Concrete cutting machine lift self -lock device

The utility model relates to a concrete cutting machine lift self -lock device, including the lifting screw, be equipped with the locating hole of indent on the lifting screw, it can be for the pivot of locating hole separation and reunion to be provided with on the locating hole, the pivot overcoat has an axle sleeve, the axle sleeve is fixed in concrete cutting machine by fixing device on, the pivot side be close to the locating hole one side upwards be provided with the separation blade week, the axle sleeve inner wall is provided with the flange on keeping away from one side of locating hole, lies in partial upper cover between separation blade and the flange on the pivot and is equipped with the spring, the terminal surface of the distal end of axle sleeve be an inclined plane, the maximum shrink distance that highly is lighter than the spring on inclined plane, the distal end of pivot is provided with a drop bar, when the spring during at natural state the drop bar paste on the bottom on inclined plane. The utility model discloses ensured that the cutting depth is unanimous. When lifting up the blade, the drop bar is moved to the hand for the only need, makes the pivot and the locating hole of lifting screw separate, and the handle of rotatory lifting screw just can lift up the blade convenient operation, labour saving and time saving.