JPH05133822A - Optical axis horsepower meter - Google Patents

Abstract

PURPOSE:To enable an output of a torsion meter which is fixed to a rotary axis to be transmitted to a non-rotary side by light transmission by providing a plurality of light-emitting elements (light-emitting diode) on a rotary axis surface and then providing a plurality of light-reception elements opposing the light-emitting elements at a non-rotary side. CONSTITUTION:The title item is provided with a ring 11 for transmission signal which is fixed to a rotary axis and where a plurality of light-emitting elements 13, 13,... are placed at a specified spacing on an axis surface with the rotary axis as a center and a circuit 12 which controls lighting of a plurality of light- emitting elements which are provided at the ring by an output signal of a torsion meter main body 4 and is provided on a track of the ring 11 for transmitting signal. It is also provided with a light receiver 21 where a plurality of light-reception elements 22, 22,..., are placed side by side in a row over a width corresponding to at least a spacing of the light-emitting elements.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical system comprising a twisting meter main body having a light emitting means and a light receiving means at a predetermined interval on a rotary shaft, and a reflection mirror for forming an optical path for entering and exiting the twisting meter main body. In particular, the present invention relates to an optical shaft horsepower meter characterized by a data transmission mechanism of a main body of a torsion meter.

[0002]

2. Description of the Related Art A pair of rings are fixed to a rotating shaft at a predetermined interval, and one of the rings is provided with a main body made of a light emitting means and a light receiving means. 9 to 12 show the configuration of a conventional optical axial horsepower meter provided with a reflection mirror that forms an optical path.

Rings 2 and 3 are fixedly provided at an arbitrary distance in the longitudinal direction of the rotary shaft 1, a twisting gauge main body 4 is fixed to the ring 2, and a reflection mirror 5 is fixed to the ring 3. Are provided. FIG. 1 shows the internal structure of the main body 4 of the screw gauge.
It shows in 0.

The lower half part of the main body 4 of the torsion meter constitutes a light-transmitting part, a battery 45 for lamp drive is provided at the rear end, a lamp 47 is provided in front of it, and a condenser lens is provided at the front end. 48 are provided. Reference numeral 46 is a lead wire that connects the lamp 47 and the battery 45.

Further, the upper half of the torsion meter body 4 constitutes a light receiving portion, a magnifying lens 41 is provided at the front end, a light receiving sensor 42 is provided behind it, and an amplifier (amplifier) 4 is provided at the rear end.
3 is provided.

The light receiving sensor 42 is realized by a CCD (stored charge coupled device device) composed of a large number (for example, 5000) of semiconductor light receiving elements (photoelectric conversion elements) arranged in a horizontal row, and is connected to the amplifier 12 by a lead wire 44. ing. The detection output of the torsion meter body 4 is transmitted to the non-rotating side by the signal transmission means as shown in FIGS. 9 and 12.

That is, the amplifier (AMP) 43 of the main body 4 of the torsion meter
The detection signal of the light receiving sensor 42 amplified by is converted into an analog signal by the D / A (digital / analog) converter 91, and is transmitted via the V / F (voltage / frequency) converter 92 to the transmitting antenna (ANT). It is connected to 93. Above D
The / A converter 91, the V / F converter 92, and the transmitting antenna 93 are fixed to the rotary shaft 1.

On the other hand, on the non-rotating shaft side, a receiving antenna 94 is provided so as to face a transmitting antenna (ANT) 93, and an arithmetic unit (PRO) is provided via an F / V (frequency / voltage) converter 95. ) 96.

In the apparatus having the above-mentioned structure, the light emitted from the lamp 47 of the main body of the torsion meter 4 is condensed by the condenser lens 48, reaches the reflection mirror 5, and is reflected.
The light enters at 1, and is received by the light receiving sensor 42.

The light-receiving sensor 42 is composed of 5000 photoelectric elements, and when the light is irradiated, electric charges are emitted only to the element of the 5000 photoelectric elements that is exposed to the light, so that which element is exposed to the light. Whether or not it is detected. Since 5000 photoelectric elements are shifted and output at constant timings, it is possible to detect which photoelectric element is irradiated by the signal mode of electric output.

The electric signal output from the light receiving sensor 42 is amplified by an amplifier 43, then sent to a D / A converter 91 to be converted into an analog voltage, and further sent to a V / F converter 92 to generate a frequency signal. And is transmitted from the transmitting antenna 93.

The radio wave transmitted from the transmitting antenna 93 is received by the receiving antenna 94, converted into an analog voltage by the F / V converter 95, and the twist δ is analyzed by the calculator 96, and the rotation input separately. Horsepower is required along with speed.

The twist δ at this time is as shown in FIG.
The output difference between the two can be obtained by measuring when the load is not applied to the rotary shaft 1 (zero point) and when the load is applied.

[0014]

As described above, in the prior art, since the output signal of the torsion gauge is converted into a radio wave and transmitted to the non-rotating side, it is interfered with by another strong radio wave in the vicinity. , Transmission trouble (electromagnetic interference) occurs. Particularly in recent years, the number of devices using radio waves has been increasing, and the countermeasures against the above problems are strongly desired.

The present invention has been made in view of the above circumstances,
By transmitting the output of the torsion gauge fixed to the rotating shaft to the non-rotating side by optical transmission, the trouble occurrence at the stage of sending the torsion signal detected on the rotating shaft surface to the non-rotating shaft side is greatly reduced. It is an object of the present invention to provide an optical shaft horsepower meter that can be used.

[0016]

According to the present invention, in order to realize a mechanism for transmitting the output of a screw gauge fixed to a rotating shaft to a non-rotating side by optical transmission, a plurality of light emitting elements (light emitting devices) are provided on the rotating shaft surface. It is characterized in that a plurality of light receiving elements are provided on the non-rotating side so as to face the light emitting element.

That is, according to the present invention, in an optical shaft horsepower meter constructed by including a main body of a torsion meter and a reflection mirror, a plurality of optical axis horsepower meters fixed on the rotary shaft are provided on an axial surface centered on the same axis. Of the signal transmission ring, which is formed by arranging the light emitting elements at a predetermined interval, and a circuit for controlling lighting of a plurality of light emitting elements provided on the ring by an output signal of the main body of the screwdriver; A light receiver provided on the track and receiving the output light of the light emitting element, the light receiving element having a plurality of light receiving elements juxtaposed at least over a width corresponding to the interval between the light emitting elements. ..

[0018]

According to the output signal of the main body of the screw gauge, the plurality of light emitting elements provided on the signal transmission ring fixed to the rotating shaft are driven to light, and the light emitted from the light emitting elements is received by the non-rotating shaft side. The light is received by the container and output as a signal for twist measurement.

As described above, since the light receiving element receives the output of the twisting meter as the blinking signal of the light emitting element (light emitting diode), that is, the so-called optical transmission system, the transmission trouble is greatly caused as compared with the conventional radio wave system. Can be reduced.

[0020]

【Example】

 [First embodiment]

A first embodiment of the present invention is shown in FIGS.
In FIG. 1, the conventional technique described above (see FIGS. 9, 10, and 1) is used.
The same parts as those shown in 2) are designated by the same reference numerals, and the description thereof will be omitted.

In FIG. 1 to FIG. 3, the ring 2 to which the main body 4 of the screw is attached and the ring 3 to which the reflection mirror 5 is attached are separated from each other by an arbitrary distance in the longitudinal direction of the rotary shaft 1.
Fixed to.

A ring 11 for signal transmission is fixed in the vicinity of the ring 2 of the rotary shaft 1, and on one side surface thereof, light emitting diodes 13, 13, ... Are provided on the same circumference at substantially the same intervals.
Are provided, and these light emitting diodes 13, 13, ... Are connected to the amplifier 43 of the torsion meter main body 4 by the lead wire 12.

On the other hand, a light receiver 21 is provided on the non-rotating shaft side so as to face the ring 11. In the light receiver 21, a plurality of light receiving elements 22, 22, ... With a width corresponding to at least the distance between the light emitting diodes 13, 13 ,. It is provided in. That is, the plurality of light receiving elements 2
The length of 2, 22, ... is the light emitting diode 1
The arrangement is longer than the mounting interval of 3, 13, .... The light receiving elements 22, 22, ... Of the light receiver 21 are connected to a calculator 25 by a lead wire 24. The operation of the above embodiment will now be described. In the device having the above-mentioned configuration, when the light-receiving sensor 42 of the torsion meter body 4 is exposed to light, it is detected which element is exposed to light, as in the case of the above-described conventional technique.

A signal serially output from the light receiving sensor 42 for each pixel (photoelectric element) is a sequential ON / OFF signal (here, the sensor element is 5000
., The light emitting diodes 13, 13, ... Arranged in the ring 11 are controlled to blink.

The blinking light of the light emitting diode 13 is detected by the light receiving elements 22, 22, ... Of the light receiver 21, the blinking mode is sent to the calculator 25, and the light receiving sensor 42 of the main body 4 of the screw gauge 4 is detected. The photoelectric element number of the light receiving point in the light receiving point is obtained. By measuring and obtaining this processing when the rotating shaft 1 is not loaded and when it is loaded, the torsion δ is obtained, and the horsepower is obtained in combination with the rotation speed obtained separately.

With the above-described optical transmission system device configuration according to the first embodiment of the present invention, troubles at the stage of sending the signal of the twist detected on the rotating shaft surface to the non-rotating shaft side are greatly reduced. It [Second Embodiment] A second embodiment of the present invention will now be described with reference to FIGS.
An example will be described. 4 and 5 show a second embodiment of the present invention. In the drawings, the same parts as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

In the second embodiment shown in FIGS. 4 and 5, four light emitting diodes 3 adjacent to the signal transmission ring 31 are provided.
The light emitting units 33, 33, ... As a set of 3a, 33b, 33c, 33d are provided. The light emitting diodes 33a, 33b, 33c, 33d of each set are all connected to the amplifier 43 of the torsion meter body 4. The photoreceiver provided so as to face each light emitting diode of the ring 31 has the same configuration as that of the first embodiment.

In the torsion meter of the above construction, the signal (digital signal) detected by the torsion meter body 4 is converted into a blinking signal and all the light emitting units 33, 33,
The light emitting diodes 33a, 33b, 33c, 33d of ... Flash simultaneously. The blinking light is detected by the photodetector on the non-rotating shaft side, and is restored to the digital signal detected by the torsion meter main body 4. An arithmetic unit (not shown) can obtain the axial horsepower by combining the above data with the rotation speed of the rotary shaft 1 obtained by a different means. The device having the configuration shown in the first embodiment is

(1). A light emitting element (light emitting diode),
Since the light receiving element that receives the light is required to have a high facing accuracy, the light emitting plate provided with the light emitting element (light emitting diode) and the light receiving plate provided with the light receiving element must be manufactured and have high mounting accuracy.

(2). There is a problem that a transmission error occurs due to the vibration of the shaft and the vibration of the hull. for reference,
FIG. 6 shows the light receiving sensitivity with respect to the change in the light receiving angle of the light emitting diode. According to this, since the sensitivity is about 50% at ± 60 °, the practical range is about ± 45 °.

In contrast to the above-mentioned problems of the first embodiment, the second embodiment of the present invention has a plurality of light emitting units 33, 33, ... Light emitting diodes 33a, 33b, 33c, 33d
With this configuration, even if an error occurs in the opposition between the light emitting diode and the light receiving diode due to an installation error, vibration, or the like, a light receiving error is prevented, and reliability can be further improved. [Third Embodiment]

Both the first and second embodiments described above have a structure in which one set of torsion gauge is provided, but in the third embodiment, the rings 2 and 3 are respectively provided with an angle of 180 °. Two sets of twist gauges are provided. The configuration of the third embodiment is shown in FIG. In FIG. 7, on the rings 2 and 3, the torsion gauge main bodies 4A and 4B and the mirrors 5A and 5B are arranged to face each other at an angle of 180 °. In addition, the main body 4
The amplifiers A and 4B are light emitting units 33 and 3 respectively.
3, ... are connected in parallel.

The light emitting units 33a, 3 having the above structure
As shown in FIG. 8, the data sent by 3b, 33c, 33d, and the photodetector 21 are alternated between the screwdriver main bodies 4A and 4B, that is, 1CH (channel) data of the screwdriver main body 4A is first transmitted. , And then send 2CH data of the main body 4B of the screw gauge. This transmission method is repeated, and the output data of the two torsion gauges are continuously transmitted, and accurate data can be obtained by averaging the output data. Although only the data transmission of the torsion gauge has been described in the above-described embodiments, the invention can be applied to all data transmission devices from a rotating body to a rotated body.

[0035]

As described above in detail, according to the present invention, in an optical shaft horsepower meter constructed by including a main body of a torsion meter and a reflection mirror, a coaxial shaft is fixed to the rotary shaft. A signal transmission ring in which a plurality of light emitting elements are arranged at a predetermined interval on a central axial surface, and a circuit for controlling lighting of a plurality of light emitting elements provided in the ring by an output signal of the main body of the twist meter. And a light receiver provided on the orbit of the signal transmission ring, which receives the output light of the light emitting element, and in which a plurality of light receiving elements are juxtaposed over a width corresponding to at least the interval between the light emitting elements. With the configuration provided, it is possible to significantly reduce transmission troubles as compared with the conventional radio wave method.

[Brief description of drawings]

FIG. 1 is a side view showing a configuration of an optical shaft horsepower meter according to a first embodiment of the present invention.

FIG. 2 is an enlarged side view showing a part of the configuration of FIG.

FIG. 3 is a view taken along the line III-III in FIG.

FIG. 4 is a side view showing a configuration of an optical shaft horsepower meter according to a second embodiment of the present invention.

5 is a view from V to V in FIG.

FIG. 6 is a characteristic diagram showing a light receiving sensitivity with respect to a change in a light receiving angle of a light emitting diode.

FIG. 7 is a side view showing a configuration of an optical shaft horsepower meter according to a third embodiment of the present invention.

FIG. 8 is a time chart explaining the signal transmission sequence of the embodiment shown in FIG.

FIG. 9 is a side view showing a configuration of a conventional optical axial horsepower meter.

FIG. 10 is a cross-sectional view showing a configuration of a torsion meter main body.

FIG. 11 is a characteristic diagram showing the relationship between the amount (number) of light incident elements of the torsion meter main body 4 and the twist δ, and the output difference when a load is not applied to the rotating shaft (zero point) and when a load is applied.

12 is a circuit block diagram of the main body of the torsion meter shown in FIG.

[Explanation of symbols]

1 ... Rotation axis, 2, 3 ... Ring, 4, 4A, 4B, ... Torsion meter body, 5, 5A, 5B ... Reflection mirror, 11, 31 ... Signal transmission ring, 12, 24 ... Lead wire, 13, 13,
..., 33a, 33b, 33c, 33d, ... light emitting element (light emitting diode), 21 ... light receiver, 22, 22, ...
Light receiving element, 25 ... Computing unit, 33, 33, ... Light emitting unit.

Claims (1)

[Claims] 1. A pair of rings are fixed to a rotating shaft at a predetermined interval, one ring of which is provided with a tonometer main body composed of a light-emitting means and a light-receiving means, and the other ring is provided with the tonometer body for insertion and removal. In an optical axial horsepower meter provided with a reflection mirror forming an optical path, a signal fixed to the rotary shaft and having a plurality of light emitting elements arranged at predetermined intervals on an axial surface centered on the coaxial axis. A transmission ring, a circuit for controlling lighting of a plurality of light emitting elements provided on the ring by an output signal from the main body of the torsion meter, and a circuit provided on the orbit of the signal transmission ring to receive output light from the light emitting element. And a light receiver in which a plurality of light receiving elements are juxtaposed at least over a width corresponding to the interval between the light emitting elements, and the detection signal of the main body of the screw thread is optically transmitted to the non-rotating shaft side. And an optical shaft horsepower meter.