EP0518293B1 - Frame for a milling device for slits with pressure compensation for the bearing closures - Google Patents

Frame for a milling device for slits with pressure compensation for the bearing closures Download PDF

Info

Publication number
EP0518293B1
EP0518293B1 EP92109755A EP92109755A EP0518293B1 EP 0518293 B1 EP0518293 B1 EP 0518293B1 EP 92109755 A EP92109755 A EP 92109755A EP 92109755 A EP92109755 A EP 92109755A EP 0518293 B1 EP0518293 B1 EP 0518293B1
Authority
EP
European Patent Office
Prior art keywords
piston
oil reservoir
pressure
bearing seals
compression spring
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.)
Expired - Lifetime
Application number
EP92109755A
Other languages
German (de)
French (fr)
Other versions
EP0518293A1 (en
Inventor
Maximilian Arzberger
Ignaz Seitle
Leonhard Weixler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bauer Spezialtiefbau GmbH
Original Assignee
Bauer Spezialtiefbau GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bauer Spezialtiefbau GmbH filed Critical Bauer Spezialtiefbau GmbH
Publication of EP0518293A1 publication Critical patent/EP0518293A1/en
Application granted granted Critical
Publication of EP0518293B1 publication Critical patent/EP0518293B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00—Excavations; Bordering of excavations; Making embankments
    • E02D17/13—Foundation slots or slits; Implements for making these slots or slits
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/18—Dredgers; Soil-shifting machines mechanically-driven with digging wheels turning round an axis, e.g. bucket-type wheels
    • E02F3/20—Dredgers; Soil-shifting machines mechanically-driven with digging wheels turning round an axis, e.g. bucket-type wheels with tools that only loosen the material, i.e. mill-type wheels
    • E02F3/205—Dredgers; Soil-shifting machines mechanically-driven with digging wheels turning round an axis, e.g. bucket-type wheels with tools that only loosen the material, i.e. mill-type wheels with a pair of digging wheels, e.g. slotting machines

Definitions

  • the invention relates to a milling frame for a trench cutter with oil-lubricated bearing seals for the cutting wheels and with a regulated hydraulic pressure compensation device for the bearing seals.
  • slots are made in civil engineering that can be up to 100 m deep.
  • the slot is filled with a support liquid made of a bentonite and water mixture until the slot wall is produced.
  • the fluid pressure rises, so that the bearing seals for the cutting wheels must be provided with a pressure compensation device in order to prevent the penetration of supporting fluid or leakage and oil loss.
  • pressure compensation devices rapid changes in the depth of the milling frame or rapid changes in pressure had proven problematic to track the internal pressure of the bearing seals accordingly quickly.
  • Such a pressure compensation device is known from DE-A-2162314.
  • the invention has for its object to provide a milling frame with a pressure compensation device of the type mentioned, with which a reliable pressure compensation is carried out even with rapid pressure changes.
  • This object is achieved in that there is a pressure-resistant oil reservoir connected to the seals via lines, and in addition that an air-filled, the buffer space, which is exposed to the external pressure and is arranged vertically below the oil reservoir, that the oil reservoir and the buffer space are connected to one another via a longitudinally displaceable piston, and that the piston is biased with a compression spring in the direction of the oil reservoir.
  • the invention has the advantage that, due to the spring preload, on the one hand a fixed, predetermined, constant overpressure is generated in the oil reservoir and thus in the bearing seals. Leakage losses can also be compensated for in this way. It prevents the penetration of support fluid even with rapidly increasing external pressure, even if the piston is only delayed or deflected too slowly, for example due to a static friction effect.
  • the air compressed in the buffer space acts as a separating medium between the supporting liquid and the movable parts of the pressure compensation device, so that this critical and sensitive area is protected against contamination.
  • the compression spring is designed as a helical spring which sits on the piston and which is supported on the one hand on a flange on a piston housing and on the other hand on a shoulder on the piston.
  • a particularly smooth guidance is achieved in that the piston is provided with a bush on its side facing the oil reservoir and in that the compression spring lies between the piston and the bush.
  • the bush is provided at its free end with a bottom on which the associated end face of the piston bears from the inside.
  • a rapid readjustment is also supported in that the piston is hollow to reduce its own weight or to improve buoyancy.
  • the trench wall cutter shown here comprises a rail-guided carriage 10 with a boom 11, on which a milling frame 12 is suspended via a supporting cable 14.
  • a milling frame 12 On the milling frame 12 there are two pairs of milling wheels 13 which are driven by hydraulic motors.
  • a slot filled with a support liquid made of a water / bentonite mixture is denoted by 15.
  • a pressure compensation device 16 is screwed to the milling frame 12 and is connected in line with oil-lubricated bearing seals (not shown) of the milling wheels 13.
  • the pressure compensation device 16 serves to readjust the oil pressure in the bearing seals as a function of the external pressure in the supporting fluid in such a way that neither oil emerges from the bearings nor does the supporting fluid enter the bearings.
  • FIG. 2 comprises a pressure-resistant oil reservoir 17, an air-filled buffer space 18 and a vertically longitudinally displaceable pressure piston 19.
  • the piston 19 and the oil reservoir 17 are located in a cylindrical housing 20 which is attached to the milling frame 12 (FIG. 1) is screwed.
  • a bell 22 surrounding the buffer space 18, which is welded to the housing 20, is secured with a screw 23 on the milling frame.
  • the oil reservoir 17 is provided with a first opening (24) for connection to a hose line, which leads to a pressure measuring device (not shown).
  • the oil reservoir can be filled or refilled via a second closable opening 25.
  • a third opening 26 is used to connect a hose connection to the bearing seals (not shown).
  • the oil reservoir 17 integrated in the housing 20 is limited on the one hand by an extension 27 of a cylinder jacket receiving the piston 19 and on the other hand by a pot 28 of the same length flanged on the end face. At the junction of pot 28 and extension 27, the end of a roller membrane 29 is clamped, which seals the oil reservoir 17 against the piston 19 and the piston guide.
  • the vertically displaceable piston 19 which is designed as a hollow body, acts on one end face over a large area of the oil reservoir 17 in such a way that a piston displacement produces a pressure change.
  • a piston displacement is triggered in that when the milling frame is lowered or raised, the supporting liquid exerts a corresponding pressure on the free end of the piston 19 in the region of the buffer space 18.
  • the piston 19 is biased against the oil reservoir 17 by a compression spring 30 designed here as a helical spring. It follows that the internal pressure in the oil reservoir 17 consists of the sum of the external pressure in the slot 15 (FIG. 1) and the spring preload. The spring force can be kept constant over a predetermined distance by appropriate selection of the spring length or the spring travel.
  • the compression spring 30, which surrounds the piston 19, is supported on an annular flange 31 on the free end face of the housing 20.
  • an annular shoulder 32 for supporting the compression spring 30 is formed on the piston 19.
  • a bushing 33 is placed on the piston 19, which overlaps the compression spring 30 on the outside, so that it comes to rest between the bushing 33 and the piston 19.
  • the piston 19 itself and the compression spring 30 are out of contact with the housing wall.
  • a suitable piston guide can be achieved by appropriate selection of the bushing material.
  • the bushing 33 is also provided with a base 34 on which the end face of the piston 19 is supported on the one hand and the roller membrane 29 comes to rest on the other hand.

Abstract

A cutting frame for a trench cutter with oil-lubricated bearing seals for the cutter wheels and with a controlled hydraulic pressure-compensation device for the bearing seals is described. There is a pressure-resistant oil reservoir connected to the bearing seals via lines and there is an air-filled buffer space open at the bottom, exposed to the outside pressure and arranged vertically below the oil reservoir. The oil reservoir and the buffer space are connected to one another via a longitudinally displaceable piston, and the piston is preloaded by a compression spring in the direction of the oil reservoir. <IMAGE>

Description

Die Erfindung betrifft einen Fräsrahmen für eine Schlitzwandfräse mit ölgeschmierten Lagerdichtungen für die Fräsräder und mit einer geregelten hydraulischen Druckausgleichsvorrichtung für die Lagerdichtungen.The invention relates to a milling frame for a trench cutter with oil-lubricated bearing seals for the cutting wheels and with a regulated hydraulic pressure compensation device for the bearing seals.

Mit Schlitzwandfräsen werden im Tiefbau Schlitze hergestellt, die bis zu 100 m tief sein können. Der Schlitz wird bis zur Herstellung der Schlitzwand mit einer Stützflüssigkeit aus einem Bentonit- und Wassergemisch gefüllt. Mit zunehmender Tiefe steigt der Flüssigkeitsdruck, so daß die Lagerdichtungen für die Fräsräder mit einer Druckausgleichsvorrichtung versehen sein müssen, um ein Eindringen von Stützflüssigkeit bzw. ein Lecken und Ölverlust zu verhindern. An bekannten Druckausgleichsvorrichtungen hatte sich bei schnellen Tiefenänderungen des Fräsrahmens bzw. bei schnellen Druckänderungen als problematisch erwiesen, den Innendruck der Lagerdichtungen entsprechend schnell nachzuführen.With trench cutters, slots are made in civil engineering that can be up to 100 m deep. The slot is filled with a support liquid made of a bentonite and water mixture until the slot wall is produced. With increasing depth, the fluid pressure rises, so that the bearing seals for the cutting wheels must be provided with a pressure compensation device in order to prevent the penetration of supporting fluid or leakage and oil loss. In known pressure compensation devices, rapid changes in the depth of the milling frame or rapid changes in pressure had proven problematic to track the internal pressure of the bearing seals accordingly quickly.

Eine derartige Druckausgleichsvorrichtung ist aus der DE-A-2162314 bekannt.Such a pressure compensation device is known from DE-A-2162314.

Der Erfindung liegt die Aufgabe zugrunde, einen Fräsrahmen mit einer Druckausgleichsvorrichtung der eingangs genannten Art anzugeben, mit welcher ein zuverlässiger Druckausgleich auch bei schnellen Druckänderungen durchgeführt wird.The invention has for its object to provide a milling frame with a pressure compensation device of the type mentioned, with which a reliable pressure compensation is carried out even with rapid pressure changes.

Diese Aufgabe wird dadurch gelöst, daß ein mit den Dichtungen über Leitungen verbundenes, druckfestes Ölreservoir vorhanden ist, daß ferner ein nach unten offener, luftgefüllter, dem Außendruck ausgesetzter, vertikal unter dem Ölreservoir angeordneter Pufferraum vorhanden ist, daß Ölreservoir und Pufferraum über einen längsverschiebbaren Kolben miteinander verbunden sind, und daß der Kolben mit einer Druckfeder in Richtung auf das Ölreservoir vorgespannt ist.This object is achieved in that there is a pressure-resistant oil reservoir connected to the seals via lines, and in addition that an air-filled, the buffer space, which is exposed to the external pressure and is arranged vertically below the oil reservoir, that the oil reservoir and the buffer space are connected to one another via a longitudinally displaceable piston, and that the piston is biased with a compression spring in the direction of the oil reservoir.

Die Erfindung hat den Vorteil, daß aufgrund der Federvorspannung einerseits ein fest vorgegebener, konstanter Überdruck im Ölreservoir und damit in den Lagerdichtungen erzeugt wird. Außerdem können auf diese Weise Leckageverluste ausgeglichen werden. Er verhindert auch bei schnell zunehmendem Außendruck das Eindringen von Stützflüssigkeit, selbst wenn der Kolben beispielsweise wegen einer Haftreibungswirkung nur verzögert oder zu träge ausgelenkt wird. Die im Pufferraum verdichtete Luft wirkt als Trennmedium zwischen der Stützflüssigkeit und den bewegbaren Teilen der Druckausgleichsvorrichtung, so daß dieser kritische und empfindliche Bereich gegen Verschmutzung geschützt ist.The invention has the advantage that, due to the spring preload, on the one hand a fixed, predetermined, constant overpressure is generated in the oil reservoir and thus in the bearing seals. Leakage losses can also be compensated for in this way. It prevents the penetration of support fluid even with rapidly increasing external pressure, even if the piston is only delayed or deflected too slowly, for example due to a static friction effect. The air compressed in the buffer space acts as a separating medium between the supporting liquid and the movable parts of the pressure compensation device, so that this critical and sensitive area is protected against contamination.

Eine bevorzugte Weiterbildung der Erfindung besteht darin, daß die Druckfeder als Schraubenfeder ausgebildet ist, die auf dem Kolben sitzt und die sich einerseits auf einem Flansch an einem Kolbengehäuse und andererseits an einer Schulter am Kolben abstützt.A preferred development of the invention is that the compression spring is designed as a helical spring which sits on the piston and which is supported on the one hand on a flange on a piston housing and on the other hand on a shoulder on the piston.

Eine besonders leichtgängige Führung wird dadurch erreicht, daß der Kolben auf seiner dem Ölreservoir zugewandten Seite mit einer Buchse versehen ist und daß die Druckfeder zwischen dem Kolben und der Buchse liegt.A particularly smooth guidance is achieved in that the piston is provided with a bush on its side facing the oil reservoir and in that the compression spring lies between the piston and the bush.

Es erweist sich als besonders zweckmäßig, daß die Buchse an ihrem freien Ende mit einem Boden versehen ist, an welchem die zugehörige Stirnseite des Kolbens von innen anliegt. Die Buchse, die auf diese Weise jede Kolbenbewegung mitmacht, bildet einen mit Hilfe einer Rollenmembran einen auf einfache Weise abdichtbaren, bewegbaren Verschluß des Ölreservoirs.It proves to be particularly expedient that the bush is provided at its free end with a bottom on which the associated end face of the piston bears from the inside. The bushing that follows every piston movement in this way, forms a movable seal of the oil reservoir that can be easily sealed with the aid of a roller membrane.

Eine schnelle Nachregelung wird ferner dadurch unterstützt, daß der Kolben zur Verringerung des Eigengewichts bzw. zur Verbesserung des Auftriebs hohl ausgebildet ist.A rapid readjustment is also supported in that the piston is hollow to reduce its own weight or to improve buoyancy.

Nachfolgend wird die Erfindung anhand eines in der Zeichnung dargestellten Ausführungsbeispieles weiter beschrieben.

Fig. 1
zeigt schematisch in einer perspektivischen Ansicht eine Schlitzwandfräse und
Fig. 2
zeigt einen Vertikalquerschnitt durch eine Druckausgleichsvorrichtung für die Lagerdichtungen eines Fräsrahmens der Schlitzwandfräse gemäß Fig. 1.
The invention is described below with reference to an embodiment shown in the drawing.
Fig. 1
shows schematically in a perspective view a trench cutter and
Fig. 2
shows a vertical cross section through a pressure compensation device for the bearing seals of a milling frame of the trench wall cutter according to FIG. 1.

Gemäß Fig. 1 umfaßt die hier dargestellte Schlitzwandfräse einen schienengeführten Wagen 10 mit einem Ausleger 11, an welchem über ein Tragseil 14 ein Fräsrahmen 12 aufgehängt ist. Am Fräsrahmen 12 befinden sich zwei Paar Fräsräder 13, die von Hydromotoren angetrieben werden. Ein mit einer Stützflüssigkeit aus einem Wasser-/Bentonitgemisch gefüllter Schlitz ist mit 15 bezeichnet.1, the trench wall cutter shown here comprises a rail-guided carriage 10 with a boom 11, on which a milling frame 12 is suspended via a supporting cable 14. On the milling frame 12 there are two pairs of milling wheels 13 which are driven by hydraulic motors. A slot filled with a support liquid made of a water / bentonite mixture is denoted by 15.

Am Fräsrahmen 12 ist eine Druckausgleichsvorrichtung 16 verschraubt, welche mit Öl geschmierten Lagerdichtungen (nicht dargestellt) der Fräsräder 13 leitungsverbunden ist. Die Druckausgleichsvorrichtung 16 dient dazu, den Öldruck in den Lagerdichtungen in Abhängigkeit vom Außendruck in der Stützflüssigkeit in der Weise nachzuregeln, daß weder Öl aus den Lagern austritt noch Stützflüssigkeit in die Lager eintritt.A pressure compensation device 16 is screwed to the milling frame 12 and is connected in line with oil-lubricated bearing seals (not shown) of the milling wheels 13. The pressure compensation device 16 serves to readjust the oil pressure in the bearing seals as a function of the external pressure in the supporting fluid in such a way that neither oil emerges from the bearings nor does the supporting fluid enter the bearings.

Die Druckausgleichsvorrichtung 16 umfaßt gemäß Fig. 2 ein druckfestes Ölreservoir 17, einen luftgefüllten Pufferraum 18 sowie einen vertikal längsverschiebbaren Druckkolben 19. Der Kolben 19 und das Ölreservoir 17 befinden sich in einem zylindrischen Gehäuse 20, welches über eine Halterung 21 am Fräsrahmen 12 (Fig. 1) verschraubt ist. Ferner ist eine den Pufferraum 18 umgebende Glocke 22, die im übrigen am Gehäuse 20 angeschweißt ist, mit einer Schraube 23 am Fräsrahmen gesichert.2 comprises a pressure-resistant oil reservoir 17, an air-filled buffer space 18 and a vertically longitudinally displaceable pressure piston 19. The piston 19 and the oil reservoir 17 are located in a cylindrical housing 20 which is attached to the milling frame 12 (FIG. 1) is screwed. Furthermore, a bell 22 surrounding the buffer space 18, which is welded to the housing 20, is secured with a screw 23 on the milling frame.

Das Ölreservoir 17 ist mit einer ersten Öffnung (24) zum Anschluß an eine Schlauchleitung versehen, die zu einem Druckmeßgerät führt (nicht dargestellt). Über eine zweite verschließbare Öffnung 25 kann das Ölreservoir befüllt bzw. nachgefüllt werden. Eine dritte Öffnung 26 dient zum Anschluß einer Schlauchverbindung hin zu den Lagerdichtungen (nicht dargestellt).The oil reservoir 17 is provided with a first opening (24) for connection to a hose line, which leads to a pressure measuring device (not shown). The oil reservoir can be filled or refilled via a second closable opening 25. A third opening 26 is used to connect a hose connection to the bearing seals (not shown).

Das im Gehäuse 20 integrierte Ölreservoir 17 ist einerseits durch eine Verlängerung 27 eines den Kolben 19 aufnehmenden Zylindermantels und andererseits durch einen stirnseitig angeflanschten Topf 28 gleicher Länge begrenzt. An der Verbindungsstelle von Topf 28 und Verlängerung 27 ist das Ende einer Rollenmembran 29 eingespannt, welche das Ölreservoir 17 gegen den Kolben 19 und die Kolbenführung abdichtet.The oil reservoir 17 integrated in the housing 20 is limited on the one hand by an extension 27 of a cylinder jacket receiving the piston 19 and on the other hand by a pot 28 of the same length flanged on the end face. At the junction of pot 28 and extension 27, the end of a roller membrane 29 is clamped, which seals the oil reservoir 17 against the piston 19 and the piston guide.

Der als Hohlkörper ausgebildete, vertikal verschiebbare Kolben 19 beaufschlagt mit einer Stirnseite großflächig das Ölreservoir 17 in der Weise, daß eine Kolbenverschiebung eine Druckänderung erzeugt. Eine Kolbenverschiebung wird dadurch ausgelöst, daß beim Absenken oder Anheben des Fräsrahmens die Stützflüssigkeit einen entsprechenden Druck auf das freie Ende des Kolbens 19 im Bereich des Pufferraums 18 ausübt.The vertically displaceable piston 19, which is designed as a hollow body, acts on one end face over a large area of the oil reservoir 17 in such a way that a piston displacement produces a pressure change. A piston displacement is triggered in that when the milling frame is lowered or raised, the supporting liquid exerts a corresponding pressure on the free end of the piston 19 in the region of the buffer space 18.

Der Kolben 19 ist durch eine hier als Schraubenfeder ausgebildete Druckfeder 30 gegen das Ölreservoir 17 vorgespannt. Daraus ergibt sich, daß der Innendruck im Ölreservoir 17 der Summe des Außendrucks im Schlitz 15 (Fig. 1) und der Federvorspannung besteht. Durch entsprechende Wahl der Federlänge bzw. des Federwegs kann die Federkraft über eine vorgegebene Wegstrecke konstant gehalten werden.The piston 19 is biased against the oil reservoir 17 by a compression spring 30 designed here as a helical spring. It follows that the internal pressure in the oil reservoir 17 consists of the sum of the external pressure in the slot 15 (FIG. 1) and the spring preload. The spring force can be kept constant over a predetermined distance by appropriate selection of the spring length or the spring travel.

Die Druckfeder 30, die den Kolben 19 umgibt, stützt sich auf einen Ringflansch 31 an der freien Stirnseite des Gehäuses 20 ab. Als Gegenstück ist am Kolben 19 eine Ringschulter 32 zur Abstützung der Druckfeder 30 ausgebildet.The compression spring 30, which surrounds the piston 19, is supported on an annular flange 31 on the free end face of the housing 20. As a counterpart, an annular shoulder 32 for supporting the compression spring 30 is formed on the piston 19.

Im Gehäuse 20 ist auf den Kolben 19 eine Buchse 33 gesetzt, welche die Druckfeder 30 außenseitig übergreift, so daß diese zwischen Buchse 33 und Kolben 19 zu liegen kommt. Der Kolben 19 selbst und die Druckfeder 30 sind außer Kontakt mit der Gehäusewand. Durch entsprechende Wahl des Buchsenmaterials kann eine leichtgängige Kolbenführung erreicht werden. Die Buchse 33 ist ferner mit einem Boden 34 versehen, auf welchem sich einerseits die Stirnseite des Kolbens 19 abstützt und andererseits die Rollenmembran 29 zu liegen kommt.In the housing 20, a bushing 33 is placed on the piston 19, which overlaps the compression spring 30 on the outside, so that it comes to rest between the bushing 33 and the piston 19. The piston 19 itself and the compression spring 30 are out of contact with the housing wall. A suitable piston guide can be achieved by appropriate selection of the bushing material. The bushing 33 is also provided with a base 34 on which the end face of the piston 19 is supported on the one hand and the roller membrane 29 comes to rest on the other hand.

Im Pufferraum 18 befindet sich eine Luftblase, welche verhindert, daß Stützflüssigkeit zwischen die bewegten Teile, insbesondere in die Kolbenführung, gelangt.There is an air bubble in the buffer space 18, which prevents support fluid from getting between the moving parts, in particular into the piston guide.

Claims (5)

  1. Cutter frame for a slotted wall milling cutter with oil-lubricated bearing seals for the cutter wheels and with a regulated hydraulic pressure compensating device for the bearing seals,
    characterized in that
    a pressure-resistant oil reservoir (17) connected to the bearing seals by means of lines is provided,
    also a downwardly open, air filled, external pressure-exposed buffer chamber (18) is positioned vertically below the oil reservoir (17),
    oil reservoir (17) and buffer chamber (18) are interconnected by means of a longitudinally displaceable piston (19) and
    the piston (19) is preloaded with a compression spring (30) in the direction of the oil reservoir (17).
  2. Cutter frame according to claim 1,
    characterized in that
    the compression spring (30) is constructed as a helical spring placed on the piston (19) and which is supported on the one hand on a flange (31) on a piston casing (20) and on the other on a shoulder (32) on the piston (19).
  3. Cutter frame according to claims 1 or 2,
    characterized in that
    on its side facing the oil reservoir (17), the piston (19) is provided with a bushing (33) and that the compression spring (30) is positioned between the piston (19) and the bushing (33).
  4. Cutter frame according to claim 3,
    characterized in that
    at its free end the bushing (33) is provided with a base (34) on which engages from the inner side of the associated end face of the piston (19).
  5. Cutter frame according to one of the preceding claims,
    characterized in that
    the piston (19) is hollow.
EP92109755A 1991-06-11 1992-06-10 Frame for a milling device for slits with pressure compensation for the bearing closures Expired - Lifetime EP0518293B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9107187U DE9107187U1 (en) 1991-06-11 1991-06-11
DE9107187U 1991-06-11

Publications (2)

Publication Number Publication Date
EP0518293A1 EP0518293A1 (en) 1992-12-16
EP0518293B1 true EP0518293B1 (en) 1994-08-31

Family

ID=6868200

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92109755A Expired - Lifetime EP0518293B1 (en) 1991-06-11 1992-06-10 Frame for a milling device for slits with pressure compensation for the bearing closures

Country Status (6)

Country Link
EP (1) EP0518293B1 (en)
JP (1) JP2598204B2 (en)
KR (1) KR960004272B1 (en)
AT (1) ATE110819T1 (en)
DE (2) DE9107187U1 (en)
TW (1) TW205017B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1529924A1 (en) 2003-11-04 2005-05-11 BAUER Maschinen GmbH Pressurized gerabox and method of regulating pressure inside said gearbox

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4119210C1 (en) * 1991-06-11 1993-01-21 Bauer Spezialtiefbau Gmbh, 8898 Schrobenhausen, De
FR2792342B1 (en) * 1999-04-16 2001-08-17 Spie Fond S METHOD AND DEVICE FOR POSITIONING PREFOUNDED POSTS
EP1666671B1 (en) * 2004-12-03 2015-11-04 BAUER Maschinen GmbH Milling device for trench walls
PL2623677T3 (en) * 2012-01-31 2015-04-30 Bauer Spezialtiefbau Assembly and method for manufacturing a slotted wall element
CN107083737A (en) * 2017-06-19 2017-08-22 侯忠备 A kind of milling machine floating material collecting device
DE102018131226A1 (en) * 2018-12-06 2020-06-10 Liebherr-Werk Nenzing Gmbh Special civil engineering machine, especially trench cutter
DE202019102477U1 (en) * 2019-02-27 2020-06-03 Liebherr-Components Biberach Gmbh Drive device for a trench cutter
BE1027388B9 (en) * 2019-06-13 2021-04-26 Changsha Inst Mining Res Co Ltd EXTRACTION HEAD FOR EXTRACTION OF COBALT-RICH DEEP-SEA CRUST

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5117201B1 (en) * 1971-05-13 1976-06-01
DE3728866A1 (en) * 1987-08-28 1989-03-16 Bauer Spezialtiefbau SLOT WALL MILLING

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1529924A1 (en) 2003-11-04 2005-05-11 BAUER Maschinen GmbH Pressurized gerabox and method of regulating pressure inside said gearbox
US7789201B2 (en) 2003-11-04 2010-09-07 Bauer Maschinen Gmbh Gear unit and method for controlling an internal pressure in the gear unit

Also Published As

Publication number Publication date
KR930000791A (en) 1993-01-15
JPH06316932A (en) 1994-11-15
EP0518293A1 (en) 1992-12-16
KR960004272B1 (en) 1996-03-30
DE9107187U1 (en) 1991-07-25
ATE110819T1 (en) 1994-09-15
DE59200433D1 (en) 1994-10-06
TW205017B (en) 1993-05-01
JP2598204B2 (en) 1997-04-09

Similar Documents

Publication Publication Date Title
EP0518293B1 (en) Frame for a milling device for slits with pressure compensation for the bearing closures
DE2716701C3 (en) Pile driver
DE2611700A1 (en) SELF-WORKING DEVICE FOR ALIGNING AN EARTH DRILLING RIG
DE2250024B2 (en) Rotary drill bit
DE1948122B2 (en) Inspection device for tubular objects
DE2722912C2 (en) Controllable deflection roller
DE2440094A1 (en) ELEVATOR BUFFER
DE19743411A1 (en) Hydraulic ram for lifting heavy workpieces
DE2109080C3 (en) Installation in a hydrostatic bearing provided with pressure chambers
DE2418392A1 (en) CORE DRILLING DEVICE
EP1171719B1 (en) Hydrostatic bearing device
DE1765114B2 (en) DEVICE FOR PUSHING AND LEADING THE ELECTRODE OF MACHINES FOR ELECTROEROSION
DE1519902C3 (en) Device for crucible-free zone melting of a crystalline rod, in particular a semiconductor rod
DE525135C (en) Luenette with flexible guide parts for machine tools
DE3247697A1 (en) DEVICE FOR DETERMINING AND / OR MEASURING THE FORM OF A WORKPIECE
DE3125688C2 (en) Arrangement for sealing a displaceable cylindrical body in a housing opening
EP0486752A1 (en) Directional drill string comprising a pipe with a shaft bearing
DE957016C (en) Diaphragm piston pump especially for pumping fluids from great depths
DE19629298C2 (en) Sealed bushing for electrical erosion machines
DE2427375A1 (en) SEAL WITH PUSH FORCE
DE2110454B2 (en) Device for inducing pulsations in a liquid in an extraction column and method for operating the device
DE3227235C2 (en)
DE4202554C1 (en) Drill rig with vertical guide rod and feed table - has drive with cable whose ends are secured to top and lower guide rod sections respectively
DE2436060A1 (en) PUMPING DEVICE
DE3110337A1 (en) Sensor for detecting path lengths

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE ES FR GB IT LI LU NL

17P Request for examination filed

Effective date: 19921111

17Q First examination report despatched

Effective date: 19940113

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE ES FR GB IT LI LU NL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19940831

Ref country code: BE

Effective date: 19940831

Ref country code: GB

Effective date: 19940831

Ref country code: ES

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 19940831

REF Corresponds to:

Ref document number: 110819

Country of ref document: AT

Date of ref document: 19940915

Kind code of ref document: T

REF Corresponds to:

Ref document number: 59200433

Country of ref document: DE

Date of ref document: 19941006

ITF It: translation for a ep patent filed

Owner name: STUDIO JAUMANN

ET Fr: translation filed
NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
GBV Gb: ep patent (uk) treated as always having been void in accordance with gb section 77(7)/1977 [no translation filed]

Effective date: 19940831

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19950630

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19960507

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19960627

Year of fee payment: 5

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Effective date: 19970610

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19970630

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19970630

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: FR

Ref legal event code: TP

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20110624

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20110629

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20110628

Year of fee payment: 20

REG Reference to a national code

Ref country code: DE

Ref legal event code: R071

Ref document number: 59200433

Country of ref document: DE

REG Reference to a national code

Ref country code: DE

Ref legal event code: R071

Ref document number: 59200433

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20120612