EP0380952B1 - Partitioning wall for a drum mill - Google Patents
Partitioning wall for a drum mill Download PDFInfo
- Publication number
- EP0380952B1 EP0380952B1 EP90100762A EP90100762A EP0380952B1 EP 0380952 B1 EP0380952 B1 EP 0380952B1 EP 90100762 A EP90100762 A EP 90100762A EP 90100762 A EP90100762 A EP 90100762A EP 0380952 B1 EP0380952 B1 EP 0380952B1
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- European Patent Office
- Prior art keywords
- slotted
- wall
- tube mill
- nut
- partition according
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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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- 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
Definitions
- the invention relates to a tube mill partition as a transfer or discharge wall according to the preamble of claim 1.
- Such a tube mill partition is known from WO-A-86/04 526.
- a slot and a rear wall form a discharge chamber in which lifting blades are arranged almost radially. Since the mill works in the wet process and with a ball filling, for example, the central opening on the slot wall is sealed with a disk.
- the regrind is discharged via an axially arranged discharge blade which interacts with the lifting blades and projects into the discharge chamber.
- the concentric ring segments of the diaphragm wall are wedged with radially oriented, protector-like and protruding elements which, together with protruding ribs, are intended to counter wear of the diaphragm wall segments. In the area of the wedge-like wear bars, continuous screw fastenings are provided up to the rear wall.
- a lifting wall for installation in a tube mill with a central transfer cone in an air passage opening is known, in which the individual lifting blades are provided with radially adjustable lifting blades between a diaphragm wall and a substantially closed rear wall.
- the transfer cone consists of segments on which side plates are attached for fastening the adjustable lifting blades. It is fastened with the help of a countersunk screw and a nut to be subsequently secured, which is arranged in a correspondingly large hole. An actuation of the screw fastening solely from the screw head side is not possible with this construction.
- the invention has for its object to develop a generic tube mill partition, which in particular has improved wear protection, so that it is particularly easy to install and maintain.
- this object is achieved in a tubular mill partition with a front diaphragm wall and a downstream, essentially closed rear wall and with approximately radially oriented lifting blades between the diaphragm and rear wall, the diaphragm and rear wall in each case are constructed in the manner of a ring segment and at least the diaphragm wall has a plurality of concentric ring segments made of diaphragm plates, with approximately radially oriented wear bars between the diaphragm plates, which protrude at least slightly from the plane of the diaphragm wall and with screw fastenings for the wear bars which extend through to the rear wall in such a way that the lifting vanes for the slot - And rear wall have surface-parallel mounting flanges, in the area of which the ring segments of the slotted and rear wall and the wear bars are fastened, with screw fastenings ending with at least for the slotted plates in the interior of the partition being provided with a lock nut.
- these wear bars have an approximately rectangular shape in axial section and are made of a hard, wear-resistant material.
- Other forms, e.g. Sloping surface for better rejection of regrind and balls are possible.
- the wear bars are kept relatively narrow in comparison to the extent of the individual slotted plates in the circumferential direction and are primarily attached along the lifting blades fixed in the partition. It can expediently be fastened with a tear-off screw which runs from the diaphragm wall to the rear wall and is provided with a nut on the rear wall side.
- a screw with e.g. Hexagon head understood, this hexagon head is turned with the appropriate torque when tightening the screw and a circular countersunk head as the head of the screw in a corresponding countersunk hole e.g. of the wear bar remains.
- the solution according to the invention is discussed with respect to the diaphragm wall.
- the diaphragm wall panels are usually designed as armor panels and suitably consist of a tough, shatterproof material, after a corresponding operating time, a replacement is necessary above all in the maximum wear range.
- a replacement and the reinstallation of a single worn slotted plate has so far been carried out by burning out the corresponding countersunk head of the fastening screw and by knocking through the screw bolt, including on the back Mother in the interior of the partition.
- larger diameters of a partition for example approx. 5 m, considerable disassembly work is required in order to be able to carry out such a nut fixation.
- the invention goes the way to cage-like fixing the nuts on the inside of the corresponding wall structure or the mounting flange of a lifting blade.
- This is suitably done with a polygonal socket adapted to the nut contour, which e.g. is spot welded against the mounting flange. This secures the nut against twisting.
- a pin made of wire or plastic can preferably be inserted into the socket transversely to the axial direction of the screw. The nut is inserted into the socket and secured with a pin.
- Socket and pin for holding the mother can also be realized by a cage or, for example, two wires attached to the inside of the fastening flanges in a bow-like manner.
- the pin or wire thickness is to be interpreted so that a slight axial penetration of the bolt with the mother is possible. With the worn slotted plate removed, it is then possible, for example, to weld a renewed mounting of the nut on the inside of the fastening flanges via this exposed area and to hold the corresponding nut in a cage-like manner.
- the design of the lifting blades which is curved in the radial direction, also has a wear-reducing effect, with an axial oblique position also being preferred.
- This axial inclination ensures that the regrind that has entered the partition wall is rapidly diverted from the inside of the diaphragm wall towards the inside of the rear wall and thus the material flow to the rear wall is promoted.
- this rapid discharge of the ground material reduces the risk of the slots in the slot wall becoming blocked.
- the wear effect on the inside of the diaphragm wall can therefore be reduced.
- the arched structure is particularly advantageous in the case of poorly flowing regrinds, the deviation from the strictly radial construction principle also improving the stability of the partition construction.
- flange regions extending approximately parallel to the surface of the diaphragm wall are preferably provided on the axial edge regions of the lifting blades. These flange areas are suitably adapted to the corresponding fastening areas.
- the slabs of the diaphragm and rear wall as well as the wear bars are attached.
- the wear bars are preferably arranged in the radial direction of the corresponding plate edge in the area of the main wear zones. To increase the stability of the partition, it is fastened with bolts extending through the rear wall. Since one can assume that the rear wall is accessible, a corresponding nut holder is not absolutely necessary there. However, if one takes into account a more frequent replacement of the wear bars, there is also a slot-side fastening with a short tear-off screw and nut holder.
- the concept according to the invention achieves a high degree of serviceability, and cost savings are also achieved by designing the essential wear zones with wear bars.
- a diaphragm wall is fragmentary e.g. shown with a central ring segment 1 in plan view in the flow direction.
- the middle ring segment 1 which can be connected radially inward and radially outward analog segments, has two arc-segment slit plates 2 and 3.
- the plate edge 16 therefore merges into the edge area of the wear bar 10.
- the wear bar 10 made of hard, wear-resistant material is via an upper fastening flange 23 and the lower fastening flange 24 by means of a bolt-like tear-off screw 15 against the rear wall 20 or in a corresponding recess 18 in the rear wall against a wall frame 19 connected thereto.
- the continuous screw bolt therefore contributes to the better stability of the correspondingly constructed tube mill partition.
- three screw bolts with their countersunk heads 12 are used to fasten the wear bar 10.
- the wear block 10, which is approximately cuboid in section, has a countersunk bore 11 on the diaphragm wall side, into which the corresponding head 12 engages with the tear-off screw 15.
- the slotted plates 2, 3 are fixed with similar tear-off screws 25 (FIG. 3) against the flange fastenings 23 of the lifting blades 22. Adjacent to the wear bar 10, for example, two tear-off screws 25 are used to fasten the respective slotted plate 3.
- the countersunk head 13 of the tear-off screw 25 is positively in the countersunk bore 14 of a slotted plate.
- a cage-like bush 27 is e.g. provided welded at 18. A spot or multipoint weld is sufficient for this.
- this bushing 27 is first fixed against the mounting flange. Subsequently, the nut 26 is inserted therein and held in it in a cage-like manner by a pin 29 lying transversely to the axis, twisting and axial displacement of the nut being excluded.
- This type of anti-rotation device can also be used for screw fastening the wear bars.
- the nut 26 held in this way can then be fastened easily from the front of the diaphragm wall and without having to hold the nut with tools in the interior of the partition.
- the pin 29, for example made of plastic, is usually broken when screwing, which is interrupted by the Line is indicated. However, at the latest when disassembling the individual slotted plate 3 and after the corresponding countersunk head 13 of the tear-off screw 25 has been burned out, the axial securing means provided by the pin 29 is destroyed by the application of axial force and penetration of the screw bolt.
- the socket 27 is of course adapted to the outer contour of the nut used.
- the use of the wear bars 10 therefore leads to a reduction in wear e.g. for slotted panels. Due to the maintenance-friendly bracket, there is the possibility of a relatively simple, uncomplicated exchange of individual slotted plates without having to create larger mounting openings in the partition.
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
- Connection Of Plates (AREA)
Description
Die Erfindung betrifft eine Rohrmühlen-Trennwand als Übertrags- oder Austragswand gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a tube mill partition as a transfer or discharge wall according to the preamble of claim 1.
Eine derartige Rohrmühlen-Trennwand ist aus der WO-A-86/04 526 bekannt. Eine Schlitz- und eine Rückwand bilden eine Austragskammer, in der Hubschaufeln nahezu radial angeordnet sind. Da die Mühle im Naßprozeß und mit einer beispielsweise Kugelfüllung arbeitet, ist die schlitzwandseitige zentrale Öffnung mit einer Scheibe abgedichtet. Der Mahlgutaustrag erfolgt über eine mit den Hubschaufeln zusammenwirkenden und in die Austragskammer ragende, axial angeordnete Austragsschaufel. Die konzentrischen Ringsegmente der Schlitzwand sind mit radial orientierten, schleißbalkenähnlichen und überstehenden Elementen verkeilt, die zusammen mit überstehenden Rippen einer Abnützung der Schlitzwandsegmente entgegenwirken sollen. Im Bereich der keilartigen Schleißbalken sind außerdem bis zur Rückwand durchgehende Schraubbefestigungen vorgesehen.Such a tube mill partition is known from WO-A-86/04 526. A slot and a rear wall form a discharge chamber in which lifting blades are arranged almost radially. Since the mill works in the wet process and with a ball filling, for example, the central opening on the slot wall is sealed with a disk. The regrind is discharged via an axially arranged discharge blade which interacts with the lifting blades and projects into the discharge chamber. The concentric ring segments of the diaphragm wall are wedged with radially oriented, protector-like and protruding elements which, together with protruding ribs, are intended to counter wear of the diaphragm wall segments. In the area of the wedge-like wear bars, continuous screw fastenings are provided up to the rear wall.
Wegen dieser konstruktiven Gestaltung der Schleißbalken-Verkeilung der Schlitzwandsegmente gestaltet sich ein Austausch der Schlitzwandsegmente für Reparatur- oder Wartungszwecke relativ umständlich und aufwendig.Because of this constructive design of the wear beam wedging of the diaphragm wall segments, an exchange of the diaphragm wall segments for repair or maintenance purposes is relatively cumbersome and complex.
Aus der FR-A-2 345 213 ist eine Hubwand zum Einbau in eine Rohrmühle mit einem zentralen Überleitkonus in einer Luftdurchtrittsöffnung bekannt, bei der die einzelnen Hubschaufeln zwischen einer Schlitzwand und einer im wesentlichen geschlossenen Rückwand mit radial verstellbaren Hubschaufeln versehen sind. Der Überleitkonus besteht zu diesem Zweck aus Segmenten, an denen Seitenbleche zur Befestigung der verstellbaren Hubschaufeln angebracht sind. Die Befestigung erfolgt mit Hilfe einer Senkschraube und einer nachträglich zu sichernden Mutter, die in einer entsprechend großen Bohrung angeordnet wird. Eine Betätigung der Schraubbefestigung allein von der Schraubenkopfseite her ist bei dieser konstruktiven Ausbildung nicht möglich.From FR-A-2 345 213 a lifting wall for installation in a tube mill with a central transfer cone in an air passage opening is known, in which the individual lifting blades are provided with radially adjustable lifting blades between a diaphragm wall and a substantially closed rear wall. For this purpose, the transfer cone consists of segments on which side plates are attached for fastening the adjustable lifting blades. It is fastened with the help of a countersunk screw and a nut to be subsequently secured, which is arranged in a correspondingly large hole. An actuation of the screw fastening solely from the screw head side is not possible with this construction.
Es erfordert daher mindestens einen teilweisen Ausbau des zentralen Luftstromkanals oder des Mittelteils der Trennwand, um hierüber einen Zugriff auf die Innenseite von Schlitz- und Rückwand zu schaffen. Für die Befestigung einer neu eingesetzten Schlitzplatte bzw. eines Schlitzwandsegmentes ist es daher erforderlich, die entsprechende Mutter auf der Rückwand mit Hilfe eines Handwerkzeuges festzulegen, um ein axiales Entweichen oder eine Drehung der Mutter beim Einschrauben einer Abreißschaube von der Vorderseite der Schlitzwand zu verhindern. Es bedarf daher eines erheblichen Aufwandes, um eine derartige Mutterfixierung durchführen zu können.It therefore requires at least a partial removal of the central air flow duct or the central part of the partition wall in order to provide access to the inside of the diaphragm and rear wall. For fastening a newly inserted slotted plate or a slotted wall segment, it is therefore necessary to fix the corresponding nut on the rear wall using a hand tool in order to prevent axial escape or rotation of the nut when a tear-off screw is screwed in from the front of the slotted wall. It therefore requires considerable effort to be able to carry out such a mother fixation.
Der Erfindung liegt die Aufgabe zugrunde, eine gattungsgemäße Rohrmühlen-Trennwand, die insbesondere einen verbesserten Verschleißschutz aufweist, so weiter zu bilden, daß eine besonders hohe Montage- und Wartungsfreundlichkeit gegeben ist.The invention has for its object to develop a generic tube mill partition, which in particular has improved wear protection, so that it is particularly easy to install and maintain.
Erfindungsgemäß wird diese Aufgabe bei einer Rohrmühlen-Trennwand mit einer vorderen Schlitzwand und stromabwärts gelegener, im wesentlichen geschlossener Rückwand und mit etwa radial orientierten Hubschaufeln zwischen der Schlitz- und Rückwand, wobei die Schlitz- und Rückwand jeweils ringsegmentartig aufgebaut sind und mindestens die Schlitzwand mehrere konzentrische Ringsegmente aus Schlitzplatten aufweist, mit etwa radial orientierten Schleißbalken zwischen den Schlitzplatten, die aus der Ebene der Schlitzwand mindestens geringfügig überstehen und mit bis zur Rückwand durchgehenden Schraubbefestigungen für die Schleißbalken dadurch gelöst, daß die Hubschaufeln zur Schlitz- und Rückwand flächenparallele Befestigungsflansche aufweisen, in deren Bereich die Ringsegmente der Schlitz- und Rückwand und die Schleißbalken befestigt sind, wobei mindestens für die Schlitzplatten im Innenraum der Trennwand endende Schraubbefestigungen mit einer drehgesicherten Mutter vorgesehen sind.According to the invention, this object is achieved in a tubular mill partition with a front diaphragm wall and a downstream, essentially closed rear wall and with approximately radially oriented lifting blades between the diaphragm and rear wall, the diaphragm and rear wall in each case are constructed in the manner of a ring segment and at least the diaphragm wall has a plurality of concentric ring segments made of diaphragm plates, with approximately radially oriented wear bars between the diaphragm plates, which protrude at least slightly from the plane of the diaphragm wall and with screw fastenings for the wear bars which extend through to the rear wall in such a way that the lifting vanes for the slot - And rear wall have surface-parallel mounting flanges, in the area of which the ring segments of the slotted and rear wall and the wear bars are fastened, with screw fastenings ending with at least for the slotted plates in the interior of the partition being provided with a lock nut.
Da ein wesentlicher Faktor des Verschleißes an den Schlitzplatten, was in ähnlicher Weise auch für die Rückwandplatten gilt, durch ein Auftreffen von Mahlkugeln und Mahlgut von der etwa "nierenförmig" hochgezogenen Mahlgut-Kugel-Füllung gegeben ist, bringt man etwa in radialer Richtung zwischen Schlitzplatten die Schleißbalken an, die über die Fläche der entsprechenden Wand hervorstehen. Diese Schleißbalken, die eine Abweisfunktion, insbesondere für Mahlkugeln, haben, sind vorzugsweise zwischen den am meisten durch Verschleiß beeinträchtigten Schlitzplatten angebracht. Die Schleißbalken können dabei zwischen aufeinanderfolgenden Schlitzplatten oder auch mehreren in Umfangsrichtung folgenden Schlitzplatten vorgesehen sein.Since an essential factor of wear on the slotted plates, which also applies in a similar way to the rear wall plates, is caused by the impact of grinding balls and ground material from the approximately "kidney-shaped" raised grinding material-ball filling, one brings about in the radial direction between slotted plates wear bars that protrude above the surface of the corresponding wall. These wear bars, which have a repelling function, in particular for grinding balls, are preferably mounted between the slot plates most affected by wear. The wear bars can be between successive slotted plates or several slit plates following in the circumferential direction can also be provided.
In einfachster Konfiguration haben diese Schleißbalken im Axialschnitt etwa Rechteckform und bestehen aus einem harten, verschleißfesten Material. Andere Formen, mit z.B. Schrägfläche zur besseren Abweisung von Mahlgut und -kugeln, sind möglich.In the simplest configuration, these wear bars have an approximately rectangular shape in axial section and are made of a hard, wear-resistant material. Other forms, e.g. Sloping surface for better rejection of regrind and balls are possible.
Die Schleißbalken sind im Vergleich zur Erstreckung der einzelnen Schlitzplatten in Umfangsrichtung relativ schmal gehalten und werden primär längs der in der Trennwand befestigten Hubschaufeln angebracht. Ihre Befestigung kann zweckmäßigerweise mit einer von der Schlitzwand zur Rückwand durchgehenden Abreißschraube realisiert werden, die rückwandseitig mit einer Mutter versehen ist. Unter einer Abreißschraube wird hierbei eine Schraube mit z.B. Sechskantkopf verstanden, wobei dieser Sechskantkopf beim Anziehen der Schraube mit dem entsprechenden Drehmoment abgedreht wird und ein kreisförmiger Senkkopf als Kopf der Schraube in einer entsprechenden Senkbohrung z.B. des Schleißbalkens vorhanden bleibt.The wear bars are kept relatively narrow in comparison to the extent of the individual slotted plates in the circumferential direction and are primarily attached along the lifting blades fixed in the partition. It can expediently be fastened with a tear-off screw which runs from the diaphragm wall to the rear wall and is provided with a nut on the rear wall side. A screw with e.g. Hexagon head understood, this hexagon head is turned with the appropriate torque when tightening the screw and a circular countersunk head as the head of the screw in a corresponding countersunk hole e.g. of the wear bar remains.
Obwohl auch rückwandseitig ganz vergleichbare und ähnliche Probleme wie auf der Schlitzwandseite bestehen, wird die Lösung gemäß der Erfindung bezogen auf die Schlitzwand diskutiert.
Trotzdem die Schlitzwandplatten üblicherweise als Panzerplatten ausgelegt sind und geeigneterweise aus einem zähen, bruchsicheren Material bestehen, bedarf es nach entsprechender Betriebszeit eines Auswechselns vor allen Dingen im maximalen Verschleißbereich.Although there are quite comparable and similar problems on the rear wall side as on the diaphragm wall side, the solution according to the invention is discussed with respect to the diaphragm wall.
Despite the fact that the diaphragm wall panels are usually designed as armor panels and suitably consist of a tough, shatterproof material, after a corresponding operating time, a replacement is necessary above all in the maximum wear range.
Ein Auswechseln und der erneute Einbau einer einzelnen verschlissenen Schlitzplatte erfolgt bisher durch Ausbrennen des entsprechenden Senkkopfes der Befestigungsschraube und durch Durchschlagen des Schraubenbolzens einschließlich rückseitiger Mutter in den Innenraum der Trennwand. Für die Befestigung einer neu eingesetzten Schlitzplatte ist es daher erforderlich, über eine Öffnung im zentralen Luftdurchtritt die entsprechende Mutter auf der Rückwand des Befestigungsflansches der Hubschaufeln mittels Handwerkzeug so festzulegen, daß ein axiales Entweichen oder eine Drehung der Mutter beim Einschrauben der Abreißschraube von der Vorderseite der Schlitzwand verhindert wird. Bei größeren Durchmessern einer Trennwand,von z.B. ca. 5 m, bedarf es daher eines erheblichen Demontageaufwandes, um eine derartige Mutterfixierung durchführen zu können.A replacement and the reinstallation of a single worn slotted plate has so far been carried out by burning out the corresponding countersunk head of the fastening screw and by knocking through the screw bolt, including on the back Mother in the interior of the partition. For the attachment of a newly inserted slotted plate, it is therefore necessary to fix the corresponding nut on the rear wall of the mounting flange of the lifting blades by means of hand tools via an opening in the central air passage in such a way that an axial escape or a rotation of the nut when screwing in the tear-off screw from the front of the Diaphragm wall is prevented. In the case of larger diameters of a partition, for example approx. 5 m, considerable disassembly work is required in order to be able to carry out such a nut fixation.
Hier geht die Erfindung den Weg, die Muttern auf der Innenseite des entsprechenden Wandgerüstes bzw. des Befestigungsflansches einer Hubschaufel käfigartig festzulegen. Dies geschieht geeigneterweise mit einer der Mutterkontur angepaßten polygonalen Buchse, die z.B. gegen den Befestigungsflansch punktmäßig angeschweißt wird. Dies sichert die Mutter gegen eine Verdrehung. Zur axialen Sicherung kann vorzugsweise ein Stift aus Draht oder Kunststoff quer zur Achsrichtung der Schraube in die Buchse eingebracht werden. Die Mutter wird in die Buchse eingeführt und stiftmäßig gesichert.Here, the invention goes the way to cage-like fixing the nuts on the inside of the corresponding wall structure or the mounting flange of a lifting blade. This is suitably done with a polygonal socket adapted to the nut contour, which e.g. is spot welded against the mounting flange. This secures the nut against twisting. For axial securing, a pin made of wire or plastic can preferably be inserted into the socket transversely to the axial direction of the screw. The nut is inserted into the socket and secured with a pin.
Die Befestigung einer einzelnen Schlitzplatte erfolgt dann in üblicher Weise von der Vorderseite der Schlitzplatte über eine entsprechende Abreißschraube, wobei die Mutter lagegesichert auf der Rückseite der Schlitzwand plaziert ist. Durch diese stationäre Halterung der Mutter entfällt daher jegliche weitere Demontage benachbarter Platten oder sogar des Mittelteils mit der zentralen Luftöffnung.The attachment of a single slotted plate is then carried out in the usual way from the front of the slotted plate using a corresponding tear-off screw, the nut being placed securely on the back of the slotted wall. This stationary mounting of the nut therefore eliminates any further disassembly of adjacent panels or even the central part with the central air opening.
Buchse und Stift zur Halterung der Mutter können auch durch einen Käfig oder beispielsweise zwei bügelartig an der Innenseite der Befestigungsflansche angebrachte Drähte realisiert werden. Die Stift- oder Drahtstärke ist jedoch so auszulegen, daß ein leichtes axiales Durchschlagen des Schraubbolzens mit der Mutter möglich ist. Bei abgenommener verschlissener Schlitzplatte besteht dann die Möglichkeit, über diesen freiliegenden Bereich eine erneute Halterung der Mutter auf der Innenseite der Befestigungsflansche z.B. anzuschweißen und die entsprechende Mutter darin käfigartig zu halten.Socket and pin for holding the mother can also be realized by a cage or, for example, two wires attached to the inside of the fastening flanges in a bow-like manner. The pin or wire thickness is to be interpreted so that a slight axial penetration of the bolt with the mother is possible. With the worn slotted plate removed, it is then possible, for example, to weld a renewed mounting of the nut on the inside of the fastening flanges via this exposed area and to hold the corresponding nut in a cage-like manner.
Verschleißreduzierend wirkt sich auch die in radialer Richtung gebogene Auslegung der Hubschaufeln aus, wobei zudem eine axiale Schrägstellung bevorzugt wird. Durch diese axiale Schrägstellung wird sichergestellt, daß das in die Trennwand gelangte Mahlgut von der Schlitzwand-Innenseite rasch in Richtung zur Rückwand-Innenseite abgeleitet wird und somit der Materialfluß zur Rückwand gefördert wird. Darüber hinaus wird durch diese rasche Ableitung des Mahlgutes die Gefahr eines Verstopfens der Schlitze in der Schlitzwand verringert. In Verbindung mit der in radialer Richtung vorhandenen Bogenstruktur, die das Ableiten des Mahlgutes in den Achsbereich unterstützt, kann daher auf der Innenseite der Schlitzwand die Verschleißwirkung reduziert werden. Die bogenförmige Struktur ist insbesondere bei schwerfließenden Mahlgütern besonders vorteilhaft, wobei durch die Abweichung vom streng radialen Konstruktionsprinzip auch die Stabilität der Trennwandkonstruktion verbessert wird.The design of the lifting blades, which is curved in the radial direction, also has a wear-reducing effect, with an axial oblique position also being preferred. This axial inclination ensures that the regrind that has entered the partition wall is rapidly diverted from the inside of the diaphragm wall towards the inside of the rear wall and thus the material flow to the rear wall is promoted. In addition, this rapid discharge of the ground material reduces the risk of the slots in the slot wall becoming blocked. In conjunction with the arch structure in the radial direction, which supports the discharge of the ground material into the axis area, the wear effect on the inside of the diaphragm wall can therefore be reduced. The arched structure is particularly advantageous in the case of poorly flowing regrinds, the deviation from the strictly radial construction principle also improving the stability of the partition construction.
Zur Vereinfachung des Konstruktionsprinzips der Trennwand werden vorzugsweise an den axialen Randbereichen der Hubschaufeln sich etwa flächenparallel zur Schlitzwand erstreckende Flanschbereiche vorgesehen. Diese Flanschbereiche sind geeigneterweise den entsprechenden Befestigungsbereichen angepaßt. Die Hubschaufeln bilden zusammen mit den entsprechenden Flanschbereichen, die mindestens auf der Vorderseite vorhanden sind, eine Einheit, die gemeinsam montierbar ist. Im Bereich dieser Flanschbereiche werden sowohl die Platten von Schlitz- und Rückwand, aber auch die Schleißbalken befestigt. Diese Befestigungsflansche ermöglichen daher eine relativ flexible Plattenaufteilung, was im Hinblick auf Stabilitätsverbesserungen wünschenswert ist.To simplify the construction principle of the partition wall, flange regions extending approximately parallel to the surface of the diaphragm wall are preferably provided on the axial edge regions of the lifting blades. These flange areas are suitably adapted to the corresponding fastening areas. The lifting blades together with the corresponding flange areas, which are present at least on the front, form a unit that can be assembled together. In the area of these flange areas, the slabs of the diaphragm and rear wall as well as the wear bars are attached. These mounting flanges therefore allow a relative flexible plate division, which is desirable in terms of stability improvements.
Die Schleißbalken werden vorzugsweise in radialer Richtung des entsprechenden Plattenrandes im Bereich der Hauptverschleißzonen angeordnet. Ihre Befestigung wird zur Stabilitätserhöhung der Trennwand mit zur Rückwand durchreichenden Schraubbolzen realisiert. Da man von der Zugängigkeit der Rückwand ausgehen darf, ist eine entsprechende Mutterhalterung dort nicht unbedingt erforderlich. Berücksichtigt man jedoch einen häufigeren Austausch der Schleißbalken, so bietet sich auch dort allein eine schlitzwandseitige Befestigung mit kurzer Abreißschraube und Mutterhalterung an.The wear bars are preferably arranged in the radial direction of the corresponding plate edge in the area of the main wear zones. To increase the stability of the partition, it is fastened with bolts extending through the rear wall. Since one can assume that the rear wall is accessible, a corresponding nut holder is not absolutely necessary there. However, if one takes into account a more frequent replacement of the wear bars, there is also a slot-side fastening with a short tear-off screw and nut holder.
Durch die Installation derartiger Schleißbalken erreicht man an der Schlitzwand eine Funktionstrennung zwischen der eigentlichen Materialüberleitung durch die Schlitzwand in die nächstfolgende Kammer und den zwangsläufig auf die Schlitzwand einwirkenden Verschleißkräften, die nunmehr primär vom Schleißbalken aufgenommen werden. Hierdurch kann man unterschiedlich konzipierte Materialien für die Schlitzplatten und die Schleißbalken verwenden. Ein anderer Kosteneffekt ergibt sich auch durch das geringere Materialvolumen der als Verschleißteil zu betrachtenden Schleißbalken.By installing such wear bars on the diaphragm wall, a functional separation is achieved between the actual material transfer through the diaphragm wall into the next chamber and the wear forces that inevitably act on the diaphragm wall, which are now primarily absorbed by the wear bar. As a result, differently designed materials can be used for the slotted plates and the wear bars. Another cost effect also results from the lower material volume of the wear bars to be regarded as wearing parts.
Mit dem erfindungsgemäßen Konzept erreicht man eine hohe Wartungsfreundlichkeit, wobei zudem Kosteneinsparungen durch gezielte Auslegung der wesentlichen Verschleißzonen mit Schleißbalken erreicht werden.The concept according to the invention achieves a high degree of serviceability, and cost savings are also achieved by designing the essential wear zones with wear bars.
Die Erfindung wird nachstehend anhand eines schematischen Ausführungsbeispiels noch näher erläutert. Es zeigen:
- Fig. 1
- eine axiale Draufsicht auf einen bruchstückartigen Bereich einer Schlitzwand mit z.B. mittlerem Ringsegment, bei dem zwischen benachbarten Schlitzwandplatten ein Schleißbalken vorgesehen ist;
- Fig. 2
- einen axialen Schnitt durch den Bereich II-II nach Fig.1 mit Darstellung eines Rückwand-Ausschnittes;
- Fig. 3
- eine vergrößerte Darstellung des Bereichs III aus Fig. 2 mit einer Abreißschraube und auf der Innenseite vorgesehener Mutterhalterung und
- Fig. 4
- eine Draufsicht auf die Mutterhalterung nach Fig. 3 von unten.
- Fig. 1
- an axial plan view of a fragmentary area of a diaphragm wall with, for example, a central ring segment, in which a wear bar is provided between adjacent diaphragm wall plates;
- Fig. 2
- an axial section through the area II-II of Figure 1 showing a rear wall section;
- Fig. 3
- an enlarged view of area III of FIG. 2 with a tear-off screw and on the inside provided nut holder and
- Fig. 4
- a plan view of the nut holder of FIG. 3 from below.
In Fig. 1 ist eine Schlitzwand bruchstückartig z.B. mit einem mittleren Ringsegment 1 in Draufsicht in Strömungsrichtung dargestellt. Das mittlere Ringsegment 1, dem sich nach radial innen und radial außen analog aufgebaute Segmente anschliessen können, weist zwei bogensegmentartige Schlitzplatten 2 und 3 auf. Zwischen den einander zugewandten Rändern 7,8 dieser Schlitzplatten 2,3 befindet sich ein Schleißbalken 10, dessen radiale Abmessung der der Schlitzplatten 2,3 entspricht. Der Plattenrand 16 geht daher fluchtend in den Randbereich des Schleißbalkens 10 über.In Fig. 1 a diaphragm wall is fragmentary e.g. shown with a central ring segment 1 in plan view in the flow direction. The middle ring segment 1, which can be connected radially inward and radially outward analog segments, has two arc-segment slit plates 2 and 3. Between the mutually facing
In den Vertiefungen 4 der rostartig aufgebauten Schlitzplatten 3 sind nur beispielsweise einige in Umfangsrichtung verlaufende, längliche Öffnungen 5 dargestellt. Diese Öffnungen 5 dienen dem Durchfließen des entsprechend zerkleinerten Mahlgutes.In the
Unter Einbeziehung der Schnittdarstellung längs der Linie II-II nach Fig. 2 ist der aus hartem, verschleißfestem Material bestehende Schleißbalken 10 über einen oberen Befestigungsflansch 23 und den unteren Befestigungsflansch 24 mittels einer bolzenartigen Abreißschraube 15 gegen die Rückwand 20 bzw. in einer entsprechenden Ausnehmung 18 der Rückwand gegen ein damit verbundenes Wandgerüst 19 befestigt. Der durchgehende Schraubbolzen trägt daher zur besseren Stabilität der entsprechend aufgebauten Rohrmühlen-Trennwand bei. Im Beispiel nach Fig. 1 sind drei Schraubbolzen mit ihren Senkköpfen 12 zur Befestigung des Schleißbalkens 10 eingesetzt. Der im Schnitt etwa quaderförmige Schleißbalken 10 trägt auf der Schlitzwandseite eine Senkbohrung 11, in die der entsprechende Kopf 12 mit der Abreißschraube 15 eingreift.Including the sectional view along the line II-II according to FIG. 2, the
Die Schlitzplatten 2,3 werden mit ähnlichen Abreißschrauben 25 (Fig. 3) gegen die Flanschbefestigungen 23 der Hubschaufeln 22 fixiert. Benachbart zum Schleißbalken 10 werden beispielsweise zwei Abreißschrauben 25 zur Befestigung der jeweiligen Schlitzplatte 3 eingesetzt.The slotted plates 2, 3 are fixed with similar tear-off screws 25 (FIG. 3) against the
In der vergrößerten Darstellung nach Fig. 3 liegt der Senkkopf 13 der Abreißschraube 25 formschlüssig in der Senkbohrung 14 einer Schlitzplatte. Auf der Innenseite, in Fig. 3, der unteren Fläche des Befestigungsflansches 23,ist eine käfigartige Buchse 27 z.B. bei 18 verschweißt vorgesehen. Hierzu genügt eine Punkt- bzw. Mehrpunktanschweißung. Bei der Montage wird zunächst diese Buchse 27 gegen den Befestigungsflansch fixiert. Anschließend wird die Mutter 26 darin eingeführt und durch einen quer zur Achse liegenden Stift 29 darin käfigartig gehaltert, wobei eine Verdrehung und Axialverschiebung der Mutter ausgeschlossen ist. Diese Art von Drehsicherung kann auch für die Schraubbefestigung der Schleißbalken verwendet werden.In the enlarged representation according to FIG. 3, the countersunk
Die so gehalterte Mutter 26 kann dann von der Vorderseite der Schlitzwand einfach und ohne daß ein Gegenhalten der Mutter mit Werkzeug im Innenraum der Trennwand erforderlich ist, befestigt werden.The
Der z.B. aus Kunststoff bestehende Stift 29 wird üblicherweise beim Verschrauben durchbrochen, was durch die unterbrochene Linie angedeutet ist. Spätestens jedoch bei der Demontage der einzelnen Schlitzplatte 3 und nach dem Ausbrennen des entsprechenden Senkkopfes 13 der Abreißschraube 25 wird durch axiale Kraftaufwendung und Durchschlagen des Schraubbolzens die durch den Stift 29 vorhandene Axialsicherung zerstört.The
Die Buchse 27 ist selbstverständlich der Außenkontur der verwendeten Mutter angepaßt.The
Der Einsatz der Schleißbalken 10 führt daher zu einer Reduzierung des Verschleißes z.B. bei Schlitzplatten. Aufgrund der wartungsfreundlichen Halterung bietet sich die Möglichkeit eines relativ einfachen unkomplizierten Austausches auch einzelner Schlitzplatten, ohne daß größere Montageöffnungen in der Trennwand geschaffen werden müssen.The use of the wear bars 10 therefore leads to a reduction in wear e.g. for slotted panels. Due to the maintenance-friendly bracket, there is the possibility of a relatively simple, uncomplicated exchange of individual slotted plates without having to create larger mounting openings in the partition.
Claims (10)
- A tube mill partition as a transfer or discharge wall, with a slotted wall (1) and a substantially closed rear wall (20) positioned oppositely thereto, and with roughly radially oriented lifting blades (22) between the slotted and the rear wall (1, 20), the slotted and rear wall (1, 20) in each case having a ring segmental construction, and at least the slotted wall (1) having several concentric ring segments of slotted plates (2, 3), between the slotted plates (2, 3) with roughly radially oriented wearing beams (10), which project at least slightly out of the plane of the slotted wall (1), and with screw fastenings (15) passing as far as to the rear wall (20) for the wearing beams (10),
characterized in that
the lifting blades (22) have mounting flanges (23, 24) surface-parallel to the slotted and rear walls (1, 20), the ring segments of the slotted and rear walls (1, 20) and the wearing beams (10) being fixed in the vicinity of the mounting flanges, and
screw connections (25) are provided for at least the slotted plates (2, 3), ending in the inner area of the partition wall and having a rotation locked nut (26). - A tube mill partition according to claim 1
characterized in that
the rotation locked nuts (26) have a raisable axial locking means (29). - A tube mill partition according to claim 1 or 2
characterized in that
the screw fastenings (15, 25) have on the slotted wall side break-away screws as countersunk screws. - A tube mill partition according to one of the claims 1 to 3,
characterized in that
the rotation locking means (27) and axial locking means (29) of the nuts (26) is in the form of a nut cage and is fixed to the inside of the slotted wall, particularly to the mounting flanges. - A tube mill partition according to one of the claims 1 to 4,
characterized in that
the rotation locking means (27) for the nuts (26) is constituted like a polygonal bush (27) adapted to the nut contour and being fixed, particularly welded to the inside of the slotted wall, or that the nut itself is welded thereto. - A tube mill partition according to one of the claims 1 to 5,
characterized in that
the axial locking means (29) of the nut (26) is constructed as a pin (29), particularly received in the rotation locking means, running transversely to the axis of the screw fastening, said pin e.g. being a plastic pin or a metal wire. - A tube mill partition according to one of the claims 1 to 6,
characterized in that
the lifting blades (22) have a sloping position in the axial direction. - A tube mill partition according to one of the claims 1 to 7,
characterized in that
the wearing beams (10) are also provided on the rear wall (20). - A tube mill partition according to one of the claims 1 to 8,
characterized in that
the wearing beams (10) are made from hard and wear resistant material, particularly hardened steel. - A tube mill partition according to one of the claims 1 to 9,
characterized in that
the radial marginal areas (7, 8) of the ring plates, slotted plates (2, 3) and/or wearing beams (10) are adapted to the arcuate path of the lifting blades (22).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3903255A DE3903255A1 (en) | 1989-02-03 | 1989-02-03 | PIPE MILL PARTITION |
| DE8901231U DE8901231U1 (en) | 1989-02-03 | 1989-02-03 | |
| DE3903255 | 1989-02-03 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0380952A2 EP0380952A2 (en) | 1990-08-08 |
| EP0380952A3 EP0380952A3 (en) | 1990-10-10 |
| EP0380952B1 true EP0380952B1 (en) | 1993-05-26 |
Family
ID=39363846
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP90100762A Expired - Lifetime EP0380952B1 (en) | 1989-02-03 | 1990-01-15 | Partitioning wall for a drum mill |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US5016826A (en) |
| EP (1) | EP0380952B1 (en) |
| JP (1) | JPH0729065B2 (en) |
| DE (2) | DE8901231U1 (en) |
| DK (1) | DK0380952T3 (en) |
| ES (1) | ES2042079T3 (en) |
| IT (1) | IT1229453B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE1008467A3 (en) * | 1994-06-24 | 1996-05-07 | Slegten Sa | Fixing device on grids standard cast chassis existing walls for tube mill and method for this purpose. |
| US5769338A (en) * | 1994-11-14 | 1998-06-23 | S Fimatec Ltd. | Pulverulent body processing apparatus and method of manufacturing a slit member to be used for the same |
| CN108704722B (en) * | 2018-06-08 | 2020-02-04 | 中信重工机械股份有限公司 | Wear-resistant lining plate for large-scale autogenous mill/semi-autogenous mill |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1440002A (en) * | 1920-02-18 | 1922-12-26 | Francis Dean Bradley | Grinding mill |
| US1769823A (en) * | 1928-11-26 | 1930-07-01 | Born Leon | Grinding machine |
| US2405059A (en) * | 1943-10-11 | 1946-07-30 | Smidth & Co As F L | Indicating device for material treating apparatus |
| DE1507604A1 (en) * | 1966-12-22 | 1969-07-17 | Miag Muehlenbau & Ind Gmbh | Transfer wall of a pipe mill |
| GB1312553A (en) * | 1971-01-15 | 1973-04-04 | Smidth & Co As F L | Grinding mills |
| BE793531A (en) * | 1972-02-02 | 1973-04-16 | Koppers Co Inc | IMPROVEMENTS IN MILLS |
| DE2613062B2 (en) * | 1976-03-26 | 1979-03-01 | Polysius Ag, 4720 Beckum | Lifting wall |
| SU1065015A1 (en) * | 1982-05-05 | 1984-01-07 | Научно-Исследовательский Институт Тяжелого Машиностроения Производственного Объединения "Уралмаш" | Rattler casing |
| CH657074A5 (en) * | 1984-06-14 | 1986-08-15 | Dominique Panissod | SLOT WALL FOR TUBULAR CRUSHER. |
| LU85767A1 (en) * | 1985-02-08 | 1986-09-02 | Communition Tech Comminutec | DEVICE FOR ADJUSTING THE TIME OF RETENTION OF MATERIAL IN A CRUSHER |
-
1989
- 1989-02-03 DE DE8901231U patent/DE8901231U1/de not_active Expired
- 1989-02-03 DE DE3903255A patent/DE3903255A1/en active Granted
- 1989-06-06 IT IT8920796A patent/IT1229453B/en active
-
1990
- 1990-01-15 EP EP90100762A patent/EP0380952B1/en not_active Expired - Lifetime
- 1990-01-15 DK DK90100762.5T patent/DK0380952T3/en active
- 1990-01-15 ES ES199090100762T patent/ES2042079T3/en not_active Expired - Lifetime
- 1990-01-16 US US07/464,134 patent/US5016826A/en not_active Expired - Fee Related
- 1990-02-03 JP JP2024988A patent/JPH0729065B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0729065B2 (en) | 1995-04-05 |
| EP0380952A3 (en) | 1990-10-10 |
| US5016826A (en) | 1991-05-21 |
| DE3903255C2 (en) | 1991-09-05 |
| ES2042079T3 (en) | 1993-12-01 |
| EP0380952A2 (en) | 1990-08-08 |
| DE8901231U1 (en) | 1989-03-23 |
| DK0380952T3 (en) | 1993-10-04 |
| JPH02233154A (en) | 1990-09-14 |
| DE3903255A1 (en) | 1990-08-09 |
| IT8920796A0 (en) | 1989-06-06 |
| IT1229453B (en) | 1991-08-08 |
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