Recoverable rocket separation multistage pneumatic push rod

Abstract

The invention discloses a recoverable rocket separation multi-stage pneumatic push rod, and relates to the technical field of spaceflight, and the recoverable rocket separation multi-stage pneumatic push rod comprises a multi-stage pneumatic push rod arranged on a first separation body and a thrust bracket arranged on a second separation body; the multi-stage pneumatic push rod at least comprises a base, an outer barrel, a first lengthened barrel section and an inner barrel. One end of the base is communicated with the inflation system, and the other end of the base is connected with one end of the outer cylinder; an outer cylinder inner baffle ring is arranged on the inner side of the other end of the outer cylinder; a first outer baffle ring is arranged on the outer side of one end of the first lengthened shell ring, a main inner baffle ring is arranged on the inner side of one end of the first lengthened shell ring, and a first inner baffle ring is arranged on the inner side of the other end of the first lengthened shell ring; the first lengthened barrel section is arranged in the outer barrel; an inner cylinder outer baffle ring is arranged at one end of the inner cylinder, and an inner cylinder end is arranged at the other end of the inner cylinder; and the inner cylinder is arranged in the first lengthened cylinder section. The multi-stage push rod structure is adopted, the rocket structure layout is optimized, and safety and reuse of the recovery substage can be guaranteed.

Description

Technical Field

[0001] The present application relates to the field of aerospace technology, and in particular to a recoverable rocket separation multi-stage pneumatic push rod. Background Art

[0002] The pneumatic push rod is an important device in the separation of rocket stages. The device is located on both sides of the rocket separation surface. Before separation, compressed gas is filled into the pneumatic push rod. During separation, the rocket separation surface is unlocked and separated. Under the action of compressed gas, the pneumatic push rod is quickly pushed out, so that the sub-stages on both sides of the separation surface instantly gain a certain amount of kinetic energy, achieving the purpose of rapid separation.

[0003] After the pneumatic push rod is pushed out, there is air pressure inside the pneumatic push rod and the inflation system. The pneumatic push rod is installed on the sub-stage of the recoverable rocket, and excessive gas pressure poses a major hidden danger to the success of the recovery. The gas remaining inside the pneumatic push rod and the inflation system will also cause a certain amount of waste.

[0004] In addition, most of the existing pneumatic push rods are single-stage, and a large push rod stroke will lead to an oversized outer dimension of the pneumatic push rod, which is not conducive to the rocket structure layout. Moreover, the outer and inner tubes of the pneumatic push rod have oversized outer dimensions, which is not conducive to production and processing. Summary of the invention

[0005] The purpose of the present application is to provide a recoverable rocket separation multi-stage pneumatic push rod, which adopts a multi-stage push rod structure, optimizes the rocket structure layout, and can ensure the safety and reuse of the recovered sub-stage.

[0006] In order to achieve the above-mentioned purpose, the present application provides a recoverable rocket separation multi-stage pneumatic push rod, which at least includes: a multi-stage pneumatic push rod arranged on a first separation body and a thrust bracket arranged on a second separation body; wherein the multi-stage pneumatic push rod at least includes: a base, an outer tube, a first extended tube section and an inner tube; wherein one end of the base is connected to the inflation system, and the other end of the base is connected to one end of the outer tube; an outer tube inner retaining ring is arranged on the inner side of the other end of the outer tube; a first outer retaining ring is arranged on the outer side of one end of the first extended tube section, a main inner retaining ring is arranged on the inner side of one end of the first extended tube section, and a first inner retaining ring is arranged on the inner side of the other end of the first extended tube section Inner stop ring; the first extended cylinder section is arranged in the outer cylinder, and when it is contracted, the first outer stop ring contacts with one end of the outer cylinder, and the first inner stop ring is flush with the other end of the outer cylinder; after the air supply of the inflation system is pushed out, the first outer stop ring is limitedly connected with the inner stop ring of the outer cylinder, and the first inner stop ring is located outside the outer cylinder; an inner cylinder outer stop ring is arranged at one end of the inner cylinder, and an inner cylinder end head is arranged at the other end of the inner cylinder; the inner cylinder is arranged in the first extended cylinder section, and when it is contracted, the inner cylinder outer stop ring contacts with the main inner stop ring; after the air supply of the inflation system is pushed out, the inner cylinder outer stop ring is limitedly connected with the first inner stop ring, the inner cylinder end head is located outside the first extended cylinder section, and the inner cylinder end head contacts with the thrust bracket, thereby realizing separation.

[0007] As above, the multi-stage pneumatic push rod also includes: N second extended cylinder sections, one end of each second extended cylinder section is provided with a second outer stop ring, and the other end of each second extended cylinder section is provided with a second inner stop ring; the first second extended cylinder section is arranged in the first extended cylinder section, and when it is contracted, the second outer stop ring of the first second extended cylinder section contacts the main inner stop ring, and the second inner stop ring of the first second extended cylinder section is flush with the other end of the first extended cylinder section; after the air supply of the inflation system is pushed out, the second outer stop ring of the first second extended cylinder section is limitedly connected with the first inner stop ring, and the second inner stop ring of the first second extended cylinder section is located outside the first extended cylinder section; the second second extended cylinder section is arranged in the first second extended cylinder section, and when it is contracted, the second outer stop ring of the second second extended cylinder section contacts the main inner stop ring, and the second inner stop ring of the second second extended cylinder section is flush with the other end of the first second extended cylinder section; after the air supply of the inflation system is pushed out, the second outer stop ring of the second second extended cylinder section is connected with the first inner stop ring The second inner stop ring of the second extension cylinder segment is limitedly connected, and the second inner stop ring of the second second extension cylinder segment is located outside the first second extension cylinder segment; ...; the Nth second extension cylinder segment is arranged in the N-1th second extension cylinder segment, and when it is contracted, the second outer stop ring of the Nth second extension cylinder segment contacts the main inner stop ring, and the second inner stop ring of the Nth second extension cylinder segment is flush with the other end of the N-1th second extension cylinder segment; after the air supply of the inflation system is pushed out, the second outer stop ring of the Nth second extension cylinder segment The ring is limitedly connected with the second inner stop ring of the N-1th second extended cylinder segment, and the second inner stop ring of the N-1th second extended cylinder segment is located outside the N-1th second extended cylinder segment; the inner cylinder is arranged in the Nth second extended cylinder segment, and when it contracts, the outer stop ring of the inner cylinder contacts with the main inner stop ring; after the inflation system supplies air and pushes it out, the outer stop ring of the inner cylinder is limitedly connected with the second inner stop ring of the Nth second extended cylinder segment, the end of the inner cylinder is located outside the Nth second extended cylinder segment, and the end of the inner cylinder contacts with the thrust bracket, thereby achieving separation.

[0008] As above, wherein the number of the second extension cylinder section is one.

[0009] As above, a first dynamic sealing ring is arranged on the outer side of the first lengthened cylinder section, and the first dynamic sealing ring is located on the outer side of the first outer retaining ring.

[0010] As above, wherein a second dynamic sealing ring is arranged on the outer side of each second lengthened cylinder section, and the second dynamic sealing ring is located on the outer side of the second outer retaining ring.

[0011] As above, a third dynamic sealing ring is arranged on the outer side of the inner cylinder, and the third dynamic sealing ring is located on the outer side of the outer retaining ring of the inner cylinder.

[0012] As mentioned above, an exhaust pipe is also provided on the outer cylinder. When the inflation system supplies air to perform separation work, the exhaust pipe is closed; when the separation is completed, the exhaust pipe is opened.

[0013] As above, wherein the end of the inner cylinder is an adjustable spherical structure.

[0014] As mentioned above, a docking ring is arranged on the outer side of the base, and after the other end of the base is connected to one end of the outer tube, the one end of the outer tube is also in contact with the docking ring.

[0015] As above, a static sealing ring is arranged on the docking ring, and after the other end of the base is connected to one end of the outer tube, the one end of the outer tube is also in contact with the static sealing ring.

[0016] The beneficial effects achieved by this application are as follows:

[0017] (1) The multi-stage pneumatic push rod in the recoverable rocket separation multi-stage pneumatic push rod of the present application is a multi-stage push rod structure, which can reduce the external dimensions of the pneumatic push rod structure and is conducive to optimizing the rocket structure layout.

[0018] (2) The multi-stage pneumatic push rod in the recoverable rocket separation multi-stage pneumatic push rod of the present application can flexibly increase or decrease the number of second extended cylinder sections according to the stroke to meet the internal envelope requirements of the rocket.

[0019] (3) The multi-stage pneumatic push rod in the recoverable rocket separation multi-stage pneumatic push rod of the present application can reduce the outer dimensions of the outer tube and the inner tube of the pneumatic push rod structure, and reducing the outer dimensions of the outer tube and the inner tube into a multi-section form is conducive to production and processing.

[0020] (4) After the multi-stage pneumatic push rod of the recyclable rocket separation multi-stage pneumatic push rod of the present application works, the exhaust pipe on the multi-stage pneumatic push rod can quickly exhaust the gas inside the multi-stage pneumatic push rod and the inflation system, and the reaction force of the gas exhaust enables the sub-stages on both sides of the separation surface to obtain additional kinetic energy, thereby accelerating the separation speed of the two sub-stages of the rocket. At the same time, after the gas is exhausted, it is convenient to collect and reuse the recyclable rocket, ensuring the safety of the recovered sub-stages.

[0021] (5) The multi-stage pneumatic push rod of the recoverable rocket separation multi-stage pneumatic push rod of the present application is provided with an adjustable spherical structure, which can ensure the stability of the separation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a structural schematic diagram of an embodiment of a recoverable rocket separation multi-stage pneumatic push rod in a retracted state;

[0024] Figure 2 This is a schematic structural diagram of an embodiment of a recoverable rocket separation multi-stage pneumatic push rod in an extended state. DETAILED DESCRIPTION

[0025] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0026] like Figure 1-2 As shown, the present application provides a recyclable rocket separation multi-stage pneumatic push rod, which at least includes: a multi-stage pneumatic push rod 1 arranged on a first separation body and a thrust bracket 2 arranged on a second separation body. Among them, the multi-stage pneumatic push rod 1 at least includes: a base 11, an outer tube 12, a first lengthened tube section 13 and an inner tube 14. Among them, one end of the base 11 is connected to the inflation system 3, and the other end of the base 11 is connected to one end of the outer tube 12; the inner side of the other end of the outer tube 12 is provided with an outer tube inner retaining ring 121. A first outer stop ring 131 is provided on the outer side of one end of the first extended cylinder segment 13, a main inner stop ring 132 is provided on the inner side of one end of the first extended cylinder segment 13, and a first inner stop ring 133 is provided on the inner side of the other end of the first extended cylinder segment 13; the first extended cylinder segment 13 is provided in the outer cylinder 12, and when contracted, the first outer stop ring 131 contacts with one end of the outer cylinder 12, and the first inner stop ring 133 is flush with the other end of the outer cylinder 12; after the inflation system 3 supplies air and is pushed out, the first outer stop ring 131 is limitedly connected with the inner stop ring 121 of the outer cylinder, and the first inner stop ring 133 is located outside the outer cylinder 12. An inner tube outer retaining ring 141 is provided at one end of the inner tube 14, and an inner tube end head 142 is provided at the other end of the inner tube 14; the inner tube 14 is arranged in the first extended cylinder section 13, and when contracted, the inner tube outer retaining ring 141 contacts with the main inner retaining ring 132; after the inflation system 3 supplies air and pushes it out, the inner tube outer retaining ring 141 is limitedly connected with the first inner retaining ring 133, and the inner tube end head 142 is located outside the first extended cylinder section 13, and the inner tube end head 142 contacts with the thrust bracket 3, thereby achieving separation.

[0027] Specifically, the size (e.g., diameter) of the outer tube 12 is larger than the size (e.g., diameter) of the first elongated tube section 13, and the size (e.g., diameter) of the first elongated tube section 13 is larger than the size (e.g., diameter) of the inner tube 14. The outer tube 12 is sleeved on the outside of the first elongated tube section 13, and the first elongated tube section 13 is sleeved on the outside of the inner tube 14, thereby forming a multi-stage push rod structure, which can reduce the external dimensions of the pneumatic push rod structure and is conducive to optimizing the rocket structure layout. In addition, the reduction in the external dimensions of the outer tube and the inner tube of the pneumatic push rod structure is also conducive to production and processing.

[0028] Furthermore, the first separation body is rocket sub-stage 2, and the second separation body is rocket sub-stage 1, but it is not limited to the first separation body being rocket sub-stage 2 and the second separation body being rocket sub-stage 1, and it can also be a separation body at other positions of the rocket that need to be separated, such as fairing separation.

[0029] Furthermore, the inflation system 3 is used to provide compressed gas to the multi-stage pneumatic push rod 1 and increase the inflation volume. The gas provided by the inflation system 3 is: working gas such as nitrogen, helium or compressed air.

[0030] Furthermore, the base 11 is an integrated structure or a separate structure, and the present application prefers an integrated structure.

[0031] Furthermore, the outer cylinder 12 is an integrated structure or a separate structure, and the present application prefers an integrated structure.

[0032] Furthermore, the first extension cylinder section 13 is an integrated structure or a separate structure, and the integrated structure is preferred in the present application.

[0033] Furthermore, the inner cylinder 14 is an integrated structure or a separate structure, and the present application prefers an integrated structure.

[0034] Furthermore, the multi-stage pneumatic push rod 1 also includes: N second lengthened barrel segments 15, each of which is provided with a second outer retaining ring 151 at one end, and a second inner retaining ring 152 at the other end. The first second lengthened barrel segment 15 is provided in the first lengthened barrel segment 13, and when contracted, the second outer retaining ring 151 of the first second lengthened barrel segment 15 contacts the main inner retaining ring 132, and the second inner retaining ring 152 of the first second lengthened barrel segment 15 is flush with the other end of the first lengthened barrel segment 13; after the inflation system 3 supplies air and pushes out, the second outer retaining ring 151 of the first second lengthened barrel segment 15 is limitedly connected with the first inner retaining ring 133, and the second inner retaining ring 152 of the first second lengthened barrel segment 15 is located outside the first lengthened barrel segment 13. The second second extension cylinder segment 15 is arranged in the first second extension cylinder segment 15. When it is retracted, the second outer baffle ring 151 of the second second extension cylinder segment 15 contacts the main inner baffle ring 132, and the second inner baffle ring 152 of the second second extension cylinder segment 15 is flush with the other end of the first second extension cylinder segment 15; after the inflation system 3 supplies air and pushes it out, the second outer baffle ring 151 of the second second extension cylinder segment 15 is limitedly connected with the second inner baffle ring 152 of the first second extension cylinder segment 15, and the second inner baffle ring 152 of the second second extension cylinder segment 15 is located outside the first second extension cylinder segment 15; ...; the Nth second extension cylinder segment 15 is arranged in the N-1th second extension cylinder segment 15. When it is retracted, the second outer baffle ring 151 of the Nth second extension cylinder segment 15 contacts the main inner baffle ring 132, and the Nth second The second inner stop ring 151 of the extended cylinder segment 15 is flush with the other end of the N-1th second extended cylinder segment 15; after the inflation system 3 supplies air and pushes it out, the second outer stop ring 151 of the N-1th second extended cylinder segment 15 is limitedly connected with the second inner stop ring 152 of the N-1th second extended cylinder segment 15, and the second inner stop ring 151 of the N-1th second extended cylinder segment 15 is located outside the N-1th second extended cylinder segment 15; the inner cylinder 14 is arranged in the N-1th second extended cylinder segment 15, and when it shrinks, the inner cylinder outer stop ring 141 contacts with the main inner stop ring 132; after the inflation system 3 supplies air and pushes it out, the inner cylinder outer stop ring 141 is limitedly connected with the second inner stop ring 152 of the N-1th second extended cylinder segment 15, and the inner cylinder end head 142 is located outside the N-1th second extended cylinder segment 15, and the inner cylinder end head 142 contacts with the thrust bracket 2, thereby achieving separation.

[0035] Specifically, the size (eg, diameter) of the Nth second lengthened barrel section 15 is smaller than the size (eg, diameter) of the N-1th second lengthened barrel section 15, and the N-1th second lengthened barrel section 15 is sleeved outside the Nth second lengthened barrel section 15. N is a natural number.

[0036] Further, the specific number of the second extension barrel section 15 is set according to the actual situation, for example, the number of the second extension barrel section 15 can be increased or decreased according to the push rod stroke. The present application is preferably: one. When there is one second extension barrel section 15, the second extension barrel section 15 is arranged in the first extension barrel section 13, and the inner barrel 14 is arranged in the second extension barrel section 15.

[0037] Furthermore, a first dynamic sealing ring 134 is disposed on the outer side of the first lengthened cylinder segment 13 , and the first dynamic sealing ring 134 contacts the inner side of the outer cylinder 12 .

[0038] Specifically, when the first elongated cylinder section 13 moves in the outer cylinder 12 , the first dynamic sealing ring 134 ensures the sealing effect between the first elongated cylinder section 13 and the outer cylinder 12 .

[0039] Furthermore, the specific location of the first dynamic sealing ring 134 is determined according to actual conditions. In the present application, it is preferred that the first dynamic sealing ring 134 is located outside the first outer retaining ring 131 .

[0040] Furthermore, a second dynamic sealing ring 153 is disposed on the outer side of each second lengthened cylinder section 15 .

[0041] Specifically, the second dynamic sealing ring 153 ensures the sealing performance of the second extension cylinder section 15 when it moves.

[0042] Furthermore, the specific location of the second dynamic sealing ring 153 is determined according to actual conditions. In the present application, it is preferred that the second dynamic sealing ring 153 is located outside the second outer retaining ring 151 .

[0043] Furthermore, a third dynamic sealing ring 143 is disposed on the outer side of the inner cylinder 14 .

[0044] Specifically, the third dynamic sealing ring 143 ensures the sealing performance of the inner tube 14 when it moves.

[0045] Furthermore, the specific location of the third dynamic sealing ring 143 is determined according to actual conditions. In the present application, it is preferred that the third dynamic sealing ring 143 is located outside the inner tube outer retaining ring 141 .

[0046] Furthermore, an exhaust pipe 122 is also provided on the outer tube 12. When the inflation system supplies air to perform separation work, the exhaust pipe 122 is closed; when the separation is completed, the exhaust pipe 122 is opened.

[0047] Specifically, the exhaust pipe 122 is provided to ensure that after the multi-stage pneumatic push rods of the recoverable rocket complete the separation work, the gas in the multi-stage pneumatic push rods 1 and the inflation system 3 is quickly discharged, and the reaction force of the discharged gas on the air is used to do secondary work, thereby achieving the effect of increasing the kinetic energy of the two sub-stages of the rocket. In addition, the sub-stage that exhausts the gas is more convenient for the collection and reuse of the recoverable rocket, which can ensure the safety of the recovered sub-stage.

[0048] Furthermore, the inner tube end 142 is an adjustable spherical structure, but is not limited to an adjustable spherical structure. The present application preferably uses an adjustable spherical structure to ensure the stability of the separation system.

[0049] Specifically, the adjustable spherical structure enables the two sub-stages of the rocket on both sides of the separation surface to be in close contact with the multi-stage pneumatic push rod 1 before separation. The spherical structure can prevent the different postures of the two sub-stages during the separation process from affecting the stroke of the multi-stage pneumatic push rod 1.

[0050] Furthermore, the other end of the base 11 is threadedly connected to one end of the outer tube 12, but is not limited to threaded connection. The present application preferably uses threaded connection for ease of installation, disassembly or replacement.

[0051] Furthermore, a docking ring 111 is provided on the outer side of the base 11 , and after the other end of the base 11 is connected to one end of the outer tube 12 , the one end of the outer tube 12 is also in contact with the docking ring 111 .

[0052] Specifically, the docking ring 111 can limit the connection position between the outer tube 12 and the base 11 .

[0053] Furthermore, a static sealing ring 112 is provided on the docking ring 111 , and after the other end of the base 11 is connected to one end of the outer tube 12 , the one end of the outer tube 12 is also in contact with the static sealing ring 112 .

[0054] Specifically, the static sealing ring 112 can ensure the sealing of the connection position between the outer tube 12 and the base 11 .

[0055] The beneficial effects achieved by this application are as follows:

[0056] (1) The multi-stage pneumatic push rod in the recoverable rocket separation multi-stage pneumatic push rod of the present application is a multi-stage push rod structure, which can be adapted to different push rod strokes, can reduce the external dimensions of the pneumatic push rod structure, and is conducive to optimizing the rocket structure layout.

[0057] (2) The multi-stage pneumatic push rod in the recoverable rocket separation multi-stage pneumatic push rod of the present application can flexibly increase or decrease the number of second extended cylinder sections according to the stroke to meet the internal envelope requirements of the rocket.

[0058] (3) The multi-stage pneumatic push rod in the recoverable rocket separation multi-stage pneumatic push rod of the present application can reduce the outer dimensions of the outer tube and the inner tube of the pneumatic push rod structure, and reducing the outer dimensions of the outer tube and the inner tube into a multi-section form is conducive to production and processing.

[0059] (4) After the multi-stage pneumatic push rod of the recyclable rocket separation multi-stage pneumatic push rod of the present application works, the exhaust pipe on the multi-stage pneumatic push rod can quickly exhaust the gas inside the multi-stage pneumatic push rod and the inflation system, and the reaction force of the gas exhaust enables the sub-stages on both sides of the separation surface to obtain additional kinetic energy, thereby accelerating the separation speed of the two sub-stages of the rocket. At the same time, after the gas is exhausted, it is convenient to collect and reuse the recyclable rocket, ensuring the safety of the recovered sub-stages.

[0060] (5) The multi-stage pneumatic push rod of the recoverable rocket separation multi-stage pneumatic push rod of the present application is provided with an adjustable spherical structure, which can ensure the stability of the separation system.

[0061] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the scope of protection of the present application is intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application. Obviously, those skilled in the art may make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the protection scope of the present application and its equivalent technology, the present application is also intended to include these modifications and variations.

Claims

1. A recyclable rocket separation multi-stage pneumatic push rod, characterized in that: At least: A multi-stage pneumatic push rod disposed on the first separation body and a thrust support disposed on the second separation body; Wherein, the multi-stage pneumatic push rod comprises at least: a base, an outer cylinder, a first lengthened cylinder section and an inner cylinder; One end of the base is connected to the inflation system, and the other end of the base is connected to one end of the outer tube; an outer tube inner retaining ring is arranged on the inner side of the other end of the outer tube; A first outer stop ring is arranged on the outer side of one end of the first extension cylinder section, a main inner stop ring is arranged on the inner side of one end of the first extension cylinder section, and a first inner stop ring is arranged on the inner side of the other end of the first extension cylinder section; the first extension cylinder section is arranged in the outer cylinder, and when it is contracted, the first outer stop ring contacts with one end of the outer cylinder, and the first inner stop ring is flush with the other end of the outer cylinder; after the air supply of the inflation system is pushed out, the first outer stop ring is limitedly connected with the inner stop ring of the outer cylinder, and the first inner stop ring is located outside the outer cylinder; An inner tube outer retaining ring is provided at one end of the inner tube, and an inner tube end head is provided at the other end of the inner tube; the inner tube is arranged in the first extended cylinder section, and when contracted, the inner tube outer retaining ring contacts the main inner retaining ring; after the inflation system supplies air and pushes it out, the inner tube outer retaining ring is limitedly connected with the first inner retaining ring, the inner tube end head is located outside the first extended cylinder section, and the inner tube end head contacts the thrust bracket, thereby achieving separation.

2. The recyclable rocket separation multi-stage pneumatic push rod according to claim 1 is characterized in that: The multi-stage pneumatic push rod further includes: N second lengthened cylinder sections, one end of each second lengthened cylinder section is provided with a second outer retaining ring, and the other end of each second lengthened cylinder section is provided with a second inner retaining ring; The first second extended cylinder section is arranged in the first extended cylinder section, and when it is contracted, the second outer stop ring of the first second extended cylinder section contacts the main inner stop ring, and the second inner stop ring of the first second extended cylinder section is flush with the other end of the first extended cylinder section; after the air supply of the inflation system is pushed out, the second outer stop ring of the first second extended cylinder section is limitedly connected with the first inner stop ring, and the second inner stop ring of the first second extended cylinder section is located outside the first extended cylinder section; the second second extended cylinder section is arranged in the first second extended cylinder section, and when it is contracted, the second outer stop ring of the second second extended cylinder section contacts the main inner stop ring, and the second inner stop ring of the second second extended cylinder section is flush with the other end of the first second extended cylinder section; after the air supply of the inflation system is pushed out, the second outer stop ring of the second second extended cylinder section is limitedly connected with the second inner stop ring of the first second extended cylinder section, and the second inner stop ring of the second second extended cylinder section is located Outside the first second extended cylinder section; ...; The Nth second extended cylinder section is arranged in the N-1th second extended cylinder section, and when it is retracted, the second outer stop ring of the Nth second extended cylinder section contacts the main inner stop ring, and the second inner stop ring of the Nth second extended cylinder section is flush with the other end of the N-1th second extended cylinder section; after the air supply of the inflation system is pushed out, the second outer stop ring of the Nth second extended cylinder section is limitedly connected with the second inner stop ring of the N-1th second extended cylinder section, and the second inner stop ring of the Nth second extended cylinder section is located outside the N-1th second extended cylinder section; the inner cylinder is arranged in the Nth second extended cylinder section, and when it is retracted, the outer stop ring of the inner cylinder contacts the main inner stop ring; after the air supply of the inflation system is pushed out, the outer stop ring of the inner cylinder is limitedly connected with the second inner stop ring of the Nth second extended cylinder section, the end of the inner cylinder is located outside the Nth second extended cylinder section, and the end of the inner cylinder contacts the thrust bracket, thereby realizing separation.

3. The recoverable rocket separation multi-stage pneumatic push rod according to claim 2 is characterized in that: The second extension tube section is one.

4. The recoverable rocket separation multi-stage pneumatic push rod according to claim 2, characterized in that: A first dynamic sealing ring is arranged on the outer side of the first lengthened cylinder section, and the first dynamic sealing ring is located on the outer side of the first outer retaining ring.

5. The recoverable rocket separation multi-stage pneumatic push rod according to claim 2, characterized in that: A second dynamic sealing ring is arranged on the outer side of each second lengthened cylinder section, and the second dynamic sealing ring is located on the outer side of the second outer retaining ring.

6. The recoverable rocket separation multi-stage pneumatic push rod according to claim 2, characterized in that: A third dynamic sealing ring is arranged on the outer side of the inner cylinder, and the third dynamic sealing ring is located on the outer side of the outer retaining ring of the inner cylinder.

7. The recoverable rocket separation multi-stage pneumatic push rod according to claim 1, characterized in that: An exhaust pipe is also provided on the outer cylinder. When the inflation system supplies air to perform separation work, the exhaust pipe is closed; when the separation is completed, the exhaust pipe is opened.

8. The recoverable rocket separation multi-stage pneumatic push rod according to claim 1, characterized in that: The end of the inner cylinder is an adjustable spherical structure.

9. The recoverable rocket separation multi-stage pneumatic push rod according to claim 1, characterized in that: A docking ring is arranged on the outer side of the base, and after the other end of the base is connected with one end of the outer tube, the one end of the outer tube is also in contact with the docking ring.

10. The recoverable rocket separation multi-stage pneumatic push rod according to claim 9, characterized in that: A static sealing ring is arranged on the butt joint ring, and after the other end of the base is connected with one end of the outer tube, the one end of the outer tube is also in contact with the static sealing ring.

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