A device for classifying and screening polysilicon lumps

Abstract

The application discloses a kind of polycrystalline silicon block's grading screening device, belong to polycrystalline silicon material processing technical field.The device includes elevator, primary vibrating screen, secondary vibrating screen, tertiary vibrating screen, four vibrating screen, basket and conveying line, and polycrystalline silicon block is automatically lifted and poured into primary vibrating screen by elevator, and is screened by multistage vibrating screen, and different particle sizes of silicon material after screening respectively fall into corresponding loading platform, and are automatically loaded by basket, and are sent to discharge platform after temporary storage, turning and conveying.The application realizes the automatic grading screening of polycrystalline silicon block, automatic basket loading and automatic transfer, and has high grading precision and high degree of automation, and can be applied to block grading screening process in polycrystalline silicon production.

Description

Technical Field

[0001] This invention relates to the field of polysilicon processing technology, and in particular to a grading and screening device for polysilicon blocks. Background Technology

[0002] Polysilicon is a fundamental raw material for the solar photovoltaic cell and semiconductor industries, widely used in solar cells, integrated circuits, and other fields. During polysilicon production, large polysilicon ingots typically need to be crushed into silicon blocks of different particle sizes for downstream processes such as monocrystalline silicon pulling or ingot casting. Because the crushed polysilicon blocks have a wide particle size distribution, failure to grade and screen them will directly affect the stability of subsequent processes and the quality of the final product. Therefore, it is necessary to grade and screen the polysilicon blocks to obtain silicon material that meets specific particle size requirements.

[0003] CN121945405A discloses a polycrystalline silicon block screening device and method. The device includes a top cover, a first screening mechanism, a second screening mechanism, and a bottom receiving mechanism, all rigidly connected vertically. A vibration mechanism on the receiving mechanism drives the entire device to vibrate, and a vibrating element below the screen continuously impacts the screen to prevent clogging. While this device addresses the problems of screen clogging and difficult cleaning and maintenance during screening to some extent, it relies solely on vibration for screening. The sieved silicon material of different particle sizes still requires manual collection and sorting. The automation level of material transfer between screening and subsequent processes is low, making it difficult to meet the needs of large-scale continuous production.

[0004] CN110711698A discloses a linear vibrating sieving device and method for monocrystalline and polycrystalline silicon materials, which improves the sieving effect by adjusting the height and tilt angle of the screen box through a support mechanism. Although this device solves the problem of the difficulty in adjusting the overall height of the sieving device, it still does not address the automatic grading, collection, and transfer of silicon materials of different particle sizes after sieving. Silicon materials of different particle sizes still need to be manually sorted and loaded into baskets after sieving, resulting in high labor costs and high labor intensity. Furthermore, impurities are easily introduced into the silicon materials during manual transfer, affecting product quality.

[0005] In summary, existing technologies have significant shortcomings in the automatic grading, automatic basketing, and automatic transfer of polysilicon ingots. There is an urgent need for a screening device that can achieve automatic grading, screening, basketing, and automatic transfer of polysilicon ingots. Summary of the Invention

[0006] The purpose of this invention is to provide a grading and screening device for polycrystalline silicon blocks, so as to solve the problems of the inability to automatically grade and collect polycrystalline silicon blocks after screening, low degree of automation in transfer, and high labor costs in the prior art.

[0007] This invention is implemented by the following technical solution: A grading and screening device for polycrystalline silicon ingots includes an elevator, a primary vibrating screen, a secondary vibrating screen, a tertiary vibrating screen, a quaternary vibrating screen, a material basket, and a conveyor line. The elevator is located on one side of the primary vibrating screen. The oversize outlet of the primary vibrating screen is connected to a large material hopper. The undersize outlet of the primary vibrating screen is connected to the inlet of the secondary vibrating screen. The undersize outlet of the secondary vibrating screen is connected to the inlet of the tertiary vibrating screen. The oversize outlet of the secondary vibrating screen is positioned above a first loading platform. The undersize outlet of the tertiary vibrating screen includes a first... The three-stage vibrating screen is divided into two sections: the first discharge port and the second discharge port. The screen holes in the front section correspond to the first discharge port, and the screen holes in the rear section correspond to the second discharge port. The screen holes in the front section are smaller than those in the rear section. The first discharge port is connected to the waste bin, and the second discharge port is located above the second loading platform. The oversize outlet of the three-stage vibrating screen is connected to the four-stage vibrating screen. The undersize outlet of the four-stage vibrating screen is located above the third loading platform, and the oversize outlet of the four-stage vibrating screen is located above the fourth loading platform. The material basket is movable on the conveyor line.

[0008] Advantages of this invention: (1) By setting up a first-stage vibrating screen, a second-stage vibrating screen, a third-stage vibrating screen and a fourth-stage vibrating screen, the present invention performs multi-stage continuous screening of polycrystalline silicon blocks, realizes automatic grading of silicon materials of different particle sizes, eliminates the need for manual sorting, and significantly improves grading efficiency and grading accuracy. (2) By setting up a conveyor line and a material basket, the silicon material of different particle sizes screened by each level of vibrating screen can automatically fall into the corresponding loading platform, and be automatically loaded, temporarily stored, transferred and discharged by the material basket. This realizes the automatic connection between screening and subsequent etching processes, reduces labor costs and labor intensity, avoids the introduction of impurities during manual transfer, and ensures product quality. (3) The present invention improves the feeding efficiency by setting up an elevator and using the automatic tilting and dumping of the hopper to realize the automatic feeding of polycrystalline silicon blocks; (4) The present invention sets up a conveyor roller and a proximity sensor that can be controlled to rotate independently on the temporary storage line, so as to realize the accurate detection of the position of the material basket and automatic parking, thereby improving the positioning accuracy and automation level of the material basket transfer. (5) The present invention provides a vibrating feeder at the material outlet of each level of vibrating screen, which ensures the smooth discharge of materials, prevents materials from accumulating and blocking at the outlet, and improves the continuity and stability of the device operation. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the hoist in this invention; Figure 3 This is a schematic diagram of the structure of the hopper in this invention; Figure 4This is a schematic diagram of the structure of the three-stage vibrating screen in this invention; Figure 5 This is a schematic diagram of the conveyor line in this invention; Figure 6 This is a schematic diagram of the structure of the loading line and the temporary storage line in this invention; Figure 7 This is a schematic diagram of the structure of the steering platform in this invention; In the diagram: 1. Elevator; 2. Primary vibrating screen; 3. Secondary vibrating screen; 4. Tertiary vibrating screen; 5. Quaternary vibrating screen; 6. Material basket; 7. Conveyor line; 8. Large material bin; 9. Waste bin; 10. Vibrating feeder; 101. Column; 102. Slide table; 103. Hopper; 104. Tilting guide rail; 105. Bushing; 106. Rotating shaft; 107. Guide wheel; 108. Lifting motor; 109. Lifting synchronous belt; 401. First discharge port; 402. Second discharge port; 7 701. First loading platform; 702. Second loading platform; 703. Third loading platform; 704. Fourth loading platform; 705. Turning platform; 706. Conveying platform; 707. Discharge platform; 708. Return platform; 709. Loading line; 710. Temporary storage line; 711. First proximity sensor; 712. Second proximity sensor; 7051. Base; 7052. Conveying device; 7053. Rotary cylinder; 7054. Third proximity sensor; 7055. Fourth proximity sensor. Detailed Implementation

[0010] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0011] like Figure 1The diagram shows a grading and screening device for polycrystalline silicon blocks, comprising an elevator 1, a primary vibrating screen 2, a secondary vibrating screen 3, a tertiary vibrating screen 4, a quaternary vibrating screen 5, a material basket 6, and a conveyor line 7. The elevator 1 is located on one side of the primary vibrating screen 2. The oversize outlet of the primary vibrating screen 2 is connected to a large material bin 8. The undersize outlet of the primary vibrating screen 2 is connected to the inlet of the secondary vibrating screen 3. The undersize outlet of the secondary vibrating screen 3 is connected to the inlet of the tertiary vibrating screen 4. The oversize outlet of the secondary vibrating screen 3 is positioned above a first loading platform 701. The undersize outlet of the tertiary vibrating screen 4 includes a first discharge port 401 and a second discharge port 402. The tertiary vibrating screen 4 is divided into two sections: the first discharge port 401 corresponds to the area below the screen holes in the front section, and the second discharge port 402 corresponds to the area below the screen holes in the rear section. The screen holes in the front section are smaller than those in the rear section. The first discharge port 401 is connected to a waste bin 9, and the second discharge port 402 is positioned above a second loading platform 702. The oversize outlet of the third-stage vibrating screen 4 is connected to the fourth-stage vibrating screen 5. The undersize outlet of the fourth-stage vibrating screen 5 is located above the third loading platform 703, and the oversize outlet of the fourth-stage vibrating screen 5 is located above the fourth loading platform 704. The material basket 6 is movable and set on the conveyor line 7. Vibrating feeders 10 are provided at the oversize outlet of the first-stage vibrating screen 2, the oversize outlet of the second-stage vibrating screen 3, the first discharge port 401 and the second discharge port 402 of the third-stage vibrating screen 4, and the oversize outlet and undersize outlet of the fourth-stage vibrating screen 5. The structures of the first-stage vibrating screen 2, the second-stage vibrating screen 3, the third-stage vibrating screen 4, and the fourth-stage vibrating screen 5 are basically the same, all including a screen bed, a vibrating motor, and a screen plate. The screen bed is supported and mounted on the frame by vibration damping springs. The vibrating motor is fixedly mounted on the screen bed, and the screen plate is fixedly mounted inside the screen bed. The screen plate has several screen holes, and the screen hole diameter decreases sequentially for each stage of the vibrating screen. During operation, the vibrating motor generates excitation force, driving the screen bed and its screen plates to reciprocate. Polycrystalline silicon blocks fall onto the screen plates and, under the action of vibration, jump downwards along the screen surface. Silicon particles smaller than the screen openings pass through the openings and become undersize material, while silicon particles larger than the openings remain on the screen surface and continue moving forward, exiting from the oversize outlet, thus achieving the separation of silicon particles of different sizes. The three-stage vibrating screen 4 has screen plates divided into front and rear sections. The screen openings of the front section are smaller than those of the rear section, allowing for the separate screening of silicon particles of different sizes.

[0012] In this embodiment, the aperture sizes of the primary vibrating screen 2, the secondary vibrating screen 3, the tertiary vibrating screen 4, and the quaternary vibrating screen 5 decrease sequentially, and are used to screen the crushed polycrystalline silicon blocks into six particle size grades according to their particle size: greater than 90mm (oversized), 45-90mm, 20-45mm, 6-20mm, 2-6mm, and less than 2mm (waste). Specifically: The primary vibrating screen 2 has a screen aperture of 90mm, used to collect oversized silicon blocks with a particle size greater than 90mm from the crushed polycrystalline silicon material as oversize material, which is fed into the large material box 8 by the vibrating feeder 10 for rejection. Silicon blocks with a particle size less than 90mm are collected as undersize material and enter the secondary vibrating screen 3 for further screening. The secondary vibrating screen 3 has a screen aperture of 45mm, used to further screen silicon material with a particle size less than 90mm. Silicon blocks with a particle size between 45-90mm are collected as oversize material, discharged by the vibrating feeder 10, and fall into the first loading platform 701. Silicon material with a particle size less than 45mm is collected as undersize material and enters the tertiary vibrating screen 4 for further screening. The tertiary vibrating screen 4 is divided into a front section and a rear section. The screen aperture of the front section is... The first section has a 2mm screen, while the second section has a 6mm screen. The first section is used to screen out waste material with a particle size of less than 2mm. The waste material enters the waste bin 9 through the first discharge port 401. The second section is used to screen out silicon material with a particle size between 2-6mm. This part of the silicon material falls into the second loading platform 702 through the second discharge port 402. Silicon blocks with a particle size greater than 6mm are used as the oversize material of the third-stage vibrating screen 4 and enter the fourth-stage vibrating screen 5 for further screening. The fourth-stage vibrating screen 5 has a 20mm screen, which is used to further screen silicon blocks with a particle size greater than 6mm. Silicon material with a particle size between 6-20mm is used as the undersize material and falls into the third loading platform 703. Silicon blocks with a particle size between 20-45mm are used as the oversize material and fall into the fourth loading platform 704.

[0013] like Figure 2As shown, the elevator 1 includes a column 101, a slide 102, a hopper 103, and a tilting guide rail 104. The slide 102 is vertically mounted on the column 101, and a bushing 105 is mounted on the slide 102. A rotating shaft 106 is mounted on the hopper 103, and the bushing 105 and the rotating shaft 106 are coaxially rotatably connected. A guide wheel 107 is mounted on the hopper 103, and the tilting guide rail 104 is fixedly mounted on the column 101. The guide wheel 107 is slidably disposed within the tilting guide rail 104. The elevator 1 also includes a lifting motor 108 and a lifting synchronous belt 109. The lifting motor 108 is fixedly mounted on the column 101, and the upper and lower ends of the lifting synchronous belt 109 are rotatably connected to the column 101. The slide 102 is fixedly connected to the lifting synchronous belt 109. During operation, the lifting motor 108 drives the slide table 102 to move up and down along the column 101 via the lifting synchronous belt 109. The hopper 103 is driven to move up and down by the slide table 102. When the hopper 103 rises to the top, the guide wheel 107 on the hopper 103 slides into the tilting guide rail 104. The guide wheel 107 slides along the trajectory of the tilting guide rail 104, causing the hopper 103 to tilt and tilt around the rotating shaft 106, pouring the silicon blocks in the hopper 103 into the primary vibrating screen 2, thus realizing automatic feeding.

[0014] like Figure 3 As shown, the hopper 103 is coaxially rotatably connected to the bushing 105 on the slide table 102 via the rotating shaft 106. Guide wheels 107 are provided on both sides of the hopper 103. The guide wheels 107 are slidably arranged in the tilting guide rail 104 on the column 101. The opening of the hopper 103 faces one side of the primary vibrating screen 2 so that the silicon blocks can be poured into the primary vibrating screen 2 when tilting.

[0015] like Figure 4 As shown, the three-stage vibrating screen 4 is divided into a front section and a rear section. The screen hole diameter of the front section screen plate is smaller than that of the rear section screen plate. The screen hole of the front section corresponds to the first discharge port 401, and the screen hole of the rear section corresponds to the second discharge port 402. The first discharge port 401 is connected to the waste box 9, and the second discharge port 402 is placed above the second loading platform 702.

[0016] like Figure 5 As shown, the conveyor line 7 includes a first loading platform 701, a second loading platform 702, a third loading platform 703, a fourth loading platform 704, a turning platform 705, a conveying platform 706, a discharge platform 707, and a return platform 708. A turning platform 705 is provided at each end of the first loading platform 701, the second loading platform 702, the third loading platform 703, and the fourth loading platform 704. A conveying platform 706 is provided between two adjacent turning platforms 705. A discharge platform 707 and a return platform 708 are provided at both ends of the turning platforms 705 at both ends of the fourth loading platform 704.

[0017] like Figure 6As shown, the first loading platform 701, the second loading platform 702, the third loading platform 703, and the fourth loading platform 704 all include a loading line 709 and a temporary storage line 710. A parking position is provided on the loading line 709, and 2-4 parking positions are provided on the temporary storage line 710. Each parking position includes a first proximity sensor 711 and a second proximity sensor 712. The temporary storage line 710 is equipped with a conveyor roller that can be rotated independently. By controlling the rotation of the conveyor roller, the material basket 6 is moved to the parking position. The two sensors at the parking position detect the front and rear positions of the material basket 6 respectively, used to control the material basket 6 to reach its designated position. Specifically, at each parking position, the first proximity sensor 711 is located at the front end of the parking position, and the second proximity sensor 712 is located at the rear end of the parking position. When the material basket 6 is conveyed forward by the conveyor rollers into the parking position, the front end of the material basket 6 first reaches the first proximity sensor 711. The first proximity sensor 711 senses the front end of the material basket 6 and sends a first positioning signal to the controller. The material basket 6 continues to move forward. When its front end passes the first proximity sensor 711 and its rear end enters the sensing range of the second proximity sensor 712, the second proximity sensor 712 senses the rear end of the material basket 6 and sends a second positioning signal to the controller. The controller only determines that the material basket 6 has fully entered and stopped in the parking position when it receives both the first and second positioning signals simultaneously. It then controls the conveyor rollers corresponding to that parking position to stop rotating, so that the material basket 6 is accurately parked in position. If only the first positioning signal is received and the second positioning signal is not received, it means that the material basket 6 has not fully entered the parking position. The controller controls the conveyor rollers to continue rotating until the second proximity sensor 712 senses the rear end of the material basket 6. In this way, through the coordinated detection of the first proximity sensor 711 and the second proximity sensor 712, precise control of the parking position of the material basket 6 is achieved. In this embodiment, both the first proximity sensor 711 and the second proximity sensor 712 are inductive proximity sensors, such as the Omron E2E-X3D1-N type proximity sensor (M12 thread, detection distance 3mm); the controller is a programmable logic controller (PLC), such as a Siemens S7-1200 PLC (CPU 1214C) or a Mitsubishi FX3U PLC. The signal output terminals of the first proximity sensor 711 and the second proximity sensor 712 are electrically connected to the digital input terminals of the PLC, and the drive motor of the conveyor roller is electrically connected to the output terminal of the PLC. The PLC controls the start and stop of the drive motor of the conveyor roller according to the position signals of the two sensors, thereby realizing the automatic parking of the material basket 6.

[0018] like Figure 7As shown, the turntable 705 includes a base 7051, a conveying device 7052, a rotary cylinder 7053, a third proximity sensor 7054, and a fourth proximity sensor 7055. The rotary cylinder 7053 is fixedly mounted on the base 7051, and the rotating part of the rotary cylinder 7053 is connected to the bottom of the conveying device 7052. The third proximity sensor 7054 and the fourth proximity sensor 7055 are mounted on the conveying device 7052. In this embodiment, the first loading platform 701, the second loading platform 702, the third loading platform 703, and the fourth loading platform 704 are respectively used to receive silicon materials with four particle sizes of 45-90mm, 2-6mm, 6-20mm, and 20-45mm for loading into the material basket 6; the turning platform 705 is used to turn and transfer the material basket 6 between the loading platform, the conveying platform 706, the discharging platform 707, and the return platform 708, so that the material basket 6 flows along a predetermined path; the conveying platform 706 is used to transport the material basket 6, and transport the fully loaded material basket 6 to the discharging platform 707; the discharging platform 707 is used to send the material basket 6 and the silicon material inside to the etching section; the return platform 708 is used to return the empty material basket after etching, drying, and packaging, so as to realize the recycling of the material basket 6. The loading line 709 is used for loading the material basket 6 at the loading platform; the temporary storage line 710 is used for temporary storage of the material basket 6 after loading; the first proximity sensor 711 and the second proximity sensor 712 are used to detect the front and rear positions of the material basket 6 at the parking position, respectively, and control the material basket 6 to accurately park in place; the base 7051 is used to support the steering platform 705; the conveying device 7052 is used to convey the material basket 6; the rotary cylinder 7053 is used to drive the conveying device 7052 to rotate, so as to realize the steering of the material basket 6; the third proximity sensor 7054 and the fourth proximity sensor 7055 are used to detect the position of the material basket 6 on the steering platform 705.

[0019] The working process of this invention is as follows: Crushed polycrystalline silicon blocks are loaded into hopper 103. Lifting motor 108 drives slide 102 upward via lifting synchronous belt 109. After hopper 103 rises to the top with slide 102, guide wheel 107 slides into tilting guide rail 104. Guide wheel 107 slides along the trajectory of tilting guide rail 104, causing hopper 103 to tilt and pour the silicon blocks into primary vibrating screen 2. Primary vibrating screen 2 screens the silicon blocks. Oversize material enters large material box 8 via vibrating feeder 10, while undersize material enters secondary vibrating screen 3. Oversize material from secondary vibrating screen 3 is discharged via vibrating feeder 10 and falls into first loading platform 701, while undersize material enters tertiary vibrating screen 4. The three-stage vibrating screen 4 is divided into two sections. The screen holes in the front section are smaller, and the undersize material is discharged through the first discharge port 401 and enters the waste bin 9. The screen holes in the rear section are larger, and the undersize material is discharged through the second discharge port 402 and falls into the second loading platform 702. The oversize material from the three-stage vibrating screen 4 enters the four-stage vibrating screen 5. The undersize material from the four-stage vibrating screen 5 falls into the third loading platform 703, and the oversize material falls into the fourth loading platform 704. The material basket 6 loads the screened silicon blocks from the first loading platform 701, the second loading platform 702, the third loading platform 703, and the fourth loading platform 704, then moves them to the temporary storage line 710 for temporary storage, and then transfers them to the conveyor platform 706 via the turning platform 705. After being conveyed, it is sent to the discharge platform 707 and sent to the etching section for etching. After etching, drying, and packaging, the empty material basket is returned from the return platform 708, realizing the recycling of the material basket 6.

[0020] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "front", "rear", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

Claims

1. A grading and screening device for polycrystalline silicon ingots, characterized in that, The system includes an elevator (1), a primary vibrating screen (2), a secondary vibrating screen (3), a tertiary vibrating screen (4), a quaternary vibrating screen (5), a material basket (6), and a conveyor line (7). An elevator (1) is provided on one side of the primary vibrating screen (2). The oversize outlet of the primary vibrating screen (2) is connected to the large material box (8). The undersize outlet of the primary vibrating screen (2) is connected to the inlet of the secondary vibrating screen (3). The undersize outlet of the secondary vibrating screen (3) is connected to the inlet of the tertiary vibrating screen (4). The oversize outlet of the secondary vibrating screen (3) is located above the first loading platform (701). The undersize outlet of the tertiary vibrating screen (4) includes a first discharge port (401) and a second discharge port (402). 02), the three-stage vibrating screen (4) is divided into two sections, front and back. The screen holes of the front section correspond to the first discharge port (401), and the screen holes of the rear section correspond to the second discharge port (402). The screen holes of the front section are smaller than the screen holes of the rear section. The first discharge port (401) is connected to the waste bin (9), and the second discharge port (402) is placed above the second loading platform (702). The oversize outlet of the three-stage vibrating screen (4) is connected to the four-stage vibrating screen (5). The undersize outlet of the four-stage vibrating screen (5) is placed above the third loading platform (703), and the oversize outlet of the four-stage vibrating screen (5) is placed above the fourth loading platform (704). The material basket (6) is moved and set on the conveyor line (7).

2. The grading and screening device for polycrystalline silicon ingots according to claim 1, characterized in that, The elevator (1) includes a column (101), a slide (102), a hopper (103), and a tilting guide rail (104). The slide (102) is mounted on the column (101), and a bushing (105) is mounted on the slide (102). A rotating shaft (106) is mounted on the hopper (103). The bushing (105) and the rotating shaft (106) are coaxially rotatably connected. A guide wheel (107) is mounted on the hopper (103). The tilting guide rail (104) is fixedly mounted on the column (101), and the guide wheel (107) is slidably mounted inside the tilting guide rail (104).

3. The grading and screening device for polycrystalline silicon ingots according to claim 2, characterized in that, It also includes a lifting motor (108) and a lifting synchronous belt (109). The lifting motor (108) is fixedly installed on the column (101), and the upper and lower ends of the lifting synchronous belt (109) are rotatably connected to the column (101). The slide (102) is fixedly connected to the lifting synchronous belt (109).

4. The grading and screening device for polycrystalline silicon ingots according to claim 1, characterized in that, The conveyor line (7) includes a first loading platform (701), a second loading platform (702), a third loading platform (703), a fourth loading platform (704), a turning platform (705), a conveying platform (706), a discharge platform (707), and a return platform (708). A turning platform (705) is provided at each end of the first loading platform (701), the second loading platform (702), the third loading platform (703), and the fourth loading platform (704). A conveying platform (706) is provided between two adjacent turning platforms (705). A discharge platform (707) and a return platform (708) are provided at both ends of the turning platforms (705) at both ends of the fourth loading platform (704).

5. The grading and screening device for polycrystalline silicon ingots according to claim 4, characterized in that, The first loading station (701), the second loading station (702), the third loading station (703) and the fourth loading station (704) each include a loading line (709) and a temporary storage line (710). A parking space is provided on the loading line (709) and 2-4 parking spaces are provided on the temporary storage line (710). Each parking space includes a first proximity sensor (711) and a second proximity sensor (712).

6. The grading and screening device for polycrystalline silicon ingots according to claim 5, characterized in that, The turntable (705) includes a base (7051), a conveying device (7052), a rotary cylinder (7053), a third proximity sensor (7054), and a fourth proximity sensor (7055). The rotary cylinder (7053) is fixedly installed on the base (7051). The rotating part of the rotary cylinder (7053) is connected to the bottom of the conveying device (7052). The third proximity sensor (7054) and the fourth proximity sensor (7055) are installed on the conveying device (7052).

7. The grading and screening device for polycrystalline silicon ingots according to claim 1, characterized in that, Vibrating feeders (10) are provided at the oversize outlet of the first-stage vibrating screen (2), the oversize outlet of the second-stage vibrating screen (3), the first discharge port (401) and the second discharge port (402) of the third-stage vibrating screen (4), and the oversize outlet and undersize outlet of the fourth-stage vibrating screen (5).

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