A cleaning and drying system and method for granular silicon materials

Abstract

This invention discloses a cleaning and drying system and method for granular silicon material, relating to the technical field of granular silicon material production equipment. It includes multiple cleaning mechanisms connected in sequence. Each cleaning mechanism includes a first support frame, a cleaning box for cleaning silicon material mounted on the top of the first support frame, an ultrasonic transducer installed inside the cleaning box, a first vibration motor mounted on the bottom of the cleaning box, an inlet pipe and an outlet pipe mounted on the cleaning box, a first water tank mounted on the first support frame, and a first water pump mounted on the first water tank. The multiple series-connected cleaning mechanisms perform water washing, ultrasonic cleaning, and vibration cleaning on the granular silicon material, effectively removing dust from the surface of the silicon material. Furthermore, the material flow direction is opposite to the cleaning liquid flow direction, which minimizes dust retention in the cleaning structure and thus improves the cleaning efficiency.

Description

Technical Field

[0001] This invention relates to the field of equipment technology for producing granular silicon material, and in particular to a system and method for cleaning and drying granular silicon material. Background Technology

[0002] Currently, both polycrystalline and monocrystalline silicon production in China employ crushing processes. However, after the crushing process, a certain percentage of small particles remain, which contain a lot of fine powder. To further utilize these small particles, it is necessary to remove the fine powder. Additionally, granular silicon produced using the silane fluidized bed method also generates a large amount of fine powder.

[0003] Currently, dust extraction and sieving are used to remove this fine powder from silicon material. However, sieving requires shaking the silicon material, but the vibration and collision between the sieve plate and the silicon material will further grind out a large amount of fine powder. Therefore, not only is the fine powder not completely removed from the silicon material, but further silicon material is also lost. Using vibrating sieving for dust extraction cannot completely prevent silicon material from being released into the air, which not only affects the environment but also causes great harm to human health. After washing, the silicon material needs to be dehumidified and dried for convenient subsequent storage. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a cleaning and drying system and method for granular silicon materials.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] A granular silicon material cleaning and drying system includes at least one cleaning unit for cleaning granular silicon material. Each cleaning unit includes multiple cleaning mechanisms connected in sequence. Each cleaning mechanism includes a first support frame, a cleaning box for cleaning silicon material is installed on the top of the first support frame, an ultrasonic transducer for cleaning silicon material is installed inside the cleaning box, a first vibration motor for driving silicon material to move from the feed end to the discharge end in the cleaning box is installed at the bottom of the cleaning box, an inlet pipe is installed on the side of the cleaning box near the discharge end, and a drain pipe that cooperates with the inlet pipe is installed on the side of the cleaning box near the feed end. A first water tank is installed on the first support frame, a first water pump for supplying water to the inlet pipe is installed on the first water tank, and the discharge end of the drain pipe is connected to the first water tank.

[0007] Furthermore, a material guide trough is installed inside the cleaning box, and the ultrasonic transducer is installed in the gap between the bottom of the material guide trough and the cleaning box. An inclined groove for blocking the flow of cleaning liquid to the discharge end of the material guide trough is installed, and a baffle is provided above the material guide trough and the baffle is fixed to the inner wall of the cleaning box.

[0008] Furthermore, each cleaning group is connected to a solid-liquid separation mechanism at its discharge end. The solid-liquid separation mechanism includes a second support frame, a solid-liquid separation box installed on the top of the second support frame, a filter plate installed inside the solid-liquid separation box, a second vibration motor installed at the bottom of the solid-liquid separation box, a second water tank installed at the bottom of the second support frame, and a guide pipe connected between the second water tank and the solid-liquid separation box.

[0009] Furthermore, the discharge end of the solid-liquid separation mechanism is connected to a preheating mechanism, which includes a preheating box. The preheating box is supported on the ground by a first support component. At least one preheating conveying pipe is inserted in the preheating box, and the horizontal height of the feed end of the preheating conveying pipe is greater than the horizontal height of its discharge end. Multiple first electric heating tubes for heating the preheating conveying pipe are installed in the preheating box. A first U-shaped bracket is set between two adjacent first electric heating tubes, and the preheating conveying pipe is inserted in the first U-shaped bracket. A first temperature sensor is installed in the preheating box.

[0010] Furthermore, a heating mechanism is installed at the discharge end of the preheating mechanism. The heating mechanism includes a heating box, which is supported on the ground by a second support component. At least one heating conveying pipe is inserted in the heating box. The horizontal height of the inlet end of the heating conveying pipe is greater than the horizontal height of its discharge end, and the inlet end of the heating conveying pipe is connected to the discharge end of the preheating conveying pipe. Multiple second electric heating tubes for heating the heating conveying pipe are installed in the heating box. A second U-shaped bracket is set between two adjacent second electric heating tubes, and the heating conveying pipe is inserted in the second U-shaped bracket. A second temperature sensor is installed in the heating box.

[0011] Furthermore, the discharge end of the heating mechanism is connected to a cooling mechanism, which includes a cooling box. The cooling box is supported on the ground by a third support component. At least one heat dissipation conveying pipe is inserted in the cooling box. The horizontal height of the inlet end of the heat dissipation conveying pipe is greater than the horizontal height of its discharge end, and the inlet end of the heat dissipation conveying pipe is connected to the discharge end of the heating conveying pipe. A circulating water pump that drives the flow of coolant in the cooling box is located on the side of the cooling box. An inlet valve and a drain valve are installed on the side of the cooling box. Circulation pipes are distributed inside the cooling box, and the two ends of the circulation pipes are respectively connected to the inlet valve and the drain valve.

[0012] Furthermore, the first support component, the second support component, and the third support component all include a base plate and a third support frame. Screws and threaded sleeves are provided at the four corners between the base plate and the third support frame. The top of the screw is connected to the bottom of the base plate through a hinge, and the bottom of the screw is inserted into the threaded sleeve that is threaded to it. The threaded sleeve is rotatably connected to the support frame.

[0013] Furthermore, a first drive motor is installed at the bottom of the base plate in the first support component, and the first drive motor drives the preheating conveying pipe to rotate on the preheating box through the first linkage component;

[0014] The bottom of the base plate in the second support component is equipped with a second drive motor, which drives the heating conveying pipe to rotate on the heating box through a second linkage component;

[0015] The bottom of the base plate in the third support component is equipped with a third drive motor, which drives the heat dissipation conveying pipe to rotate on the cooling box through the third linkage component.

[0016] The first linkage component, the second linkage component, and the third linkage component each include a main gear, a secondary gear, and a synchronous pulley. The main gear is connected to the shaft of the corresponding drive motor, the secondary gear is rotatably connected to the side of the corresponding housing, the synchronous pulley is fixedly installed on the side of the secondary gear, and the secondary gear is linked to the main gear through a chain.

[0017] Furthermore, the feed end of the preheating conveying pipe, the connection between the preheating conveying pipe and the heating conveying pipe, and the connection between the heating conveying pipe and the heat dissipation conveying pipe are all connected by pipe connection mechanisms. The pipe connection mechanism includes a connecting pipe, the bottom of which is connected to a support base. The support base is fixed to the corresponding base plate by fasteners. A second vent pipe is installed on the connecting pipe, and a third vent pipe that communicates with the cleaning box is connected to the second vent pipe.

[0018] Furthermore, a receiving mechanism is installed at the discharge end of the heat dissipation conveying pipe. The receiving mechanism includes a guide box, and a fourth support frame is connected to the bottom of the guide box. The fourth support frame is supported on the ground.

[0019] A method for cleaning and drying granular silicon material includes the following steps:

[0020] S1. The granular silicon material to be cleaned is cleaned by multiple cleaning mechanisms to obtain solid granular silicon material and cleaning liquid carrying dust.

[0021] S2. The obtained solid granular silicon material and the cleaning liquid carrying dust are separated by a solid-liquid separation mechanism to obtain solid granular silicon material.

[0022] S3. The obtained solid granular silicon material is placed in a preheating mechanism for preheating treatment at a preheating temperature of 300-500℃ to obtain preheated granular silicon material.

[0023] S5. Place the obtained preheated granular silicon material in a preheating mechanism for reheating treatment at a heating temperature of 800-900℃ to obtain dried granular silicon material.

[0024] S6. Place the dried granular silicon material in the cooling mechanism for cooling treatment, and after cooling to room temperature, it flows to the collection mechanism for collection.

[0025] The beneficial effects of this invention are:

[0026] 1) In this solution, two cleaning production lines for granular silicon materials are designed. Each line consists of multiple identical cleaning structures connected in series. The multiple connected cleaning mechanisms perform water washing, ultrasonic cleaning, and vibration cleaning on the granular silicon materials to remove dust from the surface of the silicon material. Furthermore, the material flow direction is opposite to the cleaning liquid flow direction, which can minimize dust retention in the cleaning structure and thus improve the cleaning efficiency of the cleaning structure.

[0027] 2) In this solution, a baffle is designed in the cleaning structure to ensure that the granular silicon material does not pile up, so that the height of the material accumulation is controllable, and also to ensure that the cleaning liquid contacts the surface of the granular silicon material to the maximum extent.

[0028] 3) In this solution, the designed solid-liquid separation mechanism replaces manual separation, and a preheating mechanism and a heating mechanism are designed to specifically dry the surface and interior of the silicon material after separation, thereby minimizing the moisture content in the silicon material.

[0029] 4) In this solution, a cooling mechanism is designed to dissipate heat and cool down the silicon material to accelerate its rapid cooling. The silicon material is then collected by a receiving mechanism, and the silicon material collected by the receiving mechanism only needs to be processed periodically.

[0030] 5) In this solution, in order to ensure the flow of granular silicon material in the pipe, in addition to designing the feed pipe to be tilted, a drive part is also designed to drive the feed pipe to rotate. By rotating the corresponding feed pipe, it can be ensured that the granular silicon material inside it is rolled, mixed evenly, and heated or cooled. It can also accelerate the flow of the internal silicon material and ensure that the silicon material in the feed pipe flows smoothly downward. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure;

[0032] Figure 2 for Figure 1 A three-dimensional structural diagram of the cleaning mechanism in the diagram;

[0033] Figure 3 for Figure 2 A top-view structural diagram;

[0034] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure at point AA;

[0035] Figure 5 for Figure 1 A three-dimensional structural diagram of the solid-liquid separation mechanism in the diagram;

[0036] Figure 6 for Figure 1 A schematic diagram of the three-dimensional structure of the preheating mechanism in the middle;

[0037] Figure 7 for Figure 6 A top-view structural diagram;

[0038] Figure 8 for Figure 1 A three-dimensional structural diagram of the heating mechanism in the diagram;

[0039] Figure 9 for Figure 8 Mid-top view of the structure;

[0040] Figure 10 for Figure 1 A three-dimensional structural diagram of the cooling mechanism in the middle;

[0041] Figure 11 for Figure 1 A three-dimensional structural diagram of the material receiving mechanism in the middle;

[0042] Figure 12 for Figure 8 A schematic diagram of the side structure;

[0043] Figure 13 This is a flowchart of the drying process after cleaning granular silicon material.

[0044] In the diagram, 100 is the cleaning mechanism; 101 is the first support frame; 102 is the cleaning box; 103 is the ultrasonic transducer; 104 is the first water tank; 105 is the first water pump; 106 is the feed chute; 107 is the inlet pipe; 108 is the outlet pipe; 109 is the baffle; 110 is the first vibration motor; 112 is the inclined chute; 200 is the solid-liquid separation mechanism; 201 is the second support frame; 202 is the solid-liquid separation box; 203 is the second vibration motor; 204 is the second water tank; 205 is the guide pipe; 300 is the preheating mechanism; 301 is the preheating box; 302 is the preheating conveying pipe; 303 is the first electric heating tube; 304 is the first U-shaped bracket; 305 is the first temperature sensor; 400 is the heating mechanism; 401 is the heating box; 4 02. Heated feed pipe; 403. Second electric heating tube; 404. Second U-shaped bracket; 405. Second temperature sensor; 500. Cooling mechanism; 501. Cooling box; 502. Heat dissipation feed pipe; 503. Circulating water pump; 504. Water inlet valve; 505. Drain valve; 600. Material receiving mechanism; 601. Guide box; 602. Fourth support frame; 700. Pipe connection mechanism; 701. Connecting pipe; 702. Support base; 704. Second vent pipe; 705. Third vent pipe; 8. Base plate; 9. Third support frame; 10. Screw; 11. Threaded sleeve; 12. First drive motor; 13. Second drive motor; 14. Third drive motor; 15. Main gear; 16. Secondary gear; 17. Synchronous pulley. Detailed Implementation

[0045] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. 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 skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] See Figures 1-13 The present invention provides a technical solution:

[0047] A granular silicon material cleaning and drying system includes at least one cleaning unit for cleaning granular silicon material. Each cleaning unit includes multiple cleaning mechanisms 100 connected in sequence. Each cleaning mechanism 100 includes a first support frame 101. A cleaning box 102 for cleaning silicon material is installed on the top of the first support frame 101. An ultrasonic transducer 103 for ultrasonic cleaning of silicon material is installed inside the cleaning box 102. A first vibration motor 110 for driving silicon material to move from the feed end to the discharge end in the cleaning box 102 is installed on the bottom of the cleaning box 102. An inlet pipe 107 is installed on the side of the cleaning box 102 near the discharge end. A drain pipe 108 that cooperates with the inlet pipe 107 is installed on the side of the cleaning box 102 near the feed end. A first water tank 104 is installed on the first support frame 101. A first water pump 105 for supplying water to the inlet pipe 107 is installed on the first water tank 104. The discharge end of the drain pipe 108 is connected to the first water tank 104.

[0048] In the above structure, to improve the overall production of granular silicon, a cleaning mechanism 100 is designed to replace the tedious manual cleaning steps. In addition, two cleaning production lines for granular silicon are designed, each consisting of multiple identical cleaning structures connected in series. The specific structure of each cleaning structure 100 is as follows:

[0049] The cleaning mechanism 100 includes a first support frame 101, a cleaning box 102, an ultrasonic transducer 103, a first water tank 104, a first water pump 105, a material guide trough 106, an inlet pipe 107, a drain pipe 108, a baffle 109, a first vibration motor 110, and an inclined trough 112. The upper right opening of the cleaning box 102 is the material inlet, and the left opening is the material outlet. An inlet pipe 107 is installed at the top of the cleaning box 102 near the material outlet and is connected to the first water pump 105. A drain pipe 108 is installed at one end of the cleaning box 102 near the material inlet, and the other end of the drain pipe 108 is connected to the first water tank 104.

[0050] During cleaning, the first water pump 105 draws the cleaning solution from the first water tank 104 into the cleaning box 102 through the inlet pipe 107. The solution flows from right to left within the cleaning box 102, eventually flowing into the left inlet pipe 107 and back into the water tank 104. Simultaneously, granular silicon material is introduced into the cleaning box 102 through the material inlet at the upper left opening. Under the vibration of the first vibration motor 110, the material continuously vibrates and moves from right to left until it exits through the material outlet at the right side opening of the cleaning box 102, thus ending this stage of material cleaning and flow. During this cleaning process, the granular silicon material flows from right to left in the cleaning box 102, while the cleaning liquid flows from left to right in the cleaning box 102. Therefore, after removing the dust attached to the surface of the granular silicon material, it will flow into the first water tank 104 along with the cleaning liquid. Subsequently, it is only necessary to replace the cleaning liquid in the first water tank 104 periodically. Since the cleaning production line is composed of multiple cleaning mechanisms 100 connected in series, it avoids the dust flowing into the next adjacent cleaning mechanism after being cleaned by the previous cleaning mechanism, thus minimizing the possibility of dust remaining in the cleaning channel for a long time.

[0051] In addition, each of the two cleaning lines in this solution is designed with three cleaning mechanisms 100, which are connected in series to form a whole. However, it is not limited to setting up three cleaning mechanisms 100. In other implementations, the number can be selected according to actual needs.

[0052] In addition, to increase the efficiency of dust removal from the surface of granular silicon material, the following improvements were made to the cleaning process:

[0053] A guide trough 106 is installed inside the cleaning box 102. An ultrasonic transducer 103 is installed in the gap between the bottom of the guide trough 106 and the cleaning box 102. An inclined groove 112 for blocking the flow of cleaning liquid to the discharge end is installed at the discharge end of the guide trough 106. A baffle 109 is provided above the guide trough 106 and is fixed to the inner wall of the cleaning box 102.

[0054] The material guide trough 106 separates the interior of the cleaning box 102. An ultrasonic transducer 103 is installed in the area between the bottom of the cleaning box 102 and the material guide trough 106. Multiple ultrasonic transducers 103 are arranged in a matrix. The subsequent multiple ultrasonic transducers 103 are connected to an external ultrasonic power supply. Controlling the ultrasonic power supply can complete the ultrasonic cleaning operation. In addition, in order to prevent the cleaning liquid from flowing into the next adjacent cleaning box, an inclined trough 112 is designed. The inclined trough 112 is located at the discharge end of the material guide trough 106. The inclined trough 112 is used to block the cleaning liquid from flowing into the next cleaning box. Furthermore, in order to ensure that the granular silicon material does not pile up, a baffle 109 is designed to flatten the flowing granular silicon material, so that the height of the material accumulation is controllable and the cleaning liquid can contact the surface of the granular silicon material to the maximum extent.

[0055] After the cleaning line is cleaned, the granular silicon material collected at its end and the cleaning liquid containing dust need to be separated. Therefore, a solid-liquid separation mechanism 200 is designed. The solid-liquid separation mechanism 200 is connected to the discharge end of the cleaning mechanism 100 at the end of each cleaning group.

[0056] The solid-liquid separation mechanism 200 includes a second support frame 201, a solid-liquid separation box 202 is installed on the top of the second support frame 201, a filter plate is installed inside the solid-liquid separation box 202, a second vibration motor 203 is installed at the bottom of the solid-liquid separation box 202, a second water tank 204 is installed at the bottom of the second support frame 201, and a guide pipe 205 connects the second water tank 204 and the solid-liquid separation box 202.

[0057] A filter plate is installed in the solid-liquid separation box 202. The granular silicon material and the cleaning liquid carried in the end cleaning box 102 enter the filter plate of the solid-liquid separation box 202 for solid-liquid separation. The liquid enters the second water tank 204 through the guide pipe 205. The granular silicon material that does not pass through the filter plate moves towards the discharge end in the solid-liquid separation box 202 under the vibration of the second vibration motor 203. A spray device can be installed on the cleaning box 102 to wash away the dust from the granular silicon material.

[0058] After solid-liquid separation, the water stains on the surface of the granular silicon material need to be dried; therefore, a preheating mechanism 300 is designed. Thus, the preheating mechanism 300 is connected to the discharge end of the solid-liquid separation mechanism 200. The specific structure and connection of the preheating mechanism 300 are as follows:

[0059] The preheating mechanism 300 includes a preheating box 301, which is supported on the ground by a first support member. At least one preheating conveying pipe 302 is inserted in the preheating box 301, and the horizontal height of the feed end of the preheating conveying pipe 302 is greater than the horizontal height of its discharge end. Multiple first electric heating tubes 303 for heating the preheating conveying pipes 302 are installed in the preheating box 301. A first U-shaped bracket 304 is set between two adjacent first electric heating tubes 303, and the preheating conveying pipes 302 are inserted in the first U-shaped brackets 304. A first temperature sensor 305 is installed in the preheating box 301.

[0060] Three preheating conveying pipes 302 are provided, and all three preheating conveying pipes 302 are inserted at both ends of the preheating box 301. In order to ensure that the granular silicon material moves in the preheating conveying pipes 302, the height of the feed end of the preheating conveying pipe 302 is selected to be greater than its discharge height, so as to achieve the purpose of smooth discharge. Multiple first electric heating tubes 303 are fixed in the preheating box 301, and a first U-shaped bracket 304 is installed between two adjacent first electric heating tubes 303. The two first electric heating tubes 303 on the left and right can release heat simultaneously to heat up the first U-shaped bracket 304. After the first U-shaped bracket 304 is heated, it surrounds the preheating conveying pipe 302 to achieve the purpose of uniform heating of the preheating conveying pipe 302.

[0061] The preheating box 301 is heated by multiple first electric heating tubes 303, which in turn heat the first U-shaped support 304. The preheating conveying pipe 302 is inserted in the first U-shaped support 304. Therefore, the heated first U-shaped support 304 conducts heat to the surface of the preheating conveying pipe 302, thereby heating the granular silicon material in the preheating conveying pipe 302 and evaporating the water stains attached to the surface of the granular silicon material.

[0062] Since the preheating mechanism 300 mentioned above requires further high-temperature heating treatment after preheating the granular silicon material, a heating mechanism 400 with a different temperature from the preheating temperature was designed. The specific structure and connection of the heating mechanism 400 are as follows:

[0063] A heating mechanism 400 is installed at the discharge end of the preheating mechanism 300. The heating mechanism 400 includes a heating box 401, which is supported on the ground by a second support component. At least one heating conveying pipe 402 is inserted in the heating box 401. The horizontal height of the feed end of the heating conveying pipe 402 is greater than the horizontal height of its discharge end, and the feed end of the heating conveying pipe 402 is connected to the discharge end of the preheating conveying pipe 302. Multiple second electric heating tubes 403 for heating the heating conveying pipes 402 are installed in the heating box 401. A second U-shaped bracket 404 is set between two adjacent second electric heating tubes 403, and the heating conveying pipes 402 are inserted in the second U-shaped brackets 404. A second temperature sensor 405 is installed in the heating box 401.

[0064] The heating chamber 401 is supported by a second support component. Multiple heating conveying pipes 402 are inserted within the heating chamber 401. The number of heating conveying pipes 402 is equal to the number of preheating conveying pipes 302, and each heating conveying pipe 402 is connected to a preheating conveying pipe 302. The horizontal height of the feed end of the heating conveying pipe 402 is greater than the horizontal height of its discharge end, and the feed end of the heating conveying pipe 402 is connected to the discharge end of the preheating conveying pipe 302. This allows the granular silicon material to be preheated before entering a higher-temperature space for further heating. During the heating process, the second electric heating tube 403 is heated, while the first heating tube 402, which is fixed inside the heating chamber 401, is heated. Two U-shaped supports 404 surround the heating feed pipe 402, and one second U-shaped support 404 is installed between every two second electric heating pipes 403. The second U-shaped supports 404 have three purposes: First, they can separate two adjacent second electric heating pipes 403; second, the second U-shaped supports 404 are located on the middle heating feed pipe among the three heating feed pipes, which can separate the three heating feed pipes; third, the heat released by two adjacent second electric heating pipes 403 can heat the same second U-shaped support 404, and the efficiency of the second U-shaped support 404 in heating the granular silicon material inside the heating feed pipe by heat conduction is higher.

[0065] Since the heating mechanism 400 needs to cool the granular silicon material after heating it to return it to room temperature, the cooling mechanism 500 has been improved. The specific structure is as follows:

[0066] The discharge end of the heating mechanism 400 is connected to a cooling mechanism 500. The cooling mechanism 500 includes a cooling box 501, which is supported on the ground by a third support component. At least one heat dissipation conveying pipe 502 is inserted in the cooling box 501. The horizontal height of the inlet end of the heat dissipation conveying pipe 502 is greater than the horizontal height of its discharge end, and the inlet end of the heat dissipation conveying pipe 502 is connected to the discharge end of the heating conveying pipe 402. A circulating water pump 503 drives the flow of coolant in the cooling box 501 from the side. An inlet valve 504 and a drain valve 505 are installed on the side of the cooling box 501. Circulation pipes are distributed inside the cooling box 501, and the two ends of the circulation pipes are connected to the inlet valve 504 and the drain valve 505, respectively.

[0067] During cooling, an external water inlet pipe is connected to the water inlet valve 504, and an external drain pipe is connected to the drain valve 505. The external coolant enters the circulation pipe in the cooling tank 501 through the water inlet valve 504, and then enters the drain pipe through the drain valve 505. In this way, the heat in the silicon material is transferred. Alternatively, the coolant can be discharged into the cooling tank 501. In order to increase the fluidity of the coolant, a circulating water pump 503 is connected to the side of the cooling tank 501. The inlet and outlet of the circulating water pump 503 have a certain height difference to accelerate the working efficiency of the internal cooling medium.

[0068] The first support component, the second support component, and the third support component all include a base plate 8 and a third support frame 9. Screws 10 and threaded sleeves 11 are provided at the four corners between the base plate 8 and the third support frame 9. The top of the screw 10 is connected to the bottom of the base plate 8 through a hinge, and the bottom of the screw 10 is inserted into the threaded sleeve 11 that is threaded to it. The threaded sleeve 11 is rotatably connected to the support frame.

[0069] The preheating box 301, heating box 401 and cooling box 501 are provided with certain support, and their height can be adjusted according to actual needs to ensure that the feed end of the entire pipeline for the flow of granular silicon material is always higher than the discharge end, so that the material flows smoothly downward. Therefore, the above three support components are designed with adjustable height.

[0070] The base plate 8 is supported on the ground by the third support frame 9. The connection between the base plate 8 and the third support frame 9 is designed with a threaded screw 10 and a threaded sleeve 11. The top of the screw 10 is fixed to the bottom of the base plate 8 by a hinge seat, which can meet the overall angle change. The screw 10 and the base plate 8 can rotate, while the threaded sleeve 11 is rotatably connected to the third support frame 9.

[0071] To ensure the flow of granular silicon material within the tube, the following structure is designed to drive the tube to rotate. By rotating the corresponding tube, the granular silicon material inside is ensured to tumble, mix evenly, and be heated or cooled.

[0072] A drive mechanism was designed for the rotation of the preheating conveying pipe. The specific structure and connection of the drive mechanism are as follows:

[0073] The bottom of the base plate in the first support component is equipped with a first drive motor 12. The first drive motor 12 drives the preheating conveying pipe 302 to rotate on the preheating box 301 through the first linkage component.

[0074] A drive mechanism is designed for the rotation of the heated feed pipe. The specific structure and connection of the drive mechanism are as follows:

[0075] The bottom of the base plate in the second support component is equipped with a second drive motor 13. The second drive motor 13 drives the heating conveying pipe 402 to rotate on the heating box 401 through the second linkage component.

[0076] A drive mechanism is designed for the rotation of the heat dissipation pipe. The specific structure and connection of the drive mechanism are as follows:

[0077] The bottom of the base plate in the third support component is equipped with a third drive motor 14. The third drive motor 14 drives the heat dissipation conveying pipe 502 to rotate on the cooling box 501 through the third linkage component.

[0078] The first, second, and third linkage components mentioned above all include a main gear 15, a secondary gear 16, and a synchronous pulley 17. The main gear 15 is connected to the shaft of the corresponding drive motor, the secondary gear 16 is rotatably connected to the side of the corresponding housing, and the synchronous pulley 17 is fixedly installed on the side of the secondary gear 16. The secondary gear 16 is linked to the main gear 15 through a chain.

[0079] In use, the corresponding drive motor drives the corresponding main gear 15 to rotate, while the secondary gear 16 is linked to the main gear 15 through a chain. The synchronous wheel 17 can rotate together with the secondary gear 16 on the side of the box. The synchronous wheel 17 contacts the corresponding material conveying pipe to push the corresponding material conveying pipe to rotate on the corresponding box.

[0080] The discharge end of the preheating conveying pipe 302 is inserted into the inlet end of the heating conveying pipe 402, and the discharge end of the heating conveying pipe 402 is inserted into the inlet end of the heat dissipation conveying pipe 502. To ensure that the granular silicon material can smoothly enter the next process between the various conveying pipes, a pipe connection mechanism 700 is designed.

[0081] Pipe connection mechanisms 700 are connected to the feed end of the preheating conveying pipe 302, between the preheating conveying pipe 302 and the heating conveying pipe 402, and between the heating conveying pipe 402 and the heat dissipation conveying pipe 502. The pipe connection mechanism 700 includes a connecting pipe 701. A support base 702 is connected to the bottom of the connecting pipe 701. The support base 702 is fixed to the corresponding base plate 8 by fasteners. A second vent pipe 704 is installed on the connecting pipe 701. A third vent pipe 705 that communicates with the cleaning box 102 is connected to the second vent pipe 704.

[0082] The connecting pipe 701 is distributed between two adjacent conveying pipes at the front and rear workstations. The connecting pipe 701 is sleeved on the two adjacent conveying pipes, and a support base 702 is fixed at the bottom of the connecting pipe 701. The support base 702 is fixed to the corresponding base plate 8 with bolts and nuts. The connecting pipe 701 connects the two adjacent conveying pipes and allows them to vent to each other. A second vent pipe 704 is installed on the connecting pipe 701. The second vent pipe 704 is connected to the nitrogen inside the cleaning box 102 through a third vent pipe 705. Subsequently, the moisture in the conveying pipes enters the cleaning box 102 in sequence through the connecting pipe 701, the second vent pipe 704 and the third vent pipe 705, so as to discharge the moisture in the preheating, heating and cooling processes into the cleaning box 102.

[0083] To prevent air from contaminating the granular silicon material during processing, nitrogen is pre-filled into the equipment before use to purge the internal air.

[0084] Finally, a receiving mechanism 600 is installed at the discharge end of the heat dissipation conveying pipe 502. The receiving mechanism 600 includes a guide box 601, and a fourth support frame 602 is connected to the bottom of the guide box 601. The fourth support frame 602 is supported on the ground.

[0085] Below the three heat dissipation conveying pipes 502, a collection device for collecting granular silicon material after processing is installed at the corresponding location. The fourth support frame 602 is installed below the guide box 601, and the guide box 601 is supported on the ground by the fourth support frame 602.

[0086] A method for cleaning and drying granular silicon material includes the following steps:

[0087] S1. The granular silicon material to be cleaned is cleaned by multiple cleaning units 100 to obtain solid granular silicon material and cleaning liquid carrying dust.

[0088] Multiple cleaning mechanisms 100 are connected end to end. The ultrasonic transducer 103, the first water pump 105 and the first vibration motor 110 in the cleaning mechanism 100 are started. The ultrasonic transducer 103 releases ultrasonic vibration cleaning fluid to clean the silicon material. The first water pump 105 draws the liquid in the first water tank 104 into the cleaning box 102 and continuously flows to the right. Then it enters the drain pipe 108 and flows back to the first water tank 104. The first vibration motor 110 moves the silicon material from right to left in the cleaning box 102 and enters the next cleaning mechanism 100 to repeat the above cleaning process.

[0089] S2. The obtained solid granular silicon material and the cleaning liquid carrying dust are separated by a solid-liquid separation mechanism 200 to obtain solid granular silicon material.

[0090] Under the vibration of the second vibration motor 203, the solid-liquid separation mechanism 200 drives the granular silicon material in the solid-liquid separation box 202 to move towards the discharge port on the filter plate. Under the vibration, in addition to pushing the silicon material forward, it can also shake off the water droplets attached to the silicon material and filter out the cleaning liquid. The cleaning liquid flows into the second water tank 204 for collection through the guide pipe 205.

[0091] S3. The obtained solid granular silicon material is placed in the preheating mechanism 300 for preheating treatment at a preheating temperature of 300-500℃ to obtain preheated granular silicon material.

[0092] Multiple first electric heating tubes 303 in the preheating mechanism 300 heat the environment inside the first U-shaped support 304 and the preheating box 301, and the silicon material in the preheating conveying pipe 302 is heated to eliminate water stains on the surface of the silicon material; and the initial heating of the silicon material is completed. In order to cope with this temperature range, a temperature sensor can be installed in the preheating box 301 to monitor the temperature change in real time, and an external controller can be used to control the number of first electric heating tubes 303.

[0093] S5. The preheated granular silicon material is placed in the preheating mechanism 400 for reheating treatment at a temperature of 800-900℃ to obtain dried granular silicon material.

[0094] The heating chamber 401 is equipped with multiple second electric heating tubes 403 for heating the heating conveying pipe 402. The required internal temperature is controlled by turning on the number of second electric heating tubes 403, and a second temperature sensor 405 is installed to monitor the internal temperature at any time. This temperature range can eliminate moisture inside the granular silicon material to the greatest extent.

[0095] S6. Place the dried granular silicon material in the cooling mechanism for cooling treatment, and after cooling to room temperature, it flows to the collection mechanism for collection.

[0096] The cooling mechanism employs the following cooling method: During cooling, an external water inlet pipe is connected to the water inlet valve 504, and an external drain pipe is connected to the drain valve 505. The external coolant enters the circulation pipe in the cooling tank 501 through the water inlet valve 504, and then enters the drain pipe through the drain valve 505. In this way, the heat in the silicon material is transferred.

[0097] It is worth noting that in this scheme, nitrogen can be introduced into the discharge end of the conveying pipe to expel the internal air and reduce the impact of airborne particles and moisture on the raw materials. In addition to motor vibration, the first vibration motor 110 and the second vibration motor 203 mentioned above can also use other vibration equipment to complete the vibration feeding process, such as electromagnetic vibrators, vibrating rods, NTS vibrators, etc. Furthermore, three cleaning mechanisms 100 are designed in each cleaning line, and the three cleaning mechanisms 100 are connected in series as a whole. However, it is not limited to the three cleaning mechanisms 100. In other embodiments, the number can be selected according to actual needs.

[0098] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "hinged," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0099] The above description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A cleaning and drying system for granular silicon material, characterized in that: The system includes at least one cleaning unit for cleaning granular silicon material. Each cleaning unit includes multiple cleaning mechanisms (100) connected in sequence. Each cleaning mechanism (100) includes a first support frame (101). A cleaning box (102) for cleaning silicon material is installed on the top of the first support frame (101). An ultrasonic transducer (103) for cleaning silicon material is installed inside the cleaning box (102). A third device for driving the silicon material to move from the feed end to the discharge end in the cleaning box (102) is installed at the bottom of the cleaning box (102). A vibration motor (110) is provided. An inlet pipe (107) is installed on the side of the cleaning box (102) near the discharge end. A drain pipe (108) that cooperates with the inlet pipe (107) is installed on the side of the cleaning box (102) near the feed end. A first water tank (104) is installed on the first support frame (101). A first water pump (105) for supplying water to the inlet pipe (107) is installed on the first water tank (104). The discharge end of the drain pipe (108) is connected to the first water tank (104). The cleaning box (102) is equipped with a material guide trough (106), and the ultrasonic transducer (103) is installed in the gap between the bottom of the material guide trough (106) and the cleaning box (102). The discharge end of the material guide trough (106) is equipped with an inclined groove (112) to block the flow of cleaning liquid to the discharge end. A baffle (109) is provided above the material guide trough (106), and the baffle (109) is fixed on the inner wall of the cleaning box (102). Each cleaning unit is connected to a solid-liquid separation mechanism (200) at its discharge end. The solid-liquid separation mechanism (200) includes a second support frame (201), a solid-liquid separation box (202) is installed on the top of the second support frame (201), a filter plate is installed inside the solid-liquid separation box (202), a second vibration motor (203) is installed at the bottom of the solid-liquid separation box (202), a second water tank (204) is installed at the bottom of the second support frame (201), and a guide pipe (205) is connected between the second water tank (204) and the solid-liquid separation box (202). The discharge end of the solid-liquid separation mechanism (200) is connected to a preheating mechanism (300). The preheating mechanism (300) includes a preheating box (301), which is supported on the ground by a first support component. At least one preheating conveying pipe (302) is inserted in the preheating box (301), and the horizontal height of the feed end of the preheating conveying pipe (302) is greater than the horizontal height of its discharge end. The discharge end of the preheating mechanism (300) is equipped with a heating mechanism (400), which includes a heating box (401). The heating box (401) is supported on the ground by a second support component. At least one heating conveying pipe (402) is inserted in the heating box (401), and the horizontal height of the feed end of the heating conveying pipe (402) is greater than the horizontal height of its discharge end. The feed end of the heating conveying pipe (402) is connected to the discharge end of the preheating conveying pipe (302).

2. The granular silicon material cleaning and drying system according to claim 1, characterized in that: The preheating box (301) is equipped with multiple first electric heating tubes (303) for heating the preheating conveying pipe (302). A first U-shaped bracket (304) is provided between two adjacent first electric heating tubes (303), and the preheating conveying pipe (302) is inserted in the first U-shaped bracket (304). A first temperature sensor (305) is installed in the preheating box (301).

3. The granular silicon material cleaning and drying system according to claim 2, characterized in that: The heating box (401) is equipped with multiple second electric heating tubes (403) for heating the heating conveying pipe (402). A second U-shaped bracket (404) is provided between two adjacent second electric heating tubes (403), and the heating conveying pipe (402) is inserted into the second U-shaped bracket (404). A second temperature sensor (405) is installed in the heating box (401).

4. The granular silicon material cleaning and drying system according to claim 3, characterized in that: The discharge end of the heating mechanism (400) is connected to a cooling mechanism (500). The cooling mechanism (500) includes a cooling box (501). The cooling box (501) is supported on the ground by a third support component. At least one heat dissipation conveying pipe (502) is inserted in the cooling box (501). The horizontal height of the inlet end of the heat dissipation conveying pipe (502) is greater than the horizontal height of its discharge end. The inlet end of the heat dissipation conveying pipe (502) is connected to the discharge end of the heating conveying pipe (402). A circulating water pump (503) for driving the flow of coolant in the cooling box (501) is installed on the side of the cooling box (501). An inlet valve (504) and a drain valve (505) are installed on the side of the cooling box (501). Circulating pipes are distributed inside the cooling box (501). The two ends of the circulating pipes are connected to the inlet valve (504) and the drain valve (505) respectively.

5. The granular silicon material cleaning and drying system according to claim 4, characterized in that: The first support component, the second support component, and the third support component all include a base plate (8) and a third support frame (9). Screws (10) and threaded sleeves (11) are provided at the four corners between the base plate (8) and the third support frame (9). The top of the screw (10) is connected to the bottom of the base plate (8) through a hinge. The bottom of the screw (10) is inserted into the threaded sleeve (11) that is threaded to it. The threaded sleeve (11) is rotatably connected to the third support frame.

6. The granular silicon material cleaning and drying system according to claim 5, characterized in that: The bottom of the base plate in the first support component is equipped with a first drive motor (12), and the first drive motor (12) drives the preheating conveying pipe (302) to rotate on the preheating box (301) through the first linkage component; The bottom of the base plate in the second support component is equipped with a second drive motor (13), which drives the heating conveying pipe (402) to rotate on the heating box (401) through the second linkage component; The bottom of the base plate in the third support component is equipped with a third drive motor (14), which drives the heat dissipation conveying pipe (502) to rotate on the cooling box (501) through the third linkage component; The first linkage component, the second linkage component and the third linkage component all include a main gear (15), a secondary gear (16) and a synchronous pulley (17). The main gear (15) is connected to the shaft of the corresponding drive motor. The secondary gear (16) is rotatably connected to the side of the corresponding housing. The synchronous pulley (17) is fixedly installed on the side of the secondary gear (16). The secondary gear (16) is linked to the main gear (15) through a chain.

7. The granular silicon material cleaning and drying system according to claim 6, characterized in that: The feed end of the preheating feed pipe (302), the preheating feed pipe (302) and the heating feed pipe (402), and the heating feed pipe (402) and the heat dissipation feed pipe (502) are all connected by pipe connection mechanisms (700). The pipe connection mechanism (700) includes a connecting pipe (701). The bottom of the connecting pipe (701) is connected to a support base (702). The support base (702) is fixed to the corresponding base plate (8) by fasteners. A second vent pipe (704) is installed on the connecting pipe (701). A third vent pipe (705) that communicates with the cleaning box (102) is connected to the second vent pipe (704).

8. A method for cleaning and drying granular silicon material, using the granular silicon material cleaning and drying system as described in any one of claims 4-7, characterized in that, Includes the following steps: S1. The granular silicon material to be cleaned is cleaned by multiple cleaning mechanisms to obtain solid granular silicon material and cleaning liquid carrying dust. S2. The obtained solid granular silicon material and the cleaning liquid carrying dust are separated by a solid-liquid separation mechanism to obtain solid granular silicon material. S3. The obtained solid granular silicon material is placed in a preheating mechanism for preheating treatment at a preheating temperature of 300~500℃ to obtain preheated granular silicon material. S4. Place the obtained preheated granular silicon material in a preheating mechanism for reheating treatment at a heating temperature of 800~900℃ to obtain dried granular silicon material. S5. Place the dried granular silicon material in the cooling mechanism for cooling treatment. After cooling to room temperature, it flows to the collection mechanism for collection.

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