为实现煤矿井下综采工作面复杂电磁环境下采煤机滚筒高度的测量，保证工况条件下传感器的可靠性，在分析滚筒式采煤机摇臂结构和工作原理的基础上，利用TLE5012B磁敏感角度传感元件设计了采煤机滚筒高度传感器。传感器通过安装于摇臂销轴处的摇杆—旋转装置获取摇臂摆角，由角度计算获得采煤机滚筒高度。依据现有煤矿井下工况条件、设备分布以及传感器安装位置，分析确定滚筒高度传感器在井下工作环境中的主要磁场干扰源为采煤机的截割电机、破碎电机、牵引电机以及采煤机供电电缆和巷道铺设电缆。采用SolidWorks三维建模软件，以Eickhoff公司的SL1000型采煤机为参照，建立相关电缆、电动机、采煤机摇臂及周边部分等干扰源模型。采用COMSOL Multiphysics仿真软件，求解各干扰源模型的磁场分布，并对采煤机滚筒高度传感器工作位置的磁场环境进行了定量分析。仿真结果表明：截割电机及巷道铺设电缆处的磁感应强度较大，是影响传感器工作的主要电磁干扰源。采煤机摇臂及周边部位和传感器安装部位的磁感应强度为1～4 T，超出了TLE5012B的30～50 mT正常工作范围。为减小电磁干扰对传感器的影响，基于低频磁屏蔽原理及传感器结构，以硅钢片为屏蔽材料设计了磁屏蔽装置，该装置可有效屏蔽99%的磁场干扰，屏蔽后传感器周围磁感应强度为10～45 mT。

In order to realize the measurement of the height of the shearer drum in the complex electromagnetic environment of the fully mechanized mining face in the coal mine and ensure the reliability of the sensor under the working conditions,on the basis of analyzing the structure and working principle of the rocker arm of the drum shearer,the shearer drum height sensor was designed by using TLE5012B magnetic sensitive angle sensor element. The sensor obtains the swing angle of the rocker arm through the rocker-rotating device installed at the rocker pin shaft,and calculates the height of shearer drum from the angle calculation. According to the existing coal mine underground working conditions,equipment distribution and sensor installation position,the main magnetic field interference sources of drum height sensor in the underground working environment were analyzed and determined to be cutting motor,crushing motor,traction motor of shearer,power supply of the shearer and roadway laying cables. Using Solidworks 3D modeling software and taking Eickhoff’s SL1000 shearer as a reference,the related interference source models such as cables,motors,shearer rocker arms and surrounding parts were established. Based on COMSOL Multiphysics simulation software,the magnetic field distribution of each interference source model was solved,and the magnetic field environment of shearer drum height sensor working position was quantitatively analyzed. The simulation results show that the magnetic induction intensity of the cutting motor and the roadway laying cable is relatively large,which is the main source of electromagnetic interference affecting the work of the sensor. The magnetic induction intensity of shearer rocker arm and its surrounding parts and the sensor installation parts is 1-4 T,which is beyond the normal operating range of 30-50 mT of TLE5012B. In order to reduce the influence of electromagnetic interference on the sensor,based on the principle of low-frequency magnetic shielding and sensor structure,a magnetic shielding device was designed with silicon steel sheet as shielding material. The device can effectively shield 99% of the magnetic field interference,and the magnetic induction intensity around the sensor after shielding is 10-45 mT.