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WO2011060639A1 - Dispositif de commande de commutation pour des vérins de flèche de grue - Google Patents

Dispositif de commande de commutation pour des vérins de flèche de grue Download PDF

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Publication number
WO2011060639A1
WO2011060639A1 PCT/CN2010/074275 CN2010074275W WO2011060639A1 WO 2011060639 A1 WO2011060639 A1 WO 2011060639A1 CN 2010074275 W CN2010074275 W CN 2010074275W WO 2011060639 A1 WO2011060639 A1 WO 2011060639A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
cylinder
reversing valve
port
oil
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.)
Ceased
Application number
PCT/CN2010/074275
Other languages
English (en)
Chinese (zh)
Inventor
张铁军
刘丹杰
禹阳华
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.)
Hunan Sany Intelligent Control Equipment Co Ltd
Sany Automobile Manufacturing Co Ltd
Original Assignee
Hunan Sany Intelligent Control Equipment Co Ltd
Sany Automobile Manufacturing Co Ltd
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 Hunan Sany Intelligent Control Equipment Co Ltd, Sany Automobile Manufacturing Co Ltd filed Critical Hunan Sany Intelligent Control Equipment Co Ltd
Publication of WO2011060639A1 publication Critical patent/WO2011060639A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/18—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors used in combination for obtaining stepwise operation of a single controlled member
    • 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
    • B66C23/72—Counterweights or supports for balancing lifting couples
    • B66C23/78—Supports, e.g. outriggers, for mobile cranes
    • B66C23/80—Supports, e.g. outriggers, for mobile cranes hydraulically actuated
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2203—Arrangements for controlling the attitude of actuators, e.g. speed, floating function
    • 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
    • F15B2211/70—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
    • F15B2211/7121—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators the chambers being connected in series

Definitions

  • the utility model relates to a crane arm cylinder switching control device.
  • the application is submitted to the Chinese Patent Office on November 20, 2009, and the application number is 200920270403.2.
  • the utility model name is "a boom arm cylinder switching control device”. The entire contents of which are incorporated herein by reference.
  • the utility model relates to the field of machinery, in particular to a boom cylinder switching control device. Background technique
  • the control design of the boom is an important and critical part in the design of truck cranes.
  • the telescopic expansion of the truck crane boom is generally accomplished by the expansion and contraction of the cylinder.
  • the extension of the 5-arm cylinder is usually achieved by combining the two cylinders with the rope row.
  • the control of the truck crane boom cylinder is the guarantee of the safety and reliability of the truck crane during the work and transportation.
  • the control of the boom cylinder ensures the safety within the working range of the boom.
  • the control of the boom cylinder ensures the safety and reliability of the boom in emergency situations such as sudden braking.
  • Fig. 1 is the hydraulic pressure of the boom cylinder control device in the prior art.
  • Schematic By using the prior art boom cylinder control device, when a main reversing valve fails during the operation of the truck crane or during the whole vehicle operation, the expansion and contraction of the cylinder controlled by the main reversing valve will be out of control. The safety and reliability of the boom are not guaranteed.
  • Utility model content The embodiment of the utility model provides a boom arm cylinder switching control device, which realizes switching control of two cylinders of a truck crane boom, and ensures the safety and reliability of the boom.
  • the embodiment of the present invention provides a boom cylinder switching control device, comprising: a cylinder (1), a cylinder (2), and a main reversing valve (3), wherein
  • the small cavity of the oil cylinder (1) communicates with the small cavity of the oil cylinder (2), the A port of the main reversing valve (3) is connected with the small cavity of the oil cylinder (1), and the B port and the oil cylinder of the main reversing valve (3) are connected.
  • the large chamber connection, the B port of the main reversing valve (3) is connected to the large cavity of the cylinder (2).
  • the main reversing valve (3) is,
  • the cylinder (1) is a telescopic cylinder
  • the cylinder (2) is a telescopic cylinder.
  • the utility model further comprises a two-way cartridge valve (7), a heart tube (10), a balance valve (11), and a heart tube (10) passing through the oil cylinder (1), which is distributed with the same axis of the oil cylinder (1), the heart tube One end of (10) is connected to the two-way cartridge valve (7), and the other end is connected to the balancing valve (11);
  • the B port of the main reversing valve (3) is connected to the large chamber of the cylinder (2) through the two-way cartridge valve (7), the heart tube (10) and the balancing valve (11).
  • the two-way cartridge valve (8) and the balancing valve (12) are also included.
  • the B port of the main reversing valve (3) is connected to the large chamber of the cylinder (1) through the two-way cartridge valve (8) and the balancing valve (12).
  • the reversing valve (9) is a P-type three-position four-way reversing valve, the reversing valve (9) is connected with the two-way cartridge valve (7), and the reversing valve (9) is connected with the two-way cartridge valve (8) .
  • An oil inlet of the shuttle valve (5) is connected to the A port of the main reversing valve (3), and the other oil inlet of the shuttle valve (5) is connected to the B port of the main reversing valve (3), and the shuttle valve ( 5)
  • the oil outlet is connected to the reversing valve (9);
  • the reversing valve (9) takes oil from the A port of the main reversing valve (3) through the shuttle valve (5), and the reversing valve (9) is taken from the B port of the main reversing valve (3) through the shuttle valve (5). oil.
  • the solenoid valve (4) is connected to the small cavity of the cylinder (1).
  • the solenoid valve (6) is installed between the two-way cartridge valve (7) and the core tube (10).
  • the embodiment of the present invention has the following advantages:
  • a 0-type neutral function main control valve is used to realize switching control of two cylinders of the boom, ensuring the operation process of the boom In the middle, or in the process of the whole vehicle, the safety and control of the cylinder is ensured, which ensures the safety and reliability of the crane boom.
  • FIG. 1 is a hydraulic schematic diagram of a boom cylinder control device in the prior art
  • FIG. 2 is a hydraulic schematic diagram of a boom cylinder switching control device according to an embodiment of the present invention
  • the utility model provides a boom arm cylinder switching control device, as shown in FIG. 2 As shown, including, the cylinder 1, the cylinder 2, the main reversing valve 3, wherein
  • Oil red 1 is a telescopic oil red
  • oil red 2 is a telescopic oil red.
  • the two-way cartridge valve 7 the heart tube 10, the balance valve 11,
  • the heart tube 10 passes through the cylinder 1 and is distributed with the same axis of the cylinder 1.
  • One end of the core tube 10 is connected to the two-way cartridge valve 7, and the other end is connected to the balancing valve 11.
  • the B port of the main reversing valve 3 is connected to the large chamber of the cylinder 2 through the two-way cartridge valve 7, the core tube 10 and the balancing valve 11 in sequence.
  • a two-way cartridge valve 8 and a balancing valve 12 are also included, a two-way cartridge valve 8 and a balancing valve 12,
  • the B port of the main reversing valve 3 is connected to the large chamber of the cylinder 1 through the two-way cartridge valve 8 and the balancing valve 12 in sequence.
  • the reversing valve 9 is a P-type three-position four-way reversing valve, the reversing valve 9 is connected to the two-way cartridge valve 7, and the reversing valve 9 is connected to the two-way cartridge valve 8.
  • An oil inlet of the shuttle valve 5 is connected to the A port of the main reversing valve 3, and the other oil inlet of the shuttle valve 5 is connected to the B port of the main reversing valve 3, and the oil outlet and the reversing valve of the shuttle valve 5 9 connection;
  • the reversing valve 9 takes oil from the port A of the main reversing valve 3 through the shuttle valve 5
  • the reversing valve 9 takes oil from the port B of the main reversing valve 3 through the shuttle valve 5 for the cylinder 1 and the cylinder 2 switching control.
  • the solenoid valve 4 is connected to the small cavity of the cylinder 1 for controlling the release of the pressure oil in the small chamber of the cylinder 1 and the release of the pressure oil in the small chamber of the cylinder 2.
  • the solenoid valve 6 is installed between the two-way cartridge valve 7 and the core tube 10 for controlling the residual oil discharge in the large chamber of the cylinder 2.
  • a boom cylinder switching control device provided by an embodiment of the present invention, a 0-type medium-function main control valve is used to realize switching control of two cylinders of the automobile boom, thereby ensuring the operation of the boom. In the process, or during the driving process of the vehicle, the safety and control of the cylinder are ensured, which ensures the safety and reliability of the crane boom.
  • the utility model provides a boom arm cylinder switching control device, which realizes switching control of two oil cylinders.
  • the hydraulic principle of the boom cylinder cylinder switching control is shown in FIG. 2, including: oil red 1, oil red 2 Main reversing valve 3, solenoid valve 4, shuttle valve 5, solenoid valve 6, two-way cartridge valve 7, two-way cartridge valve 8, reversing valve 9, heart tube 10, balancing valve 11 and balancing valve 12.
  • oil red 1 is a telescopic oil red
  • oil red 2 is a telescopic oil red
  • the main reversing valve 3 is a 0-type neutral function reversing valve, the P port of the main reversing valve 3 is connected to the oil pump, and the T port of the main reversing valve 3 is connected to the oil tank; the small cavities of the oil cylinder 1 and the cylinder 2 are connected to each other through the rubber hose.
  • the port A of the main reversing valve 3 is connected to the small chamber of the cylinder 1.
  • the B port of the main reversing valve 3 is connected to the two-way cartridge valve 7, and the B port of the main reversing valve 3 is connected to the two-way cartridge valve 8; wherein the B port of the main reversing valve 3 is connected to the two-way cartridge valve 7, B port pressure oil is supplied to the large cavity of the cylinder 2 through the two-way cartridge valve 7, the core tube 10 in the cylinder 1, and the balance valve 11; the B port of the main reversing valve 3 is connected to the two-way cartridge valve 8, The B port pressure oil supplies oil to the large cavity of the cylinder 1 through the two-way cartridge valve 8 and the balance valve 12; the heart tube 10 passes through the cylinder 1 and is distributed with the same axis of the cylinder 1, and one end of the core tube 10 and the two-way insertion The valve 7 is connected, and the other end of the core tube 10 is connected to the balancing valve 11.
  • the two-way cartridge valve 7 is connected to the reversing valve 9, the two-way cartridge valve 8 is connected to the reversing valve 9, the reversing valve 9 is a P-type three-position four-way reversing valve, and the reversing valve 9 is in two-way insertion
  • the closing of the valve 7 and the two-way cartridge valve 8 is controlled, so that the pressure oil of the control port B enters the cylinder 2 and the cylinder 1 through the two-way cartridge valve 7 and the two-way cartridge valve 8, thereby realizing the cylinder 1 and the cylinder 2 Switching control;
  • one inlet port of the shuttle valve 5 is connected to the A port of the main reversing valve 3, and the other inlet port of the shuttle valve 5 is connected to the B port of the main reversing valve, and the oil outlet of the shuttle valve 5 is
  • the reversing valve 9 is connected, and the reversing valve 9 takes oil from the A port and the B port of the main reversing valve 9 through the shuttle valve 5,
  • the solenoid valve 4 is connected to the small cavity of the cylinder 1, and the small cavity of the cylinder 1 is connected with the small cavity of the cylinder Therefore, the solenoid valve 4 is connected to the small cavity of the cylinder 2, and the solenoid valve 4 is used for controlling the release of the pressure oil in the small chamber of the cylinder 1, and the release of the pressure oil in the small chamber of the cylinder 2.
  • the solenoid valve 6 is installed between the two-way cartridge valve 7 and the core tube 10 for controlling the residual oil discharge in the large chamber of the cylinder 2.
  • the main reversing valve 3 When the cylinder 2 is required to extend, the main reversing valve 3 is operated to the left position, the port B of the main reversing valve 3 is connected to the oil pump, and the oil pump inputs the pressure oil to the oil passage through the port B, and the DT4 of the reversing valve 9 is energized.
  • the reversing valve 9 is operated in the right position, the upper chamber of the two-way cartridge valve 7 is turned on, the upper chamber control oil is released, the inlet and outlet ports of the two-way cartridge valve 7 are turned on; the pressure oil is controlled by the main reversing valve 3
  • the B port flows through the two-way cartridge valve 7, the heart tube 10, and the balance valve 11 into the large cavity of the cylinder 2, and pushes the cylinder 2 to extend under the action of the pressure oil, and the residual oil in the large cavity of the cylinder 2 passes through the solenoid valve 6
  • the pressure oil enters the large cavity of the cylinder 2, pushing the cylinder 2 to extend, and the pressure oil in the small cavity of the cylinder 2 is returned to the oil tank through the A port.
  • the main reversing valve 3 is operated in the left position, and the DT4 of the reversing valve 9 is energized to complete the extension of the cylinder 2.
  • the main reversing valve 3 When the cylinder 1 is required to extend, the main reversing valve 3 is operated to the left position, and the B port of the main reversing valve 3 is connected to the oil pump, so that the DT3 of the reversing valve 9 is energized, the reversing valve 9 is operated to the left position, and the two-way insertion is performed.
  • the upper chamber of the valve 8 is turned on, the upper chamber control oil is released, the inlet and outlet of the two-way cartridge valve 8 are turned on, and the pressure oil flows from the B port of the main reversing valve 3 through the two-way cartridge valve 8, the balance valve 12 enters the large cavity of the cylinder 1, and pushes the cylinder 1 to extend.
  • the main reversing valve 3 is operated in the left position, and the DT3 of the reversing valve 9 is energized to complete the extension of the cylinder 1.
  • the main reversing valve 3 When the cylinder 2 is required to be retracted, the main reversing valve 3 is operated in the right position, and the port A of the main reversing valve 3 is connected to the oil pump, and the pressure oil passes through the small port of the cylinder 1 through the port A and enters the small cavity of the cylinder 2, at which time
  • the DT4 of the valve 9 is energized, the reversing valve 9 is operated in the right position, the upper chamber of the two-way cartridge valve 7 is turned on, the upper chamber control oil is released, and the inlet and outlet ports of the two-way cartridge valve 7 are turned on;
  • the large cavity pressure oil of 2 is returned to the oil tank through the balance valve 11, the heart tube 10, the two-way cartridge valve 7, and the B port of the main reversing valve 3; the pressure oil enters the cylinder 2 through the A port of the main reversing valve 3 In the small cavity, the large cavity pressure oil in the cylinder 2 is returned to the oil tank, and the cylinder 2 is
  • the main reversing valve 3 is operated in the right position, and the DT4 of the reversing valve 9 is energized to complete the retracting action of the cylinder 2.
  • the main reversing valve 3 is operated in the right position, the port A of the main reversing valve 3 is connected to the oil pump, and the pressure oil enters the small chamber of the cylinder 1 through the port A, and the DT3 of the reversing valve 9 is electrified.
  • the reversing valve 9 is operated in the left position, the upper chamber of the two-way cartridge valve 8 is turned on, the upper chamber control oil is released, the inlet and outlet ports of the two-way cartridge valve 8 are turned on; the large chamber pressure oil of the cylinder 1 is The balance valve 12 and the two-way cartridge valve 8 are returned to the oil tank through the B port of the main reversing valve 3; the pressure oil enters the small cavity of the cylinder 1 through the A port of the main reversing valve 3, and the large chamber pressure in the cylinder 1 The oil returns to the tank and the cylinder 1 is retracted.
  • the main reversing valve 3 is operated in the right position, and the DT3 of the reversing valve 9 is energized to complete the retracting action of the cylinder 1.
  • the small cavity of the cylinder 1 When the small cavity of the cylinder 1 is required to be depressurized, since the small cavity of the cylinder 1 and the small cavity of the cylinder 2 communicate with each other through the hose, according to the fluidity of the pressure oil, when the small cavity of the cylinder 1 is relieved, it is also The cylinder 2 performs pressure relief; the solenoid valve 6 is energized, and the pressure oil in the cylinder 1 and the small chamber of the cylinder 2 is led back to the tank. The solenoid valve 6 is energized, and the pressure relief of the pressure oil in the small chambers of the cylinder 1 and the cylinder 2 is completed.
  • the main control valve 3 When the truck crane is in the whole vehicle running state, in order to ensure that the cylinder pushes the boom uncontrolled extension during the sudden braking or turning, the main control valve 3 is returned to the neutral position, and the reversing valve is 9 times. Positioning work; main reversing valve 3 back to the middle position, the main port directional valve 3 A and B stop to deliver pressure oil to the cylinder 1 and the cylinder 2, the cylinder 1 and the cylinder 2 large cavity and small cavity are locked; The valve 9 is returned to the neutral position, the two-way cartridge valve 7 and the two-way cartridge valve 8 are closed, and the pressure oil is stopped from being supplied to the cylinder 1 and the cylinder 2; in addition, when the pressure oil enters the cylinder 1, it passes through the balancing valve 12, When the pressure oil enters the cylinder 2, the balance valve 11 is passed, and the balance valve 11 and the balance valve 12 act as a hydraulic buffer and a hydraulic pressure adjustment in the oil passage, and double-protect the cylinder lock. Therefore, the safety and reliability of the
  • a switching control device for a boom cylinder provided by an embodiment of the present invention, a 0-type medium function main control valve is used to realize switching control of two cylinders of the boom, ensuring operation at the boom In the process, or during the driving process of the vehicle, the safety and control of the cylinder are ensured, which ensures the safety and reliability of the crane boom.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

L'invention porte sur un dispositif de commande de commutation pour des vérins d'une flèche de grue, lequel dispositif comprend un premier vérin à huile (1), un second vérin à huile (2) et un robinet inverseur principal (3). La petite cavité du premier vérin à huile (1) communique avec la petite cavité du second vérin à huile (2). L'orifice A du robinet inverseur principal (3) est relié à la petite cavité du premier vérin à huile (1). L'orifice B du robinet inverseur principal (3) est relié respectivement aux grandes cavités du premier vérin à huile (1) et du second vérin à huile (2). Le dispositif de commande réalise une commande de commutation pour deux vérins à huile d'une flèche de grue. Il en résulte qu'il est garanti que les vérins à huile sont sûrs et qu'ils peuvent être commandés durant le procédé de fonctionnement de la flèche de grue ou durant le procédé de fonctionnement de la totalité du véhicule.
PCT/CN2010/074275 2009-11-20 2010-06-22 Dispositif de commande de commutation pour des vérins de flèche de grue Ceased WO2011060639A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200920270403.2 2009-11-20
CN2009202704032U CN201560071U (zh) 2009-11-20 2009-11-20 一种起重臂油缸切换控制装置

Publications (1)

Publication Number Publication Date
WO2011060639A1 true WO2011060639A1 (fr) 2011-05-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2010/074275 Ceased WO2011060639A1 (fr) 2009-11-20 2010-06-22 Dispositif de commande de commutation pour des vérins de flèche de grue

Country Status (2)

Country Link
CN (1) CN201560071U (fr)
WO (1) WO2011060639A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103343760A (zh) * 2013-07-28 2013-10-09 安徽柳工起重机有限公司 一种起重机吊臂切换阀

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3990583A (en) * 1973-08-23 1976-11-09 Kabushiki Kaisha Komatsu Seisakusho Device for controlling the boom elevation of a side crane
DE3324270A1 (de) * 1983-07-06 1985-01-24 Montanhydraulik GmbH, 4755 Holzwickede Teleskopierzylinder-system
CN1086789A (zh) * 1992-11-08 1994-05-18 铁道部兰州机车工厂 起重机单钩双卷扬液压驱动系统
US6029559A (en) * 1998-04-06 2000-02-29 Grove U.S. L.L.C. Telescoping system with multiple single-stage telescopic cylinders
JP2009150462A (ja) * 2007-12-20 2009-07-09 Caterpillar Japan Ltd 作業機械における油圧制御システム
CN201325841Y (zh) * 2008-12-19 2009-10-14 上海三一科技有限公司 一种履带起重机臂架防后倾高低压切换液压系统

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3990583A (en) * 1973-08-23 1976-11-09 Kabushiki Kaisha Komatsu Seisakusho Device for controlling the boom elevation of a side crane
DE3324270A1 (de) * 1983-07-06 1985-01-24 Montanhydraulik GmbH, 4755 Holzwickede Teleskopierzylinder-system
CN1086789A (zh) * 1992-11-08 1994-05-18 铁道部兰州机车工厂 起重机单钩双卷扬液压驱动系统
US6029559A (en) * 1998-04-06 2000-02-29 Grove U.S. L.L.C. Telescoping system with multiple single-stage telescopic cylinders
JP2009150462A (ja) * 2007-12-20 2009-07-09 Caterpillar Japan Ltd 作業機械における油圧制御システム
CN201325841Y (zh) * 2008-12-19 2009-10-14 上海三一科技有限公司 一种履带起重机臂架防后倾高低压切换液压系统

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