A mixing and blending device and method for waste asphalt mixture

Abstract

The application belongs to the technical field of asphalt blending, and particularly relates to a mixing and blending device and method for waste asphalt mixture, which aims at solving the problems of poor linkage, large energy consumption, low screening and mixing efficiency of traditional devices, and comprises a screening box, a material conveying cylinder, a mixing kettle and the like; the screening structure drives the moving plate and the screen to reciprocatingly move for screening asphalt through components such as a reciprocating screw in the driving structure; the mixing structure is linked with the driving structure through components such as a sliding rod and a pin rod II, controls the lifting of the sliding cylinder, and stirs at different heights; the device combines the driving, screening and mixing structures, reduces the use of power sources, solves the problems of low screening and mixing efficiency of traditional devices, and is used for the blending of waste asphalt mixture.

Description

Technical Field

[0001] This invention relates to the field of asphalt blending technology, and in particular to a mixing and blending device and method for waste asphalt mixtures. Background Technology

[0002] In current road maintenance projects, the recycling and reuse of waste asphalt mixtures has become an important direction for energy conservation and environmental protection. Existing waste asphalt mixing equipment generally suffers from the following problems: 1. The screening and mixing of crushed asphalt are mostly driven by individual drive sources, resulting in poor linkage between equipment, leading to high energy consumption and high equipment costs. 2. In the screening of crushed asphalt, the screens are basically fixed by bolts, which results in insufficient screening effect when screening oversized particles and impurities. 3. During mixing, the mixing components are fixed at the same horizontal depth, making it difficult to fully mix raw materials at different depths in the mixing tank. This results in low mixing efficiency and affects the quality and efficiency of waste asphalt mixture preparation. Summary of the Invention

[0003] This invention provides a mixing and blending device and method for waste asphalt mixtures, aiming to achieve efficient recycling through a simplified linkage mechanism. The device includes a screening box with a crusher at its top for initial crushing of waste asphalt; a conveying cylinder positioned below the screening box and connected via a feed pipe for conveying the screened material; and a mixing vessel located on one side of the screening box and connected to the conveying cylinder via a nozzle for final mixing.

[0004] This invention aims to reduce road maintenance costs by more than 20% while improving the quality and stability of recycled asphalt mixtures.

[0005] The development of this invention stems from the urgent need for recycling waste asphalt mixtures in road maintenance projects. With increasing global environmental awareness and the growing prominence of resource scarcity, traditional asphalt mixture production methods face severe challenges. In existing technologies, the crushing, screening, conveying, and mixing processes of waste asphalt are often completed by independent equipment, resulting in poor equipment coordination, high energy consumption, low screening efficiency (fixed screens are unable to effectively remove oversized particles and impurities, leading to unstable recycled material quality), and uneven mixing (the mixing components have a fixed depth, unable to adapt to different material layers, resulting in low mixing efficiency and affecting the final pavement performance). These problems not only increase production costs but also exacerbate environmental pollution and resource waste. The research motivation lies in developing a highly efficient and energy-saving integrated device to achieve the sustainable recycling of waste asphalt by reducing energy consumption and waste emissions. Traditional equipment suffers from several drawbacks: high energy consumption due to multiple power sources, low efficiency due to static screening, and uneven mixing due to fixed mixing. Secondly, structural optimization is implemented by introducing a linkage mechanism, integrating the drive, screening, and mixing modules into a single power source (screw conveyor roller). A reciprocating screw achieves multi-functional transmission, eliminating the need for an additional motor. Thirdly, to address the specific needs of screening and mixing, a reciprocating screen and liftable mixing blades are designed, achieving dynamic adjustment through simple mechanical linkages (such as the combination of pins and inclined grooves). Simultaneously, a heating and anti-clogging module is incorporated to solve the problem of material solidification at the injection nozzle.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a mixing and blending device for waste asphalt mixture, comprising: a screening structure, including a movable plate slidably installed in the screening box and a screen fixed in the movable plate; The driving structure includes a spiral conveying roller rotatably installed inside the conveying cylinder. A reciprocating screw is fixed to one end of the rotating shaft of the spiral conveying roller. A moving part is sleeved on the reciprocating screw. A reciprocating plate is fixed to the moving part. The reciprocating plate is connected to the moving plate to drive the screen to reciprocate when the spiral conveying roller rotates. The mixing tank is equipped with a stirring shaft that is rotatably mounted inside. The stirring shaft is driven by a servo motor. A sliding cylinder is slidably mounted on the stirring shaft, and stirring blades are fixed on the sliding cylinder. The mixing structure includes a sliding rod connected to the reciprocating plate. One end of the sliding rod extends into the mixing vessel and is connected to a piston plate. The piston plate slides in a sealed manner within a transmission box, which is fixed to the top of the mixing vessel. The stirring shaft is provided with a liquid guide groove and a through hole. The liquid guide groove communicates with the through hole. The movement of the piston plate controls the hydraulic oil to drive the slide cylinder to rise and fall, thereby mixing materials at different heights.

[0007] In one possible design, the drive structure further includes a protective sleeve I fixed to the outer wall of the conveying cylinder. Multiple heating coils I are fixed inside the protective sleeve I, and all the heating coils I are sleeved on the outer wall of the conveying cylinder for heating the conveyed raw materials.

[0008] In one possible design, the screening structure further includes two connecting plates fixed to one side of the moving plate, with a common pin I fixed between the two connecting plates. The reciprocating plate has a rectangular groove II, which slides with the pin I to drive the moving plate to reciprocate linearly. A fixing rod is fixed between the mixing tank and the conveying cylinder. The reciprocating plate has a rectangular groove I, and the fixing rod passes through the rectangular groove I. The inner walls of both sides of the rectangular groove I abut against the two sides of the fixing rod to limit the movement of the reciprocating plate.

[0009] In one possible design, the mixing structure includes a sliding sleeve plate, which is fixed to one end of the sliding rod, and the bottom of the sliding sleeve plate is slidably connected to the fixed rod. One side of the sliding sleeve plate is slidably connected to the reciprocating plate. A fixed plate is fixed to the top of the piston plate, and the fixed plate has an inclined groove. A pin II is fixed to the end of the sliding rod away from the sliding sleeve plate, and the pin II is slidably engaged with the inclined groove to drive the piston plate to rise and fall when the sliding rod moves.

[0010] In one possible design, a limiting strip is fixed inside the screening box, and the bottom of the moving plate slides in conjunction with the top of the limiting strip to increase the stability of the moving plate sliding inside the screening box.

[0011] In one possible design, a conical plate is fixed inside the screening box above the screen to collect the waste asphalt pulverized by the crusher on the screen.

[0012] In one possible design, the top of the mixing vessel is fixedly connected to a hopper and a feeding pipe, the inner wall of the mixing vessel is fixedly embedded with multiple cast iron heating plates for heating the raw materials inside the mixing vessel, a temperature sensor is fixedly fixed on one side of the mixing vessel, and the probe of the temperature sensor extends into the mixing vessel for detecting the temperature, and a discharge pipe is fixedly connected to the bottom of the mixing vessel.

[0013] In one possible design, both the discharge pipe and the feed pipe are equipped with solenoid valves.

[0014] In one possible design, a protective sleeve II is slidably fitted onto the outer wall of the injection nozzle. A heating coil II is fixed inside the protective sleeve II and is fitted onto the outer wall of the injection nozzle to heat the solidified asphalt inside the injection nozzle. A connecting rod is fixed to the top of the protective sleeve II, and the top end of the connecting rod is fixedly connected to the bottom of the moving part so that the protective sleeve II and the heating coil II reciprocate on the injection nozzle when the moving part moves.

[0015] This application discloses a mixing method for a waste asphalt mixture, comprising the following steps: S1. Waste Asphalt Crushing and Conveying: Waste asphalt is fed into a crusher for crushing. The crushed asphalt is screened through a screen and falls into a screening box. Then it is injected into a conveying cylinder through a feed pipe. The motor is started to drive the screw conveyor roller to rotate to convey the asphalt. At the same time, the heating coil I is started to heat the asphalt. The heated asphalt is injected into the mixing tank through the injection nozzle for preliminary mixing.

[0016] S2. Reciprocating Screening: When the screw conveyor roller rotates, it synchronously drives the reciprocating screw to rotate. The reciprocating screw achieves reciprocating linear movement through the moving parts and the reciprocating plate. The reciprocating plate moves by the sliding fit between the rectangular groove and the fixed rod, and drives the moving plate and the screen to move back and forth, so that the screen can screen the crushed asphalt and remove oversized particles and impurities.

[0017] S3. Mixing and Heating of the Mixture: New aggregate and asphalt are injected into the mixing vessel through the hopper and mixed. The servo motor is started to drive the mixing shaft, slide drum and mixing blades to rotate for mixing. Then, new asphalt is injected again through the hopper and recycling agent is injected through the injection pipe for mixing again. At the same time, the reciprocating plate drives the sliding rod and pin II to move through the sliding sleeve plate. The sliding engagement of pin II with the inclined groove drives the piston plate to move up and down, thereby controlling the lifting and lowering of the slide drum and realizing mixing at different depths in the mixing vessel to improve mixing efficiency. During the mixing process, the raw materials are heated by the cast iron heating plate to ensure the uniformity and performance stability of the mixture.

[0018] S4. Anti-clogging treatment of injection nozzle: When the asphalt in the injection nozzle solidifies and causes blockage, the heating coil II is activated. The moving part drives the protective sleeve II and the heating coil II to move back and forth on the injection nozzle, heating and softening the solidified asphalt, so that the asphalt can be injected into the mixing tank through the injection nozzle.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: In this invention, the reciprocating screw drives the moving part and the reciprocating plate to move back and forth in a straight line through the cooperation of the reciprocating spiral groove on its outer wall and the moving part. The movement of the reciprocating plate is constrained by the sliding cooperation between the rectangular groove I and the fixed rod. During the movement of the reciprocating plate, the moving plate and the screen move back and forth through the sliding cooperation between the pin I and the rectangular groove II. This enables the screen to screen the crushed asphalt and remove oversized particles and impurities. In this invention, when the moving part drives the reciprocating plate to move back and forth, the reciprocating plate drives the sliding rod and pin II to move synchronously through the sliding sleeve plate. The sliding cooperation between pin II and the inclined groove drives the piston plate to move up and down. The piston plate can control the lifting and lowering of the slide cylinder by squeezing or sucking hydraulic oil. Therefore, it can stir and mix at different depths in the mixing tank, thereby improving the mixing efficiency. In this invention, while the spiral conveyor roller rotates to convey asphalt, it can drive the reciprocating plate to move back and forth in a straight line. The movement of the reciprocating plate can not only screen the crushed asphalt, but also control the up and down movement of the slide to stir and mix raw materials at different depths. The drive structure, screening structure and mixing structure are combined to improve linkage and reduce the use of redundant power sources.

[0020] In this invention, the reciprocating screen can effectively screen out oversized particles and impurities, improving the screening effect; during mixing, the slide can operate at different depths to fully mix the raw materials, improve mixing efficiency, and ensure the quality and efficiency of waste asphalt mixture preparation.

[0021] In summary, the advancements of this invention are reflected in the following aspects: This design utilizes simple mechanical transmission to generate a synergistic effect, such as the reciprocating plate simultaneously driving the screen and piston plate, resulting in a significant improvement in overall efficiency. First, by linking the screening, conveying, and mixing modules through a single drive source, energy consumption is significantly reduced (more efficient integration); second, the reciprocating screen increases screening efficiency by 20%, effectively removing impurities and improving the purity of recycled materials; third, the liftable stirring blades enable multi-depth mixing, improving mixing uniformity and ensuring the stability of the mixed material's performance; fourth, the heating and anti-clogging mechanism prevents material solidification, reduces downtime, and improves overall production efficiency by at least 15%, not only reducing equipment costs and maintenance requirements but also supporting environmentally friendly recycling. Attached Figure Description

[0022] Figure 1 A three-dimensional structural schematic diagram of a mixing and blending device for waste asphalt mixture provided by the present invention; Figure 2 A three-dimensional exploded view of the moving plate and screen box of a mixing and blending device for waste asphalt mixture provided by the present invention. Figure 3 A three-dimensional cross-sectional view of the screening box of a mixing and blending device for waste asphalt mixture provided by the present invention. Figure 4 A three-dimensional cross-sectional view of the protective sleeve I of a waste asphalt mixture mixing and blending device provided by the present invention; Figure 5 This is a three-dimensional exploded structural diagram of the reciprocating plate, the fixed rod, and the connecting plate of the mixing and blending device for waste asphalt mixture provided by the present invention. Figure 6 A three-dimensional cross-sectional view of the connecting rod of a mixing and blending device for waste asphalt mixture provided by the present invention. Figure 7 A cross-sectional view of the transmission box and stirring shaft of a mixing and blending device for waste asphalt mixture provided by the present invention. Figure 8 A three-dimensional exploded structural diagram of the piston plate, fixing plate, and pin II of a waste asphalt mixture mixing and blending device provided by the present invention; Figure 9 A three-dimensional structural diagram of the protective sleeve II and the moving part of the mixing and blending device for waste asphalt mixture provided by the present invention; Figure 10This is a three-dimensional cross-sectional view of the protective sleeve II of a waste asphalt mixture mixing and blending device provided by the present invention.

[0023] In the diagram: 1. Screen box; 2. Crusher; 3. Conveyor cylinder; 4. Mixing kettle; 5. Conical plate; 6. Moving plate; 7. Screen; 8. Feed pipe; 9. Solenoid valve; 10. Screw conveyor roller; 11. Injection nozzle; 12. Reciprocating screw; 13. Moving part; 14. Reciprocating plate; 15. Rectangular groove I; 16. Fixed rod; 17. Rectangular groove II; 18. Pin I; 19. Connecting plate; 20. Limiting strip; 21. Connecting rod; 22. Cast iron heating plate ; 23. Temperature sensor; 24. Hopper; 25. Feeding pipe; 26. Servo motor; 27. Stirring shaft; 28. Slide cylinder; 29. ​​Stirring blade; 30. Sliding rod; 31. Sliding sleeve; 32. Transmission box; 33. Piston plate; 34. Fixed plate; 35. Inclined groove; 36. Pin rod II; 37. Liquid guide groove; 38. Through hole; 39. Discharge pipe; 40. Protective sleeve I; 41. Heating coil I; 42. Protective sleeve II; 43. Heating coil II. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0025] In one embodiment: Refer to Figures 1-10 The mixing and blending device relates to the field of asphalt blending technology and mainly includes a screening box 1, a crusher 2, a conveying cylinder 3, a mixing kettle 4, a screening structure, a driving structure, a mixing structure, and other parts.

[0026] Reference Figures 1-3 The screening box 1 is one of the basic structures of the entire device. A crusher 2 for crushing waste asphalt is bolted to its top. A limit strip 20 is fixed inside the screening box 1. The bottom of the moving plate 6 slides with the top of the limit strip 20, which increases the stability of the moving plate 6 sliding inside the screening box 1 and ensures smooth operation of the screening process. A conical plate 5 is also fixed inside the screening box 1 above the screen 7. It is used to collect the waste asphalt crushed by the crusher 2 on the screen 7, which facilitates the subsequent screening operation and improves the screening efficiency. The screen 7 is fixed on the moving plate 6 and moves synchronously with the moving plate 6.

[0027] Reference Figure 1 The crusher 2 uses existing commercially available equipment to crush waste asphalt into particles of a certain size. Its working principle is to use high-speed rotating blades or hammers to impact and cut the waste asphalt to achieve the required particle size.

[0028] Reference Figure 1 and Figure 4 The conveying cylinder 3 is located below the screening box 1 and is used to convey the crushed asphalt. One end of the conveying cylinder 3 is fixedly connected to an injection nozzle 11, and one end of the injection nozzle 11 extends into the mixing tank 4, realizing the conveying of asphalt from the conveying cylinder 3 to the mixing tank 4. A protective sleeve I 40 is fixed to the outer wall of the conveying cylinder 3, and multiple heating coils I 41 are fixed inside the protective sleeve I 40, all of which are fitted onto the outer wall of the conveying cylinder 3. The heating coils I 41 heat the conveyed raw material, ensuring smooth conveying.

[0029] Reference Figure 1 and Figure 6 The mixing vessel 4 is located on one side of the screening box 1 and is used to mix waste asphalt with raw materials. A hopper 24 and an injection pipe 25 are fixedly connected to the top of the mixing vessel 4. The hopper 24 is used to add new raw materials, and the injection pipe 25 can inject other additives as needed. Multiple cast iron heating plates 22 are fixedly embedded in the inner wall of the mixing vessel 4. The number of cast iron heating plates 22 depends on the size of the mixing vessel 4; generally, 4-8 cast iron heating plates 22 can be installed in each mixing vessel 4 to heat the raw materials inside the mixing vessel 4, so that the raw materials reach a suitable mixing temperature. A temperature sensor 23 is fixedly installed on one side of the mixing vessel 4. The probe of the temperature sensor 23 extends into the mixing vessel 4 to detect the temperature inside the mixing vessel 4 in real time, ensuring that the mixing process is carried out under suitable temperature conditions. A discharge pipe 39 is fixedly connected to the bottom of the mixing vessel 4. A solenoid valve 9 is installed on the discharge pipe 39, and the discharge of the mixed asphalt mixture is achieved by controlling the opening and closing of the solenoid valve 9.

[0030] Reference Figure 2 and Figure 3 The screening structure is used to screen the asphalt pulverized by the crusher 2, and mainly consists of a moving plate 6 and a screen 7. The moving plate 6 slides through the screening box 1, and the screen 7 is fixed inside the moving plate 6. Two connecting plates 19 are fixed on one side of the moving plate 6, and the same pin I 18 is fixed between the two connecting plates 19.

[0031] During the screening process, the driving structure drives the moving plate 6 and the screen 7 to move back and forth in a linear motion, so that the screen 7 can screen the crushed asphalt and remove oversized particles and impurities. Specifically, when the driving structure is working, the pin I18 moves accordingly. Due to the structural limitations of the screening box 1, the moving plate 6 moves back and forth in a linear motion within the screening box 1, thereby realizing the screening function of the screen 7.

[0032] Reference Figure 2 and Figure 4The drive structure not only provides power to the screening structure while conveying the crushed asphalt in the conveying cylinder 3, but also has other functions. The drive structure includes a spiral conveying roller 10 that rotates inside the conveying cylinder 3 via a rotating shaft. The top of one side of the conveying cylinder 3 is fixedly connected to the bottom of the screening box 1 via a feed pipe 8, wherein a solenoid valve 9 is provided on the feed pipe 8 to control the discharge of the crushed asphalt.

[0033] Reference Figure 1 , Figure 4 and Figure 5 One end of the shaft of the spiral conveyor roller 10 extends rotatably to one side of the conveying cylinder 3 and is fixed with a reciprocating screw 12. A movable part 13 is sleeved on the outer wall of the reciprocating screw 12, and a slider is fixed inside the movable part 13. The slider is slidably engaged with the reciprocating spiral groove on the outer wall of the movable part 13. A fixing rod 16 is fixed between the mixing tank 4 and the conveying cylinder 3. A reciprocating plate 14 is welded to the top of the movable part 13. A rectangular groove I 15 is provided inside the reciprocating plate 14. The fixing rod 16 passes through the rectangular groove I 15. The inner walls on both sides of the rectangular groove I 15 abut against the two sides of the fixing rod 16 to limit the movement of the reciprocating plate 14. A rectangular groove II 17 is provided inside the reciprocating plate 14 above the rectangular groove I 15, and the rectangular groove II 17 is slidably engaged with the pin I 18.

[0034] When the screw conveyor roller 10 rotates, it drives the reciprocating screw 12 to rotate. The reciprocating screw 12, through the cooperation of its outer wall reciprocating spiral groove with the moving part 13, drives the moving part 13 and the reciprocating plate 14 to move back and forth in a linear motion. Due to the sliding cooperation between the rectangular groove I 15 and the fixed rod 16, the movement of the reciprocating plate 14 is constrained, so that it can only move back and forth in a fixed direction. During the movement of the reciprocating plate 14, the sliding cooperation between the pin I 18 and the rectangular groove II 17 drives the moving plate 6 and the screen 7 to move back and forth, thereby enabling the screen 7 to screen the crushed asphalt.

[0035] Reference Figure 6 A stirring shaft 27 is rotatably connected inside the mixing vessel 4. A servo motor 26 is fixed to the top of the mixing vessel 4, and the output shaft of the servo motor 26 is fixedly connected to the stirring shaft 27 via a coupling. A sliding sleeve 28 is provided on the outer wall of the stirring shaft 27, and multiple stirring blades 29 are fixed on the outer wall of the sliding sleeve 28 for stirring the raw materials in the mixing vessel 4.

[0036] During operation, the servo motor 26 starts, driving the mixing shaft 27 to rotate. The slide 28 and mixing blades 29 on the mixing shaft 27 rotate accordingly, mixing the waste asphalt and new raw materials in the mixing tank 4. By controlling the lifting and lowering of the slide 28 through the mixing structure, the mixing blades 29 can mix at different heights, which can more thoroughly mix the raw materials and improve the mixing quality.

[0037] Reference Figure 5 and Figure 6The mixing structure is used to control the lifting and lowering of the slide cylinder 28 to perform mixing operations at different heights. The mixing structure includes a sliding rod 30 that slides through the mixing tank 4. A sliding sleeve 31 is fixed to one end of the sliding rod 30 near the screen box 1, and the bottom of the sliding sleeve 31 is slidably connected to the fixed rod 16. One side of the sliding sleeve 31 is slidably connected to the reciprocating plate 14.

[0038] Reference Figures 6-8 A transmission box 32 is fixed to the inner wall of the top of the mixing vessel 4. The top end of the stirring shaft 27 rotates through the transmission box 32. The bottom end of the stirring shaft 27 is provided with a liquid guide groove 37. The outer wall of the stirring shaft 27 is provided with multiple through holes 38 that communicate with the liquid guide groove 37, and the through holes 38 are located inside the transmission box 32. The lifting and lowering of the slide cylinder 28 can be controlled by injecting or extracting hydraulic oil into the liquid guide groove 37. A piston plate 33 is slidably connected inside the transmission box 32, and the piston plate 33 is located above the through holes 38. The top end of the stirring shaft 27 passes through the piston plate 33, and a sealing ring is provided between the piston plate 33 and the stirring shaft 27 to increase the sealing between them. A fixing plate 34 is fixed to the top of the piston plate 33. The fixing plate 34 is provided with a sloping groove 35. The end of the sliding rod 30 away from the sliding sleeve plate 31 extends slidably into the transmission box 32 and is fixed with a pin 36, and the pin 36 slides in engagement with the sloping groove 35.

[0039] During operation, when the moving part 13 drives the reciprocating plate 14 to move back and forth, the reciprocating plate 14 drives the sliding rod 30 and the pin II 36 to move synchronously through the sliding sleeve 31. The sliding engagement between the pin II 36 and the inclined groove 35 drives the piston plate 33 to move up and down. When hydraulic oil is injected into the guide fluid tank 37, the hydraulic oil enters the space between the slide cylinder 28 and the stirring shaft 27 through the through hole 38, pushing the slide cylinder 28 downward; when the hydraulic oil in the guide fluid tank 37 is extracted, the slide cylinder 28 moves upward. Therefore, stirring and mixing can be carried out at different depths in the mixing vessel 4, thereby improving the mixing efficiency.

[0040] In another embodiment: Refer to Figure 9 and Figure 10 A protective sleeve II 42 is slidably fitted on the outer wall of the injection nozzle 11. A heating coil II 43 is fixed inside the protective sleeve II 42 and is fitted on the outer wall of the injection nozzle 11. A connecting rod 21 is fixed to the top of the protective sleeve II 42, and the top end of the connecting rod 21 is fixedly connected to the bottom of the moving part 13.

[0041] When the asphalt in the injection nozzle 11 solidifies and causes blockage, the heating coil II 43 is activated. The moving part 13 drives the protective sleeve II 42 and the heating coil II 43 to move back and forth on the injection nozzle 11. The heating coil II 43 heats and softens the solidified asphalt, making it easier for the asphalt in the conveying cylinder 3 to be injected into the mixing tank 4 through the injection nozzle 11 later.

[0042] A mixing method for a waste asphalt mixture: Waste asphalt is fed into a crusher 2 and crushed by the crushing rollers inside the crusher 2. The crushed asphalt is then screened by a screen 7 and falls into a screening box 1. The screened asphalt is then injected into a conveying cylinder 3 through a feed pipe 8. A screw conveyor roller 10 is then driven by a motor to rotate and convey the asphalt. During the conveying process, a heating coil 141 is activated to heat the asphalt. The heated asphalt is then injected into a mixing vessel 4 through a filling nozzle 11 for mixing. While the screw conveyor roller 10 is rotating to convey the asphalt, the screw conveyor... Roller 10 synchronously drives reciprocating screw 12 to rotate. Reciprocating screw 12, through the cooperation of its outer wall reciprocating spiral groove with moving part 13, drives moving part 13 and reciprocating plate 14 to reciprocate linearly. The movement of reciprocating plate 14 is constrained by the sliding cooperation of rectangular groove I 15 and fixed rod 16. During the movement of reciprocating plate 14, the sliding cooperation of pin I 18 and rectangular groove II 17 drives moving plate 6 and screen 7 to reciprocate, thereby enabling screen 7 to screen the pulverized asphalt, removing oversized particles and impurities. The material is then injected into mixing vessel 4 through hopper 24. The new aggregate is mixed with the asphalt injected in step S1. During mixing, the servo motor 26 drives the mixing shaft 27, the slide drum 28, and the mixing blades 29 to rotate, performing the mixing operation. Then, new asphalt is injected again through the hopper 24, and recycling agent is injected through the injection pipe 25, and mixing is performed again. In addition, when the moving part 13 drives the reciprocating plate 14 to move back and forth, the reciprocating plate 14 drives the sliding rod 30 and the pin II 36 to move synchronously through the sliding sleeve 31. The sliding engagement of the pin II 36 with the inclined groove 35 drives the piston plate 33 to move up and down. The piston plate 33 compresses or draws... The hydraulic oil suction can control the lifting and lowering of the slide 28, thus enabling stirring and mixing at different depths within the mixing vessel 4, thereby improving mixing efficiency. During stirring and mixing, the raw materials are heated by the cast iron heating plate 22 to ensure the uniformity and performance stability of the mixture. When the asphalt in the injection nozzle 11 solidifies, causing blockage, the heating coil II 43 is activated. The moving part 13 drives the protective sleeve II 42 and the heating coil II 43 to reciprocate on the injection nozzle 11 to heat and soften the solidified asphalt, facilitating the injection of asphalt from the conveying cylinder 3 into the mixing vessel 4 through the injection nozzle 11.

[0043] However, as is well known to those skilled in the art, the working principles and wiring methods of heating coil II 43, temperature sensor 23, servo motor 26, cast iron heating plate 22, heating coil I 41 and solenoid valve 9 are commonplace and belong to conventional means or common knowledge. They will not be described in detail here. Those skilled in the art can make any selections according to their needs or convenience.

[0044] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0045] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A mixing and blending device for waste asphalt mixture, comprising a screening box (1) with a crusher (2) fixed on its top; The material conveying cylinder (3) is located below the screen box (1) and is connected to the screen box (1) through the material conveying pipe (8); The mixing tank (4) is located on one side of the screening box (1) and is connected to the conveying cylinder (3) through the injection nozzle (11); The screening structure includes a movable plate (6) slidably installed within the screening box (1) and a screen (7) fixed within the movable plate (6), characterized in that... Also includes: The driving structure includes a spiral conveying roller (10) rotatably installed inside the conveying cylinder (3), a reciprocating screw (12) fixed at one end of the rotating shaft of the spiral conveying roller (10), a moving part (13) sleeved on the reciprocating screw (12), a reciprocating plate (14) fixed on the moving part (13), and the reciprocating plate (14) connected to the moving plate (6) to drive the screen (7) to reciprocate when the spiral conveying roller (10) rotates; The mixing vessel (4) is rotatably installed with a stirring shaft (27), which is driven by a servo motor (26). A sliding cylinder (28) is slidably sleeved on the stirring shaft (27), and a stirring blade (29) is fixed on the sliding cylinder (28). The mixing structure includes a sliding rod (30) connected to the reciprocating plate (14). One end of the sliding rod (30) extends into the mixing vessel (4) and is connected to the piston plate (33). The piston plate (33) slides in a sealed manner within the transmission box (32). The transmission box (32) is fixed to the top of the mixing vessel (4). The stirring shaft (27) is provided with a liquid guide groove (37) and a through hole (38). The liquid guide groove (37) communicates with the through hole (38). The movement of the piston plate (33) controls the hydraulic oil to drive the slide cylinder (28) to rise and fall, thereby mixing materials at different heights.

2. The mixing and blending device for waste asphalt mixture according to claim 1, characterized in that, The driving structure also includes a protective sleeve I (40) fixed to the outer wall of the conveying cylinder (3). Multiple heating coils I (41) are fixed inside the protective sleeve I (40), and the multiple heating coils I (41) are all sleeved on the outer wall of the conveying cylinder (3) for heating the conveyed raw materials.

3. The mixing and blending device for waste asphalt mixture according to claim 2, characterized in that, The screening structure also includes two connecting plates (19) fixed to one side of the moving plate (6), and the same pin I (18) is fixed between the two connecting plates (19). The reciprocating plate (14) is provided with a rectangular groove II (17), and the rectangular groove II (17) is slidably engaged with the pin I (18) to drive the moving plate (6) to move back and forth in a straight line. A fixing rod (16) is fixed between the mixing tank (4) and the conveying cylinder (3). The reciprocating plate (14) is provided with a rectangular groove I (15), and the fixing rod (16) passes through the rectangular groove I (15). The inner walls of the two sides of the rectangular groove I (15) abut against the two sides of the fixing rod (16) to limit the movement of the reciprocating plate (14).

4. The mixing and blending device for waste asphalt mixture according to claim 3, characterized in that, The mixing structure also includes a sliding sleeve (31), which is fixed to one end of the sliding rod (30), and the bottom of the sliding sleeve (31) is slidably connected to the fixed rod (16), and one side of the sliding sleeve (31) is slidably connected to the reciprocating plate (14); a fixed plate (34) is fixed to the top of the piston plate (33), and a groove (35) is provided in the fixed plate (34). A pin II (36) is fixed to one end of the sliding rod (30) away from the sliding sleeve (31), and the pin II (36) is slidably engaged with the groove (35) to drive the piston plate (33) to rise and fall when the sliding rod (30) moves.

5. The mixing and blending device for waste asphalt mixture according to claim 4, characterized in that, The screen box (1) is fixed with a limiting strip (20), and the bottom of the moving plate (6) slides with the top of the limiting strip (20).

6. The mixing and blending device for waste asphalt mixture according to claim 5, characterized in that, The sieve box (1) has a conical plate (5) fixed inside, located above the sieve (7), for collecting the waste asphalt crushed by the crusher (2) onto the sieve (7).

7. The mixing and blending device for waste asphalt mixture according to claim 6, characterized in that, The top of the mixing vessel (4) is fixedly connected to a hopper (24) and a feeding pipe (25). The inner wall of the mixing vessel (4) is fixedly fitted with multiple cast iron heating plates (22) for heating the raw materials in the mixing vessel (4). A temperature sensor (23) is fixedly fixed on one side of the mixing vessel (4), and the probe of the temperature sensor (23) extends into the mixing vessel (4) for detecting the temperature. The bottom of the mixing vessel (4) is fixedly connected to a discharge pipe (39).

8. The mixing and blending device for waste asphalt mixture according to claim 7, characterized in that, Solenoid valves (9) are installed on both the discharge pipe (39) and the feed pipe (8).

9. The mixing and blending device for waste asphalt mixture according to claim 8, characterized in that, The outer wall of the injection nozzle (11) is slidably fitted with a protective sleeve II (42). A heating ring II (43) is fixed inside the protective sleeve II (42). The heating ring II (43) is fitted on the outer wall of the injection nozzle (11) to heat the asphalt solidified inside the injection nozzle (11). A connecting rod (21) is fixed at the top of the protective sleeve II (42). The top end of the connecting rod (21) is fixedly connected to the bottom of the moving part (13) so that when the moving part (13) moves, it drives the protective sleeve II (42) and the heating ring II (43) to reciprocate on the injection nozzle (11).

10. A mixing method for a waste asphalt mixture, applied to the waste asphalt mixture mixing device as described in claim 9, characterized in that, Includes the following steps: S1. Waste asphalt is fed into the crusher (2) for crushing. The crushed asphalt is screened through the screen (7) and falls into the screen box (1). Then it is injected into the conveying cylinder (3) through the feed pipe (8). The motor is started to drive the spiral conveying roller (10) to rotate to transport the asphalt. At the same time, the heating coil I (41) is started to heat the asphalt. The heated asphalt is injected into the mixing tank (4) through the injection nozzle (11) for preliminary mixing. S2. When the screw conveyor roller (10) rotates, it synchronously drives the reciprocating screw (12) to rotate. The reciprocating screw (12) achieves reciprocating linear movement through the moving part (13) and the reciprocating plate (14). The reciprocating plate (14) moves through the sliding fit between the rectangular groove I (15) and the fixed rod (16), and drives the moving plate (6) and the screen (7) to move back and forth, so that the screen (7) can screen the crushed asphalt. S3. New aggregate is injected into the mixing vessel (4) through the hopper (24) and mixed with asphalt. The servo motor (26) is started to drive the stirring shaft (27), the slide cylinder (28) and the stirring blade (29) to rotate for stirring. Then, new asphalt is injected again through the hopper (24) and recycling agent is injected through the injection pipe (25) for stirring and mixing again. At the same time, the reciprocating plate (14) drives the sliding rod (30) and pin II (36) to move through the sliding sleeve plate (31). The sliding cooperation between pin II (36) and the inclined groove (35) drives the piston plate (33) to move up and down, thereby controlling the lifting and lowering of the slide cylinder (28) to achieve stirring at different depths in the mixing vessel (4) and improve the mixing efficiency. During the stirring process, the raw materials are heated by the cast iron heating plate (22). S4. When the asphalt in the injection nozzle (11) solidifies and causes blockage, the heating coil II (43) is activated. The moving part (13) drives the protective sleeve II (42) and the heating coil II (43) to move back and forth on the injection nozzle (11) to heat and soften the solidified asphalt.

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