EP1076778B1 - Device for the stroke-dependent adjustment of the force generated by a piston - Google Patents
Device for the stroke-dependent adjustment of the force generated by a piston Download PDFInfo
- Publication number
- EP1076778B1 EP1076778B1 EP99948561A EP99948561A EP1076778B1 EP 1076778 B1 EP1076778 B1 EP 1076778B1 EP 99948561 A EP99948561 A EP 99948561A EP 99948561 A EP99948561 A EP 99948561A EP 1076778 B1 EP1076778 B1 EP 1076778B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylinder
- chamber
- piston
- force generated
- counterpressure
- 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
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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
- 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
- F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
- F15B11/046—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed depending on the position of the working member
- F15B11/048—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed depending on the position of the working member with deceleration control
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30505—Non-return valves, i.e. check valves
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/3056—Assemblies of multiple valves
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/31—Directional control characterised by the positions of the valve element
- F15B2211/3105—Neutral or centre positions
- F15B2211/3111—Neutral or centre positions the pump port being closed in the centre position, e.g. so-called closed centre
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/31—Directional control characterised by the positions of the valve element
- F15B2211/3138—Directional control characterised by the positions of the valve element the positions being discrete
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
- F15B2211/31523—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source and an output member
- F15B2211/31541—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source and an output member having a single pressure source and multiple output members
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/405—Flow control characterised by the type of flow control means or valve
- F15B2211/40576—Assemblies of multiple valves
- F15B2211/40584—Assemblies of multiple valves the flow control means arranged in parallel with a check valve
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
- F15B2211/41527—Flow control characterised by the connections of the flow control means in the circuit being connected to an output member and a directional control valve
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/455—Control of flow in the feed line, i.e. meter-in control
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/47—Flow control in one direction only
- F15B2211/473—Flow control in one direction only without restriction in the reverse direction
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/505—Pressure control characterised by the type of pressure control means
- F15B2211/50554—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure downstream of the pressure control means, e.g. pressure reducing valve
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/505—Pressure control characterised by the type of pressure control means
- F15B2211/50563—Pressure control characterised by the type of pressure control means the pressure control means controlling a differential pressure
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
-
- 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
- F15B2211/50—Pressure control
- F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
- F15B2211/5158—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and an output member
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/565—Control of a downstream pressure
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
- F15B2211/7107—Multiple output members, e.g. multiple hydraulic motors or cylinders the output members being mechanically linked
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/76—Control of force or torque of the output member
Definitions
- the invention relates to a method and an apparatus for path-dependent control of those generated by a first piston Force that runs in a first cylinder that passes through the first piston divided into a first and a second chamber , whereby a pressure fluid is fed into the first chamber.
- a second cylinder is also provided, in which a second piston runs and the second piston also is divided into a first and a second chamber.
- a similarly constructed system is known from DE-A-44 41 098, that acts as a power-assisted actuator.
- the fluid pressure is generated by a master cylinder and the first chamber of a slave cylinder and the first chamber of a cylinder fed to a translation unit.
- the System works hydraulically and the slave cylinder and the Cylinders of the translation unit are graduated, the second chambers each have the larger diameter.
- at Existing external power supply is the translation unit held at rest since the one generated by the master cylinder Pressure is insufficient to move the piston of the translation unit against the pressure of the external power supply acting in its second chamber to postpone. If there is no external power supply this counterforce is eliminated and the piston is displaced, which reduces the size of the second chamber.
- the thereby pressure built up at the point of entry of the external force is passed into the second chamber of the slave cylinder and thereby supports this.
- DE-A-1 576 181 describes a method and an apparatus the features of the preamble of claims 1 and 4 known. It is a hydraulic feed device for loading various parts of a machine tool, at the two double-acting cylinders are mechanically coupled.
- the extension speed of the pistons can be adjusted by valves can be controlled by the pressure fluid either only in one Chamber one of the two cylinders or in the respective on the chambers of both cylinders lying on the same side of the pistons is initiated. If the pressure fluid is only in one chamber of the two cylinders introduced, so are the other chamber this cylinder and the two chambers of the other cylinder with each other and with the speed control trigger of the pressure fluid connected.
- the invention as set out in claims 1 and 4 is based on the task generated by a piston Force in the simplest possible way depending on the To control the travel path of the piston.
- the two pistons are coupled so that the second piston of is dragged along with the first piston and the second chamber of the first cylinder is with the first chamber of the second Cylinder connected so that the same in both chambers There is pressure.
- the fluid from the second chamber of the first cylinder to the first Chamber of the second cylinder moved.
- the two pistons move synchronously, so that at one Extending the reduction of the second chamber of the first cylinder with an enlargement of the first chamber of the second cylinder goes hand in hand.
- the diameter of the second cylinder made larger than that of the first cylinder, so increases with an extension movement of the first Piston the total volume of the second chamber of the first Cylinder and the first chamber of the second cylinder so that the back pressure drops and that generated by the first cylinder Force continuously when extending the first piston depending on the distance increases.
- the force generated by the first piston is one largely continuous and linear function of its extension path.
- the pressure in the second chamber of the second cylinder becomes like this regulated that it is always equal to the back pressure, i.e. the Pressure in the first chamber of the second cylinder and in the second chamber of the first cylinder.
- the two cylinder / piston units can be used with standard cylinders be a piston and have the two chambers of each cylinder same diameter.
- the coupling of the two pistons is expedient mechanical and form-fitting.
- the initial back pressure value is the first Adjustable cylinder, for which the second chamber via a Regulator on which the initial value of the back pressure can be set is connected to the source of pressure fluid.
- the pressurized fluid is preferably a pressurized gas, in particular Compressed air, being the source of the pressurized fluid, the pressurized gas or compressed air is the only energy source in the system.
- the invention is applicable, for example, to a device for dispensing viscous masses in aluminum cartridges with a wavy surface are included.
- the viscous mass it can be an adhesive, for example. at the cartridge is compressed to dispense the mass.
- the cartridge can be placed in an output device be inserted into it by the first piston is applied to the device according to the invention.
- a first or Output cylinder 10 and a second or control cylinder 20 in parallel arranged side by side.
- the output cylinder 10 runs a first or output piston 12 with a piston rod 14, the output cylinder 10 in a first chamber 16 and divides a second chamber 18, the second chamber 18 is on the side of the piston rod 14.
- the control cylinder 20 runs in a corresponding manner second or control piston 22 with a piston rod 24, the the control cylinder 20 into a first chamber 26 and a second Chamber 28 divided, with the second chamber 28 on the side the piston rod 24 is located.
- the two piston rods 14, 24 are outside the cylinder 10, 20 mechanically positively by means of an indicated connection 30 coupled so that they only move synchronously can.
- Compressed air from a compressed air source serves as the pressurized fluid 32 via a shut-off valve 34, a manually operated slide 36 with three positions and a throttle 38 by means of a line 40 passed into the first chamber 16 of the dispensing cylinder 10 becomes.
- the extension speed is by means of the throttle 38 of the output piston 12 adjustable.
- a parallel one Check valve 56 is used to quickly vent the first Chamber 16 of the discharge cylinder 10.
- the shut-off valve 34 and the slide 36 are shown in Fig. 1 in their locked position. To pass the pressure fluid, both are shifted so that a connection between the connections 1 and 2 or 1 and 4 exists.
- the second chamber is via a second line 42 18 of the dispensing cylinder 10 with the first chamber 26 of the Control cylinder 20 connected.
- the initial value of these two chambers 18, 26 and the second line 42 prevailing Back pressure can be a second shut-off valve 44 and Back pressure regulator 46 can be set by means of a third line 48 connected to the terminal 2 of the slide 36 and by adjusting the slide accordingly 36 can be connected to the compressed air source 32.
- a third line 48 is located between the back pressure regulator 46 and the connection 2 of the slide 36 a check valve 50, the compressed air only from the compressed air source 32 to the back pressure regulator 46 passes.
- connection 2 with the second chamber 28 of the control cylinder 20 By means of a linear regulator 52, the connection 2 with the second chamber 28 of the control cylinder 20, the control signal connection 4 with the second line 42 and its connection 1 via a check valve 54 and the shut-off valve 34 with the Compressed air source 32 is connected and its connection 3 free is, the pressure in the second chamber 28 of the control cylinder 20 regulated so that it is equal to the pressure in the first Chamber 26 of the control cylinder 20 and thus equal to the back pressure in the output cylinder 10.
- the first shut-off valve 34 is in its Brought forward position.
- the slide 36 is set so that a connection between the connections 1 and 2 there is, so that the back pressure on the back pressure regulator 46 and the second shut-off valve 44, which is in its pass-through position stands, can build, e.g. to 2 bar.
- In this position becomes the first chamber 16 of the dispensing cylinder 10 via a check valve lying parallel to the throttle 38 56 and the connection between the terminals 4 and 3 of the Slider 36 vented.
- the two pistons 12, 22 thereby move back to their starting position, in which the volumes of the first chambers 16, 26 minimal and those of the second chambers 18, 28 are maximum.
- the first shut-off valve 34 is used to vent the device brought into its locked position, the slide 36 in the position, in which the connections 1 and 2 or 3 and 4 are connected are, so that the first line 40 is vented.
- the second Line 42 is aerated, the piston rods 14 and 24th retracted and the chambers 18, 26 and 28 with the regulated Initial value of the back pressure, e.g. 2 bar filled. Will if necessary the second shut-off valve 44 in its venting position brought, the second line 42 is vented.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
- Steering Control In Accordance With Driving Conditions (AREA)
- Actuator (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum wegabhängigen Steuern der von einem ersten Kolben erzeugten Kraft, der in einem ersten Zylinder läuft, der durch den ersten Kolben in eine erste und eine zweite Kammer unterteilt wird, wobei ein Druckfluid in die erste Kammer geleitet wird. Es ist ferner ein zweiter Zylinder vorgesehen, in dem ein zweiter Kolben läuft und der durch den zweiten Kolben ebenfalls in eine erste und eine zweite Kammer unterteilt wird.The invention relates to a method and an apparatus for path-dependent control of those generated by a first piston Force that runs in a first cylinder that passes through the first piston divided into a first and a second chamber , whereby a pressure fluid is fed into the first chamber. A second cylinder is also provided, in which a second piston runs and the second piston also is divided into a first and a second chamber.
Aus DE-A-44 41 098 ist ein ähnlich aufgebautes System bekannt, das als fremdkraftunterstützte Betätigungsvorrichtung wirkt. Der Fluiddruck wird von einem Geberzylinder erzeugt und der ersten Kammer eines Nehmerzylinders und der ersten Kammer eines Zylinders einer Übersetzungseinheit zugeführt. Das System arbeitet hydraulisch und der Nehmerzylinder und der Zylinder der Übersetzungseinheit sind abgestuft, wobei die zweiten Kammern jeweils den größeren Durchmesser haben. Bei bestehender Fremdkraftversorgung ist die Übersetzungseinheit in Ruhestellung gehalten, da der vom Geberzylinder erzeugte Druck nicht ausreicht, um den Kolben der Übersetzungseinheit gegen den in ihrer zweiten Kammer wirkenden Druck der Fremdkraftversorgung zu verschieben. Bei fehlender Fremdkraftversorgung entfällt diese Gegenkraft und der Kolben wird verschoben, wodurch die zweite Kammer verkleinert wird. Der dadurch am Einspeisungspunkt der Fremdkraft aufgebaute Druck wird in die zweite Kammer des Nehmerzylinders geleitet und unterstützt diesen dadurch. A similarly constructed system is known from DE-A-44 41 098, that acts as a power-assisted actuator. The fluid pressure is generated by a master cylinder and the first chamber of a slave cylinder and the first chamber of a cylinder fed to a translation unit. The System works hydraulically and the slave cylinder and the Cylinders of the translation unit are graduated, the second chambers each have the larger diameter. at Existing external power supply is the translation unit held at rest since the one generated by the master cylinder Pressure is insufficient to move the piston of the translation unit against the pressure of the external power supply acting in its second chamber to postpone. If there is no external power supply this counterforce is eliminated and the piston is displaced, which reduces the size of the second chamber. The thereby pressure built up at the point of entry of the external force is passed into the second chamber of the slave cylinder and thereby supports this.
Aus DE-A-1 576 181 ist ein Verfahren und eine Vorrichtung mit
den Merkmalen des Oberbegriffs der Ansprüche 1 bzw. 4 bekannt.
Es handelt sich hierbei um eine hydraulische Speisevorrichtung
zum Beschicken verschiedener Teile einer Werkzeugmaschine, bei
der zwei doppelwirkende Zylinder mechanisch gekoppelt sind.
Durch Ventile kann die Ausfahrgeschwindigkeit der Kolben
gesteuert werden, indem das Druckfluid entweder nur in eine
Kammer eines der beiden Zylinder oder in die jeweils auf der
gleichen Seite der Kolben liegende Kammern beider Zylinder
eingeleitet wird. Wird das Druckfluid nur in eine Kammer eines
der beiden Zylinder eingeleitete, so sind die andere Kammer
dieses Zylinders und die beiden Kammern des anderen Zylinders
miteinander und mit dem die Geschwindigkeit steuernden Abzug
des Druckfluids verbunden.DE-A-1 576 181 describes a method and an apparatus
the features of the preamble of
Der Erfindung, wie sie in den Ansprüchen 1 und 4 angegeben
ist, liegt die Aufgabe zugrunde die von einem Kolben erzeugte
Kraft auf möglichst einfache Weise in Abhängigkeit von dem
Fahrweg des Kolbens zu steuern.The invention as set out in
Die beiden Kolben sind gekoppelt, so daß der zweite Kolben von dem ersten Kolben mitgeschleppt wird, und die zweite Kammer des ersten Zylinders ist mit der ersten Kammer des zweiten Zylinders verbunden, so daß in beiden Kammern der gleiche Druck herrscht.The two pistons are coupled so that the second piston of is dragged along with the first piston and the second chamber of the first cylinder is with the first chamber of the second Cylinder connected so that the same in both chambers There is pressure.
Bei einer Ausfahrbewegung des ersten Kolbens wird das Fluid aus der zweiten Kammer des ersten Zylinders in die erste Kammer des zweiten Zylinders verschoben. Durch die Koppelung der beiden Kolben bewegen sie sich synchron, so daß bei einer Ausfahrbewegung die Verkleinerung der zweiten Kammer des ersten Zylinders mit einer Vergrößerung der ersten Kammer des zweiten Zylinders einhergeht. Wird nun der Durchmesser des zweiten Zylinders größer gemacht als der des ersten Zylinders, so vergrößert sich bei einer Ausfahrbewegung des ersten Kolbens das Gesamtvolumen der zweiten Kammer des ersten Zylinders und der ersten Kammer des zweiten Zylinders, so daß der Gegendruck sinkt und die von dem ersten Zylinder erzeugte Kraft beim Ausfahren des ersten Kolbens wegabhängig kontinuierlich zunimmt.When the first piston extends, the fluid from the second chamber of the first cylinder to the first Chamber of the second cylinder moved. Through the coupling of the two pistons they move synchronously, so that at one Extending the reduction of the second chamber of the first cylinder with an enlargement of the first chamber of the second cylinder goes hand in hand. If the diameter of the second cylinder made larger than that of the first cylinder, so increases with an extension movement of the first Piston the total volume of the second chamber of the first Cylinder and the first chamber of the second cylinder so that the back pressure drops and that generated by the first cylinder Force continuously when extending the first piston depending on the distance increases.
Hat der zweite Zylinder dagegen einen kleineren Durchmesser, so sinkt die von dem ersten Zylinder erzeugte Kraft bei einer Ausfahrbewegung kontinuierlich.If the second cylinder has a smaller diameter, so the force generated by the first cylinder drops at one Extending movement continuously.
In jedem Fall ist die von dem ersten Kolben erzeugt Kraft eine weitgehend stetige und lineare Funktion seines Ausfahrweges.In any case, the force generated by the first piston is one largely continuous and linear function of its extension path.
Der Druck in der zweiten Kammer des zweiten Zylinders wird so geregelt, daß er stets gleich dem Gegendruck ist, d.h. dem Druck in der ersten Kammer des zweiten Zylinders und in der zweiten Kammer des ersten Zylinders.The pressure in the second chamber of the second cylinder becomes like this regulated that it is always equal to the back pressure, i.e. the Pressure in the first chamber of the second cylinder and in the second chamber of the first cylinder.
Die beiden Zylinder/Kolben-Einheiten können Normzylinder mit einem Kolben sein und die beiden Kammern jedes Zylinders haben gleichen Durchmesser. Die Koppelung der beiden Kolben ist zweckmäßig mechanisch und formschlüssig. The two cylinder / piston units can be used with standard cylinders be a piston and have the two chambers of each cylinder same diameter. The coupling of the two pistons is expedient mechanical and form-fitting.
Vorzugsweise ist der Anfangswert des Gegendrucks des ersten Zylinders einstellbar, wozu dessen zweite Kammer über einen Regler, an dem der Anfangswert des Gegendrucks einstellbar ist, mit der Quelle für Druckfluid verbindbar ist.Preferably the initial back pressure value is the first Adjustable cylinder, for which the second chamber via a Regulator on which the initial value of the back pressure can be set is connected to the source of pressure fluid.
Das Druckfluid ist vorzugsweise ein Druckgas, insbesonder Druckluft, wobei die Quelle für das Druckfluid, das Druckgas oder die Druckluft die einzige Energiequelle des.Systems ist.The pressurized fluid is preferably a pressurized gas, in particular Compressed air, being the source of the pressurized fluid, the pressurized gas or compressed air is the only energy source in the system.
Die Erfindung ist beispielsweise anwendbar für eine Vorrichtung zur Ausgabe viskoser Massen, die in Aluminium-Kartuschen mit welliger Oberfläche enthalten sind. Bei der viskosen Masse kann es sich beispielsweise um einen Klebstoff handeln. Bei der Ausgabe der Masse wird die Kartusche zusammengedrückt. Die dafür erforderliche Kraft ist um so größer, je weiter die Kartusche bereits zusammengedrückt ist. Um die viskose Masse mit zeitlich konstantem Volumenstrom auszugeben, ist es daher notwendig, die auf die Kartusche ausgeübte Kraft in Abhängigkeit von der Rest-Größe der Kartusche zu steuern, und zwar ansteigen zu lassen. Die Kartusche kann dazu in eine Ausgabevorrichtung eingelegt werden, in der sie durch den ersten Kolben der erfindungsgemäßen Vorrichtung beaufschlagt wird.The invention is applicable, for example, to a device for dispensing viscous masses in aluminum cartridges with a wavy surface are included. With the viscous mass it can be an adhesive, for example. at the cartridge is compressed to dispense the mass. The the further the cartridge, the greater the force required is already compressed. To the viscous mass with output constant volume flow over time, it is therefore necessary the force exerted on the cartridge depending to control the remaining size of the cartridge, and increase allow. For this purpose, the cartridge can be placed in an output device be inserted into it by the first piston is applied to the device according to the invention.
Ein Ausführungsbeispiel der Erfindung wird nachfolgend anhand der Zeichnung erläutert, wobei
- Fig. 1
- ein Schaltbild der Drucksteuerung zeigt.
- Fig. 1
- shows a circuit diagram of the pressure control.
In dem dargestellten Ausführungsbeispiel sind ein erster oder
Ausgabezylinder 10 und ein zweiter oder Steuerzylinder 20 parallel
nebeneinander angeordnet. In dem Ausgabezylinder 10
läuft ein erster oder Ausgabekolben 12 mit einer Kolbenstange
14, der den Ausgabezylinder 10 in eine erste Kammer 16 und
eine zweite Kammer 18 unterteilt, wobei die zweite Kammer 18
auf der Seite der Kolbenstange 14 liegt. In the illustrated embodiment, a first or
In entsprechender Weise läuft in dem Steuerzylinder 20 ein
zweiter oder Steuerkolben 22 mit einer Kolbenstange 24, der
den Steuerzylinder 20 in eine erste Kammer 26 und eine zweite
Kammer 28 unterteilt, wobei die zweite Kammer 28 auf der Seite
der Kolbenstange 24 liegt.The
Die beiden Kolbenstangen 14, 24 sind außerhalb der Zylinder
10, 20 durch eine angedeutete Verbindung 30 mechanisch formschlüssig
gekoppelt, so daß sie sich nur synchron bewegen
können.The two
Als Druckfluid dient Druckluft, die von einer Druckluftquelle
32 über ein Absperrventil 34, einen handbetätigten Schieber 36
mit drei Stellungen und eine Drossel 38 mittels einer Leitung
40 in die erste Kammer 16 des Ausgabezylinders 10 geleitet
wird. Mittels der Drossel 38 ist die Ausfahrgeschwindigkeit
des Ausgabekolbens 12 einstellbar. Ein parallel liegendes
Rückschlagventil 56 dient zum schnellen Entlüften der ersten
Kammer 16 des Ausgabezylinders 10. Das Absperrventil 34 und
der Schieber 36 sind in Fig. 1 in ihrer Sperrstellung gezeigt.
Zur Durchleitung des Druckfluids werden beide so verschoben,
daß eine Verbindung zwischen den Anschlüssen 1 und 2 bzw. 1
und 4 besteht. Über eine zweite Leitung 42 ist die zweite Kammer
18 des Ausgabezylinders 10 mit der ersten Kammer 26 des
Steuerzylinders 20 verbunden. Der Anfangswert des in diesen
beiden Kammern 18, 26 und der zweiten Leitung 42 herrschenden
Gegendrucks kann über ein zweites Absperrventil 44 und einen
Gegendruck-Regler 46 eingestellt werden, der mittels einer
dritten Leitung 48 mit dem Anschluß 2 des Schiebers 36 verbunden
ist und der durch entsprechende Einstellung des Schiebers
36 mit der Druckluftquelle 32 verbindbar ist. In der
dritten Leitung 48 befindet sich zwischen dem Gegendruckregler
46 und dem Anschluß 2 des Schiebers 36 ein Rückschlagventil
50, das Druckluft nur von der Druckluftquelle 32 zu dem Gegendruck-Regler
46 durchläßt. Compressed air from a compressed air source serves as the pressurized
Mittels eines Linear-Reglers 52, dessen Anschluß 2 mit der
zweiten Kammer 28 des Steuerzylinders 20, dessen Steuersignal-Anschluß
4 mit der zweiten Leitung 42 und dessen Anschluß 1
über ein Rückschlagventil 54 und das Absperrventil 34 mit der
Druckluftquelle 32 verbunden ist und dessen Anschluß 3 frei
ist, wird der Druck in der zweiten Kammer 28 des Steuerzylinders
20 so geregelt, daß er gleich dem Druck in der ersten
Kammer 26 des Steuerzylinders 20 und damit gleich dem Gegendruck
im Ausgabezylinder 10 ist.By means of a
Für den Betrieb wird das erste Absperrventil 34 in seine
Durchleitungsstellung gebracht. Der Schieber 36 wird so eingestellt,
daß eine Verbindung zwischen den Anschlüssen 1 und 2
besteht, so daß sich der Gegendruck über den Gegendruck-Regler
46 und das zweite Absperrventil 44, das dazu in seiner Durchleitungsstellung
steht, aufbauen kann, z.B. auf 2 bar. In
dieser Stellung wird die erste Kammer 16 des Ausgabezylinders
10 über ein zur Drossel 38 parallel liegendes Rückschlagventil
56 und die Verbindung zwischen den Anschlüssen 4 und 3 des
Schiebers 36 entlüftet. Die beiden Kolben 12, 22 fahren dadurch
in ihre Ausgangsposition zurück, in der die Volumina der
ersten Kammern 16, 26 minimal und die der zweiten Kammern 18,
28 maximal sind. Zum Ausfahren des Ausgabekolbens 12 wird der
Schieber 36 in die Stellung gebracht, in der die Anschlüsse 1
und 4 verbunden sind, so daß Druckluft von beispielsweise 4
bar in die erste Kammer 16 des Ausgabezylinders 10 geleitet
wird. Der Ausgabekolben 12 fährt dadurch aus (in Fig. 1 nach
links) und schleppt in Folge der Kopplung 30 den Steuerkolben
22 mit. Das Volumen der zweiten Kammer 18 des Ausgabezylinders
10 verringert sich dadurch. Gleichzeitig vergrößert sich dadurch
das Volumen der ersten Kammer 26 des Steuerzylinders 20.
Da der Durchmesser des Steuerzylinders 20 größer ist als der
des Ausgabezylinders 10, vergrößert sich das Gesamtvolumen
dieser beiden über die zweite Leitung 42 verbundenen Kammern
18, 26, so daß der Gegendruck sinkt. Mit fortschreitender Ausfahrbewegung
des Ausgabekolbens 12 steigt dadurch die von ihm
erzeugte Kraft im Beispielsfall entsprechend einem resultierenden
Druckanstieg von 2 auf 4 bar.For operation, the first shut-off
Da über den Linearregler 52 der Druck in beiden Kammern 26, 28
des Steuerzylinders gleichgehalten wird, erzeugt dieser Zylinder
nahezu keine Kraft. Dadurch, daß sich die zweite Kammer 28
auf der Seite der Kolbenstange 24 befindet ist die druckbeaufschlagte
Fläche auf dieser Seite des Steuerkolbens 22 etwas
kleiner, so daß der Steuerkolben 22 eine geringe in Ausfahrrichtung
zeigende Kraft erzeugt. Diese Kraft dient jedoch lediglich
der Überwindung der Reibung in beiden Zylindern 10, 20
beim Ausfahren der Kolbenstangen.Since the pressure in both
Zum Entlüften der Vorrichtung wird das erste Absperrventil 34
in seine Sperrstellung gebracht, der Schieber 36 in die Stellung,
in der die Anschlüsse 1 und 2 bzw. 3 und 4 verbunden
sind, so daß die erste Leitung 40 entlüftet wird. Die zweite
Leitung 42 wird dabei belüftet, die Kolbenstangen 14 und 24
eingefahren und die Kammern 18, 26 und 28 mit dem geregelten
Anfangswert des Gegendrucks, z.B. 2 bar gefüllt. Wird bei Bedarf
das zweite Absperrventil 44 in seine Entlüftungsstellung
gebracht, wird die zweite Leitung 42 entlüftet.The first shut-off
Claims (6)
- Method for the path-dependent control of the force generated by a first piston (12), the first piston (12) travelling in a first cylinder (10) that is divided into a first and second chamber (16, 18) by the first piston (12), a pressure fluid (32) being conducted into the first chamber (16), a second cylinder (20) being provided in which a second piston (22) is travelling and that is also divided by the second piston (22) into a first and a second chamber (26, 28), the two pistons (12, 22) being coupled (30) so that the second piston (22) is pulled along by the first piston (12), the pistons (12, 22) move synchronously and a reduction of the second chamber (18) of the first cylinder (10) is accompanied by an enlargement of the first chamber (26) of the second cylinder (20), and the second chamber (18) of the first cylinder (10) being connected to the first chamber (26) of the second cylinder (20) so that the same pressure prevails in both chambers (18 and 26), characterized bythe pressure in the second chamber (28) of the second cylinder (20) being regulated such that it is always equal to the counterpressure in the first chamber (26) of the second cylinder (20) and the second chamber (18) of the first cylinder (10); andthe arrangement being such that the counterpressure falls and the force generated by the first cylinder (10) increases continuously in a path-dependent manner during an extension movement of the first piston (12) in case the diameter of the second cylinder (20) is greater than that of the first cylinder (10) and, due to that, the overall volume of the second chamber (18) of the first cylinder (10) and the first chamber (26) of the second cylinder (20) increases when the first piston (12) performs an extension movement, and that the force generated by the first cylinder (10) falls continuously during an extension movement in case the second cylinder (20) has a smaller diameter.
- Method according to claim 1, characterized in that the initial value of the counterpressure in the second chamber (18) of the first cylinder (10) is adjustable.
- Method according to claim 1 or 2, characterized in that the diameter of the second cylinder (20) is greater than that of the first cylinder (10) so that the counterpressure sinks when the first piston (12) performs an extension movement and in that the force generated by the piston (12) thereby increases path-dependent linearly.
- Apparatus for carrying out the method according to any one of claims 1 to 3, comprising a source (32) for a pressure fluid, a first cylinder (10) in which a first piston (12) is travelling and which is divided into a first and second chamber (16, 18) by the first piston (12), the pressure fluid (32) being conducted into the first chamber (16), a second cylinder (20) in which a second piston (22) is travelling and which is also divided by the second piston (22) into a first and second chamber (26, 28), a line (42) that connects the second chamber (18) of the first cylinder (10) to the first chamber (26) of the second cylinder (20), and a coupling (30) of the two pistons (12, 22) so that the second piston (22) is pulled along by the first piston (12), the pistons (12, 22) move synchronously and a reduction of the second chamber (18) of the first cylinder (10) is accompanied by an enlargement of the first chamber (26) of the second cylinder (20); characterizedby a linear regulator (52) which regulates the pressure in the second chamber (28) of the second cylinder (20) such that it is always equal to the counterpressure in the first chamber (26) of the second cylinder (20) and the second chamber (18) of the first cylinder (10),the arrangement being such that the counterpressure falls and the force generated by the first cylinder (10) increases continuously in a path-dependent manner during an extension movement of the first piston (12) in case the diameter of the second cylinder (20) is greater than that of the first cylinder (10) and, due to that, the overall volume of the second chamber (18) of the first cylinder (10) and the first chamber (26) of the second cylinder (20) increases when the first piston (12) performs an extension movement, and that the force generated by the first cylinder (10) falls continuously during an extension movement in case the second cylinder (20) has a smaller diameter.
- Apparatus according to claim 4, characterized by the initial value of the counterpressure in the second chamber (18) of the first cylinder (10) being adjustable.
- Apparatus according to claim 4 or 7, characterized in that the diameter of the second cylinder (20) is greater than that of the first cylinder (10) so that the counterpressure sinks when the first piston (12) performs an extension movement and in that the force generated by the piston (12) thereby increases path-dependent linearly.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE29808049U | 1998-05-06 | ||
DE29808049U DE29808049U1 (en) | 1998-05-06 | 1998-05-06 | Device for the path-dependent control of the force generated by a piston |
PCT/EP1999/003111 WO1999057443A1 (en) | 1998-05-06 | 1999-05-06 | Device for the stroke-dependent adjustment of the force generated by a piston |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1076778A1 EP1076778A1 (en) | 2001-02-21 |
EP1076778B1 true EP1076778B1 (en) | 2003-02-26 |
Family
ID=8056687
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99948561A Expired - Lifetime EP1076778B1 (en) | 1998-05-06 | 1999-05-06 | Device for the stroke-dependent adjustment of the force generated by a piston |
Country Status (5)
Country | Link |
---|---|
US (1) | US6397726B1 (en) |
EP (1) | EP1076778B1 (en) |
AU (1) | AU4258499A (en) |
DE (2) | DE29808049U1 (en) |
WO (1) | WO1999057443A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105179356A (en) * | 2015-08-27 | 2015-12-23 | 徐州重型机械有限公司 | Auxiliary boom control valve, auxiliary boom hydraulic control system and crane |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19959569A1 (en) * | 1999-12-10 | 2001-06-13 | Mannesmann Rexroth Ag | Hydraulic control arrangement for controlling two differently high pressures on a hydraulic consumer, in particular of two differently high clamping pressures for holding a workpiece in a machine tool |
NL1020593C2 (en) * | 2002-05-14 | 2003-11-17 | Lely Entpr Ag | Operating method for actuator cylinder, especially hydraulic cylinder in agricultural machine, involves automatically controlling amount of fluid between piston and valve |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1110872A (en) | 1964-07-25 | 1968-04-24 | Williams Holdings Ltd Edward | Hydraulic drives |
US4255930A (en) | 1979-08-10 | 1981-03-17 | Natalie Adam J | Power device |
DE4234535A1 (en) | 1992-10-14 | 1994-04-21 | Abb Henschel Waggon Union | Running gear for rail vehicles |
DE4441098C2 (en) | 1994-11-18 | 1996-09-26 | Porsche Ag | Actuator supported by external power |
-
1998
- 1998-05-06 DE DE29808049U patent/DE29808049U1/en not_active Expired - Lifetime
-
1999
- 1999-05-06 AU AU42584/99A patent/AU4258499A/en not_active Abandoned
- 1999-05-06 EP EP99948561A patent/EP1076778B1/en not_active Expired - Lifetime
- 1999-05-06 WO PCT/EP1999/003111 patent/WO1999057443A1/en active IP Right Grant
- 1999-05-06 DE DE59904374T patent/DE59904374D1/en not_active Expired - Fee Related
- 1999-05-06 US US09/673,656 patent/US6397726B1/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105179356A (en) * | 2015-08-27 | 2015-12-23 | 徐州重型机械有限公司 | Auxiliary boom control valve, auxiliary boom hydraulic control system and crane |
Also Published As
Publication number | Publication date |
---|---|
AU4258499A (en) | 1999-11-23 |
DE29808049U1 (en) | 1998-07-30 |
EP1076778A1 (en) | 2001-02-21 |
US6397726B1 (en) | 2002-06-04 |
WO1999057443B1 (en) | 2000-01-20 |
WO1999057443A1 (en) | 1999-11-11 |
DE59904374D1 (en) | 2003-04-03 |
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