Two-degree-of-freedom sleeve type unfolding mechanism based on Mecanum wheels

Abstract

A two-degree-of-freedom sleeve type unfolding mechanism based on Mecanum wheels comprises an inner sleeve, an outer sleeve and 2N groups of Mecanum wheel driving mechanisms; 2N groups of Mecanum wheeldriving mechanisms are uniformly distributed between the inner sleeve and the outer sleeve in the circumferential direction of the inner sleeve; the 2N groups of Mecanum wheel driving mechanisms arelocated on the same circular surface, the rotation directions of Mecanum wheels in the two Mecanum wheel driving mechanisms located at the two ends of the same diameter are the same, and the rotationdirections of the adjacent Mecanum wheels are different; when the two Mecanum wheels located at the two ends of the same diameter rotate in the same direction and the adjacent Mecanum wheels rotate indifferent directions, translational motion of the inner sleeve along the central axis of the outer sleeve is achieved; when all the Mecanum wheels rotate in the same direction, the inner sleeve rotates around the central axis of the outer sleeve. Mecanum wheels are introduced to serve as a power source of the sleeve type unfolding mechanism, and the unfolding motion and the rotating motion of a sleeve are achieved through one mechanism.

Description

technical field [0001] The invention relates to a two-degree-of-freedom sleeve-type unfolding mechanism, which belongs to the field of machinery. Background technique [0002] At present, the problem of direct sunlight for large-diameter optical loads is very prominent. On the one hand, direct sunlight causes a large change in the temperature field, which affects the performance of the optomechanical structure. On the other hand, it introduces stray light and thermal radiation, especially for low-light channels and infrared imaging channels. , resulting in the system's on-orbit workable period being greatly reduced, making it impossible to achieve continuous observation and monitoring. Therefore, a hood is required to block the sunlight. Generally, the front end of the hood has a certain inclination angle. During the orbital operation, the incident direction of the sun changes periodically, and the direction of the inclination angle needs to change with the direction of the ...

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Problems solved by technology

[0002] At present, the problem of large-aperture optical loads being exposed to direct sunlight is very prominent. On the one hand, direct sunlight causes a large change in the temperature field and affects the performance of the optical-mechanical structure. On the other hand, it introduces stray light and thermal radiation, especially causing interference to the low-light channel and infrared imaging channel. , resulting in a greatly reduced working period of the system in orbit, unable to achieve continuous observation and monitoring

Therefore, a shading cover is required to block the sunlight. Generally, the front end of the shading cover has a certain inclination angle. During orbital operation, the incident direction of the sun changes periodically, and the direction of the inclination angle needs to change with the direction of the incident angle of the sun. The traditional solution requires the star to adjust its attitude frequently. As a result, the star consumes more fuel, the attitude is stable for a long time, and the effective phase formation time is short

The traditional rigid hood can no longer meet the load's requirements for launch envelope and quality, and there is an urgent need for breakthroughs in large storage ratio and rotatable

[0003] At present, most of the expandable and rotatable sunshade schemes realize the rotation and deployment functions of the sunshade through two different mechanisms respectively. The rotation of the mechanism requires the use of large-diameter bearings, and the mechanism is complex in composition, high in weight, and poor in reliability.

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