The invention discloses a two-platen hydraulic
injection molding machine with normal pressure, boosted pressure and
high pressure mold clamping circuit, including a mold clamping
hydraulic cylinder, a booster
hydraulic cylinder, a two-position three-way
reversing valve, and a two-position two-way
reversing valve of the mold clamping oil circuit And clamping oil circuit
check valve, characterized in that: the pressure oil
pipe is connected to the pressure side oil port P of the three-position four-way
reversing valve through the first
branch pressure oil
pipe, and the right end of the three-position four-way reversing valve The side oil port A is connected to the oil port of the rodless chamber of the large oil cylinder of the pressurized
hydraulic cylinder; the upper oil port B on the left end of the three-position four-way reversing valve is connected with the rod chamber of the small oil cylinder of the pressurized hydraulic cylinder through a connecting oil
pipe At the same time, the oil port B on the left end of the three-position four-way reversing valve is also communicated with the rodless cavity of the small oil cylinder of the pressurized hydraulic cylinder through the second
branch oil pipe. This circuit is simple in structure, easy to operate, and has two functions of normal pressure mold clamping and
high pressure mold clamping. It can not only realize mold clamping, but also slow down the
impact buffer on the contact surface of the mold through normal pressure mold clamping, so as to achieve the
initial stability of the mold clamping process. Require.