Reactor for synthesizing silicon nitride powder

Abstract

The application provides a reactor for synthesizing silicon nitride powder, and relates to the technical field of silicon nitride production, which comprises a base, wherein a silicon block smashing ball milling mechanism, a reactor main body, a silicon nitride powder block ball milling mechanism and a specification screening mechanism are arranged on the base; a smashing diameter particle screening plate and a ball milling diameter particle screening net are arranged in the silicon block smashing ball milling mechanism. The silicon block is first smashed to a preset diameter particle, and then ball milling is performed. The step of smashing is added before ball milling, which greatly shortens the time for ball milling. Meanwhile, the ball milling diameter particle screening net is arranged, so that the diameter particle of the silicon powder can be screened, and the diameter particle of the silicon powder is automatically dropped into a conveying auger when the diameter particle reaches the preset diameter particle. The design of the specification screening mechanism can screen the specifications of Si3N4 fine powder, and the Si3N4 fine powder with different specifications can be classified and packed, so that the delivery quality of the silicon nitride powder is improved.

Description

Technical Field

[0001] This invention relates to the field of silicon nitride production technology, specifically to a reactor for synthesizing silicon nitride powder. Background Technology

[0002] Silicon nitride (Si3N4) is an important ceramic structural material with characteristics such as low density and coefficient of thermal expansion, high hardness, high elastic modulus, and good thermal stability, chemical stability and electrical insulation. In addition, it is also corrosion resistant, oxidation resistant and has a low coefficient of surface friction. It is widely used in metallurgy, chemical industry, machinery, aviation, aerospace and energy fields.

[0003] The synthesis and preparation methods of silicon nitride include: direct nitriding of silicon powder, carbothermal reduction, thermal decomposition, sol-gel method, chemical vapor deposition, and self-propagating method. Among them, the direct nitriding of silicon powder has a simple process flow, low equipment requirements, and abundant raw material sources (polycrystalline silicon or monocrystalline silicon), making it the lowest cost method among all synthesis methods. The synthesis method involves placing silicon powder in a preparation gas (ammonia or nitrogen) and directly nitriding it at high temperature to form Si3N4 powder blocks.

[0004] The reaction equation is:

[0005] 3Si + 2N₂ → Si₃N₄;

[0006] 3Si + 4NH3 → Si3N4 + 6H2;

[0007] Process flow diagram (as attached) Figure 7 (as shown);

[0008] This method has the following main drawbacks:

[0009] (1) Before nitriding, bulk silicon needs to be ball-milled. The ball milling process usually involves directly mixing the bulk silicon with steel balls and stirring continuously to achieve ball milling of the material to be milled. This method has low grinding efficiency, which reduces the preparation efficiency of the direct nitriding synthesis method of silicon powder.

[0010] (2) If the silicon powder particle size is larger than the preset particle size after ball milling, the efficiency of subsequent reactions will be reduced. If the silicon powder particle size is much smaller than the preset particle size, a lot of time will be wasted in the ball milling stage, reducing the processing efficiency of Si3N4 powder. Therefore, after ball milling, it is usually determined by visual observation whether the silicon powder particle size has reached the preset particle size, so as to determine whether to proceed to the next step. However, the criteria for visual observation are inconsistent and the staff needs to observe intermittently, which is time-consuming and laborious.

[0011] (3) The Si3N4 powder obtained from the reaction has a wide particle size distribution and needs to be further ground to meet the quality requirements. The conventional method is to grind the Si3N4 powder for a certain period of time and then start discharging. However, grinding for a certain period of time cannot completely guarantee that the Si3N4 powder reaches the preset particle size. The working state of the machine and the size of the grinding balls will affect the final particle size of the Si3N4 powder. If the powder is discharged after grinding for a certain period of time, the powders of different particle sizes will be mixed together, which will seriously affect the quality of the silicon nitride powder leaving the factory.

[0012] If the above-mentioned shortcomings of the direct nitridation synthesis method of silicon powder can be solved, coupled with the fact that the direct nitridation synthesis method of silicon powder itself has a simple process, low equipment requirements, and abundant raw material sources such as polycrystalline silicon or monocrystalline silicon, this method will greatly reduce the preparation cost of silicon nitride. Therefore, this invention provides a reactor for synthesizing silicon nitride powder. Summary of the Invention

[0013] The present invention provides a reactor for synthesizing silicon nitride powder, thereby solving at least one of the technical problems mentioned in the background art.

[0014] To solve the above-mentioned technical problems, the present invention discloses a reactor for synthesizing silicon nitride powder, including a base, a silicon block crushing and milling mechanism, a reactor body, a silicon nitride powder block milling mechanism, and a specification screening mechanism. The outlet end of the silicon block crushing and milling mechanism is connected to the inlet end of the conveying auger, the outlet end of the conveying auger is used to connect to the inlet end of the reactor body, the outlet end of the reactor body is connected to the inlet end of the silicon nitride powder block milling mechanism, and the outlet end of the silicon nitride powder block milling mechanism is connected to the inlet end of the specification screening mechanism.

[0015] The silicon block crushing ball mill mechanism is equipped with a crushing particle screening plate and a ball milling particle screening screen.

[0016] Preferably, the silicon block crushing ball mill mechanism includes an anti-clogging cylinder, which is fixedly connected to the crushing ball mill mechanism housing. A silicon block feed funnel is fixedly connected to the anti-clogging cylinder. An anti-clogging distribution roller is rotatably connected inside the anti-clogging cylinder. A crushing particle screening plate is slidably connected to the crushing ball mill mechanism housing. The crushing particle screening plate divides the interior of the crushing ball mill mechanism housing into a crushing chamber and a ball milling chamber. A crushing component is provided in the crushing chamber, and a ball milling component is provided in the ball milling chamber. An electric sector tooth is rotatably connected to the crushing ball mill mechanism housing. The electric sector tooth is used to mesh with the crushing particle screening plate.

[0017] Preferably, the anti-clogging distribution roller includes an electric distribution roller shaft and several distribution blades fixedly connected to the electric distribution roller shaft, and the distribution blades have a V-shaped cross section.

[0018] Preferably, the crushing assembly includes an electric crushing roller, which is rotatably connected inside the crushing chamber. Two symmetrically arranged electric turntables are rotatably connected to the front and rear sides of the crushing chamber. A push rod is hinged to the electric turntable, and a guillotine block is hinged to the end of the push rod away from the electric turntable. The guillotine block is slidably connected inside the crushing ball mill housing and is used to cooperate with the electric crushing roller.

[0019] Preferably, the ball mill assembly includes a drive roller and several roller shafts rotatably connected within the ball mill chamber. The drive roller is coaxial with an electric fan-shaped gear. An execution roller and a roller are fixedly connected to the roller shafts. An intermediate pulley is fixedly connected to the leftmost roller shaft. The intermediate pulley is connected to the drive roller via a first transmission belt. Several execution rollers are connected via a second transmission belt. Two symmetrically arranged guide plates are provided on the inner wall of the ball mill chamber below the rollers. A silicon block ball mill is rotatably connected below the guide plates. A ball mill particle size screening screen is set on the silicon block ball mill. The bottom surface of the crushing and grinding mechanism housing is inclined.

[0020] Preferably, the conveying auger includes an auger shell, an auger body rotatably connected inside the auger shell, a first guide rod fixedly connected inside the outlet end of the auger shell, a first conical plug slidably connected to the first guide rod, a T-shaped feed pipe slidably connected to the reactor body, an L-shaped push rod fixedly connected to the inner wall of the T-shaped feed pipe, a first electromagnet fixedly connected to the inner wall of the reactor body, a second electromagnet fixedly connected to the T-shaped feed pipe, the first electromagnet and the second electromagnet being connected by a reset elastic element, a connecting rod fixedly connected to the first electromagnet, and a second conical plug fixedly connected to the end of the connecting rod away from the first electromagnet.

[0021] Preferably, the base is equipped with a drive assembly for driving the silicon nitride powder block ball milling mechanism and the specification screening mechanism, and simultaneously driving the reactor body to rotate. The drive assembly includes a linear motor, which is fixedly connected to the base. A connecting plate is fixedly connected to the output end of the linear motor, and a drive motor is fixedly connected to the connecting plate. The motor is equipped with a first output shaft and a second output shaft, which are rotatably connected to the base. A first variable diameter shaft is rotatably connected to the base and is used to mesh with the first output shaft. A first bevel gear and a first rotary gear are fixedly connected to the first variable diameter shaft. A first rotary shaft is rotatably connected to the base, and a second rotary gear and a third rotary gear are fixedly connected to its two ends, respectively. A first rotary gear ring is fixedly connected to the reactor body. The second rotary gear meshes with the first rotary gear, and the first rotary gear ring meshes with the third rotary gear.

[0022] Preferably, the reactor body is equipped with a stirring paddle.

[0023] Preferably, a second variable diameter shaft and a second rotating shaft are rotatably connected inside the base. The second variable diameter shaft is used to mesh with the second output shaft. A second bevel gear is fixedly connected to the second variable diameter shaft. A third bevel gear and a ball milling mechanism meshing gear are fixedly connected to the second rotating shaft. A second rotating meshing gear ring is fixedly connected to the cylinder of the silicon nitride powder block ball milling mechanism. The ball milling mechanism meshing gear and the second rotating meshing gear ring mesh with each other.

[0024] Preferably, the specification screening mechanism includes a specification screening mechanism housing, a powder stirring paddle inside the specification screening mechanism housing, the outlet end of the silicon nitride powder block ball milling mechanism located inside the specification screening mechanism housing, a first gear fixedly connected to the powder stirring paddle, a third rotating shaft rotatably connected inside the base, a second gear and a third gear fixedly connected to the third rotating shaft, a fourth gear fixedly connected to the second variable diameter rotating shaft, the first gear being used to mesh with the second gear, the third gear being used to mesh with the fourth gear, a negative pressure chamber being provided inside the specification screening mechanism housing, a negative pressure channel being provided on the negative pressure chamber, a baffle screen being provided at the negative pressure channel, a negative pressure generating component being provided at the end of the negative pressure channel away from the baffle screen, and a powder outlet being provided at the bottom of the negative pressure chamber.

[0025] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The present invention first crushes the silicon block to a preset particle size and then ball mills it. The addition of a crushing step before ball milling greatly shortens the ball milling time. At the same time, a ball mill particle size screening screen is set up to screen the silicon powder particles and ensure that the silicon powder particles automatically fall into the conveying auger when they reach the preset particle size.

[0028] 2. The design of the specification screening mechanism can screen Si3N4 fine powder by specification and classify and package Si3N4 fine powder of different specifications, thereby improving the quality of silicon nitride powder leaving the factory. Attached Figure Description

[0029] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0030] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 A schematic diagram of the silicon block crushing ball mill mechanism of the present invention;

[0032] Figure 3 For the present invention Figure 2 Sectional view at BB;

[0033] Figure 4 For the present invention Figure 1 A schematic diagram of the structure at point A;

[0034] Figure 5 This is a schematic diagram of the installation of the silicon nitride powder block ball milling mechanism and the specification screening mechanism of the present invention;

[0035] Figure 6 For the present invention Figure 5 A schematic diagram of the structure at point C.

[0036] Figure 7 This is a process flow diagram of the existing technology.

[0037] In the diagram: 1. Base; 2. Silicon block crushing ball mill mechanism; 200. Crushing particle size screening plate; 2000. Ball mill particle size screening screen; 2001. Anti-clogging cylinder; 2002. Crushing ball mill mechanism housing; 2003. Silicon block feed funnel; 2004. Anti-clogging distribution roller; 2005. Crushing chamber; 2006. Ball mill chamber; 2007. Electric sector tooth; 2008. Electric distribution roller shaft; 2009. Distribution blade; 201. Electric crushing roller; 2010. Electric turntable; 2011. Pusher 1. Connecting rod; 2. Cutter block; 2. Rolling shaft; 2. Rolling pulley; 2. Rolling roller; 2. First drive belt; 2. Intermediate pulley; 2. Second drive belt; 2. Guide plate; 2. Silicon block ball mill; 2. Silicon block feed electric gate; 3. Reactor body; 4. Silicon nitride powder block ball milling mechanism; 4. Silicon nitride powder block feed electric gate; 4. Silicon nitride powder block ball milling mechanism cylinder; 4. Silicon nitride powder screen. 5. Specification screening mechanism; 6. Conveying auger; 600. Auger housing; 6000. Auger body; 6001. First guide rod; 6002. First conical plug; 6003. T-shaped feed pipe; 6004. L-shaped push rod; 6005. First electromagnet; 6006. Second electromagnet; 6007. Reset elastic element; 6008. Connecting rod; 6009. Second conical plug; 7. Linear motor; 700. Connecting plate; 7000. Motor; 7001. First output shaft; 7002, Second output shaft; 7003, First bevel gear; 7004, First variable diameter shaft; 7005, First rotary gear; 7006, First shaft; 7007, Second rotary gear; 7008, Third rotary gear; 7009, First rotary gear ring; 701, Second variable diameter shaft; 7010, Second bevel gear; 7011, Second shaft; 7012, Third bevel gear; 7013, Meshing gear of ball mill mechanism; 7014, Second rotary meshing gear ring; 8, Agitator. Detailed Implementation

[0038] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0039] Furthermore, in this invention, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the invention. They are merely used to distinguish components or operations described using the same technical terms and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions and features of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If a combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0040] The present invention provides the following embodiments.

[0041] Example 1

[0042] This invention provides a reactor for synthesizing silicon nitride powder, such as... Figure 1-6 As shown, the system includes a base 1, on which a silicon block crushing and grinding mechanism 2, a reactor body 3, a silicon nitride powder block grinding mechanism 4, and a specification screening mechanism 5 are mounted. The outlet end of the silicon block crushing and grinding mechanism 2 is connected to the inlet end of the conveying auger 6. The outlet end of the conveying auger 6 is connected to the inlet end of the reactor body 3. The outlet end of the reactor body 3 is connected to the inlet end of the silicon nitride powder block grinding mechanism 4. The outlet end of the silicon nitride powder block grinding mechanism 4 is connected to the inlet end of the specification screening mechanism 5.

[0043] The silicon block crushing ball milling mechanism 2 is equipped with a crushing particle screening plate 200 and a ball milling particle screening screen 2000.

[0044] The working principle and beneficial effects of the above technical solution are as follows: During operation, silicon blocks are fed into the silicon block crushing ball mill mechanism 2. The silicon block crushing ball mill mechanism 2 first crushes the silicon blocks to form broken silicon blocks. The broken silicon blocks are then screened by the crushing particle size screening plate 200, and the broken silicon blocks with actual particle size smaller than the mesh diameter of the crushing particle size screening plate 200 are screened out. Then, they are ball-milled to form silicon powder. The silicon powder with particle size smaller than the mesh size of the ball milling particle size screening mesh 2000 is screened out and sent to the conveying auger 6. The silicon powder with a 000 mesh is qualified silicon powder. The qualified silicon powder is transported to the reactor body 3 through the feeding auger 6. Then, the preparation gas is introduced into the reactor body 3 and the reactor body 3 is heated, so that a chemical reaction occurs in the reactor body 3 to generate Si3N4 powder blocks. After the reaction is completed, the Si3N4 powder blocks are poured into the silicon nitride powder block ball milling mechanism 4 for ball milling to form Si3N4 fine powder. Then, the Si3N4 fine powder is poured into the specification screening mechanism 5 for specification screening, and the Si3N4 fine powder of different specifications is classified and packaged.

[0045] First, the silicon block is crushed to a preset particle size, and then it is ball-milled. Adding a crushing step before ball milling greatly shortens the ball milling time. At the same time, a ball mill particle size screening screen 2000 is set to screen the silicon powder particle size, ensuring that the silicon powder particles automatically fall into the feeding auger 6 when they reach the preset particle size. The design of the specification screening mechanism 5 can perform specification screening of Si3N4 fine powder and classify and package Si3N4 fine powder of different specifications, thereby improving the factory quality of silicon nitride powder.

[0046] Example 2

[0047] Based on Embodiment 1, the silicon block crushing ball mill mechanism 2 includes an anti-blocking cylinder 2001, which is fixedly connected to the crushing ball mill mechanism housing 2002 of the silicon block crushing ball mill mechanism 2. A silicon block feeding funnel 2003 is fixedly connected to the anti-blocking cylinder 2001. An anti-blocking distributing roller 2004 is rotatably connected inside the anti-blocking cylinder 2001. A crushing particle screening plate 200 is slidably connected to the crushing ball mill mechanism housing 2002. The crushing particle screening plate 200 divides the interior of the crushing ball mill mechanism housing 2002 into a crushing chamber 2005 and a ball milling chamber 2006. A crushing component is provided in the crushing chamber 2005, and a ball milling component is provided in the ball milling chamber 2006. An electric sector tooth 2007 is rotatably connected to the crushing ball mill mechanism housing 2002. The electric sector tooth 2007 is used to mesh with the crushing particle screening plate 2000.

[0048] The anti-clogging material distribution roller 2004 includes an electric material distribution roller shaft 2008 and several material distribution blades 2009 fixedly connected to the electric material distribution roller shaft 2008. The material distribution blades 2009 have a V-shaped cross section.

[0049] The crushing assembly includes an electric crushing roller 201, which is rotatably connected to the crushing chamber 2005. Two symmetrically arranged electric turntables 2010 are rotatably connected to the front and rear sides of the crushing chamber 2005. A push rod 2011 is hinged to the electric turntable 2010. A chaff block 2012 is hinged to the end of the push rod 2011 away from the electric turntable 2010. The chaff block 2012 is slidably connected to the crushing ball mill housing 2002 and is used to cooperate with the electric crushing roller 201.

[0050] The ball mill assembly includes a drive roller 2013 and several roller shafts 2014 rotatably connected within the ball mill chamber 2006. The drive roller 2013 is coaxial with an electric sector gear 2007. An actuating roller 2015 and a roller 2016 are fixedly connected to the roller shafts 2014. An intermediate roller 2018 is fixedly connected to the leftmost roller shaft 2014. The intermediate roller 2018 is connected to the drive roller 2015. 013 is connected by a first transmission belt 2017, and several rolling rollers 2015 are connected by a second transmission belt 2019. Two symmetrically arranged guide plates 202 are provided on the inner wall of the ball mill chamber 2006 and below the rolling roller 2016. A silicon block ball mill 2020 is rotatably connected below the guide plates 202. A ball mill particle screening screen 2000 is set on the silicon block ball mill 2020. The bottom surface of the crushing ball mill mechanism housing 2002 is an inclined surface.

[0051] Preferably, the silicon block ball mill 2020 is slidably connected to a silicon block feed electric gate 2021.

[0052] The working principle and beneficial effects of the above technical solution are as follows: During operation, silicon blocks are fed into the silicon block feeding funnel 2003. Then, the electric distributing roller shaft 2008 rotates, which drives the distributing blades 2009 to rotate. The distributing blades 2009 divide the fed silicon blocks into several portions and feed them sequentially into the crushing chamber 2005. The design of the distributing blades 2009 avoids the blockage of the feed inlet of the crushing ball mill housing 2002 when the silicon blocks are fed in too quickly. The silicon blocks entering the crushing chamber 2005 are crushed and broken into silicon fragments by the cooperation of the electric crushing roller 201 and the guillotine block 2012. When the electric crushing roller 201 and the guillotine block 2012 work together, the electric crushing roller 201 rotates, and at the same time, the electric turntable 2010 rotates, driving the push rod 2011 to move. The movement of the connecting rod 2011 causes the chaff block 2012 to slide, thus intermittently approaching and moving away from the electric crushing roller 201. When the chaff block 2012 approaches the electric crushing roller 201, the silicon block located between them is crushed. The rotation of the electric crushing roller 201 prevents the silicon block from accumulating on the crushing particle size screening plate 200. When the silicon block is crushed to the point that its particle size is smaller than the mesh size of the crushing particle size screening plate 200, the crushed silicon block falls into the ball mill chamber 2006. In order to prevent the crushed silicon block from clogging the mesh of the crushing particle size screening plate 200, the electric sector tooth 2007 reciprocates during operation, causing the crushing particle size screening plate 200 to move back and forth. This not only prevents the crushed silicon block from clogging the mesh of the crushing particle size screening plate 200, but also accelerates the falling of crushed silicon blocks whose actual particle size is smaller than the mesh diameter of the crushing particle size screening plate 200.

[0053] The broken silicon pieces fall onto the rolling roller 2016. As the electric sector gear 2007 rotates, it drives the rolling pulley 2013 to rotate. The rolling pulley 2013 rotates, which in turn drives the first transmission belt 2017. The first transmission belt 2017 drives the intermediate pulley 2018 to rotate. The intermediate pulley 2018 rotates, which in turn drives the leftmost rolling shaft 2014 to rotate. The leftmost rolling shaft 2014 rotates, which in turn drives the executing rolling pulley 2015 to rotate. The executing rolling pulley 2015 rotates, which in turn drives the second transmission belt 2019 to rotate. The second transmission belt 2019 rotates, which in turn drives the remaining executing rolling pulleys 2015 to rotate, thereby driving their corresponding rolling shafts 2014 to rotate. The rotation of the rolling shafts 2014 drives the rolling roller 2016 to rotate. The broken silicon pieces falling onto the rolling roller 2016 are then... Under the action of 6, the silicon blocks are crushed into smaller fragments and fall into the silicon block ball mill 2020. At this time, the silicon block feed switch 2021 is in the open state. After the silicon block is fed, the silicon block feed switch 2021 is closed, and then the silicon block ball mill 2020 performs ball milling. During ball milling, the rotation of the silicon block ball mill 2020 drives the steel balls and silicon blocks inside to rotate together. The rotation of the silicon block ball mill 2020 makes the steel balls fit tightly against the silicon blocks. At the same time, when the steel balls are at the highest point, they fall heavily onto the silicon blocks. Through mutual squeezing and collision, the silicon blocks are finally ground into powder to form silicon powder. When the particle size of the silicon powder is smaller than the mesh size of the ball mill particle size screening screen 2000, it falls from the mesh size of the ball mill particle size screening screen 2000 to the bottom surface of the crushing ball mill housing 2002, and falls into the conveying auger 6 under the action of the inclined plane.

[0054] Example 3

[0055] Based on Embodiment 1, the conveying auger 6 includes an auger housing 600, an auger body 6000 rotatably connected inside the auger housing 600, a first guide rod 6001 fixedly connected inside the outlet end of the auger housing 600, a first conical plug 6002 slidably connected to the first guide rod 6001, a T-shaped feed pipe 6003 slidably connected to the reactor body 3, an L-shaped push rod 6004 fixedly connected to the inner wall of the T-shaped feed pipe 6003, a first electromagnet 6005 fixedly connected to the inner wall of the reactor body 3, a second electromagnet 6006 fixedly connected to the T-shaped feed pipe 6003, the first electromagnet 6005 and the second electromagnet 6006 being connected by a reset elastic member 6007, a connecting rod 6008 fixedly connected to the first electromagnet 6005, and a second conical plug 6009 fixedly connected to the end of the connecting rod 6008 away from the first electromagnet 6005.

[0056] The working principle and beneficial effects of the above technical solution are as follows: During operation, the auger body 6000 rotates, causing the silicon powder falling into the auger housing 600 to move upward and be extruded through the outlet end of the auger housing 600. Before extrusion, the first electromagnet 6005 and the second electromagnet 6006 are energized, thereby causing the T-shaped feed tube 6003 to move upward under the action of electromagnetic force until it extends into the interior of the outlet end of the auger housing 600. At this time, a gap is generated between the second conical plug 6009 and the T-shaped feed tube 6003. During the upward movement of the T-shaped feed tube 6003, the L-shaped push rod 6004 pushes the first conical plug 6002 to move upward along the first guide rod 6001, creating a gap between it and the inner wall of the auger housing 600. The silicon powder in the auger housing 600 falls into the T-shaped feed tube 6003 through the gap between the first conical plug 6002 and the inner wall of the auger housing 600, and then through the second... The gap between the conical plug 6009 and the T-shaped feed pipe 6003 falls into the reactor body 3. After the silicon powder is fed, the first electromagnet 6005 and the second electromagnet 6006 are de-energized, and the T-shaped feed pipe 6003 is reset under the action of the reset elastic element 6007. At this time, the gap between the second conical plug 6009 and the T-shaped feed pipe 6003 disappears, and the gap between the first conical plug 6002 and the inner wall of the auger shell 600 disappears. The reactor body 3 is in a sealed state. The design of the T-shaped feed pipe 6003 can meet the sealing adjustment of the reactor body 3 and the feeding requirements of the reactor body 3. Compared with the conventional design of directly adding a cover to the reactor body 3, which requires manual removal of the cover when feeding and sealing of the cover on the reactor body 3 during reaction, the design of the T-shaped feed pipe 6003 is more intelligent and safer.

[0057] Example 4

[0058] Based on Embodiment 1, a driving assembly is provided inside the base 1. This driving assembly drives the silicon nitride powder block ball milling mechanism 4 and the specification screening mechanism 5, and simultaneously drives the reactor body 3 to rotate. The driving assembly includes a linear motor 7, which is fixedly connected inside the base 1. A connecting plate 700 is fixedly connected to the output end of the linear motor. A drive motor 7000 is fixedly connected to the connecting plate 700. The motor 7000 has a first output shaft 7001 and a second output shaft 7002, which are rotatably connected inside the base 1. A first variable diameter shaft 7004 is rotatably connected inside the base 1. A first bevel gear 7003 and a first rotary gear 7005 are fixedly connected to the first variable diameter shaft 7004. A first shaft 7006 is rotatably connected inside the base 1. A second rotary gear 7007 and a third rotary gear 7008 are fixedly connected to both ends of the first shaft 7006, respectively. A first rotary gear ring 7009 is fixedly connected to the reactor body 3. The second rotary gear 7007 is used to mesh with the first rotary gear 7005, and the first rotary gear ring 7009 is used to mesh with the third rotary gear 7008.

[0059] The working principle and beneficial effects of the above technical solution are as follows: During operation, the linear motor 7 drives the connecting plate 700 to move upward, the connecting plate 700 moves upward, the motor 7000 moves upward, and the motor 7001 moves upward, thereby causing the first output shaft 7001 to extend into the first variable diameter rotating shaft 7004 and mesh with it. At this time, the first rotating gear 7005 and the second rotating gear 7007 mesh with each other. The motor 7000 starts and drives the first output shaft 7001 to rotate. The rotation of the first output shaft 7001 drives the first rotating gear 7005 to rotate. The rotation of the first rotating gear 7005 drives the second rotating gear 7007 to rotate. The rotation of the second rotating gear 7007 drives the first rotating shaft 7006 to rotate. The rotation of the first rotating shaft 7006 drives the third rotating gear 7008 to rotate. The rotation of the third rotating gear 7008 drives the first rotating gear ring 7009 to rotate. The rotation of the first rotating gear ring 7009 drives the reactor body 3 to rotate, thereby accelerating the synthesis reaction of silicon nitride.

[0060] Example 5

[0061] Based on Embodiment 1, a second variable diameter shaft 701 and a second shaft 7011 are rotatably connected inside the base 1. The second variable diameter shaft 701 is used to mesh with the second output shaft 7002. A second bevel gear 7010 is fixedly connected to the second variable diameter shaft 701. A third bevel gear 7012 and a ball milling mechanism meshing gear 7013 are fixedly connected to the second shaft 7011. A second rotating meshing gear ring 7014 is fixedly connected to the silicon nitride powder block ball milling mechanism 4. The ball milling mechanism meshing gear 7013 and the second rotating meshing gear ring 7014 mesh with each other.

[0062] Preferably, the silicon nitride powder ball milling mechanism 4 is located directly below the reactor body 3. The silicon nitride powder ball milling mechanism 4 includes a silicon nitride powder feeding electric gate 400 and a silicon nitride powder ball milling mechanism cylinder 401. The silicon nitride powder feeding electric gate 400 is slidably connected inside the silicon nitride powder ball milling mechanism cylinder 401. A silicon nitride powder screen 402 is provided at the outlet end of the silicon nitride powder ball milling mechanism cylinder 401.

[0063] The working principle and beneficial effects of the above technical solution are as follows: During operation, the linear motor 7 drives the connecting plate 700 to move downwards. The downward movement of the connecting plate 700 drives the motor 7000 to move downwards. The downward movement of the motor 7000 drives the first output shaft 7001 to move downwards, thereby causing the first output shaft 7001 to extend into and mesh with the second variable diameter rotating shaft 701. Then, the rotation of the motor 7000 drives the second rotating shaft 7011 to rotate. The rotation of the second rotating shaft 7011 drives the second variable diameter rotating shaft 701 to rotate. The rotation of the second variable diameter rotating shaft 701 drives the second bevel gear 7010 to rotate. The rotation of the second bevel gear 7010 drives the rotation of the third bevel gear 7012, which in turn drives the rotation of the ball mill mechanism meshing gear 7013. The rotation of the ball mill mechanism meshing gear 7013 drives the rotation of the second rotating meshing gear ring 7014, which in turn drives the rotation of the silicon nitride powder block ball mill mechanism cylinder 401. Thus, the silicon nitride powder blocks are ground by the steel balls inside the silicon nitride powder block ball mill mechanism cylinder 401. When the silicon nitride powder blocks inside the silicon nitride powder block ball mill mechanism cylinder 401 are ground to the required degree, they are output from the silicon nitride powder screen 402 to the specification screening mechanism 5.

[0064] Example 6

[0065] Based on Embodiment 5, the specification screening mechanism 5 includes a specification screening mechanism housing 500, within which a powder stirring paddle 5000 is provided. The outlet end of the silicon nitride powder block ball milling mechanism 4 is located within the specification screening mechanism housing 500. A first gear 5001 is fixedly connected to the powder stirring paddle 5000. A third rotating shaft 5002 is rotatably connected within the base 1. A second gear 5003 and a third gear 5004 are fixedly connected to the third rotating shaft 5002. A second variable diameter rotating shaft 701 is fixedly connected to... A fourth gear 5005 is fixedly connected. The first gear 5001 is used to mesh with the second gear 5003, and the third gear 5004 is used to mesh with the fourth gear 5005. A negative pressure chamber 5006 is provided inside the housing 500 of the specification screening mechanism. A negative pressure channel 5007 is provided on the negative pressure chamber 5006. A baffle 5008 is provided at the negative pressure channel 5007. A negative pressure generating component is provided at the end of the negative pressure channel 5007 away from the baffle 5008. A powder outlet 5009 is provided at the bottom of the negative pressure chamber 5006.

[0066] The negative pressure generating component includes a fourth rotating shaft 501 and a fifth rotating shaft 5010. The fourth rotating shaft 501 and the fifth rotating shaft 5010 are rotatably connected in the base 1 and their axes are perpendicular to each other. A fourth bevel gear 5011 and a fifth bevel gear 5012 are fixedly connected to the fourth rotating shaft 501, and a sixth bevel gear 5013 and a negative pressure fan 5014 are fixedly connected to the fifth rotating shaft 5010. The fourth bevel gear 5011 is used to mesh with the first bevel gear 7003, and the fifth bevel gear 5012 is used to mesh with the sixth bevel gear 5013.

[0067] The working principle and beneficial effects of the above technical solution are as follows: During operation, the motor 7000 drives the first output shaft 7001 to rotate, the first output shaft 7001 drives the first variable diameter shaft 7004 to rotate, the first variable diameter shaft 7004 drives the first bevel gear 7003 to rotate, the first bevel gear 7003 drives the fourth bevel gear 5011 to rotate, the fourth bevel gear 5011 drives the fourth shaft 501 to rotate, the fourth shaft 501 drives the fifth bevel gear 5012 to rotate, the fifth bevel gear 5012 drives the sixth bevel gear 5013 to rotate, which in turn drives the fifth shaft 5010 to rotate, thereby driving the negative... When the pressure fan 5014 rotates, the air pressure inside the negative pressure chamber 5006 decreases. The silicon nitride powder inside the housing 500 of the specification screening mechanism is forced into the negative pressure chamber 5006 under the stirring of the powder stirring paddle 5000 and the action of negative pressure. Due to the action of the baffle 5008, the silicon nitride powder cannot enter the negative pressure channel 5007 and accumulates in the negative pressure chamber 5006. When the negative pressure fan 5014 stops rotating, the silicon nitride powder falls into the powder outlet 5009 under the action of gravity. The silicon nitride powder can be collected simply by placing a packaging bag at the powder outlet 5009.

[0068] By adjusting the speed of the negative pressure fan 5014, the negative pressure in the negative pressure chamber 5006 can be adjusted, thereby playing a role in screening silicon nitride powder. That is, a certain pressure can only force silicon nitride powder with a certain particle size into the negative pressure chamber 5006. By adjusting the pressure value, the particle size of silicon nitride powder can be screened.

[0069] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A reactor for synthesizing silicon nitride powder, characterized in that: Includes a base (1), on which are provided a silicon block crushing ball milling mechanism (2), a reactor body (3), a silicon nitride powder ball milling mechanism (4) and a specification screening mechanism (5). The outlet end of the silicon block crushing ball milling mechanism (2) is connected to the inlet end of the conveying auger (6). The outlet end of the conveying auger (6) is used to connect to the inlet end of the reactor body (3). The outlet end of the reactor body (3) is connected to the inlet end of the silicon nitride powder ball milling mechanism (4). The outlet end of the silicon nitride powder ball milling mechanism (4) is connected to the inlet end of the specification screening mechanism (5). The silicon block crushing ball milling mechanism (2) is equipped with a crushing particle screening plate (200) and a ball milling particle screening screen (2000); the silicon block crushing ball milling mechanism (2) includes an anti-blocking cylinder (2001), which is fixedly connected to the crushing ball milling mechanism housing (2002) of the silicon block crushing ball milling mechanism (2), and a silicon block feeding funnel (2003) is fixedly connected to the anti-blocking cylinder (2001). An anti-blocking distributing roller (2004) is rotatably connected inside the anti-blocking cylinder (2001). The crushing particle screening plate (200) is slidably connected to the crushing ball milling mechanism housing (2002) from left to right. The crushing particle screening plate (200) divides the inside of the crushing ball milling mechanism housing (2002) into a crushing chamber (2005) and a ball milling chamber (2006). The crushing chamber (2005) is equipped with a crushing component, and the ball milling chamber (2006) is equipped with a crushing component. 6) The internal structure is equipped with a ball mill assembly. An electric sector tooth (2007) is rotatably connected to the crushing ball mill housing (2002). The electric sector tooth (2007) is used to mesh with the crushing particle screening plate (200). The crushing assembly includes an electric crushing roller (201). The electric crushing roller (201) is rotatably connected to the crushing chamber (2005). Two symmetrically arranged electric turntables (2010) are rotatably connected to the front and rear sides of the crushing chamber (2005). A push rod (2011) is hinged to the electric turntable (2010). A guillotine block (2012) is hinged to the end of the push rod (2011) away from the electric turntable (2010). The guillotine block (2012) is slidably connected to the crushing ball mill housing (2002). The guillotine block (2012) is used to cooperate with the electric crushing roller (201).

2. The reactor for synthesizing silicon nitride powder according to claim 1, characterized in that: The anti-clogging distribution roller (2004) includes an electric distribution roller shaft (2008) and several distribution blades (2009) fixedly connected to the electric distribution roller shaft (2008). The distribution blades (2009) have a V-shaped cross section.

3. The reactor for synthesizing silicon nitride powder according to claim 1, characterized in that: The ball mill assembly includes a drive roller (2013) and several roller shafts (2014) rotatably connected within the ball mill chamber (2006). The drive roller (2013) is coaxial with an electric sector gear (2007). An actuating roller (2015) and a roller (2016) are fixedly connected to the roller shafts (2014). An intermediate roller (2018) is fixedly connected to the leftmost roller shaft (2014). The intermediate roller (2018) and the drive roller (2016) are connected to each other. 013) A number of rolling rollers (2015) are connected by a first transmission belt (2017) and a second transmission belt (2019). Two symmetrically arranged guide plates (202) are provided on the inner wall of the ball mill cavity (2006) and below the rolling roller (2016). A silicon block ball mill (2020) is rotatably connected below the guide plates (202). A ball mill particle screening screen (2000) is set on the silicon block ball mill (2020). The bottom surface of the crushing ball mill housing (2002) is an inclined surface.

4. The reactor for synthesizing silicon nitride powder according to claim 1, characterized in that: The conveying auger (6) includes an auger shell (600), an auger body (6000) rotatably connected inside the auger shell (600), a first guide rod (6001) fixedly connected inside the outlet end of the auger shell (600), a first conical plug (6002) slidably connected to the first guide rod (6001), a T-shaped feed pipe (6003) slidably connected to the reactor body (3), and an L-shaped push rod (6004) fixedly connected to the inner wall of the T-shaped feed pipe (6003). A first electromagnet (6005) is fixedly connected to the inner wall of the main body (3) of the apparatus, and a second electromagnet (6006) is fixedly connected to the T-shaped feed tube (6003). The first electromagnet (6005) and the second electromagnet (6006) are connected by a reset elastic element (6007). A connecting rod (6008) is fixedly connected to the first electromagnet (6005), and a second conical plug (6009) is fixedly connected to the end of the connecting rod (6008) away from the first electromagnet (6005).

5. The reactor for synthesizing silicon nitride powder according to claim 1, characterized in that: The base (1) is equipped with a drive assembly, which is used to drive the silicon nitride powder block ball milling mechanism (4) and the specification screening mechanism (5) to work, and at the same time drive the reactor body (3) to rotate. The drive assembly includes a linear motor (7), which is fixedly connected in the base (1). The output end of the linear motor is fixedly connected to a connecting plate (700), and a drive motor (7000) is fixedly connected on the connecting plate (700). The motor (7000) is equipped with a first output shaft (7001) and a second output shaft (7002). The first output shaft (7001) and the second output shaft (7002) are rotatably connected in the base (1). A first variable diameter rotating shaft (7004) is rotatably connected in the base (1). The first variable diameter shaft (7004) is used to mesh with the first output shaft (7001). The first variable diameter shaft (7004) is fixedly connected to the first bevel gear (7003) and the first rotary gear (7005). The first shaft (7006) is rotatably connected inside the base (1). The two ends of the first shaft (7006) are fixedly connected to the second rotary gear (7007) and the third rotary gear (7008). The reactor body (3) is fixedly connected to the first rotary gear (7009). The second rotary gear (7007) is used to mesh with the first rotary gear (7005), and the first rotary gear (7009) is used to mesh with the third rotary gear (7008).

6. The reactor for synthesizing silicon nitride powder according to claim 1, characterized in that: The reactor body (3) is equipped with a stirring paddle (8).

7. The reactor for synthesizing silicon nitride powder according to claim 6, characterized in that: The base (1) is rotatably connected to a second variable diameter shaft (701) and a second shaft (7011). The second variable diameter shaft (701) is used to mesh with the second output shaft (7002). A second bevel gear (7010) is fixedly connected to the second variable diameter shaft (701). A third bevel gear (7012) and a ball milling mechanism meshing gear (7013) are fixedly connected to the second shaft (7011). A second rotating meshing gear ring (7014) is fixedly connected to the silicon nitride powder block ball milling mechanism cylinder (4). The ball milling mechanism meshing gear (7013) meshes with the second rotating meshing gear ring (7014).

8. The reactor for synthesizing silicon nitride powder according to claim 7, characterized in that: The specification screening mechanism (5) includes a specification screening mechanism housing (500), a powder stirring paddle (5000) is provided inside the specification screening mechanism housing (500), the outlet end of the silicon nitride powder block ball milling mechanism (4) is located inside the specification screening mechanism housing (500), a first gear (5001) is fixedly connected to the powder stirring paddle (5000), a third rotating shaft (5002) is rotatably connected inside the base (1), a second gear (5003) and a third gear (5004) are fixedly connected to the third rotating shaft (5002), and a fourth gear is fixedly connected to the second variable diameter rotating shaft (701). Gear (5005), first gear (5001) is used to mesh with second gear (5003), third gear (5004) is used to mesh with fourth gear (5005), the housing (500) of the specification screening mechanism is provided with a negative pressure chamber (5006), a negative pressure channel (5007) is provided on the negative pressure chamber (5006), a baffle (5008) is provided at the negative pressure channel (5007), a negative pressure generating component is provided at the end of the negative pressure channel (5007) away from the baffle (5008), and a powder outlet (5009) is provided at the bottom of the negative pressure chamber (5006).

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