The invention relates to the technical field of shutters, in particular to a high-quality 
shutter closed orbiting 
system, include a mounting housing, a fixing box is fixed on the opposite side wall inthe mounting shell, A cavity is arranged in the fixing box, Two mutually parallel partitions are fixed on opposite side walls in the cavity, one side of the partition is rotatably connected with a rotating rod, two 
rope winding devices are fixed on the rotating rod, one end of the rotating rod penetrates through the other partition and extends to one side of the partition, and one end of the rotating rod is fixed with a first gear. A method for quantify that rotation angle of a curtain sheet The utility model is convenient to control the angle of the curtain, realizes the lifting speed of thelifting 
rope, accelerates the lifting speed of the 
shutter, improves the user experience, realizes the separation of the lifting 
rope and the ladder rope, prevents the overlapping of the lifting ropeand the ladder rope from causing the 
shutter to get out of control, and adopts a 
metal dust-proof and pressure-resistant fully-closed design at the top, so as to prevent the 
system from being easy tomalfunction due to dust absorption. The utility model is characterized in that the lifting speed of the lifting rope is increased, the user experience is improved, the lifting rope is separated fromthe ladder rope and the ladder rope is prevented from being out of control.