Device for improving application quality of single crystal reclaimed material

Abstract

The invention discloses a device for improving application quality of single crystal reclaimed materials, which relates to the technical field of single crystal silicon screening and comprises a vibrating screen classifier and a fine powder suction device connected with the vibrating screen classifier. A plurality of screening plates arranged from top to bottom are arranged in the vibration screening machine, one side of each screening plate is hinged to a machine shell of the vibration screening machine, and the other side of each screening plate is connected with an angle adjusting device; electric doors in one-to-one correspondence with the screening plates are arranged on the machine shell; and the apertures of screening holes of the screening plate are gradually reduced from top to bottom. The multi-layer screening plate is adopted, the vibration generator is used for generating uniform vibration, the problem of uneven force caused by manual operation is avoided, the screening result is standardized and quantifiable, and the classification precision of recycled materials is improved; the apertures of the sieve pores are gradually reduced from top to bottom, so that efficient separation of silicon materials (such as 0-3mm and 3-70mm) with different particle sizes is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of single-crystal silicon screening, and particularly relates to a device for improving the application quality of single-crystal recycled materials. Background Art

[0002] In the process of single-crystal silicon production, the edge skins and recycled materials remaining after machining qualified square bars need to be transported to the silicon material cleaning workshop. After pickling, reagent cleaning, and drying treatments, they are recycled to the single-crystal workshop through manual or mechanical crushing. However, during the crushing process of silicon materials, recycled materials with different particle sizes are generated. Currently, the mainstream classification standards in the industry are two specifications: 0 - 3 mm and 3 - 70 mm.

[0003] During the crushing process, due to the physical impact between the tungsten hammer and the silicon material, fine materials less than 3 mm and silicon powder that is easily adsorbed on the surface of the recycled materials are generated. Compared with large-sized recycled materials, the specific surface area of such fine particles is larger, and they are more easily affected by non-silicon factors such as residual acid solution, metal contamination, and dust adsorption in the process, thereby reducing the purity of the recycled materials and having an adverse impact on the quality of subsequent single-crystal drawn products. Therefore, some silicon material factories have strictly monitored the surface metal content and output ratio of 0 - 3 mm fine materials to evaluate the degree of process pollution and optimize quality control management.

[0004] Currently, the industry generally uses a 3 mm round-hole polytetrafluoroethylene sieve plate for manual screening of recycled materials, but this method has the following defects: 1. Uncontrollable screening force: Manual operation is greatly affected by the operator's state. The force difference between different operators will lead to unstable screening efficiency of 3 mm fine powder materials, affecting the classification accuracy of recycled materials.

[0005] 2. Silicon powder accumulation and pollution: During the screening process, fine powder is easily accumulated on the sieve plate, which may not only cause secondary pollution but also reduce the screening efficiency.

[0006] 3. Dust endangers health: During manual screening, silicon dust is easily dispersed into the air, and long-term inhalation will damage the respiratory system of operators, not meeting the occupational health and safety standards. Summary of the Invention

[0007] In order to overcome the problems existing in the background art, the present invention provides a device for improving the application quality of single-crystal recycled materials.

[0008] To achieve the above object, the present invention is realized by the following technical solutions: A device for improving the application quality of single-crystal recycled materials, comprising: a vibrating screen, and a fine powder suction device connected to the vibrating screen; a plurality of screening plates arranged from top to bottom are provided in the vibrating screen, one side of the screening plate is hinged to the casing of the vibrating screen, and the other side is connected to an angle adjusting device; electric doors corresponding to the screening plates one by one are provided on the casing; the aperture of the screening holes of the screening plate gradually becomes smaller from top to bottom.

[0009] Preferably, the angle adjusting device includes: a first electric push rod provided at the top of the casing, and its first piston rod vertically penetrates the casing; a linkage rod vertically provided in the casing and fixedly connected to the first piston rod; two sliding rods horizontally provided on one side of the screening plate; two linear bearings respectively sleeved on the sliding rods; a connecting rod connecting the two linear bearings; bearings corresponding to the connecting rod one by one are provided on the linkage rod, and the bearings support the connecting rod to rotate.

[0010] Flexible rubber plates are provided on the side of the upper and lower adjacent screening plates away from the hinge; the side of the uppermost screening plate away from the hinge is connected to the top of the casing through the flexible rubber plate.

[0011] Preferably, the electric door includes: a square hole opened on the side wall of the casing and located between adjacent screening plates; a rotating shaft fixed to the side wall of the casing; a trough-shaped door hinged to the casing with the rotating shaft as the axis for closing or opening the square hole; a gear fixed to the trough-shaped door and concentric with the rotating shaft; a plurality of square sleeves fixed to the side wall of the casing; a rack vertically penetrating through all the square sleeves and meshing with the gear; a second electric push rod fixed to the side wall of the casing, and its second piston rod is connected to the rack for driving the rack to move up and down.

[0012] Preferably, a feed inlet is provided at the top of the casing, and a feed hopper is connected to the feed inlet.

[0013] Preferably, a first funnel is provided below the lowermost screening plate, the bottom of the first funnel is communicated with the bottom of the casing through a corrugated pipe; the intake pipe of the fine powder suction device is connected to the corrugated pipe.

[0014] Preferably, a support frame is provided outside the casing, the support frame is connected to the casing through a plurality of damping shock absorbers; a vibration generator is provided at the bottom of the casing.

[0015] The beneficial effects of the present invention compared with the prior art: 1. The present invention uses a multi-layer screening plate and a vibration generator to generate uniform vibration, avoiding the problem of uneven force caused by manual operation, standardizing and quantifying the screening results, and improving the classification accuracy of recycled materials; the aperture of the sieve holes gradually decreases from top to bottom to ensure the efficient separation of silicon materials with different particle sizes (such as 0-3mm, 3-70mm).

[0016] 2. Through a sealed casing and a fine powder suction device, the present invention adsorbs and collects fine silicon powder (<3mm) in real time during the screening process, avoiding cross-contamination caused by the accumulation or dusting of silicon powder, ensuring the cleanliness of recycled materials, and reducing the impurity risk during the subsequent single crystal pulling process.

[0017] 3. The present invention realizes the automatic unloading of the recycled materials after screening through an angle adjustment device and an electric door, improving the automation degree of screening and reducing the labor intensity of workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic structural diagram of a device for improving the application quality of single crystal recycled materials; Figure 2 Schematic internal structure diagram of a vibrating screen; Figure 3 Schematic internal structure diagram of a fine powder suction device.

[0019] In the figure: vibrating screen 1, fine powder suction device 2, screening plate 3, casing 4, angle adjustment device 5, electric door 6, first electric push rod 7, first piston rod 8, linkage rod 9, slide rod 10, linear bearing 11, connecting rod 12, bearing 13, flexible rubber plate 14, square hole 15, rotating shaft 16, trough-shaped door 17, gear 18, sleeve 19, second electric push rod 20, rack 21, feed hopper 22, feed inlet 23, first funnel 24, bellows 25, hollow housing 26, support plate 27, dust removal bag 28, axial flow fan 29, pulse valve 30, solenoid valve 31, second funnel 32, ash discharge valve 33, metal braided hose 34, support frame 35, vibration generator 36, damping shock absorber 37. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] In order to make the objectives, technical solutions, and beneficial effects of the present invention clearer, the preferred embodiments of the present invention will be described in detail below to facilitate understanding by those skilled in the art.

[0021] Please refer to Figures 1 to 3, the present invention provides a device for improving the application quality of single-crystal recycled materials, including: a vibrating screen 1, and a fine powder suction device 2 connected to the vibrating screen 1; a plurality of screening plates 3 arranged vertically from top to bottom are provided in the vibrating screen 1, one side of the screening plate 3 is hinged to the casing 4 of the vibrating screen 1, and the other side is connected to an angle adjusting device 5; an electric door 6 corresponding to the screening plate 3 is provided on the casing 4; the aperture of the screening holes of the screening plate 3 gradually decreases from top to bottom. In this embodiment, two layers of screening plates 3 are provided, the aperture of the screening holes at the topmost layer is equal to 70 mm, and the aperture of the second layer is 3 mm; in other embodiments, in order to perform more refined screening and grading, the levels of the screening holes are more finely graded. When performing the screening operation, the angle adjusting device 5 makes the screening plate 3 in a horizontal state. After the screening is completed, the electric door 6 is opened, and the angle adjusting device 5 is started to lift the other side of the screening plate 3, and the recycled materials are discharged from the electric door 6 under the action of vibration. The screening of the screening plate 3 in the horizontal state is more thorough, which has more advantages compared with the preset inclination method of relying on gravity to discharge the recycled materials.

[0022] The angle adjusting device 5 includes: a first electric push rod 7 provided at the top of the casing 4, and its first piston rod 8 vertically passes through the casing 4; a linkage rod 9 vertically provided in the casing 4 and fixedly connected to the first piston rod 8; two slide rods 10 horizontally provided on one side of the screening plate 3; two linear bearings 11 respectively sleeved on the slide rods 10; a connecting rod 12 connecting the two linear bearings 11; bearings 13 corresponding to the connecting rod 12 are provided on the linkage rod 9, and the bearings 13 support the rotation of the connecting rod 12. The first piston rod of the first electric push rod 7 pulls the linkage rod 9, the linkage rod 9 lifts the connecting rod 12, and the connecting rod 12 lifts the screening plate 3 to make the screening plate 3 tilt towards the electric door 6, and under the action of vibration, it can be discharged from the electric door 6. The screening of the screening plate 3 in the horizontal state is more thorough, which has more advantages compared with the preset inclination method of relying on gravity to discharge the recycled materials.

[0023] Flexible rubber plates 14 are provided on the side of the adjacent upper and lower screening plates 3 away from the hinge; the side of the topmost screening plate 3 away from the hinge is connected to the top of the casing 4 through the flexible rubber plate 14. The flexible rubber plate 14, the electric door 6, and the front and rear inner walls of the casing 4 form a relatively closed space during the screening operation to prevent dust from flying.

[0024] The electric door 6 includes: a square hole 15 formed in the side wall of the casing 4 and located between adjacent screening plates 3; a rotating shaft 16 fixed to the side wall of the casing 4; a trough-shaped door 17 hinged to the casing 4 with the rotating shaft 16 as the axis for closing or opening the square hole 15; a gear 18 fixed to the trough-shaped door 17 and concentric with the rotating shaft 16; a plurality of square sleeves 19 fixed to the side wall of the casing 4; a rack 21 vertically passing through all the square sleeves 19 and meshing with the gear 18; a second electric push rod 20 fixed to the side wall of the casing 4, whose second piston rod is connected to the rack 21 for driving the rack 21 to move up and down. When the second electric push rod 20 pushes the rack 21 to move upward, it drives the gear 18 to rotate and opens the trough-shaped door 17. When the second electric push rod 20 pushes the rack 21 to move downward, it drives the gear 18 to rotate and closes the trough-shaped door 17 to close the square hole 15.

[0025] A feed inlet 23 is provided at the top of the casing 4, and a feed hopper 22 is connected to the feed inlet 23.

[0026] A first funnel 24 is provided below the lowermost screening plate 3. The bottom of the first funnel 24 is communicated with the bottom of the casing 4 through a corrugated pipe 25; the intake pipe of the fine powder suction device 2 is connected to the corrugated pipe 25. Fine powder smaller than 3 mm falls into the first funnel 24 and is sucked away by the fine powder suction device 2.

[0027] The fine powder suction device 2 includes: a hollow housing 26, a support plate 27 horizontally disposed in the hollow housing 26, a plurality of mounting holes provided on the support plate 27, a cage provided in the mounting holes, a dust removal cloth bag 28 sleeved on the cage, an axial flow fan 29 provided at the top end of the hollow housing 26, a pulse valve 30 provided at the top end of the hollow housing 26 opposite to the mounting holes, and an electromagnetic valve 31 provided on the pipeline of the axial flow fan 29. A second funnel 32 is provided at the bottom of the hollow housing 26, a dust discharge valve 33 is provided at the bottom of the second funnel 32, and a metal braided hose 34 is provided at the position of the hollow housing 26 below the support plate 27 to connect to the corrugated pipe 25; the pulse valve 30 is connected to an air compressor.

[0028] A support frame 35 is provided outside the casing 4, and the support frame 35 is connected to the casing 4 through a plurality of damping shock absorbers; a vibration generator 36 is provided at the bottom of the casing 4, and the vibration generator 36 is a vibrator.

[0029] The device for improving the application quality of single crystal recycled materials further includes a PLC controller for controlling the first electric push rod 7, the second electric push rod 20, the vibrator, the axial flow fan 29, the pulse valve 30, and the electromagnetic valve 31.

[0030] When the device for improving the application quality of single crystal recycled materials of the present invention is in use: Start the vibrator and the axial flow fan 29 through the PLC controller. Pour the recycled material from the feed hopper 22. Under the action of vibration, the screening plate 3 divides the recycled material into specifications greater than 70 mm, 3 - 70 mm, and less than 3 mm. When screening, the axial flow fan 29 drives the air flow to enter from the feed hopper 22 and pass through two layers of screening plates 3. The fine silicon powder is carried by the air flow to the fine powder suction device 2. The silicon powder with a specification less than 3 mm is intercepted by the dust removal cloth bag 28 and accumulates in the second funnel 32. After the screening is completed, control the second electric push rod 20 to open the trough-shaped door 17, and control the first electric push rod 7 to tilt the screening plate 3 towards the square hole 15. The silicon with a specification greater than 70 mm and the silicon with a specification of 3 - 70 mm flow out along the trough-shaped door 17, and the silicon with a specification greater than 70 mm and the silicon with a specification of 3 - 70 mm are respectively received using containers. Use the PLC controller to turn off the vibrator and the axial flow fan 29, close the solenoid valve 31, control the pulse valve 30 to blow the dust removal cloth bag 28 to blow down the fine silicon powder, and open the ash discharge valve 33 to discharge the fine silicon powder after accumulating to a certain amount.

[0031] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not restrictive. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in terms of form and details without departing from the scope defined by the claims of the present invention.

Claims

1. An apparatus for improving the application quality of single-crystal recycled materials, characterized in that, Comprising: A vibrating screen (1), and a fine powder suction device (2) connected to the vibrating screen (1); a plurality of screening plates (3) arranged from top to bottom are provided inside the vibrating screen (1), one side of the screening plate (3) is hinged to the casing (4) of the vibrating screen (1), and the other side is connected to an angle adjusting device (5); an electric door (6) corresponding to the screening plate (3) one by one is provided on the casing (4); the aperture of the screening holes of the screening plate (3) gradually becomes smaller from top to bottom.

2. The device for improving the application quality of single crystal recycled materials according to claim 1, characterized in that, The angle adjusting device (5) includes: a first electric push rod (7) provided at the top of the casing (4), and its first piston rod (8) vertically passes through the casing (4); a linkage rod (9) vertically provided inside the casing (4) and fixedly connected to the first piston rod (8); two sliding rods (10) horizontally provided on one side of the screening plate (3); two linear bearings (11) respectively sleeved on the sliding rods (10); a connecting rod (12) connecting the two linear bearings (11); bearings (13) corresponding to the connecting rod (12) one by one are provided on the linkage rod (9), and the bearings (13) support the connecting rod (12) to rotate.

3. The device for improving the application quality of single-crystal recycled materials according to claim 2, wherein: Flexible rubber plates (14) are provided on the side away from the hinge of the adjacent upper and lower screening plates (3); the side away from the hinge of the uppermost screening plate (3) is connected to the top of the casing (4) through the flexible rubber plate (14).

4. The device for improving the application quality of single crystal recycled materials according to claim 3, characterized in that, The electric door (6) includes: a square hole (15) opened on the side wall of the casing (4) and located between adjacent screening plates (3); a rotating shaft (16) fixed to the side wall of the casing (4); a trough-shaped door (17) hinged to the casing (4) with the rotating shaft (16) as the axis for closing or opening the square hole (15); a gear (18) fixed to the trough-shaped door (17) and concentric with the rotating shaft (16); a plurality of square sleeves (19) fixed to the side wall of the casing (4); a rack (21) vertically passing through all the square sleeves (19) and meshing with the gear (18); a second electric push rod (20) fixed to the side wall of the casing (4), and its second piston rod is connected to the rack (21) for driving the rack (21) to move up and down.

5. The device for improving the application quality of single-crystal recycled materials according to claim 4, wherein A feed inlet (23) is provided at the top of the casing (4), and a feed hopper (22) is connected to the feed inlet (23).

6. The device for improving the application quality of single-crystal recycled materials according to claim 5, characterized in that, A first funnel (24) is provided below the lowermost screening plate (3), the bottom of the first funnel (24) is communicated with the bottom of the casing (4) through a corrugated pipe (25); the intake pipe of the fine powder suction device (2) is connected to the corrugated pipe (25).

7. The device for improving the application quality of single-crystal recycled materials according to claim 6, characterized in that, A support frame (35) is provided outside the casing (4), the support frame (35) is connected to the casing (4) through a plurality of damping shock absorbers (37); a vibration generator (36) is provided at the bottom of the casing (4).

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