Hydraulic control of hydraulic system of injection molding machine
a. The hydraulic control of the hydraulic system of the injection molding machine is the same as the hydraulic transmission. The system also includes power components, control components and actuating components, and also transmits power through oil.
b. The hydraulic transmission system uses on-off or logic control elements. For its control purpose, it is to maintain the stability of the set value or simply change the direction, also known as the set value and sequence control elements.
c. The hydraulic control system uses servo control elements, which have a feedback structure and are controlled by electrical devices. It has high control accuracy and response speed, and the pressure and flow controlled are constantly changing. The output power can be amplified.
d. Proportional control is a kind of control between the above two. The proportional control valve used is an electro-hydraulic control element developed on the basis of on-off control element and servo control element. It has some characteristics of the above two types of elements. It is used in situations where the on-off control by hand cannot meet the requirements, but it does not require the servo valve to control the pollution of the hydraulic system as strictly.
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