KR20240037537A - Clamping device for butt welding of pipes - Google Patents

Abstract

The present invention relates to a clamping device for butt welding of pipes, comprising: a clamp body having a flat surface formed on the inside and an arc formed on the outside; one end of the clamp body is respectively hinged at both ends and an arc is formed on the outside; It includes a clamp arm that pivots around a hinge, an actuator that is fixed to the flat surface of the clamp body and receives power to cause the rod to move in a straight line, and a link that is respectively hinged to the rod of the actuator and the other end of the clamp arm. A clamping device for butt welding of a featured pipe is disclosed.

Description

Clamping device for butt welding of pipes}

The present invention relates to a clamping device for butt welding of pipes, which can quickly and accurately align the center between pipes when butt welding two pipes, shortening the preparation time for welding and improving the quality of the welding. It concerns clamping devices.

In general, large, medium, and small diameter pipes are widely used in ship piping plant equipment and semiconductor equipment. Pipes, like the blood vessels of facilities, are used in various places with various functions, including protection of water, air, gas, and special substances required for all facilities, as well as flow paths for water and air.

Such pipes are generally pre-manufactured at a factory with a certain length, so to apply them to long or curved locations, several straight or curved pipes must be connected and welded together.

In the case of butt welding that connects two pipes, alignment work to adjust the level difference and gap between the pipes is essential to ensure welding quality before the welding process of the two pipes. In most cases, the welding target is Place the first and second pipes on a certain chock and use an existing general jig to visually check the four directions of the ends of the first and second pipes and repeatedly adjust them little by little in millimeter (mm) units. It's common.

However, as described above, when a worker uses an existing general jig to visually check alignment and adjust the gap, there is a significant difference in the basic time required as well as the additional time required depending on the worker's level of skill. This results in loss due to delay in work time.

In addition, damage to the surface of the pipe is inevitable due to the structural effects of a general jig, which may lead to quality defects, and there is a high risk of welding defects occurring due to imbalance in alignment.

Therefore, the alignment work for butt welding of two pipes must maintain a constant gap between the two pipes, and the welding work is performed while maintaining accurate concentricity to prevent height differences between the two pipes to be welded. It has to be.

For this purpose, in the past, in order to align the level difference between the two pipes and maintain a certain gap, existing general jigs were installed on both opposite ends of the two pipes and hand tools were used to adjust the level difference and gap between the two pipes. However, this was done by a skilled worker. If not, there is a problem that it is difficult to fit it accurately, it takes a lot of time even for skilled workers, and there is a problem that threatens the safety of workers during installation and disassembly due to structural effects and high weight.

KR 10-2021-0120818 A (2021.10.07)

The present invention is intended to solve the above problems, and is a clamping device for butt welding of pipes that can quickly and accurately align the center between pipes when butt welding two pipes, shorten the preparation time for welding, and improve the quality of welding. The purpose is to provide a device.

The technical idea of the present invention for achieving the above object is a clamp body having a flat surface formed on the inside and an arc formed on the outside, and one end of the clamp body is respectively hinged at both ends to form an arc on the outside. It includes a clamp arm that pivots around the hinge, an actuator that is fixed to the flat surface of the clamp body and receives power to move the rod in a straight line, and a link that is respectively hinged to the rod of the actuator and the other end of the clamp arm. This is achieved by a clamping device for butt welding of a pipe, characterized in that.

Here, the circular arc formed on the outside of the clamp body and the clamp arm preferably has the same curvature as the inner circular arc of the pipe or has a curvature smaller than this.

Additionally, it is preferable that buffering members are provided on the outside of the clamp body and the clamp arm, respectively.

In addition, it further includes guide wheels respectively provided on the front and back surfaces of the clamp body and the clamp arm, and the guide wheel is in contact with the inside of the pipe when the clamp body and clamp arm are inserted into the pipe to be butt welded. It is desirable to rotate with .

In addition, it is preferable that the guide wheel is connected to the rotation shaft of the drive motor and rotates by receiving power.

In addition, it is preferable to further include a pressing part that is respectively hinged to the clamp body and the clamp arm and presses the inside of the pipe when the clamp arm opens according to the linear movement of the rod.

In addition, the pressing portion preferably includes a lug that is hinged around a portion of the front and rear surfaces of the clamp body and the clamp arm, and a contact portion that is formed integrally with the lug and is located outside the clamp body and the clamp arm.

Additionally, it is preferable that the outside of the contact portion facing the inside of the pipe forms an arc.

In addition, it is preferable that the arc formed on the outside of the contact portion has the same curvature as the inner arc of the pipe or has a curvature smaller than this.

Additionally, it is preferable that a buffer member is provided on the outside of the contact portion.

In addition, the pressing part preferably has elastic members provided on both sides of the contact part with the lug as the center, and the elastic members are supported on the outside of the clamp body and the clamp arm, respectively, to exert elastic restoring force.

According to the clamping device for butt welding of pipes according to the present invention, when the other end of the clamp arm opens, the outside of the clamp body and the clamp arm presses against the inside of the pipe to be butt welded, thereby maintaining the gap between the pipes constant and creating a concentric circle. By aligning the centers of the two pipes quickly and accurately, the preparation time for welding is shortened, and welding is performed with the pipes aligned, improving the quality of the welding.

Figure 1 is a front view showing a first embodiment of a clamping device for butt welding according to the present invention.
Figure 2 is a front view showing the operation of the clamping device for butt welding according to the present invention.
Figures 3 and 4 are front and side views showing a second embodiment of the clamping device for butt welding according to the present invention.
Figures 5 and 6 are schematic diagrams showing the contact area of the inner surface of the pipe according to the first and second embodiments.
Figure 7 is an enlarged view showing a third embodiment of the clamping device for butt welding according to the present invention.

Terms and words used in this specification and claims should not be construed as limited to their usual or dictionary meanings, and the inventor may appropriately define the concept of terms to explain his or her invention in the best way. It must be interpreted as meaning and concept consistent with the technical idea of the present invention based on principles.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

Figure 1 is a front view showing a first embodiment of the clamping device for butt welding according to the present invention, and Figure 2 is a front view showing the operation of the clamping device for butt welding according to the present invention.

When described with reference to the drawings, the clamping device for butt welding of pipes according to the present invention includes a clamp body 100 inserted into the inside of the pipe to be butt welded, and hinges 110 fastened to both ends of the clamp body 100. Clamp arm 200, an actuator 300 that is fixed to the clamp body 100 and whose rod 310 moves linearly, clamp arm 200 and the rod 310 of the actuator 300 are connected to hinges 310 and 410. It consists of a fastening link 400, and when the actuator 300 operates, the clamp arm 200 opens toward the inside of the pipe (P) and presses the inside of the pipe (P) to be butt welded, thereby welding the pipe (P). The gap between the teeth is kept constant and the concentric circles are aligned.

To elaborate, the clamp body 100 is formed in the shape of a plate with a flat surface 101 formed on the inside and an arc formed on the outside. This clamp body 100 is the part where the two pipes (P) to be butt welded face each other. It is located on the inside of .

And, the clamp arm 200 is fastened to the hinge 110 at both ends of the clamp body 100. The clamp arm 200 has the shape of a plate forming a circular arc outward, and one end is attached to the end of the clamp body 100. and the hinge 110 are fastened to pivot at the end of the clamp body 100 around the hinge 110.

In this way, the circular arc formed on the outside of the clamp body 100 and the clamp arm 200, which pivot around the hinge 110, has the same curvature as the inner arc of the pipe P or has a curvature smaller than this, so that the clamp When the body 100 and clamp arm 200 are inserted into the inside of the pipe (P) to be butt welded and the clamp arm 200 is pivoted, the outside of the clamp body 100 and clamp arm 200 is connected to the pipe (P). This maximizes the contact area with the inner surface.

Meanwhile, an actuator 300 is installed on the flat surface 101 of the clamp body 100 to receive power and move the rod 310 in a straight line. The actuator 300 moves the rod 310 in a straight line by pneumatic or hydraulic pressure. It moves.

The link 400 is connected to the rod 310 of the actuator 300 and the other end of the clamp arm 200 with hinges 210 and 410, respectively. In this way, when the link 400 is connected to the rod 310 of the actuator 300 and the other end of the clamp arm 200 with the hinges 210 and 410, the actuator 300 operates and the rod as shown in FIG. 2 As (310) moves linearly, the link 400 pushes the other end of the clamp arm 200, and the clamp arm (200) is centered on one end of the clamp arm 200 connected to the end of the clamp body 100 and the hinge 110 200) pivots so that the other end opens outward.

In this way, as the other end of the clamp arm 200 opens, the outside of the clamp body 100 and the clamp arm 200 presses against the inside of the pipe (P) to be butt welded, thereby maintaining the gap between the pipes (P) constant. By aligning the concentric circles and aligning the centers of the two pipes (P) quickly and accurately, the preparation time for welding is shortened. Welding is performed with the pipes (P) aligned in this way, improving the quality of welding.

Meanwhile, buffer members may be provided on the outside of the clamp body 100 and the clamp arm 200, respectively. The buffer member is made of a material such as rubber and is attached along the outer surfaces of the clamp body 100 and the clamp arm 200.

When the buffer member is provided on the outer surface of the clamp body 100 and the clamp arm 200 in this way, the outer side of the clamp body 100 and the clamp arm 200 presses the inside of the pipe (P) to be butt welded. It can prevent scratches from occurring on the inside of the pipe (P), so not only does it not disturb the flow of fluid when it flows along the pipe (P), but it also prevents cracks in the pipe (P).

In addition, because friction is increased by the buffer member, the alignment between the two pipes (P) can be firmly supported in a solid state, thereby preventing welding defects that occur due to misalignment between the two pipes (P) during butt welding.

Meanwhile, when inserting the clamp body 100 inside the pipe (P), the movement of the clamp body 100 is adjusted so that the clamp body 100 is located inside the part where the two pipes (P) to be butt welded face each other. Guide wheels may be provided on the clamp body 100 and the clamp arm 200 to facilitate smooth operation. This will be explained based on Figures 3 and 4.

Figures 3 and 4 are front and side views showing a second embodiment of the clamping device for butt welding according to the present invention.

When described with reference to the drawings, guide wheels 500 are provided on the front and back surfaces of the clamp body 100 and the clamp arm 200, respectively. This guide wheel 500 is configured to rotate in contact with the inside of the pipe (P) when the clamp body 100 and the clamp arm 200 are inserted into the pipe (P) to be butt welded.

For this purpose, wheel brackets 600 are fixed to the front and rear surfaces of the clamp body 100 and the clamp arm 200, respectively, and a guide wheel 500 is installed on the wheel bracket 600 to clamp the clamp body 100 and the clamp arm 200. The clamp arm 200 is inserted inside the pipe (P) to facilitate movement of the clamp body 100 and the clamp arm 200 when moving to a portion where the two pipes (P) to be butt welded face each other.

At this time, the guide wheel 500 may be connected to the rotation axis of the drive motor so that the guide wheel 500 rotates by power provided from the drive motor. In this way, when the guide wheel 500 is configured to be rotated by the drive motor, when the length of the pipe (P) is long, the guide wheel 500 rotates by the power provided from the drive motor to clamp the clamp body 100 and the clamp arm. The movement of (200) can be facilitated.

Meanwhile, when the clamp arm 200 is pivoted from the clamp body 100 and opens to the inside of the pipe (P), the pressing force applied to the inside of the pipe (P) is transmitted evenly along the inner surface of the pipe (P). A pressing portion 700 may be provided on the clamp body 100 and the clamp arm 200 so that alignment between the pipes P can be quickly and accurately achieved.

That is, the pressing unit 700 is connected to the clamp body 100 and the clamp arm 200 with a hinge 730, respectively, as shown in FIGS. 3 and 4, and the clamp arm 200 moves the rod 310 in a straight line. When it opens, it puts pressure on the inside of the pipe (P).

This pressing portion 700 surrounds a portion of the front and rear surfaces of the clamp body 100 and the clamp arm 200 and is formed integrally with the lug 710 and the lug 710 fastened to the hinge 730, and is formed integrally with the clamp body ( 100) and a contact portion 720 located on the outside of the clamp arm 200.

At this time, the outside of the contact portion 720 facing the inside of the pipe P forms an arc. Preferably, the arc formed on the outside of the contact portion 720 has the same curvature as the inner arc of the pipe P. It has a smaller curvature than this.

As described above, when the pressing portion 700 pivoting on the outside of the clamp body 100 and the clamp arm 200 is provided, as shown in FIG. 6, when the clamp arm 200 opens inside the pipe (P) As the contact portion 720 of the pressing portion 700 pivots corresponding to the inside of the pipe P, the contact area between the inside of the pipe P and the contact portion 720 increases, and thus the pressure applied to the inside of the pipe P The force is transmitted equally to the entire inside of the pipe (P), allowing quick and accurate alignment between pipes (P).

That is, the clamp body 100 and the clamp arm 200 provided with the pressing portion 700 according to the second embodiment are similar to those of the pipe in the first embodiment shown in FIG. 5. As the contact area on the inside of the pipe (P) due to the contact portion 720 increases compared to the state in which it is in contact with the inside of the (P), the pressing force applied to the inside of the pipe (P) is evenly transmitted to the entire inside of the pipe (P). This ensures quick and accurate alignment between pipes (P).

Meanwhile, a buffer member may be provided on the outside of the contact portion 720. At this time, the buffer member provided on the outside of the contact portion 720 is made of a material such as rubber and is attached along the outer surface of the contact portion 720.

If a buffer member is provided on the outer surface of the contact part 720 in this way, it is possible to prevent scratches on the inside of the pipe P when the outside of the contact part 720 presses against the inside of the pipe P to be butt welded. When the fluid flows along the pipe (P), it not only does not disturb the flow of the fluid, but also prevents cracks in the pipe (P), and the alignment between the two pipes (P) is maintained by the friction force caused by the buffer member of the contact portion 720. It can be supported firmly, preventing welding defects caused by misalignment between the two pipes (P) during butt welding.

The clamping device for butt welding of pipes according to the present invention having the above configuration prepares for welding by quickly and accurately aligning the center between the pipes (P) on the inside of the pipe (P) when butt welding the two pipes (P). It shortens the time and improves the quality of welding.

Meanwhile, the present invention is not limited to the embodiments described above, but can be implemented with modifications and modifications without departing from the gist of the present invention, and such modifications and modifications should be considered to fall within the technical spirit of the present invention. .

For example, an elastic member 740 is provided in the pressing portion 700 so that an elastic restoring force is exerted on the pressing portion so that the contact portion tightly presses the inside of the pipe. This is explained based on FIG. 7.

Figure 7 is an enlarged view showing a third embodiment of the clamping device for butt welding according to the present invention. When described with reference to the drawings, the pressing portion 700 is provided with elastic members 740 on both sides of the contact portion 720 with the lug 710 as the center.

At this time, the elastic member 740 is supported on the outside of the clamp body 100 and the clamp arm 200, respectively, and is installed to exert elastic restoring force. In this way, when the elastic members 740 are located on both sides of the contact portion 720 with the lug 710 as the center, the pressing portion 700 is centered on the lug 710 due to the elastic restoring force exerted by the elastic member 740. This maintains a state where it is not eccentric to either side.

In this state, when the clamp body 100 and the clamp arm 200 are inserted into the pipe (P) and the clamp arm 200 opens inside the pipe (P), the contact portion 720 of the pressing portion 700 pivots correspondingly to the inside of the pipe (P).

At this time, the contact portion 720 is not eccentric to one side due to the elastic restoring force exerted by the elastic member 740, but presses the inside of the pipe (P), so that the pressing force applied to the inside of the pipe (P) presses the pipe (P). It is distributed evenly throughout the inside, allowing quick and accurate alignment between pipes (P).

100: Clamp body 101: Flat surface
200: Clamp arm 210,310,410,730: Hinge
300: Actuator 310: Rod
400: Link 500: Guide Wheel
600: Wheel bracket 700: Pressure part
710: Lug 720: Contact part
740: Elastic member

Claims (5)

A clamp body with a flat surface formed on the inside and an arc formed on the outside;
a clamp arm that is hinged at one end at both ends of the clamp body, forms an arc outward, and pivots around the hinge;
An actuator fixed to the flat surface of the clamp body and receiving power to cause the rod to move in a straight line; and
A clamping device for butt welding of a pipe, comprising: a link respectively hinged to the rod of the actuator and the other end of the clamp arm.
In claim 1,
A clamping device for butt welding of a pipe, characterized in that the arc formed on the outside of the clamp body and the clamp arm has the same curvature as the inner arc of the pipe or has a curvature smaller than this.
In claim 1,
A clamping device for butt welding of a pipe, characterized in that buffer members are provided on the outside of the clamp body and the clamp arm, respectively.
In claim 1,
It further includes a guide wheel provided on the front and back surfaces of the clamp body and the clamp arm, respectively,
The guide wheel is a clamping device for butt welding of a pipe, characterized in that when the clamp body and clamp arm are inserted into the pipe to be butt welded, the guide wheel rotates in contact with the inside of the pipe.
In claim 4,
A clamping device for butt welding of pipes, characterized in that the guide wheel is connected to the rotation axis of the drive motor and rotates by receiving power.