The article gives the practical application about the parallelscrew conveyor in PTA project.
基于实体水平式螺旋输送器在PTA工程中的实际应用，对其进行了全面的论述。
2
Extruder: Parallel double screw extruder is characterized by high output and good plasticization. The vacuum exhaust improves products quality. It can process various sorts of plastic.
挤出机：平行双螺杆挤出机的特点以产量高，塑化优良。真空排气提高了产品的质量。它可以处理各种塑料。
3
Firstly, utilizing the reverse screw, the characteristics of instantaneous motion of 3-RRRRR parallel mechanisms under its initial position and under the general condition were analyzed.