Old asphalt mixture recycling device

Abstract

This invention discloses a used asphalt mixture recycling device, relating to the field of asphalt recycling technology. It includes: a fixed frame; a crushing chamber mounted on top of the fixed frame; a crushing roller mounted inside the crushing chamber; a feeding channel mounted on top of the crushing chamber; a vibrating screen housing mounted at the bottom of the crushing chamber; a positive pressure pneumatic conveying device mounted at the outlet of the vibrating screen housing; a recycling furnace located on one side of the fixed frame; and a conveying pipe installed between the output end of the positive pressure pneumatic conveying device and the inlet of the recycling furnace. By incorporating a temperature control component, this invention ensures that the asphalt, after preheating, enters the recycling furnace at a pre-existing temperature, thus reducing thermal shock. The time required for melting the asphalt after heating from 60 degrees Celsius into the recycling furnace is significantly reduced compared to room temperature, thereby greatly improving the overall processing efficiency of the equipment.

Description

Technical Field

[0001] This invention relates to the field of asphalt recycling technology, specifically to a device for recycling and regenerating old asphalt mixtures. Background Technology

[0002] Due to its comfortable driving experience and ease of maintenance, asphalt pavement is the primary material used on most high-grade highways in my country. Highway construction has now entered a period of large-scale maintenance and repair. Therefore, most highways built in the early stages have reached the end of their service life. Furthermore, due to the rapid increase in traffic volume, asphalt pavements have developed ruts, cracks, and other defects before reaching their full lifespan. Current maintenance methods for asphalt pavements mainly focus on excavating and milling the existing pavement and then laying new asphalt mixture. This results in a significant amount of asphalt mixture being discarded, causing serious environmental pollution and wasting resources. Therefore, the effective and efficient utilization of waste asphalt mixture, turning it into a valuable resource for road surface service, requires the use of asphalt mixture recycling and regeneration equipment to recycle and reuse old asphalt.

[0003] In existing asphalt mixture recycling and regeneration equipment, the old asphalt mixture obtained from milling or excavation undergoes crushing and screening operations to remove impurities and oversized particles. The waste asphalt mixture separated during screening is directly fed into a recycling furnace for heating. Since the initial temperature of the asphalt is at room temperature, the furnace needs to heat it intensively within a short time, rapidly raising its temperature to a high working state. This rapid heating process from room temperature to high temperature not only significantly increases energy consumption and prolongs the overall heating time, reducing the recycling efficiency of the waste asphalt mixture, but also may adversely affect the chemical structure and physical properties of the asphalt due to the drastic temperature change, leading to secondary aging of the old asphalt and consequently affecting the quality stability and final road performance of the recycled mixture, making it difficult to meet the high-quality requirements of road paving. Therefore, we provide an old asphalt mixture recycling and regeneration device to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to address the problem that existing waste asphalt mixture recycling and regeneration devices require high-intensity, short-duration heating of the recycling furnace to rapidly raise it to working temperature due to its low initial temperature. This not only significantly increases the energy consumption required for heating but also greatly prolongs the heating time, thereby greatly reducing the overall processing efficiency of the equipment. The invention provides a waste asphalt mixture recycling and regeneration device.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a used asphalt mixture recycling device, comprising: a fixed frame, a crushing chamber mounted on the top of the fixed frame, a crushing roller mounted on the inner side of the crushing chamber, a feeding channel mounted on the top of the crushing chamber, a vibrating screen housing mounted on the bottom of the crushing chamber, a positive pressure pneumatic conveying device mounted at the outlet of the vibrating screen housing, a recycling furnace disposed on one side of the fixed frame, and a conveying pipe installed between the output end of the positive pressure pneumatic conveying device and the inlet of the recycling furnace; the vibrating... The inner side of the screening machine housing is respectively equipped with a temperature control component, a reciprocating shearing unit, and an auxiliary crushing mechanism. The temperature control component includes: hot air blowers installed on the outer wall of the crushing chamber and the vibrating screening machine housing, respectively. The air outlet of the hot air blower is connected to the air inlet of the crushing chamber and the vibrating screening machine housing, respectively. The first hot air blower introduces 30-degree hot air into the crushing chamber to preheat the recycled old asphalt mixture, and the second hot air blower introduces 60-degree hot air into the vibrating screening machine housing to preheat the recycled old asphalt mixture again.

[0006] As a further embodiment of the present invention: a first motor is fixedly connected to one side of the housing of the vibrating screen, and the actuator end of the first motor extends through the interior of the housing of the vibrating screen and is fixedly connected to a rotating roller, and multiple material carrier plates are fixedly connected to the outer wall of the rotating roller.

[0007] As a further embodiment of the present invention: the reciprocating shearing unit includes a third screen plate fixedly connected to the inner side of the housing of the vibrating screener. A plurality of top discharge sleeves are fixedly connected to the inner side of the discharge port of the third screen plate. A second screen plate is arranged below the third screen plate. A plurality of bottom discharge sleeves are fixedly connected to the top of the second screen plate, and the number of bottom discharge sleeves matches the number of top discharge sleeves. The outer diameter of the bottom discharge sleeve matches the inner diameter of the top discharge sleeve, and the top discharge sleeve is sleeved on the outer wall of the bottom discharge sleeve. A first screen plate is arranged at the bottom of the second screen plate, and the aperture of the first screen plate matches the aperture of the top discharge sleeve.

[0008] As a further embodiment of the present invention: the reciprocating shearing unit further includes movable frames respectively disposed on both sides of the vibrating screen housing. A second fixed seat is fixedly connected to the bottom inner side of the movable frame, and a large bevel gear is rotatably connected to the top of the second fixed seat. A second shaft is rotatably connected to the inner side of the movable frame. A small bevel gear meshing with the large bevel gear is fixedly connected to one end of the second shaft. A protective plate is fixedly connected to one side of the movable frame, and one of the protective plates is fixedly connected to each side of the second screen plate. A rotating circular plate is fixedly connected to the other end of the second shaft through the outside of the protective plate. A sleeve shaft is fixedly connected to one side of the rotating circular plate, and a sleeve rod is provided on one side of the rotating circular plate. The sleeve rod is sleeved on the outer wall of the sleeve shaft. A connecting shaft is fixedly connected to one side of the sleeve shaft, and a fixing block is fixedly connected to one end of the connecting shaft. The top of the fixing block is fixedly connected to the bottom of the first screen plate. A drive assembly for driving the large bevel gear to rotate is provided inside the movable frame.

[0009] As a further embodiment of the present invention: the protective plate is slidably connected to the housing of the vibrating screen through an auxiliary sliding groove, and a second trapezoidal slide rail is fixedly connected to one side of the protective plate. A trapezoidal sliding groove matching the second trapezoidal slide rail is opened on the inner side of the first screen plate, and the first screen plate is slidably connected to the outer side of the second trapezoidal slide rail through the trapezoidal sliding groove opened on the inner side.

[0010] As a further embodiment of the present invention: the driving assembly includes two sets of first fixed seats respectively fixedly connected to both sides of the housing of the vibrating screen. Each set of first fixed seats has two units. A second motor is fixedly connected to one side of the first fixed seat located on the same side. The execution end of the second motor passes through the outside of the first fixed seat and is fixedly connected to a second reciprocating screw. One end of the second reciprocating screw is fixedly connected to a first reciprocating screw through a columnar connecting rod, and one end of the first reciprocating screw is rotatably connected to the first fixed seat. A limiting slide rod is rotatably connected to the inner side of the other first fixed seat. The outer walls of the first reciprocating screw and the second reciprocating screw are threadedly connected to the moving frame. A second sliding groove matching the limiting slide rod is opened on the inner side of the moving frame. The moving frame is slidably connected to the limiting slide rod through the second sliding groove.

[0011] As a further embodiment of the present invention: two first trapezoidal slide rails are fixedly connected to the outer wall of the cylindrical connecting rod, and a first slide groove matching the first trapezoidal slide rail is opened inside the large bevel gear, and the large bevel gear is slidably connected to the outer wall of the first trapezoidal slide rail through the first slide groove.

[0012] As a further embodiment of the present invention: the auxiliary crushing mechanism includes a plurality of third fixed seats fixedly connected to the inner side of each of the bottom feeding sleeves. A shearing plate is rotatably connected to the inner side of each of the third fixed seats via a first shaft. A protective frame is fixedly connected to one side of each of the third fixed seats. A first spur gear is fixedly connected to one end of the first shaft through to the outside of the third fixed seat. A through groove matching the first spur gear is opened inside the bottom feeding sleeve. A spur rack is meshed on one side of each of the first spur gears. The plurality of spur racks are fixedly connected to each other via a connecting ring. A third sliding groove matching the connecting ring is opened inside the bottom feeding sleeve. The connecting ring is slidably connected to the bottom feeding sleeve via the third sliding groove.

[0013] As a further embodiment of the present invention: the auxiliary crushing mechanism further includes an arc-shaped guide rod rotatably connected inside the bottom feeding sleeve. One end of the arc-shaped guide rod is fixedly connected to an arc-shaped rack. A limiting plate is fixedly connected to the bottom of the arc-shaped rack and the bottom of the arc-shaped guide rod. A pushing rod is provided between the two limiting plates. One end of the pushing rod is fixedly connected to the top of the first screen plate. A second spur gear meshes with one side of the arc-shaped rack. A one-way screw is fixedly connected to the top of the second spur gear. One end of the one-way screw passes through to the outside of one of the spur racks and is threadedly connected to the spur rack. The one-way screw is rotatably connected to the bottom feeding sleeve. A fourth sliding groove matching the spur rack is opened on the inner side of the bottom feeding sleeve. The spur rack is slidably connected to the bottom feeding sleeve through the fourth sliding groove.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. By setting up a temperature control component, before the asphalt enters the crushing chamber, two hot air blowers respectively introduce hot air into the crushing chamber and the vibrating screen housing through connecting pipes, so that the temperature inside the crushing chamber is maintained at 30 degrees Celsius and the temperature inside the screening frame is maintained at 60 degrees Celsius. The temperature of 30 degrees Celsius in the crushing chamber can make the aggregate relatively softer, while the temperature of 60 degrees Celsius inside the screening frame can further soften the asphalt, reduce the viscosity, reduce the agglomeration caused by asphalt adhesion between particles, and make the particle size distribution of each grade of particles more uniform. After being preheated at 30 degrees Celsius and 60 degrees Celsius, the asphalt already has a certain temperature base when it enters the recycling furnace, thereby reducing thermal shock. The time required for heating and melting in the recycling furnace after heating from 60 degrees Celsius is greatly reduced compared to room temperature, thereby greatly improving the overall processing efficiency of the equipment.

[0016] 2. By setting up the first screen plate and other components, the staggered movement of the first screen plate trough and the bottom feeding sleeve creates a shearing force similar to scissors, which shears the screened asphalt fragments. When the asphalt fragments pass through the trough, the horizontally reciprocating first screen plate applies shear stress to the asphalt fragments that exceed the set particle size, causing them to break further. Traditional screening only filters particles by the size of the screen holes, while the shearing action can forcibly break up the asphalt fragments that are stuck together or have exceeded the particle size limit, making the final asphalt fragments more uniform and meeting the particle size requirements of recycled asphalt. This greatly improves the processing efficiency of the screening process, and thus improves the overall processing efficiency of the equipment.

[0017] 3. By setting up components such as the bottom feeding sleeve, the reciprocating movement of the bottom feeding sleeve inside the top feeding sleeve is equivalent to a piston scraping action, which can remove the viscous asphalt clumps adhering to the inner wall of the sleeve, and prevent old asphalt from solidifying on the inner wall of the sleeve due to the drop in temperature, thus avoiding poor material discharge. In addition, the squeezing force generated on the material during the extension and contraction of the sleeve can break up the particle clusters formed by the adhesion of aged gum, improve the flowability of the material, thereby greatly improving the screening effect of asphalt and improving the overall processing efficiency of the equipment.

[0018] 4. By setting up an auxiliary mechanism, the shearing plate is made of metal and can act like a blade. When the first screen plate moves laterally back and forth at the bottom of the bottom feeding sleeve, the first screen plate drives multiple push rods to push the limiting plate at the bottom of an arc-shaped rack to move laterally back and forth. This drives the arc-shaped rack to drive the second spur gear to rotate back and forth, which in turn drives the one-way screw to drive the spur rack to rotate up and down. At this time, the spur rack drives the first spur gear to rotate back and forth, and drives multiple shearing plates inside the bottom feeding sleeve to swing back and forth. This allows the ends of the shearing plates to shear the asphalt. This allows large pieces of asphalt mixture that have not passed through the screen holes during the screening process to be sheared by the shearing plates, thereby preventing clumping inside the feeding sleeve and causing blockages, thus ensuring the stability of subsequent feeding. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention;

[0020] Figure 2 This is an overall side sectional view of the present invention;

[0021] Figure 3 This is a schematic diagram of the internal structure of the vibrating screen housing of the present invention;

[0022] Figure 4 This is a schematic diagram of the structure between the vibrating screen housing and the vibrating screen housing of the present invention;

[0023] Figure 5 This is a schematic diagram of the structure between the third sieve plate and the first sieve plate of the present invention;

[0024] Figure 6 This is a schematic diagram of the structure between the third screen plate and the top feeding sleeve of the present invention;

[0025] Figure 7 This is a schematic diagram of the internal structure of the bottom feeding sleeve of the present invention;

[0026] Figure 8 This is a schematic diagram of the structure between the bottom feeding sleeve and the arc-shaped rack of the present invention.

[0027] In the diagram: 1. Fixed frame; 2. Crushing chamber; 3. Feeding channel; 4. Hot air blower; 5. Vibrating screen housing; 6. First shaft; 7. Moving frame; 8. Positive pressure pneumatic conveying device; 9. Conveying pipeline; 10. Recycling furnace; 11. First motor; 12. Rotary roller; 13. Carrying plate; 14. First fixed seat; 15. First reciprocating screw; 16. Columnar connecting rod; 17. Second reciprocating screw; 18. Limiting slide bar; 19. Second fixed seat; 20. Large bevel gear; 21. First trapezoidal slide rail; 22. First screen plate; 23. Bottom discharge sleeve; 24. Second screen plate; 25. Top discharge sleeve; 6. Third screen plate; 27. Rotating circular plate; 28. Sleeve rod; 29. ​​Second shaft rod; 30. Second motor; 31. Small bevel gear; 32. Second trapezoidal slide rail; 33. Trapezoidal slide groove; 34. Sleeve shaft; 35. Connecting shaft rod; 36. Fixing block; 37. Protective plate; 38. Auxiliary slide groove; 39. Protective frame; 40. Shearing plate; 41. Straight rack; 42. Connecting ring; 43. First spur gear; 44. One-way lead screw; 45. Arc rack; 46. Second spur gear; 47. Crushing roller; 48. Arc guide rod; 49. Limiting plate; 50. Push rod; 51. Connecting pipe; 52. Third fixed seat. Detailed Implementation

[0028] 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.

[0029] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The following describes embodiments of the invention based on its overall structure.

[0030] Please see Figures 1 to 8 This embodiment provides a used asphalt mixture recycling device, including: a fixed frame 1, a crushing chamber 2 installed on the top of the fixed frame 1, a crushing roller 47 installed on the inner side of the crushing chamber 2, a feeding channel 3 installed on the top of the crushing chamber 2, a vibrating screen housing 5 installed at the bottom of the crushing chamber 2, a positive pressure pneumatic conveying device 8 installed at the outlet of the vibrating screen housing 5, a recycling furnace 10 arranged on one side of the fixed frame 1, and a conveying pipe 9 installed between the output end of the positive pressure pneumatic conveying device 8 and the inlet of the recycling furnace 10. The inner side is respectively equipped with a temperature control component, a reciprocating shearing unit and an auxiliary crushing mechanism. The temperature control component includes: a hot air blower 4 installed on the outer wall of the crushing chamber 2 and the vibrating screen housing 5 respectively. The air outlet of the hot air blower 4 is connected to the air inlet of the crushing chamber 2 and the vibrating screen housing 5 respectively. The first hot air blower 4 introduces 30-degree hot air into the crushing chamber 2 to preheat the recycled old asphalt mixture. The second hot air blower 4 introduces 60-degree hot air into the vibrating screen housing 5 to preheat the recycled old asphalt mixture again.

[0031] Before the asphalt enters the crushing chamber 2, two hot air blowers 4 respectively introduce hot air into the crushing chamber 2 and the vibrating screen housing 5 through connecting pipes 51, so that the temperature inside the crushing chamber 2 is maintained at 30 degrees Celsius and the temperature inside the screening frame is maintained at 60 degrees Celsius. The temperature of 30 degrees Celsius in the crushing chamber 3 can make the aggregate relatively softer, while the temperature of 60 degrees Celsius inside the screening frame can further soften the asphalt, reduce the viscosity, reduce the agglomeration caused by asphalt adhesion between particles, and make the particle size distribution of each grade of particles more uniform. After being preheated at 30 and 60 degrees Celsius, the asphalt has a certain temperature base when it enters the recycling furnace, thereby reducing thermal shock. The time required for heating and melting in the recycling furnace 10 after heating from 60 degrees Celsius is greatly reduced compared to room temperature, thereby greatly improving the overall processing efficiency of the equipment.

[0032] Please see Figures 1 to 8A first motor 11 is fixedly connected to one side of the vibrating screen housing 5. The actuator end of the first motor 11 extends through the interior of the vibrating screen housing 5 and is fixedly connected to a rotating roller 12. Multiple material carrier plates 13 are fixedly connected to the outer wall of the rotating roller 12. The reciprocating shearing unit includes a third screen plate 26 fixedly connected to the inner side of the vibrating screen housing 5. Multiple top discharge sleeves 25 are fixedly connected to the inner side of the discharge port of the third screen plate 26. A second screen plate 24 is arranged below the third screen plate 26. Multiple bottom discharge sleeves 23 are fixedly connected to the top of the second screen plate 24, and the number of bottom discharge sleeves 23 matches the number of top discharge sleeves 25. The outer diameter of the bottom discharge sleeves 23 matches the inner diameter of the top discharge sleeves 25, and the top discharge sleeves 25 are sleeved on the bottom discharge sleeves 25. The outer wall of the material sleeve 23, the bottom of the second screen plate 24 is provided with a first screen plate 22, the screening aperture of the first screen plate 22 matches the aperture of the top material sleeve 25. The reciprocating shearing unit also includes movable frames 7 respectively arranged on both sides of the vibrating screen housing 5. The bottom inner side of the movable frame 7 is fixedly connected to a second fixed seat 19, the top of the second fixed seat 19 is rotatably connected to a large bevel gear 20, the inner side of the movable frame 7 is rotatably connected to a second shaft 29, one end of the second shaft 29 is fixedly connected to a small bevel gear 31 that meshes with the large bevel gear 20, one side of the movable frame 7 is fixedly connected to a protective plate 37, and both sides of the second screen plate 24 are respectively fixedly connected to a protective plate 37. The other end of the second shaft 29 passes through to the outside of the protective plate 37 and is fixed. A rotating circular plate 27 is connected to the screen. A sleeve shaft 34 is fixedly connected to one side of the rotating circular plate 27. A sleeve rod 28 is provided on one side of the rotating circular plate 27 and is sleeved on the outer wall of the sleeve shaft 34. A connecting shaft 35 is fixedly connected to one side of the sleeve shaft 34. A fixing block 36 is fixedly connected to one end of the connecting shaft 35. The top of the fixing block 36 is fixedly connected to the bottom of the first screen plate 22. A drive assembly for driving the large bevel gear 20 to rotate is provided inside the moving frame 7. A protective plate 37 is slidably connected to the vibrating screen housing 5 through an auxiliary slide groove 38. A second trapezoidal slide rail 32 is fixedly connected to one side of the protective plate 37. A trapezoidal slide groove 33 matching the second trapezoidal slide rail 32 is opened on the inner side of the first screen plate 22. The first screen plate 22 passes through the trapezoidal slide groove 33 opened on the inner side. 3. A sliding connection is made to the outside of the second trapezoidal slide rail 32. The drive assembly includes two sets of first fixed seats 14 respectively fixedly connected to both sides of the vibrating screen housing 5. Each set of first fixed seats 14 has two units. A second motor 30 is fixedly connected to one side of the first fixed seats 14 located on the same side. The execution end of the second motor 30 extends through to the outside of the first fixed seat 14 and is fixedly connected to a second reciprocating screw 17. One end of the second reciprocating screw 17 is fixedly connected to a first reciprocating screw 15 through a columnar connecting rod 16, and one end of the first reciprocating screw 15 is rotatably connected to the first fixed seat 14. A limit slide rod 18 is rotatably connected to the inner side of the other first fixed seat 14. The outer walls of the first reciprocating screw 15 and the second reciprocating screw 17 are threadedly connected to the moving frame 7.Furthermore, the inner side of the movable frame 7 is provided with a second sliding groove that matches the limiting slide rod 18. The movable frame 7 is slidably connected to the limiting slide rod 18 through the second sliding groove. Two first trapezoidal slide rails 21 are fixedly connected to the outer wall of the cylindrical connecting rod 16, and the interior of the large bevel gear 20 is provided with a first sliding groove that matches the first trapezoidal slide rail 21. The large bevel gear 20 is slidably connected to the outer wall of the first trapezoidal slide rail 21 through the first sliding groove.

[0033] The crushing operation performed by the crushing roller 47 is existing technology. Since this solution does not involve improvements to components such as the crushing roller 47, it is not described in detail here. A vibrating motor for causing the third screen plate 26 to vibrate is installed on one side of the vibrating screen housing 5. Since how the vibrating screen housing 5 vibrates is existing technology, it is not described in detail here.

[0034] The first screen plate 22 is woven from steel wire mesh or made of iron material, allowing the mesh openings on the inner side of the first screen plate 22 to perform shearing operations. When the equipment is needed, the power is turned on first, and then the old asphalt is fed into the crushing chamber 2 from the feed channel 3 through the conveying equipment. Then, the old asphalt is crushed by the crushing roller 47. The crushed asphalt will fall between the two carrying plates 13. Then, the first motor 11 is intermittently started to drive the rotating roller 12 to rotate, and at the same time, it drives the carrying plate 13 to rotate, so that the crushed asphalt between the carrying plates 13 falls to the top of the third screen plate 26. At this time, the vibrating screen housing 5 drives the third screen plate 26, the second screen plate 24 and the first screen plate 22 to vibrate, so that the asphalt at the top of the third screen plate 26 can be screened and then fall to the bottom of the bottom discharge sleeve 23. At this time, the two second motors 30 drive the two cylindrical connecting rods 16 to rotate through the second reciprocating screw 17, and at the same time, the cylindrical connecting rods 16 drive the large bevel gear 20 through the first trapezoidal slide rail 21 to the second fixed The top of seat 19 rotates, thereby driving the small bevel gear 31 to rotate, and driving the rotating circular plate 27 to rotate through the second shaft 29. The rotating circular plate 27 drives the sleeve shaft 34 to rotate inside the sleeve rod 28, and pushes the fixed block 36 to move laterally back and forth through the connecting shaft 35. In turn, the two fixed blocks 36 drive the first screen plate 22 to move laterally back and forth on the second trapezoidal slide rail 32, so that the first screen plate 22 can move back and forth alternately with the bottom feeding sleeve 23 through its own trough, and shear the asphalt entering the bottom of the bottom feeding sleeve 23. The alternating movement of the trough of the first screen plate 22 and the bottom feeding sleeve 23 forms a shearing force similar to scissors, which shears the screened asphalt fragments. Traditional screening only screens particles by the size of the screen hole, while the shearing action can forcibly break up the particles that are stuck together or have exceeded the size limit, so that the final output asphalt fragments are more uniform and meet the particle size requirements of recycled asphalt, thereby greatly improving the processing efficiency of the screening process, and thus improving the overall processing efficiency of the equipment.

[0035] When the second motor 30 starts, it drives the second reciprocating lead screw 17 and, through the columnar connecting rod 16, simultaneously drives the first reciprocating lead screw 15 to rotate. This drives the moving frame 7 to move the second fixed seat 19 and the large bevel gear 20 back and forth on the outer wall of the first trapezoidal slide rail 21. Mechanical limiting ensures that the large bevel gear 20 and the small bevel gear 31 are always meshed. Simultaneously, as the moving frame 7 moves upward, the protective plate 37 drives the second trapezoidal slide rail 32 upward, causing the first screen plate 22 and the second screen plate 24 to move up and down reciprocally. At this time, the second screen plate 24 drives multiple bottom feeding sleeves 23 to reciprocate inside the top feeding sleeve 25. This reciprocating movement of the bottom feeding sleeves 23 inside the top feeding sleeve 25 is equivalent to a piston-like scraping action, which can remove the viscous asphalt clumps adhering to the inner wall of the sleeve. This prevents old asphalt from solidifying on the inner wall of the sleeve due to temperature drop, thus avoiding poor material discharge. Furthermore, the squeezing force generated on the material during the sleeve's extension and retraction can break up the particle clusters formed by the adhesion of aged gum, improving the material's fluidity. This greatly improves the screening effect of asphalt and enhances the overall processing efficiency of the equipment.

[0036] Please see Figures 5-8 The auxiliary crushing mechanism includes multiple third fixed seats 52, each fixedly connected to the inner side of each bottom feeding sleeve 23. A shearing plate 40 is rotatably connected to the inner side of each third fixed seat 52 via a first shaft 6. A protective frame 39 is fixedly connected to one side of each third fixed seat 52. One end of the first shaft 6 extends through to the outside of the third fixed seat 52 and is fixedly connected to a first spur gear 43. Each bottom feeding sleeve 23 has a through groove matching the first spur gear 43 inside, and a spur rack 41 meshes with one side of each first spur gear 43. Multiple spur racks 41 are fixedly connected by a connecting ring 42. A third sliding groove matching the connecting ring 42 is opened on the inner side of the bottom feeding sleeve 23, and the connecting ring 42 is slidably connected to the bottom feeding sleeve 23 through the third sliding groove. The auxiliary crushing mechanism also includes... An arc-shaped guide rod 48 is rotatably connected inside the bottom feeding sleeve 23. One end of the arc-shaped guide rod 48 is fixedly connected to an arc-shaped rack 45. A limiting plate 49 is fixedly connected to the bottom of the arc-shaped rack 45 and the bottom of the arc-shaped guide rod 48. A push rod 50 is provided between the two limiting plates 49. One end of the push rod 50 is fixedly connected to the top of the first screen plate 22. A second spur gear 46 meshes with one side of the arc-shaped rack 45. A one-way screw 44 is fixedly connected to the top of the second spur gear 46. One end of the one-way screw 44 passes through the outside of one of the spur racks 41 and is threadedly connected to the spur rack 41. The one-way screw 44 is rotatably connected to the bottom feeding sleeve 23. A fourth sliding groove matching the spur rack 41 is opened on the inner side of the bottom feeding sleeve 23. The spur rack 41 is slidably connected to the bottom feeding sleeve 23 through the fourth sliding groove.

[0037] The shearing plate 40 is made of metal and can act like a blade. When the first screen plate 22 moves laterally back and forth at the bottom of the bottom feeding sleeve 23, the first screen plate 22 drives multiple push rods 50 to push the limiting plate 49 at the bottom of an arc-shaped rack 45 to move laterally back and forth. This causes the arc-shaped rack 45 to drive the second spur gear 46 to rotate back and forth, which in turn drives the one-way screw 44 to drive the spur rack 41 to rotate up and down. At this time, the spur rack 41 drives the first spur gear 43 to rotate back and forth, and drives the multiple shearing plates 40 inside the bottom feeding sleeve 23 to swing back and forth. This allows the ends of the shearing plates 40 to shear the asphalt, so that large pieces of asphalt mixture that have not passed through the screen holes during the screening process are sheared by the shearing plates 40. This prevents the asphalt mixture from clumping inside the feeding sleeve 23 and causing blockage, thus ensuring the stability of subsequent feeding.

[0038] After the crushed asphalt is screened, it falls to the bottom of the screening frame. (Since the method of conveying by the positive pressure pneumatic conveying device 8 is existing technology, this solution does not elaborate on it in detail.) The asphalt is fed from the conveying pipe 9 into the interior of the recycling furnace 10 through the positive pressure pneumatic conveying device 8, and the crushed asphalt is mixed and regenerated.

[0039] The above description is merely 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 device for recycling and regenerating used asphalt mixtures, characterized in that, include: A fixed frame (1) is provided, a crushing chamber (2) is installed on the top of the fixed frame (1), a crushing roller (47) is installed on the inner side of the crushing chamber (2), a feeding channel (3) is installed on the top of the crushing chamber (2), a vibrating screen housing (5) is installed at the bottom of the crushing chamber (2), a positive pressure pneumatic conveying device (8) is installed at the discharge port of the vibrating screen housing (5), a recycling furnace (10) is provided on one side of the fixed frame (1), a conveying pipe (9) is installed between the output end of the positive pressure pneumatic conveying device (8) and the feed port of the recycling furnace (10), and a temperature control component, a reciprocating shearing unit and an auxiliary crushing mechanism are respectively provided on the inner side of the vibrating screen housing (5). The temperature control component includes: Hot air blowers (4) are installed on the outer walls of the crushing chamber (2) and the vibrating screen housing (5), respectively. The air outlet of the hot air blower (4) is connected to the air inlet of the crushing chamber (2) and the vibrating screen housing (5), respectively. The first hot air blower (4) introduces 30-degree hot air into the crushing chamber (2) to preheat the recycled old asphalt mixture. The second hot air blower (4) introduces 60-degree hot air into the vibrating screen housing (5) to preheat the recycled old asphalt mixture again. The reciprocating shearing unit includes a third screen plate (26) fixedly connected to the inner side of the housing (5) of the vibrating screener. Multiple top discharge sleeves (25) are fixedly connected to the inner side of the discharge port of the third screen plate (26). A second screen plate (24) is provided below the third screen plate (26). Multiple bottom discharge sleeves (23) are fixedly connected to the top of the second screen plate (24). The number of bottom discharge sleeves (23) matches the number of top discharge sleeves (25). The outer diameter of the bottom discharge sleeves (23) matches the inner diameter of the top discharge sleeves (25). The top discharge sleeves (25) are sleeved on the outer wall of the bottom discharge sleeves (23). A first screen plate (22) is provided at the bottom of the second screen plate (24). The sieve aperture of the first screen plate (22) matches the aperture of the top discharge sleeves (25). The reciprocating shearing unit also includes movable frames (7) respectively disposed on both sides of the vibrating screen housing (5). A second fixed seat (19) is fixedly connected to the bottom inner side of the movable frame (7). A large bevel gear (20) is rotatably connected to the top of the second fixed seat (19). A second shaft (29) is rotatably connected to the inner side of the movable frame (7). A small bevel gear (31) meshing with the large bevel gear (20) is fixedly connected to one end of the second shaft (29). A protective plate (37) is fixedly connected to one side of the movable frame (7), and the two sides of the second screen plate (24) are respectively fixedly connected to one of the protective plates (37). The other end of the shaft (29) extends through to the outside of the protective plate (37) and is fixedly connected to a rotating circular plate (27). A sleeve shaft (34) is fixedly connected to one side of the rotating circular plate (27). A sleeve rod (28) is provided on one side of the rotating circular plate (27), and the sleeve rod (28) is sleeved on the outer wall of the sleeve shaft (34). A connecting shaft rod (35) is fixedly connected to one side of the sleeve shaft (34). A fixing block (36) is fixedly connected to one end of the connecting shaft rod (35). The top of the fixing block (36) is fixedly connected to the bottom of the first screen plate (22). A drive assembly for driving the large bevel gear (20) to rotate is provided on the inner side of the moving frame (7).

2. The old asphalt mixture recycling and regeneration device according to claim 1, characterized in that, A first motor (11) is fixedly connected to one side of the housing (5) of the vibrating screen. The execution end of the first motor (11) extends through the interior of the housing (5) of the vibrating screen and is fixedly connected to a rotating roller (12). Multiple material carrier plates (13) are fixedly connected to the outer wall of the rotating roller (12).

3. The old asphalt mixture recycling and regeneration device according to claim 1, characterized in that, The protective plate (37) is slidably connected to the housing (5) of the vibrating screen through the auxiliary slide groove (38), and a second trapezoidal slide rail (32) is fixedly connected to one side of the protective plate (37). A trapezoidal slide groove (33) matching the second trapezoidal slide rail (32) is opened on the inner side of the first screen plate (22). The first screen plate (22) is slidably connected to the outer side of the second trapezoidal slide rail (32) through the trapezoidal slide groove (33) opened on the inner side.

4. The old asphalt mixture recycling and regeneration device according to claim 1, characterized in that, The drive assembly includes two sets of first fixed seats (14) respectively fixedly connected to both sides of the housing (5) of the vibrating screen. Each set of first fixed seats (14) has two units. A second motor (30) is fixedly connected to one side of the set of first fixed seats (14) located on the same side. The execution end of the second motor (30) extends through to the outside of the first fixed seat (14) and is fixedly connected to a second reciprocating screw (17). One end of the second reciprocating screw (17) is fixedly connected to the first reciprocating screw through a columnar connecting rod (16). (15), and one end of the first reciprocating screw (15) is rotatably connected to the first fixed seat (14), and the inner side of the other first fixed seat (14) is rotatably connected to the limiting slide rod (18). The outer walls of the first reciprocating screw (15) and the second reciprocating screw (17) are threadedly connected to the moving frame (7), and the inner side of the moving frame (7) is provided with a second slide groove that matches the limiting slide rod (18). The moving frame (7) is slidably connected to the limiting slide rod (18) through the second slide groove.

5. The old asphalt mixture recycling and regeneration device according to claim 4, characterized in that, The outer wall of the columnar connecting rod (16) is fixedly connected to two first trapezoidal slide rails (21), and the interior of the large bevel gear (20) is provided with a first slide groove that matches the first trapezoidal slide rail (21). The large bevel gear (20) is slidably connected to the outer wall of the first trapezoidal slide rail (21) through the first slide groove.

6. The old asphalt mixture recycling and regeneration device according to claim 1, characterized in that, The auxiliary crushing mechanism includes multiple third fixed seats (52) fixedly connected to the inner side of each bottom feeding sleeve (23). A shearing plate (40) is rotatably connected to the inner side of each third fixed seat (52) via a first shaft (6). A protective frame (39) is fixedly connected to one side of each third fixed seat (52). One end of the first shaft (6) extends through to the outside of the third fixed seat (52) and is fixedly connected to a first spur gear (43). Each bottom feeding sleeve (23) has a through groove matching the first spur gear (43) inside. A spur rack (41) meshes with one side of each first spur gear (43). Multiple spur racks (41) are fixedly connected to each other via a connecting ring (42). A third sliding groove matching the connecting ring (42) is opened on the inner side of the bottom feeding sleeve (23). The connecting ring (42) is slidably connected to the bottom feeding sleeve (23) via the third sliding groove.

7. The old asphalt mixture recycling and regeneration device according to claim 6, characterized in that, The auxiliary crushing mechanism also includes an arc-shaped guide rod (48) rotatably connected inside the bottom feeding sleeve (23). One end of the arc-shaped guide rod (48) is fixedly connected to an arc-shaped rack (45). A limiting plate (49) is fixedly connected to the bottom of both the arc-shaped rack (45) and the bottom of the arc-shaped guide rod (48). A push rod (50) is provided between the two limiting plates (49). One end of the push rod (50) is fixedly connected to the top of the first screen plate (22). A second straight rod is engaged on one side of the arc-shaped rack (45). The gear (46) has a one-way screw (44) fixedly connected to the top of the second spur gear (46). One end of the one-way screw (44) passes through the outside of one of the spur racks (41) and is threadedly connected to the spur rack (41). The one-way screw (44) is rotatably connected to the bottom feeding sleeve (23). The inner side of the bottom feeding sleeve (23) is provided with a fourth sliding groove that matches the spur rack (41). The spur rack (41) is slidably connected to the bottom feeding sleeve (23) through the fourth sliding groove.

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