JP3167492B2 - Solenoid control valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic control valve which controls a flow rate and a pressure of a fluid in accordance with a drive current supplied to a solenoid, and more particularly to a solenoid control valve which controls a solenoid drive current in response to an input signal. The present invention relates to an electronic apparatus equipped with an amplifier unit including an amplification unit to be controlled and a setting unit to set an input signal to the amplification unit.

[0002]

2. Description of the Related Art Such an electromagnetic control valve is disclosed in Japanese Patent Application No. 3-342108 filed by the present applicant. That is, the amplifier unit mounted on the electromagnetic control valve is provided with an amplifying unit that controls a solenoid drive current in accordance with an input signal, and a setting unit that sets an input signal to the amplifying unit. It has a memory whose contents can be rewritten, and an input signal to the amplifying section is output as an analog signal via a DA converter based on data from the memory.

[0003] A writing unit is provided separately from the amplifier unit, and key operation is performed by the writing unit to send write data of the memory to a setting unit of the amplifier unit to change and update the contents of the memory. Like that.

[0004]

However, in this case, since the data to be written into the memory is transmitted as a digital signal from the write unit to the amplifier unit, the structure of the write unit becomes complicated and expensive. There is a point. An object of the present invention is to solve such a problem and to realize an electromagnetic control valve capable of manufacturing a writing unit at low cost.

[0005]

According to the present invention, a writing unit is provided with a plurality of variable resistors, and a writing unit is detachably connected to a setting section of the amplifier unit so that an output voltage of the variable resistor is provided. Is provided in the setting unit of the amplifier unit, and an AD converter that converts a voltage signal input from the writing unit at the connection terminal into a digital signal for writing to the memory is provided.

[0006]

According to the configuration of the present invention, the output of the analog voltage by the variable resistor of the writing unit is AD-converted by the setting unit of the amplifier unit and is used for writing to the memory. Therefore, the writing unit can be simply configured to simply obtain an analog output by the variable resistor, and can be manufactured at low cost.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. An electromagnetic control valve 1 has an amplifier unit 5 mounted on a valve body 4 provided with solenoids 2 and 3. As shown in FIG. 2, when the solenoids 2 and 3 are not energized, the solenoid control valve 1 supplies a supply port P, a return port R,
When the neutral position X of the all-port block that closes all of the output ports A and B is set, and the solenoid 2 is energized, the switching position Y is set and the supply port P and the output port A corresponding to the drive current flowing through the solenoid 2 are set. And when the solenoid 3 is energized, the switching position Z is taken to obtain the flow area between the supply port P and the output port B according to the drive current flowing through the solenoid 3. It is a 4-port, meter-in control type flow direction control valve.

Reference numeral 6 denotes a writing unit detachably connected to a connection terminal 7 of the amplifier unit 5 via a cable 6A. Reference numeral 8 denotes a power line, and reference numeral 9 denotes a signal line.

The amplifier unit 5 includes an amplifying unit 12 for controlling a drive current flowing through the solenoids 2 and 3 according to input voltages from the signal lines 10 and 11, respectively, and an input voltage to the amplifying unit 12 via the signal lines 10 and 11. Setting unit 13 for setting
Is provided inside.

The setting section 13 includes a control device 14 including a CPU (not shown), a memory 15 whose storage contents can be rewritten, and a DA converter 16. This memory 1
In FIG. 5, a set current F1 for the solenoid 2 and a delay time t1 when increasing the current, a set current F2 and a decrease therefor are shown in FIG. 4 as a control pattern of the drive current to each of the solenoids 2 and 3 is shown. And a delay time t3 when decreasing the set current to zero, and a similar set current f1 and delay time T1 for the solenoid 3.
Data indicating the set current f2, the delay time T2, and the delay time T3 are sequentially written.

As shown in FIG. 4, the control device 14 turns off the signal lines S3 and S4 of the signal line 9 from the outside.
In the F state, when an ON signal is input from the signal line S1, a signal which gradually increases with a time delay of t1 and becomes a constant value equivalent to F1 based on the data of F1 and t1 from the memory 15 is output to the signal line S2. With the addition of the ON signal, the signal which gradually decreases with a time delay of t2 and becomes a constant value equivalent to F2 based on the data of F2 and t2 from the memory 15 is further converted into an OFF signal by the signal lines S1 and S2. Accompanying, memory 1
Based on the data of t3 from 5, the signal gradually decreasing to zero with the delay time of t3 is output to the DA converter 16 via the signal line 17 as a parallel digital signal, respectively. The digital signal from the control device 14 is converted into a corresponding analog voltage signal and the signal line 1
0 to the amplifying unit 12 so that the drive current of the solenoid 2 is controlled as shown in FIG.

Similarly, the signal line S in the signal line 9
In the state where 1 and S2 are OFF, a signal which gradually increases with a time delay of T1 and becomes a constant value equivalent to F1 based on the data of f1 and T1 from the memory 15 in response to the ON signal input on the signal line S3, Along with the addition of the ON signal by the signal line S4, a signal having a constant value equivalent to f2 which gradually decreases with a time delay of T2 based on the data of f2 and T2 from the memory 15 is further turned off by the signal lines S3 and S4. Based on the data of T3 from the memory 15 at the input, the controller 14 outputs a signal that gradually decreases to zero with a delay time of T3 as a parallel digital signal to the DA converter 16 via the signal line 18 and responds accordingly. The drive current of the solenoid 3 is controlled as shown in FIG. 4 by the amplifier 12 which inputs the voltage signal from the DA converter 16 through the signal line 11.

The setting unit 13 further has an AD converter 19 and a connection terminal 7 connected thereto. Reference numeral 20 denotes a connection terminal provided on the cable 6A of the writing unit 6, which is detachably connected to the connection terminal 7. The write unit 6 has variable resistors RF1 and R1, which set 10 data from F1 to T3 to be written to the memory, respectively.
t1, RF2, Rt2, Rt3, Rf1, RT1, Rf
2, RT2 and RT3 are installed.

Each of the variable resistors RF1 to RT3 is connected to a power line 2
The power lines 21 and 22 are connected in parallel between the power supply terminals 23 and the ground terminal 24 in the amplifier unit 5 by the connection between the connection terminals 7 and 20.
The mover V of each of the variable resistors RF1 to RT3 adjustably divides the voltage between the power supply lines 21 and 22 and adjusts the output voltage to AD.
It is connected to output to the converter 19.

Then, by connecting the connection terminals 7 and 20,
When the writing unit 6 is connected to the amplifier unit 5, the control device 14 of the setting unit 13 controls the variable resistors RF1 to RF1.
The output voltage of the RT 3 is sequentially converted into a parallel digital signal by the AD converter 19, fetched via the signal line 25, and written into the memory 15.

Next, the operation of this embodiment will be described. When the valve is operated, the connection terminals 7 and 20 are disconnected, and the writing unit 6 and the amplifier unit 5 are separated. In response to the sequential ON and OFF signal inputs from S1 and S2 on the signal line 9 as shown in FIG. 4, the drive current flowing to the solenoid 2 gradually increases to F1, then gradually decreases to F2, and further gradually decreases to zero. And the flow area from the supply port P to the output port A changes accordingly, so that the supply flow rate to the output port A changes according to the drive current.

Next, in response to the ON and OFF signals input from S3 and S4 on the signal line 9, the drive current to the solenoid 3 similarly increases gradually to f1, then gradually decreases to f2, and further gradually decreases to zero. Changes the supply flow rate from the supply port P to the output port B.

When such a flow pattern is changed, new data is written in the memory 15. That is, each of the variable resistors RF1 to RT3 of the writing unit 6
Is adjusted, and the writing unit 6 is connected to the amplifier unit 5 by connecting the connection terminals 7 and 20. As a result, a voltage corresponding to the adjustment position is output from the mover V of each of the variable resistors RF1 to RT3.
The control device 14 in the setting unit 13 of the variable resistor RF
This output voltage from 1 to RT3 is sequentially converted to an AD converter 19
The data is converted into a digital signal through the interface, fetched, and written into the memory 15.

Thus, the set current F1 and the increase delay time t1 for the solenoid 2 in the memory 15, the set current F2 and the decrease delay time t2, and the delay time t
3 are variable resistors RF1, Rt1, RF2, R
The data is changed to new data based on the output voltage from t2 and Rt3, and the set current f for the solenoid 3 is changed.
1, increase delay time T1, set current f2, decrease delay time T
2. The delay time T3 to zero current is also changed to new data based on the output voltages from the variable resistors Rf1, RT1, Rf2, RT2, RT3, respectively.

Then, when the connection terminals 7 and 20 are disconnected again, the writing unit 6 is separated from the amplifier unit 5 and the valve is operated, S1, S2 and S in the signal line 9 are switched.
3, the drive current of the solenoids 2, 3 is changed based on the data newly written in the memory 15 according to the signal input of S4, and a new flow pattern is obtained.

According to the present embodiment, the writing unit 6 simply outputs an analog voltage. Therefore, the writing unit 6 can be simply constructed by providing the variable resistors RF1 to RT3, and the writing unit 6 can be inexpensive. 6 is detachable from the amplifier unit 5 and can be used in common for a plurality of electromagnetic control valves 1, so that the electromagnetic control valve 1 can be inexpensive.

Although the flow direction control valve is shown in this embodiment, the present invention can be applied to a flow control valve or a pressure control valve, and the amplifier unit may be mounted not only on the valve body but also on a solenoid.

[0023]

As described above, according to the present invention, the writing unit can be simply constructed by using a variable resistor to simply obtain an analog voltage output and can be manufactured at low cost.
Since the writing unit is detachable from the amplifier unit and can be used in common for a plurality of electromagnetic control valves, the cost of the electromagnetic control valve can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a symbol diagram of a valve showing one embodiment of the present invention.

FIG. 3 is a configuration explanatory view showing one embodiment of the present invention.

FIG. 4 is an explanatory diagram showing a state of a change in a driving current in one embodiment of the present invention.

[Explanation of symbols]

2,3 solenoid 5Amplifier unit 6Write unit 7Connection terminal 12Amplifier 13Setting unit 15Memory 16DA converter 19AD converter RF1, Rt1, RF2, Rt2, Rt3, Rf1, R
T1, Rf2, RT2, RT3 variable resistors

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-2-42288 (JP, A) JP-A-2-113183 (JP, A) JP-A-63-106483 (JP, A) JP-A-61- 45179 (JP, A) JP-A-2-129482 (JP, A) JP-A-2-125282 (JP, U) JP-A-4-87081 (JP, U) JP-B-3-13458 (JP, B2) (58) Field surveyed (Int. Cl. ⁷ , DB name) F16K 31/00-31/11

Claims (2)

(57) [Claims] 1. An amplifier for controlling a drive current of a solenoid according to an input signal, and a memory for storing data for setting an input signal to the amplifier so that the stored content is rewritable. A setting unit that outputs an input signal to the amplifying unit as an analog signal via a DA converter based on the amplifier unit, and sets the data to be stored in the memory separately from the amplifier unit. In the electromagnetic control valve equipped with a writing unit to send to the unit, the writing unit is provided with a plurality of variable resistors, the writing unit is detachably connected to the setting unit of the amplifier unit, and the output voltage of the variable resistor is input. A connection terminal is provided, and a voltage signal input from the writing unit at this connection terminal is used for writing to the memory. An electromagnetic control valve, wherein an AD converter for converting to a digital signal is provided in a setting section of the amplifier unit. 2. A variable resistor for setting a solenoid drive current and a variable resistor for setting a delay time for increasing or decreasing the drive current until reaching the set drive current, as the variable resistors in the writing unit. The electromagnetic control valve according to claim 1, comprising: