TWO STAGE INJECTION UNIT ROTARY VALVE

摘要

An injection unit for an injection molding machine includes a nozzle for dispensing melt to a mold, and a valve housing having a first port in fluid communication with the nozzle. The valve housing has a second port and a third port. A plasticizing barrel is in fluid communication with the second port. A shooting pot is in fluid communication the third port. A valve closure member is mounted in the valve housing. The valve closure member is moveable between a first position in which the first port is in fluid communication with the third port and in fluid isolation of the second port, and a second position in which the second port is in fluid communication with the third port and in fluid isolation of the first port. When in at least one of the first and second positions, fluid communication is provided between the respective ports through a gap provided between an outer surface of the closure member and an inner surface of the valve housing.

主权项

1. An injection unit for an injection molding machine, comprising:
a) a nozzle for dispensing melt to a mold; b) a valve housing having in inner surface defining a valve seat, a first port in fluid communication with the nozzle, and a second port and a third port each spaced apart from the first port; c) a plasticizing barrel in fluid communication with the second port; d) a shooting pot in fluid communication with the third port; and e) a valve closure member mounted in the valve seat, the valve closure member including a cross-bore extending through the valve closure member and a surface notch enclosed at least in part by the inner surface of the housing, the surface notch in fluid isolation from the cross-bore, the valve closure member moveable between a first position in which the first port is in fluid communication with the third port via the cross-bore and in which the second port is in fluid isolation of the first and third ports, and a second position in which the second port is in fluid communication with the third port via the surface notch and the first port is in fluid isolation of the second and third ports.