A screening device for a mixture
Patent Information
- Application Number
- CN202522107378.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-29
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-09-29
AI Technical Summary
In existing technologies, the screening efficiency of granular materials falling off the ground during the production of monocrystalline silicon is low, which cannot effectively screen granular materials with similar physical shapes and irregular fragments, and is prone to secondary pollution.
A multi-stage screening inclined plate device is adopted. The inclination and discharge port size of the screening inclined plate are adjusted by the adjustment mechanism and the moving mechanism. By combining screening inclined plates with different roughness and length, the effective screening of granular materials and irregular crushed materials is achieved by utilizing the friction coefficient and particle size difference, and metal particles are adsorbed by magnetic strips.
It improves screening efficiency and effectiveness, reduces production costs, ensures the utilization rate of granular materials, and reduces the power consumption of the crystal pulling process in single crystal furnaces.
Smart Images
Figure CN224926464U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of screening equipment technology, and in particular relates to a screening device for mixed materials. Background Technology
[0002] In the production of monocrystalline silicon, the fallen particles are usually attached with impurities such as dust and metal shavings, and are also mixed with irregular fragments such as flakes and blocks. Therefore, the mixed particles that have fallen need to be screened before they can be used.
[0003] In existing technologies, manual screening is inefficient and cannot effectively separate impurities, requiring a cleaning process that is cumbersome and prone to secondary contamination, thus failing to guarantee screening results. Traditional vibrating screens, based on particle size differences, suffer from poor screening of granular materials and irregular fragments due to their similar shapes, necessitating secondary manual sorting. Utility Model Content
[0004] To solve the above-mentioned technical problems, this utility model provides a screening device for mixed materials, which effectively solves the technical problems of low screening efficiency of granular materials, inability to effectively screen granular materials with similar physical shapes and irregular crushed materials, and poor screening effect, thus overcoming the shortcomings of the prior art.
[0005] The technical solution adopted in this utility model is: a screening device for a mixture, comprising:
[0006] The screening body has multiple screening inclined plates with preset roughness and / or length arranged sequentially at its bottom along the feeding direction, and a feeding port is provided between two adjacent screening inclined plates;
[0007] An adjustment mechanism, hinged to the screening body, is used to adjust the inclination of the screening body relative to the horizontal plane.
[0008] Furthermore, it also includes a moving mechanism, which is disposed between the bottom of the screening inclined plate and the screening body, to drive the screening inclined plate to move relative to the screening body and adjust the size of the discharge port.
[0009] Furthermore, the screening inclined plate includes a first screening inclined plate, a second screening inclined plate, and a third screening inclined plate arranged sequentially along the feeding direction, and the first screening inclined plate, the second screening inclined plate, and the third screening inclined plate have a preset inclination with the screening body.
[0010] Furthermore, the roughness of the first screening inclined plate is less than that of the second screening inclined plate, and the roughness of the second screening inclined plate is less than that of the third screening inclined plate.
[0011] Furthermore, the length of the first screening inclined plate is greater than the length of the second screening inclined plate, and the length of the second screening inclined plate is greater than the length of the third screening inclined plate.
[0012] Furthermore, the discharge port includes a first discharge port, a second discharge port, and a third discharge port. The first discharge port is disposed between the first screening inclined plate and the second screening inclined plate, the second discharge port is disposed between the second screening inclined plate and the third screening inclined plate, and the third discharge port is disposed at the discharge end of the third screening inclined plate.
[0013] Furthermore, the first discharge port is equipped with a first collecting device, the second discharge port is equipped with a second collecting device, and the third discharge port is equipped with a third collecting device.
[0014] Furthermore, the adjustment mechanism includes an adjustment screw, which is mounted on the support frame and movably connected to the support frame. The support frame is located below the screening body, and the top of the adjustment screw is hinged to the screening body, which can drive one end of the screening body to move up and down.
[0015] Furthermore, the screening body has an elongated groove on its side opposite to the screening inclined plate, the screening inclined plate is movably connected to the elongated groove, and the moving mechanism includes a moving screw, which is disposed on the screening body and connected to the screening inclined plate at its top. The moving screw can drive the screening inclined plate to move along the elongated groove.
[0016] Furthermore, the third screening inclined plate is provided with magnetic strips.
[0017] The advantages and positive effects of this utility model are:
[0018] 1. By adopting the above technical solution, based on the different friction coefficients of the mixture, the screening inclined plate realizes the effective screening of granular materials and irregular crushed materials with similar physical morphology. The structure is simple, the operation is convenient, and the screening efficiency is improved.
[0019] 2. By setting up first, second, and third screening inclined plates with different roughness and lengths, screening of materials with different friction coefficients is achieved. This enables the screening of impurities and irregular fragments in the mixture, ensuring screening effect, improving the utilization rate of granular materials, and the screened granular materials can be used as raw materials for the production of silicon wafers G12R / G12, reducing the material consumption of single crystal furnace crystal pulling, and achieving the overall goal of reducing power consumption.
[0020] 3. By setting up multiple feeding ports and collecting devices, the screened materials can be fed and collected.
[0021] 4. The dynamic adjustment of the screening inclined plate is achieved by setting an adjustment mechanism and a moving mechanism, which is suitable for screening particles with different friction coefficients and particle sizes.
[0022] 5. By blowing and extracting light impurities from the mixture in the storage silo, the cleanliness is improved, eliminating the need for a cleaning process and reducing production costs.
[0023] 6. By setting magnetic strips on the third screening inclined plate, metal particles in the mixture can be adsorbed, further ensuring the screening effect and improving the utilization rate of granular materials. Attached Figure Description
[0024] The above and other objects, features, and advantages of this utility model will become more apparent from the more detailed description of the embodiments thereof in conjunction with the accompanying drawings. The drawings are provided to further illustrate the embodiments of this utility model and form part of the specification. They are used together with the embodiments of this utility model to explain the utility model and do not constitute a limitation thereof. In the drawings, the same reference numerals generally represent the same parts or steps.
[0025] Figure 1 This is a perspective view of a screening device for a mixture according to an embodiment of the present invention.
[0026] Figure 2 This is a side view of a screening device for a mixture according to an embodiment of the present invention.
[0027] Figure 3 This is a schematic diagram of the moving mechanism of a screening device for a mixture according to an embodiment of the present invention.
[0028] Figure 4 This is a structural diagram of the internal structure of the screening device for a mixture according to an embodiment of the present invention, showing the removal of the screening inclined plate.
[0029] Figure 5 This is a schematic diagram of the adjustment mechanism of a screening device for a mixture according to an embodiment of the present invention.
[0030] In the diagram: 1. First screening inclined plate; 2. Second screening inclined plate; 3. Third screening inclined plate; 4. Longitudinal frame; 5. Side baffle; 6. Crossbeam; 7. Guide strip; 8. First discharge port; 9. Second discharge port; 10. Third discharge port; 11. First collecting device; 12. Second collecting device; 13. Third collecting device; 14. Guide plate; 15. Baffle; 16. First long groove; 17. Second long groove; 18. Third long groove; 19. Moving screw; 20. Connector; 21. Adjusting screw; 22. Support frame; 23. Support block; 24. Support plate; 25. Long hole; 26. Nut; 27. Support rod; 28. Storage bin; 29. Partition; 30. Through slot; 31. Vibrator Detailed Implementation
[0031] This utility model provides a screening device for a mixture. The embodiments of this utility model are described below with reference to the accompanying drawings.
[0032] In the description of the embodiments of this utility model, it should be understood that the terms "top," "bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, it should be noted that unless otherwise expressly specified and limited, the terms "set" and "connected" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two elements. Those skilled in the art can understand the specific meaning of the above terms in this utility model through specific circumstances.
[0033] like Figure 1 , Figure 2 and Figure 3 As shown in the figure, an embodiment of the present invention provides a screening device for a mixture, comprising a screening body, a moving mechanism, and an adjusting mechanism. Multiple screening inclined plates with preset roughness and / or length are sequentially arranged at the bottom of the screening body along the feeding direction. A feeding port is provided between adjacent screening inclined plates, and the screening inclined plates are movably connected to the screening body. The moving mechanism is located between the bottom of the screening inclined plates and the screening body, driving the screening inclined plates to move relative to the screening body to adjust the size of the feeding port. The adjusting mechanism is hinged to the screening body to adjust the inclination of the screening body relative to the horizontal plane.
[0034] The screening principle of this device is the inclined plane separation principle. Due to differences in shape, mass, friction factor, and flowability between granular materials and impurities, irregular fragments, etc., the sliding acceleration or sliding inertial force varies on sliding surfaces with the same slope but different or the same friction, resulting in different sliding or rolling distances within the same vibration or sliding cycle. In inclined plane separation, when the material is on an inclined plane with an inclination of θ, it is mainly subjected to two forces: the component of gravity along the inclined plane, mgsinθ, and the friction force, μmgcosθ. Whether the material can move and the speed of movement depends on the magnitude of these two forces. The coefficient of friction, μ, is a key variable, which depends on the characteristics of the particles themselves (such as density, shape, and surface roughness) and the material of the inclined plane. The material enters from the upper end of the inclined plane. Under the action of gravity, spherical, smooth, and dense particles roll or slide faster and reach the bottom first, while flat, rough, and low-density particles move slower or are directly stuck. The friction angle is the minimum inclination angle at which an object begins to slide on an inclined plane, and the coefficient of friction is equal to the tangent of the friction angle. Materials with high density, spherical shape, and smooth surface have a low coefficient of friction, resulting in a small angle of friction. They can begin to slide on inclined surfaces with a gentle slope, and their sliding speed is fast and the sliding distance is long. Materials with low density, flaky shape, and rough surface have a high coefficient of friction, resulting in a large angle of friction. They can only begin to slide on inclined surfaces with a steep slope, and their sliding speed is slow and the sliding distance is short.
[0035] In this embodiment, the screening body is configured as an inclined rectangular open box-type frame structure, with the higher end being the feed end and the lower end being the discharge end. Multiple screening inclined plates are sequentially arranged at the bottom of the screening body along the feeding direction. The frame structure includes a longitudinal frame 4, which is arranged along the feeding direction. To prevent the mixture from leaking out from the sides during the feeding process, side baffles 5 are fixed to both sides of the longitudinal frame 4. The screening inclined plates are arranged on the side baffles, parallel to the bottom of the screening body. An adjustment mechanism adjusts the inclination of the screening body so that multiple screening bodies have the same inclination. This inclination allows materials with a lower coefficient of friction to slide smoothly and for a longer distance, while materials with a higher coefficient of friction slide more difficultly and for a shorter distance. That is, mixtures with different coefficients of friction move different distances on screening inclined plates with the same inclination. A discharge port is set at a position where the material is about to reach its maximum movement distance, allowing the material to be discharged directly from the discharge port, thereby achieving the screening of the mixture. In this embodiment, the mixture includes granular material and irregular fragments. Granular materials and irregularly shaped crushed materials have similar shapes, but their coefficients of friction differ. The coefficient of friction for granular materials is 0.1–0.3, while that for irregularly shaped crushed materials is 0.4–0.6. Since the coefficient of friction for granular materials is less than that for irregularly shaped crushed materials, the friction angle of granular materials is also smaller. An adjusting mechanism is used to adjust the inclination of the screening body (screening ramp) so that this inclination is greater than the friction angle of spherical granules but less than that of irregularly shaped crushed materials. This allows spherical granules to slide smoothly on the screening ramp (acceleration state) and slide a relatively long distance along the ramp to the discharge end of the screening body, while making it difficult for irregularly shaped crushed materials to slide on the ramp (deceleration state), allowing them to slide only a short distance and be discharged through the discharge port between the screening ramps. This achieves the screening of mixtures with similar shapes but different coefficients of friction. Preferably, the inclination of the screening plate is set to 5° to 25°. For example, the inclination of the screening plate can be set to 5°, 8°, 10°, 12°, 15°, 18°, 20°, 22° or 25°.
[0036] Because granular materials vary in size, larger particles are more affected by gravity and have greater inertia, accelerating faster as they slide down the screening plate into the feed inlet. Smaller particles, due to friction, air resistance, and their own gravity, have lower acceleration and slide down more slowly. To accommodate the separation of particles of different sizes and ensure that all particles slide down the screening plate, the inclination of the screening plate is set according to the particle size. The larger the particle size, the smaller the inclination of the screening plate; the smaller the particle size, the larger the inclination of the screening plate. For large-diameter granules (greater than 10mm), the inclination of the screening plate is set to 5°–10°. Examples include 5°, 6°, 7°, 8°, 9°, or 10°. A smaller inclination reduces rolling speed and prevents impact damage. For medium-diameter granules (3–10mm), the inclination of the screening plate is set to 10°–20°. Examples include 10°, 11°, 12°, 13°, 14°, 15°, 16°, 17°, 18°, 19°, or 20°. This balances sorting efficiency with flowability. For small-diameter granules (less than 3mm), the inclination of the screening plate is set to 20°–25°. Examples include 20°, 21°, 22°, 23°, 24°, or 25°. A larger inclination accelerates sorting and reduces accumulation. Specifically, the screening inclined plates include a first screening inclined plate 1, a second screening inclined plate 2, and a third screening inclined plate 3 arranged sequentially along the material feeding direction. These three inclined plates are mounted on the screening body and have the same inclination angle as the screening body. By using multiple screening inclined plates, different materials in the mixture are screened. The first screening inclined plate 1 is used to screen materials that are difficult to slide in the mixture, including flaky fragments in irregular crushed materials and larger flaky impurities. Flaky materials are not easy to slide on the inclined surface. The second screening inclined plate 2 is used to screen lumpy fragments in irregular crushed materials, further screening the irregular crushed materials. The third screening inclined plate 3 is used to screen metal particles in the impurities.
[0037] To facilitate the installation and adjustment of the first screening inclined plate 1, the second screening inclined plate 2, and the third screening inclined plate 3, they are installed on the screening body. In this embodiment, the first screening inclined plate 1, the second screening inclined plate 2, and the third screening inclined plate 3 are installed on the longitudinal frame 4 along the material feeding direction. The inclination of the longitudinal frame 4 is the same as the inclination of the first screening inclined plate 1, the second screening inclined plate 2, and the third screening inclined plate 3. Preferably, to facilitate the sliding of the mixture along the screening inclined plate and reduce collision with the screening body, guide strips 7 are fixed to the first screening inclined plate 1, the second screening inclined plate 2, and the third screening inclined plate 3. In this embodiment, the guide strips 7 are symmetrically arranged and converge in the material feeding direction. The materials of the first screening inclined plate 1, the second screening inclined plate 2, and the third screening inclined plate 3 can be the same or different. In some embodiments, the first screening inclined plate 1, the second screening inclined plate 2, and the third screening inclined plate 3 are made of the same rough surface, such as polypropylene, polyurethane, or rubber. By setting screening inclined plates with higher surface roughness, the sliding resistance is increased, so that irregular blocks and impurities that are not easy to roll can only slide a small distance, thereby achieving screening.
[0038] Preferably, the roughness of the first screening inclined plate 1, the second screening inclined plate 2, and the third screening inclined plate 3 are different, with the roughness of the first screening inclined plate 1 being less than that of the second screening inclined plate 2, and the roughness of the second screening inclined plate 2 being less than that of the third screening inclined plate 3. By setting the first screening inclined plate 1 with a smaller roughness, the mixture can slide down quickly, avoiding accumulation and improving screening efficiency. Flake-shaped materials that are not easy to roll or slide are discharged from the first discharge port 8 due to their lower movement speed, while block-shaped materials and granular materials, due to their higher movement speed and longer movement distance, enter the second screening inclined plate. By setting the second screening inclined plate 2 with a larger roughness, the resistance of the screening inclined plate is increased, further blocking the block-shaped materials in the irregular crushed materials, slowing down the movement speed of the block-shaped materials, and causing them to be discharged from the second discharge port 9. This ensures that the irregular crushed materials will not slide into the third screening inclined plate 3, while the granular materials, due to their higher movement speed and longer movement distance, enter the third screening inclined plate. By setting the third screening inclined plate 3 with the highest roughness, the resistance of the screening inclined plate is further increased, blocking larger metal particles. In this embodiment, the first screening inclined plate 1 is made of stainless steel plate and is mirror polished. The second screening inclined plate 2 is made of polyurethane plate, which has high roughness and is wear-resistant. The third screening inclined plate 3 is made of ceramic composite plate, which has high roughness and is wear-resistant.
[0039] Preferably, the length of the first screening inclined plate 1 is greater than the length of the second screening inclined plate 2, and the length of the second screening inclined plate 2 is greater than the length of the third screening inclined plate 3. To ensure that different materials can be fed through different inlets, the length of the screening inclined plate needs to match its roughness. Since the roughness of the first screening inclined plate 1 is the smallest, its length is the longest, ensuring that sheet-like materials that are not easily rolled or slipped cannot enter the second screening inclined plate. Because the roughness of the second screening inclined plate 2 and the third screening inclined plate 3 increases sequentially, their lengths decrease sequentially, allowing for the screening of the corresponding materials while reducing the overall length of the device, saving costs and reducing the floor space required.
[0040] Preferably, the length of the first screening inclined plate 1 is set to 1.5-2m, the length of the second screening inclined plate 2 is set to 1-1.5m, and the length of the third screening inclined plate 3 is set to 0.5-1m. For example, the length of the first screening inclined plate 1 can be set to 1.5m, 1.6m, 1.7m, 1.8m, 1.9m, or 2m. The length of the second screening inclined plate 2 can be set to 1m, 1.1m, 1.2m, 1.3m, 1.4m, or 1.5m. The length of the third screening inclined plate 3 can be set to 0.5m, 0.6m, 0.7m, 0.8m, 0.9m, or 1m.
[0041] Specifically, the discharge ports include a first discharge port 8, a second discharge port 9, and a third discharge port 10. The first discharge port 8 is located between the first screening inclined plate 1 and the second screening inclined plate 2. The second discharge port 9 is located between the second screening inclined plate 2 and the third screening inclined plate 3. The third discharge port 10 is located at the discharge end of the third screening inclined plate 3. In this embodiment, the first discharge port 8 is the gap between the first screening inclined plate 1 and the second screening inclined plate 2, and the second discharge port 9 is the gap between the second screening inclined plate 2 and the third screening inclined plate 3. The first screening inclined plate 1, the second screening inclined plate 2, and the third screening inclined plate 3 are arranged in a stepped manner, that is, the three screening inclined plates are not located on the same inclined plane, but are three mutually parallel inclined planes, such as... Figure 3 As shown, by setting stepped screening inclined plates, the granular material can slide smoothly down the inclined plates in a parabolic trajectory, and will not fall into the first discharge port 8 and the second discharge port 9, thus further ensuring the screening effect.
[0042] Specifically, a first collecting device 11 is fixed below the first discharge port to collect flaky fragments and larger flaky impurities screened out by the first screening inclined plate 1. A second collecting device 12 is fixed below the second discharge port 9 to collect lumpy fragments screened out by the second screening inclined plate 2. A third collecting device 13 is connected to the third discharge port 10, i.e., the discharge end of the third screening inclined plate 3, to hold the granular material remaining after the mixture has undergone multi-stage screening. By setting up different collecting devices to collect different screened materials, subsequent processing is facilitated.
[0043] In this embodiment, as Figure 1 , Figure 4 and Figure 5 As shown, the first collecting device 11 and the second collecting device 12 are fixed to the bottom of the longitudinal frame 4, and are configured as inclined feeding pipes with an opening at the top, perpendicular to the feeding direction. The third collecting device 13 is configured as an inclined plate, extending along the feeding direction of the third screening inclined plate 3, and fixed to the screening body. One end connects to the feeding section of the third screening inclined plate 3, meaning there is no gap between the third screening inclined plate 3 and the third collecting device 13 along the length direction to prevent particle leakage. The other end is provided with a guide plate 14, which is symmetrically arranged and converges along the feeding direction. To prevent particles from sliding directly out of the third collecting device 13, a baffle 15 is provided on the third collecting device 13. The two sides of the baffle 15 are engaged with the longitudinal frame 4 for easy disassembly. During the screening process, the baffle 15 is inserted to prevent the screened particles from sliding directly out of the third collecting device 13. The baffle 15 is periodically pulled out to collect the particles along the third collecting device 13 into the material cylinder.
[0044] In this embodiment, the first screening inclined plate 1, the second screening inclined plate 2, and the third screening inclined plate 3 are movably connected to the screening body. Each of the three inclined plates has a moving mechanism for adjusting the first discharge port 8 and the second discharge port 9. Since the mixture first passes through the first discharge port 8, to allow more impurities and fragments to enter the first discharge port 8 and improve the screening effect, the first discharge port 8 needs to be larger than the second discharge port 9. That is, the gap between the first screening inclined plate 1 and the second screening inclined plate 2 along the length direction is greater than the gap between the second screening inclined plate 2 and the third screening inclined plate 3 along the length direction. Simultaneously, to ensure that the granular material can pass smoothly through the first discharge port 8 and the second discharge port 9, the first discharge port 8 and the second discharge port 9 should not be too large. Preferably, the gap between the first discharge port 8 and the second discharge port 9 along the length direction is set to 5-10 mm; for example, it can be set to 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm. In this embodiment, as... Figure 4As shown, the longitudinal frame 4 has a first elongated groove 16, a second elongated groove 17, and a third elongated groove 18 respectively positioned relative to the first screening inclined plate 1, the second screening inclined plate 2, and the third screening inclined plate 3. The first screening inclined plate 1 is engaged in the first elongated groove 16 on both sides, allowing it to move along the first elongated groove 16 while maintaining a constant inclination. The second screening inclined plate 2 is engaged in the second elongated groove 17 on both sides, allowing it to move along the second elongated groove 17 while maintaining a constant inclination. The third screening inclined plate 3 is engaged in the third elongated groove 18 on both sides, allowing it to move along the third elongated groove 18 while maintaining a constant inclination. The bottom of each of the first screening inclined plate 1, the second screening inclined plate 2, and the third screening inclined plate 3 is equipped with a moving mechanism, which is located on the longitudinal frame 4.
[0045] Specifically, the moving mechanism includes a moving screw 19, which is mounted on the screening body and connected at its top to the first screening inclined plate 1, the second screening inclined plate 2, or the third screening inclined plate 3. The moving screw 19 can drive the first screening inclined plate 1, the second screening inclined plate 2, or the third screening inclined plate 3 to move along the screening body. In this embodiment, a bottom crossbeam 6 is fixed on the longitudinal frame 4 of the screening body, and the moving screw 19 is arranged parallel to the screening inclined plate. One end of the moving screw 19 is threadedly connected to the bottom crossbeam 6, and the other end is fixed with a connecting piece 20. The top of the connecting piece 20 is fixed with the screening inclined plate. Twisting the moving screw 19 causes it to move along the length direction of the screening inclined plate, thereby moving the screening inclined plate and adjusting the gap along the length direction between the first screening inclined plate 1 and the second screening inclined plate 2, as well as the gap along the length direction between the second screening inclined plate 2 and the third screening inclined plate 3, to adjust the size of the first discharge port 8 and the second discharge port 9.
[0046] Specifically, such as Figure 5 As shown, the adjustment mechanism includes an adjusting screw 21, which is mounted on and movably connected to the support frame 22. The support frame 22 is positioned below the screening body. The top of the adjusting screw 21 is movably connected to the screening body, allowing one end of the screening body to move up and down. In this embodiment, a support frame 22 is provided below the screening body for ease of installation. The longitudinal frame 4 at the feeding end of the screening body is rotatably connected to the support frame 22. A U-shaped support block 23 is fixed to the bottom of the longitudinal frame 4 at the feeding end of the screening body, with the opening of the U-shaped support block 23 facing downwards. A support plate 24 is fixed to the support frame 22 relative to the feeding end. An elongated hole 25 is provided on the support plate 24. The adjusting screw 21 is inserted into the elongated hole 25 and secured to the support plate 24 with a nut 26. A support rod 27 is fixedly connected to the top of the adjusting screw 21. The support rod 27 is secured within the U-shaped support block 23 and movably connected to it. By turning the nut 26, the engagement height between the adjusting screw 21 and the support plate 24 is changed, thereby adjusting the support height of the support rod 27.
[0047] Preferably, the third screening inclined plate 3 is equipped with a magnetic strip. A groove is formed on the third screening inclined plate 3, and the magnetic strip is fixed within the groove to adsorb metal particles from impurities. The magnetic strip is not shown in the figure.
[0048] Specifically, such as Figure 1 As shown, a storage bin 28 is provided at the feed end of the screening body, that is, the storage bin 28 is located close to the first screening inclined plate 1. The storage bin 28 is fixed to the screening body, and the bottom of the storage bin 28 is connected to the first screening inclined plate 1, that is, there is no gap between the bottom of the storage bin 28 and the first screening inclined plate 1 along the length direction to prevent the mixture from leaking out. The bottom of the storage bin 28 extends inclinedly along the length direction of the first screening inclined plate 1 to facilitate the mixture to slide into the first screening inclined plate 1. A partition 29 is fixed inside the storage bin 28 to separate the storage bin 28 from the first screening inclined plate 1. Multiple through slots 30 are opened along the bottom of the partition 29 to connect the first screening inclined plate 1 and the storage bin 28, so that the mixture in the storage bin 28 can enter the first screening inclined plate 1. A guide strip 7 is fixed at the connection between the storage bin 28 and the first screening inclined plate 1 to further facilitate the mixture to enter the first screening inclined plate 1.
[0049] Preferably, a vibrator 31 is fixed to the bottom of the storage silo 28. The vibrator 31 can disperse the accumulated material clumps without damaging the integrity of the granules. Vibration facilitates the entry of the mixture in the storage silo 28 into the first screening inclined plate 1. The specific form of the vibrator 31 is not limited and can be pneumatic, electric, or other types.
[0050] Preferably, a purge port is provided at the bottom of the storage silo 28. The purge port is located on the side of the storage silo 28 and is externally connected to a purge pipeline. The purge gas causes the light impurities in the impurities to float. An exhaust ventilation device is provided above the storage silo 28 to extract and discharge the floating light impurities. The exhaust ventilation device is prior art, and its specific structure and connection method will not be described in detail here. The purge port and the exhaust ventilation device are not shown in the figure.
[0051] Workflow: Based on the friction coefficient and particle size of the granules in the mixture to be screened, the inclination of the screening body, namely the first screening inclined plate 1, the second screening inclined plate 2, and the third screening inclined plate 3, is adjusted using an adjusting mechanism. Tightening the nut 26 on the adjusting mechanism changes the engagement height between the adjusting screw 21 and the support plate 24, thereby adjusting the support height of the support rod 27. This causes the screening body to rotate the first screening inclined plate 1, the second screening inclined plate 2, and the third screening inclined plate 3, achieving overall inclination adjustment. Based on the particle size, the moving screw 19 of the moving mechanism is turned, causing the first screening inclined plate 1 to move along the first long groove 16, the second screening inclined plate 2 along the second long groove 17, and the third screening inclined plate 3 along the third long groove 18. This adjusts the first discharge port 8 and the second discharge port 9, while maintaining the connection between the first screening inclined plate 1 and the storage bin 28, and the connection between the third screening inclined plate 3 and the third collection device 13. The mixture is placed into storage silo 28. The oscillator 31 is manually operated via its control valve to break up any clumps of material. Simultaneously, the purge pipe is opened, and the purge port blows gas into the mixture within storage silo 28, causing light impurities to float. An exhaust system above storage silo 28 extracts and discharges these floating light impurities. The mixture, now free of light impurities, slides through a groove at the bottom of partition 29 into the first screening inclined plate 1 connected to storage silo 28 for further screening. The first screening inclined plate 1 is made of mirror-polished stainless steel, allowing materials that are difficult to slide, including irregular fragments and larger flaky impurities, to be discharged through the first discharge port 8 and collected by the first collection device 11. The remaining mixture continues to slide to the second screening inclined plate 2. The second screening inclined plate 2 is made of a more rough polyurethane board, allowing lumpy fragments to be discharged through the second discharge port and collected by the second collection device 12. The remaining mixture continues to slide to the third screening inclined plate 3. The third screening inclined plate 3 is made of a ceramic composite plate with a rougher surface and is attracted by magnetic strips, causing the metal particles in the mixture to be trapped on the third screening inclined plate 3. The remaining particles continue to slide to the third collection device 13 connected to the third screening inclined plate 3, and are blocked by a baffle 15 to prevent the particles from slipping. The baffle 15 is pulled out, and the particles slide out of the third collection device 13 for collection.
[0052] The advantages and positive effects of this utility model are:
[0053] 1. Based on the differences in shape, density, and friction coefficient of the mixture, a screening inclined plate is used to effectively screen granular materials and irregular crushed materials with similar physical morphology. The structure is simple, the operation is convenient, and the screening efficiency is improved.
[0054] 2. By setting up first, second, and third screening inclined plates with different roughness and lengths, screening of materials with different friction coefficients is achieved. This enables the screening of impurities and irregular fragments in the mixture, ensuring screening effect, improving the utilization rate of granular materials, and the screened granular materials can be used as raw materials for the production of silicon wafers G12R / G12, reducing the material consumption of single crystal furnace crystal pulling, and achieving the overall goal of reducing power consumption.
[0055] 3. By setting up multiple feeding ports and collecting devices, the screened materials can be fed and collected.
[0056] 4. The dynamic adjustment of the screening inclined plate is achieved by setting an adjustment mechanism and a moving mechanism, which is suitable for screening particles with different friction coefficients and particle sizes.
[0057] 5. By blowing and extracting light impurities from the mixture in the storage silo, the cleanliness is improved, eliminating the need for a cleaning process and reducing production costs.
[0058] 6. By setting magnetic strips on the third screening inclined plate, metal particles in the mixture can be adsorbed, further ensuring the screening effect and improving the utilization rate of granular materials.
[0059] The embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. It should be noted that implementations not illustrated or described in the drawings or the main text of the specification are forms known to those skilled in the art and have not been described in detail. Furthermore, the definitions of the various components described above are not limited to the specific structures, shapes, or methods mentioned in the embodiments, and those skilled in the art can easily modify or substitute them.
[0060] The embodiments of this utility model have been described in detail above, but the content described is only a preferred embodiment of this utility model and should not be considered as limiting the scope of implementation of this utility model. All equivalent changes and improvements made in accordance with the claims of this utility model should still fall within the patent coverage of this utility model.
Claims
1. A screening device for a mixture, characterized in that, include: The screening body has multiple screening inclined plates with preset roughness and / or length arranged sequentially at its bottom along the feeding direction, and a feeding port is provided between two adjacent screening inclined plates; An adjustment mechanism, hinged to the screening body, is used to adjust the inclination of the screening body relative to the horizontal plane.
2. The screening device for a mixture according to claim 1, characterized in that, Also includes: A moving mechanism is located between the bottom of the screening inclined plate and the screening body, which drives the screening inclined plate to move relative to the screening body to adjust the size of the discharge port.
3. The screening device for a mixture according to claim 1, characterized in that: The screening inclined plate includes a first screening inclined plate, a second screening inclined plate, and a third screening inclined plate arranged sequentially along the feeding direction, wherein the first screening inclined plate, the second screening inclined plate, and the third screening inclined plate have a preset inclination angle with the screening body.
4. The screening device for a mixture according to claim 3, characterized in that: The roughness of the first screening inclined plate is less than that of the second screening inclined plate, and the roughness of the second screening inclined plate is less than that of the third screening inclined plate.
5. The screening device for a mixture according to claim 4, characterized in that: The length of the first screening inclined plate is greater than the length of the second screening inclined plate, and the length of the second screening inclined plate is greater than the length of the third screening inclined plate.
6. A screening device for a mixture according to any one of claims 3-5, characterized in that: The discharge port includes a first discharge port, a second discharge port, and a third discharge port. The first discharge port is located between the first screening inclined plate and the second screening inclined plate. The second discharge port is located between the second screening inclined plate and the third screening inclined plate. The third discharge port is located at the discharge end of the third screening inclined plate.
7. A screening device for a mixture according to claim 6, characterized in that: The first discharge port is equipped with a first collection device, the second discharge port is equipped with a second collection device, and the third discharge port is equipped with a third collection device.
8. A screening device for a mixture according to any one of claims 1-5 and 7, characterized in that: The adjusting mechanism includes an adjusting screw, which is mounted on a support frame and movably connected to the support frame. The support frame is located below the screening body. The top of the adjusting screw is hinged to the screening body, which can drive one end of the screening body to move up and down.
9. A screening device for a mixture according to any one of claims 1-5 and 7, characterized in that: The screening body has an elongated groove on its side opposite to the screening inclined plate. The screening inclined plate is movably connected to the elongated groove. The moving mechanism includes a moving screw, which is disposed on the screening body and connected to the screening inclined plate at its top. The moving screw can drive the screening inclined plate to move along the elongated groove.
10. A screening device for a mixture according to any one of claims 3-5 and 7, characterized in that: The third screening inclined plate is equipped with magnetic strips.