Impact-Resistant Structural Design and Analysis for Coal Mining Machinery

Coal mining machinery suffers from frequent impact loads including rock bursts, blasting vibration, and ore impact. Traditional structures often fail due to stress concentration and insufficient energy absorption. This study establishes a systematic impact-resistant design system and achieves significant performance improvements.

1. Impact Load Characteristics

• Instantaneous high energy: milliseconds duration, peak several to dozens of static load
• Composite loads: axial, radial, and vibration impacts together
• Random occurrence: time, position, and strength are unpredictable

2. Defects of Traditional Structures

• Over-rigid design: high stress concentration, easy to crack and break
• Excessively flexible design: low bearing capacity, large deformation, functional failure
• Lack of energy dissipation system, easy to cause secondary impact

3. Core Impact-Resistant Design Methods

3.1 Bionic & Gradient Structure

• Bionic honeycomb and antler branch structure for stress dispersion
• Rigid core + flexible buffer + rigid shell gradient layout
• Arc / trapezoidal section to reduce stress concentration

3.2 High-Performance Material Matching

• High-strength alloy steel for key load parts
• Metal-ceramic coating and fiber-reinforced composites
• High wear-resistant alloy for conveyor and shearer parts

3.3 Multi-Path Energy Dissipation

• Controllable deformation units for elastic energy absorption
• Friction plates for sliding energy consumption
• Hydraulic and viscoelastic damping for vibration suppression

3.4 Optimized Connection Design

• Bolt-spring flexible connection instead of rigid bolt
• Groove welding with transition arc and stress relief treatment
• Integral forging to reduce joints and enhance integrity

4. Analysis Methods

• Static analysis: stress distribution and strength check
• Dynamic analysis: impact response and energy transfer
• Modal analysis: natural frequency and resonance avoidance

5. Application Performance Improvements

6. Economic & Safety Benefits

• Annual maintenance cost reduced by over 2 million yuan per mine
• Production efficiency increased by 30%
• Safety accidents reduced by 90%
• Investment return period within 1 year

7. Conclusion

• The “load adaptation + buffer + energy dissipation” system effectively resists impacts
• Bionic, gradient, composite, and energy dissipation designs are core technologies
• Significantly improves safety, stability, and service life
• Provides a reliable solution for intelligent and safe mining