JPH06186033A - Measured quantity-angle converting device - Google Patents

Abstract

PURPOSE:To provide a measured quantity-angle converting device which is of a noncontact type and simple structure. CONSTITUTION:When an arm member 13 is rotated through a weight 12, a magnetic field generating member 7 rotates in one body with the arm member 13. The rotation of the magnetic field generating member 7 relatively rotates a structure coil 3 arranged in the member 7 within the magnetic field of the member 7 to alter the quantity of magnetic flux given to the coil 3. An electrical signal responding to the quantity of magnetic flux, namely the angle of rotation is obtained in the coil 3. The output of the coil 3 therefore corresponds to the measured quantity detected by the rotation of the arm member 13 through the weight 12. In this case, since the variation of the quantity of magnetic flux given to the coil 3 generates output, and the arm member 13 is formed in one body with the member 7, a measured quantity-angle converting device which is of a noncontact type and simple structure can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measurement amount angle conversion device suitable for application to, for example, an inclinometer, a liquid level gauge, and a tensiometer.

[0002]

2. Description of the Related Art A potentiometer, which is a variable resistor, is used as a measuring amount angle conversion device for measuring the rotation angle of an arm such as a conventional inclinometer or tensiometer. This potentiometer has a winding resistor and a slider.
The slider is attached to the rotary shaft of the arm of the inclinometer and the tensiometer, and the voltage is supplied to both terminals of the winding resistor, so that the output voltage of the slider contacting the winding resistor Is to obtain an electric signal according to the rotation angle of the arm.

[0003]

However, since this potentiometer has a structure in which the resistor and the contact element slide with respect to each other, the life cycle is relatively short, and contact failure occurs in a vibrating environment. However, there is a problem in that such problems are likely to occur. The present invention has been made in view of such problems, has a non-contact type and high reliability,
It is also an object of the present invention to provide a measurement amount angle conversion device having a simple structure.

[0004]

A measuring amount angle converting apparatus according to the present invention includes a magnetic field generating member 7 as shown in FIG.
In the magnetic field formed by the magnetic field generating member 7, a magnetic sensor 3 rotatably arranged relative to the magnetic field generating member 7, and an arm member 13 integrally attached to the magnetic field generating member 7. And a measurement amount detecting means 12 that is integrally attached to the arm member 13 and detects a measurement amount such as a state or an attribute of a measurement target, and is detected by the rotation of the arm member 13 through the measurement amount detecting means 12. The output corresponding to the measured amount is obtained from the output of the magnetic sensor 3.

[0005]

According to the measuring amount angle converting apparatus of the present invention, when the arm member 13 rotates through the measuring amount detecting means 12, the magnetic field generating member 7 rotates integrally with the arm member 13.
The rotation of the magnetic field generation member 7 causes the magnetic field generation member 7 to rotate.
The magnetic sensor 3 disposed in the inside rotates relative to the magnetic field, and the amount of magnetic flux received by the magnetic sensor 3 changes.
The magnetic sensor 3 obtains an electric signal according to the amount of magnetic flux, in other words, according to the rotation angle. Therefore, the output of the magnetic sensor 3 corresponds to the measured amount detected by the rotation of the arm member 13 through the measured amount detecting means 12. In this case, since the output is obtained by the change in the amount of magnetic flux received by the magnetic sensor 3 and the arm member 13 and the magnetic field generating member 7 are integrally configured, a non-contact type measurement amount angle conversion device having a simple structure. Is obtained.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the measurement amount angle conversion device of the present invention will be described below with reference to the drawings.

A. First Embodiment (Example Applied to Inclinometer) FIG. 1 is a partial sectional side view of an inclinometer according to this embodiment, and FIG.
Is a schematic cross-sectional view taken along the line AA, FIG. 3 is a side view showing a state in which the inclinometer shown in FIG. 1 is attached to a measurement target, and FIG. 4 is a front view of FIG.

In FIG. 1, reference numeral 1 is a main body, and a detection circuit, which will be described in detail later, is arranged in the main body 1. A cylindrical support 2 is fixed to the main body 1, and a saturable coil 3 as a magnetic sensor is fixed in the support 2. The material of the support 2 is a non-magnetic material such as SUS-304 or brass.

As shown in FIG. 5, the saturable coil 3 has a core 4 which is a thin plate of permalloy.
Two saturable coils 3A and 3B provided with No. 6 are provided. The output of this saturable coil 3 is a detection circuit (described later).
Is supplied to.

In FIG. 1, a screw groove 2A is provided on the tip side of the support 2. Further, a cylindrical case 9 is coaxially arranged so as to cover the support 2. The magnet 1 is arranged on the inner peripheral surface of the case 9 so that the north pole and the south pole face each other.
0 and 11 are fixed. Therefore, the magnets 10, 1
1 produces a DC magnetic field acting on the saturable coil 3. The case 9 and the magnets 10 and 11 form the magnetic field generating member 7. The material of the case 9 is preferably a magnetic material,
It need not be a magnetic material.

The case 9 has a relatively small diameter portion 9A,
A thread groove 9B is provided on the outer peripheral surface of the small diameter portion 9A. An arm member 13 to which a weight 12 (measured amount detecting means) is attached is inserted through the small diameter portion 9A.
The arm member 13 is integrally fixed to the case 9 by the nut 15 via the washer 14. The case 9, the arm member 13, and the nut 15 are integrally configured.

The case 9, the arm member 13 and the nut 1
The cylindrical member 16 is inserted through the central axis 21 of the No. 5, and the cylindrical member 16 is fixed to the top of the support body 3 by the washer 17 and the bolt 18. The threaded portion of the bolt 18 fits into the thread groove 2A of the support body 3, and the cylindrical member 16 and the support body 2 are integrally fixed. Therefore, the case 9, the arm member 13, and the nut 15 are arranged in the cylindrical member 16 with respect to the support 2.
It is configured to freely rotate relatively on the outer peripheral surface in the direction of arrow D with the shaft 21 as a rotation axis.

In using the inclinometer constructed as described above, the inclinometer is installed in the frame 19 as shown in FIGS.
When the frame 19 is tilted and the main body 1 and the support 2 having the saturable coil 3 are integrally tilted as shown in FIG. 4, the arm member 13 and the weight 12 are gravitated. It holds a position parallel to the direction, so it does not tilt. Therefore, the intersecting angle between the magnetic lines of force generated by the magnets 10 and 11 and the saturable coil 3 changes according to the tilt angle. Then, the saturable coils 3A, 3B
The inductance of changes. This change in inductance is supplied to the detection circuit 32 shown in FIG.

In FIG. 6, saturable coils 3A and 3B are shown.
The output terminal of is connected to the detection circuit 32. The detection circuit 32 has a pulsed voltage oscillator 34 having a period of about 40 μs and a pulse width of about 1 μs and a voltage amplitude of 30 v, and the output of the oscillator 34 is supplied to the saturable coil 3 through a transformer 35. 36, 36 are series resistors, 37, 37
Is a diode, 38, 38 is an output resistance, 39, 39, 4
0 is a capacitor, and this detection circuit 32 has an output terminal 3
An analog voltage output is generated at 3A and 33B. Explaining in detail the process in which the analog voltage output is generated, the saturable coils 3A and 3B generate a pulsed current from the oscillator 34 through the transformer 35.
It is in a state of being substantially magnetically saturated in opposite directions. When a DC magnetic field is applied to the core 4 in this state, the inductance of one saturable coil (for example, the saturable coil 3A) increases and the inductance of the other saturable coil (hence, the saturable coil 3B) decreases. To change.
Depending on the change of this inductance, the diodes 37, 3
The pulsed voltage supplied to the anode side of No. 7 changes, and the rectified voltage generated at the output resistors 38, 38 also changes accordingly. Since the changes in the rectified voltage occur in mutually opposite directions, the difference between the two rectified voltages becomes the output of the detection circuit 32. This rectified voltage becomes a sinusoidal voltage corresponding to the rotation of the saturable coil 3. In fact, a voltage approximately proportional to the ± 30 ° tilt of the frame 19 was obtained. Detection circuit 3
The voltage output of 2 is supplied to the processing device (not shown) through the multi-core shielded wire 41 (see FIG. 3), and the inclination angle is obtained from the processing device as numerical data.

Therefore, an output corresponding to the rotation amount of the weight 12 and the arm member 13 which are rotated relative to the inclination of the frame 19 is obtained from the detection circuit 32. In addition,
By connecting the interpolation circuit and the counter to the output of the detection circuit 32 in series, a digital output can be obtained in addition to the analog output.

In this case, in the example of the inclinometer shown in FIG. 1, an output is obtained by changing the amount of magnetic flux received by the saturable coil 3, and the arm member 13 and the magnetic field generating member 7 are integrally formed. Further, since the magnetic field generating member 7 and the saturable coil 3 are not in contact with each other, an inclinometer having high reliability and a simple structure can be obtained.

B. Second Embodiment (Example Applied to Liquid Level Gauge) FIG. 7 is a side view of a liquid level gauge according to this embodiment, and FIG. 8 is a front view showing a usage state of the liquid level gauge. 7 and 8, the parts corresponding to the inclinometers shown in FIGS. 1 to 4 are designated by the same reference numerals and detailed description thereof will be omitted. The liquid level gauges shown in FIGS. 7 and 8 are the inclinometers shown in FIGS. 1 to 4 in which the weight 12 as the measurement amount detecting means is replaced with a hollow spherical sill 51. Plow 51 support pipe 5
It is fixed to the arm member 13 through 2. Further, the main body 1 is fixed to a support tube 46 of the liquid level gauge through a mounting plate 45. In use, as shown in FIG. 8, the liquid level gauge is fixed at a predetermined position of the liquid 53 by the support tube 46,
Depending on the height of the liquid surface 54, the arm member 13, the support pipe 52, and the support 51 rotate integrally with the shaft 21 as a rotation axis.

Actually, when the rotation angle of the arm member 13 is θ, the output voltage of the detection circuit 32 (see FIG. 6) is V, and the maximum value of the output voltage V is Vm, the output voltage V is expressed as To be done.

[0019]

[Formula 1] V = Vm sin θ

As shown in FIG. 9, when the length from the shaft 21 to the weed 51 is L and the height of the liquid surface 54 corresponding to the angle θ is H, the relationship of the equation 2 is obtained.

[0021]

[Equation 2] H = L · sin θ

The relationships shown in Equation 1 and Equation 2 are obtained.

[0023]

[Equation 3] H = (L / Vm) · V

As understood from the equation 3, (L / Vm)
Is a constant, the liquid level height H is proportional to the output voltage V, and the nonlinearity of sin θ is removed. In fact, the angle θ is ±
It can be used as an accurate level gauge in the range of 60 °. After all, the liquid level height H is equal to the arm member 13 and the support tube 5
2 is proportional to the length L determined by the tow 51.

Also in this example, since the magnetic field generating member 7 and the saturable coil 3 are not in contact with each other, an inclinometer having a high reliability and a simple structure can be obtained.

C. Third Embodiment (Example Applied to Tensiometer) FIG. 10 is a front view showing a usage state of the tensiometer according to this embodiment, and FIG. 11 is a side view thereof. 10 and 11, the inclinometer shown in FIGS. 1 to 4 and the inclinometer shown in FIG.
Components corresponding to the liquid level gauge shown in FIG. 8 are designated by the same reference numerals, and detailed description thereof will be omitted. In the tensiometers shown in FIGS. 10 and 11, in the inclinometers shown in FIGS. 1 to 4 and the liquid level gauges shown in FIGS. It is a thing. The guide roller 55 is fixed to the arm member 13.

The main body 1 of the tensiometer constructed as described above is attached to a frame 56, and the frame 56 is provided with guide posts 57, 58 and a spring support post 59. On the other hand, a spring support post 60 is also provided on the other end side of the arm member 13. A spring 61 is hung between the post 59 and the post 60 to pull the arm member in the arrow G direction about the shaft 21. The guide rollers 57 and 58 are attached to the guide posts 57 and 58.
63 is attached. Then, when the thread 64 hung on these guide rollers 62, 63 is hung on the guide roller 55 constituting the tensiometer and the thread 64 is pulled in the direction of arrow E, the tension of the thread 62 and the arm member 13 The arm member 12 rotates in the direction of the arrow F and stops at a position where it balances with the force of the spring 61 that pulls the other end of the arm in the direction of the arrow G. In this embodiment, an electric signal corresponding to the change in the tension of the yarn 64 is obtained from the above-mentioned detection circuit 32 (see FIG. 6) through the saturable coil 3. The tension of the yarn 64 can be maintained at a predetermined value by servo-controlling the output signal of the detection circuit 32 to a predetermined constant value.

Although this embodiment shows a tensiometer for detecting the tension of the thread, the present invention is not limited to this, and can be applied to the measurement of the tension of the wire in the coil winding machine or the tension of the tape of the tape recorder. .

Also in the tensiometer for detecting the tension of the yarn, since the magnetic field generating member 7 and the saturable coil 3 are not in contact with each other, an inclinometer having high reliability and a simple structure can be obtained. To be

Further, the present invention is not limited to the above-described embodiments, and it goes without saying that various configurations can be adopted without departing from the gist of the present invention.

[0031]

As described above, according to the measurement amount angle converting apparatus of the present invention, when the arm member rotates through the measurement amount detecting means, the magnetic field generating member rotates integrally with the arm member. Due to the rotation of the magnetic field generating member, the magnetic sensor arranged in the magnetic field generating member relatively rotates in the magnetic field, and the amount of magnetic flux received by the magnetic sensor changes. In the magnetic sensor, depending on the amount of magnetic flux, in other words,
An electrical signal corresponding to the rotation angle is obtained. Therefore,
The output of the magnetic sensor corresponds to the measured amount detected by the rotation of the arm member through the measured amount detecting means. In this case, since the magnetic field generating member and the magnetic sensor are not in contact with each other, an inclinometer having high reliability and a simple structure can be obtained.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a configuration in which a measurement amount angle conversion device according to an embodiment of the present invention is applied to an inclinometer.

FIG. 2 is a sectional view taken along the line AA of the example of FIG.

FIG. 3 is a side view showing a state in which the inclinometer of FIG. 1 example is attached to a frame.

FIG. 4 is a front view of the example of FIG.

5 is a front view showing a detailed configuration of the saturable coil shown in FIG. 1. FIG.

6 is a circuit diagram of a detection circuit connected to the saturable coil shown in FIG.

FIG. 7 is a side view showing a configuration in which a measurement amount angle conversion device according to an embodiment of the present invention is applied to a liquid level gauge.

FIG. 8 is a front view showing an operation state of the example in FIG.

FIG. 9 is a diagram provided for explaining the operation of the examples of FIGS. 7 and 8;

FIG. 10 is a plan view showing a configuration in which a measurement amount angle conversion device according to an embodiment of the present invention is applied to a tensiometer.

11 is a side view of the example of FIG.

[Explanation of symbols]

 3 Saturable coil 7 Magnetic field generating member 12 Weight 13 Arm member 51 Ground 55 Guide roller

Claims (1)

[Claims] 1. A magnetic field generating member, a magnetic sensor arranged to be rotatable relative to the magnetic field generating member in a magnetic field formed by the magnetic field generating member, and integrally with the magnetic field generating member. It has an arm member to be attached and a measurement amount detection means which is attached integrally to the arm member and detects a measurement amount such as a state or an attribute of a measurement target, and is detected by the rotation of the arm member through the measurement amount detection means. A measured quantity angle conversion device, wherein an output according to the measured quantity is obtained from the output of the magnetic sensor.