Machine body frame structure with variable perimeter

Abstract

The utility model belongs to the technical field of flexible structure design, and particularly relates to a perimeter-variable fuselage frame structure which comprises sliding groove sections, sliding key sections, corrugated beams, height-variable supporting columns and length-variable supporting rods. The corrugated beams are arranged on the outer sides of the sliding key sections and the sliding groove sections and are provided with wave crest and wave trough structures; the sliding key sections and the sliding groove sections are located on the inner sides of the corrugated beams, arranged at intervals and distributed in a staggered mode. The corrugated beams, the sliding key sections and the sliding groove sections are all of arc-shaped structures, and wave crests and wave troughs of the corrugated beams are arranged in the radial direction of the arc-shaped structures; the sliding key section and the sliding groove section are mutually nested to form an arc-shaped supporting sliding way, and the wave trough of the corrugated beam slides on the arc-shaped supporting sliding way; the height-variable supporting column and the length-variable supporting rod are hinged to the two ends of the sliding key section respectively. The shape of the fuselage can be greatly changed, the large-size fuselage can provide a large space to carry more fuel, and the small-size fuselage is beneficial for reducing flight resistance and improving the fuel utilization rate.

Description

Technical Field

[0001] This application belongs to the field of flexible structure design technology, and specifically relates to a fuselage frame structure with variable perimeter. Background Technology

[0002] Many aircraft performing round-trip flights need to carry as much fuel as possible at launch to extend their range, requiring a relatively large fuselage size. As fuel is consumed and flight speed increases, the drag generated by the large fuselage becomes an additional burden. If the fuselage size could decrease with fuel consumption, flight drag could be reduced and fuel efficiency improved. Currently, research on deformable aircraft structures focuses primarily on wing deformation, with limited research on fuselage deformation. The shape of the fuselage cross-section depends on the fuselage frame, which is typically elliptical or circular, with the arc length increasing further from the center.

[0003] Therefore, how to achieve a variable structure for the fuselage frame is a problem that needs to be solved. Utility Model Content

[0004] The purpose of this application is to provide a variable perimeter fuselage frame structure to address the problem that the drag generated by a large fuselage becomes an additional burden as fuel is continuously consumed.

[0005] The technical solution of this application is: a variable perimeter fuselage frame structure, including a sliding groove section, a sliding key section, a corrugated beam, a variable height support column, and a variable length support rod; the corrugated beam is located on the outside of the sliding key section and the sliding groove section, and the corrugated beam has a crest and trough structure; the sliding key section and the sliding groove section are located on the inside of the corrugated beam and are spaced apart, and the sliding key section and the sliding groove section are staggered; the corrugated beam, the sliding key section, and the sliding groove section are all arc-shaped structures, and the crests and troughs of the corrugated beam are arranged along the radial direction of the arc-shaped structure;

[0006] The keyway section and the groove section are nested together to form an arc-shaped support slide. The trough of the corrugated beam slides on the arc-shaped support slide. The variable height support column and the variable length support rod are respectively hinged to both ends of the groove section. The variable height support column and the variable length support rod can be height adjusted in the radial direction of the arc-shaped support slide.

[0007] The variable-height support column includes an outer shell, a series of butterfly-shaped flexible devices, and a drive device. The outer shell is hexagonal with a hollow interior and an open top. Both the series of butterfly-shaped flexible devices and the drive device are located inside the outer shell. The series of butterfly-shaped flexible devices includes multiple sets of vertically stacked flexible plates, each with a central hole. The flexible plates are coaxially aligned with the outer shell. The drive device is coaxially aligned with the outer shell, with its upper end extending from the top opening and its middle section inserted into the center of the flexible plate. The outer shell includes multiple sections of column, arranged vertically, with adjacent sections nested and slidingly fitted. The outer end of the drive device is hinged to a sliding groove section, and its inner end is fixedly connected to the basic structure of the fuselage.

[0008] One end of the variable-length support rod is hinged to the slide section, and the other end is hinged to the basic structure of the machine body. The length of the variable-length support rod is adjusted so that the two ends of each slide section are on the same arched contour line.

[0009] Preferably, the cross-section of the sliding key segment is dovetail-shaped, and the middle of the sliding groove segment is provided with a dovetail groove that mates with the sliding key segment; both the upper bottom surfaces of the sliding key segment and the sliding groove segment are provided with reinforcing ribs.

[0010] Preferably, the reinforcing ribs of the keyway section and the groove section are distributed in the middle and on both sides, respectively, and the upper bottom surfaces of the keyway section and the groove section are on the same plane, forming a support rail that can slide with the corrugated beam; the troughs of the corrugated beam are provided with support pulleys at the positions corresponding to the support rails; each trough of the corrugated beam slides on the support rail through the support pulleys.

[0011] Preferably, the supporting pulley includes a pulley seat and sliding rollers. There are three sets of sliding rollers, each corresponding to one of the three sets of reinforcing ribs. Adjacent sliding rollers are connected by axles. The middle sliding roller is correspondingly arranged with the supporting slide rail on the keyway. The upper end of the pulley seat is bolted to the corrugated beam, and the lower end is slidably engaged with the axle of the sliding roller.

[0012] Preferably, the arc-shaped support slide includes 4 sliding groove segments and 3 sliding key segments. The length of the sliding groove segment is L, and the length of the sliding key segment is 1.5 times the length of the sliding groove segment. Each sliding key segment is nested by two adjacent sliding groove segments for 0.5L, and the length not nested in the sliding groove segment is 0.5L.

[0013] Preferably, the flexible plate includes a first sector block and a second sector block; there are multiple sets of both the first sector block and the second sector block, which are staggered to form a ring structure; the cross-section of both the first sector block and the second sector block is a V-shaped structure, and the opening faces away from the center of the ring structure; the first sector block and the second sector block are bent in opposite directions, and the first sector block and the second sector block that are close to each other on adjacent flexible plates are welded together at the welding area to form a butterfly shape that is interlocked; then the second sector block is welded together with the first sector block that is close to each other on the next adjacent flexible plate to form a series disc-shaped flexible device.

[0014] Preferably, the diameter of the central circular hole of the flexible plate is larger than the diameter of the displacement output rod of the driving device, the end of the lowermost column sidewall is fixedly connected to the foundation structure, the top of the uppermost column sidewall is fixedly connected to the series butterfly flexible device and the driving device, and a connecting joint is provided at the top.

[0015] The variable perimeter fuselage frame structure of this application allows for significant changes in the shape of the fuselage. A larger fuselage provides more space to carry more fuel, while a smaller fuselage helps reduce flight drag and improve fuel efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions provided in this application, the accompanying drawings will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application.

[0017] Figure 1 This is a schematic diagram of the overall structure of this application;

[0018] Figure 2 This is a schematic diagram of the fit between the corrugated beam and the groove and key sections of this application;

[0019] Figure 3 This is an exploded sectional view of the slide section and the keyway section of this application;

[0020] Figure 4 This is a sectional view of the connection structure between the slide section and the key section in this application;

[0021] Figure 5 This is a schematic diagram of the connection structure between the supporting pulley and the corrugated beam in this application;

[0022] Figure 6 This is a schematic diagram of the pulley connection structure supporting this application;

[0023] Figure 7 This is a schematic diagram of the overall structure of this application;

[0024] Figure 8 This is a front view of the tandem butterfly-shaped flexible device of this application;

[0025] Figure 9 This is a side view of the tandem butterfly-shaped flexible device of this application.

[0026] 1. Slide section; 2. Keyway section; 3. Corrugated beam; 4. Variable height support column; 5. Variable length support rod; 6. Support slide rail; 7. Support pulley; 8. Pulley seat; 9. Sliding roller; 10. Wheel axle; 11. Fork lug; 12. Outer shell; 13. Series butterfly flexible device; 14. Drive device; 15. First sector block; 16. Second sector block; 17. Column. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] A variable perimeter fuselage frame structure, such as Figures 1-3 It includes a sliding section 1, a sliding key section 2, a corrugated beam 3, a variable height support column 4, and a variable length support rod 5; the corrugated beam 3 is located on the outside of the sliding key section 2 and the sliding section 1, and the corrugated beam 3 has a crest and trough structure; the sliding key section 2 and the sliding key section 1 are located on the inside of the corrugated beam 3, and are spaced apart, with the sliding key section 2 and the sliding key section 1 being staggered; the corrugated beam 3, the sliding key section 2, and the sliding key section 1 are all arc-shaped structures, and the crests and troughs of the corrugated beam 3 are arranged along the radial direction of the arc-shaped structure;

[0029] The sliding key section 2 and the sliding groove section 1 are nested together to form an arc-shaped support slide. The trough of the corrugated beam 3 slides on the arc-shaped support slide. The variable height support column 4 and the variable length support rod 5 are respectively hinged to the two ends of the sliding groove section 1. Both the variable height support column 4 and the variable length support rod 5 can be height adjusted in the radial direction of the arc-shaped support slide.

[0030] The variable height support column 4 includes a shell 12, a series of butterfly-shaped flexible devices 13, and a drive device 14. The shell 12 is a regular hexagon with a hollow internal structure and an open top. The series of butterfly-shaped flexible devices 13 and the drive device 14 are both located inside the shell 12. The series of butterfly-shaped flexible devices 13 includes multiple sets of flexible plates stacked vertically. A circular hole is opened in the center of each flexible plate. The flexible plates are coaxially arranged with the shell 12. The drive device 14 is coaxially arranged with the shell 12. The upper end of the drive device 14 extends out from the top opening of the shell 12 and the middle part is inserted into the center of the flexible plate. The shell 12 includes multiple sections of column 17, which are arranged vertically. Adjacent sections of column 17 are nested and slidably fitted together. The outer end of the drive device 14 is hinged to the sliding groove section 1, and the inner end is fixedly connected to the basic structure of the fuselage.

[0031] One end of the variable length support rod 5 is hinged to the slide section 1, and the other end is hinged to the basic structure of the machine body. Adjust the length of the variable length support rod 5 so that the two ends of each slide section 1 are on the same arched profile line.

[0032] The variable length support rod 5 is a nested telescopic structure, driven by hydraulics, and does not provide lateral support stiffness. The axial direction of the variable length support rod 5 can be changed when it is extended, which is an existing design.

[0033] When the shape and arc length of the arch beam change, the variable-height support column 4 and the variable-length support rod 5 will automatically change their height, thereby causing the sliding key section 2 and the sliding groove section 1 to slide relative to each other. At the same time, the corrugated beam 3 evenly distributes the change in arc length between adjacent crests, so that the external load is evenly distributed on the arch beam. This allows the arch height and arc length of the arch beam to be changed, better adapting to the needs of structural shape changes, and ensuring that the external load is evenly distributed on the arch beam.

[0034] The variable height support column 4 and the variable length support rod 5 can preferably be an actuator or an electric push rod. When the arch beam deforms outward, the sliding key section 2 and the sliding groove section 1 move away from each other; when the arch beam deforms inward, the sliding key section 2 and the sliding groove section 1 move closer to each other; thus, the arc length changes, so that the fuselage size decreases accordingly with fuel consumption.

[0035] When the height of the support column needs to be adjusted, the multi-section column 17 is driven up and down by the drive device 14. At the same time, the flexible plate expands or contracts under the action of the drive device 14, thereby realizing the height adjustment of the support column. The structure is simple and the control is stable. In addition, the variable height support column has sufficient lateral stiffness to resist lateral loads and torsional loads during the height change process, and the process is simple and easy to implement.

[0036] The above design allows for significant changes in the shape of the fuselage. A larger fuselage provides more space to carry more fuel, while a smaller fuselage helps reduce flight drag and improve fuel efficiency.

[0037] like Figures 4-5 Preferably, the cross-section of the key section 2 is dovetail-shaped, and the middle of the groove section 1 is provided with a dovetail groove that mates with the key section 2; both the key section 2 and the groove section 1 have reinforcing ribs on their upper bottom surfaces to improve strength. The two sides of the dovetail are connected at the exact middle position along the length of the groove section 1. It is necessary to control the cross-sectional stiffness of the groove section 1 and the key section 2 so that a certain amount of elastic deformation can occur during the shape change of the arch beam, such as by using aluminum alloy, to ensure smooth sliding between the groove section 1 and the key section 2.

[0038] The corrugated beam 3 is formed by bending a long strip of metal plate. The crests and troughs of the corrugated beam 3 have similar structures, and its length is variable. The reinforcing ribs of the key section 2 and the groove section 1 are distributed in the middle and on both sides, respectively. The upper surfaces of the key section 2 and the groove section 1 are on the same plane, forming a support rail 6 that can slide with the corrugated beam 3. Support pulleys 7 are provided at the positions of the troughs of the corrugated beam 3 corresponding to the support rail 6. Each trough of the corrugated beam 3 slides on the support rail 6 through the support pulleys 7. The corrugated beam 3 evenly distributes the change in arc length of the arc-shaped support rail 6 to the arc surface formed by the crests. The arc length on the crest surface deforms uniformly, and the out-of-plane load of the variable arc length arched beam is evenly distributed on the arched beam.

[0039] like Figures 6-7 Preferably, the supporting pulley 7 includes a pulley seat 8 and sliding rollers 9. There are three sets of sliding rollers 9, each corresponding to a set of reinforcing ribs. Adjacent sliding rollers 9 are connected by axles 10. The middle sliding roller 9 is correspondingly positioned with the supporting slide rail 6 on the keyway section 2. The upper end of the pulley seat 8 is bolted to the corrugated beam 3, and the lower end is slidably engaged with the axle 10 of the sliding rollers 9. When the position of the corrugated beam 3 changes, the position of the pulley seat 8 changes, thereby driving the three sets of sliding rollers 9 to slide on the keyway section 2 and the groove section 1 via the axle 10, achieving a uniform change in arc length.

[0040] Preferably, the lower end of the pulley seat 8 is provided with a fork lug 11, and a notch is opened on the fork lug 11, which is connected to the wheel axle 10; and the length of the upper end of the pulley seat 8 is slightly greater than the width of the corrugated beam 3, and the width is slightly greater than the diameter of the sliding roller 9; the arc end face of the fork lug 11 has a certain gap with the upper surface of the sliding groove section 1 or the sliding key section 2, and is lower than the upper surface of the sliding groove section 1 and the sliding key section 2, so as to ensure smooth cooperation between the corrugated beam 3 and the sliding key section 2 and the sliding groove section 1.

[0041] Preferably, the arc-shaped support slide includes four sliding groove sections 1 and three sliding key sections 2. The length of the sliding groove section 1 is L, and the length of the sliding key section 2 is 1.5 times the length of the sliding groove section 1. Each sliding key section 2 is nested by two adjacent sliding groove sections 1 for 0.5L, and the length not nested in the sliding groove section 1 is 0.5L. When deformed to the maximum arc length, each sliding key section 2 slides out of the sliding groove section 1 by 0.3L, and the end of the sliding key section 2 overlaps with the sliding groove section 1 by 0.2L.

[0042] Two variable-height support columns 4 support one end of two sliding sections 1 nested within a middle sliding key section 2. The other ends of these two sliding sections 1 are supported by variable-length support rods 5. When the variable-height support columns 4 extend to their maximum length, the middle sliding key section 2 slides out 0.3L from each of the two sliding sections 1. The upper end of the variable-height support column 4 is hinged to the sliding section 1, and the lower end is fixed to the foundation structure. Two other sliding sections 1 are supported at one end by variable-length support rods 5, and the other end is fixed to the foundation structure. The upper end of the variable-height support rods 5 is hinged to the sliding section 1, and the lower end is hinged to the foundation structure. There are a total of four variable-length support rods 5. The length of the variable-length support rods 5 is adjusted so that the two ends of each sliding section 1 are on the contour line of the changing arch.

[0043] like Figures 8-9 Preferably, the flexible plate includes a first sector block 15 and a second sector block 16; there are multiple sets of the first sector block 15 and the second sector block 16, which are staggered to form a ring structure; the cross-section of the first sector block 15 and the second sector block 16 is a V-shaped structure, and the opening faces away from the center of the ring structure; the first sector block 15 and the second sector block 16 are bent in opposite directions, that is, the first sector block 15 is bent in the forward direction and the second sector block 16 is bent in the reverse direction, forming a welding area on the outer side. At the welding area, the first sector blocks 15 and the second sector blocks 16 on adjacent flexible plates that are close to each other are welded together to form a butterfly shape that is interlocked; then the second sector block 16 is welded to the first sector block 15 of the next adjacent flexible plate that is close to each other to form a series of disc-shaped flexible devices.

[0044] The number of flexible plates in the series butterfly-shaped flexible device 13 depends on the initial height of the support column and the travel of the variable height. The initial bending shape of the odd and even sector regions on the flexible plates is the spacing between the flexible plates, and the sum of the spacings should be equivalent to the initial height. The travel of the variable height is the sum of the elastic deformations of all sector regions of the flexible plates. The number of flexible plates is determined according to the travel requirements of the variable height, and the initial bending shape of the flexible plates is adjusted.

[0045] The above design makes the series butterfly flexible device 13 easily deformable in the axial direction of the column 17, and has great stiffness in the lateral and torsional directions, resisting lateral loads and lateral displacements.

[0046] Preferably, the diameter of the central circular hole of the flexible plate is larger than the diameter of the displacement output rod of the drive device 14, the end of the side wall of the lowest column 17 is fixedly connected to the foundation structure, the top of the side wall of the uppermost column 17 is fixedly connected to the series butterfly flexible device 13 and the drive device 14, and a connecting joint is provided at the top.

[0047] During the height change of the support column, each column 17 sidewall and the sidewall of the outer nested column 17 always have a nesting length; the diameter of the flexible plate of the series butterfly flexible device 13 corresponding to the sidewall of different columns 17 can be appropriately adjusted according to the diameter of the inscribed circle of the sidewall of the column 17.

[0048] Preferably, the flexible plate is a 1.5 mm thick, 90 mm diameter circular aluminum plate. The diameter of the circular hole at the center of the flexible plate is 15 mm, the diameter of the middle circular plate is 40 mm, and the outer edge of the plate is divided into 12 sector-shaped areas. The spacing between adjacent flexible plates is 10 mm. The equivalent deflection of the elastic bending of the sector-shaped area of ​​the flexible plate is no more than 10°. The maximum elastic bending of a single flexible plate in both directions can reach 8 mm, and the variable height stroke can meet the requirement of 300 mm.

[0049] Preferably, the diameter of the displacement output rod of the drive device 14 is no more than 15 mm. The drive device 14 adopts a hydraulic actuator or an electric push rod, which passes through the round hole of the series butterfly flexible device 13. The drive device 143 is connected to the series butterfly flexible device 13 and the side wall of the column 17 at the top.

[0050] The column 17 consists of three sections, each with a 2 mm thick, 300 mm long, hexagonal tube wall. The inner diameter of the uppermost hexagonal tube is 92 mm. Initially, the uppermost section has a height of 400 mm, the middle section has a height of 350 mm, and the lowermost section has a height of 300 mm. At its maximum height, the uppermost section has a height of 700 mm, the middle section has a height of 500 mm, and the nesting section between the sections is 100 mm long. The bottom end of the side wall of the lowermost column 17 is fixedly connected to the lowermost series-connected butterfly-shaped flexible device 13.

[0051] In a specific example, the shape of the small fuselage frame is approximately arc-shaped, with a central angle of 70° and a radius of curvature R of 1.35 meters. The arc-shaped support slide of the deformable arched beam is raised to form a new arc shape, constituting the shape of the large fuselage frame. The highest point in the middle of the arch is 0.35 meters higher than the corresponding point of the small fuselage frame. The arc-shaped support slide consists of 4 slide groove segments 1 and 3 slide key segments 2. The length L of a single slide groove segment 1 is 0.3 meters, and the length 1.5L of a slide key segment 2 is 0.45 meters, corresponding to an arc length of 5.5L (1.65 meters) for the small fuselage. When deformed into the shape of the large fuselage frame, each slide key segment 2 slides out 0.3L from each of the two adjacent slide grooves, and the total arc length becomes 7.3L (2.19 meters). The arc length of other intermediate states varies according to the length of the slide key sliding out of the slide groove proportionally.

[0052] First press Figure 1The basic fuselage structure of the deformable fuselage frame is arranged, and support points for variable-length support rods 5 and variable-height support columns 4 are set on the basic fuselage structure. Appropriate space is reserved according to the deformation stroke of the variable-height support columns 4 and variable-length support rods 5. Then, the arc-shaped support slide of the deformable arched beam is arranged. The arc-shaped support slide consists of four 0.3-meter-long sliding groove sections 1 and three 0.44-meter-long sliding key sections 2. When the fuselage size is small, the two ends of the sliding key sections 2 are nested in the adjacent sliding groove sections 1 for 0.145 meters respectively, and the unnested length is 0.15 meters. The arc-shaped support slide is 1.65 meters long.

[0053] The sliding key section 2 is 0.44 meters long and has a trapezoidal cross-section. The cross-sectional shape is as follows: Figure 2 The upper bottom is 15 mm wide, the lower bottom is 25 mm wide, and the height is 20 mm. The slide section 1 is 0.3 m long and matches the cross-section of the slide key section 2. Its bottom edge is 45 mm wide and 30 mm high, and it is machined using sheet metal or profiles, with the bottom edge closed. A 10 mm wide strip connects the two sides of the dovetail groove at the very center of the slide section 1 along its length (0.15 m from the end). The slide key section 2 has a slide height of 5 mm and a width of 10 mm, while the slide section 1 has a slide height of 5 mm and a width of 8 mm, and their positions match the sliding roller 9. The cross-sectional stiffness of the slide section 1 and slide key section 2 needs to be controlled to allow for a certain degree of elastic deformation during changes in the shape of the machine frame.

[0054] The corrugated beam 3 is made of a 2 mm thick and 15 mm wide steel strip, forming a continuous sine wave with a wave height of 15 mm and a wavelength of 20 mm, with a total length of 1.65 meters. The corrugated beam 3 slides on the support track via the support pulley 7. The support pulley 7 mainly includes the support pulley 7 seat and the sliding roller 9 (see...). Figure 2 The sliding roller 9 has a diameter of 10 mm, a middle section roller length of 12 mm, and two side sections roller lengths of 9 mm. The diameter of the two intermediate shafts is 3 mm, and they are machined from a 40 mm long and 10 mm diameter cylinder. The support pulley 7 is 20 mm long and 13 mm wide. The fork lug 11 has a height of 12 mm from its axis to its upper end face. The fork lug 11 has a 3 mm notch that matches the shaft of the sliding roller 9. The fork lug 11 is 3 mm thick, and the gap between the arc end face of the fork lug 11 and the upper surface of the slide groove section 1 (slide key section 2) is 3 mm. The corrugated beam 3 is connected to the support pulley 7 with M3 screws.

[0055] according to Figure 1Variable-length support rods 5 and variable-height support columns 4 are arranged between the basic fuselage structure and the chute section 1 of the arc-shaped support slide. Four variable-length support rods 5 are used, with one end of each rod hinged to one end of the chute section 1 and the other end hinged to the corresponding position on the basic fuselage structure. The angles between the axis of the support rod and the line connecting the highest point of the arc center of the support slide to the center of the arc curvature are ±16.25° and ±22.75°, respectively. Two variable-height support columns 4 are used to support the two chute sections 1 nested with the middle sliding key section 2. One end of each support column is hinged to one end of the chute section 1 and the other end is fixed to the corresponding position on the basic fuselage structure. When the support column is raised along the axis to lift the arc-shaped support slide to its highest position (0.35 meters), the middle sliding key section 2 slides out 0.3L (0.09 meters) from the adjacent chute section 1.

[0056] The variable-height support column consists of three nested regular hexagonal tubes as its sidewalls, with a wall thickness of 2 mm. The inner diameter of the inner circle of the uppermost section is 92 mm, and the end of the lowermost section is fixed to the base structure. A series of flexible disc-shaped devices are installed in the middle of the tube walls (see...). Figure 3 The drive unit 14 passes through the central hole of the series-connected disc-shaped flexible device. The flexible plate of the series-connected disc-shaped flexible device is a circular aluminum plate 1.5 mm thick and 90 mm in diameter. The diameter of the circular hole at the center of the flexible plate is 15 mm; the diameter of the middle circular plate is 40 mm, and the outer edge of the plate is divided into 12 fan-shaped areas. The initial bending shape of the flexible plate is shown in [reference needed]. Figure 4 The spacing between adjacent flexible plates is 10 mm, and the outermost welding area is 3 mm wide; there are a total of 45 flexible plates, the equivalent deflection of the elastic bending of the fan-shaped area of ​​the flexible plate is no more than 10°, the maximum elastic bending of a single flexible plate in two directions can reach 8 mm, and the variable height stroke can meet the requirement of 350 mm.

[0057] A hydraulic actuator or an electric push rod is used as the driving device 14. The diameter of the displacement output rod of the driving device 14 is no more than 15 mm. The end of the side wall of the lowest column 17 is fixedly connected to the foundation structure. The top of the side wall of the uppermost column 17 is fixedly connected to the series butterfly flexible device 13 and the driving device 14. The connecting joint at the top is hinged to the end of the slide section 1.

[0058] Finally, it should be noted that the accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

[0059] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A fuselage frame structure with variable perimeter, characterized in that: It includes a sliding groove section (1), a sliding key section (2), a corrugated beam (3), a variable height support column (4), and a variable length support rod (5); the corrugated beam (3) is located outside the sliding key section (2) and the sliding groove section (1), and the corrugated beam (3) has a crest and a trough structure; the sliding key section (2) and the sliding groove section (1) are located inside the corrugated beam (3) and are spaced apart, and the sliding key section (2) and the sliding groove section (1) are staggered; the corrugated beam (3), the sliding key section (2), and the sliding groove section (1) are all arc-shaped structures, and the crests and troughs of the corrugated beam (3) are arranged along the radial direction of the arc-shaped structure; The sliding key section (2) and the sliding groove section (1) are nested together to form an arc-shaped support slide. The trough of the corrugated beam (3) slides on the arc-shaped support slide. The variable height support column (4) and the variable length support rod (5) are respectively hinged to the two ends of the sliding groove section (1). The variable height support column (4) and the variable length support rod (5) can both be height adjusted in the radial direction of the arc-shaped support slide. The variable height support column (4) includes a shell (12), a series of butterfly-shaped flexible devices (13), and a drive device (14). The shell (12) is a regular hexagon with a hollow structure inside and an open top. The series of butterfly-shaped flexible devices (13) and the drive device (14) are both located inside the shell (12). The series of butterfly-shaped flexible devices (13) includes multiple sets of flexible plates stacked vertically. A circular hole is opened in the center of each flexible plate. The flexible plate is coaxially arranged with the shell (12). The drive device (14) is coaxially arranged with the shell (12). The upper end of the drive device (14) extends from the top opening of the shell (12) and is inserted into the center of the flexible plate. The shell (12) includes multiple sections of column (17). The multiple sections of column (17) are arranged vertically, and adjacent sections of column (17) are nested and slidably fitted together. The outer end of the drive device (14) is hinged to the sliding groove section (1), and the inner end is fixedly connected to the basic structure of the fuselage. One end of the variable length support rod (5) is hinged to the slide section (1), and the other end is hinged to the basic structure of the machine body. Adjust the length of the variable length support rod (5) so that the two ends of each slide section (1) are on the same arched contour line.

2. The variable perimeter fuselage frame structure as described in claim 1, characterized in that: The cross-section of the sliding key section (2) is dovetail-shaped, and the middle part of the sliding groove section (1) is provided with a dovetail groove that matches the sliding key section (2); both the upper bottom surfaces of the sliding key section (2) and the sliding groove section (1) are provided with reinforcing ribs.

3. The variable perimeter fuselage frame structure as described in claim 2, characterized in that: The reinforcing ribs of the key section (2) and the groove section (1) are distributed in the middle and on both sides respectively. The upper bottom surfaces of the key section (2) and the groove section (1) are on the same plane, forming a support slide rail (6) that can slide with the corrugated beam (3). The troughs of the corrugated beam (3) are provided with support pulleys (7) at the positions corresponding to the support slide rail (6). Each trough of the corrugated beam (3) slides on the support slide rail (6) through the support pulleys (7).

4. The variable perimeter fuselage frame structure as described in claim 3, characterized in that: The supporting pulley (7) includes a pulley seat (8) and a sliding roller (9). There are three sets of sliding rollers (9) and three sets of reinforcing ribs respectively. A wheel axle (10) connects adjacent sliding rollers (9). The middle sliding roller (9) is correspondingly set with the supporting slide rail (6) on the keyway section (2). The upper end of the pulley seat (8) is bolted to the corrugated beam (3), and the lower end is slidably engaged with the wheel axle (10) of the sliding roller (9).

5. The variable perimeter fuselage frame structure as described in claim 2, characterized in that: The arc-shaped support slide includes 4 sliding groove sections and 3 sliding key sections. The length of each sliding groove section is L, and the length of each sliding key section is 1.5 times the length of the sliding groove section. Each sliding key section is nested by two adjacent sliding groove sections for 0.5L, and the length not nested in the sliding groove section is 0.5L.

6. The variable perimeter fuselage frame structure as described in claim 1, characterized in that: The flexible plate includes a first sector block (15) and a second sector block (16); there are multiple sets of the first sector block (15) and the second sector block (16), which are staggered to form a ring structure; the cross-section of the first sector block (15) and the second sector block (16) is a V-shaped structure, and the opening faces away from the center of the ring structure; the first sector block (15) and the second sector block (16) are bent in opposite directions, and the first sector block (15) and the second sector block (16) of adjacent flexible plates are welded together at the welding area to form a butterfly shape that is interlocked; then the second sector block (16) is welded together with the first sector block (15) of the next adjacent flexible plate to form a series of disc-shaped flexible devices.

7. The variable perimeter fuselage frame structure as described in claim 1, characterized in that: The diameter of the central circular hole of the flexible plate is larger than the diameter of the displacement output rod of the driving device (14). The end of the side wall of the lowest column (17) is fixedly connected to the foundation structure, and the top of the side wall of the uppermost column (17) is fixedly connected to the series butterfly flexible device (13) and the driving device (14). A connecting joint is provided at the top.

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