What are the working characteristics of electromagnetic directional valve of injection molding machine?
Electromagnet for electricity and power absorption separation movement by the force of promoting the reversing valve slide around the inner core, so as to change the hydraulic oil flow direction, the purpose of the commutator is called electromagnetic directional valve.Electromagnetism action, it is the signal action that press stroke switch, pressure relay or button switch.This method is easy to realize remote operation and program automation control.
Electromagnets are controlled by alternating current. The voltage is 220V and the frequency is 50Hz.Ac control electromagnet, electromagnet starting force big, quick reversing, time is short, but the working reliability of the poor, when overloading or stuck valve core is easy to burn out, the impact of the directional movement is bigger.When the electromagnet is controlled by direct current, the voltage is 24V.This kind of electromagnet with direct current control, the structure volume is small, the impact force is small when working, the action is accurate and reliable, the service life is long, appear when overload phenomenon is not easy to damage.But this kind of electromagnet start power is small, commutation action is a bit slower, the cost is higher also.
When selecting the solenoid directional valve, attention should be paid to the effect of electromagnet thrust on hydraulic oil flow change.Medium and low pressure series solenoid directional valve, hydraulic oil flow should not be greater than 63L/min;High pressure series solenoid directional valve, hydraulic oil flow should not exceed 30DL/min.If the hydraulic fluid flow in hydraulic transmission is large, the hydraulic directional valve or electro-hydraulic directional valve can be used.