1, the acquisition hook should be used by the technical documents of the manufacturer’s certificate and other technical documents; the important department procurement hook, such as the railway, the port and so on, the hook out of the factory must be strictly inspected (inspection). 2, the hook should not have the defects that affect the safety of the use performance; the hook defect shall not be welded and repaired; the hook surface should be smooth, and there shall not be defects such as crack, folding, sharp angle, burr, spalling, burning and so on. 3, in the shortest distance of the hook opening, two appropriate locations can be selected to print the signs that are not easy to wear and determine the distance of the mark, as the basis for detecting the change of the opening degree in the use. 4, hook material can be selected 20 high-quality carbon steel or hook material DG20Mn, DG34CrMo and other forging made, strictly prohibit the use of casting hook. The materials for plate hooks are usually A3, C3 common carbon steel or 16Mn low alloy steel. 5, the technical conditions of self-made hooks should meet the requirements of GB 10051.1-88 to GB 10051.5-88 (new standard: GB10051.1-2010 to GB 10051.5-2010). 6. The longitudinal axis of the plate hook must be located in the rolling direction of the steel plate, and the hook piece is not allowed to be spliced. 7. The plate hook should be riveted by countersunk rivet, while the high stress bending parts where the hook and the lifting point of the hoisting hook are not connected with rivet. 8. No closed welding is allowed between laminate hooks. Interrupted welding is allowed. Container hook 9. Hooks for overloading tests should be scrapped.
27 Jul