Sand mill

Abstract

The utility model provides a sand mill which comprises a machine body, a milling cylinder is arranged on the machine body, the milling cylinder comprises a cylinder body, a lining ring group is arranged in the cylinder body, the lining ring group comprises two end lining rings which are oppositely arranged, a main lining ring is arranged between the two end lining rings, and the main lining ring is connected with the main lining ring. Cooling cavities are formed between the end lining ring and the cylinder body and between the main lining ring and the cylinder body, spiral fins are arranged in the cooling cavities and form spiral flow channels in the cooling cavities, a plurality of water inlets and water outlets are formed in the cylinder body, each water inlet and each water outlet correspond to one cooling cavity, and the spiral flow channels are communicated with the cooling cavities. A first fixing ring is arranged at the end, used for being connected with a machine body, of the cylinder, a second fixing ring is arranged at the other end of the cylinder, the lining ring set is fixed into the cylinder through the first fixing ring and the second fixing ring together, and an end cover is further arranged at one end of the cylinder. According to the utility model, the independent cooling cavity is utilized to realize partitioned cooling of the milling cylinder, so that the cooling uniformity is improved, and the local temperature difference is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of grinding production equipment, and specifically relates to a sand mill. Background Technology

[0002] A sand mill is an ultrafine grinding device, an essential piece of equipment in paint production, which grinds pigments to nanoscale fineness. A sand mill mainly consists of a motor, rotor, grinding media, and grinding cylinder. Its working principle is that the motor drives the rotor to rotate, which in turn agitates the grinding media inside the grinding cylinder, causing the media to generate high-energy motion. The grinding media achieves finer grinding through collisions, friction, and shearing between itself and the material.

[0003] During the grinding process, a large amount of heat is generated in the grinding chamber and conducted to the grinding cylinder. Some temperature-sensitive materials will deteriorate due to temperature changes during the grinding process. Therefore, sand mills with cooling and temperature control functions have emerged in this field. Patent CN216936306U discloses a sand mill cooling device and a sand mill containing the device. The device sets a shell around the grinding cylinder to form a cooling water chamber between the shell and the grinding cylinder, and circulates cold water to cool the grinding cylinder.

[0004] During equipment operation, the heat distribution within the grinding cylinder is not uniform. The two ends of the grinding cylinder are typically the material inlet and outlet. The cylinder at the material inlet end is usually near the connection between the rotor shaft and the equipment, and is affected by the heat generated by bearings and other components, as well as the relatively coarse particle size of the initial material entering the grinding cylinder, resulting in significant heat generation during grinding. This part of the cylinder has a higher heat level. The middle section of the grinding cylinder is mainly affected by continuous grinding, resulting in more stable and continuous heat generation. The cylinder near the material outlet end has a relatively lower heat level. Although the equipment in the aforementioned patent has a significant cooling effect, because the heat distribution within the grinding cylinder is not uniform and changes in real time due to the grinding process, this uniform cooling method can lead to localized overheating or undercooling of the grinding cylinder, resulting in insufficient cooling uniformity. Utility Model Content

[0005] To overcome the shortcomings and problems of existing technologies, such as the insufficient uniformity of cooling of the grinding cylinder caused by the uniform cooling scheme of existing sand mills, this utility model provides a sand mill.

[0006] This utility model is achieved through the following technical solution:

[0007] A sand mill includes a machine body, on which a grinding cylinder is provided. The grinding cylinder includes a cylindrical body, and an inner lining ring assembly is provided inside the cylindrical body. The inner lining ring assembly includes two opposing end inner lining rings, and a main inner lining ring is provided between the two end inner lining rings. Cooling chambers are provided between the end inner lining rings and the cylindrical body, and between the main inner lining ring and the cylindrical body. Each cooling chamber is provided with spiral fins, and the spiral fins form a spiral flow channel within the cooling chamber. The cylindrical body is provided with a plurality of water inlets and outlets, each water inlet and outlet corresponding to a cooling chamber. One end of the cylindrical body used for connecting to the machine body is provided with a first fixing ring, and the other end is provided with a second fixing ring. The first fixing ring and the second fixing ring together fix the inner lining ring assembly within the cylindrical body. One end of the cylindrical body is also provided with an end cap.

[0008] The outer walls of both ends of the end inner liner ring and the outer walls of both ends of the main inner liner ring are provided with positioning rings, which separate a cooling chamber between the inner liner ring assembly and the cylinder.

[0009] A sealing layer is provided between the positioning ring and the cylinder.

[0010] The sealant layer is fixed to the edge of the positioning ring.

[0011] The main inner liner ring is provided.

[0012] The end of the end liner ring is engaged with the end of the main liner ring.

[0013] The end inner liner ring is provided with engagement grooves at one end near the main inner liner ring and at both ends of the main inner liner ring. The end inner liner ring and the main inner liner ring are engaged and connected through the engagement grooves.

[0014] The edge of the spiral fin is provided with a fixing groove, and a sealing strip is fixed in the fixing groove.

[0015] The inner lining ring assembly is made of silicon carbide.

[0016] 1. In this utility model, multiple cooling chambers are formed between the inner lining ring assembly and the cylinder body, which can perform corresponding cooling work according to the different heat of different parts of the grinding cylinder, effectively control the temperature, reduce the occurrence of local overcooling or overheating of the grinding cylinder, and improve the temperature uniformity of the grinding cylinder.

[0017] 2. The inner liner ring assembly in this utility model allows for the separate replacement of the end inner liner ring and the main inner liner ring according to different wear conditions, resulting in lower replacement costs compared to traditional one-piece inner liners.

[0018] 3. This utility model only requires disassembling the end cap and the second fixing ring to remove the inner liner ring assembly, which is highly convenient when cleaning the cooling cavity or replacing the inner liner ring. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0020] Figure 2 This is a schematic diagram of the cross-sectional structure of the grinding cylinder of this utility model;

[0021] Figure 3 This is a schematic diagram of the inner lining ring assembly structure of this utility model.

[0022] Figure 4 This is a schematic diagram of the inner lining ring assembly connection of this utility model.

[0023] Figure 5 This is a schematic diagram of the fixing groove structure of this utility model;

[0024] In the diagram: 100-body, 200-grinding cylinder, 210-cylinder body, 211-water inlet, 212-water outlet, 220-inner liner ring assembly, 221-end inner liner ring, 222-main inner liner ring, 223-positioning ring, 224-cooling chamber, 225-spiral fins, 226-fixing groove, 227-sealing strip, 228-sealing layer, 229-meshing groove, 230-first fixing ring, 240-second fixing ring, 250-end cover. Detailed Implementation

[0025] To facilitate understanding by those skilled in the art, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] like Figure 1 , 2 As shown, a sand mill includes a body 100, on which a grinding cylinder 200 is mounted. The grinding cylinder 200 is used to load grinding media and materials for grinding. The grinding cylinder 200 includes a cylinder body 210, inside which an inner liner ring assembly 220 is provided. The inner liner ring assembly 220 forms an integral component with a hollow inner cavity, which is the space for accommodating the grinding media and materials. Because the grinding media has high strength, to avoid wear of the inner liner ring assembly 220 due to friction and collision of the grinding media, which could contaminate the materials, the inner liner ring assembly 220 is made of silicon carbide. Silicon carbide has high wear resistance and is a common material used for making sand mill liners. Simultaneously, silicon carbide has high thermal conductivity and good heat dissipation performance.

[0027] like Figure 2 , 3As shown, the inner liner ring assembly 220 includes two opposing end inner liner rings 221, which are located at both ends of the inner liner ring assembly and close to both ends of the cylinder 210. A main inner liner ring 222 is provided between the two end inner liner rings 221. The main inner liner ring 222 corresponds to the main grinding position of the grinding cylinder 200 in terms of positional relationship. During long-term operation of the equipment, the inner liner ring assembly 220 will gradually wear down. The end inner liner rings 221 or the main inner liner ring 222 can be replaced according to the different wear conditions. Compared with the traditional one-piece inner liner that requires the entire assembly to be replaced, the replacement and maintenance cost of the inner liner ring assembly 220 in this embodiment is lower.

[0028] like Figure 2 , 3 As shown in Figure 4, cooling chambers 224 are provided between the end inner liner ring 221 and the cylinder 210, and between the main inner liner ring 222 and the cylinder 210. By circulating cooling water in each cooling chamber 224, cooling of different parts of the grinding cylinder 200 can be achieved, realizing the function of zoned cooling, reducing the local temperature difference of the grinding cylinder 200, improving the durability of the grinding cylinder 200, and reducing the impact of local temperature difference on the material. The outer walls of both ends of the end inner liner ring 221 and the outer walls of both ends of the main inner liner ring 222 are provided with positioning ring portions 223. The positioning ring portions 223 are used to stabilize the position of the inner liner ring assembly 220 inside the cylinder 210. At the same time, the cooling chambers 224 are separated between the inner liner ring assembly 220 and the cylinder 210 by the positioning ring portions 223. A sealing layer 228 is provided between the positioning ring 223 and the cylinder 210. The sealing layer 228 is made of heat-resistant rubber, which can ensure the sealing of each cooling cavity 224 and prevent adjacent cooling cavities 224 from being connected and affecting the cooling effect. The sealing layer 228 is fixed to the edge of the positioning ring 223. In practical applications, it can be fixed by means of pasting, clamping, etc. After the sealing layer 228 is removed, the inner lining ring assembly 220 can be removed from the grinding cylinder 200 and the sealing layer 228 can be directly replaced.

[0029] like Figure 3 , 4 As shown, the main inner liner ring 222 is provided, and the end inner liner ring 221 is provided with engagement grooves 229 at one end near the main inner liner ring 222 and at both ends of the main inner liner ring 222. The end inner liner ring 221 and the main inner liner ring 222 are engaged and connected through the engagement grooves 229. The cylinder body 210 is provided with a first fixing ring 230 at one end for connecting to the machine body 100, and a second fixing ring 240 at the other end. The first fixing ring 230 and the second fixing ring 240 are both connected to the cylinder body 210 by bolts, which together fix the inner liner ring assembly 220 inside the cylinder body 210, and at the same time press the main inner liner ring 222 and the end inner liner ring 221 together. The engagement grooves 229 effectively improve the tightness of the connection between the main inner liner ring 222 and the end inner liner ring 221 and prevent material from seeping into the connection.

[0030] like Figure 2 , 3 As shown in Figures 4 and 5, each cooling chamber 224 is provided with a spiral fin 225. The spiral fin 225 forms a spiral flow channel within the cooling chamber 224, which can reduce the dead zone of cooling water flow and improve the cooling effect. The spiral fin 225 is disposed on the outer wall of the inner liner ring assembly 220. Since the inner liner ring assembly 220 is made of silicon carbide, it can be produced using molds, milling, etc. The spiral fin 225 can be integrated with the inner liner ring assembly 220 and processed together during production. Integrating the spiral fin 225 with the inner liner ring assembly 220 also helps to conduct the heat of the inner liner ring assembly 220 to the cooling chamber 224. In actual operation, the number of spiral turns of the spiral fin 225 can be set as needed. The edge of the spiral fin 225 is provided with a fixing groove 226, and a sealing strip 227 is fixed in the fixing groove 226. The sealing strip 227 is in contact with the inner wall of the cylinder 210 to ensure the sealing of the spiral flow channel and prevent water flow turbulence. One end of the cylinder 210 is also provided with an end cap 250, which is used to seal the grinding cylinder 200 to ensure the normal operation of the grinding work. The cylinder 210 is also provided with a number of water inlets 211 and water outlets 212, each of which corresponds to a cooling chamber 224. The cooling water in the cooling chamber 224 can be circulated through the water inlets 211 and water outlets 212.

[0031] The above embodiments are preferred implementations of this utility model and are not intended to limit this utility model. Any obvious substitutions are within the protection scope of this utility model without departing from its inventive concept.

Claims

1. A sand mill comprising a body (100), characterised in that: The machine body (100) is provided with a grinding cylinder (200), the grinding cylinder (200) comprises a cylinder body (210), the cylinder body (210) is internally provided with an inner liner ring group (220), the inner liner ring group (220) comprises two oppositely arranged end inner liner rings (221), a main inner liner ring (222) is arranged between the two end inner liner rings (221), cooling cavities (224) are arranged between the end inner liner rings (221) and the cylinder body (210) and between the main inner liner ring (222) and the cylinder body (210), a spiral fin (225) is arranged in each cooling cavity (224), the spiral fin (225) forms a spiral flow channel in the cooling cavity (224), the cylinder body (210) is provided with a plurality of water inlets (211) and water outlets (212), each water inlet (211) and water outlet (212) corresponds to a cooling cavity (224), one end of the cylinder body (210) for connecting the machine body (100) is provided with a first fixing ring (230), and the other end is provided with a second fixing ring (240), the first fixing ring (230) and the second fixing ring (240) jointly fix the inner liner ring group (220) in the cylinder body (210), and one end of the cylinder body (210) is further provided with an end cover (250).

2. A sander as claimed in claim 1, characterized in that: The two end outer walls of the end inner liner ring (221) and the two end outer walls of the main inner liner ring (222) are provided with positioning ring portions (223), and the positioning ring portions (223) divide the cooling cavities (224) between the inner liner ring group (220) and the cylinder body (210).

3. A sander as claimed in claim 2, characterized in that: A sealing rubber layer (228) is arranged between the positioning ring portion (223) and the cylinder body (210).

4. A sander as claimed in claim 3, characterized in that: The sealing rubber layer (228) is fixed to the edge of the positioning ring portion (223).

5. A sander as claimed in claim 1, characterized in that: The main inner liner ring (222) is provided with one.

6. A sander as claimed in claim 5, characterized in that: The end portion of the end inner liner ring (221) is engagedly connected with the end portion of the main inner liner ring (222).

7. A sander as claimed in claim 6, characterized in that: The end portion of the end inner liner ring (221) close to the main inner liner ring (222) and the two end portions of the main inner liner ring (222) are provided with engagement grooves (229), and the end inner liner ring (221) and the main inner liner ring (222) are engagedly connected through the engagement grooves (229).

8. A sander as claimed in claim 1, characterized in that: The edge of the spiral fin (225) is provided with a fixing groove (226), and a sealing rubber strip (227) is fixed in the fixing groove (226).

9. A sander according to any one of claims 1-8, characterized in that: The inner liner ring group (220) is made of silicon carbide.

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