In the field of concrete mixing equipment technology, twin-shaft mixers have become a common model in large-scale infrastructure projects due to their forced convection mixing principle. The drum, as the core load-bearing component of the mixer, has design parameters whose rationality directly affects the equipment's performance. Research by Qingdao Dikai Research Institute found that the drum's width-to-diameter ratio, as one of the fundamental design parameters, significantly influences material circulation speed and mixing efficiency.
The working principle of the twin-shaft mixer relies on dual-axis blades to push the material, creating convection currents while inducing radial and axial displacement. During this process, the blades shear and knead the material. Traditional designs often employ slender cylindrical bodies, which, while increasing the material's movement path, also significantly prolong its residence time in the mixing chamber. This not only reduces mixing efficiency but also tends to create a "dead zone" with material accumulation at the cylinder ends, compromising overall mixing uniformity.
After extensive research and practical application validation, the wide-short cylindrical body design with a higher width-to-diameter ratio demonstrates better suitability for the performance characteristics of twin-shaft concrete mixers. The wide-short design effectively reduces the axial travel distance required for macroscopic material homogenization while significantly enhancing the material exchange frequency between the two shafts. This creates a larger overlapping mixing zone in the axial center area of the mixer, increasing the number of material circulation cycles per unit time.
This design can directly enhance the mixing efficiency of materials without increasing the stirring time, while also alleviating material accumulation at the cylinder ends and reducing the formation of dead zones, ensuring that materials in all regions of the cylinder participate in the circulating stirring process.
For the design of twin-shaft concrete mixers, the setting of the width-to-diameter ratio is not a single fixed value but requires rational matching based on the equipment's application conditions and the characteristics of the mixed materials. A scientifically designed width-to-diameter ratio serves as the foundation for ensuring material circulation efficiency and the prerequisite for optimizing subsequent cylinder design parameters. Only by mastering this fundamental parameter can the high-efficiency operation of twin-shaft concrete mixers be effectively secured.