The double-shaft mixer is a device that achieves material mixing, homogenization or humidification through the coordinated rotation of two stirring shafts. Its working principle combines mechanical movement with the dynamic characteristics of materials. It has a reasonable design, efficient and stable operation, and good stirring effect. It is widely used in the briquetting production line.

1. Composition of twin-shaft mixer:

1-1: Motor, power output device;

1-2: Reducer, converts the high speed of the motor into low speed and high torque, and transmits it to the mixing shaft;

1-3: Gearbox: The gears installed synchronously in reverse are connected to the two main shafts;

1-4: Mixing blades: Driven by the main shaft, synchronous reverse operation provides shearing, impacting and flipping, and pushes the material forward to achieve shear mixing, convection mixing, and diffusion mixing;

1-5: Box and frame and cover: Provide storage and mixing space for materials, and the added cover helps to prevent dust from spilling;

2. Core structure and movement mode of twin-shaft mixer:

2-1: Twin-shaft structure: Two parallel mixing shafts achieve synchronous rotation through synchronous reverse rotating gear transmission, so that the material is fully sheared, impacted and flipped by the blades between the two shafts;

2-2: Distribution of mixing blades: Spiral fan-shaped blades, blades or mixing arms are installed on the shaft, staggered at a certain angle to form a continuous propulsion and mixing effect. The shape of the blades can be adjusted according to the characteristics of the material (such as wide blades for viscous materials and narrow blades for loose materials).

3. Working principle of the twin-shaft mixer:

3-1: Shear mixing

When rotating in opposite directions, the two-shaft blades exert shear force on the material, tearing the agglomerated materials and destroying the material stratification, which is suitable for the dispersion and homogenization of powdery or viscous materials (such as anthracite). When rotating at differential speeds, the high and low speed blades form a velocity gradient to enhance the local shear effect.

3-2: Convection mixing

The mixing blades push the material to move in the axial and radial directions, forming a three-dimensional circulation flow, promoting the exchange of materials in different regions (such as the uniform distribution of anthracite, adhesives and water). When rotating in the same direction, the material flows in the same direction, which is suitable for continuous production lines (such as briquette production).

3-3: Diffusion mixing

At the microscopic level, the material particles produce Brownian motion due to mechanical vibration and collision, achieving fine homogenization.

4. Materials moving direction

4-1: Feeding stage

The material and the adhesive to be added enter the mixing chamber through the feed port, and the double-axis mixing blades quickly disperse them throughout the chamber.

4-2: Mixing stage

The material is repeatedly sheared, impacted, and flipped under the action of the mixing blades, and is pushed along the axial direction to gradually achieve homogenization.

If humidification is required (such as coal powder humidification), the spray system will simultaneously inject water, and the mixing blades will rotate to fully wet the liquid, solid and additives.

4-3: Discharging stage

The mixed material is pushed to the discharge port for discharge. Some models use bottom door or spiral conveying structure to ensure continuous operation.