The Single Cone Double Screw Mixer is a classic device for non-destructive, uniform mixing of powders and granular materials (especially those that are shear-sensitive and prone to breakage and agglomeration). Its unique design and operating principle achieve its unique characteristics.
Coreal Machinery has compiled some information for your reference.
I. Core Design
The Single Cone Double Screw Mixer's structure consists of three main components:
1. Conical Cylinder: The conical design allows materials to flow downward by gravity, eliminating dead zones.
2. Two Asymmetric Helical Impellers: The propellers rotate to lift the material from the bottom and orbit to sweep the cylinder walls. The asymmetric design expands the mixing range, achieving full-range mixing.
3. Drive System: The drive system can independently adjust the rotation and revolution speeds to meet different material mixing requirements.
II. Mixing Principle: How does it achieve uniform and non-destructive mixing
"Non-destructive, uniform mixing" is the result of the gentle synergy of three mixing mechanisms: convective mixing, diffusion mixing, and shear mixing.
1. Gentle and efficient convection mixing: The propeller rotates to lift the material to the top and then disperses it, without strong squeezing or impact (no damage). Revolution circulates the material throughout the entire surface, creating all-round convection and quickly eliminating macroscopic variations (uniformity).
2. Exquisite diffusion mixing: As the material is lifted and dispersed, particle interfaces penetrate and interlock, and micro-motion adjustment is achieved, achieving microscopic uniformity without external forces (no damage).
3. Controllable gentle shear mixing: The propeller rotates at a low speed, sweeping/penetrating the material agglomerates, generating gentle shear force to break up the agglomerates. The shear force is controllable and gentle, achieving "deagglomeration without fragmentation" (no damage).
III. Key Operating Factors
1. Speed Optimization: The propeller controls the lifting speed and circulation (high rotation speed shortens the cycle, and high rotation speeds are not suitable for brittle materials); the revolution speed controls the mixing range and shear force (ensuring no dead spots; high rotation speeds increase impact). A "low shear formula" (high revolution speed + low rotation speed) is often selected for efficient and non-damaging mixing.
2. Mixing Time Control: High mixing efficiency results in shorter mixing times. Excessive mixing consumes energy and damages the material; optimal mixing time requires experimentation.
3. Feeding Sequence: For materials with significantly different proportions/densities, feeding them sequentially to facilitate convection pre-dispersion can shorten mixing time and improve uniformity.
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