Actuating magnet for moving shut-off needle of hot runner nozzle of injection molding tool, has armature displaced within magnetic rings, which are connected with each other, where rings and pole ring are held by tubes

摘要

The magnet has a moving magnet part comprising an armature (1), which is dynamically coupled to a shut-off needle. The moving magnet part is provided with a permanent magnet part i.e. axially magnetized ring magnet part (5), which is arranged such that the permanent magnet part exerts additional magnetic force on the armature in movement direction. A pole ring (6) is arranged between magnetic rings. The armature is displaced within the magnetic rings, which are coaxially arranged with each other. The magnetic rings and the pole ring are held by fixing- and/or guiding tubes (9). The magnetic rings and the pole ring are provided in a fixed tube made of non-magnetic material.