两自由度往复式滚筒筛茶叶筛分模拟研究

为研究两自由度往复式滚筒筛的运动和结构参数对茶叶筛分效率的影响规律,以涌溪火青茶为对象,基于离散元法运用EDEM软件在两自由度往复式滚筒筛中进行茶叶颗粒筛分模拟。研究了滚筒在往复式回转运动时滚筒倾角、往复角和往复频率对筛分过程的影响规律,得出滚筒筛的理想参数取值范围为:倾角为4~8°,往复频率为2~2.5 Hz,往复角为60~75°。进一步对滚筒施加X向振动激励,采用正交试验的方法研究激振频率、振幅、往复角、对筛分过程的影响。仿真结果表明,激振频率和往复角对筛分效率影响显著;两自由度筛分模式下,滚筒筛的理想参数为:激振频率为8 Hz,振幅为8 mm,往复角为70°。

Simulation Study on the Screening of the Reciprocating Roller Screen with Two Degrees of Freedom for Tea

Taking Yongxi Huoqing tea as research object, the EDEM based on the discrete element method was used for simulation study the influence of the kinematic and structure parameters of reciprocating roller screen with two degrees of freedom on screening efficiency for tea leaves. The effects of roller inclination, reciprocating angle and reciprocating frequency on screening was analyzed when the roller was on reciprocating rotational movement. It was found that the ideal parameters of the roller were: 4-6°(inclination), 2-2.5 Hz (reciprocating frequency) and 60-75° (reciprocating angle). Furthermore, an X-direction excitation was added to the roller screen to study the effects of excitation frequency, amplitude and reciprocating angle on the screening process by orthogonal test. The simulation results showed that the ideal parameters of the roller screen were:8 Hz (excitation frequency), 8 mm (amplitude) and 70°(reciprocating angle) under screening mode with two degrees of Freedom.