Througn designing three axial slots in internal threaded portion and optimizing nib structure,a design was made on the injection mould with a two-step ejecting mechanism with non-rotating.

According to structure characteristics and problems in the existing mold of the plug base, analyzed the mold structure, as well as secondary ejection structure by tension plate pendulum block was established, in addition, solved the problems of internal surface of the plug base becoming dark and out surface having burr.

Taking relay cover as an example, introduced a new secondary ejection mold which was more simple and could be controlled preciously.

A new latch-style secondary ejection mechanism is illustrated.

The demoulding structure of automatic thread demoulding and second ejection with compressed air are adopted.

Another characteristic of the mould is the ejector mechanism used second ejection, which solved the stroke problem of the core-pulling insert in the ejection.

And the mechanisms of forced demoulding, two_time ejection and delayed ejection by a sliding core used in the injection mould were introduced.

The device is usually used to resetting prior to ejection, two_step ejection, ejection mechanism of the fixed half of the mould and two_step mould opening mechanism.