Actuating cylinder for a valve gated injection moulding device
AssigneeSynventive Molding Solutions, Inc.
InventorsPeter Sattler, Udo Liebram
Life of this patent
Estimating the term…
Abstract
An injection molding device (1) having a valve pin (11) and an actuating cyclinder (15) connected to the valve pin (11). The valve pin head (37) is releasably attached to the piston (33) of the cylinder such that the cylinder can be removed while leaving the valve pin (11) from the nozzle such that a low headspace can be achieved above the nozzle.
Claims9
Injection moulding device (1) comprising a mould body (2,5) having a cavity (4), an elongated nozzle (3) seated in the cavity, a valve pin (11) coaxially in the nozzle and actuating means (15) connected to the valve pin for axially displacing the valve pin in the nozzle, the actuating means comprising a cylinder housing (30) having a first and a second pressure medium inlet (38,39), and a piston (33) reciprocatable in the cylinder housing, the piston (33) being coupled to the valve pin (11), characterised in that the cylinder housing is placed above the valve pin (11), coaxial therewith, the cylinder housing (30) being detachably coupled to a base member (14) on the mould body (2,5) and said cylinder housing defining a chamber with an upper part (31) having a first diameter, the piston (33) having a piston head (34) which is in contacting relationship with the walls of the upper chamber part (31), the first and second pressure medium inlets (38,39) connecting to the upper chamber part (31) above and below the piston head, respectively, and a lower chamber part (32) comprising a height adjustment means (40) that is axially displaceable in the cylinder housing (30), the height adjustment means (40) having a bore with a diameter, smaller than the diameter of the upper chamber part (31), the piston comprising a stem (35) being slidably seated in the bore of the height adjustment means (40), the valve pin (11) being guided through a bore (47) in the base member (14) and through the bore of the height adjustment means (40) and having a valve pin head (37) releasably attached to the piston (33).
Injection moulding device (1) comprising a mould body (2,5) having a cavity, an elongated nozzle (3) seated in the cavity, a valve pin (11) extending coaxially in the nozzle and actuating means (15) connected to the valve pin for axially displacing the valve pin in the nozzle, the actuating means comprising a cylinder housing (30) having a first and a second pressure medium inlet (38,39) and a piston (33) reciprocatable in the cylinder housing (30), the piston (33) being coupled to the valve pin (11), characterised in that the cylinder housing is placed above the valve pin (11), coaxial therewith, the cylinder housing (33) being detachably coupled to a base member (14) on the mould body (2,5), and said cylinder housing defining a chamber with an upper part (31) having a first diameter, the piston having a piston head (34) which is in contacting relationship with the walls of the upper chamber part (31), the first and second pressure medium inlets (38,39) connecting to the upper chamber part (31) above and below the piston head (34), respectively, and a lower chamber part (32) comprising a height adjustment means that is axially displaceable in the cylinder housing (30), the height adjustment means (40) having a bore with a diameter smaller than the diameter of the upper chamber part (31), the piston comprising a stem (35) slidably seated in the bore of the height adjustment means (40) along flexible seals (42) at the perimeter of the bore, the valve pin (11) being guided through a bore (17) in the base member (14) and through the bore of the height adjustment means (40), the base member comprising a cooling channel (18) located below the cylinder (15).
Cylinder assembly (14,15) comprising a cylinder housing (30) having a first and second pressure medium inlet (38,39), and a piston (33) reciprocatable in the cylinder housing (30), the piston (33) being coupled to the valve pin (11), characterised in that the cylinder housing (30) is detachably coupled to a base member (14) and defining a chamber with an upper part (31) having a first diameter, the piston (33) having a piston head (34) which is in contacting relationship with the walls of the upper chamber part (31), the first and second pressure medium inlets (38,39) connecting to the upper chamber part above and below the piston head (34), respectively, and a lower chamber part (32) comprising a height adjustment means (40) that is axially displaceable in the cylinder housing, the height adjustment means having a bore with a second diameter smaller than the diameter of the upper chamber part (31), the piston comprising a stem (35) being slidably seated in the bore of the height adjustment means (40) along flexible seals (42) at the perimeter of the bore, the valve pin (11) being guided through a bore (17) in the base member and through the bore of the height adjustment means (40), the base member comprising a cooling channel (18) located below the cylinder (15).
Dependencies are inferred from the claim text.