A fluidized dry stirred mill

Abstract

The present invention discloses a fluidized dry-process stirring mill, comprising a mill outer shell, a grinding cylinder, a feed port, a discharge port, a mill air inlet, a mill air outlet, a stirring shaft, an agitator, a driving device, a cooling device, an annular sorting chamber, and a homogenizing air supply chamber; the grinding cylinder is coaxially arranged inside the mill outer shell; the diameter of the grinding cylinder gradually increases from the feed end to the discharge end, and the diameter of the agitator gradually increases from the feed end to the discharge end; an annular sorting chamber is formed between the grinding cylinder and the mill outer shell, and the cross-sectional area of the annular sorting chamber decreases from large to small along the direction from the feed end to the discharge end; sorting holes are respectively provided on the side wall of the grinding cylinder corresponding to the annular sorting chamber area and the end cover of the grinding cylinder discharge end; a homogenizing air supply chamber is provided directly below the annular sorting chamber, and the range of the homogenizing air supply chamber corresponds to the fluidized air hole area directly below the grinding cylinder. The present invention can improve the rationality of material movement in a horizontal dry-process stirring mill, flexibly control the fineness of the milled product, avoid the occurrence of grinding blind areas, and improve the heat dissipation effect of the equipment.

Description

Technical Field

[0001] The invention relates to the technical field of stirred mills, in particular to a fluidized dry stirred mill. Background Art

[0002] A stirred mill is a type of fine grinding equipment widely used in the mining, pigment, chemical, building materials, and pharmaceutical industries. It consists of a drive unit, a drum, agitator shaft, agitator, and grinding media. The drum is typically cylindrical, and the agitator is typically of three types: spiral, pin, or disc. The grinding media are typically spherical media such as steel balls, corundum balls, zirconium balls, or natural river sand or pebbles. During operation, the drum of the stirred mill is stationary, while the drive unit drives the agitator shaft, which rotates the agitator. The agitator applies power directly to the grinding media, causing the grinding media and the material to undergo multi-dimensional circular motion and rotation, creating a velocity gradient within the drum. Effective grinding of the material is achieved through extrusion between the grinding media, a small amount of impact, friction, and shear forces. Particle pulverization is primarily achieved through friction. Extrusion and impact forces primarily affect the initial pulverization of particles, while friction and shear determine the efficiency of fine grinding. Therefore, increasing friction and shear between the grinding media can effectively improve fine grinding efficiency. According to the grinding environment, stirred mills can be divided into dry and wet methods; according to the structural form, stirred mills can be divided into horizontal and vertical types.

[0003] At present, wet stirred mills have been scaled up and widely used. Horizontal dry stirred mills are relatively small in size and are in the stage of gradual promotion and application. However, the following problems exist in their application:

[0004] (1) In the existing horizontal dry stirred mill, the material in the mill moves only by its own fluidity. The fineness of the material in different grinding stages is different, and the fluidity is different. Due to the lack of targeted material guiding measures, its flow state lacks regular guidance;

[0005] (2) The existing horizontal dry stirring mill lacks effective control measures for the fineness of the milled material. The fineness control of the milled material is not flexible enough. At the same time, qualified products cannot be discharged in time, resulting in serious over-grinding of local materials, reducing the stability of the equipment and limiting the large-scale equipment.

[0006] (3) In the existing horizontal dry stirring mill, the material is easily deposited at the bottom and is difficult to be ground, forming a grinding blind area, resulting in a decrease in grinding efficiency;

[0007] (4) The existing horizontal dry stirring mill generates a large amount of heat during the grinding process, which poses safety hazards such as high temperature burns and dust explosions, and lacks effective heat dissipation measures. Summary of the Invention

[0008] In order to solve the problems of the existing horizontal dry stirred mill, such as lack of guidance of material flow state, inflexible control of discharge fineness, occurrence of grinding blind spots, and difficulty in equipment heat dissipation, the present invention provides a fluidized dry stirred mill, which can improve the rationality of material movement in the horizontal dry stirred mill, flexibly control the fineness of the discharged product, avoid the occurrence of grinding blind spots, and improve the heat dissipation effect of the equipment.

[0009] The present invention is achieved as follows: a fluidized dry stirring mill includes a mill outer shell, a grinding cylinder, a feeding port, a discharging port, a mill air inlet, a mill air outlet, a stirring shaft, a stirrer, a driving device, a cooling device, an annular sorting chamber and a homogenizing air supply chamber;

[0010] The outer shell of the mill is supported and fixed by a foundation and a bracket. A feed port and a mill air inlet are provided at one end of the outer shell of the mill, and a discharge port and a mill air outlet are provided at the other end. The grinding drum is arranged inside the outer shell of the mill and is coaxially arranged. The feeding end of the grinding drum is connected and fixed to the outer shell of the mill, and the grinding drum is communicated with the feed port. The grinding drum is filled with grinding media. One end of the stirring shaft is connected to the driving device, and the other end passes through the outer shell of the mill and the grinding drum along the axis and is supported by a bearing installed on the foundation and the bracket. An agitator is provided on the stirring shaft located in the grinding drum. A cooling device is provided on the periphery of the outer shell of the mill.

[0011] The grinding cylinder is tapered as a whole, and the diameter of the grinding cylinder gradually increases from the feeding end to the discharging end. Correspondingly, the diameter of the agitator gradually increases from the feeding end to the discharging end, and the distance between two adjacent agitators continues to increase;

[0012] An annular sorting chamber is formed between the grinding cylinder and the outer shell of the mill. The cross-sectional area of the annular sorting chamber decreases from large to small along the direction from the feeding end to the discharging end. The annular sorting chamber is connected to the air inlet of the mill. The side wall of the grinding cylinder is provided with sorting holes in the area corresponding to the annular sorting chamber and on the end cover of the grinding cylinder discharging end.

[0013] A homogenizing air supply chamber is arranged directly below the annular sorting chamber. The range of the homogenizing air supply chamber corresponds to the fluidizing air hole area directly below the grinding cylinder. The central angles of the two corresponding to each other on the cross section of the grinding cylinder are the same. The homogenizing air supply chamber is separated from the annular sorting chamber by a partition in the circumferential direction. In the homogenizing air supply chamber, a graded air supply port is arranged at the bottom of the mill outer shell, a homogenizing air plate is arranged between the mill outer shell and the grinding cylinder, homogenizing air holes are arranged on the homogenizing air plate, and a layer of homogenizing balls is arranged between the homogenizing air plate and the mill outer shell.

[0014] The grinding drum is filled with grinding media. A drive unit rotates the agitator shaft, which in turn rotates the agitator mounted on it. The material is fed into the grinding drum through an air-locked feeder located above one end of the outer shell. The high-speed rotation and stirring of the agitator cause the material to undergo multi-dimensional circular motion and rotation. The material particles are broken down by the grinding media, primarily through friction and shear forces. The spacing between adjacent agitators increases from the feed end to the discharge end, and the overall grinding drum has a tapered shape, facilitating smooth material movement. Simultaneously, the graded air inlets in the homogenizing air supply chamber introduce cool air from bottom to top, passing through the air holes in the fluidizing air hole area below the grinding drum and into the grinding drum. This upward airflow fluidizes the material, resulting in a more uniform movement within the grinding drum and more complete contact with the grinding media. Furthermore, the particles are graded by gravity and the upward airflow, with fine particles gradually moving upward. Cold air drawn into the mill's air inlet enters the annular separation chamber between the grinding drum and the mill's outer shell. The airflow within this chamber creates negative pressure, forcing fine particles to pass through the separation holes in the grinding drum's sidewalls, upper wall, and end. Because the chamber's cross-sectional area gradually decreases from the feed end to the discharge end, the flow field within it exhibits a gradient along this direction, and the negative pressure suction also increases accordingly. The fine particles within the grinding drum also increase in this direction, further facilitating their timely discharge. Qualified fine particles entering the annular separation chamber are driven by wind to the discharge end, where they are discharged through the discharge port and then out through the mill's air outlet. This incoming cold air also continuously removes heat, ensuring consistent cooling during long-term operation.

[0015] Preferably, the diameter of the grinding cylinder is between 0.65 and 0.95 times the diameter of the mill shell, and the length is 0.8 to 0.95 times the length of the mill shell. The diameter of the feeding end of the grinding cylinder is smaller than the diameter of the discharging end. The inclination angle is 2° to 10°. The grinding cylinder is filled with 2 to 10 mm spherical grinding media, and the grinding media filling rate is 50% to 90%.

[0016] The diameter of the air supply holes in the fluidizing air hole area is 0.1 to 0.5 times the diameter of the grinding medium, and the central angle of the area where the air supply holes are opened on the cylinder cross section is 20° to 70°; the side wall of the grinding cylinder is evenly provided with long strip sorting holes in the corresponding annular sorting chamber area, and the width of the long strip sorting holes is 0.2 to 0.7 times the diameter of the grinding medium, and the central angle of the area where the long strip sorting holes are opened on the cylinder cross section is 90° to 270°; the end cover of the cylinder close to the discharge end is conical with a cone angle of 90° to 170°, and arc-shaped sorting holes are evenly provided on the end cover, and the width of the arc-shaped sorting holes is 0.2 to 0.7 times the diameter of the grinding medium.

[0017] Preferably, the diameter of the homogenizing air hole is 1 to 3 times the diameter of the grinding medium, the diameter of the homogenizing ball is 1.5 to 2 times the diameter of the homogenizing air hole, and the filling rate of the homogenizing ball is 30% to 50%.

[0018] Preferably, the mill air inlet is arranged at the end cover on one side of the mill outer shell, including a mill air inlet chamber. The mill air inlet chamber is in a circular shape, and multiple air inlets are evenly arranged around the mill air inlet chamber. Multiple air inlets can ensure uniform air intake. The air inlet is connected to an air supply device to supply air to the mill air inlet chamber; the mill air inlet chamber is connected to the annular sorting chamber to supply cold air to the annular sorting chamber.

[0019] Preferably, the mill air outlet is arranged at the upper part of the end cover on the discharge side of the mill outer shell, the mill air outlet is arranged horizontally, and the mill air outlet is connected to the dust collecting equipment downstream.

[0020] Preferably, the feeding port is arranged just above the center of one end of the cylinder of the mill outer shell, and an air-locking feeding device is provided at the feeding port, and the air-locking feeding device is connected to the grinding cylinder so that the material falls vertically into the grinding cylinder; the air-locking feeding device includes a feeder outer shell, a feeder inner shell, an air-locking plate and a weight, and the lower part of the feeder inner shell extends into the feeder outer shell, and the air-locking plate is placed in the feeder outer shell and below the feeder inner shell. The air-locking plate is fixedly connected to the weight and is installed on the feeder outer shell through a rotating shaft, so that when no material passes through, the air-locking plate fits with the bottom end surface of the feeder inner shell under the action of the weight, blocking the feeding channel; when material passes through, the weight of the material separates the air-locking plate from the bottom end surface of the feeder inner shell, opens the feeding channel, and allows the material to pass smoothly.

[0021] Preferably, the discharge port is arranged at the bottom of the outer shell of the mill.

[0022] Preferably, the outer shell of the mill consists of a cylinder and end covers at both ends, and the end covers are connected to the cylinder by bolts; the cylinder and the end covers are both split structures, each of which can be divided into multiple parts, and the parts are connected and combined by bolts; the ratio of the length to the diameter of the outer shell of the mill is 1.5 to 8, and the outer shell of the mill is arranged horizontally.

[0023] Preferably, the agitator is a disc structure, and the distance between the outer edge of the agitator and the inner wall of the grinding cylinder is 2 to 10 times the diameter of the grinding medium; a plurality of through holes are evenly arranged on the disk surface of the agitator along the circumferential direction, and the total through area on the disk surface accounts for 0.2 to 0.6.

[0024] Preferably, the cooling device includes a cooling shell and heat sinks, a sandwich is formed between the cooling shell and the outer shell of the mill, and multiple groups of heat sinks are fixed on the outer wall of the outer shell of the mill in the sandwich; multiple groups of heat sinks are also provided on the outer surface of the cooling shell; a cooling medium inlet is provided at the lower part of the cooling shell located on the discharge end side, and a cooling medium outlet is provided at the upper part of the cooling shell located on the feed end side, and the cooling medium flows in the sandwich; the cooling device is a split structure corresponding to the cylinder of the outer shell of the mill.

[0025] Preferably, the driving device is arranged at one end of the feeding side of the mill shell, and adopts a permanent magnet direct drive or a motor acceleration and reduction gear drive mode.

[0026] The present invention has the following advantages and beneficial effects:

[0027] 1) The grinding cylinder of the present invention is arranged inside the outer shell of the mill, fixed to the outer shell of the mill and fixed by the foundation and bracket support. The grinding cylinder is tapered as a whole, and the material flow is smoother. A fluidized air hole area is arranged just below the grinding cylinder, which is connected to the homogenization air supply chamber to provide an upward airflow for the material in the mill, so that the material is fluidized and the grinding blind area is avoided; at the same time, coarse and fine classification is achieved, and the side wall of the grinding cylinder is evenly provided with long strip sorting holes in the corresponding annular sorting chamber area. Under the action of the airflow and negative pressure in the annular sorting chamber, qualified fine-grained materials are discharged out of the cylinder. The stirred mill of the present invention is different from the conventional stirred mill. The entire grinding process is carried out in a fluidized environment. The movement state of the material in the grinding cylinder is more uniform, and the contact with the grinding medium is more sufficient. The discharge of qualified products is controlled by the negative pressure of the gradient flow field, and the adjustment is more flexible.

[0028] 2) The agitator of the present invention adopts a disc type, and the diameter and spacing of the agitator are arranged in a regular pattern, in conjunction with the diameter change law of the grinding cylinder. From the feeding end to the discharging end, the diameter of the agitator gradually increases, and the spacing between two adjacent agitators also gradually increases. At the initial stage of material feeding, the particle size is large, and the smaller agitator spacing slows down the material movement speed, so that the material is fully ground. As the material particle size decreases, the gradually increased agitator spacing increases the material movement speed, making the material movement smoother and discharged in time.

[0029] 3) The annular sorting chamber of the present invention is disposed between the mill's outer shell and the grinding drum. Its cross-sectional area changes from large to small along the direction from the feed end to the discharge end. Airflow passes through the annular sorting chamber, forming a negative pressure suction force perpendicular to the grinding drum and outward. The internal flow field presents a gradient along the direction from the feed end to the discharge end, and the negative pressure suction also shows a corresponding pattern of increasing from small to large. The fine particles in the grinding drum also increase from small to large along this direction. The intensity of the negative pressure matches the number of qualified fine particles in the grinding drum, facilitating the timely discharge of fine particles. In addition, the cold air continuously passing through the annular sorting chamber can continuously remove heat, ensuring continuous cooling and temperature reduction during long-term operation of the equipment.

[0030] 4) The present invention's homogenizing air supply chamber is located directly below the annular sorting chamber, corresponding to the fluidizing air hole area directly below the grinding cylinder. The homogenizing air supply chamber is connected to the fluidizing air hole area. Within the homogenizing air supply chamber, a homogenizing air plate is positioned between the mill housing and the grinding cylinder. The plate is provided with homogenizing air holes, and a layer of homogenizing balls is positioned beneath the plate. This uniform flow of cold air, under the action of the homogenizing balls and the plate, is uniformly fed into the homogenizing air supply chamber, thereby evenly feeding the grinding cylinder from bottom to top. This uniform airflow into the grinding cylinder fluidizes the material, avoiding blind spots in the grinding process and achieving coarse and fine separation.

[0031] 5) The fluidized dry stirred mill of the present invention is used to improve the rationality of material movement in a horizontal dry stirred mill, flexibly control the fineness of the milled product, avoid the occurrence of grinding blind spots, and improve the heat dissipation effect of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the specific embodiments of the present invention, the following is a brief introduction to the drawings required for use in the description of the specific embodiments. Obviously, the drawings described below are some specific embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 Schematic diagram of the external structure of a fluidized dry stirred mill provided in an embodiment of the present invention;

[0034] Figure 2 Schematic diagram of the internal structure of a fluidized dry stirred mill provided by an embodiment of the present invention;

[0035] Figure 3 2 is a schematic structural diagram of an air-locking feeding device provided in an embodiment of the present invention;

[0036] Figure 4 1 is a schematic structural diagram of an agitator provided in an embodiment of the present invention;

[0037] Figure 5Schematic diagram of the structure of the air inlet chamber of the mill provided by an embodiment of the present invention;

[0038] Figure 6 is a schematic cross-sectional view of a fluidized dry stirred mill provided in an embodiment of the present invention;

[0039] Figure 7 It is a working principle diagram of the fluidized dry stirred mill provided by an embodiment of the present invention.

[0040] In the figure: 1. Mill outer shell; 2. Grinding cylinder; 3. Air-locking feeding device; 3-1. Feeder outer shell; 3-2. Feeder inner shell; 3-3. Air-locking plate; 3-4. Rotating shaft; 3-5. Heavy hammer; 4. Discharge port; 5. Driving device; 6. Stirring shaft; 7. Foundation and bracket; 8. Mill air inlet; 8-1. Air inlet; 8-2. Mill air inlet chamber; 9. Mill air outlet; 10. Cooling device; 10-1. Cooling shell; 10-2. Heat sink; 10-3. Cooling medium inlet; 10-4. Cooling medium outlet; 11. Agitator; 12. Annular sorting chamber; 13. Homogenizing air supply chamber; 13-1. Classified air supply port; 13-2. Homogenizing air plate. DETAILED DESCRIPTION

[0041] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0042] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0043] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0044] Example

[0045] See also Figures 1 to 7 An embodiment of the present invention provides a fluidized dry stirred mill, including a mill outer shell 1, a grinding cylinder 2, a feeding port, a discharging port 4, a mill air inlet 8, a mill air outlet 9, a stirring shaft 6, an agitator 11, a driving device 5, a cooling device 10, an annular sorting chamber 12 and a homogenizing air supply chamber 13.

[0046] The mill housing 1 is supported and fixed by a foundation and bracket 7. A feed port and mill air inlet 8 are provided at one end of the mill housing 1, and a discharge port 4 and mill air outlet 9 are provided at the other end. The mill housing 1 consists of a cylinder and end caps at both ends, which are bolted to the cylinder. Both the cylinder and end caps are split-body structures, each capable of being divided into multiple sections, which are bolted together. Specifically, the cylinder and end caps are each horizontally divided into upper and lower sections, which are bolted together to facilitate disassembly and maintenance of the mill interior. The mill housing 1 has a length-to-diameter ratio of 1.5 to 8, and the mill housing 1 is arranged horizontally. In this embodiment, the mill housing 1 is 7000 mm long and 3500 mm in diameter.

[0047] The grinding drum 2 is coaxially disposed within the mill's outer shell 1, with the feed end of the grinding drum 2 fixedly connected to the mill's outer shell 1. The agitator shaft 6 is a high-speed shaft, one end of which is connected to the drive device 5. The other end passes through the mill's outer shell 1 and the grinding drum 2 along its axis and is supported by bearings mounted on the base and bracket 7. An agitator 11 is disposed on the agitator shaft 6 within the grinding drum 2. The grinding drum 2 is tapered overall, with its diameter gradually increasing from the feed end to the discharge end. Correspondingly, the diameter of the agitators 11 gradually increases from the feed end to the discharge end, and the distance between adjacent agitators 11 continuously increases.

[0048] The diameter of the grinding cylinder 2 is between 0.65 and 0.95 times the diameter of the mill shell 1, and the length is 0.8 to 0.95 times the length of the mill shell 1. The diameter of the feeding end of the grinding cylinder 2 is smaller than the diameter of the discharging end, and the inclination angle is 2° to 10°. The grinding cylinder 2 is filled with spherical grinding media of 2 to 10 mm, and the grinding medium filling rate is 50% to 90%. A fluidized air hole area connected to the homogenizing air supply chamber 13 is provided directly below the grinding cylinder 2. The diameter of the air hole in the fluidized air hole area is 0.1 to 0.5 times the diameter of the grinding medium, and the air hole opening area is The corresponding central angle on the cylinder cross section is 20° to 70°. The sidewall of the grinding cylinder 2 is uniformly provided with elongated sorting holes in the area corresponding to the annular sorting chamber 12. The width of the elongated sorting holes is 0.2 to 0.7 times the diameter of the grinding medium, and the corresponding central angle of the area where the elongated sorting holes are provided on the cylinder cross section is 90° to 270°. The end cap near the discharge end of the cylinder is conical with a cone angle of 90° to 170°. The end cap is uniformly provided with arc-shaped sorting holes. The width of the arc-shaped sorting holes is 0.2 to 0.7 times the diameter of the grinding medium. A hole is provided in the center of the end cap for the passage of the stirring shaft 6. The sorting holes on the sidewall and end cap of the grinding cylinder 2 allow qualified fine-grained material to be discharged from the cylinder. In this embodiment, the grinding cylinder 2 has a large end diameter of 3300 mm, a small end diameter of 2700 mm, a length of 6500 mm, an inclination angle of 2.6°, and is filled with 5 mm spherical grinding media with a medium filling rate of 75%; the air supply hole has a diameter of 1.5 mm, and the central angle of the area where the air supply hole is opened on the cylinder cross section is 45°. The width of the elongated sorting hole is 3 mm, and the central angle of the area where the elongated sorting hole is opened on the cylinder cross section is 240°. The cone angle of the end cover is 165°, and the width of the arc-shaped sorting hole is 3 mm.

[0049] The agitator 11 is a disc-type structure. The distance between the outer edge of the agitator 11 and the inner wall of the grinding cylinder 2 is 2 to 10 times the diameter of the grinding medium. In accordance with the diameter change law of the grinding cylinder 2, the diameter of the agitator 11 gradually increases from the feeding end to the discharge end, and the distance between two adjacent agitators 11 also gradually increases. The disk surface of the agitator 11 is evenly provided with multiple through holes along the circumferential direction, and the total through area on the disk surface accounts for 0.2 to 0.6. In this embodiment, the distance between the agitator 11 and the inner wall of the grinding cylinder 2 is 20 mm, and the through area on the agitator 11 disk surface is 2 m 2 At the beginning of material feeding, the particle size is large, and the smaller distance between the stirrers 11 slows down the material movement speed, making the material fully ground. As the material particle size decreases, the gradually increasing distance between the stirrers 11 increases the material movement speed, making the material movement smoother and discharged in time.

[0050] An annular sorting chamber 12 is formed between the grinding drum 2 and the mill housing 1. The cross-sectional area of the annular sorting chamber 12 decreases from large to small along the direction from the feed end to the discharge end. The airflow through the annular sorting chamber 12 forms a negative pressure suction force perpendicular to the axial direction of the grinding drum 2 and outward. The internal flow field presents a gradient along the direction from the feed end to the discharge end, and the negative pressure suction also shows a pattern of increasing from small to large. The fine particles in the grinding drum 2 also increase from small to large along this direction. The intensity of the negative pressure matches the number of qualified fine particles in the grinding drum 2, which facilitates the timely discharge of fine particles. In addition, the cold air continuously passing through the annular sorting chamber 12 can continuously remove heat, ensuring continuous cooling and temperature reduction during long-term operation of the equipment.

[0051] A homogenizing air supply chamber 13 is provided directly below the annular sorting chamber 12. The range of the homogenizing air supply chamber 13 corresponds to the fluidizing air hole area directly below the grinding cylinder 2. The central angles of the two on the cross section of the grinding cylinder 2 are the same. The homogenizing air supply chamber 13 is separated from the annular sorting chamber 12 by a partition in the circumferential direction; in the homogenizing air supply chamber 13, a graded air supply port 13-1 is provided at the bottom of the mill outer shell 1, and a homogenizing air plate 13-2 is provided between the mill outer shell 1 and the grinding cylinder 2. The homogenizing air plate 13-2 is provided with homogenizing air holes. The diameter of the homogenizing air holes is 1 to 3 times the diameter of the grinding medium. A layer of homogenizing balls is provided between the homogenizing air plate 13-2 and the mill outer shell 1. The diameter of the homogenizing balls is 1.5 to 2 times the diameter of the homogenizing air holes, and the filling rate of the homogenizing balls is 35% to 50%. The cool air entering the graded air supply port 13-1 is evenly supplied to the homogenizing air supply chamber 13 by the homogenizing balls and the homogenizing air plate 13-2, and thus evenly supplied from bottom to top to the grinding cylinder 2. In this embodiment, the homogenizing air holes have a diameter of 6 mm, the homogenizing balls have a diameter of 9 mm, and the homogenizing ball filling rate is 40%.

[0052] The mill air inlet 8 is provided at the end cover on one side of the mill outer shell 1, and includes a mill air inlet chamber 8-2. The mill air inlet chamber 8-2 is in the shape of a circular ring. A plurality of air inlets 8-1 are evenly arranged around the mill air inlet chamber 8-2. The plurality of air inlets 8-1 can ensure uniform air intake. The air inlet 8-1 is connected to an air supply device for supplying air into the mill air inlet chamber 8-2. The mill air inlet chamber 8-2 is connected to the annular sorting chamber 12 to supply cold air into the annular sorting chamber 12. Specifically, at the connection point between the mill air inlet chamber 8-2 and the annular sorting chamber 12, the mill air inlet chamber 8-2 is covered on the end cover of the mill outer shell 1. A vent is provided on the end cover in the area corresponding to the annular sorting chamber 12. The vent is also a corresponding hollow structure. At this time, the grinding cylinder 2 is connected to the mill outer shell 1 through the feeder outer shell 3-1 of the air-locking feeding device 3 and the axial end plates on both sides of the homogenizing air supply chamber 13, thereby playing a supporting role.

[0053] The mill air outlet 9 is arranged on the upper part of the end cover on the discharge side of the mill outer shell 1. The mill air outlet 9 is arranged horizontally, and the downstream of the mill air outlet 9 is connected to the dust collecting equipment.

[0054] The feeding port is arranged just above the center of one end of the cylinder of the mill outer shell 1, and an air-locking feeding device 3 is provided at the feeding port. The air-locking feeding device 3 is connected with the grinding cylinder 2 so that the material falls vertically into the grinding cylinder 2; the air-locking feeding device 3 comprises a feeder outer shell 3-1, a feeder inner shell 3-2, an air-locking plate 3-3 and a heavy hammer 3-5. The lower part of the feeder inner shell 3-2 extends into the feeder outer shell 3-1, and the air-locking plate 3-3 is placed in the feeder outer shell 3-1 and is located below the feeder inner shell 3-2. On the other hand, the air lock plate 3-3 is fixedly connected to the weight 3-5 and is installed on the outer shell 3-1 of the feeder through the rotating shaft 3-4, so that when no material passes through, the air lock plate 3-3 is in contact with the bottom end surface of the inner shell 3-2 of the feeder under the action of the weight 3-5, that is, the angle between the air lock plate 3-3 and the horizontal direction is reduced, blocking the feeding channel; when material passes through, the weight of the material causes the air lock plate 3-3 to separate from the bottom end surface of the inner shell 3-2 of the feeder, that is, the angle between the air lock plate 3-3 and the horizontal direction is increased, opening the feeding channel and allowing the material to pass smoothly.

[0055] The discharge port 4 is arranged at the bottom of the outer shell 1 of the mill to facilitate the rapid discharge of separated materials.

[0056] A cooling device 10 is arranged on the periphery of the mill outer shell 1; the cooling device 10 includes a cooling shell 10-1 and heat sinks 10-2, and a sandwich is formed between the cooling shell 10-1 and the mill outer shell 1, and a plurality of heat sinks 10-2 are fixed on the outer wall of the mill outer shell 1 in the sandwich to increase the heat dissipation area; a plurality of heat sinks 10-2 are also arranged on the outer surface of the cooling shell 10-1 to increase the heat dissipation area and improve the heat dissipation speed; a cooling medium inlet 10-3 is arranged at the lower part of the cooling shell 10-1 located at the discharge end side, and a cooling medium outlet 10-4 is arranged at the upper part of the cooling shell 10-1 located at the feed end side, and the cooling medium flows in the sandwich to cool the mill outer shell 1 as a whole and take away the heat of the mill; the cooling device 10 is a split structure corresponding to the cylinder of the mill outer shell 1, consistent with the split design of the cylinder, and is divided into upper and lower parts.

[0057] The driving device 5 is arranged at one end of the feeding side of the mill shell 1 and adopts a permanent magnet direct drive or a motor acceleration and reduction gear drive mode. In this embodiment, the permanent magnet direct drive mode is preferably adopted.

[0058] The specific operation process of the stirring mill of the present invention is as follows:

[0059] The grinding drum 2 is filled with grinding media. A drive unit 5 rotates the agitator shaft 6, which in turn rotates the agitator 11 mounted thereon. Material is fed into the grinding drum 2 via an air-locked feeder 3 located above one end of the outer shell. The material, combined with the grinding media, undergoes multi-dimensional cyclic and rotational motion under the high-speed rotation of the agitator 11. Material particles are crushed by the grinding media, primarily through friction and shear forces. The spacing between adjacent agitators 11 increases from the feed end to the discharge end, and the grinding drum 2 assumes a tapered shape, facilitating smooth material movement. Simultaneously, the graded air supply ports 13-1 of the homogenizing air supply chamber 13 introduce cool air from bottom to top, passing through the air supply holes in the fluidizing air port area below the grinding drum 2 and into the interior of the grinding drum 2. This upward airflow fluidizes the material, resulting in a more uniform movement within the grinding drum 2 and more complete contact with the grinding media. Furthermore, the particles are graded under the influence of gravity and the upward airflow, with fine particles gradually moving upward. The cold air introduced into the mill air inlet chamber 8-2 enters the annular sorting chamber 12 between the grinding cylinder 2 and the mill outer shell 1. The airflow in the annular sorting chamber 12 provides negative pressure, allowing fine particles to pass through the sorting holes on the side walls, upper wall and end of the grinding cylinder 2 and enter the annular sorting chamber 12. Since the cross-sectional area of the annular sorting chamber 12 gradually decreases from the feeding end to the discharging end, the flow field inside it presents a gradient along this direction, and the negative pressure suction also presents a pattern of increasing from small to large. The fine particles in the grinding cylinder 2 also present a state of increasing from small to large along this direction, which is more conducive to the timely discharge of fine particles. The qualified fine particles entering the annular sorting chamber 12 move to the discharging end under the action of wind, are discharged through the discharge port 4, and are discharged through the mill outlet 9. The cold air introduced can also continuously remove heat, ensuring continuous cooling and cooling of the equipment during long-term operation.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fluidized dry stirred mill, characterized in that: It includes the outer shell of the mill, grinding cylinder, feeding port, discharging port, mill air inlet, mill air outlet, stirring shaft, stirrer, driving device, cooling device, annular sorting chamber and homogenizing air supply chamber; The outer shell of the mill is supported and fixed by a foundation and a bracket. A feed port and a mill air inlet are provided at one end of the outer shell of the mill, and a discharge port and a mill air outlet are provided at the other end. The grinding drum is arranged inside the outer shell of the mill and is coaxially arranged. The feeding end of the grinding drum is connected and fixed to the outer shell of the mill, and the grinding drum is communicated with the feed port. The grinding drum is filled with grinding media. One end of the stirring shaft is connected to the driving device, and the other end passes through the outer shell of the mill and the grinding drum along the axis and is supported by a bearing installed on the foundation and the bracket. An agitator is provided on the stirring shaft located in the grinding drum. A cooling device is provided on the periphery of the outer shell of the mill. The grinding cylinder is tapered as a whole, and the diameter of the grinding cylinder gradually increases from the feeding end to the discharging end. Correspondingly, the diameter of the agitator gradually increases from the feeding end to the discharging end, and the distance between two adjacent agitators continues to increase; An annular sorting chamber is formed between the grinding cylinder and the outer shell of the mill. The cross-sectional area of the annular sorting chamber decreases from large to small along the direction from the feeding end to the discharging end. The annular sorting chamber is connected to the air inlet of the mill. The side wall of the grinding cylinder is provided with sorting holes in the area corresponding to the annular sorting chamber and on the end cover of the grinding cylinder discharging end. A homogenizing air supply chamber is arranged directly below the annular sorting chamber. The range of the homogenizing air supply chamber corresponds to the fluidizing air hole area directly below the grinding cylinder. The central angles of the two corresponding to each other on the cross section of the grinding cylinder are the same. The homogenizing air supply chamber is separated from the annular sorting chamber by a partition in the circumferential direction. In the homogenizing air supply chamber, a graded air supply port is arranged at the bottom of the mill outer shell, a homogenizing air plate is arranged between the mill outer shell and the grinding cylinder, homogenizing air holes are arranged on the homogenizing air plate, and a layer of homogenizing balls is arranged between the homogenizing air plate and the mill outer shell.

2. The fluidized dry stirred mill according to claim 1, characterized in that The diameter of the grinding cylinder is between 0.65 and 0.95 times the diameter of the mill shell, and the length is 0.8 to 0.95 times the length of the mill shell. The diameter of the feeding end of the grinding cylinder is smaller than the diameter of the discharging end, and the inclination angle is 2° to 10°. The grinding cylinder is filled with 2 to 10 mm spherical grinding media, and the grinding media filling rate is 50% to 90%; The diameter of the air supply holes in the fluidizing air hole area is 0.1 to 0.5 times the diameter of the grinding medium, and the central angle of the area where the air supply holes are opened on the cylinder cross section is 20° to 70°; the side wall of the grinding cylinder is evenly provided with long strip sorting holes in the corresponding annular sorting chamber area, and the width of the long strip sorting holes is 0.2 to 0.7 times the diameter of the grinding medium, and the central angle of the area where the long strip sorting holes are opened on the cylinder cross section is 90° to 270°; the end cover of the cylinder close to the discharge end is conical with a cone angle of 90° to 170°, and arc-shaped sorting holes are evenly provided on the end cover, and the width of the arc-shaped sorting holes is 0.2 to 0.7 times the diameter of the grinding medium.

3. The fluidized dry stirred mill according to claim 1, characterized in that The diameter of the homogenizing air hole is 1 to 3 times the diameter of the grinding medium, the diameter of the homogenizing ball is 1.5 to 2 times the diameter of the homogenizing air hole, and the filling rate of the homogenizing ball is 30% to 50%.

4. The fluidized dry stirred mill according to claim 1, characterized in that The mill air inlet is arranged at the end cover on one side of the mill outer shell, and includes a mill air inlet chamber. The mill air inlet chamber is in a circular shape, and multiple air inlets are evenly arranged around the mill air inlet chamber. The air inlets are connected to the air supply equipment to supply air into the mill air inlet chamber; the mill air inlet chamber is connected to the annular sorting chamber to supply cold air into the annular sorting chamber.

5. The fluidized dry stirred mill according to claim 1, characterized in that The mill air outlet is arranged on the upper part of the end cover on the discharge side of the mill outer shell, the mill air outlet is arranged horizontally, and the downstream of the mill air outlet is connected to the dust collecting equipment.

6. The fluidized dry stirred mill according to claim 1, characterized in that The feeding port is arranged just above the center of one end of the cylinder of the mill outer shell, and an air-locking feeding device is provided at the feeding port, and the air-locking feeding device is communicated with the grinding cylinder so that the material falls vertically into the grinding cylinder; the air-locking feeding device comprises a feeder outer shell, a feeder inner shell, an air-locking plate and a weight, the lower part of the feeder inner shell extends into the feeder outer shell, the air-locking plate is placed in the feeder outer shell and below the feeder inner shell, the air-locking plate is fixedly connected to the weight and is installed on the feeder outer shell through a rotating shaft, so that when no material passes through, the air-locking plate fits with the bottom end surface of the feeder inner shell under the action of the weight, thereby blocking the feeding channel; When material passes through, the weight of the material separates the air lock plate from the bottom end surface of the feeder inner shell, opening the feeding channel and allowing the material to pass smoothly.

7. The fluidized dry stirred mill according to claim 1, characterized in that The discharge port is arranged at the bottom of the outer shell of the mill.

8. The fluidized dry stirred mill according to claim 1, characterized in that The outer shell of the mill is composed of a cylinder and end covers at both ends, and the end covers are connected to the cylinder by bolts; the cylinder and the end covers are both split structures, each of which can be divided into multiple parts, and the parts are connected and assembled by bolts; the ratio of the length to the diameter of the outer shell of the mill is 1.5 to 8, and the outer shell of the mill is arranged horizontally.

9. The fluidized dry stirred mill according to claim 1, characterized in that The agitator is a disc-type structure, and the distance between the outer edge of the agitator and the inner wall of the grinding cylinder is 2 to 10 times the diameter of the grinding medium; a plurality of through holes are evenly arranged on the disk surface of the agitator along the circumferential direction, and the total through area on the disk surface accounts for 0.2 to 0.

6.

10. The fluidized dry stirred mill according to claim 1, characterized in that: The cooling device includes a cooling shell and heat sinks. A sandwich is formed between the cooling shell and the outer shell of the mill. Multiple groups of heat sinks are fixed on the outer wall of the outer shell of the mill in the sandwich. Multiple groups of heat sinks are also provided on the outer surface of the cooling shell. A cooling medium inlet is provided at the lower part of the cooling shell located on the discharge end side, and a cooling medium outlet is provided at the upper part of the cooling shell located on the feed end side. The cooling medium flows in the sandwich. The cooling device is a split structure corresponding to the cylinder of the outer shell of the mill.

11. The fluidized dry stirred mill according to claim 1, characterized in that: The driving device is arranged at one end of the feeding side of the mill shell and adopts a permanent magnet direct drive or a motor acceleration and reduction gear drive mode.

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