Spraying device in rocker arm of coal mining machine

The utility model discloses a coal mining machine rocker arm inner spraying device which comprises a first shell, one side of the bottom of the first shell is fixedly connected with a second shell, one side of the top of the first shell is fixedly connected with a third shell, and the inner wall of the first shell is fixedly connected with a transverse plate. The inner wall of the transverse plate is rotationally connected with a power rod through a bearing, and a transmission gear is arranged in the first shell. The utility model relates to the technical field of coal mining machines, in particular to an inner spraying device for a rocker arm of a coal mining machine, which can transfer heat generated during transmission of a gear into a water source between the first shell and the partition plate through the transfer rod by matching the water pipe, the partition plate, the transfer rod and the first shell, so as to cool the rocker arm of the coal mining machine. The phenomenon that components in the rocker