JP2594889B2 - Holder for automatic pipe end welding of cylindrical tubes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding pipe holder for joining two steel pipe ends having the same diameter with their cores aligned and automatically welding while maintaining the joined state. It is.

[0002]

BACKGROUND OF THE INVENTION According to the present invention, two pipes to be connected are fixed at their respective pipe ends with annular pipe holders each capable of adjusting the center position, and these two pipe holders are connected by a connecting rod. The other pipe holder is pulled from one pipe holder by a connecting rod to bring the pipe ends into close contact with each other.

[0003] An annular rail which is fixed by the two pipe holders and is joined to the two pipe joint surfaces joined to one of the pipe holders to which the pipes are fixed so as to surround the pipes. The present invention relates to a pipe holder capable of automatically welding the entire periphery of the joint end of the two pipes by a welding head movably mounted on the pipe holder.

[0004]

2. Description of the Related Art A conventional cylindrical pipe welding holder is only for temporary welding, and an annular pipe holder is fitted to each end of two pipes to be joined. , Each of the pipe holders is individually centered, and a part of each of these holders is connected by a bolt-shaped advance / retreat operating piece that acts as a nut, and both ends of the pipe body are tightened by screwing. After joining, the joining portion can be subjected to spot welding or partial linear welding work. In the case of the main welding, after the holders are removed, completely different welding devices are used. In the welding process.

[0005]

In the case where the ends of two pipes are welded to each other to form a fluid conduit, leakage from the connection portion is strictly prohibited. To make it a condition,
The welding operation was performed with the utmost skill and with the utmost care. Recently, these welding operations can be performed with uniform accuracy by semi-automation with a high-precision device, but when using this device, two of the objects to be welded were temporarily integrated by temporary welding. Otherwise, it is impossible to support the joining and maintain the joining accuracy, and the one with the connecting auxiliary material interposed cannot be applied to the automatic welding machine.

[0006] Based on such characteristics of the present welding apparatus,
Temporary welding was performed before the main welding operation step, and the main welding in a completely different step was performed on the workpiece to be integrally formed even in the temporary operation.

[0007] By performing these temporary welding, high accuracy is obtained in the main welding process, and easiness should be awarded only to the main welding. In some cases, difficult preparatory steps were required.

According to the present invention, in the conventional welding operation of the end portion of the tubular body, the temporary welding step, which was previously an indispensable operation, is omitted, and the welding holder can immediately enter the main welding step. It is intended to be able to provide.

[0009]

According to the present invention, as a means for achieving the above object, an annular body having a circular hollow portion is divided into a plurality of arc pieces, which are connected by a hinge member. At the open end, a tightening member is attached to form an annular body so that it can be freely formed and unfolded. Prepare two sets of a main pipe holder and a slave pipe holder with a steel pipe support member screwed into the screw hole. In the slave pipe holder, the individual arc pieces are extended on the diametrical extension line passing through the core of the hollow part. A connection hole parallel to the axis of the hollow portion is provided, and one end of the connecting rod is formed so that it can be inserted and removed and firmly fixed. In the main pipe holder, the connection relationship of the connection hole in the slave pipe holder Of the pressurized fluid A cylinder having a piston that operates by pulling is installed, the other end of the connecting rod is formed so as to be detachable from the piston rod, and a pressure fluid can pass through a connection projection protruding from an arc piece on which the cylinder is installed. The conduit is connected and opened, and a pressure flow generator prepared on the other side is formed so as to be detachable with a conduit, and a welding section can be mounted on a surface of the main pipe holder opposite to the slave pipe holder. In this way, the welding head in the welding section can rotate around the outer periphery of the steel pipe and inside the connecting rod, and the main pipe holder and the slave pipe holder can be assembled into a single body via the connecting rod. It becomes something.

[0010]

The connection between the existing steel pipe to be connected and the newly installed steel pipe is provided at a position where they are close to each other, a main pipe holder is attached to the pipe end of the existing steel pipe, and the pipe end of the other new steel pipe is provided. Is equipped with a slave pipe holder.

Both the main pipe holder and the slave pipe holder have the same basic form. That is, an annular body having a circular hollow portion in which an existing pipe and a new pipe can be contained is divided into a plurality of arc pieces and connected via a hinge member. A tightening member is provided, and a steel pipe support member pointing toward the core of the hollow portion is screwed to each of the arc pieces so that the tube can be freely advanced and retracted in the radial direction. Is formed.

In each of the pipe holders as described above, all the steel pipe support members are screwed in the outer circumferential direction of the arc piece, the fastening members are unlocked, and the pipe members are deployed around the hinge members.

In the main pipe holder, the pipe is surrounded at a predetermined position at the end of the existing pipe, and a fastening member is fastened and a steel pipe supporting member is screwed into the main pipe holder so that the axial position of the existing pipe and the axis of the hollow portion are aligned. The main pipe holder is firmly combined with the existing pipe so as to match as much as possible.

Since the main pipe holder is to be equipped with an automatic welding torch device on the surface in the direction of the pipe end, it is necessary to accurately mount the installation position of the steel pipe to be fixed to the pipe end.

In the slave pipe holder, the means for fixing the existing pipe and the main pipe holder are the same, and the slave pipe is fixedly mounted at a predetermined position at the end of the new pipe.

Next, one end of the connecting rod is fixed to a connecting hole provided at a corner of each arc piece of the slave pipe holder fixed to the new pipe, and the connecting rod is attached and detached during welding of the steel pipe. The main pipe holder, slave pipe holder,
The three main members of the connecting rod are housed separately, and
Even when each steel pipe is mounted, at least the main pipe holder and the slave pipe holder must be separate bodies.

Therefore, in the mounting operation, it is more convenient to use a single connecting rod until the necessity of the connection arises.

As described above, since it is a natural state that the connecting rod becomes a single unit when not used, it is essential that the connecting rod be detachable from each pipe holder. For example, it is necessary to maintain the connected state until the disassembly is performed, and it is important that the connection state is immobile especially when the slave pipe holder and the connecting rod are mounted.

There are a plurality of types of means for connecting and fixing the connecting rod to the slave pipe holder as in the embodiments described later, but all of the means are connected to the connecting holes provided on the slave pipe holder side. The dedicated end is inserted and fixed. Then, it can be separated again when the target work is completed.

When the connecting rod is fixed to the slave pipe holder fixed to the new pipe in this way, the other free end is connected to a coil spring at the guide post opening of the main pipe holder fixed to the existing pipe. After being inserted and surrounded by the internal piston rod, it is inserted continuously, and the previously inserted coil spring is sandwiched between the tip of the connecting rod and the outer surface of the cylinder connected to the guide post. Align the tip of the piston rod with the opening of the female screw hole that opens in the end face of the connecting rod, and apply a rotational movement to the head of the piston rod that protrudes from the other surface of the cylinder to move the piston rod into the connecting rod. Screwed into
The slave pipe holder and the main pipe holder are integrally connected via a connecting rod.

Next, a piston in the cylinder is moved by operating a pressure flow generator such as a hydraulic pump or the like and forcing a pressure fluid into the cylinder through a conduit.
The movement exerts a pulling action on the connecting rod via the piston rod.

In this way, the ends of the existing pipe on the main pipe holder side and the new pipe on the slave pipe holder side approach each other, and immediately before joining, the operation of the pressure flow generator is temporarily stopped. Carefully realign the two tube ends that are in close proximity. The adjusting means gives the steel pipe support member screwed to each of the arc pieces in each pipe holder to advance and retreat by screwing to each of the arc pieces, and it is a matter of course that face-to-face alignment of each pipe end opening portion, Adjust so that the core of each tube and the core of the hollow part in both pipe holders match.

This is because the alignment between the pipe holder and the pipe becomes a critical factor in the welding means described later.

In this manner, the facing pipe ends are aligned with each other,
If the alignment between each holder and the pipe is adjusted with high precision, the pressure flow generator is operated again to bring both pipe end faces into close contact. Then, this state is maintained until the welding operation is completed.

In the main pipe holder as described above, welding means having no direct relation to the constitutional requirements of the present invention is provided before the existing pipe is attached, and the joining operation with the new pipe is performed. Before, it is mounted at a position where it can be surrounded by the outer circumference of the existing pipe.

[0026] This welding means is provided by means of an adjustable mounting member which adjusts the running track of an annular body having the same axis as the axis of the hollow portion of the main pipe holder on the opposing surfaces of the slave pipe holder in the main pipe holder. A welding torch is mounted on the traveling rail via a torch holder capable of engaging and traveling. The welding torch performs a welding operation based on an external command and receives a reaction force on a workpiece to be welded. As a contact roller.

These welding torches are designed to be able to rotate on a circle having a radius smaller than the radius of the main pipe holder up to the set position of the connecting rod.

When the intended welding operation is completed in this way, the holder is disassembled in the reverse order of the above-described assembling steps.

[0029]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a welding holder according to the present invention; FIG. 2 is a perspective view of a welding holder according to the present invention; With the aid, basically two pipe holders and the two pipe holders are connected by a connecting rod, and the connecting rod is formed so as to be able to be pulled by one of the pipe holders, and An annular rail is provided on a side of the one pipe holder facing the other pipe holder so that a torch holder for a welding head can engage and travel inside the installation position of the connecting rod.

Although the basic shape of the two pipe holders is the same as described above, a difference occurs in terms of overall formation due to the attachment of the attached members.
The pipe attached to the new pipe B is called the main pipe holder 1 and the pipe attached to the new pipe B is called the slave pipe holder 2.

Since the main pipe holder 1 and the slave pipe holder 2 have basically the same shape, the description of the common parts will be shared below.

An annular body having a hollow portion 3 in which the existing pipe A and the new pipe B can be housed. Each of the pipe holders has two annular bodies so as to facilitate the attachment and detachment of the engaged pipe.
One end of each of the divided semicircular pieces 1a, 1b and 2a, 2b is pivotally connected to each other by a hinge member 4, and a fastening member 5 is attached to the other end thereof. It can be formed and deployed freely.

Further, these semicircular arc pieces 1a, 1b, 2
Each of a and 2b is formed of a bolt body which is formed with a plurality of internal thread holes penetrating inward and outward in the radial direction on a plurality of lines directed to the center point of the hollow portion 3, and which can be screwed into the internal thread holes. The steel pipe support member 6 is mounted.

Each of the plurality of steel pipe support members 6 is screwed into the hollow portion 3 from the outer circumferential direction of the pipe holder so that the tip portions can be brought into contact with the outer circumference of the steel pipe. 6, the position of the steel pipe to be engaged with the pipe holder can be set by the screwing depth, that is, the centering action and the fixing action are combined.
Further, a fixing piece 61 having a concave arc surface that matches the curvature of the outer peripheral surface of the steel pipe to which the tip abutment surface is to be locked is rotatably and pivotally attached to the tip of the bolt, whereby the joining surface with the steel pipe is connected. It is also arbitrarily possible to enhance the bonding effect by increasing.

In this manner, two semi-circular pieces 1a and 1b and one semi-circular piece 2a,
The use of 2b is as described above. Each of the semicircular pieces 1a, 1b and 2a, 2b is provided with a connecting portion for the connecting rod 7, but the main pipe is different due to the difference in the form of the connecting portion. It is separated into a holder 1 and a slave pipe holder 2.

Each semicircular piece 2 in the slave pipe holder 2
In a and 2b, a connection hole 8 is provided at a relatively large distance in the radial direction from the core of the hollow portion 3, and the connection hole 8 is formed so as to be parallel to the axis of the hollow portion 3. I do.

The connection hole 8 is formed by a cylindrical body 81 having a length larger than the thickness of the semicircular arc pieces 2a and 2b.
A male screw 82 is engraved on a part of the outer periphery in the one end direction, and the cylindrical body 81 is exposed in the fitting hole formed in the semicircular arc pieces 2a and 2b so that the male screw 82 is exposed. The connection holes 8 are formed by fixing the respective semicircular pieces 2a and 2b to the respective semicircular pieces 2a and 2b by welding means.

Another embodiment of the engagement hole 8 is as follows.
A female screw 83 is provided on the inner periphery of the cylindrical body 81 in correspondence with the connecting rod 7 described later.

Further, another embodiment of the engagement hole 8 is as follows.
A bolt insertion hole 85 is formed at the center of a cylindrical body 81 having a bottom 84, and the bottom 84 is set so as to be a non-opposing surface of the main pipe holder 1.

A connecting rod 7 connecting the main pipe holder 1 and the slave pipe holder 2 has one end inserted into a connection hole 8 provided in each of the arcuate pieces 2a and 2b of the slave pipe holder 2 to secure the connection. In this case, the other end is attached to a main pipe holder 1 described later.

The connecting rod 7 is a metal rod of a set length, one end of which is a dedicated end which is attached to the slave pipe holder 2 and the other end is attached to the main pipe holder 1.

There are a plurality of embodiments of the end structure of the connecting rod 7 corresponding to the plurality of embodiments in the connection hole 8 provided on the slave pipe holder 2 side.

In the first embodiment, the connecting rod 7 has the same length as the entire length of the cylindrical body 81 having the external thread 82 formed on the outer periphery of the engaging hole 8 or slightly smaller than the entire length.
An annular flange 71 protruding from the outer periphery of the annular flange 71 is protruded at a position interposed from one end of the upper end, and a through hole 72a that can be inserted from an end farther than the annular flange 71 is drilled at the top. And a concave portion 72b on the inside capable of locking the annular flange portion 71, and the cylindrical body 8
A flare nut-shaped guide post 72 provided with a female screw 72c that can be screwed into a male screw 82 on the outer periphery is engaged so that the annular flange 71 can be provided inside the recess 72b, and the slave pipe holder connection end 73 is connected. It is formed.

In another embodiment of the slave pipe holder connection end portion 73, a male screw 74 that can be screwed into a female screw 83 provided on the inner periphery of the cylinder 81 forming the connection hole 8 is engraved. It consists of

Further, the slave pipe holder connection end 73
According to another embodiment, a female screw hole 75 opening at the center of the end face is formed, and a bottomed portion 84 of a cylindrical body 82 forming a connection hole 8 is formed.
Bolt insertion hole 85 into which the locking bolt 76 is inserted from outside
And can be screwed into the female screw hole 75.

On the other hand, in the main pipe holder 1, in each of the semicircular arc pieces 1a and 1b, from the core of the hollow portion 3 to the axis of the engaging hole 8 in the slave pipe holder 2 from the core. The cylinder 9 is provided with the position at a distance equivalent to the separation distance as the axial position.

A male screw 91 is provided on the outer circumference of the cylinder 9 and is screwed into and engaged with a female screw threaded through the circular arc pieces 1a and 1b at the predetermined positions, and the guide post 10 is connected to the slave pipe. A part thereof is inserted so as to face the connection hole 8 in the holder 2, and the end face of the guide post 10 and the end face of the cylinder 9 are joined and fixed.

A piston 92 inside the cylinder 9 is fixed with a bolt-shaped piston rod 93 penetrating the cylinder 9, and its head is exposed outside the free end of the cylinder 9. In order to maintain the airtightness of the cylinder 9, a cap 94 is screwed to a male screw 91 on the outer periphery of the cylinder 9 protruding from the arc pieces 1a, 1b.
It is to be inserted into the guide post 10.

An insertion hole for pressurized fluid is formed in the side body of the cylinder 9, and a conduit opening to a conduit connecting projection 11 projecting from the outer surface of the arc-shaped pieces 1a, 1b matches the insertion hole. To communicate with a port that opens.

The above-mentioned conduit connection projection 11 is formed such that the distal end of a conduit 13 connected to a pressure flow generator 12 such as a hydraulic pump is detachable.

Further, the opening of the guide post 10 connected to the cylinder 9 is provided with the slave pipe holder 2.
The main pipe holder connecting end 77, which is the other end of the connecting rod 7, which is inserted into and engaged with the connecting hole 8 of the main pipe holder.

The connecting rod 7 to be inserted into the guide post 10 has a female screw hole 75 formed in the end face of the connecting end 77 of the main pipe holder along the axis thereof. The connecting rod 7 and the cylinder 9 are united by screwing a male screw projecting from the cylinder 9. The main pipe holder 1 on which the cylinder 9 is mounted and the connecting rod 7 are The attachment / detachment operation is performed for each welding operation of the body. Then, the main pipe holder connection end 77 for screwing the piston rod 93 is connected.
A compression type coil spring 14 is interposed between the end surface of the cylinder 9 and the outer surface of the cylinder 9 so as to surround the piston rod 93, and the operation of supplying the pressurized fluid to the cylinder 9 is pulled toward the main pipe holder 1 with respect to the connecting rod 7. It is possible to play only.

The main pipe holder 1 constructed as described above
In the above, the outer diameter of the existing pipe A is larger than the outer diameter of the existing pipe A on the opposing surface of the slave pipe holder 2 with a positional relationship such that it is located inside the cylinder 9 that operates the connecting rod 7 and outside the hollow portion 3. Running track 1 of annular body having inner diameter
5 are formed.

The running rail 15 made of the above-mentioned annular body
Is engaged with the torch holder 17 and the torch holder 1 is
A welding torch 18 is attached to 7 so that the outer periphery of the tube body can be rotated while performing welding work by the welding torch 18. The welding torch 18 is attached to the torch holder 17 including the traveling rail 15 and the welding holder 18. Since the present invention is out of the constituent requirements of the present invention, its details are omitted.

[0055]

As described above, the present invention relates to an operation for joining two pipes together by means of welding.
Conventionally, two pipe ends to be joined are temporarily welded to each other and subjected to welding means by a main welding machine. In this temporary welding operation, the two pipe ends to be joined are joined together with their cores aligned. The fixing and pulling of each pipe end and the joining operation were performed artificially using a holder called a welding holder used for this purpose, but in the present invention, the temporary welding work is performed as described above. Since the automatic welding mechanism can be attached to the holder part to be omitted and the two pipes can be pulled by the power, the on-site welding can be easily performed.

[0056]

[Brief description of the drawings]

Fig. 1 Front view of pipe end automatic welding holder

Fig. 2 Side view of automatic pipe end welding holder

FIG. 3 is an enlarged sectional view of a connection hole in a slave pipe holder.

FIG. 4 is an enlarged sectional view of a connection hole in a slave pipe holder according to another embodiment.

FIG. 5 is an enlarged sectional view of a connection hole in a slave pipe holder according to another embodiment.

FIG. 6 is an enlarged cross-sectional view of a connection state between a connection hole and a connecting rod in a slave pipe holder.

FIG. 7 is an enlarged sectional view of a connecting hole and a connecting rod in a slave pipe holder according to still another embodiment.

FIG. 8 is an enlarged cross-sectional view of a connection state between a connection hole and a connecting rod in a slave pipe holder according to still another embodiment.

FIG. 9 is an enlarged front view of a connecting rod.

FIG. 10 is an enlarged front view of a connecting rod according to another embodiment.

FIG. 11 is an enlarged front view of a connecting rod in still another embodiment.

FIG. 12 is an enlarged cross-sectional view of a cylinder portion of a main pipe holder. 1 main pipe holder 1a arc piece 1b arc piece 2 slave pipe holder 2a arc piece 2b arc piece 3 hollow hole 4 hinge member 5 fastening member 6 steel pipe support member 61 fixed piece 7 Connecting Rod 71 Annular Collar 72 Guide Post 72a Through Hole 72b Recess 72c Female Thread 73 Secondary Pipe Holder Connection End 74 Male Thread 75 Female Thread Hole 76 Locking Bolt 77 Main Pipe Holder Connection End 8 Connection Hole 81 Tube Body 82 Male screw 83 Female screw 84 With bottom 85 Bolt insertion hole 9 Cylinder 91 Male screw 92 Piston 93 Piston rod 94 Cap 10 Guide post 11 Conduit connection protrusion 12 Pressure generator 13 Conduit 14 Coil spring 15 Running rail 16 Mounting hole 17 Torch Holder 18 Welding torch Existing pipe B newly established tube

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Seiichiro Sakumi 382 Kamiyanagi-machi, Kushiro-mura, Nakakubijo-gun, Niigata Prefecture (56) References JP-A-5-131277 (JP, A) JP-A-59-66998 (JP, A) ) Japanese Utility Model Application Hei 6-86882 (JP, U) Japanese Utility Model Application Hei 5-70776 (JP, U)

Claims (1)

(57) [Claims] 1. An annular body having a circular hollow portion is divided into a plurality of arc pieces, which are connected by a hinge member, and a fastening member is attached to an open end to form an annular body and to form an unfolded body. Each of the arc pieces has a plurality of female screw holes that penetrate the inner and outer circumferences of the hollow portion in the radial direction, and a steel pipe support member is screwed into a plurality of female screw holes. Prepare a set, and for the slave pipe holder, provide a connection hole parallel to the axis of the hollow part on the diametrically extended line passing through the core of the hollow part for each arc piece, and insert and remove one end of the connecting rod A cylinder having a piston which is formed so as to be freely and firmly fixed, and which is operated in the main pipe holder by inserting and removing a pressurized fluid at a position where the installation relationship of the connection holes in the slave pipe holder is made equal. And the connecting rod The other end is formed so as to be detachable from the piston rod, and a connecting passage, which is formed on the arc piece on which the cylinder is installed, communicates with a connection passage through which a pressure fluid can pass, and is opened, and a pressure flow is prepared on the other side. And the vessel is formed so as to be detachable with a conduit, and a welding section can be mounted on a surface of the main pipe holder opposite to the slave pipe holder, and a welding head in the welding section is an outer periphery of the steel pipe, and Wherein the inner end of the connecting rod is rotatable, and the main pipe holder and the slave pipe holder are assembled into a single body via the connecting rod. For holder.