JPH0465609A - In-tube surface inspection instrument - Google Patents

Abstract

PURPOSE:To stabilize the image pickup state of a television camera and to obtain a sharp image by supporting the tip and base end of a main body frame on guide rollers and holding the main body frame and the internal surface of a tube to be inspected at a constant distance. CONSTITUTION:The main body frame 3 inserted into the tube 1 to be inspected is supported at its front and rear sides on the tip guide roller 11 and base end guide roller 7 provided to a tip support part 8 and a base end support part 4, so the main body frame 3 is inserted into the tube 1 to be inspected without swinging, so that the main body frame 3 and the internal surface of the tube 1 to be inspected are held at the constant distance. Then an inspected area of the internal surface of the tube 1 to be inspected which is lighted by a light 15 is picked up by television cameras 12 through both endoscopes 13. At this time, the distance between the main body frame 3 and the internal surface of the tube 1 to be inspected is held constant, so the image pickup state of the television camera 12 is stabilized and the sharp image is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a tube inner surface inspection device for inspecting the inner surface of a tube with a comparatively small diameter.

BACKGROUND ART Conventionally, to inspect the inner surface of a tube, a rod was inserted into the tube to be inspected, and a camera serving as a sensor provided at the tip of the rod was used to image the inner surface of the tube to be inspected.

Problems to be Solved by the Invention However, in the conventional configuration described above, if the diameter of the pipe to be inspected is relatively small, the diameter of the rod cannot be increased, and the tip of the rod cannot be increased due to lack of strength. This caused the problem that the TV camera's shooting conditions became unstable due to fluctuations in the image quality, making it impossible to obtain clear images.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a tube inner surface inspection device that can stably image the inner surface of a small-diameter tube to be inspected.

Means for Solving the Problems In order to solve the above problems, the present invention includes a main body frame connected to the distal end of a rod inserted into a pipe to be inspected, and a cover provided at the distal and proximal ends of the main body frame. A guide roller that comes into contact with the inner surface of the tube to be inspected and moves, a light source provided on the main body frame to illuminate the inner surface of the tube to be inspected, and a light source arranged on the main body frame along the axial direction of the tube to be inspected,
The proximal end is connected to a television camera installed on the main body frame, and the distal end is equipped with an endoscope that can photograph the inspection area on the inner surface of the tube to be inspected illuminated by a light source. be.

Effect With the above-mentioned configuration, the main body frame inserted into the pipe to be inspected is supported at its distal and proximal ends by the guide rollers that move in contact with the inner surface of the pipe to be inspected, so that the main frame can be inserted into the pipe to be inspected without shaking. inserted into the target canal,
The distance between the main body frame and the inner surface of the pipe to be inspected is kept constant.

Then, the inspection area on the inner surface of the tube to be inspected illuminated by the light source is imaged by a television camera through an endoscope. At this time, as described above, since the distance between the main body frame and the inner surface of the tube to be inspected is kept constant, the imaging state of the television camera is stable and a clear image can be obtained.

In addition, instead of directly imaging the inner surface of the tube to be inspected with a TV camera, the image is taken through an endoscope, so the TV camera can be placed in any position without being restricted by its own structure. This makes it possible to minimize the spread of the equipment in the radial direction of the pipe to be inspected, making it possible to cope with pipes to be inspected that have a smaller diameter than before.

EXAMPLE An example of the present invention will be described below based on the drawings. 1st
In the figure, a main body frame 3 is connected to the distal end of a rod 2 inserted into a tube to be inspected 1 via a proximal end support part 4, and the proximal end support part 4 is connected to the main body frame 3 through a bearing 5. a proximal outer frame 6 that is fitted externally to the rod body 2 and internally fitted to the rod body 2; and a proximal guide roller 7 that is rotatably supported by the proximal outer frame 6 and that moves while coming into contact with the inner surface of the tube to be inspected 1. It has Further, a tip support portion 8 is provided at the tip of the main body frame 3, and the tip support portion 8 is rotatably attached to the tip outer frame lO which is externally fitted onto the main body frame 3 via a bearing 9, and to the tip outer frame 10. It has a distal end guide roller 11 which is pivotally supported and rolls in contact with the inner surface of the tube 1 to be inspected. Furthermore, a pair of television cameras 12 are disposed inside the main body frame 3 facing each other on the distal end side and the proximal end side, and the television camera I2 is equipped with a CC
It is formed by a D camera. And each TV camera 1
2 is connected to an endoscope 13, which is disposed along the tube axis direction of the tube to be inspected 1, and is configured to image the inner surface of the tube to be inspected 1 at the distal end side. is formed. Further, both endoscopes 13 are arranged so that their respective imaging areas A are continuous. Furthermore, a light 14 is provided on the main body frame 3 as a light source for illuminating the inspection target area on the inner surface of the tube 1 to be inspected.

The effects of the above configuration will be explained below.

The main body frame 3 inserted into the tube to be inspected 1 is moved by the distal guide rollers 1 provided on the distal end support section 8 and the proximal end support section 4.
Since the front and rear sides are supported by the base end guide rollers 7, the main frame 3 is inserted into the tube to be inspected 1 without wobbling, and the distance between the main frame 3 and the inner surface of the tube to be inspected 1 is constant. is maintained.

Then, the inspection area on the inner surface of the tube to be inspected 1 illuminated by the light 15 is imaged by each television camera 12 through both endoscopes 13. At this time, as described above, the i? Since 1 ft is kept constant, the imaging state of the television camera 12 is stable and a clear image can be obtained.

Further, since the imaging area A of the endoscope 13 is continuous, the imaging area of the entire device is expanded, and the inspection target area can be imaged in a short time. In addition, TV camera 1
2, the inner surface of the tube to be inspected 1 is not directly imaged, but is imaged through the endoscope 13, so the television camera 12 can be placed in any position without being restricted by its own structure. This makes it possible to minimize the spread of the equipment in the radial direction of the pipe 1 to be inspected, thereby making it possible to cope with the pipe 1 to be inspected having a smaller diameter than before.

Effects of the Invention As described above, according to the present invention, by supporting the distal and proximal ends of the main body frame with guide rollers, the distance between the main body frame and the inner surface of the tube to be inspected can be kept constant. It is possible to obtain clear images by stabilizing the imaging state of the television camera.

In addition, the TV camera does not directly image the inner surface of the tube to be inspected, but instead uses an endoscope to capture the image, so the TV camera can be placed in any position without being restricted by its own structure. This makes it possible to minimize the spread of the equipment in the radial direction of the pipe to be inspected, making it possible to handle pipes to be inspected that are smaller in diameter than conventional pipes.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of a tube inner surface inspection apparatus showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Tube to be inspected, 2... Rod, 3... Main body frame, 7... Proximal guide roller, 11... Distal guide roller, 13... Endoscope, 14...・Wright, A.
...Imaging area.

Claims (1)

[Claims] 1. A main body frame connected to the tip of a rod inserted into the pipe to be inspected, and guide rollers provided at the tip and base end of the main frame and rolling in contact with the inner surface of the pipe to be inspected; A light source provided on the main body frame to illuminate the inner surface of the tube to be inspected, and a light source body arranged on the main body frame along the axial direction of the tube to be inspected, and the proximal end side is connected to a television camera provided on the main body frame. A tube inner surface inspection device characterized by comprising: an endoscope whose distal end side is capable of photographing an inspection area of the inner surface of a tube to be inspected illuminated by a light source.