variable pitch
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The parameters of a wheat flour equal-pitch screw feeder are mainly based on empirical design. A method comparing the effect of the number of blocked zones on the feeding sections is proposed to complete the screw parameter of four feeding sections. According to the designed screw structure, Solid Works was used to build the three-dimensional model, and EDEM software was imported for discrete element analysis. It is found that the optimal solution is the screw design with two blocked zones, in which the cutting stock of the feeding sections is very uniform with high feeding accuracy on the premise of satisfying the screw feeding. In order to verify the rationality of the design of the screw structure, the screw was processed based on the optimal parameters, and the screw feeding device of the transparent outer cylinder was built with acrylic plate, and then the feeding stability of wheat flour was observed. The flow fluctuation of the designed screw is relatively small, and the feeding is more uniform, so the accuracy of the screw feed is higher. The experiment verifies the rationality of the variable pitch design and provides a reference for the design and development of wheat flour screw feeding device.