Twin Shaft Batch Mixers

The twin-shaft batch mixer has become a preferred technology for concrete production in many countries. This mixer is used to replace manual mixing with a shovel in which a line of aggregate, cement, and water positioned on the ground, was repeatedly shoveled from right to left. This concept was later abandoned and over a number of development stages, was replaced by today’s highly dynamic movement process.

twin-shaft batch mixer

Operation Principles

• Generation of a circular three-dimensional movement of the whole mixture
• Intensive material exchange in the turbulent overlap area of the two mixing circles
• Optimal utilization of the energy input into intensive relative movements of the mixture
• Inclusion of the whole material volume in the mixing process at any time of the process

Advantages

Consistent high level of homogeneous mixture within rapid mix cycles

• Homogeneous mixture levels of 95% are achievable within 30 seconds
• Batch after batch the mixers produce high level uniform and homogeneous mixtures
• The mixing techniques preserve the grain structure of the individual recipe components

High energy efficiency

• High mixture performance is achieved at low speeds
• Reduced energy consumption due to short mixing cycles, effectiveness of mixing tools and efficiency of drive units

Low-wear

• Minimal wear of mixing tools and trough liners achieved from relatively low mixing speed and mixer compact design
• Reduced wear compared to pan or planetary mixers
• All wear parts have been optimized and designed for longevity

Efficient concrete production

• Fast and optimal use of cement and other binders
• Potential for saving of cement and other binders
• Consistent and fast distribution of additives and admixtures throughout the whole mixture volume
• Batch to batch consistency for every mixing cycle
• Minimum batch filling levels of 10% are possible
• Guranteed future-proof in view of new concrete recipes (SCC, UHPC, etc.)
• Hybrid mixing cycles possible (slow – fast – slow)