Mining Screen Panel Casting Line Upgrade in China

Illustration notice. Process illustrations are not verified photographs of this installation.

Project reference basis. Figures and configuration details are reported in the supplied project brief. They are reference values for the stated application, rather than verified acceptance results or a guarantee for another installation. Confirm the source records, material, tooling, operating schedule and test method when assessing a comparable project.

A tier-one mineral processing equipment manufacturer in Central China partnered with Haifeng to upgrade its polyurethane vibrating screen panel manufacturing operations. The project involved replacing labor-intensive manual gravity pouring tables with an automated, 18-station rotary vacuum-assisted cast polyurethane (CPU) cell.

Prior to the modernization, the plant experienced high rejection rates due to microscopic voids forming in the narrow 0.5 mm aperture ribs of fine-mesh dewatering screens. Under aggressive mineral slurry impact and continuous high-frequency vibration, these structural voids caused premature fatigue fracturing, pulling overall first-pass yields down to 87.2% and capping single-mold cycle times at 30 minutes.

Haifeng deployed a high-precision casting cell centered on the HF-CPU200-VS vacuum-assisted dispensing machine integrated with an automated 18-station rotary mold indexing line. Featuring tool evacuation down to -0.09 MPa and stepped-rate servo flow delivery, the upgraded facility achieved void-free rib consolidation, elevating first-pass acceptance to 99.4% while dramatically compressing cycle times.

Possible overlap with the earlier mining-screen draft (Project 1861). Both briefs quote 99.4% yield, an 87.2% baseline and 1.8× wear life, while the model and line configuration differ. Confirm project identity before merging records or public use.

Haifeng engineered an automated closed-loop production cell comprising chemical conditioning, robotic mold evacuation, and rotary indexing. PTMEG prepolymer and aromatic diamine crosslinkers are maintained in dual 150 L oil-jacketed vessels under continuous 0.08 kPa thin-film vacuum degassing to eliminate entrained moisture.

The chemical components are metered via servo-driven gear pumps paired with Coriolis mass flow meters. Before injection, the carrier mold containing an internal steel reinforcing grid enters the dispensing station on an 18-station heated turntable. A pneumatic vacuum clamp engages the tool sprue, drawing cavity pressure down to -0.09 MPa.

The mixing head executes an automated stepped dispensing profile, initially delivering 15 kg/min to flood the distribution channels before throttling to 4 kg/min to fill delicate rib slots smoothly without turbulence. An auxiliary tertiary injector adds micro-dosed catalyst into the mixing chamber during the final two seconds of the shot. The filled tool travels through a 100°C closed curing tunnel, achieving demolding strength in 9 minutes before automated pin ejection.