Crane Hook Water Glass Investment Casting

Product Introduction

Classification
Hooks are divided into single hooks and double hooks according to their shapes; they are divided into forged hooks and laminated hooks according to their manufacturing methods.
The single hook is simple to manufacture and easy to use, but its stress resistance is not good. It is mostly used in workplaces with a lifting capacity of less than 80 tons. When the lifting capacity is large, double hooks with symmetrical stress are often used. The laminated hook is riveted by several cut and shaped steel plates. When cracks occur in individual plates, the entire hook will not be damaged. It is safer, but has a larger weight. It is mostly used for lifting large loads or lifting ladles of molten steel. on the crane. Hooks are often impacted during operation and must be made of high-quality carbon steel with good toughness.
Hooks are widely classified, generally including: shackles, rings, rings, pear-shaped rings, long rings, combination rings, S hooks, nose hooks, American hooks, claw hooks, eye-shaped sliding hooks, and rings with insurance cards Screws and chain shackles have the characteristics of uniqueness, novelty, high quality and safety. Crane hook water glass investment casting is suitable for factories, mines, petroleum, chemical industry and ship terminals, etc. Ensure safety, quality safety factor, static load reaches 3 times. Lifting weight ranges from 5 tons to 150 tons.
 

Skills Requirement
1. The purchase of hooks must have technical documents such as certificates from the manufacturer before use; hooks purchased by important departments such as railways, ports, etc. must be strictly inspected (flaw detection) before leaving the factory.
2. The hook must not have defects that affect safe performance; hook defects must not be repaired by welding; the surface of the hook should be smooth and free of cracks, folds, sharp angles, burrs, peeling, overburning and other defects.
3. You can select two suitable positions to print non-wearable marks at the shortest distance from the hook opening, and measure the distance of the marks as a basis for detecting whether the opening degree changes during use.
4. The hook material can be forged from 20 high-quality carbon steel or special hook materials such as DG20Mn and DG34CrMo. The use of cast hooks is strictly prohibited. The material of the plate hook is generally A3, C3 ordinary carbon steel, or 16Mn low alloy steel.
5. The technical conditions of homemade hooks should comply with the regulations of GB 10051.1-88～GB 10051.5-88 (new standard: GB10051.1-2010～GB 10051.5-2010)
6. The longitudinal axis of the hook piece of the plate hook must be located in the rolling direction of the steel plate, and the hook pieces are not allowed to be spliced.
7. The hook piece of the plate hook should be riveted with countersunk head rivets, and rivets should not be used to connect the high-stress bending parts where the plate hook contacts the lifting point of the hoisted object.
8. Fully enclosed welding is not allowed between plate hook laminations, only intermittent welding is allowed.
9. Hooks that have undergone overload testing should be scrapped.
 

Dangerous Section
The hook has three dangerous sections. Special attention should be paid during inspection. The three dangerous sections of the hook are:
(1) The A-A section is subject to the tensile force of the sling on the one hand, and the hook has a tendency to be straightened; on the other hand, it is also subject to the bending moment. Because the bending moment acting on this section is the largest and the bending stress it suffers is also the largest, so this section is a dangerous section.
(2) The B-B section is the same as the A-A section. Under the action of the tension of the sling, the B-B section has a tendency to be straightened and sheared. The shear stress here is the largest, so it is also a dangerous section.
(3) C-C Section This section is the thinnest part of the hook column, which has a tendency to be broken under the action of the tension of the sling. The tensile stress here is the largest, so it is also a dangerous section.
 

Detection Systems

Copper Silica Sol Investment Casting