JPH0366901A - Operation valve hydraulic oil amount compensation control device - Google Patents

Abstract

PURPOSE:To improve the compound operation and the working efficiency by installing a change-over switch which can remove and set compensation of actuation oil quantity according as necessary. CONSTITUTION:Operation quantity signal generators 5a, 6a are installed on operation levers 5, 6 for a rotation driving motor 1 and a boom driving cylinder 2. Those outputs and a signal, which is set by a fuel lever 11 of an engine 10 and gained from a rotation frequency target setting device 12, are input to a control device 9 through a change-over switch 19. Then an output from a function generating means 9a of the control device 9 is input and operated in multiplication devices 9b, 9c with the signals from the operation quantity signal generators 5a, 6a. The operated output is applied to solenoids 3a, 3b, 4a, 4b to drive operation valves 3, 4 for compensation control of actuation oil quantity. The change-over switch 19 therefore can remove and set the com pensation of actuation oil quantity to improve the compound operation and the working efficiency.

Description

Detailed Description of the Invention (Industrial field for f'l) The actuator can be operated by changing the correlation between the stroke of the operating lever and the stroke of the operating valve in accordance with changes in engine speed. I tried to improve my sexuality. This article relates to a control device for operating valves.

(Conventional technique?R) As for this a#, as shown in FIG. 2 JI and FIG. A hydraulic circuit is formed in which the hydraulic fluid discharged from the hydraulic pump 7 drives the hydraulic motor 1it and the hydraulic cylinder 2, respectively, via the operating valves 3.4 of the actuator. The operation signal for making 11 strokes of the spool for 4 is calculated as shown in the figure below. Lever -
Target rotation speed setting 2 of the engine 10 set by 11
When the target rotational speed signal N, which is output from the controller 312, is input to the function generating means 13 in the control device i9 shown in FIG. Multiplier] 4 in the control device 6.

On the other hand, the operation signal X by operating the levers 5 and 6 1.
l+X, is output to the multiplication 014, the operation signal X LI+ X 1. ! The gain K is set to f! calculated,
A groove bottom is provided to output a control signal tp for the control valve 3.4.

In the above configuration, the engine IO may be set to a partial load during light load work, but in this case, the amount of hydraulic fluid discharged from the hydraulic pump 7 decreases due to a decrease in the engine rotation speed. When the hydraulic motor 1 and the hydraulic cylinder 2 are operated in a combined manner, there is a problem in that the hydraulic oil discharged from the hydraulic pump 7 tends to flow to the actuator with a light load, impairing the combined operability. Therefore, as the number of rotations of the engine decreases, that is, the amount of hydraulic oil discharged from the hydraulic pump 7, the ratio of the spool of the spool for the operating valves 3 and 4 to the amount of operation of the operating lever 5.6 increases. by reducing the amount and throttling the operating valve.

It is controlled so that the hydraulic fluid does not easily flow to the actuator with a light load.

(Question 11 to be solved by the invention) Regarding the above-mentioned conventional technology, C,! During light load work, the amount of operation of the operating levers -5 and 6 is controlled according to the engine speed (because the stroke movement of the 9-valve 3.4 spool is limited to #i, multiple actuators cannot be combined) When operating, the problem is solved that the hydraulic oil discharged from the hydraulic pump 7 easily flows to the actuator with a light load, and the combined operability can be improved.However, in the case of single operation during light load work However, since the stroke of the spool for the operating valve 3.4 is limited in response to the amount of operation of the operating lever 5.6, the actuator cannot be operated even though there is sufficient power.
- There was a problem that the machine could not be operated quickly and the efficiency of the operation was reduced.

(Means for Solving the Problems) The present invention has been made to solve the problems in the conventional technology, and the invention provides a plurality of actuators and a control valve for the actuators.

an operating lever that outputs an operating signal for controlling the operating valve; a hydraulic pump that supplies hydraulic oil to each of the actuators via the operating valve; - A hydraulic oil amount compensation control device e for an operating valve, which is provided with a means for changing the correlation between the stroke of the operating spool and the stroke of the operating valve; A second invention provides a hydraulic oil amount compensation control device for an operating valve, which is characterized in that a switching device that allows setting is provided, provides the following:
The object of the present invention is distantly related to a hydraulic fluid amount compensation control device for an operating valve, in which the operating lever 55 is a switching device that allows the hydraulic fluid amount compensation to be canceled and set as necessary.

(For fj) According to the groove bottom, even if the discharge amount of the hydraulic pump is reduced by lowering the engine rotation speed during light load 1-yah operation, the control valve for the tI fj amount of the control flf lever can be adjusted. Since the stroke rate of the spool is automatically reduced, when multiple actuators are operated in a complex manner, the hydraulic fluid discharged from the hydraulic pump 7 is loaded even if the operation lever is operated in the conventional manner. This solves the problem of the fluid flowing easily to light actuators, and it is possible to supply even high-load actuators, improving combined operability. In addition, when operating the actuator independently, if the drive source of the hydraulic pump has sufficient power, if the ratio of the stroke of the operating valve spool to the reduced stroke of the operating fjp lever is canceled, the actuator can be operated at high speed.

(Example) Hereinafter, an example in which the control device for controlling the operation valve of the present invention is applied to a hydraulic excavator will be described in detail with reference to FIG. 1 of the accompanying drawings. 1 is a swing drive motor;
2 is a boom drive cylinder; 3 and 4 are operating valves for the swing drive motor 1 and the boom drive cylinder 2; 5 and 6 are the swing drive motor 1 and boom drive cylinder 2, respectively. The control lever 7 is connected to the swing drive motor l and the boom drive cylinder.
2 is a hydraulic pump for supplying hydraulic oil, 8 is a discharge amount control valve for the hydraulic pump 7, and 9 is an operation signal generator B5 that outputs an operation signal according to the amount of operation of the operation fIp lever 5.6.
By inputting the output signals from a and 6a and the engine speed signals N and NuAx, which will be described later, the control valve 31i and the solenoids 3++, 3b and 4cl+4 of 1 are input.
10 is the engine for driving the hydraulic pump 7 and the control pump 13; 11 is the fuel lever of the engine IO; 12 is the target rotation of the engine 10 set by the fuel lever 11; The number setting device 12.14 detects the rotation speed 1516 of the engine 10.
The engine rotational speed signal N and the discharge oil pressure signal P of the hydraulic pump 7 detected by the oil pressure detector 15 are input, and the discharge oil amount signal of the hydraulic pump 7 is input to the solenoid 8a for the discharge amount control valve of the hydraulic pump 7. Function generation side that outputs V, 1
7 is a power supply, 18 is a coil excited by the release switch 5a, 6aLf)ifIit provided on the operating lever 5゜6, 19 is a changeover switch, and 20 is for energizing the changeover switch 19 to the contact point. Spring, 2
1 is the release switch 5a.

6 Maximum fa of engine speed signal N when pressing a
This is a resistor for outputting a signal corresponding to Nvxx.

Further, 9a is an engine target rotation speed signal N output from the target rotation speed setting device 12 or the resistor 21 of engine]0.
Multiply the gain K corresponding to @+N &lag B9a
, 9b, the control device 9 outputs functions to the function generating means 9a and 3F! Calculation? It is composed of 59b and 9c. Next, the f-ya use will be explained. The hydraulic pressure pump 7 discharged from the hydraulic pump 7 driven by the engine 1O is connected to a hydraulic circuit to drive the swing hydraulic pressure tank 7-JJ and the boom hydraulic cylinder 2 through the actuator operation valve 3.4. is formed. Said operating valve 3. /
Operation to operate the I spool stroke (1: The signal is calculated as follows. When input to the function generating means 9a in the 9II device 9, this target rotational speed signal N,
Multiplication 59 in the same control device 6
l) +9 Output to c. One operation lever 5, 6
The operation signal X Lll X +,!
is output from the operation ear signal generators 5a, 5b to the multipliers D9b, 9c, the operation (1: signal -X 1.I+'
The operation signal of the operation valve 3.4 obtained by multiplying LM by the gain) is output to the solenoids 3a, 3b and 4a, 4b.

During light load work, the engine may be set to partial load and stalled in order to save fuel, but in this case, the amount of hydraulic fluid discharged from the hydraulic pump 7 decreases due to the decrease in the rotational speed of the engine 10. do.

When the swing hydraulic motor lii and the boom l1lI pressure cylinder 2 are operated in combination during partial load of the engine, the amount of hydraulic fluid discharged from the hydraulic pump 7 is decreasing, so that the load is reduced. The light actuator tries to flow towards the direction of the engine rotation, but the stroke of the spool for the operating valves 3 and 4 is adjusted by the amount corresponding to the engine speed. It is controlled so that it is throttled from when the load is full.As a result, the hydraulic oil discharged from the hydraulic pump 7 is transferred to the 1111-pressure pump l for swinging and the hydraulic cylinder for the boom in an amount corresponding to the amount of operation of the operating levers 5 and 6. 2. During light load work, if multiple operations are not required and the engine output has sufficient margin, the release switch 5a installed on the control lever 5.6, Press 5b to disconnect power from the power supply 17.
Since current flows through the coil 18, the changeover switch 19 is pulled against the force of the spring 20 and connected to the tc and B contacts. Therefore, the engine speed signal N set by the resistor 21
A signal corresponding to the maximum value N□ of Since the discharged ('P) dynamic extraction can be supplied to the swing hydraulic pump 1 or the boom hydraulic cylinder 2, the actuator can be driven at high speed even when the engine is partially loaded. I can do it.

If a combined operation becomes necessary during the IL independent operation, by releasing the release switches 5a and 6a, the stroke of the spools for the operating valves 3 and 4 relative to the operating amount of the operating levers 5 and 6 will be adjusted according to the engine speed. The engine is controlled to throttle down by the same amount as when the engine is at full load.

Therefore, the amount of hydraulic oil discharged from the hydraulic pump 7 can be supplied to the swing hydraulic pump l and the boom hydraulic cylinder 2 in an amount corresponding to the amount of operation of the operation lever 5.6. fIp properties can be improved. Note that this is input to the function generation 314.

When the discharge amount control signal (2) calculated from the oil pressure P and the engine speed N is output to the solenoid 8a for the discharge amount control device 8, the piston throttle 8b adjusts the oil pressure of the 1l111 control pump 13 in accordance with the discharge amount control signal V. The stroke is performed to control the discharge amount of the hydraulic pump 7.

(Effects of the Invention) As detailed above, the present invention provides the following effects.

(1) During light-load work, by operating the engine at partial load, even when operating l[number of actuators, the operating amount will be less than The stroke rate of the valve control spool is set to decrease by the amount corresponding to the decrease in the hydraulic pump discharge amount, so even if the stroke of the control lever is operated as usual, the hydraulic pump will not work. It is possible to supply the hydraulic oil discharged from the actuator to a high-load actuator, and it is possible to improve the composite-like 1'P performance.

(2) During light A cargo IIp work, even if the engine is operated at partial load, if the actuator is operated independently, if the drive source of the hydraulic pump has sufficient power, the stroke of the operating lever will be -The stroke limit of the operating valve spool can be easily removed.
By moving Akchee-Yu at high speed, f
￥tT&Efficiency can be greatly improved.

(3) When operating the engine at partial load during the above-mentioned light load engine operation, the ratio of the stroke of the operating button spool to the stroke of the operating lever is determined depending on whether the engine is operated multiple times or alone. Since the operator can switch the mode with a single touch, operator fatigue can be reduced.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention, and FIGS. 2 and 3 are diagrams showing a conventional technique. 1... Hydraulic motor for swing 2... Hydraulic cylinder for boom 3.4... Control valve 5.6... Control lever 7... Hydraulic pump 8... Discharge Quantity $11 Control device 9...ll1lI+device 9a...Function generating means 9b, 9c...Power IE3 10.e...Engine 11...Fuel lever 12... Target rotation speed setting 17...Power supply 18...Co/F 19...Changing switch 20...Spring 21...Resistance

Claims (2)

[Claims] (1) A plurality of actuators, a control valve for the actuator, a control lever that outputs a control signal for controlling the control valve, and a hydraulic pump that supplies hydraulic oil to each of the actuators via the control valve. and a flow control device with hydraulic oil amount compensation provided with means for changing the correlation between the stroke of the operating lever spool and the stroke of the operating valve according to a change in the discharge amount of the hydraulic pump, wherein the hydraulic oil amount compensation 1. A hydraulic oil amount compensation control device for an operating valve, characterized in that a switching device is provided to enable release and setting as necessary. (2) A hydraulic oil amount compensation control device for an operating valve according to claim (1), characterized in that a switching device is installed on the operating lever to enable release and setting of hydraulic oil amount compensation as necessary.