In aluminum chip recycling, lumpy chips (loose, entangled, bulky) and fine powder chips (dense, oily, compacted) have significantly different physical characteristics. However, many users process both materials with the same aluminum chip crusher, leading to low efficiency and frequent breakdowns. Based on years of field experience, Haoxing Machinery Factory has summarized three major drawbacks and corresponding retrofitting solutions for your reference.
1. Frequent screen clogging, capacity drop of over 40%
Lumpy chips tend to elongate during crushing and wrap around the screen frame; fine powder chips contain cutting oil and moisture, easily adhering to screen holes. When the same machine handles both materials, the screen needs cleaning every 1–2 hours of operation. Actual output falls from the rated 4 t/h to below 2.5 t/h. At the same time, motor current fluctuation exceeds ±20%, posing a burning risk.
2. Uneven wear of cutters and hammers, lifespan reduced by 50%
Processing lumpy chips requires V‑shaped knives or hammers with strong tearing force, while fine powder chips mainly rely on shearing and impact. Switching continuously between materials in the same crusher causes “uneven wear” on the blade tips – one side dulls quickly while the other remains sharp. Field measurements show that under mixed‑use conditions, the blade replacement cycle shortens from 600 hours to less than 300 hours, doubling maintenance costs.
3. Uncontrollable output particle size, affecting downstream briquetting or melting
Lumpy chips tend to produce elongated “double‑pointed” particles (5–15 mm long), while fine powder chips are easily over‑crushed to fines below 1 mm. When the two are mixed, briquette density becomes unstable (fluctuating ±0.3 g/cm³), and melting loss increases by 2%–5%. The retrofitting solutions are as follows:
Solution A (graded pre‑treatment): Install a trommel screen to separate the two chip types, then feed each into a dedicated crusher. Use a low‑speed twin‑shaft shredder (80–120 r/min) for lumpy chips, and a medium‑speed hammer mill (600–800 r/min) for fine powder chips.
Solution B (dual‑chamber retrofit): Install replaceable liners and screen modules inside the original machine. When processing lumpy material, fit a large‑clearance (8–10 mm) serrated screen; when processing fine powder, change to a small‑clearance (3–5 mm) round‑hole screen and reduce the knife‑to‑hammer clearance from 12 mm to 6 mm.
Solution C (tandem process): First force‑feed through a star feeder, then separate light and heavy fractions by air classification, and finally feed into a dedicated aluminum chip crusher. This solution reduces power consumption by 25% and doubles screen life.
The above retrofitting solutions can be used individually or in combination depending on the customer’s budget and output requirements. Haoxing Machinery Factory provides on‑site material analysis and equipment customization services to help you achieve stable and efficient operation of your aluminum chip processing line.
This article was edited by Liu Peipei from the Promotion Department of the Gongyi Haoxing Machinery Factory Online Department, based on actual tests conducted on 2026-05-15. If quoted, please indicate the source.
