Hydraulic system in an injection molding machine

Details Hydraulic system in an injection molding machine Hydraulic system in an injection molding machine

1991-06-07

1992-07-14

Hoag, Willard

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

4254501, 4254512, 425590, 425595, B29C 4568, B29C 4576, B29C 4582

Patent

active

051298066

ABSTRACT:
The hydraulic system comprises a 4/4-way valve, which is adapted to control the velocity of the mold-closing operation and the fluid pressure during said mold-closing movement and to assume three consecutive control positions, in each of which fluid pressure is applied to a stationary piston of an advance-retract cylinder from a first cylinder chamber, which is nearer to the mold. One of said control positions is a differential control position, in which pressure fluid displaced from the second cylinder chamber of said advance-retract cylinder, which second chamber is remote from the mold, is supplied to a pressure conduit through a branch passage, which includes a non-return valve. The differential control position is preceded and succeeded by a transitional control position, in which the pressure fluid displaced from the second cylinder chamber is returned through the 4/4-way valve to a reservoir. As a result of that arrangement the production rate of the injection molding machine can considerably be increased whereas only gradual velocity and pressure chambers are effected during the mold-closing movement.

REFERENCES:
patent: 3677685 (1972-07-01), Aoki
patent: 4380427 (1983-04-01), Hehl
patent: 4565116 (1986-01-01), Hehl
patent: 4846664 (1989-07-01), Hehl
patent: 4981426 (1991-01-01), Aoki
patent: 5052910 (1991-10-01), Hehl

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