A pre-coating forming structure of a LNG storage tank inner wall stamping corrugated plate

Abstract

The utility model discloses a kind of pre-coating forming structures of LNG storage tank inner wall stamping corrugated board, it is related to liquefied natural gas storage tank inner wall metal shielding layer manufacturing technical field, the utility model is provided with coating device, and in coating device, adopt Bernoulli chuck adsorption leveling protective film, utilize non-contact negative pressure principle, ensure that protective film is evenly stressed, smooth in the process of gluing, with the glue transfer in the continuous rotation process of annular gluing tape, can realize the even, quantitative coating of glue on protective film, significantly improve the stability and consistency of coating quality, can be before metal corrugated board base material stamping forming, beforehand on its upper and lower surface accurately and stably stick protective film, form physical isolation layer, to fundamentally avoid the generation of friction mark, indentation, scratch and microcrack etc. Defects, greatly guarantee the original cleanliness and integrity of plate surface.

Description

Technical Field

[0001] This utility model relates to the field of manufacturing technology of metal shielding layer for inner wall of liquefied natural gas storage tank, and in particular to a pre-coated film forming structure for a stamped corrugated plate for inner wall of LNG storage tank. Background Technology

[0002] As a core shielding component, the stainless steel stamped corrugated plate on the inner wall of the LNG storage tank is in long-term contact with cryogenic liquefied natural gas. Therefore, the cleanliness and flatness of the plate surface are subject to strict requirements. During the processing, scratches, rust, dents and other defects are strictly prohibited.

[0003] Currently, the industry generally uses traditional stamping processes to process corrugated plates. During processing, the stainless steel sheet comes into direct contact with the mold, which easily leads to defects such as friction marks, indentations, surface scratches, and micro-cracks. These problems are difficult to completely eliminate, requiring multiple surface treatment processes after the workpiece is formed. This not only makes the process cumbersome but also easily causes secondary pollution, further reducing the cleanliness of the plate surface. Furthermore, due to the limitations of existing processes, the quality consistency of corrugated plates produced in batches is poor, making it impossible to consistently meet the defect-free use standards for LNG contact grade. Ultimately, this makes it difficult to guarantee the quality of the formed products, thus restricting the large-scale, high-quality production of shielding layer components for the inner wall of LNG storage tanks.

[0004] To address these issues, a pre-coating forming structure for the stamped corrugated plate on the inner wall of an LNG storage tank is proposed to solve some of the problems existing in the prior art. Utility Model Content

[0005] The purpose of this invention is to solve the defects in the existing technology of LNG storage tank inner wall stamping process, such as friction marks, indentations, plate surface scratches and microcracks, and to propose a pre-coated forming structure for LNG storage tank inner wall stamping corrugated plate.

[0006] To address the problems existing in the prior art, the present invention adopts the following technical solution: A pre-coating forming structure for a corrugated sheet stamped on the inner wall of an LNG storage tank includes a coating device and a stamping die. The coating device includes a body, within which a first pressing roller and a support roller are rotatably mounted on the same horizontal plane, and a metal corrugated sheet substrate is conveyed on the first pressing roller and the support roller. A second pressing roller is installed inside the body and positioned directly above the first pressing roller, pressing the metal corrugated sheet substrate. An upper film mounting mechanism and a first guide roller corresponding to the upper film mounting mechanism are installed at the upper position inside the body. A lower film mounting mechanism corresponding to the support roller is installed at the lower position inside the body. An injection port is fixedly installed on the body, and corresponding guide rollers are fixedly installed inside the body. Between the guide rollers and between the lower film mechanism and the support rollers, there is a support plate. The bottom of the support plate is provided with evenly distributed Bernoulli suction cups, and the Bernoulli suction cups are connected to an external air pump. The machine body is equipped with a glue coating mechanism corresponding to the Bernoulli suction cups. The glue coating mechanism includes conveyor rollers that are symmetrically rotated and installed in the machine body. A ring glue coating belt is driven between the two conveyor rollers. The left conveyor roller is located on the left side below the corresponding support plate. The machine body is equipped with a glue coating roller located on the top right side of the ring glue coating belt. The glue coating roller includes a roller. A channel is opened at the central axis position inside the roller. Evenly distributed glue outlets are opened on the cylindrical surface of the roller. The glue outlets are connected to the channel, and the channel is connected to the glue injection port.

[0007] Preferably, a frame is connected to the machine body for lifting, a second pressing roller is rotatably installed inside the frame, and an adjustment mechanism for driving the lifting and adjusting of the frame is fixedly installed on the machine body.

[0008] Preferably, a second guide roller is rotatably mounted on both the left and right sides of the bearing plate.

[0009] Preferably, the glue application mechanism further includes an electric slide rail fixedly installed above the annular glue application belt inside the machine body, and a connecting frame is fixedly installed on the sliding end of the electric slide rail, with the glue application roller installed inside the connecting frame.

[0010] Preferably, the connecting frame has shaft seats that are lifted and connected to the front and rear sides. The front and rear ends of the roller are rotatably connected to the front and rear shaft seats respectively. The shaft seats have chambers that are rotatably connected to the channel. The chambers are connected to the glue injection port through a pipe. A cylinder for driving the shaft seats to lift and adjust is fixedly installed on the connecting frame.

[0011] Preferably, the roller is equipped with multiple evenly distributed ring plates, with one ring plate positioned between two adjacent glue outlets.

[0012] Preferably, the cylindrical surface of the roller has annular grooves that correspond one-to-one with multiple ring plates. The ring plates are movably installed in the corresponding annular grooves, and multiple springs are fixedly installed in the annular grooves, which are distributed in a ring. The springs are used to provide elastic support for the corresponding ring plates.

[0013] Preferably, a plurality of support rollers are rotatably installed inside the machine body and disposed between corresponding two conveying rollers, the support rollers being rolled and supported within the annular coating belt.

[0014] Compared with the prior art, the beneficial effects of this utility model are: 1. In this utility model, by setting up a film coating device and using a Bernoulli suction cup to adsorb and level the protective film in the film coating device, the non-contact negative pressure principle is used to ensure that the protective film is subjected to uniform force and flatness during the glue coating process. With the addition of a precisely controllable glue coating mechanism, the glue transfer during the continuous rotation of the annular glue coating belt can achieve uniform and quantitative coating of the adhesive on the protective film, which significantly improves the stability and consistency of the film coating quality. The protective film can be precisely and stably applied to the upper and lower surfaces of the metal corrugated plate substrate before stamping, forming a physical isolation layer, so that the mold and the stainless steel plate do not directly contact each other during the subsequent stamping process, thereby fundamentally avoiding the generation of defects such as friction marks, indentations, scratches and micro-cracks, and greatly ensuring the original cleanliness and integrity of the plate surface. 2. In this utility model, by integrating the coating device upstream of the stamping die, the coating process can be moved forward and integrated into the stamping production line, which helps to optimize the process flow, reduce the subsequent cumbersome surface treatment and repair steps, not only improve production efficiency, but also effectively eliminate the risk of secondary contamination of the formed product, so that the formed corrugated plate can directly meet the defect-free standard of LNG contact grade, and powerfully promote the high-quality and large-scale production of shielding layer components for the inner wall of LNG storage tanks. Attached Figure Description

[0015] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a perspective view of the coating device of this utility model; Figure 2 This is a cross-sectional view of the coating device of this utility model; Figure 3 This utility model Figure 2 Enlarged view of point A in the middle; Figure 4 This is a perspective view of the two glue-applying mechanisms of this utility model in conjunction with the corresponding support plate; Figure 5 This is a perspective view of a single adhesive application mechanism of this utility model in conjunction with a corresponding support plate; Figure 6 This utility model Figure 5 A breakdown diagram of the middle structure; Figure 7 This is an exploded view of the coating roller of this utility model; Figure 8 This is a cross-sectional view of the coating roller of this utility model; Figure 9 This utility model Figure 8 Enlarged view of point B in the middle.

[0016] In the picture: 1. Machine body; 11. First pressing roller; 12. Support roller; 13. Second pressing roller; 14. Frame; 15. Adjustment mechanism; 16. Film mounting mechanism; 17. First guide roller; 18. Film unmounting mechanism; 19. Glue inlet; 2. Carrier plate; 21. Bernoulli suction cup; 22. Second guide roller; 3. Glue coating mechanism; 31. Conveying roller; 32. Annular glue coating belt; 33. Glue coating roller; 331. Roller; 332. Channel; 333. Glue outlet; 334. Ring plate; 335. Annular groove; 336. Spring; 34. Electric slide rail; 35. Connecting frame; 36. Shaft seat; 37. Cylinder; 38. Support roller. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0018] Example: This example provides a pre-coated film forming structure for a stamped corrugated plate on the inner wall of an LNG storage tank. See [link to example]. Figure 1 - Figure 9Specifically, the system includes a laminating device and a stamping die. The laminating device includes a machine body 1. Inside the machine body 1, a first pressing roller 11 and a support roller 12 are rotatably mounted on the same horizontal plane, and a corrugated metal substrate is conveyed on the first pressing roller 11 and the support roller 12. Inside the machine body 1, a second pressing roller 13 is installed directly above the first pressing roller 11, and the second pressing roller 13 presses against the corrugated metal substrate. Inside the machine body 1, a film mounting mechanism 16 is installed at the upper position, and a first guide roller 17 is arranged corresponding to the film mounting mechanism 16. A film-removing mechanism 18, corresponding to the idler roller 12, is installed at the lower part of the machine body 1. An adhesive inlet 19 is fixedly installed on the machine body 1. A support plate 2, corresponding to the second pressure roller 13 and the first guide roller 17, and between the film-removing mechanism 18 and the idler roller 12, is fixedly installed inside the machine body 1. The bottom of the support plate 2 has evenly distributed Bernoulli suction cups 21, each connected to an external air pump. An adhesive-applying mechanism 3, corresponding to the Bernoulli suction cups 21, is installed inside the machine body 1. The adhesive-applying mechanism 3 includes left-right symmetrical rotation... A conveyor roller 31 is installed inside the machine body 1. An annular coating belt 32 is connected between two conveyor rollers 31. The left conveyor roller 31 is located on the left side below the corresponding support plate 2. A coating roller 33 is installed inside the machine body 1 and is located on the top right side of the annular coating belt 32. The coating roller 33 includes a roller 331. A channel 332 is opened at the central axis position inside the roller 331. The cylindrical surface of the roller 331 has evenly distributed glue outlets 333, and the glue outlets 333 are connected to the channel 332. The channel 332 is connected to the glue injection port 19. In this connected device, the forming surface of the precision stamping die undergoes mirror polishing and hardening treatment, resulting in a surface roughness Ra≤0.025μm and a hardness ≥HRC60. In the laminating device, the upper film mounting mechanism 16 and the lower film mounting mechanism 18 are used to mount the roll-shaped protective film and control its unwinding tension. The protective film layer is made of high-temperature resistant, transparent fluorine or PET composite film that meets the requirements of die heating during stamping and has a stamping elongation rate ≥30%. The surface of the protective film is free of impurities and crystal points, and its thickness uniformity deviation is ≤±1μm. (See reference...) Figure 2As shown, the upper protective film, guided by the first guide roller 17, passes from right to left under the upper support plate 2 and then adheres to the top of the corrugated metal substrate. The lower protective film passes from left to right under the lower support plate 2, and after being guided by the idler roller 12, adheres to the bottom of the corrugated metal substrate. The first pressing roller 11 and the idler roller 12 jointly support and guide the corrugated metal substrate to move horizontally from right to left. The corrugated metal substrate is usually austenitic stainless steel sheet. Before rolling, at the position below the support plate 2, the film... Through the corresponding adhesive coating mechanism 3, adhesive can be applied to the upper and lower protective films. The selected adhesive is a stable epoxy or polyurethane pressure-sensitive adhesive with a bonding strength ≥1.5N / 25mm and a high-temperature stamping temperature resistance of 120–180℃. It has the advantages of not delaminating, not cracking, and not releasing small molecules. In actual operation, the adhesive is injected through the injection port 19, transported through the pipeline, and enters the channel 332 inside the coating roller 33. Finally, it exits from multiple evenly distributed adhesive outlets 33 on the cylindrical surface of the roller 331. In step 3, during uniform extrusion, an adhesive layer is uniformly adhered to the annular coating belt 32 during the relative rotation of roller 331 and annular coating belt 32. A motor for driving the rotation of conveyor roller 31 is fixedly installed inside the machine body 1. The moving speed of the protective film, the rotation speed of the annular coating belt 32, and the rotation speed of roller 331 are matched to each other. Subsequently, with the continuous rotation of the annular coating belt 32, the adhesive layer adhered to the annular coating belt 32 is uniformly and stably transferred to the protective film below the support plate 2. The protective film is then applied to the metal corrugated plate substrate, and then the second pressing roller 13 cooperates with the first pressing roller 11 to perform a rolling operation on the protective film on the upper and lower sides, ensuring that the film is firmly adhered. Through the above operation, the protective film and the adhesive layer are fully laminated before stamping and are precisely and stably attached to the upper and lower surfaces of the metal corrugated plate substrate. The film is stamped and formed synchronously with the metal corrugated plate substrate. Before the corrugated plate is welded and used, the film layer and the adhesive layer are removed. The adhesive layer and the film layer are peeled off together, making it convenient to use and providing strong protection.

[0019] In the specific implementation process, such as Figure 1 and Figure 2 As shown, a frame 14 is vertically connected to the machine body 1, and a second pressing roller 13 is rotatably installed inside the frame 14. An adjustment mechanism 15 for driving the frame 14 to rise and fall is fixedly installed on the machine body 1. In this device, the adjustment mechanism 15 adopts a screw and nut structure for linear drive. The screw is fixedly connected to the frame 14, while the nut is rotatably installed above the machine body 1. By rotating the nut, the frame 14 can be driven to rise and fall through the thread engagement between the nut and the screw. By driving the frame 14 to rise and fall, the second pressing roller 13 is driven to move closer to or away from the first pressing roller 11. This allows the device to adapt to the pressing requirements of metal corrugated sheet substrates of different thicknesses, and the magnitude of the pressing force during the rolling process can be flexibly adjusted through the lifting and lowering adjustment.

[0020] In the specific implementation process, such as Figure 2 and Figure 4 - Figure 6 As shown, second guide rollers 22 are rotatably installed on both the left and right sides of the bearing plate 2. In this device, the second guide rollers 22 can be used to assist in guiding the direction of the protective film, ensuring that the protective film is scratched and damaged before entering the Bernoulli suction cup 21 area, and helping to ensure the smoothness of the protective film during movement, so that it can be smoothly connected with the annular coating belt 32 and subsequent processes.

[0021] In the specific implementation process, such as Figure 2 - Figure 6 As shown, the adhesive coating mechanism 3 also includes an electric slide rail 34 fixedly installed above the annular adhesive coating belt 32 inside the machine body 1, and a connecting frame 35 is fixedly installed on the sliding end of the electric slide rail 34. The adhesive coating roller 33 is installed in the connecting frame 35. In this device, the adhesive coating roller 33 can be driven to move and adjust along the length direction of the annular adhesive coating belt 32, that is, in the left and right direction, through the electric slide rail 34. This allows the initial position of the adhesive after it is extruded and falls on the annular adhesive coating belt 32 to be adjusted. This allows the adhesive to have a period of settling and leveling time before it moves with the annular adhesive coating belt 32 to contact the protective film. This settling period helps to make the adhesive layer more uniform. Furthermore, the length of this settling time can be controlled by adjusting the position of the adhesive coating roller 33 through the electric slide rail 34, so that the adhesive can be adapted to different production needs and the control flexibility of the device during operation can be improved to a certain extent.

[0022] In the specific implementation process, such as Figure 3 - Figure 7 As shown, the connecting frame 35 has shaft seats 36 that are lifted and lowered on both the front and rear sides. The front and rear ends of the roller 331 are rotatably connected to the two shaft seats 36 respectively. The shaft seats 36 have a chamber that is rotatably connected to the channel 332. The chamber is connected to the glue injection port 19 through a pipe. The connecting frame 35 is fixedly installed with a cylinder 37 for driving the shaft seats 36 to lift and lower. In this device, the cylinder 37 can drive the shaft seats 36 together with the glue coating roller 33 to lift and lower as a whole, thereby adjusting the gap between the lower end face of the glue coating roller 33 and the upper surface of the annular glue coating belt 32. By adjusting this distance, the glue coating gap can be adjusted to control the thickness of the glue layer coated on the annular glue coating belt 32. In this device, by setting a chamber in the shaft seat 36 that is rotatably connected to the channel 332, it can be ensured that the adhesive can be continuously and stably supplied from the glue injection port 19 to the channel 332 when the roller 331 rotates, thus ensuring the operational stability of the device to a certain extent.

[0023] In the specific implementation process, such as Figure 3 and Figure 7 - Figure 9As shown, multiple evenly distributed annular plates 334 are installed on the roller 331. One annular plate 334 is positioned between two adjacent glue outlets 333. Annular grooves 335, corresponding one-to-one with the multiple annular plates 334, are formed on the cylindrical surface of the roller 331. The annular plates 334 are movably installed within their respective annular grooves 335. Multiple springs 336, arranged in a circular pattern, are fixedly installed within the annular grooves 335. The springs 336 provide elastic support for the corresponding annular plates 334. Multiple support rollers 38, positioned between corresponding two conveying rollers 31, are rotatably installed inside the machine body 1. The support rollers 38 roll and support the annular coating belt 32. In this device, the annular coating belt 32 is driven to circulate by the conveying rollers 31, and its inner surface is supported by the multiple support rollers 38, effectively ensuring the flatness of the top of the annular coating belt 32. In this device, the annular plates 334 on the coating roller 33 are supported by the springs 336. The adhesive is slightly pressed against the surface of the annular coating belt 32, which allows the adhesive extruded from the dispensing nozzle 333 to be evenly divided on the cylindrical surface of the roller 331, forming strip-shaped adhesive lines in the area between two adjacent ring plates 334. Subsequently, with the movement of the annular coating belt 32 and the rotation of the coating roller 33 itself, the numerous strip-shaped adhesive lines are flattened into a continuous and uniform adhesive film, which can further improve the uniformity of the adhesive layer formation. Furthermore, the elastic support of the ring plate 334 by the spring 336 allows it to adapt to different distance gaps between the coating roller 33 and the annular coating belt 32, which helps to ensure the uniformity of adhesive application under the gap. Finally, when the area of ​​the annular coating belt 32 with adhesive is moved to the left end, that is, when the Bernoulli suction cup 21 adsorbs and fixes the protective film, the adhesive film is transferred to the flat and taut protective film surface, and the transfer operation of the adhesive layer is completed precisely and smoothly.

[0024] Specifically, the working principle of this utility model is as follows: First, the rolled upper and lower protective films are installed on the upper film mounting mechanism 16 and the lower film mounting mechanism 18, respectively. The equipment is started, and the upper protective film is guided by the first guide roller 17 and the lower protective film is guided by the support roller 12. They pass through the area below the corresponding support plate 2. The external air pump of the Bernoulli suction cup 21 is started to generate negative pressure, which adsorbs and levels the protective film passing below without contact. At the same time, the corrugated metal substrate is sent into the machine body 1 and supported and transported by the first pressing roller 11 and the support roller 12. The glue supply system of the glue injection port 19 is opened, and the adhesive is pumped into the channel 332 of the coating roller 33. According to the process requirements, the lateral position of the coating roller 33 above the annular coating belt 32 is adjusted by the electric slide rail 34. The gap between the coating roller 33 and the annular coating belt 32 is adjusted by the cylinder 37. The motor of the drive conveyor roller 31 is started to make the annular coating belt 32 circulate at a uniform speed.

[0025] During the rotation of the coating roller 33, adhesive is extruded from the glue outlet 333, restricted by the ring plate 334 on it, and rolled onto the surface of the annular coating belt 32 to form a uniform adhesive layer. The area of ​​the annular coating belt 32 carrying the adhesive layer moves to the left end and comes into contact with the protective film adsorbed by the Bernoulli suction cup 21. The adhesive film is completely transferred to the surface of the protective film. Subsequently, the upper protective film with adhesive meets the upper surface of the metal corrugated plate substrate conveyed to the left, and the lower protective film with adhesive meets the lower surface of the metal corrugated plate substrate. Under the rolling action of the second pressing roller 13 and the first pressing roller 11, they are firmly bonded together. Finally, the metal corrugated plate substrate with protective film pre-coated on both sides is sent out of the coating device and enters the subsequent stamping die for corrugation forming. After stamping, before welding and use, the protective film can be peeled off to obtain a high-quality corrugated plate with no mold contact damage on the surface.

[0026] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A pre-coating forming structure for a corrugated sheet stamped on the inner wall of an LNG storage tank, comprising a coating device and a stamping die, wherein the coating device comprises a body (1), wherein a first pressing roller (11) and a support roller (12) are rotatably mounted on the same horizontal plane inside the body (1), and a metal corrugated sheet substrate is conveyed on the first pressing roller (11) and the support roller (12), wherein a second pressing roller (13) is installed inside the body (1) and positioned directly above the first pressing roller (11), and the second pressing roller (13) presses against the metal corrugated sheet substrate, wherein an upper film mounting mechanism (16) is installed at the upper position inside the body (1), and a first guide roller (17) is arranged corresponding to the upper film mounting mechanism (16), wherein a lower film mounting mechanism (18) is installed at the lower position inside the body (1) and is arranged corresponding to the support roller (12), and an injection port (19) is fixedly installed on the body (1), characterized in that: The machine body (1) is fixedly installed with a support plate (2) corresponding to the second pressing roller (13) and the first guide roller (17), and between the film lowering mechanism (18) and the support roller (12). The bottom of the support plate (2) is provided with evenly distributed Bernoulli suction cups (21), and the Bernoulli suction cups (21) are connected to an external air pump. The machine body (1) is installed with a glue coating mechanism (3) corresponding to the Bernoulli suction cups (21), and the glue coating mechanism (3) includes conveying rollers (31) that are symmetrically rotated and installed in the machine body (1). The two conveying rollers (31) are connected to each other. A ring-shaped adhesive tape (32) is connected to the moving sleeve. The conveying roller (31) on the left side is set on the left side below the corresponding bearing plate (2). The body (1) is equipped with an adhesive roller (33) set on the top right side of the ring-shaped adhesive tape (32). The adhesive roller (33) includes a roller (331). A channel (332) is opened at the central axis position inside the roller (331). The cylindrical surface of the roller (331) is provided with uniformly distributed glue outlets (333). The glue outlets (333) are connected to the channel (332). The channel (332) is connected to the glue injection port (19).

2. The pre-coated film forming structure of the stamped corrugated plate for the inner wall of an LNG storage tank according to claim 1, characterized in that: The machine body (1) is connected to a frame (14) for lifting and lowering. The second pressing roller (13) is rotatably installed inside the frame (14). The machine body (1) is fixedly installed with an adjustment mechanism (15) for driving the frame (14) to lift and adjust.

3. The pre-coated film forming structure for the stamped corrugated plate of the inner wall of an LNG storage tank according to claim 1, characterized in that: The bearing plate (2) is rotatably mounted with second guide rollers (22) on both the left and right sides.

4. The pre-coated film forming structure of the stamped corrugated plate for the inner wall of an LNG storage tank according to claim 1, characterized in that: The glue application mechanism (3) also includes an electric slide rail (34) fixedly installed above the annular glue application belt (32) inside the machine body (1), and a connecting frame (35) is fixedly installed on the sliding end of the electric slide rail (34), and the glue application roller (33) is installed inside the connecting frame (35).

5. The pre-coated film forming structure for the stamped corrugated plate of the inner wall of an LNG storage tank according to claim 4, characterized in that: The connecting frame (35) has shaft seats (36) that are lifted and lowered on both the front and rear sides. The front and rear ends of the roller (331) are rotatably connected to the front and rear shaft seats (36) respectively. The shaft seat (36) has a chamber that is rotatably connected to the channel (332), and the chamber is connected to the glue injection port (19) through a pipe. The connecting frame (35) is fixedly installed with a cylinder (37) for driving the shaft seat (36) to lift and adjust.

6. The pre-coated film forming structure for the stamped corrugated plate of the inner wall of an LNG storage tank according to claim 1, characterized in that: The roller (331) is equipped with a plurality of evenly distributed ring plates (334), and one of the ring plates (334) is disposed between two adjacent glue outlets (333).

7. The pre-coated film forming structure for the stamped corrugated plate of the inner wall of an LNG storage tank according to claim 6, characterized in that: The cylindrical surface of the roller (331) is provided with annular grooves (335) corresponding to multiple annular plates (334). The annular plates (334) are movably installed in the corresponding annular grooves (335). Multiple springs (336) are fixedly installed in the annular grooves (335) and are distributed around each other. The springs (336) are used to provide elastic support for the corresponding annular plates (334).

8. The pre-coated film forming structure for the stamped corrugated plate of the inner wall of an LNG storage tank according to claim 1, characterized in that: The machine body (1) is rotatably installed with a plurality of support rollers (38) arranged between two corresponding conveying rollers (31), and the support rollers (38) are rolled and supported in the annular coating belt (32).

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