JPH0735531A - Optical axial twist meter - Google Patents

Abstract

(57) [Summary] [Purpose] Even if the circumference of the axis to be measured is narrowed due to various restrictions and the optimal inter-ring length cannot be secured and shortened, it is possible to accurately detect the amount of twist of the axis. An optical axial twist meter is provided. [Structure] A main body 4 in which a lamp 9 and a sensor 12 are arranged at one of a pair of rings, which are mounted at appropriate distances in the longitudinal direction of the axis for measuring the twist, respectively, is provided, and a concave mirror 14 is provided at the other side. The reflection mirror 5 with the
In the optical axial twist meter provided opposite to, the plane mirror 16 is mounted between the lamp 9 and the sensor 12 on the body 4 side, and the plane mirror 18 is provided on the side of the concave mirror 14 on the reflection mirror 5 side.
Is installed. However, these two plane mirrors 16, 18
Re-reflection of light causes the sensor 12
It is possible to prevent the detection amount from decreasing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical axial twist meter suitable for a marine prime mover axial twist meter.

[0002]

2. Description of the Related Art As a conventional optical axial twistmeter, those shown in FIG. 3 side view, FIG. 4 main body plan view, FIG. 5 reflection mirror front view and FIG. 6 reflection mirror sectional view are known. That is, in the above figure, two rings 2 and 3 are fixed to the shaft 1 at appropriate distances 1 in the longitudinal direction of the shaft 1, and the main body 4 is fixed to one ring 2 by a plurality of bolts 6. The reflection mirror 5 is fixed to the other ring 3 by a plurality of bolts 7, and the main body 4 and the reflection mirror 5 are installed so as to face each other. Then, on the upper surface of the main body 4, as shown in FIG.
11 are arranged side by side and fixed, a lamp 9 is fixed at the center of the rear end of the box 8, and a condenser lens 10 is fixed in front of it. The lamp 9 is connected to a power source (not shown). A sensor 12 is provided at the center of the rear end of the box 11.
Is fixed and a magnifying lens 13 is fixed in front of it, and the sensor 12 is composed of a large number of semiconductor photoelectric elements arranged side by side, and an unillustrated light spot detection amplifier is connected thereto. On the other hand, inside the reflection mirror 5, as shown in FIG. 6, the inner surface is formed into a spherical shape, and the concave mirror 14 is provided inside the reflection mirror 5 so as to be bonded thereto, and the direction thereof is adjusted by a plurality of bolts 15 and reflection is performed. It is fixed to the mirror 5.

In such an axial torsion meter, when no load is applied to the shaft 1 (generally this case is called the zero point),
As shown in the operation explanatory view of FIG. 7, the light emitted from the lamp 9 is reflected by the concave mirror 14 at the same reflection angle as the incident angle as shown by the solid line, and is projected to the point a of the sensor 12, and this point a The position of is detected by an amplifier (not shown).
On the other hand, when the shaft 1 is loaded and twisted, a relative displacement δ occurs between the two rings 2 and 3, so that the lamp 9
The emitted light is reflected by the concave mirror 14 at the same reflection angle as the incident angle as shown by the dotted line and projected onto the point b of the sensor 12, and the position of this point b is detected by an amplifier (not shown). , The distance between the points a and b can be detected. Then, as shown in the figure, the relative displacement δ between the two rings 2 and 3 caused by the twist is the length a between the points a and b →
It is half of b, and the torque and horsepower applied to the shaft 1 can be obtained by the following equation by detecting the length a → b between the points a and b. Q = πD ⁴ G · a → b / 2 ÷ 32l · r, SHP =
2πnQ / 75, where Q is torque, D is the diameter of the shaft 1, G is the lateral elastic modulus of the shaft 1, l is the length between the two rings 2 and 3, r is the optical axis of the concave mirror 14 from the center of the shaft 1. Up to n, and n is the rotation speed of the shaft 1.

However, in such an axial torsion meter, there is no limitation around the axis to be measured, and it is good if an optimal length of the ring length l can be secured, but the optimal ring due to various restrictions such as measurement on a narrow ship. If the interval length l cannot be secured and it is unavoidable to shorten it, the detection amount a → b becomes small, so that there is a problem that the measurement accuracy relatively decreases.

[0005]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above circumstances, and the periphery of the axis to be measured is narrowed due to various restrictions, and the optimum inter-ring length cannot be ensured and shortened. Even in such a case, it is an object of the present invention to provide an optical axial twist meter that can accurately detect the amount of twist of a shaft and prevent a decrease in measurement accuracy.

[0006]

Therefore, according to the present invention, a lamp and a sensor are arranged at an interval on one of a pair of rings that are respectively mounted at an appropriate distance in the longitudinal direction of a shaft for measuring a twist. In the optical axial tension meter, a reflection mirror having a main body and a concave mirror arranged on the other side is provided so as to face the main body, a flat mirror is mounted between the lamp and the sensor on the main body side, and the concave mirror on the reflection mirror side is attached. A flat mirror is attached to the side of the.

[0007]

In the optical axial twist meter of the present invention, the light reflected by the concave mirror of the reflection mirror is re-reflected by the flat mirrors provided on the main body side and the reflection mirror side, and introduced into the sensor of the main body. It is possible to prevent a decrease in the amount of detection in the sensor due to the shortening of the inter-ring length.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment of the optical axial twist meter of the present invention will be described. FIG. 1 shows the configuration of the axial twist meter, FIG. 1 (A) is a plan view of the main body, and FIG. FIG. 2 is a front view of the reflection mirror, and FIG. 2 is an explanatory view of the operation of the main axis twist meter. First, in FIG. 1A, the boxes 8 and 1 provided in the main body 4
A flat mirror 16 is provided between the front end portions of 1 and is fixed to the boxes 8 and 11, while in FIG.
On the block 17 fixed to the side portion of the reflection mirror 5, a plane mirror 18 is fixed to the side portion of the concave mirror 14.

Next, referring to FIG.
In the zero point when the load is not applied to the axis 1, the light emitted from the lamp 9 is reflected by the concave mirror 14 at the same reflection angle as the incident angle and strikes the plane mirror 16 as indicated by the solid line. It is reflected at the same reflection angle as the incident angle, hits the plane mirror 18, is reflected at the same reflection angle as the incident angle, and is projected to the point c of the sensor 12, and the position of this point c is detected by an amplifier not shown. It On the other hand, when a load is applied to the shaft 1 and a twist is generated, a relative displacement δ is generated between the two rings 2 and 3, and in this case, the trajectory of the light beam is as shown by the dotted line, that is, the light emitted from the lamp 9. The emitted light is projected onto the point d of the sensor 12, and the position of this point d is detected by an amplifier (not shown). Therefore, the length c → d between the points c and d can be detected.
Although d is enlarged to 3.5 times δ, this magnification can be arbitrarily selected as needed.

Thus, according to such an optical axial twist meter, the light reflected by the concave mirror 14 of the reflection mirror 5 is flat mirrors 16 and 1 provided on the main body 4 side and the reflection mirror 5 side, respectively.
By re-reflecting at 8 and introducing it to the sensor 12 of the main body 4, the sensor 12 accompanying the shortening of the length between the rings 2 and 3 is introduced.
It is possible to prevent the detection amount from decreasing.

[0011]

In summary, according to the present invention, a main body in which a lamp and a sensor are arranged at an interval on one of a pair of rings that are respectively mounted at appropriate distances in the longitudinal direction of the axis for measuring the twist. In an optical axial gyroscope provided with a reflecting mirror having a concave mirror arranged on the other side, the flat mirror is mounted between the lamp and the sensor on the main body side, and the side portion of the concave mirror on the reflecting mirror side is provided. By attaching a plane mirror to the, the circumference of the axis to be measured becomes narrow due to various restrictions and the optimal inter-ring length cannot be ensured, so even if the length is shortened, it is possible to accurately detect the amount of twist of the axis. The present invention is extremely useful industrially because it provides an optical axial twist gage capable of preventing a decrease in accuracy.

[Brief description of drawings]

FIG. 1 shows the configuration of an embodiment of an optical axial twist meter of the present invention,
FIG. 1A is a plan view of the main body, and FIG. 1B is a front view of the reflection mirror.

FIG. 2 is an explanatory view of the operation of the main axis torsion meter.

FIG. 3 is an overall side view of a known optical axial twist meter.

FIG. 4 is a plan view of a conventional main body.

FIG. 5 is a front view of a conventional reflection mirror.

6 is a sectional view taken along line VI-VI of FIG.

FIG. 7 is an explanatory view of the operation of a conventional axial twist meter.

[Explanation of symbols]

 1 axis 2 ring 3 ring 4 body 5 reflection mirror 9 lamp 10 condenser lens 12 sensor 13 magnifying lens 14 concave mirror 16 plane mirror 18 plane mirror

Claims (1)

[Claims] 1. A main body in which a lamp and a sensor are arranged at one of a pair of rings mounted at appropriate intervals in the longitudinal direction of a shaft for measuring a twist, and a concave mirror is arranged at the other. In the optical axial twist meter provided with the reflecting mirror facing the main body, a flat mirror is attached between the lamp and the sensor on the main body side, and the flat mirror is attached to the side portion of the concave mirror on the reflection mirror side. A characteristic optical axial twist meter.