Lvlon makes impact crushing equipment in Henan, China. The PF and PFW series impact crushers serve as secondary and tertiary crushers in limestone quarries, concrete recycling plants and high-spec aggregate operations. Heavy-duty rotor design. High-chrome blow bars with four working faces. Three-stage impact chamber. Hydraulic hood opening on PFW models. Factory-direct pricing. OEM on rotor size, motor power and color.
Throw It. Break It. Throw It Again.
A jaw crusher squeezes rock. A cone crusher grinds it. An impact crusher hits it-hard and repeatedly.
The rotor spins at 500–800 revolutions per minute. The blow bars-high-chrome cast alloy bars bolted to the rotor circumference-move at 35–50 meters per second at the tip. A piece of limestone entering the crushing chamber gets struck by a blow bar moving at roughly 180 kilometers per hour. The impact sends the rock flying into the first impact plate. The rock fractures along its natural cleavage planes-the internal grain boundaries and micro-cracks that define the stone's structure. Impact fracture produces angular, cubical fragments, not the elongated flakes that compression crushing creates.
The fractured fragments rebound from the impact plate back into the rotor zone. The blow bars hit them again. They fly into the second impact plate. Fracture further. Rebound. Hit again. The third impact chamber repeats the cycle at tighter clearance. By the time the fragments are small enough to pass through the gap between the final impact plate and the blow bar tip, they have been struck and thrown three to five times. Every impact strips away weak material and sharpens the particle edges into a cubical shape.
The result is aggregate with flakiness typically in the 5–10% range-compared to 15–25% from a cone crusher processing the same feed. For high-spec asphalt surface course and high-strength concrete, that difference determines whether the aggregate meets the specification or gets rejected.
The Machine That Favors Soft Rock
The impact crusher is not a universal crusher. It is a limestone crusher, a dolomite crusher, a concrete recycling crusher. Feed it granite and the blow bars last 100–200 hours before the working face is worn smooth. Feed it limestone and the same bars last 400–800 hours per face-and each bar has four faces, rotated 90 degrees as each one wears. Total bar life in limestone: 1,600–3,200 hours before replacement.
The wear economics are simple. A limestone quarry running 2,000 hours per year replaces blow bars roughly once a year. A granite quarry running the same hours replaces blow bars every few weeks. The first operation runs an impact crusher profitably. The second should have bought a cone crusher.
This is not a shortcoming of the machine. It is a property of the crushing mechanism. Impact crushing works by velocity-kinetic energy transferred from the rotor to the rock. The energy breaks the rock, but it also abrades the blow bar surface. Hard, abrasive rock wears the bar faster than the bar can economically tolerate. The machine is not designed wrong. It is designed for a specific class of rock. Use it within that class and it outperforms alternatives on both particle shape and operating cost. Use it outside that class and the wear parts bill tells you within the first month.
Hydraulic Opening: The PFW Difference
The PF series opens for maintenance through a side access door. The operator climbs in with tools and replaces blow bars and impact plate liners through a confined opening. The job takes three to five hours on a mid-size machine.
The PFW series has a hydraulic cylinder that pivots the rear frame section open. Press the button on the hydraulic power pack. The rear housing swings down and away. The rotor is fully exposed. The operator stands comfortably at the open machine and works with overhead lifting access. The same blow bar change takes one to two hours.
The hydraulic system also adjusts the impact plate gap. Turn a valve handle on the side of the machine. The impact plates move closer to or further from the rotor. The gap sets the maximum discharge particle size. No need to stop, open an access panel and manually reposition heavy steel plates. Adjust on the fly. The belt scale downstream confirms the result within minutes.
For a limestone plant running 16 hours a day, the time saved on maintenance and adjustment over a year more than covers the price difference between PFW and PF. For a plant running a single 8-hour shift, the manual PF series is adequate. The choice is about operating hours, not about capability. Both series crush limestone to the same cubical specification.
Specifications
| Model | Rotor (mm) | Feed opening | Max feed | Capacity | Power |
|---|---|---|---|---|---|
| PF-1007 | Φ1,000×700 | 400×730 | ≤250 | 15–60 | 45 |
| PF-1010 | Φ1,000×1,050 | 400×1,080 | ≤300 | 50–90 | 55 |
| PF-1210 | Φ1,250×1,050 | 450×1,150 | ≤400 | 70–130 | 90 |
| PFW1210 | Φ1,250×1,050 | 450×1,150 | ≤400 | 75–140 | 90 |
| PFW-1214 | Φ1,250×1,400 | 480×1,500 | ≤430 | 100–180 | 132 |
| PFW-1315 | Φ1,320×1,500 | 860×1,520 | ≤500 | 130–220 | 200 |
| PFW-1320 | Φ1,320×2,000 | 900×2,000 | ≤500 | 160–350 | 250 |
| PFW-1515 | Φ1,500×1,500 | 930×1,550 | ≤600 | 200–400 | 280 |
| PFW-1520 | Φ1,512×2,000 | 930×2,040 | ≤700 | 300–450 | 355 |
| PFW-1820 | Φ1,800×2,000 | 1,620×2,040 | ≤700 | 500–800 | 2×315 |
All models: PF series with manual adjustment, PFW series with hydraulic impact gap control and hydraulic hood opening. High-chrome blow bars (4 working faces per bar). 1-year warranty. OEM on motor power, voltage and color.
Wear Parts
- Blow bars (high-chrome): limestone 400–800 h/face, 1,600–3,200 h total across 4 faces. Granite 100–200 h/face (not recommended for hard rock)
- Impact plate liners: 1.5–2× blow bar life
- Rotor bearings: 3–5 years
All wear parts stocked at factory. Global air freight to mine site in 5–15 days.
FAQ
Q: Impact crusher or cone crusher-which one for my rock?
Send a sample. Limestone, dolomite, shale: impact crusher. Better particle shape, lower flakiness for high-spec aggregate. Granite, basalt, diabase: cone crusher. The blow bars on an impact crusher wear out too fast on hard rock to be economical. The choice is dictated by the rock, not by the machine price.
Q: PF or PFW-is the hydraulic upgrade worth it?
PFW if your plant runs more than 8 hours a day. The hydraulic hood opening cuts blow bar changes from 3–5 hours to 1–2 hours. The hydraulic gap adjustment lets you fine-tune output size without stopping. Over a year of multi-shift operation, the saved downtime covers the price difference. PF if you run a single shift-the manual adjustments are adequate at lower utilization.
Q: How long do blow bars last?
Limestone: roughly 400–800 hours per working face. Each bar has four faces-rotate as each face wears. Total bar life 1,600–3,200 hours. Granite: 100–200 hours per face-this is why impact crushers are not recommended for hard rock.
Contact Lvlon for rock testing, model selection and factory quotation.
