Longitudinal coiling welding process and equipment for outer tank of LNG (Liquefied Natural Gas) low-temperature tank box

Abstract

The invention relates to the technical field of welding equipment, and provides an LNG low-temperature tank outer tank longitudinal roll welding process and device.The LNG low-temperature tank outer tank longitudinal roll welding device comprises a rack, a shape fixing assembly, a material pushing assembly and a welding assembly; the outer arc clamping plate and the inner arc clamping plate are used for clamping arc-shaped wall plates so as to fix the shapes of the arc-shaped wall plates, the two shape fixing assemblies can slide towards the center and gather together so as to splice the two arc-shaped wall plates into a shell ring, and the welding assembly is located on a moving path of a longitudinal joint and used for welding the longitudinal joint. Due to the fact that the shape of the arc-shaped wall plate is fixed through the shape fixing assembly all the time in the welding process, the correct shape of the shell ring can be kept, gaps of longitudinal joints can be kept uniform, and therefore the welding quality is improved. By means of the technical scheme, the technical problem that in the prior art, after a plate is rolled into an arc-shaped wall plate, springback possibly occurs, and the longitudinal seam welding quality is affected is solved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of welding equipment technology, specifically to a longitudinal rolling welding process and equipment for the outer tank of an LNG cryogenic tank container. Background Technology

[0002] With the adjustment of the global energy structure and the continuous growth in demand for clean energy, liquefied natural gas (LNG) is playing an increasingly important role in the energy sector as an efficient and clean energy source. LNG cryogenic tank containers are important equipment for LNG storage and transportation.

[0003] The manufacturing of the outer tank of an LNG cryogenic tank container typically involves first rolling sheet metal into curved wall panels, then welding the longitudinal joints of these panels to form a cylindrical section. Multiple sections are then welded together to form the complete outer tank. Due to differences in the material properties of the sheet metal, such as elastic modulus and yield strength, a certain degree of springback may occur after the curved wall panels are rolled into curved panels. This can affect the welding quality of the subsequent longitudinal joints, leading to deviations in the roundness and straightness of the cylindrical sections, and even reducing the overall structural strength and stability of the tank container.

[0004] In conclusion, developing a welding equipment that can solve the springback problem of curved wall panels and improve the quality and production efficiency of longitudinal rolling welding of LNG cryogenic tank outer tank is of great practical significance and is crucial for promoting the development of the LNG industry. Summary of the Invention

[0005] To overcome the above-mentioned defects, embodiments of the present invention provide a longitudinal rolling welding process and equipment for the outer tank of an LNG cryogenic tank container, which solves the technical problem in the related art that springback may occur after the plate is rolled into an arc-shaped wall panel, affecting the welding quality of the longitudinal joint.

[0006] According to one aspect, at least one embodiment of the present invention provides a longitudinal rolling welding device for the outer tank of an LNG cryogenic tank container, used to weld the longitudinal joints of a sheet metal after it has been rolled into an arc-shaped wall panel, so as to obtain a cylindrical section used to assemble the outer tank. The assembly includes a frame, a shaping component, a feeding component, and a welding component. The shaping component includes an outer arc clamping plate and an inner arc clamping plate, both of which are arc-shaped. The outer arc clamping plate and the inner arc clamping plate are slidably mounted on the frame. The outer arc clamping plate and the inner arc clamping plate are used to clamp the arc-shaped wall panel to fix the shape of the arc-shaped wall panel. The shaping component is arranged in two sets in a circumferential array. The two sets of the shaping component can slide and converge towards the center so that the two arc-shaped wall panels can be spliced ​​together. The pushing assembly and the welding assembly are both mounted on the frame and located at both ends of the solidification assembly. The pushing assembly is used to push the two arc-shaped wall panels out of the solidification assembly simultaneously. There are two welding assemblies, each used to weld the longitudinal seam between two adjacent arc-shaped wall panels.

[0007] For example, in at least one embodiment of the present invention, an LNG cryogenic tank outer tank longitudinal rolling welding device further includes: The outer arc clamping plate and the inner arc clamping plate are both embedded with ball bearings on opposite sides. There are multiple ball bearings that are evenly distributed and are used to roll and cooperate with the arc-shaped wall plate.

[0008] For example, in at least one embodiment of the present invention, an LNG cryogenic tank outer tank longitudinal rolling welding device further includes: The pushing assembly includes a pushing frame and a pushing plate. The pushing frame is slidably mounted on the frame, and the pushing plate is mounted on the pushing frame. There are multiple pushing plates, which are staggered with several rows of ball bearings. The pushing plate can enter between the outer arc clamping plate and the inner arc clamping plate under the drive of the pushing frame, so as to push the arc-shaped wall panel out of the solid assembly.

[0009] For example, in at least one embodiment of the present invention, an LNG cryogenic tank outer tank longitudinal rolling welding device further includes: The solidification assembly consists of two sets. A bidirectional lead screw is connected between the two outer arc clamping plates. The two ends of the bidirectional lead screw are threaded to the two outer arc clamping plates respectively, which is used to drive the two outer arc clamping plates to converge towards the center synchronously. A spring is provided between the two inner arc clamping plates and the frame. The spring is used to provide the inner arc clamping plates with the force to approach the outer arc clamping plates.

[0010] For example, in at least one embodiment of the present invention, an LNG cryogenic tank outer tank longitudinal rolling welding device further includes: The frame is provided with multiple pads, and each pair of adjacent solid components is provided with one pad. When the solid components slide and converge toward the center, the pad can contact the part of the arc-shaped wall panel protruding from the side of the solid component and push it into the solid component.

[0011] For example, in at least one embodiment of the present invention, an LNG cryogenic tank outer tank longitudinal rolling welding device further includes: The pad is an electric heating plate, which is positioned in the longitudinal seam between two adjacent arc-shaped wall panels after the solid assembly is gathered to the center, so as to preheat the edge of the arc-shaped wall panel.

[0012] For example, in at least one embodiment of the present invention, an LNG cryogenic tank outer tank longitudinal rolling welding device further includes: Multiple conveying rollers are rotatably mounted on the frame. The conveying rollers are located at the discharge end of the solidification assembly and are used to carry the cylindrical sections pushed out from the solidification assembly. A lifting frame is slidably mounted on the frame, and a pressure roller is rotatably mounted on the lifting frame. The pressure roller is used to press down on the cylindrical sections.

[0013] For example, in at least one embodiment of the present invention, an LNG cryogenic tank outer tank longitudinal rolling welding device further includes: The welding assembly is equipped with a protective cover, and a waste gas collection pipe is connected to the protective cover. The waste gas collection pipe is used to connect to an external negative pressure unit.

[0014] For example, at least one embodiment of the present invention also provides a longitudinal rolling welding process for the outer tank of an LNG cryogenic tank container, comprising the following steps: S1. Curved wall panel splicing: The short side of the rectangular panel is rolled to obtain a curved wall panel. Two curved wall panels are fixed to two sets of fixed components respectively. The two sets of fixed components slide synchronously and converge to the center, so that the two curved wall panels are spliced ​​together in sequence along the circumference. S2, Longitudinal welding: Two arc-shaped wall panels are pushed out from the solid assembly, and the two adjacent arc-shaped wall panels are welded by the welding assembly to form a cylindrical section; S3. Circumferential seam welding between adjacent cylinder sections: Repeat steps S1 to S2 to obtain multiple cylinder sections, axially splice the multiple cylinder sections, and weld the circumferential seam between adjacent cylinder sections.

[0015] The beneficial effects of the embodiments of the present invention are as follows: In this invention, two arc-shaped wall panels are placed between the outer and inner arc-shaped clamping plates of two sets of fixed components, respectively, and the arc-shaped wall panels are tightly clamped by the outer and inner arc-shaped clamping plates. Because the arc shape of the outer and inner arc-shaped clamping plates matches the arc-shaped wall panels, the arc-shaped wall panels cannot spring back under clamping conditions, thus maintaining their correct shape. The two sets of fixed components are arranged in a circumferential array, allowing them to slide and converge towards the center, thereby splicing the two arc-shaped wall panels into a cylindrical section.

[0016] After the two curved wall panels are joined to form a cylindrical section, the pusher assembly pushes the section axially. During the section's movement, the welding assembly, located on the longitudinal joint's movement path, begins operation. The welding gun of the welding assembly welds along the longitudinal joint, while the wire feeding mechanism simultaneously feeds welding wire into the welding area. Under the action of the electric arc, the welding wire melts and fills the longitudinal joint, achieving the connection between adjacent curved wall panels. Because the curved wall panels maintain their shape throughout the welding process using the fixing assembly, the cylindrical section retains its correct shape, and the gap in the longitudinal joint remains uniform, thus improving the welding quality.

[0017] The shaping assembly, through the clamping of outer and inner arc-shaped plates, restricts the springback of the arc-shaped wall panels, ensuring the shape accuracy of the cylinder sections during splicing and welding. The roundness and straightness of the welded cylinder sections meet design requirements, guaranteeing the structural strength and stability of the LNG cryogenic tank outer tank and reducing safety hazards. This equipment achieves automated shaping, splicing, and welding of arc-shaped wall panels, reducing the time and workload of manual correction and adjustment, and improving production efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of the present invention and these drawings without any creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a longitudinal rolling welding device for the outer tank of an LNG cryogenic tank container in one embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram of the external structure of the solid component in the embodiment; Figure 3 for Figure 1 A schematic diagram of the pusher assembly in the embodiment; Figure 4 for Figure 1 A schematic diagram of the internal structure of the solid component in the embodiment; Figure 5 for Figure 1 The schematic diagram of the inner arc clamp in the embodiment is shown.

[0020] In the diagram: 1. Frame, 2. Solid assembly, 3. Pushing assembly, 4. Welding assembly, 201. Outer arc clamping plate, 202. Inner arc clamping plate, 203. Ball bearing, 5. Pushing frame, 6. Pushing plate, 7. Two-way lead screw, 8. Spring, 9. Pad, 10. Conveying roller, 11. Protective cover, 12. Exhaust gas collection pipe, 13. Lifting frame, 14. Pressure roller. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it.

[0022] To keep the drawings concise, each drawing only schematically shows the parts relevant to the invention; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0023] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0025] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0026] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] like Figures 1-5The diagram illustrates a longitudinal rolling welding device for the outer tank of an LNG cryogenic tank container according to an embodiment of the present invention. This device is used to weld the longitudinal joints of sheet metal after it has been rolled into an arc-shaped wall panel, thereby obtaining a cylindrical section used to assemble the outer tank. The device includes a frame 1, a solidification assembly 2, a pusher assembly 3, and a welding assembly 4. The frame 1 is the basic support structure of the entire welding device. The solidification assembly 2 includes an outer arc clamping plate 201 and an inner arc clamping plate 202, both of which are arc-shaped structures adapted to the shape of the arc-shaped wall panel. The pusher assembly 3 is mounted on the frame 1, located on one side of the solidification assembly 2. The moving direction of the pusher plate is consistent with the axial direction of the arc-shaped wall panels being assembled into a cylindrical section, enabling the simultaneous ejection of two arc-shaped wall panels from the solidification assembly 2. The welding assemblies 4 are also mounted on the frame 1, with the same number as the number of longitudinal joints between the arc-shaped wall panels, and each assembly is located one-to-one on the moving path of multiple longitudinal joints. Welding assembly 4 uses conventional industrial welding equipment, including a welding gun, a wire feeding mechanism, and a power supply. The welding gun is used to generate a welding arc for welding longitudinal joints; the wire feeding mechanism is responsible for feeding welding wire into the welding area; and the power supply provides the electrical energy required for welding. Working principle: Two arc-shaped wall panels are placed between the outer arc clamping plate 201 and the inner arc clamping plate 202 of the two sets of fixed components 2, respectively, and the arc-shaped wall panels are tightly clamped by the outer arc clamping plate 201 and the inner arc clamping plate 202. Since the arc shape of the outer arc clamping plate 201 and the inner arc clamping plate 202 is adapted to the arc-shaped wall panels, the arc-shaped wall panels cannot spring back in the clamped state, thus maintaining the correct shape. The two sets of fixed components 2 are arranged in a circumferential array and can slide and converge towards the center, thereby splicing the two arc-shaped wall panels into a cylindrical section.

[0028] After the two curved wall panels are joined to form a cylindrical section, the pusher assembly 3 pushes the section out axially. During the movement of the cylindrical section, the welding assembly 4, located on the longitudinal joint movement path, begins to work. The welding gun of the welding assembly 4 welds along the longitudinal joint, and the wire feeding mechanism of the welding assembly 4 simultaneously feeds welding wire into the welding area. Under the action of the electric arc, the welding wire melts and fills the longitudinal joint, realizing the connection between adjacent curved wall panels. Since the curved wall panels are always fixed in shape by the shaping assembly 2 during the welding process, the cylindrical section can maintain the correct shape, and the gap of the longitudinal joint can remain uniform, thereby improving the welding quality.

[0029] The shaping assembly 2, through the clamping of the outer arc clamp 201 and the inner arc clamp 202, restricts the springback of the arc-shaped wall panel, ensuring the shape accuracy of the cylinder section during splicing and welding. The roundness and straightness of the welded cylinder section meet design requirements, guaranteeing the structural strength and stability of the LNG cryogenic tank outer tank and reducing safety hazards. This equipment achieves automatic shaping, splicing, and welding of the arc-shaped wall panel, reducing the time and workload of manual correction and adjustment, and improving production efficiency.

[0030] In some examples, such as Figure 4 , 5 As shown, on the side opposite to the outer arc clamping plate 201 and the inner arc clamping plate 202, that is, the side in contact with the arc-shaped wall panel, several rows of ball bearings 203 are evenly embedded. The pushing assembly 3 consists of a pushing frame 5 and a pushing plate 6. The pushing frame 5 can slide on the frame 1, and there are multiple pushing plates 6, which are arranged on the pushing frame 5. The position of the pushing plate 6 on the pushing frame 5 is staggered from the several rows of ball bearings 203 on the outer arc clamping plate 201 and the inner arc clamping plate 202, that is, the position of the pushing plate 6 is located in the gap between two adjacent rows of ball bearings 203.

[0031] In this embodiment, the solidification assembly 2 is configured in two sets. A bidirectional lead screw 7 is connected between the two outer arc clamping plates 201, and the two ends of the bidirectional lead screw 7 are respectively threaded to the two outer arc clamping plates 201. The drive motor is connected to the bidirectional lead screw 7. When the drive motor starts, the bidirectional lead screw 7 rotates. Since the threads at both ends rotate in opposite directions, the two outer arc clamping plates 201 can synchronously converge towards the center. At the same time, springs 8 are provided between the two inner arc clamping plates 202 and the frame 1. One end of the spring 8 is fixed to the frame 1, and the other end is connected to the inner arc clamping plate 202, so that the inner arc clamping plate 202 always maintains a tendency to approach the outer arc clamping plate 201.

[0032] Working Principle: Before welding, two arc-shaped wall panels are placed between the outer arc clamping plate 201 and the inner arc clamping plate 202 of the two sets of fixed components 2, respectively. The drive motor is started, driving the bidirectional lead screw 7 to rotate. The bidirectional lead screw 7 drives the two outer arc clamping plates 201 to slide synchronously towards the center. As the outer arc clamping plates 201 move, they gradually approach the inner arc clamping plate 202 and, together with the inner arc clamping plate 202, clamp the arc-shaped wall panel. During this process, the inner arc clamping plate 202 is compressed by the outer arc clamping plate 201, while the spring 8 is gradually compressed. The elastic force of the spring 8 ensures that the inner arc clamping plate 202 and the outer arc clamping plate 201 fit tightly together, forming a stable clamping force on the arc-shaped wall panel, thereby fixing its shape and preventing it from springing back. Finally, the two sets of fixed components 2 are fastened together, splicing the two arc-shaped wall panels into a cylindrical section.

[0033] Under the action of the drive device, the pusher 5 moves towards the solid assembly 2. Since the pusher plate 6 is staggered with the rows of balls 203, when the pusher 5 approaches the solid assembly 2, the pusher plate 6 can insert between the rows of balls 203 and contact the arc-shaped wall panel. As the pusher 5 continues to move, the pusher plate 6 applies a pushing force to the arc-shaped wall panel, pushing the arc-shaped wall panel out of the solid assembly 2, thereby realizing the pushing of the cylinder section and preparing for the subsequent welding process.

[0034] During the ejection of the cylindrical section by the pusher assembly 3, relative sliding occurs between the arc-shaped wall plate and the outer arc clamping plate 201 and the inner arc clamping plate 202. Since ball bearings 203 are installed between the outer arc clamping plate 201, the inner arc clamping plate 202 and the arc-shaped wall plate, the ball bearings 203 roll under the influence of the arc-shaped wall plate as it moves. Compared to traditional sliding friction, this rolling friction significantly reduces frictional force, avoiding hard friction between the arc-shaped wall plate and the clamping plates, allowing the arc-shaped wall plate to move more smoothly.

[0035] In some examples, such as Figure 4 , 5 As shown, on the frame 1, a pad 9 is provided between every two adjacent sets of solid components 2. The pad 9 is rectangular in shape. The pad 9 can be in the form of an electric heating plate, with heating wires or other heating elements installed inside.

[0036] Working Principle: When the curved wall panel is placed between the outer curved clamping plate 201 and the inner curved clamping plate 202, due to operational errors or other factors, the curved wall panel may shift left and right, causing one end of the curved wall panel to protrude from the fixed assembly 2 after being clamped by the outer curved clamping plate 201 and the inner curved clamping plate 202. During the process of the two sets of fixed assemblies 2 sliding and converging towards the center, the protruding curved wall panel will first contact the pad 9. The pad 9 forms a block for the protruding curved wall panel, and under the blocking action of the pad 9, the curved wall panel can easily slide on the ball bearing 203, thereby restoring it to the correct position, ensuring the accurate position of the longitudinal joint of the curved wall panel after splicing, and ensuring that the subsequent welding assembly 4 can be accurately aligned with the longitudinal joint. The ball bearing 203 can adapt to the movement of the curved wall panel when it is pushed out by the pusher assembly 3, and can also adapt to the movement of the curved wall panel when adjusting the lateral position deviation.

[0037] As the two sets of solid components 2 continue to converge toward the center until they are fastened together, the pad 9 will be clamped between the two adjacent arc-shaped wall plates. At this time, the pad 9 is placed between the two arc-shaped wall plates to ensure that the interval of the longitudinal joint is uniform and consistent, thereby avoiding welding defects such as porosity, slag inclusion, and incomplete penetration caused by uneven joint gaps during the welding process, and improving the welding quality.

[0038] The pad 9 can be an electric heating plate. After the solid components 2 are gathered to the center, the heating element heats up and the temperature of the pad 9 gradually increases. The heat is transferred to the longitudinal joint of the two adjacent arc-shaped wall panels. Preheating the longitudinal joint can reduce the temperature difference, reduce welding stress, avoid defects such as cracks, and further improve the welding quality.

[0039] In some examples, such as Figure 1As shown, after the pusher assembly 3 pushes the cylindrical section out of the solidification assembly 2, the cylindrical section is directly supported by the conveyor roller 10. The conveyor roller 10 provides stable support for the cylindrical section. At the same time, the lifting frame 13 descends, causing the pressure roller 14 to press against the top of the cylindrical section, preventing the cylindrical section from being suspended and unstable after being pushed out, thus ensuring the stability of the cylindrical section during welding. The protective cover 11 can block the high temperature and spatter generated during welding, protecting the operators from injury. The exhaust gas collection pipe 12 is connected to an external negative pressure unit to create a negative pressure environment inside the protective cover 11, so that the exhaust gas generated during welding can be quickly drawn into the exhaust gas collection pipe 12 and then transported to the external exhaust gas treatment system for treatment, reducing environmental pollution.

[0040] In some examples, a longitudinal rolling welding process for the outer tank of an LNG cryogenic tank container is also shown, using the aforementioned longitudinal rolling welding equipment for the outer tank of an LNG cryogenic tank container, including the following steps: S1. Arc-shaped wall panel splicing: The short side of the rectangular plate is rolled to obtain an arc-shaped wall panel. Two arc-shaped wall panels are fixed to two sets of fixed components 2 respectively. The two sets of fixed components 2 slide and converge to the center simultaneously, so that the two arc-shaped wall panels are spliced ​​together in sequence along the circumference. S2, Longitudinal welding: Two arc-shaped wall panels are pushed out from the solid assembly 2, and the two adjacent arc-shaped wall panels are welded by the welding assembly 4 to form a cylindrical section; S3. Circumferential seam welding between adjacent cylinder sections: Repeat steps S1 to S2 to obtain multiple cylinder sections, axially splice the multiple cylinder sections, and weld the circumferential seam between adjacent cylinder sections.

[0041] The traditional rolling method for the outer tank is as follows: the long side of a rectangular plate is rolled, and the two short sides of the rectangular plate are joined and welded to obtain a cylindrical section. The number of longitudinal seams on the cylindrical section obtained by this rolling method is one, and the length of the short side of the rectangular plate is the length of the cylindrical section. Finally, after multiple cylindrical sections are axially spliced, a circumferential seam that needs to be welded will be formed between each two adjacent cylindrical sections. In this solution, the short side of the rectangular plate is rolled to obtain an arc-shaped wall panel. Several arc-shaped wall panels are spliced ​​together to form a cylindrical section. Taking two arc-shaped wall panels as an example, the number of longitudinal seams on the cylindrical section is two. However, the long side of the rectangular plate is the length of the cylindrical section. This means that the number of cylindrical sections required to form the final outer tank is reduced, that is, the number of circumferential seams is reduced.

[0042] Compared to longitudinal seams, circumferential seams are more difficult to weld and require more complex welding equipment. This solution, by changing the rolled edge of the rectangular plate, increases the number of relatively easy-to-weld longitudinal seams and reduces the number of difficult-to-weld circumferential seams, thereby reducing the overall difficulty of welding the outer tank.

[0043] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A longitudinal rolling welding device for the outer tank of an LNG cryogenic tank container, used to weld the longitudinal joints of a sheet metal after it has been rolled into an arc-shaped wall panel, so as to obtain the cylindrical sections used to assemble the outer tank. Its features are, The assembly includes a frame (1), a shaping component (2), a feeding component (3), and a welding component (4). The shaping component (2) includes an outer arc clamping plate (201) and an inner arc clamping plate (202), both of which are arc-shaped. The outer arc clamping plate (201) and the inner arc clamping plate (202) are slidably disposed on the frame (1). The outer arc clamping plate (201) and the inner arc clamping plate (202) are used to clamp the arc-shaped wall panel to fix the shape of the arc-shaped wall panel. The shaping component (2) consists of two sets arranged in a circumferential array. The two sets of shaping components (2) can slide and converge toward the center so that the two arc-shaped wall panels can be spliced ​​together. The pushing assembly (3) and the welding assembly (4) are both mounted on the frame (1) and located at both ends of the solidification assembly (2). The pushing assembly (3) is used to push the two arc-shaped wall panels out of the solidification assembly (2) simultaneously. The welding assembly (4) consists of two parts and is used to weld the longitudinal seam between two adjacent arc-shaped wall panels.

2. The longitudinal rolling welding equipment for the outer tank of an LNG cryogenic tank container according to claim 1, characterized in that, Roller balls (203) are embedded on the opposite sides of the outer arc clamping plate (201) and the inner arc clamping plate (202). There are multiple roller balls (203) evenly distributed, which are used to roll and cooperate with the arc-shaped wall plate.

3. The longitudinal rolling welding equipment for the outer tank of an LNG cryogenic tank container according to claim 2, characterized in that, The pushing assembly (3) includes a pushing frame (5) and a pushing plate (6). The pushing frame (5) is slidably mounted on the frame (1). The pushing plate (6) is mounted on the pushing frame (5). There are multiple pushing plates (6) and they are staggered with several rows of balls (203). The pushing plate (6) can enter between the outer arc clamp (201) and the inner arc clamp (202) under the drive of the pushing frame (5) to push the arc-shaped wall panel out of the solid assembly (2).

4. The longitudinal rolling welding equipment for the outer tank of an LNG cryogenic tank container according to claim 1, characterized in that, The solidification assembly (2) consists of two sets. A bidirectional lead screw (7) is connected between the two outer arc clamps (201). The two ends of the bidirectional lead screw (7) are threaded to the two outer arc clamps (201) respectively, and are used to drive the two outer arc clamps (201) to converge towards the center synchronously. A spring (8) is provided between the two inner arc clamps (202) and the frame (1). The spring (8) is used to provide the force for the inner arc clamps (202) to approach the outer arc clamps (201).

5. The longitudinal rolling welding equipment for the outer tank of an LNG cryogenic tank container according to claim 1, characterized in that, The frame (1) is provided with multiple pads (9), and each pair of adjacent solid components (2) is provided with a pad (9). When the solid components (2) slide and converge toward the center, the pad (9) can contact the part of the arc-shaped wall panel protruding from the side of the solid component (2) and push it into the solid component (2).

6. The longitudinal rolling welding equipment for the outer tank of an LNG cryogenic tank container according to claim 5, characterized in that, The pad (9) is an electric heating plate. After the solid assembly (2) is gathered to the center, the pad (9) is located in the longitudinal seam between two adjacent arc-shaped wall panels to preheat the edge of the arc-shaped wall panel.

7. The longitudinal rolling welding equipment for the outer tank of an LNG cryogenic tank container according to claim 1, characterized in that, Multiple conveying rollers (10) are rotatably arranged on the frame (1). The conveying rollers (10) are located at the discharge end of the solidification assembly (2) and are used to carry the cylindrical sections pushed out from the solidification assembly (2). A lifting frame (13) is slidably arranged on the frame (1). A pressure roller (14) is rotatably arranged on the lifting frame (13) and is used to press the cylindrical sections.

8. The longitudinal rolling welding equipment for the outer tank of an LNG cryogenic tank container according to claim 1, characterized in that, The welding assembly (4) is provided with a protective cover (11), and a waste gas collection pipe (12) is connected to the protective cover (11). The waste gas collection pipe (12) is used to connect to an external negative pressure unit.

9. A longitudinal rolling welding process for the outer tank of an LNG cryogenic tank container, using the longitudinal rolling welding equipment for the outer tank of an LNG cryogenic tank container as described in any one of claims 1 to 8, characterized in that, Includes the following steps: S1. Arc-shaped wall panel splicing: The short side of the rectangular plate is rolled to obtain an arc-shaped wall panel. The two arc-shaped wall panels are fixed to two sets of fixed components (2) respectively. The two sets of fixed components (2) slide together synchronously to the center, so that the two arc-shaped wall panels are spliced ​​together in the circumferential direction. S2, Longitudinal welding: Two arc-shaped wall panels are pushed out from the solid assembly (2) and welded by the welding assembly (4) to form a cylindrical section; S3. Circumferential seam welding between adjacent cylinder sections: Repeat steps S1 to S2 to obtain multiple cylinder sections, axially splice the multiple cylinder sections, and weld the circumferential seam between adjacent cylinder sections.

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