A chain control system for polysilicon material dust removal

Abstract

The utility model discloses a chain control system for dust removal of polysilicon materials, belonging to the technical field of polysilicon dust removal. It includes a pneumatic conveying system pipeline and a plurality of points to be cleaned connected to the pneumatic conveying system pipeline, each point to be cleaned is provided with a material level monitor, and each pipeline connected to the pneumatic conveying system pipeline of the point to be cleaned is provided with an electric control valve chained with the corresponding material level monitor, and the material level monitor and the electric control valve in each point to be cleaned are electrically connected to a controller for controlling the start and stop of the pneumatic conveying system. The utility model can realize the chain control of dust removal of polysilicon materials, and the points to be cleaned connected to the pneumatic conveying system can be controlled individually, thereby controlling the number of points for cleaning dust each time, requiring a small air volume and a small pipeline for the pneumatic conveying system, and reducing the construction cost.

Description

Technical Field

[0001] The utility model relates to the field of dust removal, in particular to a chain control system for dust removal of polysilicon materials. Background Art

[0002] The project requires a pneumatic conveying system to clean, collect and reuse the silicon dust in the lower cone (i.e., ash bin) of each dust removal device to save the cost of purchasing raw materials. Due to the large number of dust removal devices and their scattered layout, the pneumatic conveying pipeline has long and numerous branches. In order to smoothly transport silicon dust, the wind speed in the pneumatic conveying pipeline is relatively high. If the lower cones of each dust collector are cleaned at the same time, the air volume required by the pneumatic conveying system is the sum of the air volumes required at all cleaning points, resulting in a larger diameter of the main pipeline, and the air volume of the selected Roots vacuum pump will also be higher, increasing the investment and construction costs.

[0003] At the same time, the existing control system does not control the ash discharge valve. When the material level monitoring meter in the buffer silo gives a high material level alarm, if the pneumatic conveying system fails or the cleaning point is in a "cleaning queue", the ash discharge valve still continuously discharges silicon material dust into the buffer silo, causing the dust in the buffer silo to accumulate more and more, and become more and more crowded, resulting in two unfavorable situations: 1. The buffer silo is full of dense silicon material dust, and the ash discharge valve cannot discharge dust into the buffer silo. The dust will gather in the ash discharge valve body, and grind the valve body as the ash discharge valve rotates, accelerating the wear of the ash discharge valve body; 2. When the electric control valve at the lower end of this point is opened and connected to the pneumatic conveying system, when cleaning the silicon powder in the buffer silo, the silicon powder in the buffer silo is too dense and stuck in the buffer silo and cannot be discharged, or the silicon powder in the buffer silo falls into the pneumatic conveying pipeline at the lower end in an instant, blocking the pipeline, affecting the normal use of the system, and requiring manual clearing, wasting manpower.

[0004] When the pneumatic conveying system cleans the dust at a point, the ash unloading valve at that point rotates, and the pneumatic conveying system is connected to the lower cone space of the dust removal equipment, which will accelerate the speed of the dust from the lower cone to the pneumatic conveying pipeline. When the dust passes through the ash unloading valve and the electric control valve, the high-speed and hard dust will wear the valve body and shorten the service life of the valve. Utility Model Content

[0005] The utility model aims to solve the above-mentioned problems existing in the dust cleaning process of the pneumatic conveying system in the prior art, and proposes a chain control system for dust removal of polysilicon materials.

[0006] In order to achieve the above utility model purpose, the technical solution of the utility model is as follows:

[0007] A chain control system for dust removal of polysilicon material, characterized in that it includes a pneumatic conveying system pipeline and a plurality of points to be cleaned connected to the pneumatic conveying system pipeline, each point to be cleaned is provided with a material level monitoring meter, and each pipeline connecting the point to be cleaned to the pneumatic conveying system pipeline is provided with an electric control valve chain-controlled with the corresponding material level monitoring meter, and the material level monitoring meter and the electric control valve in each point to be cleaned are electrically connected to a controller for controlling the start and stop of the pneumatic conveying system.

[0008] Furthermore, the material level detector is used to feed back a detection signal to the controller of the pneumatic conveying system after the point to be cleaned reaches the material level alarm threshold.

[0009] Furthermore, the controller is used to open the electric control valves on each point to be cleaned in sequence according to the feedback signal of the material level monitoring meter and the alarm sequence, and to discharge the dust in the point to be cleaned by controlling the pneumatic conveying system to open.

[0010] Furthermore, the input end of each point to be cleaned is connected to the output end of the dust removal device, and a dust discharge valve for controlling the on-off of the pipeline is provided on the connecting pipeline between the dust removal device and the point to be cleaned.

[0011] Furthermore, the ash discharge valve at each point to be cleaned is electrically connected to the material level monitoring meter and the electric control valve in the cleaning point.

[0012] Furthermore, each ash discharge valve connected to the point to be cleaned is electrically connected to a controller for controlling the start and stop of the pneumatic conveying system.

[0013] Furthermore, the ash discharge valve and the electric control valve in each point to be cleaned are not opened at the same time.

[0014] The working principle of the utility model is as follows:

[0015] When each point to be cleaned connected to the pneumatic conveying system reaches the alarm threshold of the material level monitor, the material level monitor will feed back the detection signal to the controller of the pneumatic conveying system, and the controller will start the pneumatic conveying system. At the same time, the electric control valves in the pneumatic conveying system connected to each point to be cleaned will be opened in sequence according to the alarm sequence, and the dust in the buffer silo will be discharged through the pneumatic conveying system.

[0016] In summary, the utility model has the following advantages:

[0017] 1. The utility model realizes the interlocking control of the dust removal of polysilicon materials. Several points to be cleaned in the pneumatic conveying system can be controlled separately, thereby controlling the number of dust cleaning points each time, requiring a small air volume and small pipeline for the pneumatic conveying system, and reducing the construction cost;

[0018] 2. The interlocking control system of the utility model enables the controller to control the start and stop of the pneumatic conveying system through the signal feedback of the material level monitoring meter, which can avoid the pneumatic conveying system from being started all the time and save the startup and operation costs;

[0019] 2. In the utility model, the ash discharge valve and the electric control valve can be controlled to open at different times through the interlocking control system. When the ash discharge valve is in operation, the electric control valve is closed, thereby ensuring the airtightness of the lower pneumatic conveying system and avoiding affecting the cleaning of other buffer silos; when the electric control valve is in operation, the ash discharge valve is closed, and the ash discharge valve blocks the gas passage between the dust collector and the pneumatic conveying system, thereby avoiding damage to the valve plate of the electric control valve and the valve body of the ash discharge valve due to high-speed dust erosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a single point to be cleaned in the utility model;

[0021] In the figure:

[0022] 1. Dust collector, 2. Ash discharge valve, 3. Buffer silo, 4. Electric control valve, 5. Pneumatic conveying system pipeline, 6. Controller, 7. Material level meter. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0026] In the description of the present utility model, it should be noted that the terms "upper", "vertical", "inner", "outer", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, or the orientation or position relationship commonly understood by those skilled in the art, which is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "installation" and "connection" 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 or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] Example 1

[0029] The utility model discloses a chain control system for dust removal of polysilicon materials, including a pneumatic conveying system and a plurality of points to be cleaned connected to the pneumatic conveying system, each of which is connected to the pneumatic conveying system pipeline 5 through a pipeline. The pneumatic conveying system in this embodiment is a mature system, and its operating principle is to clean the dust at the connected points to be cleaned by introducing high-speed airflow.

[0030] In this embodiment, each point to be cleaned is provided with a material level monitoring meter, and each point to be cleaned is connected to the pipeline of the pneumatic conveying system with an electric control valve 4 for interlocking control with the corresponding material level monitoring meter. The material level monitoring meter and the electric control valve 4 in each point to be cleaned are electrically connected to the controller 6 for controlling the start and stop of the pneumatic conveying system.

[0031] The working principle of this embodiment is as follows:

[0032] When each point to be cleaned connected to the pneumatic conveying system reaches the alarm threshold of the material level monitor, the material level monitor will feed back the detection signal to the controller 6 of the pneumatic conveying system, and the controller 6 will start the pneumatic conveying system. At the same time, the electric control valve 4 in the pneumatic conveying system connected to each point to be cleaned will be opened in sequence according to the alarm sequence, and the dust in the buffer silo 3 will be discharged through the pneumatic conveying system.

[0033] The interlocking control system of the utility model can control the number of points to be cleaned each time the dust is cleaned, and the air volume and pipeline requirements of the pneumatic conveying system are small, which reduces the construction cost. At the same time, it also avoids the pneumatic conveying system from being started all the time, saving the startup and operation costs.

[0034] Example 2

[0035] As a preferred embodiment of the utility model, this embodiment discloses an interlocking control system for dust removal of polysilicon materials, including a pneumatic conveying system and a plurality of points to be cleaned connected to the pneumatic conveying system, each of which is connected to the conveying system pipeline through a pipeline.

[0036] Each point to be cleaned is provided with a material level monitor, and each point to be cleaned is connected to the pipeline of the pneumatic conveying system with an electric control valve 4 for interlocking control with the corresponding material level monitor. The material level monitor and the electric control valve 4 in each point to be cleaned are electrically connected to the controller 6 for controlling the start and stop of the pneumatic conveying system.

[0037] In this embodiment, the input end of each point to be cleaned is connected to the output end of the dust removal device, and a dust discharge valve 2 for controlling the on-off of the pipeline is provided on the connecting pipe between the dust removal device and the point to be cleaned. The dust discharge valve 2 on each point to be cleaned is electrically connected to the material level monitoring meter and the electric control valve 4 in the cleaning point. At the same time, the dust discharge valve 2 connected to each point to be cleaned is electrically connected to the controller 6 of the pneumatic conveying system. When cleaning, the controller 6 controls the dust discharge valve 2 and the electric control valve 4 in each point to be cleaned to not open at the same time.

[0038] In this embodiment, the point to be cleaned is set as a buffer silo 3, and the buffer silo 3 serves as a temporary collector of silicon powder. After a certain amount of silicon powder is collected inside, the material level monitor issues a high material level alarm and feeds back the detection signal to the controller 6 of the pneumatic conveying system. The controller 6 starts the pneumatic conveying system and at the same time closes the ash discharge valve 2 on the pipeline of the dust removal device connected to the buffer silo 3, opens the electric control valve 4 of the pipeline 5 of the buffer silo 3 connected to the pneumatic conveying system, and discharges the dust in the buffer silo 3 through the pneumatic conveying system.

[0039] In the utility model, when the ash discharge valve 2 in each point to be cleaned is in operation, the electric control valve 4 is closed, which ensures the airtightness of the lower pneumatic conveying system and avoids affecting the cleaning of other buffer silos 3. When the electric control valve 4 is in operation, the ash discharge valve 2 is closed, and the ash discharge valve 2 blocks the gas passage between the dust collector 1 and the pneumatic conveying system, avoiding the valve plate of the electric control valve 4 and the valve body of the ash discharge valve 2 from being damaged by high-speed dust scouring.

[0040] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A chain control system for polysilicon material dust removal, characterized in that: The invention comprises a pneumatic conveying system pipeline (5) and a plurality of points to be cleaned connected to the pneumatic conveying system pipeline (5), each point to be cleaned is provided with a material level monitoring meter, and an electric control valve (4) interlocked with the corresponding material level monitoring meter is provided on the pipeline connecting each point to be cleaned to the pneumatic conveying system pipeline (5), and the material level monitoring meter and the electric control valve (4) in each point to be cleaned are electrically connected to a controller (6) for controlling the start and stop of the pneumatic conveying system.

2. A chain control system for polysilicon material dust removal as claimed in claim 1, characterized in that: The material level monitor is used to feed back a detection signal to a controller (6) of the pneumatic conveying system after the point to be cleaned reaches a material level alarm threshold.

3. A chain control system for polysilicon material dust removal as claimed in claim 2, characterized in that: The controller (6) is used to open the electric control valves (4) at each point to be cleaned in sequence according to the feedback signal of the material level monitoring meter and the alarm sequence, and to discharge the dust in the point to be cleaned by controlling the pneumatic conveying system to open.

4. A chain control system for polysilicon material dust removal as claimed in claim 1, characterized in that: The input end of each point to be cleaned is connected to the output end of the dust removal device, and a dust discharge valve (2) for controlling the on-off of the pipeline is provided on the connecting pipeline between the dust removal device and the point to be cleaned.

5. A chain control system for polysilicon material dust removal as claimed in claim 4, characterized in that: The ash discharge valve (2) at each point to be cleaned is electrically connected to a material level monitoring meter and an electric control valve (4) at the cleaning point.

6. A chain control system for polysilicon material dust removal as claimed in claim 5, characterized in that: Each ash discharge valve (2) connected to the point to be cleaned is electrically connected to a controller (6) for controlling the start and stop of the pneumatic conveying system.

7. A chain control system for polysilicon material dust removal as claimed in claim 5, characterized in that: The ash discharge valve (2) and the electric control valve (4) at each point to be cleaned are not opened at the same time.

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