Recyclable rocket separation multi-stage pneumatic push rod

Abstract

The application discloses a recyclable rocket separation multistage aerodynamic push rod and relates to the technical field of spaceflight. The recyclable rocket separation multistage aerodynamic push rod comprises a multistage aerodynamic push rod arranged on a first separation body and a thrust support arranged on a second separation body. The multistage aerodynamic push rod comprises a base, an outer cylinder, a first lengthened cylinder section and an inner cylinder. One end of the base is communicated with an inflation system, and the other end of the base is connected with one end of the outer cylinder. The inner side of the other end of the outer cylinder is provided with an outer cylinder inner blocking ring. The outer side of one end of the first lengthened cylinder section is provided with a first outer blocking ring, the inner side of one end of the first lengthened cylinder section is provided with a main inner blocking ring, and the inner side of the other end of the first lengthened cylinder section is provided with a first inner blocking ring. The first lengthened cylinder section is arranged in the outer cylinder. One end of the inner cylinder is provided with an inner cylinder outer blocking ring, and the other end of the inner cylinder is provided with an inner cylinder end. The inner cylinder is arranged in the first lengthened cylinder section. The recyclable rocket separation multistage aerodynamic push rod adopts a multistage push rod structure, optimizes the rocket structure layout and can guarantee the safety and reuse of a recycled sublevel.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of aerospace technology, and particularly relates to a multi-stage pneumatic push rod for separating a recoverable rocket. BACKGROUND

[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. When the rocket separation surface is unlocked and separated, the pneumatic push rod is quickly pushed out under the action of the compressed gas, so that the sub-stages on both sides of the separation surface instantaneously obtain a certain kinetic energy, achieving the purpose of rapid separation.

[0003] After the pneumatic push rod is pushed out, there is gas pressure inside the pneumatic push rod and the gas filling system. Since the pneumatic push rod is installed on the sub-stage of the recoverable rocket, excessive gas pressure poses a significant risk to the success of recovery. The gas remaining in the pneumatic push rod and the gas filling system also causes a certain amount of waste.

[0004] In addition, the existing pneumatic push rod is mostly single-stage, and a large push rod stroke will result in an excessively large size of the pneumatic push rod, which is not conducive to the structural layout of the rocket. Moreover, an excessively large size of the outer cylinder and the inner cylinder of the pneumatic push rod is also not conducive to production and processing. SUMMARY

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

[0006] To achieve the above-mentioned purpose, the present application provides a multi-stage pneumatic push rod for separating a recoverable rocket, which at least comprises a multi-stage pneumatic push rod arranged on a first separation body and a thrust support arranged on a second separation body. The multi-stage pneumatic push rod at least comprises a base, an outer cylinder, a first elongated cylinder section, and an inner cylinder. One end of the base is in communication with a gas filling system, and the other end of the base is connected to one end of the outer cylinder. The inner side of the other end of the outer cylinder is provided with an outer cylinder inner stop ring. The outer side of one end of the first elongated cylinder section is provided with a first outer stop ring, the inner side of one end of the first elongated cylinder section is provided with a main inner stop ring, and the inner side of the other end of the first elongated cylinder section is provided with a first inner stop ring. The first elongated cylinder section is arranged in the outer cylinder. When retracted, the first outer stop ring is in contact 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 gas filling system is supplied with gas and pushed out, the first outer stop ring is in limiting connection with the outer cylinder inner stop ring, and the first inner stop ring is located outside the outer cylinder. One end of the inner cylinder is provided with an inner cylinder outer stop ring, and the other end of the inner cylinder is provided with an inner cylinder end. The inner cylinder is arranged in the first elongated cylinder section. When retracted, the inner cylinder outer stop ring is in contact with the main inner stop ring. After the gas filling system is supplied with gas and pushed out, the inner cylinder outer stop ring is in limiting connection with the first inner stop ring, the inner cylinder end is located outside the first elongated cylinder section, and the inner cylinder end is in contact with the thrust support, thereby achieving separation.

[0007] The multi-stage pneumatic push rod further comprises N second lengthening barrel sections, one end of each of the second lengthening barrel sections is provided with a second outer stop ring, and the other end of each of the second lengthening barrel sections is provided with a second inner stop ring; the first second lengthening barrel section is arranged in the first lengthening barrel section, when being retracted, the second outer stop ring of the first second lengthening barrel section is in contact with the main inner stop ring, and the second inner stop ring of the first second lengthening barrel section is flush with the other end of the first lengthening barrel section; after the gas supply system is pushed out by gas supply, the second outer stop ring of the first second lengthening barrel section is in position-limiting connection with the first inner stop ring, and the second inner stop ring of the first second lengthening barrel section is located outside the first lengthening barrel section; the second second lengthening barrel section is arranged in the first second lengthening barrel section, when being retracted, the second outer stop ring of the second second lengthening barrel section is in contact with the main inner stop ring, and the second inner stop ring of the second second lengthening barrel section is flush with the other end of the first second lengthening barrel section; after the gas supply system is pushed out by gas supply, the second outer stop ring of the second second lengthening barrel section is in position-limiting connection with the second inner stop ring of the first second lengthening barrel section, and the second inner stop ring of the second second lengthening barrel section is located outside the first second lengthening barrel section; the Nth second lengthening barrel section is arranged in the (N-1) th second lengthening barrel section, when being retracted, the second outer stop ring of the Nth second lengthening barrel section is in contact with the main inner stop ring, and the second inner stop ring of the Nth second lengthening barrel section is flush with the other end of the (N-1) th second lengthening barrel section; after the gas supply system is pushed out by gas supply, the second outer stop ring of the Nth second lengthening barrel section is in position-limiting connection with the second inner stop ring of the (N-1) th second lengthening barrel section, and the second inner stop ring of the Nth second lengthening barrel section is located outside the (N-1) th second lengthening barrel section; the inner barrel is arranged in the Nth second lengthening barrel section, when being retracted, the outer stop ring of the inner barrel is in contact with the main inner stop ring; after the gas supply system is pushed out by gas supply, the outer stop ring of the inner barrel is in position-limiting connection with the second inner stop ring of the Nth second lengthening barrel section, the end head of the inner barrel is located outside the Nth second lengthening barrel section, and the end head of the inner barrel is in contact with the thrust support, so that separation is realized.

[0008] The second lengthening barrel section is one.

[0009] The first lengthening barrel section is provided with a first dynamic sealing ring on the outer side, and the first dynamic sealing ring is located on the outer side of the first outer stop ring.

[0010] The second lengthening barrel section is one.

[0011] The inner barrel is provided with a third dynamic sealing ring on the outer side, and the third dynamic sealing ring is located on the outer side of the outer stop ring of the inner barrel.

[0012] The outer barrel is further provided with an exhaust pipe, the exhaust pipe is closed when the gas supply system performs separation work, and the exhaust pipe is opened after separation is completed.

[0013] The inner cylinder end head is an adjustable spherical structure.

[0014] The outer side of the base is provided with a butt joint ring, and after the other end of the base is connected with one end of the outer cylinder, the one end of the outer cylinder also contacts the butt joint ring.

[0015] The butt joint ring is provided with a static sealing ring, and after the other end of the base is connected with one end of the outer cylinder, the one end of the outer cylinder also contacts the static sealing ring.

[0016] The beneficial effects realized by the present application are as follows:

[0017] (1) The multi-stage pneumatic push rod in the recyclable rocket separation multi-stage pneumatic push rod is a multi-stage push rod structure, which can reduce the size of the pneumatic push rod structure, and is beneficial to optimizing the rocket structure layout.

[0018] (2) The multi-stage pneumatic push rod in the recyclable rocket separation multi-stage pneumatic push rod can flexibly increase or decrease the number of second lengthening cylinder sections according to the stroke, meeting the internal envelope requirements of the rocket.

[0019] (3) The multi-stage pneumatic push rod in the recyclable rocket separation multi-stage pneumatic push rod can reduce the size of the outer cylinder and the inner cylinder of the pneumatic push rod structure, and reducing the size of the outer cylinder and the inner cylinder into a multi-section form is beneficial to production and processing.

[0020] (4) After the multi-stage pneumatic push rod of the recyclable rocket separation multi-stage pneumatic push rod 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. The reaction force of the gas exhaust makes the sub-stages on both sides of the separation surface 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 for the collection and reuse of the recyclable rocket, and the safety of the recycled sub-stage is ensured.

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

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0023] Fig. 1 Structure diagram of one embodiment of the recyclable rocket separation multi-stage pneumatic push rod in a contracted state;

[0024] Fig. 2 Figure 1 is a structural schematic diagram of an embodiment of a multi-stage aerodynamic push rod of a recoverable rocket in an extended state. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be apparently and completely described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0026] As shown in Figs. 1-2 the present application provides a multi-stage aerodynamic push rod of a recoverable rocket, which at least comprises a multi-stage aerodynamic push rod 1 arranged on a first separation body and a thrust support 2 arranged on a second separation body. The multi-stage aerodynamic push rod 1 at least comprises a base 11, an outer cylinder 12, a first lengthened cylinder section 13 and an inner cylinder 14. One end of the base 11 is in communication with a gas charging system 3, and the other end of the base 11 is connected with one end of the outer cylinder 12. The inner side of the other end of the outer cylinder 12 is provided with an outer cylinder inner stop ring 121. The outer side of one end of the first lengthened cylinder section 13 is provided with a first outer stop ring 131, the inner side of one end of the first lengthened cylinder section 13 is provided with a main inner stop ring 132, and the inner side of the other end of the first lengthened cylinder section 13 is provided with a first inner stop ring 133. The first lengthened cylinder section 13 is arranged in the outer cylinder 12. When retracted, the first outer stop ring 131 is in contact 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 gas charging system 3 is supplied with gas and pushed out, the first outer stop ring 131 is limitingly connected with the outer cylinder inner stop ring 121, and the first inner stop ring 133 is located outside the outer cylinder 12. One end of the inner cylinder 14 is provided with an inner cylinder outer stop ring 141, and the other end of the inner cylinder 14 is provided with an inner cylinder end 142. The inner cylinder 14 is arranged in the first lengthened cylinder section 13. When retracted, the inner cylinder outer stop ring 141 is in contact with the main inner stop ring 132. After the gas charging system 3 is supplied with gas and pushed out, the inner cylinder outer stop ring 141 is limitingly connected with the first inner stop ring 133, the inner cylinder end 142 is located outside the first lengthened cylinder section 13, and the inner cylinder end 142 is in contact with the thrust support 3, thereby achieving separation.

[0027] Specifically, the size (for example: diameter) of the outer cylinder 12 is greater than the size (for example: diameter) of the first lengthened cylinder section 13, and the size (for example: diameter) of the first lengthened cylinder section 13 is greater than the size (for example: diameter) of the inner cylinder 14. The outer cylinder 12 is sleeved on the first lengthened cylinder section 13, and the first lengthened cylinder section 13 is sleeved on the inner cylinder 14, thereby forming a multi-stage push rod structure, which can reduce the size of the aerodynamic push rod structure and is conducive to optimizing the structure layout of the rocket. In addition, the reduction of the size of the outer cylinder and the inner cylinder of the aerodynamic push rod structure is also conducive to production and processing.

[0028] Further, the first separation body is the rocket substage 2, and the second separation body is the rocket substage 1, but not limited to the first separation body being the rocket substage 2 and the second separation body being the rocket substage 1, but also can be the separation body of other positions needing separation of the rocket such as the fairing separation.

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

[0030] Further, the base 11 is a one-piece structure or a separated structure, and the application preferably is a one-piece structure.

[0031] Further, the outer cylinder 12 is a one-piece structure or a separated structure, and the application preferably is a one-piece structure.

[0032] Further, the first lengthened cylinder section 13 is a one-piece structure or a separated structure, and the application preferably is a one-piece structure.

[0033] Further, the inner cylinder 14 is a one-piece structure or a separated structure, and the application preferably is a one-piece structure.

[0034] Further, the multi-stage pneumatic push rod 1 further comprises: N second lengthening barrel sections 15, each of which is provided with a second outer stop ring 151 at one end and a second inner stop ring 152 at the other end. The first second lengthening barrel section 15 is arranged in the first lengthening barrel section 13. When retracted, the second outer stop ring 151 of the first second lengthening barrel section 15 is in contact with the main inner stop ring 132, and the second inner stop ring 152 of the first second lengthening barrel section 15 is flush with the other end of the first lengthening barrel section 13. After being pushed out by the gas supply system 3, the second outer stop ring 151 of the first second lengthening barrel section 15 is in position-limiting connection with the first inner stop ring 133, and the second inner stop ring 152 of the first second lengthening barrel section 15 is located outside the first lengthening barrel section 13. The second second lengthening barrel section 15 is arranged in the first second lengthening barrel section 15. When retracted, the second outer stop ring 151 of the second second lengthening barrel section 15 is in contact with the main inner stop ring 132, and the second inner stop ring 152 of the second second lengthening barrel section 15 is flush with the other end of the first second lengthening barrel section 15. After being pushed out by the gas supply system 3, the second outer stop ring 151 of the second second lengthening barrel section 15 is in position-limiting connection with the second inner stop ring 152 of the first second lengthening barrel section 15, and the second inner stop ring 152 of the second second lengthening barrel section 15 is located outside the first second lengthening barrel section 15. The Nth second lengthening barrel section 15 is arranged in the (N-1)th second lengthening barrel section 15. When retracted, the second outer stop ring 151 of the Nth second lengthening barrel section 15 is in contact with the main inner stop ring 132, and the second inner stop ring 151 of the Nth second lengthening barrel section 15 is flush with the other end of the (N-1)th second lengthening barrel section 15. After being pushed out by the gas supply system 3, the second outer stop ring 151 of the Nth second lengthening barrel section 15 is in position-limiting connection with the second inner stop ring 152 of the (N-1)th second lengthening barrel section 15, and the second inner stop ring 151 of the Nth second lengthening barrel section 15 is located outside the (N-1)th second lengthening barrel section 15. The inner barrel 14 is arranged in the Nth second lengthening barrel section 15. When retracted, the inner barrel outer stop ring 141 is in contact with the main inner stop ring 132. After being pushed out by the gas supply system 3, the inner barrel outer stop ring 141 is in position-limiting connection with the second inner stop ring 152 of the Nth second lengthening barrel section 15, the inner barrel end 142 is located outside the Nth second lengthening barrel section 15, and the inner barrel end 142 is in contact with the thrust support 2, thereby achieving separation.

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

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

[0037] Further, the outer side of the first lengthening cylinder section 13 is provided with a first dynamic sealing ring 134, and the first dynamic sealing ring 134 is in contact with the inner side of the outer cylinder 12.

[0038] Specifically, when the first lengthening cylinder section 13 moves in the outer cylinder 12, the sealing effect between the first lengthening cylinder section 13 and the outer cylinder 12 is ensured by the first dynamic sealing ring 134.

[0039] Further, the specific arrangement position of the first dynamic sealing ring 134 is determined according to actual conditions, and the application preferably is that the first dynamic sealing ring 134 is arranged on the outer side of the first outer blocking ring 131.

[0040] Further, the outer side of each second lengthening cylinder section 15 is provided with a second dynamic sealing ring 153.

[0041] Specifically, the sealing property of the second lengthening cylinder section 15 during movement is ensured by the second dynamic sealing ring 153.

[0042] Further, the specific arrangement position of the second dynamic sealing ring 153 is determined according to actual conditions, and the application preferably is that the second dynamic sealing ring 153 is arranged on the outer side of the second outer blocking ring 151.

[0043] Further, the outer side of the inner cylinder 14 is provided with a third dynamic sealing ring 143.

[0044] Specifically, the sealing property of the inner cylinder 14 during movement is ensured by the third dynamic sealing ring 143.

[0045] Further, the specific arrangement position of the third dynamic sealing ring 143 is determined according to actual conditions, and the application preferably is that the third dynamic sealing ring 143 is arranged on the outer side of the inner cylinder outer blocking ring 141.

[0046] Further, the outer cylinder 12 is further provided with an exhaust pipe 122, which is closed when the air supply system performs separation work, and is opened after the separation is completed.

[0047] Specifically, the exhaust pipe 122 can ensure that the recyclable rocket separates the multi-stage pneumatic push rod to complete the separation work, quickly discharges the gas in the multi-stage pneumatic push rod 1 and the inflation system 3, uses the reaction force of the discharged gas on the air to do work again, increases the kinetic energy of the two sub-stages of the rocket, and the sub-stage of the exhaust gas is more convenient for the collection and reuse of the recyclable rocket, and can ensure the safety of the recycled sub-stage.

[0048] Further, the inner cylinder end 142 is an adjustable spherical structure, but is not limited to an adjustable spherical structure, and the application preferably is an adjustable spherical structure, which can ensure the stability of the separation system.

[0049] Specifically, the adjustable spherical structure can allow 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, and the spherical structure can avoid the influence of the different attitudes of the two sub-stages on the stroke of the multi-stage pneumatic push rod 1 during separation.

[0050] Further, the other end of the base 11 is threadedly connected to one end of the outer cylinder 12, but is not limited to threadedly connected, and the application preferably is threadedly connected, which is convenient for installation, disassembly or replacement.

[0051] Further, the outer side of the base 11 is provided with a butt joint ring 111, and after the other end of the base 11 is connected to one end of the outer cylinder 12, the one end of the outer cylinder 12 also contacts the butt joint ring 111.

[0052] Specifically, the butt joint ring 111 can limit the connection position of the outer cylinder 12 and the base 11.

[0053] Further, the butt joint ring 111 is provided with a static seal ring 112, and after the other end of the base 11 is connected to one end of the outer cylinder 12, the one end of the outer cylinder 12 also contacts the static seal ring 112.

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

[0055] The application achieves the following beneficial effects:

[0056] (1) The multi-stage pneumatic push rod in the recyclable rocket separation multi-stage pneumatic push rod of the application is a multi-stage push rod structure, which can be applied to different push rod strokes, can reduce the size 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 recyclable rocket separation multi-stage pneumatic push rod of the application can flexibly increase or decrease the number of second lengthening 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 recyclable rocket separation multi-stage pneumatic push rod can reduce the outer diameter of the outer cylinder and the inner cylinder of the pneumatic push rod structure, and the reduction of the outer diameter of the outer cylinder and the inner cylinder 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 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. The reaction force of the gas exhaust makes the sub-levels on both sides of the separation surface obtain additional kinetic energy, thereby accelerating the separation speed of the two sub-levels of the rocket. At the same time, after the gas is exhausted, it is convenient for the collection and reuse of the recyclable rocket, and the safety of the recycled sub-levels is ensured.

[0060] (5) The multi-stage pneumatic push rod of the recyclable rocket separation multi-stage pneumatic push rod 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 can make further changes and modifications to the embodiments once they know the basic inventive concept. Therefore, the scope of protection of the present application is intended to include the preferred embodiments and all changes and modifications falling within the scope of the present application. Obviously, those skilled in the art can make various modifications and changes to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and changes of the present application fall within the scope of the present application and its equivalent technology, the present application also intends to include these modifications and changes.

Claims

1. A recyclable rocket separation multi-stage pneumatic pushrod, characterized by, At least comprising: A multi-stage pneumatic push rod arranged on the first separated body and a thrust support arranged on the second separated body; The multi-stage pneumatic push rod at least comprises a base, an outer cylinder, a first extended cylinder section and an inner cylinder; One end of the base is in communication with the inflation system, and the other end of the base is connected with one end of the outer cylinder; the inner side of the other end of the outer cylinder is provided with an outer cylinder inner stop ring; The outer side of one end of the first extended cylinder section is provided with a first outer stop ring, the inner side of one end of the first extended cylinder section is provided with a main inner stop ring, and the inner side of the other end of the first extended cylinder section is provided with a first inner stop ring; the first extended cylinder section is arranged in the outer cylinder; when retracted, the first outer stop ring is in contact 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 inflation system is supplied with gas and pushed out, the first outer stop ring is limited and connected with the outer cylinder inner stop ring, and the first inner stop ring is located outside the outer cylinder; One end of the inner cylinder is provided with an inner cylinder outer stop ring, and the other end of the inner cylinder is provided with an inner cylinder end; the inner cylinder is arranged in the first extended cylinder section; when retracted, the inner cylinder outer stop ring is in contact with the main inner stop ring; after the inflation system is supplied with gas and pushed out, the inner cylinder outer stop ring is limited and connected with the first inner stop ring, the inner cylinder end is located outside the first extended cylinder section, and the inner cylinder end is in contact with the thrust support, thereby realizing separation; The outer cylinder is further provided with an exhaust pipe; when the inflation system supplies gas to perform separation work, the exhaust pipe is closed; after separation is completed, the exhaust pipe is opened to quickly discharge the gas in the multi-stage pneumatic push rod and the inflation system, and the exhaust gas is used to do secondary work by using the reaction force of the exhaust gas on the air, thereby increasing the kinetic energy of the two stages of the rocket.

2. The recyclable rocket separation multi-stage pneumatic pushrod of claim 1, wherein, The multi-stage pneumatic push rod further comprises 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 lengthened cylinder section is arranged in the first lengthened cylinder section. When being contracted, the second outer blocking ring of the first second lengthened cylinder section is in contact with the main inner blocking ring, and the second inner blocking ring of the first second lengthened cylinder section is flush with the other end of the first lengthened cylinder section. After the inflation system is supplied with gas and pushed out, the second outer blocking ring of the first second lengthened cylinder section is in position connection with the first inner blocking ring, and the second inner blocking ring of the first second lengthened cylinder section is located outside the first lengthened cylinder section. The second second lengthened cylinder section is arranged in the first second lengthened cylinder section. When being contracted, the second outer blocking ring of the second second lengthened cylinder section is in contact with the main inner blocking ring, and the second inner blocking ring of the second second lengthened cylinder section is flush with the other end of the first second lengthened cylinder section. After the inflation system is supplied with gas and pushed out, the second outer blocking ring of the second second lengthened cylinder section is in position connection with the second inner blocking ring of the first second lengthened cylinder section, and the second inner blocking ring of the second second lengthened cylinder section is located outside the first second lengthened cylinder section. The Nth second lengthened cylinder section is arranged in the (N-1) th second lengthened cylinder section. When being contracted, the second outer blocking ring of the Nth second lengthened cylinder section is in contact with the main inner blocking ring, and the second inner blocking ring of the Nth second lengthened cylinder section is flush with the other end of the (N-1) th second lengthened cylinder section. After the inflation system is supplied with gas and pushed out, the second outer blocking ring of the Nth second lengthened cylinder section is in position connection with the second inner blocking ring of the (N-1) th second lengthened cylinder section, and the second inner blocking ring of the Nth second lengthened cylinder section is located outside the (N-1) th second lengthened cylinder section. The inner cylinder is arranged in the Nth second lengthened cylinder section. When being contracted, the outer blocking ring of the inner cylinder is in contact with the main inner blocking ring. After the inflation system is supplied with gas and pushed out, the outer blocking ring of the inner cylinder is in position connection with the second inner blocking ring of the Nth second lengthened cylinder section, the end of the inner cylinder is located outside the Nth second lengthened cylinder section, and the end of the inner cylinder is in contact with the thrust support, so that separation is realized.

3. The recyclable rocket separation multi-stage pneumatic pushrod of claim 2, wherein, The second lengthened cylinder section is one.

4. The recyclable rocket separation multi-stage pneumatic pushrod of claim 2, wherein, The first lengthened cylinder section is provided with a first dynamic sealing ring on the outside thereof, and the first dynamic sealing ring is located on the outside of the first outer blocking ring.

5. The recyclable rocket separation multi-stage pneumatic pushrod of claim 2, wherein, Each second lengthened cylinder section is provided with a second dynamic sealing ring on the outside thereof, and the second dynamic sealing ring is located on the outside of the second outer blocking ring.

6. The recyclable rocket separation multi-stage pneumatic pushrod of claim 2, wherein, The inner cylinder is provided with a third dynamic sealing ring on the outside thereof, and the third dynamic sealing ring is located on the outside of the outer blocking ring of the inner cylinder.

7. The recyclable rocket separation multi-stage pneumatic pushrod of claim 1, wherein, The end of the inner cylinder is a ball structure that can be adjusted.

8. The recyclable rocket separation multi-stage pneumatic pushrod of claim 1, wherein, The base is provided with a butt joint ring on the outside thereof. After the other end of the base is connected with one end of the outer cylinder, the one end of the outer cylinder is also in contact with the butt joint ring.

9. The recyclable rocket separation multi-stage pneumatic pushrod of claim 8, wherein, The butt joint ring is provided with a static sealing ring. After the other end of the base is connected with one end of the outer cylinder, the one end of the outer cylinder is also in contact with the static sealing ring.

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