联合收获机螺栓运行状态重构方法及系统开发OA

Loosening of bolts in combine harvesters can cause equipment failures,leading to safety hazards,and economic losses.Real-time monitoring of bolt tightening force is crucial for improving equipment reliability.A method for reconstructing the operational status of bolts based on the principle of resistance strain is presented,and an intelligent monitoring system is developed for bolt tightening force.First,the structure of a bolt-compressed gasket sensor is designed,and a signal acquisition,processing,and communication circuit based on STM32 microcontroller and LoRa wireless transmission technology is constructed.The software subsystems for upper and lower computers are developed.Force data of the sensitive body within the range of 0～150 kN are collected through bench tests.Linear regression and M5P algorithms are used to establish calibration models.Test results show that the M5P model achieves a correlation coefficient of 0.999 8,an average absolute error of 0.66 kN,and a relative error of 1.91%,with significantly higher accuracy than the linear regression model.The system is integrated into a combine harvester for field verification,and the results show that the system can monitor the bolt tightening force in real-time and dynamically display it through the upper computer interface.The device is compact,easy to install,and avoids cumbersome wiring through wireless transmission.The research provides a practical solution for monitoring bolt tightening force in combine harvesters,contributing to the improvement of intelligent level and reliability of domestic agricultural machinery equipment.