WO2014103273A1 - 油圧制御装置及びこれを備えた建設機械 - Google Patents
油圧制御装置及びこれを備えた建設機械 Download PDFInfo
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- WO2014103273A1 WO2014103273A1 PCT/JP2013/007511 JP2013007511W WO2014103273A1 WO 2014103273 A1 WO2014103273 A1 WO 2014103273A1 JP 2013007511 W JP2013007511 W JP 2013007511W WO 2014103273 A1 WO2014103273 A1 WO 2014103273A1
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- Prior art keywords
- boom
- arm
- cylinder
- hydraulic pump
- hydraulic
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- 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
- E02F3/425—Drive systems for dipper-arms, backhoes or the like
-
- 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
- E02F3/30—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 with a dipper-arm pivoted on a cantilever beam, i.e. boom
- E02F3/32—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 with a dipper-arm pivoted on a cantilever beam, i.e. boom working downwardly and towards the machine, e.g. with backhoes
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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
- E02F9/2232—Control of flow rate; Load sensing arrangements using one or more variable displacement pumps
- E02F9/2235—Control of flow rate; Load sensing arrangements using one or more variable displacement pumps including an electronic controller
-
- 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
- E02F9/2242—Control of flow rate; Load sensing arrangements using two or more pumps with cross-assistance including an electronic controller
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
- E02F9/2267—Valves or distributors
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2278—Hydraulic circuits
- E02F9/2285—Pilot-operated systems
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2278—Hydraulic circuits
- E02F9/2292—Systems with two or more pumps
-
- 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
- E02F9/2296—Systems with a variable displacement pump
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- 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
- F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
-
- 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
- F15B2211/2053—Type of pump
- F15B2211/20538—Type of pump constant capacity
-
- 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
- F15B2211/2053—Type of pump
- F15B2211/20546—Type of pump variable capacity
-
- 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
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- 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
- F15B2211/31523—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source and an output member
- F15B2211/31535—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source and an output member having multiple pressure sources and a single output member
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- 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
- F15B2211/411—Flow control characterised by the positions of the valve element the positions being discrete
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- 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
- F15B2211/41509—Flow control characterised by the connections of the flow control means in the circuit being connected to a pressure source and a directional control valve
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- 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
- F15B2211/6313—Electronic controllers using input signals representing a pressure the pressure being a load pressure
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- 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
- F15B2211/665—Methods of control using electronic components
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- 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
Definitions
- the present invention relates to a hydraulic control device that controls the drive of a boom cylinder and an arm cylinder of a construction machine.
- the boom cylinder for operating the boom and the arm cylinder for operating the arm are driven by different hydraulic pumps (first hydraulic pump, second hydraulic pump).
- first hydraulic pump second hydraulic pump
- a part of the oil from the first hydraulic pump for the boom cylinder is joined to the arm cylinder by the merging valve, so that the arm pushing operation is accelerated and the working efficiency at the time of the combined operation is improved.
- the boom lowering operation is a lower load operation than the arm pushing operation because the weight of the boom is added. Therefore, in the combined operation of the boom lowering and the arm pushing, the oil from the first hydraulic pump is on the low load side. It flows preferentially to the boom cylinder.
- the object of the present invention is to make it possible to reliably join the hydraulic oil discharged from the first hydraulic pump to the arm cylinder during the combined operation of pushing the arm and lowering the boom, and to improve the energy efficiency. It is providing a device and a construction machine provided with the same.
- the present invention provides a boom that is attached to a base machine so as to be able to be lifted and lowered by pivoting about a boom foot pin, and is capable of being pushed and pulled with respect to the tip of the boom
- An attached arm a boom cylinder for raising and lowering the boom, an arm cylinder for pushing and pulling the arm, a first hydraulic pump and a second hydraulic pump as hydraulic sources for both cylinders,
- a boom cylinder circuit that connects the first hydraulic pump and the boom cylinder, an arm cylinder circuit that connects the second hydraulic pump and the arm cylinder, and a hydraulic oil for the boom cylinder provided in the boom cylinder circuit
- a boom control valve for controlling the supply and discharge of the engine and the arm cylinder circuit.
- An arm control valve for controlling supply and discharge of hydraulic oil to and from the arm cylinder, a boom operation means for operating the boom control valve, an arm operation means for operating the arm control valve, and the boom use
- a merging circuit connected to the boom cylinder circuit in a state branched from the boom cylinder circuit at a branch connection point upstream of the control valve, and merging discharged oil from the first hydraulic pump into the arm cylinder; and the boom A boom operation detector for detecting the presence or absence of a boom lowering operation by the operating means, an arm operation detector for detecting the presence or absence of an arm pushing operation by the arm operating means, and a branch connection point of the junction circuit in the boom cylinder circuit
- the boom control valve Both, a merging switching valve that can be switched between a supply position where hydraulic oil can be supplied from the first hydraulic pump to the boom control valve and a cutoff position where the supply of hydraulic oil is shut off, and hydraulic oil in the tank
- a replenishment circuit having a replenishment valve that replenishes the rod side chamber of the boom cylinder,
- the present invention is a construction machine, wherein a base machine, a boom attached to the base machine so as to be able to be lifted and lowered by pivoting about a boom foot pin, and a push-pull operation with respect to the boom.
- a construction machine comprising an attached arm and the hydraulic control device for controlling the operation of the boom and the arm.
- the hydraulic oil discharged from the first hydraulic pump can be reliably joined to the arm cylinder, and energy efficiency can be improved.
- a hydraulic excavator 1 as an example of a construction machine according to the first embodiment travels in a lower part so that it can turn around a lower traveling body 2 having a crawler 2a and an axis perpendicular to the ground.
- a base machine constituted by an upper swing body 3 provided on the body 2, an attachment 4 provided so as to be able to rise and fall with respect to the upper swing body 3, and a hydraulic control device 5 for controlling the operation of the attachment 4 ( 2).
- the attachment 4 can be pivoted about a horizontal axis with respect to the boom 6 attached to be able to be raised and lowered (raised and lowered) by pivoting around a boom foot pin (not shown) with respect to the upper swing body 3 and the tip of the boom 6.
- An attached arm 7 and a bucket 8 attached so as to be rotatable around a horizontal axis with respect to the tip of the arm 7 are provided.
- the attachment 4 also has a boom cylinder 9 for raising and lowering the boom 6 with respect to the upper swing body 3, an arm cylinder 10 for pushing and pulling the arm 7, and a bucket 8 rotating with respect to the arm 7. And a bucket cylinder 11 for causing the
- the hydraulic control device 5 connects the boom cylinder 9, the arm cylinder 10, the first hydraulic pump 14 and the second hydraulic pump 15 driven by an engine (not shown), and the first hydraulic pump 14 and the boom cylinder 9.
- the boom cylinder circuit 16, the arm cylinder circuit 18 that connects the second hydraulic pump 15 and the arm cylinder 10, and the joining fluid that branches the discharge oil of the first hydraulic pump 14 from the boom cylinder circuit 16 and joins the arm cylinder circuit 18.
- a pressure sensor 20 and an arm relay as arm operating means for pushing and pulling the arm 7.
- the first hydraulic pump 14 is a variable displacement hydraulic pump having a pump regulator 14a whose capacity can be adjusted.
- the boom cylinder circuit 16 includes a boom control valve 24 for controlling supply and discharge of hydraulic oil to and from the boom cylinder 9, and a merging switching valve 25 provided between the boom control valve 24 and the first hydraulic pump 14. And a pressure sensor 27 for detecting the pressure in the rod side chamber of the boom cylinder 9.
- the boom control valve 24 has a neutral position P1 for stopping the operation of the boom cylinder 9, a boom lowering position P2 for lowering the boom 6 (reducing the boom cylinder 9), and raising the boom 6 (boom cylinder 9). And a boom raising position P3 for extending the movement of the boom.
- the merging switching valve 25 can be switched between a supply position P4 where the hydraulic oil can be supplied from the first hydraulic pump 14 to the boom control valve 24 and a cutoff position P5 where the supply of hydraulic oil is shut off.
- the junction switching valve 25 is normally biased to the supply position P4.
- a throttle may be provided in the flow path at the supply position P4 of the merging switching valve 25.
- the replenishing valve 26a is a check valve that allows the flow from the tank W toward the boom cylinder 9 when the rod side chamber of the boom cylinder 9 is going to be negative pressure, while restricting the flow in the opposite direction.
- the junction circuit 17 is connected to the boom cylinder circuit 16 in a state where it branches off from the boom cylinder circuit 16 at a position (branch connection point) between the first hydraulic pump 14 and the junction switching valve 25. As a result, the hydraulic oil discharged from the first hydraulic pump 14 is also guided to the arm cylinder 10 side.
- the merging circuit 17 is provided with a first arm control valve 29 for controlling supply and discharge of hydraulic oil to and from the arm cylinder 10.
- the arm cylinder circuit 18 is provided with a second arm control valve 28 for controlling the supply and discharge of the hydraulic oil to and from the arm cylinder 10.
- the second arm control valve 28 is provided between the second hydraulic pump 15 and the arm cylinder 10.
- Each of the arm control valves 28 and 29 includes a neutral position P6 for stopping the operation of the arm cylinder 10, an arm pushing position P7 for causing the arm 7 to perform a pushing operation (reducing the arm cylinder 10), and an arm 7 And an arm pulling position P8 for extending the arm cylinder 10 and is switched by the arm remote control valve 21.
- the controller 23 outputs a command B to the solenoid of the merging switching valve 25 based on the detection value A by the pilot pressure sensor 20, the detection value D by the pilot pressure sensor 22, and the detection value C by the pressure sensor 27.
- a capacity command is output to the pump regulator 14a of the hydraulic pump 14.
- step S1 it is determined whether or not there is a boom lowering operation by the pilot pressure sensor 20 (step S1). If it is determined that there is a boom lowering operation (YES in step S1), it is determined by the pilot pressure sensor 22 whether there is an arm pressing operation (step S2).
- step S2 it is determined whether or not a combined operation of lowering the boom and pushing the arm is performed in steps S1 and S2.
- the combined operation is performed (determined as YES in step S2)
- the merging switching valve 25 is maintained at the supply position P4
- the hydraulic oil from the first hydraulic pump 14 is supplied to the arm cylinder 10. Rather than the boom cylinder 9. This is because the boom lowering operation is a relatively low load operation with respect to the arm pushing operation.
- the merging switching valve 25 is switched to the cutoff position P5 (step S3).
- the flow of hydraulic oil from the first hydraulic pump 14 to the boom cylinder 9 is blocked, so that the hydraulic oil from the first hydraulic pump 14 can be reliably supplied to the arm cylinder 10.
- the merging switching valve 25 is switched to the shut-off position P5
- the supply of hydraulic oil to the rod side chamber of the boom cylinder 9 stops, but the hydraulic oil is sucked into the rod side chamber from the tank W through the supply valve 26a. The Thereby, cavitation of the boom cylinder 9 can be prevented.
- step S1 and / or step S2 that is, when an operation other than the combined operation of lowering the boom and pushing the arm is performed, or when neither the boom operation nor the arm operation is performed.
- the junction switching valve 25 is switched to the supply position P4 (the output of the command B is stopped: step S4). Thereby, it becomes a normal circuit state except at the time of combined operation of boom lowering and arm pushing.
- This normal circuit state includes the circuit state during single operation of lowering the boom and single operation of pushing the arm. In this state, the hydraulic oil discharged from the first hydraulic pump 14 can be supplied to the operated boom cylinder 9 or arm cylinder 10.
- step S4 the merging switching valve 25 is switched to the supply position P4 in a state where an operation other than the combined operation of lowering the boom and pushing the arm is performed.
- the merging switching valve 25 is switched to the cutoff position P5.
- the supply of hydraulic oil from the first hydraulic pump 14 to the boom control valve 24 (boom cylinder 9) is stopped during the combined operation, and the hydraulic oil from the first hydraulic pump 14 is armed via the junction circuit 17.
- the cylinder 10 can be reliably supplied.
- the arm pushing operation can be sufficiently accelerated.
- energy is saved.
- Steps S1 and S2 are the same as in the first embodiment.
- step S5 it is determined by the pressure sensor 27 whether or not the pressure in the rod side chamber of the boom cylinder 9 is equal to or lower than a predetermined value (reference pressure) (step S5).
- step S5 it is determined whether or not the boom cylinder 9 is required to have a downward force.
- the bucket 8 is moved along the slope by performing a combined operation of lowering the boom and pushing the arm. In this case, since it is necessary to press the bucket 8 against the slope, a force in the boom lowering direction is required.
- step S5 when the force in the boom lowering direction is not required as in the dumping work (in the case of YES at step S5), the merging switching valve 25 is switched to the cutoff position P5 (step S3). On the other hand, when the force in the boom lowering direction is required (NO in step S5), the merging switching valve 25 is switched to the supply position P4 (step S4).
- the operation requiring a force in the boom lowering direction (operation in which a load is applied to the boom cylinder) can be reliably performed.
- the controller 23 performs the first operation based on the boom single operation characteristic T1 in which the capacity increases in accordance with the increase in the operation amount of the boom remote control valve 19 during the single operation of lowering the boom.
- the capacity of the hydraulic pump 14 is controlled.
- the controller 23 performs the first operation based on an arm single operation characteristic T2 in which the capacity increases in accordance with an increase in the operation amount of the arm remote control valve 21 during the single operation of pushing the arm. 1
- the capacity of the hydraulic pump 14 is controlled.
- the controller 23 has a composite operation characteristic in which the capacity decreases as the operation amount of the boom remote control valve 19 increases as shown in FIG.
- the capacity of the first hydraulic pump 14 is determined based on T3.
- the combined operation characteristic T3 is set so that the relationship between the operation amount and the capacity of the boom remote control valve 19 is reversed with respect to the boom single operation characteristic T1 with a preset reference operation amount E as a boundary.
- the capacity of the first hydraulic pump 14 is made larger than when determining the capacity based on the boom single operation characteristic T1.
- the controller 23 sets a smaller capacity among the capacity based on the combined operation characteristic T3 and the capacity based on the arm single operation characteristic T2 as the capacity of the first hydraulic pump 14. Thereby, when the operation amount of the arm remote control valve 21 is small, the capacity of the first hydraulic pump 14 can be further reduced, so that the energy saving effect can be improved.
- the capacity of the first hydraulic pump 14 may be limited to be small depending on the operation amount of the boom remote control valve 19. This is to reproduce the situation in which excess hydraulic oil is supplied from the first hydraulic pump 14 to the boom cylinder 9 as in the prior art. By doing so, the same energy efficiency effect as that of the conventional one can be obtained. An operational feeling can be provided to the operator.
- the restriction of the capacity (flow rate) of the first hydraulic pump 14 described above can be executed after step S3 for switching the merging switching valve 25 to the cutoff position P5, for example, as shown in step S6 in FIG.
- step S4 for switching the junction switching valve 25 to the supply position P4 it is possible to return to the flow rate control (step S7) according to the operation amount.
- step S6 may be executed after step S2 in the first embodiment (FIG. 3) or after step S5 in the second embodiment (FIG. 4) and before step S3.
- step S7 may be executed after step S2 is determined as NO and before step S4.
- the capacity increases according to the operation amount means that the range including the minimum and / or maximum of the lever operation amount as shown in FIGS. This is to allow the dead zone to be set.
- the combined operation characteristic T3 in the third embodiment is set so that the capacity decreases according to the boom lowering operation amount, but the combined operation characteristic is not limited thereto.
- the capacity may be set lower than the capacity based on the boom single operation characteristic T1 in a range where the boom lowering operation amount is larger than the reference operation amount E.
- the combined operation characteristic T4 shown in FIG. 9 is set so that the capacity increases as the boom lowering operation amount increases in a range where the boom lowering operation amount is smaller than the reference operation amount E.
- the capacity is set constant in a range where the boom lowering operation amount is larger than the reference operation amount E.
- the present invention provides a boom that is attached to a base machine so as to be able to be lifted and lowered by pivoting about a boom foot pin, and is capable of being pushed and pulled with respect to the tip of the boom
- An attached arm a boom cylinder for raising and lowering the boom, an arm cylinder for pushing and pulling the arm, a first hydraulic pump and a second hydraulic pump as hydraulic sources of the cylinders,
- a boom cylinder circuit that connects the first hydraulic pump and the boom cylinder, an arm cylinder circuit that connects the second hydraulic pump and the arm cylinder, and a hydraulic oil for the boom cylinder provided in the boom cylinder circuit
- a boom control valve for controlling the supply and discharge of the engine and the arm cylinder circuit.
- An arm control valve for controlling supply and discharge of hydraulic oil to and from the arm cylinder, a boom operation means for operating the boom control valve, an arm operation means for operating the arm control valve, and the boom use
- a merging circuit connected to the boom cylinder circuit in a state branched from the boom cylinder circuit at a branch connection point upstream of the control valve, and merging discharged oil from the first hydraulic pump into the arm cylinder; and the boom A boom operation detector for detecting the presence or absence of a boom lowering operation by the operating means, an arm operation detector for detecting the presence or absence of an arm pushing operation by the arm operating means, and a branch connection point of the junction circuit in the boom cylinder circuit
- the boom control valve Both, a merging switching valve that can be switched between a supply position where hydraulic oil can be supplied from the first hydraulic pump to the boom control valve and a cutoff position where the supply of hydraulic oil is shut off, and hydraulic oil in the tank
- a replenishment circuit having a replenishment valve that replenishes the rod side chamber of the boom cylinder,
- the merge switching valve is switched to the shut-off position when a combined operation of lowering the boom and pushing the arm is detected.
- the arm pushing operation can be sufficiently accelerated.
- energy is saved.
- the merging switching valve is switched to the supply position, thereby supplying hydraulic oil from the first hydraulic pump to the operated cylinder. It becomes possible to do.
- the hydraulic control device further includes a pressure detector that detects a pressure in a rod side chamber of the boom cylinder, and the controller detects the combined operation by the operation detectors, and the pressure detector
- the combined switching valve When the detected pressure is equal to or lower than a preset reference pressure, the combined switching valve is set to the shut-off position, while the combined operation is detected by the operation detectors and detected by the pressure detector.
- the merging switching valve is preferably switched to the supply position.
- the work that requires force in the boom lowering direction (work that causes a load on the boom cylinder) can be reliably performed.
- the first hydraulic pump is a variable displacement hydraulic pump
- the boom operation detector can detect an operation amount of the boom operation means
- the controller includes the boom
- the capacity of the first hydraulic pump is controlled based on the boom independent operation characteristic in which the capacity increases in accordance with an increase in the operation amount of the boom operation means during the single operation of lowering, while the merging switching valve is set to the shut-off position. Under the switching condition, when the boom lowering operation amount detected by the boom operation detector is larger than a preset reference operation amount, the capacity of the first hydraulic pump is made smaller than that during the boom independent operation. It is preferable to limit.
- the capacity of the first hydraulic pump increases as the boom lowering operation amount increases.
- the boom cylinder The supply of hydraulic oil to is stopped. Therefore, as in the above-described aspect, when the operation amount for lowering the boom is larger than the reference operation amount, the capacity of the first hydraulic pump is limited to be smaller than that during the single operation of the boom, thereby discharging more than necessary for the boom cylinder. The flow rate of the operating oil can be suppressed. Therefore, energy saving can be achieved.
- the controller has a capacity of the first hydraulic pump based on a combined operation characteristic in which the capacity decreases in accordance with an increase in the operation amount of the boom operation means under the condition that the merging switching valve is switched to the shut-off position.
- the composite operation characteristic is set so that the relationship between the operation amount and the capacity of the boom operation means is reversed with respect to the boom single operation characteristic with the reference operation amount as a boundary. preferable.
- the capacity of the first hydraulic pump can be limited when the boom lowering operation amount is larger than the reference operation amount.
- the capacity is set to be large in a range where the operation amount for lowering the boom is smaller than the reference operation amount, so the boom operating means is slightly lowered from the non-operating state when the arm pressing operation amount is large.
- the boom operating means When operated in the direction, it is possible to suppress a sudden decrease in the capacity of the first hydraulic pump.
- the arm operation detector can detect an operation amount of the arm operation means, and the controller operates the arm operation under a condition that the merging switching valve is switched to a shut-off position. It is preferable to set the capacity of the first hydraulic pump as a capacity that is lower than the capacity based on the arm operating characteristic when the capacity increases according to the operation amount of the means and the capacity based on the combined operating characteristic.
- the operation amount of the arm operating means when the operation amount of the arm operating means is small, the capacity of the first hydraulic pump can be further reduced, so that the energy saving effect can be improved.
- the capacity of the first hydraulic pump may be limited to be small depending on the operation amount of the boom operation means. This is to reproduce the situation in which excess hydraulic oil is supplied from the first hydraulic pump to the boom cylinder as in the conventional case. By doing so, the same operational feeling as in the conventional case is obtained while obtaining an energy saving effect. Can be provided to the operator.
- the present invention is a construction machine, wherein a base machine, a boom attached to the base machine so as to be able to be lifted and lowered by pivoting about a boom foot pin, and a push-pull operation with respect to the boom.
- a construction machine comprising an attached arm and the hydraulic control device for controlling the operation of the boom and the arm.
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Abstract
Description
図1を参照して、第1実施形態に係る建設機械の一例としての油圧ショベル1は、クローラ2aを有する下部走行体2及び地面に対して垂直な軸回りに旋回可能となるように下部走行体2上に設けられた上部旋回体3によって構成されたベースマシンと、上部旋回体3に対して起伏可能に設けられたアタッチメント4と、アタッチメント4の動作を制御するための油圧制御装置5(図2参照)とを備えている。
第1実施形態では、ブーム下げ及びアーム押しの複合操作が検出されたときに合流切換弁25を遮断位置P5に切り換えているが、合流切換弁25を切り換える条件として、さらにブームシリンダ9に要求される負荷を考慮することもできる。
上述のように、前記各実施形態では、合流切換弁25を遮断位置に切り換えることにより、複合操作時においてブームシリンダ9へ余分に作動油が供給されるのを抑制することができる。そのため、以下説明する第3実施形態のように、合流切換弁25が遮断位置に切り換えられる条件下においてポンプ容量を制限することにより、省エネを図ることができる。
第3実施形態における複合操作時特性T3は、ブーム下げ操作量に応じて容量が減少するように設定されているが、複合操作時特性はこれに限定されない。複合操作時特性は、基準操作量Eよりもブーム下げ操作量が大きい範囲でブーム単独操作時特性T1に基づく容量よりも容量が低く設定されていればよい。
Claims (6)
- ベースマシンに対してブームフットピンを中心とする回動による上げ下げ作動可能に取り付けられたブームと、
前記ブームの先端部に対して押し引き作動可能に取り付けられたアームと、
前記ブームを上げ下げ作動させるためのブームシリンダと、
前記アームを押し引き作動させるためのアームシリンダと、
前記両シリンダの油圧源としての第1油圧ポンプ及び第2油圧ポンプと、
前記第1油圧ポンプと前記ブームシリンダとを接続するブームシリンダ回路と、
前記第2油圧ポンプと前記アームシリンダとを接続するアームシリンダ回路と、
前記ブームシリンダ回路に設けられ、前記ブームシリンダに対する作動油の給排を制御するブーム用コントロールバルブと、
前記アームシリンダ回路に設けられ、前記アームシリンダに対する作動油の給排を制御するアーム用コントロールバルブと、
前記ブーム用コントロールバルブを操作するブーム用操作手段と、
前記アーム用コントロールバルブを操作するアーム用操作手段と、
前記ブーム用コントロールバルブよりも上流側の分岐接続点で前記ブームシリンダ回路から分岐した状態で前記ブームシリンダ回路に接続され、前記第1油圧ポンプからの吐出油を前記アームシリンダに合流させる合流回路と、
前記ブーム用操作手段によるブーム下げ操作の有無を検出するブーム操作検出器と、
前記アーム用操作手段によるアーム押し操作の有無を検出するアーム操作検出器と、
前記ブームシリンダ回路における前記合流回路の分岐接続点と前記ブーム用コントロールバルブとの間に設けられているとともに、前記第1油圧ポンプから前記ブーム用コントロールバルブへ作動油を供給可能な供給位置と、作動油の供給を遮断する遮断位置との間で切換可能な合流切換弁と、
タンク内の作動油を前記ブームシリンダのロッド側室に補給する補給弁を有する補給回路と、
前記各操作検出器によりブーム下げとアーム押しとの複合操作が検出された場合に前記合流切換弁を前記遮断位置に切り換える制御器とを備えている、油圧制御装置。 - 前記ブームシリンダのロッド側室内の圧力を検出する圧力検出器をさらに備え、
前記制御器は、前記各操作検出器により前記複合操作が検出され、かつ、前記圧力検出器により検出された圧力が予め設定された基準圧力以下である場合に前記合流切換弁を遮断位置とする一方、前記各操作検出器により前記複合操作が検出され、かつ、前記圧力検出器により検出された圧力が前記基準圧力よりも高い場合に前記合流切換弁を供給位置に切り換える、請求項1に記載の油圧制御装置。 - 前記第1油圧ポンプは、可変容量式の油圧ポンプであり、
前記ブーム操作検出器は、前記ブーム用操作手段の操作量を検出可能であり、
前記制御器は、前記ブーム下げの単独操作時に前記ブーム用操作手段の操作量の増加に応じて容量が増加するブーム単独操作時特性に基づいて前記第1油圧ポンプの容量を制御する一方、前記合流切換弁が遮断位置に切り換えられる条件下において、前記ブーム操作検出器により検出されたブーム下げの操作量が予め設定された基準操作量よりも大きい場合に、前記第1油圧ポンプの容量を前記ブーム単独操作時よりも小さく制限する、請求項1又は2に記載の油圧制御装置。 - 前記制御器は、前記合流切換弁が遮断位置に切り換えられる条件下において、前記ブーム用操作手段の操作量の増加に応じて容量が減少する複合操作時特性に基づいて前記第1油圧ポンプの容量を決定し、
前記複合操作時特性は、前記ブーム用操作手段の操作量と容量との関係が前記基準操作量を境界として前記ブーム単独操作時特性に対し反転するように設定されている、請求項3に記載の油圧制御装置。 - 前記アーム操作検出器は、前記アーム用操作手段の操作量を検出可能であり、
前記制御器は、前記合流切換弁が遮断位置に切り換えられる条件下において、前記アーム用操作手段の操作量の増加に応じて容量が増加するアーム単独操作時特性に基づく容量、及び前記複合操作時特性に基づく容量のうち低い容量を前記第1油圧ポンプの容量として設定する、請求項4に記載の油圧制御装置。 - 建設機械であって、
ベースマシンと、
前記ベースマシンにブームフットピンを中心とする回動により上げ下げ作動可能に取り付けられたブームと、
前記ブームに対して押し引き作動可能に取り付けられたアームと、
前記ブーム及び前記アームの作動を制御する、請求項1~5の何れか1項に記載の油圧制御装置とを備えている、建設機械。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US14/758,010 US10047494B2 (en) | 2012-12-26 | 2013-12-20 | Hydraulic control device and construction machine with same |
| EP13869346.0A EP2940315B1 (en) | 2012-12-26 | 2013-12-20 | Hydraulic control device and construction machine with same |
| KR1020157019223A KR102056959B1 (ko) | 2012-12-26 | 2013-12-20 | 유압 제어 장치 및 이것을 구비한 건설 기계 |
| CN201380068369.XA CN104870831B (zh) | 2012-12-26 | 2013-12-20 | 液压控制装置及具有该液压控制装置的工程机械 |
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| JP2012-282904 | 2012-12-26 | ||
| JP2012282904A JP5978985B2 (ja) | 2012-12-26 | 2012-12-26 | 油圧制御装置及びこれを備えた建設機械 |
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| US (1) | US10047494B2 (ja) |
| EP (1) | EP2940315B1 (ja) |
| JP (1) | JP5978985B2 (ja) |
| KR (1) | KR102056959B1 (ja) |
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| WO2017014324A1 (ja) * | 2016-07-29 | 2017-01-26 | 株式会社小松製作所 | 制御システム、作業機械、及び制御方法 |
| WO2018061165A1 (ja) * | 2016-09-29 | 2018-04-05 | 日立建機株式会社 | 油圧駆動装置 |
| GB2554682B (en) * | 2016-10-03 | 2022-01-19 | Bamford Excavators Ltd | Hydraulic systems for construction machinery |
| GB2554683B (en) * | 2016-10-03 | 2022-01-26 | Bamford Excavators Ltd | Hydraulic systems for construction machinery |
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| JP6450487B1 (ja) * | 2018-05-15 | 2019-01-09 | 川崎重工業株式会社 | 油圧ショベル駆動システム |
| JP7338292B2 (ja) * | 2019-07-19 | 2023-09-05 | コベルコ建機株式会社 | 建設機械の油圧制御装置 |
| CN110566523B (zh) * | 2019-09-12 | 2021-06-15 | 上海华兴数字科技有限公司 | 液压系统和挖掘机 |
| JP7202278B2 (ja) * | 2019-11-07 | 2023-01-11 | 日立建機株式会社 | 建設機械 |
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Also Published As
| Publication number | Publication date |
|---|---|
| KR102056959B1 (ko) | 2020-01-14 |
| JP2014126126A (ja) | 2014-07-07 |
| US10047494B2 (en) | 2018-08-14 |
| EP2940315A1 (en) | 2015-11-04 |
| CN104870831A (zh) | 2015-08-26 |
| KR20150099785A (ko) | 2015-09-01 |
| EP2940315B1 (en) | 2018-02-14 |
| EP2940315A4 (en) | 2016-04-06 |
| CN104870831B (zh) | 2017-05-17 |
| JP5978985B2 (ja) | 2016-08-24 |
| US20150354167A1 (en) | 2015-12-10 |
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