CN105952860B - A kind of double double leval jibs repeat Zhan Shou mechanisms - Google Patents

Abstract

The invention belongs to a kind of mechanical structure, more particularly to a kind of double four-bar linkage structures.A kind of double double leval jibs repeat Zhan Shou mechanisms, and technical solution is：It includes：Inner panel (8), outside plate (5), long drive link (2), transmission tripod (3), motor (7), hinge (6) and short pass lever (4) between plate；Compared with the prior art, the present invention has the advantages of：Half driving source is reduced, control system is simplified, and reliability significantly improves；Under the premise of any part is not dismantled, complete to repeat to open up work of knocking off, simplify technique；Extensive modularization extension can be achieved, be conducive to area enlargement, suitable for the expansion of modularization SAR antenna, heat radiator.

Description

A double-four-link repeating expansion and retraction mechanism

technical field

The invention belongs to a mechanical structure, in particular to a double four-bar linkage structure.

Background technique

With the improvement of spacecraft application requirements, flat-panel loads such as SAR antennas and heat radiators are developing in the direction of larger areas and more complex deployment methods, and at the same time strict requirements are placed on their reliability.

SAR antennas and heat radiators need to be large in size and meet the space envelope of the launch vehicle. They are usually disassembled into multiple flat sub-arrays. Agency unfolds. The unfolding and retracting mechanism is required to have the characteristics of high reliability, convenient layout, and simple structure. At the same time, it must be convenient for repeated unfolding and retracting operations on the ground.

my country's first synthetic aperture radar satellite "Yuangan-1" successfully launched in April 2006 and Canada's RADARSAT-1 in 1996 adopted a back-type expandable truss mechanism, and its antenna was composed of 5 sub-arrays, one of which was The array is fixed on the satellite platform, and the other four sub-arrays form two independent antenna wings, which are symmetrically distributed on both sides of the satellite platform. plane array. This technology has the following disadvantages: 1) There are many motors and the control system is complicated, and one failure will affect the realization of the whole star function; 2) When the ground is repeatedly retracted, the output shaft of the motor needs to be disconnected, and the retraction process is more complicated; 3) Not conducive to large-scale modular expansion.

Contents of the invention

The purpose of the present invention is to provide an unfolding and retracting mechanism with few driving sources, simplified control, high reliability, and repeated unfolding and retracting without dismantling any parts.

The technical solution of the present invention is: a double-four-link repeating expansion and retraction mechanism, including: an inner plate, an outer plate with a long transmission rod, a transmission tripod, a motor, a hinge between the plates and a short transmission rod;

One end of the long transmission rod is hinged with the surface of the star as point B, and the other end of the long transmission rod is hinged with the first apex of the transmission tripod as point C;

One end side of the inner plate is connected to the motor output shaft fixed on the star as point A, and the other end side of the inner plate is hinged to the second vertex of the transmission tripod as point E;

One end of the short transmission rod is hinged with the third vertex of the transmission tripod as point D, and the other end of the short transmission rod is hinged with the side of one end of the outer plate as point F;

The outer plate and the inner plate are hinged at the G point through the hinge between the plates;

AB, BC, CE, AE form a four-bar linkage; DE, EG, GF, FD form another four-bar linkage. The working process of the present invention is as follows: when the motor output shaft fixed on the star clockwise, the inner plate rigidly connected with it rotates clockwise, and the long transmission rod also rotates clockwise with the inner plate. The spacing, that is, the distance of AB, BC, CE, AE, DE, EG, GF, FD, can make the inner panel unfold from the folded state at an angle of 90°, and the outer plate from the relatively folded state to unfold exactly 180°; when fixed on the star When the output shaft of the motor is counterclockwise, the inner plate rigidly connected with it will rotate counterclockwise, and the long transmission rod will also rotate counterclockwise with the inner plate, until the inner plate rotates at an angle of 90° and the outer plate rotates 180° to form a fold. State, so as to realize the function that a single motor drives two flat panels to expand and fold at the same time.

Compared with the prior art, the present invention has the following advantages: the driving source is reduced by half, the control system is simplified, and the reliability is obviously improved; without dismantling any parts, the repeated unfolding and retracting work is completed, and the process is simplified; large-scale modularization can be realized Expansion is conducive to large-scale area, and is suitable for the deployment of modular SAR antennas and heat radiators.

Description of drawings

Fig. 1 is a schematic diagram of the folded state of the present invention;

Fig. 2 is a schematic diagram of the unfolded state of the present invention;

Fig. 3 is a schematic diagram of the principle of the mechanism of the present invention.

Detailed ways

Referring to the accompanying drawings, a double-four-link repeating retractable mechanism includes: an inner plate 8, an outer plate 5, a long transmission rod 2, a transmission tripod 3, a motor 7, an inter-plate hinge 6 and a short transmission rod 4;

One end of the long transmission rod 2 is hinged with the surface of the star body 9 as point B, and the other end of the long transmission rod 2 is hinged with the first apex of the transmission tripod 3 as point C;

One end side of the inner plate 8 is connected to the output shaft of the motor 7 fixed on the star body 9 as point A, and the other end side of the inner plate 8 is hinged to the second vertex of the transmission tripod 3 as point E;

One end of the short transmission rod 4 is hinged with the third vertex of the transmission tripod 3 as point D, and the other end of the short transmission rod 4 is hinged with the side of one end of the outer plate 5 as point F;

The outer panel 5 and the inner panel 8 are hinged at the G point through the inter-panel hinge 6;

AB, BC, CE, AE form a four-bar linkage; DE, EG, GF, FD form another four-bar linkage.

In order to adapt to the configuration of the double four-bar linkage mechanism, the short transmission rod 4 in the above scheme is a double helix structure, and its length is adjustable; the length of the long transmission rod 2 can be adjusted by adjusting the gasket.

Claims (4)

1. A double four-link repeating unfolding and retracting mechanism, comprising: inner plate (8), outer plate (5), is characterized in that: also includes: long transmission rod (2), transmission tripod (3), motor ( 7), inter-plate hinge (6) and short transmission rod (4); One end of the long transmission rod (2) is hinged to the surface of the satellite body (9) as point B, and the other end of the long transmission rod (2) is hinged to the first vertex of the transmission tripod (3) as point C point; One end side of the inner plate (8) is connected to the output shaft of the motor (7) fixed on the satellite star (9) as point A, and the other end side of the inner plate (8) is connected to the transmission The second vertex of tripod (3) is hinged as E point; One end of the short transmission rod (4) is hinged to the third vertex of the transmission tripod (3) as point D, and the other end of the short transmission rod (4) is hinged to the side of one end of the outer plate (5) is point F; The outer panel (5) and the inner panel (8) are hinged at point G through the inter-panel hinge (6); AB, BC, CE, AE form a four-bar linkage; DE, EG, GF, FD form another four-bar linkage. 2. A double-four-link repeating retractable mechanism according to claim 1, characterized in that: the lengths of the short transmission rod (4) and the long transmission rod (2) are adjustable. 3. A double-four-link repeating retractable mechanism according to claim 2, characterized in that: the length of the short transmission rod (4) is adjusted through its double-helix structure. 4. A double-four-link repeating retractable mechanism according to claim 2 or 3, characterized in that: the length of the long transmission rod (2) is adjusted by adjusting a shim.