我矿选厂使用的4台φ5500×1800湿式自磨机的大齿轮护罩,在运转中经常发生钢板开裂,噪音增大而被迫停机修理的情况。有的护罩一年内停机检修仅达13次之多,每次检修至少需7个工时以上,还需更换半个上罩。这样,既增加了检修费用,又影响设备的运转率,护罩开裂时产生的强烈噪音,危及工人健康。 Four sets of φ5500 × 1800 wet self-grinding machine gear covers used by the mine selection plant often suffered cracking of the steel plate during operation and increased noise to be shut down for repair. Some shielded downtime within one year only up to 13 times more maintenance, each maintenance at least 7 hours or more, but also need to replace the half of the cover. This will not only increase maintenance costs but also affect the operation rate of the equipment, strong noise generated when the cover is cracked, and endanger the health of workers.