1、 Coefficient of shackle of
anchor chain accessories
The number of times of the anchor chain accessory shackle coefficient refers to the deformation coefficient of the anchor chain accessory shackle and the breaking coefficient of the anchor chain accessory shackle to ensure the use of the anchor chain accessory shackle.
The safety factor of anchor chain attachment shackle is calculated by dividing the limit working load by the limit working load. The limit working load is the large load that the product itself can bear, and the limit working load is the large load that the product is allowed to load in general use. The safety factor is usually expressed in the form of a ratio, such as 5:1. Theoretically, the minimum deformation coefficient of anchor chain accessory shackle products is 2.2:1, and the minimum breaking coefficient of anchor chain accessory shackle products is 4:1.
2、 Safety inspection steps for shackles of anchor chain accessories
One of the common riggings, the "anchor chain attachment shackle", is the most common one in hoisting machinery. It generally plays a connecting role. For example, if the wire rope shackle and the lifting lug cannot be directly connected, it can be connected through the anchor chain attachment shackle. From the shape, it is mainly divided into bow anchor chain attachment shackle and D-type anchor chain attachment shackle. Because of its great importance, safety inspection is required before each use. The following steps are for the safety inspection of anchor chain attachment shackle.
Step 1: Inspection before installation and use. The shackles of anchor chain accessories shall be certified by the manufacturer. Otherwise, the shackles of anchor chain accessories shall be subject to material chemical composition inspection and necessary mechanical performance tests (such as tensile test and impact test).
Step 2: surface inspection. Check the surface condition of anchor chain accessory shackles by visual inspection and touch. The surface of anchor chain accessory shackles in use should be smooth, free of burrs and acute angles, and free of cracks, folds, overburning and other defects.
Step 3: internal defect inspection. If necessary, internal flaw detection shall be carried out. The internal condition of anchor chain attachment shackle shall be checked mainly through nondestructive testing device. There shall be no internal cracks, white spots and any sundries that affect the use safety.
Step 4: Safety devices. If conditions permit, safety devices should be installed to prevent accidental falling off of lifting objects.
3、 Technical Standard for Safe Work of Anchor Chain Attachment Shackles
Anchor chain attachment shackle is a kind of sling tool. If anchor chain attachment shackle is classified by shape, it is widely used in the field of hoisting machinery due to its small size and large bearing capacity. To ensure the safety and reliability of the shackle of the anchor chain accessories, the following specific technical requirements shall be met:
The surface of the shackle of the anchor chain accessories shall be smooth and flat, and there shall be no cracks, overheating and other serious defects. Cast iron or cast steel shall not be used as the raw material of the anchor chain accessory shackles reused by crane. It shall be noted that the anchor chain accessory shackles shall be well maintained and shall not be drilled. It is not allowed to weld and repair cracks and other defects for recycling and reuse. The shackle body or axle pin of the anchor chain attachment shackle shall be replaced in a timely manner if it is deformed or damaged and reaches the scrapping standard.
