DE202019106603U1 - Ball mill - Google Patents

Abstract

Ball mill (1) on a laboratory scale, in particular in the form of a centrifugal ball mill and / or planetary ball mill, with at least one grinding bowl holder (3) for at least one grinding bowl (4), with a bracing device (14) with at least one clamping element (13) for axial holding or axially bracing the grinding bowl (4) on or against the grinding bowl holder (3) and / or for axially relaxing the grinding bowl (4), and, preferably, with a support device (7) rotatably mounted about a central axis (Y2), the The grinding bowl holder (3) is rotatably mounted about an offset planetary axis (Y1) to the carrier device (7) and is carried by the latter about the center axis, characterized in that
that the clamping element (13) is designed for holding the grinding bowl (4) on the underside or bottom, and / or
that the clamping element (13) is axially adjustable for axially and / or radially bracing the grinding bowl (4) on or against the grinding bowl holder (3) and / or for axially relaxing or lifting the grinding bowl (4).

Description

The present invention relates to a ball mill on a laboratory scale according to the preamble of claim 1 and a grinding bowl for a ball mill according to the preamble of claim 20. In particular, the invention relates to a ball mill on a laboratory scale, with a carrier device rotatably mounted about a central axis, with at least one grinding bowl holder for at least one grinding bowl, the grinding bowl holder being rotatably mounted about an offset planetary axis to the carrier device and being carried by the latter about the center axis, and with a tensioning device with a tensioning element for axially tightening the grinding bowl against the grinding bowl holder and for axially releasing the grinding bowl.

Laboratory ball mills according to the proposal can be designed as planetary or centrifugal mono ball mills with only one grinding station or as ball mills with several grinding stations, the grinding stations preferably being arranged symmetrically about the center axis in order to compensate moments of inertia as well as possible.

The DE 10 2012 009 987 A1 discloses a laboratory ball mill. This has a carrier device which rotates about a vertical center axis. On the carrier device, a plurality of grinding stations are rotatably mounted to the carrier device about a planet axis offset parallel to the center axis, each grinding station having a cage-like receiving device for at least one grinding bowl which can be filled with grinding stock and grinding media, in particular grinding balls. Each receiving device is carried by the carrier device about the center axis and additionally rotates - mostly in the opposite direction - to the carrier device about the respective planet axis.

The in the DE 10 2012 009 987 A1 Laboratory ball mill described has a bracing device with a clamping element for axially bracing a grinding bowl in the receiving device and a motor drive for the clamping element, which automatically actuates the clamping of the grinding bowl in the holding device. The axial bracing is accomplished by means of an eccentric shaft extending transversely to the planet axis as a clamping element, which is rotatably mounted in the receiving device for the grinding bowl. The ball mill has a motor, which is fixed to a device housing outside of the carrier device. The motor drives a drive shaft that is slotted at its end in order to be able to couple to the eccentric shaft. Coupling to the eccentric shaft is only possible if the grinding station is in a specific insertion and removal position and in the correct rotational orientation. The eccentric shaft can then be rotated via the motor, an axial change in height of the eccentric shaft being transmitted via a plate spring to a spring-loaded pressure plate which lifts the grinding bowl until it abuts with a grinding bowl cover against a stop on the receiving device. By turning back the eccentric shaft it is possible to release the tension again.

The known ball mill has a complex construction. Another disadvantage is that it is difficult to couple the motor to the eccentric shaft to tension / relax the grinding bowl. Since the eccentric shaft is mounted in the receiving device for the grinding bowl, the eccentric shaft also rotates during operation of the ball mill, which leads to unbalance effects which lead to vibrations and increased wear. The design of the receiving device as a rigid cage means that access to the grinding bowl is severely restricted. To take a sample, it is always necessary to remove the grinding bowl from the cage. Therefore, the operation of the known ball mill is not very user-friendly.

The object of the present invention is to provide a ball mill and a grinding bowl for such a mill, which enable a high level of operating convenience with high safety and, in particular, convenient sampling with improved accessibility to the grinding bowl. In particular, tightening and relaxing a grinding bowl on the grinding bowl holder should be quicker and less expensive. The ball mill should preferably have a simple construction. In addition, the imbalance during operation of the ball mill should be low.

The above object is achieved by a ball mill according to claim 1 or a grinding bowl according to claim 20. Advantageous embodiments of the invention are the subject of the dependent claims.

A first aspect of the present invention is that the ball mill preferably has a clamping element for holding the grinding bowl on the underside or bottom on or on an assigned grinding bowl holder.

In particular, the bracing device and the grinding bowl holder are designed for receiving, holding and / or bracing the grinding bowl only on the underside or only on the bottom. This enables a very simple structure and very good accessibility.

The proposed grinding bowl is characterized in particular by the fact that it (only) is provided on the bottom with a holding section for holding or bracing on the bottom on or against or on the associated grinding bowl holder. This results in corresponding advantages.

The grinding bowl is therefore preferably held only on the underside or only on the bottom side on or against the grinding bowl holder and / or the grinding bowl opening is also freely accessible in the operating state - that is to say when the grinding bowl is held on the grinding bowl holder.

According to a second aspect of the present invention, which can also be implemented independently, the clamping element is preferably designed to be axially adjustable for axially and / or radially bracing the grinding bowl on or against the grinding bowl holder. This also allows simple construction and / or good accessibility.

According to a third aspect of the present invention, which can also be implemented independently, the clamping element is preferably axially adjustable for axially relaxing or lifting the grinding bowl - that is, for releasing the grinding bowl from the grinding bowl holder. This enables very simple and, in particular, intuitive operation or a high level of operating comfort.

According to a fourth aspect of the present invention, which can also be implemented independently, the tensioning element is preferably held only by spring force in its position holding or tensioning the grinding bowl, without the need for an actuator, such as the motor and the eccentric shaft DE 10 2012 009 987 A1 , causes the necessary force or preload or axial feed. This allows a simple structure and a reproducible bracing.

It is preferably proposed to design the clamping element to be axially adjustable, wherein by lowering the clamping element or by axially moving the clamping element in a first direction, an axial tensile force can be transmitted via the clamping element to at least one grinding bowl, around the grinding cup downwards or in the first direction pull against the grinding bowl holder or clamp the grinding bowl axially. By lifting the clamping element or by axially moving the clamping element in a second direction, an axial lifting force can preferably be transmitted to the grinding bowl in order to lift the grinding bowl upwards from the grinding bowl holder or to axially relax the grinding bowl. After relaxing the grinding bowl, it can then be removed from the ball mill.

The ball mill according to the invention thus differs fundamentally from that of FIG DE 10 2012 009 987 A1 known ball mill, in which the clamping element, namely the eccentric shaft, transmits an axial compressive force to the grinding bowl in order to press the grinding bowl upwards against a stop of the cage-like grinding bowl holder and thereby clamp it axially. In the known solution, the grinding bowl is then lowered by rotating the eccentric shaft and thus axially relaxed.

The tensioning device provided according to the invention enables a number of essential advantages. On the one hand, the axial bracing of the grinding bowl by pulling the grinding bowl downwards creates the possibility of easy access to the grinding bowl from above and thus convenient sampling. On the other hand, by transferring a tensile force to the grinding bowl, the grinding bowl can be braced and relaxed quickly and with little effort.

The bracing device provided in the ball mill according to the invention can be implemented in a simple manner with a small number of components. In addition, a constructive design can be selected in which the clamping element, together with the grinding bowl holder, is rotatably mounted about the planetary axis with the grinding bowl holder to the carrier device and is carried by the latter about the center axis.

Finally, in the ball mill according to the invention, a plurality of grinding bowl holders or a plurality of grinding stations can be realized in a simple manner, the grinding stations in particular being arranged symmetrically about the center axis in order to compensate for moments of inertia as well as possible, and then each grinding bowl holder is assigned at least one clamping element and the clamping elements simultaneously can be relaxed.

The laboratory ball mill according to the invention can also be used for grinding cups large on a laboratory scale, in particular with a size of more than 100 ml, more than 250 ml and / or up to about 500 ml per grinding cup or even larger, and enables a high grinding capacity.

It is advantageous if a lifting drive is provided for lifting the tensioning element and for automatically actuating the relaxation of the grinding bowl. The lifting force for lifting the clamping element can be generated electrically, hydraulically or pneumatically. The transmission of the lifting force to the tensioning element can take place, for example, with a (knee) lever mechanism, an eccentric tensioner and / or a spindle or rack winch.

Preferably, a motor of a motorized lifting drive can be fixedly attached to a device housing of the ball mill, so that it does not rotate together with the carrier device, but is fixed when the ball mill is in operation. In particular, a motor of the lifting drive does not have to be arranged laterally to the carrier device, but can also be arranged, for example, below the carrier device. This results in reduced lateral dimensions of the device housing of the ball mill according to the invention.

A lifting drive for lifting the clamping element can also be designed to hold the clamping element in a relief position in which the grinding bowl is raised or relaxed relative to the grinding bowl holder. This means that the grinding bowls can be inserted and removed quickly and conveniently.

The lifting drive for the tensioning element particularly preferably actuates only the relaxation of the grinding bowl and, if appropriate, the holding of the grinding bowl in a relief position, but not the tensioning of the grinding bowl on the grinding bowl holder. The axial tensile force to be transmitted to the grinding bowl to clamp the grinding bowl via the clamping element is then not provided by the lifting drive. Instead, at least one spring element acting against the tensioning element can be provided, which is elastically deformed and preloaded when the tensioning element is raised. If the power transmission from the lifting drive to the tensioning element is then terminated and the lifting force transmitted by the lifting drive is preferably reduced to zero, the spring force of the prestressed spring element automatically causes the tensioning element to lower and, as a result, the clamping of the grinding bowl. The lowering of the tensioning element is then effected only via the resilient spring element, the tensile force required for tightening the grinding bowl preferably being smaller than the restoring or spring force of the prestressed spring element. It goes without saying that a plurality of spring elements can be provided to increase the clamping force or tensile force which is transmitted to the grinding bowl via the clamping element.

Basically, however, a design is also not excluded, in which the relaxation of the grinding bowl is manually operated, i.e. the lifting force required to lift the clamping element and, if necessary, the holding force for holding the clamping element in a relief position in which the grinding bowl is axially relaxed, manually applied becomes. The manual power transmission can be carried out in a simple manner, for example with a lever mechanism, in particular a toggle lever mechanism, as is used in scissor-jacks.

As already mentioned, the clamping element can preferably be held and / or supported on the grinding bowl holder and carried with it by the carrier device about the central axis when the carrier device rotates. The tensioning element can be designed as a rod-shaped tie rod which extends coaxially to the planet axis and which is axially displaceable in a shaft of the grinding bowl holder and preferably arranged in a rotationally fixed manner relative to the shaft. The shaft of the grinding bowl holder in turn can be rotatably mounted in a sun gear of the carrier device. The grinding bowl holder can have a grinding bowl plate which is non-rotatably connected to the shaft and against which the grinding bowl with the clamping element is tightened when the grinding bowl is clamped until a frictional or non-rotatable connection between the grinding bowl and the grinding bowl plate is achieved. In particular, the design of the tensioning element as a rod-shaped tie rod extending along the planet axis contributes to the fact that the ball mill according to the invention has a very low imbalance when the carrier device rotates.

In order to be able to transmit a tensile force from the clamping element to the grinding bowl, the clamping element can be connected to a grinding bowl in a form-fitting and / or frictional and non-destructive manner, for example via a bayonet connection.

On its underside, the grinding bowl can have a connecting area or holding section for releasable connection to the clamping element. When the grinding bowl is inserted into the ball mill, the grinding bowl is placed on the grinding bowl holder or the clamping element from above, pushed on and / or turned on. If a bayonet connection is provided between the grinding bowl and the clamping element, the grinding bowl can be rotated in order to align the contact surfaces of the bayonet when the grinding bowl and the clamping element are mechanically connected. The connection is then preferably made via a plug and / or rotary movement. The bayonet connection is preferably designed in such a way that the grinding bowl is only held axially on the tie rod. The grinding bowl is then connected to the tie rod only by a plug-and-turn movement.

In order to prevent a relative rotation between the clamping element and the grinding bowl, a frictional connection can alternatively or additionally also be provided, wherein a friction coating, for example a rubber coating, can be provided on contact surfaces of the clamping element and / or contact surfaces of the grinding bowl. Such a frictional coating can also be provided in addition if the grinding bowl and the clamping element are coupled via a bayonet connection. The frictional engagement ensures that, after the bayonet catch has been formed, the grinding bowl does not inadvertently turn back into a position in which the tie rod only overlaps partial areas of an undercut on the grinding bowl, or connection geometries of the bayonet connection on the grinding bowl and clamping element only overlap in areas or over areas - or reach behind, which could lead to the destruction of the grinding bowl.

Another variant provides a bayonet connection with magnetic means for positioning.

If the ball mill has a plurality of grinding bowl holders, a corresponding bracing device, each with a clamping element for axially holding or bracing a grinding bowl against the grinding bowl holder, can preferably be provided for each grinding bowl holder.

For the simultaneous lifting of several, preferably all, clamping elements, a common lifting device can be provided, wherein in a preferred embodiment the lifting device can have a lifting element arranged below the carrier device and in particular below the clamping elements, preferably a lifting plate. The lifting element can then act against the tensioning elements when lifting from below and transmit the lifting force required for lifting the tensioning elements and, if necessary, holding force to the tensioning elements. In this context, a common motor drive for all clamping elements can be provided, which in particular automatically actuates only the relaxation of the grinding bowls and possibly the holding of the grinding bowls in a relief position.

A coupling device can be provided for the power transmission of a motor to the lifting element, which is preferably also arranged below the carrier device and in particular below the lifting element. The device housing of the ball mill according to the invention then has small lateral dimensions.

It is expedient if the lifting element is arranged in the device housing such that it cannot rotate and / or can be raised and lowered in the axial direction.

In the tensioned state of the grinding bowl, the lifting element is preferably kinematically decoupled from the rotary movement of the carrier device. This leads to a very low imbalance or rotating mass when operating the ball mill according to the invention.

The clamping element can also perform a safety function in addition to the clamping of the grinding bowl. This safety function can result from the property that the clamping element, when the grinding bowl is not inserted, can be lowered considerably more when bracing than when the grinding cup or bowls are inserted. In this context, an advantageous development of the invention provides that the tensioning element can be lowered in a state not connected to a grinding bowl until a frictional and / or positive connection is formed with the lifting device, in particular the lifting element, and / or a fixed housing part of the ball mill in order to brake and / or block a rotary movement of the carrier device. If the connection between the clamping element and the grinding bowl fails during grinding, the clamping element can also assume this or another collision position and fulfill an active braking function. This enables a self-monitoring and fail-safe design. No further elements are necessary in order to additionally monitor the safe position of the clamping element, in which the clamping element is properly connected to the grinding bowl. This enables cost advantages to be achieved.

As already described above, an upward stop-free tensioning of the grinding bowl on the grinding bowl holder is preferably provided. In other words, this means that the grinding bowl or a grinding bowl cover does not have to be pressed against a stop of the grinding bowl holder in order to axially clamp the grinding bowl. This ensures free access to the grinding bowl from above and thus convenient sampling.

A grinding chamber of the grinding bowl can be closed in the usual way by a grinding bowl cover connected to the grinding bowl. The grinding bowl lid can be screwed to the grinding bowl, for example.

Finally, at least one anti-rotation element, for example a locking pin, can be provided on the grinding bowl holder for the grinding bowl, whereby a grinding bowl position or certain rotational position of the grinding bowl relative to the clamping element is possible, in which the grinding bowl can be connected to the clamping element in a positive and / or frictional manner . In this case, a structural configuration of the connection geometries can be provided, for example, in such a way that a connection of the anti-rotation element to the grinding bowl is formed at the same time when the grinding bowl has reached a lowered position or a position relative to the clamping element after it has been plugged in and turned which strike the connection geometries of a bayonet connection of grinding bowl and clamping element against each other and the bayonet connection forms.

The mentioned aspects of the invention and the aspects of the invention resulting from the following description can be implemented independently of one another, but also in any combination.

Further advantages, features, properties and aspects of the present invention result from the claims and the following description of preferred exemplary embodiments with reference to the drawing.

• 1 einen schematischen Schnitt einer erfindungsgemäßen Kugelmühle mit zwei gegenüberliegend angeordneten Mahlstationen gemäß einem ersten Ausführungsbeispiel,
• 2 eine Seitenansicht eines Spannelements zum axialen Verspannen und Entspannen eines Mahlbechers an einer Mahlstation,
• 3 eine perspektivische Ansicht des Spannelements aus 2,
• 4 eine Stirnansicht des Spannelements aus 2,
• 5 einen Schnitt einer mit einem Mahlbecher verbindbaren Hilfsscheibe, die eine Anschlussgeometrie zur Verbindung mit dem Spannelement aus 2 aufweist,
• 6 eine Draufsicht auf die Hilfsscheibe aus 5, und
• 7 einen schematischen Schnitt der erfindungsgemäßen Kugelmühle mit erfindungsgemäßem Mahlbecher gemäß einem zweiten Ausführungsbeispiel.

The invention is explained in more detail below on the basis of exemplary embodiments and with reference to the figures, it being possible for the features of the exemplary embodiments to be combined with one another. Show it

• 1 2 shows a schematic section of a ball mill according to the invention with two grinding stations arranged opposite one another in accordance with a first exemplary embodiment,
• 2nd 2 shows a side view of a clamping element for axially bracing and relaxing a grinding bowl at a grinding station,
• 3rd a perspective view of the clamping element 2nd ,
• 4th an end view of the clamping element 2nd ,
• 5 a section of a connectable with a grinding bowl auxiliary disc, the connection geometry for connection to the clamping element 2nd having,
• 6 a plan view of the auxiliary disc 5 , and
• 7 a schematic section of the ball mill according to the invention with a grinding bowl according to the invention according to a second embodiment.

The same reference numerals are used in the figures for the same or similar parts, corresponding properties and advantages being achieved even if a repeated description has been omitted for the sake of simplicity.

1 shows a schematic section of a proposed ball mill 1 According to a first embodiment with one or more, in particular two grinding stations 2nd , which are preferably constructed identically.

The ball mill 1 is preferably designed as a laboratory mill or planetary ball mill.

The invention is illustrated below using the example of a ball mill 1 with two grinding stations 2nd explained. The description of the characteristics of the ball mill 1 but is not on ball mills 1 with two grinding stations 2nd limited, but equally for laboratory ball mills with more than two grinding stations 2nd or also valid for planetary mono ball mills. Due to the preferably identical structure of the grinding stations 2nd are the characteristics and components of the ball mill below 1 or grinding stations 2nd primarily only using the example of in 1 grinding station shown on the left 2nd described.

The grinding station 2nd has a grinding bowl holder 3rd for a grinding bowl 4th on.

The grinding bowl 4th is optional with an auxiliary disc or an end piece or base element 5 preferably over a plurality of screws 6 provided or firmly connected. The grinding bowl 4th and the auxiliary disc or the base element 5 can in principle also be formed in one piece. Accordingly, either the auxiliary disc or the base element 5 or the grinding bowl 4th form the end face or the end of the grinding bowl with which the grinding bowl 4th on the grinding bowl holder 3rd in the operating state - as in 1 shown - sits or is held.

The grinding bowl holder 3rd is about a vertical planet axis Y1 rotatable to or on a carrier device 7 stored.

The carrier device 7 has a sun gear 8th on that around a central axis Y2 preferably a central bearing shaft 9 is rotatable and in particular via bearings 9a is rotatably mounted.

The grinding bowl holder 3rd is preferably over a shaft 10th or bearings or roller bearings 10a rotatable, especially on or in the sun gear 8th stored.

Preferably, the carrier device 7 or the sun gear 8th from an electric drive motor, not shown, or preferably via an only indicated belt drive 11a driven. When the carrier device rotates 7 or the sun gear 8th becomes the grinding bowl holder 3rd around the center axis Y2 carried along.

The (rotary) drive of the grinding stations 2nd or waves 9 preferably takes place via a rotary coupling or belt coupling 11b like through pulleys 11c and 11 d indicated.

The two grinding stations 2nd lie in relation to the center axis Y2 opposite, so that their moments of inertia compensate each other.

The grinding bowl holder 3rd preferably has a grinding bowl plate 12 for holding the grinding bowl 4th on.

For axial holding or tensioning of the grinding bowl 4th against the grinding bowl plate 12 or the grinding bowl holder 3rd and / or for the axial relaxation of the grinding bowl 4th is a preferably designed as an axial tie rod 13 or a tensioning device 14 intended. In particular, the bracing device 14 the clamping element 13 on.

The clamping element 13 preferably extends coaxially to the planet axis Y1 , the longitudinal axis of the tensioning element 13 and the planet axis Y1 collapse.

The clamping element 13 is preferably non-rotatable with the shaft 10th the grinding bowl holder 3rd connected, but axially movable on or in the shaft 10th guided, as schematically by the arrow or the lifting movement H in 1 shown.

By (axially) lowering the clamping element 13 in the in 1 shown holding or. An axial holding or pulling force can be set using the clamping element 13 and the optional auxiliary disc 5 on the grinding bowl 4th transfer. The holding or pulling force causes the grinding bowl 4th (over or with the auxiliary disc 5 ) down against the grinding bowl plate 12 the grinding bowl holder 3rd held or pulled and therefore the grinding bowl 4th in particular only on the bottom or underside against or on the grinding bowl holder 3rd is held or axially clamped.

In the assembled state or operating state - as in 1 shown - the grinding bowl sits 4th or the auxiliary disc 5 , if available, with the bottom or the bottom, in particular with contact and centering surfaces 16 on the grinding bowl holder 3rd or the grinding bowl plate 12 , particularly preferably on contact and centering surfaces formed therefrom 15 .

In particular, the grinding bowl holder 3rd and the grinding bowl 4th or the contact and centering surfaces 15 , 16 matched to one another and / or designed in a complementary manner such that a radial centering of the grinding bowl 4th on the grinding bowl holder 3rd or to the planet axis Y1 or wave 10th and / or a preferably positive rotational driving or rotary coupling takes place. Alternatively or additionally, the centering and / or rotary coupling can also be achieved by the axial holding or tensioning and / or an engagement of the tensioning element 13 or the tensioning device 14 on the grinding bowl 4th or its auxiliary disc 5 respectively. In addition, as an alternative or in addition, one or more engagement elements, such as a pin or anti-rotation element, can also be used 26 , for a desired positioning, centering and / or rotary coupling between the grinding bowl 4th or its auxiliary disc 5 on the one hand and the grinding bowl holder 3rd or its grinding bowl plate 12 on the other hand.

For relaxing or loosening the grinding bowl 4th from the grinding bowl holder 3rd becomes the tensioning element 13 raised. For example, the grinding bowl 4th then twisted and thereby from an engagement of the clamping element 13 or the tensioning device 14 be solved.

By lifting the tensioning element 13 is preferably an axial lifting force over the clamping element 13 on the grinding bowl 4th transferred, which leads to the grinding bowl 4th (with the auxiliary disc 5 if available) from the grinding bowl plate 12 the grinding bowl holder 3rd raised and / or the grinding bowl 4th axially released or relaxed.

It preferably works when the grinding bowl is relaxed 4th a force against the clamping element from below 13 and lifts it relative to contact and centering surfaces 15 , 16 of the grinding bowl plate 12 and the auxiliary disc 5 at.

An optional holder or pot 17th is used here to hold or mount or support one or more springs, in particular cup springs 18th , for axial pretensioning or movement of the clamping element 13 down or into the holding or tensioning position.

The clamping element 13 is preferably with the holder or pot 17th in particular firmly connected, so that a relative movement between the clamping element 13 and the holder or pot 17th is not possible in the axial direction.

In the place of disc springs 18th other means for storing potential energy, for example a gas pressure spring, can also be provided.

In the example shown is between the springs 18th and the wave 10th an optional sleeve 19th arranged.

The plate spring assembly is located radially on the inside, preferably against the inner ring of the in 1 shown lower rolling bearing 10a over which the wave 10th in the sun gear 8th is stored. The feathers 18th can therefore preferably together with the Grinding bowl holder 3rd , the wave 10th and the tensioning element 13 and the pot and / or the pulley 11c rotate.

When lifting the tensioning element 13 become the disc springs 18th biased or further biased. Is the grinding bowl 4th (with the auxiliary disc 5 ) raised sufficiently far so that the grinding bowl 4th with the auxiliary disc 5 relative to the grinding bowl plate 12 rotate or from this and / or the clamping element 13 turn or the tensioning device 14 can be solved, the grinding bowl 4th with the auxiliary disc 5 from the ball mill 1 removed and optionally a new grinding bowl 4th in the ball mill 1 be used.

In the embodiment shown, the clamping element 13 preferably via a bayonet connection with the auxiliary washer 5 or the grinding bowl 4th can be connected by a combined plug-in and rotary movement. The auxiliary disc 5 or the grinding bowl 4th Accordingly, preferably has a connection region or section 21 on the underside for releasable connection to the tensioning element 13 or for an intervention or an attack of the tensioning device 14 on. Preferred connection geometries of clamping element 13 and auxiliary disc 5 are in the 2nd to 6 shown in detail.

The 2nd to 4th show the preferably designed as a tie rod 13 . On the grinding bowl 4th facing end of the tensioning element 13 it has at least one engagement section or a first connection geometry, in the present case preferably three radial connection projections 20th on, which are spaced apart in the circumferential direction. On the grinding bowl 4th or on the auxiliary disc 5 the connection area is provided, in particular in the form of one or more, preferably complementary connection projections or sections 21, which are connected to the tensioning element 13 or its connecting projections 20th cooperate, in particular for the axially positive holding of the clamping element 13 or the tensioning device 14 are overlapped axially.

The ball mill 1 or tensioning device 14 preferably has a lifting device 22 for axially moving or lifting the clamping element 13 or for the automatic actuation or effecting the relaxation or loosening of the grinding bowl 4th from the grinding bowl holder 3rd on. In particular, the lifting device 22 with an axial force (lifting force) on the clamping element 13 , for example by means of a lifting element 23 , act, whereby in 1 the clamping elements 13 only in the lowered state or in the tensioned or the grinding bowl 4th holding state are shown.

Connecting the grinding bowl 4th with the tensioning element 13 is done by placing the grinding bowl 4th (with the auxiliary disc 5 ) on the contact and centering surfaces 15 at the top of the grinding bowl plate 12 , the grinding bowl 4th with the auxiliary disc 5 to form a bayonet connection (for axially aligned alignment or overlapping of the connection projections 20th , 21st ) in the attached state relative to the grinding bowl plate 12 is twisted. For this purpose, preferably the grinding bowl 4th with the auxiliary disc 5 from the grinding bowl plate 12 - In particular with the clamping element 13 - be lifted upwards and axially relaxed.

Then the clamping element 13 lowered or against the clamping element 13 acting lifting force for lifting the clamping element 13 withdrawn so that the disc springs 18th or tensioning device 14 the grinding bowl 4th over the auxiliary disc 5 and the tensioning element 13 (due to the between the auxiliary disc 5 and the tensioning element 13 formed bayonet connection) on the contact and centering surfaces 15 of the grinding bowl plate 12 , i.e. on the grinding bowl holder 3rd , set, hold or tension. The removal process of the grinding bowl 4th is designed in reverse order accordingly.

For (simultaneous) lifting one, several or all clamping elements 13 is a lifting device 22 provided, preferably one below the clamping elements 13 arranged and exemplified as a lifting plate lifting element 23 having. By lifting the lifting element 23 it is possible to simultaneously have sufficient lifting power to lift all clamping elements 13 to transfer and simultaneously several grinding bowls 4th , especially all grinding bowls 4th to relax at the same time. The realization of a position-independent relaxation of the grinding bowl 4th is possible in a simple way.

For lifting the lifting element 23 or clamping element 13 or for the lifting device 22 an electric, hydraulic and / or pneumatic drive can be provided. The drive then serves to automatically actuate the relaxation of one, more or all of the grinding bowls 4th and is, preferably, designed for the clamping elements 13 in a relief position in which the grinding bowl 4th axially relaxed. This is the insertion and removal of the grinding bowl 4th possible in a simple and comfortable way. The grinding bowl 4th can be opened at the same time when in use and thus allow convenient sampling at any time during grinding. For this, the grinding bowl 4th not be removed.

The drive with the drive elements, such as an electric motor, can be below the lifting element 23 be arranged.

In principle, however, manual generation of the lifting force is also possible.

For transferring the lifting force to relax the grinding bowl 4th on the lifting element 23 can with a fixed positioning of the lifting device 22 a variety of different mechanisms can be used. For example, the lifting force of a drive with a toggle mechanism, a coupling with an eccentric tensioner or a spindle or rack winch on the lifting element 23 be transmitted.

The lifting element 23 is preferably only in the relaxed state of the grinding bowl 4th with the clamping elements 13 connected. If the grinding bowl 4th are tensioned, is the mechanism that applies the lifting force to the tensioning elements 13 exercises, however, preferably entirely from the rotation of the components of the ball mill 1 decoupled. Due to fewer rotating components, the unbalance or rotating mass during operation of the ball mill is reduced 1 significantly reduced.

The one for tightening the grinding bowl 4th on the grinding bowl holders 3rd the required tractive force is preferably only via the disc springs 18th generated and on the clamping elements 13 transfer. The one for lifting the clamping elements 13 and for axial relaxation of the grinding bowl 4th The drive provided then makes no contribution to the tensioning of the grinding bowl 4th required tensile or tension force.

As already explained above, the drive is therefore preferably not involved in the tensioning of the grinding bowls 4th .

Otherwise, the lifting element extends 23 preferably not in the radial direction via the clamping elements 13 In addition, at least preferably not in the radial direction over the sun gear 8th out. This results in a space-saving design of the ball mill 1 . In addition, the drive components of the drive for generating the lifting force are preferably below the lifting element 23 arranged and not laterally. This also contributes to a small size of the ball mill 1 in the lateral direction.

Accessibility to the grinding stations 2nd is very good for the user. Due to the little exposed components, the cleaning of the components of the ball mill 1 simplified.

The grinding bowl is used for operation 4th preferably through a grinding bowl lid 24th closed, which is preferably screwed. In the grinding bowl lid 24th are preferably one or more valves 25th intended.

The clamping elements 13 can in addition to bracing the grinding bowl 4th also perform a safety function. Here there is the constructive possibility that the clamping elements 13 with grinding bowls not used 4th when tensioning much further through the disc springs 18th be pulled down as if the grinding bowl or bowls 4th are used. “Insert” in the sense of the invention is the placement of the respective grinding bowl 4th (with the auxiliary disc 5 ) on the contact and centering surfaces 15 of the grinding bowl plate 12 to understand. So if at least a grinding bowl 4th or several grinding bowls 4th are not used, the respective clamping element 13 be lowered further so that the tensioning element 13 in a frictional and / or positive connection with the lifting device 22 , especially with the lifting element 23 , and / or with a fixed housing part of the ball mill 1 arrive and thus start up the ball mill 1 can be prevented by mechanically blocking the rotary movement. By preloading the disc springs 18th can then the stabilizing element 13 perform an active braking function. This also ensures that both grinding bowls are always in place 4th in the ball mill 1 used and braced to the mill 1 to put into operation. It can be used as a securely clamped grinding bowl 4th detect without the need for additional sensors or elements to determine the reliable position of the clamping elements 13 to monitor. Otherwise, a constructive embodiment can be implemented in which the tensioning element 13 if the bayonet connection between the clamping element fails 13 and the grinding bowl 4th also assumes a more lowered position during the grinding and in a frictional and / or form-fitting contact with the lifting device 22 , especially the lifting element 23 reached.

The illustrated and described bracing of the grinding bowl 4th against the grinding bowl holders 3rd by pulling or holding the grinding bowl 4th against the grinding bowl holders 3rd with the clamping elements 13 preferably allows a self-monitoring and fail-safe construction, whereby if the grinding bowl is not used and / or if the connection between a clamping element fails 13 and a grinding bowl 4th a position of the clamping element in every machine condition 13 is taken in which the ball mill 1 is automatically transferred to a safe operating state.

An anti-rotation pin or element 26 can be provided, as in FIG 1 schematically indicated on the right-hand side to prevent an unwanted twisting of a grinding bowl 4th to prevent during grinding. Such an anti-rotation function is advantageous for the stability of the connection between the grinding bowl 4th and the tensioning element 13 . In addition, by using one or more anti-rotation pins or elements 26 at high loads, a torque can be safely applied to the grinding bowls 4th transfer.

It is constructively possible to use an anti-rotation pin 26 to be arranged so that the positioning of the grinding bowl 4th in the correct rotational position relative to the grinding bowl plate 12 or clamping element 13 is simplified or a complete axial placement of the grinding bowl 4th for example, only possible with a bayonet connection. As a result, the anti-rotation pin can be 26 , for example on the underside of the auxiliary disc 5 can be provided in a corresponding hole in the grinding bowl plate 12 lower only when the rotary position of the grinding bowl 4th relative to the clamping element 13 to a substantially complete overlay of the connection projections 20th , 21st leads.

Below is a second embodiment of the proposed ball mill 1 and the proposed grinding bowl 4th based on the schematic section of 7 explained in more detail, the previous explanations and explanations in particular correspondingly or in addition.

7 shows the ball mill 1 in the area of only one grinding station 2nd , with other parts, like the sun gear 8th , have been omitted for reasons of clarity.

In the second embodiment, the grinding bowl 4th - Just as in the first embodiment - from the grinding bowl holder 3rd , the tensioning device 14 or the clamping element 13 preferably (at least essentially) held or clamped only on the underside or bottom side, in particular against or on the grinding bowl holder 3rd or their grinding bowl plates 12 , as shown.

Preferably the grinding bowl 4th held positively in the axial and / or radial direction in the tensioned state or holding state. However, in principle, in particular in the axial direction, there is only a frictional holder against lifting or pulling off the grinding bowl 4th from the grinding bowl holder 3rd possible, which will be discussed later.

The clamping element 13 or the tensioning device 14 preferably has at least one radially movable holding element 27th for holding or centering the grinding bowl 4th on.

In the example shown, there are preferably several holding elements 27th provided and in particular distributed over the circumference (evenly). This is particularly conducive to a desired centering and / or clamping or holding distributed over the circumference. In particular, a centering vice can be formed.

In the following, however, the focus is always only on the design of a holding element 27th discussed in more detail, this preferably also for the other holding elements 27th serves. However, in principle it is also possible for holding elements of different designs 27th can be used if necessary.

The holding elements are in the holding state 27th moved or biased radially in particular outwards, preferably around in a recess or groove or circumferential groove 28 intervene and / or the holding or connecting section 21st to reach behind or overlap and / or radially against a wall 29 of the grinding bowl 4th (or one through the auxiliary disc 5 o. Like. formed bottom element or end piece of the grinding bowl 4th ) to put on or press on.

The wall preferably surrounds 29 the holding elements 27th and / or delimits the recess. or groove 28 .

The recess or circumferential groove is preferably 28 , is open radially inwards.

The holding or connecting section preferably delimits 21st the recess or groove 28 in the axial direction and / or downwards.

The holding or connecting section is preferably 21st formed like a ring or flange and / or protrudes radially, especially inwards.

The holding or connecting section preferably forms 21st an axial stop and / or a preferably circumferential shoulder, in particular for one or more holding elements 27th , alternatively for a connection projection 20th of the clamping element 13 according to the first embodiment.

The clamping element preferably engages 13 or the tensioning device 14 or the at least one holding element 27th from the inside on the grinding bowl 4th or from the auxiliary disc 5 o. Like. formed bottom element or end of the grinding bowl 4th , especially on the lower end or peripheral wall 29 on and / or from the inside into the recess or circumferential groove 28 a.

However, it is basically also possible that the grinding bowl 4th alternatively or additionally, it is held or clamped in the holding state from radially outside and / or axially below in the region of its lower or bottom end.

The grinding bowl is preferably held or braced 4th always axially below a grinding bowl bottom delimiting the grinding bowl interior 4a .

In particular, is or are the receptacle or groove 28 , the wall 29 and / or the connecting section 21st in the area of the lower or the end of the grinding bowl opposite the grinding bowl opening 4th arranged.

Preferably, the grinding bowl is formed 3rd or the grinding bowl plate 12 a particularly conical receptacle or groove 12a for the grinding bowl 4th or its lower end or wall 29 .

In the second embodiment, the bracing device 14 or the clamping element 13 preferably a head 13a on the end of the clamping element on the grinding bowl side 13 is arranged or formed. The head 13a is about a screw 13c with the clamping elements 13 non-positively connected.

The clamping element 13 or the head 13a preferably has a contact surface inclined to the radial plane 13b on, which serves as an inclined plane or on the holding element 27th acts to axially lower the clamping element 13 the at least one holding element 27th to move radially, here outwards or to preload.

The at least one holding element 27th is preferably over a sliding surface 12b on the grinding bowl holder 3rd or grinding bowl plate 12 axially supported so that when the clamping element is axially lowered 13 - So axially moving the head 13a to the grinding bowl plate 12 - The holding element 27th radially - preferably outwards - is moved. This engagement or bracing movement preferably or optionally does not run purely radially, but can, depending on the symmetrical or asymmetrical inclination of the surfaces 12b and 13b also inclined in addition to the radial plane, in particular directed downward, around a desired axial bracing of the grinding bowl 4th or its holding section 21st against the grinding bowl holder 3rd or the grinding bowl plate 12 to effect.

The inclination of the engagement or bracing movement of the holding element 27th to the radial plane is preferably more than 2 ° or 5 ° and / or preferably less than 10 ° or 15 °.

The holding element 27th is preferably at least substantially triangular or trapezoidal in cross-section in the depicted example, with one surface, in particular the outer surface 27a , preferably essentially a peripheral surface, in particular with respect to the preferably ring-like turn 29 forms. However, other shapes are also possible.

The holding element 27th can be either punctiform or linear radial and / or axial on the grinding bowl 4th or attack the end piece or act on it.

In the display example, the holding element engages 27th preferably only or only essentially with a lower end or stop 27b on the grinding bowl 4th or its connecting section 21st on and / or in the receptacle or groove 28 a.

However, the holding element 27th alternatively or additionally also with its peripheral or outer surface 27a on the grinding bowl 4th or its wall 29 attack, fit and / or be pressed. In this case, if necessary, only one frictional shot in the axial direction between the tensioning device 14 or the holding element 27th or the holding elements 27th on the one hand and the grinding bowl 4th or its wall 29 on the other hand, are generated in the axial direction. The holding element 27th or its outer surface 27a for example only punctiform or linear on the wall 29 issue.

Alternatively or additionally, the holding element 27th also radially into the wall 29 or a depression formed therein, for example in the case of a concave formation of the wall 29 , and corresponding shape, for example spherical design, of the holding element 27th intervene and thereby - if necessary additionally - a form-fitting holder or fixing the grinding bowl 4th effect in the axial direction.

The from the holding section 21st formed axial contact surface or shoulder for the holding element 27th or its stop 27b is preferably slightly inclined with respect to the radial plane, in particular towards the free end or opposite to the inclination of the engagement or bracing movement of the holding element 27th .

The tensioning device 14 or the at least one holding element 27th preferably has a reset device or a reset element 30th on to the holding element 27th or the holding elements 27th when releasing the tension or axial Lift the tensioning element 13 / Head 13a to move back to a starting position - here to move radially inwards - so that the grinding bowl 4th or its holding section 21st is released to the grinding bowl 4th from the grinding bowl holder 3rd to be able to take off or lift off (axially).

Is preferably as a reset device or reset element 30th an elastic element such as a spring or an elastic band or the like is provided around all holding elements 27th preload radially inwards and thereby the desired return when lifting the clamping element 13 or head 13a to effect. In the example shown, the tensioning element runs 13 for example, through holes in the holding elements 27th and extends over the entire scope. However, other constructive solutions are also possible.

Preferably between the head 13a and a seal on the grinding bowl plate 31 , in particular as a ring or molded seal, preferably arranged all around. The seal 31 can, for example, in an annular groove 12c of the grinding bowl plate 12 be arranged or held. However, other constructive solutions are also possible.

The clamping element 13 with his head 13a is preferably via an upper bearing element 32a and / or a lower bearing element 32b axially displaceable or movable in the shaft 10th or the associated grinding bowl plate 12 managed or stored. However, other constructive solutions are also possible.

The clamping element 13 is not necessarily with the shaft in the second embodiment 10th rotary coupled.

The wave 10th is preferably about screws 12c firmly with the grinding bowl plate 12 connected or screwed to keep it rotatable in the desired manner.

In the second embodiment, the return spring or the spring package, here the package of disc springs 18th , preferably around the tensioning element 13 around, especially between one shoulder 13d of the clamping element 13 as an axial stop on the one hand and a stop on the shaft 10th or the grinding bowl plate 12 arranged or clamped on the other hand as a second axial stop. However, other constructive solutions are also possible.

The disc springs 18th are preferably within the wave 10th or grinding bowl holder 3rd arranged.

The return spring or the spring assembly is preferably pre-tensioned, in particular also when the tensioning element is tensioned or lowered 13 or the tensioning device 14 .

The grinding station 2nd or the wave 10th is preferably by means of the bearings 10a rotatable around the planet axis Y1 stored.

The grinding station 2nd , Grinding bowl holder 3rd or wave 10th is preferably over an intervention 10b or a belt wheel, not shown, or the like, rotationally coupled, in particular with the central bearing shaft 9 that when turning the carrier device 7 or sun gear 8th (in 7 not shown) the grinding station 2nd or grinding bowl holder 3rd and with it the grinding bowl 4th around the planet axis Y1 rotate.

In the second embodiment, the lifting device 22 preferably a motor or drive 33 and / or an actuator 34 on, which is particularly preferred over an inclined plane or another gear on the lifting element 23 for axially moving or lifting the clamping element 13 works. If necessary, however, the control element 34 also instead of the lifting element 23 directly on the clamping element 13 act (axially). Other constructive solutions are also possible.

The grinding station 2nd or grinding bowl holder 3rd or wave 10th preferably has an intervention option 10c and / or a stop 10d for the lifting device 22 or a holding device 35 the lifting device 22 to an axial abutment or holder of the grinding bowl holder 3rd or the wave 10th during axial movement, in particular lifting, of the tensioning element 13 , enable or ensure.

As already mentioned, in the second exemplary embodiment there is no separate floor element like the auxiliary pane 5 , on the grinding bowl 4th attached or shown. However, a suitable end piece or base element or a suitable insert on the grinding bowl 4th to form and / or adapt the intervention options for the grinding bowl holder 3rd or the grinding bowl plate 12 and / or for the tensioning device 14 be arranged or attached. The attachment can be done, for example, by clamping and / or screwing. Such an end piece or base element can also be used to retrofit existing grinding bowls 4th can be used to adapt to the new clamping system.

A particularly preferred aspect of the solution according to the regulations is that the grinding bowl 4th preferably threadless and / or form-fitting in the axial direction on the Grinding bowl holder or on the grinding bowl bottom 12 can be held or fixed and / or braced.

The tensioning device is particularly preferred 14 designed as a quick-clamping device and / or only engages in the recesses or depressions of the grinding bowl on the bottom or underside 4th a, with the bottom or bottom of the grinding bowl 4th optionally by an end piece or base element, such as the auxiliary disc 5 or the like, can be formed.

It should be noted that the pretensioner 14 in the example shown, preferably the clamping element 13 with his head 13a , one or more or all holding elements 27th , the spring return or disc springs 18th and / or the lifting device 22 may include.

Individual aspects and features of the various exemplary embodiments can be combined with one another as desired, but can also be implemented independently of one another.

Reference symbol list

1

Ball mill

2nd

Grinding station

3rd

Grinding bowl holder

4th

Grinding bowl

4a

Grinding bowl bottom

5

Auxiliary disc

6

screw

7

Carrier device

8th

Sun gear

9

central bearing shaft

9a

warehouse

10th

Shaft (grinding bowl)

10a

roller bearing

10b

Intervention

10c

Undercut

10d

shoulder

11

wave

11a

Belt drive

11b

Belt coupling

11c

Pulley

11d

Pulley

12

Grinding bowl plate

12a

admission

12b

Sliding surface

12c

Ring groove

12d

screw

13

Clamping element

13a

head

13b

Contact area

13c

screw

13d

attack

14

Tensioning device

15

Contact surface (cup)

16

Contact surface (plate)

17th

pot

18th

Belleville spring

19th

Sleeve

20th

Connection projection

21st

Connecting section

22

Lifting device

23

Lifting element

24th

Grinding bowl lid

25th

Valve

26

Anti-rotation element

27th

Holding element

27a

Outside surface

27b

attack

28

Circumferential groove

29

Wall

30th

Reset element

31

poetry

32a

upper bearing element

32b

lower bearing element

33

drive

34

Actuator

35

Holding device

H

Lifting motion

Y1

Planetary axis

Y2

Center axis

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102012009987 A1 [0003, 0004, 0014, 0016]

Claims (22)

Ball mill (1) on a laboratory scale, in particular in the form of a centrifugal ball mill and / or planetary ball mill, with at least one grinding bowl holder (3) for at least one grinding bowl (4), with a bracing device (14) with at least one clamping element (13) for axial holding or axially bracing the grinding bowl (4) on or against the grinding bowl holder (3) and / or for axially relaxing the grinding bowl (4), and, preferably, with a support device (7) rotatably mounted about a central axis (Y2), the The grinding bowl holder (3) is rotatably mounted to the carrier device (7) about an offset planetary axis (Y1) and is carried by it around the center axis, characterized in that the clamping element (13) is designed for holding the grinding bowl (4) on the underside or bottom , and / or that the clamping element (13) is axially adjustable for axially and / or radially bracing the grinding bowl (4) on or against the grinding bowl holder (3) and / or it is designed for the axial relaxation or lifting of the grinding bowl (4). Ball mill after Claim 1 , characterized in that the clamping element (13) directly holds the grinding bowl (4) or engages it. Ball mill after Claim 1 , characterized in that the clamping element (13) indirectly holds or engages the grinding bowl (4). Ball mill according to one of the preceding claims, characterized in that the bracing device (14) and the grinding bowl holder (3) are designed for holding, holding and / or bracing the grinding bowl (4) only on the underside or only on the bottom side. Ball mill according to one of the preceding claims, characterized in that the grinding bowl (4) can be held up or axially clamped against the device housing of the ball mill (1) without a stop on the grinding bowl holder (3). Ball mill according to one of the preceding claims, characterized in that the clamping element (13) can be connected to the grinding bowl (4) in a form-fitting and / or frictional and non-destructive manner. Ball mill according to one of the preceding claims, characterized in that, by lowering the clamping element (13), an axial tensile force can be transmitted via the clamping element (13) to the grinding bowl (4), in order to lower the grinding bowl (4) against the grinding bowl holder (3). to pull and clamp the grinding bowl (4) axially against the grinding bowl holder (3). Ball mill according to one of the preceding claims, characterized in that by lifting the clamping element (13) an axial lifting force can be transmitted via the clamping element (13) to the grinding bowl (4) in order to move the grinding bowl (4) upwards from the grinding bowl holder (3) lift and axially relax the grinding bowl (4) or to loosen the grinding bowl (4) from the grinding bowl holder (3). Ball mill according to one of the preceding claims, characterized in that at least one spring element (18) acting against or on the clamping element (13) is provided, the spring element (18) being preloaded when the clamping element (13) is raised and when the clamping element () is lowered ( 13) is relieved. Ball mill according to one of the preceding claims, characterized in that the clamping element (13) is held and / or supported on the grinding bowl holder (3) and with it by the carrier device (7) during the rotation of the carrier device (7) about the center axis (Y2) is carried along Ball mill according to one of the preceding claims, characterized in that the clamping element (13) is designed as a and / or rod-shaped tie rod which extends coaxially to the planet axis (Y1). Ball mill according to one of the preceding claims, characterized in that a drive or a lifting device (22) is provided for lifting the clamping element (13) and / or the grinding bowl (4). Ball mill after Claim 11 , characterized in that the lifting device (22) has a lifting element (23) arranged below the tensioning elements (13), the lifting element (23) preferably acting against the tensioning elements (13) from below during or for lifting. Ball mill Claim 13 , characterized in that the lifting element (23) is arranged in a rotationally fixed manner and / or can be raised and lowered in the axial direction and / or in the tensioned state of the grinding bowl (4) the lifting element (23) is kinematically dependent on the rotational movement of the carrier device (7) and / or the rotary movement of the grinding bowl holder (3) is decoupled. Ball mill according to one of the preceding claims, characterized in that the clamping element (13) in a friction and / or positive connection with the lifting device (22) and / or a fixed housing part of the ball mill (1) can be lowered in order to brake and / or block a rotary movement of the carrier device (7). Ball mill according to one of the preceding claims, characterized in that at least two grinding bowl holders (3) and at least two bracing devices (14), each with a clamping element (13) for axially bracing or holding a grinding bowl (4) against a grinding bowl holder (3), are provided are, preferably wherein a common lifting device (22) is provided for the simultaneous lifting of several, preferably all, clamping elements (13). Ball mill according to one of the preceding claims, characterized in that the clamping element (13) or the clamping device (14) has or forms a centering clamp. Ball mill according to one of the preceding claims, characterized in that the clamping element (13) or the clamping device (14) has a plurality of holding elements (27) which are distributed over a circumference or can be moved radially, for frictionally or positively holding or centering the grinding bowl (4). having. Ball mill according to one of the preceding claims, characterized in that the ball mill (1) has a grinding bowl (4) which is provided on the bottom with a holding section (21) for holding on the floor on or on the grinding bowl holder (3). Grinding bowl (4) for a ball mill (1), characterized in that the grinding bowl (4) is provided on the bottom with a holding section (21) for holding or bracing on the bottom on or on a grinding bowl holder (3) of the ball mill (1). Grinding bowl after Claim 20 , characterized in that the holding section (21) is ring-like or flange-like and / or preferably projects radially inwards. Grinding bowl after Claim 20 or 21st , characterized in that the holding section (21) forms or delimits a recess or circumferential groove (28) which is open radially inwards.

Images