The screw is composed 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, 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: It is to transport, compact, melt, stir and press plastic. These are all accomplished by the rotation of the screw in the barrel. When the screw rotates, the plastic will generate friction and mutual movement on the inner wall of the barrel, the bottom surface of the screw groove, the screw edge advancement surface, and the plastic and the plastic. The advancement of 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 melt the plastic. The design structure of the screw will directly affect the extent of these effects.
The screw rod is composed of a threaded rod, a nut and a ball. Ball screw is the most commonly used transmission element in tool machinery and precision machinery. Its main function is to convert rotary motion into linear motion, or convert torque into axial repetitive force. It also has high precision, reversibility and high Features of efficiency. Due to its low frictional resistance, ball screws are widely used in various industrial equipment and precision instruments.
Working principle: Conical twin screw barrel (which has basically replaced the trapezoidal screw, commonly known as the screw) is used to convert rotary motion into linear motion; or convert linear motion into rotary motion. It has high transmission efficiency and accurate positioning. . When the ball screw is used as the active body, the nut will be converted into linear motion according to the lead of the corresponding specification with the rotation angle of the screw. The passive workpiece can be connected through the nut seat and the nut to realize the corresponding linear motion.