A stirring ball mill equipped with a support system for cooling the grinding container.

Abstract

This design allows for more efficient heat dissipation from the grinding container without omitting the support sleeve for the grinding container pipe. [Solution] A stirring ball mill comprising a grinding container which is at least mainly configured as a grinding container pipe and in which a stirring shaft and grinding elements circulated by the stirring shaft rotate inside, and a heat dissipation system which dissipates heat from the grinding container pipe and is formed by the grinding container pipe and a sleeve that surrounds the outer circumference of the grinding container pipe, and guides a cooling medium between the grinding container pipe and the sleeve, wherein the sleeve is press-fitted into the grinding container pipe, and the grinding container pipe and / or sleeve have grooves which, individually or in cooperation with each other, form a cooling medium channel capable of guiding a cooling medium between the sleeve and the grinding container pipe.

Description

Technical Field

[0001] The present invention relates to a stirring ball mill provided with a cooling support system for a grinding container according to the upper concept part of claim 1 and a corresponding system according to the upper concept part of claim 12.

Background Art

[0002] Conventional stirring ball mills include a vertically or horizontally arranged grinding container as a substantial component. This grinding container is mainly filled with grinding elements made of a hard and wear-resistant material such as steel, glass, or ceramic. The stirrer mainly stirs the grinding elements in the grinding container vigorously. The grinding material is mainly continuously pumped into the grinding container as a grinding material suspension, whereby the solid grinding material collides with the grinding elements in the grinding material suspension, and the grinding material is ground by the impact force and shear force.

[0003] The corresponding grinding container mainly consists of a pipe (so-called grinding container pipe) in most cases, which is held by two flange rings and is preferably sealed. Due to the movement of the grinding elements and the above-mentioned impact force and shear force, the grinding material and the grinding elements collide with the inner peripheral surface of the grinding container pipe. Therefore, the grinding container pipe is particularly exposed to strong wear from the grinding elements. Therefore, silicon ceramic that meets the required wear resistance requirements is mainly used as the material of the grinding container pipe. Different from many conventional ceramics, this silicon ceramic has high thermal conductivity. Therefore, it is possible to cool the grinding container through the outer peripheral jacket surface of the grinding container pipe and maintain the grinding container at a desired temperature.

[0004] The agitated ball mill 5 shown in Figure 5 by the applicant is a clear example of an agitated ball mill and forms the basis of the present invention. Figure 5 clearly shows the grinding container 2 and the agitated shaft that rotates inside it to circulate the grinding elements. Similarly, a jacket container provided in this agitated ball mill, which surrounds the grinding container 2 at a distance, is also clearly shown. In this way, an annular space formed (adjacent in the radial direction to the outer jacket surface of the grinding container pipe) can be brought into direct contact with a cooling medium, preferably cooling water. In this case, the prior art often uses a cooling mat with a rubber lip that guides the cooling medium in a spiral. These cooling mats are often made of plastic such as PVC and are placed on the outer circumference of the grinding container pipe to dissipate heat. However, in grinding processes that generate a very large amount of heat, such as cocoa, current plastic cooling mats reach their thermal limits.

[0005] In addition to sufficient heat dissipation, further important aspects must be considered in the design of grinding vessel pipes. Under no circumstances should the grinding vessel pipes be damaged, or, if damaged, prevent even extremely small grinding elements from reaching the cooling medium circuit. Damage to grinding vessel pipes is influenced by many factors, including the weight and dimensions of the grinding vessel pipes or grinding suspension, the pressure in the grinding chamber, the distribution of grinding elements, and / or pressure surges. To prevent damage to grinding vessel pipes, it is known that a sleeve, mainly made of aluminum, is press-fitted onto the outer circumference of the grinding vessel pipe. This sleeve prevents the cooling medium from directly contacting the grinding vessel pipe and further increases the strength of the grinding vessel pipe through support. Since the outside of the grinding vessel pipe is polished, this does not add any extra manufacturing effort to the grinding vessel pipe. In many cases, the sleeve is press-fitted onto the grinding vessel pipe. The cooling mat mentioned above can then be attached to the outer circumference of the sleeve.

[0006] However, the press-fitting method of sleeves, which has already been considered, has the drawback of significantly reducing the heat dissipation effect through the crushing container pipe.

[0007] This is because even metals with high thermal conductivity, such as aluminum, have significantly lower thermal conductivity compared to the special ceramics commonly used in grinding containers. Furthermore, when a sleeve is pressed into the support pipe, the wall thickness through which heat must be conducted increases. [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] Therefore, the objective of the present invention is to make heat dissipation from the grinding container more efficient without omitting the support sleeve for the grinding container pipe. [Means for solving the problem]

[0009] According to the present invention, this problem is solved as described below.

[0010] The present invention proposes a stirring ball mill comprising a metal container, which is mainly composed of a grinding material pipe, and inside which a stirring shaft and grinding elements circulated by the stirring shaft rotate. This stirring ball mill is equipped with a system for dissipating heat from the grinding container.

[0011] In its broadest sense, the present invention is characterized in that the system is formed by a sleeve that surrounds the outer circumference of the grinding container pipe and functions as a cooling medium guide, the sleeve being press-fitted into the grinding container pipe and having grooves or channels that participate in the cooling medium guide.

[0012] In a preferred, narrower sense, the present invention is characterized in that the system is formed by a grinding vessel pipe and a sleeve surrounding the outer circumference of the grinding vessel pipe, and is designed so that a cooling medium is guided between the sleeve and the grinding vessel pipe. The present invention is characterized in that the sleeve is press-fitted into the grinding vessel pipe, and the grinding vessel pipe and / or sleeve have grooves, which, individually or in cooperation with each other, form a cooling medium channel capable of guiding a cooling medium between the sleeve and the grinding vessel pipe.

[0013] Press-fitting the sleeve into the grinding container pipe means press-fitting the sleeve into the grinding container pipe. This press-fit allows a significant force to be transmitted in the longitudinal direction of the pipe from the grinding container pipe to the sleeve, and vice versa, because the inner diameter of the sleeve in its unassembled state is smaller than the outer diameter of the grinding container pipe, and therefore, after assembly, the sleeve and the grinding container pipe are press-fitted together, mainly or substantially across their entire contact surface. Press-fitting can be performed by using a press to press the sleeve into the grinding container tube, or preferably by thermal shrinkage.

[0014] In the narrow sense of the present invention, when a special ceramic is used in the grinding container pipe, the special ceramic, which has high thermal conductivity, comes into direct contact with the cooling medium, allowing heat to be dissipated to the cooling medium particularly well. In any case, the heat to be dissipated does not need to pass through a support sleeve before being transferred to the cooling medium. Both of these factors significantly reduce the thermal load on the grinding container pipe and its contents. In this case, the latter is extremely important, for example, when grinding heat-sensitive grinding materials (e.g., chocolate or cocoa beans) that generate high friction, with the high driving force required for this purpose.

[0015] Thus, existing grinding container pipes and / or existing sleeves can generally be used as internal cooling medium guides without attaching additional components to the system. This contributes to simplifying the overall system, reduces assembly effort, and saves radial installation space in many situations.

[0016] As described above, the cooling medium is preferably guided between the grinding vessel pipe and the sleeve. One option for this is that the grinding vessel pipe and the sleeve have grooves in which they cooperate, and these grooves together form a cooling medium channel. Such a design is particularly chosen when the grinding vessel pipe is not subjected to extreme mechanical stress and therefore the notch effect of the grooves does not have any effect. In this case, it is especially important to ensure the maximum possible direct contact surface between the special ceramic having excellent thermal conductivity and the cooling medium. In another option, the inner surface of the sleeve, and therefore the side facing the grinding vessel pipe, has grooves, and the smooth grinding vessel pipe without grooves forms a closed cooling channel. This makes it possible to form a cooling channel without compromising the strength of the grinding vessel pipe at all.

[0017] In both cases, the sleeve, which is press-fitted into the grinding container pipe via the web between the grooves, provides additional support to the grinding container pipe in both cases, thereby achieving high strength and stability with a thinner material thickness. This further improves cooling performance and reduces the risk of damage to the grinding container pipe.

[0018] In a preferred embodiment, the grooves of the grinding container pipe and / or sleeve have a concave, preferably semicircular, inner cross-section. Thus, the groove depth is preferably uniform across the entire surface. This contributes, on the one hand, to the manufacturability of the part, and on the other hand, ensures good guidance of the cooling medium in the thus formed cooling medium channel without areas where the cooling medium flow is less or almost nonexistent.

[0019] Furthermore, it is particularly preferable that the grooves rotate helically on the circumferential surface. This results in minimal circulation of the cooling medium, thus eliminating thermally stressed "dead regions" and enabling rotational circulation that allows the cooling medium to reach the entire surface more easily.

[0020] In a further conceivable embodiment, the grinding vessel pipe is composed of multiple pipes surrounding each other. In this case, at least two pipes, namely grinding vessel pipes generally made of special ceramic and smooth support pipes made of aluminum, are press-fitted together. A sleeve is press-fitted to the outside of the support pipe. In such a design, the cooling effect is reduced, but it is ensured that even if a crack occurs in the grinding vessel pipe, the cooling water will not reach the grinding vessel, nor will the grinding elements reach the cooling water circuit.

[0021] In a further conceivable embodiment, the sleeve has a groove on its outer circumference, and the grinding container pipe does not have a groove. In this case, the cooling channel is located away from the grinding container pipe, but due to the high thermal conductivity of the material, sufficient cooling capacity for heat dissipation can be obtained in some cases. A major advantage of such modifications is that even if a crack or break occurs in the grinding container pipe, the cooling medium will not leak into the grinding container, eliminating the need for complex cleaning operations, and conversely, the leakage of grinding elements into the cooling medium branch or circuit can also be preferably prevented.

[0022] The sleeve is particularly preferable if it is made of at least a large portion of aluminum or an aluminum alloy. Aluminum has excellent corrosion resistance and durability, and is especially suitable for heat dissipation from the inner pipe because it has high thermal conductivity.

[0023] Furthermore, the grinding container pipe is particularly preferable if it is made of ceramic, preferably silicon carbide ceramic, at least for the majority of its composition. Silicon carbide ceramic is the hardest ceramic material, while being extremely lightweight, and possesses low thermal expansion, excellent thermal conductivity, and excellent resistance to acids and alkalis.

[0024] In a preferred further embodiment, the sleeve is shrink-fitted onto the grinding container pipe. For this purpose, the sleeve is preferably first heated (e.g., in an oven) and expanded to such an extent that it can be inserted into the grinding container pipe. Thereafter, press-fitting is achieved by cooling the sleeve. The effective inner diameter of the sleeve is selected to be larger than the outer diameter of the grinding container pipe at a temperature that the sleeve material can withstand without damage to the structure and smaller than the outer diameter of the grinding container pipe at room temperature.

[0025] Further operating modes, advantages, and design options will become apparent from the description of the exemplary embodiments based on the drawings.

Brief Description of the Drawings

[0026] [Figure 1] It is a three-dimensional cross-sectional view showing a preferred exemplary embodiment of the heat dissipation system. [Figure 2] It is a side cross-sectional view showing the preferred exemplary embodiment in FIG. 1. [Figure 3] In a preferred exemplary embodiment, it is a side view showing a grinding container pipe having grooves. [Figure 4] In a preferred exemplary embodiment, it is a side cross-sectional view showing a sleeve having grooves. [Figure 5] It is an explanatory view showing a stirring ball mill known in the prior art which is also the basis of the present invention.

Mode for Carrying Out the Invention

[0027] The stirring ball mill 5 shown as an exemplary embodiment herein can be configured as shown in FIG. 5, but according to the present invention, only the peripheral portion of the outer periphery in the grinding container pipe 2 is designed differently. That is, it is different when the teachings shown in FIGS. 1 to 4 are applied to the design of FIG. 5.

[0028] For clarity, Figures 1 to 4 show a preferred exemplary embodiment of the heat dissipation (heat dissipation) system 1 from the grinding container pipe 2, in which the grinding container pipe 2 and the sleeve 3 pressed into the grinding container pipe 2 have grooves.

[0029] The outer circumferential surface of the illustrated grinding container pipe 2 has a spirally rotating groove 2a (see Figure 3). The inner circumferential surface of the sleeve 3 has a spirally rotating groove 3a (see Figure 4). The grooves 2a and 3a are designed and positioned to form a spirally rotating cooling medium channel 4 together when the grinding container pipe 2 and the sleeve 3 are pressed into place as predetermined (see Figures 1 and 2). In this case, the grooves 2a and 3a preferably have a substantially semicircular cross-section. After the sleeve 3 and the grinding container pipe 2 are pressed into place, the groove 3a of the sleeve 3 and the groove 2a of the grinding container pipe 2 preferably complement each other, thereby forming a spirally rotating cooling medium channel 4 having a substantially circular cross-section, through which the cooling medium can flow. For this purpose, the groove 3a of the sleeve 3 and the groove 2a of the grinding container pipe 2 must be adapted to each other in terms of positioning, diameter, and spiral shape, thereby having a circular cross-section and being able to complement each other as a rotating hollow coil.

[0030] It should be noted here that while System 1 shown in the illustration is preferably used in conjunction with a stirring ball mill 5, it can also be used with other types of mills and machines that require heat dissipation from an inner container.

[0031] The inner container or grinding container pipe 2 preferably has a cylindrical shape, but other shapes are also conceivable.

[0032] The grooves 2a and 3a preferably have a semicircular cross-section, but other shapes are also conceivable.

[0033] Generally speaking, the spiral grooves for guiding the cooling medium enable extremely uniform cooling without dead water zones.

[0034] Generally speaking, it is important that each web, or substantially each web, located between two directly adjacent grooves, press-fits radially with its corresponding mating part. Despite the formation of the cooling medium guide grooves, a significant support effect is obtained between the sleeve and the outer surface of the grinding vessel pipe, which is also due to the fact that the stronger webs separated by the grooves are stabilized like helical springs, preferably especially due to the helical shape of the grooves. Generally speaking, expansion and / or resistance measurements can be performed on the sleeve, which allows for the detection of cracks or breakage in the grinding vessel pipe before the sleeve fails due to excessive stress in the event of cracking or breakage. [Explanation of Symbols]

[0035] 1 System 2. Grinding container pipe 2a Grooves in the crushing container pipe 3 sleeves 3a Sleeve groove 4 Cooling medium channels 5. Mixing ball mill

Claims

1. A grinding container comprising at least primarily a grinding container pipe (2), in which a stirring shaft and grinding elements circulated by the stirring shaft rotate, A heat dissipation system (1) is formed by or with the involvement of a sleeve (3) that dissipates heat from the grinding container pipe (2), surrounds the outer circumference of the grinding container pipe, and functions as a guide for a cooling medium, In a stirring ball mill (5) equipped with, The stirring ball mill is characterized in that the sleeve (3) is press-fitted into the grinding container pipe (2) and has grooves or channels that participate in guiding the cooling medium.

2. Preferably, the stirring ball mill (5) described in claim 1, A grinding container comprising at least primarily a grinding container pipe (2), in which a stirring shaft and grinding elements circulated by the stirring shaft rotate, A heat dissipation system (1) is formed by the grinding container pipe (2) and the sleeve (3) surrounding the outer circumference of the grinding container pipe (2), and the grinding container pipe (2) and the sleeve (3) guide a cooling medium between them. In a stirring ball mill (5) equipped with, A stirring ball mill characterized in that the sleeve (3) is press-fitted into the grinding container pipe (2), the grinding container pipe (2) and / or the sleeve (3) have grooves (2a, 3a), and the groove (3a) of the sleeve, either alone or in cooperation with the groove (2a) of the grinding container pipe, forms a cooling medium channel (4) between the sleeve (3) and the grinding container pipe (2) that can guide a cooling medium.

3. A stirring ball mill (5) according to claim 1, characterized in that the grooves (2a, 3a) are concave and preferably have a semicircular inner cross-section.

4. A stirring ball mill (5) according to any one of claims 1 to 3, characterized in that the grooves (2a, 3a) rotate spirally on the circumferential surface.

5. A stirring ball mill (5) according to any one of claims 1 to 4, wherein the grinding container pipe (2) has a groove (2a) on its outer circumference, and the groove (2a) cooperates with the groove (3a) on the inner circumference of the sleeve (3a) to form, preferably a cooling medium channel (4) having a circular cross-section and rotating in a spiral manner.

6. A stirring ball mill (5) according to any one of claims 1 to 5, characterized in that the grinding container pipe (2) is composed of a plurality of pipes surrounding each other.

7. A stirring ball mill (5) according to any one of claims 1 to 6, characterized in that the sleeve (3) has a groove (3a) on its inner circumferential surface, and the grinding container pipe (2) does not have a groove.

8. A stirring ball mill (5) according to any one of claims 1 to 7, wherein the sleeve (3) has a groove (3a) on its outer surface, and the grinding container pipe (2) does not have a groove.

9. A stirring ball mill (5) according to any one of claims 1 to 8, wherein the sleeve (3) is made of at least a large portion of aluminum or an aluminum alloy.

10. A stirring ball mill (5) according to any one of claims 1 to 9, characterized in that the grinding container pipe (2) is made of at least a large portion of ceramic, preferably silicon carbide ceramic.

11. A stirring ball mill (5) according to any one of claims 1 to 10, characterized in that the sleeve (3) is shrink-fitted to the grinding container pipe (2).

12. A stirring ball mill (5) according to any one of claims 1 to 11, characterized in that the outer diameter of the grinding container pipe (2) is larger than the inner diameter of the sleeve (3) to such an extent that the press-fit between the sleeve (3) and the grinding container pipe (2) does not release even when the maximum allowable grinding container temperature exceeds 20 percent.

13. A system (1) for a stirring ball mill (5), wherein the system (1) comprises a grinding container pipe (2) and a sleeve (3), and is designed according to any one of claims 1 to 12 relating to the system (1).

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