A pre-separated shell auxiliary locking mechanism

Abstract

The present invention discloses a pre-separation shell auxiliary locking mechanism, which belongs to the field of aerospace technology, and includes a lock tongue, an articulated arm, a fixed arm, a spring, a pin, and a base; wherein the articulated arm, the fixed arm, the spring, and the pin are symmetrically arranged in two groups on the base, one end of the articulated arm is hingedly connected to the base through the pin, and a spring is arranged between the other end and the fixed arm, and the fixed arm is fixedly connected to the base. The lock tongue and the articulated arm are provided with corresponding small-angle wedge surfaces and large-angle wedge surfaces. After the shell is installed, the lock tongue contacts the articulated arm through the large-angle wedge surface, and the spring can only be unlocked by using a sufficiently large driving force to compress the spring. The device of the present invention solves the problem that the pre-separation shell is deformed due to stress release after production due to poor rigidity and the shell is deformed due to stress during installation, resulting in the shell shape being out of tolerance and the sealing not meeting the requirements. At the same time, the structure has the advantages of reliable locking, simple structure, small installation space, low cost and good maintainability.

Description

Technical Field

[0001] The present invention belongs to the field of aerospace technology, and in particular relates to a pre-separation shell auxiliary locking mechanism. Background Art

[0002] As a conventional transport vehicle, a rocket's mission is to deliver payloads into space. To ensure the payload is delivered to its target location, specialized shell opening methods are required in various fields, including space, aviation, and missiles, to provide access for payload delivery. The actuator-driven pre-separation shell method is an ideal method for payload delivery due to its advantages, including low impact during shell separation, precise and controllable separation speed and attitude, pollution-free and debris-free opening, and excellent maintainability.

[0003] Taking into account factors such as installation space and development costs, pre-separation shells are generally only equipped with separation actuators at the ends to lock and separate the shells. However, the rigidity of pre-separation shells is usually poor, and the shells are prone to secondary deformation due to stress release after production. During installation, the shells will arch in the middle due to the locking of the actuators at both ends, which can easily lead to an out-of-tolerance shell shape and cause certain interference to the aerodynamics, and the watertightness and airtightness of the structure cannot be guaranteed.

[0004] Therefore, there is a technical demand for developing a pre-separation shell auxiliary locking mechanism. Summary of the Invention

[0005] In response to the above defects or improvement needs of the prior art, the present invention provides a pre-separation shell auxiliary locking mechanism, which can solve the problems of pre-separation shell deformation due to stress release after production due to poor rigidity, and shell deformation due to stress during installation, resulting in shell shape tolerance and sealing that does not meet the requirements. At the same time, the structure has the advantages of reliable locking, simple structure, small installation space, low cost and good maintainability.

[0006] The pre-separation shell auxiliary locking mechanism described in the present invention includes a lock tongue, a hinged arm, a fixed arm, a spring, a pin shaft, and a base. The lock tongue is fixedly connected to the shell piece, and the hinged arm, the fixed arm, the spring, and the pin shaft are symmetrically arranged in two groups on the base. The pin shaft is installed on the base, one end of the hinged arm is hinged to the pin shaft, and the spring is arranged between the other end and the fixed arm. The fixed arm is fixedly connected to the base, and the base is fixedly connected to the cabin body through an adapter.

[0007] Through the above inventive concept, when the shell is locked, the spring force drives the hinged arm to contact the lock tongue, providing a locking force for the separated shell; when a certain driving force is provided to the separated shell, the lock tongue overcomes the spring force and compresses the spring through the hinged arm to achieve installation or unlocking.

[0008] Furthermore, the fixed arm and the articulated arm may be provided with a guide rod, and the spring is mounted on the guide rod so as to be limited between the fixed arm and the articulated arm. Such an arrangement can ensure that the spring is stable and does not move during compression or recovery.

[0009] Furthermore, the pin passes through the articulated arm and base, and a latch can be provided at the end extending from the base for position limiting. There is at least one set of clearance fits between the pin and the articulated arm, and between the pin and the base. Alternatively, the pin passes through the articulated arm and base, and is secured to the base via threads, in which case a clearance fit must be ensured between the pin and the articulated arm.

[0010] Furthermore, the locking tongue and the hinged arm are provided with corresponding low-angle and high-angle wedge surfaces. During installation of the shell, the locking tongue and the hinged arm contact via the low-angle wedge surface, requiring minimal actuation force. Once the shell is in place, the locking tongue and the hinged arm contact via the high-angle wedge surface, requiring a greater actuation force to unlock. Selecting the appropriate wedge surface angle based on actual design requirements ensures simple and easy installation of the shell, while ensuring a secure and reliable lock once locked.

[0011] Furthermore, a limiting boss is provided at the base of the articulated arms to limit relative rotation between the articulated arms. In the above inventive concept, when the shell is not installed, the limiting boss can limit the relative movement of the articulated arms driven by the spring, so that the distance between the tops of the two articulated arms is greater than the width of the tip of the lock tongue, ensuring that the lock tongue can contact the articulated arms through a small-angle wedge surface when the shell is installed.

[0012] The shell auxiliary locking mechanism described in the present invention can effectively solve the problems of poor rigidity of the pre-separated shell, deformation due to stress release after production, and deformation of the shell under force during installation, resulting in excessive shell shape and unsatisfactory sealing. At the same time, the structure has the advantages of reliable locking, simple structure, small installation space, low cost and good maintainability. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the appearance of the auxiliary locking mechanism in an embodiment of the present invention;

[0014] Figure 2 Schematic diagram of the connection and locking of the auxiliary locking mechanism with the shell, the adapter and the cabin body in an embodiment of the present invention;

[0015] Figure 3 It is a schematic diagram of force analysis during installation of the auxiliary locking mechanism in an embodiment of the present invention.

[0016] Throughout the drawings, the same reference numerals are used to denote the same elements or structures, wherein:

[0017] 1-Lock tongue 2-Hinged arm 3-Fixed arm

[0018] 4- Spring 5- Pin 6- Base

[0019] 7-shell 8-adapter 9-cabin DETAILED DESCRIPTION

[0020] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0021] like Figure 1 Figure 2 is a schematic diagram of a shell-assisted locking mechanism provided by the present invention. The mechanism comprises a locking tongue 1, an articulated arm 2, a fixed arm 3, a spring 4, a pin 5, and a base 6. Two groups of the articulated arm 2, fixed arm 3, spring 4, and pin 5 are symmetrically arranged on the base 6. The pin 5 is mounted on the base 6. One end of the articulated arm 2 is hinged to the pin 5, and the other end of the articulated arm 2 is interposed with the spring 4 between the fixed arm 3. The fixed arm 3 is fixedly connected to the base 6.

[0022] like Figure 2 The figure shows a schematic diagram of the auxiliary locking mechanism provided by the present invention connected to the shell, adapter, and cabin. The lock tongue 1 is fixed to the shell 7, and the base 6 is fixed to the cabin 9 via the adapter 8. The pin 5 passes through the articulated arm 2 and is fixed to the base 6 via threads. The pin 5 and the articulated arm 2 have a clearance fit, ensuring that the articulated arm 2 can rotate about the pin 5 when subjected to force. Guide rods are provided on the fixed arm 3 and the articulated arm 2, and the spring 4 is mounted on the guide rods to achieve a limit between the fixed arm 3 and the articulated arm 2, ensuring that the spring 4 is stable and does not move during compression or recovery.

[0023] like Figure 3 The figure shows a schematic diagram of the force analysis during the installation of the auxiliary locking mechanism in an embodiment of the present invention. The lock tongue 1 and the hinged arm 2 are both provided with corresponding small-angle (15°) wedge surfaces and large-angle (45°) wedge surfaces. During installation, the lock tongue 1 on the shell 7 contacts the hinged arm 2 through the small-angle (15°) wedge surface. When the shell 7 is installed, ignoring the friction between the spring 4 and the hinged arm 2 and the rolling friction generated by the rotation of the hinged arm 2, the force relationship of the locking device when the lock tongue 1 moves and the force is balanced is:

[0024] T=2(F N sinα+F f cosα) (1)

[0025] Ff =μF N (2)

[0026] F t =F N 'cosα-F f 'sinα (3)

[0027] In formulas (1), (2), and (3):

[0028] T—thrust for installing the separation shell 7;

[0029] F t - the pressure of the locking spring 4 on the articulated arm 2, i.e. the spring force;

[0030] F N - normal pressure of the articulated arm 2 on the lock tongue 1 on the wedge surface;

[0031] F N '—normal pressure of the lock tongue 1 on the hinged arm 2 on the wedge surface;

[0032] F f - Friction force of the articulated arm 2 on the lock tongue 1 on the wedge surface;

[0033] F f '—Friction force of the lock tongue 1 on the hinged arm 2 on the wedge surface;

[0034] α—wedge surface contact angle;

[0035] μ—static friction coefficient, take 0.15.

[0036] When the shell 7 is installed, the spring 4 is compressed to the maximum when the lock tongue 1 is about to move along the small angle wedge surface. At this time, the maximum elastic force is 50.5N. According to α=15°, μ=0.15, when F t =50.5N, T = 44.0N; that is, when the installation thrust on the separation shell 7 reaches 44.0N, the spring force of the locking mechanism can be overcome and the separation shell 7 can be installed on the cabin 9. This installation can be achieved manually, which is simple and convenient. After the separation shell 7 is installed in place, the lock tongue 1 and the hinged arm 2 are in contact through a large-angle (45°) wedge surface. Similarly to formula (1), the locking force of the locking device on the shell 7 can be calculated to be 136.6N, which can achieve a firm and reliable locking.

[0037] Furthermore, a limiting boss is provided at the root of the articulated arm 2. When the two articulated arms 2 rotate relative to each other under the action of the spring 4, until the limiting boss rotates around the pin shaft 5 and contacts the base 6, the distance between the ends of the two articulated arms is 7 mm, and the width of the tip of the lock tongue 1 is 5 mm, so that when the shell 7 is installed, the tip of the lock tongue 1 can enter between the two articulated arms 2, thereby ensuring that the lock tongue 1 and the articulated arm 2 are in contact through a small-angle wedge surface, thereby realizing the installation of the locking device.

[0038] It will be easily understood by those skilled in the art that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A pre-separation shell auxiliary locking mechanism, comprising a lock tongue (1), a hinge arm (2), a fixed arm (3), a spring (4), a pin (5), and a base (6), characterized in that: The hinged arm (2), the fixed arm (3), the spring (4), and the pin (5) are symmetrically arranged in two groups on the base (6); the pin (5) is mounted on the base (6); one end of the hinged arm (2) is hinged to the pin (5), and a spring (4) is provided between the other end and the fixed arm (3); the fixed arm (3) is fixedly connected to the base (6); The fixed arm (3) and the hinged arm (2) are both provided with guide rods, and the spring (4) is mounted on the guide rods; The locking tongue (1) and the hinged arm (2) are provided with corresponding small-angle wedge surfaces and large-angle wedge surfaces.

2. A pre-separation shell auxiliary locking mechanism according to claim 1, characterized in that: The pin shaft (5) passes through the hinged arm (2) and the base (6), and a pin for limiting can be provided at the end extending out of the base (6).

3. A pre-separation shell auxiliary locking mechanism according to claim 1 or 2, characterized in that: At least one group of gap fits is formed between the pin shaft (5) and the hinged arm (2), and between the pin shaft (5) and the base (6).

4. The pre-separation shell auxiliary locking mechanism according to claim 1, characterized in that: The pin shaft (5) passes through the articulated arm (2) and the base (6); the pin shaft (5) and the base (6) are fixed via threads; and the pin shaft (5) and the articulated arm (2) are in clearance fit.

5. A pre-separation shell auxiliary locking mechanism according to claim 1, 2 or 4, characterized in that: A limiting boss is provided at the root of the articulated arm (2).

6. A pre-separation shell auxiliary locking mechanism according to claim 3, characterized in that: A limiting boss is provided at the root of the articulated arm (2).

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