Rigging refers to the metal load-bearing tool that's connected between the lifting machine and the object being lifted in order to realize the movement of the object, and the load-bearing member to stabilize the space structure. Widely used in ports, electric power, construction, auxiliary pipelines, and other important industries. It mainly includes wire rope slings, chain slings, shackles, hooks, magnetic spreaders, and other categories.
Because of its small size and large load, shackles have become the most widely used connection tools in lifting operations. They are generally used for rigging end fittings and directly connect to the suspended object during lifting operations. When the rigging is used in conjunction with the beam, the shackle can be used to connect the top of the rigging to the ear plate at the lower part of the beam instead of the ring, which is convenient for installation and removal.
1.Quality requirements for shackles
a. The shackle should be smooth and flat, and no defects such as cracks, sharp edges, and overheating are unallowed.
b. Do not use shackles made of cast iron or cast steel. The buckle body can be forged with calm steel, and the pin can be machined after bar forging.
c. Do not drill or weld repairs on shackles. After the buckle body and shaft pin have been permanently deformed, they must not be repaired.
d. When used, the plug body and the buckle should be checked, whether there is severe wear, deformation and fatigue crack.
e. When using, the lateral distance must not be pulled, and the shaft pin must be inserted with the safety pin.
f. After the shaft pin is correctly assembled, the inner width of the buckle body must not be significantly reduced, and the screw connection is good.
g. The use of shackles must not exceed the specified safety load.
2. Quality inspection of the shackle
a. Smooth and flat, no cracks, sharp edges, and over-burning defects are allowed. Use a magnifying glass to review the suspicious area.
b. The shackle is tested by double the safety load as the test load. The shaft pin must not be permanently deformed and can rotate freely after being loosened. The length increase of the buckle body must not exceed 0.25% or 0.5mm.
c. The shackle can be tested for sampling reliability. The load is double the test load. Shackles must not rupture or deform such that they lose their carrying capacity.
d. The safety load of the current shackle is approved at M (4) level.
e. The buckle body should be marked with strength level and safety load.
3． Scrap standard of the shackle
a. There is obvious permanent deformation or the shaft pin cannot rotate freely.
b. The wear amount of the cross-section of the buckle body and the shaft pin is more than 10% of the original size.
c. Cracks appear anywhere in the shackle.
d. The shackle cannot be locked.
e. Failed after shackle test.