On-line DTY quality monitoring control method and system for elasticizer

The invention discloses an elasticizer online DTY quality monitoring control method and system, and the method employs an over-tail detection sensor to detect the over-tail of a POY precursor, and executes the following steps when the over-tail detection sensor detects the over-tail each time: the over-tail detection sensor generates a POY precursor over-tail signal; the communication controller inquires the POY precursor tail passing signal and forwards the POY precursor tail passing signal to the upper computer; after the POY precursor tail passing signal is received, software of the upper computer issues a DTY doffing instruction to the communication controller; after the doffing instruction is received, the communication controller controls a doffing mechanism of the elasticizer to execute doffing action; the doffing execution mechanism completes the doffing action and sends a doffing completion response command to the upper computer; and the software of the upper computer receives the response after doff