Editorial Technical Reference

Secondary Crusher

This page explains how Secondary Crusher is classified within Non-Metallic Mineral Product Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A crushing machine that processes material after primary crushing to achieve intermediate particle size reduction.

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Product Specifications

Technical details and manufacturing context for Secondary Crusher

Definition
The secondary crusher is a key component within a crushing plant that receives material from the primary crusher and further reduces it to a smaller, more uniform size suitable for downstream processing. It operates at an intermediate stage between primary crushing and final screening or tertiary crushing, typically handling feed sizes of 50-250mm and producing output in the 10-50mm range. This equipment is commonly used in non-metallic mineral product manufacturing, where it prepares material for further processing such as grinding or screening. The secondary crusher can be configured with different crushing mechanisms, including compression between surfaces (e.g., jaws, cones, rolls) or impact by rotating hammers, depending on the material characteristics and required product size. Key parameters to consider when selecting a secondary crusher include throughput capacity (50–300 t/h), feed opening size (250×750–600×900 mm), discharge setting range (20–80 mm), motor power (30–110 kW), eccentric shaft speed (250–350 r/min), maximum feed size (≤400 mm), crushing ratio (4–8), operating temperature (-20–40 °C), vibration amplitude (8–12 mm), weight (8–25 t), and noise level (≤85 dB(A)). These values are reference ranges and must be verified for the specific model and application. The crusher is typically made from high manganese steel, alloy steel, or cast iron, which are selected for their wear resistance and strength. Proper operation requires careful control of feed size, moisture content, and material hardness to prevent damage and ensure efficient crushing. Regular maintenance, including inspection of wear parts and lubrication, is essential for reliable performance. When sourcing a secondary crusher, it is important to verify model-specific specifications and compliance with applicable standards with the legal manufacturer or supplier.
Working Principle
Material is fed into the crushing chamber where it is compressed between two surfaces (such as jaws, cones, or rolls) or impacted by rotating hammers/beaters. The applied force fractures the material along natural cleavage planes, reducing it to smaller fragments that pass through discharge openings. The crushing action is influenced by the eccentric shaft speed, which typically ranges from 250 to 350 r/min, and the discharge setting, which can be adjusted to control product fineness. The material is reduced in size until it is small enough to exit the chamber, with the crushing ratio typically between 4 and 8. The process is continuous, with material being fed from the top and discharged from the bottom. The operating temperature range of -20 to 40 °C must be maintained to ensure proper lubrication and performance. Vibration amplitude, typically 8–12 mm, is critical for effective crushing force transmission. The crusher's weight, ranging from 8 to 25 tons, affects foundation requirements and installation. Proper feed size control is essential, as exceeding the maximum feed size of 400 mm may damage the crusher.
Common Materials
High manganese steel, Alloy steel, Cast iron
Technical Parameters
ParameterTypical rangeNotes & selection driver
Throughput Capacity50–300 t/hDepends on feed size and material hardness
Feed Opening Size250×750–600×900 mmDetermines max feed lump size
Discharge Setting Range20–80 mmAdjusts product fineness
Motor Power30–110 kWHigher power for harder materials
Eccentric Shaft Speed250–350 r/minAffects crushing efficiency
Max Feed Size≤400 mmExceeding may damage crusher
Crushing Ratio4–8Ratio of feed to product size
Operating Temperature-20–40 °COutside range may affect lubrication
Vibration Amplitude8–12 mmCritical for crushing force
Weight8–25 tAffects foundation requirements
Noise Level≤85 dB(A)Compliance with workplace safety

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Crushing Chamber
    Encloses the crushing elements and contains the material during size reduction
    Material: Wear-resistant steel
  • Crushing Elements Part
    Directly apply force to break the material (jaws, cones, hammers, or rolls)
    Material: High manganese steel
  • Drive System
    Transmits power from motor to crushing mechanism via belts, gears, or direct coupling
    Material: Alloy steel
  • Adjustment Mechanism
    Allows variation of discharge opening size to control product gradation
    Material: Steel
  • Frame Part
    Provides structural support and houses all crusher components
    Material: Structural steel
  • Eccentric Shaft
    Turns motor rotation into the crushing stroke.

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Secondary Crusher.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Atmospheric to 0.5 bar gauge
flow rate: 50-500 TPH
temperature: -20°C to 80°C
slurry concentration: Up to 60% solids by weight
Media Compatibility
✓ Hard rock (granite, basalt) ✓ Iron ore ✓ Recycled concrete/aggregate
Unsuitable: Highly abrasive materials with silica content >70%
Sizing Data Required
  • Feed size distribution (F80)
  • Required product size (P80)
  • Material hardness (Bond Work Index)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Bearing fatigue failure
Cause: Excessive vibration from material bridging, misalignment, or improper lubrication leading to spalling and overheating
Mantle and concave liner wear
Cause: Abrasive wear from hard, sharp feed material combined with high impact forces and improper feed distribution
Maintenance Indicators
  • Unusual metallic grinding or knocking sounds during operation indicating liner-to-liner contact or loose components
  • Excessive vibration visible on structure or audible as rhythmic pounding, suggesting imbalance, bearing issues, or material buildup
Engineering Tips
  • Implement predictive maintenance with vibration analysis and thermography to detect bearing and alignment issues before catastrophic failure
  • Optimize feed material distribution and size to prevent uneven liner wear and reduce tramp metal through proper upstream screening

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ISO 21873-1:2015 (Building construction machinery and equipment - Mobile crushers) DIN 22101 (Continuous conveyors - Belt conveyors for loose bulk materials)

Quoted from the published standard.

Manufacturing Precision
  • Rotor shaft alignment: +/-0.05mm
  • Crushing chamber liner thickness: -0/+2mm
Quality Inspection
  • Ultrasonic Testing (UT) for critical weld joints
  • Hardness Testing (Rockwell C) for wear-resistant components

Manufacturers of Secondary Crusher

Manufacturer profiles associated with Secondary Crusher.

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Frequently Asked Questions

What is the typical feed size range for a secondary crusher?

The typical feed size range is 50-250 mm, but the maximum feed size should not exceed 400 mm to prevent damage. The feed opening size can vary from 250×750 mm to 600×900 mm, depending on the model.

How is the discharge setting adjusted?

The discharge setting can be adjusted to control the product fineness, typically within a range of 20-80 mm. The exact adjustment mechanism depends on the crusher type (e.g., hydraulic or mechanical) and should be performed according to the manufacturer's instructions.

What materials are commonly used for the crusher's wear parts?

Common materials include high manganese steel, alloy steel, and cast iron. These are selected for their wear resistance and strength, but the specific material grade should be confirmed with the supplier for the intended application.

What are the key parameters to verify before purchasing a secondary crusher?

Key parameters include throughput capacity (50–300 t/h), motor power (30–110 kW), eccentric shaft speed (250–350 r/min), crushing ratio (4–8), operating temperature (-20–40 °C), vibration amplitude (8–12 mm), weight (8–25 t), and noise level (≤85 dB(A)). Always verify these values with the manufacturer for the specific model.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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