主井2.8m提升机是我矿竖井的主提升机。为确保主井安全运转,决定对主提升机大轴应用超声波故障诊断技术进行探伤。1989年2月第一次对提升机大轴探伤,发现轴的联轴节根部有3处伤痕。为了确保诊断无误,又请外厂探伤复查,结果一样。于是决定更换大轴。首先 The main shaft 2.8m hoist is the main hoist of mine shaft. In order to ensure the safe operation of the main shaft, it was decided to apply the ultrasonic fault diagnosis technology to the main shaft of the main hoisting machine for flaw detection. 1989 February for the first time on the large shaft inspection hoist found that the shaft coupling root has 3 injuries. In order to ensure that the diagnosis is correct, please inspect the flaw in the factory for the same result. So decided to replace the big shaft. First of all