A vertical rotating self-grading stirring mill

Abstract

A vertical rotary self-grading stirred mill belongs to the field of grinding technology in mineral processing and includes a support system, a rotation system, a stirring system, a grading system, a circulation system, a grinding medium, and a grinding chamber. Gears drive the barrel to rotate, and the barrel's direction of rotation is controlled opposite to the direction of the stirring shaft within the barrel grinding chamber. This not only enhances the grading effect during the grinding process, but also prevents steel balls from accumulating and becoming stationary near the inner wall of the barrel bottom and not participating in the grinding process. Through multi-chamber grinding and the addition of diaphragm grading plates between the grinding chambers, the stirred mill adds a self-grading function, improving its operating efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of grinding in mineral processing, and in particular relates to a vertical rotating self-grading stirring mill. Background Art

[0002] A vertical spiral stirred mill utilizes the rotational motion of spiral agitator blades to circulate the grinding media and slurry within the mill. The energy required for grinding is provided by gravity, centrifugal force, and friction between the grinding media and the material, thereby grinding the ore particles. Simultaneously, the different motion patterns of the grinding media and the material create velocity gradients, resulting in varying forces acting on the material, ultimately reducing its size and changing its shape. Unlike other mills, the lifting action of the spiral agitator allows fine material to exit the grinding cycle more easily than coarse material, thereby directing mill energy toward the coarse material that requires more grinding, resulting in higher grinding efficiency.

[0003] However, existing vertical spiral stirred mills have a single grinding chamber, resulting in a single grinding fineness and no grading capability. Furthermore, the steel balls near the grinding chamber are farther away from the spiral stirring paddles, resulting in a lower speed and no participation in grinding the material, thus reducing the efficiency of the vertical spiral stirred mill. Therefore, it is necessary to explore new stirred mill structures. Summary of the Invention

[0004] The present invention provides a vertical rotary self-grading stirred mill, which improves the grinding efficiency of the grinding chamber by adding a rotary motion to the cylinder; through multi-chamber grinding and adding a diaphragm grading plate between the grinding chambers, the stirred mill is given a self-grading function, thereby improving the working efficiency of the vertical stirred mill.

[0005] In order to achieve the above objectives, the main technical solutions adopted by the present invention include:

[0006] A vertical rotating self-grading stirring mill comprises a support system, a rotation system, a stirring system, a grading system, a circulation system, a grinding medium, and a grinding chamber; wherein the support system comprises a base, four vertical plates, an upper cover plate, and a cylinder rotating shaft; the rotation system comprises a cylinder, a rotating shaft bearing pair, an axial bearing, a driving gear, a driven gear, a middle bearing, a main motor, and a wear-resistant liner; the stirring system comprises a first stirring shaft, a second stirring shaft, a third stirring shaft, a first propeller blade, a second propeller blade, a third propeller blade, a first stirring shaft bearing pair, a second stirring shaft bearing pair, a third stirring shaft bearing pair, a first drive motor, a second drive motor, and a third drive motor; the grading system comprises a primary diaphragm grading plate, a secondary diaphragm grading plate, and a partition; the circulation system comprises a feed port, a discharge port, a No. 1 hatch, a No. 2 hatch, and a No. 3 hatch; the grinding medium comprises large steel balls, medium steel balls, and small steel balls; the grinding chamber comprises a first grinding chamber, a second grinding chamber, and a third grinding chamber;

[0007] Furthermore, the base, surrounding vertical plates and upper cover plate of the support system are fixedly connected by welding, the base is fixed to the base by pouring concrete, and the cylinder rotating shaft is fixed to the base by welding; a circular hole is opened at the center position of the upper end face and the lower end face of the cylinder, and a rotating shaft bearing pair is installed inside the circular hole, the outer ring of the bearing is interference fit with the circular hole, and the inner ring of the bearing is connected to the rotating shaft of the cylinder, and the cylinder rotates around the rotating shaft of the cylinder through the rotating shaft bearing pair; a driven gear is welded to the middle part of the cylindrical surface of the cylinder, and a driving gear is installed on the upper cover plate. The driving gear and the driven gear are both bevel gears and mesh with each other, and the rotation of the cylinder is realized by the main motor drive; an axial bearing is installed between the bottom of the cylinder and the base, which supports the cylinder on the one hand and reduces the friction between the cylinder and the base when it rotates on the other hand; the cylinder and the upper cover plate are connected through a middle bearing, the inner ring of the middle bearing is installed on the cylinder, and the outer ring is installed on the upper cover plate to ensure stable rotation of the cylinder;

[0008] Furthermore, the interior of the cylinder is divided into a first grinding chamber, a second grinding chamber, and a third grinding chamber by a grading system. A hatch is opened on the cylindrical surface of the cylinder corresponding to each grinding chamber for maintenance, including hatch No. 1, hatch No. 2, and hatch No. 3. A wear-resistant lining is welded on the inner wall of each grinding chamber; the large steel balls, medium steel balls, and small steel balls are placed in the first grinding chamber, the second grinding chamber, and the third grinding chamber respectively, the diameter of the large steel balls is larger than the diameter of the medium steel balls, and the diameter of the medium steel balls is larger than the diameter of the small steel balls; the first stirring shaft, the second stirring shaft, and the third stirring shaft are sequentially passed through the first stirring shaft bearing pair, the second stirring shaft bearing pair, and the third stirring shaft. The stirring shaft bearing pairs are evenly installed on the upper and lower end surfaces of the cylinder; the first stirring shaft, the second stirring shaft, and the third stirring shaft are respectively welded with a first propeller blade, a second propeller blade, and a third propeller blade; the first stirring shaft, the second stirring shaft, and the third stirring shaft are respectively driven by a first drive motor, a second drive motor, and a third drive motor, each stirring shaft is relatively independent and rotates at a different speed to meet the grinding speed requirements of different particle sizes; the rotation direction of the cylinder is opposite to that of the three stirring shafts. From a top view, the cylinder rotates counterclockwise, and the first stirring shaft, the second stirring shaft, and the third stirring shaft rotate clockwise;

[0009] Furthermore, the first-level diaphragm grading plate and the second-level diaphragm grading plate are arranged between the inner wall of the cylinder and the rotating shaft of the cylinder, and the abrasive is screened by pasting a diaphragm with circular holes on the perforated steel plate structure, wherein the circular hole diameter of the first-level diaphragm grading plate is larger than the circular hole diameter of the second-level diaphragm grading plate, and the diaphragm is a steel plate without a perforation, welded between the inner wall of the cylinder and the rotating shaft of the cylinder; the feed port is a hole from the top end of the rotating shaft of the cylinder leading to the first grinding chamber, and the discharge port is a hole at the lower end of the rotating shaft of the cylinder located in the third grinding chamber, leading to the axis and the base in sequence, and is horizontally led out from the base to the outside of the cylinder, thereby realizing discharge.

[0010] Furthermore, the first grinding chamber is connected to the feed port, and the slurry flows into the first grinding chamber through the feed port. When the diameter of the particles inside the slurry is ground to a diameter smaller than the circular hole diameter of the first-level diaphragm grading plate, the particles inside the slurry will pass through the first-level diaphragm grading plate to reach the second grinding chamber. When the diameter of the particles inside the slurry is ground to a diameter smaller than the circular hole diameter of the second-level diaphragm grading plate, the particles inside the slurry will pass through the second-level diaphragm grading plate to reach the third grinding chamber, and finally the finished product flows out from the discharge port.

[0011] The beneficial effects of the present invention are:

[0012] 1. The cylinder is driven to rotate by gears, and the direction of the cylinder is controlled to be opposite to the direction of the stirring shaft in the cylinder grinding chamber. This not only enhances the grading effect during the grinding process, but also prevents the steel balls near the cylinder from accumulating and not participating in the grinding, greatly improving the working efficiency of the vertical stirred mill.

[0013] 2. The internal space of the cylinder is divided into three grinding chambers by the first-level diaphragm grading plate, the second-level diaphragm grading plate and the partition. The particle size is automatically graded according to its particle size, and the three grinding chambers work synchronously, which improves the working efficiency of the vertical stirred mill;

[0014] 3. The feed port and the discharge port are located at the center of the rotating axis of the cylinder. During the rotation of the cylinder, the feed port and the discharge port are not affected. The feed port is connected to the first grinding chamber, and the discharge port is connected to the third grinding chamber. Feeding and discharging can be detected at any time.

[0015] 4. By installing a middle bearing between the cylinder and the upper cover, the cylinder is prevented from shaking left and right during operation, thereby improving the stability of the overall structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the vertical rotating self-grading stirring mill of the present invention.

[0017] Figure 2 It is a schematic diagram of the internal structure of the vertical rotating self-grading stirring mill of the present invention.

[0018] Figure 3This is a distribution diagram of the internal grinding chamber of the vertical rotary self-grading stirring mill of the present invention.

[0019] Figure 4 This is a schematic diagram of the internal diaphragm grading plate of the vertical rotating self-grading stirred mill of the present invention.

[0020] Description of reference numerals:

[0021] 100 is the support system, 200 is the rotation system, 300 is the stirring system, 400 is the classification system, 500 is the circulation system, 600 is the grinding medium, 700 is the grinding chamber, 101 is the base, 102 is the surrounding vertical plates, 103 is the upper cover plate, 104 is the cylinder rotating shaft, 201 is the cylinder, 202 is the rotating shaft bearing pair, 203 is the axial bearing, 204 is the driving gear, 205 is the driven gear, 206 is the middle bearing, 207 is the main motor, 208 is the wear-resistant lining, 301 is the first stirring shaft, 302 is the second stirring shaft, 303 is the third stirring shaft, 304 is the first propeller blade, 305 is the second propeller blade, 306 is the third propeller blade, 307 is the first stirring shaft bearing pair, 308 is the second stirring shaft bearing pair, 309 is the third stirring shaft bearing pair, 310 is the first drive motor, 311 is the second drive motor, 312 is the third drive motor, 401 is the first diaphragm grading plate, 402 is the second diaphragm grading plate, 403 is the partition, 501 is the feed port, 502 is the discharge port, 503 is the No. 1 hatch, 504 is the No. 2 hatch, 505 is the No. 3 hatch, 601 is the large steel ball, 602 is the medium steel ball, 603 is the small steel ball, 701 is the first grinding chamber, 702 is the second grinding chamber, and 703 is the third grinding chamber. DETAILED DESCRIPTION

[0022] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation methods in conjunction with the accompanying drawings.

[0023] like Figures 1 to 4As shown, it includes a support system 100, a rotation system 200, a stirring system 300, a grading system 400, a circulation system 500, a grinding medium 600, and a grinding chamber 700; wherein the support system 100 includes a base 101, four vertical plates 102, an upper cover 103, and a cylinder rotating shaft 104; the rotation system 200 includes a cylinder 201, a rotating shaft bearing pair 202, an axial bearing 203, a driving gear 204, a driven gear 205, a middle bearing 206, a main motor 207, and a wear-resistant lining 208; the stirring system 300 includes a first stirring shaft 301, a second stirring shaft 302, a third stirring shaft 303, a first propeller blade 304, and a second propeller blade 305. , a third propeller blade 306, a first stirring shaft bearing pair 307, a second stirring shaft bearing pair 308, a third stirring shaft bearing pair 309, a first drive motor 310, a second drive motor 311, and a third drive motor 312; the grading system 400 includes a primary diaphragm grading plate 401, a secondary diaphragm grading plate 402, and a partition 403; the circulation system 500 includes a feed port 501, a discharge port 502, a hatch 1 503, a hatch 2 504, and a hatch 3 505; the grinding media 600 includes a large steel ball 601, a medium steel ball 602, and a small steel ball 603; and the grinding chamber 700 includes a first grinding chamber 701, a second grinding chamber 702, and a third grinding chamber 703;

[0024] Furthermore, the base 101, the surrounding vertical plates 102, and the upper cover plate 103 of the support system 100 are fixedly connected by welding, the base 101 is fixed to the base by pouring concrete, and the cylinder rotating shaft 104 is fixed to the base 101 by welding; a circular hole is opened at the center position of the circle of the upper end face and the lower end face of the cylinder 201, and a rotating shaft bearing pair 202 is installed inside the circular hole. The outer ring of the bearing is interference fit with the circular hole, and the inner ring of the bearing is connected to the cylinder rotating shaft 104. The cylinder 201 rotates around the cylinder rotating shaft 104 through the rotating shaft bearing pair 202; the middle part of the cylindrical surface of the cylinder 201 is welded There is a driven gear 205, and a driving gear 204 is installed on the upper cover 103. The driving gear 204 and the driven gear 205 are both bevel gears and mesh with each other. The main motor 207 drives the cylinder 201 to rotate. An axial bearing 203 is installed between the bottom of the cylinder 201 and the base 101. On the one hand, it supports the cylinder 201, and on the other hand, it reduces the friction between the cylinder 201 and the base 101 during rotation. The cylinder 201 is connected to the upper cover 103 through a middle bearing 206. The inner ring of the middle bearing 206 is installed on the cylinder 201, and the outer ring is installed on the upper cover 103 to ensure the stability of the cylinder 201 during rotation.

[0025] Furthermore, the interior of the cylinder 201 is divided into a first grinding chamber 701, a second grinding chamber 702, and a third grinding chamber 703 by a grading system 400. A hatch is opened on the cylindrical surface of the cylinder 201 corresponding to each grinding chamber for maintenance, including hatch No. 1 503, hatch No. 2 504, and hatch No. 3 505. A wear-resistant lining 208 is welded on the inner wall of the cylinder 201 in each grinding chamber; the large steel balls 601, medium steel balls 602, and small steel balls 603 are respectively placed in the first grinding chamber 701, the second grinding chamber 702, and the third grinding chamber 703, the large steel balls 601 having a diameter greater than that of the medium steel balls 602, and the medium steel balls 602 having a diameter greater than that of the small steel balls 603; the first stirring shaft 301, the second stirring shaft 302, and the third stirring shaft 303 are sequentially passed through the first stirring shaft bearing pair 307, the second stirring shaft bearing pair 308, and the second stirring shaft bearing pair 309. The stirring shaft bearing pair 308 and the third stirring shaft bearing pair 309 are evenly installed on the upper and lower end surfaces of the cylinder 201; the first stirring shaft 301, the second stirring shaft 302, and the third stirring shaft 303 are respectively welded with a first propeller blade 304, a second propeller blade 305, and a third propeller blade 306; the first stirring shaft 301, the second stirring shaft 302, and the third stirring shaft 303 are respectively driven by a first drive motor 310, a second drive motor 311, and a third drive motor 312, each stirring shaft is relatively independent and rotates at a different speed to meet the requirements of grinding speed for different particle sizes; the rotation direction of the cylinder 201 is opposite to that of the three stirring shafts. From a top view, the cylinder 201 rotates counterclockwise, and the first stirring shaft 301, the second stirring shaft 302, and the third stirring shaft 303 rotate clockwise;

[0026] Furthermore, the first-level diaphragm grading plate 401 and the second-level diaphragm grading plate 402 are arranged between the inner wall of the cylinder and the cylinder rotating shaft, and the abrasive is screened by pasting a diaphragm with circular holes on the perforated steel plate structure, wherein the circular hole diameter of the first-level diaphragm grading plate 401 is larger than the circular hole diameter of the second-level diaphragm grading plate 402, and the diaphragm 403 is a steel plate without a hole, welded between the inner wall of the cylinder 201 and the cylinder rotating shaft 104; the feed port 501 is a hole from the top end of the cylinder rotating shaft 104 leading to the first grinding chamber 701, and the discharge port 502 is a hole at the lower end of the cylinder rotating shaft 104 located in the third grinding chamber 703, which leads to the axis and the base 101 in sequence, and is horizontally led out from the base 101 to the outside of the cylinder 201, thereby realizing discharge.

[0027] Furthermore, the first grinding chamber 701 is connected to the feed port 501, and the slurry flows into the first grinding chamber 701 through the feed port 501. When the diameter of the particles inside the slurry is ground to a diameter smaller than the circular hole diameter of the first diaphragm grading plate 401, the particles inside the slurry will pass through the first diaphragm grading plate 401 to reach the second grinding chamber 702. When the diameter of the particles inside the slurry is ground to a diameter smaller than the circular hole diameter of the second diaphragm grading plate 402, the particles inside the slurry will pass through the second diaphragm grading plate 402 to reach the third grinding chamber 703, and finally the finished product flows out from the discharge port 502.

[0028] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may alter, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A vertical rotating self-grading stirring mill, characterized in that: It includes a support system, a rotation system, a stirring system, a grading system, a circulation system, a grinding medium, and a grinding chamber; wherein the support system includes a base, four vertical plates, an upper cover plate, and a cylinder rotating shaft; the rotation system includes a cylinder, a rotating shaft bearing pair, an axial bearing, a driving gear, a driven gear, a middle bearing, a main motor, and a wear-resistant liner; the stirring system includes a first stirring shaft, a second stirring shaft, a third stirring shaft, a first propeller blade, a second propeller blade, a third propeller blade, a first stirring shaft bearing pair, a second stirring shaft bearing pair, a third stirring shaft bearing pair, a first drive motor, a second drive motor, and a third drive motor; the grading system includes a first-level diaphragm grading plate, a second-level diaphragm grading plate, and a partition; the circulation system includes a feed port, a discharge port, hatch No. 1, hatch No. 2, and hatch No. 3; the grinding medium includes large steel balls, medium steel balls, and small steel balls; and the grinding chamber includes a first grinding chamber, a second grinding chamber, and a third grinding chamber; The base, surrounding vertical plates and upper cover plate of the support system are fixedly connected by welding, and the base is fixed to the base by pouring concrete, and the cylinder rotating shaft is fixed to the base by welding; a circular hole is opened at the center position of the upper end face and the lower end face of the cylinder, and a rotating shaft bearing pair is installed inside the circular hole, the outer ring of the bearing is interference fit with the circular hole, and the inner ring of the bearing is connected to the rotating shaft of the cylinder, and the cylinder rotates around the rotating shaft of the cylinder through the rotating shaft bearing pair; a driven gear is welded to the middle part of the cylindrical surface of the cylinder, and a driving gear is installed on the upper cover plate, and the driving gear and the driven gear are both bevel gears and mesh with each other, and the rotation of the cylinder is realized by the main motor drive; an axial bearing is installed between the bottom of the cylinder and the base, on the one hand supporting the cylinder, and on the other hand reducing the friction between the cylinder and the base when rotating; the cylinder and the upper cover plate are connected through a middle bearing, the inner ring of the middle bearing is installed on the cylinder, and the outer ring is installed on the upper cover plate to ensure stable rotation of the cylinder; The interior of the cylinder is divided into a first grinding chamber, a second grinding chamber, and a third grinding chamber by a grading system. A hatch is opened on the cylindrical surface of the cylinder corresponding to each grinding chamber for maintenance, including hatch No. 1, hatch No. 2, and hatch No.

3. A wear-resistant lining is welded on the inner wall of each grinding chamber; the large steel balls, medium steel balls, and small steel balls are respectively placed in the first grinding chamber, the second grinding chamber, and the third grinding chamber. The diameter of the large steel balls is larger than that of the medium steel balls, and the diameter of the medium steel balls is larger than that of the small steel balls; the first stirring shaft, the second stirring shaft, and the third stirring shaft are sequentially passed through the first stirring shaft bearing pair, the second stirring shaft bearing pair, and the third stirring shaft. The shaft bearing pairs are evenly installed on the upper and lower end surfaces of the cylinder; the first propeller blade, the second propeller blade, and the third propeller blade are welded on the first stirring shaft, the second stirring shaft, and the third stirring shaft respectively; the first stirring shaft, the second stirring shaft, and the third stirring shaft are driven by the first drive motor, the second drive motor, and the third drive motor respectively, and each stirring shaft is relatively independent and rotates at a different speed to meet the grinding speed requirements of different particle sizes; the rotation direction of the cylinder is opposite to that of the three stirring shafts. From a top view, the cylinder rotates counterclockwise, and the first stirring shaft, the second stirring shaft, and the third stirring shaft rotate clockwise; The first-level diaphragm grading plate and the second-level diaphragm grading plate are arranged between the inner wall of the cylinder and the rotating shaft of the cylinder. The abrasive is screened by pasting a diaphragm with circular holes on the perforated steel plate structure, wherein the circular hole diameter of the first-level diaphragm grading plate is larger than the circular hole diameter of the second-level diaphragm grading plate. The diaphragm is a steel plate without a hole, welded between the inner wall of the cylinder and the rotating shaft of the cylinder; the feed port is a hole from the top end of the rotating shaft of the cylinder leading to the first grinding chamber, and the discharge port is a hole at the lower end of the rotating shaft of the cylinder located in the third grinding chamber, leading to the axis and the base in sequence, and then horizontally led out from the base to the outside of the cylinder, thereby realizing discharge.

2. A vertical rotating self-classifying stirring mill according to claim 1, characterized in that: The first grinding chamber is connected to the feed port, and the slurry flows into the first grinding chamber through the feed port. When the diameter of the particles inside the slurry is ground to a diameter smaller than the circular hole diameter of the first diaphragm grading plate, the particles inside the slurry will pass through the first diaphragm grading plate to reach the second grinding chamber. When the diameter of the particles inside the slurry is ground to a diameter smaller than the circular hole diameter of the second diaphragm grading plate, the particles inside the slurry will pass through the second diaphragm grading plate to reach the third grinding chamber, and finally the finished product flows out from the discharge port.

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