Injection molding device used for injection-molded component with zero rotating stop structure and double internal threads with different pitches

Abstract

The invention relates to an injection molding device used for an injection-molded component with zero rotating stop structure and double internal threads with different pitches. The injection-molded component is provided with external threads and two internal threads with different pitches and is provided with a clamping structure. The injection molding device comprises a moving die block with a front die and a fixed die block with two symmetrical sliders and a rear die, wherein the front die, the rear die and the two sliders are enclosed, forming an injection molding cavity; the rear die is athreaded rotating shaft; the fixed die block is further provided with a power mechanism for an ejecting mechanism and the threaded rotating shaft; a clamping mechanism used for the circumferential limiting of the clamping structure is arranged on the fixed die block; the threaded rotating shaft is a piston type double rotating shaft; the piston type double rotating shaft comprises an outer pipe and an inner shaft which are arranged in an inner and outer sleeving manner; first external threads and second external threads corresponding to the two internal threads of the injection-molded component are separately arranged at the upper ends of the outer pipe and the inner shaft; the inner shaft is provided with a strip-shaped radial through hole arranged in the axial direction; a connecting rod running through the radial through hole is arranged in the outer pipe; and a synchronous rotating unit and an axial slip unit of the outer pipe and the inner shaft are formed through the cooperationof the connecting rod and the radial through hole.

Description

technical field [0001] The invention belongs to the technical field of injection molding, and in particular relates to an injection molding device for injection molded parts with no anti-rotation structure and double internal threads with different pitches. Background technique [0002] At present, in the production of threaded pipe fitting injection molded parts, if there is an internal thread, it must be demoulded by rotation, and the product must have an anti-rotation positioning structure; for the external thread, the Huff mold is generally used, that is, the cavity of the external thread is split. Simple structure and easy demoulding. For injection-molded pipe fittings with both internal and external threads and different pitches of the double internal threads, although rare, in the prior art, the external threads can be injected first, and the double internal threads can only meet the requirements of one thread injection during injection molding. Synchronous demouldin...

AI Technical Summary

Problems solved by technology

For injection-molded pipe fittings with both internal and external threads and different pitches of the double internal threads, although rare, in the prior art, the external threads can be injected first, and the double internal threads can only meet the requirements of one thread injection during injection molding. Synchronous demoulding cannot be achieved, and secondary machining or manual thread inserts are required to perfect the double internal thread. In the prior art, there is no one-time formed internal and external thread and no anti-rotation structure pipe fittings. In addition, if there are different pitches in the pipe fittings If there are two internal threads, the single mandrel rotation and demoulding will damage the small pitch parts. Therefore, for pipe fittings with different pitches and double internal threads, it is necessary to design the injection molding device

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