Design Of Ladle Hook Attitude Monitoring System

Bridge cranes are widely used in material handling in the factory building,among which ladle cranes are used for lifting and handling ladle in the steel smelting workshop to complete the steel smelting process.The ladle crane uses the hook to hook the ladle trunnion to complete the operation.Due to the closed steel smelting workshop,the dark light,and the dust,the crane driver and ground commanders have limited vision.If the crane fails to detect in time that the hook does not hook the ladle trunnion before lifting,it will cause the ladle to overturn and cause an accident.Therefore,the design of a safety monitoring system for ladle hooks is of great significance to the safe production of steel smelting workshops.In order to solve the above problems,a monitoring system with low delay,low power consumption,high precision and high reliability was designed based on the attitude of the ladle hook.According to the hook lifting principle of the ladle crane,the overall plan of the monitoring system is designed.The overall plan design of the monitoring system includes the design of the lower computer and the design of the upper computer.Based on the three-axis accelerometer and the STM32 minimum system board,the lower computer circuit of the system is designed.The hardware design of the lower computer has completed the selection of sensors,single-chip computers,wireless transmission modules,power modules and level conversion modules,and the design of circuit boards and shell packaging.It realizes the functions of data collection,wired and wireless network combined communication,and protection of the lower computer.The embedded program of the lower computer controls the mutual conversion between the working mode and the sleep mode of the slave,theoretically reducing the power consumption of the slave,and completing the formulation of the data transmission protocol and the preliminary analysis of the data.The upper computer of the system is designed based on Lab VIEW,the serial port module is configured according to the interface parameters of the lifting system and the lower computer,and the operation of the monitoring system is triggered by the lifting data.According to the data format of the lower computer,intercept the characters of the three-axis acceleration of the hook,calculate the three-axis acceleration characters in the complement code format,and then calculate the attitude angle value through the trigonometric function.Designed the system installation plan and work flow,completed the high-temperature static drift experiment and workshop experiment,and designed the filtering method to reduce the noise of the workshop experiment data.The high temperature static drift experiment results show that in a complete transportation cycle of the crane,the drift amount of slave A of the monitoring system is 0.32°,the drift amount of slave B is 0.11°,and the system angle difference discrimination accuracy is 0.5°,which meets the system monitoring requirements.Workshop experiment results show that when the monitoring system angle and the angle difference threshold are set to 5°,the hook status of the hook can be judged.The experimental data after the noise reduction process shows that the filtering method improves the stability and reliability of the monitoring system and can adapt to the environment of the smelting workshop.