Waste collecting device for producing polyimide film

A waste collecting device for producing polyimide films comprises a roller installed on a driving shaft, the driving shaft is in transmission connection with a driving motor, the waste collecting device further comprises a collecting barrel used for winding film waste, the roller is sleeved with the collecting barrel, one end of the collecting barrel abuts against a positioning disc, and the other end of the collecting barrel is positioned through a positioning assembly. The positioning assembly comprises a pressing block and a positioning bolt, a mounting groove is formed in the roller, the pressing block is arranged in the mounting groove, a positioning groove is formed in the pressing block, one end of the positioning bolt penetrates through a first screw hole formed in the roller and then extends into the positioning groove, and the pressing block moves outwards in the mounting groove till the pressing block is pressed on the side wall of the collecting barrel sleeve. And the positioning bolt is rotated t