Device for preparing a powder of silicon nitride ceramic

Abstract

This utility model relates to the field of ceramic preparation technology, and more particularly to a powder preparation device for silicon nitride ceramics. It includes a shell, with fixed rods fixedly connected to both sides of the inner wall of the shell. An inner cylinder is fixedly connected to the end of each fixed rod away from the shell. A crusher body is installed inside the inner cylinder, and a powder scraping and pushing mechanism is installed at the bottom of the crusher body. A sieving mechanism for screening powder is provided at the bottom of the inner wall of the inner cylinder. A groove is provided at the bottom of the inner wall of the shell, and a collection box is slidably connected to the groove. A manual grinding component for secondary grinding of the powder is installed inside the collection box. This utility model, through the cooperation of the powder scraping and pushing mechanism and the sieving mechanism, can intercept undispersed agglomerated powder on the sieving plate, preventing it from falling directly into the collection box. This ensures that the powder entering the collection box initially meets the particle size requirements. Furthermore, the manual grinding component inside the collection box further improves the fineness and uniformity of the powder.

Description

Technical Field

[0001] This utility model relates to the field of ceramic preparation technology, and in particular to a powder preparation device for silicon nitride ceramics. Background Technology

[0002] In the field of new energy, high-performance silicon nitride structural ceramics are widely used in the manufacture of key components such as new energy vehicle motors, photovoltaic inverters, and energy storage devices due to their excellent high-temperature resistance, high strength, high insulation, and good chemical stability. The performance of these high-performance ceramics largely depends on the quality of their raw material powder, which requires the powder to have uniform particle size distribution, no agglomeration, and high purity.

[0003] Existing ceramic powder preparation devices, such as the silicon nitride ceramic powder preparation device disclosed in CN214811578U, use a rotary motor to drive the crushing blades to rotate, performing the initial crushing of the raw materials in the inner cylinder. Then, two second rotary motors drive two grinding rollers to rotate, grinding the scattered raw materials after crushing. This avoids the problem of difficulty in grinding during the powder preparation process. However, the above-mentioned powder preparation device does not have a screening device. The agglomerated powder can easily fall directly into the collection box and cannot fully contact the grinding rollers, which greatly reduces the grinding effect. The agglomerated powder will affect subsequent molding, sintering and other processes, and ultimately reduce the performance of high-performance silicon nitride ceramics. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing powder preparation devices, which do not include a sieving device. As a result, clumped powder easily falls directly into the collection box and cannot fully contact the grinding roller, leading to a significant reduction in grinding efficiency. Clumped powder also affects subsequent molding and sintering processes, ultimately reducing the performance of high-performance silicon nitride ceramics. Therefore, this invention proposes a powder preparation device for silicon nitride ceramics.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A silicon nitride ceramic powder preparation device includes an outer shell, with fixed rods fixedly connected to both sides of the inner wall of the outer shell, and an inner cylinder fixedly connected to the end of the fixed rods away from the outer shell. A crusher body is arranged inside the inner cylinder, and a powder scraping and pushing mechanism is arranged at the bottom of the crusher body. A sieving mechanism for screening powder is opened at the bottom of the inner wall of the inner cylinder. A sliding groove is opened at the bottom of the inner wall of the outer shell, and a collection box is slidably connected to the sliding groove. A manual grinding component for secondary grinding of powder is arranged inside the collection box.

[0007] Preferably, the powder scraping and pushing mechanism includes a scraping plate fixedly connected to the outer wall of the drive shaft of the crusher body, and the bottom of the scraping plate is provided with uniformly distributed scraping bristles.

[0008] Preferably, the screening mechanism includes an installation groove at the bottom of the inner cylinder, a screening plate is provided in the installation groove, an insert block is fixedly connected to one end of the screening plate, and fixing blocks are fixedly connected to both sides of the outer wall of the other side of the screening plate, and cross bolts are threaded onto the fixing blocks.

[0009] Preferably, one end of the mounting groove has a slot adapted to the insert block on its inner wall, the insert block and the slot are slidably engaged, and the other end of the mounting groove has a pair of adapter slots, the fixing block and the adapter slots are interlocked and fastened together by cross bolts.

[0010] Preferably, the manual grinding assembly includes openings on both sides of the outer wall of the housing, a movable rod is movably connected in the opening, a grinding roller is sleeved on the movable rod, and limiting plates are sleeved at both ends of the movable rod.

[0011] Preferably, the grinding roller rolls and crushes the powder in the collection box, and a limiting groove is provided on the outer wall of the movable rod. The movable rod slides with the grinding roller through the limiting groove, so that the grinding roller rolls back and forth in the opening following the movable rod.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] 1. In use, this utility model, through the cooperation of the powder scraping and pushing mechanism and the screening mechanism, can strictly control the powder before it falls from the inner cylinder into the collection box. When the crusher body is working, the drive shaft drives the scraper plate to rotate. The scraper bristles at the bottom of the scraper plate can scrape the crushed powder, further dispersing any powder that may clump. At the same time, in conjunction with the screening plate at the bottom of the inner cylinder, it can intercept any undispersed clumps of powder on the screening plate, preventing them from falling directly into the collection box. This ensures that the powder entering the collection box initially meets the particle size requirements, laying a good foundation for subsequent processing.

[0014] 2. In use, this utility model allows for secondary grinding of the powder entering the collection box via a manual grinding component. By pushing the movable rod, the grinding roller rolls back and forth within the collection box, effectively removing any small lumps that may be present in the powder, further improving its fineness and uniformity. This ensures the smooth progress of subsequent molding, sintering, and other processes, and is beneficial for improving the performance of high-performance silicon nitride ceramics. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural schematic diagram of a silicon nitride ceramic powder preparation device proposed in this utility model;

[0016] Figure 2 This is a schematic diagram of the internal three-dimensional structure of a silicon nitride ceramic powder preparation device proposed in this utility model;

[0017] Figure 3 This is a schematic diagram of the internal three-dimensional structure of the inner cylinder of the silicon nitride ceramic powder preparation device proposed in this utility model.

[0018] Figure 4 This is a three-dimensional structural diagram of the sieve plate of a silicon nitride ceramic powder preparation device proposed in this utility model.

[0019] In the diagram: 1. Outer shell; 2. Fixing rod; 3. Inner cylinder; 4. Crusher body; 5. Powder scraping and pushing mechanism; 6. Screening mechanism; 7. Slide chute; 8. Collection box; 9. Manual grinding assembly; 10. Scraper plate; 11. Scraper; 12. Mounting groove; 13. Screening plate; 14. Insert block; 15. Fixing block; 16. Cross bolt; 17. Through port; 18. Movable rod; 19. Grinding roller; 20. Limiting plate. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0021] Reference Figures 1-4 A silicon nitride ceramic powder preparation device includes an outer shell 1. Fixed rods 2 are fixedly connected to both sides of the inner wall of the outer shell 1. An inner cylinder 3 is fixedly connected to the end of the fixed rods 2 away from the outer shell 1. A crusher body 4 is arranged inside the inner cylinder 3. The crusher body 4 is a prior art used in the field of this technology. The transmission rod and crushing blade are driven to rotate at high speed by a rotating motor at the top of the outer shell 1 to crush the raw materials into powder, so it will not be described in detail.

[0022] The bottom of the crusher body 4 is provided with a powder scraping and pushing mechanism 5. The powder scraping and pushing mechanism 5 includes a scraping plate 10 fixedly connected to the outer wall of the drive shaft of the crusher body 4. The scraping plate 10 is located at the bottom of the outer wall of the drive shaft. The bottom of the scraping plate 10 is provided with uniformly distributed scraping bristles 11. The scraping bristles 11 are made of polyurethane rubber, which is soft and wear-resistant.

[0023] The powder scraping and pushing mechanism 5 can, on the one hand, break up the clumps of powder and make it into fine powder that meets the requirements; on the other hand, it can push the powder to move towards the screening plate 13 to facilitate subsequent screening.

[0024] A screening mechanism 6 for screening powder is provided at the bottom of the inner wall of the inner cylinder 3. The mounting groove 12 in the screening mechanism 6 is located at the bottom of the inner cylinder 3. Its size and shape match the screening plate 13, providing a precise installation position for the screening plate 13. The screening plate 13 is made of high-strength metal mesh or porous plate. The mesh or aperture size is designed according to the particle size requirements of the powder, which can effectively intercept undispersed agglomerated powder. The insertion block 14 at one end of the screening plate 13 slides into the slot on the inner wall of the mounting groove 12. This design allows the screening plate 13 to be quickly positioned during installation and is also easy to disassemble.

[0025] A groove 7 is provided at the bottom of the inner wall of the outer casing 1. A collection box 8 is slidably connected to the groove 7. A manual grinding component 9 for secondary grinding of the powder is provided inside the collection box 8. The openings 17 in the manual grinding component 9 are located on both sides of the outer wall of the outer casing 1. Their positions and dimensions are precisely calculated to ensure that the movable rod 18 can move flexibly within the openings 17. The movable rod 18 is made of high-strength metal rod, and the limiting plates 20 sleeved at both ends can prevent the movable rod 18 from falling out of the openings 17 during movement, ensuring operational safety. The grinding roller 19 sleeved on the movable rod 18 is made of wear-resistant material. Its surface is smooth and has a certain weight, which can generate sufficient pressure on the powder in the collection box 8.

[0026] The fixing blocks 15 on both sides of the outer wall of the other side of the screening plate 13 are interlocked with the adapter groove at the other end of the mounting groove 12 and are fastened by the cross bolts 16, which ensures the stability of the screening plate 13 during operation and prevents it from loosening due to vibration. The setting of the cross bolts 16 makes the disassembly and assembly of the screening plate 13 simple and convenient, and facilitates the cleaning, maintenance or replacement of the screening plate 13 with screening plates 13 of different apertures to meet different powder requirements.

[0027] The limiting groove on the outer wall of the movable rod 18 slides with the grinding roller 19, allowing the grinding roller 19 to roll back and forth in the opening 17 following the movable rod 18, and also to rotate freely within a certain range, ensuring that the grinding roller 19 can evenly crush and grind the powder in the collection box 8, effectively removing any small lumps that may exist in the powder.

[0028] Working principle:

[0029] First, the raw material is fed into the crusher body 4 inside the inner cylinder 3. The rotary motor is started, driving the transmission rod and crushing blades to rotate at high speed, crushing the raw material into powder. During the crushing process, the scraper plate 10 of the powder scraping and pushing mechanism 5 rotates with the transmission shaft, using the polyurethane scraper 11 at the bottom to break up the clumps of powder and push them towards the screening plate 13. When the powder passes through the screening mechanism 6, the fine powder that meets the particle size requirements falls into the collection box 8 through the mesh of the screening plate 13, while the uncrushed clumps are intercepted and remain in the inner cylinder 3 to continue crushing, ensuring the uniformity of the powder.

[0030] The fine powder in collection box 8 undergoes secondary grinding via manual grinding assembly 9: the operator horizontally pushes movable rod 18, causing grinding roller 19 to reciprocate within collection box 8, further crushing residual micro-clumps using its own weight and surface pressure. Limiting plate 20 prevents movable rod 18 from dislodging, while the limiting groove design ensures that grinding roller 19 rotates synchronously during rolling, improving grinding uniformity. After secondary grinding, collection box 8 can be removed to obtain high-fineness silicon nitride ceramic powder. Screening plate 13 can be quickly replaced by removing cross bolts 16 to accommodate different particle size requirements.

[0031] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A silicon nitride ceramic powder preparation apparatus, comprising a shell (1), characterized in that, Fixed rods (2) are fixedly connected to both sides of the inner wall of the outer shell (1). An inner cylinder (3) is fixedly connected to one end of the fixed rod (2) away from the outer shell (1). A crusher body (4) is provided inside the inner cylinder (3). A powder scraping and pushing mechanism (5) is provided at the bottom of the crusher body (4). A screening mechanism (6) for screening powder is provided at the bottom of the inner wall of the inner cylinder (3). A sliding groove (7) is provided at the bottom of the inner wall of the outer shell (1). A collection box (8) is slidably connected to the sliding groove (7). A manual grinding component (9) for secondary grinding of powder is provided inside the collection box (8).

2. The apparatus for preparing silicon nitride ceramic powder according to claim 1, characterized in that, The powder scraping and pushing mechanism (5) includes a scraping plate (10) fixedly connected to the outer wall of the drive shaft of the crusher body (4), and the bottom of the scraping plate (10) is provided with uniformly distributed scraping bristles (11).

3. The apparatus for preparing silicon nitride ceramic powder according to claim 1, characterized in that, The screening mechanism (6) includes an installation groove (12) at the bottom of the inner cylinder (3), a screening plate (13) is provided in the installation groove (12), an insert block (14) is fixedly connected to one end of the screening plate (13), and a fixing block (15) is fixedly connected to both sides of the outer wall of the other side of the screening plate (13), and a cross bolt (16) is threaded onto the fixing block (15).

4. The apparatus for preparing silicon nitride ceramic powder according to claim 3, characterized in that, The inner wall of one end of the mounting groove (12) is provided with a slot that matches the insert (14). The insert (14) slides with the slot. The other end of the mounting groove (12) is provided with a pair of matching slots. The fixing block (15) and the matching slots are interlocked and fastened together by a cross bolt (16).

5. The silicon nitride ceramic powder preparation apparatus according to claim 1, characterized in that, The manual grinding assembly (9) includes openings (17) on both sides of the outer wall of the outer shell (1), a movable rod (18) is movably connected in the opening (17), a grinding roller (19) is sleeved on the movable rod (18), and a limiting plate (20) is sleeved at both ends of the movable rod (18).

6. The silicon nitride ceramic powder preparation apparatus according to claim 5, characterized in that, The grinding roller (19) rolls and crushes the powder in the collection box (8). The outer wall of the movable rod (18) has a limiting groove. The movable rod (18) slides with the grinding roller (19) through the limiting groove, so that the grinding roller (19) rolls back and forth in the opening (17) following the movable rod (18).

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