Foldable expandable frame structure and topology optimization design method thereof

Abstract

The application relates to a folding extensible frame structure applied to the technical field of frame structures and a topological optimization design method thereof, which comprises a steel main frame, a generator module, alloy bolts, rotating seats, a buffer expansion module, a central shaft, a buffer assembly, buffer springs, assembly grooves, group connecting blocks and ground contact feet. The buffer expansion module is rotatably and foldably installed at the left and right ends of the steel main frame, the generator module is slidably connected with the assembly grooves through the group connecting blocks, when the steel main frame drags the generator module, the buffer assembly is used for buffering the inertial force of the generator module, the installation stability of the generator module and the steel main frame is effectively improved, when the steel main frame is static, the buffer expansion module is rotated to the side surface of the steel main frame and forms a triangular stable support state of the buffer expansion module, the steel main frame and the ground, the ground contact feet are contacted with the ground, and thus the buffer assembly is used for laterally protecting the generator module from impact.

Description

Technical Field

[0001] This invention relates to a vehicle frame structure, and more particularly to a foldable, expandable vehicle frame structure and its topology optimization design method applied in the field of vehicle frame structure technology. Background Technology

[0002] Generator trailers are equipment that provides outdoor power supply. Generator trailers have various structures and functions. In order to improve the stability of the generator, a more stable frame is required. The frame is a frame structure that spans the front and rear axles of the vehicle, commonly known as a beam. It is generally composed of two longitudinal beams and several transverse beams. Through the suspension device, front axle, and frame, it must have sufficient strength and rigidity to withstand the load of the vehicle and the impact from the wheels.

[0003] Chinese patent CN115107876A discloses "A High-Strength Frame Assembly for Heavy-Duty Trucks," which employs a segmented force-dissipating method to offset the strong impact force generated during vehicle collisions. The protective frame connected to the frame uses a splicing and locking installation method, replacing the shortcomings of traditional welded frames. Because the existing technology treats the entire frame as a single unit, when the impact force on the front end of the frame is too large, and the frame lacks internal force-dissipating components, it exceeds the maximum bearing capacity of the frame steel, causing frame deformation or direct breakage. This effectively reduces the time of frame damage and improves the protection of the cab. Chinese patent CN210555125U discloses "A Demountable Modular Frame Frame," which provides a universal body frame platform for modularization. It can be matched with different upper bodies to achieve modular development of vehicle models. It also features a good collision energy absorption structure and multiple transmission paths to ensure the safety of the passenger compartment. It can support the expansion of different vehicle models, has excellent lightweight design, adopts a frame structure, can be produced using profile processing, and does not require expensive stamping dies and welding tooling. It has high strength and rigidity.

[0004] To enhance the stability of the arrangement between the generator and the chassis, existing generator trailers typically have multiple sets of buffer components installed together. During high-speed travel, due to the high mass of the generator itself, the forward inertial force experienced by the generator is strong. Especially during emergency braking, insufficient buffer spacing can affect the fixed stability between the generator and the chassis. Furthermore, traditional buffer components cannot be switched or adjusted according to the driving and stationary states of the generator trailer, thus providing insufficient protection for the chassis and the generator. Summary of the Invention

[0005] The technical problem that this invention aims to solve in view of the above-mentioned prior art is that, due to the high mass of the generator itself, the insufficient buffer spacing during emergency braking will affect the fixed stability between the generator and the frame. Furthermore, traditional buffer components cannot be adjusted for functional switching, resulting in insufficient protection for the frame and the generator.

[0006] To address the aforementioned issues, this invention provides a foldable, expandable frame structure and its topology optimization design method, comprising a steel main frame, a generator module mounted on the top of the steel main frame, fixed seats equidistantly connected to the middle of the steel main frame, and solid connectors equidistantly fixed to the bottom of the generator module, the solid connectors corresponding to the fixed seats, and alloy bolts threaded through the solid connectors and the fixed seats.

[0007] Rotary seats are rotatably connected to both ends of the steel main frame. A buffer expansion module is hinged to the bottom of the rotating seat. A central shaft is fixedly connected to the middle of the buffer expansion module. Buffer assemblies and buffer springs are movably sleeved in the middle and at both ends of the central shaft, respectively. Two sets of buffer springs are fixedly connected to the front and rear ends of the buffer assembly, respectively. An assembly slot is fixedly opened on the top of the buffer assembly. An assembly block is fixedly connected to the bottom of the generator module. The assembly block is slidably connected to the assembly slot.

[0008] The bottom of the buffer assembly is fixedly connected to a grounding foot, which is slidably connected to the bottom of the buffer expansion module, and extends from the end of the buffer expansion module away from the rotating seat.

[0009] In the above-mentioned foldable expandable frame structure and its topology optimization design method, the generator module is slidably connected to the assembly slot through the assembly block, thereby using the buffer assembly to buffer the inertial force of the generator module. When the buffer expansion module rotates to the side of the steel main frame, the ground-contacting foot contacts the ground, thereby realizing the lateral impact protection of the generator module by the buffer assembly.

[0010] As a further improvement of this application, the buffer expansion module is horizontally aligned with the edge of the steel main frame, and a pin joint is fixedly connected to the end of the buffer expansion module away from the rotating seat. The pin joint is snapped into the steel main frame. When the buffer expansion module is rotated and folded to the side edge of the steel main frame, the pin joint is used to snap into the steel main frame and the pin is inserted and fixed, thereby effectively improving the stability of the folded state of the buffer expansion module.

[0011] As a further improvement of this application, a notch is provided on the outside of the end of the buffer expansion module away from the rotating seat. A rotating leg is rotatably connected inside the notch. The rotating leg is parallel to the notch and the length of the rotating leg corresponds to the height of the buffer expansion module from the ground. The rotating leg inside the notch rotates downward and contacts the ground first, thereby facilitating the outward rotation of the buffer expansion module.

[0012] As a further improvement of this application, the bottom of the rotating outrigger is rotatably connected to a universal support, and the bottom of the universal support is rotatably connected to a wheel. By utilizing the universal support and the wheel, the free movement capability of the rotating outrigger is effectively improved.

[0013] As another improvement of this application, the universal support is externally hinged with an operating lever, and the rotating leg is externally provided with a storage slot. The operating lever is engaged with the storage slot. The universal support can be manually turned by pulling the operating lever, which facilitates the rotating leg to drive the buffer extension module to rotate outward, and also facilitates the manual adjustment of the wheels to align with the notch slot, thereby facilitating the rotating leg to return to the notch slot.

[0014] As a further improvement to this application, a cover plate is fixedly connected to the top of the buffer expansion module, and the upper opening of the notch slot is fixedly connected to the cover plate. The cover plate is made of steel plate. The cover plate is used to shield the top of the buffer expansion module and also to shield the upper opening of the notch slot, which effectively improves the protection of the buffer assembly and the rotating leg, and facilitates the operation of the generator module by personnel climbing onto the buffer expansion module.

[0015] As a further improvement to this application, the middle of the panel is provided with a panel window for the buffer assembly to pass through. Space is reserved on both the left and right ends of the panel window for the buffer assembly to move. A cover is fixedly connected to both the left and right ends of the panel window. The buffer assembly extends through the panel window, providing space for the buffer assembly to move. The cover flexibly covers the space for the buffer assembly to move, effectively preventing external debris from entering the buffer expansion module through the panel window.

[0016] As another improvement of this application, the shielding cover is composed of a flexible diaphragm and a rigid diaphragm fixedly stacked together. The flexible diaphragm is fixedly connected to the buffer assembly, and the rigid diaphragm is fixedly connected to the panel window. The shielding cover effectively improves the shielding ability of the shielding cover through the combination of the flexible diaphragm and the rigid diaphragm.

[0017] As a further improvement to this application, both the flexible diaphragm and the rigid diaphragm are arranged in a wavy bend. The flexible diaphragm is made of rubber material, and the rigid diaphragm is made of alloy steel material. An indicator rod is fixedly connected to one end of the rigid diaphragm near the buffer assembly. The wavy bend of the flexible and rigid diaphragms facilitates deformation under pressure. After the rigid diaphragm is deformed under pressure, it will be fixed in the compressed state due to its own characteristics. Thus, the positional change of the indicator rod can be used to determine whether there is overload buffering in the buffer assembly, thereby prompting the staff to inspect the steel main frame in time.

[0018] A topology optimization design method for a foldable and expandable frame structure is proposed. An initial topology optimization model of the steel main frame is established, the initial optimization topology results are obtained, the initial topology optimization results are identified and verified, and the steel main frame design scheme is completed.

[0019] Based on the steel main frame design, a topology optimization model of the expansion combination scheme of buffer expansion module and steel main frame is carried out to obtain the initial combination optimization topology result. The initial combination topology optimization result is identified and verified to complete the combination design scheme of buffer expansion module and steel main frame.

[0020] Based on the optimized topology results of the combination scheme of buffer expansion module and steel main frame, the structural scheme of buffer expansion module is dimensionally optimized to obtain the final optimized topology result of buffer expansion module;

[0021] The method for optimizing the structural parameters of the buffer expansion module includes: dividing the buffer expansion module into models according to functional areas, connecting the models of each functional area together, and optimizing the size parameters of the functional area models in an orderly manner.

[0022] The method for optimizing the size parameters of the functional area model includes: setting an interval for adjusting the size parameters of each functional area model, selecting a specified parameter that increases incrementally within the interval, establishing a relationship between the parameters of related functional area models, and optimizing the size parameters of each functional area model according to the strength of the specified required functions.

[0023] In summary, this invention utilizes a buffer expansion module that is folded and rotated at both ends of a steel main frame. The generator module is slidably connected to the assembly slot via a connecting block. When the steel main frame carries the generator module, the buffer assembly buffers the inertial force of the generator module, effectively improving the installation stability of the generator module and the steel main frame. When the steel main frame is stationary, the buffer expansion module rotates to the side of the steel main frame, forming a triangular stable support state between the buffer expansion module, the steel main frame, and the ground. By contacting the ground with the ground-contacting feet, the buffer assembly provides lateral impact protection for the generator module. Attached Figure Description

[0024] Figure 1 This is a perspective structural diagram of the first embodiment of this application;

[0025] Figure 2 This is a three-dimensional structural diagram of the steel main frame according to the first embodiment of this application;

[0026] Figure 3 This is an enlarged view of the fixing base according to the first embodiment of this application;

[0027] Figure 4 This is a bottom perspective view of the solid connector and assembly block according to the first embodiment of this application.

[0028] Figure 5 This is a cross-sectional perspective view of the buffer expansion module according to the first embodiment of this application;

[0029] Figure 6 This is a demonstration diagram of the buffer expansion module in the outward-rotated state according to the first embodiment of this application;

[0030] Figure 7 This is a top view illustrating the triangular support state of the buffer expansion module according to the first embodiment of this application.

[0031] Figure 8 This is a bottom view illustrating the triangular support state of the buffer expansion module in the first embodiment of this application.

[0032] Figure 9 This is a bottom-view perspective structural diagram of the buffer expansion module according to the first embodiment of this application;

[0033] Figure 10 This is a three-dimensional structural diagram of the rotating support leg according to the first embodiment of this application;

[0034] Figure 11 A perspective structural diagram of the paving panel and buffer expansion module for the second embodiment of this application;

[0035] Figure 12 This is a side cross-sectional view of the panel window according to the second embodiment of this application;

[0036] Figure 13 This is a schematic diagram of the optimized method flow for the third embodiment of this application.

[0037] Explanation of the labels in the diagram:

[0038] 1. Steel main frame; 101. Generator module; 102. Fixing base; 103. Solid plug connector; 104. Alloy bolt; 105. Rotating base; 2. Buffer expansion module; 201. Central shaft; 202. Buffer assembly; 203. Buffer spring; 204. Assembly slot; 205. Assembly block; 206. Ground contact leg; 207. Pin joint; 3. Notch slot; 301. Rotating leg; 302. Universal support; 303. Wheels; 304. Operating lever; 305. Storage slot; 4. Panel; 401. Panel window; 402. Shielding cover; 403. Flexible diaphragm; 404. Rigid diaphragm; 405. Marking bar. Detailed Implementation

[0039] The three embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0040] First implementation method:

[0041] Figures 1 to 4The diagram shows a foldable expandable frame structure and its topology optimization design method, including a steel main frame 1, a generator module 101 mounted on the top of the steel main frame 1, a fixed seat 102 fixedly connected at equal intervals in the middle of the steel main frame 1, and solid plugs 103 fixedly connected at equal intervals at the bottom of the generator module 101. The solid plugs 103 are plugged into the fixed seats 102, and alloy bolts 104 are threaded through the solid plugs 103 and the fixed seats 102.

[0042] During the installation and fixing of the steel main frame 1 and the generator module 101, the solid plug 103 is inserted into the fixing seat 102 to accurately place the generator module 101 on the top of the steel main frame 1. The alloy bolt 104 is threaded through the solid plug 103 and the fixing seat 102 to lock the solid plug 103 and the fixing seat 102. When there is inertial force in the generator module 101, the rigidity of the alloy bolt 104 is used to bear the inertial force. When the effect of the inertial force exceeds the bearing capacity of the alloy bolt 104, the alloy bolt 104 will break to initially offset part of the inertial force.

[0043] Figures 4 to 9 As shown, a rotating seat 105 is rotatably connected to both ends of the steel main frame 1. A buffer expansion module 2 is hinged to the bottom of the rotating seat 105. A central shaft 201 is fixedly connected to the middle of the buffer expansion module 2. A buffer assembly 202 and a buffer spring 203 are movably sleeved on the middle and both ends of the central shaft 201, respectively. The two sets of buffer springs 203 are fixedly connected to the front and rear ends of the buffer assembly 202, respectively. An assembly groove 204 is fixedly opened on the top of the buffer assembly 202. A connecting block 205 is fixedly connected to the bottom of the generator module 101. The connecting block 205 is slidably connected to the assembly groove 204. The bottom of the buffer assembly 202 is fixed. The buffer expansion module 2 is connected to a grounding foot 206, which is slidably connected to the bottom of the buffer expansion module 2. The grounding foot 206 extends from the end of the buffer expansion module 2 away from the rotating seat 105. The buffer expansion module 2 is horizontally aligned with the edge of the steel main frame 1. A pin connector 207 is fixedly connected to the end of the buffer expansion module 2 away from the rotating seat 105. The pin connector 207 is snapped into the steel main frame 1. When the buffer expansion module 2 is rotated and folded to the side edge of the steel main frame 1, the pin connector 207 is used to snap into the steel main frame 1 and the pin is inserted and fixed, thereby effectively improving the stability of the buffer expansion module 2 in the folded state.

[0044] When the steel main frame 1 carries the generator module 101 and a sudden braking occurs, the alloy bolt 104 breaks to initially offset part of the inertial force. The generator module 101 continues to apply inertial force to the buffer assembly 202 through the assembly block 205. The buffer assembly 202 slides on the central shaft 201 to compress the buffer spring 203, thereby buffering the inertial force of the generator module 101 and further offsetting the inertial force, thus effectively improving the installation stability of the generator module 101 and the steel main frame 1.

[0045] When the steel main frame 1 is stationary and the generator module 101 is generating electricity, the buffer extension module 2 rotates to the side of the steel main frame 1 using the rotating seat 105, forming a triangular stable support state between the buffer extension module 2, the steel main frame 1, and the ground. The ground contact foot 206 directly contacts the ground. When the steel main frame 1 is subjected to a side impact, the impact force is transmitted to the buffer assembly 202 through the ground contact foot 206. Similarly, the buffer assembly 202 slides on the central shaft 201 to compress the buffer spring 203, thereby buffering the impact force and effectively improving the stability of the steel main frame 1 in a stationary state.

[0046] Figures 6 to 10 As shown, a notch 3 is provided on the outer side of the end of the buffer expansion module 2 away from the rotating base 105. A rotating support leg 301 is rotatably connected inside the notch 3. The rotating support leg 301 is parallel to the notch 3, and its length corresponds to the height of the buffer expansion module 2 from the ground. The rotating support leg 301 rotates downward in the notch 3, making contact with the ground first, thus facilitating the outward rotation of the buffer expansion module 2. A universal support 302 is rotatably connected to the bottom of the rotating support leg 301, and a wheel 3 is rotatably connected to the bottom of the universal support 302. 03. The universal support 302 and the wheels 303 are used to effectively improve the free movement of the rotating leg 301. The universal support 302 is externally hinged with an operating rod 304. The rotating leg 301 is externally provided with a storage slot 305. The operating rod 304 is engaged with the storage slot 305. The universal support 302 can be manually pulled to rotate by the operating rod 304, which makes it easy for the rotating leg 301 to drive the buffer expansion module 2 to rotate outward. It also makes it easy to manually adjust the wheels 303 to align with the notch slot 3, so that the rotating leg 301 can return to the notch slot 3.

[0047] When the steel main frame 1 is stationary and waiting for the generator module 101 to start generating electricity, the rotating support leg 301 is rotated downward from the notch slot 3, so that the wheel 303 at the bottom of the universal support 302 contacts the ground. This allows the rotating support leg 301 to provide auxiliary support for the rotation of the buffer expansion module 2. After the buffer expansion module 2 rotates until the steel main frame 1 is in a vertical position, the rotating support leg 301 is slowly returned to the notch slot 3, so that the buffer expansion module 2 tilts downward until the ground-touching foot 206 contacts the ground. This completes the triangular stable support state of the buffer expansion module 2, the steel main frame 1, and the ground, effectively improving the rotational switching stability of the buffer expansion module 2.

[0048] Second implementation method:

[0049] Compared to the first implementation, the main addition is a paving panel 4, the specific addition structure is as follows, and the rest of the structure is the same as the first implementation.

[0050] Figure 5 and Figure 11 As shown, a panel 4 is fixedly connected to the top of the buffer expansion module 2, and the upper opening of the notch 3 is fixedly connected to the panel 4. The panel 4 is made of steel plate. The panel 4 is used to cover the top of the buffer expansion module 2 and also to cover the upper opening of the notch 3, which effectively improves the protection of the buffer assembly 202 and the rotating support leg 301, and facilitates the operation of the generator module 101 by the staff on the buffer expansion module 2. The middle of the panel 4 is provided with a panel window 401 for the buffer assembly 202 to pass through. The left and right ends of the panel window 401 are reserved with space for the buffer assembly 202 to move. The left and right ends of the panel window 401 are fixedly connected with a cover 402. The buffer assembly 202 extends through the panel window 401, which provides space for the buffer movement of the buffer assembly 202. The cover 402 flexibly covers the space for the buffer assembly 202 to move, effectively preventing external debris from entering the buffer expansion module 2 through the panel window 401.

[0051] After the buffer expansion module 2 rotates to the side of the steel main frame 1, when the buffer expansion module 2, the steel main frame 1, and the ground are in a triangular stable support state, the top of the buffer expansion module 2 is covered by the cover panel 4, and the buffer assembly 202 extends through the panel window 401 to provide space for the buffer movement of the buffer assembly 202. The cover 402 provides flexible cover for the panel window 401, effectively preventing external debris from falling into the buffer expansion module 2 through the panel window 401. The cover panel 4 covers the upper opening of the notch slot 3, effectively improving the protection of the buffer assembly 202 inside the buffer expansion module 2, effectively improving the protection of the rotating support leg 301 inside the notch slot 3, and making it convenient for workers to climb onto the buffer expansion module 2 to operate the generator module 101.

[0052] Figures 11 to 12 As shown, the shielding cover 402 is formed by the fixed superposition of a flexible diaphragm 403 and a rigid diaphragm 404. The flexible diaphragm 403 is fixedly connected to the buffer assembly 202, and the rigid diaphragm 404 is fixedly connected to the panel window 401. The shielding cover 402 effectively improves the shielding capacity of the shielding cover 402 through the combination of the flexible diaphragm 403 and the rigid diaphragm 404. Both the flexible diaphragm 403 and the rigid diaphragm 404 are wavy and curved. The flexible diaphragm 403 is made of rubber material, and the rigid diaphragm 404 is made of alloy steel material. An indicator rod 405 is fixedly connected to one end of the rigid diaphragm 404 near the buffer assembly 202. The wavy and curved flexible diaphragm 403 and the rigid diaphragm 404 are easy to deform under pressure. After the rigid diaphragm 404 is deformed under pressure, it will be fixed in the compressed state due to its own characteristics. Thus, the position change of the indicator rod 405 can be used to judge whether the buffer assembly 202 is overloaded, thereby prompting the staff to repair the steel main frame 1 in time.

[0053] The shielding cover 402 is formed by the combination of a flexible diaphragm 403 and a rigid diaphragm 404. The flexible diaphragm 403, made of rubber, is easier to deform and recover, effectively improving the shielding capacity of the shielding cover 402. The rigid diaphragm 404 is made of alloy steel. After the rigid diaphragm 404 is deformed by pressure, it will remain in the compressed state due to its own characteristics. This will cause the marking rod 405 on the rigid diaphragm 404 to show obvious positional changes. By observing the positional changes of the marking rod 405, the staff can determine whether the buffer assembly 202 is overloaded, thereby prompting the staff to inspect the steel main frame 1 in a timely manner, effectively improving the timely inspection effect of the steel main frame 1.

[0054] The third implementation method:

[0055] Figure 13 The topology optimization design method for the foldable and scalable frame structure is shown, and is specifically carried out according to the following steps:

[0056] Step 1: Establish an initial topology optimization model for the steel main frame 1. Establish a three-dimensional conceptual model of the steel main frame 1. Based on the design scheme of the steel main frame 1, develop a topology optimization model for the expansion combination scheme of the buffer extension module 2 and the steel main frame 1. Set the material properties, preset operating environment, and threshold conditions for torsional and bending stiffness of the steel main frame 1 and the buffer extension module 2. Perform topology optimization. The multi-constraint settings of OptiStruct software can be used to optimize the combined working conditions. The target requirements under different needs are transformed into constraints. The overall quality score of the topology model is set as the target for optimization, resulting in the initial optimized topology results.

[0057] Step 2: Based on the initial optimization topology results, the parametric model established using the concept scheme of the combined scheme topology optimization model, combined with the design requirements of the buffer expansion module 2 on the steel main frame 1, the parametric model is changed quickly, the force transmission path of the topology optimization is identified, and it is transformed into a practical effective solution based on engineering experience or reference structures. On the basis of existing processes and equipment, the steel main frame 1 and the buffer expansion module 2 can be produced normally and meet the manufacturing process requirements. Finally, the effective solution is selected and implemented in the frame design and production.

[0058] Step 3: Based on the design scheme of steel main frame 1 and buffer expansion module 2, optimize the size and position parameters of steel main frame 1 and buffer expansion module 2, update the design scheme of steel main frame 1 and buffer expansion module 2 completed in step 2 to the parametric model, that is, the type parameters of the geometric shape of the model, establish the parametric assembly relationship between parts through mapping relationship, and divide the functional areas on the combined model of steel main frame 1 and buffer expansion module 2.

[0059] Step 4: Optimize the topology of the parts in each functional area of ​​the combined model of the steel main frame 1 and the buffer expansion module 2 to further improve the related functions and the lightweight of the parts in the functional area. Analyze and optimize the functional strength of the sheet metal parts of each part in the functional area. Use a relatively linear analysis method to correlate the part size with the strength of the function. In order to achieve the strength optimization value of the functional area, identify which parts can be added or removed in size, and optimize the part size parameters in each functional area model.

[0060] In light of current practical needs, the above-described embodiments adopted in this application are not limited to these. Any changes made within the scope of knowledge possessed by those skilled in the art without departing from the concept of this application still fall within the protection scope of this invention.

Claims

1. A foldable, expandable frame structure, characterized in that: The system includes a steel main frame (1), on which a generator module (101) is mounted. A fixed seat (102) is fixedly connected at equal intervals in the middle of the steel main frame (1), and a solid plug (103) is fixedly connected at equal intervals at the bottom of the generator module (101). The solid plug (103) is plugged into the fixed seat (102), and an alloy bolt (104) is threaded through the solid plug (103) and the fixed seat (102). The steel main frame (1) is rotatably connected to the left and right ends of a rotating seat (105). The bottom of the rotating seat (105) is hinged to a buffer expansion module (2). The middle of the buffer expansion module (2) is fixedly connected to a central shaft (201). The middle and both ends of the central shaft (201) are respectively movably fitted with a buffer assembly (202) and a buffer spring (203). The two sets of buffer springs (203) are fixedly connected to the front and rear ends of the buffer assembly (202). The top of the buffer assembly (202) is fixedly provided with an assembly groove (204). The bottom of the generator module (101) is fixedly connected to a connecting block (205). The connecting block (205) is slidably connected to the assembly groove (204). The bottom of the buffer assembly (202) is fixedly connected to a grounding foot (206), which is slidably connected to the bottom of the buffer expansion module (2). The grounding foot (206) extends from the end of the buffer expansion module (2) away from the rotating seat (105). A notch (3) is provided on the outside of the end of the buffer expansion module (2) away from the rotating seat (105). A rotating leg (301) is rotatably connected inside the notch (3). The rotating leg (301) is connected to... The notch (3) is parallel and corresponding, and the length of the rotating support leg (301) corresponds to the height of the buffer expansion module (2) and the ground. The bottom of the rotating support leg (301) is rotatably connected to a universal support (302), and the bottom of the universal support (302) is rotatably connected to a wheel (303). The universal support (302) is hinged to an operating rod (304) on the outside. The rotating support leg (301) is provided with a storage slot (305), and the operating rod (304) is engaged with the storage slot (305).

2. The foldable expandable frame structure according to claim 1, characterized in that: The buffer expansion module (2) corresponds horizontally to the edge of the steel main frame (1), and the end of the buffer expansion module (2) away from the rotating seat (105) is fixedly connected with a pin joint (207), which is snapped into the steel main frame (1).

3. The foldable and expandable frame structure according to claim 1, characterized in that: The top of the buffer expansion module (2) is fixedly connected to the paving panel (4), and the upper opening of the notch (3) is fixedly connected to the paving panel (4). The paving panel (4) is made of steel plate.

4. The foldable expandable frame structure according to claim 3, characterized in that: The middle part of the paving panel (4) is provided with a panel window (401) for the buffer assembly (202) to pass through. Both the left and right ends of the panel window (401) are reserved for the buffer assembly (202) to move, and both the left and right ends of the panel window (401) are fixedly connected with a cover (402).

5. The foldable expandable frame structure according to claim 4, characterized in that: The shielding cover (402) is formed by a flexible diaphragm (403) and a rigid diaphragm (404) fixedly stacked together. The flexible diaphragm (403) is fixedly connected to the buffer assembly (202), and the rigid diaphragm (404) is fixedly connected to the panel window (401).

6. The foldable expandable frame structure according to claim 5, characterized in that: Both the flexible diaphragm (403) and the rigid diaphragm (404) are arranged in a wavy shape. The flexible diaphragm (403) is made of rubber material, and the rigid diaphragm (404) is made of alloy steel material. A marker rod (405) is fixedly connected to one end of the rigid diaphragm (404) near the buffer assembly (202).

7. The topology optimization design method for a foldable and scalable frame structure is applied to the foldable and scalable frame structure described in claim 1, characterized in that: Establish the initial scheme topology optimization model of the steel main frame (1), obtain the initial optimization topology results, identify and verify the initial topology optimization results, and complete the design scheme of the steel main frame (1); Based on the design scheme of the steel main frame (1), a topology optimization model of the expansion combination scheme of the buffer expansion module (2) and the steel main frame (1) is carried out to obtain the initial combination optimization topology result. The initial combination topology optimization result is identified and verified to complete the combination design scheme of the buffer expansion module (2) and the steel main frame (1). Based on the optimized topology results of the combination scheme of buffer expansion module (2) and steel main frame (1), the structural scheme of buffer expansion module (2) is optimized in size to obtain the final optimized topology result of buffer expansion module (2); The method for optimizing the structural parameters of the buffer expansion module (2) includes: dividing the buffer expansion module (2) into models according to functional areas, connecting the models of each functional area together, and optimizing the size parameters of the functional area models in an orderly manner; The method for optimizing the size parameters of the functional area model includes: setting an interval for adjusting the size parameters of each functional area model, selecting a specified parameter that increases incrementally within the interval, establishing a relationship between the parameters of related functional area models, and optimizing the size parameters of each functional area model according to the strength of the specified required functions.

Images