Shaft mechanism of drill boom of umbrella drill

The utility model belongs to the technical field of vertical shaft umbrella drills, and particularly relates to a shaft mechanism of a drill boom of an umbrella drill, which comprises a mounting table fixedly arranged at the top end of a drill floor through a fixing column, a sleeve rotatably arranged on the outer ring of the fixing column through a first bearing, a connecting frame arranged on the outer side wall of the sleeve, and a drill boom arranged at the other end of the connecting frame. The drill boom rotates around the axis of the drill floor in the vertical direction, a driving assembly for driving the fixing column to rotate/lock is arranged on the drill floor, and the driving assembly comprises a transverse worm gear arranged on the outer ring of the sleeve. When the drill boom needs to be driven to rotate around the central column, the servo motor is started to drive the worm to rotate, the sleeve and the connecting frame are made to rotate through the worm gear, so that the drill boom is driven