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目前发现,不少4米和5米等大型绞车,由于对卷筒开裂故障处理不当,效果不好,已经成为响影生产的关键问题。现场往往是:只要发现卷筒某个部位出现裂纹,便对裂纹部位反复焊补,加强。实践证明,这种处理方法很不得当,效果很不好。卷筒某个部位出现疲劳裂纹,说明这个部位的实际应力已经超过了材料的疲劳限。控制裂纹继续发展的最好办法是:对裂纹部位采取有效地卸载措施,即减裂纹部位所承担的外载和把裂纹部位的实际应力降低到疲劳限以下,而把裂纹部位卸掉的外
It has been found that quite a few large winches such as 4 meters and 5 meters have become key issues in the production of loudspeaker images due to improper handling of the cracking of the reels and poor results. The scene is often: as long as the discovery of cracks in a certain part of the reel, they repeatedly welded parts of the crack, strengthen. Practice has proved that this approach is very inappropriate, the effect is not good. Fatigue cracks appear in one part of the roll, indicating that the actual stress in this area has exceeded the fatigue limit of the material. The best way to control the crack growth is to take effective measures to relieve the cracks, that is to say, reduce the external load on the crack site and reduce the actual stress at the crack site below the fatigue limit, and remove the crack site