1) The document discusses different types of stone crushers, including primary jaw crushers, secondary cone crushers, and tertiary crushers that can produce finer outputs.
2) Spring cone crushers are described as having stable construction, high quality, easy adjustment, and low operating costs. They include safety mechanisms to prevent damage.
3) Stone crushers are used widely in construction and other industries to produce crushed stone aggregates for uses like highways, buildings, and concrete products. Locating crushers near quarries reduces waste.