JPH07146118A - Part-dimension measuring device - Google Patents

Abstract

PURPOSE:To improve data processing speed and measurement accuracy by using line sensors. CONSTITUTION:A dolly 11 for putting and transporting a measuring object 1 and a plurality of line sensors 15 are arranged in the plane perpendicular to the moving direction of the dolly 11. Laser radiators 13 to irradiate laser lights spreading in sheat shape along the moving direction to the measuring location and an illuminator 14 are provided. Each detection signal from line sensors 15 for detecting the reflection light from the edge position of the measuring object 1 and line sensors 15 for detecting the sheet shape laser reflection light are input to an operator provided to obtain the angle in sight of the reflection light from each measuring location and position coordinates of the measuring location based on the positions of each line sensor 15 and each laser radiator 13 and the irradiation angles of laser lights from each laser radiator 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a member size measuring device for automatically measuring the size of a large structural member used in, for example, steel bridges, steel towers, sluices, and marine structures.

[0002]

2. Description of the Related Art Conventionally, an optical cutting method has been used as a method for automatically measuring the dimensions of large structural members used in steel bridges, steel towers, sluices, marine structures and the like.

In this light cutting method, as shown in FIG. 4, a plurality of sheet-shaped laser light sources 61 are arranged around a structural member, such as an H-shaped steel 51, which is an object to be measured, and light is irradiated on the surface thereof. A cutting line 62 is created, the light cutting line 62 is photographed in an oblique direction by a plurality of image pickup devices (for example, CCD cameras) 63, and the light cutting line 62 is captured as image data.
This is a method of analyzing the image data and measuring the cross-sectional shape of the H-section steel 51, that is, the outer dimension.

[0004]

However, according to the above-mentioned optical cutting method, since basically two-dimensional array data is handled, the time required to extract a portion required for measurement from the frame memory, and It has a drawback that it takes a long time to analyze two-dimensional data.

Further, when a CCD camera is used as an image pickup device, even if it is currently used for high-definition, it is 1280
The number of pixels is × 1024, which is also a drawback that the resolution in one direction is low compared to 5000 pixels of a one-dimensional line sensor.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a member size measuring device which can solve the above problems.

[0007]

In order to solve the above-mentioned problems, a member size measuring apparatus of the present invention comprises a movable carriage on which an object to be measured is placed and which is moved in a predetermined direction, and an orthogonal direction to the moving direction of the movable carriage. Arranging a plurality of line sensors in the plane to the position corresponding to the measurement point of the measurement object, a laser irradiator for irradiating the measurement point with a laser beam that spreads in a sheet shape along the moving direction of the movable carriage and An illuminator that illuminates the measurement point is provided, and the sheet-like laser reflection light from the measurement point on the predetermined line sensor and the measurement object surface that detects the irradiation reflected light from the edge position of the measurement object is detected. Each detection signal from another line sensor is input to obtain the expected angle of reflected light with respect to the optical axis on the side of each line sensor at each measurement point, and Based on the irradiation angle of the laser beam from the sub and position as well as the laser irradiator of the laser irradiator is obtained by including a computing unit for determining the position coordinates of the measurement points of the measurement object.

[0008]

According to the above structure, in measuring the external dimensions of the object to be measured, the reflected light emitted from the illuminator and the laser irradiator is detected by the line sensor, and the position coordinates of the predetermined measurement point are detected. Therefore, as compared with the case of using a two-dimensional sensor, the processing speed of data is improved and the measurement accuracy is improved.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In FIG. 1, reference numeral 11 denotes a movable carriage that is movable on a guide rail 12, and is for moving an object to be measured 1 such as an H-shaped steel and moving it in a predetermined direction at a predetermined speed. is there.

In the middle of the moving route of the moving carriage 11,
In order to measure the outer dimensions of the measuring object 1 placed on the upper surface thereof, a laser beam that spreads in a sheet shape along the moving direction A of the moving carriage 11, that is, along the longitudinal axis direction of the measuring object 1. 5, a laser irradiator 13 that irradiates the measurement point, an illuminator 14 that similarly illuminates a measurement point of the measurement target 1 with a normal light, and a plane orthogonal to the longitudinal axis direction of the measurement target 1. A plurality of one-dimensional line sensors (for example, ones composed of CCD) arranged 15
And are arranged. Of course, each of these line sensors 15
Is provided with a lens for image formation (not shown).

Then, a predetermined line sensor 15 for detecting the irradiation reflected light from the edge position of the measuring object 1 and another line sensor for detecting the sheet-like laser reflected light from the measuring point on the surface of the measuring object 1 are detected. Each detection signal from 15 is input to obtain an estimated angle of each reflected light with respect to the optical axis of the lens arranged in front of each line sensor 15 at each measurement point, that is, the measurement point, and the line sensor 15 and the laser irradiation. The object to be measured 1 based on the position of the device 13 and the irradiation angle of the laser light from the laser irradiation device 13.
An arithmetic unit (not shown) for obtaining the measurement position, that is, the position coordinates of the measurement point is provided.

Next, a method of detecting the position of a predetermined portion of, for example, H-section steel as the measuring object 1 with the above-mentioned configuration will be described. In addition, in this description, when measuring the surface dimension of the H-section steel 1, as shown in FIG. 2, the case where there are eight measurement points (-) will be described.

In this case, since the shape of the H-shaped steel 1 is bilaterally symmetric, a case of measuring, for example, four places (,,,) on the left side will be described with reference to FIG. First, an illuminator 14 for illuminating a normal light (see FIG. 1) is arranged at a distance, and two positions to be measured on the surface of the web 2 of the H-section steel 1 are measured.
First and second laser irradiators 13A and 13B for irradiating sheet-like laser light along the longitudinal axis of the H-shaped steel 1 respectively
Are arranged so as to be inclined at a predetermined angle with respect to the surface of the web 2. Of course, both laser irradiators 13A, 1
The laser beam emitted from 3B is arranged so as to be emitted to a predetermined measurement point. Further, in the plane orthogonal to the longitudinal axis, the first to third line sensors 15A, 15B,
15C is arranged, and the optical axis (optical axis on the line sensor side) a of the lens in the first line sensor 15A is arranged to be perpendicular to the surface of the web 2, and the second and third line sensors 15B and 15C are The optical axes (optical axes on the line sensor side) b and c of the respective lenses are the first line sensor 15
It is arranged at the upper and lower positions of A and inclined with predetermined angles β and γ with respect to the optical axis a of the first line sensor 15A. Further, the inclination angle of both the laser irradiators 13A and 13B with respect to the straight line parallel to the optical axis a of the first line sensor 15A is α.

Incidentally, as shown in FIG. 3, the first and second
Set the coordinate positions of the laser irradiators 13A and 13B to (X_P , Y
_P ), (X_Q , Y_Q ) And the 1st-3rd line sensor 1
Set the coordinate position of the lens of 5A to 15C to (X_A , Y_A ),
(X_B , Y_B ), (X_C , Y _C ), And for H-section steel 1
The coordinates of the measurement points in the₁ , Y
₁ ), (X₂ , Y₂ ), (X_Five , Y_Five ), (X₆ , Y
₆ ).

Then, by the first line sensor 15A,
Position of tip edge of flange 3 of H-section steel 1 and measurement
Each prospective angle (θ_A1), (Θ_A2),
(Θ _A5), (Θ_A6) Are detected respectively.

Next, similarly, the second and third line sensors 15B and 15C detect the expected angles (θ _B1 ) and (θ _C2 ) of the tip edge position of the flange 3. Then, as described above, the respective prospective angles respectively detected are input to the arithmetic device, and the position coordinates of the lens of each line sensor 15 and the position coordinates of each laser irradiator 13 and each laser irradiator which are input in advance are input. 13A,
Based on the inclination angle of the first line sensor 15A of 13B with respect to the optical axis a, the position coordinates of the edge position, which is the measurement location, and the measurement point are calculated.

For example, the position coordinates of measurement points are as follows.
It is calculated by Eqs. (1) and (2).

[0018]

[Equation 1]

Further, the position coordinates of the measurement points are as shown in (3) below.
And it is calculated by the equation (4).

[0020]

[Equation 2]

The other measurement points remaining ...
Can also be calculated by the same method as above.
In the description of the present embodiment, it is assumed that the laser light diffusely reflects at the measurement points ,,, but even when the light is specularly reflected, the laser light emitted from the laser irradiator 13A in FIG. On the other hand, by arranging the first line sensor 15B in the regular reflection direction, the position of the measurement point can be obtained.

[0022]

As described above, according to the configuration of the present invention, in measuring the outer dimension of the object to be measured, the reflected light emitted from the illuminator and the laser irradiator is detected by the line sensor, Since the position coordinates of a predetermined measurement point are obtained, the data processing speed is improved and the measurement accuracy is improved as compared with the case where a two-dimensional sensor is used as in the conventional case.

At the time of measurement, since the divergence direction of the sheet-like laser beam and the detection direction of the line sensor are orthogonal to each other, the detected data becomes the minimum necessary, and therefore the measurement efficiency is improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing a schematic configuration of a member dimension measuring device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing measurement points of a measurement object in the same example.

FIG. 3 is a diagram illustrating a member dimension measuring method in the example.

FIG. 4 is a schematic perspective view illustrating a dimension measuring method of a member in a conventional example.

[Explanation of symbols]

 1 Object to be Measured (H-Shaped Steel) 11 Moving Carriage 13 Laser Irradiator 14 Illuminator 15 Line Sensor

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Haruhiko Yoshida Inventor Haruhiko Yoshida 5-3-8 Nishikujo, Konohana-ku, Osaka City, Osaka Prefecture Hitachi Shipbuilding Co., Ltd. 3-28, Hitachi Shipbuilding Co., Ltd.

Claims (1)

[Claims] 1. A mobile trolley for placing an object to be measured and moving it in a predetermined direction, and a plurality of line sensors arranged in a plane orthogonal to the moving direction of the mobile trolley to correspond to the measurement point of the object to be measured. At the position to be provided, a laser irradiator that irradiates the measurement point with a laser beam that spreads in a sheet shape along the moving direction of the moving carriage and an illuminator that illuminates the measurement point, and from the edge position of the measurement object Input each detection signal from the other line sensor that detects the sheet-shaped laser reflected light from the measurement point of the predetermined line sensor and the measurement target surface that detects the irradiation reflected light,
The object to be measured is obtained based on the position of each line sensor and each laser irradiator and the irradiation angle of the laser light from each laser irradiator while obtaining the expected angle of the reflected light with respect to the optical axis of each line sensor at each measurement location. 2. A member dimension measuring device, comprising: an arithmetic device for obtaining the position coordinates of the measurement point of.