Design of Drilling Parameter Monitoring System for Mining Drilling Rig Based on PLC and LabVIEW
In order to monitor the process parameters of hydraulic drilling rig in real time and realise the monitoring of working conditions during the drilling process of the drilling rig,a drilling parameter monitoring system for mining drilling rig based on PLC as the control core was designed.The drilling parameter monitoring system had the functions of automatic display,acquisi-tion,recording,processing and working condition identification of drilling parameters,etc.The key technologies such as hardware sensor selection and principle,explosion-proof design and software design based on LabVIEW development were introduced in de-tail.By conducting indoor performance test comparison experiments on the rig performance test platform,and building similar ex-perimental platforms to carry out on-well simulation experiments,and analysing the monitored data,the experimental results show that in the performance test comparison experiments,the measurement error of torque is about 0.069%,the measurement error of rotational speed is 0.014 75%,and the measurement error of drilling pressure is 0.063 8%,and the measurement errors of drillingparameter monitoring system are all less than 0.12%,which verifies the accuracy and reliability of the drilling parameter monitoring system.In the well simulation test,when the drill bit encounters the rock layer with large hardness,the resistance of the drill bit rotating and crushing increases,and then the values of the torque and drilling pressure become larger,and the values of the drilling speed and rotational speed decrease,when the drill bit encounters the soft coal layer with small hardness,the resistance of the drill bit rotating and crushing decreases,the values of the torque and drilling pressure decrease,and the values of the drilling speed and rotational speed increase.The design of this system lays a foundation for the automation and intelligent de-velopment of underground drilling equipment in coal mines.
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