Impact crushing trades metal wear for product quality: the rotor throws the rock against impact plates and the rock breaks along its own grain boundaries. On limestone, dolomite and demolition concrete that trade is strongly in your favour — cubical product, high reduction, and a machine that adjusts to spec by changing rotor speed and gap, not by swapping liners.
On abrasive river gravel or quartzite the same trade turns against you, and we will say so — that is cone country. The SJ.F is for buyers whose rock is medium-soft or whose feed is recycled concrete and asphalt.
Product and workshop photographs from our own production lines — Hangzhou, Weihai and Wuhu.
Design & working principle
- Heavy one-piece rotor, dynamically balanced — the part that decides everything in an impact crusher; machined and balanced in our own workshops.
- Blow bars in Mn13Cr2 or high-chrome — matched to your rock; both profiles kept in stock for running models.
- Hydraulic-opened housing — full access to liners and blow bars in minutes, not hours; daily inspection stays realistic.
- Adjustable impact plates and grinding path — product size set by gap and rotor speed, so spec changes do not need a parts order.
- Third impact stage on larger models — for recycling duty where a single pass must reach a sellable 0–30 mm.
Parameter table
Published as a real HTML table, not a PDF or an image — so it can be read, copied and indexed. Figures are from our own product documentation; the datasheet and GA drawing follow on request.
| Model | Rotor (mm) | Feed opening (mm) | Max feed size (mm) | Capacity (t/h) | Motor power (kW) | Weight (t) |
|---|---|---|---|---|---|---|
| SJ.F.10.07 | 1,000×700 | 400×730 | ≤250 | 15–50 | 37–55 | 9.5 |
| SJ.F.10.10 | 1,000×1,050 | 400×1,080 | ≤300 | 50–80 | 55–75 | 13.2 |
| SJ.F.12.10 | 1,250×1,050 | 400×1,080 | ≤300 | 70–130 | 110–132 | 16.5 |
| SJ.F.12.14 | 1,250×1,400 | 400×1,430 | ≤300 | 90–180 | 132–160 | 19.5 |
| SJ.F.13.15 | 1,320×1,500 | 860×1,520 | ≤350 | 120–250 | 180–260 | 24.8 |
| SJ.F.13.20 | 1,320×2,000 | 860×2,030 | ≤500 | 160–350 | 300–375 | 30 |
Capacities are for medium-soft rock (limestone class). On recycling feed, expect the lower half of each range and plan the dust system accordingly.
Configuration & options
Blow bar metallurgy
Mn13Cr2 for limestone; high-chrome for abrasive recycled feed. We recommend based on your rock, not on margin.
Recycling package
Impact plates in wear-resistant castings, optional pre-screen for fines removal, and dust suppression points built into the housing.
Drive & power
50/60 Hz wound to your supply; VFD on request so rotor speed becomes a product-shape control.
How to choose the right model
- Start with the rock, not the tonnage: impact crushing rewards medium-soft, non-abrasive feed and punishes quartz. If your silica content is high, ask us before you fall in love with the price.
- Match the feed opening to your primary's discharge — the SJ.F wants a continuous slab of feed across the rotor width, not a trickle down one side.
- Budget blow bars by tonnage passed, not by time: send your monthly tonnage and we will quote wear cost per tonne honestly.
Delivery & service commitments
| Item | Commitment |
|---|---|
| Standard machine lead time | 60 days from order confirmation |
| Annual production capacity / monthly shipments | 1,000 units per year · 100 units per month (all ranges) |
| Spare parts supply | Within 2 months worst case; typically far faster for models in current production |
| Engineer attendance on site | Within 10 days of the requirement being agreed, for export markets |
| Remote support | Response within one working day; included, not charged |
| Warranty | Terms stated in the contract in the same words published on this site |
| Installation & commissioning | Guidance and supervision by our engineers, through to acceptance at rated capacity |
| Buyer provides | Site civil works, electrical installation and site access — drawings and answers supplied |
We supply the machines, the drawings, the commissioning support and the parts. We do not operate your plant after handover.
Common questions
Impact or cone for my limestone secondary?
If the rock is genuinely limestone-class and you want maximum cube plus fines for cement or road base, the SJ.F usually wins. If there is hard chert or quartz bands in the quarry, a cone costs less to run despite the higher price. Send the geological report and we will commit to one.
Do you stock blow bars for export buyers?
Yes — bar profiles for all six models are stocked, and spare sets ship within the standard spare-parts commitment (worst case within two months, typically far faster).