JP3035032B2 - Optical shaft horsepower meter - Google Patents

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 screw meter main body having a light emitting means and a light receiving means and a reflecting mirror for forming an optical path for entering and exiting the screw meter main body at predetermined intervals on a rotating shaft. The present invention relates to a shaft horsepower meter, and particularly to an optical shaft horsepower meter characterized by a data transmission mechanism of a torsion meter body.

[0002]

2. Description of the Related Art A pair of rings are fixed at a predetermined interval to a rotating shaft, and one of the rings is provided with a screw meter main body comprising a light emitting means and a light receiving means, and the other ring is provided with a screw meter main body. FIGS. 9 to 12 show a configuration of a conventional optical axis horsepower meter provided with a reflection mirror forming an optical path.

Rings 2 and 3 are fixedly provided at an arbitrary distance in the longitudinal direction of the rotating shaft 1, and a screw meter main body 4 is fixed to the ring 2, and a reflection mirror 5 is fixed to the ring 3 respectively. It is provided. FIG. 1 shows the internal configuration of the screw meter main body 4.
0 is shown.

The lower half of the screw meter main body 4 constitutes a light transmitting section, a battery 45 for lamp drive is provided at a rear end, a lamp 47 is provided in front of the battery 45, and a condenser lens is provided at a front end. 48 are provided. 46 is a lead wire connecting the lamp 47 and the battery 45.

The upper half of the torsion meter main body 4 constitutes a light receiving section, an enlarged lens 41 is provided at the front end, a light receiving sensor 42 is provided at the rear, and an amplifier (amplifier) 4 is provided at the rear end.
3 are provided.

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

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

On the other hand, on the non-rotating shaft side, a receiving antenna 94 is provided 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 configuration, the light emitted by the lamp 47 of the torsion meter main body 4 is condensed by the condenser lens 48, reaches the reflection mirror 5 and is reflected therefrom, so that the magnifying lens 4
1 and is received by the light receiving sensor 42.

The light receiving sensor 42 is composed of 5000 photoelectric elements, and when light is irradiated, electric charges are emitted only to the irradiated elements out of the 5000 photoelectric elements. Is detected. Since each of the 5000 photoelectric elements is shifted and output at a fixed timing, it is possible to detect the number of the photoelectric elements irradiated by the electric output signal mode.

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

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

The twist δ at this time is, as shown in FIG.
By measuring the time when no load is applied to the rotating shaft 1 (zero point) and the time when the load is applied, the output difference between the two can be obtained.

[0014]

As described above, in the prior art, the output signal of the screw meter is converted into a radio wave and transmitted to the non-rotating side. , Transmission trouble (radio wave interference) occurs. Particularly, in recent years, the number of devices using radio waves has been increasing, and measures for the above-mentioned troubles are strongly desired.

The present invention has been made in view of the above circumstances,
By transmitting the output of the torsion meter fixed to the rotating shaft to the non-rotating side by optical transmission, the occurrence of trouble 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]

SUMMARY OF THE INVENTION The present invention provides a mechanism for transmitting the output of a screw meter fixed to a rotating shaft to the non-rotating side by optical transmission. Diode), and a plurality of light receiving elements are provided on the non-rotating side in opposition to the light emitting elements.

That is, the present invention relates to an optical shaft horsepower meter having a screw meter main body and a reflection mirror, wherein the optical shaft horsepower meter is fixed to the above-mentioned rotating shaft, and is provided on a shaft surface centered on the same axis. A signal transmission ring in which the light emitting elements are arranged at predetermined intervals, and a circuit for controlling lighting of a plurality of light emitting elements provided in the ring by an output signal of the screw meter main body; and A light receiver provided on a track for receiving output light of the light emitting element, wherein a plurality of light receiving elements are juxtaposed over at least a width corresponding to an interval between the light emitting elements. .

[0018]

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

As described above, since the light receiving element receives the output of the screw meter as a blinking signal of the light emitting element (light emitting diode), the so-called optical transmission method, transmission troubles are greatly reduced as compared with the conventional radio wave method. Can be reduced.

[0020]

【Example】

 [First embodiment]

A first embodiment of the present invention is shown in FIGS.
In FIG. 1, the above-mentioned prior art (FIGS. 9, 10,
The same components as those shown in 2) are denoted by the same reference numerals, and description thereof will be omitted.

1 to 3, a ring 2 to which a torsion meter main body 4 is attached and a ring 3 to which a reflection mirror 5 is attached are arranged at an arbitrary distance in the longitudinal direction of the rotation shaft 1 from each other.
Fixed to

A ring 11 for signal transmission is fixed in the vicinity of the ring 2 of the rotating shaft 1, while the light emitting diodes 13, 13,.
Are connected to the amplifier 43 of the screw meter main body 4 via 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,... Having a width at least corresponding to the interval between the light emitting diodes 13, 13,. It is provided in. That is, the plurality of light receiving elements 2
The length in which 2, 22, ... are arranged is the light emitting diode 1
The arrangement configuration is longer than the mounting intervals of 3, 13,.... The light receiving elements 22, 22,... Of the light receiver 21 are connected to an arithmetic unit 25 by lead wires 24. Here, the operation of the above embodiment will be described. In the device having the above-described configuration, when light strikes the light receiving sensor 42 of the screw meter main body 4, it is detected which element has hit the light, as in the case of the above-described prior art.

The signal serially output from the light receiving sensor 42 for each pixel (photoelectric element) is sequentially turned on / off by the amplifier 43 (here, the sensor element is 5000).
, And is converted into a 13-bit digitally coded signal), and the light emitting diodes 13, 13,...

The blinking light of the light emitting diode 13 is detected by the light receiving elements 22, 22,... Of the light receiver 21, and the blinking mode is sent to the arithmetic unit 25, and is displayed on the surface of the light receiving sensor 42 of the screw meter main body 4. The photoelectric element number of the light receiving point at the light receiving point is obtained. This processing is measured and obtained when the rotating shaft 1 is not loaded and when the rotating shaft 1 is loaded, whereby the torsion δ is obtained, and the horsepower is obtained in combination with the separately obtained rotation speed.

With the above-described apparatus configuration using the optical transmission system according to the first embodiment of the present invention, the trouble in the step of transmitting the torsion signal detected on the rotating shaft surface to the non-rotating shaft side is greatly reduced. You. Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIGS.
An embodiment will be described. FIGS. 4 and 5 show a second embodiment of the present invention. In the drawings, the same parts as those of the first embodiment are denoted by the same reference numerals and the description thereof will be omitted.

In the second embodiment shown in FIGS. 4 and 5, four adjacent light emitting diodes 3 are connected to a ring 31 for signal transmission.
The light emitting units 33, 33,... Each having 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 screw meter main body 4. The light receiver provided to face each light emitting diode of the ring 31 has the same configuration as that of the first embodiment.

In the screw meter having the above configuration, the signal (digital signal) detected by the screw meter body 4 is converted into a blinking signal, and all the light emitting units 33, 33,
.. Light-emitting diodes 33a, 33b, 33c, 33d blink simultaneously. The blinking light is detected by the light receiver on the non-rotating axis side, and is restored to a digital signal detected by the screw meter main body 4. It should be noted that an arithmetic unit (not shown) can obtain shaft horsepower in accordance with the above data and the rotation speed of the rotating shaft 1 obtained by another means. The apparatus having the configuration shown in the first embodiment described above

(1). A light emitting element (light emitting diode),
Since a high facing accuracy of the light receiving element that receives the light is required, a light emitting plate provided with a light emitting element (light emitting diode) and a light receiving plate provided with the light receiving element and high mounting accuracy are required.

(2). There are problems such as transmission errors occurring due to shaft vibration and hull vibration. 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, the sensitivity is about 50% at ± 60 °, so that the practical range is about ± 45 °.

In contrast to the problem of the above-described first embodiment, the second embodiment of the present invention comprises 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]

In both the first and second embodiments described above, a single screw meter is provided, but in the third embodiment, the rings 2 and 3 are provided at an angle of 180 ° on the rings 2 and 3, respectively. Two sets of screw gauges are provided. FIG. 7 shows the configuration of the third embodiment. In FIG. 7, on the rings 2 and 3, the screw meter main bodies 4A and 4B and the mirrors 5A and 5B are arranged to face each other at an angle of 180 °. In addition, screw meter body 4
The amplifiers A and 4B are respectively light emitting units 33 and 3
3, ... are connected in parallel.

The light-emitting units 33a, 3 having the above configuration
As shown in FIG. 8, the data transmitted by 3b, 33c, 33d and the light receiver 21 are alternately transmitted between the screw meter main bodies 4A and 4B, that is, first, 1CH (channel) data of the screw meter main body 4A is transmitted. Then, the 2CH data of the screw meter main body 4B is sent. This transmission method is repeated, and the output data of the two screw meters is continuously transmitted. By averaging the output data, accurate data can be obtained. In the above embodiment, only the data transmission of the torsion meter has been described, but the present invention can be applied to all data transmission devices from a rotating body to a rotating body.

[0035]

As described above in detail, according to the present invention, in an optical shaft horsepower meter having a torsion meter main body and a reflection mirror, the optical shaft horsepower meter is fixed to the above-mentioned rotating shaft and coaxial. A signal transmission ring in which a plurality of light-emitting elements are arranged at predetermined intervals on a central axis plane, and a circuit for controlling lighting of the plurality of light-emitting elements provided in the ring by an output signal of the screw meter body And a light receiver provided on the track of the signal transmission ring and receiving the output light of the light emitting element, wherein a plurality of light receiving elements are juxtaposed over at least a width corresponding to an interval between the light emitting elements. With this configuration, transmission troubles can be greatly reduced as compared with the conventional radio wave system.

[Brief description of the 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. 1;

FIG. 3 is a view taken in the direction of arrows III to III in FIG. 2;

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

FIG. 5 is a view as seen from arrows V to V in FIG. 4;

FIG. 6 is a characteristic diagram illustrating 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 for explaining a signal transmission order of the embodiment shown in FIG. 7;

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

FIG. 10 is a sectional view showing a configuration of a screw meter main body.

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

FIG. 12 is a circuit block diagram of the screw meter main body shown in FIG. 10;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Rotating shaft, 2,3 ... Ring, 4,4A, 4B ... Toximeter main body, 5,5A, 5B ... Reflection mirror, 11,31 ... Ring for signal transmission, 12,24 ... Lead wire, 13, 13,
.., 33a, 33b, 33c, 33d,... Light emitting element (light emitting diode), 21.
Light receiving element, 25 arithmetic unit, 33, 33, light emitting unit.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-63400 (JP, A) JP-A-1-1117543 (JP, U) JP-A-57-174695 (JP, U) JP-A-57-74695 106341 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) G01L 3/08

Claims (3)

(57) [Claims] 1. A pair of rings are fixed at a predetermined interval to a rotation axis, and one of the rings is constituted by a light emitting means and a CCD in which a large number of light receiving elements are arranged in a line, and the position of incident light is determined. An optical shaft horsepower meter comprising: a screw meter main body comprising light receiving means for outputting as a digitally coded signal; and a reflecting mirror forming an input / output optical path of the screw meter main body on the other ring. A signal transmission ring fixed to a shaft and having a plurality of light emitting elements disposed at predetermined intervals on a shaft surface centered on the same axis, and a plurality of light emitting elements provided on the ring are separated from the screw meter body. A circuit for controlling lighting by the obtained digitally coded signal;
A light receiver provided on a track of the signal transmission ring and receiving the output light of the light emitting element, wherein a plurality of light receiving elements are juxtaposed over at least a width corresponding to a distance between the light emitting elements. A plurality of light emitting elements provided on the signal transmission ring are controlled to be turned on and off by a digitally coded signal obtained from the main body of the screw meter, and the detection signal of the main body of the screw meter is not transmitted by digitally coded optical transmission. Optical shaft horsepower meter characterized by transmitting to the rotating shaft side. 2. The optical shaft horsepower meter according to claim 1, wherein a plurality of sets of light emitting units each including four light emitting diodes are arranged at predetermined intervals on the signal transmission ring. 3. One of the rings fixed to the rotating shaft has
Two screw meter bodies are provided at an angle of 80 °, and the other ring fixed to the rotating shaft is provided with two screw meter bodies corresponding to the screw meter body.
2. The optical shaft horsepower meter according to claim 1, wherein two reflection mirrors are provided.