KR102243595B1 - Clamping system for welding pipe-line and method thereof - Google Patents

Abstract

The present invention provides a clamping device and a clamping method thereof. The clamping device comprises: a body inserted into a pipe and an elbow; a fixing piston installed along the circumference of the body, abutting the inner surface of the elbow and the pipe to fix the body, and including a head having a reference line; a joint part piston installed along the circumference of the body on a lower portion of a joint part where the pipe and the elbow meet, and including a head having a reference line; a spacer having a reference line and a thickness equal to a gap to be maintained between the pipe and the elbow at the joint part; and a spacer fixing part which is installed on the head of the joint part piston and to which the spacer is coupled. For welding purposes, the center of the pipe and the elbow are coincident. The clamping device for pipe welding of the present invention can maintain parallelism at a contact surface of the elbow and the pipe without tack weld when welding the pipe and the elbow, and can match the center of the pipe and the elbow, thereby improving the welding quality. In addition, continuous welding is possible by sequentially shrinking the spacer, used to maintain the gap between the pipe and the elbow during welding, according to the welding progress, such that welding productivity is increased.

Description

Clamping system for welding pipe-line and method thereof

The present invention relates to welding of a joint portion of a piping member.

In conventional pipe welding, a clamping device was used for pipe-to-pipe welding. After aligning the two pipes to be connected, it was necessary to fix the position by temporary welding in order to maintain the gap between the contact surfaces of the two pipes. In addition, when welding a pipe to an elbow, it was difficult to align the center or to maintain an exact gap between the pipe and the elbow.

Existing clamping devices used for conventional pipe welding have a straight line and a curved surface in an integrated form according to the shape of the pipe member to be welded, and sufficient clearance is required to insert the curved elbow, so the curved elbow and the straight line When contacting the pipe, it is difficult to maintain the parallelism at the contact surface between the elbow and the pipe, and it is difficult to match the center of the pipe and the elbow. In addition, in order to maintain the gap between the pipe and the elbow during welding, the spacer must be manually inserted/detached, and after welding, it is difficult to remove due to compression by the welding contraction force.

The clamping device of the present invention illustrated (see FIG. 1) includes a body inserted into the pipe and the elbow; A fixing piston installed along the circumference of the body, fixing the body by contacting the inner surface of the pipe and the elbow, and including a head having a reference line; A joint piston installed along the circumference of the body below the joint where the pipe and the elbow meet, and including a head having a reference line; And a spacer having a thickness and a reference line equal to the thickness of the gap to be maintained between the pipe and the elbow at the joint; and a spacer fixing part installed on the head of the joint piston and to which the spacer is coupled; and a pipe for welding. And the center of the elbow (see Fig. 2).

The clamping device of the present invention illustrated (see FIG. 3) further includes a device for generating a signal when the device for performing welding approaches the spacer connected to the head of the joint piston, and the spacer is It is characterized in that it is sequentially contracted below the junction.

In the clamping device of the present invention illustrated (see FIGS. 3, 9, and 10), the shape of the fixing piston head is a curved surface that matches the inner surface of the pipe or elbow that the head contacts, and two or more pistons are It is characterized in that the head is in close contact with the inner surface of the pipe or the elbow by operating at the same time to match the center line and the angle of the pipe and the elbow.

The clamping device of the present invention illustrated (refer to FIGS. 4 to 8 and 3) is characterized in that the spacer is replaced with the spacer fixing part by being replaced according to the thickness of the gap required in the joint part.

The clamping method of the present invention illustrated (refer to FIGS. 4 to 8 and 3) includes the steps of displaying a reference line on upper surfaces of the pipe and the elbow;

In the clamping device to match the center of the pipe and the elbow for welding,

A body inserted into the pipe and the elbow,

A fixing piston installed along the circumference of the body, fixing the body by contacting the inner surface of the pipe and the elbow, and including a head having a reference line,

A joint piston piston installed along the circumference of the body below the joint where the pipe and the elbow meet, and including a head having a reference line,

A spacer having a thickness and a reference line equal to the gap to be maintained between the pipe and the elbow at the junction,

Aligning the reference line of the clamping device installed on the head of the joint piston and including a spacer fixing part to which the spacer is coupled with the reference line of the pipe;

Installing a spacer having a reference line and a thickness equal to the gap to be maintained between the pipe and the elbow at the spacer fixing portion of the joint piston head;

Contracting the piston by removing pressure from a cylinder that moves the piston of the clamping device;

Placing the clamping device in the pipe and aligning the reference line of the clamping device and the reference line of the pipe to match;

When one end of the pipe is in close contact with the spacer, supplying pressure to the pipe piston to make the fixing piston head in close contact;

Inserting the elbow from the bottom of the body to be inserted into the elbow and aligning the elbow so that the reference line of the upper surface of the elbow coincides with the reference line of the spacer;

Expanding the fixing piston of the body inserted into the elbow so that the piston head is in close contact with the inner surface of the elbow; and

When welding along the joint while the pipe and the elbow are fixed, the joint piston is lowered according to a signal generated by a device that detects that the device for performing welding approaches the spacer, The interference between the spacers is removed; characterized in that it further comprises, and by this method, the center of the pipe and the elbow are matched during welding, the gap of the joint is maintained, and continuous welding can be performed without tack welding.

The clamping device and method for pipe welding of the present invention maintains parallelism at the contact surface between the elbow and the pipe without being tackled when welding the pipe and the elbow, and improves the welding quality by matching the center of the pipe and the elbow. In addition, the spacer used to maintain the gap between the pipe and the elbow during welding is sequentially contracted according to the welding progress, so that continuous welding is possible, thereby improving welding productivity.

Fig. 1. An illustration of the clamping device of the present invention.
Figure 2. Example of operation of the clamping device of the present invention.
Figure 3. Example of the operating state of the spacer.
Fig. 4. An example of a reference line displayed on the top of pipes and elbows.
Figure 5. An example of a reference line marked on the piston head and spacer of the present invention.
Figure 6. Step of adjusting the angle so that the reference line of the clamping device of the present invention inserted into the pipe comes to the top.
Fig. 7. Alignment step of aligning the reference line of the spacer and the elbow after the pipe and the spacer are aligned.
8. A state in which the end of the elbow is in close contact with the spacer.
Fig. 9. An example of a cross section of a head connected to a fixing piston in contact with an inner wall of a piping member.
Figure 10. Illustrative of the three-dimensional shape of the head connected to the fixing piston in contact with the inner wall of the piping member.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art may easily implement the present invention. However, these descriptions are only structural or functional descriptions of the embodiments, and since the embodiments can have various modifications and various forms, the scope of the present invention should not be construed as being limited by these descriptions and embodiments. . In addition, since the object or effect presented in the present invention does not mean that a specific embodiment should include all or only such effects, it should be understood that the scope of the present invention is not limited by this interpretation. That is, the scope of the present invention includes equivalents capable of realizing the technical idea described in the claims.

The clamping device of the present invention is illustrated in FIG. 1. The body 11 includes a pipe fixing piston 12, a joint piston 13, and an elbow fixing piston 15. The joint piston 13 is inserted into a groove (not shown) of the joint cylinder head 18 and is connected to a spacer 14 for maintaining a gap, and each of the piston heads 16, 17, 19 is a piston 12, 15).

2 illustrates a state in which an example of the clamping device of the present invention is inserted into a piping member (eg, a pipe and an elbow). When the piston expanded by the hydraulic line 21 connected to the pipe fixing piston is in close contact with the inside of the pipe, a gap 22 is generated between the lower portion of the piston head and the body. The pressure supply line (eg, hydraulic or pneumatic) 23 connected to the joint piston is separated from the pipe fixing piston hydraulic line 21 and the elbow fixing piston hydraulic line (not shown). The shape of the piston head and the hydraulic line connected to the cylinder in a state in which the fixing piston is extended (24) toward the inner curved part of the elbow by supplying pressure through a hydraulic line (not shown) connected to the elbow fixing cylinder (not shown) The shape of the piston head in a state in which the fixing piston is extended (25) toward the outer curved portion of the elbow by supplying pressure is coincident with the inner curved surface of the elbow, so that the body and the elbow are brought into close contact with each other.

3 illustrates the operation structure of the spacer in the present invention, and a device for generating a signal when a device (eg, a welding head, orbital welding device) for performing welding approaches the spacer connected to the head of the joint piston. It includes, and illustrates a process in which the spacer is sequentially contracted below the junction part by the signal. When the spacer 14 sequentially approaches the limit switch 32 along the rotation direction 33 of the pipe, the control device 34 (eg, hydraulic solenoid) is operated through the signal line 36 to operate the hydraulic line ( The spacer 14 connected to 35) is contracted so that continuous welding proceeds without interference (collision) with the welding device 31 (welding head). Two or more joint pistons are individually connected to separate hydraulic lines for sequential operation.

9 illustrates a cross section of a head connected to a fixing piston in contact with an inner wall of a piping member, and FIG. 10 illustrates a three-dimensional shape of a head connected to a fixing piston in contact with an inner wall of a piping member. The shape of the fixing piston head in the present invention is a curved surface that matches the inner surface of the pipe and the elbow that the head contacts, and two or more of the pistons operate simultaneously so that the head is in close contact with the inner surface of the pipe and the elbow. Match the elbow centerline and angle. As an example, each piston is installed in a cylinder that shares a hydraulic line, and applying or reducing pressure can simultaneously operate the pistons. The piston head connected to the piston is prepared according to the shape of the inner wall of the piping member. In addition, the pipe fixing piston, the joint piston, and the elbow fixing piston can be expanded and contracted, respectively, and can move together as necessary. That is, only the pipe fixing piston operates when the pipe is fixed, only the joint piston operates when the spacer is operated, and when the elbow is fixed, only the elbow fixing piston operates. In addition, during welding, only several joint pistons can be operated for sequential contraction of the spacer, and after welding is completed, the body can be separated from the pipe and the elbow by operating the pipe and the elbow fixing piston at the same time.

5 shows a form in which the spacer is fixed with a pin to the spacer fixing portion formed on the head of the joint piston. The spacers are prepared in various sizes (thickness), and may be replaced with the spacer fixing part by being replaced according to the thickness of the gap required at the joint part of the pipe members. The pin 51 connects the spacer fixing portion 55 of the joint piston head and the spacer. The pipe, the elbow and the body are assembled while maintaining a state in which the reference line 52 of the pipe fixing piston head, the reference line 53 of the spacer, and the reference line 54 of the elbow fixing piston head are aligned with the reference line of the pipe and the elbow.

4 to 8 show a clamping method of matching the center of the pipe and the elbow during welding. 4 illustrates a step of marking a reference line on the upper surface of the pipe and the elbow. Reference lines are marked on the upper surface of the end of the pipe to be welded and the end of the elbow, respectively.

The step of aligning the reference line marked on the piston head and the spacer of the clamping device of the present invention with the reference line of the pipe is illustrated in FIG. 5. 6 shows a step in which a spacer having a thickness equal to the gap to be maintained between the pipe and the elbow and a reference line is installed on the spacer fixing portion of the joint piston head.

7 shows an alignment step of aligning the reference line of the spacer and the elbow after the pipe and the spacer are aligned. That is, the steps of contracting the piston by removing hydraulic pressure from a cylinder that moves the piston of the clamping device; and placing the clamping device in the pipe and aligning the reference line of the clamping device with the reference line of the pipe; and the pipe When one end of the spacer is in close contact with the spacer, the step of supplying hydraulic pressure to the pipe piston to closely contact the fixing piston head; in a state in which the reference line of the pipe and the reference line of the spacer are in contact with each other, the clamping device of the present invention It shows the elbow being inserted into the body of the body.

In FIG. 8, the step of inserting the elbow from the bottom of the body to be inserted into the elbow and aligning and in close contact with the elbow so that the reference line of the upper surface of the elbow coincides with the reference line of the spacer is performed. It shows that the reference lines formed in each coincide. Thereafter, a step in which the piston head is in close contact with the inner surface of the elbow by expanding the fixing piston of the body inserted into the elbow is performed. When this coupling is completed, welding becomes possible.

When welding along the joint while the pipe and the elbow are fixed, the joint piston is lowered according to a signal generated by a device that detects that the device for performing welding approaches the spacer, In the step in which the interference between the spacers is removed, the apparatus for performing the welding may be a welding head. The device for sensing approaching the spacer may be a limit switch.

The meaning of terms used to describe the present invention should be understood as follows. When a component is referred to as being "connected" to another component, it should be understood that although it may be directly connected to the other component, another component may exist in the middle. Singular expressions are to be understood as including plural expressions unless the context clearly indicates otherwise, and terms such as "comprises" or "have" refer to the specified features, numbers, steps, actions, components, parts, or these. It is to be understood that it is intended to designate that a combination exists and does not preclude the presence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. All terms used herein have the same meaning as commonly understood by one of ordinary skill in the field to which the present invention belongs, unless otherwise defined. Terms defined in commonly used dictionaries should be interpreted as having meanings in the context of related technologies, and cannot be interpreted as having an ideal or excessively formal meaning unless explicitly defined in the present invention.

11: body
12: pipe fixing piston
13: Joint piston
14: spacer for maintaining a gap
15: Elbow fixing piston
16: Piston head (example 1 for elbow)
17: piston head (for pipe)
18: joint cylinder head
19: Piston head (example 2 for elbow)
21: Hydraulic line connected to the pipe fixing piston
22: The distance between the lower part of the piston head and the body indicating the state in which the piston expanded by the hydraulic line is in close contact with the pipe.
23: hydraulic line connected to the joint piston
24: Pressure is supplied through a hydraulic line (not shown) connected to the cylinder, and the fixing piston is extended toward the inner curved portion of the elbow.
25: Pressure is supplied through a hydraulic line (not shown) connected to the cylinder, and the fixing piston is extended toward the outer curved portion of the elbow.
31: welding device (welding head)
32: limit switch
33: pipe rotation direction
34: control device (e.g. hydraulic solenoid)
35: hydraulic line
36: signal line
51: pin (connect the spacer fixing part of the joint piston head and the spacer)
52: Piston head reference line for fixing pipes
53: Baseline of the spacer
54: reference line of the elbow fixing piston head
55: spacer fixing part of the joint piston head

Claims (5)

In the clamping device to match the center of the pipe and the elbow for welding,
A body inserted into the pipe and the elbow;
A fixing piston installed along the circumference of the body, fixing the body by contacting the inner surface of the pipe and the elbow, and including a head having a reference line;
A joint piston installed along the circumference of the body below the joint where the pipe and the elbow meet, and including a head having a reference line;
A spacer having a thickness and a reference line equal to a gap to be maintained between the pipe and the elbow at the junction;
A spacer fixing part installed on the head of the joint piston and to which the spacer is coupled; and
A device for generating a signal when the device for performing the welding approaches the spacer connected to the head of the joint piston,
A clamping device in which the spacer is sequentially contracted below the junction part by the signal.
delete The method of claim 1,
The shape of the fixing piston head is a curved surface that matches the inner surface of the pipe or elbow that the head contacts, and two or more pistons operate simultaneously so that the head is in close contact with the inner surface of the pipe or elbow, and the center line of the pipe and the elbow Clamping device, characterized in that to match the angle and. The method of claim 1,
The clamping device, characterized in that the spacer is replaced according to the thickness of the gap required at the junction and is coupled to the spacer fixing portion. In the clamping method to match the center of the pipe and the elbow during welding,
Marking a reference line on the upper surface of the pipe and the elbow;
In the clamping device to match the center of the pipe and the elbow for welding,
A body inserted into the pipe and the elbow;
A fixing piston installed along the circumference of the body, fixing the body by contacting the inner surface of the pipe and the elbow, and including a head having a reference line;
A joint piston installed along the circumference of the body below the joint where the pipe and the elbow meet, and including a head having a reference line;
A spacer having a thickness and a reference line equal to the gap to be maintained between the pipe and the elbow at the junction; and
Aligning the reference line of the clamping device including a spacer fixing part installed on the head of the joint piston and to which the spacer is coupled with the reference line of the pipe;
Installing the spacer having a reference line and a thickness equal to the gap to be maintained between the pipe and the elbow in the spacer fixing portion of the joint piston head;
Retracting the piston by removing pressure from a cylinder that moves the piston of the clamping device;
Placing the clamping device in the pipe and aligning the reference line of the clamping device and the reference line of the pipe to match;
Supplying pressure to the pipe fixing piston when one end of the pipe is in close contact with the spacer to closely contact the fixing piston head;
Inserting the elbow from the bottom of the body to be inserted into the elbow and aligning the elbow so that the reference line of the upper surface of the elbow coincides with the reference line of the spacer;
The piston head is in close contact with the inner surface of the elbow by expanding the fixing piston of the body inserted into the elbow; And
When welding along the joint while the pipe and the elbow are fixed, the joint piston is lowered according to a signal generated by a device that detects that the device for performing the welding approaches the spacer, so that the device and the The clamping method further comprises a; step of removing interference between the spacers.

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