JP2004249388A - System and device for preventing screw from left untightened - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for preventing a screw from left untightened preventing screws such as a plurality of bolts fastened by a torque wrench with a marker from being left untightened. <P>SOLUTION: This device has a camera for photographing a plurality of screw members tightened by the torque wrench with the marker, and a determining means for determining whether or not the whole screw members are tightened on the basis of a mark attached to a head part of the screw members photographed by the camera. The determining means performs binarization processing on an image photographed by the camera; determines the total area of the mark obtained by performing the binarization processing; arithmetically operates a gravity center position of the binarization processing-applied mark from the total area; and determines whether or not the whole screw members are tightened by comparing the center of gravity of the whole screw members in a preregistered photographing range. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a screw tightening forgetting prevention system and a locking device capable of preventing screw tightening such as screws and bolts.
[0002]
[Prior art]
Human error is the most troublesome of the reliability of screw tightening work. Essentially, humans must make mistakes. It is said that the most common human error is forgetting to tighten the screw. In this situation, the screw is usually temporarily tightened and then fully tightened in order to normally and efficiently tighten the screw.
[0003]
However, the temporarily tightened screw cannot be distinguished from the finally tightened screw at first sight, and thus may not be fully tightened.
[0004]
Therefore, as one method of confirming the final tightening, in a torque wrench used for tightening screws such as bolts, when the tightening torque reaches a predetermined value, the attached marker operates and stamps on the bolt or around it. Has been proposed.
[0005]
As a torque wrench with a marker, for example, a torque wrench described in JP-A-6-297352 is known. This torque wrench with a marker has a wrench main body having a head and a handle, a ratchet cylinder that ratchet-engages the head of the wrench main body, and engages with a tightened bolt or nut fixed to the tip of the ratchet cylinder. It has a possible socket and a marker rod which is slidably inserted in the ratchet cylinder in the axial direction and has a marker at the tip. When the predetermined tightening torque is reached, the marker rod is slid in the axial direction toward the distal end by the operation of the toggle link provided in the handle of the wrench main body, and the marker is moved in the socket to thereby end the bolt. The seal is to be made.
[0006]
[Problems to be solved by the invention]
However, even if such a torque wrench with marker can be used to distinguish between final tightening and temporary tightening with paint on the head of the bolt, the mark is checked visually by the operator, and therefore human Errors can occur.
[0007]
Therefore, an object of the invention according to the present application is to solve such a conventional problem and to provide a system and an apparatus for preventing forgetting to tighten a screw, which can completely prevent forgetting to tighten.
[0008]
[Means for Solving the Problems]
A first configuration of a screw tightening forgetting prevention system according to the present invention is characterized in that a plurality of screw members tightened by a first marker-equipped tightening tool are photographed by photographing means, and based on a mark provided on a head of the screw member. A forgetting screw fastening system that determines whether or not all the screw members are tightened, wherein the image captured by the image capturing unit is binarized, and a mark obtained by the binarizing process is processed. It is characterized in that it is determined whether or not all the screw members are tightened by comparing the counted number with the number of screw members in the imaging range registered in advance.
[0009]
The second configuration of the screw tightening forgetting prevention system according to the present invention is such that a plurality of screw members tightened by a marker-equipped tightening tool are photographed by photographing means, and all of the screw members are marked based on the marks attached to the heads of the screw members. A screw tightening forgetting prevention system that determines whether or not a screw member is tightened, wherein the image photographed by the photographing means is binarized, and the total area of the mark obtained by the binarization processing is calculated. Then, the center of gravity of the binarized mark is calculated from the total area, and is compared with the center of gravity of all the screw members in the imaging range registered in advance to determine whether all the screw members are tightened. It is characterized in that it is determined whether or not it is.
[0010]
A third configuration of the system for preventing forgetting to tighten a screw according to the present invention is that a plurality of screw members tightened with a tightening tool with a marker are photographed by photographing means, and all of the screw members are photographed on the basis of marks attached to the heads of the screw members. A screw tightening forgetting prevention system that determines whether a screw member has been tightened, wherein the image photographed by the photographing means is binarized, and the number of marks obtained by the binarization processing is counted. A first determination process for determining whether all the screw members are tightened by comparing the number of screw members in the imaging range registered in advance, and a mark obtained by the binarization process; Is calculated, the position of the center of gravity of the binarized mark is calculated from the total area, and the center of gravity of all the screw members in the imaging range registered in advance is compared. Determine whether or not it is tightened And having a second determination process that.
[0011]
A first configuration of the screw tightening forgetting prevention device of the present invention is provided with a photographing means for photographing a plurality of screw members tightened by a marker-equipped tightening tool, and a head attached to the screw member photographed by the photographing means. And a determination unit for determining whether all the screw members are tightened based on the mark that has been tightened, wherein the determination unit performs a binarization process on the image captured by the imaging unit. Then, comparing the count number of the mark obtained by the binarization processing with the number of screw members in the pre-registered photographing range to determine whether all the screw members are tightened. It is characterized by.
[0012]
A second configuration of the screw tightening forgetting prevention device according to the present invention is provided with a photographing means for photographing a plurality of screw members tightened by a marker-equipped tightening tool, and a head attached to the screw member photographed by the photographing means. And a determination unit for determining whether all the screw members are tightened based on the mark that has been tightened, wherein the determination unit performs a binarization process on the image captured by the imaging unit. Then, the total area of the mark obtained by the binarization processing is obtained, the center of gravity of the binarized mark is calculated from the total area, and all the screws in the photographing range registered in advance are calculated. It is characterized in that it is determined whether all the screw members are tightened by comparing the center of gravity of the members.
[0013]
A third configuration of the screw tightening forgetting prevention device according to the present invention is provided with a photographing means for photographing a plurality of screw members tightened with a marker-equipped tightening tool, and a head attached to the screw member photographed by the photographing means. And a determining unit for determining whether all the screw members are tightened based on the mark. The device for preventing forgetting to tighten a screw, the determining device performs a binarization process on an image captured by the capturing unit. Then, by comparing the count number of the mark obtained by the binarization processing with the number of screw members in the previously registered photographing range, it is determined whether or not all the screw members are tightened. (1) calculating the total area of the mark obtained by the binarization processing, calculating the position of the center of gravity of the binarized mark from the total area, And the center of gravity of all screw members in And having a first determines whether all of the screw member is tightened to compare second determination processing unit.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
1 to 4 show an embodiment of the present invention.
[0015]
FIG. 1 is a schematic block diagram showing an embodiment of the present invention.
[0016]
In FIG. 1, reference numeral 1 denotes a computer as a terminal device, 2 denotes a small CCD camera as a measuring instrument, and the camera 2 and the computer 1 are connected by a coaxial cable. The heads of the tightened screws are photographed at a time, and the photographed image data is subjected to image processing and the like by the computer 1.
[0017]
The computer 1 is configured as shown in FIG. In FIG. 2, reference numeral 3 denotes a CPU and the like, which controls each unit, performs various calculations, temporarily stores data, and the like.
[0018]
The input control means 4 controls image data input from the camera 2 connected via a coaxial cable.
[0019]
Reference numerals 5 and 6 denote storage means, respectively, which store and store files as follows.
[0020]
In the storage means 5, a main program for performing image processing, master registration, and environment setting is written, and image processing data is stored. The main program is used in the control means 3 and includes, for example, a program for displaying details of image processing on a display unit of a computer, and a program for performing image processing and setting data within an allowable range.
[0021]
The storage means 6 stores a master file. This master file is created when setting or changing the environment, and is composed of information necessary for image processing and discrimination such as the number of tightening pieces, threshold value, area, center of gravity, and photographing range of the camera.
[0022]
In the present embodiment, when determining whether screw tightening has been forgotten by image processing, the number of screws to be tightened is known in advance (pre-registered), so the number of marks is counted by image processing and registered. By comparing with the number of fastenings, it can be determined whether or not the fastening has been forgotten.
[0023]
For this reason, in the present embodiment, as shown in FIG. 4, a binarization process is performed in which the mark position of a captured image is whitened, and the number of white portions is counted.
[0024]
On the other hand, in the case of shooting with the camera 2, the mark portion may not clearly appear in the shot image depending on the state of external light, the brightness of the room, and the like.
[0025]
Therefore, in the present embodiment, the total area of the binarized mark is obtained, and thereby the center of gravity of the mark position is obtained.
[0026]
That is, the fastening positions of the predetermined number of bolts are determined in advance, and the center of gravity of each bolt is automatically determined. At this time, even if the image of the mark is clearly or thinly displayed, if the mark is attached to the head of all bolts, the position of the center of gravity obtained from the total area is the same position . Therefore, in the present embodiment, the total area of the mark is obtained. At this time, since the position of the object to be tightened is not always at a fixed position, the position of the center of gravity is determined by obtaining the X and Y coordinates on a two-dimensional plane.
[0027]
Therefore, the reliability is higher than the determination based on the number check of the marks, and if this center-of-gravity determination method and the above-described number determination method are used in combination, it is possible to reliably perform the forgotten fastening determination.
[0028]
This determination process is shown in FIG.
[0029]
In FIG. 3, when the measurement on the main screen is selected on the display screen of the computer 1, the process proceeds to the processing routine of (1), and if image processing data is registered, preparation for image capture is performed.
[0030]
When the tightening of the screws is completed, the images of the heads of the plurality of screws in the predetermined range are captured, the number determination process is performed by the above-described binarization process, and the above-described center-of-gravity position determination process is performed.
[0031]
The result of these determinations is displayed on the display screen, and when the next operation is to be performed, the preparation for capturing the image is performed again, and the same forgotten screw tightening determination as described above is performed. When the end is selected on the display screen displaying the determination result, the display returns to the main screen. When no data is registered, the display returns to the main screen.
[0032]
Next, when an environment setting is selected on the main screen, the process proceeds to an environment setting processing routine of (2), and an image is captured.
[0033]
This environment setting routine sets the number of tightening pieces, determines a threshold value for mark determination in a read image for binarization, and determines an allowable range of the center of gravity.
[0034]
When the photographing range of the camera is changed, the process jumps to the process (3) to determine the photographing range of the X axis and the Y axis.
[0035]
When the processing of the above (3) is completed, or when the photographing range of the camera is not changed, the changed data is updated at the time of shifting to the main screen or the measurement screen.
[0036]
【The invention's effect】
As described above, according to the present invention, with respect to a plurality of marks attached to the head of a screw such as a bolt for which the screw tightening operation has been completed, all the screws such as a plurality of bolts that can be confirmed in one shot are marked. , That is, whether or not all the screws are securely tightened.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of the present invention. FIG. 2 is a block diagram showing a configuration of a computer in FIG. 1. FIG. 3 is a flowchart showing an operation of the embodiment of the present invention. Diagram showing processed image [Explanation of reference numerals]
DESCRIPTION OF SYMBOLS 1 Computer 2 CCD camera 3 Control means 4 Input control means 5 and 6 Storage means

Claims (6)

A plurality of screw members tightened by the marker-equipped tightening tool are photographed by photographing means, and it is forgotten to determine whether all the screw members are tightened based on a mark attached to the head of the screw member. Prevention system, which binarizes an image photographed by the photographing means, and counts the number of marks obtained by the binarization processing and the number of screw members in a previously registered photographing range. A system for preventing forgetting to tighten a screw, comprising determining whether or not all screw members are tightened. A plurality of screw members tightened by the marker-equipped tightening tool are photographed by photographing means, and it is forgotten to determine whether all the screw members are tightened based on a mark attached to the head of the screw member. A prevention system, which binarizes the image photographed by the photographing means, obtains the total area of the mark obtained by the binarization processing, and calculates the total area of the mark obtained by the binarization processing from the total area. A system for calculating the position of the center of gravity, comparing the center of gravity of all the screw members within the previously registered photographing range with the center of gravity of the screw member to determine whether or not all the screw members are tightened. . A plurality of screw members tightened by the marker-equipped tightening tool are photographed by photographing means, and it is forgotten to determine whether all the screw members are tightened based on a mark attached to the head of the screw member. Prevention system, which binarizes an image photographed by the photographing means, and counts the number of marks obtained by the binarization processing and the number of screw members in a previously registered photographing range. A first determination process for determining whether all the screw members are tightened by comparison, and obtaining a total area of the mark obtained by the binarization process, and performing the binarization process from the total area. A second determination process of calculating the center of gravity of the set mark, comparing the center of gravity of all the screw members in the imaging range registered in advance, and determining whether or not all the screw members are tightened. Screw having Because forget prevention system. A photographing means for photographing a plurality of screw members tightened by a marker-equipped tightening tool, and whether or not all the screw members are tightened based on a mark attached to the head of the screw member photographed by the photographing means A device for preventing forgetting to tighten a screw, comprising: a binarizing process for an image photographed by the photographing unit; and a count of a mark obtained by the binarizing process. A device for preventing forgetting to tighten a screw, wherein the number is compared with a previously registered number of screw members in an imaging range to determine whether all the screw members are tightened. A photographing means for photographing a plurality of screw members tightened by the marker-equipped tightening tool, and whether or not all the screw members are tightened based on a mark attached to the head of the screw member photographed by the photographing means And a determination unit for determining whether or not the screw tightening has been forgotten. The determination unit performs a binarization process on an image captured by the imaging unit, and calculates a total of marks obtained by the binarization process. The area is obtained, the position of the center of gravity of the binarized mark is calculated from the total area, and the center of gravity of all the screw members within the previously registered photographing range is compared with each other, so that all the screw members are tightened. A device for preventing forgetting to tighten a screw, characterized in that it is determined whether or not the screw is tightened. A photographing means for photographing a plurality of screw members tightened by a marker-equipped tightening tool, and whether or not all the screw members are tightened based on a mark attached to the head of the screw member photographed by the photographing means A forgetting device for preventing screw tightening, wherein the determining device binarizes an image photographed by the photographing device, and counts marks obtained by the binarizing process. A first determination processing unit that compares the number with the number of screw members in a pre-registered photographing range to determine whether or not all the screw members are tightened; The total area of the obtained marks is obtained, the position of the center of gravity of the binarized mark is calculated from the total area, and the center of gravity of all the screw members within the photographing range registered in advance is compared to obtain the total area. Are the screw members tightened? Screwing forgetting prevention device and having a second determination processing unit determines.

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