KR101642972B1 - Centering apparatus for welding of steel pipe - Google Patents

Centering apparatus for welding of steel pipe Download PDF

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Publication number
KR101642972B1
KR101642972B1 KR1020150135858A KR20150135858A KR101642972B1 KR 101642972 B1 KR101642972 B1 KR 101642972B1 KR 1020150135858 A KR1020150135858 A KR 1020150135858A KR 20150135858 A KR20150135858 A KR 20150135858A KR 101642972 B1 KR101642972 B1 KR 101642972B1
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KR
South Korea
Prior art keywords
plate
link plate
steel pipe
holder
sides
Prior art date
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KR1020150135858A
Other languages
Korean (ko)
Inventor
구광모
Original Assignee
화진테크주식회사
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Priority to KR1020150135858A priority Critical patent/KR101642972B1/en
Application granted granted Critical
Publication of KR101642972B1 publication Critical patent/KR101642972B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
    • B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
    • B23K37/053—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
    • B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
    • B23K31/022—Making profiled bars with soldered or welded seams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
    • B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
    • B23K37/053—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor
    • B23K37/0531—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor internal pipe alignment clamps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
    • B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
    • B23K37/053—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor
    • B23K37/0535—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor longitudinal pipe seam alignment clamps
    • B23K2201/06—

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)

Abstract

The present invention relates to a centering apparatus to weld steel pipes. Fixating plates (30, 300) are provided to be movable in mutually corresponding directions on both sides, to rotate link plates (40, 400) with a fixated shaft to be rotatable having one end connected to the fixating plates (30, 300). The link plates (40, 400) rotate to move clamping plates (50, 500) outward with a fixated shaft to be rotatable with other ends of the link plates (40, 400). The clamping plates (50, 500) are able to improve work efficiency, and reliability in an accurate welding by allowing an easy and stable centering.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a centering apparatus for welding steel pipes,

The present invention relates to a centering device for welding a steel pipe, and more particularly, to a centering device for welding a steel pipe, in which two steel pipes are simultaneously fixed in a concentric circle for butt welding of steel pipes, ≪ / RTI >

In general, the connection of the steel pipe is achieved through flange connection or butt welding.

The flange connection of the steel pipe is to connect the flanges integrally formed at the end of the steel pipe with each other by fastening the bolt and the nut, and such steel pipe connection is mainly performed directly on the field.

However, in order to manufacture the flange-type steel pipe, the flange must be connected to the end of the steel pipe. In order to obtain the steel pipe having the desired length, the pipe and the pipe must be connected to each other by welding.

In order to perform butt welding between the steel pipe and the flange and the ends of the steel pipe and the steel pipe, there are provided roller means for supporting the steel pipe or the flange at the lower portion of the outer circumferential surface thereof while rotating them, .

At this time, the steel pipe, the flange, or the steel pipe and the steel pipe must be located on the same center line, but most of them are still located at the same center by the snow poles or by the height adjustment of the roller means in which the steel pipe is placed.

In the registered patent No. 1432625 (2014.08.14, 2014, name of jointing method of steel pipe), it is inserted into the steel pipe of both sides so as to be inserted into the inner diameter of each steel pipe, and the reinforcing plate is joined by welding. The tensile material is connected between the plurality of holes formed at regular intervals, so that the welding can be performed along the end portion where the steel pipes on both sides are in close contact with each other on the same center line.

In this conventional technique, a reinforcing plate having an outer diameter equal to the inner diameter of a steel pipe is fixed by welding in each steel pipe, and then the reinforcing steel plates are connected to each other using a tensile material. And welding is performed between these end portions so that the steel pipes on both sides are rotated at the same time.

However, after the steel pipes are connected by welding, the troublesome work of separating the reinforced plates welded from the inside of the steel pipes must be performed, and the time required for such separating operations is long and the working efficiency is deteriorated.

Patent No. 1432625 (Apr. 14, 2014)

It is a primary object of the present invention to provide a centering device for welding a steel pipe, which allows a pair of steel pipes to be more easily and accurately fixed on the same center line while closely adhering to each other.

It is another object of the present invention to provide a centering device for welding a steel pipe, which enables precise welding to be performed by allowing centering to be performed with respect to a relatively thin steel pipe.

Particularly, it is another object of the present invention to provide a centering device for welding a steel pipe, which can simplify connection between a steel pipe and a flange.

In order to accomplish the above object, the present invention provides a centering device for welding a steel pipe, the centering device for welding a steel pipe comprising: a rotating shaft for forming threads at opposite pitches on outer circumferential surfaces; A nut holder threadably coupled to the threaded portion of the rotating shaft; A plurality of fixing plates radially fixed to outer circumferential surfaces of the nut holders on both sides; A link plate rotatably supported at both ends of the outer side of the stationary plate on both sides so as to be rotatable in mutually opposite directions; The other end of the link plate is rotatably fixed to both ends of the link plate, the outer end of the clamp plate is rotatably fixed to the outer end of the link plate so that a part of the outer circumferential surface of the link plate is rotatable; A bearing holder rotatably fixed on one end of the rotary shaft; A first connection link plate rotatably and axially coupled at both ends of the bracket to extend radially from the outer periphery of the bearing holder and at a shaft coupling portion between the link plate and the clamping plate on the bearing holder side; A second connecting link plate having both ends thereof rotatably and axially coupled to each other at an axially connecting portion between a stationary plate and a link plate adjacent to each other and with an axially connecting portion between the link plate and the clamping plate; And a rotating means which is connected to an end portion of a rotating shaft passing through the bearing holder and extending in the axial direction so as to rotate the rotating shaft.

In the above configuration, the fixing plate is provided at 3 to 6 in a uniform angle on the outer peripheral surface of the nut holder.

The rotation means may be configured such that one end of the rotation means is coupled to one end of the rotation shaft and the other end of the connection rod extending linearly with a predetermined length is connected to a handle capable of being rotated by manual operation, And a motor capable of rotating in the forward and reverse directions can be connected.

Further, the centering device for welding a steel pipe of the present invention comprises: a pair of cylinders, one end of which is fixed to one end and the other end of which receives a piston rod in a direction corresponding to each other; A holder in which a piston rod end portion of a cylinder is integrally coupled to a closed side end face of a cylindrical cylinder which is opened to one side while enclosing an outer diameter of the cylinder and is linearly reciprocated in a direction corresponding to each other by driving each cylinder; A plurality of fixing plates radially fixed to an outer peripheral surface of the holder; A link plate rotatably supported at both ends of the outer side of the stationary plate on both sides so as to be rotatable in mutually opposite directions; The other end of the link plate is rotatably fixed to both ends of the link plate, the outer end of the clamp plate is rotatably fixed to the outer end of the link plate so that a part of the outer circumferential surface of the link plate is rotatable; A connecting plate rotatably fixed at one end to a shaft coupling portion between the link plate and the clamping plate adjacent to each other at both sides and the other end rotatably fixed to a connecting bracket connecting the cylinders on both sides; A hydraulic pump for supplying hydraulic pressure to the cylinders on both sides, a controller for interrupting driving of the hydraulic pump, and an oil tank for supplying oil to the hydraulic pump.

The centering device for welding a steel pipe according to the present invention comprises a steel pipe and a steel pipe which are brought into close contact with each other while the clamping plate is opened outward by a link plate rotating opposite to each other at opposite sides of the steel pipe and the steel pipe and the flange are uniformly adhered along the same vertical line- So that it can be fixed more easily and accurately on the same center line.

In addition, since the end portions of relatively thin steel pipes are formed as ellipses deformed at the source, the centering can be achieved with a precise origin.

1 is a perspective view illustrating an embodiment of a centering device for welding a steel pipe according to the present invention;
Fig. 2 is a front view of Fig. 1
Fig. 3 is a front view of the use state of the centering device for welding steel pipes according to one embodiment of the present invention
4 is a side sectional view of the centering device for welding steel pipes according to an embodiment of the present invention,
5 is a front sectional view illustrating another embodiment of the centering device for steel pipe welding according to the present invention.
Fig. 6 is a front view of Fig. 5
Fig. 7 is an exemplary view showing the inter-cylinder connection structure in the centering device for welding steel pipes according to the present invention
8 is a front view of a state of use in which a centering device for welding a steel pipe according to another embodiment of the present invention is used

Hereinafter, a preferred embodiment of a centering apparatus for welding a steel pipe according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view illustrating an embodiment of a centering device for welding a steel pipe according to the present invention, and FIG. 2 is a side view of FIG. 1. FIG.

As shown in the drawings, the centering device for welding steel pipes according to the present invention includes a rotary shaft 10, a nut holder 20, a fixing plate 30, a link plate 40, a clamping plate 50, a bearing holder 60, 1 connecting link plate 70, a second connecting link plate 80, and a rotating means 90. [

In the present invention, the rotary shaft (10) has a configuration in which a thread forming portion (11) formed with threads at pitches opposite to the outer peripheral surface is formed to be spaced apart from a certain length.

The nut holder 20 is screwed to the screw thread forming portion 11 of the rotary shaft 10 so that a plurality of fastening plates 30 are radially formed on the outer circumferential surface of the nut holder 20 at a uniform angle .

It is most preferable that the number of the fixing plates 30 provided in the nut holder 20 is three to six.

At this time, the fixing plate 30 is formed to have a trapezoidal shape which is formed so as to have a constant width extending outwardly and gradually extended outward from an end fixed to the nut holder 20.

It is more preferable that the fixing plate 30 formed on the outer peripheral surface of the nut holder 20 is integrally formed by welding.

One end of a pair of link plates 40 is fixed to both fixing ends of the fixing plate 30 integrally formed with the nut holders 20 on both sides which are respectively threaded to the thread forming portions 11 of the rotary shaft 10 Respectively.

At this time, the link plates 40 on the both sides of the fixing plate 30 are formed to be inclined in opposite directions, and a pair of link plates 40 on both sides are rotatably fixed to both ends of the clamping plate 50 .

That is, a pair of link plates 40, one end of which is fixed to the stationary plate 30 on both sides, are arranged such that the distance between the end portions of the link plate 40 connected to the stationary plate 30 is longer than the distance between both ends of the clamping plate 50 And the other ends of the pair of link plates 40 are axially fixed to the same length.

Therefore, the link plates 40 on both sides are formed to be inclined in opposite directions.

On the other hand, the link plate 40 is formed to have a length according to the inner diameter of the steel pipe to be applied.

In addition, the clamping plate 50 is in close contact with the inner circumferential surface of the actual steel pipe, and the roller 51 is axially fixed to the clamping plate 50 so that a part of the outer circumferential surface protrudes from the middle end thereof.

The rollers 51 fixed to the respective clamping plates 50 are configured to contact the inner circumferential surface of the steel pipe so as to move along the steel pipe.

The bearing holder (60) of the present invention is rotatably fixed to one end of the rotary shaft (10), and the bearing holder (60) is prevented from moving in the axial direction.

The first connection link plate 70 is connected to the end of the bracket 61 so as to extend radially from the outer periphery of the bearing holder 60 and to the end of the axial coupling between the link plate 40 and the clamping plate 50 adjacent to the bearing holder 60. [ So that both end portions are rotatably and axially coupled to each other.

The movement distance of the clamping plate 50 is limited by the first connection link plate 70.

On the other hand, the distance between the nut holders 20 on both sides is limited by the second connection link plate 80.

To this end, the second connection link plate 80 is fixed to the fixing plate 30 at one link plate 40 of the adjacent two link plates 40 adjacent to each other at mutually adjacent link plates 40, And both end portions of the link plate 40 are fixed to the clamping plate 50 so as to be rotatable.

However, it is more preferable that the second connection link plate 80 is formed in a curved shape rather than a straight shape.

The rotary shaft 90 of the present invention is provided to rotate the rotary shaft 10. To this end, the rotary shaft 10 extends through the bearing holder 60 and extends a certain length in the axial direction, And the rotation means 90 is connected to such an extending end.

The rotation means 90 includes a connecting rod 91 and a connecting rod 91 which are connected to one end of the connecting rod 91 such that one end of the connecting rod 91 extends through the bearing holder 60 of the rotating shaft 10, (Not shown) for rotating the connecting rod 91 by manual operation at the end or a motor (not shown) capable of rotating in the forward and reverse directions is connected.

At this time, the connection rod 91 connected to the rotary shaft 10 may be formed in accordance with the length of the steel pipe, but may be formed to have a plurality of numbers so as to be able to extend along the length of the steel pipe, It is possible.

In this embodiment, the connecting rod 91 is connected to one end of the rotating shaft 10 so that the rotating shaft 10 can be rotated. Therefore, the length of the connecting rod 91 is limited, It is not suitable for connecting long steel pipes.

Therefore, the present embodiment is suitable for connecting relatively short steel pipes or connecting flanges to steel pipes.

3, the rotating shaft 10 is rotated so that the rollers 51 supported by the respective clamping plates 50 are supported by the inner peripheral surface of the steel pipe SP, .

At this time, the roller (51) is kept to a degree that allows the rolling movement to be close to the inner circumferential surface of the steel pipe (SP), and the steel pipe (SP) and the steel pipe (SP) Make sure that you reach a certain area.

The clamping plates 50 on both sides are positioned on the steel pipes SP on both sides and the rotating shaft 10 is rotated by using the connecting rod 91 again so that the rollers 51 of the respective clamping plates 50 So that the inner circumferential surface of the double-sided steel pipe SP is uniformly pushed outward more strongly.

When the steel pipe SP is uniformly pushed outwardly by the rollers 51, the steel pipe SP having a relatively thin thickness as shown in FIG.

When the steel pipe (SP) is precisely centered, the welding efficiency is further improved, thereby greatly improving the work efficiency and reliability.

When the welding is performed and the steel pipes SP are connected to each other, the rotating shaft 10 is rotated by the operation of the connecting rod 91 so that the rollers 51 which are firmly adhered to the inner circumferential surface of the steel pipes SP are made rollable, If the rod 91 is pulled out and taken out to one side of the steel pipe SP, it can be easily separated.

In the meantime, the above-described embodiment is limited to the length of the connecting rod 91, so that it is mainly used when a flange is connected to a relatively short length steel pipe SP or a steel pipe SP, The oil pressure is applied to the steel pipe SP.

5 is a front sectional view illustrating another embodiment of a centering apparatus for welding a steel pipe according to the present invention, and Fig. 6 is a side view of Fig.

As shown in the drawing, the present embodiment includes a cylinder 100, a holder 200, a fixing plate 300, a link plate 400, a clamping plate 500, a connecting link plate 600 and a hydraulic pressure supply means 700 .

The pair of cylinders 100 in the present embodiment are arranged in a direction corresponding to each other. The pair of cylinders 100, in which the piston rod 110 is pulled out in a direction corresponding to each other, And fixed by the bracket 120.

However, the brackets 120 are formed to have a constant width so that both ends are integrally fixed to one end of the cylinder 100.

The cylinders 100 on both sides are covered by the cylindrical holder 200.

In other words, the holder 200 has a cylindrical shape with one side open, and the inner diameter of the holder 200 is larger than the outer diameter of the cylinder 100, So that the end of the rod 110 is integrally coupled to the other side corresponding to one side opened in the holder 200.

At this time, the end of the piston rod 110 may be directly coupled with the side surface of the holder 200, but a wider area of the reinforcing plate 130 may be joined to the end of the piston rod 110, (130) can be integrally coupled with the inner surface of the holder (200).

Meanwhile, the cylindrical reinforcing plate 130 is integrally coupled to the side surface of the holder 200, thereby fixing the holder 200 to the cylinder 100.

Accordingly, the holder 200 moves linearly in the direction and distance in which the piston rod 110 is moved by the driving of the cylinder 100.

A plurality of fixing plates 300 are coupled to the cylindrical holder 200 in the longitudinal direction on the outer circumferential surface.

The plurality of fixing plates 300 are formed at an equal angle along the outer diameter of the outer circumferential surface of the holder 200. The number of the fixing plates 300 is preferably 3 to 6.

The plurality of fixing plates 300 provided along the main surface of the holder 200 are radially arranged such that the plate surfaces extend outside by a predetermined width, and the fixing plates 300 are spaced apart by the same angle.

One end of the fixing plate 300 is integrally fixed to the holder 200 and one end of the link plate 400 is rotatably fixed to the plate surface on both sides of the other end of each of the fixing plates 300. [

One end of a pair of link plates 400 is rotatably mounted at both ends of the fixing plate 300 while the other end is rotatably fixed to both ends of the clamping plate 500.

At this time, the distance that the pair of link plates 400 supported by the pair of link plates 400 on the fixing plate 300 is equal to the distance that the pair of link plates 400 are supported by the clamping plate 500, .

However, it is more preferable that the pair of link plates 400 are inclined from the one end of the fixed plate 300 to the outer plate symmetrically with respect to the outer plate.

A clamping plate 500 for axially fixing the pair of link plates 400 at both ends is rotatably supported at a position close to the stationary plate 300 while rotating about an end of the link plate 400 which is axially fixed to the stationary plate 300 To the outside.

At this time, the roller 510 is rotatably fixed to the outer end of the middle of the length of the clamping plate 500 such that a part of the outer circumferential surface protrudes outward.

7, the brackets 120 connecting the cylinders 100 are integrally fixed to one end of the cylinders 100, and a plurality of the brackets 120 are radially arranged in the same manner as the stationary plates 300 on both sides At this time, the inner ends of the brackets 120 are radially provided along the outer circumferential surface of the circular plate or ring-shaped gap plate 1200 which is tightly fixed between the ends of the cylinder 100.

Accordingly, a part of the both ends of the bracket 120 is fixed to the outer circumferential surface of each cylinder 100, and the gap between the cylinders 100 is fixed by the gap plate 1200.

It is more preferable that the bracket 120, the gap plate 1200, and the cylinder 100 are integrally joined by welding.

Each of the pair of connection link plates 600 has one end rotatably fixed to a plurality of brackets 120 radially formed along the outer circumferential surface of the gap plate 1200, And the other end is rotatably and axially fixed at an end fixed to the adjacent link plate 400 of both the clamping plates 500.

At this time, the connection link plate 60 may be linearly formed in the longitudinal direction, but may be curved outwardly.

On the other hand, each cylinder 100 is controlled to be intermittently controlled by the hydraulic pressure supply means 700.

The hydraulic pressure supply means 700 of the present embodiment again includes a hydraulic pump (not shown) for supplying hydraulic pressure to the cylinders 100 on both sides, a controller (not shown) for interrupting the drive of the hydraulic pump, (Not shown) filled with oil at a constant flow rate.

At this time, a certain hydraulic pressure is supplied to the cylinders 100 on both sides by the hydraulic pump, and the driving of the hydraulic pump is controlled by the controller. The controller interrupts the driving of the hydraulic pump by the hydraulic pressure supplied to the cylinder 100.

Further, oil is supplied from the oil tank to the hydraulic pump.

8, the centering device for welding a steel pipe according to the present embodiment is inserted into one end of a steel pipe SP of a pair of steel pipes SP which are brought into close contact with each other as shown in FIG. 8, The piston rod 110 is drawn out from the cylinder 100 on both sides and moves the holder 200 at the same time.

In other words, when the holder 200 connected to the piston rod 110, which is drawn out from the cylinders 100 in mutually opposite directions, moves to a predetermined length on both sides, the fixed plate 300 integrally coupled to the holder 200 is simultaneously So that one end of the link plates 400, one end of which is rotatably fixed to the fixed plate 300, is moved.

When the link plates 400 are linearly moved together with the fixing plate 300, the clamping plate 500 connected to the other end of the link plates 400 is also required to linearly move. However, in the clamping plates 500 on both sides, One end is fixed at the shaft fixing position with respect to the plate 400 and the other end is not linearly moved by the connection link plate 600 which is pivotally supported by the bracket 120 between the cylinders 100. Therefore, The link plate 400 is gradually raised by the movement.

The roller 510 formed on the clamping plate 500 comes into contact with the inner circumferential surface of the steel pipe SP when the forming angle of the link plate 400 is raised in the radial direction.

After the roller 510 is brought into contact with the inner circumferential surface of the steel pipe SP, the centering device of the present embodiment is pushed by a separate tool to be positioned at the portion where the end-to-end steel pipes SP are in close contact with each other.

Accordingly, while the pair of steel pipes SP are simultaneously supported on the clamping plates 500 on both sides, the repulsive force of the supply oil pressure is checked through each cylinder 100 so that the hydraulic pressure is supplied at an appropriate pressure.

The rollers 510 fixed to the respective clamping plates 500 are closely attached to the inner circumferential surface of the steel pipe SP by the hydraulic pressure supplied again so that the steel pipes SP on both sides are located on the same center line.

The welding operation can be performed uniformly by making the end portions closely contact with each other on the same center line, so that the working efficiency and reliability can be further enhanced as in the above embodiment.

Particularly, since it is possible to precisely carry out centimeters between the steel pipes SP by a simple operation and control that is merely inserted from one steel pipe SP and moved to a part in contact with the end of the steel pipe SP, .

Also, in this embodiment, as in the above-described embodiment, the end portion of the relatively thin steel pipe SP is made to be a true circle, so that the end portion can be accurately coupled.

10: rotating shaft 11: thread forming portion
20: nut holder 30: stationary plate
40: Link plate 50: Clamping plate
51: roller 60: bearing holder
70: first connection link plate 80: second connection link plate
90: rotating means 100: cylinder
110: Piston rod 200: Holder
300: Fixing plate 400: Link plate
500: clamping plate 510: roller
600: connecting link plate 700: hydraulic supply means

Claims (6)

A rotating shaft for forming a thread on the outer circumferential surface of both sides at a pitch in the opposite direction;
A nut holder threadably coupled to the threaded portion of the rotating shaft;
A plurality of fixing plates radially fixed to outer circumferential surfaces of the nut holders on both sides;
A link plate rotatably supported at both ends of the outer side of the stationary plate on both sides so as to be rotatable in mutually opposite directions;
The other end of the link plate is rotatably fixed to both ends of the link plate, the outer end of the clamp plate is rotatably fixed to the outer end of the link plate so that a part of the outer circumferential surface of the link plate is rotatable;
A bearing holder rotatably fixed on one end of the rotary shaft;
A first connection link plate rotatably and axially coupled at both ends of the bracket to extend radially from the outer periphery of the bearing holder and at a shaft coupling portion between the link plate and the clamping plate on the bearing holder side;
A second connecting link plate having both ends thereof rotatably and axially coupled to each other at an axially connecting portion between a stationary plate and a link plate adjacent to each other and with an axially connecting portion between the link plate and the clamping plate;
Rotating means for rotating the rotating shaft by connecting to an end of a rotating shaft passing through the bearing holder and extending in the axial direction;
And a centering device for welding the steel pipe.
The method according to claim 1,
Wherein the fixing plate is provided at 3 to 6 in a uniform angle on the outer peripheral surface of the nut holder.
The method according to claim 1,
Wherein the rotating means is connected to one end of the rotating shaft by one end and the other end of the connecting rod linearly extending by a predetermined length is connected to a handle capable of rotating by manual operation or a motor capable of normal and reverse rotation.
A pair of cylinders, one end of which is fixed, and the other end of which has a piston rod pulled out in a direction corresponding to each other;
A holder in which a piston rod end portion of a cylinder is integrally coupled to a closed side end face of a cylindrical cylinder which is opened to one side while enclosing an outer diameter of the cylinder and is linearly reciprocated in a direction corresponding to each other by driving each cylinder;
A plurality of fixing plates radially fixed to an outer peripheral surface of the holder;
A link plate rotatably supported at both ends of the outer side of the stationary plate on both sides so as to be rotatable in mutually opposite directions;
The other end of the link plate is rotatably fixed to both ends of the link plate, and the outer end of the clamp plate is rotatably fixed to the outer end of the link plate so that a part of the outer circumferential surface of the link plate is rotatable;
A connecting link plate rotatably fixed to a shaft coupling part between a link plate and a clamping plate which are adjacent to each other on both sides and whose other end is rotatably fixed to a connecting bracket connecting cylinders on both sides;
A hydraulic pressure supply means including a hydraulic pump for supplying hydraulic pressure to the cylinders on both sides, a controller for interrupting driving of the hydraulic pump, and an oil tank for supplying oil to the hydraulic pump;
And a centering device for welding the steel pipe.
The method of claim 4,
The gap between the cylinders is integrally joined by a disc plate or a ring-shaped gap plate. A plurality of brackets are integrally connected to the outer circumferential surface of the gap plate so as to radially protrude radially, Side ends are integrally connected to the outer circumferential surface of the cylinder partly by welding.
The method of claim 4,
Wherein the fixing plate is provided at a uniform angle of 3 to 6 on the outer peripheral surface of the holder.
KR1020150135858A 2015-09-24 2015-09-24 Centering apparatus for welding of steel pipe KR101642972B1 (en)

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CN109551165A (en) * 2018-12-28 2019-04-02 无锡圣唐液压成型精密钢管有限公司 High-strength accurate tube-welding device
CN109590629A (en) * 2019-01-23 2019-04-09 浙江青山钢管有限公司 A kind of Multifunctional welding tube apparatus
CN110394592A (en) * 2019-06-04 2019-11-01 安徽管益生新材料科技有限公司 A kind of stainless steel pipe weld seam support device
CN114012330A (en) * 2021-11-30 2022-02-08 青岛嘉恒新能源设备有限公司 Inner and outer circular seam welding equipment for large steel pipe connecting flange
CN114939768A (en) * 2022-06-06 2022-08-26 国家石油天然气管网集团有限公司 Pipeline external aligning device with rolling positioning function
CN115476110A (en) * 2022-10-11 2022-12-16 山东方大新材料科技有限公司 Positioning device for processing oil field conveying pipeline and using method thereof
KR20230111336A (en) * 2022-01-18 2023-07-25 한전케이피에스 주식회사 Centring apparatus for water wheel and turbin shaft

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JPS62197300A (en) * 1986-02-21 1987-08-31 Mitsubishi Heavy Ind Ltd Tack straightening device for steel pipe
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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109551165A (en) * 2018-12-28 2019-04-02 无锡圣唐液压成型精密钢管有限公司 High-strength accurate tube-welding device
CN109590629A (en) * 2019-01-23 2019-04-09 浙江青山钢管有限公司 A kind of Multifunctional welding tube apparatus
CN110394592A (en) * 2019-06-04 2019-11-01 安徽管益生新材料科技有限公司 A kind of stainless steel pipe weld seam support device
CN114012330A (en) * 2021-11-30 2022-02-08 青岛嘉恒新能源设备有限公司 Inner and outer circular seam welding equipment for large steel pipe connecting flange
KR20230111336A (en) * 2022-01-18 2023-07-25 한전케이피에스 주식회사 Centring apparatus for water wheel and turbin shaft
KR102579290B1 (en) * 2022-01-18 2023-09-14 한전 케이피에스 주식회사 Centring apparatus for water wheel and turbin shaft
CN114939768A (en) * 2022-06-06 2022-08-26 国家石油天然气管网集团有限公司 Pipeline external aligning device with rolling positioning function
CN114939768B (en) * 2022-06-06 2024-06-04 国家石油天然气管网集团有限公司 Pipeline external aligning device with rolling positioning function
CN115476110A (en) * 2022-10-11 2022-12-16 山东方大新材料科技有限公司 Positioning device for processing oil field conveying pipeline and using method thereof

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