A stirring tank
By setting first and second stirring sections on the rotating shaft of the mixing tank, and installing shear blades and impact rods in their openings, bidirectional convection is formed, which solves the problem of dead corners in the mixing process and achieves uniform mixing and efficient fusion of materials.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WENZHOU FENGRUN NEW MATERIAL CO LTD
- Filing Date
- 2025-07-15
- Publication Date
- 2026-06-09
AI Technical Summary
Existing mixing tanks are prone to creating mixing dead zones during the mixing process, resulting in uneven material distribution. This is especially true in the mixing of EVA particles and additives, where lightweight additives float or accumulate at the bottom of the tank, affecting mixing efficiency and product quality stability.
First and second stirring sections are arranged on the rotating shaft, and auxiliary stirring components, including shear blades and impact rods, are arranged in their openings. The shear blades are used to break up agglomerated materials, and the impact rods are used to disperse floating aids, forming bidirectional convection and eliminating mixing dead zones.
By employing bidirectional convection and shear crushing, the uniformity and integration of material mixing are improved, solving the problem of uneven mixing and enhancing the stirring effect.
Smart Images
Figure CN224332032U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of mechanical engineering technology, and specifically refers to a mixing tank. Background Technology
[0002] As a key piece of equipment for achieving uniform mixing of materials in industrial production, mixing tanks are widely used in plastics processing, chemical production, building materials manufacturing and other fields. Especially in the mixing process of EVA granules and additives, stirring is required to fully integrate the granules with various functional additives, so as to provide raw materials with uniform texture for subsequent processing, which directly affects the performance stability of the final product.
[0003] Existing mixing tanks often employ a single agitator structure. When the agitator rotates unidirectionally within the tank, mixing dead zones easily form at the bottom corners of the tank and in the gap between the tank wall and the agitator tip. For example, traditional mixing tanks used for EVA particle mixing typically have a flat-blade agitator design. During rotation, this pushes the material towards the tank wall, causing particles to accumulate at the bottom edge. Meanwhile, lightweight additives float to the top due to insufficient mixing force, failing to make adequate contact with the particles. Although some mixing tanks have added auxiliary agitator blades, the blades do not adapt well to the tank's contour, resulting in material stagnation zones in the transition area between the curved bottom of the tank and the vertical tank wall. This leads to localized excessively high additive concentrations or particle agglomeration in the mixed material, severely affecting mixing efficiency and product quality stability. Utility Model Content
[0004] This invention achieves the purpose of eliminating mixing dead zones and improving mixing uniformity by setting first and second stirring parts matching the bottom and top contours of the barrel at the upper and lower parts of the rotating shaft, respectively, and setting auxiliary stirring components in the openings of the two stirring parts, and making the two stirring parts circumferentially spaced 180° apart.
[0005] The purpose of this utility model is achieved as follows: a mixing tank includes a tank body, a rotating shaft rotatably disposed in the middle of the tank body, and further includes:
[0006] The first stirring part is fixed to the lower part of the rotating shaft and includes a lower radial arm extending radially from the outer periphery of the rotating shaft and a bottom side arm connecting the end of the lower radial arm to the bottom of the rotating shaft. The lower radial arm, the bottom side arm and the rotating shaft form a first opening that matches the bottom contour of the barrel.
[0007] The second stirring part is fixed on the upper part of the rotating shaft and includes two upper radial arms that extend radially from the outer periphery of the rotating shaft and are spaced apart, and a side arm connected to the end of the two upper radial arms. The upper radial arms, the side arms and the rotating shaft form a second opening that matches the top contour of the barrel.
[0008] A secondary agitator is located within the first and second openings;
[0009] The first stirring section and the second stirring section are arranged at a circumferential distance of 180° from each other on the rotation axis.
[0010] The present invention is further configured such that the auxiliary stirring component includes a plurality of shearing blades spaced apart within the first opening, and the two ends of the shearing blades are respectively fixed to the first stirring part and the rotating shaft.
[0011] The present invention is further configured such that the auxiliary stirring component includes a plurality of impact rods spaced apart within the second opening, the two ends of which are respectively fixed to the second stirring part and the rotating shaft.
[0012] The present invention is further configured such that the angle between the shearing blade and the rotating shaft is 30°-45°, and the angle between the impact rod and the rotating shaft is 60°-75°.
[0013] The present invention is further configured such that the shearing end of the shearing piece is a triangular or wedge-shaped structure.
[0014] The present invention is further configured such that the rotating shaft includes an upper shaft section and a lower shaft section detachably connected to the bottom of the upper shaft section, the first stirring part is disposed in the lower shaft section, and the second stirring part is disposed in the upper shaft section.
[0015] The present invention is further configured such that the surfaces of the shearing blade and the impact rod are coated with an antistatic coating.
[0016] By adopting the above technical solution, the beneficial effects that this utility model can achieve are:
[0017] 1. By having the first stirring part and the second stirring part circumferentially spaced 180° apart, the first stirring part stirs the material at the bottom of the barrel and the second stirring part stirs the material at the top of the barrel, forming bidirectional convection, eliminating mixing dead zones and improving the uniformity of material mixing.
[0018] 2. The shearing blades inside the first opening cooperate with the first stirring section to shear and break up the agglomerated materials as the rotating shaft rotates, which solves the problem of uneven mixing caused by material agglomeration and improves the dispersibility of the materials.
[0019] 3. The impact rod inside the second opening cooperates with the second stirring part to impact and disperse the floating light additives as the rotating shaft rotates, which solves the problem of the additives being difficult to mix and enhances the material integration. Attached Figure Description
[0020] Figure 1 This is a cross-sectional structural diagram of the present invention;
[0021] Figure 2 This is an exploded view of the rotating shaft of this utility model;
[0022] Figure 3This is a three-dimensional structural diagram of the first stirring part and the second stirring part of this utility model;
[0023] Figure 4 This is a utility model Figure 3 A magnified structural diagram of part A.
[0024] The reference numerals in the figure are as follows: 1. Barrel body; 2. Rotating shaft; 20. Upper shaft section; 21. Lower shaft section; 3. First stirring part; 30. Lower radial arm; 31. Bottom side arm; 4. First opening; 5. Second stirring part; 50. Upper radial arm; 51. Side arm; 6. Second opening; 7. Secondary stirring component; 70. Shear blade; 71. Impact rod; 8. Shear end. Detailed Implementation
[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1-4 :
[0026] Example 1:
[0027] This embodiment provides a mixing tank, including a tank body 1, a rotating shaft 2 rotatably disposed in the middle of the tank body 1, and further comprising:
[0028] The first stirring part 3 is fixed to the lower part of the rotating shaft 2, including a lower radial arm 30 extending radially from the outer periphery of the rotating shaft 2, and a bottom side arm 31 connecting the end of the lower radial arm 30 to the bottom of the rotating shaft 2. The lower radial arm 30, the bottom side arm 31 and the rotating shaft 2 form a first opening 4 that matches the bottom contour of the barrel 1.
[0029] The second stirring part 5 is fixed on the upper part of the rotating shaft 2, including two upper radial arms 50 that extend radially from the outer periphery of the rotating shaft 2 and are spaced apart, and a side arm 51 connected to the ends of the two upper radial arms 50. The upper radial arms 50, the side arms 51 and the rotating shaft 2 form a second opening 6 that matches the top contour of the barrel body 1.
[0030] The auxiliary stirring component 7 is located within the first opening 4 and the second opening 6;
[0031] The first stirring part 3 and the second stirring part 5 are arranged at a 180° interval around the rotating shaft 2.
[0032] The barrel body 1 serves as a container for the materials to be mixed, providing a sealed space to hold the EVA granules and additives to be mixed, and supporting the internal rotating components and mixing structure. The barrel body 1 is generally barrel-shaped, typically cylindrical or frustum-shaped, with a closed structure at the bottom and top. The barrel body 1 is usually a one-piece molded structure, and may have a discharge port at the bottom and a feed port or observation window at the top.
[0033] The rotating shaft 2, as a power transmission component, connects to a drive device such as a motor, transmitting rotational power to the first stirring section 3 and the second stirring section 5, causing them to rotate around the axis to achieve the stirring function. The rotating shaft 2 is rod-shaped and vertically positioned in the middle of the tank body 1. It can be connected to the top or bottom of the tank body 1 via bearings or other components to ensure smooth rotation. The rotating shaft 2 is connected to the drive device via a coupling or direct drive, and is fixedly connected to the first stirring section 3 and the second stirring section 5.
[0034] The first mixing section 3 mixes the material at the bottom of the barrel 1. Through a specific structure, the material at the bottom can be pushed upward and spread to the surroundings, eliminating the dead corners of mixing at the bottom.
[0035] The lower radial arm 30 extends radially from the rotating shaft 2, providing radial stirring force to push the material from near the rotating shaft 2 towards the barrel wall, breaking the laminar flow state of the material in the radial direction. The lower radial arm 30 is plate-shaped or rod-shaped, extending horizontally radially along the rotating shaft 2, and its cross-section can be rectangular, circular, or airfoil-shaped to reduce resistance during rotation. The lower radial arm 30 can be fixed to the circumference of the rotating shaft 2 by welding, key connection, or bolt fixing, and its end is connected to the bottom arm 31.
[0036] The bottom arm 31 connects the end of the lower radial arm 30 to the bottom of the rotating shaft 2, forming a closed contour structure that guides the material to flow upward along the arc-shaped surface of the barrel bottom, preventing material accumulation in the corners of the barrel bottom. The bottom arm 31 is arc-shaped or inclined, and its curvature matches the contour of the inner surface of the bottom of the barrel body 1. The bottom arm 31 is located at the bottom of the barrel body 1, with its lower end connected to the bottom of the rotating shaft 2 and its upper end connected to the end of the lower radial arm 30. The bottom arm 31, the lower radial arm 30, and the rotating shaft 2 can all be connected by welding or bolts to form a stable triangular frame.
[0037] The second stirring section 5 stirs the material at the top of the barrel 1. Through a specific structure, the material at the top is pressed down and dispersed to the surroundings, forming convection in conjunction with the first stirring section 3, thus eliminating the dead zone of mixing at the top.
[0038] The upper radial arm 50 extends radially from the rotating shaft 2, providing radial stirring force to push the material from near the rotating shaft 2 towards the barrel wall, breaking the laminar flow state of the material in the top region. The upper radial arm 50 is plate-shaped or rod-shaped, extending horizontally radially along the rotating shaft 2, and its cross-section can be rectangular, circular, or airfoil-shaped to reduce resistance during rotation. Both upper radial arms 50 can be fixed to the circumference of the rotating shaft 2 by welding, keying, or other fixing methods, and the two upper radial arms 50 are arranged vertically at intervals, with their ends connected to the side arm 51.
[0039] The side arms 51 connect the ends of the two upper radial arms 50 to form a closed contour structure, guiding the material to flow downward along the barrel wall and preventing the accumulation of light additives at the top. The side arms 51 can be arc-shaped or vertical, and their shapes are consistent with the contour of the inner surface of the top of the barrel body 1. The side arms 51 are located in the top area of the barrel body 1 and maintain a certain gap from the barrel wall to ensure smooth material flow. Both ends of the side arms 51 can be fixedly connected to the two radially spaced arms by welding or bolting, forming a stable frame similar to the shape of "冂".
[0040] The auxiliary stirring member 7 is used to assist the first stirring part 3 and the second stirring part 5 in refining the material, enhancing the mixing effect.
[0041] In this embodiment, the driving device drives the rotating shaft 2 to rotate, causing the first stirring part 3 fixed to the lower part of the rotating shaft 2 and the second stirring part 5 fixed to the upper part to rotate synchronously; the lower radial arm 30 of the first stirring part 3 radially pushes the bottom material to the barrel wall, and the bottom edge arm 31 conforms to the contour of the barrel bottom to push the material upward, forming an upward flow through the first opening 4; the upper radial arm 50 of the second stirring part 5 radially pushes the top material, and the side arm 51 conforms to the barrel wall to press the material downward, forming a downward flow through the second opening 6; since the first stirring part 3 and the second stirring part 5 are circumferentially spaced 180°, their rotation directions are opposite, thus forming a two-way convection cycle of "bottom material upward and top material downward" in the barrel body 1. The auxiliary stirring member 7 refines the material in the opening, finally achieving the effect of eliminating mixing dead angles and improving stirring uniformity.
[0042] Embodiment 2:
[0043] This embodiment provides a stirring barrel, which has the following technical features in addition to the technical solutions of the above embodiment.
[0044] The auxiliary stirring member 7 includes a plurality of shear slices 70 arranged at intervals in the first opening 4, and both ends of the shear slices 70 are respectively fixed to the first stirring part 3 and the rotating shaft 2.
[0045] In this embodiment, by arranging a plurality of shear slices 70 arranged at intervals in the first opening 4, the special structure and connection method are used to enhance the crushing and dispersion effect on the material. The shear slices 70 are usually flat, and both ends of them can be fixed between the lower radial arm 30, the bottom edge arm 31 of the first stirring part 3 and the rotating shaft 2 by welding or bolting, forming a stable support structure. When the first stirring part 3 rotates with the rotating shaft 2, the shear slices 70 rotate synchronously, forcibly shearing and crushing the EVA particle aggregates passing through the first opening 4, solving the problem of pushing rather than crushing due to the high toughness of the particles, reducing the accumulation of unbroken particles in the dead corners, and at the same time cooperating with the overall movement of the first stirring part 3, pushing the crushed particles upward to participate in the overall convection cycle, further improving the mixing uniformity.
[0046] Example 3:
[0047] This embodiment provides a mixing tank, which, in addition to the technical solutions of the above embodiments, also has the following technical features.
[0048] The auxiliary stirring component 7 also includes a plurality of impact rods 71 spaced apart within the second opening 6, with the two ends of the impact rods 71 fixed to the second stirring part 5 and the rotating shaft 2, respectively.
[0049] In this embodiment, multiple impact rods 71 arranged at intervals are provided within the second opening 6, and their special structure and connection method enhance the dispersing and mixing effect of lightweight additives. The impact rods 71 are typically cylindrical or prismatic, and their ends are respectively fixed to the upper radial arm 50, side arm 51, and rotating shaft 2 of the second stirring section 5 by welding or bolting, forming a stable support structure. When the second stirring section 5 rotates with the rotating shaft 2, the impact rods 71 rotate synchronously, impacting and dispersing the lightweight additives passing through the second opening 6 at high speed. Utilizing the multi-point dispersion characteristics of the rod-shaped structure, the additive particles floating on the liquid surface are evenly dispersed into the material flow, solving the problem of additive agglomeration caused by buoyancy in traditional stirring. Simultaneously, the impact rods 71 and the shearing blades 70 work synergistically in the axial direction; the shearing blades 70 break the bottom particles, and the impact rods 71 disperse the top additives, ensuring that materials of different densities are fully mixed within the container, improving overall mixing efficiency.
[0050] The synergistic effect of the shearing blade 70 and the impact rod 71 is as follows: after the shearing blade 70 breaks up the agglomerated particles at the bottom, the material is conveyed upward through the first stirring section 3; the impact rod 71 presses the light additives that have been broken up at the top downward into the material flow, and the two converge in the middle of the barrel 1 to form a forced mixing zone, thereby eliminating the stratification phenomenon.
[0051] Example 4:
[0052] This embodiment provides a mixing tank, which, in addition to the technical solutions of the above embodiments, also has the following technical features.
[0053] The angle between the shearing blade 70 and the rotating shaft 2 is 30°-45°, and the angle between the impact rod 71 and the rotating shaft 2 is 60°-75°.
[0054] In this embodiment, by setting the angle between the shear blade 70 and the rotating shaft 2 to 30°-45° and the angle between the impact rod 71 and the rotating shaft 2 to 60°-75°, the design adapts to the characteristics of different materials and mixing requirements. The small angle design of the shear blade 70 allows it to cut into agglomerated particles at an angle that is closer to the material flow direction when rotating with the first mixing section 3, enhancing the targeted shearing and crushing and preventing particles from being pushed rather than crushed due to excessive angle. The large angle design of the impact rod 71 allows it to generate a stronger lateral impact force on floating lightweight additives when rotating with the second mixing section 5, expanding the impact range and improving the dispersion effect. The differentiated settings of the two angles allow the shear blade 70 and the impact rod 71 to exert force precisely in their respective areas of action, further improving the uniformity and efficiency of material mixing.
[0055] Example 5:
[0056] This embodiment provides a mixing tank, which, in addition to the technical solutions of the above embodiments, also has the following technical features.
[0057] The shearing end 8 of the shearing blade 70 has a triangular or wedge-shaped structure.
[0058] In this embodiment, by setting the shearing end 8 of the shearing blade 70 to a triangular or wedge-shaped structure, the sharpened line contact characteristics enhance the shearing effect. The triangular or wedge-shaped structure reduces the contact area between the shearing blade 70 and the material to the edge, forming a concentrated shearing force. Compared with a planar structure, it is easier to cut into EVA particle agglomerates, avoiding being pushed and slipped due to the high toughness of the particles. This structure, combined with the angle between the shearing blade 70 and the rotating shaft 2, can efficiently cut and break up agglomerated particles when rotating with the first stirring part 3, reducing the accumulation of uncrushed particles in the dead corners at the bottom of the barrel, providing a more dispersed material basis for subsequent mixing with additives, and improving the overall mixing uniformity.
[0059] Example 6:
[0060] This embodiment provides a mixing tank, which, in addition to the technical solutions of the above embodiments, also has the following technical features.
[0061] The rotating shaft 2 includes an upper shaft section 20 and a lower shaft section 21 detachably connected to the bottom of the upper shaft section 20. The first stirring part 3 is disposed in the lower shaft section 21, and the second stirring part 5 is disposed in the upper shaft section 20.
[0062] In this embodiment, the rotating shaft 2 is divided into an upper shaft section 20 and a lower shaft section 21, and connected by detachable methods such as bolts or snap-fit connections. This allows the lower shaft section 21, where the first stirring part 3 is located, and the upper shaft section 20, where the second stirring part 5 is located, to be disassembled and assembled separately. When it is necessary to clean the EVA particles remaining at the bottom of the tank 1 or to maintain the first stirring part 3, the lower shaft section 21 can be disassembled separately, avoiding the cumbersome operation of disassembling the entire unit. Similarly, if it is necessary to maintain the second stirring part 5, the upper shaft section 20 can be handled separately. This modular design reduces the difficulty of equipment maintenance and allows for targeted replacement or repair of components in different stirring areas, extending the overall service life of the equipment while ensuring the stability of the stirring structure and not affecting normal stirring operations.
[0063] Example 7:
[0064] This embodiment provides a mixing tank, which, in addition to the technical solutions of the above embodiments, also has the following technical features.
[0065] The surfaces of the shearing blade 70 and the impact rod 71 are covered with an antistatic coating.
[0066] In this embodiment, an antistatic coating is applied to the surfaces of the shear blade 70 and the impact rod 71. This antistatic coating can be a conductive polymer coating or a metal-based coating, such as a polypyrrole coating or a nickel-based composite coating. By reducing the surface resistance, electrostatic adsorption is eliminated, ensuring smooth material flow. The antistatic coating can be applied by spraying or dipping to ensure a tight bond between the coating and the surfaces of the shear blade 70 and the impact rod 71, eliminating the electrostatic force generated by friction between the material and the components. When the shear blade 70 and the impact rod 71 rotate with the stirring section and come into contact with EVA particles and additives, the antistatic coating can prevent the generation and accumulation of static electricity. This avoids the formation of new mixing dead zones due to electrostatic adsorption, causing material to adhere to the surfaces of the shear blade 70 and the impact rod 71 and the corners of the barrel 1. This ensures that the material is always in a flowing state and participates in the circulating mixing, while reducing component wear caused by material adhesion, extending the service life of the shear blade 70 and the impact rod 71, and ensuring the stability of stirring efficiency and mixing uniformity.
[0067] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.
Claims
1. A mixing tank, comprising a tank body (1) and a rotating shaft (2) rotatably disposed in the middle of the tank body (1), characterized in that, Also includes: The first stirring part (3) is fixed to the lower part of the rotating shaft (2) and includes a lower radial arm (30) extending radially from the outer periphery of the rotating shaft (2) and a bottom side arm (31) connecting the end of the lower radial arm (30) and the bottom of the rotating shaft (2). The lower radial arm (30), the bottom side arm (31) and the rotating shaft (2) form a first opening (4) that matches the bottom contour of the barrel body (1). The second stirring part (5) is fixed on the upper part of the rotating shaft (2) and includes two upper radial arms (50) that extend radially from the outer periphery of the rotating shaft (2) and are spaced apart, and a side arm (51) connected to the end of the two upper radial arms (50). The upper radial arms (50), the side arm (51) and the rotating shaft (2) form a second opening (6) that matches the top contour of the barrel body (1). A secondary agitator (7) is located within the first opening (4) and the second opening (6); The first stirring part (3) and the second stirring part (5) are arranged 180° apart in the circumferential direction of the rotating shaft (2).
2. The mixing tank according to claim 1, characterized in that, The auxiliary stirring component (7) includes a plurality of shearing blades (70) spaced apart in the first opening (4), with the two ends of the shearing blades (70) fixed to the first stirring part (3) and the rotating shaft (2) respectively.
3. A mixing tank according to claim 2, characterized in that, The auxiliary stirring component (7) also includes a plurality of impact rods (71) spaced apart in the second opening (6), with the two ends of the impact rods (71) fixed to the second stirring part (5) and the rotating shaft (2) respectively.
4. A mixing tank according to claim 3, characterized in that, The angle between the shearing blade (70) and the rotating shaft (2) is 30°-45°, and the angle between the impact rod (71) and the rotating shaft (2) is 60°-75°.
5. A mixing tank according to claim 2, characterized in that, The shearing end (8) of the shearing blade (70) has a triangular or wedge-shaped structure.
6. A mixing tank according to claim 1, characterized in that, The rotating shaft (2) includes an upper shaft section (20) and a lower shaft section (21) detachably connected to the bottom of the upper shaft section (20). The first stirring part (3) is located in the lower shaft section (21), and the second stirring part (5) is located in the upper shaft section (20).
7. A mixing tank according to claim 3, characterized in that, The surfaces of the shearing blade (70) and the impact rod (71) are covered with an antistatic coating.