Sampling pipe valve follow-up fixing structure with large expansion displacement

The utility model discloses a large expansion displacement sampling pipe valve follow-up fixing structure in the technical field of steam pipeline structures, which comprises a main pipeline, the top of the main pipeline is fixedly connected with a sampling pipe, the sampling pipe is bent rightwards twice at a right angle and then vertically hangs downwards, a valve is arranged on the vertical hanging section of the sampling pipe, and the valve is connected with the main pipeline. Fixing pipe clamps are arranged at the positions, located at the front end and the rear end of the valve, of the sampling pipe correspondingly, the two fixing pipe clamps are connected to fixing supports on the sides through connecting rods correspondingly, and the two ends of the connecting rods are movably hinged through universal spherical hinge heads; the problem of large stress of sampling pipe elbows and welding seams caused by complex three-way large expansion displacement of main steam and reheat steam pipelines is completel