EP2094915B1 - Hydraulic system for improving flatting workability in an excavator - Google Patents

Hydraulic system for improving flatting workability in an excavator Download PDF

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Publication number
EP2094915B1
EP2094915B1 EP07851716.6A EP07851716A EP2094915B1 EP 2094915 B1 EP2094915 B1 EP 2094915B1 EP 07851716 A EP07851716 A EP 07851716A EP 2094915 B1 EP2094915 B1 EP 2094915B1
Authority
EP
European Patent Office
Prior art keywords
boom
control valve
switched
pilot line
directional control
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.)
Not-in-force
Application number
EP07851716.6A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2094915A1 (en
EP2094915A4 (en
Inventor
Yong-Chae Kim
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.)
Hyundai Doosan Infracore Co Ltd
Original Assignee
Doosan Infracore Co Ltd
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Filing date
Publication date
Application filed by Doosan Infracore Co Ltd filed Critical Doosan Infracore Co Ltd
Publication of EP2094915A1 publication Critical patent/EP2094915A1/en
Publication of EP2094915A4 publication Critical patent/EP2094915A4/en
Application granted granted Critical
Publication of EP2094915B1 publication Critical patent/EP2094915B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36—Component parts
    • E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
    • E02F3/43—Control of dipper or bucket position; Control of sequence of drive operations
    • E02F3/435—Control of dipper or bucket position; Control of sequence of drive operations for dipper-arms, backhoes or the like
    • E02F3/437—Control of dipper or bucket position; Control of sequence of drive operations for dipper-arms, backhoes or the like providing automatic sequences of movements, e.g. linear excavation, keeping dipper angle constant
    • 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
    • E02F9/14—Booms only for booms with cable suspension arrangements; Cable suspensions
    • 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
    • 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
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • E02F9/2239—Control of flow rate; Load sensing arrangements using two or more pumps with cross-assistance
    • 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
    • E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
    • E02F9/2267—Valves or distributors
    • 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
    • E02F9/2278—Hydraulic circuits
    • E02F9/2285—Pilot-operated systems
    • 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
    • E02F9/2278—Hydraulic circuits
    • E02F9/2292—Systems with two or more 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
    • 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
    • F15B13/021—Valves for interconnecting the fluid chambers of an actuator
    • 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
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/0401—Valve members; Fluid interconnections therefor
    • F15B2013/0413—Valve members; Fluid interconnections therefor with four or more positions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/3056—Assemblies of multiple valves
    • F15B2211/3059—Assemblies of multiple valves having multiple valves for multiple output members
    • F15B2211/30595—Assemblies of multiple valves having multiple valves for multiple output members with additional valves between the groups of valves for multiple output members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3122—Special positions other than the pump port being connected to working ports or the working ports being connected 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
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3122—Special positions other than the pump port being connected to working ports or the working ports being connected to the return line
    • F15B2211/3133—Regenerative position connecting the working ports or connecting the working ports to the pump, e.g. for high-speed approach stroke
    • 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
    • F15B2211/321—Directional control characterised by the type of actuation mechanically
    • F15B2211/324—Directional control characterised by the type of actuation mechanically manually, e.g. by using a lever or pedal
    • 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
    • F15B2211/327—Directional control characterised by the type of actuation electrically or electronically
    • 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
    • F15B2211/30—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
    • F15B2211/60—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

Definitions

  • the present invention relates to a hydraulic system according to the preamble of claim 1 which is known from EP 0 436 740 A1 .
  • US 3 604 313 discloses a hydraulic circuit for the operation of a boom of a construction machine which includes a four-position boom control valve for controlling the position that the boom hydraulic actuator may assume during operations.
  • US 2003/230082 A1 discloses a hydraulic system comprising a first and second pump, a boom cylinder which drives a boom, first and second control valves including boom-up side ports hydraulically connected to a boom-up pilot line, the hydraulic operating fluid passing through the first and second boom control valves being joined and supplied to the boom cylinder when the boom is lifted.
  • the flatting work of a plain or inclined ground is carried out as a part of compacting work after the ground is leveled.
  • a bucket of the excavator is pulled, while pressing the ground in the state in which a flat part of the bucket is in contact with the ground, thereby pressing and simultaneously flattening the ground, similarly ironing clothes with iron.
  • the flatting work is carried out by combined operation of a boom, an arm and a bucket with pressing the ground and simultaneously pulling the arm in the state in which the flat part of the bucket is in contact with the ground, which is essential work for making a flatly pressed surface in the plain or inclined ground
  • the force pressing the ground must be uniform to some extent. Meanwhile, if the ground is pressed with excessive or non-uniform force, the pressing work causes a problem with uniformity in flatness of the ground.
  • the force pressing the ground is determined by mechanical force applied to the bucket through the combined operation of the boom, the arm and the bucket. However, it is not easy to properly apply the mechanical force to the ground. This can be realized only by skilled operation of a joystick of the excavator. Further, in addition to the application of the uniform force, the flat part of the bucket must be continuously in contact with the ground.
  • the boom, the arm and the bucket of the excavator are operated by the joystick.
  • the typical joystick of the excavator is provided with a swing lever for swinging a body of the excavator and an arm lever for dump/crowd operation of the arm, which are installed on one side within driver's reach, and a lever for up/down operation of the boom and a lever for dump/crowd operation of the bucket, which are installed on the other side within driver's reach.
  • the results of the work are dependent on how properly the joystick is operated.
  • an object of the present invention is to provide a hydraulic system for an excavator, which enables even an unskilled operator, who is short of skill or technique of the operation of equipment, to easily perform flatting work on a plain or inclined ground.
  • the present invention provides a hydraulic system for an excavator according to independent claim 1.
  • the fourth position of the boom control valve is located at one outermost port of the boom control valve, and the stopper is connected to the other outermost port of the boom control valve and supplies a predetermined hydraulic pressure to the other outermost port so as to restrict the boom control valve from being switched to the fourth position.
  • the first position of the directional control switch corresponds to a position that is indicated by Mode 1 in FIGS. 3 and 4 , which is for the excavating work. Further, the second position of the directional control switch corresponds to a position that is indicated by Mode 2 in FIGS. 3 and 4 , which is for the flatting work.
  • the boom control valve in order to allow the ordinary excavating work to be carried out even if the directional control switch is switched so as to select the flatting work position, the boom control valve is switched up to the fourth position only when the boom-up side port thereof has pressure equal to or greater than a preset reference pressure, and is switched only to one of the first, second and third positions when the pressure of the boom-up side port is less than the reference pressure.
  • the reference pressure is set to pressure occurring at the boom-up side port when an operator operates an operating lever beyond a predetermined displacement or angle in a direction where the boom is lifted.
  • the hydraulic system for the excavator which is structurally improved so as to easily perform flatting work, can be applied to a two-pump hydraulic system having two pumps.
  • the hydraulic system of the present invention further comprises means for interrupting the connection of the boom-up pilot line and the second boom control valve.
  • One example of the interrupting means includes a second directional control valve, which can be switched between a first position where the boom-up pilot line is connected with the second boom control valve and a second position where the boom-up pilot line is disconnected from the second boom control valve.
  • the hydraulic system according to an example of the present invention further comprises a directional control switch for switching the first directional control valve and the second directional control valve.
  • the two-pump hydraulic system can be also designed so that, in order to allow the ordinary excavating work to be carried out even if the directional control switch is switched so as to select the flatting work position, when the directional control switch is switched to a first position, the first boom control valve is switched up to the fourth position only when the boom-up side port thereof has pressure equal to or greater than a preset reference pressure, and is switched only to one of the first, second and third positions when the pressure of the boom-up side port is less than the reference pressure.
  • FIG. 1 is a schematic view illustrating configuration of a boom control valve 22 and its peripheral attachments in an ordinary excavator having a boom, an arm and a bucket.
  • a boom control valve 22 can be switched to one of three positions: one for lifting a boom 24, one for maintaining neutrality of the boom 24, and one for lowering the boom 24, when viewed from the left side.
  • FIG. 2 is a schematic view illustrating configuration of a boom control valve 22 and its peripheral attachments in an excavator according to an embodiment of the present invention.
  • the boom control valve 22 has a first position for maintaining neutrality of a boom 24, a second position for lifting the boom 24, a third position for lowering the boom 24, and a fourth position for allowing the boom 24 to be lifted and lowered by self-weight or external force.
  • the boom control valve 22 can be switched to one of the four positions.
  • the boom control valve 22 can be operated by a boom-up pilot signal Pi and a boom down pilot signal, which are generated by manipulation of a joystick of an excavator operator (see FIG. 5 ).
  • the flatting work can be done by operating only the bucket and arm in the state in which the boom control valve is fixed to a preset position, i.e. the fourth position.
  • the boom control valve is fixed to the fourth position, the arm is stretched to the maximum extent, and thereby the bucket is located at a place remotest from a body of the excavator, as illustrated in FIGS. 7 and 8 .
  • a flat outer surface of the bucket is controlled to be parallel to the ground.
  • an arm controlling joystick is controlled toward a crowd side, so that the flatting work is naturally carried out while the arm is pulled.
  • the bucket must be controlled such that the flat outer surface thereof is parallel to the ground.
  • the flat outer surface of the bucket has only to be minutely controlled while performing simple operation of pulling the arm (arm crowd operation), the flatting work can be easily carried out.
  • the hydraulic system comprises a stopper 11, which controls the boom control valve 22 to prevent from being arbitrarily switched to the fourth position.
  • the boom control valve 22 is further provided with the stopper 11 on one side thereof which restricts the boom control valve 22 from being switched to the fourth position so as to allow the boom control valve 22 to be switched only to one of the first, second and third positions.
  • the boom control valve 22 has the fourth position adjacent to a boom-up side port thereof, that is, one outermost port thereof, and the stopper 11 is connected to another outermost port, that is, a boom-down side port.
  • the application of a predetermined hydraulic pressure to the stopper restricts the boom control valve 22 from being switched to the fourth position.
  • the hydraulic system of the present invention can further comprise a first directional control valve 8 for controlling the stopper.
  • the hydraulic system further comprises a gear pump 9, and a pilot line Pi2 connecting the stopper 11 and the gear pump 9.
  • the first directional control valve can be installed on the pilot line Pi2.
  • the hydraulic system of the present invention can further comprise a directional control switch 20.
  • a work mode is determined by the directional control switch.
  • the boom control valve 22 can be adapted to be switched to the fourth position. In the other cases, the boom control valve 22 can be adapted to be not switched to the fourth position.
  • the directional control switch 20 can be selectively switched to one of a first position (Mode 1) and a second position (Mode 2) by manipulation of an operator.
  • the directional control switch is provided in a knob shape at a predetermined position within a cab (not shown), and is electrically connected with the solenoid-type first directional control valve 8 as described below as well as a second directional control valve 10 in the next embodiment, which will be described below.
  • the first position of the directional control switch 20 refers to a position where the first directional control valve 8 is switched to the first position so as to allow the stopper 11 to communicate with the gear pump 9 through the pilot line Pi2.
  • the second position of the directional control switch 20 refers to a position where the first directional control valve 8 is switched to the second position so as to allow the pilot line Pi2 to communicate with a tank T.
  • the stopper 11 releases its function, so that the boom control valve 22 can be switched to the fourth position.
  • the first position of the directional control switch 20 corresponds to a position that is indicated by Mode 1 in FIGS. 3 and 4 , which is for the excavating work.
  • the second position of the directional control switch 20 corresponds to a position that is indicated by Mode 2 in FIGS. 3 and 4 , which is for the flatting work.
  • the directional control switch 20 may be adapted to carry out the ordinary excavating work.
  • a boom-up side hydraulic line Pi of the boom control valve 22 has pressure equal to and greater than a preset reference pressure, for instance 26k
  • the boom control valve 22 can be adapted to be switched to the fourth position.
  • a first boom control valve is adapted to be switched only to one of the first, second and third positions so as to be able to carry out the ordinary excavating work.
  • the pressure occurring when the operator pulls the operation lever of the joystick at a displacement of 10 mm in the direction where the boom is lifted can be set to become the preset reference pressure of the hydraulic line.
  • the first boom control valve can be adapted to be switched only to one of the first, second and third positions.
  • the first boom control valve can be adapted to be switched to one of the first through fourth positions.
  • FIG. 3 is a hydraulic circuit diagram illustrating a two-pump hydraulic system having two pumps according to an example of the present invention.
  • FIG. 4 schematically illustrates the first boom control valve 1 and its peripheral attachments in the hydraulic circuit diagram of FIG. 3 .
  • FIG. 5 is a hydraulic circuit diagram illustrating a joystick that is an operating device of the excavator.
  • the hydraulic system illustrated in FIG. 3 comprises first and second pumps P1 and P2, a control valve section 21, an arm crowd pilot line Pac, a boom-up pilot line Pi, a first directional control valve 8, and a second directional control valve 10.
  • control valve section 21 includes first and second boom control valves 2 and 3, first and second arm control valves 4 and 5, and other valves such as a straight traveling control valve, a left/right turning control valve, an option control valve and a swing control valve.
  • first and second boom control valves 2 and 3 first and second arm control valves 4 and 5, and other valves such as a straight traveling control valve, a left/right turning control valve, an option control valve and a swing control valve.
  • other valves such as a straight traveling control valve, a left/right turning control valve, an option control valve and a swing control valve.
  • first boom control valve 2 and the second arm control valve 5 communicate with the first pump P1 through a center parallel line Ps.
  • the second boom control valve 3 and the first arm control valve 4 communicate with the second pump P2 through another center parallel line Ps.
  • Hydraulic operating fluid passing through the second boom control valve 3 joins that passing through the first boom control valve 2 via a predetermined path A8', and then is supplied to a boom cylinder.
  • boom-up side ports of the first and second boom control valves 2 and 3 are hydraulically connected to each other through the boom-up pilot line Pi. Further, it can be found that the boom-up side ports of the first and second boom control valves 2 and 3 are hydraulically connected to each other such that the hydraulic operating fluids passing through the first and second boom control valves 2 and 3 can be joined when the boom is lifted.
  • the first boom control valve 2 has a first position for maintaining neutrality of the boom, a second position for lifting the boom, a third position for lowering the boom, and a fourth position for allowing the boom 24 to be freely lifted and lowered by self-weight or external force.
  • the first boom control valve 2 can be switched to one of the four positions.
  • a neutral position is a position where inlet and outlet of the boom cylinder are closed.
  • the hydraulic system comprises a stopper 11, which restricts the first boom control valve 2 from being switched to the fourth position so as to allow the first boom control valve 2 to be switched only to one of the first, second and third positions. More specifically, the first boom control valve 2 has the fourth position adjacent to one outermost port thereof, and the stopper 11 is connected to the other outermost port. The application of a predetermined hydraulic pressure to the other port of the first boom control valve restricts the first boom control valve from being switched to the fourth position.
  • the stopper 11 is installed on the boom-down side port of the first boom control valve 2.
  • the hydraulic system illustrated in FIGS. 3 and 4 can further comprise a gear pump 9, a pilot line Pi2 connecting the stopper 11 and the gear pump 9, and a first directional control valve 8, which is installed on the pilot line Pi2 and is switched between a first position where the pilot line Pi2 communicates with the gear pump 9 and a second position where the pilot line Pi2 communicates with a tank.
  • the stopper functions to prevent the first boom control valve from being switched to the fourth position when the first directional control valve 8 is switched to the first position, the communicating position.
  • the first boom control valve 2 can be switched to the fourth position.
  • the hydraulic operating fluid can be supplied to the boom cylinder through the second boom control valve 3.
  • the hydraulic system can employ a method of blocking the boom-up pilot line Pi applied to the second boom control valve 3 during the flatting work.
  • the two-pump hydraulic system can further comprise means for interrupting the connection of the boom-up pilot line Pi and the second boom control valve 3.
  • This interrupting means includes the second directional control valve 10.
  • the second directional control valve 10 can be adapted to be switched between a first position where the boom-up pilot line Pi is connected with the second boom control valve 3 and a second position where the boom-up pilot line Pi is disconnected from the second boom control valve 3.
  • the hydraulic system can further comprise a directional control switch 20, which switches the first directional control valve 8 and the second directional control valve 10.
  • the directional control switch 20 can be adapted to be selectively switched to one of: a first position where it switches the first directional control valve 8 to the first position and causes the stopper 11 to communicate with the gear pump 9 through the pilot line Pi2 such that the stopper 11 is functionally activated to restrict the first boom control valve 2 from being switched to the fourth position, and where it switches the second directional control valve 10 to the first position and causes the second boom control valve 3 to communicate with the boom-up pilot line Pi such that the first boom control valve 2 and the second boom control valve 3 can be switched in the diction where the boom is lifted; and a second position where it switches the first directional control valve 8 to the second position and causes the pilot line Pi2 to communicate with the tank T so that the stopper 11 is functionally inactivated to allow the first boom control valve 2 to be switched up to the fourth position, and where it switches the second directional
  • the directional control switch 20 can be hydraulically and electrically connected with the first and second directional control valves 8 and 10.
  • FIG. 4 the connection of the first boom control valve 2 of the present invention is illustrated in detail.
  • the first boom control valve 2 is connected with the boom-up pilot line Pi on the left side thereof, and is provided with the stopper 11 on the right side thereof.
  • the stopper 11 can communicate with the first directional control valve 8 at the first position of the first directional control valve 8, and thus can be supplied with the hydraulic operating fluid from the gear pump 9.
  • the pressure oil discharged from the first pump P1 flows through the center parallel line Ps, and the hydraulic operating fluid is supplied to the boom cylinder in response to the switching of the first boom control valve 2.
  • the excavator can be adapted to perform the ordinary excavating work.
  • the boom control valve 22 can be adapted to be switched to the fourth position.
  • the first boom control valve is adapted to be switched only to one of the first, second and third positions so as to be able to carry out the ordinary excavating work.
  • the first boom control valve can be adapted to be switched only to one of the first, second and third positions, but when the displacement is more than 10 mm, the first boom control valve can be adapted to be switched to one of the first through fourth positions.
  • This method of operating the boom-up joystick in order to switch the first boom control valve 2 to the fourth position can be changed to the case in which the boom 24 is operated in a lowering direction. In this case, the boom 24 will be operated in a manner such that it is lowered by its self-weight while being lowered.
  • the first directional control valve 8 When the operator switches the directional control switch 20 to the second position, which corresponds to the flatting work mode, for the purpose of the flatting work, the first directional control valve 8 is switched to the second position, and the pilot line Pi2 communicates with the tank T. As a result, the stopper 11 is functionally inactivated, and thus the first boom control valve 2 can be switched up to the fourth position. Further, the second directional control valve 10 is switched to the second position, thereby allowing the boom-up pilot line Pi of the second boom control valve 3 to communicate with the tank T, so that the second boom control valve 3 is not switched. At this time, when the first boom control valve 2 is switched to the fourth position, the inlet and outlet ports of the boom cylinder 23 communicate with each other.
  • the front including the boom is lowered by its self-weight, and the flat surface of the bucket comes into contact with the ground, so that pressing action occurs. Subsequently, when the arm is pulled in a crowd direction, the self-weight of the front is applied to the ground, so that the flatting work is realized as in FIGS. 7 and 8 .
  • the hydraulic characteristics of the boom control valves 2 and 3 can be divided into two stages, as illustrated in FIG. 6 , such that the operation thereof can be changed.
  • the first boom control valve 2 can be switched to one of the first, second and third positions under the conditions: pilot pressure of 20k and stroke of 10 mm or less, such that the ordinary excavating work permitting boom-up/-down operation is carried out. Only when the pilot pressure exceeds 20k, the first boom control valve 2 is adapted to be switched to the fourth position.
  • the first boom control valve 2 is switched within a range from the first position to the third position without being switched to the fourth position, and the second boom control valve 3 is not yet switched.
  • the boom 24 is lifted and lowered by the hydraulic operating fluid passing through the first boom control valve 2. Meanwhile, it is not until the operator pulls the boom-up joystick at a displacement of 10 mm or more and thus the pilot pressure exceeds 20k that the first boom control valve 2 is switched to the fourth position, the floating state, and thus the boom is lowered toward the ground by its self-weight.
  • the second directional control valve 10 When the operator switches the directional control switch 20 to the first position for the purpose of the excavating work, the second directional control valve 10 is switched to the first position. Thereby, the boom-up pilot lines Pi of the first and second boom control valves 2 and 3 communicate to allow the first and second boom control valves 2 and 3 to be switched in the direction where the boom is lifted. Simultaneously, the first directional control valve 8 is switched to the first position, so that the stopper 11 of the boom-down side port of the first boom control valve 2 communicates with the gear pump 9 through the pilot line Pi2. Thereby, the function of the stopper 11 is restored, so that the first boom control valve 2 is prevented from being switched to the fourth position.
  • the first and second boom control valves 2 and 3 are operated within a range from the first position and the third position for the purpose of the excavating work, that is, the boom-up, boom-down and boom stop, so that the ordinary excavating work is performed together with the other front attachments.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • General Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Paleontology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Operation Control Of Excavators (AREA)
  • Fluid-Pressure Circuits (AREA)
EP07851716.6A 2006-12-22 2007-12-21 Hydraulic system for improving flatting workability in an excavator Not-in-force EP2094915B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020060133167A KR101265342B1 (ko) 2006-12-22 2006-12-22 굴삭기의 수평 다림질 및 법면 작업성 개선장치
PCT/KR2007/006754 WO2008078930A1 (en) 2006-12-22 2007-12-21 Hydraulic system for improving flatting workability in an excavator

Publications (3)

Publication Number Publication Date
EP2094915A1 EP2094915A1 (en) 2009-09-02
EP2094915A4 EP2094915A4 (en) 2014-04-02
EP2094915B1 true EP2094915B1 (en) 2015-05-27

Family

ID=39562678

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07851716.6A Not-in-force EP2094915B1 (en) 2006-12-22 2007-12-21 Hydraulic system for improving flatting workability in an excavator

Country Status (4)

Country Link
EP (1) EP2094915B1 (ko)
KR (1) KR101265342B1 (ko)
CN (1) CN101573498B (ko)
WO (1) WO2008078930A1 (ko)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5079827B2 (ja) 2010-02-10 2012-11-21 日立建機株式会社 油圧ショベルの油圧駆動装置
CN101886405B (zh) * 2010-07-21 2012-01-11 山河智能装备股份有限公司 挖掘节能及平地高效的小型液压挖掘机主阀
KR102026348B1 (ko) * 2012-06-08 2019-11-04 스미도모쥬기가이고교 가부시키가이샤 쇼벨의 제어방법 및 제어장치
JP6435949B2 (ja) * 2015-03-25 2018-12-12 コベルコ建機株式会社 作業機械
JP6447294B2 (ja) * 2015-03-25 2019-01-09 コベルコ建機株式会社 作業機械
KR102620751B1 (ko) * 2019-07-17 2024-01-04 에이치디현대인프라코어 주식회사 건설 기계
JP7372726B2 (ja) * 2020-05-11 2023-11-01 キャタピラー エス エー アール エル 建設機械におけるブーム制御装置

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US3604313A (en) * 1970-05-14 1971-09-14 Gen Signal Corp Hydraulic power circuit with rapid lowering provisions
JPH0794737B2 (ja) 1989-08-02 1995-10-11 株式会社小松製作所 油圧掘削機における直線掘削制御装置
KR100335361B1 (ko) 1994-04-30 2002-08-28 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 굴삭기의평탄작업제어장치및방법
KR100226282B1 (ko) 1994-06-30 1999-10-15 토니헬샴 굴삭기의작업범위제한장치
JP3455369B2 (ja) * 1996-06-26 2003-10-14 日立建機株式会社 建設機械のフロント制御装置
KR100592545B1 (ko) * 1999-12-29 2006-06-23 두산인프라코어 주식회사 굴삭기의 붐하강 속도제어장치
KR100813779B1 (ko) * 2001-12-31 2008-03-13 두산인프라코어 주식회사 굴삭기의 붐제어장치
US6892535B2 (en) 2002-06-14 2005-05-17 Volvo Construction Equipment Holding Sweden Ab Hydraulic circuit for boom cylinder combination having float function
JP2004100154A (ja) * 2002-09-05 2004-04-02 Hitachi Constr Mach Co Ltd 建設機械の油圧駆動装置
KR101155718B1 (ko) * 2004-12-31 2012-06-12 두산인프라코어 주식회사 굴삭기의 주행제어장치

Also Published As

Publication number Publication date
KR101265342B1 (ko) 2013-05-20
WO2008078930A1 (en) 2008-07-03
CN101573498B (zh) 2011-06-15
KR20080058939A (ko) 2008-06-26
EP2094915A1 (en) 2009-09-02
CN101573498A (zh) 2009-11-04
EP2094915A4 (en) 2014-04-02

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