摘要
针对某米级光学望远镜设计了四门对开花瓣式主镜保护盖。简要介绍了国内外已建成大口径望远镜主镜保护盖的主要结构形式,利用铰链四杆机构的演化偏置曲柄滑块机构为基体进行优化设计,得出一种不需曲柄存在的四杆机构,建立运动学模型,对其受力状态进行分析,计算了电机所需的驱动力矩、滑块的移动位移及镜盖开关时间。实际工程应用表明,该保护盖对主镜能够有效防尘及保护,单次打开或关闭时间约为62.5 s,在长春地区无故障使用时间大于一年,免维护开关次数大于500次。满足系统设计要求,为后续研究者提供了设计参考。
In order to protect the primary mirror of a meter-class telescope, the petal-type cover was designed. The main structure form of lager aperture telescope which have completed at home and aboard were introduced briefly. On the basis of offset slider-crank mechanism which was evolved from four-bar linkage mechanism, a four bar structure which did not need brace existing was proposed. In addition, the kinematic model was created and the force analysis was carried out. The driving torque of motor, displacement of slider and operation time of cover were calculated. Practical application shows that the cover is reliable and effective to prevent the dust and dropped objects from polluting or damaging the primary mirror. The time to open or close the cover is about 62.5 s. The life of no fault is more than one year using in Changchun area. The operation number of no maintenance are more than 500. So the design satisfies system requirement and provides reference for the coming researchers.
出处
《红外与激光工程》
EI
CSCD
北大核心
2013年第4期988-992,共5页
Infrared and Laser Engineering
基金
中国科学院三期创新重大研究项目
关键词
主镜保护盖
大口径望远镜
曲柄滑块机构
运动模型
primary mirror cover
large aperture telescope
crank-slider mechanism
kinematic model
