Anti-drop device for aluminium alloy sliding window and door

The utility model discloses an anti-drop device for aluminium alloy sliding window and door, which is characterized in that the anti-drop device comprises a fixing box of which the opening is opened, a lifting arm and a connecting piece, and the lifting arm and the connecting piece are arranged in the fixing box. The upper end of the lifting arm is connected with a roller, and the lower end of the lifting arm is movably connected with the connecting piece; a frame of the lifting arm is fixed in the two symmetrical sliding chutes which are arranged on the front wall and the back wall of the fixing box, and the frame of the lifting arm is fixed by the slide bolts which are arranged in the middle of the lifting arm; adjusting screws pass through a small hole which is fixed on the lower part of the side wall of the fixing box to be connected with threads on the other end of the connecting piece which is arranged at the bottom in the fixing box; the lifting arm can be moved up and down by rotating the adjusting screws to drive the roller which is on the upper end of the lifting arm to extend out of the fixing box or retract into the fixing box, and therefore, the utility model can prevent aluminium alloy windows (doors) from sliding off window frames or door frames.