Separation unlocking mechanism driven by shape memory alloy wire

Abstract

The invention provides a separating and unlocking mechanism driven by a shape memory alloy wire, and relates to the technical field of separating and unlocking mechanisms, the separating and unlocking mechanism comprises a base, a sectioning nut, a limiting assembly, a trigger switch assembly and a connecting piece, and the base is used for being fixedly connected with a first separating piece; a plurality of sliding surfaces are sequentially arranged on the base around a circumference, the plurality of split nuts are respectively arranged on the sliding surfaces in a sliding manner, and the split nuts slide on the sliding surfaces to realize aggregation and separation; the limiting assembly can be arranged on the periphery of the split nut and limit the split nut so that the split nut can be in a polymerization state, and the limiting assembly has the trend of being far away from the split nut in the axial direction. The trigger switch assembly can limit the limiting assembly to be away from the split nut. The trigger end of the trigger switch assembly is made of shape memory alloy, and limitation on the limiting assembly is relieved by electrifying and heating the trigger end; the bearing and response time of the separation device can be prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of separation and unlocking mechanisms, and in particular to a separation and unlocking mechanism driven by a shape memory alloy wire. Background Art

[0002] The separation unlocking device is a device used to fasten the fixed structure to the movable structure and release the constraint after receiving the separation command. The separation unlocking device is a very important device on the spacecraft, which directly affects the success of the spacecraft launch, especially during the rocket launch and the operation of spacecraft components. Although the traditional pyrotechnic device has mature technology, reliable process and fast unlocking speed, it also has some shortcomings, such as separation shock, smoke pollution, non-recyclability and damage to precision instruments on the spacecraft.

[0003] Low-impact release and unlocking mechanisms refer to release and unlocking mechanisms that are not driven by pyrotechnics. Among them, the performance of low-impact release and unlocking mechanisms driven by shape memory alloys (SMA) is better than other release and unlocking mechanisms that are not driven by pyrotechnics, and has become a hot topic of international research in recent years. SMA has the characteristics of high energy density and large deformation recovery performance. Compared with traditional pyrotechnic devices, SMA release and unlocking mechanisms have obvious advantages in low impact, large load, fast response and synchronization. Moreover, SMA has a compact structure and can be reused for a long time, which means that they can play a role in multiple tasks, thus saving costs and resources.

[0004] However, the prior art solution of using shape memory alloy to directly drive the limit assembly to move requires a huge trigger force. The trigger force required by the shape memory alloy wire is positively correlated with its size. A too large shape seriously affects the heating time. Therefore, a new solution is urgently needed to solve the above problem. Summary of the invention

[0005] The object of the present invention is to provide a separation and unlocking mechanism driven by a shape memory alloy wire to solve the problems existing in the above-mentioned prior art and to improve the load-bearing capacity and response time of the separation device.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The present invention provides a separation and unlocking mechanism driven by a shape memory alloy wire, comprising:

[0008] A base, the base being used for fixed connection with the first separation member;

[0009] There are multiple split nuts, the base is provided with multiple sliding surfaces in sequence around a circumference, the multiple split nuts are respectively slidably arranged on the sliding surfaces, and the split nuts slide on the sliding surfaces to achieve aggregation and separation;

[0010] A limiting component, which can be arranged at the periphery of the split nut and limit the split nut to make it in a gathered state, and the limiting component has a tendency to move away from the split nut along the axial direction;

[0011] A trigger switch assembly, wherein the trigger switch assembly can limit the limit assembly to be away from the split nut; the trigger end of the trigger switch assembly is made of shape memory alloy, and the limit on the limit assembly is released by heating the trigger end through power;

[0012] A connecting piece, one end of which is provided with an external thread matching the plurality of split nuts, and the connecting piece is used for fixed connection with the second separating piece.

[0013] Preferably, the limiting assembly is in the shape of a sleeve as a whole and can be moved away from the split nut along the axial direction;

[0014] The trigger switch assembly comprises:

[0015] A stop ball, a stop groove is provided on the wall surface of the limit assembly, and the stop ball can be located in the stop groove and put the limit assembly in a locked state;

[0016] A support member, the support member is fixedly arranged on the outer side of the stop groove, a limiting hole is provided on the support member, when the limit assembly is in a locked state, the limiting hole is directly opposite to the stop groove, and the limiting hole is used to accommodate part of the stop and limit the axial movement freedom of the stop ball;

[0017] A locking slider, the locking slider is located at a side of the limiting hole away from the stopping groove and can limit the stopping ball from escaping from the stopping groove;

[0018] a first elastic member, wherein the first elastic member applies a force to the locking slider to keep the locking slider at the outer side of the limiting hole;

[0019] A shape memory alloy wire is connected to the locking slider. When the temperature state of the shape memory alloy wire changes, the shape memory alloy wire adjusts its own length to drive the locking slider to overcome the elastic force of the first elastic member so that the locking slider is away from the limiting hole.

[0020] Preferably, the limiting assembly comprises a limiting sleeve and a second elastic member, and the second elastic member can be pre-compressed or stretched to give the limiting assembly a force away from the split nut.

[0021] Preferably, the sliding surface is an inclined plane, and the bottom of the split nut is provided with an inclined surface that fits with the sliding surface.

[0022] Preferably, the first elastic member and the second elastic member are both springs.

[0023] Preferably, the limit assembly also includes a locking ball, an annular locking protrusion is arranged on the outer wall surface of the split nut, and a ball groove is arranged on the inner wall of the sleeve, and the ball groove is used to arrange the locking ball. The locking ball can roll freely in the ball groove, and in the locked state, the part of the locking ball protruding from the ball groove abuts against the locking protrusion and causes the split nut to converge; when the sleeve moves away from the split nut axially, the sleeve drives the locking ball to move away from the locking protrusion.

[0024] Preferably, one end of the locking protrusion facing the moving direction of the locking ball is chamfered.

[0025] Preferably, a guide sliding block is arranged on the sliding surface, and a sliding groove is arranged at the bottom of the split nut, and the sliding groove cooperates with the guide sliding block.

[0026] Preferably, it also includes a release spring and a release block, wherein the release block is arranged on a side of the split nut away from the base, the release block can move axially along the split nut, the release spring is arranged on the side of the release block away from the split nut, the side of the split nut facing the release block is a conical surface, and the release block also has a conical surface facing the split nut, and the release block has a tendency to move toward the split nut under the elastic force of the release spring.

[0027] Preferably, it also includes an outer cylinder, and the base, the split nut, the release block, the support member, the locking slider, and the first elastic member are arranged in the sleeve in sequence, and a plurality of reset holes are opened on the sleeve, some of the reset holes are connected to the space where one end of the sleeve is located, and some of the reset holes are connected to the space where the locking slider is located.

[0028] Compared with the prior art, the present invention has achieved the following technical effects:

[0029] In the solution provided by the present invention, the limit assembly is configured to have a tendency to move away from the split nut along the axial direction, that is, an elastic member is provided as a power to release the radial limit of the split nut, and then a trigger switch assembly is configured to release the axial restriction of the limit assembly. The trigger force required to release the axial limit of the limit assembly is relatively small, much smaller than the force required to release the radial limit of the split nut. Therefore, the present invention helps to reduce the trigger force required for the separation and unlocking mechanism to release the locked state, thereby reducing the diameter or cross-sectional size of the shape memory alloy wire, and improving the load-bearing and response time of the separation device. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 A top view of a separation and unlocking mechanism driven by a shape memory alloy wire provided in an embodiment of the present invention;

[0032] Figure 2 for Figure 1 Middle AA section view;

[0033] Figure 3 for Figure 1 Middle BB section view;

[0034] Figure 4 is a schematic diagram of the base structure;

[0035] Figure 5 It is a schematic diagram of the structure of the split-flap nut;

[0036] Figure 6 It is a schematic diagram of the locking slider structure;

[0037] Figure 7 for Figure 6 A top view of

[0038] In the figure: 1-connecting piece; 2-second separating piece; 3-first separating piece; 4-base; 5-first split nut; 6-second split nut; 7-third split nut; 8-locking ball; 9-left sleeve; 10-release block; 11-release spring; 12-second elastic piece; 13-right sleeve; 14-locking slider; 15-first elastic piece; 16-support piece; 17-insulating sleeve; 18-shape memory alloy wire; 19-outer cylinder; 20-stop ball; 21-guide slider; 22-sliding surface; 23-bottom surface; 24-limiting groove; 25-sleeve guide block; 26-slide groove; 27-chamfered structure; 28-perforation; 29-guide block; 30-trapezoidal ring groove; 31-split nut. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] When the polymerized split nut is connected with a connecting piece, the connecting piece applies radial pressure to the split nut, so that the split nut applies radial pressure to the limit assembly. Under this pressure, the limit assembly needs a greater force to move axially away from the split nut. Therefore, if the deformation of the shape memory alloy wire is directly used to drive the limit assembly to move, a larger shape memory alloy wire is required as a driver. Based on this, in order to solve this problem, the present invention provides the following embodiments.

[0042] The present invention provides a separation and unlocking mechanism driven by a shape memory alloy wire, such as Figure 1 to Figure 7As shown, it includes: a base 4, a split nut 31, a limit assembly, a trigger switch assembly and a connecting piece 1; the base 4 is used to be fixedly connected to the first separating piece 3; there are multiple split nuts 31, and the base 4 is sequentially provided with multiple sliding surfaces 22 around a circle, and the multiple split nuts 31 can be slidably arranged on the sliding surfaces 22, and the split nuts 31 slide on the sliding surfaces 22 to achieve aggregation and separation; the limit assembly can be arranged on the periphery of the split nut 31 and limit the split nut 31 to make it in an aggregated state, and the limit assembly has a tendency to move away from the split nut 31 along the axial direction; the trigger switch assembly can limit the limit assembly from moving away from the split nut 31; the trigger end of the trigger switch assembly is made of shape memory alloy, and the limit on the limit assembly is released by heating the trigger end with electricity; one end of the connecting piece 1 is provided with an external thread matching the multiple split nuts 31, and the connecting piece 1 is used to be fixedly connected to the second separating piece 2.

[0043] The first separation piece 3 and the second separation piece 2 in this embodiment are components to be separated or combined, which are only briefly illustrated in the figure and do not represent the actual shapes of the components.

[0044] This embodiment configures the limit assembly to have a tendency to move axially away from the split nut 31, that is, an elastic member is provided as a power to release the radial limit of the split nut 31, and then a trigger switch assembly is configured to release the axial restriction of the limit assembly. The trigger force required to release the axial limit of the limit assembly is relatively small, much smaller than the force required to release the radial limit of the split nut 31. Therefore, the present invention helps to reduce the trigger force required for the separation and unlocking mechanism to release the locked state, thereby reducing the diameter or cross-sectional size of the shape memory alloy wire 18, and improving the load-bearing and response time of the separation device.

[0045] The trigger switch assembly in the present invention is configured to release the axial restriction of the limit assembly. Specifically, the limit assembly is sleeve-shaped as a whole and can be moved away from the split nut 31 along the axial direction.

[0046] The trigger switch assembly includes: a stop ball 20, a support member 16, a locking slider 14, a first elastic member 15 and a shape memory alloy wire 18. A stop groove is provided on the wall surface of the limit assembly, and the stop ball 20 can be located in the stop groove and make the limit assembly in a locked state; the support member 16 is fixedly arranged on the outer side of the stop groove, and a limit hole is provided on the support member 16. When the limit assembly is in a locked state, the limit hole is directly opposite to the stop groove, and the limit hole is used to accommodate part of the stop and limit the axial movement freedom of the stop ball 20; the locking slider 14 is located on the side of the limit hole away from the stop groove and can limit the stop ball 20 from escaping from the stop groove; the first elastic member 15 gives the locking slider 14 a force to keep it on the outer side of the limit hole; the shape memory alloy wire 18 is connected to the locking slider 14. When the shape memory alloy wire 18 changes its own temperature state, it adjusts its own length and drives the locking slider 14 to overcome the elastic force of the first elastic member 15 so that the locking slider 14 is away from the limit hole.

[0047] In the trigger switch assembly provided in this embodiment, since the limit assembly only applies axial or vertical force to the stop ball 20, under ideal conditions, the stop ball 20 exerts no pressure or very little pressure on the locking slider 14 in the radial or lateral direction, which weakens the force required to drive the locking slider 14 to move, thereby reducing the diameter or cross-sectional size of the shape memory alloy wire 18 and improving the load-bearing and response time of the separation device.

[0048] It should be noted that the shape memory alloy wire 18 needs to connect the locking slider 14 and a fixed structure. When the shape memory alloy wire 18 is heated and shortened, it will pull the locking slider 14 to move in a predetermined direction. Specifically, Figure 7 As shown, the locking slider 14 is provided with two through holes 28, and the shape memory alloy wire 18 passes through the two through holes 28 in sequence. The two ends of the shape memory alloy wire 18 are respectively fixedly connected to a fixed structure, such as the outer cylinder 19 in the following embodiment, and extend out of the device to facilitate connection with the external power system. In this way, when the shape memory alloy wire 18 is heated to a certain degree by electricity, the shape memory alloy wire 18 shortens and drives the locking slider 14 to move upward to compress the first elastic member 15 and release the stop ball 20 from the stop groove. The limit assembly, which has a tendency to move away from the split nut 31 along the axial direction, will automatically move in a direction away from the split nut 31 and release the radial restriction on the split nut 31 after losing the axial constraint.

[0049] Preferably, there are three split nuts 31 , namely a first split nut 5 , a second split nut 6 and a third split nut 7 .

[0050] In some embodiments, the limiting assembly includes a limiting sleeve and a second elastic member 12 , and the second elastic member 12 can be pre-compressed or stretched to provide a force for the limiting assembly to move away from the split nut 31 .

[0051] This embodiment provides a specific structure of the limiting assembly, wherein the second elastic member 12 is configured to provide a force for the limiting sleeve to move away from the split nut 31 so that the limiting sleeve has a tendency to move away from the split nut 31. It can be understood that no matter what the setting method is, as long as the second elastic member 12 can provide the corresponding force, Figure 2 and 3 As shown, the side of the limiting sleeve away from the split nut 31 is provided with an annular outer edge extending outward, the second elastic member 12 is a spring and is sleeved on the limiting sleeve, one end of the second elastic member 12 is against the base 4, and the other end is against the annular outer edge. Under normal conditions (i.e., in the locked state), the second elastic member 12 is in a compressed state to apply a force to the limiting sleeve in a direction away from the split nut 31.

[0052] In some embodiments, the limit assembly also includes a locking ball 8, an annular locking protrusion is provided on the outer wall surface of the split nut 31, and a ball groove is provided on the inner wall of the sleeve, in which the locking ball 8 is provided. The locking ball 8 can roll freely in the ball groove. In the locked state, the part of the locking ball 8 protruding from the ball groove abuts against the locking protrusion and causes the split nut 31 to aggregate; when the sleeve moves axially away from the split nut 31, the sleeve drives the locking ball 8 to move away from the locking protrusion.

[0053] In this embodiment, a locking ball 8 is provided as a force transmission structure between the split nut 31 and the limiting sleeve to eliminate the friction force of the split nut 31 on the limiting sleeve. It can be understood that when the locking ball 8 is not provided, the split nut 31 directly contacts the inner wall of the limiting sleeve, and there is a large friction between the two, which is not conducive to the axial movement of the limiting sleeve. A larger spring is required to provide a force to overcome the large friction. However, this embodiment eliminates this defect, and the locking ball 8 can roll freely, which greatly reduces the driving force required for the axial movement of the limiting sleeve.

[0054] On the basis of the above-mentioned embodiments, in order to facilitate the resetting of the locking ball 8, in some embodiments, one end of the locking protrusion facing the moving direction of the locking ball 8 is chamfered to form a chamfered structure 27. This arrangement is to facilitate the resetting of the locking ball 8 and the limiting sleeve. Specifically, when resetting, there is no need to disassemble, reset, and install the entire device. Only one end of the limiting sleeve needs to be pressed, and the limiting sleeve drives the locking ball 8 to move down along the chamfered surface until it rests on the locking protrusion to complete the resetting process.

[0055] In some embodiments, the limiting sleeve is a left-right split structure, which divides the limiting sleeve into a left sleeve 9 and a right sleeve 13. The left sleeve 9 and the right sleeve 13 are connected by bolts. This is to facilitate the processing of the limiting sleeve structure itself and the initial installation of the locking ball 8 between the limiting sleeve and the split nut 31.

[0056] In some embodiments, the sliding surface 22 is an inclined plane, and the bottom of the split nut 31 is provided with an inclined surface that fits with the sliding surface 22 .

[0057] In this embodiment, the bottom surface 23 of the split nut 31 and the top surface of the base 4 are designed to be flat rather than conical surfaces, so that the split nut 31 and the base 4 are in flat contact during separation to reduce friction (if it is a conical surface, the split nut 31 and the base 4 will be in line contact during the separation process, resulting in greater friction), which is more conducive to separation. Figure 3 As shown, the split nut 31 is as shown in Figure 4 shown.

[0058] In some embodiments, a guide slide block 21 is disposed on the sliding surface 22 , and a slide groove 26 is disposed at the bottom of the split nut 31 , and the slide groove 26 cooperates with the guide slide block 21 .

[0059] This embodiment is to achieve the aggregation and separation of the split nut 31 more stably.

[0060] In some embodiments, the first elastic member 15 and the second elastic member 12 are both springs.

[0061] In order to facilitate the automatic separation of the split nut 31, in some embodiments, the embodiments of the present invention also include a release spring 11 and a release block 10. The release block 10 is arranged on the side of the split nut 31 away from the base 4. The release block 10 can move axially along the split nut 31. The release spring 11 is arranged on the side of the release block 10 away from the split nut 31. The side of the split nut 31 facing the release block 10 is a conical surface, and the release block 10 facing the split nut 31 is also a conical surface. Under the elastic force of the release spring 11, the release block 10 has a tendency to move toward the split nut 31.

[0062] In this embodiment, under the elastic force of the spring, the release block 10 pushes the multiple split nuts 31 to separate radially. It can be understood that when resetting the split nuts 31 in this embodiment, it is necessary to overcome the elastic force of the spring before resetting.

[0063] In some embodiments, the structure of the locking slider 14 is as follows: Figure 6 and Figure 7 As shown, a trapezoidal annular groove 30 is provided at the lower part thereof to accommodate the stop ball 20, and the stop ball 20 is pushed into the stop groove when the locking slider 14 moves downward.

[0064] In some embodiments, the outer wall of the locking slider 14 is provided with a guide block 29 extending along the axial direction, and the guide block 29 cooperates with the guide structure on the support member 16 to enable the locking slider 14 to move only along the axial direction.

[0065] In some embodiments, the embodiments of the present invention also include an outer cylinder 19, a base 4, a split nut 31, a release block 10, a support member 16, a locking slider 14, and a first elastic member 15 which are sequentially arranged in the sleeve, and a plurality of reset holes are opened on the sleeve, some of the reset holes are connected to the space where one end of the sleeve is located, and some of the reset holes are connected to the space where the locking slider 14 is located.

[0066] The outer cylinder 19 in this embodiment plays a role in protecting the entire device.

[0067] The reset hole is provided to facilitate resetting the component. Specifically, the reset rod is extended into the reset hole connected to the space where the limit sleeve is located. The reset rod moves toward the limit sleeve and compresses the second elastic member 12 until the locking ball 8 abuts against the outer wall of the locking protrusion and maintains this state. Then, other reset rods are used to extend into the reset hole connected to the space where the locking slider 14 is located. The reset rod moves toward the locking slider 14 and allows the stop ball 20 to enter the stop groove. This process will cause the shape memory alloy wire 18 to deform. The deformed shape memory alloy wire 18 and the first elastic member 15 will maintain the axial position of the locking slider 14, thereby completing the reset.

[0068] Taking into account that the above process requires manual hand-held reset rod to maintain the state of compressing the second elastic member 12 until the locking ball 8 abuts against the outer wall of the locking protrusion, in order to solve this problem, in some embodiments, the reset hole or the through hole on the support member 16 is set as a threaded hole. With this setting, the limit sleeve is pressed down by a reset rod with a thread (a bolt can also be used). After being pressed into place, the threaded pair will maintain this state. After the reset is completed, the reset rod with a thread can be unscrewed from the device.

[0069] This embodiment can achieve resetting through three resetting holes, thus reducing the number of parts, reducing the complexity of parts, and making the structure simpler.

[0070] In some embodiments, an insulating sleeve 17 is nested inside the outer cylinder 19 , and other components are disposed inside the insulating sleeve 17 .

[0071] In some embodiments, a sleeve guide block 25 is further provided on the top of the base 4 to guide the limiting sleeve.

[0072] Working principle during locking: the first elastic member 15 applies axial constraints to the locking slider 14, and the support member 16 applies radial constraints to the locking slider 14; the stop ball 20 and the locking slider 14 apply axial constraints to the limiting sleeve; the limiting sleeve and the six locking balls 8 thereon apply radial constraints to the three petal nuts 31, limiting the radial opening of the petal nuts 31; the connecting member 1 tightens the first separating member 3 and the second separating member 2 by threads.

[0073] Working principle during release: the shape memory alloy wire 18 is electrically heated to a temperature above the phase transition start temperature, the shape memory alloy wire 18 begins to shrink, the locking slider 14 is axially displaced upward to the limit position, and the radial constraint on the stop ball 20 is released. After the radial constraint of the stop ball 20 is released, the axial constraint of the limit sleeve is also released, and the limit sleeve and the six locking balls 8 are axially displaced upward to the limit position under the action of the second elastic member 12, and the radial constraint on the split nut 31 is released. Under the dual force of the connector 1 and the release block 10 and the constraint of the slide groove 26, the split nut 31 opens radially to achieve the release of the connector 1.

[0074] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A separation and unlocking mechanism driven by a shape memory alloy wire, Features: include: A base, the base being used for fixed connection with the first separation member; There are multiple split nuts, the base is provided with multiple sliding surfaces in sequence around a circumference, the multiple split nuts are respectively slidably arranged on the sliding surfaces, and the split nuts slide on the sliding surfaces to achieve aggregation and separation; A limiting component, which can be arranged at the periphery of the split nut and limit the split nut to make it in a gathered state, and the limiting component has a tendency to move away from the split nut along the axial direction; A trigger switch assembly, wherein the trigger switch assembly can limit the limit assembly to be away from the split nut; the trigger end of the trigger switch assembly is made of shape memory alloy, and the limit on the limit assembly is released by heating the trigger end through power; A connecting piece, one end of which is provided with an external thread matching the plurality of split nuts, and the connecting piece is used for fixed connection with the second separating piece.

2. The shape memory alloy wire driven separation and unlocking mechanism according to claim 1, Features: The limiting assembly is in the shape of a sleeve as a whole and can be axially away from the split nut; The trigger switch assembly comprises: A stop ball, a stop groove is provided on the wall surface of the limit assembly, and the stop ball can be located in the stop groove and put the limit assembly in a locked state; A support member, the support member is fixedly arranged on the outer side of the stop groove, a limiting hole is provided on the support member, when the limit assembly is in a locked state, the limiting hole is directly opposite to the stop groove, and the limiting hole is used to accommodate part of the stop and limit the axial movement freedom of the stop ball; A locking slider, the locking slider is located at a side of the limiting hole away from the stopping groove and can limit the stopping ball from escaping from the stopping groove; a first elastic member, wherein the first elastic member applies a force to the locking slider to keep the locking slider at the outer side of the limiting hole; A shape memory alloy wire is connected to the locking slider. When the temperature state of the shape memory alloy wire changes, the shape memory alloy wire adjusts its own length to drive the locking slider to overcome the elastic force of the first elastic member so that the locking slider is away from the limiting hole.

3. The shape memory alloy wire driven release and unlocking mechanism according to claim 2, Features: The limiting assembly includes a limiting sleeve and a second elastic member, and the second elastic member can be pre-compressed or stretched to give the limiting assembly a force away from the split nut.

4. The shape memory alloy wire driven release and unlocking mechanism according to claim 1, Features: The sliding surface is an inclined plane, and the bottom of the split nut is provided with an inclined surface that fits with the sliding surface.

5. The shape memory alloy wire driven separation and unlocking mechanism according to claim 3, Features: The first elastic member and the second elastic member are both springs.

6. The shape memory alloy wire driven separation and unlocking mechanism according to claim 3, Features: The limit assembly also includes a locking ball, an annular locking protrusion is arranged on the outer wall surface of the split nut, and a ball groove is arranged on the inner wall of the sleeve, and the locking ball is arranged in the ball groove. The locking ball can roll freely in the ball groove. In the locked state, the part of the locking ball protruding from the ball groove abuts against the locking protrusion and causes the split nut to converge; when the sleeve moves away from the split nut axially, the sleeve drives the locking ball to move away from the locking protrusion.

7. The shape memory alloy wire driven release and unlocking mechanism according to claim 6, Features: One end of the locking protrusion facing the moving direction of the locking ball is chamfered.

8. The shape memory alloy wire driven separation and unlocking mechanism according to claim 4, Features: A guide slide block is arranged on the sliding surface, and a slide groove is arranged at the bottom of the split nut, and the slide groove cooperates with the guide slide block.

9. The shape memory alloy wire driven separation and unlocking mechanism according to claim 3, Features: It also includes a release spring and a release block, wherein the release block is arranged on a side of the split nut away from the base, the release block can move axially along the split nut, the release spring is arranged on the side of the release block away from the split nut, the side of the split nut facing the release block is a conical surface, and the release block also has a conical surface facing the split nut, and the release block has a tendency to move toward the split nut under the elastic force of the release spring.

10. The shape memory alloy wire driven separation and unlocking mechanism according to claim 9, Features: It also includes an outer cylinder, and the base, the split nut, the release block, the support member, the locking slider, and the first elastic member are arranged in the sleeve in sequence. A plurality of reset holes are opened on the sleeve, some of the reset holes are communicated with the space where one end of the sleeve is located, and some of the reset holes are communicated with the space where the locking slider is located.

Images