Solid booster main binding point cutting device

Abstract

The solid rocket booster main binding point cutting device of the present invention includes a nut plug, a protective cover, and a pyrotechnic element. The nut plug includes a cylindrical section and an annular section connected to each other. A weakening groove is provided on the inner wall of the cylindrical section. The inner wall of the protective cover is designed as a step. The protective cover is fitted onto the nut plug and is connected to the nut plug with a left-hand thread. The stepped end face of the protective cover is completely fitted with the nut plug to form a sealed cavity. The pyrotechnic element is disposed in the sealed cavity. Multiple first notches are provided on the outer ring of the protective cover, near the core stage side mechanism of the main binding mechanism, for use as loading and anti-loosening latches. The solid rocket booster main binding point cutting device of the present invention has few parts, occupies little space, is suitable for the main binding point of a new generation of solid rocket boosters, and has high reliability.

Description

Technical Field

[0001] This invention relates to the field of aerospace technology, specifically to a solid rocket booster main binding point cutting device. Background Technology

[0002] Figure 1 The image shown is a cross-sectional view of a prior art booster main binding point cutting device. Figure 2 The diagram shows a breakdown view of the installation and operation of a prior art booster main lashing point cutting device and a typical main lashing mechanism. (See attached diagram.) Figure 1 and Figure 2 The existing booster main binding point cutting device includes a nut plug 1', a protective cover 2', a pyrotechnic element 3', a collecting spring 4', a locking nut 5', and a screw 6'. The inner wall of the nut plug 1' is threadedly connected to the core stage side structure 10 of the main binding mechanism. The protective cover 2' is loosely fitted on the nut plug 1'. The inner wall of the protective cover 2' is provided with a pyrotechnic element mounting groove, which forms a sealed cavity with the outer wall of the nut plug 1'. The pyrotechnic element 3' is set in this sealed cavity. The locking nut 5' is threadedly connected to the outer wall of the nut plug 1'. The L-shaped collecting spring 4' is clamped in the protective cover 2' and the locking nut 5', and is connected to the locking nut 5' by the screw 6'. A locking component 7' is also provided between the locking nut 5' and the core stage side structure 10 of the main binding mechanism. Figure 2 101' and 102' are the left and right sections of the nut plug separation surface, respectively.

[0003] The main binding point of the new generation of solid rocket boosters in China is the sealed steel casing connecting the booster side to the solid rocket motor. This casing cannot utilize its internal space for a cutting device design, resulting in limited design space for the main binding point cutting device. Existing booster main binding point cutting devices have numerous components, each with a single function, occupying a large radial space and being quite thick overall, making them unsuitable for the design of the new generation of solid rocket booster main binding point cutting devices. The protective cover is loosely fitted onto the nut plug without any securing measures. To prevent it from becoming waste after separation, an L-shaped collection spring is required to achieve collection under severe cutting impact. The design and analysis of the collection spring are quite difficult, relying on multiple firing tests and iterative verification of the design, resulting in high cost, long cycle time, and low collection reliability. Summary of the Invention

[0004] The purpose of this invention is to provide a solid rocket booster main tie-down point cutting device with fewer parts, smaller footprint, suitable for the main tie-down point of next-generation solid rocket boosters, and with high reliability.

[0005] To achieve the above objectives, the present invention provides a main binding point cutting device for a solid rocket booster, comprising a nut plug, a protective cover, and a pyrotechnic element; the nut plug comprises a cylindrical segment and an annular segment connected to each other; a weakening groove is provided on the inner wall of the cylindrical segment; the inner wall of the protective cover is designed as a step; the protective cover is fitted onto the nut plug and is connected to the nut plug by a left-hand thread, and the stepped end face of the protective cover is completely fitted with the nut plug to form a sealed cavity, and the pyrotechnic element is disposed in the sealed cavity; a plurality of first notches are provided on the outer ring of the protective cover, near the core stage side mechanism of the main binding mechanism, for use as loading and anti-loosening latches.

[0006] The aforementioned solid rocket booster main binding point cutting device includes a left-hand thread on the outer wall of the cylindrical section and a left-hand thread on the inner wall of the protective cover, which connects the nut plug to the protective cover; a right-hand thread is also provided on the inner wall of the cylindrical section for connection with the core-stage side mechanism of the main binding mechanism; the two threads on the inner and outer walls of the cylindrical section have the same pitch.

[0007] The aforementioned solid rocket booster main binding point cutting device has a plurality of second notches on the outer ring of the annular segment, away from the cylindrical segment, and the size of the second notches in the axial direction is smaller than the size of the annular segment in the axial direction.

[0008] The aforementioned solid booster main binding point cutting device includes an anti-loosening component for connecting and fixing the core stage side of the main binding mechanism to the protective cover.

[0009] The aforementioned solid rocket booster main binding point cutting device, wherein the inner ring of the annular segment cooperates with the booster side mechanism of the main binding mechanism and is locked at its upper structural limit position.

[0010] The aforementioned solid rocket booster main binding point cutting device, during separation, the pyrotechnic element cuts a weakening groove, dividing the nut plug into a left section and a right section of the nut plug separation surface; after separation, the protective cover and the left section of the nut plug separation surface are fixed to the core stage side of the main binding mechanism by threads, and the right section of the nut plug separation surface is limited on the booster side mechanism of the main binding mechanism, so as to effectively collect the residue of each component of the cutting device without generating excess material.

[0011] Compared with the prior art, the beneficial technical effects of the present invention are:

[0012] 1) This invention simplifies the design of the cutting device, reducing the number of parts from 6 in the traditional design to 3;

[0013] 2) The solid rocket booster main binding point cutting device of the present invention adopts a stepped notch and left-hand thread design for the protective cover, which makes full use of the existing structure of the nut plug, takes into account the functions of anti-loosening, collection and forming a sealed cavity for the propellant, eliminates the design of the anti-loosening nut, and greatly reduces the thickness of the cutting device, which is suitable for the narrow space requirements of the main binding point design of the new generation of solid rocket boosters.

[0014] 3. The solid booster main binding point cutting device of the present invention collects the protective cover through a large thread with high load-bearing capacity after separation, making the collection scheme more reliable. Attached Figure Description

[0015] The solid rocket booster main binding point cutting device of the present invention is given by the following embodiments and figures.

[0016] Figure 1 A cross-sectional view of the existing technology's booster main binding point cutting device.

[0017] Figure 2 This is an anatomical view showing the installation and operation of a booster main binding point cutting device and a typical main binding mechanism in the prior art.

[0018] Figure 3 This is a cross-sectional view of the main binding point cutting device for a solid rocket booster according to a preferred embodiment of the present invention.

[0019] Figure 4 The following is a sectional view showing the installation and operation of the solid rocket booster main binding point cutting device and typical main binding mechanism according to a preferred embodiment of the present invention. Detailed Implementation

[0020] The following will combine Figures 1-4 The solid rocket booster main binding point cutting device of the present invention will be described in further detail.

[0021] Figure 3 The figure shown is a cross-sectional view of the solid rocket booster main binding point cutting device according to a preferred embodiment of the present invention. Figure 4 The diagram shows the installation and working sectional view of the solid rocket booster main binding point cutting device and typical main binding mechanism according to a preferred embodiment of the present invention, wherein (a) is the installation sectional view and (b) is the working sectional view.

[0022] like Figure 3 and Figure 4 As shown, the solid rocket booster main binding point cutting device of this embodiment includes a nut plug 1, a protective cover 2, and a pyrotechnic element 3;

[0023] The nut plug 1 includes a cylindrical section 11 and an annular section 12 connected to each other; the inner wall of the cylindrical section 11 is provided with a weakening groove 13, which is a separation surface; the inner wall of the cylindrical section 11 is also provided with a right-hand thread for connecting with the core stage side mechanism 10 of the main binding mechanism and bearing the radial load applied by the booster; the inner wall with the weakening groove 13 is close to the annular section 12; the outer wall of the cylindrical section 11 is provided with a left-hand thread for connecting with the protective cover 2; the pitch of the two threads is... Similar to the cylindrical section, both have a large load-bearing capacity and strong ability to collect and limit the protective cover after separation; multiple notches 14 are provided on the outer ring of the annular section 12, away from the cylindrical section. The notches 14 do not penetrate the entire thickness of the annular section 12, that is, the size of the notches 14 in the axial direction is smaller than the size of the annular section 12 in the axial direction, ensuring the integrity of the end face of the annular section 12 near the cylindrical section; the inner ring of the annular section 12 cooperates with the main binding mechanism's booster side mechanism 20 and is locked at its structural upper limit;

[0024] The inner wall of the protective cover 2 is designed in a stepped shape; the inner wall of the protective cover 2 is provided with a left-hand thread, which is the same as the left-hand thread on the outer wall of the nut plug 1; the protective cover 2 is fitted onto the nut plug 1 and connected to the nut plug 1 with a left-hand thread, and the stepped end face of the protective cover 2 is completely fitted with the nut plug 1 to form a sealed cavity, the pyrotechnic element 3 is disposed in the sealed cavity, and the pyrotechnic element 3 is located above the weakening groove 13 of the nut plug 1; multiple notches 21 are provided on the outer ring of the protective cover 2, near the core side mechanism 10 of the main binding mechanism, for use as loading and anti-loosening latches;

[0025] The pyrotechnic element 3 is a linear cutting pyrotechnic element used to cut the weakening groove of the nut plug 1, dividing the nut plug 1 into a left section 101 of the nut plug separation surface and a right section 102 of the nut plug separation surface, thereby unlocking the cutting device.

[0026] In this embodiment, the solid booster main binding point cutting device is assembled on the main binding mechanism. It can be connected and fixed to the core stage side portion 10 of the main binding mechanism and the protective cover 2 through the anti-loosening component 7. Since the protective cover 2 is connected to the nut plug 1 with a left-hand thread and the nut plug 1 is connected to the core stage side portion 10 of the main binding mechanism with a right-hand thread, the nut plug 1 is completely fixed after the protective cover 2 is fixed, realizing the anti-loosening function of the entire cutting device. This anti-loosening function can be maintained in both the assembled state and the disassembled state.

[0027] The solid booster main binding point cutting device in this embodiment has a total thickness of 35mm, while the thickness of existing booster main binding point cutting devices is generally greater than 50mm, saving considerable thickness space and providing more space for the design of the main binding mechanism.

[0028] Those skilled in the art will understand that the present invention can be implemented in many other specific forms without departing from its spirit or scope. Although embodiments of the invention have been described, it should be understood that the invention is not limited to these embodiments, and those skilled in the art can make changes and modifications within the spirit and scope of the invention as defined in the appended claims.

Claims

1. A solid rocket booster main binding point cutting device, characterized in that, This includes nuts, plugs, covers, and pyrotechnic components; The nut plug includes a cylindrical section and an annular section connected to each other; the inner wall of the cylindrical section is provided with a weakening groove; The inner wall of the protective cover is designed in a stepped shape; the protective cover is fitted onto the nut plug and is connected to the nut plug with a left-hand thread, and the stepped end face of the protective cover is completely fitted with the nut plug to form a sealed cavity, and the pyrotechnic element is placed in the sealed cavity; Multiple first notches are provided on the outer ring of the protective cover, near the core side mechanism of the main binding mechanism, to serve as loading and anti-loosening latches.

2. The solid rocket booster main binding point cutting device as described in claim 1, characterized in that, The outer wall of the cylindrical section is provided with a left-hand thread, and the inner wall of the protective cover is provided with a left-hand thread, so as to realize the connection between the nut plug and the protective cover; The inner wall of the cylindrical section is also provided with a right-hand thread for connection with the core-level side mechanism of the main binding mechanism; the two threads on the inner and outer walls of the cylindrical section have the same pitch.

3. The solid rocket booster main binding point cutting device as described in claim 1, characterized in that, Multiple second notches are provided on the outer ring of the annular segment, away from the end face of the cylindrical segment. The size of the second notches in the axial direction is smaller than the size of the annular segment in the axial direction.

4. The solid rocket booster main binding point cutting device as described in claim 1, characterized in that, An anti-loosening component is provided to connect and fix the core side part of the main binding mechanism to the protective cover.

5. The solid rocket booster main binding point cutting device as described in claim 2, characterized in that, The inner ring of the circular segment cooperates with the main binding mechanism's booster side mechanism and is locked at its upper structural position.

6. The solid rocket booster main binding point cutting device as described in claim 2, characterized in that, During separation, the pyrotechnic element cuts the weakening groove, dividing the nut plug into a left section and a right section of the nut plug separation surface. After separation, the cover and the left section of the nut plug separation surface are fixed to the core side of the main binding mechanism by threads, while the right section of the nut plug separation surface is limited to the booster side mechanism of the main binding mechanism, thus achieving effective collection of the residues of each component of the cutting device without generating any excess material.

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