KR101249983B1 - Auto welding machine for setting insulation system inside cargo tank of lng ship - Google Patents

Abstract

The present invention relates to a welding apparatus for installing a sealing wall inside a large structure such as a tank or a pressure vessel of a ship, which can be easily attached to the inside of a large structure, automatically moves along the welding line of the sealing wall and welded. It is an object of the present invention to provide an automatic welding device for installing a sealing wall in a cargo tank of an LNG vessel in which labor cost can be reduced, uniform welding can be performed, and work safety is improved. Automatic welding device according to the present invention for achieving the above object is a welding device for automatically performing the welding operation of the sealing wall inside the large structure, the frame, and is installed on both ends of the frame is attached to the large structure A welding part movably installed on the frame, the welding part moving along the connection part of the sealing wall and welding the connection part of the sealing wall, and positioned at a front end of the welding part to guide the welding position of the sealing wall. It includes a guide.

 Automatic welding, sealing wall, frame, argon, welding torch, distance sensor, jig

Description

AUTO WELDING MACHINE FOR SETTING INSULATION SYSTEM INSIDE CARGO TANK OF LNG SHIP}

1 is a perspective view briefly showing an automatic welding device according to the present invention.

Figure 2 is a plan view showing an automatic welding device according to the present invention.

Figure 3 is a side view showing the guide of the automatic welding device according to the invention.

Figure 4 is a side view showing a welded portion of the automatic welding device according to the present invention.

Figure 5 is a state of installing the fixing jig of the automatic welding device according to the invention.

Figure 6 is a bottom view showing a fixing jig of the automatic welding device according to the present invention.

<Explanation of symbols for main parts of the drawings>

5a, 5b: sealing wall 7: bend

10: automatic welding device 12: frame

13 hollow part 14 fixed part

20: welded portion 21: connection hose

22: body 23: welding torch

24: welding chamber 26: welding part adjusting cylinder

28: distance sensor 28a: receiver

28b: transmitter 30: guide

32: sensing roller 33: stepped portion

34: pressure roller 36: guide portion adjustment cylinder

38: spring 50: fixing jig

52: fixing surface 54: bolt hole

56 bolt 58 support member

The present invention relates to a welding apparatus for installing a sealing wall inside a large structure such as a tank or a pressure vessel of a ship, which is installed inside the large structure to move along the welding line and to automatically weld the connecting portion of the sealing wall. The present invention relates to an automatic welding device for installing a sealed wall in a cargo tank of an LNG vessel.

In general, large structures such as cargo tanks of LNG vessels are provided with a sealing wall to insulate the interior for transport or storage of cryogenic LNG. The sealing wall is the LNG stored therein is leaked to the outside to reduce the durability when in contact with the hull, thereby lowering the safety of the vessel is the sealing of the inside is one of the important problem.

To this end, the conventional LNG vessels install a scaffolding device disposed in close proximity to the inner wall for installation of the sealing wall therein, and the operator installs the sealing wall therein using the scaffolding device.

However, in order to seal the inside of the sealing wall, the worker has to carry the welding machine directly and move the scaffolding device to perform the welding work. In addition, there is a problem that a difference in welding quality occurs depending on the skill of the operator or the condition of the operator. Therefore, such internal welding work is made mainly by the skilled person, the production cost is increased. In addition, since the internal welding work is performed from the low floor to the high floor, since the operator must pay attention to safety at the same time as the welding work, nerves are easily dispersed, and there is a lot of risk of safety accident.

An object of the present invention is to solve the above-described problems of the prior art, can be easily attached to the inside of a large structure, to automatically move along the welding line of the sealing wall to perform the welding operation, to reduce labor costs The present invention provides an automatic welding device for installing a sealed wall in a cargo tank of an LNG ship, which enables uniform welding work and improves safety of work.

Automatic welding device according to the present invention for achieving the above object is a welding device for automatically performing the welding operation of the sealing wall inside the large structure, the frame, and is installed on both ends of the frame is attached to the large structure A welding part movably mounted on the frame, the welding part moving along the connecting part of the sealing wall and welding the connecting part of the sealing wall, and a welding position of the sealing wall located at the front end of the moving part of the welding part. Includes a guide to guide you. **

Here, the fixing part may be made of an electromagnet. In addition, one end of the sealing wall overlaps with another adjacent sealing wall, and the guide part may include a sensing roller, and the roller may move along the lower end of the overlapping sealing wall and guide the welding part. In addition, the guide portion may include a pressing roller which is located at the rear of the sensing roller and pressurized to move in close contact with the overlapping sealing wall. The welding part may include a body part to which a gas supply part is connected, a welding torch installed in the body part to enable adjustment of a distance spaced from the sealing wall, and to which gas supplied from the gas supply part is supplied, and a rear part of the welding torch. Located in, it may include a welding chamber for maintaining the welding portion in an argon atmosphere. In addition, the guide portion may be connected to the welding portion by a spring. The welding unit may include a distance sensor for detecting a distance separated from the welding torch and the body part, and a controller for adjusting the length of the welding torch according to the distance information input from the distance sensor. Meanwhile, the fixing jig may be fixed to a wall surface or a sealing wall of the large structure, and may include a fixing jig providing a plane to which the fixing part may be attached. The fixing jig may have a shape corresponding to the wall surface or the sealing wall. It may include a support member.

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

1 is a perspective view briefly showing an automatic welding device according to the present invention, Figure 2 is a plan view showing an automatic welding device according to the present invention.

Automatic welding device 10 according to the present invention, as shown in Figure 1 and 2, is a device for automatically performing the welding operation of the sealing wall inside the large structure.

The automatic welding device 10 includes a frame 12 having a hollow portion 13 formed along the sealing wall, and both ends of the frame 12 are provided with fixing parts 14 for attaching to a large structure. .

The fixing part 14 is made of an electromagnet, and when power is supplied to the electromagnet, an attraction force is generated and fixed to an inner wall or another sealing wall of the large structure. Accordingly, the automatic welding device 10 can be attached and detached according to the power supplied to the fixing part 14, and can be easily fixed to a desired working part.

On the other hand, the frame 12 is provided with a welding portion 20 for moving along the connecting portion of the sealing wall and welding the connecting portion of the sealing wall. In addition, the front end of the welding portion 20 is provided with a guide portion 30 for guiding the welding position of the sealing wall.

Here, the frame 12 is provided with a sliding means for supporting the welding portion 20 and the guide portion 30 to move freely, the sliding means is made of a linear guide or the like and the welding portion 20 and the guide The unit 30 is coupled to allow horizontal movement.

The automatic welding device 10 configured as described above detects the welding line of the sealing wall overlapped by the guide unit 30 and the welding unit 20 performs the welding operation along the detected welding line.

Figure 3 is a side view showing the guide of the automatic welding apparatus according to the present invention.

More specifically, as shown in FIG. 3, the guide part 30 includes a sensing roller 32 that moves along the lower ends of the overlapping sealing walls 5a and 5b and detects a welding line. The sensing roller 32 is disposed to be inclined, and a stepped portion 33 is formed at a lower end thereof. The sensing roller 32 is moved in a state where the outer circumferential surface is in contact with the upper edge of the sealing wall, and the stepped portion 33 is moved in a state in which it is in contact with the bottom surface of the sealing wall to accurately detect the weld line of the sealing wall. Can be.

In addition, the guide part 30 is provided with a pressure roller 34 for moving while pressing the overlapping sealing walls (5a, 5b) to the rear of the sensing roller (32). The pressing roller 34 presses the side surfaces of the ends of the sealing wall 5a to bring the overlapping sealing walls 5a and 5b into close contact with each other.

The guide part 30 is installed at one end of the guide part adjustment cylinder 36 which can be adjusted in length, and the end part of the guide part adjustment cylinder 36 is an elastic member, for example, the spring 38 by the welding part 20. ). Accordingly, the guide part 30 may be in close contact with the surface of the sealing wall by the spring 38 in a state where the length is adjusted by the guide part adjusting cylinder 36. In addition, the guide portion 30 is to have a predetermined within the tolerance range by the spring 38, thereby preventing the welding portion 20 from intermittently moving according to the difference in the thickness of the sealing wall. have.

On the other hand, Figure 4 is a side view showing a welding portion of the automatic welding device according to the present invention, the welding portion 20 is the body portion 22 and the body portion 22 connected through the gas supply portion and the connection hose 21. A welding torch 23 for arc or gas welding is connected with the welding torch, and the welding torch 23 burns and welds the gas supplied from the gas supply unit. In this case, the gas supplied from the gas supply unit is preferably an argon (Ar) gas, which is a kind of inert gas.

In addition, a welding chamber 24 is formed at a rear portion of the welding torch 23 to maintain the welded portion of the sealing wall in an argon atmosphere for a predetermined time.

The welding chamber 24 is formed of a chamber having a predetermined volume of space behind the welding torch 23, and the argon gas supplied from the gas supply part stays in the space of the chamber for a predetermined time and is welded to the sealing wall. Stabilize the connections. In addition, the welding chamber 24 is formed to have a predetermined length so that the welding operation of the sealing wall can be made continuously, the length of the welding chamber 24 is the movement speed and welding conditions of the welding portion 20, etc. Can be determined accordingly.

In addition, the welding torch 23 is connected to the welding portion adjusting cylinder 26 installed to be adjustable in the body portion 22, the welding torch 23 in accordance with the expansion or contraction of the welding portion adjusting cylinder 26. Is controlled to maintain a predetermined distance from the sealing walls 5a and 5b.

In addition, the welding part 20 includes a distance sensor 28 for detecting a distance separated from the welding torch 23 and the body portion 22, the distance sensor 28 to the welding part adjusting cylinder ( 26) is connected to the control unit to adjust the length of the welding torch (23). Here, the distance sensor 28 is composed of a receiver 28a and a transmitter 28b.

More preferably, the controller is connected to the spring 38 of the guide unit 30, the control unit according to the clearance signal input from the spring 38 and the distance information measured from the distance sensor 28 The distance between the welding torch 23 and the sealing wall can be adjusted.

On the other hand, the conventional sealing walls (5a, 5b) can be contracted by the stored cryogenic liquid, a number of bent portions (7) are formed on the surface so as not to be damaged by this contraction phenomenon. As such, when the sealing walls 5a and 5b are formed to be bent, the fixing portion 14 of the automatic welding device 10 may not be firmly attached.

In order to solve this problem, the present invention may further include a fixing jig 50 for fixing the fixing part 14 to the sealing walls 5a and 5b.

Figure 5 is a state diagram for installing the fixing jig of the automatic welding apparatus according to the present invention, Figure 6 is a bottom view showing the fixing jig of the automatic welding apparatus according to the present invention.

The fixing jig 50, as shown in Figures 5 and 6, includes a fixing surface 52 made of a plane, the fixing portion 14 of the automatic welding device 10 on the fixing surface 52 ) Can be easily attached. In addition, a bolt hole 54 is formed in the fixing surface 52, and the bolt 56 is fastened to the sealing wall by fastening the bolt 56.

Here, the bolt 56 is preferably formed with a hexagonal groove in the head, the bolt hole 54 may be formed to have a predetermined step so that the bolt head does not protrude when the bolt 56 is fastened.

In addition, a support member 58 having a shape corresponding to the bent portion 7 of the sealing wall may be installed below the fixing jig 50. The support member 58 is located between the concave portions of the bent portion 7 to stably support the fixing jig 50. Here, the support member 58 may be provided in plural, for example, in the embodiment of the present invention, the support member 58 is installed at four places consisting of pipe members corresponding to the bent portion 7 and is fixed to the support member 58. The jig 50 is stably supported.

Looking at the operation of the automatic welding device configured as described above are as follows.

First, a scaffolding device for work is installed inside the large structure. The scaffolding device provides a workspace for facilitating the installation of the sealing walls 5a and 5b on the inner wall of the large structure, and is used for storing and moving workers or materials.

As such, when the installation of the scaffolding device is completed, the worker attaches the automatic welding device 10 to the sealing walls 5a and 5b. At this time, when the automatic welding device 10 is supplied with power, the fixing portion 14 made of an electromagnet installed at both ends of the frame 12 is charged, and is attached by a force of magnetic force.

More preferably, the fixing jig 50 is coupled to the sealing walls 5 and 5b for attachment of the automatic welding device 10. To this end, the fixing jig 50 is supported by the support member 58 installed in the lower portion of the sealing wall (5, 5b) is bent in the space between the restrained movement. Next, the bolt 56 is inserted into the upper surface of the fixing jig 50 to be fastened to the sealing walls 5 and 5b.

When the fixing jig 50 is fixed, the fixing part 14 of the automatic welding device 10 is positioned on the plane of the fixing jig 50, and power is supplied to fix the fixing part 14. It is attached to the plane of the stopper 50.

In this way, the installed automatic welding device 10 is the guide portion 30 and the welding portion 20 in the state in which the sensing roller 32 of the guide portion 30 senses the lower end of the overlapping sealing walls (5a, 5b) Moves. At the same time, the pressure roller 34 located at the rear of the sensing roller 32 presses the overlapping upper and lower sealing walls 5a and 5b to be in close contact with each other.

Next, when the guide unit 30 and the welding unit 20 proceeds, the gas required for the welding operation of the welding unit 20 is supplied from the gas supply unit to the welding torch 23 and a flame is generated. At this time, the flame of the welding torch 23 melts a part of the overlapping sealing walls 5a and 5b and welds the overlapping sealing walls 5a and 5b without any gaps. Meanwhile, argon (Ar) gas is supplied to the welding chamber 24 located at the rear of the welding torch 23 and maintains the welding portion 20 in an inert atmosphere.

As such, when the welding operation of the sealing walls 5 and 5b is completed, the automatic welding device 10 of the present invention cuts off the power supplied to the fixing portion 14 to separate the automatic welding device 10. . Then, the fixing jig 50 is removed by removing the bolt 56 that fastens the fixing jig 50.

As described above, the automatic welding device for installing the sealing wall in the cargo tank of the LNG vessel according to the present invention was described with reference to the illustrated drawings, but the present invention is not limited by the embodiments and drawings described above, and claims Various modifications and variations can be made by those skilled in the art to which the present invention pertains. In addition, the automatic welding device according to the present invention can be used not only for the installation of the sealing wall of the cargo tank of LNG vessels, but also in the construction of large structures such as pressure vessels, tanks or domes installed for land use.

Automatic welding device for installing the sealing wall in the cargo tank of the LNG vessel according to the present invention configured as described above can be performed automatically along the welding line of the sealing wall, it is possible to reduce labor costs due to welding work, skilled workers If it is not, welding can be performed with the same quality and safety of work is improved. In addition, the automatic welding device can be easily removable in the interior of a large structure has the advantage of good workability, easy to move.

Claims (9)

Welding apparatus for automatically performing the welding work of the sealing wall inside the large structure, A frame; Fixed parts installed at both ends of the frame and attached to a large structure; A welding part movably installed in the frame, the welding part moving along a connection part of the sealing wall and welding a connection part of the sealing wall; A guide part positioned at a front end of the welding line to guide the welding position of the sealing wall; / RTI &gt; The sealing wall has one end overlapped with another adjacent sealing wall, and the guide part includes a sensing roller, and the roller moves along the lower end of the overlapping sealing wall and guides the welding part. Welding equipment. The method according to claim 1, Automatic fixing device, characterized in that the fixing portion made of an electromagnet. delete The method according to claim 1, The guide part is an automatic welding device, characterized in that it comprises a pressing roller which is located in the rear of the sensing roller and pressurized to move in close contact with the overlapping sealing wall. The method according to claim 1, The welding portion and the body portion connected to the gas supply portion, A welding torch installed in the body to enable adjustment of a distance spaced from the sealing wall and supplying gas supplied from the gas supply unit; Located in the rear of the welding torch, the automatic welding device comprising a welding chamber for maintaining the welding portion in an argon atmosphere. The method according to claim 4 or 5, The guide part is an automatic welding device, characterized in that connected to the elastic member including the welding portion and the spring. The method of claim 5, The welding part and a distance sensor for detecting the distance between the welding torch and the body portion; And a control unit for adjusting the length of the welding torch according to the distance information input from the distance sensor. The method according to claim 1, And a fixing jig fixed to the wall surface or the sealing wall of the large structure, the fixing jig providing a plane to which the fixing part is attachable. The method of claim 8, The fixing jig is installed in the lower portion of the automatic welding device, characterized in that it comprises a support member having a shape corresponding to the wall surface or the sealing wall.

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