Impact reduction protection structure for space camera explosive bolt unlocking device

Abstract

The invention relates to an impact reduction protection structure for a space camera explosive bolt unlocking device, belongs to the technical field of space optical remote sensing, and solves the problem that an existing space camera explosive bolt unlocking device cannot give consideration to impact load, explosive bolt unlocking reliability and overall dynamic rigidity of a space camera. The structure mainly comprises an explosive bolt force transmission path passive control assembly, an adjustable elastic impact reduction assembly and a medium-high frequency impact response attenuation assembly. The explosive bolt top end protection cover and the explosive bolt tail end protection cover are arranged on the explosive bolt in a sleeving mode, and the high-K-value laminated spring arranged in the explosive bolt top end protection cover and the medium-high frequency impact response attenuation assembly arranged on the top of the explosive bolt top end protection cover are combined, so that energy generated when the explosive bolt is unlocked can be effectively absorbed; the influence of medium-high frequency impact response generated when the explosive bolt is separated on the space camera is reduced, meanwhile, the unlocking reliability of the explosive bolt and the dynamic rigidity of the space camera are guaranteed, and the applicability is high.

Description

Technical Field

[0001] The invention belongs to the technical field of space optical remote sensing, and in particular relates to an impact reduction protection structure for an explosive bolt unlocker of a space camera. Background Art

[0002] With the increasing application of my country's space optical remote sensing imaging technology in the military and civilian fields, various key technologies based on space cameras are developing rapidly. For space cameras, they need to experience a variety of environmental conditions during ground environmental tests and space use, such as shock, vibration, microgravity, heat, vacuum, various radiation and electromagnetic, etc., especially for long focal length, high resolution, and ultra-large field of view cameras, which not only need to meet the laboratory imaging quality of the camera, but also have high structural stability to provide a strong guarantee for the stability of the camera's optical system. Special attention should be paid to the camera's support structure. The constraints of the six degrees of freedom should be both solid and not over-positioned. At the same time, the connection between the camera and the satellite platform should also avoid over-constraint. In other words, the support structure should provide sufficiently high rigidity during ground testing and transportation, and at the same time, the camera should be fully constrained in the on-orbit state, providing a certain degree of flexibility to filter out external adverse disturbances. At present, in order to solve the rigidity and flexibility problems of the camera support structure, the unlocker locking solution is generally adopted to ensure the overall rigidity of the space camera. After entering orbit, the unlocker is unlocked and separated, leaving only the flexible part of the structure to resist the influence of external disturbances on the camera's optical system. Since pyrotechnics have the advantages of high reliability and simple assembly process, explosive bolts are generally regarded as the best choice for unlocking devices.

[0003] The explosive bolt achieves structural separation by triggering the ignition of gunpowder, and has the characteristics of high energy density. Therefore, the impact load generated on the optics and high-precision loads near the unlocker is also very huge. At present, the impact response is generally reduced by reducing the explosive bolt filling amount and reducing the bolt preload, but it will also reduce the reliability of the explosive bolt unlocking and the overall dynamic stiffness of the space camera. Therefore, it is necessary to design an impact reduction protection structure for the explosive bolt unlocker of the space camera, which can reduce the adverse effects of the impact load on the space camera while ensuring the unlocking reliability and the dynamic stiffness of the camera. Summary of the invention

[0004] In order to solve the problem that the existing explosive bolt unlocker of a space camera cannot reduce the adverse effects of impact loads on the space camera while ensuring the explosive bolt unlocking reliability and the overall dynamic stiffness of the space camera, the present invention provides an impact reduction protection structure for an explosive bolt unlocker of a space camera.

[0005] A shock reduction protection structure for an explosive bolt unlocker of a space camera, comprising an explosive bolt force transmission path passive control component, an adjustable elastic shock reduction component and a medium and high frequency shock response attenuation component, wherein the explosive bolt force transmission path passive control component comprises an explosive bolt top protection cover, an explosive bolt tail protection cover, an aluminum honeycomb energy absorbing gasket, a polyimide vibration isolation pad, a silicone rubber shock absorbing pad, a camera support structure and a gasket, the adjustable elastic shock reduction component comprises a contact base, a high K value stack spring and an adjustment base, and the medium and high frequency shock response attenuation component comprises a particle shock absorber and a particle shock absorber cover plate;

[0006] The explosive bolt, the top protective cover of the explosive bolt and the rear protective cover of the explosive bolt are connected to the camera support structure through titanium alloy screws, the gasket is located between the top protective cover of the explosive bolt and the rear protective cover of the explosive bolt, the top protective cover of the explosive bolt and the rear protective cover of the explosive bolt are sleeved on the explosive bolt, the polyimide vibration isolation pad is placed inside the camera support structure, and is clamped by the pre-tightening force between the explosive bolt and the camera support structure, the silicone rubber shock-absorbing pad is placed at the tail of the rear protective cover of the explosive bolt, and the aluminum honeycomb energy-absorbing gasket is placed in the gap between the explosive bolt and the camera support structure;

[0007] The contact base is placed inside the top protective cover of the explosive bolt, the adjustment base is connected to the top of the top protective cover of the explosive bolt through a fine thread, a high K value stacked spring is placed between the contact base and the adjustment base, and the contact base is butted against the nut end of the explosive bolt;

[0008] The bottom of the particle damper is connected to the top of the protective cover at the top of the explosive bolt through a titanium alloy screw, the particle damper cover plate covers the cavity opening of the particle damper and is connected through a titanium alloy screw, and the cavity of the particle damper is filled with a plurality of steel balls that have been annealed, heat treated and sandblasted;

[0009] When the explosive bolt separates, it breaks into two parts along the polyimide vibration isolation pad. One part crushes the aluminum honeycomb energy-absorbing gasket to consume part of the energy, and then compresses the adjustable elastic impact-reducing component. The adjustable elastic impact-reducing component absorbs energy through high-K value stacked spring compression. The residual energy after attenuation by the adjustable elastic impact-reducing component is transferred to the medium and high frequency impact response attenuation component, and the steel balls in the particle shock absorber collide and rub against each other to consume energy. The other part hits the silicone rubber shock-absorbing pad, and the residual energy is attenuated by the protective cover at the tail end of the explosive bolt and then transferred to the camera support structure.

[0010] Beneficial effects of the present invention: The impact reduction protection structure for the explosive bolt unlocker of a space camera proposed in the present invention can effectively absorb the energy generated when the explosive bolt is unlocked, and reduce the influence of the medium and high frequency impact response generated when the explosive bolt is separated on the space camera, by sleeved on the explosive bolt top protection cover and the explosive bolt tail protection cover, and combined with the high K value stack spring arranged in the top protection cover of the explosive bolt and the medium and high frequency impact response attenuation component arranged on the top of the top protection cover of the explosive bolt. It retains the existing explosive bolt unlocking scheme while ensuring the reliability of the explosive bolt unlocking and the dynamic stiffness of the space camera, can effectively reduce the medium and high frequency impact response, is more conducive to the dynamic stability of the space camera during ground testing and transportation and the imaging quality in the on-orbit state, and does not require major modifications to the existing space camera support structure, and has strong applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without exceeding the scope of protection required by the present invention.

[0012] Figure 1 This is a structural schematic diagram of an impact reduction protection structure for an explosive bolt unlocker for a space camera according to an embodiment of the present invention;

[0013] Figure 2 for Figure 1 An exploded view of the impact protection structure shown;

[0014] Figure 3 It is a structural schematic diagram of the passive control component of the explosive bolt force transmission path;

[0015] Figure 4 It is a structural schematic diagram of an adjustable elastic impact reduction component;

[0016] Figure 5 Schematic diagram of the structure of the mid-to-high frequency impulse response attenuation component.

[0017] Explanation of the reference numerals in the accompanying drawings: 1. Passive control component of the force transmission path of the explosive bolt; 1-1. Explosive bolt; 1-2. Protective cover on the top end of the explosive bolt; 1-3. Protective cover on the tail end of the explosive bolt; 1-4. Aluminum honeycomb energy-absorbing gasket; 1-5. Polyimide vibration isolation pad; 1-6. Silicone rubber shock-absorbing pad; 1-7. Camera support structure; 1-8. Gasket; 2. Adjustable elastic impact reduction component; 2-1. Contact base; 2-2. High-K value stacked spring; 2-3. Adjustment base; 3. Medium and high frequency impact response attenuation component; 3-1. Particle shock absorber; 3-2. Particle shock absorber cover. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0019] See also Figure 1-Figure 5 , this embodiment provides a structure of an impact reduction protection structure for an explosive bolt unlocker of a space camera, and the impact reduction protection structure mainly includes three components, namely, an explosive bolt force transmission path passive control component 1, an adjustable elastic impact reduction component 2, and a medium and high frequency impact response attenuation component 3. Among them, the explosive bolt force transmission path passive control component 1 includes: an explosive bolt top protection cover 1-2, an explosive bolt tail protection cover 1-3, an aluminum honeycomb energy absorption gasket 1-4, a polyimide vibration isolation pad 1-5, a silicone rubber shock absorption pad 1-6, a camera support structure 1-7 and a gasket 1-8. The adjustable elastic impact reduction component 2 includes: a contact base 2-1, a high K value stack spring 2-2 and an adjustment base 2-3. The medium and high frequency impact response attenuation component 3 includes: a particle shock absorber 3-1 and a particle shock absorber cover plate 3-2.

[0020] Specifically, the explosive bolt 1-1, the top protective cover 1-2 of the explosive bolt, and the rear protective cover 1-3 of the explosive bolt are connected to the camera support structure 1-7 by titanium alloy screws, and a gasket 1-8 is provided at a fixed position between the top protective cover 1-2 of the explosive bolt and the rear protective cover 1-3 of the explosive bolt, and the top protective cover 1-2 of the explosive bolt and the rear protective cover 1-3 of the explosive bolt are sleeved on the explosive bolt 1-1. The polyimide vibration isolation pad 1-5 is placed inside the camera support structure 1-7, and the polyimide vibration isolation pad 1-5 is clamped by the pre-tightening force between the explosive bolt 1-1 and the camera support structure 1-7. The silicone rubber shock-absorbing pad 1-6 is placed at the tail of the rear protective cover 1-3 of the explosive bolt, and is not fixed. The aluminum honeycomb energy-absorbing gasket 1-4 is placed in the gap between the explosive bolt 1-1 and the camera support structure 1-7, and is also not fixed.

[0021] The contact base 2-1 is placed inside the top protective cover 1-2 of the explosive bolt through a small gap, the adjustment base 2-3 is connected to the top of the top protective cover 1-2 of the explosive bolt through a fine thread, and the high K value stacked spring 2-2 is placed between the contact base 2-1 and the adjustment base 2-3, and is not fixed. A protrusion is provided on one side of the contact base 2-1, which is embedded in one end of the high K value stacked spring 2-2, and the other side is against the nut end of the explosive bolt 1-1. Before the explosive bolt 1-1 is triggered, the compression amount of the high K value stacked spring 2-2 is adjusted by tightening or loosening the adjustment base 2-3, thereby adjusting the elastic modulus of the high K value stacked spring 2-2, so that the high K value stacked spring 2-2 is in a compressed state. Among them, the K value range of the high K value stacked spring 2-2 can be 10000N / mm~15000N / mm.

[0022] The bottom of the particle shock absorber 3-1 is connected to the top of the protective cover 1-2 at the top of the explosive bolt through a titanium alloy screw, the particle shock absorber cover 3-2 covers the cavity opening of the particle shock absorber 3-1, and the particle shock absorber 3-1 and the particle shock absorber cover 3-2 are connected through titanium alloy screws. The cavity of the particle shock absorber 3-1 is filled with a number of steel balls that have been annealed, heat treated and sandblasted, and the steel ball filling rate is 85%.

[0023] When the explosive bolt 1-1 is separated, the explosive bolt 1-1 is broken into two parts along the polyimide vibration isolation pad 1-5. One part of the explosive bolt crushes the aluminum honeycomb energy absorbing pad 1-4 and consumes part of the energy, and then compresses the adjustable elastic shock-absorbing component 2. The adjustable elastic shock-absorbing component 2 absorbs energy through its own high-K value stack spring 2-2. The residual energy after attenuation by the adjustable elastic shock-absorbing component 2 is transferred to the particle shock absorber 3-1 in the medium and high frequency impact response attenuation component 3. The steel balls built in the particle shock absorber 3-1 collide and rub against each other, consuming energy, thereby reducing the medium and high frequency impact response in the structure. The other part hits the silicone rubber shock-absorbing pad 1-6, and the residual energy is attenuated by the explosive bolt tail end protective cover 1-3 and then transferred to the camera support structure 1-7.

[0024] Optionally, the explosive bolt tail end protection cover 1-3 in this embodiment includes two bodies with identical structures and interlocking with each other, such as Figure 2 As shown, the two bodies are fixed by titanium alloy screws, so as to facilitate installation.

[0025] The impact reduction protection structure for the explosive bolt unlocker of a space camera proposed in the present invention can effectively absorb the energy generated when the explosive bolt is unlocked, and reduce the influence of the medium and high frequency impact response generated when the explosive bolt is separated on the space camera, by sleeved on the explosive bolt top protection cover and the explosive bolt tail protection cover, and combining the high K value stack spring arranged in the explosive bolt top protection cover and the medium and high frequency impact response attenuation component arranged on the top of the explosive bolt top protection cover. It can retain the existing explosive bolt unlocking scheme while ensuring the reliability of the explosive bolt unlocking and the dynamic stiffness of the space camera, can effectively reduce the medium and high frequency impact response, and is more conducive to the dynamic stability of the space camera during ground testing and transportation and the imaging quality in the on-orbit state, and does not require major modifications to the existing space camera support structure, and has strong applicability.

[0026] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0027] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A shock-reducing protective structure for an explosive bolt unlocker of a space camera, characterized in that: The invention comprises a passive control component (1) for the force transmission path of an explosive bolt, an adjustable elastic shock absorbing component (2) and a medium-high frequency shock response attenuation component (3), wherein the passive control component (1) for the force transmission path of an explosive bolt comprises a top protective cover (1-2) for an explosive bolt, a rear protective cover (1-3) for an explosive bolt, an aluminum honeycomb energy absorbing gasket (1-4), a polyimide vibration isolation pad (1-5), a silicone rubber shock absorbing pad (1-6), a camera support structure (1-7) and a gasket (1-8), the adjustable elastic shock absorbing component (2) comprises a contact base (2-1), a high K value stacked spring (2-2) and an adjustment base (2-3), and the medium-high frequency shock response attenuation component (3) comprises a particle shock absorber (3-1) and a particle shock absorber cover plate (3-2); The explosive bolt (1-1), the explosive bolt top protective cover (1-2) and the explosive bolt tail protective cover (1-3) are connected to the camera support structure (1-7) through titanium alloy screws, the gasket (1-8) is located between the explosive bolt top protective cover (1-2) and the explosive bolt tail protective cover (1-3), the explosive bolt top protective cover (1-2) and the explosive bolt tail protective cover (1-3) are sleeved on the explosive bolt (1-1), the polyimide vibration isolation pad (1-5) is placed inside the camera support structure (1-7) and is clamped by the pre-tightening force between the explosive bolt (1-1) and the camera support structure (1-7), the silicone rubber shock-absorbing pad (1-6) is placed at the tail of the explosive bolt tail protective cover (1-3), and the aluminum honeycomb energy-absorbing pad (1-4) is placed in the gap between the explosive bolt (1-1) and the camera support structure (1-7); The contact base (2-1) is placed inside the top protective cover (1-2) of the explosive bolt, the adjustment base (2-3) is connected to the top of the top protective cover (1-2) of the explosive bolt through a fine thread, the high K value stacked spring (2-2) is placed between the contact base (2-1) and the adjustment base (2-3), and the contact base (2-1) abuts against the nut end of the explosive bolt (1-1); The bottom of the particle damper (3-1) is connected to the top of the protective cover (1-2) at the top of the explosive bolt through a titanium alloy screw, the particle damper cover plate (3-2) covers the cavity opening of the particle damper (3-1) and is connected through the titanium alloy screw, and the cavity of the particle damper (3-1) is filled with a plurality of steel balls that have been annealed, heat treated and sandblasted; When the explosive bolt (1-1) is separated, the explosive bolt (1-1) is broken into two parts along the polyimide vibration isolation pad (1-5), one part of which crushes the aluminum honeycomb energy absorption pad (1-4) to consume part of the energy, and then compresses the adjustable elastic shock absorption component (2). The adjustable elastic shock absorption component (2) absorbs energy through compression through the high-K value stack spring (2-2), and the residual energy after attenuation by the adjustable elastic shock absorption component (2) is transferred to the medium and high frequency impact response attenuation component (3), and the steel balls in the particle shock absorber (3-1) collide and rub against each other to consume energy; the other part hits the silicone rubber shock absorption pad (1-6), and the residual energy is attenuated by the explosive bolt tail end protective cover (1-3) and then transferred to the camera support structure (1-7).

2. The impact reduction protection structure for the explosive bolt unlocker of a space camera according to claim 1, characterized in that: The explosive bolt tail end protective cover (1-3) comprises two bodies with the same structure and interlocked with each other, and the two bodies are fixed by titanium alloy screws.

3. The impact reduction protection structure for the explosive bolt unlocker of a space camera according to claim 1, characterized in that: The filling rate of steel balls inside the particle damper (3-1) is 85%.

4. The impact reduction protection structure for the explosive bolt unlocker of a space camera according to claim 1, characterized in that: The K value range of the high K value stack spring (2-2) is 10000N / mm to 15000N / mm.

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