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2. Structure Characteristics and Working Principle
2.1 Working Principle
Solenoid valve
Level switch
Liquid-level
window
Heater
Cooler
To mould
Ball valve (oil)
Ball valve(oil)
Ball valve
Ball valve
From mould
Cooling water outlet
Filter
Cooling water inlet
Oil outlet
Mould
EGO
By pass
Oil tank
Pump
Pressure
meter
Thermal
sensor
Picture 2-1：Working Principle
The high temperature oil returns to the machine and then be pressured by
pump to the heater. After being heated, oil will be forced to the mould and
continue the circle. In the process, if the oil temperature is too high, system will
activate the solenoid valve to let cooling water cool down high temperature oil
indirectly until the temperature is down to the system requirement. If the
temperature keeps increasing and reaches to the set point of EGO, the system
will sound alarm and stop operation. The system will have low level alarm and
stop working if oil level falls down below the set point.
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