EP3880975B1 - Système d'actionneur électrohydrostatique - Google Patents

Système d'actionneur électrohydrostatique Download PDF

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Publication number
EP3880975B1
EP3880975B1 EP19790498.0A EP19790498A EP3880975B1 EP 3880975 B1 EP3880975 B1 EP 3880975B1 EP 19790498 A EP19790498 A EP 19790498A EP 3880975 B1 EP3880975 B1 EP 3880975B1
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EP
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Prior art keywords
hydraulic
chamber
valve
electro
main
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EP19790498.0A
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German (de)
English (en)
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EP3880975A1 (fr
Inventor
Sascha DANY
Rainer Kohlhaas
Kristof SCHLEMMER
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Moog Luxembourg SARL
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Moog Luxembourg SARL
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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
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • 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
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • 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
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/021—Installations or systems with accumulators used for damping
    • 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
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/024—Installations or systems with accumulators used as a supplementary power source, e.g. to store energy in idle periods to balance pump load
    • 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
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/20—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors controlling several interacting or sequentially-operating 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/22—Synchronisation of the movement of two or more servomotors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
    • B21D24/10—Devices controlling or operating blank holders independently, or in conjunction with dies
    • B21D24/14—Devices controlling or operating blank holders independently, or in conjunction with dies pneumatically or hydraulically
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16—Control arrangements for fluid-driven presses
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20507—Type of prime mover
    • F15B2211/20515—Electric motor
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20546—Type of pump variable capacity
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20561—Type of pump reversible
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
    • F15B2211/212—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being accumulators
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/27—Directional control by means of the pressure source
    • 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
    • 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
    • F15B2211/3059—Assemblies of multiple valves having multiple valves for multiple 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
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/3056—Assemblies of multiple valves
    • F15B2211/3059—Assemblies of multiple valves having multiple valves for multiple output members
    • F15B2211/30595—Assemblies of multiple valves having multiple valves for multiple output members with additional valves between the groups of valves for multiple 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
    • F15B2211/30—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
    • 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
    • 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
    • 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
    • F15B2211/31552—Directional control characterised by the connections of the valve or valves in the circuit being connected to an output member and a return line
    • 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/61—Secondary circuits
    • F15B2211/613—Feeding circuits
    • 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/625—Accumulators
    • 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
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F15B2211/7114—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators
    • F15B2211/7128—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators the chambers being connected in parallel

Definitions

  • the present invention relates to an electrohydrostatic actuator system and, more particularly, to an electrohydrostatic actuator system having two moving axes.
  • Electrohydrostatic actuator systems are widely known in the prior art, with usually only one consumer being operated by one actuator. If several consumers are used in the system, then several actuators are required in the prior art.
  • the volume flow will take the path of least resistance and the consumers, for example the axes, will move in an undefined manner, resulting in an uncontrollable system.
  • a constant pressure system can be provided for the use of several actuators. This is fed either continuously or intermittently through a pump train, whereby when peak power is required, it is delivered via a storage system.
  • a pump train whereby when peak power is required, it is delivered via a storage system.
  • Such a system consumes a lot of power and is difficult to control, and improved actuator systems are needed.
  • U.S. 2012/048029 A1 shows a hydraulic system with an oil tank for storing operating oil, a hydraulic actuator and a hydraulic pump that sucks the operating oil from the oil tank and supplies the hydraulic actuator with the operating oil.
  • CN 2 852 100 Y shows a hydraulic system of a high-speed wire rope and seal friction testing machine with a hydraulic pump, a hydraulic motor, an overdrive cylinder, a tensioning cylinder, a high-speed-low-speed conversion oil cylinder, a hydraulic control valve.
  • An oil suction port of the hydraulic pump is connected to an oil tank, and an oil discharge port is connected to a pressure reducing valve, a speed regulating valve, an electrohydraulic switching valve and a variety of electromagnetic switching valves via a one-way valve,
  • DE 894 384 C shows a hydraulic sheet metal drawing press with an inner drawing carriage, an outer carriage holding the sheet metal to be drawn, devices actuated by hydraulic pressure medium which drive the carriages in the working direction.
  • the sheet metal holding carriage is supported by the drawing carriage so that it can move with it and also relative to it. Means are provided for providing a time delay between engagement of the holding carriage with the workpiece and operative engagement of the drawing carriage with the workpiece, the sheet metal holding carriage being lifted off the workpiece by retraction of the drawing carriage.
  • EP 0 631 740 A1 shows a glue stick with a piston that carries the stick mass and a sleeve that surrounds the stick mass, wherein the drive device for moving the stick mass up and down, which also serves as an actuating element, is designed as a uniform injection molded part together with the sleeve and the piston .
  • the drive and actuating element is arcuate. Two such driving and actuating elements can also be provided, which are opposite one another and are each arranged with one end on the edge of the sleeve.
  • the electrohydrostatic actuator system comprises a hydraulic machine with variable volume and/or speed, driven by an electric motor, comprising two connections with two connection lines for providing a volume flow of hydraulic fluid, and a main axis that can be moved by the hydraulic fluid and has at least one first chamber, the first chamber With at least a first main hydraulic line and a first main valve via a first
  • Connecting line is hydraulically connected to the hydraulic machine.
  • the actuator system according to the invention comprises a secondary axle that can be moved by the hydraulic fluid and has at least one first chamber, the first chamber having at least one first secondary hydraulic line and a first secondary valve being connected to a second connection of the hydraulic machine via a second connection line or to the first connection of the hydraulic machine via the first connection line Hydraulic machine is hydraulically connected.
  • a hydraulic accumulator is also hydraulically connected to the first secondary hydraulic line in the area between the first chamber of the secondary axle and the first secondary valve.
  • an electrohydrostatic actuator system which has a hydraulic machine with variable volume and/or speed, driven by an electric motor, and a main axle and a secondary axle, each with at least one chamber.
  • the at least one chamber of the main and secondary axles is hydraulically connected to a main or secondary hydraulic line and to the hydraulic machine via a main or secondary valve.
  • a hydraulic accumulator which is hydraulically connected to the secondary hydraulic line, is arranged between the chamber of the secondary axle and the secondary valve.
  • Electric motors are known in the prior art and are used to drive the hydraulic machine.
  • the hydraulic machine is variable in terms of volume and/or speed and can preferably provide two possible directions of flow of the hydraulic fluid in the closed hydraulic circuit during operation.
  • the hydraulic machine can also have either a variable-speed electric motor and a constant pump, or a constant-speed electric motor and a variable-displacement pump, or a variable-speed electric motor and a variable-displacement pump.
  • the selection of the hydraulic machine is determined by factors such as system costs, reliability, permitted noise emissions or efficiency.
  • the axes of the actuator system according to the invention are movable, the movement preferably being provided by the hydraulic fluid entering or exiting the chambers and the pressure build-up or pressure reduction associated therewith.
  • the main axis can be a deformation axis and the secondary axis can be a clamping axis.
  • a workpiece to be machined is clamped by the clamping axis and (formed) by the forming axis.
  • the axes can also have other functions.
  • the secondary axle is prestressed mechanically and in particular with a spring system and/or a weight system.
  • the axes are used for the same process sequence and not for different functions that are not correlated with one another. If the functions are connected to one another, the present invention is particularly advantageous since a process that requires two axes can be controlled by means of a single hydraulic machine—as will be explained later in more detail.
  • major and secondary axis should not be construed as implying that one of the axes is more important than the other, but rather to distinguish the axes.
  • Both the main axle and the secondary axle have at least one first chamber into which hydraulic fluid can flow.
  • the chambers are each hydraulically connected via a line and via a valve to a connection of the hydraulic machine.
  • the hydraulic machine operated by the electric motor thus provides a hydraulic fluid flow in the respective first chambers of the main and secondary axles, causing the axles to move.
  • the arrangement of the hydraulic accumulator on the first secondary hydraulic line in the area between the first chamber of the secondary axle and the first secondary valve is advantageous in this embodiment according to the invention.
  • the arrangement of the hydraulic accumulator according to the invention also expands the hydraulic fluid in the hydraulic accumulator by expanding the hydraulic fluid of the secondary axle, so that the pressure of the hydraulic fluid in the first chamber of the secondary axle corresponds to the pressure of the hydraulic fluid in the hydraulic accumulator.
  • the hydraulic machine can be used for clamping or for controlling the primary axle.
  • the primary axle can thus be operated by means of the same hydraulic machine, it being possible in particular for both axles to work in parallel by means of a single hydraulic machine.
  • the hydraulic fluid is preloaded in the connecting lines.
  • the pretensioning can be provided, for example, by means of a further hydraulic machine, an accumulator or the like.
  • connection lines are the lines that hydraulically connect the main or secondary valve to the connections of the hydraulic machine. Pre-stressing the connection lines is advantageous here, since there is always a certain pressure in the system; thus, hydraulic fluid does not have to be continually pressurized from a fully relaxed state to the desired state, which in turn results in substantial energy savings.
  • the pressure in the connecting lines can be 10 bar, for example.
  • the main reason for the preload is to ensure a minimum pressure in the two actuator chambers and thus to avoid cavitation even in the event of a strong pressure drop, e.g. with rapid pressure changes and movements.
  • the first secondary hydraulic line can be hydraulically connected to a drain line and a safety valve and/or a 2-way valve, in particular a drain valve.
  • the pressure in the secondary hydraulic line and, accordingly, the pressure in the first chamber of the secondary axle and the pressure in the hydraulic accumulator can be relieved through the drain line.
  • Such a drain system can also be used and arranged accordingly on the main hydraulic line. Accordingly, the discharge lines of the main hydraulic line and the secondary hydraulic line can also be the same. It is also within the meaning of the invention that the hydraulic fluid expanded in the drain line flows into a tank where it can be used for other purposes.
  • the tank can be the same tank that is used to feed hydraulic fluid into the system, thereby providing a closed system.
  • cleaning, venting and/or cooling devices can also be connected to the drain line, so that, for example, the hydraulic fluid is vented before it is fed back into the system.
  • the connecting line can also be arranged in such a way that it only serves to relieve the hydraulic accumulator, while the first chamber of the secondary axle is relieved by means of a further line, for example by means of the connecting line, which is also connected to the tank. In this way, it is possible to precisely control where the pressure relief is to take place.
  • the hydraulic machine can be used to relieve the pressure in the chambers of the main and/or secondary axle.
  • the hydraulic machine can provide a flow of hydraulic fluid from one of the chambers into the tank by means of a sip flow.
  • the first chamber of the main axle and the first chamber of the secondary axle are hydraulically connected to the same connection line of the hydraulic machine.
  • the additional connection line of the hydraulic machine can be hydraulically connected, for example, to the tank from which the hydraulic fluid for clamping the actuator system is stolen.
  • the first main valve and/or the first secondary valve are controlled valves.
  • both valves can be controlled, since this enables improved and more precise actuator control and the process sequences can thus be controlled more easily.
  • the secondary valve can also be a continuous valve, so that a local constant pressure system is generated by the hydraulic accumulator and the valve.
  • the control can take place in any way known in the prior art, such as by means of electrically controlled valves.
  • the main axle has at least one second chamber, the second chamber being hydraulically connected to at least one second main hydraulic line and a second main valve via the second connection line to the second connection of the hydraulic machine.
  • the secondary axle also has at least one second chamber, the second chamber being hydraulically connected to at least one second secondary hydraulic line and a second secondary valve via a connecting line to the hydraulic machine.
  • the main axle and the secondary axle can be selected from a group which includes, for example, differential cylinders, synchronous cylinders, telescopic cylinders and similar cylinders.
  • the choice of axis typology depends on the function that the axes have to perform; for example, the main axle can be a differential cylinder if the axle is used in a press.
  • the main axis and secondary axis do not necessarily have to be designed as the same type of cylinder.
  • both the main axle and the secondary axle each have a second chamber
  • the second chamber of the main axle and the second chamber of the secondary axle are hydraulically connected to the same connection line of the hydraulic machine, with the connection line being different from that Connection line with which the first chamber of the main and secondary axle is hydraulically connected.
  • the second main valve and/or the second secondary valve are controlled valves.
  • the controllability of the second main and/or secondary valves offers improved control of the entire system, which improves the efficiency of the system and can therefore be operated in a more energy- and cost-saving manner.
  • At least one of the controlled valves can be unlocked by means of a control valve.
  • At least one of the control valves is hydraulically connected to at least one of the connection lines of the hydraulic machine by means of check valves.
  • control valve circuits for the main and/or secondary valves are hydraulically connected to the connection lines of the hydraulic machine.
  • hydraulic fluid that is in the system also flows through the circuits of the control valves, whereby no additional clamping and in particular no additional independent control circuit is required.
  • a method for operating the electrohydrostatic actuator system according to the invention according to one of the described embodiments is claimed. According to such a method according to the invention, the main axle and the secondary axle are operated in parallel or sequentially by the same hydraulic machine.
  • Operating the axes in parallel generally consists of several steps.
  • the connection to the hydraulic machine is interrupted by the secondary valve. Since the clamped hydraulic accumulator is connected to the chamber of the secondary axle, the secondary axle remains clamped. Accordingly, the hydraulic machine is used to provide a flow of hydraulic fluid into the primary axle. After the expiry, the axes are relaxed.
  • an actuator system by means of one of the methods described above is also claimed.
  • the system can be used for forming molded parts, for deep-drawing molded parts, or by other similar methods that require an electrohydrostatic actuator system.
  • figure 1 12 shows a general arrangement of an exemplary embodiment of the actuator system 1 with two movable axes according to the invention.
  • the exemplary embodiment according to the invention of the actuator system 1 has a hydraulic machine 11 with a variable volume and/or speed, driven by an electric motor 10, for providing a volume flow of a hydraulic fluid.
  • the system 1 also has a main axis 20, which is designed as a differential cylinder with a first chamber 22 and a second chamber 24, the first chamber 22 being connected by a first main hydraulic line 52 and by a first connecting line 12 and the second chamber 24 being connected by a second main hydraulic line 54 and are hydraulically connected by a second connecting line 14 to a respective connection of the hydraulic machine 11 .
  • a main axis 20 which is designed as a differential cylinder with a first chamber 22 and a second chamber 24, the first chamber 22 being connected by a first main hydraulic line 52 and by a first connecting line 12 and the second chamber 24 being connected by a second main hydraulic line 54 and are hydraulically connected by a second connecting line 14 to a respective connection of the hydraulic machine 11 .
  • a first and a second main valve 23 and 25 are arranged between the hydraulic machine and the first and the second chamber 22, 24 of the main axle 20, respectively. These are in the figure 1 shown as a controlled 2/2-way valve with a flow and a blocking position.
  • the exemplary embodiment of the actuator system 1 has a secondary axle 30, which also has a first chamber 32 and a second chamber 34, with the first chamber 32 passing through a first secondary hydraulic line 62 and through the first connection line 12 and the second chamber 34 a second secondary hydraulic line 64 and through the second connection line 14, with a respective connection of the hydraulic machine 11 is hydraulically connected.
  • a valve assembly 90 and a hydraulic accumulator 40 are hydraulically connected to the secondary axle 30 .
  • Some embodiments of how the valve assembly 90 is designed are explained in the next figures.
  • the arrangement should be such that it is possible to operate both the main axle 20 and the secondary axle 30 sequentially and/or in parallel using a single hydraulic machine 11 .
  • the valve arrangement 90 can be used to block a hydraulic fluid flow from the first and/or second chambers 32, 34 of the secondary axle 30 in the direction of or to the hydraulic machine 11 as desired, so that the hydraulic machine 11 mainly flows to the main axle 20 acts.
  • the valve arrangement 90 should be designed in such a way that the first and/or second chamber 32, 34 of the secondary axle 30 can be relieved of pressure.
  • the system 1 has a source 80 and a preload source 82 which are used to preload the connection lines 12 and 14 of the hydraulic machine 11 .
  • the hydraulic machine 11 is also hydraulically connected to a tank 84, from which the hydraulic machine 11 takes hydraulic fluid and feeds it into the system.
  • the hydraulic fluid flows into the preload source 82 or the tank 84.
  • This can be done, for example, by means of the hydraulic machine 11 and/or like in the figure 1 shown, by an additional line 98a which is connected to the tank 84 or the biasing source 82 through a pilot-operated valve 92, in this case a pilot-operated check valve.
  • Another line 98b with another pilot-operated valve 94 is used both for the hydraulic connection of the source 80 and the preload source 82 to the hydraulic machine 11 and for decompression of the second chamber 24, 34 of the main and/or secondary axle 20, 30.
  • a drain line 42 can be hydraulically connected to a pilot operated valve 43 at the connection of the hydraulic accumulator and to the tank 84 .
  • hydraulic accumulator 40 can be relieved of pressure by means of additional line 42 and pilot-operated valve 43 .
  • figure 2 shows an exemplary embodiment of the system according to the invention Figure. 1 .
  • the general structure of the system 1 is unchanged.
  • the arrangement of the valves on the secondary axle 30 is different.
  • the secondary axle 30 is shown as a differential cylinder, with the arrangement of a synchronous cylinder also being conceivable.
  • the secondary axle 30 has a first chamber 32 and a hydraulic accumulator 40 connected to the first chamber 32 by the first secondary hydraulic line 62 and a second chamber 34 .
  • the valve arrangement 90 includes a secondary valve 33, the first chamber 32 and the second chamber 34 of the secondary axle being hydraulically connected to the hydraulic machine through the first secondary hydraulic line 62 and the second secondary hydraulic line 64, respectively, through the common secondary valve 33.
  • the first secondary valve 33 is a 4/2-way valve 33 with a flow position and a blocking position, so that both the first secondary hydraulic line 62 and the second secondary hydraulic line 64 are either open or blocked at the same time.
  • the hydraulic machine 11 can work directly in the two chambers 32, 34 of the secondary axle 30 and in the hydraulic accumulator 40.
  • the hydraulic machine 11 can provide a hydraulic fluid flow into the first chamber 32 of the secondary axle 30 and into the hydraulic accumulator 40 so that the secondary axle 30 is clamped while hydraulic fluid is withdrawn from the second chamber 34 .
  • the hydraulic connection of the secondary axle 30 to the hydraulic machine 11 is interrupted by the valve 33, with the secondary axle 30 remaining in a clamped state by the hydraulic accumulator 40.
  • the hydraulic machine 11 can accordingly act on the primary axle 20 while the secondary axle remains in a clamped state.
  • secondary valve 33 may be flowed and valves 92 and/or 94 unblocked, allowing hydraulic fluid to flow into biasing source 82 .
  • the hydraulic accumulator 40 can be relieved directly into the tank 84 by means of a valve 43 and a drain line 42 .
  • FIG figure 3 shows a similar exemplary embodiment of the actuator system according to the invention as shown in FIG figure 2 ,
  • the valve arrangement 90 instead of a single secondary valve comprising a first secondary valve 33 which is arranged on the first secondary hydraulic line 62 and a second secondary valve 35 which is arranged on the second secondary hydraulic line 64.
  • both the first and the second secondary valve 33, 35 are controlled 2/2-way valves, each with a flow and a blocking position.
  • the loading and unloading of the first and/or the second chamber 32, 34 of the secondary axle can be controlled individually.
  • figure 4 shows an exemplary actuator system.
  • the valve arrangement 90 includes a 4/3-way valve 33 with a flow, cross-flow and blocking position, which is arranged both on the first secondary hydraulic line 62 and on the second secondary hydraulic line 64, and a 2/2-way valve 35 with a flow and blocking position, which is arranged on a line that connects the hydraulic accumulator 40 and the secondary axle 30 to the connection line 12 .
  • a drain line 94 is connected to the 4/3-way valve 33 so that either the first chamber 32 or the second chamber 34 of the secondary axle 30 is connected to the drain line 94 in the respective flow positions. Furthermore, the drain line 94 is hydraulically connected to the tank 84 so that when the hydraulic fluid is released from one of the two chambers 32 , 34 , it can flow directly into the tank 84 .
  • the second secondary valve 35 blocks the connection between the secondary axle 30 and the hydraulic accumulator 40 with the connection line 12 and accordingly with the rest of the system 1.
  • the hydraulic accumulator 40 can be relieved, for example, by means of the second secondary valve 35, through the line 12, 98a and by unblocking the valve 92 or, as shown in the previous figures, through an alternative line 42.
  • the secondary axle 30 may be a preloaded cylinder instead of a differential cylinder.
  • the cylinder can be prestressed by means of a spring or also by means of a weight system, with the cylinder having at least one ventilation device on its prestressed chamber 34 so that the air can escape during the pressing process.
  • the valve arrangement 90 comprises a 2-way valve 33 with a flow position and a blocking position;
  • the first chamber 32 of the secondary axle 30 is hydraulically connected to the connecting line 12 or to the hydraulic machine 11 through the first hydraulic line 62 and the secondary valve 33 .
  • the pressure accumulator 40 is also hydraulically connected both to the secondary hydraulic line 62 and to the secondary valve 33 .
  • the secondary valve 33 and the controlled valve 92 can be unlocked, for example, so that the relieved hydraulic fluid flows into the preload source 82.
  • the hydraulic accumulator 40 can also be hydraulically connected to a drain valve 43 on the tank 84 by a drain line 42 in this exemplary embodiment according to the invention. In this embodiment, however, it is only possible to depressurize the first chamber 32 at the same time as the hydraulic accumulator 40 .
  • the first chamber 32 of the secondary axle 30 and the hydraulic accumulator 40 can be relieved individually or together by means of the selected valve assembly 90.
  • valve arrangement 90 comprises a 3-way valve connected to the secondary hydraulic line, with a flow position, a cross-flow position and a blocking position.
  • the valve arrangement also includes a second secondary valve 35 which, as in the previous example, is designed as a 2-way valve that connects the connection line 12 to the secondary axle 30 and/or the hydraulic accumulator 40 .
  • Hydraulic accumulator 40 may be hydraulically connected to tank 84 through a drain line 42 having a drain valve 43; thus, by blocking the first secondary valve 33 and opening the drain valve 43, the hydraulic accumulator 40 alone can be relieved.
  • Reference List 1 actuator system 35 second secondary valve 10 electric motor 40 hydraulic accumulator 11 hydro machine 42 drain line 12 first connection line 43 2-way drain valve 14 second connection line 52 first main hydraulic line 20 main axis 54 second main hydraulic line 22 first chamber of the main axis 62 first secondary hydraulic line 23 first main valve 64 second secondary hydraulic line 24 second chamber of the main axis 80 source 25 second main valve 82 bias source 30 secondary axis 84 tank 32 first chamber of the secondary axis 90 valve assembly 33 first secondary valve 94 drain line 34 second chamber of the secondary axis 98a, 98b drain lines

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)

Claims (16)

  1. Système d'actionneur électro-hydrostatique (1) comportant au moins deux axes mobiles, comprenant :
    une machine hydraulique (11) entraînée par un moteur électrique (10) à volume et/ou vitesse variables, comprenant deux raccords comportant deux conduites de raccordement pour la fourniture d'un débit volumétrique d'un fluide hydraulique ;
    un axe principal (20) pouvant être déplacé par le fluide hydraulique et comportant au moins une première chambre (22), la première chambre (22) étant reliée hydrauliquement à un premier raccord de la machine hydraulique (11) à l'aide d'au moins une première conduite hydraulique principale (52) et une première soupape principale (23) par l'intermédiaire d'une première conduite de raccordement (12) ;
    un axe secondaire (30) pouvant être déplacé par le fluide hydraulique et comportant au moins une première chambre (32), la première chambre (32) étant reliée hydrauliquement à un second raccord de la machine hydraulique (11) à l'aide d'au moins une première conduite hydraulique secondaire (62) et une première soupape secondaire (33) par l'intermédiaire d'une seconde conduite de raccordement (14) ou étant reliée hydrauliquement au premier raccord de la machine hydraulique (11) par l'intermédiaire de la première conduite de raccordement (12) ; et
    dans lequel un accumulateur hydraulique (40) est relié hydrauliquement à la première conduite hydraulique secondaire (62) dans la zone entre la première chambre (32) de l'axe secondaire (30) et la première soupape secondaire (33),
    caractérisé en ce que
    l'axe principal (20) présente au moins une seconde chambre (24), la seconde chambre (24) étant reliée hydrauliquement au second raccord de la machine hydraulique (11) à l'aide d'au moins une seconde conduite hydraulique principale (54) et une seconde soupape principale (25) par l'intermédiaire de la seconde conduite de raccordement (14).
  2. Système d'actionneur électro-hydrostatique (1) selon la revendication 1, caractérisé en ce que le fluide hydraulique est précontraint dans les conduites de raccordement.
  3. Système d'actionneur électro-hydrostatique (1) selon l'une des revendications précédentes, caractérisé en ce qu'un accumulateur hydraulique supplémentaire est relié hydrauliquement à la première conduite hydraulique principale (52) dans la zone entre la première chambre (22) de l'axe principal (20) et la première soupape principale (23).
  4. Système d'actionneur électro-hydrostatique (1) selon l'une des revendications précédentes, caractérisé en ce que la première conduite hydraulique secondaire (62) et/ou la première conduite hydraulique principale (52) sont reliées hydrauliquement à une conduite de vidange (94) et une soupape de sécurité et/ou une soupape à deux voies, en particulier une soupape de vidange.
  5. Système d'actionneur électro-hydrostatique (1) selon l'une des revendications précédentes, caractérisé en ce que la première chambre (22) de l'axe principal (20) et la première chambre (32) de l'axe secondaire (30) sont reliées hydrauliquement à la même conduite de raccordement de la machine hydraulique (11).
  6. Système d'actionneur électro-hydrostatique (1) selon l'une des revendications précédentes, caractérisé en ce que la première soupape principale (23) et/ou la première soupape secondaire (33) sont des soupapes commandées.
  7. Système d'actionneur électro-hydrostatique (1) selon l'une des revendications précédentes, caractérisé en ce que l'axe secondaire est précontraint mécaniquement, et en particulier avec un système de ressort ou un système de poids.
  8. Système d'actionneur électro-hydrostatique (1) selon l'une des revendications précédentes, caractérisé en ce que l'axe secondaire (30) présente au moins une seconde chambre (34), la seconde chambre (34) étant reliée hydrauliquement à la machine hydraulique (11) à l'aide d'au moins une seconde conduite hydraulique secondaire et une seconde soupape secondaire par l'intermédiaire d'une conduite de raccordement.
  9. Système d'actionneur électro-hydrostatique (1) selon la revendication 8, caractérisé en ce que la seconde chambre (25) de l'axe principal (20) et la seconde chambre (35) de l'axe secondaire (30) sont reliées hydrauliquement à la même conduite de raccordement de la machine hydraulique (11), la conduite de raccordement étant différente de la conduite de raccordement de la première chambre (25) de l'axe principal (20) et de la première chambre (35) de l'axe secondaire (30).
  10. Système d'actionneur électro-hydrostatique (1) selon l'une des revendications 8 et 9 ou 9, caractérisé en ce que la seconde soupape principale (25) et/ou la seconde soupape secondaire (35) sont des soupapes commandées.
  11. Système d'actionneur électro-hydrostatique (1) selon l'une des revendications 6 et 10, caractérisé en ce qu'au moins l'une des soupapes commandées peut être déverrouillée au moyen d'une soupape de commande.
  12. Système d'actionneur électro-hydrostatique (1) selon la revendication 11, caractérisé en ce qu'au moins l'une des soupapes de commande est reliée hydrauliquement à au moins l'une des conduites de raccordement de la machine hydraulique (11) au moyen de soupapes antiretour.
  13. Système d'actionneur électro-hydrostatique (1) selon l'une des revendications 6 et 10, caractérisé en ce que l'axe principal est un axe de formage et l'axe secondaire est un axe de serrage.
  14. Procédé permettant de faire fonctionner un système d'actionneur électro-hydrostatique selon l'une des revendications 1 à 13, caractérisé en ce que l'axe principal (20) et l'axe secondaire (30) fonctionnent parallèlement ou séquentiellement au moyen de la même machine hydraulique (11).
  15. Procédé permettant de faire fonctionner un système d'actionneur électro-hydrostatique selon la revendication 14, caractérisé en ce que le fluide hydraulique est contraint dans l'accumulateur hydraulique (40) lors du serrage de l'axe secondaire (30).
  16. Utilisation d'un système d'actionneur électro-hydrostatique selon l'une des revendications 1 à 13 avec un procédé selon les revendications 14 et 15 pour le formage de pièces moulées ou l'emboutissage profond de pièces moulées.
EP19790498.0A 2018-11-13 2019-10-17 Système d'actionneur électrohydrostatique Active EP3880975B1 (fr)

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DE102018128318.0A DE102018128318A1 (de) 2018-11-13 2018-11-13 Elektrohydrostatisches Aktuatorsystem
PCT/EP2019/078273 WO2020099060A1 (fr) 2018-11-13 2019-10-17 Système d'actionneur électrohydrostatique

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WO (1) WO2020099060A1 (fr)

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EP3609692B1 (fr) * 2017-08-01 2021-07-21 Moog GmbH Appareil pour commander la permutation des vérins hydrauliques
DE102021123910A1 (de) * 2021-09-15 2023-03-16 HMS - Hybrid Motion Solutions GmbH Hydraulisches Antriebssystem mit einer 4Q Pumpeneinheit
CN115026233A (zh) * 2022-05-30 2022-09-09 湖州机床厂有限公司 环锻液压机及其控制方法

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US20220003250A1 (en) 2022-01-06
EP3880975A1 (fr) 2021-09-22
DE102018128318A1 (de) 2020-05-14
US11384778B2 (en) 2022-07-12
CN113272562A (zh) 2021-08-17
WO2020099060A1 (fr) 2020-05-22

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