Hole-drilling mechanical arm

The center of a rotating base (9) serves as a circle center, the mechanical arm serves as a radius, and height determination is performed in a circle-drawing mode, ensuring the perpendicularity of the hole-drilling arm (21) to the position where a working point is located. By means of controlling the rotation angle between a height adjustment arm and an angle adjustment arm (17), the straightness of the mechanical arm is ensured. The folding mechanical arm is convenient to transport, and is suitable for regions of different working radii. The height and angle of the mechanical arm are adjustable, solving the problem of difficulty in drilling holes for suspended support frames at different heights in the inner wall of the arc of a subway tunnel. Using a mechanical arm hole-drilling structure, labor investment is reduced, costs are saved, and working efficiency is improved.