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When testing aggregates, ores, coal, or coke in geotechnical or construction materials testing laboratories, sample preparation often involves the reduction of particle sizes from the initial bulk or field sample. Many of these materials are hard, tough, or brittle, so crushing them into smaller sizes is an ideal application for robust, rugged, and durable jaw crushers.
All jaw crushers operate on the same straightforward principle; two hard-faced heavy plates or jaws crush large particles between them. One powered jaw reciprocates in an elliptical motion opposite a stationary jaw mounted in the frame.
During an operating cycle, the gap between the two jaws opens; a particle drops in, and the jaws close in and crush the particle. Further crushing of the fractured pieces continues until particles are small enough to fall through the bottom opening by gravity. The jaws face each other at a slight vertical angle, so particles become smaller as they progress toward the bottom.
A simple adjustment of the distance between the two jaws regulates the final sample size. The term, "final size" can be a little vague. It refers to the approximate maximum particle size at completion of crushing, but the size range and distribution can vary considerably based on the material properties of the sample.
Many factors make laboratory jaw crushers the optimum selection for effective and efficient primary crushing of hard, brittle, rock-like materials.
Jaw crushers can also have some disadvantages compared to other types of size reduction.
How to Choose:
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The selection of the best jaw crusher for your application will naturally be governed by the particle size, volume, and properties of your bulk material, along with the desired particle size and quantity of the final sample. The size of the jaw plates limits the particle size capacity and determines the size of the feed opening. In general, maximum particle sizes are about 70-80% of the feed opening, but this can vary by manufacturer and model. Jaw materials are available in a variety of materials to adapt to the hardness and toughness properties of samples and to extend service life.
Our Recommendations:
Small Crushers: For applications where reduced quantities of materials with smaller top sizes and final sizes are needed, these smaller jaw crushers fit the bill. Their compact size allows easy positioning anywhere in the lab, even on a benchtop.
¹ Final Size is an approximate maximum particle size of the material after crushing with the opening set to its minimum clearance. Particle size distribution will vary by material type.Medium Crushers: These useful models have the capacity, size, and power to meet most primary crushing functions in the lab. Options for voltage configurations add to their versatility.
¹ Final Size is an approximate maximum particle size of the material after crushing with the opening set to its minimum clearance. Particle size distribution will vary by material type.Large Crushers: When size, capacity, and throughput are the most sought-after features, these units are the best choice. Some models can be ordered with gasoline or Diesel engines for mobile on-site work at remote locations or pilot plants.
We hope this blog post has helped you select the right jaw crusher. Please contact the testing experts at Gilson to discuss your application.
Standard Test Methods, Specifications, and Practices
Individual test methods and specifications referenced in our product descriptions, blog articles, and videos are available for review or purchase from the professional organizations noted.
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