JPH09256414A - 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 makes judgement as to whether a load acting on a work machine exceeds the preset value, on the basis of output signals from the operation buttons 34a and 34b, and a pressure sensor 35. When the load on the work machine calculated at a low level is found equal to or below the preset value, 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 a load calculated at a high level exceeds the preset value, a decleratoin 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 small swing hydraulic excavator having an offset mechanism, a spill of a bucket is prevented when the working posture is changed from a working posture in which the working implement is extended forward to a small swing posture in which the working implement is pulled toward you and held. However, since it is necessary to perform an offset operation, the two operating levers are operated with both hands to perform turning, boom raising, arm pulling, and horizontal holding of the bucket, and at the same time, an offset operation is performed by depressing the operating pedal. It has become.

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. 5 is a side view showing the overall construction of a conventional hydraulic excavator, and FIG. 6 is an explanatory view of the inside of the cab of the hydraulic excavator.

In FIG. 5, 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. 6, 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 operator's cab 3 will interfere with each other when the working posture of the working implement 7 extended from the front 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, simply turn on the switch when operating it.
・ Because only the OFF signal is output, this ON / OFF
It is not possible to adjust the operating speed of the actuator that operates according to the signal.For example, if the offset cylinder is operated with a button-type switch, even when the bucket of the work machine is full of earth and sand or during lifting work. Boom offset operation is performed at full speed, and there is concern about malfunctions such as load spillage due to start and stop shocks at that time.

Therefore, in the present invention, in addition to the above configuration,
A load detecting means for detecting the load applied to the work machine and a controller for controlling the operation of the actuator flow control valve operated by the button type switch are provided, and when the operator manually presses the switch, the switch and the load are provided. A control signal is output from the controller to the flow control valve based on each output signal from the detection means. For example,
When the load applied to the work machine is less than or equal to a predetermined value, 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, when the load applied to the work machine is larger than the predetermined value, the controller outputs a control signal during deceleration, and the flow rate of the hydraulic oil supplied to the actuator based on the control signal during deceleration is set to be higher than the predetermined amount. Reduce.

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 load applied to the work machine. When the machine is loaded, the operating speed of the actuator can be slowed down compared to the normal speed. Therefore, the operability of the attachments provided in the work machine can be improved, and the attachments quickly operate when the work machine is not loaded, so that 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 operating lever for operating at least one of the plurality of actuators, a button type switch arranged at a grip portion of the operating lever for operating another actuator, and a load for detecting a load applied to the working machine. And a controller that outputs a control signal for controlling the operation of the flow control valve based on the output signals from the switch and the load detection means. It is the adult.

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.

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

Further, in order to correspond to 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 either 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.

The actuator operated by the switch may be any actuator that drives attachments such as a swing cylinder and a telescopic cylinder. However, 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.

[0019]

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 an embodiment of the present invention, FIG. 2 is a block diagram showing an overall configuration of the working machine operating device in FIG. 1, and FIG.
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 pressure,
FIG. 4 is an explanatory view of the inside of the cab of the hydraulic excavator, in which parts corresponding to those in FIGS. 5 and 6 are given the same reference numerals.

In FIG. 1, reference numeral 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 unillustrated engines, 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.

Each of the pilot valves 27 to 33 is interlocked with the operating levers 12 to 15 and the operating pedal 16, and, for example, when the operator holds the right operating lever 12 with his right hand and appropriately operates it in the front-rear direction, depending on the operation amount. The pilot pressure signal is supplied from the boom control pilot valve 27 to the boom flow rate 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 bucket flow control valve 24 is generated based on the pilot pressure signal output from the bucket control pilot valve 29.
The supply amount of the pressure oil supplied from the to the bucket cylinder 11 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. 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 is transmitted from the right travel control pilot valve 32, the left travel control pilot valve 33 to each travel flow control valve. 26 to the right traveling motor 1 based on the pilot pressure signal.
9. The amount of pressure oil supplied to the left travel motor 20 is controlled.

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 includes a pair of operation buttons 34a and 34b for operating the offset cylinder 9 in two opposite directions, that is, an extending direction and a contracting direction. , A pressure sensor 35 as a load detecting means for detecting a load applied to the working machine 7, and a pair of these operation buttons 34a and 34b and a pressure sensor 35.
Controller 36 to which is connected, and this controller 3
The electromagnetic proportional valves 37 and 38 are opened and closed according to the control signal output from the control unit 6. The pressure sensor 35 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 addition, the operation buttons 34a,
Reference numeral 34b is a push switch for performing an ON / OFF operation, and these operation buttons 34a and 34b are provided on the grip portion 12a of the right operation lever 12 as shown in FIG.

Further, the controller 36 inputs the output signals from the pair of operation buttons 34a and 34b and the pressure sensor 35, and the bottom side of the boom cylinder 8 based on the output signal from the pressure sensor 35. Oil chamber 8a
A calculation unit 40 for calculating the internal pressure, that is, for calculating the load applied to the working machine 7 and determining whether the load is larger than a preset load, and a flow control valve based on the calculation result of the calculation unit 40. 25, and an output unit 41 for outputting a control signal for controlling the operation of No. 25. As shown in FIG. 1, the right offset solenoid proportional valve 37 electrically connected to the output section 41 has a shuttle valve connected to the pilot pressure supply conduit 42 on the inlet side and to the right offset pilot conduit 43 on the outlet side. It is connected via 44. In addition, the left offset solenoid proportional valve 38 has a pilot pressure supply line 4 on the inlet side.
2 is connected to the left side, and the outlet side is the left offset pilot line 4
5 via another shuttle valve 46. Further, a boom raising electromagnetic proportional pressure reducing valve 47, an arm pulling electromagnetic proportional pressure reducing valve 48, an arm pushing electromagnetic proportional pressure valve 49, and a left offset electromagnetic proportional pressure reducing valve 50 are electrically connected to the controller 36. .

In the present 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 embodiment thus constructed, when the operator grips the right operation lever 12 with the right hand and appropriately operates in the front-back or left-right direction, the boom cylinder 8 or the bucket cylinder 11 operates according to the operation amount. .
By pressing the right operation button 34a with the right finger, a right offset operation signal from the operation button 34a is input to the input section 39 of the controller 36, and
The load signal from the pressure sensor 35 is input, and in the controller 36, the calculation unit 40 calculates the pressure in the bottom side oil chamber 8a of the boom cylinder 8 to determine whether the load applied to the working machine 7 is larger than a preset load. Whether or not, for example,
When the calculated load is equal to or less than the predetermined value, the output unit 41 outputs a normal control signal. Along with this, since the right offset electromagnetic proportional valve 37 is fully opened, the pressure of the pilot pressure passing through the right offset electromagnetic proportional valve 37 rises to the FULL level as shown by the broken line P1 in FIG. Is supplied to the offset flow control valve 25 via the shuttle valve 44 and 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 the calculated load is larger than the predetermined value, the control signal at the time of deceleration is output from the output unit 41, and the right offset solenoid proportional valve 37 is half-opened based on the control signal at the time of deceleration.
As indicated by the solid line P2 in FIG. 3, the pressure of the pilot pressure that passes through the right offset solenoid proportional valve 37 rises to an intermediate level, and the pilot pressure passes through the shuttle valve 44 and the right offset pilot conduit 43 and the offset flow rate. It is supplied to the control valve 25. 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 The extension and 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-mentioned embodiment, the stepping operation of the operation pedal 16 is not always necessary at the time of the offset operation, and the operation buttons 34a provided on the grip portion 12a of the right operation lever 12 are
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
With the control described above, the flow rate of the hydraulic oil supplied to the offset cylinder 9 is automatically adjusted according to the load applied to the working machine 7, and the operating speed of the offset cylinder 9 can be reduced from the normal time when the working machine 7 is loaded. Therefore, bucket 6
It is possible to prevent the load from spilling from the outside, facilitate fine control of the suspended load, and improve the operability of attachments such as offset. Further, the offset operation of the boom 4 becomes quick when the bucket 6 is in an empty state, and the offset work of the boom 4 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. Furthermore, 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.

[0030]

As described above, according to the present invention,
There is no need to step on the operation pedal when operating attachments such as offsets equipped on the work machine, and the operator can easily operate the button-type switch 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 load applied to the work machine, the operating speed of the actuator can be reduced when the work machine is loaded compared to the normal speed. Therefore, the operability of the attachments provided in the work machine can be improved, and the attachments quickly operate when the work machine is not loaded, so that the work using the attachments can be efficiently performed.

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

If a foot-operated operation pedal is provided separately from the switch, the attachments can be operated by selectively operating either one of the switch and the foot-operated operation pedal. Can respond.

When a foot-operated accelerator pedal for accelerating the actuator operated by the switch is installed in parallel, the operation speed of the attachments can be selected by the selective operation of the foot-operated accelerator pedal. Operation and high-speed operation can be used separately.

When the actuator operated by the switch is an offset cylinder, a part of the working machine can be moved laterally by operating the switch, and the actuator 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 an embodiment of the present invention.

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

3 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. 4 is an explanatory view of the inside of a cab of the hydraulic excavator.

FIG. 5 is a side view showing the overall configuration of a conventional hydraulic excavator.

FIG. 6 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 Operation lever 12a Grip part 16 Foot-operated operation pedal 17 Foot-operated accelerator pedal 23-26 Flow control valve 34a, 34b Operation button 35 Pressure switch 36 Controller 37, 38 Electromagnetic proportional valve 39 Input unit 40 Calculation unit 41 Output unit 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 (5)

[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,
A load detecting means for detecting a load applied to the working machine, and a controller for outputting a control signal for controlling an operation of the flow control valve based on output signals from the switch and the load detecting means. A work machine operating device for hydraulic construction machinery. 2. The electromagnetic proportional valve which operates according to a control signal from the controller is provided in a pilot line for guiding pilot oil to an actuator flow control valve operated by the switch. A working machine operation device for a hydraulic construction machine characterized by the above. 3. A foot-operated operation pedal is provided separately from the switch according to claim 1, and the same actuator is operated by selectively operating one of the switch and the foot-operated operation pedal. A working machine operating device for a hydraulic construction machine, which is characterized in that 4. 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. 5. 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.