EP0591649B1 - Edge mill - Google Patents

Edge mill Download PDF

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Publication number
EP0591649B1
EP0591649B1 EP93112896A EP93112896A EP0591649B1 EP 0591649 B1 EP0591649 B1 EP 0591649B1 EP 93112896 A EP93112896 A EP 93112896A EP 93112896 A EP93112896 A EP 93112896A EP 0591649 B1 EP0591649 B1 EP 0591649B1
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EP
European Patent Office
Prior art keywords
grinding track
rotor
grinding
edge mill
outer rotor
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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.)
Expired - Lifetime
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EP93112896A
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German (de)
French (fr)
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EP0591649A1 (en
Inventor
Franz Vogel
Hartwig Müller
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Ingenieurbuero Franz Vogel GmbH
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Ingenieurbuero Franz Vogel GmbH
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Publication of EP0591649A1 publication Critical patent/EP0591649A1/en
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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
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/14—Edge runners, e.g. Chile mills

Definitions

  • the invention relates to a pan mill for the preparation of moist ceramic masses, in particular brick clay, according to the preamble of claim 1.
  • a pan mill for the preparation of moist ceramic masses, in particular brick clay, according to the preamble of claim 1.
  • Such a pan mill is known from DE 36 40 081 A1.
  • the regrind is subjected to a positive guidance in such a way that it has to pass through a spiral path on the grinding track surface from the inside to the outside and is thereby subjected to several rollover processes.
  • This ensures a comparatively long residence time of the regrind with several roll-over processes by the inner and outer rotor, even with large throughput quantities per unit of time.
  • the degree of comminution of the ground material is largely determined by the passage openings provided in the outer area of the grinding track surface.
  • the degree of comminution determined by the passage openings can be changed only with great effort, namely generally only by exchanging the grinding track surface. Further is the wear of the grinding track in the area of the passage openings is greater than in its remaining area, which results in uneven wear of the grinding track area.
  • An uneven grinding track surface not only leads to an uneven grinding process, but also brings about the risk of damage to the rotor surfaces, their suspension and if the runners roll directly on the grinding track surface, which can happen before or after or when the material feed is interrupted / or their drive with them.
  • the object of the present invention is therefore to improve the known pan mill so that a high degree of comminution of the ground material is achieved, which is variable and easily adjustable. Furthermore, the wear of the grinding track surface should be kept as small as possible and, above all, as uniform as possible. This object is achieved by the features of claim 1.
  • the invention In contrast to the known pan millers, in which the grinding track surface is provided with through openings in its outer area, the invention therefore provides an unperforated, continuous ring plate as the grinding track. Due to the complete absence of the grinding path perforation, an extension of the rollover or squeezing path and thus a higher degree of comminution of the material to be ground is achieved in a simple manner. Since the two runners are mounted so that they can be adjusted vertically, the distance between the runners, in particular the outer rotor and the grinding track surface, can be measured. The degree of comminution of the ground material can be determined by this distance.
  • the material to be ground is automatically guided back inwards in the direction of rotation in front of the inner or outer rotor by the automatic change in the position of the outer steering surface during operation and rolled over until the desired degree of comminution is reached is. Only then is the position of the outer steering surface changed again so that the ground material can fall over the outer edge of the grinding path onto the collecting plate.
  • the grinding tracks of the inner and outer rotor do not either completely overlap or at least partially overlap, as in the known pan mill, but are completely separated from one another, that is to say they connect to one another, or even a small one There is an annular gap between the two.
  • the grinding track surface has no through openings, but is formed by a uniform, continuous ring plate, and that the two grinding tracks of the runners are separated from one another does not result in the known uneven wear of the grinding track surface and rotor surfaces the increased wear of the perforated grinding track area and furrow-like wear phenomena of the overlap area and that the service life of the grinding track surface and the rotor surfaces is increased considerably as a result.
  • the diameter of the center column carrying the grinding track is chosen so large that it essentially covers the entire grinding track area supported.
  • the pan mill shown in FIG. 1 rests on a central column 10 and an overlying support base 12 on which an annular continuous plate 14 rests, which is supported essentially over its entire surface by the support base 12 or the central column 10.
  • Center column 10 and support base 12 are penetrated by a vertical vertical shaft 15, which is driven at its lower end by a gear 16 by a motor 16 and whose upper end is located above plate 14.
  • the ring plate 14 is surrounded at a distance by a radially displaceable, vertically upwardly projecting side wall 17 which is supported by a column 11.
  • transverse webs a console or the like can also be provided.
  • a channel-shaped material feed 23 sits on the free upper end of the vertical shaft 15 Upper end via a conveyor, not shown, such as a belt conveyor, is fed with the material to be shredded, while the lower end 23a is arranged above the material web surface in such a way that the material is only directly in the direction of rotation of the rotor (arrow direction A in FIG. 2) the inner rotor 18 is delivered to the grinding track surface.
  • the material feed 23 is rigidly connected to the vertical shaft 15 so that it rotates with it.
  • the grinding track plate 14 is divided into an inner grinding track surface 14a and an outer grinding track surface 14b, the inner grinding track surface 14a being overrun by the inner runner 18 and the outer grinding track surface 14b by the outer runner 19.
  • the steering surfaces 24 and 25 are designed as wipers or drivers and to the direction of movement of the runners 18, 19 inclined.
  • two vertically adjustable material guide elements 26 and 27, which also rotate with the vertical shaft 15, are attached to the vertical shaft 15, which lead the inner rotor 18 and the outer rotor 19 in the direction of rotation thereof.
  • the inner material guide element 26 is essentially arranged opposite the discharge opening 23a of the material feed 23 with the latter on a radial line in order to prevent the material fed onto the grinding track 14 from directly reaching the outer grinding track surface section 14b.
  • the outer material guide element 27 lies in the region of the outer circumference of the outer grinding track section 14b essentially on the radial line of the outer end of the inner steering surface 24.
  • the two runners 18, 19 are arranged diagonally to one another; the representation of Fig. 1 with both Runners on the same radius do not correspond to the actual execution and have only been chosen for better understanding.
  • the regrind for example moist brick clay
  • the material is rolled over and crushed several times by the two runners 18, 19, the two steering surfaces 24, 25 being set up in such a way that the rolled material is moved spirally from the inside to the outside to the discharge area 21.
  • the two runners 18, 19 are mounted so as to be vertically displaceable, and the distance between the runners 18, 19 and the grinding track surface 14 is dependent on the degree of comminution of the material to be ground. This distance is determined at intervals or continuously during operation of the pan mill and is used as a control variable for the position of the adjustable outer steering surface 25.
  • the outer steering surface 25 assumes the position shown in solid lines in FIG. 2 and guides the material spirally outward via the grinding track surface 14 to the discharge area 21. From there, the ground material falls onto the one arranged under the discharge region 21, in the opposite direction to the direction of movement of the runners 18, 19 rotating collecting plate 22 and is removed from there.
  • the direction of rotation of the collecting plate 22 opposite to the direction of movement of the runners serves in particular for the particularly uniform discharge of the ground material.
  • a rotor-grinding path distance is determined which is above a predetermined target value, ie if the desired degree of comminution has not yet been reached, the position of the outer steering surface 25 is automatically changed so that this Fig. 2 assumed position shown in dashed lines, and the regrind is returned on the grinding track 14 from the outside to the inside. In any case, the regrind is rolled over until the desired degree of comminution is reached.
  • not only the outer steering surface 25, but also the inner steering surface 24 is adjustable, so that the degree of pre-comminution can already be controlled by optionally returning the ground material to the inner grinding path section 14a.
  • a filter screen (not shown) can be provided in the discharge area 21, which prevents pieces of regrind that are still too large from falling onto the collecting plate 22 and being conveyed away.
  • the co-rotating inner material guiding element 26 for the inner rotor 18 and the co-rotating outer material guiding element 27 for the outer rotor 19 are provided.
  • the distance between the lower edge of each material guide element 26, 27 and the grinding track surface can be adapted to the desired degree of comminution, so that if the material is still coarsely ground, some of the material to be ground is retained on the grinding track 14 by the material guide elements.
  • the outer material guide element 27 also prevents the material which has been comminuted on the inner grinding track surface 14a and passed through the rotating steering surface 24 onto the outer grinding track surface 14b from reaching the discharge area 21 directly.
  • the arrangement according to the invention ensures that the ground material is rolled over on the unperforated grinding track 14 until the desired degree of comminution is reached.
  • the degree of comminution can be easily and precisely adjusted by specifying the desired distance from the rotor to the grinding track surface changeable. Furthermore, a very high degree of comminution can be achieved with the device according to the invention.
  • the two grinding tracks of the rotors 18 and 19 do not overlap, but rather connect with one another with no or with a minimal gap.
  • the distance a of the vertical outer surface of the inner runner 18 from the central runner axis is equal to or slightly less than the distance b of the inner vertical surface of the outer runner 19 from the central runner axis.
  • a ⁇ b holds.
  • the inner grinding track surface 14a is therefore only rolled over by the inner rotor 18, the outer grinding track surface 14b exclusively by the outer rotor 19.
  • the wear of the inner grinding surface 14a and that of the outer grinding surface 14b and the rotor surfaces 18 and 19 is therefore extremely uniform.
  • the wear of the two grinding track surfaces 14a, 14b above the rotor surfaces 18, 19 also differs only slightly from one another, because according to the invention both grinding track sections 14a, 14b are formed by unperforated, continuous ring plates, the total load of which is essentially the same.
  • a slightly uneven loading of the grinding track surface 14 results only from the fact that the dwell times of the ground material in the respective sections 14a and 14b and the mean orbit lengths for the two runners 18 and 19 differ slightly from one another.
  • the rotor surfaces 18 and 19 also wear differently because they have different rolling areas and different rolling behavior.
  • the fact that the two grinding track surfaces 14a, 14b and rotor surfaces 18 and 19 are separate components results in no difficulties from the uneven wear; each grinding track surface is replaced independently of the other as required.
  • the center column 10 has a considerable diameter, such that it the grinding track plate 14 or the support base 12 approximately in the center of the outer runner 19 supported.
  • the radius of the center column 10 is equal to or greater than the radius of the center point of the outer rotor 18, in each case with respect to the center axis of the pan mill.
  • the support base 12 is dimensioned such that inner and outer grinding track surfaces 14a, 14b are completely supported by the support base 12; this ensures that the grinding track plate 14 manages with a comparatively simple and easy support.
  • the central column was comparatively slim and complex and heavy support structures were required to support the grinding track, namely support structures with a weight of several tons.
  • the construction according to the invention results in considerable weight and cost savings.
  • the side wall 17 surrounding the grinding track surface 14 at a distance prevents material from escaping laterally over the edge of the pan pass, and moreover serves as protection against the rotating runners 18, 19 of the dropping area 21 may be provided.
  • the side wall 17 can also be mounted in a radially displaceable manner in order to enlarge or reduce the discharge area as required.

Abstract

An edge mill for processing ceramic masses, in particular brick clay, which has a horizontal, circular-disc-shaped grinding track surface (14), an inner and an outer edge runner (18, 19), which circulate on the grinding track surface (14) in the circumferential direction of the latter, and a central material feed (23), is improved. The improvement consists in that the grinding track (14) is formed by an unperforated ring plate and in that an outer guide surface (25), which follows the outer edge runner (19) in the direction of motion of the latter, can be adjusted in such a manner that the ground material which has been rolled over by the outer edge runner (19) either moves from the inside to the outside and over the outer edge of the grinding track (14) into a discharge region (21) or moves from the outside to the inside in the circulation direction in front of the inner edge runner (18). <IMAGE>

Description

Die Erfindung betrifft einen Kollergang für die Aufbereitung feuchter keramischer Massen, insbesondere Ziegelton, gemäß dem Oberbegriff des Patentanspruchs 1. Ein derartiger Kollergang ist aus der DE 36 40 081 A1 bekannt.The invention relates to a pan mill for the preparation of moist ceramic masses, in particular brick clay, according to the preamble of claim 1. Such a pan mill is known from DE 36 40 081 A1.

Bei diesem bekannten Kollergang wird das Mahlgut einer Zwangsführung unterworfen, derart, daß es einen spiralförmigen Weg auf der Mahlbahnfläche von innen nach außen durchlaufen muß und dabei mehreren Überroll-Vorgängen unterworfen ist. Damit ist auch bei großen Durchsatzmengen pro Zeiteinheit eine vergleichsweise lange Verweilzeit des Mahlgutes mit mehreren Überroll-Vorgängen durch den inneren und den äußeren Läufer gewährleistet. Der Zerkleinerungsgrad des Mahlgutes wird maßgeblich durch die im äußeren Bereich der Mahlbahnfläche vorgesehenen Durchtrittsöffnungen bestimmt.In this known pan mill, the regrind is subjected to a positive guidance in such a way that it has to pass through a spiral path on the grinding track surface from the inside to the outside and is thereby subjected to several rollover processes. This ensures a comparatively long residence time of the regrind with several roll-over processes by the inner and outer rotor, even with large throughput quantities per unit of time. The degree of comminution of the ground material is largely determined by the passage openings provided in the outer area of the grinding track surface.

Der durch die Durchtrittsöffnungen bestimmte Zerkleinerungsgrad ist dabei nur mit großem Aufwand veränderbar, nämlich im allgemeinen nur durch den Austausch der Mahlbahnfläche. Ferner ist die Abnutzung der Mahlbahn im Bereich der Durchtrittsöffnungen größer als in ihrem übrigen Bereich, wodurch sich eine ungleichmäßige Abnutzung der Mahlbahnfläche ergibt. Eine unebene Mahlbahnfläche führt aber nicht nur zu einem ungleichmäßigen Mahlvorgang, sondern bringt darüberhinaus dann, wenn die Läufer unmittelbar auf der Mahlbahnfläche abrollen, was vor oder nach bzw. bei einer Unterbrechung der Mahlgutzuführung geschehen kann, die Gefahr von Beschädigungen der Läuferflächen, ihrer Aufhängung und/oder ihres Antriebs mit sich.The degree of comminution determined by the passage openings can be changed only with great effort, namely generally only by exchanging the grinding track surface. Further is the wear of the grinding track in the area of the passage openings is greater than in its remaining area, which results in uneven wear of the grinding track area. An uneven grinding track surface not only leads to an uneven grinding process, but also brings about the risk of damage to the rotor surfaces, their suspension and if the runners roll directly on the grinding track surface, which can happen before or after or when the material feed is interrupted / or their drive with them.

Aufgabe der vorliegenden Erfindung ist es deshalb, den bekannten Kollergang so zu verbessern, daß ein hoher Zerkleinerungsgrad des Mahlgutes erzielt wird, der variabel und leicht einstellbar ist. Ferner soll die Abnutzung der Mahlbahnfläche möglichst gering und vor allem möglichst gleichmäßig gehalten werden. Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Patentanspruchs 1 gelöst.The object of the present invention is therefore to improve the known pan mill so that a high degree of comminution of the ground material is achieved, which is variable and easily adjustable. Furthermore, the wear of the grinding track surface should be kept as small as possible and, above all, as uniform as possible. This object is achieved by the features of claim 1.

Im Gegensatz zu den bekannten Kollergängen, bei denen die Mahlbahnfläche in ihrem äußeren Bereich mit Durchtrittsöffnungen versehen ist, sieht die Erfindung also eine ungelochte, durchgehende Ringplatte als Mahlbahn vor. Durch das vollständige Fehlen der Mahlbahnlochung wird auf einfache Weise eine Verlängerung des Überroll- oder Quetschweges und dadurch ein höherer Zerkleinerungsgrad des Mahlgutes erzielt. Da die beiden Läufer vertikal nachführbar gelagert sind, ist der Abstand zwischen den Läufern, insbesondere des äußeren Läufers und der Mahlbahnfläche meßbar. Durch diesen Abstand kann der Zerkleinerunsgrad des Mahlgutes bestimmt werden. Ist der Abstand beispielsweise zu groß, so wird das Mahlgut durch eine automatische Veränderung der Stellung der äußeren Lenkfläche während des Betriebs über die Mahlbahnfläche nach innen, in Umlaufrichtung vor den inneren oder den äußeren Läufer zurück geführt und so lange überrollt, bis der gewünschte Zerkleinerungsgrad erreicht ist. Erst dann wird die Stellung der äußeren Lenkfläche wieder so verändert, daß das Mahlgut über den äußeren Rand der Mahlbahn auf den Sammelteller abfallen kann.In contrast to the known pan millers, in which the grinding track surface is provided with through openings in its outer area, the invention therefore provides an unperforated, continuous ring plate as the grinding track. Due to the complete absence of the grinding path perforation, an extension of the rollover or squeezing path and thus a higher degree of comminution of the material to be ground is achieved in a simple manner. Since the two runners are mounted so that they can be adjusted vertically, the distance between the runners, in particular the outer rotor and the grinding track surface, can be measured. The degree of comminution of the ground material can be determined by this distance. If, for example, the distance is too large, the material to be ground is automatically guided back inwards in the direction of rotation in front of the inner or outer rotor by the automatic change in the position of the outer steering surface during operation and rolled over until the desired degree of comminution is reached is. Only then is the position of the outer steering surface changed again so that the ground material can fall over the outer edge of the grinding path onto the collecting plate.

Dabei war man bisher der Auffassung, daß eine ungelochte Mahlbahn nur in Verbindung mit trockenem Mahlgut, wie Sand oder Sandgemischen, wirksam eingesetzt werden kann. Derartige Kollergänge für trockenes Mahlgut wurden in der Regel diskontinuierlich betrieben, indem das Mahlgut zugegeben und solang überrollt wurde, bis der gewünschte Zerkleinerungsgrad erreicht war, und indem dann eine Auslaßöffnung in der Mahlbahn geöffnet wurde, um das zerkleinerte Gut nach unten abzugeben. Dagegen wurde es bei feuchtem Mahlgut bisher als notwendig angesehen, dieses für eine angemessene Zerkleinerung durch entsprechende Durchtrittsöffnungen in der Mahlbahnfläche hindurchzupressen.It was previously thought that an unperforated grinding track could only be used effectively in conjunction with dry regrind, such as sand or sand mixtures. Such pan millers for dry regrind were generally operated batchwise by adding the regrind and rolling over until the desired degree of comminution was reached, and then by opening an outlet opening in the grinding track in order to discharge the comminuted material downwards. In contrast, in the case of moist regrind, it was previously considered necessary to press it through appropriate through openings in the grinding track surface for appropriate comminution.

Gemäß einer bevorzugten Ausgestaltung der Erfindung ist vorgesehen, daß die Mahlbahnen des inneren und des äußeren Läufers sich nicht, wie bei den bekannten Kollergängen, entweder vollständig überdecken oder zumindest teilweise überlappen, sondern vollständig voneinander getrennt sind, also aneinander anschließen, oder daß sogar ein geringer Ringspalt zwischen beiden besteht. Dabei haben Versuche ergeben, daß aufgrund der dem Mahlgut aufgezwungenen spiralförmigen Bewegung von innen nach außen trotzdem das Mahlgut einwandfrei vom inneren und vom äußeren Läufer überrollt wird und es zu keiner Störung der spiralförmigen Materialgutbewegung kommt.According to a preferred embodiment of the invention, it is provided that the grinding tracks of the inner and outer rotor do not either completely overlap or at least partially overlap, as in the known pan mill, but are completely separated from one another, that is to say they connect to one another, or even a small one There is an annular gap between the two. Experiments have shown that due to the spiral movement imposed on the material to be ground from the inside out, the material to be ground is still rolled over smoothly by the inner and outer rotor and there is no disturbance of the spiral material movement.

Es hat sich gezeigt, daß dadurch, daß die Mahlbahnfläche keine Durchtrittsöffnungen aufweist, sondern von einer gleichmäßigen, durchgehenden Ringplatte gebildet ist, und dadurch, daß die beiden Mahlbahnen der Läufer voneinander getrennt sind, es nicht zu der bekannten ungleichmäßigen Abnutzung der Mahlbahnfläche und Läuferflächen infolge der stärkeren Abnutzung des gelochten Mahlbahnbereiches und von furchenartigen Abnutzungserscheinungen des Überlappungsbereichs kommt und daß sich die Standzeit der Mahlbahnfläche und der Läuferflächen dadurch beträchtlich erhöht.It has been shown that the fact that the grinding track surface has no through openings, but is formed by a uniform, continuous ring plate, and that the two grinding tracks of the runners are separated from one another does not result in the known uneven wear of the grinding track surface and rotor surfaces the increased wear of the perforated grinding track area and furrow-like wear phenomena of the overlap area and that the service life of the grinding track surface and the rotor surfaces is increased considerably as a result.

Gemäß einer weiteren Ausgestaltung der Erfindung ist der Durchmesser der die Mahlbahn tragenden Mittelsäule so groß gewählt, daß sie im wesentlichen die gesamte Mahlbahnfläche unterstützt.According to a further embodiment of the invention, the diameter of the center column carrying the grinding track is chosen so large that it essentially covers the entire grinding track area supported.

Die Erfindung ist im folgenden anhand einer bevorzugten Ausführungsform mit Bezug auf die Zeichnung näher erläutert. Es zeigen:

Fig. 1
den erfindungsgemäßen Kollergang in Seitenansicht, wobei zur Verdeutlichung Gehäuseteile weggebrochen sind und die eine - rechte - Kollergangsseite weggelassen ist und
Fig. 2
eine Draufsicht auf den Kollergang von Fig. 1.
The invention is explained below with reference to a preferred embodiment with reference to the drawing. Show it:
Fig. 1
the pan mill according to the invention in side view, housing parts broken away for clarification and the one - right - pan mill side omitted and
Fig. 2
a plan view of the pan mill of Fig. 1st

Der in Fig. 1 gezeigte Kollergang ruht auf einer Mittelsäule 10 und einem darüber liegenden Tragboden 12, auf dem eine kreisringförmige durchgehende Platte 14 aufliegt, die im wesentlichen über ihre gesamte Fläche durch den Tragboden 12 bzw. die Mittelsäule 10 abgestützt ist. Mittelsäule 10 und Tragboden 12 werden von einer vertikalen Königswelle 15 durchsetzt, die an ihrem unteren Ende über ein Getriebe von einem Motor 16 angetrieben ist und deren oberes Ende sich über der Platte 14 befindet. Die Ringplatte 14 ist mit Abstand von einer radial verschiebbaren, senkrecht nach oben abstehenden Seitenwand 17 umgeben, welche von einer Säule 11 getragen ist. Anstelle der Säule 11 können auch Querstege, eine Konsole oder ähnliches vorgesehen sein. Auf der Oberfläche der Platte 14, welche die Mahlbahnfläche darstellt, laufen zwei Läufer um, nämlich ein innerer Läufer 18 und ein äußerer Läufer 19, die in üblicher Weise über Querarme 20 an der Königswelle 15 vertikal verschiebbar gelagert sind und von dieser angetrieben werden. Zwischen dem äußeren Rand der Mahlbahn-Platte 14 und der Seitenwand 17 befindet sich ein Abwurfbereich 21 für zerkleinertes Mahlgut. Unterhalb dieses Abwurfbereiches 21 ist ein kreisringförmiger, drehbarer Sammelteller 22 mit einem Antrieb 28 angeordnet.The pan mill shown in FIG. 1 rests on a central column 10 and an overlying support base 12 on which an annular continuous plate 14 rests, which is supported essentially over its entire surface by the support base 12 or the central column 10. Center column 10 and support base 12 are penetrated by a vertical vertical shaft 15, which is driven at its lower end by a gear 16 by a motor 16 and whose upper end is located above plate 14. The ring plate 14 is surrounded at a distance by a radially displaceable, vertically upwardly projecting side wall 17 which is supported by a column 11. Instead of the column 11, transverse webs, a console or the like can also be provided. On the surface of the plate 14, which represents the grinding track surface, two runners run around, namely an inner runner 18 and an outer runner 19, which are mounted vertically displaceably via transverse arms 20 on the vertical shaft 15 and are driven by the latter. Between the outer edge of the grinding track plate 14 and the side wall 17 there is a discharge area 21 for ground material. An annular, rotatable collecting plate 22 with a drive 28 is arranged below this discharge area 21.

Wie aus Fig. 2 ersichtlich, sitzt auf dem freien oberen Ende der Königswelle 15 eine rinnenförmige Materialzuführung 23, deren oberes Ende über einen nicht dargestellten Förderer, etwa einen Bandförderer, mit dem zu zerkleinernden Material beschickt wird, während das untere Ende 23a so über der Materialbahnfläche angeordnet ist, daß das Material ausschließlich unmittelbar - in Läuferdrehrichtung (Pfeirichtung A in Fig. 2) - vor dem inneren Läufer 18 auf die Mahlbahnfläche abgegeben wird. Dabei ist die Materialzuführung 23 starr mit der Königswelle 15 verbunden, so daß sie sich mit dieser mitdreht.As can be seen from FIG. 2, a channel-shaped material feed 23 sits on the free upper end of the vertical shaft 15 Upper end via a conveyor, not shown, such as a belt conveyor, is fed with the material to be shredded, while the lower end 23a is arranged above the material web surface in such a way that the material is only directly in the direction of rotation of the rotor (arrow direction A in FIG. 2) the inner rotor 18 is delivered to the grinding track surface. The material feed 23 is rigidly connected to the vertical shaft 15 so that it rotates with it.

Die Mahlbahn-Platte 14 ist in eine innere Mahlbahnfläche 14a und in eine äußere Mahlbahnfläche 14b unterteilt, wobei die innere Mahlbahnfläche 14a vom inneren Läufer 18, die äußere Mahlbahnfläche 14b vom äußeren Läufer 19 überrollt wird.The grinding track plate 14 is divided into an inner grinding track surface 14a and an outer grinding track surface 14b, the inner grinding track surface 14a being overrun by the inner runner 18 and the outer grinding track surface 14b by the outer runner 19.

An der Königswelle 15 sind zwei durch diese angetriebene Lenkflächen-Anordnungen befestigt, nämlich eine dem inneren Läufer 18 in dessen Umlaufrichtung nachlaufende Lenkfläche 24 und eine verstellbare, dem äußeren Läufer 19 nachlaufende Lenkfläche 25. Die Lenkflächen 24 und 25 sind als Abstreifer oder Mitnehmer ausgebildet und zur Bewegungsrichtung der Läufer 18, 19 schräg angestellt.On the vertical shaft 15, two steering surface arrangements driven by this are fastened, namely a steering surface 24 trailing the inner rotor 18 in its direction of rotation and an adjustable steering surface 25 trailing the outer rotor 19. The steering surfaces 24 and 25 are designed as wipers or drivers and to the direction of movement of the runners 18, 19 inclined.

Weiterhin sind zwei mit der Königswelle 15 mitrotierende, vertikal verstellbare Materialleitelemente 26 und 27 an der Königswelle 15 angebracht, die dem inneren Läufer 18 bzw. dem äußeren Läufer 19 in deren Umlaufrichtung vorlaufen. Das innere Materialleitelement 26 ist im wesentlichen der Abgabeöffnung 23a der Materialzuführung 23 gegenüber mit dieser auf einer Radiallinie angeordnet, um zu verhindern, daß das auf die Mahlbahn 14 aufgegebene Material direkt auf den äußeren Mahlbahnflächenabschnitt 14b gelangt. Das äußere Materialleitelement 27 liegt im Bereich des Außenumfangs des äußeren Mahlbahnabschnittes 14b im wesentlichen auf der Radiallinie des äußeren Endes der inneren Lenkfläche 24.Furthermore, two vertically adjustable material guide elements 26 and 27, which also rotate with the vertical shaft 15, are attached to the vertical shaft 15, which lead the inner rotor 18 and the outer rotor 19 in the direction of rotation thereof. The inner material guide element 26 is essentially arranged opposite the discharge opening 23a of the material feed 23 with the latter on a radial line in order to prevent the material fed onto the grinding track 14 from directly reaching the outer grinding track surface section 14b. The outer material guide element 27 lies in the region of the outer circumference of the outer grinding track section 14b essentially on the radial line of the outer end of the inner steering surface 24.

Die beiden Läufer 18, 19 sind, wie aus Fig. 2 ersichtlich, zueinander diagonal angeordnet; die Darstellung von Fig. 1 mit beiden Läufern auf dem gleichen Radius entspricht nicht der tatsächlichen Ausführung und ist lediglich zum besseren Verständnis gewählt worden.As can be seen from FIG. 2, the two runners 18, 19 are arranged diagonally to one another; the representation of Fig. 1 with both Runners on the same radius do not correspond to the actual execution and have only been chosen for better understanding.

Im folgenden ist der Betrieb des erfindungsgemäßen Kollergangs beschrieben.The operation of the pan mill according to the invention is described below.

Das Mahlgut, beispielsweise feuchter Ziegelton, wird im Zentrum des Kollergangs über die mitrotierende, rinnenförmige Materialzuführung 23 aufgegeben. Das Material wird von den beiden Läufern 18, 19 mehrmals überrollt und dabei zerkleinert, wobei die beiden Lenkflächen 24, 25 so angestellt sind, daß das überrollte Material spiralförmig von innen nach außen zum Abwurfbereich 21 bewegt wird. Die beiden Läufer 18, 19 sind vertikal verschiebbar gelagert, und der Abstand der Läufer 18, 19 zur Mahlbahnfläche 14 ist abhängig vom erreichten Zerkleinerungsgrad des Mahlgutes. Dieser Abstand wird während des Betriebs des Kollergangs in Intervallen oder kontinuierlich ermittelt und als Steuergröße für die Stellung der verstellbaren äußeren Lenkfläche 25 eingesetzt.The regrind, for example moist brick clay, is fed in at the center of the pan mill via the co-rotating, trough-shaped material feed 23. The material is rolled over and crushed several times by the two runners 18, 19, the two steering surfaces 24, 25 being set up in such a way that the rolled material is moved spirally from the inside to the outside to the discharge area 21. The two runners 18, 19 are mounted so as to be vertically displaceable, and the distance between the runners 18, 19 and the grinding track surface 14 is dependent on the degree of comminution of the material to be ground. This distance is determined at intervals or continuously during operation of the pan mill and is used as a control variable for the position of the adjustable outer steering surface 25.

Wenn der Abstand des äußeren Läufers 19 zur Mahlbahnfläche unter einem Sollwert liegt, d.h. wenn ein gewünschter Zerkleinerungsgrad erreicht ist, nimmt die äußere Lenkfläche 25 die in Fig. 2 durchgezogen gezeichnete Stellung ein und leitet das Material über die Mahlbahnfläche 14 spiralförmig nach außen zum Abwurfbereich 21. von dort fällt das zerkleinerte Mahlgut auf den unter dem Abwurfbereich 21 angeordneten, in zur Bewegungsrichtung der Läufer 18, 19 entgegengesetzter Richtung rotierenden Sammelteller 22 und wird von dort abgefördert. Die zur Bewegungsrichtung der Läufer entgegengesetzte Drehrichtung des Sammeltellers 22 dient insbesondere dem besonders gleichmäßigen Austrag des Mahlgutes.If the distance of the outer rotor 19 to the grinding track surface is below a setpoint, i.e. when a desired degree of comminution has been reached, the outer steering surface 25 assumes the position shown in solid lines in FIG. 2 and guides the material spirally outward via the grinding track surface 14 to the discharge area 21. From there, the ground material falls onto the one arranged under the discharge region 21, in the opposite direction to the direction of movement of the runners 18, 19 rotating collecting plate 22 and is removed from there. The direction of rotation of the collecting plate 22 opposite to the direction of movement of the runners serves in particular for the particularly uniform discharge of the ground material.

Wenn dagegen ein Läufer-Mahlbahn-Abstand ermittelt wird, der über einem vorgegebenen Sollwert liegt, d.h. wenn der gewünschte Zerkleinerungsgrad noch nicht erreicht ist, wird die Stellung der äußeren Lenkfläche 25 automatisch so verändert, daß diese die in Fig. 2 gestrichelt gezeichnete Lage annimmmt, und das Mahlgut wird auf der Mahlbahn 14 von außen nach innen zurückgeführt. Das Mahlgut wird also in jedem Fall solange überrollt, bis der gewünschte Zerkleinerungsgrad erreicht ist.If, on the other hand, a rotor-grinding path distance is determined which is above a predetermined target value, ie if the desired degree of comminution has not yet been reached, the position of the outer steering surface 25 is automatically changed so that this Fig. 2 assumed position shown in dashed lines, and the regrind is returned on the grinding track 14 from the outside to the inside. In any case, the regrind is rolled over until the desired degree of comminution is reached.

Alterativ kann auch vorgesehen sein, daß nicht nur die äußere Lenkfläche 25, sondern auch die innere Lenkfläche 24 verstellbar ist, so daß durch optionales Rückführen des Mahlgutes auf den inneren Mahlbahnabschnitt 14a bereits der Grad der Vorzerkleinerung steuerbar ist.Alternatively, it can also be provided that not only the outer steering surface 25, but also the inner steering surface 24 is adjustable, so that the degree of pre-comminution can already be controlled by optionally returning the ground material to the inner grinding path section 14a.

Vorsorglich kann im Abwurfbereich 21 ein (nicht gezeigtes) Filtersieb vorgesehen sein, das verhindert, daß dennoch verbleibende zu große Mahlgutstücke auf den Sammelteller 22 fallen und abgefördert werden.As a precaution, a filter screen (not shown) can be provided in the discharge area 21, which prevents pieces of regrind that are still too large from falling onto the collecting plate 22 and being conveyed away.

Um sicherzustellen, daß das zugeführte Material gezielt auf die Mahlbahnfläche 14 geleitet und dann ordnungsgemäß zerkleinert wird, sind das mitrotierende innere Materialleitelement 26 für den inneren Läufer 18 und das mitrotierende äußere Materialleitelement 27 für den äußeren Läufer 19 vorgesehen. Der Abstand zwischen der Unterkante jedes Materialleitelementes 26, 27 und der Mahlbahnoberfläche ist dem gewünschten Zerkleinerungsgrad anpaßbar, so daß bei noch zu grob gemahlenem Material ein Teil des Mahlgutes durch die Materialleitelemente auf der Mahlbahn 14 zurückgehalten wird. Das äußere Materialleitelement 27 verhindert außerdem, daß das auf der inneren Mahlbahnfläche 14a vorzerkleinerte und durch die mitdrehende Lenkfläche 24 auf die äußere Mahlbahnfläche 14b geleitete Material direkt in den Abwurfbereich 21 gelangt.In order to ensure that the supplied material is directed onto the grinding track surface 14 and is then properly comminuted, the co-rotating inner material guiding element 26 for the inner rotor 18 and the co-rotating outer material guiding element 27 for the outer rotor 19 are provided. The distance between the lower edge of each material guide element 26, 27 and the grinding track surface can be adapted to the desired degree of comminution, so that if the material is still coarsely ground, some of the material to be ground is retained on the grinding track 14 by the material guide elements. The outer material guide element 27 also prevents the material which has been comminuted on the inner grinding track surface 14a and passed through the rotating steering surface 24 onto the outer grinding track surface 14b from reaching the discharge area 21 directly.

Durch die erfindungsgemäße Anordnung ist sichergestellt, daß das Mahlgut auf der ungelochten Mahlbahn 14 so oft überrollt wird, bis der gewünschte Zerkleinerungsgrad erreicht ist. Der Zerkleinerungsgrad ist durch die Vorgabe des Sollabstandes von Läufer zu Mahlbahnfläche auf einfache Weise genau einstellbar und veränderbar. Ferner kann mit der erfindungsgemäßen Vorrichtung ein sehr hoher Zerkleinerungsgrad erreicht werden.The arrangement according to the invention ensures that the ground material is rolled over on the unperforated grinding track 14 until the desired degree of comminution is reached. The degree of comminution can be easily and precisely adjusted by specifying the desired distance from the rotor to the grinding track surface changeable. Furthermore, a very high degree of comminution can be achieved with the device according to the invention.

Wie aus der Zeichnung ersichtlich ist, überlappen sich die beiden Mahlbahnen der Läufer 18 und 19 nicht, schließen vielmehr ohne oder mit minimalem Spalt zwischen sich aneinander an. Mit anderen Worten, der Abstand a der vertikalen Außenfläche des inneren Läufers 18 von der Kollergang-Mittelachse ist gleich oder geringfügig kleiner als der Abstand b der inneren Vertikalfläche des äußeren Läufers 19 von der Kollergang-Mittelachse. Mathematisch ausgedrückt gilt also a ≦ b.As can be seen from the drawing, the two grinding tracks of the rotors 18 and 19 do not overlap, but rather connect with one another with no or with a minimal gap. In other words, the distance a of the vertical outer surface of the inner runner 18 from the central runner axis is equal to or slightly less than the distance b of the inner vertical surface of the outer runner 19 from the central runner axis. Expressed mathematically, a ≦ b holds.

Die innere Mahlbahnfläche 14a wird daher ausschließlich vom Innenläufer 18, die äußere Mahlbahnfläche 14b ausschließlich vom Außenläufer 19 überrollt. Die Abnutzung der inneren Mahlbahnfläche 14a und diejenige der äußeren Mahlbahnfläche 14b und der Läuferflächen 18 und 19 ist deshalb äußerst gleichmäßig. Auch die Abnutzungen der beiden Mahlbahnflächen 14a, 14b über den Läuferflächen 18, 19 untereinander weicht nur noch sehr geringfügig voneinander ab, weil erfindungsgemäß beide Mahlbahnabschnitte 14a, 14b von ungelochten, durchgehenden Ring-Platten gebildet sind, deren Gesamtbelastung im wesentlichen gleich ist. Eine geringfügig ungleichmäßige Belastung der Mahlbahnfläche 14 ergibt sich lediglich noch daraus, daß die Verweilzeiten des Mahlgutes in den jeweiligen Abschnitten 14a und 14b und die mittleren Umlaufbahnlängen für die beiden Läufer 18 und 19 leicht voneinander abweichen. Die Läuferflächen 18 und 19 nutzen sich außerdem verschieden ab, weil sie verschiedene Rollbereiche und verschiedenes Rollverhalten aufweisen. Dadurch aber, daß die beiden Mahlbahnflächen 14a, 14b und Läuferflächen 18 und 19 gesonderte Bauteile sind, ergeben sich aus der ungleichmäßigen Abnutzung keinerlei Schwierigkeiten; es wird eben jede Mahlbahnfläche unabhängig von der anderen nach Bedarf ausgewechselt.The inner grinding track surface 14a is therefore only rolled over by the inner rotor 18, the outer grinding track surface 14b exclusively by the outer rotor 19. The wear of the inner grinding surface 14a and that of the outer grinding surface 14b and the rotor surfaces 18 and 19 is therefore extremely uniform. The wear of the two grinding track surfaces 14a, 14b above the rotor surfaces 18, 19 also differs only slightly from one another, because according to the invention both grinding track sections 14a, 14b are formed by unperforated, continuous ring plates, the total load of which is essentially the same. A slightly uneven loading of the grinding track surface 14 results only from the fact that the dwell times of the ground material in the respective sections 14a and 14b and the mean orbit lengths for the two runners 18 and 19 differ slightly from one another. The rotor surfaces 18 and 19 also wear differently because they have different rolling areas and different rolling behavior. However, the fact that the two grinding track surfaces 14a, 14b and rotor surfaces 18 and 19 are separate components results in no difficulties from the uneven wear; each grinding track surface is replaced independently of the other as required.

Von besonderer Bedeutung ist weiterhin, daß die Mittelsäule 10 einen beträchtlichen Durchmesser hat, derart, daß sie die Mahlbahn-Platte 14 bzw. den Tragboden 12 in etwa im Zentrum des äußeren Läufers 19 unterstützt. Mit anderen Worten, der Radius der Mittelsäule 10 ist gleich oder größer als der Radius des Mittelpunkts des äußeren Läufers 18, jeweils bezogen auf die Mittelachse des Kollergangs. Der Tragboden 12 wird dabei so bemessen, daß innere und äußere Mahlbahnflächen 14a, 14b vollständig durch den Tragboden 12 abstützt sind; damit wird erreicht, daß die Mahlbahn-Platte 14 mit einer vergleichsweise einfachen und leichten Unterstützung auskommt. Bei den bekannten Kollergängen dieser Bauart war es dagegen so, daß die Mittelsäule vergleichsweise schlank war und für die Unterstützung der Mahlbahn aufwendige und schwere Trägerkonstruktionen erforderlich waren, nämlich Trägerkonstruktionen mit einem Gewicht von mehreren Tonnen. Die erfindungsgemäße Konstruktion erbringt demgegenüber eine beträchtliche Gewichts- und Kostenersparnis.It is also of particular importance that the center column 10 has a considerable diameter, such that it the grinding track plate 14 or the support base 12 approximately in the center of the outer runner 19 supported. In other words, the radius of the center column 10 is equal to or greater than the radius of the center point of the outer rotor 18, in each case with respect to the center axis of the pan mill. The support base 12 is dimensioned such that inner and outer grinding track surfaces 14a, 14b are completely supported by the support base 12; this ensures that the grinding track plate 14 manages with a comparatively simple and easy support. In the known pan mill of this type, however, it was the case that the central column was comparatively slim and complex and heavy support structures were required to support the grinding track, namely support structures with a weight of several tons. In contrast, the construction according to the invention results in considerable weight and cost savings.

Die die Mahlbahnfläche 14 mit Abstand umgebende Seitenwand 17 verhindert, daß Material seitlich über den Rand des Kollergang austritt, und dient darüberhinhaus als Schutz gegen die rotierenden Läufer 18, 19. Zwischen der Seitenwand 17 und der Mahlbahn 14 können Querstege, Konsolen oder ähnliches zur Bildung des Abwurfbereiches 21 vorgesehen sein. Die Seitenwand 17 kann ferner radial verschiebbar gelagert sein, um den Abwurfbereich nach Bedarf zu vergrößern oder zu verkleinern.The side wall 17 surrounding the grinding track surface 14 at a distance prevents material from escaping laterally over the edge of the pan pass, and moreover serves as protection against the rotating runners 18, 19 of the dropping area 21 may be provided. The side wall 17 can also be mounted in a radially displaceable manner in order to enlarge or reduce the discharge area as required.

Claims (8)

  1. An edge mill for processing wet ceramic substances, more particularly brick clay, comprising a horizontal grinding track (14) in the form of a circular disc carried by a carrier base (12) supported centrally on a vertical middle column (10), having an inner and an outer rotor (18, 19) rotating on the track (14) in the peripheral direction thereof, a vertical kingpin (15) centrally driving the rotors, having guide surfaces (24, 25) which trail the rotors in the direction of movement thereof and which are so set that the material for milling over which the rotors roll moves outwardly in spiral form on the grinding track, and having a material feed (23) which continuously supplies the material for milling to the said track, characterised in that the grinding track (14) is an imperforate annular plate, in that the outer ghuide surface (25) trailing the outer rotor (19) is so adjustable between two positions that the material for milling over which the outer rotor (19) rolls moves, in one position, outwardly and over the outer edge of the grinding track (14) into a discharge zone (21) or, in the other position, moves inwardly back in the direction of rotation to a position in front of one of the rotors (18, 19), and in that a measuring device detects the vertical distance between the outer rotor (19) and the grinding track surface (14) and an adjusting device changes the position of the outer guide surface (25) in dependence on the detected distance.
  2. An edge mill according to Claim 1, characterised in that the material feed (23) is so arranged and driven by the kingpin (15) that the material for milling is positively feedable onto the grinding track (14) solely directly in front of the inner rotor (18).
  3. An edge mill according to Claim 1 or 2, characterised in that the inside radius of the annular rolling path of the outer rotor (19) is equal to or greater than the outside radius of the annular rolling path of the inner rotor (18).
  4. An edge mill according to any one of the preceding claims, characterised in that the grinding track (14) is subdivided into an inner grinding track surface (14a) and an outer grinding track surface (14b), the inner grinding track surface being associated with the rolling path of the inner rotor (18) and the outer grinding track surface being associated with the rolling path of the outer rotor (19).
  5. An edge mill according to any one of the preceding claims, characterised in that the middle column (10) has a radius equal to or larger than the radius of the centre of the outer rotor (19), in each case relative to the central perpendicular of the edge mill, the supporting base (12) supported on the middle column (10) having an outside radius which is equal to or slightly greater than the outside radius of the outer grinding track surface (14).
  6. An edge mill according to any one of the preceding claims, characterised by an inner and outer vertically adjustable material guide element (26, 27) leading on the inner and outer rotor (18 and 19) respectively in the direction of rotation.
  7. An edge mill according to any one of the preceding claims, characterised by a filter screen disposed at the periphery of the grinding track (14) in the discharge zone (21) between the collecting plate (22) and the grinding track periphery.
  8. An edge mill according to any one of the preceding claims, characterized in that a collecting plate (22) disposed beneath the grinding track (14) is rotatable in a direction opposed to the direction of rotation of the rotors (18, 19).
EP93112896A 1992-09-04 1993-08-11 Edge mill Expired - Lifetime EP0591649B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4229488A DE4229488C1 (en) 1992-09-04 1992-09-04 Pan mill
DE4229488 1992-09-04

Publications (2)

Publication Number Publication Date
EP0591649A1 EP0591649A1 (en) 1994-04-13
EP0591649B1 true EP0591649B1 (en) 1996-11-20

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EP93112896A Expired - Lifetime EP0591649B1 (en) 1992-09-04 1993-08-11 Edge mill

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EP (1) EP0591649B1 (en)
AT (1) ATE145350T1 (en)
DE (2) DE4229488C1 (en)
ES (1) ES2095534T3 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4442099C2 (en) * 1994-11-25 1997-08-14 Loesche Gmbh Roller mill

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE596417C (en) * 1934-05-08 W & J Scheid Mixing device at Kollergaengen
DE487481C (en) * 1929-12-07 W & J Scheid Mixing and emptying device on Kollergaengen consisting of scrapers rotating with the grinding bodies
DE1976039U (en) * 1967-10-24 1967-12-28 Gelsenkirchener Bergwerks Ag KOLLERGANG, IN PARTICULAR FOR CRUSHING HARD MATERIALS, IN PARTICULAR COCK GROUND.
FR2376093A1 (en) * 1976-12-28 1978-07-28 Poudres & Explosifs Ste Nale Continuous grinder for explosive powder - having hoppers continuously discharging onto trough base between rollers and axis
DE3640081A1 (en) * 1986-11-24 1988-06-01 Rieter Werke Haendle KOLLERGANG
DE3806725A1 (en) * 1988-03-02 1989-09-14 Rupert Dipl Ing Sogl Device for edge-mill charging and discharging
DE9017356U1 (en) * 1990-12-22 1991-03-21 Frank Engineering Gmbh Automatisierungstechnik, 5902 Netphen, De

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ES2095534T3 (en) 1997-02-16
ATE145350T1 (en) 1996-12-15
DE4229488C1 (en) 1994-02-17
EP0591649A1 (en) 1994-04-13
DE59304530D1 (en) 1997-01-02

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