The dual-column, four-station backflush screen changer employs a parallel dual-plunger structure, achieving four-channel switching via hydraulic drive. Core components include:

Filter Unit: Multi-layer sintered metal mesh filters with pressure resistance up to 35MPa

Directional Valve Assembly: Equipped with high-precision servo valves

Backflush System: Independently designed reverse flow channels utilizing the Venturi effect to enhance flushing efficiency

Workflow

① Filtration Phase: Melt passes through A/B column main channels over filter screens, achieving >99.7% impurity retention

② Switch Preparation: Pressure sensors monitor differential pressure (threshold typically set at 0.5-0.8MPa)

③ Backflush Initiation: Standby station activates, rapid plunger switching triggers high-pressure backflush (0.6-1.2MPa)

④ Residue Removal: Specially designed scraping rings rotate synchronously to prevent dead zone material buildup

Technical Advantages

Continuous Production: Four-station rotation design enables zero-downtime screen changes

Energy-Efficient Design: Backflush energy consumption is only 40% of traditional methods

Intelligent Control: Equipped with PLC + industrial IoT modules, supporting remote diagnostics and predictive maintenance