JPH0919815A - Band-shaped chip removing cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutter which permits removal of band-shaped chip from an opening bored in a main pipe by a hot tap process. SOLUTION: A cutter edge 2 furnished at the bottom of a cylindrical cutter body 1, and a grinding stone 12 is installed near the bottom of the cutter edge 2 in such a way as protruding aside from an outer side face 5 of the cutter edge 2, wherein the grinding stone 12 is arranged as intruded inward against resilient force of a spring 17 and pushed out by repulsive force of the spring 17. Thus a chip removing cuter for boring pipe is achieved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutter capable of removing strip-shaped chips generated when a main pipe is bored from the main pipe by a hot tap method or the like.

[0002]

2. Description of the Related Art The conventionally known hot tap construction method is a construction method capable of branching out a branch pipe from the main pipe and shutting off the main pipe without lowering the pressure of the fluid flowing in the main pipe.

This construction method is carried out as follows.
That is, the fitting 51 including the upper fitting 52 and the lower fitting 53 shown in FIG.
As shown in FIG. 5, the main pipe 50 is brought into contact with the main pipe 50 so as to cover the main pipe 50.

Then, the fitting 51 is connected to the main pipe 5.
It is hermetically attached to 0. Next, the gate valve 59 shown in FIG. 7 is placed on the flange of the upper fitting 52, and the gate valve 59 is connected by a bolt and assembled.

Then, the perforator 65 shown in FIG. 7 is assembled on the gate valve 59 by bolts. Next, the handle 60 of the gate valve 59 is rotated to open the gate valve 59.

When the cutter 66 of the perforator 65 is lowered while being rotated by the drive shaft 68, the cutter 66
Perforates the upper part of the main pipe 50 as shown in FIG. When the perforation of the upper part of the main pipe 50 is completed, the rotation of the cutter 66 is stopped, the cutter 66 is pulled up and collected inside the perforator 65, the gate valve 59 is closed, and the perforator 65 is closed by the gate valve 59. Remove more.

Then, if necessary, the chips in the main pipe 50 are removed by a known device (not shown). Next, on the gate valve 59, the stopping machine 7 shown in FIG.
3 is attached with the stopper 74 built in the stopping machine 73, and the gate valve 59 is opened.

The stopping machine 73 is
A stopper 74 shown in FIG. 8 is attached to the lower end of a center shaft 75 slidably provided in the stopping machine 73, and the stopper 74 is located at an upper position incorporated in the stopping machine 73. It is formed so that it can be moved to the lowered position shown in FIG.

The stopper 74 is provided with a head 76 attached to the lower end of the central shaft 75 as shown in FIG. 8. The head 76 is formed in a plate shape, and is formed in a plate shape in the central portion. One end of the yoke 77 is pivotally attached by a pin 78. And, the lower part of the head 76 is
When the yoke 77 rotates, a rubber cup 79, which will be described later, is notched obliquely so as not to be caught in the lower portion of the head 76.

Then, the yoke 77 and the roller mounting portion 8
Between 0, a rubber cup 79 formed in a thick disk shape
Are integrally coupled to each other, and at the tip of the roller mounting portion 80,
A roller 81 is rotatably provided.

Further, the head 76 is provided with a stop portion (not shown), and the side portion of the yoke 77 abuts on this stop portion, so that the yoke 77 is moved relative to the head 76 as shown in FIG. In addition, it is formed so that it is not vertical but is inclined to one side and stopped.

From the outside, the stopping machine 73
By operating the central shaft 75 of the head 7, as shown in FIG.
In a state where the yoke 77 is slightly inclined and droops from 6,
When the stopper 74 is lowered, the roller 81 comes into contact with the inner bottom surface of the main pipe 50.

Then, when the central shaft 75 is further lowered, the yoke 77 is rotated around the pin 78, and the rubber cup 79 is located near the position shown in FIG. Move in the direction to close the inner surface of.

The rubber cup 79 is connected to the main pipe 50.
The outer diameter is larger than the inner diameter of the. When the central shaft 75 is further lowered, the tip of the head 76 comes into contact with the inner bottom surface of the main pipe 50, and the rubber cup 79 hermetically closes the entire inner surface of the main pipe 50. With this, the flow in the main pipe 50 is stopped, and the work of shutting off the main pipe 50 is completed.

As shown in FIG. 10, if the shut-off construction sites are provided at two separate locations on the main pipe 50, the flow of the main pipe 50 between the construction sites is stopped. Then, branching work, replacement work, etc. of the main pipe 50 can be performed at a position between the construction points.

After the branching work is completed,
If the central shaft 75 of the stopping machine 73 is raised to separate the rubber cup 79 from the inner surface of the main pipe 50, the flow in the main pipe 50 is restored.

Then, the stopper 74 is pulled up into the stopping machine 73 to collect it, the gate valve 59 is closed, and the stopping machine 73 is removed from the gate valve 59. Further, although not shown, a publicly known plug tightening machine is attached to the gate valve 59, and the upper fitting 5
The gate valve 59 can be removed by attaching the plug to 2, and the construction is completed without leaking the fluid inside the main pipe 50.

[0018]

In drilling the main pipe 50 by the hot tap method, the cutter 66 has an outer diameter smaller than the inner diameter of the main pipe 50 as shown in FIG. 11 (b). To do. This is because in the perforation of the main pipe 50, only the upper portion of the main pipe 50 is opened.

For this reason, when the main pipe 50 is perforated, after the perforation is completed, the strip chips 86 may remain connected to the perforated inner surface of the main pipe 50 as shown in FIG. 11 (a). .

This strip-shaped chip 86 has the same width as the blade edge 67 of the cutter 66, a thickness of about 0.2 mm, and a length of
When the diameter of the main pipe 50 is 400 mm, it has a length of about 30 mm.

As shown in FIGS. 12 (a), 12 (b) and 12 (c), the blade tip 67 of the cutter 66 cuts the upper portion of the main pipe 50 to generate the strip chips 86, and the inner surface of the main pipe 50 is cut. When the thickness of the portion to be cut becomes thin at the time of finally cutting up, the portion to be cut is pressed by the cutting edge 67 and bends, and as shown in FIG. To do.

As shown in FIG. 13, the band-shaped chips 86 are generated while remaining attached to the last cut portion of the perforated opening. In the subsequent step, the stopping machine 73 When shutting off the inside of the main pipe 50, it becomes a cause of causing a defect in the shut-off performance.

That is, when the stopper 74 of the stopping machine 73 descends and the rubber cup 79 is inserted in close contact with the inner surface of the main pipe 50, the outer diameter of the rubber cup 79 is larger than the inner diameter of the main pipe 50. In order to remove the band-shaped chips 86 attached to the perforated opening of the main pipe 50 from the rubber cup 79,
14, the strip-shaped chips 86 are present between the inner surface of the main pipe 50 and the rubber cup 79 as shown in FIG. 14, and the fluid in the main pipe 50 cannot be completely shut off.

The present invention has been made in view of the above matters, and an object of the present invention is to provide a cutter capable of removing strip-shaped chips from an opening portion when a main pipe is bored by a hot tap method or the like. To do.

[0025]

According to a first aspect of the present invention, a large number of cutting blades 2 projecting downward are provided in a lower portion of a cylindrical cutter body 1, and at least a part of the cutting blades 2 is provided.
A grindstone 12 that protrudes laterally from the outer surface 5 of the cutting blade 2 is provided near the lower end of the cutting blade 2. The grindstone 12 resists the elastic force of the spring 17 that supports the grindstone 12 and the radius of the cutter body 1. It was formed so as to be pushed inward in the direction and extruded outward in the radial direction of the cutter body 1 by the elastic force of the spring 17 to form a band-shaped chip removing cutter.

A second aspect of the present invention is a strip-shaped chip removing cutter according to the first aspect of the present invention, which is provided with a grinding body formed of steel having a hardness higher than that of a pipe to be drilled, instead of the grindstone 12.

Also in the strip-shaped chip removing cutter of the present invention, when the main blade 50 is pierced by the cutting blade 2 of the cutter body 1, the cutting blade 2 penetrates the main tube 50 and finally cuts the inner surface of the main tube 50. When moving up (when the cutting blade 2 reaches the same position as the position shown by the dotted line in FIG. 11B), FIG.
Similar to the perforation by the cutter 66 shown in (c), the thickness of the cut portion becomes thin.

Then, the thinned cut portion is pressed by the cutting edge and bends to become a band-shaped chip without being cut completely.
The strip chips may remain connected to the perforated inner surface of the main tube 50.

Then, the cutter body 1 of the present invention is
Of the cutting blades 2, at least a part of the cutting blades 2 near the lower end portion thereof, the grindstone 1 protruding laterally from the outer surface 5 of the cutting blades 2.
2 or a grinding body is provided, like the cutting edge 67 of the cutter 66 shown in FIG. 12C, when the cutting blade 2 having the main pipe 50 further descends, the outer surface of the cutting blade 2 is lowered. The grindstone 12 protruding laterally from 5 or the grinding body is the main pipe 5
On the inside of the hole 0, the band-shaped chips remaining without being cut off are ground and removed.

That is, more specifically, in the grindstone 12 or the grinding body, the front part (the tip 15 side) of the grindstone 12 or the grinding body contacts the inner surface of the perforated portion of the main pipe 50. In this case, the front portion is pushed by the inner surface of the punched portion, the central portion of the spring 17 is pushed inward, and the spring 17 is pushed into the hole 3 for inserting a grindstone or the like.

Then, the grindstone 12 or the tip portion 15 of the grinding body
However, when it comes off from the inner surface of the perforated portion of the main pipe 50 and goes downward, the grindstone 12 or the grinding body is pushed by the spring 17 and protrudes laterally from the outer surface 5 of the cutting blade 2, and thereby the main pipe 50. The remaining band-shaped chips are ground and removed by connecting to the inner surface of the perforated part of the.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 3 are diagrams for explaining an embodiment of the present invention.

The cutter body 1 of the band-shaped chip removing cutter of this embodiment is made of high-speed tool steel, is formed in a cylindrical shape, and has a drive shaft 6 standing upright at the center of the upper end. In the lower portion of the cutter body 1, a large number of cutting blades 2 projecting downward are provided at equal intervals on the circumference, as in the case of a conventionally known cutter.

Of the cutting blades 2, half of the cutting blades 2, that is, every other cutting blade 2, is provided with a grindstone 12 near the lower end. Further, the grindstone 12 can be provided only on a part of the cutting blades 2 or on all the cutting blades 2.

Then, the grindstone 12 is attached by inserting the circular grindstone or the like insertion hole 3 near the lower end of the cutting blade 2 into the cutting blade 2.
Is formed so as to penetrate from the outer surface 5 to the inner side surface of the cutting blade 2, and the grindstone 12 is fitted into the grindstone or the like fitting hole 3. Blade 2
An annular groove 4 is provided at a position near the inner surface of the.

The grindstone 12 fitted in the grindstone fitting hole 3
As shown in FIG. 3 (c), a circular fixed shaft 13 made of steel with a conical tip is formed, and the conical portion of the fixed shaft 13 and the surface of the circular portion are formed. Further, the grindstone particles 14 are adhered and attached.

The fixed shaft 13 is provided with a small-diameter mounting shaft 16 projecting to the side opposite to the tip 15 of the grindstone 12, and the mounting shaft 16 has a spring 17 for supporting the grindstone 12.
Is attached and provided.

The spring 17 is made of spring steel and is formed in an elongated plate shape, and the grindstone 12 is formed in a hole provided at the center thereof.
The mounting shaft 16 is inserted and welded and fixed. The spring 17 is formed in an arc-shaped portion 18 whose tip portion is formed in an arc shape having substantially the same radius as the arc of the annular groove 4 provided in the cutting blade 2, and the tip portion of the spring 17 is ,
It is curved so as to project to the side opposite to the fixed shaft 13.

The arcuate portions 18 at both ends of the spring 17 are
The linear distance between 18 is slightly smaller than the diameter of the annular groove 4 and larger than the inner diameter of the fitting hole 3. Then, the grindstone 12 is fitted in the grindstone or the like fitting hole 3 and the spring 17 provided in the grindstone 12 is fitted in the annular groove 4 provided in the grindstone or the like fitting hole 3 and attached to the cutting blade 2. There is.

The grindstone 12 is provided so that the tip portion 15 projects laterally from the outer surface 5 of the cutting blade 2. Further, the grindstone 12 is the tip portion 1 of the grindstone 12.
The spring 17 supporting the grindstone 12 by pressing 5
It is formed so as to be pushed inward in the radial direction of the cutter body 1 against the elastic force of.

Further, the grindstone 12 is formed so as to be pushed outward in the radial direction of the cutter body 1 by the elastic force of the spring 17. In the strip-shaped chip removing cutter of this embodiment, the main blade 50 is perforated by the cutting blade 2 of the cutter body 1, and when the grindstone 12 reaches the perforated portion of the main tube 50, first, the conical portion of the grindstone 12 is cut. The main part 50
Abutting the perforated part of.

When the cutting by the cutting blade 2 progresses and the cutting blade 2 descends, the grindstone 12 has a main portion near the middle portion of the conical portion and further near the tip portion 15 of the conical portion. Move to abut the perforated portion of 50.

Then, the grindstone 12 moves with its movement.
While pushing the central portion of the spring 17 inward, the spring 17 is gradually pushed into the hole 3 for inserting a grindstone or the like, and the grindstone 12 moves without being caught by the end of the perforated portion of the main pipe 50.

When the upper edge of the main pipe 50 is pierced by the cutting blade 2 and the cutting blade 2 penetrates the entire upper surface of the main pipe 50 and finally cuts up the inner surface of the upper surface of the main pipe 50 (see FIG. 11). When the cutting blade 2 reaches the same position as the position shown by the dotted line in (b)), the thickness of the cut portion becomes thin, as in the case of punching by the cutter 66 shown in (c) of FIG.

Then, the thinned cut portion is pushed by the cutting edge and bends to become strip-shaped chips without being cut completely.
This band-shaped chip remains connected to the perforated inner surface of the main pipe 50.

Then, the cutting blade 2 is further lowered and the grindstone 1
When the front part of 2 is disengaged from the perforated inner surface of the main pipe 50, the grindstone 12 is pushed by the spring 17 and projects laterally from the outer surface 5 of the cutting blade 2.

When the grindstone 12 perforates the main pipe 50, the band-shaped chips remaining without being completely cut are ground and removed inside the perforations. Then, the strip-shaped chips removed as described above fall to the inner bottom portion of the main pipe 50.

Therefore, after punching the main pipe 50, the cutter body 1 is pulled up into the punching machine 65, the gate valve 59 is closed, and the punching machine 65 is removed from the gate valve 59. Then, to the gate valve 59, a magnet for removing chips and band-shaped chips and a conventionally known removing device for chips and the like having a viewing window are attached to remove the chips and the like.

Therefore, after the main pipe 50 is bored by the hot tap method, the main pipe 50 is stopped by the stopping machine 7.
When closing with the stopper 74 of No. 3, the closing rubber cup 79 provided in the stopper 74 is not likely to be damaged by the band-shaped chips remaining inside the perforation of the main pipe 50.

Further, the main blade 5 is cut by the cutting blade 2 of the cutter body 1.
After drilling 0, the grindstone 12 or the grinding body makes contact with and slides on the inside of this hole, so that the inside of the main tube 50, which has been drilled, is in a polished state and becomes smooth.

Therefore, the rubber cup 79 is provided in the main pipe 50.
When inserting the rubber cup 79, there is no risk that the rubber cup 79 will be damaged by the bored inner surface of the main pipe 50.
9 also improves the sealing performance.

FIG. 4 shows another embodiment.
In this embodiment, one cutting blade 2 is provided with a plurality of grindstones 1.
2 is provided. Further, as an embodiment of the second invention, there is an embodiment not shown.

This embodiment has substantially the same structure as the band-shaped chip removing cutter shown in FIGS.
The configuration different from that shown in FIGS. 1 to 3 is the fixed shaft 13
While the grindstone particles 14 are adhered and adhered to the surface of the whetstone 12 to form the grindstone 12, in the embodiment of the second invention, a portion corresponding to the grindstone 12 is defined by JIS G 44.
No. 03 high-speed tool steel.

Further, the grinding body formed of high speed tool steel can be formed at low cost and is less likely to be chipped even when it collides with another object.

[0055]

According to the present invention, a grindstone 12 or a grinding body protruding laterally from the outer surface 5 of the cutting blade 2 is provided near the lower end of the cutting blade 2, and the grindstone 12 is supported by a spring 17. It is a thing.

Therefore, when the main pipe 50 is perforated by the cutter body 1, the band-shaped chips remaining inside the perforations that cannot be completely cut can be removed by the grindstone 12 or the grinding body.

Therefore, when the main pipe 50 is closed by the stopper 74 of the stopping machine 73 after the upper portion of the main pipe 50 is perforated by the hot tap method, the stopper 74
There is no possibility that the closing rubber cup 79 provided in the above may be damaged by the band-shaped chips remaining inside the perforations of the main pipe 50.

Further, the main body 5 is cut by the cutting blade 2 of the cutter body 1.
After the hole 0 is drilled, the grindstone 12 or the grinding body makes contact with and slides on the inside of the hole, so that the inside of the hole of the main pipe 50 is polished and becomes smooth.

Therefore, the rubber cup 79 is provided in the main pipe 50.
When inserting the rubber cup 79, there is no risk that the rubber cup 79 will be damaged by the bored inner surface of the main pipe 50.
9 also improves the sealing performance.

[Brief description of the drawings]

FIG. 1 is a front view of a cutter body according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part of a cutter body according to an embodiment of the present invention, which is an enlarged cross-sectional view of only a cutting blade taken along line AA of FIG.

FIG. 3 is an enlarged view of a grindstone according to an embodiment of the present invention, in which (a) and (b) are perspective views and (c) is a sectional view.

FIG. 4 is an enlarged view of a cutting blade according to another embodiment of the present invention.

FIG. 5 is a perspective view of a fitting used in a conventionally known means.

FIG. 6 is a perspective view of a main pipe fitted with a fitting, which is used in conventionally known means.

FIG. 7 is a partially cutaway view showing a mounting state of a punching machine used in a conventionally known means.

FIG. 8 is a side view of a stopper used in a conventionally known means.

FIG. 9 is a partially cutaway view showing a mounting state of a stopping machine used in a conventionally known means.

FIG. 10 is a partially cutaway view showing a state in which a stopping machine is mounted in two places, which is used in a conventionally known means.

FIG. 11 is a partially cross-sectional view showing a perforated state of a main pipe by a conventionally known means, in which (a) is a side view,
(B) is a front view of the main part

FIG. 12 is an enlarged cross-sectional view showing a main part of a perforated state of a main pipe in the order of (a), (b) and (c) by a conventionally known means.

FIG. 13 is a sectional view of a main pipe pierced by conventionally known means.

FIG. 14 is a partial cross-sectional view showing a state in which a stopper is attached to a main pipe pierced by a conventionally known means, with a part thereof omitted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cutter main body 2 Cutting blade 3 Insertion hole for grindstones 4 Annular groove 5 Outer surface 6 Drive shaft 12 Grindstone 13 Fixed shaft 14 Grindstone particles 15 Tip part 16 Mounting shaft 17 Spring 18 Arc part 51 Fitting 52 Upper fitting 53 Lower fitting 54 Welding 59 Gate valve 60 Handle 65 Drilling machine 66 Cutter 67 Cutting edge 68 Drive shaft 73 Stopping machine 74 Stopper 75 Center shaft 76 Head 77 Yoke 78 pins 79 Rubber cup 80 Roller mounting part 81 Roller 86 Band-like chips

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Minor Nemoto 88 Ono-cho, Tsurumi-ku, Yokohama-shi, Kanagawa Japan Steel Pipe Construction Co., Ltd. (72) Kaho Uchida 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Japan Inside Steel Pipe Co., Ltd. (72) Inventor Hideo Miyata 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Inside Nihon Steel Pipe Co., Ltd.

Claims (2)

[Claims] 1. A cylindrical cutter body 1 is provided with a large number of cutting blades 2 projecting downward at a lower portion thereof, and at least a part of the cutting blades 2 is provided near the lower end portion of the cutting blades 2. A whetstone 12 that projects laterally from the outer surface 5 is provided, and the whetstone 12 is pushed inward in the radial direction of the cutter body 1 against the elastic force of the spring 17 that supports the whetstone 12, and A band-shaped chip removing cutter formed so as to be pushed outward in the radial direction of the cutter body 1 by an elastic force. 2. The band-shaped chip removing cutter according to claim 1, comprising, instead of the grindstone 12, a grinding body made of steel having a hardness higher than that of a pipe to be drilled.