A large-stroke shutter driver driven by a memory alloy driving wire

Abstract

The utility model relates to memory alloy driver technical field, especially a kind of big-stroke grid piece driver driven by using memory alloy driving wire, it is applicable to lock. The parallel mutual superposition mode of insulating driving piece and multiple memory alloy driving wires, make full use of length-width direction space, increase the effective total length of memory alloy driving wire simultaneously, to increase its contraction stroke, and each memory alloy driving wire is in straightened state, no bending, can improve fatigue life, make it to small size, action stroke is big, fatigue performance is good, the utility model can be applied in miniature lock and other scenes, lock cylinder is driven by using driver action, to achieve the purpose of unlocking.

Description

Technical Field

[0001] This utility model relates to the field of shape memory alloy actuator technology, and in particular to a large-stroke grid actuator using shape memory alloy drive wire. It is suitable for locks. Background Technology

[0002] Shape memory alloys (SMAs) are a class of smart materials with thermally induced phase transformation properties, the core of which is the shape memory effect (SME). When an SMA material undergoes plastic deformation in its low-temperature phase (martensitic phase), it can recover its initial preset shape by heating it above the critical phase transformation temperature, while simultaneously outputting significant mechanical work. This characteristic gives it unique advantages in fields such as micro-drives and silent drives.

[0003] Memory alloy actuators are typically composed of memory alloy actuator wires combined with other mechanical structures and electronic circuits to perform certain specific tasks. Memory alloy actuators are characterized by low energy consumption, high efficiency, small size, light weight, quiet operation, and ease of digital control. In recent years, they have been widely used in aerospace, micro-robotics, bionic machinery, minimally invasive surgery, rehabilitation equipment, micro-locks and other industries.

[0004] Defects and shortcomings of existing technology: 1. Large size: Existing driver structure design is not compact enough. The method of winding shape memory alloy wire is often used to increase the driving stroke, resulting in excessive driver size and redundant structural space; 2. Fatigue life defects: Due to the winding method of shape memory alloy drive wire, residual strain is easily generated inside, which will affect the fatigue life of the actuator. 3. Small driving stroke: Since the shape memory alloy driving wire has only 3% to 4% linear shrinkage strain, increasing the stroke will inevitably increase the overall size of the driver, which contradicts the advantages of the driving wire. Therefore, the driving stroke of small-volume drivers is currently small. Utility Model Content

[0005] This invention addresses the shortcomings of existing technologies by providing a large-stroke grid actuator using a shape memory alloy (MMA) drive wire. This linear actuator utilizes the characteristic of the MMA drive wire to contract when heated by electricity and return to its original length when cooled by de-energization, thus driving an actuator mechanism. It can be used in various scenarios requiring linear drive, such as lock unlocking, valve opening and closing, driving components in bionic robots, and releasing loads on valve bodies of underwater robots or drones. Only a small driving current is needed to complete the entire mechanism's action. With a MMA drive wire diameter of 0.1mm, a 0.3A DC current can generate 150g of force, enabling large-stroke grid drive.

[0006] The present invention solves the existing technical problems by adopting the following technical solution: A large-stroke grid actuator using shape memory alloy (MMA) drive wires includes a base, a cover plate, drive bars, support sliding bars, and MMA drive wires. The base has multiple sets of sliding grooves arranged in parallel. The support sliding bars are equipped with sliding buckles, which slidably connect to the sliding grooves via these buckles. There is one set of drive bars and multiple sets of support sliding bars. Multiple sets of support sliding bars are connected end-to-end by MMA drive wires to form a support sliding group. The first end of the support sliding group is connected to the base via the MMA drive wire, and the last end is connected to the drive bar. An actuator plate is located at the upper end of the drive bar. The actuator plate, drive bars, support sliding bars, and MMA drive wires are electrically connected. When energized, the MMA drive wires contract, and the combined contraction of multiple MMA drive wires in the support sliding group drives the drive bar and actuator plate to slide. When de-energized, the MMA drive wires expand and recover their deformation. This invention uses multiple sets of support sliding bars connected in series with MMA drive wires to accumulate deformation wire by wire. Meanwhile, the base and cover plate encapsulate the supporting sliding assembly. The overall dimensions of the actuator are 46mm × 20mm × 3mm (length × height × thickness), with a stroke of 9±0.5mm and a weight of 10g. The shape memory alloy drive wire shrinks by 3.5% when energized, and the large stroke drive is achieved through the superposition of the displacements of multiple drive wires.

[0007] The shape memory alloy drive wire has a copper terminal at its end, which is located at the contact point between the drive wire and the base, drive bar, or support slide bar. The copper terminal is fitted and inserted into the base, drive bar, or support slide bar. The shape memory alloy drive wire is fixed and electrically connected through the copper terminal.

[0008] The actuator plate is equipped with a contact point and a plug, and the base has two electrode posts spaced apart. The actuator plate is connected to the drive bar via the plug, and one end of the actuator plate is connected to a bias spring, which is engaged with one of the electrode posts on the base. The contact point is located at the other end of the actuator plate. The drive bar drives the actuator plate to slide along the interval between the two electrode posts, and the contact point of the actuator plate slides to the other electrode post for a limit contact. This structure enables the electrode posts to be grounded, establishes a limit contact structure, and implements a limit contact grounding circuit, thereby realizing the lock unlocking function.

[0009] It also includes a lock cylinder and a housing. The housing has two sets of through-hole slots. The lock cylinder consists of a lock pin, a latch plate, a return spring, and a locking plate. One end of the lock pin has a latch plate, and the locking plate and return spring are fitted on the lock pin. The other end of the lock pin has the locking plate protruding through it. The lock pin passes into the two sets of through-hole slots. The locking plate and return spring are located between the two sets of through-hole slots. The return spring applies force to press the locking plate tightly onto the through-hole slot. The contact of the actuator plate is in contact with the latch plate. The actuator plate drives the latch plate of the lock cylinder to move through the drive bar.

[0010] The drive bar is provided in one group, and the support sliding bar is provided in seven groups; the shape memory alloy drive wire is divided into eight wires, namely shape memory alloy drive wire I, shape memory alloy drive wire II, shape memory alloy drive wire III, shape memory alloy drive wire IV, shape memory alloy drive wire V, shape memory alloy drive wire VI, shape memory alloy drive wire VII, and shape memory alloy drive wire VIII; the seven groups of support sliding bars are connected end to end by shape memory alloy drive wire II, shape memory alloy drive wire III, shape memory alloy drive wire IV, shape memory alloy drive wire V, shape memory alloy drive wire VI, and shape memory alloy drive wire VII to form a support sliding group; one end of the support sliding group is connected to the base through shape memory alloy drive wire I, and the other end of the support sliding group is connected to the drive bar through shape memory alloy drive wire VIII.

[0011] The base has eight sets of sliding grooves, each set consisting of two parallel sliding grooves spaced apart. This restricts the sliding direction of multiple support sliding sets, ensuring the superposition of the drive wire displacement.

[0012] The diameter of the memory alloy driving wire is 0.1 mm to 0.2 mm.

[0013] The base has a positive terminal A, a negative terminal B, a ground terminal C, an electrode post terminal D, and a copper terminal terminal E. Printed circuit boards are mounted on the base, the supporting sliding bar, and the drive bar. The printed circuit board of the base connects the positive terminal A and the copper terminal terminal E. An electrode spring is mounted on the negative terminal B. The copper terminal terminal E is electrically connected to the printed circuit boards of the supporting sliding bar, the drive bar, the shape memory alloy drive wire, and the actuator plate. The electrode spring is in contact with the actuator plate, connecting the positive and negative circuits. The printed circuit board of the base connects the ground terminal C and the electrode post terminal D. An electrode post is mounted on the electrode post terminal D. The contact of the actuator plate is connected to the electrode post of the electrode post terminal D and grounded. After the contact is grounded, the positive and negative circuits are connected and grounded through the actuator plate. When the shape memory alloy drive wire is de-energized, it recovers its deformation and is reset by a bias spring.

[0014] The supporting sliding bar, driving bar, and actuator are made of high-nickel white copper sheet metal parts, and the high-nickel white copper sheet metal parts are equipped with printed circuit boards, which are PCB circuit boards.

[0015] The electrode spring is model FDX0033C2.

[0016] The beneficial effects of this utility model are as follows: 1. The method of stacking the insulating drive sheet and multiple memory alloy drive wires in parallel makes full use of the space in the length and width directions, while increasing the effective total length of the memory alloy drive wires, thereby increasing its contraction stroke. Moreover, each memory alloy drive wire is in a straight state without bending, which can improve fatigue life. This allows it to be small in size, have a large stroke, and good fatigue performance. The final product size is 46mm*20mm*3mm, the stroke reaches 9±0.5mm, and the weight is only 10g.

[0017] 2. This utility model can be applied to miniature locks and other scenarios. It uses the actuator to drive the lock cylinder, thereby achieving the purpose of unlocking. Currently, most electric locks on the market use electromagnets or motors for driving. Due to the large size and weight of electromagnets or motors, high power consumption, and inability to achieve silent driving, they are limited in some miniature lock scenarios. This utility model effectively solves the above-mentioned technical problems. Attached Figure Description

[0018] Figure 1 This is a three-dimensional exploded structural diagram of the present invention; Figure 2 This is a schematic diagram of the structure of this utility model; Figure 3 This is a side view of the present invention; Figure 4 This is a schematic diagram of the lock cylinder and outer shell of this utility model; Figure 5 for Figure 4 Side view; Figure 6 This is a schematic diagram of the combination of the lock cylinder and the outer shell of this utility model; Figure 7 This is a schematic diagram of the lock cylinder of this utility model; Figure 8 This is a schematic diagram of the initial state of the execution chip when it is not powered on. Figure 9 This is a schematic diagram illustrating the energized sliding state of the actuator. Figure 10 This is a schematic diagram of the lock cylinder in the locked state. Figure 11 This is a diagram showing the unlocked state of the lock cylinder. Figure 12 A schematic diagram of the three-dimensional exploded structure supporting the sliding assembly; Figure 13 for Figure 12 Side view; Figure 14 A schematic diagram illustrating the energized force action of the shape memory alloy drive wire supporting the sliding assembly; Figure 15 This is a schematic diagram of the overall structure of this utility model; Figure 16 This is a schematic diagram of the lock cylinder unlocking action of this utility model; Figure 17 This is a schematic diagram of the wiring terminal layout of the base circuit of this utility model; Figure 18 This is a schematic diagram of the layout of the printed circuit board of the base of this utility model; The markings in the diagram are: 1. Execution plate, VII. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 18. 19. 10. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 10. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 10. 20. 21. 22. 23. 24. 25. 26. 27. 28. 28. 29. 20. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 20. 20. 21. 22. 23. 24. 25. 26. 27. 28. 20 ... Detailed Implementation

[0019] A large-stroke grid actuator driven by a shape memory alloy drive wire includes a base 8, a cover plate 9, a drive bar 4, a support sliding bar 12, and a shape memory alloy drive wire. The base 8 has multiple sets of sliding grooves 26 arranged in parallel. The support sliding bar 12 has sliding buckles 25, which slidably connect to the sliding grooves 26 via the buckles 25. There is one set of drive bars 4 and multiple sets of support sliding bars 12. Multiple sets of support sliding bars 12 are connected end-to-end by shape memory alloy drive wires to form a support sliding group. The first end of the support sliding group is connected to the base 8 via the shape memory alloy drive wire, and the last end is connected to the drive bar 4. An actuator 1 is located at the upper end of the drive bar 4. The actuator 1, drive bar 4, support sliding bar 12, and shape memory alloy drive wire are electrically connected. When energized, the shape memory alloy drive wire contracts, causing the multiple shape memory alloy drive wires in the support sliding group to contract and overlap, thus sliding the drive bar 4 and the actuator 1. When de-energized, the shape memory alloy drive wire expands and recovers its deformation.

[0020] The end of the shape memory alloy drive wire is provided with a copper terminal 15. The copper terminal 15 is located at the contact connection between the shape memory alloy drive wire and the base 8, drive bar 4 or support sliding bar 12. The copper terminal 15 is fitted and inserted into the base 8, drive bar 4 or support sliding bar 12. The actuator 1 is provided with a contact 27 and a plug 28. The base 8 is provided with two electrode posts 5, which are arranged at intervals. The actuator 1 is connected to the drive bar 4 through the plug 28. One end of the actuator 1 is connected to a bias spring 16, which is hooked to one of the electrode posts 5 of the base 8. The contact 27 is located at the other end of the actuator 1. The drive bar 4 drives the actuator 1 to slide along the interval between the two electrode posts 5. The contact 27 of the actuator 1 slides to the other electrode post 5 and makes a stop contact.

[0021] It also includes a lock cylinder 18 and a housing 19. The housing 19 is provided with two sets of through-hole slots 20. The lock cylinder 18 is divided into a lock pin 21, a latch plate 22, a return spring 23, and a locking plate 24. One end of the lock pin 21 is provided with a latch plate 21. The locking plate 24 and the return spring 23 are fitted on the lock pin 21. The other end of the lock pin 21 extends out of the locking plate 24 and enters the two sets of through-hole slots 20. The locking plate 24 and the return spring 23 are located between the two sets of through-hole slots 20. The return spring 23 applies force to press the locking plate 24 tightly on the through-hole slot 20. The contact of the actuator 1 is in contact with the latch plate 22. The actuator 1 drives the latch plate 22 of the lock cylinder 18 to move through the drive bar 4.

[0022] The drive bar 4 is provided in one group, and the support sliding bar 12 is provided in seven groups; the shape memory alloy drive wire is divided into eight wires, namely shape memory alloy drive wire I 13, shape memory alloy drive wire II 11, shape memory alloy drive wire III 10, shape memory alloy drive wire IV 14, shape memory alloy drive wire V 7, shape memory alloy drive wire VI 6, shape memory alloy drive wire VII 2, and shape memory alloy drive wire VIII 3; the seven groups of support sliding bars 12 are connected end to end by shape memory alloy drive wire II 11, shape memory alloy drive wire III 10, shape memory alloy drive wire IV 14, shape memory alloy drive wire V 7, shape memory alloy drive wire VI 6, and shape memory alloy drive wire VII 2 to form a support sliding group; one end of the support sliding group is connected to the base 8 through shape memory alloy drive wire I 13, and the other end of the support sliding group is connected to the drive bar 4 through shape memory alloy drive wire VIII 3.

[0023] The base 8 has eight sets of sliding grooves 26, each set of sliding grooves 26 consisting of two parallel sliding grooves, which are spaced apart. The diameter of the shape memory alloy driving wire is 0.1mm to 0.2mm.

[0024] The base 8 is provided with a positive terminal A, a negative terminal B, a ground terminal C, an electrode post terminal D, and a copper terminal terminal E. Printed circuit boards are provided on the base 8, the supporting sliding bar 12, and the driving bar 4. The printed circuit board of the base 8 connects the positive terminal A and the copper terminal terminal E. An electrode spring 17 is provided on the negative terminal B. The copper terminal terminal E is electrically connected through the printed circuit boards of the supporting sliding bar 12, the driving bar 4, the shape memory alloy driving wire, and the actuator 1. The electrode spring 17 is in contact with the actuator 1 to connect the positive and negative circuits. The printed circuit board of the base 8 connects the ground terminal C and the electrode post terminal D. An electrode post 5 is provided on the electrode post terminal D. The contact 27 of the actuator 1 is connected to the electrode post 5 of the electrode post terminal D and grounded. After the contact 27 is grounded, the positive and negative circuits are connected to the ground through the actuator 1. The shape memory alloy driving wire recovers its deformation after power is cut off and is reset by the bias spring 16. The supporting sliding bar 12, driving bar 4, and actuating plate 1 are made of high-nickel white copper sheet metal parts, and a printed circuit board (PCB) is mounted on the high-nickel white copper sheet metal parts. The electrode spring 17 is model FDX0033C2.

[0025] The specific application details are explained below with reference to the embodiments: To ensure consistent heating resistance of the internal shape memory alloy drive wires in the driver, the wire diameter is the same for drivers of the same model. A larger wire diameter results in greater output force but a slower response time. To meet the design requirements of large-stroke drives, this driver uses a 0.1mm~0.2mm drive wire as an example. Wire diameters exceeding this specification will result in reduced shrinkage, while smaller diameters will lead to insufficient driving force. For example, a 0.1mm diameter shape memory alloy drive wire can provide an output force of 1.3N with a response time of 0.2s, while a 0.2mm diameter shape memory alloy drive wire can provide an output force of 5.3N with a response time of 0.6s. This design utilizes printed circuitry to power the device. Multiple shape memory alloy (MMA) drive wires are stacked in parallel to drive the drive bar, fully utilizing the space in both length and width directions while increasing the effective total length of the MMA drive wires, thus increasing the contraction stroke. Furthermore, each MMA drive wire is straightened without bending, improving fatigue life. This results in a compact size, large stroke, and good fatigue performance. The final product dimensions are 46mm*20mm*3mm, with a stroke of 9±0.5mm and a weight of only 10g. This design can be applied to miniature locks and similar applications, using the actuator to move the lock cylinder and unlock it. Currently, most electronic locks on the market use electromagnets or motors for driving. However, electromagnets and motors are large and heavy, consume a lot of power, and cannot achieve silent operation, thus limiting their use in some scenarios. Figure 10 Figure 11 As shown, this design is applied in a lock actuator scenario. The actuator is fixed to the lock body with two screws. When the actuator is not activated, the lock cylinder is compressed by an internal spring, extending out of the lock body and engaging with the external keyhole to achieve locking. When the actuator is activated, the lock cylinder retracts, unlocking the lock. This design achieves silent operation, is small in size and weight, consumes little power, is easy to install, and allows for modular assembly. Figure 6 As shown, only two fixing screws are needed to connect the outer shell 19 to the base 8. Installation and replacement are relatively simple, and maintenance and replacement are convenient, providing a solution for small space, light weight, and quiet driving scenarios.

[0026] This invention provides a large-stroke grid driver using shape memory alloy driving wires. There are eight shape memory alloy driving wires of the same length and diameter, installed in parallel, but connected in series via circuitry on a supporting sliding bar. There is one driving bar, identical in shape and size to the supporting sliding bar, which is the last stage of the shape memory alloy driving wire group and is used to connect to the actuator, transferring the final superimposed displacement to the actuator. The difference between the driving bar 4 and the supporting sliding bar 12 lies in the copper plating and routing of their surface PCB circuitry. The copper plating on the PCB circuitry of the driving bar 4 and the supporting sliding bar 12 serves a conductive purpose. The driving bar also needs to be in contact with the electrode springs for conductivity. The copper plating process and routing of the PCB circuitry of the driving bar 4 and the supporting sliding bar 12 both employ conventional technical solutions to ensure circuit connectivity. The printed circuit board application here is a conventional solution and will not be elaborated further.

[0027] In normal operation, the actuator is in its initial state under the action of the bias spring. At this time, the memory alloy drive wire inside the actuator is connected end to end with the support slide bar and the drive bar, and is in a taut state under the action of the bias spring. The printed circuit board of the base 8 is connected to the positive terminal A and the copper terminal E. The negative terminal B is provided with an electrode spring 17. The copper terminal E is electrically connected through the printed circuit boards of the support slide bar 12, the drive bar 4, the memory alloy drive wire, and the actuator 1. The electrode spring 17 is in contact with the actuator 1 to connect the positive and negative circuits. The printed circuit board of the base 8 is connected to the ground terminal C and the electrode post terminal D. The electrode post terminal D is provided with an electrode post 5. The contact 27 of the actuator 1 is connected to the electrode post 5 of the electrode post terminal D to ground. After the contact 27 is grounded, the positive and negative circuits are connected to the ground through the actuator 1. When the power is turned off, the memory alloy drive wire recovers its deformation and is reset by the bias spring 16. When a voltage is applied to the positive and negative terminals of the actuator, current flows in from the positive terminal A and back from the negative terminal B, forming a current loop through the connected shape memory alloy drive wire, support sliding bar, and drive bar. The shape memory alloy drive wire, due to heat generation, contracts by 3.5%, and this displacement is superimposed on the actuator, causing it to move to its maximum limit. The left end of the actuator touches the upper left corner electrode post, triggering grounding and cutting off the power. No current flows through the shape memory alloy drive wire, which cools down and returns to its original length. Under the force of the bias spring, the actuator returns to its initial state.

Claims

1. A large-stroke grid driver using a shape memory alloy drive wire, characterized in that... The system includes a base (8), a cover plate (9), a drive bar (4), a support sliding bar (12), and a shape memory alloy drive wire. The base (8) has multiple sets of sliding grooves (26) arranged in parallel. The support sliding bar (12) has sliding buckles (25) that are slidably connected to the sliding grooves (26) via the sliding buckles (25). The drive bar (4) has one set, and the support sliding bar (12) has multiple sets. The multiple sets of support sliding bars (12) are connected by shape memory alloy drive wires. The two sides are connected end to end to form a support sliding group; the first end of the support sliding group is connected to the base (8) through a memory alloy drive wire, and the last end of the support sliding group is connected to the drive bar (4). The upper end of the drive bar (4) is provided with an actuator (1); the actuator (1), drive bar (4), support sliding bar (12) and memory alloy drive wire are electrically connected. When the memory alloy drive wire is energized, it contracts. The multiple memory alloy drive wires of the support sliding group contract and overlap to drive the drive bar (4) and actuator (1) to slide. When the memory alloy drive wire is de-energized, it stretches and recovers its deformation.

2. A large-stroke grid driver using a shape memory alloy drive wire according to claim 1, characterized in that, The end of the memory alloy drive wire is provided with a copper terminal. The copper terminal (15) is located at the contact connection between the memory alloy drive wire and the base (8), drive bar (4) or support sliding bar (12). The copper terminal (15) is in close contact with the base (8), drive bar (4) or support sliding bar (12).

3. A large-stroke grid driver using a shape memory alloy drive wire according to claim 1, characterized in that, The actuator (1) is provided with a contact (27) and a plug (28), and the base (8) is provided with two electrode posts (5), which are arranged at intervals. The actuator (1) is connected to the drive bar (4) through the plug (28). One end of the actuator (1) is connected to a bias spring (16), and the bias spring (16) is hooked to one of the electrode posts (5) of the base (8). The contact (27) is located at the other end of the actuator (1). The drive bar (4) drives the actuator (1) to slide along the interval between the two electrode posts (5). The contact (27) of the actuator (1) slides to the other electrode post (5) for a limited contact.

4. A large-stroke grid driver using a shape memory alloy drive wire according to claim 3, characterized in that... It also includes a lock cylinder (18) and a housing (19). The housing (19) is provided with two sets of through-hole slots (20). The lock cylinder (18) is divided into a lock pin (21), a latch plate (22), a return spring (23), and a snap-fit ​​plate (24). One end of the lock pin (21) is provided with a latch plate (22). The latch plate (24) and the return spring (23) are mounted on the lock pin (21). The other end of the lock pin (21) passes through the snap-fit ​​plate (24). The lock pin (21) passes into two sets of through-hole slots (20). The snap-fit ​​plate (24) and the return spring (23) are located between the two sets of through-hole slots (20). The return spring (23) applies force to press the snap-fit ​​plate (24) onto the through-hole slot (20). The contact of the actuator (1) is in contact with the latch plate (22). The actuator (1) drives the latch plate (22) of the lock cylinder (18) to move through the drive bar (4).

5. A large-stroke grid driver using a shape memory alloy drive wire according to claim 1, characterized in that, The drive bar (4) is provided in one group, and the support sliding bar (12) is provided in 7 groups; the memory alloy drive wire is divided into 8 wires, namely memory alloy drive wire I (13), memory alloy drive wire II (11), memory alloy drive wire III (10), memory alloy drive wire IV (14), memory alloy drive wire V (7), memory alloy drive wire VI (6), memory alloy drive wire VII (2), and memory alloy drive wire VIII (3); the 7 groups of support sliding bars (12) are connected end to end by memory alloy drive wire II (11), memory alloy drive wire III (10), memory alloy drive wire IV (14), memory alloy drive wire V (7), memory alloy drive wire VI (6), and memory alloy drive wire VII (2) to form a support sliding group; one end of the support sliding group is connected to the base (8) through memory alloy drive wire I (13), and the other end of the support sliding group is connected to the drive bar (4) through memory alloy drive wire VIII (3).

6. A large-stroke grid driver using a shape memory alloy drive wire according to claim 5, characterized in that, The base (8) is provided with 8 sets of sliding grooves (26), each set of sliding grooves (26) consists of 2 parallel sliding grooves, which are spaced apart.

7. A large-stroke grid driver using a shape memory alloy drive wire according to claim 1, characterized in that, The diameter of the memory alloy driving wire is 0.1 mm to 0.2 mm.

8. A large-stroke grid driver using a shape memory alloy drive wire according to claim 3, characterized in that, The base (8) is provided with a positive terminal A, a negative terminal B, a ground terminal C, an electrode post D and a copper terminal E. The base (8), the supporting sliding bar (12) and the driving bar (4) are provided with printed circuit boards. The printed circuit board of the base (8) is connected to the positive terminal A and the copper terminal E. The negative terminal B is provided with an electrode spring (17). The copper terminal E is electrically connected through the printed circuit board of the supporting sliding bar (12), the printed circuit board of the driving bar (4), the memory alloy driving wire and the printed circuit board of the execution piece (1). The electrode spring (17) is in contact with the execution piece (1) to connect the positive and negative circuits. The printed circuit board of the base (8) is connected to the ground terminal C and the electrode post D. The electrode post D is provided with an electrode post (5). The contact (27) of the execution piece (1) is connected to the electrode post (5) of the electrode post D and grounded. After the contact (27) is grounded, the positive and negative circuits are connected to the ground through the execution piece (1). The memory alloy driving wire is de-energized and recovers its deformation and is reset by the bias spring (16).

9. A large-stroke grid driver using a shape memory alloy drive wire according to claim 8, characterized in that, The supporting sliding bar (12), driving bar (4), and actuating plate (1) are made of high-nickel white copper sheet metal parts, and the high-nickel white copper sheet metal parts are provided with printed circuit boards, which are PCB circuit boards.

10. A large-stroke grid driver using a shape memory alloy drive wire according to claim 9, characterized in that, The electrode spring (17) is model FDX0033C2.

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