Mounting and fixing device for approach switch of rail weighbridge and use method of mounting and fixing device

The invention relates to a rail weighbridge proximity switch installing and fixing device and a using method, the installing and fixing device comprises a positioning assembly, a first support, a second support and an installing portion, the positioning assembly is located on a weighing beam and located on one side of a weighing rail, the first support is L-shaped, the bottom of the first support is in the horizontal direction, and the second support is arranged on the installing portion. The second support is connected with the positioning assembly, the bottom end of the second support is connected with the vertical part of the first support, the top end of the second support is connected with the mounting part, the mounting part is higher than the weighing rail, and the proximity switch is arranged in the mounting part. The weighing platform steel rail has the advantages of being convenient to machine and install and high in applicability, the rigidity of the weighing platform steel rail is improved, and tr