Research On Load Monitoring System Of Mine Hoist

As the transportation equipment connecting the underground and ground,the mine hoist is mainly responsible for the lifting of coal in the main shaft,the lifting of auxiliary shaft production personnel and equipment,and the lowering of materials.It is known as the "throat" of coal mine production.During the operation of the hoist,faults such as unbalanced tension,stuck cans,overload,and incomplete unloading can cause abnormal changes in the tension and lifting load of the steel wire rope,affecting the safe operation of the hoist system.Therefore,it is necessary to monitor and diagnose the tension and lifting load of the steel wire rope.Therefore,based on practical application,this article designs a monitoring system for the tension and load of the steel wire rope of a mine hoist,which has important practical significance for improving the safety of the hoisting system operation.The main research content of this article is as follows:Firstly,the tension characteristics of the steel wire rope during the operation of the mine hoist are studied.Without considering the vibration and impact of the steel wire rope,the quasi static tension at any point on the lifting steel wire rope was analyzed,and the maximum value was calculated to provide a basis for sensor selection and design;Ignoring the influence of transverse Torsional vibration,the dynamic model of the longitudinal vibration of the hoist wire rope is established.The simulation model is built using Matlab/Simulink,and the dynamic tension curve during the operation of the hoist is obtained combining with the actual parameters on site;Based on the Control variates,the influence of operation parameters on the longitudinal vibration and dynamic tension of wire rope is studied.Secondly,a wireless monitoring system was constructed with a microcontroller as the lower computer,an industrial control computer as the upper computer,and point-to-point communication.Based on the on-site working conditions and coal mine safety requirements,the hardware system is selected and designed,including five parts: main control module,wireless signal transmission module,power module,sensor protection shell,and electrical explosion-proof shell.In the software design,the lower computer wrote the driver program for STM32 based on the Keil development environment,and ported the Free RTOS operating system and Modbus RTU communication protocol;The upper computer is developed based on King View for human-machine interaction interface,which can achieve functions such as data display,fault diagnosis,and data storage.In addition,error analysis is conducted on the monitoring system and corresponding error compensation methods are provided to improve the accuracy of the monitoring system.At the same time,reliability analysis of the monitoring system is conducted based on Markov models.Finally,the designed monitoring system will be applied and analyzed on site.Calibrate the sensor using regression analysis and least squares methods,and complete hardware installation based on actual operating conditions.Using the median average filtering algorithm,real-time filtering processing is carried out on the collected signal to reduce noise and other interference,and achieve more accurate tension measurement.The feasibility and accuracy of the monitoring system were verified by comparing the weight changes of the quantitative bucket and tail rope with the measured data.The thesis has 72 diagrams,20 tables,and 83 references.