PC-BALU-204
PC-BALU-204
PC-BALU-204
②主轴的停车制动过程分析 按下停止按钮SB1或SB2→其常闭触点(3-4)或(4-6)断开→接触器KM1因断电而释放,但主轴电动机等因惯性仍然在旋转。按停止按钮时应按到底→其常开触点(109-110)闭合→主轴制动离合器YC1因线圈通电而吸合→使主轴制动,迅速停止旋转。
③主轴的变速冲动过程分析 主轴变速时,首先将变速操纵盘上的变速操作手柄拉出,然后转动变速盘,选好速度后再将变速操作手柄推回。当把变速手柄推回原来位置的过程中,通过机械装置使冲动开关SQ6-1闭合一次,SQ6-2断开。SQ6-2(2-3)断开→KM1接触器断电;SQ6-1瞬时闭合→时间继电器KT通电→其常开触点(5-7)瞬时闭合→接触器KM1瞬时通电→主轴电动机作瞬时转动,以利于变速齿轮进入啮合位置;同时,延时继电器KT线圈通电→其常闭触点(25-22)延时断开→KM1接触器断电,以防止由于操作者延长推回手柄的时间而导致电动机冲动时间过长、变速齿轮转速高而发生打坏轮齿的现象。
主轴正在旋转,主轴变速时不必先按停止按钮再变速。这是因为当变速手柄推回原来位置的过程中,通过机械装置使SQ6-2(2-3)触点断开,使接触器KM1因线圈断电而释放,电动机M1停止转动。
④主轴换刀时的制动过程分析 为了使主轴在换刀时不随意转动,换刀前应将主轴制动。将转换开关SA2扳到换刀位置→其触点(1-2)断开了控制电路的电源,以保证人身安全;另一个触点(109-110)接通了主轴制动电磁离合器YC1,使主轴不能转动。换刀后再将转换开关SA2扳回工作位置→触点SA2-1(1-2)闭合,触点SA2-2(109-110)断开→主轴制动离合器YC1断电,接通控制电路电源。
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