Double-screw mixer, also known as horizontal spiral ribbon mixer, is a high-efficiency intermittent mixing equipment suitable for low bulk density powder, granules and solid-liquid mixing. Its core is to achieve dead-angle mixing of materials through the synergistic effect of internal and external spiral ribbons, and is widely used in carbon powder pelletizing production lines.

1. Main structure:

U-shaped cylinder: horizontal U-shaped structure, convenient for material circulation and less residue;

Double spiral ribbon: the outer spiral ribbon pushes the material from both sides to the center, and the inner spiral ribbon pushes in the opposite direction to form convection;

Transmission system: the motor drives the reducer to drive the main shaft to rotate, and some models support variable frequency speed regulation to meet different mixing needs.

Sealing device: the shaft end adopts a special sealing design to prevent dust leakage and meet the clean production standards.

2. Optional configuration:

Spraying/adhesive addition system: used to add liquid components (such as liquid additives/water, etc.)/powdered adhesives to achieve uniform solid-liquid mixing;

Heating/cooling jacket: the outer layer of the cylinder is equipped with a jacket to meet the material temperature control requirements;

Steam inlet channel: to meet the needs of heating the mixture by steam in some areas in winter;

The shape of the cylinder can be customized: U-shaped structure or cylindrical structure.

3. Working Principle

The double-screw mixer achieves efficient mixing through the triple mechanisms of convection, shearing and diffusion:

3-1: Convection mixing

The outer spiral ribbon pushes the material to gather towards the center, and the inner spiral ribbon diffuses in the opposite direction, forming a two-way material flow and eliminating dead corners of mixing.

3-2: Shear mixing

The shear force is generated between the edge of the spiral ribbon and the material, effectively breaking up agglomerated particles (such as agglomerated dry powder, sticky materials);

3-3: Diffusion mixing

At the microscopic level, the material is homogeneously distributed due to mechanical vibration and collision, which is suitable for fine materials (such as lithium battery positive electrode materials).