JPH0947910A - Removing device for metal chip or powder cut in fluid tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and surely collect metal chips or powder in a fluid path without arranging a drain in a main pipe or connection pipe and without exhausting fluid. SOLUTION: A connection pipe 2 connected to a main pipe 1 is provided with an auxiliary pipe 44 having a guide pipe 45 inclined in the direction towards the pipe 2. Attracting means composed of a plurality of permanent magnet pieces 51 connected to a flexible control rod 47 is arranged in the guide pipe 45 so that it can move to or move back from the pipe 1. The metal powder generated during the boring operation of a branch hole 12 are attracted by the pieces 51 when the means 48 is inserted in the pipe 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal generated when a branch hole is formed in a main pipe when a branch hole is formed in the main pipe for diverting the flow to the branch pipe without interrupting the flow of the fluid in the main pipe. The present invention relates to a device for removing metal chips, which collects and collects powder.

[0002]

2. Description of the Related Art An operation for attaching a branch pipe to a main pipe without shutting off a fluid such as a gas is carried out in the steps as schematically shown in FIGS.

First, as shown in FIG. 7, the main pipe 1 is equipped with a half joint 3 having a connecting pipe 2 oriented in a direction orthogonal to the main pipe 1. At both ends of the connecting pipe 2, flanges 4, 5 are provided.
Are integrally formed, and an insertion hole 6 is bored in the middle part.

Next, as shown in FIG. 8, a sluice valve device 8 having a flexible sluice valve 7 housed therein in a vertically movable manner is detachably attached to the upper portion of the insertion hole 6 in the connecting pipe 2. A punching device 11 having a cylindrical cutter 9 and a centering drill 10 in the center thereof is attached to the flange 5 in a sealed manner.

Then, as shown in FIG. 9, the cutter 9 and the centering drill 10 are rotated and moved to the left to form a branch hole 12 in the main pipe 1, and the cut pieces 13 are cut off. Cutter 9 when housed in 9
And the centering drill 10 is pulled back to the right. After that, push down the lifting rod 14 supporting the gate valve 7,
The sluice valve 7 is inserted into the connecting pipe 2 through the insertion hole 6, and the elevating rod 14 is strongly pressed to connect the sluice valve 7 to the connecting pipe 2.
The fluid in the main pipe 1 is temporarily blocked from flowing into the connection pipe 2 side by expanding the inside.

In this state, the punching device 11 is removed, and FIG.
The branch pipe 15 is connected to the connecting pipe 2 as indicated by 0. After that, the sluice valve 7 is pulled up to allow the fluid to flow toward the branch pipe 15, the sluice valve device 8 is removed from the connecting pipe 2, and the plug 16 is screwed into the insertion hole 6 as shown in FIG. Insert and seal.

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

As described above, in the method of mounting the branch pipe 15 without blocking the flow of the fluid in the main pipe 1, the branch hole 12
When the installation work of the branch pipe 15 is finished while the metal powder generated during the perforation of the fuel is accumulated in the main pipe 1 and the connecting pipe 2 near the cut portion, the metal powder is discharged in the main pipe 1 and the branch pipe 15 together with the fluid. There is a risk that the fluid will flow and will be bitten by a valve or the like provided on the way to cause a poor sealing, or if the fluid is tap water or the like, it will be mixed into drinking water.

In order to prevent this, it is necessary to collect the metal powder after the perforation of the branch hole 12 and discharge it to the outside. Conventionally, the main portion of the lower portion of the main pipe 1 and the connecting pipe 2 are required. A drain D for removing metal powder is previously provided in the lower portion, and the drain D is opened to remove the metal powder.

[0010]

With the method according to the above-mentioned drain D, it is difficult to completely remove the metal powder, and the fluid must be discharged from the drain for a while until the metal powder is discharged. Not only is the fluid wasted, but its processing is also cumbersome. Especially when the fluid is a flammable gas or the like, it is dangerous to open the drain for a long time.

The present invention has been made in order to solve the above problems, and can easily and reliably collect and collect metal powder in a flow channel without providing a drain or wastefully discharging a fluid. It is an object of the present invention to provide a metal swarf removing device that can be used.

[0012]

In order to solve the above-mentioned problems, the metal swarf removing device of the present invention has a joint provided on the outer peripheral wall of a metal main pipe with a connecting pipe oriented substantially orthogonal to the main pipe. A device for removing metal chips in a fluid pipe, which is installed and collects chips generated at the time of punching a branch hole in an outer peripheral wall of a main pipe by a cutter inserted from the side of the connecting pipe. A guide tube facing the direction of the connecting pipe whose external opening end is closed is attached to the outer peripheral wall of the auxiliary pipe, which is detachably attached to the opening end of the connecting pipe and on which the punching device can be attached, and whose axis is inside the connecting pipe. The guide body is provided with a permanent magnet connected to a flexible operating rod projecting outside and provided in the guide pipe so as to intersect with the connecting pipe and the main pipe. It is also characterized in that it can be moved forward and backward toward the pipe. It is. Due to this feature, by simply inserting the adsorbent toward the main pipe, the metal powder generated when the branch hole is drilled can be effectively collected and collected. No need. As a result, it is possible to prevent the fluid from being unnecessarily discharged from the drain and to prevent the risk of the flammable gas or the like flowing out.

In the metal chip removing device of the present invention, it is preferable that both ends of the permanent magnet are held by a non-magnetic material having a diameter larger than the outer diameter of the permanent magnet. By doing so, the adsorbent does not adsorb to the connecting pipe or the like, so that the insertion and removal can be smoothly performed.

In the metal chip removing device of the present invention, it is preferable that a plurality of permanent magnets are arranged in the axial direction and a gap is formed between the adjacent permanent magnets.
By doing so, the surface area of the permanent magnet becomes large, so that the effect of collecting chips is enhanced.

In the apparatus for removing metal chips of the present invention, the outer peripheral surface of the non-magnetic material on the tip side is preferably a tapered surface or a curved surface whose diameter gradually decreases toward the tip. By doing so, the tip of the adsorbent can easily get over the step of the cut end of the branch hole and be inserted into the main pipe.

In the device for removing metal chips of the present invention, the holding members of the non-magnetic material formed at both ends of the permanent magnet are made of the non-magnetic material such that the maximum diameter portions are tied flush with each other. It is preferable that a plurality of radial frames be installed. By doing this, the adsorbent is
It is possible to smoothly move forward and backward without being caught by the stepped portions inside the connecting pipe, the auxiliary pipe, and the guide pipe, and to secure a sufficient space for capturing the metal powder between the radial frames.

In the device for removing metal chips of the present invention, the permanent magnet is covered with the non-magnetic cover, and the permanent magnet can be pulled out from the inside of the non-magnetic cover by detaching the holding member. preferable. By doing so, the metal powder can be easily separated from the non-magnetic cover by preventing the metal powder from directly sticking to the permanent magnet and by removing the permanent magnet after taking out the adsorbent.

In the device for removing metal chips of the present invention, the operating rod is
It is preferable that a piano wire is inserted through a flexible tube. By doing this, the appropriate rigidity of the piano wire can be used to linearly advance the adsorbent toward the connecting pipe, and also elastically bend, so that the adsorbent can move along the bottom surface of the connecting pipe. Can move forward.

[0019]

Embodiments of the present invention 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.

In FIGS. 1 and 2, a half joint 3 having a connecting pipe 2 is hermetically mounted on the outer peripheral wall of a main pipe 1 made of ductile cast iron, as in the conventional case. In the thick portion 2a formed on the upper surface of the intermediate portion of the connecting pipe 2, two insertion holes 6, 6 communicating with the inside of the connecting pipe are bored side by side in the pipe axial direction. Each insertion hole 6 is a tapered stepped hole 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 connecting pipe 2,
The base plate 17 has a chain-type tightening tool 18 wound in a U shape on the outer peripheral surface of the intermediate portion of the connecting pipe 2, and one end of the chain-type tightening tool 18 is wound on the base plate 17
The bolt 19 at the other end of the base plate 1
It is attached in a sealed and detachable manner by penetrating 7 and tightening with a nut 20.

Numeral 21 is a positioning pin screwed into the lower surface of the base plate 17 for the base plate 17 with respect to the connecting pipe 2.
Is easy to install.

A body portion 23a at a lower end portion of an attachment device 23 including a gate valve device 8 and a plug insertion device 22 is fitted to an upper portion of the base plate 17 from above via a Teflon sheet 24. The attachment device 23 penetrates through the center of the body portion 23 a between the gate valve device 8 and the plug insertion device 22, and attaches the lower end portion of the support shaft 25, which is oriented perpendicular to the connection pipe 2, to the connection pipe 2 in the base plate 17. It is possible to horizontally rotate about the support shaft 25 by penetrating it to a position that is offset laterally (leftward) from the center and screwing the double nuts 26, 26 on the upper and lower ends thereof.

Reference numeral 27 is a bearing, and 28 is a packing that seals the 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 engage with the center of the pipe axis of the connecting pipe 2 in the body portion 23a of the attachment device 1. A pair of locking holes 31, 31 are formed so as to face each other 180 ° about the support shaft 25.

When the stopper rod 30 is engaged with one locking hole 31 (right side in FIG. 2), the gate valve device 8
Has its center aligned with the center of the tube axis of the connecting pipe 2 and is positioned above both of the insertion hole 6 pipes (the position indicated by the solid line in FIG. 1). Further, the entire attachment device 23 is rotated 180 ° about the support shaft 25, and the stopper rod 30 is on the other side (left side).
When engaged with the locking hole 31 of the plug insertion device 22
Is aligned with the center of the tube axis of the connecting pipe 2 and is located above the both insertion holes 6 (the position of the imaginary line in FIG. 1).

Reference numerals 32 and 32 are handles for rotating the attachment device 23.

The elliptic cylindrical case 33 of the 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 are corners projecting from the upper end of the case 33. Shaft 34
By rotating a with a handle or a drive device (not shown), it can be rotated without displacement in the vertical direction.

A cylindrical sleeve 35 having an internal thread engraved therein is screwed into each of the screw rods 34 so as to be movable only up and down. The lower end of each sleeve 35 is fitted into the insertion hole 6. A valve holding body 36 made of rubber or soft plastic capable of sealing the valve is fixedly attached, and a flexible valve body 37 is attached to the valve holding body 36.

As the valve element 37, the one already disclosed in Japanese Patent Laid-Open No. 6-81969 by the applicant of the present application, that is, an elastic seal frame 37a having an outer peripheral shape adapted to the inner diameter of the connecting pipe 2, and a seal It is preferable to use a valve body or the like formed of a flexible rubber or plastic thin plate 37b held over the entire circumference of the frame 37a.

When the sluice rod 34 is rotated when the gate valve device 8 is at the position aligned with the center of the pipe axis of the connecting pipe 2, the sleeve 35 is moved up and down by the screw feeding action, and the valve body 3
7 can move between an upper limit position to be housed in the case 33 and a lower limit position which passes through the insertion hole 6 while being elastically deformed and is inserted to the bottom of the flow path of the connecting pipe 2, and the lower limit. When the screw rod 34 is strongly rotated in the position, the sleeve 3
When 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, whereby the flow path of the connecting 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 are slidably passed through the body portion 23a in the vertical direction and sealed. A removable plug (not shown) is detachably attached, and when the plug insertion device 22 is aligned with the center of the pipe axis of the connecting pipe 2, the supporting rods 40 are lowered and the angular shaft portion of the upper end portion is lowered. By rotating 40a with a handle or the like, the plug can be screwed into the insertion hole 6 in a sealed manner.

The flange 5 at the open end of the connecting pipe 2 has a structure shown in FIG.
As shown in, the metal chip removing device 41 of the present invention is hermetically bolted through a packing 43 provided on the mating surface of the flange 42.

On the outer peripheral wall of the upper portion of the substantially cylindrical auxiliary pipe 44 in the metal shavings removing device 41, a guide pipe 45 facing the direction of the connecting pipe 2 has its axis substantially parallel to the pipe axis in the connecting pipe 2. They are integrally provided so as to be inclined at 30 ° and cross each other.

At the upper open end of the guide tube 45, the cap 4
6 is screwed in a sealed manner. The cap 46 of the operating rod 47 which penetrates the central portion of the cap 46 and projects to the outside
An adsorbent 48 as shown in an enlarged view in FIG. 3 is attached to the inner end portion. The adsorbent 48 is made of a synthetic resin that holds a plurality of ring-shaped permanent magnets 51 that are externally fitted to a central shaft 49 made of a non-magnetic material via a collar 50, and both ends of the permanent magnet 51 in the axial direction. The holding members 52 and 53 are provided. The outer diameters of the two holding members 52 and 53 are larger than the outer diameter of the permanent magnet 51, and the outer peripheral surface of the holding member 52 on the tip side is a tapered surface that gradually reduces in diameter toward the tip.

The tip of the holding member 52 also has a permanent magnet 51.
Is embedded and is prevented from coming off by the enlarged diameter step portion 49a at the tip of the central shaft 49.

The operating rod 47 is constructed by inserting a piano wire 55 into a flexible tube 54 made of nylon or the like which penetrates the cap 46 slidably and sealingly, and elastically bends. It can be turned.

A known punching device 11 similar to the conventional one is hermetically attached to the flange 56 at the rear end of the auxiliary pipe 44, and the cylindrical cutter 9 located in the auxiliary pipe 44 is provided.
The centering drill 10 can reciprocate while rotating toward the main pipe 1 by operating a drive device (not shown) provided at the rear end of the support cylinder 11a.

Next, the metal chip removing device 41 of the above embodiment
An explanation will be given of a series of connection procedures for branch pipes using.

First, the mounting device 23 is rotated as a whole, as shown in FIG.
As shown by the solid line, the center of the sluice valve device 8 is aligned with the pipe axis of the connecting pipe 2 to restrain its rotation, and then the auxiliary pipe 44 is attached to the flange 5 of the connecting pipe 2 and further the auxiliary pipe 44 is attached. Attach the punching device 11. At this time, the adsorbent 48 is pulled up above the guide tube 45.

Then, the cutter 9 and the centering drill 10 of the punching device 11 are rotated and moved forward to form the branch hole 12 in the pipe wall of the main pipe 1 and then to move backward. At this time, the cutting piece 13 is held in the cutter 9 and pulled out (see FIG. 2).

Then, the operating rod 47 is pushed up to advance the adsorbent 48 into the main pipe 1 as shown by the imaginary line in FIG. Then, when the branch hole 12 is bored, the metal powder that has dropped onto the inner bottom surfaces of the main pipe 1 and the connecting pipe 2 is adsorbed by the plurality of permanent magnets 51 of the adsorbent 48, and most of it is collected. Then, the operating rod 47 is pulled up, and the adsorbent 48 is guided by the guide tube 45.
Back to the top of. At this time, since the outer peripheral surface of the holding member 52 at the tip of the adsorbent 48 is a tapered surface, the adsorbent 48 can easily enter the main pipe 1 by overcoming the step of the cut end of the branch hole 12. it can. Also, the holding member 5
Since the outer diameters of 2, 53 are larger than the outer diameter of the permanent magnet 51, the magnet 51 does not directly adsorb to the main pipe 1 or the connecting pipe 2 when the adsorbent 48 moves back and forth.
Can move back and forth smoothly.

Further, the center of the operating rod 47 is the piano wire 5
Since it is 5, the adsorbent 48 can be linearly advanced to reach the bottom surface of the connecting pipe 2 by utilizing its appropriate rigidity, and thereafter, the operating rod 47 elastically bends. The adsorbent 48 advances along the inner bottom surface of the connecting pipe 2.

After collecting the metal powder in the pipe, the adsorbent 48 is retracted into the guide pipe 45, and then the screw rod 3 of the gate valve device 8 is pulled.
4 is rotated so that the valve element 37 passes through the insertion hole 6 and the connecting pipe 2
By descending to the inside and expanding in the flow path,
Temporarily block the flow path.

In this state, the auxiliary pipe 44 and the punching device 11 are removed from the connecting pipe 2, and then a branch pipe (not shown) is connected to the connecting pipe 2 and the valve body 37 is pulled up to branch the fluid as in the conventional case. Circulate in a tube.

Then, as shown by the imaginary line in FIG. 1, the mounting device 23 is rotated 180 ° to position the plug insertion device 22 on the center of the pipe axis of the connecting pipe 2, and the supporting rod 40 is lowered to rotate. By doing so, 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 tightly plugged.

Finally, the fastener 18 is removed, and the entire attachment device 23 is removed together with the base plate 17 from the upper surface of the connecting pipe 2, thereby branching to the connecting pipe 2 without blocking the fluid in the main pipe 1. You can install a tube.

As described above, when connecting the branch pipe to the connecting pipe 2 without interrupting the flow of the fluid in the main pipe 1, the metal as in the present invention is provided between the connecting pipe 2 and the perforation device 11. When the chip removing device 41 is provided so that the metal powder is quickly adsorbed and collected after the branch hole 12 is drilled, a drain is provided in the main pipe 1 and the connecting pipe and opened as in the conventional case. Since it is not necessary to discharge the metal powder together with the fluid, there is no possibility that the fluid will be wastefully discharged or that the fluid will be a combustible gas or the like without causing any problems.

FIG. 4 shows another embodiment of the adsorbent 48.

The adsorbent 48 of this embodiment is composed of both holding members 5.
Each permanent magnet 51 between 2 and 53 is provided with a gap, and the central shaft 4
It is attached to 9. By doing so, the surface area of each permanent magnet 51 becomes large, and the metal powder enters into the gap and is adsorbed, so that the trapping effect is enhanced.

FIG. 5 shows still another embodiment of the adsorbent 48.

The attracting body 48 of this embodiment is composed of a permanent magnet 51.
Are separated by a collar 50 and are covered with a non-magnetic cover 56, and a plurality of frames 57 are radially formed integrally with the outer peripheral portion of the non-magnetic cover. The frame has a length such that the maximum diameter portions of the holding members 52 and 53 made of non-magnetic material are tied flush with each other, and is installed between the holding members 52 and 53.

The end of the piano wire 55 is fixed by a nut 58, and by removing the nut 58, the permanent magnet 51 together with the holding member 52 or 53 can be removed from the non-magnetic cover 56.

According to the present embodiment, the adsorbent 48 can smoothly advance and retreat without being caught by the stepped portions inside the main pipe 1, the connecting pipe 2, the auxiliary pipe 44, the guide pipe 45, etc. It is possible to secure a sufficient space between the frames 57 for capturing the metal powder. Further, the metal powder is not directly attached to the permanent magnet 51, and the metal powder can be easily dropped from the non-magnetic cover 56 by removing the adsorbent 48 and then removing the permanent magnet 51.

Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these embodiments, and even if there are changes and additions within the scope not departing from the gist of the present invention, the present invention is not limited. Included in the invention.

[0056]

The present invention has the following effects.

(A) According to the invention of claim 1, the metal powder generated at the time of forming the branch hole can be effectively collected and recovered by merely inserting the adsorbent toward the main pipe. There is no need to provide a drain in the connecting pipe or the like as in the conventional case. as a result,
It is possible to prevent the fluid from being wasted out of the drain, and to prevent the risk of flammable gas or the like flowing out.

(B) According to the second aspect of the invention, since the adsorbent does not adsorb to the connecting pipe or the like, it can be inserted and removed smoothly.

(C) According to the invention of claim 3, since the surface area of the permanent magnet is large, the effect of collecting chips is enhanced.

(D) According to the invention of claim 4, the tip of the adsorbent can easily pass over the step of the cut of the branch hole and be inserted into the main pipe.

(E) According to the invention of claim 5, the adsorbent can smoothly advance and retreat without being caught by the stepped portions inside the main pipe, the connecting pipe, the auxiliary pipe, the guide pipe and the like, and the radial shape It is possible to secure a sufficient space for capturing the metal powder between the frames.

(F) According to the invention of claim 6, the metal powder is not magnetically directly adhered to the permanent magnet, and the permanent magnet is pulled out after the adsorbent is taken out. Can be easily separated from.

(G) According to the invention of claim 7, since the adsorbent can be linearly advanced toward the connecting pipe and elastically bent by utilizing the appropriate rigidity of the piano wire, the adsorption The body can be advanced along the bottom surface of the connecting tube.

[0064]

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of a main pipe joint part to which the present invention is applied.

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

FIG. 3 is an enlarged vertical sectional view of an adsorbent.

FIG. 4 is an enlarged vertical sectional view showing another embodiment of the adsorbent.

FIG. 5 is an enlarged vertical sectional view showing still another embodiment of the adsorbent.

6 is a cross-sectional view taken along line VI-VI in FIG.

FIG. 7 is a vertical cross-sectional view showing a step of mounting a joint on a main pipe in a conventional example.

FIG. 8 is a longitudinal sectional view showing a state in which a sluice valve device and a punching device are similarly attached to the connecting pipe.

FIG. 9 is a vertical cross-sectional view showing a state in which a branch valve is also bored in the main pipe and then the connection pipe is blocked by a gate valve.

FIG. 10 is a vertical sectional view showing a state in which a branch pipe is also connected.

FIG. 11 is a vertical cross-sectional view showing a state in which the gate valve device is removed and a plug is attached to the insertion hole in the same manner.

[Explanation 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 Cutting Piece 14 Lifting Rod 15 Branch Pipe 16 Plug 17 Base Plate 18 Tightening Tool 19 Bolt 20 Nut 21 Pin 22 Plug Inserting Device 23 Mounting Device 24 Teflon Sheet 25 Spindle 26 Double Nut 27 Bearing 28 Packing 29 Compression Coil Spring 30 Stopper Rod 33 Case 34 Screw Rod 35 Sleeve 36 Valve Holding Body 37 Valve Disc 37a Elastic Seal Frame 37b Thin Plate 40 Support Rod 40a Square Shaft 41 Metal Chip Removal Device 42 Flange 43 Packing 44 Auxiliary Pipe 45 Guide Pipe 46 Cap 47 Operation Rod 48 Adsorber 49 Center Axis 49a Expanding Step 50 Collar 51 permanent magnets 52, 53 Holding member 54 Tube 55 Piano wire 56 Non-magnetic cover 57 Frame 58 Nut

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Junya Nakae 2-8-8 Ichikawanami, Ichikawa-shi, Chiba Keiyo Gas Co., Ltd. (72) Hiroyuki Wada 2-8-8 Ichikawa, Ichikawa-shi, Chiba Prefecture No.Kyoha Gas Co., Ltd.

Claims (7)

[Claims] 1. A metal main pipe is fitted with a joint provided with a connecting pipe in a direction substantially orthogonal to the main pipe, and a branch hole is formed in the outer peripheral wall of the main pipe by a cutter inserted from the side of the connecting pipe. A metal chip removing device in a fluid pipe for collecting chips generated during perforation when installing, an auxiliary pipe to which a perforating device can be attached, which is detachably attached to an open end of the connecting pipe. A guide pipe facing the direction of the connecting pipe whose outer open end is closed is provided on the outer peripheral wall of the pipe so that its axis intersects the pipe axis in the connecting pipe at a predetermined angle. An apparatus for removing metal chips in a fluid pipe, wherein an adsorbent including a permanent magnet connected to a flexible operating rod that is protruded in a direction is provided so as to be capable of advancing and retracting toward a connecting pipe and a main pipe. 2. The device for removing metal chips in a fluid pipe according to claim 1, wherein both ends of the permanent magnet are held by a non-magnetic material having a diameter larger than the outer diameter of the permanent magnet. 3. The device for removing metal chips in a fluid pipe according to claim 1, wherein a plurality of permanent magnets are arranged in parallel in the axial direction, and a gap is formed between adjacent permanent magnets. 4. The metal swarf in the fluid pipe according to claim 1, wherein the outer peripheral surface of the non-magnetic material on the tip side is a tapered surface or a curved surface whose diameter gradually decreases toward the tip. Removal device. 5. A plurality of radial frames made of a non-magnetic material are installed on each of the non-magnetic material holding members formed at both ends of the permanent magnet so as to connect the maximum diameter portions in a plane. 5. A device for removing metal chips in a fluid pipe according to any one of claims 2 to 4. 6. The metal in the fluid pipe according to claim 5, wherein the permanent magnet is covered with a non-magnetic cover, and the permanent magnet can be removed from the non-magnetic cover by detaching the holding member. Chip removing device. 7. The device for removing metal chips in a fluid pipe according to claim 1, wherein the operating rod is formed by inserting a piano wire into a flexible tube.