JP5303344B2 - Swing type rotation device - Google Patents

Description

  The present invention relates to an oscillating rotation device that enters a long and narrow pipeline that cannot be entered by humans and performs a predetermined machining operation on a machining surface in the pipeline, particularly when a sewer pipe is repaired. The present invention also relates to a swing type rotation device suitable for drilling from the side of the branch pipe to the junction of the main pipe and the branch pipe blocked by the correcting material.

  Conventionally, when repairing old pipeline facilities such as sewage pipes, the main pipe was dug out of the ground, but it was necessary to control traffic on the ground, and it was difficult to ensure quality and cost was high was there. For this reason, a correction technique has been put into practical use in which a correction material such as a thermosetting resin is pressure-bonded to the inner peripheral surface of the main pipe and repaired without digging out the main pipe from the ground. However, when repairing with this correction technique, the junction with the branch pipe connected to the main pipe from each home is blocked by the correction material, so the work of drilling this blocked junction I need it. When drilling this branch pipe junction, the operator mainly enters the main pipe and drills the branch pipe junction from the main pipe side. That's not true.

  In order to solve such a problem, the inventors of the present invention disclosed in Japanese Patent No. 3568947 a branch pipe merging port punching device for drilling a correction material blocking the merging port between the main pipe and the branch pipe. is suggesting. This drilling device moves in the narrow branch pipe to the junction by the moving means, expands and rotates the rotary cutting means in the radial direction, and connects the reaction force counter means to the rectifying material closing the junction, The correction material is cut along the inner peripheral surface of the merging port by opposing the axial reaction force and the reaction force around the axial line of the branch pipe received during the cutting by the rotary cutting means. (Patent Document 1).

Japanese Patent No. 3568947

  However, the correction material described above requires a considerable amount of time to be completely cured depending on the type thereof, and greatly expands and contracts with curing depending on the outside temperature and the construction distance during repair work. For this reason, if a main hole having the same diameter as the merging port is immediately drilled after the correction material is applied, there is a problem that the main hole is displaced from the merging port due to expansion and contraction due to the curing of the correction material. Depending on the degree of this positional deviation, there are cases where the correction work must be performed again.

  For such a problem, it is effective to drill a temporary hole having a diameter smaller than that of the merging port and separately drill the main hole after the correction material has been cured. Accordingly, the inventors of the present application have made intensive studies, and as a drilling tool for drilling a temporary hole, a hole saw is configured to be slidable with respect to a slide cover, as shown in FIG. A piercing tool for transmitting force was invented.

  However, the branch pipes are not only straight, but are laid while avoiding buried objects in the ground, and there are sites where the branch pipes are bent at a steep angle just before the junction. In this case, as shown in FIG. 12, since the rotation shaft of the hole saw abuts against the correction material obliquely, there is a problem that the drilling time becomes longer than in the case of abutting substantially vertically. In addition, since the correction material is cut by a part of the cutting blade, the load balance is poor, and the blade is chipped. Moreover, since it perforates in the peripheral part away from the center of the merging port, there is a possibility that the perforation position may be shifted due to expansion and contraction of the correction material even if it is a temporary hole.

  The present invention has been made in order to solve such problems. For example, the present invention enters an elongated pipe that cannot be entered by humans, and is rotated by a rotation around a perpendicular to a processing surface in the pipe. An object of the present invention is to provide an oscillation type rotating device capable of performing various processing operations such as a drilling operation.

  A swing type rotating device according to the present invention has a base body fixed to a flexible shaft and having a concave spherical surface at the front end, and a convex spherical surface slidable along the concave spherical surface of the base body at the rear end. A rotating work body connected to the front end of the flexible shaft via a universal joint and held at the front end of the swinging main body; provided on the outer periphery of the swinging main body; The concave spherical surface, the center of curvature of the convex spherical surface, and the rotational center of the universal joint coincide with each other.

  Further, in the present invention, a swing angle defining hole having a defining portion that increases in diameter toward the rear in the axial direction and defines a swing angle of the swing body is formed in a substantially central portion of the swing body. The base main body has a tapered surface that gradually decreases in diameter toward the rear in the axial direction at substantially the same angle as the swing angle, and has a tapered body that slides the slide cover on the tapered surface. It may be.

  Further, in the present invention, an escape spherical surface portion is provided behind the tapered body portion of the base main body so as to prevent the outer peripheral surface from being caught on the inner wall surface of the bent pipe line. May be.

  In the present invention, the flexible shaft is provided with a plurality of escape aids separately formed in a substantially spherical shape or a substantially truncated cone shape behind the escape spherical portion. The auxiliary tool may be formed to have a smaller diameter than the escape spherical portion adjacent to the front or another escape auxiliary tool adjacent to the front.

  Further, in the present invention, the swing type rotating device is a drilling device for drilling a correction material blocking a junction between a main pipe and a branch pipe, and the rotating working body can be drilled in the correction material. You may be comprised as a rotary working body for cutting provided with an appropriate cutting blade.

  According to the present invention, it is possible to perform various machining operations such as a drilling operation by entering a long and narrow pipeline that cannot be entered by humans and rotating around a perpendicular to the machining surface in the pipeline.

It is a perspective view showing one embodiment of a swing type rotating device according to the present invention. It is a front view which shows the swing type rotation apparatus of this embodiment. It is the 3A-3A sectional view taken on the line in FIG. It is the 4A-4A sectional view taken on the line in FIG. It is a use condition figure at the time of applying the swing type rotation device of this embodiment to a punching device. It is a perspective view which shows the universal joint in this embodiment. In this embodiment, it is a perspective view which shows the state which the rotary working body for cutting protruded. FIG. 4 is a cross-sectional view taken along line 4A-4A in FIG. 2 in a state in which a cutting rotary working body protrudes. In this embodiment, it is a figure which shows the state which the swing type rotation apparatus contact | abutted to the correction material. In this embodiment, it is a partial cross section figure which shows the state after a swing type rotation apparatus performed the swing operation | movement. In this embodiment, it is a partial cross section figure which shows the state which the oscillation type | mold rotation apparatus punched the temporary hole in the correction material. It is a figure which shows embodiment which applied the auxiliary tool for escape. It is a figure which shows the mode at the time of escaping the swing type rotation apparatus to which the auxiliary tool for escape is applied. It is a figure which shows the state which the perforation tool contacted diagonally with respect to the correction material.

  Hereinafter, an embodiment of a swing type rotating device 1 according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an oscillation type rotating device 1 of the present embodiment, and FIG. 2 is a front view thereof. 3 and 4 are sectional views taken along lines 3A-3A and 4A-4A in FIG.

  As shown in FIG. 5, the oscillating rotation device 1 of the present embodiment is a piercing device 1 for piercing from the side of the branch pipe E to the correction material L that closes the junction G of the main pipe H and the branch pipe E. As shown in FIGS. 1 to 4, the base main body 2 fixed mainly to the flexible shaft 6, the swing main body 3 provided in front of the base main body 2, and the swing main body 3 are applied. The cutting rotary work body 4 held at the front end of the cutting rotary body 4 and the slide cover 5 covering the outer periphery of the cutting rotary work body 4 are provided. Hereinafter, each of these components will be described.

  The base main body 2 is a portion that becomes the base of the swing type rotating device 1. In the present embodiment, the base body 2 is made of a high-strength synthetic resin or the like. As shown in FIGS. 3 and 4, the concave spherical surface 21 formed at the front end portion and the concave spherical surface 21 rearward. A tapered body 22 having a reduced diameter is provided, and an escape spherical part 23 provided behind the tapered body 22. Further, as shown in FIGS. 3 and 4, the base body 2 is formed with an insertion hole 24 through which the flexible shaft 6 is inserted along the axis, and the flexible shaft 6 inserted through the insertion hole 24 is bolted. It is fixed by a stopper 25.

  In the present invention, the flexible shaft 6 is configured to be flexible and includes any rotating shaft capable of transmitting a rotational force in an arbitrary direction. In the present embodiment, an inner shaft (not shown) as a power transmission shaft and an outer tube that covers the inner shaft are connected to a predetermined drive device D. Further, the flexible shaft 6 plays a role of transferring the rotational driving force to the oscillating rotating device 1 as well as taking the oscillating rotating device 1 into and out of the pipeline. Therefore, it has the length which can push the swing type rotation apparatus 1 to a desired work position.

  Further, the retainer 25 is configured to be engaged with the enlarged diameter portion 61 of the flexible shaft 6 as shown in FIGS. 3 and 4. As a result, the retainer 25 prevents the base shaft body 2 from coming off when pulling the flexible shaft 6 to cause the swinging rotation device 1 to escape from the pipe line.

  On the other hand, the swing body 3 is for causing the base body 2 to swing. In the present embodiment, the swing body 3 is made of a material such as aluminum, and as shown in FIGS. 3 and 4, a convex spherical surface 31 that slides along the concave spherical surface 21, and the swing body 3. A swing angle defining hole 32 that regulates the swing angle of the cutting member, a cam follower 33 that rolls in contact with the rear end surface of the cutting rotary working body 4, and a housing recess 34 that houses an end of a compression spring 53 to be described later. have. The swing body 3 is sandwiched between the concave spherical surface 21 of the base body 2 and the rear end surface of the cutting rotary work body 4 with the flexible shaft 6 inserted through the swing angle defining hole 32. Yes.

  In the above configuration, the concave spherical surface 21 and the convex spherical surface 31 control the swinging motion of the swinging main body 3 with respect to the base body 2 and transmit the pressing force from the flexible shaft 6 to the cutting rotary working body 4. To fulfill. Specifically, the concave spherical surface 21 is formed such that the front end portion of the base body 2 is a concave spherical surface. On the other hand, the convex spherical surface 31 is formed such that the rear end surface of the oscillation body 3 is a convex spherical surface. The concave spherical surface 21 and the convex spherical surface 31 are configured to have the same radius of curvature so as to be in sliding contact with each other, and the centers of curvature are substantially at the same position. As a result, the swing body 3 can swing in any direction around the universal joint 8.

  In the present embodiment, a foreign substance intrusion prevention plate 7 is held between the base main body 2 and the swing main body 3 as shown in FIGS. The foreign matter intrusion prevention plate 7 is formed so as to cover the opening on the rear side of the swing angle defining hole 32 with a material such as synthetic resin. For this reason, even when the swing body 3 moves to the maximum swing angle position, foreign matter can be prevented from entering the swing angle defining hole 32 from the outside.

  The swing angle defining hole 32 is for defining the range of the swing angle while freely determining the swing direction of the swing body 3. In this embodiment, as shown in FIGS. 3 and 4, the swing angle defining hole 32 is provided at a substantially central portion of the swing body 3 and has a tapered surface shape that gradually increases in diameter toward the rear in the axial direction. It has a portion 32a. When the swing body 3 is tilted to the maximum swing angle, the taper surface-shaped defining portion 32a is in contact with the flexible shaft 6 so that the maximum swing position is limited so that it does not tilt further. . The defining portion 32a is not limited to a tapered surface as in the present embodiment, and may be capable of defining the oscillation angle of the oscillation body 3 by contacting the flexible shaft 6. For example, a flange shape or a curved surface shape may be used.

  On the other hand, the tapered body portion 22 of the base body 2 has the cutting rotary work body 4 and the neck along the slide cover 5 regardless of the swing body 3 tilting to any swing angle within the specified range of the swing angle. The swing body 3 is slid to enable entry / exit. In the present embodiment, as shown in FIGS. 3 and 4, the tapered body portion 22 has a tapered surface 22 a that is gradually reduced in diameter toward the rear in the axial direction. The taper surface 22 a is formed at substantially the same angle as the swing angle defined by the defining portion 32 a of the swing angle defining hole 32, and slides the slide cover 5. In this embodiment, since the defining portion 32a is formed in a tapered surface shape, the taper angle of the defining portion 32a and the taper angle of the tapered body portion 22 are the same.

  The escape spherical portion 23 of the base main body 2 is prevented from being caught on the inner wall surface of the bent pipe line when the swing-type rotating device 1 that has entered the branch pipe E or the like is handed over, so that it can easily escape. belongs to. In the present embodiment, the escape spherical portion 23 has a spherical outer peripheral surface as shown in FIGS. The shape of the escape spherical portion 23 is not limited to the shape of the present embodiment as long as it has a spherical surface that prevents catching.

  The cam follower 33 of the oscillation body 3 is for smoothly rotating the cutting rotary work body 4 held on the front surface of the oscillation body 3. In the present embodiment, as shown in FIG. 3, the cam followers 33 are arranged at equal angular intervals in the circumferential direction on the front surface of the oscillation main body 3 so as to roll in contact with the rear end surface of the cutting rotary working body 4. One is provided. The arrangement and number of cam followers 33 are not limited to these and can be changed as appropriate.

  Next, the cutting rotating working body 4 is for cutting and drilling the correction material L. In this embodiment, since the swing type rotating device 1 is applied to the drilling device 1, the rotating working body 4 for cutting such as a hole saw is used as the rotating working body 4, but the rotating work according to various uses is used. The body 4 can be employed. In the present embodiment, the cutting rotary working body 4 is formed in a substantially cylindrical shape as shown in FIG. 1, and is provided with a cutting blade 41 that can be drilled in the correction material L along its front peripheral edge. Yes. On the other hand, as shown in FIG. 3 and FIG. 4, a disc portion 42 that abuts the cam follower 33 is provided at the rear peripheral portion, and a substantially frustoconical cylindrical connection is formed from the substantially central portion of the disc portion 42 toward the front. A portion 43 is formed to protrude.

  The connecting portion 43 is for connecting the cutting rotary working body 4 to the distal end portion of the flexible shaft 6 via the universal joint 8. Specifically, as shown in FIGS. 3 and 4, the connecting portion 43 has a substantially truncated cone-shaped cylindrical shape whose diameter is reduced toward the front in accordance with the taper angle of the defining portion 32 a of the swing angle defining hole 32. Is formed. And the other end part of the universal joint 8 by which one end part was connected to the front-end | tip of the flexible shaft 6 is being fixed to the front end side of this connection part 43. FIG.

  In this embodiment, as shown in FIG. 6, the universal joint 8 includes a first member 81 on the driving side fixed to the flexible shaft 6, a second member 82 on the driven side fixed to the connection portion 43, and these A top member 83 is provided for connecting the first member 81 and the second member 82 so as to be rotatable around rotation axes orthogonal to each other. The rotation center of the universal joint 8 corresponding to the intersection of these rotation axes is coincident with the curvature centers of the concave spherical surface 21 and the convex spherical surface 31. Thereby, the sliding operation of the concave spherical surface 21 and the convex spherical surface 31 and the rotating operation of the universal joint 8 are synchronized, and the swinging operation of the swing type rotating device 1 is realized.

  In the present embodiment, as shown in FIG. 1, the center drill 44 is fixed to the tip of the connection portion 43. The center drill 44 has a role of positioning a rotation center at the time of cutting by the cutting rotary working body 4 and a role of collecting cutting scraps cut out by cutting. In this embodiment, from the viewpoint of preventing the inner wall surface of the branch pipe E from being damaged, the tip position of the center drill 44 is attached so as not to protrude from the cutting rotary working body 4. The tip of the center drill 44 may be projected when the positioning function is given priority.

  The slide cover 5 is for covering the outer periphery of the cutting rotary working body 4. In the present embodiment, as shown in FIGS. 1, 3, and 4, the slide cover 5 is formed in a substantially cylindrical shape by a material such as a synthetic resin. Further, the outer peripheral surface of the slide cover 5 is formed in a substantially spherical shape, and a locking portion 51 for locking the oscillation main body 3 is provided on the front peripheral edge. In the present embodiment, as shown in FIG. 1, a retaining pin 35 is provided on the outer peripheral surface of the oscillation body 3, and a sliding groove 52 for sliding the retaining pin 35 along the axial direction. Is formed on the slide cover 5.

  On the other hand, as shown in FIG. 4, a plurality of accommodating recesses 34 that can accommodate the ends of the compression springs 53 are formed on the front surface of the oscillation body 3, and between these accommodating recesses 34 and the locking portions 51. A compression spring 53 is held on the surface. Thereby, the slide cover 5 is always urged | biased ahead, and the rotary working body 4 for cutting is protected. As will be described later, when the flexible shaft 6 is pushed in while holding the slide cover 5, the compression spring 53 is compressed and the cutting rotary working body 4 moves forward from the slide cover 5 as shown in FIGS. 7 and 8. It slides and protrudes.

  In the present embodiment, four compression springs 53 are arranged at equiangular intervals in the circumferential direction. However, the present invention is not limited to this configuration, and the cutting performance of the rotary working body 4 for cutting and the flexible shaft 6 are determined. Depending on the relationship with the pushing force, the number may be appropriately increased or decreased. For example, when the cutting performance is low or when a strong pushing force cannot be transmitted, the number of compression springs 53 may be reduced. Further, the magnitude of the elastic force of the compression spring 53 may be adjusted as appropriate.

  Next, the operation of the swing type rotating device 1 configured as the above-described punching device 1 will be described with reference to FIG. In the present embodiment, as shown in FIG. 5, an operation in the case where a temporary hole K is drilled from the branch pipe E side in the correction material L that blocks the junction G of the main pipe H and the branch pipe E will be described.

  First, as shown in FIG. 5, the operator causes the swinging rotary device 1 to enter the branch pipe E through a ground-side sewage tank or the like, and then sequentially sends the flexible shaft 6 forward. Thereby, the swing type rotating device 1 moves forward in the branch pipe E while being pushed by the flexible shaft 6. At this time, since the substantially spherical slide cover 5 covers the cutting rotary work body 4, the cutting rotary work body 4 is protected, and the frictional resistance with the branch pipe E is reduced and moved smoothly. Be made.

  When the swing type rotating device 1 reaches the junction G, the front surface of the slide cover 5 comes into contact with the correction material L blocking the junction G. At this time, when the branch pipe E is bent at a steep angle just before the junction G, the rotating shaft of the cutting rotating work body 4 is inclined with respect to the correction material L as shown in FIG. 9A. Touch. Therefore, if you try to cut in this state, the drilling position will deviate greatly from the center, you will not be able to drill properly, it will take longer drilling time, the hitting of the cutting blade will be bad, it will also cause damage End up.

  However, in this embodiment, by further pressing the flexible shaft 6, the cutting rotary working body 4 and the swing body 3 covered by the slide cover 5 perform a swing operation on the base body 2. At this time, in this embodiment, since the concave spherical surface 21 and the convex spherical surface 31 are slidably in contact with each other, the swinging operation is performed while transmitting the pushing force from the flexible shaft 6 to the swinging main body 3. Make it. In addition, since the rotation center of the universal joint 8 and the centers of curvature of the concave spherical surface 21 and the convex spherical surface 31 coincide with each other, the rotation operation of the universal joint 8 and the sliding of the concave spherical surface 21 and the convex spherical surface 31 are performed. The operation can be synchronized.

  9B, the rotating shaft of the cutting working body 4 for cutting is arranged in a substantially orthogonal state with respect to the correction material L, and the entire circumference of the cutting blade 41 contacts the correction material L. Further, the rotational axis of the cutting rotary working body 4 is disposed at the center of the junction G or in the vicinity thereof.

  In the present embodiment, as shown in FIG. 9B, the defining portion 32a of the swing angle defining hole 32 contacts the flexible shaft 6 to define the swing angle. For this reason, it is prevented that the rotation range of the universal joint 8 is exceeded. In the present embodiment, the foreign matter intrusion prevention plate 7 covers the opening on the rear side of the swing angle defining hole 32. For this reason, even when the swing body 3 is tilted to the position of the maximum swing angle, foreign matter is prevented from entering the swing angle defining hole 32.

  Subsequently, after causing the swing type rotating device 1 to swing, the operator operates the ground-side drive device D to drive the flexible shaft 6. At this time, the flexible shaft 6 transmits the rotational driving force from the driving device D to the first member 81 of the universal joint 8 even if it is bent in a complicated manner by the pipe line of the branch pipe E. The universal joint 8 transmits the rotational driving force from the first member 81 to the second member 82 at any swing angle, and rotates the cutting rotary working body 4 and the center drill 44. At this time, the cutting rotary working body 4 is smoothly rotated by the cam follower 33 provided on the front surface of the oscillation body 3.

  After starting the rotation of the cutting rotary work body 4 and the center drill 44, the flexible shaft 6 is further pushed in. Accordingly, as shown in FIG. 9C, the base body 2 fixed to the flexible shaft 6 pushes the oscillation body 3 and the cutting rotary work body 4 forward along the slide cover 5 while compressing the compression spring 53. . At this time, since the taper surface 22a of the tapered body portion 22 is coincident with the swing angle defined by the defining portion 32a, the base body 2 is attached to the slide cover 5 at any swing angle position. Slide operation is possible without hitting.

  Further, when the flexible shaft 6 is pushed in, the cutting material 4 is cut while the rotary working body 4 for cutting is rotated, and is punched into a substantially circular shape. As a result, a temporary hole K is drilled in the vicinity of the approximate center of the correction material L that has blocked the junction G. At this time, since the tip of the center drill 44 is pierced into the correction material L, the rotational center of the cutting rotary working body 4 is positioned, so that the rotational operation during cutting is stabilized. Further, in the present embodiment, at the same time as the cutting rotary working body 4 cuts out the cutting waste, the center drill 44 cuts out substantially the center of the cutting waste into a circular shape. For this reason, as shown in FIG. 9C, the cutting waste is penetrated and caught by the center drill 44, so that it does not fall into the pipeline.

  After the drilling of the temporary hole K is completed, the operator operates the driving device D to stop the rotation of the cutting rotary working body 4. Then, by pulling the flexible shaft 6, the swing type rotating device 1 is recovered from the inside of the pipeline. At this time, the slide cover 5 is automatically slid forward by the compression spring 53 to cover the cutting rotary working body 4. As a result, the swing type rotating device 1 exhibits the appearance of an image in which two large and small balls are combined by the slide cover 5 and the escape spherical portion 23. Therefore, the swing type rotating device 1 always comes into contact with the inner wall surface of the branch pipe E by the substantially arc-shaped outer peripheral surface, and therefore it is difficult to catch on the bent portion of the branch pipe E and the like, and the escape property is good.

  In this embodiment, since the base main body 2 is firmly fixed to the flexible shaft 6 by the retaining member 25, even if the operator pulls with a strong force, the flexible shaft 6 is completely pulled out, and the neck It is possible to avoid the trouble of placing the vibration type rotating device 1 in the pipeline.

  After pulling up the swing type rotating device 1 to the ground, the cutting waste caught on the center drill 44 may be taken out. At this time, in this embodiment, as shown in FIG. 7, four scraped holes 45 are formed along the outer peripheral surface of the cutting rotary working body 4. For this reason, cutting scraps can be easily scraped by inserting a predetermined jig through the scraping hole 45.

According to the present embodiment as described above, the following effects can be obtained.
1. A temporary hole K can be drilled in the straightening material L that enters the branch pipe E where a human cannot enter and closes the junction G between the main pipe H and the branch pipe E.
2. Since the rotating shaft of the cutting rotary working body 4 is oriented in a direction substantially perpendicular to the correction material L, damage to the cutting blade can be prevented and the drilling time can be shortened.
3. Even if the vicinity of the junction G is a bent pipe, the temporary hole K can be drilled at a substantially central position of the junction G, so that it is possible to suppress the displacement of the correction material L from the junction G.
4). The escape performance when pulling out from a bent pipe line can be improved.

  The swing type rotating device 1 according to the present invention is not limited to the above-described embodiment, and can be appropriately changed.

  For example, in the present embodiment described above, the swing type rotating device 1 when applied to the punching device 1 has been described. However, the present invention is not limited to this configuration, and the processing surface in the pipeline that cannot be entered by humans is used. On the other hand, the present invention can be applied to any device that performs work involving rotational motion.

  Specifically, in this embodiment described above, if a cleaning rotary working body having a cleaning tool is provided on the front end surface instead of the cutting rotary working body 4, the cleaning for cleaning the inner wall surface in the pipe line is performed. It can be configured as a device. According to this cleaning device, the cleaning performance can be improved because the cleaning surface can be rotated and cleaned while the cleaning surface is in close contact with the inner wall surface of the pipe. In addition, it can be used for various purposes by applying a rotating work body according to various purposes.

  Moreover, in this embodiment mentioned above, the escape performance from the inside of a pipe line is improved by providing the escape spherical part 23 behind the base body 2. However, as shown in FIG. 10, a plurality of escape aids 9 may be separately provided on the flexible shaft 6 from the escape spherical portion 23 to the rear. In the present embodiment, the rearmost escape assisting tool 9 is formed in a substantially truncated cone shape tapered rearward. On the other hand, the other escape aids 9 are formed in a substantially spherical shape. Each of the escape aids 9 is formed with a smaller diameter than the escape spherical portion 23 adjacent to the front or another escape aid 9 adjacent to the front. In other words, the escape assisting tool 9 having a small diameter is gradually provided from the swinging rotation device 1 to the rear.

  When pulling up the oscillating rotary device 1 provided with the above-described escape aid 9, first, as shown in FIG. 11, the escape aid 9 provided at the rearmost portion comes into contact with the corner of the curved pipe. If the flexible shaft 6 is pulled in this state, the escape assisting tool 9 smoothly gets over the corners by the tapered surface of the minimum diameter. After that, the other escape aids 9 successively come into contact with the inner wall surface of the pipe line, and the flexible shaft 6 is floated so as to gradually move away from the inner wall surface of the pipe line. Thereby, since the direction of the flexible shaft 6 is gently inclined with respect to the tensile direction, a larger tensile force is transmitted and the escape performance is improved. Moreover, in this embodiment, since each escape aid 9 contacts the inner wall surface of the pipeline, the insertability when inserting into the pipeline is also improved.

  In the above example, the last escape assisting tool 9 has a substantially truncated cone shape, and the other escape assisting tool 9 is formed in a substantially spherical shape, but is not limited to this configuration. Each escape aid 9 only needs to be formed in a substantially spherical shape or a substantially truncated cone shape.

1 Swing type rotation device (perforation device)
2 Base body 3 Swing body 4 Rotating working body (Rotating working body for cutting)
DESCRIPTION OF SYMBOLS 5 Slide cover 6 Flexible shaft 7 Foreign material intrusion prevention plate 8 Universal joint 9 Escape aid 21 Concave spherical surface 22 Tapered trunk | drum 22a Tapered surface 23 Escape spherical part 24 Insertion hole 25 Retaining tool 31 Convex spherical surface 32 Swing angle Defined hole 32a Defined portion 33 Cam follower 34 Receiving recess 35 Retaining pin 41 Cutting blade 42 Disc portion 43 Connection portion 44 Center drill 45 Scraping hole 51 Locking portion 52 Sliding groove 53 Compression spring 61 Expanded portion 81 First member 82 First member 82 2 members 83 Frame members D Drive device H Main pipe E Branch pipe G Junction port K Temporary hole L Repair material

Claims (5)

A base body fixed to the flexible shaft and having a concave spherical surface at the front end;
A swinging body having a convex spherical surface slidable along the concave spherical surface of the base body at the rear end;
A rotating working body connected to the front end of the flexible shaft via a universal joint and held on the front end of the main swinging body,
A slide cover that is provided on an outer periphery of the oscillation main body and is slidable along a rotation axis direction of the rotary working body;
A swing type rotation device in which the centers of curvature of the concave spherical surface and the convex spherical surface coincide with the rotation center of the universal joint.   In Claim 1, a swing angle defining hole is provided in a substantially central portion of the swing main body, the diameter of the swing main body being increased toward the rear in the axial direction and having a defining portion for defining a swing angle of the swing main body. The base body has a tapered surface that gradually decreases in diameter toward the rear in the axial direction at substantially the same angle as the swing angle, and has a tapered body that slides the slide cover on the tapered surface. The swing type rotating device.   3. The escape spherical portion according to claim 1 or 2, wherein an outer peripheral surface is formed in a spherical shape behind the tapered body portion of the base body, and is prevented from being caught by an inner wall surface of a bent pipe line. A swing type rotation device provided.   4. The escape shaft according to claim 3, wherein a plurality of escape aids each having a substantially spherical shape or a substantially truncated cone shape are separately provided on the flexible shaft behind the escape spherical portion. The tool is an oscillating rotation device that has a smaller diameter than the escape spherical portion adjacent to the front or another escape assisting tool adjacent to the front.   5. The oscillating rotation device according to claim 1, wherein the swinging rotation device is a punching device that punches a correction material that closes a junction of a main pipe and a branch pipe, and the rotating working body includes: An oscillation-type rotation device configured as a rotary working body for cutting provided with a cutting blade capable of drilling in the correction material.

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