A new type of auxiliary grinding device for grinding disc of sand mill

Abstract

This utility model relates to a novel grinding disc-assisted grinding device for a sand mill, comprising a frame, a variable frequency motor fixedly installed inside the frame, a bearing seat fixedly installed above the frame, a drive shaft mounted on the bearing seat, the variable frequency motor and the drive shaft connected by a drive belt device, a grinding cylinder fixedly mounted on the bearing seat by grinding cylinder fixing bolts, and an end cap fixedly mounted on the other end of the grinding cylinder by end cap fixing bolts. The bearing seat, grinding cylinder and end cap form a sealed grinding chamber, in which a grinding disc, a conical spacer and a rotor are arranged. The conical spacer is a spacer with a tapered structure. The grinding disc and the conical spacer are mounted on the drive shaft, and the rotor is mounted at the farthest end of the drive shaft. The stirring device composed of the grinding disc, the conical spacer and the rotor rotates with the drive shaft. This utility model solves the problems of traditional cylindrical spacers not being able to fully utilize the grinding chamber space and having low grinding efficiency, and square spacers having high energy consumption and relatively insufficient uniform mixing ability.

Description

Technical Field

[0001] This utility model relates to the field of grinding equipment technology, specifically a novel grinding disc auxiliary grinding device for a sand mill. Background Technology

[0002] Sand mills are the most common and efficient wet ultrafine grinding equipment. They utilize the friction, compression, and impact between grinding media to achieve uniform dispersion and fine grinding of solid-liquid mixtures. Sand mills can not only effectively disperse materials but also break particles to micron or even nanometer levels. This equipment is widely used in the grinding and dispersion of materials in daily chemical and food industries such as coatings, pigments, paints, inks, adhesives, cosmetics, papermaking, food, insulating materials, and magnetic materials.

[0003] Existing sand mills primarily utilize the grinding discs within the agitator shaft assembly to agitate the grinding media within the grinding chamber. Grinding is achieved through friction, compression, and collision between the grinding media. The spacers in the agitator shaft assembly are mostly cylindrical, with a smaller number being square. Cylindrical spacers, due to their shape, have virtually no agitation effect on the grinding media during material processing; they primarily serve to separate and position the grinding discs, failing to fully utilize the grinding space within the grinding chamber, resulting in low grinding efficiency and capacity. Square spacers, on the other hand, not only separate and position the grinding discs but also possess considerable... The square bushing provides considerable auxiliary grinding effect, making fuller use of the grinding chamber space and greatly improving the efficiency of grinding materials. However, the square bushing also has significant limitations due to its shape. When agitating the grinding media and materials, the force it experiences is perpendicular to the bushing, and its direction of action is relatively singular. This results in poor uniform mixing and grinding of nearby materials and grinding media, and generates significant resistance. As a result, while improving the grinding efficiency, the energy consumption of the sand mill also increases significantly, and it may even require a larger variable frequency motor to meet the increased energy consumption. Utility Model Content

[0004] The purpose of this utility model is to address the above-mentioned shortcomings by providing a new type of grinding disc auxiliary grinding device for a sand mill. This device solves the problems of traditional cylindrical spacers not being able to fully utilize the grinding chamber space and having low grinding efficiency, as well as square spacers having high energy consumption and relatively insufficient uniform mixing ability.

[0005] To achieve the above objectives, a novel grinding disc-assisted grinding device for a sand mill is designed, comprising a frame 1, inside which a variable frequency motor 2 is fixedly installed. A bearing seat 5 is fixedly installed above the frame 1, and a drive shaft 4 is fixedly mounted on the bearing seat 5. The variable frequency motor 2 and the drive shaft 4 are connected via a transmission belt device 3, which transmits power from the variable frequency motor 2 to the drive shaft 4, causing the drive shaft 4 to rotate. A grinding cylinder is fixedly mounted on the bearing seat 5 using grinding cylinder fixing bolts 6. 7. The other end of the grinding cylinder 7 is fixed with an end cap 13 by an end cap mounting bolt 14. The bearing seat 5, the grinding cylinder 7 and the end cap 13 form a closed grinding chamber. The grinding chamber is provided with a grinding disc 8, a conical spacer 9 and a rotor 11. The conical spacer 9 is a spacer with a tapered structure. The grinding disc 8 and the conical spacer 9 are mounted on the drive shaft 4. The rotor 11 is mounted at the farthest end of the drive shaft 4. The stirring device composed of the grinding disc 8, the conical spacer 9 and the rotor 11 rotates with the drive shaft 4.

[0006] Furthermore, grooves are evenly distributed along the circumference of the drive shaft 4, and a round key 16 is installed in the groove of the drive shaft 4. The grinding disc 8 and the conical spacer 9 are aligned with the round key 16 and installed on the drive shaft 4. Spacer sealing rings 15 are installed at both ends of the conical spacer 9, and the radial rotation of the grinding disc 8 and the conical spacer 9 is effectively restricted by the round key 16.

[0007] Furthermore, the rotor 11 is installed on the outside of the outermost grinding disc 8, and a pressure cover 10 is installed in the recessed area inside the rotor 11. The lifting bolt 12 passes through the pressure cover 10 and through the threaded hole at the top of the drive shaft 4 to press and fix the grinding disc 8, the conical spacer 9, the pressure cover 10, the rotor 11 and the spacer sealing ring 15 together.

[0008] Furthermore, the grinding disc 8 and the conical spacer 9 are arranged and installed at intervals, and the spacer sealing ring 15 is filled and installed in the sealed assembly gap between the grinding disc 8 and the conical spacer 9. The grinding disc 8, the spacer sealing ring 15, the conical spacer 9 and the spacer sealing ring 15 are arranged and fixed to the drive shaft 4 in sequence.

[0009] Furthermore, the cross-section of the conical spacer 9 is V-shaped, and the intersection point A of the perpendicular bisector of the hypotenuse of the conical spacer 9 and the grinding disk 8 is located at the apex of the near-end side of the grinding disk 8, which further increases the collision frequency and action density of the grinding media, thereby improving the dispersion grinding efficiency and product quality.

[0010] Furthermore, the length X of the conical spacer 9 is equal to the dimension Y from the midpoint of its single-sided taper to the outermost edge of the grinding disk 8, thereby achieving a better dispersion grinding effect and efficiency of the sand mill.

[0011] Compared with the prior art, this utility model has the following advantages:

[0012] (1) By designing the outer shape of the partition sleeve as a conical structure, when the grinding mill processes materials, the materials and grinding media in the grinding chamber collide with the conical surface, and the media achieve a better particle size distribution in multiple relatively independent grinding spaces formed between the grinding disc, the conical partition sleeve and the inner wall of the grinding cylinder. This effectively avoids the phenomenon of insufficient or excessive grinding of materials in some areas, and significantly improves the dispersibility and grinding uniformity of materials.

[0013] (2) The conical structure of this utility model significantly increases the collision frequency and energy density of the grinding media during the material grinding process, generating stronger shearing action and more intense turbulence effect, and greatly improving the dispersion grinding efficiency of the sand mill.

[0014] (3) The conical septum of this utility model can also improve the flow characteristics of the slurry. While promoting full contact between the grinding media and the material, it avoids the slurry from accumulating in the corner area of ​​the septum, thereby optimizing the dispersion and grinding effect of the material, significantly reducing the risk of equipment blockage, and ensuring the stability of large-scale continuous production.

[0015] (4) The conical spacer of this utility model has a larger surface area and excellent fluidity of the slurry, which has more efficient heat dissipation performance. It can effectively avoid changes in material properties caused by excessive local temperature, and shows significant advantages when processing heat-sensitive materials.

[0016] (5) The conical structure design of this utility model reduces the resistance to the flow of materials and grinding media. Under the same working conditions, the unit energy consumption of material grinding is reduced by about 12%. At the same time, the more dispersed impact of the grinding media reduces the wear of the conical sleeve, extending its working life by about 10%.

[0017] In summary, the sand mill using the grinding disc-assisted grinding device of this utility model has higher dispersion and grinding efficiency, significantly improves the unit production capacity of equipment with the same volume, and results in a more concentrated particle size distribution and superior quality of the final product. It is particularly outstanding when processing temperature-sensitive or high-viscosity slurries. The energy consumption for processing the same unit of slurry is significantly reduced, resulting in significant energy-saving and cost-reducing advantages. This sand mill can maintain stable and efficient operation for an extended period of time. The conical spacer can be interchanged with the original spacer, resulting in lower equipment upgrade costs and fully controllable customer procurement investment. It solves a series of technical problems, such as the inability of traditional cylindrical spacers to fully utilize the grinding chamber space and the low grinding efficiency, as well as the high energy consumption and relatively insufficient uniform mixing capacity of square spacers. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2This is a partial schematic diagram of the relatively independent grinding space formed by the assembly of some parts of this utility model;

[0020] Figure 3 This is a schematic diagram of the conical spacer, grinding disc, and circular key of this utility model mounted on the drive shaft;

[0021] Figure 4 This is a schematic diagram showing the dimensional proportions of the space formed between the conical spacer and the grinding disc of this utility model;

[0022] Figure 5 This is the front view of the conical spacer of this utility model;

[0023] Figure 6 This is a left view of the conical spacer of this utility model;

[0024] In the diagram: 1. Frame; 2. Variable frequency motor; 3. Drive belt device; 4. Drive shaft; 5. Bearing housing; 6. Grinding cylinder fixing bolt; 7. Grinding cylinder; 8. Grinding disc; 9. Conical spacer; 10. Pressure cover; 11. Rotor; 12. Hanging bolt; 13. End cover; 14. End cover fixing bolt; 15. Spacer sealing ring; 16. Circular key. Detailed Implementation

[0025] This utility model provides a novel grinding disc auxiliary grinding device for a sand mill, including a frame 1, a variable frequency motor 2, a transmission belt device 3, a transmission shaft 4, a bearing seat 5, grinding cylinder fixing bolts 6, a grinding cylinder 7, a grinding disc 8, a conical spacer 9, a pressure cap 10, a rotor 11, a lifting bolt 12, an end cap 13, an end cap fixing bolt 14, a spacer sealing ring 15, and a key 16. The variable frequency motor 2 is fixedly installed inside the frame 1, the bearing seat 5 is fixedly installed above the frame 1, and the transmission shaft 4 is installed and fixed on the bearing seat 5. The variable frequency motor 2 and the transmission shaft 4 are connected by the transmission belt device 3, which transmits the power of the variable frequency motor 2 to the transmission shaft 4, driving the transmission shaft 4 to rotate. The grinding cylinder 7 is fixed by the grinding cylinder fixing bolts 6. The end cap 13 is fixed to the grinding cylinder 7 by the end cap fixing bolt 14 and the bearing housing 5. After the bearing housing 5, the grinding cylinder 7 and the end cap 13 are assembled together, they form a closed grinding chamber space. The circular key 16 is installed in the groove of the drive shaft 4. The grinding disc 8 and the conical spacer 9 are aligned with the circular key 16 and installed on the drive shaft 4. The two ends of the conical spacer are respectively equipped with spacer sealing rings 15. The rotor 11 is installed on the outer side of the outermost grinding disc 8. The pressure cover 10 is installed in the recessed platform inside the rotor 11. The lifting bolt 12 passes through the pressure cover 10 and the threaded hole at the top of the drive shaft 4 to press and fix the grinding disc 8, the conical spacer 9, the pressure cover 10, the rotor 11 and the spacer sealing ring 15 together to form a complete stirring system.

[0026] The new grinding disc auxiliary grinding device of this sand mill adopts a spacer with a tapered structure. Its design can simultaneously improve the inherent defects of cylindrical and square spacers. The processing difficulty of this component is between that of cylindrical and square spacers, and the three types of spacers are interchangeable, which provides convenience for the technical transformation of traditional sand mills and significantly broadens the applicability of the product. By using this tapered spacer, customers can achieve higher production capacity and obtain better quality ground products on sand mills with the same grinding cylinder volume and motor power.

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0028] like Figure 1 and Figure 2 As shown, the variable frequency motor 2 and bearing housing 5 are fixed on the frame 1, the drive shaft 4 is mounted and fixed on the bearing housing 5, and the two ends of the transmission belt device 3 are connected to the power output shaft of the variable frequency motor 2 and the drive shaft 4 respectively, continuously transmitting the power generated by the variable frequency motor 2 to the drive shaft 4. The above parts constitute the power system of the sand mill; the grinding cylinder fixing bolt 6 installs and fixes the grinding cylinder 7 on the bearing housing 5, and the end cover 13 is installed and fixed on the grinding cylinder 7 by the end cover fixing bolt 14. The bearing housing 5, the grinding cylinder 7, and the end cover 13 constitute a complete grinding chamber of the sand mill; as Figure 3 As shown, circular keys 16 are evenly distributed in the semi-circular keyways of the drive shaft 4. Grinding disc 8, spacer seal ring 15, conical spacer 9 and spacer seal ring 15 are sequentially arranged and fixed on the drive shaft 4. The semi-circular keyways of the grinding disc 8 and the conical spacer 9 are aligned with the circular keys 16. The rotor 11 is assembled at the farthest end of the drive shaft 4, and the pressure cover 10 is installed in the inner recessed platform of the rotor 11. The tightening bolt 12 passes through the hole of the pressure cover 10 and connects to the threaded hole at the top of the drive shaft 4. There are three circular keys 16. The circular keys 16 effectively restrict the radial rotation of the grinding disc 8 and the conical spacer 9. The above parts are fixed together to form a complete sand mill mixing device.

[0029] like Figure 1 and Figure 2As shown, the power system consisting of frame 1, variable frequency motor 2, transmission belt device 3, transmission shaft 4, and bearing housing 5 can stably and efficiently transfer the mechanical power output by variable frequency motor 2 to transmission shaft 4 through transmission belt device 3, thereby giving transmission shaft 4 the power to rotate around its axis. By adjusting the operating frequency of variable frequency motor 2, transmission shaft 4 can obtain different rotational speeds, which can meet the different speed requirements of various materials at different grinding stages. The stirring device consisting of grinding disc 8, conical spacer 9, rotor 11, and spacer seal rotates with transmission shaft 4. Grinding disc 8 and conical spacer 9 are arranged alternately to obtain multiple relatively independent spaces. Spacer seal ring 15 is filled and installed between them to seal the assembly gap, ensuring that the slurry does not penetrate into the interior during sand mill grinding. Circular key 16 restricts the radial rotation of other components. Bearing housing 5, grinding cylinder 6, and end cover 1 3. A sealed grinding chamber is constructed. After the slurry to be processed enters the grinding chamber, it is stirred by the stirring device along with the grinding media. Under the stirring of the grinding disc 8, the grinding media continuously collides with the inner wall of the grinding disc 8, the conical sleeve 9, and the grinding cylinder 6. The intense mechanical stirring and collision cause a huge speed difference and collision between the grinding media and the material particles, thereby forming a strong shear force, collision force, and friction force, achieving efficient and fine grinding of the material particles in the slurry. The conical design of the conical sleeve 9 (i.e., the cross-section of the conical sleeve 9 is V-shaped) gives it multiple advantages compared with the traditional cylindrical and square sleeves. For example, it has a larger contact area and collision angle, which makes the distribution of the grinding media more uniform in a local area, and the collision and movement more intense, improving the grinding efficiency, the consistency of the material particle size, and the fluidity of the slurry. At the same time, the resistance generated is much smaller than that of the square sleeve, and the energy consumption is greatly reduced.

[0030] like Figures 4 to 6 As shown, through comprehensive analysis of numerous experimental results, it was finally determined that the intersection point A of the perpendicular bisector of the hypotenuse of the tapered sleeve 9 and the grinding disk 8 should be located near the vertex of the near-end side of the grinding disk 8. Simultaneously, the length X of the tapered sleeve and the dimension Y from the midpoint of its single-sided tapering to the outermost edge of the grinding disk 8 should be approximately equal. When the area enclosed by X and Y is closer to a square, the dispersion grinding effect and efficiency of the sand mill reach a superior state.

[0031] This invention, through the special structure of the conical spacer, significantly optimizes the distribution of material and media within the grinding chamber during material processing, resulting in a more concentrated particle size distribution and a marked improvement in finished product quality. Its unique shape not only effectively increases the collision frequency and density of the grinding media at the same power level, generating stronger shearing force and more intense turbulence, but also imparts greater fluidity and mixing to the slurry, ensuring more uniform and residue-free contact between the grinding media and the slurry. Under the same operating conditions, it significantly reduces the unit energy consumption for material grinding, simultaneously improving dispersion grinding efficiency and product quality, and significantly reducing the risk of equipment blockage. Furthermore, the conical surface provides a larger contact area, enhancing heat dissipation performance, which is particularly advantageous when processing heat-sensitive materials, effectively preventing excessive local temperature rise and avoiding changes in material properties. Moreover, this invention has a reasonable structural design, simple manufacturing process, and is fully interchangeable with existing spacers.

[0032] The contents not described in detail in this specification are existing technologies known to those skilled in the art. The standard parts used can be purchased from the market, and the irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the existing technology. The machinery, parts and equipment adopt conventional models in the existing technology, and the circuit connection adopts conventional connection methods in the existing technology, which will not be described in detail here.

[0033] This utility model is not limited to the above-described embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of this utility model shall be considered equivalent substitutions and shall be included within the protection scope of this utility model.

Claims

1. A novel grinding disc-assisted grinding device for a sand mill, comprising a frame (1), characterized in that: A variable frequency motor (2) is fixedly installed inside the frame (1). A bearing seat (5) is fixedly installed on the top of the frame (1). A drive shaft (4) is fixedly installed on the bearing seat (5). The variable frequency motor (2) and the drive shaft (4) are connected by a drive belt device (3). The drive belt device (3) transmits the power of the variable frequency motor (2) to the drive shaft (4) and drives the drive shaft (4) to rotate. A grinding cylinder (7) is fixedly installed on the bearing seat (5) by a grinding cylinder fixing bolt (6). The other end of the grinding cylinder (7) is installed by an end cap. The end cap (13) is fixed by the fixing bolt (14). The bearing seat (5), grinding cylinder (7) and end cap (13) form a closed grinding chamber. The grinding chamber is provided with a grinding disc (8), a conical sleeve (9) and a rotor (11). The conical sleeve (9) is a sleeve with a tapered structure. The grinding disc (8) and the conical sleeve (9) are mounted on the drive shaft (4). The rotor (11) is mounted at the farthest end of the drive shaft (4). The stirring device composed of the grinding disc (8), the conical sleeve (9) and the rotor (11) rotates with the drive shaft (4).

2. The novel grinding disc-assisted grinding device for a sand mill as described in claim 1, characterized in that: The drive shaft (4) has grooves evenly distributed along its circumference. A round key (16) is installed in the groove of the drive shaft (4). The grinding disc (8) and the conical spacer (9) are aligned with the round key (16) and installed on the drive shaft (4). Spacer sealing rings (15) are installed at both ends of the conical spacer (9).

3. The novel grinding disc-assisted grinding device for a sand mill as described in claim 2, characterized in that: The rotor (11) is installed on the outside of the outermost grinding disc (8). A pressure cap (10) is installed in the recessed area inside the rotor (11). The lifting bolt (12) passes through the pressure cap (10) and presses and fixes the grinding disc (8), the conical spacer (9), the pressure cap (10), the rotor (11) and the spacer sealing ring (15) together through the threaded hole at the top of the drive shaft (4).

4. The novel grinding disc-assisted grinding device for a sand mill as described in claim 2, characterized in that: The grinding disc (8) and the conical spacer (9) are arranged and installed at intervals. The spacer sealing ring (15) is filled and installed in the sealed assembly gap between the grinding disc (8) and the conical spacer (9). The grinding disc (8), the spacer sealing ring (15), the conical spacer (9) and the spacer sealing ring (15) are arranged and fixed on the drive shaft (4) in sequence.

5. The novel grinding disc-assisted grinding device for a sand mill as described in any one of claims 1 to 4, characterized in that: The tapered spacer (9) has a V-shaped cross section, and the intersection point A of the perpendicular bisector of the hypotenuse of the tapered spacer (9) and the grinding disk (8) is located at the apex of the near-end side of the grinding disk (8).

6. The novel grinding disc-assisted grinding device for a sand mill as described in claim 5, characterized in that: The length X of the conical spacer (9) is equal to the dimension Y from the midpoint of its single-sided taper to the outermost edge of the grinding disc (8).

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