EP2600012A2 - Système hydraulique - Google Patents

Système hydraulique Download PDF

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Publication number
EP2600012A2
EP2600012A2 EP20120008005 EP12008005A EP2600012A2 EP 2600012 A2 EP2600012 A2 EP 2600012A2 EP 20120008005 EP20120008005 EP 20120008005 EP 12008005 A EP12008005 A EP 12008005A EP 2600012 A2 EP2600012 A2 EP 2600012A2
Authority
EP
European Patent Office
Prior art keywords
pressure
main control
control valves
hydraulic
valves
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.)
Granted
Application number
EP20120008005
Other languages
German (de)
English (en)
Other versions
EP2600012A3 (fr
EP2600012B1 (fr
Inventor
Simon Meier
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.)
Liebherr Hydraulikbagger GmbH
Original Assignee
Liebherr Hydraulikbagger 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 Liebherr Hydraulikbagger GmbH filed Critical Liebherr Hydraulikbagger GmbH
Publication of EP2600012A2 publication Critical patent/EP2600012A2/fr
Publication of EP2600012A3 publication Critical patent/EP2600012A3/fr
Application granted granted Critical
Publication of EP2600012B1 publication Critical patent/EP2600012B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F15B18/00—Parallel arrangements of independent servomotor systems
    • 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
    • F15B13/07—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors in distinct sequence
    • 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
    • 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
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/329—Directional control characterised by the type of actuation actuated by fluid pressure
    • 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
    • F15B2211/78—Control of multiple output members
    • F15B2211/783—Sequential control
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7758—Pilot or servo controlled
    • Y10T137/7762—Fluid pressure type

Definitions

  • the present invention relates to a hydraulic system with at least two main control valves and with a hydraulic pilot control system for controlling the main control valves.
  • the object of the present invention is to provide a simpler and more reliable system.
  • the hydraulic system according to the invention comprises at least two main control valves and a hydraulic pilot control system for controlling the main control systems.
  • the hydraulic pilot control system and / or the main control valves are constructed such that the at least two main control valves open in succession.
  • the system can be constructed such that the at least two main control valves open at different control pressures of a common control transmitter. This also makes it possible, in a hydraulically piloted multi-circuit system, to realize a cascade circuit in which the main control valves open in a certain sequence.
  • the main control valves can be used to control one or more consumers.
  • the cascade connection can be realized via mechanically and / or hydraulically differently designed main control valves.
  • the at least two main control valves can be equipped with springs of different spring force, so that the main control valves open by the different spring force at different control pressures.
  • the spring of a first main control valve may open in a first control pressure range while the spring of a second main control valve opens in a second control pressure range.
  • the main control valves can be constructed identically.
  • the at least two main control valves may have different valve rods and / or valve housings, which lead to an opening of the at least two main control valves at different strokes.
  • the opening starts of the main control valves are set mechanically differently on the valve rods or the valve housings. This can be done for example in the form of grooves or holes on the valve rods.
  • a cascade circuit can be created without corresponding circuit logic by valve hardware.
  • the valves open so at different stroke and thus at different control pressure.
  • At least one of the main control valves is acted upon by a back pressure, which counteracts the control pressure.
  • a back pressure which counteracts the control pressure.
  • the same effect can be achieved as by an increased spring strength, since the back pressure is added to the spring pressure and must be overcome only by the control pressure to lead to an opening of the main control valve.
  • the back pressure can be constant.
  • a corresponding pressure source is provided for this purpose.
  • cascade circuit can also be implemented by a corresponding configuration of the pilot control unit.
  • identical main control valves can be used.
  • At least one of the main control valves is controlled via a pressure reducing valve whose output pressure is controlled via the control pressure for another main control valve.
  • another control pressure for the one main control valve can be generated via the pressure reducing valve.
  • the pressure reducing valve can have a pressure ratio not equal to 1 between control pressure and output pressure, so that the output pressure for controlling the one main control valve is in a fixed ratio to the control pressure for the other main control valve.
  • At least one of the main control valves is acted upon via a pressure shut-off valve with a counter control pressure, which counteracts the control pressure.
  • the pressure shut-off valve is acted upon by the control pressure, so that the counter-control pressure rises to a shut-off pressure with the control pressure. This also makes it possible to achieve a later start of opening in the case of the main control valve, which is acted upon by the counter-control pressure.
  • a first main control valve can be actuated via a pressure-reducing valve, while a second main control valve is acted upon by a counter-pressure via a pressure shut-off valve.
  • more than one pressure-reducing valve or more than one pressure shut-off valve can be used in a cascade connection via the pilot control unit, which then work correspondingly with different pressure ratios or with different shut-off pressures.
  • the hydraulic system according to the invention has a common control transmitter, via which the at least two main control valves can be actuated.
  • this control transmitter can generate a control pressure for driving the at least two main control valves.
  • the inventive design of the main control valves and the pilot unit then ensures despite the common control transmitter for different opening starts of the main control valves.
  • the hydraulic system according to the invention further comprises a common high-pressure supply for supplying the at least two main control valves with hydraulic pressure on.
  • the high-pressure supply thereby comprises a variable-displacement pump, which is controlled as required by the connected consumer or consumers.
  • the cascading of the opening starts according to the invention allows the use of such a pressure supply despite hydraulic pilot control.
  • variable displacement pump is controlled via a load-sensing arrangement.
  • variable displacement pump is controlled so that a certain pressure drop is maintained over all main control valves, and at the same time a maximum pressure is not exceeded.
  • a subsequent summation for controlling the load-sensing arrangement takes place.
  • the at least two main control valves can be supplied with hydraulic pressure via at least two separate high-pressure supplies, in particular via separate variable displacement pumps.
  • the cascade control according to the invention ensures that at low flow rates required only one of the two main control valves opens and thus only one of the two hydraulic pumps is used to supply the consumer or consumers. If more power is needed, opens the other main control valve, so that the second hydraulic pump is used for supply.
  • variable displacement pumps are each controlled via a load-sensing arrangement.
  • system according to the invention can also be used with more than two main control valves and / or more than two separate high-pressure supplies.
  • the at least two main control valves control separate consumers.
  • two hydraulic cylinders can be controlled via the two control valves.
  • the two hydraulic cylinders can be used for successive extension or retraction of different elements, eg. for telescoping or telescoping telescopic slides.
  • one or more hydraulic pumps can be used for the pressure supply.
  • the at least two main control valves control the same consumer. This is particularly advantageous if the required maximum control quantity is not made available via a single main control valve.
  • the two main control valves are particularly advantageously supplied with hydraulic fluid via separate hydraulic pumps.
  • the pressure supply can also take place via only one hydraulic pump.
  • the present invention further includes, besides the hydraulic system, a pilot control system as described above.
  • a pilot control system which implements the cascade circuit according to the invention hydraulically.
  • a pressure-reducing valve and / or a pressure shut-off valve can be used to control at least one of the main control valves.
  • the present invention comprises a set of at least two main control valves for a hydraulic system, as described above.
  • the main control valves are designed mechanically and / or hydraulically different.
  • the two main control valves in this case, springs with different spring force, and / or mechanically differently processed valve rods or valve housing, which lead to an opening start at different stroke.
  • pilot control system or the set of at least two main control valves are designed as described in more detail above.
  • the present invention further comprises a hydraulically powered implement having a hydraulic system as described above.
  • it is a mobile working device.
  • the present invention is used in construction, earthmoving and / or handling equipment.
  • the present invention comprises a hydraulic excavator with a hydraulic system according to the invention.
  • the implement may include at least two separate hydraulic pumps for supplying consumers of the implement with hydraulic fluid, wherein the at least two main control valves are supplied separately from the at least two separate hydraulic pumps with hydraulic pressure.
  • the two main control valves supply the same consumer with hydraulic fluid.
  • the consumer which is acted upon by hydraulic pressure from both main control valves, can be a slewing gear, a chassis and / or a hydraulic cylinder, in particular for lifting and / or moving a jib or tool.
  • the two main control valves can also be used to supply two separate consumers with hydraulic fluid.
  • the at least two consumers may be, for example, a slewing gear, a running gear and / or hydraulic cylinders for lifting and / or moving a jib or a tool.
  • the embodiments of the present invention relate to a hydraulic system with two main control valves, in particular as part of an LS multi-circuit system with downstream summation, which are operated hydraulically piloted.
  • a cascade circuit is provided according to the invention, through which the hydraulic control slide used as the main control valves are opened in a certain sequence.
  • the control of the system is carried out via a common pilot control 2, in particular a control handle, via which a desired control pressure for pilot control is generated.
  • the pilot control device may be, for example, a joystick.
  • the pilot controller 1 can via a pilot pressure source 15, as shown for example in FIG. 3 is shown, are acted upon by a constant pilot pressure and reduces this to the desired control pressure.
  • the constant pilot pressure can be, for example, 35 bar.
  • the hydraulic system according to the invention now allows by its mechanical or hydraulic structure, despite this common control, a cascading of the opening times.
  • the cascade connection can be realized via different valve springs of the main control valves, or via different slide opening starts of the main control valves.
  • a hydraulic cascade pilot control unit may be provided, so that the cascade connection takes place via the pilot control.
  • valve springs 6 and 7 of the two main spool 2 and 3 are chosen so that z. B. the spring of the slider 2 in a first pressure range and the spring of the slider 3 in a second pressure range responds.
  • the spring 6 of the slider 2 may be chosen so that it responds in a pressure range between 0 and 20 bar, while the spring 7 of the slider 3 of 20 to 35 bar responds. Due to the different valve springs so different opening starts are achieved.
  • a pressure source or corresponding circuit 9 may be provided, which this subjected to a back pressure.
  • the valve 3 is acted upon by the counter control pressure port 8 with a counter control pressure from the circuit 9, wherein the back pressure is advantageously constant.
  • the same spring strength as the slider 2 can be used, which is now reinforced via the pressure source 9, since the back pressure adds to the spring pressure.
  • the spring strength for the valve 3 may also be between 0 and 20 bar and be amplified by 10 bar from the pressure source 9.
  • the opening starts of the main spool 2 'and 3' are set mechanically different on the valve rods 10 and 11. This can be done depending on the manufacturer of the primary slide in the form of grooves or holes. As a result, a cascade circuit can be created without appropriate circuit logic by slider hardware.
  • both pistons 10 and 11 thus have the same stroke 12
  • the piston of the main control valve 2 'already opens after a short distance, while the piston of the main control valve 3' opens later only at the stroke 13.
  • valve springs 6 'and 7' can also be made identical in this embodiment, so that the different opening starts only by the mechanical configuration of the valve rods. Alternatively, this could also be done by another mechanical configuration of the valve housing.
  • the cascade circuit realized via a corresponding configuration of the pilot valve unit.
  • the main spool 2 'and 3' can be used unchanged.
  • FIG. 3 again combined two different variants, which, however, can also be used individually.
  • a pressure reducing valve 16 may be provided, which is acted upon by the constant pilot pressure from the pilot pressure source 15.
  • the pressure reducing valve 16 is acted upon by the control pressure 17 of the pilot control 1 and has a certain pressure ratio x, so that at the pressure outlet 18 of the pressure reducing valve 16, the x-times the control pressure 17 is applied.
  • the first main control valve 2 ' is acted upon by the actual control pressure 17, the second main control valve 3' with the changed control pressure 18 of the pressure reducing valve.
  • On the piston 5 of the main control valve 3 'thus acts x times the control transmitter predetermined control pressure, while acting on the piston 4 of the main control valve 2' the simple control transmitter 1 predetermined control pressure.
  • a pressure shut-off valve 19 may be provided, which is acted upon by the control pressure from the pilot pressure transducer 1 and has a defined cut-off pressure.
  • a back pressure is exerted on the piston 4 of the main control valve 2 '. Therefore, as long as the control pressure is below the shut-off pressure of the shut-off valve 19, acts on both sides a and b of the main control valve 2 ', the same pressure, so that it stops in the neutral position.
  • the pressure for both main control valves could in each case via pressure reducing valves with different pressure ratio, or via Druckabschaltventile with different cut-off pressure.
  • FIGS. 4a to 4d four exemplary embodiments for the use of the cascade circuit according to the invention with one or more hydraulic pumps and / or one or more consumers are shown.
  • Fig. 4a Both main control valves 2 and 3 are completely connected in parallel. They are supplied by a common hydraulic pump 30 and control the same load 40.
  • Fig. 4b the two main control valves 2 and 3 are connected in parallel only with regard to the pump side. They are therefore powered by a common hydraulic pump 30, but control separate consumers 41 and 42 at.
  • Fig. 4c the two main control valves 2 and 3 are connected in parallel only with regard to the consumer side. They are therefore supplied by two separate hydraulic pumps 31 and 32, but drive the same load 40 at.
  • Fig. 5 an embodiment is shown in which more than two main control valves 50 to 53 are each supplied separately from the hydraulic pumps 31 to 34 on the pump side, but drive the same load 40.
  • the hydraulic system is designed so that the more than two main control valves 50 to 53 open or close in a defined order.
  • the present invention makes it possible, in particular in the case of a high-pressure supply of a multicircuit system via a load-sensing control with a downstream summation, to operate the main control valves hydraulically piloted and still achieve a cascade connection.
  • Hydraulic systems according to the invention can be used in particular in mobile working machines, such as, for example, a hydraulic excavator.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Operation Control Of Excavators (AREA)
EP12008005.6A 2011-12-01 2012-11-28 Système hydraulique Active EP2600012B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201110119945 DE102011119945A1 (de) 2011-12-01 2011-12-01 Hydrauliksystem

Publications (3)

Publication Number Publication Date
EP2600012A2 true EP2600012A2 (fr) 2013-06-05
EP2600012A3 EP2600012A3 (fr) 2016-12-21
EP2600012B1 EP2600012B1 (fr) 2020-04-01

Family

ID=47080126

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12008005.6A Active EP2600012B1 (fr) 2011-12-01 2012-11-28 Système hydraulique

Country Status (5)

Country Link
US (1) US9897115B2 (fr)
EP (1) EP2600012B1 (fr)
CN (1) CN103133450B (fr)
DE (1) DE102011119945A1 (fr)
RU (1) RU2599698C2 (fr)

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None

Also Published As

Publication number Publication date
DE102011119945A1 (de) 2013-06-06
RU2012151537A (ru) 2014-06-10
US9897115B2 (en) 2018-02-20
RU2599698C2 (ru) 2016-10-10
CN103133450A (zh) 2013-06-05
EP2600012A3 (fr) 2016-12-21
EP2600012B1 (fr) 2020-04-01
US20130139909A1 (en) 2013-06-06
CN103133450B (zh) 2017-04-12

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