Concrete waste recycling aggregate screening and cleaning device

Abstract

This invention belongs to the field of recycled aggregate treatment technology for construction waste concrete, and discloses a screening and cleaning device for recycled aggregate from concrete waste. The device includes a cylinder with a feed cylinder at the top and a first and second discharge port on the side wall. A partition plate is fixed inside the cylinder, dividing it into an upper screening and cleaning chamber and a lower assembly chamber. The screening and cleaning chamber contains a surrounding cover assembly and a screening assembly. The screening assembly includes a connecting shaft movably passing through the partition plate and a primary screening disc fixed to the connecting shaft and located above it. This invention is suitable for screening and cleaning concrete waste particles after pre-crushing and removal of large-sized reinforcing bars and long debris. By nesting the primary and secondary screening chambers within the same cylinder and driving the vibrating screen using the same drive assembly, different particle sizes of recycled aggregate particles can be graded, screened, and cleaned within a single device, improving the integrated efficiency of recycled aggregate treatment.

Description

Technical Field

[0001] This invention belongs to the field of recycled aggregate treatment technology for construction waste concrete, and specifically relates to a screening and cleaning device for recycled aggregate from concrete waste. Background Technology

[0002] A large amount of concrete waste is generated during building construction, demolition, renovation, and waste disposal. After pre-crushing and removal of large-sized steel bars, wood, plastics, and other debris, the concrete waste can be formed into granular materials of different sizes. Before reuse, these materials usually need to be screened and washed to remove residual mortar powder, dust, and excessively fine particles adhering to their surface, thereby forming recycled aggregates that meet different usage requirements.

[0003] Currently, most screening and cleaning devices in the recycled aggregate processing field use a combination of a single-stage vibrating screen and a flushing water pipe to screen and clean pre-treated concrete waste particles, collecting the oversize and undersize particles separately. These devices have the following problems in practical use: First, single-stage screening can only separate materials into two categories based on a single particle size boundary. For applications requiring simultaneous acquisition of coarse and fine recycled aggregate particles, two independent screening devices are often needed for step-by-step processing, resulting in large equipment footprints and cumbersome process connections. Second, after screening, particles accumulated above the screen slide off naturally due to gravity during unloading, leading to slow unloading, significant residue on the screen, low emptying efficiency, and impacting the continuity of the next feeding cycle. Third, wastewater generated from vibrating screening and water spraying is usually mixed with fine particles and residual mortar powder, requiring subsequent sedimentation and separation, a complex process. Fourth, screened particles are usually directly piled or transported, resulting in high moisture content. In some reuse scenarios with moisture content requirements, an additional dewatering process is needed. The aforementioned problems limit the overall processing efficiency of the recycled aggregate screening and cleaning device under continuous production conditions. Summary of the Invention

[0004] The purpose of this invention is to provide a screening and cleaning device for recycled aggregates from concrete waste, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a screening and washing device for recycled aggregates from concrete waste, comprising a cylinder, wherein a feed cylinder is provided at the top of the cylinder, and a first discharge port and a second discharge port are provided on the side wall of the cylinder.

[0006] A partition plate is fixed inside the cylinder, which divides the cylinder into an upper screening and cleaning chamber and a lower assembly chamber.

[0007] The screening and cleaning chamber is equipped with a surrounding cover assembly and a screening assembly. The screening assembly includes a connecting shaft that is movably inserted through the partition plate, a primary screen plate fixed on the connecting shaft and located above it, a guide plate fixed on the connecting shaft and located below the primary screen plate, an inner cylinder fixed below the primary screen plate, an outer cylinder fixed to the bottom outer periphery of the primary screen plate, an annular guide cover connected to the bottom of the outer cylinder, a flexible secondary screen cover connected to the bottom of the inner cylinder, a first magnetic ring fixed to the bottom of the flexible secondary screen cover, and an elastic connecting assembly connecting the first magnetic ring and the inner cylinder.

[0008] The assembly cavity is equipped with a drive assembly that is connected to the connecting shaft. Above the isolation plate is a second magnetic ring that corresponds vertically to the first magnetic ring. The connecting shaft can move between a first position and a second position. In the first position, the primary screen plate and the surrounding cover assembly form a primary screening chamber, and the flexible secondary screen cover, the inner cylinder, the primary screen plate, and the guide plate form a secondary screening chamber. In the second position, the first magnetic ring is displaced relative to the inner cylinder by the elastic connecting assembly under the magnetic repulsion of the second magnetic ring, so as to deform the flexible secondary screen cover and open the bottom of the secondary screening chamber.

[0009] Preferably, the enclosure assembly includes an annular cover and a transition ring fixed to the top of the annular cover. A stepped annular cavity is formed in the top wall of the inner cylinder. The transition ring is rotatably sleeved in the stepped annular cavity. A first spring is provided in the stepped annular cavity above the transition ring.

[0010] Preferably, the top outer edge of the primary sieve disc is provided with a guiding arc surface, and the bottom end of the annular cover is provided with a mating surface that cooperates with the guiding arc surface.

[0011] Preferably, the drive assembly includes a drive motor and a drive shaft fixedly connected to the output end of the drive motor. The bottom of the drive shaft is provided with a sleeve cavity, the inner wall of the sleeve cavity is provided with an axially extending slot, the outer side of the drive shaft is provided with a locking block that slides with the slot, the drive shaft is slidably sleeved in the sleeve cavity, and a return spring is provided between the top of the drive shaft and the sleeve cavity.

[0012] Preferably, the drive assembly further includes a connecting ring fixed to the outside of the connecting shaft, a rotating disk rotatably sleeved on the outer periphery of the connecting ring, an electric push rod located below the rotating disk, an annular support disk fixed to the movable end of the electric push rod, an auxiliary motor mounted on the annular support disk, and a cam fixed to the output end of the auxiliary motor. The annular support disk abuts against the rotating disk, and the cam abuts against the lower surface of the rotating disk.

[0013] Preferably, it further includes a top ring and a support rod, the support rod being fixed to the isolation plate and located outside the connecting shaft, the top ring being fixed to the top of the support rod, and the second magnetic ring being fixed to the top ring and coaxially corresponding to the first magnetic ring.

[0014] Preferably, the elastic connection assembly includes a side ring fixed to the outer wall of the inner cylinder, a connecting arm fixed to the outer wall of the first magnetic ring, and a second spring connecting the side ring and the connecting arm. The upper end of the connecting arm moves through the side ring, and a connecting block located above the side ring is fixedly provided on the upper end of the connecting arm.

[0015] Preferably, the top of the guide plate is provided with an upwardly raised frustum-shaped arc surface, and the top of the partition plate is provided with a guide slope extending obliquely toward the second discharge port.

[0016] Preferably, the first discharge port is correspondingly provided with the annular guide cover, and the second discharge port is located above the outer edge of the isolation plate; the top of the annular guide cover is provided with circumferentially distributed protruding ribs, and the outer peripheral edge of the annular guide cover is provided with an elastic ring.

[0017] Preferably, it also includes a cleaning mechanism, which includes a cleaning pipe passing through the top of the cylinder and extending into the interior of the enclosure assembly, and a cleaning nozzle located at the bottom of the cleaning pipe, the cleaning nozzle being positioned toward the primary screening chamber.

[0018] The beneficial effects of this invention are as follows:

[0019] 1. This invention overcomes the problems of existing devices that require two independent sets of equipment for single-stage screening and cumbersome material transfer, by nesting the primary screening chamber and the secondary screening chamber in the same cylinder and driving the vibrating screening by the same drive component. It realizes the synchronous grading, screening and cleaning of pre-treated concrete waste particles in one device, which can obtain recycled aggregate particles of different sizes and improve the integrated efficiency of recycled aggregate processing.

[0020] 2. This invention uses the downward movement of the connecting shaft to simultaneously trigger the rotational centrifugal unloading and the magnetic repulsion to open the bottom of the secondary screening chamber for material release. This overcomes the problems of slow unloading and excessive material residue caused by the reliance on gravity for natural unloading in existing devices. It achieves rapid directional clearing of particles from the two-stage screening process, and the recycled aggregate screening and cleaning device can be continuously put into the next round of screening operations.

[0021] 3. This invention overcomes the problems of existing devices where wastewater and fine particles are mixed and discharged, and the particles have high moisture content, requiring additional post-treatment processes. It achieves sequential integration of cleaning, wastewater separation, and dewatering within the same recycled aggregate screening and cleaning device, enabling recycled aggregate particles to be produced with lower moisture content after screening and cleaning. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a cross-sectional view of the present invention;

[0024] Figure 3 This is a cross-sectional view of the cylinder and cleaning mechanism of the present invention;

[0025] Figure 4 This is a schematic diagram showing the cooperation between the enclosure assembly and the screening assembly of the present invention;

[0026] Figure 5 This is a cross-sectional view of the screening component and the driving component of the present invention;

[0027] Figure 6 This is a schematic diagram of the elastic connection mechanism of the present invention;

[0028] Figure 7 This is an exploded view of the connecting shaft and the drive shaft of the present invention;

[0029] Figure 8 This is a schematic diagram of the driving component of the present invention;

[0030] Figure 9 This is a schematic diagram showing the connection between the second magnetic ring and the top ring of the present invention.

[0031] In the diagram: 1. Cylinder; 2. Feed cylinder; 3. First discharge port; 4. Second discharge port; 5. Isolation plate; 6. Enclosure assembly; 601. Annular cover; 602. Adapter ring; 603. Stepped annular cavity; 604. First spring; 7. Screening assembly; 701. Connecting shaft; 702. Primary screen plate; 703. Guide plate; 704. Inner cylinder; 705. Outer cylinder; 706. Annular guide cover; 707. Flexible secondary screen cover; 708. First magnetic ring; 709. Elastic connecting assembly; 7091. Side ring; 7092. 7093. Connecting arm; 7094. Second spring; 7095. Connecting block; 8. Drive assembly; 801. Drive motor; 802. Drive shaft; 803. Sleeve cavity; 804. Return spring; 805. Connecting ring; 806. Rotating disk; 807. Electric push rod; 808. Annular support disk; 809. Auxiliary motor; 9. Second magnetic ring; 10. Slot; 11. Slot block; 12. Top ring; 13. Support rod; 14. Protruding rib; 15. Cleaning mechanism; 1501. Cleaning pipe; 1502. Cleaning nozzle; 16. Cam. Detailed Implementation

[0032] Implementation Method 1

[0033] The cylinder 1 is a vertically arranged hollow shell. The feed cylinder 2 is located in the middle of the top wall of the cylinder 1. The first discharge port 3 is located in the lower middle part of the side wall of the cylinder 1, and the second discharge port 4 is located in the side wall of the cylinder 1 and above the outer periphery of the partition plate 5. In this embodiment, the material entering the device through the feed cylinder 2 is concrete waste particles that have been pre-crushed and have had large-sized steel bars, wood, and long strips or flakes of plastic debris removed. These particles are then screened and washed to form recycled aggregates of different particle sizes. The second discharge port 4 is used to receive the liquid guided and discharged by the guide slope at the top of the partition plate 5, and to receive particles moving along the guide slope when smaller-sized recycled aggregate particles are released, thus serving as a common outlet for the time-sharing discharge of liquid and smaller-sized recycled aggregate particles. The isolation plate 5 is fixedly connected to the inner wall of the cylinder 1. A through hole is formed in the middle of the isolation plate 5 for the connecting shaft 701 to pass through. A guide sleeve (not shown in the figure) is installed in the through hole and fixed on the isolation plate 5. A fitting clearance is formed between the inner hole of the guide sleeve and the outer circumference of the connecting shaft 701 for the lifting and rotation of the connecting shaft 701. A sealing ring (not shown in the figure) is provided at the upper or lower end of the guide sleeve. An annular liquid-retaining step is formed at the part of the isolation plate 5 located on the outer circumference of the through hole. Liquid and fine particles falling in the screening and cleaning chamber flow back to the upper surface of the isolation plate 5 through the liquid-retaining step and do not enter the lower assembly chamber. The isolation plate 5 divides the cylinder 1 into an upper screening and cleaning chamber and a lower assembly chamber. The upper space is used to receive feed, primary screening, secondary screening and liquid spraying and rinsing processes, and the lower space is used to arrange the drive assembly 8 and magnetic drive components.

[0034] The enclosure assembly 6 is arranged in the upper part of the screening and cleaning chamber. The annular cover 601 is located directly below the feed cylinder 2, and the adapter ring 602 is fixed to the top of the annular cover 601. A stepped annular cavity 603 is opened in the inner top wall of the cylinder 1, and the adapter ring 602 is rotatably sleeved in the stepped annular cavity 603. The first spring 604 is located above the adapter ring 602 and is in contact with the top surface of the stepped annular cavity 603. The adapter ring 602 is kept in a limited state in the axial direction, while retaining the circumferential rotational freedom. When the connecting shaft 701 drives the primary screen plate 702 to vibrate slightly up and down, and the primary screen plate 702 abuts against the annular cover 601, the first spring 604 is compressed and provides axial elastic relief space, so that the enclosure assembly 6 can keep in close contact with the screening assembly 7 and vibrate synchronously, thereby avoiding structural jamming or damage caused by rigid pushing. The lower end of the annular cover 601 forms a continuous annular edge, and the outer edge of the top of the primary screen plate 702 forms an upward transitional guide arc surface. After the connecting shaft 701 rises to the upper working position, the guide arc surface and the annular edge form a circumferential contact area, and the outer peripheral boundary of the primary screening chamber closes at this position. The annular edge can be a smooth metal edge, or a wear-resistant ring or an elastic contact edge can be provided on its inner side. When the primary screen plate 702 rotates to discharge material, the annular cover 601 can circumferentially conform to the contact direction, and maintain a circumferential contact state when the primary screen plate 702 moves upward and closes.

[0035] The screening component 7 is located below the enclosure component 6 and moves integrally with the connecting shaft 701. The connecting shaft 701 is arranged along the axis of the cylinder 1. The primary screen disc 702 is fixed on the upper part of the connecting shaft 701, and the guide disc 703 is fixed on the connecting shaft 701 and located below the primary screen disc 702. The central area of ​​the guide disc 703 is fixedly connected to the connecting shaft 701, and its outer periphery is within the enclosure of the flexible secondary screen cover 707. The primary screen disc 702 constitutes the primary screening surface, and primary screen holes are opened on the disc body to intercept larger-diameter recycled aggregate particles. The flexible secondary screen cover 707 constitutes the secondary screening surface, and the mesh size is smaller than the primary screen hole size to intercept smaller-diameter recycled aggregate particles. The inner cylinder 704 is fixed to the bottom center of the primary screen plate 702, and the outer cylinder 705 is fixed to the outer periphery of the bottom of the primary screen plate 702. The inner cylinder 704 and the outer cylinder 705 are arranged coaxially along the connecting shaft 701. The annular guide cover 706 is fixed to the bottom of the outer cylinder 705 and located outside the flexible secondary screen cover 707. The top of the guide plate 703 forms an upwardly raised frustum arc surface, and the outer periphery of the frustum arc surface transitions towards the inner side of the flexible secondary screen cover 707. The top of the partition plate 5 forms a guide slope extending inclined towards the second discharge port 4, and the lower end of the guide slope is connected to the area where the second discharge port 4 is located.

[0036] The upper end of the flexible secondary screen cover 707 is fixed to the inner cylinder 704, and the lower end is fixed to the first magnetic ring 708. An axial elastic constraint is established between the first magnetic ring 708 and the inner cylinder 704 through an elastic connecting assembly 709. A side ring 7091 is fixed to the outer wall of the inner cylinder 704. Multiple connecting arms 7092 are circumferentially spaced and fixed to the outer wall of the first magnetic ring 708, passing upwards through the side ring 7091. A connecting block 7094 is fixed to the upper end of each connecting arm 7092. A second spring 7093 is disposed between the side ring 7091 and the connecting block 7094. The first magnetic ring 708 can move axially relative to the inner cylinder 704. During movement, the connecting arms 7092 guide the direction of movement of the first magnetic ring 708, and the second spring 7093 provides elastic constraint when the first magnetic ring 708 returns to its initial position. When the flexible secondary screen cover 707 is in an enclosed state, a continuous annular lower boundary is formed between its lower end and the outer edge of the guide plate 703. Because the flexible secondary screen cover 707 itself is an elastic material with inward contraction characteristics (or its mesh structure naturally wrinkles and recedes inward due to its own structural characteristics after losing axial tensile tension), when the first magnetic ring 708 moves upward along the connecting shaft 701, the lower part of the flexible secondary screen cover 707 deforms inward accordingly, exposing an annular release area between the outer edge of the guide plate 703 and the lower end of the flexible secondary screen cover 707. The flexible secondary screen cover 707 can be made of polyurethane elastic screen, rubber-based flexible screen, or stainless steel woven screen with an elastic outer layer. The first magnetic ring 708 and the second magnetic ring 9 adopt a permanent magnet structure, with an outer circumference covered by a stainless steel sleeve or a polymer wear-resistant sleeve.

[0037] Implementation Method 2

[0038] The drive assembly 8 simultaneously drives the rotation and lifting vibration of the connecting shaft 701. The drive motor 801 is fixed to the bottom or side of the assembly cavity, and the drive shaft 802 is fixedly connected to the output end of the drive motor 801. A socket cavity 803 is formed at the bottom of the connecting shaft 701. The drive shaft 802 is inserted into the socket cavity 803, and a slot 10 is formed on the inner wall of the socket cavity 803. A locking block 11 is fixed to the outside of the drive shaft 802 and slidably engages within the slot 10. When the drive shaft 802 drives the connecting shaft 701 to rotate, the locking block 11 moves along the length of the slot 10, allowing the connecting shaft 701 to complete lifting displacement while maintaining rotational transmission. A return spring 804 is connected between the top of the drive shaft 802 and the top wall of the socket cavity 803. After the connecting shaft 701 descends, the return spring 804 is in an axial elastic state. During the upward movement of the connecting shaft 701, the return spring 804 releases its elastic stroke. The drive motor 801, electric push rod 807 and auxiliary motor 809 are all located below the isolation plate 5, which separates the screening and cleaning conditions from the driving conditions.

[0039] A connecting ring 805 is fixed to the outside of the connecting shaft 701, and a rotating disk 806 is rotatably sleeved on the outer circumference of the connecting ring 805. An electric push rod 807 is positioned below the rotating disk 806, and an annular support disk 808 is fixed to the movable end of the electric push rod 807. An auxiliary motor 809 is mounted on the annular support disk 808, and a cam 16 is fixed to the output end of the auxiliary motor 809. The upper surface of the annular support disk 808 abuts against the lower surface of the rotating disk 806. When the electric push rod 807 extends, the annular support disk 808 moves upward as a whole, supporting the rotating disk 806. The rotating disk 806 drives the connecting shaft 701 to move upward via the connecting ring 805. When the auxiliary motor 809 drives the cam 16 to rotate, the outer contour of the cam 16 periodically presses against the lower surface of the rotating disk 806, causing the connecting shaft 701 to reciprocate slightly near its upper position. The connecting shaft 701, primary screen plate 702, guide plate 703, inner cylinder 704, outer cylinder 705, annular guide cover 706, and flexible secondary screen cover 707 operate synchronously during this process.

[0040] The top ring 12 is fixed above the isolation plate 5 by three or more support rods 13, with each support rod 13 spaced apart along the outer circumference of the connecting shaft 701. The top ring 12 and the connecting shaft 701 are coaxial. The second magnetic ring 9 is fixed to the lower side of the top ring 12 and is coaxial with the first magnetic ring 708. The first magnetic ring 708 and the second magnetic ring 9 are arranged with their poles facing each other. When the connecting shaft 701 is in the upper working position, a non-contact gap is maintained between the first magnetic ring 708 and the second magnetic ring 9. After the connecting shaft 701 moves down to the material release position, the two magnetic rings enter the magnetic repulsion zone. Under the guidance of the connecting arm 7092, the first magnetic ring 708 moves axially upward relative to the inner cylinder 704. The second spring 7093 is under force. After the connecting shaft 701 moves upward again, the first magnetic ring 708 leaves the magnetic repulsion zone, and the second spring 7093 drives the first magnetic ring 708 back to its initial position. Throughout its entire movement, the first magnetic ring 708 remains within the axial range defined by the connecting arm 7092 and the side ring 7091, and does not experience rigid collisions with the inner cylinder 704, the guide plate 703, or the top ring 12.

[0041] Implementation Method 3

[0042] The annular guide cover 706 has multiple raised ribs 14 on its top, which are arranged at intervals along the circumference. An elastic ring is provided on the outer periphery of the annular guide cover 706. When the annular guide cover 706 rotates synchronously with the connecting shaft 701, the raised ribs 14 drive the particles to move along the surface of the annular guide cover 706. The elastic ring is located at the outer edge of the annular guide cover 706 and rotates with it. The first discharge port 3 is located in the corresponding area on the outer periphery of the annular guide cover 706. Larger-diameter recycled aggregate particles released after primary screening fall onto the annular guide cover 706 through the outer edge of the primary screen 702, and then move along the surface of the annular guide cover 706 to the area of ​​the first discharge port 3 for discharge. The annular guide cover 706, guide disc 703, inner cylinder 704, outer cylinder 705, isolation plate 5, and annular cover 601 can be constructed using wear-resistant steel plate, stainless steel plate, or carbon steel plate with a wear-resistant layer on the outer surface. The raised rib 14 and the annular guide cover 706 can be integrally formed, or fixed by welding or screwing. The elastic ring can be made of polyurethane or rubber.

[0043] The cleaning mechanism 15 is installed at the top of the cylinder 1. The cleaning pipe 1501 is fixedly passed through the top wall of the cylinder 1 and extends into the annular cover 601. The cleaning nozzle 1502 is installed at the bottom of the cleaning pipe 1501, and the spray direction is towards the area above the primary screen 702. The cleaning nozzle 1502 can be a single nozzle structure or an annular multi-hole structure, and the spray coverage area is located inside the primary screening chamber. In the secondary screening stage, the fine material and liquid passing through the primary screen 702 enter the secondary screening chamber. Among them, the liquid, as well as fine particles with a particle size smaller than the mesh of the flexible secondary screen cover 707, residual mortar powder, and sewage, are first discharged through the flexible secondary screen cover 707 and fall to the top of the isolation plate 5. Then, guided by the guide slope, it flows to and is discharged through the second discharge port 4. In this stage, the second discharge port 4 is used as a sewage discharge port. The cleaning pipe 1501 is connected to the top wall of the cylinder 1 by thread, flange or welding. A sealing gasket is installed at the connection to prevent liquid from leaking out from the connection part of the top wall during the spraying operation.

[0044] Implementation Method 4

[0045] The primary sieve disc 702 can be a metal sieve plate structure with sieve holes evenly distributed on the disc body; or it can be a partitioned sieve hole structure with denser sieve holes on the outer periphery and sparser sieve holes in the center. The mesh size of the flexible secondary sieve cover 707 is smaller than that of the primary sieve disc 702, and the sieve particle sizes of the primary sieve disc 702 and the flexible secondary sieve cover 707 form a front-to-back gradation relationship. The minimum enclosing distance between the outer edge of the guide disc 703 and the lower end of the flexible secondary sieve cover 707 is less than the conventional passing size of the secondary sieved particles. When the connecting shaft 701 is in the upper working position, the bottom of the secondary sieve chamber remains enclosed; when the connecting shaft 701 is in the lower release position and the first magnetic ring 708 moves upward, a continuous annular opening is formed between the outer edge of the guide disc 703 and the lower end of the flexible secondary sieve cover 707. The upper and lower screening spaces, enclosed by the annular cover 601, the primary screening disc 702, the inner cylinder 704, the outer cylinder 705, and the guide disc 703, are arranged along the same central axis. Concrete waste particles complete the primary screening, secondary screening, washing, and release processes within the coaxial path.

[0046] Working principle

[0047] When the equipment is in standby mode, the connecting shaft 701 is in the lower position, the primary screen plate 702 is separated from the annular cover 601, the first magnetic ring 708 is close to the second magnetic ring 9, and the lower part of the flexible secondary screen cover 707 is in the open state. After the electric push rod 807 extends, the annular support plate 808 lifts the rotating plate 806, the connecting shaft 701 moves upward along the axis, the guiding arc surface of the top outer edge of the primary screen plate 702 fits with the bottom annular edge of the annular cover 601, the primary screening chamber is formed, and the flexible secondary screen cover 707, the primary screen plate 702, and the guide plate 703 form the secondary screening chamber. The first magnetic ring 708 leaves the magnetic repulsion area of ​​the second magnetic ring 9, and the flexible secondary screen cover 707 returns to the enclosed state.

[0048] After pre-crushing and removal of large-sized steel bars, wood, plastics, and other debris, concrete waste particles enter the primary screening chamber through the feed cylinder 2 and fall onto the primary screen plate 702. The auxiliary motor 809 starts, and the cam 16 continuously presses against the lower surface of the rotating disk 806. The connecting shaft 701 reciprocates slightly near its upper position, causing the primary screen plate 702 and the flexible secondary screen cover 707 to vibrate synchronously. Small particles and liquid on the primary screen plate 702 pass through the primary screen holes and enter the lower area, while larger-diameter recycled aggregate particles remain on the upper surface of the primary screen plate 702. Particles entering the lower area continue to fall into the space enclosed by the flexible secondary screen cover 707. Particles larger than the mesh size remain inside the flexible secondary screen cover 707, while finer particles and liquid smaller than the mesh size pass through the flexible secondary screen cover 707 and fall to the top of the isolation plate 5.

[0049] During the cleaning process, the cleaning mechanism 15 sprays liquid into the primary screening chamber. After contacting the particles above the primary screen plate 702, the liquid flows downwards, passing through the primary screen plate 702 and entering the secondary screening chamber. The liquid, along with fine particles smaller than the mesh size of the flexible secondary screen cover 707, residual mortar powder, and wastewater, passes through the flexible secondary screen cover 707 and falls to the top of the isolation plate 5, flowing along the guide slope to the second discharge port 4 for discharge. At this time, the second discharge port 4 serves as the wastewater discharge outlet. During this process, the connecting shaft 701 remains in the upper position, and the lower part of the flexible secondary screen cover 707 remains enclosed.

[0050] When larger-diameter recycled aggregate particles are discharged, the electric push rod 807 retracts, the connecting shaft 701 moves downward as a whole, the primary screen disc 702 separates from the annular cover 601, and the outer periphery of the primary screening chamber opens. After the drive motor 801 starts, the drive shaft 802 drives the connecting shaft 701 to rotate via the locking block 11 and the locking groove 10. The primary screen disc 702, the outer cylinder 705, and the annular guide cover 706 rotate synchronously. The particles on the upper surface of the primary screen disc 702 move outward along the guide arc and fall onto the annular guide cover 706, and then move along the annular guide cover 706 towards the first discharge port 3.

[0051] When smaller-diameter recycled aggregate particles are discharged, the connecting shaft 701 remains in the lower position, the first magnetic ring 708 enters the magnetic repulsion zone of the second magnetic ring 9 and moves upward relative to the inner cylinder 704 along the axial direction, the lower part of the flexible secondary screen cover 707 retracts inward, and an annular release opening is formed between the outer edge of the guide plate 703 and the lower end of the flexible secondary screen cover 707. The particles in the secondary screening chamber fall to the top of the isolation plate 5 and move along the guide slope to the second discharge port 4 for discharge. At this time, the second discharge port 4 undertakes the function of discharging smaller-diameter recycled aggregate particles, so that the second discharge port 4 completes the shared discharge in the order of discharging sewage first and then discharging smaller-diameter recycled aggregate particles.

[0052] After one discharge cycle, the electric push rod 807 extends again, the connecting shaft 701 returns to the upper position, the primary screen plate 702 re-fits with the annular cover 601, the first magnetic ring 708 leaves the second magnetic ring 9, the flexible secondary screen cover 707 returns to the enclosed state, and the equipment enters the next round of feeding.

Claims

1. A screening and cleaning device for recycled aggregates from concrete waste, comprising a cylinder (1), wherein a feed cylinder (2) is provided at the top of the cylinder (1), and a first discharge port (3) and a second discharge port (4) are provided on the side wall of the cylinder (1), characterized in that: The cylinder (1) is fixed with a partition plate (5), which divides the cylinder (1) into an upper screening and cleaning chamber and a lower assembly chamber. The screening and cleaning chamber is provided with a surrounding cover assembly (6) and a screening assembly (7). The screening assembly (7) includes a connecting shaft (701) movably passing through the isolation plate (5), a primary screen plate (702) fixed on the connecting shaft (701) and located above it, a guide plate (703) fixed on the connecting shaft (701) and located below the primary screen plate (702), an inner cylinder (704) fixed below the primary screen plate (702), an outer cylinder (705) fixed to the outer periphery of the bottom of the primary screen plate (702), an annular guide cover (706) connected to the bottom of the outer cylinder (705), a flexible secondary screen cover (707) connected to the bottom of the inner cylinder (704), a first magnetic ring (708) fixed to the bottom of the flexible secondary screen cover (707), and an elastic connecting assembly (709) connecting the first magnetic ring (708) and the inner cylinder (704). The assembly cavity is provided with a drive assembly (8) that is connected to the connecting shaft (701) for transmission. Above the isolation plate (5) is a second magnetic ring (9) that corresponds to the first magnetic ring (708) vertically. The connecting shaft (701) can move between a first position and a second position. In the first position, the primary screen plate (702) and the surrounding cover assembly (6) form a primary screening cavity. The flexible secondary screen cover (707), the inner cylinder (704), the primary screen plate (702), and the guide plate (703) form a secondary screening cavity. In the second position, the first magnetic ring (708) is displaced relative to the inner cylinder (704) by the elastic connecting assembly (709) under the magnetic repulsion of the second magnetic ring (9), so as to drive the flexible secondary screen cover (707) to deform and open the bottom of the secondary screening cavity.

2. The concrete waste recycled aggregate screening and cleaning device according to claim 1, characterized in that: The enclosure assembly (6) includes an annular cover (601) and a transition ring (602) fixed to the top of the annular cover (601). A stepped annular cavity (603) is provided on the inner top wall of the cylinder (1). The transition ring (602) is rotatably sleeved in the stepped annular cavity (603). A first spring (604) is provided in the stepped annular cavity (603) above the transition ring (602).

3. The concrete waste recycled aggregate screening and cleaning device according to claim 2, characterized in that: The top outer edge of the primary sieve disc (702) is provided with a guide arc surface, and the bottom end of the annular cover (601) is provided with a mating surface that cooperates with the guide arc surface.

4. The concrete waste recycled aggregate screening and cleaning device according to claim 1, characterized in that: The drive assembly (8) includes a drive motor (801) and a drive shaft (802) fixedly connected to the output end of the drive motor (801). The bottom of the connecting shaft (701) is provided with a socket cavity (803). The inner wall of the socket cavity (803) is provided with an axially extending slot (10). The outer side of the drive shaft (802) is provided with a locking block (11) that slides with the slot (10). The drive shaft (802) is slidably sleeved in the socket cavity (803), and a return spring (804) is provided between the top of the drive shaft (802) and the socket cavity (803).

5. The concrete waste recycled aggregate screening and cleaning device according to claim 4, characterized in that: The drive assembly (8) further includes a connecting ring (805) fixed to the outside of the connecting shaft (701), a rotating disk (806) rotatably sleeved on the outer periphery of the connecting ring (805), an electric push rod (807) located below the rotating disk (806), an annular support disk (808) fixed to the movable end of the electric push rod (807), an auxiliary motor (809) mounted on the annular support disk (808), and a cam (16) fixed to the output end of the auxiliary motor (809). The annular support disk (808) abuts against the rotating disk (806), and the cam (16) abuts against the lower surface of the rotating disk (806).

6. The concrete waste recycled aggregate screening and cleaning device according to claim 1, characterized in that: It also includes a top ring (12) and a support rod (13). The support rod (13) is fixed on the isolation plate (5) and located outside the connecting shaft (701). The top ring (12) is fixed on the top of the support rod (13). The second magnetic ring (9) is fixed on the top ring (12) and is coaxially corresponding to the first magnetic ring (708).

7. The concrete waste recycled aggregate screening and cleaning device according to claim 1, characterized in that: The elastic connecting assembly (709) includes a side ring (7091) fixed to the outer wall of the inner cylinder (704), a connecting arm (7092) fixed to the outer wall of the first magnetic ring (708), and a second spring (7093) connecting the side ring (7091) and the connecting arm (7092). The upper end of the connecting arm (7092) moves through the side ring (7091), and the upper end of the connecting arm (7092) is fixedly provided with a connecting block (7094) located above the side ring (7091).

8. The concrete waste recycled aggregate screening and cleaning device according to claim 1, characterized in that: The top of the guide plate (703) is provided with an upwardly raised frustum arc surface, and the top of the isolation plate (5) is provided with a guide slope extending inclined toward the second discharge port (4).

9. The concrete waste recycled aggregate screening and cleaning device according to claim 1, characterized in that: The first discharge port (3) is correspondingly provided with the annular guide cover (706), and the second discharge port (4) is located above the outer edge of the isolation plate (5); the top of the annular guide cover (706) is provided with circumferentially distributed protruding ribs (14), and the outer peripheral edge of the annular guide cover (706) is provided with an elastic ring.

10. A concrete waste recycled aggregate screening and cleaning device according to claim 1, characterized in that: It also includes a cleaning mechanism (15), which includes a cleaning pipe (1501) passing through the top of the cylinder (1) and extending into the enclosure assembly (6) and a cleaning nozzle (1502) located at the bottom of the cleaning pipe (1501), the cleaning nozzle (1502) being positioned toward the primary screening chamber.

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