A recirculating attrition mill

Abstract

The utility model relates to the technical field of powder grinding equipment, concretely to a circulating stirring mill, including roof, outer tube, inner tube, feeding unit and stirring mechanism, the interlayer formed by inner tube and outer tube is equipped with feeding unit, and the feeding unit includes spiral feeding pipe and annular injection pipe below and with it is in the open circuit, the inner wall department of annular injection pipe is equipped with a plurality of feed pipe who extends to the inner wall of inner tube, the top of spiral feeding pipe is in the open circuit with the discharge pipe of inner tube bottom through the connecting pipe, the stirring mechanism includes motor, spiral stirring blade, first stirring subassembly and second stirring subassembly, the middle part of stirring blade in first stirring subassembly is equipped with second stirring subassembly, the circulating stirring mill provided by the utility model can realize the technical effect of uniform feeding, high -efficient stirring and circulation, accurate temperature control simultaneously, has important practical significance.

Description

Technical Field

[0001] This utility model relates to the field of grinding equipment technology, specifically a circulating stirring mill. Background Technology

[0002] In industries such as chemical engineering, building materials, and metallurgy, stirred mills are core equipment for material grinding, and their performance directly affects production efficiency and product quality. However, existing stirred mill equipment has the following technical shortcomings in practical applications:

[0003] 1. Traditional stirred mills typically employ a single-point feeding mode, where material enters from a single inlet at the top or side of the mill cylinder. This results in severely uneven material distribution within the grinding chamber. In ceramic raw material processing, single-point feeding leads to localized material accumulation within the grinding chamber, while other areas remain relatively sparse. This not only reduces the utilization rate of the grinding media but also results in low grinding efficiency, significant variations in finished product particle size, and negatively impacts the quality of subsequent product molding, increasing the defect rate. Furthermore, this feeding method easily causes material splashing, leading to material waste. Splashed material adheres to the inner wall of the grinding chamber, forming stubborn scale that is difficult to clean. Frequent cleaning increases maintenance costs and reduces equipment operating rates.

[0004] 2. Traditional stirred mills are equipped with only a single-layer stirring component, making it difficult to create a complex and efficient flow field during the stirring process. When dealing with high-viscosity slurries or large particles, the single-layer stirring component cannot fully disperse the material, resulting in a large number of dead zones in the grinding chamber. Consequently, the material does not have sufficient contact with the grinding media, significantly reducing the grinding effect.

[0005] 3. Traditional stirred mills only perform a single grinding process before discharging the material. For materials that require ultrafine grinding, such as nano-sized powders in the electronics and information industry, the mill must be repeatedly stopped to unload and re-feed the material, which is cumbersome and increases energy consumption, making it impossible to achieve efficient and continuous production.

[0006] 4. During the grinding process, intense friction causes the temperature inside the grinding chamber to rise rapidly. Traditional stirred mills typically use a single-layer jacket for cooling, resulting in a short flow path for the cooling medium within the jacket, low heat exchange efficiency, and difficulty in effectively controlling the grinding chamber temperature. For heat-sensitive materials, such as pharmaceutical intermediates and lithium battery cathode materials, high temperatures can damage the molecular structure of the material, leading to denaturation and failure, severely affecting product quality. Furthermore, for high-solids slurries, increased temperature alters their viscosity, further deteriorating the mixing and grinding effects. Utility Model Content

[0007] The purpose of this invention is to provide a circulating stirring mill that can achieve one or more of the following technical effects: uniform feeding, efficient stirring and circulation, and precise temperature control, which has important practical significance.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A circulating stirred mill includes a cylinder with a top plate, a feed inlet at the top of the top plate, a discharge pipe at the bottom of the cylinder, and a stirring mechanism inside the cylinder.

[0010] The stirring mechanism includes a motor mounted on the top plate, and also includes a spiral stirring blade, a first stirring assembly, and a second stirring assembly located inside the cylinder. The output end of the motor is connected to a connector. The spiral stirring blades are symmetrically arranged at both ends of the bottom of the connector. The first stirring assembly is located in the middle of the connector. The second stirring assembly is arranged in the stirring blade of the first stirring assembly.

[0011] Furthermore, the bottom of the outer cylinder is provided with several support legs, which are arranged circumferentially at the bottom of the outer cylinder.

[0012] Furthermore, the feed inlet is provided with a cover plate, and the top of the cover plate is provided with a handle.

[0013] Furthermore, the cylinder includes an inner cylinder and an outer cylinder, with a gap between the inner and outer cylinders forming a sandwich layer.

[0014] Furthermore, the cylinder is equipped with a feeding unit;

[0015] The feeding unit includes a spiral feeding pipe and an annular injection pipe located below and communicating with it; the inner wall of the annular injection pipe is provided with several feeding pipes that penetrate and extend to the inner wall of the inner cylinder; the top of the spiral feeding pipe is connected to the discharge pipe at the bottom of the inner cylinder through a connecting pipe.

[0016] Furthermore, a circulation pump is provided between the connecting pipe and the discharge pipe, and a regulating valve is provided on the discharge pipe.

[0017] Furthermore, the upper part of the outer cylinder is provided with a liquid inlet pipe on one side and a liquid outlet pipe on the other side of the bottom; both the liquid inlet pipe and the liquid outlet pipe are provided with regulating valves.

[0018] Furthermore, the connector has an inverted T-shaped structure, and the top of the spiral stirring blade is provided with a mounting lug, which is installed on the bottom of the connector by bolts.

[0019] Furthermore, both the first and second stirring components are composed of a number of stirring blades evenly arranged in the circumferential direction, and a rectangular cavity is opened in the middle of the stirring blades in the second stirring component. A rotating shaft is arranged longitudinally in the rectangular cavity, and the second stirring component is rotatably arranged in the corresponding rectangular cavity through the rotating shaft.

[0020] Furthermore, a mounting rod is provided at the center of the bottom of the connector, and the first stirring assembly is mounted on the mounting rod by a circular mounting kit.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] 1. High-efficiency and uniform feeding: This circulating stirred mill achieves material circulation feeding through a feeding unit in the sandwich between the inner and outer cylinders. A spiral feed pipe, an annular injection pipe, and multiple feed pipes work together to draw material from the bottom of the inner cylinder through a connecting pipe to the spiral feed pipe, and then evenly inject it into the inner cylinder through the feed pipes on the annular injection pipe. The spiral feed pipe inlet is located in the middle of the inner wall of the inner cylinder. Combined with the multiple feed pipes on the annular injection pipe, the material can be dispersed to different positions within the inner cylinder. Compared to traditional feeding methods, the uniformity of material distribution is significantly improved, greatly enhancing the contact efficiency between the grinding media and the material, thereby improving grinding efficiency and product quality. Simultaneously, this feeding method effectively avoids slurry splashing, preventing material loss and scaling within the grinding chamber, and reducing equipment cleaning and maintenance costs.

[0023] 2. Multi-stage High-Efficiency Mixing: The mixing mechanism adopts a three-stage mixing mode consisting of a spiral mixing blade, a first mixing component, and a second mixing component. The motor drives the connecting parts to rotate, and the spiral mixing blade first performs initial mixing and dispersion of the material; the mixing blades of the first mixing component further mix and achieve secondary dispersion; under the synergistic action of the spiral mixing blade and the first mixing component, the second mixing component performs deep mixing and dispersion of the material. This multi-stage mixing structure creates a complex flow field within the grinding chamber, minimizing dead zones and ensuring full contact between the material and the grinding media. Whether it's high-viscosity slurry or ordinary powder, thorough grinding can be achieved. Compared to traditional stirred mills, the material ground by this equipment has a more uniform particle size and significantly improved grinding efficiency, better meeting the needs of refined production.

[0024] 3. Flexible circulation enhances efficiency: A circulation pump installed between the connecting pipe and the discharge pipe allows the slurry to circulate within the grinding chamber. When processing the slurry, the circulation pump is activated, and the slurry passes through the connecting pipe, spiral feed pipe, annular injection pipe, and feed pipe, achieving multiple cycles of grinding. Compared to traditional equipment with no circulation or low circulation efficiency, this allows for more thorough grinding of the slurry, reduces the number of repeated processing steps, improves production efficiency, and reduces energy consumption and costs.

[0025] 4. Dual Cooling for Precise Temperature Control: Cooling medium is delivered to the interlayer between the inner and outer cylinders via the inlet and outlet pipes of the outer cylinder. This cools the slurry within the spiral feed pipe and annular injection pipe, achieving initial cooling. This is particularly suitable for high-solids slurries or those containing grinding beads that easily generate heat. The cooling medium fully exchanges heat with the material within the interlayer, resulting in significant cooling. Simultaneously, the slurry inside the cylinder is also cooled, achieving secondary cooling. This dual cooling mechanism effectively controls the temperature within the grinding chamber, preventing changes in material properties or affecting the grinding and mixing effect due to high temperatures. This is crucial for processing heat-sensitive materials and effectively ensures consistent product quality. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a first-view structural diagram of the present invention;

[0028] Figure 2 This is a schematic diagram of the second-view structure of the present invention;

[0029] Figure 3 This is a partial structural schematic diagram of the present invention;

[0030] Figure 4 This is a partial structural schematic diagram of the present invention.

[0031] The attached diagram lists the components represented by each number as follows:

[0032] 1-Top plate, 2-Outer cylinder, 3-Inner cylinder, 4-Feeding unit, 41-Spiral feed pipe, 42-Annular injection pipe, 43-Feeding pipe, 5-Stirring mechanism, 51-Motor, 52-First stirring assembly, 521-Stirring blade, 53-Second stirring assembly, 54-Connector, 6-Connecting pipe, 7-Support leg, 8-Cover plate, 9-Inlet pipe, 10-Drain pipe, 11-Mounting rod, 12-Circular mounting kit, 13-Circulating pump, 14-Spiral stirring blade, 15-Discharge pipe. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0034] Please see the appendix Figure 1 To be continued Figure 4This utility model provides a circulating stirring mill, including a top plate 1, an outer cylinder 2, an inner cylinder 3, a feeding unit 4, and a stirring mechanism 5; the feeding unit 4 is provided in the interlayer formed by the inner cylinder 3 and the outer cylinder 2, the feeding unit 4 includes a spiral feeding pipe 41 and an annular injection pipe 42 located below and communicating with it; the annular injection pipe 42 is provided with a plurality of feeding pipes 43 that penetrate and extend to the inner wall of the inner cylinder 3, the feeding pipes 43 are threadedly connected to the annular injection pipe 42, and the feeding pipes 43 can be disassembled and installed separately; the top of the spiral feeding pipe 41 is connected to the discharge pipe 15 at the bottom of the inner cylinder 3 through a connecting pipe 6;

[0035] The stirring mechanism 5 includes a motor 51, a spiral stirring blade 14, a first stirring assembly 52, and a second stirring assembly 53; the output end of the motor 51 located at the top of the top plate 1 is connected to a connector 54, the two ends of the bottom of the connector 54 are symmetrically provided with spiral stirring blades 14, and the middle part is provided with the first stirring assembly 52; the middle part of the stirring blade 521 in the first stirring assembly 52 is provided with the second stirring assembly 53.

[0036] The bottom of the outer cylinder 2 is provided with several support legs 7, which are arranged circumferentially at the bottom of the outer cylinder 2. The support legs 7 help to improve the stability of the circulating stirred mill and make it run more smoothly.

[0037] The top plate 1 has a feed inlet, and a cover plate 8 is provided at the feed inlet. The top of the cover plate 8 has a handle. The feed inlet is designed to facilitate feeding.

[0038] The outer cylinder 2 has an inlet pipe 9 on one side of the upper part and an outlet pipe 10 on the other side of the bottom; both the inlet pipe 9 and the outlet pipe 10 are equipped with regulating valves. The cooling medium (water or oil) is transported to the interlayer formed by the inner cylinder 3 and the outer cylinder 2 through the inlet pipe 9, which can simultaneously cool the materials in the spiral feed pipe 41 and the inner cylinder 3, resulting in a better cooling effect.

[0039] The connector 54 has an inverted T-shaped structure, and the top of the spiral stirring blade 14 is provided with mounting lugs, which are bolted to the bottom of the connector 54. The design of the connector 54 and the mounting lugs facilitates the installation and removal of the spiral stirring blade 14.

[0040] Both the first stirring assembly 52 and the second stirring assembly 53 are composed of a number of stirring blades 521 evenly arranged in the circumferential direction. The stirring blades 521 in the second stirring assembly 53 have a rectangular cavity in the middle. A rotating shaft is arranged longitudinally in the rectangular cavity. The second stirring assembly 53 is rotatably arranged in the corresponding rectangular cavity through the rotating shaft.

[0041] A mounting rod 11 is provided at the center of the bottom of the connector 54, and the first stirring assembly 52 is mounted on the mounting rod 11 via a circular mounting kit 12. The circular mounting kit 12 is fixed to the mounting rod 11 by bolts.

[0042] A circulation pump 13 is also provided between the connecting pipe 6 and the discharge pipe 15, and a regulating valve is provided on the discharge pipe 15. The use of the circulation pump 13 and the connecting pipe 6 facilitates the circulation and mixing of the slurry to be ground, thereby improving the efficiency and quality of grinding.

[0043] The outer diameter of the inner cylinder 3 is equal to the inner diameter of the spiral feed pipe 41 and the inner diameter of the annular injection pipe 42. This facilitates the installation and disassembly of the spiral feed pipe 41 and the annular injection pipe 42.

[0044] When using a circulating stirred mill to grind the slurry, it is injected into the inner cylinder 3 through the feed inlet. After injection, the motor 51 is started. Driven by the motor 51, the connecting part 54, the spiral stirring blade 14 at its bottom, the first stirring assembly 52, and the second stirring assembly 53 also rotate. Under the action of the spiral stirring blade 14, the slurry is initially stirred and dispersed. The stirred slurry is then stirred and dispersed by the stirring blades 521 of the first stirring assembly 52, achieving secondary stirring and dispersion of the slurry. With the coordinated action of the spiral stirring blade 14 and the first stirring assembly 52, the slurry in the cylinder is further stirred and dispersed by the stirring blades 521 of the second stirring assembly 53, achieving tertiary stirring and dispersion of the slurry. Finally, through multiple stirring and dispersion actions, the slurry in the cylinder is ground more thoroughly and completely. Furthermore, during the stirring and dispersion process, the circulation pump 13 is activated. Under the action of the circulation pump 13, the slurry in the inner cylinder 3 is transported to the spiral feed pipe 41, then flows through the annular injection pipe 42, and then flows back into the inner cylinder 3 from its feed pipe 43. This cycle is repeated, making the slurry more thoroughly and completely ground. If the material being ground is powder, there is no need to activate the circulation pump 13. The powder is fully ground by the synergistic action of the spiral stirring blades 14, the first stirring component 52, and the second stirring component 53.

[0045] Furthermore, by delivering the cooling medium (water or oil) through the inlet pipe 9 to the interlayer formed by the inner cylinder 3 and the outer cylinder 2, the material in both the spiral feed pipe 41 and the inner cylinder 3 can be cooled simultaneously, achieving primary cooling. This cooling effect is particularly good for high-solids slurries or for situations where grinding beads in the mixing tank easily generate heat. Meanwhile, the slurry inside the cylinder is also cooled simultaneously, achieving secondary cooling of the slurry.

[0046] Furthermore, the slurry flows into the inner cylinder 3 via the spiral feed pipe 41, the annular injection pipe 42, and the feed pipe 43, effectively preventing slurry from splashing into other parts of the inner cylinder 3 and causing scaling or material loss. The inlet of the spiral feed pipe 41 is located in the middle of the inner wall of the inner cylinder 3, and together with the several feed pipes 43 on the annular injection pipe 42, the slurry can be dispersed at different locations simultaneously, which is beneficial for its uniform dispersion.

[0047] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0048] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A circulating stirred mill, comprising a cylinder with a top plate, a feed inlet at the top of the top plate, a discharge pipe at the bottom of the cylinder, and a stirring mechanism inside the cylinder; characterized in that: The stirring mechanism includes a motor mounted on the top plate, and also includes a spiral stirring blade, a first stirring assembly, and a second stirring assembly located inside the cylinder; the output end of the motor is connected to a connector, the spiral stirring blade is symmetrically arranged at both ends of the bottom of the connector, the first stirring assembly is arranged in the middle of the connector, and the second stirring assembly is arranged in the stirring blade of the first stirring assembly; The cylinder includes an inner cylinder and an outer cylinder, with a gap between the inner and outer cylinders forming a sandwich layer; The cylinder is equipped with a feeding unit; The feeding unit includes a spiral feeding pipe and an annular injection pipe located below and communicating with it; the inner wall of the annular injection pipe is provided with several feeding pipes that penetrate and extend to the inner wall of the inner cylinder; the top of the spiral feeding pipe is connected to the discharge pipe at the bottom of the inner cylinder through a connecting pipe. The connector has an inverted T-shaped structure, and the top of the spiral stirring blade is provided with a mounting lug. The mounting lug is installed at the bottom of the connector by bolts. The middle of the bottom of the connector is provided with a mounting rod. The first stirring assembly is installed on the mounting rod by a circular mounting kit.

2. The circulating stirred mill according to claim 1, characterized in that: The bottom of the outer cylinder is provided with several support legs, which are arranged circumferentially at the bottom of the outer cylinder.

3. The circulating stirred mill according to claim 1, characterized in that: The feed inlet is provided with a cover plate, and the top of the cover plate is provided with a handle.

4. The circulating stirred mill according to claim 1, characterized in that: A circulation pump is also provided between the connecting pipe and the discharge pipe, and a regulating valve is provided on the discharge pipe.

5. A circulating stirred mill according to claim 1, characterized in that: The upper part of the outer cylinder is provided with a liquid inlet pipe on one side and a liquid outlet pipe on the other side of the bottom; both the liquid inlet pipe and the liquid outlet pipe are provided with regulating valves.

6. A circulating stirred mill according to claim 1, characterized in that: Both the first and second stirring components are composed of a number of stirring blades evenly arranged in the circumference. The stirring blades in the second stirring component have a rectangular cavity in the middle. A rotating shaft is arranged longitudinally in the rectangular cavity. The second stirring component is rotatably arranged in the corresponding rectangular cavity through the rotating shaft.

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