Most gantry crane rope drum unit on the shaft or rotating mandrel

Most  bridge gantry crane  rope drum unit on the shaft or rotating spindle. Meanwhile, the roll is fastened to the rotating shaft in the bearing or on the spindle. Placed on the outside of the roll bearing, so that parts can simplify assembly and disassembly and bearing lubrication.
    Gantry Crane drum unit in a fixed situation the mandrel is very small, only the crane working is not tight before use.
     At this time, gantry cranes reel hub (22) that has the bronze bushing or rolling bearing, in the latter case, the hub bearing means inside the cylinder, which makes the structure of the machine reel assembly and disassembly work becomes very complex.
     With the ring gear mounted on the rotating spindle spool case. Gantry crane reel mandrel supported on spherical roller bearings, one bearing is fixedly secured to the bearing seat, while the other is free to devices bearing in the bearing bracket. After a spherical bearings can compensate processing and assembly inaccuracies,hoist gantry crane and gantry cranes work produced during the deformation.
     Bearings are served through the lubricant pressure oiler to achieve. Rope and reel used to fix the screws on the system board through the drum spoke into the hole. In order to easily mounted gantry cranes mandrel roll, the roll hub (22) having a different diameter.
     This structure is very heavy, assembly and disassembly is also very complicated. Moreover,sino hoist gantry crane components in the manufacture of various parts in all not affect the accuracy of the work gear.