Polycrystalline silicon screening device

Abstract

The utility model belongs to the technical field of polycrystalline silicon production. In view of the problem that an existing screening machine cannot completely sort out re-fed materials in polycrystalline silicon materials, the utility model provides a polycrystalline silicon screening device which comprises a first screening assembly and a second screening assembly. Wherein the first screening assembly is provided with three stages of screening mechanisms so as to sort polycrystalline silicon materials into large materials, re-fed materials and small materials which are different in size grade; the second screening assembly is connected with the large material discharging end of the first screening assembly so as to conduct secondary screening on the large materials. According to the screening device, re-fed materials mixed in polycrystalline silicon materials with large sizes can be sorted out, the quality improving effect is achieved, and therefore economic benefits and competitiveness of companies can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of polysilicon production, and in particular relates to a polysilicon screening device. Background Art

[0002] Polycrystalline silicon is a form of elemental silicon. When molten elemental silicon solidifies under supercooling conditions, silicon atoms are arranged into many crystal nuclei in the form of diamond lattices. If these crystal nuclei grow into grains with different crystal plane orientations, these grains will combine and crystallize into polycrystalline silicon.

[0003] During the mechanical crushing process of polysilicon production, screening machines are needed to screen and classify silicon materials of different specifications and sizes. Polysilicon with a linear size between 5mm and 50mm can be sold directly as re-investment material, with the highest price.

[0004] At present, screening machines are usually unable to completely and thoroughly screen out re-invested materials during the screening process. Polysilicon with larger linear sizes is usually mixed with small-sized re-invested materials. If they are sold directly as primary materials, their value will be low, which is not conducive to competition with other companies. Utility Model Content

[0005] In view of the problem that existing screening machines cannot completely separate the re-injected materials in polysilicon materials, one of the purposes of the utility model is to provide a polysilicon screening device, which can separate the re-injected materials mixed in larger polysilicon materials, thereby achieving a quality improvement effect, which is beneficial to improving the economic benefits and the company's competitiveness.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A polysilicon screening device comprises a first screening component and a second screening component.

[0008] Among them, the first screening component has a three-stage screening mechanism to sort the polysilicon material into large materials, re-injected materials and small materials of different size grades; the second screening component is connected to the large material discharge end of the first screening component to perform secondary screening on the large material.

[0009] In one of the technical solutions disclosed in the present utility model, the first screening assembly includes a first bracket; a first box body, which is installed on the first bracket.

[0010] Wherein, the three-stage screening mechanism includes three screen plates arranged in sequence from top to bottom in the first box; and the screen plates are inclined downward from the feed end of the first box to the discharge end of the first box.

[0011] In one of the technical solutions disclosed in the present utility model, a vibrating feeder is provided at the feeding end of the first box.

[0012] In one of the technical solutions disclosed in the utility model, a vibration mechanism is provided on the first box body to drive the three-stage screening mechanism to vibrate and screen the polysilicon material.

[0013] In one of the technical solutions disclosed in the present utility model, the sieve holes of the first-stage sieve plate of the three-stage screening mechanism are square, and the sieve holes of the second-stage sieve plate and the third-stage sieve plate are circular.

[0014] In one of the technical solutions disclosed in the present utility model, the second screening assembly includes a second bracket; a second box body, which is arranged on the second bracket; a screen, which is arranged on the second box body; and the screen is inclined downward from the feed end of the second box body to the discharge end of the second box body.

[0015] In one of the technical solutions disclosed in the present utility model, a second vibrating feeder is provided at the feeding end of the second box body.

[0016] In one of the technical solutions disclosed in the present utility model, a second vibration mechanism is provided on the second box body to drive the screen to vibrate and screen the polysilicon material.

[0017] In one of the technical solutions disclosed in the present utility model, the mesh holes of the sieve are square.

[0018] In one of the technical solutions disclosed in the present utility model, a dust removal component is also included; wherein, a dust removal port is provided on the first box body and / or the second box body; and the dust removal port is connected to the dust removal component.

[0019] From the above description, it can be seen that the beneficial effects of the utility model are:

[0020] When screening polysilicon materials, the polysilicon materials are fed into the first box through the first vibrating feeder. After being screened by the first-stage sieve plate, materials with linear dimensions larger than the sieve holes of the first-stage sieve plate move along the first-stage sieve plate to the large material discharge end and fall into the second vibrating feeder. Through the vibration of the second vibrating feeder, the materials are evenly fed into the second box. Through the action of the screen, the re-feed materials with linear dimensions smaller than the sieve holes mixed in the large materials are screened and sorted for the second time, thereby obtaining as much re-feed materials as possible, which is beneficial to improving economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a structural schematic diagram of the utility model.

[0023] Figure 2 It is a schematic diagram of the three-stage screening structure of the first screening component of the utility model.

[0024] Figure markings: 1-first screening component; 11-first bracket; 12-first box; 13-three-stage screening mechanism; 14-vibration feeding mechanism; 15-vibration mechanism; 2-second screening component; 21-second bracket; 22-second box; 24-vibration feeding mechanism; 25-vibration mechanism; 3-dust removal port. DETAILED DESCRIPTION

[0025] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0030] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0031] The utility model discloses a polysilicon screening device, the structure of which is shown in the attached figure. Figure 1 and attached Figure 2 As shown, it includes a first screening assembly 1 and a second screening assembly 2 .

[0032] Specifically, the first screening assembly 1 has a first bracket 11, a first box body 12 installed on the first bracket 11, a three-stage screening mechanism 13 arranged in the first box body 12 for sorting polysilicon into large materials, re-feeding materials and small materials, a first vibrating feeder 14 arranged at the feeding end of the first box body 12, and a first vibration mechanism 15 connected to the first box body 12 to drive the first box body 12 to vibrate.

[0033] The three-stage screening mechanism 13 includes three screen plates sequentially arranged in the first box body 12 from top to bottom; and the three screen plates are inclined downward from the feed end to the discharge end of the first box body 12 to facilitate automatic discharge of materials under vibration.

[0034] The second screening component 2 is connected to the large material discharge end of the first box 12 to perform secondary screening on the large material sorted out by the first screening component 1; the second screening component 2 includes a second bracket 21, a second box 22 arranged on the second bracket 21, a screen arranged in the second box 22 to sort out the re-feed material in the large material, a second vibrating feeder 24 arranged at the feeding end of the second box 22, and a second vibration mechanism 25 connected to the second box 22 to drive the second box 22 to vibrate.

[0035] The screen is tilted downward from the feed end to the discharge end of the second box body 22 to facilitate discharge.

[0036] In the actual working process, the crushed polysilicon is sorted into large materials, re-injected materials and small materials of different size grades by the first screening component 1. Among them, the large materials with larger size grades are screened and sorted for the second time by the second screening component 2 to obtain as much re-injected materials as possible, which is beneficial to improve economic benefits.

[0037] In some embodiments, a dust removal assembly is also included (not shown in the drawings). The first box 12 and the second box 22 are both provided with a dust removal port 3 connected to the dust removal assembly, so as to remove the dust generated during the screening process and reduce the pollution of powder and silicon material.

[0038] As a specific implementation of the above embodiment, the first-stage sieve plate of the three-stage screening mechanism 13 has a square sieve hole with a size of 30mm*38mm; the second-stage sieve plate and the third-stage sieve plate have round sieve holes with diameters of 6mm and 1mm respectively. The sieve holes of the sieve are square with a size of 24mm*30mm. The large material is screened with a square hole sieve, which is conducive to improving the screening rate and is not easy to block the holes.

[0039] It can be seen from the above description that the working principle and beneficial effects of the embodiment of the utility model are:

[0040] When screening polysilicon materials, the polysilicon materials are fed into the first box 12 through the first vibrating feeder 15. After being screened by the first-stage sieve plate, materials with linear dimensions larger than the sieve holes of the first-stage sieve plate move along the first-stage sieve plate to the large material discharge end and fall into the second vibrating feeder 25. Through the vibration of the second vibrating feeder 2, the materials are evenly fed into the second box 22. Through the action of the screen, the re-feed materials with linear dimensions smaller than the sieve holes mixed in the large materials are screened and sorted for the second time, thereby obtaining as much re-feed materials as possible, which is beneficial to improving economic benefits.

[0041] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A polysilicon screening device, characterized in that: include: a first screening assembly and a second screening assembly; Wherein, the first screening component has a three-stage screening mechanism to sort the polysilicon material into large materials, re-invested materials and small materials of different size grades; The second screening component is connected to the large material discharge end of the first screening component to perform secondary screening on the large material.

2. The polysilicon screening device according to claim 1, characterized in that: The first screening assembly comprises: First bracket; A first box body is mounted on the first bracket; Wherein, the three-stage screening mechanism includes three screen plates arranged in sequence from top to bottom in the first box; and the screen plates are inclined downward from the feed end of the first box to the discharge end of the first box.

3. The polysilicon screening device according to claim 2, characterized in that: A vibrating feeder is provided at the feeding end of the first box.

4. The polysilicon screening device according to claim 2 or 3, characterized in that: The first box body is provided with a vibration mechanism to drive the three-stage screening mechanism to vibrate and screen the polysilicon material.

5. The polysilicon screening device according to claim 2, characterized in that: The sieve holes of the first-stage sieve plate of the three-stage sieve mechanism are square, and the sieve holes of the second-stage sieve plate and the third-stage sieve plate are circular.

6. The polysilicon screening device according to claim 2, characterized in that: The second screening assembly comprises: Second bracket; A second box body is arranged on the second bracket; The screen is arranged on the second box body; and the screen is inclined downward from the feeding end of the second box body to the discharging end of the second box body.

7. The polysilicon screening device according to claim 6, characterized in that: A second vibrating feeder is provided at the feeding end of the second box.

8. The polysilicon screening device according to claim 6, characterized in that: The second box body is provided with a second vibration mechanism to drive the screen to vibrate and screen the polysilicon material.

9. The polysilicon screening device according to claim 6, characterized in that: The mesh openings of the sieve are square.

10. The polysilicon screening device according to claim 6, characterized in that: It also includes a dust removal component; wherein, a dust removal port is provided on the first box body and / or the second box body; and the dust removal port is connected to the dust removal component.

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