JP2007199164A - In-cylinder inspection tool and in-cylinder inspection apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an in-cylinder inspection tool and an in-cylinder inspection apparatus having comparatively simple structure, so that the cost is not incurred, and easy-handling, capable of easily and accurately conducting the in-cylinder inspection. <P>SOLUTION: The apparatus includes a columnar probe 24, having a conical-shaped conical mirror 22 at the tip thereof; a pair of positioning guide parts 30 arranged along the probe 24; and a driving apparatus 26 for driving the positioning guide parts 30, in parallel with each other by taking the probe 24 as the center so that they may move by equal distance in the opposite directions. An illumination 44 that illuminate an inspection object having a through hole 16 is provided, and a camera 46 for photographing the inspection object is provided, the through hole 16 of the inspection object is irradiated with a light of the illumination 44, and also, the conical mirror 22 is inserted to the through hole 16 of the inspection object, from the side opposite to the illumination 44 across the inspection object to photograph the inside surface of the through hole 16 of the inspection object, that is, the inside surface reflected in the conical mirror 22. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an in-cylinder inspection jig and an in-cylinder inspection device that are inserted into a cylindrical through-hole or tube provided in a processed part, a molded product, or the like, photograph an inner surface state, and inspect the inner surface.

  Conventionally, internal inspection of cylindrical through-holes and pipes formed in processed products is generally performed by visually inspecting scratches and dirt, or illuminating from the tip of an optical fiber or the like provided around the cylindrical scope. There is known an inspection apparatus that irradiates light, images the inner surface of a hole with a fish-eye lens or the like provided at the distal end of the scope, and guides the image of the inner surface to the camera through an optical system in the scope.

Also, as disclosed in Patent Document 1, an inspection apparatus that illuminates the inside of a cylinder with illumination, inserts a cylindrical lens whose end is formed into a cone into the cylinder, and photographs the inside of the cylinder is also proposed. Yes.
JP 2001-281556 A

  Among the conventional techniques described above, the visual inspection may cause fine scratches and oversight of dust and is not efficient. In addition, inspection jigs such as a cylindrical scope have a complicated structure such as an optical system and are expensive.

  The inspection apparatus disclosed in Patent Document 1 also uses an optical component having an optical system of image light and illumination light coaxially when photographing the inner surface state of the cylindrical hole, which is costly and complicated in structure. It was something. Further, positioning in the cylinder is difficult at the time of photographing, and accurate positioning cannot be performed, and image distortion cannot be sufficiently corrected. Therefore, the accuracy of inspection by image processing is not sufficient.

  The present invention has been made in view of the above-described problems of the prior art, and has an in-cylinder inspection jig and an in-cylinder that are relatively simple in structure, inexpensive, easy to handle, and capable of easily performing an accurate inspection. An object is to provide an inspection device.

  According to the present invention, a columnar probe having a conical mirror formed at a tip thereof, a pair of positioning guide portions provided along the probe, and the positioning guide portions around the probe are parallel to each other. And an in-cylinder inspection jig provided with a drive device that moves the same distance in the opposite direction.

  The present invention also provides a columnar probe having a conical mirror formed at the tip thereof, a pair of positioning guide portions provided along the probe, and the positioning guide portion centered on the probe. An in-cylinder inspection jig comprising a drive device that moves in the opposite direction in parallel is provided, and includes an illumination that illuminates the inspection object having a through-hole and a camera that images the inspection object, and the illumination is the inspection object The inside of the through hole of the inspection object reflected on the conical mirror surface by irradiating the inside of the inspection hole and inserting the conical mirror into the through hole of the inspection object from the side opposite to the illumination across the inspection object This is an in-cylinder inspection device that takes pictures.

  According to the in-cylinder inspection jig and the in-cylinder inspection apparatus of the present invention, the conical mirror of the in-cylinder inspection jig can be inserted into the through-hole to be inspected with a simple configuration, and can be accurately positioned and handled. It is easy and an accurate image in the cylinder can be obtained. As a result, the accuracy of inspection by image processing can be improved, and inspection with high accuracy can be performed efficiently.

  Hereinafter, an embodiment of an in-cylinder inspection jig and an in-cylinder inspection apparatus according to the present invention will be described with reference to FIGS. The in-cylinder inspection jig 10 and the in-cylinder inspection device 12 of this embodiment are used for inspecting dust and scratches on the inner surface 18 of the cylindrical through hole 16 provided in the processed product 14 such as a piston. As shown in FIG. 1, the in-cylinder inspection jig 10 includes a metal columnar probe 24 that can be inserted into a cylindrical through hole 16 provided in the processed product 14. The probe 24 is provided with an elongated columnar insertion portion 20 and a conical mirror 22 formed concentrically and having a mirror-like surface at the tip of the insertion portion 20 so as to be integrated with each other. The probe 24 is attached to a main body portion 27 in which a proximal end portion of the insertion portion 20 accommodates a driving device 26 described later.

  On both sides of the probe 24, a pair of positioning guide pieces 28 made of metal are provided in parallel along the longitudinal direction. Each of the positioning guide pieces 28 includes a guide portion 30 having a semicircular cross section that can contain the probe 24. Further, the base portions of the positioning guide pieces 28 are respectively attached to the linear sliders 32 of the driving device 26 and fixed by screws (not shown) or the like. The linear slider 32 is fitted along the linear rail 34 so as to be slidable in the parallel direction.

  One end of a pair of substantially L-shaped connecting arms 36 constituting the driving device 26 is connected to the bottom of each linear slider 32. One end of a connecting arm 36 connected to each linear slider 32 is positioned so as to be swingable in a moving through hole formed in the linear rail 34. The connecting arm 36 is accommodated in a main body 27 formed in a rectangular parallelepiped, and is provided so as to be rotatable about a corner shaft 36a. The other end of each connecting arm 36 is connected to a movable portion of an air cylinder 38 that constitutes the driving device 26. In conjunction with the forward / backward movement of the air cylinder 38, the distal ends of both connecting arms 36 are formed so as to be able to open and close at the same distance in opposite directions at the same time. Further, a pair of connecting pipes 40 formed so that an air hose or the like can be connected is provided on the side surface of the driving device 26 so that pressurized air can be introduced and extracted.

  Next, a method of using the in-cylinder inspection device 12 of this embodiment will be described. Here, for example, as shown in FIG. 2, the cylindrical through-hole 16 penetrating the side surface of the piston pin which is the molded product 14 is inspected. The inspection is performed on the fitting groove 42 of the snap ring that is formed concentrically on the inner surface 18 near both ends of the through hole 16 and is attached to prevent the piston pin from coming off.

  First, as shown in FIG. 2, the insertion portion 20 of the in-cylinder inspection jig 10 is inserted into the through hole 16 provided in the piston. At this time, the fitting groove 42 formed at the end of the through-hole 16 is inserted to a position where it is photographed near the center of the reflective surface of the conical mirror 22. Subsequently, the connecting arm 36 is swung by the air cylinder 38 until the outer surface of each guide portion 30 comes into contact with the inner surface 18 of the through hole 16 to open each positioning guide piece 28. As a result, the probe 24 is centered and positioned in the through hole 16, the center of the probe 24 coincides with the center of the through hole 16, and the apex of the conical mirror 22 is also located on the center of the through hole 16. .

  Then, illumination light is radiated to the through-hole 16 from the facing position of the conical mirror 22 by the ring illumination 44 supported by a tool (not shown). At the same time, a camera 46 supported by an instrument (not shown) is positioned in the opening at the center of the ring illumination 44. The camera 46 is inserted so that the center of the opening of the ring illumination 44, the center of the lens of the camera 46, and the center of the conical mirror are coaxial.

  In this state, the inner surface 18 of the through hole 16 having the fitting groove 42 is photographed through the conical mirror 22. The photographed image is taken into an apparatus (not shown) and subjected to image processing, and dust and scratches are inspected. In the image processing, the presence or absence of dust or scratches is determined by comparison with a regular image. For example, in the image taken at this time, as shown in FIG. 3, the inner surface 18 of the through-hole 16 is projected on the central conical mirror 22, and the fitting groove 42 is located just in the middle of the reflecting surface of the conical mirror 22. It is projected concentrically. When there is dust 48 in the fitting groove 42, the image is displayed.

  According to the in-cylinder inspection jig 10 and the in-cylinder inspection apparatus 12 of this embodiment, the cost is low and the handling is easy with a relatively simple configuration. In addition, since the cylindrical through hole 16 is easily centered by the positioning guide piece 28, the image of the inner surface 18 of the through hole 16 reflected by the conical mirror 22 is less distorted and is accurately concentric. An image can be obtained, the state of the inner surface 18 can be accurately grasped, and can be easily and accurately inspected by image processing.

  The in-cylinder inspection jig and the in-cylinder inspection apparatus according to the present invention are not limited to the above-described embodiment, and the in-cylinder inspection jig only needs to be formed to be centerable by the positioning guide piece. The thickness of the insertion part and the guide part can be appropriately set according to the size of the through hole. The ring illumination and the camera can be appropriately selected according to the inspection object to be photographed. Furthermore, the shape and material of each member can be appropriately changed.

It is a top view which shows the in-cylinder inspection jig of one Embodiment of this invention. It is a partially broken side view which shows the in-cylinder inspection apparatus of this embodiment. It is the schematic which shows the image of the conical mirror and through-hole inner surface of the cylinder inspection jig | tool of this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 In-cylinder inspection jig | tool 12 In-cylinder inspection apparatus 14 Work piece 16 Through-hole 18 Inner surface 20 Insertion part 22 Conical mirror 24 Probe 26 Drive apparatus 28 Positioning guide piece 30 Guide part 32 Linear slider 34 Linear rail 36 Connecting arm 38 Air cylinder 44 Ring lighting 46 camera

Claims (2)

  A columnar probe having a conical mirror formed at the tip, a pair of positioning guide portions provided along the probe, and the positioning guide portions in parallel and opposite directions around the probe An in-cylinder inspection jig comprising a drive device for moving the same distance. A columnar probe having a conical mirror formed at the tip, a pair of positioning guide portions provided along the probe, and the positioning guide portions in parallel and opposite directions around the probe An in-cylinder inspection jig comprising a drive device that moves the same distance is provided, and an illumination for illuminating the inspection object having a through hole and a camera for photographing the inspection object are provided, and the illumination is irradiated into the through hole of the inspection object And inserting the conical mirror into the through hole of the inspection object from the side opposite to the illumination across the inspection object, and photographing the inner surface of the through hole of the inspection object reflected on the conical mirror surface In-cylinder inspection device.

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