The double-stage crusher and the hammer crusher are two different types of crushing equipment with significant differences in their working principles and application areas.

Hammer Crusher:

The hammer crusher is a device that uses rapidly rotating hammers to impact and crush materials. Materials are fed into the crushing chamber and undergo impact and crushing by the hammers' high-speed rotation. This type of crusher is commonly used for materials of medium hardness and brittleness, such as limestone and gypsum.

Double Stage Crusher:

The double-stage crusher is a device that crushes raw materials twice. Initially, the materials undergo the first-stage crushing to obtain smaller particles. Subsequently, these smaller particles undergo the second-stage crushing to achieve finer particles. This type of crusher is suitable for handling special materials, often used for processing high-moisture, high-viscosity, or clay-like raw materials.

Therefore, the double-stage crusher is not an upgraded version of the hammer crusher but rather a different type of crushing equipment with specific application scenarios and advantages. The choice between these crusher models typically depends on factors such as the nature of the raw materials, production requirements, and process considerations.