Sieve plate for screening granular silicon

Abstract

The utility model provides a sieve plate for sieving granular silicon. The sieve plate is characterized in that a sieve plate (1) is arranged on a sieve bottom support (3) for receiving sieved materials; the sieve plate (1) is in a three-dimensional shape with a big lower part and a small upper part and a slope surface; a discharging hole (4) for screening materials is formed in the slope surface of the screen plate (1); the top of the sieve plate (1) is a plane and is provided with an impact groove (2) used for receiving materials to be sieved. While the bearing capacity is guaranteed, the material blocking phenomenon can be reduced, meanwhile, product pollution caused by abrasion of the sieve plate can be avoided, and the service life of the sieve plate is prolonged; the fluidity of the granular silicon on the sieve plate is enhanced, the sieving speed is increased, and the pollution of foreign matters is reduced.

Description

Technical Field

[0001] This utility model relates to a sieve plate, and more particularly to a sieve plate for screening particulate silicon. Background Technology

[0002] This section provides only background information relevant to this disclosure and is not necessarily prior art.

[0003] The silane fluidized bed process for producing granular polycrystalline silicon involves depositing elemental silicon, generated from the cracking of silane gas, onto silicon seed crystals under fluidized conditions. This silicon gradually grows into larger granular silicon particles, which then fall into a collection tank. During production, irregular materials (such as lumps) are removed from the granular silicon using product sieves. However, in actual production, these flat sieves frequently experience material jamming, causing screening to stop. This necessitates stopping the system for inspection, cleaning, and maintaining normal system operation.

[0004] The existing screen plate lacks impact grooves, causing it to be directly subjected to the scouring of silicon material. This can easily lead to the screen plate being scoured through. To maintain its load-bearing strength, the screen plate is thickened. However, when the silicon particles pass through, they are squeezed together, which can easily cause material to get stuck in the screen plate holes. The silicon particles lack fluidity on the flat screen plate. After falling onto the screen plate, the lumpy material can only remain in place, reducing the utilization rate of the screen plate holes and seriously affecting production efficiency.

[0005] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0006] Purpose of the invention: The technical problem to be solved by this utility model is to provide a sieve plate for screening particulate silicon, which addresses the shortcomings of the existing technology.

[0007] To solve the above-mentioned technical problems, this utility model discloses a sieve plate for screening particulate silicon, comprising:

[0008] A screen plate is provided on the screen base for receiving the screened material; the screen plate is a three-dimensional shape with a sloping surface that is larger at the bottom and smaller at the top; the sloping surface of the screen plate is provided with a material discharge hole for screening the material; the top of the screen plate is flat and is provided with an impact groove for receiving the material to be screened.

[0009] Furthermore, the screen base has a concave structure for catching materials rolling off the inclined surface of the screen plate.

[0010] Furthermore, a material retrieval port is provided in the middle of the bottom surface of the screen for retrieving the screened material.

[0011] Furthermore, the sieve plate is frustum-shaped.

[0012] Furthermore, the sieve plate is shaped like a frustum pyramid.

[0013] Furthermore, the feeding hole is set to be vertically downward.

[0014] Furthermore, the opening direction of the feeding hole is set to be perpendicular to the screen plate.

[0015] Furthermore, the impact groove is configured as a circular groove.

[0016] Furthermore, the impact groove is configured as a polygonal groove.

[0017] Furthermore, the sieve plate is integrally molded using polyurethane casting material or spliced ​​from single crystal plates.

[0018] Beneficial effects:

[0019] 1. This utility model can reduce the occurrence of material jamming while ensuring load-bearing capacity.

[0020] 2. This utility model can avoid product contamination caused by wear on the sieve plate and improve the service life of the sieve plate.

[0021] 3. This utility model increases the number of feed holes and enhances the flowability of granular silicon on the sieve plate, thereby improving the screening speed.

[0022] 4. This utility model uses clean and wear-resistant materials (polyurethane casting material or single crystal plate splicing) for processing, which reduces the contamination of foreign objects. Attached Figure Description

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, and the advantages of the present invention in the above and / or other aspects will become clearer.

[0024] Figure 1 This is a top view of the present invention.

[0025] Figure 2 This is a side view of the present invention.

[0026] Figure 3 This is a magnified perspective view of the feed hole.

[0027] In the diagram, 1 is the sieve plate, 2 is the impact groove, 3 is the sieve bottom support, and 4 is the discharge hole. Detailed Implementation

[0028] The design concept of this utility model is as follows:

[0029] 1. Reduce material jamming while ensuring the original load-bearing capacity;

[0030] 2. Extend the service life of the sieve plate;

[0031] 3. Enhances the flowability of particulate silicon on the sieve plate;

[0032] 4. Reduce the frequency of product screening and inspection.

[0033] The technical solution of this utility model is as follows:

[0034] 1. Make the original cylindrical screen plate discharge port into a trumpet shape (larger at the bottom and smaller at the top or "convex" shape) to ensure load-bearing capacity while reducing the occurrence of material jamming;

[0035] 2. An impact groove is designed in the center of the screen plate so that the falling product always impacts the silicon particles in the impact groove, avoiding wear on the screen plate, causing product contamination and improving the service life of the screen plate.

[0036] 3. The original rectangular screen plate was changed to a pyramid-shaped screen plate, which increased the number of feed holes and enhanced the flowability of silicon particles on the screen plate, thereby increasing the screening speed.

[0037] 4. The sieve plate is made of clean and wear-resistant materials (polyurethane casting material or single crystal plate splicing), which reduces the contamination of foreign objects.

[0038] The specific technical solution is as follows:

[0039] A sieve plate for screening particulate silica, such as Figure 1 As shown, it includes: a screen plate 1 with a larger bottom and a smaller top is provided above the screen base 3. The side of the screen plate 1 is sloping, so that the material to be screened can roll off its sloping surface by gravity.

[0040] like Figure 2 As shown, the screen base 3 is designed with a concave structure to receive the material after screening. A material removal port is located in the center of the bottom surface of the screen base 3 for removing the screened material.

[0041] The sieve plate 1 can be set in the shape of a frustum of a cone, or it can be set in the shape of a triangular frustum of a pyramid, a quadrangular frustum of a pyramid, or other multi-faceted frustums.

[0042] The sieve plate 1 is provided with a discharge hole 4 for screening materials.

[0043] like Figure 3 As shown, the direction of the discharge hole 4 is set vertically downwards, or perpendicular to the screen plate 1. The inner diameter of the discharge hole 4 is set according to the screening requirements.

[0044] The top of the screen plate 1 is provided with an impact groove 2, which is aligned with the feed port of the upstream system and is used to receive the material to be screened.

[0045] The impact groove 2 can be set as a circle, triangle, square or other polygon shape.

[0046] The sieve plate 1 can be integrally molded using polyurethane casting material, or it can be spliced ​​from single crystal plates.

[0047] In use, the inner diameter of the discharge hole 4 is set according to the material to be screened, the impact groove 2 is aligned with the discharge port of the upstream system, and the material to be screened is collected; after the material to be screened falls into the impact groove 2, it rolls down along the edge of the impact groove 2 onto the inclined surface of the screen plate 1; after screening through the discharge hole 4, the screen bottom support 3 is used to remove the screened materials separately.

[0048] This utility model provides a concept and method for a sieve plate used for screening particulate silicon. Many methods and approaches exist for implementing this technical solution; the above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. All components not explicitly stated in this embodiment can be implemented using existing technology.

Claims

1. A screen deck for screening of particulate silicon, characterized in that, The utility model relates to a kind of screen bottom support (3) for fetching screen after material, which is characterized by comprising: A screen plate (1) is arranged on the screen bottom support (3) for fetching screen after material; the screen plate (1) has a three-dimensional shape with a slope surface from large at the bottom to small at the top; the slope surface of the screen plate (1) is provided with a discharging hole (4) for screening material; the top of the screen plate (1) is a plane, and is provided with an impact groove (2) for fetching the material to be screened.

2. A screen deck for screening particulate silicon as claimed in claim 1, wherein, The screen bottom support (3) is a concave structure for fetching the material rolling on the slope surface of the screen plate (1).

3. A screen deck for screening particulate silicon as claimed in claim 2, characterised in that, A material fetching port is arranged in the middle of the bottom surface of the screen bottom support (3) for fetching the material screened.

4. A screen deck for screening particulate silicon as claimed in claim 1, wherein, The screen plate (1) is a circular truncated cone.

5. A screen deck for screening particulate silicon as claimed in claim 1, wherein, The screen plate (1) is a prismatic truncated cone.

6. A screen deck for screening particulate silicon as defined in claim 1, wherein, The discharging hole (4) is arranged vertically downward.

7. A screen deck for screening particulate silicon as defined in claim 1, wherein, The discharging hole (4) is arranged vertically to the screen plate (1).

8. A screen deck for screening particulate silicon as defined in claim 1, wherein, The impact groove (2) is arranged in a circular shape.

9. A screen deck for screening particulate silicon as claimed in claim 1, wherein, The impact groove (2) is arranged in a polygonal shape.

10. A screen deck for screening particulate silicon as defined in claim 1, wherein, The screen plate (1) is integrally formed by polyurethane casting material or is spliced by single crystal plate.

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