Polycrystalline silicon powder conveying device

Abstract

The utility model relates to a polycrystalline silicon powder conveying device which is characterized in that an inlet of each screening machine is connected with a polycrystalline silicon powder production line; an inlet of each buffer storage bin is correspondingly connected to an outlet of one screening machine; an inlet of the vacuum screening device is respectively connected with all the buffer storage bins through a first pipeline; an outlet of the vacuum screening device is connected to the vacuum pump through a second pipeline. Silicon materials on a polycrystalline silicon crushing production line can be screened through the multiple screening machines at the same time, then screened powder is moved to the temporary storage bin to be stored, the powder is conveyed into the designated powder screening machine through the abrasion-resistant vacuum conveying pipeline, dust-free uninterrupted conveying of the polycrystalline silicon powder materials is achieved, the screening efficiency of the powder can be greatly improved, and the production efficiency of the polycrystalline silicon crushing production line is improved. And the quality of polycrystalline silicon finished products is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of polycrystalline silicon post-processing, especially to the technical field of polycrystalline silicon powder conveying device. BACKGROUND

[0002] In the traditional polycrystalline silicon production process, there are many problems in the conveying link of polycrystalline silicon powder, including low conveying efficiency, environmental pollution, and large equipment footprint, etc.

[0003] Specifically, when conveying polycrystalline silicon powder, the traditional belt conveying device is prone to cause the powder to fly due to the fine and light characteristics of the powder, resulting in environmental pollution and posing a threat to the health of the workers. In addition, the belt conveying method occupies a large area and it is difficult to avoid the overflow of the powder during the conveying process, which seriously affects the production efficiency and working environment. However, when using vacuum transportation, the nature of polycrystalline silicon powder will cause serious wear and tear of the pipeline. SUMMARY

[0004] The technical problem to be solved by the utility model is how to ensure the efficiency of polycrystalline silicon powder conveying and reduce the pollution caused by leakage while taking into account the wear resistance.

[0005] To solve the above technical problems, the utility model provides a polycrystalline silicon powder conveying device, comprising:

[0006] a plurality of screening machines, the inlet of each screening machine is connected to a polycrystalline silicon powder production line;

[0007] a plurality of buffer hoppers, the inlet of each buffer hopper is connected to the outlet of one screening machine;

[0008] a vacuum screening device, the inlet of the vacuum screening device is connected to all the buffer hoppers through a first pipeline; the outlet of the vacuum screening device is connected to a vacuum pump through a second pipeline; a wear-resistant layer is arranged in the vacuum screening device, the first pipeline, and the second pipeline.

[0009] Further, the vacuum screening device comprises a vacuum material suction machine and Rotap ; the upper end inlet of the vacuum material suction machine is connected to all the buffer hoppers through the first pipeline; the lower end outlet of the vacuum material suction machine is connected to the upper end inlet of the rotary vibration screen.

[0010] Further, the first pipeline and the second pipeline are both made of super wear-resistant ceramic pipelines.

[0011] Further, the vacuum material suction machine is coated with hard tungsten carbide material.

[0012] Further, each of the buffer bins is connected to the first pipeline through a pipe head butterfly valve.

[0013] Further, the screening machine comprises a frame, a screening box and a vibration motor; the frame is arranged on the polysilicon powder production line, the screening box is elastically connected to the frame, and the vibration motor is connected to the screening box.

[0014] Further, the outlet of the screening machine is connected to the inlet of the buffer bin through a hose.

[0015] Further, the buffer bin is provided with an observation window.

[0016] Further, a clasp is arranged at the upper end opening of the buffer bin.

[0017] Further, the first pipeline is also provided with a material suction adapter, and the material suction adapter is located between the butterfly valve and the inlet of the buffer bin.

[0018] Further, each of the material suction adapters is electrically connected to a PLC controller.

[0019] Compared with the prior art, the technical scheme provided by the embodiment of the utility model can at least achieve the following beneficial effects:

[0020] Firstly, the screening machine below which the plurality of buffer bins are installed collects the powder after discharging, and the powder is transported into the vacuum screening device through the vacuum negative pressure pipeline (the first pipeline and the second pipeline), so that the powder transportation efficiency can be greatly improved.

[0021] Secondly, the first pipeline is connected to all the buffer bins, and the butterfly valve is arranged at the connection position, so that the buffer bins can be used to supply the first pipeline in turn, the efficiency is prevented from being reduced due to intermittent feeding, and the plugging caused by simultaneous feeding is also avoided.

[0022] Thirdly, the vacuum screening device is used, the influence of air resistance on fine particles can be reduced, the particles are more easily passed through the screen hole, and the screening accuracy and efficiency are improved.

[0023] Fourthly, the use of the super wear-resistant ceramic pipeline and the tungsten carbide coating reduces the frequency and cost of replacing the pipeline, improves the wear resistance, and reduces the possibility of contamination caused by direct contact between the polysilicon and the metal.

[0024] Fifthly, the use of the first pipeline and the butterfly valve can adjust the flow of the material, and the material suction adapter can effectively prevent gas from leaking from the first pipeline. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings of the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description only relate to some embodiments of the present application and are not a limitation on the present application.

[0026] Figure 1 It is a top view of the polycrystalline silicon powder conveying device of the present application.

[0027] Figure 2 It is a front view of the polycrystalline silicon powder conveying device of the present application.

[0028] Figure 3 It is an enlarged view of A of the present application. Figure 2

[0029] In the drawings:

[0030] 1, screening machine;

[0031] 11, frame;

[0032] 12, sieve box;

[0033] 120, screen;

[0034] 13, vibration motor;

[0035] 2, buffer bin;

[0036] 21, observation window;

[0037] 3, vacuum screening device;

[0038] 31, first pipeline;

[0039] 311, butterfly valve;

[0040] 312, suction adapter;

[0041] 32, second pipeline;

[0042] 33, vacuum suction machine;

[0043] 34, rotary vibration screen;

[0044] 4, vacuum pump;

[0045] 5, hose. DETAILED DESCRIPTION

[0046] ​To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the described embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0047] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a limitation of quantity, but rather indicate the presence of at least one.

[0048] refer to Figures 1 to 3 This embodiment provides a polycrystalline silicon powder conveying device, including:

[0049] Multiple screening machines 1, each screening machine 1 has its inlet connected to a polycrystalline silicon powder production line;

[0050] Multiple buffer hoppers 2, with the inlet of each buffer hopper 2 connected to the outlet of a screening machine 1;

[0051] The vacuum screening device 3 has its inlet connected to all the buffer silos 2 via a first pipe 31; its outlet is connected to the vacuum pump 4 via a second pipe 32. Wear-resistant layers are installed inside the vacuum screening device 3 and the connected first and second pipes 32.

[0052] The utility model discloses a combination use of multiple screening machines 1, buffer bins 2, vacuum screening devices 3 and vacuum pumps 4, realizes the efficient, accurate screening and processing of polysilicon powder. Specifically, after the polysilicon powder is output from the production line, it is first screened in multiple screening machines 1. The screened powder is sent into corresponding buffer bins 2. The buffer bin not only temporarily stores the powder, but also facilitates the orderly processing of the subsequent process. Each buffer bin 2 is connected to the outlet of a screening machine 1, ensuring accurate distribution and storage of the powder. The powder in all buffer bins 2 is concentrated and delivered to the vacuum screening device 3 through the first pipeline 31. Screening in a vacuum environment can effectively reduce powder flying and pollution, while improving screening efficiency and accuracy. The outlet of the vacuum screening device 3 is connected to the vacuum pump 4 through the second pipeline 32. The vacuum pump 4 provides the necessary vacuum environment for the entire system, ensuring the smooth progress of the vacuum screening process. In addition, due to the high hardness of polysilicon powder, the Mohs hardness can reach 7, which puts high requirements on the wear resistance of the pipeline material. In the vacuum conveying system, the friction between the material and the inner wall of the pipeline is particularly intense, so the vacuum screening device 3 and the corresponding pipeline need to be provided with a wear-resistant layer.

[0053] In a preferred embodiment, the wear-resistant treatment of the vacuum screening device 3 and the corresponding pipeline is as follows: the first pipeline 31 and the second pipeline 32 are both made of super wear-resistant ceramic pipelines. Super wear-resistant ceramic pipelines have extremely high wear resistance and can withstand the friction and wear generated during material conveying, prolonging the service life of the pipeline. In addition, the ceramic material itself has high strength and hardness, allowing the pipeline to withstand a large pressure and impact force without deforming or breaking.

[0054] At the same time, the vacuum material suction machine 33 also needs to be coated with tungsten carbide to maintain stable performance in harsh working conditions. In addition, further, the super wear-resistant ceramic pipeline can also be provided with a tungsten carbide coating, providing an additional protective layer and further improving the stability of the pipeline and increasing the service life.

[0055] In a preferred embodiment, as shown in Figure 3 , the screening machine 1 includes a frame 11, a screen box 12 and a vibration motor 13; the frame 11 is arranged on the polysilicon powder production line, the screen box 12 is elastically connected to the frame 11, and the vibration motor 13 is connected to the screen box 12.

[0056] In a preferred embodiment, as shown in Figure 1 , the frame 11 is firmly installed on the polysilicon powder production line, providing stable support for the screening machine 1. It is usually made of solid steel to ensure that it does not sway or shift during screening.

[0057] In a preferred embodiment, as shown in Figure 1As shown, the screen box 12 is connected to the frame 11 by elastic connecting members (such as springs, rubber pads, etc.); thus, when the screen box 12 is driven by the vibration motor 13 to vibrate efficiently, the direct impact on the frame 11 is reduced.

[0058] In a preferred embodiment, the screen box 12 is internally provided with a screen mesh, the aperture of which is selected according to the required screening particle size. When the vibration motor 13 is started, the vibration motor 13 generates periodic vibrations through the eccentric block inside it, so that the screen box 12 performs complex vibrations up and down, forward and backward, so that the polysilicon powder is uniformly distributed on the screen mesh and quickly passes through, thereby achieving screening.

[0059] In a preferred embodiment, the outlet of the screening machine 1 is connected to the inlet of the buffer bin 2 through a hose 5. The hose 5 generally has good sealing performance, which can effectively prevent the material from leaking or flying during the transmission process, thereby maintaining the cleanliness of the production environment and the integrity of the material.

[0060] In a preferred embodiment, as shown, Figure 2 The vacuum screening device 3 includes a vacuum material suction machine 33 and a rotary vibration screen 34; the upper end inlet of the vacuum material suction machine 33 is connected to all the buffer bins 2 through a first pipeline 31; and the lower end outlet of the vacuum material suction machine 33 is connected to the upper end inlet of the rotary vibration screen 34. Specifically, the upper end inlet of the vacuum material suction machine 33 is connected to all the buffer bins 2 through the first pipeline 31. This design allows the vacuum material suction machine 33 to take out from multiple buffer bins 2 or one buffer bin 2, thereby improving the flexibility and efficiency of material processing.

[0061] In a preferred embodiment, each buffer bin 2 is connected to the first pipeline 31 through a butterfly valve 311. By setting the control part to control the opening and closing of the butterfly valve installed at the front end of the buffer bin 2, the polysilicon powder in all the buffer bins 2 can be moved to the vacuum material suction machine 33 through the first pipeline 31 in turn, and then directly connected to the rotary vibration screen 34 through the double-disc valve ash unloading device arranged at the bottom of the vacuum material suction machine 33 for screening.

[0062] In a preferred embodiment, a material suction adapter 312 is further arranged on the first pipeline 31, and the material suction adapter 312 is located between the butterfly valve 311 connected to each buffer bin 2 and the inlet of the material suction adapter 312. The material suction adapter 312 functions to smoothly feed the vacuum conveying system and adjust the air intake to facilitate the control of the material flow state.

[0063] Further, the material suction adapter 312 can function to control the turn-on and turn-off of the buffer bin 2 in turn; specifically, each material suction adapter 312 is electrically connected to a PLC controller; so that the PLC controller realizes the uninterrupted and sequential suction of each buffer bin 2.

[0064] In a preferred embodiment, the buffer bin 2 is provided with an observation window 21. The observation window 21 is designed such that the operator can directly observe the material condition inside the buffer bin 2 without opening the bin cover or performing other complicated operations. Through the observation window 21, the operator can clearly see the inventory, flow state of the material and whether there is a blockage or abnormal phenomenon, so as to take corresponding processing measures in time.

[0065] In a preferred embodiment, a snap ring 61 is arranged at the upper opening of the buffer bin 2 to maintain the sealing of the bin and prevent the leakage of the material, and also facilitate the maintenance and cleaning of the bin.

[0066] In a preferred embodiment, a chuck 62 is arranged between the first pipeline 31 and the buffer bin 2. The chuck 62 fixes the position of the pipeline and prevents the pipeline from being displaced due to vibration or pressure change. In addition, the chuck 62 facilitates the installation and maintenance of the pipeline, and the chuck can be designed to be quickly disassembled.

[0067] The above description is only exemplary embodiments of the present application, and is not intended to limit the protection scope of the present application. The protection scope of the present application is determined by the appended claims.

Claims

1. A polysilicon powder delivery apparatus, characterized by, The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device.

2. A polysilicon powder delivery apparatus as defined in claim 1, wherein The vacuum screening device comprises a vacuum suction machine and The application relates to a polysilicon powder screening device. ; the upper end inlet of the vacuum suction machine is connected to all the buffer hoppers through the first pipeline; and the lower end outlet of the vacuum suction machine is connected to the upper end inlet of the rotary vibrating screen.

3. The polycrystalline silicon powder delivery apparatus of claim 1, wherein, The application relates to a polysilicon powder screening device.

4. A polysilicon powder delivery apparatus as defined in claim 2, wherein, The application relates to a polysilicon powder screening device.

5. A polysilicon powder delivery apparatus as defined in claim 4, wherein, The application relates to a polysilicon powder screening device.

6. A polysilicon powder delivery apparatus as defined in claim 4, wherein, The application relates to a polysilicon powder screening device.

7. The polycrystalline silicon powder delivery apparatus of claim 1, wherein, The application relates to a polysilicon powder screening device.

8. The polycrystalline silicon powder delivery apparatus of claim 1, wherein, The application relates to a polysilicon powder screening device.

9. The polycrystalline silicon powder delivery apparatus of claim 1, wherein, The application relates to a polysilicon powder screening device.

10. The polycrystalline silicon powder delivery apparatus of claim 5, wherein, The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device. The application relates to a polysilicon powder screening device.

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