JP3801719B2 - Hydraulic actuator controller - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hydraulic actuator control device.
[0002]
[Prior art and problems to be solved by the invention]
In recent years, some high-pressure presses aimed at synthesizing new substances under ultra-high pressure and measuring material properties, which are the focus of attention, have a minimum of 2-50 MN.
[0003]
As an example of this application, there are pressure vessels and hydraulic cylinders with a hydraulic pressure of 70 MPa or more, and long-term pressurization / decompression program control of these pressure vessels and hydraulic cylinders has grown in demand with the recent development of automatic measuring instruments. Yes.
[0004]
In this type of control, high-precision pressure or flow rate control proportional to the control voltage can be achieved by simply driving the constant discharge hydraulic pump from an induction motor to an inverter motor.
[0005]
On the other hand, pressure reduction is usually performed by a control valve, and unlike the pump, the driving force may be small, but the pressure on the inflow side affects the flow rate of the control valve. For this reason, in order to realize precise high-pressure control, unlike conventional control valves, a device having a flow rate characteristic independent of pressure is desired.
[0006]
The present invention has been made in order to solve the above-described conventional problems, and applies a pump capable of obtaining a flow rate control characteristic independent of pressure in the pressure increasing process to the pressure reducing process, thereby controlling the flow rate independent of pressure in the pressure reducing process. A highly practical hydraulic actuator control device capable of realizing precise pressure control or load control having characteristics is provided.
[0007]
[Means for Solving the Problems]
The gist of the present invention will be described with reference to the accompanying drawings.
[0008]
A hydraulic actuator control device for controlling pressure increase or depressurization control of the hydraulic actuator 3 based on the amount of liquid supplied in the liquid supply line 4 or the amount of return liquid in the return liquid line 5, wherein the liquid supply line 4 variable discharge pump 1 is disposed on the, also the even Modoeki pipe 5 is disposed the discharge amount variable pump 2, the variable discharge the liquid outlet side of the pump 2 proportional pressure control valve 6 and a pressure control valve such as a differential pressure valve 7 are provided.
[0009]
Further, the hydraulic actuator control device according to claim 1, wherein the ratio example the pressure control valve 6 and the differential pressure valve 7 the liquid pressure on the outflow side of the ejection exit variable pump 2 pressure control valve is attached, such as those of the hydraulic actuator control device according to claim and this was higher than the control pressure from the pressure actuator 3.
[0010]
Further, the hydraulic actuator control apparatus controls the pressure increase or decrease of the pressure of the hydraulic actuator 23 by the amount of liquid supplied in the liquid supply line 24 or the amount of return liquid in the return liquid line 25. the conduit 24 is pressurized for pump 21 is arranged, also, before Symbol in Modoeki conduit 25 the pressure-reducing pump 22 is provided, for driving the said booster pump 21 and the vacuum pump 22 variable motor 20 is installed together, the said liquid supply conduit 24 is provided a check valve 28, solenoid valve 26 for unloading is attached in between the booster pump 21 and the check valve 28, the with pressure control valve, such as a differential pressure valve 30 is in fluid outflow side of the decompression pump 22 and the proportional pressure control valve is disposed, the liquid outflow side of the decompression pump 22 so as to continuously provided to the hydraulic actuator 23 the bypass solenoid valve 27, characterized in that the check valve 29 is disposed in the hydraulic actuator 23 side Those of the pressure actuator controller.
[0011]
The hydraulic actuator control apparatus according to claim 3 , wherein a safety valve 33 is provided in the liquid supply pipe line 24 .
[0012]
[Action and effect of the invention]
When the discharge amount variable pump 1 is arranged in the liquid supply line 4 and the liquid is sent to the hydraulic actuator 3 by the variable discharge amount pump 1, the control pressure of the hydraulic actuator 3 can be increased, and the return liquid line 5 is provided with a variable discharge pump 2 and pressure control valves such as a proportional pressure control valve 6 and a differential pressure valve 7 are provided on the liquid outflow side of the variable discharge pump 2. set above the control pressure, liquid can be delivered to the pressure control valve was boosted to a predetermined pressure in the discharge amount variable pump 2, therefore, it is varied to control pressure of the hydraulic actuator 3, the pressure control valve Therefore, the flow rate of the liquid passing through the fluid does not change, and therefore, the flow rate control independent of the control pressure of the hydraulic actuator 3 can be performed, so that precise pressure control or load control can be realized. It can be.
[0013]
If the pressure control valve is set to be equal to or lower than the control pressure of the hydraulic actuator 3, the liquid sent to the pressure control valve flows suddenly, which may affect the control pressure of the hydraulic actuator 3.
[0014]
Further, the proportional pressure control valve 6 and the differential pressure valve 7 that detect the outflow side pressure of the discharge amount variable pump 2 and control the discharge pressure of the discharge amount variable pump 2 disposed in the return liquid pipe 5 are used as pressure control valves. If used, the pressure on the outflow side of the variable discharge pump 2 can be set to a pressure slightly higher than the control pressure of the hydraulic actuator 3, and the pressure on the outflow side of the variable discharge pump 2 can be set higher than necessary. You do n’t have to.
[0015]
If the pressure on the outflow side of the discharge variable pump 2 provided with pressure control valves such as the proportional pressure control valve 6 and the differential pressure valve 7 is set higher than the control pressure from the hydraulic actuator 3, the variable discharge pump 2 The liquid sent to the pressure control valve does not flow out more than necessary.
[0016]
Further, when a boosting pump 21 is disposed in the liquid supply line 24 and liquid is sent to the hydraulic actuator 23 by the boosting pump 21, the control pressure of the hydraulic actuator 23 can be increased, and the return liquid pipe When the pressure reducing pump 22 is arranged in the passage 25 and the liquid is sent out by the pressure reducing pump 22, the control pressure of the hydraulic pressure actuator 23 can be reduced, and the pressure increasing pump 21 and the pressure reducing pump 22 are variable for driving. By installing the motor 20, it is possible to control the boosting pump 21 and the decompression pump 22, and it is very practical to control the control pressure of the hydraulic actuator 23 with high accuracy with a very simple configuration. Can be high.
[0017]
Further, a check valve 28 is provided in the liquid supply line 24, an unloading electromagnetic valve 26 is provided between the check valve 28 and the pressure increasing pump 21, and a pressure difference valve 30 is provided on the liquid outflow side of the pressure reducing pump 22. In addition, a pressure control valve such as a proportional pressure control valve is provided, and a bypass solenoid valve 27 is provided on the liquid outflow side of the pressure reduction pump 22 and a check valve is provided on the hydraulic pressure actuator 23 side so as to be connected to the hydraulic pressure actuator 23. 29, when the hydraulic actuator 23 is boosted, the unloading solenoid valve 26 is turned off, the bypass solenoid valve 27 is turned on, and the drive variable motor 20 is driven. The liquid discharged from the fluid passes through the check valve 28 and flows to the hydraulic actuator 23 to increase the pressure of the hydraulic actuator 23.
[0018]
When the hydraulic actuator 23 is depressurized, when the unloading solenoid valve 26 is turned on and the bypass solenoid valve 27 is turned off and the drive variable motor 20 is driven, the liquid discharged from the booster pump 21 is unloaded. Return to the tank 31 through the solenoid valve 26 for loading, and at the same time, the liquid from the hydraulic actuator 23 passes through the return line 25 and the pressure reducing pump 22, and the pressure control valves such as the differential pressure valve 30 and the proportional pressure control valve Then, the pressure returns to the tank 31 and the pressure of the hydraulic actuator 23 can be reduced.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
A hydraulic actuator control apparatus according to an embodiment of the present invention will be described below with reference to the drawings.
[0020]
A pressure control device for the pressure vessel 3 used for controlling the internal pressure of the pressure vessel 3 as the hydraulic actuator 3 will be described below with reference to FIG.
[0021]
As shown in FIG. 1, the pressure control device for the pressure vessel 3 according to the present embodiment controls the pressure increase or the pressure reduction of the pressure vessel 3 in the supply amount in the supply line 4 or in the return line 5. It is configured so that it can be controlled by the amount of returned liquid.
[0022]
A liquid supply line 4 and a return liquid line 5 are disposed in the pressure vessel 3, and a discharge amount variable pump 1 is disposed in the liquid supply line 4. Is configured so that it can be supplied.
[0023]
A safety valve 13 is provided in the liquid supply line 4 between the pressure vessel 3 and the discharge amount variable pump 1, and when a pressure abnormality or the like occurs in the liquid supply line 4 and pressure adjustment is necessary, etc. The oil 12 can be returned from the safety valve 13 to the tank 11.
[0024]
In the return liquid line 5 disposed in the pressure vessel 3, a discharge amount variable pump 2 is disposed, and a proportional pressure control valve 6 is disposed as a pressure control valve on the oil 12 outflow side of the discharge amount variable pump 2.
[0025]
This proportional pressure control valve 6 is disposed to detect the pressure of the oil 12 outflow side of the variable discharge pump 2 and to control the discharge pressure of the variable discharge pump 2 disposed in the return liquid line 5. .
[0026]
A pressure sensor 9 is connected between the pressure vessel 3 of the liquid supply line 4 and the discharge amount variable pump 1, and an output side of the pressure sensor 9 is connected to the control valve amplifier 8.
[0027]
A pressure sensor 10 is connected to the connecting portion between the variable discharge pump 2 and the proportional pressure control valve 6, and the output side of the pressure sensor 10 is connected to the control valve amplifier 8.
[0028]
The output side of the control valve amplifier 8 is connected to the proportional pressure control valve 6.
[0029]
Next, a case where a differential pressure valve 7 is used as a pressure control valve instead of the proportional pressure control valve 6 will be described with reference to FIG.
[0030]
When the differential pressure valve 7 is used as the pressure control valve, the basic configuration is the same as that of FIG. 1 using the proportional pressure control valve 6 as the pressure control valve, and the difference is made to the oil 12 outflow side of the variable discharge pump 2. A pressure valve 7 is provided.
[0031]
As shown in FIG. 3, the differential pressure valve 7 has a discharge amount variable pump discharge side passage 14 connected to the oil 12 outflow side of the discharge amount variable pump 2 and a cross sectional area of the discharge amount variable pump discharge side passage 14. It has a variable discharge pump inflow side passage 15 connected to the oil 12 inflow side of the discharge variable pump 2 having a slightly larger cross-sectional area, and the input pressure to the discharge variable pump discharge side passage 14 and the discharge variable pump There is a tank side passage 16 through which oil 12 flowing out from the discharge amount variable pump 2 flows out to the tank 11 via the discharge amount variable pump discharge side passage 14 due to the differential pressure of the input pressure to the inflow side passage 15.
[0032]
Another embodiment of the pressure control device for the pressure vessel 3 used for the internal pressure control of the pressure vessel 3 as the hydraulic actuator 3 will be described below with reference to FIG.
[0033]
As shown in FIG. 4, the pressure control device for the pressure vessel 23 as the hydraulic actuator 23 of another embodiment is configured to control the pressure increase or the pressure reduction of the pressure vessel 23 in the liquid supply line 24 or the return amount. It is configured so that it can be controlled by the amount of return liquid in the liquid pipe 25.
[0034]
The pressure vessel 23 is provided with a liquid supply line 24 and a return liquid line 25, and the liquid supply line 24 is provided with a booster pump 21 such as a discharge amount variable pump, and a tank is provided in the booster pump 21. The oil 32 is supplied from 31.
[0035]
A check valve 28 is provided in the liquid supply line 24, and an unloading solenoid valve 26 is provided between the check valve 28 and the boosting pump 21 so that oil is supplied from the unloading solenoid valve 26 to the tank 31. In addition, a safety valve 33 is provided so that the oil 32 in the liquid supply line 24 can be returned from the safety valve 33 to the tank 31.
[0036]
A pressure reducing pump 22, such as a variable discharge pump, is provided in the return liquid line 25 provided in the pressure vessel 23, and a differential pressure valve 30 is provided as a pressure control valve on the oil 32 outflow side of the pressure reducing pump 22. Thus, the oil 32 can be returned from the differential pressure valve 30 to the tank 31.
[0037]
At the connection between the pressure reducing pump 22 and the differential pressure valve 30, a bypass solenoid valve 27 is provided on the oil 32 outflow side of the pressure reducing pump 22 and a check valve 29 is provided on the pressure vessel 23 side so as to be connected to the pressure vessel 23. Arrange.
[0038]
The variable pressure drive motor 20 is provided in the boost pump 21 and the decompression pump 22.
[0039]
In the above description of the embodiment, the pressure control device for the pressure vessel 3 has been described. However, the pressure control device of this embodiment is not only used for pressure control but also for load control of a hydraulic cylinder or the like as the hydraulic actuators 3 and 23. The same applies to the above.
[0040]
In the present embodiment, as described above, when the discharge amount variable pump 1 is disposed in the liquid supply line 4 and the oil 12 is sent to the hydraulic actuator 3 by the discharge amount variable pump 1, the control of the hydraulic actuator 3 is performed. The pressure can be increased, and the discharge amount variable pump 2 is disposed in the return liquid line 5, and pressure control valves such as a proportional pressure control valve 6 and a differential pressure valve 7 are provided on the liquid outflow side of the discharge amount variable pump 2. If the pressure control valve is set to be equal to or higher than the control pressure of the hydraulic actuator 3 and the oil 12 is sent to the pressure control valve by the variable discharge pump 2, this control is performed even if the control pressure of the hydraulic actuator 3 is changed. The control pressure of the hydraulic actuator 3 can be reduced by the flow control independent of the pressure without changing the flow rate of the liquid passing through the pressure control valve due to the pressure change, and the flow control independent of the pressure in the pressure reduction process. Precise with characteristics It can be made very practical so that pressure control or load control can be realized.
[0041]
If the pressure control valve is set to be equal to or lower than the control pressure of the hydraulic actuator 3, the liquid sent to the pressure control valve flows suddenly, which may affect the control pressure of the hydraulic actuator 3.
[0042]
Further, the proportional pressure control valve 6 and the differential pressure valve 7 that detect the outflow side pressure of the discharge amount variable pump 2 and control the discharge pressure of the discharge amount variable pump 2 disposed in the return liquid pipe 5 are used as pressure control valves. If used, the pressure on the outflow side of the variable discharge pump 2 can be set to a pressure slightly higher than the control pressure of the hydraulic actuator 3, and the pressure on the outflow side of the variable discharge pump 2 can be set higher than necessary. You do n’t have to.
[0043]
If the pressure on the outflow side of the discharge variable pump 2 provided with pressure control valves such as the proportional pressure control valve 6 and the differential pressure valve 7 is set higher than the control pressure from the hydraulic actuator 3, the variable discharge pump 2 The oil 12 sent to the pressure control valve can be prevented from flowing out more than necessary.
[0044]
Further, when a booster pump 21 is disposed in the liquid supply line 24 and the oil 32 is sent to the hydraulic actuator 23 by the booster pump 21, the control pressure of the hydraulic actuator 23 can be increased, and the return liquid When the pressure reducing pump 22 is disposed in the pipe line 25 and the oil 32 is sent out by the pressure reducing pump 22, the control pressure of the hydraulic actuator 23 can be reduced, and the pressure increasing pump 21 and the pressure reducing pump 22 are driven. The variable pressure motor 20 can be used to control the boost pump 21 and the decompression pump 22, and the control pressure of the hydraulic actuator 23 can be increased and reduced with high accuracy with a very simple configuration. It can be made highly practical.
[0045]
Also, a check valve 28 is provided in the liquid supply line 24, an unloading electromagnetic valve 26 is provided between the check valve 28 and the boosting pump 21, and a pressure control valve is provided on the liquid outflow side of the decompression pump 22. As well as a differential pressure valve 30 and a bypass solenoid valve 27 on the oil 32 outflow side of the pressure reducing pump 22 and a check valve 29 on the hydraulic pressure actuator 23 side so as to be connected to the hydraulic actuator 23. When the hydraulic actuator 23 is boosted, the unloading solenoid valve 26 is turned off, the bypass solenoid valve 27 is turned on, and when the drive variable motor 20 is driven, the oil 32 discharged from the boosting pump 21 Can flow through the check valve 28 to the hydraulic actuator 23 to increase the pressure of the hydraulic actuator 23.
[0046]
When depressurizing the hydraulic actuator 23, the unloading solenoid valve 26 is turned on, the bypass solenoid valve 27 is turned off, and when the drive variable motor 20 is driven, the oil 32 discharged from the booster pump 21 is Through the unloading electromagnetic valve 26, it returns to the tank 31, and at the same time, the oil 32 from the hydraulic actuator 23 passes through the return liquid line 25, passes through the pressure reducing pump 22, and returns to the tank 31 through the differential pressure valve 30, The pressure of the hydraulic actuator 23 can be reduced.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a hydraulic actuator control device according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram showing a hydraulic actuator control device according to an embodiment of the present invention.
FIG. 3 is an explanatory view showing a differential pressure valve used in a hydraulic actuator control device according to an embodiment of the present invention.
FIG. 4 is an explanatory view showing a hydraulic actuator control device according to another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Discharge amount variable pump 2 Discharge amount variable pump 3 Hydraulic pressure actuator 4 Supply liquid line 5 Return liquid line 6 Proportional pressure control valve 7 Differential pressure valve
20 Variable motor for driving
21 Booster pump
22 Pressure reducing pump
23 Hydraulic actuator
24 Supply line
25 Return line
26 Solenoid valve for unloading
27 Solenoid valve for bypass
28 Check valve
29 Check valve
30 Differential pressure valve
33 Safety valve

Claims (4)

A hydraulic actuator control device for controlling pressure increase or decrease control of a hydraulic actuator by a supply amount in a supply liquid line or a return liquid amount in a return liquid line, and discharging to the supply line the amount variable pump is arranged, also, the even discharge amount variable pump Modoeki pipe is disposed, the pressure control valve, such as a proportional pressure control valve and differential pressure valve in the liquid outlet side of the discharge amount variable pump Is attached to the hydraulic actuator control device . In hydraulic actuator control device according to claim 1, the control of the pressure on the outflow side of the ejection exit variable pump pressure control valve is attached, such as the Proportional pressure control valve and the differential pressure valve from said fluid pressure actuator hydraulic actuator control device characterized that you set higher than the pressure. A hydraulic actuator control apparatus for controlling pressure increase or pressure reduction control of a hydraulic actuator by a liquid supply amount in a liquid supply line or a return liquid amount in a return liquid line, wherein the pressure increase in the liquid supply line use pump is arranged, also, before Symbol Modoeki conduit disposed depressurizing pump is in the boost pump and vacuum pump juxtaposed driving variable motor, the liquid supply pipe A check valve is provided in the passage, an electromagnetic valve for unloading is provided between the check valve and the boosting pump, and a differential pressure valve, a proportional pressure control valve, etc. are provided on the liquid outflow side of the pressure reducing pump. And a bypass solenoid valve on the liquid outflow side of the pressure reducing pump and a check valve on the hydraulic actuator side so as to be connected to the hydraulic actuator. A hydraulic actuator control device . 4. The hydraulic actuator control device according to claim 3 , wherein a safety valve is provided in the liquid supply pipe line.

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