نوع مقاله : مقاله مکانیک
نویسنده
دانشیار، گروه مهندسی بیوسیستم، واحد اصفهان، دانشگاه آزاد اسلامی، اصفهان، ایران.
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسنده [English]
Tractor front end loaders are one of the widely used tools in civil and agricultural operations such as moving, conveying and loading civil materials and agricultural products. Manufacturers of road and agricultural machinery in Iran, in order to use the capabilities of tractors, have tried to manufacture and install hydraulic loader on tractors. Existing loaders have limitations such as creating a floating mode for the loader and the simultaneous use of two handles by the operator. Therefore, the main objective of this research is to replace a new hydraulic system in order to add floating mode to the loader and more precise control of the cylinders by one handle. For this purpose, first a behavior prediction model for determining the speed of the cylinders in terms of flow rate and pressure was extracted and verified using the response surface method. Then, the hydraulic system was designed using two approaches: using a fully hydraulic circuit and an electrohydraulic circuit approach. FluidSIM4.2 software was used for design and simulation. Position and velocity diagrams related to different cylinder stimulation modes were drawn. Validation of the simulation process was done by comparing the simulation results and mathematical calculations. The results showed that the presented model has high accuracy (R2=0.92) for predicting cylinder speeds. The new design is able to perform all vertical and angling movements of the loader correctly. Also, by adding a quick drop valve to the hydraulic circuit of the boom, the opening velocity of the boom cylinder increased by 17%.
کلیدواژهها [English]
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