CN111610190B - Appearance inspection device for household appliances - Google Patents
Appearance inspection device for household appliances Download PDFInfo
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- CN111610190B CN111610190B CN201910878711.1A CN201910878711A CN111610190B CN 111610190 B CN111610190 B CN 111610190B CN 201910878711 A CN201910878711 A CN 201910878711A CN 111610190 B CN111610190 B CN 111610190B
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8806—Specially adapted optical and illumination features
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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Abstract
The present invention provides a household appliance appearance inspection device, comprising: a visual inspection unit for capturing an appearance of an inspection object; a support frame for supporting the visual inspection unit so that the visual inspection unit can move in a vertical direction; and a control unit for moving the visual inspection unit in a vertical direction along the support frame to capture the appearance of the inspection object, and determining whether the inspection object is defective based on the image obtained by the visual inspection unit.
Description
Technical Field
The present invention relates to an appearance inspection device for home appliances, and more particularly, to a device for detecting an appearance defect of a home appliance such as a refrigerator, a washing machine, an air conditioner, etc., using a visual inspection algorithm.
Background
In general, household appliances such as refrigerators, washing machines, air conditioners may have defects including cracks or scratches during a process or handling, which may reduce consumer confidence in products. Therefore, an appearance inspection process of inspecting surface defects of the home appliances is required, and generally, the appearance inspection is performed by naked eyes. However, the workability of visual inspection by the naked eye is lowered, and there is a possibility that defects cannot be inspected due to errors of inspectors, so that the degree of trust is not high.
Disclosure of Invention
The invention provides a visual inspection device for detecting bad appearance by inspecting the appearance of household appliances. The quality of the product can be improved and an effective inspection system established by performing a final inspection of the product produced using the appearance inspection device for home appliances proposed in the present invention.
The appearance defect of the home appliance is automatically detected in the product production line, thereby minimizing the inspection time and more accurately performing the inspection of various items.
The present invention also provides an appearance inspection device for a household appliance, which can realize additional management of product production and product history by using a database for providing management, counting inspection quantity, bad quantity records and the like.
The present invention provides a household appliance appearance inspection device, comprising: a visual inspection unit for capturing an appearance of an inspection object; a support frame for supporting the visual inspection unit so that the visual inspection unit can move in a vertical direction; and a control unit configured to move the visual inspection unit in a vertical direction along the support frame and capture an appearance of the inspection object, wherein the control unit determines whether the inspection object is defective based on the image acquired by the visual inspection unit.
The present invention provides a household appliance appearance inspection device, which further comprises: a conveying unit configured to convey the inspection object; and an identification code reader for scanning an identification code attached to the inspection object to identify the inspection object when the inspection object moves on the conveying part, wherein the control part loads product information related to the identified inspection object and changes the shooting setting of the visual inspection part based on the product information.
The present invention provides a household appliance appearance inspection device, wherein the control part judges the surface metal pattern direction of the inspection object based on the product information, and based on the judged surface metal pattern direction, the visual inspection part operates in a transverse scanning mode or a longitudinal scanning mode.
The present invention provides a household appliance appearance inspection device, the household appliance appearance inspection device further comprises a joint part rotating the visual inspection part by 90 degrees according to a transverse scanning mode and a longitudinal scanning mode, the visual inspection part comprises: an image acquisition device for acquiring an image of the inspection object; an illumination unit configured to irradiate light to the inspection object; a distance measuring unit configured to measure a distance between the inspection object and the visual inspection unit; and a distance adjusting unit configured to adjust a distance between the inspection object and the visual inspection unit, wherein the control unit moves the visual inspection unit in a vertical direction along the support frame in a vertical scanning mode to capture an appearance of the inspection object when the surface metal of the inspection object has a vertical pattern, and wherein the control unit rotates the joint unit by 90 degrees to move the visual inspection unit in a horizontal direction to capture an appearance of the inspection object when the surface metal of the inspection object has a horizontal pattern.
The present invention provides a household appliance appearance inspection device, wherein the conveying part comprises: a stopper unit for stopping the inspection object so that the inspection object is positioned at an inspection position; and an alignment part for fixing and aligning the inspection objects stopped by the stopper part, wherein the alignment part applies pressure to the inspection objects stopped by the stopper part at both sides to perform alignment.
The present invention provides a household appliance appearance inspection device, wherein the visual inspection part comprises: a first vision unit located on the front surface of the inspection object; a second vision unit located on the left side of the inspection object; a third vision unit located on the right side of the inspection object; a fourth visual portion located between the first visual portion and the second visual portion; and a fifth visual portion located between the first visual portion and the third visual portion, wherein the first visual portion, the second visual portion, and the third visual portion are horizontally movable left and right, and the fourth visual portion and the fifth visual portion are rotatably movable at fixed positions.
The present invention provides a household appliance appearance inspection device, wherein the first to fifth visual parts comprise: an image acquisition device for acquiring an image of the inspection object; an illumination unit configured to irradiate light to the inspection object; a distance measuring unit for measuring a distance between the inspection object and the vision unit; and a distance adjusting unit configured to adjust a distance between the inspection object and the vision unit, the distance adjusting unit being configured to control the distance adjusting unit based on the distance measured by the distance measuring unit as the vision inspection unit moves in a vertical direction.
The present invention provides a household appliance appearance inspection device, wherein the household appliance appearance inspection device further comprises an inspection result output part for displaying an appearance inspection result related to the inspection object, and the control part outputs to the inspection result output part at a defective display position of the image shot by the visual inspection part.
According to the present invention, a one-stop quality inspection system is introduced from the product manufacturing step to the finishing step to solve the problem of degradation of inspection quality of a target product, and a more effective inspection support system can be established.
According to the present invention, in the process of performing the final inspection of the product produced by the manufacturing and production processes using the household electrical appliance appearance inspection device, the inspection time and cost can be greatly reduced, and thus the improvement of productivity and management convenience of the process line can be contributed.
According to the present invention, the appearance inspection device for household appliances uses the conventional camera inspection device, so that inspection cost can be reduced, and defects of a plurality of individual products can be easily detected in a short time. The intelligent factory can be realized by high speed and stability of inspection and large datamation of production and manufacturing procedures accumulated by inspection results.
Drawings
Embodiments of the present invention will be described with reference to the drawings described below, wherein like reference numerals denote like structural elements, but the present invention is not limited thereto.
Fig. 1 is a perspective view schematically showing an appearance inspection device for a household appliance.
Fig. 2 is a perspective view schematically showing an appearance inspection device for a household appliance.
Fig. 3 is a diagram showing a state in which an inspection object is fixed at an inspection position.
Fig. 4 is a view showing a support frame supporting the visual inspection portion.
Fig. 5 is a diagram showing a detailed structure of the visual inspection section.
Fig. 6 is a view of the scanning direction of the visual inspection unit according to an embodiment of the present invention.
Fig. 7 is a diagram showing an appearance inspection result screen according to an embodiment of the present invention.
Fig. 8 is a flow chart of an appearance inspection of a home appliance according to an embodiment of the present invention.
Fig. 9 is a diagram showing a microscopic crack detection step in a photographed image.
Fig. 10 is a diagram showing a foreign matter inspection step in a photographed image.
Fig. 11 is a view showing an image of a front face of a home appliance determined to be a good.
Fig. 12 is a view showing a part of an image of the front face of the home appliance determined to be defective.
Fig. 13 is a diagram showing a visual portion of the left or right side of the subject to be inspected.
Fig. 14 is a diagram showing a visual portion for photographing a left or right corner of an inspection object.
Fig. 15 is a flow chart of an appearance inspection of a home appliance having a metal surface according to an embodiment of the present invention.
Description of the reference numerals
110: the visual inspection unit 120: inspection result output unit
210: the conveying section 220: inspection object loading unit
230: inspection object 240: identification code reader
330: stop 340: alignment part
420: support frames 510, 520, 530, 540, 550: visual part
552: image acquisition device 554: lighting part
556: distance measuring unit
Detailed Description
Hereinafter, specific matters for carrying out the present invention will be described in detail with reference to the accompanying drawings. However, in the following description, if it is determined that the gist of the present invention is not clear, a specific description about well-known functions or configurations will be omitted.
In the drawings, the same or corresponding constituent elements may be given the same reference numerals. In the following description of the embodiments, the same or corresponding components may be omitted from repeated descriptions. However, even if the technology concerning the structural elements is omitted, such structural elements are not included in other embodiments. Terms of relative position may be used to describe relationships between structures in the drawings, and the invention is not limited to such terms.
Fig. 1 is a perspective view schematically showing an appearance inspection device 100 for a household electrical appliance. The home appliance appearance inspection device 100 may include: a visual inspection part 110 for photographing an appearance of the home appliance as an inspection object; and an inspection result output section 120 for confirming the appearance inspection result. When the inspection object reaches the inspection position, the visual inspection unit 110 moves in the vertical direction and can take an image of the entire appearance of the inspection object.
The home appliance appearance inspection apparatus 100 is an apparatus for inspecting the overall appearance of a home appliance, and obtains an image captured by a high-resolution camera at a specific position on a production line, and can determine the quality or defective state of an inspection object by detecting the defective appearance of the product. In an embodiment, the home appliance appearance inspection device 100 inspects the appearance of home appliances of a refrigerator, a washing machine, an air conditioner, etc., and may provide an inspection result. For example, defective items such as cracks, scratches, collapse, foreign matter, stains, paint peeling, play, and the like in the appearance of the home appliance can be detected.
When the inspection object moving along the product process line is stopped at the inspection position, the visual inspection unit 110 captures an image of the appearance of the inspection object, and can determine the quality and defective state of the inspection object by a visual inspection algorithm. In one embodiment, the control unit (not shown) may move the visual inspection unit 110 in a vertical direction along the appearance of the inspection object and capture an image. The visual inspection unit 110 can move in the horizontal direction and acquire an image, as necessary.
After preprocessing the image of the inspection object captured by the visual inspection unit 110, a control unit (not shown) compares the image with a standard image stored in advance to determine the quality or defective state of the inspection object. The quality or defective state of the inspection object is output to the inspection result output unit 120 and checked by the user. As shown, the inspection result output 120 may include at least one display.
In an embodiment, the inspection result output part 120 may display the result of the appearance of the inspection object photographed in different directions. For example, the visual inspection unit 110 may capture the inspection object in five directions, i.e., the front, left, right, left and right corners, and the control unit (not shown) may output the captured 5 images to the inspection result output unit 120. The control unit (not shown) compares the inspection target with the standard image, outputs the count value of the defective number, the quality product, and the defective product to the inspection result output unit 120, and can display the defective position on the captured image. Therefore, the user can easily and quickly grasp the defective position in the actual product by checking the defective position displayed in the inspection result output unit 120.
In one embodiment, the home appliance appearance inspection device 100 may include 1 master-pc (master-pc) and 3 slave computers (slave-pc). The host computer stores various information including standard images of respective products, and the 3 slave computers can store image data of the front, left, right, left, and right corners of the inspection object photographed by the visual inspection unit 110, respectively.
Fig. 2 is a perspective view schematically showing the electrical appliance appearance inspection apparatus 200. The home appliance appearance inspection device 200 may include: a conveyor belt portion 210; an inspection object loading unit 220 for loading and transferring an inspection object 230 on the conveyor unit; an identification code reader 240 for identifying an identification code of the inspection object 230; a setting section 250 for changing the inspection setting; a process display unit 260 for displaying the current process state; emergency stop button 270 and visual inspection unit 280. In an embodiment, the inspection object 230 may be a floor air conditioner.
The conveyor belt portion 210 may sequentially transfer the inspection objects 230 to the inspection position of the home appliance appearance inspection device 200. The home appliance appearance inspection device 200 may scan the identification code attached to the inspection object 230 using the identification code reader 240 to identify the inspection object before transferring the inspection object 230 to the inspection position. Specifically, the home appliance appearance inspection device 200 may identify why the inspection object is using the identification code reader 240, and may load product information about the corresponding product.
In one embodiment, the home appliance appearance inspection apparatus 200 automatically sets the photographing setting of the visual inspection part 280 to be suitable for the inspection object 230 based on the loaded product information. For example, the home appliance appearance inspection device 200 changes inspection set values of an illumination value, a camera position, a focus, a scanning mode (a lateral scanning mode, a longitudinal scanning mode), and the like of the visual inspection portion 280 based on product information. The home appliance appearance inspection device 200 compares the image of the home appliance appearance inspection device 200 captured by the visual inspection unit 280 with a standard image included in the loaded product information to determine whether or not the inspection object 230 is a defective product. With the structure as described above, the home appliance appearance inspection device 200 can perform custom-made type inspection for various products. Moreover, the inspection records can be stored by product and the intelligent factory can be realized by big data.
If the product information of the inspection object 230 is recognized by the identification code reader 240, the setting unit 250 may output the inspection setting of the visual inspection unit 280 set so as to match the inspection object 230. The user can manually change the inspection set value automatically set by the setting part 250 as needed. For example, the user can change the inspection set values of the illumination value, the camera position, the focus, the scanning mode (lateral scanning mode, longitudinal scanning mode), and the like as needed. In one embodiment, the setting portion 250 may include a touch screen.
The process display unit 260 displays the operation state of the household appliance appearance inspection device 200, and can display the operation state, failure, and the like of the household appliance appearance inspection device 200. For example, when the inspection object 230 is mounted on the conveyor portion 210 and transferred, the inspection object 230 is displayed by an orange lamp, when the inspection object 230 is located at the inspection position and the visual inspection portion 280 photographs the inspection object 230, the inspection object 230 is inspected by a blue lamp, and when the inspection of the inspection object 230 is completed, the inspection object is displayed by a green lamp, and when an error occurs in the household appliance appearance inspection device 200 or the operation is disabled due to an abnormal factor, the inspection object is displayed by a red lamp, so that the current state of the household appliance appearance inspection device 200 is notified to a user. When an error or an accident occurs during the inspection and the household appliance appearance inspection device 200 is stopped, the user stops the inspection process by using the emergency stop button 270.
Fig. 3 is a diagram showing a state in which the inspection object 320 is fixed at the inspection position. The inspection object 320 is loaded on the inspection object loading unit 310 and transferred along the conveying unit 300. The transport unit 300 may be configured to transport the inspection object 320 to the inspection position, and to accurately align and fix the inspection object 320 at the inspection position.
In one embodiment, the conveying part 300 may include: a stopper 330 for stopping the advance of the inspection object loading unit 310 when it reaches the inspection position; an alignment part 340 for aligning the positions and directions of the inspection object loading parts 310; and a motor (not shown) for generating power for transferring the inspection object loading unit 310 on the conveying unit 300. The inspection object loading part 310 stably transfers the home appliances to the inspection position and performs alignment more easily. For example, the inspection object loading unit 310 may be a quadrangular tray that is easily aligned in units of lines, in a form and a material that supports the inspection object 320 flat and stably transfers the inspection object on the conveying unit 300.
Before the inspection object loading part 310 loading the inspection object 320 transferred by the transfer part 300 reaches the inspection position, the stopper 330 is raised to prevent the inspection object loading part 310 from advancing beyond the inspection position. For this purpose, the stopper 330 may include a position sensor or a proximity sensor for grasping the position of the inspection object loading part 310. In an embodiment, in a case where the inspection object 320 is stopped at the inspection position by the stopper 330, the conveying part 300 may be stopped. While the stopper 330 is shown in a flat floor shape in which the inspection object loading part 310 is placed in the forward direction in fig. 3, it is not limited thereto, and may take various shapes.
When the inspection object loading unit 310 is stopped by the stopper 330, the alignment unit 340 may align and fix the inspection object loading unit 310 and the inspection object 320 at the inspection position. In an embodiment, the alignment part 340 applies pressure to the inspection object loading part 310 at both sides to perform horizontal alignment of the inspection object 320, and the inspection object loading part 310 and the inspection object 320 may be fixed at the inspection position. The alignment part 340 adjusts the degree of pressurization according to the product information recognized by the recognition code reader.
The alignment unit 340 may be additionally provided with an alignment checking unit (not shown) for checking the alignment state of the inspection object loading unit 310 and the inspection object 320. An alignment inspection unit (not shown) measures the interval between the inspection object loading unit 310 and the alignment unit 340 and the degree of pixel alignment, and if the conditions are not satisfied, an error message can be provided to the inspection person by the inspection result output unit or the setting unit.
After the inspection object loading part 310 and the inspection object 320 are aligned at the inspection position to be fixed, the appearance inspection of the inspection object 320 based on the visual inspection part may be performed. After the appearance inspection of the inspection object 320 is completed, the alignment portion 340 will return to the home position and the stopper portion 330 will be lowered. Thereafter, the conveying unit 300 operates to convey the inspection object loading unit 310 and the inspection object 320 along the conveying unit 300 again. In one embodiment, the inspection object 320 may be transferred along the quality product transfer line or the defective product transfer line according to the inspection result.
Fig. 4 is a diagram showing a support frame 420 supporting the visual inspection portion 410. The home appliance appearance inspection apparatus 400 may include: a visual inspection part 410 for photographing an appearance of an inspection object; a support frame 420 for supporting the visual inspection unit 410 so that the visual inspection unit 410 moves in a vertical direction; and an inspection result output part 430 for displaying an appearance inspection result related to the inspection object. The support frame 420 may support the visual inspection portion 410 such that the visual inspection portion 410 moves in a vertical direction along the appearance of the inspection object and photographs the inspection object.
In one embodiment, the support frame 420 may include a position adjustment part (not shown) for moving the visual inspection part 410 in a vertical direction. The position adjustment part may include a motor (not shown) that generates power for vertically moving the visual inspection part 410. The support frame 420 may further include a guide rail (guide rail) for guiding the movement of the visual inspection portion 410 to prevent the visual inspection portion 410 from being separated from the path when moving vertically.
The visual inspection part 410 may vertically move along the support frame 420 and acquire an appearance image of the inspection object. The home appliance appearance inspection device 400 compares the image of the inspection object acquired by the visual inspection unit 410 with a standard image to detect surface defects of the inspection object. The household appliance appearance inspection device 400 determines whether or not the inspection object is a good or defective product based on the detected surface defect. The surface defect and quality defect judgment result detected in one embodiment may be output to the inspection result output unit 430 and confirmed by a user.
Fig. 5 is a diagram showing a detailed structure of the visual inspection unit 500.
The visual inspection portion 500 may include a plurality of visual portions 510, 520, 530, 540, 550. In an embodiment, the visual inspection part 500 may include: a first vision part 510 for photographing the front surface of the inspection object; a second vision part 520 for photographing the right side surface of the inspection object; a third vision part 530 for inspecting a left side surface of the inspection object; a fourth vision part 540 located between the first vision part 510 and the second vision part 520, for photographing a right corner of the inspection object; and a fifth vision part 550 located between the first vision part 510 and the third vision part 530 for photographing the left corner of the inspection object.
The first, second and third vision parts 510, 520 and 530 can horizontally move left and right on a frame supporting the vision inspection part 500, and the fourth and fifth vision parts 540 and 550 can be rotated at fixed positions. The first, second and third vision parts 510, 520 and 530 may include motors and rails for horizontal movement, and the fourth and fifth vision parts 540 and 550 may include motors and rotating plates for in-situ rotation.
Each of the vision portions 510, 520, 530, 540, 550 may include an image acquisition device, an illumination portion, a distance measurement portion, and a distance adjustment portion. The image acquisition device 552, the illumination unit 554, the distance measurement unit 556, and the distance adjustment unit 558 included in the fifth vision unit 550 are described in detail below. The image acquisition devices, illumination sections, distance measurement sections, and distance adjustment sections of the first to fourth vision sections 510 to 540 operate similarly to the image acquisition device 552, illumination section 554, distance measurement section 556, and distance adjustment section 558 of the fifth vision section 550, and thus detailed description thereof will be omitted.
The image acquisition device 552 may be a device for acquiring an image of an inspection object. The image acquisition device 552 has a sufficient resolution, frame rate, and Line rate (Line rate) required to detect appearance defects such as cracks, scratches, collapse, foreign matter, stains, paint peeling, play, and the like in the appearance of the inspection object. For example, the image acquisition device may be a high-resolution camera with a high Field Of View (FOV) setting.
In an embodiment, the image acquisition device 552 may be a Line scan (Line scan) camera that moves in a vertical direction and photographs an inspection object. In this case, the control section synthesizes the plurality of images captured by the image capturing device 552 into one image and modifies distortion or the like. As described above, the synthesized and modified image of the inspection object can be used to inspect whether the inspection object is defective or not by comparing with the standard image, and output to the inspection result output section together with the inspection result.
The illumination section 554 may include a light source that irradiates light to the detection object. In the visual inspection process, illumination has great influence on inspection quality, and poor appearance such as cracks, scratches, shriveling, foreign matters, stains, paint peeling, play and the like on the appearance of an inspection object is more highlighted. The image may be photographed differently according to the selection of the illumination unit 554, and thus the form, wavelength, color, angle, light amount, and the like of illumination may be changed according to the inspection environment and the inspection object. In one embodiment, the illumination portion 554 may be an organic light emitting diode illumination such as a surface illumination, a bar illumination.
The distance measuring unit 556 may measure the distance between the inspection object and the fifth vision unit 550. In one embodiment, the distance measuring unit 556 may be a laser distance sensor. The distance adjustment unit 558 moves the fifth vision unit 550 back and forth based on the distance information measured by the distance measurement unit 556, and thereby can adjust the distance between the inspection object and the fifth vision unit 550. The distance adjusting part 558 may include a motor for moving the fifth vision part 550 forward and backward.
In an embodiment, in case that the inspection object has a curvature due to Auto-Focus (Auto-Focus), the control part may adjust the distance between the fifth vision part 550 and the inspection object in real time to scan the inspection object. The autofocus inspection is performed in response to the bending of the product appearance, and when the visual inspection unit 500 moves in the vertical direction to capture an inspection object, the control unit drives the distance adjustment unit 558 in real time based on the distance information measured by the distance measurement unit 556 to maintain the distance between the fifth visual unit 550 and the inspection object at a predetermined distance.
The control section changes the inspection set values of the first to fifth vision sections 510 to 550 based on the product information of the inspection object recognized by the recognition code scanner. For example, the distance between the vision portion and the inspection object, the focal position of the image acquisition device, the illumination intensity of the illumination portion, the left-right positions of the first vision portion 510, the second vision portion 520, and the third vision portion 530, the rotation angles of the fourth vision portion 540, and the fifth vision portion 550, and the like may be changed.
In one embodiment, the front face image of the inspection object captured by the first vision unit 510 is stored in the first subordinate computer, the right side image and the left side image of the inspection object captured by the second vision unit 520 and the third vision unit 530 are stored in the second subordinate computer, and the right side corner image and the left side corner image captured by the fourth vision unit 540 and the fifth vision unit 550 are stored in the third subordinate computer. The control unit compares the front face image, the right side image, the left side image, the right side corner image, and the left side corner image of the inspection object stored in the first to third slave computers with the quality standard image (front face standard image, right side standard image, left side standard image, right side corner standard image, left side corner standard image) of the object product stored in the host computer to determine whether or not the inspection object is defective or defective (for example, a crack, a scratch, a collapse, a foreign matter, a stain, a paint peeling, a play, or the like).
Fig. 6 is a diagram of the scanning direction of the visual inspection unit 620 according to an embodiment of the present invention. As shown, the visual inspection part 620 may include: a vision unit for photographing the front surface of the inspection object; a vision part for photographing the right side surface of the inspection object; a vision part for inspecting the left side surface of the inspection object; a vision part for photographing a right corner of the inspection object; and a vision part for photographing a left corner of the inspection object. The visual inspection portion 620 may be supported by the support frame 630 so as to be movable in the vertical direction, and may be movable in the vertical direction along the support frame 630 by the visual inspection portion position adjustment portion 610.
In one embodiment, after the inspection object is aligned and fixed at the inspection position by the stopper portion and the alignment portion, the visual inspection portion 620 moves from the uppermost position to the lowermost position along the support frame 630 and starts to prepare for the appearance inspection. In this case, the product appearance inspection is started in a state where the visual inspection portion 620 is located at the lower end of the product, and the visual inspection portion 620 is lifted up along the supporting frame 630 (arrow direction of fig. 6) and the visual portion of the visual inspection portion 620 is made to simultaneously photograph the appearance of the front, left, right, left and right corners of the inspection object. For example, the visual inspection unit 620 rises along the support frame 630 for about 3 seconds and photographs the appearance of the inspection object.
When the visual inspection part 620 moves, the support frame 630 guides the vertical movement to prevent it from being separated from the path, so that the visual inspection part 620 can be supported. As shown, the support frame 630 may include 2 guide rails that support the visual inspection part 620 at one side and guide the vertical movement. In an embodiment, the visual inspection position adjustment portion 610 may include a motor that generates power for vertically moving the visual inspection portion 620.
Fig. 7 is a diagram showing an appearance inspection result screen 700 according to an embodiment of the present invention.
The appearance inspection result screen 700 may output to the inspection result output section and may provide the inspection person with the appearance inspection result. The first region 710 of the inspection result screen 700 may include 5-direction images (front image, left image, right image, left corner image, and right corner image) photographed through 5 visual parts. The detected position 720 of the poor appearance can be displayed on the image of the inspection object. For example, a defective appearance position of an inspection object such as a crack, a foreign matter, a stain, paint peeling, or the like can be displayed as a red dot on an image of the inspection object.
In one embodiment, the numerical statistics and final determination related to the visual inspection result may be displayed in the second area 730 of the inspection result screen 700. As shown in the drawing, the model number of the inspection object, the number of front defects of the inspection object, the number of defects on the left side surface, and the number of defects on the right side surface are displayed in the second area 730, and the final determination result of whether the inspection object is a good or defective product can be displayed. For example, the model number recognized by the reader and the number of bad detections such as cracks, scratches, collapse, foreign matter, stains, paint peeling, play of the front, left, and right sides are shown in detail, and the judgment result can be provided to the inspector.
Inspection statistics for products produced in the production line are displayed in a third region 740 of the inspection results screen 700. For example, the number of quality products, the quality product ratio, the number of defective products, and the defective ratio of the products inspected in the production line are displayed, so that the process state of the production line can be confirmed. In the third region 740, the states of the respective devices such as the image acquisition device, the illumination unit, the distance measuring unit, and the identification code reader can be shown. For example, when each device is in a normal state, a green circle is displayed, and when it is in a defective state, a red circle is displayed.
The system login is displayed in a fourth area 750 of the inspection result screen 700. In one embodiment, the appearance check history, the setting change content of the visual unit, the generation time, and the like, which are registered as a system, are stored and displayed.
Fig. 8 is a flow chart of an appearance inspection of a home appliance according to an embodiment of the present invention. In an embodiment, the inspection object may be a home appliance such as a refrigerator, a washing machine, an air conditioner. The appearance inspection of the home appliance may be started by warehousing the inspection object to the conveyor part and identifying the inspection object by the identification code reader (step 810). In one embodiment, the identification code may be an optical identification code such as a bar code that may be attached to the appearance of the inspection object. The control unit of the inspection device loads product information related to the inspection object identified by the identification code reader, and can change the photographing setting of the visual inspection unit based on the loaded product information.
When the inspection object enters the inspection position, the inspection object can be aligned and fixed at the inspection position by the stopper portion and the alignment portion (step 820). For this purpose, the inspection apparatus may include one or more sensors for detecting that the inspection object is approaching the inspection position, and the stopper may be raised to stop the advance of the inspection object when the inspection object is approaching the inspection position. When the inspection object loading unit is stopped by the stopper unit, the alignment unit applies pressure to both sides of the inspection object loading unit to perform alignment and accurately align and fix the inspection object loading unit at the inspection position.
If the inspection object is fixed at the inspection position, the visual inspection unit measures the distance from the inspection object to adjust the position of each visual part so as to match the adjustment shooting setting of the inspection setting based on the identified product information. In addition, when the visual portions of the left and right corners are photographed, the corner-side photographing angle can be changed according to the appearance of the product by being rotated in place.
When the inspection preparation is completed, the visual inspection unit moves in the vertical direction along the support frame and photographs the appearance of the inspection object (step 830). In one embodiment, the visual inspection portion moves from the lower end toward the upper end and photographs the appearance of the inspection object. In order to capture the appearance of an inspection object moving vertically up and down, the visual inspection section may include a plurality of line scanning cameras. For example, the visual inspection unit vertically moves up and down and photographs the front, left, right, left and right corners of the inspection object.
The control unit compares the image captured by the visual inspection unit moving in the vertical direction with the standard image to detect the appearance defect of the inspection object (step 840). In one embodiment, the control section compares the photographed front face image, left side face image, right side face image, left side corner image, and right side corner image with a front face standard image, left side face standard image, right side face standard image, left side corner standard image, and right side corner standard image stored in advance for the inspection object, respectively, to detect surface defects such as cracks, scratches, shrinkages, foreign substances, stains, paint peeling, play, and the like. The control unit determines whether the object is a good or a defective product based on the detected surface defect.
If the inspection is completed, the inspection result is output to the user, and the inspection object may be taken out of the warehouse (step 850). In one embodiment, the photographed images of the front, left side, right side, left side corner, and right side corner of the inspection object are output to the inspection result output unit, and the exact positions of the appearance defects are displayed on the photographed images. In addition, statistics of various defective forms and judgment results of quality products or defective products can be displayed. The inspection results are stored in the database, so that record management of the inspection quantity and the defective quantity and product production record management and additional management using the database can be realized.
Fig. 9 is a diagram showing a microscopic crack detection step in a photographed image. Part (a) of fig. 9 shows an appearance image of an inspection object photographed by the visual inspection section. Part (b) of fig. 9 shows the result of performing softening processing after emphasizing the shading of the image by adjusting the shading Contrast (Contrast) of the captured appearance image. In the case of an image with a contrast of brightness adjusted, there is a possibility of afterimage, and therefore, softening treatment for softening the image edge is performed to remove the afterimage.
Fig. 9 (c) shows a result of calculating a local binary high variable in an image in which contrast between bright and dark is emphasized and an afterimage is removed, and performing binarization. Wherein the local binary high variable can be automatically calculated according to the position of the portrait. Thereafter, the poor fracture property can be judged by calculating a binary large object (blob) area of the binary image. The detection size of the crack failure can be set.
Fig. 10 is a diagram showing a foreign matter inspection step in a photographed image. Part (a) of fig. 10 shows an appearance image of an inspection object photographed by the visual inspection section. Part (b) of fig. 10 shows a result of performing softening processing after emphasizing a light-dark difference of an image by adjusting a light-dark contrast of a captured appearance image. In the case of an image with a contrast of brightness adjusted, there is a possibility of afterimage, and therefore, softening treatment for softening the image edge is performed to remove the afterimage.
Part (c) of fig. 10 shows a result of performing binarization by calculating a local binary low variable in an image in which contrast between bright and dark is emphasized and an afterimage is removed. Wherein, the local binary low variable can be automatically calculated according to the position of the portrait. Then, the area is distinguished in the binarized image to extract a binary large object and calculate the area of the binary large object, thereby judging the presence or absence of foreign matter. Wherein the foreign matter defect detection size can be set.
Fig. 11 is a view showing an image 1100 of a front face of a home appliance determined to be a good. As shown in the figure, it was confirmed that no cracks, scratches, collapse, foreign matter, stains, paint peeling, play, and the like were found on the front surface of the quality product. Fig. 12 is a view showing a part 1200 of an image of the front face of the home appliance determined to be defective. As shown in the figure, surface defects such as scratches 1210 and cracks 1220 exist on the front surface of the defective product. The home appliance appearance inspection apparatus of the present invention detects the surface defects as described above by comparing the photographed image with the standard image or may detect the surface defects in the image by the image processing described with reference to fig. 9 and 10, or the like.
Fig. 13 is a diagram showing a visual portion of the left or right side of the subject to be inspected. As shown, the vision portion 1310 may include an image acquisition device 1312, an illumination portion 1314, a distance measurement portion 1316, and a distance adjustment portion 1318. The functions and operations of the image acquisition device 1312, the illumination unit 1314, the distance measurement unit 1316, and the distance adjustment unit 1318 may be the same as those of the image acquisition device 552, the illumination unit 554, the distance measurement unit 556, and the distance adjustment unit 558 shown in fig. 5.
As shown, the vision portion 1310 may move left and right on a frame 1320 of the vision inspection portion. In an embodiment, the vision portion 1310 may be additionally provided with a sub motor (not shown) and a decelerator (not shown) for moving left and right along the frame 1320. The vision part 1310 moves left and right on the frame 1320 and moves to a position suitable for photographing the inspection object using a sub motor and a decelerator.
In one embodiment, the visual portion 1310 may be additionally provided with a joint portion (not shown) for rotating the visual portion 1310 by 90 degrees. In this case, the vision part 1310 is rotated by 90 degrees by the joint part and horizontally moves left and right along the frame 1320 as needed and photographs the inspection object. As described above, the phenomenon in which the vision portion 1310 horizontally moves left and right and the inspection object is photographed may be referred to as a lateral scanning mode. Fig. 13 is an illustration of a visual portion 1310 for photographing the left or right side of the inspection object, and a sub motor, a decelerator, and a joint portion are similarly provided for the visual portion for photographing the front face of the inspection object, so that the front face of the inspection object can be photographed in the lateral scanning mode.
Fig. 14 is a diagram showing a visual portion 1410 that photographs a left or right corner of an inspection object. As shown, the vision portion 1410 may include an image acquisition device 1412, an illumination portion 1414, a distance measurement portion 1416, and a distance adjustment portion 1418. In the vision unit 1410, functions and operations of the image acquisition device 1412, the illumination unit 1414, the distance measuring unit 1416, and the distance adjusting unit 1418 may be the same as those of the image acquisition device 552, the illumination unit 554, the distance measuring unit 556, and the distance adjusting unit 558 shown in fig. 5.
As shown, the visual portion 1410 is rotatably secured to the frame 1420 of the visual inspection portion. In one embodiment, the vision unit 1410 may be additionally provided with a sub-motor (not shown) and a decelerator (not shown) for rotational movement. In this case, the vision part 1410 may be rotated in place using a sub-motor and a decelerator, thereby being configurable at an appropriate position for photographing a left or right corner according to an inspection object.
Fig. 15 is a flow chart of an appearance inspection of a home appliance having a metal surface according to an embodiment of the present invention. The appearance inspection may be performed by warehousing the inspection object with a conveyor belt (step 1510). The inspection object is put into the inspection device, and the identification code reader can identify the identification code applied to the inspection object put into the inspection device. In an embodiment, the inspection object in storage may be a household appliance having a metal surface. For example, the inspection object may be a household refrigerator, and a metal pattern in which minute concave portions and convex portions extending in a long manner are repeatedly arranged is formed on the front portion.
The control unit of the appearance inspection apparatus can determine whether the surface metal of the inspection object has a longitudinal pattern or a transverse pattern based on the identification code (step 1520). In the case of performing appearance photographing in a direction orthogonal to the surface metal pattern of the inspection object, an image in an overexposed state is photographed due to the influence of light reflected by the surface metal pattern (concave and convex) of the inspection object, and thus appearance inspection cannot be performed normally. Therefore, the apparent photographing direction of the inspection object may be different along the direction of the surface metal pattern of the inspection object.
When the control unit determines that the surface metal of the inspection object has a longitudinal pattern, the visual inspection unit may acquire an appearance image of the inspection object in the longitudinal scanning mode (step 1530). That is, as shown in fig. 6, in a state in which the plurality of vision portions are arranged in the horizontal direction, the vision inspection portion vertically moves along the support frame and photographs the inspection object. The image captured by the control unit is compared with a standard image (quality image) stored in the past to detect surface defects and determine whether the quality product or the defective product is good or not (step 1540).
In contrast, when the control unit determines that the surface metal of the inspection object has a transverse pattern, the visual inspection unit may acquire an external image of the inspection object in the transverse scanning mode (step 1550), that is, after the joint unit rotates the visual portion by 90 degrees, the visual portion may be moved transversely and photographed in a state in which the visual portion is vertically aligned. The control unit compares the captured image with a standard image (quality image) stored in the past to detect surface defects and determine whether the quality and the defective product are good or not (step 1560). When the inspection object photographing based on the horizontal photographing mode or the vertical photographing mode is completed and the inspection object is judged to be good or bad, the appearance inspection step is stopped and the inspection object is taken out (step 1570).
In the present specification, the present invention has been described with reference to some embodiments, and various modifications and alterations may be made without departing from the scope of the invention as understood by those skilled in the art. Such modifications and variations are intended to fall within the scope of the invention as claimed in the present specification.
Claims (6)
1. A household appliance appearance inspection device is characterized in that,
comprising the following steps:
a visual inspection unit for capturing an appearance of an inspection object;
a support frame for supporting the visual inspection unit so that the visual inspection unit can move in a vertical direction;
a control unit for moving the visual inspection unit in a vertical direction along the support frame and capturing an appearance of the inspection object;
a conveying unit configured to convey the inspection object;
an identification code reader for scanning an identification code attached to the inspection object to identify the inspection object when the inspection object moves on the conveying part; and
a joint part for rotating the visual inspection part by 90 degrees according to a transverse scanning mode and a longitudinal scanning mode,
the control unit judges whether or not the inspection object is defective based on the image obtained by the visual inspection unit,
The control unit loads product information on the identified inspection object, changes the photographing setting of the visual inspection unit based on the product information,
the control part judges the surface metal pattern direction of the inspection object based on the product information, and causes the visual inspection part to operate in a transverse scanning mode or a longitudinal scanning mode based on the judged surface metal pattern direction,
when the surface metal of the inspection object has a longitudinal pattern, the control unit moves the visual inspection unit in a vertical direction along the support frame in a longitudinal scanning mode to capture the appearance of the inspection object,
when the surface metal of the inspection object has a transverse pattern, the control unit rotates the joint unit by 90 degrees to move the visual inspection unit in a horizontal direction and capture the appearance of the inspection object.
2. The apparatus for checking the appearance of a household appliance according to claim 1, wherein,
the visual inspection unit includes:
an image acquisition device for acquiring an image of the inspection object;
an illumination unit configured to irradiate light to the inspection object;
A distance measuring unit configured to measure a distance between the inspection object and the visual inspection unit; and
and a distance adjusting unit configured to adjust a distance between the inspection object and the visual inspection unit.
3. The apparatus for checking the appearance of a household appliance according to claim 1, wherein,
the conveying section includes:
a stopper unit for stopping the inspection object so that the inspection object is positioned at an inspection position;
an alignment part for fixing and aligning the inspection objects stopped by the stop part,
the alignment parts are aligned by applying pressure to the inspection object stopped by the stopper part on both sides.
4. The apparatus for checking the appearance of a household appliance according to claim 1, wherein,
the visual inspection unit includes:
a first vision unit located on the front surface of the inspection object;
a second vision unit located on the left side of the inspection object;
a third vision unit located on the right side of the inspection object;
a fourth visual portion located between the first visual portion and the second visual portion; and
a fifth visual portion located between the first visual portion and the third visual portion,
The first visual portion, the second visual portion and the third visual portion can horizontally move left and right,
the fourth visual portion and the fifth visual portion are rotatable and movable at a fixed position.
5. The apparatus for checking the appearance of a household appliance as claimed in claim 4, wherein,
the first to fifth visual portions include:
an image acquisition device for acquiring an image of the inspection object;
an illumination unit configured to irradiate light to the inspection object;
a distance measuring unit for measuring a distance between the inspection object and the vision unit; and
a distance adjusting part for adjusting the distance between the inspection object and the vision part,
the control unit controls the distance adjusting unit based on the distance measured by the distance measuring unit as the visual inspection unit moves in the vertical direction.
6. The apparatus for checking the appearance of a household appliance according to claim 1, wherein,
further comprises an inspection result output part for displaying the appearance inspection result related to the inspection object,
the control unit outputs the image captured by the visual inspection unit to the inspection result output unit at a defective display position.
Applications Claiming Priority (2)
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|---|---|---|---|
| KR10-2019-0022358 | 2019-02-26 | ||
| KR1020190022358A KR102121142B1 (en) | 2019-02-26 | 2019-02-26 | Home appliance surface inspection apparatus |
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| CN111610190A CN111610190A (en) | 2020-09-01 |
| CN111610190B true CN111610190B (en) | 2023-11-14 |
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| CN201910878711.1A Active CN111610190B (en) | 2019-02-26 | 2019-09-18 | Appearance inspection device for household appliances |
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| KR (1) | KR102121142B1 (en) |
| CN (1) | CN111610190B (en) |
| WO (1) | WO2020175752A1 (en) |
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| CN112557401B (en) * | 2020-12-01 | 2023-03-14 | 北京先见科技有限公司 | Linear array scanning visual detection equipment |
| KR102321444B1 (en) * | 2021-04-29 | 2021-11-04 | (주)티에이치엔 | Wiring product inspection support apparatus |
| KR20240030907A (en) | 2022-08-29 | 2024-03-07 | (주)휴넷가이아 | Automatic Detection System for Surface Defects of Test Subjects Based on Machine Vision |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53144220A (en) * | 1977-05-23 | 1978-12-15 | Hitachi Ltd | Automatic adjuster for color purity of color television |
| US7570794B2 (en) * | 2005-09-02 | 2009-08-04 | Gm Global Technology Operations, Inc. | System and method for evaluating a machined surface of a cast metal component |
| KR101303050B1 (en) * | 2009-07-15 | 2013-09-04 | 주식회사 포스코 | Apparatus for inspecting surfaces and method for inspecting surfaces using it |
| KR101863572B1 (en) * | 2014-09-10 | 2018-06-01 | 야마하하쓰도키 가부시키가이샤 | External appearance inspection device and substrate inspection device |
| KR20170107952A (en) * | 2015-01-29 | 2017-09-26 | 가부시키가이샤 데크시스 | Optical appearance inspection device and optical appearance inspection system using same |
| KR101611822B1 (en) * | 2015-12-18 | 2016-04-12 | (주)이엠시스템 | Visual inspection apparatus |
| KR101772673B1 (en) * | 2017-05-13 | 2017-08-29 | 주식회사 에이피에스 | Multiple optics vision inspection system |
| CN108672318B (en) * | 2018-04-17 | 2020-06-16 | 江苏理工学院 | Appearance detection device based on machine vision |
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2019
- 2019-02-26 KR KR1020190022358A patent/KR102121142B1/en active IP Right Grant
- 2019-08-13 WO PCT/KR2019/010264 patent/WO2020175752A1/en active Application Filing
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| WO2020175752A1 (en) | 2020-09-03 |
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