JPH06186001A - Detecting method for shape strain of body being rectangular in its plane - Google Patents

Abstract

PURPOSE:To provide a method which can detect the shape strain of a rectangular body in noncontacting state through comparatively inexpensive equipment in a process where the rectangular body intermittently moves with a fixed interval. CONSTITUTION:A body 2 being rectangular in its plane is moved on a conveyor 3 with its one longitudinal end face 2a regulated in its passing position. Television cameras 5, 6 are respectively installed above or below both the end faces 2a, 2b in a longitudinal direction to intermittently photograph a part of the moving body. The area of the body photographed by the television camera is processed by an image processor 9, and output data thereof are inputted into a computer controller 10 and compared with reference data previously inputted in the computer controller 10 to be judged. A judgement signal issued from the computer controller 10 is fed back to the actuator 11 of the conveyor 3 to stop the conveyor. Thus the body being distorted in its form can be removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting a plane shape distortion of a plane rectangular object moving on a conveyor.

[0002]

2. Description of the Related Art Conventionally, a television camera, an image processing device and a computer control device have been used as a so-called non-contact detection method for detecting the width of a belt-like object moving on a conveyor without touching the sensor. There is a way to do it. This method is used to detect the width of an object that should not come into contact with the sensor, or if the object has contact with the sensor because the surface of the object has irregularities, the sensor picks up noise. Is an excellent method.

[0003]

However, in this method, an object whose plane is rectangular as shown in FIG. 2, for example, a long object such as a radiation aerated concrete (ALC) panel is sequentially arranged at predetermined intervals. When applied to a method of detecting the width of the object in a moving process such as moving on a conveyor, the space of the interval also enters the field of view of the TV camera, and it is input to the computer as noise. There is a problem. The present invention is to provide a method for detecting the surface shape of a long object without such problems.

[0004]

In order to solve the above-mentioned problems, the present invention (a) moves an object whose plane is rectangular on a conveyor while regulating the passage position of one end face in the longitudinal direction. (B) intermittently photographing a part of the moving object by fixing a television camera above or below both end faces in the longitudinal direction, respectively.
(C) The area of the object photographed by the television camera is processed by an image processing device, and its output data is input to a computer control device for comparison and judgment with reference data previously input to the computer control device. ,
(D) Means is adopted in which the determination signal output by the computer control device is fed back to the actuator of the conveyor.

[0005]

Function: An object whose plane is rectangular is moved on the conveyor. At that time, the object is moved while regulating the passing position of the one end face in the longitudinal direction. Then, the magnitude of the lateral width of the object is manifested as the advancing / retreating of the one end face in the lateral width direction on the other one end face side in the longitudinal direction. A television camera is installed above or below both end surfaces in the longitudinal direction of the object, and the camera captures a part of the moving object. At this time, the object is photographed intermittently using a shutter so that the object is not photographed when it is not within the field of view of the camera.

The image of the object taken by both television cameras is processed by the image processing device as its brightness, and its output data is input to the computer control device as a quantity of electricity. The computer controller uses the width data of an object with a normal shape as the reference data (electric quantity).
, The computer control device is caused to compare and judge the sum of the output data and the size of the reference data. Then, the determination signal is output as an electric signal from the computer control device.

This signal is the sum of the areas of the parts of the objects photographed by both TV cameras and the sum of the areas of the parts of the objects which are similarly photographed by the TV cameras for the elongated object having the standard shape. The signal is output by discriminating whether or not the difference between and is within a predetermined range. When this signal is input to the actuator of the conveyor and the difference between the two is larger than a predetermined value, the actuator is operated to stop the conveyor or the object is discharged from a predetermined movement route and treated as a defect of the process.

[0008]

Next, an embodiment in which the present invention is applied to a method for detecting a shape distortion of an ALC panel as a rectangular object will be described in detail. As shown in FIG. 1, in the present embodiment, the present invention is dispensed from the processing step A and the processing step of grooving the surface of the ALC panel 1 or grinding the peripheral edge face. It is applied to the inspection step B for inspecting the shape distortion of the processed and processed ALC panel 2.

The unprocessed ALC panel 1 and the processed panel 2 are ground while being moved on the conveyor 3 having a large number of rollers, and the shape distortion is inspected. In the inspection step B, passage position regulating means 4 is provided so that one end face 1a in the longitudinal direction of the processed panel 2 always passes a predetermined position. This is the processed ALC shown in FIG.
The width W is almost the same at any position in the longitudinal direction as in the panel 2, but it is possible to surely detect the shape distortion when the horizontal width W is parallel and curved and is not a perfect rectangle. This is because

Two television cameras 5 and 6 are installed above (or below) both end surfaces 2a and 2b in the longitudinal direction of the processed ALC panel 2, and a part of the processed ALC panel 2 is moving on the conveyor 3. Can be photographed, but in this embodiment, the processing ALC 2 is installed at a predetermined distance D in the longitudinal direction. By doing so, one image processing device to be described later can receive image information from the TV cameras 5 and 6 with a time lag, and two image processing devices corresponding to the number of TV cameras are installed. There is no need to do it.

Further, in the inspection step B, a leading edge passage detection sensor 7 for detecting whether or not the processed ALC panel 2 has entered the inspection step B is located at a preceding position of any of the television cameras 5 and 6, and the panel 2 is in the inspection step. A trailing edge passage detection sensor 8 for detecting whether or not the sheet has passed B is provided.

An image processing device 9 is provided outside the above two steps.
The image information from the television cameras 5 and 6 is input to the apparatus through the circuits x and y, and the passage start / end signals from the front and rear passage detection sensors 7 and 8 are input through the circuits a and b. It is supposed to be done. Then, the processing A is carried out in the inspection process B through the tip passage detection sensor 7.
In response to the passage start signal that the LC panel 2 has entered, the two TV cameras 5 and 6 start photographing the processed ALC panel, and the processed ALC panel 2 is paid out from the inspection process B through the rear end passage detection sensor 7. Upon receiving the passage end signal, the two TV cameras 5 and 6 finish photographing the processed ALC panel.

Of course, during this period, the image processing device 9 alternately receives the image information from the two television cameras 5 and 6, and as the image information, the visual field of the television camera is captured as shown in FIGS. 4A and 4B. Part of the processed ALC2 (shown with diagonal lines) and other parts

Is input to the image processing device 9 as a distribution of lightness. In the image processing device 9, if the image of the processed ALC portion is inputted with higher lightness than the image of the other portion, the lightness distribution curves g and h are as shown in FIGS. The area Sa of the processed ALC 2 photographed by the television camera 5 on the side where the means 4 is installed hardly changes. However, when the shape of the processed ALC2 is distorted from the predetermined shape (see FIG. 2), for example, FIG.
Alternatively, as shown in FIGS. 7 and 8, when one end face in the longitudinal direction of the processed ALC panel 2 has a concave shape, a convex shape, or both end surfaces have a convex shape or a concave shape and is distorted,
Area S of the processed ALC2 taken by another TV camera 6
b changes, and the brightness distribution curve h in FIG. 4b changes.

Further, a computer control device 10 is installed outside the two steps A and B, and receives data output from the image processing device 9 through a circuit c. This data is compared and compared with the reference data Ds that has been input to the computer control device 10 in advance, and the computer control device 10 determines whether the difference between the two is greater than or equal to a predetermined value. Then, the conveyor 3 is stopped by feeding back the determination result from the circuit e to the actuator 11 as a determination signal. Conveyor 3
At the time when is stopped, the processed ALC panel on the inspection process B is removed as a defective shape artificially or mechanically from the manufacturing process.

As described above, in this embodiment, the shape distortion of the rectangular processed ALC panel which is intermittently manufactured at a predetermined interval from the processing step A can be detected easily and surely in a non-contact manner. It is possible to operate the two TV cameras by using the image processing apparatus described above, and as a result, it is possible to reduce the facility cost.

The present invention can be carried out by partially modifying the above-described mode within the scope of not ruining the effect of the invention while following the fundamental technical technical idea. For example, ALC
If there is a joint on one end face in the longitudinal direction of the panel and the brightness of that part is warmly input to the image processing device, install a special device to cut the warm brightness to the image processing device. You can Further, as the rectangular object in the present invention, any object whose width or the like needs to be detected in a non-contact state can be used in the manufacturing process and distribution process of any object.

[0018]

As described in detail above, the present invention is excellent in that the shape distortion of a rectangular object can be detected in a non-contact state by relatively inexpensive equipment in the process of intermittently moving the object at a predetermined interval. Exert the effect.

[Brief description of drawings]

FIG. 1 is a process drawing showing an example of the present invention.

FIG. 2 is a top view of a normal rectangular object.

FIG. 3 is a top view of a distorted rectangular object.

4A and 4B are schematic diagrams showing the field of view of a television camera.

4a and 4b are diagrams showing the brightness of an object photographed by a television camera.

5, 6, 7, and 8 are diagrams showing typical examples of shape distortion.

[Explanation of symbols]

 2 Object whose plane is rectangular 2a Longitudinal direction one end face 2b Longitudinal direction other end face 3 Conveyor 5, 6 Television camera 9 Image processing device 10 Computer control device 11 Actuator

Claims (2)

[Claims] 1. An object (2) whose plane has a rectangular shape.
Is moved on the conveyor (3) while regulating the passage position of one end face (2a) in the longitudinal direction thereof, and (b) a television camera above or below both end faces (2a, 2b) in the longitudinal direction, respectively. (5, 6) is installed to intermittently capture a part of the moving object, and (c) the area of the object captured by the television camera is processed by an image processing device (9) and Inputting the output data to the computer control device (10) to make a comparison judgment with reference data input in advance to the computer control device, and (d) the judgment signal output from the computer control device to the actuator of the conveyor ( 11) is fed back, and the shape distortion of an object whose plane consisting of a rectangle is detected. 2. The two television cameras are installed at a predetermined interval in the longitudinal direction of the object.
A method for detecting a shape distortion of an object whose plane is a rectangle.