A coarse ore return system for a ball mill

Abstract

The present invention relates to the field of ore mining technology, and in particular to a coarse-grained ore return system of a ball mill, comprising a base, a ball mill body is fixedly mounted on the base, a feed pipe and a discharge pipe are fixedly mounted on both ends of the ball mill body, a screening barrel is fixedly mounted on the base through a support block, a mounting groove is provided on the surface of the screening barrel, a plurality of first screening holes are provided inside the mounting groove, an arc plate is slidably mounted in the mounting groove, a plurality of second screening holes are provided on the surface of the arc plate, and an adjustment component is provided on the screening barrel. The present invention can adjust the overlap between the second screening holes on the arc plate and the first screening holes on the screening barrel. When the first screening holes and the second screening holes overlap more, ores with larger diameters can be screened out. When the first screening holes and the second screening holes overlap less, only ores with smaller diameters can be screened out. There is no need to replace different machines, and the operation is simple and the practicability is high.

Description

Technical Field

[0001] The invention relates to the technical field of ore mining, and in particular to a coarse ore return system of a ball mill. Background Art

[0002] As the first stage grinding and classification of the ore dressing plant has been gradually changed from the closed-circuit system composed of the original ball mill and spiral classifier to a closed-circuit system composed of a ball mill and a cyclone group, the return of coarse-grained ore has become a technical problem. If the coarse-grained ore directly enters the grinding and classification system, it will cause a lot of wear on the cyclone feed pump, feed pipeline, distributor, sand settling nozzle and other parts, and even directly affect the normal production. The common practice in the industry is to install a spiral screen at the discharge end of the ball mill to screen out the coarse-grained ore.

[0003] Chinese patent publication number CN213644336U discloses a coarse ore return system for a ball mill, which can transport the screened coarse ore back to the inside of the ball mill for secondary ball milling to avoid the accumulation of coarse ore.

[0004] In the above patent document, the aperture of the screening hole of the screening tube cannot be adjusted. During screening, only the ore that can pass through the screening hole can be screened out. When coarser or finer ore needs to be screened, a different machine needs to be replaced, which is troublesome to use and not very practical. Summary of the invention

[0005] The purpose of the present invention is to solve the following shortcomings in the prior art: during screening, only the ores that can pass through the screening holes can be screened out, and when it is necessary to screen coarser or finer ores, different machines need to be replaced for use, which is more troublesome to use and has low practicality. A coarse ore return system for a ball mill is proposed.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A coarse ore return system for a ball mill comprises a base, a ball mill body is fixedly mounted on the base, a feed pipe and a discharge pipe are fixedly mounted at both ends of the ball mill body, and a feed funnel is fixedly mounted at the upper end of the feed pipe;

[0008] A screening barrel is fixedly mounted on the base through a support block, a mounting hole is provided at one end of the screening barrel, one end of the discharge pipe is rotatably mounted in the mounting hole, and a stirring component is provided in the discharge pipe for driving the ore to stir in the screening barrel;

[0009] An installation groove is provided on the surface of the screening barrel, and a plurality of first screening holes are provided inside the installation groove, all of which are connected to the screening barrel. An arc plate is slidably installed in the installation groove through a sliding component, and a plurality of second screening holes are provided on the surface of the arc plate. The plurality of first screening holes correspond to the plurality of second screening holes respectively, and an adjustment component for driving the arc plate to move is provided on the screening barrel.

[0010] As a preferred solution, the stirring assembly includes a plurality of support rods fixedly mounted at one end of the discharge pipe and a plurality of spiral scrapers fixedly mounted at one end of the plurality of support rods, and the plurality of spiral scrapers are in sliding contact with the inner wall of the screening barrel.

[0011] As a preferred solution, the sliding assembly includes two slide rails symmetrically fixedly installed on the screening barrel and multiple sliders symmetrically fixedly installed on the arc plate. Both slide rails are provided with slide holes, and the multiple sliders are slidably installed in the two slide holes respectively.

[0012] As a preferred solution, the adjustment assembly includes a fixed block fixedly mounted on the screening barrel, a threaded rod, a connecting block rotatably mounted on one end of the threaded rod, and an adjustment block fixedly mounted on the other end of the threaded rod, a threaded hole is opened on the fixed block, the threaded rod is threadedly inserted in the threaded hole, and the connecting block is fixedly mounted on the arc plate.

[0013] As a preferred solution, a vertical rod is vertically fixedly installed on the screening barrel, a lifting plate is vertically slidably installed on the vertical rod through an elastic component, rectangular rods are fixedly installed at both ends of the lifting plate, a plurality of impact rods are vertically fixedly installed on the lower surfaces of the two rectangular rods, and impact blocks are fixedly installed on the lower ends of the plurality of impact rods, and a transmission component for driving the lifting plate to move vertically upward is provided on the screening barrel.

[0014] As a preferred solution, the elastic component includes a round block fixedly mounted on the upper end of the vertical rod and a telescopic spring sleeved on the vertical rod, and two ends of the telescopic spring are respectively fixedly connected to the round block and the lifting plate.

[0015] As a preferred solution, the transmission assembly includes a support rod fixedly mounted on the discharge pipe, a trapezoidal block fixedly mounted at one end of the support rod, and a transmission rod horizontally fixedly mounted on the lifting plate, one end of the transmission rod intermittently slidingly contacts the inclined surface of the trapezoidal block.

[0016] As a preferred solution, a discharge plate is fixedly mounted on one end of the screening barrel away from the discharge pipe, a blocking component is provided at one end of the screening barrel, and a collecting box is provided below the screening barrel.

[0017] As a preferred solution, the sealing assembly includes two L-shaped positioning blocks symmetrically fixedly installed at one end of the screening barrel, a sealing plate slidably inserted between the two positioning blocks, an L-shaped metal block fixedly installed at the upper end of the sealing plate, and a magnet fixedly installed on the screening barrel, and the magnet is in contact with the metal block.

[0018] As a preferred solution, a belt conveyor is provided on the side of the base, one end of the belt conveyor is located directly above the feed hopper, and the other end of the belt conveyor is located directly below the screening barrel.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The arc plate is slidably installed in the installation groove through the sliding component. The first screening hole and the second screening hole overlap each other. The arc plate can be driven to move horizontally in the installation groove through the adjustment component, so as to adjust the overlap between the second screening hole on the arc plate and the first screening hole on the screening barrel. When the first screening hole and the second screening hole overlap more, ores with larger diameters can be screened out. When the first screening hole and the second screening hole overlap less, only ores with smaller diameters can be screened out. It can be adjusted according to the size of the required ore without changing different machines. It is simple to operate and highly practical.

[0021] 2. During the rotation of the discharge pipe, the transmission assembly, elastic assembly, vertical rod, lifting plate, rectangular rod and impact rod cooperate with each other to drive the impact block to continuously impact the screening barrel. Under the impact, the speed of ore passing through the screening hole can be accelerated, thereby improving the ore screening rate;

[0022] 3. During the screening process, the sealing plate can block one end of the screening barrel to prevent some ores with smaller diameters from flowing out of one end of the screening barrel, thereby ensuring that the ores in the screening barrel can be fully screened and improving the screening effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of a three-dimensional cross-sectional structure of a coarse-grained ore return system of a ball mill proposed by the present invention;

[0024] Figure 2 A schematic diagram of the three-dimensional structure of a screening bucket, a collecting box, a vertical rod, a lifting plate, a rectangular rod and a transmission assembly in a coarse ore return system of a ball mill proposed by the present invention;

[0025] Figure 3 for Figure 1 The enlarged structural diagram at A in the middle;

[0026] Figure 4 A schematic diagram of the three-dimensional structure of a screening barrel in a coarse-grained ore return system of a ball mill proposed by the present invention;

[0027] Figure 5 for Figure 4 The enlarged structural diagram at B in the middle;

[0028] Figure 6 for Figure 4 The enlarged structural diagram at C in the middle;

[0029] Figure 7 A schematic diagram of a three-dimensional explosion structure of a screening bucket in a coarse-grained ore return system of a ball mill proposed by the present invention;

[0030] Figure 8 This is a schematic diagram of a three-dimensional partial cross-sectional structure of a screening barrel in a coarse-grained ore return system of a ball mill proposed by the present invention.

[0031] In the figure: 1 base, 2 ball mill body, 3 feed pipe, 4 discharge pipe, 5 feed funnel, 6 support block, 7 screening barrel, 8 mounting groove, 9 first screening hole, 10 arc plate, 11 second screening hole, 12 support rod, 13 spiral scraper, 14 slide rail, 15 slider, 16 fixed block, 17 threaded rod, 18 connecting block, 19 adjustment block, 20 vertical rod, 21 lifting plate, 22 rectangular rod, 23 impact rod, 24 impact block, 25 round block, 26 telescopic spring, 27 support rod, 28 trapezoidal block, 29 transmission rod, 30 discharge plate, 31 collection box, 32 positioning block, 33 sealing plate, 34 metal block, 35 magnet, 36 belt conveyor. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0033] Reference Figure 1-Figure 8 A coarse ore return system of a ball mill comprises a base 1, a ball mill body 2 is fixedly mounted on the base 1, a feed pipe 3 and a discharge pipe 4 are fixedly mounted at both ends of the ball mill body 2, and a feed funnel 5 is fixedly mounted on the upper end of the feed pipe 3;

[0034] The ore enters the feed pipe 3 through the feed funnel 5 , and then enters the ball mill through the feed pipe 3 to be ground. The ground ore enters the discharge pipe 4 .

[0035] A screening barrel 7 is fixedly mounted on the base 1 through a support block 6. A mounting hole is provided at one end of the screening barrel 7. One end of the discharge pipe 4 is rotatably mounted in the mounting hole. A stirring assembly for driving the ore to stir in the screening barrel 7 is provided in the discharge pipe 4. The stirring assembly includes a plurality of support rods 12 fixedly mounted at one end of the discharge pipe 4 and a plurality of spiral scrapers 13 fixedly mounted at one end of the plurality of support rods 12. The plurality of spiral scrapers 13 are all in sliding contact with the inner wall of the screening barrel 7.

[0036] One end of the discharge pipe 4 is rotatably installed in a mounting hole opened at one end of the screening barrel 7. During the rotation of the discharge pipe 4, the ore in the ball mill will continuously enter the screening barrel 7. When the discharge pipe 4 rotates relative to the screening barrel 7, one end of the discharge pipe 4 will drive the spiral scraper 13 to rotate in the screening barrel 7 through the support rod 12, thereby driving the ore in the screening barrel 7 to be stirred through the spiral scraper 13.

[0037] A mounting groove 8 is provided on the surface of the screening barrel 7, and a plurality of first screening holes 9 which are all connected to the screening barrel 7 are provided inside the mounting groove 8. An arc plate 10 is slidably installed in the mounting groove 8 through a sliding component, and a plurality of second screening holes 11 are provided on the surface of the arc plate 10. The plurality of first screening holes 9 correspond to the plurality of second screening holes 11 respectively, and an adjusting component for driving the arc plate 10 to move is provided on the screening barrel 7.

[0038] While the ore is continuously stirred in the screening barrel 7, it will pass through the first screening hole 9 and the second screening hole 11, thereby realizing screening. The first screening hole 9 and the second screening hole 11 overlap together, and the arc plate 10 can be driven to move horizontally in the mounting groove 8 by the adjustment component, so as to adjust the overlap between the second screening hole 11 on the arc plate 10 and the first screening hole 9 on the screening barrel 7. When the first screening hole 9 and the second screening hole 11 overlap more, ores with larger diameters can be screened out. When the first screening hole 9 and the second screening hole 11 overlap less, only ores with smaller diameters can be screened out. Adjustment can be made according to the size of the required ore without changing different machines. The operation is simple and the practicability is high.

[0039] The sliding assembly includes two slide rails 14 symmetrically fixedly installed on the screening barrel 7 and multiple sliders 15 symmetrically fixedly installed on the arc plate 10. Both slide rails 14 are provided with slide holes. Multiple sliders 15 are respectively slidably installed in the two slide holes. The sliders 15 are slidably installed on the slide rails 14. The slide rails 14 and the sliders 15 support the arc plate 10, so that the arc plate 10 can move horizontally in the installation groove 8.

[0040] The adjusting assembly includes a fixed block 16 fixedly mounted on the screening barrel 7, a threaded rod 17, a connecting block 18 rotatably mounted on one end of the threaded rod 17, and an adjusting block 19 fixedly mounted on the other end of the threaded rod 17. A threaded hole is provided on the fixed block 16, and the threaded rod 17 is threadedly inserted in the threaded hole. The connecting block 18 is fixedly mounted on the arc plate 10. Since the threaded rod 17 is threadedly inserted in the threaded hole, when the adjusting block 19 is rotated, the threaded rod 17 is driven to rotate. Under the action of the threaded hole, the threaded rod 17 can be driven to move horizontally on the fixed block 16. When the threaded rod 17 moves, it will drive the arc plate 10 to move in the mounting groove 8 through the connecting block 18. When the arc plate 10 moves, the overlap degree of the first screening hole 9 and the second screening hole 11 can be adjusted.

[0041] A vertical rod 20 is vertically fixedly installed on the screening barrel 7, and a lifting plate 21 is vertically slidably installed on the vertical rod 20 through an elastic component. Rectangular rods 22 are fixedly installed at both ends of the lifting plate 21, and multiple impact rods 23 are vertically fixedly installed on the lower surfaces of the two rectangular rods 22. Impact blocks 24 are fixedly installed at the lower ends of the multiple impact rods 23. A transmission component for driving the lifting plate 21 to move vertically upward is provided on the screening barrel 7. The elastic component includes a round block 25 fixedly installed on the upper end of the vertical rod 20 and a telescopic spring 26 sleeved on the vertical rod 20. The two ends of the telescopic spring 26 are fixedly connected to the round block 25 and the lifting plate 21 respectively. Under the action of the elastic force of the telescopic spring 26, the lifting plate 21 has a tendency to move vertically downward. The lifting plate 21 moves vertically up and down on the vertical rod 20. When the lifting plate 21 moves vertically upward, the telescopic spring 26 is compressed.

[0042] The transmission assembly includes a support rod 27 fixedly mounted on the discharge pipe 4, a trapezoidal block 28 fixedly mounted at one end of the support rod 27, and a transmission rod 29 horizontally fixedly mounted on the lifting plate 21, one end of the transmission rod 29 intermittently slidingly contacts the inclined surface of the trapezoidal block 28;

[0043] When the discharge pipe 4 rotates on the screening barrel 7, the trapezoidal block 28 will be driven to rotate around the discharge pipe 4 through the support rod 27. During the rotation of the trapezoidal block 28, it will contact the transmission rod 29. At this time, the transmission rod 29 will move vertically upward along the inclined surface of the trapezoidal block 28 on the screening barrel 7, and then drive the lifting plate 21 to move vertically upward through the transmission rod 29. The telescopic spring 26 is compressed until the trapezoidal block 28 is separated from the transmission rod 29. At this time, under the action of the elastic force of the telescopic spring 26, the lifting plate 21 will quickly move vertically downward, driving the two rectangular rods 22 and multiple impact rods 23 to move vertically downward, and driving the impact block 24 to impact the screening barrel 7. Under the impact, the speed at which the ore passes through the screening hole can be accelerated, thereby improving the ore screening rate.

[0044] A discharge plate 30 is fixedly installed at one end of the screening barrel 7 away from the discharge pipe 4, a plugging assembly is provided at one end of the screening barrel 7, and a collecting box 31 is provided below the screening barrel 7. The plugging assembly includes two L-shaped positioning blocks 32 symmetrically fixedly installed at one end of the screening barrel 7, a sealing plate 33 slidably inserted between the two positioning blocks 32, an L-shaped metal block 34 fixedly installed at the upper end of the sealing plate 33, and a magnet 35 fixedly installed on the screening barrel 7. The magnet 35 contacts the metal block 34, and the ore screened from the screening barrel 7 will be collected in the collecting box 31, which is convenient for later processing;

[0045] The sealing plate 33 is slidably inserted between the two positioning blocks 32, and the side of the sealing plate 33 contacts one end of the screening barrel 7, thereby blocking one end of the screening barrel 7, and the metal block 34 installed on the sealing plate 33 contacts the magnet 35. Under the action of magnetic force, the sealing plate 33 is fixed between the two positioning blocks 32. During screening, the sealing plate 33 prevents the ore in the screening barrel 7 from flowing out, ensuring that the ore in the screening barrel 7 can be fully screened, thereby improving the screening effect. When the ore is fully screened, the metal block 34 is pulled upward to separate the metal block 34 from the magnet 35, and then the sealing plate 33 is taken out from between the two positioning blocks 32. At this time, under the action of the spiral scraper 13, the ore in the screening barrel 7 will be driven to flow out of the screening barrel 7.

[0046] A belt conveyor 36 is provided on the side of the base 1, one end of the belt conveyor 36 is located directly above the feed hopper 5, and the other end is located directly below the screening barrel 7. The ore flowing out of the screening barrel 7 will fall onto the belt conveyor 36 (the belt conveyor 36 is a prior art and will not be introduced in detail here). Under the action of the belt conveyor 36, the coarse-grained ore can be transported to the feed hopper 5 for secondary ball milling.

[0047] In the present invention, the arc plate 10 is horizontally slidably installed in the installation groove 8 through the sliding assembly. At the same time, under the action of the adjusting assembly, the arc plate 10 can be driven to move horizontally in the installation groove 8. When the ore comes out of the ball mill and enters the screening barrel 7, under the action of the stirring assembly, the ore in the screening barrel 7 will pass through the first screening hole 9 and the second screening hole 11, thereby achieving screening;

[0048] When it is necessary to screen coarser or finer ores, the adjusting block 19 is rotated to drive the threaded rod 17 to rotate. Under the action of the fixed block 16, the arc plate 10 is driven to move in the installation slot 8, and the first screening hole 9 and the second screening hole 11 overlap together. When the arc plate 10 moves horizontally in the installation slot 8, the first screening hole 9 and the second screening hole 11 will be staggered with each other, thereby changing the overlap between the second screening hole 11 and the first screening hole 9. When the first screening hole 9 and the second screening hole 11 overlap more, ores with larger diameters can be screened out. When the first screening hole 9 and the second screening hole 11 overlap less, only ores with smaller diameters can be screened out. Adjustment can be made according to the size of the required ore without changing different machines. The operation is simple and the practicability is high.

[0049] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A coarse ore return system for a ball mill, comprising a base (1), characterized in that: A ball mill body (2) is fixedly mounted on the base (1), a feed pipe (3) and a discharge pipe (4) are fixedly mounted at both ends of the ball mill body (2), and a feed hopper (5) is fixedly mounted at the upper end of the feed pipe (3); A screening barrel (7) is fixedly mounted on the base (1) via a support block (6); a mounting hole is provided at one end of the screening barrel (7); one end of the discharge pipe (4) is rotatably mounted in the mounting hole; a stirring assembly is provided in the discharge pipe (4) for driving the ore to be stirred in the screening barrel (7); The screening barrel (7) has a mounting groove (8) on its surface, a plurality of first screening holes (9) in communication with the screening barrel (7) are formed inside the mounting groove (8), an arc-shaped plate (10) is slidably mounted in the mounting groove (8) via a sliding assembly, a plurality of second screening holes (11) are formed on the surface of the arc-shaped plate (10), the plurality of first screening holes (9) respectively corresponding to the plurality of second screening holes (11), and an adjustment assembly for driving the arc-shaped plate (10) to move is provided on the screening barrel (7); A vertical rod (20) is vertically fixedly mounted on the screening barrel (7), a lifting plate (21) is vertically slidably mounted on the vertical rod (20) via an elastic component, rectangular rods (22) are fixedly mounted on both ends of the lifting plate (21), a plurality of impact rods (23) are vertically fixedly mounted on the lower surfaces of the two rectangular rods (22), and impact blocks (24) are fixedly mounted on the lower ends of the plurality of impact rods (23), and a transmission component for driving the lifting plate (21) to move vertically upward is provided on the screening barrel (7); The elastic component comprises a round block (25) fixedly mounted on the upper end of the vertical rod (20) and a telescopic spring (26) sleeved on the vertical rod (20), wherein two ends of the telescopic spring (26) are respectively fixedly connected to the round block (25) and the lifting plate (21); The transmission assembly comprises a support rod (27) fixedly mounted on the discharge pipe (4), a trapezoidal block (28) fixedly mounted on one end of the support rod (27), and a transmission rod (29) fixedly mounted horizontally on the lifting plate (21), one end of the transmission rod (29) intermittently slidingly contacting with the inclined surface of the trapezoidal block (28); The stirring assembly comprises a plurality of support rods (12) fixedly mounted on one end of the discharge pipe (4) and a plurality of spiral scrapers (13) fixedly mounted on one end of the plurality of support rods (12), wherein the plurality of spiral scrapers (13) are in sliding contact with the inner wall of the screening barrel (7); When the discharge pipe (4) rotates on the screening barrel (7), the support rod (27) drives the trapezoidal block (28) to rotate around the discharge pipe (4). During the rotation of the trapezoidal block (28), the trapezoidal block (28) contacts the transmission rod (29). At this time, the transmission rod (29) moves vertically upward along the inclined surface of the trapezoidal block (28) on the screening barrel (7). Then, the lifting plate (21) is driven to move vertically upward through the transmission rod (29). The telescopic spring (26) is compressed until the trapezoidal block (28) is separated from the transmission rod (29). At this time, under the action of the elastic force of the telescopic spring (26), the lifting plate (21) moves vertically downward rapidly, driving the two rectangular rods (22) and the plurality of impact rods (23) to move vertically downward, and driving the impact block (24) to impact the screening barrel (7).

2. A coarse ore return system for a ball mill according to claim 1, characterized in that: The sliding assembly comprises two slide rails (14) symmetrically fixedly mounted on the screening barrel (7) and a plurality of slide blocks (15) symmetrically fixedly mounted on the arc-shaped plate (10), wherein the two slide rails (14) are each provided with a slide hole, and the plurality of slide blocks (15) are respectively slidably mounted in the two slide holes.

3. The coarse ore return system of a ball mill according to claim 1, characterized in that: The adjustment assembly comprises a fixed block (16) fixedly mounted on the screening barrel (7), a threaded rod (17), a connecting block (18) rotatably mounted on one end of the threaded rod (17), and an adjustment block (19) fixedly mounted on the other end of the threaded rod (17); a threaded hole is formed on the fixed block (16), the threaded rod (17) is threadedly inserted into the threaded hole, and the connecting block (18) is fixedly mounted on the arc plate (10).

4. The coarse ore return system of a ball mill according to claim 1, characterized in that: A discharge plate (30) is fixedly mounted on one end of the screening barrel (7) away from the discharge pipe (4), a blocking component is provided at one end of the screening barrel (7), and a collecting box (31) is provided below the screening barrel (7).

5. A coarse ore return system for a ball mill according to claim 4, characterized in that: The blocking assembly comprises two L-shaped positioning blocks (32) symmetrically fixedly mounted at one end of the screening barrel (7), a sealing plate (33) slidably inserted between the two positioning blocks (32), an L-shaped metal block (34) fixedly mounted on the upper end of the sealing plate (33), and a magnet (35) fixedly mounted on the screening barrel (7), wherein the magnet (35) is in contact with the metal block (34).

6. A coarse ore return system for a ball mill according to claim 1, characterized in that: A belt conveyor (36) is provided on the side of the base (1), one end of the belt conveyor (36) is located directly above the feed hopper (5), and the other end of the belt conveyor (36) is located directly below the screening bucket (7).

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