On-line injection continuous switching device and switching method thereof

The invention relates to the field of production equipment of synthetic fibers, in particular to an on-line injection continuous switching device and a switching method thereof as well as an on-line adding technology of polyester spun fibers. The on-line injection continuous switching device comprises an electrical automatic control system, an adjustable material adding device, a material control device, a melt pipeline device and a pneumatic switching device, wherein the electrical automatic control system respectively controls the adjustable material adding device, the material control device, the melt pipeline device and the pneumatic switching device. The switching method of the on-line injection continuous switching device comprises the following steps of material adding, material conveying in a balancing way, material injection and primary mixing, replacement of different varieties and specifications, addition stopping of used material. According to the on-line injection continuous switching device and