Ball mill liner structure

Abstract

The utility model discloses a ball mill lining plate structure relates to mineral processing technical field, aims at solving the problem of traditional lining plate quick wearing, resource waste, uneven grinding product. It includes ball mill shell, shell inner wall spreads axial lining plate and end cover lining plate, axial lining plate is radially in the shape of a wave, and the ceramic lining strip is arranged on the crest, and ceramic lining strip thickness increases along the discharge port to the feed port, and end cover lining plate is spliced into by sector lining plate piece and ceramic lining plate, and the classification lining plate with screen hole is installed in the shell near the export end. The structure can prolong the service life of lining plate, improve material utilization, also can improve grinding efficiency and product pass rate, simplify maintenance, is applicable to the mineral processing grinding scene.

Description

Technical Field

[0001] This utility model relates to the field of mineral processing technology, specifically to a ball mill liner structure. Background Technology

[0002] In the mineral processing production process, the ball mill is a key grinding equipment, and the performance of its liners directly affects grinding efficiency, equipment lifespan, and production costs. However, several problems still exist in practical applications: First, as protective components of the ball mill end caps, the liners endure the impact and friction of grinding media and materials for extended periods, resulting in rapid wear, short replacement cycles, and high costs. Second, traditional axial liners have uniform thickness, but during the grinding process, the material particle size at the feed inlet is larger, and the impact and friction of the grinding media are stronger, causing the liner wear rate to be much faster than at the discharge outlet. This leads to premature failure of the feed inlet liner, while the discharge outlet liner still has considerable usable space, resulting in wasted liner resources. Third, during the grinding process, some coarse-grained materials are easily discharged along with fine-grained materials, resulting in uneven particle size of the grinding product, requiring secondary grinding, which increases production energy consumption and costs. Utility Model Content

[0003] The purpose of this invention is to provide a ball mill liner structure to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a ball mill liner structure, including a ball mill shell, the inner wall of the ball mill shell is covered with axial liners and end cover liners, the axial liners are laid in other positions except for the ball mill end covers, the axial liners form a wave shape in the radial direction of the ball mill shell, the crests of the waves are replaceable ceramic liner strips, and the thickness of the ceramic liner strips increases sequentially from the discharge port to the feed port of the ball mill shell.

[0005] Preferably, the axial liner consists of a left liner unit and a right liner unit arranged symmetrically. Ceramic strips are installed on the near ends of the left and right liner units, and the top of the ceramic strips is higher than other positions of the liner units.

[0006] Preferably, the end cap liner is composed of a fan-shaped liner plate and a ceramic liner plate. The fan-shaped liner plate is fixed to the end of the ball mill housing, and the ceramic liner plate is fixed to the side wall of the fan-shaped liner plate and covers it.

[0007] Preferably, the ball mill housing, the left liner unit, the right liner unit, and the sector-shaped liner plate are all provided with mounting holes, and the left liner unit, the right liner unit, and the sector-shaped liner plate are fixed to the ball mill housing by bolts inserted into the mounting holes.

[0008] Preferably, the ceramic liner strip is bonded and fixed to the left liner unit and the right liner unit with high-strength adhesive, and the ceramic liner plate is also bonded to the fan-shaped liner plate with high-strength adhesive.

[0009] Preferably, a grading liner is installed inside the ball mill shell near the outlet end. The grading liner divides the inner cavity of the ball mill shell into two parts. The grading liner is composed of multiple sector units spliced ​​together. The sector units are provided with uniformly arranged screen holes for screening materials.

[0010] Preferably, the thickness difference between two axially adjacent ceramic strips is 1-2 mm.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] 1. Improve wear resistance, extend service life and reduce costs

[0013] High-hardness ceramic components (ceramic strips and ceramic liners) are used in key wear-prone areas (axial liner crests and end cap liner sidewalls), resulting in a higher wear resistance coefficient compared to traditional cast iron liners. The ceramic strips increase in thickness along the "outlet → inlet" direction (with a difference of 1-2 mm between adjacent strips), adapting to the high-wear conditions at the inlet. This extends the overall lifespan of the liners, increases the replacement cycle, and reduces procurement and labor costs.

[0014] 2. Improve the utilization rate of lining plates and avoid waste.

[0015] To solve the problems of "early failure at the feed inlet and redundancy at the discharge outlet" in traditional uniform thickness liners, the gradient thickness design ensures that the wear rate of each part of the liner is consistent, enabling synchronous replacement and improving material utilization.

[0016] 3. Simplify maintenance and improve equipment uptime.

[0017] The ceramic parts are replaceable independently. If there is local wear, only the ceramic parts need to be replaced. There is no need to remove the entire liner plate. This shortens the maintenance time per operation, reduces downtime for maintenance, and improves equipment uptime.

[0018] 4. Add screening to improve grinding precision.

[0019] Fine-grained materials enter the outlet through the sieve holes of the grading liner 3, while coarse-grained materials are intercepted and returned to the "grinding zone" for further grinding, ensuring that the grinding product has a uniform particle size, eliminating the need for secondary grinding, and reducing production energy consumption. Attached Figure Description

[0020] Figure 1 This is a diagram of the internal structure of a ball mill.

[0021] Figure 2 This is a schematic diagram of the axial liner structure;

[0022] Figure 3 This is a schematic diagram showing the wear location of the axial liner.

[0023] Figure 4 This is a schematic diagram of the end cap liner assembly.

[0024] Figure 5 This is a schematic diagram of the end cap liner.

[0025] Figure 6 This is a schematic diagram of the assembly of the left liner unit and ceramic liner strip along the axial direction of the ball mill casing.

[0026] In the figure: 1. Ball mill housing; 2. Axial liner; 21. Right liner unit; 22. Left liner unit; 23. Mounting hole; 24. Ceramic liner strip; 3. Grading liner; 4. End cover liner; 41. Fan-shaped liner plate; 42. Ceramic liner. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] The ball mill liner structure in this embodiment is designed with the core objectives of "improving wear resistance, optimizing grinding efficiency, and reducing maintenance costs". It consists of a ball mill shell 1, axial liners 2, stagers 3, and end cover liners 4. The installation and assembly methods of each component are as follows:

[0029] 1. Foundation preparation for the ball mill casing

[0030] The ball mill housing 1 serves as the mounting base for all liners. It must first be ensured that its inner wall surface is free of burrs, rust, or protruding impurities (this can be achieved by sanding or high-pressure air blowing) to avoid gaps during subsequent liner installation. Simultaneously, the positions and dimensions of the pre-set mounting holes on the inner wall of the ball mill housing 1 must be checked to ensure they match the mounting holes 23 of the axial liner 2 and the end cover liner 4, ensuring the stability of the bolt connections (refer to...). Figure 1 (This refers to the internal structure after overall assembly).

[0031] 2. Installation and assembly of axial liners

[0032] The axial liner 2 is used to cover the entire inner wall of the ball mill housing 1 except for the end caps. Its core features are a "radial wave-like structure" and "gradient thickness ceramic liner strips". The specific installation steps are as follows:

[0033] Liner unit installation and fixing: The axial liner 2 consists of a left liner unit 22 and a right liner unit 21 arranged symmetrically (reference). Figure 2 , Figure 6During installation, first symmetrically attach the left liner unit 22 and the right liner unit 21 to the inner wall so that the two end to the side of the liner unit forms a wavy "crest" position; then pass the bolt through the mounting hole 23 on the liner unit and screw it into the corresponding preset screw hole in the ball mill housing 1, control the bolt tightening force to ensure that there is no loose gap between the liner unit and the housing 1.

[0034] Ceramic strip bonding and positioning: At the "crests" formed by the left and right liner units, use high-strength epoxy adhesive (shear strength ≥15MPa) to bond the replaceable ceramic strip 24 (reference). Figure 6 Before bonding, the bonding surface of the liner unit and the bottom surface of the ceramic liner 24 need to be degreased (wiped with alcohol). The adhesive thickness should be controlled at 0.5-1mm. After bonding, fix with clamps for 24 hours until the adhesive layer is completely cured. After curing, ensure that the top of the ceramic liner 24 is 2-3mm higher than other parts of the liner unit to preferentially withstand the impact and friction of the grinding media and materials (e.g., Figure 3 As shown, the crest section of the axial liner 2 experiences the greatest wear, therefore this position is designated for a replaceable ceramic liner 24.

[0035] Thickness gradient control: The thickness of the ceramic liner 24 needs to increase sequentially along the direction of "ball mill shell 1 discharge port → feed port", and the thickness difference between two adjacent ceramic liners 24 in the axial direction should be strictly controlled within 1-2mm (for example, the thickness of the ceramic liner at the discharge port is 8mm, and the thickness of each adjacent liner towards the feed port is 9mm, 10mm, etc.) to adapt to the working conditions of "large material particle size and strong impact friction" at the feed port, avoid premature failure of the feed port liner, and realize dynamic adjustment of the grinding space to prevent the ore from accumulating together.

[0036] 3. Installation and splicing of end cap liners

[0037] End cover liner 4 is used to protect the ball mill end cover. It adopts a composite structure of "metal substrate + ceramic cover". The specific installation steps are as follows (refer to...). Figure 4 , Figure 5 ):

[0038] Fixing the fan-shaped liner plates: The base of the end cover liner plate 4 is a fan-shaped liner plate 41. According to the diameter of the ball mill end cover, select the corresponding number of fan-shaped liner plates 41 to ensure that there are no gaps after splicing. Attach each fan-shaped liner plate 41 to the inner wall of the end cover and fix it to the pre-set screw holes of the end cover by bolts passing through its mounting holes 23.

[0039] Ceramic liner bonding: On the side wall of the fan-shaped liner plate 41 (i.e. the surface that directly contacts the grinding media and materials), the ceramic liner plate 42 is bonded with the same high-strength epoxy adhesive as the ceramic liner strip 24 to ensure that the ceramic liner plate 42 completely covers the side wall of the fan-shaped liner plate 41 with no exposed areas; after bonding, the flatness of the ceramic liner plate 42 needs to be checked, and the error should not exceed 0.5mm to prevent the grinding media from getting stuck or materials from accumulating.

[0040] 4. Installation and commissioning of grading liner plates

[0041] The classifying liner 3 is used to screen grinding products and prevent coarse particles from being discharged with fine particles. The specific installation steps are as follows (refer to the instructions). Figure 1 ):

[0042] Installation Positioning: Install the grading liner 3 inside the ball mill housing 1 near the outlet end, ensuring that it fits tightly against the inner wall of the housing 1, and divide the inner cavity of the ball mill housing 1 into a "grinding zone" (near the feed inlet side) and a "screening zone" (near the outlet side).

[0043] Sector-shaped unit splicing: The grading liner 3 is composed of multiple sector-shaped units spliced ​​together. The sector-shaped units are equipped with evenly arranged screen holes (the hole diameter is set according to the grinding requirements). After installation, the screen holes need to be checked with a gauge to avoid clogging.

[0044] 5. Working process and performance characteristics

[0045] The working process and advantages of the ball mill liner structure in this embodiment during actual operation are as follows:

[0046] Material grinding process: The material enters the "grinding zone" from the feed inlet of the ball mill. Because the ceramic liner 24 at the feed inlet is thicker and more wear-resistant, it can withstand the severe impact and friction between large-sized materials and the grinding media. As the ball mill rotates, the material moves towards the discharge outlet, and the thickness of the ceramic liner 24 gradually decreases to meet the friction requirements after the material particle size is reduced, thus avoiding waste of liner resources.

[0047] Grading and screening effect: When the material enters the "screening zone", the fine particles pass through the screen holes of the grading liner 3 and are discharged through the outlet, while the coarse particles are intercepted and returned to the "grinding zone" for further grinding, ensuring that the grinding product has a uniform particle size, eliminating the need for secondary grinding and reducing production energy consumption.

[0048] Convenience of maintenance: When the ceramic liner 24 or ceramic liner 42 wears beyond the limit, the old liner / liner can be removed directly, the bonding surface can be cleaned and the new part can be re-bonded, without replacing the entire axial liner 2 or end cover liner 4, which greatly shortens the maintenance time and reduces the maintenance cost.

[0049] In summary, this embodiment, through its structural design of "wavy axial liner + gradient ceramic liner + composite end cap liner + graded liner", effectively solves the problems of "rapid wear, resource waste, and uneven product particle size" of traditional liners, and significantly improves the grinding efficiency and service life of the ball mill.

[0050] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A ball mill liner structure, comprising a ball mill shell (1), the inner wall of the ball mill shell (1) being fully covered with axial liners (2) and end cap liners (4), the axial liners (2) being laid in all positions except for the ball mill end caps, characterized in that: The axial liner (2) forms a wave shape in the radial direction of the ball mill housing (1), with a replaceable ceramic liner (24) at the crest. The thickness of the ceramic liner (24) increases sequentially from the outlet to the inlet of the ball mill housing (1).

2. The ball mill liner structure according to claim 1, characterized in that: The axial liner (2) consists of a left liner unit (22) and a right liner unit (21) arranged symmetrically. Ceramic strips (24) are installed at the close ends of the left liner unit (22) and the right liner unit (21), and the top of the ceramic strips (24) is higher than other positions of the liner unit.

3. The ball mill liner structure according to claim 2, characterized in that: The end cap liner (4) is made of a fan-shaped liner plate (41) and a ceramic liner plate (42). The fan-shaped liner plate (41) is fixed to the end of the ball mill housing (1), and the ceramic liner plate (42) is fixed to the side wall of the fan-shaped liner plate (41) and covers it.

4. The ball mill liner structure according to claim 3, characterized in that: Mounting holes (23) are provided on the ball mill housing (1), left liner unit (22), right liner unit (21) and fan-shaped liner plate (41). The left liner unit (22), right liner unit (21) and fan-shaped liner plate (41) are fixed to the ball mill housing (1) by inserting bolts into the mounting holes (23).

5. The ball mill liner structure according to claim 3, characterized in that: The ceramic liner (24) is bonded and fixed to the left liner unit (22) and the right liner unit (21) with high-strength adhesive. The ceramic liner (42) and the fan-shaped liner (41) are also bonded with high-strength adhesive.

6. The ball mill liner structure according to claim 1, characterized in that: A grading liner (3) is installed inside the ball mill housing (1) near the outlet end. The grading liner (3) divides the inner cavity of the ball mill housing (1) into two parts. The grading liner (3) is composed of multiple fan-shaped units spliced ​​together. The fan-shaped units are provided with uniformly arranged screen holes for screening materials.

7. The ball mill liner structure according to claim 1, characterized in that: The thickness difference between two axially adjacent ceramic strips (24) is 1-2 mm.

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