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　　The device that associates the moving pulley in the lifting pulley set with the hook is called a hook jacket. It is usually divided into long and short types. The pulley and hook of the long hook jacket are installed on the upper and lower shafts respectively. The hook uses ordinary short hooks. The hook beam and pulley shaft are supported on the pull plates on both sides, and the two ends are fixed by positioning baffles, so that the hook beam cannot move axially. This form has a large overall height, and will take up the effective lifting height of the adjacent part when used, but the horizontal dimension is small.

　　The short hook jacket is different from the former, and its pulley shaft is also a hook beam, which eliminates the pulley plate, but the number of pulleys must be even to be symmetrical. In order to prevent the hook from touching the pulleys on both sides when rotating, a long hook must be used. Although its appearance height is relatively small, it can increase the effective lifting height. However, its beams are heavy and large in size. Therefore, it is only used for the cranes with the largest lifting capacity, and long jackets are mostly used when lifting large loads. In order to rotate flexibly about the vertical axis when hooking, a thrust rolling bearing is provided between the nut on the tail of the hook and the cross beam. When the hook weighs a large amount, it is best to use a self-position thrust bearing with a ball pad, so that not only makes the rotating hook light, but also makes the bearing force uniform.

　　The device that associates the moving pulley in the lifting pulley set with the hook is called a hook jacket. It is usually divided into long and short types. The pulley and hook of the long hook jacket are installed on the upper and lower shafts respectively. The hook uses ordinary short hooks. The hook beam and pulley shaft are supported on the pull plates on both sides, and the two ends are fixed by positioning baffles, so that the hook beam cannot move axially. This form has a large overall height, and will take up the effective lifting height of the adjacent part when used, but the horizontal dimension is small.

　　The short hook jacket is different from the former, and its pulley shaft is also a hook beam, which eliminates the pulley plate, but the number of pulleys must be even to be symmetrical. In order to prevent the hook from touching the pulleys on both sides when rotating, a long hook must be used. Although its appearance height is relatively small, it can increase the effective lifting height. However, its beams are heavy and large in size. Therefore, it is only used for the cranes with the largest lifting capacity, and long jackets are mostly used when lifting large loads. In order to rotate flexibly about the vertical axis when hooking, a thrust rolling bearing is provided between the nut on the tail of the hook and the cross beam. When the hook weighs a large amount, it is best to use a self-position thrust bearing with a ball pad, so that not only makes the rotating hook light, but also makes the bearing force uniform.