Double Shaft Shredder Blades & Twin Shaft Shredder Blades
What Are They?
They are key cutting parts for solid waste recycling machines.
Their wear resistance and impact resistance affect: crushing efficiency, output particle uniformity, energy use, machine life and maintenance costs.
Two shafts rotate in opposite directions to mesh, shear and tear materials (better than single-shaft machines).
They can handle hard-to-process materials: metal, plastic, construction waste, household waste.
Choosing the right blades helps improve efficiency and cut costs.
Core Working Principle
Two independent shafts rotate in opposite directions synchronously.
Claw-type blades are arranged in a spiral, staggered way to form a crushing chamber (prevents slipping and jamming).
Powerful torque provides shear and tear force to turn large materials into small, uniform pieces (works at 5.5–10 rpm: low speed, high torque).
Staggered blades ensure continuous shearing, which is more efficient than single-shear mode.
Blade Structure Design
1. Customizable Claw Specifications
Claw options
2-claw, 3-claw, 6-claw, 8-claw, 12-claw (more claws = finer output).
Thickness options
10mm, 20mm, 40mm, 50mm, 75mm (thicker = stronger impact resistance for hard materials).
2. Modular Quick-Change Design
3. Enhanced Torque Transmission
Main shaft: spline/hexagonal structure (matches blade inner hole perfectly).
Balances force, prevents blade cracking and shaft deformation (suitable for high-load continuous work).
Blade Material Selection
Choose materials based on the waste type (avoids cost waste or quick wear):
High Manganese Steel
Tough, impact-resistant; good for municipal waste, construction waste, and waste with sand/impurities.
Alloy Tool Steel (9CrSi)
Hard, wear-resistant; low cost; good for soft waste (rubber, paper, fibers).
Cold Work Tool Steel (Cr12MoV, SKD-11)
Very wear-resistant and impact-resistant; little heat deformation; good for medium-hard waste (wood, hard plastic, metal scraps, tires); hardness HRC 58–62.
Hot Work Tool Steel (H13)
All-around performance; good for multi-scenario use, especially high-load industrial waste processing.
Applicable Materials
Metals: Aluminum cans, paint cans, car shells, scrap steel, metal scraps.
Synthetic Materials: Plastic films, woven bags, plastic barrels, electronic casings, circuit boards.
Construction/Mixed Waste: Renovation waste, bulky waste, landfill screen rejects (use high-manganese steel).
Organic Materials: Used furniture, branches, garden waste, dewatered kitchen waste.
Special Materials: Whole tires (reinforced blades), industrial mixed waste (customizable).
Core Performance
Long service life: SKD-11/DC53 blades can be reground 4 times; 4 cutting edges (reduces replacement costs).
Stable operation: PLC control + overload reversal; low noise (<85dB), low dust; 24-hour continuous work.
Efficient and energy-saving: Reduces energy consumption by 15%-30% (cuts operating costs).
Maintenance & Upkeep
Regrind regularly: Restore sharpness (high-quality blades can be reground 4 times).
Adjust gaps: Check and adjust blade gaps (prevents poor efficiency and uneven output).
Replace worn parts: Replace chipped/cracked blades (avoids equipment failure).
Check bolts: Tighten blade bolts before/after use (ensures safety).
Purchase Recommendations
Match materials: Hard waste (metal, hard plastic) → SKD-11/Cr12MoV; high-impact waste → high-manganese steel; soft waste → 9CrSi.
Choose structure: Modular quick-change + hexagonal shaft (easier maintenance); more claws for fine output, fewer for coarse crushing.
Cost-effective options: Municipal waste → high-manganese steel + variable frequency drive (balances performance and energy saving).
Customize wisely: Provide manufacturer with machine model, shaft diameter, waste type, and desired output size.
How to Choose Blade Thickness?
Thickness depends on material hardness, machine size, torque, and feed size.
Key Rules
Material hardness
Soft (plastic, wood) → 15–25mm; Medium (rubber) → 30–40mm; Hard (metal) → 50–100mm.
Machine torque
Small machine → 15–30mm; Medium → 30–50mm; Large → 50–100mm.
Feed size
Large/heavy feed → thicker blades; Fine shredding → thinner blades.
Material match
H13 → 40–100mm; 9CrSi → 20–50mm; Cr12MoV → 15–40mm.
