An apparatus for producing silicon fine powder

Abstract

The utility model relates to the technical field of silicon micro powder production equipment, concretely to a kind of equipment for producing silicon micro powder, including horizontally arranged outer cylinder, and the outer wall of outer cylinder is equipped with heating assembly, and the hardness of silicon material is reduced by heating assembly heating, and silicon material structure becomes loose, so that silicon material is more easily ground by grinding ball grinding. Inner sieve cylinder is coaxially arranged in outer cylinder, and a plurality of grinding balls are arranged in inner sieve cylinder, and driving mechanism is arranged at one end of inner sieve cylinder, and driving mechanism drives inner sieve cylinder to rotate along central axis, and grinding limiting piece is arranged along inner wall of inner sieve cylinder, and inner sieve cylinder is driven to rotate along central axis by driving mechanism, and grinding ball is lifted to the top of inner sieve cylinder under the block of grinding limiting piece, and then falls, and gravitational potential energy is converted into kinetic energy, so that the relative motion of silicon material is more complex, and grinding is uniform. A plurality of sieve holes are arranged in inner sieve cylinder away from grinding limiting piece, and silicon material particles are discharged from inner sieve cylinder through sieve holes, and grinding efficiency is greatly improved.

Description

Technical Field

[0001] This utility model relates to the technical field of silicon micropowder production equipment, specifically to a device for producing silicon micropowder. Background Technology

[0002] Currently, the application of silicon micropowder is mainly concentrated in the electronics and chemical industries, but it is expanding to other high-end application areas (such as aerospace and new energy).

[0003] The production of silicon micro powder requires high-purity quartz sand as raw material. However, in the process of further refining silicon material, it must go through multiple processes to obtain particles of the target size and then be classified and screened.

[0004] In the process of silicon grinding, traditional grinding is carried out by grinding discs, which is slow and has low processing speed. Ball milling is also used, but the silicon particles are uneven during grinding, and the silicon is too hard or sticks together, so it cannot be ground completely. The ground silicon powder needs to be screened in the next process. Particles that do not meet the size requirements are separated and sent to the next grinding equipment for grinding and screening again until they are completely ground to the target particle size. The grinding process is complicated, the grinding equipment occupies a lot of space, and the grinding efficiency is low. Summary of the Invention

[0005] The purpose of this invention is to provide a device for producing silicon micro powder to solve the problems mentioned in the background art. This invention achieves the advantages of more thorough grinding by using an inner sieve cylinder and grinding balls to fully grind the powder and then sieve it through the sieve holes. Heating is carried out during the grinding process to reduce the hardness of the silicon micro powder.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A device for producing silicon micro powder includes a horizontally arranged outer cylinder, a heating component on the outer wall of the outer cylinder, an inner sieve cylinder coaxially arranged inside the outer cylinder, a plurality of grinding balls inside the inner sieve cylinder, a driving mechanism at one end of the inner sieve cylinder, the driving mechanism driving the inner sieve cylinder to rotate along the central axis, a grinding limiting component on the inner wall of the inner sieve cylinder, a plurality of sieve holes avoiding the grinding limiting component, and a feeding port at the end of the inner sieve cylinder away from the driving mechanism, with a feeding component at the feeding port.

[0007] The heating element reduces the hardness of the silicon material, making its structure looser and reducing the grinding resistance between the grinding balls and the silicon material, thus making it easier for the grinding balls to grind the silicon. The inner screen cylinder is driven by a drive mechanism to rotate along its central axis. The grinding balls continuously tumble and move within the inner screen cylinder. Under the obstruction of the grinding limiters, the grinding balls rise to the top of the inner screen cylinder and then fall. Gravitational potential energy is converted into kinetic energy, making the relative motion of the silicon material more complex and resulting in more uniform grinding.

[0008] The silicon particles are ground to a certain fineness and discharged from the inner sieve cylinder through the sieve holes. The silicon particles that have not reached the grinding precision are ground again, which more effectively concentrates the silicon particles in the area that needs to be ground, greatly improving the grinding efficiency.

[0009] As a further embodiment of this invention, the bottom of the outer cylinder is provided with an outlet on the side away from the inlet. The outlet is a conical discharge cylinder with a wide opening facing downwards. The ground silicon micropowder is sieved through the sieve holes and discharged through the outlet. A transfer assembly is located directly below the conical discharge cylinder. The downward-facing conical discharge cylinder allows the ground silicon micropowder to be discharged more smoothly under gravity and is promptly transferred and conveyed by the transfer assembly.

[0010] As a further embodiment of this utility model, the material transfer assembly includes a conveyor belt that is inclined in the discharge direction, with the top end of the conveyor belt wound around the driven wheel and the bottom end of the conveyor belt wound around the driving wheel, and a conveyor motor connected to the side of the driving wheel.

[0011] After the silicon material is discharged from the conical discharge cylinder, it falls directly onto the inclined conveyor belt. The conveyor belt is inclined in the direction of discharge to make full use of gravity and accelerate forward movement with the help of gravity, reducing the burden on the conveyor motor. This makes the milled silicon powder smoother during the conveying process, avoids silicon material accumulation and waiting time, and improves the continuity of production.

[0012] As a further embodiment of this invention, the grinding limiting component includes grinding limiting plates arranged radially around the axis of the inner sieve cylinder. These grinding limiting plates are evenly distributed circumferentially, with their width direction aligned with their radius direction. The width of the grinding limiting plates is greater than the diameter of the grinding balls. When the inner sieve cylinder rotates to its lowest position, the grinding balls fall into the space between the two grinding limiting plates. After being blocked, the grinding balls rotate with the inner sieve cylinder to a higher position, where they slide down under gravity. The gravitational potential energy of the grinding balls is converted into kinetic energy, impacting and vibrating the silicon material to achieve grinding.

[0013] As a further embodiment of this invention, the sieve aperture diameter is set to the diameter of the silicon micropowder particles being discharged. Silicon micropowder particles with a diameter less than or equal to the sieve aperture diameter fall through the aperture. By setting the sieve aperture diameter to the diameter of the silicon micropowder particles being discharged, it is ensured that only silicon micropowder meeting the target particle size can pass through the sieve aperture and be discharged. Matching the sieve aperture diameter with the silicon micropowder particle diameter effectively classifies the silicon material. Particles that do not meet the particle size requirements (such as larger particles) cannot pass through the sieve aperture and are thus retained in the inner sieve cylinder for further grinding until they reach the target particle size before being discharged. This classification mechanism improves the quality stability of the product.

[0014] As a further embodiment of this utility model, the outer cylinder and the inner screen cylinder are respectively provided with a first bearing assembly and a second bearing assembly at both ends. The first bearing assembly is located on the side of the drive motor, and the second bearing assembly is located on the side of the feed inlet. The first bearing assembly includes a first bearing, the outer ring of the first bearing is fixedly set with the outer cylinder, and the inner ring of the first bearing is fitted with the end shaft of the inner screen cylinder. The end shaft is driven to rotate synchronously by a drive mechanism.

[0015] As a further embodiment of this utility model, the second bearing assembly includes a second bearing, the outer ring of the second bearing is fixedly disposed with the outer cylinder, and the inner ring of the second bearing is fitted with the feed mounting cylinder at the end of the inner screen cylinder; the inner screen cylinder can maintain precise coaxiality during rotation, reducing vibration and shaking.

[0016] As a further embodiment of this invention, the feeding assembly includes a feeding cone with an upward-facing opening. The lower opening of the feeding cone is horizontally positioned, and an inner feeding tube is provided at the lower opening. The inner feeding tube extends through the feed mounting cylinder and into the inner screen cylinder. Several supporting ribs are provided circumferentially between the inner feeding tube and the feed mounting cylinder. The feeding cone has an upward-facing opening and is conical in shape, allowing the silicon material to fall smoothly under gravity, reducing the accumulation and blockage of silicon material at the feeding port, and improving feeding efficiency.

[0017] As a further embodiment of this utility model, the driving mechanism includes a drive motor, and a synchronous belt is wound between the drive motor shaft and the end rotating shaft.

[0018] As a further embodiment of this utility model, the heating assembly includes a plurality of graphite heaters evenly distributed along the outer surface of the outer cylinder, the graphite heaters being disposed close to the outer cylinder and electrically connected to an external power source.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows: This equipment for producing silicon micropowder includes a horizontally arranged outer cylinder. A heating component is provided on the outer wall of the outer cylinder. The heating component heats and reduces the hardness of the silicon material, making its structure looser and reducing the grinding resistance between the grinding balls and the silicon material, thus making the silicon material easier to grind. An inner sieve cylinder is coaxially arranged within the outer cylinder. Several grinding balls are located within the inner sieve cylinder. A driving mechanism is provided at one end of the inner sieve cylinder, driving it to rotate along its central axis. Grinding limiting components are provided along the inner wall of the inner sieve cylinder. Driven by the driving mechanism, the inner sieve cylinder rotates along its central axis, causing the grinding balls to continuously tumble and move within the inner sieve cylinder. Blocked by the grinding limiting components, the grinding balls rise to the top of the inner sieve cylinder and then fall back down. Gravitational potential energy is converted into kinetic energy, making the relative motion of the silicon material more complex and resulting in more uniform grinding.

[0020] The inner screen cylinder has several rows of screen holes that avoid the grinding limit components. The silicon particles are ground to a certain fineness and then discharged from the inner screen cylinder through the screen holes. The silicon particles that have not reached the grinding precision are ground again, which more effectively concentrates the silicon particles in the area that needs to be ground, greatly improving the grinding efficiency. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is the front view of the present invention; Figure 3 This is a cross-sectional view of the inner screen cylinder of this utility model; Figure 4 This is a schematic diagram of the end shaft mounting structure of this utility model; Figure 5 This is a schematic diagram of the feeding installation cylinder installation structure of this utility model.

[0022] In the figure: 1-outer cylinder, 2-heating component, 201-graphite heater, 3-conical discharge cylinder, 4-material transfer component, 401-transfer motor, 402-transfer belt, 5-drive mechanism, 501-drive motor, 502-synchronous belt, 6-first bearing, 7-inner screen cylinder, 701-end shaft, 702-feed mounting cylinder, 703-screen hole, 8-feeding component, 801-feeding cone, 802-feeding inner extension tube, 9-support rib, 10-second bearing, 11-grinding limit component, 12-grinding ball. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0024] Please see the appendix Figure 1 - Appendix Figure 3 An apparatus for producing silicon micropowder includes a horizontally arranged outer cylinder 1, with a heating assembly 2 provided on the outer wall of the outer cylinder. The heating assembly includes a plurality of graphite heaters 201 evenly distributed along the outer surface of the outer cylinder. The graphite heaters are set close to the outer cylinder and are electrically connected to an external power source.

[0025] Heating the silicon material reduces its hardness and loosens its structure, decreasing the grinding resistance between the grinding balls and the silicon, making it easier for the grinding balls 12 to grind it. The inner screen cylinder is driven by the drive mechanism 5 to rotate along its central axis. The grinding balls continuously tumble and move within the inner screen cylinder. Under the obstruction of the grinding limiters, the grinding balls rise to the top of the inner screen cylinder and then fall back down. Gravitational potential energy is converted into kinetic energy, making the relative motion of the silicon material more complex and resulting in more uniform grinding.

[0026] Please see the appendix Figure 4 - Appendix Figure 5 The outer cylinder contains an inner screen cylinder 7 coaxially arranged with the outer cylinder. The outer cylinder and the inner screen cylinder are respectively provided with a first bearing assembly and a second bearing assembly at both ends. The first bearing assembly is located on the side of the drive motor 501, and the second bearing assembly is located on the side of the feed inlet. The first bearing assembly includes a first bearing 6, and the outer ring of the first bearing is fixedly arranged with the outer cylinder.

[0027] The second bearing assembly includes a second bearing 10, with the outer ring of the second bearing fixedly disposed with the outer cylinder, and the inner ring of the second bearing fitted with the feed mounting cylinder 702 at the end of the inner screen cylinder; the inner screen cylinder 7 maintains precise coaxiality during rotation.

[0028] First bearing 6 and second bearing 10 are assembled at both ends of the inner screen cylinder. Then, the outer cylinder is fitted onto the outside of the inner screen cylinder. Finally, the end caps at both ends of the outer cylinder are assembled on both sides of the outer cylinder. The end caps have mounting holes, which are respectively matched with the outer rings of the first and second bearings.

[0029] The inner ring of the first bearing is fitted with the end shaft 701 of the inner screen cylinder 7. The end shaft is driven to rotate synchronously by the drive mechanism 5. The drive mechanism includes a drive motor 501, and a synchronous belt 502 is wound between the drive motor shaft and the end shaft. When the drive motor 501 is started, the end shaft is driven to rotate via the synchronous belt.

[0030] The inner screen cylinder contains several grinding balls 12. A driving mechanism is located at one end of the inner screen cylinder 7, driving it to rotate along its central axis. Grinding limiting components 11 are located along the inner wall of the inner screen cylinder. These grinding limiting components include grinding limiting plates arranged radially around the axis of the inner screen cylinder. The grinding limiting plates are evenly distributed circumferentially, with their width direction aligned with their radius direction. The width of the grinding limiting plates is greater than the diameter of the grinding balls. When the inner screen cylinder rotates to its lowest position, the grinding balls fall into the space between two grinding limiting plates. After being blocked, the grinding balls rotate with the inner screen cylinder to a higher position, then slide down under gravity. The gravitational potential energy of the grinding balls is converted into kinetic energy, impacting and vibrating the silicon material to achieve grinding.

[0031] The inner screen cylinder is provided with several rows of screen holes 703, avoiding the grinding limit plate 11. There is a row of screen holes between every two grinding limit plates. The spacing of the screen holes can be adjusted as needed. The diameter of the screen holes is set to the diameter of the silicon micro powder output particles. The diameter of the silicon micro powder output particles is less than or equal to the diameter of the screen holes. The screen holes are set to the diameter of the silicon micro powder output particles, and the particles fall through the screen holes.

[0032] Silicon material is ground into silicon microparticles, and the silicon microparticles of the appropriate particle size can be discharged through sieve aperture 703. The sieve aperture diameter matches the diameter of the discharged silicon microparticles, effectively classifying the silicon material. Particles that do not meet the particle size requirements (such as larger particles) cannot pass through the sieve apertures and are thus retained in the inner sieve cylinder for further grinding until they reach the target particle size before being discharged.

[0033] The silicon particles are ground to a certain fineness and discharged from the inner sieve cylinder through the sieve holes. The silicon particles that have not reached the grinding precision are ground again, which more effectively concentrates the silicon particles in the area that needs to be ground, greatly improving the grinding efficiency.

[0034] The end of the inner screen cylinder furthest from the drive mechanism is designated as the feeding port, and a feeding assembly 8 is provided at the feeding port. The feeding assembly 8 includes a feeding cone 801 with its opening facing upwards. The lower opening of the feeding cone is horizontally positioned, and a feeding inner extension pipe 802 is provided at the lower opening. The feeding inner extension pipe extends into the inner screen cylinder 7 along the feed mounting cylinder. Several supporting ribs 9 are provided circumferentially between the feeding inner extension pipe and the feed mounting cylinder. The feeding cone has an upward-facing opening and is cone-shaped. Silicon material is added along the feeding cone and falls smoothly under the action of gravity, falling into the inner screen cylinder along the feeding inner extension pipe. Grinding is carried out in the inner screen cylinder, and the silicon micro powder with qualified particle size is sieved through the sieve holes and falls into the outer cylinder.

[0035] The outer cylinder has an outlet on the bottom side away from the inlet. The outlet is a cone-shaped discharge cylinder 3 with the wide opening facing downwards. The ground silicon micro powder is sieved through the sieve holes and discharged through the outlet. A transfer component is located directly below the cone-shaped discharge cylinder. The cone-shaped discharge cylinder with the wide opening facing downwards ensures that the ground silicon micro powder falls to the transfer component under gravity and is promptly transferred and conveyed.

[0036] The material transfer assembly 4 includes a conveyor belt 402 that is inclined in the discharge direction. The top end of the conveyor belt is wound around the driven wheel, and the bottom end of the conveyor belt is wound around the driving wheel. A conveyor motor 401 is connected to the side of the driving wheel.

[0037] After the silicon material is discharged from the conical discharge cylinder, it falls directly onto the inclined conveyor belt 402. The conveyor belt 402 is inclined in the discharge direction to make full use of gravity and accelerate forward movement with the help of gravity. The silicon powder is conveyed more smoothly, avoiding silicon material accumulation and waiting time, and improving the continuity of production.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An apparatus for producing silicon micropowder, characterized in that: The device includes a horizontally arranged outer cylinder (1), a heating component (2) on the outer wall of the outer cylinder, an inner screen cylinder (7) coaxially arranged with the outer cylinder, a number of grinding balls (12) inside the inner screen cylinder, a driving mechanism (5) at one end of the inner screen cylinder, the driving mechanism drives the inner screen cylinder to rotate along the central axis, a grinding limiting component (11) is provided along the inner wall of the inner screen cylinder, a number of screen holes (703) are provided in the inner screen cylinder away from the grinding limiting component, and a feeding port is provided at the end of the inner screen cylinder away from the driving mechanism, and a feeding component (8) is provided at the feeding port.

2. The equipment for producing silicon micropowder according to claim 1, characterized in that: The bottom of the outer cylinder is provided with a discharge port on the side away from the feed inlet. The discharge port is a cone-shaped discharge cylinder (3) with the opening facing downwards. The ground silicon micro powder is screened through the sieve holes and discharged along the discharge port. A material transfer component (4) is provided directly below the cone-shaped discharge cylinder.

3. The equipment for producing silicon micropowder according to claim 2, characterized in that: The material transfer assembly (4) includes a conveyor belt (402) that is inclined in the discharge direction. The top end of the conveyor belt is wound around the driven wheel, and the bottom end of the conveyor belt is wound around the driving wheel. A conveyor motor (401) is connected to the side of the driving wheel.

4. The equipment for producing silicon micropowder according to claim 2, characterized in that: The grinding limiting component (11) includes a grinding limiting plate arranged radially with the axis of the inner screen cylinder as the center. The grinding limiting plates are evenly distributed along the circumference. The width direction of the grinding limiting plate is consistent with the radius direction. The width dimension of the grinding limiting plate is greater than the diameter of the grinding ball.

5. The equipment for producing silicon micropowder according to claim 2, characterized in that: The diameter of the sieve hole (703) is set to the diameter of the silicon micro powder output particles. The diameter of the silicon micro powder output particles is less than or equal to the diameter of the sieve hole and falls through the sieve hole.

6. The equipment for producing silicon micropowder according to claim 1, characterized in that: The outer cylinder and the inner screen cylinder are respectively provided with a first bearing assembly and a second bearing assembly. The first bearing assembly is located on the side of the drive motor, and the second bearing assembly is located on the side of the feed inlet. The first bearing assembly includes a first bearing (6). The outer ring of the first bearing is fixedly set with the outer cylinder, and the inner ring of the first bearing is fitted with the end shaft (701) of the inner screen cylinder (7). The end shaft (701) is driven to rotate synchronously by the drive assembly.

7. The equipment for producing silicon micropowder according to claim 6, characterized in that: The second bearing assembly includes a second bearing (10), the outer ring of the second bearing is fixedly disposed with the outer cylinder, and the inner ring of the second bearing is fitted with the feed mounting cylinder (702) at the end of the inner screen cylinder.

8. The equipment for producing silicon micropowder according to claim 7, characterized in that: The feeding assembly (8) includes a feeding cone (801) with the opening facing upward. The lower end of the feeding cone is horizontally positioned and a feeding inner extension pipe (802) is provided at the lower end. The feeding inner extension pipe extends into the inner screen cylinder along the feeding installation cylinder. Several supporting ribs (9) are provided circumferentially between the feeding inner extension pipe and the feeding installation cylinder.

9. The equipment for producing silicon micropowder according to claim 7, characterized in that: The drive mechanism (5) includes a drive motor (501), and a synchronous belt (502) is wound between the drive motor shaft and the end shaft.

10. The equipment for producing silicon micropowder according to claim 1, characterized in that: The heating assembly (2) includes several graphite heaters (201) evenly distributed along the outer surface of the outer cylinder. The graphite heaters are set close to the outer cylinder and are electrically connected to an external power source.

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