The screw consists of a feeding section, a compression section and a metering section. The outer surface of the screw is a cylinder with a spiral groove or a cone with a conical spiral groove. Screws are used in plastic molding equipment, barrel nuts and screw such as plastic profile extruders, injection molding machines, molding machines, rubber machines, etc. Screw and barrel are the core components of plastic molding equipment.
Working principle: plastic transportation, compaction, melting, mixing and pressing. This is achieved by rotating the screws in the barrel. When the screw rotates, the plastic will generate friction and mutual movement between the inner wall of the barrel, the bottom surface of the screw groove, the advancing surface of the screw edge, and the plastic and the plastic. The forward movement of the plastic is the result of this combination of movements, and the heat generated by friction is also absorbed to increase the temperature of the plastic and the molten plastic. The design structure of the screw will directly affect the extent of these effects.
The screw is composed of a screw, a nut and a ball. Ball screws are commonly used transmission components in tool machinery and precision machinery. Its main function is to convert rotary motion into linear motion or torque into axial repetitive force. It has the characteristics of high precision, reversibility and high efficiency. Because of its low frictional resistance, ball screws are widely used in various industrial equipment and precision instruments.
Ball screws are used to convert rotary motion into linear motion. Or it can convert linear motion into rotary motion, which has the advantages of high transmission efficiency and accurate positioning. When the ball screw is used as the driving body, the nut will be converted into linear motion according to the guide of the corresponding specification along with the rotation angle of the screw. The passive workpiece can be connected with the nut through the nut seat to realize the corresponding linear motion.