Resettable inflation release device

Abstract

The present invention discloses a resettable inflatable unlocking device. It comprises a cylinder body with a cavity structure, wherein the head end of the cylinder body is connected with an inflating hole, the tail end of the cylinder body is connected with a cylinder sleeve arranged coaxially with the cylinder body, a cylinder sleeve hole is provided on the end surface of the cylinder sleeve away from the bottom of the cylinder body, a pneumatic rod is arranged in the axial direction in the cavity formed by the cylinder body and the cylinder sleeve, and a locking rod is provided on the outer periphery of the pneumatic rod close to the cylinder sleeve end, the cylinder body comprises a first annular step, a second annular step and a third annular step; the pneumatic rod comprises a pneumatic rod head, a first annular boss, a first annular groove, a second annular boss and a pneumatic rod tail; the locking rod comprises a locking rod head and a locking rod tail, the outer wall of the locking rod head matches the inner cavity of the cylinder body, and the locking rod tail is partially located in the cylinder body cavity and partially extends out of the cylinder sleeve hole. The present invention is a purely mechanical structure design, and the unlocking function and the reuse function are realized through the mutual cooperation between the pneumatic rod and the locking rod.

Description

Technical Field

[0001] The invention relates to the technical field of spacecraft locking and unlocking, and in particular to a resettable inflatable unlocking device. Background Art

[0002] Spacecraft, also known as space vehicles or sky vehicles, are various types of aircraft that operate in the air according to the laws of celestial mechanics and perform specific tasks such as exploration and development. During the launch and flight of a spacecraft, many components must be in a folded and compressed state, but when the spacecraft reaches the predetermined orbit, these components are unlocked and deployed. The unlocking device has gradually developed with the development of on-orbit deployment and separation technology. It can not only realize the compression of spacecraft components, or the connection between spacecraft cabins and between two spacecraft, but also realize unlocking or separation according to specified requirements.

[0003] In the unlocked state, the outside of the unlocking device will be subjected to a certain preload force, and a small force needs to be applied inside the unlocking device to unlock the unlocking device. Usually, the unlocking is completed by using pyrotechnics inside the unlocking device, but this unlocking device has the following disadvantages: first, the unlocking device cannot be restored after being unlocked and can only be used once; second, the pyrotechnics used have certain safety hazards during random inspection; third, it takes a lot of cost to use the unlocking device for ground testing. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention proposes a resettable inflatable unlocking device, which adopts a purely mechanical structure. The outside of the unlocking device can withstand huge pulling force when it is unlocked. After unlocking, there is no need to replace parts and the unlocking device can be reused.

[0005] In order to achieve the above-mentioned purpose, the present invention is designed to provide a resettable inflatable unlocking device, comprising a cylinder body with a cavity structure, wherein the head end of the cylinder body is connected to an inflatable hole, the tail end of the cylinder body is connected to a cylinder sleeve arranged coaxially with the cylinder body, a cylinder sleeve hole is provided on the end surface of the cylinder sleeve away from the bottom of the cylinder body, a gas pressure rod is arranged in the axial direction in the cavity formed by the cylinder body and the cylinder sleeve, and a locking rod is sleeved on the outer periphery of the gas pressure rod close to the cylinder sleeve end, and the special features thereof are:

[0006] The cylinder body is provided with a first annular step, a second annular step and a third annular step in sequence from the position of the inflation hole to the tail end, and the diameter of the first annular step is larger than the diameter of the second annular step, and the diameter of the second annular step is larger than the diameter of the third annular step. The first annular step is penetrated by a plurality of first circular holes distributed along the radial direction, and a plug is provided in the first circular hole. The third annular step is penetrated by a plurality of second circular holes distributed along the radial direction, and a thrust tungsten ball is embedded in the second circular hole. A retaining ring sleeved on the outer periphery of the third annular step is provided on the outer side of the thrust tungsten ball, and the outer periphery of the retaining ring close to the second annular step side is in contact with the end face of the second annular step, and the retaining ring is fitted with a large spring sleeved on the outer periphery of the third annular step away from the end face of the second annular step, and the tail end of the large spring extends to the bottom end face of the cylinder sleeve;

[0007] The pneumatic rod is provided with a pneumatic rod head, a first annular boss, a first annular groove, a second annular boss and a pneumatic rod tail in sequence from the end far from the cylinder sleeve to the end close to the cylinder sleeve. A large sealing ring that fits tightly with the inner cavity of the cylinder body is provided on the outer periphery of the first annular boss. The second annular boss corresponds to the position of the first circular hole. A small spring is sleeved on the outer periphery of the pneumatic rod tail.

[0008] The locking rod is provided with a locking rod head and a locking rod tail in sequence from the end close to the pneumatic rod end to the end far away from the pneumatic rod end, the outer wall of the locking rod head matches the inner cavity of the cylinder body, and the outer wall of the locking rod tail matches the cylinder liner hole; the locking rod head is drilled with an axial recessed hole for embedding a second annular boss and a small spring, and the axial recessed hole corresponds to a plurality of third circular holes distributed radially on the outer wall of the second annular boss, and the third circular holes correspond to the first circular holes, and a self-locking tungsten ball is embedded in the third circular hole, and the inner side of the self-locking tungsten ball abuts against the second annular boss, and the outer side abuts against the plug, and the outer wall of the locking rod head is drilled with a second annular groove abutting against the thrust tungsten ball corresponding to the position of the thrust tungsten ball, and the tail of the locking rod is partially located in the cylinder cavity and partially extends out of the cylinder liner hole.

[0009] Furthermore, a buffer pad is arranged on the inner side of the cylinder sleeve away from the bottom end surface of the cylinder body.

[0010] Furthermore, the plug is connected to the first annular step via threads, a small sealing ring is provided at the plug port, and a contact surface between the plug and the self-locking tungsten ball is set as a conical surface.

[0011] Furthermore, a rolling inclined surface is provided between the second annular boss and the first annular groove to facilitate the rolling of the self-locking tungsten ball, and a vertical surface is provided between the second annular boss and the tail of the gas pressure rod.

[0012] Furthermore, the contact surface between the retaining ring and the thrust tungsten ball is an inclined surface, and the contact surface between the retaining ring and the large spring is a vertical surface.

[0013] Furthermore, the thrust of the small spring when it is fully compressed, the angle of the inclined surface of the contact between the retaining ring and the thrust tungsten ball, and the resistance of the large spring are set according to the pressure required for unlocking.

[0014] Furthermore, the cylinder sleeve hole has a non-circular structure along the radial cross section, which is used to prevent the locking rod and the cylinder sleeve from rotating relative to each other.

[0015] Furthermore, the axis of the first circular hole is staggered with the axis of the second circular hole.

[0016] Furthermore, the thrust of the small spring when it is fully compressed is smaller than the thrust required by the thrust tungsten ball to push the large spring.

[0017] Furthermore, the head of the gas pressure rod contacts the axial top end of the inner cavity of the cylinder body to ensure smooth air intake.

[0018] The advantages of the present invention are:

[0019] 1. The present invention is a purely mechanical structure design. Through the mutual cooperation between the gas pressure rod structure and the locking rod structure, when unlocked, the third circular hole on the locking rod and the second annular boss on the gas pressure rod are used to limit the radial movement of the self-locking tungsten ball. Even if the locking rod is subjected to external pulling force, it will not be pulled; when unlocked, because the locking rod is locked by the self-locking tungsten ball, the gas pressure rod transmits the thrust to the small spring, and the gas pushes the gas pressure rod to compress the small spring. After the small spring contacts the bottom of the axial concave hole on the locking rod, the self-locking tungsten ball moves radially to the inside, breaks away from the contact with the plug, and is placed in the first annular groove on the gas pressure rod, thus completing the initial unlocking; when the air pressure continues to increase to the set value, the locking rod continues to move toward the outside under the drive of the gas pressure rod, and squeezes the thrust tungsten ball radially outward. The thrust tungsten ball compresses the large spring through the retaining ring. When the thrust tungsten ball completely breaks away from the second annular groove on the locking rod, the tail of the locking rod is completely pushed out, completing the full unlocking;

[0020] 2. The unlocking air pressure in the present invention is adjusted by adjusting the thrust when the small spring is fully compressed, the angle of the contact slope between the retaining ring and the thrust tungsten ball, and the resistance of the large spring;

[0021] 3. The reset of the present invention is simple. After the pressure is completely released after unlocking, the locking rod is pushed toward the inflation hole until it is reset. At this time, the thrust tungsten ball will automatically retreat to the second annular groove on the locking rod under the push of the large spring. The gas pressure rod is pushed out by the small spring, and the self-locking tungsten ball is pushed along the rolling slope between the first annular groove and the second annular boss into the third circular hole on the locking rod, and then restored to the initial state, and can be reused.

[0022] 4. The present invention can be reset without disassembly or replacement of parts, thus improving the use efficiency;

[0023] The resettable inflatable unlocking device of the present invention is a purely mechanical structure design and does not need to be disassembled. Through the mutual cooperation between the pneumatic rod structure and the locking rod structure, the unlocking air pressure is used to adjust the thrust of the small spring when it is fully compressed, the inclined surface angle of the contact surface between the retaining ring and the thrust tungsten ball, and the resistance of the large spring, so as to realize the unlocking function and the reuse function and improve the use efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional exploded right side view of the resettable inflatable unlocking device of the present invention;

[0025] Figure 2 It is a three-dimensional exploded left view of the resettable inflatable unlocking device of the present invention;

[0026] Figure 3 It is a cross-sectional view of the resettable inflatable unlocking device of the present invention along the cross section of the self-locking tungsten ball in the locked state;

[0027] Figure 4 It is a cross-sectional view of the resettable inflatable unlocking device of the present invention along the cross section of the thrust tungsten ball during the unlocking process;

[0028] Figure 5 It is a cross-sectional view of the resettable inflatable unlocking device of the present invention along the cross section of the thrust tungsten ball in the unlocked state;

[0029] In the figure: cylinder body 1, cylinder sleeve 2, gas pressure rod 3, locking rod 4, retaining ring 5, small spring 6, large spring 7, plug 8, small sealing ring 9, large sealing ring 10, self-locking tungsten ball 11, thrust tungsten ball 12, buffer pad 13;

[0030] The cylinder body 1 comprises: a first annular step 1-1, a second annular step 1-2, a third annular step 1-3, a first circular hole 1-4, a second circular hole 1-5, and an air charging hole 1-6;

[0031] The cylinder liner 2 includes: a cylinder liner hole 2-1;

[0032] The gas rod 3 includes: a gas rod head 3-1, a first annular boss 3-2, a first annular groove 3-3, a second annular boss 3-4, a gas rod tail 3-5, and a rolling inclined surface 3-6;

[0033] The locking rod 4 includes: a locking rod head 4-1, a locking rod tail 4-2, an axial recessed hole 4-3, a third circular hole 4-4, and a second annular groove 4-5. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0035] In the description of the present invention, it is necessary to understand that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the invention.

[0036] like Figures 1 to 5 As shown, the resettable inflation unlocking device includes a cylinder body 1 with a cavity structure, the head end of the cylinder body 1 is connected to an inflation hole 1-6, the tail end of the cylinder body 1 is connected to a cylinder sleeve 2 arranged coaxially with the cylinder body 1, and a cylinder sleeve hole 2-1 is opened on the bottom end surface of the cylinder sleeve 2 away from the cylinder body 1, and a pneumatic rod 3 is arranged in the axial direction in the cavity formed by the cylinder body 1 and the cylinder sleeve 2, and a locking rod 4 is provided on the outer periphery of the pneumatic rod 3 close to the end of the cylinder sleeve 2.

[0037] Specifically, the cylinder body 1 is designed with an air charging hole 1 - 1 , one end of which is used for external fixed connection, and the other end is connected to the cylinder sleeve 2 .

[0038] The cylinder body 1 is provided with a first annular step 1-1, a second annular step 1-2 and a third annular step 1-3 in sequence from the position of the inflation hole 1-6 to the tail end, and the diameter of the first annular step 1-1 is larger than the diameter of the second annular step 1-2, and the diameter of the second annular step 1-2 is larger than the diameter of the third annular step 1-3. The first annular step 1-1 is penetrated by a plurality of first circular holes 1-4 distributed in the radial direction, and a plug 8 is provided in the first circular hole 1-4.

[0039] The third annular step 1-3 is penetrated by a plurality of second circular holes 1-5 distributed in the radial direction, a thrust tungsten ball 12 is embedded in the second circular hole 1-5, a retaining ring 5 which is sleeved on the outer periphery of the third annular step 1-3 is provided on the outer side of the thrust tungsten ball 12, the outer periphery of the retaining ring 5 close to the second annular step 1-2 side is in contact with the end face of the second annular step 1-2, the retaining ring 5 is fitted with a large spring 7 which is sleeved on the outer periphery of the third annular step 1-3 away from the end face of the second annular step 1-2, and the tail end of the large spring 7 extends to the bottom end face of the cylinder liner 2.

[0040] Specifically, the cylinder sleeve 2 and the second annular step 1 - 2 are connected by threads.

[0041] Several thrust tungsten balls 12 are evenly distributed along the circumference, have high strength, and can withstand greater pressure.

[0042] Specifically, the retaining ring 5 can move axially on the outer periphery of the third annular step 1-3, the contact surface between the retaining ring 5 and the thrust tungsten ball 12 is an inclined surface, and the contact surface between the retaining ring 5 and the large spring 7 is a vertical surface. The large spring 7 is axially limited by the retaining ring 5 and the bottom end surface of the cylinder sleeve 2, and radially limited by the inner wall of the cylinder sleeve 2 and the outer wall of the third annular step 1-3.

[0043] Specifically, a buffer pad 13 is provided on the inner side of the cylinder sleeve 2 away from the bottom end surface of the cylinder body 1 .

[0044] The pneumatic rod 3 is provided with a pneumatic rod head 3-1, a first annular boss 3-2, a first annular groove 3-3, a second annular boss 3-4 and a pneumatic rod tail 3-5 in sequence from the end farthest from the cylinder sleeve 2 to the end close to the cylinder sleeve 2. A large sealing ring 10 that fits tightly with the inner cavity of the cylinder body 1 is provided on the outer periphery of the first annular boss 3-2. The second annular boss 3-4 corresponds to the position of the first circular hole 1-4. A small spring 6 is sleeved on the outer periphery of the pneumatic rod tail 3-5.

[0045] Specifically, a rolling inclined surface 3-6 is provided between the second annular boss 3-4 and the first annular groove 3-3 to facilitate the rolling of the self-locking tungsten ball 11, and a vertical surface is provided between the second annular boss 3-4 and the tail portion 3-5 of the gas pressure rod.

[0046] The locking rod 4 is provided with a locking rod head 4-1 and a locking rod tail 4-2 in sequence from the end close to the pneumatic rod 3 to the end far away from the pneumatic rod 3. The outer wall of the locking rod head 4-1 matches the inner cavity of the cylinder body 1, and the outer wall of the locking rod tail 4-2 matches the cylinder sleeve hole 2-1. The locking rod head 4-1 is bored with an axial recessed hole 4-3 for embedding the second annular boss 3-4 and the small spring 6. The axial recessed hole 4-3 corresponds to a plurality of third circular holes 4-4 radially distributed on the outer wall of the second annular boss 3-4. The third circular holes 4-4 correspond to the first circular holes 1-4. A self-locking tungsten ball 11 is embedded in the third circular hole 4-4. The inner side of the self-locking tungsten ball 11 abuts against the second annular boss 3-4, and the outer side abuts against the plug 8. The outer wall of the locking rod head 4-1 is bored with a second annular groove 4-5 abutting against the thrust tungsten ball 12 corresponding to the position of the thrust tungsten ball 12. The locking rod tail 4-2 is partially located in the cavity of the cylinder body 1, and partially extends out of the cylinder liner hole 2-1.

[0047] The axial recessed hole 4-3 provided at the head 4-1 of the locking rod ensures that the pneumatic rod 3 can move a certain distance toward the locking rod. The small spring 6 is axially limited by the vertical plane between the axial recessed hole 4-3 and the second annular boss 3-4 and the tail 3-5 of the pneumatic rod, and radially limited by the axial recessed hole 4-3. When the pressure is fully released and reset, the small spring 6 can push the pneumatic rod 3 to ensure that the pneumatic rod 3 and the locking rod 4 are at a certain distance when not subject to external forces. In addition, the thrust of the small spring 6 when it is fully compressed is less than the thrust required for the thrust tungsten ball 12 to push the large spring 7.

[0048] Specifically, the cylinder liner hole 2 - 1 has a non-circular structure along the radial cross section, which is used to prevent the locking rod 4 and the cylinder liner 2 from rotating relative to each other.

[0049] The self-locking tungsten balls 11 are evenly distributed along the circumference, have high strength, and can withstand high pressure.

[0050] Preferably, the port of the plug 8 is equipped with a small sealing ring 9, and the contact surface between the plug 8 and the self-locking tungsten ball 11 is set to a conical surface. The small sealing ring 9 at the port of the plug 8 eliminates the gap between the plug 8 and the cylinder 1 to prevent gas leakage in the cavity of the cylinder 1. The number of the plugs 8 is consistent with the number of the self-locking tungsten balls 11. The plug 8 has a high strength and is connected to the first annular step 1-1 through a thread.

[0051] Preferably, the hole axes of the first circular holes 1-4 are staggered with the hole axes of the second circular holes 1-5.

[0052] Preferably, the pneumatic rod head 3-1 contacts the axial top end of the inner cavity of the cylinder body 1, and the axis of the push rod head 3-1 overlaps with the axis of the cylinder body 1 and the cylinder sleeve 2 to ensure smooth air intake.

[0053] The present invention is a purely mechanical structure design. Through the mutual cooperation between the gas pressure rod 3 structure and the locking rod 4 structure, when unlocked, the third circular hole 4-4 on the locking rod 4 and the second annular boss 3-4 on the gas pressure rod 3 are used to limit the radial movement of the self-locking tungsten ball 11. Even if the locking rod 4 is subjected to external tension, it will not be pulled. Figure 3 As shown; when unlocking, since the locking rod 4 is locked by the self-locking tungsten ball 11, the gas pressure rod 3 transmits the thrust to the small spring 6, and the gas pushes the gas pressure rod 3 to compress the small spring 6. After the small spring 6 contacts the bottom of the axial recessed hole 4-3 on the locking rod 4, the self-locking tungsten ball 11 moves radially to the inside, breaks away from the contact with the plug 8, and is placed in the first annular groove 3-3 on the gas pressure rod 3, thus completing the preliminary unlocking, as shown in FIG. Figure 4As shown; when the air pressure continues to increase to the set value, the locking rod 4 continues to move outward under the drive of the air pressure rod 3, and squeezes the thrust tungsten ball 12 radially outward. The thrust tungsten ball 12 compresses the large spring 7 through the retaining ring 5. When the thrust tungsten ball 12 completely disengages from the second annular groove 4-5 on the locking rod 4, the locking rod tail 4-2 is completely pushed out, and all unlocking is completed, as shown in FIG. Figure 5 shown.

[0054] The thrust of the small spring 6 when it is fully compressed, the angle of the contact slope of the retaining ring 5 and the thrust tungsten ball 12, and the resistance of the large spring 7 are set according to the pressure required for unlocking.

[0055] In addition, the unlocking air pressure in the present invention is adjusted by adjusting the thrust when the small spring 6 is fully compressed, the angle of the contact slope between the retaining ring 5 and the thrust tungsten ball 12 , and the resistance of the large spring 7 .

[0056] The present invention is simple to reset. After completely unlocking and releasing pressure, the locking rod 4 is pushed toward the inflation hole 1-6 until it is reset. At this time, the thrust tungsten ball 12 will automatically retreat to the second annular groove 4-5 on the locking rod 4 under the push of the large spring 7. The gas pressure rod 3 is pushed out by the small spring 6. The self-locking tungsten ball 11 is pushed along the rolling inclined surface 3-6 between the first annular groove 3-3 and the second annular boss 3-4 into the third circular hole 4-4 on the locking rod 4, and restored to the initial state, and can be reused. The present invention can complete the reset without disassembly and replacement of parts, thereby improving the use efficiency.

[0057] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A resettable inflatable unlocking device, comprising a cylinder body (1) with a cavity structure, wherein the head end of the cylinder body (1) is connected to an inflatable hole (1-6), the tail end of the cylinder body (1) is connected to a cylinder sleeve (2) arranged coaxially with the cylinder body (1), the cylinder sleeve (2) is provided with a cylinder sleeve hole (2-1) on the bottom end surface away from the cylinder body (1), a gas pressure rod (3) is arranged in the axial direction in the cavity formed by the cylinder body (1) and the cylinder sleeve (2), and a locking rod (4) is sleeved on the outer periphery of the gas pressure rod (3) close to the cylinder sleeve (2), Features: The cylinder body (1) is provided with a first annular step (1-1), a second annular step (1-2) and a third annular step (1-3) in sequence from the position of the inflation hole (1-6) to the tail end, and the diameter of the first annular step (1-1) is larger than the diameter of the second annular step (1-2), and the diameter of the second annular step (1-2) is larger than the diameter of the third annular step (1-3). The first annular step (1-1) is penetrated by a plurality of first circular holes (1-4) distributed in the radial direction, and a plug (8) is provided in the first circular hole (1-4). The third annular step (1-3) is penetrated by a plurality of first circular holes (1-4) distributed in the radial direction. A plurality of second circular holes (1-5) distributed in the radial direction are penetrated, a thrust tungsten ball (12) is embedded in the second circular hole (1-5), a retaining ring (5) sleeved on the outer periphery of the third annular step (1-3) is arranged outside the thrust tungsten ball (12), the outer periphery of the retaining ring (5) close to the second annular step (1-2) is in contact with the end face of the second annular step (1-2), the retaining ring (5) is in contact with a large spring (7) sleeved on the outer periphery of the third annular step (1-3) on the end face away from the second annular step (1-2), and the tail end of the large spring (7) extends to the bottom end face of the cylinder sleeve (2); The pneumatic rod (3) is provided with a pneumatic rod head (3-1), a first annular boss (3-2), a first annular groove (3-3), a second annular boss (3-4) and a pneumatic rod tail (3-5) in sequence from the end away from the cylinder sleeve (2) to the end close to the cylinder sleeve (2); a large sealing ring (10) which is tightly fitted with the inner cavity of the cylinder body (1) is provided on the outer periphery of the first annular boss (3-2); the second annular boss (3-4) corresponds to the position of the first circular hole (1-4); and a small spring (6) is sleeved on the outer periphery of the pneumatic rod tail (3-5); The locking rod (4) is provided with a locking rod head (4-1) and a locking rod tail (4-2) in sequence from the end close to the gas pressure rod (3) to the end far from the gas pressure rod (3); the outer wall of the locking rod head (4-1) matches the inner cavity of the cylinder body (1), and the outer wall of the locking rod tail (4-2) matches the cylinder sleeve hole (2-1); the locking rod head (4-1) is bored with an axial recessed hole (4-3) for internally accommodating the second annular boss (3-4) and the small spring (6); the axial recessed hole (4-3) corresponds to a plurality of radially distributed springs on the outer wall of the second annular boss (3-4). A third circular hole (4-4) is provided, the third circular hole (4-4) corresponding to the first circular hole (1-4), a self-locking tungsten ball (11) is embedded in the third circular hole (4-4), the inner side of the self-locking tungsten ball (11) abuts against the second annular boss (3-4), and the outer side abuts against the plug (8), a second annular groove (4-5) abutting against the thrust tungsten ball (12) is formed on the outer wall of the locking rod head (4-1) at a position corresponding to the thrust tungsten ball (12), and the tail portion (4-2) of the locking rod is partially located in the cavity of the cylinder body (1) and partially extends out of the cylinder sleeve hole (2-1).

2. The resettable inflatable unlocking device according to claim 1, Features: A buffer pad (13) is provided on the inner side of the cylinder sleeve (2) away from the bottom end surface of the cylinder body (1).

3. The resettable inflatable unlocking device according to claim 1, Features: The plug (8) is connected to the first annular step (1-1) via a threaded connection, a small sealing ring (9) is provided at the port of the plug (8), and the contact surface between the plug (8) and the self-locking tungsten ball (11) is set as a conical surface.

4. The resettable inflatable unlocking device according to claim 3, Features: A rolling inclined surface (3-6) is provided between the second annular boss (3-4) and the first annular groove (3-3) to facilitate the rolling of the self-locking tungsten ball (11), and a vertical surface is provided between the second annular boss (3-4) and the tail of the gas pressure rod (3-5).

5. The resettable inflatable unlocking device according to claim 4, Features: The contact surface between the retaining ring (5) and the thrust tungsten ball (12) is an inclined surface, and the contact surface between the retaining ring (5) and the large spring (7) is a vertical surface.

6. The resettable inflatable unlocking device according to claim 5, Features: The thrust of the small spring (6) when fully compressed, the angle of the contact slope between the retaining ring (5) and the thrust tungsten ball (12), and the resistance of the large spring (7) are set according to the pressure required for unlocking.

7. The resettable inflatable unlocking device according to claim 1, Features: The cylinder sleeve hole (2-1) has a non-circular structure along the radial cross section, and is used to prevent the locking rod (4) and the cylinder sleeve (2) from rotating relative to each other.

8. The resettable inflatable unlocking device according to claim 1, Features: The hole axis of the first circular hole (1-4) is staggered with the hole axis of the second circular hole (1-5).

9. The resettable inflatable unlocking device according to claim 1, Features: The thrust of the small spring (6) when it is fully compressed is smaller than the thrust required by the thrust tungsten ball (12) to push the large spring (7).

10. The resettable inflatable unlocking device according to claim 1, Features: The gas pressure rod head (3-1) contacts the axial top end of the inner cavity of the cylinder body (1), thereby ensuring smooth air intake.

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