Dust removal device for magnetic separator

Abstract

The utility model relates to the technical field of polycrystalline silicon treatment, in particular to a dust removal device for a magnetic separator, which comprises a negative pressure dust extraction mechanism and a dust extraction pipe, a belt of the magnetic separator is enclosed to form an operation space; one end of the dust suction pipe is communicated with the negative pressure dust suction mechanism, and the other end of the dust suction pipe extends into the operation space and is communicated with the operation space. By means of the dust removal device, magnetic silicon powder in the magnetic separator can be effectively removed, and the influence of the magnetic silicon powder on the adsorption effect of the strong magnetic roller is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of polysilicon processing, in particular to a dust removal device for a magnetic separator. Background Technique

[0002] In the production of polysilicon, it is often necessary to use a crusher to crush silicon materials for the next step of production. However, the crusher has a main body with an iron structure, and non-silicon substances are extremely likely to be generated during the crushing process, such as dropped alloy plates, bolts, nuts, etc. The dropped non-silicon substances will be mixed in the crushed silicon material products, affecting the silicon material products. To solve the above problems, the existing common method is to add the crushed silicon material products into a magnetic separator to screen out the iron non-silicon substances mixed in the crushed silicon materials, so that the silicon material products do not contain iron non-silicon substances.

[0003] Existing magnetic separators generally include a belt, a roller, and a frame. The roller is installed on the frame, and the belt is wound around the roller; one of the rollers is a strong magnetic roller. In the prior art, generally, a discharging tooling is added at the position of the belt discharging port at the top of the magnetic separator. This structure is similar to a trapezoidal funnel, with a dust removal docking air duct of about DN100 and a length of 100 mm to 200 mm on the front and back, and finally directly connected to a dust removal hose. There is an inclined hole filtering structure on the discharging port for extracting silicon powder less than 1 mm. During operation, the silicon material falls from the belt into the funnel, and the silicon powder floating in the air and the silicon powder containing silicon material inclusions pass through the filtering holes into the dust removal system. Also, in the prior art, generally, a storage box is arranged below the strong magnetic roller of the magnetic separator, and the iron non-silicon substances are adsorbed by the strong magnetic roller and fall into the storage box below to complete the collection.

[0004] For example, the Chinese invention utility model document with the publication number of CN218573917 and the publication date of March 7, 2023, proposed in the prior art, and the Chinese utility model patent document with the publication number of CN218945306 and the publication date of May 2, 2023, proposed in the prior art.

[0005] The negative pressure dust suction structure in the above technical solutions can only remove the dust generated during the belt feeding process. Since the belt is a long-time running component and cannot be completely sealed with the frame, in order to keep the belt rotating normally, a certain movement gap is reserved. It is because of this running gap that some magnetic silicon powder will enter the running space formed by the upper and lower layers of the belt of the magnetic separator. This part of the magnetic silicon powder will not enter the storage box below the magnetic roller, but will adhere to the strong magnetic roller under the adsorption of the strong magnetic roller. After reaching a certain thickness, it will affect the function of the strong magnetic roller to remove the surface metal of the silicon material. Summary of the Invention

[0006] To solve the above technical problems, the present utility model proposes a dust removal device for a magnetic separator, which can effectively remove the magnetic silicon powder in the magnetic separator and avoid affecting the adsorption effect of the strong magnetic drum.

[0007] The present utility model is realized by adopting the following technical solutions:

[0008] A dust removal device for a magnetic separator includes a negative pressure dust extraction mechanism and a dust extraction pipe; the belt of the magnetic separator encloses a running space; one end of the dust extraction pipe is connected to the negative pressure dust extraction mechanism in a communicating manner, and the other end extends into the running space and is in communication with the running space.

[0009] The dust extraction pipe is in a hollow flat shape.

[0010] The dust extraction pipe is also provided with long strip holes communicating with the running space.

[0011] A reducing communicating pipe is also provided between the negative pressure dust extraction mechanism and the dust extraction pipe. Along the direction from the negative pressure dust extraction mechanism to the dust extraction pipe, the inner diameter of the communicating pipe decreases in sequence.

[0012] The communicating pipe and the dust extraction pipe are connected by a hoop.

[0013] Both ends of the dust extraction pipe are respectively connected to the frame of the magnetic separator through fixing parts.

[0014] The fixing part includes a clamping plate and a mounting plate connected to the frame; the clamping plate is provided with a groove matching the dust extraction pipe; the clamping plate is connected to the mounting plate for fixing the dust extraction pipe on the mounting plate.

[0015] The mounting plate is in an L shape.

[0016] The number of the dust removal devices is at least two, which are arranged at intervals respectively.

[0017] Compared with the prior art, the beneficial effects of the present utility model are shown in:

[0018] 1. The present utility model breaks the conventional idea and installs the structure of the conventional dust removal device in the belt conveying area of the magnetic separator, so that the dust extraction pipe of the dust removal device extends into the running space. The negative pressure dust extraction mechanism generates negative pressure. Under the action of the negative pressure, the dust extraction pipe extracts the magnetic silicon powder entering the running space of the magnetic separator from the running gap, avoiding the magnetic silicon powder from adhering to the strong magnetic drum under the adsorption of the strong magnetic drum and avoiding affecting the function of the strong magnetic drum to remove the metal on the surface of the silicon material.

[0019] Meanwhile, when the magnetic separator is running, the bearings will wear out, and the belt and the roller will also wear against each other. Wear will generate impurities, and the metal impurities in these impurities are also easily adsorbed by the strong magnetic roller and can easily affect the operating stability of components such as the roller and bearings. The dust extraction pipe in the present utility model can also forcibly extract this part of the impurities to improve the operating stability of the magnetic separator.

[0020] 2. In the present utility model, the structure of the dust extraction pipe is improved so that the dust extraction pipe is in a hollow flat shape, which is more suitable for a limited operating space and can effectively avoid scratching.

[0021] 3. The dust extraction pipe is also provided with long strip holes communicating with the operating space, and the area and range of negative pressure dust extraction are wider, and the dust extraction is more comprehensive.

[0022] 4. A reducing connecting pipe is also provided between the negative pressure dust extraction mechanism and the dust extraction pipe. The design of this connecting pipe can increase the air volume per unit area of the dust extraction pipe and improve its adsorption force.

[0023] 5. Since the connecting pipe is of variable diameter and the connecting pipe and the dust extraction pipe are connected by a hoop, the hoop can be tightened more tightly, which can improve the anti-detachment effect of the dust extraction pipe.

[0024] 6. Both ends of the dust extraction pipe are respectively connected to the frame of the magnetic separator through fixing parts, so that the structure of the dust extraction pipe is more stable and can avoid displacement or large jitter, which affects the operation of the magnetic separator.

[0025] 7. The structure of the fixing part is simple, and the installation and disassembly are also more convenient.

[0026] 8. The number of the dust removal devices is at least two, which are arranged at intervals respectively, facilitating the reasonable arrangement of the positions of the dust removal devices and making the dust removal effect better. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The following will further describe the present utility model in detail in conjunction with the specification drawings and specific embodiments, where:

[0028] Figure 1 is a schematic connection structure diagram of the dust extraction pipe and the connecting pipe in the present utility model;

[0029] Figure 2 is a schematic cross-sectional structure diagram of the dust extraction pipe and the connecting pipe in the present utility model;

[0030] Figure 3 is an installation schematic diagram of the present utility model;

[0031] Figure 4 is an enlarged structure schematic diagram of area A in the present utility model;

[0032] Markings in the figure:

[0033] 1. Dust extraction pipe, 2. Long strip holes, 3. Connecting pipe, 4. Frame, 5. Fixing piece. Specific implementation manners

[0034] Embodiment 1

[0035] As a basic implementation manner of the present utility model, the present utility model includes a dust removal device for a magnetic separator, including a negative pressure dust extraction mechanism and a dust extraction pipe 1. The belt of the magnetic separator encloses a running space. Specifically, the running space can be enclosed by the upper and lower layers of belts of the magnetic separator. One end of the dust extraction pipe 1 is communicated with the negative pressure dust extraction mechanism, and the other end extends into the running space and is communicated with the running space. The negative pressure dust extraction mechanism generates negative pressure, and under the action of the negative pressure, the dust extraction pipe 1 extracts impurities in the running space.

[0036] Embodiment 2

[0037] As a preferred implementation manner of the present utility model, the present utility model includes a dust removal device for a magnetic separator, including a negative pressure dust extraction mechanism and a dust extraction pipe 1. Among them, the magnetic separator includes a belt, a roller and a frame 4, and the frame 4 includes two side plates. Both ends of the roller are respectively installed on the two side plates, and the belt is wound around the roller. The upper and lower layers of belts and the two side plates jointly enclose a running space.

[0038] The dust extraction pipe 1 can be in a hollow flat shape. One end of the dust extraction pipe 1 is communicated with the negative pressure dust extraction mechanism, and the other end passes through the side plate, extends into the running space and is communicated with the running space. In addition to the through holes at the end of the dust extraction pipe 1, long strip holes 2 communicated with the running space can also be provided on the dust extraction pipe 1 to expand the adsorption range and make the adsorption more comprehensive.

[0039] Embodiment 3

[0040] As another preferred implementation manner of the present utility model, the present utility model includes a dust removal device for a magnetic separator, including a negative pressure dust extraction mechanism and a dust extraction pipe 1. The belt of the magnetic separator encloses a running space. One end of the dust extraction pipe 1 is communicated with the negative pressure dust extraction mechanism, and the other end extends into the running space and is communicated with the running space.

[0041] Preferably, a reducing connecting pipe 3 is further provided between the negative pressure dust extraction mechanism and the dust extraction pipe 1. Among them, the connecting pipe 3 can be a stepped pipe, and along the direction from the negative pressure dust extraction mechanism to the dust extraction pipe 1, the inner diameter of the connecting pipe 3 gradually decreases.

[0042] Further, the number of the dust removal devices may be three, which are arranged at intervals along the conveying direction of the magnetic separator. Preferably, in order to improve the stability of the dust extraction pipe 1 during operation, both ends of the dust extraction pipe 1 are respectively connected to the frame 4 of the magnetic separator through fixing members 5. Specifically, an installation plate may be provided on the dust extraction pipe 1, and the installation plate may be connected to the frame 4 through components such as bolts.

[0043] Embodiment 4

[0044] As the best implementation mode of the present utility model, the present utility model includes a dust removal device for a magnetic separator. Referring to the attached Figure 1 and the attached Figure 2 description, it includes a negative pressure dust extraction mechanism, a connecting pipe 3 and a dust extraction pipe 1 connected in sequence. Among them, the negative pressure dust extraction mechanism can adopt conventional technical means in the art. For example, the negative pressure dust extraction mechanism can be a negative pressure fan, etc.

[0045] The magnetic separator may include a frame 4, a first roller, a second roller and a belt. The frame 4 includes a support frame and two side plates. Both ends of the first roller and the second roller are respectively installed on the two side plates, and the belt is wound around the first roller and the second roller. The two side plates and the upper and lower layers of the belt jointly enclose an operating space. Among them, the first roller is a strong magnetic roller and is arranged at the discharge end of the magnetic separator.

[0046] Since the operating space is relatively narrow, the dust extraction pipe 1 is in a hollow flat shape, and the thickness of the dust extraction pipe 1 can be appropriately adjusted according to the distance between the upper and lower layers of the belt. Specifically, the upper and lower surfaces of the dust extraction pipe 1 can maintain a distance of more than 20 mm from the belt to avoid the situation of the belt rubbing against the dust extraction pipe 1.

[0047] The side plate is provided with a first through hole for the dust extraction pipe 1 to pass through, and both ends of the dust extraction pipe 1 can be respectively located outside the side plate. The dust extraction pipe 1 is provided with a long hole 2 communicating with the operating space. Among them, the long hole 2 can be arranged along the axial direction of the first roller and the second roller.

[0048] In order to improve the stability of the dust extraction pipe 1 during operation, both ends of the dust extraction pipe 1 can be connected to the side plate of the magnetic separator through fixing members 5. The fixing member 5 may include an installation plate and a fixing bolt, and the installation plate is provided with a second through hole for the dust extraction pipe 1 to pass through. The installation plate is located outside the side plate and is connected to the side plate through the fixing bolt.

[0049] Further, in order to improve the convenience of installation and disassembly of the dust extraction pipe 1 and enhance the positioning effect of the dust extraction pipe 1 to prevent deviation during operation, the fixing member 5 further includes a clamping plate. A groove matching the dust extraction pipe 1 is provided on the clamping plate. Further still, the mounting plate can be L-shaped, including a vertical plate and a horizontal plate. The second through hole can be provided on the vertical plate and penetrate through the end face of the vertical plate on the side close to the horizontal plate, so that when the dust extraction pipe 1 passes through the second through hole, it can be directly placed on the horizontal plate. During use, after the groove of the clamping plate clamps the dust extraction pipe 1, the clamping plate and the horizontal plate are connected together by bolts, and then the vertical plate and the side plate are connected by bolts.

[0050] Further still, the connecting pipe 3 is of a reduced diameter shape. Specifically, the connecting pipe 3 can include several stepped surfaces. Along the direction from the negative pressure dust extraction mechanism to the dust extraction pipe 1, the inner diameter of the stepped surfaces decreases in sequence. Moreover, an inclined transition surface is provided between adjacent two stepped surfaces. Through the structural design of the connecting pipe 3, the air volume per unit area at the long strip hole 2 can be increased, and the adsorption force can be enhanced. And because the connecting pipe 3 is of a reduced diameter shape, when the connecting pipe 3 and the dust extraction pipe 1 are connected by a stainless steel hoop, the hoop can be tightened more tightly, the connection is more stable, and the anti-detachment effect of the dust extraction pipe 1 is better.

[0051] The other end of the connecting pipe 3 can be connected to the negative pressure dust extraction mechanism through a hose. Preferably, referring to the attached Figure 3 and the attached Figure 4 to the specification, two dust removal devices are configured on this magnetic separator. The dust extraction pipe 1 of one dust removal device is installed near the first roller, i.e., the strong magnetic roller, which is convenient for adsorbing the mixed non-silicon and the magnetic substances attracted by the strong magnetic roller. The dust extraction pipe 1 of the other dust removal device is installed near the second roller and is used for adsorbing the non-silicon generated by the friction between the belt and the roller during operation. The two dust removal devices can share the same negative pressure dust extraction mechanism or use a negative pressure dust extraction mechanism separately.

[0052] In summary, after those of ordinary skill in the art read the documents of this utility model, all other corresponding transformation schemes made without creative mental labor according to the technical solutions and technical concepts of this utility model shall fall within the scope protected by this utility model.

Claims

1. A dust removal device for a magnetic separator, characterized in that: It includes a negative pressure dust extraction mechanism and a dust extraction pipe (1); the belt of the magnetic separator encloses to form an operating space; one end of the dust extraction pipe (1) is connected to the negative pressure dust extraction mechanism, and the other end extends into the operating space and is communicated with the operating space.

2. The dust removal device for a magnetic separator according to claim 1, wherein: The dust extraction pipe (1) is in a hollow flat shape.

3. The dust removal device for a magnetic separator according to claim 2, characterized in that: The dust extraction pipe (1) is also provided with a long strip hole (2) communicated with the operating space.

4. The dust removal device for a magnetic separator according to claim 1 or 3, characterized in that: A reducing connecting pipe (3) is also arranged between the negative pressure dust extraction mechanism and the dust extraction pipe (1). Along the direction from the negative pressure dust extraction mechanism to the dust extraction pipe (1), the inner diameter of the connecting pipe (3) decreases in sequence.

5. The dust removal device for a magnetic separator according to claim 4, characterized in that: The connecting pipe (3) and the dust extraction pipe (1) are connected by a hoop.

6. The dust removal device for a magnetic separator according to claim 4, characterized in that: Both ends of the dust extraction pipe (1) are respectively connected to the frame (4) of the magnetic separator through fixing parts (5).

7. The dust removal device for a magnetic separator according to claim 6, wherein: The fixing part (5) includes a clamping plate and a mounting plate connected to the frame (4); the clamping plate is provided with a groove matching with the dust extraction pipe (1); the clamping plate is connected to the mounting plate for fixing the dust extraction pipe (1) on the mounting plate.

8. The dust removal device for a magnetic separator according to claim 7, wherein: The mounting plate is in an L shape.

9. The dust removal device for a magnetic separator according to claim 7, characterized in that: The number of the dust removal devices is at least two, which are arranged at intervals respectively.

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