A retractable space mechanism locking and releasing device

Abstract

The application provides a retraction type space mechanism locking and releasing device for fixing the connection of a fixed component and a load movable component, the fixed component and the load movable component are oppositely arranged, and the device comprises a separation nut assembly, a locking rod assembly and a retraction assembly, the retraction assembly is arranged between the fixed component and the load movable component, the first end of the retraction assembly is fixedly connected with the fixed component, the separation nut assembly is arranged in the retraction assembly, the first end of the separation nut assembly is fixedly connected with the fixed assembly, the locking rod assembly is fixedly connected with the load movable assembly, the locking rod assembly is rotatably connected with the retraction assembly, and the locking rod assembly is also separably connected with the separation nut assembly. The application can increase the movement range of the load movable component and improve the flexibility of mechanism design.

Description

Technical Field

[0001] The present invention relates to the technical field of space mechanisms, and in particular to a retractable space mechanism locking and releasing device. Background Art

[0002] Continuously rotating satellite payloads must withstand significant acceleration overloads during launch and ground testing. To ensure the payload can withstand the overloads during launch, a locking and release mechanism is required to connect the payload's movable and fixed components, ensuring a certain degree of locking stiffness. After the satellite enters orbit, the locking and release mechanism must be reliably separated from the fixed components to ensure that the payload rotates 360° without interference.

[0003] Existing one-time locking and release mechanisms for spatial mechanisms are controlled by explosive bolts, release nuts, or other pyrotechnic locking devices. The locking and release mechanisms use a spring-open or flip-up configuration for position avoidance. To ensure the lateral load-bearing capacity of the locking mechanism, the locking surfaces of the load-moving movable component and the fixed component adopt a boss design. Therefore, the release path design of the movable component needs to consider the interference with the locking table. The movement of the load-moving movable component is similarly restricted to the extension line of the boss slope, which increases the design difficulty of the mechanism structure and limits the ability to realize the mechanism function.

[0004] To this end, the present invention provides a retractable spatial mechanism locking and releasing device. In view of the restrictions on the movement direction of the load movable part by the locking surface boss, the locking surface boss can rotate and retract while the load movable part is unlocked, thereby increasing the movement range of the load movable part and improving the flexibility of the mechanism design. Summary of the Invention

[0005] In view of the defects in the prior art, an object of the present invention is to provide a spatial mechanism locking and releasing device capable of increasing the motion range of a load movable component.

[0006] The retractable space mechanism locking and releasing device provided by the present invention is used for connecting a fixed part and a load movable part. The fixed part and the load movable part are arranged relative to each other, and include a separation nut assembly, a locking rod assembly, and a retraction assembly. The retraction assembly is arranged between the fixed part and the load movable part. The first end of the retraction assembly is fixedly connected to the fixed part. The separation nut assembly is arranged inside the retraction assembly. The first end of the separation nut assembly is fixedly connected to the fixed assembly. The locking rod assembly passes through the load movable part. The locking rod assembly is fixedly connected to the load movable assembly. The locking rod assembly is rotatably connected to the retraction assembly. The retraction assembly is configured to be able to retract and rotate relative to the locking rod assembly. The locking rod assembly is also detachably connected to the separation nut assembly.

[0007] Furthermore, the separation nut assembly includes a first shell, a detonator, and an unlocking mechanism. The first shell is connected to the fixed component, the detonator is arranged on the outside of the first shell, and the unlocking mechanism is arranged inside the first shell. The detonator can ignite the pyrotechnics of the unlocking mechanism.

[0008] Furthermore, the locking rod assembly includes a locking rod, a guide sleeve, a pressure sleeve, a first compression spring, a bearing bowl, a nut, and a head sleeve. The guide sleeve passes through the load movable part, and the pressure sleeve is arranged on the side of the load movable part away from the fixed part. The pressure sleeve is placed on the outside of the guide sleeve. The pressure sleeve and the guide sleeve form a first cavity. The first compression spring is placed in the first cavity. The two ends of the first compression spring are respectively in contact with the guide sleeve and the load movable part. The first compression spring can push the guide sleeve away from the fixed part. The bearing bowl is located at the end of the guide sleeve away from the fixed part. The locking rod passes through the bearing bowl and the guide sleeve. One end of the locking rod is connected to the unlocking mechanism. The other end of the locking rod is sleeved with the nut. The nut presses the bearing bowl, and the head sleeve covers the outside of the guide sleeve and the pressure sleeve.

[0009] Furthermore, the retraction assembly includes an outer shell, a bearing sleeve, an inner shell, a torsion spring, a second compression spring, and a limiting ring. The outer shell is fixedly connected to the fixed component, the limiting ring is fixed on the inner side of the outer shell, and the inner shell is arranged on the limiting ring. The first end of the bearing sleeve is rotatably connected to the guide sleeve, and the second end of the bearing sleeve and the inner shell form a second cavity. The second compression spring is placed in the second cavity. The second compression spring can push the bearing sleeve close to the fixed component, and the inner shell and the outer shell are connected through the torsion spring.

[0010] Furthermore, the connection between the guide sleeve and the load-bearing sleeve is a boss structure.

[0011] Furthermore, a guide groove is provided on the wall surface of the inner shell, and a shift fork is provided on the second end of the bearing sleeve, and the shift fork cooperates with the guide groove.

[0012] Furthermore, a segmented lower conical surface is provided on the outer side of the bearing sleeve, and a segmented upper conical surface is provided on the inner side of the end of the outer shell away from the fixing component, and the upper conical surface matches the lower conical surface.

[0013] Preferably, the end of the load-bearing sleeve is also in contact with the load-bearing movable component.

[0014] Preferably, the first shell and the outer shell are respectively connected to the fixing component by bolts.

[0015] Preferably, the head cover, the compression sleeve and the load movable component are connected by bolts.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The retractable space mechanism locking and releasing device provided by the present invention has a retractable load-bearing sleeve, which can increase the movement space of the load movable part in the unlocked state, so that the movement direction of the load movable part after unlocking is no longer restricted by the interference of the contact surface, thereby improving the flexibility of the mechanism design; the fitting surface between the load-bearing sleeve and the load movable part is set as a boss structure, which can increase the lateral stiffness in the locked state and improve the overall fundamental frequency of the mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0019] Figure 1 Schematic diagram of the locking state of the retractable space mechanism locking and releasing device according to an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the fitting of the guide sleeve and the bearing sleeve according to an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the cooperation between the bearing sleeve and the outer shell according to an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the cooperation between the bearing sleeve and the inner shell according to an embodiment of the present invention;

[0023] Figure 5 Schematic diagram of the release state of the retractable space mechanism locking and releasing device according to an embodiment of the present invention.

[0024] In the figure, 1-fixed part, 2-loaded movable part;

[0025] 100 - separation nut assembly, 101 - first housing, 102 - initiator, 103 - unlocking mechanism;

[0026] 200-locking rod assembly, 201-locking rod, 202-guide sleeve, 203-pressing sleeve, 204-first compression spring, 205-load-bearing bowl, 206-nut, 207-head cover;

[0027] 300-retraction assembly, 301-outer shell, 302-load-bearing sleeve, 303-inner shell, 304-torsion spring, 305-second compression spring, 306-limiting ring. DETAILED DESCRIPTION

[0028] The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the scope of the present invention. These all fall within the scope of protection of the present invention.

[0029] The present invention provides a retractable space mechanism locking and releasing device, which consists of a fixed part, a load movable part, a separation nut assembly, a locking rod assembly and a retraction assembly. After the separation nut completes the tightening of the locking rod, the locking surface rotates and retracts under the drive of an elastic element, providing a rotational motion space for the load movable part.

[0030] like Figure 1 As shown, the retractable space mechanism locking and releasing device of this embodiment includes a fixed component 1, a load-moving component 2, a release nut assembly 100, a locking rod assembly 200, and a retracting assembly 300. The release nut assembly 100 is connected to the fixed component 1, and the locking rod assembly 200 is threadedly connected to the release nut assembly 100 and can be unlocked using an explosive device. It is in contact with the upper surface of the load-moving component 2. The retracting assembly 300 is connected to the fixed component 1 at its lower end, and in contact with the lower surface of the load-moving component 2 at its upper end.

[0031] The separation nut assembly 100 includes a first shell 101, a detonator 102 and an unlocking mechanism 103. The lower end of the first shell 101 is connected to the fixed component 1 by bolts. The dual backup detonator 102 is installed on the outside of the first shell 101, and the unlocking mechanism 103 is arranged on the inside of the first shell 101. In the locked state, the unlocking mechanism 103 is locked to the locking rod 201 through a threaded connection, and has the function of releasing the locking rod under the action of pyrotechnics.

[0032] The locking rod assembly 200 includes a locking rod 201, a guide sleeve 202, a compression sleeve 203, a first compression spring 204, a bearing bowl 205, a nut 206, and a head cover 207. The locking rod 201 is threadedly connected to the unlocking mechanism 103 in the locked state and is disengaged from the unlocking mechanism 103 under the action of the pyrotechnic device; the first compression spring 204 is arranged in the first cavity enclosed by the guide sleeve 202 and the compression sleeve. The two ends of the first compression spring 204 are respectively in contact with the guide sleeve 202 and the load movable part 2. Driven by the first compression spring 204, the guide sleeve 202, the bearing bowl 205, the nut 206, and the locking rod 201 pop up, releasing the connection with the separation nut assembly 100; the head cover 207 and the compression sleeve 203 are bolted to the load movable part 2, limiting the pop-up height of the locking rod 201 and providing a buffering function.

[0033] The locking surface retraction assembly 300 includes an outer shell 301, a bearing sleeve 302, an inner shell 303, a torsion spring 304, a second compression spring 305 and a limit ring 306. The lower end of the outer shell 301 is connected to the fixed part 1 by bolts, the upper surface of the bearing sleeve 302 is in contact with the lower surface of the load movable part 2, and the other side is in contact with the surface of the inner shell 303; the second compression spring 305 is located in the second cavity enclosed by the inner shell 303 and the bearing sleeve 302, and the two ends of the second compression spring 305 are in contact with the inner shell 303 and the bearing sleeve 302 respectively. Under the drive of the second compression spring 305, the bearing sleeve 302 bounces downward to separate from the locking rod 201; the inner shell 303 is connected to the outer shell 301 by the torsion spring 304; the limit ring 306 is installed on the inner surface of the outer shell 301 to limit the downward movement of the inner shell 303.

[0034] like Figure 2 As shown, to lock the bearing sleeve 302 in the locked state, the lower end of the guide sleeve 202 and the corresponding position of the bearing sleeve 302 are designed as a shift fork structure. The guide sleeve 202 is compressed and fixed, thereby limiting the torsional freedom of the bearing sleeve 302. The lower conical surface of the bearing sleeve 302 contacts the mating surface of the outer shell 301, providing support and load transfer. To achieve rotational rebound of the bearing sleeve 302 in the unlocked state, the guide sleeve 202 is driven upward by the first compression spring 204, disengaging the shift fork structure and releasing the torsional freedom of the bearing sleeve 302.

[0035] like Figure 3 As shown, the lower bearing surface of the bearing sleeve 302 is designed as a lower conical surface, which is evenly distributed along the radial direction, and the inner side of the end of the outer shell 301 is also designed with a matching conical surface of the same size; after the bearing sleeve 302 rotates a certain angle, the gap between the lower conical surface of the bearing sleeve 302 and the matching surface of the outer shell 301 corresponds to each other, and the bearing sleeve 302 realizes the freedom of axial retraction.

[0036] like Figure 4 As shown, a shift fork structure is provided at the lower end of the bearing sleeve 302, which cooperates with the guide groove on the wall of the inner shell 303. The inner shell 303 and the outer shell 301 are connected by a torsion spring 304, which drives the inner shell 303 to rotate, thereby transmitting torque to the bearing sleeve 302. The inner shell 303 and the bearing sleeve 302 are connected by a second compression spring 305, which drives the bearing sleeve 302 to retract downward.

[0037] like Figure 5 As shown, the unlocking of the retractable space mechanism locking and releasing device of this embodiment includes the following stages:

[0038] 1) The unlocking mechanism 103 is unlocked by the action of the explosive device, and the locking rod 201 and the guide sleeve 202 are driven upward by the first compression spring 204, unlocking the torsional freedom of the bearing sleeve 302;

[0039] 2) The pre-tightening torque of the torsion spring 304 is applied to the inner housing 303 and transmitted to the bearing sleeve 302 through the guide groove of the inner housing 303, thereby driving the bearing sleeve 302 to rotate;

[0040] 3) After the bearing sleeve 302 rotates a certain angle, the bearing sleeve 302 is separated from the contact surface of the outer shell 301 and rebounds inward under the drive of the second compression spring 305, thereby achieving separation from the load movable component 2.

[0041] The above describes specific embodiments of the present invention. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. The embodiments of this application and the features in the embodiments may be combined with each other in any manner unless there is a conflict.

Claims

1. A retractable space mechanism locking and releasing device for connecting a fixed component and a load movable component, wherein the fixed component and the load movable component are arranged opposite to each other, characterized in that: The invention comprises a separation nut assembly, a locking rod assembly, and a retraction assembly, wherein the retraction assembly is arranged between the fixed component and the load movable component, the first end of the retraction assembly is fixedly connected to the fixed component, the separation nut assembly is arranged inside the retraction assembly, the first end of the separation nut assembly is fixedly connected to the fixed component, the locking rod assembly passes through the load movable component, the locking rod assembly is fixedly connected to the load movable component, the locking rod assembly is rotatably connected to the retraction assembly, the retraction assembly is configured to be able to retract and rotate relative to the locking rod assembly, and the locking rod assembly is also detachably connected to the separation nut assembly; The nut is provided on the other end of the locking rod, and the nut presses the bearing bowl, and the head cover is covered on the outside of the guide sleeve and the compression sleeve; The retraction assembly includes an outer shell, a bearing sleeve, an inner shell, a torsion spring, a second compression spring, and a limiting ring. The outer shell is fixedly connected to the fixed component, the limiting ring is fixed on the inner side of the outer shell, and the inner shell is arranged on the limiting ring. The first end of the bearing sleeve is rotatably connected to the guide sleeve, and the second end of the bearing sleeve and the inner shell form a second cavity. The second compression spring is placed in the second cavity. The second compression spring can push the bearing sleeve close to the fixed component, and the inner shell and the outer shell are connected through the torsion spring; the wall surface of the inner shell is provided with a guide groove, and the second end of the bearing sleeve is provided with a shift fork, and the shift fork cooperates with the guide groove.

2. The retractable space mechanism locking and releasing device according to claim 1, characterized in that: The separation nut assembly includes a first shell, a detonator, and the unlocking mechanism. The first shell is connected to the fixing component. The detonator is arranged on the outside of the first shell. The unlocking mechanism is arranged inside the first shell. The detonator can ignite the pyrotechnics of the unlocking mechanism.

3. The retractable space mechanism locking and releasing device according to claim 2, characterized in that: The connection between the guide sleeve and the bearing sleeve is a boss structure.

4. The retractable space mechanism locking and releasing device according to claim 2, characterized in that: The outer side of the bearing sleeve is provided with a segmented lower conical surface, and the inner side of the end of the outer shell away from the fixing component is provided with a segmented upper conical surface, and the upper conical surface is matched with the lower conical surface.

5. The retractable space mechanism locking and releasing device according to claim 4, characterized in that: The end of the load-bearing sleeve is also in contact with the load-bearing movable component.

6. The retractable space mechanism locking and releasing device according to claim 2, characterized in that: The first shell and the outer shell are respectively connected to the fixing component through bolts.

7. The retractable space mechanism locking and releasing device according to claim 2, characterized in that: The head cover, the compression sleeve and the load movable component are connected by bolts.

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