Secondary Jaw Crusher Working Principle, Models, Parameters, and Prices | Manufacturer's Selection Recommendations

Secondary Jaw Crusher, Secondary Jaw Crusher, Secondary Crus

In industries like mining, building materials, and metallurgy, the material crushing process typically consists of three stages: primary, secondary, and tertiary crushing. As the core equipment in the secondary crushing process, the secondary jaw crusher is the preferred choice for many companies due to its simple structure, high processing capacity, and easy maintenance. This article will provide an in-depth analysis of the working principle, performance characteristics, and selection criteria of a secondary jaw crusher, providing a reference for your production decisions.

What are primary and secondary jaw crushers?

A secondary jaw crusher (also known as a secondary jaw crusher) is typically located after the primary crushing unit (such as a primary jaw crusher or gyratory crusher) and is used to further crush materials with a particle size of 100-350mm to a medium particle size of 30-100mm. Its structure is similar to that of a primary jaw crusher, but its movable jaw stroke and chamber design are more suitable for secondary crushing, balancing crushing ratio and processing efficiency. 、

II. Core Working Principle

The machine uses a motor-driven pulley to drive the movable jaw in periodic reciprocating motion:

• Extrusion Crushing: When the movable jaw approaches the fixed jaw, the material is squeezed and crushed;

• Discharge Process: When the movable jaw leaves the fixed jaw, the crushed material falls due to gravity, and particles smaller than the discharge opening are discharged from the bottom.

Features: Deep cavity and small crushing plate tooth angle, suitable for secondary processing of medium-hard materials.

III. Application Scenarios and Advantages

1. Applicable Materials: Medium-to-high-hardness materials such as granite, basalt, and iron ore.

2. Industry Applications: Secondary crushing in mines, sand and gravel aggregate processing, and construction waste recycling.

3. Core Advantages:

• High crushing ratio (typically 4-6:1) and stable output;

• Simple structure, easy maintenance, and long life of wear-resistant parts;

• Lower motor power than cone crushers, resulting in lower energy costs.

IV. Key Selection Parameters

Parameter	Reference Range	Description
Feed Inlet Dimensions	250×400 to 600×900mm	Determined by primary crushing output
Maximum Feed Size	≤350mm	Avoid cavity clogging
Processing Capacity	20-200t/h	Adjusted based on material hardness
Motor Power	30-110kW	Affects equipment power output

Selection Recommendations:

• For materials with high hardness and low mud content, choose a deep-cavity model to increase output.

• For flexible adjustment of discharge particle size, focus on the hydraulic adjustment of the jaw plate gap.

V. FAQ

Q1: How to choose between a secondary jaw crusher and a cone crusher?

• Jaw crushers offer low investment and strong adaptability, suitable for medium-hard materials. Cone crushers offer a more optimized particle size profile, but are more expensive and suitable for high-intensity continuous production.

Q2: What should I do if the equipment's discharge particle size is uneven?

• Check jaw plate wear, adjust the discharge opening width, or add a screening circulation system. The secondary jaw crusher plays a crucial role in connecting the upper and lower stages of secondary crushing. Proper selection and maintenance can significantly improve the efficiency of the entire production line. Users are advised to comprehensively compare equipment parameters based on material characteristics, production capacity requirements, and budget, and consult with a professional manufacturer for on-site testing if necessary.