Dielectric elastomer thin film multi-mode stretching device and stretching method

Abstract

The application discloses a dielectric elastomer film multi-mode stretching device and a stretching method. The dielectric elastomer film multi-mode stretching device comprises a base guide rail, a pure shear stretching module, an equal biaxial stretching module, a uniaxial stretching module and a film fixing module. One of the pure shear stretching module, the equal biaxial stretching module or the uniaxial stretching module is installed on the base guide rail. The film fixing module is assembled on one of the pure shear stretching module, the equal biaxial stretching module or the uniaxial stretching module. The uniaxial stretching module, the pure shear stretching module and the equal biaxial stretching module all comprise a film shearing type stretching assembly. The film shearing type stretching assembly is connected by a shearing type clamping unit. The application realizes effective clamping and uniform stretching of the dielectric elastomer film through the design of the film shearing type stretching assembly, can accurately control the film stretching multiple, and can meet the demand of different stretching modes by replacing different stretching modules.

Description

Technical Field

[0001] This invention belongs to the field of dielectric elastomer film preparation technology, and particularly relates to a multi-mode stretching device and stretching method for dielectric elastomer films. Background Technology

[0002] Dielectric elastomers are electroactive polymers capable of shape and size changes under electrostatic force. In the preparation of dielectric elastomers, the insulating elastomer film needs to be pre-stretched to reduce its electromechanical instability, increase its maximum deformation amplitude, improve its energy density, and further construct a minimum energy structure for dielectric elastomers with more complex deformation forms. Typically, the pre-stretching mode of a dielectric elastomer film can be characterized by three basic uniform deformation modes of hyperelastics: uniaxial stretching, pure shear stretching, and isobiaxial stretching.

[0003] Existing film stretching devices struggle to balance effective film clamping and uniform deformation when performing various stretching modes, making it difficult to guarantee the performance of the resulting dielectric elastomer. Furthermore, performing uniaxial, pure shear, and iso-biaxial modes requires the manufacture of multiple stretching devices, increasing manufacturing costs. Summary of the Invention

[0004] To at least partially solve the technical problems existing in the prior art, the present invention provides a multi-mode stretching device and stretching method for dielectric elastomer films.

[0005] The multi-mode stretching device for dielectric elastomer films of the present invention includes a base guide rail, a pure shear stretching module, an isoaxial stretching module, a uniaxial stretching module, and a film fixing module. One of the pure shear stretching module, the isoaxial stretching module, or the uniaxial stretching module is mounted on the base guide rail. The film fixing module is assembled on one of the pure shear stretching module, the isoaxial stretching module, or the uniaxial stretching module, wherein:

[0006] The base guide rail includes a main rail, two main rail supports, a tension module fixed base, and a tension module movable base. The two main rail supports are symmetrically arranged at both ends of the main rail. The tension module fixed base is arranged on one of the main rail supports, and the tension module movable base is arranged on the main rail.

[0007] The uniaxial stretching module, the pure shear stretching module, and the biaxial stretching module all include a thin film shear stretching assembly, which is formed by connecting shear clamping units.

[0008] The scissor clamping unit includes a pin connecting rod, a through-hole connecting rod, a directional guide rod film clamp, a straight-insertion film chuck, and two fixing pins. The straight-insertion film chuck is disposed at one end of the directional guide rod film clamp. The through-hole connecting rod is mounted on the directional guide rod film clamp via one of the fixing pins. The pin connecting rod is mounted on the directional guide rod film clamp via the other fixing pin. The middle part of the pin connecting rod is connected to the middle pivot of the through-hole connecting rod.

[0009] Furthermore, in the above-mentioned multi-mode stretching device for dielectric elastomer films, the directional guide rod film clamp is provided with a sliding groove, the directional guide rod film clamp is provided with a mounting hole near the sliding groove, the pin connecting rod is provided with a rotating pin in the middle, the pin connecting rod is provided with connecting pins at both ends, the through hole connecting rod is provided with a rotating shaft through hole in the middle, the through hole connecting rod is provided with connecting through holes at both ends, the rotating pin is inserted into the rotating shaft through hole, the rotating pin is connected to the rotating shaft through hole, one end of the connecting pin passes through the mounting hole and is fixedly connected by the fixing pin, and the other fixing pin passes through the sliding groove and one end of the connecting through hole and is slidably connected to the sliding groove.

[0010] Furthermore, in the above-mentioned multi-mode stretching device for dielectric elastomer films, the pure shear stretching module includes two sets of film shear stretching components, two pure shear module connectors, and two film longitudinal stretching clamps. The two pure shear module connectors are installed in parallel, the two sets of film shear stretching components are symmetrically installed between the two ends of the two pure shear module connectors, and the two film longitudinal stretching clamps are respectively installed in the middle of the two pure shear module connectors by bolts.

[0011] Furthermore, in the aforementioned multi-mode stretching device for dielectric elastomer films, the biaxial stretching module includes four sets of film shearing stretching components, two first latitudinal auxiliary guide rails, two first double right-angle guide frames, two diagonally oriented double right-angle guide frames, diagonal auxiliary guide rails, and two first single-double-axis module connectors. The four sets of film shearing stretching components are arranged in a rectangular shape. The two first double right-angle guide frames are diagonally installed at both ends of the four film shearing stretching components. The two diagonally oriented double right-angle guide frames are diagonally installed at the other two ends of the four film shearing stretching components. The two first latitudinal auxiliary guide rails are correspondingly and laterally installed at the bottom of the first double right-angle guide frames and the diagonally oriented double right-angle guide frames. The diagonal auxiliary guide rails are installed at the bottom of the two diagonally oriented double right-angle guide frames. The two first single-double-axis module connectors are respectively installed at the bottom of the first latitudinal auxiliary guide rails.

[0012] Furthermore, in the above-mentioned multi-mode stretching device for dielectric elastomer films, the bottom of the first double right-angle guide frame is matched with the first latitudinal secondary guide rail, and the first double right-angle guide frame is slidably connected to the first latitudinal secondary guide rail. The bottoms of the two diagonally oriented double right-angle guide frames are matched with the diagonal secondary guide rail, one diagonally oriented double right-angle guide frame is slidably connected to the diagonal secondary guide rail, and the other diagonally oriented double right-angle guide frame is fixedly connected to the diagonal secondary guide rail.

[0013] Furthermore, in the above-mentioned multi-mode stretching device for dielectric elastomer films, the uniaxial stretching module includes two sets of film shearing stretching components, two second single- and double-axis module connectors, two second lateral auxiliary guide rails, and four second double right-angle guide frames. The two second lateral auxiliary guide rails are installed laterally corresponding to each other, and the four second double right-angle guide frames are respectively installed on both sides of the two second lateral auxiliary guide rails. The two sets of film shearing stretching components are respectively installed laterally between the second double right-angle guide frames, and the two second single- and double-axis module connectors are respectively installed on one side of the two second lateral auxiliary guide rails.

[0014] Furthermore, in the above-mentioned dielectric elastomer film multi-mode stretching device, the bottom of the second double right-angle guide frame is matched with the second latitudinal sub-guide rail, and the second double right-angle guide frame is slidably connected to the second latitudinal sub-guide rail.

[0015] Furthermore, in the above-mentioned dielectric elastomer film multi-mode stretching device, the pure shear module connector, the first double right-angle guide frame, the diagonally oriented double right-angle guide frame, and the second double right-angle guide frame are all provided with connecting grooves, and the pure shear module connector, the first double right-angle guide frame, the diagonally oriented double right-angle guide frame, and the second double right-angle guide frame are all provided with fixing holes on the side near the connecting grooves for connecting the film shear stretching assembly;

[0016] The connecting groove is parallel and equal to the groove, the fixing hole is the same diameter as the mounting hole, the fixing pin passes through the fixing hole and connects to the connecting through hole at the other end, and the connecting pin at the other end passes through the connecting groove and is slidably connected by the fixing pin.

[0017] Furthermore, in the above-mentioned multi-mode stretching device for dielectric elastomer films, both the fixed base of the stretching module and the movable base of the stretching module are provided with length-determining slots on their lower sides. The bottom of the movable base of the stretching module is matched with the main guide rail, and the movable base of the stretching module is slidably connected to the main guide rail.

[0018] The multi-mode stretching method for dielectric elastomer films of the present invention includes:

[0019] Pure shear stretching: The pure shear stretching module is installed on the base guide rail. Two pure shear module connectors are fixed to the stretching module fixed base and the stretching module movable base respectively by bolts. The stretching module movable base is moved so that the spacing between the length determining slots is consistent with the length of the film before stretching. The length edge of the film is fixed to the pure shear module connector by the film longitudinal stretching clamp, and the width edge of the film is fixed to the film shear stretching assembly by the direct insertion film clamp. The stretching is performed by moving the stretching module movable base along the main guide rail. The length of the film after stretching is determined according to the length determining slot. Finally, the stretched film is fixed and removed by the film fixing module.

[0020] Equal biaxial stretching: The equal biaxial stretching module is installed on the base guide rail. The first single-biaxial module connector near the fixed end of the diagonal double right-angle guide frame is fixed to the stretching module fixed base with bolts. The first single-biaxial module connector near the sliding end of the diagonal double right-angle guide frame is fixed to the stretching module movable base with bolts. The stretching module movable base is moved so that the spacing between the length determining slots is equal to the length of the film before stretching. Each edge of the film is fixed to the four sets of film shearing stretching components by a straight-insertion film clamp. The stretching module movable base moves along the main guide rail, the sliding end of the diagonal double right-angle guide frame moves along the diagonal secondary guide rail, and the first double right-angle guide frame moves in opposite directions along the first latitudinal secondary guide rail. The length of the film after stretching is determined according to the length determining slot. The film is stretched to the required multiple. Finally, the stretched film is fixed and removed by the film fixing module.

[0021] Single-axis stretching: Two second single / dual-axis module connectors are fixed to the stretching module fixed base and the stretching module movable base respectively with bolts. The stretching module movable base is moved along the main guide rail to make the spacing between the length determining slots consistent with the length of the film before stretching. The position of the second double right-angle guide frame on the second latitudinal auxiliary guide rail is adjusted so that the straight-insertion film clamp on the film shearing stretching assembly can completely clamp the edge of the film. Then, the stretching module movable base is moved along the main guide rail, and the length direction of the film is stretched. The width direction of the film contracts with the internal tension of the film, and the film shearing stretching assembly contracts accordingly to ensure that the film obtains uniform deformation. The length of the film after stretching is determined according to the length determining slots. The film is stretched to the required multiple. Finally, the stretched film is fixed and removed by the film fixing module.

[0022] The multi-mode stretching apparatus and stretching method for dielectric elastomer films of the present invention have the following advantages and beneficial effects:

[0023] The multi-mode stretching device for dielectric elastomer films achieves uniaxial, pure shear, and biaxial pre-stretching and fixing of dielectric elastomer films by installing different modules, effectively reducing manufacturing costs. Through the design of the film shear-type stretching component, it achieves effective clamping and uniform stretching of dielectric elastomer films and can precisely control the film stretching ratio. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for further understanding of the embodiments of the present invention and constitute a part of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0025] Figure 1 This is a schematic diagram of the overall structure of the multi-mode stretching device for dielectric elastomer films of the present invention.

[0026] Figure 2 This is a schematic diagram of the base guide rail structure of the multi-mode stretching device for dielectric elastomer films of the present invention.

[0027] Figure 3 This is a schematic diagram of the scissor-clamping unit structure of the multi-mode stretching device for dielectric elastomer films of the present invention.

[0028] Figure 4 This is a schematic diagram of the interconnection method of multiple units of the scissor-type clamping unit of the multi-mode stretching device for dielectric elastomer films of the present invention.

[0029] Figure 5 This is a schematic diagram of the installation structure of the film shearing stretching component of the multi-mode stretching device for dielectric elastomer films of the present invention.

[0030] Figure 6 This is a schematic diagram of the pure shear stretching module of the multi-mode stretching device for dielectric elastomer films of the present invention.

[0031] Figure 7 This is a schematic diagram of the biaxial stretching module structure of the multi-mode stretching device for dielectric elastomer films of the present invention.

[0032] Figure 8 This is a schematic diagram of the uniaxial stretching module structure of the multi-mode stretching device for dielectric elastomer films of the present invention.

[0033] Figure 9 This is a schematic diagram of the pure shear stretching module of the multi-mode stretching device for dielectric elastomer films of the present invention, installed on the base guide rail in the stretching state.

[0034] Figure 10This is a schematic diagram of the biaxial stretching module, such as the dielectric elastomer film multi-mode stretching device of the present invention, mounted on the base guide rail in a stretching state.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1: Base guide rail; 11: Main guide rail; 12: Main guide rail support; 13: Tension module fixed base; 14: Tension module movable base; 15: Length determining slot.

[0037] 2: Pure shear stretching module; 21: Pure shear module connector; 22: Film longitudinal stretching clamp;

[0038] 3: Equal biaxial tensioning module; 31: First latitudinal auxiliary guide rail; 32: First double right-angle guide frame; 33: Diagonal oriented double right-angle guide frame; 34: Diagonal auxiliary guide rail; 35: First single / double axis module connector;

[0039] 4: Single-axis tension module; 41: Second single / dual-axis module connector; 42: Second weft auxiliary guide rail; 43: Second double right-angle guide frame;

[0040] 5: Thin film fixing module;

[0041] 6: Thin film shearing stretching assembly; 61: Scissor clamping unit;

[0042] 62: Pin connecting rod; 621: Rotary pin; 622: Connecting pin;

[0043] 63: Through-hole connecting rod; 631: Through-hole shaft; 632: Connecting through-hole;

[0044] 64: Directional guide rod diaphragm clamp; 641: Slide groove; 642: Mounting hole;

[0045] 65: Straight-insertion membrane clamp; 66: Fixing pin;

[0046] 7: Connecting groove; 8: Fixing hole. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0048] like Figures 1 to 8As shown, the multi-mode stretching device for dielectric elastomer films of the present invention includes a base guide rail 1, a pure shear stretching module 2, an equal biaxial stretching module 3, a uniaxial stretching module 4, and a film fixing module 5. One of the pure shear stretching module 2, the equal biaxial stretching module 3, or the uniaxial stretching module 4 is mounted on the base guide rail 1, and the film fixing module 5 is assembled on one of the pure shear stretching module 2, the equal biaxial stretching module 3, or the uniaxial stretching module 4.

[0049] The base guide rail 1 includes a main rail 11, two main rail supports 12, a tension module fixed base 13, and a tension module movable base 14. The two main rail supports 12 are symmetrically arranged at both ends of the main rail 11, the tension module fixed base 13 is arranged on one of the main rail supports, and the tension module movable base 14 is arranged on the main rail 11.

[0050] The uniaxial stretching module 4, the pure shear stretching module 2, and the biaxial stretching module 3 all include a film shear stretching assembly 6 to realize the film stretching function. The film shear stretching assembly 6 is formed by connecting scissor clamping units 61.

[0051] The scissor clamping unit 61 includes a pin connecting rod 62, a through-hole connecting rod 63, a directional guide rod film clamp 64, a straight-insertion film chuck 65, and two fixing pins 66. The straight-insertion film chuck 65 is disposed at one end of the directional guide rod film clamp 64. The through-hole connecting rod 63 is mounted on the directional guide rod film clamp 64 through one of the fixing pins 66. The pin connecting rod 62 is mounted on the directional guide rod film clamp 64 through the other fixing pin 66. The middle part of the pin connecting rod 62 is connected to the middle part of the through-hole connecting rod 63 via a pivot.

[0052] Furthermore, in the aforementioned multi-mode stretching device for dielectric elastomer films, a groove 641 is provided on the directional guide rod film clamp 64, and a mounting hole 642 is provided on the side of the directional guide rod film clamp 64 near the groove 641. A rotating pin 621 is provided in the middle of the pin connecting rod 62, and connecting pins 622 are provided at both ends of the pin connecting rod 62. A rotating shaft through hole 63 is provided in the middle of the through hole connecting rod 63, and connecting through holes 632 are provided at both ends of the through hole connecting rod 63. The rotating pin 621 is inserted into the rotating shaft through hole 631 and is connected to the rotating shaft through hole 631. One end of the connecting pin 622 passes through the mounting hole 642 and is fixedly connected by a fixing pin 66. The fixed pin 66 passes through the slide groove 641 and the connecting through hole 632 at one end, and is slidably connected to the slide groove 641. When multiple sets of scissor clamping units 61 are connected to form a film shearing stretching assembly 6, the angle between the pin shaft connecting rod 62 and the through hole connecting rod 63 on each scissor clamping unit 61 is always consistent, thereby ensuring the uniformity of film stretching. The through hole connecting rod 63 of the scissor clamping unit 61 to be connected in front and the pin shaft connecting rod 62 of the scissor clamping unit 61 to be connected in the rear are connected in the slide groove 641, thereby effectively locking the spatial orientation of the directional guide rod film clamp 64 to be consistent with the stretching direction, ensuring the effective clamping of the film by the directional guide rod film clamp 64.

[0053] Furthermore, in the above-mentioned multi-mode stretching device for dielectric elastomer films, the pure shear stretching module 2 includes two sets of film shear stretching components 6, two pure shear module connectors 21, and two film longitudinal stretching clamps 22. The two pure shear module connectors 21 are installed in parallel, the two sets of film shear stretching components 6 are symmetrically installed between the two ends of the two pure shear module connectors 21, and the two film longitudinal stretching clamps 22 are respectively installed in the middle of the two pure shear module connectors 21 by bolts, thereby effectively ensuring that the film is stretched in the length direction while maintaining a constant width during stretching.

[0054] Furthermore, in the aforementioned multi-mode stretching device for dielectric elastomer films, the biaxial stretching module 3 includes four sets of film shearing stretching components 6, two first latitudinal auxiliary guide rails 31, two first double right-angle guide frames 32, two diagonally oriented double right-angle guide frames 33, diagonal auxiliary guide rails 34, and two first single-double-axis module connectors 35. The four sets of film shearing stretching components 6 are installed in a rectangular shape. The two first double right-angle guide frames 32 are diagonally installed at both ends of the four film shearing stretching components 6, and the two diagonally oriented double right-angle guide frames 33 are diagonally installed at the other two ends of the four film shearing stretching components 6. The two first latitudinal auxiliary guide rails 31 are correspondingly installed laterally at the bottom of the first double right-angle guide frames 32 and the diagonally oriented double right-angle guide frames 33. The diagonal auxiliary guide rails 34 are installed at the bottom of the two diagonally oriented double right-angle guide frames 33, and the two first single-double-axis module connectors 35 are respectively installed at the bottom of the first latitudinal auxiliary guide rails 31.

[0055] Furthermore, in the aforementioned multi-mode stretching device for dielectric elastomer films, the bottom of the first double right-angle guide frame 32 is matched with the first latitudinal secondary guide rail 31, and the first double right-angle guide frame 32 is slidably connected to the first latitudinal secondary guide rail 31. The bottom of the two diagonally oriented double right-angle guide frames 33 is matched with the diagonal secondary guide rail 34, one diagonally oriented double right-angle guide frame 33 is slidably connected to the diagonal secondary guide rail 34, and the other diagonally oriented double right-angle guide frame 33 is fixedly connected to the diagonal secondary guide rail 34. Through the constraint of the two diagonally oriented double right-angle guide frames 33, the angle between the diagonal secondary guide rail 34 and the main guide rail 11 and the first latitudinal secondary guide rail 31 is always 45 degrees. Due to the displacement constraint effect of the diagonal guide rail, the diagonally oriented double right-angle guide frame 33 connected to it will always maintain the same longitudinal displacement and latitudinal displacement.

[0056] Furthermore, in the above-mentioned multi-mode stretching device for dielectric elastomer films, the uniaxial stretching module 4 includes two sets of film shearing stretching components 6, two second single- and double-axis module connectors 41, two second lateral sub-guide rails 42, and four second double right-angle guide frames 43. The two second lateral sub-guide rails 42 are installed laterally corresponding to each other, and the four second double right-angle guide frames 43 are respectively installed on both sides of the two second lateral sub-guide rails 42. The two sets of film shearing stretching components 6 are respectively installed laterally between the second double right-angle guide frames 43, and the two second single- and double-axis module connectors 41 are respectively installed on one side of the two second lateral sub-guide rails 42.

[0057] Furthermore, in the above-mentioned multi-mode stretching device for dielectric elastomer films, the bottom of the second double right-angle guide frame 43 is matched with the second latitudinal auxiliary guide rail 42, and the second double right-angle guide frame 43 and the second latitudinal auxiliary guide rail 42 are slidably connected, thereby effectively ensuring that while stretching the film in the length direction, the film width is reduced by the effect of the film's internal tension.

[0058] Furthermore, in the above-mentioned dielectric elastomer film multi-mode stretching device, the pure shear module connector 21, the first double right-angle guide frame 32, the diagonally oriented double right-angle guide frame 33, and the second double right-angle guide frame 43 are all provided with connecting grooves 7. The pure shear module connector 21, the first double right-angle guide frame 32, the diagonally oriented double right-angle guide frame 33, and the second double right-angle guide frame 43 are all provided with fixing holes 8 on the side near the connecting grooves 7, for connecting the film shear stretching assembly 6, thereby effectively ensuring that the film shear stretching assembly 6 can symmetrically extend and retract along the stretching direction, thereby effectively controlling the two first double right-angle guide frames 32 to have the same displacement on the first latitudinal sub-guide rail 31 or the two second double right-angle guide frames 43 on the second latitudinal sub-guide rail 42;

[0059] The connecting groove 7 is parallel and equal to the groove 641. The fixing hole 8 and the mounting hole 642 have the same diameter. The fixing pin 66 passes through the fixing hole 8 and connects to the connecting through hole 632 at the other end. The connecting pin 622 at the other end passes through the connecting groove 7 and is slidably connected by the fixing pin 66. When connected to the film shearing stretching assembly 6, the distance between the leading edge of the directional guide rod film clamp 64 and the leading edge of the connecting groove 7 remains constant. This ensures that during the film stretching process, only the base displacement needs to be controlled to effectively and accurately control the film stretching ratio.

[0060] Furthermore, in the above-mentioned multi-mode stretching device for dielectric elastomer films, both the fixed base 13 and the movable base 14 of the stretching module are provided with length determining slots 15 on their lower sides for determining the dimensions of the film before and after stretching. The bottom of the movable base 14 of the stretching module is matched with the main guide rail 11, and the movable base 14 of the stretching module is slidably connected to the main guide rail 11. The length determining slots 15 facilitate the length measuring device to determine the dimensions of the film before and after stretching.

[0061] The multi-mode stretching method for dielectric elastomer films of the present invention includes:

[0062] like Figure 9 As shown, pure shear stretching mode: The pure shear stretching module 2 is installed on the base guide rail 1. The two pure shear module connectors 21 are fixed to the stretching module fixed base 13 and the stretching module movable base 14 respectively by bolts. The stretching module movable base 14 is moved so that the spacing between the length determining slots 15 is consistent with the length of the film before stretching. The edge of the film in the length direction is fixed to the pure shear module connector 21 by the film longitudinal stretching clamp 22. The film in the width direction is fixed to the film shear stretching assembly 6 by the straight insertion film clamp 65. The stretching is performed by moving the stretching module movable base 14 along the main guide rail 11. The length of the film after stretching is determined according to the length determining slots 15. Finally, the film is fixed and removed by the film fixing module 5.

[0063] like Figure 10As shown, the biaxial stretching mode is as follows: The biaxial stretching module 3 is installed on the base guide rail 1. The first single-biaxial module connector 35, which is fixed at one end near the diagonal double right-angle guide frame 33, is fixed to the stretching module fixed base 13 by bolts. The first single-biaxial module connector 35, which is fixed at one sliding end near the diagonal double right-angle guide frame 33, is fixed to the stretching module movable base 14 by bolts. The displacement stretching module movable base 14 is adjusted so that the spacing between the length determining slots 15 is equal to the length of the film before stretching. Each edge of the film is fixed to the four sets of film shearing stretching components 6 by the straight-insertion film clamps 65. The stretching module movable base 14 moves along the main guide rail 11, the sliding end of the diagonal double right-angle guide frame 33 moves along the diagonal secondary guide rail 34, and the first double right-angle guide frame 32 moves in opposite directions along the first lateral secondary guide rail to stretch the film to the required multiple. Finally, the film is fixed and removed by the film fixing module 5.

[0064] like Figure 8 As shown, in single-axis stretching mode: two second single / dual-axis module connectors 41 are fixed to the stretching module fixed base 13 and the stretching module movable base 14 respectively by bolts. The stretching module movable base 14 is moved along the main guide rail 11 so that the spacing between the length determining slots 15 is consistent with the length of the film before stretching. The position of the second double right-angle guide frame 43 on the second latitudinal auxiliary guide rail 42 is adjusted so that the straight-insertion film clamp 65 on the film shearing stretching assembly 6 can completely clamp the edge of the film. Then, the stretching module movable base 14 is moved along the main guide rail 11, and the length direction of the film is stretched. The width direction of the film contracts with the internal tension of the film, and the film shearing stretching assembly 6 contracts accordingly to ensure that the film obtains uniform deformation. The length of the film after stretching is determined according to the length determining slots 15. The film is stretched to the required multiple. Finally, the stretched film is fixed and removed by the film fixing module 5.

[0065] In summary, compared with the prior art, the multi-mode stretching device and stretching method for dielectric elastomer films of the present invention have the following advantages and beneficial effects: the multi-mode stretching device for dielectric elastomer films realizes uniaxial, pure shear, and biaxial pre-stretching and fixing of dielectric elastomer films by installing different modules, effectively reducing manufacturing costs. Through the design of the film shear-type stretching component, effective clamping and uniform stretching of the dielectric elastomer film are achieved, and the film stretching ratio can be precisely controlled, ensuring the performance of the prepared dielectric elastomer.

[0066] It should be noted that, unless otherwise expressly specified and limited, the term "connection" or its synonyms should be interpreted broadly in this document. For example, "connection" can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Furthermore, expressions such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Meanwhile, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. In addition, the terms "front," "rear," "left," "right," "upper," and "lower" in this document refer to the placement states shown in the accompanying drawings.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dielectric elastomer film multi-mode stretching apparatus, characterized by, The dielectric elastomer film multi-mode stretching device comprises a base guide rail, a pure shear stretching module, an equal biaxial stretching module, a uniaxial stretching module and a film fixing module, one of the pure shear stretching module, the equal biaxial stretching module or the uniaxial stretching module is installed on the base guide rail, and the film fixing module is assembled on one of the pure shear stretching module, the equal biaxial stretching module or the uniaxial stretching module, wherein: The base guide rail comprises a main guide rail, two main guide rail supports, a stretching module fixed base and a stretching module movable base, the two main guide rail supports are symmetrically arranged at both ends of the main guide rail, the stretching module fixed base is arranged on one of the main guide rail supports, and the stretching module movable base is arranged on the main guide rail. The uniaxial stretching module, the pure shear stretching module and the equal biaxial stretching module all comprise a film shearing type stretching assembly, and the film shearing type stretching assembly is connected by a shearing type clamping unit. The shearing type clamping unit comprises a pin shaft connecting rod, a through hole connecting rod, a directional guide rod film clamp, a straight insertion type film chuck and two fixed pins, the straight insertion type film chuck is arranged at one end of the directional guide rod film clamp, the through hole connecting rod is installed on the directional guide rod film clamp through one of the fixed pins, the pin shaft connecting rod is installed on the directional guide rod film clamp through the other fixed pin, and the middle part of the pin shaft connecting rod is connected with the middle part of the through hole connecting rod in a rotating shaft mode. The directional guide rod film clamp is provided with a sliding groove, the side close to the sliding groove of the directional guide rod film clamp is provided with a mounting hole, the middle part of the pin shaft connecting rod is provided with a rotating pin shaft, the two ends of the pin shaft connecting rod are provided with connecting pin shafts, the middle part of the through hole connecting rod is provided with a rotating shaft through hole, and the two ends of the through hole connecting rod are provided with connecting through holes, the rotating pin shaft is inserted into the rotating shaft through hole, the rotating pin shaft is connected with the rotating shaft through hole in a rotating shaft mode, one end of the connecting pin shaft passes through the mounting hole and is fixedly connected through the fixed pin, and the other fixed pin passes through the sliding groove and one end of the connecting through hole and is connected with the sliding groove in a sliding mode.

2. The dielectric elastomer thin film multi-mode stretching apparatus according to claim 1, characterized in that: The pure shear stretching module comprises two groups of film shearing type stretching assemblies, two pure shear module connectors and two film longitudinal stretching clamps, the two pure shear module connectors are installed in parallel, the two groups of film shearing type stretching assemblies are symmetrically installed between the two pure shear module connectors, and the two film longitudinal stretching clamps are respectively installed in the middle parts of the two pure shear module connectors through bolts.

3. The dielectric elastomer thin film multi-mode stretching apparatus according to claim 2, wherein, The equal-biaxial stretching module comprises four groups of film shear type stretching assemblies, two first weft direction sub-rails, two first double-right-angle guide frames, two diagonal directional double-right-angle guide frames, a diagonal sub-rail and two first single-biaxial module connectors, the four groups of film shear type stretching assemblies are arranged in a square shape, two first double-right-angle guide frames are diagonally installed at two ends of the four film shear type stretching assemblies, two diagonal directional double-right-angle guide frames are diagonally installed at the other two ends of the four film shear type stretching assemblies, two first weft direction sub-rails are correspondingly installed horizontally at the bottom of the first double-right-angle guide frames and the diagonal directional double-right-angle guide frames, the diagonal sub-rail is installed at the bottom of the two diagonal directional double-right-angle guide frames, and the two first single-biaxial module connectors are respectively installed at the bottom of the first weft direction sub-rails.

4. The dielectric elastomer thin film multi-mode stretching apparatus according to claim 3, wherein, The bottom of the first double-right-angle guide frame is matched with the first weft direction sub-rail, the first double-right-angle guide frame is in sliding connection with the first weft direction sub-rail, the bottom of the two diagonal directional double-right-angle guide frames is matched with the diagonal sub-rail, one diagonal directional double-right-angle guide frame is in sliding connection with the diagonal sub-rail, and the other diagonal directional double-right-angle guide frame is in fixed connection with the diagonal sub-rail.

5. The dielectric elastomer film multi-mode stretching apparatus according to claim 4, wherein, The single-axial stretching module comprises two groups of film shear type stretching assemblies, two second single-biaxial module connectors, two second weft direction sub-rails and four second double-right-angle guide frames, the two second weft direction sub-rails are correspondingly installed horizontally, the four second double-right-angle guide frames are respectively installed on both sides of the two second weft direction sub-rails, the two groups of film shear type stretching assemblies are respectively installed horizontally between the second double-right-angle guide frames, and the two second single-biaxial module connectors are respectively installed on one side of the two second weft direction sub-rails.

6. The dielectric elastomer film multi-mode stretching apparatus according to claim 5, wherein, The bottom of the second double-right-angle guide frame is matched with the second weft direction sub-rail, and the second double-right-angle guide frame is in sliding connection with the second weft direction sub-rail.

7. The dielectric elastomer thin film multi-mode stretching apparatus according to claim 6, wherein, The pure shear module connector, the first double-right-angle guide frame, the diagonal directional double-right-angle guide frame and the second double-right-angle guide frame are all provided with a connecting sliding groove, and the pure shear module connector, the first double-right-angle guide frame, the diagonal directional double-right-angle guide frame and the second double-right-angle guide frame are all provided with a fixing hole on the side close to the connecting sliding groove, for connecting the film shear type stretching assembly. The connecting sliding groove is parallel and equal to the sliding groove, the fixing hole is of the same diameter as the mounting hole, the fixing pin passes through the fixing hole and is connected with the connecting through hole at the other end, and the connecting pin shaft at the other end passes through the connecting sliding groove and is in sliding connection through the fixing pin.

8. The dielectric elastomer thin film multi-mode stretching apparatus according to claim 7, wherein, The lower side of the stretching module fixed base and the stretching module movable base is provided with a length determining clamping groove, the bottom of the stretching module movable base is matched with the main rail, and the stretching module movable base is in sliding connection with the main rail.

9. A stretching method using the dielectric elastomer film multi-mode stretching apparatus according to claim 8, characterized by, The dielectric elastomer film multi-mode stretching method comprises: Pure shear mode stretching: install the pure shear stretching module on the base guide rail, fix the two pure shear module connectors on the stretching module fixed base and the stretching module movable base respectively by bolts, move the stretching module movable base to make the distance between the length determination card slots consistent with the length of the film before stretching, fix the lengthwise edges of the film on the pure shear module connectors through the film longitudinal stretching clamps, fix the widthwise edges of the film on the film shear type stretching assembly through the straight insertion type film clamp, move along the main guide rail through the stretching module movable base, and determine the length of the stretched film according to the length determination card slots; finally, fix the stretched film through the film fixing module and take it off; Equal biaxial mode stretching: install the equal biaxial stretching module on the base guide rail, fix the first single-biaxial module connector close to the fixed end of the diagonal directional double right-angle guide frame on the stretching module fixed base through a bolt, fix the first single-biaxial module connector close to the sliding end of the diagonal directional double right-angle guide frame on the stretching module movable base through a bolt, move the stretching module movable base to make the distance between the length determination card slots equal to the length of the film before stretching, fix the edges of the film on the four groups of film shear type stretching assemblies through the straight insertion type film clamp respectively, move along the main guide rail through the stretching module movable base, move the sliding end of the diagonal directional double right-angle guide frame along the diagonal vice guide rail, move the first double right-angle guide frame in the opposite direction along the first weft vice guide rail, and determine the length of the stretched film according to the length determination card slots; stretch the film to the required multiple, and finally fix the stretched film through the film fixing module and take it off; Single-axis mode stretching: fix the two second single-biaxial module connectors on the stretching module fixed base and the stretching module movable base respectively through bolts, move the stretching module movable base along the main guide rail to make the distance between the length determination card slots consistent with the length of the film before stretching, adjust the position of the second double right-angle guide frame on the second weft vice guide rail to make the straight insertion type film clamp on the film shear type stretching assembly be able to hold the edges of the film completely, then move the stretching module movable base along the main guide rail, the lengthwise direction of the film is stretched, the widthwise direction of the film shrinks with the internal tension of the film, the film shear type stretching assembly shrinks accordingly to ensure that the film obtains uniform deformation; determine the length of the stretched film according to the length determination card slots, stretch the film to the required multiple, and finally fix the stretched film through the film fixing module and take it off.

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