A rope-restrained thin-film sunshade folding tool and folding method

Abstract

The application discloses a kind of rope restraint thin film sunshade folding tool and folding method, folding tool includes: auxiliary folding tool, the outer surface of the auxiliary tool is provided with crease;Elastic rope, for the fitting state of thin film and the outer surface of auxiliary folding tool and the setting of folded thin film;Thin film fitting roller device, for the fitting of auxiliary thin film and folding tool panel outer surface;Fixed clamp plate, for the connection of thin film upper end and lifting appliance and the connection of thin film lower end and auxiliary folding tool and the fixing of final thin film folding state;Clamp, for the setting of folded part thin film;Membrane support plate device, for placing the thin film after folding and adjusting the position of thin film;Vertical support device, for fixed support folding auxiliary tool and the movement of auxiliary folding auxiliary tool.The application can be used to fold thin film sunshade structure from planar state into folding state based on paper folding configuration, with the advantages of simple operation, time saving and labor saving, reusable and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of thin film folding method tool, in particular to a kind of columnar thin film sunshade folding tool of rope constraint form. BACKGROUND

[0002] Deployable sunshade is one of the applications of space deployable structure, and is a new type of structure continuously developed with the demand of space field. For spacecraft, due to the limitation of launch volume and mass, the sunshade needs to be folded before launch and opened smoothly and effectively according to the designed fold after entering orbit. The three-dimensional axial deployment form of sunshade refers to the sunshade with the shape of cylindrical surface or oblique cylindrical surface, conical surface or oblique surface. At present, the size of the required sunshade structure is getting larger and larger, and the storage rate requirement is increasing.

[0003] On the other hand, in order to reduce transportation cost, the thin film is usually artificially pressed into fold and folded along the fold by using paper folding technology to reduce its storage volume. The flexible film structure itself is prone to damage during folding, and the fold is not easy to be prefabricated. Large size thin film structure will exacerbate the above problems, and the existing thin film folding tool consumes a lot of manpower and time when folding large size thin film structure, which has been unable to meet the demand. Therefore, the folding tool system of folded thin film structure is urgently needed.

[0004] In order to solve the folding problem of large size thin film structure, a set of rope constraint thin film folding tool scheme based on paper folding configuration is proposed, which has obvious advantages when folding large size thin film. SUMMARY

[0005] The purpose of the present application is to provide a kind of rope constraint thin film sunshade folding tool and folding method, cooperate with the auxiliary film fitting device and elastic rope, fold the thin film sunshade from plane state into the folding state based on paper folding configuration, solve the problems such as thin film not easy to control, disorder, stress concentration, thin film fold is not clear during folding process, the tool is simple to operate, and is convenient for processing production, can be reused.

[0006] The present application first provides a kind of rope constraint thin film sunshade folding tool, comprising:

[0007] auxiliary folding tool for assisting the folding of thin film;The outer surface of the auxiliary tool is provided with fold, and the fold includes mountain fold and valley fold;

[0008] elastic rope for the fitting state of thin film and the outer surface of auxiliary folding tool and the setting of folded thin film, fixed at both ends of auxiliary folding tool;

[0009] The film fitting roller device is used for assisting the film to fit the outer surface of the folding tool panel, and comprises a roller, which is used for pressing the film into valley fold to realize the film fitting the outer surface of the folding tool panel.

[0010] The fixed clamping plate is used for connecting the upper end of the film with the lifting tool, connecting the lower end of the film with the auxiliary folding tool, and fixing the folded film.

[0011] The clamp is used for fixing the folded film.

[0012] The film supporting bottom plate device is used for placing the folded film and adjusting the position of the film.

[0013] The vertical supporting device is used for fixing and moving the folding auxiliary tool.

[0014] The application also provides a folding method of the rope-restrained film sunshade folding tool, which comprises the following steps:

[0015] The upper end of the film is clamped and lifted by the lifting tool, and the lower end of the film is fixed on the supporting bottom plate by the fixed clamping plate.

[0016] When the film is folded, the lifting tool is operated to move the whole film downward, the film fitting roller device is operated to make the disc outer surface of the film fitting roller device fully fit the valley fold of the outer surface of the auxiliary folding tool, and the film fitting roller device is moved in a ring direction, so that the film fits the outer surface of the auxiliary folding tool; when the film fitting is completed, the elastic rope is tightened to make the whole film fit the surface of the folding auxiliary tool, and the folding of the current three-layer film folding unit is further completed.

[0017] The elastic rope is removed, and the film auxiliary folding tool is removed.

[0018] After the folded film is shaped, the whole film structure is moved downward, the film height moving value is calculated according to the number of the folded film, the lifting height is lowered, the restriction at the guide positioning pin hole is removed, the bottom plate is slid downward, the sliding length value is equal to the film height moving value, the folding tool rotating device is rotated outward, the film auxiliary folding tool is rotated outward to the position mark before the tool is removed, the film folding auxiliary tool is ensured to be restored to the original position, and finally the limiting device at the folding tool rotating device, the fixed bottom connecting plate and the fixed buckle are installed.

[0019] The above steps are used to realize the layer-by-layer folding of the film structure until all the film structures are folded; the last assembly process only needs to be performed to the steps of removing the elastic rope and the film auxiliary folding tool; after the layer-by-layer folding of the film is completed, the lifting tool is separated from the top of the film.

[0020] After the entire thin film structure is folded, the folded thin film is fixed in its current state.

[0021] The method for removing the elastic rope and the film-assisted folding fixture is as follows: After completing the film folding of the first three folding units, remove the elastic rope; further remove the bolts, remove the limiting device in the fixture's rotating device, open the buckles, and remove the bottom connecting plate to ensure the normal rotation of the hinges in subsequent operations; the limiting device is removed in the following order: first at the auxiliary fixture positions on both sides of the overall structure, then at the middle position; before rotating the fixture inward and removing it entirely inward, mark the position of the vertical support device to ensure that the fixture can be restored to its original position later; after removing the limiting device, rotate the fixture inward; after rotation, fold the film-assisted folding fixture entirely inward; during inward rotation, the folded film structure separates from the auxiliary folding fixture, at which point a clamp is used to fix and maintain the shape of the folded portion of the film.

[0022] The method for fixing the folded film is as follows: use the second clamping plate to press down the film as a whole, remove the bolt connection between the lower clamping plate of the film and the mold base plate, then remove the clamps used for temporary fixing, and finally use elastic rope to wrap and bind the upper and lower clamping plates of the film to fix the upper clamping plate, the lower clamping plate and the folded film in between.

[0023] Beneficial Effects: This invention comprises an auxiliary folding fixture, elastic ropes, and an auxiliary film bonding device, forming a rope-constrained film sunshade folding fixture system. This invention, combined with manual external force, achieves the goal of prefabricating sunshades with clearly defined creases, solving the problems of excessive flexibility, susceptibility to damage, and unclear creases. During the design phase, only the geometric parameters of the auxiliary folding fixture and the film bonding device need to be adjusted to prefabricate flexible film sunshades with different creases. During production, only a mold needs to be made according to the specified dimensions, and then folding is performed using the bonding device and elastic rope constraint. Operation is simple and quick; disassembly is performed sequentially without affecting the sunshade. When repeated folding is required, the folding fixture can be reused simply by reassembling it.

[0024] In summary, this invention has the advantages of simple structure, easy use, and reusability, and has broad development prospects in aviation, aerospace and other fields. Attached Figure Description

[0025] Figure 1 This is a spatial diagram of the present invention;

[0026] Figure 2 for Figure 1 Detailed drawings of Part A;

[0027] Figure 3 forFigure 1 Detailed drawings of Part B;

[0028] Figure 4 A schematic diagram of the inner surface space of the folding tooling is provided for reference.

[0029] Figure 5 A schematic diagram of the outer surface space of the folding tooling is provided for reference.

[0030] Figure 6 This is a schematic diagram of a film tray;

[0031] Figure 7 for Figure 6 C-section detailed diagram;

[0032] Figure 8 This is a schematic diagram of the vertical support device;

[0033] Figure 9 This is a schematic diagram of the base plate lifting device;

[0034] Figure 10 This is a schematic diagram illustrating the connection of the tooling hinges;

[0035] Figure 11 Diagram of hooves;

[0036] Figure 12 This is a schematic diagram of a film lamination device;

[0037] Figure 13 This is a schematic diagram of the folded intermediate state;

[0038] Figure 14 for Figure 13 Detailed drawing of Part D;

[0039] Figure 15 This is a schematic diagram of the film when folded;

[0040] Figure 16 This is a schematic diagram of the fixture structure;

[0041] Figure 17 This is a schematic diagram of the fixed clamping plate structure;

[0042] The components include: 1. Film support base plate device; 2. Folding fixture module; 3. Auxiliary fixture bottom inner connector; 4. Auxiliary fixture top inner connector; 5. Base plate; 6. Foot; 7. Casters; 8. Hinge; 9. Buckle; 10. Connecting plate; 11. Limiting device; 12. Lower fixing clamp; 13. Roller device; 14. Elastic rope hook; 15. Grain line crease; 16. Crease chamfer; 17. Lead screw; 18. Guide rail; 19. Guide rail base; 20. Bolt hole; 21. Guide rail connecting block; 22. Positioning pin hole; 23. Bolt; 24. Foot base; 25. Roller device handle; 26. Roller; 27. Folded film; 28. Unfolded film; 29. ​​Elastic rope; 30. Caster top connecting hole; 31. Clamp; 32. Pin; 33. Silicone pad; 34. Pressure plate; 35. Rivet. Detailed Implementation

[0043] The invention will now be further described with reference to the accompanying drawings.

[0044] This invention relates to a rope-constrained film sunshade folding fixture, the three-dimensional view of which is shown below. Figure 1 As shown, it consists of a folding auxiliary fixture, a film laminating device, an elastic rope, a fixing clamp, a film support base plate device, a vertical support device, and a fixture rotation device.

[0045] like Figure 4 As shown, the folding auxiliary fixture is composed of folding fixture modules 2 connected sequentially. Folding fixture module 2 is the main body of the pre-fabricated creases. Connecting folding fixture modules 2 are linked by buckles, hinges, and connecting plates to form the overall structure of the folding auxiliary fixture. The basic structure of the folding auxiliary fixture is based on origami. The side of the auxiliary fixture that contacts the film is defined as the outer surface, and the other side as the inner surface. The creases on the outer surface include mountain creases (raised creases) and valley creases (recessed creases). Chamfering is applied to the creases of the auxiliary fixture to protect the flexible film and reduce the difficulty of fixing the elastic cord. Folding fixture module 2 is divided into left and right units, with bolt holes 20 at the top, bottom, and middle. The bolt holes 20 at the top are used to connect the top inner connector 4, the bolt holes 20 at the bottom are used to connect the bottom inner connector 3, and the bolt holes 20 at the middle are used to connect the left and right units of the folding fixture module. Connecting buckles 9 are fixedly installed on the top inner connector 4, forming a connection and locking mechanism between the left and right units within the folding auxiliary fixture. Elastic rope hooks 14 are provided at both ends of the folding tooling module 2.

[0046] Vertical support device structure as follows Figure 8 As shown, the assembly includes a base plate 5 and casters 7. The base plate 5 is bolted to the folding fixture module 2 at the bolt holes 20. The casters 7 are fixedly installed on the bottom of the base plate 5 through the top connection holes 30, forming a connection and locking between the folding fixture module 2 and the vertical support device. After the folding fixture module 2 is assembled, the vertical support device is installed.

[0047] Adjacent folding fixture modules 2 are connected by a connecting plate 10 and a snap fastener 9. The connecting plate 10 forms the lower connecting part, and the snap fastener 9 forms the upper connecting part. (See attached image) Figure 3 One end of the connecting plate 10 is connected to one of the folding tooling modules 2, and the other end of the connecting plate 10 is connected to another folding tooling module 2.

[0048] Tooling rotating device, such as Figure 2 As shown, an auxiliary tooling rotation device is used to fold the tooling modules 2 at intervals of n (n≥2) folding tooling modules 2. The tooling rotation device includes a hinge 8 and a limiting device 11. The hinge 8 connects two adjacent folding tooling modules 2 and allows the folding tooling modules 2 to rotate relative to each other around the hinge 8. The limiting device 11 is connected to one of the folding tooling modules 2 and is used to limit the rotation angle when the two folding tooling modules 2 rotate. The limiting device 11 restricts the rotation of the tooling rotation device during the film folding process, maintaining the overall rigidity of the film auxiliary folding tooling. The tooling rotation device also serves as a left-right connecting device, realizing the inward folding and outward extension of the auxiliary tooling through the cooperation of the hinge and the buckle.

[0049] like Figure 2 , Figure 3 As shown, after the folding auxiliary tooling module 2 is connected to the vertical support device 5 and the tooling modules 2 are locked together, check whether the geometric dimensions of the assembled folding auxiliary tooling meet the requirements. Adjust the position of the auxiliary folding tooling that does not meet the requirements and reconnect and lock it.

[0050] The membrane support plate device 1 includes a membrane support plate and a vertical adjustment device. The structure of the membrane support plate is as follows: Figure 6 As shown, it includes a base plate and a vertical plate; the vertical plate is welded to the base plate. The structure of the vertical adjustment device is as follows: Figure 9 As shown, it includes a lead screw 17, a guide rail 18, a guide rail base 19, and a guide rail connecting block 21. The film support base plate is fixed on the guide rail connecting block 21. See [reference needed]. Figure 7 The bottom of the guide rail 18 is fixed to the guide rail base 19 by bolts. The guide rail 18 is fixed to the guide rail connecting block 21 on the slider plane through the connecting hole 20. The lead screw 17 cooperates with the guide rail 18. When the lead screw 17 rotates, it drives the slider of the guide rail 18 to move up and down along the rail. The guide rail base 19 and the guide rail 18 are also provided with positioning pin holes 22. A pin is inserted into the positioning pin hole to restrict the sliding of the guide rail. At the initial folding, the position of the film support plate of the film support plate device 1 is adjusted to the top of the guide rail 18, and a pin is inserted into the positioning pin hole 22 to restrict the sliding of the guide rail.

[0051] The fixing clamp is used to connect the upper end of the film to the lifting device and the lower end of the film to the auxiliary folding fixture, as well as to fix the film in its final folded state. The fixing clamp structure is as follows:Figure 17 As shown, the function of the silicone pad 33 is to prevent the film from being subjected to local stress.

[0052] Film bonding roller device, see Figure 12 The device consists of a handle 25 and a roller 26. The radius of the roller 26 is greater than the depth of the valley crease on the outer surface of the folding auxiliary fixture, and the width of the roller 26 is less than the width of the valley crease on the outer surface of the folding auxiliary fixture. The roller 26 can fit tightly against the outer surface of the auxiliary folding fixture. When folding the film, the lifting device is first operated to lower the entire film. Then, the film-fitting roller device is operated to make the outer surface of the disc of the film-fitting roller device fully fit against the valley crease 15 on the outer surface of the auxiliary folding fixture, and to make the film fit against the outer surface of the auxiliary folding fixture 2 in a circumferential motion. After one layer of film is fitted, the elastic rope is used to tighten it so that the entire layer of film fits against the panel surface of the folding auxiliary fixture 2, thus completing the folding of the current three-layer film folding unit.

[0053] like Figure 4 , Figure 5 As shown, after assembling the film folding auxiliary fixture and connecting and locking the film support base plate device, check the overall rigidity. On both sides of each folding unit on the film auxiliary folding fixture, fix both ends of the elastic rope to the elastic rope hooks 14, and tighten the elastic ropes along the valley crease 15 on the outer surface, checking the deformation of the film auxiliary folding fixture. If the overall rigidity of the film auxiliary folding fixture does not meet the requirements, necessary rigidity-increasing measures must be taken. After the inspection, release one end of the elastic rope. The elastic rope is detachable and fixed to the elastic rope hooks at both ends of the auxiliary folding fixture, arranged along the valley crease (recessed crease) of the same layer of fixture.

[0054] The initial form of the flexible film sunshade to be folded is a flat state without creases. During the folding process, the bottom end is clamped and fixed to the film support plate by a fixing clamp, and the top end is clamped and fixed by a hanging clamp. The folded film structure is fixed by the clamp, and the final form is a folded film.

[0055] like Figure 1 , Figure 13 , Figure 14 , Figure 15As shown, the film is positioned and adjusted during hoisting. The top of the film is clamped and lifted by the hoisting device, and the bottom is fixed to the mold base plate 1 by the fixing clamp 12. Further, the film bonding roller device is assembled, which consists of a handle 25 and a disc 26. When the film is folded, the hoisting device is first operated to lower the entire film, and then the film bonding roller device is operated to make the outer surface of the disc of the film bonding roller device fully fit with the valley crease 15 of the outer surface of the auxiliary folding fixture, and to make the film fit with the outer surface of the auxiliary folding fixture 2. After one layer of film is bonded, the elastic rope is tightened to make the entire layer of film fit with the panel surface of the folding auxiliary fixture 2, thus completing the folding of the current three-layer film folding unit.

[0056] Furthermore, such as Figure 1 , Figure 16 As shown, the elastic rope is removed and the film auxiliary folding fixture 2 is removed. After completing the film folding of the first three layers of folding unit height, the elastic rope is removed; further, the bolts are removed, the limiting device 11 in the fixture rotation device is removed, the buckle 9 is opened, and the bottom connecting plate 10 is removed to ensure the normal rotation of the hinge 8 in subsequent operations. The removal sequence of the limiting device 11 is to first remove it at the auxiliary fixture positions on both sides of the overall structure, and then remove it at the middle position; before the fixture device is rotated inward and removed inward as a whole, the position of the vertical support device is marked to ensure that the fixture can be restored to its original position in the future; after the limiting device 11 is removed, the fixture device is rotated inward; after rotation, the film auxiliary folding fixture 2 is folded inward as a whole; when rotating inward, the folded film structure is separated from the auxiliary folding fixture, and at this time, the clamp 31 is used to fix the folded part of the film to maintain its shape.

[0057] Furthermore, after maintaining the shape of the folded portion of the film, the entire film structure needs to be lowered. The film height reduction value is calculated based on the number of film folds each time. After the hoisting height is reduced, the restriction at the guide rail positioning pin hole 22 is removed, and the base plate is slid downwards. The sliding length value is equal to the film height reduction value. Then, the tooling rotation device is rotated outwards, so that the film auxiliary folding tooling 2 is rotated outwards to the position mark before the tooling was removed, ensuring that the film folding auxiliary tooling is completely restored to its original position. Finally, the limiting device 11 at the tooling rotation device, the bottom connecting plate 10, and the buckle 9 are installed.

[0058] Furthermore, repeat the above three assembly steps to achieve layer-by-layer folding of the membrane structure until all membrane structures are folded; the final assembly cycle only needs to proceed to the removal of the elastic rope and membrane auxiliary folding fixture 2; after all membrane layers are folded, detach the lifting device from the top of the membrane.

[0059] Furthermore, after the entire film structure is folded and the folded film is separated from the film folding auxiliary fixture, the folded film is fixed in place to ensure it remains fully folded during installation and transportation. First, the second clamping plate 12 is used to press down on the film as a whole. Then, the bolt connection between the lower clamping plate 12 and the mold base plate 1 is removed. Next, the clamps used for temporary fixing are removed. Finally, elastic ropes are used to wrap and bind the upper and lower clamping plates of the film, fixing the upper and lower clamping plates and the folded film between them.

[0060] Furthermore, after the folded film structure is fully folded and fixed, it is necessary to disassemble each part for easy transportation and storage. First, the connections between the film auxiliary folding fixture modules are disassembled, including the removal of clips 9, connecting plates 10, and hinges 8 and clips 9. Simply open the clips 9 to release the connection, remove the bolts on the connecting plate 10, and remove the connecting plate 10. Remove the connecting bolts on both sides of the hinge 8 and the limiting device 11, and remove the fixture rotation device. Next, the connection between the film auxiliary folding fixture module and the vertical support device 5 is disassembled by removing the bolts at the corresponding connection points. Then, the modules within the film auxiliary folding fixture are disassembled by opening the clips 9 connecting the units within the auxiliary fixture and removing the corresponding connecting plates and bolts. Finally, the film support base plate device is disassembled by first disconnecting the connections between the base plates, removing the connecting plates and bolts, and then removing the bolts on the guide rail to detach it from the base plate. After all disassembly is complete, pack the disassembled devices into boxes, and simultaneously pack the fully folded and shaped film structure into boxes.

[0061] This process folds the thin-film sunshade from a flat state into a folded state based on an origami configuration, offering advantages such as simple design, easy operation, and reusability. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this invention, and these improvements and modifications should also be considered within the scope of protection of this invention.

Claims

1. A rope-constrained film sunshade folding fixture, characterized in that, include: Auxiliary folding fixture, used to assist in folding the film; The outer surface of the auxiliary folding fixture is provided with creases, including mountain creases and valley creases; Elastic ropes are used to ensure the adhesion between the film and the outer surface of the auxiliary folding fixture, as well as to shape the folded film, and are fixed at both ends of the auxiliary folding fixture. A film laminating roller device is used to assist in laminating the film to the outer surface of the folding tool panel; The film bonding roller device includes rollers, which press the film into the valley fold to achieve bonding of the film with the outer surface of the folding fixture panel; The fixing clamp is used to connect the upper end of the film to the lifting device, the lower end of the film to the auxiliary folding fixture, and to fix the film in its final folded state. Clamps are used to shape and fix the folded portion of the film; A film support plate device is used to place the folded film and adjust its position. Vertical support device, used to fix and support the folding auxiliary tooling and to assist in the movement of the folding auxiliary tooling; The auxiliary folding fixture is composed of folding fixture modules connected together; each folding fixture module has elastic rope hooks at both ends. The folding fixture module is also provided with an inner connector, a top inner connector, and a connecting buckle; the connecting buckle is used to connect two adjacent folding fixture modules.

2. The rope-constrained film sunshade folding fixture according to claim 1, characterized in that: The vertical support device includes a base plate and feet and casters mounted on the base plate; the folding auxiliary fixture is fixed on the base plate.

3. The folding fixture for a rope-constrained film sunshade according to claim 1, characterized in that: The film support base plate device includes a film support base plate and a vertical adjustment device. The film support base plate is disposed on the vertical adjustment device, and the vertical adjustment device adjusts the position of the film support base plate in the height direction.

4. The rope-constrained film sunshade folding fixture according to claim 3, characterized in that: The vertical adjustment device includes a lead screw, a guide rail, and a guide rail base; the film support plate is fixed on the guide rail; the guide rail is mounted on the guide rail base; the lead screw cooperates with the guide rail, and when the lead screw rotates, it drives the guide rail to move up and down along the guide rail base.

5. The rope-constrained film sunshade folding fixture according to claim 1, characterized in that: The elastic rope is fixed to the elastic rope hooks at both ends of the auxiliary folding fixture and is arranged along the valley folds of the auxiliary folding fixture in the same layer.

6. A folding method based on the rope-constrained film sunshade folding fixture according to any one of claims 1-5, characterized in that, include: Clamp and lift the top of the film with a lifting device, and fix the bottom of the film to the mold base plate with a fixing clamp; When the film is folded, the lifting device is first used to lower the entire film. Then, the film bonding roller device is operated to make the outer surface of the disc of the film bonding roller device fully fit with the valley crease of the outer surface of the auxiliary folding fixture. The roller device moves in a circle to make the film fit with the outer surface of the auxiliary folding fixture. After one layer of film is bonded, the elastic rope is tightened to make the entire layer of film fit with the panel surface of the folding auxiliary fixture, thus completing the folding of the current three-layer film folding unit. Remove the elastic rope and dismantle the film-assisted folding fixture; After maintaining the shape of the folded portion of the film, the entire film structure is lowered. The film height reduction value is calculated based on the number of film folds each time. After the hoisting height is reduced, the restriction at the guide rail positioning pin hole is removed, and the base plate is slid downwards. The sliding length is equal to the film height reduction value. Then, the tooling rotation device is rotated outwards, so that the film auxiliary folding tooling is rotated outwards to the position mark before the tooling was removed. Ensure that the film folding auxiliary tooling is completely restored to its original position. Finally, the limiting device at the tooling rotation device, the bottom connecting plate, and the fixing buckle are installed. Follow the above steps to fold the membrane structure layer by layer until all membrane structures are folded; the final assembly process cycle only needs to proceed to the step of removing the elastic rope and membrane auxiliary folding tool; after all membrane layers are folded, detach the lifting device from the top of the membrane. After the entire thin film structure is folded, the folded thin film is fixed in its current state.

7. The folding method according to claim 6, characterized in that, The method for removing the elastic rope and the film-assisted folding fixture is as follows: After completing the folding of the film to the height of the first three folding units, remove the elastic rope; further remove the bolts, remove the limiting device in the fixture's rotating device, open the buckle, and remove the bottom connecting plate to ensure the normal rotation of the hinge in subsequent operations; the limiting device is removed in the following order: first at the auxiliary fixture positions on both sides of the overall structure, and then at the middle position; before rotating the fixture inward and removing it entirely inward, mark the position of the vertical support device to ensure that the fixture can be restored to its original position later; after removing the limiting device, rotate the fixture inward; after rotating, fold the film-assisted folding fixture entirely inward; during inward rotation, the folded film structure separates from the auxiliary folding fixture, and at this time, use a clamp to fix and maintain the shape of the folded part of the film.

8. The folding method according to claim 6, characterized in that, The method for fixing the folded film is as follows: use the second clamping plate to press down the film as a whole, remove the bolt connection between the lower clamping plate of the film and the mold base plate, then remove the clamps used for temporary fixing, and finally use elastic rope to wrap and bind the upper and lower clamping plates of the film to fix the upper clamping plate, the lower clamping plate and the folded film in between.

Images