A reusable release mechanism driven by SMA wire with self-resetting function

Abstract

The present invention discloses a reusable release mechanism with a self-resetting function driven by an SMA wire. The present invention adopts a structure with two-stage load reduction and one-stage release. The first-stage load reduction: the clamping rod and the hoop petal, the inclined block and the shell or the slider are all matched with inclined surfaces, which can effectively transfer most of the tension load of the clamping rod to the shell, and only a small part of the load is transferred to the thrust bearing. The second-stage load reduction: the ball in the thrust bearing is sprayed with a molybdenum disulfide lubricating coating, which can effectively reduce the friction, thereby reducing the torque transmitted to the drive shaft, and effectively bearing the axial load. The first-stage release: the drive shaft drives the thrust bearing to rotate a certain angle, so that the upper ring of the thrust bearing drops, releasing a certain axial clearance. This structure can greatly improve the load-bearing capacity of the mechanism and improve the reliability of the release. The present invention can achieve automatic resetting, release a large load, have strong vibration and impact resistance, and high stability.

Description

Technical Field

[0001] The invention relates to the technical field of spacecraft connection-separation mechanisms, and in particular to a reusable release mechanism driven by an SMA wire and having a self-resetting function. Background Art

[0002] Spacecraft require a variety of connection and separation mechanisms to achieve space connection and unlocking functions, such as the separation of multi-stage launch vehicles, the deployment of solar panels on satellites or spacecraft, etc. At present, most of these unlocking devices are pyrotechnic bolts (also known as explosive bolts). With the development of aerospace technology, especially the emergence of a new generation of small satellites, the impact and contamination problems caused by pyrotechnics are becoming more and more serious. One of the main focuses of solving this problem is to develop a new type of space unlocking mechanism using shape memory alloys (SMA).

[0003] In the development of new non-pyrotechnic unlocking mechanisms, there have been certain progress both at home and abroad, and a variety of design schemes using SMA drive have been proposed, such as the design scheme using SMA column as drive proposed by Hi Shear Technology Company in the United States, and the "SMA wire driven connection and unlocking mechanism" (patent application number: 200810119580.0) proposed by China. Among them, the "SMA wire driven connection and unlocking mechanism" uses SMA wire as the driving element, and its structure is as follows Figure 1 As shown, it is composed of an insulating bearing 1, an insulating fixing seat 2, a hoop 3, a housing 4, an insulating pulley 5, a split nut 6, a bolt 7, an end cover 8, a separation spring 9, a separation top block 10, an SMA wire 11 and a reset spring 12. The upper and lower end surfaces of the split nut 6 are respectively matched with the end cover 8 and the top block 10 with conical surfaces to form a complete thread pair, and the bolt 7 is screwed into the split nut 6. The upper end of the hoop 3 is matched with the end cover 8, and the lower end is tightened by the pre-compressed reset spring 12. The pre-stretched SMA wire 11 passes around the pulley 5 and the insulating bearing 1 and fixes the two ends to the ceramic support 2 and the hoop 3 respectively. Figure 1 The state shown is the unlocking process. When the SMA wire 11 is energized, the SMA wire 11 shrinks due to heat, pulling the hoop 3 downward and compressing the reset spring 12. When the hoop 3 moves to a certain position, the boss on the split nut 6 slides into the groove of the hoop 3 under the action of the separation spring 9, destroying the thread pair and causing the bolt 7 to come out of the split nut 6, thereby realizing the separation function of the mechanism. After the power is turned on, the temperature drops, and the low-temperature restoring force of the SMA wire 11 is less than the thrust of the reset spring 12. Under the action of the reset spring 12, the hoop 3 moves upward, re-stretching the SMA wire 11 and closing the split nut 6 again, thereby realizing the repeatable actuation function of the mechanism.

[0004] Although the "SMA wire-driven connection and unlocking mechanism" has advantages such as large margin and good synchronization, it also has fatal disadvantages: during the release process of the mechanism, there is sliding friction between the split nut and the hoop. When the release load is large, the friction resistance is also large, which in turn affects the SMA wire driving process, reduces the success rate of the release, and reduces the reliability, thus limiting the use of the release load. Summary of the invention

[0005] In view of this, the present invention provides a reusable release mechanism driven by an SMA wire and having a self-resetting function, which has a large release load, automatic resetting, strong impact resistance and high reliability.

[0006] The SMA wire-driven reusable release mechanism with self-resetting function of the present invention comprises, from bottom to top, an SMA driver assembly, a thrust bearing assembly, a tray assembly and a separation assembly; the exterior of the mechanism is encapsulated by a housing and a bottom cover;

[0007] The SMA driver assembly includes an SMA wire, a drive shaft, a return spring and a support frame; the drive shaft is mounted on the support frame; the SMA wire is wound around the drive shaft, and both ends are fixed on the support frame; the return spring is mounted on the tray nut, and the other end is mounted on the drive shaft;

[0008] The thrust bearing assembly is pressed on the support frame and connected to the drive shaft, and pits are evenly arranged on the raceway of the thrust bearing assembly;

[0009] The pallet assembly includes a pallet, a pallet spring, a pallet shaft, a pallet bracket and a pallet nut; wherein the pallet bracket is installed on the support frame; the pallet is installed on the pallet bracket through the pallet shaft and the pallet nut; the pallet spring is wound on the pallet shaft and is located between the pallet and the pallet bracket;

[0010] The separation component includes a clamping rod, a hoop petal and an inclined block; wherein, a boss is provided at one end of the clamping rod, the boss of the clamping rod is inserted into the hoop petal and is embraced by the hoop petal; the upper and lower ends of the hoop petal are in contact with the outer shell and the tray respectively; the inclined block is located between the hoop petal and the outer shell, and moves up and down along the inclined surface; the hoop petal and the inclined block are provided with symmetrical grooves on the contact surface.

[0011] In the present invention, the separation component is formed by a plurality of inclined surfaces cooperating to form a load-reducing structure, and the load on the clamping rod is reduced through two levels of inclined surfaces: the cooperating inclined surface between the clamping rod and the hoop petal, and the cooperating inclined surface between the inclined block and the housing or the slider. Most of the load is borne by the housing, and only a small part of the load acts on the thrust bearing. Such a design can greatly increase the locking load. The separation component adopts a locking method in which the hoop petal embraces the clamping rod, and unlocking and automatic resetting are achieved through the movement of the inclined block. When it is necessary to lock again, the inclined block remains stationary, and the hoop petal moves downward. The hoop petal moves outward along the cooperating inclined surface with the inclined block, so that the clamping rod can slide in. As the clamping rod slides in, the pressure of the clamping rod on the hoop petal disappears, and the hoop petal moves upward under the action of the tray spring to embrace the clamping rod. This structure can achieve quick installation and automatic resetting.

[0012] In the SMA driver assembly, the drive shaft can rotate in the groove of the support frame, and the SMA wire is heated by electricity, the SMA wire shrinks, and drives the drive shaft to rotate. When the SMA wire cools down, the drive shaft is reset under the action of the reset spring, and the SMA wire is stretched at the same time to prepare for the next drive. This structure can convert the linear motion of the SMA wire into rotational motion, so as to drive the thrust bearing to rotate.

[0013] When the thrust bearing assembly is locked, the ball falls into the raceway. When unlocking is required, the drive shaft drives the middle ring of the thrust bearing to rotate a certain angle, and the ball falls into the pit, causing the upper ring to drop a certain displacement, and then the inclined block to drop a certain displacement to achieve release. When the SMA wire cools, the drive shaft drives the middle ring of the thrust bearing to move under the action of the reset spring, so that the ball returns to the raceway of the middle ring to achieve reset. This structure is easy to release and reset.

[0014] Working process:

[0015] When the mechanism is unlocked, the SMA wire is electrically heated to shrink and drive the drive shaft to rotate. The drive shaft drives the thrust bearing to rotate, and the ball falls into the preset pit on the raceway, releasing a certain axial clearance. Under the action of pressure, the slider moves downward, the inclined block moves radially outward, and the hoop petals open to release the clamping rod.

[0016] When the mechanism automatically resets, after the SMA wire cools down, the drive shaft resets under the action of the reset spring, and the drive shaft drives the thrust bearing to rotate a certain angle. The ball slides from the pit to the raceway, eliminating the axial clearance, the slider moves upward, the inclined block moves radially inward, and the hoop petal moves radially inward to reset.

[0017] When the clamping rod is inserted and locked repeatedly, the hoop petals compress the tray spring through the tray under the action of pressure. After the hoop petals move downward, the radial limit of the hoop petals and the bevel block is eliminated, and the hoop petals open. As the clamping rod slides in, the pressure on the hoop petals is eliminated, and under the action of the tray spring, the hoop petals reset and hold the clamping rod tightly to achieve locking.

[0018] Preferably, the thrust bearing assembly is a double-row structure, and includes, from top to bottom, an upper ring, an upper row of balls, an upper retaining frame, a middle ring, a lower retaining frame, a lower row of balls and a lower ring; wherein the lower ring of the thrust bearing is pressed on the support frame, and the middle ring is connected to the drive shaft; pits are provided on the raceway of the middle ring, and the pits and the raceway are evenly spaced.

[0019] Preferably, the balls in the thrust bearing assembly are sprayed with a molybdenum disulfide lubricating coating, which can effectively reduce friction, thereby reducing the torque transmitted to the drive shaft and effectively bearing the axial load.

[0020] Preferably, the top of the shell is narrow at the top and wide at the bottom, and the side surface is an inclined surface, which matches the inclined surface of the inclined block; the inclined block slides up and down along the side surface of the shell.

[0021] Preferably, the separation assembly further comprises a sliding block, wherein the sliding block is mounted on the upper end surface of the thrust bearing assembly, the sliding block is provided with an inclined surface matching with the inclined block, and the inclined block slides up and down along the inclined surface of the sliding block.

[0022] Preferably, the sliding block is conical; the inclined surface of the inclined block is arranged at the bottom of the inclined block and cooperates with the sliding block.

[0023] Preferably, the sliding block passes through the inclined block.

[0024] Preferably, the bottom of the drive shaft is machined with a hexagonal groove, and the center of the bottom of the bottom cover is machined with a round hole. A hexagonal wrench can enter through the round hole, and then the drive shaft is rotated to achieve manual unlocking and resetting. This design allows for convenient unlocking and resetting without power supply.

[0025] Preferably, a square groove is processed on the side of the base, and a boss is processed on the side of the upper retainer, which is inserted into the square groove of the base. The upper retainer can be rotated by the boss to achieve manual unlocking and resetting without affecting the SMA driver assembly.

[0026] Beneficial effects:

[0027] The present invention can effectively solve the problems of low impact resistance, small release load, difficult reset, low reliability, etc. of the existing locking and releasing mechanism, and can realize automatic reset, large release load, strong vibration and impact resistance, etc., which are specifically manifested in the following aspects:

[0028] (1) The present invention adopts a two-stage load reduction and one-stage release structure. The first stage load reduction: the clamping rod and the hoop petal, the inclined block and the outer shell or the slider are all matched with inclined surfaces, which can effectively transfer most of the tension load of the clamping rod to the shell, and only a small part of the load is transferred to the thrust bearing. The second stage load reduction: the ball in the thrust bearing is sprayed with a molybdenum disulfide lubricating coating, which can effectively reduce the friction, thereby reducing the torque transmitted to the drive shaft and effectively bearing the axial load. The first stage release: the drive shaft drives the thrust bearing to rotate a certain angle, so that the upper circle of the thrust bearing drops, releasing a certain axial clearance. This structure can greatly improve the load-bearing capacity of the mechanism, while improving the reliability of the release.

[0029] (2) The re-locking release assembly of the present invention adopts an automatic reset mode. After the SMA wire is heated and released by electricity, as the SMA wire cools, the restoring force of the spring is greater than the tension of the SMA wire, and the spring drives the drive shaft to rotate, so that the ball moves from the pit in the thrust bearing to the raceway, thereby eliminating the axial clearance and achieving automatic reset. This method avoids repeated installation of the release structure and is easy to use.

[0030] (3) The present invention adopts a fast-insertion installation method for the clamping rod. When re-locking is required, the clamping rod is inserted from the release structure, and the hoop petals move downward with the clamping rod and move outward along the mating surface with the inclined block, so that the clamping rod can slide into the hoop petal groove. As the clamping rod slides in, the hoop petals move upward under the action of the tray spring and re-hold the clamping rod. This design greatly simplifies the installation process of the clamping rod, so that the mechanism can be used for repeated locking of spacecraft in orbit.

[0031] (4) The present invention adopts a method of releasing the drive shaft by rotation. By designing that the SMA wire is wound around the pulley and the drive shaft, when the SMA wire contracts, it drives the drive shaft to rotate, converting the linear motion into rotational motion, which greatly saves the space and weight of the mechanism.

[0032] (5) The present invention adopts two sets of SMA wire driving devices to achieve a redundant design, which can successfully unlock the door even if one set of SMA wire fails, thereby improving the reliability of release. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the structure of the connection and unlocking mechanism driven by the existing SMA wire;

[0034] Figure 2 Schematic diagram of the release mechanism of the present invention, wherein (a) is the locked state, and (b) is the unlocking process state;

[0035] Figure 3 It is a schematic diagram of the structure of the release mechanism of the present invention;

[0036] Figure 4Schematic diagram of the structure of a thrust bearing assembly, wherein (a) is a locked state, and (b) is an unlocking process state;

[0037] Figure 5 This is a schematic diagram of the deep and shallow groove structure of the thrust bearing center ring;

[0038] Figure 6 It is a schematic diagram of the structure of the SMA actuator assembly;

[0039] Figure 7 This is a schematic diagram of the installation of the drive shaft and support frame;

[0040] Figure 8 This is a schematic diagram of the manual unlocking structure of the drive shaft and housing;

[0041] Fig. 9 Alternative solution 1 for separating components;

[0042] Fig.10 Alternative solution 2 for separating components;

[0043] Fig.11 Alternative solution 3 for separating components;

[0044] Fig.12 To change the plug-in clamping connection to a threaded connection;

[0045] Fig.13 An alternative solution for SMA wire installation.

[0046] Among them, 1-housing; 2-pressing rod; 3-hoop petal; 4-oblique block; 5-slider; 6-tray; 7-tray spring; 8-tray shaft; 9-tray bracket; 10-tray nut; 11-reset spring; 12-driving shaft; 13-SMA wire; 14-support frame; 15-thrust bearing upper ring; 16-upper row of balls; 17-upper retaining frame; 18-thrust bearing middle ring; 19-lower retaining frame; 20-lower row of balls; 21-thrust bearing lower ring; 22-bottom cover. DETAILED DESCRIPTION

[0047] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0048] The specific structure of the present invention is as follows Figure 3As shown, the releaser can be divided into four components: SMA driver component, thrust bearing component, tray component, and separation component. Among them, the SMA driver component is composed of SMA wire 13, support frame 14, drive shaft 12, and reset spring 11; the thrust bearing component is composed of thrust bearing upper ring 15, upper row of balls 16, upper retainer 17, thrust bearing middle ring 18, lower retainer 19, lower row of balls 20, and thrust bearing lower ring 21; the tray component is composed of tray 6, tray spring 7, tray shaft 8, tray bracket 9, and tray nut 10; the separation component is composed of clamping rod 2, hoop petal 3, inclined block 4, and slider 5; the outside of the mechanism is encapsulated by shell 1 and bottom cover 22.

[0049] like Figure 3 As shown, the SMA wire 13 is passed around the drive shaft 12, the drive shaft 12 is assembled in the groove of the support frame and can rotate at a certain angle, and the support frame 14 is assembled on the bottom cover 22. At the same time, the thrust bearing structure is as shown in FIG. Figure 4 As shown, from top to bottom, there are thrust bearing upper ring 15, upper row of balls 16, upper retainer 17, thrust bearing middle ring 18, balls 21, lower retainer 22, and thrust bearing lower ring 21; the thrust bearing lower ring is pressed on the support frame 14, and the drive shaft 12 is connected to the thrust bearing middle ring 18, which can drive the drive bearing middle ring to rotate. At the same time, the tray bracket 9 is also installed on the support frame 14 by screws, the tray shaft 8 is installed on the tray bracket 9 by the tray nut 10, and the reset spring 11 is installed on the tray nut 10, and the other end is installed on the drive shaft 12 for resetting the drive shaft 12. One end of the tray spring 7 is pressed on the tray bracket 9, and the other end is pressed on the tray 6. The retainer spring 16 is installed on the tray bracket 9, and the other end is installed on the upper retainer 17 for fixing the upper retainer 17. The separation component is installed on the thrust bearing upper ring 15.

[0050] The locking state of the self-resetting release is as follows: Figure 2 As shown in (a), when unlocking is required, the SMA wire 13 is electrically heated, and the SMA wire 13 contracts to drive the drive shaft 12 to rotate, and the drive shaft 12 drives the thrust bearing middle ring 18 to rotate, and the upper row of balls 16 and the lower row of balls 20 fall into the deep groove 18-Ⅰ of the thrust bearing middle ring 18, and the thrust bearing upper ring 15 drops a certain displacement, as shown in FIG. Figure 2As shown in (b), the slider 5 then moves down a certain displacement under the pressure of the inclined block 4, and the inclined block 4 moves radially outward under the action of the hoop petal 3, and the constraint of the hoop petal 3 on the clamping rod 2 is released, and the clamping rod 2 is separated under the tension. When the SMA wire 13 cools down, the tension of the SMA wire decreases, and under the action of the reset spring 11, the drive shaft 12 is reset, and the thrust bearing middle ring 17 is driven to reset at the same time, and the upper row of balls 16 and the lower row of balls 20 move from the deep groove 18-Ⅰ of the thrust bearing middle ring 17 to the shallow groove 18-II, and the thrust bearing upper ring 15 moves upward accordingly, and the slider 5 moves upward accordingly, and the inclined block 4 moves radially inward, and the hoop petal 3 is reset.

[0051] The process of locking the clamping rod of the self-resetting releaser is the reverse process of the unlocking process. Figure 2 As shown in (b) to 2(a), the clamping rod 2 is inserted into the mechanism. Under the action of the clamping rod 2, the hoop petal 3 moves downward with the clamping rod 2, and the tray spring 7 is compressed by the tray 6. Due to the action of the matching groove, the radial constraint of the bevel block 4 on the hoop petal 3 disappears, the hoop petal 3 moves to both sides, and the pressure of the clamping rod 2 on the hoop petal 3 disappears. Due to the action of the matching groove, the radial constraint of the bevel block 4 on the hoop petal 3 disappears, the hoop petal 3 moves to both sides, and the pressure of the clamping rod 2 on the hoop petal 3 disappears. Under the action of the tray 6, the hoop petal 3 moves upward and inward at the same time, hugging the clamping rod 2 to achieve locking.

[0052] like Figure 4 and Figure 5 As shown, the present invention draws on the structure of the thrust bearing, and on this basis, the ball groove of the thrust bearing middle ring 18 is improved to a structure of deep groove 18-Ⅰ and shallow groove 18-II interlaced, wherein the shallow groove can be the original rolling groove, and the deep groove is a set pit. When release is required, the thrust bearing middle ring rotates a certain angle under the action of the drive shaft, and the upper row of balls 16 and the lower row of balls 20 roll from the shallow groove 18-II into the deep groove 18-I to achieve the release of the axial clearance. When automatically resetting, the drive shaft 12 drives the thrust bearing middle ring 18 to rotate back to a certain angle, and under the action of the upper retainer 17, the balls roll from the deep groove 18-I of the thrust bearing middle ring 18 to the shallow groove 18-II to eliminate the axial clearance.

[0053] like Figure 6 and Figure 7 As shown, the SMA driver assembly consists of a reset spring 11, a drive shaft 12, an SMA wire 13, and a support frame 14. The two ends of the two groups of SMA wires 13 are fixed to the support frame and bypass the drive shaft 12. The drive shaft 12 is assembled in the groove of the support frame and can rotate at a certain angle.

[0054] like Fig. 9 As shown, a circular hole is punched in the center of the bottom of the bottom cover 15, and a hexagonal groove is provided at the bottom of the driving shaft 12. The driving shaft 12 can be manually rotated by a hexagonal wrench to achieve manual unlocking and resetting.

[0055] Obviously, the described embodiments are only some implementation examples of the present invention, rather than all implementation examples, and the SMA driver assembly, the thrust bearing assembly, the tray assembly and the separation assembly all have alternative solutions.

[0056] Taking the separation component as an example, three alternative solutions can be proposed. Solution 1 is as follows: Fig.11 As shown, the inclined block 4 and the slider 5 are combined into one part, and the housing with an inclined surface cooperates with the inclined block to realize the inclined block moving along the inclined direction to release the radial constraint. Fig.12 As shown, the shape of the slider 5 is set to be conical, and the inclined block 4 is changed to four cylindrical sliders. The conical slider 5 moves downward, and the cylindrical slider 4 moves outward to release the hoop petal 3. Scheme 3 is as follows Fig.13 As shown, the slider 5 passes through the interior of the inclined block 4, and the inclined surface inside the inclined block 4 cooperates with the inclined surface of the slider 5. When the slider 5 moves downward, the inclined block 4 moves outward to release the hoop petal 3. It should be pointed out that the above multiple replaceable methods are not all implementation examples, and solutions that can be easily thought of by designers in this field, such as changing the shape and size of the inclined block and the slider, and combining the two parts into one, should all be within the protection scope of the present invention.

[0057] In the present invention, the pressing rod 2 and the separation structure adopt a pluggable connection method, which can be replaced by a threaded connection, such as Fig.12 The SMA wire installation method of the SMA actuator assembly in the present invention is not unique and can be replaced by Fig.13 The above changes should also be within the protection scope of the present invention.

[0058] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A reusable release mechanism driven by an SMA wire with a self-resetting function, characterized in that: The interior of the mechanism includes, from bottom to top, an SMA driver assembly, a thrust bearing assembly, a tray assembly, and a separation assembly; the exterior of the mechanism is encapsulated by a housing (1) and a bottom cover (22); The SMA driver assembly comprises an SMA wire (13), a driving shaft (12), a reset spring (11) and a support frame (14); the driving shaft (12) is mounted on the support frame (14); the SMA wire (13) is wound around the driving shaft (12), and both ends are fixed on the support frame (14); the reset spring (11) is mounted on the tray nut (10), and the other end is mounted on the driving shaft (12); The thrust bearing assembly is pressed on the support frame (14) and connected to the drive shaft (12), and pits are evenly arranged on the raceway of the thrust bearing assembly; The tray assembly comprises a tray (6), a tray spring (7), a tray shaft (8), a tray bracket (9) and a tray nut (10); wherein the tray bracket (9) is mounted on a support frame (14); the tray (6) is mounted on the tray bracket (9) via the tray shaft (8) and the tray nut (10); the tray spring (7) is wound around the tray shaft (8) and is located between the tray (6) and the tray bracket (9); The separation component comprises a clamping rod (2), a hoop petal (3) and an inclined block (4); wherein a boss is provided at one end of the clamping rod (2), the boss of the clamping rod (2) is inserted into the hoop petal (3) and is embraced by the hoop petal (3); the upper and lower ends of the hoop petal (3) are in contact with the outer shell (1) and the tray (6) respectively; the inclined block (4) is located between the hoop petal (3) and the outer shell (1) and moves up and down along the inclined surface; the hoop petal (3) and the inclined block (4) are provided with symmetrical grooves on the contact surface.

2. The SMA wire driven reusable release mechanism with self-resetting function as claimed in claim 1, characterized in that: The thrust bearing assembly is a double-row structure, and comprises, from top to bottom, an upper ring (15), an upper row of balls (16), an upper retaining frame (17), a middle ring (18), a lower retaining frame (19), a lower row of balls (20) and a lower ring (21); wherein the thrust bearing lower ring (21) is pressed on the support frame (14), and the middle ring (18) is connected to the drive shaft (12); pits are arranged on the raceway of the middle ring (18), and the pits and the raceway are evenly spaced.

3. The SMA wire driven reusable release mechanism with self-resetting function as claimed in claim 1 or 2, characterized in that: The balls in the thrust bearing assembly are sprayed with a molybdenum disulfide lubricating coating.

4. The SMA wire driven reusable release mechanism with self-resetting function as claimed in claim 1, characterized in that: The top of the shell (1) is narrow at the top and wide at the bottom, and the side surface is an inclined surface that matches the inclined surface of the inclined block (4); the inclined block (4) slides up and down along the side surface of the shell (1).

5. The SMA wire driven reusable release mechanism with self-resetting function as claimed in claim 1, characterized in that: The separation assembly also includes a slider (5), which is mounted on the upper end surface of the thrust bearing assembly. The slider (5) is provided with an inclined surface that matches the inclined block (4), and the inclined block (4) slides up and down along the inclined surface of the slider (5).

6. The SMA wire driven reusable release mechanism with self-resetting function as claimed in claim 5, characterized in that: The sliding block (5) is conical; the inclined surface of the inclined block (4) is arranged at the bottom of the inclined block (4) and matches with the sliding block (5).

7. The SMA wire driven reusable release mechanism with self-resetting function as claimed in claim 5, characterized in that: The sliding block (5) passes through the inclined block (4).

8. The SMA wire driven reusable release mechanism with self-resetting function as claimed in claim 1, characterized in that: There are two sets of SMA actuator assemblies.

9. The reusable release mechanism driven by an SMA wire with a self-resetting function as claimed in any one of claims 1 to 8, characterized in that: The bottom center of the bottom cover (22) is punched with a circular hole, and the bottom of the driving shaft (12) is provided with a hexagonal groove for manually rotating the driving shaft (12).

10. The reusable release mechanism driven by an SMA wire with a self-resetting function as claimed in any one of claims 1 to 8, characterized in that: A boss is machined on the side of the thrust bearing assembly; and a corresponding groove is provided on the side of the bottom cover (22) for manual unlocking and resetting.

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