Programmable alloy wire / liquid crystal elastomer fiber hot drawing integrated forming preparation method and device

Abstract

The invention provides a programmable alloy wire / liquid crystal elastomer fiber hot drawing integrated forming preparation method and device, and belongs to the technical field of functional materials and hot drawing fibers. Through the preparation method and device, fibers with alloy wires coated with liquid crystal elastomers can be formed through one-time hot drawing; the problems of complexity and time consumption of a preparation method of clamping the electrothermal material between two layers of liquid crystal elastomers step by step at the present stage are solved, the fiber length is not limited, and the method is suitable for large-scale production. By designing an operable heating system, the alloy wire can be controlled to uniformly, accurately and locally heat the liquid crystal elastomer by utilizing a voltage value and pulse time, so that the liquid crystal elastomer generates rapid contraction or mechanical work output, and selective or sequential programmable driving of alloy wire / liquid crystal elastomer fibers is realized. The response time of the alloy wire / liquid crystal elastomer fiber is smaller than or equal to 0.2 second, the movement bandwidth is larger than or equal to 0.5 Hz, the load dead weight is larger than or equal to 2000 times, the cycle life is larger than or equal to 1000 times, and the alloy wire / liquid crystal elastomer fiber has huge application space in the aspects of movement assistance, man-machine interaction and the like

Description

Technical Field

[0002] The present invention belongs to the technical field of functional materials and heat-drawn fibers, and in particular relates to a method and device for preparing programmable alloy wire / liquid crystal elastomer fibers by heat-drawing integrated molding. Background Art

[0004] Liquid crystal elastomer is a typical flexible actuator stimulus response material. When heated, the liquid crystal unit will change from anisotropy to isotropy, causing macroscopic contraction. The internal stress generated by this reversible deformation is equivalent to that of human muscle. Therefore, elastic liquid crystals have attracted widespread attention in recent years in the fields of artificial muscles, soft robots, bionic materials, etc.

[0005] Compared with indirect thermal stimulation, direct thermal stimulation can avoid the key problem of air hindering heat diffusion. Using the Joule effect to convert electrical energy into thermal energy is one of the most effective ways to make liquid crystal elastomers produce rapid electrothermal response and deformation. By combining with electrothermal materials to give full play to the advantages of liquid crystal elastomers, a fast, precise and programmable actuation strategy is a very ideal solution. The current commonly used solution is to sandwich the electrothermal material between two layers of liquid crystal elastomers in a step-by-step manner. The preparation method is complex and time-consuming, and the preparation size is limited, making it difficult to mass produce. Summary of the invention

[0006] In order to solve the above problems, the present invention provides a programmable alloy wire / liquid crystal elastomer fiber hot drawing integrated molding preparation method and device.

[0007] The technical solution adopted by the present invention is specifically as follows: A programmable alloy wire / liquid crystal elastomer fiber and its hot drawing integrated forming device, the main components of the device include an alloy wire feeding turntable 1, a three-dimensional displacement platform 2, a clamp 3, a liquid crystal elastomer preform 4, a heating furnace 5, a wire drawing constant speed roller 6, an alloy wire / liquid crystal elastomer fiber 7, an alloy wire / liquid crystal elastomer fiber storage tray 8, a plane position measuring instrument 9, a three-dimensional displacement platform position control system 10, a heating furnace temperature control system 11, a constant speed roller speed control system 12, a fiber diameter measuring instrument 13, a liquid crystal elastomer preform mold box 14 and a replaceable through-cavity component 15.

[0008] The replaceable through-cavity component 15 is a sleeve component with different inner diameters, which is installed in the liquid crystal elastomer preform mold box 14 and is used to prepare liquid crystal elastomer preforms 4 with different through-cavity diameters. The alloy wire feeding turntable 1 is fixedly installed at the top of the device, and the three-dimensional displacement platform 2 is arranged below the alloy wire feeding turntable 1. The liquid crystal elastomer preform rod 4 is clamped and fixed by a clamp 3 fixed on the three-dimensional displacement platform 2 and kept in a vertical direction. A heating furnace 5 is arranged below the three-dimensional displacement platform 2. The liquid crystal elastomer preform rod 4 is moved vertically by the three-dimensional displacement platform 2 to feed the liquid crystal elastomer preform rod 4 into the heating furnace 5. A wire drawing constant speed roller 6 and an alloy wire / liquid crystal elastomer fiber storage tray 8 are arranged below the heating furnace 5. The alloy wire is fed out from the alloy wire feeding turntable 1, passes through the through cavity of the liquid crystal elastomer preform rod 4, and is formed into an alloy wire / liquid crystal elastomer fiber 7 by heat drawing in a heating furnace 5, and is tightened by a wire drawing constant speed roller 6 at the bottom, and is fed into the alloy wire / liquid crystal elastomer fiber storage tray 8 at the bottom; The three-dimensional displacement platform position control system 10 is used to control the position of the three-dimensional displacement platform 2; the heating furnace temperature control system 11 is used to adjust the heating temperature parameters of the heating furnace 5; the constant speed roller speed control system 12 is used to adjust the drawing speed of the constant speed drawing roller 6.

[0009] Furthermore, a plane position measuring instrument 9 is installed between the three-dimensional displacement platform 2 and the heating furnace 5. The plane position measuring instrument 9 is used to measure the position of the liquid crystal elastomer preform rod 4 and send the position signal to the three-dimensional displacement platform position control system 10, so as to control the three-dimensional displacement platform 2 to drive the liquid crystal elastomer preform rod 4 to move in a plane perpendicular to the height direction, thereby realizing closed-loop automatic control of the preform rod to reach the center position of the heating furnace 5.

[0010] Furthermore, a fiber diameter measuring instrument 13 is provided below the wire drawing constant speed roller 6 for measuring the alloy wire / liquid crystal elastomer fiber 7, and the three-dimensional displacement platform position control system 10 and the constant speed roller speed control system 12 can automatically control the feeding speed of the liquid crystal elastomer preform rod 4 and the wire drawing speed of the wire drawing constant speed roller 6 in a closed loop according to the fiber diameter signal of the fiber diameter measuring instrument 13, and finally obtain the alloy wire / liquid crystal elastomer fiber 7 of the target diameter; The diameter of the alloy wire / liquid crystal elastomer fiber 7 is determined by the diameter of the liquid crystal elastomer preform rod 4, the feed speed and the drawing speed of the drawing constant speed roller 6, as shown by the following relationship: In the formula, The diameter of alloy wire / LCE fiber is 7 mm. For the liquid crystal elastomer preform rod 4 diameter (mm), is the preform feeding speed of the three-dimensional displacement platform 2 (mm / min), is the drawing speed of the drawing constant speed roller 6 (mm / min).

[0011] The present invention provides a programmable alloy wire / liquid crystal elastomer fiber and a method for preparing the same by thermal drawing, and the specific steps are as follows: Step 1: Prepare a liquid crystal elastomer preform 4 having a through cavity of a desired diameter by using a liquid crystal elastomer preform mold box 14 and a replaceable through cavity assembly 15; Step 2: guide the alloy wire of the alloy wire feeding turntable 1 into the through cavity of the liquid crystal elastomer preform rod 4, and fix it on the plane perpendicular to the height direction of the three-dimensional displacement platform 2 by the clamp 3; Step 3: Use the three-dimensional displacement platform position control system 10 to control the three-dimensional displacement platform 2 to drive the liquid crystal elastomer preform 4 to the center of the heating furnace 5; Step 4: The heating furnace 5 is turned on through the heating furnace temperature control system 11 to heat the liquid crystal elastomer preform 4 to a semi-molten state, and after the necking region is formed, the wire drawing constant speed roller 6 slowly pulls it into a fiber; Step 5: Use the three-dimensional displacement platform position control system 10 to control the three-dimensional displacement platform 2 to move downward, and continuously feed the liquid crystal elastomer preform rod 4 to the heating zone; Step 6: Clamp the fibers formed by hot drawing the alloy wire and liquid crystal elastomer on the wire drawing constant speed roller 6, use the constant speed roller speed control system 12 to control the wire drawing speed, draw the alloy wire / liquid crystal elastomer fiber 7, and store it on the alloy wire / liquid crystal elastomer fiber storage tray 8.

[0012] The diameter of the through cavity of the liquid crystal elastomer preform rod 4 in step 1 is determined by the diameter of the alloy wire, which is obtained by the following relationship: In the formula, is the diameter of the through cavity of the liquid crystal elastomer preform 4 (mm), is the alloy wire diameter (mm), is the drawing speed of the drawing constant speed roller 6 (mm / min), is the preform feeding speed of the three-dimensional displacement platform 2 (mm / min). Slightly smaller than This can help the alloy wire to be more tightly wrapped by the liquid crystal elastomer.

[0013] The alloy wire in step 2 is preferably an electrothermal material such as nickel-chromium alloy, copper-nickel alloy, etc.

[0014] The three-dimensional displacement platform position control system 10 of step 3 can receive the preform position signal from the surface position measuring instrument 9 to achieve closed-loop automatic control of the preform position.

[0015] The heating furnace 5 in step 4 is controlled by a heating furnace temperature control system 11. The heating temperature parameters are determined by the rheological properties of the liquid crystal elastomer preform 4. The heating temperature is preferably 300-350 degrees Celsius, and the temperature rise rate is 10-15 degrees Celsius / minute.

[0016] The diameter of the alloy wire / liquid crystal elastomer fiber 7 in step 6 is determined by the diameter of the liquid crystal elastomer preform 4, the feed speed and the drawing speed of the drawing constant speed roller 6, as shown by the following relationship: In the formula, The diameter of alloy wire / LCE fiber is 7 mm. For the liquid crystal elastomer preform rod 4 diameter (mm), is the preform feeding speed of the three-dimensional displacement platform 2 (mm / min), is the drawing speed (mm / min) of the drawing constant speed roller 6. The three-dimensional displacement platform position control system 10 and the constant speed roller speed control system 12 can be closed-loop automatically controlled according to the fiber diameter signal of the fiber diameter measuring instrument 13. and , and finally the alloy wire / liquid crystal elastomer fiber 7 of the target diameter is obtained.

[0017] Beneficial effects of the present invention: The present invention provides a preparation method and device for alloy wire / liquid crystal elastomer fiber and its hot-drawn integrated molding, and a programmable actuation strategy for realizing a flexible actuator under direct thermal stimulation. Through the preparation method and device, a fiber of alloy wire coated with liquid crystal elastomer can be formed by hot-drawing at one time, which solves the problem of complex and time-consuming preparation method of sandwiching electric heating materials between two layers of liquid crystal elastomer in a step-by-step manner at this stage, and the fiber length is not limited, which is suitable for large-scale production. By designing an operable heating system, the alloy wire can be controlled by voltage value and pulse time to uniformly and accurately locally heat the liquid crystal elastomer, so that it produces rapid contraction or mechanical work output, thereby realizing selective or sequential programmable driving of the alloy wire / liquid crystal elastomer fiber. The response time of the alloy wire / liquid crystal elastomer fiber is ≤0.2 seconds, the motion bandwidth is ≥0.5 Hz, the load weight is ≥2000 times, and the cycle life is ≥1000 times. It provides a huge application space for liquid crystal elastomer fibers in sports assistance, human-computer interaction, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the alloy wire / liquid crystal elastomer fiber hot drawing integrated molding device of the present invention.

[0019] Figure 2 This is a physical picture of the copper-nickel alloy wire / liquid crystal elastomer fiber in Example 1.

[0020] Figure 3 This is a microscope image of the copper-nickel alloy wire / liquid crystal elastomer fiber in Example 1.

[0021] Figure 4 Schematic diagram of the copper-nickel alloy wire / liquid crystal elastomer fiber driven finger to achieve selective or sequential programmable actuation strategy in Example 2. DETAILED DESCRIPTION

[0022] The technical solution of the present invention is further explained and illustrated in the form of specific embodiments below.

[0023] Example 1 (Preparation of alloy wire / liquid crystal elastomer fiber by hot-drawing integrated molding) In the present embodiment, a programmable alloy wire / liquid crystal elastomer fiber and its hot drawing integrated forming device is provided, and the main components of the device include an alloy wire feeding turntable 1, a three-dimensional displacement platform 2, a clamp 3, a liquid crystal elastomer preform rod 4, a heating furnace 5, a wire drawing constant speed roller 6, an alloy wire / liquid crystal elastomer fiber 7, an alloy wire / liquid crystal elastomer fiber storage tray 8, a plane position measuring instrument 9, a three-dimensional displacement platform position control system 10, a heating furnace temperature control system 11, a constant speed roller speed control system 12, a fiber diameter measuring instrument 13, a liquid crystal elastomer preform rod mold box 14 and a replaceable through cavity component 15.

[0024] The replaceable through-cavity component 15 is a sleeve component with different inner diameters, which is installed in the liquid crystal elastomer preform mold box 14 and is used to prepare liquid crystal elastomer preforms 4 with different through-cavity diameters. The alloy wire feeding turntable 1 is fixedly installed at the top of the device, and the three-dimensional displacement platform 2 is arranged below the alloy wire feeding turntable 1. The liquid crystal elastomer preform rod 4 is clamped and fixed by a clamp 3 fixed on the three-dimensional displacement platform 2 and kept in a vertical direction. A heating furnace 5 is arranged below the three-dimensional displacement platform 2. The liquid crystal elastomer preform rod 4 is moved vertically by the three-dimensional displacement platform 2 to feed the liquid crystal elastomer preform rod 4 into the heating furnace 5. A wire drawing constant speed roller 6 and an alloy wire / liquid crystal elastomer fiber storage tray 8 are arranged below the heating furnace 5. The alloy wire is fed out from the alloy wire feeding turntable 1, passes through the through cavity of the liquid crystal elastomer preform rod 4, and is formed into an alloy wire / liquid crystal elastomer fiber 7 by heat drawing in a heating furnace 5, and is tightened by a wire drawing constant speed roller 6 at the bottom, and is fed into the alloy wire / liquid crystal elastomer fiber storage tray 8 at the bottom; The three-dimensional displacement platform position control system 10 is used to control the position of the three-dimensional displacement platform 2; the heating furnace temperature control system 11 is used to adjust the heating temperature parameters of the heating furnace 5; the constant speed roller speed control system 12 is used to adjust the drawing speed of the constant speed drawing roller 6.

[0025] A plane position measuring instrument 9 is installed between the three-dimensional displacement platform 2 and the heating furnace 5. The plane position measuring instrument 9 is used to measure the position of the liquid crystal elastomer preform rod 4 and send the position signal to the three-dimensional displacement platform position control system 10, so as to control the three-dimensional displacement platform 2 to drive the liquid crystal elastomer preform rod 4 to move in a plane perpendicular to the height direction, thereby realizing closed-loop automatic control of the preform rod to find the center position of the heating furnace 5.

[0026] A fiber diameter measuring instrument 13 is provided below the wire drawing constant speed roller 6 for measuring the alloy wire / liquid crystal elastomer fiber 7. The three-dimensional displacement platform position control system 10 and the constant speed roller speed control system 12 can automatically control the feeding speed of the liquid crystal elastomer preform rod 4 and the wire drawing speed of the wire drawing constant speed roller 6 in a closed loop according to the fiber diameter signal of the fiber diameter measuring instrument 13, and finally obtain the alloy wire / liquid crystal elastomer fiber 7 of the target diameter; The diameter of the alloy wire / liquid crystal elastomer fiber 7 is determined by the diameter of the liquid crystal elastomer preform rod 4, the feed speed and the drawing speed of the drawing constant speed roller 6, as shown by the following relationship: In the formula, The diameter of alloy wire / LCE fiber is 7 mm. For the liquid crystal elastomer preform rod 4 diameter (mm), is the preform feeding speed of the three-dimensional displacement platform 2 (mm / min), is the drawing speed of the drawing constant speed roller 6 (mm / min).

[0027] The preparation steps in this embodiment are as follows: First, a liquid crystal elastomer preform mold box 14 and a replaceable through-cavity assembly 15 are used to prepare =20 mm, = 1 mm liquid crystal elastomer preform rod 4. = 0.1 mm copper-nickel alloy wire is guided into the through cavity of the liquid crystal elastomer preform rod 4, and fixed by the clamp 3 on the plane of the three-dimensional displacement platform 2 perpendicular to the height direction. Turn on the three-dimensional displacement platform position control system 10, and automatically control the three-dimensional displacement platform 2 to drive the liquid crystal elastomer preform rod 4 to the center of the heating furnace 5. Next, turn on the heating furnace temperature control system 11 to turn on the heating furnace 5, set the heating temperature to 320 degrees Celsius, the temperature rise rate to 12 degrees Celsius / minute, heat the liquid crystal elastomer preform rod 4 to a semi-molten state, form a necking area, and then slowly pull it into a fiber. At the same time, set =1 mm / min, and continuously feed the liquid crystal elastomer preform rod 4 to the heating zone. Finally, the copper-nickel alloy wire and the fiber formed by the liquid crystal elastomer after hot drawing are clamped on the wire drawing constant speed roller 6, and the constant speed roller speed control system 12 is used to set =100 mm / min, drawn =2 mm copper-nickel alloy wire / liquid crystal elastomer fiber 7, and stored by the storage tray 8.

[0028] like Figure 2 , Figure 3 Shown are the actual picture and microscope picture of the copper-nickel alloy wire / liquid crystal elastomer fiber produced by the hot-drawing integrated molding device in this embodiment.

[0029] Example 2 (Programmable actuation strategy of alloy wire / liquid crystal elastomer fiber) like Figure 4 The figure shows a schematic diagram of using the copper-nickel alloy wire / liquid crystal elastomer fiber 7 prepared in Example 1 as a flexible driver to drive the movement of fingers. The copper-nickel alloy wire / liquid crystal elastomer fiber 7 is connected to the heating control system 16, and the voltage value and pulse time can be used to control the copper-nickel alloy wire to uniformly and accurately heat the liquid crystal elastomer locally. For example, in this embodiment, the lower copper-nickel alloy wire / liquid crystal elastomer fiber 7 is first heated to drive the finger to bend, and then the upper copper-nickel alloy wire / liquid crystal elastomer fiber 7 is heated to drive the finger to stretch, and the fingers are alternately heated and driven to reciprocate in sequence. Different fingers can also be heated to achieve selective or sequential programmable driving of the copper-nickel alloy wire / liquid crystal elastomer fiber 7. The copper-nickel alloy wire / liquid crystal elastomer fiber 7 has a thermal response within 0.2 seconds, and the movement bandwidth reaches 0.5 Hz. There is no breakage after 1000 cycles.

Claims

1. A programmable alloy wire / liquid crystal elastomer fiber hot drawing integrated molding device, characterized in that: The main components of the device include: an alloy wire feeding turntable (1), a three-dimensional displacement platform (2), a clamp (3), a liquid crystal elastomer preform rod (4), a heating furnace (5), a wire drawing constant speed roller (6), an alloy wire / liquid crystal elastomer fiber (7), an alloy wire / liquid crystal elastomer fiber storage tray (8), a plane position measuring instrument (9), a three-dimensional displacement platform position control system (10), a heating furnace temperature control system (11), a constant speed roller speed control system (12), a fiber diameter measuring instrument (13), a liquid crystal elastomer preform rod mold box (14) and a replaceable through-cavity component (15); The replaceable through-cavity component (15) is a sleeve component with different inner diameters, which is installed in a liquid crystal elastomer preform mold box (14) and is used to prepare liquid crystal elastomer preforms (4) with different through-cavity diameters. The alloy wire feeding turntable (1) is fixedly installed at the top of the device, the three-dimensional displacement platform (2) is arranged below the alloy wire feeding turntable (1), the liquid crystal elastomer preform rod (4) is clamped and fixed by a clamp (3) fixed on the three-dimensional displacement platform (2) and maintained in a vertical direction, a heating furnace (5) is arranged below the three-dimensional displacement platform (2), and the liquid crystal elastomer preform rod (4) is moved in a vertical direction by the three-dimensional displacement platform (2) to feed the liquid crystal elastomer preform rod (4) into the heating furnace (5); a wire drawing constant speed roller (6) and an alloy wire / liquid crystal elastomer fiber storage tray (8) are arranged below the heating furnace (5); The alloy wire is fed out from the alloy wire feeding turntable (1), passes through the through cavity of the liquid crystal elastomer preform rod (4), and is formed into an alloy wire / liquid crystal elastomer fiber (7) by heat drawing in a heating furnace (5). The alloy wire is tightened by a wire drawing constant speed roller (6) at the bottom and is fed into an alloy wire / liquid crystal elastomer fiber storage tray (8) at the bottom. The three-dimensional displacement platform position control system (10) is used to control the position of the three-dimensional displacement platform (2); the heating furnace temperature control system (11) is used to control the heating temperature parameters of the heating furnace (5); and the constant speed roller speed control system (12) is used to control the wire drawing speed of the wire drawing constant speed roller (6).

2. The programmable alloy wire / liquid crystal elastomer fiber hot drawing integrated molding device according to claim 1, characterized in that: A plane position measuring instrument (9) is installed between the three-dimensional displacement platform (2) and the heating furnace (5). The plane position measuring instrument (9) is used to measure the position of the liquid crystal elastomer preform rod (4) and send a position signal to the three-dimensional displacement platform position control system (10), thereby controlling the three-dimensional displacement platform (2) to drive the liquid crystal elastomer preform rod (4) to move in a plane perpendicular to the height direction, thereby realizing closed-loop automatic control of the preform rod finding the central position of the heating furnace (5).

3. The programmable alloy wire / liquid crystal elastomer fiber hot drawing integrated molding device according to claim 1, characterized in that: A fiber diameter measuring instrument (13) is provided below the wire drawing constant speed roller (6) for measuring the alloy wire / liquid crystal elastomer fiber (7); a three-dimensional displacement platform position control system (10) and a constant speed roller speed control system (12) can automatically control the feeding speed of the liquid crystal elastomer preform rod (4) and the wire drawing speed of the wire drawing constant speed roller (6) in a closed loop according to the fiber diameter signal of the fiber diameter measuring instrument (13), and finally obtain the alloy wire / liquid crystal elastomer fiber (7) of the target diameter; The diameter of the alloy wire / liquid crystal elastomer fiber (7) is determined by the diameter of the liquid crystal elastomer preform rod (4), the feed speed and the drawing speed of the drawing constant speed roller (6), as shown in the following relationship: In the formula, is the diameter of the alloy wire / liquid crystal elastomer fiber (7) (mm), is the diameter of the liquid crystal elastomer preform (4) (mm), is the preform feeding speed of the three-dimensional displacement platform (2) (mm / min), is the drawing speed (mm / min) of the drawing constant speed roller (6).

4. A method for preparing programmable alloy wire / liquid crystal elastomer fiber by hot drawing integrated molding using the device of claim 1, characterized in that: The steps of this method are as follows: Step (1): using a liquid crystal elastomer preform mold box (14) and a replaceable through-cavity assembly (15) to prepare a liquid crystal elastomer preform (4) having a through-cavity of a desired diameter; Step (2): guiding the alloy wire of the alloy wire feeding turntable (1) into the through cavity of the liquid crystal elastomer preform rod (4), and fixing it on a plane perpendicular to the height direction of the three-dimensional displacement platform (2) by a clamp (3); Step (3): using a three-dimensional displacement platform position control system (10) to control the three-dimensional displacement platform (2) to drive the liquid crystal elastomer preform rod (4) to the center position of the heating furnace (5); Step (4): starting the heating furnace (5) through the heating furnace temperature control system (11), heating the liquid crystal elastomer preform rod (4) to a semi-molten state, and then slowly drawing the preform rod (4) into a fiber after a necking region is formed by a wire drawing constant speed roller (6); Step (5): using a three-dimensional displacement platform position control system (10) to control the three-dimensional displacement platform (2) to move downward, and continuously feeding the liquid crystal elastomer preform rod (4) into the heating zone; Step (6): clamping the fibers formed by hot drawing the alloy wire and the liquid crystal elastomer on a wire drawing constant speed roller (6), using a constant speed roller speed control system (12) to control the wire drawing speed, drawing the alloy wire / liquid crystal elastomer fibers (7), and storing them on an alloy wire / liquid crystal elastomer fiber storage tray (8).

5. The method for preparing programmable alloy wire / liquid crystal elastomer fiber by hot drawing and integrated molding according to claim 4, characterized in that: The diameter of the through cavity of the liquid crystal elastomer preform rod (4) in step (1) is determined by the diameter of the alloy wire, as shown in the following relationship: In the formula, is the diameter of the through cavity of the liquid crystal elastomer preform rod (4) (mm), is the alloy wire diameter (mm), is the drawing speed of the drawing constant speed roller (6) (mm / min), is the preform feeding speed of the three-dimensional displacement platform (2) (mm / min); (5) The method for preparing programmable alloy wire / liquid crystal elastomer fiber by hot drawing as claimed in claim 4, characterized in that the alloy wire in step (2) is a nickel-chromium alloy or a copper-nickel alloy.

6. The method for preparing programmable alloy wire / liquid crystal elastomer fiber by hot drawing and integrated molding according to claim 4, characterized in that: The three-dimensional displacement platform position control system (10) of step (3) can receive the preform position signal from the surface position measuring instrument (9) to achieve closed-loop automatic control of the preform position.

7. The method for preparing programmable alloy wire / liquid crystal elastomer fiber by hot drawing and integrated molding according to claim 4, characterized in that: The heating furnace (5) in the step (4) is controlled by a heating furnace temperature control system (11), and the heating temperature parameter is determined by the rheological properties of the liquid crystal elastomer preform (4).

8. The method for preparing programmable alloy wire / liquid crystal elastomer fiber by hot drawing and integrated molding according to claim 7, characterized in that: The heating temperature of the heating furnace (5) is 300-350 degrees Celsius, and the temperature rise rate is 10-15 degrees Celsius per minute.

9. The method for preparing programmable alloy wire / liquid crystal elastomer fiber by hot drawing and integrated molding according to claim 7, characterized in that: The diameter of the alloy wire / liquid crystal elastomer fiber (7) in step (6) is determined by the diameter of the liquid crystal elastomer preform rod (4), the feed speed and the drawing speed of the drawing constant speed roller (6), as shown by the following relationship: In the formula, is the diameter of the alloy wire / liquid crystal elastomer fiber (7) (mm), is the diameter of the liquid crystal elastomer preform (4) (mm), is the preform feeding speed of the three-dimensional displacement platform (2) (mm / min), is the wire drawing speed of the wire drawing constant speed roller (6) (mm / min); The three-dimensional displacement platform position control system (10) and the constant speed roller speed control system (12) can be closed-loop automatically regulated according to the fiber diameter signal of the fiber diameter measuring instrument (13). and , and finally obtain the alloy wire / liquid crystal elastomer fiber (7) of the target diameter.

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