Impact Crushers
Turn Limestone and C&D Waste into High-Value Cubical Aggregate
One machine. Two stages. Spec-grade product straight off the belt.
ASTON impact crushers are built for producers who get paid by the shape of their stone—not just the tonnage. With a high reduction ratio of up to 30:1, our PF and PFW series can replace a secondary cone in many limestone, dolomite, and recycled concrete applications, taking feed sizes up to 800 mm and delivering well-graded 0–5, 5–10, and 10–20 mm cubical aggregate that meets EN, ASTM, and GB standards for concrete and asphalt mixes.
Hydraulic gap adjustment lets your operator reset the discharge size in minutes, not hours. Heavy-duty chrome-molybdenum blow bars and a hard-faced impact apron are engineered for 30–40% longer service life on abrasive feeds, while the over-center hydraulic opening cuts blow bar changeout to a single shift.
Choose a stationary PF/PFW unit for fixed quarry and cement plant lines, or a track-mounted mobile impactor that moves with your demolition site and feeds directly from the excavator.
More sellable fines. Fewer wear part orders. Faster ROI per ton.
Exlpore our impact crusher solutions
Stationary impact crusher
PF series / LF series
Capacity range: 15-800t/h
Mobile impact crusher
Wheel type / Crawler type
Capacity range: 100-500t/h
Materials processed by impact crushers
For secondary & tertiary crushing of medium-hard, low-abrasion materials and recyclables
Natural minerals
Limestone
Marble
Dolomite
Gypsum
Shale
Coal / Coal gangue
Recyclables & by-products
Recycled concrete
Asphalt pavement
Brick & tile waste
Construction & demolition waste C&D
Slag
Sandstone
Key benefits of Aston impact crusher for sale
Cubical product, Spec-Grade Output
Engineered for shape, not just size. ASTON impact crushers deliver a high cubical particle ratio and well-graded 0–5, 5–10, and 10–20 mm fractions that meet EN, ASTM, and GB standards for ready-mix concrete and asphalt — turning your output into premium-priced aggregate, not low-margin filler.
Lower wear cost, faster changeouts
High-chrome and chrome-molybdenum blow bars deliver 30–40% longer service life on limestone and recycled concrete. The over-center hydraulic housing opens in minutes, letting a single operator complete a full blow bar swap in one shift — not a full day of downtime.
One machine, two crushing stages
With a reduction ratio of up to 30:1, ASTON impact crushers can take feed sizes up to 800 mm and produce finished aggregate in a single pass — replacing a separate secondary cone in many limestone and C&D recycling lines. Available as stationary PF/PFW units for fixed plants, or track-mounted mobile impactors that feed directly from the excavator on demolition sites.
Aston impact crusher for sale
ASTON offers a complete range of impact crushers for secondary and tertiary crushing of medium-hard, low-abrasion materials and recyclables. From standard PF/PFV units for cement and aggregate plants to European-style LF heavy-duty impactors for super-large reduction ratios, plus tyre-mounted and crawler-mounted mobile stations for on-site recycling — every configuration is engineered for cubical product shape, low wear cost, and continuous heavy-duty operation in limestone quarries, cement lines, and C&D recycling sites.
Stationary impact crusher
PF/PFV series impact crusher
Feeding size: ≤800mm
Finished products size: 400-1260mm
Capacity: 15-800t/h
The proven workhorse for fixed crushing lines. PF (two-chamber) and PFV (three-chamber) impactors handle feed sizes up to 800 mm and compressive strength up to 250 MPa, processing limestone, dolomite, and recycled concrete with capacities from 15 to 800 t/h. High-chromium blow bars, keyless rotor connection, and an adjustable impact apron deliver consistently cubical product — ideal for cement plants, aggregate quarries, and ready-mix supply lines.
Best for: Limestone & cement plant crushing lines, mid-to-large aggregate quarries
Specifications of PF series impact crusher
| Model | Specification | Feed Opening Size (mm) | Feeding Size (mm) | Capacity (t/h) | Motor Power (kw) | Overall Dimension(mm) | |
| PF-1007 | Φ1000 × 700 | 400 x 730 | ≤250 | 15-60 | 45 | 2319 x 1654 x 2558 | |
| PF-1010 | Φ1000 × 1050 | 400 x 1080 | ≤300 | 50-90 | 55 | 2319 x 2001 x 2558 | |
| PF-1210 | Φ1250 × 1050 | 450 x 1060 | ≤300 | 80-150 | 90 | 2585 x 2053 x 2809 | |
| PFV-1214 | Φ1250 × 1400 | 450 x 1440 | ≤300 | 100-200 | 132 | 2582 x 2403 x 2809 | |
| PFV-1315 | Φ1320 × 1500 | 550 x 1530 | ≤350 | 130-280 | 200 | 2930 x 2761 x 3053 | |
| PFV-1320 | Φ1320 × 2000 | 610 x 1900 | ≤500 | 180-400 | 280 | 3224 x 3175 x 2706 | |
| PFV-1520 | Φ1500 × 2000 | 830 x 2040 | ≤700 | 300-550 | (220-250)x2 | 3959 x 3564 x 3330 | |
| PFV-1820 | Φ1800 × 2000 | 1260 x 2040 | ≤800 | 600-800 | 630-710 | 4400 x 3866 x 4009 |
LF Series European impact crusher
Feeding size: ≤1950mm
Max input size: ≤900mm
Capacity: 100-580t/h
Engineered to replace a two-stage jaw + impactor process with a single super-high-reduction machine. The LF series accepts feed up to 900 mm and material strength up to 360 MPa, with a curved crushing chamber, sawtooth liners, and a hydraulic-opening housing that cuts maintenance from 8 hours down to 30 minutes. Modular wear parts deliver 75%+ liner utilization and 1.5× longer service life — built for producers who run 24/7 and measure cost in dollars per ton.
Best for: High-volume aggregate producers, harder limestone, granite shaping (3rd stage)
Specifications of LF series impact crusher
| Model | Feeder Opening Size (mm) | Max Input Size (mm) | Processing Capacity (t/h) | Power (kw) | Weight (kg) |
| LF150 | 820×980 | ≤500 | 100-200 | 90-200 | 12000 |
| LF250 | 960×1360 | ≤700 | 200-400 | 180-250 | 17000 |
| LF350 | 1050×1700 | ≤800 | 300-500 | 200-400 | 24000 |
| LF450 | 1350×1950 | ≤900 | 350-580 | 220-440 | 29600 |
Stationary impact crusher on-site operation:
Mobile impact crusher
Mobile wheel type impact crusher
Capacity: 80-400t/h
Deployment: Road-towable, no foundation required
A road-towable crushing line that carries an LF-series impactor, vibrating feeder, and main belt on a single chassis. Deploys to a new site in hours — no foundation, no assembly. With capacities from 80 to 400 t/h and configurations from K3-LF150-2C to K3-LF350-2C, this unit is built for contractors moving between projects: urban demolition, road rehabilitation, and short-term aggregate jobs where renting beats building a fixed plant.
Best for: Multi-site contractors, road & bridge construction, rented crushing service
Specification of mobile wheel type impact crushers
| Model | K3-LF150-2C | K3-LF250-2C | K3-LF350-2C |
| Vibrating feeder | GZD9638 | GZD1142 | ZSW1349 |
| Impact crusher | LF150 | LF250 | LF350 |
| Main belt | B800 | B1000 | B1200 |
| Capacity(t/h) | 80-120 | 150-300 | 200-400 |
Mobile crawler impact crusher
Capacity: 100-500t/h
Mobility: Hydraulic crawler, all-terrain
The fully hydraulic, self-propelled answer to on-site C&D recycling. With tracked undercarriage, the crawler impact plant moves directly across demolition sites, rough quarry floors, and unprepared ground — feeding straight from the excavator with no trucking in between. Three models (TF150 / TF250 / TF350) cover 100–500 t/h with feed sizes up to 800 mm, and an integrated return screen delivers finished, spec-grade aggregate in a single pass.
Best for: On-site C&D recycling, urban demolition, off-road quarry operations
Specification of mobile crawler type impact crushers
| Model | LF150 | LF250 | LF350 |
| Maximum feeding size | 500mm | 700mm | 800mm |
| Capacity | 100-200t/h | 200-400t/h | 300-500t/h |
| Motor Power | 90-200KW | 180-250KW | 200-400KW |
| Return screen | |||
| Model | 2YK1530 | 2YK1640 | YS1740 |
| Drive method | Vibration motor 3.7KW*2 | Vibration motor 3.7KW*2 | Vibration motor 5.5KW*2 |
| Power system | |||
| Generator | 360KW | 500KW | 520KW |
Mobile impact crushing plant on-site operation:
Compare stationary and mobile impact crushers
Stationary impact crusher
Mobile impact crusher
Installation method
Fixed installation on a concrete foundation, integrated into a permanent crushing and screening line.
Mounted on a tyre chassis or hydraulic crawler undercarriage, with feeder, crusher, and discharge belt on a single self-contained frame.
Mobility
Designed for long-term, fixed-site operation; relocation requires disassembly and re-foundation.
Road-towable between sites; crawler-mounted units self-propel across the work area and reposition with the feed face.
Site requirements
Requires prepared concrete foundation, electrical hookup, and integrated screening/conveying infrastructure.
Minimal civil work; operates on compacted ground or directly on demolition sites with no foundation needed.
Production stability
Ideal for continuous, high-tonnage production lines with consistent feed and stable power supply.
Optimized for variable feed and on-demand crushing; output adjusts to project size rather than running 24/7.
Typical applications
Cement plants, limestone quarries, fixed aggregate production lines, sand-and-gravel operations.
Construction & demolition recycling, road rehabilitation (RAP), urban infrastructure projects, multi-site contracting.
Materials processed
Limestone, dolomite, marble, gypsum, shale, sandstone — medium-hard, low-abrasion natural minerals.
Recycled concrete, asphalt pavement, brick and tile waste, mixed C&D debris, plus on-site crushing of soft-to-medium natural rock.
Initial investment
Lower equipment cost per ton at scale, but requires civil construction, foundation, and plant integration.
Higher equipment cost, but eliminates foundation expense, trucking fees, and tipping costs at the demolition site.
Best for
Producers running a single high-volume site for 5+ years where the feed comes to the machine.
Contractors and recyclers working multiple short-to-medium projects per year where the machine goes to the feed.
Compare stationary and mobile impact crushers
Stationary impact crusher
Installation method
Fixed installation on a concrete foundation, integrated into a permanent crushing and screening line.
Mobility
Designed for long-term, fixed-site operation; relocation requires disassembly and re-foundation.
Site requirements
Requires prepared concrete foundation, electrical hookup, and integrated screening/conveying infrastructure.
Production stability
Ideal for continuous, high-tonnage production lines with consistent feed and stable power supply.
Typical applications
Cement plants, limestone quarries, fixed aggregate production lines, sand-and-gravel operations.
Materials processed
Limestone, dolomite, marble, gypsum, shale, sandstone — medium-hard, low-abrasion natural minerals.
Initial investment
Lower equipment cost per ton at scale, but requires civil construction, foundation, and plant integration.
Best for
Producers running a single high-volume site for 5+ years where the feed comes to the machine.
Mobile impact crusher
Installation method
Mounted on a tyre chassis or hydraulic crawler undercarriage, with feeder, crusher, and discharge belt on a single self-contained frame.
Mobility
Road-towable between sites; crawler-mounted units self-propel across the work area and reposition with the feed face.
Site requirements
Minimal civil work; operates on compacted ground or directly on demolition sites with no foundation needed.
Production stability
Optimized for variable feed and on-demand crushing; output adjusts to project size rather than running 24/7.
Typical applications
Construction & demolition recycling, road rehabilitation (RAP), urban infrastructure projects, multi-site contracting.
Materials processed
Recycled concrete, asphalt pavement, brick and tile waste, mixed C&D debris, plus on-site crushing of soft-to-medium natural rock.
Initial investment
Higher equipment cost, but eliminates foundation expense, trucking fees, and tipping costs at the demolition site.
Best for
Contractors and recyclers working multiple short-to-medium projects per year where the machine goes to the feed.
Impact crusher machine features:
- Heavy-duty rotor with high inertia: A reinforced rotor body and special hammer-locking method increase rotational moment, deliver consistent impact energy, and keep blow bars firmly fixed under continuous high-load operation.
- High-chromium blow bars, keyless connection: Chrome-molybdenum blow bars deliver 30–40% longer service life on limestone and recycled concrete, while the keyless rotor connection eliminates fasteners that loosen under impact and simplifies changeouts.
- Curved crushing chamber with sawtooth liners: The arc-shaped chamber accepts larger feed sizes, while sawtooth-profile impact liners crush harder material more efficiently and extend liner service life by up to 1.5×.
- Hydraulic housing opening for fast maintenance: Over-center hydraulic opening reduces a full blow bar swap from 8 hours to 30 minutes, letting a single operator complete maintenance in one shift instead of a full day of downtime.
- Hydraulic gap adjustment for cubical product control: The constant-pressure hydraulic system lets operators reset the discharge gap in minutes, fine-tuning particle size and shape to match concrete, asphalt, or road-base specifications without stopping the line.
Impact crusher price
How much does an Aston impact crusher cost?
ASTON impact crusher prices typically range from USD 30,000 to 350,000+, depending on series, capacity, and whether the unit is stationary or mobile. Every project has different feed material, target output, and site conditions, the only way to get an accurate number is a configured quote — but the table below shows the typical price brackets our customers see.
Indicative price ranges by configuration
| Configuration | Typical Capacity | Indicative Price (USD) | Best Fit |
|---|---|---|---|
| PF / PFV stationary impactor | 15–400 t/h | 30,000–120,000 | Small-to-mid aggregate & cement plants |
| LF European stationary impactor | 100–580 t/h | 80,000–200,000 | High-volume producers replacing two-stage circuits |
| Tyre-mounted mobile plant (K3-LF) | 80–400 t/h | 150,000–280,000 | Multi-site contractors, road & bridge projects |
| Crawler-mounted mobile plant (TF) | 100–500 t/h | 220,000–350,000+ | On-site C&D recycling, off-road operations |
Why an Aston quote is worth asking for
- Engineer-configured, not template-priced. Every quote is sized against your actual feed material, target product gradation, and site layout — no generic price list.
- No middleman markup. ASTON manufactures PF, PFV, LF, K3, and TF series in-house, so quotes reflect factory cost plus a single transparent margin.
- TCO clarity. Quotes include estimated wear-part cost per ton, power consumption, and expected service life — so you can compare cost-per-ton, not just sticker price.
- Response in 24 hours. Standard configurations get a budgetary number same-day; engineered configurations within one business day.
Versatile applications for impact crushers
ASTON impact crushers are the workhorse of four high-value markets where product shape, reduction ratio, and on-site flexibility matter more than raw crushing force. Whether you’re feeding a cement kiln, supplying ready-mix plants, recycling demolition waste, or rebuilding a highway, the same crushing chamber adapts to your feed material and your spec sheet.
Cement & limestone quarries
Reduce ROM limestone from 800 mm down to kiln-feed size in a single stage. ASTON PF and LF series impactors deliver consistent 0–25 mm output for raw mix preparation and 0–5 / 5–25 mm fractions for cement aggregate, with capacities matched to plants from 1,500 to 10,000 t/day.
Typical setup: Stationary LF250 or LF350 fed by an apron feeder, integrated with a vibrating screen and return belt for closed-circuit operation.
Aggregate production for concrete & asphalt
Produce spec-grade cubical aggregate that ready-mix and asphalt plants will pay a premium for. The high cubical particle ratio and adjustable discharge gap let you hit EN, ASTM, and GB gradation requirements for 0–5, 5–10, 10–20, and 20–31.5 mm fractions — directly out of the impactor, no secondary shaping needed.
Typical setup: PF/PFV stationary unit as secondary crusher after a primary jaw, paired with a 3-deck screen for finished product separation.
Construction & demolition recycling
Turn demolition waste into saleable aggregate on the spot. Crawler-mounted TF series impactors process recycled concrete, brick, asphalt pavement (RAP), and mixed C&D debris directly at the demolition site — eliminating tipping fees of $8–15 per ton and producing road base, sub-base, or recycled concrete aggregate (RCA) ready for reuse on the same project.
Typical setup: TF250 or TF350 crawler plant fed by an excavator, with onboard magnet for rebar removal and return screen for finished gradation.
Road construction & highway rehabilitation
Move with the project. Tyre-mounted K3-LF mobile plants tow between road segments and crush milled asphalt (RAP), reclaimed base material, or fresh limestone into specification base course and surface aggregate — turning what would be hauled-off waste into reusable material kilometers ahead of the paver.
Typical setup: K3-LF250-2C tyre-mounted plant deployed alongside the milling crew, producing 150–300 t/h of RAP-blended base material on-site.
Other application areas
Beyond the four core markets above, ASTON impact crushers also serve gypsum and shale processing for building materials, coal gangue crushing for power and brick plants, slag reduction for low-abrasion industrial by-products, and glass cullet preparation for recycling lines — anywhere a medium-hard, low-abrasion feed needs to be reduced to a precise, well-shaped product.
Impact crusher machine main components
Every ASTON impact crusher is built around seven core components that work together to deliver high reduction ratios, cubical product shape, and long service life. Understanding what each part does helps you specify the right configuration — and recognize where the real engineering value sits.
The heart of the impact crusher. A heavy-duty welded rotor body with high rotational inertia carries the blow bars at speeds of 35–75 m/s, delivering the impact energy that breaks the feed material. ASTON rotors use a reinforced shaft, dynamically balanced disc design, and a special hammer-locking method that keeps blow bars firmly fixed under continuous high-load operation.
Why it matters: Higher inertia = more consistent impact energy = more uniform product gradation, even with variable feed.
The wear part that does the actual crushing. ASTON supplies high-chromium and chrome-molybdenum blow bars as standard, with optional ceramic-insert versions for abrasive feed. The keyless rotor connection eliminates fasteners that loosen under impact, and modular design allows front-and-reverse interchange — pushing effective service life 30–40% above industry average.
Why it matters: Blow bars are 60–70% of total wear cost. Longer life and faster swaps directly lower your cost per ton.
The curved plates above the rotor that deflect material back into the crushing zone for secondary impact. ASTON’s two-chamber (PF) and three-chamber (PFV) designs use hydraulically adjustable aprons, letting operators reset the gap between rotor and apron in minutes to fine-tune product size and shape without stopping the line.
Why it matters: Apron position controls particle size and cubical ratio. Hydraulic adjustment = on-spec product without manual shimming.
Replaceable side and back liners that protect the crushing chamber housing. The LF series uses sawtooth-profile liners that crush harder material more efficiently, with modular interchange that achieves 75%+ liner utilization — meaning you flip and reuse liners instead of throwing them out at 30% wear.
Why it matters: Liner cost is the second-largest OPEX item after blow bars. Modular design cuts annual liner spend nearly in half.
The over-center hydraulic system that splits the upper housing for maintenance access. A 500 kg onboard maintenance arm assists with blow bar removal, and the hydraulic opening reduces a full blow bar swap from 8 hours down to 30 minutes — a single shift instead of a full day of downtime.
Why it matters: Maintenance speed is the #1 reason customers replace older impact crushers. This is where ASTON pays for itself.
A high-torque electric motor (45–710 kW depending on model) drives the rotor through V-belts and a flywheel that smooths impact loads. Optional variable-frequency starters reduce inrush current and let operators ramp rotor speed to match feed conditions — useful for dust control and recycled-feed applications.
Why it matters: Soft-start and VFD control reduce electrical infrastructure cost and extend belt and bearing life.
A heavy-duty welded steel frame supports the rotor on oversized spherical roller bearings with forced lubrication. The frame is engineered to absorb impact loads transmitted through the rotor without resonance, and bearing housings use labyrinth seals to keep dust out of the lube system.
Why it matters: Frame rigidity and bearing protection determine the machine’s structural service life — typically 15–20 years for ASTON units.
What materials can our impact crusher process?
ASTON impact crushers are engineered for medium-hard, low-to-medium abrasion materials with compressive strength up to 350 MPa. They excel where the goal is high reduction ratio and cubical product shape — not raw force on extremely hard, abrasive rock. The guide below shows what works, what works with the right setup, and what we’ll honestly recommend a different machine for.
Ideal materials — designed for
These are the materials our PF, PFV, and LF series were built around. Expect long blow bar life, consistent product gradation, and the lowest cost per ton.
| Material | Mohs Hardness | Compressive Strength | Typical Application |
|---|---|---|---|
| Limestone | 3–4 | 50–150 MPa | Cement raw mix, aggregate, road base |
| Dolomite | 3.5–4 | 60–180 MPa | Cement, glass industry, aggregate |
| Marble | 3–5 | 70–140 MPa | Decorative aggregate, calcium carbonate |
| Gypsum | 1.5–2 | 20–40 MPa | Plasterboard, cement retarder |
| Shale | 3 | 30–80 MPa | Brick, cement clay component |
| Sandstone (low-silica) | 6–7 | 40–200 MPa | Construction aggregate, dimension stone |
Why these work: Low quartz content means blow bar wear stays predictable (1,000+ hours typical), and the impact-fracture mechanism produces 80%+ cubical particles straight off the rotor.
Recyclables & industrial by-products — purpose-fit
These materials are where the mobile crawler and tyre-mounted impactors earn their keep. Reduction ratios are high, contamination is mixed, and the value comes from turning waste into saleable product on-site.
| Material | Feed Size | Output Use |
|---|---|---|
| Recycled concrete (RCA) | up to 800 mm | Road base, sub-base, recycled aggregate concrete |
| Asphalt pavement (RAP) | up to 600 mm | Hot-mix asphalt, base course |
| Brick & tile waste | up to 500 mm | Sub-base, fill material |
| Mixed C&D debris | up to 700 mm | Road base, structural fill |
| Coal gangue | up to 500 mm | Power plant fuel, brick raw material |
| Slag (low-abrasion only) | up to 400 mm | Cement additive, road base |
Why these work: The high reduction ratio (up to 30:1) and integrated rebar/contaminant rejection on mobile units make impact crushers the only economical choice for on-site C&D recycling.
Workable with caution — specify carefully
These materials can be processed, but blow bar wear accelerates significantly. We’ll quote them, but we’ll also tell you upfront what to expect on operating cost.
| Material | The trade-off |
|---|---|
| Hard limestone (>180 MPa) | Reduced blow bar life; ceramic-insert blow bars recommended |
| Quartz sandstone (>10% free silica) | 2–3× faster wear; consider VSI or cone for tertiary stage |
| Concrete with steel rebar | Requires onboard magnet + manganese-steel blow bars |
| Wet sticky feed (>8% moisture clay) | Risk of chamber blockage; pre-screening required |
Our policy: If your project falls in this zone, we’ll size blow bar replacement frequency into the quote so there are no cost surprises.
Not recommended — choose a different machine
We don’t sell what we know won’t deliver value. For these materials, ASTON will recommend a jaw, cone, or VSI crusher instead.
| Material | Better alternative |
|---|---|
| Granite (Mohs 6–7, high silica) | Jaw + cone (primary + secondary) |
| Basalt (Mohs 6, very high silica) | Jaw + cone |
| Quartzite & quartz (Mohs 7) | Jaw + cone or VSI for shaping |
| Iron ore, copper ore, gold ore | Jaw + cone for crushing; ball/SAG for grinding |
| Pebble & river gravel (high silica) | VSI or cone crusher |
| Highly abrasive slag (blast furnace, copper) | Jaw + cone |
Why we say no: On these feeds, blow bar life can drop to under 100 hours, making cost per ton 5–10× higher than a properly specified jaw or cone setup. We’d rather lose the impact crusher sale and earn your trust on the right machine.
Not sure where your material fits?
Send us a sample analysis or a feed photo. ASTON application engineers will match your material to the right crusher type, the right wear-part package, and the right capacity — even if it means recommending a different machine in our portfolio.
Want to talk? Reach out to our experts
The critical role of impact crushers in secondary crushing
In a typical aggregate or recycling production line, the secondary crushing stage is where raw output becomes saleable product. Primary jaw crushers reduce ROM material to manageable size, but they don’t shape it, don’t grade it precisely, and don’t produce the cubical particles that concrete and asphalt buyers will pay a premium for. That’s the job of the secondary crusher — and for medium-hard, low-abrasion feed, the impact crusher is the most economical machine ever engineered for it.
Where impact crushers sit in the crushing circuit
Primary (Jaw)
ROM up to 1000 mm
Secondary (Impact)
300–800 mm
Screening
5–25 mm
Tertiary (Impact / VSI)
0–5 / 5–20 mm
In limestone and recycled-concrete operations, a single impact crusher often handles both secondary and tertiary stages in one pass — its high reduction ratio (up to 30:1) and adjustable discharge gap collapse what would normally be a two-machine circuit into a single-stage process. This is why the impact crusher is the only secondary crusher that doubles as a finishing crusher for many medium-hard feeds.
Three things only an impact crusher does well at the secondary stage
- Cubical product shape from the first pass. Cone crushers compress material between liners, producing flaky and elongated particles that fail concrete and asphalt shape specifications. Impact crushers fracture material along natural cleavage planes through high-velocity impact, producing 80%+ cubical particles straight off the rotor — no separate shaping stage needed. For ready-mix and asphalt suppliers, this single difference is worth $2–5 per ton in product premium.
- High reduction ratio in a single machine. A cone crusher typically delivers a 4:1 to 6:1 reduction ratio. An impact crusher delivers up to 30:1. That means a 600 mm feed can become 0–25 mm finished product in one stage — collapsing CAPEX, footprint, and electrical load. For greenfield aggregate plants and mobile recycling operations, this is the difference between buying one machine or three.
- Adjustable discharge for spec-grade output. The hydraulically adjustable impact apron lets operators dial in particle size to match downstream demand — 0–25 mm for road base on Monday, 0–10 mm for asphalt on Tuesday, 5–20 mm for concrete on Wednesday. No screen change, no liner swap. For producers serving multiple markets from one plant, this operational flexibility is itself a revenue lever.
When impact crushers replace a two-stage circuit
For medium-hard feed under 350 MPa compressive strength, the LF European-style impactor can replace a traditional jaw + impact two-stage process with a single super-high-reduction machine. The economics typically look like this:
| Traditional 2-stage | LF single-stage | |
|---|---|---|
| Equipment count | Jaw + Impact + 2 belts + 2 screens | LF + 1 belt + 1 screen |
| CAPEX | $250,000–400,000 | $150,000–250,000 |
| Footprint | 800–1,200 m² | 300–500 m² |
| Power consumption | 350–500 kW total | 180–280 kW |
| Maintenance points | 2 crushers, 2 motors | 1 crusher, 1 motor |
For a 200,000 t/year limestone aggregate plant, this consolidation typically saves $80,000–150,000 in CAPEX and 15–20% in OPEX over five years.
Where impact crushers don’t belong at the secondary stage
Honest answer: on hard, abrasive feed, cones still win. Granite, basalt, quartzite, and most metallic ores are best handled by a jaw + cone secondary circuit, where blow bar consumption would otherwise cripple the economics. The impact crusher’s place in the circuit is specifically:
- Limestone, dolomite, marble (cement and aggregate) — secondary or single-stage
- Recycled concrete, asphalt, C&D waste — primary, secondary, or single-stage on mobile units
- Soft to medium sandstone, gypsum, shale — secondary
If your feed is medium-hard and low-abrasion, putting an impact crusher at the secondary stage is the single most important specification decision in your circuit. It determines product shape, product grade, plant footprint, capital cost, and ultimately your selling price per ton of finished aggregate. Done right, it’s the machine that pays for itself fastest in the entire crushing chain.
About aston machine
Setting new standards in crushing efficiency.
Our technological edge lies in multi-cylinder hydraulic designs and highly optimized crushing cavities. By automatically adapting to load variations and maximizing rock-on-rock crushing action, ASTON systems guarantee superior reduction ratios, minimizing the need for secondary processing stages.
Working process of impact crusher
ASTON impact crushers reduce raw material to spec-grade aggregate in five continuous stages, all happening in fractions of a second inside the crushing chamber. Click each stage to see how impact energy converts feed into cubical product — and where the engineering details determine your output quality.
Material enters the crushing chamber and meets the rotor at high velocity.
Raw feed (up to 800 mm depending on model) is delivered into the upper inlet by a vibrating feeder or apron feeder, falling under gravity into the path of the rotating blow bars. The rotor spins at 35–75 m/s tip speed, driven by a heavy-duty electric motor through V-belts and a flywheel that smooths impact loads.
The feed inlet geometry is engineered to deliver material into the center of the impact zone rather than the edges — concentrating energy on every particle and preventing oversized chunks from bypassing the rotor.
Engineering detail: Inlet width matches the maximum feed size with a safety margin, and a feed deflector prevents material from rebounding back up the chute.
Blow bars hit the feed at 35–75 m/s, fracturing material along natural cleavage planes.
This is the moment that defines the impact crusher. As feed enters the rotation path, the chrome-alloy blow bars strike each particle with kinetic energy proportional to mass × velocity² — converting the rotor’s inertia into fracture force. Unlike compression crushing (jaw, cone), which squeezes material to failure, impact fracture follows the material’s natural weak planes, producing 80%+ cubical particles rather than flaky or elongated shapes.
The high-chromium or chrome-molybdenum blow bars absorb this impact thousands of times per minute. ASTON’s keyless rotor connection and special hammer-locking method keep blow bars firmly fixed under continuous high-load operation, with no fasteners that loosen over time.
Engineering detail: Rotor inertia (rotational moment) is sized to maintain consistent tip speed even when large feed enters — preventing rotor stall and uneven product gradation.
Material rebounds off curved impact aprons and re-enters the rotor zone for a second strike.
Particles thrown by the blow bars at high velocity collide with the curved impact aprons mounted above and behind the rotor. This collision delivers a second round of fracture energy, and the curved geometry redirects rebounded material back into the rotor path for a third or even fourth impact cycle.
This re-circulation inside the chamber is what gives impact crushers their high reduction ratio of up to 30:1 — far beyond what a single-pass crusher can achieve. PF series uses two impact chambers; PFV series adds a third chamber for finer output and tighter gradation control.
Engineering detail: The arc-shaped apron design (LF series) creates a larger crushing cavity and more rebound paths than flat aprons, meeting the reduction needs of harder material with longer service life.
Adjustable gap between rotor and apron determines final product size.
Material continues to bounce between rotor and aprons until it reaches a size small enough to pass through the gap between the bottom of the lowest apron and the rotor circle. This gap is the single most important variable for product gradation — wider gap means coarser product, narrower gap means finer product.
ASTON impactors use a constant-pressure hydraulic adjustment system that lets operators reset the gap from the control panel in minutes. No manual shimming, no chamber entry, no production stop. For producers serving multiple markets from one plant, this means switching from 0–25 mm road base to 0–10 mm asphalt aggregate in real time.
Engineering detail: A spring-loaded safety apron rear-section retracts if uncrushable material (e.g., tramp metal) enters the chamber, then automatically resets to the operator’s preset gap — protecting blow bars and rotor from catastrophic damage.
Sized product exits through the bottom; oversize is screened and returned to the rotor.
Crushed material falls out through the chamber bottom onto the discharge belt. In a typical aggregate or recycling line, the discharge belt feeds a vibrating screen, which separates the output into finished fractions (0–5, 5–10, 10–20 mm) and any oversize particles that didn’t reach spec.
Oversize is returned via a recirculation belt back to the impactor inlet for re-crushing — closing the circuit so 100% of feed eventually exits as on-spec product. Mobile crawler units (TF series) integrate this return screen and recirculation belt onto the same chassis, delivering finished aggregate from a single self-contained machine on demolition sites.
Engineering detail: Closed-circuit operation typically achieves 100% spec-grade output but adds 15–25% to circulating load. Open-circuit (no return) is faster but produces 5–15% off-spec fines that may need separate handling.
| Stage | Duration | Key Variable |
|---|---|---|
| Feeding & Acceleration | < 0.5 sec | Inlet geometry |
| Primary Impact | < 0.1 sec | Tip speed (35–75 m/s) |
| Apron Rebound (2–4 cycles) | 0.2–0.5 sec | Apron curvature |
| Discharge Sizing | continuous | Hydraulic gap setting |
| Screening & Recirculation | 5–15 sec round trip | Screen mesh size |
Total time from feed inlet to finished product: typically under 20 seconds for closed-circuit operation. Throughput up to 800 t/h on the largest LF and PFV models.
Engineered to maximize your profitability
$2–5 / ton
Higher selling price
The 80%+ cubical particle ratio produced by ASTON impact crushers meets EN, ASTM, and GB shape specifications for ready-mix concrete and asphalt — letting you sell premium-grade aggregate at $2–5 per ton above unshaped product. On a 200,000 t/year operation, that’s $400,000–1,000,000 in additional annual revenue from the same feed.
8 hrs → 30 min
Faster maintenance turnaround
The over-center hydraulic housing opens in minutes, letting a single operator complete a full blow bar swap in 30 minutes — down from a typical 8-hour shutdown. At an average production value of $300/hour for a mid-size plant, every blow bar change saves $2,250 in lost output.
30–40% longer
Wear part service life
High-chromium and chrome-molybdenum blow bars, combined with a 75%+ liner interchange rate, deliver 30–40% longer service life than industry-standard wear parts. For a typical limestone operation, this cuts annual blow bar spend by $15,000–40,000 and reduces wear-related shutdowns by half.
FAQs
Below are answers to some of the most common questions when selecting and operating a impact crusher for secondary crushing applications.
An impact crusher is a crushing machine that reduces material by high-velocity impact rather than compression. A heavy rotor spinning at 35–75 m/s (roughly 500–1,500 RPM depending on size) carries replaceable blow bars that strike feed material on entry, then throw the fragments against curved impact aprons for a second and third strike. The result is a high reduction ratio (up to 30:1) and a cubical product shape — both of which compression-based jaw and cone crushers struggle to achieve in a single stage.
ASTON manufactures two main impact crusher types: horizontal shaft impactors (HSI) under the PF / PFV / LF series for primary, secondary, and tertiary stages, and mobile configurations (tyre and crawler) built around the same crushing chambers.
They serve different stages of the crushing circuit and use opposite physics:
| Types | Jaw Crusher | Impact Crusher |
|---|---|---|
| Mechanism | Compression between two plates | High-velocity impact from rotor |
| Crushing stage | Primary | Secondary / tertiary (sometimes primary) |
| Reduction ratio | 4:1 – 6:1 | Up to 30:1 |
| Feed hardness | Up to 350 MPa, abrasive OK | Up to 350 MPa, low abrasion |
| Product shape | Flaky, irregular | 80%+ cubical |
| Wear cost | Lower per ton | Higher per ton, offset by higher reduction |
| Best for | Hard, abrasive primary feed | Limestone, recycled concrete, asphalt |
Both use impact-based crushing, but they’re designed for different jobs. A hammer mill uses smaller swing hammers and a perforated screen at the bottom of the chamber — material is held inside until it’s small enough to pass through the screen. This produces very fine output but locks particle size to the screen mesh, with no real-time adjustment.
An impact crusher uses larger fixed blow bars and adjustable impact aprons (no screen inside the chamber). Material exits when it’s small enough to pass through the gap between rotor and apron — and operators can change that gap hydraulically in minutes to adjust output. Impact crushers also handle larger feed (up to 800 mm vs 200 mm for most hammer mills) and produce more cubical, less over-fined product.
Choose a hammer mill for very fine grinding of soft material (coal, gypsum, fertilizer). Choose an impact crusher for aggregate, recycling, and any application where you need to adjust gradation without stopping the line.
There are two fundamental architectures, plus deployment variants:
Horizontal Shaft Impactor (HSI) — Most common. Rotor spins on a horizontal axis, blow bars strike feed on entry, aprons rebound material for secondary impact. Used for primary, secondary, and tertiary crushing. ASTON’s PF, PFV, and LF series are HSI machines.
Vertical Shaft Impactor (VSI) — Rotor spins on a vertical axis. Material accelerates in the rotor and either strikes a stationary anvil or other particles (rock-on-rock). VSI is specifically a shaping crusher — used after a cone or HSI to perfect particle shape and produce manufactured sand. Lower reduction ratio than HSI.
Rotor speed varies by model size, with a clear inverse relationship between rotor diameter and RPM:
| Rotor Diameter | Typical RPM | Tip Speed |
|---|---|---|
| 1000 mm (PF-1010) | 1,000–1,250 RPM | 50–65 m/s |
| 1250 mm (PF-1210, PFV-1214) | 800–1,000 RPM | 50–65 m/s |
| 1500 mm (PFV-1520) | 600–800 RPM | 50–65 m/s |
| 1800 mm (PFV-1820) | 500–700 RPM | 47–66 m/s |
Total operating cost per ton typically breaks down like this for a 200 t/h limestone operation:
| Cost Item | Typical Range | Share of Total |
|---|---|---|
| Wear parts (blow bars + liners) | $0.30–0.60 / ton | 35–45% |
| Power consumption | $0.20–0.40 / ton | 25–30% |
| Maintenance labor | $0.10–0.20 / ton | 10–15% |
| Lubrication & consumables | $0.05–0.10 / ton | 5% |
| Depreciation | $0.15–0.30 / ton | 15–20% |
| Total | $0.80–1.60 / ton | 100% |
