Study Of The Real-Time Monitoring And Security Of Multi-Wire Hoisting Load

Multi-wire friction hoist is the main system in coalmines. Steel wire ropes bear whole load of system. If there are different stretch distortions on every rope, then the rope over load has fatigue. No.399 rule in "Coalmine security rules" prescribes that difference between any rope load and average load should not over ?10%. It is important to inspect the load.According to the characteristic of hoisting, this subject uses real-time monitoring manner to measure the tension of steel cables. This system makes up of measuring part, transmitting data part and managing part that is put on ground.This subject advanced a new way to measure wire load. This way should not change the hoisting structure. A new press capacitance transducer is designed.According to the characteristic of sign transmission, we ensure the transmission manner. In transducer circuit, the modulating and signal magnifying circuit is designed in detail. The delicacy signal received from underground is reverted on ground. The received circuit is make up of magnify, mixing, filter the wave and demodulation circuits. MAX274 chip and wave filtering circuits is designed in detail.Use Visual Basic 6.0 language to empolder real-time load inspecting software. The software concludes many modules: such as load displaying curve, dynamic displaying curve, original parameter confirming, data inquiring and giving alarms.The experiment was accomplished in Liangzhuang coalmine of Longkou mining department. It, real-time monitoring system running status and large numbers of experiment-data, proves the rationality and security of this real-time monitoring system.