Structural Composition

Grinding-head assembly includes spindle unit, rotating hard-alloy grinding disc, stationary grinding disc, grinding-chamber liners, base cavity housing, spindle mechanical-seal and cooling jacket.

• All material-contact components are 316L stainless-steel; grinding-disc working-surfaces feature hard-alloy hard-facing.

• Rotating grinding-disc is fixed to spindle upper end and rotates at high-speed together with spindle; stationary-disc and liners are fastened onto cavity housing.

• Spindle end is fitted with dedicated powder-service mechanical-seal, preventing starch-dust ingress into bearings. Optional water-cooling jacket controls grinding temperature rise and inhibits starch gelatinisation.

Working Principle

Modified-starch is fed into grinding-head centre by feed-screw conveyor. High-speed-rotating grinding-disc generates strong centrifugal force throwing material into inter-tooth gaps between the rotating and stationary grinding discs. Ultrafine comminution is achieved via impact, shearing and inter-particle collision. Pulverized powder is carried upward by rising airflow into classifier-wheel for classification. Coarse particles fall back into grinding-zone for repeated re-grinding. Finished-product particle-size is adjusted by changing grinding-disc clearance and main-unit rotational speed.

Main Functions

1. Performs dry-type ultrafine pulverization for modified-starch, acting as core working unit of main mill.

2. Chamber liners protect outer housing; hard-alloy grinding-disc delivers highly wear-resistant comminution working surfaces.

3. Equipped with mechanical-seal for powder isolation; protects spindle bearings and prevents dust leakage.

4. Cavity-cooling construction limits grinding-process temperature rise and avoids heat-induced starch gelatinisation and caking.

5. Modular layout facilitates disassembly and replacement of consumable parts including grinding discs and liners.