Abstract:Intelligent and green is the current development trend of agricultural environmental protection equipment. In order to achieve long-term stable and efficient operation of spiral extrusion solid-liquid separator and reduce labor cost, a set of adaptive discharge end pressure device and its automatic control system was developed, which can automatically adjust the size of the outlet according to the change of outlet pressure. The contact curve of the pressure valve was designed based on the principle of bionics, and the structure of the pressure valve at the discharge port was optimized by combining discrete elements with experiments. The contact parameters of cow dung were calibrated through friction characteristic test and collision test, and the discrete element model of cow dung particles in the process of spiral extrusion dehydration was established. Comparing the opening size of the pressure valve and the mass flow rate of the discharge port, three kinds of pressure valves with different structures were selected. Through orthogonal test, the influences of pressure valve structure, initial pressure at discharge end and rotation speed of spiral shaft on separation efficiency, moisture content of solid after separation and effective energy consumption of the machine were studied. The results showed that under the bionic (vole claw toe) secondary fitting pressure valve, the initial pressure at discharge end of the test prototype was 1000N and rotation speed of spiral shaft was 60r/min. The separation efficiency reached 2279.76kg/h, the moisture content of cow manure was 58.73%, the effective power was 2.83kW, the separation efficiency was the highest, the energy consumption per ton of cow manure was the lowest, and the effective power was reduced by 30% compared with that before optimization.
