EP3054170B1 - Cylinder-piston unit with adjusting ring - Google Patents
Cylinder-piston unit with adjusting ring Download PDFInfo
- Publication number
- EP3054170B1 EP3054170B1 EP16153866.5A EP16153866A EP3054170B1 EP 3054170 B1 EP3054170 B1 EP 3054170B1 EP 16153866 A EP16153866 A EP 16153866A EP 3054170 B1 EP3054170 B1 EP 3054170B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- lifting
- cylinder
- pressure medium
- reciprocating
- 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.)
- Active
Links
- 230000005540 biological transmission Effects 0.000 claims description 6
- 230000007704 transition Effects 0.000 claims description 5
- 238000009412 basement excavation Methods 0.000 description 10
- 238000007789 sealing Methods 0.000 description 6
- 230000006378 damage Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
Images
Classifications
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- 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
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/26—Locking mechanisms
- F15B15/261—Locking mechanisms using positive interengagement, e.g. balls and grooves, for locking in the end positions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
- B66F3/24—Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
- B66F3/25—Constructional features
- B66F3/30—Constructional features with positive brakes or locks
-
- 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
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/26—Locking mechanisms
-
- 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
- F15B15/1409—Characterised by the construction of the motor unit of the straight-cylinder type with two or more independently movable working pistons
-
- 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
- F15B15/1423—Component parts; Constructional details
- F15B15/1466—Hollow piston sliding over a stationary rod inside the cylinder
-
- 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
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/26—Locking mechanisms
- F15B2015/267—Manual locking or release
-
- 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
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/26—Locking mechanisms
- F15B2015/268—Fluid supply for locking or release independent of actuator pressurisation
-
- 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
- F15B2211/7053—Double-acting output members
-
- 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
- F15B2211/72—Output members, e.g. hydraulic motors or cylinders or control therefor having locking means
-
- 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
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/86—Control during or prevention of abnormal conditions
- F15B2211/863—Control during or prevention of abnormal conditions the abnormal condition being a hydraulic or pneumatic failure
- F15B2211/8636—Circuit failure, e.g. valve or hose failure
-
- 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
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/875—Control measures for coping with failures
- F15B2211/8752—Emergency operation mode, e.g. fail-safe operation mode
Definitions
- the invention relates to a piston-cylinder unit for lifting devices with a cylinder and a reciprocating piston guided in a lifting chamber of the cylinder, which is axially adjustable in a lifting direction with the aid of a pressure medium, with an axial outside of the lifting chamber on the reciprocating piston or on a piston rod connected to the reciprocating piston
- Direction adjustable collar is attached, which can be brought into contact with a stop surface fixed to the cylinder, according to the preamble of claim 1.
- Piston-cylinder units of the type mentioned were about in the CN 202201677 U described and are used in particular for lifting heavy loads.
- the reciprocating piston is moved in an excavation direction with the aid of a pressure medium, for example hydraulic oil.
- a pressure medium for example hydraulic oil.
- the piston-cylinder unit has to remain in an extended position for a long time under high loads.
- a sudden drop in pressure medium for example as a result of a break in the pressure medium circuit, can lead to an undesired and rapid resetting of the piston, which in practice can cause a high risk of injury and material damage. Therefore, an adjusting ring which is adjustable in the axial direction outside the lifting chamber is provided and is fastened to the lifting piston or to a piston rod connected to the lifting piston.
- the adjusting ring can be designed as an adjusting nut that is screwed onto an external thread of the piston or the piston rod.
- the adjusting ring is carried along with the piston or the piston rod in the course of an excavation movement and can be rotated in the extended position of the piston-cylinder unit and thus axially adjusted so that it is brought into contact with a stop surface fixed to the cylinder. If the pressure medium circuit and thus the pressure acting in the direction of excavation against the external load fails, the adjusting ring abutting the stop surface of the cylinder prevents the piston from resetting movement.
- Other lifting devices were in the GB 874404 A , US 4449734 A , FR 2857000 A1 , JP S6430906 A , EP 2 570 679 A1 and the FR 2457402 A1 described.
- the adjusting ring must be loosened again and placed at a sufficient axial distance from the stop surface of the cylinder in order to enable the piston to be completely reset.
- the piston-cylinder unit is put under a heavy load, it may sometimes be difficult to release the adjusting ring due to the frictional engagement with the contact surface.
- Claim 1 relates to a piston-cylinder unit for lifting devices with a cylinder and a lifting piston guided in a lifting chamber of the cylinder, which is axially adjustable in a lifting direction with the aid of a pressure medium, with a piston rod connected to the lifting piston or to a piston rod connected to the lifting piston Outside the lifting chamber is adjustable in the axial direction adjustable collar which can be brought into contact with a stop surface fixed to the cylinder.
- an additional lifting piston is provided on the side of the lifting chamber facing away from the lifting direction, which is adjustable parallel to the lifting direction and is connected to the lifting piston via pressure transmission means, the lifting piston-oriented adjustment path for releasing the frictional engagement between the lifting piston Collar and the stop surface is limited by a stop.
- the lifting piston can be moved in the lifting direction, being connected to the lifting piston via pressure transmission means. A pressurization of the lifting piston is thus transferred to the lifting piston, so that a movement of the lifting piston in the lifting direction also moves the lifting piston in the lifting direction. If the adjusting ring was in contact with the stop surface before the lifting piston was actuated, it is thus lifted off the stop surface.
- the adjustment path of the lifting piston oriented in the lifting direction is limited by a stop. This limitation by means of a stop simplifies, on the one hand, the actuation of the lifting piston and, on the other hand, reliably prevents excessive displacement of the lifting piston.
- the pressure transmission means is preferably the pressure medium in the lifting chamber for the lifting piston itself, which moves the lifting piston in the lifting direction.
- the lifting piston is therefore not in direct contact with the reciprocating piston, but rather pressurizes the pressure medium in the lifting chamber, which pressure is transferred directly to the reciprocating piston due to the incompressibility of the pressure medium normally used.
- This procedure is not only structurally simple to implement, but also has the advantage that the lifting piston and thus the adjusting ring can be raised in any position of the lifting piston with the aid of the lifting piston.
- the lifting piston is preferably guided in a receiving space adjoining the lifting chamber in the axial direction, the stop being formed by a step-shaped transition between the lifting chamber and the receiving space.
- a step-like transition is achieved, for example, by the dimensions of the receiving space projecting beyond those of the lifting chamber at least in sections.
- the lifting piston which is in tight contact in the receiving space, thus strikes the stop in the course of its adjustment path oriented in the direction of excavation and is thus limited in its adjustment path.
- the receiving space preferably has a cylindrical inner wall and is designed coaxially with the lifting chamber, the diameter of the cylindrical inner wall projecting beyond the inner diameter of the lifting chamber. This results in an annular shoulder running concentrically to the lifting piston in the transition area from the lifting chamber to
- the lifting piston is preferably arranged coaxially with the lifting piston, the diameter of the lifting piston being larger than that of the lifting piston.
- a first pressure medium circuit be provided for the lifting piston and a second pressure medium circuit independent of the first pressure medium circuit for the lifting piston.
- Fig. 1 Reference which shows a sectional view through an embodiment of a piston-cylinder unit according to the invention with a cylinder 1 and a piston 2 guided in a lifting chamber of the cylinder 1.
- the reciprocating piston 2 can be moved by a pressure medium, for example a hydraulic oil, in an excavation direction R which is in the Fig. 1 is indicated with an arrow.
- the cylinder 1 is closed on its side facing away from the direction of excavation R by a piston crown 3.
- the pressure medium for the reciprocating piston 2 can be supplied to the lifting chamber via a first connection 11, which is arranged on the cylinder 1 and is part of a first pressure medium circuit.
- the lifting piston 2 is guided during the lifting movement on the one hand by the inner wall of the lifting chamber and on the other hand by a centrally arranged piston guide 4 which is inserted into a central blind bore of the lifting piston 2 and on which the lifting piston 2 is located via a first sealing ring 15 and an end piece 16 the piston guide 4 is slidingly supported.
- An annular free space 9 is formed between the reciprocating piston 2 and the piston guide 4 and extends in the axial direction between the first sealing ring 15 of the reciprocating piston 2 and the end piece 16 of the piston guide 4.
- the supply of the pressure medium via the first connection 11 causes a lifting movement of the lifting piston 2 in the lifting direction R.
- An adjusting ring 5 is also moved
- the embodiment shown is attached to the reciprocating piston 2.
- the collar 5 is in the embodiment of the Fig. 1 designed as an adjusting nut that is screwed onto the reciprocating piston 2.
- an external thread is provided on the reciprocating piston 2, which may be designed as a trapezoidal thread in order to improve the guidance of the reciprocating piston 2 within the reciprocating chamber.
- a pressure cap 6 is also moved, on which the load to be moved rests.
- the pressure cap 6 is fastened to the reciprocating piston 2 by means of a screw 7, the head of the screw 7 being spring-mounted. This allows a slight pivoting of the pressure cap 6 within the concave receptacle on the reciprocating piston 2 and improves the bearing of the load on the pressure cap 6.
- the cylinder 1 according to the embodiment of FIG Fig. 1 also an overstroke limiting connection 8.
- a resetting movement of the reciprocating piston 2 is usually already initiated by reducing the pressure exerted by the first pressure medium circuit, since the resetting movement usually takes place under load on the reciprocating piston 2.
- a resetting pressure medium circuit is also provided in the exemplary embodiment shown, in which pressure medium is supplied to the annular space 9 between the reciprocating piston 2 and the piston guide 4 via a second connection 12 arranged on the piston head 3 via a pressure medium channel 14 running inside the piston guide 4.
- the first sealing ring 15 can be pressurized via the pressure medium of the restoring pressure medium circuit, so that a restoring force is exerted against the lifting direction R on the reciprocating piston 2. Since there is an increasing section of the central blind bore of the lifting piston 2 above the end piece 16 during a lifting movement of the lifting piston 2 and this section is shortened when the lifting piston 2 moves backward, a ventilation channel 17 is provided in the exemplary embodiment shown in order to equalize the pressure in the Allow sections of the central blind bore located above the end piece 16.
- the adjusting ring 5 is carried along with the lifting piston 2 in the course of an excavation movement and thereby moves away from the cylinder 1.
- the adjusting ring 5 can, however, be adjusted axially so that it comes into contact with again is brought to the cylinder 1 fixed stop surface 18, which in the embodiment shown Fig. 1 is formed by an annular end face of the cylinder 1.
- the adjusting ring 5 is designed as an adjusting nut, this axial adjusting movement can take place by turning the adjusting nut until the adjusting nut bears against the stop surface 18. If the pressure medium circuit and thus the pressure acting in the excavation direction R against the external load fails, it is prevented the adjusting ring 5 resting against the stop surface 18 of the cylinder 1 has a restoring movement of the reciprocating piston 2.
- the adjusting ring 5 must be loosened again and brought into a sufficient axial distance from the stop surface 18 of the cylinder 1 in order to enable the reciprocating piston 2 to be completely reset.
- loosening of the adjusting ring 5 can sometimes be difficult due to the frictional engagement with the contact surface 18.
- An additional lifting piston 10 is therefore provided within the cylinder 1 on the side of the lifting chamber facing away from the direction of excavation R.
- the lifting piston 10 is guided in a receiving space adjoining the lifting chamber in the axial direction, which has a cylindrical inner wall and is designed coaxially to the lifting chamber.
- the lifting piston 10 is guided during its adjustment path on the one hand by the cylindrical inner wall of the receiving space and on the other hand by the centrally arranged piston guide 4 which penetrates a central bore of the lifting piston 10 and on which the lifting piston 10 is supported in a sliding manner via a second sealing ring 20.
- the diameter of the cylindrical inner wall of the receiving space for the lifting piston 10 projects beyond the inner diameter of the lifting chamber. This results in an annular shoulder which runs concentrically with the lifting piston 10 in the transition region from the lifting chamber to the receiving space. Since the lifting piston 10 is also arranged coaxially with the lifting piston 2 and its diameter is larger than that of the lifting piston 2, this annular shoulder forms a stop 19 for the lifting piston 10 Fig. 1 can be removed the adjustment of the lifting piston 10 is only very small and greatly limited in the lifting direction R by the stop 19. However, since the lifting piston 10 only serves to release a frictional engagement between the adjusting ring 5 and the stop surface 18, only a small adjustment path of the lifting piston 10 is required.
- the lifting piston 10 can be adjusted parallel to the lifting direction R by providing a second pressure medium circuit that is independent of the first pressure medium circuit.
- a third connection 13 is provided on the piston head 3, via which a pressure medium for the lifting piston 10 can be supplied.
- the lifting piston 10 is connected to the reciprocating piston 2 via pressure transmission means. In the embodiment shown the Fig. 1 it is the pressure medium itself that moves the reciprocating piston 2 in the direction of excavation R.
- the lifting piston 10 is therefore not in direct contact with the reciprocating piston 2, but rather pressurizes the pressure medium in the lifting chamber, which pressure is transferred directly to the reciprocating piston 2 due to the incompressibility of the pressure medium normally used.
- the lifting piston 2 and thus the adjusting ring 5 can be raised in any position of the lifting piston 2 with the aid of the lifting piston 10.
- the slight lifting of the reciprocating piston 2 and thus of the adjusting ring 5 releases the frictional engagement between the adjusting ring 5 and the stop surface 18, so that the adjusting ring 5 can easily be adjusted axially in such a way that it can be spaced apart from the cylinder 1.
- the restoring movement of the reciprocating piston 2 can subsequently be initiated by reducing the pressure in the first pressure medium circuit.
- the Fig. 2 shows a sectional view according to the in Fig. 4 Section plane B shown for the piston-cylinder unit according to Fig. 1
- the Fig. 3 an elevation of a piston-cylinder unit according to the invention to illustrate the cut according to Fig. 1
- the Fig. 4 a plan view of a piston-cylinder unit according to the invention to illustrate the cut according to Fig. 2 .
- the invention thus makes it easier to use the additional lifting piston 10 to release the adjusting ring 5 when the lifting piston 2 is to be reset.
- the additional outlay on control technology for actuating the lifting piston 10 is limited, since the displacement path of the lifting piston 10 is limited in terms of design in a simple manner by the stop 19 .
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
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Description
Die Erfindung betrifft eine Kolben-Zylindereinheit für Hubeinrichtungen mit einem Zylinder und einem in einer Hubkammer des Zylinders geführten Hubkolben, der mithilfe eines Druckmittels in eine Aushubrichtung axial verstellbar ist, wobei am Hubkolben oder an einer mit dem Hubkolben verbundenen Kolbenstange ein außerhalb der Hubkammer in axialer Richtung verstellbarer Stellring befestigt ist, der in Anlage mit einer am Zylinder festgelegten Anschlagfläche bringbar ist, gemäß dem Oberbegriff von Anspruch 1.The invention relates to a piston-cylinder unit for lifting devices with a cylinder and a reciprocating piston guided in a lifting chamber of the cylinder, which is axially adjustable in a lifting direction with the aid of a pressure medium, with an axial outside of the lifting chamber on the reciprocating piston or on a piston rod connected to the reciprocating piston Direction adjustable collar is attached, which can be brought into contact with a stop surface fixed to the cylinder, according to the preamble of
Kolben-Zylindereinheiten der genannten Art wurden etwa in der
Sobald der Kolben der Kolben-Zylindereinheit wieder rückgestellt werden soll, muss der Stellring wieder gelöst und in einen ausreichenden axialen Abstand zur Anschlagfläche des Zylinders gebracht werden, um eine gänzliche Rückstellung des Kolbens zu ermöglichen. Insbesondere bei einer Rückstellung unter starker Belastung der Kolben-Zylindereinheit kann das Lösen des Stellrings aufgrund des Reibschlusses mit der Anlagefläche aber mitunter nur schwer möglich sein.As soon as the piston of the piston-cylinder unit is to be reset, the adjusting ring must be loosened again and placed at a sufficient axial distance from the stop surface of the cylinder in order to enable the piston to be completely reset. In particular, when the piston-cylinder unit is put under a heavy load, it may sometimes be difficult to release the adjusting ring due to the frictional engagement with the contact surface.
Es ist daher das Ziel der Erfindung bei einer gattungsgemäßen Kolben-Zylindereinheit das Lösen des Stellrings bei erwünschter Rückstellung des Kolbens zu erleichtern.It is therefore the object of the invention in a generic piston-cylinder unit to facilitate the loosening of the adjusting ring when the piston is to be reset.
Dieses Ziel wird durch die Merkmale von Anspruch 1 erreicht. Anspruch 1 bezieht sich auf eine Kolben-Zylindereinheit für Hubeinrichtungen mit einem Zylinder und einem in einer Hubkammer des Zylinders geführten Hubkolben, der mithilfe eines Druckmittels in eine Aushubrichtung axial verstellbar ist, wobei am Hubkolben oder an einer mit dem Hubkolben verbundenen Kolbenstange ein außerhalb der Hubkammer in axialer Richtung verstellbarer Stellring befestigt ist, der in Anlage mit einer am Zylinder festgelegten Anschlagfläche bringbar ist. Erfindungsgemäß wird hierbei vorgeschlagen, dass auf der der Aushubrichtung abgewandten Seite der Hubkammer ein zusätzlicher Anhebekolben vorgesehen ist, der parallel zur Aushubrichtung verstellbar ist und mit dem Hubkolben über Druckübertragungsmittel verbunden ist, wobei der in Aushubrichtung orientierte Verstellweg des Anhebekolbens für ein Lösen des Reibschlusses zwischen dem Stellring und der Anschlagfläche-durch einen Anschlag begrenzt ist. Der Anhebekolben kann in Aushubrichtung bewegt werden, wobei er mit dem Hubkolben über Druckübertragungsmittel verbunden ist. Eine Druckbeaufschlagung des Anhebekolbens überträgt sich somit auf den Hubkolben, sodass eine Bewegung des Anhebekolbens in Aushubrichtung auch den Hubkolben in Aushubrichtung bewegt. Falls der Stellring vor der Betätigung des Anhebekolbens in Anlage mit der Anschlagfläche stand, wird er somit von der Anschlagfläche abgehoben. Auf diese Weise wird auch der Reibschluss zur Anschlagfläche gelöst und der Stellring lässt sich leicht bewegen. Allerdings ist für ein Lösen des Reibschlusses lediglich ein geringfügiger Verstellweg des Anhebekolbens erforderlich. Daher wird erfindungsgemäß ferner vorgeschlagen, dass der in Aushubrichtung orientierte Verstellweg des Anhebekolbens durch einen Anschlag begrenzt ist. Diese Begrenzung durch einen Anschlag vereinfacht einerseits die Ansteuerung des Anhebekolbens und vermeidet andererseits zuverlässig zu große Verschiebungen des Hubkolbens.This goal is achieved by the features of
Vorzugsweise handelt es sich bei dem Druckübertragungsmittel um das in der Hubkammer befindliche Druckmittel für den Hubkolben selbst, das den Hubkolben in die Aushubrichtung bewegt. Der Anhebekolben liegt somit nicht direkt am Hubkolben an, sondern beaufschlagt das Druckmittel in der Hubkammer mit Druck, der sich aufgrund der Inkompressibilität der üblicherweise verwendeten Druckmittel unmittelbar auf den Hubkolben überträgt. Diese Vorgangsweise ist nicht nur baulich einfach umzusetzen, sondern hat auch den Vorteil, dass ein Anheben des Hubkolbens und somit des Stellrings mithilfe des Anhebekolbens in jeder Stellung des Hubkolbens bewirkt werden kann.The pressure transmission means is preferably the pressure medium in the lifting chamber for the lifting piston itself, which moves the lifting piston in the lifting direction. The lifting piston is therefore not in direct contact with the reciprocating piston, but rather pressurizes the pressure medium in the lifting chamber, which pressure is transferred directly to the reciprocating piston due to the incompressibility of the pressure medium normally used. This procedure is not only structurally simple to implement, but also has the advantage that the lifting piston and thus the adjusting ring can be raised in any position of the lifting piston with the aid of the lifting piston.
Der Anhebekolben ist vorzugsweise in einem in axialer Richtung an die Hubkammer anschließenden Aufnahmeraum geführt, wobei der Anschlag durch einen stufenförmigen Übergang zwischen der Hubkammer und dem Aufnahmeraum gebildet wird. Ein solcher stufenförmiger Übergang wird etwa erreicht, indem die Abmessungen des Aufnahmeraumes jene der Hubkammer zumindest abschnittsweise überragen. Der im Aufnahmeraum in dichter Anlage geführte Anhebekolben stößt somit im Zuge seines in Aushubrichtung orientierten Verstellweges am Anschlag an und wird somit in seinem Verstellweg begrenzt.The lifting piston is preferably guided in a receiving space adjoining the lifting chamber in the axial direction, the stop being formed by a step-shaped transition between the lifting chamber and the receiving space. Such a step-like transition is achieved, for example, by the dimensions of the receiving space projecting beyond those of the lifting chamber at least in sections. The lifting piston, which is in tight contact in the receiving space, thus strikes the stop in the course of its adjustment path oriented in the direction of excavation and is thus limited in its adjustment path.
Vorzugsweise weist der Aufnahmeraum eine zylindrische Innenwandung auf und ist koaxial zur Hubkammer ausgeführt, wobei der Durchmesser der zylindrischen Innenwandung den inneren Durchmesser der Hubkammer überragt. Somit ergibt sich eine konzentrisch zum Anhebekolben verlaufende Ringschulter im Übergangsbereich von der Hubkammer zumThe receiving space preferably has a cylindrical inner wall and is designed coaxially with the lifting chamber, the diameter of the cylindrical inner wall projecting beyond the inner diameter of the lifting chamber. This results in an annular shoulder running concentrically to the lifting piston in the transition area from the lifting chamber to
Aufnahmeraum, die den Anschlag für den Anhebekolben bildet. Ferner ist der Anhebekolben vorzugsweise koaxial zum Hubkolben angeordnet, wobei der Durchmesser des Anhebekolbens größer ist als jener des Hubkolbens.Recording space that forms the stop for the lifting piston. Furthermore, the lifting piston is preferably arranged coaxially with the lifting piston, the diameter of the lifting piston being larger than that of the lifting piston.
Zur Erhöhung der Betriebssicherheit sowie zur Vereinfachung der Ansteuerung von Hubkolben und Anhebekolben wird außerdem vorgeschlagen, dass für den Hubkolben ein erster Druckmittelkreis vorgesehen ist und für den Anhebekolben ein zweiter, vom ersten Druckmittelkreis unabhängiger Druckmittelkreis.In order to increase operational safety and to simplify the actuation of reciprocating pistons and lifting pistons, it is also proposed that a first pressure medium circuit be provided for the lifting piston and a second pressure medium circuit independent of the first pressure medium circuit for the lifting piston.
Die Erfindung wird in weiterer Folge anhand eines Ausführungsbeispiels mithilfe der beiliegenden Zeichnungen näher erläutert. Es zeigen hierbei die
-
Fig. 1 eine Schnittdarstellung gemäß der inFig. 3 gezeigten Schnittebene A für eine Ausführungsform einer erfindungsgemäßen Kolben-Zylindereinheit, -
Fig. 2 eine Schnittdarstellung gemäß der inFig. 4 gezeigten Schnittebene B für die Kolben-Zylindereinheit gemäßFig. 1 , -
Fig. 3 einen Aufriss einer erfindungsgemäßen Kolben-Zylindereinheit zur Illustration der Schnittführung gemäßFig. 1 , und die -
Fig. 4 einen Grundriss einer erfindungsgemäßen Kolben-Zylindereinheit zur Illustration der Schnittführung gemäßFig. 2 .
-
Fig. 1 a sectional view according to the inFig. 3 sectional plane A shown for an embodiment of a piston-cylinder unit according to the invention, -
Fig. 2 a sectional view according to the inFig. 4 Section plane B shown for the piston-cylinder unit according toFig. 1 , -
Fig. 3 an elevation of a piston-cylinder unit according to the invention to illustrate the cut according toFig. 1 , and the -
Fig. 4 a plan view of a piston-cylinder unit according to the invention to illustrate the cut according toFig. 2 .
Zunächst wird auf die
Das Druckmittel für den Hubkolben 2 kann über einen ersten Anschluss 11 der Hubkammer zugeführt werden, der am Zylinder 1 angeordnet ist und Teil eines ersten Druckmittelkreises ist. Der Hubkolben 2 wird während der Aushubbewegung einerseits von der inneren Wand der Hubkammer geführt und andererseits von einer zentral angeordneten Kolbenführung 4, die in eine zentrale Sackbohrung des Hubkolbens 2 eingesetzt ist und an der sich der Hubkolben 2 über einen ersten Dichtring 15 sowie ein Endstück 16 der Kolbenführung 4 gleitend abstützt. Zwischen dem Hubkolben 2 und der Kolbenführung 4 ist ein ringförmiger Freiraum 9 ausgebildet, der sich in axialer Richtung zwischen dem ersten Dichtring 15 des Hubkolbens 2 und dem Endstück 16 der Kolbenführung 4 erstreckt.The pressure medium for the reciprocating
Die Zufuhr des Druckmittels über den ersten Anschluss 11 bewirkt eine Aushubbewegung des Hubkolbens 2 in die Aushubrichtung R. Dabei wird ein Stellring 5 mit bewegt, der im gezeigten Ausführungsbeispiel am Hubkolben 2 befestigt ist. Der Stellring 5 ist im Ausführungsbeispiel der
Eine rückstellende Bewegung des Hubkolbens 2 wird in der Regel bereits durch Reduktion des durch den ersten Druckmittelkreis ausgeübten Drucks eingeleitet, da die rückstellende Bewegung zumeist unter Belastung des Hubkolbens 2 erfolgt. Bei einer rückstellenden Bewegung ohne axiale Belastung des Hubkolbens 2 oder bei nur geringer Belastung könnte der Reibschluss zwischen dem Hubkolben 2 und der inneren Wand der Hubkammer eine Rückstellung des Hubkolbens 2 erschweren oder sogar unterbinden. Daher ist im gezeigten Ausführungsbeispiel auch ein rückstellender Druckmittelkreis vorgesehen, bei dem über einen am Kolbenboden 3 angeordneten zweiten Anschluss 12 Druckmittel über einen innerhalb der Kolbenführung 4 verlaufenden Druckmittelkanal 14 dem ringförmigen Freiraum 9 zwischen Hubkolben 2 und der Kolbenführung 4 zugeführt wird. Über das Druckmittel des rückstellenden Druckmittelkreises kann der erste Dichtring 15 mit Druck beaufschlagt werden, sodass auf den Hubkolben 2 eine rückstellende Kraft entgegen der Aushubrichtung R ausgeübt wird. Da sich bei einer Aushubbewegung des Hubkolbens 2 ein zunehmender Abschnitt der zentralen Sackbohrung des Hubkolbens 2 oberhalb des Endstückes 16 befindet und bei einer rückstellenden Bewegung des Hubkolbens 2 sich dieser Abschnitt wieder verkürzt, ist im gezeigten Ausführungsbeispiel ein Belüftungskanal 17 vorgesehen, um einen Druckausgleich in den oberhalb des Endstückes 16 befindlichen Abschnitten der zentralen Sackbohrung zu ermöglichen.A resetting movement of the reciprocating
Wie bereits erwähnt wurde, wird der Stellring 5 im Zuge einer Aushubbewegung mit dem Hubkolben 2 mitgeführt und entfernt sich dadurch zunehmend vom Zylinder 1. In ausgeschobener Stellung der Kolben-Zylindereinheit kann der Stellring 5 aber axial so verstellt werden, dass er wieder in Anlage mit einer am Zylinder 1 festgelegten Anschlagfläche 18 gebracht wird, die im gezeigten Ausführungsbeispiel der
Sobald der Hubkolben 2 der Kolben-Zylindereinheit wieder rückgestellt werden soll, muss der Stellring 5 wieder gelöst und in einen ausreichenden axialen Abstand zur Anschlagfläche 18 des Zylinders 1 gebracht werden, um eine gänzliche Rückstellung des Hubkolbens 2 zu ermöglichen. Insbesondere bei einer Rückstellung unter starker Belastung der Kolben-Zylindereinheit kann das Lösen des Stellrings 5 aufgrund des Reibschlusses mit der Anlagefläche 18 aber mitunter nur schwer möglich sein.As soon as the
Daher ist innerhalb des Zylinders 1 auf der der Aushubrichtung R abgewandten Seite der Hubkammer ein zusätzlicher Anhebekolben 10 vorgesehen. Der Anhebekolben 10 ist in einem in axialer Richtung an die Hubkammer anschließenden Aufnahmeraum geführt, der eine zylindrische Innenwandung aufweist und koaxial zur Hubkammer ausgeführt ist. Der Anhebekolben 10 wird während seines Verstellweges einerseits von der zylindrischen Innenwandung des Aufnahmeraumes geführt und andererseits von der zentral angeordneten Kolbenführung 4, die eine zentrale Bohrung des Anhebekolbens 10 durchsetzt und an der sich der Anhebekolben 10 über einen zweiten Dichtring 20 gleitend abstützt.An
Der Durchmesser der zylindrischen Innenwandung des Aufnahmeraums für den Anhebekolben 10 überragt den inneren Durchmesser der Hubkammer. Dadurch ergibt sich eine konzentrisch zum Anhebekolben 10 verlaufende Ringschulter im Übergangsbereich von der Hubkammer zum Aufnahmeraum. Da auch der Anhebekolben 10 koaxial zum Hubkolben 2 angeordnet ist und dessen Durchmesser größer ist als jener des Hubkolbens 2, bildet diese Ringschulter einen Anschlag 19 für den Anhebekolben 10. Wie der
Der Anhebekolben 10 ist parallel zur Aushubrichtung R verstellbar, indem ein zweiter, vom ersten Druckmittelkreis unabhängiger Druckmittelkreis vorgesehen ist. Hierfür ist am Kolbenboden 3 ein dritter Anschluss 13 vorgesehen, über den ein Druckmittel für den Anhebekolben 10 zugeführt werden kann. Der Anhebekolben 10 ist dabei mit dem Hubkolben 2 über Druckübertragungsmittel verbunden. Im gezeigten Ausführungsbeispiel der
Die
Die Erfindung erleichtert somit mithilfe des zusätzlichen Anhebekolbens 10 das Lösen des Stellrings 5 bei erwünschter Rückstellung des Hubkolbens 2. Dabei ist der zusätzliche steuerungstechnische Aufwand zur Ansteuerung des Anhebekolbens 10 begrenzt, da der Verstellweg des Anhebekolbens 10 durch den Anschlag 19 auf einfache Weise konstruktiv begrenzt ist.The invention thus makes it easier to use the
- 11
- Zylindercylinder
- 22nd
- HubkolbenReciprocating piston
- 33rd
- KolbenbodenPiston crown
- 44th
- KolbenführungPiston guide
- 55
- StellringCollar
- 66
- DruckkalottePressure cap
- 77
- Schraubescrew
- 88th
- ÜberhubbegrenzungsanschlussOver travel limit connection
- 99
- ringförmiger Freiraumring-shaped free space
- 1010th
- AnhebekolbenLifting piston
- 1111
- erster Anschlussfirst connection
- 1212
- zweiter Anschlusssecond connection
- 1313
- dritter Anschlussthird connection
- 1414
- DruckmittelkanalPressure medium channel
- 1515
- erster Dichtringfirst sealing ring
- 1616
- EndstückTail
- 1717th
- BelüftungskanalVentilation duct
- 1818th
- AnschlagflächeAbutment surface
- 1919th
- Anschlagattack
- 2020th
- zweiter Dichtringsecond sealing ring
Claims (6)
- Piston-cylinder unit for lifting devices, having a cylinder (1) and a reciprocating piston (2) which is guided in a lifting chamber of the cylinder (1) and which is axially adjustable in a lift-out direction (R) with the aid of a pressure medium, wherein an adjusting ring (5) which is adjustable in the axial direction outside the lifting chamber and which can be brought into contact with a stop face (18) fixed to the cylinder (1) is secured to the reciprocating piston (2) or to a piston rod connected to the reciprocating piston (2), characterized in that an additional lifting piston (10) is provided on the side of the lifting chamber facing away from the lift-out direction (R), which lifting piston (10) is adjustable parallel to the lift-out direction (R) and is connected to the reciprocating piston (2) via pressure transmission means, wherein the adjustment path of the lifting piston (10) oriented in the lift-out direction (R) is limited by a stop (19) for releasing a frictional connection between the adjusting ring (5) and the stop surface (18).
- Piston-cylinder unit according to claim 1, characterized in that the pressure transmission means is the pressure medium for the reciprocating piston (2) located in the lifting chamber.
- Piston-cylinder unit according to claim 1 or 2, characterized in that the lifting piston (10) is guided in a receiving space adjoining the lifting chamber in the axial direction, wherein the stop (19) is formed by a step-shaped transition between the lifting chamber and the receiving space.
- Piston-cylinder unit according to claim 3, characterized in that the receiving space has a cylindrical inner wall and is designed coaxially to the lifting chamber, wherein the diameter of the cylindrical inner wall projects beyond the inner diameter of the lifting chamber.
- Piston-cylinder unit according to one of claims 1 to 4, characterized in that the lifting piston (10) is arranged coaxially to the reciprocating piston (2), and the diameter of the lifting piston (10) is larger than that of the reciprocating piston (2).
- Piston-cylinder unit according to one of claims 1 to 5, characterized in that a first pressure medium circuit is provided for the reciprocating piston (2) and a second pressure medium circuit independent of the first pressure medium circuit is provided for the lifting piston (10).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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ATA50096/2015A AT516280B1 (en) | 2015-02-06 | 2015-02-06 | Piston-cylinder unit with adjusting ring |
Publications (2)
Publication Number | Publication Date |
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EP3054170A1 EP3054170A1 (en) | 2016-08-10 |
EP3054170B1 true EP3054170B1 (en) | 2020-06-17 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP16153866.5A Active EP3054170B1 (en) | 2015-02-06 | 2016-02-02 | Cylinder-piston unit with adjusting ring |
Country Status (3)
Country | Link |
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EP (1) | EP3054170B1 (en) |
AT (1) | AT516280B1 (en) |
DK (1) | DK3054170T3 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN106044615A (en) * | 2016-07-27 | 2016-10-26 | 泸州合成液压件有限公司 | Mechanical lock double-acting jack |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB874404A (en) * | 1959-03-11 | 1961-08-10 | Pynford Ltd | Improvements in or relating to jacking devices |
DE2920423A1 (en) * | 1979-05-19 | 1980-11-27 | Stabilus Gmbh | COMPRESSED AIR CYLINDER WITH LOCKING DEVICE |
US4449734A (en) * | 1982-07-07 | 1984-05-22 | Hydra-Jack, Inc. | Mechanical locking outrigger hydraulic jack for an outrigger assembly |
JPS6430906A (en) | 1987-07-23 | 1989-02-01 | Kazuo Ishikawa | Self-lock device for fluid hydraulic cylinder |
JPH03906A (en) * | 1989-05-26 | 1991-01-07 | Kawasaki Heavy Ind Ltd | Feed water preheating method and device in steam generating plant |
FR2717866B1 (en) * | 1994-03-23 | 1996-06-07 | Etu Distr Mat Specif Indl Cent | Pressure fluid cylinder having, in addition to a full stroke, an adjustable approach stroke. |
JP3165419B1 (en) * | 1999-12-10 | 2001-05-14 | エスエムシー株式会社 | Dual stroke cylinder |
FR2857000B1 (en) * | 2003-07-02 | 2007-02-02 | Rezabal Luis Idarreta | SAFETY NUT SIMULTANEOUSLY ADVANCING WITH THE CYLINDER ROD INCORPORATING IT |
ES2429341T3 (en) * | 2009-04-09 | 2013-11-14 | Neumeister Hydraulik Gmbh | Piston and cylinder unit with lock and procedure for locking and unlocking a piston and cylinder unit |
CN202201677U (en) * | 2011-08-24 | 2012-04-25 | 宁波赛维思机械有限公司 | Difunctional mechanically self-locking jack |
-
2015
- 2015-02-06 AT ATA50096/2015A patent/AT516280B1/en active
-
2016
- 2016-02-02 EP EP16153866.5A patent/EP3054170B1/en active Active
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DK3054170T3 (en) | 2020-09-14 |
AT516280B1 (en) | 2016-04-15 |
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EP3054170A1 (en) | 2016-08-10 |
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