A stirred mill with high particle size adaptability

Abstract

The present invention discloses a stirred mill with high particle size adaptability, comprising a grinding cylinder, wherein a crushing zone and a grinding zone are sequentially arranged in the grinding cylinder from the feed port to the discharge port; a material guide stirrer and multiple crushing stirrers are sequentially arranged on the stirring shaft in the crushing zone from the feeding to the discharge direction; a material guide stirrer, multiple grinding stirrers and a separation device are sequentially arranged on the stirring shaft in the grinding zone from the feeding to the discharge direction; the grinding medium diameter and density in the crushing zone are both greater than the grinding medium diameter and density in the grinding zone, and the grinding medium filling rate in the crushing zone is less than the grinding medium filling rate in the grinding zone; the grinding stirrers are divided into forward grinding stirrers and reverse grinding stirrers, which are arranged in a cross-uniform manner in sequence to achieve rotation in different directions; and the separation device is a hollow hemispherical structure with adjustable hole spacing. The present invention can improve the adaptability of the dry stirred mill to the particle size of the raw materials, greatly improve the grinding efficiency, and flexibly control the fineness of the milled product.

Description

Technical Field

[0001] The invention relates to the technical field of stirred mills, in particular to a stirred mill with high particle size adaptability. 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 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 circulation and rotational motion, creating a large 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 frictional pulverization. Extrusion and impact forces primarily affect the initial pulverization, while friction and shear determine the fine grinding efficiency. Stirred mills can be categorized as dry or wet processes based on the grinding environment, and as horizontal or vertical based on their structural form.

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

[0004] (1) Existing dry stirred mills are only suitable for processing micron-sized particles because the forces acting on the materials are mainly friction and shear. They have poor adaptability to coarse-grained materials and are difficult to grind.

[0005] (2) In the existing dry stirred mill, the movement of the material and the grinding media in the mill is weak, the friction and shear force generated between the grinding media are small, and the grinding area is mainly concentrated near the stirring disk and the inner wall of the cylinder, resulting in poor grinding effect and low grinding efficiency;

[0006] (3) In the existing dry stirred mill, the grinding media in the mill are acted upon by the agitator, and move in a circular motion in the same clockwise direction on the mill cross section. With the vertical diameter as the boundary, the grinding media on one side move upward, while the grinding media on the other side move downward. Due to the action of gravity, the kinetic energy of the grinding media moving downward is higher than that of the grinding media moving upward. As a result, the grinding media moving downward has a greater impact on one side of the barrel wall, causing the mill to vibrate and reducing the reliability of the mill.

[0007] (4) The existing dry stirred mill lacks effective control measures for the fineness of the milled material, lacks control measures for the residence time of the material in the mill, and is not flexible enough in controlling the fineness of the milled material;

[0008] (5) The existing dry stirring mill has complicated assembly and disassembly of the barrel and the agitator, making maintenance and replacement inconvenient. Summary of the Invention

[0009] In order to solve the problems of existing dry stirred mills such as poor adaptability to coarse-particle materials, low grinding efficiency, poor equipment reliability, inflexible control of discharge fineness, and difficult disassembly and maintenance, the present invention provides a stirred mill with high particle size adaptability. The stirred mill can improve the adaptability of the dry stirred mill to the particle size of raw materials, greatly improve the grinding efficiency of the dry stirred mill, flexibly control the fineness of the discharged product, improve equipment reliability, and improve the convenience of equipment disassembly and maintenance.

[0010] The present invention is achieved as follows: a stirred mill with high particle size adaptability includes a grinding drum, a feed port, a discharge port, a mill air inlet, a mill air outlet, a stirring shaft, a driving device, a separating device, and a cooling device; the grinding drum is supported and fixed by a foundation and a bracket, with the feed port and the mill air inlet provided at one end of the grinding drum, and the discharge port and the mill air outlet provided at the other end; one end of the stirring shaft is connected to the driving device, and the other end passes through the grinding drum along the axis of the grinding drum and is supported by a bearing installed on the foundation and the bracket; a cooling device is provided on the periphery of the grinding drum;

[0011] The grinding cylinder is provided with a crushing zone and a grinding zone in sequence from the feed port to the discharge port, and a partition plate is provided between the crushing zone and the grinding zone; a material guide stirrer and multiple crushing stirrers are provided on the stirring shaft in the crushing zone in sequence from the feed port to the discharge port; a material guide stirrer, multiple grinding stirrers and a separation device for separating the ground material and the grinding medium are provided on the stirring shaft in the grinding zone in sequence from the feed port to the discharge port; the diameter and density of the grinding medium in the crushing zone are both greater than those in the grinding zone, and the filling rate of the grinding medium in the crushing zone is less than that in the grinding zone;

[0012] The grinding stirrer is divided into a forward grinding stirrer and a reverse grinding stirrer. The forward grinding stirrer and the reverse grinding stirrer are arranged uniformly and crosswise along the stirring shaft. The forward grinding stirrer is fixed on the stirring shaft, and the reverse grinding stirrer is installed on the stirring shaft through a coaxial direction-changing transmission mechanism, so that the forward and reverse grinding stirrers can rotate in different directions under the action of the stirring shaft and the coaxial direction-changing transmission mechanism.

[0013] The separation device is a hollow hemispherical structure and is a separation device with adjustable hole spacing, so that the size of the sieve holes and the screening area can be controlled.

[0014] The drive unit rotates the agitator shaft, which in turn drives the feed agitator, crushing agitator, separator disc, and forward grinding agitator mounted on it to rotate in the same direction as the agitator shaft. Simultaneously, this drives the coaxial direction-changing transmission mechanism mounted on the agitator shaft, which in turn drives the reverse grinding agitator to rotate in the opposite direction of the agitator shaft. Material fed into the grinding drum first enters the crushing zone. Driven by the corresponding feed agitator, it rapidly moves toward the crushing agitator within the mill. The impact of the grinding media driven by the crushing agitator causes rapid crushing. Once crushed to a certain fineness, the material passes through the separator disc and enters the grinding zone. Driven by the corresponding feed agitator, the material of a certain particle size rapidly passes through the separator disc and moves toward the grinding agitator. Under the high-speed forward and reverse rotation of the two grinding agitators, the material and the grinding media undergo multi-dimensional circulation and rotational motion. Material particles are crushed by the grinding media, which primarily utilizes friction and shear forces. Cold air is introduced into the mill's air inlet. Driven by the wind and agitation, the material gradually moves to the discharge end. The material then passes through an adjustable-pitch separator, separating the qualified product from the grinding media. The grinding media is intercepted by the separator and retained within the grinding drum, while the finely ground material is discharged. The adjustable-pitch separator allows for flexible adjustment of the screening aperture, thereby adjusting the grinding time within the mill by adjusting the discharge speed and thus the fineness of the discharged product. The qualified product discharged from the separator is discharged through the discharge port. The cold air entering the grinding drum passes through the separator and is then discharged through the outlet above the discharge port. A cooling device is installed on the outer wall of the grinding drum to ensure continuous cooling during long-term operation.

[0015] Preferably, the material guide agitator in the crushing zone is arranged near the feed port, and the material guide agitator in the grinding zone is arranged near the separating disk. Both of the material guide agitators are fixed on the stirring shaft, and have the same structure. Both are blade-type agitators, consisting of a material guide fixing ring and a plurality of blades. The material guide fixing ring is fixed on the stirring shaft, and fixing holes are evenly distributed on the outer circumferential surface of the material guide fixing ring; the blades are fixed on the material guide fixing ring through the fixing holes, and the blades are long strips with a wide head and a narrow bottom. The head of the blade is an arc shape, and a fixing seat and a bolt column are provided at the bottom of the blade, and the bolt column is connected and fixed to the fixing hole; the angle between the blade and the radial direction of the material guide agitator is 60°~85°, and the distance between the top of the blade and the inner wall of the grinding cylinder is 5~15 times the diameter of the grinding medium in the grinding zone.

[0016] Preferably, the crushing agitator is fixed on the agitator shaft and is a rod-type agitator, consisting of a crushing fixed ring and a plurality of stirring rods. The crushing fixed ring is fixed on the agitator shaft, and fixing holes are evenly distributed on the outer circumference of the crushing fixed ring; the stirring rods are fixed on the crushing fixed ring through the fixing holes; the head diameter of the stirring rod is larger than the bottom diameter, and the head is hemispherical. The material-facing surface of the stirring rod is provided with a long strip medium groove along the radial direction of the crushing agitator, and a bolt column is provided at the bottom of the stirring rod, and the bolt column is connected and fixed with the fixing hole; the distance between the outer edge of the crushing agitator and the inner wall of the grinding cylinder is 2 to 10 times the diameter of the grinding medium in the crushing area.

[0017] Preferably, the separating disk is fixed on the stirring shaft and has a split structure. It is divided into multiple annular disk bodies from the inside to the outside in the radial direction, which are a separating fixing ring and multiple separating rings in sequence. The separating fixing ring is fixed on the stirring shaft, and the separating fixing rings adjacent to the separating fixing ring and the separating fixing rings, as well as the two adjacent separating rings, are all connected and fixed by radial bolts, so that the separating fixing ring and each separating ring are fixedly combined in sequence to form a complete separating disk; each of the separating rings is divided into at least two parts.

[0018] Preferably, the distance between the outer edge of the separating disk and the inner wall of the grinding cylinder is 0.1 to 0.8 times the diameter of the grinding medium in the grinding area; a plurality of arc-shaped sieve holes are evenly arranged on the disk surface along the circumferential direction, the width of the sieve holes is 0.1 to 0.5 times the diameter of the grinding medium in the grinding area, and the total passing area on the disk surface accounts for 0.4 to 0.8; the edge of the separating disk cooperates with the cylinder separating ring provided on the inner wall of the grinding cylinder to form a seal, and the gap between the separating disk and the cylinder separating ring is 0.1 to 0.4 times the diameter of the grinding medium in the grinding area.

[0019] Preferably, the forward grinding agitator and the reverse grinding agitator have the same structure, both of which are disc agitators. The disc agitator is a split structure, which is divided into multiple annular discs from the inside to the outside in radial direction, which are a grinding fixed ring and multiple grinding stirring rings in sequence. The grinding fixed ring is fixed to the stirring shaft, and the grinding stirring rings adjacent to the grinding fixed ring and the grinding fixed ring, as well as the two adjacent grinding stirring rings, are all connected and fixed by radial bolts, so that the grinding fixed ring and each grinding stirring ring are fixedly combined in sequence to form a complete grinding agitator; each of the grinding stirring rings is divided into at least two parts.

[0020] Preferably, the distance between the outer edge of the grinding agitator and the inner wall of the grinding cylinder is 2 to 10 times the diameter of the grinding medium in the grinding area; the disc surface of the grinding agitator is evenly provided with multiple through holes along the circumferential direction, and the total through area on the disc surface accounts for 0.2 to 0.6.

[0021] Preferably, the coaxial direction-changing transmission mechanism consists of a stirring shaft bevel gear, two direction-changing transmission bevel gears, a hollow shaft bevel gear, a hollow shaft and a sealing cover, the stirring shaft bevel gear is fixed on the stirring shaft, and the two direction-changing transmission bevel gears are symmetrically arranged on both sides of the stirring shaft and mesh with the stirring shaft bevel gear at 90 degrees; the hollow shaft bevel gear is fixed on the hollow shaft and meshes with the two direction-changing transmission bevel gears at 90 degrees, and the two ends of the hollow shaft are coaxially mounted on the stirring shaft through hollow shaft bearings; each of the direction-changing transmission bevel gears is rotatably supported by a gear seat installed in the sealing cover, and the stirring shaft bevel gear, the two direction-changing transmission bevel gears and the hollow shaft bevel gear are all sealed in the sealing cover, and the two ends of the sealing cover are connected to the stirring shaft and the hollow shaft through sealing cover bearings respectively; the reverse grinding agitator is fixed on the hollow shaft located outside the sealing cover, and under the action of the coaxial direction-changing transmission mechanism, the hollow shaft rotates in the opposite direction to the stirring shaft, driving the reverse grinding agitator to rotate in the opposite direction.

[0022] Preferably, the small diameter end of the adjustable hole spacing separation device is detachably fixed to the stirring shaft, and the large diameter end forms a labyrinth seal with the grinding cylinder; the adjustable hole spacing separation device is composed of an outer sieve plate and an inner sieve plate, the inner sieve plate is placed on the inner side of the outer sieve plate and fits with the outer sieve plate, the outer sieve plate is detachably installed on the stirring shaft and rotates with the shaft, and the inner sieve plate can rotate relative to the outer sieve plate; each sieve plate surface is provided with circular sieve holes or long strip sieve holes, the opening position and shape of the inner sieve plate and the outer sieve plate are consistent, and the diameter or width of the sieve hole is 0.5 to 0.9 times the diameter of the grinding medium in the grinding area.

[0023] Further preferably, the large diameter end edge of the outer sieve plate is provided with an annular sealing plate, the cross-section of the annular sealing plate is "L"-shaped, and an annular sealing ring is provided on the inner wall of the grinding cylinder, and the plate parallel to the axial direction in the annular sealing plate cooperates with the annular sealing ring to form a sealing area; the large diameter end edge of the inner sieve plate is provided with a fastening ring, and a plurality of arc-shaped long through holes are evenly opened on the fastening ring along the circumferential direction, and a plurality of fixed threaded columns for cooperating with the arc-shaped long through holes are evenly arranged on the plate perpendicular to the axial direction in the annular sealing plate along the circumferential direction, the diameter of the fixed threaded column matches the width of the arc-shaped long through hole, and the fixed threaded column can move in the arc-shaped long through hole so that the inner sieve plate can be rotated relative to the outer sieve plate, and the fixed threaded column passes through the arc-shaped long through hole and is fastened by a nut to fix the inner sieve plate and the outer sieve plate.

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

[0025] Preferably, the grinding cylinder 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.

[0026] Preferably, the ratio of the length to the diameter of the grinding cylinder is 1.5 to 8, and the grinding cylinder is arranged horizontally; the crushing zone is filled with 5 to 20 mm spherical grinding media, and the filling rate of the grinding media is 30% to 70%; the grinding zone is filled with 2 to 10 mm spherical grinding media, and the filling rate of the grinding media is 50% to 90%.

[0027] Preferably, the feeding port is arranged at the upper part of the end cover on one side of the grinding cylinder, and an air-locking feeding device is provided at the feeding port, and the air-locking feeding device allows the material to enter the grinding cylinder at an angle of 45° to 75° with the horizontal direction; 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.

[0028] Preferably, the discharge port is arranged at the bottom of the grinding cylinder body.

[0029] Preferably, the mill air inlet is arranged at the upper part of the grinding cylinder and connected to the upper wall of the grinding cylinder. The air inlet direction forms an angle of 15° to 45° with the horizontal direction. Air holes are evenly opened on the wall of the grinding cylinder in the ventilation area. The diameter of the air holes is 0.1 to 0.9 times the diameter of the grinding medium.

[0030] Preferably, the mill air outlet is arranged at the upper part of the end cover on the discharge side of the grinding cylinder, the mill air outlet is arranged horizontally, and the mill air outlet is connected to the dust collection equipment downstream.

[0031] Preferably, the driving device is arranged at one end of the feeding side of the grinding cylinder and adopts a permanent magnet direct drive or a motor acceleration and reducer drive mode.

[0032] The present invention has the following advantages and beneficial effects:

[0033] 1) The grinding drum of the present invention is divided into a crushing zone and a grinding zone. Compared to conventional grinding zones, the grinding media in the crushing zone has a larger diameter and density. Combined with a rod-type crusher and agitator, this exerts a stronger impact on the material and grinding media, promoting rapid material crushing. The grinding media filling rate in the crushing zone is lower than that in the grinding zone, providing more space for the material and grinding media to fall within the crushing zone, enhancing the crushing effect. This targeted crushing action ensures that the material fed into the grinding drum is fully crushed, improving the mill's adaptability to handling large-particle materials. Furthermore, the grinding drum adopts a split design, making it easy to disassemble and inspect the mill interior.

[0034] 2) The separator disc of the present invention achieves dynamic separation between the crushing and grinding zones, ensuring separation while also facilitating smooth passage of materials. Furthermore, the separator disc adopts a split design, making it easy to disassemble and maintain.

[0035] 3) The present invention's feed agitator generates a thrust toward discharge, accelerating material movement. The feed agitator positioned near the feed inlet rapidly directs new feed material toward the crushing and grinding agitator within the grinding drum, where it is crushed and ground. The feed agitator positioned near the separator plate rapidly directs material of a certain particle size through the separator plate toward the grinding agitator. Furthermore, the feed agitator's split design facilitates assembly and disassembly.

[0036] 4) The present invention's crusher-agitator directly contacts the grinding media and material, applying impact force to both, facilitating the crushing of large particles. The media groove located on the material-facing surface reduces wear on the crusher itself. Furthermore, the crusher-agitator's split design facilitates disassembly and replacement.

[0037] 5) The grinding agitator of the present invention is divided into a forward grinding agitator and a reverse grinding agitator, which are arranged coaxially in sequence. Under the action of the coaxial direction-changing transmission device, adjacent grinding agitators can realize counter-rotation. Each grinding agitator drives the grinding media near it to make circular motion in the same direction, so that the grinding media between adjacent grinding agitators present opposite circular motion directions. On the one hand, the difference in the movement direction of the grinding media increases the shear force and friction force between the grinding media, so that the materials therein are subjected to greater shear and friction, and are more easily crushed. From the perspective of the equipment's grinding mechanism, the grinding efficiency is improved, which is beneficial to the fine grinding of the material; on the other hand, the difference in the movement direction of the grinding media balances the impact force of the dropped grinding media on both sides of the cylinder, avoiding the vibration of the mill caused by the impact of the dropped grinding media on one side of the cylinder when the movement direction of the grinding media is consistent, thereby improving the reliability of the mill. At the same time, the grinding agitator adopts a split design, which is convenient for disassembly and replacement.

[0038] 6) The coaxial direction-changing transmission mechanism of the present invention can transmit a torque in the opposite direction of the rotation of the stirring shaft, so that adjacent coaxial grinding stirrers can rotate in different directions.

[0039] 7) The hole-pitch adjustable separation device of the present invention adopts a hollow hemisphere form. Compared with other forms of separation devices, it has a larger material contact area and a larger screening area, which is conducive to the discharge of qualified products. At the same time, the double-layer sieve plate structure can adjust the sieve hole size of the entire device by rotating the inner sieve plate so that the solid area of ​​the inner sieve plate blocks the sieve holes of the outer sieve plate, thereby achieving the effect of flexible adjustment of the overall screening area, thereby regulating the discharge speed of the material, adjusting the residence time of the material in the mill, and controlling the fineness of the product.

[0040] 8) The cooling device of the present invention is arranged on the outside of the grinding cylinder body and also adopts a split design, which is consistent with the split design of the cylinder body; an interlayer is formed between the cooling shell and the cylinder body, and multiple groups of heat sinks are fixed on the outer wall of the grinding cylinder body in the interlayer. Multiple groups of heat sinks are also arranged on the outer surface of the cooling shell, which increases the heat dissipation area and improves the heat dissipation speed.

[0041] 9) The high-particle-size adaptability stirred mill of the present invention can improve the raw material particle size adaptability of the dry stirred mill, enhance the grinding efficiency of the dry stirred mill, flexibly control the fineness of the milled product, enhance the reliability of the equipment, and improve the convenience of disassembly, assembly, and maintenance of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] 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.

[0043] Figure 1 Schematic diagram of the external structure of a stirred mill with high particle size adaptability provided by an embodiment of the present invention;

[0044] Figure 2 Schematic diagram of the internal structure of a stirred mill with high particle size adaptability provided by an embodiment of the present invention;

[0045] Figure 3 2 is a schematic structural diagram of an air-locking feeding device provided in an embodiment of the present invention;

[0046] Figure 4 1 is a schematic structural diagram of a material guide stirrer provided in an embodiment of the present invention;

[0047] Figure 5 1 is a schematic structural diagram of a crushing and stirring device provided by an embodiment of the present invention;

[0048] Figure 6 is a schematic structural diagram of a separator plate provided in an embodiment of the present invention;

[0049] Figure 7 1 is a schematic structural diagram of a forward grinding agitator provided by an embodiment of the present invention;

[0050] Figure 8 1 is a schematic structural diagram of a coaxial direction-changing transmission mechanism provided by an embodiment of the present invention;

[0051] Figure 9 It is a structural schematic diagram of the hole-pitch adjustable separation device provided in an embodiment of the present invention.

[0052] In the figure: 1. Grinding cylinder; 2. Air-locking feeding device; 2-1. Feeder outer shell; 2-2. Feeder inner shell; 2-3. Air-locking plate; 2-4. Rotating shaft; 2-5. Heavy hammer; 3. Discharge port; 4. Driving device; 5. Stirring shaft; 6. Foundation and bracket; 7. Mill air inlet; 8. Mill air outlet; 9. Cooling device; 9-1. Cooling shell; 9-2. Heat sink; 9-3. Cooling medium inlet; 9-4. Cooling medium outlet; 10. Material guide stirrer; 10-1. Material guide fixing ring; 10-2. Blade; 11. Crushing stirrer; 11-1. Crushing fixing ring; 11-2. Stirring rod; 11-3. Medium tank; 12. Separator; 12-1. Separator fixing ring; 12-2 , separation ring; 13, coaxial changing direction transmission mechanism; 13-1, stirring shaft bevel gear; 13-2, hollow shaft bevel gear; 13-3, hollow shaft; 13-4, changing direction transmission bevel gear; 13-5, gear seat; 13-6, sealing cover; 13-7, hollow shaft bearing; 13-8, sealing cover bearing; 14, forward grinding agitator; 14-1, grinding fixed ring; 14-2, grinding stirring ring; 15, reverse grinding agitator; 16, hole-adjustable separation device; 16-1, outer sieve plate; 16-2, inner sieve plate; 16-3, annular sealing plate; 16-4, fixed threaded column; 16-5, fastening ring; 16-6, nut; 17, cylinder separation ring; 18, annular sealing ring. DETAILED DESCRIPTION

[0053] 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.

[0054] 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.

[0055] 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.

[0056] Example

[0057] See also Figures 1 to 9 An embodiment of the present invention provides a stirred mill with high particle size adaptability, including a grinding cylinder 1, a feeding port, a discharge port 3, a mill air inlet 7, a mill air outlet 8, a stirring shaft 5, a driving device 4, a separating device and a cooling device 9.

[0058] The grinding cylinder 1 is supported and fixed by a foundation and a bracket 6. A feeding port and a mill air inlet 7 are provided at one end of the grinding cylinder 1, and a discharge port 3 and a mill air outlet 8 are provided at the other end. The stirring shaft 5 is a high-speed shaft. One end of the stirring shaft 5 is connected to the driving device 4, and the other end passes through the grinding cylinder 1 along the axis of the grinding cylinder 1 and is supported by a bearing installed on the foundation and the bracket 6.

[0059] The grinding drum 1 consists of a cylinder and end caps, which are bolted to the cylinder. Both the cylinder and the end caps are split-piece structures, each divided into multiple sections that are bolted together. Specifically, the cylinder and end caps are each divided horizontally into upper and lower sections, which are bolted together to facilitate disassembly and maintenance of the mill interior. The length-to-diameter ratio of the grinding drum 1 is 1.5 to 8, and the grinding drum 1 is arranged horizontally. In this embodiment, the grinding drum 1 is 6000 mm long and 2600 mm in diameter.

[0060] The feeding port is arranged at the upper part of the end cover on one side of the grinding cylinder 1, and an air-locking feeding device 2 is provided at the feeding port. The air-locking feeding device 2 allows the material to enter the grinding cylinder 1 at an angle of 45° to 75° with the horizontal direction; the air-locking feeding device 2 includes a feeder outer shell 2-1, a feeder inner shell 2-2, an air-locking plate 2-3 and a heavy hammer 2-5. The lower part of the feeder inner shell 2-2 extends into the feeder outer shell 2-1, and the air-locking plate 2-3 is placed in the feeder outer shell 2-1 and is located below the feeder inner shell 2-2. The air lock plate 2-3 is fixedly connected to the weight 2-5 and is mounted on the feeder outer shell 2-1 via the rotating shaft 2-4. When no material is passing through, the air lock plate 2-3, under the action of the weight 2-5, fits against the bottom end surface of the feeder inner shell 2-2, i.e., the angle between the air lock plate 2-3 and the horizontal direction decreases, blocking the feeding channel. When material is passing through, the weight of the material causes the air lock plate 2-3 to separate from the bottom end surface of the feeder inner shell 2-2, i.e., the angle between the air lock plate 2-3 and the horizontal direction increases, opening the feeding channel and allowing the material to pass smoothly. In this embodiment, the material enters the grinding cylinder 1 at an angle of 60° to the horizontal direction.

[0061] The discharge port 3 is arranged at the bottom of the grinding cylinder 1 to facilitate the rapid discharge of separated materials.

[0062] The mill air inlet 7 is arranged at the upper part of the grinding cylinder 1 and is connected to the upper wall of the grinding cylinder 1. The air inlet direction forms an angle of 15° to 45° with the horizontal direction. Air holes are evenly opened on the wall of the grinding cylinder 1 in the ventilation area. The diameter of the air holes is 0.1 to 0.9 times the diameter of the grinding medium. In this embodiment, the air inlet direction forms an angle of 30° with the horizontal direction, and the diameter of the air holes is 2 mm. The air holes can evenly supply air into the grinding cylinder 1 while avoiding interference of the grinding medium on the air duct.

[0063] The mill air outlet 8 is provided at the upper portion of the end cover on the discharge side of the grinding cylinder 1 . The mill air outlet 8 is arranged horizontally, and the downstream of the mill air outlet 8 is connected to the dust collecting equipment.

[0064] The driving device 4 is arranged at one end of the feeding side of the grinding drum 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 drive mode is preferably adopted.

[0065] The grinding cylinder 1 is provided with a crushing zone and a grinding zone in sequence from the feed inlet to the discharge outlet 3. A partition plate 12 is provided between the crushing zone and the grinding zone, dividing the grinding cylinder 1 into a crushing zone near the feed end and a grinding zone near the discharge end. A material guide agitator 10 and multiple crushing agitators 11 are provided on the stirring shaft 5 in the crushing zone in sequence from the feed end to the discharge end. A material guide agitator 10, multiple grinding agitators, and a separation device for separating the ground material from the grinding media are provided on the stirring shaft 5 in the grinding zone in sequence from the feed end to the discharge end. The diameter and density of the grinding media in the crushing zone are both greater than those in the grinding zone, and the filling rate of the grinding media in the crushing zone is less than that in the grinding zone. The crushing zone is filled with 5-20 mm spherical grinding media, with a grinding media filling rate of 30% to 70%. The grinding zone is filled with 2-10 mm spherical grinding media, with a grinding media filling rate of 50% to 90%. In this embodiment, the crushing zone in the grinding cylinder 1 is 1500 mm long; the crushing zone is filled with 10 mm spherical grinding media, with a medium filling rate of 45%; the grinding zone is filled with 6 mm spherical grinding media, with a medium filling rate of 70%. The density of the grinding media is determined by the material of the grinding media. The material and density of the commonly used grinding media are: alumina balls (3.65 g / cm 3 ), zirconium silicate balls (4g / cm 3 ), zirconia balls (6g / cm 3 ), steel ball (7.8g / cm 3 ) and so on. The greater the density of the grinding medium, the greater the impact force, and the more conducive it is to impact crushing.

[0066] The separating disk 12 is fixed on the stirring shaft 5 and rotates with the stirring shaft 5. It is a split structure and is divided into multiple annular disk bodies from the inside to the outside in the radial direction, which are a separating fixing ring 12-1 and multiple separating rings 12-2 in sequence. The separating fixing ring 12-1 is fixed on the stirring shaft 5, and the separating ring 12-2 adjacent to the separating fixing ring 12-1 and the separating fixing ring 12-1, as well as the two adjacent separating rings 12-2, are all connected and fixed by radial bolts. Specifically, the separating ring 12-2 adjacent to the separating fixing ring 12-1 is fixed to the separating fixing ring 12-1 by radial bolts, and the large-diameter separating ring 12-2 is fixed to the adjacent small-diameter separating ring 12-2 by radial bolts. According to the above method, the separating fixing ring 12-1 and each separating ring 12-2 are fixedly combined in sequence to form a complete separating disk 12, which is convenient for disassembly and maintenance; each separating ring 12-2 is divided into at least two parts, which is easy to disassemble and assemble.

[0067] The distance between the outer edge of the separating disk 12 and the inner wall of the grinding cylinder 1 is 0.1 to 0.8 times the diameter of the grinding medium in the grinding area; a plurality of arc-shaped sieve holes are evenly arranged on the disk surface of the separating disk 12 along the circumferential direction. In this embodiment, a plurality of arc-shaped sieve holes are evenly arranged on each separating ring 12-2 along the circumferential direction. The width of the sieve holes is 0.1 to 0.5 times the diameter of the grinding medium in the grinding area, and the total passing area on the disk surface accounts for 0.4 to 0.8; the edge of the separating disk 12 cooperates with the cylindrical separating ring 17 provided on the inner wall of the grinding cylinder 1 to form a seal to prevent the grinding medium from passing through, and only allows materials of a certain particle size to pass through the sieve holes. The gap between the separating disk 12 and the cylindrical separating ring 17 is 0.1 to 0.4 times the diameter of the grinding medium in the grinding area. In this embodiment, the separation plate 12 is divided into one separation fixing ring 12-1 and two separation rings 12-2. Each separation ring 12-2 is divided into two parts. The gap between the separation plate 12 and the cylinder separation ring 17 is 2 mm. The distance between the separation plate 12 and the inner wall of the grinding cylinder 1 is 3 mm. The total area of ​​the screening holes on the plate surface is 2.5 m 2 , the sieve hole width is 3mm.

[0068] The material guide agitator 10 in the crushing zone is arranged near the feeding port, and the material guide agitator 10 in the grinding zone is arranged near the separating disk 12. The two material guide agitators 10 are both fixed on the stirring shaft 5. The two have the same structure and are both blade-type agitators, consisting of a material guide fixing ring 10-1 and a plurality of blades 10-2. The material guide fixing ring 10-1 is fixed on the stirring shaft 5, and fixing holes are evenly distributed on the outer circumference of the material guide fixing ring 10-1; the blades 10-2 are fixed on the material guide fixing ring 10-1 through the fixing holes, and the blades 10-2 are long strips with a wide head and a narrow bottom. The head of the blade 10-2 is an arc shape, and a fixing seat and a bolt column are provided at the bottom of the blade 10-2, and the bolt column is connected and fixed with the fixing hole; the angle between the blade 10-2 and the radial direction of the material guide agitator 10 is 60° to 85°, and the distance between the top of the blade 10-2 and the inner wall of the grinding cylinder 1 is 5 to 15 times the diameter of the grinding medium in the grinding zone. In this embodiment, the included angle between blade 10-2 and the radial direction of the control agitator is 85°, and the distance between blade 10-2 and the inner wall of grinding drum 1 is 60 mm. During operation, the angled blade 10-2 can generate a thrust in the discharge direction for the material in its area, accelerating its movement. The material guide agitator 10 located near the feed inlet quickly moves the newly fed material into grinding drum 1 for crushing and grinding. The material guide agitator 10 located near the separator 12 provides discharge space and a slight negative pressure on the discharge side of the separator 12, allowing materials of a certain particle size to quickly pass through the separator 12 and move toward the grinding agitator.

[0069] The crushing agitator 11 is fixed to the agitator shaft 5 and is a rod-type agitator consisting of a crushing fixed ring 11-1 and multiple agitating rods 11-2. The crushing fixed ring 11-1 is fixed to the agitator shaft 5 and has fixing holes evenly distributed on its outer circumference. The agitating rods 11-2 are fixed to the crushing fixed ring 11-1 through the fixing holes. The diameter of the head of each agitating rod 11-2 is larger than the diameter of the bottom, and the head is hemispherical. The material-facing surface of each agitating rod 11-2 is provided with a long strip of medium groove 11-3 along the radial direction of the crushing agitator 11. The bottom of each agitating rod 11-2 is provided with a bolt column, which is connected to the fixing hole. The distance between the outer edge of the crushing agitator 11 and the inner wall of the grinding cylinder 1 is 2 to 10 times the diameter of the grinding medium in the crushing zone. In this embodiment, the distance between the crushing agitator 11 and the inner wall of the grinding cylinder 1 is 20 mm. During operation, the crushing agitator 11 comes into face-to-face contact with the grinding medium and the material, and can directly apply impact force to the grinding medium and the material, which is beneficial to the crushing of large particles of material. The medium groove 11-3 arranged on the material-facing surface can be filled with grinding medium, and the grinding medium and the grinding medium are in contact during rotation, thereby reducing the wear of the crushing agitator 11 itself.

[0070] The distance between the outer edge of the grinding agitator and the inner wall of the grinding cylinder 1 is 2 to 10 times the diameter of the grinding medium in the grinding area; the disk surface of the grinding agitator is evenly provided with multiple through holes along the circumferential direction. In this embodiment, each grinding agitator ring 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 grinding agitator is divided into one grinding fixed ring 14-1 and two grinding agitator rings 14-2. The distance between the grinding agitator and the inner wall of the grinding cylinder 1 is 24mm, that is, the diameter of the grinding agitator is 2452mm, and the through area on the grinding agitator disk is 2m 2 .

[0071] The grinding agitator is divided into a forward grinding agitator 14 and a reverse grinding agitator 15. The forward grinding agitator 14 and the reverse grinding agitator 15 are arranged in a cross-like and uniform manner along the stirring shaft 5. The forward grinding agitator 14 is fixed on the stirring shaft 5 and rotates in the same direction as the stirring shaft 5. The reverse grinding agitator 15 is installed on the stirring shaft 5 through a coaxial direction-changing transmission mechanism 13, so that the forward and reverse grinding agitators can rotate in different directions under the action of the stirring shaft 5 and the coaxial direction-changing transmission mechanism 13.

[0072] The coaxial direction-changing transmission mechanism 13 is composed of a stirring shaft bevel gear 13-1, two direction-changing transmission bevel gears 13-4, a hollow shaft bevel gear 13-2, a hollow shaft 13-3 and a sealing cover 13-6. The stirring shaft bevel gear 13-1 is fixed on the stirring shaft 5 and rotates in the same direction as the stirring shaft 5. The two direction-changing transmission bevel gears 13-4 are symmetrically arranged on both sides of the stirring shaft 5 and mesh with the stirring shaft bevel gear 13-1 at 90 degrees; the hollow shaft bevel gear 13-2 is fixed on the hollow shaft 13-3 and meshes with the two direction-changing transmission bevel gears 13-4 at 90 degrees. The two ends of the hollow shaft 13-3 are coaxially mounted on the stirring shaft 5 through hollow shaft bearings 13-7, so that the hollow shaft 13-3 does not rotate with the stirring shaft 5; each The direction-changing transmission bevel gear 13-4 is respectively supported by the gear seat 13-5 installed in the sealing cover 13-6. The stirring shaft bevel gear 13-1, the two direction-changing transmission bevel gears 13-4, and the hollow shaft bevel gear 13-2 are all sealed in the sealing cover 13-6. The two ends of the sealing cover 13-6 are respectively connected to the stirring shaft 5 and the hollow shaft 13-3 through the sealing cover bearings 13-8. The sealing cover 13-6 does not rotate with the two shafts. The sealing cover 13-6 is a cylindrical structure; the reverse grinding agitator 15 is fixed on the hollow shaft 13-3 located outside the sealing cover 13-6. Under the action of the coaxial direction-changing transmission mechanism 13, the hollow shaft 13-3 rotates in the opposite direction to the stirring shaft 5, driving the reverse grinding agitator 15 to rotate in the opposite direction. Driven by the agitator shaft 5, the agitator shaft bevel gear 13-1 rotates, which in turn drives the two meshing bevel gears 13-4, which in turn transmit the opposite direction of rotation to the hollow shaft bevel gear 13-2. The hollow shaft bevel gear 13-2 then drives the hollow shaft 13-3 and the reverse grinding agitator 15 on the hollow shaft 13-3 to rotate in the opposite direction of the agitator shaft 5. All gears of the coaxial direction-changing transmission mechanism 13 are sealed in a cylindrical sealing cover 13-6, which protects each gear and ensures stable operation.

[0073] The forward grinding agitator 14 and the reverse grinding agitator 15 have the same structure, both of which are disc agitators. The disc agitator is a split structure, which is divided into multiple annular discs from the inside to the outside in the radial direction, namely a grinding fixed ring 14-1 and multiple grinding stirring rings 14-2. The grinding fixed ring 14-1 is fixed to the stirring shaft 5, and the grinding stirring ring 14-2 adjacent to the grinding fixed ring 14-1 and the grinding fixed ring 14-1, as well as the two adjacent grinding stirring rings 14-2, are all connected and fixed by radial bolts. Specifically, the grinding stirring ring 14-2 adjacent to the grinding fixed ring 14-1 is fixed to the grinding fixed ring 14-1 by radial bolts, and the large-diameter grinding stirring ring 14-2 is fixed to the adjacent small-diameter grinding stirring ring 14-2 by radial bolts. According to the above method, the grinding fixed ring 14-1 and each grinding stirring ring 14-2 are fixedly combined in sequence to form a complete grinding agitator, which is convenient for disassembly and maintenance; each of the grinding stirring rings 14-2 is divided into at least two parts, which is easy to disassemble and assemble.

[0074] The separation device is a hollow hemispherical structure, and the sieve plate is in the form of a hollow hemispherical shape. Compared with other forms, it has a larger contact area with the material; and it is a separation device with adjustable hole spacing, so that the sieve hole size and screening area can be controlled.

[0075] The small diameter end of the adjustable-pitch separation device 16 is detachably fixed to the stirring shaft 5, and the large diameter end forms a labyrinth seal with the grinding cylinder 1 to prevent the grinding medium from passing through; the adjustable-pitch separation device 16 is composed of an outer sieve plate 16-1 and an inner sieve plate 16-2, the inner sieve plate 16-2 is placed on the inner side of the outer sieve plate 16-1 and fits with the outer sieve plate 16-1, the outer sieve plate 16-1 is detachably mounted on the stirring shaft 5 and rotates with the shaft, specifically, the small end of the outer sieve plate 16-1 is provided with an annular support for fixing to the stirring shaft 5, and the fixing method adopts a detachable fixation by means of keyways, bolts, etc. The inner sieve plate 16-2 is rotatable relative to the outer sieve plate 16-1. Each sieve plate has circular or elongated sieve holes on its surface. The openings of the inner sieve plate 16-2 and the outer sieve plate 16-1 are identical in position and shape. The diameter or width of the sieve holes is 0.5 to 0.9 times the diameter of the grinding media in the grinding zone. In this embodiment, elongated sieve holes are used, and the width of the sieve holes is 3 mm.

[0076] The outer sieve plate 16-1 is provided with an annular sealing plate 16-3 at the large diameter end edge, and the cross section of the annular sealing plate 16-3 is "L" shaped. An annular sealing ring 18 is provided on the inner wall of the grinding cylinder 1, and the annular sealing ring 18 has a U-shaped sealing groove. The plate parallel to the axial direction in the annular sealing plate 16-3 cooperates with the annular sealing ring 18 to form a sealing area to prevent the grinding medium from passing through; the inner sieve plate 16-2 is provided with a fastening ring 16-5 at the large diameter end edge, and a plurality of arc-shaped strips are evenly opened on the fastening ring 16-5 along the circumferential direction. The annular sealing plate 16-3 has a plurality of fixed threaded posts 16-4 arranged evenly along the circumferential direction on a plate perpendicular to the axial direction for cooperating with the arc-shaped elongated through-holes. The diameter of the fixed threaded posts 16-4 matches the width of the arc-shaped elongated through-holes. The fixed threaded posts 16-4 can move within the arc-shaped elongated through-holes, allowing the inner sieve plate 16-2 to rotate relative to the outer sieve plate 16-1. The fixed threaded posts 16-4 pass through the arc-shaped elongated through-holes and are fastened by nuts 16-6, thereby fixing the inner sieve plate 16-2 and the outer sieve plate 16-1. During installation, the fixed threaded posts 16-4 of the outer sieve plate 16-1 pass through the arc-shaped elongated through-holes of the inner sieve plate 16-2 and are then fastened by nuts. By adjusting the relative position of the fixed threaded column 16-4 and the arc-shaped long through hole, the inner sieve plate 16-2 can be rotated relative to the outer sieve plate 16-1. The solid area of ​​the inner sieve plate 16-2 blocks the sieve holes of the outer sieve plate 16-1, thereby reducing the overall screening area.

[0077] A cooling device 9 is provided on the periphery of the grinding cylinder 1; the cooling device 9 includes a cooling shell 9-1 and heat sinks 9-2, and an interlayer is formed between the cooling shell 9-1 and the cylindrical body of the grinding cylinder 1, and a plurality of heat sinks 9-2 are fixed on the outer wall of the cylindrical body of the grinding cylinder 1 in the interlayer to increase the heat dissipation area; a plurality of heat sinks 9-2 are also provided on the outer surface of the cooling shell 9-1 to increase the heat dissipation area and improve the heat dissipation speed; a cooling medium inlet 9-3 is provided at the lower part of the cooling shell 9-1 located at the discharge end side, and a cooling medium outlet 9-4 is provided at the upper part of the cooling shell 9-1 located at the feed end side, and the cooling medium flows in the interlayer to cool the grinding cylinder 1 as a whole and take away the heat of the mill; the cooling device 9 is a split structure corresponding to the cylinder of the grinding cylinder 1, which is consistent with the split design of the cylinder and is divided into upper and lower parts.

[0078] The specific operation process of the stirring mill of the present invention is as follows:

[0079] Drive unit 4 rotates agitator shaft 5, which in turn drives guide agitator 10, crushing agitator 11, separator plate 12, and forward grinding agitator 14 mounted thereon to rotate in the same direction as agitator shaft 5. Simultaneously, this drives coaxial direction-changing transmission mechanism 13 mounted on agitator shaft 5, which in turn drives reverse grinding agitator 15 to rotate in the opposite direction of agitator shaft 5. Material is fed into grinding drum 1 through airlock feeder 2 located above one end of grinding drum 1. It first enters the crushing zone, where it is rapidly driven by the corresponding guide agitator 10 toward crushing agitator 11 within the mill. The impact of the grinding media driven by crushing agitator 11 causes rapid crushing. Once crushed to a desired fineness, the material passes through separator plate 12 and enters the grinding zone. Driven by the corresponding guide agitator 10, the material of a certain particle size is rapidly forced through separator plate 12 and toward the grinding agitator. Under the high-speed forward and reverse rotation of the two grinding agitators, the material and the grinding media undergo multi-dimensional circular motion and rotational movement. Material particles are crushed by the grinding media, which primarily utilizes friction and shear forces. Cold air is introduced into the mill air inlet 7 on the feeding end side. The material is gradually moved to the discharge end by the wind force and stirring, and then the qualified particle size product and the grinding medium are separated by the adjustable hole spacing separator 16. The grinding medium is blocked by the separator and remains in the grinding barrel 1. The ground material can be discharged through the separator. The adjustable hole spacing separator 16 can flexibly adjust the screening aperture, thereby adjusting the grinding time of the material in the mill by adjusting the discharge speed, and flexibly adjusting the fineness of the milled product. The qualified product discharged by the separator is discharged through the discharge port 3. The cold air introduced into the grinding barrel 1 passes through the separator and is discharged through the air outlet above the discharge port 3. A combined assembled cooling device 9 is set on the outer wall of the grinding barrel 1 to ensure continuous cooling and temperature reduction under long-term operation of the equipment.

[0080] 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 stirred mill with high particle size adaptability, comprising a grinding drum, a feed port, a discharge port, a mill air inlet, a mill air outlet, a stirring shaft, a driving device, a separating device, and a cooling device; the grinding drum is supported and fixed by a base and a bracket, with the feed port and the mill air inlet provided at one end of the grinding drum, and the discharge port and the mill air outlet provided at the other end; one end of the stirring shaft is connected to the driving device, and the other end passes through the grinding drum along the axis of the grinding drum and is supported by a bearing mounted on the base and the bracket; a cooling device is provided on the periphery of the grinding drum; and the characteristics are: The grinding cylinder is provided with a crushing zone and a grinding zone in sequence from the feed port to the discharge port, and a partition plate is provided between the crushing zone and the grinding zone; a material guide stirrer and multiple crushing stirrers are provided on the stirring shaft in the crushing zone in sequence from the feed port to the discharge port; a material guide stirrer, multiple grinding stirrers and a separation device for separating the ground material and the grinding medium are provided on the stirring shaft in the grinding zone in sequence from the feed port to the discharge port; the diameter and density of the grinding medium in the crushing zone are both greater than those in the grinding zone, and the filling rate of the grinding medium in the crushing zone is less than that in the grinding zone; The grinding stirrer is divided into a forward grinding stirrer and a reverse grinding stirrer. The forward grinding stirrer and the reverse grinding stirrer are arranged uniformly and crosswise along the stirring shaft. The forward grinding stirrer is fixed on the stirring shaft, and the reverse grinding stirrer is installed on the stirring shaft through a coaxial direction-changing transmission mechanism, so that the forward and reverse grinding stirrers can rotate in different directions under the action of the stirring shaft and the coaxial direction-changing transmission mechanism. The separation device is a hollow hemispherical structure and is a separation device with adjustable hole spacing, so that the size of the sieve holes and the screening area can be controlled.

2. The stirred mill with high particle size adaptability according to claim 1, characterized in that The material guide agitator in the crushing zone is arranged near the feeding port, and the material guide agitator in the grinding zone is arranged near the separating disk. The two material guide agitators are fixed on the stirring shaft, and the two have the same structure. Both are blade-type agitators, consisting of a material guide fixing ring and a plurality of blades. The material guide fixing ring is fixed on the stirring shaft, and fixing holes are evenly distributed on the outer circumference of the material guide fixing ring; the blades are fixed on the material guide fixing ring through the fixing holes, and the blades are long strips with a wide head and a narrow bottom. The head of the blade is an arc shape, and a fixing seat and a bolt column are provided at the bottom of the blade. The bolt column is connected and fixed to the fixing hole; the distance between the top of the blade and the inner wall of the grinding cylinder is 5 to 15 times the diameter of the grinding medium in the grinding zone.

3. The stirred mill with high particle size adaptability according to claim 1, characterized in that The crushing agitator is fixed on the agitator shaft and is a rod-type agitator, consisting of a crushing fixed ring and multiple stirring rods. The crushing fixed ring is fixed on the agitator shaft, and fixing holes are evenly distributed on the outer circumference of the crushing fixed ring; the stirring rods are fixed to the crushing fixed ring through the fixing holes; the head diameter of the stirring rod is larger than the bottom diameter, and the head is hemispherical; the material-facing surface of the stirring rod is provided with a long strip medium groove along the radial direction of the crushing agitator, and a bolt column is provided at the bottom of the stirring rod, and the bolt column is connected and fixed with the fixing hole; the distance between the outer edge of the crushing agitator and the inner wall of the grinding cylinder is 2 to 10 times the diameter of the grinding medium in the crushing area.

4. The stirred mill with high particle size adaptability according to claim 1, characterized in that The separating disk is fixed on the stirring shaft and has a split structure. It is divided into multiple annular disk bodies from the inside to the outside in the radial direction, which are a separating fixed ring and multiple separating rings in sequence. The separating fixed ring is fixed on the stirring shaft. The separating fixed rings adjacent to the separating fixed ring and the separating fixed rings, as well as the two adjacent separating rings, are all connected and fixed by radial bolts, so that the separating fixed ring and each separating ring are fixedly combined in sequence to form a complete separating disk; each of the separating rings is divided into at least two parts.

5. The stirred mill with high particle size adaptability according to claim 1, characterized in that The distance between the outer edge of the separating disk and the inner wall of the grinding cylinder is 0.1 to 0.8 times the diameter of the grinding medium in the grinding area; a plurality of arc-shaped sieve holes are evenly arranged on the surface of the separating disk along the circumferential direction, the width of the sieve holes is 0.1 to 0.5 times the diameter of the grinding medium in the grinding area, and the total passing area on the disk surface accounts for 0.4 to 0.8; the edge of the separating disk cooperates with the cylinder separating ring provided on the inner wall of the grinding cylinder to form a seal, and the gap between the separating disk and the cylinder separating ring is 0.1 to 0.4 times the diameter of the grinding medium in the grinding area.

6. The stirred mill with high particle size adaptability according to claim 1, characterized in that The forward grinding agitator and the reverse grinding agitator have the same structure, both of which are disc-type agitators. The disc-type agitator is a split structure, which is divided into multiple annular discs from the inside to the outside in the radial direction, which are a grinding fixed ring and multiple grinding stirring rings in sequence. The grinding fixed ring is fixed to the stirring shaft, and the grinding stirring ring adjacent to the grinding fixed ring and the grinding fixed ring, as well as the two adjacent grinding stirring rings, are all connected and fixed by radial bolts, so that the grinding fixed ring and each grinding stirring ring are fixedly combined in sequence to form a complete grinding agitator; each of the grinding stirring rings is divided into at least two parts.

7. The stirred mill with high particle size adaptability according to claim 1, characterized in that The distance between the outer edge of the grinding agitator and the inner wall of the grinding cylinder is 2 to 10 times the diameter of the grinding medium in the grinding area; a plurality of through holes are evenly arranged on the disk surface of the grinding agitator along the circumferential direction, and the total through area on the disk surface accounts for 0.2 to 0.

6.

8. The stirred mill with high particle size adaptability according to claim 1, characterized in that The coaxial direction-changing transmission mechanism consists of a stirring shaft bevel gear, two direction-changing transmission bevel gears, a hollow shaft bevel gear, a hollow shaft and a sealing cover. The stirring shaft bevel gear is fixed on the stirring shaft, and the two direction-changing transmission bevel gears are symmetrically arranged on both sides of the stirring shaft and mesh with the stirring shaft bevel gear at 90 degrees; the hollow shaft bevel gear is fixed on the hollow shaft and meshes with the two direction-changing transmission bevel gears at 90 degrees, and the two ends of the hollow shaft are coaxially mounted on the stirring shaft through hollow shaft bearings; each of the direction-changing transmission bevel gears is rotatably supported by a gear seat installed in the sealing cover, and the stirring shaft bevel gear, the two direction-changing transmission bevel gears, and the hollow shaft bevel gear are all sealed in the sealing cover, and the two ends of the sealing cover are connected to the stirring shaft and the hollow shaft through sealing cover bearings respectively; the reverse grinding agitator is fixed on the hollow shaft located outside the sealing cover. Under the action of the coaxial direction-changing transmission mechanism, the hollow shaft rotates in the opposite direction to the stirring shaft, driving the reverse grinding agitator to rotate in the opposite direction.

9. The stirred mill with high particle size adaptability according to claim 1, characterized in that The small diameter end of the adjustable hole spacing separation device is detachably fixed to the stirring shaft, and the large diameter end forms a labyrinth seal with the grinding cylinder; the adjustable hole spacing separation device is composed of an outer sieve plate and an inner sieve plate, the inner sieve plate is placed on the inner side of the outer sieve plate and fits with the outer sieve plate, the outer sieve plate is detachably installed on the stirring shaft and rotates with the shaft, and the inner sieve plate can rotate relative to the outer sieve plate; each sieve plate surface is provided with circular sieve holes or long strip sieve holes, the opening position and shape of the inner sieve plate and the outer sieve plate are consistent, and the diameter or width of the sieve hole is 0.5~0.9 times the diameter of the grinding medium in the grinding area.

10. The stirred mill with high particle size adaptability according to claim 9, characterized in that An annular sealing plate is provided at the large diameter end edge of the outer sieve plate, and the cross-section of the annular sealing plate is "L"-shaped. An annular sealing ring is provided on the inner wall of the grinding cylinder, and the plate in the annular sealing plate parallel to the axial direction cooperates with the annular sealing ring to form a sealing area; a fastening ring is provided at the large diameter end edge of the inner sieve plate, and a plurality of arc-shaped long through holes are evenly opened on the fastening ring along the circumferential direction, and a plurality of fixed threaded columns for cooperating with the arc-shaped long through holes are evenly provided on the plate in the annular sealing plate perpendicular to the axial direction along the circumferential direction, and the diameter of the fixed threaded column matches the width of the arc-shaped long through hole, and the fixed threaded column can move in the arc-shaped long through hole so that the inner sieve plate can be rotated relative to the outer sieve plate, and the fixed threaded column passes through the arc-shaped long through hole and is fastened by a nut to fix the inner sieve plate and the outer sieve plate.

11. The stirred mill with high particle size adaptability according to claim 1, characterized in that: The cooling device includes a cooling shell and heat sinks, wherein an interlayer is formed between the cooling shell and the grinding cylinder body, and a plurality of heat sinks are fixed on the outer wall of the grinding cylinder body in the interlayer; a plurality 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 at the discharge end side, and a cooling medium outlet is provided at the upper part of the cooling shell located at the feed end side, and the cooling medium flows in the interlayer; the cooling device is a split structure corresponding to the cylinder of the grinding cylinder.

12. The stirred mill with high particle size adaptability according to claim 1, characterized in that: The grinding cylinder 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 combined by bolts.

13. The stirred mill with high particle size adaptability according to claim 1, characterized in that The ratio of the length to the diameter of the grinding cylinder is 1.5-8, and the grinding cylinder is arranged horizontally; the crushing zone is filled with 5-20 mm spherical grinding media, and the filling rate of the grinding media is 30%-70%; the grinding zone is filled with 2-10 mm spherical grinding media, and the filling rate of the grinding media is 50%-90%.

14. The stirred mill with high particle size adaptability according to claim 1, characterized in that The feeding port is provided at the upper part of the end cover on one side of the grinding cylinder, and an air-locking feeding device is provided at the feeding port, and the air-locking feeding device allows the material to enter the grinding cylinder at an angle of 45° to 75° with the horizontal direction; 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 is fitted 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.

15. The stirred mill with high particle size adaptability according to claim 1, characterized in that The discharge port is arranged at the bottom of the grinding cylinder body.

16. The stirred mill with high particle size adaptability according to claim 1, characterized in that The mill air inlet is arranged at the upper part of the grinding cylinder and connected to the upper wall of the grinding cylinder. The air inlet direction forms an angle of 15° to 45° with the horizontal direction. Air holes are evenly opened on the wall of the grinding cylinder in the ventilation area. The diameter of the air holes is 0.1 to 0.9 times the diameter of the grinding medium.

17. The stirred mill with high particle size adaptability 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 grinding cylinder, the mill air outlet is arranged horizontally, and the downstream of the mill air outlet is connected to the dust collecting equipment.

18. The stirred mill with high particle size adaptability according to claim 1, characterized in that The driving device is arranged at one end of the feeding side of the grinding cylinder and adopts a permanent magnet direct drive or a motor acceleration and reduction gear drive mode.

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