What is the Practical Sub-5 mm Passing Range I Can Expect on My Material?

On brittle low-abrasion materials (gypsum, soft limestone, coal), the passing percentage reaches the upper end of the 60–90% range at maximum spindle speed. On harder or more irregular feed (denser limestone, clinker with high alkali content), the passing percentage tends toward the lower end of the range. We recommend providing a representative material sample for […]

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How Does the PLF Compound Crusher Differ from a Standard Vsi Sand Maker?

VSI sand makers use high-speed impact in an open rotor design and are optimised for cubical particle shape and broad capacity range on hard, abrasive feed. The PLF adds inter-particle grinding in a closed annular chamber to concentrate the output in the sub-5 mm range – producing a higher passing percentage at the same throughput on […]

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Is this Machine Suitable for Wet or Sticky Feed?

The fine crusher handles moderate moisture (up to 8%) on most materials without significant performance loss. Wet cement clinker or sticky clay-bound limestone can build up in the nip zone and on the roll surfaces, reducing compression efficiency and requiring more frequent cleaning. Scraper blades on the roll surfaces mitigate build-up. For consistently wet or […]

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What Causes Premature Roll Surface Wear and How is it Repaired?

Premature wear is caused by feeding oversized material above the rated maximum, highly abrasive feed beyond the design hardness, or running the gap too tight for the feed size (high contact stress on uncrushable particles). Roll surfaces are restored by hardfacing weld – depositing wear-resistant alloy on the worn surface and grinding back to profile. Hardfacing […]

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Can the Discharge Gap be Adjusted While The Machine is Running?

No – discharge gap adjustment requires the machine to be stopped and the drive isolated. Adjustment is made via the gap setting mechanism on the floating roll housing. Always confirm the gap is equal at both ends of the roll (parallel) before restarting. Plan gap changes during scheduled maintenance windows; the adjustment itself takes 10–20 minutes.

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How Does The Fine Crusher Compare to a Vsi Sand Maker for Producing Sub-5 Mm Product?

VSI sand makers use high-velocity impact and are well suited to hard, abrasive materials (granite, river pebble, quartzite) where impact fracture is more energy-efficient than compression. The fine crusher uses low-speed compression and is better suited to soft-to-medium brittle materials (clinker, limestone, glass) where compression fracture produces the same sub-5 mm output at lower wear […]

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Can the Double Roller Crusher Handle Wet or Sticky feed?

Moderate moisture content (up to 8–12%) is handled without significant performance loss on most materials. Wet, sticky clay-bound feed can accumulate on the roll surfaces and in the nip zone, reducing effective compression and causing roll slip. For high-moisture or sticky feed, scraper blades on the roll surfaces help prevent build-up. Discuss feed moisture and […]

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How Long do the Roll Surfaces Last and How are They Repaired?

Roll surface life depends on material abrasiveness. On coal, roll surfaces typically last 1,500–3,000 hours before requiring resurfacing. On limestone, 800–1,500 hours is typical. Roll surfaces can be restored by hardfacing weld – depositing wear-resistant alloy onto the worn surface and re-profiling to the original diameter. Hardfacing is significantly more cost-effective than full roll replacement and […]

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What is the Correct Method for Adjusting the Roll Gap?

The roll gap is adjusted by repositioning the floating roll bearing housings relative to the frame, against the spring pre-load. On most 2PGY models, a hand-wheel or adjusting bolt moves the floating roll; a gap gauge confirms the set distance. Always stop the machine and isolate the drive before measuring or adjusting the gap – the […]

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