JP4150563B2 - Appearance image automatic inspection system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an external appearance image automatic inspection system having an external appearance image developing mirror device that enables inspection of a plurality of surfaces provided on a workpiece from one direction.
[0002]
[Prior art]
The conventional external appearance image developing mirror device 9A shown in FIG. 11 includes three mirrors 3 so as to surround the inspection portion of the workpiece 1 from three directions, and by viewing these three mirrors 3 from above, The work 1 is configured such that both side surfaces 1A, 1A facing the different directions and the front end surface 1B can be inspected at a time (for example, see Patent Document 1).
[0003]
As shown in FIG. 12 , another conventional appearance image developing mirror device 9 </ b> B includes an annular mirror 6 that covers the outside of the work 5, and the outer peripheral surface 5 </ b> A of the work 5 reflected on the mirror 6 is disposed on the mirror 6. It is configured to be captured by a camera provided above (see, for example, Patent Document 2). Thereby, the outer peripheral surface 5A of the workpiece 5 can be inspected from one direction at a time. In the figure, reference numeral 7 denotes a light for illuminating the outer peripheral surface 5A of the workpiece 5. As other conventional appearance image developing mirror devices, those disclosed in Patent Documents 3 and 4 are known.
[0004]
[Patent Document 1]
JP 2002-48716 A (paragraph [0060], FIG. 5)
[Patent Document 2]
Japanese Patent Laid-Open No. 11-44650 (paragraph [0007], FIG. 1)
[Patent Document 3]
Japanese Patent No. 2726808 (Claim 1, paragraph [0026], FIG. 1)
[Patent Document 4]
Japanese Patent No. 3153476 (Claim 1, paragraphs [0017] [0043], FIG. 1, FIG. 4, FIG. 18)
[0005]
[Problems to be solved by the invention]
However, in the above-described conventional appearance image developing mirror device 9A (9B), the work 1 (5) is surrounded by the mirror 3 (6), so that the next work is set in the appearance image developing mirror device. Therefore, either a workpiece or a mirror must be reciprocated, and a plurality of workpieces could not be inspected and inspected efficiently.
[0006]
The present invention has been made in view of the above circumstances, and an object thereof is to provide a possible outer licorice automated inspection system to a plurality of workpiece efficiently inspect inspection.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, an automatic external appearance image inspection system according to the invention of claim 1 includes a conical mirror formed by mirror-finishing the outer surface of a conical member tapered upward, and a conical mirror. An annular mirror formed by reducing the inner surface of the annular member surrounding the shape mirror in a tapered shape toward the upper side and having a mirror finish, and supporting the cone-shaped member and the annular member from below, and disposing them above the workpiece it and a mirror jig, the annular mirror as viewed from the cone-shaped mirror in the state in which the workpiece under the conical mirror appearance image viewed workpiece obliquely from the entire lateral mirrored, viewed from above and an outer licorice deployment mirror device conically mirror Ru mirrored appearance image reflected in annular mirror, beneath the conical mirror, the workpiece conveying means for sequentially conveying a plurality of workpieces, the conical mirror Located above and reflected on the cone mirror Equipped with a camera that captures the appearance image of each workpiece as image data and an image processing device that detects the presence or absence of an abnormality in the appearance of the workpiece based on the image data. The mirror jig is fitted with the lower edge of the cone-shaped member An inner ring, an outer ring that surrounds the outer side of the inner ring and is fitted with a lower edge of the ring-shaped member, a reinforcing body that joins the inner ring and the outer ring, and an outer ring or a hung from the reinforcing body It is composed of a plurality of legs and is characterized in that the distance between adjacent legs is larger than the workpiece .
[0008]
The invention of claim 2 is characterized in that in the appearance image automatic inspection system according to claim 1, the mirror jig is formed of a light-transmitting member .
[0009]
According to a third aspect of the invention, in the appearance image automatic inspection system according to the first or second aspect, a through hole for end face inspection is formed in the axial center portion of the cone-shaped member so as to directly inspect a part of the workpiece. It has the characteristics.
[0010]
According to a fourth aspect of the present invention, in the automatic appearance image inspection system according to any one of the first to third aspects , the workpiece is controlled based on a control signal output from the image processing apparatus, and a workpiece is determined to be defective depending on whether there is an abnormality. And a normal product.
[0011]
According to a fifth aspect of the present invention, in the automatic external appearance image inspection system according to any one of the first to fourth aspects, a work detection means is provided for detecting whether or not the work is disposed opposite to the external appearance image developing mirror device. When the means detects a workpiece, the workpiece conveying means is in a standby state, and the image processing apparatus is configured to detect whether there is an abnormality in the appearance of the workpiece based on the image data captured by the camera at that time. Have.
[0012]
[Action and effect of the invention]
<Invention of Claim 1>
In the external appearance image automatic inspection system according to claim 1, the conical member and the ring-shaped member are fitted to the inner and outer rings provided in the mirror jig, thereby easily aligning both the conical and ring-shaped mirrors. It can be carried out. Then, when the work is placed below the cone mirror and the cone mirror is photographed from above with the camera placed above the cone mirror, the appearance image of the workpiece seen from all sides is seen from the ring mirror. The image is reflected on the conical mirror and captured by the camera as image data. Here, since the appearance image developing mirror device is supported by the mirror jig and disposed above the work, it does not surround the work unlike the conventional appearance image developing mirror device. Further, since the interval between adjacent legs of the plurality of legs in the mirror jig is larger than the work, a plurality of works are sequentially passed between the legs of the mirror jig by the work conveying means. It can be conveyed below the mirror. This makes it possible to efficiently inspect the workpiece for abnormality.
[0013]
<Invention of Claim 2>
In the appearance image automatic inspection system according to the second aspect, since the mirror jig is formed of a translucent member, it is possible to prevent the appearance image of the workpiece from being blocked by the mirror jig.
[0014]
<Invention of Claim 3>
In the automatic external appearance image inspection system according to claim 3, a part of the workpiece (for example, the end surface of the workpiece or the back surface of the recess provided in the workpiece) can be directly observed through the end surface inspection through hole formed in the conical member. it can.
[0015]
<Invention of Claim 4 >
In the external appearance image automatic inspection system according to the fourth aspect , since the workpiece is classified into a defective product and a normal product according to the presence or absence of abnormality, only normal workpieces can be efficiently collected.
[0016]
<Invention of Claim 5 >
In the appearance image automatic inspection system according to claim 5 , when the work is placed opposite to the appearance image developing mirror device, the work becomes stationary and the appearance image is captured by the camera. Compared with the case of processing, the accuracy of image processing is improved.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
<First Embodiment>
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 10.
The appearance image developing mirror device 50 of this embodiment includes an annular member 10, a cone member 20, and a mirror jig 30.
[0018]
The conical member 20 hangs down the cylindrical portion 22 from the center of the lower surface of the truncated cone 24 tapered upward in FIG. 1, and the end face inspection through hole 23 is formed in the axial center portion of the conical member 20. Is formed through. Moreover, the cone-shaped member 20 of this embodiment is comprised, for example with the metal, and the cone-shaped mirror 21 which concerns on this invention is formed by mirror-finishing the outer surface of the truncated cone 24. FIG.
[0019]
The ring-shaped member 10 has an annular shape surrounding the conical mirror 21, and the inner surface of the ring-shaped member 10 has a tapered structure with a diameter reduced in the same direction as the tapered direction of the truncated cone 24. The inner surface of the annular member 10 is mirror-finished to form the annular mirror 11 according to the present invention.
[0020]
As shown in FIG. 2, the mirror jig 30 includes an inner ring 31 and an outer ring 32 arranged concentrically. For example, four reinforcing bodies 35 are provided between the inner ring 31 and the outer ring 32. It has been joined to. As shown in FIG. 3, the inner ring 31 is sized to fit the lower edge portion of the conical member 20 (specifically, the lower edge portion of the cylindrical portion 22), and a stepped portion 33 is formed on the inner side. Thus, the lower end surface of the conical member 20 is abutted against the stepped portion 33. On the other hand, the outer ring 32 has such a size that the lower edge portion of the annular member 10 is fitted, and the lower end surface of the annular member 10 abuts against the reinforcing body 35 that connects the inner ring 31 and the outer ring 32. It is done.
[0021]
Four legs 34 are suspended downward from four locations of the outer ring 32. Here, the distance between the adjacent legs 34, 34 is equal to the distance L1 between the legs 34, 34 adjacent in the vertical direction in FIG. The distance L2 between them is wider.
[0022]
Next, the operation and effect of this embodiment configured as described above will be described.
As shown in FIG. 3, when a work 90 is placed on a predetermined flat surface as a work placement surface 36 and an appearance image of the work 90 is taken into the camera 19, the appearance image developing mirror of this embodiment is used. A device 50 can be used.
[0023]
For example, as shown in FIG. 4, the workpiece 90 has a cylindrical shape with a bottom at the top, and marks “◯” and “Δ” are printed on the upper end surface 90 </ b> A of the workpiece 90. Characters “A”, “B”, “C”, and “D” are printed at positions where the surface 90B is equally arranged.
[0024]
The appearance image developing mirror device 50 is set between the camera 19 and the workpiece placement surface 36 in order to efficiently perform the inspection inspection of the workpiece 90. Specifically, as shown in FIG. 3, the mirror jig 30 is disposed on the workpiece placement surface 36, the conical member 20 is fitted in the inner ring 31 of the mirror jig 30, and the outer side The ring-shaped member 10 is fitted in the ring 32. As a result, the conical mirror 21 provided in the conical member 20 and the annular mirror 11 provided in the annular member 10 are positioned at regular relative positions, and the conical mirror 21 and the annular mirror 11 are placed on the workpiece placement surface. It is held at a position away from 36 by a certain distance.
[0025]
Next, the lens of the camera 19 is disposed above the axis of the conical member 20.
Next, the workpiece 90 is set. Specifically, the workpiece 90 is inserted into the workpiece arrangement space 38 below the cone-shaped mirror 21 and the ring-shaped mirror 11 from between the legs 34, 34 in the mirror jig 30, and just below the cone-shaped mirror 21. The work 90 is placed. At this time, the insertion work can be easily performed by inserting the workpiece 90 from the frontage (the frontage indicated by reference numeral L2 in FIG. 2) where the distance between the legs 34, 34 is wide.
[0026]
Next, a plurality of lights 37 provided so as to surround the mirror jig 30 are turned on. Then, light passes between the legs 34 and 34 and is irradiated onto the work 90, and an external appearance image of the work 90 is reflected by the annular mirror 11 and the conical mirror 21, and is reflected on the camera 19 side. Here, in the conventional external image developing mirror device, since the work is surrounded by the mirror, the light from the surroundings to the work is blocked by the mirror. In the present embodiment, the work is interposed between the legs 34, 34. 90 can be easily irradiated with light, so that a clear appearance image can be projected, and the workpiece 90 can be illuminated with natural light.
[0027]
FIG. 5 shows an example of an image captured by the camera 19 when the conical member 20 is viewed from above. As shown in the figure, an external appearance image of the upper end surface 90A of the work 90 is taken into the camera 19 through the end surface inspection through hole 23 formed in the axial center portion of the conical member 20, and also on the outer surface of the conical member 20. An external appearance image in which the outer peripheral surface 90 </ b> B of the work 90 is developed is reflected on the provided conical mirror 21 and is captured by the camera 19.
[0028]
Specifically, as shown in FIG. 3, the annular mirror 11 faces the outer circumferential surface 90 </ b> B of the workpiece 90 from all sides obliquely, and the entire circumferential surface of the annular mirror 11 viewed from the cone-shaped mirror 21 The outer peripheral surface 90 </ b> B of 90 is projected, and this appearance image is reflected by the conical mirror 21 toward the camera 19. Then, as shown in FIG. 5, an image in which the upper end surface 90 </ b> A and the outer peripheral surface 90 </ b> B of the work 90 are two-dimensionally developed is captured by the camera 19. For example, the image captured by the camera 19 is subjected to image processing by a computer (not shown), and whether or not the prints (“◯”, “Δ”, “A” to “D”) are correctly printed on the work 90 and scratches. The presence or absence, etc. are checked.
[0029]
Here, in this embodiment, since both the conical mirror 21 and the ring-shaped mirror 11 have a conical surface, it is possible to observe a smooth appearance image without a boundary portion between the mirrors 11 and 21. However, in this embodiment, the appearance image is blocked by the reinforcing body 35 of the mirror jig 30 (see reference numeral 35 in FIG. 5). In view of this, if the mirror jig 30 is made of a translucent member, it is possible to prevent the appearance image of the workpiece 90 from being blocked by the mirror jig 30, as shown in FIG. It is also possible for light to pass through the legs 34 of the tool 30 to irradiate the work 90 with light uniformly.
[0030]
When replacing the workpiece 90 with the next workpiece 90, for example, the workpiece 90 that has undergone inspection inspection is moved to one side from between the legs 34, 34 and removed, and the next workpiece 90 is removed from the other side. It arrange | positions under the cone-shaped mirror 21 through the leg bodies 34 and 34. FIG. Here, for example, the work placement surface 36 is configured by a conveyor, and the mirror jig 30 is set so as to straddle the conveyor, thereby further improving the efficiency of the inspection inspection. That is, a plurality of workpieces 90 are arranged on the conveyor at intervals, the conveyor is moved in one direction, and the conveyor is temporarily stopped as necessary, so that the plurality of workpieces 90 can be inspected efficiently and sequentially. Can do.
[0031]
As described above, according to the appearance image developing mirror device 50 of the present embodiment, when the conical mirror 21 faces the conical mirror 21 from the side opposite to the work 90 with the conical mirror 21 in between, the external appearance of the work 90 viewed from diagonally all sides. The image can be viewed from the ring-shaped mirror 11 on the cone-shaped mirror 21. That is, all side surfaces of the workpiece 90 can be inspected from one direction at a time. In addition, since the workpiece 90 is arranged away from the conical mirror 21 and the annular mirror 11 in the axial direction, the workpiece is not surrounded by the mirror as in the prior art, and the degree of freedom in the movement direction of the workpiece 90 is high. Become. Thereby, it becomes possible to move the some workpiece | work 90 smoothly, and the efficiency of inspection inspection can be improved.
[0032]
Further, in the appearance image developing mirror device 50 of the present embodiment, since the annular mirror 11 has a tapered structure corresponding to the cone mirror 21, the cone mirror 21 can be disposed inside the annular mirror 11, The whole can be made compact. Specifically, as shown in FIG. 7A, when the annular mirror 11 has a cylindrical surface in which the inner diameter is constant in the axial direction, the appearance image of the workpiece 90 is symmetrical with the workpiece 90 with the annular mirror 11 in between. It is projected toward the opposite position. On the other hand, in the present embodiment, as shown in FIG. 7B, the annular mirror 11 has a tapered structure, so that an external appearance image of the workpiece 90 is projected inside the annular mirror 11. Thereby, the cone-shaped member 20 is arrange | positioned inside the annular mirror 11, and the external appearance image expansion | deployment mirror apparatus 50 becomes a compact structure in an axial direction.
[0033]
Contact name workpiece 90 of this embodiment, it had a cylindrical shape, the workpiece may be any shape. Further, as shown in FIG. 8, the conical member 20 may not have the end face inspection through hole. In the above embodiment, the conical member 20 has a conical shape, but may have a pyramid shape.
[0034]
FIG. 9 and FIG. 10 show an embodiment of an appearance image automatic inspection system 80 including the appearance image developing mirror device 50 and the camera 19 described above .
[0035]
Below the appearance image developing mirror device 50 is provided a belt conveyor 81 as a “work conveying means” of the present invention, and a motor 82 as a power source of the belt conveyor 81 is driven by a conveyor drive circuit 83. On the belt conveyor 81, the plurality of workpieces 90 (see FIG. 4) described above are placed in a line in the conveying direction with a predetermined interval.
[0036]
On the side of the belt conveyor 81, for example, a photoelectric sensor 84 is provided as a work detection means. When the workpiece 90 is positioned below the appearance image developing mirror device 50, a workpiece detection signal is output from the sensor 84.
[0037]
The camera 19 captures the appearance image of the work 90 as image data (see FIG. 5) and outputs the image data to the image processing device 85. When receiving an image processing command from the main controller 86, the image processing device 85 performs image processing on the image data, and prints correctly on the workpiece 90 (“◯”, “Δ”, “A” to “D”). It is checked whether it has been done and whether there are any scratches.
[0038]
When the main controller 86 receives a workpiece detection signal from the sensor 84, the main controller 86 outputs an image processing command to the image processing device 85 and outputs a conveyor stop command for stopping the belt conveyor 81 to the conveyor drive circuit 83. As a result, when the work 90 is disposed opposite to the appearance image developing mirror device 50, the belt conveyor 81 is in a standby state, and the appearance image of the work 90 in a stationary state can be taken into the camera 19, and the image processing device 85 Image processing accuracy is improved.
[0039]
A non-defective chute 87 is provided at the end of the belt conveyor 81. Then, the workpiece 90 (normal product) having no abnormality is collected from the end portion of the belt conveyor 81 to the non-defective product chute 87 and sent to the next process. On the other hand, the workpiece 90 (defective product) in which an abnormality has been found is removed to the side of the belt conveyor 81 by an exclusion lever 88 provided at the end portion of the belt conveyor 81 and collected in an NG collection unit (not shown) provided there. . More specifically, when an NG product removal command is output from the main controller 86 to the lever driving device 89, the removal lever 88 is driven, and thereby the workpiece 90 is removed as a defective product (NG product). Further, the image processing device 85 outputs an abnormality detection signal to the main controller 86 when the printing abnormality or scratch of the workpiece 90 is found in the image processing, and the main controller 86 receives the abnormality detection signal from the image processing device 85. Output an NG product exclusion command.
[0040]
Next, a description of the operation of the external appearance image automatic inspection system 80 with reference to the flowchart of FIG. 10. When the appearance image automatic inspection system 80 is activated, the belt conveyor 81 conveys the workpiece 90 one pitch at a time (S1), and this pitch feed is repeated until the sensor 84 outputs a workpiece detection signal (No loop in S2). .
[0041]
When the workpiece 90 moves to a position facing the appearance image developing mirror device 50 (Yes in S2), a workpiece detection signal is output from the sensor 84, and one pitch by the belt conveyor 81 is not performed. That is, the belt conveyor 81 is stopped. Then, image data is taken in from the camera 19 to the image processing device 85, and whether or not there is a printing abnormality and a scratch on the workpiece 90 is checked by image processing (S3).
[0042]
Here, when a printing abnormality or a scratch is found (Yes in S4), an NG product removal command is output from the main controller 86 to the lever driving device 89, and the NG product work 90 is moved to the belt conveyor 81 side by the removal lever 88. Are collected in the NG recovery section. On the other hand, when no printing abnormality or scratch is found (No in S4), the belt conveyor 81 is sent again by one pitch. Then, when the next workpiece 90 is positioned below the appearance image developing mirror device 50, the previous workpiece 90 falls onto the non-defective chute 87 and is collected. Thereafter, this operation is repeated.
[0043]
According to the appearance image automatic inspection system 80 of the present embodiment described above, the appearance image developing mirror device 50 is disposed between the camera 19 and the workpiece 90, so that the appearance image of the workpiece 90 at a time from one direction is used as image data. Can be captured. In addition, since the appearance image developing mirror device 50 according to the present embodiment does not surround the workpiece 90 as in the prior art, a plurality of workpieces 90 can be quickly moved by the belt conveyor 81, and the workpiece 90 is abnormal. Inspection can be performed efficiently.
[0044]
The present invention is not intended to be limited before you facilities embodiment can be implemented with various modifications within a scope not departing from the gist.
[Brief description of the drawings]
[0045]
FIG. 1 is an exploded side sectional view of an appearance image developing mirror device according to a first embodiment of the present invention. FIG. 2 is a plan view of a mirror jig. Perspective view of workpiece [Fig. 5] Appearance image of workpiece visible through external image developing mirror device [Fig. 6] Appearance image of workpiece when workpiece jig is transparent [Fig. 7] (A) Cylindrical structure of ring mirror sectional side view in a case in which the, (B) a side sectional view and FIG. 8 when the annular mirror and the taper structure side sectional view showing a modification of the appearance image expansion mirror device 9 appearance image automatic inspection system FIG . 10 is a flowchart showing the operation of the appearance image automatic inspection system . FIG. 11 is a perspective view of a conventional appearance image developing mirror device. FIG. 12 is a side of a conventional appearance image developing mirror device. Sectional view [Explanation of symbols]
[0046]
DESCRIPTION OF SYMBOLS 1 ... Ring member 11 ... Ring mirror 20 ... Conical member 21 ... Conical mirror 23 ... Through hole for end surface inspection 30 ... Mirror jig 31 ... Inner ring 32 ... Outer ring 34 ... Leg body 35 ... Reinforcing body 50 ... Appearance image developing mirror device 80 ... Automatic appearance image inspection system 81 ... Belt conveyor (work conveying means)
84 ... Sensor (work detection means)
85 ... Image processing device 87 ... Non-defective chute (sorting means)
88 ... Exclusion lever device (sorting means)
89 ... NG product discharge device (sorting means)
9 0 ... Work

Claims (5)

A conical mirror formed by mirror-finishing the outer surface of a conical member that is tapered upward, and an inner surface of an annular member that surrounds the conical mirror is tapered in a tapered shape and has a mirror surface. A ring-shaped mirror that is finished; and a mirror jig for supporting the cone-shaped member and the ring-shaped member from below and disposing the workpiece above the workpiece. The workpiece is disposed below the cone-shaped mirror. the said ring-shaped mirror as viewed from the front Kikirigata mirrors arranged state the workpiece appearance image viewed obliquely from all sides mirrored, said reflected in the annular mirror on the conical mirror as viewed from above an outer licorice deployment mirror device appearance image Ru mirrored,
A workpiece conveying means for sequentially conveying a plurality of workpieces below the conical mirror;
A camera that is arranged above the cone-shaped mirror and captures an external appearance image of each workpiece reflected on the cone-shaped mirror as image data;
An image processing device that detects the presence or absence of an abnormality in the appearance of the workpiece based on the image data;
The mirror jig includes an inner ring to which a lower edge portion of the conical member is fitted, an outer ring that surrounds the outer side of the inner ring and to which the lower edge portion of the annular member is fitted, and the inner ring. And a plurality of legs suspended from the outer ring or the reinforcing body, and the distance between the adjacent legs is larger than that of the workpiece. Appearance image automatic inspection system characterized by that . The appearance image automatic inspection system according to claim 1, wherein the mirror jig is formed of a translucent member. 3. The automatic appearance image inspection system according to claim 1, wherein an end face inspection through hole is formed in an axial center portion of the conical member to directly inspect a part of the workpiece . 4. A classifying unit that is controlled based on a control signal output from the image processing apparatus and classifies the workpiece into a defective product and a normal product according to the presence or absence of the abnormality. An appearance image automatic inspection system according to any one of the above. Work detection means for detecting whether or not the work is placed opposite to the appearance image developing mirror device is provided, and when the work detection means detects the work, the work transport means is in a standby state and then the work The appearance image automatic inspection system according to any one of claims 1 to 4, wherein the image processing device is configured to detect the presence or absence of an abnormality in the appearance of the workpiece based on image data captured by a camera. .

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