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Study on Parameters Optimization of Intelligent-Efficient and High Quality Concrete Mixer

Author: ZhaoShouMing
Tutor: YinXiaoQin
School: Jiangsu University
Course: Intelligent machinery and robots
Keywords: Twin-shaft mixer Mixer speed Blade mounting angle Number of stirring arm
CLC: TU642
Type: Master's thesis
Year: 2010
Downloads: 127
Quote: 0
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Abstract


Concrete as the basic building material, widely used in industry, agriculture, transportation, defense, water conservancy, municipal and civil infrastructure projects in the national economy occupies a very important position. Stirring is the key process in the concrete production process is directly related to the quality and efficiency of the production of ready-mixed concrete. The twin-shaft mixer is currently mixer mainstream models, has a small size, large capacity, reasonable structure, applicable to a wide range of mixing quality and high efficiency. Due to the agitation of the complexity of the process, on the design of the mixing device parameters, has been at home and abroad more through experimental research or practical work experience as a design basis for the lack of theoretical support on the product design cycle, technological innovation slow. In this paper, the main parameters of the mixer theoretical analysis, combined with a fluid simulation software simulation and existing experimental mixer parameter optimization. Provide a theoretical basis and technical support for the design of similar mixer type. The paper first analyzes the state of motion of the medium in the mixing process, drawn mixing parameter optimization target relationship. Mixer stirring performance criteria: to be judged by its quality of mixing the concrete mixture. Secondly the papers were the main parameters of the twin-shaft mixer several theoretical analysis and software simulation. Mainly include: mixer speed, blade mounting angle to mixing arm number, Drum aspect ratio and stirring arm arranged. Theoretical analysis of the material on the mixing blade unit phased in determining reasonable speed mixer. Materials unit is in a state of self-loading force balance analysis, to come to a reasonable speed range of the known models for less than 1.53m / s, the limiting case of up to 1.72m / s; When the material is extruded state momentum equations of fluid mechanics, and come in a variety of sizes of ordinary concrete aggregate size minimum speed. Consolidated two cases come to a reasonable speed range of the model 0.9063 to 1.72m / s. Analysis of blade installation angle, kinematic analysis of the material on the blade, knowledge engineering fluid mechanics obtained material axial and radial velocity expressions; analysis better stirring effect movement of the material characteristics obtained reasonable trajectory of the projection area of ??the material; according to the aspect ratio of the mixing drum, and seek the corresponding vane reasonable installation angle range: Wide short blade installation angle α range 29.142 ° to 32.865 °; Slim type blade The mounting angle α is in the range of about 42.168 °. And kinematic analysis of a single blade on materials, substituting a different number of values ??of the mixing arm, according to the calculated data further verify the theoretical correctness blade installation angle. Determining the number of stirring arms, through the material on the stirring blade kinematics analysis, engineering hydrodynamics related knowledge, obtain the speed of material axially and radially expression; analysis single agitation axis to promote material movement an axial length when the desired angle of rotation, according to the aspect ratio of the different mixing drum, and the rotation angle range requirement, the derived the different uniaxial phase angle corresponding the number of stirring arms; discussed separately on the different arrangement of the form of the biaxial stirring arm screening, on the basis of basic principles to meet the mixing arm and blade arrangement, and eventually come to a reasonable value. Target, the calculated aspect ratio of about 0.7 when the material used at least, combined with existing test to obtain a reasonable aspect ratio in the range of 0.7 to 1.3 in order to save manufacturing materials. Through the analysis of material flow and mixing arm arranged draw the mixing arm circumference stream arranged biaxial phase precisely staggered arrangement is more reasonable. Finally, theoretical analysis of a range of optimized parameters derived theoretically the best combination of parameters. This study is not only in-depth discussion of the stirring device parameter design, further design innovation, provides an important reference for future similar mixing equipment design and the values ??of the relevant parameters.

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CLC: > Industrial Technology > Building Science > Construction machinery and equipment > Concrete machinery and equipment > Concrete and mortar mixers, mixer
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