Escalator and moving sidewalk driving chain fracture detecting and tensioning device

The utility model discloses an escalator and moving sidewalk driving chain fracture detection and tensioning device which comprises a fixing block and a fixing support, a rotating shaft is installed on the front face of the fixing block in a penetrating mode, and a supporting strip is installed on the outer surface of the rotating shaft in a sleeved mode. Two sets of bolts are installed on the front face of the supporting strip in a penetrating mode, and the outer surfaces of the bolts are connected with length adjusting rods through adjusting grooves. And a fixing piece is mounted on the outer surface of one side of the fixing block. The bolt and the length adjusting rod are installed through the supporting strip, the bolt is connected with the length adjusting rod through the adjusting groove, when the working length of the device needs to be adjusted, the bolt can be rotated through external force, a gap is formed in the connecting position of the bolt and the length adjusting rod, the length adjusting rod