Determination of Design Parameters for Horizontal Rotary Crushers for Feed Grain

Abstract

A horizontal impact crusher provides for high­quality grinding of grain materials and getting the finished product equalized by particle size distribution to 98 percent. The effectiveness of the crusher is determined by the following parameters: rotor speed, operating clearance, intensity and full filling of the crushing chamber, the duration of impact on the original product, the design features of the working bodies and the geometric design of their corrugated surfaces. (Research purpose) To determine the design parameters of a horizontal rotary crusher for feed grains. (Materials and methods) The influence of the stator flute number on the quality of the crushed product has been studied by three indicators: the grinding degree, the grinding module, the actual effectiveness of the grinding process. It has been found that as the flute number increases, the grinding module and the degree of grinding change insignificantly, and the actual effectiveness of grinding decreases. In this case, the finished product corresponds to coarse grinding. A comparative experiment has been conducted with two design variants of the working surfaces with one stator contradiction to check the effectiveness of changing the shape of the rotor and stator flutes. (Results and discussion) It has been determined that the geometrical parameters of flute working elements of a horizontal rotary crusher can be calculated using the proposed model of theoretical calculation based on the type of material crushed and zootechnic requirements. An angular shape of the rotor grooves also has a positive effect on the overall performance of the grinding process. (Conclusions) The authors present theoretical substantiation of the design features of cutting flute working surfaces of a horizontal rotary crusher and the calculation of the rotor diameter. They have proposed a model for calculating these parameters basing on the type of crushed grain crops. They have experimentally compared various design forms and the number of stator contradictions with respect to the quality of the products obtained. The main manufacturing parameters of rotor grooves have been calculated for the most common grain crops (wheat, barley, oats, and corn) and their optimal values have been theoretically substantiated.

Keywords

• impact crusher
• grinding of grain materials
• corrugated working surface
• rotor
• stator