The application discloses a
bottle cap airtightness detection device, relates to the field of
bottle cap airtightness detection, and comprises a case, a supporting plate, a pressing
assembly and a positioning
assembly. One of the moving rods is moved, the sliding block is matched with the internal through groove of the transmission rod, the other two moving rods are driven to move radially to the air inlet synchronously, the moving rod drives the arc-shaped plates to extrude the side surface of the
bottle cap through the action of the spring and the limiting rod, the three arc-shaped plates are synchronously retracted, the
bottle cap is positioned above the air inlet, the misplacement of the
bottle cap is avoided, and the airtightness detection is affected. The rotating rod is driven by the U-shaped frame to rotate to the vertical position, the connecting rod drives the lifting block to move downward, the pressing plate is further driven to press on the top of the
bottle cap, the bottle cap is pressed, the rotating rod and the connecting rod form a toggle lever mechanism, when the rotating rod and the connecting rod are in the vertical state, that is, when the pressing plate presses the bottle cap, the mechanical locking effect can be realized, and the sealing effect of the bottle cap is guaranteed.