Simulation Analysis of a Single-station Jujube Pit-removing Machine
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Abstract:
Currently available triple-station jujube pit-removal machines require frequent changes of different sizes of fixtures when red jujubes of different size and variety are processed. This leads to poor adaptability, low work efficiency, and other issues. In order to solve these problems, a single-station pit-removal machine was designed based on an elastic fixture and the principle of rotational axis positioning, with a consideration of the dimensions of all kinds of jujubes and the parameters of their pits. The project included designing a novel fixture, the main transmission system, and the structure of key components. The axial positioning of red jujubes was achieved by the rotation of the lower fixture in the direction of the axis, while the design of the elasticity frame allowed the fixture to adapt to different sizes of red jujubes, thus avoiding the step of changing fixtures. A prototype model of single-station jujube pit-removal machine was built using UG software and appropriately simplified based on the structures of the components and the working principle of the pit-removal system. Subsequently, the pattern of movement and the stress conditions during operation was simulated by ADAMS virtual prototype software. Finally, a simulation with the single-station jujube pit-removal machine was carried out to validate its rationale. The results indicated that the pit-removal rate was 95%, the production yield was 91.5%, and the average rate of pulp loss was 3.75%. This jujube pit-removal machine satisfies the requirement of actual production and the pit removal rate was up to 21600 fruits per hour, which is higher than that of existing jujube pit-removal machines.
