Center disc lining plate of efficient quality-improving lattice type ball mill and using method of center disc lining plate

Abstract

The invention discloses a center disc lining plate of an efficient quality-improving lattice type ball mill and a using method of the center disc lining plate, and the center disc lining plate of the efficient quality-improving lattice type ball mill is provided with an inner ring ball mill lattice plate, lattice plate screw holes, lattice plate pressing plates, lattice plate flow guide holes and lattice plate extension part pressing blocks, a grid plate cover plate is cast in front of the inner-ring ball mill grid plate, and a grid plate pressing plate is cast on the back of the inner-ring ball mill grid plate; a grid plate fixing flat head bolt is assembled on the edge of one side of the grid plate cover plate, so that the grid plate cover plate is matched and connected with the grid plate pressing plate; a grid plate screw hole is formed in the edge of one side of the grid plate pressing plate and used for installation of the center disc grid lining plate. On the basis of keeping the structural form of the discharging end cover of the existing grid type ball mill, the grid plate and the central lining plate are optimally designed, and the discharging area of the grid plate is enlarged, so that the service life of the base is prolonged, and the discharging efficiency of the ball mill is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of ball mills, in particular to a central disc lining plate of a high-efficiency quality-improving grid-type ball mill and a use method thereof. Background Art

[0002] Grate ball mill is a key equipment for crushing and grinding materials after they are broken. It is widely used in cement, silicate products, new building materials, refractory materials, fertilizers, ferrous and non-ferrous metal beneficiation, glass and ceramics and other production industries.

[0003] The grate type ball mill is equipped with a main bearing seat, a discharging hopper and a discharging screen in the end cover with a hollow shaft neck at the discharging end. The normal discharging end cover is composed of a center liner, a grate liner and a dustpan-shaped liner. Several radial ribs are cast on the inner wall of the end cover, which divides the end cover into several fan-shaped chambers. A dustpan-shaped liner is installed in each fan-shaped chamber and fixed to the end cover with screws, and then the grate plate is installed on each fan-shaped chamber formed by the dustpan liner. There are two structural forms of the grate liner: one is a group of two pieces, which are pressed by a wedge iron, and the wedge iron is screwed through the ribs to the end cover, and the center part is supported by the center liner stop to prevent them from tilting and falling off; the other is to combine the two pieces into one piece and fix them directly with screws. The center liner is star-shaped, which consists of two pieces and is fixed to the ribs with screws.

[0004] The material enters the cylinder through the feeding part of the grid-type ball mill, and the inside is filled with grinding media of a certain shape and size. When the ball mill rotates, the grinding body adheres to the lining surface of the inner wall of the cylinder under the action of centrifugal force and the friction generated by the lining surface of the inner wall of the cylinder, rotates with the cylinder, and is brought to a certain height. Under the action of gravity, it falls freely. When falling, the grinding body hits the material at the bottom like a projectile and crushes the material. The rise and fall of the grinding body is a repetitive cycle. In addition, during the rotation of the ball mill, the media in the body will also slide and roll, so friction occurs between the grinding body, lining and material, so that the material can be ground.

[0005] When materials are continuously fed in, the difference in material surface between the feed and discharge ends can force the materials to flow, and the axial thrust generated by the impact of the grinding body when it falls also forces the materials to flow. At the same time, the air flow movement in the ball mill will also help the materials to flow until they reach the grate plate and pass through the discharge guide holes on the upper part of the grate plate to be discharged to the ball mill discharge screen.

[0006] The existing patent with publication number CN209697070U discloses a ball mill grid lining. The body comprises an outer ring lattice lining plate and an inner ring lattice lining plate. The outer ring lattice lining plate is composed of a plurality of lattice lining plates overlapped and pressed together to form an annular lining plate group. The inner ring lattice lining plate is composed of a plurality of lattice lining plates overlapped and pressed together to form a circular lining plate. The inner and outer circles of the outer ring lattice lining plate group and the inner ring lattice lining plate group are concentric. The outer ring lattice lining plate group and the inner ring lattice lining plate group are arranged in the ball mill. The outer ring lattice lining plate and the inner ring lattice lining plate are both fan-shaped. The inner surface of one side of the fan-shaped outer ring lattice lining plate and the inner ring lattice lining plate is provided with a boss, a bolt hole is provided on the boss, and a first groove is provided on the outer surface. The bolt hole penetrating the outer ring lattice lining plate and the inner ring lattice lining plate is provided on the boss. The inner surface of the other side is provided with a second groove, and a U-shaped groove is provided on the second groove. Adjacent outer ring lattice lining plates or inner ring lattice lining plates are mutually pressed and installed by countersunk bolts in the circumferential direction. The problem of difficult disassembly and assembly between lattice lining plates is solved.

[0007] Although this invention solves some problems, what this patent aims to solve is the problem that traditional grating linings and center disc linings are difficult to disassemble and assemble, and are easy to fall off during use; there are no sieve holes at the center disc position, which cannot improve the discharge efficiency, and the thickness of the grating plate is concave, dividing the original center disc lining into several triangles.

[0008] Therefore, the applicant, based on many years of rich experience in design, development and actual production in the relevant industry, has conducted research and improvements on the existing structure and deficiencies, and provided a center disc liner for a high-efficiency and high-quality grate ball mill and a method of using the same, in order to achieve a more practical purpose. Summary of the invention

[0009] 1. Technical issues to be resolved

[0010] In view of the deficiencies in the prior art, the present invention provides a center disk liner of a high-efficiency quality-improving grid-type ball mill and a method for using the same, which solves the problem in the prior art that the accompanying materials are constantly ground in the cylinder of the ball mill and the steel balls make a falling motion in the cylinder, which always causes impact on the center liner of the discharge end cover of the ball mill. Conventional center liner plates are always fixed with screws or wedges. When the service life of the liner plate is more than half, the center liner plate will fall off, resulting in serious ball leakage in the ball mill. The problem that the center liner of the discharge end of the existing ball mill has a short service life and low discharge efficiency is solved.

[0011] (II) Technical solution

[0012] To achieve the above objectives, the present invention is implemented through the following technical solutions: a central disc liner of a high-efficiency quality-improving grate-type ball mill, comprising an inner ring ball mill grate plate, a grate plate screw hole, a grate plate pressure plate, a grate plate guide hole and a grate plate extension block, wherein a grate plate cover plate is cast on the front of the inner ring ball mill grate plate, and a grate plate pressure plate is cast on the back thereof;

[0013] One side edge of the grating cover is equipped with a grating plate fixing flat head bolt to achieve a matching connection with the grating plate pressure plate; one side edge of the grating plate pressure plate is equipped with a grating plate screw hole for installing the center plate grating lining plate; the sizes of the grating plate screw hole and the grating plate fixing flat head bolt match each other; the grating plate fixing flat head bolt passes through the grating plate screw hole, so that the grating plate pressure plate and the grating cover are closely matched;

[0014] The inner ring ball mill grate plate is fixed to the discharge end cover of the grate type ball mill through the grate plate fixing flat head bolts;

[0015] The lower end of the inner ring ball mill grate plate is provided with a grate plate extension part, which is located at the center plate of the grate type ball mill, thereby expanding the discharge area of ​​the grate plate;

[0016] The grate plate guide holes are regularly distributed on the inner ring ball mill grate plate and the grate plate extension to speed up the discharge rate;

[0017] The grating plate extension part pressing block is assembled in the gap between the grating plate pressing plate and the grating plate cover plate when the grating plate pressing plate and the grating plate cover plate are assembled.

[0018] Preferably, the grid plate extension block is covered with rubber on one side, and a block back rubber sponge pad is mounted on the back of the block. The block back rubber sponge pad is located at the end of the liner and is in direct contact with the ball mill cylinder and the end cover.

[0019] Preferably, the inner ring ball mill grate plate is fan-shaped and is made of a wear-resistant layer or wear-resistant metal cast as a whole to ensure that it is smooth as a whole and has no gaps; it is fixed to the discharge end cover of the grate type ball mill by fixing flat head bolts on the grate plate, and this structure is conducive to the discharge of the material after grinding.

[0020] Preferably, the screw hole of the grating plate is an assembly hole with one end not closed, and its function is to realize the mutual installation between the grating plates of the inner ring ball mill and the connection with the discharge end cover.

[0021] Preferably, the grating plate fixing flat head bolt is customized according to the bolt hole size and the reserved size of the grating plate pressure plate, and is integrally processed from 35CrMo material. The top is an elliptical countersunk shape, and the front end of the bolt is designed to be a smooth cylinder according to the length of the end cover, while the rear end is equipped with a thread of appropriate nominal diameter. Through the cooperation of the steel bowl sealing ring and the bolt, the bolt can be firmly fixed to the outside of the discharge end cover of the ball mill.

[0022] Preferably, the grating extension is customized according to the size of the inner circle ball mill grating and the original center liner, and the original fan-shaped structure is changed into an circumscribed circular triangle structure, which is cast integrally with the inner circle ball mill grating; it is cast integrally with wear-resistant and impact-resistant materials.

[0023] Preferably, the grating plate pressure plate and the grating plate cover plate are tightly matched, and the overall thickness after matching is consistent with the thickness of the inner ring ball mill grating plate, and the installation gap between the grating plates is 5-15mm.

[0024] Preferably, the grating plate extension block is made of wear-resistant rubber material and is arranged at the bottom end of one side of the grating plate pressure plate during the installation of the center plate grating lining plate to reduce the gap of the original center plate lining plate and enhance its wear-resistant structure.

[0025] Preferably, the rubber sponge pad on the back of the pressing block is made of wear-resistant rubber material. During the overall installation process, it is arranged on the contact side with the ball mill cylinder and the inside of the end cover. The sponge pad is used for contact with the cylinder to reduce the scouring of the cylinder by the slurry through the adsorption of the sponge. A layer of rubber is added between the liner and the sponge pad to avoid excessive wear between the ball mill liner and the ball mill cylinder.

[0026] A method for using a central disc liner of a high-efficiency quality-improving grid-type ball mill includes a central disc liner of a high-efficiency quality-improving grid-type ball mill, specifically comprising the following steps:

[0027] S1: During assembly, the inner ring ball mill grating is first cast in one piece, a grating cover is cast on the front of the inner ring ball mill grating, and a grating pressure plate is cast on the back; a grating fixing flat head bolt is installed on one side edge of the grating cover, and a grating screw hole is installed on one side edge of the grating pressure plate;

[0028] S2: The flat head bolts fixing the grating plate are passed through the screw holes of the grating plate, so that the grating plate pressure plate and the grating plate cover plate are closely matched, and the center plate grating lining plate is assembled and installed.

[0029] S3: When the grid plate extension block is assembled with the grid plate pressure plate and the grid plate cover plate, during the installation of the center plate grid lining plate, it is arranged at the bottom end of one side of the grid plate pressure plate to reduce the gap of the original center plate lining plate; the back of the grid plate extension block is equipped with a rubber sponge pad on the back of the block, which is located at the end of the lining plate and directly contacts the ball mill cylinder and the end cover;

[0030] S4: the slurry product after the hydrocyclone sand settling enters the grate ball mill cylinder, and the cylinder is filled with rubber sponge pads (i.e., rubber sponge pads 55 on the back of the briquette);

[0031] S5: Under the crushing of the grinding media in the ball mill cylinder, the fine-particle slurry product gradually flows to the discharge liner position with the rotation of the cylinder and the height difference of the liquid level, first flowing through the outer ring grate plate and then flowing through the inner ring ball mill grate plate and the extension of the ball mill grate plate;

[0032] S6: The regular distribution plate guide holes on the inner ring ball mill grid plate and the grid plate extension can also block some large particles from returning to the cylinder for further grinding, and also speed up the discharge rate;

[0033] S7: When grinding in a closed-circuit system, a short mill or a medium-long mill is usually combined with a grading device to form a closed-circuit system because a coarser fineness is required.

[0034] (III) Beneficial effects

[0035] The present invention provides a central disc lining plate of a high-efficiency quality-improving grid-type ball mill and a method for using the same. It has the following beneficial effects:

[0036] This invention optimizes the design of the grate plate and the center liner while maintaining the existing grate-type ball mill discharge end cover structure. By expanding the discharge area of ​​the grate plate, the discharge efficiency of the ball mill is effectively improved. At the same time, it is more convenient for daily fastening and maintenance. The one-piece casting design method and the application of the grate plate extension block combination greatly extend the service life of the center disk. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the structure of the center plate liner of the grid type ball mill;

[0038] Figure 2 Side view of the structure for installing the center plate liner of the grate type ball mill;

[0039] Figure 3 This is the installation structure diagram of the center plate liner of the grid type ball mill;

[0040] Figure 4 It is a three-dimensional image of the center plate grid lining;

[0041] In the figure: 1. Inner ring ball mill grating plate, 2. grating plate screw hole, 3. grating plate pressure plate, 4. grating plate guide hole, 5. grating plate extension block,

[0042] 11. Grating extension, 22. Grating fixing flat head bolts, 33. Grating cover, 55. Rubber sponge pad on the back of the pressure block. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] See also Figure 1-4 The present invention provides a technical solution: a central plate lining of a high-efficiency quality-improving grid-type ball mill, comprising an inner ring ball mill grid plate 1, grid plate screw holes 2, a grid plate pressure plate 3, a grid plate guide hole 4 and a grid plate extension block 5, wherein a grid plate cover plate 33 is cast on the front of the inner ring ball mill grid plate 1, and a grid plate pressure plate 3 is cast on the back thereof;

[0045] One side edge of the grating cover plate 33 is equipped with a grating plate fixing flat head bolt 22 to achieve a matching connection with the grating plate pressure plate 3; one side edge of the grating plate pressure plate 3 is equipped with a grating plate screw hole 2 for installing the center plate grating lining plate; the size of the grating plate screw hole 2 and the grating plate fixing flat head bolt 22 match each other; the grating plate fixing flat head bolt 22 passes through the grating plate screw hole 2, so that the grating plate pressure plate 3 and the grating cover plate 33 are closely matched;

[0046] The inner ring ball mill grate plate 1 is fixed to the discharge end cover of the grate type ball mill through the grate plate fixing flat head bolts 22;

[0047] The lower end of the inner ring ball mill grate plate 1 is provided with a grate plate extension 11, which is located at the center plate of the grate type ball mill, and expands the discharge area of ​​the grate plate;

[0048] The grate plate guide holes 4 are regularly distributed on the inner ring ball mill grate plate 1 and the grate plate extension 11 to speed up the discharge rate;

[0049] When the grating plate extension block 5 is assembled with the grating plate pressing plate 3 and the grating plate cover plate 33 , it is assembled in the gap between them.

[0050] The grid plate extension block 5 is covered with rubber on one side, and a block back rubber sponge pad 55 is mounted on the back of the block. The block back rubber sponge pad 55 is located at the end of the liner and directly contacts the ball mill cylinder and the end cover.

[0051] The inner ring ball mill grate plate 1 is fan-shaped and is cast integrally with a wear-resistant layer or wear-resistant metal to ensure that it is smooth as a whole and has no gaps. It is fixed to the discharge end cover of the grate type ball mill by grate plate fixing flat head bolts 22. This structure is conducive to the discharge of the ground material.

[0052] The screw hole 2 of the grating plate is an assembly hole with one end not closed, and its function is to realize the mutual installation between the grating plates 1 of the inner circle ball mill and the connection with the discharge end cover.

[0053] The grating plate fixing flat head bolt 22 is customized according to the bolt hole size and the reserved size of the grating plate pressure plate 3. It is made of 35CrMo material as a whole. The top is an elliptical countersunk shape. The front end of the bolt is designed to be a smooth cylinder according to the length of the end cover, and the rear end is equipped with a thread of appropriate nominal diameter. Through the cooperation of the steel bowl sealing ring and the bolt, the bolt can be firmly fixed on the outside of the discharge end cover of the ball mill.

[0054] The grating extension 11 is customized according to the size of the inner circle ball mill grating 1 and the original center liner, and the original fan-shaped structure is changed into an circumscribed triangular structure, and is cast integrally with the inner circle ball mill grating 1; it is cast integrally with wear-resistant and impact-resistant materials.

[0055] The grating plate pressure plate 3 is tightly matched with the grating plate cover plate 33. After matching, the overall thickness is consistent with the thickness of the inner ring ball mill grating plate 1, and the installation gap between the grating plates is 5-15mm.

[0056] The grid plate extension block 5 is made of wear-resistant rubber material. During the installation of the center plate grid lining, it is arranged at the bottom end of one side of the grid plate pressure plate 3 to reduce the gap of the original center plate lining and enhance its wear-resistant structure.

[0057] The rubber sponge pad 55 on the back of the pressing block is made of wear-resistant rubber material. During the overall installation process, it is arranged on the contact side with the ball mill cylinder and the inside of the end cover. The sponge pad is used for contact with the cylinder to reduce the scouring of the cylinder by the slurry through the adsorption of the sponge. A layer of rubber is added between the liner and the sponge pad to avoid excessive wear between the ball mill liner and the ball mill cylinder.

[0058] A method for using a center plate liner of a high-efficiency quality-improving grid-type ball mill includes a center plate liner of a high-efficiency quality-improving grid-type ball mill, specifically comprising the following steps:

[0059] S1: During assembly, the inner ring ball mill grate plate 1 is first cast in one piece, a grate plate cover plate 33 is cast on the front, and a grate plate pressure plate 3 is cast on the back; a grate plate fixing flat head bolt 22 is mounted on one side edge of the grate plate cover plate 33, and a grate plate screw hole 2 is mounted on one side edge of the grate plate pressure plate 3;

[0060] S2: Fix the flat head bolt 22 through the screw hole 2 of the grating plate, so that the grating plate 3 and the grating plate cover 33 are closely matched, and the center plate grating lining is assembled and installed.

[0061] S3: When the grid plate extension block 5 is assembled with the grid plate pressure plate 3 and the grid plate cover plate 33, during the installation of the center plate grid lining plate, it is arranged at the bottom end of one side of the grid plate pressure plate 3 to reduce the gap of the original center plate lining plate; the back of the grid plate extension block 5 is equipped with a block back rubber sponge pad 55, which is located at the end of the lining plate and directly contacts the ball mill cylinder and the end cover;

[0062] S4: The slurry product after the grit settling in the hydrocyclone enters the cylinder of the grate ball mill, and the cylinder is filled with rubber sponge pads, i.e., rubber sponge pads 55 on the back of the briquette;

[0063] S5: Under the crushing of the grinding medium of the ball mill cylinder, the fine-particle slurry product gradually flows to the discharge liner position with the rotation of the cylinder and the height difference of the liquid level, first flows through the outer ring grid plate and then flows through the inner ring ball mill grid plate 1 and the ball mill grid plate extension 11;

[0064] S6: The distribution plate guide holes 4 are arranged regularly on the inner ring ball mill grid plate 1 and the grid plate extension 11, which can also block part of the large particles from returning to the cylinder for further grinding, and also speed up the discharge rate;

[0065] S7: When grinding in a closed-circuit system, a short mill or a medium-long mill is usually combined with a grading device to form a closed-circuit system because a coarser fineness is required.

[0066] Embodiment 1: During operation, the slurry product after sand settling in the hydrocyclone enters the grate ball mill cylinder. The cylinder is filled with rubber sponge pads (rubber sponge pads 55 on the back of the pressing block) to protect the mill cylinder and end cover. Under the crushing of the grinding medium of the ball mill cylinder, the fine-particle slurry product gradually flows to the discharge lining position along with the rotation of the cylinder and the height difference of the liquid level. It first flows through the outer ring grate plate and then flows through the inner ring ball mill grate plate 1 and the grate plate extension 11 of the ball mill. The center disk liner obtained by this combination can improve the forced discharge efficiency of the ball mill, and the ore turnover in the cylinder is fast, and the over-grinding is light, which is beneficial to improving the capacity of the mill. At the same time, the grate plate guide holes 4 can also block some large particles from returning to the cylinder for further grinding. When grinding in a closed-circuit system, since a coarser fineness is required out of the mill, a short mill or a medium-long mill is usually combined with a grading device into a closed-circuit system. This structure can not only improve the mill discharge efficiency, but also facilitate daily fastening and maintenance. At the same time, the combined application of the one-piece casting design method and the rubber pressure block 5 on the side of the grate plate extension greatly extends the service life of the center disk.

[0067] In summary, on the basis of maintaining the existing grate-type ball mill discharge end cover structure, the grate plate and the center liner are optimized and designed. By expanding the discharge area of ​​the grate plate, the discharge efficiency of the ball mill is effectively improved. At the same time, it is more convenient for daily fastening and maintenance. The one-piece casting design method and the application of the grate plate extension block combination greatly extend the service life of the center plate.

[0068] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0069] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A central plate lining of a high-efficiency quality-improving grid-type ball mill, comprising an inner ring ball mill grid plate (1), grid plate screw holes (2), a grid plate pressure plate (3), a grid plate guide hole (4) and a grid plate extension block (5), characterized in that: The inner ring ball mill grate plate (1) is cast with a grate plate cover plate (33) on the front side, and a grate plate pressure plate (3) on the back side; One side edge of the grating cover plate (33) is equipped with a grating plate fixing flat head bolt (22) to achieve a matching connection with the grating plate pressure plate (3); one side edge of the grating plate pressure plate (3) is equipped with a grating plate screw hole (2) for installing the center plate grating lining plate; the size of the grating plate screw hole (2) and the grating plate fixing flat head bolt (22) match each other; the grating plate fixing flat head bolt (22) passes through the grating plate screw hole (2) so that the grating plate pressure plate (3) and the grating cover plate (33) are tightly matched; The inner ring ball mill grate plate (1) is fixed to the discharge end cover of the grate type ball mill through the grate plate fixing flat head bolts (22); The lower end of the inner ring ball mill grate plate (1) is provided with a grate plate extension part (11), which is located at the center plate of the grate type ball mill, thereby expanding the discharge area of ​​the grate plate; The grid plate guide holes (4) are regularly distributed on the inner ring ball mill grid plate (1) and the grid plate extension (11), thereby accelerating the discharge rate; The lattice plate extension block (5) is assembled with the lattice plate pressure plate (3) and the lattice plate cover plate (33) and is installed in the gap between them.

2. The central disc lining plate of a high-efficiency quality-improving grid-type ball mill according to claim 1 is characterized in that: The grid plate extension block (5) is a rubber-covered block on one side, and a block back rubber sponge pad (55) is mounted on the back of the block. The block back rubber sponge pad (55) is located at the end of the liner and is in direct contact with the ball mill cylinder and the end cover.

3. The central disc lining plate of a high-efficiency quality-improving grid-type ball mill according to claim 1 is characterized in that: The inner ring ball mill grate plate (1) is fan-shaped and is made of a wear-resistant layer or a wear-resistant metal by integral casting to ensure that it is smooth and has no gaps. It is fixed to the discharge end cover of the grate type ball mill by grate plate fixing flat head bolts (22). This structure is conducive to the discharge of the ground material.

4. The central disc lining plate of a high-efficiency quality-improving grid-type ball mill according to claim 1 is characterized in that: The grid plate screw hole (2) is an assembly hole with one end not closed, and its function is to realize the mutual installation between the inner ring ball mill grid plates (1) and the connection with the discharge end cover.

5. The central disc lining plate of a high-efficiency quality-improving grid-type ball mill according to claim 1 is characterized in that: The grating plate fixing flat head bolt (22) is customized according to the bolt hole size and the reserved size of the grating plate pressure plate (3), and is made of 35CrMo material as a whole. The top is an elliptical countersunk shape. The front end of the bolt is designed to be a smooth cylindrical shape according to the length of the end cover, and the rear end is equipped with a thread of an appropriate nominal diameter. Through the cooperation of the steel bowl sealing ring and the bolt, the bolt can be firmly fixed on the outside of the discharge end cover of the ball mill.

6. The central disc lining plate of a high-efficiency quality-improving grid-type ball mill according to claim 1 is characterized in that: The grating extension (11) is customized according to the size of the inner ring ball mill grating (1) and the original center liner, and the original fan-shaped structure is changed into an circumscribed circular triangle structure, and is integrally cast with the inner ring ball mill grating (1); it is integrally cast using wear-resistant and impact-resistant materials.

7. The central disc lining plate of a high-efficiency quality-improving grid-type ball mill according to claim 1 is characterized by: The grating plate pressure plate (3) and the grating plate cover plate (33) are tightly matched. After matching, the overall thickness is consistent with the thickness of the inner ring ball mill grating plate (1). The installation gap between the grating plates is 5-15mm.

8. The central disc lining plate of a high-efficiency quality-improving grid-type ball mill according to claim 1 is characterized in that: The grid plate extension block (5) is made of wear-resistant rubber material and is arranged at the bottom end of one side of the grid plate pressure plate (3) during the installation of the center plate grid lining plate, thereby reducing the gap of the original center plate lining plate and enhancing its wear-resistant structure.

9. The central disc lining plate of a high-efficiency quality-improving grid-type ball mill according to claim 1, characterized in that: The rubber sponge pad (55) on the back of the pressing block is made of wear-resistant rubber material. During the overall installation process, it is arranged on the side in contact with the ball mill cylinder and the inside of the end cover. The sponge pad is used to contact the cylinder to reduce the scouring of the cylinder by the slurry through the adsorption of the sponge. A layer of rubber is added between the liner and the sponge pad to avoid excessive wear between the ball mill liner and the ball mill cylinder.

10. A method for using the center plate liner of a high-efficiency quality-improving grid-type ball mill, characterized in that: The central disc liner of the high-efficiency quality-improving grid-type ball mill according to claim 1 specifically comprises the following steps: S1: During assembly, the inner ring ball mill grate plate (1) is first cast into an integral shape, with a grate plate cover plate (33) cast on the front and a grate plate pressure plate (3) cast on the back; a grate plate fixing flat head bolt (22) is mounted on one side edge of the grate plate cover plate (33), and a grate plate screw hole (2) is mounted on one side edge of the grate plate pressure plate (3); S2: The flat head bolts (22) for fixing the grating plate are passed through the screw holes (2) of the grating plate, so that the grating plate pressure plate (3) and the grating plate cover plate (33) are tightly matched, and the center plate grating lining plate is assembled and installed. S3: When the grid plate extension block (5) is assembled with the grid plate pressure plate (3) and the grid plate cover plate (33), during the installation of the center plate grid lining plate, it is arranged at the bottom end of one side of the grid plate pressure plate (3) to reduce the gap of the original center plate lining plate; the back of the grid plate extension block (5) is equipped with a block back rubber sponge pad (55), which is located at the end of the lining plate and directly contacts the ball mill cylinder and the end cover; S4: the slurry product after the hydrocyclone sand settling enters the grate ball mill cylinder, and the cylinder is filled with rubber sponge pads (i.e., rubber sponge pads 55 on the back of the briquette); S5: Under the crushing of the grinding media in the ball mill cylinder, the fine-particle slurry product gradually flows to the discharge liner position along with the rotation of the cylinder and the height difference of the liquid level, first flows through the outer ring grate plate and then flows through the inner ring ball mill grate plate (1) and the ball mill grate plate extension (11); S6: The distribution plate guide holes (4) are arranged regularly on the inner ring ball mill grid plate (1) and the grid plate extension (11), which can also block part of the large particles from returning to the cylinder for further grinding, and also speed up the discharge rate; S7: When grinding in a closed-circuit system, a short mill or a medium-long mill is usually combined with a grading device to form a closed-circuit system because a coarser fineness is required.

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