Apparatus for comminuting of raw material and use of a cooling housing in the apparatus

Abstract

The invention relates to a vibrating disc milling device (10) for comminuting feed material (M1), comprising: a milling housing (11); a milling system (13) which is arranged in the milling housing in an oscillating manner and comprises a milling chamber (13.1); wherein the vibrating disc milling device (10) has a cooling housing (17) which is arranged within the milling housing and borders or encloses at least some sections of the milling system or at least the milling chamber, and the cooling housing defines at least one flow path (P2), which runs along the milling system at least in some sections, for coolant (M2), in particular for gaseous coolant, thus also allowing improved operating conditions. The invention additionally relates to the use of a cooling housing for cooling the milling system of the vibrating disc mill.

Description

TECHNICAL AREA

[0001] The invention relates to a device for comminuting feed material in a disc mill. Furthermore, the invention relates to the use of components for cooling a grinding system of the disc mill. BACKGROUND

[0002] Disc vibratory mills are used for the fine comminution of solids, especially for the purpose of providing the comminuted or ground solids for material analysis (for example, X-ray fluorescence analysis (XRF), atomic absorption spectroscopy (AAS), near-infrared spectroscopy (NIR), inductively coupled plasma mass spectrometry (ICP-MS)).

[0003] Disc mills typically feature a grinding mechanism located within a housing between the material feed and discharge points. This grinding mechanism includes, for example, a pot with a lid and grinding media, which can be designed as stones, discs, lenses, or rings.

[0004] Disc vibratory mills can grind solids based on pressure, impact and / or friction.

[0005] Disc vibratory mills generate a rotary oscillation of the grinding chamber's center of gravity without rotating the chamber itself. This oscillation can be achieved through a spring-loaded bearing with an unbalanced mass drive or through eccentric shafts. Mills with unbalanced masses have a variable eccentric radius due to the speed-dependent spring deflection; mills with eccentric shafts have a structurally constant radius. This oscillation causes the grinding tools to roll along the circumference of the grinding vessel. Alternative vibration methods result in deliberately chaotic movements of the grinding tools and random impact loads between the tools and between the tools and the grinding vessel.In a disc mill, the input material is crushed at the side wall of the grinding chamber by means of a rolling motion of the millstone; below the millstone towards the bottom of the grinding chamber, crushing takes place by a rotary-push motion.

[0006] Grinding with disc vibratory mills has so far proven to be an inefficient and difficult-to-precise grinding method in many applications. Friction losses, in particular, pose a risk of individual mill components overheating, leading to temperature inhomogeneities. Significant temperature differences negatively impact the grinding result. Adverse effects, such as inhomogeneous grinding results (high inhomogeneity within the ground batch), are often unavoidable. This is especially problematic when the ground batch is intended for material analysis, which will unfortunately also become less accurate. Finally, temperature inhomogeneities also negatively affect the shrinkage of the grinding vessel, which may be necessary depending on the material being processed. To illustrate this more clearly, the typical design of disc vibratory mills is briefly explained below.

[0007] Shrinking the grinding vessel into the grinding chamber is usually necessary when the component is made of tungsten carbide-cobalt hard metal. This material is very wear-resistant, but experience has shown that it can only be reliably secured by clamping, gluing, or soldering. In contrast, steel grinding vessels have too short a service life for continuous use in many applications. Especially when the disc mill is to initiate the oscillating motion of the grinding vessel via eccentric shafts, rolling bearings typically guide or support the grinding vessel on these shafts.

[0008] Typically, three of these shafts are arranged around the circumference of the mill. Because these shafts are usually held in the base plate of the grinding system and additionally connected via the grinding vessel, material stresses can occur due to improper use or, for example, large temperature differences. This is one of the reasons why cooling the components is advantageous.

[0009] Currently, disc vibratory mills are typically cooled using fans located inside the mill housing. However, the cooling effect is often insufficient. Therefore, there is interest in effective cooling methods for disc vibratory mill components, particularly to minimize temperature differences.

[0010] DE 43 43 742 A1 describes a disc vibratory mill with a grinding vessel with an air-cooled outer cooling jacket, through which air flows from bottom to top.

[0011] EP 2 061 600 B1 and EP 2 063 992 B1 each describe a vibrating mill with a housing ring in which cooling grooves are provided in such a way that the housing can be cooled by means of a circulating cooling medium.

[0012] DE 2 063 812 A describes a grinding process (in particular a horizontally arranged ball vibrating mill) which differs technically from the grinding process of disc vibrating mills, which is also reflected in the constructive design of the mill.

[0013] A grinding device with a frame is known from US 2019 / 111438 A1.

[0014] Prior devices enable, in particular, the cooling of the grinding chamber or grinding vessel by means of liquid cooling. There is interest in further measures that would allow for advantageous temperature control of the mill. DESCRIPTION OF THE INVENTION

[0015] The object of the invention is to provide a disc vibratory mill with the features described above, in which cooling can be optimized, in particular with regard to minimizing the previously described adverse effects of temperature differences within the mill, especially in disc vibratory mills with eccentric shaft drive, and also with regard to stresses between the individual components.

[0016] This problem is solved by a device according to the independent device claim and by a use according to the dependent use claim. Advantageous embodiments are listed in the dependent claims.

[0017] The disc mill device disclosed herein is a disc mill device configured for comminution of feed material, in particular feed material with a particle size of less than 20 mm, and in particular configured for grinding the feed material to particle sizes of less than 75 µm or less than 10 µm, comprising: a mill housing which defines a system boundary from the environment to a material feed and to a material discharge of the disc mill device; a grinding system arranged in the mill housing to be oscillatively movable, comprising a grinding chamber and at least one grinding stone movably arranged in the grinding chamber, wherein the grinding system is arranged on the material flow path between the material feed and the material discharge;The disc mill device comprises an internal cooling housing arranged within the mill housing, which at least partially delimits or encloses the grinding system or at least the grinding chamber, and wherein the cooling housing defines at least one flow path for cooling medium, in particular for gaseous cooling medium (preferably air), running at least partially along the grinding system. This provides further possibilities for temperature control of the grinding system. In particular, the grinding chamber can be efficiently cooled by a very simple design measure, especially with minimal additional operating costs. The cooling housing can, for example, act as a box or enclosure, providing isolation from the environment, especially with a predefinable enclosed cooling volume, and air can be used as the cooling medium, so that a separate cooling medium circuit is not required.

[0018] The grinding system and the cooling housing are spaced apart, and the flow path for the cooling medium runs between the grinding system and the cooling housing. This offers several advantages over the prior art. Firstly, the cooling housing does not need to move with the grinding system; only the grinding system within the cooling housing moves during the grinding process. The cooling housing remains relatively stationary, apart from the vibrations that are transmitted to the entire device. Less moving mass means less energy loss and reduced wear. Secondly, the cooling medium comes into direct contact with the grinding system, reducing the required layer thickness for heat transfer. Additionally, the full-surface cooling results in more homogeneous temperature distribution.

[0019] The feed material preferably has a particle size of less than 20 mm. Particularly preferably, the particle size of the feed material is between 20 mm and 75 µm. The feed material is preferably ground to particle sizes of less than 75 µm, particularly preferably to particle sizes of less than 10 µm. The feed material is preferably ground to particle sizes of more than 0.5 µm, particularly preferably to particle sizes of more than 1 µm, and most preferably to particle sizes of more than 2 µm.

[0020] Particle size, as defined in the invention, is to be understood as the mean particle size, whereby larger and smaller particles are to be found with decreasing probability the further the size deviates from the mean size.

[0021] In other words, according to the invention, cooling of the grinding unit can be ensured by means of an additional enclosure through the circulation of a cooling medium around the grinding system, i.e., direct cooling of the grinding system or the moving, grinding components of the mill. The invention is based on the concept of enclosing or at least partially isolating the grinding system with regard to heat transfer by convection.

[0022] A distinction must be made between free convection and forced convection. In the case of free convection, the heat emitted by the grinding system warms the cooling medium to such an extent that its density decreases sufficiently to cause the cooling medium to rise, thus achieving a continuous flow of coolant past the grinding system. This design is particularly simple and incurs no additional operating costs. To achieve greater reliability, especially with regard to pressure and temperature fluctuations in the environment, such as those caused by weather, forced convection is advantageous. This is convection that is forced upon the cooling medium, for example by a fan, and reliably carries it past the grinding system in a continuous flow.The disadvantage is that the additional component increases investment, consumption and maintenance, but the cooling performance is more reliable.

[0023] Advantageously, the cooling housing is arranged or constructed in such a way that the grinding chamber can be temperature-controlled by cooling based on heat exchange through convection. Convective heat transfer in a predefined cooling volume also allows for comparatively variable control and temperature management, for example, based on the temperature and / or the flow rate (volume flow) of the cooling medium.

[0024] Guiding the cooling medium, in particular an air guide, around the grinding chamber can be ensured in particular by inlets and outlets of the cooling housing arranged at least approximately centrally with respect to the diameter of the grinding chamber.

[0025] It has been shown that the cooling according to the invention particularly promotes or even enables continuous use of the mill, especially with high input material turnover.

[0026] The inner housing (cooling housing) can extend around the components of the grinding chamber, especially with the longest possible flow path along the respective component, in the sense of a complete flow around the grinding chamber using cooling medium.

[0027] The inner housing is preferably designed to fit relatively closely, i.e., it is guided relatively tightly around the contour of the grinding mechanism or grinding system. In other words, the internal geometry or inner contour of the cooling housing is preferably designed to correspond to the outer contour of the grinding system or, specifically, the grinding chamber. The design according to the invention therefore enables effective cooling, particularly with minimized energy losses with regard to heat transfer or heat dissipation, thanks to forced convection along predefined flow paths or along predefined surface sections.

[0028] It has been shown that the cooling housing can advantageously be composed of individual segments or panels that are, for example, pivotally connected to one another in a single piece (gas-tight) or coupled to one another by individual segments using hinges or pivots. The cooling housing (inner housing) can, for example, be arranged to fit over the grinding chamber. The cooling housing does not have to be completely enclosed all around, but can, for example, have an open bottom, particularly with regard to flange mounting of the housing to a base plate, or with regard to an overlapping (overlapping) arrangement with the base plate in the vertical direction. Preferably, lateral gaps between the grinding unit and the housing are small or minimized, especially to allow the flow around the individual components along a movement path that is as precisely defined as possible.Optionally, gaps at the bottom and top of the cooling housing, i.e., distances between the housing wall and the components to be cooled, can also be adjusted for optimized flow. In particular, an internal collar can optionally be provided in the top of the cooling housing, especially with a guide designed to direct the cooling medium along the top of the grinding chamber for as long as possible. Alternatively, the flow path can be redundantly routed multiple times along the same contour.

[0029] The cooling housing preferably encloses the grinding unit closely, particularly to ensure effective use of the cooling medium. The cooling housing can be geometrically designed to correspond to the grinding chamber. Thanks to high speeds, large surface contact areas, and preferably also multiple deflections (turning points in the flow path), particularly effective cooling can be ensured.

[0030] The cooling medium, particularly air, can be directed onto the bottom of the grinding chamber from below, ensuring a direct flow for maximum heat transfer and / or maximum temperature difference without intervening components. The cooling medium can also be directed counter-currently, against the flow direction of the input material.

[0031] The cooling medium is discharged, in particular, centrally above the grinding chamber. In other words, the flow path for the cooling medium preferably follows one or more semicircular paths around the grinding chamber, each with a central starting and ending point. Axial fans can preferably be provided at the central starting and / or ending points.

[0032] Optionally, the cooling medium can be pre-cooled upstream of the grinding system, particularly when the mill is installed in especially warm environments. For this purpose, the device can include a cooling unit for pre-cooling the cooling medium, with the cooling unit being located outside the grinding chamber, preferably below it. For example, a temperature difference in the range of 5 K to 10 K [Kelvin] can already produce noticeable effects. In particular, a compromise between flow rate and cooling capacity, adjustable by means of a logic unit, can be set or controlled upstream of the grinding chamber.

[0033] The materials to be ground (feed material) can include, in particular, all conceivable dry mineral substances.

[0034] The material feed can be carried out, for example, with particles up to 10 mm [millimeters] in size. The ground product can then be milled down to, for example, less than 10 µm [micrometers].

[0035] The design according to the invention also offers advantages in terms of maintenance and cleaning.

[0036] The mill housing can also be formed, at least in part, by a support frame (frame structure) of the mill.

[0037] It has been shown that, thanks to the free flow of the cooling medium between the moving components, a comparatively large surface area can be cooled using the cooling method according to the invention, particularly air cooling, making the cooling particularly effective. In contrast, cooling using liquid, especially water, can only be achieved at fewer points and only in narrowly defined areas / sections. Spraying liquid cooling medium has also proven to be less advantageous or less efficient than the cooling method according to the invention and, particularly due to the associated technical effort, is not a viable alternative.

[0038] The base plate of the mill can also be called the base plate. This plate typically concentrates all forces from the grinding system, allowing any unbalanced residual forces to be transferred to the machine frame (support frame).

[0039] The mill's internal housing can be divided into removable / assemblable segments. This segmentation allows access to the grinding unit without requiring the components to be removed from the mill's frame / staff. This facilitates time-efficient replacement of the grinding tools. For example, the internal housing is divided into four wall elements, four ceiling segments, and two labyrinth lids.

[0040] Preferably, the inner housing is designed to fit very closely around the grinding system, particularly to ensure that the cooling medium (cooling air) directed upwards onto the grinding vessel can be guided closely around the mill components (cooling flow path at least approximately corresponding to the contour of the grinding system). The cooling medium is discharged, for example, via a central opening at the top of the inner housing, especially to ensure that the cooling medium is guided closely and true to the contour above the grinding system as well. This provides a good cooling effect. Furthermore, the pressure loss can be kept at a comparatively low level. Preferably, a labyrinth guide and / or at least an inner collar is provided in the lid. The labyrinth guide can optimize the flow path and / or the residence time of the cooling medium or, for example, serve for subsequent adjustment or fine-tuning of the flow path.Furthermore, sound insulation can also be provided by means of the labyrinth guide. Preferably, the inner housing has an internal soundproof lining, for example provided by a coating and / or foam material. This also provides the advantageous side effect of minimizing the mill's noise emission by means of the inner housing. Thanks to optimized cooling, any negative effects of any linings with regard to heat transfer can be minimized.

[0041] Grinding vessels typically have a cylindrical wall and a flat lid and base. The inner housing can be geometrically designed to correspond to this contour, thereby defining a geometrically corresponding cooling medium flow path.

[0042] The following types of millstones are usually practical: cylindrical millstone; ring-shaped millstone additionally with a cylindrical millstone; lenticular millstone.

[0043] For example, the following operating mode can be described: Two fans with a combined flow rate of approximately 800 to 1,500 m³ / h (cubic meters per hour) cool the grinding system at a load of five to fifteen grinding cycles per hour and with approximately 0.5 to 3 kg of feed material. The grinder and the fans can, for example, operate continuously. Air is used as the cooling medium, particularly for cost reasons. The ambient temperature (especially room temperature) can be specified as the suitable inlet temperature, so that inlet cooling of the cooling medium is not necessary. The outlet temperature is then approximately 10 °C (degrees Celsius) or 10 K (Kelvin) above the inlet temperature, i.e., for example, a temperature of 30 °C.

[0044] The arrangement according to the invention can also be described as a housing-within-a-housing arrangement, particularly since the inner housing can also fulfill a protective function. The housing-within-a-housing arrangement enables functional integration into the cooling housing, for example, with regard to sound insulation or improved protection against foreign objects.

[0045] Optionally, full sound insulation can be provided, especially in the area of ​​all inner surfaces or inner casing surfaces of the inner housing.

[0046] Optionally, at least one flow path for the cooling medium runs within the cooling housing that at least encloses or surrounds the grinding chamber. This also enables forced convection along the longest possible sections of the grinding chamber's outer surfaces.

[0047] Optionally, the at least one flow path for the cooling medium between the inlet and outlet of the cooling housing along the grinding chamber has at least two or at least three turning points. This allows, for example, retaining brackets, bearings, or counterweights—components of the grinding system through which heat dissipation can occur—to also be cooled by the flow. This also promotes at least indirect cooling of the grinding chamber.

[0048] For example, the cooling housing defines a circumferential cooling zone (enveloping cooling jacket) around the entire grinding chamber. Alternatively, the cooling housing defines a longitudinal cooling zone extending completely along the entire grinding chamber (cooling jacket oriented in the direction of material flow or against the direction of material flow). This enables comprehensive and effective heat exchange over a comparatively large area.

[0049] According to the invention, the cooling housing has an inlet and outlet for the cooling medium, each arranged at least approximately centrally within the housing. This allows for a simple design and also a very practical flow path. Thanks to the near-central arrangement, the cooling medium can be easily and homogeneously distributed across all heat exchange surfaces. A strictly central arrangement may be precluded by the installation of a discharge valve.

[0050] Optionally, the at least one flow path for the cooling medium within the cooling housing, which at least encloses the grinding chamber, can run vertically in one section or in opposite vertical directions in at least two sections. This type of flow reversal can also increase the residence time and optimize heat transfer. Depending on acceptable pressure losses, it may be more advantageous to guide the cooling medium along the grinding chamber in only one direction without vertical reversal.

[0051] A preferred routing of the cooling medium can be described as follows: The cooling medium flowing from below is divided radially and guided around the grinding chamber. Above the grinding chamber, the cooling medium, or rather the flow paths of the cooling medium, are recombined, and the cooling medium is preferably discharged from the cooling housing via a single outlet.

[0052] For example, the at least one flow path for cooling medium between the inlet and outlet of the cooling housing is divided into at least two flow path sections that run parallel at least partially, or it is divided into at least two flow path sections that run parallel at least partially in a radially arranged lateral section of the grinding chamber, wherein the at least two flow path sections are rejoined upstream of the outlet. This allows the cooling to be optimized.

[0053] According to one embodiment, the cooling housing has an inlet and an outlet, wherein a labyrinth guide and / or at least one inner collar is / are provided upstream of the outlet, in particular a labyrinth guide comprising at least two additional turning points of the flow path. This allows the course or geometry of the flow paths to be influenced by simple design measures. The forced convection can be optimized. The labyrinth guide can, for example, be designed with an internal guide for deflecting the flow paths, similar to a silencer.

[0054] According to one embodiment, the cooling housing has an inlet and an outlet, the inlet being designed to direct the cooling medium onto a bottom or base of the grinding chamber. This also allows for indirect (convective) cooling of components, through which heat can be conducted.

[0055] According to one embodiment, the inlet and outlet of the cooling housing are arranged opposite each other, in particular centrally or at least approximately centrally with respect to a diameter of the grinding chamber, and particularly opposite each other in the axial direction, wherein at least one fan is arranged in or on the flow path at the inlet and / or at the outlet. Optionally, several fans can be provided side by side, which together are preferably arranged at least approximately centrally with respect to the grinding chamber in the radial direction.

[0056] According to one embodiment, the grinding system has a base plate, the base plate serving as a support or bearing for at least one fan arranged in the flow path. This also results in further design advantages.

[0057] The disc mill device, for example, has a grinding drive which is held / fixed to a base plate of the grinding system. The grinding drive of the disc mill device can, for example, be arranged eccentrically with respect to the grinding chamber. The grinding drive of the disc mill device is coupled, for example, to at least one eccentrically arranged drive shaft, optionally to two or three eccentric drive shafts.

[0058] According to one embodiment, the cooling housing is designed as a five-sided, downward-opening housing shell or housing segment unit. The cooling housing can, for example, have a square, rectangular, or at least approximately circular base or cross-sectional contour. This allows for a simple housing design and easy integration into the mill's structural design. The cooling housing can be attached, for example, to tabs, projections, or supports of the mill housing or base plate, particularly to its underside.

[0059] The cooling housing can be connected to the base plate of the grinding system, for example, by means of a form-fit and / or force-fit connection, in particular by screws. The cooling housing, together with the base plate of the grinding system, can form a unit sealed off in all directions, in particular by the housing sealing off the grinding chamber at least in all horizontal directions and also from above. In other words, the base plate can fulfill a housing function by defining the bottom of the cooling housing (base plate as part of an internal housing, in particular for defining a cooling area or cooling jacket around the grinding chamber).

[0060] According to one embodiment, the cooling medium can be guided through the cooling housing either by negative pressure (suction flow) or by positive pressure (pressure flow). This opens up individual flow control options for the respective application, particularly with regard to optimized forced convection. Depending on the arrangement of fans, the geometry of the flow paths and the pressure conditions can be influenced.

[0061] According to one embodiment, at least one fan is arranged in the flow path to provide a flow rate in the range of 100 m³ / h to 2,000 m³ / h upstream and / or downstream of the grinding chamber. Optionally, the fan can also be controllable. This allows for an advantageously wide control range for forced convection.

[0062] For example, at least one fan with a flow rate of 200 to 600 m³ / h or 300 to 800 m³ / h is used. It has been shown that with effective flow of the cooling medium, good cooling effects can be achieved even at flow rates as low as 100 m³ / h. Particularly in continuous operation, a cooling capacity of over 1000 m³ / h can be especially advantageous, depending on the size of the mill.

[0063] The cooling housing can be positioned in a predefined, and in particular adjustable, relative position to the mill housing and / or to a base plate, especially by means of adjustable fastening means. This allows the isolation achieved by the cooling housing to be set or fine-tuned.

[0064] Optionally, the cooling housing can be positioned and fixed within the mill housing in such a way that the size and / or geometry of the gap, channel, or cooling jacket between the cooling housing and the grinding system is adjustable. This also allows for easy adjustment, for example, with regard to throughput, using spacers and / or screw connections accessible from the outside of the mill housing. Alternatively, the cooling housing can be positioned within the mill housing in such a way that the gap or channel between the cooling housing and the base plate of the disc mill assembly is minimal (or at most, extremely small). This further simplifies the integration of the cooling housing into standard mill designs.

[0065] According to one embodiment, the cooling housing is composed / constructed in several detachable / assemblable segments, in particular in at least three segments, especially in at least two side segments and at least one cover segment. This also facilitates a customizable design of the housing for a specific application. This also simplifies access to the grinding chamber without requiring the housing to be removed from the frame. The individual segments can be constructed, in particular, as surface elements or panels, and in particular, each must be completely flat / planar (flat surface on the outside or on both the outside and inside).

[0066] According to one embodiment, the cooling housing incorporates sound insulation, in particular a soundproof lining on the inside of the cooling housing. This also achieves the advantageous side effect of a mill with a pleasant or at least acceptable operating noise level.

[0067] This also facilitates continuous operation. Foam, especially heavy-duty foam, can be used as a soundproofing material. The thickness of the soundproofing material or lining typically ranges from 15 mm to 55 mm.

[0068] The aforementioned problem is also solved in particular by a disc vibratory mill device for comminuting feed material, especially feed material with a particle size of less than 20 mm, in particular configured for grinding the feed material to particle sizes of less than 75 µm or less than 10 µm, comprising: a mill housing which defines a system boundary from the environment to a material feed and to a material discharge of the disc vibratory mill device; a grinding system arranged in the mill housing to be oscillatively movable, comprising a grinding chamber and at least one grinding stone movably arranged in the grinding chamber, wherein the grinding system is arranged on the material flow path between the material feed and the material discharge;wherein the disc vibratory mill device has a cooling housing arranged within the mill housing, enclosing the grinding system or at least the grinding chamber, wherein the cooling housing defines at least one flow path for cooling medium, in particular for gaseous cooling medium (preferably air), which extends at least partially along the grinding system, wherein the cooling housing has an inlet and outlet for the cooling medium, each arranged at least approximately centrally in the cooling housing, wherein at least one fan is arranged in or on the flow path at the inlet and / or at the outlet, and wherein the cooling housing is composed / constructed in several removable / assemblable segments, in particular in at least three segments, in particular in at least two side segments and at least one cover segment. This design allows numerous advantages mentioned above to be realized.

[0069] The grinding system and the cooling housing are separated, and the flow path for the cooling medium runs between the grinding system and the cooling housing. This offers several advantages over the prior art. Firstly, the cooling housing does not need to move with the grinding system. Less moving mass means less energy loss and reduced wear. Secondly, the cooling medium comes into direct contact with the grinding system, reducing the layer thickness required for heat transfer. Additionally, the full-surface cooling results in more homogeneous temperature distribution.

[0070] The feed material preferably has a particle size of less than 20 mm. Particularly preferably, the particle size of the feed material is between 20 mm and 75 µm. The feed material is preferably ground to particle sizes of less than 75 µm, particularly preferably to particle sizes of less than 10 µm. The feed material is preferably ground to particle sizes of more than 0.5 µm, particularly preferably to particle sizes of more than 1 µm, and most preferably to particle sizes of more than 2 µm.

[0071] The aforementioned problem is also solved according to the invention by using an inner, internal cooling housing within a mill housing of a disc vibratory mill to define a cooling jacket that at least partially encloses a grinding chamber of the disc vibratory mill and to define at least one flow path for cooling medium, in particular for gaseous cooling medium (preferably air), running at least partially along the grinding chamber or the grinding system of the disc vibratory mill in a previously described disc vibratory mill device. This results in numerous advantages mentioned above. FIGURE DESCRIPTION

[0072] Further features and advantages of the invention will become apparent from the description of at least one embodiment with reference to drawings, as well as from the drawings themselves. These show Fig. 1 in perspective view of a disc vibratory mill device according to an embodiment; Figs. 2A, 2B, 2C each in perspective view details of a cooling housing for a disc vibratory mill device according to an embodiment; Figs. 3A, 3B each in perspective view the grinding system of a disc vibratory mill device according to an embodiment; Fig. 4 in cutaway side view of a cooling housing for a disc vibratory mill device according to an embodiment. DETAILED DESCRIPTION OF THE FIGURES

[0073] For reference symbols that are not explicitly described in relation to a single figure, reference is made to the other figures.

[0074] The Fig. 1 Figure 10 shows a disc vibratory mill device with a mill housing or housing frame 11, which is constructed from individual supports 11.1 (or profiles). Starting from a material feed point 12, the input material M1 is fed along a material flow path P1 through a grinding system 13 (in Fig. 1 (not shown) is directed and conveyed to a material discharge 19. The grinding system 13 is enclosed by a cooling housing 17, which isolates the grinding system 13 from the environment 1.

[0075] The Fig. 2A , 2B , 2C Figure 17 shows details of the inner housing 17, for example, a labyrinth guide or at least a collar 17.7. The housing is constructed in individual segments, which are preferably coupled or connected to each other in a fluid-tight manner. The outlet for the cooling medium is arranged at least approximately centrally, preferably exactly centrally.

[0076] The in Fig. 2A The housing 17 shown is divided into several segments 17a, 17b, 17.2, in particular side segments (lateral walls) 17a, 17b and at least one cover segment 17.2. A cover element, in particular a cover plate 17.8, can also be provided, either as a housing component or as an additional part. The cooling medium M2 can escape from the housing 17 via an outlet 17.9; here, the outlet 17.9 is arranged between the cover 17.2 and the cover plate 17.8. Form-fit and / or force-fit fastening means 18, 18.1 are provided at a lower edge of the housing 17, in particular screw holes and associated screws.

[0077] The Fig. 3A , 3B , 4 Figure 13 shows the grinding system 13 with the grinding chamber 13.1 and its underside or base 13.12, as well as the base plate 13.3. The grinding drive 14 is coupled to an eccentric shaft 14.1. The two other eccentric shafts rotate freely.

[0078] One or more flow paths P2 of the cooling medium enclose the grinding chamber 13.1, whereby the respective flow path P2 can also be split section by section into several flow path sections P2.1, which are then merged again.

[0079] The Fig. 3A , 3B Figure 15 further shows two fans 15, a base cover 16 and the inlet 17.1 for the cooling medium M2. The fans are arranged centrally at the inlet 17.1 and can be controlled and optionally regulated (for example with regard to the flow rate) by means of a control unit (not shown), particularly depending on the operating states of the drive 14.

[0080] Fig. 4 Figure 1 illustrates the structure of an arrangement according to the invention in the vertical and radial directions. The arrow M2z denotes a directed flow of the cooling medium. The cooling medium M2 flows (in a highly simplified description) radially outwards from the inlet 17.1 into a cooling jacket 17.5 or into a cooling cavity between the grinding system and the cooling housing, continues to flow at least approximately vertically therein, and flows radially back through a cooling area 17.3 above the grinding system into a central area past a collar 17.7 to the outlet 17.9.

[0081] The housing 17 has a soundproof lining 17.6 on its inner side. The housing 17 is fixed to tabs or projections on the frame 11.1 by means of fasteners 18.2 and can therefore optionally be mounted in a position adjustable relative to the frame.

[0082] A gap or area 21 is formed between the cooling housing 17 and the mill housing 11. A gap 22 exists between the cooling housing 17 and the base plate 13.3, which can be minimized.

[0083] Fig. 4 It also illustrates the radial direction r and the vertical direction z. Reference symbol list:

[0084] 1 Environment 10 Disc vibratory mill device 11 Mill housing or housing frame 11.1 Individual support or prop 12 Material feed 13 Grinding system 13.1 Grinding chamber 13.12 Underside or bottom of the grinding chamber 13.3 Base plate 14 Grinding drive 14.1 Drive shaft or eccentric shaft 15 Fan 16 Bottom cover 17 Cooling housing 17a, 17b Segment, in particular side segment (lateral wall) 17.1 Inlet 17.2 Segment, in particular cover (top wall) 17.3 Cooling area above the grinding system 17.5 Cooling jacket or cooling cavity between grinding system and cooling housing 17.6 Soundproofing lining 17.7 Labyrinth guide or collar 17.8 Cover element, in particular cover plate 17.9 Outlet 18; 18.1, 18.2Fastening means 19Material discharge 21Gap or area between cooling housing and mill housing 22Gap between cooling housing and base plate M1Insert material M2Cooling medium M2zDirected cooling medium or aligned cooling medium flow P1Material flow path P2Flow path of the cooling medium P2.1Flow path section rradial direction zvertial direction or longitudinal direction (axial direction).

Claims

1. A disc vibrating mill apparatus (10) designed for comminuting feed material (M1), in particular feed material (M1) with a particle size of less than 20 mm, in particular designed for grinding the feed material (M1) to particle sizes of less than 75 µm or less than 10 µm, comprising: - a mill housing (11) which defines a system boundary from the environment (1) to a material feed (12) and to a material discharge (19) of the disc vibrating mill apparatus (10); - a grinding system (13) arranged in the mill housing (11) so as to be capable of oscillatory movement, comprising a grinding chamber (13.1) and at least one grinding stone arranged movably within the grinding chamber (13.1), wherein the grinding system (13) is arranged on the material flow path (P1) between the material feed (12) and the material discharge (19); wherein the disc vibrating mill device (10) comprises a cooling housing (17) arranged within the mill housing (11) and at least partially delimiting or enclosing the grinding system (13) or at least the grinding chamber (13.1), wherein the cooling housing (17) defines at least one flow path (P2) for cooling medium (M2), in particular for gaseous cooling medium (M2), extending at least in sections along the grinding system (13), wherein the grinding system (13) and the cooling housing (17) are spaced apart, wherein the flow path (P2) for cooling medium (M2) extends between the grinding system (13) and the cooling housing (17), wherein the cooling housing (17) has an inlet (17.1) and an outlet (17.9) for the cooling medium (M2), each of which is arranged at least approximately centrally within the cooling housing (17).

2. Disc oscillating mill device (10) according to claim 1, wherein the cooling housing (17) is arranged or constructed ( ) such that the grinding chamber (13.1) can be tempered by cooling based on heat exchange via convection.

3. Disc vibrating mill device (10) according to one of the preceding claims, wherein a labyrinth guide (17.7) and / or at least one inner collar (17.7) is / are provided at the outlet (17.9) upstream of the outlet (17.9), a labyrinth guide (17.7) and / or at least one inner collar (17.7) is / are provided, in particular a labyrinth guide (17.7) comprising at least two additional turning points of the flow path (P2).

4. Disc oscillating mill device (10) according to one of the preceding claims, wherein the inlet (17.1) is arranged to direct the cooling medium (M2) onto an underside (13.12) or onto a base (13.12) of the grinding chamber (13.1); and / or wherein the inlet (17.1) and the outlet (17.9) of the cooling housing (17) are arranged opposite one another, in particular centrally or at least approximately centrally with respect to a diameter of the grinding chamber (13.1), in particular opposite one another in the axial direction (z), wherein at least one fan (15) is arranged in or on the flow path (P2) at the inlet (17.1) and / or at the outlet (17.9).

5. Disc oscillating mill device (10) according to one of the preceding claims, wherein the grinding system (13) comprises a base plate (13.3), wherein the base plate (13.3) forms a support or bearing for at least one fan (15) arranged in the flow path (P2); and / or wherein the disc vibrating mill device (10) comprises a non- e grinding drive (14) which is mounted on the base plate (13.3) of the grinding system (13).

6. Disc vibrating mill device (10) according to one of the preceding claims, wherein the cooling housing (17) is designed as a five-sided housing shell or housing segment unit open at the bottom; and / or wherein the cooling housing (17) has a quadrangular, rectangular, square or at least approximately circular base area or cross-sectional contour.

7. Disc vibrating mill device (10) according to one of the preceding claims, wherein the cooling medium (M2) can be passed through the cooling housing (17) either by negative pressure or by positive pressure; and / or wherein at least one fan (15) is arranged in the flow path (P2) upstream and / or downstream of the grinding chamber (13.1) to provide a flow rate in the range of 100 m3 / h to 2,000 m3 / h.

8. Disc vibrating mill apparatus (10) according to one of the preceding claims, wherein the cooling housing (17) can be positioned in a predefined, in particular adjustable, relative position relative to the mill housing (11) and / or relative to a base plate (13.3), in particular by means of adjustable fastening means (18, 18.1, 18.2).

9. Disc vibrating mill device (10) according to one of the preceding claims, wherein the cooling housing (17) is constructed in a plurality of detachable / mountable segments (17a, 17b, 17.2), in particular at least three e segments, in particular at least two side segments (17a, 17b) and at least one cover segment (17.2); and / or wherein the cooling housing (17) comprises at least one detachable segment which is designed to be flat on the outside or flat on both the outside and inside.

10. A disc vibrating mill device (10) according to one of the preceding claims, wherein the cooling housing (17) comprises sound insulation means (17.6), in particular a sound insulation lining (17.6) on an inner side of the cooling housing (17).

11. A disc vibrating mill apparatus (10) according to claim 1, wherein the cooling housing (17) encloses the grinding system (13) or at least the grinding chamber (13.1), wherein the cooling housing (17) comprises an inlet (17.1) and an outlet (17.9) for the cooling medium (M2), at least one fan (15) is arranged in or on the flow path (P2) at the inlet (17.1) and / or at the outlet (17.9), wherein the cooling housing (17) is constructed in several detachable / mountable segments (17a, 17b, 17.2), in particular in at least three segments, in particular in at least two side segments (17a, 17b) and at least one cover segment (17.2).

12. Use of an internal cooling housing (17) within a mill housing (11) of a disc vibrating mill for defining a cooling jacket (17.5) which at least partially encloses a grinding chamber (13.1) of the disc vibrating mill, and for defining at least one flow path (P2) for cooling medium (M2) extending at least partially along the grinding chamber (13.1) for a cooling medium (M2), in particular for a gaseous cooling medium (M2), in a disc vibrating mill apparatus (10) according to one of the preceding claims.

Images