Extension rod mechanism

Abstract

The utility model discloses an extension rod mechanism which is characterized by comprising a top-layer synchronous support (1), a middle synchronous support (2), a bottom-layer synchronous support (3), a half-height connecting rod (4), a full-height connecting rod (5), an unfolding torsion spring (6), a separation nut (7), a compression screw (8) and a hinge shaft (9). The method can be used for in-orbit unfolding of the flexible solar wing.

Description

Technical Field

[0001] The present invention relates to a mechanism, in particular to a telescopic rod mechanism. Background Art

[0002] The on-orbit deployment of folded payloads is widespread, such as solar arrays, satellite antennas, etc. Existing deployment mechanisms have the disadvantage of insufficient stiffness, such as CN202111340188.0. In recent years, with the increasing application of flexible solar arrays, it is necessary to develop a deployment mechanism that can adapt to large-sized flexible solar arrays. A telescopic rod mechanism of the present invention can effectively improve the stiffness of the deployment mechanism under the condition of a compact structure. Summary of the Invention

[0003] The purpose of the present invention is to provide a telescopic rod mechanism to improve the structural stiffness after folding and deployment, while maintaining a relatively low structural weight.

[0004] A telescopic rod mechanism, characterized in that it includes a top synchronous bracket, an intermediate synchronous bracket, a bottom synchronous bracket, half-height connecting rods, full-height connecting rods, deployment torsion springs, split nuts, compression screws, and hinge shafts;

[0005] The top synchronous bracket, the intermediate synchronous bracket, and the bottom synchronous bracket are plate-shaped members, with horizontal hinge shafts provided at the edges. The number of hinge shafts can be any natural number greater than or equal to 3;

[0006] The top synchronous bracket and the intermediate synchronous bracket are provided with through holes at the centers;

[0007] The bottom synchronous bracket is provided with threaded holes;

[0008] The half-height connecting rods are connecting rods, with hinge holes provided at both ends, and the end faces at both ends are mutually cooperating limiting contact surfaces;

[0009] The full-height connecting rods are connecting rods, with hinge holes provided at both ends and in the middle, and the end faces at both ends are mutually cooperating limiting contact surfaces;

[0010] The deployment torsion springs are torsion springs;

[0011] The split nuts are split nuts that can be controlled to open by an electrical signal, with flanges provided at the bottoms;

[0012] The compression screws are screws;

[0013] The hinge shafts are cylindrical shafts;

[0014] The hinge hole at one end of the half-height connecting rod at the bottommost is hinged to the hinge shaft of the bottom layer synchronous support. The hinge hole at the other end of the half-height connecting rod at the bottommost is hinged to the hinge hole at one end of the first-layer full-height connecting rod through a hinge shaft. The hinge hole in the middle of the first-layer full-height connecting rod is hinged to the hinge shaft of the middle synchronous support. The hinge hole at the other end of the first-layer full-height connecting rod is hinged to the hinge hole at one end of the second-layer full-height connecting rod. The hinge hole in the middle of the second-layer full-height connecting rod is hinged to the hinge shaft of the middle synchronous support, and so on. The half-height connecting rod at the topmost is hinged to one end of the topmost full-height connecting rod through a hinge shaft. The other end of the half-height connecting rod at the topmost is hinged to the hinge shaft of the top layer synchronous support. The unfolding torsion spring is sleeved on the hinge shaft. The two ends of the unfolding torsion springs at the top layer and the bottom layer abut against the adjacent half-height connecting rod and full-height connecting rod. The two ends of the unfolding torsion springs in the middle layer abut against the two adjacent full-height connecting rods. The separating nut is fixedly connected to the bottom layer synchronous support. The screw head of the pressing screw presses on the top layer synchronous support. The screw rod of the pressing screw passes through the through hole in the center of the top layer synchronous support and is screwed into the separating nut. When the telescopic rod mechanism is fully unfolded to reach the maximum height, the included angle between the adjacent full-height connecting rods or half-height connecting rods is 180 degrees, and the limiting contact surfaces at both ends are in contact with each other, forming a dead point structure;

[0015] The advantages of the present invention are as follows:

[0016] 1. The telescopic rod mechanism of the present invention is lighter in weight and more compact in size in the folded state compared with the coaxial telescopic rods of the same size;

[0017] 2. The telescopic rod mechanism of the present invention has higher support stiffness compared with a single set of connecting rod mechanisms. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 An external view of a partially unfolded telescopic rod mechanism;

[0019] Figure 2 An external view of a fully folded telescopic rod mechanism;

[0020] Figure 3 An external view of the bottom of a fully unfolded telescopic rod mechanism;

[0021] Figure 4 An external view of the top of a fully unfolded telescopic rod mechanism;

[0022] Figure 5 A partial cross-sectional view of the hinged position of adjacent connecting rods in a fully unfolded telescopic rod mechanism. DETAILED DESCRIPTION OF THE INVENTION

[0023] As Figures 1 to 4 shown, a telescopic rod mechanism, characterized by comprising a top layer synchronous support 1, a middle synchronous support 2, a bottom layer synchronous support 3, a half-height connecting rod 4, a full-height connecting rod 5, an unfolding torsion spring 6, a separating nut 7, a pressing screw 8, and a hinge shaft 9;

[0024] The top synchronization bracket 1, the middle synchronization bracket 2, and the bottom synchronization bracket 3 are plate-like members, with horizontal hinge shafts provided at the edges, and the number of hinge shafts can be any natural number greater than or equal to 3;

[0025] The top synchronization bracket 1 and the middle synchronization bracket 2 are provided with through holes at the centers;

[0026] The bottom synchronization bracket 3 is provided with threaded holes;

[0027] The semi-height connecting rod 4 is a connecting rod, with hinge holes provided at both ends, and the end faces at both ends are mutually cooperating limiting contact surfaces;

[0028] The full-height connecting rod 5 is a connecting rod, with hinge holes provided at both ends and in the middle, and the end faces at both ends are mutually cooperating limiting contact surfaces;

[0029] The unfolding torsion spring 6 is a torsion spring;

[0030] The split nut 7 is a split nut that can be controlled to open by an electrical signal, and a flange is provided at the bottom;

[0031] The pressing screw 8 is a screw;

[0032] The hinge shaft 9 is a cylindrical shaft;

[0033] The hinge hole at one end of the semi-height connecting rod 4 at the bottommost is hinged to the hinge shaft of the bottom synchronization bracket 3, the hinge hole at the other end of the semi-height connecting rod 4 at the bottommost is hinged to the hinge hole at one end of the first-layer full-height connecting rod 5 through the hinge shaft 9, the hinge hole in the middle of the first-layer full-height connecting rod 5 is hinged to the hinge shaft of the middle synchronization bracket 2, the hinge hole at the other end of the first-layer full-height connecting rod 5 is hinged to the hinge hole at one end of the second-layer full-height connecting rod 5, the hinge hole in the middle of the second-layer full-height connecting rod 5 is hinged to the hinge shaft of the middle synchronization bracket 2, and so on. The semi-height connecting rod 4 at the topmost is hinged to one end of the topmost full-height connecting rod 5 through the hinge shaft 9, the other end of the semi-height connecting rod 4 at the topmost is hinged to the hinge shaft of the top synchronization bracket 1. The unfolding torsion spring 6 is sleeved on the hinge shaft 9. The two ends of the unfolding torsion springs 6 at the top and bottom abut against the adjacent semi-height connecting rod 4 and full-height connecting rod 5, and the two ends of the unfolding torsion springs 6 in the middle layer abut against the two adjacent full-height connecting rods 5. The split nut 7 is fixedly connected to the bottom synchronization bracket 3, and the screw head of the pressing screw 8 presses on the top synchronization bracket 1. The screw rod of the pressing screw 8 passes through the through hole at the center of the top synchronization bracket 1 and is screwed into the split nut 7.

[0034] Working process:

[0035] Such as Figures 1 to 4As shown, when the separating nut 7 is energized and opened, the thread of the pressing screw 8 is separated from the thread of the separating nut 7. The top layer synchronous bracket 1 is no longer under the pressing force of the pressing screw 8. Under the action of the unfolding torsion spring 6, the extension rod mechanism unfolds from the folded state, and the top layer synchronous bracket 1, the middle layer synchronous bracket 2, and the bottom layer synchronous bracket 3 move away from each other. The semi-height connecting rod 4 and the full-height connecting rod 5 rotate around the hinge shaft 9, as Figure 5 shown. When the extension rod mechanism is fully unfolded to reach the maximum height, the adjacent full-height connecting rods 5 or semi-height connecting rods 4 move to an included angle of 180 degrees, and the limiting contact surfaces at both ends come into contact with each other, forming a dead point structure, and the unfolding of the extension rod mechanism is completed.

Claims

1. A rod extension mechanism, characterized in that: It includes a top synchronous bracket (1), an intermediate synchronous bracket (2), a bottom synchronous bracket (3), a half-height connecting rod (4), a full-height connecting rod (5), an unfolding torsion spring (6), a separation nut (7), a tightening screw (8), and an articulated shaft (9); The top synchronous bracket (1), the middle synchronous bracket (2) and the bottom synchronous bracket (3) are plate-shaped members, and the edges are provided with horizontal hinge axes, and the number of the hinge axes can be any natural number greater than or equal to 3; The top synchronous bracket (1) and the middle synchronous bracket (2) are provided with through holes at their centers; The bottom synchronous bracket (3) is provided with a threaded hole; The half-height connecting rod (4) is a connecting rod, with hinge holes at both ends, and the end surfaces at both ends are mutually matched limiting contact surfaces; The full-height connecting rod (5) is a connecting rod, with hinge holes provided at both ends and the middle, and the end surfaces at both ends are mutually matched limiting contact surfaces; The unfolding torsion spring (6) is a torsion spring; The separation nut (7) is a split nut that can be opened by electrical signal control, and has a flange at the bottom; The clamping screw (8) is a screw; The hinge shaft (9) is a cylindrical shaft; The hinge hole at one end of the half-height connecting rod (4) at the bottom is hinged to the hinge axis of the bottom synchronous bracket (3); the hinge hole at the other end of the half-height connecting rod (4) at the bottom is hinged to the hinge hole at one end of the first-layer full-height connecting rod (5) through the hinge axis (9); the hinge hole in the middle of the first-layer full-height connecting rod (5) is hinged to the hinge axis of the middle synchronous bracket (2); the hinge hole at the other end of the first-layer full-height connecting rod (5) is hinged to the hinge hole at one end of the second-layer full-height connecting rod (5); the hinge hole in the middle of the second-layer full-height connecting rod (5) is hinged to the hinge axis of the middle synchronous bracket (2); and so on. The half-height connecting rod (4) at the top is hinged to one end of the top-layer full-height connecting rod (5) through the hinge axis (9); the other end of the half-height connecting rod (4) at the top is hinged to the hinge hole at one end of the second-layer full-height connecting rod (5). It is hinged to the hinge shaft of the top synchronous bracket (1), the unfolding torsion spring (6) is sleeved on the hinge shaft (9), the two ends of the unfolding torsion spring (6) of the top and bottom layers are against the adjacent half-height connecting rods (4) and full-height connecting rods (5), the two ends of the unfolding torsion spring (6) of the middle layer are against the two adjacent full-height connecting rods (5), the separation nut (7) is fixedly connected to the bottom synchronous bracket (3), the screw head of the clamping screw (8) is pressed on the top synchronous bracket (1), the screw rod of the clamping screw (8) passes through the through hole in the center of the top synchronous bracket (1), and is screwed into the separation nut (7), when the extension rod mechanism is fully unfolded to reach the maximum height, the adjacent full-height connecting rods (5) or half-height connecting rods (4) have an angle of 180 degrees, the limiting contact surfaces at the two ends are in contact with each other, and a dead point structure is formed.

2. A rod extension mechanism according to claim 1, characterized in that: The hinge axes of the top synchronous bracket (1) and the middle synchronous bracket (2) can be hinge holes, and correspondingly, the hinge holes of the half-height connecting rod (4) and the full-height connecting rod (5) can be hinge axes.

3. The rod extension mechanism according to claim 1, characterized in that: The number of layers of the full-height connecting rod (5) can be any natural number greater than or equal to 1.

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