JP2583127B2 - Hydraulic excavator traveling / work equipment operating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention controls the switching of a plurality of electric control operation valves in accordance with an input signal from a controller so that the discharge oil of a plurality of hydraulic pumps is applied to each actuator of a hydraulic excavator. The present invention relates to an operating device that is adapted to selectively inflow to improve the traveling of a hydraulic excavator and the operability and workability of a working machine.

[Conventional technology]

2. Description of the Related Art Conventionally, in a hydraulic excavator, a plurality of hydraulic pumps are usually provided for distributing parlows when hydraulically driving a traveling / working machine and a turning machine. An example of a control circuit for actuators such as a left and right traveling motor, a working machine, and a swing by the basic hydraulic pump system will be described with reference to FIG. The hydraulic circuit 3 of the hydraulic pump 2 driven by the engine 1 includes a bucket cylinder 6, a left traveling motor 7, a boom cylinder 8, a swing motor 9, and an arm cylinder 10. The hydraulic circuit 5 of the hydraulic pump 4 includes a bucket cylinder 6. , Left running motor 7, boom cylinder 8, right running motor 11,
Each actuator of the arm cylinder 10 is connected via an electric control operation valve (not shown). A command to an electric control operation valve (not shown) for operating the actuator is given by a travel operation lever 13 composed of an electric lever, a bucket
The amount of operation change of the boom operation lever 14 and the arm / slewing operation lever 15 is converted into an electric signal, transmitted to the controller 16, and transmitted as an output signal from the controller. When the separation mode switch 17 is set to the standard mode, the discharge oils of the two hydraulic pumps 2 and 4 singly or merge into the actuator according to the operation amount of the operation lever, and the boom cylinder 8. Two pumps of discharge oil are allowed to flow into the arm cylinder 10 to make the working speed appropriate. When the separation mode, for example, the separation mode switch 17 is set to the traveling / working machine separation mode, an independent circuit is formed for the left and right traveling motors when the traveling alone is operated, and the left traveling motor 7 is driven by the discharge hydraulic pressure of the hydraulic pump 2.
The right traveling motor 11 is driven by the discharge hydraulic pressure of the hydraulic pump 4. When the traveling and working machines are simultaneously operated, the left and right traveling motors 7 and 11 are driven by the discharge hydraulic pressure of the hydraulic pump 4, and the work machine actuator (any of 6, 8, 9 and 10) is driven by the discharge hydraulic pressure of the hydraulic pump 2. By separating the pump circuits 3 and 5, speed interference with the work machine actuator is prevented.

[Problems to be solved by the invention]

However, as described above, in the two hydraulic pump systems, when the work is performed in the separation mode, the operability of the work machine is improved and the speed interference with the work machine actuator can be prevented as compared with the standard mode. However, the amount of oil discharged from the pumps that operate the individual actuators is reduced to half because only one pump is used, and when the amount of oil required for two pumps is required independently, for example, the running / work equipment separation mode is set. In the case of traveling alone during suspension work, the boom / arm separation mode is set. When the arm is returned during clearance work, the operation speed is slow because of the separation mode, and the work efficiency is not improved. The present invention pays attention to the above problem, and sets the separation mode in the work content where operability is important, and when the work speed alone becomes necessary during the work, temporarily releases the separation mode, It is an object of the present invention to provide an operation control device for a traveling / working machine, which serves as a hydraulic circuit for causing a discharge oil amount of the two pumps to flow into a traveling motor or a working machine actuator.

[Means for solving the problem]

In order to achieve the above object, a traveling / working machine operation device for a hydraulic excavator according to the present invention includes two hydraulic pumps driven by an engine, and a traveling device that receives hydraulic oil discharged from the two hydraulic pumps. Actuators for driving work machines such as swing, boom, arm, bucket, etc., each flow control valve for supplying and discharging pressure oil to and from these actuators, and selecting to merge or split pressure oil discharged from two hydraulic pumps The hydraulic excavator traveling / working machine operating device, comprising: a selecting means for performing the operation, and an operating lever for outputting a command signal to each flow control valve to switch the direction of the pressure oil from the hydraulic pump to each actuator. Pilot check valves 23 and 25 connected between the hydraulic pump 2 and the second hydraulic pump 4 and the head chamber 10a of the actuator 10;
Hydraulic pump 2 and second hydraulic pump 4 and actuator
10 having respective pilot check valves 26 and 28 connected between the bottom chamber 10b and the bottom chamber 10b.
0b, one of the pilot check valves 23, 25, 26, 28 is shut off, and a separation mode switch 17 for inputting a command signal for shunting to the controller 16 and a predetermined operation lever 14, 15 are attached to the In addition, while operating the predetermined operation levers 14, 15, the ON operation of the separation mode is released, and the pilot check valves 23, 25, 26, 28 of the head chamber 10a and the bottom chamber 10b of the actuator 10 are operated. And a separation mode release switch 17 for inputting a command signal to be merged into the controller 16.

[Action]

According to the above configuration, when the operation content emphasizes the operability, the separation mode is set when the operation mode is set to the separation mode. Simply press to return to the standard mode two pump system and double the working speed of each actuator.

〔Example〕

Hereinafter, an embodiment of an operation control device for a hydraulic excavator working machine according to the present invention will be described with reference to the drawings. FIG. 1 is an operation control circuit diagram of a hydraulic excavator and a traveling / working machine based on an embodiment of the present invention, and FIG.
FIG. 3 shows an operation control circuit diagram of an arm cylinder portion. The hydraulic circuit 3 of the variable displacement hydraulic pump 2 driven by the engine 1 includes a bucket cylinder 6, a left running motor 7, a boom cylinder 8, a swing motor 9, an arm cylinder 10
However, a bucket cylinder 6, a left traveling motor 7, a boom cylinder 8, a right traveling motor 11, and an arm cylinder 10 are connected to a hydraulic circuit 5 of the variable displacement hydraulic cylinder 4 via an electric control operation valve 12. The electric control operation valve 12 for operating these actuators includes a traveling operation lever 13 composed of an electric lever, a bucket / boom operation lever.
14. An operation change amount of the arm / swing operation lever 15 is converted into an electric signal and transmitted to the controller 16, which is transmitted in the form of an output signal from the controller. FIG. 2 is an electric control operating valve and an electro-hydraulic circuit diagram relating to the arm cylinder 10, and the operation will be described based on this drawing.
Set the separation mode switch 17 to the standard mode, and
When the swing operation lever 15 is operated so that the arm dumps, the operation change amount of the operation lever is converted into an electric signal and transmitted to the controller 16, and an input signal is input from the controller 16 to the pilot valves 19 and 20. The pilot check valves 23, 24 and 25, 24 on the meter-out side are opened, and the discharge oil from the variable displacement hydraulic pumps 2, 4 flows into the head side chamber 10a of the arm cylinder 10, and moves the arm in the dump direction. Conversely, when the arm is excavated, an input signal is input from the controller 16 to the pilot valves 21 and 22, and the pilot check valves 26, 27 and 28, 27 on the meter-in side and the meter-out side are opened. Discharge oil flows into the bottom side chamber 10b of the arm cylinder 10,
Move the arm in the direction of excavation. Set the separation mode switch 17 to
For example, with the boom / arm separation mode set,
When the arm is operated to dump the operation lever in the same manner as described above, even if the electric signal by the lever operation transmitted to the controller 16 is the same as described above, since the separation mode is set, the input signal from the controller 16 is a pilot signal. Only sent to valve 20. As a result, the pilot check valves 25 and 24 on the meter-in side and the meter-out side are opened, and only the discharge oil of the variable displacement pump 4 flows into the head side chamber 10a of the arm cylinder 10. That is, when the boom / arm separation mode is set, both pumps are set so that only the discharge oil of the variable displacement hydraulic pump 2 flows into the boom cylinder 8 and only the discharge oil of the variable displacement hydraulic pump 4 flows into the arm cylinder 10. By separating the hydraulic circuits 3 and 5 of
Even if the load pressures of the actuators are different, if the two hydraulic pumps are divided, there is no influence such as a decrease in the speed of each actuator. In addition to the boom and arm separation modes, the separation mode includes traveling, a working machine separation mode (the pump 2 is for the working machine, and the pump 4 is a left and right traveling motor), turning, and a working machine separation mode (the pump 2 is a turning motor). And the pump 4 is for a working machine). In the separation mode, even if the load pressure of each actuator is different at the time of the combined operation, the two hydraulic pumps are divided so that there is no influence such as a decrease in the speed of each actuator. In the case where it is desirable to increase the working speed, for example, at the time of hanging work (running-working machine separation mode),
When moving while hanging, or when clearing work (boom / arm separation mode) and returning only the arm without moving the boom, the higher the working speed, the higher the efficiency. Mode release switch 18
When the button is pressed, the separation mode switch 17 is
Signal is canceled, the input signal output from the controller 16 to the electric control operation valve becomes the same as in the standard mode, the discharge oils of the two hydraulic pumps 2 and 4 join and flow into the actuator, Work speed can be increased.

〔The invention's effect〕

As described above, according to the traveling / working machine operating device of the hydraulic excavator of the present invention, the separation mode release switch is provided to each operation lever for switching the direction of the pressure oil from the hydraulic pump to each actuator in a hydraulic excavator operation. Was added,
When it is desired to increase the drive speed of the actuator operated by each operation lever, the two hydraulic pumps can be joined by pressing the separation mode release switch. By operating the attached separation release switch, a predetermined actuator speed can be obtained, so that workability is improved.

[Brief description of the drawings]

FIG. 1 shows a hydraulic excavator according to an embodiment of the present invention,
FIG. 2 is an operation control circuit diagram of the arm cylinder portion in FIG. 1, and FIG. 3 is an operation control circuit diagram of a hydraulic excavator and a traveling / working machine based on the prior art. . 2,4 ... variable displacement hydraulic pump 3,5 ... hydraulic circuit, 6 ... bucket cylinder 7 ... left running motor, 8 ... boom cylinder 9 ... slewing motor, 10 ... arm cylinder 11 ... right Traveling motor, 12 Electric control operating valve 13 Traveling operating lever 14 Bucket / boom operating lever 15 Arm / slewing operating lever 16 Controller 17 Separation mode switch 18 Separation mode release switch 19 , 20,21,22 …… Pilot valve 23-28 …… Pilot check valve

Claims (1)

(57) [Claims] 1. Two hydraulic pumps driven by an engine, and respective actuators that drive working machines such as a traveling, turning, boom, arm, and bucket by receiving pressure oil discharged from the two hydraulic pumps; Flow rate control valves for supplying and discharging pressure oil to and from each actuator, selecting means for selecting whether to merge or split pressure oil discharged from the two hydraulic pumps, and outputting a command signal to each flow rate control valve to allow each actuator from the hydraulic pump And a head for the first hydraulic pump (2), the second hydraulic pump (4), and the actuator (10). Pilot check valves (23, 25) connected between the first hydraulic pump (2), the second hydraulic pump (4) and the actuator (10). And a pilot check valve (26, 28) connected between the head chamber (10a) and the bottom chamber (10b) of all the actuators (10). ), Shuts off one of the pilot check valves (23, 25, 26, 28) and sends a command signal to shunt the controller (16).
The separation mode switch (17) for inputting to the input and the predetermined operation lever (14, 15)
4, 15) and release the ON operation of the separation mode, and the pilot check valves (23, 23) of the head chamber (10a) and the bottom chamber (10b) of the actuator (10).
25. A traveling hydraulic excavator, comprising: a separation mode canceling switch (17) for connecting the operated one of 25, 26, 28) to the controller (16) to input a command signal to be joined to the controller (16).・ Work equipment operating device.