Rotary stirring superfine mill

Abstract

The utility model provides a rotary stirring superfine mill which is composed of a rotary cylinder assembly and a stirring shaft assembly, and the stirring shaft assembly is arranged in the rotary cylinder assembly. The rotary cylinder assembly comprises a rotary cylinder, a feeder and a feeding screw; wherein the stirring shaft assembly is located in the rotary cylinder body, a plurality of discharging holes are formed in the tail end of the rotary cylinder body, the feeder, the feeding screw and the material guiding cone are sequentially installed at the front end of the rotary cylinder body, materials enter the feeding screw cylinder through a discharging pipe on the feeder and enter the rotary cylinder body through the material guiding cone, and the stirring shaft assembly is located in the rotary cylinder body. At the tail part of the rotary cylinder body, the materials fall into a discharging ventilation lower shell through a discharging hole and are discharged; the stirring shaft coupler is connected with the output end of the permanent magnetic direct-drive motor. According to the utility model, materials which need to be subjected to superfine grinding in the rotary cylinder are subjected to grinding, rubbing, shearing and extruding, so that the materials are subjected to superfine grinding; the superfine grinding effect is guaranteed, and the problem of material flowing is solved.

Description

Technical Field

[0001] This invention relates to the field of stirring and grinding, and more particularly to a rotary stirring ultrafine mill. Background Technology

[0002] A ball mill is a high-grinding-ratio grinding equipment. It consists of a tubular cylinder filled with steel balls, which rotates under the drive of a motor. The material is ground finely through a combination of grinding mechanisms, including impact, grinding, and extrusion, by the steel balls. To improve grinding efficiency, the mill speed is typically 70-80% of the critical speed. At this speed, the steel balls are lifted to a certain height by the mill cylinder and then fall freely. The upper layer of the steel balls experiences impact, while the lower layer experiences rolling and grinding—a state where multiple grinding mechanisms coexist.

[0003] Larger steel balls result in higher mill speeds, greater impact force, and weaker grinding effect, as seen in the first chamber of a multi-chamber mill. Conversely, smaller steel balls result in lower mill speeds, less impact force, and stronger grinding effect, as seen in the tail chamber of a multi-chamber mill. A lower mill filling rate leads to a higher proportion of impact force and a lower proportion of grinding force, while a higher filling rate leads to a lower proportion of impact force and a higher proportion of grinding force. When the grinding media filling rate is high, the free fall height is small, resulting in a low final impact velocity and thus a decrease in impact grinding force. Most of the steel balls then fall in the lower layers, enhancing the grinding effect.

[0004] Ball mills are primarily impact mills, generating significant noise and heat during operation, reflecting the excess energy required for impact grinding. Therefore, ball mills are cooled via ventilation during operation, and for mills that generate particularly high heat or for materials with high heat sensitivity, water spray cooling is used on the mill cylinder.

[0005] Ball mills are highly reliable, adaptable to different materials, and can be scaled up to handle large volumes, making them the mainstream mills in the market. However, the ball loading capacity of ball mills can only reach 25-30%, resulting in low weight and volume utilization. This makes ball mills bulky, large in size, and require high investment and energy consumption.

[0006] A stirred mill is a cylindrical container filled with numerous small grinding media. An agitator generates centrifugal and rotational forces within the grinding media, causing them to rotate. This motion pulverizes the material within the grinding media, achieving highly efficient grinding. The grinding process relies on shearing, compression, friction, or a combination thereof. In particular, the combined action of shearing and friction can very effectively pulverize materials into ultrafine powder. It features high grinding capacity, high energy utilization, and the potential to produce products with a narrow particle size distribution.

[0007] The key characteristic of a stirred mill is its high energy density, 10-20 times higher than that of a ball mill, resulting in a very compact design. The agitator discs on the shaft achieve a tip velocity of approximately 5 m / s, generating a constant ring of grinding media. Furthermore, the high energy density within the grinding chamber necessitates rapid material transport, thus requiring high suction to force the product through the mill. The grinding media is another crucial factor; different industries and desired fineness require different materials and diameters of grinding media. Grinding media include steel balls, ceramics, glass, and other ultra-hard materials.

[0008] Among conventional grinding equipment, roller presses have the lowest energy consumption, ball mills the highest, and vertical mills are next. However, roller presses lack fine grinding capacity, have an unreasonable particle size distribution curve, and produce particles with insufficiently smooth surfaces and round shapes. For ultrafine grinding, ball mills are superior to roller presses and vertical mills, but their energy consumption is too high. How to ensure ultrafine grinding efficiency while maintaining low energy consumption is a problem we need to consider. Stirred mills can meet the requirements of ultrafine grinding. Conventional stirred mills have a fixed cylinder, which leads to slow material flow, especially for materials with poor flowability, requiring high-suction air to carry the material away. To ensure ultrafine grinding efficiency while improving material flow, the existing stirred mill structure needs improvement. Rotating the fixed cylinder increases the material's movement speed within the rotating cylinder, making flow and transport easier. Based on in-depth research on stirred mills and ball mills, we have developed a rotary stirred ultrafine mill. Summary of the Invention

[0009] To address the aforementioned problems, this invention discloses a rotary stirring ultrafine mill that uses grinding, kneading, shearing, and extrusion to grind materials requiring ultrafine grinding within a rotary cylinder; it aims to both ensure the ultrafine grinding effect and improve material flow.

[0010] A rotary stirring ultrafine mill comprises a rotary cylinder assembly and a stirring shaft assembly. The rotary cylinder assembly is mounted on a support base, and the stirring shaft assembly is disposed within the rotary cylinder assembly. The rotary cylinder assembly includes a rotary cylinder, a feeder, and a feed screw. The stirring shaft assembly is located within the rotary cylinder. Several discharge holes are opened at the rear end of the rotary cylinder, and a feeder, a feed screw, and a guide cone are sequentially installed at the front end. Material enters the feed screw cylinder through the discharge pipe on the feeder and passes through the guide cone. The material enters the rotary cylinder and falls through the discharge hole at the tail of the rotary cylinder into the discharge ventilation lower shell for discharge. The stirring assembly consists of stirring bearing seat one, stirring shaft, stirring bearing seat two, stirring coupling, and permanent magnet direct drive motor. One end of the stirring shaft is connected to stirring bearing seat one and the other end is connected to stirring bearing seat two, and is connected to the output end of the permanent magnet direct drive motor through the stirring coupling. Several stirring discs one and two are alternately arranged on the stirring shaft. The inner cavity of the rotary cylinder is filled with several small micro-grinding media.

[0011] Furthermore, one end of the bottom of the rotary drum is mounted on the front support roller assembly and the rear end is mounted on the support roller and stop roller assembly.

[0012] Furthermore, the front-end support roller assembly includes a front-end support roller, a front-end bearing seat, a front-end support roller assembly base, and a front-end support roller shaft; wherein the front-end support roller assembly base is fixed on the support base; front-end bearing seats are symmetrically arranged on the front-end support roller assembly base; each of the front-end bearing seats is provided with a front-end support roller; a front-end support wheel belt sleeve is connected to the front end face of the rotary cylinder, and a front-end wheel belt is installed on the front-end support wheel belt sleeve, the front-end wheel belt being adapted to the front-end support roller.

[0013] Furthermore, the support roller and stop roller assembly includes a support roller and stop roller assembly base, a cycloidal pinwheel reducer motor, a transmission support roller coupling, a support roller bearing seat, a transmission support roller shaft, a transmission support roller, and a stop roller assembly; the support roller and stop roller assembly base is fixed on the support base; each of the support roller and stop roller assembly bases is equipped with a cycloidal pinwheel reducer motor; the transmission support roller is mounted on the transmission support roller shaft; both ends of the transmission support roller shaft are respectively mounted on the support roller bearing seat; one end of the cycloidal pinwheel reducer motor is connected to one end of the transmission support roller shaft through the transmission support roller coupling; the cylinder tire and the transmission support roller are mutually adapted; and stop roller assemblies are provided on both the front and rear ends of the cylinder tire.

[0014] Furthermore, mixing disc one and mixing disc two are installed close together, with mixing disc one and mixing disc two installed at a 90° angle offset.

[0015] Furthermore, the filling rate of micro-abrasive media in the rotary cylinder can reach 40-60%.

[0016] Furthermore, the centers of the two front support rollers and the center of the front support roller sleeve form a 60-degree angle support structure. When viewed from the center line of the cylinder, the three points—the centers of the two front support rollers and the center of the front support roller sleeve above—form an isosceles triangle.

[0017] Furthermore, the upper casing of the discharge ventilation system is symmetrically arranged on the rotary cylinder and the lower casing of the discharge ventilation system.

[0018] Furthermore, the rotary cylinder is composed of end face liner, cylinder liner and grinding grate, and the tail end face of the rotary cylinder is sealed by the tail end face sealing plate.

[0019] The working principle of this invention is:

[0020] 1. The rotary stirring ultrafine mill consists of a rotary cylinder assembly and a stirring shaft assembly. The rotary cylinder assembly is mounted on two pairs of tires, and the front tire is mounted on the front support roller assembly. The centers of the two support rollers and the center of the tire on the front support tire sleeve form a 60-degree isosceles triangle support structure.

[0021] 2. A tire is installed on the rotating drum, supported by a rear-end support roller assembly. This assembly includes not only a pair of supporting rollers but also a pair of retaining rollers to prevent the tire from shifting axially. A cycloidal pinwheel reducer motor is installed at one end of the support roller shaft to drive the support roller to rotate. The surface of the support roller relies on friction with the tire to rotate the tire, thereby driving the drum to rotate.

[0022] 3. A permanent magnet direct-drive motor directly drives the stirring shaft to rotate, agitating the small grinding media inside the rotary drum. This achieves grinding, kneading, shearing, and extrusion of the materials requiring ultrafine grinding within the rotary drum, thus achieving ultrafine grinding. A feeder and feed screw are installed at the front end of the rotary drum to ensure smooth entry of materials into the grinding drum.

[0023] 4. Several discharge holes are opened at the tail end of the rotary drum. The material enters the lower discharge ventilation shell through the discharge holes and is discharged at the discharge port. The upper discharge ventilation shell is used for dust removal and ventilation inside the mill.

[0024] 5. The material enters through the feed pipe of the feeder and falls into the feed screw. The feed screw is installed in the front support wheel sleeve and is installed together with the rotary cylinder. As the cylinder rotates, it feeds the material into the guide cone, which then feeds the material into the grinding cylinder. The grinding cylinder is loaded with a large amount of small grinding media, with a filling rate of 40-60%. Driven by the stirring shaft and the rotary cylinder, the small grinding media and the material undergo grinding, kneading, shearing, and extrusion, grinding the material into the required ultrafine powder. The fine powder passes through the grinding grate at the tail of the rotary cylinder and enters the discharge hole at the tail of the cylinder, from where it falls into the discharge ventilation lower shell and is discharged through the discharge port.

[0025] 6. While the stirring shaft drives the stirring disc to agitate, the cylinder also rotates under the drive of the transmission roller, which also drives the effective movement of the micro-grinding media. The rotation direction of the rotary cylinder can be consistent with the rotation direction of the stirring shaft according to the needs of material grinding, but the two can have different speeds or opposite directions, which can intensify the agitation effect on the micro-grinding media.

[0026] 7. During the grinding process, a certain amount of gas needs to enter the mill. The gas enters the mill cylinder through the air inlet of the feeder, then enters the discharge ventilation upper shell through the grinding grate, and is discharged through the dust exhaust outlet on top, entering the subsequent dust removal equipment.

[0027] The beneficial effects of this invention are:

[0028] 1. The rotary stirred ultrafine mill changes the traditional fixed-cylinder structure of the stirred mill, adopting a rotary cylinder structure, which is conducive to the flow of fine powder materials, especially for fibrous fine powder particles with poor flowability. This allows the material to flow across the entire end face of the cylinder during the grinding process, further facilitated by the gas flow. This structure also enhances the agitation of the micro-grinding media, significantly improving the grinding efficiency of the micro-grinding media. Compared to a fixed-cylinder stirred mill, it has lower energy consumption. Furthermore, since the rotation of both the rotary cylinder and the stirring shaft is frequency-controlled, the direction and speed can be changed, allowing for various combinations and making production planning more convenient and efficient based on the grinding conditions and requirements of the materials.

[0029] 2. Based on computer simulation and calculation of rotary stirring ultrafine mill, it has higher grinding efficiency and a wider range of applications for ultrafine powders with high specific surface area. Attached Figure Description

[0030] Figure 1 Axonometric drawing of rotary stirring ultrafine mill

[0031] Figure 2 Cross-sectional view of a rotary stirring ultrafine mill;

[0032] Figure 3 Schematic diagram of the installation position of the wheel chock

[0033] Figure 4 Schematic diagram of roller installation

[0034] Figure 5 Installation diagram of the mixing tray

[0035] Figure 6 Axonometric drawing of the front support roller assembly;

[0036] Figure 7 Front view of the front support roller assembly;

[0037] Figure 8 for Figure 7 Top view;

[0038] Figure 9 for Figure 7 The right view;

[0039] Figure 10 Axonometric drawing of the support roller and guide roller assembly;

[0040] Figure 11 Front view of the roller and support roller assembly;

[0041] Figure 12 for Figure 11 Right view

[0042] Figure 13 for Figure 11 Top view.

[0043] Figure 14 Top view of the material feeding structure at the tail of the rotary drum.

[0044] List of reference numerals in the attached diagram:

[0045] 1-Support base; 2-Feeder base; 3-Front-end support roller assembly; 4-Agitator bearing seat 1; 5-Agitator shaft; 6-Feeder; 7-Feeding auger; 8-Front-end support wheel sleeve; 9-Front-end wheel tire; 10-Guide cone; 11-End face liner; 12-Cylinder liner; 13-Agitator disc 1 14-Agitator plate II; 15-Cylinder tire; 16-Grinding grate; 17-Discharge ventilation upper shell; 18-Agitator bearing seat II; 19-Agitator coupling; 20-Permanent magnet direct drive motor; 21-Tail end face sealing plate; 22-Support roller and chock assembly; 23-Discharge ventilation lower shell; 3-1-Front-end support roller; 3-2-Front-end bearing seat; 3-3-Front-end support roller assembly base; 3-4-Front-end support roller shaft; 22-1-Support roller and chock assembly base; 22-2-Cycloidal pinwheel reducer motor; 22-3-Transmission support roller coupling; 22-4-Support roller bearing seat; 22-5-Transmission support roller shaft; 22-6-Transmission support roller; 22-7-Chock wheel assembly; 24-Rotating cylinder. Detailed Implementation

[0046] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, and the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0047] like Figure 1-5 As shown, a rotary stirring ultrafine mill of this embodiment is composed of a rotary cylinder assembly and a stirring shaft assembly. The rotary cylinder assembly is mounted on a support base 1, and the stirring shaft assembly is disposed inside the rotary cylinder assembly. The rotary cylinder assembly includes a rotary cylinder 24, a feeder 6 and a feed screw 7, a front support wheel with a sleeve, and a guide cone. The bottom of the feeder 6 is connected to the feeder base 2.

[0048] The stirring shaft assembly is located inside the rotary cylinder 24. Several discharge holes are opened at the tail end of the rotary cylinder 24, and a feeder 6, a feed spiral 7, a guide cone 10, a front support wheel with a sleeve, and a guide cone are installed sequentially at the front end. The stirring assembly consists of a stirring bearing seat 4, a stirring shaft 5, a stirring bearing seat 18, a stirring coupling 19, and a permanent magnet direct drive motor 20. One end of the stirring shaft 5 is connected to the stirring bearing seat 4 and the other end is connected to the stirring bearing seat 18, and is connected to the output end of the permanent magnet direct drive motor 20 through the stirring coupling 19. Several stirring discs 13 and 24 are alternately arranged on the stirring shaft 5. Several small grinding media are loaded in the inner cavity of the rotary cylinder 24. The upper discharge ventilation housing 17 is located above the rotary cylinder 24, and the lower discharge ventilation housing 23 is located below the rotary cylinder. The upper discharge ventilation housing 17 and the lower discharge ventilation housing 23 are connected vertically and are concentric with the center of the rotary cylinder 24. The rotary cylinder 24 is composed of an end face liner 11, a cylinder liner 12, and a grinding grate 16. The tail end face of the rotary cylinder 24 is sealed by a tail end face sealing plate 21.

[0049] like Figure 6-13As shown, one end of the bottom of the rotary cylinder 24 is mounted on the front support roller assembly 3 and the rear end is mounted on the support roller and stop roller assembly 22; the front support roller assembly 3 includes a front support roller 3-1, a front bearing seat 3-2, a front support roller assembly base 3-3, and a front support roller shaft 3-4; the front support roller assembly base 3-3 is fixed on the support base 1; the front bearing seats 3-2 are symmetrically arranged on the front support roller assembly base 3-3; each of the front bearing seats 3-2 is provided with a front support roller 3-1; the front end of the rotary cylinder 24 is connected to the front support wheel belt sleeve 8, and the outer surface of the front support wheel belt sleeve 8 is fitted with a front wheel belt 9; the front wheel belt 9 is adapted to the front support roller 3-1. The roller support assembly 22 includes a roller support assembly base 22-1, a cycloidal pinwheel reducer motor 22-2, a transmission roller coupling 22-3, a roller bearing seat 22-4, a transmission roller shaft 22-5, a transmission roller 22-6, and a roller stop assembly 22-7; the rear end of the rotating cylinder 24 is fitted with a tire 15; two symmetrically arranged roller support assembly bases 22-1 are fixed on the support base 1; each of the roller support assembly bases 22-1 is provided with There is a cycloidal pinwheel reducer motor 22-2; a transmission roller 22-6 is mounted on the transmission roller shaft 22-5; both ends of the transmission roller shaft 22-5 are respectively mounted on the roller bearing seats 22-4; one end of the cycloidal pinwheel reducer motor 22-2 is connected to one end of the transmission roller shaft 22-5 through the transmission roller coupling 22-3; the cylindrical tire 15 is adapted to the transmission roller 22-6; and the front and rear ends of the cylindrical tire 15 are provided with a stop roller assembly 22-7.

[0050] The mixing disc 13 and the mixing disc 2 14 are installed close together, and the mixing disc 13 and the mixing disc 2 14 are installed at a 90° angle offset.

[0051] The centers of the two front support rollers 3-1 and the center of the front support roller sleeve form a 60-degree angle support structure. When viewed from the center line of the cylinder, the centers of the two front support rollers and the center of the front support roller sleeve above form an isosceles triangle.

[0052] The technical means disclosed in this invention are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features.

Claims

1. A rotary stirring ultrafine mill, characterized in that: It consists of a rotary cylinder assembly and a stirring shaft assembly, wherein the rotary cylinder assembly is mounted on a support base (1), and the stirring shaft assembly is located inside the rotary cylinder assembly; the rotary cylinder assembly includes a rotary cylinder (24), a feeder (6), and a feed screw (7); wherein the stirring shaft assembly is located inside the rotary cylinder (24), and several discharge holes are opened at the tail end of the rotary cylinder (24), and the feeder (6), the feed screw (7), and the guide cone (10) are installed sequentially at the front end, wherein the material enters the discharge ventilation lower shell (23) through the discharge holes; the stirring shaft assembly is located inside the rotary cylinder (24). The mixing assembly consists of a mixing bearing housing 1 (4), a mixing shaft (5), a mixing bearing housing 2 (18), a mixing coupling (19), and a permanent magnet direct drive motor (20); one end of the mixing shaft (5) is connected to the mixing bearing housing 1 (4) and the other end is connected to the mixing bearing housing 2 (18), and is connected to the output end of the permanent magnet direct drive motor (20) through the mixing coupling (19); several mixing discs 1 (13) and mixing discs 2 (14) are alternately arranged on the mixing shaft (5); the inner cavity of the rotary cylinder (24) is filled with several small grinding media.

2. The rotary stirring ultrafine mill according to claim 1, characterized in that: The bottom end of the rotary cylinder (24) is mounted on the front support roller assembly (3) and the rear end is mounted on the support roller stop assembly (22).

3. The rotary stirring ultrafine mill according to claim 2, characterized in that: The front-end support roller assembly (3) includes a front-end support roller (3-1), a front-end bearing seat (3-2), a front-end support roller assembly base (3-3), and a front-end support roller shaft (3-4); wherein the front-end support roller assembly base (3-3) is fixed on the support base (1); the front-end bearing seats (3-2) are symmetrically arranged on the front-end support roller assembly base (3-3); each of the front-end bearing seats (3-2) is provided with a front-end support roller (3-1); the front end face of the rotary cylinder (24) is connected to a front-end support wheel belt sleeve (8), and a front-end wheel belt (9) is installed on the front-end support wheel belt sleeve, and the front-end wheel belt (9) is adapted to the front-end support roller (3-1).

4. The rotary stirring ultrafine mill according to claim 2, characterized in that: The roller support assembly (22) includes a roller support assembly base (22-1), a cycloidal pinwheel reducer motor (22-2), a transmission roller coupling (22-3), a roller bearing seat (22-4), a transmission roller shaft (22-5), a transmission roller (22-6), and a roller support assembly (22-7); the symmetrically arranged roller support assembly bases (22-1) are fixed on the support base (1); wherein each of the roller support assembly bases (22-1) is provided with a cycloidal pinwheel reducer motor (22-2). -2); the transmission roller (22-6) is set on the transmission roller shaft (22-5); both ends of the transmission roller shaft (22-5) are respectively set on the roller bearing seat (22-4); one end of the cycloidal pinwheel reducer motor (22-2) is connected to one end of the transmission roller shaft (22-5) through the transmission roller coupling (22-3); the cylindrical tire (15) is adapted to the two transmission rollers (22-6); the front and rear ends of the cylindrical tire (15) are provided with the stop roller assembly (22-7).

5. The rotary stirring ultrafine mill according to claim 1, characterized in that: The first mixing plate (13) and the second mixing plate (14) are installed close together, and the first mixing plate (13) and the second mixing plate (14) are installed at a 90° angle offset.

6. The rotary stirring ultrafine mill according to claim 1, characterized in that: The filling rate of micro-abrasive media in the rotary cylinder is generally 40-60%.

7. The rotary stirring ultrafine mill according to claim 1, characterized in that: The centers of the two front support rollers (3-1) and the center of the front support roller sleeve form a 60-degree angle support structure. When viewed from the center line of the cylinder, the centers of the two front support rollers and the center of the front support roller sleeve above form an isosceles triangle.

8. The rotary stirring ultrafine mill according to claim 1, characterized in that: The upper discharge ventilation shell (17) is located above the rotary cylinder (24), and the lower discharge ventilation shell (23) is located below the rotary cylinder (24). After the upper discharge ventilation shell (17) and the lower discharge ventilation shell (23) are connected, they are concentric with the center of the rotary cylinder (24) and are adapted to each other.

9. A rotary stirring ultrafine mill according to claim 1, characterized in that: The rotary cylinder (24) is composed of end face liner (11), cylinder liner (12) and grinding grate (16). The tail end face of the rotary cylinder (24) is sealed by the tail end face sealing plate (21).

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