Hook is a kind of widely used hardware products, but the standard hook also needs to have a certain basic technical requirements, hook technical requirements what?What are the details of the technical requirements of the hook?Take a look at the following small series for you to organize the relevant knowledge!The basic technical requirements of the hook are:
1, the purchase of hook should be the manufacturer's certificate and other technical documents can be used;Key departments to purchase hook such as: railway, port, hook factory to strict inspection (flaw detection).
2. The hook shall not have defects that affect the safe use performance;The hook defect shall not be repaired by welding;The surface of the hook should be smooth, and there should be no cracks, folds, acute angles, burrs, peeling, burning and other defects.
3. Two appropriate positions can be selected at the shortest distance of the hook opening to print the sign that is not easy to wear, and the distance of the sign can be measured as the basis for detecting whether the opening degree has changed in use.
4, hook material can choose 20 high quality carbon steel or hook special materials such as DG20Mn, DG34CrMo forged, the use of casting hook is strictly prohibited.The material of the plate hook is generally A3, C3 ordinary carbon steel, or 16Mn low alloy steel.
5. The longitudinal axis of the plate hook must be located in the rolling direction of the steel plate, and the hook is not allowed to splice.
6, the plate hook hook should be riveted with countersunk head rivet, and the high stress bending part of the plate hook and the lifting object should not be connected with rivet.
7. Fully closed welding is not allowed between plate and hook laminates, only intermittent welding is allowed.
8. If the hook has exceeded the service life or has been overloaded, it should be scrapped to ensure its safety in use.