JPH04105013A - Rotational synch signal sensing device, rotary part visibility device, and rotary part displacement measuring device - Google Patents

Abstract

PURPOSE:To measure displacement accurately by furnishing a locating device, which moves an optical type sensing device in the rotary shaft axial direction and fixes there, and installing a rectangular wave generating device which converts intermittence of the sensed beam of reflected light into a rectangular wave. CONSTITUTION:An optical type sensing device 7 is arranged confronting a reflex mark 19 on a rotary shaft 1 and moves in the axial direction of the rotary shaft 1 by a locating device 21 and fixed. The positions of this sensing device 7 moved by DELTAA1, DELTAA2 in the shaft axial direction by reference to the reference point 3 provided at the end of the rotary shaft 1, correspond to the rotational angles theta1, theta2. If reflected beams of light by the mark 19 are sensed in these positions of the sensing device 7 thus moved and fixed, the intermittence of the reflex light is converted into rectangular wave by a rectangular wave generating device 9, and accurate rotational synchronized signal is obtained free from influence of varying rotation period or angular speed. If pulse light in synchronization is projected onto the rotary shaft 1 by a stroboscope 11 on the basis of this rotation synchronized signal, a stationary image is obtained even in case the angular speed of the rotary shaft 1 varies.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention provides a rotation synchronization signal detection device for generating a rotation synchronization signal for a rotating body such as a rotating machine, and a rotating part visualization device using the same. and a rotating part displacement measuring device.

(Prior Art) In general, a stroboscope is often used in a rotating machine or the like to visualize a rotating part as if it were stationary. This method is a means of visualizing the rotating part as if it were stationary by shining pulsed light emitted by a stroboscope onto the rotating part and adjusting the emission frequency. The frequency is synchronized with the rotation of the rotating machine.

Conventionally, devices that visualize rotating parts using this method are:
It is constructed as shown in FIG.

That is, in FIG. 5, a reflective mark 5 is attached to a rotation angle reference point 3 provided on the outer periphery of a rotating part 1 of a rotating machine, and the reflection detected by an optical detector 7 placed opposite to the reflective mark 5. The intermittent light is converted into a rectangular wave by a rectangular wave generating device 9 that converts it into a rectangular wave. Then, this converted signal is detected as a rotation signal s1, and the stroboscope 1
It is used as a reference signal for the first light emission timing.

That is, the delay device 13 generates a rotation synchronization signal s2 delayed by a minute time Δt with respect to the detected reference signal, and the stroboscope control device uses this rotation synchronization signal s2 as the light emission timing of the stroboscope 11. 15, and the part 17 of the rotating part 1 at an arbitrary rotation angle can be visualized.

FIG. 6 is a graph for explaining the effects of each signal sl and s2.

The rotation synchronization signal S2 (see FIG. 6(c)), which is the light emission timing of the stroboscope 7, is delayed by a minute time Δt with respect to the rotation signal sl (see FIG. 6(a)).
This delay time Δt is calculated between a part 17 of an arbitrary rotation angle to be visualized on the rotating part 1 and a reference point 3 provided on the rotating part 1.
Δ1-tXθ/360 is obtained from the angle θ between the two and the rotation period t of the reference point 30 provided on the rotating part 1.

However, in reality, the delay balsa number ΔN is used instead of the delay time Δt. That is, starting from the detected rotation signal S1, the reference balsa signal s of the delay device 13 is
P (see FIG. 6(b)) and generates the rotation synchronization signal S2 from the count number N of the reference balsa signal sP and the above angle θ. Delayed balsa number ΔN−NXθ/360
I'm looking for. Therefore, the delay time obtained from the rotation period t and the delay time occurring at the delay balsa number ΔN are often different.

(Problem to be Solved by the Invention) As described above, the rotation synchronization signal when visualizing a part of a rotating part at an arbitrary rotation angle is generated by the delay time with the rotation signal. It is troublesome because it needs to be changed in accordance with changes in the cycle. In addition, the accuracy of the delay time is determined by the frequency error of the reference balsa signal of the delay device,
There are variations due to the division error that occurs when dividing the delay balsa. Furthermore, since the delay device is intended for constant angular velocity rotation, an angular error occurs when the angular velocity changes, making it impossible to generate a perfect rotation synchronization signal.

The present invention has been made in consideration of these points,
Unaffected by changes in rotation period or angular velocity, with no variation.
An object of the present invention is to provide a rotation synchronization signal detection device capable of detecting a signal completely synchronized with a part of a rotating part at an arbitrary rotation angle, and a rotating part visualization device and a rotating part displacement measuring device using the same. .

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the first invention includes a spiral reflective mark provided along the outer periphery of a rotating part, and a reflective mark arranged opposite to the reflective mark to provide a reflection light. , a positioning device that moves and fixes the optical detector in the direction of the rotation axis, and a rectangular wave generating device that converts the detected intermittent reflected light into a rectangular wave. This is a rotation synchronization signal detection device.

The second invention provides a spiral reflective mark provided concentrically on the end face of the rotating shaft of a rotating part, an optical detector arranged opposite to the reflective mark to detect reflected light, and the optical detector. This is a rotation synchronization signal detection device characterized by comprising a positioning device that moves and fixes the rotation synchronization signal in the radial direction, and a rectangular wave generation device that converts the detected intermittent reflected light into a rectangular wave.

A third invention is a rotating part visualization device that uses the rotation synchronization signal detection device described above to apply synchronized pulsed light to a rotating part to make a part at an arbitrary rotation angle appear stationary.

A fourth aspect of the present invention is that among the displacement signals sent according to the rotation angle of the rotating part using the rotation synchronization signal detection device,
This is a rotating part displacement measurement device that can measure only displacement signals at arbitrary rotation angles.

(Function) In the first and second inventions, the axial position of each part of the spiral reflective mark and the spiral reflective mark corresponds one-to-one to the rotation angle (0 to 360°) of the rotating part. . Therefore, the position in the direction of the rotational axis targeted by the optical detector has a one-to-one correspondence with the rotational angle.

Therefore, by moving and fixing the optical detector in the direction of the rotation axis, it is possible to obtain a rotation synchronization signal that is synchronized with a position at an arbitrary rotation angle, without using a delay device as in the conventional case.

Further, as in the third invention, by using the rotation synchronization signal detection device in the rotating part visualization device, an accurate and stable still image can be obtained.

Further, as in the fourth invention, by using the rotation synchronization signal detection device in the rotating part displacement measuring device, accurate and stable displacement measurement can be performed.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a first embodiment in which a rotation synchronization signal detection device is used as a rotating part visualization device.

In FIG. 1, the rotating part 1 has a cylindrical shape. A spiral reflective mark 19 is provided on the outer periphery of the rotating section 1 and is formed concentrically with the rotation axis of the rotating section 10 .

The reflective mark 19 is formed on at least one rotation (0 to 3 rotations) of the rotating part.
60°) is provided.

The optical detector 7 is placed facing the reflective mark 19. Then, the positioning device 21 moves the cylindrical rotating portion 1 in the axial direction along the generatrix and fixes it.

The optical detector 7 is connected to a square wave generator 9 and further connected to a stroboscope 11 via a stroboscope control device 15 . This stroboscope 11 is designed to irradiate the rotating section 1 with pulsed light.

FIG. 2 is a diagram illustrating the relationship between the rotation angle of the reflective mark 19 and the rotation axis direction of the optical detector 7.

In Fig. 2, one reflective mark is a cylindrical rotating part 1.
The outer periphery of is shown expanded on a plane.

As shown in FIG. 2, the axial direction (
The position (horizontal direction in the figure) corresponds one-to-one with the rotation angle (vertical direction in the figure). Therefore, by moving the optical detector 7 in the direction of the rotation axis, the optical detector 7 corresponds one-to-one with the rotation angle at any movement position.

This will be explained in detail below. The optical detector 7 is moved in the rotational axis direction with respect to the reference point 3 provided at the end of the rotating part 1.
The position moved by A1 corresponds to the rotation angle θ. Similarly, the position moved by ΔA2 corresponds to the rotation angle θ2. This correspondence is the same even when the rotation period of the rotating section 1 changes and when the rotation angle changes.

Therefore, if the optical detector 7 moved and fixed in this way detects the reflected light reflected from the reflective mark 19 at the targeted position, the intermittent waves of the detected reflected light are converted into rectangular waves, and the rotation Accurate rotation synchronization signals that are not affected by changes in period or angular velocity can be obtained.

Based on this rotation synchronization signal, if synchronized pulsed light is applied to the rotating part 1 using the stroboscope 11, the rotating part 1
Even if the angular velocity of the image changes, a stationary image can be shown. Similarly, even if the rotation period changes, the image can be left stationary without adjustment. Furthermore, since there is no need to use a delay device and a balsa signal as in the past, it is not affected by frequency errors or division errors of the pulsar signal, and a completely synchronized still image with no variations can be obtained. be able to.

FIG. 3 is a diagram showing a second embodiment of the rotating part visualization device.

In FIG. 3, a spiral reflective mark 25 is shown concentrically provided on the end face 23 of the rotating shaft of the rotating portion 1. As shown in FIG.

An optical detector (not shown) placed opposite to the spiral mark 25 is moved and fixed in the rotation radius direction by a positioning device (not shown).

The position of each part of the reflective mark 25 in the rotation radius direction corresponds one-to-one to the rotation angle of the rotating part position. Therefore, the target position of the optical detector also corresponds one-to-one to the rotation angle.

In this embodiment as well, the same effects as in the first embodiment can be obtained. Furthermore, according to this embodiment, even if the rotating part is not cylindrical and it is difficult to provide a spiral reflective mark (as in the first embodiment) along the outer periphery of the cylindrical shape, the rotation axis If the end surface is a flat surface, a curved surface close to a flat surface, a spherical surface, or a conical surface, a spiral reflective mark can be provided.

In each of the above embodiments, the rotation synchronization signal detection device has been described as being used as a rotating part visualization device, but the present invention is not limited to this, and the device may be used in a rotating part displacement measuring device.

A rotating part displacement measuring device measures a certain displacement of a rotating part during rotation and measures it as an electrical signal. A graph of this measured signal is shown in FIG.

In Fig. 4, the detected displacement signal sG (Fig. 4(
a)) is constantly being sent. Then, the value of the displacement signal sG is collected in synchronization with the rotation synchronization signal (FIG. 4(b)) sent from the rotation synchronization signal detection device. This makes it possible to measure only the amount of displacement at a certain rotation angle. When measuring the amount of displacement at another rotation angle, by moving the optical detector in the rotation synchronization signal detection device in the direction of the rotation radius, only the amount of displacement at the rotation angle corresponding to the moved position is measured. It can be measured (Figure 4 (C)).

In this way, the displacement signal sG is generated by the rotation synchronization signals sl' and 51'' before and after moving the optical detector.
It is possible to determine the times tt and t2 at which values are collected from
By synchronizing these times 1+ and 12 with the rotation of the rotating section, displacement at any rotation angle can be detected.

In each of the above embodiments, the reflective mark only needs to reflect light, and therefore may be flat.

However, the present invention is not limited to this, and the reflective mark may be formed of four parts or a convex part, and the detector may be used as a gap sensor. By making the reflective mark three-dimensional in this way, it is possible to prevent problems such as the reflective mark being worn out and disappearing due to wear on the surface of the rotating part.

Further, the positioning device may be one that manually moves and fixes the detector, but it can also move and fix the detector precisely using a computer. If precise movement and fixation are possible, the overall device can be downsized by making the reflective marks precise and small.

〔Effect of the invention〕

As explained above, according to the present invention, by moving the optical detector in the rotational axis direction or rotational radial direction with respect to the reflective mark, it is possible to detect any part of the rotating part without using a conventional delay device. A rotation synchronization signal for the rotation angle can be obtained.

Therefore, it is possible to obtain a perfect rotation synchronization signal without being influenced by the frequency error or division error of the balsa signal of the delay device. In addition, the position of the reflective mark in the direction of the rotation axis or radius of rotation has a one-to-one correspondence with the rotation angle, and this correspondence is not affected by changes in the rotation period or each speed, so even if such changes occur, errors will not occur. without the need for any adjustment.
Accurate rotation synchronization signals can be obtained. Further, by using the above-mentioned accurate synchronization signal in the rotating part visualization device and the rotating part displacement measuring device, an accurate and stable static image can be obtained, and accurate and stable displacement can be measured.

[Brief explanation of the drawing]

FIG. 1 is an overall schematic block diagram showing a first embodiment of a rotating part visualization device using a rotation synchronization signal detection device according to the present invention, and FIG. 2 is an exploded view showing the function of the reflective mark in FIG. 1. , FIG. 3 is a diagram showing a reflective mark according to the second embodiment of the rotating part visualization device, and FIG. 4 is a graph explaining the function of the rotating part displacement measuring device using the rotation synchronization signal detection device according to the present invention. FIG. 5 is an overall schematic block diagram showing a conventional rotating part visualization device, and FIG. 6 is a graph explaining the function of FIG. 5. 1... Rotation axis, 3... Reference point on the rotation axis, 5...
Reflective mark on reference point, 7... Optical detector, 9...
・Square wave generator, 11...Stroboscope, 13
... Delay device, 15... Stroboscope control device, 17... Visualization site on rotation axis, one... Spiral reflective mark, 21... Positioning device, 23... Rotation axis End face of 25... spiral reflective mark. Applicant's agent Sato - Itezu Itsuzu Ichizu

Claims (1)

[Claims] 1. A spiral reflective mark provided along the outer periphery of a rotating part, an optical detector arranged to face the reflective mark and detect reflected light, and this optical detector What is claimed is: 1. A rotation synchronization signal detection device comprising: a positioning device that moves and fixes the rotation axis in the direction of the rotation axis; and a rectangular wave generation device that converts the detected intermittent reflected light into a rectangular wave. 2. A spiral reflective mark provided concentrically on the end surface of the rotating shaft of the rotating part, an optical detector placed opposite to the reflective mark to detect reflected light, and a radial direction of the optical detector. A rotation synchronization signal detection device comprising: a positioning device that moves and fixes the rotation synchronization signal; and a rectangular wave generation device that converts the detected intermittent reflected light into a rectangular wave. 3. Using the rotation synchronization signal detection device according to claim 1 or 2, applying synchronized pulsed light to the rotating part,
A rotating part visualization device characterized by making a part at an arbitrary rotation angle appear stationary. 4. Using the rotation synchronization signal detection device according to claim 1 or 2, only the displacement amount signal at an arbitrary rotation angle is measured among the displacement amount signals sent according to the rotation angle of the rotating part. A rotating part displacement measuring device characterized by: