The invention provides a bending
machine hydraulic synchronous
system controlled by a flow distributing and collecting valve. The bending
machine hydraulic synchronous
system comprises an
oil tank, a filter, a
hydraulic pump, a motor, a one-way valve, a
pilot-operated overflow valve, a two-position two-way solenoid
directional valve, a three-position four-way solenoid
directional valve, the flow distributing and collecting valve, a one-way speed regulating valve and hydraulic cylinders. When the hydraulic cylinders of the bending
machine are in a pressing fast-feeding state or a pressing work-feeding state, after 2DT power-on pull-in, the left position of the three-position four-way solenoid
directional valve is connected, under the action of the
hydraulic pump, hydraulic oil enters the flow distributing and collecting valve through the one-way valve and the three-position four-way solenoid directional valve and enters rodless cavities of the hydraulic cylinders with flow equally divided. When the hydraulic cylinders are in a fast return
stroke state, after 3DT power-on pull-in, the right position of the three-position four-way solenoid directional valve is connected, and the hydraulic oil in the rodless cavities enters the flow distributing and collecting valve and flows back to the
oil tank through a flow collecting valve in an equal flow mode. Flow distributing and collecting functions are respectively achieved in the two directions of an oil path of the hydraulic
system of the bending machine, so that synchronous operation of the two hydraulic cylinders in the work-feeding state or the return
stroke state is effectively ensured, and synchronization precision is high.