JPH0430035A - Operation quantity control device for construction machine - Google Patents

Abstract

PURPOSE:To improve the working efficiency by changing an operation quantity setting means, for setting a control valve open degree command freely against an operation position detected value of an operating lever, in response to a setting selecting means and an operation direction judge means. CONSTITUTION:Multiple characteristic patterns for outputting an open degree command of a control valve 28 against operation quantity (angle theta, theta ') of an operating lever 19 are stored in a memory 23 of a controller 21 previously. A selecting switch 20 as a setting selecting means for selecting an open degree command of the control valve 28 is provided in the controller 21, and the selecting signal from the selecting switch 20 is input to the controller 21, and the control valve open degree command signal corresponding to an operation quantity of the operating lever 19 is output to the control valve 28. The speed of an arm cylinder 8' at the time of return operation of a working machine is increased on the basis of the operation direction of the operating lever 19.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Use in Work The present invention relates to a control amount limiting device for a work control lever installed in a construction machine such as a hydraulic excavator.

BACKGROUND OF THE INVENTION FIG. 4 is a side view of a hydraulic excavator. In Figure G, 1 is the lower traveling body of the hydraulic excavator, 2 is the upper revolving body,
3 is a working machine attached to the front part of the upper revolving structure 2, 4 is the boom of the working machine 3, 5 is an arm 6, which is a slope packet which is a working tool, 7 is a boom cylinder, 8 is an arm cylinder,
9 is a packet cylinder, and A is a slope that is being straightened and finished.

FIG. 5 is a block diagram showing an example of a conventional control device installed in a hydraulic excavator.

In the figure, 10 is an engine, 11 is a governor device for the engine 1O, 12 is a rotation sensor that detects the rotation speed of the engine 10, 13 is a variable pump, 14 is a servo mechanism of the variable pump 13, and 8 is a working machine 3 of a hydraulic excavator. 15 is a control valve for arm cylinder 8;
6 is a controller, and 17 is a work mode changeover switch.

Next, the configuration of the conventional control device will be described with reference to FIG. I am trying to output it.

Next, the functions of the conventional control device will be described.

Hydraulic excavators come in H (for heavy loads), S (for normal loads), and FC, allowing you to choose the amount of work and fuel efficiency depending on the work involved.
Some models allow users to select one of several types of work modes, such as (for micro-speed operation). FIG. 6 is a pump horsepower control curve diagram of the variable pump 13. The operator can select to change the pump horsepower by operating the work mode changeover switch 17 in accordance with the size of the work load. Also, FIG. 7 shows H,
It is a performance curve diagram of the engine 10 in S, FC mode.

As mentioned above, the hydraulic excavator's work mode can be selected and operated, so when performing work that requires fine movements, such as leveling slopes or lifting loads, the operator can switch the work mode selector switch. 17 to the FC (for micro speed operation) position.

As a result, the rotational speed of the engine (10) is reduced, so that the operating speed of the arm cylinder 8 is slowed down, allowing accurate fine operation to be performed at low speed.

Problems to be Solved by the Invention When the work of the hydraulic excavator is detailed and requires slow and accurate movement, the operator sets the work mode changeover switch to the FC mode position for micro speed operation. Here, we will discuss, for example, a case where slope surface adjustment is performed. When the slope packet completes the slope cutting operation and moves the slope packet to the next slope cutting start position, the moving speed is very slow, which hinders work efficiency. Since the work mode changeover switch is not a switch for operation during driving, the driver has to interrupt work and operate the changeover switch. In other words, the driver cannot operate the changeover switch while driving.

This invention solves the above-mentioned problem, and controls the opening degree of the spool opening of the control valve with respect to the operation direction of the control lever, thereby enabling the operation of construction machinery to perform quick return operation of the work machine during minute speed operation. The object of the present invention is to provide a quantity control device.

Means for Solving the Problems The means of the present invention taken to solve the above problems are as follows: (1) A detection means for detecting the operating position of the work operating lever, and each of the working machines corresponding to the detected value. In a construction machine each equipped with a control valve for controlling a hydraulic cylinder, an operation amount setting means for setting an arbitrary control valve opening command in response to a detected operation position of the operation lever is provided.
It is configured to change according to the setting selection means and the operation direction determination means.

Function A1 A plurality of types of characteristic patterns for outputting commands for control valve opening degree (control valve opening degree due to spool stroke) with respect to the operation amount of the work operation lever are stored in advance in the controller.

B. A selection switch is provided on the controller as a setting selection means for selecting the control valve opening command. Therefore, when a desired characteristic pattern is selected by operating the selection switch, the controller outputs a control valve opening command signal corresponding to the operating amount of the operating lever to the control valve.

C. In the case of item 4 above, the control valve opening command signal corresponding to the amount of operation of the operation lever is sent from the controller to the control valve according to the switched characteristic pattern based on the operation direction of the operation lever during work. It is possible to increase the speed of the hydraulic cylinder during the return operation of the working machine. Therefore, the work machine can perform work operations at low speed and still perform quick return operations.

Embodiments Hereinafter, embodiments of the present invention will be described in detail based on the drawings. FIG. 1 is a block diagram showing a manipulated variable control device according to the present invention. In the figure, 18 is an electric joystick, 19 is an operating lever of the electric joystick 18, and F and R are operating levers that are operated in the front and rear operating directions, respectively, and the left and right operating directions of the operating lever 19, respectively. ), the angles θ and θ' are the operating lever 18
20 is a selection switch, 21 is a controller, 22 is a central processing unit of the controller 21, 23 is a memory, 24 is an A/D converter, 25 is a digital input unit, and 26 is a D /A converter, 27 is a drive driver, 28 is an electro-hydraulic control valve, and 8'' is an arm cylinder as a representative example of each hydraulic cylinder installed in a hydraulic excavator working machine (not shown).

Figures 2 and 3 show the control valve opening α
It is a chart showing characteristic patterns A and B of.

Next, the configuration of the manipulated variable control device according to the present invention will be described with reference to FIGS. 1 to 3. The operation amount setting means for setting an arbitrary control valve opening command for the operation position detection value (detection value corresponding to the operation amount θ, θ') of the operation lever 19 of the electric joystick 18 is used as a setting selection means and operation direction discrimination. It is configured to change depending on the means.

Next, the functions of the manipulated variable control device according to the present invention will be described. Operation amount of the operating lever 19 (angle θ, θ゛)
The complex characteristic patterns A and B for outputting the control valve opening degree α (opening angle of the control valve 28 due to the spool stroke (not shown)) command are as follows:
It is stored in the memory 23 of the controller 21 in advance.

Further, a selection switch 2° is provided on the controller 21 as a setting selection means for selecting a control valve opening command. Therefore, when a desired characteristic pattern is selected by operating the selection switch 20, the selection switch 2
A selection signal from 0 is input to the controller 21. Based on the selection signal, the controller 21 outputs a control valve opening command signal corresponding to the amount of operation of the operating lever 19 to the control valve 28. In this case, the control valve opening command signal is sent from the controller 21 to the control valve 28 in accordance with the switched characteristic pattern based on the operating direction of the operating lever 19 during work (direction F or R in FIG. 1). is output to. Thereby, the speed of the arm cylinder 8' can be increased during the return operation of the working machine.

As a specific example of the above settings, a case of slope leveling work using a hydraulic excavator will be described. As operation settings for the arm of the working machine, the memory 23 of the codon roller 21 stores a characteristic pattern A similar to a normal standard work mode and a characteristic pattern B in which the fine operation range is expanded. Therefore, characteristic pattern A is obtained by arm pushing operation (operating lever 19 is operated in direction F), and arm pulling operation (
When a work operation mode in which characteristic pattern B is exhibited is selected using the selection switch 20 (the operation lever 19 is operated in the R direction), the slope is leveled only by the arm pull operation, and the slope is leveled by the arm push operation. Now you can perform the return movement of the arm.

Since the speed of the return movement of the arm is fast, slope finishing work can be carried out easily and quickly.

In addition, for work other than the above-mentioned slope leveling work, such as when you want to perform continuous fine control only by pulling the arm, the reverse arm pushing operation can be performed at the normal high speed, making the work more efficient and improving work efficiency. will improve. In contrast to the above case, if a fine operation is to be performed only by pushing the arm, it is better to select the above settings and the operation direction determination of the operation lever 19 that is reversed.

In the above embodiment of the present invention, the control valve opening command is outputted to the central processing unit 22 of the controller 21 by digital value input, but the selection signal from the selection switch is inputted as an analog value, e.g. The output setting of the control valve opening command can also be made variable by using a trimmer resistor or the like.

Effects of the Invention In the operation amount limiting device according to the present invention, the operation amount setting means for setting an arbitrary control valve opening degree command with respect to the operation position detection value of the operation lever of the electric joystick is provided.
It is made to change according to the setting selection means and the operation direction determination means. Additionally, it is possible to select a so-called quick return mode in which the work equipment, such as the arm or boom, is operated in one direction by fine control, and the work equipment moves at a high speed in the opposite direction. Furthermore, the quick return mode can be determined and switched depending on the operating direction of the operating lever.

Therefore, in a construction machine equipped with the manipulated variable control device according to the present invention, a so-called quick return mode can be selected, so that the cycle time of fine operation work such as slope leveling can be shortened, and the workability and work efficiency can be improved. let

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a manipulated variable control device according to the present invention, FIGS. 2 and 3 are charts showing characteristic patterns A and B of control valve opening, respectively, and FIG. 4 is a side view of a hydraulic excavator. FIG. 5 is a block diagram showing an embodiment of a conventional control device, FIG. 6 is a pump horsepower control curve diagram of a variable pump, and FIG. 7 is an engine performance curve diagram in H, S, and FC modes. 3--------------------Working machine 8, 8
' ---Arm cylinder 15.28--Control valve 16.21--Controller 17-------Work mode changeover switch 18--111 -------Electric joystick 19------One operation lever 20-
------------ One selection switch 23 --------
−−−−−−Memory or more

Claims (1)

[Claims] (1) Detection of the operating position of the operating lever in a construction machine equipped with a detection means for detecting the operating position of the operating operating lever and a control valve that controls each hydraulic cylinder of the working machine in accordance with the detected value. 1. An operation amount control device for construction machinery, characterized in that an operation amount setting means for setting an arbitrary control valve opening degree command for a value is configured to be changed in accordance with a setting selection means and an operation direction determining means.