DESIGN AND EXPERIMENTAL STUDY ON TWIN-SCREW STRAW PULPING MACHINE

Despite the abundance of agricultural straw as a renewable resource, its low utilization efficiency remains a significant challenge due to inadequate mechanical processing methods. To solve the problem, the ANSYS finite element simulation software was employed to simulate and analyze two screw configurations (parallel and staggered arrangement) and four compression zone designs. The optimal coupling breaking method was determined to be the parallel type with a 2-2-2 compression zone combination for the twin-screw system. Based on the simulation results, a twin-screw straw pulping machine was constructed. The test factors included screw speed, thread pitch, and straw moisture content, with straw breaking rate as the test index. Simulation test was conducted to optimize the structural parameters of the twin-screw straw pulping machine, followed by a verification test. The results indicated that at a screw speed of 120 r/min, a thread pitch of 203 mm, and a straw moisture content of 60%, the straw breaking rate was the highest at 79.9%. The verification test results were consistent with the simulation results, with less than 5% deviation, confirming the reliability of the simulation model and optimization outcomes. This paper provides a basis for the design and optimization of twin-screw pulping machines and offers theoretical support for the high-value utilization of agricultural waste through enhanced mechanical processing technologies.