Multi-stage pneumatic telescopic mechanism and rocket recovery supporting leg device

Abstract

The invention relates to the technical field of aerospace, and provides a multi-stage pneumatic telescopic mechanism and a rocket recovery landing leg device.The multi-stage pneumatic telescopic mechanism comprises a plurality of barrels which are arranged in a sliding and sleeving mode from inside to outside, and the barrel on the outermost side is provided with an unfolding inflation hole; in every two adjacent barrels, the outer barrel is provided with a vent hole, and the inner side of the outer barrel is provided with a locking part; a locking groove is formed in the inner side barrel body; the locking member has a locked state and an unlocked state. The locking component can be switched from the locking state to the unlocking state through the vent hole of the outermost cylinder body, so that the inner cylinder body slides to contract, and the vent holes of the two adjacent cylinder bodies are communicated under the condition that the two adjacent cylinder bodies are in the contraction state, so that the locking component is locked. The corresponding locking grooves are unlocked by all the locking parts by means of the vent holes of the outermost cylinder body; and extension of the multi-stage cylinder body is realized through the unfolding inflation hole, so that extension and retraction of the multi-stage cylinder body can be realized through the vent hole in the outermost cylinder body and the unfolding inflation hole, and the complexity of air path design is reduced.

Description

Technical Field

[0001] The present invention relates to the field of aerospace technology, and in particular to a multi-stage pneumatic telescopic mechanism and a rocket recovery leg device. Background Art

[0002] With the development of aerospace technology, the reusability of launch vehicles has become one of the key factors in reducing costs and improving efficiency. As an important means to achieve rocket reuse, vertical recovery technology has received widespread attention in recent years. At present, vertical recovery of launch vehicles is achieved by setting up structures such as telescopic legs and aerodynamic covers. During the flight of the launch vehicle, the telescopic legs are in a retracted state, located inside the aerodynamic cover and close to the surface of the rocket body. Before the launch vehicle lands vertically on the ground, the telescopic legs need to be extended and locked, and at the same time withstand the impact of the rocket body landing.

[0003] In the prior art, different gas sources are used for extending and unlocking the telescopic legs, which makes the gas circuit structure more complicated and the overall structure more complicated, resulting in poor operability during the maintenance process. Summary of the invention

[0004] The present invention provides a multi-stage pneumatic telescopic mechanism and a rocket recovery leg device, which are used to solve the defect of the relatively complex gas path structure in the prior art, reduce the complexity of the gas path, and thus reduce the difficulty of assembly and maintenance.

[0005] The present invention provides a multi-stage pneumatic telescopic mechanism, comprising a multi-stage sleeve, wherein the multi-stage sleeve comprises a plurality of cylinders which are sequentially slidably sleeved from the inside to the outside, and a first end of the outermost cylinder is provided with an expansion and inflation hole; In the two adjacent cylinders, the second end of the outer cylinder is provided with a vent hole, the inner side of the second end of the outer cylinder is configured with an installation space connected with the vent hole, the installation space is provided with a locking component, and the locking component has a first wedge surface; the inner cylinder is provided with a locking groove, and the groove wall of the locking groove has a first guiding inclined surface matched with the first wedge surface; The locking component has a locked state and an unlocked state. In the locked state, the two adjacent cylinders are unfolded, the locking component is clamped in the locking groove, and the first wedge-shaped surface abuts against the first guide slope; air is ventilated into the cylinder through the vent hole of the outermost cylinder to drive the locking component to disengage from the locking groove, so that the locking component is in the unlocked state, and the inner cylinder slides to contract. When the two adjacent cylinders are in the contracted state, the vent holes of the two adjacent cylinders are connected.

[0006] According to a multi-stage pneumatic telescopic mechanism provided by the present invention, the locking component comprises: A lock sleeve is arranged in the installation space, and the lock sleeve is arranged against the inner wall of the outer cylinder; A sliding member is slidably arranged on a side of the lock sleeve away from the inner cylinder, and a receiving groove is arranged on a side of the sliding member close to the lock sleeve; an air inlet cavity connected to the air vent is formed between the sliding member, the lock sleeve and the outer cylinder; A locking member partially penetrates the lock sleeve, and the first wedge-shaped surface is arranged on the inner side of the locking member; In the locked state, one end of the locking member is clamped in the locking groove, and the sliding member is pressed against the other end of the locking member; in the unlocked state, one end of the locking member is against the outer wall of the inner cylinder, and the other end of the locking member is located in the receiving groove.

[0007] According to a multi-stage pneumatic telescopic mechanism provided by the present invention, the outer side of the locking member has a second wedge-shaped surface, and the receiving groove has a second guiding inclined surface matched with the second wedge-shaped surface.

[0008] According to a multi-stage pneumatic telescopic mechanism provided by the present invention, the end of the locking member close to the locking groove is in a prism shape or a frustum shape, and / or the end of the locking member away from the locking groove is in a frustum shape or a prism shape.

[0009] According to a multi-stage pneumatic telescopic mechanism provided by the present invention, a guide member is provided between the sliding member and the inner wall of the outer cylinder.

[0010] According to a multi-stage pneumatic telescopic mechanism provided by the present invention, in two adjacent cylinders, the second end of the outer cylinder is connected to a sealing cover sleeved on the inner cylinder, and the inner wall of the outer cylinder has an extension plate, and an installation space is formed between the extension plate, the inner wall of the outer cylinder and the sealing cover.

[0011] According to a multi-stage pneumatic telescopic mechanism provided by the present invention, an elastic member is arranged between the extension plate and the sliding member, the elastic member has a first compression state and a second compression state, the first compression state is smaller than the deformation amount of the second compression state; the locking sleeve has a first limiting portion; In the locked state, one end of the sliding member close to the sealing cover abuts against the first limiting portion, and the elastic member is in a first compressed state; in the unlocked state, the sliding member is away from the first limiting portion, and the elastic member is in a second compressed state.

[0012] According to a multi-stage pneumatic telescopic mechanism provided by the present invention, a sealing member is provided at least one of between the sliding member and the outer cylinder, between the sliding member and the locking sleeve, between the locking sleeve and the inner cylinder, and between the sealing cover and the inner cylinder.

[0013] According to a multi-stage pneumatic telescopic mechanism provided by the present invention, a buffer damper is arranged at the second end of the innermost cylinder.

[0014] The present invention also provides a rocket recovery leg device, comprising a rocket body and the multi-stage pneumatic telescopic mechanism described in any one of the above items, wherein the outermost cylinder is connected to the rocket body.

[0015] The multi-stage pneumatic telescopic mechanism provided by the present invention can realize the switching of the locking component from the locked state to the unlocked state through the vent hole of the outermost cylinder, so that the inner cylinder slides to shrink. When the two adjacent cylinders are in the contracted state, the vent holes of the two adjacent cylinders are connected, so that all the locking components can unlock the corresponding locking grooves with the help of the vent hole of the outermost cylinder, thereby realizing the contraction of the multi-stage sleeve; and the extension of the multi-stage cylinder is realized by expanding the inflation hole. In this way, the expansion and contraction of the multi-stage cylinder can be realized through the vent hole and the expanding inflation hole on the outermost cylinder, so that the expansion and contraction of the telescopic mechanism can be realized through a set of air supply system, which can reduce the complexity of the air path design. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 This is one of the structural schematic diagrams of the multi-stage pneumatic telescopic mechanism provided by the present invention.

[0018] Figure 2 yes Figure 1 AA section view of the structure.

[0019] Figure 3 yes Figure 2 Schematic diagram of the local enlarged structure at point B in the middle.

[0020] Figure 4 This is the second structural schematic diagram of the multi-stage pneumatic telescopic mechanism provided by the present invention.

[0021] Figure 5 This is the third structural schematic diagram of the multi-stage pneumatic telescopic mechanism provided by the present invention.

[0022] Figure 6 yes Figure 5 Schematic diagram of the partial enlarged structure at point C in the middle.

[0023] Figure 7 It is a structural schematic diagram of the locking member provided by the present invention.

[0024] Reference numerals: 100, cylinder; 101, locking groove; 102, vent hole; 103, air inlet cavity; 110, primary cylinder; 111, primary sealing cover; 120, secondary cylinder; 121, secondary sealing cover; 122, connecting hole; 130, tertiary cylinder; 200, end cap; 210, expansion and inflation hole; 220, arrow body connection hole; 300, locking member; 310, lock sleeve; 311, air intake passage; 320, sliding member; 321, storage groove; 330, locking member; 331, first locking portion; 332, second locking portion; 340, elastic member; 350, guide member; 301, primary locking component; 302, secondary locking component; 400, seals; 500, buffer damper; 510, outer cover connection hole. DETAILED DESCRIPTION

[0025] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0026] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0027] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0028] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0029] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0030] Combine the following Figure 1-Figure 7 The multi-stage pneumatic telescopic mechanism of the present invention is described.

[0031] The embodiment of the first aspect of the present invention provides a multi-stage pneumatic telescopic mechanism, such as Figures 1 to 4 As shown, the multi-stage pneumatic telescopic mechanism includes a multi-stage sleeve, which includes a plurality of cylinders 100 that are slidably sleeved in sequence from the inside to the outside, and a first end of the outermost cylinder 100 is provided with an expansion and inflation hole 210.

[0032] In two adjacent cylinders 100, the second end of the outer cylinder 100 is provided with a vent hole 102, and the inner side of the second end of the outer cylinder 100 is constructed with an installation space connected to the vent hole 102, and the installation space is provided with a locking component 300, and the locking component 300 has a first wedge surface; the inner cylinder 100 is provided with a locking groove 101, and the groove wall of the locking groove 101 has a first guide inclined surface matching the first wedge surface.

[0033] The locking component 300 has a locked state and an unlocked state. When the multi-stage sleeve is in an extended state, two adjacent cylinders 100 are unfolded, and the locking component 300 is clamped in the corresponding locking groove 101, and the first wedge surface is against the first guide slope, and the locking component 300 is in a locked state; air is ventilated into the outermost cylinder 100 through the vent hole 102 of the outermost cylinder 100 to drive the locking component 300 in the outermost cylinder 100 to disengage from the locking groove 101, so that the locking component 300 is in an unlocked state, and the inner cylinder 100 slides to shrink. When the two adjacent cylinders 100 are in a contracted state, the vent holes 102 of the two adjacent cylinders 100 are connected, so that the multiple cylinders 100 gradually shrink from the outside to the inside.

[0034] It can be understood that the expansion and inflation holes 210 and the vent holes 102 of the outermost cylinder 100 are connected to the air supply system; the expansion and inflation holes 210 are used to ventilate the cylinder 100, while the vent holes 102 are used to exhaust air outwards, and the multiple cylinders 100 are relatively slid and expanded, such as Figure 2 As shown, the multi-stage sleeve is in an extended state. At this time, the locking component 300 between two adjacent cylinders 100 is locked in the corresponding locking groove 101, and the locking component 300 is in a locked state.

[0035] Air is ventilated into the outermost installation space through the air vent 102 of the outermost cylinder 100, and at the same time, exhaust is exhausted outwardly so that the locking component 300 on the outermost cylinder 100 releases the lock on the locking groove 101 on the inner cylinder 100, and the locking component 300 is in an unlocked state, so that the inner cylinder 100 can slide relative to the outer cylinder 100 to shrink. When two adjacent cylinders 100 are in a contracted state, the air vents 102 of the two adjacent cylinders 100 are connected, thereby realizing the unlocking of the locking groove 101 by the locking component 300 between the next two adjacent cylinders 100, so that the multiple cylinders 100 shrink step by step from the outside to the inside, and the multi-stage sleeve is in a retracted state.

[0036] The multi-stage pneumatic telescopic mechanism provided by the embodiment of the present invention can realize the switching of the locking component 300 from the locked state to the unlocked state through the vent hole 102 of the outermost cylinder 100, so that the inner cylinder 100 slides to shrink. When two adjacent cylinders 100 are in the contracted state, the vent holes 102 of the two adjacent cylinders 100 are connected, so that all the locking components 300 can unlock the corresponding locking grooves 101 with the help of the vent hole 102 of the outermost cylinder 100, thereby realizing the contraction of the multi-stage sleeve; and the extension of the multi-stage cylinder 100 is realized by the expansion and inflation hole 210. In this way, the expansion and contraction of the multi-stage cylinder 100 can be realized through the vent hole 102 on the outermost cylinder 100 and the expansion and inflation hole 210, so that the expansion and contraction of the telescopic mechanism can be realized through a set of air supply system, which can reduce the complexity of the air path design.

[0037] It should be noted that a locking component 300 is provided between every two cylinders 100, and a multi-stage sleeve includes three or more cylinders 100. The multi-stage sleeve is provided with multiple locking components 300. If each locking component 300 uses an independent gas source, the gas circuit structure is complicated, and the operation is difficult during assembly and maintenance, and the gas volume requirement is large. The present invention only requires the vent hole 102 on the outermost cylinder 100 and the expansion and inflation hole 210 to be connected to the gas supply system, which can greatly simplify the gas supply system and the demand, and the gas supply system is simply connected to the telescopic mechanism gas circuit, thereby reducing the difficulty of assembly and maintenance.

[0038] For example, Figure 2 and Figure 4 As shown, the sleeve has three levels, and the multi-level sleeve includes three cylinders 100, which are respectively a primary cylinder 110, a secondary cylinder 120 and a tertiary cylinder 130 connected sequentially from left to right. The left end of the primary cylinder 110 is connected to an end cover 200, and the primary cylinder 110 and the end cover 200 are mechanically airtightly connected. The end cover 200 is provided with an expansion and inflation hole 210, and the secondary cylinder 120 can be slidably sleeved in the primary cylinder 110, and the tertiary cylinder 130 can be slidably sleeved in the secondary cylinder 120, so that the cylinders 100 of each level can be slidably sleeved together in sequence. It should be noted that the number of cylinders 100 can be two or four, etc., and the specific number of cylinders 100 can be set according to needs.

[0039] A vent hole 102 is provided at the right end of the primary cylinder 110, and the vent hole 102 serves as an unlocking air inlet; an installation space (referred to as the primary installation space) is constructed on the inner side of the right end of the primary cylinder 110, and a locking component 300 (referred to as the primary locking component 301) is arranged in the primary installation space, and the inner side of the locking component 300 has a first wedge-shaped surface; a locking groove 101 (referred to as the primary locking groove 101) is provided on the outer wall of the secondary cylinder 120 to cooperate with the primary locking component 301; a vent hole 102 is provided at the right end of the secondary cylinder 120, and the vent hole 102 serves as a connecting hole 122; a secondary installation space is constructed on the inner side of the right end of the secondary cylinder 120, and a secondary locking component 302 is arranged in the secondary installation space, and the inner side of the secondary locking component 302 has a first wedge-shaped surface; a secondary locking groove 101 cooperating with the secondary locking component 302 is provided on the outer wall of the tertiary cylinder 130.

[0040] The gas supply system introduces gas into the primary cylinder 110 by expanding the inflation hole 210, and the gas pushes the secondary cylinder 120 and the tertiary cylinder 130 to slide outward (to the right) of the primary sleeve until the primary locking component 301 is locked in the primary locking groove 101, and the secondary locking component 302 is locked in the secondary locking groove 101, that is, the primary locking component 301 and the secondary locking component 302 are both in a locked state, and the gas supply is stopped, and the multi-stage sleeve is in an extended state, such as Figure 2During the folding process of the multi-stage sleeve, the gas supply system introduces gas (high pressure gas) from the unlocking gas inlet, and the gas switches the primary locking component 301 from the locked state to the unlocked state, and drives the secondary cylinder 120 to slide leftward to shrink through external force. When the secondary cylinder 120 is completely shrunk into the primary cylinder 110, as shown in FIG. Figure 5 and Figure 6 As shown, the secondary cylinder 120 and the primary cylinder 110 are in a contracted state, at which time the vent hole 102 of the primary cylinder 110 is connected to the communication hole 122 of the secondary cylinder 120, and the gas switches the secondary locking component 302 from a locked state to an unlocked state; the tertiary cylinder 130 is pushed to slide to the left by an external force to contract, so as to realize the gradual contraction of the multiple cylinders 100 from the outside to the inside, as shown in FIG. Figure 4 shown.

[0041] It should be noted that the multi-stage sleeve includes a plurality of cylinders 100 which are slidably mounted in sequence from the inside to the outside. Except for the innermost cylinder 100 which is not designed with a vent hole 102, the other cylinders 100 are provided with a vent hole 102. The outermost cylinder 100 has a vent near the right end as the vent hole 102 of the first-stage cylinder 110 to facilitate connection with the air supply system; all cylinders 100 except the outermost cylinder 100 and the innermost cylinder 100 have a plurality of circumferentially arranged small vent holes near the right end, and the plurality of small vent holes serve as the connecting holes 122 of the cylinders 100. It should be noted here that there is a gap between two adjacent cylinders 100. When the two adjacent cylinders 100 are in a contracted state, a gas accommodating chamber is formed between the two adjacent cylinders 100, and the gas accommodating chamber is connected to the air vents of the outer cylinder and the air vents of the inner cylinder respectively; the gas enters the cylinder 100 through the air vents 102 of the outermost cylinder, and enters the gas accommodating chamber. After the gas accommodating chamber is pressurized equally, it enters the connecting holes 12 of the inner cylinder from multiple small ventilation holes.

[0042] In one embodiment of the present invention, Figure 3 As shown, in two adjacent cylinders 100, an installation space is formed at the right end of the outer cylinder 100, and a locking groove 101 is provided at the left end of the inner cylinder 100; the locking component 300 includes a lock sleeve 310, a sliding member 320 and a locking member 330, the lock sleeve 310 is arranged in the installation space, and the lock sleeve 310 is abutted against the inner wall of the outer cylinder 100; the sliding member 320 is slidably arranged on the side of the lock sleeve 310 away from the inner cylinder 100, and abutted against the inner wall of the outer cylinder 100, and a receiving groove 321 is provided on the side of the sliding member 320 close to the lock sleeve 310; the sliding member 320, the lock sleeve 310 and the outer cylinder 100 surround an air inlet cavity 103 connected to the vent hole 102; the locking member 330 is partially penetrated through the lock sleeve 310, and the first wedge surface is arranged on the inner side of the locking member 330.

[0043] like Figure 6As shown, the locking member 300 is in the locked state, one end of the locking member 330 is clamped in the locking groove 101, and the sliding member 320 is pressed against the other end of the locking member 330, referring to Figure 6 The locking member 300 is located at the lower side; the locking member 300 is in the unlocked state, one end of the locking member 330 is against the outer wall of the inner cylinder 100, and the other end of the locking member 330 is located in the receiving groove 321, with reference to Figure 6 The locking component 300 is located on the upper side.

[0044] Specifically, the left end of the outermost cylinder 100 is connected to the end cap 200. In the two adjacent cylinders 100, an installation space is formed inside the right end of the outer cylinder 100. The lock sleeve 310 is arranged in the installation space of the outer cylinder 100. The lock sleeve 310 is slidably matched with the inner cylinder 100. An installation cavity is constructed between the lock sleeve 310 and the inner wall of the outer cylinder 100. The sliding member 320 is slidably arranged in the installation cavity. The sliding member 320 and the lock sleeve 310, The sliding member 320 and the inner wall of the outer cylinder 100 are in sliding fit, and an air inlet cavity 103 is formed between the right side of the sliding member 320, the outer cylinder 100 and the locking sleeve 310. The air inlet cavity 103 is connected to the air vent 102. The locking sleeve 310 is provided with an air inlet passage 311 connected to the air inlet cavity 103. When two adjacent cylinders 100 are in a contracted state, the air vents 102 of the two cylinders 100 are connected through the air inlet cavity 103 and the air inlet passage 311.

[0045] It is understandable that if Figure 4 As shown, when the multi-stage sleeve is in the retracted state, the multiple cylinders 100 are sleeved from the outside to the inside. At this time, the locking component 300 is in the unlocked state, one end of the locking member 330 is against the outer wall of the inner cylinder 100, and the other end of the locking member 330 is located in the storage groove 321 of the sliding member 320; air is ventilated into the cylinder 100 through the expansion hole 210, and the multiple cylinders 100 are relatively slid and expanded, so that the multi-stage sleeve is in the extended state, until one end of the locking member 330 is clamped in the locking groove 101, and the sliding member 320 is pressed on the other end of the locking member 330. At this time, the locking component 300 is in the locked state, as shown in FIG. Figure 2 and Figure 3 shown.

[0046] The air is ventilated into the outermost air inlet cavity 103 through the vent hole 102 of the outermost cylinder 100, so that the sliding member 320 of the outermost locking member 300 moves to the left, so that the receiving groove 321 of the sliding member 320 corresponds to the position of the locking member 330, and a leftward force is applied to the inner cylinder 100, so that the first guiding inclined surface of the locking groove 101 on the inner cylinder 100 moves along the first wedge surface of the locking member 330, thereby converting the lateral movement of the inner cylinder 100 into the upward movement of the locking member 330, so that the locking member 330 moves from the locking groove 101. 01 and placed in the receiving groove 321, so that one end of the locking member 330 is against the outer wall of the inner cylinder 100, and the other end of the locking member 330 is located in the receiving groove 321, and the locking member 330 is unlocked to lock the locking groove 101, so that the locking member 300 is in an unlocked state, and the inner cylinder 100 moves to the left to shrink; when the two adjacent cylinders 100 are in a contracted state, the vents 102 of the two adjacent cylinders 100 are connected, so that the multiple cylinders 100 gradually shrink from the outside to the inside, and the multi-stage sleeve is in a retracted state. It should be noted here that after the two adjacent cylinders 100 are unlocked and the two cylinders 100 are retracted into place, the air inlet cavities 103 set on the two cylinders 100 are connected, so as to realize the unlocking of the locking member 300 to the locking groove 101 between the next two adjacent cylinders 100, and so on, the unlocking between all cylinders 100 can be realized with the help of an unlocking air inlet.

[0047] In one embodiment of the present invention, in two adjacent cylinders 100, the second end portion of the outer cylinder 100 is connected to a sealing cover mounted on the inner cylinder 100, and the inner wall of the outer cylinder 100 has an extension plate, and an installation space is formed between the extension plate, the inner wall of the outer cylinder 100 and the sealing cover; the vent hole 102 is located between the sealing cover and the extension plate.

[0048] It is understandable that the inner wall of the outer cylinder 100 has an extension plate, and the space enclosed between the extension plate and the outer cylinder 100 is used to install the lock sleeve 310, the elastic member 340, and the sliding member 320, and the lock sleeve 310 is pressed against the outer cylinder 100 through the sealing cover. It should be noted that during the expansion and contraction of the inner cylinder 100 relative to the outer cylinder 100, the lock sleeve 310, the elastic member 340, the locking member 330 and the outer cylinder 100 remain relatively still, so the gas demand is relatively small, which effectively reduces the volume and capacity of the gas cylinder of the gas supply system carried by the rocket.

[0049] Optionally, an elastic member 340 is arranged between the extension plate and the sliding member 320, and the elastic member 340 is sleeved on the lock sleeve 310. The elastic member 340 has a first compression state and a second compression state, and the deformation in the first compression state is smaller than that in the second compression state; the outer wall of the lock sleeve 310 has a first limiting portion; in the locked state, one end of the sliding member 320 close to the sealing cover is against the first limiting portion, and the elastic member 340 is in the first compression state; in the unlocked state, the sliding member 320 is away from the first limiting portion, and the elastic member 340 is in the second compression state.

[0050] It can be understood that during the extension of the multi-stage sleeve, the locking member 330 is clamped in the locking groove 101, the elastic member 340 is extended (from the second compression state to the first compression state), pushing the sliding member 320 to move to the right, and causing the right side of the sliding member 320 to contact the first limit portion.

[0051] In this embodiment, the elastic member 340 is an elastic material member such as a compression spring or a high-elastic rubber; the locking member 330 adopts a tenon, which can be a square tenon.

[0052] For example, an annular notch is formed on the outer wall of one end of the lock sleeve 310 close to the extension plate, and the elastic member 340 and the sliding member 320 are installed in the annular notch, and the side wall of the annular notch forms a first limiting portion.

[0053] Furthermore, a second limiting portion is provided on the outer wall of the locking sleeve or the inner wall of the outer cylinder 100. In the unlocked state, the sliding member 320 is away from the first limiting portion and is against the second limiting portion, and the second limiting portion constrains the distance that the sliding member 320 moves in the direction of the elastic member 340; thereby, the sliding range of the sliding member 320 is limited by the first limiting portion and the second limiting portion, and a force is provided when the multi-stage sleeve is in an extended state or a retracted state to maintain a state balance.

[0054] In one embodiment of the present invention, in two adjacent cylinders 100, a guide member 350 is provided between the sliding member 320 and the inner wall of the outer cylinder 100. For example, a guide groove is provided on the outer wall of the sliding member 320, and the guide member 350 is a guide ring installed in the guide groove.

[0055] Furthermore, the lock sleeve 310 is provided with a plurality of mounting holes in the radial direction, and the plurality of mounting holes are arranged in the circumferential direction, and then there are a plurality of locking members 330, and the plurality of locking members 330 are respectively installed in the plurality of mounting holes; preferably, the plurality of locking members 330 are evenly arranged in the circumferential direction. There may also be a plurality of locking grooves 101, or they may be annular grooves arranged in the circumferential direction of the inner cylinder 100.

[0056] In one embodiment of the present invention, the inner side of the locking piece 330 has a first locking portion 331, the side of the first locking portion 331 is a first wedge-shaped surface, and the locking groove 101 has a first guide slope that cooperates with the first wedge-shaped surface to increase the matching area between the locking piece 330 and the locking groove 101, thereby improving the load-bearing capacity.

[0057] Specifically, when the multi-stage sleeve is in the extended state, the locking piece 330 is clamped in the locking groove 101, and the first guide slope and the first wedge surface are in contact. During the contraction of the multi-stage sleeve, as the two adjacent cylinders 100 slide relative to each other, the first wedge surface moves along the first guide slope, pushing the locking piece 330 out of the locking groove 101.

[0058] It is understandable that when the multi-stage sleeve is in the extended state, the locking member 330 is clamped in the locking groove 101, and the first guide slope and the first wedge-shaped surface are in contact. When the multi-stage sleeve needs to be shortened, the gas in each cylinder 100 is first released to move the inner cylinder 100 toward the inner side of the outer cylinder 100, and the gas is introduced into the unlocking air inlet to push the sliding member 320 to move to the left side. The notch of the receiving groove 321 is opposite to the locking member 330, and the inner cylinder 100 moves to the left to move the first guide slope along the first wedge-shaped surface, thereby converting the lateral movement of the inner cylinder 100 into the upward movement of the locking member 330, so that the locking member 330 is disengaged from the locking groove 101 and placed in the receiving groove 321.

[0059] For example, the first wedge surface is provided at one end of the locking member 330 close to the locking groove 101. Optionally, the end of the locking member 330 close to the locking groove 101 is truncated cone-shaped; of course, the end of the locking member 330 close to the locking groove 101 may also be truncated cone-shaped.

[0060] Optionally, the outer side of the locking member 330 has a second locking portion 332 , the side surface of the second locking portion 332 is a second wedge-shaped surface, and the receiving groove 321 of the sliding member 320 has a second guiding inclined surface matched with the second wedge-shaped surface.

[0061] Specifically, when the multi-stage sleeve is in a retracted state, the second guide bevel and the second wedge-shaped surface are in contact with each other; during the extension process of the multi-stage sleeve, as the inner cylinder 100 moves relative to the locking component 300 on the outer cylinder 100, the second guide bevel moves along the second wedge-shaped surface, pushing the locking member 330 to move into the locking groove 101.

[0062] It is understandable that when the multi-stage sleeve is in the contracted state, the first guide slope and the first wedge-shaped surface are in contact. When the multi-stage sleeve needs to be extended, as the gas discharged into the cylinder 100 increases, the multi-stage sleeve extends, and when the locking member 330 corresponds to the locking groove 101, the elastic member 340 pushes the sliding member 320 to move to the right, so that the first guide slope moves along the first wedge-shaped surface, thereby converting the lateral movement of the sliding member 320 into the downward movement of the locking member 330, so that the locking member 330 is clamped in the locking groove 101.

[0063] For example, the second wedge-shaped surface is provided at the end of the locking member 330 away from the locking groove 101. Optionally, the end of the locking member 330 away from the locking groove 101 is in a frustum shape; of course, the end of the locking member 330 away from the locking groove 101 may also be in a truncated cone shape. Preferably, the end of the locking member 330 away from the locking groove 101 is in a truncated cone shape, and the end of the locking member 330 close to the locking groove 101 is in a frustum shape.

[0064] In one embodiment of the present invention, a seal 400 is provided at least one of between the slider 320 and the outer cylinder 100 , between the slider 320 and the lock sleeve 310 , between the lock sleeve 310 and the inner cylinder 100 , and between the sealing cover and the inner cylinder 100 .

[0065] Specifically, a sealing cover slidably mounted on the inner cylinder 100 is provided at one end of the outer cylinder 100 away from the end cover 200, and the right side of the first-stage cylinder 110 is connected to the first-stage sealing cover 111, and the first-stage sealing cover 111 is slidably mounted on the second-stage cylinder 120, and the right side of the second-stage cylinder 120 is connected to the second-stage sealing cover 121, and the second-stage sealing cover 121 is slidably mounted on the third-stage cylinder 130.

[0066] In two adjacent cylinders 100, a seal 400 is arranged between the sliding member 320 and the inner wall of the outer cylinder 100, and a seal 400 is arranged between the sliding member 320 and the outer wall of the locking sleeve 310 to achieve sealing of the air inlet chamber 103; a seal 400 is arranged between the locking sleeve 310 and the outer wall of the inner cylinder 100; and a seal 400 is arranged between the sealing cover and the inner cylinder 100.

[0067] Optionally, two seals 400 are disposed between the lock sleeve 310 and the outer wall of the inner cylinder 100 . The two seals 400 are respectively located on the left and right sides of the locking member 330 . A sealing groove for installing the seals 400 is disposed on the lock sleeve 310 .

[0068] It is understandable that if Figure 3 and Figure 6As shown, the secondary cylinder 120 is completely retracted into the primary cylinder 110, and there is a gap between the lock sleeve 310 of the primary locking component and the secondary cylinder 120. A seal 400 is provided between the lock sleeve 310 and the outer wall of the inner cylinder 100 on the right side, and between the sealing cover and the inner cylinder 100 to seal the gap space between the lock sleeve 310 and the secondary cylinder 120, thereby forming a gas containing chamber between the lock sleeve 310 and the secondary cylinder 120 that is connected to the air inlet channel 311 and the connecting hole 122 on the secondary cylinder 120.

[0069] It should be noted that the seal 400 does not affect the sliding of the sliding member 320 and the sliding between two adjacent cylinders 100 while achieving sealing; for example, the seal 400 can be an O-type or Y-type sealing ring.

[0070] In one embodiment of the present invention, a buffer damper 500 is provided at one end of the innermost cylinder 100 away from the end cover 200. The buffer damper 500 is provided with an outer cover connecting hole 510, and the outer cover connecting hole 510 is used to connect with the pneumatic outer cover.

[0071] For example, the right end of the third-stage cylinder 130 is mechanically connected to the damper 500 through a thread or a flange, and the buffer damper 500 can be an oil-gas damper, a honeycomb damper or other damping structures.

[0072] An embodiment of the second aspect of the present invention proposes a rocket recovery leg device, which includes a rocket body and a multi-stage pneumatic telescopic mechanism provided by any of the above embodiments, and an end cover 200 is connected to the rocket body.

[0073] Among them, the end cover 200 of the multi-stage pneumatic telescopic mechanism is provided with an arrow body connecting hole 220, and the arrow body connecting hole 220 is connected to the arrow body.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-stage pneumatic telescopic mechanism, characterized in that: It comprises a multi-stage sleeve, wherein the multi-stage sleeve comprises a plurality of cylinders which are sequentially slidably sleeved from the inside to the outside, and a first end of the outermost cylinder is provided with an expansion and inflation hole; In the two adjacent cylinders, the second end of the outer cylinder is provided with a vent hole, the inner side of the second end of the outer cylinder is configured with an installation space connected with the vent hole, the installation space is provided with a locking component, and the locking component has a first wedge surface; the inner cylinder is provided with a locking groove, and the groove wall of the locking groove has a first guiding inclined surface matched with the first wedge surface; The locking component has a locked state and an unlocked state. In the locked state, two adjacent cylinders are unfolded, the locking component is clamped in the locking groove, and the first wedge surface abuts against the first guide inclined surface. Air is ventilated into the cylinder through the vent hole of the outermost cylinder to drive the locking component to disengage from the locking groove, so that the locking component is in an unlocked state, and the inner cylinder slides to contract. When the two adjacent cylinders are in the contracted state, the vent holes of the two adjacent cylinders are connected.

2. The multi-stage pneumatic telescopic mechanism according to claim 1, characterized in that: The locking component comprises: A lock sleeve is arranged in the installation space, and the lock sleeve is arranged against the inner wall of the outer cylinder; A sliding member is slidably arranged on a side of the lock sleeve away from the inner cylinder, and a receiving groove is arranged on a side of the sliding member close to the lock sleeve; an air inlet cavity connected to the air vent is formed between the sliding member, the lock sleeve and the outer cylinder; A locking member partially penetrates the lock sleeve, and the first wedge-shaped surface is arranged on the inner side of the locking member; In the locked state, one end of the locking member is clamped in the locking groove, and the sliding member is pressed against the other end of the locking member; in the unlocked state, one end of the locking member is against the outer wall of the inner cylinder, and the other end of the locking member is located in the receiving groove.

3. The multi-stage pneumatic telescopic mechanism according to claim 2, characterized in that: The outer side of the locking piece has a second wedge-shaped surface, and the receiving groove has a second guiding inclined surface matched with the second wedge-shaped surface.

4. The multi-stage pneumatic telescopic mechanism according to claim 3, characterized in that: One end of the locking piece close to the locking groove is in a prism shape or a frustum shape, and / or one end of the locking piece away from the locking groove is in a frustum shape or a prism shape.

5. The multi-stage pneumatic telescopic mechanism according to claim 2, characterized in that: A guide member is arranged between the sliding member and the inner wall of the outer cylinder.

6. The multi-stage pneumatic telescopic mechanism according to claim 2, characterized in that: In two adjacent cylinders, the second end of the outer cylinder is connected to a sealing cover sleeved on the inner cylinder, the inner wall of the outer cylinder has an extension plate, and the installation space is formed between the extension plate, the inner wall of the outer cylinder and the sealing cover.

7. The multi-stage pneumatic telescopic mechanism according to claim 6, characterized in that: An elastic member is arranged between the extension plate and the sliding member, the elastic member has a first compression state and a second compression state, the first compression state is smaller than the deformation amount of the second compression state; the lock sleeve has a first limiting portion; In the locked state, one end of the sliding member close to the sealing cover abuts against the first limiting portion, and the elastic member is in a first compressed state; In the unlocked state, the sliding member is away from the first limiting portion, and the elastic member is in a second compressed state.

8. The multi-stage pneumatic telescopic mechanism according to claim 6, characterized in that: A sealing member is provided at least one of between the sliding member and the outer cylinder, between the sliding member and the lock sleeve, between the lock sleeve and the inner cylinder, and between the sealing cover and the inner cylinder.

9. The multi-stage pneumatic telescopic mechanism according to any one of claims 1 to 7, characterized in that: A buffer damper is arranged at the second end of the innermost cylinder.

10. A rocket recovery outrigger device, characterized in that: It comprises an arrow body and a multi-stage pneumatic telescopic mechanism as claimed in any one of claims 1 to 9, wherein the outermost cylinder is connected to the arrow body.

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