Double track double-head in-line screw locking device, PC motion control system, visual programming, multiple sets of visual positioning of the product and screw head at the same time, the system automatically compensates to ensure the accuracy of the hole; DEPRAG intelligent electric batch, arbitrary torque, speed setting, output torque waveform and torque value real-time feedback; screw floating displacement sensor detection, NG discharge, yield >99.5%. It adopts double-channel carrier up and down reflow method, independent module type elevator at front and back end, the equipment can be operated independently by a single machine, or it can be connected with other equipment.