Asphalt pavement recycling fine separation regeneration system and separation method

Abstract

The application discloses a kind of asphalt pavement recycled material fine separation regeneration system and separation method, including feed device, screening device, granulating device, separation device and fine screening device, the material meeting the requirement of particle size after screening by screening device enters separation device, separation device is communicated with fine screening device, and fine material meeting the requirement of particle size is obtained by screening;And strip-shaped impurities and recycled material without screening enter granulating device and are broken, granulating device is communicated with grate sorting machine to remove strip-shaped impurities, and recycled material after sorting is returned to screening device and is screened again.The system can accurately grade separation after crushing and separation, realize fine screening, greatly reduce the asphalt content in recycled material with particle size more than 5mm, simultaneously, 0-3mm and 3-5mm fine material can be separated with high efficiency, and hidden trouble of mesh blockage by impurities in subsequent screening and effectively prevent sticky and wet recycled material from sticking screen plate.

Description

Technical Field

[0001] This invention belongs to the field of asphalt pavement recycled material separation technology, and particularly relates to a fine separation and regeneration system and method for asphalt pavement recycled materials. Background Technology

[0002] It is estimated that my country generates 200 million tons of recycled asphalt pavement material annually from major and medium-scale maintenance projects on expressways and national and provincial trunk roads alone. Currently, recycled material is mainly used in the middle and lower layers or base layers of ordinary roads and municipal roads, with a utilization rate generally below 30%. The main reason for this is that the aggregate and asphalt in recycled material exist in the form of "agglomerates," resulting in severe pseudo-particle size phenomena. This leads to poor gradation stability of the mixture, poor fusion of new and old asphalt, and difficulty in meeting the required mixing temperature. All of these factors seriously affect the low-temperature and water stability of recycled asphalt mixtures, and prevent its large-scale application in high-grade highway asphalt pavements (especially the surface layer).

[0003] Recycled materials, especially coarse aggregates, after fine separation and pretreatment, possess quality comparable to virgin aggregates. They can be used in the upper, middle, and lower layers of highways or first-class roads, significantly improving utilization and resulting in substantial economic benefits. Therefore, fine separation and screening pretreatment of recycled materials, while maximizing output, is crucial for solving the aforementioned problems. While existing recycled material separation and screening equipment can crush, separate, and screen recycled materials, addressing the agglomeration problem to some extent, practical use reveals issues with both fine processing and output assurance. For example:

[0004] Patent CN113152209A discloses a recycling equipment and method for asphalt concrete recycled materials. It reduces the agglomeration rate of recycled asphalt concrete materials and obtains asphalt concrete with different particle sizes through crushing, separation, and screening. However, it has difficulty processing recycled materials with particle sizes larger than 40mm; furthermore, it does not consider problems such as reduced output due to clogging of the high-frequency vibrating screen by sticky, fine-particle recycled materials, and the inability to screen out recycled materials of 0-3mm.

[0005] CN110523638A discloses a method for separating fine aggregates from the surface of waste asphalt mixture aggregates. It uses freezing and negative pressure environments to prevent recycled materials from clumping together, thus achieving the goal of removing the asphalt film from the aggregate surface under impact and friction. However, the -40℃ to -10℃ temperature range described in this method is difficult to achieve in complex and large-scale construction environments, and also requires a long freezing period, leading to problems such as insufficient production output. Summary of the Invention

[0006] Purpose of the invention: The first purpose of this invention is to provide a separation and recycling system that can simultaneously screen fine materials and crush and classify large-particle-size asphalt pavement recycled materials.

[0007] A second objective of the present invention is to provide a method for separation using the above-described separation and regeneration system.

[0008] Technical solution: The fine separation and recycling system for asphalt pavement recycled material of the present invention includes a material conveying device, a screening device for primary screening of asphalt pavement recycled material, a pelletizing device and a separation device respectively connected to the screening device.

[0009] Materials that meet the particle size requirements after being screened by the screening device enter the separation device, which is connected to the fine screening device to obtain fine materials that meet the particle size requirements.

[0010] Strip-shaped impurities and recycled materials that have not been screened by the screening device enter the pelletizing device for crushing. The pelletizing device is connected to the grate sorter to sort and remove the strip-shaped impurities. The recycled materials after being sorted by the grate sorter are then conveyed by the conveying device to the screening device for screening until fine materials that meet the particle size requirements are obtained.

[0011] The grate sorting machine includes: a frame, a grate mechanism mounted on the frame, and scraper mechanisms located on the outer sides of both ends of the grate mechanism; wherein, the grate mechanism is used to block and convey impurities in the asphalt pavement recycled material running on the conveying device; it includes a plurality of grates arranged sequentially from left to right, a sliding mechanism for fixing and realizing the left and right sliding of the plurality of grates, the sliding mechanism including a guide rail plate mounted on the frame and having a cross section consistent with the conveying device, the upper ends of the plurality of grates being connected to the lower ends of the guide rail plate through a guide wheel mechanism, the lower ends of the plurality of grates being connected to the sliding guide rail, and a return spring being provided on the grate section between the sliding guide rail and the guide rail plate to realize the up and down movement of the grate; a scraper mechanism is used to scrape off the impurities blocked on the grate; it includes a scraper and a drive assembly for driving the scraper to move back and forth and up and down.

[0012] Furthermore, the pelletizing device and the separating device of the separation and regeneration system are located at the lower end of the screening device and are connected by a chute; the fine screening device is located at the lower end of the separating device and the two are connected by a chute.

[0013] Furthermore, the conveying device of the separation and regeneration system is an elevator, one end of which is connected to the feeding device and the other end is connected to the screening device.

[0014] Furthermore, the separation and regeneration system also includes a support frame for supporting each device.

[0015] Furthermore, the pelletizing device of the separation and regeneration system is connected to the conveying device via a conveying device, and the grate sorter is mounted across the conveying device to block and remove impurities in the asphalt pavement recycled material.

[0016] Furthermore, the separation and regeneration system also includes a dust removal device connected to the screening device, pelletizing device, separation device, and fine screening device.

[0017] Furthermore, the screening device of the separation and regeneration system screens recycled materials with a size of less than 25mm, which then enter the separation device. Unscreened recycled materials with a size of more than 25mm and strip-shaped impurities enter the pelletizing device. The fine screening device screens fine materials with sizes of 0-3mm, 3-5mm, 5-10mm, 10-15mm, or 10-20mm, and the bottom of the fine screening device is respectively equipped with a conveying device that connects to the storage bins of 0-3mm, 3-5mm, 5-10mm, 10-15mm, or 10-20mm.

[0018] Furthermore, the discharge port of the recovery hopper of the dust removal device in the separation and regeneration system is connected to the 0-3mm recovery material discharge conveying device via a screw conveyor.

[0019] The present invention employs the above-mentioned fine separation and recycling system for asphalt pavement recycled materials, and the method for separation includes the following steps:

[0020] Step 1: The asphalt pavement recycled material is conveyed to the screening device for primary screening via the conveying device. After primary screening, the material that meets the particle size requirements enters the separation device to remove the asphalt film. The recycled material separated by the separation device enters the fine screening device for fine screening to obtain fine material that meets the particle size requirements. The recycled material that is left over after screening by the fine screening device is then sorted by the grate sorter and conveyed to the screening device for screening again.

[0021] Step 2: Strip-shaped impurities and recycled materials that have not been screened by the screening device enter the pelletizing device for crushing, and are then sorted by a grate sorter to remove the strip-shaped impurities. The sorted recycled materials are then conveyed by a conveying device to the screening device for further screening.

[0022] Step 3: Repeat steps 1 and 2 until the screening operation is completed.

[0023] Beneficial effects: Compared with the prior art, the significant advantages of the present invention are: by combining a screening device, a pelletizing device, a separating device, a grate sorter and a fine screening device, the system can accurately classify the recycled material after crushing and separation, achieve fine screening, greatly reduce the asphalt content in recycled material with a particle size of 5mm or more, and can efficiently separate 0-3mm and 3-5mm fine materials. It can also effectively prevent wet recycled material from sticking to the screen plate and prevent fine materials from clogging the screen holes, thus significantly improving screening efficiency.

[0024] The combination of the screening device, pelletizing device and grate sorter in this separation and recycling system solves the problem that existing equipment cannot process recycled materials with a particle size of 40mm or more. Furthermore, the combination of the screening device and the grate sorter can screen and remove irregular strip-shaped impurities such as non-woven fabric and anti-crack tape mixed in the recycled asphalt pavement material, making the recycled material cleaner and eliminating the risk of subsequent screening impurities clogging the screen. Attached Figure Description

[0025] Figure 1 This is a structural diagram of the separation and regeneration system of the present invention;

[0026] Figure 2 This is a perspective view of the grate sorting machine of the present invention in conjunction with the return material belt conveyor;

[0027] Figure 3 This is a perspective view of the grate sorting machine of the present invention;

[0028] Figure 4 This is a front view of the grate sorting machine of the present invention;

[0029] Figure 5 This is a schematic diagram of the structure of the grate mechanism of the present invention;

[0030] Figure 6 This is a schematic diagram of the structure of the drive mechanism and the rack plate of the present invention.

[0031] Figure 7 This is a schematic diagram of the scraper mechanism of the present invention;

[0032] Figure 8 This is a process flow diagram of the separation and regeneration system of the present invention. Detailed Implementation

[0033] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings.

[0034] It should be noted that the conveying device 1 used in the recycling system of this invention can be an elevator, the screening device 2 can be a non-blocking screen, the pelletizing device 3 can be a pelletizer, the separating device 4 can be a separator, the fine screening device 5 can be an anti-sticking fine screen, the feeding device 7 can be a raw material feeder, the conveying device 9 can be a belt conveyor, the dust removal device 10 can be a dust collector, and the screw conveyor 12 can be a screw conveyor. All of the above device structures are known technologies and no related structural modifications have been made. All of them can be purchased commercially, and the relevant models are shown in Table 1 below.

[0035] This invention employs a non-obstructive sieve to screen materials up to 25mm in diameter, which then enter the separator. Specifically, during the initial screening, small-diameter materials (below 25mm) are screened into the separator to remove the asphalt film, while larger-diameter materials (above 25mm, generally 25-200mm) and strip-shaped impurities that have not been screened enter a pelletizer for further crushing. Furthermore, the non-stick fine sieve used in this invention can screen four different sizes of fine materials: 0-3mm, 3-5mm, 5-10mm, and 10-15mm (or 10-20mm). Moreover, using the separation and regeneration system of this invention, if it is necessary to screen materials of other sizes not specified in this invention, the sieve plates of the non-obstructive sieve and the non-stick fine sieve can be replaced accordingly, or different specifications of non-obstructive sieves or non-stick fine sieves can be used; it is not limited to the screening specifications required by this application.

[0036] Table 1 Device Model List

[0037] Serial Number Component Name Purchaser 1 hoist NE150-22M 2 Unobstructed screen SG-1231 3 pelletizer PF-1007 4 Separator ZS-1624 5 Anti-stick fine screen AHFTD1560 6 belt conveyor TD75B650*10M 7 dust collector PPCS64-4

[0038] In this invention, the raw material feeder is equipped with three sets of delayed vibrators to prevent the arching of recycled materials, and the belt is driven by frequency conversion speed regulation to feed the material to the elevator according to the output.

[0039] The non-blocking screen's strip-shaped screening plate (with a 25mm gap) vibrates to separate irregular strip-shaped impurities such as non-woven fabric and anti-crack tape from recycled materials, reducing the risk of screen blockage.

[0040] The pelletizer has a processing capacity of 50t / h and a power of 45kW. It is equipped with a frequency converter with a speed range of 1-622 rpm. The rotor speed can be adjusted by frequency conversion of the motor, and the spacing of the impact plate can be adjusted to improve the decomposition effect of large-diameter recycled materials.

[0041] The separator uses dual 90KW motors equipped with frequency converters, with a speed range of 1-1600 rpm. Its motor drive system features dual motors on both sides. Compared to single-sided motor drive, dual motors on both sides extend the life of the rotor bearings, reduce the failure rate, and save energy. This separator has both stone-on-stone and stone-on-iron functions, and the internal impeller and peripheral guard plate wear can be easily inspected through the installation of an inspection port.

[0042] The anti-sticking fine screen uses a dual 11KW motor to drive the eccentric shaft, with a box amplitude of 6-8mm and a screen amplitude of 10-20mm. It is equipped with four layers of screen plates of 3×3mm, 6×6mm, 11×11mm and 15×15mm, or the 15×15mm screen plate can be replaced with a 22×22mm screen plate to screen out recycled / fine materials of 0-3mm, 3-5mm, 5-10mm, 10-15mm (or 10-20mm).

[0043] The dust collector is a bag filter with 4 electromagnetic pulse valves and 4 lifting valves. The filter bags are 130×2450mm with a filtration surface area of ​​24m³. 2 Fan 15 effectively handles an air volume of 18,000 m³ / h. 3 / h; To ensure a stable and clean air supply, air compressor 16 is a screw air compressor, equipped with a 1.0m... 3 The gas storage tank is equipped with low-pressure protection.

[0044] like Figure 1 As shown, the fine separation and recycling system for asphalt pavement recycled material of the present invention includes a raw material feeder and an elevator connected to the discharge port of the raw material feeder to lift the asphalt pavement recycled material (recycled material) into an unobstructed screen for preliminary screening. The discharge port of the elevator can be connected to the feed port of the unobstructed screen, or the two can be connected through a chute 13. The unobstructed screen has two discharge ports. One port is connected to the separator located below it, and the two are also connected through the chute 13. The other port is connected to the pelletizer located below it through the chute 13. That is, the small-diameter recycled material with a particle size of less than 25mm after the initial screening of the unobstructed screen directly enters the separator for further crushing and separation. Irregular strip-shaped impurities such as non-woven fabric and anti-crack tape mixed in the recycled material and large-diameter recycled material with a particle size of more than 25mm, which have not been screened by the unobstructed screen, enter the pelletizer for further crushing of the large-diameter recycled material. The crushed large-diameter recycled material and strip-shaped impurities enter the grate sorter located below the pelletizer to automatically remove the irregular strip-shaped impurities such as non-woven fabric and anti-crack tape mixed in the recycled material, and only the recycled material crushed by the pelletizer is included. The recycled material is transported to the elevator by the belt conveyor and then enters the unobstructed screen for screening again. The pellet mill can be connected to the grate sorter via a chute and belt conveyor. The grate sorter is installed across the belt conveyor. The material on the pellet mill enters the belt conveyor through the chute, and the grate sorter sorts and removes impurities such as strips before transferring it to the elevator.

[0045] The small-diameter recycled material (below 25mm) from the separator is further crushed to remove the asphalt film and then enters the anti-sticking fine screen located below it. The two are connected by a chute. The anti-sticking fine screen separates the recycled material into four grades: 0-3mm, 3-5mm, 5-10mm, and 10-15mm (10-20mm) recycled / fine material. These grades are then transported to their respective storage bins 11 by belt conveyors connected to the anti-sticking fine screen. The recycled material not screened by the anti-sticking fine screen is conveyed to the elevator by belt conveyor and then further screened by a non-obstruction screen. Impurities can be removed by a grate sorter along the way.

[0046] The device described above is supported by a floor-type support frame, forming a four-layer structure that reduces the actual floor space required. Each layer is fixed with bolts for easy installation and disassembly, and a lifting platform facilitates equipment maintenance. Furthermore, the separation and regeneration system of this invention includes a dust collector connected to a non-blocking screen, a separator, a pelletizer, and an anti-sticking fine screen. The discharge port of the dust collector's storage hopper is connected to a 0-3mm recycled material discharge belt conveyor via a screw conveyor, transporting the dust collected by the dust collector to the 0-3mm fine material storage hopper.

[0047] The start-up and shutdown of the device described above can be controlled by the PLC control system 14, realizing the efficient operation of the entire separation and regeneration system.

[0048] In addition to the above, the grate sorting machine used in this invention includes: a frame 17, a grate mechanism disposed on the frame 17, and scraper mechanisms located on the outer sides of both ends of the grate mechanism; wherein, the grate mechanism is used to block and convey impurities in the asphalt pavement recycling material running on the belt conveyor; it includes a plurality of grates 18 arranged sequentially from left to right, and a sliding mechanism for fixing and realizing the left and right sliding of the plurality of grates 18, the sliding mechanism including a component disposed on the frame 17 and having a connection with the belt conveyor. A guide rail plate 19 with a uniform transmission cross section is provided. The upper ends of the plurality of grate bars 18 are connected to the lower end of the guide rail plate 19 through a guide wheel mechanism. The lower ends of the plurality of grate bars 18 are connected to a sliding guide rail. A return spring 20 is provided on the grate bar 18 section located between the sliding guide rail and the guide rail plate 19 to realize the up and down movement of the grate bar 18. A scraper mechanism is used to scrape off the impurities blocked on the grate bar 18. It includes a scraper 21 and a drive assembly for driving the scraper 21 to move back and forth and up and down.

[0049] Furthermore, the sliding guide rail of the grate sorting machine includes a rack plate 22 located at the lower end of several grate bars 18. The rack plate 22 is slidably mounted on the guide rail shaft 24 via a slider 23. The guide rail shaft 24 is fixedly mounted on the frame 17.

[0050] Furthermore, the grate sorting machine also includes a drive mechanism for driving the sliding mechanism to slide. The drive mechanism includes a motor 25, a transmission shaft 26 connected to the motor 25, and a gear 27 disposed on the transmission shaft 26 and meshing with the rack plate 22. The rotation of the gear 27 drives the rack plate 22 to slide left and right.

[0051] Furthermore, the guide wheel mechanism of the grate sorter includes a guide wheel 28 located at the lower end of the guide rail plate 19 and abutting against it. The guide wheel 28 is connected to the grate bar 18 through the guide wheel seat 29.

[0052] Furthermore, the return spring 20 of the grate sorter is connected to the guide wheel seat 29 via the spring seat 30.

[0053] Furthermore, the scraper mechanism of the grate sorter also includes a support plate 31 for supporting the scraper 21. The drive assembly includes a first bracket 32 ​​mounted on the frame 17, and a cylinder 33 mounted on the first bracket 32 ​​for driving the scraper 21 to move back and forth. The telescopic end of the cylinder 33 is connected to a movable bracket 34. The movable bracket 34 and the support plate 31 are connected through a guide rail shaft 24, and a slider 23 is provided on the movable bracket 34 corresponding to the guide rail shaft 24. A second bracket 35 is fixed on the movable bracket 34 between the support plate 31 and the movable bracket 34. The second bracket 35 is equipped with a cylinder 33 for driving the scraper 21 to move up and down, and the telescopic end of the cylinder 33 is connected to the scraper 21.

[0054] Furthermore, the grate sorting machine has two sets of grate mechanisms, arranged on the left and right sides of the drive mechanism; and four sets of scraper mechanisms, located at both ends of the two sets of grate mechanisms.

[0055] Furthermore, the grate sorting machine also includes sensors located at both ends of the frame 17. The sensors detect when the grate bar 18 reaches the end of the frame 17 and feed back to the PLC control system to control the start and stop of the scraper mechanism and the forward and reverse operation of the drive mechanism.

[0056] Furthermore, the grate sorter also includes a U-shaped recycling bin 36 located at the lower end of the scraper mechanism.

[0057] Specifically:

[0058] like Figure 2 As shown, the grate sorter of the present invention spans across the belt conveyor and is used to block, sort and remove impurities in the asphalt pavement recycling material on the belt conveyor.

[0059] like Figure 3 and Figure 4 As shown, the grate sorting machine includes a frame 17, a grate mechanism mounted on the frame 17, a drive mechanism for moving the grate mechanism, scraper mechanisms located on the outer sides of both ends of the grate mechanism, and a U-shaped recycling bin 36 located at the lower end of the scraper mechanism. The U-shaped recycling bin 36 is fixedly mounted on the frame 17. There are two sets of grate mechanisms, identical in length and structure, positioned on the left and right sides of the frame 17 respectively, thus performing double screening of impurities in the asphalt pavement recycling material. This grate sorting machine primarily uses the grate mechanism to block and sort impurities in the asphalt pavement recycling material before transporting it to the scraper mechanism for removal. There are four sets of scraper mechanisms, located on the outer sides of both ends of the two sets of grate mechanisms, thus removing impurities from each side and each end of the grate mechanism.

[0060] Among them, such as Figure 5As shown, the grate mechanism includes several grates 18 arranged laterally along the frame 17 and a sliding mechanism for fixing the grates 18 and allowing them to slide left and right. The lengths of the grates 18 in the two sets of grate mechanisms are slightly different to adapt to the inclination of the belt conveyor. The sliding mechanism includes a guide plate 19 spanning and fixed to the frame 17, on which the grates 18 are arranged sequentially. The guide plate 19 has a portion that matches the conveying cross section of the belt conveyor, which is located directly above the belt conveyor. The guide plate 19 is preferably a U-shaped guide plate, i.e., a U-shaped groove is provided in the middle, so that the lower ends of the grates 18 on the guide plate 19 corresponding to the belt surface of the belt conveyor always maintain a 5mm gap with the belt surface. This effectively blocks impurities in the asphalt pavement recycled material while allowing the material to pass through, without causing collision or friction between the grates 18 and the belt surface of the belt conveyor. The top ends of the grate bars 18 are fixedly connected to the guide rail plate 19 via guide wheels 28 and guide wheel seats 29, and the two are fixed by pins 39. The guide wheels 28 allow the grate bars 18 to conform to the shape of the guide rail plate 19 during sliding. A rack plate 22 is connected to the middle ends of several grate bars 18, and the rack plate 22 is connected to the guide rail shaft 24 via sliders 23 and positioned by linear bearings 38. The guide rail shaft 24 is also mounted across the frame 17, and the movement of the rack plate 22 drives the grate bars 18 to slide along the guide rail plate 19.

[0061] A return spring 20 is provided on the grate bar 18 section located between the guide rail plate 19 and the rack plate 22, and the other end of the return spring 20 is provided on the rack plate 22 through the spring seat 30. That is, the return spring 20 is provided between the guide wheel seat 29 and the spring seat 30. The return spring 20 is positioned by the linear bearing 38, which allows the grate bar 18 to move up and down within the linear bearing 38. That is, through the arrangement of the return spring 20 and the guide rail plate 19, the grate bar 18 can move up and down to adapt to the cross-sectional shape of the belt conveyor, thereby effectively blocking impurities in the asphalt pavement recycled material on the surface of the belt conveyor.

[0062] The drive mechanism of this grate sorting machine includes a motor 25, which is fixed to the frame 17 via a motor mount 37. The motor 25 is connected to a drive shaft 26 via a coupling. This drive shaft 26 is connected to a gear 27 that meshes with a rack plate 22. The motor 25 drives the gear 27 to rotate, thereby causing the rack plate 22 to slide left and right. Figure 6 As shown, the left and right sliding of the grate mechanism is achieved, ultimately enabling the grate mechanism to transport the impurities blocked on the grate bars 18 out of the belt conveyor. Correspondingly, the two sets of grate mechanisms are located on both sides of the drive mechanism, and the two sets of grate mechanisms are arranged left and right on both sides. The rack plate 22 meshes with the gear 27, so that the rotation of the gear 27 drives the relative movement of the grate mechanisms on both sides.

[0063] like Figure 7 As shown, the scraper mechanism includes a scraper 21, a support plate 31 located at the lower end of the scraper 21 and supporting it, and a drive assembly that drives the scraper 21 to move up and down and back and forth. Through the up-and-down and back-and-forth movement of the scraper 21, impurities carried on the grate bars 18 can be effectively scraped off, and the scraped impurities fall into the U-shaped recovery bin 36 located at the lower end of the scraper mechanism. The drive assembly includes a first bracket 32 ​​fixedly mounted on the frame 17, on which a transverse cylinder 33 is mounted, and a movable bracket 34 is connected to the telescopic section of the cylinder 33. The movable bracket 34, the support plate 31, and the scraper 21 are connected by a guide shaft 24, which is located at both ends of the scraper 21. A sliding block 23 is provided at the connection between the guide shaft 24 and the movable bracket 34, and a vertical cylinder 33 and a second bracket 35 are provided between the movable bracket 34 and the scraper 21. The second bracket 35 is fixed on the movable bracket 34, and the telescopic end of the cylinder 33 is connected to the scraper 21. The movable bracket 34 is driven to move back and forth by the horizontal cylinder 33, and the scraper 21 is moved up and down by the vertical cylinder 33, the guide shaft 24 and the sliding block 23.

[0064] In order to effectively remove impurities from the grate bars 18, the sum of the lengths of the scraper 21 of the scraper mechanisms at both ends of the present invention should be greater than or equal to the length of the several rows of grate bars that span the belt conveyor.

[0065] In addition to the above, the grate sorting machine of the present invention also includes sensors located at both ends of the frame 17. Through the setting of these sensors, when the grate bars 18 reach the end position of the frame 17, the sensors feed back to the PLC control system, the drive mechanism stops running, and the scraper mechanism starts running. When the scraper mechanism finishes one up-and-down movement, the PLC control system then controls the drive mechanism to run in the reverse direction. The sensor settings, sensor monitoring and feedback, and PLC control system operation methods of this invention are well-known technologies in the art.

[0066] The present invention uses the above-mentioned grate sorting machine for sorting, comprising the following steps:

[0067] Step 1: Start the drive mechanism, drive the sliding mechanism to move the grate bars to slide left or right. The grate bars at the lower end of the guide rail plate, which is consistent with the transmission section of the return conveyor belt, block impurities in the asphalt road recycled material on the return conveyor belt and slide left or right with it.

[0068] Step 2: When the grate bars of the grate bar mechanism reach the position of the scraper mechanism, the scraper mechanism is driven by the drive component to scrape off the impurities on the grate bars;

[0069] Step 3: Start the drive mechanism to drive the sliding mechanism to move the grate bar to the right or left. Repeat Step 1 and Step 2 above to carry out the sorting operation.

[0070] Specifically:

[0071] Step 1: Set the grate sorter across the return conveyor belt and adjust its position so that the lower ends of the grate bars of the grate bar mechanism on both sides are kept 5mm away from the surface of the return conveyor belt.

[0072] Step 2: Start the drive assembly to make the grate mechanism slide left or right. The grate located at the top of the return conveyor belt can block and carry away impurities in the asphalt road recycled material running on the return conveyor belt, allowing it to slide left or right together.

[0073] Step 3: When the grate bar at one end enters the scraper mechanism position and reaches the end of the frame, the sensor on the frame feeds back to the PLC control system, which then controls the drive mechanism to stop running and starts the scraper mechanism to adhere to the grate bar for cleaning. When the scraper mechanism finishes one up-and-down movement, the PLC control system controls the drive mechanism to run in the opposite direction.

[0074] Step 4: Similarly, when the grate bars slide to the other end, repeat the same steps as in Step 3.

[0075] Step 5: The grate mechanism moves back and forth until the asphalt road recycling material on the return conveyor belt is sorted.

[0076] This invention employs the screening method of the aforementioned fine separation and recycling system for asphalt pavement recycled materials, such as... Figure 8 As shown, it includes the following steps:

[0077] Step 1: The asphalt pavement recycled material is conveyed to the non-blocking screen for initial screening by the elevator. The recycled material with a particle size of less than 25mm obtained after the initial screening enters the separator to crush and remove the asphalt film. The recycled material separated by the separator enters the anti-sticking fine screen for fine screening to obtain fine materials of 0-3mm, 3-5mm, 5-10mm and 10-15mm (or 10-20mm). The recycled material with a particle size of 15mm or 20mm or larger that is left over from the screening is then conveyed to the non-blocking screen for screening by the grate sorter.

[0078] Step 1: Strip-shaped impurities and recycled materials with a particle size of 25mm or more that have not been screened by the unobstructed screen are fed into the pelletizer for crushing, and then the strip-shaped impurities are removed by the grate sorter. The sorted recycled materials are then conveyed to the unobstructed screen by the belt conveyor and the elevator for repeated screening.

[0079] Step 3: Repeat steps 1 and 2 until the screening operation is completed.

[0080] Example 1

[0081] The method for fine separation using the separation and regeneration system of the present invention includes the following steps:

[0082] Step 1, System Parameters: Standard atmospheric pressure 760 mmHg; Altitude ≤ 1000 m; Ambient temperature -5℃ to 30℃; Aggregate specific gravity 1600 kg / m³ 3 Maximum feed rate: 120t / h; Maximum feed particle size: 200mm; Screen residue rate: ≤1%; Moisture content of recycled material: ≤5%; Finished material: 0-3mm, 3-5mm, 5-10mm, 10-15mm (or 10-20mm).

[0083] Step 2: Unload the asphalt pavement recycled material to be separated and screened onto the raw material feeder;

[0084] Step 3: The raw material feeder drives the belt conveyor to feed the material to the elevator according to the preset output using frequency conversion speed regulation;

[0085] Step 4: The elevator feeds the recycled asphalt pavement material into the unobstructed screen along the chute for pre-screening;

[0086] Step 5: The non-blocking screen conveys the recycled material with a particle size greater than 25mm along the chute to the particle crusher. After crushing, it is conveyed along the belt and passes through the grate sorter to remove irregular strip-shaped impurities such as non-woven fabric and anti-crack tape from the recycled asphalt pavement material before returning to the elevator. The recycled material with a particle size less than 25mm enters the separator along the chute for crushing and separation.

[0087] Step 6: The recycled material after crushing and separation will enter the anti-sticking fine screen along the chute. During the vibration process, the elastic polyurethane screen plate of the anti-sticking fine screen will repeatedly perform tension and relaxation movements at a high frequency to throw the recycled material. This can not only effectively prevent the wet recycled material from sticking to the screen plate, but also prevent fine recycled material from clogging the screen holes, thus significantly improving the screening efficiency.

[0088] Step 7: Finally, the 0-3mm, 3-5mm, 5-10mm, and 10-15mm (or 10-20mm) recycled materials are separated by an anti-sticking fine screen and transported to the storage silo by a belt drive. The recycled materials larger than 15mm or 20mm are returned to the elevator for secondary separation along the belt conveyor.

[0089] Step 8: Repeat steps 4 through 7 above until the screening operation is completed.

Claims

1. An asphalt pavement recycling system for fine separation and regeneration of reclaimed asphalt pavement, comprising: The separation and regeneration system comprises a feeding device (1), a screening device (2) for primary screening of asphalt pavement recycling materials, a cutting device (3) and a separation device (4) connected with the screening device (2) respectively; The material meeting the particle size requirement after screening by the screening device (2) enters the separation device (4) which is connected with a fine screening device (5), and the fine material meeting the particle size requirement is obtained after screening. The strip-shaped impurities and recycling materials not screened by the screening device (2) enter the cutting device (3) for crushing, the cutting device (3) is connected with a grating sorting machine (6) to automatically remove the strip-shaped impurities, and the recycling materials after sorting by the grating sorting machine (6) are conveyed to the screening device (2) by the feeding device (1) for screening until the fine material meeting the particle size requirement is obtained. The grating sorting machine (6) comprises a rack (17), a grating mechanism arranged on the rack (17), and a scraper mechanism arranged outside both ends of the grating mechanism; the grating mechanism is used for blocking and conveying impurities in the asphalt pavement recycling materials running on the conveying device (9); the grating mechanism comprises a plurality of grating bars (18) arranged in sequence from left to right, a sliding mechanism for fixing and enabling the grating bars (18) to slide left and right, the sliding mechanism comprises a guide rail plate (19) arranged on the rack (17) and having the same transmission section as the conveying device (9), the upper ends of the grating bars (18) are connected to the lower ends of the guide rail plate (19) through a guide wheel mechanism, the lower ends of the grating bars (18) are connected to a sliding guide rail, a return spring (20) is arranged on the grating bar (18) segment between the sliding guide rail and the guide rail plate (19) to enable the grating bar (18) to move up and down; the scraper mechanism is used for scraping the blocked impurities on the grating bar (18); the scraper mechanism comprises a scraper (21) and a driving assembly for driving the scraper (21) to move forward and backward and up and down.

2. The asphalt pavement recycling system of claim 1, wherein: The cutting device (3) and the separation device (4) are located at the lower end of the screening device (2) and are connected through chutes; the fine screening device (5) is located at the lower end of the separation device (4) and is connected through a chute.

3. The asphalt pavement recycling system of claim 1, wherein: The feeding device (1) is a hoist, one end of the hoist is connected with a feeding device (7), and the other end is connected with the screening device (2).

4. The asphalt pavement recycling system of claim 1, wherein: The separation and regeneration system further comprises a support frame (8) for supporting each device.

5. The asphalt pavement recycling system of claim 1, wherein: The cutting device (3) is connected with the feeding device (1) through a conveying device (9), and the grating sorting machine (6) is arranged across the conveying device (9) to automatically remove the impurities in the asphalt pavement recycling materials.

6. The asphalt pavement recycling system of claim 1, wherein: The separation and regeneration system further comprises a dust removal device (10) connected with the screening device (2), the cutting device (3), the separation device (4), and the fine screening device (5).

7. The asphalt pavement recycling fine separation and regeneration system according to claim 1, characterized in that: The screening device (2) screens the recycled material to obtain a size of less than 25 mm into the separating device (4), and the recycled material with a size of more than 25 mm and strip impurities into the granulating device (3); the fine screening device (5) screens to obtain fine material with a size of 0-3 mm, 3-5 mm, 5-10 mm and 10-15 mm or 10-20 mm, and the bottom end of the fine screening device (5) is respectively provided with a conveying device (9) connected with the storage bin (11) with a size of 0-3 mm, 3-5 mm, 5-10 mm and 10-15 mm or 10-20 mm.

8. The asphalt pavement recycling system of claim 7, wherein: The discharge port of the recycling bin of the dust removal device (10) is connected with the 0-3 mm recycled material discharge conveying device (9) through the spiral conveying device (12).

9. The method of separating using the fine separation and regeneration system of reclaimed asphalt pavement according to claim 1, characterized in that The method comprises the following steps: Step one, the asphalt pavement recycled material is conveyed to the screening device (2) by the feeding device (1) for primary screening, and the material meeting the particle size requirement is obtained after primary screening and enters the separating device (4) to remove the asphalt film, the recycled material after separation by the separating device (4) enters the fine screening device (5) for fine screening to obtain fine material meeting the particle size requirement, and the recycled material screened by the fine screening device (5) is conveyed to the screening device (2) again after being sorted by the grating sorting machine for screening again; Step two, the strip impurities and recycled material after not being screened by the screening device (2) enter the granulating device (3) for crushing, and the strip impurities are removed by the grating sorting machine (6), and the sorted recycled material is conveyed to the screening device (2) by the feeding device (1) for re-screening; Step three, steps one and two are repeated until the screening operation is completed.

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