WO2009062484A1 - Hydrauliksteuerkreis zur übersteuerung eines drehwerkantriebes - Google Patents
Hydrauliksteuerkreis zur übersteuerung eines drehwerkantriebes Download PDFInfo
- Publication number
- WO2009062484A1 WO2009062484A1 PCT/DE2008/001861 DE2008001861W WO2009062484A1 WO 2009062484 A1 WO2009062484 A1 WO 2009062484A1 DE 2008001861 W DE2008001861 W DE 2008001861W WO 2009062484 A1 WO2009062484 A1 WO 2009062484A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- valves
- hydraulic
- control
- control circuit
- slewing gear
- Prior art date
Links
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
- 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
- F15B11/044—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the return line, i.e. "meter out"
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/84—Slewing gear
- B66C23/86—Slewing gear hydraulically actuated
-
- 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
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/3056—Assemblies of multiple valves
- F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-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
- F15B2211/30—Directional control
- F15B2211/31—Directional control characterised by the positions of the valve element
- F15B2211/3105—Neutral or centre positions
- F15B2211/3111—Neutral or centre positions the pump port being closed in the centre position, e.g. so-called closed centre
-
- 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
- F15B2211/355—Pilot pressure control
-
- 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
-
- 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
- F15B2211/42—Flow control characterised by the type of actuation
- F15B2211/428—Flow 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
- F15B2211/40—Flow control
- F15B2211/46—Control of flow in the return line, i.e. meter-out control
-
- 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
- F15B2211/635—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements
- F15B2211/6355—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements having valve 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
- F15B2211/70—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
- F15B2211/7058—Rotary 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
- F15B2211/715—Output members, e.g. hydraulic motors or cylinders or control therefor having braking 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
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/755—Control of acceleration or deceleration of the output member
Definitions
- Hydraulic control circuit for overriding a slewing gear drive
- the invention relates to a hydraulic control circuit for overriding the control of a hydraulic motor for driving a slewing gear or hoist or Einziehhubwerks a crane truck.
- a turning device is referred to as a device in which a crane superstructure with a corresponding boom can rotate freely on a fixed undercarriage.
- the drive is via a hydraulic motor, which in turn arbitrarily positioned via a gearbox with a corresponding translation of the superstructure to the undercarriage.
- the rotational movement must be able to be controlled very slowly on the one hand, and on the other hand to reach high speeds in order to enable corresponding work cycles.
- the dynamic properties of the lathe system vary widely, depending on boom lengths, payloads and load weights.
- the requirements for operation of the crane are also determined by the operations on the construction sites. This requires a high degree of controllability through resolution and conversion.
- the slewing gear controls usually used in mobile cranes are designed as "closed and open circuits.” Within the “open circuits”, volume-flow or pressure-controlled systems are used.
- Oil is sent directly to the pump. Leakage is fed by another auxiliary pump in the respective return side.
- the speed of the rotary movement is determined by the delivery volume of the pump.
- the control valves in the pump regulate the quantity as required.
- the conveying direction and thus also the direction of rotation of the slewing gear is also determined by the pump.
- the mechanical / hydraulic valve system allows the Pivoting adjustment of the pump from a maximum position on the zero position to the other maximum position and thus to switch continuous flow from one output to another. At the same time, the suction sides on the pump also change.
- An advantage of this control principle lies in the clamping of the slewing gear, the conditionally prevents a rotation with lateral forces, since the hydraulic motor on the pump and thus the diesel engine is supported.
- the clamping of the slewing mechanism by the "closed circle” causes an immediate retardation of the rotational speed when the control is withdrawn, and an increased attention of the driver to the rotational movement is required.
- a constant displacement pump typically delivers oil from the tank through a proportional valve to the slew motor.
- the direction of rotation and flow to the slew motor are determined by the valve, both controlled by proportional signals as required ,
- the proportional valves can work as throttle valves or as pressure compensator valves, whereby then a flow control is guaranteed regardless of the pressure.
- a hydraulic control circuit has been proposed for a hydraulic system controlling a drive, in particular for controlling a hydraulic motor for driving a slewing gear of a crane truck, characterized by in the two working lines between a hydraulic constant pump and a hydraulic motor for controlling the slewing gear arranged, separately controllable proportional pilot valves, and each separately controllable proportional directional control valves by means of the inflow and outflow to and from the hydraulic motor and thus the direction of rotation can be controlled.
- a failure of the energy required to control the directional valves means an uncontrollable further rotation due to the inertia of a revolving stage in rotation or starting the rotational movement due to unequal load distribution of a sleeper at rest. Both the uncontrollable further rotation and the beginning of an unwanted rotational movement pose a security risk.
- the invention has the object of providing a hydraulic circuit in such a way that even in the case of partial or complete failure of the control of slewing, hoist or Einziehhubwerk the operator of the machine slow down the slewing gear, hoist or Einziehhubwerk and can finally stop.
- the essential components of the present control concept include the following components:
- the slewing drive is described in only one direction of rotation, the opposite direction is carried out accordingly.
- the control of the slewing motor 5 via the inlet piston 3.2 The inlet piston specifies the direction of rotation and the rotational speed of the slew motor. It is assumed in this embodiment that the oil flow from the pump 2 via the inlet piston 3.2, the pressure line 3.9 to the motor 5 flows. The flowing back from the engine 5 oil then flows through the pressure lines 3.10 to the
- the directional valve is designed such that a control pressure in 3.17 or 3.18 is required to throttle the flow and close. Without control pressure give the
- the control pressure is generated electroproportionally by the pilot valves 3.3 and 3.4 respectively.
- the pilot valve 3.4 is energized, so that 3.18 remains closed.
- the drain-side pilot valve 3.3 is (partially) energized so that 3.5 (partially) is open and the
- the spring-loaded directional control valve 3.5 opens the drain.
- the slewing in freewheel it is no longer subject to the control of the operator on the controls, eg. B. joystick 9, which is shown in the block diagram of Figure 2.
- the spring-loaded opening of the directional valve ensures that there is no abrupt braking of the slewing gear. This would under certain conditions (high moment of inertia) pose a threat to the system.
- valve 6 By operating the valve 6, for example via a foot brake pedal 8, the operator according to the present invention can now build up a control pressure in 3.11 and 3.12. This causes the control valves 3.7 and 3.8 in 3.17 and 3.18 to build up a control pressure that throttles both directional control valves 3.5 and 3.6.
- the throttling is proportional to the constructed control pressure. As a result, the rotational movement is decelerated, a free rotation of the revolving stage is prevented.
- the slewing clutch override according to the present invention can also be used as a dynamic service brake for a given full operating range.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES08851023T ES2402547T3 (es) | 2007-11-14 | 2008-11-07 | Circuito de control hidráulico para la sobremodulación de un accionamiento de un mecanismo de giro |
US12/743,094 US8689549B2 (en) | 2007-11-14 | 2008-11-07 | Hydraulic control circuit for overcontrol of a slewing gear drive |
CN2008801158180A CN101878370B (zh) | 2007-11-14 | 2008-11-07 | 用于对一个回转机构驱动装置进行过调制的液压控制回路 |
JP2010533428A JP5649449B2 (ja) | 2007-11-14 | 2008-11-07 | 旋回装置駆動装置をオーバーライドするための油圧制御回路 |
EP08851023A EP2225471B1 (de) | 2007-11-14 | 2008-11-07 | Hydrauliksteuerkreis zur übersteuerung eines drehwerkantriebes |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007055001 | 2007-11-14 | ||
DE102007055001.6 | 2007-11-14 | ||
DE102008034028A DE102008034028A1 (de) | 2007-11-14 | 2008-07-17 | Hydrauliksteuerkreis zur Übersteuerung eines Drehwerkantriebes |
DE102008034028.6 | 2008-07-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2009062484A1 true WO2009062484A1 (de) | 2009-05-22 |
Family
ID=40577223
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2008/001861 WO2009062484A1 (de) | 2007-11-14 | 2008-11-07 | Hydrauliksteuerkreis zur übersteuerung eines drehwerkantriebes |
Country Status (7)
Country | Link |
---|---|
US (1) | US8689549B2 (de) |
EP (1) | EP2225471B1 (de) |
JP (1) | JP5649449B2 (de) |
CN (1) | CN101878370B (de) |
DE (1) | DE102008034028A1 (de) |
ES (1) | ES2402547T3 (de) |
WO (1) | WO2009062484A1 (de) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102092647A (zh) * | 2011-02-14 | 2011-06-15 | 上海三一科技有限公司 | 一种用于履带起重机回转微动控制的液压系统 |
WO2014063490A1 (zh) * | 2012-10-26 | 2014-05-01 | 中联重科股份有限公司 | 控制臂架回转的液压系统及其控制方法和混凝土泵送设备 |
DE102016002613A1 (de) * | 2016-03-03 | 2017-09-07 | Liebherr-Werk Ehingen Gmbh | Hydrauliksteuerkreis für ein Krandrehwerk |
EP3290386A1 (de) * | 2016-08-30 | 2018-03-07 | Putzmeister Engineering GmbH | Hydraulischer drehwerksantrieb |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011101921A1 (de) * | 2011-05-18 | 2012-11-22 | Linde Material Handling Gmbh | Hydraulische Bremsventileinrichtung |
US10850076B2 (en) | 2012-10-26 | 2020-12-01 | Urotronic, Inc. | Balloon catheters for body lumens |
JP6156871B2 (ja) * | 2013-07-12 | 2017-07-05 | キャタピラー エス エー アール エル | 作業車両 |
JP6776590B2 (ja) * | 2016-04-08 | 2020-10-28 | 株式会社タダノ | クレーン |
JP6693842B2 (ja) * | 2016-09-08 | 2020-05-13 | 住友重機械建機クレーン株式会社 | クレーン |
JP6923413B2 (ja) | 2017-10-10 | 2021-08-18 | 住友重機械建機クレーン株式会社 | 作業機械 |
CN112709730B (zh) * | 2021-01-06 | 2023-06-23 | 武汉船用机械有限责任公司 | 一种回转机构的闭式液压控制系统及其使用方法 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US1205272A (en) | 1916-03-14 | 1916-11-21 | Alois Scherber | Heater for curling-irons. |
JPS6011704A (ja) * | 1983-07-01 | 1985-01-22 | Hitachi Constr Mach Co Ltd | 油圧コントロ−ルバルブのスプ−ル制御装置 |
US20030079532A1 (en) * | 2001-10-29 | 2003-05-01 | Masayoshi Mototani | Oil pressure signal output device |
US20050205272A1 (en) * | 2003-12-01 | 2005-09-22 | Kazuyuki Suzuki | Hydraulic control apparatus for work machines |
DE102006040459A1 (de) | 2005-09-07 | 2007-03-08 | Terex-Demag Gmbh & Co. Kg | Hydrauliksteuerkreis |
Family Cites Families (5)
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JP2630777B2 (ja) * | 1987-07-10 | 1997-07-16 | カヤバ工業株式会社 | 車両用制御回路 |
JPH02275103A (ja) * | 1989-04-17 | 1990-11-09 | Hitachi Constr Mach Co Ltd | 作業装置用油圧回路 |
JP3195989B2 (ja) * | 1990-12-31 | 2001-08-06 | 帝人製機株式会社 | クローラ車両走行油圧回路 |
US7162869B2 (en) * | 2003-10-23 | 2007-01-16 | Caterpillar Inc | Hydraulic system for a work machine |
JP4558465B2 (ja) * | 2003-12-01 | 2010-10-06 | 株式会社小松製作所 | 建設機械の油圧制御装置 |
-
2008
- 2008-07-17 DE DE102008034028A patent/DE102008034028A1/de not_active Withdrawn
- 2008-11-07 JP JP2010533428A patent/JP5649449B2/ja active Active
- 2008-11-07 ES ES08851023T patent/ES2402547T3/es active Active
- 2008-11-07 CN CN2008801158180A patent/CN101878370B/zh active Active
- 2008-11-07 US US12/743,094 patent/US8689549B2/en active Active
- 2008-11-07 WO PCT/DE2008/001861 patent/WO2009062484A1/de active Application Filing
- 2008-11-07 EP EP08851023A patent/EP2225471B1/de active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1205272A (en) | 1916-03-14 | 1916-11-21 | Alois Scherber | Heater for curling-irons. |
JPS6011704A (ja) * | 1983-07-01 | 1985-01-22 | Hitachi Constr Mach Co Ltd | 油圧コントロ−ルバルブのスプ−ル制御装置 |
US20030079532A1 (en) * | 2001-10-29 | 2003-05-01 | Masayoshi Mototani | Oil pressure signal output device |
US20050205272A1 (en) * | 2003-12-01 | 2005-09-22 | Kazuyuki Suzuki | Hydraulic control apparatus for work machines |
DE102006040459A1 (de) | 2005-09-07 | 2007-03-08 | Terex-Demag Gmbh & Co. Kg | Hydrauliksteuerkreis |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102092647A (zh) * | 2011-02-14 | 2011-06-15 | 上海三一科技有限公司 | 一种用于履带起重机回转微动控制的液压系统 |
WO2014063490A1 (zh) * | 2012-10-26 | 2014-05-01 | 中联重科股份有限公司 | 控制臂架回转的液压系统及其控制方法和混凝土泵送设备 |
DE102016002613A1 (de) * | 2016-03-03 | 2017-09-07 | Liebherr-Werk Ehingen Gmbh | Hydrauliksteuerkreis für ein Krandrehwerk |
US10196246B2 (en) | 2016-03-03 | 2019-02-05 | Liebherr-Werk Ehingen Gmbh | Hydraulic control circuit for crane slewing gear |
DE102016002613B4 (de) | 2016-03-03 | 2022-09-29 | Liebherr-Werk Ehingen Gmbh | Hydrauliksteuerkreis für ein Krandrehwerk |
EP3290386A1 (de) * | 2016-08-30 | 2018-03-07 | Putzmeister Engineering GmbH | Hydraulischer drehwerksantrieb |
WO2018041856A1 (de) | 2016-08-30 | 2018-03-08 | Putzmeister Engineering Gmbh | Hydraulischer drehwerksantrieb und mobile betonpumpe mit einem solchen drehwerksantrieb |
Also Published As
Publication number | Publication date |
---|---|
EP2225471A1 (de) | 2010-09-08 |
JP5649449B2 (ja) | 2015-01-07 |
JP2011503475A (ja) | 2011-01-27 |
ES2402547T3 (es) | 2013-05-06 |
DE102008034028A1 (de) | 2009-05-28 |
US20100313555A1 (en) | 2010-12-16 |
CN101878370A (zh) | 2010-11-03 |
US8689549B2 (en) | 2014-04-08 |
CN101878370B (zh) | 2013-11-20 |
EP2225471B1 (de) | 2013-01-09 |
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