The protection and maintenance method of the trapezoidal screw pair is the same as that of other rolling conflict transmission equipment. It should prevent the entry of hard dust or chips and dirt, so it is necessary to be equipped with protective equipment. If the trapezoidal screw pair is exposed on the machine tool, a closed protective cover should be used, such as a spiral spring steel belt casing, an elastic casing, and a folding casing. When equipment is used, one end of the protective cover is connected to the side surface of the ball nut, and the other end is fixed on the support seat of the trapezoidal screw rod. If the trapezoidal screw rod pair is in a shaded position, a sealing ring can be selected for protection, and the sealing ring is installed at both ends of the nut. The touch-type elastic sealing ring is made of oil-resistant rubber or nylon, and its inner hole is made to match the shape of the screw thread raceway; the touch-type sealing ring has a good dust-proof effect, but due to the touch pressure, the conflict torque is slightly Increase. The non-touch seal ring is also called the labyrinth seal ring. It is made of hard plastic. Its inner hole has the opposite shape to the threaded raceway of the screw rod and has a slight gap. This can prevent conflicting torque, but it has poor dust-proof effect. Prevent hitting the protective equipment during work, and replace the protective equipment in time if it is damaged.