EP2444555B1 - Power shovel - Google Patents
Power shovel Download PDFInfo
- Publication number
- EP2444555B1 EP2444555B1 EP10789245.7A EP10789245A EP2444555B1 EP 2444555 B1 EP2444555 B1 EP 2444555B1 EP 10789245 A EP10789245 A EP 10789245A EP 2444555 B1 EP2444555 B1 EP 2444555B1
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- EP
- European Patent Office
- Prior art keywords
- hydraulic
- hydraulic pump
- pilot pressure
- cylinder
- primary
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000003921 oil Substances 0.000 claims description 106
- 230000007246 mechanism Effects 0.000 claims description 31
- 230000007423 decrease Effects 0.000 claims description 16
- 230000005611 electricity Effects 0.000 claims description 10
- 239000010720 hydraulic oil Substances 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims 2
- 238000010276 construction Methods 0.000 description 16
- 238000009826 distribution Methods 0.000 description 14
- 108010066278 cabin-4 Proteins 0.000 description 11
- 230000009471 action Effects 0.000 description 5
- 230000003247 decreasing effect Effects 0.000 description 5
- 239000012141 concentrate Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000003213 activating effect Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Images
Classifications
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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
- E02F9/2217—Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels
-
- 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
- E02F9/2058—Electric or electro-mechanical or mechanical control devices of vehicle sub-units
- E02F9/2095—Control of electric, electro-mechanical or mechanical equipment not otherwise provided for, e.g. ventilators, electro-driven fans
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/20507—Type of prime mover
- F15B2211/20515—Electric motor
-
- 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
- F15B2211/60—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
- F15B2211/6309—Electronic controllers using input signals representing a pressure the pressure being a pressure source supply pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/63—Electronic controllers
- F15B2211/6303—Electronic controllers using input signals
- F15B2211/6306—Electronic controllers using input signals representing a pressure
- F15B2211/6316—Electronic controllers using input signals representing a pressure the pressure being a 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
- F15B2211/60—Circuit components or control therefor
- F15B2211/665—Methods of control using electronic components
- F15B2211/6651—Control of the prime mover, e.g. control of the output torque or rotational speed
-
- 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
- F15B2211/6652—Control of the pressure source, e.g. control of the swash plate angle
-
- 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
-
- 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
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/88—Control measures for saving energy
Definitions
- the present invention relates to a power shovel configured so as to use hydraulic pressure to actuate an actuator, and further relates to a hydraulic control device for a construction machine in which this hydraulic pressure is supplied from a hydraulic pump driven by an electric motor.
- An electric power shovel is an example of an electric construction machine having a configuration in which a hydraulic pump is activated by an electric motor, and operating oil supplied from the hydraulic pump is used to actuate a hydraulic actuator.
- the hydraulic actuator include a hydraulic motor, a hydraulic cylinder, and the like, and by actuating these hydraulic actuators, the cylinder of a travel device, a revolving device, a boom, an arm, a bucket, or another component is actuated to perform various operations such as traveling and excavating.
- a power shovel is also capable of performing operations such as revolving a vehicle and moving earth.
- the hydraulic actuator In a construction machine such as a power shovel, usually the hydraulic actuator is designed so that it can be actuated at a speed corresponding to the amount an operating device (e.g., an operating lever) is operated.
- the actuated speed of the hydraulic actuator can be variably adjusted, but this is made possible, for example, by using a pilot pressure drive system for the control valve which controls the supply of hydraulic pressure to the hydraulic actuator, and continuously varying the flow rate of operating oil by adjusting the amount of the pilot pressure being supplied.
- a control valve could be a proportional solenoid valve, for example, wherein the flow rate of operating oil to the control valve is continuously varied by varying the electric current being supplied, or it could be a mechanical lever.
- a pilot hydraulic pump for supplying pilot pressure is also required, and a construction machine has been proposed (see Patent Document 1, for example) wherein these hydraulic pumps are driven by electric devices (electric motors).
- This construction machine comprises an electric device for activating a hydraulic pump, electric device control means for controlling the electric device, an operating lever or another operating mechanism, and notification means for electrically notifying that operation of the operating mechanism has stopped.
- the construction machine is configured so that the electric device can be stopped immediately via the notification means when operation of the operating mechanism has been stopped, and is designed so that energy consumption can be minimized during a standby time when operation has been stopped.
- FIG. 11 An example of a conventional hydraulic control device 200 provided to such an electrically driven construction machine is shown in FIG. 11 .
- This hydraulic control device 200 is configured comprising hydraulically driven primary pumps P21, P22 and secondary pumps P23, P24, a hydraulic actuator group 210 configured from a plurality of hydraulic cylinders and hydraulic motors, an operating oil tank 240, a control valve group 250, a power source unit 280, an electric motor M, and other components.
- the hydraulic control device 200 is provided with a pilot valve 260 for supplying pilot pressure to the control valve group 250 via a pilot oil passage 270, the actuating of the control valve group 250 is controlled by this pilot pressure, and the amount of operating oil passing through here and other factors are controlled to supply the oil to the hydraulic actuator group 210.
- EP-A-1 455 439 and JP-A-2000-273 913 both disclose a power shovel according to the preamble portion of claim 1.
- a single electric motor M actuates the traveling of the construction machine, the driving and revolving of the power shovel mechanism, the supply of pilot pressure, and the like. Therefore, there are problems in that it is not possible to set or control factors such as an amount of operating oil suited to the desired drive amount of each hydraulic actuator, operating oil is supplied to the hydraulic pumps needlessly, and the electric motors consume energy needlessly.
- a problem with the electrically driven construction machine disclosed in EP-A-1 455 439 and JP-A-2000-273 913 is that although the amount of electricity used can be reduced, a plurality of inverters are still needed and cost rises. Another problem is that the space occupied by the devices increases, such as the need to ensure new space for installing the devices because the number of devices increases, and the structure becomes complicated.
- an object of the present invention is to provide a hydraulic control device for a construction machine wherein less electric equipment is needed to minimize cost and conserve energy.
- the present invention provides a power shovel of the kind referred to above, in which the primary hydraulic pump comprises a first hydraulic pump of the variable type and a second hydraulic pump of the variable type, both of which are driven by the first electric motor, in which the first primary hydraulic pump is adapted to supply hydraulic oil to the left travel hydraulic motor, the boom cylinder and arm cylinder, the second primary hydraulic pump is adapted to supply hydraulic oil to the right travel-hydraulic motor, the oucket cylinder and the swinging cylinder, the first secondary hydraulic pump is adapted to supply hydraulic oil to the revolution motor and the second secondary hydraulic pump is adapted to supply hydraulic oil to the pilot pressure output means.
- the primary hydraulic pump comprises a first hydraulic pump of the variable type and a second hydraulic pump of the variable type, both of which are driven by the first electric motor
- the first primary hydraulic pump is adapted to supply hydraulic oil to the left travel hydraulic motor, the boom cylinder and arm cylinder
- the second primary hydraulic pump is adapted to supply hydraulic oil to the right travel-hydraulic motor
- the power shovel also comprises a blade connected to the travel device
- the power shovel mechanism also comprises a blade connected to the travel device and capable of swinging up and down
- the secondary actuator group comprises a blade cylinder to swing the blade up and down
- the first secondary hydraulic pump is adapted to supply hydraulic oil to the blade cylinder.
- a crawler-type power shovel 1 is described as an example of the construction machine according to the present invention.
- the power shovel 1 described herein is an electrically driven construction machine which actuates using electricity, and, having the same essential configuration as the conventional example, is configured from a travel device 2 having a pair of left and right crawler travel mechanisms, a revolving mechanism 3 provided to the top of the travel device 2, a driver cabin 4 provided to the top of the revolving mechanism 3 and capable of horizontal revolution, a power shovel mechanism 5 attached to the front of the driver cabin 4 and capable of horizontal revolution, a blade 6 (an earth-moving plate) provided to be free to swing o the rear of the driver cabin 4, and other components.
- the travel device 2 is configured from crawler mechanisms provided to the left and right sides of a travel frame 2d, the crawler mechanisms being composed of drive wheels 2a, driven wheels 2b, and crawler belts 2c wrapped around the drive wheels 2a and driven wheels 2b. These mechanisms are configured so that the drive wheel 2a provided to the right side is driven by a right travel hydraulic motor 7R (see FIG. 2 ), and the drive wheel 2a provided to the left side is driven by a left travel hydraulic motor 7L (see FIG. 2 ).
- the revolving mechanism 3 is provided to the center top part of the travel frame 2d, and the revolving mechanism 3 is designed so that by tilting a revolution operating lever of an operating device 20 described hereinafter, the driving of a revolution motor 8 (see FIG. 2 ) described hereinafter can be controlled to revolvably drive the driver cabin 4.
- a vehicle body frame 9 is provided in the bottom of the driver cabin 4, a hydraulic control device 30, described hereinafter, is mounted in the top of the vehicle body frame 9 and in the rear of the driver cabin 4, and the hydraulic control device 30 is covered by a cover member 13.
- the driver cabin 4 is provided with an operator seat 11 in which the operator can ride and the operating device 20 for operating the various actions of the power shovel 1 as shown in FIG. 1 , and by riding in the operator seat 11 and operating the operating device 20, the operator can operate the actions of the power shovel 1.
- the power shovel mechanism 5 is configured from a boom 15 which is pivotally connected so as to be free to horizontally revolve or swing on a main body pivotally connecting part 14 formed protruding toward the front of the vehicle body frame 9, an arm 16 pivotally connected to the distal end of the boom 15 so as to be capable of swinging up and down in the same vertical plane, and a bucket 17 pivotally connected to the distal end of the arm 16 so as to be capable of swinging up and down in the same vertical plane.
- a swing-side pivotally connected part 18 and a swinging cylinder 18a are provided to the front of the vehicle body frame 9, and the swing-side pivotally connected part 18 can be swung by the reciprocating action of the swinging cylinder 18a.
- a boom cylinder 15a which causes the boom 15 to swing up and down is provided as a connection between the swing-side pivotally connected part 18 and the boom 15, an arm cylinder 16a which causes the arm 16 to swing up and down is provided as a connection between the boom 15 and the arm 16, and a bucket cylinder 17a and link 17b which cause the bucket 17 to swing up and down are provided as a connection between the arm 16 and the bucket 17.
- the blade 6 is designed so that it can be swung by the reciprocating action of a blade cylinder 6a.
- the power shovel 1 also comprises a quick hitch mechanism (not shown) for disengaging a chip breaker, an auger device, and other various attachments at the distal end of the arm 16; and a quick hitch cylinder 90 (see FIG. 2 ) described hereinafter for actuating the attachments engaged by the quick hitch mechanism.
- the supplied amount and supply direction of operating oil supplied to the quick hitch cylinder 90 can be controlled and the actuating of the attachments attached to the quick hitch mechanism can be controlled by the hydraulic control device 30 described hereinafter.
- the hydraulic actuators described above are actuated by the supply of operating oil (oil pressure), and the hydraulic control device 30 (see FIG. 2 ) controls the amount and direction of operating oil supplied to the hydraulic actuators in accordance with the operation of the operating device 20 by the operator, thereby causing the power shovel 1 to travel, the power shovel mechanism 5 to actuate, the driver cabin 4 to revolve, etc.; and enabling traveling, excavating, revolving, and other operations.
- the operating device 20 is configured from a travel operation lever for operating the travel of the power shovel 1, a revolving operation lever for operating the revolution of the driver cabin 4, a boom operation lever for performing operations of the boom, arm, bucket, and other components, an arm operation lever, a bucket operation lever, and the like.
- the operations performed by the power shovel 1 described above are mostly excavating (the actuating of the power shovel mechanism 5) and traveling (these are referred to as the main operations hereinbelow).
- Operations such as the revolving of the driver cabin 4 and the reciprocating of the blade 6 (hereinbelow referred to as the sub-operations) are supplementary to the main operations, and are therefore used less frequently than the main operations.
- eight tenths of the total operating oil being supplied to the hydraulic actuators is supplied for the actuating of the boom, arm, and bucket, i.e. for excavating (actuating the power shovel mechanism 5), while the other two tenths is supplied for traveling, revolving the driver cabin 4, and the like.
- excavating actuating the power shovel mechanism 5
- the other operations require only a small amount of operating oil in comparison with actuating the power shovel mechanism 5.
- the conventional hydraulic control device is configured from a control valve for controlling factors such as the amount of operating oil supplied to the hydraulic actuators, a hydraulic pump for discharging operating oil, an electric motor for activating the hydraulic pump, an operating oil tank for storing operating oil, and other components, but the conventional hydraulic control device is often provided with only one electric motor.
- a problem occurs in that the electric motor is driven at the same drive rate as operations requiring a large amount of operating oil even when performing operations that do not require a large amount of operating oil, operating oil is repeatedly supplied and relieved needlessly, and energy is consumed needlessly.
- the travel motors 7L, 7R, the boom cylinder 15a, the arm cylinder 16a, the bucket cylinder 17a, and the swinging cylinder 18a for performing the main operations such as traveling and excavating are designated as the primary actuator group
- the revolution motor 8 and the blade cylinder 6a for performing the sub-operations are designated as the secondary actuator group
- different electric motors and hydraulic pumps are used for the primary actuator group and the secondary actuator group.
- the operating oil supplied to the primary actuator group is supplied by the first and second hydraulic pumps P1, P2 (hereinbelow referred to as the primary pumps P1, P2), and the primary pumps P1, P2 are driven by a first electric motor M1, as shown in FIG. 2 .
- the operating oil supplied to the secondary actuator group and a hereinafter-described pilot oil passage 70 is supplied by the third and fourth hydraulic pumps P3, P4 (hereinbelow referred to as the secondary pumps P3, P4, and the secondary pumps P3, P4 are driven by a second electric motor M2.
- the first and second electric motors M1, M2 receive AC voltage from a power source unit 80 configured from a battery and an inverter, whereby the motors are driven.
- the power shovel 1 in the present embodiment uses a so-called manual system (link system), and when the power shovel 1 is traveling, revolving and other actions are not performed, nor are the secondary pumps P3, P4 activated. Therefore, traveling is categorized as a main operation and the driving thereof is achieved by the supply of operating oil from the primary pumps P1, P2.
- a total of two electric motors are provided, one for the supply of operating oil to the primary actuator group and one for the supply of operating oil to the secondary actuator group, thereby making it possible to reduce the amount of operating oil supplied during the sub-operations (revolving and blade reciprocating) which do not require a large amount of operating oil, and also to prevent needless energy consumption.
- the hydraulic control device 30 is configured comprising a primary control valve group 50, a secondary control valve group 60, the above-described primary pumps P1, P2 and secondary pumps P3, P4, the first and second electric motors M1, M2, and an operating oil tank 40, as shown in FIG. 2 .
- the primary control valve group 50 is configured from left and right travel control valves 52, 53, a boom control valve 55, an arm control valve 56, a bucket control valve 57, a swing control valve 58, and a quick hitch control valve 59 which respectively control the operating oil supplied to the travel motors 7L, 7R, the boom cylinder 15a, the arm cylinder 16a, the bucket cylinder 17a, the swinging cylinder 18a, and the quick hitch cylinder 90.
- the secondary control valve group 60 is configured comprising a blade control valve 66 and a revolving control valve 68 for controlling the operating oil supplied to the blade cylinder 6a and the revolution motor 8.
- the boom control valve 55, the arm control valve 56, the bucket control valve 57, and the revolving control valve 68 are each configured comprising a spool, and are also configured so that the spools move according to the pilot pressure of the operating oil supplied through a remote control valve group 75 (described in detail hereinafter) and a pilot valve 72 (described in detail hereinafter), which are opened and closed by the secondary pump P4 according to the amount the operating device 20 is operated.
- the operating oil is supplied from the pilot valve 72 through the pilot oil passage 70 to the boom control valve 55, the arm control valve 56, the bucket control valve 57, and the revolving control valve 68, and the supply of operating oil to the boom cylinder 15a, the arm cylinder 16a, the bucket cylinder 17a, and the revolution motor 8 can be controlled by the movement of the spools.
- the pilot oil passage 70 is also provided with a relief valve 71, an accumulator 73, a pressure sensor 74, and other components.
- the relief valve 71 is a valve for relieving the operating oil tank 40 of operating oil when the pilot pressure has risen above a predetermined set value, and is provided between the pilot valve 72 and the operating oil tank 40.
- This pilot pressure is detected by the pressure sensor 74 which is provided between the pilot valve 72 and the remote control valve group 75, and the detected pilot pressure is transmitted to a control device 90.
- the control device 90 is designed to be capable of controlling the activation (rotational speed) of the secondary pumps P3, P4 on the basis of the detected value.
- the remote control valve group 75 is configured from a revolution motor remote control valve 76, a boom cylinder actuation remote control valve, an arm cylinder actuation remote control valve, and a bucket cylinder actuation remote control valve, which are driven respectively by a revolving operation lever, a boom operation lever, an arm operation lever, and a bucket operation lever. Since the revolution motor remote control valve 76, the boom cylinder actuation remote control valve, the arm cylinder actuation remote control valve, and the bucket cylinder actuation remote control valve all have the same configuration, only the revolution motor remote control valve 76 is described hereinbelow, and only the revolution motor remote control valve 76 is shown in FIG. 2 .
- the revolution motor remote control valve 76 has a P port (a pump port) 76p, a T port (a tank port) 76t, and an A port 76a; and the secondary pump P4 is connected to the P port 76p, the operating oil tank 40 is connected to the T port 76t, and the pilot valve 72 is connected to the A port 76a.
- the P port 76p is usually blocked, but when the revolving operation lever is operated, the P port 76p is communicated with the A port 76a, operating oil from the secondary pump P4 is supplied to the pilot oil passage 70, and the pilot pressure (remote control pressure) thereof is outputted to the revolving control valve 68 via the pilot oil passage 70.
- the accumulator 73 is provided as being connected to the pilot valve 72, and is capable of storing up the operating oil discharged from the secondary pump P4.
- the accumulator 73 is capable of releasing the stored up operating oil to the pilot oil passage 70, and oil pressure can be maintained by this storing up and releasing of operating oil. Since the power shovel 1 uses a manual system (a link system) as described above, providing this accumulator 73 makes it possible to temporarily completely stop the secondary pump P4 supplying the pilot pressure while the power shovel 1 is traveling. Specifically, even when the secondary pump P4 is stopped, the pilot pressure can be supplied from the pilot valve 72 to the hydraulic actuators (described in detail hereinafter) by the release of operating oil from the accumulator 73.
- FIGS. 3A and B show the respective torque frequency distributions in a case in which the primary pumps P1, P2 and the secondary pumps P3, P4 are activated using only one electric motor M, and a case in which the first and second electric motors M1, M2 are used, wherein the primary pumps P1, P2 are activated by the first electric motor M1 and the secondary pumps P3, P4 are activated by the second electric motor M2.
- FIG. 3A shows the torque frequency distribution of the first electric motor M1
- FIG. 3B shows the torque frequency distribution of the second electric motor M2.
- the torque frequency distribution remains substantially uniform between 0 and 50 (Nm).
- the actuator connected to the first electric motor M1 is different from the actuator connected to the second electric motor M2, and the torque frequency distributions of the first electric motor M1 and the second electric motor M2 therefore concentrate at different values. Therefore, the electric motors can be efficiently utilized by selecting motors with similar frequency distributions and torque characteristics as the first and second electric motors M1, M2. For example, in a case in which the torque frequency distribution of the first electric motor M1 concentrates at 25 Nm as shown in FIG. 3A , the energy of the electric motor can be efficiently utilized by selecting a motor 102 having characteristics such that the torque frequency distribution concentrates at 25 Nm as shown in FIG. 3C as the first electric motor M1.
- FIG. 4 is referenced to describe the relationship between the pilot pressure when the power shovel 1 is traveling and the rotational speed of the secondary pump P4 whose maximum rotational speed is 3800 rpm, for example, in the hydraulic control device 30.
- the pilot pressure at time 0 is 3.5 MPa, and the accumulation of pressure in the accumulator 73 is complete at this time.
- the excavating operation can be continued by the pilot pressure of the operating oil because the operating oil whose pressure has accumulated in the accumulator 73 is released.
- the pilot pressure begins to gradually decrease, and when the control device 90 has detected that the pilot pressure has decreased to 1.0 MPa, for example, the control device 90 activates the secondary pump P4 at approximately 1000 rpm, far lower than the maximum rotational speed. After the secondary pump P4 has been activated, the pilot pressure begins to rise and the accumulator 73 again begins to accumulate pressure. The control device 90 then again stops the secondary pump P4 upon detecting that the pilot pressure has risen to 3.5 MPa, for example.
- pilot pressure upper limit (3.5 MPa) and lower limit (1.0 MPa) and the rotational speed (1000 rpm) of the secondary pump P4 are not limited to the aforementioned values and can be varied as desired.
- the hydraulic control device in the embodiment described above is provided with a total of two electric motors, one for the primary actuator group and one for the secondary actuator group, whereby the supply of needless energy by the electric motors can be reduced.
- Providing the accumulator 73 makes it possible to reduce or temporarily stop the rotational speed of the secondary pump P4, and an energy conservation effect can be achieved.
- the present invention should not be interpreted as being limited to the embodiment described above, and suitable improvements can be made within a range that does not deviate from the scope of the present invention.
- the accumulator 73 was provided and the rotational speed of the secondary pump P4 was reduced or temporarily stopped, but the rotational speeds of the primary pumps P1, P2 can also be reduced or temporarily stopped by providing the same accumulators to the oil passages for operating oil supplied from the primary pumps P1, P2.
- the first and second electric motors M1, M2 were provided respectively to the primary pumps P1, P2 and the secondary pumps P3, P4, thereby allowing different torque frequency distributions to be obtained and the energy of the electric motors to be efficiently utilized, but the method of disposing electric motors is not limited to this example, and electric motors may also be provided respectively to the first hydraulic pump P1 and the second hydraulic pump P2, for example. Different torque frequency distributions can be obtained and the energy of the electric motors can be more efficiently utilized even when the electric motors are provided in this manner.
- a crawler-type power shovel 1 having the same configuration as described above is used as the construction machine according to the present invention.
- Structural components identical to those of the power shovel 1 are denoted by the same numbers and are not described.
- This embodiment has a description of the primary actuator group for performing the above-described main operations (the left and right travel motors 7L, 7R, the boom cylinder 15a, the arm cylinder 16a, the bucket cylinder 17a, and the swinging cylinder 18a), and the configuration for controlling the supply of operating oil (oil pressure) to the main operation actuator group.
- a hydraulic control device 110 is provided for performing operating oil supply control for the main operation actuator group.
- This hydraulic control device 110 is configured as shown in FIG. 5 , and the amount and direction of operating oil supplied to the hydraulic actuators are controlled according to the operation of the operating device 20 by the operator, thereby enabling traveling, excavating, and other operations of the power shovel 1.
- the hydraulic control device 110 is configured comprising first and second control valve groups 120, 130, first and second hydraulic pumps P1, P2, an electric motor M, an inverter 136, a volumetric cylinder 137, first and second pressure sensors 138, 139, an operating oil tank 140, a controller 150, a battery 160, and other components, as shown in FIG. 5 .
- the first control valve group 120 is configured comprising a left travel control valve 121, a boom travel control valve 122, and a bucket control valve 132 for performing controls such as the amount of operating oil supplied to the left travel motor 7L, the boom cylinder 15a, and the bucket cylinder 17a, respectively.
- the second control valve group 130 is configured comprising a right travel control valve 131, an arm control valve 123, and a swing control valve 133 for performing controls such as the amount of operating oil supplied to the right travel motor 7R, the arm cylinder 16a, and the swinging cylinder 18a, respectively.
- the boom travel control valve 122, the arm control valve 123, and the bucket control valve 132 each house a spool, and the spools can be moved by pilot pressure supplied from a pilot valve (not shown). Factors such as the amount of operating oil supplied to the boom cylinder 15a, the arm cylinder 16a, and the bucket cylinder 17a can be controlled by this spool movement.
- the first and second hydraulic pumps P1, P2 are provided in order to perform the traveling and excavating of the power shovel 1 (the actuating of the power shovel mechanism 5), connected with the output shaft (not shown) of the electric motor M, and configured so as to both discharge operating oil obtained from the operating oil tank 140 along with the driving of the electric motor M.
- the first and second hydraulic pumps P1, P2 are so-called swash plate piston pumps having swash plates (not shown), wherein the angles of the swash plates can be varied.
- the amount of operating oil discharged (discharge amount) can be varied by varying these angles.
- the discharge volume is not controlled (feedback control) based on the pressure of the discharged operating oil (the detected values of the first and second pressure sensors 138, 139 described hereinafter). Therefore, the discharge volumes of the first and second hydraulic pumps P1, P2 do not fluctuate even if the load torque of the electric motor M increases and the discharge pressure fluctuates, as shown in FIG. 6 .
- the electric motor M is driven by a supply of AC electricity which has a predetermined voltage and frequency and which has been converted via the inverter 136 from DC electricity supplied from the battery 160 described hereinafter.
- the first and second pressure sensors 138, 139 are provided so as to be connected to the oil passages of the operating oil supplied from the first and second hydraulic pumps P1, P2 respectively, and the first pressure sensor 138 detects the pressure of operating oil discharged from the first hydraulic pump P1, while the second pressure sensor 139 detects the pressure of operating oil discharged from the second hydraulic pump P2.
- the oil pressures detected by the first and second pressure sensors 138, 139 are both outputted to the controller 150.
- the controller 150 is capable of detecting the remaining battery power from the value of the electric current supplied from the battery 160 described hereinafter, and the controller 150 outputs a volume variation signal to the volumetric cylinder 137 in accordance with the detected remaining battery power.
- the volumetric cylinder 137 is configured to be free to reciprocate, and is designed so as to reciprocate according to the volume variation signal.
- the angles of the swash plates of the first and second hydraulic pumps P1, P2 can be varied according to this reciprocation, and the volumetric cylinder 137 can vary the maximum volumes of the first and second hydraulic pumps P1, P2 by varying the angles of the swash plates.
- the battery 160 is provided in order to supply DC electricity to the inverter 136 and the controller 150, and the maximum value of the battery's output electric current is 30 A in this embodiment.
- the pressure of the operating oil discharged from the first and second hydraulic pumps P1, P2 increases in proportion to this output electric current.
- Both the relationship between the size of the electric current supplied from the battery 160 and the pressure (oil pressure) of the operating oil discharged from the first and second hydraulic pumps P1, P2, and the relationship between the rotational speed of the electric motor M and the oil pressure, are such that when the load torque of the electric motor M increases, the rotational speed of the electric motor M is maintained at a constant value as shown in FIGS. 7A and B , and the oil pressure and electric current supplied from the battery 160 therefore increase as well.
- the load torque reaches a certain constant value or greater, the electric current reaches an upper limit of 30 A and does not increase any further, and the rotational speed of the electric motor M decreases.
- the output of the electric motor M is 7 kW in the present embodiment
- the operating device 20 is configured from a travel operating lever for operating the travel of the power shovel 1; and a boom operating lever, an arm operating lever, a bucket operating lever, and the like for operating a boom, an arm, a bucket, and other components.
- the operating device 20 is provided with an energy-saving mode switch 20a, the energy-saving mode switch 20a is capable of being turned on and off, and the energy-saving mode switch 20a can switch to an energy-saving mode when turned on and switched to a normal mode when turned off.
- the controller 150 performs a control for reducing the maximum volume of the first and second hydraulic pumps P1, P2 in accordance with the decrease in remaining battery power of the battery 160.
- the controller 150 is not made to reduce the maximum volume of the first and second hydraulic pumps P1, P2, and the controller 150 can be made to actuate the hydraulic actuators quickly.
- the controller 150 by providing energy-saving mode and making the controller 150 perform control so that the maximum volume of the first and second hydraulic pumps P1, P2 is reduced according to the decrease in the remaining battery power, the electricity consumed by the battery 160 is minimized and the active time duration can be extended.
- the operating speed also decreases when energy-saving mode is activated and the volume of the first and second hydraulic pumps P1, P2 is reduced, but it is also possible to not lower oil pressure (power), and the operator can be made aware from this speed decrease that the remaining battery power has decreased.
- the controller 150 detects that the remaining battery power has decreased to 50%, the controller outputs a volume variation signal to the volumetric cylinder 137, and the volumetric cylinder 137 varies the angles of the swash plates of the first and second hydraulic pumps P1, P2 to reduce the maximum volume. At this time, the speeds of the hydraulic actuators decrease, and the operator can perceive that the remaining battery power is low.
- the maximum volume is designed to decrease to 3.0 cc/rev when the remaining battery power reaches 0%.
- the hydraulic control device 110 in the above-described embodiment is capable of reducing the maximum volume of the first and second hydraulic pumps P1, P2 in accordance with the decrease in the remaining battery power, the active time duration of the battery 160 can be extended.
- the electric current output from the battery 160 can be reduced in comparison with normal mode in which the maximum volume is not varied, as shown in FIG. 7A .
- the first and second pressure sensors 138, 139 detect the pressures of operating oil discharged from the first and second hydraulic pumps P1, P2 respectively, the detected values are output to the controller 150, and the controller 150 outputs a volume variation signal to the volumetric cylinder 137 to vary the volume of the first and second hydraulic pumps P1, P2, but the configurations of the controller and volumetric cylinder are not limited to this example.
- signal conversion means for converting electric signals to oil pressure signals, such as a proportional valve, must be provided between the controller 150 and the volumetric cylinder 137.
- this type of configuration may be modified and an ON-OFF valve 145, which communicates with the oil passages of operating oil discharged from the first and second hydraulic pumps P1, P2, may be provided between the oil passages and the volumetric cylinder 137 as shown in FIG. 9A .
- the first and second pressure sensors 138, 139 can be omitted, the ON-OFF valve 145 and the controller 150 can be less expensive models than the proportional valve and the controller described above, and the overall cost of the hydraulic control device can therefore be lowered.
- the volumetric cylinder 137 in the configuration shown in FIG. 9A can have a spring or another elastic member attached, and the relationship between discharge volume and pressure of the first and second hydraulic pumps P1, P2 in the case of no elastic member is shown in FIG. 9B , while the relationship in the case of the elastic member is shown in FIG. 9C .
- the first and second hydraulic pumps P1, P2 are configured to vary their volumes based on their own pressures, and the discharge volume in energy-saving mode (refer to the dashed line in FIG. 9B ) is therefore the same as the discharge volume during normal mode (refer to the solid line in FIG.
- the discharge volume in energy-saving mode (refer to the dashed line in FIG. 9C ) is the same as the discharge volume during normal mode (refer to the solid line in FIG. 9C ) even if the discharge pressure is increased to a certain extent from 0, but the pressure gradually decreases upon reaching a predetermined value or greater.
- This predetermined value can be varied by using an elastic member of a different elastic force as the elastic member of the volumetric cylinder 137.
- cost can be lowered, and the relationship between the discharge volume and discharge pressure of the pumps can be varied as shown in FIGS. 9B and C , for example, by attaching and detaching the elastic member to and from the volumetric cylinder 137 and by varying the elastic force of the elastic member.
- the discharge volume can be reduced incrementally according to the increase in discharge pressure, and so-called two-stage control can be performed in which the discharge pressure is varied in two stages.
- the present invention should not be interpreted to be limited to the above embodiments, and suitable improvements can be made within a range that does not deviate from the scope of the present invention.
- an example was described in which two hydraulic pumps were provided, but the number of hydraulic pumps is not limited to two, and the present invention can still be applied even if one, three, or more pumps are provided.
- the output of the electric motor M 7.0 kW
- the maximum volumes of the first and second hydraulic pumps P1, P2 (4.5 cc/rev and 3.0 cc/rev)
- the maximum output electric current of the battery 160 (30 A) are not limited to these values and can be varied as desired.
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Description
- The present invention relates to a power shovel configured so as to use hydraulic pressure to actuate an actuator, and further relates to a hydraulic control device for a construction machine in which this hydraulic pressure is supplied from a hydraulic pump driven by an electric motor.
- An electric power shovel is an example of an electric construction machine having a configuration in which a hydraulic pump is activated by an electric motor, and operating oil supplied from the hydraulic pump is used to actuate a hydraulic actuator. Possible examples of the hydraulic actuator include a hydraulic motor, a hydraulic cylinder, and the like, and by actuating these hydraulic actuators, the cylinder of a travel device, a revolving device, a boom, an arm, a bucket, or another component is actuated to perform various operations such as traveling and excavating. In addition to traveling and excavating, a power shovel is also capable of performing operations such as revolving a vehicle and moving earth.
- In a construction machine such as a power shovel, usually the hydraulic actuator is designed so that it can be actuated at a speed corresponding to the amount an operating device (e.g., an operating lever) is operated. Specifically, the actuated speed of the hydraulic actuator can be variably adjusted, but this is made possible, for example, by using a pilot pressure drive system for the control valve which controls the supply of hydraulic pressure to the hydraulic actuator, and continuously varying the flow rate of operating oil by adjusting the amount of the pilot pressure being supplied. Such a control valve could be a proportional solenoid valve, for example, wherein the flow rate of operating oil to the control valve is continuously varied by varying the electric current being supplied, or it could be a mechanical lever.
- In a construction machine that uses a pilot pressure drive system as described above, in addition to the hydraulic pump for supplying operating oil to the hydraulic actuator, a pilot hydraulic pump for supplying pilot pressure is also required, and a construction machine has been proposed (see
Patent Document 1, for example) wherein these hydraulic pumps are driven by electric devices (electric motors). This construction machine comprises an electric device for activating a hydraulic pump, electric device control means for controlling the electric device, an operating lever or another operating mechanism, and notification means for electrically notifying that operation of the operating mechanism has stopped. The construction machine is configured so that the electric device can be stopped immediately via the notification means when operation of the operating mechanism has been stopped, and is designed so that energy consumption can be minimized during a standby time when operation has been stopped. - An example of a conventional
hydraulic control device 200 provided to such an electrically driven construction machine is shown inFIG. 11 . Thishydraulic control device 200 is configured comprising hydraulically driven primary pumps P21, P22 and secondary pumps P23, P24, ahydraulic actuator group 210 configured from a plurality of hydraulic cylinders and hydraulic motors, anoperating oil tank 240, acontrol valve group 250, apower source unit 280, an electric motor M, and other components. Furthermore, thehydraulic control device 200 is provided with apilot valve 260 for supplying pilot pressure to thecontrol valve group 250 via apilot oil passage 270, the actuating of thecontrol valve group 250 is controlled by this pilot pressure, and the amount of operating oil passing through here and other factors are controlled to supply the oil to thehydraulic actuator group 210. -
EP-A-1 455 439 andJP-A-2000-273 913 claim 1. - In the conventional hydraulic control device configured as shown in
FIG. 11 , a single electric motor M actuates the traveling of the construction machine, the driving and revolving of the power shovel mechanism, the supply of pilot pressure, and the like. Therefore, there are problems in that it is not possible to set or control factors such as an amount of operating oil suited to the desired drive amount of each hydraulic actuator, operating oil is supplied to the hydraulic pumps needlessly, and the electric motors consume energy needlessly. - A problem with the electrically driven construction machine disclosed in
EP-A-1 455 439 andJP-A-2000-273 913 - Because of such problems, an object of the present invention is to provide a hydraulic control device for a construction machine wherein less electric equipment is needed to minimize cost and conserve energy.
- To resolve the problems described above, the present invention provides a power shovel of the kind referred to above, in which the primary hydraulic pump comprises a first hydraulic pump of the variable type and a second hydraulic pump of the variable type, both of which are driven by the first electric motor, in which the first primary hydraulic pump is adapted to supply hydraulic oil to the left travel hydraulic motor, the boom cylinder and arm cylinder, the second primary hydraulic pump is adapted to supply hydraulic oil to the right travel-hydraulic motor, the oucket cylinder and the swinging cylinder, the first secondary hydraulic pump is adapted to supply hydraulic oil to the revolution motor and the second secondary hydraulic pump is adapted to supply hydraulic oil to the pilot pressure output means.
- In case the power shovel also comprises a blade connected to the travel device, the power shovel mechanism also comprises a blade connected to the travel device and capable of swinging up and down, that the secondary actuator group comprises a blade cylinder to swing the blade up and down, and that the first secondary hydraulic pump is adapted to supply hydraulic oil to the blade cylinder.
- Attractive embodiments appear from the dependent claims.
-
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FIG. 1 is a side view of a power shovel showing an example of a construction machine in which the hydraulic control device according to the present invention is applied; -
FIG. 2 is a hydraulic circuit, which does not form part of the claimed invention, J Z showing a hydraulic control device for performing actuating control of a hydraulic actuator of the power shovel; -
FIG. 3 shows graphs comparing cases in which two electric motors are used and one electric motor is used in the hydraulic control device, whereinFIGS. 3A and 3B show the frequency distribution of torque in a case in which four hydraulic pumps are activated by one electric motor and a case in which two hydraulic pumps are activated (two primary pumps inFIG. 3A and two secondary pumps inFIG. 3B), and FIG. 3C is a graph showing the torque characteristics of two electric motors; -
FIG. 4 contains graphs showing the relationship between pilot pressure and secondary pump rotational speed in the hydraulic control device; -
FIG. 5 is a hydraulic circuit showing a second hydraulic control device according to the invention; -
FIG. 6 is a graph showing the P-Q characteristics of the hydraulic pumps before and after the maximum volume of the hydraulic pumps is reduced in the second hydraulic control device; -
FIG. 7 contains views showing the relationship between the oil pressure and the electric current outputted by the battery and the relationship between the oil pressure and the rotational speed of the electric motor in the hydraulic control device, whereinFIG. 7A is a graph showing the relationship between oil pressure and electric current in normal mode or energy-saving mode andFIG. 7B is a graph showing the relationship between oil pressure and the rotational speed of the electric motor; -
FIG. 8A and FIG.8B contain graphs showing the relationship between the volume (discharge volume) of the hydraulic pumps and the remaining battery power in the hydraulic control device; -
FIG. 9A is a view of the hydraulic control device showing a modification of the configuration of the controller and volumetric cylinder periphery,FIG. 9B is a graph showing the relationship between discharge volume and discharge pressure in the case of no elastic member in the volumetric cylinder in this modification,FIG. 9C is a graph showing the relationship between discharge volume and discharge pressure in the case of an elastic member in the volumetric cylinder in this modification; -
FIG. 10A and FIG.10B contain graphs showing the variations in voltage and electric current caused by varying the pump pressure as well as their relationship with time, whereinFIG. 10A is a graph of a case in which a fixed volume hydraulic pump is used andFIG. 10B is a graph of a case in which a variable volume hydraulic pump is used; and -
FIG. 11 is a hydraulic circuit diagram showing an example of a conventional hydraulic control device. - Preferred embodiments of the present invention are described hereinbelow with reference to
FIG. 1 . A crawler-type power shovel 1 is described as an example of the construction machine according to the present invention. Thepower shovel 1 described herein is an electrically driven construction machine which actuates using electricity, and, having the same essential configuration as the conventional example, is configured from atravel device 2 having a pair of left and right crawler travel mechanisms, arevolving mechanism 3 provided to the top of thetravel device 2, adriver cabin 4 provided to the top of therevolving mechanism 3 and capable of horizontal revolution, apower shovel mechanism 5 attached to the front of thedriver cabin 4 and capable of horizontal revolution, a blade 6 (an earth-moving plate) provided to be free to swing o the rear of thedriver cabin 4, and other components. - The
travel device 2 is configured from crawler mechanisms provided to the left and right sides of atravel frame 2d, the crawler mechanisms being composed ofdrive wheels 2a, drivenwheels 2b, andcrawler belts 2c wrapped around thedrive wheels 2a and drivenwheels 2b. These mechanisms are configured so that thedrive wheel 2a provided to the right side is driven by a right travelhydraulic motor 7R (seeFIG. 2 ), and thedrive wheel 2a provided to the left side is driven by a left travelhydraulic motor 7L (seeFIG. 2 ). Therevolving mechanism 3 is provided to the center top part of thetravel frame 2d, and therevolving mechanism 3 is designed so that by tilting a revolution operating lever of anoperating device 20 described hereinafter, the driving of a revolution motor 8 (seeFIG. 2 ) described hereinafter can be controlled to revolvably drive thedriver cabin 4. - A vehicle body frame 9 is provided in the bottom of the
driver cabin 4, ahydraulic control device 30, described hereinafter, is mounted in the top of the vehicle body frame 9 and in the rear of thedriver cabin 4, and thehydraulic control device 30 is covered by acover member 13. Thedriver cabin 4 is provided with anoperator seat 11 in which the operator can ride and theoperating device 20 for operating the various actions of thepower shovel 1 as shown inFIG. 1 , and by riding in theoperator seat 11 and operating theoperating device 20, the operator can operate the actions of thepower shovel 1. - The
power shovel mechanism 5 is configured from aboom 15 which is pivotally connected so as to be free to horizontally revolve or swing on a main body pivotally connectingpart 14 formed protruding toward the front of the vehicle body frame 9, anarm 16 pivotally connected to the distal end of theboom 15 so as to be capable of swinging up and down in the same vertical plane, and abucket 17 pivotally connected to the distal end of thearm 16 so as to be capable of swinging up and down in the same vertical plane. A swing-side pivotally connectedpart 18 and a swingingcylinder 18a are provided to the front of the vehicle body frame 9, and the swing-side pivotally connectedpart 18 can be swung by the reciprocating action of the swingingcylinder 18a. Aboom cylinder 15a which causes theboom 15 to swing up and down is provided as a connection between the swing-side pivotally connectedpart 18 and theboom 15, anarm cylinder 16a which causes thearm 16 to swing up and down is provided as a connection between theboom 15 and thearm 16, and abucket cylinder 17a andlink 17b which cause thebucket 17 to swing up and down are provided as a connection between thearm 16 and thebucket 17. Theblade 6 is designed so that it can be swung by the reciprocating action of ablade cylinder 6a. - The
power shovel 1 also comprises a quick hitch mechanism (not shown) for disengaging a chip breaker, an auger device, and other various attachments at the distal end of thearm 16; and a quick hitch cylinder 90 (seeFIG. 2 ) described hereinafter for actuating the attachments engaged by the quick hitch mechanism. The supplied amount and supply direction of operating oil supplied to thequick hitch cylinder 90 can be controlled and the actuating of the attachments attached to the quick hitch mechanism can be controlled by thehydraulic control device 30 described hereinafter. - The hydraulic actuators described above (the left and right travel
hydraulic motors boom cylinder 15a, thearm cylinder 16a, thebucket cylinder 17a, the swingingcylinder 18a, theblade cylinder 6a, therevolution motor 8, the quick hitch cylinder 90) are actuated by the supply of operating oil (oil pressure), and the hydraulic control device 30 (seeFIG. 2 ) controls the amount and direction of operating oil supplied to the hydraulic actuators in accordance with the operation of theoperating device 20 by the operator, thereby causing thepower shovel 1 to travel, thepower shovel mechanism 5 to actuate, thedriver cabin 4 to revolve, etc.; and enabling traveling, excavating, revolving, and other operations. Theoperating device 20 is configured from a travel operation lever for operating the travel of thepower shovel 1, a revolving operation lever for operating the revolution of thedriver cabin 4, a boom operation lever for performing operations of the boom, arm, bucket, and other components, an arm operation lever, a bucket operation lever, and the like. - The operations performed by the
power shovel 1 described above are mostly excavating (the actuating of the power shovel mechanism 5) and traveling (these are referred to as the main operations hereinbelow). Operations such as the revolving of thedriver cabin 4 and the reciprocating of the blade 6 (hereinbelow referred to as the sub-operations) are supplementary to the main operations, and are therefore used less frequently than the main operations. Specifically, when these operations are performed, eight tenths of the total operating oil being supplied to the hydraulic actuators is supplied for the actuating of the boom, arm, and bucket, i.e. for excavating (actuating the power shovel mechanism 5), while the other two tenths is supplied for traveling, revolving thedriver cabin 4, and the like. Thus, while excavating (actuating the power shovel mechanism 5) requires a large amount of operating oil, the other operations require only a small amount of operating oil in comparison with actuating thepower shovel mechanism 5. - The conventional hydraulic control device is configured from a control valve for controlling factors such as the amount of operating oil supplied to the hydraulic actuators, a hydraulic pump for discharging operating oil, an electric motor for activating the hydraulic pump, an operating oil tank for storing operating oil, and other components, but the conventional hydraulic control device is often provided with only one electric motor. In such a hydraulic control device, since the actuating of all of the hydraulic actuators is performed by one electric motor, a problem occurs in that the electric motor is driven at the same drive rate as operations requiring a large amount of operating oil even when performing operations that do not require a large amount of operating oil, operating oil is repeatedly supplied and relieved needlessly, and energy is consumed needlessly.
- In view of this, in the present embodiment, the
travel motors boom cylinder 15a, thearm cylinder 16a, thebucket cylinder 17a, and the swingingcylinder 18a for performing the main operations such as traveling and excavating are designated as the primary actuator group, therevolution motor 8 and theblade cylinder 6a for performing the sub-operations are designated as the secondary actuator group, and different electric motors and hydraulic pumps are used for the primary actuator group and the secondary actuator group. Specifically, the operating oil supplied to the primary actuator group is supplied by the first and second hydraulic pumps P1, P2 (hereinbelow referred to as the primary pumps P1, P2), and the primary pumps P1, P2 are driven by a first electric motor M1, as shown inFIG. 2 . The operating oil supplied to the secondary actuator group and a hereinafter-describedpilot oil passage 70 is supplied by the third and fourth hydraulic pumps P3, P4 (hereinbelow referred to as the secondary pumps P3, P4, and the secondary pumps P3, P4 are driven by a second electric motor M2. The first and second electric motors M1, M2 receive AC voltage from apower source unit 80 configured from a battery and an inverter, whereby the motors are driven. Thepower shovel 1 in the present embodiment uses a so-called manual system (link system), and when thepower shovel 1 is traveling, revolving and other actions are not performed, nor are the secondary pumps P3, P4 activated. Therefore, traveling is categorized as a main operation and the driving thereof is achieved by the supply of operating oil from the primary pumps P1, P2. - Thus, a total of two electric motors are provided, one for the supply of operating oil to the primary actuator group and one for the supply of operating oil to the secondary actuator group, thereby making it possible to reduce the amount of operating oil supplied during the sub-operations (revolving and blade reciprocating) which do not require a large amount of operating oil, and also to prevent needless energy consumption.
- The
hydraulic control device 30 is configured comprising a primarycontrol valve group 50, a secondarycontrol valve group 60, the above-described primary pumps P1, P2 and secondary pumps P3, P4, the first and second electric motors M1, M2, and an operatingoil tank 40, as shown inFIG. 2 . The primarycontrol valve group 50 is configured from left and righttravel control valves boom control valve 55, anarm control valve 56, abucket control valve 57, aswing control valve 58, and a quickhitch control valve 59 which respectively control the operating oil supplied to thetravel motors boom cylinder 15a, thearm cylinder 16a, thebucket cylinder 17a, the swingingcylinder 18a, and thequick hitch cylinder 90. The secondarycontrol valve group 60 is configured comprising ablade control valve 66 and a revolvingcontrol valve 68 for controlling the operating oil supplied to theblade cylinder 6a and therevolution motor 8. - The
boom control valve 55, thearm control valve 56, thebucket control valve 57, and the revolvingcontrol valve 68 are each configured comprising a spool, and are also configured so that the spools move according to the pilot pressure of the operating oil supplied through a remote control valve group 75 (described in detail hereinafter) and a pilot valve 72 (described in detail hereinafter), which are opened and closed by the secondary pump P4 according to the amount the operatingdevice 20 is operated. The operating oil is supplied from thepilot valve 72 through thepilot oil passage 70 to theboom control valve 55, thearm control valve 56, thebucket control valve 57, and the revolvingcontrol valve 68, and the supply of operating oil to theboom cylinder 15a, thearm cylinder 16a, thebucket cylinder 17a, and therevolution motor 8 can be controlled by the movement of the spools. In addition to the aforementioned remotecontrol valve group 75 andpilot valve 72, thepilot oil passage 70 is also provided with arelief valve 71, anaccumulator 73, apressure sensor 74, and other components. - The
relief valve 71 is a valve for relieving the operatingoil tank 40 of operating oil when the pilot pressure has risen above a predetermined set value, and is provided between thepilot valve 72 and the operatingoil tank 40. This pilot pressure is detected by thepressure sensor 74 which is provided between thepilot valve 72 and the remotecontrol valve group 75, and the detected pilot pressure is transmitted to acontrol device 90. Thecontrol device 90 is designed to be capable of controlling the activation (rotational speed) of the secondary pumps P3, P4 on the basis of the detected value. - The remote
control valve group 75 is configured from a revolution motorremote control valve 76, a boom cylinder actuation remote control valve, an arm cylinder actuation remote control valve, and a bucket cylinder actuation remote control valve, which are driven respectively by a revolving operation lever, a boom operation lever, an arm operation lever, and a bucket operation lever. Since the revolution motorremote control valve 76, the boom cylinder actuation remote control valve, the arm cylinder actuation remote control valve, and the bucket cylinder actuation remote control valve all have the same configuration, only the revolution motorremote control valve 76 is described hereinbelow, and only the revolution motorremote control valve 76 is shown inFIG. 2 . - The revolution motor
remote control valve 76 has a P port (a pump port) 76p, a T port (a tank port) 76t, and anA port 76a; and the secondary pump P4 is connected to theP port 76p, the operatingoil tank 40 is connected to theT port 76t, and thepilot valve 72 is connected to theA port 76a. TheP port 76p is usually blocked, but when the revolving operation lever is operated, theP port 76p is communicated with theA port 76a, operating oil from the secondary pump P4 is supplied to thepilot oil passage 70, and the pilot pressure (remote control pressure) thereof is outputted to the revolvingcontrol valve 68 via thepilot oil passage 70. - The
accumulator 73 is provided as being connected to thepilot valve 72, and is capable of storing up the operating oil discharged from the secondary pump P4. When the supply of operating oil from the secondary pump P4 is stopped, theaccumulator 73 is capable of releasing the stored up operating oil to thepilot oil passage 70, and oil pressure can be maintained by this storing up and releasing of operating oil. Since thepower shovel 1 uses a manual system (a link system) as described above, providing thisaccumulator 73 makes it possible to temporarily completely stop the secondary pump P4 supplying the pilot pressure while thepower shovel 1 is traveling. Specifically, even when the secondary pump P4 is stopped, the pilot pressure can be supplied from thepilot valve 72 to the hydraulic actuators (described in detail hereinafter) by the release of operating oil from theaccumulator 73. - In the
hydraulic control device 30 configured as described above, the needless supply of operating oil can be reduced by providing respective electric motors (the first and second electric motors M1, M2) to the primary actuator group and the secondary actuator group, and the reasons for this are described while referring toFIG. 3. FIGS. 3A and B show the respective torque frequency distributions in a case in which the primary pumps P1, P2 and the secondary pumps P3, P4 are activated using only one electric motor M, and a case in which the first and second electric motors M1, M2 are used, wherein the primary pumps P1, P2 are activated by the first electric motor M1 and the secondary pumps P3, P4 are activated by the second electric motor M2. In the graphs ofFIGS. 3A and B , the dashed lines show a torque frequency distribution in a case of one electric motor M and the solid lines show a torque frequency distribution in a case of two electric motors (M1, M2).FIG. 3A shows the torque frequency distribution of the first electric motor M1, andFIG. 3B shows the torque frequency distribution of the second electric motor M2. - When these torque frequency distributions are compared, in the case of using one electric motor as shown in
FIG. 3A , the torque frequency distribution remains substantially uniform between 0 and 50 (Nm). In the case of using two electric motors, the actuator connected to the first electric motor M1 is different from the actuator connected to the second electric motor M2, and the torque frequency distributions of the first electric motor M1 and the second electric motor M2 therefore concentrate at different values. Therefore, the electric motors can be efficiently utilized by selecting motors with similar frequency distributions and torque characteristics as the first and second electric motors M1, M2. For example, in a case in which the torque frequency distribution of the first electric motor M1 concentrates at 25 Nm as shown inFIG. 3A , the energy of the electric motor can be efficiently utilized by selecting amotor 102 having characteristics such that the torque frequency distribution concentrates at 25 Nm as shown inFIG. 3C as the first electric motor M1. -
FIG. 4 is referenced to describe the relationship between the pilot pressure when thepower shovel 1 is traveling and the rotational speed of the secondary pump P4 whose maximum rotational speed is 3800 rpm, for example, in thehydraulic control device 30. First, the pilot pressure attime 0 is 3.5 MPa, and the accumulation of pressure in theaccumulator 73 is complete at this time. After the secondary pump P4 has been stopped in this state, if the excavating operation is performed by the various operation levers of the operatingdevice 20, the excavating operation can be continued by the pilot pressure of the operating oil because the operating oil whose pressure has accumulated in theaccumulator 73 is released. When the operating oil proceeds to be released by theaccumulator 73, the pilot pressure begins to gradually decrease, and when thecontrol device 90 has detected that the pilot pressure has decreased to 1.0 MPa, for example, thecontrol device 90 activates the secondary pump P4 at approximately 1000 rpm, far lower than the maximum rotational speed. After the secondary pump P4 has been activated, the pilot pressure begins to rise and theaccumulator 73 again begins to accumulate pressure. Thecontrol device 90 then again stops the secondary pump P4 upon detecting that the pilot pressure has risen to 3.5 MPa, for example. - Thus, the operations of the
power shovel 1 can be continued even if the secondary pump P4 has been temporarily completely stopped. Furthermore, even when the pilot pressure has decreased, there is no need to rotate the secondary pump P4 at the maximum rotational speed (3800 rpm), and pilot pressure can still be supplied even if the secondary pump P4 is activated at a lower rotation. The aforementioned pilot pressure upper limit (3.5 MPa) and lower limit (1.0 MPa) and the rotational speed (1000 rpm) of the secondary pump P4 are not limited to the aforementioned values and can be varied as desired. - The hydraulic control device in the embodiment described above is provided with a total of two electric motors, one for the primary actuator group and one for the secondary actuator group, whereby the supply of needless energy by the electric motors can be reduced. Providing the
accumulator 73 makes it possible to reduce or temporarily stop the rotational speed of the secondary pump P4, and an energy conservation effect can be achieved. - The present invention should not be interpreted as being limited to the embodiment described above, and suitable improvements can be made within a range that does not deviate from the scope of the present invention. For example, in the embodiment described above, an example was described in which the
accumulator 73 was provided and the rotational speed of the secondary pump P4 was reduced or temporarily stopped, but the rotational speeds of the primary pumps P1, P2 can also be reduced or temporarily stopped by providing the same accumulators to the oil passages for operating oil supplied from the primary pumps P1, P2. - In the embodiment described above, an example was described in which the first and second electric motors M1, M2 were provided respectively to the primary pumps P1, P2 and the secondary pumps P3, P4, thereby allowing different torque frequency distributions to be obtained and the energy of the electric motors to be efficiently utilized, but the method of disposing electric motors is not limited to this example, and electric motors may also be provided respectively to the first hydraulic pump P1 and the second hydraulic pump P2, for example. Different torque frequency distributions can be obtained and the energy of the electric motors can be more efficiently utilized even when the electric motors are provided in this manner.
- Next, a second preferred embodiment according to the present invention will be described. In this embodiment as well, a crawler-
type power shovel 1 having the same configuration as described above is used as the construction machine according to the present invention. Structural components identical to those of thepower shovel 1 are denoted by the same numbers and are not described. - This embodiment has a description of the primary actuator group for performing the above-described main operations (the left and
right travel motors boom cylinder 15a, thearm cylinder 16a, thebucket cylinder 17a, and the swingingcylinder 18a), and the configuration for controlling the supply of operating oil (oil pressure) to the main operation actuator group. In this embodiment, ahydraulic control device 110 is provided for performing operating oil supply control for the main operation actuator group. Thishydraulic control device 110 is configured as shown inFIG. 5 , and the amount and direction of operating oil supplied to the hydraulic actuators are controlled according to the operation of the operatingdevice 20 by the operator, thereby enabling traveling, excavating, and other operations of thepower shovel 1. - The
hydraulic control device 110 is configured comprising first and secondcontrol valve groups inverter 136, avolumetric cylinder 137, first andsecond pressure sensors oil tank 140, acontroller 150, abattery 160, and other components, as shown inFIG. 5 . The firstcontrol valve group 120 is configured comprising a lefttravel control valve 121, a boomtravel control valve 122, and abucket control valve 132 for performing controls such as the amount of operating oil supplied to theleft travel motor 7L, theboom cylinder 15a, and thebucket cylinder 17a, respectively. The secondcontrol valve group 130 is configured comprising a righttravel control valve 131, anarm control valve 123, and aswing control valve 133 for performing controls such as the amount of operating oil supplied to theright travel motor 7R, thearm cylinder 16a, and the swingingcylinder 18a, respectively. The boomtravel control valve 122, thearm control valve 123, and thebucket control valve 132 each house a spool, and the spools can be moved by pilot pressure supplied from a pilot valve (not shown). Factors such as the amount of operating oil supplied to theboom cylinder 15a, thearm cylinder 16a, and thebucket cylinder 17a can be controlled by this spool movement. - The first and second hydraulic pumps P1, P2 are provided in order to perform the traveling and excavating of the power shovel 1 (the actuating of the power shovel mechanism 5), connected with the output shaft (not shown) of the electric motor M, and configured so as to both discharge operating oil obtained from the operating
oil tank 140 along with the driving of the electric motor M. The first and second hydraulic pumps P1, P2 are so-called swash plate piston pumps having swash plates (not shown), wherein the angles of the swash plates can be varied. The amount of operating oil discharged (discharge amount) can be varied by varying these angles. - In the first and second hydraulic pumps P1, P2 in the present embodiment, the discharge volume is not controlled (feedback control) based on the pressure of the discharged operating oil (the detected values of the first and
second pressure sensors FIG. 6 . The electric motor M is driven by a supply of AC electricity which has a predetermined voltage and frequency and which has been converted via theinverter 136 from DC electricity supplied from thebattery 160 described hereinafter. - The first and
second pressure sensors first pressure sensor 138 detects the pressure of operating oil discharged from the first hydraulic pump P1, while thesecond pressure sensor 139 detects the pressure of operating oil discharged from the second hydraulic pump P2. The oil pressures detected by the first andsecond pressure sensors controller 150. - The
controller 150 is capable of detecting the remaining battery power from the value of the electric current supplied from thebattery 160 described hereinafter, and thecontroller 150 outputs a volume variation signal to thevolumetric cylinder 137 in accordance with the detected remaining battery power. Thevolumetric cylinder 137 is configured to be free to reciprocate, and is designed so as to reciprocate according to the volume variation signal. The angles of the swash plates of the first and second hydraulic pumps P1, P2 can be varied according to this reciprocation, and thevolumetric cylinder 137 can vary the maximum volumes of the first and second hydraulic pumps P1, P2 by varying the angles of the swash plates. - The
battery 160 is provided in order to supply DC electricity to theinverter 136 and thecontroller 150, and the maximum value of the battery's output electric current is 30 A in this embodiment. The pressure of the operating oil discharged from the first and second hydraulic pumps P1, P2 increases in proportion to this output electric current. Both the relationship between the size of the electric current supplied from thebattery 160 and the pressure (oil pressure) of the operating oil discharged from the first and second hydraulic pumps P1, P2, and the relationship between the rotational speed of the electric motor M and the oil pressure, are such that when the load torque of the electric motor M increases, the rotational speed of the electric motor M is maintained at a constant value as shown inFIGS. 7A and B , and the oil pressure and electric current supplied from thebattery 160 therefore increase as well. When the load torque reaches a certain constant value or greater, the electric current reaches an upper limit of 30 A and does not increase any further, and the rotational speed of the electric motor M decreases. The output of the electric motor M is 7 kW in the present embodiment. - The operating
device 20 is configured from a travel operating lever for operating the travel of thepower shovel 1; and a boom operating lever, an arm operating lever, a bucket operating lever, and the like for operating a boom, an arm, a bucket, and other components. The operatingdevice 20 is provided with an energy-savingmode switch 20a, the energy-savingmode switch 20a is capable of being turned on and off, and the energy-savingmode switch 20a can switch to an energy-saving mode when turned on and switched to a normal mode when turned off. When the energy-savingmode switch 20a is turned on to switch to energy-saving mode, thecontroller 150 performs a control for reducing the maximum volume of the first and second hydraulic pumps P1, P2 in accordance with the decrease in remaining battery power of thebattery 160. Specifically, when the maximum volume of the first and second hydraulic pumps P1, P2 is lowered as shown by the arrow and dashed line inFIG. 6 , the discharge volumes do not exceed the maximum volume even if the discharge pressure decreases, and the amount of electricity output by thebattery 160 can therefore be minimized. Thus, in energy-saving mode, the amount of electricity can be minimized by reducing the maximum volume and thebattery 160 can be used over a longer period of time. In normal mode, on the other hand, thecontroller 150 is not made to reduce the maximum volume of the first and second hydraulic pumps P1, P2, and thecontroller 150 can be made to actuate the hydraulic actuators quickly. - In the
hydraulic control device 110 configured as described above, by providing energy-saving mode and making thecontroller 150 perform control so that the maximum volume of the first and second hydraulic pumps P1, P2 is reduced according to the decrease in the remaining battery power, the electricity consumed by thebattery 160 is minimized and the active time duration can be extended. The operating speed also decreases when energy-saving mode is activated and the volume of the first and second hydraulic pumps P1, P2 is reduced, but it is also possible to not lower oil pressure (power), and the operator can be made aware from this speed decrease that the remaining battery power has decreased. Specifically, when the first and second hydraulic pumps P1, P2 are activated at a point in time when the remaining battery power is 100%, during which the maximum volume of the first and second hydraulic pumps P1, P2 is 4.5 cc/rev, for example, the remaining battery power gradually decreases from 100% as shown inFIG. 8 . When thecontroller 150 then detects that the remaining battery power has decreased to 50%, the controller outputs a volume variation signal to thevolumetric cylinder 137, and thevolumetric cylinder 137 varies the angles of the swash plates of the first and second hydraulic pumps P1, P2 to reduce the maximum volume. At this time, the speeds of the hydraulic actuators decrease, and the operator can perceive that the remaining battery power is low. The maximum volume is designed to decrease to 3.0 cc/rev when the remaining battery power reaches 0%. - As described above, since the
hydraulic control device 110 in the above-described embodiment is capable of reducing the maximum volume of the first and second hydraulic pumps P1, P2 in accordance with the decrease in the remaining battery power, the active time duration of thebattery 160 can be extended. During energy-saving mode in which the maximum volume of the first and second hydraulic pumps P1, P2 is reduced in accordance with the decrease in remaining battery power, the electric current output from thebattery 160 can be reduced in comparison with normal mode in which the maximum volume is not varied, as shown inFIG. 7A . - In the embodiment described above, an example was described in which the first and
second pressure sensors controller 150, and thecontroller 150 outputs a volume variation signal to thevolumetric cylinder 137 to vary the volume of the first and second hydraulic pumps P1, P2, but the configurations of the controller and volumetric cylinder are not limited to this example. - For example, in the
hydraulic control device 110 having a configuration such as the one shown inFIG. 5 , signal conversion means (not shown) for converting electric signals to oil pressure signals, such as a proportional valve, must be provided between thecontroller 150 and thevolumetric cylinder 137. In view of this, this type of configuration may be modified and an ON-OFFvalve 145, which communicates with the oil passages of operating oil discharged from the first and second hydraulic pumps P1, P2, may be provided between the oil passages and thevolumetric cylinder 137 as shown inFIG. 9A . With this type of configuration, the first andsecond pressure sensors valve 145 and thecontroller 150 can be less expensive models than the proportional valve and the controller described above, and the overall cost of the hydraulic control device can therefore be lowered. - The
volumetric cylinder 137 in the configuration shown inFIG. 9A can have a spring or another elastic member attached, and the relationship between discharge volume and pressure of the first and second hydraulic pumps P1, P2 in the case of no elastic member is shown inFIG. 9B , while the relationship in the case of the elastic member is shown inFIG. 9C . Specifically, in the case of no elastic member, the first and second hydraulic pumps P1, P2 are configured to vary their volumes based on their own pressures, and the discharge volume in energy-saving mode (refer to the dashed line inFIG. 9B ) is therefore the same as the discharge volume during normal mode (refer to the solid line inFIG. 9B ) when the discharge pressure is 0, but the discharge volume decreases progressively as the pressure increases from 0, and after decreasing to a certain extent, the discharge volume remains constant even if the pressure is then increased. In the case of an elastic member, on the other hand, the discharge volume in energy-saving mode (refer to the dashed line inFIG. 9C ) is the same as the discharge volume during normal mode (refer to the solid line inFIG. 9C ) even if the discharge pressure is increased to a certain extent from 0, but the pressure gradually decreases upon reaching a predetermined value or greater. This predetermined value can be varied by using an elastic member of a different elastic force as the elastic member of thevolumetric cylinder 137. - Thus, with a configuration such as the one shown in
FIG. 9A , cost can be lowered, and the relationship between the discharge volume and discharge pressure of the pumps can be varied as shown inFIGS. 9B and C , for example, by attaching and detaching the elastic member to and from thevolumetric cylinder 137 and by varying the elastic force of the elastic member. Furthermore, the discharge volume can be reduced incrementally according to the increase in discharge pressure, and so-called two-stage control can be performed in which the discharge pressure is varied in two stages. - The present invention should not be interpreted to be limited to the above embodiments, and suitable improvements can be made within a range that does not deviate from the scope of the present invention. For example, in the present embodiment, an example was described in which two hydraulic pumps were provided, but the number of hydraulic pumps is not limited to two, and the present invention can still be applied even if one, three, or more pumps are provided. The output of the electric motor M (7.0 kW), the maximum volumes of the first and second hydraulic pumps P1, P2 (4.5 cc/rev and 3.0 cc/rev), and the maximum output electric current of the battery 160 (30 A) are not limited to these values and can be varied as desired.
-
- P1, P2:
- first and second primary hydraulic pumps
- P3, P4:
- first and second secondary hydraulic pumps
- M1:
- first electric motor
- M2:
- second electric motor
- 1:
- power shovel (construction machine)
- 8:
- revolving motor (secondary actuator group)
- 15a:
- boom cylinder (primary actuator group)
- 16a:
- arm cylinder (primary actuator group)
- 17a:
- bucket cylinder (primary actuator group)
- 20:
- operating device (actuator operating means)
- 30:
- hydraulic control device
- 50:
- primary control valve group (operating oil control valves)
- 60:
- secondary control valve group (operating oil control valves)
- 72:
- pilot valve (pilot pressure output means)
- 73:
- accumulator
- 74:
- pressure sensor
- 75:
- remote control valve group (pilot pressure output means)
- 90:
- control device (motor control means)
Claims (8)
- Power shovel (1), comprising:- a travel device (2) having left and right hydraulically driven travel mechanisms;- a revolving mechanism (3) provided on the travel device (2);- a driver cabin (4) provided on the revolving mechanism (3) and capable of horizontal revolution;- a power shovel mechanism (5) attached on the front of the driver cabin (4) and capable of horizontal revolution with the driver cabin, the power shovel mechanism comprising:- - a boom (15) pivotally connected to the front of the driver cabin (4);- - an arm (16) pivotally connected to the end of the boom (15); and- - a bucket (17) pivotally connected to the end of the arm;- a control device, comprising:- - a primary hydraulic actuator group comprising:- - - a left travel hydraulic motor (7L);- - - a right travel hydraulic motor (7R);- - - a boom cylinder (15a) to swing the boom (15) up and down;- - - an arm cylinder (16a) to swing the arm (16) up and down;- - - a bucket cylinder (17a) to swing the bucket (17) up and down; and- - - swinging cylinder (18a) to swing the boom (15) in the horizontal direction;- - a secondary hydraulic actuator group comprising:
- - - a revolution motor (8) to drive the revolving mechanism (3);- - a primary hydraulic pump (P1, P2) for supplying the primary hydraulic actuator group (7R, 7L, 15a, 16a, 17a, 18a) with operating oil for actuating the primary hydraulic actuator group;- - a first electric motor (M1) for driving the primary hydraulic pump (P1, P2);- - a secondary hydraulic pump (P3, P4) for supplying the secondary hydraulic actuator group (8) with operating oil for actuating the secondary hydraulic actuator group, the secondary hydraulic pump (P3, P4) having a lower volume than the primary hydraulic pump (P1, P2);- - a second electric motor (M2) for driving the secondary hydraulic pump (P3, P4);- - first hydraulic actuator operating means (60) being operable by an operator in order to perform actuation control on the primary hydraulic actuator group (7R, 7L, 15a, 16a, 17a, 18a);- - second hydraulic actuator operating means (60) being operable by an operator in order to perform actuation control on the secondary hydraulic actuator group (8);- - pilot pressure output means (72, 75) which uses operating oil supplied by the secondary hydraulic pump (P3, P4) to output a pilot pressure according to the operation of the first hydraulic actuator operating means (50) and the second hydraulic actuator operating means (60);- - a first operating oil control valve which is driven by a first pilot pressure outputted by the pilot pressure output means (72, 75) in accordance with the operation of the first hydraulic actuator operating means (50) and which performs flow rate control on the operating oil supplied from the primary hydraulic pump (P1, P2) to the primary hydraulic actuator group (7R, 7L, 15a, 16a, 17a, 18a) so that the flow rate of the operating oil reaches a rate corresponding to the first pilot pressure; and- - a second operating oil control valve which is driven by a second pilot pressure outputted by the pilot pressure output means (72, 75) in accordance with the operation of the second hydraulic actuator operating means (60) and which performs flow rate control on the operating oil supplied from the secondary hydraulic pump (P3, P4) to the secondary hydraulic actuator group (8), so that the flow rate of the operating oil reaches a rate corresponding to the second pilot pressure, characterized in that
the primary hydraulic pump (P1, P2) comprises a first primary hydraulic pump (P1) of the variable type and a second primary hydraulic pump (P2) of the variable type, both of which are driven by the first electric motor (M1), in which-- the first primary hydraulic pump (P1) is adapted to supply hydraulic oil to the left travel hydraulic motor (7L), the boom cylinder (15a) and the arm cylinder (16a);-- the second primary hydraulic pump (P2) is adapted to supply hydraulic oil to the right travel hydraulic motor (7R), the bucket cylinder (17a) and the swinging cylinder (18a);-- the first secondary hydraulic pump (P3) being adapted to supply hydraulic oil to the revolution motor (8); and-- the second secondary hydraulic pump (P4) being adapted for supplying hydraulic oil to the pilot pressure output means (72, 75). - Power shovel (1) as claimed in claim 1, characterized in that- the power shovel mechanism (5) also comprises a blade (6) connected to the travel device (2) and capable of swinging up and down,- that the secondary actuator group comprises a blade cylinder (6a) to swing the blade (6) up and down, and- that the first secondary hydraulic pump (P3) is adapted to supply hydraulic oil to the blade cylinder (6a).
- Power shovel as claimed in claim 1 or 2, characterized in that the pilot pressure output means (72, 75) has an accumulator (73) which stores operating oil supplied by the secondary hydraulic pump (P3, P4) and which can output this stored operating oil with a steady oil pressure.
- Power shovel as claimed in claim 1, 2 or 3, characterized in that the hydraulic control device comprises pilot pressure detection means (74) for detecting a value of the pilot pressure outputted by the pilot pressure output means (72, 75) and motor control means (90) for detecting the pilot pressure value detected by the pilot pressure detection means (74) and causing the second electric motor (M2) to be driven when the pilot pressure value is equal to or less than a predetermined value.
- Power shovel as claimed in claim 1, 2, 3 or 4, characterized in that the primary hydraulic pump (P1, P2) is configured from a variable-volume hydraulic pump and that the hydraulic control device further comprises volume-varying means for varying a maximum permissible volume of the primary hydraulic pump, a battery (160) for supplying the first electric motor (M1) with electricity for driving the first electric motor (M1) and a controller (150) which detects remaining battery power of the battery (160) and performs a control for actuating the volume-varying means and reducing the maximum permissible volume of the primary hydraulic pump (P1, P2) in accordance with a decrease in the remaining battery power.
- Power shovel as claimed in claim 5, characterized in that the hydraulic control device comprises a switch (20a) capable of switching the controller (150) between performing and not performing the control for reducing the maximum permissible volume of the primary hydraulic pump (P1, P2).
- Power shovel as claimed in claim 5 or 6, characterized in that the secondary hydraulic pump (P3, P4) is configured from a variable-volume hydraulic pump; the hydraulic control device comprises second volume-varying means for varying the maximum permissible volume of the secondary hydraulic pump; electricity for driving the second electric motor (M2) is supplied to the second electric motor from the battery and the hydraulic control device is configured so that the controller (150) detects the remaining battery power of the battery (160) and performs a control for actuating the second volume-varying means and reducing the maximum permissible volume of the secondary hydraulic pump (P3, P4) in accordance with the decrease in the remaining battery power.
- Power shovel as claimed in claim 7, characterized in that the hydraulic control device comprises a second switch capable of switching the controller (150) between performing and not performing the control for reducing the maximum permissible volume of the secondary hydraulic pump.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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JP2009145458A JP5096417B2 (en) | 2009-06-18 | 2009-06-18 | Hydraulic control equipment for construction machinery |
JP2009147939A JP2011002085A (en) | 2009-06-22 | 2009-06-22 | Hydraulic control device for construction machine |
PCT/JP2010/004052 WO2010146866A1 (en) | 2009-06-18 | 2010-06-17 | Hydraulic control device for construction machine |
Publications (3)
Publication Number | Publication Date |
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EP2444555A1 EP2444555A1 (en) | 2012-04-25 |
EP2444555A4 EP2444555A4 (en) | 2016-12-21 |
EP2444555B1 true EP2444555B1 (en) | 2021-02-17 |
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EP10789245.7A Active EP2444555B1 (en) | 2009-06-18 | 2010-06-17 | Power shovel |
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WO (1) | WO2010146866A1 (en) |
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KR20140074324A (en) | 2011-10-07 | 2014-06-17 | 볼보 컨스트럭션 이큅먼트 에이비 | Priority control system for construction machine |
JP6419063B2 (en) | 2015-12-24 | 2018-11-07 | 日立建機株式会社 | Hybrid work machine |
JP6463537B1 (en) * | 2018-05-11 | 2019-02-06 | 株式会社竹内製作所 | Hydraulic drive device for hydraulic excavator |
JP7370724B2 (en) | 2019-04-05 | 2023-10-30 | 株式会社竹内製作所 | Operation control device for work vehicles |
JP7370725B2 (en) * | 2019-04-05 | 2023-10-30 | 株式会社竹内製作所 | Operation control device for work vehicles |
BE1027189B1 (en) | 2019-04-11 | 2020-11-10 | Gebroeders Geens N V | Drive system for a work vehicle |
EP3929141A1 (en) | 2020-06-24 | 2021-12-29 | Hiab AB | Working equipment with electrically powered hydraulically operated arm arrangement |
BE1028704B1 (en) | 2020-10-14 | 2022-05-18 | Gebroeders Geens N V | Drive system for a work vehicle |
AT525609A1 (en) * | 2021-11-09 | 2023-05-15 | Wacker Neuson Linz Gmbh | Device for driving a mobile, in particular electrical machine |
Citations (1)
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JP2000273913A (en) * | 1999-03-24 | 2000-10-03 | Daikin Ind Ltd | Battery operated working machine |
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JP3897875B2 (en) * | 1997-10-06 | 2007-03-28 | コベルコ建機株式会社 | Battery operated hydraulic work machine |
JP3969068B2 (en) * | 2001-11-21 | 2007-08-29 | コベルコ建機株式会社 | Actuator drive device for hybrid work machine |
JP4769670B2 (en) | 2006-09-11 | 2011-09-07 | 日立建機株式会社 | Actuator drive device for construction machinery |
JP4601635B2 (en) | 2007-03-05 | 2010-12-22 | 日立建機株式会社 | Electric construction machine |
-
2010
- 2010-06-17 EP EP10789245.7A patent/EP2444555B1/en active Active
- 2010-06-17 WO PCT/JP2010/004052 patent/WO2010146866A1/en active Application Filing
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JP2000273913A (en) * | 1999-03-24 | 2000-10-03 | Daikin Ind Ltd | Battery operated working machine |
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EP2444555A1 (en) | 2012-04-25 |
WO2010146866A1 (en) | 2010-12-23 |
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