Mae Shackle yn affeithiwr rigio anhepgor wrth godi gweithrediadau adeiladu. Gellir defnyddio hualau i gysylltu pwlïau codi a slingiau sefydlog. Mae'n offeryn cysylltu ysgafn a hyblyg a ddefnyddir yn helaeth.Hualaugellir eu rhannu'n hualau bwa ac hualau siâp U. yn ôl eu nodweddion ymddangosiad. Yn ôl y pwrpas, mae yna: hualau cadwyn, hualau angor, a hualau arnofiol.
(1) Y gadwynhualau is a hualau used to connect the anchor chain. When in use, the horizontal bolt should be upward, and the horizontal bolt should be round to prevent it from rotating in the bolt hole and increase its strength. When using, first take out the horizontal bolt of the hualau, put the U-shaped buckle into the anchor chain ring to be connected, and then connect the horizontal bolt in series to an anchor chain ring above. In order to prevent the horizontal bolt from coming out, there is an oblique hole at each of the two ends of the horizontal bolt and the U-shaped buckle for driving the brake oblique pin. In order to prevent the oblique pin from coming out, a green lead seal should be inserted into the cavity left at the pin hole. Before the oblique pin is inserted into the pin hole, calcium-based grease should be applied to prevent rust.
(2) Angor hualau is the hualau used to connect the anchor chain and the sinker, and the method of use is the same as the chain hualau.
(3) The floating hualau is the hualau used to connect the floating body and the anchor chain, and the method of use is the same as the chain hualau.