关键词: 梳棉机, 数值模拟, 计算流体力学, 气流分析, 滤尘

Abstract: "The carding machine is one of the key equipments in the spinning process, and its internal airflow movement law directly affects the combing effect, card sliver quality and production efficiency. However, most previous studies have focused on specific components of carding machines, leaving significant gaps in understanding airflow behavior across the entire machine structure. This study investigates the JWF1217 carding machine through numerical simulations and operational testing, aiming to comprehensively analyze its internal airflow patterns so as to provide theoretical basis for the structural optimization and performance improvement of the carding machines. In numerical simulation, firstly, the fluid domain model of carding machine was established by using ANSYS Workbench software. In the process of modeling, geometric features such as fillets, chamfers, and bosses, which have less influence on the air flow, were appropriately simplified. Meanwhile, the depth of the needle cloth of each working part was fully considered to ensure the accuracy of the model. Then, the fluid domain model was divided into structured tetrahedral grids, and the boundary conditions of the inlet and outlet of the airflow were reasonably set, and then the standard k-ε turbulence model was selected for simulation. The fluid domain was then meshed with structured tetrahedral grids, with appropriate boundary conditions defined for the airflow inlets and outlets, followed by simulation using the standard k-ε turbulence model. In order to verify the accuracy of the numerical simulation results, the actual operation test was carried out and compared with the numerical simulation results. The simulation results reveal the main components of the airflow in the carding machine, including the airflow generated by the rotation of the working roll, the airflow sucked by the dust filter pipe, and the external airflow intake. At the same time, the simulation results also show the distribution of the airflow pressure field and velocity field in the whole carding machine, dust filtering area and carding area. The results show that the overall pressure distribution inside the carding machine is appropriate. The pressure decreases along the X direction at the cotton mesh cleaner, the cylinder undercasing and the falling area, which is beneficial to the short fiber and dust to enter the dust filter pipe with the air flow. The pressure in the dust filter pipe decreases from bottom to top and from outside to inside, the pressure drop is stable without abrupt changes, the negative pressure utilization rate is high and the energy loss is low, which is conducive to removing dust. Vortices are observed in the licker-in falling of the main carding region. Downward airflow promotes impurity removal, while upward airflow supports fiber alignment, ensuring stable carding performance. In the cylinder-revolving flat interface, the airflow effect is dominant near the suction point of the dust filter pipe, while the mechanical effect is more significant away from the suction point. In the cylinder-doffer triangle area, the airflow on the surface of the cylinder and the doffer is relatively independent and does not interfere with each other, which is beneficial to reduce the mutual entanglement and damage between the fibers. The experimental results show that the numerical simulation results are basically consistent with the experimental measurements, which verifies the reliability and accuracy of the numerical simulation method."

Key words: carding machine, numerical simulation, CFD, airflow analysis, dust filter