EP0056236A2 - Roller mill, especially for the milling of coal - Google Patents

Roller mill, especially for the milling of coal Download PDF

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Publication number
EP0056236A2
EP0056236A2 EP82100023A EP82100023A EP0056236A2 EP 0056236 A2 EP0056236 A2 EP 0056236A2 EP 82100023 A EP82100023 A EP 82100023A EP 82100023 A EP82100023 A EP 82100023A EP 0056236 A2 EP0056236 A2 EP 0056236A2
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EP
European Patent Office
Prior art keywords
rocker arm
gas
grinding
roller
tight
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP82100023A
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German (de)
French (fr)
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EP0056236A3 (en
EP0056236B1 (en
Inventor
Horst Dipl.-Ing. Brundiek
Ludwig Werner
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Loesche GmbH
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Loesche GmbH
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Priority to AT82100023T priority Critical patent/ATE19861T1/en
Publication of EP0056236A2 publication Critical patent/EP0056236A2/en
Publication of EP0056236A3 publication Critical patent/EP0056236A3/en
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Publication of EP0056236B1 publication Critical patent/EP0056236B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/04—Mills with pressed pendularly-mounted rollers, e.g. spring pressed

Definitions

  • the invention relates to a roller mill, in particular for coal grinding, with a gas-tight mill housing, a rotating grinding table and a plurality of grinding rolls rolling on the grinding table, of which each grinding roll is mounted with a rocker arm about a rocker arm axis.
  • Air or gas usually at a higher temperature than the ambient temperature, flows through the mill.
  • the air or gas is used to dry the regrind and is used as a means of dust transport.
  • the gas enters the connecting piece of a gas chamber below the rotating grinding plate with a blade ring at a higher than atmospheric pressure, generated by a separate blower, flows through the blade ring that surrounds the grinding plate into the grinding chamber, collects ground material there, dries it using the floating gas process and carries the shredded material to the sifter above the grinding chamber.
  • the main idea of the invention is to develop roller mills with a gas-tight housing according to a modular system, which is to be done in such a way that each grinding roller with the parts required for pivoting out is manufactured as a unit, in such a way that each roller mill with a variable number of Rollers can be made without essential changes of the grinding roller with the associated organs for swinging out of the same parts are required.
  • each grinding roller unit it is possible to group the grinding roller with the associated parts for pivoting out around a grinding bowl, it being possible for each grinding roller unit to be preferably arranged on a stand.
  • the task here was to include the rocker arm in the mill housing and to seal it gas-tight, because roller mills for grinding coal in so-called direct injection systems are operated with a hot air stream that has a higher than atmospheric pressure.
  • the invention accordingly consists in that the rocker arm is guided and uncoupled from a fork, at the end of which a force for pressing and lifting the grinding roller is introduced, and the rocker arm is encapsulated and incorporated into the gas-tight mill housing.
  • the rocking lever of the grinding roller and the fork are positively connected to one another during operation by bolts to form a functional unit, the bolts for decoupling the rocking lever from the fork being removably arranged for the maintenance of the grinding roller and the associated parts, so that only the rocker arm takes part in a pivoting movement of the grinding roller to the outside.
  • the gas-tight closure of the rocker arm also has a cover which can be connected in the upper part to the gas-tight housing and whose lower part closes the rocker arm in a curved shape and extends as far as a collar surrounding the roller axis.
  • a sealing air chamber which is guided around the rocker arm axis is arranged on each side of the cover in order to obtain a gas-tight seal against the rocker arm axis.
  • the ratio of the rod force of I i ydrau- likzylinders and the roll separating force is between 50% and 150% by weight.
  • the rocker arm is hollow and is traversed with sealing air which is introduced into the lever at any point outside the grinding chamber, preferably on one end face, from where it is guided to an annular gap between the roller and sleeve of the rocker arm and from here with a high Pressure and high speed enters the grinding chamber.
  • a grinding roller unit is arranged on a load-bearing bracket.
  • a basic form of a roller mill can optionally be equipped with two or more grinding rollers, with a fundamental modification of the grinding roller unit for two or more grinding rollers. is not required.
  • This advantage is connected with an absolute gas tightness of the roller mill and devices in order to be able to swing out all or one grinding roller for maintenance purposes.
  • Fig. 1 shows a schematic representation of a roller mill designed in a known manner with two grinding rollers 1, with the stands 9, of which several are arranged around the grinding bowl 10.
  • the gas-tight mill housing 12 In the area of the grinding rollers 1 there is the gas-tight mill housing 12 and the removable cover 11 for the pivoting out of the grinding rollers 1.
  • the grinding roller 1 On the left side, the grinding roller 1 'is shown in dashed lines in the pivoted-out position.
  • the classifier housing 50 with the classifier 51 is arranged above the gas-tight housing 12.
  • the outlet 52 for the hot air flow is identified by the number 52.
  • the arrow 53 indicates the path of the feed material, namely the raw coal fed into the mill.
  • the hot air flow is fed to the grinding chamber through the blade ring 56, which is fastened to the mill housing 12 in this exemplary embodiment.
  • Embodiments are also possible in which the blade ring is attached to the grinding table 10.
  • FIG. 2 already shows essential parts of the invention, but these are shown in more detail in FIG. 3.
  • the drawing shows a side view of the grinding roller 1 on the grinding bowl 10, which is designated 1 'in the pivoted-out position.
  • the rocker arm 2 carries the axis of the grinding roller 1, which is shown in section in Fig. 3.
  • the rocker arm 2 is located within a gas-tight cover 11, which is removably attached to the housing wall 12 and surrounds the lower part of the rocker arm 2 in a curved shape and connects to the wall 27.
  • columns 29 also serve for the outflow of air or gas from the chamber, which is formed from the cover 11 and the walls 26, 27, into the grinding chamber, the air or gas receiving a higher pressure than the mill pressure.
  • the introduction of air or gas takes place by the illustrated in Fig. 3 neck 3 0.
  • Gas is preferably withdrawn from the gas duct 6o below the blade ring 56. Due to the flow resistance of the blade ring 56 there is a pressure drop from the gas channel 6o into the grinding chamber 48. Therefore gas can from the gas port 6 0 without an additional blower through the port 3o in the chamber formed by the positions 11, 26, 27, are led 29 .
  • An auxiliary cylinder 37 is also provided for maintenance work and is removable. The latter engages articulated eyes 36 which are arranged in the hubs 17a, 17b.
  • the more detailed training is shown in Fig. 4, so that the further details of this training must be reserved for the discussion of Fig. 4.
  • FIG. 2 also shows the arrangement of the fork 4, which is slightly curved inwards and is connected at the end to the axis 8, which belongs to the hydropneumatic pressing device 7 with the piston 16, which ends in an axis 8 ' , which connects the hydraulic pressure device to the foundation 55 on which the gear 54 for driving the grinding bowl 10 is located.
  • the spring buffer consists of a stop pin 32 to which a spring 33 is fastened within a housing.
  • FIG. 3 shows a section through the rocker arm 2 and the rocker arm axis 3, to which the fork 4 is connected at the bottom.
  • the rocker arm 2 with the rocker arm axis 3 has a gas-tight capsule 11, the upper end of which can be connected or detached to the mill housing 12, so that the rocker arm 2 can be swung out. All parts designated 12 in the illustration still belong to the gas-tight mill housing.
  • the axis 3 of the rocker arm 2 is hollow. The further training in the area of the rocker arm is such that the ingress of dust or foreign bodies through sealing air is prevented. As can be seen in FIG.
  • an air connection piece 40 is attached to one end of the hollow shaft 3, from which the sealing air is introduced into the interior 42 and 43 of the rocker arm 2 via the bore 41. From here, the sealing air passes through bores 44, which are located on both sides of the hollow axis 3, into the annular gaps 45, which are formed by the sleeve 46 and the grinding roller 1.
  • the annular gap 45 should be relatively narrow. Through this annular gap, the sealing air enters the grinding chamber 48 at high speed and at a higher pressure than the grinding chamber pressure, in which the rollers 1 rotate. This measure prevents the aggressive grinding dust from migrating into the gap 45 and reaching the grinding roller 1.
  • the end of the grinding roller axis is secured by an end plate 49, as can be seen from the illustration in FIG. 3.
  • the number 29 denotes the relatively narrow gaps that form the connection to the gas-tight housing, namely 26 and 27.
  • FIG. 3 further shows bolt openings 19 in the fork 4, which are designed to be removable and the detachable connection between the rocker arm 2 and the fork 4 represent.
  • the arrangement of these bolt connections 19 also results from the illustration in FIG. 4, which shows the bolt connections seen from the side.
  • FIG. 4 shows the bolt connections seen from the side.
  • the hinge eye 5 with the axis 8 is indicated.
  • Fig. 4 shows the details of the mounting of the rocker arm axis 3, the arrangement of which also results from the illustration in Fig. 3.
  • the rocker arm axis 3 is supported on the stand 9, which is shown in section in Fig. 4.
  • the fork 4 engages due to its curved shape through the stand 9 in the area below the grinding bowl lo.
  • the cheeks 14 are, as can be seen in the illustration, so far apart that the cover 11 (see FIG. 3) with the two sealing air chambers 15a and 15b can be arranged between them.
  • the torque transmission ie the power transmission from the piston 16 (see FIG.
  • the rocker arm is sealed off from the outside atmosphere by encapsulating the covers 11 and 12.
  • the rocker arm passages are passed through these covers 11 and 12 provided with very narrow gaps.
  • the columns 24 are thus blown by introducing air or gas as a blocking agent into the connecting piece 25 of the sealing air chambers 1 5 a and 15 b because the supplied air or the gas has a higher pressure than the gas pressure in the mill.
  • the rocker arm axis 3 is supported at its ends by roller bearings 23. With 36 articulated eyes are designated, the function of which results from the illustration in FIG. Finally, the illustration in FIG. 4 also shows the axis 8 at the lower end, which was already described in FIG. 2 as a hydropneumatic pressing device in connection with the hydraulic cylinder 7.
  • the shortest distance (a) (see FIGS. 2 and 3) between the axis of the hydraulic cylinder 7 and the fulcrum of the rocker arm axis 3 is between 50 and 95% of that distance (b) (see FIG. 3 ), which is the center of the rocker arm axis 3 from the center of the grinding roller 1 according to the drawn line of the grinding bowl lo.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Mold Materials And Core Materials (AREA)
  • Table Devices Or Equipment (AREA)
  • Disintegrating Or Milling (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)

Abstract

A roll mill, more specially for coal, has a turning pan and a number of rolls running thereon for producing a milling effect. Each roll is supported on a rocker arm, able to be turned about a horizontal axis which is roughly tangential to the pan. The rocker arm and the roll on it are forced down against the pan by a hydraulic cylinder joined with a fork which, in turn, is joined with the rocker arm for turning it about the turnpin. The fork may be unjoined from the rocker arm for upkeep work on the roll. Each rocker arm has a gas-tight cover structure which is part of the casing of the mill.

Description

Die Erfindung betrifft eine Walzenmühle, insbesondere für die Kohlenvermahlung, mit einem gasdichten Mühlengehäuse, einem rotierenden Mahlteller und mehreren, auf dem Mahlteller abrollenden Mahlwalzen, von denen jede Mahlwalze mit einem Schwinghebel um eine Schwinghebelachse gelagert ist.The invention relates to a roller mill, in particular for coal grinding, with a gas-tight mill housing, a rotating grinding table and a plurality of grinding rolls rolling on the grinding table, of which each grinding roll is mounted with a rocker arm about a rocker arm axis.

Die Mühle wird von Luft oder Gas, meistens höherer Temperatur als die Umgebungstemperatur, durchströmt. Die Luft oder das Gas dienen der Mahlguttrocknung und werden als Staubtransportmittel genutzt. Das Gas tritt mit einem höheren als Atmosphärdruck, von einem separaten Gebläse erzeugt, in den Anschlußstutzen einer Gaskammer unterhalb des rotierenden Mahltellers mit Schaufelkranz ein, strömt durch den Schaufelkranz, der den Mahlteller umgibt in den Mahlraum, erfaßt dort gemahlenes Gut, trocknet es im Schwebegasverfahren und trägt das zerkleinerte Gut zum Sichter oberhalb des Mahlraumes.Air or gas, usually at a higher temperature than the ambient temperature, flows through the mill. The air or gas is used to dry the regrind and is used as a means of dust transport. The gas enters the connecting piece of a gas chamber below the rotating grinding plate with a blade ring at a higher than atmospheric pressure, generated by a separate blower, flows through the blade ring that surrounds the grinding plate into the grinding chamber, collects ground material there, dries it using the floating gas process and carries the shredded material to the sifter above the grinding chamber.

Wegen der zur Zeit betriebenen Umstellung vieler Elektrizitätswerke von Erdöl auf Kohle hat es sich als erforderlich erwiesen, den Bau von Kohlenmahlanlagen noch besser zu rationalisieren. Der Leitgedanke der Erfindung besteht darin, Walzenmühlen mit gasdichtem Gehäuse nach einem Baukastensystem zu entwickeln, was in der Weise geschehen soll, daß jede Mahlwalze mit den zum Ausschwenken erforderlichen Teilen als eine Einheit hergestellt wird und zwar derart, daß jede Walzenmühle mit einer variablen Anzahl von Walzen hergestellt werden kann, ohne daß wesentliche Änderungen der Mahlwalze mit den dazugehörigen Organen zum Ausschwenken aus gleichen Teilen erforderlich sind. Auf diese Weise wird es ermöglicht, die Mahlwalze mit den dazugehörigen Teilen zum Ausschwenken um eine Mahlschüssel herum zu gruppieren, wobei vorzugsweise jede Mahlwalzeneinheit auf einem Ständer angeordnet werden kann. Hierbei ergab sich die Aufgabe, den Schwinghebel in das Mühlengehäuse einzubeziehen und gasdicht abzuschließen, weil Walzenmühlen zur Vermahlung von Kohle in sogenannten Direkteinblasanlagen mit einem Heißluftstrom betrieben werden, der einen höheren als atmosphärischen Druck besitzt.Due to the current conversion of many power plants from petroleum to coal, it has proven necessary to rationalize the construction of coal grinding plants even better. The main idea of the invention is to develop roller mills with a gas-tight housing according to a modular system, which is to be done in such a way that each grinding roller with the parts required for pivoting out is manufactured as a unit, in such a way that each roller mill with a variable number of Rollers can be made without essential changes of the grinding roller with the associated organs for swinging out of the same parts are required. In this way it is possible to group the grinding roller with the associated parts for pivoting out around a grinding bowl, it being possible for each grinding roller unit to be preferably arranged on a stand. The task here was to include the rocker arm in the mill housing and to seal it gas-tight, because roller mills for grinding coal in so-called direct injection systems are operated with a hot air stream that has a higher than atmospheric pressure.

Die Erfindung besteht demgemäß darin, daß der Schwinghebel von einer Gabel, an deren Ende eine Kraft zum Anpressen und Abheben der Mahlwalze eingeleitet wird, geführt und abkoppelbar ist, der Schwinghebel gekapselt und in das gasdichte Mühlengehäuse einbezogen ist. Bei einer Ausführungsform der Erfindung sind der Schwinghebel der Mahlwalze und die Gabel während des Betriebes durch Bolzen formschlüssig zu einer Funktionseinheit miteinander verbunden, wobei für die Wartung der Mahlwalze und der dazugehörigen Teile die Bolzen zur Abkopplung des Schwinghebels von der Gabel herausnehmbar angeordnet sind, so daß lediglich der Schwinghebel an einer Schwenkbewegung der Mahlwalze nach außen teilnimmt. Erfindungsgemäß weist ferner der gasdichte Abschluß des Schwinghebels einen Deckel auf, der im oberen Teil an das gasdichte Gehäuse anschließbar ist und dessen unterer Teil den Schwinghebel in einer gekrümmten Form abschließt und bis zu einem die Walzenachse umgebenden Kragen reicht. Zur Sicherung des gasdichten Abschlusses ist auf jeder Seite des Deckels je eine um die Schwinghebelachse herumgeführte Sperrluftkammer angeordnet, um einen gasdichten Abschluß gegen die Schwinghebelachse zu erhalten. Um geringe resultierende Lagerkräfte an der Schwinghebelachse zu erreichen, ist es zweckmäßig, wenn das Verhältnis der Stangenkraft des Iiydrau- likzylinders und der Walzenkraft zwischen 50 % und 150 % beträgt. Um eine gasdichte Abschließung mit Sicherheit zu erreichen, ist. der Schwinghebel hohl ausgeführt und wird mit Sperrluft durchströmt, die an einer beliebigen Stelle außerhalb des Mahlraums, vorzugsweise an einer Achsstirnseite, in den Hebel eingeleitet wird, von wo sie zu einem Ringspalt zwischen Walze und Hülse des Schwinghebels geführt wird und von hier aus mit hohem Druck und hoher Geschwindigkeit in den Mahlraum eintritt.The invention accordingly consists in that the rocker arm is guided and uncoupled from a fork, at the end of which a force for pressing and lifting the grinding roller is introduced, and the rocker arm is encapsulated and incorporated into the gas-tight mill housing. In one embodiment of the invention, the rocking lever of the grinding roller and the fork are positively connected to one another during operation by bolts to form a functional unit, the bolts for decoupling the rocking lever from the fork being removably arranged for the maintenance of the grinding roller and the associated parts, so that only the rocker arm takes part in a pivoting movement of the grinding roller to the outside. According to the invention, the gas-tight closure of the rocker arm also has a cover which can be connected in the upper part to the gas-tight housing and whose lower part closes the rocker arm in a curved shape and extends as far as a collar surrounding the roller axis. To secure the gas-tight seal, a sealing air chamber which is guided around the rocker arm axis is arranged on each side of the cover in order to obtain a gas-tight seal against the rocker arm axis. In order to achieve low resulting bearing forces on the rocker arm axis, it is advantageous if the ratio of the rod force of I i ydrau- likzylinders and the roll separating force is between 50% and 150% by weight. To ensure a gas-tight seal is enough. the rocker arm is hollow and is traversed with sealing air which is introduced into the lever at any point outside the grinding chamber, preferably on one end face, from where it is guided to an annular gap between the roller and sleeve of the rocker arm and from here with a high Pressure and high speed enters the grinding chamber.

Zwecks Weiterentwicklung an die bekannte Ausführungsform einer Walzenmühle ist jeweils ein Mahlwalzenaggregat für sich auf einem tragfähigen Lagerbock angeordnet.For the further development of the known embodiment of a roller mill, a grinding roller unit is arranged on a load-bearing bracket.

'Der technische Fortschritt der Erfindung besteht darin, daß infolge der Ausbildung eines Mahlwalzenaggregats eine Grundform einer Walzenmühle wahlweise mit zwei oder mehreren Mahlwalzen ausgerüstet werden kann, wobei eine grundsätzliche Abänderung des Mahlwalzenaggregats für zwei oder mehr Mahlwalzen. nicht erforderlich ist. Dieser Vorteil ist verbunden mit einer absoluten Gasdichtigkeit der Walzenmühle und Einrichtungen, um für Wartungszwecke alle oder eine Mahlwalze ausschwenken zu können.'The technical progress of the invention is that due to the formation of a grinding roller unit, a basic form of a roller mill can optionally be equipped with two or more grinding rollers, with a fundamental modification of the grinding roller unit for two or more grinding rollers. is not required. This advantage is connected with an absolute gas tightness of the roller mill and devices in order to be able to swing out all or one grinding roller for maintenance purposes.

In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt.

  • Fig. 1 zeigt in schematischer Darstellung eine Walzenmühle mit Bezeichnung der wichtigsten Teile einer Walzenmühle, jedoch ohne Darstellung der zur Erfindung gehörenden Teile;
  • Fig. 2 zeigt in der Seitenansicht eine Mahlwalze mit Schwinghebel, einer Gabel, einen Mahlteller und den Hydraulikzylinder zur Steuerung der Gabel;
  • Fig. 3 zeigt insbesondere die Mahlwalze mit dem Schwinghebel und der Schwinghebelachse sowie weitere für die Erfindung wesentlichen Teile;
  • Fig. 4 zeigt in schematischer Darstellung die Lagerung der Schwinghebelachse mit den Teilen zum Einführen der Sperrluft.
In the drawing, an embodiment of the invention is shown.
  • Fig. 1 shows a schematic representation of a roller mill with the name of the most important parts of a roller mill, but without showing the parts belonging to the invention;
  • Fig. 2 shows in side view a grinding roller with rocker arm, a fork, a grinding plate and the hydraulic cylinder for controlling the fork;
  • Fig. 3 shows in particular the grinding roller with the rocker arm and the rocker arm axis and other parts essential to the invention;
  • Fig. 4 shows a schematic representation of the storage of Rocker arm axis with the parts for introducing the sealing air.

Fig. 1 zeigt in schematischer Darstellung eine in bekannter Weise ausgebildete Walzenmühle mit zwei Mahlwalzen 1, mit den Ständern 9, von denen mehrere um die Mahlsbhüssel 10 angeordnet sind. Im Bereich der Mahlwalzen 1 befindet sich das gasdichte Mühlengehäuse 12 und den abnehmbaren Deckel 11 für das Herausschwenken der Mahlwalzen 1. Auf der linken Seite ist die Mahlwalze 1' in herausgeschwenkter Stellung gestrichelt dargestellt. Über dem gasdichten Gehäuse 12 ist das Sichtergehäuse 50 mit dem Sichter 51 angeordnet. Mit der Ziffer 52 ist der Austritt für den Heißluftstrom gekennzeichnet. Der Pfeil 53 bezeichnet den Weg des Aufgabegutes, nämlich der in die Mühle aufgegebenen Rohkohle. Der Heißluftstrom wird dem Mahlraum durch den Schaufelkranz 56 zugeführt, der bei diesem Ausführungsbeispiel am Mühlengehäuse 12 befestigt ist. Jedoch. sind auch Ausführungsformen möglich, bei denen der Schaufelkranz am Mahlteller 10 befestigt ist.Fig. 1 shows a schematic representation of a roller mill designed in a known manner with two grinding rollers 1, with the stands 9, of which several are arranged around the grinding bowl 10. In the area of the grinding rollers 1 there is the gas-tight mill housing 12 and the removable cover 11 for the pivoting out of the grinding rollers 1. On the left side, the grinding roller 1 'is shown in dashed lines in the pivoted-out position. The classifier housing 50 with the classifier 51 is arranged above the gas-tight housing 12. The outlet 52 for the hot air flow is identified by the number 52. The arrow 53 indicates the path of the feed material, namely the raw coal fed into the mill. The hot air flow is fed to the grinding chamber through the blade ring 56, which is fastened to the mill housing 12 in this exemplary embodiment. However. Embodiments are also possible in which the blade ring is attached to the grinding table 10.

In der Darstellung befindet sich zwischen den Ständern 9 das Getriebe 54, das auf dem Fundament 55 ruht.In the illustration, the gear 54, which rests on the foundation 55, is located between the uprights 9.

Fig. 2 zeigt bereits wesentliche Teile der Erfindung, die jedoch in Fig. 3 noch genauer dargestellt sind. Die Zeichnung zeigt in der Seitenansicht die Mahlwalze 1 auf der Mahlschüssel 10, die in ausgeschwenkter Stellung mit 1' bezeichnet ist. Der Schwinghebel 2 trägt die Achse der Mahlwalze 1, die im Schnitt in Fig. 3 dargestellt ist. Der Schwinghebel 2 befindet sich innerhalb einer gasdichten Abdeckung 11, die an der Gehäusewand 12 abnehmbar befestigt ist und den unteren Teil des Schwinghebels 2 in gekrümmter Form umgibt und an die Wand 27 anschließt.FIG. 2 already shows essential parts of the invention, but these are shown in more detail in FIG. 3. The drawing shows a side view of the grinding roller 1 on the grinding bowl 10, which is designated 1 'in the pivoted-out position. The rocker arm 2 carries the axis of the grinding roller 1, which is shown in section in Fig. 3. The rocker arm 2 is located within a gas-tight cover 11, which is removably attached to the housing wall 12 and surrounds the lower part of the rocker arm 2 in a curved shape and connects to the wall 27.

Die Darstellung zeigt ferner in Spalte 29 die den Durchtritt des Schwinghebels 2 durch die Wände 26,27 möglich machen. Die Spalten 29 dienen aber außerdem zum Abströmen von Luft oder Gas aus der Kammer, die aus dem Deckel 11 und den Wänden 26, 27 gebildet ist, in den Mahlraum, wobei die Luft oder das Gas einen höheren Druck erhält als der Mühlendruck. Das Einführen der Luft oder des Gases erfolgt durch den in Fig. 3 dargestellten Stutzen 30.The illustration also shows in column 29 which enable the rocker arm 2 to pass through the walls 26, 27. The However, columns 29 also serve for the outflow of air or gas from the chamber, which is formed from the cover 11 and the walls 26, 27, into the grinding chamber, the air or gas receiving a higher pressure than the mill pressure. The introduction of air or gas takes place by the illustrated in Fig. 3 neck 3 0.

Vorzugsweise wird Gas aus dem Gaskanal 6o unterhalb des Schaufelkranzes 56 entnommen. Bedingt durch den Strömungswiderstand des Schaufelkranzes 56 herrscht ein Druckgefälle vom Gaskanal 6o in den Mahlraum 48. Deshalb kann Gas aus dem Gaskanal 60 ohne ein Zusatzgebläse durch den Stutzen 3o in die Kammer, gebildet aus den Positionen 11, 26, 27, 29 geführt werden.Gas is preferably withdrawn from the gas duct 6o below the blade ring 56. Due to the flow resistance of the blade ring 56 there is a pressure drop from the gas channel 6o into the grinding chamber 48. Therefore gas can from the gas port 6 0 without an additional blower through the port 3o in the chamber formed by the positions 11, 26, 27, are led 29 .

Für Wartungsarbeiten ist ferner ein Hilfszylinder 37 vorgesehen, der entfernbar ist. Dieser greift an Gelenkaugen 36 an, die in den Naben 17a, 17b angeordnet sind. Die nähere Ausbildung ist in Fig. 4 dargestellt, so daß die weiteren Angaben zu dieser Ausbildung der Besprechung von Fig. 4 vorbehalten bleiben müssen.An auxiliary cylinder 37 is also provided for maintenance work and is removable. The latter engages articulated eyes 36 which are arranged in the hubs 17a, 17b. The more detailed training is shown in Fig. 4, so that the further details of this training must be reserved for the discussion of Fig. 4.

Die Darstellung in Fig. 2 läßt ferner die Anordnung der Gabel 4 erkennen, die leicht nach innen gekrümmt ist und am Ende mit der Achse 8 verbunden ist, die zu der hydropneumatischen Anpreßeinrichtung 7 mit den Kolben 16 gehört, der in einer Achse 8' endet, die die hydraulische Anpreßeinrichtung mit dem Fundament 55 verbindet, auf dem sich das Getriebe 54 für den Antrieb der Mahlschüssel lo befindet.The illustration in Fig. 2 also shows the arrangement of the fork 4, which is slightly curved inwards and is connected at the end to the axis 8, which belongs to the hydropneumatic pressing device 7 with the piston 16, which ends in an axis 8 ' , which connects the hydraulic pressure device to the foundation 55 on which the gear 54 for driving the grinding bowl 10 is located.

Fig. 2 und 3 zeigen schließlich eine Anordnung, die eine Anschlagplatte 31 enthält, die gegen einen Anschlagbolzen 32 eines Federpuffers 33 arbeitet. Der Federpuffer besteht aus einem Anschlagbolzen 32, an dem eine Feder 33 innerhalb eines Gehäuses befestigt ist. Durch Einstellen des Anschlagbolzens 32 über eine Schlüsselfläche 34 und eine Gewindeführung im Ständer 9 kann die Gabel 4 in sehr geringem Bereich aus ihrer Ruhelage hin- und herbewegt werden, wodurch eine Einstellung erreicht werden kann, bei der die Mahlwalzen 1 nicht die Mahlschüssel lo metallisch berühren.2 and 3 finally show an arrangement which contains a stop plate 31 which works against a stop bolt 32 of a spring buffer 33. The spring buffer consists of a stop pin 32 to which a spring 33 is fastened within a housing. By adjusting the stop bolt 32 via a key surface 34 and a thread guide in Stand 9, the fork 4 can be moved back and forth in a very small area, whereby a setting can be achieved in which the grinding rollers 1 do not touch the grinding bowl lo metallic.

Die Darstellung in Fig. 3 zeigt einen Schnitt durch den Schwinghebel 2 und die Schwinghebelachse 3, an die sich unten die Gabel 4 anschließt. Der Schwinghebel 2 mit der Schwinghebelachse 3 weist eine gasdichte Kapsel 11 auf, deren oberes Ende an das Mühlengehäuse 12 anschließbar bzw. lösbar ist, so daß der Schwinghebel 2 ausschwenkbar ist. Alle in der Darstellung mit 12 bezeichneten Teile gehören noch zum gasdichten Mühlengehäuse. Die Achse 3 des Schwinghebels 2 ist hohl ausgebildet. Die weitere Ausbildung in dem Bereich des Schwinghebels ist derart, daß das Eindringen von Staub oder Fremdkörper durch Sperrluft verhindert wird. Wie die Fig. 4 erkennen läßt, ist an einem Ende der Hohlachse 3 ein Luftanschlußstutzen 4o angebracht, von dem aus die Sperrluft über die Bohrung 41 in die Innenräume 42 und 43 des Schwinghebels 2 eingeführt wird. Von hier aus gelangt die Sperrluft über Bohrungen 44, die sich auf beiden Seiten der Hohlachse 3 befinden in die Ringspalte 45, die von der Hülse 46 und der Mahlwalze 1 gebildet werden. Die Ringspalte 45 soll verhältnismäßig eng ausgebildet sein. Durch diese Ringspalte tritt die Sperrluft mit hoher Geschwindigkeit und einem höheren Druck als dem Mahlraumdruck in den Mahlraum 48 ein, in dem die Walzen 1 umlaufen. Durch diese Maßnahme wird verhindert, daß der aggressive Mahlstaub in den Spalt 45 hineinwandert und zur Lagerung der Mahlwalze 1 gelangt. Das Ende der Mahlwalzenachse ist durch eine Endplatte 49 gesichert, wie sie aus der Darstellung in Fig. 3 ersichtlich ist. Mit der Ziffer 29 sind die verhältnismäßig engen Spalten bezeichnet, die den Anschluß an das gasdichte Gehäuse nämlich 26 und 27 bilden.The illustration in FIG. 3 shows a section through the rocker arm 2 and the rocker arm axis 3, to which the fork 4 is connected at the bottom. The rocker arm 2 with the rocker arm axis 3 has a gas-tight capsule 11, the upper end of which can be connected or detached to the mill housing 12, so that the rocker arm 2 can be swung out. All parts designated 12 in the illustration still belong to the gas-tight mill housing. The axis 3 of the rocker arm 2 is hollow. The further training in the area of the rocker arm is such that the ingress of dust or foreign bodies through sealing air is prevented. As can be seen in FIG. 4, an air connection piece 40 is attached to one end of the hollow shaft 3, from which the sealing air is introduced into the interior 42 and 43 of the rocker arm 2 via the bore 41. From here, the sealing air passes through bores 44, which are located on both sides of the hollow axis 3, into the annular gaps 45, which are formed by the sleeve 46 and the grinding roller 1. The annular gap 45 should be relatively narrow. Through this annular gap, the sealing air enters the grinding chamber 48 at high speed and at a higher pressure than the grinding chamber pressure, in which the rollers 1 rotate. This measure prevents the aggressive grinding dust from migrating into the gap 45 and reaching the grinding roller 1. The end of the grinding roller axis is secured by an end plate 49, as can be seen from the illustration in FIG. 3. The number 29 denotes the relatively narrow gaps that form the connection to the gas-tight housing, namely 26 and 27.

Die Darstellung in Fig. 3 zeigt ferner Bolzenöffnungen 19 in der Gabel 4, die herausnehmbar ausgebildet sind und die lösbare Verbindung zwischen dem Schwinghebel 2 und der Gabel 4 darstellen. Die Anordnung dieser Bolzenverbindungen 19 ergibt sich auch aus der Darstellung in Fig. 4, die die Bolzenverbindungen von der Seite gesehen zeigt. Am unteren Ende der Darstellung in Fig. 4 ist das Gelenkauge 5 mit der Achse 8 angedeutet.The illustration in FIG. 3 further shows bolt openings 19 in the fork 4, which are designed to be removable and the detachable connection between the rocker arm 2 and the fork 4 represent. The arrangement of these bolt connections 19 also results from the illustration in FIG. 4, which shows the bolt connections seen from the side. At the lower end of the illustration in Fig. 4, the hinge eye 5 with the axis 8 is indicated.

Fig. 4 zeigt die Einzelheiten zur Lagerung der Schwinghebelachse 3, deren Anordnung sich darüber hinaus aus der Darstellung in Fig. 3 ergibt. Die Schwinghebelachse 3 stützt sich auf dem Ständer 9 ab, der in Fig. 4 im Schnitt dargestellt ist. Wie aus der Darstellung in Fig. 3 ersichtlich ist, greift die Gabel 4 infolge ihrer gekrümmten Form durch den Ständer 9 in den Bereich unterhalb der Mahlschüssel lo. Die Wangen 14 sind wie die Darstellung erkennen läßt, so weit auseinandergerückt, daß zwischen ihnen der Deckel 11 (s. Fig. 3) mit den beiden Sperrluftkammern 15a und 15b angeordnet werden kann. Die Drehmomentübertragung, d. h. die Kraftübertragung vom Kolben 16 (s. Fig. 2) über den Stangenkopf 5 und die Gabel 4 auf die Schwinghebelachse 3, den Schwinghebel 2 und die Walze 1 erfolgt durch zwei Naben 17a und 17b, die im Schnitt in Fig. 4 dargestellt sind. Diese Naben 17a und 17b sind kerbspannungsfrei über ein an sich bekanntes Schrumpfscheibensystem 18 auf den Enden der Schwinghebelachse 3 aufgeklemmt. Zur Sicherung der Gabel 4 sind zwei Blechlaschen 21 vorgesehen, mit denen die Gabel am unteren Ende über die Schrauben 22 verbunden ist. Diese Blechlaschen 21 hängen also die Gabel 4 auf den beiden Achsenden der Schwinghebelachse 3 auf. Beim Ausschwenken der Mahlwalze 1 findet also nur eine Gleitbewegung der Laschen 21 auf der Schwinghebelachse 3 statt. Die Abdichtung des Schwinghebels gegenüber der Außenatmosphäre erfolgt zunächst, wie bereits geschildert wurde, durch die Abkapslung der Deckel 11 und 12. Um das Austreten von Gasen und Staub aus der Mühle, die Kohlepartikelchen enthalten, zu vermeiden, werden die Schwinghebeldurchtritte durch diese Deckel 11 und 12 mit sehr engen Spalten versehen. Die Spalten 24 werden also durch Einführen von Luft oder Gas als Sperrmittel in die Anschlußstutzen 25 der Sperrluftkammern 15a und 15b freigeblasen, weil die zugeführte Luft oder das Gas einen höheren Druck als der Gasdruck in der Mühle hat.Fig. 4 shows the details of the mounting of the rocker arm axis 3, the arrangement of which also results from the illustration in Fig. 3. The rocker arm axis 3 is supported on the stand 9, which is shown in section in Fig. 4. As can be seen from the illustration in Fig. 3, the fork 4 engages due to its curved shape through the stand 9 in the area below the grinding bowl lo. The cheeks 14 are, as can be seen in the illustration, so far apart that the cover 11 (see FIG. 3) with the two sealing air chambers 15a and 15b can be arranged between them. The torque transmission, ie the power transmission from the piston 16 (see FIG. 2) via the rod head 5 and the fork 4 to the rocker arm axis 3, the rocker arm 2 and the roller 1 takes place through two hubs 17a and 17b, which are shown in section in FIG. 4 are shown. These hubs 17a and 17b are clamped on the ends of the rocker arm axis 3 by means of a shrink disk system 18 which is known per se and is free of notch stress. To secure the fork 4, two sheet metal tabs 21 are provided, with which the fork is connected at the lower end via the screws 22. These metal tabs 21 thus hang the fork 4 on the two ends of the rocker arm axis 3. When the grinding roller 1 is pivoted out, there is therefore only a sliding movement of the tabs 21 on the rocker arm axis 3. As previously described, the rocker arm is sealed off from the outside atmosphere by encapsulating the covers 11 and 12. In order to prevent gases and dust from the mill which contain carbon particles from escaping, the rocker arm passages are passed through these covers 11 and 12 provided with very narrow gaps. The columns 24 are thus blown by introducing air or gas as a blocking agent into the connecting piece 25 of the sealing air chambers 1 5 a and 15 b because the supplied air or the gas has a higher pressure than the gas pressure in the mill.

Die Schwinghebelachse 3 wird an ihren Enden durch Wälzlager 23 getragen. Mit 36 sind Gelenkaugen bezeichnet, deren Funktion sich aus der Darstellung in Fig. 2 ergibt. Schließlich zeigt die Darstellung in Fig. 4 noch am unteren Ende die Achse 8, die bereits in Fig. 2 als hydropneumatische Anpreßeinrichtung in Verbindung mit dem Hydraulikzylinder 7 beschrieben wurde.The rocker arm axis 3 is supported at its ends by roller bearings 23. With 36 articulated eyes are designated, the function of which results from the illustration in FIG. Finally, the illustration in FIG. 4 also shows the axis 8 at the lower end, which was already described in FIG. 2 as a hydropneumatic pressing device in connection with the hydraulic cylinder 7.

Bei einer Ausführungsform der Erfindung liegt der kürzeste Abstand (a) (siehe Fig. 2 und 3) zwischen der Achse des Hydraulikzylinders 7 und dem Drehpunkt der Schwinghebelachse 3 und beträgt zwischen 50 und 95 % desjenigen Abstandes (b) (siehe Fig. 3), den das Zentrum der Schwinghebelachse 3 von der Mitte der Mahlwalze 1 gemäß der eingezeichneten Linie der Mahlschüssel lo beträgt.In one embodiment of the invention, the shortest distance (a) (see FIGS. 2 and 3) between the axis of the hydraulic cylinder 7 and the fulcrum of the rocker arm axis 3 is between 50 and 95% of that distance (b) (see FIG. 3 ), which is the center of the rocker arm axis 3 from the center of the grinding roller 1 according to the drawn line of the grinding bowl lo.

Claims (7)

1. Walzenmühle, insbesondere für die Kohlenvermahlung mit einem gasdichten Mühlengehäuse, einem rotierenden Mahlteller und mehreren, auf dem Mahlteller abrollenden Mahlwalzen, von denen jede Mahlwalze mit einem Schwinghebel um eine Schwinghebelachse schwenkbar gelagert ist, dadurch gekennzeichnet, daß der Schwinghebel (2) von einer Gabel (4), an deren Ende eine Kraft eingeleitet wird, abkoppelbar ist, der Schwinghebel für sich gasdicht gekapselt ist und in das gasdichte Mühlengehäuse (12) einbezogen ist.1. Roll mill, in particular for coal grinding with a gas-tight mill housing, a rotating grinding table and several grinding rolls rolling on the grinding table, of which each grinding roll is pivotally mounted with a rocker arm about a rocker arm axis, characterized in that the rocker arm (2) of one Fork (4), at the end of which a force is introduced, can be uncoupled, the rocker arm is encapsulated in a gas-tight manner and is incorporated in the gas-tight mill housing (12). 2. Walzenmühle nach Anspruch 1, dadurch gekennzeichnet, daß der Schwinghebel (2) und die Gabel (4) während des Betriebs durch Bolzen (19) formschlüssig zu einer Funktionseinheit miteinander verbunden sind und für Wartungszwecke die Bolzen (19) zur Abkopplung des Schwinghebels (2) von der Gabel (4) herausnehmbar angeordnet sind, so daß lediglich der Schwinghebel (2) an einer Schwenkbewegung der Walze (1) nach äußren teilnimmt.2. Roller mill according to claim 1, characterized in that the rocker arm (2) and the fork (4) are positively connected to one another to form a functional unit during operation by bolts (19) and for maintenance purposes the bolts (19) for decoupling the rocker arm ( 2) are removably arranged from the fork (4), so that only the rocker arm (2) takes part in a pivoting movement of the roller (1) towards the outside. 3. Walzenmühle nach Anspruch 1, dadurch gekennzeichnet, daß der gasdichte Abschluß (11) des Schwinghebels (2) einen Deckel (11) aufweist, der im oberen Teil an das gasdichte Gehäuse (12) anschließbar ist und dessen unterer Teil den Schwinghebel (2) in einer gekrümmten Form abschließt und bis zu einem die Walzenachse umgebenden Kragen reicht.3. Roller mill according to claim 1, characterized in that the gas-tight seal (11) of the rocker arm (2) has a cover (11) which can be connected in the upper part to the gas-tight housing (12) and the lower part of which is the rocker arm (2 ) ends in a curved shape and extends to a collar surrounding the roller axis. 4. Walzenmühle nach Anspruch 1, dadurch gekennzeichnet, daß die Kammer, gebildet aus den Teilen Pos. (11), (26), (27), (29), über den Stutzen (30) mit Gas aus dem Gaskanal (60) bespülbar ist, wobei unter Ausnutzung des Druckgefälles zwischen dem Gaskanal (60) und dem Mühlengehäuse (48) über den Widerstand des Schaufelkranzes (56) eine selbsttätige Strömung ohne Zusatzgebläse zustandekommt.4. Roller mill according to claim 1, characterized in that the chamber, formed from the parts pos. (11), (26), (27), (29), via the nozzle (3 0 ) with gas from the gas channel (6 0 ) can be flushed, using the pressure gradient between the gas duct (6 0 ) and the mill housing (48) via the resistance of the blade ring (56) to produce an automatic flow without an additional fan. 5. Walzenmühle nach Anspruch 1, dadurch gekennzeichnet, daß auf jeder Seite des Deckels (11) je eine um die Schwinghebelachse (3) herum geführte Sperrluftkammer (15a, 15b) angeordnet ist, um einen gasdichten Abschluß gegen die Schwinghebelachse (3) zu erhalten.5. Roller mill according to claim 1, characterized in that on each side of the cover (11) one around the rocker arm axis (3) guided sealing air chamber (15a, 15b) is arranged in order to obtain a gas-tight seal against the rocker arm axis (3) . 6. Walzenmühle nach Anspruch 1, dadurch gekennzeichnet, daß das Verhältnis der Stangenkraft des Hydraulikzylinders (7) und der Walzenkraft zwischen 5o % und 150 % beträgt.6. Roller mill according to claim 1, characterized in that the ratio of the rod force of the hydraulic cylinder (7) and the roller force is between 5o% and 150%. 7. Walzenmühle nach Anspruch 1, dadurch gekennzeichnet, daß der Schwinghebel (2) hohl ausgeführt ist und mit Sperrluft durchströmt wird, die an einer beliebigen Stelle außerhalb des Mahlraums, vorzugsweise an einer Achsstirnseite (4o), in den Hebel eingeleitet wird, von wo sie zu einem Ringspalt zwischen Walze (1) und Hülse (46) des Schwinghebels (2) geführt wird und von hier aus mit hohem Druck und hoher Geschwindigkeit in den Mahlraum (48) eintritt.7. Roller mill according to claim 1, characterized in that the rocker arm (2) is hollow and is flowed through with sealing air, which is introduced at any point outside the grinding chamber, preferably at one end face (4o), into the lever from where it is guided to an annular gap between roller (1) and sleeve (46) of the rocker arm (2) and from here enters the grinding chamber (48) at high pressure and high speed.
EP82100023A 1981-01-08 1982-01-05 Roller mill, especially for the milling of coal Expired EP0056236B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82100023T ATE19861T1 (en) 1981-01-08 1982-01-05 ROLLER MILL, ESPECIALLY FOR CARBON GRINDING.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3100341 1981-01-08
DE19813100341 DE3100341A1 (en) 1981-01-08 1981-01-08 ROLL MILL, ESPECIALLY FOR COAL GRINDING

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EP0056236A2 true EP0056236A2 (en) 1982-07-21
EP0056236A3 EP0056236A3 (en) 1984-05-02
EP0056236B1 EP0056236B1 (en) 1986-05-21

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US (1) US4432500A (en)
EP (1) EP0056236B1 (en)
JP (1) JPS57135051A (en)
AT (1) ATE19861T1 (en)
DE (2) DE3100341A1 (en)
DK (1) DK161946C (en)
ZA (1) ZA819034B (en)

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Also Published As

Publication number Publication date
DE3271222D1 (en) 1986-06-26
JPS6411339B2 (en) 1989-02-23
DK5682A (en) 1982-07-09
EP0056236A3 (en) 1984-05-02
ATE19861T1 (en) 1986-06-15
JPS57135051A (en) 1982-08-20
EP0056236B1 (en) 1986-05-21
DE3100341A1 (en) 1982-07-22
DK161946C (en) 1992-02-03
US4432500A (en) 1984-02-21
ZA819034B (en) 1982-11-24
DK161946B (en) 1991-09-02

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