EP2361687B1 - Method for manufacturing a tube mill - Google Patents
Method for manufacturing a tube mill Download PDFInfo
- Publication number
- EP2361687B1 EP2361687B1 EP10193498A EP10193498A EP2361687B1 EP 2361687 B1 EP2361687 B1 EP 2361687B1 EP 10193498 A EP10193498 A EP 10193498A EP 10193498 A EP10193498 A EP 10193498A EP 2361687 B1 EP2361687 B1 EP 2361687B1
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- European Patent Office
- Prior art keywords
- slotted
- slotted plates
- plate
- plates
- slots
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- B02C17/06—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 several compartments
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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
- B02C17/183—Feeding or discharging devices
- B02C17/1835—Discharging devices combined with sorting or separating of material
- B02C17/1855—Discharging devices combined with sorting or separating of material with separator defining termination of crushing zone, e.g. screen denying egress of oversize material
Definitions
- the invention relates to a method for producing a tube mill, equipped with at least one intermediate or discharge wall, preferably a plurality of intermediate walls, which are equipped with a plurality of slotted plates. Furthermore, the invention relates to a slot plate and a tube mill, which are produced by this method. An example of this is from the DE 19638698 A1 known.
- Tube mills serve to shred lumpy material and are used, for example, in cement production.
- this has at least two grinding chambers, which are separated by an intermediate wall, one being used as a coarse grinding chamber and the other as a fine grinding chamber.
- grinding balls are provided, which perform the crushing work.
- the intermediate wall is provided with a plurality of slit plates, which allow shredded material from the coarse grinding chamber enters the fine grinding chamber.
- the slit plates are designed so that they pass the sufficiently shredded material while the grinding balls are retained.
- slotted plates Due to the material to be crushed and the grinding balls, the slotted plates are exposed to a very large stress and must therefore be designed to wear resistant. The production of slotted plates is therefore associated with a lot of effort.
- slotted plates for tube mills are manufactured according to two different manufacturing processes, on the one hand the production by rolled steel and on the other hand the production by a casting process are used.
- a major disadvantage of this method is that the original structure of the starting material is changed by the oxy-fuel cuts and must be readjusted by the subsequent annealing process (hardening + annealing) for each plate.
- the subsequent annealing process hardening + annealing
- the slotted plates thus no consistent structure over the entire slotted plate delivery can be guaranteed, as it may come through different processes to inequalities. These processes may include a non-uniform temperature of quench media for curing, a non-uniform hardening temperature, and a non-uniform precaution to prevent over-hardening of the mounting holes.
- the hardening depth is limited so that only plate thicknesses of max. 50 mm can be used.
- slotted plates are made symmetrical to avoid excessive distortion of the plates during curing. If plate distortions nevertheless exist, they can lead to considerable tension when installing the slotted plates, as the screw connections must be tightened to a minimum torque in order to avoid screw loosening during operation.
- a mill separation wall which consists of circular segment-like partition plates, which are fastened by means of terminal strips to a wall scaffold, wherein the partition wall plates have formed by burnout Kantenauslangisme.
- a plate described as armor or wearing part for a screw flight are cut out in the production of a coated metallic carrier sub-segments by means of water jet cutting.
- the invention is therefore based on the object of specifying a new method for producing a tube mill with an existing of a plurality of slotted intermediate or discharge wall, with the production of slotted plates is characterized by a consistent structure of the entire slotted plate delivery and allows a variable design.
- According to the invention can be made of plate material, which is produced directly in the steelworks under optimal, always consistent and constantly monitored conditions of a production line (including hardening). As a result, the material properties are documented and proven for all batches. Uncertainties regarding the structure can thus be virtually ruled out.
- the slit plates are provided with slots arranged asymmetrically to the longitudinal central axis of the slit plate. Furthermore, some of the slit plates can be made with slits having different distances from each other. It is also conceivable that more slots per plate can be provided, which would improve the function of the intermediate or discharge wall.
- the desired hardness of the slotted plates can be set very precisely by selecting a suitable starting material with the desired hardness.
- the method is nearly independent of plate thickness.
- plates with at least 40 mm to, for example, 100 mm can now be realized.
- the service life of the slotted plates can be influenced accordingly positive.
- the material is insensitive to breakage, especially in the field of mounting holes. This allows an optimized execution of the plate attachment.
- a plurality of mounting holes formed as through holes can be drilled in the slotted plates, which are provided with an enlarged diameter blind bore.
- the invention further relates to a slit plate produced by the method described above, and to a ball mill having an intermediate or discharge wall consisting of a multiplicity of such slotted plates.
- tube mill 1 consists essentially of a coarse grinding chamber 2 and a fine grinding chamber 3, which are separated by an intermediate wall 4 from each other.
- the intermediate wall 4 has a support frame 6 and a plurality of slot plates 5 attached thereto.
- a discharge device 8 is provided with a discharge wall 8a.
- the tube mill 1 has a cylindrical outer wall and is suitably rotatably mounted in bearings 9 and 10 about an axis 11. Both grinding chambers 2, 3 are charged with suitable grinding balls, wherein the material supplied via a feed device 7 is first comminuted in the coarse grinding chamber 2. The sufficiently comminuted material passes through the slotted plates 5 in the fine grinding chamber 3 to be further crushed there. About the discharge wall 8a and the discharge 8, the ground material is discharged.
- the intermediate wall 4 and the discharge wall 8a may be constructed similarly, so that the formation of the slotted plates will be explained below only with reference to the intermediate wall 4.
- Fig. 2 shows a segment of the intermediate wall 4, as it is seen from the view of the coarse grinding chamber 2.
- the plurality of slit plates 5 are arranged concentrically about the axis 11 and cover substantially the entire intermediate wall. There are only in the middle no slotted plates provided. This area can be used as a passage for an air flow.
- Each mounted slotted plate is defined by two radially aligned side edges and upper and lower arcuate boundary edges.
- the Outer contour is formed symmetrically with respect to a (radially aligned) longitudinal central axis 5b.
- the slit plate is further provided with a plurality of slits 5a, each terminating at a distance from the lateral boundary edges and are preferably aligned perpendicular to the longitudinal central axis 5b.
- a corresponding segment of the support frame 6 is off Fig. 3
- the support frame 6 is used for fastening the slotted plates 5 and has in the region of each slit plate 5 has a recess 6a which is formed so that in the view according to FIG Fig. 3 all slots 5a of the slot plate 5 mounted on the other side are visible.
- the contour of the recess 6a of the support frame 6 is adapted to the procedural sequence in the tube mill.
- the recesses 6a and the associated slotted plates 5 are arranged on three circular rings arranged concentrically with each other, wherein the contours of the recesses 6a and the slot arrangement of the associated slotted plates 5 differ from each other in the various circular arrays. Even in a certain annulus are always two adjacent recesses 6a and the associated slot arrangement of the slotted plates 5 arranged in mirror image to each other.
- the slotted plates 5 are usually screwed to the support frame 6.
- the slotted plates 5 are provided with corresponding through-holes 5 c, which according to the enlarged view of the slot according to Fig. 4 additionally provided with an enlarged diameter blind bore 5d.
- holes 6b are provided at the appropriate location, so that the slotted plates can be fixed with suitable screws / nuts on the support frame.
- the blind bores 5d allow a secure hold of the slotted plates and, on the other hand, prevent the screw head from protruding beyond the slot wall and being exposed to wear.
- a suitable, cured plate material is first selected as the starting material.
- the starting material is selected immediately in the hardness desired for the finished slit plates. For this example, wear plates with a hardness of at least 500HV into consideration.
- the outer contour of the slit plates 5 and the slits 5a are cut by means of a non-thermal cutting method, in particular by means of a water jet.
- the slots may also extend asymmetrically with respect to the longitudinal central axis 5b, as is apparent from most of the in FIGS Fig. 2 shown slotted plates immediately apparent.
- the recesses 6a have always been designed to be optimized in terms of process engineering and, for most slotted plates, have an asymmetrical contour relative to the longitudinal central axis 5b. As a result, part of the slots would not have been released through the recesses in the past and would therefore be unnecessarily longer.
- the new method according to which no consideration has to be given to any symmetries, it is possible to adapt the slots directly to the recesses of the support frame, thus avoiding unnecessarily long cuts.
- a further advantage of the non-thermal cutting method is that the slots 5a of a slotted plate can also be arranged at different distances from each other and thus designed optimized in terms of process technology can be. The different distances are particularly evident in the radially arranged at the center slotted plates.
- the plate thickness of the slotted plates has a decisive influence on the service life of the slotted plates. Thicker plates thus have a longer life before they have to be replaced. Due to the required in the previous manufacturing process subsequent curing process, the thickness was limited to about 50mm. Now also plate material with thicknesses of 40 to 100mm or even more can be used.
- the new manufacturing process is thus characterized by greater freedom in the arrangement and design of the slots.
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
- Polishing Bodies And Polishing Tools (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Herstellung einer Rohrmühle, ausgestattet mit wenigstens einer Zwischen- oder Austragswand, vorzugsweise mehreren Zwischenwänden, die mit einer Vielzahl von Schlitzplatten bestückt sind. Weiterhin betrifft die Erfindung eine Schlitzplatte sowie eine Rohrmühle, die nach diesem Verfahren hergestellt sind. Ein Beispiel hierfür ist aus der
Rohrmühlen dienen zur Zerkleinerung von stückigem Material und werden beispielsweise bei der Zementherstellung eingesetzt. In einer oft verwendeten Ausgestaltung der Rohrmühle weist diese wenigstens zwei Mahlkammern auf, die durch eine Zwischenwand voneinander getrennt sind, wobei die eine als Grobmahlkammer und die andere als Feinmahlkammer verwendet wird. In den beiden Mahlkammern sind Mahlkugeln vorgesehen, welche die Zerkleinerungsarbeit ausführen. Die Zwischenwand ist mit einer Vielzahl von Schlitzplatten versehen, die es ermöglichen, dass zerkleinertes Material aus der Grobmahlkammer in die Feinmahlkammer gelangt. Die Schlitzplatten sind dabei so ausgestaltet, dass sie das genügend zerkleinerte Material passieren lassen, während die Mahlkugeln zurückgehalten werden.Tube mills serve to shred lumpy material and are used, for example, in cement production. In an often used embodiment of the tube mill, this has at least two grinding chambers, which are separated by an intermediate wall, one being used as a coarse grinding chamber and the other as a fine grinding chamber. In the two grinding chambers grinding balls are provided, which perform the crushing work. The intermediate wall is provided with a plurality of slit plates, which allow shredded material from the coarse grinding chamber enters the fine grinding chamber. The slit plates are designed so that they pass the sufficiently shredded material while the grinding balls are retained.
Durch das zu zerkleinernde Material und die Mahlkugeln sind die Schlitzplatten einer sehr großen Beanspruchung ausgesetzt und müssen daher entsprechend verschleißfest ausgebildet werden. Die Herstellung der Schlitzplatten ist daher auch mit einem hohen Aufwand verbunden.Due to the material to be crushed and the grinding balls, the slotted plates are exposed to a very large stress and must therefore be designed to wear resistant. The production of slotted plates is therefore associated with a lot of effort.
Derzeit werden Schlitzplatten für Rohrmühlen nach zwei verschiedenen Herstellungsverfahren gefertigt, wobei einerseits die Herstellung durch Walzstahl und andererseits die Herstellung durch ein Gussverfahren zur Anwendung kommen.Currently slotted plates for tube mills are manufactured according to two different manufacturing processes, on the one hand the production by rolled steel and on the other hand the production by a casting process are used.
Bei der Herstellung durch Walzstahl werden zunächst durch Sonderwalzung hergestellte Bleche ausgewählt, geprüft und über einen Autogenbrennschnitt konfektioniert. Anschließend werden die Schlitze auf einem Bearbeitungszentrum vorgefräst, um danach eine konkrete Erkennung für den konischen, CNC-gesteuerten Hauptschlitz (Autogenbrennschnitt) zu erlangen. Nach dieser Bearbeitung wird die Platte einer Zwischenkontrolle unterzogen und für den Härtevorgang gesäubert. Durch Vorverformung muss dem beim Härtevorgang auftretenden Plattenverzug entgegengetreten werden, sodass die Verzüge in einem noch akzeptablen Bereich liegen. Der Härtevorgang Bedarf insbesondere auch Vorkehrungen im Bereich der Befestigungsbohrungen um eine "Überhärtung" zu vermeiden. Nach dem Härten ist ein erneutes Anlassen erforderlich, um die Platte für den praktischen Gebrauch einzustellen.In the production by rolled steel, first produced by special rolling plates are selected, tested and an autogenous incision assembled. Subsequently, the slots are pre-milled on a machining center, in order to then obtain a concrete recognition for the conical, CNC-controlled main slot (oxy-fuel cutting). After this processing, the plate is subjected to an intermediate inspection and cleaned for the hardening process. Pre-forming must counteract the plate distortion that occurs during the hardening process so that the distortion is within an acceptable range. The hardening process requires in particular also precautions in the area of the fixing holes in order to avoid a "over hardening". After hardening, re-tempering is required to set the plate for practical use.
Ein großer Nachteil dieses Verfahrens besteht darin, dass das Originalgefüge des Ausgangsmaterial durch die Autogenbrennschnitte verändert wird und durch den nachträglichen Vergütungsprozess (Härten + Anlassen) für jede Platte neu eingestellt werden muss. Für die Schlitzplatten kann somit kein gleichbleibendes Gefüge über die gesamte Schlitzplattenlieferung garantiert werden, da es durch verschiedene Prozesse zu Ungleichheiten kommen kann. Diese Prozesse können in einer ungleichmäßigen Temperatur des Abschreckmediums für die Härtung, einer ungleichmäßigen Härtetemperatur sowie einer ungleichmäßigen Vorkehrung, um eine Überhärtung der Befestigungsbohrungen zu vermeiden, bestehen. Des Weiteren ist die Einhärttiefe limitiert, sodass nur Plattenstärken von max. 50 mm verwendet werden können.A major disadvantage of this method is that the original structure of the starting material is changed by the oxy-fuel cuts and must be readjusted by the subsequent annealing process (hardening + annealing) for each plate. For the slotted plates thus no consistent structure over the entire slotted plate delivery can be guaranteed, as it may come through different processes to inequalities. These processes may include a non-uniform temperature of quench media for curing, a non-uniform hardening temperature, and a non-uniform precaution to prevent over-hardening of the mounting holes. Furthermore, the hardening depth is limited so that only plate thicknesses of max. 50 mm can be used.
Ein weiterer Nachteil dieses Verfahrens ist in der Begrenzung der Schlitzanordnung zu sehen. Bedingt durch den Härtevorgang sind Mindestabstände der Schlitze zueinander vorgeschrieben, um ein späteres Brechen der Platten auszuschließen. Außerdem müssen immer gleiche Abstände der Schlitze zueinander und auch zu den Rändern eingehalten werden, um unterschiedliche Härtungstiefen der Schlitzstege zu vermeiden. Würde man den Abstand der Schlitze zueinander stark variieren, würden die schmäleren Stege durch eine Überhärtung im Betrieb brechen.Another disadvantage of this method is seen in the limitation of the slot arrangement. Due to the hardening process minimum distances of the slots are prescribed to each other in order to preclude a later breaking of the plates. In addition, always equal distances of the slots to each other and to the edges must be adhered to in order to avoid different depths of hardening of the slot webs. If the distance of the slots from one another were to vary greatly, the narrower webs would break during overheating during operation.
Des Weiteren ist es erforderlich, dass die Schlitzplatten symmetrisch hergestellt werden, um einen übermäßigen Verzug der Platten beim Härten zu vermeiden. Sind dennoch Plattenverzüge vorhanden, können diese beim Einbau der Schlitzplatten zu erheblichen Verspannungen führen, da die Verschraubungen auf ein Mindestmoment angezogen werden müssen, um ein Schraubenlösen während des Betriebes zu vermeiden.Furthermore, it is necessary that the slotted plates are made symmetrical to avoid excessive distortion of the plates during curing. If plate distortions nevertheless exist, they can lead to considerable tension when installing the slotted plates, as the screw connections must be tightened to a minimum torque in order to avoid screw loosening during operation.
Alternativ wenden daher viele die Herstellung durch ein Gussverfahren an. Dieses Verfahren erfordert jedoch, dass für jede Schlitzplatte ein Gussmodell und die geeignete Schmelze bereitgestellt werden muss. Nach dem Gießvorgang muss die Platte gesäubert, Angussflächen entfernt und auf Risse überprüft werden. Auch das Gussverfahren benötigt eine anschließende Wärmebehandlung. Des Weiteren muss die Plattenrückseite geschliffen werden, um eine ebene Plattenauflage am Traggerüst zu gewährleisten.Alternatively, therefore, many use manufacturing by a casting process. However, this method requires that a casting model and the appropriate melt be provided for each slot plate. After the casting process, the plate must be cleaned, sprue surfaces removed and inspected for cracks. The casting process also requires a subsequent heat treatment. Furthermore, the back of the plate must be ground to ensure a flat plate support on the support frame.
Auch bei diesen Schlitzplatten muss daher das Originalgefüge des Gussmaterials durch die anschließende Wärmebehandlung für jede Platte eingestellt werden. Der Plattenhersteller kann somit kein gleichbleibendes Gefüge über die komplette Schlitzplattenlieferung garantieren, da es hierbei wiederum zu den oben schon erwähnten Unregelmäßigkeiten kommen kann.Even with these slit plates, therefore, the original structure of the cast material must be adjusted by the subsequent heat treatment for each plate. The plate manufacturer can thus guarantee a consistent structure on the entire slotted plate delivery, since this in turn can lead to the above-mentioned irregularities.
Aus gusstechnischer Sicht ist weiterhin eine Mindestplattenstärke einzuhalten. Entsprechende Einschränkungen ergeben sich auch bei den Abständen zwischen den Schlitzen und der gesamten Schlitzanordnung. Besonders aufwendig ist zudem das Schleifen der Plattenrückseiten, um eine ausreichende Plattenauflage am Traggerüst sicherzustellen. Anderenfalls kann ein Plattenbruch nicht ausgeschlossen werden. Gegenüber den aus Walzstahl hergestellten Schlitzplatten müssen erheblich größere Restwandstärken der Gussplatte eingehalten werden, um Plattenbrüche auszuschließen.From the casting technology point of view, a minimum plate thickness must still be maintained. Corresponding restrictions also arise with the distances between the slots and the entire slot arrangement. Particularly complex is also the grinding of the backs of the plates to ensure a sufficient plate support on the support frame. Otherwise, a plate break can not be ruled out. Compared to slit plates made of rolled steel, considerably greater residual wall thicknesses of the cast plate must be maintained in order to rule out plate fractures.
Aus der
Weiterhin wird in der
Der Erfindung liegt daher die Aufgabe zugrunde, ein neues Verfahren zur Herstellung einer Rohrmühle mit einer aus einer Vielzahl von Schlitzplatten bestehenden Zwischen- oder Austragswand anzugeben, wobei sich die Herstellung der Schlitzplatten durch ein gleichbleibendes Gefüge der gesamten Schlitzplattenlieferung auszeichnet und ein variableres Design ermöglicht.The invention is therefore based on the object of specifying a new method for producing a tube mill with an existing of a plurality of slotted intermediate or discharge wall, with the production of slotted plates is characterized by a consistent structure of the entire slotted plate delivery and allows a variable design.
Erfindungsgemäß wird diese Aufgabe durch die Merkmale des Anspruches 1 gelöst.According to the invention, this object is solved by the features of claim 1.
Beim erfindungsgemäßen Verfahren zur Herstellung einer Rohrmühle mit wenigstens einer aus einer Vielzahl von Schlitzplatten bestehenden Zwischen- oder Austragswand werden die Schlitzplatten gemäß den folgenden Verfahrensschritten hergestellt:
- a. Auswahl eines durchgehärteten Plattenmaterials als Ausgangsmaterial für die Schlitzplatten und
- b. Schneiden der äußeren Kontur der Schlitzplatten und Einbringen von Schlitzen in das Plattenmaterial mittels eines nichtthermischen Schneidverfahrens, insbesondere mittels Wasserstrahlschneiden.
- a. Selection of a hardened plate material as a starting material for the slotted plates and
- b. Cutting the outer contour of the slit plates and introducing slots into the plate material by means of a non-thermal cutting method, in particular by means of water jet cutting.
Durch ein nichtthermisches Schneidverfahren wird das Originalgefüge des Ausgangsmaterials nicht verändert. Insofern ist kein nachträgliches Härten der Schlitzplatten erforderlich. Dadurch kommt es auch nicht zu ungewollten Verzügen der Schlitzplatten, sodass nicht mehr auf eine symmetrische Ausgestaltung der Platten geachtet werden muss. Es ergeben sich dadurch völlig neue Designmöglichkeiten.By a non-thermal cutting process, the original structure of the starting material is not changed. In this respect, no subsequent hardening of the slotted plates is required. This does not lead to unwanted delays the slotted plates, so that no longer has to be paid to a symmetrical design of the plates. This results in completely new design possibilities.
Erfindungsgemäß kann auf Plattenmaterial zurückgegriffen werden, welches direkt im Stahlwerk unter optimalen, immer gleichbleibenden und ständig überwachten Bedingungen einer Produktionsstrasse hergestellt (inkl. Härtung) wird. Dadurch sind für alle Chargen die Werkstoffeigenschaften dokumentiert und nachgewiesen. Unsicherheiten im Bezug auf das Gefüge können somit praktisch ausgeschlossen werden.According to the invention can be made of plate material, which is produced directly in the steelworks under optimal, always consistent and constantly monitored conditions of a production line (including hardening). As a result, the material properties are documented and proven for all batches. Uncertainties regarding the structure can thus be virtually ruled out.
Weitere Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.Further embodiments of the invention are the subject of the dependent claims.
Durch die mögliche Verwendung eines harten, aber dennoch duktilen Werkstoffes für das durchgehärtete Plattenmaterial erlangt man mehr Freiheitsgrade in Bezug auf das Design. Nun können Platten hergestellt werden, die eine zur Verfahrenstechnik der Rohrmühle optimale Schlitzanordnung aufweisen. Diese Anordnung ist völlig unabhängig von der Symmetrie, da kein nachgeschalteter Härteprozess erforderlich ist und keine Rücksichtsnahme auf gusstechnische Beschränkungen erforderlich sind. Daher können insbesondere Schlitze vermieden werden, die aufgrund der Ausbildung des Traggerüstes unnötig sind.The possible use of a hard, yet ductile material for the through-hardened plate material provides more freedom in terms of design. Now plates can be produced which have an optimum tube mill process technology for the slot arrangement. This arrangement is completely independent of the symmetry, since no downstream curing process is required and no consideration for casting restrictions are required. Therefore, in particular slots can be avoided, which are unnecessary due to the formation of the framework.
Gemäß einer bevorzugten Ausgestaltung der Erfindung sind daher zumindest einige der Schlitzplatten mit unsymmetrisch zur Längsmittelachse der Schlitzplatte angeordneten Schlitzen versehen. Des Weiteren können einige der Schlitzplatten mit Schlitzen gefertigt werden, die unterschiedliche Abstände zueinander aufweisen. Auch ist es denkbar, dass mehr Schlitze pro Platte vorgesehen werden können, was die Funktion der Zwischen- oder Austragswand verbessern würde.According to a preferred embodiment of the invention, therefore, at least some of the slit plates are provided with slots arranged asymmetrically to the longitudinal central axis of the slit plate. Furthermore, some of the slit plates can be made with slits having different distances from each other. It is also conceivable that more slots per plate can be provided, which would improve the function of the intermediate or discharge wall.
Nach dem kein zusätzlicher Härtungsschritt erforderlich ist, kann man die gewünschte Härte der Schlitzplatten durch Auswahl eines geeigneten Ausgangsmaterials mit der gewünschten Härte sehr genau festlegen.After no additional curing step is required, the desired hardness of the slotted plates can be set very precisely by selecting a suitable starting material with the desired hardness.
Durch das nichtthermische Verfahren zum Einbringen der Schlitze ist das Verfahren von der Plattenstärke nahezu unabhängig. Theoretisch können nun Platten mit wenigstens 40 mm bis beispielsweise 100 mm realisiert werden. Durch ein stärkeres Plattenmaterial kann die Standzeit der Schlitzplatten entsprechend positiv beeinflusst werden.By the non-thermal method of inserting the slots, the method is nearly independent of plate thickness. Theoretically, plates with at least 40 mm to, for example, 100 mm can now be realized. By a stronger plate material, the service life of the slotted plates can be influenced accordingly positive.
Da das nichtthermische Schneidverfahren keine nachträgliche Härtung erfordert, ist der Werkstoff insbesondere im Bereich der Befestigungsbohrungen unempfindlich gegen Bruch. Dies ermöglicht eine optimierte Ausführung der Plattenbefestigung. So können in die Schlitzplatten mehrere als Durchgangsbohrungen ausgebildete Befestigungsbohrungen gebohrt werden, die mit einer in Durchmesser vergrößerten Sackbohrung versehen werden.Since the non-thermal cutting process requires no subsequent curing, the material is insensitive to breakage, especially in the field of mounting holes. This allows an optimized execution of the plate attachment. Thus, a plurality of mounting holes formed as through holes can be drilled in the slotted plates, which are provided with an enlarged diameter blind bore.
Die Erfindung betrifft weiterhin eine nach dem oben beschriebenen Verfahren hergestellte Schlitzplatte sowie eine Kugelmühle mit einer aus einer Vielzahl von derartigen Schlitzplatten bestehenden Zwischen- oder Austragswand.The invention further relates to a slit plate produced by the method described above, and to a ball mill having an intermediate or discharge wall consisting of a multiplicity of such slotted plates.
Weitere Ausgestaltungen und Vorteile der Erfindung werden im Folgenden anhand der Beschreibung und der Zeichnung näher erläutert.Further embodiments and advantages of the invention are explained in more detail below with reference to the description and the drawing.
In der Zeichnung zeigen
- Fig. 1
- eine schematische Seitenansicht einer Rohrmühle,
- Fig. 2
- eine Ansicht auf die Schlitzplatten eines Segments der Zwischenwand,
- Fig. 3
- eine Ansicht auf ein Segment des Traggerüsts der Zwischenwand und
- Fig. 4
- eine Schnittdarstellung im Bereich einer Befestigungsbohrung längs der Linie A-A der
Fig. 2 .
- Fig. 1
- a schematic side view of a tube mill,
- Fig. 2
- a view of the slotted plates of a segment of the intermediate wall,
- Fig. 3
- a view of a segment of the framework of the partition and
- Fig. 4
- a sectional view in the region of a mounting hole along the line AA of
Fig. 2 ,
Die in
Die Rohrmühle 1 weist eine zylindrische Außenwandung auf und ist in geeigneter Weise in Lagern 9 und 10 um eine Achse 11 drehbar gelagert. Beide Mahlkammern 2, 3 sind mit geeigneten Mahlkugeln beaufschlagt, wobei das über eine Zuführeinrichtung 7 zugeführte Material zunächst in der Grobmahlkammer 2 zerkleinert wird. Das genügend zerkleinerte Material gelangt über die Schlitzplatten 5 in die Feinmahlkammer 3, um dort weiter zerkleinert zu werden. Über die Austragswand 8a und die Austragseinrichtung 8 wird das gemahlene Material abgeführt.The tube mill 1 has a cylindrical outer wall and is suitably rotatably mounted in
Die Zwischenwand 4 und die Austragswand 8a können ähnlich aufgebaut sein, sodass die Ausbildung der Schlitzplatten im Folgenden nur anhand der Zwischenwand 4 näher läutert wird.The
Jede montierte Schlitzplatte wird durch zwei radial ausgerichtete Seitenkanten sowie oberen und unteren, kreisbogenförmigen Begrenzungskanten festgelegt. Die Außenkontur ist bezogen auf eine (radial ausgerichtete) Längsmittelachse 5b symmetrisch ausgebildet. Die Schlitzplatte ist weiterhin mit einer Vielzahl von Schlitzen 5a versehen, die jeweils mit Abstand zu den seitlichen Begrenzungskanten enden und vorzugsweise senkrecht zur Längsmittelachse 5b ausgerichtet sind.Each mounted slotted plate is defined by two radially aligned side edges and upper and lower arcuate boundary edges. The Outer contour is formed symmetrically with respect to a (radially aligned) longitudinal
Ein entsprechendes Segment des Traggerüstes 6 ist aus
Die Schlitzplatten 5 werden üblicherweise am Traggerüst 6 angeschraubt. Hierzu sind die Schlitzplatten 5 mit entsprechenden Durchgangsbohrungen 5c versehen, die gemäß der vergrößerten Schlitzdarstellung gemäß
Bei der Herstellung der Schlitzplatten 5 wird zunächst ein geeignetes, durchgehärtetes Plattenmaterial, als Ausgangsmaterial ausgewählt. Das Ausgangsmaterial wird gleich in der Härte ausgewählt, die für die fertigen Schlitzplatten gewünscht wird. Hierfür kommt beispielsweise Verschleißbleche mit einer Härte von wenigstens 500HV in Betracht.In the manufacture of the slotted
Anschließend werden die äußere Kontur der Schlitzplatten 5 und die Schlitze 5a mittels eines nichtthermischen Schneidverfahrens, insbesondere mittels Wasserstrahl, geschnitten. Durch dieses nichtthermische Schneidverfahren kommt es zu keiner Gefügeveränderung, sodass kein nachträgliches Härten der Schlitzplatten erforderlich ist.Subsequently, the outer contour of the
Bei den bisher bekannten Herstellungsverfahren für die Schlitzplatten war es erforderlich, dass sich die Schlitze symmetrisch zur Längsmittelachse 5b erstreckten, da ansonsten ein zusätzlicher Verzug beim Härten nicht zu vermeiden war. Nachdem mit dem nichtthermischen Schneidverfahren keine zusätzliche Härtung erforderlich ist, können sich die Schlitze auch unsymmetrisch zur Längsmittelachse 5b erstrecken, wie dies aus den meisten der in
Ein weiterer Vorteil des nichtthermischen Schneidverfahrens besteht darin, dass die Schlitze 5a einer Schlitzplatte auch mit unterschiedlichen Abständen zueinander angeordnet werden können und somit verfahrenstechnisch optimiert ausgebildet werden können. Die unterschiedlichen Abstände sind insbesondere bei den radial an der Mitte angeordneten Schlitzplatten ersichtlich.A further advantage of the non-thermal cutting method is that the
Die Plattenstärke der Schlitzplatten hat entscheidenden Einfluss auf die Standzeit der Schlitzplatten. Dickere Platten haben somit eine längere Standzeit bevor sie ausgewechselt werden müssen. Durch den bei den bisherigen Herstellungsverfahren erforderlichen nachträglichen Härtungsvorgang war die Dicke auf etwa 50mm begrenzt. Nun kann auch Plattenmaterial mit Stärken von 40 bis 100mm oder gar mehr verwendet werden.The plate thickness of the slotted plates has a decisive influence on the service life of the slotted plates. Thicker plates thus have a longer life before they have to be replaced. Due to the required in the previous manufacturing process subsequent curing process, the thickness was limited to about 50mm. Now also plate material with thicknesses of 40 to 100mm or even more can be used.
Das neue Herstellungsverfahren zeichnet sich somit auch durch größere Freiheiten in der Anordnung und Ausgestaltung der Schlitze aus.The new manufacturing process is thus characterized by greater freedom in the arrangement and design of the slots.
Claims (9)
- Method for the manufacture of a tube mill (1) having at least one partition or discharge wall (4, 8a) comprising a plurality of slotted plates (5), wherein the slotted plates (5) are manufactured in accordance with the following process steps:a. selecting a fully hardened plate material as the starting material for the slotted plates (5) andb. cutting the outer contour of the slotted plates (5) and introducing slots (5a) into the plate material by means of a non-thermal cutting process.
- Method according to claim 1, characterised in that at least some of the slotted plates (5) are provided with slots (5a) arranged asymmetrically relative to the longitudinal centre axis (5b) of the slotted plate.
- Method according to claim 1, characterised in that at least some of the slotted plates (5) have slots (5a) arranged with different spacings from each other.
- Method according to one or more of the preceding claims, characterised in that the slotted plates (5) are manufactured from the selected plate material without an additional hardening step.
- Method according to one or more of the preceding claims, characterised in that the hardness of the starting material is so selected that it corresponds to the desired hardness of the slotted plates (5) to be manufactured.
- Method according to one or more of the preceding claims, characterised in that a plate material having a plate thickness of at least 40 mm is used.
- Method according to one or more of the preceding claims, characterised in that several drilled fastening holes which are in the form of drilled through-holes (5c) and which are provided with a blind drilled hole (5d) of enlarged diameter are drilled into the slotted plates (5).
- Slotted plate (5), manufactured in accordance with the method according to one or more of the preceding claims.
- Tube mill (1) having at least one partition or discharge wall (4, 8a) comprising a plurality of slotted plates (5), wherein the slotted plates (5) are manufactured in accordance with the method according to one or more of the preceding claims 1 to 7.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102010008808.0A DE102010008808B4 (en) | 2010-02-22 | 2010-02-22 | Method for producing a tube mill |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2361687A1 EP2361687A1 (en) | 2011-08-31 |
EP2361687B1 true EP2361687B1 (en) | 2012-03-28 |
Family
ID=44063534
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP10193498A Not-in-force EP2361687B1 (en) | 2010-02-22 | 2010-12-02 | Method for manufacturing a tube mill |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP2361687B1 (en) |
CN (1) | CN102161012B (en) |
AT (1) | ATE551121T1 (en) |
DE (1) | DE102010008808B4 (en) |
ES (1) | ES2381331T3 (en) |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19638698A1 (en) * | 1996-09-20 | 1998-03-26 | Pfeiffer Christian Maschf | Mill partition |
DE102007046193A1 (en) * | 2007-09-26 | 2009-04-02 | Schrage, Otto, Dipl.-Ing. | Tile for use as e.g. plate, for spiral screw of decanting centrifuge, has carrier with hard coating formed as wear layer and made of material e.g. chromium oxide, aluminum oxide, titanium oxide, chromium carbide or tungsten carbide |
CN201346483Y (en) * | 2009-01-08 | 2009-11-18 | 范荣明 | Partition plate and discharge screen of ball mill |
-
2010
- 2010-02-22 DE DE102010008808.0A patent/DE102010008808B4/en not_active Expired - Fee Related
- 2010-12-02 EP EP10193498A patent/EP2361687B1/en not_active Not-in-force
- 2010-12-02 AT AT10193498T patent/ATE551121T1/en active
- 2010-12-02 ES ES10193498T patent/ES2381331T3/en active Active
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2011
- 2011-02-22 CN CN201110051768.8A patent/CN102161012B/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE102010008808B4 (en) | 2014-08-14 |
EP2361687A1 (en) | 2011-08-31 |
CN102161012A (en) | 2011-08-24 |
ATE551121T1 (en) | 2012-04-15 |
DE102010008808A1 (en) | 2011-08-25 |
CN102161012B (en) | 2015-07-22 |
ES2381331T3 (en) | 2012-05-25 |
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