JP3174440B2 - Solenoid valve control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for transmitting solenoid valve driving data for driving a plurality of solenoid valves connected to a manifold as a serial signal from a main controller, and receiving the serial signal at a sub controller. An electromagnetic valve control that converts the signals into parallel signals, drives a plurality of electromagnetic valves with the parallel signals, and detects whether the electromagnetic valves are operating properly based on the operating state of a hydraulic actuator that operates when the electromagnetic valves are driven. Related to the device.

[0002]

2. Description of the Related Art Conventionally, this type of solenoid valve control device is shown in FIG. 3 described in Japanese Patent Publication No. Hei 3-13466. This has a plurality of solenoid valves 50A, 50B, 50
A sub-controller 52 for collectively driving each solenoid valve is provided in a manifold 51 in which C, 50D, and 50E are connected in series, and the sub-controller 52 and the main controller 53 are connected by communication lines 54A and 54B. Each of the solenoid valves 50A, 50B, 5
Passages 55A, 55 for transmitting solenoid valve driving data for driving the solenoid valves 0C, 50D, 50E as serial signals, converting them into parallel signals by the sub-controller 52 to drive the respective solenoid valves, and supplying and discharging the working liquid.
B, 55C, 55D, 55E, 55F, 55G, 55H
Cylinders 56A and 56 as more hydraulic actuators
The working liquid was supplied to B, 56C and 56D. The quality of the operation of the solenoid valves 50A, 50B, 50C, 50D, and 50E is determined by the cylinders 56A, 56B, 56C, and 56D.
Detection switches 57A and 57A
B, 57C, 57D, 57E, 57F, 57G, 57H
Is installed in the cylinder, and the electric wiring of these detection switches is individually connected to the sub-controller 52 for each detection switch, and the detection signals output collectively from each detection switch are converted into a serial signal by the sub-controller 52. The data is converted and transmitted to the main controller 53.

[0003]

However, in this case, as the number of solenoid valves connected to the manifold increases, the number of detection switches installed on the hydraulic actuator also increases.
The number of wires increases. Such an electromagnetic valve control device is generally provided in a small size, and wires are connected one by one to a small terminal block installed in a narrow place in a sub-controller using a tool such as a screwdriver. Therefore, there is a problem that the wiring work becomes extremely difficult, and the wiring work is easily affected by noise generated from an inductive load such as a solenoid, which leads to a detection failure.

The present invention solves such a problem, and provides an electromagnetic valve control device capable of satisfactorily detecting the operation of an electromagnetic valve by reducing the wiring of a detection switch installed in a hydraulic actuator. The purpose is to do.

[0005]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a main controller having a communication device for transmitting solenoid valve driving data for driving a plurality of solenoid valves connected to a manifold as a serial signal, and a main controller. And a sub-controller having a communicator that receives a serial signal transmitted from the communicator and converts it into a parallel signal, and the solenoid valve is driven by the received solenoid valve driving data of the sub-controller to operate. A plurality of hydraulic actuators are provided with detection switches for detecting the operating states of these hydraulic actuators. These detection switches include an address switch in which an address of the detection switch is set, address data set by the address switch, and the address data. A comparator for comparing with address selection data for selecting a predetermined address, and transmitting the address selection data to the comparator and comparing the comparators The auxiliary controller is provided with a communication controller for receiving a detection signal indicating the operating state of the hydraulic actuator output from the detection switch according to the result, and a plurality of detection switches and the communication controller are provided in parallel with a communication line. ing.

[0006]

In the configuration of the present invention, when the solenoid valve connected to the manifold is driven by the sub-controller based on the solenoid valve driving data transmitted as a serial signal from the main controller, a plurality of detection switches are provided. The address selection data is transmitted to all the detection switches via the communication line from the communication controller connected in parallel with the communication line. The address selection data is compared with the address data set by the address switch in each detection switch by the comparator, and a detection signal detected by the matching detection switch is returned from the detection switch to the communication controller via the communication line. To be
The operation of the solenoid valve can be detected satisfactorily by reducing the wiring of the detection switch installed on the hydraulic actuator.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1 and 2, 1A, 1B, 1C,
1D, 1E, 1F, 1G, and 1H are solenoid valves provided on both sides of the manifold 2 and have a pair of pilot-operated switching valves 3A, 3B, 3C, and 3D provided on the front of the manifold 2, respectively. The switching valve 3A is controlled to be switched by pilot operation of the valves 1A and 1B. 4
A, 4B, 4C, 4D are cylinders as hydraulic actuators, and hydraulic hoses 5A, 5B, 5C, 5D, 5E,
5F, 5G and 5H are connected to the ports of the manifold 2 respectively, and the piston rods 6A, 6B, 6C and 6D are provided so as to move forward and backward in the left and right directions in the drawing by controlling the switching of the switching valves 3A, 3B, 3C and 3D. I have. 7A, 7
B, 7C and 7D are detection switches for detecting the operation states of the cylinders 4A, 4B, 4C and 4D.
B, 4C, 4D, and provided at the ends of the piston rods 6A, 6
B, 6C, and 6D are provided to detect the forward ends, respectively. 8 is a sub-controller provided on the upper surface of the manifold 2, 9
Is a main controller installed at a location remote from the manifold 2.

The main controller 9 comprises, for example, a programmable controller and is configured as follows. 10
Denotes an input device, and an input device 11 such as a keyboard and a data line 1
2, and the input device 11 inputs electromagnetic valve drive data in which each bit has information on the energizing / deactivating operation of one electromagnetic valve in 1-byte units. 13 is a controller,
It is connected to the input device 11 by a data line and connected to the memory 14 by a data line, so that the solenoid valve driving data input to the input device 11 is stored in the memory 14 and the data stored in the memory 14 is read. . A communication device 15 is capable of bidirectional communication. The communication device 15 is connected to the controller 13 by a data line 16 and is connected by a communication permission line 17 based on a communication permission signal sent from the controller 13 via the communication permission line 17. The electromagnetic valve drive data is transmitted as a continuous serial signal for each bit, and the continuous serial signal for each bit is received as a parallel signal in units of 1 byte. Reference numeral 18 denotes a display for displaying data stored in the memory.

The sub-controller 9 is configured as follows.
Reference numeral 19 denotes a communicator capable of bidirectional communication. The communicator 19 is connected to the communicator 15 of the main controller 9 via a communication line 20, and receives an electromagnetic signal transmitted from the main controller 9 based on a communication permission signal transmitted from the main controller 9. The serial signal of the valve drive data is received as a parallel signal of 1 byte unit, and the parallel detection signal of 1 byte unit detected by the detection switches 7A, 7B, 7C, 7D is transmitted to the main controller 9 as a serial signal. Is provided. A controller 21 has its input port connected to the communication device 19 via the data line 22 and its output port connected to the amplifier 23 and the output line 24. Each bit of the parallel solenoid valve drive data received by the communication device 19 Are solenoid valves 1 in order from the top of the figure of eight output lines 24.
A signal for turning on / off each solenoid valve is provided to the amplifier 23 so as to correspond to A, 1B, 1C, 1D, 1E, 1F, 1G, and 1H. The amplifier 23 has eight output terminals connected to the solenoid valves 1 in order from the top via eight current detectors 25.
Solenoids 26A, 26B, 26C, 26D, 26 having A, 1B, 1C, 1D, 1E, 1F, 1G, 1H
E, 26F, 26G, and 26H are connected by a power line 27 to amplify the signal of each solenoid valve output from the controller 21 and to energize and deactivate a solenoid of each solenoid valve with an excitation current. I have. Each of the current detectors 25 is composed of, for example, a resistor having a low resistance value, and detects a voltage drop caused by a current flowing through the resistor. 2
Reference numeral 8 denotes a decision unit which is connected to a current detector 25 by a signal line 29 and an output line 24 connecting the controller 21 and the amplifier 23.
Are branched and connected, and the solenoid valve driving data output by the controller 21 is compared with the deactivation signal of each solenoid detected by the current detector 25 to determine whether the amplifier 23 is operating properly. Is input to the controller 21 via the determination data line 30. Reference numeral 31 denotes a memory, which is connected to the controller 21 by a data line 32, stores the determination result of the determiner 28 input to the controller 21, and detects the detection switches 7A, 7B, 7C, 7D set by the address switches 33. Address data is stored. 34 is a communication controller,
Detection switches 7A, 7B, 7 stored in memory 31
It has a signal generator 35 for outputting address selection data based on C and 7D address data, and an input / output unit 36 for inputting and outputting signals, and is connected to the controller 21 via a command signal line 37 and a data line 38, respectively. are doing.

Each of the detection switches 7A, 7B, 7C and 7D has an address switch 33 for setting address data in a 4-bit bit pattern, and a converter 3 for converting serial address selection data into parallel signals every 4 bits.
9, a comparator 40 for comparing the address data of the address switch 33 with the parallel address selection data converted by the converter 39, and a detector 41 for detecting the presence or absence of a detected object when the two data match. Provided, each detection switch 7
The converter 39 of A, 7B, 7C, and 7D and the signal generator 35 of the communication controller 34 are connected in parallel by a communication line 42,
The output terminal of the detector 41 of each detection switch 7A, 7B, 7C, 7D and the input / output device 36 of the communication controller 34 are connected to the communication line 4.
3 and the detection switch 7 selected by the communication controller 34
The detection signals of A, 7B, 7C, and 7D are provided to be input to the input / output device 36 of the communication controller 34.

Next, the operation of the above configuration will be described. The solenoid valve drive data in 1-byte units input from the input device 11 to the input device 10 of the main controller 9 is transmitted to the communication device 15 of the main controller 9.
Is transmitted to the communication device 19 of the sub-controller 8 via the communication line 20 as a serial signal continuous for each bit. Sub-controller 8
The serial signal received by the communication device 19 is converted into a parallel signal and then input to the controller 21. The controller 21
Solenoids 26A, 26B, 26C, 2 are connected to the output lines 24 based on the solenoid valve drive data converted into parallel signals.
Signals for energizing and deactivating 6D, 26E, 26F, 26G, and 26H are output in parallel. Only the signal relating to the energization and deactivation is amplified by the amplifier 23. The amplifier 23 supplies an exciting current to the corresponding solenoid via the power line 27 to drive the solenoid valve. The operation of the cylinder can be obtained by controlling the switching of the corresponding switching valve by the pilot operation of the solenoid valve.

At this time, the exciting current flowing through the power line 27 is detected by the current detector 25. The determiner 28 compares the solenoid valve drive data output from the controller 21 with the energizing deactivation signal of each solenoid detected by the current detector 25 for each bit to determine whether the operation of the amplifier 23 is good. This result is stored in the memory 31 through the controller 21 from the determination data line 30 as operation data of the amplifier.

The operating state of the cylinder is determined by the signal generator 35 of the communication controller 34 connecting the detection switches 7A, 7
Each detection switch is selected in the order of 7A, 7B, 7C, and 7D based on the address selection data sequentially output to B, 7C, and 7D, and the detection signal of the selected detection switch is input to the communication controller 34 through the communication line 43. The signals are sequentially input to the output device 36. The detection signals sequentially input to the input / output unit 36 are stored in the memory 31 via the controller 21 as parallel detection data in units of one byte including the detection signal in one bit.

The controller 13 of the main controller 9 outputs a reception signal to the communication device 15 via the communication permission line 17. At this time, the amplifier 23 stored in the memory 31 of the sub-controller 8
Operation data and detection data of the detection switches 7A, 7B, 7C, 7D are transmitted from the communication device 19 of the sub-controller 8 to the main controller 9
Are transmitted as serial signals to a communication device 15 of the main controller 9, and these data are stored in a memory 14 of the main controller 9. Then, under the control of the controller 13 included in the main controller 9, the two types of data are compared with solenoid valve driving data transmitted from the main controller 9 to the sub-controller 8, and stored in the sub-controller 8. Amplifier 2
In order to display on the indicator 18 of the main controller 9 the quality of operation of the solenoid valve based on the operation state of the cylinder and the operation state of the cylinder, the wiring of the detection switch can be reduced and the operation of the solenoid valve can be detected satisfactorily. .

In such an operation, the cylinder 4A,
4B, 4C, 4D detection switches 7A, 7B, 7C, 7
D is provided with an address switch 33, and address data is set by the address switch 33, whereby the solenoid valves 1A,
Since the operations of 1B, 1C, 1D, 1E, 1F, 1G, and 1H can be detected, maintenance of the solenoid valve can be easily performed.

Further, a plurality of detection switches 7A, 7B, 7
Since the C and 7D and the communication controller 34 are connected in parallel by the communication lines 42 and 43, the electric wiring of the detection switches 7A, 7B, 7C and 7D is individually connected to the sub-controller 8 for each detection switch. As compared with the above, wiring work in the sub-controller 8 is reduced, and wiring of the detection switches 7A, 7B, 7C, 7D can be easily performed.

In one embodiment, the communicator 15 of the main controller 9 and the communicator 19 of the sub-controller 8 are connected by a communication line 20 to enable bidirectional communication via the communication line 20. Of course, this may be performed wirelessly.

[0018]

As described above, according to the present invention, a main controller provided with a communication device for transmitting solenoid valve drive data for driving a plurality of solenoid valves connected to a manifold as serial signals, A sub-controller having a communicator that receives a serial signal transmitted from the communicator and converts it into a parallel signal, and the solenoid valve is driven and operated by the received solenoid valve driving data of the sub-controller. A plurality of hydraulic actuators are provided with detection switches for detecting the operating states of these hydraulic actuators. These detection switches include an address switch that sets the address of the detection switch, a predetermined address based on the address data set by the address switch, and the address data. A comparator for comparing the address selection data with the address selection data, and transmitting the address selection data to the comparator and comparing the comparison result of the comparator with the address selection data. A communication controller for receiving a detection signal indicating the operation state of the hydraulic actuator output from the detection switch is provided in the sub-controller, and a plurality of detection switches and the communication controller are connected in parallel by a communication line. In addition, the wiring of the detection switch installed on the hydraulic actuator can be reduced and the operation of the solenoid valve can be detected satisfactorily.

Further, the address switch is provided in the detection switch of the hydraulic actuator, and the operation of the solenoid valve can be detected by setting the address data with the address switch, so that the maintenance of the solenoid valve can be easily performed.

Further, since the plurality of detection switches and the communication controller are connected in parallel by the communication line, the electric wiring of the detection switch is compared with the conventional one in which each detection switch is independently connected to the sub-controller. The wiring work in the inside is reduced, and the detection switch can be easily wired.

[Brief description of the drawings]

FIG. 1 is a block diagram of an electromagnetic valve control device showing one embodiment of the present invention.

FIG. 2 is an electric circuit diagram of the solenoid valve control device.

FIG. 3 is a block diagram of a conventional solenoid valve control device.

[Explanation of symbols]

1A, 1B, 1C, 1D, 1E, 1F, 1G, 1H solenoid valve 2 manifold 4A, 4B, 4C, 4D hydraulic actuator 7A, 7B, 7C, 7D detection switch 8 sub-controller 9 main controller 15, 19 communication Unit 33 address switch 34 communication controller 40 comparator 42, 43 communication line

Claims (1)

(57) [Claims] A main controller having a communication device for transmitting solenoid valve driving data for driving a plurality of solenoid valves connected to a manifold as a serial signal, and a serial signal transmitted from a communication device of the main controller. And a sub-controller having a communication device for receiving and converting the signal into a parallel signal. The hydraulic pressure is applied to a plurality of hydraulic actuators that operate by driving the electromagnetic valves according to the electromagnetic valve driving data received from the sub-controller. A detection switch for detecting the operation state of the actuator is provided, and these detection switches include an address switch that sets an address of the detection switch,
A comparator for comparing the address data set by the address switch with address selection data for selecting a predetermined address from the address data is provided, and the address selection data is transmitted to the comparator or the detection switch is turned on by the comparison result of the comparator. A communication controller for receiving a detection signal indicating an operating state of the hydraulic actuator to be output is provided in the sub-controller, and a plurality of detection switches and the communication controller are provided in parallel with a communication line. Solenoid valve control device.