Roller way limiting alarm device

The invention relates to the technical field of roller way limiting, and discloses a roller way limiting alarm device which comprises a roller way body, two first mounting plates are fixedly connected to the top of the roller way body, a plurality of threaded sleeves are rotationally connected to the two first mounting plates, and the threaded sleeves are in transmission connection through a transmission mechanism; according to the roller way limiting alarm device, the transmission mechanism drives the threaded sleeve to rotate, the threaded sleeve drives the adjusting mechanism to operate, and the adjusting mechanism drives the limiting mechanism to move, so that the roller way can conduct limiting conveying on objects of different sizes, and the conveying applicability of the roller way is improved; the limiting roller drives the mounting block to slide in the mounting groove, the mounting block begins to extrude the spring, the spring contracts, at the moment, the first contact block makes contact with the