EP0380952A2 - Partitioning wall for a drum mill - Google Patents
Partitioning wall for a drum mill Download PDFInfo
- Publication number
- EP0380952A2 EP0380952A2 EP90100762A EP90100762A EP0380952A2 EP 0380952 A2 EP0380952 A2 EP 0380952A2 EP 90100762 A EP90100762 A EP 90100762A EP 90100762 A EP90100762 A EP 90100762A EP 0380952 A2 EP0380952 A2 EP 0380952A2
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- European Patent Office
- Prior art keywords
- wall
- tube mill
- partition according
- wear
- rear wall
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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.)
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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 according to the preamble of claim 1.
- Such tube mill partitions are generally known, reference being made only to DE-PS 24 47 262, for example.
- the partitions usually consist of a front, upstream diaphragm wall and a downstream rear wall, which in the present case is considered to be largely closed.
- An air passage opening extends in the central area between the diaphragm wall and the rear wall and is largely closed for guiding the air flow in the axial direction.
- the interior space between the diaphragm and rear wall, in which the lifting blades for the regrind are attached, is therefore easy to assemble and difficult to access for maintenance purposes.
- the invention is therefore based on the object , in particular a tube mill partition as a transfer or discharge wall in particular to design their diaphragm wall with improved wear protection and ease of assembly and maintenance.
- An essential idea of the invention is directed to equipping the walls and in particular the diaphragm wall with a plurality of segmented wall rings which are assigned to one another radially. Due to this construction it is e.g. possible to keep the radial extension of the wall rings different and to be able to adapt the ring segments or slotted plates specifically to the wear. Since the maximum wear ranges are approximately known to the person skilled in the art due to the material to be ground, the size of the grinding ball and the other parameters of the exact intended use of a tube mill, e.g. the slotted plates of the radially central ring have a radial dimension which corresponds approximately to the maximum wear range.
- This measure therefore allows only the slotted plates of the middle ring to be replaced after a corresponding operating time, without the outer or inner ring of the slotted wall being affected.
- 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 counterbore e.g. of the wear bar remains.
- 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.
- To attach 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 using a hand tool via an opening in the central air passage. that an axial escape or rotation of the nut is prevented when the tear-off screw is screwed in from the front of the diaphragm wall.
- 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 nut 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 arcuate structure is particularly advantageous in the case of poorly flowing regrinds, the stability of the partition wall construction also being improved by the deviation from the strictly radial construction principle.
- 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, taking into account a more frequent replacement of the wear bars. so 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.
- 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 ne line is indicated at the latest, however, when dismantling 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)
Abstract
Die Erfindung betrifft eine Rohrmühlen-Trennwand als Übertrags- oder Austragstrennwand. Im Hinblick auf eine Verschleißreduzierung, aber hohe Wartungsfreundlichkeit, geht man den Weg, separate Schleißbalken (10) einzusetzen und diese bzw. die Schlitzplatten (2) ohne anderweitige Montageöffnung leicht austauschen zu können.
Description
Die Erfindung betrifft eine Rohrmühlen-Trennwand gemäß Oberbegriff des Anspruchs 1.The invention relates to a tube mill partition according to the preamble of claim 1.
Derartige Rohrmühlen-Trennwände sind allgemein bekannt, wobei nur beispielsweise auf die DE-PS 24 47 262 hingewiesen wird.Such tube mill partitions are generally known, reference being made only to DE-PS 24 47 262, for example.
Die Trennwände bestehen üblicherweise aus einer vorderen, stromaufwärts gelegenen Schlitzwand und einer stromabwärts gelegenen Rückwand, die im vorliegenden Fall als weitgehend geschlossen angesehen wird. Zwischen Schlitzwand und Rückwand erstreckt sich im zentralen Bereich eine Luftdurchtrittsöffnung, die zur Luftstromführung in axialer Richtung weitgehend geschlossen ausgebildet ist. Der zwischen Schlitz- und Rückwand vorhandene Innenraum, in dem die Hubschaufeln für das Mahlgut angebracht sind, ist daher montagemäßig und für Wartungszwecke nur schwer zugänglich.The partitions usually consist of a front, upstream diaphragm wall and a downstream rear wall, which in the present case is considered to be largely closed. An air passage opening extends in the central area between the diaphragm wall and the rear wall and is largely closed for guiding the air flow in the axial direction. The interior space between the diaphragm and rear wall, in which the lifting blades for the regrind are attached, is therefore easy to assemble and difficult to access for maintenance purposes.
Bisher bedurfte es daher mindestens eines teilweisen Ausbaues des zentralen Luftstromkanals oder Mittelteils der Trennwand, um hierüber einen Zugriff auf die Innenseite von Schlitz- und Rückwand zu schaffen, was insbesondere bei Schraubbefestigungen von einzelnen Ringsegmenten der Wände erforderlich war.So far, it has therefore been necessary to at least partially expand the central airflow duct or central part of the partition wall in order to provide access to the inside of the diaphragm and rear wall, which was particularly necessary for screw fastenings of individual ring segments of the walls.
Diese Montageprobleme traten vor allen Dingen dann eklatant zutage, wenn einzelne Schlitzplatten aufgrund zu hohen Verschleißes ausgewechselt werden mußten.These assembly problems were particularly apparent when individual slotted plates had to be replaced due to excessive wear.
Der Erfindung liegt daher die Aufgabe zugrunde, eine Rohrmühlen-Trennwand als Übertrags- oder Austragswand, insbe sondere deren Schlitzwand, mit verbessertem Verschleißschutz und hoher Montage- und Wartungsfreundlichkeit zu konzipieren.The invention is therefore based on the object , in particular a tube mill partition as a transfer or discharge wall in particular to design their diaphragm wall with improved wear protection and ease of assembly and maintenance.
Diese Aufgabe wird erfindungsgemäß durch die Merkmale des kennzeichnenden Teils des Anspruchs 1 gelöst.This object is achieved by the features of the characterizing part of claim 1.
Ein wesentlicher Gedanke der Erfindung ist darauf gerichtet, die Wände und insbesondere die Schlitzwand, mit mehreren, radial einander zugeordneten segmentierten Wandringen auszustatten. Aufgrund dieser Konstruktion ist es z.B. möglich, die radiale Erstreckung der Wandringe unterschiedlich zu halten und die Ringsegmente bzw. Schlitzplatten gezielt auf die Verschleißbeanspruchung anpassen zu können. Da die maximalen Verschleißbereiche dem Fachmann aufgrund des Mahlgutes, der Mahlkugelgröße und der weiteren Parameter des genauen Verwendungszweckes einer Rohrmühle in etwa bekannt sind, können z.B. die Schlitzplatten des radial mittleren Ringes eine radiale Abmessung aufweisen, die etwa dem maximalen Verschleißbereich entspricht.An essential idea of the invention is directed to equipping the walls and in particular the diaphragm wall with a plurality of segmented wall rings which are assigned to one another radially. Due to this construction it is e.g. possible to keep the radial extension of the wall rings different and to be able to adapt the ring segments or slotted plates specifically to the wear. Since the maximum wear ranges are approximately known to the person skilled in the art due to the material to be ground, the size of the grinding ball and the other parameters of the exact intended use of a tube mill, e.g. the slotted plates of the radially central ring have a radial dimension which corresponds approximately to the maximum wear range.
Diese Maßnahme erlaubt es daher nur die Schlitzplatten des mittleren Ringes nach entsprechender Betriebszeit auszutauschen, ohne daß der äußere oder innere Ring der Schlitzwand davon betroffen wäre.This measure therefore allows only the slotted plates of the middle ring to be replaced after a corresponding operating time, without the outer or inner ring of the slotted wall being affected.
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 Schleißbalken an, die über die Fläche der entsprechenden Wand hervorstehen. Diese Schleißbalken, die eine Abweisfunktion, insbesondere für Mahlkugeln, haben, werden 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 werden.Since an essential factor of wear on the slotted plates, which also applies in a similar way to the rear wall plates, is the impact of grinding balls and ground material from the approximately "kidney-shaped" raised grinding ball filling, it is brought approximately in the radial direction between slotted plates Wear bars that protrude over the surface of the corresponding wall. These wear bars, which have a repelling function, in particular for grinding balls, are preferably installed between the slot plates most affected by wear. The wear bars can be between successive slotted plates or also several slot plates following in the circumferential direction can 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 counterbore 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.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.
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.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. To attach 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 using a hand tool via an opening in the central air passage. that an axial escape or rotation of the nut is prevented when the tear-off screw is screwed in from the front of the diaphragm wall. 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 nut 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 arcuate structure is particularly advantageous in the case of poorly flowing regrinds, the stability of the partition wall construction also being improved by the deviation from the strictly radial construction principle.
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, taking into account a more frequent replacement of the wear bars. so 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.
- Figure 1 is 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.
- 2 shows an axial section through the area II-II according to FIG. 1, showing a cutout from the rear wall;
- Fig. 3 is an enlarged view of area III of Fig. 2 with a tear-off screw and nut holder provided on the inside and
- Fig. 4 is 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-
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 recesses 4 of the rust-like slit plates 3, only a few elongate openings 5 running in the circumferential direction are shown, for example. These openings 5 serve to flow through the comminuted ground material.
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
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.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 unterbroche ne 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 (12)
dadurch gekennzeichnet,
daß mindestens die Schlitzwand (1) radial mehrere Ringsegmente aus Schlitzplatten (2,3) aufweist, daß im Bereich hohen Verschleißes zwischen Schlitzplatten (2,3) etwa radial orientierte Schleißbalken (10) vorgesehen sind, die aus der Ebene der Schlitzwand (1) mindestens geringfügig überstehen, und
daß mindestens die im Innenraum der Trennwand mit Muttern (26) endenden Schraubbefestigungen (25), insbesondere für die Schlitzplatten (2,3) und/oder die Schleißbalken (10), mindestens drehgesichert sind.1. Rohrmühlen-partition wall as a transfer or discharge wall with a front diaphragm wall and a downstream, essentially closed rear wall, the slot and rear wall are each constructed in the manner of a ring segment, with a central, axially largely closed air passage opening and with approximately radial between the slot and rear wall oriented lifting blades,
characterized by
that at least the diaphragm wall (1) has a plurality of ring segments made of slotted plates (2, 3) radially, and that in the area of high wear between slotted plates (2, 3) there are approximately radially oriented wear bars (10) which extend from the plane of the diaphragm wall (1) survive at least slightly, and
that at least the screw fastenings (25) ending in the interior of the partition with nuts (26), in particular for the slotted plates (2, 3) and / or the wear bars (10), are at least secured against rotation.
dadurch gekennzeichnet,
daß die drehgesicherten Muttern (26) eine aufhebbare Axialsicherung (29) aufweisen.2. tube mill partition according to claim 1,
characterized by
that the rotationally secured nuts (26) have a reversible axial lock (29).
dadurch gekennzeichnet,
daß die Hubschaufeln (22) mindestens radial bogenförmig verlaufen und schlitzwand- und rückwandseitig für Ringsegmente, Schlitzplatten und/oder Schleißbalken flächen parallele Befestigungsflansche (23,24) zur Schlitzwand (1) und Rückwand (20) aufweisen.3. tube mill partition according to claim 1 or 2,
characterized by
that the lifting blades (22) run at least radially in an arc shape and face the slit wall and rear wall for ring segments, slotted plates and / or wear bars Have parallel mounting flanges (23, 24) to the diaphragm wall (1) and rear wall (20).
dadurch gekennzeichnet,
daß die radialen Randbereiche (7,8) der Ringplatten, Schlitzplatten (2,3) und/oder Schleißbalken (10) dem bogenförmigen Verlauf der Hubschaufeln (22) angepaßt sind.4. tube mill partition according to one of claims 1 to 3,
characterized by
that the radial edge areas (7, 8) of the ring plates, slotted plates (2, 3) and / or wear bars (10) are adapted to the curved shape of the lifting blades (22).
dadurch gekennzeichnet,
daß die Schleißbalken (10) im Bereich der Befestigungsflansche (23,24) der Hubschaufeln (22) mit zur Rückwand (20) insbesondere durchgehenden Schraubverbindungen (15) befestigt sind.5. tube mill partition according to one of claims 1 to 4,
characterized by
that the wear bars (10) are fastened in the region of the fastening flanges (23, 24) of the lifting blades (22) with screw connections (15) which are in particular continuous to the rear wall (20).
dadurch gekennzeichnet,
daß die Schleißbalken (10) aus hartem, verschleißfestem Material, insbesondere gehärtetem Stahl, bestehen.6. tube mill partition according to one of claims 1 to 5,
characterized by
that the wear bars (10) consist of hard, wear-resistant material, in particular hardened steel.
dadurch gekennzeichnet,
daß die Schraubverbindungen (15,25) schlitzwandseitig Abreißschrauben als Senkkopfschrauben aufweisen.7. tube mill partition according to one of claims 1 to 6,
characterized by
that the screw connections (15, 25) have tear-off screws on the slot wall as countersunk screws.
dadurch gekennzeichnet,
daß die Dreh- (27) und Axialsicherung (29) der Muttern (26) als Mutterkäfig ausgelegt ist und an der Innenwand der Schlitzwand, insbesondere der Befestigungsflansche, befestigt ist.8. tube mill partition according to one of claims 1 to 7,
characterized by
that the rotation (27) and axial locking (29) of the nuts (26) is designed as a nut cage and is fastened to the inner wall of the diaphragm wall, in particular the fastening flanges.
dadurch gekennzeichnet,
daß die Drehsicherung (27) der Muttern (26) als Mutterkontur angepaßte, polygonale Buchse (27) ausgelegt ist, die auf der Innenwand der Schlitzwand befestigt. insbesondere angeschweißt ist, oder daß die Mutter selbst angeschweißt ist.9. tube mill partition according to one of claims 1 to 8,
characterized by
that the rotation lock (27) of the nuts (26) is designed as a nut contour adapted, polygonal socket (27) which fastens on the inner wall of the diaphragm wall. is welded in particular, or that the nut itself is welded.
dadurch gekennzeichnet,
daß die Axialsicherung (29) der Mutter (26) als quer zur Achse der Schraubverbindung, insbesondere in der Drehsicherung aufgenommener Stift (29), z.B. als Kunststoffstift oder Metalldraht, ausgebildet ist.10. tube mill partition according to one of claims 1 to 9,
characterized by
that the axial lock (29) of the nut (26) is designed as a pin (29), transversely to the axis of the screw connection, in particular in the rotation lock, for example as a plastic pin or metal wire.
dadurch gekennzeichnet,
daß die Hubschaufeln (22) in axialer Richtung eine Schrägstellung aufweisen.11. tube mill partition according to one of claims 1 to 10,
characterized by
that the lifting blades (22) have an inclined position in the axial direction.
dadurch gekennzeichnet,
daß die Schleißbalken (10) auch auf der Rückwand (20) vorgesehen sind.12. tube mill partition according to one of claims 1 to 11,
characterized by
that the wear bars (10) are also provided on the rear wall (20).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3903255 | 1989-02-03 | ||
| DE3903255A DE3903255A1 (en) | 1989-02-03 | 1989-02-03 | PIPE MILL PARTITION |
| DE8901231U DE8901231U1 (en) | 1989-02-03 | 1989-02-03 | Tube mill partition |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0380952A2 true EP0380952A2 (en) | 1990-08-08 |
| EP0380952A3 EP0380952A3 (en) | 1990-10-10 |
| EP0380952B1 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) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996000127A1 (en) * | 1994-06-24 | 1996-01-04 | Slegten Societe Anonyme | Device for holding standard cast grates of existing partitions frames in tube mills |
| CN108704722A (en) * | 2018-06-08 | 2018-10-26 | 中信重工机械股份有限公司 | A kind of large-size autogenous mill/semi-autogenous mill wear-resistant liner |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| RU2236299C1 (en) * | 2003-01-15 | 2004-09-20 | Пенкин Николай Семенович | Bead mill rubberized disk |
| RU2283181C2 (en) * | 2004-07-08 | 2006-09-10 | Виктор Михайлович Сербин | Gummed rotor of bead 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/en 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
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996000127A1 (en) * | 1994-06-24 | 1996-01-04 | Slegten Societe Anonyme | Device for holding standard cast grates of existing partitions frames in tube mills |
| 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. |
| US5829693A (en) * | 1994-06-24 | 1998-11-03 | Slegten Societe Anonyme | Device for holding standard cast grates of existing partitions frames in tube mills |
| CN108704722A (en) * | 2018-06-08 | 2018-10-26 | 中信重工机械股份有限公司 | A kind of large-size autogenous mill/semi-autogenous mill wear-resistant liner |
Also Published As
| Publication number | Publication date |
|---|---|
| ES2042079T3 (en) | 1993-12-01 |
| DE8901231U1 (en) | 1989-03-23 |
| EP0380952A3 (en) | 1990-10-10 |
| US5016826A (en) | 1991-05-21 |
| EP0380952B1 (en) | 1993-05-26 |
| DE3903255A1 (en) | 1990-08-09 |
| IT1229453B (en) | 1991-08-08 |
| JPH0729065B2 (en) | 1995-04-05 |
| DK0380952T3 (en) | 1993-10-04 |
| JPH02233154A (en) | 1990-09-14 |
| IT8920796A0 (en) | 1989-06-06 |
| DE3903255C2 (en) | 1991-09-05 |
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