A non-pyrotechnically driven corrosion-resistant detachable hood

Abstract

A corrosion-resistant, detachable hood driven by non-pyrotechnics belongs to the field of aerospace technology. Each two adjacent hoods in the multi-stage hood are detachably connected, and a cutting assembly is provided at the connection between the two hoods located at the bottom, which can cut and separate the multi-stage hood. The multi-stage hood is detachably connected to the upper end of the projectile, and a compressed spring is provided between the multi-stage hood and the projectile. The cutting assembly and the spring elastic force are coupled to cut the multi-stage hood, and the multi-stage hood is separated by spring ejection. The present invention adopts a cutting method under the coupling action of shape memory alloy wire thermal cutting and spring elastic force, as well as a ejection separation method. This non-pyrotechnic separation method has a simple structure, is pollution-free, and is suitable for small aircraft. The separation response is fast, and the hood can be ejected quickly. The multi-stage hood is made of nylon material, which reduces the weight of the hood. Polyaniline graphene oxide is coated on the surface of the multi-stage hood to improve the corrosion resistance of the hood.

Description

Technical Field

[0001] The invention belongs to the field of aerospace technology, and in particular relates to a non-pyrotechnic driven corrosion-resistant detachable hood. Background Art

[0002] Aircraft hoods play an important role in protecting seekers, payloads, or other equipment in storage and launch environments. However, they are susceptible to corrosion and aging under long-term storage conditions, which affects their protective function. In flight environments, the hood needs to be separated from the aircraft in a timely manner. Currently, the main separation methods for hoods are petal separation and integral separation, which are mostly used in large aircraft. Aircraft hoods are often separated by pyrotechnics. However, the gases generated during the working process of pyrotechnics can easily contaminate sensitive optical components, and the complexity of the pyrotechnics driving mechanism makes it difficult to use in micro-aircraft. Therefore, it is necessary to invent a non-pyrotechnic-driven, corrosion-resistant, detachable hood. Summary of the Invention

[0003] In order to solve the problems of traditional protective hoods being separated by pyrotechnics, poor corrosion resistance, large mass, complex design, easy pollution, and unsuitability for small aircraft, the present invention provides a non-pyrotechnic-driven corrosion-resistant detachable hood technology.

[0004] The technical solution adopted by the present invention is:

[0005] A non-pyrotechnically driven, corrosion-resistant, detachable head cover, comprising a cutting assembly, a multi-stage head cover, a spring, a shape memory alloy wire, and a metal plug;

[0006] Each adjacent two-stage head cover in the multi-stage head cover is detachably connected, and the cutting assembly is arranged at the connection between the two lower-most stage head covers, and can cut and separate the multi-stage head covers.

[0007] The multi-stage head cover is detachably connected to the upper end of the projectile, and a compressed spring is provided between the multi-stage head cover and the projectile. The cutting assembly and the spring elastic force are coupled to cut the multi-stage head cover, and the multi-stage head cover is separated by means of spring ejection.

[0008] Compared with the prior art, the present invention has the following beneficial effects:

[0009] 1. The present invention adopts a cutting method of shape memory alloy wire thermal cutting and spring elastic force coupling and a separation method of multi-stage ejection. The present invention has a simple structure, is pollution-free, and is suitable for small aircraft.

[0010] 2. The present invention is provided with a spring, which has a fast separation response and can realize the rapid ejection of the head cover.

[0011] 3. The multi-stage hood of the present invention is made of nylon material, which reduces the weight of the hood.

[0012] 4. The present invention coats polyaniline graphene oxide on the surface of the multi-stage hood, thereby improving the corrosion resistance of the hood. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is the front view of the present invention;

[0014] Figure 2 It is a main sectional view of the present invention;

[0015] Figure 3 is a side sectional view of the present invention;

[0016] Figure 4 This is a schematic diagram of the upper head cover structure of the present invention;

[0017] Figure 5 This is a schematic diagram of the lower head cover structure of the present invention;

[0018] Figure 6 Schematic diagram of the projectile structure of the present invention;

[0019] Among them: 1. Upper head cover; 2. Lower head cover; 3. Spring; 4. Shape memory alloy wire; 5. Bolt; 6. Rubber sealing ring 1; 7. Rubber sealing ring 2; 8. Metal plug; 9. Multi-stage head cover; 10. Projectile; 11. Lug; 12. Fastener. DETAILED DESCRIPTION

[0020] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below with reference to the accompanying drawings.

[0021] like Figures 1 to 3 As shown, the non-pyrotechnic driven corrosion-resistant detachable head cover of the present invention includes a cutting assembly, a multi-stage head cover 9, a spring 3, a shape memory alloy wire 4 and a metal plug 8;

[0022] Each adjacent two-stage head cover in the multi-stage head cover 9 is detachably connected, and the cutting assembly is arranged at the connection between the two lowest-stage head covers, and can cut and separate the multi-stage head cover 9.

[0023] The multi-stage head cover 9 is detachably connected to the upper end of the projectile 10 by bolts, screws and other connecting parts, and a compressed spring 3 is provided between the multi-stage head cover 9 and the projectile 10. The cutting assembly and the spring 3 are elastically coupled to cut the multi-stage head cover 9, and the multi-stage head cover 9 is ejected and separated with the help of the spring 3.

[0024] Specifically:

[0025] like Figure 2 、 Figure 3 As shown, one end of the spring 3 abuts against the projectile body 10 , and the other end of the spring 3 abuts against the first-stage head cover closest to the projectile body 10 in the multi-stage head cover 9 .

[0026] like Figure 2 、 Figure 3 As shown, two adjacent head covers of the multi-stage head cover 9 are integrally provided with two lugs 11 at the joints of each two adjacent head covers, and the two adjacent pairs of lugs 11 are fixed by bolts 5 to connect each two adjacent head covers.

[0027] like Figure 2 、 Figure 3 As shown, the cutting assembly includes two shape memory alloy wires 4 and two metal plugs 8; the two shape memory alloy wires 4 pass through the bottom of a pair of lugs 11 respectively, and the two ends of the two shape memory alloy wires 4 are connected to a metal plug 8, and the two ends of the shape memory alloy wires 4 on the same side share a metal plug 8, and the two metal plugs 8 pass through the through holes provided in the body 10 and are connected to the power supply in the body 10 in the form of plug-ins.

[0028] like Figure 2 、 Figure 3 As shown, the shape memory alloy wire 4 is initially in a pre-stretched state. When the shape memory alloy wire 4 is energized and heated, the lug 11 is softened by the heat and cut off under the strong contraction force of the shape memory alloy wire 4.

[0029] like Figure 2 、 Figure 3 As shown, four fasteners 12 are provided above the inner wall of the multi-stage head cover 9 , and every two fasteners 12 are used to fix one shape memory alloy wire 4 , which can constrain the shape memory alloy wire 4 .

[0030] The fastener 12 may be a screw with a perforation, and the shape memory alloy wire 4 is passed through the screw to fix the shape memory alloy wire 4 .

[0031] The multi-stage head cover 9 is made of a high-strength, high-melting-point polymer material, such as nylon material, epoxy resin, bismaleimide resin, etc., and the outer surface is coated with polyaniline graphene oxide to increase the corrosion resistance of the multi-stage head cover 9.

[0032] Each adjacent two stage head covers in the multi-stage head cover 9 are sealed by a rubber sealing ring 6.

[0033] The multi-stage head cover 9 and the projectile body 10 are sealed by a rubber sealing ring 7.

[0034] The multi-stage hood 9 is a multi-stage hood with two or more levels.

[0035] The present invention is specifically described by taking the second-level head cover as an example.

[0036] The upper hood 1 is made of a high-strength, high-melting-point polymer material, such as nylon, epoxy resin, or bismaleimide resin. The outer surface is coated with polyaniline graphene oxide to enhance the corrosion resistance of the upper hood 1. Two horizontal lugs 11 are located on opposite sides of the inner wall to facilitate connection between the upper and lower hoods.

[0037] The lower hood 2 is made of a high-strength, high-melting-point polymer material, such as nylon, epoxy resin, or bismaleimide resin. The outer surface is coated with polyaniline graphene oxide to increase the corrosion resistance of the lower hood 2. Two horizontal lugs 11 are located on opposite sides of the inner wall to facilitate connection between the upper and lower hoods.

[0038] The insulating spring 3 is a compression spring with an insulating coating on the outside;

[0039] The initial state of the shape memory alloy wire 4 is a pre-stretched state;

[0040] The bolt 5 is a standard part;

[0041] The rubber sealing ring 6 is a standard part;

[0042] The rubber sealing ring 2 7 is a standard part;

[0043] The metal plug 8 is a copper plug;

[0044] The head cover is separated in the following manner: the upper head cover 1 is ejected by the spring 3 and separated from the lower head cover 2.

[0045] The outer surface of the upper head cover 1 and the lower head cover 2 is coated with polyaniline graphene oxide to increase the corrosion resistance of the head cover. The shape memory alloy wire 4 is pre-stretched and fixed to the lug 11, and its two ends are connected to the metal plug 8. The metal plug 8 is connected to the power supply in the form of a plug-in. A spring 3 is placed in the upper head cover 1. When the upper and lower head covers are connected to the projectile 10, the spring 3 is in a compressed state. The upper and lower head covers and the head cover and the projectile 10 are connected with bolts 5. In order to ensure the sealing of the head cover, a rubber sealing ring 6 is placed at the connection between the upper and lower head covers. A rubber sealing ring 7 is placed at the connection between the cover 2 and the elastic body 10. When power is applied to both ends of the electrode, the temperature of the shape memory alloy wire 4 rises due to the thermal effect of the current, and a contraction force is generated when the shape is restored. The lug 11 is softened by the heat and is cut off under the strong contraction force of the shape memory alloy wire 4. At this time, the spring 3 elastically recovers, causing the upper head cover 1 and the lower head cover 2 to separate and bounce off without restraint. Since the shape memory alloy wire 4 is connected to the electrode through a metal plug 8, the metal plug 8 is detached from the plug-in electrode and separated from the upper head cover during the process of the upper head cover 1 bouncing off.

[0046] It will be understood that the present invention is described by way of some embodiments, and it will be appreciated by those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are intended to be protected by the present invention.

Claims

1. A non-pyrotechnically driven, corrosion-resistant, detachable hood, characterized by: It comprises a cutting assembly, a multi-stage head cover (9), a spring (3), a shape memory alloy wire (4) and a metal plug (8); Each adjacent two-stage head cover in the multi-stage head cover (9) are detachably connected, and the cutting assembly is arranged at the connection between the two lower-most stage head covers, and is capable of cutting and separating the multi-stage head cover (9). The multi-stage head cover (9) is detachably connected to the upper end of the projectile (10), and a spring (3) in a compressed state is provided between the multi-stage head cover (9) and the projectile (10). The cutting assembly and the spring (3) are elastically coupled to cut the multi-stage head cover (9), and the multi-stage head cover (9) is ejected and separated by the spring (3). One end of the spring (3) abuts against the elastic body (10), and the other end of the spring (3) abuts against the upper head cover of the multi-stage head cover (9). The multi-stage head cover (9) is provided with two lugs (11) at the joint of each two adjacent head covers, and the two adjacent pairs of lugs (11) are fixed by bolts (5) to connect each two adjacent head covers. The cutting assembly comprises two shape memory alloy wires (4) and two metal plugs (8); the two shape memory alloy wires (4) are initially in a pre-stretched state, the two shape memory alloy wires (4) respectively pass through the bottom of a pair of lugs (11), the two ends of the two shape memory alloy wires (4) are connected to a metal plug (8), and the two ends of the two shape memory alloy wires (4) located on the same side share a metal plug (8), the two metal plugs (8) pass through the through hole provided in the body (10), and are connected to the power supply in the body (10) in the form of plug-ins, the shape memory alloy wires (4) are energized and heated, the lugs (11) are softened by the heat, and are cut off under the strong contraction force of the shape memory alloy wires (4). Four fasteners (12) are provided above the inner wall of the multi-stage head cover (9), and every two fasteners (12) are used to fix one shape memory alloy wire (4), and can constrain the shape memory alloy wire (4).

2. The non-pyrotechnically driven, corrosion-resistant, detachable hood according to claim 1, characterized in that: The multi-stage head cover (9) is made of a high-strength, high-melting-point polymer material.

3. The non-pyrotechnically driven, corrosion-resistant, detachable hood according to claim 2, characterized in that: The outer surface of the multi-stage head cover (9) is coated with polyaniline graphene oxide to increase the corrosion resistance of the multi-stage head cover (9).

4. The non-pyrotechnically driven, corrosion-resistant, detachable hood according to claim 1, characterized in that: The spring (3) is a compression spring, and an insulating coating is applied to the outside.

5. The non-pyrotechnically driven, corrosion-resistant, detachable hood according to claim 1, characterized in that: Each adjacent two stage head covers in the multi-stage head cover (9) are sealed by a rubber sealing ring (6).

6. The non-pyrotechnically driven, corrosion-resistant, detachable hood according to claim 1, characterized in that: The multi-stage head cover (9) and the elastic body (10) are sealed by a second rubber sealing ring (7).

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