Alarm apparatus for engine lock type drill rod misoperation

This invention relates to machine lock bar alarming device with following rack fixed with rotation supportive devices and with first bar fixed behind the supportive device, wherein, the first bar is orderly set with at least one cylinder inside bar and inside bar connected with hang hole head; the said rotation supportive device is located with top board movable with down end match to each inside bar end; the upper end of top board matches with process switch; the down process switch is fixed on the upper side of first bar; the said down process switch is connected to the alarm device monitor circuit.