HOT RUNNER SYSTEM HAVING MAGNETIC ACTUATORS

摘要

Magnetic actuator for actuating at least one valve pin of a hot runner system having a moveable actuation plate, first and second permanent magnets, first and second electromagnets which are fastened opposite to the permanent magnets. The magnetic actuator further comprises first and second insulators mounted to the external sides of the electromagnets for preventing magnetic interference with the hot runner system and for reducing heat transfer from the hot runner system to the magnetic actuator.

主权项

1. A magnetic actuator for actuating at least one valve pin of a hot runner system comprising:
a moveable actuation plate arranged to reciprocate in a straight line along an axis of the at least one valve pin mounted with a rear end to the moveable actuation plate, first and second permanent magnets fastened on top and bottom faces of the moveable actuation plate, first and second electromagnets fastened opposite to the permanent magnets such, that in an opening position of the at least one valve pin, the first permanent magnet abuts the first electromagnet, and in a closing position of the at least one valve pin, the second permanent magnet abuts the second electromagnet, and first and second insulators mounted to the external sides of the electromagnets for preventing magnetic interference with the hot runner system and for reducing heat transfer from the hot runner system to the magnetic actuator.