WO2003069164A1 - Circuit hydraulique - Google Patents

Circuit hydraulique Download PDF

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Publication number
WO2003069164A1
WO2003069164A1 PCT/JP2003/000037 JP0300037W WO03069164A1 WO 2003069164 A1 WO2003069164 A1 WO 2003069164A1 JP 0300037 W JP0300037 W JP 0300037W WO 03069164 A1 WO03069164 A1 WO 03069164A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
boom
pilot
reducing valve
fluid
Prior art date
Application number
PCT/JP2003/000037
Other languages
English (en)
Japanese (ja)
Inventor
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 WO2003069164A1 publication Critical patent/WO2003069164A1/fr

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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
    • 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
    • E02F9/2203—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
    • E02F9/2225—Control of flow rate; Load sensing arrangements using pressure-compensating valves
    • 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
    • E02F9/2278—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
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
    • F15B11/162—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load for giving priority to particular servomotors or users
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
    • F15B11/167—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load using pilot pressure to sense the demand
    • 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
    • F15B2211/3056—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
    • F15B2211/3057—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 two valves, one for each port of a double-acting 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
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50554—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure downstream of the pressure control means, e.g. pressure reducing 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
    • F15B2211/50—Pressure control
    • F15B2211/52—Pressure control characterised by the type of actuation
    • F15B2211/528—Pressure 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
    • F15B2211/50—Pressure control
    • F15B2211/57—Control of a differential 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
    • F15B2211/635—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements
    • F15B2211/6355—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements having valve means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F15B2211/7142—Multiple output members, e.g. multiple hydraulic motors or cylinders the output members being arranged in multiple groups

Definitions

  • the present invention relates to a fluid pressure circuit having a pilot operated control valve.
  • the hydraulic shovel as a construction machine is provided with a lower traveling body 11 equipped with a traveling motor, a rotating motor 12 of a rotating part 12 and a rotating motor.
  • the upper turning body 13 is provided so as to be rotatable.
  • the upper turning body 13 has the boom 14 of the front working machine and the boom cylinder 15 has the upper turning body 13.
  • the boom 14 is supported by a stick 16 force S at the end of the boom 14 and is turned inward and outward by a stick cylinder 17. It is pivotally supported in the moving position, and the tip of the stick 16 is pivoted in the opening and closing directions by a bucket 18 force S and a bucket cylinder 19 at the tip of the stick 16. It is pivoted.
  • a boom cylinder is installed on the left and right pump lines of the hydraulic shovel.
  • a second stick control valve and a second stick control valve are provided, and the stick is adjusted in accordance with the boom lifting pilot pressure supplied to the boom first control valve. Shows the hydraulic circuit of the construction machine in which the stick's in-lot pressure supplied to the second control valve is controlled to be reduced by the pressure reducing valve. It is.
  • the pressure reducing valve used in the hydraulic circuit of the construction machine disclosed in Japanese Utility Model Registration No. 25799587 is shown in FIG.
  • Boom lift supplied to the boom 1st control valve The stick supplied to the stick 2nd control valve as the pipe pressure rises
  • the quinn rod pressure is gradually reduced, and near the full lever operation position of the boom control valve, the boom lift pressure is reduced.
  • the pressure reducing valve has the characteristic of reducing the stick-in-no-rot pressure to 0, so the second stick control valve is used.
  • the boom first spool 21, the stick second spool 24, and the bucket spool 25 are connected to one hydraulic pressure source 26, Hydraulic oil is supplied from this oil pressure source 26.
  • the boom second spool 22 and the stick first spool 23 are connected to the other hydraulic pressure source 27, and the hydraulic pressure source 27 is connected to the other hydraulic pressure source 27.
  • Each hydraulic pressure source 26, 27 supplies hydraulic oil to each spool via the respective parallel passage 28, and each spool is placed in the neutral position. At that time, they are connected to the tank 30 via the respective binos passages 29.
  • the boom lift-up nodal pressure action section of the first boom spool 21 and the neurot pressure action section of the second boom spool 22 include: The boom lift from the boom remote control valve 31 and the throttle lines 32 and 33 are connected respectively, and PT / JP03 / 00037
  • the socket closet opening of the socket spout control port is equipped with a bucket remote control valve. To close noise line 35 is connected.
  • Bucket Remote control valve 34 A block from the valve to the bucket closing nozzle of the socket spooner 25.
  • a pressure reducing valve 36 of an external port type is provided in the close noise lot line 35.
  • the boom remote control valve 31 and the boom connected to the boom port 1 of the boom 1st spool 21 The boom-up signal pressure line 37 is branched from the up-noise mouth line 32, and this branched boom-up signal pressure line 3 7 is led to the signal pressure action section of the pressure reducing valve 36.
  • the pressure reducing valve 36 of the external nozzle type is provided with a boom remote control valve 31 and a boom lifter of the boom 1st spool 21. Lifting the boom that acts on the ilot pressure action part, and the bucket remote control valve according to the norobot pressure. The bucket close pilot pressure acting on the bucket close pilot operating part is reduced in pressure.
  • the socket spool 25 is composed of the first and second booms 21 and 22 and the first and second booms. Since it is not composed of two parts like the punole 23 and stick No. 2 pool 24, it is composed of only one part.
  • the bucket is operated by the pressure reducing valve 36 having the characteristics shown in FIG. To / from the socket 25 • Closed Norolet pressure S Once cut, only the bucket 25 is neutral. Bucket cylinder 19 will not move due to return to position, causing a problem
  • the problem is that not only the packet spool 25 but also the rotating motor control valve and the bucket that control the rotating motor can be mounted instead of the bucket.
  • the present invention has been made in view of such a point, and when a plurality of fluid pressure actuators are operated simultaneously, one fluid pressure actuator is operated. Reducing the pressure reducing valve to ensure the operation of the actuator may impair the operation of other fluid actuators.
  • the purpose is to provide a fluid pressure circuit that can Uncovering the invention
  • the fluid pressure circuit of the present invention comprises one pipe-operated control valve for controlling one fluid pressure actuator and one fluid pressure actuator.
  • Other pipe working type control valves that control other fluid pressure actuators that operate at the same time as the actuator, and one pilot operation
  • a pressure reducing valve that can control the pressure of the pilot valve, and when the pilot pressure supplied to one pilot operated control valve is higher than a certain pressure, the pressure of the pressure reducing valve is reduced.
  • the pressure reducing valve supplies the pilot pressure to one of the pilot operated control valves preferentially. It is possible to ensure that one fluid pressure puck, which requires a sufficient fluid volume, can be operated, and that one nozzle-operated type can be operated. If the pilot pressure supplied to the control valve is higher than a certain pressure, the pressure reducing control function of the pressure reducing valve is limited by the pressure reducing valve control means, and other functions are performed. Since it is possible to supply the nozzle pressure to secure the opening area required for the neurot type operation control valve of this type, other fluid pressure valves can be supplied.
  • the pressure-reducing valve control means in the fluid pressure circuit of the present invention which can ensure the necessary operation of the heater stably, includes: In a range where the pilot pressure supplied to one pilot operated control valve is lower than a certain pressure, the control signal pressure is maintained without changing the pilot pressure. And a direct control characteristic section that outputs to the pressure reducing valve.
  • the pilot pressure S supplied to the pilot-operated control valve S in the range above the fixed pressure. It has a constant pressure control characteristic part for outputting a control signal pressure reduced to a constant V to pressure to the pressure reducing valve even if the pilot pressure changes.
  • the direct control characteristic part of the pressure reducing valve control means causes the pressure reducing valve to have its original function.
  • one fluid pressure actuator can be reliably operated, and one nozzle-operated control valve. If the pressure at the nozzle port supplied to the pressure regulator is higher than a certain pressure, the pressure reduction control function of the pressure reducing valve is restricted by the constant pressure control characteristic part of the pressure reducing valve control means. The required operation of the fluid pressure actuator can be stably secured.
  • One pilot-operated control valve and another pilot-operated control valve in the fluid pressure circuit of the present invention supply working fluid from a common fluid pressure source.
  • the other fluid pressure actuator is a fluid pressure circuit in which the one fluid pressure actuator is assumed to be a lighter load actuator.
  • the pressure reducing valve uses the working fluid supplied from the fluid pressure source.
  • One pipe-operated control valve in the fluid pressure circuit of the present invention is a control valve for controlling a boom cylinder of a hydraulic shovel.
  • the other pilot operated control valve is a control valve that is installed in a one-to-one relationship with the other fluid pressure actuators of the hydraulic pressure level.
  • the fluid pressure circuit is assumed to be a hydraulic fluid pressure circuit, and the hydraulic pressure boom cylinder and the other fluid pressure actuators are operated at the same time.
  • the boom cylinder needs a sufficient amount of oil by giving priority to the pipe port pressure to the control valve for the boom cylinder.
  • the cylinder can be operated reliably, and the other pilot operated control valve can be used for other fluid pressure actuators.
  • FIG. 1 is a circuit diagram showing an embodiment of a fluid pressure circuit according to the present invention.
  • FIG. 2 is a circuit diagram showing a pressure reducing valve control means used in the fluid pressure circuit.
  • FIG. 3 is a characteristic diagram showing the control characteristics of the pressure reducing valve, and
  • FIG. 3 is a characteristic diagram showing the pressure reducing characteristics of the pressure reducing valve used alone in the fluid pressure circuit, and
  • FIG. 5 is a characteristic diagram showing a combination characteristic of a valve control means and a pressure reducing valve.
  • FIG. 5 is a side view of a hydraulic shovel
  • FIG. 6 is a diagram showing a conventional hydraulic circuit.
  • FIG. 7 is a characteristic diagram showing the pressure-reducing characteristics of the stick-in port pressure with respect to the boom-up port pressure of the pressure-reducing valve, and Fig. 7 shows the assumptions of the present invention.
  • a hydraulic circuit using a pressure reducing valve in the bucket nozzle outlet line is shown. is there .
  • FIG. Fig. 1 shows a hydraulic circuit as a hydraulic circuit installed on a hydraulic shovel as a construction machine.
  • the same parts as those in the hydraulic shovel shown in FIG. 5 are denoted by the same reference numerals.
  • this hydraulic circuit is one of the pipes that controls the boom cylinder 15 as one of the fluid pressure actuators.
  • Boo as a port-operated control valve PT / JP03 / 00037
  • the bucket spool 25 is a pipe-operated center bin. It is a snorve.
  • the first spool 21 of the boom, the second spool 24 of the stick, and the bucket spool 25 are one of the common fluid pressure sources.
  • the hydraulic pressure source 26 is connected to the hydraulic pressure source 26 and receives a supply of hydraulic oil as a working fluid from the hydraulic pressure source 26.
  • the one spool 23 is connected to the other hydraulic pressure source 27 and receives the supply of hydraulic oil from this hydraulic pressure source 27.
  • Each hydraulic pressure source 26, 27 supplies hydraulic oil to each spool via the respective parallel passage 28, and when each spool is in the neutral position.
  • each tank is connected to a tank 30 via a respective bypass passage 29.
  • the bucket cylinder 19 that rotates the bracket is lower in load than the high-load boom cylinder 15 that supports the load of the entire front work machine.
  • the socket spool 25 that controls the socket cylinder 19 is an actuator. This is a control valve installed in a one-to-one relationship with the socket cylinder 19.
  • Boom uppipe for boom 1st spoonhole 21 and pressure section for boom and 2nd spoon 22 boom is provided with a boom lifting pipe line 32, 33 in the port pressure operating section. Each of them is connected to the bucket-closing pilot pressure acting portion of the bucket spool 25, and the bucket as a bucket operation valve is provided. A bucket close lot line 35 from the tri-mo valve 34 is connected.
  • the boom lowering port of the first boom 1 spool 21 has a boom lowering knob with a boom remote control valve 31.
  • a train (not shown) is connected, and the bucket open-pipe port pressure operation section of the bucket spool 25 has a bucket tree.
  • the socket open-no-rot line (not shown) of the motor valve 3-4 is connected, and the first spool 23 of the stick is connected.
  • K. Outno Lock door La Lee emissions (not Shimese the figure) is connected.
  • the operation in the direction of the arrow shown in FIG. 1 is a boom raising operation
  • the operation in the direction of the arrow is a socket-close operation.
  • Bucket remote control valve 3 4 force, bucket closer 25 bucket close / bucket reaching to the pressure action section ⁇ Inside the close pilot line 35, a pressure reducing valve 36 of an external pipe type is provided.
  • the boom remote control valve 31 is connected to the boom lift port of the first boom 1 spool 21 and the boom lift pie port connected to the pressure action section.
  • the boom-up signal pressure line 37 is branched from the train 32, and the branched boom-up signal pressure line 37 is used as pressure reducing valve control means.
  • the control signal pressure line 39 connected to the primary side of all the pressure reducing valves 38 and drawn out from the secondary side of the pressure reducing valve 38 controls the control signal pressure of the pressure reducing valve 36. It is connected to the working part.
  • This pressure reducing valve 38 has characteristics as shown in FIG. In FIG. 2, the abscissa represents the primary-side boom up-nozzle pressure input to the pressure reducing valve 38, and the ordinate represents the pressure reducing valve 38.
  • the control signal pressure to the controlled secondary pressure, that is, the pressure reducing valve 36 is shown, and the boom is raised. Even if the pilot pressure becomes higher than the pilot pressure SPa, the control signal pressure does not become higher than Pa.
  • the pressure reducing valve 38 is connected to the boom upper spool 21 when the boom upper nozzle pressure supplied to the boom first spool 21 is lower than a predetermined pressure.
  • a direct control function that outputs the pressure from the pilot port to the pressure reducing valve 36 as it is as a control signal pressure 00037
  • the boom lift pipe pressure supplied to the boom first spool 21 is higher than a certain pressure. Even if the boom lifting pipe pressure changes, a control signal pressure reduced to a constant limit pressure is output to the pressure reducing valve 36 even if the pressure changes. And functions as a limiter for the external pilot control signal of the pressure reducing valve 36.
  • the pressure reducing valve 36 in the socket close pilot line 35 is connected to a boom-up signal pressure line 37 as shown in FIG.
  • the bucket remote control valve 34 In response to the control signal pressure output from the pressure reducing valve 38, the bucket remote control valve 34, the bucket of the socket spool 25, and the like. It controls the bucket close noise pressure supplied to the loose pipe mouth pressure acting part by reducing the pressure.
  • the combination of the pressure reducing valve 36 and the pressure reducing valve 38 is, as shown in FIG. Even if the pilot pressure rises above a certain pressure Pa near the full lever operation position of the boom remote control valve 31, the nozzle of the socket spool 25 does not G. Close.
  • the socket-closed nozzle pressure supplied to the pilot-pressure operating section is required to operate the socket cylinder 19.
  • the bucket close pie port pressure Pb which can secure a certain opening area of the socket spool, is kept from being lower than the pressure Pb.
  • the bucket remote control valve 34 When the boom remote control valve 31 of the hydraulic pressure shovel is operated to the boom raising side, the bucket remote control valve 34 is simultaneously bucketed. Operate the close side to extend the boom cylinder 15 and the bucket cylinder 19 at the same time, and move the hydraulic shovel over the boom.
  • the boom that has been branched from the boom-up nozzle line 32 The boom lifting port pressure acts on the pressure reducing valve 38 by the rising signal pressure line 37, and the pressure reducing valve 38 controls the characteristics shown in FIG. Outputs signal pressure.
  • the pressure reducing valve 38 is connected to the boom lift pipe from the boom remote control valve 31. Since the lot pressure is output to the control signal pressure action section of the pressure reducing valve 36 as it is as the control signal pressure, the packet remote control valve 34 Through the pressure reducing valve 36 The bucket close / pilot pressure supplied to the bucket / close / pull pressure operating section of pool 25 is shown in Fig. 4. As shown, the decompression characteristics of FIG. 3 remain as they are.
  • the pressure at the pipe outlet is given priority to the boom 1st spoonhole 21 from the bucket spool 25 by the pressure reducing valve 36.
  • the hydraulic fluid supplied from the common hydraulic pressure source 26 passes through the first spool 21 of the boom and passes through the bucket cylinder 19.
  • the close noise pressure Pb is necessary for operating the / ket cylinder 19 to perform the close / close operation. It is a pilot pressure that can secure a certain fixed bucket spool opening area.
  • the bucket spool 25 is provided in a one-to-one relationship with the bucket cylinder 19, and the bucket clone 25 is provided. ⁇
  • the pressure reducing valve is
  • the bucket cylinder 19 is used for the bucket close from the pressure reducing valve 36 whose pressure is regulated by the constant pressure control characteristic section 38 b of 38.
  • the minimum packet / close noise pressure Pb required for operation can be supplied, so the required packet / cloth is required. Can be ensured stably.
  • the pressure reducing valve 36 having the pressure reducing characteristics as shown in FIG. 3 is assembled in the socket 'close pilot line 35'.
  • the pressure of the pressure reducing valve 36 is controlled by the outlet pressure of the boom to the first spool 21 of the boom, and the bucket is controlled by the bucket.
  • the bucket closes to the tray spout No. 25 Even if the interlocking operation such as controlling the pressure to reduce the pressure of the bucket is performed, Since the above-described pressure reducing valve 38 having the characteristics shown in FIG. 2 is incorporated in the signal pressure line 37, the control signal pressure to the pressure reducing valve 36 is shown in FIG.
  • the bucket close / eject pressure to the bucket spool 25 is required to operate the bucket cylinder 19. Since the bucket close pressure is lower than the bucket close-out pressure Pb that can secure a certain fixed bucket spool opening area, As before, the bucket is connected to the bucket spout 25 by the pressure reducing valve 36. The closing pipe pressure is completely cut off. The bucket spool 25 does not return to the neutral position, and the bucket cylinder 19 power S power does not disappear. o
  • the boom lift and As described in the case of the socket close similarly, the swivel motor control that is controlled by a single spool is used. If the same pressure reducing valve 36 is used for the pilot line of the spool that controls other actuators such as By installing a pressure reducing valve 38 as shown in Fig. 2 on the control signal pressure line 39 of the pressure reducing valve 36, similar effects can be expected. it can . Possibility of industrial use
  • the main fluid pressure circuit operates not only construction machines such as hydraulic shovels, but also, if necessary, a plurality of fluid pressure actuators at the same time.
  • the pressure reducing valve to ensure the operation of one fluid pressure actuator will impair the operation of the other fluid pressure actuator. In such cases, it can be widely applied to solve the problem.

Abstract

La présente invention concerne un circuit hydraulique dans lequel une pression pilote exercée sur une bobine de godet (25) pour commander un vérin de godet (19) est réduite de manière contrôlée au moyen d'une valve de réduction de pression (36) qui est commandée par une pression de signal de commande dérivée d'une pression pilote sur une première bobine de flèche (21) permettant de commander un vérin de flèche (15). La pression de signal de commande est commandée par une valve de réduction de pression (38) qui produit la pression pilote inchangée sur la valve de réduction de pression (36) sous forme de pression de signal de commande dans un domaine où la pression pilote de la première bobine de flèche (21) est inférieure à une pression indiquée et, dans un domaine où la pression pilote de la première bobine de flèche (21) est supérieure à la pression indiquée, produit une pression de signal de commande réduite à une pression limite indiquée sur la valve de réduction de pression (36), même si la pression pilote est modifiée.
PCT/JP2003/000037 2002-02-12 2003-01-07 Circuit hydraulique WO2003069164A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2002034097A JP2003232303A (ja) 2002-02-12 2002-02-12 流体圧回路
JP2002-34097 2002-02-12

Publications (1)

Publication Number Publication Date
WO2003069164A1 true WO2003069164A1 (fr) 2003-08-21

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ID=27678016

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2003/000037 WO2003069164A1 (fr) 2002-02-12 2003-01-07 Circuit hydraulique

Country Status (2)

Country Link
JP (1) JP2003232303A (fr)
WO (1) WO2003069164A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1416096A1 (fr) * 2002-10-31 2004-05-06 Kobelco Construction Machinery Co., Ltd. Circuit hydraulique pour pelle hydraulique
CN107023533A (zh) * 2017-06-22 2017-08-08 合肥工业大学 一种用于弹性轴承多维刚度测试的液压控制系统

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JP5150529B2 (ja) * 2009-02-10 2013-02-20 川崎重工業株式会社 パイロット切換機構付き流量制御弁
JP5475507B2 (ja) * 2010-02-28 2014-04-16 住友建機株式会社 油圧ショベルの油圧制御装置
KR102561435B1 (ko) * 2016-08-31 2023-07-31 에이치디현대인프라코어 주식회사 건설기계의 제어 시스템 및 건설기계의 제어 방법
JP7207060B2 (ja) * 2019-03-22 2023-01-18 コベルコ建機株式会社 作業機械の油圧駆動装置

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EP1172488A1 (fr) * 1999-12-22 2002-01-16 Shin Caterpillar Mitsubishi Ltd. Circuit hydraulique de machine de travaux publics

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JPS58176328A (ja) * 1982-04-06 1983-10-15 Kobe Steel Ltd 油圧シヨベルの油圧回路
JPS61103603U (fr) * 1984-12-11 1986-07-01
JPH01250531A (ja) * 1988-03-30 1989-10-05 Hitachi Constr Mach Co Ltd 作業機の油圧制御回路
JPH0517202U (ja) * 1991-08-22 1993-03-05 東芝機械株式会社 油圧駆動装置
JP2579587Y2 (ja) * 1993-12-27 1998-08-27 新キャタピラー三菱株式会社 建設機械の油圧回路
JPH08302752A (ja) * 1995-04-28 1996-11-19 Sumitomo Constr Mach Co Ltd 油圧ショベルのブーム上げ優先油圧回路
JPH093960A (ja) * 1995-06-21 1997-01-07 Sumitomo Constr Mach Co Ltd 油圧ショベルのロードセンシング油圧回路
EP1172488A1 (fr) * 1999-12-22 2002-01-16 Shin Caterpillar Mitsubishi Ltd. Circuit hydraulique de machine de travaux publics

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EP1416096A1 (fr) * 2002-10-31 2004-05-06 Kobelco Construction Machinery Co., Ltd. Circuit hydraulique pour pelle hydraulique
CN107023533A (zh) * 2017-06-22 2017-08-08 合肥工业大学 一种用于弹性轴承多维刚度测试的液压控制系统
CN107023533B (zh) * 2017-06-22 2018-03-16 合肥工业大学 一种用于弹性轴承多维刚度测试的液压控制系统

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