A ball mill for grinding and preparing fine iron oxide pigments

Abstract

This utility model relates to the field of ball mill technology, specifically disclosing a ball mill for grinding and preparing fine iron oxide pigments. The mill includes a grinding mechanism, comprising a roller rotatably mounted on a support frame. The roller is a multi-segmented, unequal-diameter structure arranged coaxially, consisting of a coarse grinding roller and a fine grinding roller connected sequentially from the feed end to the discharge end. The inner wall of the coarse grinding roller is fixedly connected with multiple annularly distributed corrugated liners, and the inner wall of the fine grinding roller is fixedly connected with multiple annularly distributed strip liners. By adopting a multi-segmented, unequal-diameter roller design, the corrugated liners in the coarse grinding roller enhance the impact force of large grinding balls, achieving efficient crushing of large particles; the strip liners in the fine grinding roller strengthen the tumbling and shearing motion of small grinding balls, ensuring fine grinding of the micro-powder. This allows the equipment to complete the continuous process from coarse to fine grinding in a single operation, significantly improving grinding efficiency and the uniformity of product fineness.

Description

Technical Field

[0001] This utility model relates to the field of ball mill technology, and specifically discloses a ball mill for grinding and preparing fine iron oxide pigments. Background Technology

[0002] In the preparation of fine iron oxide pigments, the grinding process is a key step that determines the fineness, uniformity and performance of the product. As the core equipment in this process, the performance of the ball mill directly affects the quality of the pigment product and the production efficiency.

[0003] Traditional ball mills typically employ a single-stage drum structure, with a uniform inner diameter and grinding media of a single particle size. This structure struggles to simultaneously meet the demands of coarse and fine grinding. While using large-diameter grinding media can efficiently crush large particles, it results in poor fine grinding. Conversely, using small-diameter grinding media, although improving the fineness, leads to low overall grinding efficiency due to insufficient crushing capacity. Furthermore, the high-speed rotation of the drum during grinding generates significant heat due to the intense collisions and friction between the grinding media and the material. Traditional ball mills lack efficient cooling systems, which can cause excessively high temperatures in the drum and the internal material, potentially altering the properties of iron oxide pigments and affecting product quality. Therefore, a ball mill for the preparation of fine iron oxide pigments is needed to address this issue. Utility Model Content

[0004] This utility model proposes a ball mill for grinding and preparing fine iron oxide pigments. By adopting a multi-segment unequal diameter drum design, the grinding efficiency and product fineness uniformity are improved. The grinding heat is removed by a cooling mechanism, which can effectively control the temperature of the drum and the material.

[0005] This utility model is implemented as follows: a ball mill for grinding and preparing fine iron oxide pigment includes a support frame. A grinding mechanism is set above the support frame via a drive mechanism. The grinding mechanism includes a roller rotatably mounted on the support frame. The two ends of the roller are respectively connected to a feed port and a discharge port. The drive mechanism includes a drive motor mounted on the support frame. The output end of the drive motor is fixedly connected to a small gear via a reducer. The outer wall of the small gear meshes with a large gear fixedly connected to the outer wall of the roller. The roller is a multi-segment unequal diameter structure arranged coaxially. From the feed end to the discharge end, it includes a coarse grinding roller and a fine grinding roller that are connected to each other. The inner diameter of the coarse grinding roller is larger than the inner diameter of the fine grinding roller. Multiple annularly distributed corrugated liners are fixedly connected to the inner wall of the coarse grinding roller. Multiple annularly distributed strip liners are fixedly connected to the inner wall of the fine grinding roller. The interiors of the coarse grinding roller and the fine grinding roller are filled with grinding media of different particle sizes.

[0006] The outer wall of the grinding mechanism is provided with a cooling mechanism; The cooling mechanism includes a cooling jacket fitted on the outer wall of the drum. The inner wall of the cooling jacket is fixedly connected with an inclined guide plate, and the outer wall of the cooling jacket is connected to a coolant inlet and an outlet.

[0007] In a preferred embodiment of the ball mill for grinding and preparing fine iron oxide pigments according to this utility model, a filter plate is provided at the connection between the coarse grinding roller and the fine grinding roller.

[0008] In a preferred embodiment of the ball mill for preparing fine iron oxide pigments according to this utility model, the grinding media in the coarse grinding drum is large grinding balls, and the grinding media in the fine grinding drum is small grinding balls.

[0009] In a preferred embodiment of the ball mill for grinding and preparing fine iron oxide pigments according to this utility model, the filter plate has a conical structure with the cone apex facing the feeding direction.

[0010] As a preferred embodiment of the ball mill for grinding and preparing fine iron oxide pigments according to this utility model, both the inlet and outlet ends are threaded with sealing caps.

[0011] In a preferred embodiment of the ball mill for grinding and preparing fine iron oxide pigments according to this utility model, a controller is installed on the front end face of the right side of the support frame, and the drive motor and the controller are electrically connected.

[0012] The beneficial effects of this utility model are: 1. By adopting a multi-segment unequal diameter drum design, combined with grinding media of different particle sizes and targeted liners, the corrugated liner in the coarse grinding drum enhances the impact force of large grinding balls, achieving efficient crushing of large particles; the strip liner in the fine grinding drum strengthens the tumbling and shearing motion of small grinding balls, ensuring fine grinding of micro powders, so that the equipment can complete the continuous process from coarse grinding to fine grinding in a single run, greatly improving grinding efficiency and product fineness uniformity; 2. The cooling jacket in the cooling mechanism, together with the inclined guide plate, allows the coolant to flow evenly across the outer wall of the drum, efficiently removing grinding heat. This effectively controls the temperature of the drum and the material, preventing changes in the properties of the iron oxide pigment due to high temperatures and ensuring product quality. Attached Figure Description

[0013] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0014] Figure 1 This is a front sectional view of a ball mill for grinding and preparing fine iron oxide pigments according to this utility model.

[0015] Figure 2 This is an overall structural diagram of the roller and cooling jacket of this utility model.

[0016] Figure 3 This is a side view of the precision grinding roller of this utility model.

[0017] The markings in the diagram are: 1. Support frame; 2. Drive motor; 201. Reducer; 202. Pinion; 203. Gear; 3. Coarse grinding drum; 301. Corrugated liner; 302. Large grinding ball; 4. Fine grinding drum; 401. Strip liner; 402. Small grinding ball; 5. Filter plate; 6. Cooling jacket; 601. Guide plate. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0019] Please see Figure 1-3 A ball mill for preparing fine iron oxide pigment includes a support frame 1. A grinding mechanism is mounted on top of the support frame 1 via a drive mechanism. The grinding mechanism includes a roller rotatably mounted on the support frame 1, with a feed inlet and a discharge outlet at both ends. The drive mechanism includes a drive motor 2 mounted on the support frame 1. A pinion 202 is fixedly connected to the output end of the drive motor 2 via a reducer 201. A large gear 203, fixedly connected to the outer wall of the roller, meshes with the outer wall of the pinion 202. The drum is a multi-segment unequal diameter structure with coaxial arrangement. From the feed end to the discharge end, it includes a coarse grinding drum 3 and a fine grinding drum 4 that are connected to each other. The inner diameter of the coarse grinding drum 3 is larger than the inner diameter of the fine grinding drum 4. Multiple annularly distributed corrugated liners 301 are fixedly connected to the inner wall of the coarse grinding drum 3. Multiple annularly distributed strip liners 401 are fixedly connected to the inner wall of the fine grinding drum 4. The interior of the coarse grinding drum 3 and the fine grinding drum 4 are filled with grinding media of different particle sizes. A cooling mechanism is provided on the outer wall of the grinding mechanism; The cooling mechanism includes a cooling jacket 6 fitted on the outer wall of the drum. The inner wall of the cooling jacket 6 is fixedly connected with an inclined guide plate 601, and the outer wall of the cooling jacket 6 is connected to a coolant inlet and an outlet.

[0020] In this embodiment, a multi-segment drum design with progressively decreasing inner diameter is adopted, and grinding media of different particle sizes are filled in two separate drums. The material is first initially crushed and ground in a coarse grinding drum 3 with a larger volume and larger media particle size, achieving efficient large-particle crushing. Subsequently, it enters a fine grinding drum 4 with a smaller volume and smaller media particle size for fine grinding, effectively improving the grinding efficiency and precision of a single pass. By setting a corrugated liner 301 inside the coarse grinding drum 3, the large-particle grinding media (large grinding balls 302) can be effectively lifted during drum rotation, and the impact force generated when they fall greatly optimizes the crushing effect on large particles. A strip liner 401 inside the fine grinding drum 4 primarily provides sufficient tumbling and shearing motion to the small-particle grinding media (small grinding balls 402) during drum rotation, enhancing the friction and shearing action between materials. This is particularly beneficial for the grinding and surface treatment of fine powders, thereby significantly improving the fineness and uniformity of the final product. The cooling mechanism allows the coolant to flow fully and evenly within the jacket 6, facilitating efficient heat exchange with the high-speed grinding mechanism that generates a large amount of heat. This structure rapidly removes the heat generated during the grinding process, effectively controlling the temperature of the drum and the internal materials, and preventing changes in material properties due to excessive temperature.

[0021] As a technical optimization of this utility model, a filter plate 5 is provided at the connection between the coarse grinding roller 3 and the fine grinding roller 4.

[0022] In this embodiment, the filter plate 5 allows material particles that have reached a certain fineness requirement after coarse grinding to pass through and enter the fine grinding stage, while large particles that have not yet met the requirements are blocked in the coarse grinding drum 3 for further grinding. This achieves a "screening" classification process for the material, ensuring the basic particle size of the material entering the fine grinding stage and avoiding excessively large particles from affecting the fine grinding effect and equipment load.

[0023] As a technical optimization of this utility model, the grinding medium in the coarse grinding roller 3 is a large grinding ball 302, and the grinding medium in the fine grinding roller 4 is a small grinding ball 402.

[0024] In this embodiment, the use of large grinding balls 302 and small grinding balls 402 facilitates the grinding and surface treatment of fine powders, thereby significantly improving the fineness and uniformity of the final product.

[0025] As a technical optimization of this utility model, the filter plate 5 has a conical structure with its cone apex facing the feeding direction.

[0026] In this embodiment, by designing the filter plate 5 as a cone with the cone apex facing the feeding direction, a guiding structure similar to a "trumpet mouth" is formed. This structure utilizes the dynamic characteristics of material flow to guide and diffuse the material flow rushing towards the filter plate 5, effectively reducing the concentrated impact and accumulation pressure of material on the center of the filter plate 5, and reducing the risk of filter plate 5 clogging.

[0027] As a technical optimization of this utility model, both the inlet and outlet ends are threaded with sealing caps.

[0028] In this embodiment: the sealing cap is opened to facilitate the flow of coolant into the cooling jacket 6, and the inlet and outlet can be sealed.

[0029] As a technical optimization of this utility model, a controller is installed on the front end face of the right side of the support frame 1, and the drive motor 2 is electrically connected to the controller.

[0030] In this embodiment, the drive motor 2 can be controlled to operate via a controller.

[0031] The working principle and usage process of this utility model are as follows: The drive motor 2 drives the small gear 202 to rotate through the reducer 201. The small gear 202 meshes with the large gear 203 on the outer wall of the drum, thereby driving the entire drum to rotate on the support frame 1. After the material enters the drum from the feed port, it first enters the coarse grinding drum 3. The wavy liner 301 on the inner wall of the coarse grinding drum 3 rotates with the drum, continuously lifting the large grinding balls 302 filled inside to a certain height and then letting them fall. The impact force of the large grinding balls 302 is used to perform preliminary crushing and coarse grinding on the material. When the material is ground to a certain fineness, it will move towards the fine grinding drum 4 under the driving force generated by the rotation of the drum. When it reaches the connection between the coarse grinding drum 3 and the fine grinding drum 4, the material particles that meet the fineness requirements will enter the fine grinding drum 4 through the filter holes of the conical filter plate 5; the large particles that do not meet the requirements will be blocked by the filter plate 5 and continue to be ground in the coarse grinding drum 3. The material entering the fine grinding drum 4 is driven by the strip liner 401 on its inner wall to make the small grinding balls 402 inside fully tumble and shear. Through the friction and shearing action between the small grinding balls 402 and the material, and between the materials themselves, the material is finely ground. During this process, coolant is introduced into the cooling jacket 6 through the coolant inlet. The inclined guide plate 601 guides the coolant to flow evenly within the jacket, ensuring full contact with the outer wall of the drum and efficiently absorbing the heat generated during grinding. The cooled coolant, after absorbing heat, is discharged from the outlet, thus achieving temperature control of the drum and the material inside. Throughout the grinding process, the operating parameters of the drive motor 2 can be adjusted via the controller to control the drum speed to adapt to different grinding requirements. Finally, the qualified ground material is discharged from the discharge port.

[0032] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0033] However, the above description is merely a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A ball mill for preparing fine iron oxide pigment by grinding, comprising a support frame (1), a grinding mechanism being provided above the support frame (1) via a drive mechanism, the grinding mechanism comprising a roller rotatably mounted on the support frame (1), the two ends of the roller being respectively connected to a feed inlet and a discharge outlet, the drive mechanism comprising a drive motor (2) mounted on the support frame (1), the output end of the drive motor (2) being fixedly connected to a small gear (202) via a reducer (201), the outer wall of the small gear (202) meshing with a large gear (203) fixedly connected to the outer wall of the roller, characterized in that: The roller is a multi-segment unequal diameter structure arranged coaxially. From the feed end to the discharge end, it includes a coarse grinding roller (3) and a fine grinding roller (4) that are connected to each other. The inner diameter of the coarse grinding roller (3) is larger than the inner diameter of the fine grinding roller (4). The inner wall of the coarse grinding roller (3) is fixedly connected with a plurality of annularly distributed corrugated liners (301). The inner wall of the fine grinding roller (4) is fixedly connected with a plurality of annularly distributed strip liners (401). The interior of the coarse grinding roller (3) and the fine grinding roller (4) is filled with grinding media of different particle sizes. The outer wall of the grinding mechanism is provided with a cooling mechanism; The cooling mechanism includes a cooling jacket (6) fitted on the outer wall of the drum. The inner wall of the cooling jacket (6) is fixedly connected with an inclined guide plate (601). The outer wall of the cooling jacket (6) is connected to a coolant inlet and an outlet.

2. The ball mill for the preparation of fine iron oxide pigment according to claim 1, wherein: A filter plate (5) is provided at the connection between the coarse grinding roller (3) and the fine grinding roller (4).

3. A ball mill for the production of a fine iron oxide pigment according to claim 1, characterized in that: The grinding media in the coarse grinding roller (3) is large grinding balls (302), and the grinding media in the fine grinding roller (4) is small grinding balls (402).

4. A ball mill for the production of a fine iron oxide pigment according to claim 2, characterized in that: The filter plate (5) has a conical structure with its cone apex facing the feeding direction.

5. The ball mill for the preparation of fine iron oxide pigment according to claim 1, wherein: Both the inlet and outlet ends are threaded with sealing caps.

6. The ball mill for the preparation of fine iron oxide pigment according to claim 1, wherein: A controller is installed on the front end face of the right side of the support frame (1), and the drive motor (2) is electrically connected to the controller.

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