Waste crushing device for silicon carbide products

Abstract

The present invention relates to a waste crushing device for silicon carbide products applied in the field of silicon carbide production, comprising a coarse crushing mechanism, wherein the feed pipe end of the coarse crushing mechanism is fixed and connected with a fine crushing barrel, a plurality of eccentric holes are opened on the circumference of the fine crushing barrel, an oblique flow pipe is fixed in each eccentric hole, and an upper end of the fine crushing barrel is fixed and connected with an air outlet pipe, an intercepting member for intercepting unqualified powder is installed at the lower end of the air outlet pipe, a screen barrel is installed in the fine crushing barrel, the upper end of the screen barrel is fixed and connected with a discharge pipe, a collecting barrel is installed in the screen barrel, a dividing plate is fixed at the lower end of the collecting barrel, a plurality of discharge ports for discharging unqualified powder are arranged on the circumference of the dividing plate, and an air distribution plate is fixedly installed at the lower end of the fine crushing barrel. By adopting the above-mentioned structures such as the fine crushing barrel, the oblique flow pipe, the intercepting member, the screen barrel, the dividing plate and the air distribution plate, the frequent wear caused by the direct use of the crushing tool is avoided, and the maintenance frequency and maintenance cost of the waste crushing device for silicon carbide products are reduced.

Description

Technical Field

[0001] The invention relates to a waste crushing device, in particular to a waste crushing device for silicon carbide products applied in the field of silicon carbide production. Background Art

[0002] Emery, also known as silicon carbide, is made of quartz sand, petroleum coke (or coal coke), sawdust (salt needs to be added when producing green silicon carbide) and other raw materials through high-temperature smelting in a resistance furnace. Silicon carbide is also a rare mineral in nature, moissanite. Silicon carbide is also known as carbon silicon stone. Silicon carbide is mainly man-made. The common method is to mix quartz sand with coke, use the silicon dioxide and petroleum coke, add salt and sawdust, put it in an electric furnace, heat it to a high temperature of about 2000℃, and obtain silicon carbide powder after various chemical process flows.

[0003] Silicon carbide has become an important abrasive due to its great hardness, but its application range exceeds that of general abrasives. It needs to be smelted and processed to extract high-quality abrasives. After the smelting and production of silicon carbide, the waste generated is not convenient to collect, and most of them are set up with recycling bins. However, the existing silicon carbide will agglomerate after production, and the agglomerated silicon carbide needs to be crushed. Most of them are equipped with filters inside the recycling devices. However, most of the existing filters are fixedly installed inside the recycling bin. The powder of silicon carbide after being crushed may accumulate on the surface of the filter, making it impossible to unload the material, resulting in poor filtering effect. In the recycling process, the crushed silicon carbide powder will accumulate at the bottom of the recycling device. Long-term accumulation can easily cause the internal space to be filled up, and the internal powder cannot be pressed.

[0004] To solve the above problems, the specification of Chinese patent CN221310820U discloses a waste recovery device for silicon carbide smelting production, including a recovery box, a discharge port is opened at the bottom end of the outer side wall of the recovery box, the outer side wall of the recovery box is fixedly connected to a bracket, the inner side wall of the bracket is fixedly connected to a motor, a gear A is fixedly connected to the output shaft of the motor, the inner wall of the recovery box is rotatably connected to two sets of crushing rollers, and the outer wall of the recovery box is rotatably connected to a gear B. When the waste recovery device for silicon carbide smelting production is in use, a triangular block A and a triangular block B are provided, and the pulley B is rotated by the pulley A, so that the triangular block A squeezes the inclined surface of the triangular block B, so that the filter disc moves downward inside the recovery box, and after the contact is cancelled, the filter disc will be restored to its original position by the elastic action of the limit spring, so as to achieve the effect of a vibrating screen and prevent silicon carbide powder from accumulating on the surface and making it inconvenient to discharge the material.

[0005] Most of the existing waste crushing devices for silicon carbide products directly crush the waste silicon carbide products through crushing rollers. In order to make the crushing more thorough and obtain the powder that meets the requirements, it is usually divided into two stages: coarse crushing and fine crushing (also known as fine grinding or fine grinding). Since silicon carbide products have great hardness, the crushing parts are greatly worn when the waste silicon carbide products are finely crushed, and the crushing parts need to be replaced frequently, which increases the maintenance cost of the device. Summary of the invention

[0006] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is how to design a waste crushing device for silicon carbide products that can reduce or avoid damage to crushing parts (especially fine crushing parts), thereby reducing the maintenance frequency of the device and further reducing maintenance costs.

[0007] In order to solve the above problems, the present invention provides a waste crushing device for silicon carbide products, comprising a coarse crushing mechanism for coarsely crushing the waste silicon carbide products, the coarse powder of the waste silicon carbide products is obtained after the coarse crushing mechanism crushes, and the feed pipe end of the coarse crushing mechanism is fixed and connected to a fine crushing barrel;

[0008] A plurality of eccentric holes evenly distributed and penetrating the fine crushing barrel are provided on the periphery of the fine crushing barrel, and an oblique flow pipe connected to the inner side of the fine crushing barrel is fixed in each eccentric hole, and the axis extension direction of the oblique flow pipe deviates from the central axis of the fine crushing barrel, and an inverted trumpet-shaped top is formed at the upper end of the fine crushing barrel, and an air outlet pipe is fixed and connected to the upper end of the fine crushing barrel;

[0009] An interception member for intercepting unqualified powder is installed at the lower end of the air outlet pipe, and the interception member allows air flow to pass through;

[0010] A screen barrel is installed in the fine crushing barrel, which is used to screen qualified powder and allow the powder to enter the screen barrel. The upper end of the screen barrel is fixed and connected to a discharge pipe for conveying qualified powder to the outside;

[0011] A collecting barrel is installed in the screen barrel, the upper end of which is fixedly passed through the top wall of the screen barrel and is located at the lower end of the air outlet pipe. The collecting barrel is used to collect unqualified powder intercepted by the interception member;

[0012] A material distribution plate is fixed at the lower end of the collecting barrel, and multiple discharge ports for discharging unqualified powder are arranged around the material distribution plate;

[0013] An air distribution plate is fixedly installed at the lower end of the fine crushing barrel, and the air distribution plate delivers spiral rising airflow to the annular chamber between the fine crushing barrel and the screen barrel, and the air distribution plate also delivers vertically rising airflow to the annular chamber between the screen barrel and the collecting barrel;

[0014] A high-pressure air pump is installed on the side of the fine crushing barrel away from the rough crushing mechanism to pump external clean air into the air distribution plate. The high-pressure air pump also transports clean air into the inclined flow pipe through a pipeline.

[0015] In the above-mentioned waste crushing device for silicon carbide products, the coarse crushing mechanism is first used to coarsely crush the silicon carbide product waste to obtain coarse powder of silicon carbide product waste, and then the coarse powder of silicon carbide product waste enters the fine crushing barrel, and at the same time, the high-pressure air pump pumps external clean air into the air distribution plate and the inclined flow tube, so that the air distribution plate conveys a spiral rising airflow into the annular chamber between the fine crushing barrel and the screen barrel, and at the same time conveys a vertically rising airflow into the annular chamber between the screen barrel and the collecting barrel. The coarse powder entering the fine crushing barrel is driven by the spiral rising airflow in the annular chamber between the fine crushing barrel and the screen barrel to move in a spiral upward motion. When it moves to the opening of the inclined flow tube, the extension direction of the axis of the inclined flow tube deviates from the central axis of the fine crushing barrel. , so that the airflow output from the oblique flow pipe and the spiral rising airflow are sheared, so that part of the coarse powder is deviated from the original movement direction and collides with other adjacent coarse powders. The coarse powders are crushed in the process of mutual collision and formed into qualified fine powders. The qualified fine powders enter the screen barrel through the screen barrel driven by the airflow output from the oblique flow pipe, and move with the vertical rising airflow in the screen barrel, and finally concentrate at the upper end of the screen barrel and are transported to the outside by the discharge pipe. The coarse powders are driven by the circulating airflow and the straight airflow to collide with themselves and thus are crushed, thereby avoiding the frequent wear caused by the direct use of the crushing tool, thereby reducing the maintenance frequency and maintenance cost of the waste crushing device for silicon carbide products.

[0016] As a further supplement to this application, the material distribution plate includes:

[0017] A connecting plate, the upper end of which is fixed and connected to the lower end of the collecting barrel;

[0018] A plurality of material distribution inclined tubes are provided, one end of each of which is integrally formed with the peripheral side of the connecting plate, and the plurality of material distribution inclined tubes are distributed in an array along the circumference of the central axis of the connecting plate;

[0019] There are also multiple discharge ports, which are respectively opened at the ends of multiple material distribution inclined pipes away from the connecting plate;

[0020] A plurality of mounting holes for the distribution inclined pipe to pass through are provided at the lower end of the screen barrel.

[0021] As a further supplement to the present application, the bottom walls of multiple inclined distribution tubes together form a distribution cone bottom, which is an upwardly protruding conical bottom plate, and the horizontal height of the highest vertex of the distribution cone bottom is lower than the horizontal height of the lower end of the collecting barrel.

[0022] As a further supplement to the present application, an inclined material guiding top is formed on the top of the screen barrel, the material guiding top is a ring-shaped inclined top plate, and the discharge pipe is fixed to the upper end of the material guiding top.

[0023] As a further supplement to the present application, the spirally ascending airflow in the cavity between the fine crushing barrel and the screen barrel moves in opposite directions to the airflow input into the fine crushing barrel through the inclined flow pipe in the same horizontal plane.

[0024] As a further supplement to the present application, the air distribution disk includes an outer ring disk and an inner air cylinder, the annular output cavity of the outer ring disk is adapted to the cavity between the fine crushing barrel and the screen barrel, the output cavity of the inner air cylinder is adapted to the cavity inside the screen barrel, the outer ring disk is fixedly sleeved on the outside of the inner air cylinder, and the inner side of the outer ring disk and the outer side of the inner air cylinder are both fixed with inclined guide vanes, and the guide vanes are provided in plurality and distributed in an array along the circumference of the central axis of the outer ring disk;

[0025] The inclination angle of the guide vane is 12 to 24 degrees.

[0026] As a further supplement to the present application, a swirl impeller is installed in the air outlet duct through a bracket. The swirl impeller rotates with the airflow passing through the air outlet duct. When the swirl impeller rotates, the airflow at the upper end of the fine crushing barrel and the air outlet duct forms an inverted vortex.

[0027] As a further supplement to the present application, the intercepting member includes an intercepting plate, which is fixed to the lower end of the air outlet pipe, and the diameter of the intercepting plate is the same as the inner diameter of the air outlet pipe. An outward-expanding trumpet-shaped opening is formed at the upper end of the collecting barrel, and the opening diameter at the upper end of the collecting barrel is larger than the inner diameter of the air outlet pipe.

[0028] In summary, firstly, the coarse crushing mechanism is used to coarsely crush the waste silicon carbide products to obtain coarse powder of the waste silicon carbide products, and then the coarse powder of the waste silicon carbide products enters the fine crushing barrel, and at the same time, the high-pressure air pump pumps external clean air into the air distribution plate and the inclined flow tube, so that the air distribution plate conveys a spiral rising airflow to the annular chamber between the fine crushing barrel and the screen barrel, and at the same time conveys a vertically rising airflow to the annular chamber between the screen barrel and the collecting barrel. The coarse powder entering the fine crushing barrel is driven by the spiral rising airflow in the annular chamber between the fine crushing barrel and the screen barrel to move in a spiral upward motion. When it moves to the opening of the inclined flow tube, the axial extension direction of the inclined flow tube deviates from the central axis of the fine crushing barrel, which makes the inclined flow tube The airflow output from the outlet is sheared with the spiral rising airflow, so that part of the coarse powder is deviated from the original movement direction and collides with other adjacent coarse powders. The coarse powders are crushed in the process of mutual collision and form qualified fine powders. The qualified fine powders enter the screen barrel through the screen barrel driven by the airflow output from the inclined flow pipe, and move with the vertical rising airflow in the screen barrel, and finally concentrate at the upper end of the screen barrel and are transported to the outside by the discharge pipe. The coarse powders are driven by the circulating airflow and the straight conveying airflow to collide with themselves and thus crushed, thereby avoiding the frequent wear caused by the direct use of the crushing tool, thereby reducing the maintenance frequency and maintenance cost of the waste crushing device for silicon carbide products;

[0029] The unqualified coarse powder is intercepted by the screen barrel and rises to the top of the fine crushing barrel with the spiral rising airflow, and gathers in the middle of the fine crushing barrel along the inclined inner wall of the top of the fine crushing barrel, and is finally intercepted by the intercepting piece. The intercepted coarse powder falls into the collecting barrel below, and further falls into the dividing plate through the collecting barrel, and is finally evenly distributed at the bottom of the annular cavity between the fine crushing barrel and the screen barrel through multiple discharge ports of the dividing plate, so that it is driven by the spiral rising airflow to move in a spiral upward motion again, and then enters the fine crushing program again, thereby realizing automatic and repeated crushing of the coarse powder, improving the crushing effect of the waste crushing device for silicon carbide products, ensuring that the powder output by the waste crushing device for silicon carbide products is qualified products, and greatly improving the practicability of the waste crushing device for silicon carbide products. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the three-dimensional structure of the first embodiment of the present application;

[0031] Figure 2 This is a cross-sectional view of the first embodiment of the present application;

[0032] Figure 3 This is a top cross-sectional view of the fine crushing barrel and the inclined flow pipe of the first embodiment of the present application;

[0033] Figure 4 This is a cross-sectional view of the screen barrel according to the first embodiment of the present application;

[0034] Figure 5 This is a schematic diagram of the structure of the material distribution plate of the first embodiment of the present application;

[0035] Figure 6 This is a cross-sectional view of the material distribution plate of the first embodiment of the present application;

[0036] Figure 7 This is a schematic diagram of the structure of the gas distribution disk of the first embodiment of the present application;

[0037] Figure 8 This is a schematic diagram of the movement of airflow and part of silicon carbide powder during pulverization in the first embodiment of the present application;

[0038] Fig. 9 This is a schematic top view of the airflow movement during pulverization in the first embodiment of the present application.

[0039] Description of the numbers in the figure:

[0040] 1. Coarse crushing mechanism; 2. Fine crushing barrel; 201. Oblique flow pipe; 202. Air outlet pipe; 203. Eccentric hole; 3. High-pressure air pump; 4. Air distribution plate; 401. Outer ring plate; 402. Inner air duct; 403. Guide vane; 5. Screen barrel; 501. Discharge pipe; 502. Mounting hole; 503. Material guide inclined top; 6. Collecting barrel; 7. Distribution plate; 701. Connecting plate; 702. Distribution inclined pipe; 703. Discharge port; 704. Distribution cone bottom; 8. Swirl impeller; 9. Interceptor plate. DETAILED DESCRIPTION

[0041] An implementation method of the present application is described in detail below with reference to the accompanying drawings.

[0042] The first implementation method:

[0043] The present invention provides a waste crushing device for silicon carbide products, please refer to Figure 1-3 and Figure 5 , comprising a coarse crushing mechanism 1 for coarsely crushing the silicon carbide product waste, the coarse powder of the silicon carbide product waste is obtained after the coarse crushing mechanism 1 is crushed, and the feeding pipe end of the coarse crushing mechanism 1 is fixed and connected with a fine crushing barrel 2;

[0044] A plurality of eccentric holes 203 evenly distributed and penetrating the fine crushing barrel 2 are provided on the periphery of the fine crushing barrel 2. An oblique flow pipe 201 connected to the inner side of the fine crushing barrel 2 is fixed in each eccentric hole 203. The axis extension direction of the oblique flow pipe 201 deviates from the central axis of the fine crushing barrel 2. An inverted trumpet-shaped top is formed at the upper end of the fine crushing barrel 2. An air outlet pipe 202 is fixed and connected to the upper end of the fine crushing barrel 2.

[0045] An interception member for intercepting unqualified powder is installed at the lower end of the air outlet pipe 202, and the interception member allows air flow to pass through;

[0046] A screen barrel 5 is installed in the fine crushing barrel 2, and the screen barrel 5 is used to screen qualified powder materials and allow the powder materials to enter the screen barrel 5. The upper end of the screen barrel 5 is fixed and connected to a discharge pipe 501 for conveying qualified powder materials to the outside;

[0047] A collecting barrel 6 is installed in the screen barrel 5. The upper end of the collecting barrel 6 is fixedly passed through the top wall of the screen barrel 5 and is located at the lower end of the air outlet pipe 202. The collecting barrel 6 is used to collect unqualified powder intercepted by the interception member.

[0048] A material distribution plate 7 is fixed at the lower end of the collecting barrel 6, and a plurality of discharge ports 703 for discharging unqualified powder are arranged around the material distribution plate 7;

[0049] An air distribution plate 4 is fixedly installed at the lower end of the fine crushing barrel 2, and the air distribution plate 4 delivers a spirally rising airflow to the annular chamber between the fine crushing barrel 2 and the screen barrel 5. The air distribution plate 4 also delivers a vertically rising airflow to the annular chamber between the screen barrel 5 and the collecting barrel 6;

[0050] A high-pressure air pump 3 for pumping external clean air into the air distribution plate 4 is installed on the side of the fine crushing barrel 2 away from the rough crushing mechanism 1. The high-pressure air pump 3 also transports clean air into the inclined flow pipe 201 through a pipeline.

[0051] Based on the above structure, the coarse crushing mechanism 1 is first used to coarsely crush the silicon carbide product waste to obtain coarse powder of the silicon carbide product waste, and then the coarse powder of the silicon carbide product waste enters the fine crushing barrel 2, and at the same time, the high-pressure air pump 3 pumps external clean air into the air distribution plate 4 and the inclined flow pipe 201, so that the air distribution plate 4 conveys a spiral rising airflow to the annular chamber between the fine crushing barrel 2 and the screen barrel 5, and at the same time, it also conveys a vertically rising airflow to the annular chamber between the screen barrel 5 and the collecting barrel 6. The coarse powder entering the fine crushing barrel 2 is driven by the spiral rising airflow in the annular chamber between the fine crushing barrel 2 and the screen barrel 5 to move in a spiral upward motion. When it moves to the opening of the inclined flow pipe 201, the extension direction of the axis of the inclined flow pipe 201 deviates from the central axis of the fine crushing barrel 2. The airflow output from the oblique flow pipe 201 is sheared with the spiral rising airflow, so that part of the coarse powder material deviates from the original movement direction and collides with other adjacent coarse powder materials. The coarse powder materials are crushed in the process of mutual collision and form qualified fine powder materials. The qualified fine powder materials enter the screen barrel 5 through the screen barrel 5 driven by the airflow output from the oblique flow pipe 201, and move with the vertical rising airflow in the screen barrel 5, and finally concentrate at the upper end of the screen barrel 5 and are transported to the outside by the discharge pipe 501. The coarse powder materials are driven by the circulating airflow and the straight conveying airflow to collide with themselves and thus crushed, thereby avoiding the frequent wear caused by the direct use of the crushing tool, thereby reducing the maintenance frequency and maintenance cost of the waste crushing device for silicon carbide products;

[0052] The unqualified coarse powder is intercepted by the screen barrel 5 and rises to the top of the fine crushing barrel 2 with the spiral rising airflow, and gathers in the middle of the fine crushing barrel 2 along the inclined inner wall of the top of the fine crushing barrel 2, and is finally intercepted by the intercepting piece. The intercepted coarse powder falls into the collecting barrel 6 below, and further falls into the dividing plate 7 through the collecting barrel 6, and is finally evenly distributed at the bottom of the annular cavity between the fine crushing barrel 2 and the screen barrel 5 by multiple discharge ports 703 of the dividing plate 7, so that it is again driven by the spiral rising airflow to move in a spiral upward motion, and then enters the fine crushing program again, thereby realizing automatic and repeated crushing of the coarse powder, improving the crushing effect of the waste crushing device for silicon carbide products, ensuring that the powder output by the waste crushing device for silicon carbide products is qualified products, and greatly improving the practicability of the waste crushing device for silicon carbide products.

[0053] Figure 2 , Figure 5 and Figure 6 The material distribution tray 7 is shown to include:

[0054] A connecting plate 701, the upper end of which is fixed and connected to the lower end of the collecting barrel 6;

[0055] A plurality of material distribution inclined tubes 702 are provided, and one end of each of the material distribution inclined tubes 702 is integrally formed with the peripheral side of the connecting disk 701. The plurality of material distribution inclined tubes 702 are distributed in an array along the circumference of the central axis of the connecting disk 701;

[0056] There are also multiple discharge ports 703, which are respectively opened at the ends of the multiple material distribution inclined pipes 702 away from the connection plate 701;

[0057] The lower end of the screen barrel 5 is provided with a plurality of mounting holes 502 for the material distribution inclined pipe 702 to penetrate;

[0058] The bottom walls of the plurality of material distribution inclined tubes 702 together form a material distribution cone bottom 704 . The material distribution cone bottom 704 is a conical bottom plate protruding upward. The horizontal height of the highest vertex of the material distribution cone bottom 704 is lower than the horizontal height of the lower end of the collecting barrel 6 .

[0059] Through the setting of the dividing plate 7, the coarse powder falling in the collecting barrel 6 falls into the connecting plate 701, and is evenly dispersed and spread by the dividing cone bottom 704 in the connecting plate 701, thereby entering the multiple dividing inclined tubes 702, and finally being evenly discharged from the multiple discharge ports 703 at the ends of the multiple dividing inclined tubes 702, so as to achieve the purpose of evenly distributing the collected unqualified coarse powder at the bottom of the annular cavity between the fine crushing barrel 2 and the screen barrel 5, so that the unqualified coarse powder can evenly participate in the next fine crushing process, which is beneficial to make the coarse powder evenly distributed, achieve the effect of uniform crushing, enhance the cyclic crushing effect, reduce the number and time of crushing cycles, and help to speed up the production efficiency of the waste crushing device for silicon carbide products.

[0060] Figure 2 and Figure 4 It is shown that an inclined material guiding top 503 is formed on the top of the screen barrel 5, and the material guiding top 503 is a ring-shaped inclined top plate. The discharge pipe 501 is fixed to the upper end of the material guiding top 503, which is conducive to concentrating qualified fine powder materials and conveying and discharging them through the discharge pipe 501, thereby facilitating the discharge of materials.

[0061] Figure 8-Figure 9 It is shown that the spiral rising airflow in the cavity between the fine crushing barrel 2 and the screen barrel 5 moves in opposite directions to the airflow input into the fine crushing barrel 2 by the oblique flow pipe 201 in the same horizontal plane, which can make the coarse powder moving with the spiral rising airflow and the coarse powder moving with the airflow input by the oblique flow pipe 201 form reverse movement, thereby forming a stronger collision between the coarse powders and achieving an efficient crushing effect.

[0062] Figure 2 and Figure 7 It is shown that the air distribution disk 4 includes an outer ring disk 401 and an inner air cylinder 402. The annular output cavity of the outer ring disk 401 is adapted to the cavity between the fine crushing barrel 2 and the screen barrel 5. The output cavity of the inner air cylinder 402 is adapted to the cavity inside the screen barrel 5. The outer ring disk 401 is fixedly sleeved on the outside of the inner air cylinder 402. The inner side of the outer ring disk 401 and the outer side of the inner air cylinder 402 are both fixed with obliquely arranged guide vanes 403. The guide vanes 403 are provided in plurality and are distributed in an array along the circumference of the central axis of the outer ring disk 401.

[0063] The inclination angle of the guide vane 403 is 12 to 24°;

[0064] When the airflow enters the outer ring disk 401, the guide vanes 403 on the outer ring disk 401 and the inner wind tube 402 guide the airflow, so that the airflow forms a spiral rising airflow, thereby achieving the effect of driving the coarse powder material to spirally rise after entering the fine crushing barrel 2; when the airflow enters the inner wind tube 402, it moves directly upward through the inner wind tube 402, thereby forming a straight rising airflow, achieving the effect of driving the qualified fine powder material to rise and concentrate it on the top of the screen barrel 5 and finally discharge it to the outside through the discharge pipe 501.

[0065] Figure 2 It is shown that a swirl impeller 8 is installed in the air outlet pipe 202 through a bracket. The swirl impeller 8 rotates with the airflow passing through the air outlet pipe 202. When the swirl impeller 8 rotates, the airflow at the upper end of the fine crushing barrel 2 and in the air outlet pipe 202 forms an inverted vortex. Through the arrangement of the swirl impeller 8, it can cooperate with the spiral rising airflow in the fine crushing barrel 2, so that the coarse powder maintains a spiral rising movement trend, avoiding the coarse powder from falling due to insufficient power when it rises to the upper end of the fine crushing barrel 2.

[0066] The intercepting member includes an intercepting plate 9, which is a filter mesh plate with a smaller aperture. The intercepting plate 9 is fixed to the lower end of the air outlet pipe 202, and the diameter of the intercepting plate 9 is the same as the inner diameter of the air outlet pipe 202. An outward-expanding trumpet-shaped opening is formed at the upper end of the collecting barrel 6, and the opening diameter at the upper end of the collecting barrel 6 is larger than the inner diameter of the air outlet pipe 202.

[0067] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A waste crushing device for silicon carbide products, comprising a coarse crushing mechanism (1) for coarsely crushing waste silicon carbide products, wherein the coarse crushing mechanism (1) obtains coarse powder of the waste silicon carbide products after crushing, and the discharge pipe end of the coarse crushing mechanism (1) is fixed and connected to a fine crushing barrel (2), characterized in that: A plurality of eccentric holes (203) are evenly distributed and penetrate the fine crushing barrel (2) on the circumference of the fine crushing barrel (2); an oblique flow pipe (201) connected to the inner side of the fine crushing barrel (2) is fixed in each of the eccentric holes (203); the axis extension direction of the oblique flow pipe (201) deviates from the central axis of the fine crushing barrel (2); an inverted trumpet-shaped top is formed at the upper end of the fine crushing barrel (2); and an air outlet pipe (202) is fixed and connected to the upper end of the fine crushing barrel (2); An interception member for intercepting unqualified powder is installed at the lower end of the air outlet pipe (202), and the interception member allows air flow to pass through; A screen barrel (5) is installed in the fine crushing barrel (2), and the screen barrel (5) is used to screen qualified powder materials and allow the powder materials to enter the screen barrel (5). The upper end of the screen barrel (5) is fixed and connected to a discharge pipe (501) for conveying qualified powder materials to the outside; A collecting barrel (6) is installed in the screen barrel (5), the upper end of the collecting barrel (6) is fixedly passed through the top wall of the screen barrel (5) and is located at the lower end of the air outlet pipe (202), and the collecting barrel (6) is used to collect unqualified powder intercepted by the interception member; A material distribution plate (7) is fixed at the lower end of the collecting barrel (6), and a plurality of discharge ports (703) for discharging unqualified powder are arranged on the circumference of the material distribution plate (7); An air distribution plate (4) is fixedly mounted at the lower end of the fine crushing barrel (2), and the air distribution plate (4) delivers a spirally ascending airflow into the annular chamber between the fine crushing barrel (2) and the screen barrel (5), and the air distribution plate (4) also delivers a vertically ascending airflow into the annular chamber between the screen barrel (5) and the collecting barrel (6); A high-pressure air pump (3) for pumping external clean air into the air distribution plate (4) is installed on the side of the fine crushing barrel (2) away from the coarse crushing mechanism (1), and the high-pressure air pump (3) also transports clean air into the inclined flow pipe (201) through a pipeline; The air distribution disk (4) comprises an outer ring disk (401) and an inner wind tube (402); the annular output cavity of the outer ring disk (401) is adapted to the cavity between the fine crushing barrel (2) and the screen barrel (5); the output cavity of the inner wind tube (402) is adapted to the cavity inside the screen barrel (5); the outer ring disk (401) is fixedly sleeved on the outside of the inner wind tube (402); the inner side of the outer ring disk (401) and the outer side of the inner wind tube (402) are both fixed with guide vanes (403) arranged obliquely; a plurality of guide vanes (403) are arranged and distributed in an array along the circumference of the central axis of the outer ring disk (401); The inclination angle of the guide vane (403) is 12 to 24 degrees.

2. The waste crushing device for silicon carbide products according to claim 1, characterized in that: The material distribution plate (7) comprises: A connecting plate (701), the upper end of which is fixed to and connected with the lower end of the collecting barrel (6); A material distribution inclined tube (702), wherein a plurality of the material distribution inclined tubes (702) are provided and one end of each of the plurality of material distribution inclined tubes (702) is integrally formed with the peripheral side of the connection disk (701), and the plurality of the material distribution inclined tubes (702) are distributed in an array along the circumference of the central axis of the connection disk (701); The material discharge ports (703) are also provided in plurality and are respectively provided at the ends of the plurality of material distribution inclined pipes (702) away from the connection plate (701); The lower end of the screen barrel (5) is provided with a plurality of mounting holes (502) for the material distribution inclined pipe (702) to pass through.

3. The waste crushing device for silicon carbide products according to claim 2, characterized in that: The bottom walls of the plurality of material distribution inclined tubes (702) together form a material distribution cone bottom (704), and the material distribution cone bottom (704) is a conical bottom plate protruding upward, and the horizontal height of the highest vertex of the material distribution cone bottom (704) is lower than the horizontal height of the lower end of the collecting barrel (6).

4. The waste crushing device for silicon carbide products according to claim 1, characterized in that: The top of the screen barrel (5) forms an inclined material guiding top (503), and the material guiding top (503) is a ring-shaped inclined top plate. The discharge pipe (501) is fixed to the upper end of the material guiding top (503).

5. The waste crushing device for silicon carbide products according to claim 1, characterized in that: The spirally ascending airflow in the cavity between the fine crushing barrel (2) and the screen barrel (5) moves in opposite directions to the airflow input into the fine crushing barrel (2) through the inclined flow pipe (201) within the same horizontal plane.

6. The waste crushing device for silicon carbide products according to claim 1, characterized in that: A swirl impeller (8) is installed in the air outlet pipe (202) via a bracket. The swirl impeller (8) rotates along with the airflow passing through the air outlet pipe (202). When the swirl impeller (8) rotates, the airflow at the upper end of the fine crushing barrel (2) and in the air outlet pipe (202) forms an inverted vortex.

7. The waste crushing device for silicon carbide products according to claim 1, characterized in that: The intercepting member comprises an intercepting plate (9), the intercepting plate (9) is fixed to the lower end of the air outlet pipe (202), and the diameter of the intercepting plate (9) is the same as the inner diameter of the air outlet pipe (202); the upper end of the collecting barrel (6) forms an outwardly flared trumpet-shaped opening, and the opening diameter of the upper end of the collecting barrel (6) is larger than the inner diameter of the air outlet pipe (202).

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