Automatic drop tube control system for adjusting quantity of operation box tubes of spinning frame

The invention relates to an automatic drop tube control system for adjusting quantity of operation box tubes of a spinning frame. The automatic drop tube control system comprises a bobbin counting sensor, a full yarn lifting device, an operation box and a PLC (Programmable Logic Controller), wherein the bobbin counting sensor is arranged on the full yarn lifting device and is used for acquiring data of the quantity of bobbins; the full yarn lifting device is connected with the PLC by virtue of a communication line and is used for conveying full yarn tubes into the operation box by virtue of aconveyor belt; the operation box is arranged just under a lifting outlet of the full yarn lifting device and is used for receiving the full yarn tubes lifted by the full yarn lifting device; the PLC is connected with the bobbin counting sensor by virtue of a communication line and is used for receiving acquired data transmitted by the bobbin counting sensor; a man-machine interface is connected with the PLC by virtue of a