我们试制的CO_2管状焊丝自动焊机,参照上海劳动电焊机厂CO_2半自动焊机的控制线路,在控制送丝、行走、摆动三个直流微型电机上,分别应用三个固体调速块驱动。为保证焊接过程稳定,对三个直流微型电机的拖动系统提出一定要求:首先要保证电机速度快慢的均匀调节,并使其在较宽范围内实现无级调节;同时要 Our trial-made CO 2 tubular welding wire automatic welding machine, with reference to the control circuit of CO_2 semi-automatic welding machine of Shanghai Labor and Electric Welding Machine Factory, is driven by three solid-state speed control blocks respectively on the three DC micro-motors controlling wire feeding, walking and swinging. To ensure the welding process is stable, the three DC micro-motor drag system put forward some requirements: first of all to ensure uniform motor speed adjustment, and to make it a wide range of stepless adjustment;