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Опубліковано: Вівторок, 26 листопада 2019, 15:23
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19. DETERMINATION OF THE PARAMETERS OF THE PIN WORKING MEMBERS OF THE DOUGH KNEADING MACHINE
https://doi.org/10.31073/foodresources2019-13-19
 
Shpak Maksym, Gavvа Oleksandr, Chepeliuk Olena, Litovchenko Igor, Chepeliuk Oleksandr
Pages: 199-206
 
Abstract
For kneading dough semi-finished products made from wheat flour, it is advisable to use pin working members that provide the desired result both at the mixing stage of the components and at the stage of plasticization. But their configuration and operating modes need justification. A new design of a pin kneading member is proposed, which is a shaft with three cylindrical pins welded to it, located on the vertices of a triangle, with one of the pins having a diameter several times larger than the diameters of the other two. To find the relationship between the independent variables (design parameters and the rotation speed of the kneading member) and the objective function – the bread dough viscosity – a full factorial experiment, taking into account nonlinearity and inter-factor interactions, was planned and implemented. The study was performed by simulation method in the FlowVision licensed software complex. The simulation takes into account the properties of the dough as a pseudoplastic fluid whose viscosity and flow index are velocity dependent. The optimization problem – finding the minimum dough viscosity – has been solved analytically. When kneading the dough at the plasticization stage, it is necessary to ensure the creation of circulating vortices. The most favorable areas of their formation are those where the product velocity is the highest and the viscosity, respectively, the lowest. To obtain the lowest values of viscosity in the process of dough kneading by working members of the pin type, the distance between the pins should be 0.02 m and 0.019 m, and their diameters – 0.014 m and 0.005 m. Also, at the stage of dough plasticization, it is advisable to ensure the kneading member rotation in such a way that the flow of dough first came on the pins of smaller diameter, which have low resistance to movement. At the same time, a low viscosity zone occurs in a large area of the product, in which a large diameter pin moves. It undergoes less resistance to movement, thus creating more vortices at relatively lower energy consumption

Keywords: kneading, dough, viscosity, working member, pin, geometric parameters, rotation speed
 
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