A multi-stage separation device and separation method for recycled asphalt materials

Abstract

This invention belongs to the field of asphalt recycling and separation technology, specifically a multi-stage separation device and method for asphalt recycling materials. It includes a machine body with a feed inlet on its upper surface. A crushing roller is rotatably mounted inside the feed inlet. A first discharge outlet is located on one side of the machine body. A first screen plate is fixedly connected inside the machine body corresponding to the first discharge outlet. A multi-stage screening assembly is installed inside the machine body, including a second screen plate. A second discharge outlet is located on the machine body corresponding to the second screen plate. A third screen plate is located below the second screen plate and fixedly connected inside the machine body. By incorporating a slow-release screening assembly, the problem is solved in single-stage screening where larger asphalt and stones often carry many smaller asphalt and stone pieces down with them, causing the smaller asphalt pieces to not pass through the screen openings.

Description

Technical Field

[0001] This invention belongs to the field of asphalt recycling and separation technology, specifically a multi-stage separation device and method for asphalt recycled materials. Background Technology

[0002] When using asphalt to pave the ground, a large amount of residue is generated during the construction process. In addition, the production of modified asphalt requires the asphalt, fillers, and admixtures to achieve compatibility at high temperatures. However, after the temperature cools down, the asphalt solidifies, producing a lot of waste. When recycling asphalt waste, it is necessary to screen the asphalt waste for subsequent recycling processing.

[0003] The existing road asphalt separation devices mainly work by using vibration or crushing to separate asphalt materials. In vibration separation, the excitation force generated by the vibrator causes the aggregate to be continuously thrown up and down on the screen surface while moving forward. By configuring screens with different aperture sizes, aggregates of different specifications can be separated. In crushing separation, the equipment first physically crushes the asphalt material using crushing tools such as toothed rollers and hammers, and then the crushed material is classified according to particle size through the separation system.

[0004] However, existing road asphalt separators have many shortcomings in the separation process. The separation process is slow and limited to single-stage separation. This means that during the separation process, larger asphalt and stones often fall together with many smaller asphalt stones, causing the smaller asphalt stones to not pass through the sieve holes, resulting in low separation efficiency and low separation quality. This not only affects the reuse value of asphalt, but also brings many inconveniences to subsequent road construction.

[0005] In addition, traditional separation devices also face the problem of easy clogging. Asphalt and stones often contain a lot of impurities and fine particles, which are easy to accumulate on the screen. When asphalt with a similar size to the screen hole passes through the screen hole, it is easier to get stuck in the screen hole, causing the screen hole to be blocked and further reducing the separation efficiency.

[0006] Therefore, the present invention provides a multi-stage separation device and separation method for asphalt recycled materials. Summary of the Invention

[0007] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0008] The technical solution adopted by the present invention to solve its technical problem is: the multi-stage separation equipment and separation method for asphalt recycled material of the present invention includes a machine body, an inlet is provided on the upper surface of the machine body, a crushing roller is rotatably arranged inside the inlet, a first outlet is opened on one side of the machine body, and a first screen plate is fixedly connected inside the machine body at the position corresponding to the first outlet.

[0009] The machine body is equipped with a multi-stage screening assembly, which includes a second screen plate. The machine body has a second discharge port at the position corresponding to the second screen plate. A third screen plate is arranged below the second screen plate and is fixed inside the machine body. The multi-stage screening assembly can perform multi-stage screening of asphalt and stone mixture. The screen holes on the surface of the first screen plate are larger than the screen holes on the surface of the second screen plate, and the screen holes on the surface of the second screen plate are larger than the screen holes on the surface of the third screen plate.

[0010] The machine body is equipped with a slow screening assembly, which includes a rotating column rotatably disposed inside the machine body. Several sliding rods are elastically connected on the circumferential surface of the rotating column. When the sliding rods rotate to the bottom, they abut against the first screen plate. The sliding rods can block and push up asphalt blocks and stones sliding off the inclined first screen plate.

[0011] A second guide plate is fixedly connected to one side of the machine body at the position corresponding to the first discharge port, and a first guide plate is fixedly connected to the position of the machine body at the position corresponding to the second discharge port.

[0012] Preferably, the slow screening assembly further includes a support platform fixed to one side of the machine body. A first motor is fixed to the upper surface of the support platform, a rotating shaft is fixed to the output end of the first motor, a rotating column is fixed to the circumferential surface of the rotating shaft, and a plurality of sliding rods are slidably connected to the circumferential surface of the rotating column.

[0013] Preferably, the rotating column has several connecting grooves on its circumferential surface and several sliding grooves inside the rotating column. The connecting grooves and sliding grooves are connected through each other. Springs are fixed to both sides of the inner wall of the sliding groove, and the same sliding rod is fixed to one end of two springs that are close to each other.

[0014] Preferably, when the sliding rod moves the asphalt blocks and stones rolling down the first screen plate, it will encounter larger asphalt blocks. When two large asphalt blocks are stuck between the two sliding rods, the continuous rotation of the rotating column increases the force of the asphalt and stones on the two sliding rods. At this time, the two sliding rods will be subjected to two forces to both sides. Then, the two asphalt blocks pass through the sliding rods, and the sliding rods play a blocking role. The sliding rods can slide along the connecting groove and within the range of the connecting groove to adapt to the size of the asphalt blocks and stones.

[0015] Preferably, each of the sliding rods has a hook block fixedly attached to its end. During the rotation of the sliding rod, the hook block can hook onto the contact point of the asphalt block or stone. A fixed column is fixedly attached inside the machine body. Several auxiliary rods are fixedly attached to the circumference of the fixed column. The auxiliary rods are designed so that when the weight of an asphalt block is exactly the same as the elastic compressive force between two sliding rods, the asphalt block will be stuck between the two sliding rods, and the auxiliary rods can push the asphalt block stuck between the two sliding rods off.

[0016] Preferably, the output end of the first motor is driven by a conveyor belt, the conveyor belt is driven by a connecting shaft, the connecting shaft is driven by two sets of connecting belts, a lever plate is fixed between the two sets of connecting belts, the lever plate abuts against the second screen plate, and the surface of the lever plate is provided with a plurality of positioning grooves, the positioning grooves being able to move the asphalt blocks on the surface of the second lever plate.

[0017] Preferably, a fixing rod is provided on one side of the connecting belt, and a plurality of positioning blocks are fixedly connected to the circumferential surface of the fixing rod. The plurality of positioning blocks can clean the asphalt block stuck in the positioning groove, and the fixing rod is fixedly connected to the inner wall of the machine body.

[0018] Preferably, the dial plate has several positioning cavities inside, each positioning cavity has an electro-permanent magnet block fixed to its inner wall, each electro-permanent magnet block has a compression spring fixed to one side, one end of the compression spring has a protrusion fixed to it, and one of the positioning grooves has a spring piece fixed to its side wall.

[0019] Preferably, as the connecting belt moves, when the lever is located on the lower surface of the connecting belt, it abuts against the upper surface of the second screen plate. The positioning groove blocks the asphalt blocks, preventing the asphalt blocks corresponding to the holes of the second screen plate from being dragged out of the first guide plate by large asphalt blocks. When the lever contacts the positioning block, one of the positioning blocks will squeeze the spring. The built-in pressure sensor of the lever receives the signal and sends a power-off signal to the electro-permanent magnet blocks in several positioning cavities. The electro-permanent magnet blocks lose their magnetism, and some of the protrusions made of elastic material extend out of the positioning cavity under the action of the spring force. When the electro-permanent magnet blocks are energized, they magnetically attract the protrusions and compress the spring. Therefore, after the power is cut off, the spring extends and returns to its original position, and the connecting belt continues to rotate, causing the lever to abut against the upper surface of the first screen plate, thus clearing the blockage of the screen holes of the first screen plate.

[0020] A multi-stage separation method for recycled asphalt:

[0021] Step 1: Preparation: Perform preliminary cleaning on the road recycling materials to be screened, such as waste asphalt, concrete blocks, and gravel, to remove large pieces of debris and tangled materials;

[0022] Step 2: Screening: The prepared recycled material is evenly fed into the feed inlet of the screening equipment. After initial crushing by the crushing roller, it falls onto the first screen plate. Monitor the screening process, observe the screening effect and the wear of the screen, and adjust the screening parameters or replace the severely worn screen in a timely manner.

[0023] Step 3: Shutdown: After the screening operation is completed, stop feeding the mixture into the feed inlet. Wait until all the material on the screen has passed through before stopping the screening equipment, disconnecting the power supply or power source, and ensuring that the equipment stops running completely.

[0024] The beneficial effects of this invention are as follows:

[0025] 1. The present invention discloses a multi-stage separation device and method for recycled asphalt material. Asphalt blocks are crushed into smaller blocks by a crushing roller. These particles then fall onto a first screen plate for preliminary screening. Due to the larger screen openings of the first screen plate, larger stones and asphalt blocks remain on the screen plate, while smaller particles fall through. Next, the material remaining on the first screen plate is blocked and pushed upwards by a sliding rod under the action of a slowing screening component, slowing down the downward speed and allowing the material to be more evenly distributed on the screen plate. This provides sufficient time and falling area for asphalt and stones that can pass through the screen openings of the first screen plate, improving screening efficiency. Simultaneously, the material screened off the first screen plate falls onto a second screen plate for further screening. The second screen plate has smaller screen openings, capable of separating medium-sized particles. Finally, the remaining material falls onto a third screen plate with the smallest screen openings, capable of separating the finest particles. The materials screened at each stage are discharged through a first discharge port, a second discharge port, etc., achieving multi-stage separation.

[0026] 2. The multi-stage separation equipment and method for recycled asphalt described in this invention involves a deflector plate moving with the connecting belt. When the deflector plate is located on the lower surface of the connecting belt, it abuts against the upper surface of the second screen plate. The positioning grooves prevent asphalt blocks from being trapped and rolled out of the first guide plate by large asphalt blocks. When the deflector plate contacts the positioning blocks, one of the positioning blocks will squeeze the spring. The built-in pressure sensor of the deflector plate receives the signal and sends a power-off signal to the electro-permanent magnet blocks in several positioning cavities. The electro-permanent magnet blocks lose their magnetism, and some of the protrusions, which are made of elastic material, extend out of the positioning cavity under the action of the spring force. When the electro-permanent magnet blocks are energized, they magnetically attract the protrusions and compress the spring. Therefore, after the power is cut off, the spring returns to its original position, and the connecting belt continues to rotate, causing the deflector plate to abut against the upper surface of the first screen plate, thus clearing the blockage of the screen holes of the first screen plate. Attached Figure Description

[0027] The invention will now be further described with reference to the accompanying drawings.

[0028] Figure 1 This is a perspective view of Embodiment 1 of the present invention;

[0029] Figure 2 This is a schematic diagram of the internal structure of the body of the present invention;

[0030] Figure 3 This is a schematic diagram of the structure of the slow screening component of the present invention;

[0031] Figure 4 This is a cross-sectional view of the dial of the present invention;

[0032] Figure 5 This is a cross-sectional view of the rotating column of the present invention;

[0033] In the diagram: 1. Machine body; 11. First discharge port; 12. Second discharge port; 13. First screen plate; 14. Second screen plate; 15. Third screen plate; 16. First guide plate; 17. Second guide plate;

[0034] 2. Feed inlet; 21. Crushing roller;

[0035] 3. Support platform; 31. First motor; 32. Rotating shaft; 33. Conveyor belt; 34. Connecting shaft; 35. Connecting belt; 36. Paddle plate; 37. Positioning groove; 38. Positioning cavity; 39. Electro-permanent magnet block; 310. Compression spring; 311. Protrusion; 312. Spring piece; 313. Fixing rod; 314. Positioning block; 315. Rotating column; 316. Sliding groove; 317. Sliding rod; 318. Spring; 319. Connecting groove; 320. Hook block; 321. Fixing column; 322. Auxiliary rod. Detailed Implementation

[0036] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0037] Example 1: As Figures 1 to 5As shown in the figure, an embodiment of the present invention discloses a multi-stage separation device and method for asphalt recycling, comprising a machine body 1, an inlet 2 on the upper surface of the machine body 1, a crushing roller 21 rotatably disposed inside the inlet 2, a first outlet 11 on one side of the machine body 1, and a first screen plate 13 fixedly connected inside the machine body 1 corresponding to the first outlet 11; a multi-stage screening assembly is disposed inside the machine body 1, including a second screen plate 14, a second outlet 12 on the machine body 1 corresponding to the second screen plate 14, and a third screen plate 15 disposed below the second screen plate 14 and fixedly connected inside the machine body 1. The multi-stage screening assembly can perform multi-stage screening of asphalt and stone mixtures. The screen holes on the surface of the first screen plate 13 are larger than the screen holes on the surface of the second screen plate 14, and the screen holes on the surface of the second screen plate 14 are larger than the screen holes on the surface of the third screen plate 15; a slow screening assembly is disposed inside the machine body 1, the slow screening assembly including a rotatably disposed inside the machine body 1. The internal rotating column 315 has several elastically connected sliding rods 317 on its circumferential surface. When the sliding rods 317 rotate to the bottom, they abut against the first screen plate 13. The sliding rods 317 can block and push up asphalt blocks and stones that slide off the inclined first screen plate 13. A second guide plate 17 is fixedly connected to one side of the machine body 1 at the position corresponding to the first discharge port 11, and a first guide plate 16 is fixedly connected to the machine body 1 at the position corresponding to the second discharge port 12.

[0038] Specifically, existing road asphalt separators have many shortcomings in the separation process. The separation process is slow and limited to single-stage separation. This means that during the separation process, larger asphalt and stones often fall together with many smaller asphalt stones, causing the smaller asphalt stones to not pass through the sieve holes, resulting in low separation efficiency and low separation quality. This not only affects the reuse value of asphalt but also brings many inconveniences to subsequent road construction.

[0039] Therefore, this invention solves this problem by setting a certain structure. Firstly, when the equipment is running, the asphalt and stone mixture enters the machine body 1 through the feed inlet 2. It is first crushed into smaller asphalt blocks by the crushing roller 21. Then, these particles fall onto the first screen plate 13 for preliminary screening. Because the screen holes of the first screen plate 13 are relatively large, larger stones and asphalt blocks remain on the screen plate, while smaller particles fall through the screen holes. Next, the material remaining on the first screen plate 13 is blocked and pushed upwards by the sliding rod 317 under the action of the slow-screening component, slowing down the downward speed and allowing the material to fall more smoothly. The material can be more evenly distributed on the screen plate, giving asphalt and stones enough time and falling area to pass through the screen holes of the first screen plate 13, thus improving screening efficiency. At the same time, the material screened off the first screen plate 13 will fall onto the second screen plate 14 for further screening. The screen holes of the second screen plate 14 are smaller and can separate medium-sized particles. Finally, the remaining material falls onto the third screen plate 15. The screen holes of the third screen plate 15 are the smallest and can separate the finest particles. The materials screened at each stage are discharged through the first discharge port 11, the second discharge port 12, etc., to achieve multi-stage separation.

[0040] This multi-stage separation equipment achieves fine screening of asphalt and stone mixture through multi-stage screening components, improving screening efficiency and screening quality. The setting of the slow screening component effectively slows down the material's downward speed, avoiding material accumulation and blockage. At the same time, it allows asphalt and stones that can pass through the 13 screen holes of the first screen plate to have sufficient falling area, space and time to fall from the screen holes, further improving screening efficiency.

[0041] This solves the problem that in single-stage screening, larger asphalt and stones often carry many smaller asphalt and stone pieces down with them, causing the smaller asphalt pieces to not pass through the sieve holes.

[0042] like Figure 1 As shown, the slow screening assembly in this embodiment also includes a support platform 3 fixed to one side of the machine body 1. A first motor 31 is fixed to the upper surface of the support platform 3. A rotating shaft 32 is fixed to the output end of the first motor 31. A rotating column 315 is fixed to the circumferential surface of the rotating shaft 32. Several sliding rods 317 are slidably connected to the circumferential surface of the rotating column 315.

[0043] Specifically, in the slow screening assembly, the first motor 31 drives the rotating shaft 32 to rotate, which in turn drives the sliding rod 317 on the circumferential surface of the rotating column 315 to make a circular motion. When the sliding rod 317 rotates to the lowest point, it contacts the first screen plate 13, which blocks and pushes the sliding material upward, thereby slowing down the material's downward speed and improving the screening efficiency.

[0044] like Figure 5As shown, in this embodiment, a plurality of connecting grooves 319 are provided on the circumferential surface of the rotating column 315, and a plurality of sliding grooves 316 are provided inside the rotating column 315. The connecting grooves 319 and the sliding grooves 316 pass through each other. Springs 318 are fixedly connected to both sides of the inner wall of the sliding groove 316, and the same sliding rod 317 is fixedly connected to one end of the two springs 318 that are close to each other.

[0045] When the sliding rod 317 moves the asphalt blocks and stones rolling down the first screen plate 13, it will encounter larger asphalt blocks. When two large asphalt blocks are stuck between the two sliding rods 317, the continuous rotation of the rotating column 315 increases the force of the asphalt and stones on the two sliding rods 317. At this time, the two sliding rods 317 will be subjected to two forces to both sides. Then the two asphalt blocks pass through the sliding rods 317, and the sliding rods 317 play a blocking role. The sliding rods 317 can slide along the connecting groove 319 and within the range of the connecting groove 319 to adapt to the size of the asphalt blocks and stones. At the same time, when the sliding rods 317 are subjected to material resistance, the spring 318 will deform and the two sliding rods will slide in opposite directions to absorb the impact force and protect the sliding rods 317 and the screen plate from damage.

[0046] like Figure 3 As shown, in this embodiment, each sliding rod 317 has a hook block 320 fixedly connected to its end. During the rotation of the sliding rod 317, the hook block 320 can hook the contact point of the asphalt block or stone. A fixed column 321 is fixedly connected inside the machine body 1. Several auxiliary rods 322 are fixedly connected to the circumferential surface of the fixed column 321. The auxiliary rods 322 are set so that when the weight of the asphalt block is exactly the same as the elastic extrusion force between the two sliding rods 317, the asphalt block will be stuck between the two sliding rods 317. The auxiliary rods 322 can pull the asphalt block stuck between the two sliding rods 317 off.

[0047] Specifically, the hook block 320 fixed to the end of the sliding rod 317 allows the hook block 320 to more effectively hook the contact point of the asphalt block or stone during the rotation of the sliding rod 317, achieving the functions of blocking and pushing upward. When the weight of the asphalt block or stone is balanced with the elastic extrusion force between the two sliding rods 317, that is, when the weight of the asphalt block is exactly equal to the extrusion force generated by the spring force of the two sliding rods 317 due to the elastic force of the spring 318, the asphalt block may be temporarily stuck between the two sliding rods 317. At this time, the auxiliary rods 322 on the fixed column 321 fixed inside the machine body 1 play a role. They can passively push these stuck asphalt blocks, helping them to fall smoothly and continue to participate in the screening process.

[0048] Example 2: Figures 1 to 5As shown in the comparative embodiment one, another embodiment of the present invention is as follows: the output end of the first motor 31 is driven to be connected to a conveyor belt 33, the conveyor belt 33 is driven to be connected to a connecting shaft 34, the connecting shaft 34 is driven to be connected to two sets of connecting belts 35, a paddle plate 36 is fixed between the two sets of connecting belts 35, the paddle plate 36 abuts against the second screen plate 14, and a plurality of positioning grooves 37 are provided on the surface of the paddle plate 36, the positioning grooves 37 can move the asphalt blocks on the surface of the second paddle plate 36.

[0049] Specifically, the first motor 31 drives the connecting shaft 34 to rotate via the conveyor belt 33, which in turn drives the two sets of connecting belts 35 and the paddle plate 36 to move synchronously. The paddle plate 36 abuts against the second screen plate 14, and the positioning groove 37 on its surface can effectively move the asphalt blocks on the second screen plate 14 during rotation, promoting the uniform distribution and screening of materials on the second screen plate 14.

[0050] like Figure 3 As shown, in this embodiment, a fixing rod 313 is provided on one side of the connecting belt 35. Several positioning blocks 314 are fixedly attached to the circumferential surface of the fixing rod 313. The positioning blocks 314 can clean the asphalt block stuck in the positioning groove 37. The fixing rod 313 is fixedly attached to the inner wall of the machine body 1.

[0051] Specifically, the fixed rod 313 and the positioning block 314 on its circumferential surface are provided on one side of the connecting belt 35. As the connecting belt 35 moves, the positioning block 314 will periodically contact the positioning groove 37 on the push plate 36. When an asphalt block is stuck in the positioning groove 37, the positioning block 314 can push it out to achieve the cleaning effect. The fixed rod 313 is fixed to the inner wall of the machine body 1 to ensure the stability and continuity of the cleaning process.

[0052] like Figure 4 As shown, in this embodiment, the inside of the dial plate 36 is provided with several positioning cavities 38. Each positioning cavity 38 has an electro-permanent magnet block 39 fixedly connected to its inner wall. Each electro-permanent magnet block 39 has a compression spring 310 fixedly connected to one side. One end of the compression spring 310 is fixedly connected to a protrusion 311. A spring piece 312 is fixedly connected to the side wall of one of the positioning grooves 37.

[0053] In addition, traditional separation devices also face the problem of easy clogging. Asphalt and stones often contain a lot of impurities and fine particles, which are easy to accumulate on the screen. When asphalt with a similar size to the screen hole passes through the screen hole, it is easier to get stuck in the screen hole, causing the screen hole to be blocked and further reducing the separation efficiency.

[0054] As the connecting belt 35 moves, when the deflector 36 is located on the lower surface of the connecting belt 35, it abuts against the upper surface of the second screen plate 14. The positioning groove 37 blocks the asphalt blocks, preventing large asphalt blocks from being carried away by the asphalt blocks and rolling out of the first guide plate 16. When the deflector 36 contacts the positioning block 314, one of the positioning blocks 314 will squeeze the spring 312. The built-in pressure sensor of the deflector 36 receives the signal and applies a pressure... When the power is cut off to the electro-permanent magnet 39 inside the positioning cavity 38, the electro-permanent magnet 39 loses its magnetism. The protrusions 311, which are made of elastic material, extend out of the positioning cavity 38 under the action of the spring 310. When the electro-permanent magnet 39 is energized, it magnetically attracts the protrusions 311 and compresses the spring 310. Therefore, after the power is cut off, the spring 310 extends and returns to its original position, and the connecting belt 35 continues to rotate, causing the dial plate 36 to abut against the upper surface of the first sieve plate 13, thus clearing the blockage of the sieve holes of the first sieve plate 13.

[0055] Specifically,

[0056] A multi-stage separation method for recycled asphalt:

[0057] Step 1: Preparation: Perform preliminary cleaning on the road recycling materials to be screened, such as waste asphalt, concrete blocks, and gravel, to remove large pieces of debris and tangled materials;

[0058] Step 2: Screening: The prepared recycled material is evenly fed into the feed inlet 2 of the screening equipment. After initial crushing by the crushing roller 21, it falls onto the first screen plate 13. The screening process is monitored, the screening effect and the wear of the screen are observed, and the screening parameters are adjusted or the severely worn screen is replaced in time.

[0059] Step 3: Shutdown: After the screening operation is completed, stop feeding the mixture into the feed inlet 2. Wait until all the material on the screen has passed through before stopping the screening equipment, disconnect the power supply or power source, and ensure that the equipment stops running completely.

[0060] Working principle: First, during equipment operation, the asphalt and stone mixture enters the machine body 1 through the feed inlet 2. It is initially crushed into smaller asphalt blocks by the crushing roller 21. These particles then fall onto the first screen plate 13 for preliminary screening. Due to the large screen openings of the first screen plate 13, larger stones and asphalt blocks remain on the screen plate, while smaller particles fall through the openings. Next, the material remaining on the first screen plate 13 is blocked and pushed upwards by the sliding rod 317 under the action of the slow-screening component, slowing its downward speed. When the sliding rod 317 pushes the asphalt blocks and stones rolling down the first screen plate 13, it encounters larger asphalt blocks. When two large... When the asphalt block gets stuck between the two sliding rods 317, the continuous rotation of the rotating column 315 increases the force between the asphalt and the stone block on the two sliding rods 317. At this time, the two sliding rods 317 will be subjected to two forces to both sides. Then the two asphalt blocks pass through the sliding rods 317, and the sliding rods 317 play a blocking role. The sliding rods 317 can slide along the connecting groove 319 and within the range of the connecting groove 319 to adapt to the size of the asphalt block and the stone block. At the same time, when the sliding rods 317 are subjected to material resistance, the spring 318 will deform and the two sliding rods will slide in opposite directions to absorb the impact force and protect the sliding rods 317 and the screen plate from damage.

[0061] The sliding rod 317 allows the material to be distributed more evenly on the screen plate, giving asphalt and stones sufficient time and falling area to pass through the screen holes of the first screen plate 13, thus improving screening efficiency. At the same time, the material screened off the first screen plate 13 will fall onto the second screen plate 14 for further screening. The screen holes of the second screen plate 14 are smaller, which can separate medium-sized particles. Finally, the remaining material falls onto the third screen plate 15. The screen holes of the third screen plate 15 are the smallest, which can separate the finest particles. The materials screened at each stage are discharged through the first discharge port 11, the second discharge port 12, etc., to achieve multi-stage separation.

[0062] Furthermore, the first motor 31 drives the connecting shaft 34 to rotate via the conveyor belt 33, which in turn drives the two sets of connecting belts 35 and the paddle plate 36 to move synchronously. The paddle plate 36 abuts against the second screen plate 14, and the positioning groove 37 on its surface can effectively agitate the asphalt blocks on the second screen plate 14 during rotation, promoting the uniform distribution and screening of materials on the second screen plate 14.

[0063] Furthermore, the fixed rod 313 and the positioning block 314 on its circumferential surface are provided on one side of the connecting belt 35. As the connecting belt 35 moves, the positioning block 314 will periodically contact the positioning groove 37 on the push plate 36. When an asphalt block is stuck in the positioning groove 37, the positioning block 314 can push it out to achieve the cleaning effect. The fixed rod 313 is fixed to the inner wall of the machine body 1 to ensure the stability and continuity of the cleaning process.

[0064] Additionally, as the connecting belt 35 moves, when the deflector 36 is located on the lower surface of the connecting belt 35, it abuts against the upper surface of the second screen plate 14. The positioning groove 37 blocks the asphalt blocks, preventing large asphalt blocks from being carried away by the asphalt blocks and rolling out of the first guide plate 16. When the deflector 36 contacts the positioning block 314, one of the positioning blocks 314 will squeeze the spring 312. The built-in pressure sensor of the deflector 36 receives the signal and... When the power is cut off to the electro-permanent magnets 39 in several positioning cavities 38, the electro-permanent magnets 39 lose their magnetism. The protrusions 311, which are made of elastic material, extend out of the positioning cavity 38 under the action of the spring 310. When the electro-permanent magnets 39 are energized, they magnetically attract the protrusions 311 and compress the spring 310. Therefore, after the power is cut off, the spring 310 retracts and returns to its original position, and the connecting belt 35 continues to rotate, causing the dial plate 36 to abut against the upper surface of the first sieve plate 13, thus clearing the blockage of the sieve holes of the first sieve plate 13.

[0065] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-stage separation device for recycled asphalt, comprising a body (1), wherein a feed inlet (2) is provided on the upper surface of the body (1), a crushing roller (21) is rotatably arranged inside the feed inlet (2), a first discharge outlet (11) is provided on one side of the body (1), and a first screen plate (13) is fixedly connected inside the body (1) at a position corresponding to the first discharge outlet (11), characterized in that: The machine body (1) is equipped with a multi-stage screening component. The multi-stage screening component includes a second screen plate (14). The machine body (1) has a second discharge port (12) at the position corresponding to the second screen plate (14). A third screen plate (15) is provided below the second screen plate (14). The third screen plate (15) is fixed inside the machine body (1). The multi-stage screening component can perform multi-stage screening of asphalt and stone mixture. The screen holes on the surface of the first screen plate (13) are larger than the screen holes on the surface of the second screen plate (14). The screen holes on the surface of the second screen plate (14) are larger than the screen holes on the surface of the third screen plate (15). The machine body (1) is equipped with a slow screening assembly. The slow screening assembly includes a rotating column (315) rotatably disposed inside the machine body (1). Several elastically connected sliding rods (317) are disposed on the circumferential surface of the rotating column (315). When the several sliding rods (317) rotate to the bottom end, they abut against the first screen plate (13). The sliding rods (317) can block and push up asphalt blocks and stones that slide down from the inclined first screen plate (13). A second guide plate (17) is fixedly connected to one side of the machine body (1) at the position corresponding to the first discharge port (11), and a first guide plate (16) is fixedly connected to the machine body (1) at the position corresponding to the second discharge port (12). The slow screening assembly also includes a support platform (3) fixed to one side of the machine body (1). A first motor (31) is fixed to the upper surface of the support platform (3). A rotating shaft (32) is fixed to the output end of the first motor (31). A rotating column (315) is fixed to the circumferential surface of the rotating shaft (32). Several sliding rods (317) are slidably connected to the circumferential surface of the rotating column (315). The output end of the first motor (31) is connected to a conveyor belt (33), the conveyor belt (33) is connected to a connecting shaft (34), the connecting shaft (34) is connected to two sets of connecting belts (35), and a lever (36) is fixed between the two sets of connecting belts (35). The lever (36) abuts against the second screen plate (14), and the surface of the lever (36) is provided with several positioning grooves (37). The positioning grooves (37) can move the asphalt blocks on the surface of the second screen plate (14). A fixing rod (313) is provided on one side of the connecting strip (35). Several positioning blocks (314) are fixed on the circumferential surface of the fixing rod (313). Several positioning blocks (314) can clean the asphalt block stuck in the positioning groove (37). The fixing rod (313) is fixed to the inner wall of the machine body (1). The inside of the dial (36) is provided with a plurality of positioning cavities (38), and an electro-permanent magnet block (39) is fixedly connected to the inner wall of each positioning cavity (38). A compression spring (310) is fixedly connected to one side of each electro-permanent magnet block (39), and a protrusion (311) is fixedly connected to one end of the compression spring (310). A spring piece (312) is fixedly connected to the side wall of one of the positioning grooves (37). As the connecting belt (35) moves, when the paddle (36) is located on the lower surface of the connecting belt (35), it abuts against the upper surface of the second screen plate (14). The positioning groove (37) blocks the asphalt blocks, preventing the asphalt blocks corresponding to the holes of the second screen plate (14) from being carried away by large asphalt blocks and rolling out of the first guide plate (16). When the paddle (36) contacts the positioning block (314), one of the positioning blocks (314) will squeeze the spring piece (312), and the built-in pressure sensor of the paddle (36) receives the signal. When the permanent magnet blocks (39) in several positioning cavities (38) are given a power-off signal, the permanent magnet blocks (39) lose their magnetism, and the protrusions (311) which are partly made of elastic material extend out of the positioning cavity (38) under the action of the spring (310). When the permanent magnet blocks (39) are energized, the magnetic protrusions (311) compress the spring (310). Therefore, after the power is cut off, the spring (310) retracts and resets, and the connecting belt (35) continues to rotate, driving the dial plate (36) to abut against the upper surface of the first sieve plate (13) to clear the sieve holes of the first sieve plate (13).

2. A multi-stage separation apparatus for asphalt recyclate according to claim 1, characterized in that: The rotating column (315) has several connecting grooves (319) on its circumferential surface and several sliding grooves (316) inside the rotating column (315). The connecting grooves (319) and the sliding grooves (316) are connected through each other. Springs (318) are fixed to both sides of the inner wall of the sliding groove (316). The two springs (318) are fixed to the same sliding rod (317) at their closest ends.

3. A multi-stage separation apparatus for asphalt recyclate according to claim 2, characterized in that: When the sliding rod (317) moves the asphalt blocks and stones rolling down the first screen plate (13), it will encounter larger asphalt blocks. When two large asphalt blocks are stuck between the two sliding rods (317), the continuous rotation of the rotating column (315) increases the force of the asphalt and stones on the two sliding rods (317). At this time, the two sliding rods (317) will be subjected to two forces to both sides, and then the two asphalt blocks will pass through the sliding rods (317). The sliding rods (317) play a blocking role. The sliding rods (317) can slide along the connecting groove (319) within the range of the connecting groove (319) to adapt to the size of the asphalt blocks and stones.

4. A multi-stage separation apparatus for asphalt recyclate according to claim 3, characterized in that: Each of the sliding rods (317) has a hook block (320) fixedly attached to its end. During the rotation of the sliding rod (317), the hook block (320) can hook the contact point of the asphalt block or stone. The machine body (1) has a fixed column (321) fixedly attached inside. Several auxiliary rods (322) are fixedly attached to the circumferential surface of the fixed column (321). The auxiliary rods (322) are set so that when the weight of the asphalt block is exactly the same as the elastic extrusion force between the two sliding rods (317), the asphalt block will be stuck between the two sliding rods (317). The auxiliary rods (322) can push the asphalt block stuck between the two sliding rods (317) off.

5. A multi-stage separation method for recycled asphalt, applied to a multi-stage separation device for recycled asphalt according to any one of claims 1-4, characterized in that: Step 1: Preparation: Perform preliminary cleaning on the road recycled material to be screened, removing large pieces of debris and tangled materials; Step 2: Screening: The prepared recycled material is evenly fed into the feed inlet (2) of the screening equipment. After the initial crushing by the crushing roller, it falls onto the first screen plate (13). Monitor the screening process, observe the screening effect and the wear of the screen, and adjust the screening parameters or replace the severely worn screen in time. Step 3: Shutdown: After the screening operation is completed, stop feeding the mixture into the feed inlet (2). Stop the screening equipment after all the material on the screen has passed through, and cut off the power supply or power source to ensure that the equipment stops running completely.

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