초록 ▼

Provided is an injection unit for the hot runner molding including a heating cylinder having passageways for fused plastic longitudinally formed therethrough and a nozzle member attached to one end of the cylinder and having an injection nozzle. Within the cylinder is fixably disposed a torpedo, whi

Provided is an injection unit for the hot runner molding including a heating cylinder having passageways for fused plastic longitudinally formed therethrough and a nozzle member attached to one end of the cylinder and having an injection nozzle. Within the cylinder is fixably disposed a torpedo, which has a central blind hole formed therethrough in a manner spaced from and parallel with said plastic passageways of the cylinder. Within the central blind hole is disposed a spring assembly, which always biases a pin member abutting against the spring assembly. The pin member is provided with a valve and both are integrally operated. Where a prescribed level of plastic pressure acts on the valve, the valve is separated from the nozzle member to permit the plastic to be injected through the injection nozzle. Where the prescribed plastic pressure does not act on the valve, the valve is made to abut the nozzle member by the bias force of the spring assembly to close the injection nozzle.

대표청구항 ▼

An injection unit for a hot runner molding comprising a heating cylinder having plastic passageways formed therethrough in the longitudinal direction, a torpedo member having a central blind hole formed therethrough in a manner spaced from and parallel with said plastic passageways of the cylinder a

An injection unit for a hot runner molding comprising a heating cylinder having plastic passageways formed therethrough in the longitudinal direction, a torpedo member having a central blind hole formed therethrough in a manner spaced from and parallel with said plastic passageways of the cylinder and disposed fixed within the cylinder, nozzle means attached to one end of said cylinder at the opening side of the central blind hole of the torpedo member and provided with an injection nozzle communicating with the plastic passageways of the cylinder, said heating cylinder having elastically wide operable blind heater holding holes bored at the other cylinder end in a manner substantially equiangularly spaced from one another, valve means having a slidable pin member disposed within the central hole of the torpedo and a valve member connected to the pin member and disposed within the nozzle means, and resilient biasing means so disposed within the central hole of the torpedo as to bias the pin member thereby causing the injection nozzle of the nozzle means to be closed by the valve member.