Crane beam mechanism for crane beam structure

The utility model belongs to the technical field of crane beams, particularly relates to a crane beam mechanism for a crane beam structure, and aims to solve the problems that in the prior art, a screw rod cannot be lubricated, the screw rod is rusted and seriously worn after being used for a long time, so that the screw rod is damaged, and when the crane beam mechanism is used for hoisting goods, the crane beam mechanism cannot lubricate the screw rod. In order to solve the problems that in the prior art, due to the fact that the crane beam body does not have a positioning function, the condition of swinging occurs during cargo lifting, pressure is applied to a screw, and screw teeth are deformed and damaged after a long time, the following scheme is provided: a servo motor is embedded and mounted at the top of the crane beam body, and the top of the crane beam body is rotationally connected with the screw; according to the screw rod lubricating device, lubricating operation on the screw rod is achieved thro