Mechanical drilling slot depth measuring device and slot depth measuring method

The invention belongs to the technical field of coal mine gas treatment, and particularly provides a mechanical drilling seam groove depth measuring device and a seam groove depth measuring method.The mechanical drilling seam groove depth measuring device comprises an outer pipe, an inner pipe and a center rod, an inner cavity of the outer pipe is in an L shape, and the two ends of the pipe cavity are an inlet and an outlet respectively; a plurality of measuring blocks are coaxially arranged at the front end of the inner cavity of the outer tube; the method for measuring the depth of the slot comprises the following specific steps of: implementing drilling operation and slotting operation; assembling a mechanical drilling slot depth measuring device; adjusting the outer pipe to an initial measurement angle; splicing a measuring block, and lowering the spliced measuring block into the slot until the measuring block reaches the deepest point of the measuring position of the slot; and the measuring block is with