- Jan 11, 2018 -
1, the purchase of the hook should be factory certification and other technical documents can be used; important departments to purchase hooks such as: railways, ports, hook factory needs strict inspection (flaw detection).
2, hook must not affect the safety of the use of the performance of defects, hook defects shall not be welded, hook surface should be smooth, no cracks, folds, sharp corners, burrs, stripping, over burning defects.
3, can be in the shortest distance of the hook openings in the selection of two suitable location printing is not easy to wear signs, measuring the distance of the mark, as the use of detection of the opening degree is the basis for change.
4, the hook material can choose 20 high quality carbon steel or hook special material dg20mn, Dg34crmo and so on forging makes, prohibits the use casting hook, the board hook material general application A3, C3 ordinary carbon steel, or 16Mn low-alloy steel.
5, the plate hooks the longitudinal axis of the hook piece, must be located in the rolling direction of the steel plate, and the hook piece does not allow splicing.
6, Board hook and Hook piece application countersunk head rivet riveting, and in the plate hook and lifting material hanging point contact with high stress bending parts shall not be used rivet connection.
7, the plate hook laminated between not allow the full closed welding, only allow intermittent welding.
8, if it has exceeded the use of the time limit or exceed the use of the hook should be scrapped treatment, to ensure the use of safety.