Silicon nitride powder mixing device
By employing a bidirectional rotating stirring component and a three-dimensional stirring flow field design in the silicon nitride powder mixing device, the problems of uneven mixing and low efficiency were solved, achieving efficient and uniform mixing of silicon nitride raw materials and improving product quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-30
- Publication Date
- 2026-04-10
AI Technical Summary
Existing mixers suffer from uneven mixing and low efficiency during the mixing of silicon nitride raw materials. In particular, for raw materials with large density differences, stratification is prone to occur, resulting in insufficient mixing and affecting the quality of silicon nitride products.
The mixing component adopts a bidirectional rotating design, combined with an internal toothed ring and toothed disc design, to form a three-dimensional mixing flow field. The design of the spiral mixing blades enables bidirectional shearing and convection of the raw materials. In conjunction with the tilting cylinder driving the mixing tank to reciprocate, the mixing uniformity is enhanced.
This method achieves efficient and uniform mixing of silicon nitride raw materials, shortens the mixing cycle, improves mixing efficiency, avoids material adhesion and stratification, and enhances product quality and yield.
Smart Images
Figure CN224100535U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the field of mixing equipment, concretely relates to a silicon nitride powder mixing device. BACKGROUND
[0002] As a high-performance ceramic material, silicon nitride has high strength, high hardness, high temperature resistance, corrosion resistance and excellent insulation performance, and has a wide range of application requirements in many high-end fields such as aerospace, electronic devices, mechanical manufacturing, metallurgy and chemical industry. The production and processing process of silicon nitride has very high requirements for the ratio of raw materials and the uniformity of mixing, and the mixing quality of the raw materials directly determines the stability of the subsequent sintering process, and then affects the density, mechanical properties and service life of the final silicon nitride product.
[0003] The raw materials required for the production of silicon nitride are mainly silicon powder, supplemented by a small amount of sintering aid. In the production process of silicon nitride, the mixing of raw materials before sintering is the core pretreatment process. Due to the differences in density, particle size, and physical and chemical properties of each raw material, if the mixing is not uniform, it will lead to local composition imbalance in the subsequent nitriding reaction process, resulting in unreacted silicon phase or excessive nitriding of impurity phase; at the same time, uneven mixing will cause pores, cracks, composition segregation and other defects in the internal of the product after sintering, greatly reducing the strength, hardness and high temperature stability of the product, and even causing the product to be scrapped, which cannot meet the use requirements of high-end fields. Therefore, efficient and uniform mixing of raw materials is the key prerequisite for improving the production quality and yield of silicon nitride.
[0004] At present, the commonly used raw material mixing method in the production and processing of silicon nitride is mechanical stirring method, that is, using a stirrer to mix the raw materials. The core structure of the existing stirrer usually includes a stirring barrel, a driving motor and stirring blades arranged in the stirring barrel. When working, the stirring blades are rotated in the stirring barrel by the driving motor, and the relative movement of the raw materials is caused by the pushing and stirring action of the stirring blades, so as to realize mixing.
[0005] However, the stirring blades of the existing stirrer usually adopt a single-direction rotating working mode, and the raw materials are easy to form a fixed circulating track in the stirring barrel during stirring. Some raw materials only move in the same direction with the circulating flow, and it is difficult to realize the cross-penetration and sufficient contact of each component of the raw materials, especially for raw materials with large density difference (such as silicon powder and sintering aid), which is easy to cause stratification, resulting in insufficient mixing uniformity; in addition, the single-direction rotating stirring mode has limited shearing and dispersion effect on the raw materials. In order to achieve the preset mixing effect, the stirring time needs to be prolonged, which reduces the production efficiency. UTILITY MODEL CONTENTS
[0006] The utility model aims at overcoming the deficiencies in the prior art, and provides a silicon nitride powder mixing device to optimize the mixing structure and working mode, realize efficient and uniform mixing of silicon nitride raw materials, and provide protection for the improvement of silicon nitride product quality.
[0007] To achieve the above object, the utility model adopts the technical scheme of:
[0008] A kind of silicon nitride powder mixing device, comprising:
[0009] Base, for supporting mixing barrel;
[0010] Mixing barrel, upper portion is equipped with several raw material bins, mixing barrel lower portion is equipped with discharge gate, the both sides of mixing barrel are installed on the base by fixed shaft;
[0011] Drive mechanism, for driving stirring mechanism to rotate, including motor and speed reducer installed on the upper portion of mixing barrel, the inside of mixing barrel is fixedly connected with transmission mechanism by multiple fixed supports, the upper end of transmission mechanism is equipped with first rotating shaft, the output shaft of speed reducer is connected with the upper end of first rotating shaft, the lower end of transmission mechanism is equipped with second rotating shaft, and the rotating direction of first rotating shaft and second rotating shaft is opposite;
[0012] Stirring mechanism, including upper disc and lower disc, the upper disc is fixedly connected with first rotating shaft, the lower disc is fixedly connected with second rotating shaft, the upper disc is evenly connected with several first connecting rods in circumference, first connecting rod end is rotatably connected with first stirring shaft, and first stirring assembly is equipped on the first stirring shaft;The lower disc is evenly connected with several second connecting rods in circumference, second connecting rod end is rotatably connected with second stirring shaft, and second stirring assembly is equipped on the second stirring shaft.
[0013] Further, the transmission mechanism includes transmission box, the upper portion of transmission box is rotatably connected with driving gear, the side wall of transmission box is rotatably connected with transition gear meshing with driving gear, the lower portion of transmission box is rotatably connected with driven gear meshing with transition gear, and the lower end of first rotating shaft is fixedly connected with driving gear, and the upper end of second rotating shaft is fixedly connected with driven gear.
[0014] Further, the inner tooth ring is fixedly connected on the inner wall of mixing barrel, the first stirring shaft is rotatably connected with first connecting rod, the upper end of first stirring shaft is fixedly connected with first gear, and the first gear is meshed with the inner tooth ring;The lower portion of transmission box is equipped with toothed disc, the second stirring shaft is rotatably connected with second connecting rod, the upper end of second stirring shaft is fixedly connected with second gear, and the second gear is meshed with the toothed disc.
[0015] Further, the first stirring assembly and second stirring assembly adopt spiral stirring blade.
[0016] Further, the first stirring assembly and second stirring assembly adopt stirring frame structure, the stirring frame is equipped with several shaft sleeves, and the first stirring shaft and second stirring shaft are detachably connected with the shaft sleeve through bolt.
[0017] Further, the first stirring assembly is provided with brushes on both sides, the two ends of the brushes are detachably connected with the first stirring assembly through bolts, when the first stirring assembly rotates to be close to the inner wall of the mixing barrel, the brushes are in contact with the inner wall of the mixing barrel, and the inner wall of the mixing barrel is cleaned in real time.
[0018] Further, the first rotating shaft is fixedly connected with a cloth distribution disc, the upper end surface of the cloth distribution disc is attached to the lower surface of the upper cover of the mixing barrel, a plurality of cloth distribution holes are arranged on the cloth distribution disc and correspond to the positions of the discharge ports of the raw material bins.
[0019] Further, the mixing barrel is suspended on the base, the fixed shaft is movably connected with the base through bearings, a turnover cylinder is pivoted to the base, and the piston rod end of the turnover cylinder is pivoted to the bottom of the mixing barrel.
[0020] The utility model discloses the beneficial effects are:
[0021] (1) the utility model discloses a mixing barrel is provided with two groups of first stirring assembly and second stirring assembly of opposite rotation direction in the inside, and the two-way shearing, convection and diffusion effect are formed to raw material, and the raw material particle agglomeration is effectively broken, the uniformity and fullness of raw material mixing are enhanced, and the mixing period is shortened, and the overall mixing efficiency is improved.
[0022] (2) through setting the internal gear ring on the inner wall of the mixing barrel and setting the toothed disc on the lower part of the transmission box, when the first stirring assembly and the second stirring assembly produce self-rotation while revolving, the three-dimensional stirring flow field is formed in the mixing barrel, the uniformity and fullness of raw material mixing are improved, the mixing period is shortened, and the overall mixing efficiency is further improved.
[0023] (3) when the first stirring assembly and the second stirring assembly adopt spiral stirring blades, in the process of self-rotation of the stirring assembly, the upward lifting force is formed to the silicon nitride raw material by the helical angle characteristics of the spiral blades, the material in the mixing barrel is driven to flow and migrate from bottom to top, and then the material up-down circulation convection motion state is formed in the barrel, so that the material layering is avoided, and the mixing uniformity of the silicon nitride raw material is further strengthened.
[0024] (4) the first stirring assembly and the second stirring assembly adopt the stirring frame structure, and the stirring frame is detachably connected with the first stirring shaft and the second stirring shaft, when the stirring assembly is worn, damaged or needs to be replaced with different specifications stirring frame according to the characteristics of the silicon nitride raw material, the operator does not need to disassemble the equipment main body greatly, and can only loosen the bolts to detach, replace and maintain the stirring frame.
[0025] (5) The brush is arranged on both sides of the stirring frame, when the first stirring assembly rotates to be close to the inner wall of the mixing barrel, the brush is in contact with the inner wall of the mixing barrel, the inner wall of the mixing barrel is cleaned in real time, and the problem of deviation of the mixing ratio caused by adhesion of the silicon nitride raw material to the inner wall of the mixing barrel is avoided.
[0026] (6) The cloth disc is arranged on the first rotating shaft, when the first rotating shaft drives the cloth disc to rotate synchronously, the cloth holes on the cloth disc are in intermittent alignment with the discharge port of the raw material bin, intermittent feeding of the silicon nitride raw material is realized, the raw material is prevented from being concentrated and accumulated in a region in the mixing barrel, the raw material is uniformly and batched dropped into the barrel along with the rotation of the cloth disc, then the raw material is batched mixed, and the overall mixing uniformity of the raw material is further improved.
[0027] (7) The overturning cylinder is arranged at the bottom of the mixing barrel, during the mixing operation stage, the overturning cylinder drives the piston rod to continuously extend and retract, drives the mixing barrel to reciprocating swing around the fixed shaft, the silicon nitride raw material in the barrel is subjected to reciprocating overturning motion on the basis of stirring, and then the mixing uniformity and the mixing efficiency are further improved. During the discharging operation stage, the piston rod of the overturning cylinder is elongated, drives the mixing barrel to overturn around the fixed shaft to the posture that the discharge port faces downward, and then raw material is rapidly discharged by the action of gravity, and the residual material in the barrel is avoided. BRIEF DESCRIPTION OF DRAWINGS
[0028] Figure 1 It is a structure schematic diagram of a silicon nitride powder mixing device.
[0029] Figure 2 It is a base schematic diagram.
[0030] Figure 3 It is a mixing barrel internal schematic diagram.
[0031] Figure 4 It is a drive mechanism schematic diagram.
[0032] Figure 5 It is a transmission box internal schematic diagram.
[0033] Figure 6 It is a first stirring assembly assembly schematic diagram.
[0034] Figure 7 It is a second stirring assembly assembly schematic diagram.
[0035] Figure 8 It is a first stirring assembly and brush explosion diagram.
[0036] In the drawing:
[0037] 1, base; 11, overturning cylinder;
[0038] 2, mixing barrel; 21, raw material bin; 22, discharge door; 23, fixed shaft; 24, inner gear ring;
[0039] 3. Drive mechanism; 31. Motor; 32. Reducer; 33. Transmission box; 34. Fixed bracket; 35. Gear disc; 36. First rotating shaft; 37. Driving gear; 38. Transition gear; 39. Driven gear; 310. Second rotating shaft;
[0040] 4. Stirring mechanism; 41. Upper turntable; 42. First connecting rod; 43. First stirring shaft; 44. First stirring assembly; 45. First gear; 46. Lower turntable; 47. Second connecting rod; 48. Second stirring shaft; 49. Second stirring assembly; 410. Second gear; 411. Bushing; 412. Brush;
[0041] 5. Fabric tray; 51. Fabric hole. Detailed Implementation
[0042] The following will be combined with the appendix Figures 1-8 The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0043] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0044] like Figure 1 As shown, a silicon nitride powder mixing device includes a base 1, a mixing tank 2, a drive mechanism 3, and a stirring mechanism 4. The upper part of the mixing tank 2 is provided with several raw material bins 21, and raw materials such as silicon powder and sintering aid are placed in the corresponding raw material bins 21. The lower part of the mixing tank 2 is provided with a discharge gate 22. The two sides of the mixing tank 2 are mounted on the base 1 through fixed shafts 23.
[0045] Drive mechanism 3 is used to drive stirring mechanism 4 to rotate, such as Figure 1 As shown, the drive mechanism 3 includes a motor 31 and a reducer 32 mounted on the upper part of the mixing tank 2, such as... Figure 4As shown, the inside of the mixing barrel 2 is fixedly connected with a transmission mechanism through a plurality of fixed supports 34, the upper end of the transmission mechanism is provided with a first rotating shaft 36, the upper end of the first rotating shaft 36 is connected with the output shaft of the speed reducer 32, the lower end of the transmission mechanism is provided with a second rotating shaft 310, and the rotating directions of the first rotating shaft 36 and the second rotating shaft 310 are opposite.
[0046] As shown in Figure 3 , Figure 6 , Figure 7 As shown, the stirring mechanism 4 includes an upper rotating disc 41 and a lower rotating disc 46, the upper rotating disc 41 is fixedly connected with the first rotating shaft 36, the lower rotating disc 46 is fixedly connected with the second rotating shaft 310, the upper rotating disc 41 is circumferentially and uniformly connected with a plurality of first connecting rods 42, the end of the first connecting rod 42 is rotatably connected with a first stirring shaft 43, and the first stirring shaft 43 is provided with a first stirring assembly 44; the lower rotating disc 46 is circumferentially and uniformly connected with a plurality of second connecting rods 47, the end of the second connecting rod 47 is rotatably connected with a second stirring shaft 48, and the second stirring shaft 48 is provided with a second stirring assembly 49.
[0047] The upper rotating disc 41 and the lower rotating disc 46 drive the first stirring assembly 44 and the second stirring assembly 49 to make revolution motion through the first connecting rod 42 and the second connecting rod 47 respectively, and because the first rotating shaft 36 and the second rotating shaft 310 rotate in opposite directions, the first stirring assembly 44 and the second stirring assembly 49 make reverse rotation motion in the barrel, form convection and shearing, effectively disperse the agglomerated materials, eliminate the mixing dead angle, and enhance the mixing effect and efficiency.
[0048] As shown in Figure 5 As shown, the transmission mechanism includes a transmission box 33, the upper part of the transmission box 33 is rotatably connected with a driving gear 37, the side wall of the transmission box 33 is rotatably connected with a transition gear 38 which is engaged with the driving gear 37, the lower part of the transmission box 33 is rotatably connected with a driven gear 39 which is engaged with the transition gear 38, the lower end of the first rotating shaft 36 is fixedly connected with the driving gear 37, and the upper end of the second rotating shaft 310 is fixedly connected with the driven gear 39.
[0049] When the motor 31 and the speed reducer 32 drive the first rotating shaft 36 to rotate, the first rotating shaft 36 drives the upper rotating disc 41 and the driving gear 37 to rotate, the upper rotating disc 41 drives the first stirring assembly 44 to do the circular stirring movement, the driving gear 37 drives the transition gear 38 to rotate, the transition gear 38 drives the driven gear 39, the second rotating shaft 310 and the lower rotating disc 46 to rotate, the lower rotating disc 46 drives the second stirring assembly 49 to do the circular stirring movement, through the meshing transmission of the driving gear 37, the transition gear 38 and the driven gear 39, the first stirring assembly 44 and the second stirring assembly 49 form the reverse rotation stirring movement state, the silicon nitride raw materials are subjected to the bidirectional shearing, convection and diffusion, the raw material particle agglomeration is effectively broken, the uniformity and sufficiency of the raw material mixing are enhanced, the mixing period is shortened, and the overall mixing efficiency is improved.
[0050] As shown in Figure 3 , the inner wall of the mixing barrel 2 is fixedly connected with an inner ring gear 24, as shown in Figure 6 , the first stirring shaft 43 is rotationally connected with the first connecting rod 42, the upper end of the first stirring shaft 43 is fixedly connected with a first gear 45, and the first gear 45 is meshed with the inner ring gear 24; as shown in Figure 4 , Figure 5 , the lower part of the transmission box 33 is provided with a toothed disc 35, as shown in Figure 7 , the second stirring shaft 48 is rotationally connected with the second connecting rod 47, the upper end of the second stirring shaft 48 is fixedly connected with a second gear 410, and the second gear 410 is meshed with the toothed disc 35.
[0051] When the first stirring assembly 44 does the revolution movement with the upper rotating disc 41, the first gear 45 is meshed with the inner ring gear 24 to drive the first stirring shaft 43 to do the rotation movement synchronously; similarly, when the second stirring assembly 49 does the revolution movement with the lower rotating disc 46, the second gear 410 is meshed with the toothed disc 35 to drive the second stirring shaft 48 to do the rotation movement synchronously. Thus, the two groups of stirring assemblies all realize the compound movement of revolution and rotation, and further, the reverse rotation movement, so as to form the three-dimensional stirring flow field in the mixing barrel 2, improve the uniformity and sufficiency of the raw material mixing, shorten the mixing period, and further improve the overall mixing efficiency.
[0052] The first stirring assembly 44 and the second stirring assembly 49 adopt the spiral stirring blades, in the rotation process of the first stirring assembly 44 and the second stirring assembly, the upward lifting force is formed on the silicon nitride raw materials by the helix angle characteristics of the spiral blades, the material in the mixing barrel 2 is driven to flow and migrate from bottom to top, and then the material up-and-down circulation convection movement state is formed in the barrel, so as to avoid the material stratification and further strengthen the mixing uniformity of the silicon nitride raw materials.
[0053] As shown in Figure 8As shown, the first stirring assembly 44 and the second stirring assembly 49 adopt a stirring frame structure, a plurality of shaft sleeves 411 are arranged on the stirring frame, and the first stirring shaft 43 and the second stirring shaft 48 are detachably connected with the shaft sleeves 411 by bolts. When the stirring assembly is worn, damaged or needs to be replaced with a stirring frame of different specifications according to the characteristics of the silicon nitride raw material, the operator does not need to disassemble the equipment body greatly, and only needs to loosen the bolts to complete the disassembly, replacement and maintenance of the stirring frame.
[0054] As shown in the Figure 8 , the first stirring assembly 44 is provided with a brush 412 on both sides, and the two ends of the brush 412 are detachably connected with the first stirring assembly 44 by bolts. When the first stirring assembly 44 rotates close to the inner wall of the mixing barrel 2, the brush 412 is in contact with the inner wall of the mixing barrel 2 for real-time cleaning of the inner wall of the mixing barrel 2, avoiding the problem of deviation of the mixing ratio caused by the adhesion of silicon nitride raw materials to the inner wall of the mixing barrel 2.
[0055] As shown in the Figure 3 , the first rotating shaft 36 is fixedly connected with a distributing disc 5, the upper end surface of the distributing disc 5 is attached to the lower surface of the upper cover of the mixing barrel 2, a plurality of uniformly distributed distributing holes 51 are arranged on the distributing disc 5, and the distributing holes 51 correspond to the positions of the discharge ports of the raw material bin 21. When the first rotating shaft 36 drives the distributing disc 5 to rotate synchronously, the distributing holes 51 on the distributing disc 5 will form a intermittent alignment cooperation state with the discharge ports of the raw material bin 21, so as to realize the intermittent feeding of the silicon nitride raw materials, avoid the accumulation of the raw materials in a certain area of the mixing barrel 2, and make the raw materials fall into the barrel uniformly and in batches with the rotation of the distributing disc 5, thereby making the materials mixed in batches and further improving the overall mixing uniformity of the raw materials.
[0056] As shown in the Figure 1 , Figure 2 , the mixing barrel 2 is suspendedly installed on the base 1, the fixed shaft 23 is movably connected with the base 1 through bearings on both sides, the base 1 is pivotally connected with a turnover cylinder 11, and the piston rod end of the turnover cylinder 11 is pivotally connected with the bottom of the mixing barrel 2.
[0057] During the mixing operation stage, the turnover cylinder 11 drives the piston rod to make continuous extension and contraction movement, drives the mixing barrel 2 to make reciprocating swing around the fixed shaft 23, and makes the silicon nitride raw materials in the barrel superimpose reciprocating turning movement on the basis of stirring, thereby further improving the mixing uniformity and mixing efficiency. During the discharging operation stage, the piston rod of the turnover cylinder 11 is elongated, drives the mixing barrel 2 to turn around the fixed shaft 23 to a posture with the discharge port downward, and realizes the rapid discharge of the raw materials by the action of gravity, avoiding the residue of the materials in the barrel.
[0058] The above is only an example and description of the structure of the utility model, and various modifications or supplements or similar replacements can be made to the described specific embodiments by those skilled in the art without departing from the scope defined by the structure of the utility model, and all of them shall belong to the protection scope of the utility model.
Claims
1. A silicon nitride powder mixing device, comprising: a base for supporting a mixing barrel; the mixing barrel is provided with a plurality of raw material bins on the upper part, and is provided with a discharge door on the lower part, and the mixing barrel is installed on the base through a fixed shaft on both sides; a drive mechanism for driving the rotation of the stirring mechanism, comprising a motor and a speed reducer installed on the upper part of the mixing barrel, characterized in that a transmission mechanism is fixedly connected inside the mixing barrel through a plurality of fixed supports, the upper end of the transmission mechanism is provided with a first rotating shaft, the upper end of the first rotating shaft is connected with the output shaft of the speed reducer, and the lower end of the transmission mechanism is provided with a second rotating shaft, and the rotating directions of the first rotating shaft and the second rotating shaft are opposite; a stirring mechanism, comprising an upper rotating disc and a lower rotating disc, the upper rotating disc is fixedly connected with the first rotating shaft, the lower rotating disc is fixedly connected with the second rotating shaft, a plurality of first connecting rods are uniformly connected circumferentially on the upper rotating disc, first stirring shafts are rotatably connected at the end portions of the first connecting rods, and first stirring assemblies are arranged on the first stirring shafts; a plurality of second connecting rods are uniformly connected circumferentially on the lower rotating disc, second stirring shafts are rotatably connected at the end portions of the second connecting rods, and second stirring assemblies are arranged on the second stirring shafts.
2. The silicon nitride powder mixing device according to claim 1, wherein The transmission mechanism comprises a transmission box, a driving gear is rotatably connected to the upper part of the transmission box, a transition gear meshing with the driving gear is rotatably connected to the side wall of the transmission box, a driven gear meshing with the transition gear is rotatably connected to the lower part of the transmission box, the lower end of the first rotating shaft is fixedly connected with the driving gear, and the upper end of the second rotating shaft is fixedly connected with the driven gear.
3. The silicon nitride powder mixing device according to claim 2, wherein An inner gear ring is fixedly connected to the inner wall of the mixing barrel, the first stirring shafts are rotatably connected with the first connecting rods, the upper end of the first stirring shaft is fixedly connected with a first gear, and the first gear is meshed with the inner gear ring; the lower part of the transmission box is provided with a toothed disc, the second stirring shafts are rotatably connected with the second connecting rods, the upper end of the second stirring shaft is fixedly connected with a second gear, and the second gear is meshed with the toothed disc.
4. The silicon nitride powder mixing device according to claim 1, wherein The first stirring assemblies and the second stirring assemblies adopt spiral stirring blades.
5. The silicon nitride powder mixing device according to claim 1, wherein The first stirring assemblies and the second stirring assemblies adopt a stirring frame structure, a plurality of shaft sleeves are arranged on the stirring frame, and the first stirring shafts and the second stirring shafts are detachably connected with the shaft sleeves through bolts.
6. The silicon nitride powder mixing device according to claim 5, wherein Brushes are arranged on both sides of the first stirring assemblies, the two ends of the brushes are detachably connected with the first stirring assemblies through bolts, the brushes are in contact with the inner wall of the mixing barrel when the first stirring assemblies rotate to be close to the inner wall of the mixing barrel, and the inner wall of the mixing barrel is cleaned in real time.
7. The silicon nitride powder mixing device according to claim 1, wherein A distributing disc is fixedly connected to the first rotating shaft, the upper end surface of the distributing disc is attached to the lower surface of the upper cover of the mixing barrel, a plurality of uniformly distributed distributing holes are arranged on the distributing disc, and the distributing holes correspond to the positions of the discharge ports of the raw material bins.
8. The silicon nitride powder mixing device according to any one of claims 1-7, characterized in that, The mixing barrel is suspendedly installed on the base, the fixed shafts are movably connected with the base through bearings on both sides, a turnover cylinder is pivoted to the base, and the piston rod end of the turnover cylinder is pivoted to the bottom of the mixing barrel.