Abstract
Screw press is a kind of dehydration machines of simple structure, low cost and reliable operation and is widely used in the food processing industry. Screw assembly is the core component of screw press, the force applies on its blade is very complex and prone to failure. This study analyzed the working principle of a type continuous screw press and established mathematical model of its screw mechanism. With the help of large-scale finite element software Patran/Nastran, the screw was analyzed and stress and deformation contour were obtained. It's found that the largest stress appears on the blade root near the discharging end. This study can provides a certain theoretical basis and basic methods to design the more stable screw press.
Highlights
Press is a kind of material solid-liquid separation device widely used in food processing industry (Francis et al, 2004; Savoire et al, 2013)
The core component of screw press is the screw assembly composed of shaft and screw blades which screw pitch continuously decreases along the discharging direction, screw assembly and strainer constitute the a closed squeezing space, where the pressing process mainly carries out
The normal pressure P (MPa) blades applied on the material while working is: P
Summary
Press is a kind of material solid-liquid separation device widely used in food processing industry (Francis et al, 2004; Savoire et al, 2013). For its advantages of low cost, simple operation and compact structure (Pradhan et al, 2011; Sarkar et al, 2011). It has evident dewatering effect for fiber materials and its dehydration rate can reach 60 to 65% (Gopalakrishnan et al, 2014). Due to the actual stress situation is more complex, the strength check in the traditional sense is far from satisfying the needs of the actual design and production. Because the finite element analysis software is powerful, its result is intuitive and its analytical cost is low (Yongyong, 2014), it has been widely applied in engineering practice. The results can be used to improve the mechanism and production process of the screw, to design a screw
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