CN219975220U - Reusable multi-stage composite buffer - Google Patents

Abstract

The utility model provides a reusable multi-stage composite buffer; the energy absorber comprises an inner cylinder, an outer cylinder and a buffer assembly, wherein one end of the outer cylinder and one end of the inner cylinder are plugged, the open end of the inner cylinder penetrates through the open end of the outer cylinder and stretches into the outer cylinder, and the inner cylinder is connected with the outer cylinder in an axial sliding manner; the buffer assembly comprises a friction baffle plate and a daub buffer, wherein the friction baffle plate is positioned between the inner cylinder and the outer cylinder, one end of a first reset spring is connected with the outer cylinder, the other end of the first reset spring is abutted against the friction baffle plate, the problems that the buffer is lower than energy absorption, poor in adaptability and incapable of being reused at present are solved, the multi-stage composite buffer energy absorption structure integrating bistable deformation energy absorption, friction energy consumption and elastic daub damping energy consumption is used as a whole, the energy absorption and adaptability are improved, the reset structure is matched, and after the buffer energy consumption is carried out, the reset of the buffer can be realized by utilizing the internal reset structure, so that the buffer is favorable for being reused.

Description

Reusable multi-stage composite buffer

Technical Field

The utility model relates to the field of buffering energy absorbers, in particular to a reusable multi-stage composite buffer.

Background

In the reusable rocket one-sub-level soft landing process, unrecoverable or controllable recovered deformation is generally required to be generated through a landing buffer device, and the kinetic energy of tens of kilojoules of the rocket body is dissipated, so that the rocket body is changed from motion to rest. The landing buffer device is mainly used for effectively reducing the impact load peak value and the deceleration of the rocket body by prolonging the duration of the impact load, thereby ensuring the safety of the rocket body structure and enabling the rocket body to achieve the aim of being reusable. Reusable launch vehicles and deep space probes that successfully achieve soft landing mostly employ leg landing cushioning mechanisms, where the bumpers are the core components,

chinese patent (publication No. CN112901699 a) discloses a buffer element and a power head buffer device having the same, which uses multi-stage energy consumption to consume energy in multiple stages, but has problems of lower specific energy consumption and poor adaptability, and when the buffer element is used as a leg buffer, the buffer element cannot be reused, so that it is difficult to meet the requirement of a reusable carrier rocket on a reusable buffer.

Disclosure of Invention

The utility model aims at overcoming the defects of the prior art, and provides a reusable multistage composite buffer, which integrates bistable deformation energy absorption, friction energy consumption and elastic cement damping energy consumption into a whole through a multi-stage composite buffer energy absorption structure of a collection structure, and is matched with a reset structure, so that after buffering energy consumption, the buffer can be reset by utilizing the internal reset structure, and the repeated use is facilitated.

In order to achieve the above purpose, the following technical scheme is adopted:

the reusable multistage composite buffer comprises an inner cylinder, an outer cylinder and a buffer assembly, wherein one end of the outer cylinder and one end of the inner cylinder are plugged, the open end of the inner cylinder penetrates through the open end of the outer cylinder and stretches into the outer cylinder, and the inner cylinder is connected with the outer cylinder in an axial sliding manner; the buffer assembly comprises a friction baffle plate and a cement buffer, the friction baffle plate is positioned between the inner cylinder and the outer cylinder, one end of the first return spring is connected with the outer cylinder, and the other end of the first return spring is abutted against the friction baffle plate; the daub buffer is positioned in the outer cylinder, one end of the daub buffer is abutted to the blocking end of the outer cylinder and is used for contacting the inner cylinder and consuming energy, one end of the second reset spring is abutted to the daub buffer, and the other end of the second reset spring penetrates through the opening end of the inner cylinder to enter the inner cylinder and is abutted to the blocking end of the inner cylinder.

Further, the first end of the outer barrel is abutted to the first mounting flange, the second end of the outer barrel is opened, the first end of the inner barrel is abutted to the second mounting flange, the second end of the inner barrel penetrates through the second end of the outer barrel to extend into the outer barrel, the inner barrel can axially move relative to the outer barrel, and the buffer assembly is located inside the outer barrel.

Further, a plugging cap is arranged at the opening position of the second end of the outer cylinder, a through hole for the inner cylinder to pass through is formed in the plugging cap, and the inner part of the outer cylinder is isolated from the outside through the plugging cap.

Further, the friction partition plate is annular and sleeved outside the inner cylinder, the inner ring of the friction partition plate is attached to the outer wall of the inner cylinder, so that energy is consumed through deformation and friction, and the outer ring of the friction partition plate is attached to the inner wall of the outer cylinder and keeps the relative position with the outer cylinder.

Further, a first step is arranged on the inner wall of the outer cylinder, and one side, close to the outer ring, of the end face of the friction partition plate contacts with the first step and is supported by the first step.

Further, a second step is arranged in the outer cylinder, one end of the first return spring is abutted against the second step, and one end of the first return spring, which is far away from the second step, acts on the friction partition plate through the sleeve.

Further, the daub buffer comprises a shell and a piston, wherein a cavity is formed in the shell, elastic daub is filled in the cavity, the piston is located in the cavity, one end of a piston rod is connected to the piston, the other end of the piston rod penetrates through the shell and then abuts against the blocking end of the outer cylinder, and an overflow channel for the elastic daub to penetrate through is formed in the piston.

Further, a guide rod is arranged on the shell of the cement buffer, the guide rod is connected to the shell through a disc seat, and the other end of the guide rod extends towards the direction of the inner cylinder and penetrates through the second end of the inner cylinder to penetrate into the inner cylinder.

Further, the second reset spring is sleeved outside the guide rod, one end of the second reset spring is abutted against the disc seat at the tail end of the guide rod, and the other end of the second reset spring extends into the inner cylinder and is abutted against the blocking end of the inner cylinder.

Further, the inner cylinder, the outer cylinder and the guide rod are coaxially arranged.

Compared with the prior art, the utility model has the advantages and positive effects that:

(1) Aiming at the problems that the prior buffer has low specific energy absorption, poor adaptability and can not be recycled, the specific energy absorption and the adaptability are improved through a multi-stage composite buffering energy absorption structure integrating bistable deformation energy absorption, friction energy consumption and elastic cement damping energy consumption, and the buffer can be reset by utilizing an internal reset structure after buffering energy consumption is carried out by matching with a reset structure, so that the buffer is favorable for being reused.

(2) After the energy consumption is finished, the first return spring under the compression action applies resilience force to the friction partition plate through the sleeve to push the friction partition plate to deform, and the first return spring pushes the friction partition plate to restore to the balance position; the second return spring under compression applies resilience force to the inner cylinder, and the return spring pushes the inner cylinder to restore to the initial position; after the acting force of the inner cylinder on the shell is removed, elastic daub in the cavity body, which is close to one side of the first mounting flange, of the piston passes through the overflow through hole and enters the other side, so that the shell moves towards the direction close to the inner cylinder until the initial position is restored, and the reusable multistage composite buffer after energy consumption is restored to the initial position through the combined action.

(3) Under the ideal landing working condition of the rocket, the landing buffering can be completed only through the deformation energy absorption and friction energy consumption of the first-stage structure; under the extreme landing working condition of the rocket, when the landing legs cannot land at the same time, the second-stage elastic clay buffer unit is triggered to act and consume energy, so that the rocket body is ensured to land stably.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model.

FIG. 1 is a schematic illustration of a reusable multi-stage composite buffer connection arrow body in accordance with an embodiment of the present utility model.

FIG. 2 is a schematic diagram of a reusable multi-stage composite buffer according to an embodiment of the present utility model.

Fig. 3 is a schematic view of the friction separator after deformation in an embodiment of the utility model.

FIG. 4 is a schematic diagram of an inner barrel abutting cement damper in an embodiment of the utility model.

FIG. 5 is a schematic diagram of the piston inside the cement buffer according to an embodiment of the present utility model.

FIG. 6 is a schematic diagram of a reusable multi-stage compound buffer after reset in accordance with an embodiment of the present utility model.

Fig. 7 is a graph of damping force versus damping stroke in an embodiment of the utility model.

In the figure, the arrow body 1, the main body 2, the main support 3, the first mounting flange 4, the second mounting flange 5, the cement buffer 6, the shell 7, the piston 8, the buffer cement 9, the guide rod 10, the second return spring 11, the first return spring 12, the sleeve 13, the friction baffle 14, the outer cylinder 15 and the inner cylinder 16.

Detailed Description

In an exemplary embodiment of the present utility model, as shown in fig. 1-7, a reusable multi-stage composite buffer is provided.

The existing buffer has the problems of lower energy absorption and poor adaptability, and meanwhile, when the buffer is used as a leg buffer, the buffer cannot be reused, so that the requirement of a reusable carrier rocket on the reusable buffer is difficult to meet.

Based on this, the embodiment provides a reusable multistage composite buffer, which is integrated with bistable deformation of a structure and elastic compression and energy absorption of a friction energy-consuming polymer cement material into a whole, and triggers the buffer action of different stages under different working conditions to ensure stable landing.

The reusable multi-stage composite buffer described above is described in detail below with reference to the accompanying drawings.

Referring to fig. 1, a reusable multi-stage composite damper is mounted between a main pillar 3 of a landing buffer mechanism and an arrow body 1, mounting flanges are respectively arranged at two ends of a main body 2 of the reusable multi-stage composite damper, one end of the main body 2 is connected with the arrow body 1 through a first mounting flange 4, and the other end is connected with the main pillar 3 through a second mounting flange 5.

The reusable multistage composite buffer mainly comprises an inner cylinder 16, an outer cylinder 15 and a buffer component, as shown in fig. 2, a first end of the outer cylinder 15 is abutted against the first mounting flange 4, a second end of the outer cylinder 15 is open, a first end of the inner cylinder 16 is abutted against the second mounting flange 5, a second end of the inner cylinder 16 penetrates through the second end of the outer cylinder 15 to extend into the outer cylinder 15, the inner cylinder 16 is in sliding fit with the outer cylinder 15, the inner cylinder 16 can move axially relative to the outer cylinder 15, the buffer component is located inside the outer cylinder 15, the inner cylinder 16 applies an action to the inner cylinder 16 through the buffer component, and the buffer component absorbs pressure in the moving process of the inner cylinder 16 relative to the outer cylinder 15.

The buffer assembly comprises a friction baffle 14 and a cement buffer 6, wherein the friction baffle 14 is annular and sleeved outside the inner cylinder 16, the inner ring of the friction baffle 14 is attached to the outer wall of the inner cylinder 16, the outer ring of the friction baffle 14 is attached to the inner wall of the outer cylinder 15 and keeps the relative position with the outer cylinder 15, and when the inner cylinder 16 slides along the axial direction, the first-stage buffer effect is achieved through the friction effect between the inner ring of the friction baffle 14 and the outer wall of the inner cylinder 16; the daub buffer 6 is located between the second end of the outer barrel 15 and the first mounting flange 4, the inner barrel 16 moves along the axial direction and gradually approaches the first mounting flange 4, the second end of the inner barrel 16 contacts and abuts against the daub buffer 6, when the daub buffer 6 receives the axial pressure applied by the inner barrel 16, the inner piston 8 is pushed to overcome the resistance movement of the inner daub, and the resistance to the inner barrel 16 is formed through the relative action between the inner piston 8 and the daub, so that the secondary buffer effect is achieved.

Specifically, as shown in fig. 2, a plugging cap is mounted at the opening position of the second end of the outer cylinder 15, a through hole for the inner cylinder 16 to pass through is formed in the plugging cap, and the interior of the outer cylinder 15 is isolated from the outside through the plugging cap. The inner wall of the outer cylinder 15 is provided with a first step, one side, close to the outer ring, of the end face of the friction partition 14 contacts with the first step, the first step is used for supporting, the position of the outer ring of the friction partition 14 is fixed, the inner ring of the friction partition 14 is attached to the outer wall of the inner cylinder 16, friction is formed between the inner ring and the inner cylinder 16, and relative movement between the inner cylinder 16 and the outer cylinder 15 is blocked.

Referring to fig. 2 and 3, the friction spacer 14 has a structure similar to a disc spring, the inner ring and the outer ring are positioned at different axial positions, and the convex surface of the friction spacer 14 faces the second mounting flange 5 in the initial state, as shown in fig. 2; along with the movement of the inner cylinder 16 relative to the outer cylinder 15, the inner cylinder 16 applies a thrust action to the friction partition 14, and the friction partition 14 is elastically deformed, so that the inner ring of the friction partition 14 passes through the axial position of the outer ring, and the concave surface of the friction partition 14 faces the second mounting flange 5. The energy consumption is carried out by bistable deformation of the friction diaphragm 14, as shown in stage i in fig. 6, consuming the interaction between the inner cylinder 16 and the outer cylinder 15.

With reference to fig. 3 and 4, as the inner cylinder 16 and the outer cylinder 15 move relatively, the second mounting flange 5 moves further toward the first mounting flange 4, the friction partition 14 remains fixed to the outer cylinder 15 under the restriction of the first step, the outer wall of the inner cylinder 16 moves against the friction of the inner ring of the friction partition 14, and the energy consumption is performed by using the friction during this relative movement, as shown in stage ii in fig. 6, to consume the interaction between the inner cylinder 16 and the outer cylinder 15.

As shown in fig. 4, the cement buffer 6 includes a housing 7 and a piston 8, a cavity is provided in the housing 7, elastic cement is filled in the cavity, the piston 8 is located in the cavity, one end of a rod of the piston 8 is connected to the piston 8, the other end of the rod of the piston 8 passes through the housing 7 and then abuts against the first mounting flange 4, and an overflow channel for the elastic cement to pass through is provided on the piston 8.

The second end of the inner cylinder 16 can be abutted against the shell 7 and push the shell 7 to move relative to the outer cylinder 15 and the piston 8, and in the process that the piston 8 moves along the inner wall of the cavity, elastic clay enters the other side of the piston 8 from one side of the piston 8 through the overflow channel, so that the effect of energy consumption is achieved.

With reference to fig. 4 and 5, as the inner barrel 16 moves relative to the outer barrel 15, the second end of the inner barrel 16 moves further towards the cement damper 6 until it contacts the cement damper 6, pushing the housing 7 against the outer barrel 15 after the inner barrel 16 applies pressure to the cement damper 6, and the piston 8 remains stationary relative to the outer barrel 15 during movement of the housing 7, whereby the damping cement 9 between the piston 8 and the inner barrel 16 is forced to consume energy while passing through the overflow channel into the cavity between the piston 8 and the first mounting flange 4, consuming energy by compression of the elastomeric cement, as shown in section iii in fig. 7, consuming the interaction between the inner barrel 16 and the outer barrel 15.

On the basis, the interaction buffer of the inner cylinder 16 and the outer cylinder 15 is achieved through multistage damping energy consumption, and the buffer assembly is reset through a reset structure.

As shown in fig. 2, a second step is arranged in the outer cylinder 15, a first return spring 12 is abutted on the second step, one end, far away from the second step, of the first return spring 12 acts on the friction partition 14 through a sleeve 13, and the elastic force of the first return spring 12 needs to be overcome when the friction partition 14 deforms. Since the friction diaphragm 14 is acted upon by the first return spring 12, the friction force can be stabilized as shown in stage ii of fig. 7.

After the energy consumption is finished, the first return spring 12 under the compression action applies resilience force to the friction partition 14 through the sleeve 13 to push the friction partition 14 to deform, and the first return spring 12 pushes the friction partition 14 to return to the balance position.

As shown in fig. 4 and 5, a guide rod 10 is mounted on the housing 7 of the cement damper 6, the guide rod 10 is connected to the housing 7, the other end extends toward the inner cylinder 16 and penetrates into the inner cylinder 16 through the second end of the inner cylinder 16, and the inner cylinder 16, the outer cylinder 15 and the guide rod 10 are coaxially arranged.

The guide rod 10 is sleeved with a second return spring 11, one end of the second return spring 11 is abutted against a disc seat at the tail end of the guide rod 10, the other end of the second return spring extends into the inner cylinder 16 and is abutted against the second mounting flange 5, and the second return spring 11 is compressed and accumulated to return force in the process that the inner cylinder 16 is close to the cement buffer 6.

After the energy consumption is finished, the second return spring 11 under the compression action applies a rebound force to the inner cylinder 16, and the return spring pushes the inner cylinder 16 to restore to the initial position.

As shown in fig. 5, after the energy consumption is completed, the elastic cement inside the cement buffer 6 is unevenly applied to the two sides of the piston 8, and after the acting force of the inner cylinder 16 on the shell 7 is removed, the elastic cement in the cavity of the piston 8 near one side of the first mounting flange 4 passes through the overflow through hole to enter the other side, so that the shell 7 moves towards the direction near the inner cylinder 16 until the initial position is restored.

The energy-consuming reusable multi-stage composite buffer is returned to its original position by the combined action of the cement buffer 6, the first return spring 12 and the second return spring 11, as shown in fig. 6.

A graph of damping force versus damping travel during energy consumption and during recovery is shown in fig. 7. The embodiment provides a multistage composite buffer integrating bistable deformation, friction energy consumption and elastic compression energy absorption of a polymer cement material. Under the ideal landing working condition of the rocket, the landing buffering can be completed only through the deformation energy absorption and friction energy consumption of the first-stage structure; under the extreme landing working condition of the rocket, when the landing legs cannot land at the same time, the second-stage elastic clay buffer unit is triggered to act and consume energy, so that the rocket body 1 is ensured to land stably.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (10)

1. The reusable multistage composite buffer is characterized by comprising an inner cylinder, an outer cylinder and a buffer assembly, wherein one end of the outer cylinder and one end of the inner cylinder are plugged, the open end of the inner cylinder penetrates through the open end of the outer cylinder and stretches into the outer cylinder, and the inner cylinder is axially and slidably connected with the outer cylinder;

the buffer assembly comprises a friction baffle plate and a cement buffer, the friction baffle plate is positioned between the inner cylinder and the outer cylinder, one end of the first return spring is connected with the outer cylinder, and the other end of the first return spring is abutted against the friction baffle plate; the daub buffer is positioned in the outer cylinder, one end of the daub buffer is abutted to the blocking end of the outer cylinder and is used for contacting the inner cylinder and consuming energy, one end of the second reset spring is abutted to the daub buffer, and the other end of the second reset spring penetrates through the opening end of the inner cylinder to enter the inner cylinder and is abutted to the blocking end of the inner cylinder.

2. The reusable multi-stage composite bumper of claim 1, wherein the first end of the outer cartridge is coupled to the first mounting flange and the second end of the outer cartridge is open, the first end of the inner cartridge is coupled to the second mounting flange, the second end of the inner cartridge extends into the outer cartridge through the second end of the outer cartridge, the inner cartridge is axially movable relative to the outer cartridge, and the bumper assembly is located within the outer cartridge.

3. The reusable multi-stage composite damper according to claim 2, wherein a plugging cap is installed at the opening of the second end of the outer tube, and a through hole through which the inner tube passes is formed in the plugging cap, and the interior of the outer tube is isolated from the outside by the plugging cap.

4. The reusable multi-stage composite damper according to claim 1, wherein the friction spacer is annular and sleeved outside the inner cylinder, the inner ring of the friction spacer engages the outer wall of the inner cylinder to allow the outer ring of the friction spacer to engage the inner wall of the outer cylinder and maintain the relative position with the outer cylinder by deformation and friction energy consumption.

5. The reusable multi-stage composite damper according to claim 4, wherein the inner wall of the outer tube is provided with a first step, and a side of the end surface of the friction spacer, which is adjacent to the outer ring, contacts the first step and is supported by the first step.

6. The reusable multi-stage composite damper according to claim 4 or 5, wherein the outer tube has a second step therein, one end of the first return spring is abutted against the second step, and one end of the first return spring remote from the second step acts on the friction spacer through the sleeve.

7. The reusable multistage composite damper according to claim 1, wherein the cement damper comprises a housing and a piston, wherein a cavity is arranged in the housing, the cavity is filled with elastic cement, the piston is arranged in the cavity, one end of a piston rod is connected with the piston, the other end of the piston rod passes through the housing and then abuts against the blocking end of the outer cylinder, and an overflow channel for the elastic cement to pass through is arranged on the piston.

8. The reusable multi-stage composite damper according to claim 7, wherein the cement damper has a housing provided with a guide rod connected to the housing by a disc seat, and the other end extends in the direction of the inner cylinder and extends into the inner cylinder through the second end of the inner cylinder.

9. The reusable multi-stage composite damper as recited in claim 8, wherein the second return spring is sleeved outside the guide rod, one end of the second return spring is abutted against the disk seat at the end of the guide rod, and the other end of the second return spring extends into the inner cylinder and is abutted against the blocking end of the inner cylinder.

10. The reusable multi-stage composite damper according to claim 8 or 9, wherein the inner barrel, outer barrel and guide rod are coaxially arranged.