JPH0328627B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a hydraulic control valve with a display device for a hydraulic control system that displays various signals used to control the hydraulic control valve.

(Prior art) In recent years, in hydraulic control systems using hydraulic control valves, the PWM control method (pulse width control method) has been adopted for drive control of the hydraulic control valve, resulting in a significant reduction in the control circuit. Efforts have been made to reduce the size, and as a result,
Many types of valves in which the control circuit is integrated with the hydraulic control valve are beginning to be adopted.

In the case of a hydraulic control system using a hydraulic pressure control valve with an integrated control circuit, for example, as shown in Fig. 3, one is equipped with a display unit that displays the feedback signal output from the detector. It is considered.

In FIG. 3, reference numeral 1 denotes a control circuit, to which a command signal A is input from the outside, and through arithmetic processing based on this command signal A, the control circuit 1 outputs a drive signal B to the hydraulic pressure control valve 2. Hydraulic pressure control valve 2 is part of control circuit 1
The flow rate and pressure are controlled by actuation of an electromagnetic solenoid by the drive signal B from the controller, and control hydraulic pressure is supplied to a drive load such as a hydraulic cylinder. Furthermore, the control state of the hydraulic pressure control valve 2 is detected by a detector 3 and fed back to the control circuit 1 as a feedback signal C. The control state of the hydraulic control valve 2 is detected by the detector 3, for example, if the opening control is performed, the displacement of the spool is detected by a differential transformer, or if the pressure control is performed, the displacement of the spool is detected by a pressure transducer. Detects the control fluid pressure.

In order to monitor the control status of the control system, the feedback signal C of the detector 3 fed back to the control circuit 1 is sent to the A/D converter 5 of the display unit 4.
is input to convert it into digital data and display it on display 6.
The feedback signal C, that is, the control result of the hydraulic pressure control valve 2 is displayed on the display.

Figure 4 shows the appearance of the hydraulic control valve with display device used in the control system of Figure 3. 2a is the valve body, 2b is the electromagnetic solenoid, and the control circuit 1 and display are on the electromagnetic solenoid 2b. It is equipped with a control unit 7 with a built-in display unit 4.

(Problems to be Solved by the Invention) However, in such a conventional hydraulic pressure control valve with a display device, only the feedback signal C, which is the output of the control circuit 1, for example, is displayed on the display device 6. Therefore, when a hydraulic control valve malfunctions, it is not possible to check whether the control output is being performed correctly, and in the end, it is necessary to rely on empirical intuition, which results in the problem of time-consuming investigation of the cause of the malfunction and discovery of abnormal locations. It was hot.

(Means for Solving the Problems) The present invention has been made in view of such conventional problems, and even with one display device, command signals and drive signals used for hydraulic pressure control ( control output),
It is an object of the present invention to provide a hydraulic pressure control valve with a display device for a hydraulic pressure control system, which allows all types of information such as feedback signals to be monitored as necessary.

In order to achieve this objective, the present invention uses various control information such as command signals in the hydraulic control system, drive signals serving as control outputs, and feedback signals obtained by detecting the operating state of the valve with a detector. a switching circuit that inputs and switches and outputs one of the switching circuits; switching command means that issues a switching command to the switching circuit; and a display that displays the switching output of the switching circuit;
A display unit including a type display for displaying the type of display information in response to a switching command from the switching command means is provided integrally with the hydraulic pressure control valve.

(Function) According to the configuration of the present invention, when the hydraulic pressure control valve malfunctions, various controls such as command signals, drive signals, feedback signals, etc. in hydraulic pressure control can be performed by operating the switch of the switching command means. Information can be switched and displayed on a display for monitoring, and the cause of a malfunction can be determined from an abnormality in a monitor signal, and appropriate and prompt countermeasures can be taken.

(Example) FIG. 1 is an explanatory diagram of a control system using the hydraulic pressure control valve with display of the present invention.

First, to explain the configuration, 1 is a control circuit;
A command signal A as a control target value is input, and a drive signal (current signal) B is output to the hydraulic control valve 2 by control calculation based on this command signal A. The hydraulic pressure control valve 2 controls the flow rate by controlling the spool opening degree or the pressure control by controlling the relief flow rate by operating an electromagnetic solenoid in response to a drive signal B from the control circuit 1. The control hydraulic pressure controlled by the hydraulic pressure control valve 2 is supplied to a control load such as a hydraulic cylinder (not shown).

The control state of the hydraulic control valve 2 is detected by a detector 3. For example, if the flow rate control (opening control) is being performed, the amount of displacement of the spool is detected by a differential transformer, etc. If so, the control fluid pressure is detected by a pressure transducer. A detection signal indicating the operating state of the hydraulic control valve 2 detected by the detector 3 is fed back to the control circuit 1 as a feedback signal C.

For such a control system for the hydraulic control valve 2, a display unit 10 is provided integrally with the hydraulic control valve 2, and the switching circuit 12 of the display unit 10 receives command signals A and drive signals from the control circuit 1. (Control output) B and feedback signal C are each input, and the switching circuit 12 switches and outputs any one of the input signals A, B, and C. The switching operation of the switching circuit 12 can be performed by operating a changeover switch provided in the changeover input device 14. When the changeover switch is operated, the changeover input device 14
outputs a switching command signal consisting of a data code corresponding to each of the input signals A, B, and C to the switching circuit 12 each time the switch is operated, and the switching input device 14
One of the switching signals corresponding to the switching data code is output.

The output of the switching circuit 12 is converted into a digital signal by an A/D converter 16 and displayed numerically on a display 18.

On the other hand, the switching data code from the switching input device 14 is given to a type display control circuit 20, and type display devices 20a, 20b, and 20c for displaying the type of the display signal on the display 18 are connected to the type display control circuit 20. and displays one of the type indicators corresponding to the switching data code from the switching input device 14,
It is possible to identify whether the numerical value displayed on the display 18 is a command signal A, a drive signal B, or a feedback signal C.

FIG. 2 is an explanatory diagram showing the display panel in the display unit 10 in FIG. Type display devices 20a, 20b, and 20c for this purpose, and a changeover switch button 14a of the changeover input device 14 are provided. Here, since the type display 20a represents the command signal A, it is displayed as "IN", and since the command signal is a voltage signal, the unit is "V".
It is shown. Further, since the type display 20b represents the drive signal B from the control circuit 1, "OUT" is displayed, and since the drive signal B is a current signal, its unit "A" is shown.
Furthermore, the type display 20c displays a feedback signal C.
For example, since the pressure of the control fluid pressure is detected by a pressure transducer, "P" is displayed, and the unit is "Kgf/cm ² ".

Next, to explain the operation of the above embodiment, first, in a control system consisting of a control circuit 1, a hydraulic control valve 2, and a detector 3, the control circuit 1 receives a command signal A.
and the detector 3 output a drive signal B to the hydraulic pressure control valve 2 through arithmetic processing based on the feedback signal C to drive it, and the operation of the hydraulic pressure control valve 2 based on this drive signal B causes the hydraulic cylinder, etc. to be activated as appropriate. The control fluid pressure is supplied to the load.

On the other hand, the input signal A, drive signal B, and feedback signal C are input to the switching circuit 12 of the display unit 10, and at this time, the binary switching data code output from the switching input device 14 is Any one of input signals A to C based on
For example, a switching operation is performed to output an input signal A, and the command signal A, which is the switching output from the switching circuit 12, is converted into a digital signal by the A/D converter 16, and the voltage value is displayed on the display 18 as a numerical value. Is displayed.

At the same time, the switching data code from the switching input device 14 is given to the type display control circuit 20, and the type display control circuit 20 decodes the inputted switching data code and displays the type display 20a corresponding to the command signal A.
is driven to display, indicating that the data numerically displayed on the display 18 is the command signal A.

Of course, the changeover switch button 14a of the changeover input device 14
When operated, the binary switching data code output from the switching input device 14 changes, and the switching circuit 12 obtains a switching output of drive signal B or feedback signal C, which is numerically displayed on the display 18, and at the same time changes the type. The type is displayed by driving the display 20b or 20c.

In addition, in the above embodiment, the command signal A, the drive signal B,
Although the switching display of three pieces of control information of the feedback signal C has been taken as an example, the present invention is not limited to this, and by increasing the capacity of the switching circuit 12 and the switching input device 14, various types of control information can be used in the control system. You can switch and display various information and monitor it.

(Effects of the Invention) As explained above, according to the present invention, various control information such as command signals and feedback signals in the control system are inputted to the display unit provided integrally with the hydraulic control valve, and switching input is performed. Based on the switching command from the device, one of the outputs is switched and displayed on the display, and the type of display information is displayed. Therefore, in the event of a malfunction of the hydraulic control system, Various types of information in the hydraulic control system can be switched and displayed for monitoring, and the cause and location of failure can be determined appropriately and quickly from information indicating abnormal values, and the cause of failure can be determined with a simple display switching operation. It is possible to understand the situation and take appropriate measures against abnormalities.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is an explanatory diagram of the display panel surface of the display unit shown in FIG. 1, FIG. 3 is a block diagram showing a conventional example, and FIG. FIG. 2 is an explanatory diagram of the external appearance of a hydraulic control valve with an integrated display unit. 1: Control circuit, 2: Hydraulic pressure control valve, 3: Detector,
10: Display unit, 12: Switching circuit, 14: Switching input device, 14a: Switching switch button, 16: A/
D converter, 18: Display device, 20: Type display control circuit, 20a to 20c: Type display device.

Claims (1)

[Scope of Claims] 1. A drive signal corresponding to a command signal for a control circuit is output to a hydraulic pressure control valve to drive it, and a detector detects the operating state of the hydraulic pressure control valve and provides feedback to the control circuit. In a hydraulic control system, there is provided a switching circuit that receives various control information such as a command signal, a drive signal, and a feedback signal in the control circuit and switches and outputs one of them, and instructs the switching circuit to perform a switching operation. a switching command means;
It is characterized by integrally comprising a display unit having a display for displaying the signal obtained from the switching circuit and a type display for displaying the type of display signal according to the switching command from the switching command means. Hydraulic pressure control valve with display device for hydraulic control system.