Jet mill for reducing conductivity of silicon carbide
By setting a crushing box and a guide tube at the front end of the air flow mill and using the design of staggered guide plates and magnetic rods, the problems of low impurity removal efficiency and high cost of existing air flow mills are solved, and a high-efficiency and low-cost silicon carbide impurity removal effect is achieved.
Patent Information
- Application Number
- CN202422655265.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-10-03
- Estimated Expiration
- 2034-10-31
AI Technical Summary
The existing air jet mill is inefficient and costly in removing impurities, especially in the process of removing impurities from silicon carbide conductivity, where existing equipment is difficult to remove impurities efficiently.
A crushing box and a guide tube are set at the front end of the air flow mill. The crushing device is used to break down the silicon carbide raw materials into particles. The staggered guide plates and magnetic rods are used to improve the impurity removal efficiency. The scraper plate and the leakage port are combined to optimize the material dropping process and enhance the impurity removal effect.
Through the design of the crushing box and guide tube, the impurity removal efficiency of silicon carbide is significantly improved, the impurity removal cost is reduced, and the impurity removal ability of the magnetic rod is enhanced, achieving more efficient impurity removal.
Smart Images
Figure CN223405031U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of silicon carbide production, and in particular to a jet mill for reducing the electrical conductivity of silicon carbide. Background Art
[0002] Silicon carbide, an inorganic substance with the chemical formula SiC, is produced by smelting raw materials such as quartz sand, petroleum coke (or coal coke), and sawdust (salt is added when producing green silicon carbide) at high temperatures in a resistance furnace. Silicon carbide is a semiconductor that occurs naturally in the extremely rare mineral moissanite. Since 1893, it has been mass-produced in powder and crystal form for use as abrasives, among other applications. Among non-oxide high-tech refractory raw materials such as carbon, nitrogen, and boron, silicon carbide is the most widely used and economical, often referred to as corundum or refractory sand. Industrially produced silicon carbide in China is divided into two types: black silicon carbide and green silicon carbide, both of which are hexagonal crystals.
[0003] Electrical conductivity is a key performance indicator for silicon carbide. This is primarily related to the amount of impurities it contains. Existing jet mills remove impurities through the classifying wheel within the mill, prioritizing impurities at the inlet. This results in low impurity removal efficiency and high costs associated with using the classifying wheel. Utility Model Content
[0004] In view of the above problems, an embodiment of the present application provides a jet mill for reducing the electrical conductivity of silicon carbide, which can perform impurity removal operations at the front end of the jet mill at a low cost.
[0005] According to one aspect of the embodiment of the present application, there is provided a jet mill for reducing the electrical conductivity of silicon carbide. The jet mill for reducing the electrical conductivity of silicon carbide comprises a jet mill body, one side of the jet mill body is connected to a feed pipe, the feed pipe is connected to a feeding device, the feeding device comprises a crushing box, the bottom of the crushing box is connected to the feed pipe through a transversely arranged guide tube, the guide tube gradually tilts downward from one end close to the crushing box to the end close to the feed pipe, the crushing box is provided with a crushing device inside, the crushing device comprises a vertically arranged transmission shaft, the crushing box is provided with a transverse partition, the bottom of the transmission shaft It can be rotatably connected to the central axis of the transverse partition, and the bottom end of the transmission shaft is connected to a scraper plate, and the scraper plate is located above the transverse partition. The scraper plate and the transverse partition are respectively provided with a plurality of mutually corresponding first leakage ports and second leakage ports. A plurality of guide plates are provided in the guide tube, and the plurality of guide plates are arranged in parallel, and one end of the plurality of guide plates respectively extends to the bottom of the crushing box and is staggered. A plurality of magnetic rods are provided through the guide tube, and the plurality of magnetic rods are respectively located above the plurality of guide plates.
[0006] In some embodiments, the transmission shaft is externally connected to a support drum frame, and a plurality of crushing rollers are arranged on the periphery of the support drum frame. The top end of the transmission shaft passes through the top of the crushing box and is connected to a first bevel gear. The top end of the support drum frame passes through the top of the crushing box and is connected to a second bevel gear. The first bevel gear and the second bevel gear are jointly engaged with a third bevel gear, and the first bevel gear is coaxially connected to a drive motor.
[0007] In some embodiments, a semi-spherical scraper cover is provided on the top of the scraper plate at the first leakage port.
[0008] In some embodiments, a feeding chute is provided on one side of the crushing box, and the feeding chute is connected to the inner cavity of the crushing box.
[0009] In some embodiments, a fixing sleeve is clamped at both end ports of the magnetic rod, an external thread is provided on the fixing sleeve, holes are provided on both sides of the guide tube, and both ends of the magnetic rod are respectively passed through the holes to the outside of the guide tube and then screwed with a rotating nut.
[0010] In some embodiments, a dust collecting device is included, which includes a dust collecting hood. A slide rail is provided at the bottom end of the dust collecting hood. A slide groove matching the slide rail is provided at the outer wall of the guide tube. The dust collecting hood is connected to a negative pressure pipe.
[0011] The beneficial effects of the present application are as follows: in the present application, by providing a crushing box, the silicon carbide raw materials that are stuck together can be decomposed into particles, thereby facilitating the subsequent silicon carbide raw materials to increase the corresponding area between them and the magnetic rod when passing through the magnetic rod, thereby ensuring that the magnetic rod can complete the impurity removal more efficiently. By providing multiple guide plates in the guide tube and staggering the multiple guide plates, when the material falls into the guide tube, it can fall onto each guide plate in a dispersed manner and slide, thereby further enhancing the impurity removal effect. The present application also provides a scraper plate and provides a first leakage port and a second leakage port on the scraper plate and the diaphragm respectively, so that the scraper plate completes the silicon carbide dropping operation during the rotation process.
[0012] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:
[0014] Figure 1 A schematic diagram of the overall cross-sectional structure of a jet mill for reducing the electrical conductivity of silicon carbide provided in an embodiment of the present application;
[0015] Figure 2 A schematic diagram of the overall structure of a jet mill for reducing the electrical conductivity of silicon carbide provided in an embodiment of the present application;
[0016] Figure 3 A schematic diagram of the local structure of the magnetic rod provided in an embodiment of the present application.
[0017] The accompanying drawings in the specific implementation manner are as follows:
[0018] An air flow mill 1000 for reducing the electrical conductivity of silicon carbide includes a feeding device 100, a crushing box 110, a transverse partition 111, a first leakage port 111a, a scraper plate 112, a second leakage port 112a, a scraper cover 112b, a loading chute 113, a guide tube 120, a guide plate 121, a chute 122, a crushing device 130, a transmission shaft 131, a support drum frame 132, a crushing roller 133, a first bevel gear 134, a second bevel gear 135, a third bevel gear 136, a drive motor 137, a magnetic rod 140, a fixing sleeve 141, a rotating nut 142, a dust collecting cover 150, an air flow mill body 200, and a feeding pipe 210. DETAILED DESCRIPTION
[0019] The following will describe in detail the embodiments of the technical solution of the present application in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only used as examples and cannot be used to limit the scope of protection of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present application; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" in the specification and claims of the present application and the above-mentioned description of the drawings and any variations thereof are intended to cover non-exclusive inclusions.
[0020] Specifically, please refer to Figures 1 to 3 , Figure 1 This is a schematic diagram of the overall cross-sectional structure of a jet mill for reducing the electrical conductivity of silicon carbide provided in an embodiment of the present application. Figure 2 This is a schematic diagram of the overall structure of a jet mill for reducing the electrical conductivity of silicon carbide provided in an embodiment of the present application. Figure 3 A schematic diagram of the local structure of the magnetic rod provided in an embodiment of the present application. The air flow mill 1000 for reducing the electrical conductivity of silicon carbide includes an air flow mill main body 200, and one side of the air flow mill main body 200 is connected to a feed pipe 210. The air flow mill main body 200 is a prior art, and the feed pipe 210 is used to feed silicon carbide into the air flow mill for pneumatic grinding. The feed pipe 210 is connected to a feeding device 100, and the feeding device 100 includes a crushing box 110, and the crushing box 110 is used to crush the adhered silicon carbide into particles. The bottom of the crushing box 110 is connected to the feed pipe 210 through a transversely arranged guide tube 120, and the guide tube 120 can feed the crushed silicon carbide particles in the crushing box 110 into the air flow mill main body 200 through the feed pipe 210. The guide tube 120 gradually tilts downward from the end near the crushing box 110 to the end near the feed pipe 210. The tilt angle can be set according to actual conditions so that the silicon carbide inside can slide down the guide plate 121 or the inner wall of the guide tube 120 under its own weight and fall into the jet mill body 200. A crushing device 130 is installed inside the crushing box 110. This crushing device 130 is used to rotate the silicon carbide and impact the silicon carbide particles, breaking them into granules. The crushing device 130 includes a vertically arranged drive shaft 131. A diaphragm 111 is installed inside the crushing box 110, which encloses the inner cavity of the crushing box 110 at its center. The bottom of the drive shaft 131 is rotatably connected to the central axis of the diaphragm 111. The bottom end of the drive shaft 131 is connected to a scraper plate 112. The drive shaft 131 can be driven by an external motor, thereby driving the scraper plate 112 to rotate. The scraper plate 112 is located above the diaphragm 111. The scraper plate 112 and the diaphragm 111 are each provided with a plurality of mutually corresponding first and second material leakage openings 111a, 112a. During the rotation of the scraper plate 112, when the first and second material leakage openings 111a, 112a align, the material in the crushing box 110 will sequentially pass through the first and second material leakage openings 111a, 112a and enter the guide tube 120. The guide tube 120 is provided with a plurality of guide plates 121, which are arranged in parallel. One end of each of the guide plates 121 extends below the crushing box 110 and is staggered. This staggered arrangement ensures that the silicon carbide that falls into the guide tube 120 is evenly distributed on each of the guide plates 121. A plurality of magnetic rods 140 are provided through the guide tube 120 and are respectively located above the plurality of guide plates 121. When the silicon carbide raw material slides along the guide plates 121 and the bottom wall of the guide tube 120, the magnetic rods 140 can absorb the magnetic impurities mixed in the silicon carbide raw material.
[0021] As can be seen from the above, in the embodiment of the present application, by providing a crushing box 110, the silicon carbide raw materials that are stuck together can be broken down into granules, thereby facilitating the subsequent silicon carbide raw materials to increase the corresponding area between them and the magnetic rod 140 when passing through the magnetic rod 140, thereby ensuring that the magnetic rod 140 can complete the impurity removal more efficiently. By providing multiple guide plates 121 in the guide tube 120 and staggering the multiple guide plates 121, when the material falls into the guide tube 120, it can fall onto each guide plate 121 in a dispersed manner and slide down, thereby further enhancing the impurity removal effect. In the embodiment of the present application, a scraper plate 112 is also provided, and a first material leakage port 111a and a second material leakage port 112a are respectively provided on the scraper plate 112 and the diaphragm 111, so that the scraper plate 112 completes the silicon carbide dropping operation during the rotation process.
[0022] In some embodiments, a support drum frame 132 is externally connected to the transmission shaft 131, and a plurality of crushing rollers 133 are provided on the outer periphery of the support drum frame 132. The top end of the transmission shaft 131 passes through the top of the crushing box 110 and is connected to a first bevel gear 134. The top end of the support drum frame 132 passes through the top of the crushing box 110 and is connected to a second bevel gear 135. The first bevel gear 134 and the second bevel gear 135 are mutually meshed with a third bevel gear 136. The first bevel gear 134 is coaxially connected to a drive motor 137. In the embodiment of the present application, through the above arrangement, the drive motor 137 will respectively drive the first bevel gear 134 and the second bevel gear 135 to rotate through the third bevel gear 136, thereby causing the support drum frame 132 and the transmission shaft 131 to rotate in opposite directions around the central axis of the transmission shaft 131. During the rotation of the support drum frame 132, the crushing rollers 133 strike the silicon carbide raw material, causing the silicon carbide raw material to be crushed and decomposed into small particles.
[0023] In some embodiments, a semi-spherical scraper cover 112b is provided on the top of the scraper plate 112 at the opening of the first material leakage 111a. In the embodiment of the present application, since the support drum frame 132 and the transmission shaft 131 rotate in opposite directions, the rotation direction of the lowest crushing roller 133 and the scraper plate 112 is also opposite. As a result, the lowest crushing roller 133 can push the silicon carbide raw material into the scraper cover 112b during its rotation. The scraper cover moves in the opposite direction to the crushing roller 133, allowing the silicon carbide raw material to pass through the scraper cover 112b and fall into the opening of the first material leakage 111a.
[0024] In some embodiments, a feeding chute 113 is provided on one side of the crushing box 110 , and the feeding chute 113 is connected to the inner cavity of the crushing box 110 . The feeding chute 113 is used to add silicon carbide raw materials to the crushing box 110 .
[0025] In some embodiments, a fixing sleeve 141 is clamped at both end ports of the magnetic rod 140, and the fixing sleeve 141 is provided with an external thread. Holes are provided on both sides of the guide tube 120, and the two ends of the magnetic rod 140 are respectively passed through the holes to the outside of the guide tube 120 and then screwed with a rotating nut 142. In the embodiment of the present application, the fixing sleeve 141 can be made of elastic plastic material, and it can be an interference fit with the magnetic rod 140. During the installation process, the magnetic rod 140 is inserted through the hole on the guide tube 120 and then tightened using the rotating nut 142 so that the rotating nuts 142 on both sides respectively abut against the two sides of the guide tube 120. The above arrangement allows the magnetic rod 140 in this device to be easily disassembled for cleaning.
[0026] In some embodiments, a dust collecting device is included, and the dust collecting device includes a dust collecting hood 150. A slide rail is provided at the bottom end of the dust collecting hood 150, and a slide groove 122 that matches the slide rail is provided on the outer wall of the guide tube 120. The dust collecting hood 150 is connected to a negative pressure pipe. In the embodiment of the present application, the dust collecting hood 150 is not provided to prevent the dust from overflowing from the guide tube 120. The dust collecting hood 150 can be used to promptly remove dust that is scattered near the magnetic rod 140 on the guide tube 120. When the magnetic rod 140 is installed, the dust collecting hood 150 can be moved to a position away from the magnetic rod 140 via the slide rail without affecting normal use.
[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.
Claims
1. A jet mill for reducing the electrical conductivity of silicon carbide, characterized in that: It includes a jet mill body, one side of which is connected to a feed pipe, and the feed pipe is connected to a feeding device; The feeding device includes a crushing box, the bottom of the crushing box is connected to the feeding pipe through a transversely arranged guide tube, the guide tube is gradually inclined downward from one end close to the crushing box to one end close to the feeding pipe, a crushing device is provided inside the crushing box, the crushing device includes a vertically arranged transmission shaft, a transverse partition is provided inside the crushing box, the bottom of the transmission shaft is rotatably connected to the central axis of the transverse partition, the bottom end of the transmission shaft is connected to a scraper plate, the scraper plate is located above the transverse partition, and a plurality of mutually corresponding first and second leakage ports are respectively provided on the scraper plate and the transverse partition; A plurality of guide plates are arranged in the guide tube, and the plurality of guide plates are arranged in parallel. One ends of the plurality of guide plates extend to the bottom of the crushing box and are staggered. A plurality of magnetic rods are arranged through the guide tube, and the plurality of magnetic rods are respectively located above the plurality of guide plates.
2. The jet mill for reducing the electrical conductivity of silicon carbide according to claim 1, characterized in that: The transmission shaft is outer-connected with a supporting drum frame, and a plurality of crushing rollers are arranged on the outer periphery of the supporting drum frame. The top end of the transmission shaft passes through the top of the crushing box and is connected to the first bevel gear. The top end of the supporting drum frame passes through the top of the crushing box and is connected to the second bevel gear. The first bevel gear and the second bevel gear are jointly meshed with a third bevel gear, and the first bevel gear is coaxially connected to a drive motor.
3. The jet mill for reducing the electrical conductivity of silicon carbide according to claim 1, characterized in that: A semi-spherical scraper cover is provided on the top of the scraper plate at the first material leakage port.
4. The jet mill for reducing the electrical conductivity of silicon carbide according to claim 1, characterized in that: A feeding chute is provided on one side of the crushing box, and the feeding chute is connected to the inner cavity of the crushing box.
5. The jet mill for reducing the electrical conductivity of silicon carbide according to claim 1, characterized in that: The two end ports of the magnetic rod are both clamped with a fixed sleeve, the fixed sleeve is provided with an external thread, and holes are provided on both sides of the guide tube. The two ends of the magnetic rod are respectively passed through the holes to the outside of the guide tube and are screwed with rotating nuts.
6. The jet mill for reducing the electrical conductivity of silicon carbide according to claim 5, characterized in that: It includes a dust collecting device, which includes a dust collecting hood. The bottom end of the dust collecting hood is provided with a slide rail, the outer side wall of the guide cylinder is provided with a slide groove matching the slide rail, and the dust collecting hood is connected to a negative pressure pipe.