Inflatable unlocking device

Abstract

The inflatable unlocking device of the present invention comprises a cylinder body and a cylinder sleeve, a push rod is arranged in the axial direction in the cavity formed by the cylinder body and the cylinder sleeve, a pull rod is arranged on the outer circumference of the push rod near the cylinder sleeve end, the push rod is provided with a push rod head, a first annular boss, a second annular boss, a first annular groove, a third annular boss and a push rod tail in sequence from the end away from the cylinder sleeve end to the end close to the cylinder sleeve end, the pull rod is drilled with a first concave hole, a second concave hole and a third concave hole, the first concave hole matches the second annular boss, the second concave hole corresponds to a plurality of circular holes distributed radially on the outer wall of the pull rod, a tungsten ball is embedded in the circular hole, and a shear pin is radially penetrated at the position of the push rod tail located outside the cylinder sleeve hole. The present invention is a purely mechanical structure design, does not need to be disassembled, and realizes the unlocking function and the reuse function by cooperating with the push rod structure and the pull rod structure, and adjusting the shear strength of the shear pin by using the unlocking air pressure, thereby improving the use efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of spacecraft locking and unlocking, and in particular to an 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 an 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, only simple parts need to be replaced and the unlocking device can be reused.

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

[0006] The push rod is provided with a push rod head, a first annular boss, a second annular boss, a first annular groove, a third annular boss and a push rod tail in sequence from the end away from the cylinder liner to the end close to the cylinder liner. A sealing ring is provided on the outer periphery of the first annular boss to fit tightly with the inner cavity of the cylinder body. The diameter of the second annular boss is smaller than that of the first annular boss. The push rod tail is partially located in the cavity formed by the cylinder body and the cylinder liner, and partially extends out of the cylinder liner hole.

[0007] The pull rod is successively drilled with a first concave hole, a second concave hole and a third concave hole from the end close to the cylinder block to the end far from the cylinder block. The first concave hole matches the second annular boss. A plurality of circular holes distributed radially penetrate through the outer wall of the pull rod corresponding to the second concave hole, and tungsten balls are embedded in the circular holes. The inner side of the tungsten ball abuts against the third annular boss, the outer side of the tungsten ball is embedded at the junction of the cylinder block and the cylinder liner, the third concave hole matches the tail of the push rod, and a cavity is arranged between the bottom of the third concave hole and the end face of the tail of the push rod. The outer diameter of the outer wall of the pull rod corresponding to the second concave hole is larger than the inner diameter of the cylinder liner hole, and the outer wall of the pull rod corresponding to the third concave hole matches the cylinder liner hole.

[0008] A shear pin penetrates through the tail of the push rod radially at a position outside the cylinder liner hole, the shear pin extends to the outer wall of the pull rod, and the shear strength of the shear pin is a set value.

[0009] A first exhaust hole penetrates through the tail of the push rod radially. The first exhaust hole is located inside the shear pin and can be pushed to the outside of the cylinder liner hole as the shear pin is cut off. A second exhaust hole penetrates through the outer wall of the pull rod corresponding to the third concave hole radially, and the second exhaust hole corresponds to the position of the first exhaust hole.

[0010] Further, a third exhaust hole penetrates through the cylinder wall of the cylinder liner radially, and the third exhaust hole corresponds to the position of the second exhaust hole.

[0011] Furthermore, the first exhaust hole is a circular hole, the second exhaust hole is an oval hole, the third exhaust hole is an oval hole, the major radius of the third exhaust hole is not less than the major radius of the second exhaust hole, and the major radius of the second exhaust hole is not less than the diameter of the first exhaust hole.

[0012] Furthermore, the cylinder liner is successively drilled with a first step groove and a second step groove from the end close to the cylinder block to the end far from the cylinder block. The cylinder liner is connected to the cylinder block through the first step groove. The transition position between the first step groove and the second step groove is in direct contact with the tungsten ball, and the transition position between the first step groove and the second step groove is set as an inclined surface. The second step groove extends to the end face of the cylinder liner far from the cylinder block.

[0013] Furthermore, a buffer pad is arranged on the inner side of the bottom end face of the cylinder liner far from the cylinder block.

[0014] Furthermore, the first step groove is connected to the outer periphery of the cylinder block through a thread.

[0015] Further, the radial cross-section of the second annular boss is a non-circular structure for preventing relative rotation between the push rod and the pull rod.

[0016] Furthermore, the radial cross-section of the cylinder liner hole is a non-circular structure for preventing relative rotation between the pull rod and the cylinder liner.

[0017] Furthermore, a rolling inclined surface is provided between the third annular boss and the first annular groove to facilitate the rolling of the tungsten ball.

[0018] Furthermore, the push rod head (3-1) contacts the axial top end of the inner cavity of the cylinder body (1), thereby ensuring smooth air intake.

[0019] The advantages of the present invention are:

[0020] 1. The present invention is a purely mechanical structure design. Through the mutual cooperation of the push rod structure and the pull rod structure, when unlocked, the third annular boss on the push rod is used to limit the radial movement of the tungsten ball, and the pull rod will not be pulled even if it is subjected to external pulling force; when unlocked, since the pull rod is locked by the tungsten ball, the push rod transmits the thrust to the shear pin. When the gas pressure reaches the shear strength setting value of the shear pin, the shear pin is sheared off, and the gas pressure pushes the push rod to move toward the cavity. The tungsten ball is subjected to the combined force of the pull rod and the cylinder sleeve, and moves radially to the inside and is placed in the first annular groove, thus completing the unlocking;

[0021] 2. The unlocking air pressure in the present invention can be adjusted by adjusting the shear strength of the shear pin;

[0022] 3. The reset of the present invention is simple. After completely unlocking and releasing the pressure, first push the pull rod back to its position, then use the second exhaust hole and the first exhaust hole to reset the push rod, and the tungsten ball will also be reset at the same time. Finally, replace the new shear pin and it can be reused.

[0023] 4. The present invention can be reset without disassembly, thus improving the use efficiency;

[0024] The inflatable unlocking device of the present invention is a purely mechanical structure design and does not need to be disassembled. Through the mutual cooperation of the push rod structure and the pull rod structure, the unlocking air pressure is used to adjust the shear strength of the shear pin to achieve the unlocking function and the reuse function, thereby improving the use efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a three-dimensional exploded right side view of the inflation unlocking device of the present invention;

[0026] Figure 2 It is a three-dimensional exploded left view of the inflation unlocking device of the present invention;

[0027] Figure 3 It is a cross-sectional view of the inflation unlocking device of the present invention along the axial direction in a locked state;

[0028] Figure 4 for Figure 3 AA direction cross-sectional view;

[0029] Figure 5 It is a cross-sectional view of the inflation unlocking device of the present invention along the axial direction in the unlocked state;

[0030] In the figure: cylinder body 1, cylinder sleeve 2, push rod 3, pull rod 4, tungsten ball 5, sealing ring 6, shear pin 7, buffer pad 8, cavity 9;

[0031] The cylinder body 1 includes: an air charging hole 1-1;

[0032] The cylinder liner 2 includes: a first step groove 2-1, a second step groove 2-2, a cylinder liner hole 2-3, and a third exhaust hole 2-4;

[0033] The push rod 3 includes: a push rod head 3-1, a first annular boss 3-2, a second annular boss 3-3, a first annular groove 3-4, a third annular boss 3-5, a push rod tail 3-6, a first exhaust hole 3-7, and a rolling inclined surface 3-8;

[0034] The pull rod 4 includes: a first concave hole 4-1, a second concave hole 4-2, a third concave hole 4-3, a round hole 4-4, and a second exhaust hole 4-5. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0036] 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.

[0037] Example 1

[0038] like Figures 1 to 5 As shown, the 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 1-1, the tail end is connected to a cylinder sleeve 2 arranged coaxially with the cylinder body 1, and the cylinder sleeve 2 is provided with a cylinder sleeve hole 2-3 on the end surface away from the cylinder body 1; a push rod 3 is arranged in the axial direction in the cavity formed by the cylinder body 1 and the cylinder sleeve 2, and a pull rod 4 is provided on the outer periphery of the push rod 3 close to the end of the cylinder sleeve 2.

[0039] Specifically, the cylinder body 1 is designed with an air filling hole 1 - 1 , one end of which is used for external fixed connection, and the other end is connected to the cylinder sleeve 2 through a thread.

[0040] The push rod 3 is provided with a push rod head 3-1, a first annular boss 3-2, a second annular boss 3-3, a first annular groove 3-4, a third annular boss 3-5 and a push rod tail 3-6 in sequence from the end farthest from the cylinder liner 2 to the end close to the cylinder liner 2. The outer periphery of the first annular boss 3-2 is provided with a sealing ring 6 that fits tightly with the inner cavity of the cylinder body 1. The diameter of the second annular boss 3-3 is smaller than the diameter of the first annular boss 3-2. Part of the push rod tail 3-6 is located in the cavity formed by the cylinder body 1 and the cylinder liner 2, and part of it extends out of the cylinder liner hole 2-3.

[0041] The push rod head 3-1 contacts the top axial 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, ensuring smooth air intake. The gas enters the cylinder body 1 through the inflation hole 1-1, and the air pressure acts on the push rod 3, and the gap between the push rod 3 and the cylinder body 1 is eliminated through the sealing ring 6 on the push rod 3 to prevent gas leakage.

[0042] Preferably, the second annular boss 3 - 3 is a non-circular structure along the radial cross section, so as to prevent the push rod 3 and the pull rod 4 from rotating relative to each other.

[0043] The pull rod 4 is sequentially bored with a first recessed hole 4-1, a second recessed hole 4-2 and a third recessed hole 4-3 from the end close to the cylinder body 1 to the end far from the cylinder body 1, the first recessed hole 4-1 matches the second annular boss 3-3, the second recessed hole 4-2 corresponds to a plurality of circular holes 4-4 radially distributed on the outer wall of the pull rod 4, a tungsten ball 5 is embedded in the circular hole 4-4, the inner side of the tungsten ball 5 abuts against the third annular boss 3-5, the outer side of the tungsten ball 5 is embedded at the junction of the cylinder body 1 and the cylinder liner 2, the third recessed hole 4-3 matches the push rod tail 3-6, and a cavity 9 is provided between the bottom of the third recessed hole 4-3 and the tail end face of the push rod tail 3-6; the outer diameter of the outer wall of the pull rod 4 corresponding to the second recessed hole 4-2 is larger than the inner diameter of the cylinder liner hole 2-3, the outer wall of the pull rod 4 corresponding to the third recessed hole 4-3 matches the cylinder liner hole 2-3.

[0044] The first concave hole 4-1, the second concave hole 4-2 and the third concave hole 4-3 opened inside the pull rod 4 are stepped, and correspond to the second annular boss 3-3, the third annular boss 3-5 and the push rod tail 3-6 on the push rod 3. The push rod 3 extends into the pull rod 4 through the designed third annular boss 3-5 to limit the radial movement of the tungsten ball 5. There are multiple tungsten balls 5 evenly distributed along the circumference, which have high strength and can withstand high pressure.

[0045] The push rod tail 3-6 is located outside the cylinder liner hole 2-3 and is radially penetrated by a shear pin 7, which extends to the outer wall of the pull rod 4, and the shear strength of the shear pin 7 is a set value. The shear strength of the shear pin 7 determines the air pressure required for unlocking.

[0046] The cylinder liner 2 is sequentially formed with a first step groove 2-1 and a second step groove 2-2 from the end close to the cylinder body 1 to the end far from the cylinder body 1. The cylinder liner 2 is connected to the cylinder body 1 via the first step groove 2-1. The transition position between the first step groove 2-1 and the second step groove 2-2 is in direct contact with the tungsten ball 5. The transition position between the first step groove 2-1 and the second step groove 2-2 is set as an inclined surface. The second step groove 2-2 extends to the end surface of the cylinder liner 2 away from the cylinder body 1.

[0047] The contact portion between the tungsten ball 5 and the cylinder sleeve 2 is designed as an inclined surface, which is used to limit the tungsten ball 5 on the one hand, and can generate reverse thrust when the tungsten ball 5 is subjected to force on the other hand, so as to push the tungsten ball 5 to move radially inward.

[0048] Specifically, the first step groove 2 - 1 is connected to the outer periphery of the cylinder body 1 through threads.

[0049] Preferably, a buffer pad 8 is provided on the inner side of the cylinder sleeve 2 away from the bottom end surface of the cylinder body 1 to reduce the impact of the pull rod 4 on the cylinder sleeve 2 after unlocking.

[0050] Preferably, the cylinder liner hole 2 - 3 has a non-circular structure along the radial cross section, so as to prevent the pull rod 4 and the cylinder liner 2 from rotating relative to each other.

[0051] When unlocked, the cylinder body 1 is fixed in the working state, and the pull rod 4 is subjected to the outer pulling force, which drives the tungsten ball 5 to move outward. At this time, the tungsten ball 5 is limited by the inclined surface at the transition position of the first step groove 2-1 and the second step groove 2-2 and the third annular boss 3-5 and cannot move, that is, the pull rod 4 will not be pulled. Figure 3 shown.

[0052] When gas is filled into the inflation hole 1-1 of the cylinder body 1, the sealing ring 6 ensures that the gas will not leak out, and the push rod 3 is subjected to the thrust of the gas. Since the pull rod 4 is locked by the tungsten ball 5, the push rod 3 transmits the thrust to the shear pin 7. When the gas pressure reaches the shear strength setting value of the shear pin 7, the shear pin 7 is sheared off, and the gas pressure pushes the push rod 3 toward the cavity 9 until it presses against the bottom end of the third recessed hole 4-3; at the same time, the tungsten ball 5 is subjected to the combined force of the pull rod 4 and the cylinder sleeve 2, and the tungsten ball 5 moves radially to the inside and is placed in the first annular groove 3-4. The limit of the tungsten ball 5 by the third annular boss 3-5 is released, and the unlocking is completed at this time. After the push rod 3 axially contacts the pull rod 4, it drives the pull rod 4 to move outward together until the outer wall of the second recessed hole 4-2 corresponding to the pull rod 4 contacts the buffer pad 8, and the third recessed hole 4-3 is completely pushed out. Figure 5 shown.

[0053] In addition, after the present invention is unlocked, it can be reused by simply replacing simple parts.

[0054] Preferably, the push rod tail 3-6 is radially penetrated by a first exhaust hole 3-7, which is located on the inner side of the shear pin 7 and can be pushed to the outer side of the cylinder liner hole 2-3 as the shear pin 7 is sheared; the third recessed hole 4-3 corresponds to the outer wall of the pull rod 4 on which a second exhaust hole 4-5 is radially penetrated, and the second exhaust hole 4-5 corresponds to the position of the first exhaust hole 3-7.

[0055] Preferably, a rolling inclined surface 3 - 8 is provided between the third annular boss 3 - 5 and the first annular groove 3 - 4 to facilitate the rolling of the tungsten ball 5 .

[0056] After fully unlocking and relieving the pressure, the cylinder sleeve 2 can be unscrewed from the cylinder body 1, the pull rod 4 can be pushed toward the inflation hole 1-1 and pushed back to the initial position, and then a thin rod can be used to extend from the second exhaust hole 4-5 on the pull rod 4, push the first exhaust hole 3-7, push the push rod 3 back to the initial position, and the tungsten ball 5 can roll to the initial position along the rolling inclined surface 3-8. Finally, replace the new shear pin 7 and it can be reused.

[0057] The present invention is a purely mechanical structure design. Through the mutual cooperation of the push rod structure and the pull rod structure, when unlocked, the third annular boss on the push rod is used to limit the radial movement of the tungsten ball, and the pull rod will not be pulled even if it is subjected to external pulling force; when unlocked, the pull rod is locked by the tungsten ball, and the push rod transmits the thrust to the shear pin. When the gas pressure reaches the shear strength setting value of the shear pin, the shear pin is sheared, and the gas pressure pushes the push rod to move toward the cavity. The tungsten ball is subjected to the combined force of the pull rod and the cylinder sleeve, and moves radially to the inside and is placed in the first annular groove, thereby completing the unlocking.

[0058] Example 2

[0059] The difference between Example 2 and Example 1 is that the first step groove 2 - 1 is fixedly connected to the outer periphery of the cylinder body 1 , and at this time, the cylinder sleeve 2 cannot be unscrewed from the cylinder body 1 .

[0060] The cylinder wall of the cylinder sleeve 2 is radially penetrated with a third exhaust hole 2-4, and the third exhaust hole 2-4 corresponds to the position of the second exhaust hole 4-5.

[0061] Specifically, the first exhaust hole 3-7 is a circular hole, the second exhaust hole 4-5 is an elliptical hole, the third exhaust hole 2-4 is an elliptical hole, and the long radius of the third exhaust hole 2-4 is not less than the long radius of the second exhaust hole 4-5, and the long radius of the second exhaust hole 4-5 is not less than the diameter of the first exhaust hole 3-7.

[0062] After fully unlocking and releasing the pressure, push the pull rod 4 toward the inflation hole 1-1 and push it back to the initial position. Then use a thin rod to sequentially extend into the third exhaust hole 2-4 and the second exhaust hole 4-5, push the first exhaust hole 3-7, push the push rod 3 back to the initial position, and the tungsten ball 5 rolls along the rolling slope 3-8 to the initial position. Finally, replace the new shear pin 7 and it can be reused. Figure 4 shown.

[0063] The inflatable unlocking device of the present invention is a purely mechanical structure design and does not need to be disassembled. Through the mutual cooperation of the push rod structure and the pull rod structure, the unlocking air pressure is used to adjust the shear strength of the shear pin to achieve the unlocking function and the reuse function, thereby improving the use efficiency.

[0064] 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. An air-filled unlocking device, comprising a cylinder body (1) having a cavity structure, wherein the head end of the cylinder body (1) is connected to an air-filling hole (1-1), and the tail end is connected to a cylinder sleeve (2) arranged coaxially with the cylinder body (1), and a cylinder sleeve hole (2-3) is provided on the end surface of the cylinder sleeve (2) away from the cylinder body (1); a push rod (3) is arranged in the axial direction in the cavity formed by the cylinder body (1) and the cylinder sleeve (2), and a pull rod (4) is provided on the outer periphery of the push rod (3) near the end of the cylinder sleeve (2), Features: The push rod (3) is provided with a push rod head (3-1), a first annular boss (3-2), a second annular boss (3-3), a first annular groove (3-4), a third annular boss (3-5) and a push rod tail (3-6) in sequence from the end away from the cylinder sleeve (2) to the end close to the cylinder sleeve (2); a sealing ring (6) tightly fitting with the inner cavity of the cylinder body (1) is provided on the outer periphery of the first annular boss (3-2); the diameter of the second annular boss (3-3) is smaller than the diameter of the first annular boss (3-2); a portion of the push rod tail (3-6) is located in the cavity formed by the cylinder body (1) and the cylinder sleeve (2), and a portion extends out of the cylinder sleeve hole (2-3); The pull rod (4) is sequentially provided with a first concave hole (4-1), a second concave hole (4-2) and a third concave hole (4-3) from the end close to the cylinder body (1) to the end far from the cylinder body (1), the first concave hole (4-1) matches the second annular boss (3-3), and the second concave hole (4-2) corresponds to a plurality of circular holes (4-4) distributed radially on the outer wall of the pull rod (4), a tungsten ball (5) is embedded in the circular hole (4-4), and the inner side of the tungsten ball (5) matches the third annular boss. (3-5) are in contact with each other, the outer side of the tungsten ball (5) is embedded in the connection between the cylinder body (1) and the cylinder sleeve (2), the third concave hole (4-3) matches the push rod tail (3-6), and a cavity (9) is provided between the bottom of the third concave hole (4-3) and the tail end surface of the push rod tail (3-6); the outer diameter of the outer wall of the pull rod (4) corresponding to the second concave hole (4-2) is larger than the inner diameter of the cylinder sleeve hole (2-3), and the outer wall of the pull rod (4) corresponding to the third concave hole (4-3) matches the cylinder sleeve hole (2-3); A shear pin (7) is radially penetrated at a position of the push rod tail (3-6) located outside the cylinder sleeve hole (2-3), the shear pin (7) extends to the outer wall of the pull rod (4), and the shear strength of the shear pin (7) is a set value; The push rod tail (3-6) is radially penetrated by a first exhaust hole (3-7), the first exhaust hole (3-7) is located inside the shear pin (7) and can be pushed to the outside of the cylinder sleeve hole (2-3) as the shear pin (7) is sheared; the third recessed hole (4-3) corresponds to the outer wall of the pull rod (4) and is radially penetrated by a second exhaust hole (4-5), and the second exhaust hole (4-5) corresponds to the position of the first exhaust hole (3-7).

2. The inflatable unlocking device according to claim 1, Features: A third exhaust hole (2-4) is radially penetrated on the cylinder wall of the cylinder sleeve (2), and the third exhaust hole (2-4) corresponds to the position of the second exhaust hole (4-5).

3. The inflatable unlocking device according to claim 2, Features: The first exhaust hole (3-7) is a circular hole, the second exhaust hole (4-5) is an elliptical hole, the third exhaust hole (2-4) is an elliptical hole, and the long radius of the third exhaust hole (2-4) is not less than the long radius of the second exhaust hole (4-5), and the long radius of the second exhaust hole (4-5) is not less than the diameter of the first exhaust hole (3-7).

4. The inflatable unlocking device according to claim 3, Features: The cylinder sleeve (2) is sequentially provided with a first step groove (2-1) and a second step groove (2-2) from the end close to the cylinder body (1) to the end far from the cylinder body (1); the cylinder sleeve (2) is connected to the cylinder body (1) via the first step groove (2-1); the transition position between the first step groove (2-1) and the second step groove (2-2) is in direct contact with the tungsten ball (5); the transition position between the first step groove (2-1) and the second step groove (2-2) is arranged as an inclined surface; and the second step groove (2-2) extends to the bottom end surface of the cylinder sleeve (2).

5. The inflatable unlocking device according to claim 4, Features: A buffer pad (8) is provided on the inner side of the cylinder sleeve (2) away from the bottom end surface of the cylinder body (1).

6. The inflatable unlocking device according to claim 5, Features: The first step groove (2-1) is connected to the outer periphery of the cylinder body (1) via threads.

7. The inflatable unlocking device according to claim 1, Features: The second annular boss (3-3) has a non-circular structure along the radial cross section, and is used to prevent the push rod (3) and the pull rod (4) from rotating relative to each other.

8. The inflatable unlocking device according to claim 7, Features: The cylinder sleeve hole (2-3) has a non-circular structure along the radial cross section, which is used to prevent the pull rod (4) and the cylinder sleeve (2) from rotating relative to each other.

9. The inflatable unlocking device according to claim 8, Features: A rolling inclined surface (3-8) is provided between the third annular boss (3-5) and the first annular groove (3-4) to facilitate the rolling of the tungsten ball (5).

10. The inflatable unlocking device according to claim 9, Features: The push rod head (3-1) contacts the axial top end of the inner cavity of the cylinder body (1) to ensure smooth air intake.

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