Overview
The PMD European trapezium mill is a new-generation pendulum mill that replaces the conventional reducer-and-gearbox transmission with a permanent-magnet direct-drive (PMD) motor. It produces 80-400 mesh fine powder at 6-55 t/h from a maximum feed size of 50 mm. Because the mechanical transmission stage is removed, the PMD design delivers a more direct and stable power output, has fewer wearing transmission parts and consumes less energy overall - typically about 15% less than an equivalent conventional arrangement, and up to 30% more energy-efficient than a traditional Raymond mill of similar duty.
Features
1. Permanent-magnet direct drive
The motor drives the grinding spindle directly, so there is no gearbox or belt stage to lose energy or wear out. Power output is strong and stable, overall energy saving is around 15%, and transmission components last longer.
2. Online lubrication - continuous operation
An intelligent lubrication system serves the classifier, the main unit and all motors, so lubrication can be topped up while the mill is running. Plants can keep producing without stopping for lubrication maintenance.
3. New-generation classifier
The redesigned classifier improves both sealing and airflow characteristics, raising classification efficiency and precision and making it easier to hold a consistent finished-product fineness.
4. High-performance fan
The new fan lifts pneumatic efficiency by roughly 15% and cuts fan power consumption by about 8-10% versus a conventional fan.
5. Adjustable finished fineness
Finished fineness can be set anywhere between 1.6 mm and 0.038 mm (about 325 mesh) via the variable-frequency separator.
Working Principle
Material qualified after crushing is conveyed uniformly, quantitatively and continuously into the grinding chamber of the main unit by a variable-frequency belt feeder. The ground material is carried by the fan airflow to the classifier for particle-size classification. Material that does not meet the fineness requirement falls back into the grinding chamber for re-grinding, while the qualified powder is carried through the pipeline into the cyclone powder collector for gas-solid separation and collection, and is finally discharged through the discharge mechanism as finished product. The separated air returns to the fan through the return-air pipe at the top of the cyclone powder collector, forming a closed-loop airflow circuit. The entire system operates under negative pressure and is equipped with a pulse dust collector, with all emission indicators complying with the relevant national environmental protection standards.
