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起重卷筒的安全使用 | 2009-8-5 7:41:00
Re:起重卷筒的安全使用
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2009-8-5 7:43:17
1 卷筒上钢丝绳尾端的固定装置,应有防松或自紧的性能。对钢丝绳尾端的固定情况,应每月检查一次。 2 多层缠绕的卷筒,端部应有凸缘。凸缘应比最外层钢丝绳或链条高出2倍的钢丝绳直径或链条的宽度。单层缠绕的单联卷筒也应满足上述要求。 3 用于起升机构和变幅机构的卷筒,采用筒体内无贯通的支承轴的结构时,筒体宜采用钢材制造。 4 卷筒直径与钢丝绳直径的比值h,不应小于表8的数值。
Re:起重卷筒的安全使用
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2009-8-5 7:43:40
5 卷筒出现下述情况之一时,应报废: a. 筒壁磨损达原壁厚的20%。 b. 检查卷筒裂纹,横向小裂纹允许有一处,纵向小裂纹允许有两处(应在裂纹两端钻小孔,用电焊修补)超出这一界限就应报废。 c. 当气孔或砂眼的直径小于8mm,深度小于该处壁厚的20%,在100mm长度上不超过一处,全长上不多于5处,可以不必补焊而继续使用。 表8 卷筒和滑轮h1、h2值 机构工作级别 h1 h2 M1、M2、M3 14 16 M4 16 18 M5 18 20 M6 20 22.4 M7 22.4 25 M8 25 28
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