272 Figure 5—Head and middle drive collaborative control strategy PERFORMANCE DESIGN AND OPTIMIZATION FOR KEY COMPONENTS Mechanism Of Low Resistance And Long Service Life Of Rollers The breakthrough of the whole machine performance depends on the technical upgrading and optimization of key components. Based on the theory of tribology and fluid mechanics, aiming at the problems of poor sealing, high resistance and short service life in the harsh underground environment of the traditional idler, a solution combining low viscosity nano magnetic fluid with field induced structure control is proposed, and a non-contact sealing structure of hydrophilic silica nano magnetic fluid is developed. The performance test results are shown in Figure 6. The structure realizes the dual optimization of the rotation resistance and sealing performance, the rotation resistance of the idler is reduced by 28%, and the energy consumption of the whole machine is reduced by 5%, the sealing performance is improved by 26%, and the service life is more than 30000 hours. Figure 6-(a) Magnetic fluid non-contact sealing idler and (b) performance test of idlers Intelligent Stepper-type Belt Tensioning Device To solve the problems of difficult maintenance of head drum and conveyor belt, high risk and low efficiency of manual loosening, an intelligent step-by-step loosening device is developed. The prototype device is shown in Figure 7.
RkJQdWJsaXNoZXIy MTM0Mzk2