of uneven heating of coarse and fine materials, heat waste and poor mixing effect in on-site hot recycling RAP material devices, the present invention provides a hot recycling device and preparation method based on waste pavement asphalt. Through innovative heating process, it realizes differentiated heating of RAP materials with different particle sizes, ensuring the quality of recycled mixture while maintaining high processing efficiency.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A thermal recycling device based on waste road asphalt includes a frame, a rotatable tilting frame rotatably connected to the frame, a rotating disk rotatably connected to the tilting frame, and a connecting cylinder rotatably connected through one side of the rotating disk.

[0008] One end of the connecting cylinder is fixedly connected to an inner cylinder containing fine materials, and a mixing tank containing coarse materials is fixedly sleeved on the outer wall.

[0009] A feed hopper is fixedly connected to the tilting frame, and the feed hopper is rotatably sleeved on the connecting cylinder. A motor II is fixedly connected to the tilting frame, and the motor II is connected to the rotating disk for transmission. A filter assembly is provided on the connecting cylinder for separating coarse and fine materials to the inner cylinder and the mixing tank.

[0010] The mixing drum is equipped with a heating component for heating the coarse material and using its heat to heat the fine material in the inner cylinder; a material box is fixedly connected to one side of the frame, and a pump body I is fixedly connected to one side of the material box; an asphalt spraying component is installed in the mixing drum and the inner cylinder; the water inlet of the pump body I is connected to the material box through a pipe, and the drain end is connected to the asphalt spraying component.

[0011] As a further improvement to the above technical solution:

[0012] The filter assembly includes multiple rectangular holes opened on the outer wall of the connecting cylinder, and filter screens are fixedly connected inside the rectangular holes;

[0013] One end of the mixing tank has a feed inlet corresponding to the rectangular hole, and multiple guide strips I are fixedly connected to the outer wall of the connecting cylinder;

[0014] The material is guided by guide bar I. Fine material passes through the filter screen and enters the inner cylinder, while coarse material enters the mixing tank through the feed port. The rectangular hole and guide bar I are both located inside the feed hopper.

[0015] As a further improvement to the above technical solution:

[0016] A motor I is fixedly connected to one side of the feed hopper, and the output end of motor I extends into the feed hopper and is fixedly fitted with a crushing blade;

[0017] Motor I drives the shredder blades to rotate, which is used to crush clumps of waste asphalt material so that the filter assembly can separate it.

[0018] As a further improvement to the above technical solution:

[0019] The heating assembly includes a jacket that is rotatably fitted on the outer wall of the mixing tank. A partition is fixedly connected inside the jacket to divide the gap inside the jacket into two circulation channels.

[0020] A heating boiler and a water tank are fixedly connected to the frame. A pump body II is fixedly connected to one side of the water tank. The water inlet of the pump body II is connected to the water tank, and the water outlet is connected to the heating boiler via a pipe.

[0021] Pump body III is fixedly connected to the top of the frame. The water inlet end of pump body III is connected to the heating boiler through a pipe, and the drain end is connected to the jacket through the water inlet pipe. A drain pipe is fixedly connected through one side of the jacket, and the other end of the drain pipe extends into the heating boiler to form a hot water circulation to heat the coarse material.

[0022] As a further improvement to the above technical solution:

[0023] A hot air pipe is connected through and fixedly to one side of the rotating disk, with one end of the hot air pipe extending into the inner cylinder.

[0024] An exhaust pipe is fixedly connected to the heating boiler. A fan is connected to the outer wall of the exhaust pipe, and the exhaust end of the fan is connected to the other end of the hot gas pipe.

[0025] The blower sends the hot air discharged from the exhaust pipe into the hot air pipe to reheat the fine material in the inner cylinder.

[0026] As a further improvement to the above technical solution:

[0027] The asphalt spraying assembly includes a spray pipe I that runs through and is fixed to one side of a hot air pipe. The outer wall of the spray pipe I is provided with multiple nozzles located inside the inner cylinder. One end is connected to the drainage end of the pump body I, and the other end is sealed.

[0028] One end of nozzle I is connected to nozzle II, which is located inside the mixing tank.

[0029] The additive is delivered to nozzles I and II via pump body I, and then sprayed onto the fine material in the inner cylinder and the coarse material in the mixing tank through the nozzles.

[0030] As a further improvement to the above technical solution:

[0031] One side of the tilting frame is rotatably connected to the machine frame, and a hydraulic cylinder is rotatably connected to the bottom of the machine frame. The output end of the hydraulic cylinder is rotatably connected to the tilting frame. A guide chute is fixedly connected to one side of the tilting frame.

[0032] The hydraulic cylinder extends and retracts to drive the tilting frame to tilt, and the mixed recycled material is discharged through the guide chute.

[0033] As a further improvement to the above technical solution:

[0034] A support base is fixedly connected to the outer wall of nozzle I, and a support wheel II is rotatably connected to one side of the support base. The support wheel II abuts against the inner wall of the inner cylinder.

[0035] When the inner cylinder rotates, the support wheel II rolls along it, providing auxiliary support to the nozzle I to prevent deformation.

[0036] As a further improvement to the above technical solution:

[0037] The tilting frame is fixedly connected to a bracket by bolts, and multiple protective covers are bolted to the outside of the bracket to protect the motor II, rotating disk and other components on the tilting frame.

[0038] Furthermore, the bottom of the frame is equipped with casters, making it easy to move the device to the construction area.

[0039] The method for preparing waste pavement asphalt thermal recycling, applied to the aforementioned waste pavement asphalt thermal recycling device, includes the following steps:

[0040] S1. Feeding and crushing: Waste asphalt material is fed into the feed hopper by conveyor or manually, and motor I is started to drive the crushing blade to crush the lumpy material.

[0041] S2. Coarse and fine separation: Start motor II, which drives the rotating disc and connecting cylinder to rotate via synchronous pulley and synchronous belt. The material is guided by guide bar I. Fine material passes through the filter screen and enters the inner cylinder, while coarse material enters the mixing tank through the feed port.

[0042] S3. Heating: Start the heating components. Pump body II sends water from the water tank to the heating boiler for heating. Pump body III sends hot water into the jacket to heat the coarse material. At the same time, the blower sends hot air from the exhaust pipe into the hot air pipe for secondary heating of the fine material.

[0043] S4. Spraying and mixing: Start pump body I and spray the additive in the material box onto the coarse and fine materials through spray pipe I and spray pipe II. The inner cylinder and mixing tank rotate to achieve uniform mixing.

[0044] S5. Discharge: Control the hydraulic cylinder to extend and retract to drive the tilting frame to tilt, open the inner cylinder discharge port baffle, and the recycled material is discharged through the guide chute.

[0045] The beneficial effects of this invention are as follows:

[0046] 1. The thermal recycling device based on waste pavement asphalt disclosed in this invention separates the fine and coarse materials in the waste asphalt material through a filter component. The fine material enters the inner cylinder, and the coarse material enters the mixing tank. Both are heated separately. This separate heating method can avoid the problems of fine material being prone to overheating and aging due to its large surface area and coarse material being prone to insufficient heating due to its slow heat conduction when mixed heating is used in traditional methods. It ensures that both fine and coarse materials can reach a suitable recycling temperature, thereby ensuring the performance stability of the recycled asphalt mixture. Moreover, the heat in the mixing tank can heat the material in the inner cylinder without the need for additional heat energy.

[0047] 2. The thermal recycling device based on waste road asphalt disclosed in this invention heats the coarse material in the mixing tank through hot water circulation in the jacket of the heating component, and at the same time uses the hot air discharged from the heating boiler to heat the fine material in the inner cylinder for a second time through the hot air pipe, realizing the full recovery and utilization of waste heat. Compared with the traditional method of heating with only a single heat source, this design reduces heat waste, significantly improves thermal efficiency, and reduces energy consumption per unit processing volume.

[0048] 3. The hot recycling device based on waste pavement asphalt disclosed in this invention has an inner cylinder and a mixing tank that rotate synchronously with the connecting cylinder, causing the internal materials to continuously tumble. At the same time, the asphalt spraying assembly sprays asphalt or recycling agent into the materials in the inner cylinder and the mixing tank through spray pipe I and spray pipe II respectively. The atomizing nozzle can evenly disperse the additives. Combined with the tumbling of the materials, it can ensure that the additives are fully contacted and mixed with the fine and coarse materials, avoiding the problem of excessive or insufficient additives in some areas, and improving the uniformity of the recycled material.

[0049] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0050] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0051] Figure 1 This is a three-dimensional structural schematic diagram of the thermal recycling device for waste road asphalt according to the present invention;

[0052] Figure 2 For the present invention Figure 1 A schematic diagram of the structure without the protective cover;

[0053] Figure 3 This is a schematic diagram of the filter component structure in this invention;

[0054] Figure 4 This is a schematic diagram of the exploded structure of the feed hopper in this invention;

[0055] Figure 5 This is a cross-sectional view of the mixing tank and inner cylinder in this invention;

[0056] Figure 6 This is a schematic diagram of the structure of nozzle I and nozzle II in this invention;

[0057] Figure 7 This is a schematic diagram of the installation positions of pump body I, pump body II, and pump body III in this invention;

[0058] Figure 8 This is a schematic diagram of the connection structure between the tilting frame and the machine frame in this invention;

[0059] Figure 9 This is a cross-sectional view of the jacket in this invention.

[0060] Reference numerals: 1. Frame; 2. Control cabinet; 3. Roller; 4. Protective cover; 5. Feed hopper; 51. Crushing blade; 52. Motor I; 6. Heating boiler; 61. Exhaust pipe; 7. Water tank; 8. Material box; 9. Mixing tank; 10. Support frame; 11. Support wheel I; 12. Pump body I; 13. Rotating disc; 14. Connecting cylinder; 15. Guide bar I; 16. Rectangular hole; 17. Filter screen; 18. Feed inlet; 9. Hot air pipe; 20. Nozzle I; 21. Motor II; 22. Synchronous pulley; 23. Synchronous belt; 24. Inner cylinder; 25. Guide bar II; 26. Raised bar; 27. Nozzle II; 28. Support base; 29. ​​Support wheel II; 30. Jacket; 31. Fan; 32. Pump body II; 33. Pump body III; 34. Hydraulic cylinder; 35. Material guide chute; 36. Tilting frame; 37. Drain pipe; 38. Water inlet pipe; 39. Baffle plate. Detailed Implementation

[0061] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0062] like Figure 1 The thermal recycling device based on waste pavement asphalt shown is mainly used for the recycling and regeneration of waste pavement asphalt. It can achieve separate heating and uniform mixing of fine and coarse materials, and at the same time make full use of heat to improve thermal efficiency. The specific structure and working process of the device are described in detail below.

[0063] The hot recycling device based on waste asphalt pavement is supported by a frame 1, which is welded from steel plates and has an overall frame structure. It consists of crisscrossing beams and columns, which are fixed to each other by welding. Triangular reinforcing plates are added at the joints to enhance stability. Two rollers 3 are installed at the bottom, and one end can be connected to equipment such as a tractor for movement to the construction area. A control cabinet 2 is fixed to the top of one side of the frame 1 to control the electrical components of the device. Figure 2The tilting frame 36 shown is located on the upper part of the frame 1. One side of the tilting frame 36 is rotatably connected to the ear plate on the top of the frame 1 through two parallel pins. The pins are equipped with end retaining rings to prevent them from falling off. A deep groove ball bearing is installed between the pin and the ear plate. The inner ring of the bearing is interference-fitted with the pin, and the outer ring is clearance-fitted with the ear plate, which can greatly reduce friction during rotation and make the tilting action of the tilting frame 36 smoother. The tilting action of the tilting frame 36 is driven by the hydraulic cylinder 34. The bottom of the cylinder body of the hydraulic cylinder 34 is rotatably connected to the ear plate at the bottom of the frame 1 through a pin. The top of the piston rod of the hydraulic cylinder 34 is rotatably connected to the ear plate in the middle of the tilting frame 36 through a pin. The hydraulic cylinder 34 is powered by the hydraulic station of the tractor. The hydraulic station is equipped with a control valve to adjust the extension and retraction speed of the hydraulic cylinder 34. When the hydraulic cylinder 34 extends and retracts, it can drive the tilting frame 36 to rotate around the pin connected to the frame 1. The tilting frame 36 is also equipped with a limit block to prevent the tilting angle from being too large, so as to facilitate the smooth discharge of the mixed recycled material in the inner cylinder 24 and the mixing tank 9. The tilting frame 36 is also bolted to the bracket 10. Multiple protective covers 4 are bolted to the outside of the bracket 10 to protect the internal components. Two support wheels I11 are fixedly provided on the top of the tilting frame 36 for supporting the mixing tank 9.

[0064] like Figure 3 , 5 The rotating disk 13 shown is mounted on the side of the tilting frame 36 away from the pin shaft via a bearing seat. The bearing seat is fixed to the crossbeam of the tilting frame 36 by multiple bolts, which are evenly distributed around the bearing seat to ensure a firm fixation. A circular through hole is opened in the center of the rotating disk 13. The connecting cylinder 14 passes through this circular through hole and is fixed to the rotating disk 13 by a flat key and welding. The flat key is embedded in the keyway on the outer wall of the connecting cylinder 14 and the keyway on the inner wall of the through hole of the rotating disk 13, so that the rotating disk 13 can stably drive the connecting cylinder 14 to rotate synchronously when rotating, avoiding relative slippage.

[0065] The connecting cylinder 14 is made of stainless steel tubing. Stainless steel is corrosion-resistant and high-temperature resistant, making it suitable for long-term contact with asphalt materials. One end of the connecting cylinder 14 is welded to an inner cylinder 24, which is also made of stainless steel and is conical in shape. The hollow interior is used to hold fine materials. The end away from the connecting cylinder 14 has a discharge port, which is equipped with a movable baffle (not shown in the figure). The baffle is connected to the outer wall of the inner cylinder 24 by a hinge. The baffle is also equipped with a buckle, which can cooperate with the locking block on the inner cylinder 24 to fix it, making it convenient to control the timing and speed of fine material discharge. The inner wall of the inner cylinder 24 is also fixed with multiple guide strips II 25, which are used to turn the material during the turning process. The mixing drum 9 is fixedly fitted onto the outer wall of the connecting cylinder 14 by welding. The mixing drum 9 is located on the side of the connecting cylinder 14 near the rotating disk 13. Its inner diameter is larger than that of the inner cylinder 24. The interior is hollow and used to hold coarse materials. The side wall of the mixing drum 9 is provided with a feed inlet 18 at the end near the rotating disk 13. The feed inlet 18 is rectangular and its position corresponds to the rectangular hole 16 on the connecting cylinder 14 to ensure that the coarse materials can enter the mixing drum 9 smoothly. The inner wall of the mixing drum 9 is also fixed with multiple protrusions 26. During the rotation of the mixing drum 9, the protrusions 26 are used to move the material, so that the material is heated evenly.

[0066] like Figure 4 The feed hopper 5 shown is fixed to the tilting frame 36 by a bracket welded to the crossbeam of the tilting frame 36. The bracket is triangular in shape to enhance support stability. The upper part of the feed hopper 5 has a square opening, which gradually widens at the bottom. The bottom opening is fitted onto the outer wall of the connecting cylinder 14. A sealing ring is installed between the opening and the connecting cylinder 14. The sealing ring is made of heat-resistant silicone material, which ensures that the connecting cylinder 14 can rotate freely and effectively prevents material from leaking out from the gap. The motor II 21 is fixed to one side of the tilting frame 36 by a motor mount. The motor mount is connected to the tilting frame 36 by bolts. A rubber pad is also placed at the bottom of the motor mount to reduce vibration. A synchronous pulley 22 is installed on the output shaft of the motor II 21. A synchronous pulley 22 is also installed on the edge of the rotating disk 13. The two synchronous pulleys 22 are connected by a synchronous belt 23. The synchronous belt 23 is made of polyurethane and has a toothed structure on its surface that meshes with the synchronous pulleys 22. This allows the power of the motor II 21 to be stably transmitted to the rotating disk 13, driving the connecting cylinder 14 and other components to rotate.

[0067] The filter assembly on the connecting cylinder 14 is used to separate fine and coarse materials. Specifically, multiple rectangular holes 16 are evenly distributed along the circumference on the outer wall of the connecting cylinder 14 near the feed hopper 5. Each rectangular hole 16 contains a filter screen 17 made of stainless steel, which is doubly fixed to the connecting cylinder 14 by welding and bolts to prevent it from falling off after long-term use. The mesh size of the filter screen 17 is large enough to block coarse materials from passing through while allowing fine materials to pass through, thus achieving the separation of coarse and fine materials. The guide bar I 15 is a long, spiral-shaped stainless steel plate, which is fixed to the outer wall of the connecting cylinder 14 by welding. One guide bar I 15 is set on each side of each rectangular hole 16. The guide bar I 15 forms a certain angle with the axis of the connecting cylinder 14. When the connecting cylinder 14 rotates, the guide bar I 15 can move the material in the feed hopper 5 towards the rectangular hole 16 like a scraper, helping the material pass through the filter screen 17 or enter the feed inlet 18, thereby improving the separation efficiency.

[0068] A structure for crushing materials is also provided on one side of the feed hopper 5. Specifically, a thick mounting plate is welded to the side of the feed hopper 5, and the motor I 52 is fixed to the mounting plate with bolts. Sufficient bolts ensure that the motor I 52 does not shake during operation. The output shaft of the motor I 52 passes through the side wall of the feed hopper 5 and extends into the interior of the feed hopper 5. The crushing blade 51 is a spiral blade, which is welded and fixed to the output shaft of the motor I 52 located inside the feed hopper 5. The spiral direction of the crushing blade 51 is consistent with the direction of material falling. When the motor I 52 starts, the crushing blade 51 rotates at high speed, which can crush the lumpy materials entering the feed hopper 5, breaking large pieces of material into small particles. The crushed material is more easily separated into coarse and fine particles by the filter assembly.

[0069] The heating components are arranged around the mixing tank 9. The jacket 30 is a double-layered stainless steel structure, cylindrical in shape, and is rotatably fitted onto the outer wall of the mixing tank 9 via bearings. The jacket 30 fits snugly against the mixing tank 9 without affecting its rotation. Figure 9 The partition 39 shown is made of stainless steel and is fixed inside the jacket 30 by welding. The partition 39 is arranged along the axial direction of the jacket 30, dividing the gap inside the jacket 30 into individual independent channels. This allows hot water to flow from bottom to top within the jacket 30, preventing local accumulation of hot water and improving the heating uniformity of the mixing tank 9. The heating boiler 6 and the water tank 7 are both fixed to one side of the frame 1 by brackets. The heating boiler 6 is a pressurized hot water boiler that can heat water to the required temperature to meet the heating needs of the coarse materials in the mixing tank 9. The water tank 7 is made of stainless steel and is used to store softened water to be heated. The top of the water tank 7 has a covered water inlet for easy water filling, and the bottom has a drain outlet to periodically remove sediment from the tank.

[0070] like Figure 7Pump body II 32 is bolted to one side of water tank 7. The inlet of pump body II 32 is connected to the outlet at the bottom of water tank 7 via a hose. The outlet is connected to a pipe via a flange, and the other end of the pipe is connected to the inlet of heating boiler 6. A heat-resistant rubber gasket is installed at the flange connection to prevent leakage. Pump body II 32 stably delivers water from water tank 7 to heating boiler 6. Pump body III 33 is fixed to the top of frame 1 by a bracket. Its inlet is connected to the outlet of heating boiler 6 via a pipe, and its outlet is connected to an inlet of jacket 30 via inlet pipe 38. Inlet pipe 38 is a stainless steel pipe connected to jacket 30 via a flange. An outlet is located on the other side of jacket 30. One end of drain pipe 37 is connected to this outlet via a flange, and the other end extends to the return port of heating boiler 6, forming a closed hot water circulation loop. This allows the hot water in jacket 30 to flow back to heating boiler 6 for reheating after heating, reducing heat waste.

[0071] A hot air pipe 19 is also fixed through one side of the rotating disk 13. The hot air pipe 19 is a stainless steel pipe, one end of which passes through the central hole of the rotating disk 13 and is fixed by welding, and the other end extends to the middle of the inner cylinder 24. The part of the hot air pipe 19 inside the inner cylinder 24 has multiple vent holes, which are evenly distributed around the pipe wall to facilitate the even distribution of hot air to all corners of the inner cylinder 24. The top of the heating boiler 6 is equipped with an exhaust pipe 61, which is also made of stainless steel. The air inlet of the blower 31 is connected to the exhaust pipe 61 through a flexible hose. The blower 31 is fixed to the frame 1 by a bracket. The air outlet of the blower 31 is connected to the end of the hot air pipe 19 away from the inner cylinder 24 through a flexible hose. When the heating boiler 6 is working, the hot air discharged is drawn into the hot air pipe 19 by the blower 31 and transported to the hot air pipe 19, and finally enters the inner cylinder 24 to reheat the fine materials. This not only improves the heating efficiency of the fine materials, but also makes full use of the waste heat discharged from the boiler, thus saving energy.

[0072] Material box 8 is fixed to one side of frame 1 by a bracket. Material box 8 is made of stainless steel and is used to store asphalt and recycling agent. The top of material box 8 has a covered feeding port to prevent foreign matter from entering, and the bottom has a discharge port to facilitate material flow. Pump body I 12 is fixed to one side of material box 8 by bolts. Pump body I 12 is a gear pump, suitable for conveying viscous asphalt or recycling agent. Its water inlet is connected to the discharge port at the bottom of material box 8 through a hose, and its water outlet is connected to the asphalt spraying assembly through a pipe. The spray pipe I 20 in the asphalt spraying assembly is a stainless steel pipe, which is fixed to one side of hot air pipe 19 by pipe clamps. The pipe clamps are welded to hot air pipe 19. One end of spray pipe I 20 is connected to the water outlet of pump body I 12 through a hose, and the other end is sealed. The part of spray pipe I 20 located inside inner cylinder 24 is evenly equipped with multiple atomizing nozzles. The spray direction of the atomizing nozzles is towards the inner wall of inner cylinder 24 to ensure that asphalt or recycling agent can be evenly sprayed onto the fine material in a mist form. Figure 6The nozzle II27 shown is a branch pipe. One end is connected to the end of nozzle I20 away from pump body I12 via a tee, and the other end extends into the interior of mixing tank 9. The part of nozzle II27 located inside mixing tank 9 is also equipped with multiple atomizing nozzles, which are used to spray asphalt or recycling agent onto the coarse material to ensure that both coarse and fine materials are fully mixed with the additive.

[0073] like Figure 8 The guide trough 35 shown is a U-shaped structure made of welded steel plate. It is fixed to the side of the tilting frame 36 near the discharge end of the inner cylinder 24 and the mixing tank 9 by a bracket. One end of the guide trough 35 corresponds to the discharge port of the inner cylinder 24 and the mixing tank 9, and the other end extends to the outside of the device. The inner wall of the guide trough 35 is polished smooth to reduce material residue and facilitate the guidance of the discharged recycled material into subsequent conveying equipment or containers.

[0074] A support seat 28 is also fixed to the outer wall of the nozzle I 20. The support seat 28 is an L-shaped steel plate, which is welded to the side of the nozzle I 20 near the inner wall of the inner cylinder 24. A support wheel II 29 is installed on one side of the support seat 28 through a pin and a bearing. The support wheel II 29 is made of wear-resistant material, and its outer wall is in contact with the inner wall of the inner cylinder 24. When the inner cylinder 24 rotates with the connecting cylinder 14, the support wheel II 29 can roll along the inner wall of the inner cylinder 24, which plays an auxiliary support role for the nozzle I 20, preventing the nozzle I 20 from deforming or shifting due to vibration during long-term use, and ensuring the stability of the nozzle's spray position.

[0075] The working process of the thermal recycling device based on waste road asphalt is as follows: Waste asphalt material is fed into the feed hopper 5 by a conveyor or manually. The opening at the top of the feed hopper 5 is relatively large to facilitate material feeding. Motor I 52 is started, which drives the crushing blade 51 to rotate, crushing the lumpy waste asphalt material into small particles. At the same time, motor II 21 is started, which drives the rotating disk 13 to rotate through the synchronous pulley 22 and synchronous belt 23. The rotating disk 13 drives the connecting cylinder 14, inner cylinder 24 and mixing tank 9 to rotate synchronously. The crushed material falls naturally in the feed hopper 5. Guided by the guide bar I 15, the fine material enters the interior of the connecting cylinder 14 through the rectangular hole 16 and the filter screen 17, and then enters the inner cylinder 24 from the connecting cylinder 14. The coarse material enters the interior of the mixing tank 9 through the feed port 18, realizing the separation of coarse and fine materials.

[0076] When the heating assembly is started, pump body II 32 transports water from water tank 7 to heating boiler 6. After heating boiler 6 heats the water, pump body III 33 transports the hot water through inlet pipe 38 to jacket 30. The hot water circulates in jacket 30 along the channels separated by partition 39, continuously heating the coarse material in mixing tank 9. The heated hot water flows back to heating boiler 6 through drain pipe 37 for reheating, forming a stable heating cycle. During the heat dissipation process in mixing tank 9, the material in inner cylinder 24 can be heated.

[0077] When the material in the inner cylinder 24 heats up slowly, the blower 31 is started at the same time. The blower 31 delivers the hot air discharged from the exhaust pipe 61 of the heating boiler 6 to the hot air pipe 19. The hot air enters the inner cylinder 24 evenly through the vent holes on the hot air pipe 19 to reheat the fine material, so that both the fine and coarse materials can reach a temperature suitable for regeneration.

[0078] Pump body I12 is started, and it delivers the asphalt or recycling agent from material tank 8 to nozzles I20 and II27. The asphalt or recycling agent is then sprayed onto the fine material in inner cylinder 24 and the coarse material in mixing tank 9 via atomizing nozzles. The continuous rotation of inner cylinder 24 and mixing tank 9 causes the materials inside to tumble, ensuring thorough contact and uniform mixing of the asphalt or recycling agent. After mixing, the hydraulic cylinder 34 is extended or retracted via the hydraulic station, causing the tilting frame 36 to tilt to a suitable angle. This opens the movable baffle at the outlet of inner cylinder 24, allowing the mixed recycled material to fall into the guide chute 35 under gravity. The material is then transported along the guide chute 35 to external equipment, completing one cycle of waste asphalt recycling.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A thermal recycling device based on waste pavement asphalt, characterized in that, A rotatable tilting frame (36) is rotatably connected to the frame (1), and a rotating disk (13) is rotatably connected to the tilting frame (36). A connecting cylinder (14) is rotatably connected through one side of the rotating disk (13). An inner cylinder (24) for containing fine materials is fixedly connected to one end of the connecting cylinder (14), and a mixing tank (9) for containing coarse materials is fixedly sleeved on the outer wall. A feed hopper (5) is fixedly connected to the tilting frame (36), and the feed hopper (5) is rotatably sleeved on the connecting cylinder (14). A motor II (21) is fixedly connected to the tilting frame (36), and the motor II (21) is connected to the rotating disk (13) for transmission. A filter assembly is provided on the connecting cylinder (14) for separating coarse and fine materials to the inner cylinder (24) and the mixing tank (9). The mixing tank (9) is equipped with a heating component for heating the coarse material and using its heat to heat the fine material in the inner cylinder (24); A material box (8) is fixedly connected to one side of the frame (1), and a pump body I (12) is fixedly connected to one side of the material box (8). An asphalt spraying assembly is installed in the mixing tank (9) and the inner cylinder (24). The water inlet of the pump body I (12) is connected to the material box (8), and the drain end is connected to the asphalt spraying assembly.

2. The thermal recycling device based on waste pavement asphalt as described in claim 1, characterized in that, The filter assembly includes multiple rectangular holes (16) on the outer wall of the connecting cylinder (14) and a filter screen (17) fixedly connected in the rectangular holes (16); one end of the mixing tank (9) is provided with a feed inlet (18) corresponding to the rectangular holes (16), and multiple guide strips I (15) are fixedly connected to the outer wall of the connecting cylinder (14); the material is guided by the guide strips I (15), the fine material passes through the filter screen (17) and enters the inner cylinder (24), and the coarse material enters the mixing tank (9) through the feed inlet (18). The rectangular holes (16) and the guide strips I (15) are both located in the feed hopper (5).

3. The thermal recycling device based on waste pavement asphalt as described in claim 2, characterized in that, A motor I (52) is fixedly connected to one side of the feed hopper (5). The output end of the motor I (52) extends into the feed hopper (5) and is fixedly fitted with a crushing blade (51). The motor I (52) drives the crushing blade (51) to rotate, which is used to crush the clumps of waste asphalt.

4. The thermal recycling device based on waste pavement asphalt as described in claim 3, characterized in that, The heating assembly includes a jacket (30) that is rotatably fitted on the outer wall of the mixing tank (9). A partition (39) is fixedly connected inside the jacket (30) to divide the gap inside the jacket (30) into two circulation channels. A heating boiler (6) and a water tank (7) are fixedly connected on the frame (1). A pump body II (32) is fixedly connected to one side of the water tank (7). The water inlet end of the pump body II (32) is connected to the water tank (7), and the drain end is connected to the heating boiler (6) through a pipe. A pump body III (33) is fixedly connected to the top of the frame (1). The water inlet end of the pump body III (33) is connected to the heating boiler (6) through a pipe, and the drain end is connected to the jacket (30) through a water inlet pipe (38). A drain pipe (37) is fixedly connected through one side of the jacket (30), and the other end of the drain pipe (37) extends into the heating boiler (6) to form a hot water circulation to heat the coarse material.

5. The thermal recycling device based on waste pavement asphalt as described in claim 4, characterized in that, A hot air pipe (19) is fixedly connected to one side of the rotating disk (13), and one end of the hot air pipe (19) extends into the inner cylinder (24); an exhaust pipe (61) is fixedly connected to the heating boiler (6), and a fan (31) is connected to the outer wall of the exhaust pipe (61). The exhaust end of the fan (31) is connected to the other end of the hot air pipe (19); the fan (31) sends the hot air discharged from the exhaust pipe (61) into the hot air pipe (19) to reheat the fine material in the inner cylinder (24).

6. The thermal recycling device based on waste pavement asphalt as described in claim 5, characterized in that, The asphalt spraying assembly includes a spray pipe I (20) that runs through and is fixed to one side of the hot air pipe (19). The outer wall of the spray pipe I (20) is provided with multiple nozzles located inside the inner cylinder (24). One end of the spray pipe I (20) is connected to the drainage end of the pump body I (12), and the other end is sealed. The outer wall of the spray pipe I (20) is connected to a spray pipe II (27), which is located inside the mixing tank (9). The additive is transported to the spray pipe I (20) and the spray pipe II (27) via the pump body I (12), and sprayed onto the fine material in the inner cylinder (24) and the coarse material in the mixing tank (9) through the nozzles.

7. The thermal recycling device based on waste pavement asphalt as described in claim 6, characterized in that, The flipping frame (36) is rotatably connected to the frame (1) on one side. A hydraulic cylinder (34) is rotatably connected to the bottom of the frame (1). The output end of the hydraulic cylinder (34) is rotatably connected to the flipping frame (36). A guide trough (35) is fixedly connected to one side of the flipping frame (36). The hydraulic cylinder (34) extends and retracts to drive the flipping frame (36) to flip. The mixed recycled material is discharged through the guide trough (35).

8. The thermal recycling device based on waste pavement asphalt as described in claim 6, characterized in that, The outer wall of the nozzle I (20) is fixedly connected to a support seat (28), and a support wheel II (29) is rotatably connected to one side of the support seat (28). The support wheel II (29) abuts against the inner wall of the inner cylinder (24). When the inner cylinder (24) rotates, the support wheel II (29) rolls along the roller to provide auxiliary support for the nozzle I (20) to prevent deformation.

9. The thermal recycling device based on waste pavement asphalt as described in claim 1, characterized in that, The tilting frame (36) is fixedly connected to a bracket (10) by bolts. Multiple protective covers (4) are connected to the outside of the bracket (10) by bolts. Rollers (3) are installed at the bottom of the frame (1).

10. The method for preparing waste pavement asphalt thermal recycling based on the waste pavement asphalt thermal recycling device as described in claim 7, characterized in that, Includes the following steps: S1. Feeding and crushing: Waste asphalt material is fed into the feed hopper (5) by conveyor or manual operation, and motor I (52) is started to drive the crushing blade (51) to crush the lumpy material; S2, coarse and fine separation: Start motor II (21), drive the rotating disk (13) and connecting cylinder (14) to rotate through the synchronous belt. The material is guided by guide bar I (15). Fine material passes through filter screen (17) and enters inner cylinder (24), while coarse material enters mixing tank (9) through feed port (18). S3, Heating: Start the heating assembly. Pump body II (32) sends water from the water tank (7) into the heating boiler (6) for heating. Pump body III (33) sends hot water into the jacket (30) to heat the coarse material. At the same time, the blower (31) sends the hot air from the exhaust pipe (61) into the hot air pipe (19) for secondary heating of the fine material. S4, Spraying and mixing: Start pump body I (12) and spray the additive in material box (8) through spray pipe I (20) and spray pipe II (27) to coarse and fine materials. The inner cylinder (24) and the mixing tank (9) rotate to achieve uniform mixing. S5. Discharge: Control the hydraulic cylinder (34) to extend and drive the tilting frame (36) to tilt, open the inner cylinder (24) discharge port baffle, and the recycled material is discharged through the guide chute (35).

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