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在《关于凿井提升钩头及连接装置的安全系数和钩头系列问题》一文中曾经提到,选择钩头的安全系数时,要考虑两方面的因素。一方面,钩头在提升正常荷重时,应该对材料的屈服极限或疲劳极限有一定的安全度,保证钩头工作时有足够强度,不发生任何破坏,包括疲劳断裂;另一方面,钩头遇到意外事故（例如断绳）时,应该对它的承载能力有一定的安全度,保证不会因钧头破坏而造成重大事故。该文还提到,按最后破坏荷重来说,上部
As mentioned in the article “Safety Factor and Hook Head Series of Sinking Hooks and Connections”, two factors should be taken into account when selecting the safety factor for a hook head. On the one hand, when lifting the normal load, the hook head should have a certain degree of safety on the yield limit or the fatigue limit of the material so as to ensure that the hook head works with sufficient strength without any damage, including fatigue fracture; on the other hand, In the event of an accident (for example, a broken rope), it should have a certain degree of safety in its carrying capacity, ensuring that no serious accidents will result from the destruction of the Jun head. The article also mentions that according to the final destruction load, the upper part