1, the purchase of hooks should have the manufacturer's certificate and other technical documents can be used; important departments to purchase hooks such as: railways, ports, etc., hook factory to be strict inspection (testing). The following are the same as the "
2, the hook should not affect the safety performance of the defects; hook defects shall not be welded; hook surface should be smooth, no cracks, folding, acute angle, burr, stripping, burning and other defects. The following are the same as the "
3, the hook can be selected in the shortest distance between the two appropriate location to print the mark is not easy to wear, measure the distance of the mark, as the use of detection of openness is the basis for changes. The following are the same as the "
4, hook material can be used 20 high-quality carbon steel or hook special materials DG20Mn, DG34CrMo made of forging, is strictly prohibited to use casting hook. Plate hook materials generally use A3, C3 ordinary carbon steel, or 16Mn low alloy steel. The following are the same as the "
5, the hook hook the vertical axis, must be located in the rolling direction of the steel plate, and the hook does not allow splicing. The following are the same as the "
6, the hook hook hook application of head rivet riveting, and in the hook hook and lifting material hanging point of high stress bending parts shall not be connected with rivets.
7, plate hook between the film is not allowed to fully enclosed welding, only allowed to intermittent welding. The following are the same as the "
8, if the use of the period has been overdone or over the use of the hook should be used for disposal, to ensure the use of safety.