Vertical spiral stirring mill device

Abstract

According to the vertical spiral stirring mill device, blades of a spiral stirrer are designed to be of a conical involute structure, and the pushing capacity of the stirrer to medium balls at the bottom of a barrel is improved; a bionic spiral stirring frame with inner and outer blades is designed on the outer side of the spiral stirrer in the barrel, medium balls are driven to grind ore pulp particles while self-grading of the medium balls is achieved, and the collision frequency of the medium balls is improved through cooperation with the spiral stirrer; and meanwhile, a cylinder bottom anti-deflection system is designed to solve the deflection problem of the stirrer in the cylinder, so that the grinding efficiency and the service life of the vertical spiral stirring mill device are integrally improved and prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of grinding equipment, and in particular to a vertical spiral stirring mill device. Background Art

[0002] Vertical spiral stirred mill is a highly efficient ultrafine grinding equipment, usually composed of a cylinder, a spiral stirrer, a drive motor, etc. The spiral stirrer stirs the grinding medium balls and the slurry mixture in the cylinder under the drive of the motor, and the slurry particles are refined through the continuous collision, extrusion and friction of the grinding medium balls. Compared with the traditional horizontal ball mill, the vertical spiral stirred mill has the advantages of high efficiency and energy saving, low noise, small footprint, short installation period, long service life and high reliability.

[0003] The existing vertical spiral stirred mill is a single-cylinder grinding chamber with a single grinding fineness and no grading ability. In addition, the medium balls near the inner wall and bottom of the cylinder in the grinding chamber are not directly driven by the agitator blades, which makes the grinding efficiency of the slurry low. On the other hand, the upper end of the spiral agitator shaft of the current vertical spiral stirred mill is connected to the drive system through a bearing, and the lower end is a free end. During operation, the grinding medium balls are unevenly distributed inside the cylinder, causing the free end to swing. When the swing is serious, it will directly damage the bearing structure and cause equipment failure. Therefore, it is necessary to explore new vertical spiral stirred mill devices to solve the problems of the existing vertical spiral stirred mill, such as the grinding chamber has no grading ability, the work efficiency needs to be further improved, and the spiral agitator swing. Summary of the invention

[0004] In view of the defects of the prior art, the present invention provides a vertical spiral stirred mill device, which, through the design of conical involute spiral blades, bionic spiral stirring frame and anti-deviation system of the bottom of the barrel, can effectively improve the grinding efficiency while grading the grinding chamber and solve the problem of the deviation of the agitator in the barrel.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is: A vertical spiral stirring mill device comprises a cylinder, a vertical middle stirring shaft is arranged in the middle of the cylinder, a spiral blade is coiled on the middle stirring shaft to form a spiral stirrer, the outer diameter of the spiral blade gradually increases from top to bottom to form a conical involute structure, a spiral stirring frame is arranged between the spiral blade and the cylinder, the spiral stirring frame is a conical cylinder structure with a small top and a large bottom, the side wall of the spiral stirring frame is a grid structure, and the inner and outer side walls are respectively provided with spiral inner blades and outer blades, the spiral stirring frame divides the interior of the cylinder into two grinding chambers, and the spiral stirring frame rotates in the opposite direction to the spiral stirrer.

[0006] 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 the diameter of the grinding medium in the fine grinding chamber. The grid structure of the side wall of the spiral stirring frame forms a plurality of grid holes, and the grinding media in the two grinding chambers are screened by setting the size of the grid holes.

[0007] Furthermore, the spiral directions of the inner blades and the outer blades on the spiral stirring frame are the same and opposite to the spiral direction of the spiral blades of the spiral stirrer, and the pitch h1 of the spiral blades is slightly larger than the pitch h2 of the inner blades or the outer blades on the spiral stirring frame.

[0008] Furthermore, the inclination angle of the spiral stirring frame is the same as the inclination angle of the spiral blade, 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.

[0009] Furthermore, a driving system is provided above the cylinder, and the driving 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 power is transmitted to the planetary gear mechanism through the intermediate stirring shaft, and the spiral stirring frame is driven to rotate by the planetary gear mechanism.

[0010] Furthermore, the planetary gear mechanism includes a sun gear, planetary gears and an inner ring gear, and multiple planetary gears are arranged between the sun gear and the inner ring gear, and are respectively meshed with the sun gear and the inner ring gear. The sun gear is installed on an intermediate stirring shaft, the planetary gears are installed on a planetary carrier, and the inner ring gear is installed in an annular groove on the inner wall of the cylinder body. The intermediate stirring shaft drives the sun gear to rotate through a keyway, and the rotation of the sun gear is transmitted to the inner ring gear through the planetary gears. The inner ring gear is connected to the spiral stirring frame to drive the spiral stirring frame to rotate.

[0011] Furthermore, a bottom anti-deviation system is provided at the bottom of the cylinder body, and the bottom anti-deviation system includes a bottom tray, an annular guard plate and a self-aligning bearing. The bottom tray is fixed to the bottom of the cylinder body, and a vertical edge is provided on the edge of the bottom tray. 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, and an annular gap is formed between the two. The cross-section of the annular guard plate is an inverted "L" shape. The annular guard plate is fixed in 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, and the outer ring of the self-aligning bearing is interference fit 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 fit with the inner ring of the self-aligning bearing.

[0012] Furthermore, a shoulder is provided on the stirring shaft located above the self-aligning bearing, and a bearing retaining ring and a gasket are installed between the upper end surface of the self-aligning bearing and the shoulder of the intermediate stirring shaft. The bearing retaining ring is an "L"-shaped retaining ring, and the outer side surface of the bearing retaining ring is interference fit with the circular hole wall of the guard plate, and the inner hole of the bearing retaining ring is clearance fit with the intermediate stirring shaft. The gasket is installed above the bearing retaining ring, and the gasket is clearance fit with the intermediate stirring shaft. The inner diameter of the gasket is smaller than the inner diameter of the bearing retaining ring, and the outer diameter of the gasket is larger than the outer diameter of the vertical section of the bearing retaining ring.

[0013] Furthermore, a connecting rod bracket is arranged between the annular guard plate and the drum bottom tray, and the connecting rod bracket consists of a circular ring and a connecting rod. The circular ring is sleeved on the outside of the vertical section of the annular guard plate and the two are clearance-fitted. Multiple connecting rods are radially fixed on the circular ring, and the end of the connecting rod is fixedly connected to the annular bottom edge of the spiral stirring frame by bolts.

[0014] Furthermore, the annular bottom edge of the spiral stirring frame covers the annular gap between the annular guard plate and the drum bottom tray, and the annular bottom edge of the spiral stirring frame contacts the vertical edges of the annular guard plate and the drum bottom tray on the inside and outside respectively, and forms mutually matching boss structures on the contact surfaces respectively, and the cross-section of the boss structure is a trapezoid.

[0015] Beneficial effects: 1. The present invention designs the spiral blade of the spiral agitator to be a conical involute structure, and the outer diameter of the spiral blade gradually increases from top to bottom, thereby improving the agitator's ability to lift the medium ball at the bottom of the cylinder, thereby improving the grinding efficiency.

[0016] 2. The present invention arranges a spiral stirring frame outside the spiral stirrer to divide the interior of the cylinder into two chambers, a coarse grinding chamber and a fine grinding chamber. A number of holes are opened on the spiral stirring frame. When the medium balls are worn to a certain extent, they will enter the fine grinding chamber outside from the coarse grinding chamber inside the bionic spiral stirring frame. The large-diameter medium balls work in the coarse grinding chamber and the small-diameter medium balls work in the fine grinding chamber, thereby realizing self-grading grinding in the cylinder.

[0017] 3. The structure of the spiral stirring frame of the present invention is inspired by the shape characteristics of a spider web, and has a stable structure. The inner and outer blades are respectively designed inside and outside the spiral stirring frame, which can drive the spiral motion of the inner and outer medium balls at the same time, and 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 medium balls in the cylinder and improve the grinding efficiency.

[0018] 4. The present invention designs a cylinder anti-deviation system based on the double grinding chamber. Through structures such as self-aligning bearings, cylinder bottom trays, annular guard plates and connecting rod brackets, the axis alignment of the spiral agitator and the bionic spiral stirring frame is ensured, and the agitator deflection problem in the cylinder is completely solved. At the same time, the cylinder bottom sealing effect is ensured through structures such as bearing retaining rings, annular guard plates and contact surface boss designs, effectively preventing the slurry from entering the cylinder bottom anti-deviation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic internal cross-sectional view of a vertical spiral stirring mill device of the present invention; Figure 2 A schematic diagram of a grinding system of a vertical spiral stirring mill device of the present invention; Figure 3 A top view of a planetary gear mechanism of a vertical spiral stirring mill device of the present invention; Figure 4 For the present invention Figure 3 BB cross-sectional view; Figure 5 A schematic diagram of a cylinder bottom anti-deviation system of a vertical spiral stirring mill device of the present invention; Figure 6 It is a partial cross-sectional view of the barrel bottom anti-deviation system of the present invention; Figure 7 Another partial cross-sectional view of the barrel bottom anti-deviation system of the present invention; Figure 8 The figure is an axial side view of a vertical spiral stirring mill device of the present invention.

[0020] Reference numerals: 100 driving 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 inner ring gear, 103-6 planet carrier, 103-7 first set of connecting bolts, 103-8 second set of connecting bolts, 103-9 flange; 200 coarse grinding system: 201 intermediate stirring shaft, 202 spiral blade; 300 fine grinding system, 301 spiral stirring frame, 301-1 grid hole, 301-2 annular bottom edge, 302 outer blade, 303 inner blade; 400 drum bottom anti-deviation system: 401 drum bottom tray, 402 self-aligning bearing, 403 connecting rod bracket, 404 third set of connecting bolts, 405 bearing retaining ring, 406 gasket, 407 annular guard plate, 408 boss, 409 annular gap; 500 circulation system: 501 inlet, 502 outlet, 503 grinding medium ball injection port, 504 grinding door; 600 support system: 601 cylinder, 602 wear-resistant lining, 603 annular groove; A coarse grinding chamber, B fine grinding chamber. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] like Figures 1 to 8 As shown, a vertical spiral stirring mill device of the present invention includes a driving system 100, a coarse grinding system 200, a fine grinding system 300, a cylinder bottom anti-deviation system 400, a circulation system 500 and a support system 600; the structure and function of each system are described in detail below.

[0023] like Figure 1 or Figure 8 As shown, the support system 600 includes a cylinder 601 and a wear-resistant lining 602; the circulation system 500 includes an inlet 501, an outlet 502, a grinding medium ball-casting port 503, and a grinding door 504; the inner wall of the cylinder 601 is fixedly connected with the wear-resistant lining 602 by welding, and a grinding door 504 is opened on one side of the cylinder wall of the cylinder 601, and the grinding door 504 is connected to the cylinder 601 by hinged connection; the inlet 501, the outlet 502, and the grinding medium ball-casting port 503 of the circulation system 500 are all formed by slotting with a certain diameter on the cylinder wall of the cylinder 601, wherein the inlet 501 and the outlet 502 are circular holes opened from the bottom and the top of the cylinder 601 respectively, so as to realize the entry and exit of slurry; the grinding medium ball-casting port 503 is a circular hole opened from the top of the cylinder 601 at a certain inclination angle and connected to the inclined feeding pipe, so as to realize the filling of grinding medium balls.

[0024] 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, an outer blade 302, an inner blade 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, and the grinding system is arranged in a cylinder 601. Specifically, an upright intermediate stirring shaft 201 is arranged in the middle of the cylinder 601, and a spiral blade 202 is coiled on the intermediate stirring shaft 201. The intermediate stirring shaft 201 and the spiral blade 202 together constitute a spiral stirrer, wherein the outer diameter of the spiral blade 202 gradually increases from top to bottom and presents a conical involute structure to improve the lifting capacity of the medium ball at the bottom of the cylinder 601; between the spiral blade 202 and A spiral stirring frame 301 is provided between the cylinder 601. The spiral stirring frame 301 is a conical structure with a small upper part and a large lower part, which divides the interior of the cylinder 601 into two grinding chambers; wherein, the coarse grinding chamber A is located inside the spiral stirring frame 301, and the fine grinding chamber B is located outside the spiral stirring frame 301. The side wall of the spiral stirring frame 301 is a grid structure with a plurality of grid holes 301-1 distributed thereon. The grinding medium balls in the two grinding chambers are screened by setting the size of the grid holes 301-1; spiral inner blades 303 and outer blades 302 are respectively provided on the inner and outer walls of the spiral stirring frame 301. The spiral stirring frame 301 rotates in opposite directions to the spiral stirrer. The combined action of the two can increase the number of collisions of the medium balls in the cylinder 601 and improve the grinding efficiency.

[0025] The spiral blades 202 of the conical involute structure gradually extend outward from top to bottom to a certain inclination angle α, and appear conical when viewed from the side. The spiral stirring frame 301 is welded with a spiral outer blade 302 on the outside and a spiral inner blade 303 on the inside. The spiral stirring frame 301 is also conical when viewed from the side, and the inclination angle β of the spiral stirring frame 301 is completely consistent with the inclination angle α of the spiral blades 202 to ensure that the two will not interfere with each other or collide during the rotation process.

[0026] The spiral directions of the inner blades 303 and outer blades 302 on the spiral stirring frame 301 are the same and opposite to the spiral direction of the spiral blades 202 of the spiral stirrer. A plurality of groups of corresponding inner blades 303 and outer blades 302 are arranged on the inner and outer walls of the spiral stirring frame 301, and the projection positions of each group of corresponding inner blades 303 and outer blades 302 on the side wall of the spiral stirring frame 301 coincide. The distance between the edge of the maximum diameter blade at the bottom of the spiral blade 202 and the edge of the maximum diameter blade at the bottom of the inner blade 303 inside the spiral agitator 301 is s, and the diameter of the medium ball filled in the vertical spiral stirring mill system is d, then the distance s is required to satisfy d<s<2d to avoid the medium ball being stuck between the blades of the spiral agitator 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 is a grid-like structure, which can be welded from a number of steel bars during manufacture. In the illustrated embodiment, the spiral stirring frame 301 has a number of quadrilateral grid holes 301-1 distributed circumferentially from top to bottom (the grid holes have different sizes in the figure due to modeling, but in fact the sizes of the grid holes are consistent). If the side length of each grid hole 301-1 is l , usually requires the side length l 3 / 5 of the diameter of the medium ball, so as to ensure that the diameter of the grinding medium ball will continue to decrease due to wear after working in the rough grinding chamber A for a period of time. When its diameter is smaller than the side length of the grid hole 301-1, l When the medium ball passes through the mesh hole 301-1 and the spiral stirring frame 301, it can enter the fine grinding chamber B; the above descriptions on the shape and size of the mesh hole 301-1 are all exemplary descriptions. 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 medium ball is set by the technician according to the specific classification requirements, so that the medium ball can enter the fine grinding chamber B after being worn to a size smaller than the mesh hole 301-1.

[0027] The spiral stirring frame 301 divides the interior of the cylinder 601 into two areas: a coarse grinding chamber A and a fine grinding chamber B; the medium ball enters the coarse grinding chamber A from the grinding medium ball inlet 503, and the medium ball grinds the internal slurry particles under the joint action of the spiral blade 202 and the inner blade 303. In the initial stage, the diameter of the grinding medium ball does not change significantly; after working for a period of time, the grinding medium ball is constantly worn, and the diameter is smaller than the side length of the grid hole 301-1 l The medium balls pass through the mesh holes 301-1 through the spiral stirring frame 301 and enter the fine grinding chamber B. At this time, the diameter of the medium balls inside the coarse grinding chamber A is larger than the diameter of the medium balls inside the fine grinding chamber B. The outer blades 302 of the spiral stirring frame 301 drive the medium balls in the fine grinding chamber B to move and grind the internal slurry particles, thereby realizing self-grading grinding in the coarse grinding chamber A and the fine grinding chamber B inside the cylinder.

[0028] The drive system 100 is arranged at 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 inner ring gear 103-5, and a planetary carrier 103-6, wherein the planetary carrier 103-6 is fixed to the top of the cylinder 601 by welding, the motor 101 is located above the planetary carrier 103-6, and the planetary gear mechanism 103 is installed below the planetary carrier 103-6.

[0029] The sun gear 103-1 is mounted on the intermediate stirring shaft 201. The outer circumferential end surface of the inner gear ring 103-5 is welded with flanges 103-9 evenly distributed. Figure 3 ) and the annular groove 603 on the inner wall of the cylinder 601 (see Figure 8 ) cooperates to axially limit the inner gear ring 103-5; the sun gear 103-1 is meshed with the first planetary gear 103-2, the second planetary gear 103-3, and the third planetary gear 103-4 which are evenly distributed; the first planetary gear 103-2, the second planetary gear 103-3, and the third planetary gear 103-4 are meshed with the inner gear ring 103-5; the planet carrier 103-6 is provided with threaded holes corresponding to the positions of the three planetary gears, and 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 inner gear ring 103-5 is evenly provided with threaded holes, and the inner gear ring 103- The second set of connecting bolts 103-8 are connected to the top of the spiral stirring frame 301, so as to drive the spiral stirring frame 301 to rotate. The sun gear 103-1 is a driving wheel, the inner gear ring 103-5 is a driven wheel, and the first planetary gear 103-2, the second planetary gear 103-3, and the third planetary gear 103-4 are intermediate direction-changing gears. When the sun gear 103-1 rotates clockwise, the inner gear ring 103-5 rotates counterclockwise through the meshing direction change of the first planetary gear 103-2, the second planetary gear 103-3, and the third planetary gear 103-4 and the meshing direction of the inner gear ring 103-5, so as to achieve the effect of reversing rotation. Similarly, when the sun gear 103-1 rotates counterclockwise, the inner gear ring 103-5 rotates clockwise.

[0030] Furthermore, a circular hole is opened at the center position 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 fit with the circular hole, and the inner ring of the thrust roller bearing 102 is interference fit with the intermediate stirring shaft 201; the intermediate stirring shaft 201 passes through the thrust roller bearing 102 and is connected to the transmission shaft of the motor 101 through a coupling. A key slot is opened 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.

[0031] When the motor 101 rotates, the intermediate stirring shaft 201 rotates through the coupling, and the intermediate stirring shaft 201 simultaneously transmits the rotation to the sun gear 103-1, thereby driving the planetary gear mechanism 103 to move, and driving the spiral stirring frame 301 to rotate through the rotation of the inner gear ring 103-5, the intermediate stirring shaft 201 and the inner gear ring 103-5 have opposite rotation directions, and the intermediate stirring shaft 201 is welded with an involute spiral blade 202, and the spiral stirring frame 301 is welded with a spiral outer blade 302 on the outside and a spiral inner blade 303 on the inside; therefore, when the motor 101 drives the intermediate stirring shaft 201 to rotate, the spiral blade 202 on the intermediate stirring shaft 201 and the inner blade 303 of the spiral stirring frame 301 work together to drive the medium ball to move in the coarse grinding chamber A to grind the ore pulp particles, and the outer blade 302 of the spiral stirring frame 301 drives the medium ball to move in the fine grinding chamber B to grind the ore pulp particles.

[0032] 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 group of connecting bolts 404, a bearing retaining ring 405, a gasket 406, and an annular guard plate 407; wherein, 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 edge of the cylinder bottom tray 401 is provided with a vertical edge, and the cylinder bottom tray 401 is provided with an annular guard plate 407, 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, and an annular gap 409 is formed between the two, and the cross-section of the annular guard plate 407 is an inverted "L" shape. The shaped guard plate 407 is fixed in the middle of the drum bottom tray 401 through a vertical section, and a circular hole is formed inside the vertical section. A self-aligning bearing 402 is installed in the circular hole. The outer ring of the self-aligning bearing 402 is interference fit with the hole wall of the circular hole. The lower end of the intermediate stirring shaft 201 is interference fit installed in the inner ring of the self-aligning bearing 402 to prevent the intermediate stirring shaft 201 from shaking significantly during rotation. A shoulder is provided on the intermediate stirring shaft 201 located above the self-aligning bearing 402. A certain distance is left between the upper end surface of the self-aligning bearing 402 and the shoulder of the intermediate stirring shaft 201 for assembling the bearing retaining ring 405 and the gasket 406, such as Figure 5-6 As shown, the bearing retaining ring 405 is an "L"-shaped retaining ring, which is arranged on the upper end surface of the self-aligning bearing 402, and the outer side surface of the bearing retaining ring 405 is interference fit with the circular hole wall of the annular guard plate 407, the inner hole of the bearing retaining ring 405 is clearance fit with the intermediate stirring shaft 201, and the gasket 406 is installed above the bearing retaining ring 405, and the gasket 406 is clearance fit 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 installation part of the self-aligning bearing 402 is effectively shielded and sealed by the bearing retaining ring 405 and the gasket 406 to ensure that the slurry does not flow into the working environment of the bearing.

[0033] like Figure 1 and 5 As shown, a connecting rod bracket 403 is installed between the drum 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 circular ring and a connecting rod connected by welding. The circular ring is sleeved on the outside of the vertical section of the annular guard plate 407 and the two are clearance-matched. A plurality of connecting rods (four in the figure) are evenly distributed radially on the outer ring of the circular 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, and the two are connected by a third set of connecting bolts 404 to prevent the spiral stirring frame 301 from shaking and unbalanced loading during the rotation of 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 welded to the drum bottom tray 401.

[0034] like Figure 1 and 7 As shown, the annular bottom edge 301-2 of the spiral stirring frame 301 covers the annular gap 409 between the annular guard plate 407 and the drum bottom tray 401, the inner circle of the annular bottom edge 301-2 contacts the annular guard plate 407, and the outer circle contacts the vertical edge of the drum bottom tray 401, and they are respectively connected on the contact surface with mutually matching boss 408 structures; specifically, at the position where the top of the drum bottom tray 401 contacts the bottom of the spiral stirring frame 301, with the axis of the third group of connecting bolts 404 as the reference, the boss 408 with a trapezoidal cross-section is symmetrically arranged at the near-axis edge of the drum bottom tray 401 and the annular guard plate 407, and the far-axis edge of the annular bottom edge 301-2 of the spiral stirrer 301, and the two parts of the boss 408 can be completely matched and contacted to ensure that the slurry does not flow into the internal space of the drum bottom tray 401.

[0035] The working process of the present invention is as follows: firstly, the cylinder 601 is installed at the work site, and the medium balls are filled into the rough grinding chamber A inside the cylinder 601 from the grinding medium ball injection port 503, and then the slurry is introduced from the feed port 501, and the motor 101 is started. Under the action of the planetary gear mechanism 103, the intermediate stirring shaft 201 and the spiral stirring frame 301 are driven to rotate synchronously, and the two rotate in opposite directions. Under the joint action of the spiral blade 202 and the inner blade 303 of the spiral stirring frame 301, the slurry particles inside the rough grinding chamber A are ground. In the initial stage, the diameter of the grinding medium ball does not change significantly. After working for a period of time, the grinding medium ball is constantly worn, and the diameter is smaller than the side length of the grid hole 301-1. l The medium balls enter the fine grinding chamber B through the grid holes 301-1 of the spiral stirring frame 301. At this time, the diameter of the medium balls inside the coarse grinding chamber A is larger than the diameter of the medium balls inside the fine grinding chamber B. The outer blades 302 of the spiral stirring frame 301 drive the medium balls in the fine grinding chamber B to move and grind the internal slurry particles, thereby realizing the self-grading grinding of the coarse grinding chamber A and the fine grinding chamber B inside the cylinder. After working for a period of time, medium balls continue to be added from the grinding medium ball feeding port 503 to supplement the loss of medium balls in the coarse grinding chamber A. After the particles in the slurry are 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 port 502.

[0036] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A vertical spiral stirring mill device, comprising a cylinder, wherein a vertical intermediate stirring shaft is provided in the middle of the cylinder, and a spiral blade is wound around the intermediate stirring shaft to form a spiral stirrer, characterized in that: The outer diameter of the spiral blade gradually increases from top to bottom to form a conical involute structure. A spiral stirring frame is provided between the spiral blade and the barrel. The spiral stirring frame is a conical structure that is small at the top and large at the bottom. The side wall of the spiral stirring frame is a grid structure, and spiral inner blades and outer blades are respectively provided on the inner and outer walls. The spiral stirring frame divides the interior of the barrel into two grinding chambers, and the spiral stirring frame rotates in the opposite direction to the spiral stirrer.

2. A vertical spiral stirring mill device according to claim 1, characterized in that: 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 greater than the diameter of the grinding medium in the fine grinding chamber. The grid structure of the side wall of the spiral stirring frame forms a plurality of grid holes, and the grinding media in the two grinding chambers are screened by setting the size of the grid holes.

3. A vertical spiral stirring mill device according to claim 1, characterized in that: The inner blade and the outer blade on the spiral stirring frame have the same spiral direction and are opposite to the spiral direction of the spiral blade of the spiral stirrer. h 1 Slightly larger than the pitch of the inner or outer blades on the spiral stirring frame h 2.

4. A vertical spiral stirring mill device according to claim 1, characterized in that: The inclination angle of the spiral stirring frame is the same as the inclination angle of the spiral blade, 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 is the diameter of the grinding medium.

5. A vertical spiral stirring mill device according to claim 1, characterized in that: A driving system is provided above the cylinder, and the driving system includes a motor, a planetary gear mechanism and a planetary frame. The planetary frame is fixed at the top of the cylinder, and the motor is located above the planetary frame. A circular hole is provided in the center of the planetary frame and a thrust roller bearing is installed. 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 frame, and power is transmitted to the planetary gear mechanism through the intermediate stirring shaft, and the spiral stirring frame is driven to rotate by the planetary gear mechanism.

6. A vertical spiral stirring mill device according to claim 5, characterized in that: The planetary gear mechanism includes a sun gear, planetary gears and an inner ring gear. A plurality of planetary gears are arranged between the sun gear and the inner ring gear, and are respectively meshed with the sun gear and the inner ring gear. The sun gear is mounted on an intermediate stirring shaft, the planetary gears are mounted on a planetary carrier, and the inner ring gear 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, and the rotation of the sun gear is transmitted to the inner ring gear through the planetary gears. The inner ring gear is connected to the spiral stirring frame to drive the spiral stirring frame to rotate.

7. A vertical spiral stirring mill device according to claim 1, characterized in that: A cylinder bottom anti-deviation system is provided at the bottom of the cylinder body, and the cylinder bottom anti-deviation system 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 body, and a vertical edge is provided on the edge of the cylinder bottom tray. 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, and an annular gap is formed between the two. The cross-section of the annular guard plate is an inverted "L" shape. The annular guard plate is fixed in 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, and the outer ring of the self-aligning bearing is interference fit 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 fit with the inner ring of the self-aligning bearing.

8. A vertical spiral stirring mill device according to claim 7, characterized in that: A shaft shoulder is provided on the stirring shaft located above the self-aligning bearing, and a bearing retaining ring and a gasket are installed between the upper end surface of the self-aligning bearing and the shaft shoulder of the middle stirring shaft. The bearing retaining ring is an "L"-shaped retaining ring, and the outer side surface of the bearing retaining ring is interference fit with the circular hole wall of the guard plate, and the inner hole of the bearing retaining ring is clearance fit with the middle stirring shaft. The gasket is installed above the bearing retaining ring, and the gasket is clearance fit with the middle stirring shaft. The inner diameter of the gasket is smaller than the inner diameter of the bearing retaining ring, and the outer diameter of the gasket is larger than the outer diameter of the vertical section of the bearing retaining ring.

9. A vertical spiral stirring mill device according to claim 7, characterized in that: A connecting rod bracket is arranged between the annular guard plate and the drum bottom tray, and the connecting rod bracket consists of a circular ring and a connecting rod. The circular ring is sleeved on the outside of the vertical section of the annular guard plate and the two are clearance-fitted. Multiple connecting rods are radially fixed on the circular ring, and the ends of the connecting rods are fixedly connected to the annular bottom edge of the spiral stirring frame by bolts.

10. A vertical spiral stirring mill device according to claim 7, characterized in that: The annular bottom edge of the spiral stirring frame covers the annular gap between the annular guard plate and the drum bottom tray. The annular bottom edge of the spiral stirring frame contacts the vertical edges of the annular guard plate and the drum bottom tray on the inside and outside respectively, and forms mutually matching boss structures on the contact surfaces respectively, and the cross-section of the boss structure is a trapezoid.

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