Nozzle head valve needle structure with positioning and guiding structure

Abstract

The utility model discloses a nozzle head valve needle structure with a positioning guide structure, which comprises a nozzle head, a guide structure and a valve needle, the nozzle head is a pipe body with a fluid channel inside, the lower end of the pipe body is provided with a fluid outlet, the guide structure is composed of a plurality of guide wings, and the valve needle is arranged in the guide structure. The guide wings are arranged on the lower portion of the fluid channel and distributed at intervals in the circumferential direction of the axis of the fluid channel, a guide channel is defined by the guide wings, the valve needle is installed in the fluid channel in a sliding mode and stretches into the guide channel, and the outer circumferential wall of the lower portion of the valve needle is attached to the inner side walls of the guide wings. In the actual design, the guide wings distributed in the circumferential direction are arranged in the fluid channel of the nozzle head, and then the lower portion of the needle valve is guided and limited, so that in the actual work, even if the pressure of plastic fluid is large, it can be guaranteed that the stroke of the needle valve is stable, the problem of eccentricity is avoided, the opening and closing precision of a fluid outlet is effectively improved, and the service life of the needle valve is prolonged. And the injection molding stability is further improved.

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