JPH10148766A - Industrial endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To offer an industrial endoscope with a rotary grinding member in little danger of grinding a part other than a part to be ground such as blades of a jet engine, etc. SOLUTION: The tip of a slender insertion part 11 is provided with a tip part 13 via a curvature part 14, and a grinding stone 12, which is a rotary grinding member connected with a shaft part 25 at the tip part of a torque transmission member inserted into the insertion part 11 for transmitting torque, is provided so as to project from the tip part 13. This grinding stone 12 is structured to have non-grinding edge parts 45a, 45b at the peak part and rear end part and have a grinding edge part 46 on a surface between them. Thus, in the case of repair by grinding damaged part easily generating on edges of compressor blades, etc., this arrangement reduces such a situation as the tip part of the grinding stone 12 grinds by mistake inner walls adjacent to the damaged part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an industrial endoscope for performing a treatment for removing a damaged portion by grinding a damaged portion such as a blade inside a jet engine.

[0002]

2. Description of the Related Art During operation of a jet engine, birds, stones, ice and the like are sucked, and the internal turbine blades and compressor blades may be damaged. Uses an industrial endoscope with rotary grinding means for continued use of the engine to grind and remove the damage that has occurred on the leading and trailing edges of the blade, so that stress concentration does not occur during operation on the blade Techniques for grinding and repairing are known.

[0003] It is known that flaws generated on a blade often occur on the tip side of the blade. In order to remove the flaw on the tip side by grinding, it is necessary to pay attention so as not to scrape the inner wall of the jet engine near the tip of the blade.

When a grindstone, which is a rotary grinding member, is brought into contact with a stationary blade, the grindstone is flipped and the grindstone moves in an unintended direction. Workers must work carefully with this in mind.

Also, when a rotating grindstone is pressed against the edge of the blade to grind these edges,
The operator pays attention so that the rotating grindstone does not hit the side surface of the blade or the inner wall of the engine which should not be damaged due to the contact between the grindstone and the blade. As a prior art for performing such a treatment by grinding, R.S. Wol
There is Blending Scope manufactured by f company.

[0006] This R. Blending by Wolf
A grindstone to which diamond abrasive grains are adhered is used for the rotary grinding means of Scope. For this, a grinding stone having a triangular pyramid shape is used. Except for the rotation axis of the whetstone, diamond abrasive grains are all attached to the surface of the triangular pyramid.

Further, as a prior art relating to a technique in which the shape of a rotary grinding means provided in an industrial endoscope is devised, Japanese Patent Laid-Open No.
No. 103810. This is obtained by chamfering corners of a cylindrical grindstone.

[0008]

SUMMARY OF THE INVENTION Wolf Bl
The problem with the triangular pyramid-shaped grindstone to which the diamond of the endoscope is attached is that when grinding the leading edge or trailing edge of a turbine blade or a compressor blade, a portion other than the blade near the blade together with the blade (for example, an engine inner wall) If the grindstone touches), there is a risk that the touched portion may be ground.

In addition, when a grindstone is flipped while pressing a rotating grindstone to grind these edges,
Since the abrasive grains adhere to the entire circumference of the whetstone, there is a possibility that a part that should not be damaged may be damaged.

The problem of Japanese Patent Application Laid-Open No. 3-103810 is that, since there is a cutting edge on the front surface of the grindstone (including the chamfered portion), the same as above, except for the portion other than the blade edge, is ground. It is a risk that

(Object of the Invention) The present invention has been made in view of the above points, and is intended for industrial use having a rotary grinding member, such as a blade of a jet engine, which is less likely to grind a portion other than a portion to be ground. It is intended to provide an endoscope.

[0012]

A shaft portion is rotatably supported at the distal end of an elongated insertion portion, and a rotary blade provided at the distal end of the shaft portion with a grinding blade portion for grinding a portion in contact with a surface to be rotated. In an industrial endoscope having a grinding member, the rotary grinding member is provided with a non-grinding blade portion that does not perform grinding at at least one end, so that when the rotary grinding member cuts a portion to be ground such as a blade, an error occurs. Even if the end portion is brought into contact with the inner wall of the engine or the like close to the portion to be ground, the non-grinding blade portion is provided at the end portion, so that the grinding can be effectively prevented.

[0013]

Embodiments of the present invention will be specifically described below with reference to the drawings. (First Embodiment) FIGS. 1 to 4 relate to a first embodiment of the present invention, and FIG. 1 shows the entire configuration of an industrial endoscope apparatus having the first embodiment. FIG. 2 shows the structure of the distal end of the industrial endoscope according to the first embodiment, FIG. 3 shows an explanatory view of the operation of the present embodiment, and FIG. 4 shows the relationship between the viewing angle and the opening angle of the grindstone. Show the relationship.

An industrial endoscope device 1 shown in FIG. 1 includes an industrial endoscope 2 as a device main body and a CCD detachably mounted on the rear end of the industrial endoscope 2 by screwing. Camera 3
The light source connector 5 at the end of the light guide cable 4 extending from the rear end face of the industrial endoscope 2 is detachably connected to the light source device 6 for generating illumination light, and inserted into the light guide cable 4. CC via a signal cable
An LCD monitor 7 electrically connected to the D camera 3, and a power supply device 8 electrically connected to the industrial endoscope 2, the CCD camera 3 and the LCD monitor 7 to generate driving power. .

The industrial endoscope 2 includes a box-shaped operation unit 9A,
An adjusting ring 1 provided at the front end of the operation portion 9A, is rotatable in a circumferential direction in a ring shape, and adjusts a bending angle by turning.
0, an elongated insertion portion 11 extending from the front end of the adjustment ring 10, and a grindstone 12 as a rotary grinding member provided to protrude from the tip of the insertion portion 11.

The insertion portion 11 includes a hard portion 19 formed of a hard and elongated mantle tube via a connecting member on the front end side of the adjustment ring 10, a curved portion 14 formed at the tip of the hard portion 19, And a hard tip 13 formed at the tip of the curved portion 14. Note that the length measuring probe 4 described in the third embodiment is provided at the rear end of the operation unit 9A.
A probe operation unit 9B for operating the advancing and retracting of the probe 8 is provided.

In this embodiment, the curved portion 14 formed adjacent to the rear end of the distal end portion 13 of the distal end of the insertion portion 11 is fitted to the first wire 15 and the second wire 16 mutually. And a gap 17 provided with a plurality of pieces 18 movable in the axial direction so as to be spaced apart from each other by a predetermined distance d.
The wire 16 can be bent in the gap 17 by being pulled toward the user.

A motor (not shown) and a motor drive control circuit for controlling the rotation of the motor are provided inside the operation unit 9A. The rotation of this motor is performed by the rigid portion 19 of the insertion portion 11,
The power is transmitted to the grindstone 12 as a rotary grinding member via a rotational force transmitting member inserted into the gap portion 17 and the distal end portion 13 of the curved portion 14.

That is, the first rotating force transmitting member 20 made of a metal pipe shown in FIG. 2 is connected to the rotating shaft of the motor, and the first rotating force transmitting member 20 is connected to the rigid portion 19 of the insertion portion 11. And is connected to the first base 21.

The first base 21 is rotatably supported by a bearing 22 mounted inside the insertion portion 11, and a detachable second base 23 is attached to the distal end of the first base 21.
Is connected to the rear end of the second torque transmitting member 24 having flexibility.

The distal end of the second torque transmitting member 24 is connected to a shaft portion 25 at the base end (rear end) of the grindstone 12. Large-diameter hole 27a on the tip side of attachment hole 27 provided in tip 13
A pipe member 26 impregnated with oil is attached to the shaft member 25, and the shaft portion 25 is rotatably supported by being fitted to the pipe member 26.

Each piece 18 is also provided with a hole 28 having an inner diameter through which the second base 23 can be passed.
Second torque transmitting member 24 having an outer diameter smaller than that of base 23
Is inserted.

The mounting hole 27 of the tip 13 has an inner diameter that allows the second base 23 to pass through. The grinding wheel 12, the second rotational force transmitting member 24, and the second base 23
Of the second base 23 is inserted through the mounting hole 27 of the first base.
The second rotational force transmitting member 24 is inserted into these holes 27 and 28 in the mounted state as shown in FIG.

A rotation adjustment knob 29 is provided at the rear end of the operation unit 9A in FIG. 1. By operating the rotation adjustment knob 29, the rotation speed of the motor can be controlled through the motor drive control circuit. it can. Further, a switch 30 is provided on the front surface of the operation unit 9A, and the rotation / stop of the motor can be controlled via a motor drive control circuit.

A light guide 31 (see FIG. 2) as an illuminating light transmitting means and an image guide 32 as an image transmitting means are inserted into the insertion section 11, and the rear end of the light guide 31 is an operation section. It reaches the base receiver at the rear end of 9A, and is connected to the light source device 6 via the light guide cable 4 connected to the base receiver.

Then, the illumination light generated by the lamp inside the light source device 6 is transmitted. The distal end of the light guide 31 is attached to the distal end portion 13 and is emitted to the front side through an illumination lens 33 (see FIG. 1) attached to an illumination window so as to face the distal end surface to illuminate the inspection site.

In FIG. 1, the light guide 31, the image guide 32 and the second torque transmitting member 24 exposed in the gap 17 of the curved portion 14 are omitted. As shown in FIG. 2, an observation window is provided at the distal end portion 13 (adjacent to the illumination window), and an objective lens 34 for attaching an optical image of the illuminated inspection site to an image forming position is attached to the observation window. The image guide 32 is arranged such that the front end surface is located at this image forming position.

That is, as shown in FIG. 2, an objective lens 34 is fixed to a hole forming an observation window via a lens frame (not shown). It is fixed.

The image guide 32 is formed of a fiber bundle in which thin fibers are bundled, and has flexibility. The image guide 32 is covered with a flexible, low-friction protective tube 36 such as Teflon. The tip of the protective tube 36 extends to near the rear end of the base 35.

The image guide 32 covered with the protective tube 36 is provided with an image guide insertion hole 37 provided in the piece 18.
Is transmitted, and the image formed on the front end face is transmitted to the rear end face fixed in the operation section 9A.

An image guide 3 is provided inside the operation section 9A.
An imaging optical system is provided facing the rear end surface of the CCD 1.
An image is formed on an imaging surface of a CCD (not shown) provided inside the camera 3. The CCD performs photoelectric conversion into an image signal, and the image signal is input to a video processing circuit provided in the CCD camera 3 or the operation unit 9A.

A video signal is generated by this video processing circuit, and the video signal is transmitted by a signal cable inserted through the inside of the light guide cable 4 and the like, output to the LCD monitor 7, and formed on the monitor screen by the objective lens 34. Display the image.

Each piece 18 has an image guide insertion hole 37.
In addition, a light guide insertion hole that allows the light guide 31 to be inserted is provided. Like the image guide 31, the light guide 31 is also formed of a flexible fiber bundle in which thin fibers are bundled, and is covered with a flexible protective tube 39. The fixing structure at the tip 13 is the same as that of the image guide 31.

In the present embodiment, a curved portion 14 is provided at the distal end of the insertion portion 11, and the position of the curved portion 14 is formed so as to be movable in the axial direction of the insertion portion 11. As shown in FIG. 2, the plurality of pieces 18 have a short columnar shape provided with through holes (37 and the like) through which the light guide 31, the image guide 32, and the second torque transmitting member 24 pass.

A fitting portion formed by cutting out the outer peripheral surface so that the annular portion 41 is fitted to the leading end surface of each piece 18 and the annular portion 41 (at the leading end of the adjacent piece 18) is fitted to the rear end surface. 42 are provided respectively. A fitting portion 42 is also provided on the outer peripheral surface of the rear end of the front end portion 13. Each piece 18 has the first wire 1
A fitting hole 43 is provided for fitting the fifth wire rod 16 and the second wire rod 16 so that the wire rod can be inserted therethrough.

The first wire 15 and the second wire 16 constituting the curved portion 14 are each two. However, it may be other than two. First wire 15 and second wire 16
The second wire 16 is arranged inside the curve in the direction in which the tip 13 is curved, and the first wire 15 is arranged outside the curve.

The first wire 15 and the second wire 16 are pieces 18
Is slidably fitted in the fitting hole 43 provided in the first hole. It does not move under its own weight, but has enough friction to move it by hand.

When the bending operation is performed by rotating the adjusting ring 10 in the state indicated by the solid line in FIG. 2, for example, the rear end of the front end portion 13 and the leading end piece 18 spaced from the rear end by the distance d are formed. 2, the annular portion 41 of the foremost piece 18 is fitted to the fitting portion 41 of the tip 13 as shown by the two-dot chain line in FIG.
The gap 17 moves between the topmost piece 18 and the next stage piece.

Therefore, if the bending operation is performed in this state, the bending is performed between the topmost piece 18 and the next stage piece.
In this embodiment, since a plurality of (specifically, four or more) pieces 18 are provided, the position of the bending portion 14 can be moved by moving the pieces 18 in the axial direction.

The second wire 16 forming the curved portion 14
Is fixed to the distal end portion 13 by caulking. The rear end side of the second wire 16 is provided with a fitting hole 43 of the piece 18.
And is fixed to a slide member that moves in the axial direction in accordance with the rotation of the adjustment ring 10 shown in FIG. 1 in the circumferential direction. The second wire 16 is inserted into the insertion portion 11 (the fitting hole 43 of the piece 18).
Etc.).

As the second wire 16, a shaft made of a metal elastic body having both straightness and flexibility is used. Specifically, a superelastic alloy of a Ni-Ti alloy is used. The material of the first wire 15 is also the same.

The first wire 15 is fixed such that a gap 17 between the rear end of the tip 13 and the tip of the piece 18 keeps a constant distance d. Even if they are not fixed, they may not be fixed as long as the bag-shaped holes (eye holes) are provided at the distal end portion 13 and the distal end portion of the insertion portion 11. Further, by moving the piece 18 in the axial direction as described above, it is possible to form a new gap portion 17 in another place.

In this embodiment, for example, a conical grinding wheel 12 which is rotationally symmetric as shown in FIG. 2 is used as a rotary grinding member. Without a grinding blade portion (or a grinding portion), non-grinding blade portions 45a and 45b are provided at a front end portion and a rear end portion, and a grinding blade portion is provided on a surface of an intermediate portion therebetween. 46 is provided.

The grinding stone 12 is fixed to the surface of the intermediate portion of a conical grinding stone base material (for example, stainless steel) so that diamond abrasive grains are studded.
A grinding blade portion 46 of the grindstone 12 is formed. On the other hand, non-grinding blade portions 45a and 45b that do not grind the portion in contact with the surface are formed at the front end portion and the rear end portion of the whetstone base material without being studded with diamond abrasive grains. ing.

As described above, in this embodiment, the grinding blade portion 46 is provided on the surface of the intermediate portion so as to be able to grind and remove the repaired portion of the blade to be ground, particularly when performing the grinding repair inside the jet engine. And by providing the non-grinding blade portions 45a and 45b at the leading end and the trailing end, the non-grinding blades 45a and 45b come into contact with the peripheral surface area of the grinding repair point or a part other than the blade (for example, in the casing or blade inside the engine). To reduce the risk of scratching.

Next, the operation of the present embodiment will be described. The plug of the power supply 8 shown in FIG. 1 is connected to a commercial outlet, and a power switch (not shown) is turned on. Electric power is supplied to the LCD monitor 7, the industrial endoscope 2, and the CCD camera 3.

The video signal that has been subjected to photoelectric conversion by the CCD camera 3 and subjected to signal processing is sent to the LCD monitor 7 and displayed as an image, so that the operator can confirm the operator on the monitor screen. When the switch 30 provided on the operation unit 9A is turned on, the motor rotates, and the grindstone 12 rotates following this rotation. When the switch 30 is turned off, the rotation of the motor stops. Rotating the rotation adjustment knob 29 changes the rotation speed of the motor,
The rotation speed can be set to a value suitable for the grinding process.

When the adjusting ring 10 shown in FIG. 1 is rotated, the bending angle of the bending portion 14 changes. Adjustment ring 10 clockwise
When the is rotated, the slide member is pulled upward. Following this, the second wire 16 is pulled toward the hand. First
Since the positions of both ends do not move, the wire 15 simply bends. Thereby, the bending portion 14 can be bent.

When stainless steel or piano wire is used for the wire, the curvature is insufficient, and the rigidity against the curvature is too high to realize a sharp curve with a small radius of curvature. Also,
Buckling and plastic deformation may occur. In the present embodiment, since the first wire 15 and the second wire 16 are formed using a superelastic alloy, they are steep at an angle nearly perpendicular to a substantially L-shape as shown in FIGS. It is possible to bend.

The bending angle can be adjusted to an arbitrary angle by performing a bending operation for changing the rotation angle of the adjustment ring 10. Also,
Sufficient rigidity (strength for maintaining a curved shape) is obtained. The light guide 31, the image guide 32, and the second rotational force transmitting member 24, which are inserted in the vicinity of the curved portion 14, have room in the gap 17 of the curved portion 14 and are arranged without interfering with each other, and each of them is curved. The second torque transmitting member 24 also bends similarly to the image guide 32 as shown in FIG.

To return the curvature to a straight line, the adjustment ring 10 is rotated in the opposite direction. The slide member follows and moves to the distal end side. The bending is released when the second wire 16 that has been pulled toward the hand moves toward the distal end. First wire rod 1
5. Since the second wire 16 itself has flexibility and straightness, the curved portion 14 forming the insertion portion 11 returns to a straight line by the restoring force.

Further, since the plurality of pieces 18 can be moved back and forth in the axial direction, if the pieces 18 are moved along the first wire 15 and the second wire 16 in the axial direction, the position of the bending portion 14 is moved in the axial direction. be able to. Thereby, the distance from the bending portion 14 to the distal end side can be freely changed.

The operation at the time of grinding inside the engine will be described with reference to FIG. The bending portion 14 is inserted straight into the inspection hole 51 of the engine from the distal end portion 13 side of the insertion portion 11 to the bending portion 14 and the vicinity of the rear piece 18, and the adjustment ring 10 on the hand side is rotated to bend the bending portion 14.

While confirming the observation image, the conical whetstone 12
Closer to the damaged compressor blade 52. The user turns on the switch 30 to rotate the grindstone 12. Compressor blade 52
Then, the damaged portion of the compressor blade 52 is ground by contacting the damaged portion.

As described in the section of the prior art, many damaged portions are generated on the blade tip surface of the compressor blade 52 or the like. Since the engine inner wall 53 is present on the front end face through a narrow gap, the operator needs to carefully perform the grinding operation. The engine inner wall 53 is on a surface substantially orthogonal to the axial direction of the inspection hole 51 (the axial direction is closer to the hand side than the curved portion 14 of the insertion portion 11).

In this embodiment, as shown in FIG. 3 (B), the worker erroneously touches the tip of the grindstone 12 to the engine inner wall 5.
Even if a part that should not be ground, such as 3, is touched, the non-grinding blade portion 45a without a grinding blade is provided at the tip of the grindstone 12, so that the engine inner wall 53 is not damaged.

This embodiment has the following effects. According to the present embodiment, in the operation of grinding the edge or the like of the tip of the blade such as the compressor blade 52 or the like to remove a damaged portion, the tip of the grindstone 12 is mistakenly attached to the engine inner wall 53.
Even if they are brought into contact, the non-grinding blade portion 45a is provided at this tip, so that damage can be prevented.

In other words, when grinding a damaged portion, there is an effect that it is possible to effectively prevent the possibility of damaging an unintended portion such as a portion that should not be ground near the damaged portion.

In FIG. 3, the compressor blade 52
Although the operation in the case of repairing the damaged portion of the leading edge by grinding has been described, when grinding the damaged portion other than the leading edge, the rear end of the grindstone 12 may grind an unintended portion. By providing the non-grinding blade portion 45b also at this rear end portion, it is possible to reduce the possibility that an unintended portion is damaged by grinding. The first
As a modified example of the embodiment, the non-grinding blade portion 45a may be formed only at the front end portion of the grindstone 12, and the rear end portion may be provided with a grinding blade portion.

By the way, the whole area of the abrasive grains in the field of view of the industrial endoscope 2 may not be visible depending on the conical opening angle β of the cone. Tip 1 of a conventional industrial endoscope
This state is shown in FIG. 4B at 3 '. This figure 4
In (B), the opening angle β of the grindstone 12 ′ and the objective lens 34 ′
The relationship between the viewing angle α and the opening angle β is larger (that is,
β> α). In this case, the operator becomes more difficult to observe the tip of the conical whetstone 12 ', and cannot accurately recognize the contact state between the whetstone 12' and the blade. Therefore, extra care must be taken during the grinding operation.

On the other hand, in the present embodiment shown in FIG. 4A, the viewing angle α is larger than the opening angle β (that is,
Since β <α), the tip of the grindstone 12 can be observed.

As described above, the opening angle β is set so that at least the range of the grinding blade portion 46 having the abrasive grains on the side surface on the viewing side of the conical whetstone 21 falls within the range of the viewing angle α of the industrial endoscope. When the setting is set, the grinding operation can be performed in a state where the entire length of the side surface of the grindstone 12 on the visual field side is always visible within the visual field range, so that a worker is not worried that the grindstone cannot be seen and the burden can be reduced.

In the first embodiment, the grinding blade portion 46 of the grindstone 12 is formed so that diamond abrasive grains are studded on the surface of the grindstone base material. However, the present invention is not limited to this. For example, a cutter formed of a hard metal may be used.

(Second Embodiment) FIG. 5 shows a second embodiment of the present invention.
1 shows a structure of a distal end side of an industrial endoscope according to an embodiment. In this embodiment, a substantially spherical grindstone 55 is used instead of the conical grindstone 12 as the rotary grinding member in FIG.
Has been adopted. The grindstone 55 has a non-grinding blade portion 56 formed at the tip of a substantially spherical surface, and a grinding blade portion 57 is formed at the rear end side of the non-grinding blade portion 56. The rear side of the shaft portion 25 of the grindstone 55 is provided with the enlarged diameter hole portion 27 of the tip portion 13.
a rotatably supported by a pipe member 26 fixed to
This shaft portion 25 is connected to the second torque transmitting member 24.

The other structure is the same as that described with reference to FIG. Next, the operation of the present embodiment will be described with reference to FIG. Also in this case, a case will be described in which a damaged portion generated at the edge of the compressor blade 52 inside the engine is removed by grinding. As described in the first embodiment, the grindstone 55 protruding from the tip portion 13 is set near the target edge of the compressor blade 52 and rotated.

Then, the damaged portion is ground by applying the grinding blade portion 57 to the damaged portion (this state is shown by a two-dot chain line in FIG. 6), and the damaged portion is repaired by forming a smooth concave shape. in this case,
Even if the grinding blade portion 57 is erroneously slid and brought into contact with the side surface of the compressor blade 52 as shown by the solid line in FIG. 6, the non-grinding blade portion 56 is formed at the tip end. Can be prevented from being damaged. As described above, also in the present embodiment, it is possible to effectively prevent a part other than a part to be ground from being erroneously scratched.

FIG. 7 shows a grindstone of a modification of the second embodiment. FIG. 7A shows a shaft part 25 provided with a thread-wound grindstone 61 at the tip thereof. The grindstone 61 is provided with non-grinding blades 62a and 62b at the front end and the rear end, respectively, and the grinding blade 63 is provided on the thread-wound surface between them.

The grinding stone 64 shown in FIG. 7B has a conical shape whose diameter is enlarged on the front end side. Non-grinding blade portions 65a and 65b are provided at the front end portion and the rear end portion, respectively. A grinding blade 66 is provided.

The grindstone 67 of FIG. 7C has a conical shape whose diameter at the rear end is enlarged like the first embodiment, and the non-grinding blades 68a and 68b are formed at the front and rear ends, respectively. And the conical surface between them is chamfered so as to be recessed from the non-grinding blade portions 68a and 68b at the front and rear ends, and the grinding blade portion 69 is provided at this portion.

The grinding stone 70 shown in FIG. 7D has a substantially spherical shape similarly to the second embodiment. Non-grinding blades 71a and 71b are provided at the leading end and the trailing end, respectively. The non-grinding blades 71a, 7 at the front and rear ends
The grinding blade portion 72 is provided in this portion in a shape in which chamfering is performed with a depth lower than 1b.

Also, the grindstone 73 in FIG.
Similarly, the front end has a conical shape whose diameter is increased, and non-grinding blades 73a and 73b are provided at the front end and the rear end, respectively.
The spherical surface between them is chamfered so as to be recessed from the non-grinding blade portions 73a and 73b at the front and rear ends, and the grinding blade portion 74 is provided at this portion. FIG.
The functions and effects of the modified examples of FIGS. 7A to 7E are substantially the same as those of the second embodiment.

(Third Embodiment) Next, a third embodiment of the present invention will be described. 8 to 12 relate to the third embodiment, FIG. 8 shows that the length measuring probe is inserted into the insertion portion, FIG. 9 shows the structure of the distal end side of the insertion portion, and FIG. FIG. 11 shows an arrangement of each member on the distal end surface of the portion, and FIG. 11 shows an image of an observation visual field displayed on a monitor.
Reference numeral 2 denotes the structure of the probe operation unit.

In the present embodiment, for example, a length measuring means is provided in the second embodiment. As schematically shown in FIG. 8, the industrial endoscope 2 is provided with a length measuring probe 48. The length measuring probe 48 is inserted from the probe operating section 9B provided in the operating section 9A shown in FIG. It is inserted in the portion 11 (that is, the hard portion 19, the piece 18, the bending portion 14, and the tip portion 13) so as to be able to advance and retreat (in the direction indicated by the arrow). The distal end of the length measuring probe 48 is bent at substantially a right angle to form a reference length display section 75 as shown in FIG.

Then, by operating the probe operating section 9B, the length measuring probe 4 is moved as shown by a two-dot chain line in FIG.
The length measurement can be performed by making the tip side of 8 protrude forward and making contact with the object to be inspected. As shown in FIG. 9, a spherical grindstone 55 described in the second embodiment is provided at the distal end portion 13, and a length measuring probe 48 is inserted therethrough.

As shown in FIG. 10, the distal end of the length measuring probe 48 is bent at a substantially right angle from a direction parallel to the axis of the insertion portion 11, and the tip is slightly bent. The reference length display portion 75 is formed by the linear portion up to.

The light guide emission end 31a is arranged below the bent portion of the length measuring probe 48, and the light guide emission end 31a is further arranged below the observation window (objective lens 34).

The length measuring probe 48 is housed in a housing groove 76 one step lower than the end face of the tip portion 13 so that the length measuring probe 48 does not cover the upper light guide emission end 31a. The observation window and the grindstone 55 are arranged substantially horizontally. The reference length display section 75 of the length measuring probe 48 is located substantially opposite to the grindstone 55 across the observation window. In other words, the grinding wheel 55 and the tip of the length measuring probe 48 are arranged so as to be substantially opposed to each other with the observation window as a center. In the field of view)
The length can be measured. In the description of FIG. 9, the length measuring probe 48 is described as being movable back and forth. However, in FIG.

FIG. 11 shows an endoscope image obtained by observing the length-measuring probe 48 protruding to the distal end side. For simplification, images of the respective members are indicated by the same reference numerals as those of the members. A repair portion 77 is formed on the compressor blade 52 by grinding repair. The vertical dimension of the repair portion 77 is indicated by 77A, and the horizontal dimension of the repair site 77 is indicated by 77B. The reference length display section 75 is also in the field of view. Because of the above arrangement, the reference length display portion 75 is in contact with the surface of the compressor blade 52, for example, not in the vicinity of the grindstone 55.

The structure of the probe operating section 9B for moving the length measuring probe 48 forward and backward will be described with reference to FIG. (FIG. 12A shows a state where the length measuring probe 48 shown in FIG. 9 is retracted).

A probe operating portion 9B fitted to a cylindrical slide receiver 81 fixed to the rear end surface of the operating portion 9A and slidable is provided to protrude rearward. Slide receiver 8
The slide shaft 82 which can move back and forth with respect to 1 is provided with an inner hole (or an elongated hole) 83 extending from the distal end surface to the vicinity of the center in the longitudinal direction. ing.

An inner hole 83 is provided at the base end of the length measuring probe 48.
The probe fixing member 84 which can move forward and backward is fixed to the fixing screw 8.
5 fixed. That is, the probe fixing member 84 is formed with a screw hole communicating from a direction perpendicular to the hole into which the base end of the length measuring probe 48 is inserted, and the base end of the length measuring probe 48 inserted by the fixing screw 85 is formed. It is fixed to the probe fixing member 84 by being deformed.

The inner hole 84 further houses a close-wound spring 85 as urging means for urging the probe fixing member 84 in a direction protruding from the rear end face of the operating portion 9A, and has a hole through which the length measuring probe 48 passes. The provided cap 86 is attached to the opening end of the inner hole 83 by screwing.

Then, the operation of moving the probe operation section 9B forward from the state shown in FIG. 12 (A) is performed so that the end surface of the inner hole 83 of the slide shaft 82 comes into contact with the probe fixing member 84 to be pressed and moved. Then, the state shown in FIG. 12B is reached, and the tip of the length measuring probe 48 is moved forward from the position of the storage groove 76 in accordance with this pressing movement, so that the length can be measured.

Next, the operation of the length measuring probe 48 will be described. FIG. 12A shows a state of the probe operation section 9B when the length measuring probe 48 is retracted and the tip is stored in the storage groove 76 of the tip portion 13. The urging force of the close-wound spring 85 is applied to the probe fixing member 84 and the length measuring probe 4.
8, the distal end of the length measuring probe 48 is retracted and stored in the storage groove 76 of the distal end portion 13.

At this time, when the bending portion 14 is bent, the length measuring probe 48 and the probe fixing member 84 move toward the hand side by the urging force of the close-wound spring 85. Probe fixing member 84
The amount of movement can be absorbed by a gap between the inner hole 83 and the end face of the inner hole 83.

FIG. 12B shows the state of the probe operating section 9B when the tip of the length measuring probe 48 is put in the field of view of the endoscope (FIG. 12B shows the two-dot chain line in FIG. 8). (Corresponds to the state where the length measuring probe 48 is protruding).

From the state shown in FIG. 12A, the slide shaft 82 is pushed in the direction of the arrow B, as shown in FIG. 12B. The length measurement probe 48 is actually moved according to the pressing movement after the end face of the inner hole 83 and the probe fixing member 84 come into contact with each other.

As shown in FIG. 11, the length measuring probe 48 is set in the visual field.
While checking the position of the tip of the
By comparing the length of the measured length with the reference length display portion 75, the size of the measured length can be known.

The operation of grinding by the grindstone 55 is the same as in the second embodiment. According to the present embodiment, since the urging force is always applied to the hand side, there is no possibility that the length measuring probe 48 appears in the field of view when it is not intended and hinders observation and grinding. The other effects are the same as those of the second embodiment.

(Fourth Embodiment) Next, a fourth embodiment of the present invention will be described. FIG. 13 shows a configuration on the distal end side of the industrial endoscope according to the present embodiment. In the present embodiment, the optical axis of the objective optical system is provided to be inclined with respect to the rotation axis of the rotary grinding member. FIG. 13 corresponds to, for example, a cross section taken along line CC of FIG.

As shown in FIG. 13, a grindstone 55 forming a rotary grinding means is rotatably attached to the substantially cylindrical end portion 13 such that a direction parallel to the axis of the cylinder becomes a rotation axis 88. I have.

The objective lens system 34 and the objective lens system 34
The image guide 32 and the image guide 32 are fixed by the lens frame 89 such that the front end surface is located at the image forming position. The objective optical system mounting hole is not parallel to the rotation shaft 88, but is formed obliquely so that the distal end is separated. Therefore, the optical axis 90 of the objective lens system 34 is not parallel to the direction of the rotation axis 88, and the visual field direction on the optical axis 90 is formed so as to be directed obliquely away from the rotation axis 88. Other configurations are the same as those of the second or third embodiment. With such a configuration, even when the objective optical system is provided not so far from the rotation axis 88, the rotation axis 88 and the optical axis
As compared with the case where 0 is provided in parallel, the occupation ratio of the grinding portion of the grindstone 55 in the observation visual field is not too large, and has an effect of being able to be set to an appropriate value.

Therefore, there is an effect that the grinding operation can be improved without increasing the outer diameter of the insertion portion, particularly the distal end portion 13. Others are the same as the second embodiment.

By the way, when grinding the tip of the compressor blade as described above, the grinding wheel may come into contact with a part other than the compressor blade and grind an unintended part. Particular care must be taken when grinding parts.

In the present invention, a non-grinding blade is provided in order to reduce the possibility of grinding an unintended part. However, for example, in the case of a conical grinding wheel 91 (see FIG. 14) having no non-grinding blade. The following configuration may be adopted in order to reduce the burden of the worker paying attention.

As shown in FIG. 14, when the distal end side of the insertion portion 11 is inserted into the engine through the inspection hole 51 and the bending portion 14 is set to the maximum bending angle γ, the center of the insertion portion 11 or the bending portion 14 Also the center line of the piece 18 located on the hand side,
The opening angle β of the conical shape is set so that the conical whetstone 91 is substantially perpendicular to the contour line (inside the curve). In addition,
The opening angle β is twice the angle between the axis of the grindstone 91 and the conical surface.

The operation in such a setting is as follows. When the damaged portion of the leading edge portion of the compressor blade 52 is ground with the maximum curvature, the contour of the engine inner wall 53 and the conical grindstone 91 become substantially horizontal. The engine inner wall 53 is not ground.

Therefore, the possibility that the grindstone 91 comes into contact with the engine inner wall 53 is reduced, so that the burden of the operator on paying attention during grinding can be reduced. For example, the set maximum bending angle γ is 100
And the opening angle β is 20 degrees. This is the engine inner wall 5
3 and the contour of the conical whetstone 91 are determined to be substantially horizontal.

When the maximum bending angle γ and the opening angle β are determined so that the front end side of the grindstone 91 that is more conical than the horizontal is slightly closer to the engine inner wall 53, the portion that first approaches the engine inner wall 53 is determined. Can be identified. This can reduce the burden of paying attention during work.

It is apparent from the above description that the use of a grindstone (for example, 12) having a non-grinding blade at least at the tip as in the embodiment of the present invention can further reduce the burden on the operator. is there.

The present invention is not limited to a grindstone provided with a non-grinding blade at least at the front end (for example, 12). good. Also in this case, it is possible to prevent the possibility of grinding a portion that is not intended to be ground as compared with the conventional example in which the non-grinding blade portion is not provided at the rear end.

Therefore, the present invention belongs to the present invention that has a rotary grinding member such as a grindstone provided with a non-grinding blade at at least one of the leading end and the trailing end. It should be noted that embodiments and the like configured by combining the above-described embodiments and the like in a partial manner also belong to the present invention.

[Supplementary Notes] An industrial endoscope having a rotary grinding member in which a shaft is rotatably supported at a distal end of an elongated insertion portion and a grinding blade portion is provided for grinding a portion contacting a surface rotated at the distal end of the shaft. The industrial endoscope according to claim 1, wherein the rotary grinding member has a non-grinding blade portion that does not perform grinding on at least one end.

2. An industrial endoscope having a rotary grinding member having a shaft portion rotatably supported at the distal end portion of the elongated insertion portion and a grinding blade portion for grinding a portion contacting a surface rotated at the distal end of the shaft portion. The endoscope for industrial use according to any one of claims 1 to 3, wherein the rotary grinding member has a non-grinding blade portion that does not perform grinding at least at a tip portion thereof.

3. 2. The industrial endoscope according to claim 1, wherein a chamfered portion that does not perform grinding is provided at a front end portion and a rear end portion of the grinding blade portion of the rotary grinding member. 4. 2. The industrial endoscope according to claim 1, wherein the grinding blade portion is a diamond abrasive. 5. 2. The industrial endoscope according to claim 1, wherein the grinding blade is a cemented carbide cutter.

6. It has an elongated insertion portion, a curved portion at the distal end of the insertion portion, a distal end portion of the distal end of the curved portion, and a conical grinding blade portion that is rotatably attached to the distal end portion and that grinds the workpiece by rotating. In the industrial endoscope having the rotating grinding member, when the bending portion has the maximum bending angle, the axial direction of the insertion portion near the bending portion and the contour line inside the bending of the cone of the rotating grinding member are formed. An industrial endoscope characterized in that the angle is substantially constant.

(Background of Supplementary Notes 6 to 8) When grinding the damaged portion at the tip of the compressor blade, the grindstone easily comes into contact with the engine inner wall close to the compressor blade, and the operator grinds the vicinity of the tip of the compressor blade. You must work with great care in some cases. For this reason, the burden on the worker is increased, and it is difficult to perform the work more quickly. In order to alleviate this problem, the configurations described in Supplementary Notes 6 to 8 are adopted.

7. When the maximum bending angle is multiplied, the conical whetstone has an opening angle approximately twice as large as the angle between the surface of the insertion portion and the whetstone axis, and the distance between the tip side of the conical whetstone and the surface. 7. The industrial endoscope according to claim 6, wherein the bending angle and the opening angle are set such that the distance from the front end side to the surface is shorter in the distance from the rear end side to the surface. 8. 7. The industrial endoscope according to claim 6, wherein the certain angle is a right angle.

9. An insertion section having a bendable portion on the distal end side, a rotary grinding member rotatably mounted on the distal end portion of the distal end of the bending portion and rotating to grind an object to be ground, and a rotary grinding member for grinding; In an industrial endoscope provided with an observation optical system for observing a part, a length measuring means capable of moving back and forth with respect to the distal end portion is provided, and the rotary grinding member and the length measuring means are substantially opposed to each other around the objective optical system. An industrial endoscope, wherein the endoscope is disposed at a position where the endoscope moves.

(Background Art of Appendix 9) When repairing a compressor blade by grinding, the dimensions after grinding must be kept within a range of a standard value predetermined in an engine maintenance manual. Therefore, a measuring means is provided in the range of the field of view of the endoscope to measure the portion to be ground.

However, it has been difficult to arrange the rotary grinding member and the measuring means so that they can be observed at the distal end portion having a small outer diameter. For this reason, in order to be able to measure the length even at the tip portion having a small diameter, the configuration of Appendix 9 (specifically, the third embodiment) is adopted.

10. An insertion portion having a bending portion that is bendable on the distal end side, a rotary grinding member that is rotatably attached to the distal end portion of the distal end of the bending portion, and that rotates to grind the object to be ground, and is inserted into the insertion portion, In an industrial endoscope having a length measuring means capable of moving back and forth with respect to the distal end portion, the length measuring means is moved forward and backward from the hand side of the insertion portion, and the urging force of the length measuring means always toward the hand side. An industrial endoscope comprising an operation means for providing the endoscope.

(Background Art of Supplementary Note 10) When grinding and repairing a compressor blade, the dimensions after grinding must be kept within a range of a standard value predetermined in an engine maintenance manual. Therefore, a measuring means is provided in the range of the field of view of the endoscope to measure the portion to be ground.

In the case of a length measuring means which is inserted from the hand side to the tip side and can be advanced and retracted, if it is bent, its relative position with respect to the tip end face changes, for example. In this case, if the tip of the length measuring means protrudes toward the tip, there is a risk of obstructing observation and grinding. On the other hand, if it returns to the hand side, it may buckle inside the insertion portion or the operation portion.

In order to provide a length measuring means which appears in the field of view of the endoscope only when necessary, and when it is not necessary, stays in a predetermined position outside the field of view and does not affect the workability of observation and grinding.
0 (specifically, the third embodiment).

11. An insertion portion having a bending portion that can be freely bent on the distal side, and rotatably attached to a distal portion of the insertion portion,
In an industrial endoscope having a rotary grinding member for grinding a body to be ground by rotating, and an objective optical system for observing a portion to be ground by the rotary grinding member, the direction of the observation field of view by the objective optical system is rotationally ground. An industrial endoscope, wherein the endoscope is disposed at a distal end so as to be in an oblique direction away from a rotation axis of a member.

(Background of Appendix 11) When a grindstone serving as rotary grinding means and an observation optical system (objective optical system) are arranged at the tip,
The grinding part of the grindstone comes to the front of the objective optical system due to the restriction on the outer diameter of the tip. If the grinding unit is not in the observation image of the objective optical system, the grinding operation cannot be performed while looking at the observation image. However, if the occupation ratio in the visual field is too large, the grinding operation will be affected. A structure that improves the grinding workability without increasing the outer diameter of the distal end and the outer diameter of the entire insertion section is desired. For this reason, the structure of Supplementary Note 11 (specifically, the structure of FIG. 13) is adopted to ensure good grinding workability.

[0118]

As described above, according to the present invention, the shaft is rotatably supported by the distal end of the elongated insertion portion, and the portion that contacts the surface rotated by the distal end of the shaft is ground. In an industrial endoscope having a rotary grinding member provided with a grinding blade portion, since the rotary grinding member is provided with a non-grinding blade portion that does not perform grinding at least at one end, the rotary grinding member can be used as a blade or the like. Even if the edge is mistakenly brought into contact with the engine inner wall, etc. near the part to be ground when shaving the part to be ground, the non-grinding edge is provided at the end, effectively preventing grinding. it can.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an overall configuration of an industrial endoscope apparatus provided with a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the structure on the distal end side of the industrial endoscope according to the first embodiment.

FIG. 3 is an explanatory diagram of the operation of the present embodiment.

FIG. 4 is a diagram showing a relationship between a viewing angle and an opening angle of a grindstone.

FIG. 5 is a cross-sectional view showing a structure on the distal end side of an industrial endoscope according to a second embodiment of the present invention.

FIG. 6 is an explanatory diagram of the operation of the present embodiment.

FIG. 7 is a side view showing a configuration of a grindstone in a modification of the second embodiment.

FIG. 8 is a diagram showing that a length measuring probe is inserted into an insertion portion according to the third embodiment.

FIG. 9 is a cross-sectional view showing the structure of the distal end side of the insertion section.

FIG. 10 is a front view showing the arrangement of each member on the distal end surface of the insertion section.

FIG. 11 is a diagram showing an image of an observation visual field.

FIG. 12 is a sectional view showing the structure of a probe operation unit.

FIG. 13 is a cross-sectional view showing a structure on the distal end side of an industrial endoscope according to a fourth embodiment of the present invention.

FIG. 14 is a diagram showing a state in which the distal end side of an industrial endoscope is inserted into an engine to grind and repair a damaged portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Industrial endoscope apparatus 2 ... Industrial endoscope 3 ... CCD camera 4 ... Light guide cable 5 ... Light source connector 6 ... Light source device 7 ... LCD monitor 8 ... Power supply device 9A ... Operation part 10 ... Adjustment ring 11 ... Insertion part 12 ... Whetstone 13 ... End part 14 ... Bending part 15 ... First wire 16 ... Second wire 17 ... Void part 18 ... Piece 19 ... Hard part 20 ... First rotational force transmitting member 21 ... First Base 22 ... Bearing 23 ... Second base 24 ... Second rotational force transmitting member 25 ... Shaft 26 ... Pipe member 27,28 ... Mounting hole 29 ... Rotation adjustment knob 30 ... Switch 31 ... Light guide 32 ... Image guide 45a 45b Non-grinding blade part 46 Grinding blade part 52 Compressor blade 53 Engine inner wall

Claims (1)

[Claims] 1. A rotary grinding member having a shaft portion rotatably supported at a distal end portion of an elongated insertion portion and a grinding blade portion provided at a distal end of the shaft portion for grinding a portion in contact with a surface to be rotated. The industrial endoscope according to claim 1, wherein the rotary grinding member has a non-grinding blade portion that does not perform grinding at at least one end.