JPH03140607A - Position detecting device for hydraulic actuator - Google Patents

Abstract

PURPOSE:To stabilize the action of an actuating member by recognizing the active range of the actuating member through one position detecting device and moreover an unstable output range which is a fixed range having a branch point between the active range and a nonactive range as a center. CONSTITUTION:A detecting circuit 3 provided in a cylinder device is formed of sensors 7a, 7b having a magnetic resistance element bridge structure, and generates minute voltage respectively induced by a permanent magnet built in a piston. The minute voltage is separated into two routes through amplifiers 8, 9, and the voltage in one of the routes is added and equalized in an adding section 10, and compared with a reference voltage of a reference voltage section 14 in comparing sections 11-13. Output from the comparing section 11 serves as a digital signal for an active range to turn on a green display lamp 16a, and output from the comparing section 12 or 13 is supplied as a digital signal for an unstable output range through an exclusive OR section 15 to turn on a red display lamp 16b. Thus output signals for the unstable output ranges at both stroke ends can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a position detection device for a fluid pressure operated device, and particularly for detecting the operating position of an operating member such as a piston in a fluid pressure operated device such as a cylinder device. The present invention relates to a technique that is effective when applied to a position detection device for a fluid pressure operated device in which an operating range and an unstable output range can be set.

[Prior Art] In general, in a fluid pressure operated device such as a cylinder device, in order to detect the operating position of a piston, which is an operating member, a position detection method using a detection element such as a reed switch or a magnetic resistance element is generally used. The device is in use.

For example, a light source such as a light emitting diode or a neon lamp is provided in the inner hole of the position detection device, and an operation display section such as a display window is provided on one side of the main body in correspondence with the light source. The structure is such that the location is displayed.

Furthermore, when the position detecting device is installed in a cylinder device, a two-color emitting position detecting device is used for the purpose of setting the position detecting device at an optimal operating position. This 2
In a position detection device that emits color light, for example, a red LED lights up in the operating range of the position detection device, and a green LED lights up in the optimum operating range.

The optimum operating range is defined as a range in which a stable output is always obtained within the operating range of the position detection device, and the operating range other than the optimum operating range is defined as an unstable output range in the detection range.

[Problems to be Solved by the Invention] However, in the prior art as described above, since the unstable output range of the position detection device is included in the operating range, although the stable output range of the operating range can be recognized, on the contrary, the unstable output range of the position detection device is included in the operating range. There is a problem in that the stable output range and the unstable output range in the non-operating range cannot be recognized.

Therefore, an object of the present invention is to set the operating range and unstable output range of the operating member of a fluid pressure operated device, and to make it possible to recognize the stable output range and unstable output range of the operating range and non-operating range. An object of the present invention is to provide a position detection device for a fluid pressure operated device.

The above and other objects and novel features of the present invention will become apparent from the description of this specification and the accompanying drawings.

[Means for Solving the Problems] Among the inventions disclosed in this application, a brief overview of typical inventions is as follows.

That is, the position detection device for a fluid pressure operated device of the present invention has the following features:
A position detection device that is mounted on a fluid pressure operated device and detects the operating position of an operating member of the fluid pressure operated device,
The operating range of the actuating member is recognized by two position detection devices, and the unstable output range of a predetermined range centered on the branching point between the operating range and the non-operating range is recognized.

Further, the operating range and the unstable output range can be identified by display means.

Furthermore, a first detection hand and a second detection means are arranged at a predetermined interval in the position detection device along the axial direction of the fluid pressure operated device, and the first and second detection means are disposed at a predetermined interval. 2
The operation range is set by adding the two detection outputs using the circuit configuration of the position detection device, and the unstable output range is set by performing an exclusive OR operation on the two detection outputs.

Further, the two position detection devices are configured to be able to set the operating range and unstable output range at both stroke ends of the fluid pressure operated device.

[Operation] According to the above-described position detection device for a fluid pressure operated device, when it is mounted on a fluid pressure operated device and detects the operating position of the operating member of the fluid pressure operated device, one position detection device detects the operating member. At the same time, it is possible to recognize the unstable output range of a predetermined range centered on the branch point between the operating range and the non-operating range. Thereby, an output signal in the stable output range in the operating range at both stroke ends can be obtained by using two output signals in the operating range and the unstable output range.

In addition, in this case, since the operating range and unstable output range can be identified by the display means, the unstable output range and stable output range between the operating range and non-operating range of the operating member of the fluid pressure operated device can be visually identified. can be judged through.

Furthermore, according to the position detecting device in which the first detecting means and the second detecting means are housed at a predetermined interval along the axial direction of the fluid pressure operated device, the first detecting means in the position detecting device and The operating range can be set by adding the two detection outputs of the second detection means depending on the circuit configuration of the position detection device, and the unstable output range can be set by performing an exclusive OR operation.

In this case, since the operating range and unstable output range at both stroke ends of the fluid pressure operated device can be set with one position detection device, the number of output signals and the number of wiring can be reduced.

[Example 1] Fig. 1 is a circuit configuration diagram showing a position detection device for a fluid pressure operated device according to an embodiment of the present invention, Fig. 2 is a circuit diagram showing a position detection device of the present embodiment, and Fig. 3 is an explanatory diagram showing the operation of the position detection device of this embodiment, FIG. 4 is a schematic diagram showing the state in which the position detection device of this embodiment is mounted on a fluid pressure operated device, and FIG. 5 is a diagram showing the position detection device of this embodiment. FIG. 3 is a circuit configuration diagram showing a modification of the device.

First, the configuration of a position detection device for a fluid pressure operated device according to this embodiment will be explained with reference to FIG.

The position detection device of this embodiment is, for example, a position detection device 2 mounted on a cylinder device (fluid pressure operated device) 1 as shown in FIG. 4, and includes a detection circuit 3 for detecting an operating position.
A signal processing circuit 4 that processes the signal detected by this detection circuit 3, an output circuit 5 that displays and outputs the detected operating position to the outside, and a power supply circuit 6 that generates a drive voltage for operating these circuits. It consists of

For example, as shown in FIG. 2, the detection circuit 3 includes a bridge-structured first sensor (
First detection means) 7a and second sensor (second detection means)
7b, which generates a minute voltage in response to the magnetic force of a permanent magnet (not shown) built into the piston (actuating member) of the cylinder device 1.

The signal processing circuit 4 includes two sets of amplifier sections 8 and 9 and an adder section 10.
．． Consisting of three sets of comparators 11, 12, 13, reference voltage section 14, and exclusive OR section 15, the minute voltage generated by the detection circuit 3 is amplified by the amplifier section 8.9 and separated into two systems. In one system, voltage-amplified analog signals are added by an adder IO. Further, the added analog signal is compared with the reference voltage of the reference voltage section 14 in the comparison section 11, and is made into a digital output signal within the detection range, that is, the operating range. Also, another system is
The voltage amplified analog signal is compared with the reference voltage of the reference voltage section 14 in the comparison section 12.13, and further subjected to an exclusive OR operation by the exclusive OR section 15, and output as a digital output signal in an unstable output range. It is something that will be done.

As shown in FIG. 2, the output circuit 5 includes a display section 16 including a green (G) indicator light (display means) 16a and a red (R) indicator light (display means) 16b, and an output circuit such as a transistor and a Zener diode. The green indicator light 16a is turned on by the output signal in the operating range of the signal processing circuit 4, and the red indicator light 16b is turned on by the output signal in the unstable output range. Furthermore, the output signals in the operating range and unstable output range are protected against surges by Zener diodes at the output terminals.
In addition, the signal is output digitally to the outside using a transistor output method.

As shown in FIG. 2, the power supply circuit 6 is composed of a power supply section 18 including a regulator, a capacitor, a choke coil, a diode, etc. The diode is used to prevent reverse connection, and the choke coil is used to prevent capacitive surges. There is.

Furthermore, the structure is such that a constant voltage stabilized by a regulator is applied to each circuit.

The position detection device 2 of this embodiment configured as described above is as follows:
As shown in FIG. 2, a resistor and a capacitor are connected between the terminals of each section and between the connections of each section, and the circuit configuration is such that the gain of the amplifier section 8.9 and the reference voltage of the comparison section 1112.13 are determined. There is. The above circuit configuration is constructed using a MIC (Monolithic Integrated Circuit) in consideration of miniaturization, for example.
dC1rcuit) and formed into one semiconductor chip.

Next, regarding the operation of this embodiment, the operation of the position detection device 2 will be explained based on FIGS. 1 and 3.

First, the piston of the cylinder device 1 moves along an axial force, and the first sensor 7a and the second sensor 7b are sensitive to the magnetic force of a permanent magnet (not shown) built into the piston, so that the first sensor 7a and the second sensor 7b are 1 sensor 7a and 2nd sensor 7b
Analog voltage signals v, and V2 are output from. And these analog voltage signals v and v2 are
The analog voltage signal va is input to the signal processing circuit 4 and is amplified by the amplifier section 8.9 with a voltage amplification degree of 1 and 2, and has a signal waveform as shown in FIG.
(=1·vI) and vb (-=2Hv2) are output.

Further, the analog voltage signals va and vb are input to the adder 10, and after being added, they are amplified by 1/2, so that the analog voltage signals va and vb are amplified by 1/2 (=1/2(
k+ -V, +L・V2)) is output. Then, by manually inputting it to the comparing section 11 and comparing it with the reference voltage vr of the reference voltage section 14, a digital voltage signal Vc having an operating range as shown in FIG. 3 is output. Furthermore, this digital voltage signal Vc is input to the output circuit 5, and at the same time as the green (G) indicator light 16a of the display section 16 lights up, the digital voltage signal Vc is digitally outputted to the outside from the output terminal as an operation signal.

On the other hand, these voltage signals va and vb are directly input to the comparison unit 12.13 in parallel with the input to the addition unit 10 and compared with the reference voltage vr, and furthermore, the exclusive OR unit 15
The digital voltage signal Vab in the unstable output range as shown in FIG.
is output. Furthermore, this digital voltage signal Vab is input to the output circuit 5, and at the same time as the red (R) indicator light 16b of the display section 16 lights up, the digital voltage signal Vab is digitally outputted to the outside from the output terminal as an unstable output signal.

Therefore, in the position detection device 2 of this embodiment, the signal processing circuit 4 includes the adder 10.3 sets of the comparators 11, 12, 1,
3 and the exclusive OR section 15, the minute voltages generated by the first sensor 7a and the second sensor 7b, which are the first and second detection means of the detection circuit 3, are added to the addition section. 10, and in parallel with the addition operation, the exclusive OR unit 15 performs an exclusive OR operation via the comparison units 12 and 13 to obtain output signals of the operating range and the unstable output range. Therefore, the indicator light 16a is a display means.

The operating range and unstable output range of the piston, which is the operating member of the cylinder device 1, can be identified by the color of the emitted light 16b.

In the position detection device 2 of this embodiment, as shown in FIG. By amplifying the voltage after the adding operation by the unit 10, it is possible to obtain output signals in the piston operating range and unstable output range of the cylinder device 1 in the same manner as described above.

[Embodiment 2] FIG. 6 is a circuit configuration diagram showing a position detection device for a fluid pressure operated device according to another embodiment of the present invention, and FIG. 7 is an explanatory diagram showing the operation of the position detection device of this embodiment. be.

As in the first embodiment, the position detection device of this embodiment includes a detection circuit 3 that detects the operating position, a signal processing circuit 4 that processes the signal detected by the detection circuit 3, and a signal processing circuit 4 that processes the signal detected by the detection circuit 3. It is composed of an output circuit 5 that displays and outputs externally, and a power supply circuit 6 that generates a drive voltage for operating these circuits.The difference from the first embodiment is that the output signals in the operating range at both stroke ends are separated. The point is that the circuit configuration can be obtained by

Therefore, the position detection device 2 of this embodiment has a circuit configuration as shown in FIG. Section 23.5 sets of comparison sections 24 to 28, reference voltage section 29
．． It is composed of two sets of OR section 3031 and exclusive OR section 32.

Then, an operation signal having a waveform as shown in FIG. 7 is outputted from each part.

That is, the first sensor (first detection hand) 7 of the detection circuit 3
The minute voltages 1 and V2 generated by the a and the second sensor (second detection means) 7b are voltage amplified by the amplifier section 19.20 and separated into three systems, one system is directly sent to the comparison section 24.25. Analog signal va (=kl I
V, ) and vb (=2・V2). In the other system, voltage-amplified analog signals va and vb are added by an adder 21 and then amplified by 1/2, and then sent to a comparator 26 as an analog signal VC (=1/2(k+ ' V+ + 2” 2
)) is human-powered.

Further, one line of the pond is subtracted by the subtracting unit 22, and one is directly inputted to the comparing unit 27 as an analog signal Vd (=1·V+kz·V2), while the other is inputted via the inverting amplifier unit 23. After being inverted and amplified, the analog signal ve (k2' v2
kl' v,) and the power of the people.

Furthermore, each of the analog signals va-ve manually input to the comparison sections 24 to 28 is compared with the reference voltage vr of the reference voltage section 29, and a digital voltage signal Va-ve as shown in FIG.
Ve is output. Then, one system is subjected to an OR operation by the OR section 30, and is output as a digital voltage signal Vcd of the detection range of one stroke end, that is, the operation range. Further, the other one system is subjected to an OR operation by another OR section 31, and is outputted as a digital voltage signal Vce in the operating range of the other stroke end. Furthermore, the other system is subjected to an exclusive OR operation by the exclusive OR section 32, and is output as a single digital voltage word Vab in an unstable output range.

In addition, these digital voltage signals Vcd, Vce, Va
b is manually inputted to the output circuit 5, and includes indicator lights (display means>16c, 16d) that emit light of different colors, for example, green (G), yellow (Y), and red (R).

At the same time that 16e lights up, the output terminal outputs digital signals to the outside as operation signals and unstable output signals at both stroke ends.

Therefore, according to the position detection device 2 of this embodiment, the signal processing circuit 4 includes the addition section 21, the subtraction section 22, the inverting amplification section 23 .
By having a circuit configuration including 5 sets of comparison units 24 to 28, 2 sets of OR units 30, 31, and exclusive OR unit 32, output signals of the divided operating range and unstable output range are Therefore, the indicator lights 16C to 16e
The operating range and unstable output range at both stroke ends of the piston, which is the operating member of the cylinder device 1, can be identified by the color of the emitted light.

Although the invention made by the present inventor has been specifically explained based on Examples 1 and 2 above, the present invention is not limited to the above-mentioned Examples, and can be modified in various ways without departing from the gist thereof. It goes without saying that there is.

For example, with regard to the position detection device 2 of Examples 1 and 2, a case has been described in which the circuit configuration is made into an MIC and is formed on one semiconductor chip, but the present invention is not limited to each of the above embodiments. For example, TTL, CMO
3. HIC (hybrid integrated circuit), which combines discrete components such as operational amplifiers and various electronic components.
Hybrid Intergrated C1rcui
t) It is also applicable to the case where it is formed into a structure.

Moreover, regarding the position detection device 2 of Examples 1 and 2,
Although the case has been described in which the signal processing circuit 4 has amplifier sections 8.9 and 19.20 with a voltage amplification degree of 1 and 2, the present invention is not limited to this. It is also possible to set it to −ik,=.

Furthermore, in Examples 1 and 2, the position detection device 2
Although the case has been described in which the fluid pressure operated device in which is mounted is the cylinder device 1, the present invention is not limited to the cylinder device 1, and can also be applied to fluid pressure operated devices such as a low reactor.

[Effects of the Invention] Among the inventions disclosed in this application, the effects obtained by typical inventions are briefly described below.

(1) In a position detection device that is installed in a fluid pressure operated device and detects the operating position of an operating member of the fluid pressure operated device, one position detection device can recognize the operating range of the operating member and at the same time Since it is possible to recognize the unstable output range in a predetermined range starting from the branch point between the operating range and the non-operating range, the two output signals of the operating range and the unstable output range can be used to detect the operation at both stroke ends. It is possible to obtain an output signal within a stable output range.

(2) Since the operating range and unstable output range can be identified by the display means, the unstable output range and stable output range between the operating range and non-operating range of the operating member of the fluid pressure operated device can be visually identified by the 6E. ata can be done.

(3) According to (1) and (2) above, the position detection device is capable of recognizing stable output and unstable output in the operating range and non-operating range, and is capable of stabilizing the operation at the time of detection. Obtainable.

(4) In the position detecting device, the first detecting means and the second detecting means are disposed within the position detecting device at a predetermined interval along the axial direction of the fluid pressure operated device. The operating range can be set by adding the two detection outputs of the second detection means using the circuit configuration of the position detection device, and the unstable output range can be set by performing exclusive OR operation. A single position detection device can set the operating range and unstable output range at both stroke ends of the fluid pressure operated device.

(5) According to the above (4), the number of output signals and the number of wires are reduced, so it is possible to obtain a position detection device that can reduce wiring and cost.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a position detection device for a fluid pressure operated device according to a first embodiment of the present invention, FIG. 2 is a circuit diagram showing a position detection device according to a first embodiment, and FIG. An explanatory diagram showing the operation of the position detecting device, FIG. 4 is a schematic diagram showing the state in which the position detecting device of Embodiment 1 is mounted on a fluid pressure operated device, and FIG. 5 is a modification of the position detecting device of Embodiment 1. A circuit configuration diagram shown,
FIG. 6 is a circuit configuration diagram showing a position detection device for a fluid pressure operated device according to a second embodiment of the present invention, and FIG. 7 is an explanatory diagram showing the operation of the position detection device according to the second embodiment. 1...Cylinder device (fluid pressure operated equipment), 2...
・・・Position detection device, 3 ・ ・ ・ ・ 4 ・ ・ ・ ・ 5 ・ ・ ・ 6 ・ ・ ・ 7 ・ ・ ・ 7 a ・ ・ 7 b ・ ・ 8 9 ・ ・ 0 ・ ・ ・・ 1.12゜ 4 ・ ・ ・ ・ 5 ・ ・ ・ ・ 6 ・ ・ ・ 6 a~16 7 ・ ・ ・ ・ 8 ・ ・ ・ 9 20 ・ 1 ・ ・ ・ ・ 2 ・ ・ ・ ・ 3 ・ ・・ ・ Detection circuit, signal processing circuit, output circuit, power supply circuit, sensor section, No. 1 sensor (first detection means), second sensor (second detection means), amplifier section, addition section, 3... comparison section , reference voltage section, exclusive OR section, display section, ・Indicator light (display means), output section, power supply section, amplifier section, addition section, subtraction section, inverting amplification section, 24-2 29 ・ 30, 3 32 ・・・Comparison section, ・Reference voltage section, ・OR section, ・Exclusive OR section.

Claims (1)

[Scope of Claims] 1. A position detection device that is mounted on a fluid pressure operated device and detects the operating position of an operating member of the fluid pressure operated device, wherein the one position detection device determines the operating range of the operating member. 1. A position detecting device for a fluid pressure operated device, characterized in that an unstable output range of a predetermined range centered on a branch point between the operating range and the non-operating range is recognized. 2. The position detection device for a fluid pressure operated device according to claim 1, wherein the operating range and the unstable output range are identified by display means. 3. A first detection means and a second detection means are arranged at a predetermined interval in the position detection device along the axial direction of the fluid pressure operated device, and the first and second detection means are arranged at a predetermined interval. The operation range is set by adding the two detection outputs using the circuit configuration of the position detection device, and the unstable output range is set by performing an exclusive OR operation on the two detection outputs. The position detection device for a fluid pressure operated device according to claim 1. 4. The position detection device for a fluid pressure operated device according to claim 1, wherein the one position detection device is configured to have an operating range and an unstable output range at both stroke ends of the fluid pressure operated device.