Positioning dust-proof mechanism of ball screw-bar return-flow assembly

The invention relates to a locating dustproof mechanism for ball screw rod return flow component, jacketing a screw cap main body on a ball screw rod with rolling screw channel, where the inner edge of the screw cap main body has a corresponding rolling screw channel and the end of the rolling screw channel of the screw cap main body is formed with a return flow hole, the return flow hole is fixed with a return flow component; the screw cap main body forms a thimble groove, the thimble groove is inserted with an annular fixed scraping piece; the fixed scraping piece is composed of a C-shaped buckle, the outer edge of the buckle is covered with an elastic soft coating and the thickness of the soft coating is greater than the width of the thimble groove so as to make the fixed scraping piece able to be fixed and closely butted against the side surface of the return flow component; the inner edge of the soft coating is formed with a spiral scraping part corresponding to the rolling screw channel of the ball screw rod, and the soft coating forms an arch-shaped scraping edge corresponding to the spiral wall surface and outer diameter of the ball screw rod at one side edge of the spiral scraping part. And the invention uses elasticity of the soft coating to fasten the return flow component in the screw cap main body and has dustproof effect.