The invention relates to an extruder protection device and a protection method for a plastic film recycling system, including a main extruder protection unit, a feeder protection unit and an intelligent protection unit. The main extruder protection unit comprises a frequency converter V1, circuit breakers QF1, QF2, QF3 and an intelligent ammeter PA1. The incoming ends of QF1, QF2 and QF3 are respectively connected to three-phase lines A, B and C of the power grid, and the outgoing ends are connected to the inlet of frequency converter V1 through reactors L1, L2 and L3. The outlet of V1 is connected to the main extruder. The inlet of PA1 is connected to phase A through QF4, and the outlet is connected to the neutral line N. A current transformer T1 is connected in series on the circuit between QF3 and L3, and two terminals of T1 are connected to the coil of PA1. The present invention reduces extruder failure rate and maintenance cost.
Area Code: CN
Application Number: CN201710582901.X
