Grating-based composite thin-wall tubular extension arm and manufacturing method and equipment thereof

Abstract

The invention provides a grid-based composite thin-wall tubular extension arm and a manufacturing method and equipment thereof, and the grid-based composite thin-wall tubular extension arm comprises two grid belts which are symmetrically arranged up and down; the manufacturing method of the composite thin-wall tubular extension arm based on the grating comprises the following steps that firstly, the distance between the first 3D printing nozzle and the second 3D printing nozzle is adjusted; 2, conveying the molten continuous fiber composite material; thirdly, the multiple first 3D printing nozzles and the multiple second 3D printing nozzles work at the same time; fourthly, the movable printing component and the fixed printing component are subjected to height adjustment; (5) the grating belt is wound; sixthly, the composite thin-wall tubular extension arm is obtained through preparation; the manufacturing equipment of the composite thin-wall tubular extension arm based on the grating comprises a rack and a hot press molding mechanism, the multiple first 3D printing nozzles and the multiple second 3D printing nozzles are adopted for working at the same time, and continuous printing of the grating belt is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of manufacturing of tubular extension arms, and particularly to a grid-based composite thin-walled tubular extension arm and its manufacturing method and equipment. Background Art

[0002] Continuous fiber reinforced composites have become ideal structural materials in fields such as aerospace, automotive manufacturing, and high-end sports equipment due to their excellent specific strength, specific stiffness, and lightweight characteristics. Compared with traditional metal materials, continuous fiber composites can significantly reduce the structural weight while ensuring high strength, which gives them irreplaceable advantages in application scenarios where weight reduction and efficiency improvement are required. In recent years, with the rapid development of 3D printing technology, continuous fiber composite additive manufacturing technology has emerged. It perfectly combines the excellent mechanical properties of continuous fibers with the unique advantages of 3D printing in complex structure forming. Researchers have used pre-impregnated fiber filaments as raw materials and successfully achieved the manufacturing of complex structures with multiple functions, lightweight, and excellent mechanical properties, such as various grids, honeycombs, and curved strengthening structures.

[0003] Traditional space extension arms have complex structures, large masses, and low stowage ratios. Thin-walled tubular extension arms use electric motors for winding and elastic potential energy to achieve stowage and deployment, and at the same time have advantages such as small mass and high stability. They are one of the most promising space extension arms as solar sail support rods. Currently, space extension arms are gradually developing towards multi-functional (bending, supporting, sensing), lightweight (carbon fiber composites, gridification), and adaptive (responding to changing space environments). However, the contradictory requirements of the bending resistance, axial compressive bearing capacity, and curling and stowage capabilities of thin-walled tubular extension arms for structural stiffness have always been the key issues in the design of thin-walled tubular extension arms.

[0004] In recent years, the grid structure has been a research hotspot and can achieve lightweight and energy absorption. It has currently been applied in the aerospace and automotive industries. Among them, the composite grid structure has high specific stiffness and specific strength. With the continuous improvement of the requirements for solar sail launch and navigation conditions, the grid structure provides a new design idea for realizing multi-directional stiffness adjustment of thin-walled tubular extension arms.

[0005] However, due to the complex structure, it is difficult to manufacture the grid structure by traditional machining, welding and other technologies. 3D printing technology, such as fused deposition modeling (FDM), provides a new solution for the integrated molding of composite material grid structures. The 3D printing of continuous fiber reinforced composite polymers (CFRC), as an innovative technology, perfectly combines the manufacturing advantages of 3D printing and the mechanical property advantages of continuous fiber reinforced composite materials (CFRC). However, in the face of thin-walled tubular extension arms with a length of more than ten meters or even more than one hundred meters, traditional 3D printing devices expose many problems: First, the single nozzle needs to lay fibers row by row and layer by layer, and the printing of large-size pod rod grid structures takes an extremely long time, and the production efficiency is difficult to meet the requirements of industrial large-scale production; Second, limited by the movement stroke of the single nozzle, traditional FDM equipment has difficulties in manufacturing ultra-long fiber grid structures, which greatly restricts the application of this technology in the manufacturing of large thin-walled tubular extension arm structural parts; Third, in order to enable the thin-walled tubular extension arm of the grid structure to obtain the best mechanical properties, multi-directional fiber co-reinforcement is often required. However, when the single nozzle switches the fiber paths at different angles, it is easy to reduce the accuracy of the fiber intersection points and affect the load-bearing capacity of the overall structure.

[0006] Moreover, when the existing technology prints the grid structure and forms the thin-walled tubular extension arm, it is difficult to achieve continuous manufacturing. Therefore, it is necessary to provide a continuous fiber composite grid structure thin-walled tubular extension arm and a continuous manufacturing method to solve the above technical problems. Summary of the Invention

[0007] To solve the above technical problems, the present invention provides a grid-based composite thin-walled tubular extension arm, its manufacturing method and equipment.

[0008] A grid-based composite thin-walled tubular extension arm provided by the present invention includes two grid belts arranged symmetrically up and down. A convex arc portion is provided in the middle of the grid belt, concave arc portions are provided on both sides of the convex arc portion, and a straight portion is provided on one side of the concave arc portion. The grid belt includes a plurality of straight grid bars and inclined grid bars.

[0009] Preferably, the present invention also provides a manufacturing method for a grid-based composite thin-walled tubular extension arm, and the method steps are as follows:

[0010] Step 1: Adjust the spacing between adjacent first 3D printing nozzles and the spacing between adjacent second 3D printing nozzles;

[0011] Step 2: Feed the melted continuous fiber composite material to the first 3D printing nozzle and the second 3D printing nozzle;

[0012] Step 3: The second 3D printing nozzle moves with the platen to extrude continuous fiber composite material to form straight grid bars on the platen. The moving direction of the first 3D printing nozzle is perpendicular to the moving direction of the platen and reciprocates to print inclined grid bars. Multiple first 3D printing nozzles and multiple second 3D printing nozzles operate simultaneously.

[0013] Step 4: The telescopic end of the lifting electric cylinder expands and contracts to drive the lifting frame to slide on the sliding sleeve, so that the moving printing component and the fixed printing component are synchronously adjusted in height.

[0014] Step 6: The winding motor drives the winding roller to rotate to wind the printed grid belt.

[0015] Step 9: The two wound grid belts are hot-pressed and formed by the hot-pressing forming mechanism to obtain the final composite thin-walled tubular extension arm.

[0016] Preferably, the present invention also provides a manufacturing device for a composite thin-walled tubular extension arm based on a grid: including a frame and a hot-pressing forming mechanism. The bottom of the frame is fixedly connected with a support frame. The wall of the support frame is fixedly installed with a lifting electric cylinder. The telescopic end of the lifting electric cylinder is fixedly connected with a lifting frame. A platen is arranged above the frame. Four sliding sleeves are symmetrically and fixedly connected to the outside of the frame. The lifting frame is slidably connected to the four sliding sleeves. One side of the upper part of the lifting frame is rotatably connected with a first horizontal threaded rod. One side of the upper part of the lifting frame is fixedly connected with a horizontal sliding rod. A second motor is fixedly installed on the wall of the lifting frame. One end of the first horizontal threaded rod passes through the lifting frame and is fixedly connected with the rotating end of the second motor. A moving mechanism is installed on the horizontal sliding rod. A moving printing component is installed under the moving mechanism. A fixed printing component is installed on the wall of the lifting frame. The moving mechanism is used to guide the moving printing component to linearly move along the axial direction of the horizontal sliding rod.

[0017] Preferably, the moving mechanism includes a slider and a vertical shaft. The slider is slidably sleeved on the horizontal sliding rod. The slider is threadedly sleeved on the first horizontal threaded rod. The top end of the vertical shaft is fixedly connected with the bottom of the slider.

[0018] Preferably, the moving printing component includes a first horizontal frame. The first horizontal frame is fixedly connected to the bottom end of the vertical shaft. A first long slot is horizontally penetrated on the first horizontal frame. A number of first Z-shaped mounting seats are equidistantly arranged on the first horizontal frame. A first 3D printing nozzle is fixedly installed on the first Z-shaped mounting seat. A first threaded rod is fixedly connected to the back of the first Z-shaped mounting seat. One end of the first threaded rod passes through the first long slot and is threadedly sleeved with a first nut.

[0019] Preferably, the fixed printing component includes a second cross frame, the second cross frame is fixedly connected to the wall of the lifting frame, a second long slot hole is penetrated through the second cross frame, a plurality of second Z-shaped mounting seats are arranged on the second cross frame at equal intervals, a second 3D printing nozzle is fixedly installed on the second Z-shaped mounting seat, a second threaded rod is fixedly connected to the back of the second Z-shaped mounting seat, and one end of the second threaded rod passes through the second long slot hole and is threadedly sleeved with a second nut.

[0020] Preferably, two support legs are symmetrically and fixedly connected to one side of the bottom of the table board, a walking wheel is rotatably connected to the bottom end of the support leg, a sliding seat is fixedly connected to the bottom of the table board, and the sliding seat is slidably connected to the inside of the table frame.

[0021] Preferably, a first motor is fixedly installed on the wall of the table frame, a second horizontal threaded rod is rotatably connected to the table frame, one end of the second horizontal threaded rod passes through the table frame and is fixedly connected to the rotating end of the first motor, and the sliding seat is horizontally penetrated and threadedly sleeved on the second horizontal threaded rod.

[0022] Preferably, a winding frame is fixedly connected to one side of the lifting frame, two winding rollers are rotatably connected to the winding frame, winding motors corresponding to the winding rollers one by one are fixedly installed on the wall of the winding frame, and one end of the winding roller passes through the winding frame and is fixedly connected to the rotating end of the corresponding winding motor.

[0023] Preferably, the hot pressing and forming mechanism includes a mold support, a mold core, an upper hot pressing concave mold and a lower hot pressing concave mold. The upper hot pressing concave mold is arranged above the mold core, the lower hot pressing concave mold is arranged below the mold core, two lower electric cylinders are symmetrically arranged on both sides of the lower hot pressing concave mold, two upper electric cylinders are symmetrically arranged on both sides of the upper hot pressing concave mold, the upper electric cylinders and the lower electric cylinders are both fixedly installed on the mold support, the telescopic end of the upper electric cylinder is fixedly connected to the outer wall of the upper hot pressing concave mold, and the telescopic end of the lower electric cylinder is fixedly connected to the outer wall of the lower hot pressing concave mold.

[0024] Compared with the related art, a grille-based composite thin-walled tubular extension arm and its manufacturing method and equipment provided by the present invention have the following beneficial effects:

[0025] 1. Compared with the traditional composite thin-walled tubular extension arm, the grille-based composite thin-walled tubular extension arm in the present invention further realizes lightweight while realizing adjustable multi-directional stiffness, ensures the balance of curling stiffness and load-bearing performance, and the specific stiffness of the load-bearing performance is improved; the continuous fiber grille structure forms a sensing network capable of monitoring strain, realizes the integration of structure and function, and has broad application prospects in the intelligence of composite thin-walled tubular extension walls.

[0026] 2. From the printing of the grid belt to the winding and then to the hot pressing and forming, all links of the present invention are closely connected. The winding motor drives the winding roller to wind the printed grid belt, and the hot pressing and forming mechanism hot presses and forms the two groups of wound grid belts, realizing the continuous manufacturing of the composite thin-walled tubular extension arm with a grid structure, and effectively solving the problem of size limitation in manufacturing large-size composite thin-walled tubular extension arms in the traditional technology.

[0027] 3. The present invention uses multiple first 3D printing nozzles and multiple second 3D printing nozzles to operate simultaneously, and through the drive and coordinated operation of the first motor and the second motor, realizes the continuous printing of the grid belt, greatly shortening the printing time and significantly improving the production efficiency.

[0028] 4. In the present invention, the first 3D printing nozzle and the second 3D printing nozzle work together, and the first 3D printing nozzle moves reciprocally while the second 3D printing nozzle moves with the platen. This printing method effectively avoids the problems of fiber cross-contamination and nozzle interference, and ensures the accuracy of fiber cross-points. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic structural diagram of the composite thin-walled tubular extension arm with a grid structure in the present invention;

[0030] Figure 2 It is a partial structure of the composite thin-walled tubular extension arm with a grid structure formed after hot pressing and forming the grid belt by the hot pressing and forming mechanism in the present invention;

[0031] Figure 3 It is a physical diagram of the composite thin-walled tubular extension arm with a grid structure formed after hot pressing and forming the grid belt by the hot pressing and forming mechanism in the present invention;

[0032] Figure 4 It is a schematic overall structural diagram of the manufacturing equipment of the composite thin-walled tubular extension arm based on the grid in the present invention;

[0033] Figure 5 It is a schematic partial structural diagram of the manufacturing equipment of the composite thin-walled tubular extension arm based on the grid in the present invention;

[0034] Figure 6 It is a schematic partial structural diagram of the manufacturing equipment of the composite thin-walled tubular extension arm based on the grid in the present invention;

[0035] Figure 7 It is a schematic structural diagram at the lifting frame in the present invention;

[0036] Figure 8 It is a schematic structural diagram at the plinth in the present invention;

[0037] Figure 9 It is a schematic structural diagram at the platen in the present invention;

[0038] Figure 10 is a schematic structural view of the moving printing component in the present invention;

[0039] Figure 11 is an exploded schematic view of the moving printing component in the present invention;

[0040] Figure 12 is a schematic structural view of the fixed printing component in the present invention;

[0041] Figure 13 is an exploded schematic view of the fixed printing component in the present invention;

[0042] Figure 14 is a schematic structural view of the hot pressing and forming mechanism in the present invention.

[0043] Reference numerals in the figure: 1, bench; 2, support frame; 3, lifting electric cylinder; 4, lifting frame; 5, table board; 6, sliding sleeve; 7, moving mechanism; 701, slider; 702, vertical shaft; 8, moving printing component; 801, first cross frame; 802, first long slot hole; 803, first Z-shaped mounting seat; 804, first 3D printing nozzle; 805, first threaded rod; 806, first nut; 9, fixed printing component; 901, second cross frame; 902, second long slot hole; 903, second Z-shaped mounting seat; 904, second 3D printing nozzle; 905, second threaded rod; 906, second nut; 10, first motor; 11, support leg; 12, traveling wheel; 13, second motor; 14, first horizontal threaded rod; 15, horizontal sliding rod; 16, second horizontal threaded rod; 17, sliding seat; 18, winding motor; 19, winding roller; 20, winding frame; 21, hot pressing and forming mechanism; 2101, die bracket; 2102, die core; 2103, upper hot pressing concave die; 2104, lower hot pressing concave die; 2105, upper electric cylinder; 2106, lower electric cylinder; 22, grid belt; 2201, straight grid strip; 2202, inclined grid strip; 2203, convex arc part; 2204, concave arc part; 2205, flat part. Detailed implementation manners

[0044] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0045] Embodiment 1

[0046] Please refer to Figures 1 to 3 , a grid-based composite thin-walled tubular extension arm, including two grid belts 22 arranged symmetrically up and down, a convex arc part 2203 is arranged in the middle of the grid belt 22, concave arc parts 2204 are arranged on both sides of the convex arc part 2203, a flat part 2205 is arranged on one side of the concave arc part 2204, and the grid belt 22 includes a plurality of straight grid strips 2201 and inclined grid strips 2202.

[0047] Further, referring to Figure 1 , Figure 1 (c) is a three-dimensional schematic diagram of the composite thin-walled tubular extension arm. According to the central symmetry of the cross-section, only 1 / 4 of the cross-section needs to be parametrically designed. As shown in Figure 1 (c), this part consists of three sections, namely a convex arc section, a concave arc section, and a straight section. Define the radii of the convex arc section and the concave arc section, the central angle a, the length b of the straight section, and the thickness t of the printing tape. For specific cross-section parameters, please refer to Table 1 below:

[0048]

[0049] The three-dimensional schematic diagram of the composite thin-walled tubular extension arm is as shown in Figure 1 (d). Figure 1 (d) shows the structure of the straight grid bars 2201 and the inclined grid bars 2202 in a local area of the printed grid belt 22. This structure is consistent with the 3D printing path. The structure consists of nodes and line elements connecting the nodes. Geometrically, it is a combination of regular hexagons and equilateral triangles. Define the parameter line width w, line spacing l, spacing d between the line and the node, and angles θ and β of the lattice. For lattice parameters in the current work, please refer to Table 2 below:

[0050]

[0051] Among the above, compared with the traditional tubular extension wall, the composite thin-walled tubular extension arm has the following properties: lighter weight (weight reduction of 25%-50%); adjustable multi-directional stiffness, achieving a balance between the curling stiffness (reduction of 90%) and the load-bearing performance (only 60% loss), and the specific stiffness of the load-bearing performance is still improved; it can achieve structure-function integration, and the continuous fiber grid structure forms a sensing network capable of monitoring strain, and the force-resistance effect sensitivity reaches 0.15 Ω / N.

[0052] Example Two

[0053] Please refer to Figures 1 to 13 , a manufacturing method of a grid-based composite thin-walled tubular extension arm, and the method steps are as follows:

[0054] Step 1: According to the printing requirements, loosen the first nut 806, move the position of the first threaded rod 805 in the first long slot hole 802, drive the first Z-shaped mounting seat 803 and the first 3D printing nozzle 804 to move, adjust the spacing between adjacent first 3D printing nozzles 804. After the adjustment is completed, tighten the first nut 806 to fix the position. Similarly, loosen the second nut 906, move the position of the second threaded rod 905 in the second long slot hole 902, and adjust the spacing between adjacent second 3D printing nozzles 904, so as to adjust the spacing between adjacent first 3D printing nozzles 804 and the spacing between adjacent second 3D printing nozzles 904 according to the printing spacing requirements.

[0055] Step 2: Respectively convey the melted continuous fiber composite material to the first 3D printing nozzle 804 and the second 3D printing nozzle 904 through an external feeding system. Use the heating blocks installed on the first 3D printing nozzle 804 and the second 3D printing nozzle 904 to heat the continuous fiber reinforced composite material under the action of the electric heating rods to make it meet the printing required temperature, and at the same time, monitor the temperature in real time through the temperature sensor.

[0056] Step 3: Start the second motor 13, drive the first horizontal threaded rod 14 to rotate through the second motor 13, make the moving mechanism 7 drive the moving printing component 8 to move, and further make the first 3D printing nozzle 804 move along the axial direction of the cross slide bar 15; start the first motor 10, drive the second horizontal threaded rod 16 to rotate, make the table board 5 move, and the second 3D printing nozzle 904 of the fixed printing component 9 moves with the table board 5 to extrude the continuous fiber composite material to form a straight grid strip 2201 on the table board 5. The moving direction of the first 3D printing nozzle 804 is perpendicular to the moving direction of the table board 5 and moves reciprocally to print an inclined grid strip 2202. A plurality of straight grid strips 2201 and inclined grid strips 2202 are combined to form a grid belt 22. Multiple first 3D printing nozzles 804 and multiple second 3D printing nozzles 904 work simultaneously to improve the printing efficiency.

[0057] Step 4: Start the lifting electric cylinder 3, drive the lifting frame 4 to slide on the sliding sleeve 6 through the telescopic movement of its telescopic end, so that the moving printing component 8 and the fixed printing component 9 are synchronously adjusted in height to adapt to the printing material with different thicknesses or the requirements of complex printing structures.

[0058] Step 5: Rewinding operation: During the printing process, start the rewinding motor 18, drive the rewinding roller 19 to rotate, and rewind the printed grid belt 22.

[0059] Step 6: Drive the two winding rollers 19 to wind the two groups of grille belts 22 respectively through the two winding motors 18. After the winding is completed, start the upper electric cylinder 2105 and the lower electric cylinder 2106 to create a space between the upper hot pressing concave die 2103 and the lower hot pressing concave die 2104 and the die core 2102. Place the two groups of grille belts 22 above and below the die core 2102 respectively, and then control the telescopic ends of the upper electric cylinder 2105 and the lower electric cylinder 2106 to extend, so that the upper hot pressing concave die 2103 and the lower hot pressing concave die 2104 perform hot pressing on the grille belts 22. After each section of hot pressing, pull the hot-pressed part forward for the next section of hot pressing. Finally, a composite thin-walled tubular extension arm with a grille structure is formed, and the convex arc parts 2203 formed in the middle of the two grille belts 22 are symmetrically combined into a tube.

[0060] Embodiment 3

[0061] Please refer to Figures 4 to 13 , a manufacturing device for a composite thin-walled tubular extension arm based on a grille, including a bench 1 and a hot pressing and forming mechanism 21. A support frame 2 is fixedly connected to the bottom of the bench 1. A lifting electric cylinder 3 is fixedly installed on the wall of the support frame 2. The telescopic end of the lifting electric cylinder 3 is fixedly connected to a lifting frame 4. A table board 5 is arranged above the bench 1; Four sliding sleeves 6 are symmetrically and fixedly connected to the outside of the bench 1, and the lifting frame 4 is slidably connected to the four sliding sleeves 6; One side of the upper part of the lifting frame 4 is rotatably connected to a first horizontal threaded rod 14. A horizontal sliding rod 15 is fixedly connected to one side of the upper part of the lifting frame 4. A second motor 13 is fixedly installed on the wall of the lifting frame 4. One end of the first horizontal threaded rod 14 passes through the lifting frame 4 and is fixedly connected to the rotating end of the second motor 13; A moving mechanism 7 is installed on the horizontal sliding rod 15; A moving printing component 8 is installed below the moving mechanism 7; A fixed printing component 9 is installed on the wall of the lifting frame 4; The moving mechanism 7 is used to guide the moving printing component 8 so that the moving printing component 8 linearly moves along the axial direction of the horizontal sliding rod 15.

[0062] Furthermore, a winding frame 20 is fixedly connected to one side of the lifting frame 4. Two winding rollers 19 are rotatably connected to the winding frame 20. Winding motors 18 corresponding to the winding rollers 19 are fixedly installed on the wall of the winding frame 20. One end of the winding roller 19 passes through the winding frame 20 and is fixedly connected to the rotating end of the corresponding winding motor 18.

[0063] Furthermore, the moving mechanism 7 includes a slider 701 and a vertical shaft 702. The slider 701 is slidably sleeved on the horizontal sliding rod 15. The slider 701 is threadedly sleeved on the first horizontal threaded rod 14. The top end of the vertical shaft 702 is fixedly connected to the bottom of the slider 701.

[0064] Further, the moving printing component 8 includes a first cross frame 801, the first cross frame 801 is fixedly connected to the bottom end of the vertical shaft 702, a first long slot hole 802 is transversely penetrated through the first cross frame 801, several first Z-shaped mounting seats 803 are equidistantly arranged on the first cross frame 801, a first 3D printing nozzle 804 is fixedly installed on the first Z-shaped mounting seat 803, a first threaded rod 805 is fixedly connected to the back surface of the first Z-shaped mounting seat 803, and one end of the first threaded rod 805 passes through the first long slot hole 802 and is threadedly sleeved with a first nut 806.

[0065] Further, the first horizontal threaded rod 14 and the horizontal sliding rod 15 are arranged in parallel.

[0066] Further, referring to Figures 1 to 10 , on the basis of Embodiment 3, the fixed printing component 9 includes a second cross frame 901, the second cross frame 901 is fixedly connected to the wall of the lifting frame 4, a second long slot hole 902 is penetrated through the second cross frame 901, several second Z-shaped mounting seats 903 are equidistantly arranged on the second cross frame 901, a second 3D printing nozzle 904 is fixedly installed on the second Z-shaped mounting seat 903, a second threaded rod 905 is fixedly connected to the back surface of the second Z-shaped mounting seat 903, and one end of the second threaded rod 905 passes through the second long slot hole 902 and is threadedly sleeved with a second nut 906.

[0067] Further, heating blocks and temperature sensors are installed on both the first 3D printing nozzle 804 and the second 3D printing nozzle 904, and electric heating rods are installed on the heating blocks.

[0068] In the above, the molten continuous fiber composite material is respectively conveyed to the first 3D printing nozzle 804 and the second 3D printing nozzle 904 through an external feeding system, providing a material basis for printing. The heating blocks installed on the first 3D printing nozzle 804 and the second 3D printing nozzle 904 heat the continuous fiber reinforced composite material under the action of the electric heating blocks to make it meet the required temperature for printing. At the same time, the temperature sensors monitor the temperature in real time to ensure that the temperature of the printing material is in a suitable printing state.

[0069] In the above, the fixed printing component 9 is fixed on the lifting frame 4 without changing its position. The second 3D printing nozzle 904 extrudes the continuous fiber composite material as the platen 5 moves, forming parallel straight lines on the platen 5. The first 3D printing nozzle 804 and the second 3D printing nozzle 904 work together to form a three-dimensional grid-like structure.

[0070] In the above, by loosening the first nut 806 and then moving the position of the first threaded rod 805 within the first long slot hole 802, the position of the first 3D printing nozzle 804 is moved by driving the first Z-shaped mounting seat 803 through the movement of the first threaded rod 805, so that the distance between two adjacent first 3D printing nozzles 804 can be adjusted. Thus, the distance of the grid lines printed by the first 3D printing nozzle 804 can be adjusted according to the printing requirements. After adjusting to the required distance, the first nut 806 is tightened again to make it abut against the first cross frame 801, so that the position of the first 3D printing nozzle 804 is limited, thus realizing the adjustment of the spacing between several first 3D printing nozzles 804. By loosening the second nut 906 and then moving the position of the second threaded rod 905 within the second long slot hole 902, the position of the second 3D printing nozzle 904 is moved by driving the second Z-shaped mounting seat 903 through the movement of the second threaded rod 905, so that the distance between two adjacent second 3D printing nozzles 904 can be adjusted. After adjusting to the required distance, the second Z-shaped mounting seat 903 is tightened to make it abut against the second cross frame 901, so that the position of the second 3D printing nozzle 904 is limited, thus realizing the adjustment of the spacing between several second Z-shaped mounting seats 903.

[0071] In the above, the second motor 13 drives the first horizontal threaded rod 14 to rotate. With the threaded connection and cooperation between the first horizontal threaded rod 14 and the slider 701, the rotation of the first horizontal threaded rod 14 drives the slider 701 to move along the axial direction of the horizontal slide bar 15. The slider 701 drives the vertical shaft 702 to move synchronously, so as to drive the moving printing component 8 to move synchronously through the vertical shaft 702. At the same time, the first motor 10 is started, and the first motor 10 drives the second horizontal threaded rod 16 to rotate. With the threaded connection and cooperation between the second horizontal threaded rod 16 and the sliding seat 17, the rotation of the second horizontal threaded rod 16 drives the sliding seat 17 to slide inside the gantry 1. The sliding seat 17 drives the table board 5 to move synchronously. At the same time, the walking wheels 12 roll on the ground, and the table board 5 is supported by the walking wheels 12 and the support legs 11. While the table board 5 is moving, the second 3D printing nozzle 904 in the fixed printing component 9 extrudes the continuous fiber composite material onto the table board 5 to form parallel straight grid bars 2201. The moving direction of the first 3D printing nozzle 804 is perpendicular to the moving direction of the table board 5. As the table board 5 moves to the left and the first 3D printing nozzle 804 reciprocates for printing, the first 3D printing nozzle 804 prints continuous "W"-shaped inclined grid bars 2202 on the table board 5. Furthermore, through the continuous extrusion of the fiber composite material by the first 3D printing nozzle 804 and the second 3D printing nozzle 904, the grid belt 22 with a three-dimensional grid network structure is formed by combining multiple straight grid bars 2201 and multiple inclined grid bars 2202, completing the continuous printing of the grid belt 22. Multiple first 3D printing nozzles 804 and multiple second 3D printing nozzles 904 print simultaneously, greatly improving the printing efficiency. And when using the first 3D printing nozzle 804 for moving printing and the second 3D printing nozzle 904 for printing, the table board 5 is driven to move while the second 3D printing nozzle 904 does not move, effectively solving the problems of fiber cross-contamination and nozzle interference in the traditional multi-nozzle system.

[0072] In the above, the telescopic end of the lifting electric cylinder 3 expands and contracts to drive the lifting frame 4 to lift and lower, so that the lifting frame 4 slides on the sliding sleeve 6, realizing the adjustment of the height of the lifting frame 4. The lifting frame 4 drives the moving printing component 8 and the fixed printing component 9 to adjust the height synchronously.

[0073] Embodiment 4

[0074] Furthermore, please refer to Figures 4 to 13 On the basis of Embodiment 3, two support legs 11 are symmetrically and fixedly connected to one side of the bottom of the table board 5. The bottom ends of the support legs 11 are rotatably connected with the walking wheels 12. The bottom of the table board 5 is fixedly connected with a sliding seat 17, and the sliding seat 17 is slidably connected inside the gantry 1.

[0075] Further, a first motor 10 is fixedly installed on the frame wall of the bench 1. A second horizontal threaded rod 16 is rotatably connected to the bench 1. One end of the second horizontal threaded rod 16 passes through the bench 1 and is fixedly connected to the rotating end of the first motor 10. A sliding seat 17 is horizontally penetrated and threadedly sleeved on the second horizontal threaded rod 16.

[0076] Further, the lifting electric cylinder 3, the first motor 10, the second motor 13, and the winding motor 18 are all electrically connected to an external controller through wires. The external controller controls the operation of the lifting electric cylinder 3, the first motor 10, the second motor 13, and the winding motor 18.

[0077] In the above, the first motor 10 drives the second horizontal threaded rod 16 to rotate. The second horizontal threaded rod 16 is threadedly connected to the sliding seat 17 at the bottom of the table board 5. Therefore, when the second horizontal threaded rod 16 rotates, the sliding seat 17 slides inside the bench 1, driving the table board 5 to move synchronously, and the traveling wheels 12 roll on the ground to assist in supporting.

[0078] In the above, when the winding motor 18 is started, the winding motor 18 drives the winding roller 19 to rotate. The winding roller 19 winds the printed grid belt 22, realizing the winding work, completing the production of the continuous thin-walled tubular extension arm, greatly improving the production efficiency of the grid belt 22. Two winding motors 18 respectively drive two winding rollers 19 to wind two groups of grid belts 22.

[0079] Embodiment Five

[0080] Further, please refer to Figures 4 to 14 , on the basis of Embodiment Four, the hot pressing and forming mechanism 21 includes a die holder 2101, a die core 2102, an upper hot pressing female die 2103, and a lower hot pressing female die 2104. The upper hot pressing female die 2103 is arranged above the die core 2102, and the lower hot pressing female die 2104 is arranged below the die core 2102. Two lower electric cylinders 2106 are symmetrically arranged on both sides of the lower hot pressing female die 2104. Two upper electric cylinders 2105 are symmetrically arranged on both sides of the upper hot pressing female die 2103. The upper electric cylinders 2105 and the lower electric cylinders 2106 are both fixedly installed on the die holder 2101. The telescopic end of the upper electric cylinder 2105 is fixedly connected to the outer wall of the upper hot pressing female die 2103, and the telescopic end of the lower electric cylinder 2106 is fixedly connected to the outer wall of the lower hot pressing female die 2104.

[0081] Further, electric heating plates and temperature sensors are arranged on both the upper hot pressing female die 2103 and the lower hot pressing female die 2104. The temperature sensors are used to detect the temperature during hot pressing. The electric heating plates heat the upper hot pressing female die 2103 and the lower hot pressing female die 2104 to make their temperatures meet the requirements of hot pressing.

[0082] In the above, for the hot pressing forming operation, the upper electric cylinder 2105 and the lower electric cylinder 2106 are started. The telescopic end of the upper electric cylinder 2105 contracts to drive the upper hot pressing female die 2103 to move upward, and the telescopic end of the lower electric cylinder 2106 contracts to drive the lower hot pressing female die 2104 to move downward, so that a space allowing the grille belt 22 to pass through is left between both the lower hot pressing female die 2104 and the upper hot pressing female die 2103 and the die core 2102. Then, one end of the grille belt 22 on one of the winding rollers 19 is pulled over and placed above the die core 2102, and one end of the grille belt 22 on the other winding roller 19 is pulled over and placed below the die core 2102. Then, the telescopic ends of the upper electric cylinder 2105 and the lower electric cylinder 2106 are controlled to extend, so that both the lower hot pressing female die 2104 and the upper hot pressing female die 2103 approach the die core 2102, thereby hot pressing and forming the upper and lower grille belts 22 respectively by the lower hot pressing female die 2104 and the upper hot pressing female die 2103. After hot pressing each section, the hot-pressed part is pulled forward for the hot pressing of the next section. A convex arc portion 2203 is formed in the middle of the two grille belts 22 after hot pressing, and two symmetrical convex arc portions 2203 form a tube, so that the final grille-structured composite thin-walled tubular extension arm is formed by hot pressing and forming.

[0083] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present invention.

Claims

1. A composite thin-walled tubular extension arm based on a grid, characterized in that: The invention comprises two grille belts (22) which are symmetrically arranged in an upper and lower direction, wherein a convex arc portion (2203) is arranged in the middle of the grille belt (22), concave arc portions (2204) are arranged on both sides of the convex arc portion (2203), and a straight portion (2205) is arranged on one side of the concave arc portion (2204), and the grille belt (22) comprises a plurality of straight grille bars (2201) and oblique grille bars (2202).

2. A method for manufacturing a grid-based composite thin-walled tubular extension arm as claimed in claim 1, characterized in that: The method steps are as follows: Step 1: adjusting the spacing between adjacent first 3D printing nozzles (804) and the spacing between adjacent second 3D printing nozzles (904); Step 2: delivering the melted continuous fiber composite material to the first 3D printing nozzle (804) and the second 3D printing nozzle (904); Step 3: The second 3D printing nozzle (904) moves along with the platen (5) to extrude the continuous fiber composite material to form straight grid bars (2201) on the platen (5); the first 3D printing nozzle (804) moves perpendicular to the direction of movement of the platen (5) and prints out oblique grid bars (2202) in a reciprocating motion; and a plurality of first 3D printing nozzles (804) and a plurality of second 3D printing nozzles (904) operate simultaneously; Step 4: The telescopic end of the lifting electric cylinder (3) is extended and retracted to drive the lifting frame (4) to slide on the sliding sleeve (6), so that the movable printing component (8) and the fixed printing component (9) are adjusted in height synchronously; Step 5: The winding motor (18) drives the winding roller (19) to rotate, and the printed grid tape (22) is wound up; Step six: hot-pressing the two groups of rolled grid strips (22) by means of a hot-pressing forming mechanism (21) to prepare a final composite thin-wall tubular extension arm.

3. A manufacturing device for manufacturing the grid-based composite thin-walled tubular extension arm as claimed in claim 1, and the manufacturing device is used to implement the manufacturing method of the grid-based composite thin-walled tubular extension arm as claimed in claim 2, comprising a stand (1) and a hot pressing forming mechanism (21), characterized in that: The bottom of the platform (1) is fixedly connected to a support frame (2), a lifting electric cylinder (3) is fixedly installed on the frame wall of the support frame (2), the telescopic end of the lifting electric cylinder (3) is fixedly connected to a lifting frame (4), and a table plate (5) is arranged above the platform (1); Four sliding sleeves (6) are symmetrically and fixedly connected to the outer side of the platform (1), and the lifting frame (4) is slidably connected to the four sliding sleeves (6); A first transverse threaded rod (14) is rotatably connected to one side of the upper portion of the lifting frame (4), a transverse sliding rod (15) is fixedly connected to one side of the upper portion of the lifting frame (4), a second motor (13) is fixedly mounted on the frame wall of the lifting frame (4), and one end of the first transverse threaded rod (14) passes through the lifting frame (4) and is fixedly connected to the rotating end of the second motor (13); A moving mechanism (7) is installed on the horizontal sliding rod (15); a moving printing component (8) is installed at the lower part of the moving mechanism (7); and a fixed printing component (9) is installed on the wall of the lifting frame (4); The moving mechanism (7) is used to guide the movable printing component (8) so that the movable printing component (8) moves linearly along the axial direction of the transverse sliding rod (15).

4. The manufacturing equipment of the grid-based composite thin-wall tubular extension arm according to claim 3, characterized in that: The moving mechanism (7) comprises a slider (701) and a vertical shaft (702); the slider (701) is slidably sleeved on the horizontal sliding rod (15); the slider (701) is threadedly sleeved on the first horizontal threaded rod (14); and the top end of the vertical shaft (702) is fixedly connected to the bottom end of the slider (701).

5. The manufacturing equipment of the grid-based composite thin-wall tubular extension arm according to claim 4, characterized in that: The dynamic printing component (8) comprises a first horizontal frame (801), the first horizontal frame (801) is fixedly connected to the bottom end of the vertical axis (702), a first long slot hole (802) is horizontally penetrated on the first horizontal frame (801), a plurality of first Z-shaped mounting seats (803) are arranged at equal distances on the first horizontal frame (801), a first 3D printing nozzle (804) is fixedly mounted on the first Z-shaped mounting seat (803), a first threaded rod (805) is fixedly connected to the back side of the first Z-shaped mounting seat (803), and one end of the first threaded rod (805) passes through the first long slot hole (802) and is threadedly sleeved with a first nut (806).

6. The manufacturing equipment of the grid-based composite thin-wall tubular extension arm according to claim 5, characterized in that: The fixed printing component (9) comprises a second cross frame (901), the second cross frame (901) is fixedly connected to the frame wall of the lifting frame (4), a second long slot hole (902) is penetrated through the second cross frame (901), a plurality of second Z-shaped mounting seats (903) are arranged at equal distances on the second cross frame (901), a second 3D printing nozzle (904) is fixedly mounted on the second Z-shaped mounting seat (903), a second threaded rod (905) is fixedly connected to the back side of the second Z-shaped mounting seat (903), and one end of the second threaded rod (905) passes through the second long slot hole (902) and is threadedly sleeved with a second nut (906).

7. The manufacturing equipment of the grid-based composite thin-wall tubular extension arm according to claim 6, characterized in that: Two supporting legs (11) are symmetrically fixedly connected to one side of the bottom of the platform (5), and the bottom ends of the supporting legs (11) are rotatably connected to walking wheels (12). A sliding seat (17) is fixedly connected to the bottom of the platform (5), and the sliding seat (17) is slidably connected to the inner side of the platform (1).

8. The manufacturing equipment of the grid-based composite thin-wall tubular extension arm according to claim 7, characterized in that: A first motor (10) is fixedly mounted on the frame wall of the frame (1), and a second transverse threaded rod (16) is rotatably connected to the frame (1). One end of the second transverse threaded rod (16) passes through the frame (1) and is fixedly connected to the rotating end of the first motor (10), and the sliding seat (17) is transversely threadedly sleeved on the second transverse threaded rod (16).

9. The manufacturing equipment of the grid-based composite thin-wall tubular extension arm according to claim 3, characterized in that: A winding frame (20) is fixedly connected to one side of the lifting frame (4), and two winding rollers (19) are rotatably connected to the winding frame (20). A winding motor (18) corresponding to the winding rollers (19) is fixedly installed on the frame wall of the winding frame (20), and one end of the winding roller (19) passes through the winding frame (20) and is fixedly connected to the rotating end of the corresponding winding motor (18).

10. The manufacturing equipment of the grid-based composite thin-wall tubular extension arm according to claim 3, characterized in that: The hot pressing forming mechanism (21) comprises a mold support (2101), a mold core (2102), an upper hot pressing die (2103) and a lower hot pressing die (2104); the upper hot pressing die (2103) is arranged above the mold core (2102); the lower hot pressing die (2104) is arranged below the mold core (2102); two lower electric cylinders (2106) are symmetrically arranged on both sides of the lower hot pressing die (2104); two upper electric cylinders (2105) are symmetrically arranged on both sides of the upper hot pressing die (2103); the upper electric cylinders (2105) and the lower electric cylinders (2106) are both fixedly mounted on the mold support (2101); the telescopic end of the upper electric cylinder (2105) is fixedly connected to the outer wall of the upper hot pressing die (2103); and the telescopic end of the lower electric cylinder (2106) is fixedly connected to the outer wall of the lower hot pressing die (2104).

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