A production system and method for thin film plates of a liquefied natural gas thin film tank

Abstract

This invention discloses a production system and method for liquefied natural gas (LNG) membrane tank membrane panels. For processing closed corrugated panels, the system includes: a core frame slidably disposed within a mounting cavity of a shaping upper mold base; multiple shaping blocks matching the edge flat areas of the membrane panel; the core frame includes: a shaping cavity matching the central corrugations, central flat areas, and connecting corrugated areas of the membrane panel; a shaping punch, shaping blocks, and shaping cavity together form a shaping cavity for the membrane panel; the distance between the surface of the core frame away from the shaping upper mold base and the shaping upper mold base is greater than the distance between the surface of the shaping blocks away from the shaping upper mold base and the shaping upper mold base; when the shaping upper mold descends, the shaping cavity first closes with the shaping punch to press and shape the central corrugations, central flat areas, and connecting corrugated areas of the membrane panel to be shaped; as the shaping upper mold continues to descend, the shaping blocks close with the shaping punch to press and shape the edge flat areas of the membrane panel to be shaped. This improves the overall processing accuracy of the membrane panel.

Description

Technical Field

[0001] This invention relates to the field of cryogenic insulation storage technology, and in particular to a production system and method for membrane plates of liquefied natural gas membrane tanks. Background Technology

[0002] LNG (liquefied natural gas) storage tanks are indispensable and crucial storage facilities in the LNG industry chain. Membrane-type tanks offer significant advantages over fully enclosed tanks in terms of size, material consumption, construction period, and investment, and related technologies have developed rapidly in recent years. The inner tank's main shielding membrane plate is a key component that directly contacts the LNG. Its function is to isolate and seal the LNG and repeatedly absorb thermal expansion and contraction stresses through its own structure. It needs to possess high fatigue strength, thus placing high demands on the production of the membrane plate. Furthermore, the large quantity used necessitates mass production.

[0003] In existing technologies, film sheets with closed corrugated plate structures are generally manufactured through stamping; wherein, the closed corrugated plate is a structure that is square in shape but contains closed areas enclosed by circular or polygonal corrugations; see reference. Figure 1 As shown, a membrane plate structure of a square closed corrugated plate is provided, which includes: a central corrugation 2, a central flat plate region 12 formed inside the central corrugation, connecting corrugations (vertical corrugations 3 and horizontal corrugations 4 in the figure) provided on each side of the central corrugation, and edge flat plate regions 13 provided on the four edges of the membrane plate. Summary of the Invention

[0004] In the stamping process of producing closed corrugated sheet structures, the overall shaping of the film sheet is generally achieved by the upper and lower molds of the forming device in one step. After shaping, the film sheet is prone to springback deformation in the flat area of ​​the edges, resulting in low overall processing accuracy of the film sheet.

[0005] In view of the above problems, the present invention is proposed to provide a production system and method for liquefied natural gas membrane tank membrane plates that overcomes or at least partially solves the above problems.

[0006] The liquefied natural gas membrane tank membrane plate production system provided in this embodiment of the invention is used for processing membrane plates with enclosed corrugated plate structures, and includes: a shaping device;

[0007] The shaping device includes: an upper shaping mold and a lower shaping mold;

[0008] The upper shaping mold includes: an upper shaping mold base, a mold core frame, and multiple shaping blocks;

[0009] The core frame is slidably disposed in the mounting cavity of the upper forming mold base, and a nitrogen spring is provided between the mounting cavity and the core frame; the core frame includes: a frame and a forming die disposed in the frame, the forming die including: a forming cavity that matches the corrugations in the middle of the film plate, the flat plate in the middle and the connecting corrugated area;

[0010] The mounting cavity is provided with multiple mounting islands fixedly connected thereto, and the mold core frame is nested on the mounting islands; the shape of the shaping block matches the edge flat area of ​​the film plate and is correspondingly mounted on the mounting island;

[0011] The lower forming die is provided with a forming punch that matches the structure of the film plate; the forming punch, the forming block, and the forming cavity together form the forming cavity of the film plate;

[0012] The distance between the surface of the mold core frame away from the upper forming mold base and the upper forming mold base is greater than the distance between the surface of the forming block away from the upper forming mold base and the upper forming mold base. During the descent of the upper forming mold, the forming die, under the pressure of the nitrogen spring, closes with the forming punch to press and shape the middle corrugations, the central flat plate, and the connecting corrugated areas of the film plate to be formed. As the upper forming mold continues to descend, the mold core frame slides relative to the upper forming mold base, squeezing the nitrogen spring. The forming block and the forming punch close together to press and shape the edge flat plate area of ​​the film plate to be formed.

[0013] In an optional embodiment, the upper forming die further includes at least one connecting rod;

[0014] One end of the pull rod is fixedly connected to the upper shaping mold base;

[0015] Accordingly, the shaping cavity is provided with at least one pull rod hole, which is a stepped hole. The other end of the pull rod extends into the pull rod hole and can slide relative to the pull rod hole. The other end of the pull rod is provided with a limiting boss to cooperate with the stepped surface of the pull rod hole to axially limit the pull rod.

[0016] In an optional embodiment, the upper shaping mold further includes: a first guide structure;

[0017] The first guide structure is disposed on both sides of the upper forming mold base, and is provided with a plurality of first self-lubricating guide plates and a plurality of first guide blocks;

[0018] Accordingly, the lower forming die also includes: a second guide structure disposed on both sides of the lower forming die, wherein the second guide structure is provided with a plurality of second self-lubricating guide plates and a plurality of second guide blocks; so that the second self-lubricating guide blocks cooperate with the corresponding first guide blocks, and the second guide blocks cooperate with their corresponding first self-lubricating guide plates to form a moving guide between the upper forming die and the lower forming die.

[0019] In an optional embodiment, the upper surface of the second guide structure is provided with a plurality of limiting blocks and a plurality of nitrogen springs for controlling the descent stroke of the upper forming mold.

[0020] In an optional embodiment, the system provided by the present invention further includes: a drawing apparatus for drawing a blank of a film sheet;

[0021] The drawing apparatus includes: an upper drawing die and a lower drawing die;

[0022] The drawing die includes a drawing die; the drawing die includes a drawing cavity and a locking cavity disposed outside the drawing cavity;

[0023] The drawing die includes: a drawing die holder and a drawing punch disposed on the drawing die holder;

[0024] The drawing die includes: a drawing protrusion and a locking protrusion disposed outside the drawing protrusion;

[0025] The drawing protrusion and the drawing cavity are matched with the film sheet to be drawn. The drawing cavity, the drawing protrusion, the locking cavity and the locking protrusion together form the drawing forming cavity of the film sheet. The locking cavity and the locking protrusion are used to press the edge of the blank to be drawn during the drawing process.

[0026] In an optional embodiment, a third guide structure is provided on both sides of the drawing die;

[0027] The lower drawing die further includes: a blank holder, which is sleeved on the outside of the drawing punch. A push rod is provided below the blank holder, and a push rod through hole is provided on the lower drawing die base. The lower end of the push rod passes through the push rod through hole to contact the ejection mechanism of the stamping equipment.

[0028] The pressing device is provided with a fourth guide structure on both sides, and the drawing lower die base is provided with a fifth guide structure on the top; the fourth guide structure is used to cooperate with the third guide structure to form a guide between the pressing device and the drawing upper die, and to cooperate with the fifth guide structure to form a guide between the pressing device and the drawing lower die base.

[0029] Furthermore, the upper surface of the pressing device is provided with multiple limiting blocks and multiple positioning blocks; the positioning blocks are used to position the blank to be drawn, and the limiting blocks are used to control the downward stroke of the upper drawing die.

[0030] In an optional embodiment, the system provided by the present invention further includes: an edge trimming device for trimming the drawn film sheet;

[0031] The trimming device includes: an upper trimming die and a lower trimming die;

[0032] The trimming upper mold includes: a trimming upper mold base, a clamping die, and a trimming ring;

[0033] The trimming die includes: a clamping punch located in the middle;

[0034] The clamping punch includes: a clamping protrusion that matches the structure of the film plate, and a slit cut provided around the periphery of the clamping protrusion;

[0035] The clamping die is slidably disposed within the mounting cavity of the trimming upper die base, and it is provided with a clamping cavity that matches the structure of the film plate. The trimming ring is mounted on the upper die base and sleeved on the outside of the clamping die. The distance between the surface of the clamping die away from the trimming upper die base and the trimming upper die base is greater than the distance between the surface of the trimming ring away from the trimming upper die base and the trimming upper die base, so that during the downward movement of the trimming upper die, the clamping die and the clamping punch first close the die to clamp the film plate to be trimmed; as the trimming upper die continues to move downward, the film plate to be trimmed is sheared by the cooperation of the trimming ferrule and the trimming ring.

[0036] In an optional embodiment, a sixth guide structure is provided on both sides of the trimming upper mold base;

[0037] The sixth guide structure is provided with a guide sleeve, a third guide block, and a third self-lubricating guide plate;

[0038] Accordingly, a seventh guide structure is provided on both sides of the trimming lower die; the seventh guide structure is provided with a guide post, a fourth guide block, and a fourth self-lubricating guide plate, so as to form a vertical guide between the trimming upper die and the trimming lower die through the cooperation of the guide post and the guide sleeve; and to form a horizontal guide between the trimming upper die and the trimming lower die through the cooperation of the third guide block and the fourth self-lubricating guide plate, and the cooperation of the third self-lubricating guide plate and the fourth guide block.

[0039] In an optional embodiment, the system provided by the present invention further includes: a coating device and a material unloading device;

[0040] The coating device is used to apply double-sided coating protection to the stainless steel sheet to be processed.

[0041] The blanking device is used to cut the coated stainless steel sheet to obtain a blank of the required shape and size.

[0042] Based on the same inventive concept, embodiments of the present invention also provide a method for producing a membrane plate for a liquefied natural gas membrane tank based on the above-described production system, comprising:

[0043] Place the film plate to be shaped onto the shaping punch;

[0044] Control the upper forming die to descend so that the forming die and the forming punch can close and press and shape the middle corrugations, the central flat plate and the connecting corrugated areas of the film plate to be shaped.

[0045] The upper forming die is controlled to continue descending so that the forming block and the forming punch close together to press and shape the flat area of ​​the film plate edge, thus obtaining the shaped film plate.

[0046] In an optional embodiment, the method provided by the present invention further includes:

[0047] Double-sided film coating is applied to the stainless steel raw materials to be processed.

[0048] The double-sided coated stainless steel sheet is cut into blanks of the required shape and size to obtain the blank of the film sheet;

[0049] The blank of the film sheet is placed on the edge clamping device of the drawing device. The upper drawing die is controlled to descend so that the edge clamping cavity and the edge clamping protrusion close the die to clamp the blank around the edges. As the upper drawing die continues to descend, the drawing die closes the edge clamping device, and the blank is drawn into the required shape of the film sheet to obtain the drawn film sheet.

[0050] The stretched film sheet is placed on the clamping punch of the trimming device. The upper trimming die is controlled to descend so that the clamping die and the clamping punch of the lower trimming die close together to clamp the film sheet to be trimmed. The upper trimming die is controlled to continue to descend. At this time, the clamping die remains in place, while the trimming ring continues to descend. When passing the clamping punch, the trimming ring uses the trimming kerf to cut off the excess waste around the film sheet, completing the trimming and obtaining the film sheet to be shaped.

[0051] The beneficial effects of the above-described technical solutions provided in the embodiments of the present invention include at least the following:

[0052] The liquefied natural gas membrane tank membrane plate production system provided in this invention is used for processing corrugated membrane plates. It includes a forming cavity for the membrane plate, consisting of a forming punch, a forming block, and a forming cavity. The distance between the surface of the mold core frame away from the upper mold base and the upper mold base is greater than the distance between the surface of the forming block away from the upper mold base and the upper mold base. During the forming process of the membrane plate using this production system, during the descent of the forming upper mold, the forming cavity, under the pressure of a nitrogen spring, closes with the forming punch to press and shape the middle corrugations, the central flat plate, and the connecting corrugated areas of the membrane plate to be shaped. As the upper forming die continues to descend, the die core frame slides relative to the upper forming die base, compressing the nitrogen spring and causing the forming block and forming punch to close and press the edge flat area of ​​the film plate to be formed. During the forming process, the middle corrugations and connecting corrugations of the film plate are formed first, and then the edge flat area is formed. This can compensate for the deformation of the edge flat area caused when forming the middle corrugations and connecting corrugations, thereby reducing the springback deformation of the film plate structure after forming, improving the forming accuracy, and better controlling the accuracy of the film plate within the required accuracy range.

[0053] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings.

[0054] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0055] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0056] Figure 1 This is a schematic diagram of the thin film plate structure of the square closed corrugated plate in an embodiment of the present invention;

[0057] Figure 2 This is a schematic diagram of the shaping device structure in an embodiment of the present invention;

[0058] Figure 3 This is a schematic diagram of the upper shaping mold structure in an embodiment of the present invention;

[0059] Figure 4 This is a cross-sectional view of the upper forming mold structure in an embodiment of the present invention;

[0060] Figure 5 This is a schematic diagram of the upper shaping mold base structure in an embodiment of the present invention;

[0061] Figure 6 This is a schematic diagram of the core frame structure in an embodiment of the present invention;

[0062] Figure 7 This is a schematic diagram of the lower forming mold structure in an embodiment of the present invention;

[0063] Figure 8 This is a schematic diagram of the overall structure of the drawing apparatus in an embodiment of the present invention;

[0064] Figure 9 This is a schematic diagram of the drawing die structure in an embodiment of the present invention;

[0065] Figure 10 This is a schematic diagram of the drawing die structure in an embodiment of the present invention;

[0066] Figure 11 This is a schematic diagram of the drawing punch structure in an embodiment of the present invention:

[0067] Figure 12 This is a schematic diagram of the pressing device structure in an embodiment of the present invention;

[0068] Figure 13 This is a schematic diagram of the drawing die holder structure in an embodiment of the present invention;

[0069] Figure 14 This is a schematic diagram of the trimming device structure in an embodiment of the present invention;

[0070] Figure 15 This is a schematic diagram of the trimming upper mold structure in an embodiment of the present invention;

[0071] Figure 16 This is a cross-sectional view of the trimming upper mold structure in an embodiment of the present invention;

[0072] Figure 17 This is a schematic diagram of the trimming upper mold base structure in an embodiment of the present invention;

[0073] Figure 18 This is a schematic diagram of the clamping die structure in an embodiment of the present invention;

[0074] Figure 19 This is a schematic diagram of the trimming lower mold structure in an embodiment of the present invention;

[0075] Figure 20 This is a schematic diagram of the composition of the liquefied natural gas membrane tank membrane plate production system in an embodiment of the present invention;

[0076] Figure 21 This is a schematic diagram of the production process of the membrane plate for liquefied natural gas membrane tanks in an embodiment of the present invention;

[0077] Figure 22 This is another schematic diagram of the production method of the membrane plate of the liquefied natural gas membrane tank in an embodiment of the present invention. Detailed Implementation

[0078] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0079] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not 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 invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0080] In the description of this invention, 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 a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0081] Reference Figure 1 As shown, the structure of a square enclosed corrugated plate for a liquefied natural gas membrane tank is illustrated. The plate is made of square stainless steel corrugated plate. The central corrugation 2 is set as a square-shaped corrugation, which encloses a central flat plate area 12. Vertical connecting corrugations 3 and horizontal connecting corrugations 4 are provided in the middle of each side of the square shape. The vertical connecting corrugations 3 intersect the upper and lower sides of the central corrugations 2 in a T-shape, and the horizontal connecting corrugations 4 intersect the left and right sides of the central corrugations 2 in a T-shape. All intersecting areas form a transition zone 5. The cross-sectional shape of the corrugations is semi-circular, and the junction with the flat plate is smoothly transitioned by rounded corners 6.

[0082] To address the problem in existing technologies where the membrane plate structure of a closed corrugated plate is prone to springback deformation after shaping, resulting in low production precision, this invention provides a production system, method, and application for membrane plates in liquefied natural gas membrane tanks.

[0083] The liquefied natural gas membrane tank membrane plate production system provided in this embodiment of the invention is used for processing membrane plates with enclosed corrugated plate structures, as described in the following reference. Figures 1 to 7 As shown, it includes: a shaping device 11;

[0084] The shaping device 11 includes: an upper shaping mold 111 and a lower shaping mold 112;

[0085] The upper shaping mold 111 includes: an upper shaping mold base 1111, a mold core frame 1112, and multiple shaping blocks 1113;

[0086] The core frame 1112 is slidably disposed in the mounting cavity 1111 of the upper forming mold base 111, and a nitrogen spring 11112 is disposed between the mounting cavity 1111 and the core frame 1112; the core frame 1112 includes: a frame and a forming die 11121 disposed in the frame, the forming die 11121 includes: a forming cavity 111211 that matches the corrugations 2 in the middle of the film plate, the flat plate 12 in the middle and the connecting corrugations (3,4) area, specifically, the forming cavity 111211 is connected to the frame through the connecting corrugations (3,4);

[0087] The mounting cavity 11111 is provided with multiple mounting islands 11115 that are fixedly connected thereto, and the mold core frame 1112 is nested on the mounting islands 11115; the shape of the shaping block 113 matches the edge flat area 13 of the film plate and is correspondingly installed on the mounting island 11115;

[0088] The lower forming die 112 is provided with a forming punch 1121 that matches the structure of the film plate; the forming punch 1121, the forming block 1113 and the forming cavity 111211 together form the forming cavity of the film plate 1;

[0089] The distance between the surface of the mold core frame 1112 away from the upper forming mold base 1111 and the upper forming mold base 1111 is greater than the distance between the surface of the forming block 1113 away from the upper forming mold base 1111 and the upper forming mold base 1111. During the descent of the upper forming mold 111, the forming die 11121 closes with the forming punch 1121 under the pressure of the nitrogen spring 11112 to press and shape the central corrugations 2, the central flat plate 12 and the connecting corrugations (3,4) area of ​​the film plate to be shaped. As the upper forming mold 111 continues to descend, the mold core frame 1112 slides relative to the upper forming mold base 1111, squeezing the nitrogen spring 11112. The forming block 1113 closes with the forming punch 1121 to press and shape the edge flat plate area 13 of the film plate to be shaped.

[0090] The embodiments of the present invention do not specifically limit the specific implementation of the mold core frame being able to slide relative to the upper mold base, and can be selected according to actual needs; in one embodiment, refer to Figure 4 and Figure 6As shown, the upper forming mold base also includes at least one pull rod 11113; wherein, one end of the pull rod 11113 is fixedly connected to the upper forming mold base 1111;

[0091] Accordingly, the shaping cavity 111211 is provided with at least one pull rod hole 11122. The pull rod hole 11122 is a stepped hole, and the other end of the pull rod 11113 extends into the pull rod hole 11122 and can slide relative to the pull rod hole 11122. The other end of the pull rod 11113 is provided with a limiting boss to cooperate with the stepped surface of the pull rod hole 11122 to axially limit the pull rod 11113. Specifically, in the structural design of the pull rod 11113 and the pull rod hole 11122, it is necessary to ensure that when the shaping block and the shaping punch are closed, the lower end of the pull rod 11113 is still in the pull rod hole 11122 to avoid the pull rod 11113 penetrating the pull rod hole 11122 and damaging the film plate during the shaping process.

[0092] In one embodiment, the system provided by the present invention refers to... Figures 3 to 7 As shown, the upper shaping mold 111 further includes: a first guide structure 1114; the first guide structure 1114 is disposed on both sides of the upper shaping mold base 1111, as shown in the figure. Figure 5 As shown, it is provided with a plurality of first self-lubricating guide plates 11141 and a plurality of first guide blocks 11142;

[0093] Accordingly, the lower forming die also includes: a second guide structure 1122 disposed on both sides of the lower forming die 112, as shown in the figure. Figure 7 As shown, the second guide 1122 structure is provided with a plurality of second self-lubricating guide plates 11221 and a plurality of second guide blocks 11222, so that the second self-lubricating guide blocks 11221 cooperate with the corresponding first guide blocks 11142, and the second guide blocks 11221 cooperate with the corresponding first self-lubricating guide plates 11141 to form a moving guide between the upper forming die 111 and the lower forming die 112. The guide structure can provide precise guidance for the downward movement of the upper forming die 111, thereby reducing processing errors and improving processing accuracy.

[0094] In an optional embodiment, refer to Figure 7 As shown, the upper surface of the second guide structure 1122 is provided with a plurality of limit blocks 11223 and a plurality of nitrogen springs 11224 to control the descent stroke of the upper forming mold 111, thereby ensuring the stability and reliability of the forming process, reducing the possibility of excessive deformation of the film plate, and further improving the processing accuracy.

[0095] Specifically, in one embodiment, the structure of the shaping device of the present invention will be described in detail below: Refer to Figure 2As shown, the shaping device 11 includes an upper shaping mold 111 and a lower shaping mold 112.

[0096] Reference Figure 3 As shown, the upper shaping mold 111 is composed of an upper shaping mold base 1111, a mold core frame 1112, a shaping block 1113, and a first guide structure 1114.

[0097] Reference Figure 4 , Figure 5 , Figure 6 As shown, the shaping upper mold base 1111 has a square mounting cavity 11111 in the middle. A nitrogen spring 11112 and a pull rod 11113 are installed on the top plate of the mounting cavity 11111. Guide blocks 11114 are installed on the four side walls of the mounting cavity 11111. Multiple mounting islands 11115 are provided on the top plate of the mounting cavity 11111. The shaping block 1113 is installed on the mounting island 11115. The shape of the shaping block 1113 matches the edge flat plate area 13 of the film plate 1. The mold core frame 1112 is nested on the mounting island 11115 and installed in the mounting cavity 11111. The distance between the surface of the mold core frame 1112 away from the shaping upper mold base 1111 and the shaping upper mold base 1111 is greater than the distance between the surface of the shaping block 1113 away from the shaping upper mold base 1111 and the shaping upper mold base 1111, i.e., refer to Figure 3 As shown, with the upper forming die positioned as described, the core frame 1112 is higher than the forming block 1113 by a certain distance. The core frame 1112 is a square frame structure, and a forming die 11121 is provided in the middle of the core frame 1112. The forming die 11121 has a forming cavity 111211 that matches the corrugations 2, the flat plate 12, and the connecting corrugations (3,4) area in the middle of the film plate 1. The forming die 11121 has a tie rod hole 11122, and the tie rod 11113 passes through the tie rod hole 11122. The core frame 1112 is connected by the tie rod 11112. 13 slides up and down in the mounting cavity 11111. The nitrogen spring 11112 acts on the upper surface of the forming die 11121 to provide clamping force for pressing the film plate 1 to be formed. The core frame 1112 is provided with self-lubricating guide plates 11123 around its perimeter. The self-lubricating guide plates 11123 and guide blocks 11114 cooperate to form a guide between the upper die base 1111 and the core frame 1112. The first guide structure 1114 is provided on both sides of the upper die base 1111. The first guide structure 1114 is provided with a first self-lubricating guide plate 11141 and a first guide block 11142.

[0098] Reference Figure 7As shown, the lower forming die 112 has a forming punch 1121 in the middle and second guide structures 1122 on both sides. The forming punch 1121 has forming protrusions 11211 that match the film plate 1. The forming punch 1121, forming block 1113, and forming die 11121 together form the forming cavity of the film plate 1. The second guide structure 1122 has a second self-lubricating guide plate 11221 and a second guide block 11222. The second self-lubricating guide plate 11221 cooperates with the first guide block 11142, and the second guide block 11222 cooperates with the first self-lubricating guide plate 11141. The two sets of cooperation form a guide between the upper forming die 111 and the lower forming die 112. The upper surface of the second guide structure 1122 is provided with a limiting block 11223 and a nitrogen spring 11224. The limiting block 11223 and the nitrogen spring 11224 can effectively control the downward stroke of the upper forming mold 111, thereby ensuring the stability and reliability of the forming process and preventing excessive deformation.

[0099] In one embodiment, refer to Figures 8-13 As shown, the production system provided in this embodiment of the invention further includes: a drawing device 9; for drawing the blank of the film plate;

[0100] The drawing apparatus 9 includes: an upper drawing die 91 and a lower drawing die 92;

[0101] The drawing die 91 includes: a drawing die 911; the drawing die 911 includes: a drawing cavity 911 and a locking cavity 9112 disposed outside the drawing cavity 911;

[0102] The drawing die 92 includes: a drawing die holder 923 and a drawing punch 921 disposed on the drawing die holder 923;

[0103] The drawing punch 921 includes: a drawing protrusion 9212 and a locking protrusion 9212 disposed outside the drawing protrusion 9212;

[0104] The drawing protrusion 9212 and the drawing cavity 9111 are matched with the film plate. The drawing cavity 9111, the drawing protrusion 9212, the locking cavity 9112, and the locking protrusion 9212 together form the drawing forming cavity of the film plate. The locking cavity 9112 and the locking protrusion 9212 are used to press the edge of the blank to be drawn during the drawing process. By setting the locking cavity 9112 and the locking protrusion 9212 to press the edge of the film plate to be drawn during the drawing process, the metal flow during the drawing forming process can be effectively controlled, the tension in the edge plate 13 area of ​​the film plate 1 can be increased, thereby reducing the warpage of the edge plate area 13 and improving the forming quality.

[0105] In one embodiment, refer to Figure 9As shown, the drawing die 91 further includes a third guide structure 912, which is disposed on both sides of the drawing die 91.

[0106] Reference Figure 12 and Figure 13 As shown, the lower drawing die 92 further includes: a blank holder 922, which is sleeved on the outside of the drawing punch 921. A push rod 9221 is provided below the blank holder 922. A push rod through hole 9232 is provided on the lower drawing die base 923. The lower end of the push rod 9221 passes through the push rod through hole 9232 for contacting the ejection mechanism of the stamping equipment.

[0107] The pressing device 922 is provided with a fourth guide structure 9222 on both sides, and the drawing lower die base 923 is provided with a fifth guide structure 9231 on the top; the fourth guide structure 9222 is used to cooperate with the third guide structure 9112 to form a guide between the pressing device 922 and the drawing upper die 91, and to cooperate with the fifth guide structure 9231 to form a guide between the pressing device 922 and the drawing lower die base 923;

[0108] Furthermore, the upper surface of the pressing device 922 is provided with a plurality of limiting blocks 9223 and a plurality of positioning blocks 9224; the positioning blocks 9224 are used to position the blank to be drawn, and the limiting blocks 9223 are used to control the descent stroke of the upper drawing die 91.

[0109] In one embodiment, the structure of the shaping device of the present invention will be described in detail below: (Refer to...) Figure 8 As shown, the drawing device 9 includes an upper drawing die 91 and a lower drawing die 92.

[0110] Reference Figure 9 As shown, the upper drawing die 91 is provided with a drawing die 911 and a third guide structure 912. The drawing die 911 is located in the middle part of the upper drawing die 91. The drawing die 911 has a drawing cavity 9111 that matches the film plate 1 and a locking cavity 9112. The third guide structure 912 is provided on both sides of the upper drawing die 91. A self-lubricating guide plate 9121 and a guide block 9122 are provided on the third guide structure 912.

[0111] Reference Figure 10 As shown, the lower drawing die 92 includes: a drawing punch 921, a pressing device 922, and a lower drawing die holder 923.

[0112] Reference Figure 11As shown, the drawing punch 921 is installed in the middle of the drawing lower die holder 923. The drawing punch 921 is provided with a drawing protrusion 9211 and a locking protrusion 9212 that match the film plate 1. The drawing cavity 9111, the locking cavity 9112, the drawing protrusion 9211, and the locking protrusion 9212 together form the drawing forming cavity of the film plate 1. The locking cavity 9112 and the locking protrusion 9212 can effectively control the metal flow during the drawing forming process, increase the tension in the flat area of ​​the film plate 1, thereby reducing the warping of the flat area and improving the forming quality.

[0113] Reference Figure 10 , Figure 12 , Figure 13 As shown, the blank holder 922 is fitted outside the drawing punch 921. A push rod 9221 is provided below the blank holder 922. A fourth guide structure 9222 is provided on both sides of the blank holder 922. A self-lubricating guide plate 92221 is provided on the outer side of the fourth guide structure 9222, and a guide block 92222 and a self-lubricating guide plate 92223 are provided on the inner side. The guide block 92222 and the self-lubricating guide plate 92223 cooperate with the self-lubricating guide plate 9121 and the guide block 9122 on the drawing upper die 91 to form a guide between the blank holder 922 and the drawing upper die 91. A limiting block 9223 is provided on the upper surface of the blank holder 922. The limiting block 9223 can effectively control the downward stroke of the drawing upper die 91, thereby ensuring that the blank holder will not be excessively deformed. A positioning block 9224 is provided on the upper surface of the blank holder 922 for positioning the blank.

[0114] Reference Figure 13 As shown, the lower drawing die base 923 has a fifth guide structure 9231 at each of its four corners. Guide blocks 92311 are provided on the surface of the guide structure 9231. The guide blocks 92311 cooperate with the self-lubricating guide plate 92221 on the blank holder 922 to form a guide between the blank holder 922 and the lower drawing die base 923. The lower drawing die base 923 has a push rod through hole 9232. The push rod 9221 on the blank holder 922 passes through the push rod through hole 9232 and is ejected by the stamping equipment. In the mechanism contact, the guide block 92311 of the fifth guide structure 9231 cooperates with the self-lubricating guide plate 92221 of the pressing device, which can guide the movement of the pressing device 922 when it is ejected under the action of the ejection mechanism; the upper surface of the drawing lower die base 923 is provided with a limiting block 9233, which can effectively control the descent stroke of the drawing upper die 91 and the pressing device 922, thereby ensuring the stability and reliability of the drawing process and preventing excessive deformation.

[0115] In an optional embodiment, the production system provided by the present invention refers to... Figures 14 to 19 As shown, it also includes: a trimming device 10 for trimming the film sheet after the stretching process;

[0116] The trimming device includes: an upper trimming die 101 and a lower trimming die 102;

[0117] The trimming upper mold 101 includes: a trimming upper mold base 1011, a clamping die 1012, and a trimming ring 1013;

[0118] The trimming die 102 includes: a clamping punch 1021 disposed in the middle;

[0119] The pressing punch 1021 includes: a pressing protrusion 10211 that matches the structure of the film plate, and a cutting edge 10212 provided around the periphery of the pressing protrusion 10211;

[0120] The clamping die 1012 is slidably disposed within the mounting cavity 10111 of the trimming upper die base 1011, and it is provided with a clamping cavity 10122 that matches the structure of the film plate. The trimming ring 1013 is mounted on the trimming upper die base 1011 and sleeved on the outside of the clamping die 1012. The distance between the surface of the clamping die 1012 away from the trimming upper die base 1011 and the trimming upper die base 1011 is greater than the distance between the surface of the trimming ring 1013 away from the trimming upper die base 1011 and the trimming upper die base 1011, so that during the downward movement of the trimming upper die 101, the clamping die 1012 and the clamping punch 1021 first close the mold to clamp the film plate to be trimmed; as the trimming upper die 1011 continues to move downward, the film plate to be trimmed is sheared by the cooperation of the trimming notch 10221 and the trimming ring 1013.

[0121] Furthermore, a sixth guide structure 1014 is provided on both sides of the trimming upper mold base;

[0122] The sixth guide structure is provided with a guide sleeve 10141, a third guide block 10143, and a third self-lubricating guide plate 10142;

[0123] Correspondingly, a seventh guide structure is provided on both sides of the trimming lower die; the seventh guide structure 1022 is provided with a guide post 10221, a fourth guide block 10222, and a fourth self-lubricating guide plate 10223, so that the guide post 10221 cooperates with the guide sleeve 10141 to form a vertical guide between the trimming upper die and the trimming lower die; the third guide block 10143 and the fourth self-lubricating guide plate 10223 cooperate, and the third self-lubricating guide plate 10142 and the fourth guide block 10222 cooperate to form a horizontal guide between the trimming upper die 101 and the trimming lower die 102.

[0124] In one embodiment, the structure of the shaping device of the present invention will be described in detail below: (Refer to...) Figure 14 As shown, the trimming device 10 includes an upper trimming mold 101 and a lower trimming mold 102.

[0125] Reference Figure 15 As shown, the trimming upper mold 101 consists of a trimming upper mold base 1011, a clamping die 1012, a trimming ring 1013, and a sixth guide structure 1014.

[0126] Reference Figure 16 , Figure 17 , Figure 18 As shown, the trimming upper mold base 1011 has a square mounting cavity 10111 in the middle. A nitrogen spring 10112 and a pull rod 10113 are mounted on the top plate of the mounting cavity 10111. Guide blocks 10114 are mounted on the four side walls of the mounting cavity 10111. The clamping die 1012 is installed in the mounting cavity 10111. The clamping die 1012 has a pull rod hole 10121. The pull rod 10113 passes through the pull rod hole 10121. The clamping die 1012 slides up and down in the mounting cavity 10111 through the pull rod 10113. The nitrogen spring 10112 acts on the upper surface of the clamping die 1012 to provide clamping force for clamping the film plate to be trimmed. The clamping die 1012 is provided with a clamping cavity 10122 that matches the film plate 1. The clamping die 1012 is provided with a self-lubricating guide plate 10123 around its perimeter. The self-lubricating guide plate 10123 and the guide block 10114 cooperate to form a guide between the upper die base 1011 and the clamping die 1012. The trimming ring 1013 is installed on the clamping die 1012 at the opening of the mounting cavity 10111. The clamping die 1012 is higher than the trimming ring 1013 by a certain distance. The sixth guide structure 1014 is provided on both sides of the upper die base 1011. The sixth guide structure 1014 is equipped with a guide sleeve 10141, a third self-lubricating guide plate 10142, and a third guide block 10143.

[0127] Reference Figure 19As shown, the trimming die 102 has a clamping punch 1021 in the middle and a seventh guide structure 1022 on both sides. The clamping punch 1021 has clamping protrusions 10211 that match the film plate 1. At the same time, the clamping punch 1021 has cutting edges 10212 around its perimeter. The cutting edges 10212 cooperate with the cutting ring 1013 to cut the film plate 1 to be trimmed. The seventh guide structure 1022 is equipped with a guide post 10221, a fourth guide block 10222, and a fourth self-lubricating guide plate 10223. The guide post 10221 cooperates with the guide sleeve 10141 to form a vertical guide between the upper trimming die 101 and the lower trimming die 102. The fourth guide block 10222 cooperates with the third self-lubricating guide plate 10142, and the fourth self-lubricating guide plate 10223 cooperates with the third guide block 10143 to form a horizontal guide between the upper trimming die 101 and the lower trimming die 102. The seventh guide structure 1022 is equipped with a limiting block 10224 and a nitrogen spring 10225. The limiting block 10224 and the nitrogen spring 10225 can effectively control the downward stroke of the upper trimming die 101, thereby ensuring that the trimming process does not descend excessively.

[0128] In one embodiment, the production system provided by this invention refers to... Figure 20 As shown, it also includes: a film coating device 6 and a material unloading device 7;

[0129] The coating device 6 is used to coat the stainless steel plate to be processed with a double-sided film to protect the surface of the plate from damage during the processing.

[0130] The blanking device 7 is used to cut the coated stainless steel sheet to obtain a blank of the required shape and size.

[0131] Optionally, the coating device 6 is an existing coating equipment used to double-sidedly coat and protect the stainless steel sheet to be processed; the blanking device 7 is an existing shearing machine or punching die used to cut the film blank.

[0132] Optionally, in one embodiment, reference is made to... Figure 20 As shown, the liquefied natural gas membrane tank membrane plate production system provided in this embodiment of the invention includes: a coating device 7, a blanking device 8, a drawing device 9, an edge trimming device 10, and a shaping device 11, with each device arranged sequentially according to the production process; the coating device 7, the blanking device 8, the drawing device 9, the edge trimming device 10, and the shaping device 11 are the devices described in the above embodiment.

[0133] Based on the same inventive concept, this invention also provides a method for producing the membrane plate of the above-mentioned liquefied natural gas membrane tank membrane plate, which mainly includes a shaping step, the flowchart of which is shown below. Figure 21 As shown, it includes the following steps:

[0134] Step S101: Place the film plate to be shaped onto the shaping punch;

[0135] Step S102: Control the upper forming die to descend so that the forming die and the forming punch close together to press and shape the middle corrugations, the middle flat plate and the connecting corrugated areas of the film plate to be shaped.

[0136] Step S103: Control the upper forming die to continue descending so that the forming block and the forming punch close together to press and shape the flat area of ​​the film plate edge, so as to obtain the film plate after shaping.

[0137] Shaping the film sheet can effectively improve defects such as warping formed during the drawing process. The production method provided in this invention involves the following steps during the shaping process: First, the shaping die and shaping punch close together to press and shape the central corrugations, the central flat plate, and the connecting corrugated areas. Then, as the shaping die continues to descend, the shaping block and shaping punch close together to press and shape the edge flat plate areas of the film sheet. This method can compensate for the deformation caused to the edge flat plate areas during the shaping of the central corrugations and connecting corrugations, thereby reducing the springback deformation of the film sheet structure after shaping, improving the shaping accuracy, and better controlling the accuracy of the film sheet within the required range.

[0138] In one embodiment, the production method provided by this invention further includes the following steps before the shaping step: film coating, blanking, drawing, and trimming. In this embodiment, the flowchart provided by this invention is shown below. Figure 22 As shown, it includes the following steps:

[0139] Step S201: Coating: Coat both sides of the stainless steel raw material to be processed with film;

[0140] Step S202: Blanking: Cut the double-sided coated stainless steel sheet into blanks of the required shape and size to obtain the blank of the film plate;

[0141] Step S203: Drawing: Place the blank of the film sheet on the edge clamping device of the drawing apparatus, control the upper drawing die to descend so that the edge clamping cavity and the edge clamping protrusion close the die to clamp the blank around the perimeter. As the upper drawing die continues to descend, the drawing die closes the edge clamping device to draw the blank into the required shape of the film sheet to obtain the drawn film sheet.

[0142] Step S204: Trimming: Place the stretched film sheet on the clamping punch of the trimming device, control the upper trimming die to descend so that the clamping die and the clamping punch of the lower trimming die close together to clamp the film sheet to be trimmed, control the upper trimming die to continue descending, at this time the clamping die position remains unchanged, while the trimming ring continues to descend. When passing the clamping punch, the trimming ring uses the trimming kerf to cut off the excess waste around the film sheet, completing the trimming, so as to obtain the film sheet to be shaped;

[0143] Step S205: Shaping: Place the film plate to be shaped on the shaping punch; control the upper shaping die to descend so that the shaping die and the shaping punch close together to press and shape the middle corrugations, the central flat plate and the connecting corrugated areas of the film plate to be shaped; control the upper shaping die to continue to descend so that the shaping block and the shaping punch close together to press and shape the flat plate area at the edge of the film plate to obtain the shaped film plate.

[0144] Specifically, during the drawing process, the ejector mechanism of the stamping equipment first ejects and raises the blank holder 922 a certain distance. Then, the blank of the film sheet is placed on the blank holder 922, and the positioning block 9224 provides positioning to limit the blank within the required range. Next, the drawing die 911 descends with the upper drawing die 91 and closes with the blank holder 922 to press the blank tightly around its perimeter. Pressing the blank tightly around its perimeter in advance can effectively control the metal flow during drawing and prevent the edges from becoming unstable and wrinkling. Then, the drawing die... The die 911 and the blank holder 922 continue to descend simultaneously until the drawing die 911 and the drawing punch 921 close, drawing the blank into the required shape of the film sheet 1, completing the drawing process. Then, the blank holder 922 rises, ejecting the drawn film sheet from the drawing punch 921 for demolding. Throughout the process, the guiding structure provides precise guidance for the die closing. The drawing process essentially completes the required shape of the film sheet 1, except for some excess material around the edges and warping defects in some areas. Furthermore, during the trimming and shaping processes, the guiding structures of the trimming and shaping devices also provide precise guidance for the die closing.

[0145] In an optional embodiment, the film plate production method provided by the present invention, including the coating, blanking, drawing, and trimming processes, is based on the coating device, blanking device, drawing device, and trimming device in the film plate production system described above. The specific usage of each device in the production system has been described in detail in the embodiments of the relevant system described above, and will not be elaborated upon here.

[0146] Based on the same inventive concept, embodiments of the present invention also provide an LNG film plate production system in the field of cryogenic insulation storage technology.

[0147] The present invention provides a production system and method for liquefied natural gas membrane tank sheets. In this system, a drawing device includes an upper drawing die and a lower drawing die. The upper drawing die has a drawing die and a guiding structure. The lower drawing die has a drawing punch, a pressing device, and a guiding structure. The pressing device is mounted on the drawing punch. The four corners of the drawing punch have guiding structures that cooperate with the pressing device. The pressing device has a guiding structure that cooperates with the upper drawing die and a positioning block for the sheet material. The drawing punch and the drawing die together form a drawing forming cavity for the membrane sheet. The trimming device includes an upper trimming die and a lower trimming die. The upper trimming die consists of an upper trimming die base, a clamping die, a trimming ring, and a guide structure. The clamping die is installed in the mounting cavity of the upper trimming die base. The trimming ring is fitted around the clamping die and installed on the upper die base. The clamping die is higher than the trimming ring. The guide structure is located on both sides of the upper die base. The lower trimming die consists of a clamping punch and a guide structure. The clamping punch has a trimming notch around its perimeter, which cooperates with the trimming ring to form a shearing action. The forming device includes an upper forming die and a lower forming die. The upper forming die consists of a forming die base, a die core frame, a forming block, and a guide structure. The upper forming die base has a mounting cavity in the middle, and a mounting island is located within the mounting cavity. The forming block is mounted on the mounting island. The die core frame is nested within the mounting cavity of the upper forming die base. The die core frame consists of a frame and a forming die cavity. Guide structures are provided around the frame to cooperate with the guide structures within the mounting cavity. The forming die cavity is higher than the forming block. The lower forming die consists of a forming punch and a guide structure. The forming die cavity, forming block, and forming punch together form a forming cavity. The guide structures on both sides of the lower forming die cooperate with the guide structures on both sides of the upper forming die base. This embodiment uses an integral forming process for the waveform shape of the film sheet. Only three key processes—drawing, trimming, and forming—are required to complete the film sheet processing, resulting in high production efficiency, fewer processes, and smaller cumulative processing errors. Furthermore, the precise guidance assistance of each device further reduces cumulative processing errors, resulting in high precision and high quality film sheets after forming.

[0148] It should be understood that the specific order or hierarchy of steps in the disclosed process is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process may be rearranged without departing from the scope of this disclosure. The appended method claims provide elements of various steps in an exemplary order and are not intended to limit the scope to the specific order or hierarchy described.

[0149] In the detailed description above, various features are combined together in a single embodiment to simplify this disclosure. This approach to disclosure should not be construed as reflecting an intention that embodiments of the claimed subject matter require more features than are explicitly stated in each claim. Rather, as reflected in the appended claims, the invention is presented with fewer features than all of the features in a single disclosed embodiment. Therefore, the appended claims are hereby explicitly incorporated into the detailed description, with each claim representing a separate preferred embodiment of the invention.

[0150] The foregoing description includes examples of one or more embodiments. It is certainly impossible to describe all possible combinations of components or methods in order to describe the above embodiments, but those skilled in the art will recognize that further combinations and arrangements of the various embodiments are possible. Therefore, the embodiments described herein are intended to cover all such changes, modifications, and variations that fall within the scope of the appended claims. Furthermore, the term "comprising" as used in the specification or claims is interpreted in a manner similar to the term "including," as interpreted when used as a conjunction in the claims. Additionally, the use of any term "or" in the specification of the claims is intended to mean "non-exclusive or."

Claims

1. A production system for membrane panels of liquefied natural gas membrane tanks, characterized in that, Thin film sheet processing for closed corrugated plate structures includes: shaping equipment; The shaping device includes: an upper shaping mold and a lower shaping mold; The upper shaping mold includes: an upper shaping mold base, a mold core frame, and multiple shaping blocks; The core frame is slidably disposed in the mounting cavity of the upper forming mold base, and a nitrogen spring is provided between the mounting cavity and the core frame; the core frame includes: a frame and a forming die disposed in the frame, the forming die including: a forming cavity that matches the corrugations in the middle of the film plate, the flat plate in the middle and the connecting corrugated area; The mounting cavity is provided with multiple mounting islands fixedly connected thereto, and the mold core frame is nested on the mounting islands; the shape of the shaping block matches the edge flat area of ​​the film plate and is correspondingly mounted on the mounting island; The lower forming die is provided with a forming punch that matches the structure of the film plate; the forming punch, the forming block, and the forming cavity together form the forming cavity of the film plate; The distance between the surface of the mold core frame away from the upper forming mold base and the upper forming mold base is greater than the distance between the surface of the forming block away from the upper forming mold base and the upper forming mold base. During the descent of the upper forming mold, the forming die, under the pressure of the nitrogen spring, closes with the forming punch to press and shape the middle corrugations, the central flat plate, and the connecting corrugated areas of the film plate to be formed. As the upper forming mold continues to descend, the mold core frame slides relative to the upper forming mold base, squeezing the nitrogen spring. The forming block and the forming punch close together to press and shape the edge flat plate area of ​​the film plate to be formed.

2. The system as described in claim 1, characterized in that, The upper forming mold also includes at least one connecting rod; One end of the pull rod is fixedly connected to the upper shaping mold base; Accordingly, the shaping cavity is provided with at least one pull rod hole, which is a stepped hole. The other end of the pull rod extends into the pull rod hole and can slide relative to the pull rod hole. The other end of the pull rod is provided with a limiting boss to cooperate with the stepped surface of the pull rod hole to axially limit the pull rod.

3. The system as described in claim 1, characterized in that, The upper shaping mold further includes: a first guide structure; The first guide structure is disposed on both sides of the upper forming mold base, and is provided with a plurality of first self-lubricating guide plates and a plurality of first guide blocks; Accordingly, the lower forming die also includes: a second guide structure disposed on both sides of the lower forming die, wherein the second guide structure is provided with a plurality of second self-lubricating guide plates and a plurality of second guide blocks; so that the second self-lubricating guide blocks cooperate with the corresponding first guide blocks, and the second guide blocks cooperate with their corresponding first self-lubricating guide plates to form a moving guide between the upper forming die and the lower forming die.

4. The system as described in claim 3, characterized in that, The upper surface of the second guide structure is provided with multiple limit blocks and multiple nitrogen springs to control the descent stroke of the upper forming mold.

5. The system as described in claim 1, characterized in that, Also includes: A drawing apparatus for drawing blanks of film sheets; The drawing apparatus includes: an upper drawing die and a lower drawing die; The drawing die includes a drawing die; the drawing die includes a drawing cavity and a locking cavity disposed outside the drawing cavity; The drawing die includes: a drawing die holder and a drawing punch disposed on the drawing die holder; The drawing die includes: a drawing protrusion and a locking protrusion disposed outside the drawing protrusion; The drawing protrusion and the drawing cavity are matched with the film sheet to be drawn. The drawing cavity, the drawing protrusion, the locking cavity and the locking protrusion together form the drawing forming cavity of the film sheet. The locking cavity and the locking protrusion are used to press the edge of the blank to be drawn during the drawing process.

6. The system as described in claim 5, characterized in that, The drawing die has a third guide structure on both sides; The lower drawing die further includes: a blank holder, which is sleeved on the outside of the drawing punch. A push rod is provided below the blank holder, and a push rod through hole is provided on the lower drawing die base. The lower end of the push rod passes through the push rod through hole to contact the ejection mechanism of the stamping equipment. The pressing device is provided with a fourth guide structure on both sides, and the drawing lower die base is provided with a fifth guide structure on the top; the fourth guide structure is used to cooperate with the third guide structure to form a guide between the pressing device and the drawing upper die, and to cooperate with the fifth guide structure to form a guide between the pressing device and the drawing lower die base. Furthermore, the upper surface of the pressing device is provided with multiple limiting blocks and multiple positioning blocks; the positioning blocks are used to position the blank to be drawn, and the limiting blocks are used to control the downward stroke of the upper drawing die.

7. The system as described in claim 1, characterized in that, Also includes: Trimming device for trimming the edges of drawn film sheets; The trimming device includes: an upper trimming die and a lower trimming die; The trimming upper mold includes: a trimming upper mold base, a clamping die, and a trimming ring; The trimming die includes: a clamping punch located in the middle; The clamping punch includes: a clamping protrusion that matches the structure of the film plate, and a slit cut provided around the periphery of the clamping protrusion; The clamping die is slidably disposed within the mounting cavity of the trimming upper die base, and it is provided with a clamping cavity that matches the structure of the film plate. The trimming ring is mounted on the upper die base and sleeved on the outside of the clamping die. The distance between the surface of the clamping die away from the trimming upper die base and the trimming upper die base is greater than the distance between the surface of the trimming ring away from the trimming upper die base and the trimming upper die base, so that during the downward movement of the trimming upper die, the clamping die and the clamping punch first close the die to clamp the film plate to be trimmed; as the trimming upper die continues to move downward, the film plate to be trimmed is sheared by the cooperation of the trimming ferrule and the trimming ring.

8. The system as described in claim 7, characterized in that, The trimming upper mold base is provided with a sixth guide structure on both sides; The sixth guide structure is provided with a guide sleeve, a third guide block, and a third self-lubricating guide plate; Accordingly, a seventh guide structure is provided on both sides of the trimming lower die; the seventh guide structure is provided with a guide post, a fourth guide block, and a fourth self-lubricating guide plate, so as to form a vertical guide between the trimming upper die and the trimming lower die through the cooperation of the guide post and the guide sleeve; and to form a horizontal guide between the trimming upper die and the trimming lower die through the cooperation of the third guide block and the fourth self-lubricating guide plate, and the cooperation of the third self-lubricating guide plate and the fourth guide block.

9. The system as described in any one of claims 1-8, characterized in that, Also includes: Film coating device and material unloading device; The coating device is used to apply double-sided coating protection to the stainless steel sheet to be processed. The blanking device is used to cut the coated stainless steel sheet to obtain a blank of the required shape and size.

10. A method for producing a membrane plate for a liquefied natural gas membrane tank, characterized in that, The system is implemented based on the production system for the membrane plate of the liquefied natural gas membrane tank as described in any one of claims 1-9, including: Place the film plate to be shaped onto the shaping punch; Control the upper forming die to descend so that the forming die and the forming punch can close and press and shape the middle corrugations, the middle flat plate and the connecting corrugated areas of the film plate to be shaped. The upper forming die is controlled to continue descending so that the forming block and the forming punch close together to press and shape the flat area of ​​the film plate edge, thus obtaining the shaped film plate.

11. The method as described in claim 9, characterized in that, Also includes: Double-sided film coating is applied to the stainless steel raw materials to be processed. The double-sided coated stainless steel sheet is cut into blanks of the required shape and size to obtain the blank of the film sheet; The blank of the film sheet is placed on the edge clamping device of the drawing device. The upper drawing die is controlled to descend so that the edge clamping cavity and the edge clamping protrusion close the die to clamp the blank around the edges. As the upper drawing die continues to descend, the drawing die closes the edge clamping device, and the blank is drawn into the required shape of the film sheet to obtain the drawn film sheet. The stretched film sheet is placed on the clamping punch of the trimming device. The upper trimming die is controlled to descend so that the clamping die and the clamping punch of the lower trimming die close together to clamp the film sheet to be trimmed. The upper trimming die is controlled to continue to descend. At this time, the clamping die remains in place, while the trimming ring continues to descend. When passing the clamping punch, the trimming ring uses the trimming kerf to cut off the excess waste around the film sheet, completing the trimming and obtaining the film sheet to be shaped.

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