EP2861350B1 - Ball mill with spatial imbalance compensation - Google Patents
Ball mill with spatial imbalance compensation Download PDFInfo
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- EP2861350B1 EP2861350B1 EP13731070.2A EP13731070A EP2861350B1 EP 2861350 B1 EP2861350 B1 EP 2861350B1 EP 13731070 A EP13731070 A EP 13731070A EP 2861350 B1 EP2861350 B1 EP 2861350B1
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- Prior art keywords
- grinding bowl
- grinding
- ball mill
- holder
- eccentric
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- 239000000463 material Substances 0.000 description 5
- 238000007789 sealing Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/04—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with unperforated container
- B02C17/08—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with unperforated container with containers performing a planetary movement
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/14—Mills in which the charge to be ground is turned over by movements of the container other than by rotating, e.g. by swinging, vibrating, tilting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
- B02C17/1815—Cooling or heating devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
- B02C17/24—Driving mechanisms
Definitions
- the invention relates to a ball mill with at least two Mahlbecherhalterache arranged on a machine base plate for each clamped therein in a horizontal arrangement, end Mahlbecherenden and a filling of balls as Mahl stresses having Mahlbecher and with a rotational movement of the Mahlbecherhalterache inducing drive.
- a ball mill with the aforementioned features is known from WO 2009/026990 A1 known.
- the known ball mill are in contrast to otherwise in multiple use planetary ball mills, such as in the DE 197 12 905 C2 described, due to the as a respect to their longitudinal axis flat or up to an angle of 60 degrees with respect to the horizontal plane oblique orientation of the grinding bowl defined lying arrangement of Mahlbecher changed the trajectories of the balls inside the Mahlbechers such that the front Mahlbecherenden as stop and grinding surfaces involved in the crushing process.
- a periodic force / movement component acts on the balls in the direction of the side walls of the grinding bowl, while on the other hand due to the horizontal arrangement of the grinding bowl another, further force / movement component in the direction of the ends of the grinding bowl acts on the balls.
- This ensures that during the movement of the balls on the side walls of the Mahlbechers a predominantly rubbing stress and the impact of the balls on the Mahlbecherenden an impact stress of mecanicmahlenden regrind occurs.
- the ground material is better mixed due to the movement of the balls in the longitudinal direction of the grinding chamber, so that all the particles of the material to be ground are claimed simultaneously and thus the shredding efficiency is increased.
- the weighting of friction and impact components can be varied by adjusting or selecting the grinding bowl length and the grinding bowl diameter in relation to the resonant circle diameter as well as the ball diameter and the specific ball mass.
- the invention is therefore based on the object to improve a ball mill of the type mentioned so that the grinding bowls perform a directional and predeterminable circular motion, so that adjusts a precisely repeating movement regime of the balls.
- each of the paired Mahlbecherhalteronne via two connected to it in each case with respect to an axis of symmetry of the Mahlbechers opposite sides eccentric waves is offset by means of the drive in a parallel to the plane of the machine base aligned positively driven circular motion, wherein on each the two machine base plate passing through, each associated with a Mahlbecherhalterung eccentric shafts below the machine base plate a counterweight as mass balance for the connected to the eccentric Mahlbecherhalterung with Mahlbecherhalter clamped therein on the relative to the longitudinal axis of the eccentric shaft to the connection of Mahlbecherhalterung to the eccentric shaft opposite side of the eccentric shaft is arranged and that in the two Mahlbecherhalterache the eccentricities of the two connected to each eccentric shafts are the same, sow ie whose counterweights are arranged with respect to the longitudinal axis of the grinding bowls opposite sides and the Mahlbecherhalterache are offset by the drive in a respective opposite and opposite phase circular motion.
- a counterweight is arranged on the eccentric shaft, which is installed on the opposite side of the eccentric shaft to the connection of the Mahlbecherhalterung to the upper end of the associated eccentric shaft with respect to the longitudinal axis of the eccentric shaft. Additional unbalance moments are caused by the fact that the centrifugal force acting on the Mahlbecherhalterung arranged on one end of an eccentric shaft on the one hand and the centrifugal force acting on the counterweight arranged on the other end of the eccentric shaft on the other hand causes a torque about horizontally extending axes. These unbalance moments rotate with the rotation of the grinding bowls and the counterweights about the vertical on the plane in which the grinding bowls move.
- the "lying" arrangement of the grinding bowls is defined in the same way as in the generic WO 2009/026990 A1, namely as a flat or inclined at an angle of 60 degrees with the horizontal arrangement.
- the invention basically extends to an arrangement of two grinding bowls, the realization of the invention in embodiments with a simple multiple of two grinding bowls, for example with four or six grinding bowls, is possible.
- each Mahlbecherhalterung is connected to two eccentric shafts, which are arranged with respect to an axis of symmetry of the clamped Mahlbechers on opposite sides of the Mahlbecherhalterung, can be provided for alternative embodiments of the invention that each Mahlbecherhalterung at their respect to the longitudinal axis of the Mahlbechers opposite sides of each an eccentric shaft is connected or alternatively that each Mahlbecherhalterung is connected in the region of the two end faces of the Mahlbechers to each eccentric shaft.
- each Mahlbecherhalterung from a grinding bowl flat or obliquely receiving and each connected to its axis of symmetry of the Mahlbechers opposite sides connected to the two eccentric shaft base and a hinged to the lower part and the Mahlbecher above cross , with the lower part fauxspannbaren upper part consists.
- the energy input required for the comminution process is of importance insofar as it must not lead to an inadmissible heating of the ground material.
- the glass transition or the softening temperature of the plastic are exceeded, which would lead to a sticking or clogging in the grinding chamber.
- the drive according to the invention of the two grinding bowls via associated eccentric shafts provides a good opportunity to provide for a corresponding cooling of the grinding bowl.
- the two each associated with a Mahlbecherhalterung eccentric shafts have a hollow shaft body for the passage of a coolant and connected to the Mahlbecher Mahlbecherhalterung sealingly connected to the two eccentric shafts and it is formed penetrating cavities, and that one of the grinding bowl holder associated eccentric shaft is connected to a coolant inlet and the other of the Mahlbecherhalterung associated eccentric shaft to a coolant outlet.
- the lower part of Mahlbecherhalterung in its the ends of the two eccentric shafts respectively comprehensive connection areas and in its a support for the clamped Mahlbecher forming central region is provided in each case with cavities for the passage of the coolant, while still can be provided that the The upper part of the grinding bowl holder which engages over the grinding bowl is provided in its center part lying on the grinding bowl with at least one cavity connected to the cavities of the connecting regions of the lower part for the passage of the coolant.
- the above-described cooling of a grinding bowl or grinding bowl holder via coolant to be passed through the eccentric shafts can be used in all types of mills in which eccentric shafts are or can be used as the drive.
- the application of the above-described inventive idea is not limited to the design of a ball mill with horizontally arranged grinding bowls, but applicable to all mills with an eccentric shaft drive.
- the Mahlbecherenden the flat or obliquely clamped Mahlbecher are flat, so that, for example, in a circular cross-section having Mahlbecher results in a cylindrical design of the Mahlbechers.
- the end-face Mahlbecherenden the Mahlbechers are formed dome-shaped.
- the use of longitudinally extended grinding bowls makes sense in which the length given in the longitudinal extension and thus the distance between the grinding bowl ends is in any case greater than the diameter of the region lying between the grinding bowl ends.
- different Mahlbecherformen are useful in implementing the invention.
- the respective grinding bowls have a circular cross-section or an elliptical cross-section or a polygonal cross-section with rounded corner regions, wherein in the latter embodiment the rounded corner regions of the respective grinding bowl have a radius corresponding to the radius of the grinding bodies when grinding bodies are used in the grinding bowl can.
- Mahlbecherformen are also possible, for example grinding bowl with an elliptical longitudinal section.
- the eccentricities of the compounds Mahlbecherhalterung with the two associated eccentric shafts are each sized equal, so that there is a circular movement Mahlbecherhalterung with clamped Mahlbecher, the longitudinal axes of the clamped in different Mahlbecherhalterungen grinding bowl in all Positions of Mahlbecher remain during their circulation in a parallel arrangement.
- the eccentricities of the connections of the Mahlbecherhalterung with the two associated eccentric shafts is dimensioned differently, so that at the one connected to the lower eccentric eccentric shaft connected connection area of the Mahlbecherhalterung a circular motion is initiated, while on the opposite side of the Mahlbecherhalterung the the larger eccentric eccentric shaft leads to a pendulum movement of the clamped grinding bowl.
- the one eccentric shaft is driven with the lower eccentricity, while the other eccentric shaft is carried.
- each a toothed disc and the drive medium is designed as a circumferential, meshing with the teeth of the toothed pulley toothed belt, wherein on one of the two toothed discs to the device of the compensation game, the width of the tooth gaps Toothed disc is larger than the width of the teeth of the inserted toothed belt.
- FIG. 1 The first out FIG. 1 as a whole apparent ball mill 10 has a (not fully shown) housing 11, at the top of a machine base plate 12 is arranged for two Mahlbecherhalter 13, installed thereon for each one grinding bowl to be clamped therein.
- Each Mahlbecherhalterung 13 consists of a lower part 14, which has two opposing outer terminal portions 16 with an intermediate, forming a bearing surface for a grinding bowl to be clamped central region 15.
- a top part 17 engaging over the center region 15 of the grinding bowl holder 13 is mounted pivotably about a pivot axis 18 arranged on the connection region 16, wherein the upper part 17 on the side opposite its pivot axis 18 by means of one of a locking lever 20 in the illustrated embodiment actuable latch 19 with the other terminal portion 16 of the lower part 14 is lockable.
- a locking mechanism that can be actuated by screwing, for example a screwable clamping mechanism with a corresponding clamping bracket.
- the upper part 17 of the Mahlbecherhalterung 13 engages over the Auflageril kaue forming a Mahlbecher middle region 15 of the lower part 14 also with a central part 22, wherein the central region 15 of the lower part 14 as well as the central part 22 of the upper part 17 are adapted in their shape in each case to the outer contour of the Mahlbecherhalterung 13 Mahlbechhalterung to be clamped Mahlbechers.
- a projecting over the machine base plate 12 above motor 21 is arranged, which drives the two arranged on the machine base plate 12 Mahlbecherhalterept 13 via a provided below the machine base plate 12 drive mechanism.
- each eccentric shaft 25 serves as drive for each of the grinding bowl holders 13 each two eccentric shafts 25, which are each connected to the two connection areas 16 of each Mahlbecherhalterung 13 and connected thereto.
- each eccentric shaft 25 has a drive section 26 located below the machine base plate 12 and a connection section 27 projecting beyond the machine base plate 12 and fixed in the associated connection region 16 of the grinding bowl holder 13.
- the sections 26 and 27 of each eccentric shaft 25 are each offset from each other to form the eccentricity, in the illustrated embodiment with a same eccentricity.
- bearings 26 are provided for supporting the drive section 26 of the eccentric shafts 25 below the machine base plate 12, while bearings 30 are arranged between the connection sections 27 of the eccentric shafts 25 and the connected connection areas 16 of the associated lower part 14 of each grinding bowl holder.
- a Mahlbecher 23 is placed on the central region 15 of the associated lower part 14 of a Mahlbecherhalterung 13 and clamped by the lower part 14 of Mahlbecherhalterung 13 spanning upper part 17 in Mahlbecherhalterung 13.
- the grinding cup 23 clamped horizontally in the attached grinding cup holder 13 moves on a circular path because the two are each in contact with an eccentric shaft 25 connected external terminal portions 16 of the Mahlbecherhalterung 13 itself each move on a circular path.
- the directions of movement of the two grinding bowls 23 are aligned on their associated orbits in each opposite direction of movement with simultaneously opposing motion phases such that when operating the ball mill 10 above the machine base plate 12 a mutual compensation the centrifugal forces in the grinding bowl holders 13 is realized with grinding bowls 23 clamped therein.
- each eccentric shaft 25 is additionally located in their located below the machine base plate 12 drive section 26 with a Provided counterweight 28, which is arranged on the above the machine base plate 12 located connecting portion 27 of the eccentric shaft 25 with connection portion 16 of Mahlbecherhalterung 13 with respect to the longitudinal axis of each eccentric shaft 25 opposite side.
- the two eccentric shafts 25 are formed as hollow-drilled shafts having an inner bore 31.
- cavities 32 are formed in each of the two opposing connection regions 16 and in the middle region 15 of the lower part 14 of each grinding bowl holder 13, said cavities being formed by using a sealing element 33 fixed to the upper end of each eccentric shaft 25 and a sealing surface 34 formed on the grinding bowl holder 13 Mating sealing element to the sealing element 33 are connected to the bores 31 of the two eccentric shafts 25.
- FIG. 3a a belonging to the invention drive concept is shown, in which a circumferential, driven by a drive pulley 40 toothed belt 39 for driving all four, to the two in FIGS. 1 and 2 described Mahlbecherhalterept 13 associated eccentric shafts 25 provides.
- the toothed belt 39 looped around the drive toothed disc 40 is guided over deflection pulleys 42 and wound outwardly around toothed disks 41 arranged at the ends of the eccentric shaft 25, the teeth 43 of the toothed belt 39 engaging in tooth spaces 44 of the toothed disks 41, respectively.
- a compensation game 38 is arranged on one of the two eccentric shafts 25 between eccentric shafts 25 and toothed belt 39.
- FIG. 3b results in one of the two toothed discs 41, the width of the tooth gaps 44 is greater than the width of the teeth 43 of the inserted toothed belt 39, so that the desired compensation game 38 results.
- Figure 3c at the other, the same Mahlbecherhalterung 13 associated eccentric shaft 25 a full engagement of the teeth 43 of the toothed belt 39 in the tooth gaps 44 of the associated toothed disk 41 before.
- the same configuration is realized in a manner not shown also in the two eccentric shafts 25 of the other Mahlbecherhalterung 13.
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- Crushing And Grinding (AREA)
- Adjustment And Processing Of Grains (AREA)
Description
Die Erfindung betrifft eine Kugelmühle mit einem wenigstens zwei auf einer Maschinengrundplatte angeordneten Mahlbecherhalterungen für jeweils einen darin in einer liegenden Anordnung eingespannten, stirnseitige Mahlbecherenden sowie eine Füllung von Kugeln als Mahlkörper aufweisenden Mahlbecher und mit einem eine Drehbewegung der Mahlbecherhalterungen herbeiführenden Antrieb.The invention relates to a ball mill with at least two Mahlbecherhalterungen arranged on a machine base plate for each clamped therein in a horizontal arrangement, end Mahlbecherenden and a filling of balls as Mahlkörper having Mahlbecher and with a rotational movement of the Mahlbecherhalterungen inducing drive.
Eine Kugelmühle mit den vorgenannten Merkmalen ist aus der
Soweit die beiden Mahlbecherhalterungen mit darin liegend angeordneten Mahlbechern auf einer gemeinsamen Maschinengrundplatte angeordnet sind, ist als Antrieb dafür u.a. ein Federmasseschwinger vorgeschlagen, mittels dessen die Maschinengrundplatte in eine umlaufende Kreisbewegung versetzt wird, so dass sich die beiden Mahlbecherhalterungen auf dieser Kreisbahn bewegen. Bei der bekannten Kugelmühle hat es sich dabei als nachteilig herausgestellt, dass die unter Einbeziehung des Federmasseschwingers erzeugte Kreisbewegung im Hinblick auf die sich im Inneren jedes Mahlbechers vollziehenden Bewegungsbahnen der Kugeln zu unbestimmt ist.As far as the two Mahlbecherhalterungen are arranged with lying therein Mahlbechern on a common machine base plate, u.a. proposed a Federmasseschwinger, by means of which the machine base plate is placed in a circulating circular motion, so that the two Mahlbecherhalterungen move on this circular path. In the known ball mill, it has been found to be disadvantageous that the circular motion generated with the involvement of Federmasseschwingers is too vague with respect to the carrying out in the interior of each Mahlbechers trajectories of the balls.
Der Erfindung liegt daher die Aufgabe zugrunde, eine Kugelmühle der eingangs genannten Bauart so zu verbessern, dass die Mahlbecher eine gerichtete und vorbestimmbare Kreisbewegung ausführen, damit sich ein sich exakt wiederholendes Bewegungsregime der Kugeln einstellt.The invention is therefore based on the object to improve a ball mill of the type mentioned so that the grinding bowls perform a directional and predeterminable circular motion, so that adjusts a precisely repeating movement regime of the balls.
Die Lösung dieser Aufgabe ergibt sich einschließlich vorteilhafter Ausgestaltungen und Weiterbildungen der Erfindung aus dem Inhalt der Patentansprüche, welche dieser Beschreibung nachgestellt sind.The solution to this problem arises, including advantageous refinements and developments of the invention from the content of the claims, which are adjusted to this description.
Die Erfindung sieht in ihrem Grundgedanken vor, dass jede der jeweils paarig angeordneten Mahlbecherhalterungen über zwei an sie jeweils auf bezüglich einer Symmetrieachse des Mahlbechers einander gegenüberliegenden Seiten angeschlossene Exzenterwellen mittels des Antriebes in eine parallel zur Ebene der Maschinengrundplatte ausgerichtete zwangsgeführte Kreisbewegung versetzt ist, wobei auf jeder der zwei die Maschinengrundplatte durchsetzenden, jeweils einer Mahlbecherhalterung zugeordneten Exzenterwellen unterhalb der Maschinengrundplatte ein Gegengewicht als Massenausgleich für die an der Exzenterwelle angeschlossene Mahlbecherhalterung mit darin eingespanntem Mahlbecher auf der bezüglich der Längsachse der Exzenterwelle dem Anschluss der Mahlbecherhalterung an die Exzenterwelle gegenüberliegenden Seite der Exzenterwelle angeordnet ist, und dass bei den beiden Mahlbecherhalterungen die Exzentrizitäten der beiden jeweils an sie angeschlossenen Exzenterwellen gleich sind, sowie deren Gegengewichte auf bezüglich der Längsachse der Mahlbecher einander gegenüberliegenden Seiten angeordnet sind und die Mahlbecherhalterungen über den Antrieb in eine jeweils gegenläufige und gegenphasige Kreisbewegung versetzt sind.The invention provides in its basic idea that each of the paired Mahlbecherhalterungen via two connected to it in each case with respect to an axis of symmetry of the Mahlbechers opposite sides eccentric waves is offset by means of the drive in a parallel to the plane of the machine base aligned positively driven circular motion, wherein on each the two machine base plate passing through, each associated with a Mahlbecherhalterung eccentric shafts below the machine base plate a counterweight as mass balance for the connected to the eccentric Mahlbecherhalterung with Mahlbecherhalter clamped therein on the relative to the longitudinal axis of the eccentric shaft to the connection of Mahlbecherhalterung to the eccentric shaft opposite side of the eccentric shaft is arranged and that in the two Mahlbecherhalterungen the eccentricities of the two connected to each eccentric shafts are the same, sow ie whose counterweights are arranged with respect to the longitudinal axis of the grinding bowls opposite sides and the Mahlbecherhalterungen are offset by the drive in a respective opposite and opposite phase circular motion.
Damit lässt sich ein Bewegungsregime einstellen, bei dem sich die Mahlbecher auf kleinen Kreisbahnen bewegen, wobei das Verhältnis von Kreisbahndurchmesser einerseits und Mahlbecherlänge andererseits so eingestellt ist, dass ein wesentlicher Teil der Zerkleinerungsarbeit im eingespannten Mahlbecher durch das Einschlagen von Mahlgut und Mahlkörpern an den Mahlbecherenden geleistet wird. Aus dem Einsatz von Exzenterwellen ergibt sich jedoch das Problem, dass im Betrieb der Kugelmühle erhebliche Unwuchtkräfte und Unwuchtmomente auftreten, für deren Kompensation Sorge zu tragen ist. Die Lösung, die in der Bewegungsebene der Mahlbecheraufnahme auftretenden Unwuchtkräfte durch die Anordnung von zwei Mahlbecherhalterungen zu kompensieren, die gegenläufig und gegenphasig angetrieben werden, ist im vorliegenden Fall nicht ausreichend. Denn aufgrund des Exzenterwellenantriebes treten auch Unwuchtmomente dadurch auf, dass die an den oberen Enden der Exzenterwellen angeschlossenen Mahlbecherhalterungen mit den darin eingespannten Mahlbechern entsprechende Drehmomente um eine im Zentrum zwischen den Mahlbecherhalterungen senkrecht auf der Ebene, in der sich die Mahlbecherhalterungen bewegen, stehenden Achse verursachen. Diese Drehmomente wechseln ihre Wirkrichtung in der Frequenz, in der die Mahlbecher rotieren und verursachen Drehschwingungen, die erfindungsgemäß durch einen zusätzlichen Massenausgleich auf jeder Exzenterwelle in ihrem unterhalb der Mahlbecherhalterung gelegenen Bereich kompensiert werden. Dazu ist jeweils ein Gegengewicht auf der Exzenterwelle angeordnet, welches auf der dem Anschluss der Mahlbecherhalterung an das obere Ende der zugeordneten Exzenterwelle bezüglich der Längsachse der Exzenterwelle gegenüberliegenden Seite der Exzenterwelle installiert ist. Zusätzliche Unwuchtmomente sind dadurch bedingt, dass die auf die an einem Ende einer Exzenterwelle angeordnete Mahlbecherhalterung wirkende Fliehkraft einerseits und die auf das am anderen Ende der Exzenterwelle angeordnete Gegengewicht wirkende Fliehkraft andererseits ein Drehmoment um horizontal verlaufende Achsen verursacht. Diese Unwuchtmomente rotieren mit der Drehung der Mahlbecher und der Gegengewichte um die Senkrechte auf der Ebene, in der sich die Mahlbecher bewegen.This makes it possible to set a movement regime in which the grinding bowls move on small circular paths, the ratio of circular path diameter on the one hand and Mahlbecherlänge on the other hand adjusted so that a significant part of the crushing work done in the clamped Mahlbecher by the hammering of ground material and grinding media to the Mahlbecherenden becomes. From the use of eccentric shafts, however, there is the problem that significant imbalance forces and unbalance moments occur during operation of the ball mill, for their compensation care must be taken. The solution to compensate for the imbalance forces occurring in the plane of movement of Mahlbecheraufnahme by the arrangement of two Mahlbecherhalterungen, which are driven in opposite directions and out of phase, is not sufficient in the present case. Because due to the Exzenterwellenantriebes occur also unbalance moments in that the Mahlbecherhalterungen connected to the upper ends of the eccentric shafts with the grinding bowls clamped therein cause corresponding torques about an axis in the center between the Mahlbecherhalterungen perpendicular to the plane in which move the Mahlbecherhalterungen, standing axis. These torques change their effective direction in the frequency in which the grinding bowls rotate and cause torsional vibrations, which are compensated according to the invention by an additional mass balance on each eccentric shaft in their located below the Mahlbecherhalterung area. For this purpose, in each case a counterweight is arranged on the eccentric shaft, which is installed on the opposite side of the eccentric shaft to the connection of the Mahlbecherhalterung to the upper end of the associated eccentric shaft with respect to the longitudinal axis of the eccentric shaft. Additional unbalance moments are caused by the fact that the centrifugal force acting on the Mahlbecherhalterung arranged on one end of an eccentric shaft on the one hand and the centrifugal force acting on the counterweight arranged on the other end of the eccentric shaft on the other hand causes a torque about horizontally extending axes. These unbalance moments rotate with the rotation of the grinding bowls and the counterweights about the vertical on the plane in which the grinding bowls move.
Erfindungsgemäß wird das räumliche Unwuchtproblem der gleichzeitigen Kompensation von Unwuchtkräften und Unwuchtmomenten dadurch gelöst, dass nicht allein die Unwuchtkräfte, die von einer rotierenden Mahlbecherhalterung verursacht werden, dadurch kompensiert werden, dass eine weitere exakt gegenläufig und gegenphasig angetriebene zweite Mahlbecherhalterung installiert wird, sondern darüber hinaus werden an den die Mahlbecherhalterungen in Rotation versetzenden Exzenterwellen Gegengewichte derart angebracht, dass die erst durch die in der Ebene der Mahlbecherhalterungen durch die Kompensation der Unwuchtkräfte aufgetretenen Unwuchtmomente ebenfalls kompensiert werden.According to the spatial unbalance problem of the simultaneous compensation of imbalance forces and unbalance moments is achieved in that not only the imbalance forces caused by a rotating Mahlbecherhalterung be compensated by the fact that another exactly opposite and antiphase driven second Mahlbecherhalterung is installed, but beyond attached to the Mahlbecherhalterungen in rotation eccentric eccentric shafts counterweights such that the first by the in the plane Mahlbecherhalterungen by the compensation of imbalance forces occurred unbalance moments are also compensated.
Im Rahmen der vorliegenden Erfindung ist die "liegende" Anordnung der Mahlbecher in gleicher Weise definiert wie in der gattungsbildenden WO 2009/ 026990 A1, nämlich als eine flach oder eine bis zu einem Winkel von 60 Grad mit der Horizontalen schräg liegende Anordnung.In the context of the present invention, the "lying" arrangement of the grinding bowls is defined in the same way as in the generic WO 2009/026990 A1, namely as a flat or inclined at an angle of 60 degrees with the horizontal arrangement.
Soweit sich die Erfindung grundsätzlich auf eine Anordnung von zwei Mahlbechern erstreckt, ist die Verwirklichung der Erfindung bei Ausgestaltungen mit einem einfachen Vielfachen von zwei Mahlbechern, beispielsweise mit vier oder sechs Mahlbechern, möglich.As far as the invention basically extends to an arrangement of two grinding bowls, the realization of the invention in embodiments with a simple multiple of two grinding bowls, for example with four or six grinding bowls, is possible.
Soweit erfindungsgemäß jede Mahlbecherhalterung an zwei Exzenterwellen angeschlossen ist, die bezüglich einer Symmetrieachse des eingespannten Mahlbechers auf einander gegenüberliegenden Seiten der Mahlbecherhalterung angeordnet sind, kann nach alternativen Ausführungsbeispielen der Erfindung vorgesehen sein, dass jede Mahlbecherhalterung an ihren bezüglich der Längsachse des Mahlbechers einander gegenüberliegenden Seiten an jeweils eine Exzenterwelle angeschlossen ist oder alternativ dass jede Mahlbecherhalterung im Bereich der beiden Stirnseiten des Mahlbechers an jeweils eine Exzenterwelle angeschlossen ist.As far as according to the invention each Mahlbecherhalterung is connected to two eccentric shafts, which are arranged with respect to an axis of symmetry of the clamped Mahlbechers on opposite sides of the Mahlbecherhalterung, can be provided for alternative embodiments of the invention that each Mahlbecherhalterung at their respect to the longitudinal axis of the Mahlbechers opposite sides of each an eccentric shaft is connected or alternatively that each Mahlbecherhalterung is connected in the region of the two end faces of the Mahlbechers to each eccentric shaft.
Nach einem Ausführungsbeispiel der Erfindung kann vorgesehen sein, dass jede Mahlbecherhalterung aus einem den Mahlbecher flach oder schräg liegend aufnehmenden und jeweils auf seinen bezüglich einer Symmetrieachse des Mahlbechers einander gegenüberliegenden Seiten mit den beiden Exzenterwellen verbundenen Unterteil sowie einem an dem Unterteil angelenkten und den Mahlbecher oben übergreifenden, mit dem Unterteil zusammenspannbaren Oberteil besteht.According to one embodiment of the invention can be provided that each Mahlbecherhalterung from a grinding bowl flat or obliquely receiving and each connected to its axis of symmetry of the Mahlbechers opposite sides connected to the two eccentric shaft base and a hinged to the lower part and the Mahlbecher above cross , with the lower part zusammenspannbaren upper part consists.
Bei Kugelmühlen allgemein ist weiterhin der für den Zerkleinerungsvorgang erforderliche Energieeintrag von Bedeutung insoweit, als er nicht zu einer unzulässigen Erwärmung des Mahlgutes führen darf. So kann im Rahmen einer Erwärmung des Mahlgutes beispielsweise bei einer Zerkleinerung von Kunststoff die Glasübergangs- bzw. die Erweichungstemperatur des Kunststoffes überschritten werden, was zu einem Verkleben bzw. Zusetzen im Mahlraum führen würde. Soweit demnach eine Kühlung des Mahlraumes bzw. der Mahlbecher wünschenswert ist, bietet der erfindungsgemäße Antrieb der beiden Mahlbecher über zugeordnete Exzenterwellen eine gute Möglichkeit, für eine entsprechende Kühlung der Mahlbecher zu sorgen. Im Einzelnen ist nach einem Ausführungsbeispiel der Erfindung vorgesehen, dass zur Einrichtung einer Kühlung des Mahlbechers während des Mahlvorganges die beiden jeweils mit einer Mahlbecherhalterung verbundenen Exzenterwellen einen hohlen Wellenkörper zur Durchleitung eines Kühlmittels aufweisen und die den Mahlbecher einspannende Mahlbecherhalterung dichtend an die beiden Exzenterwellen angeschlossen und mit sie durchsetzenden Hohlräumen ausgebildet ist, und dass die eine der Mahlbecherhalterung zugeordnete Exzenterwelle an einen Kühlmittelzulauf und die andere der Mahlbecherhalterung zugeordnete Exzenterwelle an einen Kühlmittelablauf angeschlossen ist.In ball mills in general, the energy input required for the comminution process is of importance insofar as it must not lead to an inadmissible heating of the ground material. Thus, as part of a heating of the ground material, for example, in a comminution of plastic, the glass transition or the softening temperature of the plastic are exceeded, which would lead to a sticking or clogging in the grinding chamber. Insofar as a cooling of the grinding chamber or Mahlbecher is desirable, the drive according to the invention of the two grinding bowls via associated eccentric shafts provides a good opportunity to provide for a corresponding cooling of the grinding bowl. Specifically, according to an embodiment of the invention, that for establishing a cooling of the Mahlbechers during the grinding process, the two each associated with a Mahlbecherhalterung eccentric shafts have a hollow shaft body for the passage of a coolant and connected to the Mahlbecher Mahlbecherhalterung sealingly connected to the two eccentric shafts and it is formed penetrating cavities, and that one of the grinding bowl holder associated eccentric shaft is connected to a coolant inlet and the other of the Mahlbecherhalterung associated eccentric shaft to a coolant outlet.
Hierbei kann weiterhin vorgesehen sein, dass das Unterteil der Mahlbecherhalterung in seinen die Enden der beiden Exzenterwellen jeweils umfassenden Anschlussbereichen sowie in seinem ein Auflager für den eingespannten Mahlbecher bildenden Mittelbereich jeweils mit Hohlräumen zur Durchleitung des Kühlmittels versehen ist, während weiterhin vorgesehen sein kann, dass das den Mahlbecher übergreifende Oberteil der Mahlbecherhalterung in seinem auf dem Mahlbecher aufliegenden Mittelteil mit wenigstens einem an die Hohlräume der Anschlussbereiche des Unterteils angeschlossenen Hohlraum zur Durchleitung des Kühlmittels versehen ist.It can further be provided that the lower part of Mahlbecherhalterung in its the ends of the two eccentric shafts respectively comprehensive connection areas and in its a support for the clamped Mahlbecher forming central region is provided in each case with cavities for the passage of the coolant, while still can be provided that the The upper part of the grinding bowl holder which engages over the grinding bowl is provided in its center part lying on the grinding bowl with at least one cavity connected to the cavities of the connecting regions of the lower part for the passage of the coolant.
Die vorstehend beschriebene Kühlung eines Mahlbechers bzw. einer Mahlbecherhalterung über durch die Exzenterwellen durchzuleitendes Kühlmittel lässt sich dabei bei allen Bauarten von Mühlen verwenden, bei denen als Antrieb Exzenterwellen zum Einsatz kommen bzw. kommen können. Insofern ist die Anwendung des vorstehend erläuterten Erfindungsgedankens nicht auf die Bauart einer Kugelmühle mit liegend angeordneten Mahlbechern beschränkt, sondern für alle Mühlen mit einem Exzenterwellen-Antrieb anwendbar.The above-described cooling of a grinding bowl or grinding bowl holder via coolant to be passed through the eccentric shafts can be used in all types of mills in which eccentric shafts are or can be used as the drive. In this respect, the application of the above-described inventive idea is not limited to the design of a ball mill with horizontally arranged grinding bowls, but applicable to all mills with an eccentric shaft drive.
Weiterhin kann vorgesehen sein, dass die Mahlbecherenden der flach oder schräg liegend eingespannten Mahlbecher eben ausgebildet sind, so dass sich beispielsweise bei einem einen kreisförmigen Querschnitt aufweisenden Mahlbecher eine zylindrische Ausbildung des Mahlbechers ergibt.Furthermore, it can be provided that the Mahlbecherenden the flat or obliquely clamped Mahlbecher are flat, so that, for example, in a circular cross-section having Mahlbecher results in a cylindrical design of the Mahlbechers.
Alternativ kann vorgesehen sein, dass die stirnseitigen Mahlbecherenden des Mahlbechers kalottenförmig ausgebildet sind.Alternatively, it can be provided that the end-face Mahlbecherenden the Mahlbechers are formed dome-shaped.
Soweit bei Verwirklichung der Erfindung anzustreben ist, die Massen von Mahlbechern und Halterungen einerseits und Exzenterwellen mit daran ausgebildeten Gegengewichten andererseits so groß auszulegen, dass eine Befüllung der Mahlbecher mit Mahlgut und gegebenenfalls mit Kugeln keine Auswirkungen auf die eingestellte Unwuchtkompensation der Kugelmühle hat, kann nach einem Ausführungsbeispiel der Erfindung jedoch auch vorgesehen sein, dass das an der Exzenterwelle unterhalb des Mahlbecherträgers angeordnete Gegengewicht in Abhängigkeit von der Masse der Halterung und des darin eingespannten Mahlbechers nachjustierbar ist. Im einfachsten Fall kann die Nachjustierung durch Anbringung von zusätzlichen Gewichten geschehen. Eine weitere Möglichkeit besteht in der radialen Verlagerung der Massenschwerpunkte der exzentrisch aufgenommenen Gegengewichte.As far as in the realization of the invention is to aim the masses of grinding bowls and brackets on the one hand and eccentric shafts with counterweights formed on the other hand so large that a filling of the grinding bowl with regrind and optionally with balls has no effect on the set imbalance compensation of the ball mill, can after a Embodiment of the invention, however, also be provided that the arranged on the eccentric shaft below the Mahlbecherträgers counterweight depending on the mass of the holder and the grinding bowl clamped therein is readjustable. In the simplest case, the readjustment can be done by attaching additional weights. Another possibility is the radial displacement of the center of gravity of the eccentrically recorded counterweights.
Im Rahmen der Erfindung ist der Einsatz von längserstreckten Mahlbechern sinnvoll, bei welchen die bei der Längserstreckung gegebene Länge und damit der Abstand zwischen den Mahlbecherenden jedenfalls größer ist als der Durchmesser des zwischen den Mahlbecherenden liegenden Bereichs. In diesem Rahmen sind bei Verwirklichung der Erfindung unterschiedliche Mahlbecherformen zweckmäßig. So kann vorgesehen sein, dass die jeweiligen Mahlbecher einen kreisförmigen Querschnitt oder einen elliptischen Querschnitt oder einen eckigen Querschnitt mit abgerundeten Eckbereichen haben, wobei bei letztgenanntem Ausführungsbeispiel die abgerundeten Eckbereiche des jeweiligen Mahlbechers bei Einsatz von Mahlkörpern in dem Mahlbecher einen Radius entsprechend dem Radius der Mahlkörper aufweisen können. Andere Mahlbecherformen sind ebenfalls möglich, beispielsweise Mahlbecher mit einem elliptischen Längsschnitt.In the context of the invention, the use of longitudinally extended grinding bowls makes sense in which the length given in the longitudinal extension and thus the distance between the grinding bowl ends is in any case greater than the diameter of the region lying between the grinding bowl ends. In this context, different Mahlbecherformen are useful in implementing the invention. Thus, it can be provided that the respective grinding bowls have a circular cross-section or an elliptical cross-section or a polygonal cross-section with rounded corner regions, wherein in the latter embodiment the rounded corner regions of the respective grinding bowl have a radius corresponding to the radius of the grinding bodies when grinding bodies are used in the grinding bowl can. Other Mahlbecherformen are also possible, for example grinding bowl with an elliptical longitudinal section.
Im Rahmen der Erfindung kann vorgesehen sein, dass die Exzentrizitäten der Verbindungen der Mahlbecherhalterung mit den beiden zugehörigen Exzenterwellen jeweils gleich groß bemessen sind, so dass sich damit eine Kreisbewegung der Mahlbecherhalterung mit eingespanntem Mahlbecher ergibt, wobei die Längsachsen der in unterschiedliche Mahlbecherhalterungen eingespannten Mahlbecher in allen Stellungen der Mahlbecher während ihres Umlaufs in einer parallelen Anordnung verbleiben.In the context of the invention it can be provided that the eccentricities of the compounds Mahlbecherhalterung with the two associated eccentric shafts are each sized equal, so that there is a circular movement Mahlbecherhalterung with clamped Mahlbecher, the longitudinal axes of the clamped in different Mahlbecherhalterungen grinding bowl in all Positions of Mahlbecher remain during their circulation in a parallel arrangement.
Alternativ kann vorgesehen sein, dass die Exzentrizitäten der Verbindungen der Mahlbecherhalterung mit den beiden zugehörigen Exzenterwellen unterschiedlich bemessen ist, so dass an dem einen an die die geringere Exzentrizität aufweisende Exzenterwelle angeschlossenen Anschlussbereich der Mahlbecherhalterung eine Kreisbewegung eingeleitet wird, während auf der gegenüberliegenden Seite der Mahlbecherhalterung die die größere Exzentrizität aufweisende Exzenterwelle zu einer Pendelbewegung des eingespannten Mahlbechers führt. Hierbei wird nur die eine Exzenterwelle mit der geringeren Exzentrizität angetrieben, während die andere Exzenterwelle mitgeführt wird.Alternatively, it may be provided that the eccentricities of the connections of the Mahlbecherhalterung with the two associated eccentric shafts is dimensioned differently, so that at the one connected to the lower eccentric eccentric shaft connected connection area of the Mahlbecherhalterung a circular motion is initiated, while on the opposite side of the Mahlbecherhalterung the the larger eccentric eccentric shaft leads to a pendulum movement of the clamped grinding bowl. Here, only the one eccentric shaft is driven with the lower eccentricity, while the other eccentric shaft is carried.
Soweit die beiden zu einer Mahlbecherhalterung zugehörigen Exzenterwellen mit ihrem einen Ende jeweils in einer festen Verbindung mit der zugehörigen Mahlbecherhalterung und damit auch miteinander in einer festen Verbindung stehen, ist aufgrund der Herstellungs- und Montagetoleranzen nicht gewährleistet, dass die mit einem Antriebsmedium, beispielsweise mit einem Zahnriemen oder einer Kette, zu verkoppelnden freien unteren Enden der Exzenterwellen jeweils in spannungsfreiem Eingriff mit dem gemeinsamen Antriebsmedium stehen, denn das System ist mechanisch überbestimmt. Um hier einem Verklemmen von Exzenterwellen und Antriebsmedium gegeneinander vorzubeugen, ist nach einem Ausführungsbeispiel der Erfindung vorgesehen, dass die beiden einer Mahlbecherhalterung zugeordneten Exzenterwellen von einem gemeinsamen Antriebsmedium angetrieben und an einer der beiden Exzenterwellen zwischen der Exzenterwelle und dem Antriebsmedium ein Ausgleichsspiel eingerichtet ist.As far as the two belonging to a Mahlbecherhalterung eccentric shafts with their one end in a fixed connection with the associated Mahlbecherhalterung and thus with each other in a solid connection, due to the manufacturing and assembly tolerances is not guaranteed that with a drive medium, for example with a Toothed belt or a chain, to be coupled free lower ends of the eccentric shafts are each in tension-free engagement with the common drive medium, because the system is mechanically overdetermined. To prevent jamming of eccentric shafts and drive medium against each other here is provided according to an embodiment of the invention, that the two of a Mahlbecherhalterung associated eccentric shafts driven by a common drive medium and a compensation game is set up on one of the two eccentric shafts between the eccentric shaft and the drive medium.
Hierzu kann im Einzelnen vorgesehen sein, dass am der Mahlbecherhalterung gegenüberliegenden Ende der Exzenterwellen jeweils eine Zahnscheibe angeordnet und das Antriebsmedium als umlaufender, mit der Verzahnung der Zahnscheibe kämmender Zahnriemen ausgebildet ist, wobei an einer der beiden Zahnscheiben zur Einrichtung des Ausgleichsspiels die Breite der Zahnlücken der Zahnscheibe größer ist als die Breite der Zähne des eingesetzten Zahnriemens. Dies gilt insbesondere, wenn alle Exzenterwellen der auf einer Maschinengrundplatte angeordneten Mahlbecherhalterungen von einem gemeinsamen Zahnriemen angetrieben sind, und insoweit ist in diesem Fall jeweils an der Zahnscheibe einer der beiden an dieselbe Mahlbecherhalterung angeschlossenen Exzenterwellen das Ausgleichsspiel eingerichtet.To this end, it may be provided in detail that arranged on the Mahlbecherhalterung opposite end of the eccentric shafts each a toothed disc and the drive medium is designed as a circumferential, meshing with the teeth of the toothed pulley toothed belt, wherein on one of the two toothed discs to the device of the compensation game, the width of the tooth gaps Toothed disc is larger than the width of the teeth of the inserted toothed belt. This is especially true if all the eccentric shafts of Mahlbrachhalterungen arranged on a machine base plate are driven by a common toothed belt, and insofar in this case the compensation game is set up in each case on the toothed disc one of the two connected to the same Mahlbecherhalterung eccentric.
In der Zeichnung ist ein Ausführungsbeispiel der Erfindung wiedergegeben, welches nachstehend beschrieben ist. Es zeigen:
- Fig. 1
- eine Kugelmühle mit zwei Mahlbecherhalterungen in einer perspektivischen Teilansicht,
- Fig. 2
- eine Mahlbecherhalterung mit einem darin eingespalteten Mahlbecher in einer schematisierten Seitenansicht,
- Fig. 3a-c
- eine Unteransicht der den beiden Mahlbecherhalterungen zugeordneten Exzenterwellen einschließlich Antriebsmedium.
- Fig. 1
- a ball mill with two Mahlbecherhalterungen in a partial perspective view,
- Fig. 2
- a Mahlbecherhalterung with a grinding bowl incorporated therein in a schematic side view,
- Fig. 3a-c
- a bottom view of the two Mahlbecherhalterungen associated eccentric shafts including drive medium.
Die zunächst aus
In dem Gehäuse 11 ist ein über die Maschinengrundplatte 12 nach oben hervorstehender Motor 21 angeordnet, der über einen unterhalb der Maschinengrundplatte 12 vorgesehenen Antriebsmechanismus die beiden auf der Maschinengrundplatte 12 angeordneten Mahlbecherhalterungen 13 antreibt.In the
Wie sich aus einer Zusammenschau der
Wie sich weiterhin aus
Werden die beiden Antriebsabschnitte 26 der beiden jeweils mit gleicher Exzentrizität ausgeführten Exzenterwellen 25 über den vom Motor 21 angetriebenen Antriebsmechanismus in Drehung versetzt, so bewegt sich der in der angeschlossenen Mahlbecherhalterung 13 liegend eingespannte Mahlbecher 23 auf einer Kreisbahn, weil sich die beiden jeweils an eine Exzenterwelle 25 angeschlossenen außenliegenden Anschlussbereiche 16 der Mahlbecherhalterung 13 selbst jeweils auf einer Kreisbahn bewegen. Soweit auf der Maschinengrundplatte 12 zwei Mahlbecherhalterungen 13 mit zugehörigen Mahlbechern 23 angeordnet sind, sind die Bewegungsrichtungen der beiden Mahlbecher 23 auf ihren zugehörigen Kreisbahnen in jeweils gegenläufiger Bewegungsrichtung mit gleichzeitig gegenläufigen Bewegungsphasen ausgerichtet derart, dass beim Betrieb der Kugelmühle 10 oberhalb der Maschinengrundplatte 12 ein gegenseitiger Ausgleich der Fliehkräfte bei den Mahlbecherhalterungen 13 mit darin eingespannten Mahlbechern 23 verwirklicht ist.If the two
Da durch diese Anordnung sich zwar die Fliehkräfte in der Ebene, in der die Mahlbecherhalterungen rotieren, gegenseitig kompensieren, jedoch Momente mit wechselnder Drehrichtung um eine Senkrechte auf dieser Ebene verbleiben, ist zusätzlich jede Exzenterwelle 25 in ihrem unterhalb der Maschinengrundplatte 12 gelegenen Antriebsabschnitt 26 mit einem Gegengewicht 28 versehen, welches auf der dem oberhalb der Maschinengrundplatte 12 befindlichen Anschlussabschnitt 27 der Exzenterwelle 25 mit Anschlussbereich 16 der Mahlbecherhalterung 13 bezüglich der Längsachse jeder einzelnen Exzenterwelle 25 gegenüberliegenden Seite angeordnet ist. Somit ist auch ein an jeder einzelnen Exzenterwelle 25 beim kreisförmigen Umlauf der daran angeschlossenen Mahlbecherhalterung 13 wirksamer Kraftausgleich verwirklicht, der aufgrund der Tatsache, dass zwei gegenläufig und gegenphasig angetriebene Mahlbecherhalterungen 13 mitsamt der angeschlossenen Exzenterwellen 25 in gleicher Weise aufgebaut sind, gleichzeitig das oben beschriebene Moment um die Senkrechte auf der Ebene, auf der die Mahlbecherhalterungen 13 rotieren, kompensiert und jene Momente um Achsen, die in dieser Ebene liegen und die zunächst dadurch zustande kommen, dass die Fliehkräfte der Mahlbecherhalterungen 13 und der Gegengewichte 28 diese Momente erzeugen.Since this arrangement, although the centrifugal forces in the plane in which the Mahlbecherhalterungen rotate compensate each other, but remain moments with changing direction around a vertical plane on this level, each
Um eine Kühlung des Mahlbechers 23 während des Betriebs der Kugelmühle einzurichten, sind die beiden Exzenterwellen 25 als hohlgebohrte Wellen mit einer inneren Bohrung 31 ausgebildet. Entsprechend sind in den beiden einander gegenüberliegenden Anschlussbereichen 16 sowie in dem diese verbindenden Mittelbereich 15 des Unterteils 14 jeder Mahlbecherhalterung 13 jeweils Hohlräume 32 ausgebildet, die unter Heranziehung eines am oberen Ende jeder Exzenterwelle 25 fixierten Dichtungselementes 33 und einer an der Mahlbecherhalterung 13 ausgebildeten Dichtfläche 34 als Gegendichtungselement zum Dichtungselement 33 an die Bohrungen 31 der beiden Exzenterwellen 25 angeschlossen sind. Somit kann ein in die eine der beiden Exzenterwellen 25 eingeleitetes gasförmiges oder flüssiges Kühlmedium über die zugeordnete Exzenterwelle 25 und die in dem Unterteil 14 ausgebildeten Hohlräume 32 bis in die gegenüberliegend an die Mahlbecherhalterung 13 angeschlossene Exzenterwelle 25 strömen und in dieser Exzenterwelle auch abströmen. Entsprechend ist bei dem dargestellten Ausführungsbeispiel an dem unteren Ende der linken Exzenterwelle 25 ein Kühlmittelzulauf 36 und an dem unteren Ende der rechten Exzenterwelle 25 ein Kühlmittelablauf 37 ausgebildet. Durch eine entsprechende Ausbildung des Mittelbereichs 22 des Oberteils 17 jeder Mahlbecherhalterung 13 mit der Ausbildung eines Hohlraumes 35 darin und dessen Anschluss an die Hohlräume 32 des Unterteils 14 ist dafür Sorge getragen, dass auch das Oberteil 17 jeder Halterung 13 von dem in das Unterteil 14 der Mahlbecherhalterung eingeleiteten Kühlmittel durchströmt ist. Auf diese Weise ist der Mahlbecher 23 von gekühlten Bauteilen eingeschlossen, so dass das im Mahlbecher 23 beim Zerkleinerungsvorgang entstehende Temperaturniveau begrenzt werden kann.In order to establish a cooling of the grinding
In
Die in der vorstehenden Beschreibung, den Patentansprüchen, der Zusammenfassung und der Zeichnung offenbarten Merkmale des Gegenstandes dieser Unterlagen können einzeln als auch in beliebigen Kombinationen untereinander für die Verwirklichung der Erfindung in ihren verschiedenen Ausführungsformen wesentlich sein.The features disclosed in the foregoing description, the claims, the abstract and the drawings of the subject matter of these documents may be essential individually as well as in any combination with each other for the realization of the invention in its various embodiments.
Claims (14)
- Ball mill (10) with at least two grinding bowl holders (13) arranged on a machine base (12) for clamping grinding bowl ends frontally in a horizontal arrangement, as well as a grinding bowl (23) to be filled with balls as grinding media, and with a drive inducing a rotational movement of the grinding bowl holders (13), characterised in that each of the grinding bowl holders (13) arranged in pairs is offset in force-guided circular motion parallel to the machine base by means of a drive via two eccentric shafts (25) connected respectively on opposite sides of a symmetry axis of the grinding bowl (23), wherein a counterweight (28) is arranged underneath the machine base (12) on each of the two eccentric shafts (25) passing through the machine base (12) and respectively coordinated with a grinding bowl holder (13), wherein the counterweight (28) serves as a mass balance for the grinding bowl holder (13) connected to the eccentric shafts (25) with the grinding bowl (23) clamped therein, and arranged on the side of the eccentric shaft (25) lying opposite the connection to the eccentric shaft (25) of the grinding bowl holder (13) with respect to the longitudinal axis of the eccentric shaft (25), and that the eccentricities of the two eccentric shafts (25) respectively connected to the two grinding bowl holders (13) are equal, while their counter-weights (28) are arranged on opposite sides with respect to the longitudinal axis of the grinding bowl (23) and grinding bowl holder (13), and the drives are offset in a respective counter-rotating and anti-phase circular motion.
- Ball mill according to claim 1, characterised in that more than two grinding bowl holders (13) are arranged on the machine base (12) with associated eccentric shaft drives respectively arranged in a plurality of pairs.
- Ball mill according to claim 1 or 2, characterised in that each grinding bowl holder (13) is connected to an eccentric shaft (25) on respective opposite sides of the longitudinal axis of the grinding bowl (23).
- Ball mill according to claim 1 or 2, characterised in that each grinding bowl (13) is connected to a respective eccentric shaft (25) in the region of the two ends of the grinding bowl (23).
- Ball mill according to one of the claims 1 to 4, characterised in that each grinding bowl holder (13) comprises a flat or sloping receiving lower part (14) connected to the grinding bowl (23) and the two eccentric shafts (25), as well as a upper part (17) that is jointly clampable with the lower part (14) and is hinged to the lower part (14) and the top upper ends clamping the grinding bowl (23).
- Ball mill according to one of the claims 1 to 5, characterised in that the two eccentric shafts (25) connected to a grinding bowl (13) each have a hollow shaft body for passing a coolant to cool the grinding bowl (23) during the grinding process, while the grinding bowl holder (13) clamping the grinding bowl (23) is sealingly connected to the two eccentric shafts (25) to form cavities (32, 35) passing through them, and that one of the eccentric shafts (25) coordinated with the grinding bowl holder (13) is connected to a coolant supply (36) while the other eccentric shaft (25) coordinated with the grinding bowl holder (13) is connected with a coolant outlet (37).
- Ball mill according to claim 6, characterised in that the lower part (14) of the grinding bowl holder (13) is provided with cavities (32) for passing the coolant in the connection regions (16) comprising the ends of the two eccentric shafts (25) as well as in the central region (15) for the clamped grinding bowl (23).
- Ball mill according to claim 6 or 7, characterised in that the upper part (17) of the grinding bowl holder (13) overlapping the grtinding bowl (23) is provided on its central part (22) lying on the grinding bowl (23) with a cavity (35) that is connected to at least one of the cavities (32) of the connection regions (16) of the lower part (14) for the passage of the coolant.
- Ball mill according to one of the claims 1 to 8, characterised in that a counterweight (28) on the eccentric shaft (25) below the grinding bowl holder (13) is adjustable as a function of the weight of the grinding bowl holder (13) and the grinding bowl (23) clamped therein.
- Ball mill according to one of the claims 1 to 9, characterised in that the grinding bowl ends of the flat or sloping grinding bowl (23) clamped in a grinding bowl holder (13) are flat.
- Ball mill according to one of the claims 1 to 9, characterised in that the grinding bowl ends of the flat or sloping grinding bowl (23) clamped in a grinding bowl holder (13) are spherical.
- Ball mill according to one of the claims 1 to 11, characterised in that the two eccentric shafts (25) coordinated with a grinding bowl (13) are driven by a common drive medium (39), and a compensation clearance (38) is established between the eccentric shaft (25) and the drive medium (39) at one of the two eccentric shafts (25).
- Ball mill according to claim 12, characterised in that a toothed disc (41) is arranged on the ends of each of the eccentric shafts (25) opposite the grinding bowl holder (13), and the drive medium (39) is formed as a circumferential toothed belt that meshes with the toothing of the toothed disc (41), wherein, in order to establish the compensation clearance (38), on one of the two toothed discs (41) the width of the tooth gaps (44) of the toothed discs (41) is greater than the width of the teeth (43) of the toothed belt.
- Ball mill according to claim 13, characterised in that all the eccentric shafts (25) on a grinding bowl holder (13) arranged on a machine base (12) are driven by a common drive medium, and are respectively connected to one of the two eccentric shafts (25) on the same grinding bowl holder (13) in order to establish the compensation clearance (38).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE102012105217 | 2012-06-15 | ||
PCT/EP2013/062402 WO2013186372A1 (en) | 2012-06-15 | 2013-06-14 | Ball mill having spatial unbalance compensation |
Publications (2)
Publication Number | Publication Date |
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EP2861350A1 EP2861350A1 (en) | 2015-04-22 |
EP2861350B1 true EP2861350B1 (en) | 2016-03-23 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP13731070.2A Active EP2861350B1 (en) | 2012-06-15 | 2013-06-14 | Ball mill with spatial imbalance compensation |
Country Status (7)
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US (1) | US10058871B2 (en) |
EP (1) | EP2861350B1 (en) |
JP (1) | JP5979694B2 (en) |
CN (1) | CN104470637B (en) |
IN (1) | IN2014DN10579A (en) |
RU (1) | RU2592854C9 (en) |
WO (1) | WO2013186372A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102019126162A1 (en) * | 2019-01-16 | 2020-07-16 | Retsch Gmbh | Ball mill |
CN113727779A (en) * | 2019-02-26 | 2021-11-30 | 斯佩克斯样品加工有限责任公司 | Homogenizer and method for grinding a large number of samples |
DE102020101523A1 (en) * | 2019-09-06 | 2021-03-11 | Retsch Gmbh | Laboratory vibrating mill |
RU2760394C1 (en) * | 2020-11-23 | 2021-11-24 | Федеральное государственное бюджетное образовательное учреждение высшего образования «Пензенский государственный университет» (ФГБОУ ВО «Пензенский государственный университет») | Method for grinding materials in a centrifugal planetary mill |
Family Cites Families (24)
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US459662A (en) * | 1891-09-15 | Water-heating attachment for ranges | ||
US1831049A (en) * | 1929-11-02 | 1931-11-10 | Smidth & Co As F L | Grinding mill |
US1951823A (en) * | 1930-04-07 | 1934-03-20 | Walter P Eppers | Grinding mill |
US2729110A (en) * | 1953-05-07 | 1956-01-03 | Automatic Steel Products Inc | Sheet metal pulley construction for tooth grip belts |
FR1084223A (en) * | 1953-05-28 | 1955-01-18 | Ct D Etudes Et De Rech S De L | Ball mill |
US3286939A (en) * | 1963-11-26 | 1966-11-22 | Glidden Co | Vibratory ball mill |
GB1234018A (en) * | 1970-04-16 | 1971-06-03 | ||
DE2219753A1 (en) * | 1972-04-21 | 1973-10-31 | Gaemmerler Hagen | VIBRATING MILL FOR GRINDING SOLID BODIES, ESPECIALLY FINE STONE |
SU727227A1 (en) * | 1975-10-01 | 1980-04-15 | Mironov Anatolij A | Fine disintegrating apparatus |
SU822893A1 (en) * | 1979-07-02 | 1981-04-23 | Комплексная Экспедиция Всесоюзногонаучно-Исследовательского Институтаминерального Сырья | Laboratory vibration-type mill |
SU1502101A1 (en) * | 1987-01-19 | 1989-08-23 | Институт Геотехнической Механики Ан Усср | Tumbling barrel |
JP2586778B2 (en) * | 1992-06-30 | 1997-03-05 | 株式会社栗本鐵工所 | Batch type planetary ball mill with temperature control |
CN2157828Y (en) * | 1993-07-06 | 1994-03-02 | 赵德林 | Mills for ceratine and mineral traditional Chinese medicines |
JPH10314568A (en) * | 1997-05-16 | 1998-12-02 | Dainippon Seiki:Kk | Rotating shaker |
DE19712905C2 (en) * | 1997-03-27 | 2003-11-06 | Fritsch Gmbh Laborgeraetebau | Planetary ball mill |
US6086242A (en) * | 1998-02-27 | 2000-07-11 | University Of Utah | Dual drive planetary mill |
US6126097A (en) * | 1999-08-21 | 2000-10-03 | Nanotek Instruments, Inc. | High-energy planetary ball milling apparatus and method for the preparation of nanometer-sized powders |
US6334583B1 (en) * | 2000-02-25 | 2002-01-01 | Hui Li | Planetary high-energy ball mill and a milling method |
JP4672353B2 (en) * | 2004-10-29 | 2011-04-20 | 三ツ星ベルト株式会社 | Toothed belt drive |
JP5179079B2 (en) * | 2006-10-25 | 2013-04-10 | 株式会社アーステクニカ | Vibration mill and vibration grinding method of vibration mill |
US7744027B2 (en) * | 2007-02-15 | 2010-06-29 | Nagao System Inc. | Planetary ball mill |
JP2008290025A (en) * | 2007-05-25 | 2008-12-04 | Chuo Kakoki Kk | Pulverization method of woody material |
EP2170518B1 (en) * | 2007-07-14 | 2015-09-09 | Retsch GmbH | Laboratory vibration grinding mill having inclined grinding beakers |
US8162246B2 (en) * | 2009-03-03 | 2012-04-24 | Randall Long | Multiple safety element torque limiter |
-
2013
- 2013-06-14 WO PCT/EP2013/062402 patent/WO2013186372A1/en active Application Filing
- 2013-06-14 JP JP2015516635A patent/JP5979694B2/en active Active
- 2013-06-14 US US14/406,582 patent/US10058871B2/en active Active
- 2013-06-14 EP EP13731070.2A patent/EP2861350B1/en active Active
- 2013-06-14 RU RU2014149573/13A patent/RU2592854C9/en not_active IP Right Cessation
- 2013-06-14 IN IN10579DEN2014 patent/IN2014DN10579A/en unknown
- 2013-06-14 CN CN201380031395.5A patent/CN104470637B/en active Active
Also Published As
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US20150129692A1 (en) | 2015-05-14 |
CN104470637B (en) | 2016-12-21 |
RU2592854C9 (en) | 2016-12-20 |
RU2592854C1 (en) | 2016-07-27 |
EP2861350A1 (en) | 2015-04-22 |
US10058871B2 (en) | 2018-08-28 |
JP5979694B2 (en) | 2016-08-24 |
JP2015519198A (en) | 2015-07-09 |
WO2013186372A1 (en) | 2013-12-19 |
CN104470637A (en) | 2015-03-25 |
IN2014DN10579A (en) | 2015-08-28 |
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