JPS5979146A - Guide for device examining inside face of tube - Google Patents

Abstract

PURPOSE:To examine easily and surely the inside face of even a curved tube, by connecting a front end guide plate provided with a guide roll and succeeding guide plates with links or the like. CONSTITUTION:A front end guide plate 3 where a freely turning roll 4 is projected in the front end part and guide plates 7- connected successively through links 8 and linear grooves 11 constitute a guide device of an endoscope for examination of the inside face. Lines connecting revolving supporting shafts 6 of the guide plate 3 and guide plates 7- and the roll 4 are inclined in the direction of action of the driving force, and more turning of guide plates 7 than required is limited by stoppers brought into contact with links 8, and the guide plate 3 is moved through the roll 4 while having a slope 3a slid along the inside face of a tube 1. By this constitution, the inside face of even a curved tube is examined easily and surely.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a guide for guiding a pipe inner surface inspection device. This invention relates to a guide for a pipe inner surface inspection device that can reliably guide the inside of a curved pipe bent at a right angle or an acute angle.

[Technical background and problems of the invention]

The tube inner surface appearance inspection device inserts a microscope into the inside of the tube to be inspected to inspect the inside of the tube for rot 1iIi+ and scratches, or to inspect for foreign matter clogged inside the tube. However, as shown in Fig. 1, the conventional pipe inner surface inspection apparatus from the outside does not allow the inspection of bent pipes that are bent at right angles or acute angles. Inspection of such curved pipes was impossible because the tube cannot be bent.0 Pipe inner surface appearance inspection using flexible optical fibers to connect the viewing instrument to the main body of the inspection device located outside the pipe. The device is
For gently curved pipes, the viewing instrument can be guided by the pipe's curved surface itself, allowing it to bend naturally to the pipe's curved surface, so inspection of gently curved pipes can be performed using the OJ function. However, in the case of bent pipes that are bent at right angles or acute angles, the bent portion cannot be bent, making inspection impossible.

So far, we have described the problems with the pipe inner surface visual inspection equipment that directly observes the pipe inner surface, but these problems can also be solved by ultrasonic flaw detection 11j: eddy current flaw detection equipment or radiation flaw detection equipment that detects the inner surface of the pipe. The same thing occurs when a sensor, ultrasonic wave source, eddy current source, or radiation ilC,I is inserted into a curved pipe.

[Purpose of emitting ψ]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a guide for a pipe inner surface inspection apparatus that can reliably guide an inspection surface even to a curved pipe bent at a right angle or near an acute angle.

[Summary of the invention]

In order to achieve this object, the present invention includes a distal guide plate, a drive unit that rotatably supports the rear end of the distal guide plate by a support shaft and drives the distal guide plate, and a drive unit that rotates the distal guide plate. and a roller rotatably supported at the distal end of the distal guide plate, at least a portion of which protrudes from the distal end of the distal guide plate. At the same time,
The roller has a straight line connecting the support shaft and the roller.
The present invention is characterized in that the direction of action of the driving force from the driving portion to the tip guide plate is (11,ri It).

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the guide for a pipe inner surface inspection apparatus according to the present invention will be described below with reference to the drawings.

In FIG. 2, the tip guide plate 3 supports a roller rug at its tip so as to be rotatable about an axis S. As shown in FIG. The outer peripheral surface of this roller protrudes outward beyond the tip of the tip guide plate 3. The tip guide plate 7 is rotatably supported at the rear end by a third kite plate 7 by a support IIIi6. This a-th guide plate 7 and the tip guide plate 3
A link g is connected between the two ends, and one end of this link g is rotatably supported by the tip guide plate 3 by a shaft 9, and a bottle 10 is provided protruding from the other end. This pin 10 is fitted into a linear guide hole l/ bored in the a-th guide plate 7. The link g is positioned outwardly from the support shaft 6 with respect to the rotation of the tip guide plate 3 in the direction of the arrow, and this link is connected to a stopper pin t2 protruding from the a-th guide plate 7.
At the same time, the tip guide plate 3 centered on the support 1 Pli 16
Zero rotation is limited to a predetermined angle range shown by two-dot chain lines A and B. In this way, the link g and the stopper pin 1
2 constitutes a restricting means for restricting the rotation of the tip guide plate 7. The above-mentioned co-guide plate 7 is rotatably supported by the third kite plate /3 at the rear end thereof about the support shaft /+. The third guide plate 13 and the λ-th guide plate 7 are connected to the link /3 of 1, the cylinder 111b, the bottle /7, and the guide hole 7g, respectively, to the upper hL1 link g, the shaft 9, the pin IO, and the guide hole l/. This is Park I-seong.

The third kite plate 13 is connected to a driving part phase iq in which a plurality of guide plates (not shown) are connected in series. Guide plate 7 after this drive part ladle/9 and 11 guide plate. /3... constitutes a drive unit that drives the tip guide plate 3.

Next, the roller rack and support shaft 6. /'l, and the shape of each guide plate 3, 7, 13). ．． If the straight line connecting 1. From prescribed disaster 1. Only eccentric. In other words, the straight line i connecting the roller + <1 and the support shaft 6
f3!1t is the driving force acting direction 1. It is inclined at a predetermined angle θ with respect to the surface.

The outer shape of the tip guide plate 3 is an inclined surface 3 that descends almost directly (3) from the tip where the roller is attached toward the support shaft B.
a, a convex surface 3b that continues to the end of this inclined surface 3a, and a straight surface 3C that connects this convex surface 3b and the rear end of the tip kite board.
, a straight line surface 3d rising from the tip and descending substantially parallel to the straight line 11, and a notched straight surface 3e that can still come into contact with the stopper bin/2. The convex surface 30 may be a curved surface or a polyhedron with rounded corners. Third
The guide i7 has the same shape as the tip guide plate 3 and #1, except that a notch-like slope 7 is formed near the tip. This inclined surface 7a prevents the shaft 9 from coming into contact with the co-guide plate 7 when the tip guide plate 3 rotates in the direction of the arrow. The third guides i/, j have the same shape as the second guide plate 7.

A pair of guides having the above configuration is prepared, and as shown in FIG. Place the visual inspection equipment 2/ on the inner surface of the tube through the 3°, ? The locking plate; 1. : 12 and attach the external device 2/ to the guide plate J, 3 at the end Vj4. This appearance 1 device 2/ and the tip guide plate? , 3, the displacement is relatively small due to the intervention of the sliding portion $420.2θ. In addition, the external appearance of the container 2/ is attached to the main body of the inspection device by an optical fiber (not shown), and this optical fiber is held by a third guide plate Φ1°.

The construction of this guide 1j11 for the tube inner surface appearance inspection device d will be explained below.

The guide is inserted into the tube to be inspected as shown in FIG. When the roller comes into contact with the inner surface of the tube at the point, since the roller is eccentric with respect to the direction of action of the driving force 1, a rotational moment corresponding to the eccentricity d of 7 acts on the tip guide plate 3.As a result, the roller q rotates in the direction of the arrow around the axis S,
The tip guide plate 3 rotates in the direction of arrow E. At this time, the tip guide plate 3 moves smoothly along the inner surface of the curved tube due to the presence of the inclined surface 3a. As a reaction force of the rotation of the distal end guide plate 3, the following first and third guide plates 7. /3 is pressed against the dorsal side of tube l. Also the 9th
In Figure (1)), the contact point P between the tip guide plate 3 and the inner surface of the tube l and the support shaft 6 are deviated by a distance d, so
Due to the action of the driving force, the tip guide plate 3 has its inclined surface 3a,
The convex surface 3b moves in the direction of arrow F while sliding on the inner surface of the tube. If the drive is continued further, Fig. 1 (C) and Fig. 3 (
As shown in d), the second guide plate 7 and the third guide plate 13 sequentially aim at the bent portion of the tube. When the roller q comes into contact with the lower surface of the tube 1 as shown in FIG. In this way, the distal guide plate 3 guides the external device to a desired location within the canal.

[Other embodiments of the invention]

As the rotation limiting means for the tip guide plate 30, a notch 23 formed in the co-guide plate 7 can be used instead of the stopper bin/20 shown in FIG. The shape of this notch 3 is the second
The shape is the same as that shown by two-dot chain lines A and B in the figure.

FIG. 6 shows another embodiment of the present invention, in which the shape of the tip guide plate 3 is approximately an isosceles triangular shape with the apex at the position of the roller head, and in order to maintain the eccentric relationship between the support shaft 6 and the roller head. , the support shaft 6 is shifted from the center of the tip guide plate 3 to the end. A bottle protruding from the tip guide plate 3 and the co-guide plate 7! <7, , u is the tip guide plate 30
Acts as a rotation limiter.

In the above embodiment, the external appliance is held by a pair of guides, but it may be held by a single guide. In addition, the number of guide plates 3, 7°/3. can be increased or decreased as necessary; for example, in order to inspect only the vicinity of the bent part of one tube, only the tip guide plate 3 is sufficient and it is necessary to drive it. Although it is convenient to attach it directly to the member /9, a large number of guide plates are required in order to inspect a sufficiently far distance from the bent portion.

FIG. 7 shows another embodiment of the present invention under additional pressure.
A bellows is used instead of a guide plate, etc., and this bellows 2
This is an example in which the tip guide plate 3 is cut out several times.

Although each of the above-mentioned embodiments is related to a guide for a tube inner surface appearance inspection device, the guide according to the present invention can also be applied to a guide for an ultrasonic flaw detection device, an eddy current flaw detection device, or a radiation flaw detection device. The tip guide plate will hold the sensors of these flaw detection devices or the super-tracking wave source, eddy current source, and radiation source.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the rear end of the tip guide plate is supported rotatably within a predetermined angular range on the drive unit by the support shaft, and the tip guide plate is provided with a portion that protrudes from the tip. Since the roller is rotatably installed and the roller is positioned eccentrically from the support shaft, when the roller comes into contact with the inner surface of the tube at the bent portion of the tube, a rotational moment is generated due to the eccentricity. The tip guide plate automatically rotates around the support shaft and can bend around the bend. Therefore, by using the guide according to the present invention, the front and inner surface inspection equipment can non-destructively inspect not only straight pipes and gently curved pipes, but also bent pipes bent at right angles, acute angles, and angles.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the relationship between the appearance instrument and the curved pipe of a conventional tube inner surface inspection device, Fig. 2 is a front view showing an embodiment of the guide for the layered inner surface inspection device according to the present invention, and Fig. 3 is a plan view showing a state in which the external device is attached to the guide of the above embodiment, and q.
Figure (aJ('bHc)(d) is a front view schematically showing the operation of the above embodiment, Figure S is a sectional view showing a modification of the above embodiment, and Figure 6 is another embodiment of the present invention. FIG. 7 is a front view schematically showing another embodiment of the present invention. 3. Tip guide plate, Ri... Roller, 6.・Support shaft, 7...th λ guide plate, g...su;/ri, /2...
- Nutonopabin, /3... λth guide plate, /9... Drive member, g, t2... Limiting means, ? , /3. /9...
Drive part. Izuhara's personal representative Inomata Seigayu 6 Figure 4

Claims (1)

[Scope of Claims] / A distal guide plate, a drive unit rotatably supporting the rear end of the distal guide plate by a support shaft and driving the distal guide plate, and a drive unit configured to rotate the distal guide plate in a predetermined manner. a limiting means for limiting the angle within an angular range; and a roller rotatably supported at the tip of the tip guide plate, wherein at least a portion of the roller protrudes from the tip of the tip guide plate. , The roller is eccentric from the support shaft with respect to the direction of action of the driving force extending from the drive unit to the tip guide plate, that is, the straight line connecting the support shaft and the roller is eccentric to the direction of action of the driving force. The upper h12 end of the iMfA kite board is characterized by a 41-plane incline descending from the support part of the roller to the support shaft, and this inclination. A guide for an inner surface inspection device according to Patent No. 6J14, No. i 9H, characterized in that it has a convex surface continuing from the end of the surface. 3. A patent characterized in that the drive unit includes an a-th guide plate that supports the tip guide plate by the support shaft, and a third kite plate that rotatably supports the λ-th guide plate. d. Scope of blue water A guide for a pipe inner surface inspection device according to claim 1. (e) The drive unit includes a bellows that supports the tip guide plate by the support shaft. A guide for a pipe inner surface inspection device according to S. The limiting means includes a link provided between the distal guide plate and the drive section, the link is pivotally supported at one end by the distal guide plate, and the other is pivoted on the distal guide plate. 2. The guide for a pipe inner surface inspection apparatus according to claim 1, wherein a bottle is provided protrudingly at the end, and the bottle is fitted into a guide hole bored in the drive section.