Impurity removal equipment for silicon carbide micro powder

Abstract

The invention discloses silicon carbide micro-powder impurity removal equipment, and belongs to the technical field of silicon carbide micro-powder production. The silicon carbide micro-powder impurity removal equipment comprises a shell, a feeding port is formed in the side wall of the shell, the spiral mechanism comprises a cylinder body and a spiral annular plate, one end of an inner cavity of the cylinder body communicates with the feeding port, a first discharging port is formed in the end portion of the other end of the inner cavity of the cylinder body, and a second discharging port is formed in the side wall of the end, close to the first discharging port, of the inner cavity of the cylinder body; the magnetic bar is used for adsorbing ferromagnetic impurities in raw materials of the silicon carbide micro powder; the feeding device comprises a powder feeding mechanism, an air pump and a venturi tube, the feeding port is communicated with an outlet section of the venturi tube, the air pump is communicated with an inlet section of the venturi tube, the powder feeding mechanism and the second discharging port are both communicated with a throat of the venturi tube, and the powder feeding mechanism is used for feeding raw materials of silicon carbide micro powder. According to the silicon carbide micro-powder impurity removal equipment, the thoroughness of silicon carbide micro-powder impurity removal can be improved, and the purity of the silicon carbide micro-powder after impurity removal is improved.

Description

Technical Field

[0001] This invention relates to the field of silicon carbide micro powder production technology, and specifically to a silicon carbide micro powder impurity removal device. Background Technology

[0002] In the production and processing of silicon carbide micropowder, silicon carbide micropowder is a key material for manufacturing products such as solar silicon wafers, semiconductor silicon wafers, engineering ceramics, heating elements, and advanced refractory materials. Its purity plays a decisive role in the performance of the final products. During processing such as crushing and grinding, silicon carbide micropowder undergoes friction and collision with equipment (such as jaw crushers and ball mills), producing metal fragments (ferromagnetic impurities) such as iron and steel. These ferromagnetic impurities are easily adsorbed by silicon carbide micropowder particles due to surface tension, van der Waals forces, or electrostatic effects, forming composite particles of "ferromagnetic impurities-silicon carbide." If the size of the ferromagnetic impurities is smaller than that of the silicon carbide micropowder (e.g., ferromagnetic impurities < 1 μm, silicon carbide micropowder 5-10 μm), they may be completely encapsulated within the silicon carbide particles, making it difficult for the magnetic field to act directly.

[0003] In the magnetic separation process of silicon carbide micropowder, the encapsulation or agglomeration of ferromagnetic impurities is one of the key reasons for incomplete impurity removal. Currently, the industry generally uses magnetic separation to remove ferromagnetic impurities from silicon carbide micropowder. Magnetic separation is based on the magnetic properties of metals and their oxides. By setting up a magnetic device, attractive or repulsive forces are applied to metal atoms, causing them to separate from the silicon carbide powder.

[0004] However, in the process of removing impurities, conventional magnetic separation equipment of this type usually has a limited magnetic field strength to avoid magnetizing the silicon carbide micro powder and affecting the removal effect. It can normally adsorb exposed ferromagnetic impurities without affecting the silicon carbide micro powder. However, since the ferromagnetic impurities are wrapped inside the silicon carbide particles and cannot be fully exposed and in contact with the magnetic separation equipment, they are subjected to weaker magnetic force than exposed ferromagnetic impurities and are difficult to be effectively separated, resulting in incomplete removal of impurities from the silicon carbide micro powder. Summary of the Invention

[0005] The purpose of this invention is to overcome the problems in the prior art and provide a silicon carbide micro powder impurity removal device that can improve the thoroughness of silicon carbide micro powder impurity removal and improve the purity of silicon carbide micro powder after impurity removal.

[0006] This invention provides a silicon carbide micro powder impurity removal device, including a shell, a feed inlet on the side wall of the shell, and further comprising: A spiral mechanism includes a cylinder and a spiral ring plate. The cylinder is disposed inside a housing. One end of the inner cavity of the cylinder is connected to the feed port. The spiral ring plate is disposed on the inner wall of the cylinder. A first discharge port is provided at the other end of the inner cavity of the cylinder. A second discharge port is provided on the side wall of the inner cavity of the cylinder near the first discharge port. A magnetic rod is disposed inside the housing. The magnetic rod is coaxially arranged with the spiral ring plate. The magnetic rod is used to adsorb ferromagnetic impurities in the raw material of silicon carbide micro powder. The feeding device includes a powder feeding mechanism, an air pump, and a venturi tube. The inlet is connected to the outlet section of the venturi tube, the air pump is connected to the inlet section of the venturi tube, and the powder feeding mechanism and the second outlet are both connected to the throat of the venturi tube. The powder feeding mechanism is used to supply raw materials for silicon carbide micro powder. The airflow blown by the air pump carries the raw materials of silicon carbide micro powder into the inlet when passing through the venturi tube. Under the action of the spiral ring plate in the cylinder, the airflow carries the raw materials in a spiral motion from the inlet to the first outlet in the cylinder with the axis of the magnetic rod as the axis.

[0007] Preferably, the housing is provided with a slide rail, the outer wall of the cylinder is provided with a slider, the cylinder is slidably connected to the slide rail along the axial direction of the cylinder via the slider, and the cylinder is provided with a vibration generator, which is used to drive the cylinder to perform pulse vibration along its own axial direction.

[0008] Preferably, the cylinder body has a flared end near the feed inlet. The smaller end of the flared end is connected to the inner cavity of the cylinder body, and the larger end of the flared end is connected to the feed inlet. The outer edge of the larger end of the flared end is slidably connected to the inner wall of the housing along the axial direction of the cylinder body. A spring is provided inside the housing. The spring abuts against the outer edge of the larger end of the flared end. The spring is used to apply an elastic force along the axial direction of the cylinder body to the cylinder body.

[0009] Preferably, the magnetic rod includes a sleeve and an electromagnetic coil. The housing has a first through hole, and the sleeve extends into the inner cavity of the cylinder after passing through the first through hole. The sleeve is coaxially arranged with the spiral ring plate. A gate valve is provided on the first through hole. When closed, the gate valve can seal the gap between the outer wall of the sleeve and the inner wall of the first through hole. The electromagnetic coil is located inside the sleeve and is used to generate magnetic force when energized. The electromagnetic coil is electrically connected to a controller.

[0010] Preferably, a waste bin is provided on one side of the housing. The waste bin is connected to the inner cavity of the cylinder through a first through hole. A second through hole is provided on the side wall of the waste bin, which is coaxial with the first through hole. The first through hole and the second through hole are respectively located on two opposite side walls of the waste bin. The sleeve passes through the second through hole and the first through hole and extends into the inner cavity of the cylinder. The inner wall of the second through hole is in contact with the outer wall of the sleeve. The second through hole is used to scrape off ferromagnetic impurities adsorbed on the outer wall of the sleeve.

[0011] Preferably, an inductive switch is provided on the side wall of the first through hole, and the inductive switch is electrically connected to the controller. A sensing plate is provided at the end of the sleeve that extends into the inner cavity of the cylinder. When the sensing plate passes through the first through hole, the inductive switch is triggered, and the controller controls the electromagnetic coil to de-energize.

[0012] Preferably, the gate valve includes a drive mechanism and two valve plates, which are symmetrically arranged on both sides of the sleeve. Each valve plate has an arc-shaped groove on its adjacent side. The drive mechanism is connected to the two valve plates and is used to drive the two valve plates to move closer or further apart. When the two valve plates move closer together, the side walls of the two valve plates can block the gap between the outer wall of the sleeve and the inner wall of the first through hole. The inner walls of the arc-shaped grooves on the two valve plates are in contact with the outer wall of the sleeve.

[0013] Preferably, the spiral ring plate is made of high carbon steel.

[0014] Preferably, the spiral ring plate is detachably connected to the cylinder body.

[0015] Preferably, the sleeve is made of a ferromagnetic material.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: The silicon carbide micro powder impurity removal device of the present invention mixes the raw material of silicon carbide micro powder to be removed with airflow through a feeding device and sends it into the inner cavity of a cylinder. After entering the inner cavity of the cylinder, the mixed airflow moves in a spiral shape under the action of a spiral ring plate. The silicon carbide micro powder that has not formed composite particles and the ferromagnetic impurities, due to their smaller mass and smaller radius of motion, are closer to the magnetic rod. The ferromagnetic impurities are adsorbed onto the magnetic rod, while the silicon carbide micro powder continues to move towards the first discharge port and is eventually discharged from the cylinder. The composite particles formed by the silicon carbide micro powder containing ferromagnetic impurities in the mixed airflow have a larger mass and a larger radius of motion during spiral motion. The attraction of the magnetic rod to them is weaker, and the supporting force of the inner wall of the cylinder provides the centripetal force required for their spiral motion. When the composite particles move to the cylinder near the first discharge port, they are discharged from the inner cavity through the second discharge port, thereby achieving the separation of the composite particles from the mixed airflow and improving the thoroughness of silicon carbide micro powder impurity removal and the purity of the removed particles. By setting up a vibration generator, the cylinder vibrates. The side wall and internal spiral ring plate of the cylinder vibrate and impact the composite particles moving close to the inner wall, thereby breaking up the composite particles and separating the silicon carbide micro powder from the ferromagnetic impurities in the composite particles. This allows the ferromagnetic impurities to be adsorbed by the magnetic rod, further improving the thoroughness of impurity removal from the silicon carbide micro powder. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the external structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is a schematic diagram of the structure of the first working state of the AA surface of the present invention; Figure 4 This is a schematic diagram of the structure of the second working state of the AA surface of the present invention; Figure 5 This is a schematic diagram of the gate valve structure of the present invention; Figure 6 This is a schematic diagram of the structure of the sensing element in this invention.

[0018] Explanation of reference numerals in the attached figures: 101. Housing; 102. Feed inlet; 103. Cylinder body; 104. Spiral ring plate; 105. First discharge port; 106. Second discharge port; 107. Magnetic rod; 201. Slide rail; 202. Slider; 203. Vibration generator; 301. Venturi tube; 302. Outlet section; 303. Inlet section; 304. Throat; 401. Trumpet mouth; 402. Spring; 501. Sleeve; 502. Electromagnetic coil; 503. First through hole; 504. Gate valve; 601. Waste bin; 602. Second through hole; 701. Inductive switch; 702. Inductive plate; 801. Drive mechanism; 802. Valve plate; 803. Gap. Detailed Implementation

[0019] The following is in conjunction with the appendix Figures 1-6 The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0020] like Figures 1-6As shown, the present invention provides a silicon carbide micro powder impurity removal device, including a housing 101, with a feed inlet 102 on the side wall of the housing 101, and further including: a spiral mechanism, a magnetic rod 107, and a feeding device. The spiral mechanism includes a cylinder 103 and a spiral ring plate 104. The cylinder 103 is disposed inside the housing 101, with one end of the inner cavity of the cylinder 103 communicating with the feed inlet 102. The spiral ring plate 104 is disposed on the inner wall of the cylinder 103, and a first discharge port 105 is provided at the other end of the inner cavity of the cylinder 103. A second discharge port 106 is provided on the side wall of the inner cavity of the cylinder 103 near the first discharge port 105. The magnetic rod 107 is disposed inside the housing 101, and the magnetic rod 107 is coaxially arranged with the spiral ring plate 104. The magnetic rod 107 is used to adsorb... Ferromagnetic impurities in the raw material of silicon carbide micro powder; the feeding device includes a powder feeding mechanism, an air pump and a venturi tube 301. The inlet 102 is connected to the outlet section 302 of the venturi tube 301, the air pump is connected to the inlet section 303 of the venturi tube 301, and the powder feeding mechanism and the second outlet 106 are both connected to the throat 304 of the venturi tube 301. The powder feeding mechanism is used to supply the raw material of silicon carbide micro powder. When the airflow blown out by the air pump passes through the venturi tube 301, it carries the raw material of silicon carbide micro powder into the inlet 102. Under the action of the spiral ring plate 104 in the cylinder 103, the airflow carries the raw material in the cylinder 103 with the axis of the magnetic rod 107 as the axis, and moves in a spiral shape from the inlet 102 to the first outlet 105.

[0021] The working principle of the above embodiments is briefly described below: The feed inlet 102 of this equipment is located on one side of the axial surface of the cylinder 103. During use, the air pump introduces a high-speed airflow into the venturi tube 301 through the inlet section 303. As the high-speed airflow passes through the throat 304 of the venturi tube 301, under the action of air pressure, it blows the raw material supplied by the powder supply mechanism into the feed inlet 102 through the outlet section 302 of the venturi tube 301. The high-speed airflow fully disperses the silicon carbide micro powder in the raw material. The mixed airflow (containing raw material) entering the feed inlet 102 enters the inner cavity of the cylinder 103, where the silicon carbide micro powder carried by the airflow is fully dispersed in the airflow. Since the feed inlet 102 is located on one side of the central axis of the cylinder 103, the mixed airflow entering the inner cavity of the cylinder 103 will rotate in the cavity, and the direction of rotation of the mixed airflow is the same as the direction of rotation of the spiral ring plate 104 to ensure the stability of the spiral motion. Under the action of the spiral ring plate 104 in the inner cavity of the cylinder 103, the mixed airflow moves in a spiral shape from the feed inlet 102 to the first discharge port 105. During this process, because the raw materials are fully dispersed in the airflow, the silicon carbide micropowder that has not formed composite particles and the ferromagnetic impurities, due to their smaller mass, have a smaller radius of motion during spiral motion under the action of constant airflow, and are closer to the magnetic rod 107 located at the axis of the spiral ring plate 104. Among them, the ferromagnetic impurities are attracted by the magnetic force of the magnetic rod 107 and are adsorbed, while the silicon carbide micropowder is not affected by the magnetic force and continues to move towards the first discharge port 105. Since the first discharge port 105 is located at the end of the inner cavity of the cylinder 103, the silicon carbide micropowder close to the magnetic rod 107 will be discharged from the cylinder 103 through the first discharge port 105, completing the removal of impurities from the raw materials.

[0022] In the mixed airflow, the composite particles formed by silicon carbide micropowder encapsulating ferromagnetic impurities have a larger radius of motion during spiral motion due to their larger mass, and are further away from the magnetic rod 107, resulting in a weaker attraction from the magnetic rod 107. The composite particles will abut against the inner wall of the cylinder 103, and the supporting force of the inner wall of the cylinder 103 provides the centripetal force required for their spiral motion. When the composite particles move to the end of the cylinder 103 near the first discharge port 105, since the second discharge port 106 is located on the side wall of the cylinder 103 near the first discharge port 105, the composite particles will be discharged from the inner cavity of the cylinder 103 through the second discharge port 106, realizing the separation of the composite particles from the raw materials; and the composite particles discharged from the second discharge port 106 will be blown back into the cylinder 103 through the venturi tube 301 for further separation and impurity removal, improving the thoroughness of impurity removal from the silicon carbide micropowder.

[0023] The silicon carbide micro powder impurity removal equipment of the present invention can separate the composite particles formed by ferromagnetic impurities encapsulated in the silicon carbide micro powder during the impurity removal process, thereby improving the thoroughness of impurity removal and the purity of the silicon carbide micro powder after impurity removal.

[0024] Based on the above embodiments, in order to enable the ferromagnetic impurities in the composite particles to be adsorbed by the magnetic rod 107, the thoroughness of impurity removal of silicon carbide micro powder is improved.

[0025] like Figure 2 As shown, the housing 101 is provided with a slide rail 201, the outer wall of the cylinder 103 is provided with a slider 202, the cylinder 103 is slidably connected to the slide rail 201 along the axial direction of the cylinder 103 via the slider 202, and the cylinder 103 is provided with a vibration generator 203, which is used to drive the cylinder 103 to perform pulse vibration along its own axial direction.

[0026] When the mixed airflow enters the inner cavity of the cylinder 103, the silicon carbide micropowder that has not formed composite particles and the ferromagnetic impurities approach the magnetic rod 107 and move in a spiral shape toward the first discharge port 105, while the larger composite particles will adhere to the inner wall of the cylinder 103. At this time, by controlling the operation of the vibration generator 203, it will drive the cylinder 103 to perform pulse vibration along its own axis. The slider 202 outside the cylinder 103 slides on the slide rail 201 inside the housing 101. The slider 202 and the slide rail 201 guide the vibration of the cylinder 103 to ensure the stability of the vibration direction. When the cylinder 103 vibrates, the side wall and the spiral ring plate 104 inside the cylinder 103 will vibrate and impact the composite particles moving close to its inner wall, thereby breaking up the composite particles and separating the silicon carbide micro powder from the ferromagnetic impurities in the composite particles. After separation, the unseparated composite particles discharged from the second discharge port 106 will be blown back into the cylinder 103 through the venturi tube 301 for vibration separation and impurity removal again, so that the separated ferromagnetic impurities can be adsorbed by the magnetic rod 107, thereby further improving the thoroughness of silicon carbide micro powder impurity removal.

[0027] As a preferred option, such as Figure 2 As shown, the cylinder 103 has a flared end 401 near the feed inlet 102. The smaller end of the flared end 401 communicates with the inner cavity of the cylinder 103, and the larger end of the flared end 401 communicates with the feed inlet 102. The outer edge of the larger end of the flared end 401 is slidably connected to the inner wall of the housing 101 along the axial direction of the cylinder 103. A spring 402 is provided inside the housing 101, and the spring 402 abuts against the outer edge of the larger end of the flared end 401. The spring 402 is used to apply an elastic force to the cylinder 103 along the axial direction of the cylinder 103. By setting the flared end 401 and the spring 402, when the vibration generator 203 drives the cylinder 103 to pulse vibrate along its own axial direction, the spring 402 can apply an elastic force to the cylinder 103, avoiding hard contact between the cylinder 103 and the housing 101, thereby preventing the housing 101 from being impacted. When the mixed airflow carrying the raw materials enters the inner cavity of the shell through the feed inlet 102, the rapid expansion of the airflow volume enhances the dispersion effect of the silicon carbide micropowder, thereby making the silicon carbide micropowder, ferromagnetic impurities, and composite particles in the mixed airflow more uniformly distributed. Then, the uniformly mixed airflow enters the cylinder 103 through the flared end 401. Since the cylinder 103 is connected to the small end of the flared end 401, the airflow cross-section is reduced, and the flow velocity of the mixed airflow increases accordingly. This increases the speed of the spiral motion of the mixed airflow in the cylinder 103, thereby improving the impurity removal efficiency. At the same time, it enhances the centrifugal effect of the composite particles, improving their separation thoroughness, and thus improving the overall impurity removal effect of the equipment on silicon carbide micropowder.

[0028] As a preferred option, such as Figures 2-6As shown, the magnetic rod 107 includes a sleeve 501 and an electromagnetic coil 502. The housing 101 has a first through hole 503. The sleeve 501 passes through the first through hole 503 and extends into the inner cavity of the cylinder 103. The sleeve 501 is coaxially arranged with the spiral ring plate 104. A gate valve 504 is provided on the first through hole 503. When closed, the gate valve 504 can seal the gap 803 between the outer wall of the sleeve 501 and the inner wall of the first through hole 503. The electromagnetic coil 502 is located inside the sleeve 501 and generates magnetic force when energized. The electromagnetic coil 502 is electrically connected to a controller. During the removal of impurities from silicon carbide micropowder, the gate valve 504 is closed to seal the gap 803 between the outer wall of the sleeve 501 and the inner wall of the first through hole 503, preventing leakage of silicon carbide micropowder from the gap 803 during the removal process. Then, the controller energizes the electromagnetic coil 502. Under the action of the electromagnetic coil 502, the sleeve 501 generates a magnetic field, which attracts the ferromagnetic impurities in the silicon carbide micropowder, adsorbing them onto the outer wall of the sleeve 501. When too many ferromagnetic impurities are adsorbed on the sleeve 501, the adsorption effect of the entire magnetic rod 107 will deteriorate. At this time, the gate valve 504 is opened, and the sleeve 501 is pulled out from the first through hole 503, peeling off the ferromagnetic impurities adsorbed on the outer wall of the sleeve 501, restoring the adsorption efficiency of the magnetic rod 107, thereby ensuring its adsorption effect on ferromagnetic impurities and ensuring the impurity removal effect of the equipment.

[0029] As a preferred option, such as Figures 1-5 As shown, a waste bin 601 is provided on one side of the housing 101. The waste bin 601 is connected to the inner cavity of the cylinder 103 through a first through hole 503. A second through hole 602 is provided on the side wall of the waste bin 601, which is coaxially arranged with the first through hole 503. The first through hole 503 and the second through hole 602 are respectively located on two opposite side walls of the waste bin 601. The sleeve 501 extends into the inner cavity of the cylinder 103 after passing through the second through hole 602 and the first through hole 503. The inner wall of the second through hole 602 is attached to the outer wall of the sleeve 501. The second through hole 602 is used to scrape off ferromagnetic impurities adsorbed on the outer wall of the sleeve 501.

[0030] By setting up a waste bin 601, when too many ferromagnetic impurities are adsorbed on the outer wall of the sleeve 501, the gate valve 504 is opened, and the sleeve 501 is driven to move outward along its own axis towards the cylinder 103. Since there is a gap 803 between the inner wall of the first through hole 503 and the outer wall of the sleeve 501, and the inner wall of the second through hole 602 is tightly fitted to the outer wall of the sleeve 501, the edge of the second through hole 602 will peel off the ferromagnetic impurities adsorbed on the outer wall of the sleeve 501. The peeled ferromagnetic impurities will fall into the waste bin 601 for centralized collection and processing. Then, the sleeve 501 is reset and inserted into the cylinder 103, and the gate valve 504 is closed, allowing the magnetic rod 107 to restore its adsorption effect on the ferromagnetic impurities.

[0031] As a preferred option, such as Figure 2 , Figure 5 and Figure 6 As shown, an inductive switch 701 is provided on the side wall of the first through hole 503. The inductive switch 701 is electrically connected to the controller. A sensing plate 702 is provided at the end of the sleeve 501 that extends into the inner cavity of the cylinder 103. When the sensing plate 702 passes through the first through hole 503, the inductive switch 701 is triggered, and the controller controls the electromagnetic coil 502 to be de-energized. By setting the inductive switch 701, during the process of pulling the sleeve 501 out of the cylinder 103 to remove ferromagnetic impurities adsorbed on the outer wall of the sleeve 501, the sensing plate 702 will gradually approach the inductive switch 701. Since the sensing plate 702 is located at the end of the sleeve 501 that extends into the inner cavity of the cylinder 103, when the sensing plate 702 moves into the first through hole 503, the sleeve 501 has been completely pulled out of the inner cavity of the cylinder 103. At this point, under the scraping action of the edge of the second through hole 602 and the magnetic attraction of the sleeve 501, the ferromagnetic impurities initially accumulate on the outer wall of the sleeve 501 located inside the waste bin 601. Then, the inductive switch 701 triggers the controller, de-energizing the electromagnetic coil 502, causing the magnetic attraction of the sleeve 501 to rapidly decrease. All the ferromagnetic impurities accumulated on its outer wall fall into the waste bin 601, thus cleaning the impurities outside the sleeve 501 and ensuring the effective adsorption of ferromagnetic impurities by the magnetic rod 107.

[0032] As a preferred option, such as Figures 2-5As shown, the gate valve 504 includes a drive mechanism 801 and two valve plates 802. The two valve plates 802 are symmetrically arranged on both sides of the sleeve 501. Each valve plate 802 has an arc-shaped groove on its adjacent side. The drive mechanism 801 is connected to the two valve plates 802 and is used to drive the two valve plates 802 to move closer or further apart. When the two valve plates 802 move closer together, the sidewalls of the two valve plates 802 can block the gap 803 between the outer wall of the sleeve 501 and the inner wall of the first through hole 503. The inner walls of the arc-shaped grooves on the two valve plates 802 are in contact with the outer wall of the sleeve 501. When removing impurities from the raw material, the magnetic rod 107 is located inside the cylinder 103. At this time, the inner walls of the arc-shaped grooves of the two valve plates 802 are tightly fitted to the outer wall of the sleeve 501, so that the side walls of the two valve plates 802 block the gap 803 between the inner wall of the first through hole 503 and the outer wall of the sleeve 501, thereby preventing the leakage of silicon carbide micro powder in the raw material during the impurity removal process. When the ferromagnetic impurities adsorbed on the outside of the sleeve 501 are peeled off, the drive mechanism 801 is controlled to move, which drives the two valve plates 802 to move away from each other, thereby separating the arc-shaped grooves on the valve plates 802 from the sleeve 501, exposing the gap 803 between the outer wall of the sleeve 501 and the inner wall of the first through hole 503, thereby preventing the valve plates 802 from scraping the ferromagnetic impurities on the sleeve 501 into the inner cavity of the cylinder 103.

[0033] As a preferred option, such as Figure 2 As shown, the spiral ring plate 104 is made of high-carbon steel. Using high-carbon steel to make the spiral ring plate 104 can improve the wear resistance of the spiral ring plate 104, thereby reducing the introduction of new impurities due to wear of the spiral ring plate 104. Furthermore, even if the new impurities introduced by the spiral ring plate 104 are ferromagnetic, they can be removed by this equipment.

[0034] As a preferred option, such as Figure 2 As shown, the spiral ring plate 104 is detachably connected to the cylinder body 103. This detachable connection facilitates the disassembly and installation of the spiral ring plate 104, thereby simplifying the maintenance of the entire device.

[0035] As a preferred option, such as Figure 2 As shown, the sleeve 501 is made of ferromagnetic material. Using ferromagnetic material to make the sleeve 501 ensures the magnetic attraction of the entire magnetic rod 107, thereby guaranteeing the thorough separation of silicon carbide micropowder from ferromagnetic impurities.

[0036] Although embodiments of the 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 invention.

Claims

1. A silicon carbide micro powder impurity removal device, comprising a shell, wherein a feed inlet is provided on the side wall of the shell, characterized in that, Also includes: A spiral mechanism includes a cylinder and a spiral ring plate. The cylinder is disposed inside a housing. One end of the inner cavity of the cylinder is connected to the feed port. The spiral ring plate is disposed on the inner wall of the cylinder. A first discharge port is provided at the other end of the inner cavity of the cylinder. A second discharge port is provided on the side wall of the inner cavity of the cylinder near the first discharge port. A magnetic rod is disposed inside the housing. The magnetic rod is coaxially arranged with the spiral ring plate. The magnetic rod is used to adsorb ferromagnetic impurities in the raw material of silicon carbide micro powder. The feeding device includes a powder feeding mechanism, an air pump, and a venturi tube. The inlet is connected to the outlet section of the venturi tube, the air pump is connected to the inlet section of the venturi tube, and the powder feeding mechanism and the second outlet are both connected to the throat of the venturi tube. The powder feeding mechanism is used to supply raw materials for silicon carbide micro powder. The airflow blown by the air pump carries the raw materials of silicon carbide micro powder into the inlet when passing through the venturi tube. Under the action of the spiral ring plate in the cylinder, the airflow carries the raw materials in a spiral motion from the inlet to the first outlet in the cylinder with the axis of the magnetic rod as the axis.

2. The silicon carbide micro powder impurity removal equipment as described in claim 1, characterized in that, The housing is provided with a slide rail, and the outer wall of the cylinder is provided with a slider. The cylinder is slidably connected to the slide rail along the axial direction of the cylinder via the slider. The cylinder is provided with a vibration generator, which is used to drive the cylinder to perform pulse vibration along its own axial direction.

3. The silicon carbide micro powder impurity removal equipment as described in claim 2, characterized in that, The cylinder body is provided with a flared mouth at one end near the feed inlet. The small end of the flared mouth is connected to the inner cavity of the cylinder body, and the large end of the flared mouth is connected to the feed inlet. The outer edge of the large end of the flared mouth is slidably connected to the inner wall of the housing along the axial direction of the cylinder body. A spring is provided inside the housing. The spring abuts against the outer edge of the large end of the flared mouth. The spring is used to apply an elastic force along the axial direction of the cylinder body to the cylinder body.

4. The silicon carbide micro powder impurity removal equipment as described in claim 1, characterized in that, The magnetic rod includes a sleeve and an electromagnetic coil. The housing has a first through hole. The sleeve passes through the first through hole and extends into the inner cavity of the cylinder. The sleeve is coaxially arranged with the spiral ring plate. A gate valve is provided on the first through hole. When the gate valve is closed, it can seal the gap between the outer wall of the sleeve and the inner wall of the first through hole. The electromagnetic coil is located inside the sleeve. The electromagnetic coil is used to generate magnetic force when energized. The electromagnetic coil is electrically connected to a controller.

5. The silicon carbide micro powder impurity removal equipment as described in claim 4, characterized in that, A waste bin is provided on one side of the shell. The waste bin is connected to the inner cavity of the cylinder through a first through hole. A second through hole is provided on the side wall of the waste bin, which is coaxial with the first through hole. The first through hole and the second through hole are respectively located on two opposite side walls of the waste bin. The sleeve passes through the second through hole and the first through hole and extends into the inner cavity of the cylinder. The inner wall of the second through hole is attached to the outer wall of the sleeve. The second through hole is used to scrape off ferromagnetic impurities adsorbed on the outer wall of the sleeve.

6. The silicon carbide micro powder impurity removal equipment as described in claim 5, characterized in that, An inductive switch is provided on the side wall of the first through hole. The inductive switch is electrically connected to the controller. An inductive plate is provided at the end of the sleeve that extends into the inner cavity of the cylinder. When the inductive plate passes through the first through hole, the inductive switch is triggered, and the controller controls the electromagnetic coil to be de-energized.

7. The silicon carbide micro powder impurity removal equipment as described in claim 4, characterized in that, The gate valve includes a drive mechanism and two valve plates. The two valve plates are symmetrically arranged on both sides of the sleeve. The side of the two valve plates that are close to each other is provided with an arc-shaped groove. The drive mechanism is connected to the two valve plates and is used to drive the two valve plates to move closer to each other or further away from each other. When the two valve plates move closer to each other, the side walls of the two valve plates can block the gap between the outer wall of the sleeve and the inner wall of the first through hole. The inner walls of the arc-shaped grooves on the two valve plates are in contact with the outer wall of the sleeve.

8. The silicon carbide micro powder impurity removal equipment as described in claim 1, characterized in that, The spiral ring plate is made of high carbon steel.

9. The silicon carbide micro powder impurity removal equipment as described in claim 1, characterized in that, The spiral ring plate is detachably connected to the cylinder body.

10. The silicon carbide micro powder impurity removal equipment as described in claim 4, characterized in that... The sleeve is made of ferromagnetic material.

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