KR100796632B1 - Auto welding machine for setting sealing wall on cargo tank of lng ship - Google Patents

Abstract

An apparatus for automatically welding sealing walls to a cargo tank of an LNG ship is provided to reduce labor cost, enable a uniform welding operation to be performed, and improve safety of the welding operation by allowing the apparatus to be easily attached to an inner part of an LNG tank and automatically moving the apparatus along a welding line of the sealing walls to perform a welding operation. An apparatus(20) for automatically welding sealing walls(10a,10b) to a cargo tank of an LNG ship comprises: a frame(30) installed across weldments; a fixing part installed at both ends of the frame and attached to an inner part of the tank of the LNG ship; a welding part(40) movably installed on the frame and moved along joints of the sealing walls to weld the joints of the sealing walls; and a guiding part for guiding a welding position of the welding part, the guiding part including a sensing roller installed at the front on a moving line of the welding part to sense the joints of the sealing walls. The welding part and the guiding part include a joining part(35) movably installed on the frame, and a lifting part(70) installed on the joining part. The joining part includes a rack part(31), a connecting block(36), a rotary gear part(39). The lifting part includes a motor, an extension shaft, a moving body, and a case(75). The welding part includes a body part(42), a gas supply part(43), a welding torch(45), a welding chamber(46), a guide(48), and a rotary roller(49).

Description

AUTO WELDING MACHINE FOR SETTING SEALING WALL ON CARGO TANK OF LNG SHIP}

1 is a block diagram of an automatic welding device for installing a sealing wall of a tank of an LS ship according to the present invention.

Figure 2 is a schematic diagram showing an automatic welding device for installing the sealing wall of the tank of the LS ship according to the present invention.

Figure 3 is a perspective view of the automatic welding device for installing the sealing wall of the tank of the LS ship according to the present invention.

Figure 4 is a plan view of the automatic welding device for installing the sealing wall of the tank of the LS ship according to the present invention.

Figure 5 is a perspective view showing a part of the automatic welding device for installing the sealing wall of the tank of the LS ship according to the present invention.

6 is a measurement side view of an automatic welding device for installing a sealing wall of a tank of a LAN ship according to the present invention.

7 is a measurement side view of an automatic welding device for installing a sealing wall of a tank of a LAN ship according to the present invention.

8 is a cross-sectional view of an automatic welding device for installing a sealing wall of a tank of an LS ship according to the present invention.

Figure 9 is a state diagram for installing the fixing jig of the automatic welding device for installing the sealing wall of the tank of the LS ship according to the present invention.

10 is a perspective view showing a lower portion of a fixing jig of an automatic welding device for installing a sealing wall of a tank of a LAN ship according to the present invention.

11 is a block diagram showing the installation process of the sealing wall using the tank sealing wall preliminary assembly method of the LAN ship according to the present invention.

12 is a block diagram of a preliminary welding apparatus for a tank sealing wall of a LAN vessel according to the present invention.

It is a perspective view of the preliminary welding apparatus of the tank sealing wall of a LAN ship which concerns on this invention.

14 is a perspective view and a side cross-sectional view of a preliminary welding apparatus for a tank sealing wall of an LS ship according to the present invention.

<Explanation of symbols for the main parts of the drawings>

1: LNG tank 10a, 10b: sealing wall

15: bend 20: automatic welding device

30 frame 31: recreation part

32: rail 35: coupling portion

35a: motor seat 36: connection block

37: roller 38: moving motor

39: rotating gear part 40: welding part

42: body portion 43: gas supply portion

45: welding torch 46: welding chamber

48: guide guide 49: rotary roller

50: guide 52: sensing roller

54: push roller 56: bracket

60: fixed part 70: lifting part

72: lifting motor 73: rotating shaft

74a: operating knob 74b: locking portion

75 case 76 pressure sensing unit

78: hollow portion 79: through hole

80: fixed jig 82: fixed surface

83: fastening hole 83a: seating portion

84: fastening member 85: support member

The present invention is a welding apparatus for installing a sealing wall inside an LNG tank, such as a tank or a pressure vessel of a ship, which is installed inside the LNG tank and moves along a welding line and automatically welds the connecting portion of the sealing wall. It relates to a tank sealing wall automatic welding device.

In general, liquefied natural gas (Liquefied Natural Gas, LNG) is a liquefied natural gas, one of the fossil fuels, liquefied natural gas storage tank is a land-type storage tank that is installed on the ground or buried in the ground depending on the installation location or It is classified into a mobile storage tank installed in a vehicle or a vehicle.

The above-described liquefied natural gas has a risk of explosion when exposed to an impact, and is stored in a cryogenic state. The storage tank storing the liquefied natural gas has a structure in which impact resistance and liquid tightness are firmly maintained. Such storage tanks are somewhat different in that the structures of liquefied natural gas storage tanks installed in automobiles and ships with flows must be prepared against the mechanical stress caused by the flow, compared to land storage tanks with little flow. There is. However, since the liquefied natural gas storage tank installed in the vessel provided with a countermeasure against mechanical stress can be used in the land-type storage tank, of course, the present invention describes the structure of the liquefied natural gas storage tank installed in the vessel as an example.

First, liquefied natural gas (Liquefied Natural Gas, LNG) storage tanks installed in the LNG carrier can be divided into independent tank (Membrane Type). This is a classification according to whether the load of the cargo directly acts on the insulation, the details are as follows.

In Table 1, aka GTT NO 96-2 type and GTT Mark III type were renamed Gaz Transport (GT) and Technigaz (TGZ) in 1995 as GTT (Gaztransport & Technigaz), respectively, GT type was GTT NO 96 -2 type, TGZ type is renamed GTT Mark III type.

The GT and TGZ tank structures described above are described in US Pat. Nos. 6,035,795, US6,378,722, US5,586,513, US Pat. Recent techniques related to corners (edges) in LNG storage tanks include "liquid and thermal insulation tanks with improved edge structures as tanks installed in support structures of ships" disclosed in Korean Patent Laid-Open Publication No. KR2000-0011347. have. As such, the thermal insulation system and its installation method installed inside the LNG tank such as a ship can be described with reference to the above-mentioned known invention. In addition, by the present applicant, a method of simplifying the structure of the tank for storing liquefied natural gas, which is a liquid of ultra low temperature, and shortening the assembly process, and at the same time, maintaining a liquid tightness is a method of domestic patent application No. 10-2006-35743 It is filed in the form of a liquefied natural gas storage tank having an improved insulation structure and a method of manufacturing the same.

As such, LNG tanks, such as cargo tanks of LNG vessels, are provided with a thermal insulation system for insulating the interior for transporting or storing low temperature LNG and a sealing wall for preventing the leakage of LNG. This sealing wall has the LNG stored inside to be leaked to the outside to reduce the durability when it comes in contact with the hull, thereby reducing the safety of the vessel as well as the risk of explosion, the sealing of LNG is one of the important tasks in the safety of the vessel. . For the installation of the sealing wall described above, the conventional LNG vessel installs the scaffolding device which is arranged in close proximity to the inner wall for the 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. In addition, conventionally, the welding work is performed separately in the state where the material is installed on the inner wall of the LNG tank, so that the work speed is low and the work quality is also poor. In addition, the conventional sealing wall is provided with a sealing wall by directly welding the sealing member cut to its shape to the LNG tank, thereby increasing the amount of work of the sealing wall, and is also a factor that reduces the efficiency of the work.

Furthermore, the sealing wall of the LNG tank is made of Invar steel whose material is stainless alloy or nickel alloy, which is difficult to weld.

An object of the present invention is to solve the above-mentioned problems of the prior art, can be easily attached to the inside of the LNG tank, to automatically move along the welding line of the sealing wall to perform the welding operation, it is possible to reduce labor costs The present invention provides a tank sealing wall automatic welding device for a LAN ship, in which a uniform welding operation is possible and safety of work is improved.

Tank sealing wall automatic welding device of the LAN ship according to the present invention for achieving the above object and the frame is installed across the welding target portion, the fixed portion is installed on both ends of the frame and attached to the tank of the LNG vessel A welding part movable 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 positioned at a front end of the moving line of the welding part, and connecting the connecting part of the sealing wall. A sensing roller is provided to detect the guide part to guide the welding position of the welding part, and automatically performs a welding operation for installing a sealing wall inside the tank of the LNG vessel.

The welding part and the guide part may further include a coupling part installed to be movable with the frame, and a lifting part installed at the coupling part to adjust the height of the welding part and the guide part. Here, the coupling portion includes a rack portion installed in the longitudinal direction along the frame, a connecting block movably coupled along the frame, and a rotary gear portion driven by a motor installed in the connecting block and engaged with the rack portion. can do. In addition, the lifting unit is a motor provided in the engaging portion, an extension shaft connected to the rotation shaft of the motor and the screw portion is formed on the outer peripheral portion, a screw portion corresponding to the extension shaft is formed on the inner peripheral surface and inserted into the extension shaft, It may include a case embedded to suppress the rotation of the movable body and fixed to the welding portion and the guide portion. In addition, when the motor rotates, the movable body inserted into the extension shaft is lifted, and the welding part and the guide part fixed to the case may be lifted. Here, the case is provided with a through hole penetrating a predetermined hollow portion and the center of the hollow portion therein, the movable body is an operation knob inserted into the through hole, and one end of the operation knob in a direction perpendicular to the axis It may be extended to include a locking portion that is elevated in the hollow portion. In addition, the lifting unit may further include a pressure sensing unit for sensing the pressure in which the guide portion is in close contact with the sealing wall in order to adjust the distance between the welding portion or the guide portion and the sealing wall. The pressure sensing unit may include a pressure sensor installed inside the case to measure a pressure contacting a lower end of the locking unit when the movable body descends. Preferably, the fixing unit may include an electromagnet. In addition, one end of the sealing wall overlaps with another adjacent sealing wall, and the sensing roller may move along the lower end of the overlapping sealing wall and guide the welding part. In addition, the sensing roller may be an inclined roller which is clouded along the lower end of the overlapped sealing wall and detects a welding position of the sealing wall. In addition, the sensing roller may further include a pressing roller for pressing the upper surface of the overlapped sealing wall to be in close contact with the lower sealing wall. The welding part may include a body part to which a gas supply part is connected and the distance of the sealing wall is adjustable, and a welding torch installed in the body part to ignite the gas supplied from the gas supply part. In addition, it may include a welding chamber located at the rear of the welding torch to maintain the welding position of the sealing wall in an inert gas atmosphere. Here, the inert gas may be an argon gas. In addition, the welding part may further include a height adjusting part for maintaining a distance spaced from the sealing wall. The height adjusting part may include a rotating roller which is formed in a size corresponding to a distance that the welding part is spaced apart from the sealing wall and moves along an upper surface of the sealing wall. And, it may include a fixing jig fixed to the wall surface or the sealing wall of the LNG tank, providing a plane to which the fixing portion is attachable. The fixing jig may include a support member installed below and having a shape corresponding to the wall surface or the sealing wall.

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

1 is a block diagram of an automatic welding device for installing the sealing wall of the tank of the LUNK ship according to the present invention, Figure 2 is a simplified illustration of the automatic welding device for installing a sealing wall of the tank of the LNK ship according to the present invention It is a block diagram.

The automatic welding device 20 for installing the sealing wall of the tank of an LS ship according to the present invention, as shown in Figs. 1 and 2, the sealing wall (10a) inside the LNG tank 1, which is one of the LNG tanks , 10b) automatically perform the welding work to install.

To this end, the automatic welding device 20 is installed across the frame 30 to the welding target portion of the sealing walls (10a, 10b), the welding portion 40 and the guide portion 50 is installed on the frame 30 Coupling portion 35 is movably coupled.

The automatic welding device 20 is attached to the surfaces of the sealing walls 10a and 10b by fixing parts 60 provided at both ends of the frame 30, and the coupling part 35 is connected to the frame 30. It moves along the () and welds the connecting portions of the sealing walls (10a, 10b), it is installed on the inner wall of the LNG tank (1).

More specifically, with reference to Figs. 3 and 4, which are a perspective view and a plan view of a tank sealing wall automatic welding device of a LAN ship according to the present invention will be described as follows.

It is installed along the frame 30 in the longitudinal direction and includes a rec portion 31 formed with a leak screw on the upper surface, the coupling portion 35 is movable connecting block 36 along the frame 30 To be combined. To this end, rails 32 are formed on both sides of the frame 30, and the connection block 36 is provided with rollers 37 coupled to the rails 32. In addition, the coupling unit 35 is provided with a moving motor 38, the rotary gear unit is engaged with the rack portion 31 as the drive of the mobile motor 38 to move the connection block 36. 39 is installed.

In addition, the frame 30 is provided with fixing parts 60 at both ends in order to attach to the LNG tank (1). At this time, the LNG tank 1 or the sealing wall (10a, 10b) is made of a steel structure, the fixing part 60 is the inner wall of the LNG tank (1) or other sealing wall (10a, 10b) by the magnetic force It can be configured to include an electromagnet to be attached to. Therefore, the operator can be attached to the LNG tank 1 or the sealing walls (10a, 10b) by supplying power to the electromagnet, or can cut off the power supply to easily separate the automatic welding device 20, thereby The automatic welding device 20 can be easily attached and detached to a desired working part.

Figure 5 is a perspective view showing a part of the tank sealing wall automatic welding device of the LS ship according to the present invention separated, Figure 6 and Figure 7 is a guide portion, welding portion of the tank sealing wall automatic welding device of the LS ship according to the present invention Fig. 8 is a cross-sectional view of the elevation of the tank sealing wall automatic welding device of the LAN ship according to the present invention.

On the other hand, the welding portion 40 is moved along the connection portion of the sealing wall (10a, 10b) attached to the LNG tank 1 as the coupling portion 35 moves along the frame (30) Weld the joints of the walls 10a, 10b. And, the front end of the welding portion 40 is provided with a guide portion 50 for guiding the movement of the welding portion 40 by detecting the welding position of the sealing walls (10a, 10b).

At this time, the sealing wall 10a in which the welding operation is performed is installed so that one end overlaps with another sealing wall 10b, and the guide part 50 is preceded and overlapped at the front end of the welding part 40. The welding line of the sealing walls 10a and 10b is sensed, and the following welding part 40 performs welding along the detected welding line.

To this end, the guide unit 50 includes a sensing roller 52 for detecting the weld line of the sealing walls (10a, 10b). The sensing roller 52 moves along the lower ends of the sealing walls 10a and 10b overlapping upwards and guides the movement of the welding part 40. Here, as the sensing roller 52 moves along the lower ends of the sealing walls 10a and 10b, the welding positions of the sealing walls 10a and 10b are detected.

In addition, the sensing roller 52 further includes a pressing roller 54 which presses an upper surface of the overlapped sealing wall 10 to be in close contact with the sealing wall 10b at the bottom thereof. As such, as the pressing roller 54 presses the upper portions of the sealing walls 10a and 10b, a gap does not occur between the lower sealing walls 10a and 10b and accordingly, the pressing roller ( 54 can move more accurately along the lower ends of the sealing walls 10a, 10b.

In addition, the push roller 54 is inclined to the connection block 36 by a bracket 56, and the upper surface of the sealing wall (10b) and the lower surface and the lower surface of the sealing wall (10a) overlapping the upper The welding line of the sealing walls 10a and 10b may be accurately detected while moving in contact with the contact state.

On the other hand, the coupling portion 35 may include a lifting portion 70 for adjusting the height of the welding portion 40 and the guide portion 50. The elevating part 70 may adjust the height of the welding part 40 and the guide part 50, so that the guide part 50 is in close contact with the surfaces of the sealing walls 10a and 10b. It is possible to move, and the spark injected from the welding portion 40 can be spaced apart from the sealing walls (10a, 10b) to an appropriate position to maintain a constant welding quality.

The lifting unit 70 is provided with a lifting motor 72 to the motor seating portion (35a) connected to the coupling portion 35, the screw portion is formed on the outer peripheral portion of the rotation shaft 73 of the lifting motor (72). In addition, the lifting unit 70 includes a movable body 74 inserted into the rotating shaft 73, the threaded portion corresponding to the threaded portion of the rotating shaft 73 is formed on the inner peripheral surface of the movable body 74. In addition, the movable body 74 is installed inside the case 75 fixed to the welding part 40 and the guide part 50. At this time, the movable body 74 is suppressed from rotating by the case 75. Accordingly, the movable body 74 may be moved up and down inside the case 75 as the extension shaft rotates when the motor 38 rotates.

Here, the case 75 has a predetermined hollow portion 78 is formed so that the movable body 74 can be installed therein, and a through hole 79 penetrating the center of the hollow portion 78 is formed.

On the other hand, the movable body 74 includes an operating knob 74a inserted into the rotation shaft 73 and a locking portion 74b extending in a direction orthogonal to the shaft at one end of the operating knob 74a. The operating knob 74a of the movable body 74 is inserted into the through hole 79 of the case 75 while the rotating shaft 73 is inserted. In addition, the locking portion 74b is located in the hollow portion 78 and comes into contact with the inner surface of the case 75 to limit the movement in the rotation direction. Therefore, when the rotating shaft 73 rotates when the motor 38 rotates, the movable body 74 moves up and down along the rotating shaft 73.

In addition, the lifting unit 70 is the pressure that the guide unit 50 is in close contact with the sealing wall (10a, 10b) in order to adjust the distance the welding portion 40 is spaced apart from the sealing wall (10a, 10b). It further comprises a pressure sensing unit 76 for detecting.

The pressure sensing unit 76 includes a pressure sensor installed inside the case 75, the pressure sensor is in contact with the lower end of the locking portion when the lowering of the movable body 74 and the lowering of the movable body 74 Measure the pressure. The distance of the welded part 40 or the guide part 50 from the sealing walls 10a and 10b can be known through the pressure of the movable body 74 measured as described above.

Meanwhile, the welding part 40 includes a body part 42 to which a gas supply part 43 is connected, and the welding part 45 ignites the gas supplied from the gas supply part 43 to the body part 42. Prepared. At this time, the body portion 42 is installed to enable the adjustment of the distance away from the sealing walls (10a, 10b). To this end, the body portion 42 may be coupled to move up, down by the guide guide 48 installed on the coupling portion 35.

In addition, the welding portion 40 is a welding position of the sealing wall (10a, 10b) in the inert gas atmosphere in order to prevent the welding position of the sealing wall (10a, 10b) in the rear portion of the welding torch 45. The welding chamber 46 is maintained to be located. The welding chamber 46 is formed of a chamber having a predetermined volume of space behind the welding torch 45, and is supplied with an inert gas, preferably argon gas, supplied from the gas supply unit 43, for a predetermined time. While remaining in the space of the welding chamber 46 to stabilize the connection of the welded sealing wall (10a, 10b). In addition, the welding chamber 46 is formed to have a predetermined length so that welding operations of the sealing walls 10a and 10b can be continuously performed, and the length of the welding chamber 46 is the movement of the welding part 40. Speed and welding conditions, and the like.

In addition, the welding portion 40 is further provided with a height adjusting unit for maintaining a distance from the sealing walls (10a, 10b). The height adjusting part includes a rotary roller 49 having a size corresponding to the distance that the welding part 40 is spaced apart from the sealing walls 10a and 10b. The welding part 40 moves the rotary roller 49 apart by a distance spaced apart from the surfaces of the sealing walls (10a, 10b). As such, the welding part 40 is ignited by the welding torch 45 because the welding torch 45 maintains a constant distance from the surfaces of the sealing walls 10a and 10b by the rotating roller 49. The spark is maintained at a constant distance from the welding position of the sealing walls (10a, 10b).

On the other hand, the normal sealing wall (10a, 10b) can be contracted by the stored cryogenic liquid, a plurality of bent portion 15 is formed on the surface so as not to be damaged by this contraction phenomenon. As such, when the sealing walls 10a and 10b are formed to be bent, the fixing part 60 of the automatic welding device 20 may not be firmly attached.

In order to solve this problem, the present invention may further include a fixing jig 80 for fixing the fixing part 60 to the sealing walls 10a and 10b.

9 is a state diagram in which the fixing jig of the tank sealing wall automatic welding device of the LAN ship according to the present invention is installed, and FIG. 10 is a perspective view showing the lower part of the fixing jig of the tank sealing wall automatic welding device of the LEN ship according to the present invention. to be.

The fixing jig 80, as shown in Figure 9 and 10, includes a fixing surface 82 made of a plane, the fixing portion 60 of the automatic welding device 20 on the fixing surface 82 ) Can be easily attached. In addition, a fastening hole 83 is formed in the fixing surface 82, and a fastening member 84 is fastened to the fastening hole 83 to be fixed to the sealing walls 10a and 10b.

To this end, a screw hole is formed in an inner surface of the tank, and the fastening member 84 may be formed of a bolt or nut having a spiral portion formed on an outer circumferential surface thereof so as to be fastened to the screw hole. Preferably, the screw hole of the tank is formed through the sealing wall welded to the surface, the sealing wall (10a, 10b) is formed with a plurality of bent portion 15 around the screw hole.

Here, the fastening member 84 is preferably formed with a hexagonal groove in the head, the fastening hole 83 is a predetermined seating portion (83a) so that the upper end does not protrude when the fastening member 56 is fastened. It can be formed to have.

On the other hand, the fixing surface 82 is made of a material such as steel so that the fixing portion 60 including the electromagnet, the fixing jig 80 to the inner wall of the tank as a fastening member 84 After fixing, the fixing part 60 may be attached.

Therefore, the sealing walls 10a and 10b are not only made of a material such as steel so that the fixing part 60 can be attached by magnetic force, but also made of a nonmagnetic material such as stainless steel or Inba steel or aluminum. The fixing part 60 of the automatic welding device 20 can be easily attached to the fixing surface 82 of the fixing jig 60.

In addition, a support member 85 having a shape corresponding to the bent portion 15 of the sealing walls 10a and 10b may be installed below the fixing jig 80. The support member 85 is positioned between the concave and convex portions of the bent portion 15 to stably support the fixing jig 80. Here, the support member 85 may be provided in plurality, and in the embodiment of the present invention, the support member 85 may be formed in a shape corresponding to the bent portion 15. For example, the support member 85 may be formed of a rod member, and more preferably, may be formed of a hollow pipe member. In addition, the support member 85 is arranged in two rows, each row is arranged in a shape that is formed intermittently at a predetermined interval, so that the overall shape has a form that is constantly arranged in four places, the fixing jig 80 will be stably supported.

On the other hand, look at the tank sealing wall welding method of the LAN vessel using the above-described fixing jig as follows.

First, the fixing jig 80 described above in the first step is moved to a place where the automatic welding device 20 is to be installed in order to weld the sealing wall into the tank of the LAN ship. In the next step, the fixing jig 80 is fixed inside the tank. In this case, the fixing jig 80 inserts the fastening member 84 into the fastening hole 83 formed in the fastening surface 82, and the fastening member is coupled to the screw hole formed in the inner surface of the tank to fix the fastening jig ( 80).

Then, in the next step, the electromagnetization by supplying power to the fixing portion 60 of the automatic welding device 20, and attaching the fixing portion 60 to the fixing surface 82 of the fixing jig 80. . As such, when the automatic welding device 20 is attached to the fixing jig 80, the automatic welding device 20 is operated in the next step to automatically weld the sealing walls 10a and 10b.

The tank sealing wall welding method of the LNK vessel which is formed as described above is made of a material such as steel so that the fixing surface 82 can be fixed by the magnetic force of the fixing part 60, and the sealing wall is made of steel or the like. In addition to the material, that is, the magnetic material, the automatic welding device 20 may be fixed by using the fixing jig 80 even when it is made of a nonmagnetic material such as stainless steel, invar steel, and aluminum.

Looking at the action of the tank sealing wall automatic welding device of the LS ship configured as described above are as follows.

First, a scaffolding device for work is installed inside the LNG tank 1. The scaffolding device provides a workspace for facilitating the installation of the sealing walls 10a and 10b on the inner wall of the LNG tank 1, 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 20 to the sealing walls 10a and 10b. At this time, when the automatic welding device 20 supplies power, the fixing part 60 made of an electromagnet installed at both ends of the frame 30 is charged, and is attached by a force of magnetic force.

More preferably, the fixing jig 80 is coupled to the sealing walls 10a and 10b for attachment of the automatic welding device 20. To this end, the fixing jig 80 is supported by the support member 85 installed below the sealing walls (10a, 10b) is supported in the space between the curved concave and convex constrained movement. Next, the fastening member 84 is inserted into the upper surface of the fixing jig 80 to fasten with the sealing walls 10a and 10b.

When the fixing jig 80 is fixed, the fixing part 60 of the automatic welding device 20 is positioned on the plane of the fixing jig 80, and power is supplied to fix the fixing part 60. Attach to the plane of the jig 80.

Thus, the installed automatic welding device 20 is the guide portion 50 and the welded portion 40 in the state in which the sensing roller 52 of the guide portion 50 detects the lower end of the overlapping sealing wall (10a) Do it. At this time, the pressing roller 54 of the sensing roller 52 moves along the connection portions of the sealing walls 10a and 10b and detects a welding line, and the pressure roller 37 of the sensing roller 52 presses the pressing roller 54. The overlapping sealing walls 10a and 10b are pressed against each other so that the roller 54 moves along the bottom surface of the sealing wall 10a.

Next, when the guide unit 50 and the welding unit 40 proceed, the gas required for the welding operation of the welding unit 40 is supplied from the gas supply unit 43 to the welding torch 45 to generate a flame. At this time, the flame of the welding torch 45 melts a part of the overlapping sealing walls 10a and 10b and welds the overlapping sealing walls 10a and 10b without a gap therebetween. In addition, the welding torch 45 of the welding part 40 may move in a state of maintaining a constant distance from the surfaces of the sealing walls 10a and 10b by the rotating roller 49 as the height adjusting part.

Meanwhile, as an example of inert gas, argon (Ar) gas is supplied to the welding chamber 46 positioned at the rear of the welding torch 45 to maintain the welding position in an inert atmosphere.

As such, when the welding operation of the sealing walls 10a and 10b is completed, the automatic welding device 20 of the present invention disconnects the automatic welding device 20 by cutting off the power supplied to the fixing part 60. . Then, the fixing jig 80 is removed by removing the bolt 56 that fastens the fixing jig 80.

Meanwhile, the aforementioned sealing walls 10a and 10b may be provided in the form of a pre-assembly in which a plurality of sealing members are pre-welded before being installed on the inner wall of the LNG tank 1 by the automatic welding device 20. .

11 is a block diagram illustrating a process of installing a sealing wall using the sealing wall preliminary assembly method according to the present invention. Referring to Figure 11, the pre-welding method of the sealing walls (10a, 10b) installed in the insulation system of the cargo tank of the LNG vessel is composed of the following steps.

The preliminary welding method includes a step of providing a sealing member, a preliminary welding step, and a main welding step.

First, the step of preparing the sealing walls (10a, 10b) is provided with a sealing member having an appropriate shape according to the shape of the heat insulation system installed on the inner wall of the LNG tank (1). At this time, the sealing member is composed of a plurality, a number of bent portions 15 may be formed on the surface of the sealing member to prevent damage caused by contact with cryogenic liquid such as LNG. As such, the sealing member may be limited in its processing size to make the shape of the plurality of bends 15 and the like.

As such, when the sealing member is provided in the sealing wall (10a, 10b) provision step, it is subjected to a pre-welding step of connecting them. In the preliminary welding step, each sealing member is welded to each other to prepare a preliminary assembly having a suitable shape.

At this time, the pre-welding step is to prepare the pre-assembly by welding the connecting portion in the state in which each sealing member is disposed to each other. To this end, it is preferable to melt and weld the weld to the connecting portion of each sealing member.

When the preliminary welding step is completed, the main welding step of installing the preliminary assemblies of the sealing walls 10a and 10b on the inner wall of the LNG tank 1 is performed.

In the main welding step, the pre-assembly of the sealing walls 10a and 10b are disposed to overlap each other with a predetermined portion, and a part of the overlapping pre-assembly is melted to be welded with the lower pre-assembly.

It is a block diagram of the preliminary welding apparatus of the tank sealing wall of a LAN ship which concerns on this invention. 13 and 14 are a perspective view and a cross-sectional side view of the preliminary welding device for a sealing wall according to the present invention, the sealing wall preliminary welding device 100 is a working plate for placing a plurality of sealing members (110a, 110b) ( 102). And, the upper portion of the working plate 102 extends in the longitudinal direction, the frame 120 is fixed to both ends of the working plate 102 is installed. In addition, the sealing members 110a and 110b are inserted into the spaces between both ends of the frame 120 in both directions, and the ends thereof are in contact with each other. On the other hand, the frame 120 is provided with a fixing portion for fixing each of the sealing members (110a, 110b) disposed in contact with each other.

Here, the fixing portion is a pair of clamps 122 for pressing the upper surface of each of the sealing members (110a, 110b) disposed in contact with each other, the pressing device installed on the frame 120 to press the clamps 122 124.

The pressurizing device 124 includes a cylinder 124a in which the piston rod 124b is elastically installed. In this case, the cylinder 124a is installed in the frame 120, and one end of the piston rod 124b is connected to the fixing bolt 122 to expand and fix the fixing bolt 122 by the expansion and contraction of the piston rod 124b. Will move. In addition, the cylinder 124a may be a pneumatic cylinder or a hydraulic cylinder.

In addition, the welding part 130 is installed in the frame 120, and the welding part 130 includes a gas supply part supplying a welding gas, and a welding torch that burns the gas supplied from the gas supply part and generates a spark. 132. Here, the welding part 130 welds the connecting parts of the sealing members 110a and 110b which are disposed to be in contact with each other while moving along the frame 120 to connect the respective sealing members 110a and 110b.

In addition, the welding part 130 includes a welding bar supply device 140 for supplying the welding bar 142 to a connection part when the sealing members 110a and 110b are welded. The welding meat supply device 140 is the welding meat 142 is wound on the reel member in the form of a wire, the welding meat 142 by rotating the reel member in accordance with the traveling speed of the welding portion 130 Will be supplied.

In addition, the welding part 130 may further include a height adjusting part for maintaining a distance spaced from the sealing walls (10a, 10b), the height adjusting part is the welding part 130 is the sealing wall (10a, 10b) It is formed to a size corresponding to the distance to be spaced apart and includes a rotary roller 135 to move along the upper surface of the sealing member (110a, 110b).

On the other hand, the working plate 102 is provided with friction reducing means for reducing the friction with the surface during the movement of the sealing member (110a, 110b). For example, the friction reducing means may include a plurality of ball bearings 150 installed on the surface of the working plate 102, so that the sealing member (110a, 110b) by the ball bearing 150 It is supported and can move smoothly. In the embodiment of the present invention, the friction reducing means is disclosed as a configuration including a ball bearing 150, but is not limited to this, reducing the friction between the sealing member (110a, 110b) and the working plate 102 If you can do enough structure. Another example of such a friction reducing means is to form a plurality of air holes on the surface of the working plate 102, the air to be discharged through the hole by the sealing member (110a, 110b) of the working plate 102 It can be moved to the surface floating state, it is also possible to reduce the friction force.

As described above, the tank sealing wall automatic welding device of the LAN vessel according to the present invention has been described with reference to the illustrated drawings, but the present invention is not limited to the embodiments and drawings described above, the present invention within the claims Of course, various modifications and variations can be made by those skilled in the art. In addition, the tank sealing wall automatic welding device of the LNC ship 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 drying of LNG tanks such as pressure vessels, tanks or domes installed for land use have.

The tank sealing wall automatic welding device of the LUNK ship according to the present invention configured as described above can be automatically performed along the welding line of the sealing wall, thereby reducing labor costs due to welding work, even if not skilled workers Welding work with the same quality is possible and work safety is improved. In addition, the automatic welding device is easily removable inside the LNG tank has a good workability, there is an advantage that it is easy to move.

Claims (18)

A frame installed across the welded portion, Fixed parts installed at both ends of the frame and attached to the tank of the LNG vessel; 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; Located at the front end of the welding line of the welding portion, and provided with a sensing roller for sensing the connection portion of the sealing wall includes a guide for guiding the welding position of the welding portion, An automatic welding device for a tank sealing wall for an LNG ship, characterized in that a welding operation for automatically installing a sealing wall inside the tank of the LNG ship is performed. The method according to claim 1, The welding portion and the guide portion is coupled to the frame and the movable portion, The tank sealing wall automatic welding device of the LAN ship, characterized in that it further comprises a lifting portion which is provided in the coupling portion to adjust the height of the welding portion and the guide portion. The method according to claim 2, The coupling portion and the leg portion installed in the longitudinal direction along the frame, A connection block movably coupled along the frame; An automatic welding device for a tank sealing wall of a LAN ship, characterized in that it comprises a rotary gear unit which is driven by a motor installed in the connecting block and meshes with the rack portion. The method according to claim 2, The lifting unit and the motor installed in the coupling unit, An extension shaft connected to the rotation shaft of the motor and having a screw portion at an outer circumference thereof; A moving part formed on an inner circumferential surface and corresponding to the extension shaft to be inserted into the extension shaft; Including a case fixed to the welded portion and the guide portion and embedded to suppress the rotation of the movable body, And a movable member inserted into the extension shaft when the motor rotates, and elevates the welded portion and the guide portion fixed to the case. The method according to claim 4, The case has a through hole penetrating a predetermined hollow portion and the center of the hollow portion therein, The movable body and the operation knob is inserted into the through hole, And one end of the operating knob extending in a direction orthogonal to the shaft and including an engaging portion for elevating in the hollow portion. The method according to claim 5, The lifting unit further includes a pressure sensing unit for sensing the pressure in which the guide portion is in close contact with the sealing wall to adjust the distance the welding portion or the guide portion is spaced apart from the sealing wall. Welding equipment. The method according to claim 6, The pressure sensing unit is installed on the inside of the case tank sealing wall automatic welding device of the LUN vessel, characterized in that it comprises a pressure sensor for measuring the pressure in contact with the lower end of the locking portion when the moving body is lowered. The method according to any one of claims 1 to 7, Tank fixing wall automatic welding device of the LAN ship, characterized in that the fixing portion comprises an electromagnet. The method according to any one of claims 1 to 7, The sealing wall is installed so that one end overlaps with another adjacent sealing wall, The sensing roller moves along the lower end of the overlapping sealing wall and the tank sealing wall automatic welding device of the LUN vessel, characterized in that for guiding the weld. The method according to claim 9, And the sensing roller is an inclined roller that detects a welding position of the sealing wall while rolling along the lower end of the overlapping sealing wall. The method according to claim 10, The sensing roller further comprises a push roller for pressing the upper surface of the overlapping sealing wall and in close contact with the lower sealing wall. The method according to any one of claims 1 to 7, The welding portion is connected to the gas supply and the body portion capable of adjusting the distance from the sealing wall; And a welding torch installed in the body part to ignite the gas supplied from the gas supply part. The method according to claim 12, And a welding chamber positioned at the rear of the welding torch to maintain the welding position of the sealing wall in an inert gas atmosphere. The method according to claim 13, An inert gas tank sealing wall automatic welding device of an LS vessel, characterized in that the argon gas. The method according to any one of claims 1 to 7, The welding unit of the tank sealing wall automatic welding device of the LUN ship, characterized in that further comprising a height adjustment for maintaining a distance from the sealing wall. The method according to claim 15, The height adjusting portion is formed of a size corresponding to the distance that the welding portion is spaced apart from the sealing wall tank sealing wall automatic welding device of the LUN vessel characterized in that it comprises a rotating roller moving along the upper surface of the sealing wall. The method according to any one of claims 1 to 7, And a fixed jig fixed to a wall surface or a sealing wall of the LNG tank, the fixing jig providing a flat surface to which the fixed portion is attachable. The method according to claim 17, The fixing jig is installed in the lower portion of the tank sealing wall automatic welding device for a LAN ship, characterized in that it comprises a support member having a shape corresponding to the wall surface or the sealing wall.

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