Exhaust device, exhaust control method and mold structure with exhaust device

Abstract

The invention relates to the technical field of plastic molding, in particular to an exhaust device, an exhaust control method and a mold structure with the exhaust device. The exhaust device is applied to the mold structure, wherein a cavity capable of communicating with the external environment is arranged in the mold structure, and a temperature sensing point is arranged at the bottom of the cavity; the exhaust device comprises a controller, a temperature sensing mechanism connected to the input end of the controller and a mechanical sliding block mechanism connected to the output end of the controller, and the temperature sensing mechanism is in signal connection with the temperature sensing point; and a guide hole communicating with the cavity is arranged in the mold structure, and asealing insert needle capable of rising by the action of the mechanical sliding block mechanism to seal the cavity is arranged in the guide hole. According to the exhaust device, the exhaust control method and the mold structure with the exhaust device, the open type cavity is adopted to inject plastic products firstly, so that the air exhaust is quickly carried out in time, and the defective phenomena of gas entrapment, charring, insufficient welding, bursting in performance test and the like of the plastic products are effectively avoided; and when high-temperature fluid plastic flows to thetemperature sensing point, the mechanical sliding block mechanism is triggered to drive the sealing insert needle to rise to seal the cavity, so that it is ensured that the injection molding processof the plastic products is smoothly completed.

Description

technical field [0001] The invention relates to the technical field of plastic molding, and more specifically, to an exhaust device, an exhaust control method and a mold structure thereof. Background technique [0002] During the injection molding process, the plastic raw material needs to flow into the cavity through the flow channel, and the gas in the cavity is often exhausted by using parting surfaces, thimbles, insert pins, exhaust steel, inserts, etc. However, this method is only suitable for Injection mold with small cavity inner wall space and less gas storage in the cavity; when the wall thickness of the injection molded product is thicker, the injection mold cavity space is large, the gas storage in the cavity is large, and the entire mold cavity is currently closed state, this exhaust method cannot achieve the effect of rapid exhaust, resulting in problems such as air trapping, scorching, and insufficient welding of plastic products. It is easy to burst during per...

AI Technical Summary

Problems solved by technology

[0002] During the injection molding process, the plastic raw material needs to flow into the cavity through the flow channel, and the gas in the cavity is often exhausted by using parting surfaces, thimbles, insert pins, exhaust steel, inserts, etc. However, this method is only suitable for Injection mold with small cavity inner wall space and less gas storage in the cavity; when the wall thickness of the injection molded product is thicker, the injection mold cavity space is large, the gas storage in the cavity is large, and the entire mold cavity is currently closed state, this exhaust method cannot achieve the effect of rapid exhaust, resulting in problems such as air trapping, scorching, and insufficient welding of plastic products. It is easy to burst during performance testing, which seriously affects the surface appearance and molding quality of plastic products. and molding pass rate

Images