Auto vent for foam molds

The present invention discloses an auto vent for a foaming mold. The purpose of the present invention is to provide a vent which facilitates stable discharge of gas generated within the mold, removal of formed within the vent, and installation of the vent in the foaming mold. According to the present invention, the auto vent includes: a cylinder which is installed on an outer portion of the mold, has a pair of air hose coupling holes longitudinally formed in the side surface thereof, and has a first coupling unit formed in the bottom side thereof wherein a first moving hole is formed in the center of the first coupling unit, and a plurality of hemispherical position alignment grooves are formed at equal intervals in an outer circumferential surface of the first coupling unit; a piston of which one end side is positioned within the cylinder, and which is driven by a pneumatic pressure supplied to the cylinder; a gas discharge unit which is formed in the other end side of the piston, and includes a hemispherical rounded contact unit formed on an end portion of the piston and exposed to the inside of the foaming mold and a plurality of flutes processed to be round and formed to be extended to the contact unit along the longitudinal direction of the piston; and a piston guide which fixes the cylinder to the mold and guides driving of the piston at the same time by including a first coupling unit coupled to the first coupling unit and a third coupling unit formed to be extended from the second coupling unit, having a second moving hole which is formed in the center thereof and into which the piston can be inserted, and having a screw thread formed on an outer circumferential surface thereof to be installed and fixed to the foaming mold. Therefore, the auto vent performs removal of burr formed when a foaming solution flows into the flutes and is cured within the flutes by enabling the piston to be repeatedly driven instantaneously promptly through the cylinder after withdrawing a molded product from the foaming mold. 본 발명은 발포 금형용 오토 벤트를 개시한다. 본 발명에 따른 오토 벤트는 금형 외부에 설치되며, 측면에는 길이 방향으로 한 쌍의 에어호스 체결홀이 형성되고, 저면측에는 중앙에 제 1 이동홀 및 외주면에 반구형의 위치 정렬홈이 등간격으로 복수개 형성된 제 1 체결부가 형성되는 실린더; 일단측이 상기 실린더 내부에 위치되어 상기 실린더에 공급되는 공압에 의해 구동되는 피스톤; 상기 피스톤의 타단측에 형성되며, 상기 피스톤의 단부에 형성되고, 발포 금형 내부로 노출되는 반구 형태의 라운드진 접촉부와, 라운드지게 가공되어 상기 피스톤의 길이방향을 따라 접촉부까지 연장 형성되는 복수의 플루트(flutes)가 형성되는 가스 배출부; 및 상기 제 1 체결부와 결합되기 위한 제 2 체결부와, 상기 제 2 체결부로부터 연장 형성되고 중앙에 상기 피스톤이 삽입 가능한 제 2 이동홀이 형성되며 외주면에는 발포 금형에