Double Axis Mixer

A double shaft paddle mixer (also known as a double axis paddle mixer) is a piece of equipment that mixes, humidifies, and conveys powdery, granular, and viscous materials through the synchronous rotation of two spiral shafts equipped with mixing blades. Simply put, it is the machine that thoroughly blends several different materials together.

How does a double shaft paddle mixer achieve efficient mixing?

The core operating principle of a fertilizer double shaft paddle mixer lies in the synchronized, counter-rotating motion of two parallel mixing shafts. As powdered or granular materials enter the U-shaped mixing trough evenly through the inlet, the helically arranged blades on the two shafts begin to operate. During rotation, the blades propel the materials axially; simultaneously, the counter-rotation generates intense shearing, squeezing, and folding actions, causing the materials to form complex vortex-like flow patterns between the two shafts.

What are the structural components of a double shaft paddle mixer?

The main structural components of a double shaft paddle mixer include the following:

Casing: Constructed by welding steel plates and structural sections, this serves as the equipment's supporting structure. The casing is tightly sealed to effectively prevent fly ash dispersion and leakage.

Spiral Shaft Assembly: This is the core component of the mixer, comprising left- and right-hand spiral shafts, bearing housings, bearing sleeves, bearing caps, gears, sprockets, oil cups, and mixing blades. The spiral shafts require high manufacturing precision and strict fitment with the bearing assemblies.

Drive Unit: Consisting of a motor, a gearbox, and a transmission mechanism, this unit powers the two mixing shafts. Some models feature a dual-drive design that supports reversible operation and variable speed control.

Piping and Water Spray System: This includes piping for moisture-conditioning water supply and atomizing nozzles; these are arranged axially along the spiral shafts to create a water-mist curtain that evenly moistens the material.

Cover Plates and Chain Guards: These provide protection and sealing, further minimizing dust leakage.

What are the advantages of a double shaft paddle mixer?

Overall, double shaft paddle mixers offer several outstanding advantages:

High mixing efficiency and excellent uniformity. The two shafts rotate in opposite directions, creating a "weightless zone" in the overlapping area; materials move radially, circumferentially, and axially to form a compound circulation pattern, achieving uniform mixing in a short time. For some models, the coefficient of variation in mixing quality can be kept below 5%.

Multi-functional integration. A single unit performs mixing, humidification, and conveying tasks simultaneously, reducing the total number of machines and the required floor space.

Excellent sealing and environmental cleanliness. The entire mixing and conveying process takes place within an enclosed space, preventing dust leakage. The casing is tightly sealed, eliminating issues such as airborne fly ash or dust spillage.

Wear resistance and durability. The mixing blades are made of wear-resistant materials——some even feature embedded carbide tips—ensuring a long service life.

Compact structure and reliable operation. The unit features a compact design with a small footprint, smooth transmission, and low noise levels. The drive and driven shafts are machined as integral units and secured with shaft pins, ensuring high coaxiality and structural rigidity.