what is a Twin Shaft Mixer？
2025-11-12 13:29:40
By : root
A
twin shaft mixer (also called a double shaft mixer) is a high-efficiency mixing device equipped with two parallel, counter-rotating shafts fitted with paddles or blades. It is widely used in industrial production to blend powdery, granular, or paste-like materials, and is characterized by strong mixing intensity, uniform mixing results, and high processing efficiency.
The twin shaft mixer operates based on the synergy of counter-rotating shafts and specially designed paddles:
- Two parallel shafts rotate in opposite directions (usually at a speed of 30–60 rpm, adjustable according to production needs).
- Each shaft is equipped with multiple sets of paddles (or spiral blades) with specific angles and shapes. As the shafts rotate, the paddles lift, push, and shear the materials.
- Materials are subjected to three key actions simultaneously:
- Radial circulation: Paddles on opposite shafts push materials toward each other, creating cross-mixing.
- Axial movement: Angled paddles drive materials to move along the shaft (forward/backward), ensuring full blending of materials throughout the entire tank.
- Shearing and kneading: High-speed relative motion between paddles breaks up agglomerated materials and improves the uniformity of component distribution.
A standard twin shaft mixer consists of the following core parts, each with a specific function:
Due to its strong mixing capacity and adaptability to various materials, the twin shaft mixer is widely used in multiple industries:
- Construction Materials: Mixing concrete, dry-mixed mortar, cementitious materials, and lightweight aggregates (high mixing uniformity ensures stable product strength).
- Chemical Industry: Blending powdery chemicals (e.g., fertilizers, pesticides), rubber additives, and resin-based composites (prevents component segregation).
- Food & Pharmaceutical: Mixing food additives, grain powders, or pharmaceutical excipients (models with stainless steel tanks meet hygiene standards such as FDA or GMP).
- Environmental Protection: Treating solid waste (e.g., sludge, fly ash from waste incineration) by mixing with stabilizers or desiccants.
- Metallurgy & Mining: Preparing mineral powders, metal additives, or refractory materials (resistant to wear from hard particles).
- High Mixing Uniformity: The counter-rotating shafts and multi-directional material movement ensure the coefficient of variation (CV) of material blending is usually less than 5% (far lower than that of single-shaft mixers).
- Strong Adaptability: Suitable for materials with high viscosity, large particle size differences, or high moisture content (e.g., wet sludge, viscous pastes).
- Efficient Mixing: Short mixing time (usually 30–120 seconds per batch) and high production capacity, suitable for large-scale continuous production.
- Low Material Residue: The U-shaped tank and optimized paddle design minimize material accumulation in dead corners, reducing waste.
- Higher Equipment Cost: The complex structure (dual shafts, precision drive system) leads to higher manufacturing and purchase costs compared to single-shaft mixers.
- Larger Space Requirement: The equipment has a larger overall size (especially length) and requires more installation space.
- Higher Maintenance Demand: More moving parts (e.g., two shafts, multiple seals) mean more frequent maintenance (e.g., replacing worn paddles, maintaining seals) and higher maintenance costs.
- Not Ideal for Ultra-Fine Powders: For ultra-fine powders prone to flying, additional dust collection systems are required, increasing overall investment.
Suppliers of Twin Shaft Mixer：
Jinhua Machinery Provides High Quality And Effective Fertilizer Manufacturing Equipment, Straw Processing Equipment, Waste Processing Equipment, And Mining Equipment.If you are looking for fertilizer-making machines and production lines, feel free to contact us.Tel：0811-8185429 011-820-8086 E-mail：jinhuaindonesia@gmail.com
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