JP5529630B2 - Spray injection condition monitoring device - Google Patents

Description

  The present invention relates to a spray ejection state monitoring device that monitors the ejection state of a spray that ejects a transparent or white fluid.

  2. Description of the Related Art Conventionally, a material such as paint is sprayed by spraying to coat and protect the surface of the object. Since this coating is intended for decoration and protection of objects, an appropriate amount of fluid must be supplied. However, although the spray ejects fluid from the nozzle, the nozzle is likely to be clogged, and the fluid may not be supplied in an appropriate amount due to clogging of the nozzle.

  Therefore, in order to confirm whether or not an appropriate amount of fluid is supplied, a flow meter is used. The flow meter determines whether or not the amount of fluid flowing through a pipe for supplying the fluid to the spray nozzle is appropriate. However, with a flow meter, it is difficult to detect even if a change occurs in the injection state from the nozzle. Therefore, Patent Document 1 is disclosed as a method for detecting the spray state.

  Patent Document 1 discloses a spray injection state monitoring system for monitoring the spray state of a spray in which fluid is continuously sprayed, and an imaging device that captures the spray state of the spray and illumination that illuminates the spray spray shape from behind Apparatus, shape extraction means for extracting a spray injection shape by performing image processing on image data captured by the imaging device, and determination means for determining whether or not the injection state is normal based on the extracted spray injection shape A spray injection state monitoring system is disclosed.

  However, in Patent Document 1, since the illumination device illuminates the spray ejection shape from behind, if the fluid is a transparent color or white system, it is difficult to distinguish the ejected fluid from the illumination part, and the shape is extracted. I can't. In Patent Document 1, shape extraction is performed by filter processing. The filter processing is a positive coefficient for pixels closer to the ejection destination than the target pixel, and is closer to the spray nozzle than the target pixel. This is done by a determinant that gives a negative coefficient to the pixel on the side and 0 to the pixel of interest, and distinguishes between the pixels in the spray area and the pixels outside the spray area, Since extraction is performed, if the fluid is a transparent color or white, it is difficult to distinguish the ejected fluid from the illumination portion, and the shape cannot be extracted.

JP 2006-266718 A

  The present invention provides a spray injection state monitoring device that can accurately determine the quality of the spray state of spraying a transparent or white fluid.

The present invention provides a spray injection state monitoring device that monitors the spray state of a spray that sprays a transparent or white fluid, and includes an imaging unit that captures the spray state, and a spray state of the spray. A background plate that becomes a background when photographing, an illuminating unit that illuminates the fluid ejected from the spray, and an image processing unit that performs image processing on image data photographed by the photographing unit. The background plate is black and is provided so as to face the photographing unit with the spray interposed therebetween. The illuminating unit illuminates the fluid ejected from the spray, but is arranged so as not to illuminate a portion of the background plate to be photographed. The image processing unit binarizes a region within a predetermined distance and range from the tip of the spray nozzle in the image data photographed by the photographing unit, and divides it into a fluid object and a background, and obtains the obtained data It is determined whether or not the spray state is normal by comparing previously registered data and / or calculating the area of the fluid in the data classified into the fluid and the background. Note that the white system is a color including light colors such as light yellow and light blue similar to white and white. The black type is a color including dark colors such as dark red and dark blue similar to black and black.
The spray is mobile, and may include a detector that activates the photographing unit when the spray moves to a predetermined position.
Further, the image processing unit is set so that the binarized area is within the spread of the fluid when normally sprayed from the spray nozzle, or the binarized area The spread of the fluid is set smaller than the spread of the fluid when normally sprayed from the spray nozzle, or the spread of the binarized area is normally sprayed from the spray nozzle It is preferable to set so as to coincide with the spread of the fluid in the case.

  ADVANTAGE OF THE INVENTION According to this invention, the spray injection state monitoring apparatus which can determine correctly the quality of the spray state of the spray which injects a transparent color or white type | system | group fluid substance can be provided.

FIG. 1 is a schematic view showing an outline of an embodiment of a spray injection state monitoring apparatus according to the present invention. FIG. 2 is a diagram showing a range for image processing. FIG. 3 is a diagram illustrating an example of a normal image data pattern. FIG. 4 is a diagram illustrating an example of an abnormal image data pattern. FIG. 5 is a diagram illustrating another example of an abnormal image data pattern. FIG. 6 is a diagram showing still another example of an abnormal image data pattern. FIG. 7 is a diagram showing still another example of an abnormal image data pattern. FIG. 8 is a diagram showing still another example of an abnormal image data pattern.

  An embodiment of a spray injection state monitoring apparatus according to the present invention will be described with reference to the drawings.

FIG. 1 is a schematic view showing an outline of an embodiment of a spray injection state monitoring apparatus according to the present invention.
In FIG. 1, a transparent or white paint A that is a fluid is sprayed downward from a spray nozzle 1 to coat an article that passes below. A camera 2 that is a photographing unit is provided on the side of the spray nozzle 1, and the spray nozzle 1 and the sprayed paint are photographed by the camera 2. In addition, a plate 3 is arranged as a background plate so as to face the camera 2 with the spray nozzle 1 in between. The surface of the plate 3 facing the camera is painted black. And the light 4 which is an illumination part is arrange | positioned so that the spray nozzle 1 and the sprayed coating material which are image | photographed with the camera 2 may be illuminated. The light 4 is arranged so as not to illuminate the plate 3.

  When the paint is sprayed downward from the spray nozzle 1, the spray nozzle 1 and the sprayed paint are illuminated by the light 4. And the camera 2 images the spray nozzle 1 illuminated by the light 4 and the sprayed paint. In addition, the board 3 is image | photographed in the background.

The captured image data is processed by the image processing unit 5. The image processing unit 5 includes an image processing unit 6, a determination unit 7, and an abnormal signal output unit 8.
The image processing means 6 detects the position of the spray nozzle in the image data. Since the spray nozzle has a predetermined shape and is photographed in white by being illuminated by the light 4, it is easy to extract the shape. Therefore, if shape information that is a determination condition of the spray nozzle is registered in the image processing means 6, the image processing means 6 can detect the spray nozzle. In the fixed spray, the position of the spray nozzle is determined, and the position may be registered in the image processing means 6. Then, the image data in a predetermined range from the tip of the spray nozzle is binarized and divided into a fluid object and a background. FIG. 2 is a diagram showing a range for image processing, and image processing is performed on a region B surrounded by a dotted line below the tip of the spray nozzle 1. In addition, although it is preferable to provide the area B slightly smaller than the area of the fluid normally ejected from the spray nozzle 1, it may be matched with the area. The binarization processing is to obtain brightness for each pixel of the image data, and to process white if the brightness is larger than a certain value, and to process black if the brightness is smaller, and the paint is brightly illuminated by the light 4. It becomes white, and the background is black because it is not illuminated by the light 4, so it can be divided into fluid and background.
Image data is registered in the determination unit 7 in advance, and the image data obtained in the image processing unit 6 is compared with the image data registered in advance to determine whether the spraying state is normal. Specifically, an image pattern in a normal state as shown in FIG. 3 is registered, and if it matches, it is determined that it is normal, and if it does not match, it is determined that the spraying state is abnormal. To do. Alternatively, if the image data patterns in the abnormal state as shown in FIGS. 4 to 8 are registered and match or similar to these image data patterns, it is determined that the spraying state is abnormal, In other cases, it can be determined that the state is normal. The image processing unit 5 is connected to a monitor 9 serving as a display unit, so that image data subjected to image processing can be displayed and an abnormal image can be confirmed.
The abnormality signal output unit 8 outputs an abnormality signal when the determination unit 7 determines that an abnormality has occurred. When an abnormal signal is output, the line can be stopped, an alarm can be sounded, or the monitor 9 can display an abnormal state.

  As another form, the binarization processing range by the image processing means 6 may be an area below the spray nozzle and away from the spray nozzle. In this case, the area is set so as to be within the spread of the fluid normally ejected from the spray nozzle.

  Moreover, as another form, the determination method of the determination means 7 can also be changed. Specifically, the determination unit 7 calculates the area of the fluid in the image data obtained by the image processing unit 6, and determines whether or not the spray state is normal from the calculated area. In this case, the lower limit area of the fluid is registered in advance, and when the calculated area falls below the lower limit value, it is determined that the state is abnormal. The lower limit value can be changed.

  Furthermore, as another mode, as a determination method of the determination unit 7, the image data obtained by the image processing unit 6 is compared with image data registered in advance to determine whether or not the spraying state of the spray is normal. It is also possible to calculate the area of the fluid in the image data obtained by the image processing means 6 and determine whether or not the spray state is normal from the calculated area. That is, whether or not the spray state is normal is determined by two methods. In this case, if both results are normal, it is determined to be normal, and otherwise, it is finally determined to be abnormal.

  Furthermore, as another form, it can also be applied to a mobile spray. Specifically, the photographing unit, the background plate, and the illumination unit are fixed, and the spray state of the spray is photographed when the movable spray nozzle enters the photographing range of the photographing unit. For this reason, in this case, a detector for detecting the position of the spray nozzle is installed, and when the nozzle of the mobile sprayer comes into a position within the photographing range of the photographing section, the photographing section is set to perform photographing. Yes.

  Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made within the scope of the invention described in the claims.

  As described above, according to the present invention, it is possible to provide a spray injection state monitoring device that can accurately determine the quality of the spray state of spraying a transparent or white fluid.

DESCRIPTION OF SYMBOLS 1 Spray nozzle 2 Camera 3 Board 4 Light 5 Image processing part 6 Image processing means 7 Judgment means 8 Abnormal signal output means 9 Monitor

Claims (6)

A spray spray state monitoring device for monitoring a spray state of a spray that sprays a transparent or white fluid,
A shooting unit for shooting the spray state;
A background plate as a background when shooting the spray state,
An illumination unit for illuminating a spray nozzle and fluid ejected from the spray;
In the image data photographed by the photographing unit, the data within a predetermined distance and range from the tip of the spray nozzle is binarized to classify it into a fluid object and a background, and data registered in advance in the obtained data And an image processing unit that determines whether or not the spray state is normal,
The background plate is black and is provided so as to face the imaging unit with a spray interposed therebetween,
The illumination unit is disposed so as to illuminate the sprayed nozzle and the fluid ejected from the spray, but does not illuminate a portion to be photographed of the background plate ,
The image processing unit includes an image processing unit and a determination unit,
The image processing means detects the position of the spray nozzle from the image data photographed by the photographing unit and the shape information of the spray nozzle registered in advance, and brightens an area within a predetermined distance and range from the tip of the spray nozzle. By binarization processing, it is divided into fluid and background,
The determination unit compares the image data obtained by the image processing unit with a pre-registered normal state image data pattern or an abnormal state image data pattern, and determines whether or not the spray is in agreement or similar. It is determined whether or not the spray is normal . A spray spray state monitoring device for monitoring a spray state of a spray that sprays a transparent or white fluid,
A shooting unit for shooting the spray state;
A background plate as a background when shooting the spray state,
An illumination unit for illuminating a spray nozzle and fluid ejected from the spray;
In the image data photographed by the photographing unit, binarization processing is performed on a region within a predetermined distance and range from the tip of the spray nozzle, the fluid is separated from the background, and the obtained data is registered in advance. with collated data, we calculate the area of the fluid product in said data, the results and the calculated area of against, and a determining image processing unit injection state is normal or not of a spray,
The background plate is black and is provided so as to face the imaging unit with a spray interposed therebetween,
The illumination unit is disposed so as to illuminate the sprayed nozzle and the fluid ejected from the spray, but does not illuminate a portion to be photographed of the background plate ,
The image processing unit includes an image processing unit and a determination unit,
The image processing means detects the position of the spray nozzle from the image data photographed by the photographing unit and the shape information of the spray nozzle registered in advance, and brightens an area within a predetermined distance and range from the tip of the spray nozzle. By binarization processing, it is divided into fluid and background,
The determination unit compares the image data obtained by the image processing unit with a pre-registered normal state image data pattern or an abnormal state image data pattern, and determines whether or not they match or are similar. Whether the spray state is normal by calculating the area of the fluid in the image data obtained by the image processing means and determining whether the area is less than the lower limit area of the fluid registered in advance spraying condition monitoring apparatus according to claim <br/> that determines. The spray is mobile,
The spray injection state monitoring apparatus according to claim 1 or 2, further comprising a detector that activates the photographing unit when the spray moves to a predetermined position . The image processing unit is set so that a binarized region is within a spread of a fluid object when normally sprayed from the spray nozzle. Item 4. The spray injection state monitoring device according to any one of Items 1 to 3 . The image processing unit spreads the area to be binarized is, according to claim 1 to 3, characterized in that is smaller than the spread of the fluid product when it is normally ejected from the nozzle of the spray The spray injection state monitoring apparatus in any one. The image processing unit is set so that a spread of an area to be binarized matches a spread of a fluid when normally sprayed from the nozzle of the spray. 4. The spray injection state monitoring device according to any one of 3 .

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