EP0587848A1 - Multistage hydraulic cylinder - Google Patents

Multistage hydraulic cylinder

Info

Publication number
EP0587848A1
EP0587848A1 EP93906519A EP93906519A EP0587848A1 EP 0587848 A1 EP0587848 A1 EP 0587848A1 EP 93906519 A EP93906519 A EP 93906519A EP 93906519 A EP93906519 A EP 93906519A EP 0587848 A1 EP0587848 A1 EP 0587848A1
Authority
EP
European Patent Office
Prior art keywords
cylinder
stroke
hollow piston
stage
long
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.)
Ceased
Application number
EP93906519A
Other languages
German (de)
French (fr)
Inventor
Heinz Guido
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.)
MAN Gutehoffnungshutte GmbH
Original Assignee
MAN Gutehoffnungshutte 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 MAN Gutehoffnungshutte GmbH filed Critical MAN Gutehoffnungshutte GmbH
Publication of EP0587848A1 publication Critical patent/EP0587848A1/en
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/16—Characterised by the construction of the motor unit of the straight-cylinder type of the telescopic type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
    • F15B11/036—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force by means of servomotors having a plurality of working chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7055—Linear output members having more than two chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7057—Linear output members being of the telescopic type

Definitions

  • the invention relates to a multi-stage hydraulic cylinder and a method for moving a load with different degrees of load (back pressure) and different stroke paths with the aid of this multi-stage hydraulic cylinder.
  • Multi-stage hydraulic cylinders for moving loads are generally known.
  • Telescopic cylinders of known types according to the preamble have the disadvantage that they require space for the necessary supporting structure in addition to the overall length of the cylinder.
  • all components of the telescopic cylinder must be designed so that they can absorb the forces generated by each cylinder stage. With a large difference in force between the individual cylinder stages, this characteristic of the telescopic cylinder inevitably leads to an elaborate structural design of the cylinder.
  • the object of the invention is to provide a multi-stage hydraulic cylinder which is able to move loads with different load levels and stroke paths, which has a compact design, the smallest possible height and can be manufactured more cost-effectively than multi-stage lifting cylinders known design.
  • a multi-stage hydraulic cylinder is created that can generate high pressure with a short stroke in the first stroke stage. This first lifting stage is based on the
  • This hollow piston is designed according to the invention such that it simultaneously represents the cylinder tube of the multi-stage telescopic cylinder arranged in its interior.
  • pressurization at the connection piece of the first lifting stage moves a large load during the initial lifting movement.
  • This load consists of a physical load, increased by
  • the piston of stage III runs up to the load and takes over the same. Levels II and III extend and finally move the load up to
  • Such a multi-stage hydraulic cylinder can be used as a three-stage lifting system, for example on a direct-current arc furnace, around a 3 approx. 26.0 ton bottom electrode Corresponding wear or burning out of the refractory lining of the electric furnace and thus push it into the interior of the furnace space.
  • the pressure to be applied in the first stage of the three-stage system can be up to approx. 100 t in order to loosen the ground electrode that is firmly sintered and stamped into the stove base and to raise it by approx. 300 mm.
  • the detached floor electrode can be raised by the two inner lifting cylinders (stages II and III) by approx. 2000 mm in order to be picked up by another lifting device, e.g. an indoor crane, and taken to a storage or repair location in the Hall of the steel mill to be driven and dropped off there.
  • Fig. 3 shows a section of the three-stage lifting cylinder in the extended state
  • Fig. 4 shows the arrangement of the three-stage lifting cylinder below the bottom electrode of a DC arc furnace.
  • the hydraulic cylinder shown in Figures 1 to 3 is a three-stage cylinder, consisting of a first cylinder stage I, which is designed as a hollow piston cylinder with a cylinder tube (1), the piston (2) and the hollow piston rod (3).
  • Two long-stroke cylinders (4, 6) are arranged as telescopic cylinders in the hollow piston rod (3).
  • the hollow piston rod (3) has a stroke limitation (5) for the telescopic piston (4) of stage II and the telescopic piston (4) in turn has a stroke limitation (7) for the telescopic cylinder (6) of stage III.
  • Pressure medium connections (8) for lifting and (9) for lowering stage I are provided on the cylinder tube (1).
  • the corresponding connections (10, 11) for the pressure medium for stages II and III are (for lifting) below the hollow piston rod (3) and (for lowering) laterally in the upper area of the hollow piston rod (3).
  • (13) denotes a stationary support on which the stage I cylinder can be supported.
  • Fig. 1 shows the three-stage lifting cylinder in the retracted state.
  • Fig. 3 shows the three-stage lifting cylinder in the fully extended state, ie here are both Telescopic cylinder (4, 6) extended up to their stroke limits.
  • Patent figures 1 to 3 generally show the use of the hydraulic cylinder according to the invention as a lifting cylinder for lifting and lowering a load (12).
  • the device according to the invention can in principle also be used for moving loads in other directions.
  • Fig. 4 shows the use of a three-stage lifting system using a practical example, namely for pressing out the bottom electrode from the furnace hearth of a DC arc furnace in accordance with the information in the introduction to the description.
  • the bottom electrode (14) is in the hearth of a DC arc furnace and should be replaced by a new or reconditioned bottom electrode after wear.
  • the base electrode With the help of the multi-stage cylinders (16) arranged below the furnace vessel on the circumference of the base electrode and pressing from below against the base plate (15) of the base electrode (14), the base electrode is initially under high back pressure (weight of the base electrode approx. 26 t) the hollow piston cylinder (1, 2, 3) is pressurized with pressure medium. It is thereby achieved that the bottom electrode (14) is broken off from the composite with the surrounding refractory material of the stove. The long-stroke cylinders then lift the bottom electrode into the interior of the furnace of the arc furnace with less back pressure. The worn bottom electrode can then be removed from the furnace by a gripper.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)

Abstract

Un vérin hydraulique à plusieurs étages sert à déplacer des charges. Un premier cylindre à piston creux (1, 2, 3) contient au moins un autre cylindre (4) à longue course dans sa tige creuse (3) de piston, qui forme en même temps le tube cylindrique du ou des cylindres (4, 6) à longue course. Le rapport entre la surface active du cylindre à piston creux et la surface active des cylindres à longue course est compris entre 2:1 et 50:1 au maximum. Selon un procédé de déplacement d'une charge avec des facteurs d'utilisation divers et des courses de longueurs différentes au moyen de ce vérin hydraulique à plusieurs étages, on applique premièrement du fluide sous pression au cylindre (1, 2, 3) à piston creux, au début avec une contre-pression élevée, puis on applique du fluide sous pression au cylindre à longue course, avec une contre-pression réduite, afin de déplacer la charge.A multi-stage hydraulic cylinder is used to move loads. A first hollow piston cylinder (1, 2, 3) contains at least one further long stroke cylinder (4) in its hollow piston rod (3), which at the same time forms the cylindrical tube of the cylinder or cylinders (4, 6) long stroke. The ratio of the active area of the hollow piston cylinder to the active area of the long stroke cylinders is from 2: 1 to 50: 1 at most. According to a method of moving a load with different duty cycle and different length strokes by means of this multistage hydraulic cylinder, pressurized fluid is first applied to the piston cylinder (1, 2, 3) hollow, initially with high back pressure, then pressurized fluid is applied to the long stroke cylinder with reduced back pressure to move the load.

Description

Mehrstufiger hydraulischer ZylinderMulti-stage hydraulic cylinder
Die Erfindung betrifft einen mehrstufigen hydraulischen Zylinder und ein Verfahren zum Bewegen einer Last mit verschiedenen Belastungsgraden (Gegendrücken) und unterschiedlichen Hubwegen mit Hilfe dieses mehrstufigen hydraulischen Zylinders.The invention relates to a multi-stage hydraulic cylinder and a method for moving a load with different degrees of load (back pressure) and different stroke paths with the aid of this multi-stage hydraulic cylinder.
Mehrstufige hydraulische Zylinder zum Bewegen von Lasten sind grundsätzlich bekannt. Teleskopzylinder bekannter Bauarten nach dem Oberbegriff weisen jedoch den Nachteil auf, daß sie zusätzlich zu der Zylinderbaulänge noch Platz für die erforderliche Tragkonstruktion benötigen. Darüber hinaus müssen alle Bauteile des Teleskopzylinders so gestaltet sein, daß sie die Kräfte aufnehmen können, die von einer jeden Zylinderstufe erzeugt werden. Bei einem großen Kraftunterschied zwischen den einzelnen Zylinderstufen führt diese Eigenart der Teleskopzylinder zwangsläufig zu einer aufwendigen konstruktiven Gestaltung des Zylinders.Multi-stage hydraulic cylinders for moving loads are generally known. Telescopic cylinders of known types according to the preamble, however, have the disadvantage that they require space for the necessary supporting structure in addition to the overall length of the cylinder. In addition, all components of the telescopic cylinder must be designed so that they can absorb the forces generated by each cylinder stage. With a large difference in force between the individual cylinder stages, this characteristic of the telescopic cylinder inevitably leads to an elaborate structural design of the cylinder.
Die Aufgabe der Erfindung ist darin zu sehen, einen mehrstufigen hydraulischen Zylinder zu schaffen, der in der Lage ist, Lasten mit verschiedenen Belastungsgraden und Hubwegen zu bewegen, der eine kompakte Bauform aufweist, eine möglichst geringe Bauhöhe besitzt und sich kostengünstiger herstellen läßt als mehrstufige Hubzylinder bekannter Bauart.The object of the invention is to provide a multi-stage hydraulic cylinder which is able to move loads with different load levels and stroke paths, which has a compact design, the smallest possible height and can be manufactured more cost-effectively than multi-stage lifting cylinders known design.
Die Lösung der Aufgabe erfolgt in der Weise, wie es in den Patentansprüchen angegeben ist. 1 Entsprechend der Aufgabenstellung wird somit ein mehrstufiger hydraulischer Zylinder geschaffen, der in der ersten Hubstufe einen hohen Druck bei kurzem Hubweg erzeugen kann. Diese erste Hubstufe basiert auf dem anThe problem is solved in the manner as specified in the claims. 1 In accordance with the task, a multi-stage hydraulic cylinder is created that can generate high pressure with a short stroke in the first stroke stage. This first lifting stage is based on the
_- sich bekannten Prinzip des Hohlkolbenzylinders, wobei die Last auf einem Hohlkolben aufgelagert ist. Dieser Hohlkolben ist erfindungsgemäß so ausgestaltet, daß er gleichzeitig das Zylinderrohr des in seinem Inneren angeordneten mehrstufigen Teleskopzylinders darstellt.Known principle of the hollow piston cylinder, the load being supported on a hollow piston. This hollow piston is designed according to the invention such that it simultaneously represents the cylinder tube of the multi-stage telescopic cylinder arranged in its interior.
1010
Im Ausführungsbeispiel bewegt eine Druckbeaufschlagung am Anschlußstutzen der ersten Hubstufe bei der anfänglichen Hubbewegung eine große Last. Diese Last besteht aus einer physikalischen Last, vergrößert umIn the exemplary embodiment, pressurization at the connection piece of the first lifting stage moves a large load during the initial lifting movement. This load consists of a physical load, increased by
-je ein bestimmtes Losbrechmoment. Nach Beendigung des kurzen Hubes innerhalb der ersten Hubstufe ist das Losbrechmoment überwunden und es braucht in der oder den weiteren Stufen der Hubbewegung nur noch die Last allein bewegt zu werden. Hierzu werden die entsprechenden Hubstufen II und III am- j e a certain breakaway torque. After the end of the short stroke within the first stroke stage, the breakaway torque is overcome and only the load needs to be moved in the further stages of the stroke movement. For this purpose, the corresponding lifting stages II and III on
Druckmediumanschluß druckbeaufschlagt. Im Ausführungsbeispiel fährt der Kolben der Stufe III bis gegen die Last und übernimmt dieselbe. Die Stufen II und III fahren aus und bewegen die Last schließlich bisMedia port pressurized. In the exemplary embodiment, the piston of stage III runs up to the load and takes over the same. Levels II and III extend and finally move the load up to
2 in ihre Endstellung.2 in their end position.
Beim Zurückfahren bzw. Absenken des beispielsweise dreistufigen Hubzylinders sind nur niedrige Gegendrücke bzw. Lasten aufzunehmen und in die gewünschte 30 Endposition zurückzufahren.When retracting or lowering the three-stage lifting cylinder, for example, only low back pressures or loads need to be absorbed and returned to the desired end position.
ein solcher mehrstufiger hydraulischer Zylinder kann als dreistufiges Hubsystem beispielsweise an einem Gleichstromlichtbogenofen eingesetzt werden, um eine 3 ca. 26,0 Tonnen schwere Bodenelektrode nach entsprechendem Verschleiß bzw. Abbrand aus dem mit Feuerfestmaterial ausgekleideten Herdboden des Elektroofens heraus- und somit in das Innere des Ofenraumes hineinzudrücken.Such a multi-stage hydraulic cylinder can be used as a three-stage lifting system, for example on a direct-current arc furnace, around a 3 approx. 26.0 ton bottom electrode Corresponding wear or burning out of the refractory lining of the electric furnace and thus push it into the interior of the furnace space.
Der aufzuwendende Druck der ersten Stufe des insgesamt dreistufigen Systems kann bis zu ca. 100 t betragen, um die mit dem Herdboden fest versinterte und eingestampfte Bodenelektrode zu lösen und um ca. 300 mm anzuheben. In der zweiten und dritten Stufe kann die losgelöste Bodenelektrode durch die beiden inneren Hubzylinder (Stufen II und III) um ca. 2000 mm angehoben werden, um von einem anderen Hebezeug, beispielsweise einem Hallenkran, aufgenommen und zu einem Abstell- bzw. Reparaturplatz in der Halle des Stahlwerkes gefahren und dort abgesetzt zu werden.The pressure to be applied in the first stage of the three-stage system can be up to approx. 100 t in order to loosen the ground electrode that is firmly sintered and stamped into the stove base and to raise it by approx. 300 mm. In the second and third stages, the detached floor electrode can be raised by the two inner lifting cylinders (stages II and III) by approx. 2000 mm in order to be picked up by another lifting device, e.g. an indoor crane, and taken to a storage or repair location in the Hall of the steel mill to be driven and dropped off there.
In den Patentfiguren ist die Erfindung anhand von im Prinzip dargestellten Ausführungsbeispielen erläutert.The invention is explained in the patent figures on the basis of exemplary embodiments shown in principle.
Es zeigen:Show it:
Fig. 1 einen Schnitt des dreistufigen Hubzylinders in eingefahrenem Zustand,1 shows a section of the three-stage lifting cylinder in the retracted state,
Fig. 2 einen Schnitt des dreistufigen Hubzylinders mit ausgefahrener Stufe I,2 shows a section of the three-stage lifting cylinder with extended stage I,
Fig. 3 einen Schnitt des dreistufigen Hubzylinders im ausgefahrenen Zustand undFig. 3 shows a section of the three-stage lifting cylinder in the extended state and
Fig. 4 die Anordnung der dreistufigen Hubzylinder unterhalb der Bodenelektrode eines Gleichstromlichtbogenofens. Bei dem in den Figuren 1 bis 3 dargestellten hydraulischen Zylinder handelt es sich um einen dreistufigen Zylinder, bestehend aus einer ersten Zylinderstufe I, die als Hohlkolbenzylinder mit einem Zylinderrohr (1), dem Kolben (2) und der Hohlkolbenstange (3) ausgebildet ist.Fig. 4 shows the arrangement of the three-stage lifting cylinder below the bottom electrode of a DC arc furnace. The hydraulic cylinder shown in Figures 1 to 3 is a three-stage cylinder, consisting of a first cylinder stage I, which is designed as a hollow piston cylinder with a cylinder tube (1), the piston (2) and the hollow piston rod (3).
In der Hohlkolbenstange (3) sind zwei langhubige Zylinder (4, 6) als Teleskopzylinder angeordnet.Two long-stroke cylinders (4, 6) are arranged as telescopic cylinders in the hollow piston rod (3).
Die Hohlkolbenstange (3) weist eine Hubbegrenzung (5) für den Teleskopkolben (4) der Stufe II auf und der Teleskopkolben (4) wiederum eine Hubbegrenzung (7) für den Teleskopzylinder (6) der Stufe III.The hollow piston rod (3) has a stroke limitation (5) for the telescopic piston (4) of stage II and the telescopic piston (4) in turn has a stroke limitation (7) for the telescopic cylinder (6) of stage III.
An dem Zylinderrohr (1) sind Druckmediumanschlüsse (8) für das Heben und (9) für das Senken der Stufe I vorgesehen. Die entsprechenden Anschlüsse (10, 11) für das Druckmedium für die Stufen II und III befinden sich (für das Heben) unterhalb der Hohlkolbenstange (3) und (für das Senken) seitlich im oberen Bereich der Hohlkolbenstange (3).Pressure medium connections (8) for lifting and (9) for lowering stage I are provided on the cylinder tube (1). The corresponding connections (10, 11) for the pressure medium for stages II and III are (for lifting) below the hollow piston rod (3) and (for lowering) laterally in the upper area of the hollow piston rod (3).
Mit (13) ist eine stationäre Abstützung bezeichnet, auf der sich der Zylinder der Stufe I abstützen kann.(13) denotes a stationary support on which the stage I cylinder can be supported.
Fig. 1 zeigt den dreistufigen Hubzylinder in eingefahrenem Zustand.Fig. 1 shows the three-stage lifting cylinder in the retracted state.
In Fig. 2 erkennt man, daß die Hohlkolbenstange (3) als Stufe I nach oben ausgefahren ist.In Fig. 2 it can be seen that the hollow piston rod (3) is extended as stage I upwards.
Fig. 3 zeigt den dreistufigen Hubzylinder im voll ausgefahrenen Zustand, d.h. hier sind beide Teleskopzylinder (4, 6) bis zu ihren Hubbegrenzungen ausgefahren.Fig. 3 shows the three-stage lifting cylinder in the fully extended state, ie here are both Telescopic cylinder (4, 6) extended up to their stroke limits.
In den Patentfiguren 1 bis 3 ist allgemein die Anwendung des erfindungsgemäßen hydraulischen Zylinders als Hubzylinder zum Heben und Absenken einer Last (12) dargestellt. Selbstverständlich läßt sich die erfindungsgemäße Vorrichtung grundsätzlich auch für die Bewegung von Lasten in andere Richtungen verwenden.Patent figures 1 to 3 generally show the use of the hydraulic cylinder according to the invention as a lifting cylinder for lifting and lowering a load (12). Of course, the device according to the invention can in principle also be used for moving loads in other directions.
Fig. 4 zeigt die Verwendung eines dreistufigen Hubsystems an einem praktischen Beispiel, nämlich zum Ausdrücken der Bodenelektrode aus dem Ofenherd eines Gleichstromlichtbogenofens entsprechend dem Hinweis in der Beschreibungseinleitung.Fig. 4 shows the use of a three-stage lifting system using a practical example, namely for pressing out the bottom electrode from the furnace hearth of a DC arc furnace in accordance with the information in the introduction to the description.
Die Bodenelektrode (14) befindet sich im Herd eines Gleichstromlichtbogenofens und soll nach Verschleiß durch eine neue oder überholte Bodenelektrode ersetzt werden. Mit Hilfe der unterhalb des Ofengefäßes am Umfang der Bodenelektrode angeordneten mehrstufigen Zylinder (16), die von unten gegen das Bodenblech (15) der Bodenelektrode (14) drücken, wird gemäß Patentanspruch 5 die Bodenelektrode unter anfänglich hohem Gegendruck (Gewicht der Bodenelektrode ca. 26 t) der Hohlkolbenzylinder (1, 2, 3) mit Druckmedium beaufschlagt. Dadurch wird erreicht, daß die Bodenelektrode (14) aus dem Verbund mit dem sie umgebenden feuerfesten Material des Ofenherdes losgebrochen wird. Anschließend heben die langhubigen Zylinder unter geringerem Gegendruck die Bodenelektrode ins Innere des Ofengefäßes des Lichtbogenofens. Die verschlissene Bodenelektrode kann sodann von einem Greifer aus dem Ofen entnommen werden. Bezugsziffernliste:The bottom electrode (14) is in the hearth of a DC arc furnace and should be replaced by a new or reconditioned bottom electrode after wear. With the help of the multi-stage cylinders (16) arranged below the furnace vessel on the circumference of the base electrode and pressing from below against the base plate (15) of the base electrode (14), the base electrode is initially under high back pressure (weight of the base electrode approx. 26 t) the hollow piston cylinder (1, 2, 3) is pressurized with pressure medium. It is thereby achieved that the bottom electrode (14) is broken off from the composite with the surrounding refractory material of the stove. The long-stroke cylinders then lift the bottom electrode into the interior of the furnace of the arc furnace with less back pressure. The worn bottom electrode can then be removed from the furnace by a gripper. List of reference numbers:
1 Zylinderrohrstufe I1 cylinder tube stage I
2 Kolbenstufe I2 piston stage I
3 Hohlkolbenstange I3 hollow piston rod I
4 Teleskopkolben, Stufe II4 telescopic pistons, stage II
5 Hubbegrenzung, Stufe II5 Stroke limitation, level II
6 Teleskopkolben, Stufe III6 telescopic pistons, stage III
7 Hubbegrenzung, Stufe III7 Stroke limitation, stage III
8 Druckmediumanschluß für Heben, Stufe I8 Pressure medium connection for lifting, level I
9 Druckmediumanschluß für Senken, Stufe I9 Pressure medium connection for sinks, level I
10 Druckmediumanschluß für Heben, Stufen II und III10 Pressure medium connection for lifting, levels II and III
11 Druckmediumanschluß für Senken, Stufen II und III11 Pressure medium connection for sinks, levels II and III
12 Last12 load
13 Abstützung13 support
14 Bodenelektrode eines Gleichstromlichtbogenofens14 bottom electrode of a DC arc furnace
15 Bodenblech von 1415 floor panel of 14
16 mehrstufige hydraulische Zylinder16 multi-stage hydraulic cylinders
ERSATZBLATT HE SATZB LATT

Claims

Patentansprüche: Claims:
1. Mehrstufiger hydraulischer Zylinder zum Bewegen von Lasten mit verschiedenen Belastungsgraden und Hubwegen, dadurch gekennzeichnet, daß ein erster Zylinder als Hohlkolbenzylinder (1, 2, 3) ausgebildet ist, in dessen hohler Kolbenstange (3) mindestens ein weiterer langhubiger Zylinder (4) angeordnet ist, daß die hohle Kolbenstange (3) gleichzeitig das Zylinderrohr des langhubigen Zylinders (4) ist und daß Druckmedienanschlüsse (8, 9, 10, 11) für das Bewegen der Zylinder angeordnet sind.1. Multi-stage hydraulic cylinder for moving loads with different degrees of load and stroke paths, characterized in that a first cylinder is designed as a hollow piston cylinder (1, 2, 3), in the hollow piston rod (3) at least one further long-stroke cylinder (4) arranged is that the hollow piston rod (3) is at the same time the cylinder tube of the long-stroke cylinder (4) and that pressure medium connections (8, 9, 10, 11) are arranged for moving the cylinders.
2. Mehrstufiger hydraulischer Zylinder nach Anspruch 1, dadurch gekennzeichnet, daß der in der hohlen Kolbenstange (3) angeordnete langhubige Zylinder ein mehrstufiger Teleskopzylinder (4, 6) ist.2. Multi-stage hydraulic cylinder according to claim 1, characterized in that the long-stroke cylinder arranged in the hollow piston rod (3) is a multi-stage telescopic cylinder (4, 6).
3. Mehrstufiger hydraulischer Zylinder nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß das Verhältnis von Wirkfläche des Hohlkolbenzylinders zur Wirkfläche des langhubigen Zylinders bzw. der langhubigen Zylinder 2 : 1 bis max. 50 : 1 beträgt.3. Multi-stage hydraulic cylinder according to claims 1 and 2, characterized in that the ratio of the effective area of the hollow piston cylinder to the effective area of the long-stroke cylinder or the long-stroke cylinder 2: 1 to max. Is 50: 1.
4. Mehrstufiger hydraulischer Zylinder nach den4. Multi-stage hydraulic cylinder according to the
Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß für das Bewegen des Hohlkolbenzylinders (1, 2, 3) und für das Bewegen des langhubigen ZylindersClaims 1 to 3, characterized in that for moving the hollow piston cylinder (1, 2, 3) and for moving the long-stroke cylinder
ERSÄTZBLATT (4) bzw. der langhubigen Zylinder (4, 6) getrennte Druckmedienanschlüsse (8, 9, 10, 11) angeordnet sind.REPLACEMENT LEAF (4) or the long-stroke cylinder (4, 6) separate print media connections (8, 9, 10, 11) are arranged.
Verfahren zum Bewegen einer Last mit verschiedenen Belastungsgraden (Gegendrücken) und unterschiedlichen Hubwegen mit Hilfe eines mehrstufigen hydraulischen Zylinders nach den Ansprüchen 1 bis 4, dadurch gekennzeichnet, daß zum Bewegen der Last (12) unter anfänglich hohem Gegendruck zuerst der Hohlkolbenzylinder (1, 2, 3) mit Druckmedium beaufschlagt wird, danach zum Bewegen der Last (12) unter geringerem Gegendruck der langhubige Zylinder (4) bzw. die langhubigen Zylinder (4, 6) mit Druckmedium beaufschlagt werden.Method for moving a load with different degrees of load (counter pressure) and different stroke paths with the aid of a multi-stage hydraulic cylinder according to claims 1 to 4, characterized in that for moving the load (12) under initially high counter pressure the hollow piston cylinder (1, 2, 3) is pressurized with pressure medium, then to move the load (12) under lower back pressure the long-stroke cylinder (4) or the long-stroke cylinder (4, 6) are pressurized with pressure medium.
ERSATZBLATT REPLACEMENT LEAF
EP93906519A 1992-03-25 1993-03-13 Multistage hydraulic cylinder Ceased EP0587848A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4209649A DE4209649C2 (en) 1992-03-25 1992-03-25 Multi-stage hydraulic pressure cylinder
DE4209649 1992-03-25

Publications (1)

Publication Number Publication Date
EP0587848A1 true EP0587848A1 (en) 1994-03-23

Family

ID=6454956

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93906519A Ceased EP0587848A1 (en) 1992-03-25 1993-03-13 Multistage hydraulic cylinder

Country Status (8)

Country Link
EP (1) EP0587848A1 (en)
JP (1) JPH06508424A (en)
KR (1) KR100279336B1 (en)
CN (1) CN1032713C (en)
DE (1) DE4209649C2 (en)
RU (1) RU2089757C1 (en)
TR (1) TR28546A (en)
WO (1) WO1993019302A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE170749T1 (en) * 1992-09-24 1998-09-15 Sepracor Inc USE OF (-)CETIRIZINE FOR THE TREATMENT OF ALLERGIC RHINITIS AND AND ASTHMA
US7980319B2 (en) 2005-08-03 2011-07-19 Komatsu Ltd. Motor grader
DE102011013987B4 (en) * 2011-03-15 2021-03-11 Liebherr Mining Equipment Co. Multi-stage hydraulic cylinder assembly
CN103111572A (en) * 2013-02-02 2013-05-22 湖南千跃机械制造有限公司 Rail wheel forging machine and production method of rail wheels
CN104405723A (en) * 2014-11-27 2015-03-11 无锡润地农林科技有限公司 Extensible hydraulic oil cylinder
CN105173736B (en) * 2015-10-12 2018-08-17 航天长征化学工程股份有限公司 Powder pressurizing and conveying device, system and method
CN112780634B (en) * 2021-02-03 2023-08-25 中国人民解放军海军工程大学 Telescopic double-acting hydraulic cylinder
JP7215788B1 (en) * 2022-04-21 2023-01-31 株式会社南武 cylinder type actuator

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE924479C (en) * 1952-10-25 1955-03-03 Toussaint & Hess Gmbh Hydraulic lifting device with parts that can be telescoped into one another
US2829499A (en) * 1956-10-01 1958-04-08 Roper Engineering Company Apparatus for intensifying hydraulic pressure
US3213765A (en) * 1963-09-20 1965-10-26 Parker Hannifin Corp Fluid pressure motor
US3269275A (en) * 1964-07-21 1966-08-30 Soil Mover Company Inc Two stage hydraulic cylinder
FR1478447A (en) * 1966-02-17 1967-04-28 S O F A M A T Soc De Fabricati Multiple fluid cylinder and its application to a molding machine
US3957125A (en) * 1971-09-03 1976-05-18 Russell Jr Wayne B Multi-stage double-acting extendible and contractible shaft drive for drilling device
JPS5321073B2 (en) * 1973-01-31 1978-06-30
DE2626606A1 (en) * 1976-06-14 1977-12-22 Karl Zaengl Pressure cylinder with double action for tyre presses - with its piston acting as cylinder for second piston
SU939849A1 (en) * 1979-09-18 1982-06-30 Предприятие П/Я А-3681 Multistep cylinder
JPS60245811A (en) * 1984-05-17 1985-12-05 Nanbu Tekko:Kk Three-step cylinder
SU1520271A1 (en) * 1985-03-29 1989-11-07 Предприятие П/Я А-3681 Telescopic cylinder
SU1341405A1 (en) * 1985-07-15 1987-09-30 Предприятие П/Я А-3681 Pneudraulic drive
DE3615269A1 (en) * 1986-05-06 1987-11-19 Festo Kg Positioning device
JPS62266383A (en) * 1986-05-10 1987-11-19 石川島播磨重工業株式会社 Dc arc furnace
US4726281A (en) * 1986-06-13 1988-02-23 Quinto De Filippi Hydraulic cylinder
DE3622424A1 (en) * 1986-07-03 1988-01-14 Montan Hydraulik Gmbh & Co Kg TWO-STAGE TELESCOPIC CYLINDER
DE3809461A1 (en) * 1988-03-21 1989-10-12 Mueller Hans Werner Double-stroke cylinder
FR2667550B1 (en) * 1990-10-03 1994-01-28 Hydris ASSEMBLY FOR MOUNTING A LIFT TAILGATE RETRACTABLE PARALLEL TO THE CHASSIS OF A VEHICLE.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9319302A1 *

Also Published As

Publication number Publication date
CN1032713C (en) 1996-09-04
KR100279336B1 (en) 2001-02-01
RU2089757C1 (en) 1997-09-10
WO1993019302A1 (en) 1993-09-30
CN1086588A (en) 1994-05-11
JPH06508424A (en) 1994-09-22
DE4209649C2 (en) 1998-12-24
DE4209649A1 (en) 1993-09-30
TR28546A (en) 1996-10-01

Similar Documents

Publication Publication Date Title
DE102008034582A1 (en) implement
EP0034395B1 (en) Fork-lift truck with extensible forks
DE884174C (en) Truck with load lifting device
DE9308993U1 (en) Telescopic boom
DE202005012049U1 (en) Telescopic sliding beam
DE112005001153T5 (en) electrode column
EP0587848A1 (en) Multistage hydraulic cylinder
DE602004001836T2 (en) Transportable pallet truck
DE202006019421U1 (en) Boom Truck
DE2533055C2 (en) Forge manipulator with parallel spring-loaded tong carrier
EP1346157A2 (en) Device with at least one extension arm or support arm for multi-linked crane shaped extension arms, concrete spreader columns and similar
EP1260478A2 (en) Hydraulic arrangement for the lift cylinder of an industrial truck
DE102005022058A1 (en) Coil tongs for use in lifting tool, has hydraulic main cylinder connected with operating cylinder which is provided for outer and inner clamping jaws, where operating cylinder is pressurized to clamp coil
DE2930316C2 (en) Telescopic mast for forklifts
DE102005041252B4 (en) Electrohydraulic press drive
DE3026861A1 (en) Pneumatic or hydraulic pile driver and extractor appliance - has coaxial holes in hammer plunger and striker head
EP3904270B1 (en) Lifting device and method for extracting a mast or support anchored in a foundation
AT507932B1 (en) HYDRAULIC CYLINDER PISTON UNIT, ESPECIALLY FOR A PRESS
DE3601341A1 (en) Working-cylinder arrangement
DE8212164U1 (en) HYDRAULIC PRESS CYLINDER FOR PIPE PRESSING
DE2115353A1 (en) Hydraulic device for lifting and lowering loads
EP4190740A1 (en) Lifting mast for an industrial truck with two load-carrying means
DE4315823A1 (en) Lifting frame for industrial trucks
DE299226C (en)
DE10145033C2 (en) Press, especially for the production of large forgings

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

17P Request for examination filed

Effective date: 19931216

AK Designated contracting states

Kind code of ref document: A1

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

17Q First examination report despatched

Effective date: 19950523

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

Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED

18R Application refused

Effective date: 19960229