随着中厚煤层不断开采完毕，薄煤层开采比重将不断加大，其安全、高效开采日显重要，但由于开采空间有限、条件恶劣，采煤机易出现设计结构不合理、工作状态不稳定、可靠性差等问题。以MG2*100/455-BWD新型薄煤层采煤机截割部为工程对象，采用Pro/E，ANSYS，ADAMS建立了该采煤机的刚柔耦合虚拟样机模型，基于破煤理论建立了采煤机螺旋滚筒的力学模型，通过MATLAB编制了相关程序解决了刚柔耦合虚拟样机模型载荷添加的问题;通过虚拟仿真获取了关键零件输出轴、壳体、行星架的Von Mises应力分布及最大应力节点应力值的时域信息，以30组不同牵引速度仿真模型的仿真结果建立了各关键零件的最大应力分布函数;以应力-强度干涉可靠性理论为基础，结合各关键零件的最大应力分布函数及所用材料强度分布函数，在考虑载荷作用次数情况下，建立各关键零件在随机载荷多次作用下的可靠度计算模型。经分析计算得到输出轴、行星架、壳体的可靠度分别为0.978，0.536及0.614，研究发现:行星架与壳体存在应力集中现象，应力最大位置分别位于行星架腹板与花键轴相交处及壳体惰轮轴孔后侧与行星减速器承载部分相交处。在对薄弱零件改进后，行星架、壳体的可靠度分别达到0.9690和0.9974，满足使用要求。该方法可有效缩短产品设计周期，提高采煤机关键零件的设计质量及可靠性。

With the completion of medium-thick seam mining gradually,the proportion of thin seam mining will contin- ue to increase,and its safe and efficient mining is becoming increasingly important. Due to the limitation of mining space and harsh conditions,the shearer is prone to the problems of unreasonable structure design,instability and poor reliability. Taking new thin coal seam shearer of MG2∗100 / 455-BWD cutting parts as an investigation target,the rigid flexible coupling virtual prototype model of the shearer was established by Pro / E,ANSYS and ADAMS. The mechani- cal model of shearer spiral drum was established based on coal breaking theory. The problem of load addition of rigid-flexible coupling virtual prototype model was solved by programming with MATLAB. The maximum stress nodes’ time- domain information and Von Mises stress distribution of output shaft,shell and planetary carrier were obtained by virtu- al simulation. Based on the simulation results of 30 sets simulation models for different hauling speeds,the maximum stress distribution function of each key part was established. Based on the reliability theory of stress-strength interfer- ence,combined with the maximum stress distribution function of each key part and the strength distribution function of the material used,the reliability calculation model of each key part under multiple random loads was established con- sidering the cycle of loads. The reliabilities of output shaft,planet carrier and shell were cal-culated as 0. 978,0. 536 and 0. 614 respectively. The results show that the stress concentration phenomena exist on planetary carrier and shell. The maximum stress locates at the intersection of web and spline shaft of planetary carrier,and at the intersection of backside of idler shaft hole and outside of planetary reducer of the shell,respectively. After the improvement of the weak parts,the reliability of the planet carrier and shell are 0. 969 and 0. 9974 respectively,which can meet the opera- tion requirement. This method can effectively shorten the product design cycle and improve the design quality and reli- ability of the key parts of shearer.