A vertical spiral stirring mill device

Abstract

This invention relates to a vertical spiral stirred mill device. By designing the spiral stirrer blades into a conical, involute structure, the stirring ability of the stirrer to push the media balls at the bottom of the cylinder is improved. A biomimetic spiral stirring frame with inner and outer blades is designed on the outside of the spiral stirrer inside the cylinder, which realizes the self-grading of the media balls while driving the media balls to grind the slurry particles. This works in conjunction with the spiral stirrer to increase the collision frequency of the media balls. At the same time, a cylinder bottom anti-deviation system is designed to solve the problem of the stirrer's swaying inside the cylinder. Overall, the grinding efficiency and service life of the vertical spiral stirred mill device are improved.

Description

Technical Field

[0001] This invention relates to the field of grinding equipment technology, specifically to a vertical spiral stirring mill device. Background Technology

[0002] Vertical spiral stirred mills are highly efficient ultrafine grinding equipment, typically consisting of a cylinder, a spiral agitator, and a drive motor. Driven by the motor, the spiral agitator stirs the grinding media balls and slurry mixture within the cylinder. Through the continuous collision, compression, and friction of the grinding media balls, the slurry particles are refined. Compared to traditional horizontal ball mills, vertical spiral stirred mills offer advantages such as high efficiency and energy saving, low noise, small footprint, short installation period, long service life, and high reliability.

[0003] Existing vertical spiral stirred mills are single-chamber grinding chambers, offering only a single grinding fineness and lacking classification capabilities. Furthermore, the grinding media balls near the inner wall and bottom of the chamber are not directly driven by the agitator blades, resulting in low grinding efficiency for the slurry. Additionally, the upper end of the agitator shaft in current vertical spiral stirred mills is connected to the drive system via a bearing, while the lower end is free. During operation, uneven distribution of the grinding media balls within the chamber causes the free end to wobble. Severe wobble can directly damage the bearing structure, leading to equipment failure. Therefore, it is necessary to explore new vertical spiral stirred mill devices to address the problems of existing vertical spiral stirred mills, such as the lack of classification capabilities in the grinding chamber, the need for further improvement in working efficiency, and the wobble of the agitator. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a vertical spiral stirring mill device. Through the design of conical involute spiral blades, a biomimetic spiral stirring frame, and a bottom anti-deviation system, the grinding chamber is graded, which effectively improves the grinding efficiency and solves the problem of the stirrer's sway within the cylinder.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A vertical spiral stirring mill device includes a cylindrical body with a vertical central stirring shaft in the middle. Spiral blades are coiled on the central stirring shaft to form a spiral stirrer. The outer diameter of the spiral blades gradually increases from top to bottom, forming a tapered involute structure. A spiral stirring frame is provided between the spiral blades and the cylindrical body. The spiral stirring frame has a tapered structure with a smaller top and a larger bottom. The sidewalls of the spiral stirring frame have a mesh structure, and spiral inner and outer blades are respectively provided on the inner and outer sides. The spiral stirring frame divides the interior of the cylindrical body into two grinding chambers. The spiral stirring frame rotates in the opposite direction to the spiral stirrer.

[0007] Furthermore, the grinding chamber located inside the spiral stirring frame is a coarse grinding chamber, and the grinding chamber located outside the spiral stirring frame is a fine grinding chamber. The diameter of the grinding medium in the coarse grinding chamber is larger than that in the fine grinding chamber. The grid structure on the side wall of the spiral stirring frame forms multiple grid holes. The grinding medium in the two grinding chambers is screened by setting the size of the grid holes.

[0008] Furthermore, the inner and outer blades on the spiral stirring frame have the same spiral direction and are opposite to the spiral direction of the spiral blades of the spiral stirrer. The pitch h1 of the spiral blades is slightly larger than the pitch h2 of the inner or outer blades on the spiral stirring frame.

[0009] Furthermore, the tilt angle of the spiral stirring frame is the same as the tilt angle of the spiral blades, and the distance s between the edge of the inner blade on the inner wall of the spiral stirring frame and the edge of the spiral blade of the spiral stirrer satisfies d < s < 2d, where d is the diameter of the grinding medium.

[0010] Furthermore, a drive system is provided above the cylinder. The drive system includes a motor, a planetary gear mechanism, and a planetary carrier. The planetary carrier is fixed at the top of the cylinder, and the motor is located above the planetary carrier. A circular hole is provided in the center of the planetary carrier and a thrust roller bearing is installed thereon. The intermediate stirring shaft passes through the thrust roller bearing and is connected to the motor through a coupling. The planetary gear mechanism is installed below the planetary carrier and transmits power to the planetary gear mechanism through the intermediate stirring shaft, which drives the spiral stirring frame to rotate.

[0011] Furthermore, the planetary gear mechanism includes a sun gear, planetary gears, and an internal gear ring. Multiple planetary gears are disposed between the sun gear and the internal gear ring, meshing with the sun gear and the internal gear ring respectively. The sun gear is mounted on an intermediate stirring shaft, the planetary gears are mounted on a planet carrier, and the internal gear ring is mounted in an annular groove on the inner wall of the cylinder. The intermediate stirring shaft drives the sun gear to rotate through a keyway. The rotation of the sun gear is transmitted to the internal gear ring through the planetary gears. The internal gear ring is connected to the spiral stirring frame, thereby driving the spiral stirring frame to rotate.

[0012] Furthermore, the bottom of the cylinder is provided with a cylinder bottom anti-deviation system, which includes a cylinder bottom tray, an annular guard plate, and a self-aligning bearing. The cylinder bottom tray is fixed to the bottom of the cylinder, and the edge of the cylinder bottom tray has a vertical edge. An annular guard plate is fixed on the cylinder bottom tray. The outer diameter of the annular guard plate is smaller than the inner diameter of the vertical edge of the cylinder bottom tray, forming an annular gap between them. The cross-section of the annular guard plate is inverted "L" shape. The annular guard plate is fixed to the middle of the cylinder bottom tray through a vertical section, and a circular hole is formed inside the vertical section. A self-aligning bearing is installed in the circular hole. The outer ring of the self-aligning bearing is interference-fitted with the hole wall of the circular hole. The lower end of the intermediate stirring shaft is installed in the inner ring of the self-aligning bearing and is interference-fitted with the inner ring of the self-aligning bearing.

[0013] Furthermore, a shoulder is provided on the stirring shaft located above the self-aligning bearing. A bearing retainer and a washer are installed between the upper end face of the self-aligning bearing and the shoulder of the intermediate stirring shaft. The bearing retainer is an "L"-shaped retainer. The outer side of the bearing retainer is interference-fitted with the circular hole wall of the protective plate, and the inner hole of the bearing retainer is clearance-fitted with the intermediate stirring shaft. The washer is installed above the bearing retainer and is clearance-fitted with the intermediate stirring shaft. The inner diameter of the washer is smaller than the inner diameter of the bearing retainer, and the outer diameter of the washer is larger than the outer diameter of the vertical section of the bearing retainer.

[0014] Furthermore, a connecting rod support is provided between the annular guard plate and the bottom tray of the cylinder. The connecting rod support consists of a ring and connecting rods. The ring is sleeved outside the vertical section of the annular guard plate and the two are in clearance fit. Multiple connecting rods are fixed radially on the ring, and the ends of the connecting rods are fixedly connected to the annular bottom edge of the spiral stirring frame by bolts.

[0015] Furthermore, the annular bottom edge of the spiral stirring rack covers the annular gap between the annular guard plate and the bottom tray. The annular bottom edge of the spiral stirring rack contacts the vertical edges of the annular guard plate and the bottom tray on the inner and outer sides, respectively, and forms mutually cooperating boss structures on the contact surfaces. The cross-section of the boss structure is trapezoidal.

[0016] Beneficial effects:

[0017] 1. The present invention designs the spiral blades of the spiral stirrer as a conical involute structure, with the outer diameter of the spiral blades gradually increasing from top to bottom, thereby improving the stirrer's ability to lift the medium balls at the bottom of the cylinder and thus improving the grinding efficiency.

[0018] 2. The present invention sets a spiral stirring frame on the outside of the spiral stirrer to divide the inside of the cylinder into two chambers: a coarse grinding chamber and a fine grinding chamber. The spiral stirring frame has several holes. After the media balls are worn to a certain extent, they will enter the fine grinding chamber from the coarse grinding chamber inside the biomimetic spiral stirring frame. The large-diameter media balls work in the coarse grinding chamber and the small-diameter media balls work in the fine grinding chamber, realizing self-grading grinding inside the cylinder.

[0019] 3. The structure of the spiral stirring rack of the present invention is inspired by the shape of a spider web. It has a stable structure and is designed with inner and outer blades, which can drive the spiral motion of the internal and external media balls at the same time. The rotation direction is opposite to that of the spiral stirrer. The combined effect of the two can increase the number of collisions of the media balls in the cylinder and improve the grinding efficiency.

[0020] 4. Based on the dual grinding chamber, this invention designs a cylinder anti-deviation system. Through structures such as self-aligning bearings, cylinder bottom trays, annular guard plates, and connecting rod supports, it ensures that the axis of the spiral agitator and the bionic spiral agitator is aligned, completely solving the problem of agitator swaying inside the cylinder. At the same time, through structures such as bearing retaining rings, annular guard plates, and contact surface bosses, it ensures the sealing effect of the cylinder bottom, effectively preventing slurry from entering the cylinder bottom anti-deviation system. Attached Figure Description

[0021] Figure 1 This is a schematic internal cross-sectional view of a vertical spiral stirring mill device according to the present invention;

[0022] Figure 2 This is a schematic diagram of a grinding system of a vertical spiral stirring mill according to the present invention;

[0023] Figure 3 This is a top view of the planetary gear mechanism of a vertical spiral stirring mill device according to the present invention;

[0024] Figure 4 For the present invention Figure 3 BB cross-sectional diagram;

[0025] Figure 5 This is a schematic diagram of the bottom anti-deviation system of a vertical spiral stirring mill device according to the present invention;

[0026] Figure 6 This is a partial cross-sectional view of the cylinder bottom anti-deviation system of the present invention;

[0027] Figure 7 This is another partial cross-sectional view of the cylinder bottom anti-deviation system of the present invention;

[0028] Figure 8 This is an isometric view of a vertical spiral stirring mill device according to the present invention.

[0029] Figure label:

[0030] 100 Drive System: 101 Motor, 102 Thrust Roller Bearing, 103 Planetary Gear Mechanism, 103-1 Sun Gear, 103-2 First Planetary Gear, 103-3 Second Planetary Gear, 103-4 Third Planetary Gear, 103-5 Internal Gear Ring, 103-6 Planetary Carrier, 103-7 First Set of Connecting Bolts, 103-8 Second Set of Connecting Bolts, 103-9 Flange;

[0031] 200 Coarse Grinding System: 201 Intermediate Stirring Shaft, 202 Spiral Blades;

[0032] 300 fine grinding system, 301 spiral stirring rack, 301-1 mesh holes, 301-2 annular bottom edge, 302 outer blades, 303 inner blades;

[0033] 400 Bottom Anti-deviation System: 401 Bottom Tray, 402 Self-aligning Bearing, 403 Connecting Rod Bracket, 404 Third Set of Connecting Bolts, 405 Bearing Retaining Ring, 406 Washer, 407 Annular Protective Plate, 408 Boss, 409 Annular Gap.

[0034] 500 Flow System: 501 Inlet, 502 Outlet, 503 Grinding Media Ball Inlet, 504 Grinding Gate;

[0035] 600 Support System: 601 Cylinder, 602 Wear-resistant Liner, 603 Annular Groove;

[0036] A is the coarse grinding chamber, and B is the fine grinding chamber. Detailed Implementation

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0038] like Figures 1-8 As shown, a vertical spiral stirring mill device of the present invention includes a drive system 100, a coarse grinding system 200, a fine grinding system 300, a bottom anti-deviation system 400, a flow system 500, and a support system 600; the structure and function of each system are described in detail below.

[0039] like Figure 1 or Figure 8 As shown, the support system 600 includes a cylinder 601 and a wear-resistant liner 602; the flow system 500 includes an inlet 501, an outlet 502, a grinding media ball inlet 503, and a grinding gate 504; the wear-resistant liner 602 is fixedly connected to the inner wall of the cylinder 601 by welding, and a grinding gate 504 is opened on one side of the cylinder wall of the cylinder 601, which is connected to the cylinder 601 by hinge; the inlet 501, outlet 502, and grinding media ball inlet 503 of the flow system 500 are all formed by slots of a certain diameter on the cylinder wall of the cylinder 601, wherein the inlet 501 and outlet 502 are circular holes opened near the bottom and near the top of the cylinder 601, respectively, to realize the entry and exit of slurry; the grinding media ball inlet 503 is formed by a circular hole opened at a certain angle near the top of the cylinder 601 and connected to an inclined feeding pipe, thereby realizing the filling of grinding media balls.

[0040] like Figure 1-2As shown, the coarse grinding system 200 includes an intermediate stirring shaft 201, a spiral blade 202, and a coarse grinding chamber A; the fine grinding system 300 includes a spiral stirring frame 301, outer blades 302, inner blades 303, and a fine grinding chamber B; the coarse grinding system 200 and the fine grinding system 300 together constitute the grinding system of the present invention. The grinding system is arranged inside the cylinder 601. Specifically, a vertical intermediate stirring shaft 201 is provided in the middle of the cylinder 601, and spiral blades 202 are coiled on the intermediate stirring shaft 201. The intermediate stirring shaft 201 and the spiral blades 202 together constitute a spiral stirrer. The outer diameter of the spiral blades 202 gradually increases from top to bottom, forming a tapered involute structure, to improve the lifting capacity of the medium balls at the bottom of the cylinder 601; the spiral blades 202 and A spiral stirring frame 301 is provided between the cylinder bodies 601. The spiral stirring frame 301 has a conical structure that is smaller at the top and larger at the bottom, dividing the interior of the cylinder body 601 into two grinding chambers. The chamber located inside the spiral stirring frame 301 is the coarse grinding chamber A, and the chamber located outside the spiral stirring frame 301 is the fine grinding chamber B. The side wall of the spiral stirring frame 301 has a mesh structure with multiple mesh holes 301-1 distributed on it. The size of the mesh holes 301-1 is set to screen the grinding media balls in the two grinding chambers. The inner and outer walls of the spiral stirring frame 301 are respectively provided with spiral inner blades 303 and outer blades 302. The spiral stirring frame 301 rotates in the opposite direction to the spiral stirrer. The combined effect of the two can increase the number of collisions of the media balls inside the cylinder body 601 and improve the grinding efficiency.

[0041] The conical involute structure of the spiral blade 202 extends outward from top to bottom to a certain tilt angle α, and is conical in side view. The spiral stirring frame 301 has a spiral outer blade 302 welded to the outside and a spiral inner blade 303 welded to the inside. The spiral stirring frame 301 is also conical in side view, and the tilt angle β of the spiral stirring frame 301 is completely consistent with the tilt angle α of the spiral blade 202 to ensure that the two will not interfere or collide during rotation.

[0042] The inner blades 303 and outer blades 302 on the spiral stirring frame 301 have the same spiral direction and are opposite to the spiral direction of the spiral blades 202 of the spiral stirrer. Multiple sets of corresponding inner blades 303 and outer blades 302 are provided on the inner and outer walls of the spiral stirring frame 301. The projection positions of each set of corresponding inner blades 303 and outer blades 302 on the side wall of the spiral stirring frame 301 coincide. The distance s between the edge of the largest diameter blade at the bottom of the spiral blade 202 and the edge of the largest diameter blade at the bottom of the inner blade 303 inside the spiral stirrer 301, and the diameter d of the media balls filled inside the vertical spiral stirring mill system, requires that the distance s satisfy d < s < 2d to avoid the media balls getting stuck between the blades of the spiral stirrer and the spiral stirring frame 301; the pitch h1 of the spiral blade 202 should be slightly larger than the pitch h2 of the inner blade 303 or the outer blade 302 on the spiral stirring frame 301; the spiral stirring frame 301 has a grid structure and can be welded from several steel bars during manufacturing. In the illustrated embodiment, the spiral stirring frame 301 has several quadrilateral grid holes 301-1 distributed circumferentially from top to bottom (the size of the grid holes varies in the figure due to modeling, but in reality, the size of each grid hole is the same). If the side length of each grid hole 301-1 is... l The side length is usually required. l The diameter is 3 / 5 of the grinding media ball diameter to ensure that the diameter of the grinding media ball continuously decreases due to wear after working in the coarse grinding chamber A for a period of time. When its diameter is smaller than the side length of the mesh hole 301-1... l At that time, the media ball can pass through the mesh hole 301-1 through the spiral stirring frame 301 and enter the fine grinding chamber B. The above description of the shape and size of the mesh hole 301-1 is an illustrative example. In actual application, the shape of the mesh hole 301-1 is not limited to a quadrilateral. The relationship between the size of the mesh hole 301-1 and the diameter of the media ball shall be set by the technician according to the specific grading requirements, so that the media ball can enter the fine grinding chamber B after it is worn down to a size smaller than the mesh hole 301-1.

[0043] The spiral stirring frame 301 divides the interior of the cylinder 601 into two regions: a coarse grinding chamber A and a fine grinding chamber B. The grinding media balls enter the coarse grinding chamber A through the grinding media ball inlet 503. Under the combined action of the spiral blades 202 and the inner blades 303, the grinding media balls grind the internal slurry particles. Initially, the diameter of the grinding media balls does not change significantly. After a period of operation, the grinding media balls continuously wear down, and their diameter becomes smaller than the side length of the mesh holes 301-1. l The media balls pass through the mesh holes 301-1 and the spiral stirring frame 301, and enter the fine grinding chamber B. At this time, the diameter of the media balls inside the coarse grinding chamber A is larger than the diameter of the media balls inside the fine grinding chamber B. The outer blades 302 of the spiral stirring frame 301 drive the media balls in the fine grinding chamber B to move and grind the internal mineral slurry particles, thereby realizing the self-classification grinding of the coarse grinding chamber A and the fine grinding chamber B inside the cylinder.

[0044] The drive system 100 is arranged on the top of the cylinder 601 and includes a motor 101, a thrust roller bearing 102, and a planetary gear mechanism 103. The planetary gear mechanism 103 includes a sun gear 103-1, a first planetary gear 103-2, a second planetary gear 103-3, a third planetary gear 103-4, an internal gear ring 103-5, and a planet carrier 103-6. The planet carrier 103-6 is fixed to the top of the cylinder 601 by welding. The motor 101 is located above the planet carrier 103-6, and the planetary gear mechanism 103 is installed below the planet carrier 103-6.

[0045] The sun gear 103-1 is mounted on the intermediate stirring shaft 201, and the outer circular end face of the internal gear ring 103-5 is welded with evenly distributed flanges 103-9. The flanges 103-9 (see Figure 3 ) and the annular groove 603 on the inner wall of the cylinder 601 (see Figure 8 The sun gear 103-1 meshes with the first planetary gear 103-2, the second planetary gear 103-3, and the third planetary gear 103-4, which are equidistant from each other. The first planetary gear 103-2, the second planetary gear 103-3, and the third planetary gear 103-4 mesh with the internal gear ring 103-5. The planet carrier 103-6 has threaded holes corresponding to the positions of the three planetary gears. The first planetary gear 103-2, the second planetary gear 103-3, and the third planetary gear 103-4 are fixedly connected to the planet carrier 103-6 by the first set of connecting bolts 103-7 to ensure that the positions of the planetary gears are fixed. The internal gear ring 103-5 has evenly distributed threaded holes. 5. The spiral mixing frame 301 is connected to the top of the second set of connecting bolts 103-8, thereby driving the spiral mixing frame 301 to rotate. The sun gear 103-1 is the driving gear, the internal gear ring 103-5 is the driven gear, and the first planetary gear 103-2, the second planetary gear 103-3, and the third planetary gear 103-4 are intermediate reversing gears. When the sun gear 103-1 rotates clockwise, the internal gear ring 103-5 rotates counterclockwise due to the meshing of the first planetary gear 103-2, the second planetary gear 103-3, and the third planetary gear 103-4 and the meshing of the internal gear ring 103-5. Similarly, when the sun gear 103-1 rotates counterclockwise, the internal gear ring 103-5 rotates clockwise.

[0046] Furthermore, a circular hole is provided at the center of the planetary carrier 103-6, and a thrust roller bearing 102 is installed in the circular hole. The outer ring of the thrust roller bearing 102 is interference-fitted with the circular hole, and the inner ring of the thrust roller bearing 102 is interference-fitted with the intermediate stirring shaft 201. The intermediate stirring shaft 201 passes through the thrust roller bearing 102 and is connected to the drive shaft of the motor 101 through a coupling. A keyway is provided on the intermediate stirring shaft 201 and is connected to the sun gear 103-1 through a key to ensure smooth transmission of the rotational motion of the motor 101.

[0047] When the motor 101 rotates, the intermediate stirring shaft 201 rotates through the coupling. The intermediate stirring shaft 201 simultaneously transmits its rotation to the sun gear 103-1, thereby driving the planetary gear mechanism 103 to move. The rotation of the internal gear ring 103-5 drives the spiral stirring frame 301 to rotate. The rotation directions of the intermediate stirring shaft 201 and the internal gear ring 103-5 are opposite. The intermediate stirring shaft 201 is welded with involute spiral blades 202. The spiral stirring frame 301 is welded with spiral outer blades 302 on the outside and spiral inner blades 303 on the inside. Therefore, when the motor 101 drives the intermediate stirring shaft 201 to rotate, the spiral blades 202 on the intermediate stirring shaft 201 and the inner blades 303 of the spiral stirring frame 301 work together to drive the media balls to move and grind the slurry particles in the coarse grinding chamber A. The outer blades 302 of the spiral stirring frame 301 drive the media balls to move and grind the slurry particles in the fine grinding chamber B.

[0048] like Figure 1 and Figure 5-8 As shown, the cylinder bottom anti-deviation system 400 includes a cylinder bottom tray 401, a self-aligning bearing 402, a connecting rod bracket 403, a third set of connecting bolts 404, a bearing retaining ring 405, a gasket 406, and an annular guard plate 407. The outer diameter of the cylinder bottom tray 401 is the same as the inner diameter of the cylinder body 601. The cylinder bottom tray 401 is fixedly connected to the bottom of the cylinder body 601 by welding. The cylinder bottom tray 401 has a vertical edge, and an annular guard plate 407 is provided on the cylinder bottom tray 401. The outer diameter of the annular guard plate 407 is smaller than the inner diameter of the vertical edge of the cylinder bottom tray 401, forming an annular gap 409 between them. The cross-section of the annular guard plate 407 is an inverted "L" shape. The shaped protective plate 407 is fixed to the middle of the bottom tray 401 via a vertical section, and a circular hole is formed inside the vertical section. A self-aligning bearing 402 is installed inside the circular hole, with its outer ring interference-fitted to the hole wall. The lower end of the intermediate stirring shaft 201 is interference-fitted into the inner ring of the self-aligning bearing 402 to prevent significant shaking during rotation. A shoulder is provided on the intermediate stirring shaft 201 above the self-aligning bearing 402, with a certain distance between the upper end face of the self-aligning bearing 402 and the shoulder of the intermediate stirring shaft 201 for the assembly of the bearing retainer ring 405 and the gasket 406. Figure 5-6 As shown, the bearing retaining ring 405 is an "L"-shaped retaining ring, which is set on the upper end face of the self-aligning bearing 402. The outer side of the bearing retaining ring 405 is interference-fitted with the circular hole wall of the annular guard plate 407. The inner hole of the bearing retaining ring 405 is clearance-fitted with the intermediate stirring shaft 201. The gasket 406 is installed above the bearing retaining ring 405. The gasket 406 is clearance-fitted with the intermediate stirring shaft 201. The inner diameter of the gasket 406 is smaller than the inner diameter of the bearing retaining ring 405, and the outer diameter of the gasket 406 is larger than the outer diameter of the vertical section of the bearing retaining ring 405. The bearing retaining ring 405 and the gasket 406 effectively shield and seal the installation part of the self-aligning bearing 402 to ensure that the slurry does not flow into the working environment of the bearing.

[0049] like Figure 1 and 5 As shown, a connecting rod bracket 403 is installed between the bottom tray 401 and the annular guard plate 407 with an inverted "L" shaped cross-section. The connecting rod bracket 403 is composed of a ring and connecting rods connected by welding. The ring is fitted outside the vertical section of the annular guard plate 407 with a clearance fit. Multiple connecting rods (four in the figure) are evenly distributed radially on the outer ring of the ring. The ends of the connecting rods and the bottom of the spiral stirring frame 301 are respectively provided with corresponding circular through holes and threaded holes. The two are connected by a third set of connecting bolts 404 to prevent the spiral stirring frame 301 from shaking and being unbalanced during rotation with the intermediate stirring shaft 201. During installation, the annular guard plate 407 is first placed between the connecting rod bracket 403 and the spiral stirring frame 301. After the connecting bracket 403 and the spiral stirring frame 301 are connected by the third set of connecting bolts 404, the annular guard plate 407 is then welded to the bottom tray 401.

[0050] like Figure 1 and 7 As shown, the annular bottom edge 301-2 of the spiral agitator 301 covers the annular gap 409 between the annular guard plate 407 and the bottom tray 401. The inner ring of the annular bottom edge 301-2 contacts the annular guard plate 407, and the outer ring contacts the vertical edge of the bottom tray 401. They are connected on the contact surfaces by mutually cooperating bosses 408. Specifically, at the position where the top of the bottom tray 401 contacts the bottom of the spiral agitator 301, with the axis of the third set of connecting bolts 404 as the reference, trapezoidal bosses 408 are symmetrically arranged on the near-axial edges of the bottom tray 401 and the annular guard plate 407, and on the far-axial edge of the annular bottom edge 301-2 of the spiral agitator 301. The two bosses 408 can completely fit together to ensure that the slurry does not flow into the internal space of the bottom tray 401.

[0051] The working process of this invention is as follows: First, the cylinder 601 is installed at the work site. Grinding media balls are filled into the coarse grinding chamber A inside the cylinder 601 through the grinding media ball inlet 503. Then, slurry is introduced through the feed inlet 501. The motor 101 is started, and under the action of the planetary gear mechanism 103, the intermediate stirring shaft 201 and the spiral stirring frame 301 rotate synchronously in opposite directions. Under the combined action of the spiral blades 202 and the inner blades 303 of the spiral stirring frame 301, the slurry particles inside the coarse grinding chamber A are ground. Initially, the diameter of the grinding media balls does not change significantly. After working for a period of time, the grinding media balls continuously wear down, and their diameter becomes smaller than the side length of the mesh hole 301-1. l The grinding media balls enter the fine grinding chamber B through the mesh holes 301-1 of the spiral stirring frame 301. At this time, the diameter of the grinding media balls inside the coarse grinding chamber A is larger than that inside the fine grinding chamber B. The outer blades 302 of the spiral stirring frame 301 drive the grinding media balls in the fine grinding chamber B to grind the internal slurry particles, realizing the self-classification grinding of the coarse grinding chamber A and the fine grinding chamber B inside the cylinder. After working for a period of time, grinding media balls are continuously added from the grinding media ball inlet 503 to replenish the grinding media balls lost in the coarse grinding chamber A. After the particles in the slurry have been ground for a period of time, the fine particles rise from the inside of the cylinder under the action of buoyancy and overflow from the discharge outlet 502.

[0052] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A vertical spiral stirring mill device, comprising a cylindrical body, wherein a vertical intermediate stirring shaft is disposed in the middle of the cylindrical body, and spiral blades are wound around the intermediate stirring shaft to form a spiral stirrer, characterized in that, The outer diameter of the spiral blades gradually increases from top to bottom, forming a tapered, involute structure. A spiral stirring frame is provided between the spiral blades and the cylinder. The spiral stirring frame has a tapered structure, smaller at the top and larger at the bottom. The sidewalls of the spiral stirring frame have a mesh structure, and spiral inner and outer blades are respectively provided on the inner and outer sides. The spiral stirring frame divides the interior of the cylinder into two grinding chambers: a coarse grinding chamber and a fine grinding chamber. The grinding chamber located inside the spiral stirring frame is the coarse grinding chamber, and the grinding chamber located outside the spiral stirring frame is the fine grinding chamber. The diameter of the grinding media in the coarse grinding chamber is larger than that in the fine grinding chamber. The mesh structure on the sidewall forms multiple mesh holes. By setting the size of these mesh holes, the grinding media in the two grinding chambers are sieved. After the grinding media wears down to a certain extent, it enters the coarse grinding chamber inside the spiderweb-shaped biomimetic spiral stirring frame and then the fine grinding chamber outside. Larger diameter grinding media work in the coarse grinding chamber, while smaller diameter grinding media work in the fine grinding chamber, achieving self-grading grinding within the cylinder. The spiral stirring frame rotates in the opposite direction to the spiral stirrer. The inner and outer blades on the spiral stirring frame have the same helical direction, but the opposite helical direction to the spiral blades of the spiral stirrer. The pitch of the spiral blades... h 1 is slightly larger than the pitch of the inner or outer blades on the spiral mixer. h 2; The tilt angle of the spiral stirring frame is the same as the tilt angle of the spiral blades, and the distance s between the edge of the inner blade on the inner wall of the spiral stirring frame and the edge of the spiral blade of the spiral stirrer satisfies d < s <2 d , d The diameter of the grinding media.

2. The vertical spiral stirring mill device according to claim 1, characterized in that, A drive system is provided above the cylinder. The drive system includes a motor, a planetary gear mechanism, and a planetary carrier. The planetary carrier is fixed at the top of the cylinder. The motor is located above the planetary carrier. A circular hole is provided in the center of the planetary carrier and a thrust roller bearing is installed thereon. The intermediate stirring shaft passes through the thrust roller bearing and is connected to the motor through a coupling. The planetary gear mechanism is installed below the planetary carrier. The intermediate stirring shaft transmits power to the planetary gear mechanism, which drives the spiral stirring frame to rotate.

3. The vertical spiral stirring mill device according to claim 2, characterized in that, The planetary gear mechanism includes a sun gear, planetary gears, and an internal gear ring. Multiple planetary gears are disposed between the sun gear and the internal gear ring, meshing with the sun gear and the internal gear ring respectively. The sun gear is mounted on an intermediate stirring shaft, the planetary gears are mounted on a planet carrier, and the internal gear ring is mounted in an annular groove on the inner wall of the cylinder. The intermediate stirring shaft drives the sun gear to rotate through a keyway. The rotation of the sun gear is transmitted to the internal gear ring through the planetary gears. The internal gear ring is connected to the spiral stirring frame, thereby driving the spiral stirring frame to rotate.

4. The vertical spiral stirring mill device according to claim 1, characterized in that, The bottom of the cylinder is equipped with a bottom anti-deviation system, which includes a bottom tray, an annular guard plate, and a self-aligning bearing. The bottom tray is fixed to the bottom of the cylinder, and the bottom tray has a vertical edge. An annular guard plate is fixed on the bottom tray. The outer diameter of the annular guard plate is smaller than the inner diameter of the vertical edge of the bottom tray, forming an annular gap between them. The cross-section of the annular guard plate is inverted "L" shape. The annular guard plate is fixed to the middle of the bottom tray through a vertical section, and a circular hole is formed inside the vertical section. A self-aligning bearing is installed in the circular hole. The outer ring of the self-aligning bearing is interference-fitted with the hole wall of the circular hole. The lower end of the intermediate stirring shaft is installed in the inner ring of the self-aligning bearing and is interference-fitted with the inner ring of the self-aligning bearing.

5. A vertical spiral stirring mill apparatus according to claim 4, characterized in that, A shoulder is provided on the stirring shaft located above the self-aligning bearing. A bearing retainer and a washer are installed between the upper end face of the self-aligning bearing and the shoulder of the intermediate stirring shaft. The bearing retainer is an "L"-shaped retainer. The outer side of the bearing retainer is interference-fitted with the circular hole wall of the protective plate. The inner hole of the bearing retainer is clearance-fitted with the intermediate stirring shaft. The washer is installed above the bearing retainer. The washer is clearance-fitted with the intermediate stirring shaft. The inner diameter of the washer is smaller than the inner diameter of the bearing retainer, and the outer diameter of the washer is larger than the outer diameter of the vertical section of the bearing retainer.

6. A vertical spiral stirring mill apparatus according to claim 4, characterized in that, A connecting rod support is provided between the annular guard plate and the bottom tray of the cylinder. The connecting rod support consists of a ring and connecting rods. The ring is sleeved outside the vertical section of the annular guard plate and the two are in clearance fit. Multiple connecting rods are fixed radially on the ring. The ends of the connecting rods are fixedly connected to the annular bottom edge of the spiral stirring frame by bolts.

7. A vertical spiral stirring mill apparatus according to claim 4, characterized in that, The annular bottom edge of the spiral stirring rack covers the annular gap between the annular guard plate and the bottom tray. The annular bottom edge of the spiral stirring rack contacts the vertical edges of the annular guard plate and the bottom tray on the inner and outer sides, respectively, and forms mutually cooperating boss structures on the contact surfaces. The cross-section of the boss structure is trapezoidal.

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