Magnetic lining plate of ball mill and ball mill

Abstract

The utility model relates to a magnetic lining plate of a ball mill and the ball mill. The magnetic lining plate comprises a lining plate base material and a plurality of permanent magnetic sheets. The lining plate base material comprises a first surface and a second surface in the thickness direction. The permanent magnetic sheets are arranged in multiple rows and fixed to the first surface, the second surface is arranged to be an adsorption face capable of adsorbing magnetic substances, and the second surface is further provided with an anti-separation structure used for limiting the adsorbed substances to be separated from the second surface. According to the scheme, the service life of the lining plate can be prolonged, power consumption is saved, and cost such as lining plate loss is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of material crushing, and in particular to a magnetic liner of a ball mill and a ball mill. Background Art

[0002] Ball mill is a key equipment for crushing materials after crushing. It can be used to grind various ores and other materials. It is widely used in mineral processing, building materials, chemical industry and other industries. The grinding media in the ball mill rotates with the cylinder, thereby grinding the materials in the cylinder.

[0003] During the high-speed rotation of the ball mill, the grinding media and materials inside will inevitably damage the base of the ball mill equipment, so a liner is required to protect the ball mill. The liner of the ball mill is cast with manganese steel. During the grinding process, the liner wears itself to avoid wear of the ball mill body. For example, the average service life of a ball mill used for secondary grinding is about 450,000 tons, and the average replacement cycle is 1.5 years, which is a short service life. Summary of the invention

[0004] The present application provides a magnetic liner of a ball mill and a ball mill, which can extend the service life of the magnetic liner and the abrasive barrel.

[0005] A magnetic liner for a ball mill, comprising:

[0006] A liner substrate including a first surface and a second surface in a thickness direction; and

[0007] A plurality of permanent magnetic sheets are arranged in multiple rows and fixed on the first surface, the second surface is arranged as an adsorption surface capable of adsorbing magnetic material, and the second surface is also provided with an anti-detachment structure for limiting the adsorbed object from detaching from the second surface.

[0008] Optionally, the plurality of permanent magnetic sheets are arranged into at least a first row and a second row, the first row is adjacent to the second row, a first gap is left between adjacent permanent magnetic sheets in the first row, a second gap is left between adjacent permanent magnetic sheets in the second row, and the first gap is staggered with the second gap.

[0009] Optionally, the first surface is provided with a plurality of grooves, and each permanent magnetic sheet is arranged in each groove in a one-to-one correspondence.

[0010] Optionally, the magnetic lining plate comprises a cylinder magnetic lining plate used for being arranged on the cylinder body of the abrasive cylinder, and the permanent magnetic sheets on the cylinder magnetic lining plate are arranged in multiple rows and distributed along a straight line.

[0011] Optionally, the anti-separation structure includes a first rib provided on the second surface of the cylindrical magnetic lining and protruding along the thickness direction of the lining substrate, and the first rib is configured to extend along the axial direction of the cylindrical body.

[0012] Optionally, the magnetic lining plate further comprises an end cover magnetic lining plate provided on the end cover of the abrasive cylinder of the ball mill, and the permanent magnetic sheets on the end cover magnetic lining plate are arranged in multiple rows and in an arc shape.

[0013] Optionally, the permanent magnetic sheets on the end cover magnetic lining are arranged in multiple rows from the center of the end cover outwards, and the number of permanent magnetic sheets in a row farthest from the center of the end cover is greater than the number of permanent magnetic sheets in the remaining rows.

[0014] Optionally, the anti-separation structure includes a second rib provided on the second surface of the end cover magnetic lining and protruding along the thickness direction of the lining substrate, and the second rib is configured to extend along the radial direction of the cylinder.

[0015] Optionally, the second surface is further provided with a plurality of pits recessed along the thickness direction of the lining substrate.

[0016] A ball mill, comprising:

[0017] An abrasive cylinder comprises a cylinder body, a first end cover arranged at one end of the cylinder body and a second end cover arranged at the other end of the cylinder body; and

[0018] The magnetic lining as described in any of the above items can be provided in the cylinder, the first end cover and the second end cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of a partial structure of an abrasive cylinder shown in an exemplary embodiment of the present application;

[0020] Figure 2 is a schematic diagram of a magnetic liner shown in an exemplary embodiment of the present application;

[0021] Figure 3 yes Figure 2 A schematic diagram of a second surface of the liner substrate shown in FIG.

[0022] Figure 4 It is a schematic diagram of the magnetic lining of the cylinder;

[0023] Figure 5 is a schematic diagram of the magnetic liner of the end cap;

[0024] Figure 6 is a schematic diagram of a second surface of a lining substrate of a cylinder magnetic lining;

[0025] Figure 7Schematic diagram of the second surface of the liner substrate of the end cap magnetic liner. DETAILED DESCRIPTION

[0026] Here, exemplary embodiments will be described in detail, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are only examples of devices and methods consistent with some aspects of the present application.

[0027] The terms used in this application are only for the purpose of describing specific embodiments, and are not intended to limit this application. Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The "first", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "one" or "one" do not indicate quantity restrictions, but indicate that there is at least one, and will be separately described if only "one" is referred to. "Multiple" or "several" means two or more. Unless otherwise specified, similar words such as "front", "rear", "lower" and / or "upper", "top", "bottom" are only for the convenience of explanation, and are not limited to one position or one spatial orientation. Similar words such as "include" or "comprise" mean that the elements or objects appearing in front of "include" or "comprise" cover the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. The words "connected" or "connected" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0028] Please refer to Figure 1 , Figure 1 It is a schematic diagram of a partial structure of a ball mill abrasive barrel 100.

[0029] The present application provides a ball mill, which includes an abrasive barrel 100, which includes a barrel 10, a first end cover and a second end cover ( Figure 1 100). The barrel 10 is a cylindrical barrel. The first end cap is connected to one end of the barrel 10, and the second end cap is connected to the other end of the barrel 10. The material and the grinding medium are placed in the abrasive barrel 100. When the abrasive barrel 100 rotates, the material and the grinding medium collide with each other in the abrasive barrel 100, thereby grinding the material.

[0030] In order to extend the service life of the abrasive barrel 100, the ball mill further includes a magnetic liner 20 disposed in the abrasive barrel 100, and the magnetic liner 20 can be adsorbed or disposed on the inner surface of the abrasive barrel 100. More specifically, the magnetic liner 20 can be disposed or adsorbed on the inner surfaces of the barrel 10, the first end cover, and the second end cover. The magnetic liner 20 can adsorb the magnetic substances in the material and the smaller particles formed after the grinding medium is worn to itself, so that a protective layer can be formed on the magnetic liner 20, so that the abrasive barrel 100 can be protected, the wear of the material and the grinding medium on the abrasive barrel 100 can be reduced, and the service life of the magnetic liner 20 can be extended.

[0031] Please refer to Figure 2 and Figure 3 , Figure 2 It is a schematic diagram of a magnetic liner 20 exemplarily shown in the present application. Figure 3 for Figure 2 Schematic diagram of the second surface 211 of the liner substrate 21 is shown in FIG.

[0032] The magnetic lining 20 includes a lining substrate 21 and a plurality of permanent magnetic sheets 22 arranged on the lining substrate 21. The lining substrate 21 includes a first surface 210 and a second surface 211 in the thickness direction. The plurality of permanent magnetic sheets 22 are arranged in multiple rows and fixed on the first surface 210. For example, the plurality of permanent magnetic sheets 22 can be fixed on the first surface 210 by adhesive bonding, but it is not limited thereto. The second surface 211 is used to face the material in the abrasive barrel 100, and the second surface 211 is configured as an adsorption surface that can adsorb magnetic substances. The second surface 211 is also provided with an anti-detachment structure 2110 for limiting the adsorbed object from detaching from the second surface 211. For example, the lining substrate 21 is configured as a magnetic conductive material made of metal, and the second surface 211 can form a magnetic adsorption surface that can adsorb magnetic substances under the action of the magnetic field of the plurality of permanent magnetic sheets 22, and the second surface 211 itself is magnetic. Alternatively, the magnetic backing plate 20 is made of a non-magnetic material, and the adsorbed object is adsorbed on the second surface 211 under the attraction of the plurality of permanent magnetic sheets 22 , and the second surface 211 itself is non-magnetic.

[0033] In this solution, the adsorbed object, such as the magnetic substance of the material or the grinding medium of the magnetic conductive material, can be adsorbed on the second surface 211 by the magnetic force of the permanent magnetic sheet 22, so that a protective layer can be formed on the second surface 211, thereby reducing the wear of the magnetic liner 20 when grinding the material, thereby extending the service life of the magnetic liner 20 and the service life of the abrasive barrel 100. In addition, the anti-detachment structure 2110 can also limit the adsorbed object from detaching from the second surface 211, so that the adsorbed object can be more reliably and stably adsorbed on the second surface 211.

[0034] It should be noted that multiple magnetic lining plates 20 can be arranged on the inner surface of the cylinder 10, and multiple magnetic lining plates 20 can be spliced ​​to cover the entire inner surface of the cylinder 10. In addition, multiple magnetic lining plates 20 can also be arranged on the inner surfaces of the first end cover and the second end cover to cover the entire inner surfaces of the first end cover and the second end cover.

[0035] In an optional embodiment, a permanent magnetic sheet 22 with a magnetic field strength of 1500 Gauss can be used to adsorb small grinding media such as steel balls and magnetic materials on the second surface 211 to form a protective layer. When the protective layer reaches a certain thickness, there is no direct impact and abrasion between the lining substrate 21 and the moving grinding media and materials, thereby reducing the wear rate of the lining substrate 21 and extending the service life of the lining substrate 21. The protective layer is always in a dynamic balance of wear and replenishment, thereby protecting the magnetic lining 20.

[0036] In one embodiment, Figure 3 As shown, the anti-detachment structure 2110 includes a plurality of pits arranged on the second surface 211. The plurality of pits can form a receiving space on the second surface 211, so that at least part of the adsorbed object is located in the receiving space, and the distance between the adsorbed object and the plurality of permanent magnetic sheets 22 is closer, so that the magnetic field force is greater and the adsorption effect is better.

[0037] In one embodiment, a plurality of grooves 212 may be provided on the first surface 210, and each permanent magnetic sheet 22 may be provided in each groove 212 in a one-to-one correspondence. In this way, the position of each permanent magnetic sheet 22 may be limited by the groove 212, thereby ensuring the stability of the position of each permanent magnetic sheet 22. In addition, it is convenient to fill the groove 212 with adhesive to ensure the reliability of each permanent magnetic sheet 22 being bonded to the lining substrate 21. For example, SGA-39 all-purpose adhesive may be used, which has an adhesiveness ten times higher than that of ordinary all-purpose adhesive, is acid and alkali resistant, waterproof and corrosion resistant, and can effectively bond the permanent magnetic sheet 22 to the lining substrate 21 made of metal.

[0038] In one embodiment, Figure 2 As shown, the plurality of permanent magnetic sheets 22 are arranged into at least a first row 23 and a second row 24, the first row 23 is adjacent to the second row 24, a first gap 220 is left between adjacent permanent magnetic sheets 22 in the first row 23, a second gap 221 is left between adjacent permanent magnetic sheets 22 in the second row 24, and the first gap 220 and the second gap 221 are staggered. In this solution, the first gap 220 and the second gap 221 are staggered, so that the magnetic force distribution of each permanent magnetic sheet 22 in two adjacent rows is more uniform, which is conducive to more uniform adsorption of magnetic materials on the second surface 211. Figure 3In the illustrated embodiment, the number of permanent magnet pieces 22 in the first row 23 is greater than the number of permanent magnet pieces 22 in the second row 24 , and the area of ​​a single permanent magnet piece 22 in the first row 23 is smaller than the area of ​​a single permanent magnet piece 22 in the second row 24 .

[0039] Please refer to Figure 4 and Figure 5 , Figure 4 It is a schematic diagram of the cylinder magnetic liner 201. Figure 5 Schematic diagram of the end cover magnetic liner 202.

[0040] In one embodiment, the magnetic lining 20 includes a cylindrical magnetic lining 201 disposed on the cylindrical body 10, and the permanent magnetic sheets 22 on the cylindrical magnetic lining 201 are arranged in multiple rows and distributed along a straight line. With such an arrangement, the method of fixing the permanent magnetic sheets 22 to the lining substrate 21 is simpler and more convenient. Figure 4 In the illustrated embodiment, the lining substrate 21 of the cylindrical magnetic lining 201 is square, and each permanent magnetic sheet 22 is also square, so that the permanent magnetic sheets 22 can cover the entire area of ​​the lining substrate 21 .

[0041] exist Figure 4 In the illustrated embodiment, the permanent magnetic sheets 22 in any two adjacent rows are in facing positions, and gaps are left between adjacent permanent magnetic sheets 22 in the same row, and the gaps in any two adjacent rows are in facing positions.

[0042] In order to facilitate installation, multiple cylinder magnetic lining plates 201 can be provided, and multiple cylinder magnetic lining plates 201 are spliced ​​to cover the entire inner surface of the cylinder 10. The shapes of the multiple cylinder magnetic lining plates 201 can be the same or different.

[0043] Please refer to Figure 6 , Figure 6 Schematic diagram of the second surface 211 of the liner substrate of the cylindrical magnetic liner 201.

[0044] In one embodiment, Figure 6 As shown, the anti-separation structure 2110 includes a first convex rib provided on the second surface 211 of the cylinder magnetic liner 201 and protruding along the thickness direction of the liner substrate 21, and the first convex rib is arranged to extend along the axial direction of the cylinder 10. In this way, when the cylinder 10 rotates, the magnetic material adsorbed on the second surface 211 can be blocked by the first convex rib, reducing the risk of separation from the cylinder magnetic liner 201 under centrifugal force. A plurality of first convex ribs can be provided, and the plurality of first convex ribs all extend along the axial direction of the cylinder 10 and are distributed at intervals.

[0045] In one embodiment, Figure 2As shown, the magnetic lining plate 20 also includes an end cover magnetic lining plate 202 provided on the end cover of the abrasive cylinder of the ball mill, and the permanent magnetic pieces 22 on the end cover magnetic lining plate 202 are arranged in multiple rows and distributed along an arc. Among them, the end cover magnetic lining plate 202 can be provided with multiple pieces, each end cover magnetic lining plate 202 is trapezoidal, and multiple end cover magnetic lining plates 202 are arranged to be spliced ​​around the axis of the cylinder 10 to cover the first end cover or the second end cover.

[0046] exist Figure 2 In the illustrated embodiment, the permanent magnetic sheets 22 on the end cover magnetic lining plate 202 are arranged in multiple rows from the center of the end cover outward, and the number of permanent magnetic sheets 22 in the row farthest from the center of the end cover is greater than the number of permanent magnetic sheets 22 in the remaining rows. Due to centrifugal force, the farther from the center of the first end cover, the greater the kinetic energy of the material and the grinding medium, the greater the number of permanent magnetic sheets 22, the greater the magnetic field force, the better the adsorption effect, and the smaller the wear of the end cover magnetic lining plate 202.

[0047] Please refer to Figure 7 , Figure 7 FIG. 2 is a schematic diagram of a second surface 211 of a liner substrate of an end cap magnetic liner 202 .

[0048] In one embodiment, Figure 7 As shown, the anti-separation structure 2110 includes a second convex rib provided on the second surface 211 of the end cover magnetic liner 202 and protruding along the thickness direction of the liner substrate 21, and the second convex rib is arranged to extend along the radial direction of the cylinder 10. In this way, when the cylinder 10 rotates, the magnetic material adsorbed on the second surface 211 can be blocked by the second convex rib, reducing the risk of separation from the cylinder magnetic liner 201 under centrifugal force. A plurality of second convex ribs can be provided, and the plurality of second convex ribs all extend along the radial direction of the cylinder 10 and are distributed at intervals.

[0049] The magnetic liner 20 provided in the present application can be used in a φ3260 two-stage grinding ball mill, with an average service life of 6 years, which is about 4 times that of a traditional manganese steel liner. The average weight of a magnetic liner 20 is about 20-25 kg, which greatly reduces the frequency and difficulty of disassembly and assembly of the magnetic liner 20, while reducing the labor intensity of workers and making it safer. Among them, the weight of a complete set of magnetic liner 20 is about 20 tons, which is about 40% of the weight of a traditional manganese steel liner, reducing the power consumption cost by 20%.

[0050] The magnetic liner 20 provided in the present application, the liner substrate 21 can be cast and formed by scrap steel, scraps, high manganese iron rough embryos and molybdenum alloy. The liner substrate 21 is mainly made of non-magnetic metal cast by steel, manganese and molybdenum, and has the characteristics of wear resistance, strong magnetic permeability, and no obstruction to the magnetic field. After the liner substrate 21 is cast and formed, add an appropriate amount of SGA-39 universal glue into the groove 212, and put the permanent magnetic sheet 22 of the compliant size into the groove 212, ensuring that the upper surface of the permanent magnetic sheet 22 is flush with the surface of the liner substrate 21, and cannot protrude or be concave, so as to ensure that the permanent magnetic sheet 22 and the inner surface of the abrasive tube 100 have sufficient contact surface, and then fill the gap around the permanent magnetic sheet 22 and the groove 212 with SGA-39 universal glue to ensure that the two are fully adhered and not easy to fall off.

[0051] The abrasive cylinder 100 can be used in a compatible manner, and the original bolt holes on the abrasive cylinder 100 can be plugged with special wooden plugs. The end cover magnetic liner 202 can be composed of multiple fan-shaped liner plates of different sizes. After splicing, a small gap will be generated between two adjacent liner plates. Manual prying will be performed until all gaps are basically balanced between 5mm-10mm, and then the wheel will be turned until the broken steel balls and magnetic materials are adsorbed on the second surface. The cylinder magnetic liner 201 can all adopt a rectangular structure of 160mm*290mm*60, which are arranged and installed on the inner wall of the cylinder 10 in sequence. After splicing, a small gap will be generated between two adjacent liner plates. Manual prying will be performed until all gaps are basically balanced between 5mm-10mm, and then the wheel will be turned until the broken steel balls and magnetic materials are adsorbed on the second surface.

[0052] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A magnetic liner for a ball mill, characterized in that: include: A liner substrate including a first surface and a second surface in a thickness direction; and A plurality of permanent magnetic sheets are arranged in multiple rows and fixed on the first surface, the second surface is arranged as an adsorption surface capable of adsorbing magnetic material, and the second surface is also provided with an anti-detachment structure for limiting the adsorbed object from detaching from the second surface.

2. The magnetic lining according to claim 1, characterized in that: The plurality of permanent magnetic sheets are arranged into at least a first row and a second row, the first row is adjacent to the second row, a first gap is left between adjacent permanent magnetic sheets in the first row, a second gap is left between adjacent permanent magnetic sheets in the second row, and the first gap is staggered with the second gap.

3. The magnetic liner according to claim 1, characterized in that: The first surface is provided with a plurality of grooves, and each permanent magnetic sheet is arranged in each groove in a one-to-one correspondence.

4. The magnetic liner according to claim 1, characterized in that: The magnetic lining plate comprises a cylinder magnetic lining plate used for being arranged on the cylinder body of the abrasive cylinder, and the permanent magnetic sheets on the cylinder magnetic lining plate are arranged in multiple rows and distributed along a straight line.

5. The magnetic lining plate according to claim 4, characterized in that: The anti-separation structure includes a first rib which is provided on the second surface of the cylindrical magnetic lining and protrudes along the thickness direction of the lining substrate, and the first rib is arranged to extend along the axial direction of the cylindrical body.

6. The magnetic liner according to claim 1, characterized in that: The magnetic lining plate also includes an end cover magnetic lining plate arranged on the end cover of the abrasive cylinder of the ball mill, and the permanent magnetic sheets on the end cover magnetic lining plate are arranged in multiple rows and in an arc shape.

7. The magnetic liner according to claim 6, characterized in that: The permanent magnetic sheets on the magnetic lining plate of the end cover are arranged in multiple rows from the center of the end cover outwards, and the number of permanent magnetic sheets in the row farthest from the center of the end cover is greater than the number of permanent magnetic sheets in the remaining rows.

8. The magnetic liner according to claim 6, characterized in that: The anti-separation structure includes a second convex rib provided on the second surface of the end cover magnetic lining plate and protruding along the thickness direction of the lining plate substrate, and the second convex rib is arranged to extend along the radial direction of the cylinder.

9. The magnetic backing plate according to any one of claims 1 to 8, characterized in that: The second surface is also provided with a plurality of recessed pits along the thickness direction of the lining plate substrate.

10. A ball mill, characterized in that: include: An abrasive cylinder comprises a cylinder body, a first end cover arranged at one end of the cylinder body and a second end cover arranged at the other end of the cylinder body; as well as According to any one of claims 1 to 9, the magnetic lining may be provided in the cylinder, the first end cover and the second end cover.

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