The important function of fishplate and installation precautions

Fish plate is a common railway accessory and one of the typical railway accessories in the railway switch industry. I believe everyone is familiar with it. It mainly plays a connecting role in railway switches. Although it looks inconspicuous, its effect is not small at all. Fish plate is used to firmly fix the rail to the sleeper or elastic base plate. One is to remove the buckling force, and the other is to withstand the vertical force, transverse force and longitudinal force from the rail. In order to avoid excessive deformation caused by three-dimensional forces, which will cause the train to swing too much, reduce riding comfort, and even affect driving safety, the more commonly used buckles are spring-type or spring-type elastic buckles. Compared with the track pressure plate, the fishplate has many advantages, such as following the track deformation, not easy to loosen, anti-fatigue performance, etc. At this point of co-elasticity, the shrapnel fishplate takes advantage of its bending strain, but don't worry, the shape is relatively simple. It can not only buckle rails and withstand lateral thrust, but also be used for small radius curves, while the elastic fishplate can utilize both its bending strain and its torsion strain.
The main function of the railway accessories fishplate is to connect and clamp two rails to resist the shear force of the joint and prevent the rail head teeth from staggering. The rail joint itself has a weak structure, and a large impact force will be generated when the train passes through the joint. Therefore, the fishplate is required to be tightly connected to the rail and have sufficient strength. Therefore, steel with good rigidity and toughness should be used, and heat treatment should be carried out if necessary to increase the allowable stress of the fishplate of railway equipment and improve the hardness and wear resistance of its supporting surface. There are slopes on the upper and lower sides of the fishplate, which are consistent with the slopes of the rail bottom and rail head. When the fishplate bolts are tightened, they must not come into contact with the rail waist. This way, if the fishplate becomes slightly worn, the bolts can be re-tightened to keep the joint securely connected.