采煤机是综合机械化采煤的重要设备，滚筒承担着落煤、装煤等任务。为了适应难开采煤层的恶劣工作环境、提高生产效率，本文以MG800/2040WD型采煤机截割滚筒为研究对象，设计一种新型采煤机振动截割滚筒，对其结构进行疲劳寿命分析以及基于刚柔耦合的动力学特性分析。主要完成工作如下：

（1）分析采煤机结构和工作原理，基于应力波煤岩破碎机理，提出振动截割采煤机滚筒实现原理，在此基础上建立振动截割采煤机滚筒煤岩破碎力学模型。

（2）以MG800/2040WD型采煤机截割滚筒为原型，利用MATLAB软件对该机型振动截割滚筒偏心振动机构进行优化设计，并采用SolidWorks软件建立了振动截割滚筒关键零部件三维几何模型和虚拟样机模型，并进行装配干涉检验。

（3）建立振动截割行星轮系力学模型，分析额定工况下振动截割行星轮系中行星架和行星齿轮与太阳轮的等效应力和应变，在恒定振幅载荷作用下，对振动截割行星减速器以及行星架分别进行疲劳寿命分析。

（4）运用COMSOL软件对振动截割滚筒行星架分别进行刚性和刚柔耦合模态分析，分别得到其前六阶振动频率和振型，并对比分析振动截割滚筒刚性模型和刚柔耦合模型各阶模态振型特征，得到振动截割行星减速器发生共振的最小频率，表明本设计的合理性。

本研究为提高采煤机截割效率，提升截割滚筒的可靠性和使用寿命奠定了基础，可为连续采煤机振动截割滚筒研究提供理论指导和技术支撑。

Shearer is an important equipment in comprehensive mechanized coal mining technology. Drum is the key component of shearer cutting department, which undertakes the tasks of landing coal, loading coal and spraying dust.  In order to adapt to the harsh working environment of difficult-to-mine coal seam and improve production efficiency, this paper designs a new type of shearer vibration cutting drum based on the existing shearer drum, taking the cutting drum of MG800/2040WD shearer as the research object, and analyzes the fatigue life of its structure and dynamic characteristics based on rigid-flexible coupling.  The main tasks are as follows:

(1) The structure and working principle of the shearer are analyzed, the existing mechanism of coal and rock breaking is summarized, the mechanism of vibration cutting shearer breaking coal and rock based on stress wave is analyzed, and the structural schematic diagram of vibration cutting drum is put forward. On this basis, the mechanical model of coal and rock breaking by cutting drum of shearer is established.

(2) Based on MG800/2040WD shearer cutting drum, the eccentric mechanism of vibration cutting drum vibrator was optimized by MATLAB software. SolidWorks software was used to establish the three-dimensional geometric model and virtual prototype model of key components of vibration cutting drum, and interference test was carried out.

(3) The mechanical model of the vibration cutting planetary gear train is established, and the equivalent stress and strain of the planet carrier, planet gear and sun gear in the vibration cutting planetary gear train under rated working conditions are analyzed. Under the action of constant amplitude load, the fatigue life of the vibration cutting planetary reducer system and planet carrier are analyzed respectively.

(4) The rigid and rigid-flexible coupling modal analysis of the planetary carrier of the vibration cutting drum is carried out by using COMSOL software respectively, and the first six vibration frequencies and modes are obtained respectively, and the modal mode characteristics of the rigid-flexible coupling model and the rigid model of the vibration cutting drum are compared and analyzed.

This study has laid a foundation for improving the cutting efficiency of shearer, improving the reliability and service life of cutting drum, and also provides theoretical guidance and technical support for further research on vibration cutting drum of continuous shearer.