Asphalt reclaimed material multi-stage separation equipment and separation method

Abstract

The invention belongs to the technical field of asphalt recovery and separation, and particularly relates to asphalt reclaimed material multi-stage separation equipment and a separation method.The asphalt reclaimed material multi-stage separation equipment comprises a machine body, a feeding port is formed in the upper surface of the machine body, a crushing roller is rotationally arranged in the feeding port, and a first discharging port is formed in one side of the machine body; a first sieve plate is fixedly connected to the position, corresponding to the first discharging opening, in the machine body; a multi-stage screening assembly is arranged in the machine body and comprises a second screening plate, a second discharging opening is formed in the position, corresponding to the second screening plate, of the machine body, a third screening plate is arranged below the second screening plate, and the third screening plate is fixedly connected into the machine body. Large asphalt and stones often fall down together with a lot of small asphalt stones, so that the problem that the small asphalt blocks do not pass through sieve pores is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of asphalt recovery and separation, and in particular relates to a multi-stage separation device and a separation method for asphalt recovery materials. Background Art

[0002] When using asphalt to pave the ground, a large amount of residue will be generated during the construction process. In addition, in the production of modified asphalt, it is necessary to make asphalt, fillers and admixtures compatible at a higher temperature. However, after the temperature is cooled, the asphalt solidifies and produces a lot of waste. When recycling asphalt waste, it is necessary to screen the asphalt waste for subsequent recycling.

[0003] The working principle of the existing road asphalt separation device is mainly to separate the asphalt materials by vibration or crushing. In vibration separation, the exciting force generated by the vibrator causes the aggregate to be continuously thrown up and dropped on the screen surface while moving forward. Aggregates of different specifications can be separated by configuring screens with different apertures. In crushing separation, the equipment first physically crushes the asphalt material through crushing tools such as toothed rollers and hammers, and then classifies the crushed materials by particle size through a separation system.

[0004] However, the existing road asphalt separation device has 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 carry many smaller asphalt stones with them and fall down together, resulting in smaller asphalt blocks not passing 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. In addition, traditional separation devices also face the problem of easy clogging. Since asphalt and stones often contain more impurities and fine particles, these substances tend to accumulate on the screen. When asphalt of similar size to the screen holes passes through the screen holes, it is more likely to get stuck in the screen holes, causing the screen holes to become clogged, further reducing the separation efficiency.

[0005] To this end, the present invention provides a multi-stage separation device and a separation method for asphalt recycled materials. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve the technical problem is as follows: the multi-stage separation equipment and separation method of asphalt recycled materials described in the present invention comprises a machine body, the upper surface of the machine body is provided with a feed port, a crushing roller is rotatably arranged inside the feed port, a first discharge port is opened on one side of the machine body, and a first sieve plate is fixedly connected to a position corresponding to the first discharge port inside the machine body; A multi-stage screening assembly is arranged inside the machine body, the multi-stage screening assembly includes a second screen plate, a second discharge port is opened at a position of the machine body corresponding to the second screen plate, a third screen plate is arranged below the second screen plate, the third screen plate is fixed inside the machine body, the multi-stage screening assembly can perform multi-stage screening on the 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; A slow screen assembly is arranged inside the machine body, and the slow screen assembly includes a rotating column rotatably arranged inside the machine body, and a plurality of elastically connected sliding rods are arranged on the circumferential surface of the rotating column, and the plurality of sliding rods abut against the first screen plate when the sliding rods rotate to the bottom, and the sliding rods can block and push up the asphalt blocks and stones sliding down from the inclined first screen plate; A second guide plate is fixedly connected to a position of one side of the machine body corresponding to the first material outlet, and a first guide plate is fixedly connected to a position of the machine body corresponding to the second material outlet.

[0008] Preferably, the slow screen assembly also includes a support platform fixedly connected to one side of the machine body, a first motor is fixedly connected to the upper surface of the support platform, a rotating shaft is fixedly connected to the output end of the first motor, a rotating column is fixedly connected 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.

[0009] Preferably, a plurality of connecting grooves are provided on the circumferential surface of the rotating column, a plurality of sliding grooves are provided inside the rotating column, the connecting grooves and the sliding grooves penetrate each other, springs are fixedly connected to both sides of the inner wall of the sliding groove, and the ends of the two springs close to each other are fixedly connected to the same sliding rod.

[0010] Preferably, when the sliding rod moves the asphalt blocks and stones rolling down the first screen plate, it will encounter larger asphalt. When two large asphalt blocks are stuck between the two sliding rods, the rotating column continues to rotate, and the force of the asphalt and stones corresponding to the two sliding rods increases. At this time, the two sliding rods will be subjected to two forces on both sides, and then the two asphalt blocks pass through the sliding rod. The sliding rod plays a blocking role, and the sliding rod can slide along the connecting groove within the range of the connecting groove to adapt to the size of the asphalt blocks and stones.

[0011] Preferably, a hook block is fixedly connected to the end of each sliding rod, and the hook block can hook the contact point of the asphalt block or the stone during the rotation of the sliding rod. A fixed column is fixedly connected to the inside of the body, and a plurality of auxiliary rods are fixedly connected to the circumferential surface of the fixed column. The auxiliary rods are arranged so that when the weight of the asphalt block is exactly the same as the elastic extrusion force between the two sliding rods, the asphalt block will be stuck between the two sliding rods, and the auxiliary rod can push the asphalt block stuck between the two sliding rods down.

[0012] Preferably, the output end of the first motor is transmission-connected to a conveyor belt, the conveyor belt is transmission-connected to a connecting shaft, the connecting shaft is transmission-connected to two groups of connecting belts, a paddle plate is fixedly connected between the two groups of connecting belts, the paddle plate abuts against the second screen plate, a plurality of positioning grooves are provided on the surface of the paddle plate, and the positioning grooves can move the asphalt blocks on the surface of the second paddle plate.

[0013] Preferably, a fixing rod is provided on one side of the connecting belt, 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 blocks clamped in the positioning grooves, and the fixing rod is fixedly connected to the inner wall of the machine body.

[0014] Preferably, a plurality of positioning cavities are provided inside the dial plate, an inner wall of each positioning cavity is fixedly connected to an electric permanent magnet block, one side of each electric permanent magnet block is fixedly connected to a compression spring, one end of the compression spring is fixedly connected to a protrusion, and a side wall of one of the positioning grooves is fixedly connected to a spring sheet.

[0015] Preferably, the paddle plate moves with the connection belt, and when it is located on the lower surface of the connection belt, it abuts against the upper surface of the second sieve plate, and blocks the asphalt blocks through the positioning grooves, so that the asphalt blocks corresponding to the holes of the second sieve plate can be prevented from being carried away by large asphalt blocks and rolling out of the first guide plate; when the paddle plate contacts the positioning blocks, one of the positioning blocks will squeeze the spring sheet, and the built-in pressure sensor of the paddle plate receives a signal, and gives a power-off signal to the permanent magnet blocks in several positioning cavities, so that the 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 elastic force of the compression spring; when the permanent magnet blocks are energized, the magnetic protrusions compress the compression springs, so that after power is off, the compression springs expand and retract and reset, and the connection belt continues to rotate, driving the paddle plate to abut against the upper surface of the first sieve plate, thereby dredging the sieve holes of the first sieve plate.

[0016] A multi-stage separation method for asphalt recycling: Step 1: Preparation: Preliminary cleaning of the road recycling materials to be screened, such as waste asphalt, concrete blocks, gravel, etc., to remove large debris and entanglements; Step 2: Screening: evenly feed the prepared recycled material into the feed port of the screening equipment, and after preliminary 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 in time or replace the severely worn screen; Step 3: Shutdown: After completing the screening operation, stop feeding the mixed material into the feed port, and stop the screening equipment after all the materials on the screen have passed, cut off the power supply or power source, and ensure that the equipment stops running completely.

[0017] The beneficial effects of the present invention are as follows: 1. The multi-stage separation equipment and separation method of asphalt recycling materials described in the present invention crushes asphalt blocks into smaller asphalt blocks by a crushing roller, and then these particles fall on the first screen plate for preliminary screening. Since the sieve holes of the first screen plate are larger, larger stones and asphalt blocks will remain on the screen plate, while smaller particles will fall through the sieve holes. Then, the materials remaining on the first screen plate are blocked and pushed upward by the sliding rod under the action of the slow screening component, which slows down the sliding speed, so that the materials can be more evenly distributed on the screen plate, giving the asphalt and stones that can pass through the sieve holes of the first screen plate sufficient time and falling area, thereby improving the screening efficiency. At the same time, the materials screened off the first screen plate will fall on the second screen plate for further screening. The sieve holes of the second screen plate are smaller and can separate medium-sized particles. Finally, the remaining materials fall on the third screen plate. The sieve holes of the third screen plate are the smallest and can separate the finest particles. The materials screened at each level are discharged through the first discharge port, the second discharge port, etc., respectively, to achieve multi-stage separation.

[0018] 2. The present invention describes a multi-stage separation device and method for recycled asphalt. The paddle plate moves with the connecting belt. When the paddle plate is located on the lower surface of the connecting belt, it abuts against the upper surface of the second sieve plate, and blocks the asphalt blocks through the positioning grooves, so that the asphalt blocks corresponding to the holes of the second sieve plate will not be entrained by large asphalt blocks and roll out from the first guide plate. When the paddle plate contacts the positioning blocks, one of the positioning blocks will squeeze the spring sheet, and the built-in pressure sensor of the paddle plate receives a signal, giving a power-off signal to the permanent magnet blocks in several positioning cavities. The 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 elastic force of the compression spring. When the permanent magnet blocks are energized, the magnetic attraction protrusions compress the compression springs. Therefore, after power failure, the compression springs expand and retract and reset, and the connecting belt continues to rotate, driving the paddle plate to abut against the upper surface of the first sieve plate, thereby unblocking the sieve holes of the first sieve plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] Figure 1 is a three-dimensional diagram of the first embodiment of the present invention; Figure 2 It is a schematic diagram of the internal structure of the body of the present invention; Figure 3 It is a schematic diagram of the structure of the slow screening assembly of the present invention; Figure 4 is a cross-sectional view of the paddle of the present invention; Figure 5 is a cross-sectional view of a rotating column of the present invention; In the figure: 1, machine body; 11, first discharge port; 12, second discharge port; 13, first sieve plate; 14, second sieve plate; 15, third sieve plate; 16, first guide plate; 17, second guide plate; 2. Feeding port; 21. Crushing roller; 3. Support platform; 31. First motor; 32. Rotating shaft; 33. Conveyor belt; 34. Connecting shaft; 35. Connecting belt; 36. Paddle plate; 37. Positioning slot; 38. Positioning cavity; 39. Electro-permanent magnet block; 310. Compression spring; 311. Bump; 312. Shrapnel; 313. Fixed rod; 314. Positioning block; 315. Rotating column; 316. Sliding slot; 317. Sliding rod; 318. Spring; 319. Connecting slot; 320. Hook block; 321. Fixed column; 322. Auxiliary rod. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0022] Embodiment 1: Figures 1 to 5 As shown, a multi-stage separation device and separation method for asphalt recycling material according to an embodiment of the present invention comprises a machine body 1, wherein a feed port 2 is arranged on the upper surface of the machine body 1, a crushing roller 21 is rotatably arranged inside the feed port 2, a first discharge port 11 is provided on one side of the machine body 1, a first sieve plate 13 is fixedly connected to a position corresponding to the first discharge port 11 inside the machine body 1; a multi-stage screening assembly is arranged inside the machine body 1, the multi-stage screening assembly comprises a second sieve plate 14, a second discharge port 12 is provided on the machine body 1 at a position corresponding to the second sieve plate 14, a third sieve plate 15 is arranged below the second sieve plate 14, the third sieve plate 15 is fixedly connected to the inside of the machine body 1, the multi-stage screening assembly can perform multi-stage screening on the asphalt and stone mixture, the sieve holes on the surface of the first sieve plate 13 are larger than the sieve holes on the surface of the second sieve plate 14, and the sieve holes on the surface of the second sieve plate 14 are larger than the sieve holes on the surface of the third sieve plate 15; a slow screening assembly is arranged inside the machine body 1, the slow screening assembly comprises a rotatably arranged The internal rotating column 315 has a plurality of elastically connected sliding rods 317 arranged on the circumferential surface thereof. When the plurality of sliding rods 317 rotate to the bottom, they abut against the first sieve plate 13. The sliding rods 317 can block and push up the asphalt blocks and stones sliding down from the inclined first sieve plate 13. A second guide plate 17 is fixedly connected to a position of the first discharge port 11 on one side of the machine body 1, and a first guide plate 16 is fixedly connected to a position of the second discharge port 12 on the machine body 1.

[0023] Specifically, the existing road asphalt separation device has many shortcomings in the separation process. The separation process is slow and limited to single-stage separation, which means that during the separation process, larger asphalt and stones often carry many smaller asphalt stones and fall together, resulting in smaller asphalt blocks not passing through the sieve holes, resulting in low separation efficiency and low separation quality, which not only affects the reuse value of asphalt, but also brings many inconveniences to subsequent road construction; Therefore, the present invention solves this problem by setting a certain structure. First, when the equipment is running, the asphalt and stone mixture enters the machine body 1 through the feed port 2, and is first crushed into smaller asphalt blocks by the crushing roller 21. Subsequently, these particles fall on the first screen plate 13 for preliminary screening. Since the sieve holes of the first screen plate 13 are relatively large, larger stones and asphalt blocks will remain on the screen plate, while smaller particles will fall through the sieve holes. Subsequently, the materials remaining on the first screen plate 13 are blocked and pushed upward by the sliding rod 317 under the action of the slow screening assembly, thereby slowing down the sliding speed, so that the materials can be easily removed. The material can be more evenly distributed on the sieve plate, giving the asphalt and stones that can pass through the sieve holes of the first sieve plate 13 enough time and falling area, thereby improving the screening efficiency. At the same time, the material screened off the first sieve plate 13 will fall on the second sieve plate 14 for further screening. The sieve holes of the second sieve plate 14 are smaller and can separate medium-sized particles. Finally, the remaining material falls on the third sieve plate 15. The sieve holes of the third sieve plate 15 are the smallest and can separate the finest particles. The materials screened at each level are discharged through the first discharge port 11, the second discharge port 12, etc., respectively, to achieve multi-stage separation; The multi-stage separation device realizes fine screening of asphalt and stone mixture through multi-stage screening components, improves screening efficiency and screening quality, and the setting of slow screening components effectively slows down the material sliding speed, avoids material accumulation and blockage, and at the same time allows the asphalt and stones that can pass through the sieve holes of the first sieve plate 13 to have sufficient falling area, sufficient space and time to fall from the sieve holes, further improving the screening efficiency; The problem that during the single-stage screening process, larger asphalt and stones often carry many smaller asphalt stones with them and fall down together, resulting in the smaller asphalt blocks not passing through the sieve holes, is solved.

[0024] like Figure 1 As shown, the slow screen assembly of this embodiment also includes a support platform 3 fixedly connected to one side of the body 1, a first motor 31 is fixedly connected to the upper surface of the support platform 3, a rotating shaft 32 is fixedly connected to the output end of the first motor 31, a rotating column 315 is fixedly connected to the circumferential surface of the rotating shaft 32, and a plurality of sliding rods 317 are slidably connected to the circumferential surface of the rotating column 315.

[0025] Specifically, in the slow screening assembly, the first motor 31 drives the rotating shaft 32 to rotate, thereby driving the sliding rods 317 on the circumferential surface of the rotating column 315 to make circular motion. When the sliding rods 317 rotate to the lowest point, they contact the first screen plate 13, blocking and pushing up the sliding material, thereby slowing down the sliding speed of the material and improving the screening efficiency.

[0026] 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 penetrate each other, and springs 318 are fixedly connected to both sides of the inner wall of the sliding groove 316, and the ends of the two springs 318 close to each other are fixedly connected to the same sliding rod 317.

[0027] When the sliding rod 317 moves the asphalt blocks and stones rolling down the first screen plate 13, it will encounter larger asphalt. When two large asphalt blocks are stuck between the two sliding rods 317, the rotating column 315 continues to rotate, and the force of the asphalt and stones corresponding to the two sliding rods 317 increases. At this time, the two sliding rods 317 will be subjected to two forces to both sides, and then the two asphalt blocks pass through the sliding rods 317. The sliding rods 317 play a blocking role. The sliding rods 317 can slide along the connecting grooves 319 within the range of the connecting grooves 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 springs 318 will deform, and the two sliding rods will slide in the opposite direction to absorb the impact force and protect the sliding rods 317 and the screen plate from damage.

[0028] like Figure 3 As shown, in this embodiment, a hook block 320 is fixedly connected to the end of each sliding rod 317. When the sliding rod 317 rotates, the hook block 320 can hook the contact point of the asphalt block or the stone. A fixed column 321 is fixedly connected to the inside of the body 1, and a plurality of auxiliary rods 322 are fixedly connected to the circumferential surface of the fixed column 321. The auxiliary rod 322 is arranged 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, and the auxiliary rod 322 can push the asphalt block stuck between the two sliding rods 317 down.

[0029] Specifically, the hook block 320 fixed to the end of the sliding rod 317 enables 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, thereby realizing the functions of blocking and pushing up. When the weight of the asphalt block or stone is balanced with the elastic squeezing force between the two sliding rods 317, that is, the weight of the asphalt block is just equal to the squeezing force generated by the elastic 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 columns 321 fixed to the inside of the body 1 come into play. They can passively push these stuck asphalt blocks, helping them to fall smoothly and continue to participate in the screening process.

[0030] Embodiment 2: Figures 1 to 5As shown, compared with Example 1, another implementation of the present invention is: the output end of the first motor 31 is transmission-connected to the conveyor belt 33, the conveyor belt 33 is transmission-connected to the connecting shaft 34, the connecting shaft 34 is transmission-connected to two groups of connecting belts 35, a paddle plate 36 is fixedly connected between the two groups of connecting belts 35, the paddle plate 36 is in contact with the second sieve plate 14, and a plurality of positioning grooves 37 are provided on the surface of the paddle plate 36, and the positioning grooves 37 can paddle the asphalt blocks on the surface of the second paddle plate 36.

[0031] Specifically, the first motor 31 drives the connecting shaft 34 to rotate through the conveyor belt 33, thereby driving 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, thereby promoting the uniform distribution and screening of the material on the second screen plate 14.

[0032] like Figure 3 As shown, a fixing rod 313 is provided on one side of the connecting belt 35 of this embodiment, and a plurality of positioning blocks 314 are fixedly connected to the circumferential surface of the fixing rod 313. The plurality of positioning blocks 314 can clean the asphalt blocks stuck in the positioning groove 37, and the fixing rod 313 is fixedly connected to the inner wall of the body 1.

[0033] Specifically, the fixing rod 313 and the positioning block 314 on the circumferential surface thereof are arranged 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 paddle 36. When an asphalt block is stuck in the positioning groove 37, the positioning block 314 can push it out to achieve a cleaning effect. The fixing rod 313 is fixedly connected to the inner wall of the body 1, ensuring the stability and continuity of the cleaning process.

[0034] like Figure 4 As shown, a plurality of positioning cavities 38 are provided inside the dial plate 36 of the present embodiment, and an electro-permanent magnet block 39 is fixedly connected to the inner wall of each positioning cavity 38, and 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, and a spring piece 312 is fixedly connected to the side wall of one of the positioning grooves 37.

[0035] In addition, the traditional separation device also faces the problem of easy clogging. As asphalt and stone often contain more impurities and fine particles, these substances 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, further reducing the separation efficiency. The paddle plate 36 moves with the connecting belt 35. When it is located on the lower surface of the connecting belt 35, the paddle plate 36 abuts against the upper surface of the second sieve plate 14, and blocks the asphalt blocks through the positioning grooves 37, so that the asphalt blocks corresponding to the holes of the second sieve plate 14 can not be entrained by the large asphalt blocks and roll out of the first guide plate 16. When the paddle plate 36 contacts the positioning blocks 314, one of the positioning blocks 314 will squeeze the spring piece 312, and the built-in pressure sensor of the paddle plate 36 will receive a signal, giving a certain The electric permanent magnet block 39 in the positioning cavity 38 receives a power-off signal, and the electric permanent magnet block 39 loses its magnetism. The protrusion 311, which is partially made of elastic material, extends out of the positioning cavity 38 under the action of the elastic force of the compression spring 310. When the electric permanent magnet block 39 is energized, the magnetic protrusion 311 compresses the compression spring 310. Therefore, after power is off, the compression spring 310 retracts and resets, and the connecting belt 35 continues to rotate, driving the paddle plate 36 to abut against the upper surface of the first sieve plate 13, thereby dredging the sieve holes of the first sieve plate 13.

[0036] Specifically, A multi-stage separation method for asphalt recycling: Step 1: Preparation: Preliminary cleaning of the road recycling materials to be screened, such as waste asphalt, concrete blocks, gravel, etc., to remove large debris and entanglements; Step 2: Screening: The prepared recycled materials are evenly fed into the feed port 2 of the screening equipment, and after preliminary crushing by the crushing roller 21, they fall 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 in time or the severely worn screen is replaced; Step 3: Shutdown: After completing the screening operation, stop feeding the mixed material into the feed port 2, and stop the screening equipment after all the materials on the screen have passed, cut off the power supply or power source, and ensure that the equipment stops running completely.

[0037] Working principle: first, when the equipment is running, the asphalt and stone mixture enters the machine body 1 through the feed port 2, and is first crushed into smaller asphalt blocks by the crushing roller 21. Subsequently, these particles fall on the first screen plate 13 for preliminary screening. Since the sieve holes of the first screen plate 13 are larger, larger stones and asphalt blocks will remain on the screen plate, while smaller particles will fall through the sieve holes. Then, the materials remaining on the first screen plate 13 are blocked and pushed upward by the sliding rod 317 under the action of the slow screening component, slowing down the sliding speed. When the sliding rod 317 pushes the asphalt blocks and stones rolling down the first screen plate 13, it will encounter larger asphalt. When the two large When the asphalt block is stuck between the two sliding rods 317, the rotating column 315 continues to rotate, and the force of the asphalt and the stone corresponding to the two sliding rods 317 increases. At this time, the two sliding rods 317 will be subjected to two forces to the sides, and then the two asphalt blocks pass through the sliding rods 317. The sliding rods 317 play a blocking role. The sliding rods 317 can slide along the connecting grooves 319 within the range of the connecting grooves 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 springs 318 will be deformed, and the two sliding rods will slide in the opposite direction to absorb the impact force and protect the sliding rods 317 and the screen plate from damage. The setting of the sliding rod 317 enables the material to be more evenly distributed on the screen plate, giving the asphalt and stones that can pass through the sieve holes of the first screen plate 13 enough time and falling area, thereby improving the screening efficiency. At the same time, the material screened off the first screen plate 13 will fall on the second screen plate 14 for further screening. The second screen plate 14 has smaller sieve holes and can separate medium-sized particles. Finally, the remaining material falls on the third screen plate 15. The third screen plate 15 has the smallest sieve holes and can separate the finest particles. The materials screened at each level are discharged through the first discharge port 11, the second discharge port 12, etc., respectively, to achieve multi-stage separation; In addition, the first motor 31 drives the connecting shaft 34 to rotate through the conveyor belt 33, thereby driving the two sets of connecting belts 35 and the paddle plate 36 to move synchronously. The paddle plate 36 abuts against the second sieve plate 14, and the positioning groove 37 on its surface can effectively paddle the asphalt blocks on the second sieve plate 14 during the rotation process, thereby promoting the uniform distribution and screening of the materials on the second sieve plate 14. The fixing rod 313 and the positioning block 314 on the circumferential surface thereof are arranged on one side of the connecting belt 35. As the connecting belt 35 moves, the positioning block 314 periodically contacts the positioning groove 37 on the paddle 36. When an asphalt block is stuck in the positioning groove 37, the positioning block 314 can push it out to achieve a cleaning effect. The fixing rod 313 is fixed to the inner wall of the body 1, which ensures the stability and continuity of the cleaning process. In addition, the paddle plate 36 moves with the connecting belt 35. When it is located on the lower surface of the connecting belt 35, the paddle plate 36 abuts against the upper surface of the second sieve plate 14, and blocks the asphalt blocks through the positioning grooves 37, so that the asphalt blocks corresponding to the holes of the second sieve plate 14 can not be entrained by large asphalt blocks and roll out of the first guide plate 16. When the paddle plate 36 contacts the positioning blocks 314, one of the positioning blocks 314 will squeeze the spring piece 312, and the built-in pressure sensor of the paddle plate 36 receives the signal, giving The electric permanent magnet blocks 39 in the positioning cavities 38 receive a power-off signal, and the electric permanent magnet blocks 39 lose their magnetism. The protrusions 311, which are partially made of elastic material, extend out of the positioning cavities 38 under the action of the elastic force of the compression springs 310. When the electric permanent magnet blocks 39 are energized, the magnetic protrusions 311 compress the compression springs 310. Therefore, after power is off, the compression springs 310 retract and reset, and the connecting belt 35 continues to rotate, driving the paddle plate 36 to abut against the upper surface of the first sieve plate 13, thereby dredging the sieve holes of the first sieve plate 13.

[0038] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A multi-stage separation device for recycled asphalt, comprising a body (1), wherein the upper surface of the body (1) is provided with a feed port (2), a crushing roller (21) is rotatably provided inside the feed port (2), a first discharge port (11) is provided on one side of the body (1), and a first sieve plate (13) is fixedly connected to a position inside the body (1) corresponding to the first discharge port (11), characterized in that: A multi-stage screening component is arranged inside the machine body (1), the multi-stage screening component comprises a second screen plate (14), a second discharge port (12) is provided at a position of the machine body (1) corresponding to the second screen plate (14), a third screen plate (15) is arranged below the second screen plate (14), the third screen plate (15) is fixedly connected to the inside of the machine body (1), the multi-stage screening component can perform multi-stage screening on the 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), 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 screen assembly is arranged inside the machine body (1), and the slow screen assembly comprises a rotating column (315) rotatably arranged inside the machine body (1), and a plurality of elastically connected sliding rods (317) are arranged on the circumferential surface of the rotating column (315), and when the plurality of sliding rods (317) rotate to the bottom, they abut against the first screen plate (13), and the sliding rods (317) can block and push up asphalt blocks and stones sliding down from the inclined first screen plate (13); A second guide plate (17) is fixedly connected to a position of a side of the machine body (1) corresponding to the first material outlet (11), and a first guide plate (16) is fixedly connected to a position of the machine body (1) corresponding to the second material outlet (12).

2. The multi-stage separation equipment for recycled asphalt according to claim 1, characterized in that: The slow screen assembly also includes a support platform (3) fixedly connected to one side of the machine body (1), a first motor (31) being fixedly connected to the upper surface of the support platform (3), a rotating shaft (32) being fixedly connected to the output end of the first motor (31), a rotating column (315) being fixedly connected to the circumferential surface of the rotating shaft (32), and a plurality of sliding rods (317) being slidably connected to the circumferential surface of the rotating column (315).

3. The multi-stage separation equipment for recycled asphalt according to claim 2, characterized in that: 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) penetrate each other, and springs (318) are fixedly connected to both sides of the inner wall of the sliding groove (316), and the ends of the two springs (318) close to each other are fixedly connected to the same sliding rod (317).

4. The multi-stage separation equipment for recycled asphalt according to claim 3, characterized in that: When the sliding rod (317) moves the asphalt blocks and stones rolling down along the first screen plate (13), it encounters larger asphalt. When two large asphalt blocks are stuck between the two sliding rods (317), the rotating column (315) continues to rotate, and the force of the asphalt and stones on the two sliding rods (317) increases. At this time, the two sliding rods (317) are subjected to two forces in both sides, and then the two asphalt blocks 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.

5. The multi-stage separation equipment for recycled asphalt according to claim 4, characterized in that: A hook block (320) is fixedly connected to the end of each sliding rod (317). When the sliding rod (317) rotates, the hook block (320) can hook the contact point of the asphalt block or the stone. A fixed column (321) is fixedly connected inside the body (1). A plurality of auxiliary rods (322) are fixedly connected to the circumferential surface of the fixed column (321). The auxiliary rods (322) are arranged so that when the weight of an 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), and the auxiliary rods (322) can push the asphalt block stuck between the two sliding rods (317) down.

6. The multi-stage separation equipment for recycled asphalt according to claim 2, characterized in that: The output end of the first motor (31) is drivingly connected to a conveyor belt (33), the conveyor belt (33) is drivingly connected to a connecting shaft (34), the connecting shaft (34) is drivingly connected to two groups of connecting belts (35), a shifting plate (36) is fixedly connected between the two groups of connecting belts (35), the shifting plate (36) is in contact with the second sieve plate (14), a plurality of positioning grooves (37) are formed on the surface of the shifting plate (36), and the positioning grooves (37) are capable of shifting asphalt blocks on the surface of the second shifting plate (36).

7. The multi-stage separation equipment for recycled asphalt according to claim 6, characterized in that: A fixing rod (313) is provided on one side of the connecting belt (35), and a plurality of positioning blocks (314) are fixedly connected to the circumferential surface of the fixing rod (313). The plurality of positioning blocks (314) can clean asphalt blocks clamped in the positioning grooves (37). The fixing rod (313) is fixedly connected to the inner wall of the machine body (1).

8. The multi-stage separation equipment for recycled asphalt according to claim 6, characterized in that: A plurality of positioning cavities (38) are provided inside the dial plate (36), the inner wall of each positioning cavity (38) is fixedly connected to an electric permanent magnet block (39), one side of each electric permanent magnet block (39) is fixedly connected to a compression spring (310), one end of the compression spring (310) is fixedly connected to a protrusion (311), and a side wall of one of the positioning grooves (37) is fixedly connected to a spring sheet (312).

9. The multi-stage separation equipment for recycled asphalt according to claim 8, characterized in that: The paddle plate (36) moves along with the connecting belt (35). When the paddle plate (36) is located on the lower surface of the connecting belt (35), the paddle plate (36) abuts against the upper surface of the second sieve plate (14), and blocks the asphalt blocks through the positioning grooves (37), so that the asphalt blocks corresponding to the holes of the second sieve plate (14) are not entrained by large asphalt blocks and roll out of the first guide plate (16). When the paddle plate (36) contacts the positioning blocks (314), one of the positioning blocks (314) presses the spring sheet (312), and a built-in pressure sensor of the paddle plate (36) receives a signal. , a power-off signal is given to the electric permanent magnet blocks (39) in the positioning cavities (38), the electric permanent magnet blocks (39) lose their magnetism, and the protrusions (311) made of elastic material partially extend out of the positioning cavity (38) under the action of the elastic force of the compression spring (310). When the electric permanent magnet blocks (39) are powered on, the magnetic protrusions (311) compress the compression spring (310), so that after power is off, the compression spring (310) retracts and resets, and the connecting belt (35) continues to rotate, driving the paddle plate (36) to abut against the upper surface of the first sieve plate (13), thereby clearing the blockage of the sieve holes of the first sieve plate (13).

10. A method for multi-stage separation of recycled asphalt is applied to a multi-stage separation device for recycled asphalt according to any one of claims 1 to 9, characterized in that: Step 1: Preparation: Preliminary cleaning of the road recycling materials to be screened (such as waste asphalt, concrete blocks, gravel, etc.) to remove large debris and entanglements; Step 2: Screening: The prepared recycled material is evenly fed into the feed port (2) of the screening equipment, and after being initially crushed by the crushing roller, 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 in time or the severely worn screen is replaced; Step 3: Stopping the machine: After the screening operation is completed, stop feeding the mixed material into the feed port (2). After all the materials on the screen have passed through, stop the screening equipment and cut off the power supply or power source to ensure that the equipment stops running completely.

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