A jaw crusher is usually the first main machine in a fixed aggregate plant. If it is too small, large rock bridges at the inlet and the whole line becomes unstable. If it is too large, the plant pays for extra power, foundation and steel structure that may not be needed.
The right model is not selected by price alone. It should be checked against feed size, target capacity, rock hardness, discharge setting, downstream equipment and site layout.
1. Start With The Largest Feed Size
For primary crushing, the largest rock size is the first boundary. Do not only look at the average material size. One oversized stone can block the feed opening and stop the whole line.
Before asking for a model, collect:
- Maximum stone size after blasting or excavating
- Whether the size is stable or changes by working face
- Whether soil, clay or fines are mixed with the stone
- Whether a bar feeder or grizzly feeder will remove small material before crushing
As a practical selection habit, the feed opening should leave enough margin above the largest feed size. If the material includes irregular boulders, bridge stones or construction waste blocks, the margin should be larger.
2. Check Capacity Under Real Material Conditions
Catalog capacity is normally measured under controlled conditions. Real production changes with:
- Rock hardness and abrasiveness
- Feed grading
- Moisture and clay content
- Discharge setting
- Whether the crusher is fed continuously
- Downstream belt and screen capacity
Hard rock such as granite, basalt and river pebble normally needs more margin than limestone. If the target output is 150 t/h, the jaw crusher should not be selected at the very top of its capacity range. A plant running at full load all day is more likely to face bearing temperature, belt slip and unstable discharge.
3. Match The Discharge Setting With The Next Machine
The jaw crusher does not produce final manufactured sand by itself. Its discharge size must match the next crushing or screening stage.
Common combinations include:
- Jaw crusher + cone crusher for hard rock aggregate
- Jaw crusher + heavy hammer crusher for medium-hard limestone or concrete waste
- Jaw crusher + roller crusher or fine crusher for small sand-making lines
- Jaw crusher + screen + sand washer for washed aggregate and manufactured sand
If the downstream crusher requires feed below 150 mm, the jaw crusher CSS and screen return should be planned together. A jaw crusher selected only by maximum feed size may still produce discharge that is too coarse for the next stage.
4. Choose The Jaw Crusher By Working Role
For TONZO’s WLC series, the public model range can be used as a preliminary reference:
| Model | Feed Opening (mm) | Max Feed (mm) | CSS Range (mm) | Capacity (t/h) | Motor (kW) |
|---|---|---|---|---|---|
| WL80 | 800 x 500 | <=420 | 40-100 | 40-90 | 45 |
| WL110 | 1100 x 700 | <=600 | 60-130 | 110-230 | 90 |
| WL125 | 1250 x 800 | <=680 | 70-150 | 160-320 | 132 |
| WL140 | 1400 x 900 | <=760 | 80-180 | 220-420 | 160 |
| WL160 | 1600 x 1000 | <=860 | 90-200 | 300-550 | 220 |
| WL200 | 2000 x 1300 | <=1100 | 100-250 | 480-850 | 315 |
These figures are used for preliminary selection. The final configuration should be checked against material hardness, feed grading, moisture, finished product size and plant layout.
5. Do Not Ignore Feeding And Discharge
Many jaw crusher problems are caused by equipment around the crusher, not only the crusher itself.
For the feed side, check:
- Hopper volume and truck feeding method
- Bar feeder width and stroke
- Whether fine soil needs to bypass the crusher
- Whether tramp metal may enter with construction waste or old concrete
For the discharge side, check:
- Belt width and transfer height
- Whether the discharge pile can clear fast enough
- Whether the next crusher or screen can accept the material
- Whether dust control or spray points are required
If the discharge belt is undersized, material can back up below the jaw crusher and cause overload or repeated stoppage.
6. When A Larger Model Is Worth It
A larger jaw crusher may be reasonable when:
- The quarry face produces occasional oversized boulders
- The plant will expand capacity later
- The machine must run long shifts with low stoppage risk
- The material is hard and abrasive
- The site wants lower load per machine rather than maximum output from one smaller crusher
But oversizing is not always better. If the plant is small and the feeding volume is limited, a very large jaw crusher can increase investment, foundation cost and no-load power consumption without improving the final product.
7. Information To Provide Before Quotation
For a faster and more accurate recommendation, prepare:
- Material name and photos
- Maximum feed size
- Target capacity per hour
- Required discharge size after primary crushing
- Downstream equipment, if already available
- Moisture, clay or soil condition
- Site voltage and installation space
- Whether the plant is fixed or mobile
With these details, the jaw crusher can be matched with the feeder, belt conveyor, secondary crusher, screen and washing equipment instead of being selected as a separate machine only.