Grinding disc, horizontal mill

Abstract

The invention provides a grinding disc for a horizontal mill, wherein the grinding disc is a three-layer sandwich structure, wherein the sandwich layer is a first manganese steel layer, and both sides of the sandwich layer are first composite layers, and a side of the first composite layer close to the sandwich layer is a first permanent magnetic layer, and a side of the first composite layer away from the sandwich layer is a first rubber layer, and the surface field strength of the first rubber layer is 10-30 mT; four arc-shaped stirring blades are arranged on both sides of the grinding disc; the stirring blade is a three-layer sandwich structure, wherein the sandwich layer of the stirring blade is a second manganese steel layer, and both sides of the second manganese steel layer are second composite layers; a side of the second composite layer close to the second manganese steel layer is a second permanent magnetic layer, and a side of the second composite layer away from the second manganese steel layer is a second rubber layer, and the surface field strength of the second rubber layer is 10-30 mT, and a lower field strength can form a magnetite layer, thereby protecting the grinding disc and the stirring blade, and extending the service life of the horizontal mill.

Description

Technical Field

[0001] The present invention relates to the technical field of ore grinding, and more specifically, to a grinding disc and a horizontal grinding machine for ore grinding. Background Art

[0002] At present, my country's metallurgy, mining, ceramics and other industries have set up grinding industries, the purpose of which is to grind large pieces of materials into finer pieces. Especially in mining enterprises, almost every beneficiation plant has a grinding process. Grinding equipment has also been widely studied due to practical problems such as large investment, high power consumption and large wear.

[0003] Currently, the embedded particle size of many ores, especially non-ferrous ores, reaches 5-15 microns. When performing the grinding process, traditional horizontal grinding equipment such as ball mills drives the liner to rotate through the rotation of the outer cylinder to lift the medium and material to achieve the grinding effect. However, such traditional grinding equipment such as ball mills have high energy consumption when used for fine grinding, and when the embedded particle size of the mineral is below 15 microns, the traditional mill is restricted by its equipment structure and the influence of the grinding medium and cannot achieve the monomer dissociation of the target mineral, which results in many ultra-fine embedded minerals cannot be effectively utilized.

[0004] Based on the above problems, when fine grinding minerals, horizontal mills are currently used, in which the cylinder does not rotate but the parts inside the cylinder rotate at high speed. However, in the existing horizontal mills, the high-speed rotating parts are in direct contact with the ore and the grinding medium. The rotating parts are easily worn and have a short lifespan, which greatly affects the operating efficiency of the mill.

[0005] Therefore, there is an urgent need for a grinding disc for a horizontal mill that is not easy to wear and can improve the efficiency of grinding operations. Summary of the invention

[0006] In view of the above problems, the object of the present invention is to provide a grinding disc, and in particular to provide a grinding disc for a horizontal mill, so as to solve the problem that in the existing horizontal mill, high-speed rotating parts are in direct contact with the ore and the grinding medium, the rotating parts are easily worn and have a short life, which greatly affects the operating efficiency of the horizontal mill.

[0007] The present invention provides a grinding disc for a horizontal grinding machine, characterized in that:

[0008] The grinding disc is a three-layer sandwich structure, wherein the sandwich layer of the grinding disc is a first manganese steel layer, and both sides of the sandwich layer are first composite layers;

[0009] The side of the first composite layer close to the sandwich layer is a first permanent magnetic layer, the side of the first composite layer away from the sandwich layer is a first rubber layer, and the surface field strength of the first rubber layer is 10-30mT;

[0010] Four arc-shaped stirring blades are evenly arranged on both sides of the grinding disc; among them,

[0011] The stirring blade is a three-layer sandwich structure, where the sandwich layer of the stirring blade is the second manganese steel layer, and both sides of the second manganese steel layer are the second composite layers;

[0012] One side of the second composite layer close to the second manganese steel layer is the second permanent magnetic layer, and the side of the second composite layer away from the second manganese steel layer is the second rubber layer, and the surface field strength of the second rubber layer is 10 - 30 mT.

[0013] Preferably, the diameter of the grinding disc is 1.5 - 2.5 m;

[0014] 4 - 6 flow holes are evenly arranged on the grinding disc.

[0015] Preferably, the stirring blade is a C-shaped arc blade.

[0016] In addition, the present invention also provides a horizontal mill, including a rotating central shaft, characterized in that,

[0017] 6 - 10 grinding discs are serially arranged on the rotating central shaft.

[0018] Preferably, the interval between the grinding discs is 600 - 800 mm.

[0019] Preferably, the peripheral linear velocity of the grinding disc is 20 - 25 m / s.

[0020] Preferably, 4 - 6 flow holes are evenly arranged on the grinding disc, and the length from the center of the circle of the flow hole to the center of the rotating central shaft is 1 / 2 - 2 / 3 of the radius of the grinding disc.

[0021] Preferably, it further includes a cylinder body arranged between the rotating central shaft and the outer periphery of the grinding disc, where,

[0022] The gap width between the cylinder body and the edge of the grinding disc is 10 - 20 mm.

[0023] Preferably, a feed box and a discharge pipe are respectively arranged at both ends of the cylinder body.

[0024] Preferably, it further includes a driving device for providing driving force for the grinding disc,

[0025] The driving motor of the driving device is a frequency conversion motor.

[0026] As can be seen from the above description, the grinding disc provided by the present invention has a three-layer sandwich structure. The sandwich layer of the grinding disc is the first manganese steel layer, and the outer layers on both sides of the grinding disc are the first composite layers. The inner side of the first composite layer is the first permanent magnet layer, and the outer layer of the first composite layer is the first rubber layer. Moreover, the surface magnetic field strength of the first rubber layer is 10 - 30 mT. At the same time, four equally angled stirring blades are evenly arranged on both sides of the grinding disc, and the stirring blades also have a three-layer sandwich structure similar to that of the grinding disc. The first permanent magnet layer and the second permanent magnet layer in the grinding disc and the stirring blades are made of magnetic materials, and the magnetic field strength on the surfaces of the first and second rubber layers is 10 - 30 mT. The relatively low magnetic field strength can adsorb a small amount of magnetite on the surfaces of the grinding disc and the stirring blades, thereby forming a magnetite layer with a thickness of 10 - 30 mm. The formation of the magnetite layer enables the horizontal mill equipped with this grinding disc to achieve friction between mineral materials, thereby protecting the grinding disc and the stirring blades, and greatly extending the service life of the high-speed rotating grinding disc and the stirring blades. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] By referring to the following description in conjunction with the accompanying drawings and the content of the claims, and with a more comprehensive understanding of the present invention, other objects and results of the present invention will become more apparent and easier to understand. In the drawings:

[0028] Figure 1 is a top view of the surface of the grinding disc according to an embodiment of the present invention;

[0029] Figure 2 is a schematic cross-sectional view of the grinding disc according to an embodiment of the present invention;

[0030] Figure 3 is a schematic cross-sectional view of a horizontal mill according to an embodiment of the present invention;

[0031] The reference numerals therein include: 1, cylinder body; 2, driving device; 3, rotating central shaft; 4, grinding disc; 5, overflow hole; 6, first manganese steel layer; 7, first permanent magnet layer; 8, first rubber layer; 9, stirring blade; 10, feed box; 11, discharge pipe; 12, second manganese steel layer; 13, second permanent magnet layer; 14, second rubber layer.

[0032] In all the drawings, the same reference numerals indicate similar or corresponding features or functions. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] When grinding equipment such as a ball mill is performing the grinding process, the rotation of the outer shell cylinder drives the rotation of the lining plate to lift the medium and materials to achieve the grinding effect. However, the cylinder of traditional grinding equipment has a critical speed, resulting in many minerals with ultra-fine particle dissemination not being effectively utilized. Therefore, when finely grinding minerals currently, a horizontal mill with a non-rotating cylinder and high-speed rotation of the components inside the cylinder is adopted. However, in the existing horizontal mill, the components with high-speed rotation directly contact the ore and grinding medium, and the rotating components are easily worn and have a short service life, greatly affecting the operation efficiency of the mill.

[0034] In view of the above problems, the present invention provides a grinding disc. The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0035] To illustrate the grinding disc provided by the present invention, Figure 1 and Figure 2 exemplarily mark the structure of the grinding disc from different perspectives. Specifically, Figure 1 shows a top view of the disc surface of the grinding disc according to an embodiment of the present invention; Figure 2 shows a schematic cross-sectional view of the grinding disc according to an embodiment of the present invention.

[0036] The following description of the exemplary embodiments is actually only illustrative and in no way limits the present invention and its application or use. Technologies and devices known to those of ordinary skill in the relevant field may not be discussed in detail, but where appropriate, the technologies and devices should be regarded as part of the specification.

[0037] In Figure 1 the illustrated embodiment, the grinding disc 4 provided by the present invention is in a round cake shape, the diameter of the grinding disc 4 is 1.5 - 2.5 m, and 4 - 6 flow holes 5 are uniformly arranged on the grinding disc 4, and the mineral materials can flow sequentially through the flow holes 5.

[0038] In Figure 1 、 Figure 2In the illustrated embodiments, the grinding disc 4 has a three-layer sandwich structure. Among them, the sandwich layer of the grinding disc 4 is the first manganese steel layer, and both sides of the sandwich layer are the first composite layers formed by the composite of the first permanent magnet layer and the first rubber layer. Specifically, the inner side (i.e., the side close to the sandwich layer) of the first composite layer is the first permanent magnet layer 7, and the outer side (i.e., the side away from the sandwich layer) of the first composite layer is the first rubber layer 8. Moreover, the surface magnetic field strength of the first rubber layer 8 is 10 - 30 mT. The relatively low magnetic field strength of 10 - 30 mT can adsorb a small amount of magnetite on the surface of the grinding disc 4, thereby forming a magnetite layer with a thickness of 10 - 30 mm. The formation of the magnetite layer can achieve the friction between mineral materials and can form a protection for the disc body of the grinding disc 4, greatly extending the service life of the high-speed rotating grinding disc 4. And the first rubber layer 8 is made of wear-resistant material, and even after the magnetism of the first permanent magnet layer 7 fades, it still has strong wear-resistant function, thus further extending the service life and improving the operation efficiency of the horizontal mill equipped with the grinding disc 4.

[0039] In Figure 1 、 Figure 2 In the illustrated embodiments, four equally angled stirring blades 9 are uniformly arranged on both sides of the grinding disc 4 respectively. And in order to make the load-bearing on both sides of the grinding disc 4 balanced, the stirring blades 9 on both sides are arranged in mirror symmetry. The stirring blade 9 is an arc-shaped blade, and there is no limit to the specific shape of the arc-shaped blade. In order to facilitate the stirring of the stirring blade 9, in this embodiment, a C-shaped arc-shaped blade is adopted. The adjacent grinding discs 4 can form a grinding chamber. In the grinding chamber formed by the adjacent grinding discs 4, the stirring blade 9 stirs and lifts the grinding medium in the chamber, so as to combine with the rotation of the grinding disc 4 to make the grinding medium circulate in the chamber formed by the adjacent grinding discs 4, and then realize the grinding of the mineral material and the grinding medium under the agitation of the grinding medium.

[0040] In the present invention Figure 1 and Figure 2In the jointly shown embodiment, the stirring blade 9 is also a three-layer sandwich structure. Among them, the sandwich layer of the stirring blade 9 is the second manganese steel layer 12, and the two sides of the second manganese steel layer (the outer layers on both sides of the stirring blade 9) are the second composite layers. The inner side of the second composite layer (the side close to the second manganese steel layer) is the second permanent magnet layer 13, and the outer layer of the second composite layer (the side away from the second manganese steel layer) is the second rubber layer 14. Moreover, the surface magnetic field strength of the second rubber layer 14 is 10 - 30 mT. The three-layer sandwich structure of this stirring blade 9 is similar to the three-layer sandwich structure of the grinding disc 4, but there are differences in the shape and thickness of each layer. Similarly, the relatively low magnetic field strength of 10 - 30 mT can adsorb a small amount of magnetite on the surface of the stirring blade 9, thereby forming a magnetite layer with a thickness of 10 - 30 mm. The formation of the magnetite layer can achieve the friction between mineral materials and can form protection for the stirring blade 9, greatly extending the service life of the stirring blade 9 and improving the operation efficiency of the horizontal mill equipped with the grinding disc 4. And the second rubber layer 14 is made of wear-resistant material. Even after the magnetism of the second permanent magnet layer 13 fades, the second rubber layer 14 still has strong wear-resistant function, thus further extending the service life of the stirring blade 9 and improving the operation efficiency of the horizontal mill equipped with the grinding disc 4.

[0041] The present invention also provides a horizontal mill. To illustrate the horizontal mill provided by the present invention, Figure 3 an exemplary marking is made on the structure of the horizontal mill.

[0042] As Figure 3 shown, the horizontal mill provided by the present invention includes a rotating central shaft 3 and the grinding disc 4 as described above. The grinding discs 4 are serially arranged on the rotating central shaft 3. The grinding disc 4 is a three-layer sandwich structure as described above, and will not be elaborated here.

[0043] As Figure 3 shown, the horizontal mill provided by the present invention has 6 - 10 grinding discs 4 serially arranged on the rotating central shaft 3. In this embodiment, the linear velocity at the end of the grinding disc 4 is 20 - 25 m / s. Combining 6 - 10 grinding discs 4 creates conditions for the ultra-fine dissociation of minerals; the interval between adjacent grinding discs is 600 - 800 mm, that is, several chambers are formed by the 600 - 800 mm spacing between adjacent grinding discs. Combining with the rotation of the grinding discs, the medium in each chamber accelerates radially outward along the disc surface. Since the grinding media in two adjacent grinding discs 4 are at different positions on the disc surface of the grinding disc 4, their accelerations are different. Therefore, an internal circulation movement of the medium is formed in each chamber under the rotation of the grinding disc 4, and thus grinding is achieved under the agitation of the medium. This multi-chamber grinding method not only avoids the short circuit of grinding, but also greatly increases the contact probability between mineral materials and grinding media, increases the grinding probability of mineral materials, and creates favorable conditions for ultra-fine grinding.

[0044] As Figure 3As shown in the figure, the horizontal mill provided by the present invention is evenly provided with 4-6 overflow holes 5 on the grinding disc, and the overflow holes 5 gradually decrease in the direction from the feed box 10 to the discharge pipe 11. In the direction from the feed box 10 to the discharge pipe 11, the overflow holes 5 provided on the grinding disc 4 gradually decrease. Such sequentially decreasing overflow holes 5 can enable the mineral materials to pass through between different compartments in sequence, realizing the sequential grinding of the mineral materials from coarse to fine. In this embodiment, the length from the center of the circle of the overflow hole 5 to the center of the rotation center shaft 3 is 1 / 2-2 / 3 of the radius length of the grinding disc. The size of the overflow hole 5 is not specifically limited. In this embodiment, an overflow hole with a diameter of 50-100 mm is adopted.

[0045] As Figure 3 shown in the figure, the horizontal mill provided by the present invention includes a cylinder 1 arranged between the rotation center shaft 3 and the outer periphery of the grinding disc 4. The gap width between the cylinder 1 and the edge of the grinding disc 4 is 10-20 mm. A feed box 10 and a discharge pipe 11 are respectively arranged at both ends of the cylinder 1. The feed box 10 is used to put grinding media and mineral materials into the horizontal mill, and the discharge pipe 11 is used to discharge the ground mineral materials. The materials of the feed box 10 and the discharge pipe 11 are not limited. In this embodiment, a metal material is adopted.

[0046] As Figure 3 shown in the figure, the horizontal mill provided by the present invention further includes a driving device 2. In this horizontal mill, the driving device 2 only drives the rotation of the grinding disc 4, rather than driving the rotation of the entire cylinder of the mill like a traditional mill, thereby greatly reducing the driving load of the driving device 2 and reducing the energy consumption of the driving device 2. In this embodiment, the driving motor of the driving device 2 adopts a variable frequency motor, enabling the horizontal mill to adjust the rotation speed of the grinding disc 4 according to the change of the mineral materials, so as to realize the ultrafine grinding of the minerals.

[0047] In the present invention Figure 3 In the embodiment shown in the figure, the mineral materials put into the feed box 10 enter the first grinding disc 4. The grinding disc 4 rotates around the rotation center shaft under the drive of the driving device 2. The stirring blades 9 arranged on the grinding disc 4 stir and lift the grinding media in the chamber, so as to make the grinding media circulate in the chamber combined with the rotation of the grinding disc 4, and further realize the grinding of the mineral materials and the grinding media. The mineral materials ground to a certain extent enter the second grinding disc through the flow holes 5, and so on. When the mineral materials enter the last grinding disc 4, they are finally ground and discharged through the discharge pipe 11.

[0048] As can be seen from the above embodiments, the horizontal mill provided by the present invention forms several compartments by arranging 6-10 grinding discs provided by the present invention. Stirring blades and overflow holes are arranged on the grinding discs, so that the grinding medium circulates inside the compartments, thereby realizing the grinding between the mineral materials and the grinding medium under the agitation of the medium, and enabling the mineral materials to pass through different compartments in descending order, realizing the sequential grinding of minerals from coarse to fine. And the grinding disc in the horizontal mill is a three-layer sandwich structure. The sandwich layer of the grinding disc is the first manganese steel layer, the outer layers on both sides of the grinding disc are the first composite layers, the inner side of the first composite layer is the first permanent magnet layer, and the outer layer of the first composite layer is the first rubber layer. Moreover, the surface magnetic field strength of the first rubber layer is 10-30 mT. At the same time, four equally angled stirring blades are evenly arranged on both sides of the grinding disc, and the stirring blades are also a three-layer sandwich structure similar to the grinding disc. The first permanent magnet layer and the second permanent magnet layer in the grinding disc and the stirring blades are made of magnetic materials, and the magnetic field strength on the surfaces of the first and second rubber layers is 10-30 mT. The lower magnetic field strength can adsorb a small amount of magnetite on the surfaces of the grinding disc and the stirring blades, thereby forming a magnetite layer with a thickness of 10-30 mm. The formation of the magnetite layer realizes the friction between the mineral materials, thereby protecting the grinding disc and the stirring blades, and greatly prolonging the service life of the high-speed rotating grinding disc and the stirring blades.

[0049] As described above, the grinding disc and the horizontal mill according to the present invention are described by way of example with reference to the accompanying drawings. However, those skilled in the art should understand that various improvements can be made to the above-mentioned grinding disc and horizontal mill of the present invention without departing from the content of the present invention. Therefore, the protection scope of the present invention should be determined by the content of the appended claims.

Claims

1. A grinding disc for a horizontal mill, characterized in that, the grinding disc has a three-layer sandwich structure, wherein the sandwich layer of the grinding disc is a first manganese steel layer, and both sides of the sandwich layer are first composite layers; one side of the first composite layer close to the sandwich layer is a first permanent magnet layer, and the side of the first composite layer away from the sandwich layer is a first rubber layer, and the surface field strength of the first rubber layer is 10 - 30 mT; four arc-shaped stirring blades are evenly arranged on both sides of the grinding disc respectively; wherein, the stirring blade has a three-layer sandwich structure, wherein the sandwich layer of the stirring blade is a second manganese steel layer, and both sides of the second manganese steel layer are second composite layers; one side of the second composite layer close to the second manganese steel layer is a second permanent magnet layer, and the side of the second composite layer away from the second manganese steel layer is a second rubber layer, and the surface field strength of the second rubber layer is 10 - 30 mT.

2. The grinding disc according to claim 1, characterized in that, the diameter of the grinding disc is 1.5 - 2.5 m; 4 - 6 flow holes are evenly arranged on the grinding disc.

3. The grinding disc according to claim 1, characterized in that, the stirring blade is a C-shaped arc blade.

4. A horizontal mill, including a rotating central shaft, characterized in that, 6 - 10 grinding discs according to claim 1 are serially arranged on the rotating central shaft.

5. The horizontal mill according to claim 4, characterized in that, the interval between the grinding discs is 600 - 800 mm.

6. The horizontal mill according to claim 4, characterized in that, the peripheral linear velocity of the grinding disc is 20 - 25 m / s.

7. The horizontal mill according to claim 4, characterized in that, 4 - 6 flow holes are evenly arranged on the grinding disc, and the length from the center of the circle of the flow hole to the center of the rotating central shaft is 1 / 2 - 2 / 3 of the radius of the grinding disc.

8. The horizontal mill according to any one of claims 4 to 7, characterized in that, it further includes a cylinder body arranged between the rotating central shaft and the outer periphery of the grinding disc, wherein, the gap width between the cylinder body and the edge of the grinding disc is 10 - 20 mm.

9. The horizontal mill according to claim 8, characterized in that, a feed box and a discharge pipe are respectively arranged at both ends of the cylinder body.

10. The horizontal mill according to claim 8, characterized in that, it further includes a driving device for providing driving force for the grinding disc, the driving motor of the driving device is a frequency conversion motor.

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