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咨询***：18506919598（卢工）
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1.数控冲床机械控制的主轴准停装置
数控冲床采用机械控制的主轴准停装置定向比较可靠、***，但结构复杂。如图6. 5所示，主轴准停装置设在主轴尾端，当主轴需要停车换刀时，发出降速信号，主轴箱自动改变传动路线，使主轴换到低速运转；时间继电器***数秒后，开始接通无触点开关4；当凸轮2上的感应片对准无触点开关时，发出准停信号，立即切断主电动机电源，脱开与主轴的传动联系，以消除传动系统中大部分旋转零件的惯性对主轴准停的影响，使主轴作低速空转；再经过时间继电器的短暂***，接通液压油，使***活塞6带动***滚子5向上运动，并压紧在凸轮1的外表面。当主轴带动凸轮l慢速转至其上的V形槽对准滚子5时，滚子进入槽内，使主轴准确停止，同时限位开关7发出信号，表示已完成准停。如果在规定的时间内限位开关7未发出完成准停信号，即表示滚子5没有进入V形槽，这时时间继电器发出重新***信号，并重复上述动作，直到完成准确停止；然后，***活塞6退回到释放位置，行程开关8发出相应的信号。
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