The protection of ball screw pairs and the effect of spiral steel strip protective covers: (1) Protective equipment for ball screw pairs. a. Dust and chip dirt are prohibited from entering the ball screw pairs during use, so it is necessary to install protective equipment. b. When the ball screw pairs are exposed on the machine tool, closed protective covers should be used, such as spiral screw protective covers, circular screw protective covers, folding sleeves, new nylon leather protective covers, etc.