JP2001074424A - Display for searching and developing inner surface of pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To search the state on the inner surface of a pipe or a cylinder without touching and to display that state while developing and reproducing planarly by transmitting light received at a forward end light receiving part to a photoelectric conversion display section through a rear end light transmitting section and converting variation of light photoelectrically. SOLUTION: The display comprises a forward end light receiving part 7 annularly arranged with a light source and a large number of optical fiber 6, and a light regulator 5. Immediately before the display moves through a pipe 1 to be searched, the light from the light source and the light regulator 5 reflected on the inner surface of a pipe 1 is received at the forward end light receiving part 7 in order to search the state on the inner surface as the variation of light. The display 3 comprises a rear end light transmitting section 8 arranged with optical fibers 6 in rows, and a photoelectric conversion display section 9 connected therewith through a cable 12. The rear end light transmitting section 8 receives the light, received at annularly arranged forward ends 6a, through the optical fibers 6 and delivers an amplified light signal to the photoelectric conversion display section 9 through the cable 12. The photoelectric conversion display section 9 converts the received signal and displays a visible image on a Braun tube.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for exploring an inner surface state of a pipe, a cylinder or the like in a non-contact manner, and developing and displaying the state in a substantially planar manner or for exploring and displaying an inner surface of a pipe. Related to the device.

[0002]

2. Description of the Related Art Conventionally, when investigating the state of the inner surface of a circular tube, for example, the presence or absence of cracks or the like in the inner surface, a person looks directly into the inside with his own eyes or an endoscope. And put it indirectly with this. Also, when investigating the state of the inner surface of the casting cylinder, such as roughness, the stylus is reciprocated along the generatrix and repeated in the circumferential direction so that the state of the entire inner surface can be investigated and grasped. I was

[0003]

However, these conventional devices have the following problems. That is, in the former case, since the inner surface of the tube is a curved surface, a flaw or the like appears to be bent, and it is extremely difficult to grasp the state, and there is a problem that a measure cannot be taken. In the latter case, the movement of the stylus causes damage such as scratching the inner surface, and even if corrective measures can be taken, there is a problem that another measure for repairing the scratches and the like is required. Was.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems by exploring the inner surface state of a pipe, a cylinder, and the like in a non-contact manner, and developing and reproducing the state in a plane.

[0005]

The present invention has the following configuration to solve the above problems. That is, claim 1 includes a light source, a tip light receiving portion having a ring-shaped arrangement of a large number of optical fibers, and a light adjusting body, and when moving in the searched tube, the inner surface of the searched tube immediately before the movement. An exploration device that receives reflected light from the light source and the light adjusting body at the front end light receiving unit, captures the state of the inner surface as a change in light and performs exploration, and a rear end light transmitting unit of the optical fibers arranged in a row. And a photoelectric conversion display unit, and transmits light received by the front end light receiving unit to the photoelectric conversion display unit via the rear end light transmitting unit, and changes the light in the photoelectric conversion display unit to photoelectric conversion. A display device for displaying an image developed as an original is provided.

According to a second aspect of the present invention, in the first aspect, the exploration apparatus has a light source in the center of the light receiving portion at the front end, and a light adjuster as a conical reflector in front of the light source. Things.

According to a third aspect of the present invention, in the first aspect, the exploration apparatus has a light adjuster as a disk-shaped shield in front of the light receiving portion at the tip, and has a light source in the opposite direction in front of the light adjuster. It is characterized by the following.

The present invention operates as follows by the above configuration. That is, for example, at a damaged portion of the inner surface of the tube, the light emitted from the light source and adjusted by the light adjusting body is irregularly reflected (or absorbed), and a portion corresponding to the portion of the annular light receiving portion at the front end is arranged. Light reception at the tip light receiving unit is weak. Therefore, the search state is sent to the photoelectric conversion display unit via the rear end light transmitting unit in a row arrangement, which is the rear end of the same optical fiber, where the circumferential portion is, for example, a row (longitudinal) difference in shading. Appears as.
Thus, by moving the exploration device little by little in the longitudinal direction (horizontally), each time the movement is performed, the corresponding portion is represented by the difference in shading, and eventually the state of the inner surface of the pipe is developed in a vertical and horizontal plane. Is displayed as an image.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. In FIG. 1, reference numeral 1 denotes a circular tube serving as a probe having a diameter of 30 mmφ, which is not shown, but whose outer side is held by a holder that slides on a table.
2 is an exploration device, and 3 is a display device.

The exploration apparatus 2 has a light source 4 at the center and a plurality of (240) optical fibers (thickness of the order of microns) 6 around the light source 4.
3... In order to arrange n (240) pieces, there is a tip light receiving portion 7 inserted between outer and inner stainless steel tubes 7a having an outer diameter of 20 mmφ. In addition, the exploration apparatus 2 supports the conical reflector 5 with a wire 11 supported in front of the light source 4. The light source 4 is connected to a power source (not shown) via an electric wire 10.

The display device 3 has a rear end light transmitting section 8 having a phototransistor built-in, in which 123... N n rear ends 6 b of optical fibers 6 bundled at an appropriate length are arranged in a column. And a photoelectric conversion display unit 9 connected by a cable 12. The rear end light transmitting unit 8 receives the light received by the annularly arranged front end 6 a through the optical fiber 6 and sends the light to the photoelectric conversion display unit 9 through the cable 12 in a line and as an amplified light signal. The photoelectric conversion display unit 9 displays the received light (signal) on a CRT as an image that can be seen by the human eye under a medium conversion such as electricity, that is, a thresholded light and dark image of 0 to 256 gradations. . Or, they are printed on paper.

In FIG. 2 showing a state in which the exploration apparatus 2 is inserted into the circular tube 1, the light of the light source 4 strikes the reflector 5 and is reflected. The light is reflected by the inner surface immediately before the portion 7 and enters the front end 6a of the light receiving portion 7 corresponding to the vicinity of the inner surface. If the part is part of a long wound, part of it will be irregularly reflected or absorbed,
The amount of light received at the tip 6a in the vicinity is reduced. Since the amount of reflected light is large in a portion having no flaw, the amount of light received at the other end is large. Thus, the state at the circumferential portion of the inner surface is transmitted to the rear end light transmitting section 8 through the optical fiber 6, and further transmitted to the photoelectric conversion display section 9, where the state is in a row (vertical) state. Is displayed on the screen.

It is important that the light receiving portion 7 receives only the reflected light from the inner surface of the circular tube immediately before the light receiving portion. Therefore, the optical axis (distribution) of the light emitted from the light source 4 is important. light)
And the position of the reflector 5 poses a problem. The former preferred example will be described later. For the latter, the reflector 5
The position of the rear surface 5a is 10 to 20 from the tip of the tip light receiving unit 7.
It was found that the distance (B) of mm was good. In this way, strong reflected light is obtained at the portion C (5 mm width) of the inner surface of the tube immediately before the movement of the tip light receiving unit 7.

When the circular tube 1 is moved little by little in the direction of the arrow X or the exploration device 2 little by little in the direction of the arrow X 'from the inserted state, the state of the inner surface of the tube is thresholded each time, and the display device 3 The image is displayed as an image developed on a plane of X (horizontal direction) and Y (vertical direction).

Next, two examples of the distribution of the optical axis (light distribution) of the light emitted from the light source will be described.

FIG. 3 shows a light distribution (optical axis) of light emitted from the light source 4 distributed by a lens. That is, the stainless steel tube 7a
Inside, a lens 13 is disposed in front of the light source 4 by peripheral bonding, and the inside of the tube 7a is coated so as not to cause irregular reflection.

In this manner, the light emitted from the light source 4 is reflected on the inner surface of the tube or directly enters the lens 13 and emerges therefrom as a converged (strong) parallel light beam 14.
It becomes ring-shaped light 14 '.

FIG. 4 shows an arrangement in which the light source 4 is arranged in the opposite direction and a concave mirror 15 is arranged in the tube 7a so as to receive the light. As in FIG. Light 14 'can be obtained.

Next, another example of a method of supporting the reflection plate 5 is shown in FIG.
This will be described below. In FIG. 5, the light source 4 and the lens 13
Is the same as that shown in FIG. 3, in which the center of the reflector 13 is adhered and supported to the lens 13 by a thicker pillar 16.
In this way, it is possible to prevent the shadow of the supporting wire 11 from being reflected, as compared with the case where the outsides of FIG.

The reflector 5 has a vertex angle of 90 ° of a cone.
When a metal material is cut out so as to obtain a film and a film is stretched on the surface of the metal material, both strength and mirror finish are achieved.

Next, an example in which the light adjusting member is not a reflection plate will be described.

FIG. 6 shows that the light source 4 which is a diffusion type and high brightness light is protruded from the front surface of the tip light receiving section 7 and the tip 6a of the optical fiber 6 is bent at an obtuse angle to form a stainless steel tube 7a at that portion. In this embodiment, a light beam is reflected as an incident light beam 17 by reflection only on the inner surface C of the circular tube 1.

In this case, the distal end 6a of the optical fiber 6 and the hole of the tube 7a serve as a light adjusting body for adjusting the light emitted from the light source 4.

FIG. 7 shows a shielding plate 18 in front of the light receiving section 7.
Further, a light source 4 in the opposite direction is further disposed in front of the light source 4, and these are connected and supported by a wire 19. The electric wire 10 of the light source 4 extends along the wire 19 to the tip light receiving unit 7 side. In this case, the light of the light source 4 is adjusted by the shielding plate 18 and the tip 6a receives the reflected light 20 of only the immediately preceding portion C on the inner surface of the circular tube 1.

Next, the results of experiments using the embodiment of FIG. 1 will be described with reference to FIGS. In the figure, the arrow X 'indicates the traveling direction of the search device 2 (it can be said that the passage of time).
Is shown. However, in the experiment, the circular tube 1 was advanced in the X direction, that is, toward the exploration device 2 while holding the outside.

FIG. 8 shows an original drawing in which two vertical wavy patterns 22 and 23 are drawn in black on flat white paper 21. The paper 21 was rolled in the direction A and stuck to the inner surface of the circular tube 1, and the paper 21 was searched by the apparatus shown in FIG. FIG. 9 is a reproduction view in which the image is developed and drawn on a plane and reproduced. In FIG. 9, it can be seen that the wavy pattern is reproduced wonderfully, ie exactly the same. In FIG. 9, reference numeral 24 denotes a shadow of the wire 11.

FIG. 10 is an original drawing showing a striped pattern line and oblique lines, and FIG. 11 is a reproduction view thereof.

FIG. 12 is a photograph of an experimental tool showing a state in which the paper 21 is rolled and stuck on the circular tube 1, and it can be seen that a stripe pattern is shown in a curved state on the inner surface of the central circular tube. .

According to the embodiment of the present invention, this state is displayed and displayed in an expanded state.

The tubes or cylinders to be probed according to the present invention may be tubes having various cross sections such as ellipses and polygons in addition to the circular cross sections described above. In that case, the exploration device is shaped according to the cross-sectional shape. In addition, for analysis of the obtained image, by digitizing and using a computer,
There are many possible uses, such as knowing the area of a closed image. The image is not only black and white, but also CC
A color image using a combination of three primary colors of RGB and 256 gradations using a D camera can also be obtained.

[0031]

According to the present invention, the inner surfaces of the tube and the cylinder can be searched in a non-contact state, and the state can be displayed as a developed image. As a result, there is obtained an effect that no damage such as a damage is given to the inner surface of the tube, and no difficulty is caused in grasping the state of the inner surface of the tube.

[Brief description of the drawings]

FIG. 1 is a perspective view of an entire apparatus according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a probe inserted into a pipe.

FIG. 3 is a diagram showing an example of light distribution of light sources.

FIG. 4 is a diagram showing another example similar to FIG. 3;

FIG. 5 is a diagram obtained by adding an example of a reflector support to FIG.

FIG. 6 is a sectional view showing another embodiment of the search device.

FIG. 7 is a sectional view showing still another embodiment of the search device.

FIG. 8 is an original view before pasting in a circular pipe.

FIG. 9 is a drawing diagram in which the inside of the circular pipe to which the one in FIG. 8 is attached is searched, developed, and reproduced on a display device.

FIG. 10 is another original view similar to FIG.

FIG. 11 is a reproduction drawing of FIG. 10 similarly to FIG. 9;

12 is a photograph for showing a state where the original drawing of FIG. 10 is attached to the inside of the circular pipe, and is a photograph of the circular pipe and the like held by the holder for table-top movement.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Circular tube (tube to be searched) 2 Exploration device 3 Display device 4 Light source 5 Reflector (light adjuster) 6 Optical fiber 7 Front light receiving unit 8 Rear light transmitting unit 9 Photoelectric conversion display unit 10 Electric wire 11 Support wire 12 Cable 13 Lens 14 Parallel light 15 Concave mirror 16 Support 17 Incident light 18 Shielding plate 19 Wire 20 Reflected light 21 Paper 22 Wavy pattern 23 Wavy pattern 24 Shadow

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2F065 AA49 AA54 BB08 FF04 HH02 HH03 JJ24 LL03 LL04 LL19 LL30 QQ03 SS13

Claims (3)

[Claims] 1. A light source comprising: a light source; a tip light receiving portion having a ring-shaped arrangement of a large number of optical fibers; and a light adjusting body, wherein the light source is located on the inner surface of the search tube immediately before the movement when moving within the search tube. An exploration device that receives the reflected light by the light adjusting body and the light receiving unit at the front end light receiving unit, captures and detects the state of the inner surface as a change in light, and a rear end light transmitting unit of the array of the optical fibers, A photoelectric conversion display unit, and transmits light received by the front end light receiving unit to the photoelectric conversion display unit via the rear end light transmitting unit, and changes the light in the photoelectric conversion display unit based on photoelectric conversion. A display device for exploring and developing the inner surface of a pipe, comprising a display device for displaying an image developed on a tube. 2. The tube inner surface according to claim 1, wherein the exploration device has a light source in the center of the tip light receiving unit, and a light adjuster as a conical reflector in front of the light source. Exploration deployment display device. 3. The exploration apparatus according to claim 1, further comprising: a light adjuster serving as a disc-shaped shield in front of the tip light receiving unit, and an opposite light source in front of the light adjuster. Exploration and display device for pipe inner surface.