A microsilica fine selection device for preparing silicon nitride and a method of using the same

Abstract

The application relates to the technical field of screening devices, in particular to a micro-silicon powder fine screening device for preparing silicon nitride and a use method thereof. The micro-silicon powder fine screening device for preparing silicon nitride comprises two oppositely arranged supporting seats and a cylinder fixedly installed between the two supporting seats, and the bottom of the cylinder is provided with a through structure; the micro-silicon powder fine screening device for preparing silicon nitride further comprises a first plate, a second plate, both of which are movably arranged in the cylinder and are in sealing sliding fit with the inner wall of the cylinder, a screen for screening silicon powder is arranged on the first plate, the first plate and the second plate are connected with a power mechanism installed on the upper part of the cylinder, through mutual cooperation between various mechanisms and components, the rotation of the first plate and the second plate in the cylinder makes the screen on the first plate impact the silicon powder, accelerates the speed of the silicon powder passing through the screen, and improves the screening efficiency.

Description

Technical Field

[0001] This invention relates to the technical field of screening equipment, specifically to a fine screening device for preparing silicon nitride microsilica powder and its usage method. Background Technology

[0002] Silicon nitride is an important inorganic material with excellent properties such as high hardness, high wear resistance, high corrosion resistance, and high temperature stability, and is widely used in electronics, optoelectronics, and chemical industries. This article will introduce the production process of silicon nitride.

[0003] The production process of silicon nitride mainly includes raw material preparation, mixing, molding, sintering, and processing. The main raw materials for silicon nitride are silicon powder and ammonia. Silicon powder is a fine powdery substance, usually obtained by crushing and screening siliceous minerals such as quartz sand or silica. Typically, to ensure production efficiency, strict requirements are placed on the particle size of the silicon powder raw material; therefore, the screening (fine selection) of silicon powder is crucial.

[0004] Currently, when finely selecting silicon powder, the particle size of the untreated powder is quite small, making it difficult to use conventional sieves. Therefore, specialized equipment is generally required. Since the object being sieved is powder, the airtightness and precision requirements of the equipment are high, which is difficult for most small and medium-sized enterprises to afford. If fine mesh sieves are used, the existing screening process generally places the raw material on the sieve plate for screening. The powder particles come into contact with each other, resulting in static friction between the powder particles, which is usually greater than their weight. Therefore, the sieve needs to be vibrated or shaken. However, because silicon powder particles are small, their weight is much less than the static friction between the powder particles. Although screening can continue, its efficiency is relatively low. Secondly, in the existing screening process, the raw material is generally placed on the sieve plate for screening, and the powder particles come into contact with each other, which leads to... Summary of the Invention

[0005] The purpose of this invention is to provide a fine-selection device for preparing silicon nitride micro-silicon powder and its usage method, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A fine-selection device for preparing silicon nitride micro-silicon powder includes two opposing support seats and a cylinder fixedly installed between the two support seats, wherein the bottom of the cylinder is provided with a conductive structure.

[0008] The silicon powder fine separation device for preparing silicon nitride further includes:

[0009] The first plate and the second plate are movably disposed in the cylinder and are sealed and slidably fitted against the inner wall of the cylinder. The first plate is provided with a screen for screening silicon powder. The first plate and the second plate are connected to a power mechanism installed on the upper part of the cylinder.

[0010] The feeding mechanism, connected to the power mechanism, is used to introduce the silicon powder to be processed into the cylinder. The power mechanism can drive the first plate and the second plate to rotate in the cylinder so that the silicon powder entering the cylinder impacts the screen.

[0011] The base plate is provided on each of the two support seats and can switch the conduction and blocking states of the bottom of the cylinder. The base plate is semi-circular and adapted to the bottom of the cylinder. The base plate is connected to two sets of elastic telescopic mechanisms installed on the support seats and is also connected to the power mechanism through a centrifugal triggering mechanism.

[0012] An intermittent striking mechanism is installed at the bottom of the base plate and connected to the centrifugal triggering mechanism via a transmission mechanism. The intermittent striking mechanism can impact the base plate to cause the silicon powder in the cylinder to intermittently jump.

[0013] As a further aspect of the present invention: a mounting frame is fixedly provided on the cylinder, the power mechanism includes a drive motor mounted on the mounting frame and a rotating shaft rotatably mounted in the cylinder, the first plate and the second plate are fixedly mounted on the outer wall of the rotating shaft, and the rotating shaft is connected to the output end of the drive motor, and the rotating shaft is also connected to the feeding mechanism.

[0014] As a further embodiment of the present invention: the rotating shaft is provided with a cavity, one end of the cavity is connected to the discharge pipe provided on the outer wall of the rotating shaft, and the other end is connected to a plurality of ports provided on the rotating shaft;

[0015] The feeding mechanism includes a hopper fixed on the mounting frame, a guide tube connected to the hopper at one end, and a sleeve connected to the other end of the guide tube. The sleeve is rotatably and sealed to the rotating shaft and corresponds to a plurality of the ports.

[0016] As a further embodiment of the present invention: the elastic telescopic mechanism includes a guide cylinder fixedly installed on the side of the support seat facing the cylinder, a telescopic rod slidably disposed in the guide cylinder, and a second cylindrical spring disposed in the guide cylinder;

[0017] The telescopic rod is fixedly connected to the base plate at one end away from the support seat, and a boss is fixedly provided at the end of the telescopic rod facing the support seat. The boss is slidably connected to the inner wall of the guide cylinder. The second cylindrical spring is sleeved on the outer periphery of the telescopic rod, with one end connected to the inner wall of the guide cylinder and the other end connected to the boss.

[0018] As a further embodiment of the present invention: a first bevel gear is fixedly installed on the rotating shaft, and the centrifugal triggering mechanism includes a horizontal shaft rotatably installed on the support base, a rotating plate fixedly installed on the horizontal shaft, and a sleeve slidably sleeved on the horizontal shaft;

[0019] Wherein, a second bevel gear that meshes with the first bevel gear is fixed at one end of the horizontal shaft facing the rotating shaft, a slider is slidably provided on the rotating plate, and two push-pull rods are connected between the slider and the sleeve, and the two ends of the push-pull rods are respectively hinged to the sleeve and the slider;

[0020] The support base is also slidably provided with a connecting plate, one end of which is fixed to the base plate and the other end is rotatably connected to the sleeve.

[0021] As a further embodiment of the present invention: the intermittent striking mechanism includes multiple columns movably disposed below the base plate, an elastic assembly structure connected to the multiple columns, and an incomplete gear disposed below the base plate.

[0022] The incomplete gear is connected to the transmission mechanism, and the elastic assembly structure is connected to a rack plate that mates with the incomplete gear.

[0023] As a further embodiment of the present invention: the elastic assembly structure includes two assembly plates fixed to the bottom of the base plate, two guide columns slidably disposed on the two assembly plates respectively, and a reciprocating plate fixedly connected to the two guide columns, multiple columns fixed on the reciprocating plate, and the rack plate fixed to the reciprocating plate;

[0024] Each of the two guide posts is fitted with a first cylindrical spring, one end of which is connected to the reciprocating plate and the other end is connected to the assembly plate.

[0025] As a further embodiment of the present invention: the transmission mechanism includes a transmission tube rotatably mounted on the bottom of the base plate and a transmission shaft rotatably mounted on the side of the support seat, the incomplete gear is fixed to the side of the transmission tube facing the rack plate, and the transmission shaft is connected to the horizontal shaft through a transmission belt;

[0026] The transmission shaft is slidably fitted with the transmission tube, and the outer wall of the transmission shaft is provided with two strip-shaped protrusions, while the inner wall of the transmission tube is provided with two strip-shaped grooves that are adapted to the strip-shaped protrusions.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention has a novel design. Through the cooperation between various mechanisms and components, the rotation of the first plate and the second plate in the cylinder causes the screen on the first plate to impact the silicon powder, accelerating the speed at which the silicon powder passes through the screen and improving the screening efficiency. In addition, the intermittent striking mechanism causes the silicon powder on the bottom plate to rise, ensuring the screen's sufficient screening of the silicon powder. Furthermore, the start and stop of the power mechanism can be triggered by the centrifugal trigger mechanism to move the two bottom plates, automatically switching the blocking and opening states at the bottom of the cylinder, thereby effectively improving the automation level of the device and making it suitable for widespread use. Attached Figure Description

[0028] Figure 1 A schematic diagram of one embodiment of a micro-silicon powder fine sorting device for preparing silicon nitride.

[0029] Figure 2 A schematic diagram of another aspect of an embodiment of a micro-silicon powder fine sorting device for preparing silicon nitride.

[0030] Figure 3 A schematic diagram of the structure of a micro-silicon powder fine sorting device for preparing silicon nitride from another angle.

[0031] Figure 4 for Figure 2 Enlarged view of the structure at point A in the middle.

[0032] Figure 5 for Figure 3 Enlarged view of the structure at point B.

[0033] Figure 6 This is a schematic diagram of the feeding mechanism and power mechanism in one embodiment of a micro-silicon powder fine separation device for preparing silicon nitride.

[0034] Figure 7 A schematic diagram of the centrifugal triggering mechanism in one embodiment of a device for finely selecting silicon powder to prepare silicon nitride.

[0035] Figure 8 A schematic diagram of the intermittent tapping mechanism in one embodiment of a device for finely selecting silicon powder to prepare silicon nitride.

[0036] In the diagram: 1. Support base; 2. Cylinder; 3. Mounting frame; 4. Drive motor; 5. Rotating shaft; 501. Through port; 502. Discharge pipe; 6. First plate; 601. Screen; 7. Second plate; 8. Sleeve; 9. Guide tube; 10. Feed hopper; 11. Horizontal shaft; 12. Rotating plate; 13. Slider; 14. Sleeve; 15. Push-pull rod; 16. First bevel gear; 17. Second bevel gear; 18. Connecting plate; 19. Base plate; 20. Column; 21. Drive shaft; 2101. Strip protrusion; 22. Drive pipe; 2201. Strip groove; 23. Drive belt; 24. Incomplete gear; 25. Rack plate; 26. Assembly plate; 27. Guide column; 28. Reciprocating plate; 29. ​​First columnar spring; 30. Second columnar spring; 31. Guide cylinder; 32. Telescopic rod; 33. Boss. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Furthermore, elements in this invention are referred to as being "fixed to" or "set on" another element, which may be directly on the other element or may also include an intervening element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or may also include an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[0039] In this embodiment of the invention, a fine-selection device for preparing silicon nitride micro-silicon powder includes two opposing support seats 1 and a cylinder 2 fixedly installed between the two support seats 1, and the bottom of the cylinder 2 is provided with a conductive structure.

[0040] The micro silicon powder fine selection device for preparing silicon nitride also includes a first plate 6, a second plate 7, a screen 601, a power mechanism, a feeding mechanism, a base plate 19, an elastic telescopic mechanism, a centrifugal triggering mechanism, an intermittent knocking mechanism, and a transmission mechanism.

[0041] Through the cooperation between various mechanisms and components, the rotation of the first plate 6 and the second plate 7 in the cylinder 2 causes the screen 601 on the first plate 6 to impact the silicon powder, accelerating the speed at which the silicon powder passes through the screen 601 and improving the screening efficiency. In conjunction with the intermittent striking mechanism, the silicon powder on the bottom plate 19 can be lifted upwards, ensuring the sieving of the silicon powder by the screen 601. In addition, the start and stop of the power mechanism can cause the movement of the two bottom plates 19 through the centrifugal trigger mechanism, automatically switching the blocking and opening states at the bottom of the cylinder 2, thereby effectively improving the automation level of the device and making it suitable for widespread use.

[0042] Specifically, please refer to Figures 1-8 The following is a detailed explanation:

[0043] The first plate 6 and the second plate 7 are movably disposed in the cylinder 2, and are sealed and slidably fitted against the inner wall of the cylinder 2. The screen 601 is disposed on the first plate 6 and is used to screen the silicon powder. The first plate 6 and the second plate 7 are connected to the power mechanism installed on the upper part of the cylinder 2.

[0044] The feeding mechanism is connected to the power mechanism and is used to introduce the silicon powder to be processed into the cylinder 2. The power mechanism can drive the first plate 6 and the second plate 7 to rotate in the cylinder 2 so that the silicon powder entering the cylinder 2 impacts the screen 601.

[0045] The bottom plate 19 is provided on each of the two support seats 1, and can switch the conduction and blocking state of the bottom of the cylinder 2. The bottom plate 19 is semi-circular and adapted to the bottom of the cylinder 2. The bottom plate 19 is connected to two sets of elastic telescopic mechanisms installed on the support seats 1, and is also connected to the power mechanism through the centrifugal trigger mechanism.

[0046] The intermittent striking mechanism is installed at the bottom of the base plate 19 and is connected to the centrifugal triggering mechanism through the transmission mechanism. The intermittent striking mechanism can impact the base plate 19 to cause the silicon powder in the cylinder 2 to jump intermittently.

[0047] In actual use, when the power mechanism is activated, the power mechanism will drive the first plate 6 and the second plate 7 to rotate in the cylinder 2. At this time, the power mechanism drives the centrifugal trigger mechanism to move, and the centrifugal trigger mechanism will drive the bottom plate 19 to move away from the support seat 1. Correspondingly, the elastic telescopic mechanism stores elastic potential energy, and the two bottom plates 19 move closer to each other until they dock, so that the bottom of the cylinder 2 switches from the open state to the blocked state.

[0048] Subsequently, the staff can introduce the treated silicon powder into the cylinder 2 through the feeding mechanism. With the rotation of the first plate 6 and the second plate 7, the incoming silicon powder has an impact effect, thereby effectively increasing the rate at which the silicon powder passes through the screen 601 and achieving a high-efficiency screening function. Finally, the silicon powder that passes through the screen 601 will be pushed by the second plate 7.

[0049] At the same time, the centrifugal triggering mechanism also drives the intermittent striking mechanism to move. The intermittent striking mechanism intermittently strikes the bottom plate 19, thereby causing the silicon powder located on the bottom plate 19 in the cylinder 2 to rise, ensuring that the screen 601 can smoothly impact the silicon powder and ensuring the sufficient screening of silicon powder by the screen 601.

[0050] Therefore, the first plate 6 and the second plate 7 form a first interval and a second interval inside the cylinder 2. For example, if silicon powder that cannot pass through the sieve 601 is defined to remain in the first interval, silicon powder that can pass through the sieve 601 will enter and remain in the second interval, achieving a separation effect. In this case, the first plate 6 rotates toward the first interval, and the feeding mechanism is used to introduce the silicon powder to be processed into the first interval.

[0051] After the power mechanism has been operating for a period of time, it stops working and the first plate 6 and the second plate 7 stop rotating. At this time, the elastic telescopic mechanism releases elastic potential energy, and the two bottom plates 19 move away from each other, switching the blocking state of the bottom of the cylinder 2 to the conducting state, so that the silicon powder on the bottom plate 19 falls into the corresponding receiving container.

[0052] Furthermore, after each stop of the power mechanism, it is necessary to ensure that the first plate 6 and the second plate 7 are located in the middle of the two base plates 19, so as to ensure that the silicon powder on the two base plates 19 is different, that is, silicon powder that can pass through the screen 601 and silicon powder that cannot pass through the screen 601, so as to ensure that after the two base plates 19 move away from each other, the different silicon powders can be separated normally and enter different receiving containers.

[0053] Secondly, during actual processing, workers need to place two receiving containers below the cylinder 2. Due to the presence of the intermittent striking mechanism and the elastic telescopic mechanism, a certain distance exists between the port of the receiving container and the bottom of the cylinder 2 to avoid interference. As a result, after the silicon powder falls, it may be blown away by external factors (wind), and different silicon powders may mix together, making the screening process ineffective. Therefore, before the work begins, after the two receiving containers are placed, a windproof cover should be set up around the device to avoid the above problems.

[0054] Please refer to it again. Figure 4 and Figure 6 The cylinder 2 is fixedly provided with a mounting frame 3. The power mechanism includes a drive motor 4 mounted on the mounting frame 3 and a rotating shaft 5 rotatably mounted in the cylinder 2. The first plate 6 and the second plate 7 are fixedly mounted on the outer wall of the rotating shaft 5, and the rotating shaft 5 is connected to the output end of the drive motor 4. The rotating shaft 5 is also connected to the feeding mechanism.

[0055] The rotating shaft 5 has a cavity inside. One end of the cavity is connected to a discharge pipe 502 located on the outer wall of the rotating shaft 5, and the other end is connected to multiple ports 501 located on the rotating shaft 5. The feeding mechanism includes a hopper 10 fixed on the mounting frame 3, a guide tube 9 connected to the hopper 10 at one end, and a sleeve 8 connected to the other end of the guide tube 9. The sleeve 8 is rotatably and sealed to the rotating shaft 5 and corresponds to the multiple ports 501.

[0056] When the device is working, in order to ensure that the silicon powder entering the cylinder 2 can smoothly impact the screen 601, the way the silicon powder enters needs to meet certain requirements (i.e., the silicon powder must enter the first interval mentioned above). The feeding mechanism meets this requirement.

[0057] In detail, after the drive motor 4 is started, the two base plates 19 are in a combined state, sealing the bottom of the cylinder 2. At this time, the operator can add the silicon powder to be processed into the feeding hopper 10. Then, the silicon powder will enter the sleeve 8 along the guide tube 9, then enter the cavity in the rotating shaft 5 through the through port 501, and finally enter the cylinder 2 (i.e., the first interval mentioned above) through the discharge pipe 502.

[0058] It is important to note that the amount of silicon powder added must be controlled by the staff to avoid adding too much at once, which would result in a large amount of silicon powder entering the first interval mentioned above, making the impact effect between the subsequent screen 601 and the silicon powder poor and making it difficult to guarantee the screening effect.

[0059] Please refer to it again. Figure 8The elastic telescopic mechanism includes a guide cylinder 31 fixedly installed on the side of the support base 1 facing the cylinder 2, a telescopic rod 32 slidably disposed within the guide cylinder 31, and a second cylindrical spring 30 disposed within the guide cylinder 31. One end of the telescopic rod 32 away from the support base 1 is fixedly connected to the base plate 19, and a boss 33 is fixedly provided on the end of the telescopic rod 32 facing the support base 1. The boss 33 is slidably connected to the inner wall of the guide cylinder 31. The second cylindrical spring 30 is sleeved on the outer periphery of the telescopic rod 32, with one end connected to the inner wall of the guide cylinder 31 and the other end connected to the boss 33.

[0060] When the drive motor 4 starts, it will drive the first plate 6 and the second plate 7 to rotate in the cylinder 2 through the rotating shaft 5. At the same time, the rotating shaft 5 will drive the centrifugal trigger mechanism to move, so that the centrifugal trigger mechanism drives the bottom plate 19 to move away from the support seat 1. The two bottom plates 19 move closer to each other, switching the conduction state of the bottom of the cylinder 2 to the blocking state, ensuring the smooth progress of the screening process. Correspondingly, as the bottom plate 19 moves away from the support seat 1, the telescopic rod 32 drives the boss 33 to slide towards the outside of the guide cylinder 31, and the second columnar spring 30 is compressed.

[0061] After the drive motor 4 stops operating, the second cylindrical spring 30 will rebound, causing the boss 33 to drive the telescopic rod 32 to slide toward the inside of the guide cylinder 31. Correspondingly, the bottom plate 19 moves toward the support seat 1 to reset, and the two bottom plates 19 move away from each other, switching the blocked state of the bottom of the cylinder 2 to the open state.

[0062] Please refer to it again. Figure 2 , Figure 4 as well as Figure 7 The first bevel gear 16 is fixedly installed on the rotating shaft 5. The centrifugal triggering mechanism includes a horizontal shaft 11 rotatably installed on the support base 1, a rotating plate 12 fixedly installed on the horizontal shaft 11, and a sleeve 14 slidably sleeved on the horizontal shaft 11.

[0063] Wherein, a second bevel gear 17 that meshes with the first bevel gear 16 is fixed at one end of the horizontal shaft 11 facing the rotating shaft 5, a slider 13 is slidably provided on the rotating plate 12, and two push-pull rods 15 are connected between the slider 13 and the sleeve 14, and the two ends of the push-pull rods 15 are respectively hinged to the sleeve 14 and the slider 13.

[0064] The support base 1 is also slidably provided with a connecting plate 18, one end of which is fixed to the base plate 19, and the other end is rotatably connected to the sleeve 14.

[0065] When the drive motor 4 drives the rotating shaft 5 to rotate, the rotating shaft 5 will drive the horizontal shaft 11 to rotate through the first bevel gear 16 and the second bevel gear 17. As a result, the rotating plate 12 rotates, causing the slider 13 to generate centrifugal force. The slider 13 slides away from the horizontal shaft 11 on the rotating plate 12, and pulls the sleeve 14 to slide towards the rotating plate 12 on the horizontal shaft 11 through the two push-pull rods 15. Correspondingly, the sleeve 14 drives the bottom plate 19 to move away from the support seat 1 through the connecting plate 18 until the bottom of the cylinder 2 switches from the conducting state to the blocking state, and the second columnar spring 30 is compressed.

[0066] Conversely, after the drive motor 4 stops working, the second cylindrical spring 30 rebounds, the telescopic rod 32 drives the base plate 19 to move toward the support seat 1 to reset, the bottom of the cylinder 2 switches from a blocked state to a conductive state, the connecting plate 18 drives the sleeve 14 to slide away from the rotating plate 12 on the horizontal axis 11 to reset, and the sleeve 14 pulls the slider 13 on the rotating plate 12 toward the horizontal axis 11 through the two push-pull rods 15 to reset.

[0067] Please refer to it again. Figure 2 , Figure 5 , Figure 7 as well as Figure 8 The intermittent striking mechanism includes multiple columns 20 movably disposed below the base plate 19, an elastic assembly structure connected to the multiple columns 20, and an incomplete gear 24 disposed below the base plate 19. The incomplete gear 24 is connected to the transmission mechanism, and the elastic assembly structure is connected to a rack plate 25 that meshes with the incomplete gear 24.

[0068] The elastic assembly structure includes two assembly plates 26 fixed to the bottom of the base plate 19, two guide posts 27 slidably disposed on the two assembly plates 26 respectively, and a reciprocating plate 28 fixedly connected to the two guide posts 27. Multiple columns 20 are fixed to the reciprocating plate 28, and a rack plate 25 is fixed to the reciprocating plate 28. A first cylindrical spring 29 is sleeved on the outer periphery of each of the two guide posts 27. One end of the first cylindrical spring 29 is connected to the reciprocating plate 28, and the other end is connected to the assembly plate 26.

[0069] When the drive motor 4 drives the rotating shaft 5 to rotate, the rotating shaft 5 will drive the horizontal shaft 11 to rotate through the first bevel gear 16 and the second bevel gear 17. Then, the horizontal shaft 11 will drive the incomplete gear 24 to rotate through the transmission mechanism. When the toothed part of the incomplete gear 24 meshes with the rack plate 25, it will cause the rack plate 25 to drive the reciprocating plate 28 to move downward. Correspondingly, the first column spring 29 is further compressed. When the toothed part of the incomplete gear 24 disengages from the rack plate 25, the first column spring 29 rebounds, driving the reciprocating plate 28 and the multiple columns 20 to move upward at a relatively fast speed. The multiple columns 20 will then strike the bottom plate 19, causing the silicon powder inside the cylinder 2 and located above the bottom plate 19 to be lifted, so that the screen 601 can impact the silicon powder and ensure the thoroughness of the screening process.

[0070] The transmission mechanism includes a transmission tube 22 rotatably mounted on the bottom of the base plate 19 and a transmission shaft 21 rotatably mounted on the side of the support seat 1. The incomplete gear 24 is fixed to the side of the transmission tube 22 facing the rack plate 25. The transmission shaft 21 is connected to the horizontal shaft 11 through a transmission belt 23.

[0071] The transmission tube 22 passes through the support base 1, and the support base 1 has a through hole for the transmission tube 22 to pass through smoothly. The transmission shaft 21 is slidably fitted with the transmission tube 22, and the outer wall of the transmission shaft 21 has two strip-shaped protrusions 2101, while the inner wall of the transmission tube 22 has two strip-shaped grooves 2201 that are adapted to the strip-shaped protrusions 2101.

[0072] In detail, when the horizontal shaft 11 rotates, it will drive the transmission shaft 21 to rotate through the transmission belt 23. Then, the transmission shaft 21 can drive the transmission tube 22 to rotate through the two strip-shaped protrusions 2101 on its outer wall and the two strip-shaped grooves 2201 on the inner wall of the transmission tube 22. This will cause the incomplete gear 24 to rotate. The incomplete gear 24 will then intermittently engage with the rack plate 25 to realize the striking action of the column 20 on the base plate 19. Whenever the drive motor 4 starts or stops, that is, when the base plate 19 moves away from or closer to the support seat 1, the transmission tube 22 will slide on the transmission shaft 21.

[0073] As another embodiment of the present invention, a method for using the aforementioned silicon nitride micro-silicon powder fine selection device is also provided, comprising the following steps:

[0074] Step 1: Start the drive motor 4, which drives the first plate 6 and the second plate 7 to rotate in the cylinder 2.

[0075] Step 2: The centrifugal trigger mechanism moves, causing the two base plates 19 to move closer to each other and then remain in the docking state, switching the conducting state at the bottom of the cylinder 2 to the blocking state, and the elastic telescopic mechanism stores elastic potential energy.

[0076] Step 3: Add silicon powder to be processed into the hopper 10. The silicon powder enters the cylinder 2 and is impacted by the screen 601. Silicon powder that can pass through the screen 601 and silicon powder that cannot pass through the screen 601 are separated in the cylinder 2.

[0077] Step four: the drive motor 4 stops working, the elastic telescopic mechanism releases elastic potential energy, the two base plates 19 move away from each other and reset, switching the blocked state of the bottom of the cylinder 2 to the open state, and the silicon powder that has been screened in the cylinder 2 falls out.

[0078] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0079] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A fine selection device for preparing silicon nitride micro silicon powder, comprising two opposing support seats (1) and a cylinder (2) fixedly installed between the two support seats (1), wherein the bottom of the cylinder (2) is provided with a conductive structure; Its features are, Also includes: The first plate (6) and the second plate (7) are movably disposed in the cylinder (2) and are sealed and slidably fitted with the inner wall of the cylinder (2). The first plate (6) is provided with a screen (601) for screening silicon powder. The first plate (6) and the second plate (7) are connected to a power mechanism installed on the upper part of the cylinder (2). The feeding mechanism is connected to the power mechanism and is used to introduce the silicon powder to be processed into the cylinder (2). The power mechanism can drive the first plate (6) and the second plate (7) to rotate in the cylinder (2) so that the silicon powder entering the cylinder (2) impacts the screen (601). The base plate (19) is provided on each of the two support seats (1), and can switch the conduction and blocking state of the bottom of the cylinder (2). The base plate (19) is semi-circular and adapted to the bottom of the cylinder (2). The base plate (19) is connected to two sets of elastic telescopic mechanisms installed on the support seats (1), and is also connected to the power mechanism through a centrifugal triggering mechanism. An intermittent striking mechanism is installed at the bottom of the base plate (19) and connected to the centrifugal triggering mechanism through a transmission mechanism. The intermittent striking mechanism can impact the base plate (19) to cause the silicon powder in the cylinder (2) to jump intermittently. The cylinder (2) is fixedly provided with a mounting bracket (3), and the power mechanism includes a drive motor (4) mounted on the mounting bracket (3) and a rotating shaft (5) rotatably mounted in the cylinder (2). The first plate (6) and the second plate (7) are fixedly mounted on the outer wall of the rotating shaft (5), and the rotating shaft (5) is connected to the output end of the drive motor (4). The rotating shaft (5) is also connected to the feeding mechanism. The first bevel gear (16) is fixedly installed on the rotating shaft (5). The centrifugal triggering mechanism includes a horizontal shaft (11) rotatably installed on the support base (1), a rotating plate (12) fixedly installed on the horizontal shaft (11), and a sleeve (14) slidably sleeved on the horizontal shaft (11). Wherein, a second bevel gear (17) that meshes with the first bevel gear (16) is fixed at one end of the horizontal shaft (11) facing the rotating shaft (5), a slider (13) is slidably provided on the rotating plate (12), and two push-pull rods (15) are connected between the slider (13) and the sleeve (14), and the two ends of the push-pull rods (15) are respectively hinged to the sleeve (14) and the slider (13); A connecting plate (18) is also slidably provided on the support base (1). One end of the connecting plate (18) is fixed to the base plate (19), and the other end is rotatably connected to the sleeve (14).

2. The micro-silicon powder fine sorting device for preparing silicon nitride according to claim 1, characterized in that, The rotating shaft (5) has a cavity inside. One end of the cavity is connected to the discharge pipe (502) on the outer wall of the rotating shaft (5), and the other end is connected to multiple ports (501) on the rotating shaft (5). The feeding mechanism includes a feeding hopper (10) fixed on the mounting frame (3), a conduit (9) connected to the feeding hopper (10) at one end, and a sleeve (8) connected to the other end of the conduit (9). The sleeve (8) is sealed and rotatably connected to the rotating shaft (5) and corresponds to a plurality of ports (501).

3. The micro-silicon powder fine sorting device for preparing silicon nitride according to claim 1, characterized in that, The elastic telescopic mechanism includes a guide cylinder (31) fixedly installed on the support base (1) on the side facing the cylinder (2), a telescopic rod (32) slidably disposed in the guide cylinder (31), and a second columnar spring (30) disposed in the guide cylinder (31). The telescopic rod (32) is fixedly connected to the base plate (19) at one end away from the support seat (1), and a boss (33) is fixedly provided at one end of the telescopic rod (32) facing the support seat (1). The boss (33) is slidably connected to the inner wall of the guide cylinder (31). The second columnar spring (30) is sleeved on the outer periphery of the telescopic rod (32), and one end is connected to the inner wall of the guide cylinder (31), and the other end is connected to the boss (33).

4. The micro-silicon powder fine sorting device for preparing silicon nitride according to claim 1, characterized in that, The intermittent striking mechanism includes multiple columns (20) movably disposed below the base plate (19), an elastic assembly structure connected to the multiple columns (20), and an incomplete gear (24) disposed below the base plate (19). The incomplete gear (24) is connected to the transmission mechanism, and the elastic assembly structure is connected to a rack plate (25) that cooperates with the incomplete gear (24).

5. The micro-silicon powder fine sorting device for preparing silicon nitride according to claim 4, characterized in that, The elastic assembly structure includes two assembly plates (26) fixed to the bottom of the base plate (19), two guide columns (27) slidably disposed on the two assembly plates (26) respectively, and a reciprocating plate (28) fixedly connected to the two guide columns (27). Multiple columns (20) are fixed on the reciprocating plate (28), and the rack plate (25) is fixed to the reciprocating plate (28). Among them, a first cylindrical spring (29) is respectively sleeved on the outer periphery of the two guide columns (27). One end of the first cylindrical spring (29) is connected to the reciprocating plate (28), and the other end is connected to the assembly plate (26).

6. The micro-silicon powder fine sorting device for preparing silicon nitride according to claim 4, characterized in that, The transmission mechanism includes a transmission tube (22) rotatably mounted on the bottom of the base plate (19) and a transmission shaft (21) rotatably mounted on the side of the support base (1). The incomplete gear (24) is fixed to the side of the transmission tube (22) facing the rack plate (25). The transmission shaft (21) is connected to the horizontal shaft (11) through a transmission belt (23). The transmission shaft (21) is slidably fitted with the transmission tube (22), and the outer wall of the transmission shaft (21) is provided with two strip-shaped protrusions (2101), and the inner wall of the transmission tube (22) is provided with two strip-shaped grooves (2201) that are adapted to the strip-shaped protrusions (2101).

7. A method of using the micro-silicon powder fine sorting device for preparing silicon nitride as described in claim 1, characterized in that, Includes the following steps: Step 1: Start the drive motor (4), which drives the first plate (6) and the second plate (7) to rotate in the cylinder (2); Step 2: The centrifugal trigger mechanism moves, causing the two base plates (19) to move closer to each other and then remain in the docking state, switching the conducting state at the bottom of the cylinder (2) to the blocking state, and the elastic telescopic mechanism stores elastic potential energy. Step 3: Add silicon powder to be processed into the hopper (10). The silicon powder enters the cylinder (2) and is impacted by the screen (601). Silicon powder that can pass through the screen (601) and silicon powder that cannot pass through the screen (601) are separated in the cylinder (2). Step 4: The drive motor (4) stops working, the elastic telescopic mechanism releases elastic potential energy, the two bottom plates (19) move away from each other and reset, the blocking state of the bottom of the cylinder (2) is switched to the conducting state, and the silicon powder that has been screened in the cylinder (2) falls out.

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