Rediseño y automatización de un equipo triturador de botellas plásticas tipo PET.

Abstract

Redisign and automate a plastic PET bottle crushing equipment. This work contains the information of the redesign process of a size reducer for PET plastic. The Project includes the study of the characteristics of the original equipment until obtaining an improved equipment. The improvements proposed for the equipment include automation, and the change in the way the material is cut. For the mechanical redesign, the cuting system was changed to a matrix of sawsto one by blades on parallel axes. It went from a cut by conversation of kinetic energy into load for breaking the material, to one that prevails the torque for the breaking off. In the process, it was necessary to carry out several design calculations, both mechanical, going a bit into the área of mechanical engineering (with mechanical advice). The resul was a much more suitable cutting system with a particle diameter between 0.5-2 cm, compared to the previous 3-5 cm. Among the changes is: design of blades, axes and separators, blade camera design, transmission system, selection of reducer motor system and control system. Among the most outstanding results is the retention percentage of 35% and the diameter distribution of particles of which 80%are above a 5mm mesh. In the control system by that percentage of retention in the system of cutting the material, it was necessary to modify the control to allow the investment of rotation of the engine, with the objective of removing the material retained, which causes the equipment to stop. We recommend that during the use of the equipment, the instructions presented in the manuals must be followed. The equipment is designed for plastic material and materials with a similar hardness range.