EP1564414B1 - Hydraulischer Antrieb - Google Patents

Hydraulischer Antrieb Download PDF

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Publication number
EP1564414B1
EP1564414B1 EP04029899.4A EP04029899A EP1564414B1 EP 1564414 B1 EP1564414 B1 EP 1564414B1 EP 04029899 A EP04029899 A EP 04029899A EP 1564414 B1 EP1564414 B1 EP 1564414B1
Authority
EP
European Patent Office
Prior art keywords
pressure
line
pump
hydraulic
consumer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP04029899.4A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1564414A1 (de
Inventor
Michael Bökmann
Norbert Gwozdz
Manfred Mitze
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bosch Rexroth AG
MAE Maschinen und Apparatebau Goetzen GmbH
Original Assignee
Bosch Rexroth AG
MAE Maschinen und Apparatebau Goetzen GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bosch Rexroth AG, MAE Maschinen und Apparatebau Goetzen GmbH filed Critical Bosch Rexroth AG
Priority claimed from EP20030015768 external-priority patent/EP1387090B1/de
Publication of EP1564414A1 publication Critical patent/EP1564414A1/de
Application granted granted Critical
Publication of EP1564414B1 publication Critical patent/EP1564414B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • 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
    • 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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/027—Installations or systems with accumulators having accumulator charging devices
    • 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
    • F15B11/042—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the feed line, i.e. "meter in"
    • F15B11/0423—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the feed line, i.e. "meter in" by controlling pump output or bypass, other than to maintain constant speed
    • 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
    • F15B11/042—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the feed line, i.e. "meter in"
    • F15B11/0426—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the feed line, i.e. "meter in" by controlling the number of pumps or parallel valves switched on
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1476—Special return means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—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
    • F15B2211/20538—Type of pump constant 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
    • F15B2211/20569—Type of pump capable of working as pump and 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
    • F15B2211/20576—Systems with pumps with multiple pumps
    • F15B2211/20584—Combinations of pumps with high and low 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
    • F15B2211/30—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
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
    • 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
    • F15B2211/41536—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 being connected to multiple ports of 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
    • F15B2211/40—Flow control
    • F15B2211/47—Flow control in one direction only
    • F15B2211/473—Flow control in one direction only without restriction in the reverse direction
    • 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
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief 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
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50536—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using unloading valves controlling the supply pressure by diverting fluid to the 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
    • F15B2211/50—Pressure control
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5151—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and a directional control valve
    • 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
    • F15B2211/5153—Pressure control characterised by the connections of the pressure control means in the circuit being connected to an output member and a directional control valve
    • 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
    • F15B2211/55—Pressure control for limiting a pressure up to a maximum pressure, e.g. by using a pressure relief valve
    • 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
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6336—Electronic controllers using input signals representing a state of the output member, e.g. position, speed or acceleration
    • 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
    • F15B2211/665—Methods of control using electronic components
    • F15B2211/6651—Control of the prime mover, e.g. control of the output torque or rotational speed
    • 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
    • F15B2211/75—Control of speed of the output member

Definitions

  • the invention relates to a hydraulic drive for a consumer, in particular for a hydraulic cylinder according to the preamble of patent claim 1.
  • a hydraulic drive for a lifting cylinder known.
  • a bottom-side cylinder space of the lifting cylinder is supplied via a constant pump with variable-speed electric motor with pressure medium from a tank.
  • a piston rod-side annular space of the lifting cylinder is connected to a hydraulic accumulator.
  • the effective in the stroke direction (extension of the cylinder) pressure is thus determined by the constant pump and the effective pressure in the opposite direction by the pressure in the hydraulic accumulator.
  • the direction of rotation is reversed via the control of the fixed displacement pump, so that pressure fluid from the cylinder chamber is flowed into the tank and the cylinder moves in through the pressure in the hydraulic accumulator or annulus and the weight of the load.
  • the fixed displacement pump works as a motor and the electric motor as a generator, so that the power gained can be fed back into the grid.
  • a problem with the known hydraulic drives is that for a quick extension of the cylinder, a comparatively large pump is required. When pressure build-up in the hydraulic cylinder, a large restoring torque is generated at this large pump, so that the variable-speed drive must be designed so that it can muster the appropriate torque.
  • Such strong electric motors are very expensive and require a considerable volume of construction. Furthermore, the losses in such strong electric motors are relatively large, so that one endeavors to use the smallest possible engines.
  • the invention has the object of developing a hydraulic drive for one of a pumping arrangement and a hydraulic accumulator pressurized with consumers such that in a compact low-cost construction, a fast extension movement is possible.
  • valve arrangement over which both pumps are connected to the consumer at low consumer pressure and when a threshold pressure, the pump with the larger displacement is switched to pressureless circulation or the like, so that only the smaller pump effective is.
  • Internal gear pumps are preferably used for the pumps of the pumping arrangement.
  • the hydraulic drive according to the invention can be used particularly advantageously for a bending cylinder of a bending press.
  • the single FIGURE shows a circuit diagram of a hydraulic drive according to the invention for a bending press.
  • a bending press 1 has a double-acting bending cylinder 2, via which a clamped on a machine bed workpiece 4 can be acted upon with the force required for bending.
  • the bending cylinder 2 is a run as an open circuit hydraulic drive with a pumping arrangement 6 and a hydraulic accumulator 8 assigned.
  • pressure medium can be sucked from a tank T and conveyed via a pressure line 10 into a bottom-side cylinder chamber 12 of the bending cylinder 2.
  • the hydraulic accumulator 8 is connected via a storage line 14 with a piston rod side annular space 16 of the bending cylinder 2.
  • the pumping arrangement 6 has a variable-speed drive 18, so that for extending the bending cylinder 2 towards the workpiece 4, pressure medium from the tank T is conveyed via the pump arrangement 6, the pressure line 10 into the cylinder space 12. This effective in the extension direction pressure of the pressure in the hydraulic accumulator 8 corresponding pressure in the annular space 16 counteracts.
  • the direction of rotation of the pump assembly 6 is reversed via the variable-speed drive 18, so that pressure fluid flows from the cylinder chamber 12 via the pumping arrangement 6 to the tank.
  • the pressure in the hydraulic accumulator 8 then acts in the retraction direction, so that the piston of the bending cylinder 2 is retracted.
  • the pumping arrangement 6 acts as a motor, so that correspondingly the drive 18, for example an asynchronous motor, acts as a generator.
  • the stroke position of the bending cylinder 2 is detected by a displacement sensor 20, so that in response to its signal, the drive of the drive 18 can be carried out.
  • the storage line 14 and the pressure line 10 are connected to one another via a bypass line 22.
  • a bypass line 22 In this bypass line an adjustable throttle device 24 is arranged.
  • the bypass line 22 is further connected via a pressure relief valve 26 to the tank T.
  • the pressure in the hydraulic accumulator 8 is set to a predetermined, relatively low limit.
  • a check valve 28 In the bypass line 22 is still still still a check valve 28 is provided, which opens in the direction of the storage line 14.
  • This check valve 28 prevents pressure fluid from entering the pressure cylinder 10 from the annulus 16 or from the hydraulic accumulator 8 when the bending cylinder 2 retracts and thus the hydraulic accumulator 8 is discharged - in this case the bending cylinder 2 would stop or slow its return movement.
  • the throttle device 24 is formed in the bypass line 22 as a flow control valve (not shown) via which the pressure medium volume flow flowing to the storage line 14 is independent of the pressure difference in the pressure line 10 and in the storage line 14.
  • the hydraulic accumulator 8 is preceded by a safety valve 30.
  • a pressure medium flow for charging the hydraulic accumulator 8 can be diverted from the pressure line 10 during operation of the bending press, so that it is ensured that it is always charged to the predetermined limit.
  • the pressure relief valve 26 opens upon reaching this limit and thus a low pressure medium flow over the Bypass line 22 is formed toward the tank T out, the pump assembly 6 must be operated at a slightly higher speed than is the case with the solutions without bypass line. By this speed increase, a pressure pulsation of the pump is reduced, so that a uniform extension movement of the bending cylinder 2 is ensured.
  • the pump assembly 6 consists of two coupled pumps, which are each designed as a constant pump.
  • the left in the figure pump, hereinafter referred to as small pump 31, is designed with a comparatively small displacement, while the other, large pump 32 is designed with a comparatively large displacement.
  • Both pumps 31, 32 are coupled together and are driven by the variable speed drive 18.
  • the pressure port of the small pump 31 is connected via a high-pressure pump line 34 to the pressure line 10.
  • a pump pressure limiting valve 36 is arranged that opens a connection to the tank T out when a maximum pressure in the high-pressure pump line 34 is exceeded, so that the pressure supplied by the small pump 31 is limited to this maximum value.
  • From the high-pressure pump line 34 further branches off a Nachsaugtechnisch 38, in which a closing in the direction of the tank T out check valve 40 is arranged.
  • the large pump 32 is connected via a low-pressure pump line 42 and a switching valve 44 to the pressure line 10.
  • This switching valve 44 opens in its spring-biased home position, the connection between the low-pressure pump line 42 and the pressure line 10. A counter to the force of a spring 46 acting control surface of the switching valve 44 is acted upon via a control line 48 with the pressure in the pressure line 10.
  • the switching valve 44 is switched to a switching position in which the low-pressure pump line 42 is connected to the tank T - the large pump 32 is then also connected without pressure circulation. Similar to the small pump 31, the pressure of the large pump 32 is limited to a maximum value via another pump pressure limiting valve 50. From the low-pressure pump line 42 branches off a further Nachsaug effet 52 with check valve 54 from.
  • both pumps 31, 32 are driven by the variable-speed drive 18.
  • the switching valve 44 is in its basic position, so that the pressure medium flows of both pumps 31, 32 are added and conveyed via the pressure line 10 into the cylinder chamber 12.
  • the bending cylinder 2 extends at a comparatively high speed and in the cylinder chamber 12, a corresponding pressure builds up.
  • the switching valve 44 is switched to its second switching position, so that the low-pressure pump line 42 is connected to the tank T. From this threshold pressure promotes only the small pump 31 pressure fluid to the bending cylinder 2. That is, to hold the stroke position of the bending cylinder 2 and to build the maximum pressures only the smaller pump 30 is used, so that at such high pressures acting on the return torque is comparatively low and according to the drive 18 can be designed with less torque.
  • bypass line 22 with the associated valve arrangement designed as an independent component.
  • this bypass line 22 in the hydraulic cylinder 2.
  • the bypass line 22 for example, pass through the piston, so that by this bypass line with the integrated throttle (24) of the cylinder chamber (12) and the annular space (16) are connected.
  • a hydraulic drive for a consumer preferably for a double-acting cylinder whose pressure chamber is supplied via a pump arrangement with variable-speed drive with pressure medium, while an effective in the opposite direction of the pressure chamber of a hydraulic accumulator is acted upon.
  • the pumping arrangement has two pumps with different stroke volumes, which are driven by the common variable-speed drive, wherein at high pressures on the consumer only the pump with a lower displacement is effective, so that the drive can be designed with relatively small torque.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
EP04029899.4A 2002-08-02 2003-07-10 Hydraulischer Antrieb Expired - Lifetime EP1564414B1 (de)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE10235631 2002-08-02
DE10235631 2002-08-02
DE10329067A DE10329067A1 (de) 2002-08-02 2003-06-27 Hydraulischer Antrieb
DE10329067 2003-06-27
EP20030015768 EP1387090B1 (de) 2002-08-02 2003-07-10 Hydraulischer Antrieb

Related Parent Applications (3)

Application Number Title Priority Date Filing Date
EP20030015768 Division EP1387090B1 (de) 2002-08-02 2003-07-10 Hydraulischer Antrieb
EP20030015768 Division-Into EP1387090B1 (de) 2002-08-02 2003-07-10 Hydraulischer Antrieb
EP03015768.9 Division 2003-07-10

Publications (2)

Publication Number Publication Date
EP1564414A1 EP1564414A1 (de) 2005-08-17
EP1564414B1 true EP1564414B1 (de) 2017-06-14

Family

ID=30128713

Family Applications (1)

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EP04029899.4A Expired - Lifetime EP1564414B1 (de) 2002-08-02 2003-07-10 Hydraulischer Antrieb

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DE102005043367B4 (de) 2005-09-12 2016-09-08 Laeis Gmbh Steuervorrichtung und Steuerverfahren für eine Kolben-Zylinder-Anordnung
DE102008039011B4 (de) 2008-08-21 2020-01-16 MAE Maschinen- u. Apparatebau Götzen GmbH Druckspeicherlose hydraulische Antriebsanordnung sowie Verfahren zum druckspeicherlosen hydraulischen Antreiben eines Verbrauchers
DE102009058408A1 (de) * 2009-07-09 2011-01-13 Robert Bosch Gmbh Elektrohydraulische Steuerung
DE102009052531A1 (de) 2009-11-11 2011-05-12 Hoerbiger Automatisierungstechnik Holding Gmbh Maschinenpresse
DE102011011750A1 (de) 2011-02-18 2012-08-23 MAE Maschinen- u. Apparatebau Götzen GmbH Druckspeicherlose hydraulische Antriebsanordnung für und mit einem Verbraucher, insbesondere für Pressen sowie Verfahren zum Betreiben einer solchen druckspeicherlosen hydraulischen Antriebsanordnung
DE102011015903B4 (de) 2011-04-01 2021-12-16 Robert Bosch Gmbh Pumpenanordnung
DE102013000725B4 (de) 2013-01-17 2024-02-08 Robert Bosch Gmbh Elektrohydraulische Steuerung
CN111425469B (zh) * 2020-03-30 2022-07-26 安徽东海机床制造有限公司 一种弯板随动托料液压系统及其控制方法
CN115255097A (zh) * 2022-08-16 2022-11-01 曼弗莱德智能制造(江苏)有限公司 一种冲压模具用的节能型液压机及节能方法

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US6379119B1 (en) * 1995-05-16 2002-04-30 Globemag L-P Hybrid electric and hydraulic actuation system

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US6379119B1 (en) * 1995-05-16 2002-04-30 Globemag L-P Hybrid electric and hydraulic actuation system

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ES2640347T3 (es) 2017-11-02
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