A two-degree-of-freedom telescopic deployment mechanism based on the Mecanum wheel

Abstract

A two-degree-of-freedom sleeve-type deployment mechanism based on mecanum wheels, including inner sleeves, outer sleeves, and 2N sets of mecanum wheel drive mechanisms; 2N sets of mecanum wheel drive mechanisms along the circumferential direction of the inner sleeve Evenly distributed between the inner sleeve and the outer sleeve; 2N sets of mecanum wheel driving mechanisms are located on the same circular surface, and the mecanum wheels in the two mecanum wheel driving mechanisms at both ends of the same diameter have the same rotation direction, Adjacent mecanum wheels have different directions of rotation; when two mecanum wheels at both ends of the same diameter have the same rotation and adjacent mecanum wheels have different rotations, the translational movement of the inner sleeve along the central axis of the outer sleeve is realized ; When all the mecanum wheels turn to the same direction, the inner sleeve rotates around the central axis of the outer sleeve. The invention introduces the mecanum wheel as the power source of the sleeve-type unfolding mechanism, and uses one mechanism to realize the two movements of the sleeve's unfolding and rotating.

Description

technical field [0001] The invention relates to a two-degree-of-freedom sleeve type deployment mechanism, which belongs to the field of machinery. Background technique [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 ...

AI Technical Summary

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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