A passive closing device for a space rope net

Abstract

The present invention discloses a passive closing device for a space rope net, comprising: a housing, a delayed ignition device, a cutter, a pulley assembly, a closing rope, a reel-type ejector and a steel wire rope; wherein, the delayed ignition device is arranged at the inner end of the bottom of the housing; the cutter is arranged on top of the delayed ignition device; the inner wall of one end of the reel-type ejector is connected to the outer surface of the cutter; the pulley assembly is connected to the top of the cutter and the pulley assembly is located inside the reel-type ejector; both ends of the steel wire rope are connected to the top end cover of the reel-type ejector, and the middle part of the steel wire rope passes through a through hole formed in the cutter; one end of the closing rope is connected to the top end cover of the reel-type ejector, and the other end of the closing rope bypasses the pulley assembly and extends out through a second through hole formed in the top end cover of the reel-type ejector. The present invention has the characteristics of simple structure, high reliability and anti-loosening.

Description

Technical Field

[0001] The invention belongs to the technical field of space applications, and particularly relates to a passive closing device for a space net. Background Art

[0002] The space net is a new space control concept proposed in recent years. Compared with the traditional mechanical arm capture method, the net capture method has the advantages of a large capture adaptation range, a long capture distance, little impact on the carrier spacecraft, high safety, and low energy consumption.

[0003] In actual use, the method of secondary detonation of a tractor to separate the closing component or the method of driving by a motor is often used to close the net. However, in the secondary detonation technical solution, there are problems such as the mutual restriction of the movement between the closing components and incomplete closing. In addition, the secondary detonation technical solution cannot avoid the problem of the net loosening during the use of the net. The technical solution of motor drive has problems such as complex control scheme and low reliability. Summary of the Invention

[0004] The technical problem solved by the invention is: overcoming the deficiencies of the prior art, providing a passive closing device for a space net, and solving the problems of incomplete closing caused by the mutual restriction between the closing components in the prior art secondary detonation scheme and continuous closing of the net during use, as well as the problems of complex control scheme and low reliability in the motor drive scheme.

[0005] The object of the invention is achieved by the following technical solutions: a passive closing device for a space net, comprising: a housing, a delay ignition device, a cutter, a pulley assembly, a closing rope, a reel-type ejector, and a steel wire rope; wherein, the delay ignition device is arranged at the inner end of the bottom of the housing; the cutter is arranged on top of the delay ignition device; one end of the inner wall of the reel-type ejector is connected to the outer surface of the cutter; the pulley assembly is connected to the top of the cutter and is located inside the reel-type ejector; both ends of the steel wire rope are connected to the top end cover of the reel-type ejector, and the middle part of the steel wire rope passes through a through hole opened in the cutter; one end of the closing rope is connected to the top end cover of the reel-type ejector, and the other end of the closing rope bypasses the pulley assembly and extends out through a second through hole opened in the top end cover of the reel-type ejector.

[0006] In the above-mentioned space net passive closing device, in the initial state, the drum-type ejector is kept in a compressed state by the steel wire rope; when the space net passive closing device is ejected by high-pressure gas, the firing device on the drum-type ejector impacts the delay ignition device, and the delay ignition device is activated. When the preset time of the delay ignition device arrives, the delay ignition device detonates, triggering the cutter, and the cutter cuts the steel wire rope, and the drum-type ejector extends; during the extension of the drum-type ejector, the closing rope is retracted into the interior of the drum-type ejector to achieve closing.

[0007] In the above-mentioned space net passive closing device, the working length of the drum-type ejector is less than its original length, so the drum-type ejector has a pre-tightening force at the working length.

[0008] In the above-mentioned space net passive closing device, the end face of the other end of the drum-type ejector is in the same plane as the upper end face of the housing.

[0009] In the above-mentioned space net passive closing device, the firing device is a percussion cap, a piston with a firing pin or an electric firing device.

[0010] In the above-mentioned space net passive closing device, the pulley assembly includes a pulley, a pulley shaft and a pulley support; wherein, the pulley support is connected to the top of the cutter; the pulley is connected to the pulley support through the pulley shaft.

[0011] In the above-mentioned space net passive closing device, the central axis of the delay ignition device coincides with the central axis of the cutter.

[0012] In the above-mentioned space net passive closing device, the diameter of the steel wire rope should meet the following requirements: Wherein, d is the diameter of the steel wire rope, λ is the safety factor, k is the stiffness of the drum-type ejector, x0 is the original length of the drum-type ejector, x is the length of the drum-type ejector after compression, and σ is the tensile strength of the steel wire rope.

[0013] In the above-mentioned space net passive closing device, the central axis of the drum-type ejector coincides with the central axis of the cutter.

[0014] In the above-mentioned space net passive closing device, the inner wall of one end of the drum-type ejector is adhesively bonded to the outer surface of the cutter, so that the inner cavity of the drum-type ejector has sealing performance, which can ensure the cutting performance and prevent the high-pressure and high-temperature gas from overflowing to damage the closing rope.

[0015] The present invention has the following beneficial effects compared with the prior art:

[0016] (1) The present invention uses a drum - type ejector as the actuator for closing, which completely converts the elastic potential energy of the drum into kinetic energy. And during the entire closing process, the drum - type ejector always has force, without the problem of momentum conservation between each other, so there will be no interference between each closing component;

[0017] (2) The fully - opened distance of the drum - type ejector used in the present invention is greater than the actual required distance. Therefore, during operation, the final length of the drum - type ejector will be less than its original length, having a certain pre - tightening force, which can effectively play a role in preventing loosening;

[0018] (3) The present invention does not involve electronic components and does not require a control circuit board, with a simple structure and higher reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered as limiting the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0020] Figure 1 is the front cross - sectional view of the space net passive closing device provided by the embodiment of the present invention;

[0021] Figure 2 is the side cross - sectional view of the space net passive closing device provided by the embodiment of the present invention;

[0022] Figure 3 is the unfolded front cross - sectional view of the space net passive closing device provided by the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] Hereinafter, the exemplary embodiments of the present disclosure will be described in more detail with reference to the drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. Hereinafter, the present invention will be described in detail with reference to the drawings and in combination with the embodiments.

[0024] Figure 1 is the front cross - sectional view of the space net passive closing device provided by the embodiment of the present invention; Figure 2 is the side cross - sectional view of the space net passive closing device provided by the embodiment of the present invention. As Figure 1 and Figure 2As shown in the figure, the space net passive closing device includes a housing 1, a driving unit, and a wire winding unit. The housing serves to provide an installation space for the driving unit and the wire winding unit.

[0025] The driving unit includes a delay ignition device 2 and a cutter 3; the wire winding unit includes a reel-type ejector 6, a steel wire rope 7, a pulley mechanism 4, and a closing rope 5. The delay ignition device 2 is arranged at the inner end of the bottom of the housing 1; the cutter 3 is arranged on the top of the delay ignition device 2; the inner wall of one end of the reel-type ejector 6 is connected to the outer surface of the cutter 3; the pulley assembly 4 is connected to the top of the cutter 3, and the pulley assembly 4 is located inside the reel-type ejector 6; both ends of the steel wire rope 7 are connected to the top end cover of the reel-type ejector 6, and the middle part of the steel wire rope 7 passes through the through hole opened in the cutter 3; one end of the closing rope 5 is connected to the top end cover of the reel-type ejector 6, and the other end of the closing rope 5 bypasses the pulley assembly 4 and extends out from the second through hole opened in the top end cover of the reel-type ejector 6.

[0026] The pulley assembly 4 includes a pulley, a pulley shaft, and a pulley support; wherein, the pulley support is connected to the top of the cutter 3; the pulley is connected to the pulley support through the pulley shaft.

[0027] The reel-type ejector is in a tensioned state in the initial state and is tensioned by the steel wire rope. When the steel wire rope is cut by the cutter, the reel-type ejector will elongate, but its working length is less than the original length. Therefore, the reel-type ejector will have a certain pre-tightening force at the working elongation length. The entire closing device requires a firing device to provide the initial power and trigger the delay ignition device. The firing device includes, but is not limited to, an ignition cap, a piston with a firing pin, and an electric firing device, etc. The delay ignition device will be fired, and after being fired, it will delay and detonate after a specified time. The cutter has a through hole through which the steel wire rope passes. After the cutter is detonated and fired by the delay ignition device, it will be activated to cut the steel wire rope. The pulley assembly consists of a pulley, a pulley shaft, and a pulley support. The pulley assembly is installed at the top of the cutter. The closing rope passes through the pulley assembly and is fixed to the end cover of the elastic sleeve. The pulley assembly serves to extend the closing distance, making the closing distance twice the elongation distance of the reel-type ejector. Whether to use the pulley assembly can be determined according to the actual use situation.

[0028] In the initial state, the reel-type ejector 6 is kept in a compressed state by being tensioned by the steel wire rope 7; when the space net passive closing device is ejected by high-pressure gas, the firing device on the reel-type ejector 6 impacts the delay ignition device 2, and the delay ignition device 2 is activated. When the preset time of the delay ignition device 2 arrives, the delay ignition device 2 detonates, triggering the cutter 3, and the cutter 3 cuts the steel wire rope 7, and the reel-type ejector 6 elongates; during the elongation process of the reel-type ejector 6, the closing rope 5 is retracted into the inside of the reel-type ejector 6 to achieve closing.

[0029] The working length of the drum-type ejector is less than the original length, so the drum-type ejector 6 will not return to the original length but will maintain the working length. Under this length, it has a certain pre-tightening force, which can prevent the closing from loosening.

[0030] The diameter of the wire rope should meet the following requirements: Among them, d is the diameter of the wire rope, λ is the safety factor, the specific selection is related to the use environment, k is the stiffness of the drum catapult used, x0 is the original length of the drum catapult, x is the length of the drum catapult after compression, that is, the current length in the structure, and σ is the tensile strength of the wire rope; this can enable the wire rope to tighten the drum catapult and maintain sufficient strength without triggering the closing prematurely.

[0031] The inner wall of one end of the drum ejector 6 is glued to the outer surface of the cutter 3, so that the delayed ignition device and the cutter should be sealed to ensure cutting performance while preventing high-pressure and high-temperature gas from overflowing and damaging the closing rope.

[0032] like Figure 3 As shown, the drum-type catapult is conical after being unfolded, and its inner side is bonded to the outer side of the cutter by gluing (other methods are also acceptable). The length after unfolding is 5m, and the closing rope is retracted into the inside of the drum-type catapult by 10m, thus achieving a closing length of 10m.

[0033] The present invention uses a drum-type ejection device as a closing actuator, which completely converts the elastic potential energy of the drum into kinetic energy. In the entire closing process, the drum-type ejection device is always powerful, and there is no problem of conservation of momentum between each other, and no interference between the closing components is caused. The fully opened distance of the drum-type ejection device used in the present invention is greater than the actually required distance, so the final length of the drum-type ejection device during operation will be less than the original length, and it has a certain pre-tightening force, which can effectively prevent loosening. The present invention does not involve electronic components, does not require a control circuit board, has a simple structure, and has higher reliability.

[0034] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A passive closing device for a space rope net, characterized in that Comprising: A housing (1), a delay ignition device (2), a cutter (3), a pulley assembly (4), a closing rope (5), a reel-type ejector (6), and a steel wire rope (7); wherein, The delay ignition device (2) is arranged at the inner end of the bottom of the housing (1); The cutter (3) is arranged on the top of the delay ignition device (2); The inner wall of one end of the reel-type ejector (6) is connected to the outer surface of the cutter (3); The pulley assembly (4) is connected to the top of the cutter (3), and the pulley assembly (4) is located inside the reel-type ejector (6); Both ends of the steel wire rope (7) are connected to the top end cover of the reel-type ejector (6), and the middle of the steel wire rope (7) passes through a through hole opened in the cutter (3); One end of the closing rope (5) is connected to the top end cover of the reel-type ejector (6), and the other end of the closing rope (5) bypasses the pulley assembly (4) and extends out through a second through hole opened in the top end cover of the reel-type ejector (6).

2. The passive closing device for a space rope net according to claim 1, wherein: In the initial state, the reel-type ejector (6) is kept in a compressed state by being tightened by the steel wire rope (7); when the space net passive closing device is ejected by high-pressure gas, the firing device on the reel-type ejector (6) impacts the delay ignition device (2), the delay ignition device (2) is activated, and when the preset time of the delay ignition device (2) arrives, the delay ignition device (2) detonates, triggering the cutter (3), the cutter (3) cuts off the steel wire rope (7), and the reel-type ejector (6) extends; during the extension of the reel-type ejector (6), the closing rope (5) is drawn into the inside of the reel-type ejector (6) to achieve closing.

3. The passive closing device for a space rope net according to claim 2, characterized in that: The working length of the reel-type ejector (6) is less than the original length, so the reel-type ejector (6) has a pre-tightening force at the working length.

4. The passive closing device for a space rope net according to claim 1, characterized in that: The end face of the other end of the reel-type ejector (6) is on the same plane as the upper end face of the housing (1).

5. The passive closing device for a space rope net according to claim 2, characterized in that: The firing device is a percussion cap, a piston with a firing pin, or an electric firing device.

6. The passive closing device for a space rope net according to claim 1, wherein: The pulley assembly (4) includes a pulley, a pulley shaft, and a pulley support; wherein, The pulley support is connected to the top of the cutter (3); The pulley is connected to the pulley support through the pulley shaft.

7. The passive closing device for a space rope net according to claim 1, characterized in that: The central axis of the delay ignition device (2) coincides with the central axis of the cutter (3).

8. The passive closing device for a space rope net according to claim 1, characterized in that: The diameter of the wire rope shall meet the following requirements: Where d is the diameter of the wire rope, λ is the safety factor, k is the stiffness of the drum-type ejector, x0 is the original length of the drum-type ejector, x is the length of the drum-type ejector after compression, and σ is the tensile strength of the wire rope.

9. The passive closing device for a space rope net according to claim 1, characterized in that: The central axis of the reel-type ejector (6) coincides with the central axis of the cutter (3).

10. The passive closing device for a space rope net according to claim 1, characterized in that: The inner wall of one end of the reel-type ejector (6) is adhesively bonded to the outer surface of the cutter (3), so that the inner cavity of the reel-type ejector (6) has sealing performance, ensuring the cutting performance while preventing the high-pressure and high-temperature gas from overflowing and damaging the closing rope.

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