Vertical Shaft Impactors
Shaping crushers that accelerate feed against anvils or against itself to correct particle shape and produce manufactured sand. Used to fix flakiness, not to achieve reduction.
Features
- Rock-on-anvil configuration gives more reduction and shaping; rock-on-rock gives less wear cost and a slightly coarser product.
- Tip speed is the main control: raising it improves shape and fines production and increases wear proportionally.
- Cascade feed, bypassing part of the feed around the rotor, adjusts the fines-to-shape balance without changing tip speed.
- Used as a tertiary or quaternary machine, so feed has to be tightly graded before it enters.
- Wear parts are the dominant running cost, and they are specified against feed abrasiveness rather than throughput.
Specifications
| Figure | Typical range | Unit | Why it matters |
|---|---|---|---|
| Maximum feed size | 35 - 60 | mm | Feed has to be tightly graded; oversize damages the rotor. |
| Rotor tip speed | 45 - 80 | m/s | Main control on product shape and fines generation. |
| Configuration | rock-on-rock / rock-on-anvil | Trades wear cost against reduction and shaping. | |
| Throughput | 60 - 350 | t/h | Depends heavily on cascade split and target product. |