JPH09256415A - Work machine operation device for hydraulic construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work machine operation device capable of improving the operability of attachments such as an offset laid on a work machine, and efficiently performing a work by use of the attachments. SOLUTION: The grip part 12a of an operation lever 12a is provided with operation buttons 34a and 34b for operating an offset cylinder 9. When an operator presses the operation buttons 34a and 34b using his/her fingers, the arithmetic operation part of a controller 36 calculates the coordinate position of a work machine on the basis of output signals from the operation buttons 34a and 34b, and angle sensors 35a to 35c, thereby judging the attitude of the work machine. When the work machine is judged to have a working attitude, for example, the controller outputs a normal control signal to an offset flow control valve 25, and actuates the offset cylinder 9 at a normal speed. On the other hand, when the work machine is judged to have a turning attitude at a small radius, a deceleration control signal is sent out to the offset flow control valve 25, thereby slowly operating the offset cylinder 9 at a decelerated speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working machine operating device for a hydraulic construction machine, and more particularly to a hydraulic construction machine suitable for use in a construction machine such as a hydraulic excavator equipped with an actuator for attachment such as an offset cylinder. Work machine operation device.

[0002]

2. Description of the Related Art Generally, in a hydraulic excavator having an offset mechanism, when the working machine is switched from a working posture in which it is extended forward to a small swinging posture in which the working machine is pulled toward you and held, the offset is performed while preventing spillage of a bucket. Since it is necessary to operate the two operating levers with both hands, turning, boom raising, arm pulling and horizontal holding of the bucket are performed, and at the same time, offset operation is performed by depressing the operating pedal. ing.

Further, recent hydraulic excavators are provided with a foot-operated accelerator pedal for accelerating an offset operation or the like, as described in, for example, Japanese Patent Application Laid-Open No. 7-238574, and if necessary, this accelerator pedal is used. There is also proposed a method in which an offset operation or the like is quickly performed by stepping on the pedal, and a fine operation is performed while the accelerator pedal is not operated.

FIG. 7 is a side view showing the overall construction of a conventional hydraulic excavator, and FIG. 8 is an explanatory view of the inside of the cab of the hydraulic excavator.

In FIG. 7, 1 is a traveling body, 2 is a driver's cab 3.
Is a revolving superstructure disposed above the traveling body 1, and the traveling body 1 and the revolving body 2 form a main body of the hydraulic excavator. Reference numeral 4 is an offset boom, 5 is an arm rotatably connected to the tip of the boom 4, 6 is a bucket rotatably connected to the tip of the arm 5, and these boom 4, arm 5 and bucket 6 are The working machine 7 is configured. The boom 4 includes a first boom 4a that is rotatably connected to the right side of the operator's cab 3, and a second boom 4c that is connected to the tip of the first boom 4a via a connecting member 4b. There is. Reference numeral 8 is a boom cylinder that drives the first boom 4a, 9 is an offset cylinder that drives the second boom 4c, 10 is an arm cylinder that drives the arm 5, and 11 is a cylinder.
Is a bucket cylinder that drives the bucket 6, and
The boom 4c is laterally translated by the offset cylinder 9 with respect to the first boom 4a.

As shown in FIG. 8, operating levers 12, 13, 14, 15 and an operating pedal 16 and an accelerator pedal 17 are installed near the seat 3a in the cab 3, and these are installed. It is operated by the limbs of the operator. For example, when the operator grips the right operation lever 12 located in front of the seat 3a in the operator's cab 3 with the right hand and appropriately operates in the front-back direction, the boom flow rate control valve (not shown) supplies the boom cylinder 8 with the boom cylinder 8. Since the amount of pressure oil supplied is controlled, the boom 4 rotates. Similarly, when the right operating lever 12 is appropriately operated in the lateral direction, the bucket 6 is rotated by driving the bucket cylinder 11. Similarly,
When the left operation lever 13 located to the left front of the seat 3a is grasped with the left hand and appropriately operated in the front-rear direction, a turning operation is performed, and when the left operation lever 13 is appropriately operated in the lateral direction, an arm operation is performed, When the pair of traveling levers 14 and 15 located in front of the seat 3a are appropriately operated in the front-rear direction, a right traveling operation and a left traveling operation are performed. Further, when the operation pedal 16 located on the right side of the traveling lever 14 is properly depressed in the front-rear direction, the amount of pressure oil supplied from the offset flow control valve (not shown) to the offset cylinder 9 is controlled. The offset operation is performed, and when the accelerator pedal 17 located near the operation pedal 16 is further depressed, the operations of the offset cylinder 9 and the like are accelerated.

[0007]

In the conventional work equipment operating device for a hydraulic excavator described above, the operating pedals 16 and the accelerator pedal 17 are operated by the feet while operating the operating levers 12, 13 with both hands during work. There are cases. For example, when it is predicted that the bucket 6 and the cab 3 interfere with each other when the working posture of the work implement 7 extended from the forward posture to the small turning posture as shown in FIG. There is a case where turning the boom, raising the boom, pulling the arm and horizontally holding the bucket are performed by operating 13, and a right offset operation is performed by operating the operation pedal 16. However, in such a stepping operation, the operator must step on the operation pedal 16 while holding his / her body with one foot while sitting on the seat 3a. Therefore, not only the operation is unstable, but also the operation lever 12 is operated by the operator's hand. , 13 compared to the case of handling, there is a problem that the operation feeling is inferior and the fine operation is difficult. Further, when the accelerator pedal 17 is depressed as necessary, it is necessary to switch from the operation pedal 16 to the accelerator pedal 17, and this operation is complicated and inconvenient.

As the actuator for driving the attachments, in addition to the offset cylinder 9, a swing cylinder for laterally moving a part of the working machine, a telescopic cylinder for expanding and contracting the working machine, and the like are used. However, since these swing cylinders and telescopic cylinders are also operated by a foot-operated operation pedal, there is a problem similar to the above.

The present invention has been made in view of the above-mentioned circumstances of the prior art, and an object thereof is to improve the operability of attachments such as an offset provided in a working machine and to use the attachments. It is an object of the present invention to provide a working machine operating device for a hydraulic construction machine that enables efficient work.

[0010]

In the present invention, first, an actuator for driving an attachment such as an offset provided in a working machine is operated by a finger with a button type switch, and this switch is operated with another actuator. It was decided to place it at the grip of the operating lever.
In this case, when the button type switch is operated, only the ON / OFF signal is output from the switch.
It is not possible to adjust the operating speed of the actuator that operates according to the OFF signal. For example, if the offset cylinder is operated with a button type switch, the offset operation will be performed at full speed even when the working machine is held in a small turning posture by holding it toward you. It is carried out, and there is concern about malfunctions such as load spillage due to start-up and stop shocks.

Therefore, in the present invention, in addition to the above configuration,
Attitude detection means for detecting the attitude of the working machine and a controller for controlling the operation of the actuator flow control valve operated by a button type switch are provided, and when the operator manually pushes the switch, the attitude and the attitude detection are performed. A control signal is output from the controller to the flow control valve based on each output signal from the means. For example, when the work machine is in a work posture in which it is extended forward, a normal control signal is output from the controller, and a predetermined flow rate of hydraulic oil is supplied to the actuator based on the normal control signal. On the other hand, in the case of a small turning posture in which the working machine is pulled toward you and held, the controller outputs a control signal during deceleration, and based on the control signal during deceleration, the flow rate of the hydraulic oil supplied to the actuator is Use less than the prescribed amount.

According to the present invention having such a configuration, while maintaining a stable posture without requiring a stepping operation of the operation pedal,
The operator can easily operate the attachments such as offset with a button-type switch by hand, and the controller automatically controls the flow rate of hydraulic oil supplied to the actuator according to the posture of the working machine to make a small turn. In the posture, the operating speed of the actuator can be slowed down compared to the normal speed. Therefore, the operability of the attachments can be improved, and since the attachments quickly move when the working machine is in the work posture, the work using the attachments can be efficiently performed.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION In a working machine operating device for a hydraulic construction machine of the present invention, a main body having a driver's cab, a working machine rotatably provided on the side of the driver's cab of the main body, In a working machine operating device for a hydraulic construction machine, which includes a plurality of actuators that respectively drive respective members constituting the working machine, and a plurality of flow rate control valves that respectively control the flow rates of hydraulic oil supplied to these actuators, An operation lever that operates at least one of the plurality of actuators, a button switch that is provided at the grip of the operation lever and that operates another actuator, and an attitude detection device that detects the attitude of the working machine. Means and a controller for controlling the operation of the actuator flow control valve operated by the switch, and each output signal from the switch and the attitude detecting means. Based on, it is from the controller configured to output a control signal to the flow control valve.

The switch may be any switch as long as it can be switched between ON and OFF, but it can be turned on by a pressing operation.
・ Push switch that switches off is preferable.

Further, since the operation of the actuator is decelerated from the normal time even in response to the load applied to the working machine, a load detecting means for detecting the load applied to the working machine is provided, and the switch, the posture detecting means and the load detecting means are provided. It is also possible to output a control signal from the controller based on each output signal from the controller.

Further, in order to apply to a hydraulic construction machine equipped with a pilot control circuit, an electromagnetic proportional valve which operates according to a control signal from a controller is installed in a pilot line for guiding pilot oil to the actuator flow control valve. A valve can be provided.

Further, in order to cope with a wide variety of working machine applications, a foot-operated operation pedal is provided in parallel with the switch, and the same operation is performed by selectively operating one of the switch and the foot-operated operation pedal. It is preferable to operate the actuator.

Further, since the fine operation and the normal operation of the actuator are selectively used according to the work content, a foot-operated accelerator pedal for accelerating the operation of the actuator operated by the switch may be provided in parallel.

Further, the actuator operated by the switch may be any one as long as it drives attachments such as a swing cylinder and a telescopic cylinder, but since it is applied to a small swing hydraulic excavator, a part of the working machine is used. An offset cylinder that moves the laterally is preferred.

[0020]

Embodiments will be described with reference to the drawings.
FIG. 1 is a hydraulic circuit diagram of a hydraulic excavator including a working machine operating device for a hydraulic construction machine according to a first embodiment of the present invention, and FIG. 2 is a block diagram showing an overall configuration of the working machine operating device shown in FIG. 3 is a characteristic diagram for explaining the correlation between the operating state of the operation button provided in the work implement operating device of FIG. 1 and the control pilot oil, and FIG. 4 is an explanatory diagram of the inside of the operating room of the hydraulic excavator,
The parts corresponding to those in FIGS. 7 and 8 described above are designated by the same reference numerals.

In FIG. 1, 18 is a turning motor, 19 is a right traveling motor, 20 is a left traveling motor, 21 and 22 are hydraulic pumps and pilot pumps driven by an engine not shown respectively, and 23 and 24 are hydraulic pumps 21 respectively. And a boom cylinder 8 and a bucket cylinder 11 serving as a first actuator, and a flow rate control valve that controls the flow rate of the hydraulic oil discharged from the hydraulic pump 21, and 25 is an offset serving as the hydraulic pump 21 and the second actuator. A flow rate control valve 26, which is provided between the hydraulic pump 21 and the cylinder 9, and controls the flow rate of the hydraulic oil discharged from the hydraulic pump 21, is provided between the hydraulic pump 21 and the other actuators 10, 18 to 20, respectively. Pump 2
1, a flow control valve for controlling the flow rate of the hydraulic oil discharged from 1.
27 is a boom control pilot valve, 28 is an arm control pilot valve, 29 is a bucket control pilot valve, 3
0 is a pilot valve for offset control, 31 is a pilot valve for turning control, 32 is a pilot valve for right running control, 33
Is a pilot valve for left travel control.

The pilot valves 27 to 33 are interlocked with the operating levers 12 to 15 and the operating pedal 16 shown in FIG. 3, and, for example, when the operator holds the right operating lever 12 with his right hand and operates it in the front-rear direction, A pilot pressure signal corresponding to the operation amount is supplied from the boom control pilot valve 27 to the boom flow control valve 23, and the amount of pressure oil supplied to the boom cylinder 8 is controlled based on the pilot pressure signal. Similarly, when the right operation lever 12 is appropriately operated in the lateral direction, the pressure oil supplied from the bucket flow control valve 24 to the bucket cylinder 11 is changed based on the pilot pressure signal output from the bucket control pilot valve 29. The supply is controlled. When the left operation lever 13 is grasped with the left hand and appropriately operated in the front-back direction, a pilot pressure signal corresponding to the operation amount is supplied from the swing control pilot valve 31 to the swing flow control valve 26, and the pilot pressure signal is supplied. The amount of pressure oil supplied to the swing motor 18 is controlled based on the above. Similarly, when the left operation lever 13 is appropriately operated in the lateral direction, the pressure oil supplied from the arm flow control valve 26 to the arm cylinder 10 is changed based on the pilot pressure signal output from the arm control pilot valve 28. The supply is controlled. Further, when the pair of travel levers 14 and 15 are appropriately operated in the front-rear direction, a pilot pressure signal corresponding to the operation amount produces a right travel control pilot valve 32.
The amount of pressure oil supplied from the left travel control pilot valve 33 to each travel flow control valve 26 and supplied to the right travel motor 19 and the left travel motor 20 is controlled based on the pilot pressure signal.

When the operation pedal 16 is properly depressed in the front-rear direction, a pilot pressure signal corresponding to the operation amount is supplied from the offset control pilot valve 30 to the offset flow control valve 25, and based on the pilot pressure signal. Thus, the amount of pressure oil supplied to the offset cylinder 9 is controlled. Further, when the accelerator pedal 17 located near the operation pedal 16 is depressed, the operation of the offset cylinder 9 and the like is accelerated.

As shown in FIG. 2, the working machine operating apparatus according to the present embodiment has a pair of operation buttons 34a and 34b for operating the offset cylinder 9 in two opposite directions, that is, in the extending direction and the contracting direction. , A boom angle sensor 35 as a posture detecting means for detecting the posture of the working machine 7 in FIG.
a, arm angle sensor 35b and offset angle sensor 3
5c, a controller 36 to which the pair of operation buttons 34a, 34b and the angle sensors 35a, 35b, 35c are connected, and electromagnetic proportional valves 37, 38 that open and close according to a control signal output from the controller 36. ing. The operation buttons 34a and 34b are push switches for performing ON / OFF operations.
4b is a grip portion 12 of the right operation lever 12 as shown in FIG.
It is provided in a. Further, the boom angle sensor 35a is provided at the fulcrum portion of the first boom 4a in FIG. 7, detects the relative angle between the revolving unit 2 and the first boom 4a, and the arm angle sensor 3
5b is provided at the fulcrum portion of the arm 5 of FIG. 7, detects the relative angle between the second boom 4c and the arm 5, and the offset angle sensor 35c is provided at the fulcrum portion of the connecting member 4b of FIG.
The relative angle between the first boom 4a and the link member 4b, that is, the offset angle is detected.

The controller 36 also has an input section 39 for inputting output signals from the pair of operation buttons 34a and 34b and the angle sensors 35a to 35c, and the angle sensor 3.
The coordinate position of the working machine 7 is calculated based on each output signal from 5a to 35c, and, for example, it is determined whether at least a part of the bucket 6 is located on the revolving structure 2 including the cab 3. The calculation unit 40 and the output unit 41 that outputs a control signal for controlling the operation of the flow rate control valve 25 based on the calculation result of the calculation unit 40 are included. As shown in FIG. 1, the right offset solenoid proportional valve 37 electrically connected to the output portion 41 has a pilot oil supply conduit 4 on the inlet side.
2 and the outlet side is the right offset pilot line 4
3 via a shuttle valve 44. The left offset electromagnetic proportional valve 38 is connected to the pilot oil supply pipe 42 on the inlet side and is connected to the left offset pilot pipe 45 on the outlet side via another shuttle valve 46. Further, the controller 36 includes a boom raising electromagnetic proportional pressure reducing valve 47 and an arm pulling electromagnetic proportional pressure reducing valve 4.
8, the arm pushing solenoid proportional valve 49, and the left offset solenoid proportional pressure reducing valve 50 are also electrically connected.

Further, in this embodiment, the operation buttons 34a,
Separately from 34b, a foot-operated operation pedal 16 for operating the offset cylinder 9 is installed in parallel, and a foot-operated accelerator pedal 17 for accelerating the operation of the offset cylinder 9 and the like is also installed in parallel in the vicinity of the foot-operated operation pedal 16. ing.

In the first embodiment constructed as described above, when the operator holds the right operation lever 12 with his right hand and appropriately operates it in the front-rear direction or the left-right direction, the boom cylinder 8 or the bucket cylinder 11 is operated in accordance with the operation amount. Operate. By pressing the right operation button 34a with the right finger, the right offset operation signal from the operation button 34a is input to the input unit 39 of the controller 36 and the angle signals from the angle sensors 35a to 35c are input. Then, in the controller 36, the calculation unit 40 calculates the coordinate position of the work machine 7 and determines whether at least a part of the bucket 6 is located on the revolving structure 2. When a part is not located on the revolving structure 2, the output unit 41 outputs a normal control signal. Along with this, since the right offset solenoid proportional valve 37 is fully opened, the pressure of the pilot oil passing through the right offset solenoid proportional valve 37 is FUL as shown by the broken line P1 in FIG.
The pilot oil rises to the L level and the shuttle valve 44
And to the offset flow control valve 25 via the right offset pilot conduit 43. As a result, the flow rate control valve 25 moves to the rightward moving end in FIG. 1, so that the offset cylinder 9 extends at the normal speed to perform the right offset operation.

On the other hand, when at least a part of the bucket 6 is located on the revolving structure 2, a control signal for deceleration is output from the output section 41, and the right offset control signal is output based on the deceleration control signal. Since the solenoid proportional valve 37 is opened halfway, as shown by the solid line P2 in FIG.
The pressure of the pilot oil passing through increases to an intermediate level, and the pilot oil is supplied to the offset flow control valve 25 via the shuttle valve 44 and the right offset pilot conduit 43. As a result, since the flow rate control valve 25 moves to the intermediate position in the right direction in FIG. 1, the flow rate of the hydraulic oil supplied from the flow rate control valve 25 to the offset cylinder 9 becomes smaller than the predetermined amount, and the offset cylinder 9 Is extended and the right offset operation is performed at the speed during deceleration. The same applies when the left operation button 34b is pressed with the right finger.

When the offset operation pedal 16 is depressed to perform the right offset operation, a pilot pressure signal corresponding to the operation amount is transmitted from the offset control pilot valve 30 through the shuttle valve 44 and the right offset pilot conduit 43. Is supplied to the offset flow control valve 25,
The amount of pressure oil supplied to the offset cylinder 9 is controlled based on the pilot pressure signal. Similarly, when the left offset operation is performed with the operation pedal 16, a pilot pressure signal corresponding to the operation amount is output from the offset control pilot valve 30 via the shuttle valve 46 and the left offset pilot conduit 45. 25, and the supply amount of the pressure oil supplied to the offset cylinder 9 is controlled based on the pilot pressure signal.

In the above-described embodiment, the stepping operation of the operation pedal 16 is not always necessary during the offset operation, and the operation buttons 34a, 34a provided on the grip portion 12a of the right operation lever 12,
Since the pressing operation of 34b is sufficient, the operator sitting on the seat 3a can easily perform the offset operation in a stable posture while supporting the body with both feet, and the controller 36
Control automatically adjusts the flow rate of the hydraulic oil supplied to the offset cylinder 9 according to the posture of the work machine 7, and when at least a part of the bucket 6 is located on the revolving structure 2, the offset cylinder 9 The operating speed of can be decelerated than usual. Therefore, when a small turning posture in which the working machine 7 is pulled toward you and held is taken, the shock of starting and stopping the offset operation of the boom 4 is reduced, and the bucket 6
It is possible to prevent a load such as earth and sand from spilling from the ground and falling onto the revolving structure 2 including the operator's cab 3. On the other hand, when the work implement 7 is extended forward, the offset operation of the boom 4 becomes quick, and the boom 4 The offset work can be efficiently performed.

Further, in the above embodiment, the accelerator pedal 1
When performing offset operation while stepping on 7,
Since the operation buttons 34a and 34b can be pressed by hand, it is not necessary to switch the offset operation pedal 16 and the accelerator pedal 17, and the operability can be improved from this point as well. Further, since the accelerator pedal 17 for accelerating the operation of the offset cylinder 9 and the like is provided in parallel, the fine operation and the normal operation of the offset cylinder 9 can be selectively used according to the work content.

FIG. 5 is a hydraulic circuit diagram of a hydraulic excavator having a working machine operating device for a hydraulic construction machine according to a second embodiment of the present invention, and FIG. 6 is a flowchart showing a processing procedure of the working machine operating device of FIG. The same reference numerals are given to the portions corresponding to those in FIGS. 1 to 4, 7 and 8 described above.

The working machine operating device according to the second embodiment is provided with a pressure sensor 35d as a load detecting means for detecting the load applied to the working machine 7, as compared with the working machine operating device of the first embodiment described above. And the calculation unit 40 calculates the pressure in the bottom side oil chamber 8a of the boom cylinder 8 based on the output signal from the pressure sensor 35d, calculates the load applied to the working machine 7, and sets the preset load. It is mainly different from the point that it is determined whether or not it is larger, and other configurations are basically the same.

The pressure sensor 35d is provided between the boom flow control valve 23 and the bottom side oil chamber 8a of the boom cylinder 8 and detects the pressure in the bottom side oil chamber 8a.

In the second embodiment as described above, the offset cylinder 9 is operated according to the processing procedure shown in FIG. That is, first, in step S1, the operator presses the right operation button 34a with the right finger, whereby the right offset operation signal from the operation button 34a and the angle signals from the angle sensors 35a to 35c are input to the input unit of the controller 36. 39, and the calculation unit 40 calculates the coordinate position of the work machine 7 and determines whether at least a part of the bucket 6 is located on the revolving structure 2 including the cab 3. At this time, when it is determined that at least a part of the bucket 6 is located on the revolving structure 2 and the work implement 7 is in the small revolving posture, the procedure proceeds to the following step S2, and the boom cylinder based on the pressure signal from the pressure sensor 35d. Bottom side oil chamber 8a
Is higher than a specified value, that is, whether the load applied to the working machine 7 is larger than a predetermined load. As a result, when it is determined that the load applied to the working machine 7 is relatively large, the process proceeds to the subsequent step S3, and the control signal at the time of deceleration for setting the pilot pressure low is output from the output unit 41, and the control at the time of this deceleration is performed. Since the right offset solenoid proportional valve 37 opens halfway based on the signal, the pressure of the pilot oil passing through the right offset solenoid proportional valve 37 rises to an intermediate level as shown by the solid line P2 in FIG. Shuttle valve 44 and right offset pilot line 4
3 is supplied to the offset flow control valve 25.
As a result, the flow rate control valve 25 moves to the intermediate position in the right direction in FIG. 5, so that the flow rate of the hydraulic oil supplied from the flow rate control valve 25 to the offset cylinder 9 becomes smaller than the predetermined amount, and the offset cylinder 9 moves. The extension and right offset operation is performed at the speed during deceleration.

On the other hand, when it is determined in step S1 that at least a part of the bucket 6 is not located on the revolving structure 2 and the work implement 7 is not in the small swing posture, the process proceeds to step S4 and the pilot pressure is increased. Outputs the control signal for normal setting
Output from 1. Along with this, the right offset solenoid proportional valve 37 is fully opened, so that the pressure of the pilot oil passing through the right offset solenoid proportional valve 37 rises to the FULL level as shown by the broken line P1 in FIG. Is the shuttle valve 44 and the right offset pilot line 43
And is supplied to the offset flow control valve 25 via. As a result, the flow control valve 25 moves to the moving end in the right direction in FIG. 5, so that the offset cylinder 9 extends at the normal speed to perform the right offset operation. Also, when it is determined in step S2 that the load applied to the work implement 7 is not larger than the specified value, the process proceeds to step S4. Further, even when the left operation button 34b is pressed with the right finger, the offset cylinder 9 is operated in the same procedure.

In the second embodiment constructed as described above, in addition to the same effects as the first embodiment described above, the hydraulic oil supplied to the offset cylinder 9 even when the load applied to the working machine 7 is applied. Since the flow rate is automatically adjusted, the operating speed of the offset cylinder 9 can be reduced when the working machine 7 is under load compared to the normal speed. Therefore, the load does not spill from the bucket 6, and the fine operation of the suspended load is easy. From this point as well, the operability of the attachments such as the offset can be improved, and when the bucket 6 is in an empty state, the boom 4 can be operated.
Since the offset operation of is fast, the offset work of the boom 4 can be performed more efficiently.

[0038]

As described above, according to the present invention,
It is not necessary to step on the operation pedal when operating attachments such as offsets equipped on the work machine, and the operator can easily operate the switch operation button with a hand that holds the operation lever while maintaining a stable posture. Since the flow rate of the hydraulic oil supplied to the actuator is automatically adjusted according to the posture of the working machine, the operating speed of the actuator can be reduced compared to the normal time when the working machine is in the small turning posture. Therefore, the operability of the attachments provided in the work machine can be improved, and the attachments can quickly operate in the work posture in which the work machine is extended forward, so that the attachments can be efficiently operated.

According to the load applied to the working machine, a load detecting means for detecting the load applied to the working machine is provided, and the actuator is controlled based on the output signals from the switch, the posture detecting means and the load detecting means. However, since the operation of the actuator can be slowed down compared to normal operation, not only can the load be prevented from spilling, but the fine operation of the suspended load is facilitated. In an unloaded state, work using attachments can be performed quickly.

Further, by providing an electromagnetic proportional valve which opens and closes in response to a control signal from the controller in the pilot line for guiding the pilot oil to the actuator flow control valve operated by the switch, the pilot control circuit is constructed. It can be applied to equipped hydraulic construction machines.

Further, when a foot-operated operation pedal is provided in parallel with the switch, the attachments can be operated by selectively operating either one of the switch and the foot-operated operation pedal, so that it can be used for various work machines. Can respond.

Further, when a foot-operated accelerator pedal for accelerating the actuator operated by the switch is provided in parallel, the operation speed of the attachments can be selected by selectively operating the foot-operated accelerator pedal, so that a fine operation can be performed according to the work content. And high-speed operation can be used properly.

When the actuator operated by the switch is an offset cylinder, a part of the working machine can be laterally moved by operating the switch, and the invention is applied to a small swing hydraulic excavator having an offset cylinder. Can be achieved.

[Brief description of drawings]

FIG. 1 is a hydraulic circuit diagram of a hydraulic excavator including a work implement operating device for a hydraulic construction machine according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing the overall configuration of the work machine operating device of FIG.

FIG. 3 is an explanatory view of the inside of a cab of the hydraulic excavator.

4 is a characteristic diagram illustrating a correlation between an operating state of an operation button provided in the work implement operating device of FIG. 1 and a control pilot pressure.

FIG. 5 is a hydraulic circuit diagram of a hydraulic excavator including a work implement operating device for a hydraulic construction machine according to a second embodiment of the present invention.

6 is a flowchart showing a processing procedure of the work machine operating device of FIG.

FIG. 7 is a side view showing the overall configuration of a conventional hydraulic excavator.

FIG. 8 is an explanatory view of the inside of a cab of the hydraulic excavator.

[Explanation of symbols]

 3a Seat 8 Boom cylinder 9 Offset cylinder 11 Bucket cylinder 12 Operating lever 12a Grip part 16 Foot-operated operation pedal 17 Foot-operated accelerator pedal 23-26 Flow control valve 34a, 34b Operation button 35a-35c Angle sensor 35d Pressure sensor 36 Controller 37, 38 Electromagnetic proportional valve 39 Input section 40 Computing section 41 Output section 43 Right offset pilot line 44 Shuttle valve 45 Left offset pilot line 46 Shuttle valve

Front page continuation (72) Inventor Toshiaki Nishida 650 Kazutachi-cho, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd. Tsuchiura factory (72) Inventor Hiroyuki Adachi 650 Jinrachi-cho, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd. Tsuchiura factory (72) Inventor Masakazu Haga 650 Jincho-cho, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd. (72) Inventor, Kazuhiro Shibamori, 650 Kintatemachi, Tsuchiura City, Ibaraki Prefecture

Claims (6)

[Claims] 1. A main body having a driver's cab, a working machine rotatably provided on a side of the driver's cab of the main body, and a plurality of actuators for respectively driving respective members constituting the working machine. A working machine operating device for a hydraulic construction machine, comprising: a plurality of flow rate control valves that respectively control the flow rates of hydraulic oil supplied to these actuators; and an operating lever that operates at least one of the plurality of actuators. , A button-type switch that is arranged at the grip of the operating lever and operates other actuators,
Attitude detection means for detecting the attitude of the working machine, and a controller for controlling the operation of the actuator flow control valve operated by the switch are provided, based on each output signal from the switch and the attitude detection means, A work machine operating device for a hydraulic construction machine, wherein a control signal is output from a controller to the flow control valve. 2. The control according to claim 1, further comprising load detecting means for detecting a load applied to the working machine, wherein the controller controls the output signals from the switch, the posture detecting means and the load detecting means. A working machine operating device for a hydraulic construction machine, which is characterized by outputting a signal. 3. The electromagnetic proportional valve that operates according to a control signal from the controller, in the pilot line for guiding pilot oil to the actuator flow control valve operated by the switch, according to claim 1. A work machine operating device for a hydraulic construction machine characterized by being interposed. 4. A foot-operated operation pedal is provided separately from the switch according to claim 1, and the same operation is performed by selectively operating one of the switch and the foot-operated operation pedal. A working machine operating device for a hydraulic construction machine, characterized in that an actuator is operated. 5. The working machine operation for a hydraulic construction machine according to claim 1, wherein a foot-operated accelerator pedal for accelerating the operation of the actuator operated by the switch is provided in parallel. apparatus. 6. The working machine operating device for a hydraulic construction machine according to claim 1, wherein the actuator operated by the switch is an offset cylinder.