A double planetary stirring device based on a three-roller machine

Abstract

The utility model discloses a double planetary stirring device based on three roller machine relates to material mixing equipment technical field. The device includes stirring kettle, planetary transmission mechanism, first stirring paddle and three roller dispersion mechanism. The three roller dispersion mechanism is connected as second stirring paddle with planetary transmission mechanism, and with first stirring paddle parallel in stirring kettle and makes planetary motion. Three roller dispersion mechanism includes mounting bracket, three axial parallel and sequentially adjacent setting feed roller, middle roller and discharge roller, and forms two narrow shearing gap between roller cylinder, and drive arrangement drives roller cylinder to rotate with different linear velocity, and the scraper is located below the discharge roller. The utility model combines the high strength shearing dispersion of three roller machine with the global mixing of double planetary stirring machine, effectively solves the problem of traditional equipment dispersion capacity deficiency, and existence dead angle and high temperature rise, especially suitable for high viscosity material's high precision, high efficiency dispersion mixing.

Description

Technical Field

[0001] This utility model relates to the field of material mixing equipment technology, specifically to a double planetary stirring device for mixing and dispersing high-viscosity materials (such as slurry, adhesive, ink, cosmetics, etc.). Background Technology

[0002] Planetary mixers are widely used in the mixing of high-viscosity materials. They typically consist of a mixing vessel and two planetary impellers (usually one is a frame impeller and the other a dispersion disc) that move in a planetary motion within the vessel. The frame impeller primarily handles large-area mixing, while the high-speed rotating dispersion disc refines and disperses the material through strong shearing action. However, existing dispersion disc structures have the following limitations when handling materials containing extremely high hardness or large-diameter particles: Limited dispersion capability: For products requiring extremely fine particle size and extremely high uniformity, the shear force provided by the dispersion disc may not be sufficient to completely break up the soft agglomerates between particles, making it difficult to achieve nanoscale dispersion.

[0003] Dead zones are easily formed: The dispersion disc mainly acts on the area near its surface. The shearing force is weak on the material on the wall and bottom of the mixing vessel, which can easily form dead zones and affect the overall consistency of the product.

[0004] High temperature rise: Relying on high-speed rotating dispersion discs for shearing, the energy input is concentrated, which can easily lead to a rapid rise in material temperature, making it unfriendly to heat-sensitive materials.

[0005] The three-roll mill is a classic dispersing device. Through the different linear velocities and narrow gaps between the three rollers, it can generate extremely strong shear and extrusion forces, resulting in excellent dispersion. However, most three-roll mills are currently independent, open-type devices and cannot be integrated into a closed, dual-planetary mixing system for unified operation.

[0006] Therefore, there is an urgent need for a new type of equipment that integrates the super-strong dispersing ability of a three-roll mill with the efficient mixing ability of a dual planetary mixer. Utility Model Content

[0007] The technical problem to be solved by this utility model is to overcome the shortcomings of existing double planetary mixers, such as insufficient dispersion capacity, dead zones, and temperature rise. It provides a new device that integrates a three-roll mill inside a double planetary mixer, so as to achieve more efficient, more uniform, and gentler dispersion of materials.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A dual planetary mixer based on a three-roll mill, comprising: A mixing vessel is used to hold materials. The planetary transmission mechanism is located above the mixing vessel; The first stirring paddle is connected to the planetary transmission mechanism and moves in a planetary motion inside the mixing vessel for mixing the main material. The three-roller dispersion mechanism is connected to the planetary transmission mechanism as the second stirring paddle and is arranged in parallel with the first stirring paddle to perform planetary motion in the mixing vessel. The three-roller dispersing mechanism includes: Mounting bracket, fixed to the planetary transmission mechanism; Three axially parallel rollers are rotatably mounted on a mounting bracket and are arranged adjacently as a feed roller, intermediate roller, and discharge roller along the material transfer path; narrow shearing gaps are formed between the feed roller and the intermediate roller, and between the intermediate roller and the discharge roller. A drive unit, mounted on a mounting bracket, is used to drive at least one of the rollers to rotate and to make the three rollers rotate toward each other at different linear velocities; A scraper plate, located below the discharge roller, is used to scrape the material dispersed by the roller off the surface of the discharge roller.

[0009] In a preferred embodiment, the drive device is an independent servo motor or hydraulic motor, which obtains power through a slip ring assembly or a wireless power supply module mounted on the planetary transmission mechanism.

[0010] In a preferred embodiment, the three rollers are made of high-hardness, high-wear-resistant materials, including alloy steel, ceramic, or metal rollers with hard chrome plating.

[0011] In a preferred embodiment, the driving device is a servo motor, which is connected to the roller shaft of the intermediate roller through a reducer, and the servo motor and the reducer are integrated as a whole module on the mounting bracket.

[0012] In a preferred embodiment, the first stirring paddle is a frame-type stirring paddle, and the gap between its scraping blade and the inner wall of the stirring vessel is 1-5 mm.

[0013] In a preferred embodiment, the stirred tank has a jacketed structure, and a cooling medium can circulate within the jacket.

[0014] In a preferred embodiment, the planetary transmission mechanism includes a central gear driven by a planetary drive motor, and planetary gears meshing with the central gear to drive the rotating frame of the first stirring paddle and the three-roller dispersion mechanism to revolve.

[0015] In a more preferred embodiment, the first stirring paddle and the three-roller dispersing mechanism are arranged in a centrally symmetrical manner on the rotating frame.

[0016] In a preferred embodiment, the diameter ratio of the feed roller, intermediate roller, and discharge roller is (0.8~1.2):1:(0.8~1.2).

[0017] Compared with the prior art, the technical solution of this utility model has the following beneficial effects: 1) Significantly improved dispersion effect: The three-roll mill provides linear shear force and extrusion force far exceeding that of the dispersion disc, which can effectively break hard particles and soft agglomerates. It is especially suitable for preparing ultrafine, high-precision slurries, with dispersion fineness reaching micron or even nanometer level.

[0018] 2) No dead angle dispersion: The three-roller dispersion mechanism revolves with the planetary frame, which can process materials in all areas of the mixing vessel. Combined with the wall scraping action of the frame-type stirring paddle, it realizes true full-area mixing and dispersion without dead angles.

[0019] 3) Superior temperature rise control: The three-roll mill mainly operates through the extrusion and shearing forces between the rollers. Compared to a high-speed rotating dispersion disc, its energy input is gentler, more efficient, and generates less heat. Combined with jacket cooling in the mixing vessel, it can better control the process temperature, making it suitable for heat-sensitive materials.

[0020] 4) Integrated design: The three-roll mill is cleverly integrated into the planetary motion system, which realizes the mixing and ultra-strong dispersion in the same sealed container in one go, improving production efficiency and avoiding the pollution and loss caused by the transfer of materials between multiple devices. Attached Figure Description

[0021] The accompanying drawings, which constitute a part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 A schematic diagram of the structure of a double planetary mixer based on a three-roll mill is shown.

[0022] Legend: 1. Stirring vessel; 2. Planetary drive motor; 3. First stirring paddle (frame stirring paddle); 4. Three-roller dispersion mechanism. Detailed Implementation

[0023] To make the objectives, technical solutions, and effects of this utility model clearer and more explicit, the present utility model will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0024] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such usage can be interchanged where appropriate. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a system, product, or device that comprises a series of units is not necessarily limited to those explicitly listed, but may include other units not explicitly listed or inherent to such products or devices.

[0025] like Figure 1 As shown, the present invention provides a double planetary mixing device based on a three-roll mill, which mainly includes a mixing tank 1, a planetary transmission mechanism, a first mixing paddle 3, and a three-roll dispersion mechanism 4.

[0026] The mixing vessel 1 is the core container for holding materials, and its top is open or has a sealable lid. Preferably, the mixing vessel 1 has a jacketed structure, and the jacket allows cooling media such as cooling water or heat transfer oil to circulate, thereby effectively controlling the temperature of the materials during the mixing and dispersion process, which is especially suitable for heat-sensitive materials.

[0027] A planetary transmission mechanism is positioned above the mixing vessel 1 and is driven by a planetary drive motor 2. In a preferred embodiment, the planetary transmission mechanism includes a central gear driven by the planetary drive motor 2 and planetary gears meshing with the central gear. The planetary gears drive a rotatable rotating frame to revolve.

[0028] The first stirring paddle 3 is connected to the rotating frame via a connecting rod. In this embodiment, the first stirring paddle 3 is a frame-type stirring paddle, the shape of which is adapted to the inner wall contour of the mixing vessel 1. The edge of the frame-type stirring paddle 3 is provided with a wall-scraping blade, and the gap between the wall-scraping blade and the inner wall of the mixing vessel 1 is set to 1-5mm to ensure that the frame-type stirring paddle 3 can scrape off the material on the vessel wall when it is performing planetary motion (i.e., a combined motion of revolution and rotation), achieving mixing without dead angles.

[0029] The three-roller dispersing mechanism 4 is a key improvement of this invention. It is also fixed to the rotating frame of the planetary transmission mechanism via its mounting bracket and is arranged side-by-side with the frame-type stirring paddle 3. Preferably, the first stirring paddle 3 and the three-roller dispersing mechanism 4 are arranged symmetrically on the rotating frame to optimize the dynamic balance of the entire rotating system and reduce vibration and noise during equipment operation.

[0030] In this embodiment, the three-roller dispersing mechanism 4 specifically includes: Mounting bracket: Provides support and positioning for the entire mechanism, and revolves together with the rotating frame.

[0031] Three rollers: Three rollers are arranged parallel to each other along the axial direction and rotatably supported on a mounting bracket. They are arranged adjacent to each other along the material transfer path and are defined as the feed roller, intermediate roller, and discharge roller, respectively. Two narrow shear gaps, i.e., roller gaps, are formed between the cylindrical surfaces of the feed roller and the intermediate roller, and between the cylindrical surfaces of the intermediate roller and the discharge roller, respectively. These three rollers are made of high-hardness, high-wear-resistant materials, such as alloy steel, ceramic, or hard chrome-plated metal rollers. Further, the preferred diameter ratio of the feed roller, intermediate roller, and discharge roller is (0.8~1.2):1:(0.8~1.2).

[0032] Drive unit: Mounted on the mounting bracket, it drives at least one of the rollers (typically an intermediate roller) to rotate. In a preferred embodiment, the drive unit is a separate servo motor connected to the roller shaft of the intermediate roller via a reducer, and integrated as a single module on the mounting bracket. Since the mounting bracket is in a revolution state, the power for the drive unit is obtained through a slip ring assembly (or a wireless power supply module) mounted on a planetary transmission mechanism. After the servo motor drives the intermediate roller to rotate, the friction between the roller surfaces causes the feed roller and discharge roller to rotate in opposite directions, and the electronic control system maintains different linear velocities for the three rollers.

[0033] Scraper: Fixedly installed below the discharge roller, with its cutting edge close to the surface of the discharge roller, used to scrape the material dispersed by the three rollers off the surface of the discharge roller.

[0034] The working principle of this utility model is as follows: During operation, the planetary drive motor 2 starts, driving the rotating frame, frame-type stirring paddle 3, and three-roller dispersing mechanism 4 to revolve together. The frame-type stirring paddle 3 simultaneously scrapes and mixes the material over a wide area, while the three-roller dispersing mechanism 4, revolving within the vessel, continuously rotates, capturing and dispersing the material in its path. 1. Feeding and Initial Shearing: The material is first fed into the first gap between the feed roller and the intermediate roller. At this time, the drive device (servo motor) drives the intermediate roller to rotate, and through friction, drives the feed roller and the discharge roller to rotate in opposite directions and at different linear velocities. Typically, their speed relationship is set as: intermediate roller > discharge roller > feed roller. Under the combined action of this speed difference and the narrow gap, the material is subjected to strong compression and shearing in the first gap, completing the first dispersion.

[0035] 2. Transfer and Secondary Fine Shearing: After the initial shearing, the material adheres to the fastest-rotating intermediate roller and is transferred to the second gap between the intermediate roller and the discharge roller. This second gap is typically set smaller than the first gap, and the speed difference between the intermediate roller and the discharge roller is greatest. Therefore, the material undergoes a more intense and finer second shearing at this point, which is a key step in achieving ultra-high dispersion accuracy at the micron or even nanometer level.

[0036] 3. Scraping and Circulation: After two high-intensity shearing dispersions, the material adheres to the surface of the discharge roller in an extremely thin film form. As it rotates downwards with the roller, it is precisely scraped off by the scraper and falls back into the main material of the mixing tank 1.

[0037] This "capture-shear-return" process circulates throughout the entire vessel as the planetary mechanism of the three-roll mill revolves until all materials achieve the desired ultrafine dispersion and extremely high uniformity. Throughout the process, the three-roll mill primarily operates through extrusion and shearing forces, resulting in a gentle energy input. Combined with the jacketed cooling of the stirred vessel 1, the temperature rise of the materials can be effectively controlled.

[0038] In summary, this invention overcomes the shortcomings of existing double planetary mixers, such as insufficient dispersion capacity, dead zones, and temperature rise, and provides a novel device that integrates a three-roll mill inside a double planetary mixer, achieving more efficient, uniform, and gentle dispersion of materials.

[0039] The specific embodiments of this utility model have been described in detail above, but they are only examples, and this utility model is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions to this utility model are also within the scope of this utility model. Therefore, all equivalent changes and modifications made without departing from the spirit and scope of this utility model should be covered within the scope of this utility model.

Claims

1. A double planetary mixer based on a three-roll mill, characterized in that, include: A stirring vessel (1) is used to contain materials; A planetary transmission mechanism is located above the stirring vessel (1); The first stirring paddle (3) is connected to the planetary transmission mechanism and performs planetary motion in the stirring vessel (1) for mixing the main material; The three-roller dispersion mechanism (4) is connected to the planetary transmission mechanism as the second stirring paddle and is arranged in parallel with the first stirring paddle (3) to perform planetary motion in the stirring vessel (1); The three-roller dispersing mechanism (4) includes: Mounting bracket, fixed to the planetary transmission mechanism; Three axially parallel rollers are rotatably mounted on a mounting bracket and are arranged adjacently as a feed roller, intermediate roller, and discharge roller along the material transfer path; narrow shearing gaps are formed between the feed roller and the intermediate roller, and between the intermediate roller and the discharge roller. A drive unit, mounted on a mounting bracket, is used to drive at least one of the rollers to rotate and to make the three rollers rotate toward each other at different linear velocities; A scraper plate, located below the discharge roller, is used to scrape the material dispersed by the roller off the surface of the discharge roller.

2. The double planetary mixer based on a three-roll mill according to claim 1, characterized in that, The drive device is an independent servo motor or hydraulic motor, which obtains power through a slip ring assembly or a wireless power supply module mounted on the planetary transmission mechanism.

3. The dual planetary mixer based on a three-roll mill according to claim 1 or 2, characterized in that, The three rollers are made of high-hardness, high-wear-resistant materials, including alloy steel, ceramic, or metal rollers with hard chrome plating.

4. The dual planetary mixer based on a three-roll mill according to claim 2, characterized in that, The driving device is a servo motor, which is connected to the roller shaft of the intermediate roller through a reducer, and the servo motor and the reducer are integrated as a whole module on the mounting bracket.

5. The dual planetary mixer based on a three-roll mill according to claim 1, characterized in that, The first stirring paddle (3) is a frame-type stirring paddle, and the gap between its scraping blade and the inner wall of the stirring vessel (1) is 1-5mm.

6. The dual planetary mixer based on a three-roll mill according to claim 1, characterized in that, The stirred tank (1) has a jacket structure, and the cooling medium can flow through the jacket.

7. The dual planetary mixer based on a three-roll mill according to claim 1, characterized in that, The planetary transmission mechanism includes a central gear driven by a planetary drive motor (2) and a planetary gear meshing with the central gear to drive the first stirring paddle (3) and the rotating frame of the three-roller dispersion mechanism (4) to revolve.

8. The dual planetary mixer based on a three-roll mill according to claim 7, characterized in that, The first stirring paddle (3) and the three-roller dispersion mechanism (4) are arranged in a centrally symmetrical manner on the rotating frame.

9. The dual planetary mixer based on a three-roll mill according to claim 1, characterized in that, The diameter ratio of the feed roller, intermediate roller, and discharge roller is (0.8~1.2):1:(0.8~1.2).

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