Powder mixing device and transmission assembly

Abstract

The utility model discloses a kind of powder mixing equipment and transmission assembly, the power output end of the transmission assembly is with the stirring device transmission connection of the powder mixing equipment, the power input end of the transmission assembly is with driving part transmission connection;The transmission assembly includes: stirring shaft, the stirring shaft is with the stirring device transmission connection;Belt pulley, the belt pulley is installed on the stirring shaft, and the belt pulley is connected with the output shaft of driving part by belt transmission;Sealing structure, the sealing structure is installed on the stirring shaft, to realize the sealing of the stirring shaft and barrel bottom.This transmission assembly sealing structure sealing performance is better, and it is convenient to soak and clean.

Description

Technical Field

[0001] This utility model relates to the field of mixing equipment technology, specifically to a powder mixing equipment and transmission components. Background Technology

[0002] In technical scenarios such as flour mixing, where powder and solution need to be mixed, existing technologies mostly use powder mixing equipment for mixing.

[0003] Taking noodle mixing machines as an example, existing powder mixing equipment has the following technical problems: In existing technologies, transmission components in powder mixing equipment often employ packing seals, labyrinth seals, oil skeleton seals, and mechanical seals. However, packing seals, under heavy loads, exhibit a crescent-shaped gap between the packing and shaft, leading to uneven stress and wear on the packing over extended periods, making leakage likely. Furthermore, replacement is difficult and maintenance is inconvenient. Labyrinth seals require multiple labyrinth cavities, necessitating larger machining volumes, resulting in higher material and machining costs, and are difficult to clean, creating unsanitary areas. Oil skeleton seals require multiple components, often resulting in complex structures, making replacement and maintenance difficult in equipment with high cleanliness requirements, and cleaning inconvenient. Mechanical seals have complex structures requiring high machining precision, leading to high manufacturing difficulty and costs. Utility Model Content

[0004] Therefore, this utility model provides a powder mixing device and a transmission component to solve at least one of the above-mentioned technical problems.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A transmission assembly for a powder mixing device, wherein the power output end of the transmission assembly is connected to the stirring device of the powder mixing device, and the power input end of the transmission assembly is connected to a driving component; the transmission assembly includes: A stirring shaft, which is connected to the stirring device in a driving manner; A pulley is mounted on the stirring shaft and is connected to the output shaft of the drive unit via a belt. A sealing structure is installed on the stirring shaft to achieve a seal between the stirring shaft and the bottom of the container.

[0006] In some embodiments, the sealing structure includes: The mounting base has a skeleton oil seal installed at its upper end and a bearing mounting seat installed at its lower end. The outer periphery of the mounting base is provided with a sealing groove and an oil injection nozzle, and the interior is provided with an air seal chamber seat. A sealing ring, which is fitted into the sealing groove; An air tube rod passes through the mounting base and is assembled and connected to the air seal chamber seat; A bearing sealing assembly is installed on the stirring shaft and is sealed to the air seal chamber seat.

[0007] In some embodiments, the bearing seal assembly includes: A bearing mounting base, wherein a bearing is respectively mounted on its upper and lower ends; The upper sealing seat is installed on the stirring shaft and has a skeleton oil seal inside. The upper sealing seat is installed above the bearing mounting seat and presses against the bearing at the upper end of the bearing mounting seat. The upper sealing seat is sealed to the air seal cavity seat through a combined sealing ring. The lower sealing seat is installed on the stirring shaft and has a skeleton oil seal inside it. The lower sealing seat is installed below the bearing mounting seat and presses against the bearing at the lower end of the bearing mounting seat.

[0008] In some embodiments, an angular contact bearing is fitted onto the upper end of the bearing mounting base, and the upper sealing seat presses against the angular contact bearing.

[0009] In some embodiments, two deep groove ball bearings are assembled at the lower end of the bearing mounting base, and the lower sealing seat presses against the deep groove ball bearings.

[0010] In some embodiments, the sealing groove is an O-ring, and the sealing ring is an O-ring.

[0011] This utility model also provides a powder mixing device, including the transmission component described above.

[0012] In one or more of the above specific embodiments, the sealing assembly provided by this utility model has the following technical effects: 1. Multiple sealing mechanisms work together to completely solve leakage problems and ensure material cleanliness and environmental safety.

[0013] The combined seal constructs a leak-free barrier, forming a triple-seal protection through the combination of a skeleton oil seal, a VD sealing ring, and a gas seal chamber seat. The skeleton oil seal is in contact with the stirring shaft at the top of the mounting base, inside the upper sealing seat, and inside the lower sealing seat, respectively, blocking the flow of material or impurities between the stirring shaft and the components. The VD sealing ring connects the gas seal chamber seat and the upper sealing seat, filling the sealing blind spot at the component connection. The gas seal chamber seat, together with the air pipe rod, introduces compressed air to form an air curtain, further preventing the intrusion of external impurities or the overflow of internal materials. It completely avoids the problems of easy leakage and material contamination of existing sealing structures (such as single oil seals and packing seals), and is especially suitable for the stringent "zero pollution" requirements of the pharmaceutical and food industries.

[0014] The O-ring is embedded in the O-groove on the outside of the mounting base to achieve a fixed end seal between the mounting base and the silo / cylinder; the oil seal spacer ring cooperates with the upper skeleton oil seal of the mounting base to strengthen the dynamic seal in the middle of the stirring shaft; the inner skeleton oil seal of the lower sealing seat prevents bearing grease from overflowing and contaminating materials, while also preventing external dust from entering the bearing, forming a full-node seal coverage of the fixed end, rotating end, and bearing end, completely solving the leakage and contamination problems caused by the incomplete sealing of the existing structure.

[0015] 2. Optimize bearing support and lubrication design to improve structural stability and service life.

[0016] The bearing mounting base is fitted with an angular contact bearing at the upper end and two deep groove ball bearings at the lower end. The bearing spacers are used to position the deep groove ball bearings at intervals, forming a graded load-bearing structure for composite loads and radial loads. This avoids accelerated wear of a single bearing due to uneven load. At the same time, the lock nut engages with the keyway of the stirring shaft to lock and fix the inner sleeve of the deep groove ball bearing, ensuring that the bearing rotates synchronously with the stirring shaft. This prevents additional wear caused by relative sliding and significantly improves the smoothness of the stirring shaft operation.

[0017] The grease nipple and the grease injection hole of the bearing spacer form a dedicated lubrication channel, allowing grease to be added to the deep groove ball bearing without disassembling the structure. This avoids the low maintenance efficiency and component disassembly and assembly wear problems caused by the traditional structure that requires disassembly of the bearing for lubrication. Continuous lubrication ensures that the bearing friction coefficient is reduced, reducing heat and wear caused by dry friction, extending the overall service life of the bearing and agitator shaft, and reducing equipment operation and maintenance costs.

[0018] 3. The detachable and reverse-installation design greatly improves maintenance convenience and adapts to cleanroom requirements. The air seal chamber seat and mounting base, bearing mounting seat and upper and lower sealing seats, pulley and stirring shaft are all detachably connected by screws or threads, allowing worn parts (such as skeleton oil seals and VD sealing rings) to be replaced individually without destructive disassembly, reducing maintenance difficulty and cost. Attached Figure Description

[0019] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0020] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0021] Figure 1 This is one of the structural schematic diagrams of the powder mixing equipment provided by this utility model; Figure 2 This is the second structural schematic diagram of the powder mixing equipment provided by this utility model; Figure 3 This is the third structural schematic diagram of the powder mixing equipment provided by this utility model; Figure 4 This is the fourth structural schematic diagram of the powder mixing equipment provided by this utility model; Figure 5 This is the fifth structural schematic diagram of the powder mixing equipment provided by this utility model; Figure 6 This is the sixth structural schematic diagram of the powder mixing equipment provided by this utility model; Figure 7 This is one of the structural schematic diagrams of the sealing structure in the powder mixing equipment provided by this utility model; Figure 8 This is the second schematic diagram of the sealing structure in the powder mixing equipment provided by this utility model; Figure 9 This is the third schematic diagram of the sealing structure in the powder mixing equipment provided by this utility model; Figure 10 This is the fourth schematic diagram of the sealing structure in the powder mixing equipment provided by this utility model; Figure 11 This is the fifth schematic diagram of the sealing structure in the powder mixing equipment provided by this utility model.

[0022] Explanation of reference numerals in the attached figures: 1-Frame assembly, 2-Transmission assembly, 3-Unloading assembly, 4-Mixing device, 5-Mixing tank; 6-Adjustable pressurized spray assembly, 7-Drive component, 8-Control system; 21-Agitator shaft, 22-C-key, 23-Oil seal spacer ring, 24-Skeleton oil seal, 25-Mounting base; 26-O-ring seal, 27-Gas seal chamber seat, 28-Combination seal, 29-Gas tube rod; 210 - Upper seal, 211 - Angular contact bearing, 212 - Bearing mounting base, 213 - Deep groove ball bearing; 214-Oil injection nozzle, 215-Bearing spacer ring, 216-Lower seal seat, 217-Sealing lock nut; 218 - Pulley, 219 - Pulley lock plate. Detailed Implementation

[0023] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. 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.

[0024] In one specific implementation, such as Figures 1-6 As shown, the powder mixing equipment provided by this utility model includes a frame assembly, a mixing tank, a mixing device, and a transmission assembly; wherein, the mixing tank is installed on the frame assembly, the inner cavity of the mixing tank forms a material mixing chamber, and the side wall of the mixing tank has a discharge port communicating with the material mixing chamber; the mixing element of the mixing device is disposed in the material mixing chamber, the power output end of the transmission assembly is connected to the mixing device, and the power input end of the transmission assembly is connected to the drive element.

[0025] Furthermore, the powder mixing equipment also includes a control system. The control system controls the opening of the butterfly valve at the feed inlet to allow various materials in the upper hopper to enter the mixing tank. After the valve is closed, the control system controls the stirring device to start, and the various materials are pre-mixed for about 5 seconds. After mixing is completed, the adjustable pressurized spray assembly is controlled to spray the solution for 10-15 seconds. After spraying stops, the stirring device continues to stir for about 15 seconds. The control system opens the unloading assembly to unload for about 15 seconds. The stirring device stops, and the cleaning cylinder works to clean the material. After the work is completed, the unloading cylinder closes the unloading hopper door.

[0026] During operation, the drive component (such as a motor) transmits power to the mixing device through a transmission assembly. The mixing component rotates within the material mixing chamber, shearing and mixing the input materials (such as flour and water). After mixing, the material is discharged through the outlet of the mixing tank. The frame assembly provides overall support for the equipment. The cooperation between the mixing device and the transmission assembly ensures uniform mixing of the powder. The modular structure facilitates assembly and maintenance. The frame assembly can be a welded steel frame or a bolted assembly frame. The drive component can be a hydraulic motor or an electric motor, and the transmission assembly can use gear transmission or belt transmission, etc.

[0027] Specifically, the bottom of frame component 1 is equipped with perforated feet, which can be fixed to the ground. Figure 1 Taking the direction shown as an example, the upper surface of the top right side of frame assembly 1 is equipped with a welded nut, which is connected and fixed to the mixing tank 5 by bolts. The lower surface of the top right side of frame assembly 1 is also equipped with a welded nut, which is connected and fixed to the transmission assembly 2 by bolts. The outer circle of transmission assembly 2 is equipped with an O-ring, which fits with the inner wall of the bottom circular hole of mixing tank 5 for positioning and sealing. Transmission assembly 2 is equipped with a drive shaft, the upper end of which is installed and fitted with the stirring device 4 by threads. The lower end of transmission assembly 2 is equipped with a pulley, which is connected to the drive component 7 by a belt. The drive component 7 is installed in the lower left part of the interior of frame assembly 1 and is fixed by screws. Adjustable pressurized spray assembly 6 is installed on the upper part of mixing tank 5 and fixed by buckle connection. Adjustable pressurized spray assembly 6 is equipped with four evenly distributed nozzles that extend into the interior of mixing tank 5 to achieve directional, quantitative, and timed spraying of solution. The other end of the spray pipeline is connected to the solution tank through a hose. The upper center inlet of adjustable pressurized spray assembly 6 is also provided. The unloading assembly 3 is installed at the lower right side of the mixing tank 5. The unloading assembly 3 is fixed to the mixing tank 5 with bolts. The unloading assembly 3 is equipped with a unloading valve flap, which is sealed to the mixing tank 5 with an O-ring to ensure its sealing performance during long-term operation. The control system 8 is welded to the upper left side of the frame assembly 1. Various control elements are installed inside the control system 8, and control lines and air pipes are connected to the various actuators through the inside of the frame.

[0028] In a specific application scenario, taking a noodle mixer as an example, for use in noodle mixing systems in the food industry, please refer to [link / reference needed]. Figures 1-6The powder mixing equipment includes a frame assembly 1, a transmission assembly 2, a discharge assembly 3, a mixing device 4, a mixing drum 5, an adjustable pressurized spray assembly 6, a drive assembly 7, and a control system 8. The mixing drum 5 has a mounting hole for the transmission assembly 2 at its bottom center, a discharge port on its right bottom side, and a mounting port for the adjustable pressurized spray assembly 6 at its top. The interior of the mixing drum 5 is a mixing chamber used to hold and mix flour flakes. Flour enters the mixing chamber through the inlet hole on the adjustable pressurized spray assembly 6, is mixed by the mixing device 4, and then discharged to the outside of the drum through the discharge port. The bottom of the mixing drum has evenly distributed threaded bottom holes, which are fixed to the frame assembly 1 with screws. The mixing device 4 is installed at one end of the transmission assembly 2 and locked with threads. The other end of the transmission assembly 2 is equipped with a pulley, which is connected to a pulley installed on the drive assembly 7 via a belt. The drive assembly 7 is installed inside the lower left side of the frame assembly 1, fixed with screws, and has an adjustable tension structure. The adjustable pressurized spray assembly 6 is installed on top of the mixing tank 5. An O-ring is provided on the top of the mixing tank 5, and the adjustable pressurized spray assembly 6 is sealed to the mixing tank 5 via the O-ring. Externally, it is fixed by a snap fastener connection. The adjustable pressurized spray assembly 6 has a feed inlet at its center, which can be connected to a hopper via a flexible connector for feeding. The adjustable pressurized spray assembly 6 has a spray pipe, and four evenly distributed solid conical nozzles are installed inside the assembly. The nozzles are connected to the pipe, and the spray areas of the four solid conical nozzles are uniformly tangent, ensuring thorough contact with the flour. A control valve is provided at the other end of the spray pipe, and the valve is connected to the spray pressurization tank via a pipeline. The discharge assembly 3 is installed on the bottom right side of the mixing tank 5 and has a discharge port. The discharge assembly 3 has an O-ring for sealing the discharge port and is fixed by screws.

[0029] This invention employs a sealing structure for transmission components to improve sealing performance, facilitate soaking and cleaning, and reduce costs.

[0030] In some embodiments, such as Figures 7-11 As shown, the transmission assembly includes a stirring shaft 21, a pulley 218, and a sealing structure. The stirring shaft 21 is connected to the stirring element, the pulley is mounted on the stirring shaft 21, and the pulley is connected to the output shaft of the drive element via a belt. The sealing structure is mounted on the stirring shaft 21 to achieve a seal between the stirring shaft 21 and the bottom of the container. The function of the sealing structure is to prevent materials and solutions from entering the bearings at the bottom of the stirring shaft, contaminating materials, and damaging the transmission assembly.

[0031] The sealing structure includes a mounting base 25, an O-ring 26, a gas tube 29, a bearing mounting seat 212, an upper sealing seat 210, and a lower sealing seat 216. A skeleton oil seal 24 is mounted on the upper end of the mounting base 25, and the bearing mounting seat 212 is mounted on the lower end. The outer periphery of the mounting base 25 is provided with an O-groove and an oil inlet 214, and an air seal chamber seat 27 is installed inside. The O-ring 26 is embedded in the O-groove. The gas tube 29 passes through the mounting base 25 and is assembled and connected to the air seal chamber seat 27. An angular contact shaft is mounted on the upper end of the bearing mounting seat 212. The bearing 211 has two deep groove ball bearings 213 mounted at its lower end; the upper sealing seat 210 is installed on the stirring shaft 21 and has a skeleton oil seal 24 inside it. The upper sealing seat 210 is installed above the bearing mounting seat 212 and presses against the angular contact bearing 211. The upper sealing seat 210 is sealed to the gas seal cavity seat 27 through a combined sealing ring 28; the lower sealing seat 216 is installed on the stirring shaft 21 and has a skeleton oil seal 24 inside it. The lower sealing seat 216 is installed below the bearing mounting seat 212 and presses against the deep groove ball bearing 213.

[0032] The rotary sealing structure for the output stirring shaft provided in this embodiment is used in material mixing equipment in the machinery, chemical, pharmaceutical, and food industries. Taking the aforementioned noodle mixer as an example, a skeleton oil seal 24 is installed on the upper part of the mounting base 25, its position limited by a snap ring. An O-ring seal 26 is installed on the outside of the mounting base 25, forming a seal with the hopper or cylinder through the O-ring seal 26. An air seal chamber seat 27 is installed on the upper part of the inner side of the mounting base 25, fixed by screws. The lower part of the air seal chamber seat 27 is connected to one end of a combined sealing ring 28. The lower part of the mounting base 25 is fixed to the bearing mounting seat 212 by screws. An angular contact bearing 211 is installed on the upper end of the bearing mounting seat 212 and pressed by an upper sealing seat 210. The upper sealing seat 210 is fixed to the bearing mounting seat 212 by screws, and the other end of the combined sealing ring 28 is connected and sealed to the upper sealing seat 210. Two deep groove ball bearings 213 are mounted on the lower end of the bearing mounting base 212. The two deep groove ball bearings 213 are separated by a bearing spacer 215, which has a grease injection hole for lubrication. A sealing lock nut 217 locks the inner sleeve of the deep groove ball bearing 213 through the thread and keyway on the stirring shaft 21. A lower sealing seat 216 is installed on the lower part of the bearing mounting base 212 and fixed by screws, pressing the outer sleeve of the deep groove ball bearing 213. A skeleton oil seal 24 is installed on the lower sealing seat 216 to seal the grease and prevent it from overflowing and polluting the environment. A C-key 22 is installed on the upper part of the stirring shaft 21, and an oil seal spacer 24 is installed in the middle. The oil seal spacer 23 cooperates with the skeleton oil seal 24 for sealing. A pulley 218 is installed on the lower part of the stirring shaft 21 and is locked and fixed by a pulley locking plate 219. The air tube rod 29 passes through the mounting base 25 and is installed on the air seal chamber seat 27, and the oil nozzle 214 is installed on the outside of the mounting base 25.

[0033] In one or more of the above specific embodiments, the sealing assembly provided by this utility model has the following technical effects: 1. Multiple sealing mechanisms work together to completely solve leakage problems and ensure material cleanliness and environmental safety.

[0034] The combined seal constructs a leak-free barrier, forming a triple-seal protection through a skeleton oil seal, a VD sealing ring, and a gas seal chamber seat. The skeleton oil seal is in contact with the stirring shaft at the top of the mounting base, inside the upper sealing seat, and inside the lower sealing seat, respectively, blocking the flow of material or impurities between the stirring shaft and the components. The VD sealing ring connects the gas seal chamber seat and the upper sealing seat, filling the sealing blind spot at the component connection. The gas seal chamber seat, together with the air pipe rod, introduces compressed air to form an air curtain, further preventing the intrusion of external impurities or the overflow of internal materials. It completely avoids the problems of easy leakage and material contamination of existing sealing structures (such as single oil seals and packing seals), and is especially suitable for the stringent zero-pollution requirements of the pharmaceutical and food industries.

[0035] The O-ring is embedded in the O-groove on the outside of the mounting base to achieve a fixed end seal between the mounting base and the silo or cylinder; the oil seal spacer ring cooperates with the upper skeleton oil seal of the mounting base to strengthen the dynamic seal in the middle of the stirring shaft; the inner skeleton oil seal of the lower sealing seat prevents bearing grease from overflowing and contaminating materials, while also preventing external dust from entering the bearing, forming a full-node seal coverage of the fixed end, rotating end, and bearing end, completely solving the leakage and contamination problems caused by the incomplete sealing of the existing structure.

[0036] 2. Optimize bearing support and lubrication design to improve structural stability and service life.

[0037] The bearing mounting base is fitted with an angular contact bearing at the upper end and two deep groove ball bearings at the lower end. The bearing spacers are used to position the deep groove ball bearings at intervals, forming a graded load-bearing structure for composite loads and radial loads. This avoids accelerated wear of a single bearing due to uneven load. At the same time, the lock nut engages with the keyway of the stirring shaft to lock and fix the inner sleeve of the deep groove ball bearing, ensuring that the bearing rotates synchronously with the stirring shaft. This prevents additional wear caused by relative sliding and significantly improves the smoothness of the stirring shaft operation.

[0038] The grease nipple and the grease injection hole of the bearing spacer form a dedicated lubrication channel, allowing grease to be added to the deep groove ball bearing without disassembling the structure. This avoids the low maintenance efficiency and component disassembly and assembly wear problems caused by the traditional structure that requires disassembly of the bearing for lubrication. Continuous lubrication ensures that the bearing friction coefficient is reduced, reducing heat and wear caused by dry friction, extending the overall service life of the bearing and agitator shaft, and reducing equipment operation and maintenance costs.

[0039] 3. The detachable and reverse-installation design greatly improves the convenience of maintenance and adapts to cleanroom requirements.

[0040] The air seal chamber seat and mounting base, bearing mounting seat and upper and lower sealing seats, pulley and stirring shaft are all detachably connected by screws or threads. Wear parts (such as skeleton oil seals and VD sealing rings) can be replaced individually without destructive disassembly, solving the problem of existing sealing structures being integrally molded and requiring overall replacement when damaged in a localized manner, thus reducing maintenance difficulty and cost.

[0041] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above are only specific embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made on the basis of the technical solution of this utility model should be included within the scope of protection of this utility model.

Claims

1. A transmission assembly for use in a powder mixing device, characterized in that, The power output end of the transmission assembly is connected to the stirring device of the powder mixing equipment, and the power input end of the transmission assembly is connected to the driving component; the transmission assembly includes: A stirring shaft, which is connected to the stirring device in a driving manner; A pulley is mounted on the stirring shaft and is connected to the output shaft of the drive unit via a belt. A sealing structure is installed on the stirring shaft to achieve a seal between the stirring shaft and the bottom of the container.

2. The transmission assembly according to claim 1, characterized in that, The sealing structure includes: The mounting base has a skeleton oil seal installed at its upper end and a bearing mounting seat installed at its lower end. The outer periphery of the mounting base is provided with a sealing groove and an oil injection nozzle, and the interior is provided with an air seal chamber seat. A sealing ring, which is fitted into the sealing groove; An air tube rod passes through the mounting base and is assembled and connected to the air seal chamber seat; A bearing sealing assembly is installed on the stirring shaft and is sealed to the air seal chamber seat.

3. The transmission assembly according to claim 2, characterized in that, The bearing sealing assembly includes: A bearing mounting base, wherein a bearing is respectively mounted on its upper and lower ends; The upper sealing seat is installed on the stirring shaft and has a skeleton oil seal inside. The upper sealing seat is installed above the bearing mounting seat and presses against the bearing at the upper end of the bearing mounting seat. The upper sealing seat is sealed to the air seal cavity seat through a combined sealing ring. The lower sealing seat is installed on the stirring shaft and has a skeleton oil seal inside it. The lower sealing seat is installed below the bearing mounting seat and presses against the bearing at the lower end of the bearing mounting seat.

4. The transmission assembly according to claim 3, characterized in that, An angular contact bearing is assembled on the upper end of the bearing mounting base, and the upper sealing seat presses against the angular contact bearing.

5. The transmission assembly according to claim 3, characterized in that, Two deep groove ball bearings are assembled at the lower end of the bearing mounting base, and the lower sealing seat presses against the deep groove ball bearings.

6. The transmission assembly according to claim 2, characterized in that, The sealing groove is an O-ring, and the sealing ring is an O-ring.

7. A powder mixing device, characterized in that, Includes the transmission assembly as described in any one of claims 1-6.

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