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WO2002055793A1 - Circuit de controle hydraulique de cylindre de bome de machine - Google Patents

Circuit de controle hydraulique de cylindre de bome de machine Download PDF

Info

Publication number
WO2002055793A1
WO2002055793A1 PCT/JP2001/011004 JP0111004W WO02055793A1 WO 2002055793 A1 WO2002055793 A1 WO 2002055793A1 JP 0111004 W JP0111004 W JP 0111004W WO 02055793 A1 WO02055793 A1 WO 02055793A1
Authority
WO
WIPO (PCT)
Prior art keywords
oil
boom
hydraulic
oil chamber
valve
Prior art date
Application number
PCT/JP2001/011004
Other languages
English (en)
Japanese (ja)
Inventor
Tetsuya Yoshino
Yoshiyuki Shimada
Original Assignee
Shin Caterpillar Mitsubishi 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 Shin Caterpillar Mitsubishi Ltd. filed Critical Shin Caterpillar Mitsubishi Ltd.
Publication of WO2002055793A1 publication Critical patent/WO2002055793A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/024—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
    • 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
    • E02F9/2278—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
    • 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
    • F15B2011/0246—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 with variable regeneration flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20576—Systems with pumps with multiple pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30525—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
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/3056—Assemblies of multiple valves
    • F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve
    • F15B2211/3058—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve having additional valves for interconnecting the fluid chambers of a double-acting actuator, e.g. for regeneration mode or for floating mode
    • 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
    • F15B2211/31576—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 a single output member
    • 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • 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
    • F15B2211/67—Methods for controlling pilot pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—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
    • F15B2211/7128—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators the chambers being connected in parallel
    • 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
    • F15B2211/75—Control of speed of the output member

Definitions

  • the present invention belongs to the technical field of a hydraulic control circuit for a boom cylinder in a working machine such as a hydraulic shovel used for various types of construction work and civil engineering work. Background art
  • A is a head line connecting the first boom control valve 14 and the second boom control valve 15 with the head oil chamber 8a of the boom cylinder 8, and B is a first boom.
  • a rod-side line connecting the control valve 14 to the head-side oil chamber 8b of the cylinder cylinder 8, and D is a regeneration line that connects the head-side line A and the rod-side line B.
  • Ah, the reproduction line! Is provided with a regeneration valve 19 and a check valve 21.
  • the pressure oil from the first hydraulic pump 11 is supplied to the boom cylinder 8 via the first boom control valve 14 to the mouth-side oil chamber 8 b of the boom cylinder 8.
  • the oil discharged from the oil chamber 8a is discharged to the oil tank 13 via the first boom control valve 14 and the load side oil chamber 8b via the regeneration valve 19 and the check valve 21. It is being supplied to In other words, when the pressure in the head-side oil chamber 8a is higher than the pressure in the rod-side oil chamber 8b when the boom is lowered, the oil discharged from the head-side oil chamber 8a is used as reclaimed oil.
  • the rod-side oil chamber 8b can be supplied to the rod-side oil chamber 8b in addition to the pressure oil of the first hydraulic pump 11 supplied from the first boom control valve 14.
  • the operation speed of the boom cylinder 8 can be increased without the pressure side oil chamber 8b being in a reduced pressure state.
  • another hydraulic actuator eg, a bucket cylinder
  • the excess pump flow obtained by the regenerated oil is used for another hydraulic pump. Since the supply can be performed overnight, it is possible to suppress a decrease in the operating speed of the other hydraulic actuators during the combined operation, thereby contributing to the improvement of the working efficiency.
  • the amount of the regenerated oil from the cylinder side oil chamber to the cylinder side oil chamber is increased so that the cylinder speed is increased.
  • the hydraulic control circuit includes: Neutral holding means capable of holding the control valve in the neutral position regardless of the position of the control valve; a discharge oil passage for flowing the discharged oil from the oil chamber on the weight holding side to the oil tank without passing through the control valve; It is provided with a and valve means for opening and closing control of the road.
  • a hydraulic control circuit of a boom cylinder having a regeneration circuit for supplying the oil to the oil chamber, the hydraulic control circuit being capable of holding the first control valve in a neutral position regardless of operation of the operating tool.
  • Means is provided, and the second control valve is further provided with discharge control means for flowing the discharged oil from the oil chamber on the weight holding side to the oil tank.
  • the second control valve can be used to lower the boom's own weight or change the boom's descent speed in accordance with the work content and the skill of the work overnight.
  • workability and operability are improved, and parts can be shared.
  • FIG. 1 is a perspective view of a hydraulic excavator.
  • FIG. 3 is a hydraulic control circuit diagram showing a conventional example. BEST MODE FOR CARRYING OUT THE INVENTION
  • reference numeral 1 denotes a hydraulic excavator.
  • the hydraulic excavator 1 includes a crawler-type lower traveling body 2, an upper revolving body 3 rotatably supported by the lower traveling body 2, and a front of the upper revolving body 3.
  • the front attachment 4 includes a boom 5 that is supported by the upper revolving unit 3 so as to be able to swing up and down, and a front and rear end of the boom 5.
  • a stick 6 swingably supported, a bucket 7 swingably supported at the front end of the stick 6, a boom cylinder 8 for swinging the boom 5, the stick 6, and the bucket 7.
  • the basic configuration such as the configuration of the member devices such as the stick cylinder 9 and the bucket cylinder 10 is the same as the conventional one.
  • tip of the stick 6 is Instead of the packet 7, various work equipment such as a breaker and a clamshell (both not shown) are attached.
  • A is a head side line connecting the first boom control valve 14 and the second boom control valve 15 to the head side oil chamber 8 a of the boom cylinder 8
  • B is a port side line connecting the first boom control valve 14 and the load side oil chamber 8b of the boom cylinder 8
  • D is a regeneration line connecting the head side line A and the rod side line B.
  • the boom cylinder 8 is extended by the supply of pressurized oil to the head-side oil chamber 8a and the oil discharge from the head-side oil chamber 8b to raise the boom 5;
  • the boom 5 is lowered by supplying compressed oil to the side and discharging oil from the head-side oil chamber 8a.
  • the head-side oil chamber 8a is Holding the weight of the cement 4 corresponds to the weight holding side oil chamber of the present invention.
  • the first boom control valve 14 includes ascending and descending pilot ports 14a and 14b, and a pilot port input to these pilot ports 14a and 14b. It is composed of a spool valve whose opening degree of the supply and discharge valve paths 14 c to 14 f described later is adjusted by pressure.
  • control valve 14 for the first boom is displaced to the lower position Y by the input of the pie port pressure to the lower pilot port 14 b, and the pressure from the first hydraulic pump 11 is changed.
  • the oil from the head side oil chamber 8a of the first boom control valve 14 at the descending side position Y to the oil tank 13 is discharged from the throttle provided in the discharge valve path 14f. This is performed in a state where the flow rate is adjusted by 14 g, but the oil discharge flow rate of the discharge valve path 14 f is set to a flow rate necessary to obtain a slow boom lowering speed suitable for performing a fine operation. ing.
  • the second boom control valve 15 has ascending and descending pilot ports 15a and 15b, and a pilot port input to these pilot ports 15a and 15b. It is composed of a spool valve whose opening degree of supply and discharge valve paths 15c and 15d described later is adjusted by pressure.
  • the control valve 15 for the second boom is located at the neutral position N when the pilot pressure is not input to both the pilot ports 15a and 15b, and the hydraulic oil for the boom cylinder 8 is No supply / discharge is performed, but when the pilot pressure is input to the rising pilot port 15a, it is displaced to the rising position X to open the supply valve passage 15c.
  • the hydraulic oil from the second hydraulic pump 12 is supplied to the head side oil chamber 8a of the boom cylinder 8 via the head side line A. Further, the control pulp 15 for the second boom is displaced to the descending position Y by opening the pilot port 15b when the pilot pressure is input to the descending ⁇ ! Pilot port 15b, so that the discharge valve path 15d is opened. As a result, the oil discharged from the head-side oil chamber 8a passes through the head-side line A to the oil tank 13 through the throttle 15e provided in the discharge valve path 15d. It is configured to flow. Further, in FIG. 3 shown in FIG. 3, reference numeral 17 denotes a boom pilot valve, which is composed of an ascending-side pilot port valve 17 A and a descending-side pilot port valve 17 B.
  • these ascending and descending pilot valves 17 A and 17 B are operated by operating the boom operation lever 18 to the boom ascending and descending sides.
  • the pilot pressure corresponding to the manipulated variable is output.
  • the pilot pressure output from the ascending pilot valve 17 A passes through the ascending pilot line E, and the ascending pilot port 14 a of the first and second boom control pulp 14, 15, Entered in 15 a.
  • the pilot pressure output from the descending pilot valve 17B is input to a pilot port 19a of a regeneration valve 19 to be described later via a descending pilot line F, and a mode switching valve is provided. Supplied to 20.
  • the mode selection switch 22 is a mode selection switch provided on the driver's seat, and the mode selection switch 22 is a first and second solenoids 20a, 20b of the mode switching valve 20. Is electrically connected to the The mode selection switch 22 can be arbitrarily selected from “boom lowering speed L 0W”, “boom lowering speed HIGH”, and “boom own weight lowering”.
  • the boom lowering speed L OW is set, both solenoids 20a and 2Ob of the mode switching valve 20 are not energized, and the boom lowering speed HIGH is set.
  • the first solenoid 20a is energized, and when "boom self-weight descent" is set, the second solenoid 2Ob is energized.
  • reference numeral 23 denotes a line relief valve provided in a relief oil passage extending from the rod side line B to the oil tank 13.
  • the pressure oil from the first hydraulic pump 11 is supplied to the load side oil chamber 8 b of the boom cylinder 8 via the first boom control valve 14, and the head side line A
  • the pressure of the oil is higher than that of the inlet side line B
  • part of the oil discharged from the head side oil chamber 8a is transferred to the load side oil via the regeneration valve 19 and the check valve 21.
  • Room 8b is supplied as reclaimed oil.
  • the remaining oil discharged from the head side oil chamber 8a is discharged to the oil tank 13 via the first boom control valve 14.
  • the oil discharge from the head side oil chamber 8 a of the boom cylinder 8 to the oil tank 13 is performed by the first boom control valve 1. 4 is performed only via the discharge valve path 14f, but the oil discharge flow rate of the discharge valve path 14f is set to a flow rate at which a slow boom lowering speed is obtained. As a result, the boom 5 descends slowly, improving operability when performing a fine operation or when the operator is a beginner.
  • the oil discharge from the head side oil chamber 8a of the boom cylinder 8 to the oil tank 13 is controlled by both the first and second booms. This is done via the exhaust valve passages 14f, 15d of the valves 14 and 15, so that the second boom can be used as compared with the case where only the first boom control valve 14 described above is used.
  • the amount of oil discharge increases by the amount of the control valve 15 and the oil is quickly discharged from the head-side oil chamber 8a, so that the boom 5 is lowered at a high speed. be able to.
  • the mode select switch 2 2 when the bucket 7 is moved back and forth along the ground to remove rocks that fall on flat ground, when performing crushing work with a breaker, or when scooping up objects with a clamshell Set the mode select switch 2 2 to “Boom self-weight descent”.
  • the second solenoid 2 Ob of the mode switching valve 20 is energized, and the mode switching valve 20 changes the pressure of the descending pilot line F to the descending pilot port of the second boom control valve 15. Input to 15b, and switch to the second position Y that connects the lower pilot port 14b of the first boom control valve 14 to the oil tank 13.
  • the bucket 5 when the bucket 7 is moved back and forth along the ground to remove rocks that fall on a flat ground, the bucket 5 can drop by its own weight without paying careful attention to the boom operation. 7 can be kept grounded. Further, when performing the breaker work, the breaker is pressed down by the weight of the front attachment 4 so that thrust necessary for the crushing work can be obtained. Further, when performing the work of picking up an object with the clamshell, the boom 5 will descend by its own weight until the clamshell comes into contact with the object, and will automatically stop when it comes into contact. As described above, in the present embodiment, when lowering the boom 5, if the mode selection switch 22 is set to the “boom lowering speed HIGH”, the head-side oil chamber 8 a of the pump cylinder 8 is set.
  • the mode selection switch 22 is set to the “boom descent speed L OW”, the oil chamber on the head side The oil discharge flow from 8a to the oil tank 13 decreases, and the lowering speed of the boom 5 decreases. Further, if the mode selection switch 22 is set to “boom self-weight lowering” and operated to the boom lowering side, the boom 5 will lower its own weight due to the weight of the front unit 4.
  • the oil discharge flow from the head J oil chamber 8a to the oil tank 13 increases, and the oil flows from the head side oil chamber 8a to the oil tank 13 when the boom own weight falls.
  • the discharge is performed by using the second boom control valve 15.
  • the second boom control valve 15 discharges the hydraulic oil of the second hydraulic pump 12 when the boom 5 is raised. Since the valve operates to supply the oil to the head-side oil chamber 8a, a single valve has a plurality of functions, so that the members can be shared and contribute to cost reduction. Further, since the control pulp 15 for the second boom is a spool valve whose opening is adjusted by the input pilot pressure, good operability corresponding to the operation amount of the operation lever 18 for the boom is obtained. be able to. Industrial applicability
  • the hydraulic control circuit for a boom cylinder includes: an operating position for controlling a hydraulic oil supply and discharge to the boom cylinder based on an operation of an operating tool by using a first hydraulic pump as a hydraulic oil supply source; A first control valve that can be switched to a neutral position that does not perform discharge, and a second hydraulic pump that uses a hydraulic oil supply as a source for the boom cylinder weight holding oil chamber.

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

Abstract

L'invention concerne un circuit de contrôle hydraulique comportant un cylindre de bôme pour déplacer verticalement une bôme, une soupape de contrôle de régulation de l'approvisionnement et de la décharge d'huile comprimée vers et depuis le cylindre de bôme et un circuit de régénération pour amener une partie de l'huile déchargée de la chambre à huile latérale principale du cylindre de bôme vers la chambre à huile latérale de piston, basée sur la sélection d'un commutateur de sélecteur de mode (22). Une première soupape de contrôle de section de bôme (14) est maintenue en position neutre (N) alors que la bôme est abaissée et l'huile déchargée dans la chambre à huile latérale principale (8a) du cylindre de bôme (8) est approvisionnée dans un réservoir d'huile (13) par une seconde soupape de contrôle de section de bôme (15), ainsi la bôme peut être abaissée par son propre poids et on peut faire varier la vitesse d'abaissement de la bôme en fonction du type de travail et de qualification d'un opérateur.
PCT/JP2001/011004 2001-01-15 2001-12-14 Circuit de controle hydraulique de cylindre de bome de machine WO2002055793A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001-006230 2001-01-15
JP2001006230A JP3849970B2 (ja) 2001-01-15 2001-01-15 作業機械におけるブームシリンダの油圧制御回路

Publications (1)

Publication Number Publication Date
WO2002055793A1 true WO2002055793A1 (fr) 2002-07-18

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2001/011004 WO2002055793A1 (fr) 2001-01-15 2001-12-14 Circuit de controle hydraulique de cylindre de bome de machine

Country Status (2)

Country Link
JP (1) JP3849970B2 (fr)
WO (1) WO2002055793A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3305995A4 (fr) * 2015-06-02 2019-01-23 Doosan Infracore Co., Ltd. Système hydraulique de machine de construction
US11231053B2 (en) 2018-06-13 2022-01-25 Parker Hannifin Emea S.À.R.L. Hydraulic valve arrangement
EP3910115A3 (fr) * 2020-03-24 2022-03-09 J.C. Bamford Excavators Limited Système hydraulique pour machine de travail, machine de travail avec un tel système hydraulique, et procédé d'operation d'un tel système hydraulique
GB2627377A (en) * 2020-03-24 2024-08-21 Bamford Excavators Ltd Hydraulic system

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006257724A (ja) * 2005-03-16 2006-09-28 Hitachi Constr Mach Co Ltd 作業機械の安全装置
JP5419835B2 (ja) * 2010-09-10 2014-02-19 日立建機株式会社 作業機械
WO2015068869A1 (fr) * 2013-11-07 2015-05-14 볼보 컨스트럭션 이큅먼트 에이비 Dispositif hydraulique pour engin de chantier
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GB2627377A (en) * 2020-03-24 2024-08-21 Bamford Excavators Ltd Hydraulic system

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