Water driven hydraulic cylinder for closure and injection units of injection molding machines has seals between cylinder chamber and an external chamber for inert material

摘要

Seals(14,18) are located between the cylinder wall(12) and the piston rod(10) and also between the cylinder chamber(6,8) and an external inert chamber(20) filled with an inert material. Seals(14,18) are located between the cylinder wall(12) and the piston rod(10) and also between the cylinder chamber(6,8) and an external inert chamber(20) filled with an inert material. The inert chamber comprises a folding bellows unit(22), one end of which is supported on the cylinder(2) while the other end encloses the piston rod extending through the bellows. The inert chamber has a pressure sensor or is connected to an inert gas source.