Projeto de uma peneira vibratória para classificação de noz pecã

Abstract

With the growth of agro industries in pecan nut beneficiation sector and the low avaibility of existing technologies today in Brazil, it is necessary to study new techniques for the pecan nut processing sector. The processing of nuts consists of three main steps: hulling of the fruit, separating peel and almond and their classification. In the current scenario, such steps are peprformed with low automation, resulting in a loss of product quality and high processing costs, thus, there is a need for automating the processing of pecan. In this context, this study aims to develop the design of a vibrating screen able to sort almonds in four grading levels, aimed at automation of the stages of pecan nut processing, as well as reducing processing costs therof. The methodology of this project is based on the following steps: literature review, consultation existing types of vibrating screens, determining the parameters, machine design, analytical dimensioning, analysis of the vibration mode using finite element, selection and specification of machine elements and the realization of the project of the memorial, submitted with the development of the same. The projected vibrating screen is inclined at an angle of approximately 10, driven by vibrator motor and its vibrating system is by circular movement. The project carried out allows almonds classification in four grain sizes (whole almonds, halved ¼ of its size and smashed almonds), the mesh size of the screening media are square and stainless steel wire manufactured AISI 304. During the development of the project could be concluded that the parameters initially adopted were satisfactory, the vibrating screen has met the design requirements, with reliable safety factors in the design of machine elements and finite element analysis was satisfactory, demonstrating that machine features rigidity and there is no failure risk for resonance.