Double-station tail jacking device of horizontal spinning equipment

The invention relates to application of horizontal spinning equipment to die processing of large end socket parts or conical parts. At the initial stage of spinning machining, the tail top disc is small, torque generated by spinning a workpiece is relatively small, but the torque generated by feeding towards the edge along with spinning machining is increased, the small tail top disc cannot provide enough jacking force and prevent the workpiece from rotating relative to a mold, and at the moment, a larger tail top disc needs to be replaced. However, only one set of tail top tray can be mounted on universal spinning equipment, and machining needs to be suspended for replacement. By adopting the double-tail top, time can be saved, efficiency can be improved, and labor intensity can be reduced. And internal and external tail top pressure is adjustable. The inner tail top and the outer tail top are provided with perfect detection devices which can detect whether the inner tail top extends out and whether the oute