The large scale folding split screen can be folded and placed on the van vehicle and unfolded when it needs to be used. The LCD screen consists of multiple little screens and is fixed on the frame which can be folded, so it needs the frame to have suffi-cient rigidity. For this purpose,a two-grade-folding mechanism with electric cylinders was designed to satisfy the synchronized folding and unfolding. A four cylinders synchronous motion control strategy was also developed. In the strategy, multi-segment small displace-ment synchronous motion was used to achieve the whole distance synchronous motion control. This method can achieve better synchro-nous control precision in the case of the displacement sensors are difficult to install. Verified by use,this method is proved to be con-cise and effective,with better control precision and reliability.%大型折叠式屏幕是一种可以用于车载的多媒体屏幕,平时可以折叠后收放在大型厢式挂车内,使用时伸出车外再进行展开.显示屏由多块小型LED显示屏固定在特制的框架上组合而成,这要求框架具有足够的刚性,以防止屏幕在展收时因框架变形导致显示屏破裂损坏.为此,设计一种用于安装显示屏的可折叠式金属框架,并研发了基于电动缸的双级折叠屏展收机构.为了实现两级屏的同步展收,设计了专用于大屏展收的四缸同步运动控制策略,通过4个电动缸每次执行相同的微小位移运动指令,运动均到位后再执行下一次相同运动,以多段微小位移的近似同步运动来组合逼近成整个行程的同步运动控制.该方法在位移传感器不易安装的场合下能实现较为精确的同步运动控制.经实际使用验证:该方法简洁有效,控制精度较高,使用时稳定可靠.
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