Mechanism analysis and parameter optimization of unloading paddle device for pig-feeder

To improve the working performance of feeders in pig breeding industry in our country, a feeding device with unloading paddle for pig-feeder was designed, and the mechanism analysis and physical experiments were conducted. Through the theoretical analysis and discrete element simulation of the main structures of device, the structures of the inclined arch-destroying unit with rods and ropes and the paddle-unloading unit were established. Base on the stable discharge, the main affecting factors on discharge performance of the device with unloading paddle were determined with the rotational speed of paddle, the exit distance and the largest backward angle of paddle as experimental factors. The discharge rate and the discharge uniformity represented by variation coefficient were chosen as evaluative indicators to obtain the optimal parameter combination. The experiment results show that with the filling rate of 80%, the paddle rotational speed of 55.5 r·min^-1, the exit distance of 14.5 mm and the largest paddle backward angle of 31.5°, the discharge rate and the variation coefficient are 166.75 g·s^-1 and 4.39%, respectively. The continuous and steady flow without arch formation in the hopper is realized under the action of arch-destroying, and the fine particles in the feeding trough are uniformly distributed, which is conducive to improve feeding performance of feeder.