一、吊钩 1.吊钩的螺纹尾部及退刀槽因为应力集中,容易产生疲劳裂纹。检修时,将吊钩清洗干净后,用20倍放大镜仔细检查吊钩表面,如有裂纹应报废。 2.如图1a,当吊钩危险截面的磨损量δ超过原尺寸H的5％(按GB10051-88制造的)或10％(按旧标准制造的)、吊钩的开口增加量(a’-a)超过原尺寸的10％(按GB10051-88制造的)或15％(按旧标准制造的)(此时a’与d大致相等或大于d),以及如图1b吊钩的扭转变形a超过10°,出现以上任一种情况吊钩都应 First, the hook 1. Hook the thread tail and undercut because of stress concentration, prone to fatigue cracks. Maintenance, the hook clean, with a magnifying glass with 20 times carefully check the hook surface, if any cracks should be scrapped. 2. As shown in Figure 1a, when the amount of wear δ of the dangerous cross-section of the hook exceeds 5% of the original size H (made according to GB10051-88) or 10% (as per the old standard), the amount of increase of the opening of the hook -a) over 10% of the original size (made according to GB10051-88) or 15% (made to the old standard) (where a ’and d are approximately equal to or greater than d), and the torsional deformation a more than 10 °, any of the above conditions should be hooks