The utility model relates to
tunnel safety technical field, and disclose a kind of line-of-
sight monitoring early warning device for
tunnel safety, including target board body, the rear end of target board body is fixedly connected with adjusting
assembly, the surface of adjusting
assembly is fixedly connected with mounting plate, adjusting
assembly includes installation platform one, the inner wall top of installation platform one is fixedly connected with fixed column one, the surface of fixed column one is rotatably connected with movable sleeve, the surface of movable sleeve is fixedly connected with connecting frame, the inside of connecting frame is installed with threaded sleeve, the inside
screw thread connection of threaded sleeve has
threaded rod, the front end of
threaded rod is fixedly connected with fixed sleeve. The utility model is by fixed column one, movable sleeve, threaded sleeve,
threaded rod, fixed sleeve, fixed column two, installation platform two, sliding block and slide rail component adjusting assembly setting, the rotation of threaded rod is converted into the swing of target board around fixed column one, realizes the accurate alignment to curved horizontal
line of sight.