挤出机原理（Extruder principle）.docVIP

挤出机原理（Extruder principle） In the extruder, in general, the most basic and most common is the single screw extruder, mainly including: transmission, feeding device, cylinder, screw, head and mouth mold, such as five parts. Drive part The drive part is usually made up of motors, gearboxes, and bearings. In the extrusion process, the screw speed must be stable, can not change with the screw load changes, so as to maintain the quality of the products consistent. But in different occasions, but also requires the screw can change speed, in order to achieve a device can be extruded out of different plastics or different products requirements. Therefore, this part generally adopts AC commutator motor, DC motor and other devices, to achieve the stepless speed, general screw speed of 10~100 rpm. The function of the drive system is to drive the screw and supply the torque and speed required by the screw in the extrusion process. It is usually composed of an electric motor, a reducer and a bearing. In the same basic structure, the manufacturing cost of reducer is roughly proportional to its shape, size and weight. Because of the shape and weight of the reducer, it means that more materials are consumed during manufacture, and the other bearings are larger, so that the manufacturing cost is increased. Similarly, screw diameter extruder, high-speed and efficient extruder more energy than the conventional extruder, motor power doubled, reducer corresponding to the corresponding increase is necessary. But the high screw speed means low reduction ratio. Compared with the big reduction ratio, the gear modulus increases and the load capacity of the reducer increases as compared with the large reduction speed reducer. Therefore, the volume and weight of the reducer is not linearly proportional to the increase in the power of the motor. If the output divided by the speed reducer as denominator, weight, high speed and high efficiency extruder was small, large number of ordinary extruder.