Cobblestone crushing requires crushers suitable for their high hardness (Mohs hardness 6-7) and high wear resistance. The core requirements are "high crushing efficiency, long wear part life, and good finished product shape". Here is a targeted equipment selection plan:

I. Recommended Core Crushing Equipment: Choose Based on Capacity and Finished Product Requirements

1. Jaw Crusher (First Choice for Primary Crushing)

Applicable scenarios: The first crushing process in production lines of all scales, crushing cobblestones from above 500mm in particle size to below 100mm.

Core advantages:

• Compressive strength up to 320MPa, fully suitable for cobblestone hardness. The liner is made of high manganese steel, improving wear resistance by over 30%.
• Simple structure, low failure rate, and wide processing capacity range (10-1000 tons per hour), suitable for different needs from small sand factories to large stone production lines.

Notes: Only used for primary crushing. The finished product is irregularly块状 and needs to be refined with subsequent equipment.

2. Cone Crusher (Main Equipment for Secondary/Fine Crushing)

Applicable scenarios: The second crushing process in medium and large production lines, further crushing cobblestones after primary crushing to 20-50mm, especially suitable for scenarios requiring finer finished product particle size (such as concrete aggregates).

Core advantages:

• Adopting the principle of laminated crushing, it maintains stable capacity when crushing high-hardness materials, with a processing capacity of 50-2000 tons per hour.
• The hydraulic adjustment system can quickly adjust the discharge particle size, resulting in more uniform finished product shape with needle-like content below 10%.

Recommended models: Single-cylinder hydraulic cone crusher (for medium and small capacity) and multi-cylinder hydraulic cone crusher (for large capacity, more energy-efficient).

3. Impact Sand Making Machine (Integrated Sand Making + Shaping)

Applicable scenarios: Scenarios requiring the production of artificial sand with specifications such as 0-5mm and 5-10mm. It can directly crush and shape cobblestones, and the finished product meets the standards for construction sand.

Core advantages:

• The impeller linear speed is up to 50-80m/s, achieving efficient crushing through "stone-on-stone" or "stone-on-iron" mode, while optimizing the particle shape and ensuring reasonable gradation of finished products.
• Wear parts are made of high chromium cast iron or ceramic composite materials, improving wear resistance against cobblestones by 50% and reducing replacement frequency.

Processing capacity: 10-500 tons per hour, suitable for small and medium sand production lines or as a shaping equipment after fine crushing.

II. Combined Schemes: Matching Based on Capacity Scale

1. Small Production Line (10-50 tons per hour)

Jaw crusher + Impact sand making machine

• Advantages: Simple process, low investment cost, suitable for rural road construction and self-use in small mixing stations.

2. Medium Production Line (50-200 tons per hour)

Jaw crusher + Cone crusher + Impact sand making machine

• Advantages: Reducing the load of the sand making machine through intermediate crushing by the cone crusher, extending the service life of wear parts and improving overall efficiency.

3. Large Production Line (over 200 tons per hour)

Jaw crusher + Multi-cylinder cone crusher + Impact sand making machine + Vibrating screen

• Advantages: Layered crushing + multi-stage screening, capable of producing aggregates of various specifications simultaneously to meet the needs of large infrastructure projects.

III. Key Selection Parameters: Avoiding Capacity Waste or Insufficiency

• Crushing ratio: Cobblestone crushing requires a total crushing ratio of 10-20 (e.g., crushing 500mm raw materials to 25-50mm). When the crushing ratio of a single equipment is insufficient, phased crushing is necessary.
• Wear part life: Priority is given to models equipped with an automatic lubrication system for wear parts, which can reduce downtime for maintenance caused by high wear of cobblestones.
• Power matching: The motor power must match the processing capacity. For example, for a production line with 100 tons per hour, the jaw crusher motor is recommended to be 75-110kW, and the cone crusher 160-220kW.

IV. Notes

• Pretreatment: If the mud content of cobblestones exceeds 5%, a ore washing machine or pre-screening equipment should be added to avoid blocking the crushing chamber.
• Environmental protection requirements: The crushing process generates a lot of dust, so a pulse dust collector (with an air handling capacity of not less than 5000m³/h) should be equipped to meet the standard of dust emission concentration ≤30mg/m³.