JP5357931B2 - Parts inspection system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for inspection part flaw which detects the presence of flaws on the surface of a nut, with the light reflected from the surface of the nut. <P>SOLUTION: The device 1 for inspecting part flaw includes projection devices 27a and 27b which project light onto inspection object parts arranged at predetermined positions, and CCD cameras 29a and 29b disposed at positions to receive reflected light from the inspection object parts. The device 1 for inspecting part flaw is configured to fetch the reflection states of the inspection object parts as image information by the CCD cameras 29a and 29b, and to determine presence of flaws on the surfaces of the inspection object parts based on the image information. The device 1 for inspecting part flaw is provided with rotating tables for mounting and rotating the inspection object parts, and is configured to fetch the reflection states of the inspection object parts at each predetermined rotation angle by the CCD cameras 29a and 29b while the rotating tables 24a and 24b are rotated. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a component flaw detection apparatus that detects the presence or absence of a flaw on the surface of a component to be inspected from reflected light reflected from the surface of the component to be inspected such as a nut with a hook.

  Conventionally, when detecting whether or not a component having a smooth surface, particularly a component having a curved surface, is scratched, a projector is disposed obliquely in front of the component to be inspected, and the scratch on the component surface is shaded. On the other hand, it is common to use a CCD camera placed in front of the part, and the CCD camera captures the reflection state on the surface of the part to be inspected as image information and determines the presence or absence of scratches from this image information. It is the target.

Japanese Patent Laid-Open No. 11-83756

  In the above apparatus, when inspecting the entire peripheral surface of a part, it takes time to inspect due to the rotation of the part, and it is difficult to inspect a large number of parts in a short time.

  Moreover, when rejecting defective products from the inspection results, the guide table that forms the guide path of the parts is slid to provide a defective product exclusion port, and defective products are excluded from this defective product removal port. A mechanism for sliding must be attached to the device, which impairs the appearance of the device.

  In addition, when determining the presence or absence of a flaw in a female screw portion such as a nut, there is a method for determining a part of the female screw portion, but there is no method for inspecting the entire surface of the female screw portion.

  The present invention has been created in view of the above-described problems, and a projector for irradiating light to a component to be inspected arranged at a predetermined position is disposed and a CCD camera is provided at a position for receiving reflected light of the component to be inspected. Is a component flaw inspection apparatus configured to capture the reflection state of a component to be inspected as image information with a CCD camera and determine the presence or absence of a flaw on the surface of the component to be inspected from this image information. It is characterized in that a turntable that is placed and rotated is provided, and the reflection state of the component to be inspected is captured at a predetermined rotation angle by the CCD camera while the turntable is rotated. The turntable may have a magnetic force that attracts the component to be inspected.

  In addition, a holding table having the same surface as the rotating table and an index table that rotates along the holding table are arranged, and a storing groove is provided on the outer periphery of the index table for each predetermined division angle. You may comprise so that it may stop on a turntable, and you may arrange | position the chute | shoot part which guides a to-be-inspected part to the accommodation groove | channel of an index table.

  Furthermore, the index table may be arranged on both sides of the chute part, and the parts to be inspected may be arranged by a distribution lever arranged near the tip of the chute part.

  In addition, the holding table is provided with a defective product exclusion groove, a bottom plate located on the same plane as the holding table is disposed in the defective product exclusion groove, and the bottom plate is configured to rotate downward from the holding table. Also good.

  In addition, a CCD camera provided with a light projecting device is disposed obliquely above the turntable, and the reflection state of the female thread portion of the component to be inspected is captured by the CCD camera at every predetermined rotation angle while the turntable rotates. May be.

  According to the component flaw inspection apparatus of the present invention, since it has a turntable for placing and rotating a component to be inspected, a predetermined rotation angle with a portion having a large shade of an image of a flawed portion and a surface without a flaw as an inspection area. By taking in every time, the entire circumference of the part to be inspected can be smoothly inspected.

  When the index table is arranged so that the part to be inspected is taken out from the chute portion, the inspection can be performed while minimizing the part supply time. Further, when the index tables are arranged on both sides of the chute and the parts to be inspected are alternately sent to these index tables, the inspection can be performed in two systems, so that the entire circumference of the parts to be inspected can be obtained. Although the inspection takes time, the inspection time can be substantially halved. In addition, when a defective product exclusion groove is provided in the holding table and a rotatable bottom plate is arranged in the defective product exclusion groove, the drive unit of the bottom plate can be attached to the lower surface of the holding table, and the appearance of the device is impaired. There is no. In addition, when the CCD camera is disposed obliquely above the turntable, the reflection state of the female thread portion can be captured at every predetermined rotation angle while the turntable rotates, so that the entire surface of the female screw portion of the part to be inspected can be obtained. The presence or absence of scratches can be determined.

The principal part top view of the component damage inspection apparatus which concerns on this invention. The principal part front view which notched a part of the components flaw inspection apparatus which concerns on this invention. The principal part enlarged view of the turntable which concerns on this invention. Explanatory drawing of the attachment state of the CCD camera which concerns on this invention. Operation | movement explanatory drawing of the component damage inspection apparatus which concerns on this invention. Operation | movement explanatory drawing of the baseplate which concerns on this invention.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. 1 and 2, reference numeral 1 denotes a component flaw inspection apparatus, in which a base plate 2 is attached to a base (not shown) via a first spacer 1a. A holding base 3 is attached to the base plate 2 via a second spacer 2a, and a chute mounting groove (not shown) is provided near the center of the holding base 3. In this chute mounting groove, the chute part 4 of the component supply feeder (not shown) is arranged so as not to come into contact with the holding table 3, so that the vibration of the chute part 4 is not transmitted to the holding table 3. . The chute 4 has a side wall for guiding a hooked nut 5 (hereinafter referred to as a nut) as an example of a part to be inspected, and the nuts 5 supplied from the component supply feeder are aligned in a row with the hook up. It is configured to be supplied. Further, a transfer table 4 a having a flat surface without a side wall is provided at the tip of the chute 4, and the upper surface of the transfer table 4 a is located on the same surface as the upper surface of the holding table 3 and will be described later. It is configured to be able to communicate with the storage grooves 8a and 8b.

  The holding table 3 is provided with index tables 7a and 7b located on both sides of the chute 4 and via first bearings 6a and 6b. A predetermined division is provided near the outer periphery of the index tables 7a and 7b. A plurality of storage grooves 8a and 8b each having a U shape for each corner are provided. The index tables 7a and 7b are connected to table drive motors 10a and 10b fixed to the base plate 2 via first couplings 9a and 9b, respectively. The table drive motors 10a and 10b are configured to rotate at predetermined division angles and stop the storage grooves 8a and 8b at each station upon completion of a flaw inspection which will be described later or defective product elimination which will be described later. The stations of the index tables 7a and 7b are a transfer station at a side surface position of the transfer table 4a, an inspection station at a position orthogonal thereto, a defective product exclusion station at a position orthogonal to the inspection station, It consists of a non-defective product discharge station and other empty stations. Furthermore, thin plate-like first guide plates 11a, 11b and second guide plates 12a, 12b having arcuate surfaces concentric with the index tables 7a, 7b are attached to the holding table 3, and these guide plates 11a. , 11b, 12a, 12b and auxiliary guides 32a, 32b, which will be described later, guide the nut 5 to non-defective products discharge grooves 34a, 34b, which will be described later.

  Further, stopper holes (not shown) are formed in the holding table 3 on both sides of the transfer table 4a, and stoppers 13a and 13b which can be moved up and down are arranged in these stopper holes. The elevating sources 14a and 14b of the stoppers 13a and 13b are both fixed to a stopper base 15 attached to the side surface of the base plate 2 and are configured to operate in conjunction with the operation of the sorting lever 20 described later.

  Furthermore, a unit mounting base 17 is disposed on the holding base 3 via a third spacer 16, and a drive unit 19 of the sorting unit 18 is attached to the lower surface of the unit mounting base 17. The drive unit 19 is configured to drive a sorting lever 20 that swivels below the index tables 7a and 7b. The sorting lever 20 reciprocates by a predetermined angle and the next nut 5 on the transfer table 4a is moved. It is configured to be alternately supplied to the index tables 7a and 7b. The drive unit 19 is configured to be driven after completion of the female screw inspection and completion of rotation of the index table 7b (or 7a) located at a position away from the tip of the sorting lever 20.

  Above the transfer table 4a, a female screw inspection CCD camera 22 is disposed via a first camera table 21 attached to the base plate 2. The nut 5 is irradiated with light from an oblique direction and reflected. The state is configured to be captured as image information. The image information captured by the female screw inspection CCD camera 22 is subjected to image processing to determine the presence or absence of a female screw, and the determination result is sequentially stored in a control device (not shown) for each nut. ing.

  On the other hand, the holding table 3 is provided with rotating table grooves 23a and 23b at the position of the inspection station. The rotating table grooves 23a and 23b are moved on the same plane as the holding table 3 as shown in FIG. The turntables 24a and 24b having mounting surfaces are rotatably arranged via the second bearings 36a and 36b. The turntables 24a and 24b are configured to receive the rotation of work rotation motors 25a and 25b fixed to the base plate 2 via the second couplings 35a and 35b, and the work rotation motors 25a and 25b. Are configured to rotate once after the corresponding index tables 7a and 7b rotate by a predetermined division angle. Further, the turntables 24a and 24b have slightly magnetized magnet plates 26a and 26b. When the turntables 24a and 24b rotate, the nuts 5 are attracted and fixed, and when the storage grooves 8a and 8b move, the nuts are moved. 5 can be detached from the turntables 24a and 24b.

  Light projecting devices 27a and 27b having ring-shaped light projecting portions 28a and 28b are disposed at front positions of the rotary tables 24a and 24b via a light projecting table (not shown) fixed to the base plate 2, respectively. The surface of the nut 5 placed on the turntables 24a and 24b is irradiated with light from the lateral direction. In addition, CCD cameras 29a and 29b are arranged at positions corresponding to the rotary tables 24a and 24b via a second camera table (not shown) fixed to the base plate 2, and the CCD cameras 29a and 29b. As shown in FIG. 4, the nut is positioned slightly eccentrically outside the linear position formed by the light projecting devices 27a, 27b and the rotary tables 24a, 24b, and is placed on the rotary tables 24a, 24b. The reflection state of the surface 5 is captured as image information. The CCD cameras 29a and 29b are adjusted so that a surface having a predetermined width located slightly outside the center of the nut 5 placed on the turntables 24a and 24b is used as an inspection area. However, there is much light irradiation from the lateral direction, and this is a region where the shadow of the wound becomes clear. Further, the CCD cameras 29a and 29b are configured to capture the reflection state in the inspection area as image information several tens of times, and to inspect the entire circumference of the nut 5 based on the information.

  The holding table 3 is provided with defective product exclusion grooves 30a and 30b at the position of the defective product elimination station. The defective product elimination grooves 30a and 30b have a bottom plate 31a having a plane on the same plane as the holding table 3. , 31b are arranged. The bottom plates 31a and 31b have thin plate-like auxiliary guides 32a and 32b having arc surfaces concentric with the index tables 7a and 7b, and form a guide path through which the nut 5 can move on the bottom plates 31a and 31b. The bottom plates 31a and 31b are configured to be rotated downward by a predetermined angle by bottom plate drive motors 33a and 33b attached to the base plate 2, and their drive shafts (not shown) are always held in a locked state. When the nut 5 supplied on the bottom plates 31a and 31b has defective product information, the bottom plate drive motors 33a and 33b are operated to open the bottom plates 31a and 31b at a high speed and then return to the original position. Has been. The holding table 3 is provided with non-defective product discharge grooves 34a and 34b at the position of the non-defective product discharge station, and a non-defective nut is provided below the non-defective product discharge grooves 34a and 34b via a non-defective chute (not shown). A non-defective storage box (not shown) for storing 5 is disposed.

  In the component scratch inspection apparatus, as shown in FIG. 5, the nuts 5 are aligned and supplied in a row on the chute part 4 with the collar part upward, and the most advanced nut 5 is placed on the transfer table 4 a of the chute part 4. It reaches the one stopper 13b and the sorting lever 20 and stops. At this time, light is applied to the female screw portion of the nut 5 from a light projecting unit (not shown) attached to the female screw inspection CCD camera 22 from the obliquely upper side, and the female screw inspection CCD camera 22 reflects the reflection state of the female screw portion. As image information. When the quality of the nut 5 is detected from the image information and a defect is detected, the defect product information is stored in the control device.

  When the determination of pass / fail of the internal thread portion is completed, the rotation of the predetermined split angle of the index table 7b (also in the case of the index table 7a) located at a position away from the tip of the sorting lever 20 is completed. The raising / lowering source 14b of the stopper 13b which locks the nut 5 operates, and the stopper 13b moves backward. At the same time, the drive unit 19 of the sorting unit 18 operates to rotate the sorting lever 20 by a predetermined angle, and the nut 5 is supplied to the storage groove 8b of the index table 7b. Thereafter, the raising / lowering source 14a of the other stopper 13a is operated to make the stopper 13a project, and the next nut 5 together with the sorting lever 20 is locked by the transfer table 4a. This operation is repeated, and the nuts 5 reaching the transfer table 4a are alternately supplied to the storage grooves 8a and 8b of the two index tables 7a and 7b. Thereby, the surface of the nut 5 can be inspected in two systems.

  On the other hand, when the inspection of the index table 7b at the inspection station is completed, the table drive motor 10b is operated, and the index table 7b rotates by a predetermined division angle and stops. Accordingly, the inspected nut is pushed out from the turntable 24b of the inspection station, and the nut 5 supplied to the adjacent storage groove 8b is supplied onto the turntable 24b. When this is detected by a detection sensor (not shown), the presence / absence of defective product information corresponding to the nut 5 is determined. At this time, if the defective product information is included in the nut 5, the defect inspection is not performed at the defective product removal station, but the removal completion is waited for at the defective product removal station. The table drive motor 10b is driven. By driving the table drive motor 10b, the index table 7b rotates by a predetermined division angle and stops, and prepares for the next supply of the nut 5.

  When the nut 5 supplied on the turntable 24b has no defective product information, light is emitted from the light projecting device 27b and the work rotation motor 25b is activated. Due to the rotation of the work rotation motor 25b, the turntable 24b rotates once, and the reflection state of the nut 5 is captured as image information by the CCD camera 29b. At this time, in the inspection area where image information can be obtained, since the amount of light from the lateral direction is large at a predetermined width at a position slightly decentered from the center of the nut 5, when the surface of the nut 5 is scratched, It appears clearly as a shadow. Moreover, since the light projecting portion 28b of the light projecting device 27b has a ring shape, when there is a dent, etc., light is irradiated from the entire circumference of the dent, and these are diffusely reflected and do not reach the CCD camera 29b. , The shadow of the wound becomes even clearer. When the image information is subjected to image processing to determine the presence or absence of a flaw and a flaw is detected on the surface of the nut 5, defective product information is stored for each nut in the control device.

  When the rotation of the index table 7b is completed, if the nut 5 guided in the storage groove 8b reaches the bottom plate 31b of the defective product removal station and stops, it is determined whether there is defective product information. When defective product information is not stored in the nut 5, the rotation of the index table 7b is awaited. On the other hand, when defective product information is stored in the nut 5, as shown in FIG. 6, the bottom plate drive motor 33b is operated, and the bottom plate 31b is rotated and inclined at a high speed. Therefore, the nut 5 on the bottom plate 31b falls by its own weight. Thereafter, the bottom plate 31 b returns to a predetermined position and is provided for the next nut 5.

  Further, when the rotation of the index table 7b is completed, when the nut 5 guided in the storage groove 8b reaches the non-defective product discharge groove 34b of the non-defective product discharge station, the nut 5 falls from the non-defective product discharge groove 34b onto the non-defective product chute. It is stored in.

In this embodiment, the turntables 24a and 24b are configured to rotate once, but the inspection areas may be overlapped by rotating the rotating tables 24a and 24b one or more times. In addition, the internal thread inspection is performed on the chute unit 4, but a separate rotating table (not shown) is provided at an empty station in the index tables 7a and 7b, and a CCD camera provided with a light projecting device is inclined. The reflection state of the internal thread portion during the rotation of the turntable may be taken in as image information. In this case, it can be determined whether or not the entire circumference of the female screw portion of the nut is damaged.

1 Component Scratch Detection Device 1a First Spacer
2 Base plate
2a 2nd spacer 3 Holding stand 4 Chute part 4a Transfer stand
5 Nut with hook
6a, 6b first bearing
7a, 7b Index table
8a. 8b Storage groove
9a, 9b First coupling 10a, 10b Table drive motor
11a, 11b 1st guide plate 12a, 12b 2nd guide plate 13a, 13b Stopper 14a, 14b Elevation source 15 Stopper base 16 Third spacer 17 Unit mounting base 18 Distribution unit 19 Drive unit 20 Distribution lever 21 First camera base 22 Screw inspection CCD cameras 23a, 23b Rotary table grooves 24a, 24b Rotary tables 25a, 25b Work rotation motors 26a, 26b Magnetic plates 27a, 27b Projecting devices 28a, 28b Projecting units 29a, 29b CCD cameras 30a, 30b Eliminate defective products Grooves 31a and 31b Bottom plates 32a and 32b Auxiliary guides 33a and 33b Bottom plate drive motors 34a and 34b Non-defective product discharge grooves 35a and 35b Second couplings 36a and 36b Second bearings

Claims (4)

A light projection device for irradiating light to a part to be inspected arranged at a predetermined position is arranged, a CCD camera is arranged at a position for receiving reflected light of the part to be inspected, and a CCD camera using the reflection state of the part to be inspected as image information A component scratch inspection apparatus configured to determine the presence or absence of scratches on the surface of the component to be inspected from this image information,
A turntable for placing and rotating a part to be inspected is provided, a holding stand having the same surface as the turntable, and an index table rotating along the holding stand are arranged, and a predetermined amount is provided on the outer periphery of the index table. A storage groove is provided for each division angle, and the storage groove is stopped on the turntable, and the reflection state of the component to be inspected is taken in at a predetermined rotation angle by the CCD camera while the turntable rotates. Parts scratch inspection device characterized by. 2. A component flaw inspection apparatus according to claim 1, wherein a chute portion for guiding the component to be inspected is disposed in the storage groove of the index table . 3. The component flaw inspection apparatus according to claim 1 , wherein the index table is arranged on both sides of the chute and is configured to distribute the component to be inspected by a distribution lever arranged near the tip of the chute . The holding table has a defective product rejection groove, and a bottom plate located on the same plane as the holding table is arranged in the defective product rejection groove, and the bottom plate is configured to rotate downward from the holding table. The component flaw inspection apparatus according to any one of claims 1 to 3 .

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