Left Side Mixing Arm
Technical Specifications
Key Attributes
| Product Name | Left Side Mixing Arm / Left-Hand Mixer Lever |
| Material Grade | GS700 / GGG70 Pearlitic Ductile Iron, Forged 42CrMo4 Steel |
| Tensile Strength | 700 – 750 MPa (Yield Strength 420–480 MPa) |
| Brinell Hardness | 260 – 320 HB (Matrix: Pearlitic Spheroidized Graphite) |
| Shaft Coupling Type | Square Shaft (90° Index), Hexagonal Shaft (60° Index), Round Keyway |
| Pitch Angle | +45° Left-to-Right Axial Flow Pitch |
| Machine Compatibility | BHS, SICOMA, Liebherr, Teka, SIMI, ELKON, MEKA, Linz |
| Casting Process | Computerized Mold Thermal Simulation & MagmaSoft NDT Testing |
| Brand Name | VOTNE |
| Place of Origin | China |
| SEO Keywords | left side mixing arm, concrete mixer arm, twin shaft mixer arm, BHS mixing arm, SICOMA mixer arm, ductile iron mixer lever, concrete wear parts |
Product Overview
VOTNE Left Side Mixing Arms are heavy-duty structural levers engineered specifically to transmit high motor torque from rotating drive shafts to mixing blades in industrial twin-shaft concrete mixers.
Mounted on the left-hand section of counter-rotating mixing shafts, left side mixing arms are cast with a precise +45° axial pitch profile. During high-speed batching, this pitch propels dense concrete slurry axially from left to right toward the central crossover zone, creating 3D figure-8 circulation. Operating as a cantilever beam submerged in heavy concrete, the arm experiences severe cyclical bending loads and sudden shock impacts when coarse aggregates (40mm to 60mm) wedge against trough liners. Standard gray iron arms snap at the neck under these forces, causing catastrophic blade detachment and liner gouging. VOTNE left side mixing arms utilize high-strength GS700 pearlitic ductile iron (700 to 750 MPa tensile strength) with over 90% spherical graphite nodules, completely eliminating brittle fracture risks.
Featuring CNC-machined split clamping hubs and Grade 10.9/12.9 fastener hardware, VOTNE left side mixing arms maintain a zero-backlash fit on square and hexagonal shafts, protecting drive gearboxes and lowering your total cost per cubic meter.
Material & Metallurgy Selection
| Material Grade | Tensile Strength | Yield Strength | Impact Toughness | Best Application |
|---|---|---|---|---|
| VOTNE Forged 42CrMo4 Steel | 850 - 1000 MPa | 650 - 750 MPa | Extreme (>35 J/cm²) | Heavy Dam Mass Concrete & 60mm Stone Drops |
| VOTNE GS700 Ductile Iron | 700 - 750 MPa | 420 - 480 MPa | High (10 - 14 J/cm²) | Commercial Ready-Mix & Precast Concrete Plants |
| Standard GGG40 Ductile Iron | 400 - 450 MPa | 250 - 310 MPa | Medium (8 - 10 J/cm²) | Light-Duty Mortar & Small Pan Mixers |
Technical Specifications & Dimensions
| Mixer Brand / Model | Shaft Profile Size | Clamp Bolt Spec | Arm Neck Cross-Section | Approx. Weight (kg) |
|---|---|---|---|---|
| BHS DKXS 2.0 / 3.0 | 80mm Square Shaft | M20 Grade 10.9 (2 Screws) | Heavy Diamond Section | 24.5 kg |
| SICOMA MAO 2250 / 3000 | 70mm Hexagonal Shaft | M18 Grade 10.9 (2 Screws) | Reinforced Oval Neck | 19.8 kg |
| Liebherr DW 2.25 / 3.0 | 90mm Square Shaft | M20 Grade 12.9 (2 Screws) | Extra-Duty Box Section | 28.2 kg |
| TEKA TPZ 1500 / 2250 | 60mm Round Keyway | M16 Grade 10.9 (Wedge Bolt) | Tapered Lever Arm | 16.5 kg |
| Custom OEM Drawings | Custom Shaft Profile | As Per CAD Drawing | Tailored Section | Custom |
Key Advantages for Plant Operators
High Bending Fatigue Resistance
GS700 pearlitic ductile iron with 90%+ spherical graphite nodules stops fatigue crack propagation under millions of cyclical bending forces.
Optimized Axial Slurry Recirculation
Precision-cast +45° pitch angle forces concrete slurry toward the center, achieving 98% mix homogeneity within 30 seconds of mixing.
Zero-Backlash Split-Hub Clamping
CNC-machined split hubs clamp onto square or hexagonal shafts with zero rotational play, eliminating keyway fretting and shaft damage.
Eliminates Catastrophic Arm Snap
High yield strength (420–480 MPa) absorbs sudden aggregate wedging impacts without fracturing, protecting mixer trough liners.
Standard & Custom OEM Stock
Direct replacement left-side mixing arms in stock for major European and Asian mixer brands, plus rapid custom casting available.
Applications & Field Use Cases
VOTNE Left Side Mixing Arms are widely specified across heavy-duty industrial batching operations:
- Commercial Ready-Mix Concrete Batching Plants (Twin-Shaft Mixers 1.0m³ to 4.5m³)
- Precast Concrete Production Facilities (Planetary and Counter-Current Pan Mixers for pipe, beam, and precast slab casting)
- High-Impact Infrastructure & Dam Construction Projects (Mass concrete mixing with 40mm to 60mm aggregate)
- Cold Recycled Pavement & Road Base Mixing Plants
- Mining Paste Fill & Underground Backfill Preparation
- Refractory & Industrial Chemical Production Systems
Frequently Asked Questions (FAQ)
1. How can I distinguish a Left Side Mixing Arm from a Right Side Mixing Arm on site?
Look at the pitch angle of the blade mounting pad relative to the shaft hub split. A Left Side Mixing Arm has a positive pitch (+45°) that tilts left-to-right when viewed from the drive end, propelling material toward the center. VOTNE mixing arms also feature a cast letter mark ('L' or 'R') on the arm neck for instant field identification.
2. Why is GS700 pearlitic ductile iron superior to gray iron for mixing arms?
Gray iron contains brittle flake graphite that acts as internal micro-cracks, causing arms to snap under aggregate impacts. VOTNE GS700 ductile iron contains spherical graphite nodules in a high-strength pearlitic matrix (700–750 MPa tensile strength), allowing the arm to absorb massive shock loads without fracturing.
3. What clamp bolt torque should be applied during installation?
For M18 Grade 10.9 clamping screws, torque to 330–360 N·m. For M20 Grade 10.9/12.9 screws, torque to 480–520 N·m. Always apply medium-strength threadlocker (Loctite 243) to bolt threads and re-torque after the first 24 hours (500 m³) of batching operation.
4. Can VOTNE manufacture custom left mixing arms for non-standard shafts?
Yes. VOTNE produces custom mixing arms based on customer sample castings or 2D/3D CAD drawings. We can customize square or hexagonal shaft hub dimensions, arm length, pitch angle, and blade mounting hole centers.
5. What are your lead times and trade terms for export orders?
Standard replacement left mixing arms for BHS, SICOMA, and Liebherr mixers are kept in stock for immediate shipment. Custom casting orders take 15 to 25 days. We support EXW, FOB, CIF, and DDP trade terms with global delivery.