KR101322977B1 - Apparatus and method for manufacturing membrane sheet of liquified natural gas storage tank - Google Patents

Abstract

PURPOSE: A device and a method for manufacturing a membrane sheet for an LNG storage tank are provided to improve productivity in comparison with the existing device. CONSTITUTION: A device for manufacturing a membrane sheet for an LNG storage tank includes a front end unit (100), a large corrugation molding unit (200), a small corrugation molding unit (300), a conforming unit (400), a chamfering and juggling unit (500), and an inspection unit (600). A first transfer robot transferring a base steel sheet is installed on the front end unit. A large corrugation molding press is installed on the large corrugation molding unit. The small corrugation molding unit includes first and second small corrugation molding presses. The conforming unit includes a third transfer robot, a first conforming press, and a second conforming press. The chamfering and juggling unit is composed of a chamfering press, a large corrugation juggling press, and a small corrugation juggling press. The inspection unit inspects the surface of the base steel sheet.

Description

Technical Field [0001] The present invention relates to an apparatus and a method for manufacturing a membrane sheet for a liquefied natural gas storage tank,

The present invention relates to an apparatus for producing a membrane sheet for a liquefied natural gas storage tank. More particularly, the present invention relates to an apparatus and a method for manufacturing a membrane sheet for a liquefied natural gas storage tank that can improve productivity through a new layout.

In general, LNG ships for transporting liquefied natural gas (LNG) are equipped with storage tanks using insulation material directly on the hull. These storage tanks have various forms, but the MARK-III method, which is a method of installing a membrane on the inner wall of a tank, is widely used. In this Mark-III method, a plurality of membrane sheets are successively installed on a secondary barrier made of heat insulating material on the inner wall of the tank to form a membrane as a primary barrier.

The membrane sheet 50 is shown in Fig. The primary barrier formed by such a membrane sheet is in direct contact with the liquefied natural gas. In order to effectively cope with plastic deformation due to the hydrostatic pressure of the membrane in contact with the liquefied natural gas and thermal contraction caused when the natural gas is kept at a low temperature for liquefaction, The sheet 50 is formed with a large corrugation 51 and a small corrugation 52. The sheet 50 has a large corrugation 51 and a small corrugation 52. In the portion where the large corrugated portion 51 and the small corrugated portion 52 meet, (Not shown). A conventional process for manufacturing such a membrane sheet 50 is shown in Fig.

Referring to FIG. 2, a flow chart illustrating a process of fabricating a conventional membrane sheet 50 for a liquefied natural gas storage tank is shown. In order to manufacture the membrane sheet 50, a base steel sheet 60 having a shape as shown in Fig. 3 is prepared (S100). The base steel sheet 60 is supplied to a press for forming the corrugated portion to form the base corrugated portion 51 (S200). A press for forming such a large corrugated portion is disclosed in Korean Patent No. 10-0743472. The base steel sheet in the state in which the base wrinkle portion 51 is formed is supplied to the small wrinkle portion and the intersection molding press to simultaneously form the small wrinkle portion 52 and the intersection 53 at S300. Such a small-wrinkled portion and an intersection forming press are disclosed in Korean Patent No. 10-0763309. After that, in the conforming press, shapes such as the curved portions of the main wrinkle portion 51 and the small wrinkled portion 52 are formed so that the shape of the final major wrinkled portion 51 and the small wrinkled portion 52 (S400). Fig. 4 shows a change in cross-sectional shape of the large-wrinkled portion 51 by the conformation process. The cross-sectional shape of the main wrinkle portion 51 formed by step S100 has a shape as shown on the left side of FIG. 4, and the cross-sectional shape of the major wrinkle portion 51 after the conforming process has the same shape as the right side of FIG. .

The next process is a chamfering and / or jogging process (S500) wherein the chamfering is to cut the rim of the membrane sheet and the jiggling is a process to impart a step to the overlapping portion of the membrane sheet, Depending on the desired shape of the membrane sheet, these two operations or any one operation may be omitted. The manufactured membrane sheet is subjected to visual inspection (S600), and if it does not have any abnormality, it is shipped to the final product (S700).

In this process, the membrane sheet is produced. In a conventional process, two workers directly carry the membrane sheet at each process step, while a transfer robot is used for automation. However, even if a transfer robot is simply applied, size cutting, deburring, chamfering, and juggling of the base steel sheet must be performed in separate positions. As shown in Fig. 5, ribs 57a, 57b and 57c are formed on the front side of the main wrinkle portions 51a, 51b and 51c, and the main wrinkle portion jaws 55, And chamfered edges 54a and 54b are formed on only one side of the product, when the membrane sheet of a special type is manufactured, the membrane sheet is installed at a separate position It has to be transferred to each device, which limits the workability and productivity.

In order to solve the above-described problems, the present inventor proposes a new apparatus for manufacturing a membrane sheet for a liquefied natural gas storage tank, in which the layout of each apparatus is effectively configured.

An object of the present invention is to provide an apparatus and a method for producing a membrane sheet for a liquefied natural gas storage tank having a layout capable of improving productivity.

The above objects and other intrinsic objects of the present invention can be easily achieved by the present invention described below.

The apparatus for producing a membrane sheet for a liquefied natural gas storage tank according to the present invention comprises

A front end portion provided with a first transfer robot for transferring a base metal sheet;

A main wrinkle forming unit provided at one side of the front end and provided with a main wrinkle forming press for forming a main wrinkle portion on the base steel sheet transferred by the first transfer robot;

A second transfer robot which is installed on one side of the main wrinkle forming part and transfers the base steel sheet formed with the main wrinkle part; a first small wrinkle part forming press provided on both sides of the second transfer robot, A small-bore forming part including a sub-forming press;

A third transfer robot which is provided on one side of the small wrinkled portion and transfers the base steel sheet from the small wrinkled portion forming portion, and a first conformation pressing and a second conforming press provided on both sides of the third transfer robot, A conformation portion including a first electrode and a second electrode; And

An inspection unit installed at one side of a fourth transfer robot that transfers the base steel sheet formed by the forming unit and installed with an inspection table for inspecting the appearance of the base steel sheet;

Characterized in that consists of.

In the present invention,

A chamfering press installed at one side of the fourth transfer robot;

A large wrinkle juggling press installed at one side of the fourth transfer robot; And

Small wrinkle juggling press is installed on one side of the fourth transfer robot;

It may further comprise a chamfering and juggling portion consisting of.

The present invention may further include a release pitch small wrinkle juggling press provided on one side of the small wrinkle juggling press.

In the present invention, the front end portion

A supply unit installed at one side of the first transfer robot to supply a base steel sheet;

A shear press installed at one side of the first transfer robot to shear an edge of the base steel sheet;

A turnover unit installed on one side of the first transfer robot and including a seat holder for flipping the rear surface of the base steel plate upward; And

A buffer unit installed at one side of the first transfer robot and configured to place a base steel sheet having a rear surface thereof upward;

It may further include.

In the present invention, the first conforming unit turnover unit is installed on one side of the first forming press for inverting the upper surface and the rear surface of the base steel sheet; And

A second conforming unit turnover unit installed on one side of the second conforming press to flip an upper surface and a rear surface of the base steel sheet;

It may further include.

A method of manufacturing a membrane sheet for a liquefied natural gas storage tank according to the present invention comprises:

Forming a base corrugation on the base steel sheet;

Sequentially forming a plurality of rows of small wrinkles and intersections on the base steel sheet having the base corrugations formed thereon; And

Sequentially forming a curved portion from the side of the small-sized corrugated portion formed last by changing the front and rear sides of the small-sized corrugated portion and the cross-section-formed base metal sheet toward the first small-sized corrugated portion;

And a control unit.

The present invention has the effect of providing an apparatus and a method for producing a membrane sheet for a liquefied natural gas storage tank having a layout capable of improving productivity.

1 is a perspective view showing an example of a membrane sheet for a liquefied natural gas storage tank.
2 is a flow chart showing a process sequence for manufacturing a conventional membrane sheet.
3 is a perspective view showing a base material steel sheet for manufacturing a membrane sheet for a liquefied natural gas storage tank.
4 is a conceptual view showing a process of forming a shape of a corrugated portion on a membrane sheet.
5 is a perspective view showing another example of a membrane sheet for a liquefied natural gas storage tank.
6 is a plan view showing the entire layout of an apparatus for producing a membrane sheet for a liquefied natural gas storage tank according to the present invention.
7 is a front view for explaining the operation of the turn-over unit at the front end of the apparatus for producing a membrane sheet for a liquefied natural gas storage tank according to the present invention.
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

6 is a plan view showing the entire layout of an apparatus for producing a membrane sheet for a liquefied natural gas storage tank according to the present invention.

6, an apparatus for producing a membrane sheet for a liquefied natural gas storage tank according to the present invention includes a front end portion 100, a main wrinkle portion molding portion 200, a small wrinkle portion molding portion 300, A chaser 400, a chamfering and juggling unit 500, and an inspection unit 600.

The front end portion 100 is a device for shearing the base material steel sheet 60 to a required size and supplying it to the main wrinkle forming portion 200. The front end portion 100 includes a feed unit 111, a front end press 112, a turnover unit 113, a buffer unit 114, and a defective stacking unit 113, which are disposed on one side of the transfer unit 110, (115).

The transfer unit 110 is configured so that the first transfer robot 10 can transfer the base steel sheet 60 to each part. Preferably, the first transfer robot 10 is configured to perform linear motion on the rail 11. [ 6, the rail 11 is arranged in the y-axis direction, but the first transfer robot 10 is provided with the main wrinkle portion forming portion 200 (FIG. 6) so that the base material steel sheet 60 can be supplied to the main wrinkle portion forming portion 200 The rails 11 of the transfer unit 110 may be arranged in the x-axis direction or the other direction as long as the first transfer robot 10 can be positioned on one side of the transfer robot 10. In this specification, as shown in Fig. 6, a description will be given in a form arranged in the y-axis direction.

The first transfer robot 10 performs a forward and a backward linear motion on the rail 11 in the y-axis direction. In this specification, 'left' and 'right' refer to '-x' and '+ x' directions, 'forward' and 'rear' refer to '+ y' and ' y 'direction, and' upper 'and' lower 'directions are used to indicate' + z 'and' -z 'directions.

The feed unit 111 is a place where the base material steel sheet 60 is fed, and a plurality of base material steel sheets 60 are stacked. The first transfer robot 10 picks up and transfers the base material steel sheets one by one. The base material steel sheet can be transported in any direction of the x, y, and z axes within the travel path and the working radius of the first transfer robot 10. The base steel sheet of the supply unit 111 is transferred to the shear press 112. In the shear press 112, adjacent two sides of the base steel sheet are cut and cut to the required size. The cut base metal sheet is transferred to the turnover unit 113 by the first transfer robot 10 again. The base steel sheet processed in the shear press 112 has a downward burr which is turned upside down in the turnover unit 113 such that the burr is directed upward. This is because, when forming the main wrinkle portion, the small wrinkle portion and the intersection portion of the membrane sheet, the punch shape of the press has a shape protruding downward, these wrinkle portions are processed into a shape protruding downward. A detailed configuration of the first transfer robot 10 and the turnover unit 113 is shown in Fig.

Referring to Fig. 7, the first transfer robot 10 has a robot arm 102 rotatably mounted on the robot main body 101 in the xz plane. The robot arm 102 may include at least one joint 105 that makes its end rotatable on the xz plane. At least one sheet attracting plate 103 is provided at the end of the robot arm 102. The sheet adsorption plate 103 serves to adsorb and pick up the base material steel sheet 60. For this purpose, a pneumatic cylinder or a vacuum pump or the like for making the inside of the sheet sucking plate 103 into a vacuum state may be included. A sheet rotating means 104 is provided on the robot arm 103 for allowing the sheet attracting plate 103 to rotate about the robot arm 103 in a state in which the base material steel sheet 60 is attracted. The robot main body 101 can be rotated around the z-axis direction by the robot main body rotating means 106. [ The robot main body 106 also has a y-axis moving means 107 for movement in the y-axis direction on the rail 11. [ The configuration of the first transfer robot 10 is the same as the configuration of the third transfer robot 30 and the fourth transfer robot 40. The second transfer robot 20 does not have the y- And has the same configuration as that of the first transfer robot 10.

The base steel sheet 60 to be attracted to and conveyed by the sheet attracting plate 103 provided at the end of the robot arm 102 is moved along at least one or more of the sheets held in the sheet holder 1132 of the turn- The robot arm 102 is attached to the holder attracting plate 1133, and the base steel plate 60 is placed thereon. The base material steel plate 60 is attached to the sheet holder attracting plate 1133 of the sheet holder 1132 so that the sheet holder 1132 is rotated in the B direction by the sheet holder rotating means 1134 to rotate the base material steel plate 60 And is placed on the upper plate 1131 of the turnover unit 113. The sheet holder 1132 rotates back to its original position after placing the base steel plate on the upper plate. In this way, the back surface 60e of the base material steel sheet 60 is turned upside down.

The base material steel sheet 60 inverted in the turnover unit 113 is transferred to the buffer unit 114 by the first transfer robot 10 and the appearance state of the base material steel sheet is checked in the buffer unit 114, Defective unit 115. In case of a good product, the first transfer robot 10 is transferred to the main wrinkle forming unit 200. [ At this time, the long side 60c or 60e of the base material steel sheet is forwardly directed to the main wrinkle forming unit 200. [

The main wrinkle part forming part 200 includes a main wrinkle part forming press 200 '. The large-bore forming press 200 'includes punches and die dies for forming the top and bottom wrinkles. The shape of the mold, the structure of the press, and the like are easily configurable by those skilled in the art to which the present invention belongs. Therefore, detailed description thereof will be omitted.

In the present invention, the main wrinkle portion formed in the main wrinkle forming press 200 'is formed so as to be directed downward from the upper side. In the left side view of FIG. 4, the base corrugated portion is shown facing upward, but in reality it is molded downward, and the curved portions R1, R2, R3 ) Is processed.

The first major wrinkle portion 51a, the second major wrinkle portion 51b, and the third major wrinkle portion 51c are sequentially processed in the main wrinkled portion forming unit 200. [ Since a general membrane sheet has three major wrinkles, it is described on the basis of forming three major wrinkles, but it is not necessarily limited to three major wrinkles. The base steel sheet finished in the main wrinkle part forming part 200 is conveyed to the small wrinkle part forming part 300 with three large wrinkled parts.

6, the small wrinkle part forming part 300 includes the first small wrinkle part forming press 310 and the second small wrinkle part forming press 320 around the second transfer robot 20, Are arranged in the form of facing each other. In this manner, the two small-wrinkled part forming presses can be operated, and the productivity can be improved.

A front mounting table 311 is provided on the rear side of the first small crimp forming press 310 and a rear mounting table 312 is provided on the front side of the first small crimp forming press 310. When the base steel plate already formed on the front mounting table 311 is transported by the second transfer robot 20, the base steel plate is moved by the pitch transporting means provided on the front mounting table 311 to the first small- And is conveyed at a pitch by the forming press 310. The pitch conveying means serves to push the base steel sheet at a pitch that is the interval between the adjacent two small pleats. As the base steel sheet is fed one pitch at a time, small rows and small rows are formed in order from the first row of small columnar corrugations 52a to the eight rows of small columnar corrugations 52h. To this end, the first small crimp forming press 310 includes punch and die dies for forming small pleats and intersections in the top and bottom molds. The shape of the mold, the structure of the press, the pitch conveying means, and the like can be easily configured by those skilled in the art, so a detailed description thereof will be omitted.

When both the small corrugated portion and the intersecting portion are formed, the base steel sheet is placed on the rear stage table 312. Similarly, a front mounting table 321 is provided on the rear side of the second small-wrinkle part forming press 320, and a rear mounting table 322 is provided on the front side of the second small-wrinkle part forming press 310. These operations are the same as in the case of the first small-bore forming press 310.

The second transfer robot 20 transfers the base steel sheet formed with the base corrugations to the front mounting table 311 of the first small crimp forming press 310 and the front mounting table 321 of the second small crimp forming press 320 ) So that one base metal sheet can be formed in the second small bellows molding press 320 while the other base metal sheet is being formed in the first small bellows molding press 310, .

The base steel sheet having the main corrugated portion, the small corrugated portion and the intersection portion is conveyed to the conformation portion 400, which is the next process. The conformation unit 400 includes a first conformational press 410, a second conforming press 420 and a third transfer robot 31 as shown in FIG.

4, the first conformational press 410 has the shape of the main wrinkle portion 51 and the small wrinkle portion 52 having the shape as shown in the left side of FIG. 4, (R1, R2, R3). Therefore, the upper mold and the lower mold have a mold corresponding to the shape. The front mounting table 411 is provided in front of the first molding press 410 and the rear mounting table 412 is provided in the rear. The front mounting table 411 is provided with a pitch feeding means for feeding the base steel plate forward one pitch at a time. A first conformational sub turnover unit 413 for inverting the base steel sheet is provided on one side of the front stage table 411.

The second molding press 420 also functions as the first molding press 410. The front mounting table 421 is mounted on the front of the second molding press 420 and the rear mounting table 422 is mounted on the rear side of the second molding press 420. [ Respectively. The front mounting table 421 is provided with a pitch feeding means for feeding the base steel plate forward one pitch at a time. And a second conformational sub turnover unit 423 for inverting the base steel sheet is provided on one side of the front stage table 421.

The third transfer robot 31 is mounted on the rear mounting table 312 of the first small wrinkle molding press 310 of the small wrinkle molding part 300 and the rear mounting table 312 of the second small wrinkle molding press 320 322 from the side of the front mounting table 411 of the first conforming press 410 and the side of the front mounting table 421 of the second conforming press 420 of the conformaing unit 400 to the y- On the rail 31 installed so as to be able to move. The base steel sheet having the small corrugated portion and the intersection portion is supplied to the conforma- tion portion 400 by the third transfer robot 30. [ At this time, the third transfer robot 30 changes the direction of the rear side of the base material steel plate so as to be forward, and transfers it to the front mounting tables 411 and 421 of the conforma- tion unit 400. [ That is, the conforming process is performed such that the eighth column small-wrinkled portion 51h formed at the first rear side of the base material steel plate faces the frontmost position. This is to improve the quality of the final product by compensating the cumulative tolerance that is generated sequentially during the small wrinkle part formation while performing the conforming process.

A first conformational sub-turnover unit 413 is provided on one side of the front mounting table 411 of the first molding press 410, And a second conformational sub turnover unit 423 is provided on one side. The first conformational sub-turnover unit 413 and the second conforming sub-turnover unit 423 are for reversing the base steel sheet again and supplying the same to the molding press. The turn-over unit of the front end 100 113).

The base material steel plate finished in the curved surface portion in the conforma- tion unit 400 is placed on the rear mounts 412 and 422 and is transferred to the chamfering and juggling unit 500 by the fourth transfer robot 40. [ That is, the fourth transfer robot 40 transfers the base material steel sheet from the back of the conforma- tion unit 400. [

The chamfering and juggling portion 500 selectively operates according to the shape of the membrane sheet. That is, when it is necessary to form the chamfered edges 54a and 54b on the membrane sheet as shown in FIG. 5, when it is necessary to form the large-pleated jug 55 or the small-pleated jug 56, Or when it is necessary to form the ribs 57a, 57b, 57c at one end of the main wrinkle portion, the operation is performed in the chamfering and juggling portion 500.

The chamfering and juggling portion 500 comprises a transfer unit 510, a third conforming press 520, a chamfering press 530, a major wrinkle juggling press 540 and a small wrinkle juggling press 550 And may optionally further include a modified pitch small-bodied jigging press 560.

The transfer unit 510 includes a fourth transfer robot 40 which moves on a rail 41 provided for conveying the formed base steel sheet in the conforma- tion unit 400. [

The third forming press 520 is installed at one side of the transfer unit 510 and the chamfering press 530 is installed at one side of the third forming press 520. The other side of the third forming press (520) is provided with a main folding jigging press (540).

The third molding press 520 is applied to the case where the ribs 57a, 57b and 57c need to be formed in the main wrinkle portion on the side of the first thermally small bellows portion 52a as shown in Fig. The fourth transfer robot 40 supplies the base steel sheet to the third forming press 520 to perform a molding operation. The third molding press 520 includes a punch having a rib shape and a die die. The forming of the rib is performed simultaneously with the forming process, and the rib may or may not be formed depending on the punch and die shape of the molding press. Further, since the punch and the die mold can be operated by being replaced if necessary, ribs can be formed in the first and second conforming presses 410 and 420.

The chamfered press 530 is for forming the chamfered edges 54a and 54b and is installed at one side of the transfer unit 510. The fourth transfer robot 40 transfers the end portion of the base material steel plate to the chamfering press 530), the edge portion is cut by the operation of the punch.

The main folding jigging press 540 is formed on one side of the transfer unit 510 and forms the main folding jig 55, which is formed as necessary in the end portion of the membrane sheet including the shape of the main folding portion. The main folding jigging press 550 includes a punch and die die corresponding to the shape of the main folding jig 55.

The small crimp portion juggling press 550 is formed at one side of the transfer unit 510 and forms a small crimp portion jugle 56 which is formed as necessary in the end portion of the membrane sheet including the shape of the small crimp portion. The small-bore portion juggling press 550 includes a punch and a die corresponding to the small-bore jug 56 shape.

The differential-pitch small-bodied jigging press 560 is provided on one side of the transfer unit 510 and forms a small-bodied jig that conforms to the shape of the small-bodied portion when the pitch thereof is different. The modified pitch small-bodied jigging press 560 includes a punch and a die corresponding to the shape of the small-bodied juggle having the release pitch.

If the shape of the required membrane sheet is not in the shape of any one of the chamfered edge, jugle, and rib, then neither of the chamfering and juggling portions 500 is machined. In this case, the fourth transfer robot 40 directly transfers the processed base metal sheet to the inspection unit 600 in the conforming unit 400.

The base material steel sheet finished in the chamfering and juggling portion 500 becomes the membrane sheet 50 as an end product. The membrane sheet 50 is conveyed to the inspection unit 600 before final shipment.

The inspection unit 600 includes a conveyor 610, a first inspection table 620, a third inspection table 630, and a shipping table 640 as a place for inspecting the membrane sheet.

The conveyor 610 is a device for transferring the membrane sheet 50 to the first inspection table 620. In the first inspection table 620, the appearance state, pitch, processing tolerance, and the like of the membrane sheet are measured. The second inspection table 630 inspects the appearance and the like of the back surface of the membrane sheet. The membrane sheet 50 having passed the inspection of the first inspection table 620 and the second inspection table 630 is loaded on the shipping table 640 and finally shipped. The first sheet holder 660, the second sheet holder 670, and the third sheet 640 to transfer the membrane sheet 50 to the first inspection table 620, the second inspection table 630 and the shipping table 640. [ The transfer unit 650 including the holder 680 may be provided on the upper part.

It is to be noted that the detailed description of the present invention described above is merely an illustration of one embodiment for the understanding of the present invention, and is not intended to define the scope of the present invention. It is intended that the scope of the invention be defined by the claims appended hereto, and that all such modifications and variations are intended to be included within the scope of the present invention.

10: first transfer robot 20: second transfer robot
30: Third transfer robot 40: Fourth transfer robot
11, 31, 41: rail 50: membrane sheet
60: base metal plate 100: front end portion
110: transfer unit 111: supply unit
112: shear press 113: turnover unit
114: buffer unit 115: defective storage unit
200: large wrinkled part forming part 300: small wrinkled part forming part
310: first small pleated portion forming press 320: second small pleated portion forming press
311, 321: front mount table 312, 322: rear mount table
400: Conforming part 410: First conforming press
420: second forming press 411, 421: front mounting table
412, 422: a rear mount table 413: a first conformational sub turnover unit
423: second conformational sub turnover unit 500: chamfering and juggling unit
510: transfer unit 520: third conforming press
530: chamfering press 540: jigging press
550: Small pleated juggling press
560: Distinctive pitch small crimp juggling press
600: Inspector 610: Conveyor
620: First examination zone 630: Second examination zone
640: shipment stack 650: transfer unit

Claims (6)

A front end portion provided with a first transfer robot for transferring a base metal sheet;
A main wrinkle forming unit provided at one side of the front end and provided with a main wrinkle forming press for forming a main wrinkle portion on the base steel sheet transferred by the first transfer robot;
A second transfer robot which is provided at one side of the main wrinkle forming part and transfers the base steel sheet formed with the main wrinkle part; a first small wrinkle part forming press provided on both sides of the second transfer robot, A small-bore forming part including a sub-forming press;
A third transfer robot provided at one side of the small wrinkle forming part and transferring the base steel sheet from the small wrinkle forming part, and a first conforming press and a second forming press provided at both sides of the third transfer robot; Conforming unit comprising a; And
An inspection unit installed at one side of a fourth transfer robot that transfers the base steel sheet formed by the forming unit and installed with an inspection table for inspecting the appearance of the base steel sheet;
Lt; / RTI >
A chamfering press installed at one side of the fourth transfer robot;
A large wrinkle juggling press installed at one side of the fourth transfer robot; And
Small wrinkle juggling press is installed on one side of the fourth transfer robot;
Further comprising a chamfering and juggling portion made of,
The third transfer robot moves between the first and second conforming presses of the conforming portion from one side of the first and second small wrinkle forming presses of the small wrinkle forming press. Apparatus for producing membrane sheet for natural gas storage tank.
delete The apparatus for manufacturing a membrane sheet for a LNG storage tank according to claim 1, further comprising a release pitch small wrinkle juggling press installed at one side of the small wrinkle juggling press.
The method of claim 1, wherein the front end portion
A supply unit installed at one side of the first transfer robot to supply a base steel sheet;
A shear press installed at one side of the first transfer robot to shear an edge of the base steel sheet;
A turnover unit installed on one side of the first transfer robot and including a seat holder for flipping the rear surface of the base steel plate upward; And
A buffer unit installed at one side of the first transfer robot and configured to place a base steel sheet having a rear surface thereof upward;
Apparatus for producing a membrane sheet for liquefied natural gas storage tank further comprising a.
The apparatus of claim 1, further comprising: a first conforming unit turnover unit installed on one side of the first conforming press to flip an upper surface and a rear surface of the base steel sheet; And
A second conforming unit turnover unit installed on one side of the second conforming press to flip an upper surface and a rear surface of the base steel sheet;
Apparatus for producing a membrane sheet for liquefied natural gas storage tank further comprising a.
delete

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