A ball mill grinding device

Abstract

The utility model discloses a ball mill grinding device, including the cylinder, the compartment board is arranged in the cylinder, the compartment board divides the cylinder into first grinding storehouse, second grinding storehouse, the first grinding storehouse, the second grinding storehouse all are provided with grinding ball, a plurality of first lining board is arranged on the lateral wall of first grinding storehouse, and the first lining board includes a plurality of wedge lining board, and each wedge lining board is distributed on the circumference lateral wall of first grinding storehouse in ladder type in proper order, a plurality of second lining board is arranged on the lateral wall of second grinding storehouse, and the second lining board includes a plurality of flat plate lining board that sets up on the lateral wall of second grinding storehouse in the circumference. The utility model discloses through installing two kinds of lining board in the cylinder of ball mill, makes grinding ball can efficiently grind material, has reduced the energy consumption of ball mill, has reduced operating cost, has increased the grinding efficiency.

Description

Technical Field

[0001] This utility model relates to the field of grinding equipment technology, and in particular to a ball mill grinding device. Background Technology

[0002] Currently, traditional ball mill coarse grinding chamber liners mostly use a single waveform. When there is no material, the grinding balls only follow the mill in a regular, parabolic motion. When material is present, the material is in front, and the grinding balls are behind. The material slows down the circular motion of the grinding balls, causing it to accumulate on the liner surface. The grinding balls move with the material, meaning that 40% of the grinding balls cannot perform parabolic motion. This results in low grinding efficiency in the coarse grinding chamber and low utilization of the grinding media impact energy (approximately 15-20% loss). To improve the grinding ball's impact, the material layer thickness is reduced, and the mill speed is increased, leading to increased energy consumption. Furthermore, the fine grinding chamber liners lack sufficient material guidance, making it difficult for fine particles to fully contact the grinding media. The proportion of particles >45μm in the finished product exceeds 10%, resulting in high energy consumption, low grinding efficiency, and high operating costs for the ball mill. Utility Model Content

[0003] This invention provides a ball mill grinding device that solves the problem that the low wedge fit between the grinding chamber liner and the grinding balls in traditional ball mills easily leads to low grinding efficiency and high operating costs.

[0004] This utility model provides a ball mill grinding device, including a cylinder. A partition plate is provided inside the cylinder, dividing the cylinder into a first grinding chamber and a second grinding chamber. Grinding balls are provided in both the first and second grinding chambers. Multiple first liners are provided on the side wall of the first grinding chamber. Each first liner includes multiple wedge-shaped liners, which are arranged in a stepped manner on the circumferential side wall of the first grinding chamber. Multiple second liners are provided on the side wall of the second grinding chamber. Each second liner includes multiple flat plate liners arranged circumferentially on the side wall of the second grinding chamber.

[0005] In the above technical solution, each of the wedge-shaped liner plates is provided with a plurality of unblocking grooves on its surface, and the cross-sectional shape of each unblocking groove is an inverted trapezoid.

[0006] In the above technical solution, further, each of the flat plate liner plates has a groove on its surface, a wear-resistant plate is provided in the groove, a guide groove is provided on the wear-resistant plate, and a plurality of grinding teeth are spaced apart along the length direction at the bottom of the guide groove.

[0007] In the above technical solution, the first liner and the second liner are both fixedly connected to the inner wall of the cylinder by bolts.

[0008] In the above technical solution, the step height of each wedge-shaped liner plate is further reduced step by step along the rotation direction of the cylinder.

[0009] In the above technical solution, the diameter of the grinding balls disposed in the first grinding chamber is larger than the diameter of the grinding balls disposed in the second grinding chamber.

[0010] As can be seen from the above technical solutions, this utility model provides a ball mill grinding device. Compared with the prior art, the beneficial effects of this utility model are: This invention achieves a significant increase in ball mill grinding efficiency through a differentiated and synergistic design of a stepped wedge-shaped liner (with an anti-clogging trapezoidal groove) in the first chamber and a flat liner with replaceable wear-resistant plates and grinding tooth guide grooves in the second chamber. This is further enhanced by optimization of the stepped height direction and grinding media gradation. The coarse grinding chamber exhibits high impact crushing efficiency, while the fine grinding chamber demonstrates excellent grinding and dispersion, resulting in overall increased output and superior product fineness. The inverted trapezoidal unblocking groove design on the wedge-shaped liner greatly reduces the risk of clogging, ensuring continuous and stable equipment operation. The modular wear-resistant plate design in the second chamber facilitates replacement and reduces maintenance costs; the rational liner structure also reduces abnormal wear. The stepped height decreasing design and differentiated liner structure jointly optimize material movement trajectory and impact / grinding sequence, improving energy utilization. Bolted connections and modular design (wear-resistant plates) make liner installation, replacement, and maintenance more convenient and faster. Attached Figure Description

[0011] To more clearly illustrate the technical solution of this utility model, the drawings used in the implementation examples will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0012] Figure 1 This is a schematic diagram of the overall structure of a ball mill grinding device proposed in this utility model; Figure 2 This is a top view schematic diagram of the overall structure of a ball mill grinding device proposed in this utility model; Figure 3 Appendix to this utility model Figure 2 AA sectional view; Figure 4 This is a schematic diagram of the first liner installation structure of a ball mill grinding device proposed in this utility model; Figure 5 This is a three-dimensional structural diagram of a wedge-shaped liner plate for a ball mill grinding device proposed in this utility model; Figure 6 This is a schematic diagram of the second liner installation structure of a ball mill grinding device proposed in this utility model; Figure 7 This is a three-dimensional structural diagram of a flat plate liner for a ball mill grinding device proposed in this utility model; Figure 8 This is a schematic diagram of the installation structure of the flat plate liner of the ball mill grinding device proposed in this utility model.

[0013] In the picture: 1-Cylinder body; 11-First grinding chamber; 12-Second grinding chamber; 2-Partition plate; 4-First liner; 41-Wedge-shaped liner; 42-Dredging groove; 5-Second liner; 51-Flat liner; 52-Groove; 53-Wear-resistant plate; 54-Guide groove; 55-Grinding teeth. Detailed Implementation

[0014] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0015] Example 1: See Figure 1-8 A ball mill grinding device includes a cylinder 1, with a partition plate 2 inside the cylinder 1 dividing the cylinder 1 into a first grinding chamber 11 and a second grinding chamber 12. Grinding balls are provided in both the first grinding chamber 11 and the second grinding chamber 12. Multiple first liners 4 are provided on the side wall of the first grinding chamber 11. Each first liner 4 includes multiple wedge-shaped liners 41, which are arranged in a stepped manner on the circumferential side wall of the first grinding chamber 11. Multiple second liners 5 are provided on the side wall of the second grinding chamber 12. Each second liner 5 includes multiple flat plate liners 51 arranged circumferentially on the side wall of the second grinding chamber 12.

[0016] In this embodiment, a partition plate 2 is arranged along the axial direction inside the cylinder 1 to strictly divide the inner cavity of the cylinder 1 into two independent grinding chambers. The two ends of the cylinder 1 are connected to the inlet and outlet pipes through two conical end caps. The first grinding chamber 11, which is closer to the material inlet end, is mainly used for coarse grinding, and the second grinding chamber 12, which is closer to the material outlet end, is mainly used for fine grinding. Both grinding chambers are filled with grinding balls as grinding media.

[0017] The first grinding chamber 11 has multiple first liner plates 4 fixedly installed on its inner circumferential wall. Each first liner plate 4 is composed of multiple independent wedge-shaped liners 41. These wedge-shaped liners 41 are installed along the circumferential direction of the cylinder 1, forming a stepped structure. That is, the joint ends of adjacent wedge-shaped liners 41 have a height difference in the radial direction of the cylinder, forming a stepped profile.

[0018] Specifically, the second grinding chamber 12 has multiple second liners 5 fixedly installed on its inner circumferential wall. The second liners 5 are composed of multiple flat liners 51. These flat liners 51 are arranged circumferentially along the circumferential direction of the cylinder 1, and their basic shape is flat (as opposed to wedge).

[0019] Understandably, within the same mill cylinder, the first chamber, which undertakes coarse grinding, and the second chamber, which undertakes fine grinding, employ completely different types of liners based on their structural principles. The stepped wedge-shaped liners 4 and flat liners 5 meet the physical requirements of different grinding stages. The stepped wedge-shaped liners 4 arrange the wedge-shaped liners (which themselves have the function of lifting materials) in a stepped manner, creating a more complex movement path for the material and grinding media. The stepped wedge-shaped liners in the first chamber enhance lifting capacity and impact force. The wedge structure effectively grasps and lifts the material and grinding balls when the mill rotates. The stepped distribution ensures that the lifted material and grinding balls reach a certain height (see the rotation direction of the ball mill cylinder 1 for details). Figure 4 The material falls from the same height, which greatly increases the frequency and intensity of impact, collision, and shearing between the material and the grinding media, between the grinding media and each other, and between the material and the liner. This is particularly suitable for crushing large pieces of material and grinding coarse particles required in the coarse grinding stage. The stepped drop makes the material's trajectory more uniform and covers a wider area, reducing the possibility of material "short-circuiting" in the bin and improving grinding efficiency.

[0020] Specifically, the second chamber (flat liner) promotes grinding and dispersion. Compared to the high-impact design of the first chamber, the flat liner 51 provides a relatively smooth inner surface. This reduces excessive impact and is more conducive to the grinding and dispersion required in the fine grinding stage. The material and smaller grinding balls roll and slide on the relatively flat liner surface, increasing the time and contact area for mutual friction and compression, which helps to further grind the coarsely ground particles to a finer particle size, providing more stable liner conditions for the uniform grinding of fine particles.

[0021] In this embodiment, see Figure 4 , 5Each wedge-shaped liner 41 has multiple unclogging grooves 42 on its surface, and each unclogging groove 42 has an inverted trapezoidal cross-sectional shape. Multiple unclogging grooves 42 are formed on the working surface of each wedge-shaped liner 41 (i.e., the surface facing the mill center and in contact with the material and grinding media). The cross-sectional shape of each unclogging groove 42 is designed as an inverted trapezoid, meaning the groove opening (near the mill center) is wider, while the groove bottom (near the liner base) is narrower. This specific design of the unclogging groove 42 as an inverted trapezoid provides better anti-clogging performance. When fine particles enter the groove, due to the narrow bottom and wide opening, the material is difficult to form a stable accumulation and compaction at the bottom. The vibration generated during mill rotation, along with the movement of the material and grinding media, more easily "push" or "shake" the material entering the groove out, allowing it to be smoothly discharged through the wide opening. This effectively solves the problem of liner grooves being easily clogged by fine powder. Maintaining effective volume and flow prevents blockages that could reduce the effective volume of the grinding chamber and obstruct material flow, ensuring the continuous and stable coarse grinding efficiency of the first chamber. The presence of the unblocking trough also allows it to accommodate some material and fine grinding media during the lifting process, increasing the localized grinding effect during lifting and dropping.

[0022] In this embodiment, see Figure 6 , 7 Each flat liner 51 has a groove 52 on its surface. A wear-resistant plate 53 is fixedly installed in the groove 52. The wear-resistant plate 53 is connected to the bottom of the groove 52 by multi-point welding or screw connection. A guide groove 54 is provided on the wear-resistant plate 53. The guide groove 54 has an arc-shaped cross-section, and multiple grinding teeth 55 are spaced apart along the length of the bottom of the guide groove 54. The composite structure of the flat liner 51 has a groove 52 on the working surface of each flat liner 51 in the second grinding chamber 12. A wear-resistant plate 53 is embedded in the groove 52. The wear-resistant plate 53 is usually made of a material that is more wear-resistant than the liner substrate, such as high-chromium cast iron or ceramic. The guide groove 54 is further processed on the surface of the wear-resistant plate 53. In particular, multiple grinding teeth 55 are spaced apart along the length of the guide groove 54 at the bottom of the guide groove 54 (i.e., the bottom of the groove). The composite wear-resistant structure on the surface of the liner plate, with grooves 52 set on the flat liner plate 51 and a replaceable wear-resistant plate 53 embedded therein, this modular wear-resistant design improves the local wear resistance and maintainability of the liner plate.

[0023] In this embodiment, see Figure 6 , 7A flow guide groove 54 is machined on the surface of the embedded wear-resistant plate 53, and grinding teeth 55 are specially arranged at intervals at the bottom of the flow guide groove 54, integrating the functions of flow guidance, dispersion and local fine grinding. The wear-resistant plate 53 in the groove 52, as a vulnerable part, is made of highly wear-resistant material, effectively protecting the flat liner 51 substrate. When the wear-resistant plate 53 wears, only the wear-resistant plate 53 needs to be replaced, without replacing the entire liner, significantly reducing maintenance costs and extending the overall liner life. The flow guide groove 54 guides fine particles and micro-grinding particles to flow along a specific path, which helps the material to be evenly distributed in the second chamber and to be classified according to particle size (fine particles are easier to move with the flow). When the material and micro-spheres (such as steel segments) flow in the flow guide groove 54, they are repeatedly "bumped", "squeezed" and "sheared" by these raised grinding teeth 55, which greatly enhances the grinding intensity of the fine particles flowing through the flow guide groove, and is particularly suitable for micro-agglomerates that are difficult to crush in the crushing and fine grinding stage and for achieving finer finished particle size requirements. The spacing design avoids excessive flow obstruction while ensuring sufficient grinding points. The guide channel 54 is responsible for optimizing flow and conveying fine materials to the grinding area (teeth), while the grinding teeth 55 focus on high-intensity crushing of the target fine materials. Together, they significantly improve the fine grinding efficiency of the second chamber.

[0024] In this embodiment, specifically, the first liner 4 and the second liner 5 are both fixedly connected to the inner wall of the cylinder 1 by bolts. Multiple bolt holes are provided on both the first liner 4 and the second liner 5, and the first liner 11 and the second liner 5 are fixedly connected to the side wall of the cylinder 1 by bolts and nuts on the side wall of the cylinder 1. Whether it is the first liner 4 of the first grinding chamber 11 (i.e., the assembly of wedge-shaped liners 41) or the second liner 5 of the second grinding chamber 12 (i.e., the assembly of flat liners 51), they are all firmly fixed to the inner wall of the cylinder 1 by bolt connection. The significance of bolt connection in this solution lies in providing a reliable and easy-to-install, disassemble, and maintain connection foundation for the aforementioned complex, partitioned, and modular liner structures (especially stepped wedge-shaped liners and flat liners with grooves / wear-resistant plates). This ensures that liners of various shapes and structures remain stable and do not loosen under high-speed rotation and strong impact vibration working environments. Especially for the stepped wedge-shaped liners 41 and the flat liners 51 that require replacement of wear-resistant plates 53, the bolted connection ensures precise installation and positioning, and makes it easy and quick to disassemble and replace individual liners or wear-resistant plate assemblies, greatly reducing maintenance workload and downtime. This is an important guarantee for realizing the differentiated and modular liner design of this patent.

[0025] In this embodiment, more specifically, see [link to embodiment]. Figure 8The step height of each wedge-shaped liner 41 decreases progressively along the rotation direction of the cylinder 1. The wedge-shaped liners 41, arranged in a stepped pattern within the first grinding chamber 11, have a step height (referring to the radial protrusion of the liner's working surface within the cylinder) that decreases progressively along the working rotation direction of the cylinder 1 (usually marked as counter-clockwise or clockwise from the feed end). That is, in the rotation direction, the preceding liner is radially "higher" than the following liner. While the stepped liners themselves may exist, the specific and regular (gradually decreasing) design of the step height along the mill's rotation direction constitutes a specific, optimized material movement trajectory structure. This allows the liners located at the "higher steps" to first grab and lift the material and grinding media to a higher position before dropping them, generating a strong impact. This increases the effective impact and grinding action. The ordered impact sequence allows the rotational energy input into the mill to be more effectively converted into the impact and shear energy required for crushing the material.

[0026] In this embodiment, more specifically, the diameter of the grinding balls in the first grinding chamber 11 is larger than the diameter of the grinding balls in the second grinding chamber 12. The average diameter (or maximum diameter) of the grinding balls filling the first grinding chamber 11 is greater than the average diameter (or maximum diameter) of the grinding balls filling the second grinding chamber 12. The large balls in the first chamber (large balls and wedge-shaped stepped liners) provide tremendous impact force, which, combined with the optimized strong impact and shearing environment of the stepped wedge-shaped liners, efficiently completes coarse crushing and coarse grinding. The small balls in the second chamber (small balls + flat liners with grinding teeth) provide more contact points and grinding action, which, combined with the stable rolling environment of the flat liners and the fine crushing action of the grinding teeth in the guide grooves, efficiently completes fine grinding and ultrafine grinding. This combination of "large balls + strong impact liners" and "small balls and fine grinding liners" can significantly improve the overall grinding efficiency and product fineness of the machine.

[0027] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope of the invention is indicated by the claims.

[0028] It should be understood that this utility model is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model.

Claims

1. A ball mill grinding device, comprising a cylindrical body (1), wherein a partition plate (2) is disposed inside the cylindrical body (1), the partition plate (2) dividing the cylindrical body (1) into a first grinding chamber (11) and a second grinding chamber (12), characterized in that: Grinding balls are provided in both the first grinding chamber (11) and the second grinding chamber (12). Multiple first liners (4) are provided on the side wall of the first grinding chamber (11). The first liners (4) include multiple wedge-shaped liners (41). Each wedge-shaped liner (41) is distributed in a stepped manner on the circumferential side wall of the first grinding chamber (11). Multiple second liners (5) are provided on the side wall of the second grinding chamber (12). The second liners (5) include multiple flat liners (51) arranged circumferentially on the side wall of the second grinding chamber (12).

2. The ball mill grinding apparatus according to claim 1, characterized in that, Each of the wedge-shaped liner plates (41) has a plurality of unclogging grooves (42) on its surface, and each unclogging groove (42) has an inverted trapezoidal cross-sectional shape.

3. The ball mill grinding apparatus according to claim 1, characterized in that, Each of the flat plate liners (51) has a groove (52) on its surface. A wear-resistant plate (53) is provided in the groove (52). A guide groove (54) is provided on the wear-resistant plate (53). Multiple grinding teeth (55) are provided at intervals along the length direction at the bottom of the guide groove (54).

4. The ball mill grinding apparatus according to claim 1, characterized in that, The first liner (4) and the second liner (5) are both fixedly connected to the inner wall of the cylinder (1) by bolts.

5. A ball mill grinding apparatus according to claim 2, characterized in that, The step height of each wedge-shaped liner (41) decreases gradually along the rotation direction of the cylinder (1).

6. The ball mill grinding apparatus according to claim 1, characterized in that, The diameter of the grinding balls in the first grinding chamber (11) is larger than the diameter of the grinding balls in the second grinding chamber (12).

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