A multi-stage screening device for recycled aggregates from solid waste

Abstract

This utility model discloses a multi-stage screening device for recycled solid waste aggregates, including a housing, a fixing ring, and a spiral downward screening frame. The housing has an internal screening cavity, inside which is the fixing ring. The spiral downward screening frame is centrally located within the fixing ring, and a spiral flow channel is formed inside the spiral flow channel. The spiral flow channel contains, sequentially arranged, screening section one, screening section two, screening section three, and a discharge port at the end of the spiral flow channel. This utility model achieves multi-stage fine screening of aggregates by setting up multiple screening sections with progressively increasing screen apertures in each section. This design allows for effective separation of aggregates of different particle sizes in different screening sections, significantly improving screening accuracy and efficiency. The spiral downward screening frame design allows the aggregates to gradually move downwards along the spiral flow channel during screening, avoiding the problems of aggregate accumulation and clogging in traditional screening devices, further improving screening efficiency.

Description

Technical Field

[0001] This utility model relates to the field of solid waste screening technology, specifically a multi-stage screening device for recycled solid waste aggregate. Background Technology

[0002] In fields such as construction engineering and mining, the resource utilization of recycled aggregates from solid waste (such as construction waste, tailings, and industrial slag) has become an important way to achieve "green building materials" and "dual carbon goals." However, solid waste raw materials are complex in composition, with uneven particle size distribution (containing fine particles, medium-sized aggregates, and large impurities), and often contain impurities such as iron components and wood blocks, leading to many technical bottlenecks in the processing of traditional screening equipment.

[0003] Traditional solid waste screening devices often employ single-stage or simple multi-stage screen structures with fixed and uniformly distributed screen apertures, making it difficult to achieve fine separation of aggregates of different particle sizes. For example, concrete blocks, mortar particles, and dust in construction waste are often discharged mixed together due to insufficient screen layers, resulting in low purity of recycled aggregates that cannot meet the particle size requirements of high-end building materials (such as recycled concrete and paving bricks). Furthermore, linear screening paths easily lead to material accumulation, especially when the solid waste has a high moisture content, where fine particles easily clog the screen apertures, significantly reducing screening efficiency (traditional devices typically have a processing efficiency of less than 50 t / h).

[0004] Most traditional equipment uses a fixed-angle feed hopper, which cannot dynamically adjust the feed speed according to the material flow rate. This easily leads to inconsistent material levels in the screening chamber, affecting screening uniformity. Furthermore, iron impurities such as nails and steel bars mixed in solid waste, if not removed beforehand, can not only scratch the screen but also become stuck in the screen holes, causing blockages and even equipment malfunctions. Existing impurity removal devices are mostly independent of the screening system, increasing equipment footprint and cost. Utility Model Content

[0005] The purpose of this invention is to provide a multi-stage screening device for recycled aggregates from solid waste, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a multi-stage screening device for recycled solid waste aggregate, comprising a housing, a fixed ring, and a spiral downward screening frame. The housing has a screening cavity inside, and the fixed ring is arranged inside the screening cavity. Rubber pad assemblies are uniformly connected between the outer wall of the fixed ring and the inner wall of the screening cavity. Vibrating rods are uniformly installed on the inner wall of the fixed ring. A spiral downward screening frame is arranged at the center inside the fixed ring. A spiral flow channel is arranged inside the spiral flow channel. Screening section one, screening section two, screening section three, and a discharge port at the end of the spiral flow channel are arranged sequentially inside the spiral flow channel.

[0007] A feeding hopper is movably mounted on one end of the top of the box via a rotating shaft, and an electric push rod is movably mounted on the other end of the top of the box via a rotating seat. The other end of the electric push rod is movably connected to the bottom of the feeding hopper, and an electromagnet is installed on the inner side wall of the feeding hopper.

[0008] Preferably, the sieve section one, sieve section two, and sieve section three are respectively uniformly provided with sieve holes one, sieve holes two, and sieve holes three, and the apertures of sieve holes one, sieve holes two, and sieve holes three are in an increasing order.

[0009] Preferably, the bottom of the feeding hopper is provided with a feeding port that matches the opening at the top of the box, and a spring sleeve is provided between the feeding port and the opening at the top of the box. The feeding port is located above the starting section of the spiral downward screening frame, and a baffle is provided on one side of the starting section of the spiral downward screening frame.

[0010] Preferably, the bottom of the box is provided with a base, and the bottom of the side wall of the box is provided with a slot, and a controller is installed on the box above the slot.

[0011] Preferably, a receiving inner cylinder is detachably installed inside the slot. The receiving inner cylinder is divided into storage compartment 1, storage compartment 2, storage compartment 3 and storage compartment 4, and the positions of storage compartment 1, storage compartment 2, storage compartment 3 and storage compartment 4 correspond one-to-one with the positions of screening compartment 1, screening compartment 2, screening compartment 3 and the discharge port.

[0012] Preferably, the inner wall of the feed hopper is provided with a groove for accommodating the electromagnet, and the depth of the groove matches the thickness of the electromagnet.

[0013] This utility model provides a multi-stage screening device for recycled aggregates from solid waste, which has significant advantages over existing technologies, as detailed below:

[0014] 1. By setting up multi-stage screening zones (screening zone one, screening zone two, and screening zone three), with the screen aperture diameter increasing in each stage, multi-stage fine screening of aggregates can be achieved. This design allows aggregates of different particle sizes to be effectively separated in different screening zones, significantly improving screening accuracy and efficiency. The spiral downward screening frame design allows the aggregates to gradually move downward along the spiral flow channel during the screening process, avoiding the problems of aggregate accumulation and clogging in traditional screening devices, further improving screening efficiency.

[0015] 2. The feed hopper is movably connected to the top of the housing via an electric push rod, allowing for real-time adjustment of the hopper's inclination angle. This ensures that the aggregate enters the screening chamber uniformly and continuously, avoiding poor screening results caused by uneven feeding. Electromagnets installed on the inner wall of the feed hopper effectively prevent aggregate from sticking together during feeding, ensuring smooth feeding. The discharge port at the end of the spiral flow channel is rationally designed to ensure smooth discharge of the screened aggregate, reducing blockages and residues during the discharge process.

[0016] 3. The fixing ring inside the chamber is evenly connected to the screening cavity via a rubber pad assembly, effectively reducing the impact of vibration on the chamber and extending the service life of the device. The even installation of the vibrating rods makes the vibration generated during screening more uniform, further improving the screening effect while reducing wear on the device. The base at the bottom of the chamber and the slot design on the bottom of the side walls, with a detachable receiving cylinder inside the slot, and the zoned storage compartments (storage compartment one, storage compartment two, storage compartment three, and storage compartment four) corresponding to each screening section and discharge port, facilitate the classified collection and management of aggregates of different particle sizes. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0018] Figure 2 This is a top view of the internal structure of the box of this utility model;

[0019] Figure 3 This is a schematic diagram of the spiral downward screening frame structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the material receiving inner cylinder structure of this utility model;

[0021] Figure 5 This is a top view schematic diagram of the feed hopper structure of this utility model;

[0022] In the diagram: 1. Base; 2. Inner cylinder for receiving material; 3. Controller; 4. Rotating shaft; 5. Spring sleeve; 6. Feed hopper; 7. Electric push rod; 8. Rotating seat; 9. Box body; 10. Groove; 11. Fixing ring; 12. Screening inner cavity; 13. Rubber pad assembly; 14. Vibrating rod; 15. Spiral downward screening frame; 16. Screen hole three; 17. Screen hole one; 18. Screening section one; 19. Screening section three; 20. Spiral flow channel; 21. Baffle; 22. Discharge port; 23. Screening section two; 24. Screen hole two; 25. Storage compartment four; 26. Electromagnet; 27. Storage compartment one; 28. Storage compartment two; 29. ​​Storage compartment three; 30. Feed inlet; 31. Groove. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0024] Please see Figure 1-5 The present invention provides an embodiment of a multi-stage screening device for recycled solid waste aggregate, comprising a housing 9, a fixing ring 11, and a spiral downward screening frame 15. The housing 9 has a screening cavity 12 inside, and the fixing ring 11 is arranged inside the screening cavity 12. Rubber pad assemblies 13 are uniformly connected between the outer wall of the fixing ring 11 and the inner wall of the screening cavity 12. Vibrating rods 14 are uniformly installed on the inner wall of the fixing ring 11. The spiral downward screening frame 15 is arranged at the center inside the fixing ring 11. The spiral downward screening frame 15 has a spiral flow channel 20 inside, and screening section 18, screening section 23, screening section 3 19, and a discharge port 22 located at the end of the spiral flow channel 20 are arranged sequentially inside the spiral flow channel 20.

[0025] The interiors of sieve section 18, sieve section 23 and sieve section 39 are uniformly provided with sieve holes 17, 24 and 3 respectively, and the apertures of sieve holes 17, 24 and 3 are in an increasing order.

[0026] The overall structure of the multi-stage screening device for recycled solid waste aggregate includes a housing 9, inside which is a screening chamber 12. A fixing ring 11 is installed inside the screening chamber 12, and the outer wall of the fixing ring 11 is uniformly connected to the inner wall of the screening chamber 12 by a rubber pad assembly 13 to reduce vibration and noise.

[0027] Several vibrating rods 14 are evenly installed on the inner wall of the fixed ring 11. The function of the vibrating rods 14 is to promote the uniform distribution of recycled solid waste aggregate in the screening area and improve screening efficiency through high-frequency vibration. A spiral downward screening frame 15 is set at the center of the fixed ring 11.

[0028] The spiral downward screening frame 15 has a spiral flow channel 20 inside. The spiral flow channel 20 is designed so that the recycled solid waste aggregate can move downwards along the spiral path during the screening process, thereby passing through different screening zones in sequence.

[0029] The spiral flow channel 20 is internally provided with sieve section 18, sieve section 23, and sieve section 3 19, as well as a material discharge port 22 located at the end of the spiral flow channel 20. Sieve section 18, sieve section 23, and sieve section 3 19 are respectively provided with sieve aperture 17, sieve aperture 24, and sieve aperture 3 16 evenly arranged inside. The aperture diameters of sieve aperture 17, sieve aperture 24, and sieve aperture 3 16 increase progressively; specifically, sieve aperture 17 has the smallest aperture, sieve aperture 24 has a moderate aperture, and sieve aperture 3 16 has the largest aperture.

[0030] Specifically, the recycled aggregate from solid waste is evenly distributed in screening section 18 under the action of vibrating rod 14. Since screen aperture 17 has the smallest diameter, fine particles first pass through screen aperture 17 and fall into the next screening section. The remaining aggregate continues to move downwards along spiral channel 20 to screening section 23. In screening section 23, medium-sized particles pass through screen aperture 24 and fall into the next screening section. The remaining larger aggregate particles continue to move along spiral channel 20 to screening section 39. In screening section 39, larger particles pass through screen aperture 316 and fall into discharge port 22. The aggregate, after three stages of screening, is finally discharged from the device through discharge port 22, completing the screening process.

[0031] A feed hopper 6 is movably mounted on one end of the top of the box 9 via a rotating shaft 4, and an electric push rod 7 is movably mounted on the other end of the top of the box 9 via a rotating seat 8. The other end of the electric push rod 7 is movably connected to the bottom of the feed hopper 6, and an electromagnet 26 is installed on the inner side wall of the feed hopper 6.

[0032] The inner wall of the feed hopper 6 is provided with a groove 31 for accommodating the electromagnet 26, and the depth of the groove 31 matches the thickness of the electromagnet 26.

[0033] The bottom of the feed hopper 6 is provided with a feed inlet 30 that matches the top opening of the box 9, and a spring sleeve 5 is provided between the feed inlet 30 and the top opening of the box 9. The feed inlet 30 is located above the starting section of the spiral downward screening frame 15, and a baffle 21 is provided on one side of the starting section of the spiral downward screening frame 15.

[0034] The housing 9 is the main body of the device, and a feed hopper 6 is movably mounted on one of its top ends via a rotating shaft 4. The design of the rotating shaft 4 allows the feed hopper 6 to rotate within a certain angle range, facilitating material feeding and adjustment. An electric push rod 7 is movably mounted on the other end of the top of the housing 9 via a rotating seat 8, and the other end of the electric push rod 7 is movably connected to the bottom of the feed hopper 6. The function of the electric push rod 7 is to control the tilt angle of the feed hopper 6 through its telescopic movement, thereby controlling the feeding speed.

[0035] An electromagnet 26 is installed on the inner wall of the feed hopper 6 to attract ferrous objects in the material when necessary. The inner wall of the feed hopper 6 is provided with a groove 31 for accommodating the electromagnet 26, and the depth of the groove 31 matches the thickness of the electromagnet 26 to ensure that the electromagnet 26 can be firmly embedded in the groove 31 and will not fall off due to vibration or material impact.

[0036] The bottom of the feed hopper 6 is provided with a feed inlet 30 that matches the opening at the top of the housing 9. The design of the feed inlet 30 allows the material to enter the housing 9 smoothly. A spring sleeve 5 is provided between the feed inlet 30 and the opening at the top of the housing 9.

[0037] The feed inlet 30 is located above the starting section of the spiral downward screening frame 15 to ensure that the material is evenly distributed when entering the screening frame 15. A baffle 21 is provided on one side of the starting section of the spiral downward screening frame 15. The function of the baffle 21 is to guide the material to move along the direction of the spiral screening frame 15.

[0038] The bottom of the housing 9 is provided with a base 1, and the bottom of the side wall of the housing 9 is provided with a slot 10, and a controller 3 is installed on the housing 9 above the slot 10.

[0039] The inside of the slot 10 is detachably equipped with a receiving inner cylinder 2. The receiving inner cylinder 2 is divided into storage compartments 27, 28, 29 and 25. The positions of storage compartments 27, 28, 29 and 25 correspond one-to-one with the positions of screening compartments 18, 23, 19 and 22 and the discharge port 22.

[0040] The base 1 is made of high-strength material and has an anti-slip pad on the bottom to increase the friction between the device and the ground and prevent slippage. The top of the base 1 has fixing holes for connection to the bottom of the housing 9 using bolts or other fasteners.

[0041] The slot 10 is located at the bottom of the side wall of the box 9. The internal dimensions of the slot 10 match the external dimensions of the receiving inner cylinder 2, facilitating the insertion and removal of the receiving inner cylinder 2. A sealing strip is provided at the opening of the slot 10 to ensure the sealing of the slot after the receiving inner cylinder 2 is inserted.

[0042] The receiving inner cylinder 2 is a detachable component, and its internal structure is divided into storage compartments 27, 28, 29, and 25. Storage compartments 27, 28, 29, and 25 correspond one-to-one with the positions of screening compartments 18, 23, 19 and 22 and the discharge port 22, respectively.

[0043] When this application embodiment is used,

[0044] Power is switched on to controller 3, which activates electromagnet 26, causing it to adhere to the groove 31 on the inner wall of feed hopper 6, ensuring the electromagnet 26 is stable. Controller 3 is operated to control the extension and retraction of electric push rod 7, adjusting the tilt angle of feed hopper 6 around shaft 4 (linked to rotating seat 8), adjusting to a suitable feeding speed (adjust the tilt angle to a smaller value if the material flow is too high, and vice versa). Solid waste recycled aggregate is poured into feed hopper 6, and the material falls into housing 9 through inlet 30. At this time, electromagnet 26 adsorbs iron impurities (such as steel bars and nails) in the material, preventing damage to the screen. Spring sleeve 5 between inlet 30 and the top opening of housing 9 automatically buffers the material impact, reducing vibration transmission.

[0045] The material falls from the feed inlet 30 to the starting section of the spiral downward screening frame 15, and is guided into the spiral flow channel 20 by the baffle 21. 2. Start the controller 3 to drive the vibrating rod 14 on the inner wall of the fixed ring 11 to vibrate at high frequency (the vibration frequency can be adjusted by the controller 3), so that the material is evenly distributed in the screening area.

[0046] The material moves downwards along the spiral flow channel 20, first passing through screening section 18: screen hole 17 (smallest aperture) to screen fine particles. The aggregate passing through the screen hole falls below and enters the storage compartment 27 of the receiving inner cylinder 2. The material that does not pass through screening section 18 continues to move along the spiral flow channel 20 to screening section 23: screen hole 24 (medium aperture) to screen medium particles. The aggregate passing through the screen hole falls below and enters the storage compartment 28. The remaining material moves to screening section 319: screen hole 316 (largest aperture) to screen larger particles. The aggregate passing through the screen hole is discharged through the discharge port 22 and enters the storage compartment 329; the oversized particles that do not pass through the screen are discharged through the discharge port 22 at the end of the spiral flow channel 20 to the storage compartment 425.

[0047] During the screening process, the aggregates screened at each stage fall into the corresponding storage compartments of the receiving inner cylinder 2. When the storage compartments are nearly full, feeding is stopped. The receiving inner cylinder 2 is removed from the slot 10, and the materials in storage compartment 1 (fine aggregate), storage compartment 28 (medium aggregate), storage compartment 3 (coarse aggregate), and storage compartment 4 (oversized particles) are collected separately.

[0048] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0049] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0050] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0051] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A solid waste recycled aggregate multi-stage screening device, comprising a box body (9), a fixed ring (11) and a spiral downward screening frame (15), characterized in that: The box (9) is provided with a screening cavity (12) inside. A fixing ring (11) is provided inside the screening cavity (12). A rubber pad assembly (13) is uniformly connected between the outer wall of the fixing ring (11) and the inner wall of the screening cavity (12). A vibrating rod (14) is uniformly installed on the inner wall of the fixing ring (11). A spiral downward screening frame (15) is provided at the center inside the fixing ring (11). A spiral flow channel (20) is provided inside the spiral flow channel (20). Screening section one (18), screening section two (23), screening section three (19) and a discharge port (22) are provided at the end of the spiral flow channel (20) in sequence inside the spiral flow channel (20). The top of the box (9) is movably mounted with a feeding hopper (6) via a rotating shaft (4), and the other end of the top of the box (9) is movably mounted with an electric push rod (7) via a rotating seat (8). The other end of the electric push rod (7) is movably connected to the bottom of the feeding hopper (6), and an electromagnet (26) is installed on the inner side wall of the feeding hopper (6).

2. The solid waste recycled aggregate multi-stage screening device according to claim 1, characterized in that: The sieve section 1 (18), sieve section 2 (23) and sieve section 3 (19) are respectively uniformly provided with sieve holes 1 (17), sieve holes 2 (24) and sieve holes 3 (16), and the aperture of sieve holes 1 (17), sieve holes 2 (24) and sieve holes 3 (16) are in an increasing state.

3. The solid waste recycled aggregate multi-stage screening device according to claim 2, characterized in that: The bottom of the feed hopper (6) is provided with a feed inlet (30) that matches the top opening of the box (9), and a spring sleeve (5) is provided between the feed inlet (30) and the top opening of the box (9). The feed inlet (30) is located above the starting section of the spiral downward screening frame (15), and a baffle (21) is provided on one side of the starting section of the spiral downward screening frame (15).

4. The solid waste recycled aggregate multi-stage screening device according to claim 1, characterized in that: The bottom of the box (9) is provided with a base (1), and the bottom of the side wall of the box (9) is provided with a slot (10), and a controller (3) is installed on the box (9) above the slot (10).

5. The solid waste recycled aggregate multi-stage screening device according to claim 4, characterized in that: The inside of the slot (10) is detachably installed with a receiving inner cylinder (2). The receiving inner cylinder (2) is divided into storage compartments 1 (27), 2 (28), 3 (29) and 4 (25). The positions of storage compartments 1 (27), 2 (28), 3 (29) and 4 (25) correspond one-to-one with the positions of screening compartment 1 (18), screening compartment 2 (23), screening compartment 3 (19) and discharge port (22).

6. The solid waste recycled aggregate multi-stage screening device according to claim 1, characterized in that: The inner wall of the feed hopper (6) is provided with a groove (31) for accommodating the electromagnet (26), and the depth of the groove (31) matches the thickness of the electromagnet (26).

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