A method of forming a twist beam

Abstract

The application discloses a twist truss forming method, comprising the following steps: S100, modeling the twist truss to generate assembling data and each rod data, wherein the rod data comprises the size of each twist wall plate and twist data; S200, cutting raw materials according to the size of the twist wall plate to generate flat wall plates, i.e. the initial surface materials of each rod; S300, manufacturing a lower mold corresponding to a plurality of data points according to the twist data of each twist wall plate, and fixing the lower mold on the lower rack of a press; S400, twisting the flat wall plates into final twist wall plates by the press; S500, assembling and welding four twist wall plates of the same rod to form a rod; and S600, performing ground lofting according to the assembling data, supporting the main rod of the truss, and sequentially welding other rods of the truss one by one. The twist truss forming method is reasonable in design and provides a technical basis for the accurate construction of special-shaped and personalized steel building design.

Description

Technical Field

[0001] This invention relates to the field of folded truss technology, and in particular to a method for forming a folded truss. Background Technology

[0002] Modern steel building design increasingly demands personalized, artistic, and free design. To achieve personalized design, engineering projects often employ irregularly shaped twisted structures with varying spatial angles, which presents significant adjustment challenges for manufacturing, especially in terms of short cycles and high precision.

[0003] The existing sheet metal processing method for processing twisted surfaces, as described in CN111531038A, includes an upper mold assembly and a lower mold assembly. The upper mold assembly includes an upper base plate and an upper mold disposed on the upper base plate. The lower mold assembly includes a lower base plate and a lower mold disposed on the lower base plate. The upper mold assembly is connected to the upper press head of a press. The opposing surfaces of the upper mold and the lower mold are respectively a matching upper twisted surface and a lower twisted surface.

[0004] like Figure 1 As shown, in the prior art, the upper pressure block has a fixed shape and does not rotate. During the downward pressing process, the steel plate first bends, and then undergoes secondary deformation after the upper and lower pressure blocks are pressed together. This is because the fixed-shape upper pressure block cannot adapt to the angle changes of the steel plate during the bending and twisting process, and can only force the steel plate to be squeezed according to its own shape, resulting in uneven stress on the steel plate at different stages, which easily produces additional unexpected deformations and affects the bending and twisting accuracy.

[0005] Therefore, it is necessary to improve the existing methods for forming twisted trusses. Summary of the Invention

[0006] The purpose of this invention is to overcome the defects in the existing technology and provide a method for forming a twisted truss, providing a technical basis for the precise construction of irregularly shaped and personalized steel building designs.

[0007] To achieve the above technical effects, the technical solution of the present invention is as follows: a method for forming a twisted truss, comprising: step S100, data processing: modeling the twisted truss, generating assembly data and data for each member, wherein the member data includes the dimensions of each twisted panel and twist data; step S200, cutting: cutting the raw material according to the dimensions of the twisted panel to generate a flat panel, i.e., the initial surface material of each member; step S300, fabrication and installation of the lower mold: according to the dimensions of each member... The following steps are performed: Step S400: Folding and twisting of the wall panel: The flat wall panel is folded and twisted into the final folded and twisted wall panel using the press; Step S500: Welding and assembling of four folded and twisted wall panels of the same member: Four folded and twisted wall panels of the same member are assembled and welded to form a member; Step S600: Truss assembly: The ground is laid out according to the assembly data, the main members of the truss are supported, and the other members of the truss are welded one by one.

[0008] According to one embodiment of the present invention, in step S100, the size of the twisted wall panel is obtained by fitting the twisted wall panel into dense triangular planar units, and then adjusting the included angle between these triangular planes to 180 degrees, that is, unfolding it into a plane, which is the size of the initial surface material.

[0009] According to one embodiment of the present invention, the press includes a fixedly arranged upper frame and a lower frame, and a bending and twisting unit is provided between the upper frame and the lower frame. A plurality of bending and twisting units are spaced apart along the extending direction of the lower frame. Each bending and twisting unit includes a pressure applying component and a lower die. The pressure applying component includes a first driving component and a rotatably arranged upper pressure block. The first driving component is used to drive the lifting and lowering of the upper pressure block. The axis of rotation of the upper pressure block is parallel to the extending direction of the upper frame. The lower die is provided with a bearing surface that cooperates with the bending and twisting wall panel.

[0010] According to one embodiment of the present invention, the first drive assembly includes a first hydraulic cylinder, the cylinder body of the first hydraulic cylinder is fixedly connected to the upper frame, the piston rod of the first hydraulic cylinder is fixedly provided with a pressure block seat, and the upper pressure block is rotatably connected to the pressure block seat.

[0011] According to one embodiment of the present invention, the upper frame is provided with a first guide groove, and the pressure block seat is fixedly provided with a first guide rod that is slidably connected to the first guide groove, wherein the extension direction of the first guide groove is vertically arranged.

[0012] According to one embodiment of the present invention, the lower mold is detachably fixedly connected to the lower frame.

[0013] According to one embodiment of the present invention, the lower frame is provided with a mounting groove, and the lower mold is provided with a base that limits and cooperates with the mounting groove, and the base and the mounting groove are fixedly connected by bolts.

[0014] According to one embodiment of the present invention, the number of bending and twisting units is odd.

[0015] According to one embodiment of the present invention, step S400 further includes: step S410, positioning the flat wall panel on the lower mold; step S420, driving the upper pressure block downwards with the first driving component until the upper pressure block contacts the wall panel; step S430, as the first driving component continues to drive the upper pressure block downwards, the free rotation of the upper pressure block ensures that it is always in contact with the wall panel surface and cooperates with the lower mold to fold and twist the wall panel; in step S400, the operation sequence of the odd number of folding and twisting units is: folding and twisting operations are completed sequentially from the middle to both sides.

[0016] According to one embodiment of the present invention, step S500 further includes: step S510, removing the lower mold from the lower frame and fixing it on the assembly platform; step S520, fixing the folding and twisting wall panel adapted to the lower mold onto the lower mold, and splicing and welding the folding and twisting wall panels on the other three sides thereon.

[0017] The advantages and beneficial effects of this invention are as follows: The method for forming a twisted truss is rationally designed. By modeling and disassembling the twisted truss into individual members, and processing the data of the wall panels of each member to obtain the flat wall panel dimensions and twisting data, a press folds and twists each flat wall panel into the required twisted wall panel. Four twisted wall panels of the same member are spliced ​​and welded together to form a member, and several members are then welded together to finally form a twisted truss. This provides a technical basis for the precise construction of irregularly shaped and personalized steel building designs. Attached Figure Description

[0018] Figure 1 This is a flowchart of how a press in the sheet metal processing field twists and deforms a steel plate by pressing it down; Figure 2 This is a schematic diagram of the press for the folding and twisting truss of the present invention; Figure 3 yes Figure 1 An explosion diagram; Figure 4 This is a structural schematic diagram of the bending and twisting unit and the load-bearing unit; Figure 5 This is a structural diagram of the upper rack; Figure 6 This is a structural schematic diagram of the load-bearing unit; Figure 7 yes Figure 5 An explosion diagram; Figure 8 This is a flowchart of the process of the press of the present invention twisting and deforming the steel plate. In the diagram: 1. Upper frame; 11. First guide groove; 2. Lower frame; 21. Mounting groove; 22. Second guide groove; 3. Pressing assembly; 31. Upper pressure block; 32. First hydraulic cylinder; 33. Pressure block seat; 331. First guide rod; 4. Lower mold; 41. Bearing surface; 42. Base; 5. Bolt; 6. Bearing unit; 61. Bearing plate; 611. Second guide rod; 612. Slide groove; 62. Second hydraulic cylinder; 7. Baffle; 71. Slider; 72. Screw. Detailed Implementation

[0019] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0020] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "horizontal," "vertical," "top," 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 of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Example

[0021] like Figure 2-7 As shown, the method for forming a twisted truss in this embodiment includes: Step S100, data processing: modeling the twisted truss and generating assembly data and data for each member, the member data including the dimensions of each twisted panel and the twisting data; Step S200, material cutting: cutting the raw material according to the dimensions of the twisted panel to generate a flat panel, i.e., the initial surface material of each member; Step S300, lower mold making and installation: making several lower molds 4 corresponding to data points according to the twisting data of each twisted panel, and fixing the lower molds 4 on the lower frame 2 of the press; Step S400, panel twisting: twisting the flat panel into the final twisted panel using the press; Step S500, member welding: assembling and welding four twisted panels of the same member to form the member; Step S600, truss assembly: laying out on the ground according to the assembly data, supporting the main members of the truss, and welding the other members of the truss one by one.

[0022] This design ensures processing precision: first, precise rod data is generated through modeling; then, the initial surface material is cut precisely according to the dimensions during material preparation; next, a matching lower mold is made according to the bending and twisting data; and finally, the material is bent and twisted using a press. The data of each step are interconnected and precisely correspond, ensuring the dimensional and morphological accuracy of the bent and twisted wall panels and subsequent rods and trusses, providing a foundation for the precise construction of irregularly shaped and personalized steel buildings.

[0023] According to one embodiment of the present invention, in step S100, the size of the twisted wall panel is obtained by fitting the twisted wall panel into dense triangular planar units, and then adjusting the included angle between these triangular planes to 180 degrees, that is, unfolding it into a plane, which is the size of the initial surface material.

[0024] This design allows for precise determination of the initial surface material dimensions. By fitting the twisted wall panel into dense triangular planar units and then adjusting the included angle between these triangular planes to 180 degrees to unfold them into a plane, a precise transformation from an irregular twisted structure to a flat initial surface material is achieved. This provides accurate data for subsequent cutting of raw materials according to these dimensions to generate flat wall panels, ensuring the dimensional correspondence between the initial surface material and the final twisted wall panel. This lays the foundation for high precision in the entire twisted truss forming process and meets the needs of precise construction of irregularly shaped personalized steel building designs.

[0025] According to one embodiment of the present invention, the press includes a fixedly arranged upper frame 1 and a lower frame 2. A bending and twisting unit is provided between the upper frame 1 and the lower frame 2. A plurality of bending and twisting units are arranged at intervals along the extension direction of the lower frame 2. The bending and twisting unit includes a pressure application component 3 and a lower mold 4. The pressure application component 3 includes a first drive component and a rotatably arranged upper pressure block 31. The first drive component is used to drive the upper pressure block 31 to rise and fall. The rotation axis of the upper pressure block 31 is parallel to the extension direction of the upper frame 1. The lower mold 4 is provided with a bearing surface 41 that cooperates with a single bending and twisting wall plate of the truss member. The inclination angle of the bearing surface 41 is adapted to the inclination angle of the bending and twisting wall plate at this location. The bending and twisting wall plate is sandwiched between the upper pressure block 31 and the bearing surface 41.

[0026] like Figure 1 Figure 8 As shown, in the prior art, the upper pressure block has a fixed shape and does not rotate. During the downward pressing process, the steel plate first bends, and then undergoes secondary deformation after the upper and lower pressure blocks are pressed together. This is because the fixed-shape upper pressure block cannot adapt to the angle changes of the steel plate during the bending and twisting process, and can only force the steel plate to be squeezed according to its own shape, resulting in uneven stress on the steel plate at different stages, which easily produces additional unexpected deformations and affects the bending and twisting accuracy.

[0027] The rotatable upper pressure block in this design improves the adaptability and precision of folding and twisting. The upper pressure block better adapts to angle changes in the folded and twisted panel during processing. When the lower pressure block contacts the panel, it can adjust its contact posture by rotating. Combined with the bearing surface on the lower mold that matches the tilt angle of the panel at that point, the panel can be precisely folded and twisted at a preset angle while being clamped, ensuring the angular accuracy of the folding and twisting position. This avoids the secondary deformation problem caused by the fixed upper pressure block in existing technologies, significantly improving the forming accuracy of the folded and twisted panel.

[0028] According to one embodiment of the present invention, the first drive assembly includes a first hydraulic cylinder 32, the cylinder body of the first hydraulic cylinder 32 is fixedly connected to the upper frame 1, the piston rod of the first hydraulic cylinder 32 is fixedly provided with a pressure block seat 33, and the upper pressure block 31 is rotatably connected to the pressure block seat 33.

[0029] Stable and powerful drive: The first hydraulic cylinder, as the driving source, can provide continuous and stable pressure, which can meet the driving force requirements during the processing of the twisted wall panel and ensure that the upper pressure block can effectively complete the pressure and twisting action on the wall panel.

[0030] Reliable connection and easy rotation fit: The upper pressure block can flexibly adjust the angle during the pressure application process to better adapt to the processing requirements of the twisted wall panel.

[0031] According to one embodiment of the present invention, the upper frame 1 is provided with a first guide groove 11, and the pressure block seat 33 is fixedly provided with a first guide rod 331 that is slidably connected to the first guide groove 11, and the extension direction of the first guide groove 11 is vertically arranged.

[0032] To ensure motion accuracy: The first guide groove extends vertically, and the first guide rod slides in conjunction with the first guide groove, which can strictly guide the lifting and lowering movement of the pressure block seat and the upper pressure block, ensuring that the upper pressure block can only move stably in the vertical direction, avoiding lateral deviation or shaking during the lifting and lowering process, thereby ensuring the precise pressure position of the upper pressure block on the folded and twisted wall panel.

[0033] According to one embodiment of the present invention, the lower mold 4 and the lower frame 2 are detachably fixedly connected.

[0034] Adaptable to diverse processing needs: Due to differences in the specifications and twisting angles of truss twisted panels, the corresponding lower die bearing surfaces also need to be different. The detachable connection allows for easy replacement of the appropriate lower die based on the specific parameters of the twisted panel being processed, improving the press's versatility and flexibility in processing different models and specifications of truss twists.

[0035] According to one embodiment of the present invention, the lower frame 2 is provided with a mounting groove 21, and the lower mold 4 is provided with a base 42 that limits and cooperates with the mounting groove 21. The base 42 and the mounting groove 21 are fixedly connected by bolts 5.

[0036] Improved installation positioning accuracy: The limiting fit between the mounting slot and the base enables rapid positioning of the lower mold during installation, ensuring that the bearing surface of the lower mold is in the preset precise position. This avoids affecting the processing accuracy of the twisted wall panel due to installation deviations, providing a basic guarantee for the accuracy of subsequent twisting operations.

[0037] Easy to assemble and disassemble: The limiting structure of the mounting slot guides the base into position quickly during installation, and the bolt connection facilitates disassembly and tightening. When it is necessary to change to different specifications of the lower mold to meet different processing requirements of twisted wall panels, it simplifies the assembly and disassembly process, improves work efficiency, and also facilitates the maintenance of the lower mold.

[0038] According to one embodiment of the present invention, it further includes a support assembly for supporting the twisted wall panel in the initial state. The support assembly includes a support unit 6, and a plurality of support units 6 are provided along the extension direction of the lower frame 2.

[0039] Easy initial placement and positioning: The twisted wall panel is flat in the initial state, and the load-bearing components can provide a stable support surface, making it easy to place the wall panel smoothly in the preset processing position, avoiding wall panel shaking or position displacement caused by lack of support, and laying the foundation for accurate subsequent twisting operations.

[0040] Improved processing efficiency and safety: The stable load-bearing structure allows operators to perform subsequent bending and twisting operations without manually supporting the wall panels, reducing manual intervention, which not only improves work efficiency but also reduces potential safety hazards caused by manual support.

[0041] According to one embodiment of the present invention, the support unit 6 includes a support plate 61 and a second drive assembly for driving the support plate 61 to rise and fall. The support plate 61 has two working positions: in the first working position, the support plate 61 is not lower than the highest point of the support surface 41; in the second working position, the support plate 61 is not lower than the lowest point of the support surface 41.

[0042] Adaptable to the entire processing flow: In the first working position, the support plate is not lower than the highest point of the support surface, which can provide stable support for the twisting wall panel in the initial stage, making it easy to place the wall panel smoothly and accurately position it, avoiding the wall panel from shaking or shifting due to insufficient support, and ensuring the initial position accuracy of subsequent twisting operations; In the second working position, the support plate is not lower than the lowest point of the support surface, which will not interfere with the twisting operation of the upper pressure block and the lower mold on the wall panel, and can also provide auxiliary support for the wall panel during the twisting process.

[0043] The support plate is initially located in the first working position, and the flat wall panel is placed on the support plate. As the first hydraulic cylinder drives the upper pressure block to descend, when the upper pressure block just touches the wall panel, the support plate moves to the second working position to assist in supporting the wall panel.

[0044] According to one embodiment of the present invention, the second drive assembly includes a second hydraulic cylinder 62, the cylinder body of the second hydraulic cylinder 62 is fixedly connected to the lower frame 2, and the bearing plate 61 is fixedly connected to the piston rod of the second hydraulic cylinder 62.

[0045] Stable and reliable drive: The hydraulic cylinder, as the drive source, can provide continuous and stable power, and can precisely control the lifting speed and position of the support plate. This ensures that the support plate moves stably when switching between the first and second working positions, avoiding shaking of the support plate due to unstable driving force, and ensuring the support effect of the initial twisted wall panel.

[0046] According to one embodiment of the present invention, the lower frame 2 is provided with a second guide groove 22, and the bearing plate 61 is fixedly provided with a second guide rod 611 that is slidably connected to the second guide groove 22. The extension direction of the second guide groove 22 is vertical.

[0047] To ensure the lifting accuracy of the bearing plate: The vertically set second guide groove and the second guide rod form a sliding fit, which can strictly limit the movement trajectory of the bearing plate and ensure that it can only be lifted and lowered stably in the vertical direction, avoiding lateral deviation, tilting or shaking of the bearing plate during the lifting process.

[0048] According to one embodiment of the present invention, the support plate 61 is provided with a baffle 7 to prevent displacement after the twisted wall panel is twisted; the support plate 61 is provided with a sliding groove 612, and the baffle 7 is provided with a slider 71 that is slidably connected to the sliding groove 612, the extension direction of the sliding groove 612 is perpendicular to the axis of rotation of the upper pressure block 31; a screw 72 is rotatably provided in the sliding groove 612, and the slider 71 is threadedly connected to the screw 72.

[0049] Preventing displacement of folded and twisted panels and ensuring processing accuracy: The baffle can directly prevent unnecessary displacement of the folded and twisted panels during processing, avoid deviations in folded and twisted dimensions caused by panel position offset, and ensure that each folded and twisted part can be accurately formed according to preset parameters, providing a stable foundation for subsequent panel welding and assembly into truss members.

[0050] Adaptable to different specifications of wall panels, enhancing versatility: The baffle is slidably connected to the support plate via a slider and a groove, with the groove extending perpendicular to the axis of rotation of the upper pressure block. The screw inside the groove connects to the slider via a threaded connection, allowing the baffle's position to be adjusted by rotating the screw. This adjustable structure can accommodate folding and twisting wall panels of different widths and sizes, meeting diverse processing needs and improving the equipment's versatility and flexibility.

[0051] According to one embodiment of the present invention, an odd number of bending and twisting units are provided.

[0052] This design allows an odd number of twisting units to form a symmetrical working pattern with the central unit as the reference. In this pattern, starting work from the central twisting unit and progressing gradually to both sides effectively reduces errors caused by premature deformation of the panel due to unilateral stress. The twisting operations on both sides can use the already formed twisted section in the middle as a reference, balancing the forces and making the overall twisting process of the panel more stable. The final twisted shape better matches the preset twisting data, improving the forming accuracy of the twisted panel and ensuring high precision for subsequent member welding and truss assembly.

[0053] According to one embodiment of the present invention, step S400 further includes: step S410, positioning the flat wall panel on the lower mold 4; step S420, driving the upper pressure block 31 downward until the upper pressure block 31 contacts the wall panel; step S430, as the first driving component continues to drive the upper pressure block 31 downward, the free rotation of the upper pressure block 31 can ensure that it is always in contact with the wall panel surface and cooperates with the lower mold 4 to fold and twist the wall panel; in step S400, the operation sequence of the odd number of folding and twisting units is: folding and twisting operations are completed sequentially from the middle to both sides.

[0054] According to one embodiment of the present invention, step S500 further includes: step S510, removing the lower mold 4 from the lower frame 2 and fixing it on the assembly platform; step S520, fixing the folding and twisting wall panel adapted to the lower mold 4 on the lower mold 4, and splicing and welding the folding and twisting wall panels on the other three sides thereon.

[0055] The aforementioned twisted truss forming method achieves the goal of short cycle and high precision through a systematic digital forming process, precise and controllable twisting technology, and integrated processing and assembly design.

[0056] A systematic digital forming process: By modeling the twisted truss to generate assembly data and member data, the twisted wall panel is fitted into a dense triangular planar unit and unfolded to obtain the initial size. This realizes the digital transformation from irregular structure to planar processing and then to precise twisting, solving the problem of accurately obtaining the size of irregular twisted wall panels and breaking through the limitations of relying on experience estimation in traditional processing.

[0057] Precise and controllable folding and twisting process: A folding and twisting unit with a rotating upper pressure block is designed. The upper pressure block can rotate freely with the folding and twisting angle of the wall panel and always keeps in contact with the wall panel surface. Combined with a lower mold with an adapted bearing surface, the accuracy of the folding and twisting angle is guaranteed. Using an odd number of folding and twisting units and operating in the order from the middle to both sides reduces the cumulative error and improves the overall forming accuracy.

[0058] Integrated processing and assembly design: The lower mold used for bending and twisting is directly used as the positioning reference for subsequent welding of rods, avoiding secondary positioning errors, improving the accuracy and efficiency of rod assembly, and solving the problem of positioning difficulties when assembling irregular structures.

[0059] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for forming a twisted truss, characterized in that, include: Step S100, Data Processing: Model the twisted truss and generate assembly data and data for each member. The member data includes the dimensions of each twisted panel and the twist data. Step S200, material cutting: Cut the raw material according to the size of the twisted wall panel to generate a flat wall panel, that is, the initial surface material of each of the rods; Step S300, Fabrication and installation of the lower mold: Based on the folding and twisting data of each folding and twisting wall panel, fabricate several lower molds (4) corresponding to data points, and fix the lower molds (4) on the lower frame (2) of the press; Step S400, Panel Folding and Twisting: The flat panel is folded and twisted into the final folded and twisted panel using the press. Step S500, Member Welding: Assemble and weld four twisted wall panels of the same member to form a member; Step S600, Truss Assembly: Based on the assembly data, lay out the ground, support the main members of the truss, and weld the other members of the truss one by one. The press includes an upper frame (1) and a lower frame (2) extending along a first direction. A bending and twisting unit is provided between the upper frame (1) and the lower frame (2). Several bending and twisting units are spaced apart along the first direction. The bending and twisting unit includes a pressure application component (3) and a lower mold (4). The pressure application component (3) includes a first drive component and a rotating upper pressure block (31). The first drive component is used to drive the upper pressure block (31) to rise and fall. The rotation axis of the upper pressure block (31) is parallel to the first direction. The lower mold (4) is provided with a bearing surface (41) that cooperates with the bending and twisting wall plate. The inclination angle of the bearing surface (41) is adapted to the inclination angle of the bending and twisting wall plate at this point. The bending and twisting wall plate is sandwiched between the upper pressure block (31) and the bearing surface (41). The step S400 further includes: step S410, confining the flat wall panel on the lower mold (4); Step S420: The first drive assembly drives the upper pressure block (31) to descend until the upper pressure block (31) contacts the wall panel. Step S430: As the first drive component continues to drive the upper pressure block (31) to descend, the free rotation of the upper pressure block (31) can ensure that it is always in contact with the wall panel surface and cooperates with the lower mold (4) to fold and twist the wall panel.

2. The method for forming a twisted truss according to claim 1, characterized in that, In step S100, the dimensions of the twisted wall panel are obtained by fitting the twisted wall panel into dense triangular planar units, and then adjusting the included angle between these triangular planes to 180 degrees, that is, unfolding it into a plane, which is the initial surface material dimension.

3. The method for forming a twisted truss according to claim 1, characterized in that, The first drive assembly includes a first hydraulic cylinder (32), the cylinder body of the first hydraulic cylinder (32) is fixedly connected to the upper frame (1), the piston rod of the first hydraulic cylinder (32) is fixedly provided with a pressure block seat (33), and the upper pressure block (31) is rotatably connected to the pressure block seat (33).

4. The method for forming a twisted truss according to claim 3, characterized in that, The upper frame (1) is provided with a first guide groove (11), and the pressure block seat (33) is fixedly provided with a first guide rod (331) that is slidably connected to the first guide groove (11). The extension direction of the first guide groove (11) is vertical.

5. The method for forming a twisted truss according to claim 1, characterized in that, The lower mold (4) is detachably and fixedly connected to the lower frame (2).

6. The method for forming a twisted truss according to claim 5, characterized in that, The lower frame (2) is provided with an installation groove (21), and the lower mold (4) is provided with a base (42) that is matched with the installation groove (21). The base (42) and the installation groove (21) are fixedly connected by bolts (5).

7. The method for forming a twisted truss according to claim 5, characterized in that, The number of bending and twisting units is odd.

8. The method for forming a twisted truss according to claim 7, characterized in that, In step S400, the working order of the odd number of folding and twisting units is as follows: the folding and twisting operation is completed sequentially from the middle to both sides.

9. The method for forming a twisted truss according to claim 5, characterized in that, Step S500 also includes: Step S510: Remove the lower mold (4) from the lower frame (2) and fix it on the assembly platform; Step S520: Fix the folding and twisting wall panel that is compatible with the lower mold (4) onto the lower mold (4), and splice and weld the folding and twisting wall panels on the other three sides to it.

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