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In the process of industrial sand-blasting, it is necessary to recycle the pellet. In order to solve the existing problems such as high cost, vulnerability, maintenance difficulty and low recycle efficiency in pneumatic recycling system and mechanical recycling system of pellet, we designed a trapezoidal scraper recycle system of pellet which powered by the cylinder and controlled by PLC to realize the pellet collection. The core component of the system is the scraper mechanical structure which mainly composed of scraper, scraper cylinder, baffle, scraper frame, bearing. This design has the advantages such as simple structure, resistant to breakdown, easy dismantlement. By installing pneumatic valve on the cylinder, the sand scraping speed can be adjusted. The trapezoidal scraper pellet recycling system efficiency is much higher after the contrast experiments between trapezoidal scraper and mechanical screw conveyor of the original equipment. Keywords-Pellet; Cylinder; PLC; Scraper; Trapezoid

Design of Pellet Recycle Scraper System in Sand-Blasting Chamber