EP1211359A1 - Circuit de commande de verin de fleche de machine de chantier - Google Patents

Circuit de commande de verin de fleche de machine de chantier Download PDF

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Publication number
EP1211359A1
EP1211359A1 EP00956920A EP00956920A EP1211359A1 EP 1211359 A1 EP1211359 A1 EP 1211359A1 EP 00956920 A EP00956920 A EP 00956920A EP 00956920 A EP00956920 A EP 00956920A EP 1211359 A1 EP1211359 A1 EP 1211359A1
Authority
EP
European Patent Office
Prior art keywords
oil
boom
boom cylinder
lowering
discharging passage
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
EP00956920A
Other languages
German (de)
English (en)
Other versions
EP1211359B1 (fr
EP1211359A4 (fr
Inventor
Y. Shin Caterpillar Mitsubishi Ltd SHIMADA
Tetsuya Shin Caterpillar Mitsubishi Ltd YOSHINO
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.)
Caterpillar Japan Ltd
Original Assignee
Caterpillar Mitsubishi Ltd
Shin Caterpillar Mitsubishi Ltd
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Publication date
Application filed by Caterpillar Mitsubishi Ltd, Shin Caterpillar Mitsubishi Ltd filed Critical Caterpillar Mitsubishi Ltd
Publication of EP1211359A1 publication Critical patent/EP1211359A1/fr
Publication of EP1211359A4 publication Critical patent/EP1211359A4/fr
Application granted granted Critical
Publication of EP1211359B1 publication Critical patent/EP1211359B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • E02F9/2225—Control of flow rate; Load sensing arrangements using pressure-compensating valves
    • E02F9/2228—Control of flow rate; Load sensing arrangements using pressure-compensating valves including an electronic controller
    • 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
    • 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
    • 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
    • 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
    • F15B11/003—Systems with load-holding valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • 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
    • F15B11/024—Systems essentially incorporating special features for controlling the speed or actuating force of an output member by means of differential connection of the servomotor lines, e.g. regenerative circuits
    • 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"
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30505—Non-return valves, i.e. check valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30525—Directional control valves, e.g. 4/3-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
    • F15B2211/30—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
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3144—Directional control characterised by the positions of the valve element the positions being continuously variable, e.g. as realised by proportional valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
    • F15B2211/3157—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line
    • F15B2211/31588—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line having a single pressure source and 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
    • F15B2211/40—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
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40576—Assemblies of multiple valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/41—Flow control characterised by the positions of the valve element
    • F15B2211/413—Flow control characterised by the positions of the valve element the positions being continuously variable, e.g. as realised by proportional valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41581—Flow control characterised by the connections of the flow control means in the circuit being connected to an output member and a 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
    • F15B2211/40—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
    • F15B2211/6306—Electronic controllers using input signals representing a 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6346—Electronic controllers using input signals representing a state of input means, e.g. joystick position
    • 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 belongs to the technical field of a boom cylinder control circuit of an operation machine such as a hydraulic shovel.
  • a stick is supported so as to be swingable back and forth on the front end portion of a boom whose base end portion is supported so as to be swingable up and down on the machine main body and a tool such as a bucket, a breaker, a clamshell or the like is attached on the front end portion of the said stick.
  • a working machine for example as shown in Fig. 5, when removing operations of rocks lying on flat ground are performed by moving a bucket 7 back and forth along the ground, in addition to manipulations of the stick 6, manipulations of a boom 5 are performed simultaneously in order to move the boom up and down. Also, as shown in Fig.
  • the present invention has been created with the aim of solving these problems and provides a working machine comprising a boom cylinder for moving a boom up and down, wherein a control circuit of the boom cylinder is provided with: a control valve which performs pressure oil supplying and discharging control with respect to the boom cylinder based on manipulations of an operating member; a lowering side oil discharging passage which allows oil of a boom cylinder head side oil chamber to flow toward the oil reservoir side without passing through the control valve; and a control means which performs opening and closing control of the said lowering side oil discharging passage.
  • control circuit of the boom cylinder is further provided with: a rising side oil discharging passage which allows oil of a boom cylinder rod side oil chamber to flow toward the oil reservoir side without passing through the control valve and a control means for performing opening and closing control of the rising side oil discharging passage, whereby when the lowering and rising side oil discharging passages are opened, discharges of oil from the boom cylinder head side and rod side oil chambers are allowed and the boom moves down due to the empty weight and moves up due to an external force. For example, operations to move the bucket in the back and forth direction along the ground are performed, boom operations become easy and fuel consumption can be reduced.
  • the lowering side oil discharging passage is controlled so as to be opened based on a manipulation of the operating member toward the boom lowering side and on the other hand, when the said lowering side oil discharging passage is open, the lowering side oil discharging passage is controlled so that, even by operating the operating member toward the boom lowering side, the pressure oil is not supplied from the control valve to the boom cylinder, whereby it is avoidable that the boom unexpectedly moves down due to the empty weight without an operator's intentions.
  • control means which performs opening and closing control of the lowering side oil discharging passage and the rising side oil discharging passage can comprise solenoid valves which can be switched between the opening position to open the oil discharging passage and closing position to close the oil discharging passage.
  • valves for preventing empty weight-lowering which, when the operating member is not manipulated toward the boom lowering side, prevent oil from being discharged from the boom cylinder head side oil chamber, but, based on a manipulation toward the boom lowering side, allow oil to be discharged from the head side oil chamber.
  • the said hydraulic shovel 1 denotes a hydraulic shovel and the basic construction is the same as that of the prior art such that the said hydraulic shovel 1 comprises various portions such as a crawler-type lower structure 2, an upper structure 3 which is rotatably supported on the said lower structure 2, a front attachment 4 mounted on the said upper structure 3 and the like, and furthermore, the said front attachment 4 comprises various members such as a boom 5 which is supported so as to be swingable up and down on the upper structure 3, a stick 6 which is supported so as to be swingable back and forth on the front end portion of the boom 5, a bucket 7 which is attached so as to be swingable back and forth on the front end portion of the stick 6 and the like.
  • the said front attachment 4 comprises various members such as a boom 5 which is supported so as to be swingable up and down on the upper structure 3, a stick 6 which is supported so as to be swingable back and forth on the front end portion of the boom 5, a bucket 7 which is attached so as to be swingable back and forth on the front end portion of the stick 6
  • a variety of tools such as a breaker 8, a clamshell (not illustrated) and the like can be attached on the front end portion of the stick 6 depending on the operations performed by the hydraulic shovel 1.
  • Fig. 2 denotes a boom cylinder to swing the boom 5 up and down and a pressure oil charging and discharging circuit of the said boom cylinder 10 is shown in Fig. 2.
  • 11 denotes a hydraulic pump
  • 12 denotes an oil reservoir
  • 13 is a control valve for the boom
  • the control valve 13 comprises a 3-position selector valve provided with a first port 13a to be connected to the hydraulic pump 11, a second port 13b to be connected to the oil reservoir 12, a third port 13c to be connected to an oil chamber 10a on the rod side (cylinder contracting side) of the boom cylinder 10, a fourth port 13d to be connected to an oil chamber 10b on the head side (cylinder expanding side) of the boom cylinder 10 via a logic valve 14 (which will be described later), and pilot ports 13e and 13f on the expanding side and contracting side.
  • 11 denotes a hydraulic pump
  • 12 denotes an oil reservoir
  • 13 is a control valve for the boom
  • the control valve 13 comprises a 3-position selector valve
  • the control valve 13 is located at a neutral position N where the first through fourth ports 13a through 13d are closed, however, when a pilot pressure is supplied to the expanding side pilot port 13e, the control valve 13 is switched to an expanding side position X where the valve passage from the first port 13a to the fourth port 13d and the valve passage from the third port 13c to the second port 13b are opened and pressure oil from the hydraulic pump 11 is supplied to the head side oil chamber 10b of the boom cylinder 10 via the logic valve 14, while oil discharged from the rod side oil chamber 10a is flowed toward the oil reservoir 12.
  • the control valve 13 is switched to a contracting side position Y where the valve passage from the first port 13a to the third port 13c and the valve passage from the fourth port 13d to the second port 13b are opened and pressure oil from the hydraulic pump 11 is supplied to the rod side oil chamber 10a of the boom cylinder 10, while oil discharged from the head side oil chamber 10b is flowed toward the oil reservoir 12 via the logic valve 14.
  • 15A and 15B denote pilot valves on the expanding side and contracting side, and by manipulating a boom operating lever 16 toward the boom rising side (cylinder expanding side) or the boom lowering side (cylinder contracting side), a pilot pressure is output from the pilot valve 15A or 15B on the side thus operated.
  • the pilot pressure output from the expanding side pilot valve 15A is supplied to the expanding side pilot port 13e of the control valve 13.
  • the pilot pressure output from the contracting side pilot valve 15B is supplied to the contracting side pilot port 13f of the control valve 13 via a first solenoid valve 17 (which will be described later) and also supplied to a pilot port 18a of a control valve 18 (which will be described later).
  • the pilot pressure is outputted from the contracting side pilot valve 15B, the said pressure is detected by a pressure sensor 19.
  • the first solenoid valve 17 is a 2-position selector valve and this is, in a condition where a solenoid 17a is not excited, located at the first position X where the pilot pressure output from the contracting side pilot valve 15B is supplied to the control valve contracting side pilot port 13f, however, when the solenoid 17a is excited based on a command from a control portion 20 (which will be described later), the first solenoid valve 17 is switched to the second position Y where the pilot pressure is not supplied to the control valve contracting side pilot port 13f.
  • the control valve 18 is a 2-position selector valve provided with the pilot port 18a and the first through third ports 18b through 18d.
  • the pilot port 18a is connected to the contracting side pilot valve 15B
  • the first port 18b is connected to a first pilot port 14e of the logic valve 14 (which will be described later)
  • the second port 18c is connected to a second pilot port 14h of the logic valve 14
  • the third port 18d is connected to the oil reservoir 12.
  • control valve 18 is located at a first position X where the valve passage which communicates the first port 18b to the second port 18c is opened and the third port 18d is closed when a pilot pressure is not supplied to the pilot port 18a, however, when a pilot pressure is supplied to the pilot port 18a, the control valve 18 is switched to a second position Y where the first port 18b is closed and the valve passage from the second port 18c to the third port 18d is opened.
  • the logic valve 14 is constructed using a poppet 14a and provided with a first oil chamber 14c where a first port 14b is formed, a second oil chamber 14f where a second port 14d and the first pilot port 14e are formed, and a spring storage chamber 14i where a spring 14g is stored and the second pilot port 14h is formed.
  • the first port 14b of the logic valve 14 is connected to the fourth port 13d of the control valve 13, the second port 14d is connected to the head side oil chamber 10b of the boom cylinder 10, the first pilot port 14e is, as mentioned before, connected to the first port 18b of the control valve 18, and the second pilot port 14h is connected to the second port 18c of the control valve 18. Also, the spring 14g is set so as to press the poppet 14a toward the closing position side (which will be described later).
  • the logic valve 14 is structured so that, in a condition where the control valve 18 is located at the first position X, the pressure of the head side oil chamber 10b of the boom cylinder 10 is introduced in the spring storage chamber 14i via the second port 14d, the second oil chamber 14f, the first pilot port 14e, the control valve 18 at the first position X, and the second pilot port 14h, and the pressure introduced in the said spring storage chamber 14i acts as a force to press the poppet 14a toward the closing position side.
  • the poppet 14a is structured so as to be movable to the closing position (the position of the poppet 14a of Fig. 2) where the valve passage 14k which communicates the first oil chamber 14c to the second oil chamber 14f is closed to prevent oil from entering or exiting from the boom cylinder head side oil chamber 10b and the opening position (the position of the poppet 14a of Figs. 3 and 4.) where the valve passage 14k is opened and allows oil to enter or exit from the boom cylinder head side oil chamber 10b.
  • the pressure introduced in the spring storage chamber 14i and a pressing force of the spring 14g are set so as to act as a force to press the poppet 14a toward the closing position side and the pressure inputted in the first oil chamber 14c and the second oil chamber 14f is set so as to act as a force to press the poppet 14a toward the opening position side.
  • the poppet 14a is pressed by the total pressure (A + B) of the pressure A introduced in the spring storage chamber 14i and the pressing force B of the spring 14g toward the closing position side.
  • the above-described total pressure (A + B) is set so as to be greater than the pressure C which is inputted from the boom cylinder head side oil chamber 10b into the second oil chamber 14f and presses the poppet 14a toward the opening position side (A + B > C) but smaller than the total pressure (C + D) of the said pressure C and the pressure D which is inputted from the hydraulic pump 11 via the control valve 13 at the expanding side position X into the first oil chamber 14c and presses the poppet 14a toward the opening position side (A + B ⁇ C + D).
  • the poppet 14a is held at the closing position and prevents oil from being discharged from the boom cylinder head side oil chamber 10b as long as the pressure oil from the hydraulic pump 11 is not inputted into the first oil chamber 14c.
  • the poppet 14a is located at the opening position.
  • the poppet 14a is pressed toward the closing position side only by the pressing force B of the spring 14g, while the said pressing force B of the spring 14g is set so as to be smaller than the pressure C which is inputted from the boom cylinder head side oil chamber 10b into the second oil chamber 14f and presses the poppet 14a toward the opening position side (B ⁇ C).
  • the poppet 14a is located at the opening position by the pressure of the boom cylinder head side oil chamber 10b.
  • the logic valve 14 when the boom operating lever 16 is manipulated toward the lowering side or the rising side, the logic valve 14 is located at the opening side and allows oil to enter and exit from the boom cylinder head side oil chamber 10b, whereas when the boom operating lever 16 is not manipulated toward either the lowering side or the rising side, the logic valve 14 is held at the closing side and prevents oil from being discharged from the boom cylinder head side oil chamber 10b.
  • the logic valve 14 and the control valve 18 are directly mounted on the boom cylinder 10 as one valve unit for preventing empty weight-lowering.
  • a lowering side oil discharging passage E leading to the oil reservoir 12 is formed by branching off from the oil passage which couples the control valve fourth port 13d with the logic valve first port 14b.
  • a second solenoid valve 21 (which will be described later) is disposed on the said lowering side oil passage E.
  • a rising side oil discharging passage F leading to the oil reservoir 12 is formed by branching off from the oil passage which couples the control valve third port 13c with the boom cylinder rod side oil chamber 10a.
  • a third solenoid valve 22 (which will be described later) is disposed on the said rising side discharging oil passage F.
  • the second solenoid valve 21 and the third solenoid valve 22 are 2-position selector valves and these are, in a condition where solenoids 21a and 22a are not excited, located at the closing position X where the lowering side discharging oil passage E and the rising side discharging oil passage F are respectively closed, however, when the solenoids 21a and 22a are excited based on commands from a control unit 20, the second solenoid valve 21 and the third solenoid valve 22 are switched to the opening position Y where the lowering side discharging oil passage E and the rising side discharging oil passage F are respectively opened.
  • the oil discharged from the boom cylinder head side oil chamber 10b via the logic valve 14 at the opening side can be flowed to the oil reservoir 12 via the lowering side oil discharging passage E
  • the oil discharged from the boom cylinder rod side oil chamber 10a can be flowed to the oil reservoir 12 via the rising side oil discharging passage F.
  • control unit 20 is constructed using a microcomputer and the like, wherein signals from the pressure sensor 19 and a mode selector switch 23 (which will be described later) are inputted and based on the said input signal, solenoid exciting control signals are outputted to the first through third solenoid valves 17, 21, and 22.
  • the mode selector switch 23 is provided on the operator's seat portion of the hydraulic shovel 1 and can select and set from three modes of "normal mode” for performing normal operations such as excavation and loading and the like, "lowering hold releasing mode” for performing operations to crush stones and the like by means of the breaker 8, and "lowering and rising hold releasing mode” for performing operations to move the bucket 7 back and forth along the ground and the like.
  • the control unit 20 When the mode selector switch 23 is set to the "normal mode", the control unit 20 does not output the solenoid exiting signals to the first, second, and third solenoid valves 17, 21, and 22. Accordingly, the first solenoid valve 17 is located at the first position X where the pilot pressure output from the contracting side pilot port 15B is supplied to the control valve contracting side pilot port 13f. Also, the second solenoid valve 21 and the third solenoid valve 22 are located at the closing position X where the lowering side oil discharging passage E and the rising side oil discharging passage F are respectively closed.
  • a pilot pressure is output from the contracting side pilot valve 15B.
  • the said pilot pressure is supplied via the first solenoid valve 17 at the first position X to the control valve contracting side pilot port 13f and switches the control valve 13 to the contracting side position Y, while the said pilot pressure is supplied to the pilot port 18a of the control valve 18 and switches the control valve 18 to the second position Y.
  • the pressure oil output from the hydraulic pump 11 is supplied via the control valve 13 at the contracting side position Y to the boom cylinder rod side oil chamber 10a.
  • the oil of the boom cylinder head side oil chamber 10b is discharged via the logic valve 14 at the opening position and the control valve 13 at the contracting side position Y to the oil reservoir 12, thus the boom cylinder 10 contracts and the boom 5 moves down.
  • the control unit 20 outputs the solenoid exciting signal to the first solenoid valve 17. Accordingly, the first solenoid valve 17 is switched to the second position Y where the pilot pressure output from the contracting side pilot valve 15B is not supplied to the control valve contracting side pilot port 13f.
  • the control unit 20 further outputs a solenoid exciting signal to the second solenoid valve 21, whereby the second solenoid valve 21 is switched to the opening side Y where the lowering side oil discharging passage E is opened.
  • a solenoid exciting signal is not outputted to the third solenoid valve 22, the said third solenoid valve 22 is held at the closing position X where the rising side oil discharging passage F is closed.
  • a pilot pressure output from the contracting side pilot valve 15B is supplied to the pilot port 18a of the control valve 18 and switches the control valve 18 to the second position Y, and based on the detection of the output of the said pilot pressure by the pressure sensor 19, a solenoid exciting signal is output to the second solenoid valve 21 from the control portion 20, whereby the second solenoid valve 21 is switched to the opening position Y where the lowering side oil discharging passage E is opened.
  • the control unit 20 outputs the solenoid exciting signals to the first solenoid valve 17 and the third solenoid valve 22. Accordingly, the first solenoid valve 17 is switched to the second position Y where the pilot pressure output from the contracting side pilot valve 15B is not supplied to the control valve contracting side pilot port 13f.
  • the third solenoid valve 22 is switched to the opening position Y where the rising side oil discharging passage F is opened.
  • control unit 20 When the output of the pilot pressure from the contracting side pilot valve 15B is detected by the pressure sensor 19, the control unit 20 further outputs the solenoid exciting signal to the second solenoid valve 21, whereby the second solenoid valve 21 is switched to the opening position Y where the lowering side oil discharging passage E is opened.
  • the oil of the boom cylinder rod side oil chamber 10a is discharged to the oil reservoir 12 via the control valve 13 at the expanding side position X or the third solenoid valve 22 at the opening position Y, thus the boom cylinder 10 expands and the boom 5 moves up.
  • the mode selector switch 23 when normal operations such as excavation and loading and the like are performed, the mode selector switch 23 is set to the "normal mode". Accordingly, as mentioned before, a pressure oil is supplied to the boom cylinder 10 based on manipulations of the boom operating lever 16. On the other hand, since both rising side oil discharging passage E and lowering side oil discharge passage F are closed, the boom 5 does not move up and down due to the external force, thus normal up and down movements of the boom 5 can be performed based on the manipulations of the boom operation lever 16.
  • the mode selector switch 23 When operations to crush stones and the like are performed by means of the breaker 8, the mode selector switch 23 is set to the "lowering hold releasing mode". In this condition, when the boom operating lever 16 is manipulated toward the lowering side, the control valve 13 is held at the neutral position N, while the lowering side oil discharging passage F is opened. The boom 5 moves down due to the empty weight of the front attachment 4. Thus, the breaker 8 is pressed downward by the empty weight of the front attachment 4 and can obtain a thrust that is required in the stone crushing operations. Moreover, at this time, the rising side oil discharging passage E is closed and upward movement is restricted, the reaction force is not lost and effective breaker operations can be performed.
  • the mode selector switch 23 is set to the "lowering and rising hold releasing mode".
  • the control valve 13 is held at the neutral position N, while the rising side oil discharging passage E and the lowering side oil discharging passage F are opened.
  • the boom 5 moves up due to the external force and moves down due to the empty weight of the front attachment 4.
  • the boom 5 automatically moves up due to the reaction force that the bucket 7 receives from the ground and also automatically moves down due to the empty weight of the front attachment 4.
  • the bucket 7 can be moved in the back and forth direction along the ground without performing operations to move the boom 5 up and down.
  • the boom operating lever 16 is manipulated toward the lowering side.
  • the boom 5 moves down until the front end portion of the clamshell is brought into contact with the objects due to the empty weight of the front attachment 4 and when the front end portion of the clamshell is brought into contact with the objects, the boom 5 automatically stops moving down.
  • the boom 5 can be easily operated and operability is improved.
  • a pressure oil is not supplied from the hydraulic pump 11 to the boom cylinder 10, thus contributing to a reduction in fuel consumption.
  • the downward movement due to the empty weight of the boom 5 is allowed only when the mode selector switch 23 is set to the "lowering hold releasing mode” or “lowering and rising hold releasing mode” and the boom operating lever 16 is manipulated toward the lowering side, therefore there is an advantage in that an inconvenience such that the boom 5 unexpectedly moves down due to the empty weight against the operator's intentions is avoidable.
  • the present invention by constructing as such, when the lower side oil discharging passage of a working machine such as a hydraulic shovel is opened, an oil discharge from the head side oil chamber of the boom cylinder is allowed and the boom moves down due to the empty weight.
  • a working machine such as a hydraulic shovel
  • an oil discharge from the head side oil chamber of the boom cylinder is allowed and the boom moves down due to the empty weight.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Operation Control Of Excavators (AREA)
  • Fluid-Pressure Circuits (AREA)
EP00956920A 2000-03-17 2000-09-04 Circuit de commande d'un vérin de flèche d'une machine de chantier Expired - Lifetime EP1211359B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2000076002A JP3627972B2 (ja) 2000-03-17 2000-03-17 作業機械におけるブームシリンダ制御回路
JP2000076002 2000-03-17
PCT/JP2000/006005 WO2001071110A1 (fr) 2000-03-17 2000-09-04 Circuit de commande de verin de fleche de machine de chantier

Publications (3)

Publication Number Publication Date
EP1211359A1 true EP1211359A1 (fr) 2002-06-05
EP1211359A4 EP1211359A4 (fr) 2006-12-13
EP1211359B1 EP1211359B1 (fr) 2008-11-05

Family

ID=18593808

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00956920A Expired - Lifetime EP1211359B1 (fr) 2000-03-17 2000-09-04 Circuit de commande d'un vérin de flèche d'une machine de chantier

Country Status (4)

Country Link
EP (1) EP1211359B1 (fr)
JP (1) JP3627972B2 (fr)
DE (1) DE60040746D1 (fr)
WO (1) WO2001071110A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2402174A (en) * 2003-05-28 2004-12-01 Volvo Constr Equip Holding Se Load holding valve control
EP3305995A4 (fr) * 2015-06-02 2019-01-23 Doosan Infracore Co., Ltd. Système hydraulique de machine de construction
KR20200131243A (ko) * 2018-03-22 2020-11-23 스미도모쥬기가이고교 가부시키가이샤 쇼벨

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100631072B1 (ko) * 2005-06-27 2006-10-02 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 중장비 옵션장치용 유압회로
JP5975073B2 (ja) * 2014-07-30 2016-08-23 コベルコ建機株式会社 建設機械
JP6752686B2 (ja) * 2016-10-28 2020-09-09 住友建機株式会社 ショベル
JP6580618B2 (ja) * 2017-03-21 2019-09-25 日立建機株式会社 建設機械
CN114174594B (zh) * 2019-07-17 2023-11-21 现代斗山英维高株式会社 工程机械及其控制方法
DE102022131859A1 (de) * 2022-12-01 2024-06-06 Zöller-Kipper Gesellschaft mit beschränkter Haftung Hydraulikanordnung

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FR2537184A1 (fr) * 1982-12-03 1984-06-08 Orenstein & Koppel Ag Procede et circuit hydraulique pour economiser de l'energie lors de l'actionnement d'un cylindre de manoeuvre sur un excavateur hydraulique
EP0436740A1 (fr) * 1989-08-02 1991-07-17 Kabushiki Kaisha Komatsu Seisakusho Appareil de commande d'excavation lineaire dans une excavatrice hydraulique
DE19932948A1 (de) * 1998-07-23 2000-02-10 Caterpillar Inc Gesteuerte Schwebeschaltung für eine Betätigungsvorrichtung

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JPH09132927A (ja) * 1995-11-08 1997-05-20 Komatsu Ltd 油圧ショベルの油圧回路
JP3182081B2 (ja) * 1996-07-01 2001-07-03 新キャタピラー三菱株式会社 作業用機械における油圧シリンダの油圧回路
JPH11158859A (ja) * 1997-11-27 1999-06-15 Kobelco Constr Mach Eng Co Ltd 作業機械の制御回路

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Publication number Priority date Publication date Assignee Title
FR2537184A1 (fr) * 1982-12-03 1984-06-08 Orenstein & Koppel Ag Procede et circuit hydraulique pour economiser de l'energie lors de l'actionnement d'un cylindre de manoeuvre sur un excavateur hydraulique
EP0436740A1 (fr) * 1989-08-02 1991-07-17 Kabushiki Kaisha Komatsu Seisakusho Appareil de commande d'excavation lineaire dans une excavatrice hydraulique
DE19932948A1 (de) * 1998-07-23 2000-02-10 Caterpillar Inc Gesteuerte Schwebeschaltung für eine Betätigungsvorrichtung

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See also references of WO0171110A1 *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2402174A (en) * 2003-05-28 2004-12-01 Volvo Constr Equip Holding Se Load holding valve control
US6907815B2 (en) 2003-05-28 2005-06-21 Volvo Construction Equipment Holding Sweden Ab Control apparatus of hydraulic valve for holding load
GB2402174B (en) * 2003-05-28 2007-01-03 Volvo Constr Equip Holding Se Load holding actuator control apparatus
EP3305995A4 (fr) * 2015-06-02 2019-01-23 Doosan Infracore Co., Ltd. Système hydraulique de machine de construction
US10407876B2 (en) 2015-06-02 2019-09-10 Doosan Infracore Co., Ltd. Hydraulic system of construction machinery
KR20200131243A (ko) * 2018-03-22 2020-11-23 스미도모쥬기가이고교 가부시키가이샤 쇼벨
US11454001B2 (en) 2018-03-22 2022-09-27 Sumitomo Heavy Industries, Ltd. Excavator
KR102638727B1 (ko) 2018-03-22 2024-02-19 스미도모쥬기가이고교 가부시키가이샤 쇼벨

Also Published As

Publication number Publication date
DE60040746D1 (de) 2008-12-18
JP2001262629A (ja) 2001-09-26
WO2001071110A1 (fr) 2001-09-27
JP3627972B2 (ja) 2005-03-09
EP1211359B1 (fr) 2008-11-05
EP1211359A4 (fr) 2006-12-13

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