A screening device with a three-dimensional flexible internal circulation function and a screening method thereof

Abstract

The present application relates to material screening and mechanical conveying technical field, and disclose a kind of screening device and screening method with three-dimensional flexible inner circulation function, including screen cup, the screen cup has the porous side wall and porous bottom wall of surrounding screening cavity;Elastic spiral component, the elastic spiral component is set in the screening cavity of screen cup and extends around central axis, the inside of the elastic spiral component forms the central passage extending along central axis direction, the elastic spiral component is formed by winding circular cross-section elastic wire material, and its outer peripheral working surface is adjacent to the inner surface of screen cup porous side wall;Driving assembly, the driving assembly is connected with the driving end transmission of elastic spiral component.This application is by the cooperation of elastic spiral component and screen cup, so that particle material forms three-dimensional closed loop inner circulation flow path in screening cavity, material can be repeatedly close to screen surface, greatly increase the opportunity of fine particle through screen hole, significantly improve screening efficiency.

Description

Technical Field

[0001] This invention relates to the field of material screening and mechanical conveying technology, and in particular to a screening device and screening method with a three-dimensional flexible internal circulation function. Background Technology

[0002] In fields such as specialty coffee extraction, traditional Chinese medicine powder processing, and high-precision powder chemicals, the particle size uniformity of materials has a decisive impact on the quality of the final product. To remove excessively fine powders (such as fine coffee powder), porous sieves are typically used to sieve the materials.

[0003] However, traditional screening equipment typically employs vibrating, oscillating, or rigid spiral agitators, which have the following obvious technical drawbacks in practical applications:

[0004] 1. Mesh is easily clogged: Fine powders are easily electrostatically adsorbed or mechanically stuck in the mesh during the sieving process. Without a continuous scraping mechanism, the sieving efficiency will drop rapidly.

[0005] 2. Easily crushable materials (over-grinding): If existing technology introduces rigid blades or rigid augers with sharp edges for wall scraping, the strong mechanical shearing force, strong friction and hard collision can easily crush the originally qualified material particles again, producing more unpredictable fine powder, leading to a vicious cycle of more and more fine powder the more it is screened.

[0006] The structure cannot achieve flexible adaptive yielding: When traditional stirring blades or scrapers encounter stuck particles in the mesh, they will generate strong hard extrusion, which will not only completely cut the particles and destroy their original particle size, but also cause serious mechanical wear and the risk of machine failure to the screen and the components themselves. Summary of the Invention

[0007] This invention provides a screening device and screening method with a three-dimensional flexible internal circulation function, aiming to solve the technical problems of rigid stirring parts or scrapers in traditional screening equipment, which easily cause hard extrusion of materials, resulting in over-crushing, screen wear and jamming.

[0008] To solve the above-mentioned technical problems, according to one aspect of the present invention, more specifically, a screening device with a three-dimensional flexible internal circulation function, comprising:

[0009] A sieve cup body, the sieve cup body having a porous sidewall and a porous bottomwall surrounding a sieve cavity;

[0010] An elastic spiral component is disposed in the screening cavity of the screen cup and extends around the central axis. The inner side of the elastic spiral component forms a central channel extending along the central axis. The elastic spiral component is formed by winding a circular cross-section elastic wire, and its outer peripheral working surface is adjacent to the inner surface of the porous sidewall of the screen cup.

[0011] A drive assembly, which is connected to the drive end of the elastic helical member, is used to apply torque about the central axis to the elastic helical member;

[0012] The direction of rotation of the elastic spiral component, the position of the driving end, and the rotation direction of the driving component are coordinated to make the granular material close to the porous sidewall of the screen cup move in a spiral motion along the porous sidewall.

[0013] The elastic spiral member is configured such that when the input torque at the drive end and the reverse resistance exerted by the particulate material or the particles stuck in the screen holes cause at least a portion of the spiral member to tend to tighten, at least a portion of the spiral member elastically moves toward the central axis to reduce its effective outer diameter and increase the local gap between it and the porous sidewall of the screen cup; and when the reverse resistance decreases, at least a portion of the spiral member recovers toward the initial working outer diameter under its own elastic action.

[0014] Furthermore, the drive assembly is positioned above the screen cup and is connected to the upper end of the elastic spiral member for transmission.

[0015] The direction of rotation and the rotation of the elastic spiral component cause the particulate material near the porous sidewall of the screen cup to spiral downward along the porous sidewall of the screen cup. The particulate material gathers towards the center area at the bottom of the screen cup and flows back upward from the center area to the surface of the material. Then, it falls back from the surface of the material to the area near the porous sidewall of the screen cup, thus forming a three-dimensional closed-loop internal circulation path in the screening cavity of the screen cup, with the inner wall descending, the bottom concentric, the center ascending, and the surface returning to the wall.

[0016] Furthermore, the elastic helical member is either a right-handed helical member that rotates counterclockwise from the top view or a left-handed helical member that rotates clockwise from the top view.

[0017] Furthermore, the drive assembly is located at the bottom or below the screen cup body and has a bottom drive component that is drively connected to the lower end of the elastic spiral member;

[0018] The bottom drive component is a central drive component located at the center of the bottom of the screen cup, an integral bottom drive component that constitutes all or part of the bottom surface of the screening cavity of the screen cup, an annular bottom drive component arranged along the periphery of the bottom of the screen cup, or a combination of the above structures.

[0019] The direction of rotation and rotation of the elastic spiral component causes the granular material near the porous sidewall of the screen cup to spiral upward along the porous sidewall of the screen cup. After the granular material reaches the surface, it falls back towards the center area and moves towards the bottom center. When the bottom drive component rotates, it pushes the granular material in the bottom center area towards the porous sidewall of the screen cup, thereby forming a three-dimensional closed-loop internal circulation path with upward movement on the inner wall, centripetal movement on the surface, downward movement in the center, and return movement to the bottom wall.

[0020] Furthermore, the lower end of the bottom drive component and the elastic spiral component transmits torque through at least one of the following: a bent transmission section, a snap-fit ​​structure, a plug-in structure, a slotted fit structure, a friction fit structure, or an integral molding structure.

[0021] A powder-blocking sealing structure is provided at the relative motion boundary between the bottom drive component and the screen cup body. The powder-blocking sealing structure includes a flexible silicone seal, an elastic lip seal, a labyrinth seal, a micro-gap seal, an air seal, or a combination thereof.

[0022] Furthermore, the elastic helical member is either a right-handed helical member that rotates clockwise from the top view or a left-handed helical member that rotates counterclockwise from the top view.

[0023] Furthermore, the drive assembly includes an active magnetic component located outside the screen cup and a driven magnetic component that is driven by the elastic helical component. The active magnetic component and the driven magnetic component are magnetically coupled through a non-magnetic separator to transmit the torque.

[0024] Furthermore, a material collecting device is detachably provided below the screen cup body, which is used to allow fine particles passing through the screen holes to fall into the material collecting device.

[0025] Furthermore, the screen cup body is made of a thin stainless steel sheet with sieve holes, the outer diameter of the screen cup body is 3cm to 15cm, the height is 5cm to 20cm, and the sieve hole diameter is 0.1mm to 2mm; the elastic filament diameter of the elastic spiral component is 0.5mm to 5mm, and the pitch of the elastic spiral component is 0.5cm to 3cm; wherein the initial filling height of the particulate material is 30% to 70% of the height of the screen cup body.

[0026] A method for screening particulate materials using a screening device includes:

[0027] Step S1: Load the particulate material into the screening chamber of the screen cup;

[0028] Step S2: Drive the elastic spiral component to rotate around the central axis, so that the particulate material near the porous sidewall moves in a spiral motion along the porous sidewall;

[0029] Step S3: The particulate material forms a three-dimensional closed-loop internal circulation flow path in the screening chamber, consisting of spiral motion on the inner wall, bottom motion, central reflux motion in the central channel, and surface reflux motion of the material, and fine particles with a particle size smaller than the sieve aperture are discharged through the sieve aperture.

[0030] Step S4: When the elastic spiral member is subjected to reverse resistance, at least a portion of the spiral member is elastically reduced in diameter to reduce the continuous compression of the particulate material near the screen wall, and after the reverse resistance is reduced, at least a portion of the spiral member is restored to the initial working outer diameter.

[0031] The present invention provides a screening device and screening method with a three-dimensional flexible internal circulation function. Compared with the prior art, the beneficial effects achieved by the present invention include:

[0032] 1. This invention, through the cooperation of the elastic spiral component and the screen cup, enables the particulate material to form a three-dimensional closed-loop internal circulation flow path in the screening chamber, allowing the material to repeatedly approach the screen surface, greatly increasing the chance of fine particles passing through the screen holes and significantly improving screening efficiency.

[0033] 2. This invention utilizes the structural characteristics of the elastic spiral component formed by winding elastic wire with a circular cross section. When encountering stuck particles or local resistance, the corresponding coil segment can elastically shrink towards the central axis and automatically increase the local gap with the screen wall, thereby avoiding secondary crushing of particles caused by continuous hard extrusion and effectively protecting the original particle size distribution of the material.

[0034] 3. This invention abandons the sharp edges of traditional rigid blades or scrapers, and uses a round cross-section elastic filament to flexibly contact the material, minimizing cutting action during stirring and propulsion, thus reducing the risk of adding uncontrollable fine powder during the screening process from the root.

[0035] 4. This invention provides a variety of drive layout options, such as top drive, bottom center drive, integral bottom drive, ring bottom drive, and non-contact magnetic transmission, which can flexibly adapt to different machine space and cleaning needs, and facilitate modular design and quick disassembly and maintenance.

[0036] 5. The present invention has a flexible sealing structure at the relative movement boundary between the bottom drive component and the fixed cup body, which can effectively prevent fine powder from penetrating into the transmission gap, thus ensuring the stability of long-term operation and avoiding waste and pollution caused by material leakage. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the overall structure of the screening device of the present invention.

[0038] Figure 2 This is an exploded structural diagram of the cup body, screen, and elastic spiral component in this invention.

[0039] Figure 3 This is a top view of the cup body in this invention.

[0040] Figure 4 This is a schematic diagram of the structure of the drive body and rotating body in this invention.

[0041] Figure 5 This is a cross-sectional schematic diagram of two arrangements for the three-dimensional closed-loop internal circulation of particulate materials in this invention.

[0042] Figure 6 This is a schematic diagram of material tumbling and three-dimensional closed-loop flow in the top-driven state of the present invention.

[0043] Figure 7 This is a schematic diagram of material tumbling and three-dimensional closed-loop flow in the bottom-driven state of the present invention.

[0044] In the diagram: 1. Drive assembly; 2. Material collection component; 3. Collar; 4. Scraper groove; 5. Rubber scraper; 6. Connecting slot; 7. Screen cup body; 8. Elastic spiral component; 9. Connecting ring; 10. Connecting buckle; 11. Drive end; 801. Bending transmission section; 1101. Locking block. Detailed Implementation

[0045] To make the technical solution of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0046] Example 1:

[0047] like Figures 1 to 4 As shown, the screening device includes a drive assembly 1, a material collection component 2, and a collar 3 disposed in the area connecting the two. A screen cup 7 is disposed within the material collection component 2, forming a screening cavity for containing particulate material. An elastic spiral component 8 extends around the central axis of the screening cavity and is disposed inside the screen cup 7. The porous sidewalls and bottom wall of the screen cup 7 allow fine particles smaller than the sieve aperture to pass through. The drive assembly 1 contains a drive motor and a reduction transmission mechanism. The power generated by the drive motor is reduced and amplified by the reduction transmission mechanism before being transmitted to the drive end 11, causing the drive end 11 to rotate smoothly at a low speed around the central axis.

[0048] like Figure 2 and Figure 3 As shown, the inner wall of the material collecting component 2 may be provided with at least two scraper grooves 4, and a rubber scraper 5 is provided in the scraper groove 4; a connecting ring 9 may be provided at the upper end of the screen cup body 7. When the screen cup body 7 is removed or rotated, the rubber scraper 5 can scrape off the residual material on the outer surface of the screen cup body 7. A connecting groove 6 is provided on the inner wall of the collar 3, and a connecting buckle 10 that cooperates with the connecting groove 6 is provided on the drive component 1 to form a detachable connection.

[0049] like Figure 2 and Figure 4 As shown, in one optional transmission structure, the locking blocks of the elastic helical member 8 are bent towards the central axis to form a bending transmission section 801. The output end of the drive assembly 1 is provided with a drive end 11, and the surface of the drive end 11 is provided with multiple locking blocks 1101; the bending transmission section 801 is engaged between the locking blocks 1101, enabling the drive end 11 to transmit torque to the elastic helical member 8. This locking transmission structure is only an example; plug-in, slotted, friction-fit, integral molding, or other connection structures capable of transmitting torque can also be used.

[0050] The elastic spiral member 8 is wound with a circular cross-section elastic filament, and its outer peripheral working surface is adjacent to the inner surface of the screen cup 7, forming a central channel extending axially on its inner side. In one size example, the outer diameter of the screen cup 7 is 3 cm to 15 cm, the height is 5 cm to 20 cm, and the screen aperture is 0.1 mm to 2 mm; the diameter of the elastic filament is 0.5 mm to 5 mm, and the pitch of the elastic spiral member 8 is 0.5 cm to 3 cm. The initial filling height of the particulate material can be 30% to 70% of the effective height of the screen cup 7.

[0051] The elastic helical member 8 has an initial working outer diameter, which is smaller than the inner diameter of the screen cup 7 to form an initial working gap between them. The driving end 11 of the elastic helical member 8 is constrained to rotate synchronously with the output end of the driving assembly 1, thereby causing the elastic helical member 8 to rotate about its central axis under the action of driving torque. The elastic helical member 8 is wound from a circular cross-section elastic wire, and each of its segments has the same helical diameter in the free state, which is configured to be adjacent to the inner surface of the porous sidewall of the screen cup 7. In the assembled state, there is a preset initial gap between the outer peripheral working surface of the elastic helical member 8 and the inner surface of the porous sidewall of the screen cup 7.

[0052] Example 2:

[0053] Figure 6 This illustrates the material tumbling process in top-driven mode. Figure 6 and Figure 7 In the diagram, configurations A, B, C, and D, marked next to the top-view arrow, represent different combinations of spiral direction and rotation direction; B, C, D, E, and F, marked next to the cross-sectional arrow, represent movement along the screen wall, bottom convergence or backflow, central backflow in the central channel, surface diffusion or backflow of material, and fine particle discharge direction, respectively.

[0054] When the driving component is positioned above the screen cup 7 and drives the upper end of the elastic spiral member 8, the right-handed elastic spiral member 8 rotates counterclockwise from the top view, or the left-handed elastic spiral member 8 rotates clockwise from the top view, causing the particulate material near the inner wall of the screen cup 7 to spiral downwards along the inner wall. After reaching the bottom, the material converges towards the central area, flows upwards through the central channel inside the elastic spiral member 8, and diffuses outwards from the surface layer of the material, falling back to the vicinity of the screen cup 7, thus forming a three-dimensional closed-loop internal circulation of downward flow along the inner wall, inward flow from the bottom, upward flow from the center, and return flow to the surface layer.

[0055] Figure 7 This illustrates a material tumbling process under bottom-driven conditions. When the bottom drive unit drives the lower end of the elastic spiral member 8, it changes the matching relationship between the rotation direction and the spiral direction of the elastic spiral member 8, causing the material near the inner wall of the screen cup 7 to spiral upwards. After reaching the surface, the material falls back towards the center area, moves towards the bottom center through the central channel, and is redirected back to the inner wall of the screen cup 7 by the bottom drive unit or its feeding part, thus forming a closed-loop flow path of upward movement on the inner wall, inward movement on the surface, downward movement in the center, and return movement to the bottom wall. During the circulation process, fine particles are continuously discharged through the screen holes of the screen cup 7.

[0056] Example 3:

[0057] When driven from the bottom, the drive assembly can be located at or below the bottom of the screen cup 7. Its output end can be... Figure 7 The central drive component located at the bottom center, as shown, can also be an integral bottom drive component forming all or part of the bottom surface of the screening cavity, an annular bottom drive component provided along the bottom periphery of the material collection component 2, or a combination of the above structures. The integral bottom drive component can rotate together with the lower end of the material-pushing protrusion, material-pushing rib, or elastic spiral component 8 on the bottom surface, causing the material in the bottom center area to move back towards the porous sidewall of the screen cup body 7. Figure 7 The central drive component shown is only one embodiment and does not exclude the entire bottom or bottom perimeter as the drive output end.

[0058] When a relative motion boundary is formed between the bottom drive component and the fixed part of the material collecting component 2, a flexible sealing part can be provided at this boundary. The flexible sealing part can be a food-grade or material-compatible flexible silicone sealing ring, an elastic lip seal, or a labyrinth seal, a micro-gap seal, an air seal, or a combination of the above. The flexible sealing part can be located at the outer periphery of the integral bottom drive component, the inner or outer edge of the annular bottom drive component, or at the boundary where the central drive component passes through the bottom of the cup, to prevent or reduce the entry of particulate material into the relative motion gap.

[0059] The lower ends of the bottom drive component and the elastic spiral component 8 can transmit torque through a bending transmission section 801, a locking block 1101, an insertion slot, a snap-fit, a friction fit, a fastening connection, or an integrally formed structure. The bottom drive component can also be equipped with a material guiding part to guide the granular material at the lower end of the central channel to the porous sidewall of the screen cup 7. Top drive and bottom drive are optional implementations and are not required to be provided simultaneously.

[0060] Example 4:

[0061] In the magnetic drive scheme not shown separately, the drive assembly includes an active magnetic component disposed outside the material collecting member 2 and a driven magnetic component that is drively connected to the elastic spiral member 8 or the bottom drive member. The active and driven magnetic components are magnetically coupled through the cup bottom, base shell, or other non-magnetic interlayers, allowing external power to transmit torque without the need for a through-type drive component. The screen cup 7 and the material collecting member 2 can be positioned above the drive assembly.

[0062] Example 5:

[0063] By selecting the rotation direction, locking position, and rotation direction of the elastic spiral component 8, the input torque at the drive end and the reverse resistance generated by the particulate material create a tightening trend within the elastic spiral component 8. When a certain segment contacts a particle stuck in the sieve hole or experiences significant local resistance, that segment moves elastically towards the central axis, reducing its effective outer diameter and increasing the local gap between that segment and the inner wall of the sieve cup 7.

[0064] The aforementioned localized gaps allow the elastic helical member 8 to bypass, release, or reduce the continuous compression on the obstructed particles. Once the obstructed particles are released or the overall motion resistance decreases, the corresponding loop segment recovers towards its initial working outer diameter under the restoring force of the elastic filament. This mechanical retraction process can operate independently or in conjunction with stop, reverse, or intermittent operation protection implemented by drive load detection.

[0065] Screening method:

[0066] Select the screen aperture size of the screen cup 7 according to the target fine particle size, load the particulate material into the screening cavity formed by the screen cup 7, and maintain circulation space above the material surface. Configure the corresponding transmission connection and necessary bottom powder blocking sealing structure according to the selected top drive, center bottom drive, integral bottom drive, annular bottom drive or magnetic transmission scheme; select the rotation direction according to the rotation direction of the elastic spiral component 8 and the position of the locking block, start the drive assembly, so that the particulate material near the screen wall moves in a spiral motion along the screen cup 7.

[0067] A closed-loop circulation is formed through the spiral motion on the inner wall, the bottom motion, the central reflux in the central channel, and the surface reflux, allowing fine particles to be discharged through the screen holes. When the elastic spiral component 8 encounters reverse resistance, it uses its elastic reduction to form a local clearance gap; after the target screening time or fine particle discharge amount is reached, the drive stops, the particles in the retained screen cup 7 are removed, and the material collection component 2 is cleaned.

[0068] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A screening device with a three-dimensional flexible internal circulation function, characterized in that, include: The screen cup (7) has a porous sidewall and a porous bottomwall that form a screening cavity; The elastic spiral component (8) is disposed in the screening cavity of the screen cup body (7) and extends around the central axis. The inner side of the elastic spiral component (8) forms a central channel extending along the central axis. The elastic spiral component (8) is formed by winding a circular cross-section elastic wire, and its outer peripheral working surface is adjacent to the inner surface of the porous sidewall of the screen cup body (7). A drive assembly (1) is connected to the drive end (11) of the elastic helical member (8) for applying a torque about the central axis to the elastic helical member (8). The direction of rotation of the elastic spiral component (8), the position of the driving end (11) and the rotation direction of the driving component (1) are matched so that the granular material close to the porous sidewall of the screen cup (7) moves in a spiral motion along the porous sidewall. The elastic spiral member (8) is configured such that when the input torque of the drive end (11) and the reverse resistance exerted by the particulate material or the particles stuck in the screen hole cause at least a portion of the coil of the elastic spiral member (8) to tighten, at least a portion of the coil moves elastically toward the central axis to reduce its effective outer diameter and increase the local gap between it and the porous sidewall of the screen cup (7); and when the reverse resistance decreases, at least a portion of the coil recovers toward the initial working outer diameter under its own elastic action.

2. The screening device with three-dimensional flexible internal circulation function according to claim 1, characterized in that: The drive assembly (1) is positioned above the screen cup body (7) and is connected to the upper end of the elastic spiral member (8) for transmission. The rotation direction and rotation direction of the elastic spiral component (8) cause the particulate material near the porous sidewall of the screen cup (7) to spiral downward along the porous sidewall of the screen cup (7). The particulate material gathers towards the central area at the bottom of the screen cup (7) and flows back upward from the central area to the surface of the material. Then, it falls back from the surface of the material to the area near the porous sidewall of the screen cup (7), thereby forming a three-dimensional closed-loop internal circulation flow path in the screening cavity of the screen cup (7) with the inner wall descending, the bottom towards the center, the center ascending, and the surface returning to the wall.

3. The screening device with three-dimensional flexible internal circulation function according to claim 2, characterized in that: The elastic helical member (8) is either a right-handed helical member that rotates counterclockwise from the top view or a left-handed helical member that rotates clockwise from the top view.

4. The screening device with three-dimensional flexible internal circulation function according to claim 1, characterized in that: The drive assembly (1) is located at the bottom or below the screen cup body (7) and has a bottom drive component that is connected to the lower end of the elastic spiral member (8). The bottom drive component is a central drive component located at the center of the bottom of the screen cup body (7), an integral bottom drive component that constitutes all or part of the bottom surface of the screening cavity of the screen cup body (7), an annular bottom drive component provided along the periphery of the bottom of the screen cup body (7), or a combination of the above structures. The direction of rotation and rotation of the elastic spiral component (8) causes the granular material near the porous sidewall of the screen cup (7) to spiral upward along the porous sidewall of the screen cup (7). After the granular material reaches the surface, it falls back to the central area and moves towards the bottom center. When the bottom drive component rotates, it pushes the granular material in the bottom center area towards the porous sidewall of the screen cup (7), thereby forming a three-dimensional closed-loop internal circulation path with upward movement on the inner wall, centripetal movement on the surface, downward movement in the center, and return movement to the bottom wall.

5. The screening device with three-dimensional flexible internal circulation function according to claim 4, characterized in that: The bottom drive component and the lower end of the elastic spiral component (8) transmit torque through at least one of the following: bending transmission section, snap-fit ​​structure, plug-in structure, slotted structure, friction fit structure or integral molding structure. A powder-blocking sealing structure is provided at the relative motion boundary between the bottom drive component and the screen cup body (7). The powder-blocking sealing structure includes a flexible silicone seal, an elastic lip seal, a labyrinth seal, a micro-gap seal, an air seal, or a combination thereof.

6. The screening device with three-dimensional flexible internal circulation function according to claim 5, characterized in that: The elastic helical member (8) is either a right-handed helical member that rotates clockwise from the top view or a left-handed helical member that rotates counterclockwise from the top view.

7. The screening device with three-dimensional flexible internal circulation function according to claim 1, characterized in that: The drive assembly (1) includes an active magnetic component located outside the screen cup body (7) and a driven magnetic component that is connected to the elastic spiral component (8) in a transmission manner. The active magnetic component and the driven magnetic component are magnetically coupled through a non-magnetic separator to transmit the torque.

8. The screening device with three-dimensional flexible internal circulation function according to claim 1, characterized in that: A material collection device (2) is detachably provided below the screen cup body (7) for allowing fine particles passing through the screen holes to fall into the material collection device (2).

9. The screening device with three-dimensional flexible internal circulation function according to claim 1, characterized in that: The screen cup (7) is made of a stainless steel sheet with sieve holes. The outer diameter of the screen cup (7) is 3cm-15cm, the height is 5cm-20cm, and the sieve hole diameter is 0.1mm-2mm. The elastic wire diameter of the elastic spiral component (8) is 0.5mm-5mm, and the pitch of the elastic spiral component (8) is 0.5cm-3cm. The initial filling height of the granular material is 30% to 70% of the height of the screen cup (7).

10. A method for screening particulate materials using the screening device according to any one of claims 1 to 9, comprising: Step S1: Load the particulate material into the screening chamber of the screen cup (7); Step S2: Drive the elastic spiral component (8) to rotate around the central axis, so that the particulate material near the porous sidewall moves in a spiral motion along the porous sidewall; Step S3: The particulate material forms a three-dimensional closed-loop internal circulation flow path in the screening chamber, consisting of spiral motion on the inner wall, bottom motion, central reflux motion in the central channel, and surface reflux motion of the material, and fine particles with a particle size smaller than the sieve aperture are discharged through the sieve aperture. Step S4: When the elastic spiral member (8) is subjected to reverse resistance, at least a portion of the spiral member (8) is elastically reduced in diameter to reduce the continuous compression of the particulate material near the screen wall, and at least a portion of the spiral member (8) is restored to the initial working outer diameter after the reverse resistance is reduced.

Images