| 摘要 |
PURPOSE: A hot runner system of an injection molding machine is provided to control smooth up and down movement of a valve pin by forming a first thread of a valve pin and a second thread of the pin guide. CONSTITUTION: A hot runner system of an injection molding machine comprises a plate assembly, a multi-stage nozzle assembly(150), a hollow shaft, a valve pin(140) and a pin guide. The plate assembly has sprue-bushings(131,132), a heater and a path hole. The multi-stage nozzle assembly is inserted into the plate assembly in vertical direction. The hollow shaft receives torque from a drive cylinder through a driving pulley.
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