JP2555997Y2 - Cut piece stopper device for pipe drilling machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a stopper capable of collecting cut pieces generated when a main pipe is drilled by a cutter of a pipe drilling machine in a blocking method in a hot tapping method or a connection of a branch pipe having a different diameter. Related to the device.

[0002]

2. Description of the Related Art As shown in FIG. 15 and FIG.
Upper fitting 52 and lower fitting 53
Are welded with a butt weld 55 and a fillet weld 56 to attach the fitting 51 to the closed structure. And, in the lower fitting 53, a concave portion 54 is provided at the center,
The opening / closing mechanism of the stopping machine can be mounted, and a swarf generated when the main pipe 38 is pierced is formed.

The upper fitting 52 is provided with a flange, and a female screw is provided inside the flange. As shown in FIG. 17, a gate valve 61 is attached to the flange of the upper fitting 52 with bolts, and the pipe drilling machine 1 is attached to the flange of the gate valve 61 with bolts.

[0004] Then, the gate valve 61 is opened, the cutter 3 of the pipe drilling machine 1 is lowered, and a hole 40 is opened in the main pipe 38 with the pilot drill 6, and then the main pipe 38 is pierced with the cutter 3 and opened. The part 43 (FIG. 19) is formed.

At this time, the outer diameter of the cutter 3 is
, And larger than the inner diameter of the main pipe 38,
If the thickness of the cutter 3 is larger than the thickness of the main pipe 38,
The cut piece 39 has a shape divided into two as shown in FIG. 18, and the main pipe 38 is perforated as shown in FIG.

When the outer diameter of the cutter 3 is larger than the outer diameter of the main pipe 38, the cut pieces 39 of the main pipe 38 become integrally continuous, and the opening 43 of the main pipe 38 is substantially formed as shown in FIG.
It becomes as shown in.

After the cutting of the main pipe 38 is completed, the cut piece 39 is held inside the cutter 3 by the stop pin 67 of the pilot drill 6, and the cutter 3 is pulled up without dropping the cut piece 39.

Next, the gate valve 61 is closed, the pipe drilling machine 1 is removed from the gate valve 61, and the opening 4
3. Opening / closing mechanism of the above-mentioned stopping machine
27244) and the flow in the main pipe 38 is shut off.

[0009] Then, when the construction is progressed and shut-off becomes unnecessary, the opening / closing mechanism is contracted and returned into the stopping machine, the gate valve 61 is closed, the stopping machine is removed, and the plug 77 is attached to the center shaft 76. (Fig. 2
0) Attach the plug tightening machine 75 to the gate valve 61, open the gate valve 61, lower the central shaft 76 of the plug tightening machine 75, and attach the plug 77 to the upper fitting 5
2 and sealed (FIG. 19).

As described above, the above operation is performed by opening and closing the gate valve 61 to prevent the fluid in the main pipe 38 from being released into the atmosphere. It can be constructed without depressurizing while passing through the flow.

As described above, the stop pin 67 (FIG. 17) provided on the pilot drill 6 provided on the cutter 3 of the conventional pipe drilling machine 1 used for the shut-off method, as shown in FIGS. A horizontal through-hole 65 is provided near the tip of the pilot drill 6, and a stop pin 67 is slidably inserted into the through-hole 65.

A spring 69 is inserted on the rear side of the stop pin 67, and the spring 69 is pressed by a set screw 70 screwed to the rear of the through hole 65. The shoulder provided near the tip is pushed by the spring 69 so that the shoulder 6 of the through hole 65 is formed.
6 and a hemispherical portion 68 at the tip of the stop pin 67.
Are formed so as to protrude from the outer surface of the pilot drill 6.

After drilling a hole 40 in the main pipe 38 with the pilot drill 6, an opening 43 is formed in the main pipe 38 with the cutter 3.
During the drilling of the hole, the stop pin 67 is
Is reached, the hemispherical portion 68 of the stop pin 67
0 is pressed by the corner 41 to compress the spring 69,
Retreating into the through hole 65 (FIG. 22), the stop pin 6
7 passes through hole 40 (FIG. 23).

When the main pipe 38 is completely pierced by the cutter 3, the cut pieces 39 having entered the inside of the cutter 3 are caught by the tip of the stop pin 67 and collected together with the pipe piercing machine 1.

The connection of the branch pipes having different diameters in the hot tapping method is performed by connecting the branch pipe 86 having a small diameter to the main pipe 38 without lowering the pressure in the main pipe 38 and without stopping the flow.
That is, as shown in FIG.
After welding one main pipe portion 84, a branch pipe 86 is welded and connected to the branch portion 85, a seal fitting 90 is welded to the other main pipe portion 84, and the gate valve 61 is bolted to the flange of the seal fitting 90. Attach by

Next, as shown in FIG. 26, the pipe drilling machine 1 is attached to the flange of the gate valve 61, the gate valve 61 is opened, and an opening is formed in the main pipe 38 in the same manner as in the shut-off method in the hot tap method. 43, the cut piece 39 is held and housed in the cutter 3 by the stop pin 67 (FIG. 27), the gate valve 61 is closed, and the pipe drilling machine 1 is closed.
Remove.

Next, the plug tightening machine 7 is connected to the gate valve 61.
5 is attached, and a plug 77 attached to a central shaft 76 of a plug tightening machine 75 (FIG. 28) is screwed to a seal fitting 90 to seal the other main pipe portion 84 of the T-tube 83.

[0018]

The stop pin 67 provided on the conventional pilot drill 6 is provided with a hole 4 of the main pipe 38.
The hemispherical part 68 formed at the tip part abuts on the corner 41 of the 0, and the hemispherical part 68 is pushed in the axial direction of the stop pin 67 by a cam action to compress the spring 69 and the stop pin 67 penetrates. It retreats into the hole 65. The center point 0 of the hemispherical portion 68 is provided inside the outer surface of the pilot drill 6 (FIG. 24).

Therefore, if the spring 69 is made to have a low repulsive force, when the hemispherical portion 68 is pressed by the corner portion 41 of the hole 40 when the cut piece 39 is held, the stop pin 6
7 easily retreats and cannot hold the cut piece 39.

When the spring 69 has a strong repulsive force, the pilot hole 6 is used to insert the hole 4 into the main pipe 38.
When the hemispherical part 68 passes through the hole 40 while drilling the opening 43 in the main pipe 38 with the cutter 3 after drilling the hole 0, the hemispherical part 68 strongly contacts the corner 41 of the hole 40, The corner 41 of 40 is rounded as shown in FIG.

As a result, the hemispherical portion 68 of the stop pin 67 gets caught in the hole 40 of the cut piece 39 poorly, making it difficult to hold the cut piece 39. As described above, the conventional stop pin 67 cannot hold the cut piece 39 unless the spring 69 is adjusted to an appropriate repulsion force.
And the adjustment was difficult.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a cutting piece stopper device for a pipe drilling machine capable of securely holding a cutting piece of a main pipe, and a cutting piece stopper device for cutting chips.
The cut piece stopper device moves smoothly, preventing entry into the device.
Is a technical issue.

[0023]

According to a first aspect of the present invention, a vertical groove 7 is provided on an outer peripheral surface of a tip portion of a pilot drill 6 provided on a cutter 3 of a pipe drilling machine 1, and a lower portion of the groove 7 is provided. Groove 7
The lower part of the arm 20 that fits inside is rotatably mounted on a shaft. The arm 20 is urged by a spring 34 in a direction in which the upper part of the arm 20 projects outward from the groove 7, and the upper part of the arm 20 is At a position protruding from the groove 7, the arm 20 is formed so as to abut on the pilot drill 6 to stop the rotation , and the upper surface 21 of the arm 20 is formed into an arc-shaped surface.
The arm 20 is rotated and the pilot drill 6 is formed.
At the position where it abuts and stops, after the upper surface 21 of the arm 20.
Shape so that it is below the front end 9 of the ceiling scene 8 of the groove 7
This was used as a cut piece stopper device for a pipe drilling machine.

[0024]

[0025]

In the second invention , the front end portion 9 of the top scene 8 of the groove 7 of the first invention is projected downward to form a cut piece stopper device for a pipe drilling machine. The third invention, the groove 7 of the first invention
Chip removal plate 1 that hangs down and protrudes from the front end of sky scene 8
4 was provided as a cut piece stopper device for a pipe drilling machine.

[0027]

In the first invention, the pipe drill 1 (FIG. 3) is attached to the gate valve 61, the gate valve 61 is opened, and the cutter 3 and the pilot drill 6 are connected in the same manner as in the conventional example shown in FIG. The pilot pipe 6 drills a hole 40 in the main pipe 38.

An opening 43 is formed in the main pipe 38 by the cutter 3.
When the pilot drill 6 is lowered while drilling (FIG. 27), the outer surface of the arm 20 which is pivotally mounted on the pilot drill 6 comes into contact with the corner 41 of the hole 40 as in FIG.
Arm 20 will fit into the groove 7 against the spring 34,
It passes through the hole 40.

Then, the upper part of the arm 20 is similar to that of FIG.
To be opened by the spring 34, the arm 20 is in contact with the pilot drill 6 (in the same manner as in FIG. 1, the upper edge 13 of the communicating hole 12 of the groove 7, the contact the lower back of the arm 20),
The arm 20 stops at a position where the upper part protrudes from the groove 7, and the upper part of the arm 20 is located outside the lower edge of the hole 40.

[0030] Still, the perforations of the main pipe 38 by the cutter 3 is performed, the cut pieces 39 in FIG. 5, when in the same manner as in FIG. 27 is separated from the main pipe 38, the cut piece 39 is reliably ride on top of the arm 20 Is held. Then, it is pulled up together with the cutter 3.

In the first invention , furthermore, the upper surface 21 of the arm 20 is formed into an arcuate surface, and the rear portion of the upper surface 21 of the arm 20 is positioned on the top of the groove 7 at the position where the arm 20 is rotated and stopped. Since it is below the front end 9 of the arm 8, the gap between the ceiling scene 8 and the upper surface 21 of the arm 20 can be formed small, and the chip 45 (FIG. 12) is prevented from entering the groove 7.

Therefore, as shown in FIG.
Even when drilling the hole 8 from the upper part to the lower part, it is possible to prevent the chips 45 from entering the groove 7, and to pass through the hole 40 drilled at the bottom of the main pipe 38 while holding the arm 20 in the groove 7. There is no problem in making it work.

In the second invention , since the front end 9 of the top scene 8 of the groove 7 protrudes downward, the gap between the upper surface 21 of the arm 20 and the front end 9 of the top scene 8 is further reduced. It is possible to prevent chips 45 from entering the groove 7. (FIG. 12)

According to the third aspect of the present invention, since the chip removing plate 14 is further provided at the front of the top scene 8 of the groove 7, it is provided between the upper surface 21 of the arm 20 and the top scene 8 of the groove 7. The gap can be formed as a small one, and the chip 45 can be prevented from entering the groove 7. (FIG. 13)

[0035]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 through 5 are diagrams for <br/> description of the basic structure of the real施例of the present invention. FIG.
As shown in FIG. 1, a housing 2 is provided, and a flange is provided at a lower edge of the housing 2.

A steel cutter 3 is provided in the housing 2 so as to be rotatable and vertically movable. A pilot drill 6 is provided at the center of the cutter 3 so as to hang down.
Is formed to extend downward from the lower end of the cutter 3.

A pair of vertical grooves 7 are provided on the outer peripheral surface of the distal end portion of the pilot drill 6 on the back side thereof.
The lower part of a prismatic arm 20 that fits in the groove 7 is rotatably mounted on a lower part of the arm by a shaft 33 formed as a pin.

Near the lower ends of the pair of grooves 7, grooves 7
7 are provided, and the communication holes 1 communicate with each other.
2, a spring 34 formed as a tension spring is inserted. Both ends of the spring 34 are locked near the lower end of the arm 20, and the upper part of the arm 20 is located outside the groove 7. It is urged to protrude.

The arm 20 is positioned at a position where the upper part of the arm 20 projects outward from the groove 7.
Is formed so that the lower back surface thereof abuts on the upper edge 13 of the communication hole 12 so as to stop the rotation, thereby forming a cut piece stopper device of the pipe drilling machine 1.

The cut piece stopper device is provided with a pair of grooves 7 on the back side of the pilot drill 6 and a pair of arms 20.
However, the groove 7 and the arm 20 can be provided on only one side surface.

FIG. 6 shows another structure of the cut piece stopper device.
The cut piece storage described below
The same parts as those of the power device are denoted by the same reference numerals, and description thereof is omitted. In this cut piece stopper device , the spring 34 is formed by a leaf spring, and the spring 34 is formed so as to press the center rear surface of the arm 20 outward.
5 is formed so as to come into contact with the inner surface of the groove 7 to stop the rotation of the arm 20.

FIGS. 7 to 11 are views for explaining one embodiment of the first invention . In this embodiment, the upper surface 21 of the arm 20 is attached to a shaft 33 on which the arm 20 is rotatably mounted.
Are formed on an arc-shaped surface centered on the center line of the circle.

A notch 24 is formed on the back surface of the arm 20, and a rear portion of the upper surface 21 of the arm 20 is made to protrude rearward.
1 is formed so that the rear portion is below the front end 9 of the ceiling scene 8 of the groove 7 and the front corner 26 of the lower surface 23 of the arm 20.
Abuts against the lower end surface 11 of the groove 7 so that the rotation of the arm 20 is stopped.

FIG. 12 shows an embodiment of the second invention. In this embodiment, the front end 9 of the top scene 8 of the groove 7 of the pilot drill 6 is projected downward at an acute angle. The front end 9 is provided so as to approach the arc-shaped surface of the upper surface 21 of the arm 20, so that the chips 45 can be easily removed. FIG. 13 shows an embodiment of the third invention. In this embodiment, a recess is formed above the front of the top scene 8 of the groove 7 of the pilot drill 6 and cut into the recess. The powder exclusion plate 14 is attached so that its lower part is suspended and protrudes from the front of the ceiling scene 8.

FIG. 14 shows still another embodiment of the third invention.
An upper surface 21 of the arm 20 is provided on the upper surface 8 of the arm 20 at the top of the top scene 8 of the groove 7 by means of the upper surface 21 of the arm 20.
The protruding portion 22 protruding to the rear is restrained, and the rotation of the arm 20 is stopped.

[0046] Among the cut pieces stopper device, that shown in Figure 1 to 6, the top scene 8 and the arm 20 of the groove 7
There is a possibility that a gap may be formed between the upper surfaces 21 of FIG.
The one shown in FIGS. 1 to 6 is preferably used for connecting the branch pipes of different diameters shown in FIGS.

That is, in the connection of the branch pipes of different diameters, the main pipe 3
8, since only the upper surface of the hole 8 is provided with the opening 43.
A hole 40 is drilled in the upper surface of the main pipe 38 connecting the different diameter branch pipes with the pilot drill 6, and the groove 7 of the pilot drill 6 is formed.
After the arm 20 is put into the hole 40 and passed through the hole 40,
Since the arm 20 is not put in the groove 7 again,
Even if the chips 45 enter the groove 7 due to the perforation of the opening 43 due to the above, the operation is not hindered.

On the other hand, as shown in FIG. 10, when the opening 43 is formed by drilling from the upper surface to the lower surface of the main pipe 38 by the shut-off method in the hot tapping method, in particular, as shown in FIG. In the case where the outer diameter of the cutter 3 is smaller than the outer diameter of 38 and the cutout 44 appears on the side of the main pipe 38,
If the chips 45 easily enter the groove 7, a problem occurs.

That is, when the cut 44 appears on the side of the main pipe 38 as described above, a large amount of cuttings 45 are discharged inside the main pipe 38 and the side of the main pipe 38 is connected to the cutter 3.
Then, the lower surface of the main pipe 38 must be pierced with the pilot drill 6, and the arm 20 must be accommodated in the groove 7 and passed through the hole 40.

Therefore, if the chips 45 enter the groove 7 before passing the arm 20 through the hole 40 on the lower surface of the main pipe 38, the arm 20 does not fit in the groove 7 and the hole 40
There is a problem in passing the arm 20 through the inside.

[0051]

[0052]

[0053]

[0054]

[0055]

[Effect of the invention] The first invention is to form a top surface 21 of A over arm 20 in a circular arc shape, and, at a position where the arm 20 is stopped to rotate, the rear portion of the upper surface 21 of the arm 20, the groove 7 Heaven scene 8
Is located below the front end 9.

Therefore, the ceiling scene 8 of the groove 7 and the arm 20
Can be formed to be small, the chips 45 can be prevented from entering the groove 7, and the arm 20 can be accommodated in the groove 7 without any trouble. In the second invention , since the front end 9 of the top scene 8 of the groove 7 projects downward, the gap between the top scene 8 of the groove 7 and the upper surface 21 of the arm 20 can be formed with a smaller gap. In addition, it is possible to prevent chips 45 from entering the groove 7.

The third idea is that, at the front of the top scene 8 of the groove 7,
Since the chip removing plate 14 is provided so as to hang down, the gap between the top scene 8 of the groove 7 and the upper surface 21 of the arm 20 can be formed even smaller, and the entry of the chip 45 into the groove 7 can be prevented. .

Accordingly, a cutting stopper device of a pipe drilling machine capable of securely holding a cut piece of a main pipe can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view of an essential part for explaining a basic structure of an embodiment of the present invention.

FIG. 2 is a front view of an essential part for explaining a basic structure of the embodiment of the present invention;

FIG. 3 is a partial sectional view schematically showing an embodiment of the present invention;

FIG. 4 is a sectional view of an essential part showing an operation state for explaining a basic structure of one embodiment of the present invention;

FIG. 5 is a sectional view of an essential part showing an operation state for explaining a basic structure of one embodiment of the present invention;

FIG. 6 is a sectional view of an essential part for explaining a basic structure of another embodiment of the present invention.

FIG. 7 is a sectional view of a main part of an embodiment of the first invention.

FIG. 8 is a front view of a main part of one embodiment of the first invention.

FIG. 9 is a perspective view of an arm according to an embodiment of the first invention.

Shows a drilling state of the embodiment of Figure 10 the present devised

FIG. 11 is a sectional view of a main part showing an operation state of the embodiment of the first invention.

FIG. 12 is a sectional view of a main part of an embodiment of the second invention.

FIG. 13 is a sectional view of a main part of an embodiment of the third invention.

FIG. 14 is a sectional view of a main part of another embodiment of the third invention.

Figure 15 shows a fitting for use in the examples and the conventional example of the devise

Show the embodiment and the fitting attached to the main pipe to be used in the conventional example of Figure 16 the present devised

FIG. 17 is a partial sectional view for explaining a conventional example.

[18] Examples and shows the cut pieces formed by drilling in the conventional example of the devise

[19] Examples and Figures for explaining the conventional example of the devise

FIG. 20 is a view showing a plug used in an embodiment of the present invention and a conventional example.

FIG. 21 is a sectional view of a main part of a conventional example.

FIG. 22 is a sectional view of a main part showing an operation state of a conventional example.

FIG. 23 is a sectional view of a main part showing an operation state of a conventional example.

FIG. 24 is a sectional view of a main part of a conventional example.

FIG. 25 is a sectional view for explaining another conventional example.

FIG. 26 is a partial sectional view for explaining another conventional example.

FIG. 27 is a partial sectional view for explaining another conventional example.

FIG. 28 is a sectional view for explaining another conventional example.

FIG. 29 is a sectional view for explaining another conventional example.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tomio Tsurumaki 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Inside the Hakodate Co., Ltd. (72) Kazuo Kobayashi 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Inside the Honko Co., Ltd. (72) Inventor Tomoyuki Kito 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Japan Inside the Honko Co., Ltd. Inside (72) creator Yasuo Unemoto Japan Steel Pipe Works Co., Ltd., 88, Onocho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture (56) References JP-A-63-151206 (JP, U)

Claims (3)

(57) [Scope of request for utility model registration] 1. A vertical groove 7 is provided on an outer peripheral surface of a tip portion of a pilot drill 6 provided on a cutter 3 of a pipe drilling machine 1.
A lower portion of an arm 20 that fits in the groove 7 is rotatably mounted on a lower portion of the groove 7. The arm 20 is turned by a spring 34 in a direction in which the upper portion of the arm 20 projects outward from the groove 7. with biasing, at a position where the top of the arm 20 protrudes from the groove 7, formed as pivot arm 20 is in contact with the pilot drill 6 is stopped, and the arm 2
0 is formed as an arc-shaped surface, and this arm 20 is turned.
Moves to abut the pilot drill 6 and at the position where it stops,
The rear part of the upper surface 21 of the arm 20 is the front end of the ceiling scene 8 in the groove 7
9. A cutting piece stopper device for a pipe drilling machine formed so as to be below 9 ; 2. The front end 9 of the top scene 8 of the groove 7 is projected downward.
The cut piece stopper device for a pipe drilling machine according to claim 1 , wherein the cut piece stopper device is provided. 3. Hanging and protruding from the front of the ceiling scene 8 in the groove 7
2. The cut piece stopper device for a pipe drilling machine according to claim 1, further comprising a chip removing plate (14) .