Anti-settling efficient mixing device for water-based paint production

Abstract

The utility model provides an anti-settling high-efficiency mixing device for water-based paint production, which comprises a mixing tank, a driving unit, a rotating main shaft, an upper-layer axial-flow paddle, a lower-layer radial-flow paddle and a bottom scraping and sweeping unit, the driving unit is arranged at the top of the mixing tank, the output end of the driving unit is fixedly connected with the top end of the rotating main shaft, and the bottom scraping and sweeping unit is arranged on the rotating main shaft. The rotating main shaft extends into the mixing tank from the top of the mixing tank along the central axis of the mixing tank, the bottom end of the rotating main shaft is hinged to the bottom of the mixing tank, and the upper-layer axial-flow type paddle, the lower-layer radial-flow type paddle and the bottom scraping and sweeping unit are fixedly connected with the rotating main shaft and are sequentially arranged along the rotating main shaft from top to bottom; an inclined angle is formed between the blade surface of the upper-layer axial-flow type blade and the horizontal plane; and the lower-layer radial flow type paddle is a turbo type paddle. A three-dimensional circulating flow field is formed in the tank body, mixing dead angles at the center of the tank bottom and the corners of the tank wall are eliminated, and sedimentation of pigment and filler in water-based paint is effectively prevented.

Description

Technical Field

[0001] This utility model relates to a coating mixing device, specifically a high-efficiency mixing device for preventing sedimentation in the production of water-based coatings, belonging to the technical field of coating production equipment. Background Technology

[0002] As an environmentally friendly coating, the mixing and dispersion process in the production of water-based coatings is crucial. Water-based coatings typically consist of multiple components, including water-based resin emulsions, pigments, fillers, and additives, which vary significantly in density. Current production processes commonly employ mixing devices consisting of single or multiple layers of similar agitator blades within a mixing tank. When this traditional mixing device operates, the material primarily undergoes horizontal circular motion within the tank, easily forming a large vortex at the center. On one hand, a dead zone with extremely poor mixing occurs at the bottom center of the mixing tank due to the low linear velocity, causing a large amount of denser pigment and filler particles to settle and accumulate in this area. On the other hand, when the material undergoes high-speed circular motion, centrifugal force throws some heavy particles against the tank wall, causing them to slide down to the corners of the bottom, forming a ring-shaped settling layer. These settling problems not only lead to uneven mixing, causing color and performance differences between batches, but also increase the difficulty of subsequent cleaning, material loss, and reduce production efficiency. Utility Model Content

[0003] Based on the above background, the purpose of this utility model is to provide an anti-settling and high-efficiency mixing device for the production of water-based coatings, and to solve the problem of pigment and filler settling in water-based coatings caused by insufficient mixing in the prior art.

[0004] To achieve the above-mentioned objectives, this utility model provides the following technical solution:

[0005] An anti-settling high-efficiency mixing device for water-based coating production includes a mixing tank, a drive unit, a rotating main shaft, upper axial-flow blades, lower radial-flow blades, and a bottom scraping unit. The drive unit is located at the top of the mixing tank, and its output end is fixedly connected to the top of the rotating main shaft. The rotating main shaft extends from the top of the mixing tank along its central axis into the tank, and its bottom end is hinged to the bottom of the mixing tank. The upper axial-flow blades, the lower radial-flow blades, and the bottom scraping unit are fixedly connected to the rotating main shaft and arranged sequentially from top to bottom along the rotating main shaft. The blade surface of the upper axial-flow blades is inclined at an angle to the horizontal plane and is used to push the material in the mixing tank axially towards the lower part of the mixing tank. The lower radial-flow blades are turbine blades and are used to push the material in the mixing tank radially from the central region towards the inner wall of the mixing tank.

[0006] The upper axial flow blades generate the axial mainstream, the lower radial flow blades generate localized strong radial shear flow, and the bottom scraping unit is responsible for handling the bottom sedimentation. This three-section combined structure can form a mixed flow field in the mixing tank, changing the traditional single flow field mode.

[0007] Preferably, the upper axial flow blade includes at least three propeller plates, each of which has the same inclination angle to the horizontal plane.

[0008] The propeller plate can efficiently generate axial thrust, driving the material in the tank to circulate from top to bottom with minimal energy consumption.

[0009] Preferably, the lower radial impeller includes a disk and a plurality of turbine blades perpendicular to the outer surface of the disk, wherein the plurality of turbine blades are evenly spaced along the outer circumference of the disk.

[0010] The turbine structure generates radial flow. When rotating at high speed, it can forcefully throw the material from the center to the surroundings, and accelerate and disperse the material pushed down by the upper axial flow blades. At the same time, it creates strong turbulence and shearing effects on the material in the lower part of the tank.

[0011] Preferably, the bottom scraping unit includes a scraper arm and a plow-type scraper. One end of the scraper arm is fixedly connected to the bottom of the rotating main shaft, and the other end of the scraper arm is fixedly connected to the plow-type scraper. The edge of the plow-type scraper is provided with flexible scraping strips.

[0012] The plow-type scraper can not only scrape when rotating, but also turn up the settled material at the bottom of the tank, so that it can re-enter the mixing cycle.

[0013] Preferably, the flexible scraper is made of polytetrafluoroethylene or polyurethane.

[0014] Preferably, the device further includes at least two baffles, which are evenly distributed and fixed to the inner wall of the mixing tank along the circumference of the mixing tank.

[0015] Preferably, the turbulence baffle includes an upper baffle section that slopes downwards and a lower baffle section that slopes upwards. The upper baffle section has an inverted herringbone structure, and the lower baffle section has an upright herringbone structure.

[0016] The aforementioned baffle structure has a better active flow guiding effect. When the horizontally circulating material collides with the baffle, it will be forcibly diverted in both the upward and downward directions, enhancing the axial mixing effect and turbulence intensity near the tank wall.

[0017] Preferably, the lower end of the baffle plate has a gap with the inner bottom wall of the mixing tank that allows the bottom scraping unit to pass through.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] This utility model discloses an anti-settling high-efficiency mixing device for water-based coating production. Through the structural combination of three different functional components—upper axial flow, lower radial flow, and bottom scraping—a three-dimensional circulating flow field is formed in the tank, eliminating mixing dead zones in the center of the tank bottom and corners of the tank wall, effectively preventing the settling of pigments and fillers in the water-based coating. The axial and radial flows in the tank, combined with the turbulence generated by the baffle, further improve the mixing and dispersion efficiency of the water-based coating, ensuring the uniformity of the coating components in the finished product. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the external structure of an anti-settling high-efficiency mixing device for the production of water-based coatings according to this utility model;

[0022] Figure 2 This is a schematic diagram of the internal structure of an anti-settling high-efficiency mixing device for the production of water-based coatings according to this utility model;

[0023] In the diagram: 1. Mixing tank; 2. Rotating main shaft; 3. Upper axial flow impeller; 4. Lower radial flow impeller; 5. Bottom scraping unit; 6. Baffle; 7. Drive unit; 11. Feed inlet; 31. Propeller blade; 41. Wheel; 42. Turbine blade; 51. Scraper arm; 52. Plow-type scraper; 53. Flexible scraper; 61. Upper baffle section; 62. Lower baffle section. Detailed Implementation

[0024] The technical solution of this utility model will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings. It should be understood that the implementation of this utility model is not limited to the following embodiments, and any modifications and / or alterations made to this utility model will fall within the protection scope of this utility model.

[0025] In this invention, unless otherwise specified, all parts and percentages are by weight, and the equipment and raw materials used are commercially available or commonly used in the field. Unless otherwise specified, the methods in the following embodiments are conventional methods in the field. Unless otherwise specified, the components or equipment in the following embodiments are general standard parts or components known to those skilled in the art, and their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0026] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the following detailed description, many specific details are set forth to facilitate explanation and provide a comprehensive understanding of the embodiments of the present invention. However, one or more embodiments may be practiced by those skilled in the art without these specific details.

[0027] An embodiment of this utility model discloses an anti-settling high-efficiency mixing device for the production of water-based coatings, such as... Figure 1 and Figure 2 As shown, the device includes a mixing tank 1, a drive unit 7, a rotating main shaft 2, an upper axial flow impeller 3, a lower radial flow impeller 4, and a bottom scraping unit 5.

[0028] The mixing tank 1 is equipped with a feed inlet 11 at the top.

[0029] The drive unit 7 is located at the top of the mixing tank 1, and its output end is fixedly connected to the top of the rotating main shaft 2. The drive unit 7 consists of a variable frequency motor and a reducer to achieve precise adjustment of the stirring speed. These are existing technologies and will not be described in detail here.

[0030] The rotating spindle 2 extends from the top of the mixing tank 1 along its central axis into the tank. To ensure the stability of the rotating spindle 2 when stirring high-viscosity materials, its bottom end is hinged to the center of the bottom of the mixing tank 1 via bearings or other structures, forming a stable support. The upper axial flow impeller 3, the lower radial flow impeller 4, and the bottom scraping unit 5 are fixedly connected to the rotating spindle 2 and are arranged sequentially from top to bottom along the rotating spindle 2.

[0031] The upper axial-flow impeller 3 has its blade surface inclined at an angle to the horizontal plane. The upper axial-flow impeller 3 is used to push the material in the mixing tank 1 axially towards the lower part of the mixing tank 1. In this embodiment, the upper axial-flow impeller 3 includes three propeller plates 31, each with its surface inclined at the same angle to the horizontal plane, specifically 30°. Of course, the inclination angle can be adjusted within the range of 30°-45° depending on the specific application scenario. When the rotating main shaft 2 rotates, the propeller plates 31 forcefully push the lower-density resin emulsion and liquid additives from the upper part and surface of the mixing tank 1 axially towards the lower middle part of the tank.

[0032] The lower radial flow impeller 4 is a turbine impeller, used to push the material in the mixing tank 1 radially from the central region towards the inner wall of the mixing tank 1. In this embodiment, the lower radial flow impeller 4 includes a disk 41 and six turbine blades 42 perpendicular to the outer surface of the disk 41. The six turbine blades 42 are evenly spaced along the outer circumference of the disk 41, forming a typical six-straight-blade turbine structure. After the material pushed down by the upper axial flow impeller 3 reaches this point, it is forcefully thrown radially from the central region towards the inner wall of the mixing tank 1 by the high-speed rotating turbine blades 42. This process generates extremely high shear force and turbulence, which can effectively break up agglomerates of pigments and fillers and prevent the formation of slow-flowing areas near the main shaft. In this embodiment, only one lower radial flow impeller 4 is provided. In specific applications, the number of lower radial flow impellers 4 can be appropriately increased according to the changes in tank volume.

[0033] The bottom scraping unit 5 includes a scraper arm 51 and a plow-type scraper 52. One end of the scraper arm 51 is fixedly connected to the bottom of the rotating main shaft 2, and the other end of the scraper arm 51 is fixedly connected to the plow-type scraper 52. The edge of the plow-type scraper 52 is provided with flexible scraper strips 53. The side of the plow-type scraper 52 facing the direction of rotation has a forward-inclined surface. When it rotates, it not only scrapes the bottom material but also uses this inclined surface to flip up the scraped heavy sediment and push it towards the center, allowing it to be captured by the suction of the lower-level radial impeller 4, thus re-entering the mixing cycle. To achieve thorough scraping, the flexible scraper strips 53 are located at the edge of the forward-inclined surface of the plow-type scraper 52, and the flexible scraper strips 53 are in close contact with the bottom of the tank. The flexible scraper strips 53 are made of polytetrafluoroethylene (PTFE) or polyurethane.

[0034] To further enhance the turbulence effect of the material inside the tank and break the overall rotation of the material, the device also includes four turbulence baffles 6. These baffles 6 are evenly distributed circumferentially along the mixing tank 1 and longitudinally fixed to the inner wall of the mixing tank 1. Each turbulence baffle 6 includes an upper baffle section 61 inclined downwards and a lower baffle section 62 inclined upwards. The upper baffle section 61 has an inverted herringbone structure, and the lower baffle section 62 has an upright herringbone structure. When the material ejected at high speed by the lower radial impeller 4 impacts the turbulence baffle 6, it is forcibly diverted upwards and downwards by its special inclined surface, thereby generating strong up-and-down tumbling and convection near the tank wall, completely breaking the laminar flow state and preventing material adhesion and settling on the wall surface. Simultaneously, to ensure unimpeded movement of the bottom scraping unit 5, the lower end of the turbulence baffle 6 has a gap between it and the inner bottom wall of the mixing tank 1, allowing the bottom scraping unit 5 to pass through.

[0035] The device works as follows: after startup, the drive unit 7 drives the rotating main shaft 2 to rotate. The upper axial flow blades 3 generate a strong downward mainstream, which is transformed into a high-speed radial flow at the lower radial flow blades 4. This mainstream then interacts with the turbulence baffles 6 to generate strong turbulence. Particles settled at the bottom are continuously agitated by the bottom scraping unit 5 and sent back to the mainstream area. A three-dimensional circulating flow field without dead angles is formed throughout the mixing tank 1, ensuring that materials with large density differences in the water-based coating can be uniformly mixed.

[0036] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A high-efficiency mixing device for preventing settling in the production of water-based coatings, characterized in that: The device includes a mixing tank (1), a drive unit (7), a rotating main shaft (2), an upper axial flow impeller (3), a lower radial flow impeller (4), and a bottom scraping unit (5). The drive unit (7) is located at the top of the mixing tank (1), and the output end of the drive unit (7) is fixedly connected to the top of the rotating main shaft (2). The rotating main shaft (2) extends from the top of the mixing tank (1) along the central axis of the mixing tank (1) and enters its interior. The bottom end of the rotating main shaft (2) is hinged to the bottom of the mixing tank (1). The upper axial flow impeller (3)... The lower radial flow blade (4) and the bottom scraping unit (5) are fixedly connected to the rotating main shaft (2) and are arranged sequentially from top to bottom along the rotating main shaft (2); the blade surface of the upper axial flow blade (3) is inclined at an angle to the horizontal plane, and the upper axial flow blade (3) is used to push the material in the mixing tank (1) axially towards the lower part of the mixing tank (1); the lower radial flow blade (4) is a turbine blade, and the lower radial flow blade (4) is used to push the material in the mixing tank (1) radially from the central area towards the inner wall of the mixing tank (1).

2. The anti-settling high-efficiency mixing device for water-based coating production according to claim 1, characterized in that: The upper axial flow blade (3) includes at least three propulsion plates (31), each of which has the same tilt angle to the horizontal plane.

3. The anti-settling high-efficiency mixing device for water-based coating production according to claim 1, characterized in that: The lower radial impeller (4) includes a disk (41) and a plurality of turbine blades (42) perpendicular to the outer surface of the disk (41), and the plurality of turbine blades (42) are evenly spaced along the outer circumference of the disk (41).

4. The anti-settling high-efficiency mixing device for water-based coating production according to claim 1, characterized in that: The bottom scraping unit (5) includes a scraper arm (51) and a plow-type scraper (52). One end of the scraper arm (51) is fixedly connected to the bottom of the rotating main shaft (2), and the other end of the scraper arm (51) is fixedly connected to the plow-type scraper (52). The edge of the plow-type scraper (52) is provided with a flexible scraper strip (53).

5. The anti-settling high-efficiency mixing device for water-based coating production according to claim 4, characterized in that: The flexible scraper (53) is made of polytetrafluoroethylene or polyurethane.

6. The anti-settling high-efficiency mixing device for water-based coating production according to claim 1, characterized in that: The device also includes at least two baffles (6), which are evenly distributed and fixed to the inner wall of the mixing tank (1) along the circumference of the mixing tank (1).

7. The anti-settling high-efficiency mixing device for water-based coating production according to claim 6, characterized in that: The turbulence baffle (6) includes an upper baffle section (61) that slopes downward from top to bottom and a lower baffle section (62) that slopes upward from bottom to top. The upper baffle section (61) has an inverted herringbone structure, and the lower baffle section (62) has an upright herringbone structure.

8. The anti-settling high-efficiency mixing device for water-based coating production according to claim 6, characterized in that: The lower end of the baffle (6) has a gap with the inner bottom wall of the mixing tank (1) that allows the bottom scraping unit (5) to pass through.

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