JP3164142B2 - Fluid pipe perforator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drilling device for forming a branch hole for branching a main pipe into a branch pipe without interrupting the flow of fluid in the main pipe. The present invention relates to a fluid pipe drilling device that collects metal powder generated during drilling simultaneously with drilling work.

[0002]

2. Description of the Related Art An operation for attaching a branch pipe to a main pipe without interrupting a fluid such as a gas is performed by, for example, steps schematically shown in FIGS.

[0003] First, as shown in FIG. 8, a half joint 3 having a connection pipe 2 on one side is mounted on a main pipe 1 in a direction orthogonal to the main pipe 1. At both ends of the connection pipe 2, flanges 4, 5
Are formed integrally, and an insertion hole 6 is formed in an intermediate portion.

[0004] Next, as shown in FIG. 9, a gate valve device 8 having a flexible gate valve 7 housed therein so as to be movable up and down is detachably attached to the upper part of the insertion hole 6 in the connection pipe 2. A drilling device 11 having a cylindrical cutter 9 and a centering drill 10 at the center thereof is mounted on the flange 5 in a sealed manner.

[0005] Next, as shown in FIG.
After rotating the centering drill 10 to the left while rotating the centering drill 10 to form the branch hole 12 in the main pipe 1, the cutter 9 and the centering drill 10 are removed with the cut piece 13 accommodated in the cutter 9. Pull back to the right. After that, the lifting rod 14 supporting the gate valve 7 is pushed down,
The gate valve 7 is inserted into the connection pipe 2 through the insertion hole 6, and the lifting rod 14 is strongly pressed to move the gate valve 7 into the connection pipe 2.
To temporarily block the fluid in the main pipe 1 from flowing into the connection pipe 2 side.

In this state, the drilling device 11 is removed, and FIG.
The branch pipe 15 is connected to the connection pipe 2 as shown in FIG. Thereafter, the gate valve 7 is pulled up to allow the fluid to flow in the direction of the branch pipe 15, and then the gate valve device 8 is removed from the connecting pipe 2, and a plug 16 is screwed into the insertion hole 6 as shown in FIG. Insert and seal.

By the above steps, the branch pipe 15 can be attached without interrupting the fluid such as gas flowing in the main pipe 1.

As described above, in the method of mounting the branch pipe 15 without interrupting the flow of the fluid in the main pipe 1, the branch hole 12
When the mounting operation of the branch pipe 15 is completed in a state where the metal powder generated at the time of the drilling is accumulated in the main pipe 1 and the connection pipe 2 near the cut portion, the metal powder is added to the main pipe 1 and the branch pipe 15 together with the fluid. May flow, and may bite into a valve or the like provided on the way to cause poor sealing, or when the fluid is tap water or the like, it may be mixed into drinking water.

In order to prevent this, it is necessary to collect and discharge the metal powder after drilling the branch hole 12, and conventionally, the required portion below the main pipe 1 and the connecting pipe 2 A drain D for removing metal powder is provided beforehand, and the drain D is opened to remove the metal powder.

[0010]

In the method using the drain D, it is difficult to completely remove the metal powder in a short time, and it is necessary to discharge the fluid from the drain for a while until the metal powder is discharged. As a result, not only is the fluid wasted, but the processing is cumbersome. In particular, this operation is impossible if the fluid is a flammable gas or the like.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and can collect and collect metal powder easily and in a short time at the same time as a branch hole drilling operation without providing a drain. It is an object of the present invention to provide a fluid pipe piercing device as described above.

[0012]

In order to solve the above-mentioned problems, a drilling device according to the present invention is provided with a branch hole communicating with a branch pipe formed on an outer peripheral wall of a metal main pipe in a cylindrical shape linked to a driving means. A fluid pipe drilling device adapted to be drilled by a cutter, wherein a cutting edge surface of the cutter is inclined inward from a tip end surface of a cylinder , and a permanent magnet is provided on an inner peripheral surface of the cutter. A suction ring made of a held non-magnetic ring member is fitted. According to this feature, since the cutting edge surface of the cutter is inclined inward, most of the metal powder is directed toward the permanent magnet inside the cutter, and the metal powder generated simultaneously with the drilling of the branch hole is easily removed. And it can be adsorbed and recovered in a short time. Therefore, it is effective for perforating an existing fluid pipe or the like in which discharge of metal powder is difficult. Also, since the metal powder can be collected without interrupting the flow of the fluid in the main pipe, there is no need to provide a drain in the connecting pipe or the like as in the related art, and therefore, the fluid can be discharged from the drain wastefully, No fluid flows out. In particular, since the permanent magnet is held inside the non-magnetic ring member, the cutter is prevented from being magnetized, and there is no danger that the metal powder is adsorbed to the blade portion and the machinability is impaired.

[0013]

In the above-mentioned perforating apparatus, the permanent magnets are composed of a plurality of permanent magnets arranged at substantially equal intervals in the circumferential direction, and each permanent magnet is protruded inward from the inner end of the non-magnetic ring member. Is preferred. By doing so, the exposed surface area of the permanent magnet is increased, and the effect of adsorbing metal powder is increased.

In the above-described punching device, it is preferable that the suction ring is fitted to the inner peripheral surface of the cutter so as to be slidable in the axial direction. By doing so, the suction ring can be held at a position close to the blade portion in advance, and also moves backward with the cut piece, so that the collection of the metal powder is effectively performed.

In the above-described punching device, it is preferable that the suction ring is elastically deformable in the radial direction by cutting off a part of the circumference in the circumferential direction. This eliminates the need for a means for holding the suction ring in the cutter and facilitates insertion into the cutter.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention applied to a method of connecting a branch pipe without interrupting the flow of fluid will be described below with reference to the drawings. The same members as those in the above-described conventional example are denoted by the same reference numerals and described.

1 and 2, a half joint 3 having a connecting pipe 2 is hermetically mounted on the outer peripheral wall of a ductile cast iron main pipe 1 as in the prior art. In the thick portion 2a formed on the upper surface of the intermediate portion of the connection pipe 2, two insertion holes 6, 6 communicating with the inside of the connection pipe are bored side by side in the pipe axis direction. Each of the insertion holes 6 is a stepped hole having a tapered surface shape whose diameter gradually decreases downward, and a female screw is engraved on the upper side of the hole.

On the upper surface of the thick portion 2a of the connection pipe 2,
A base plate 17 winds a chain-type fastener 18 around the outer peripheral surface of the intermediate portion of the connection pipe 2 in a U-shape.
And the other end of the bolt 19 is fixed to the base plate 1.
7 is penetrated and fastened with a nut 20 to be hermetically sealed and detachable.

Reference numeral 21 denotes a positioning pin screwed into the lower surface of the base plate 17.
Mounting is easy.

A body 23a at the lower end of a mounting device 23 comprising a gate valve device 8 and a plug insertion device 22 is fitted to the upper portion of the base plate 17 from above through a Teflon sheet 24. The attachment device 23 penetrates the center of the body portion 23 a between the gate valve device 8 and the plug insertion device 22, and connects the lower end of the support shaft 25, which faces in a direction perpendicular to the connection space 2, to the connection pipe 2 in the base plate 17. By penetrating it to a position deviated laterally (leftward) from the center of, and screwing the double nuts 26, 26 to the upper and lower ends thereof, it is possible to rotate horizontally around the support shaft 25.

Reference numeral 27 denotes a bearing, and reference numeral 28 denotes a packing for sealing a contact surface between the base plate 17 and the body portion 23a.

As shown in FIG. 2, the lower end of a stopper rod 30 urged downward by a compression coil spring 29 can be engaged with the center of the connection pipe 2 in the body 23a of the mounting device 23. A pair of locking holes 31, 31 are formed so as to be opposed by 180 ° about the support shaft 25.

When the stopper rod 30 is engaged with one of the locking holes 31 (right side in FIG. 2), the gate valve device 8
Are aligned with the center of the pipe axis of the connection pipe 2 so as to be located above the two insertion holes 6 (the position indicated by the solid line in FIG. 1). When the entire mounting device 23 is rotated by 180 ° about the support shaft 25 and the stopper rod 30 is engaged with the other (left) locking hole 31, the center of the plug insertion device 22 is connected to the pipe of the connection pipe 2. Aligned with the center of the shaft, it is located above between the two insertion holes 6 (the position of the imaginary line in FIG. 1).

Numerals 32, 32 are handles for rotating the mounting device 23.

Oval cylindrical device case 33 of gate valve device 8
As shown in detail in FIG. 2, two screw rods 34, 34 coaxial with the center of each insertion hole 6 are housed therein, and both screw rods 34 have corners protruding from the upper end of the case 33. Shaft 34
By rotating a with a handle or a driving device (not shown), it can be rotated without being displaced in the vertical direction.

Each of the threaded rods 34 is screwed with a cylindrical sleeve 35 having an internal thread cut therein so that it can only move up and down. The lower end of each sleeve 35 is fitted into the insertion hole 6. A valve holder 36 made of rubber or soft plastic capable of tightly closing the valve is fixed, and a flexible valve 37 is attached to the valve holder 36.

The valve body 37 has been disclosed by the applicant of the present invention in Japanese Patent Application Laid-Open No. Hei 6-81969, that is, an elastic seal frame 37a having an outer peripheral shape compatible with the inner diameter of the connection pipe 2, and a seal 37a. It is preferable to use a valve body or the like made of a soft rubber or plastic thin plate 37b held over the entire periphery of the frame 37a.

When the threaded rod 34 is rotated while the gate valve device 8 is at a position aligned with the center of the pipe axis of the connecting pipe 2, the sleeve 35 is moved up and down by a screw feed action, and the valve body 3 is moved up and down.
7 can move between an upper limit position to be housed in the case 33 and a lower limit position where the elastic member is elastically deformed through the insertion hole 6 and is inserted to the bottom of the connection pipe 2 in the flow path. In the position, the screw rod 34 is strongly rotated to
When the valve 5 is further lowered, the elastic seal rod 37a and the thin plate 37b expand in the flow path and come into close contact with the inner peripheral wall of the flow path, so that the flow path of the connection pipe 2 is closed.

The plug insertion device 22 is screwed into the female screw of the insertion hole 6 at the lower end of each of the two support rods 40, which penetrate the body portion 23a so as to be slidable up and down, and seal it. When the plug insertion device 22 is aligned with the center of the pipe axis of the connection pipe 2, the supporting rods 40 are lowered, and the square shaft section 40a at the upper end is formed. By rotating the plug with the handle, the plug can be screwed into the insertion hole 6 in a sealed manner.

A drilling device 41 of the present invention is hermetically bolted to the flange 5 at the open end of the connection pipe 2 via a packing 43 provided on the mating surface of the flange 42. The drilling device 41 includes a cylindrical cutter 44 located in the connecting pipe 2 and a centering drill 45 provided on the center axis thereof, as in the related art, and the tip of the centering drill 45 is a blade portion 44a at the tip of the cutter 44. Slightly protruding.

Cutter 44 and centering drill 45
By operating a known driving device (not shown) provided at the rear end of the support cylinder 46, the screw is fed by a screw feed mechanism while being integrally rotated by a rotation shaft 51 moving in the support cylinder 46. It can reciprocate towards the tube 1.

The blade portion 44a on the inner peripheral surface of the cutter 44
3 and 4, a non-magnetic ring member 47 made of a synthetic resin or the like closely attached to the inner surface of the cutter 44, and a predetermined interval between the inner and outer circumferential portions of the non-magnetic ring member 47 are shown. An attraction ring 49 composed of a plurality of permanent magnets 48 embedded so as to have a circular surface is fitted so as to be movable in the axial direction of the cutter 44.

The suction ring 49 can be elastically deformed in the radial direction by cutting a part in the circumferential direction, and is held on the inner surface of the cutter 44 by using the elastic force in the radially expanding direction. Have been. At the cut-off both ends of the suction ring 49, through holes 50 for inserting and removing the suction ring are formed.
And the suction ring 49 is elastically deformed in the diameter-reducing direction, so that the suction ring 49 can be easily inserted into and removed from the cutter 44.

The blade portion 44a of the cylindrical cutter 44
The cutting surface is inclined inwardly from the distal end surface of the cylinder, so that most of the metal powder generated at the time of punching a branch hole described later goes toward the inside of the cutter 44.

Next, a series of procedures for connecting branch pipes using the drilling device 41 of the above embodiment will be described.

After attaching the half joint 3 to the main pipe 1 as before, the mounting device 23 and the perforating device 41 are mounted on the connecting pipe 2. Then, the entire mounting device 23 is rotated, and the rotation of the gate valve device 8 is restrained by aligning the center of the gate valve device 8 with the pipe axis of the connecting pipe 2 as shown by the solid line in FIG. 1 (state of FIG. 2).

Next, while rotating the cutter 44 and the centering drill 45 of the drilling device 41, the cutter 44 is advanced toward the main pipe 1 to pierce the pipe wall of the main pipe 1 as shown in FIG. Most of the metal powder generated at the time of the perforation is adsorbed by the permanent magnet 48 of the adsorption ring 49 fitted in advance near the blade portion 44a in the cutter 44. That is, when the metal powder being drilled by the cutter 44 is directed to the inside of the cutter 44 as described above, the metal powder is effectively attracted to the permanent magnet 48 near the blade portion 44a.

Since the contact portion of the suction ring 49 with the inner surface of the cutter is a non-magnetic ring 47, there is no danger that the cutter 44 will be magnetized and metal powder will adhere to the blade portion 44a of the suction ring 49, which will not hinder cutting. .

When the suction ring 49 is slidably held in the cutter 44, the cut portion gradually enters the cutter 44 as the drilling operation proceeds, and is pushed backward by the cut pieces to move rearward. Therefore, the movement of the cutter 44 and the movement of the cut piece into the cutter are not hindered.

Next, as shown in FIG. 7, after the main pipe 1 has pierced the branch hole 12, the cutter 44 and the centering drill 45 are retracted to the open end of the connecting pipe 2. At this time, the cut piece 13 is held in the cutter 44 and pulled out.

Thereafter, the threaded rod 34 of the gate valve device 8 is rotated to lower the valve element 37 through the insertion hole 6 into the connecting pipe 2 and expand it in the flow path, thereby temporarily blocking the flow path. I do. In this state, the drilling device 41 is connected to the connecting pipe 2.
After that, a branch pipe (not shown) is connected to the connection pipe 2 as in the prior art, and the valve body 37 is pulled up to allow the fluid to flow through the branch pipe.

Then, as shown by the imaginary line in FIG. 1, the mounting device 23 is rotated by 180 °, the plug insertion device 22 is positioned on the center of the connection shaft of the connecting pipe 2, and the support rod 40 is lowered and rotated. As a result, a plug (not shown) attached to the lower end of the support rod 40 is screwed into the insertion hole 6, and the hole is sealed.

Finally, the fastener 18 is removed, and the entire mounting device 23 is removed together with the base plate 17 from the connecting pipe 2 so that the flow of the fluid in the main pipe 1 is branched off to the connecting pipe 2 without interruption. Can install pipe.

As described above, when the punching device according to the present invention is used behind the connection of the branch pipe as described above, almost all the metal powder is adsorbed by the suction ring 49 at the same time as the drilling operation of the branch pipe 12. Therefore, it is not necessary to provide a drain in the main pipe 1 or the connecting pipe, open the drain, and discharge the metal powder together with the fluid as in the related art. As a result, the fluid is not wastefully discharged, and there is no possibility that the flammable fluid is discharged to cause a problem.

The present invention is not limited to the above embodiment.

For example, the permanent magnet 48 of the attraction ring 49
May be embedded so as to protrude inward from the inner peripheral surface of the non-magnetic ring member 47 as shown in FIG. By doing so, the exposed surface area of the permanent magnet 48 increases, and the effect of adsorbing the metal powder increases.

The suction ring 49 may be constantly urged forward by a compression coil spring provided in the cutter 44 so that the spring is compressed and retracted during drilling.

When the diameter of the main pipe 1 is small, the centering drill 45 may be omitted, and the main pipe 1 may be perforated only with the cutter 44.

The present invention can be applied not only to the method of connecting the branch pipes without shutting off the fluid as described above, but also to the case of simply piercing an existing fluid pipe in which it is difficult to collect metal powder. It is.

[0051]

The present invention has the following effects.

(A) According to the invention of claim 1, the cutter
Of the metal powder
Moves toward the permanent magnet inside the cutter, and can easily and quickly adsorb and collect the metal powder generated simultaneously with the perforation of the branch hole . Therefore, it is effective for perforating an existing fluid pipe or the like where it is difficult to discharge the metal powder. In addition, since the metal powder can be collected without interrupting the flow of the fluid in the main pipe, it is not necessary to provide a drain in the connecting pipe or the like as in the related art, so that the fluid can be drained from the drain wastefully or flammable. No fluid flows out. In particular, permanent magnets
Because it is held inside the magnetic ring member, the cutter
Is prevented from being magnetized, and the metal powder adheres to the blade,
There is no risk that the machinability will be impaired.

[0053]

( B ) According to the second aspect of the invention, since the exposed surface area of the permanent magnet is increased, the effect of adsorbing the metal powder is enhanced.

( C ) According to the third aspect of the present invention, the suction ring can be held at a position close to the blade in advance, and the suction ring moves backward together with the cut piece, so that the collection of the metal powder is effectively performed. Done.

( D ) According to the fourth aspect of the present invention, the means for holding the suction ring in the cutter becomes unnecessary, and the insertion of the suction ring into the cutter becomes easy.

[0057]

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of a main pipe joint used in a branch pipe mounting method to which the present invention is applied.

FIG. 2 is a vertical sectional front view taken along line II-II in FIG.

FIG. 3 is an enlarged vertical sectional view of a cutter.

FIG. 4 is an enlarged vertical sectional front view taken along the line IV-IV of FIG. 3;

FIG. 5 is a longitudinal sectional front view of the same portion as FIG. 4 showing another embodiment of the suction ring.

FIG. 6 is a longitudinal sectional view of a main part showing a state when a branch hole is drilled by a cutter.

FIG. 7 is a longitudinal sectional view of a main part showing a state in which the cutter is retracted after the branch hole is also drilled.

FIG. 8 is a longitudinal sectional view showing a step of attaching a joint to a main pipe in a conventional example.

FIG. 9 is a longitudinal sectional view showing a state in which a gate valve device and a perforation device are attached to the connection pipe.

FIG. 10 is a longitudinal sectional view showing a state where a branch hole is formed in the main pipe, and then the connecting pipe is shut off by a gate valve.

FIG. 11 is a longitudinal sectional view showing a state where the branch pipes are connected.

FIG. 12 is a longitudinal sectional view showing a state where a plug is attached to an insertion hole after the gate valve device is removed in the same manner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main pipe 2 Connection pipe 2a Thick part 3 Half joint 4, 5 Flange 6 Insertion hole 7 Gate valve 8 Gate valve device 9 Cutter 10 Centering drill 11 Drilling device 12 Branch hole 13 Cut piece 14 Lifting rod 15 Branch pipe 16 Plug 17 Base plate 18 Tightening tool 19 Bolt 20 Nut 21 Pin 22 Plug insertion device 23 Mounting device 23a Body part 24 Teflon sheet 25 Support shaft 26 Double nut 27 Bearing 28 Packing 29 Compression coil spring 30 Stopper rod 31 Lock hole 32 Handle 33 Case 34 Screw rod 35 Sleeve 36 Valve holder 37 Valve body 37a Elastic seal frame 37b Thin plate 40 Support rod 40a Square shaft part 41 Drilling device 42 Flange 43 Packing 44 Cutter 44a Blade part 45 Centering drill 46 Support cylinder 47 Nonmagnetic ring member 48 Permanent Magnet 49 suction ring 50 through hole 51 rotating shaft

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Junya Nakae 2-8-8, Kawaminami, Ichikawa, Chiba Prefecture Inside Keiyo Gas Co., Ltd. (72) Hiroyuki Wada 2-8-8, Kawaminami, Ichikawa-shi, Ichikawa, Chiba Prefecture In Keiyo Gas Co., Ltd. (56) References JP-A-6-48859 (JP, U) JP-A 62-126804 (JP, U) JP-A 43-26233 (JP, Y1) (58) Fields surveyed ( Int.Cl. ⁷ , DB name) B23B 41/08 B23B 41/00 B23B 47/34 B23B 51/04

Claims (4)

(57) [Claims] 1. A drilling device for a fluid pipe, wherein a branch hole communicating with a branch pipe is bored in an outer peripheral wall of a metal main pipe by a cylindrical cutter linked to a driving means. Characterized in that the cutting edge surface is inclined inward from the distal end surface of the cylinder , and an attraction ring made of a non-magnetic ring member holding a permanent magnet inside is fitted to the inner peripheral surface of the cutter. Fluid pipe perforator. 2. A permanent magnet comprising a plurality of permanent magnets arranged at substantially equal intervals in a circumferential direction, and each permanent magnet protruding inward from an inner end of a non-magnetic ring member.
2. The fluid pipe perforating apparatus according to claim 1. 3. A suction ring, perforating apparatus fluid conduit according to any one of claims 1 to 2 are fitted swingably axially on the inner peripheral surface of the cutter. 4. A suction ring, by excising a part of its circumference, perforating apparatus fluid conduit according to any one of claims 1 to 3 which is elastically deformable in the radial direction.