Let’s take a look at the rail SQ heat treatment production line composed of medium frequency induction heating machine

Rails are an important component of railways and mainly bear the impact and wear from wheels. In order to meet the needs of rail work, many manufacturers use SQ treatment production lines composed of medium frequency induction heating machines for heat treatment to improve the hardness and wear resistance of rails, and the effect is very good. Today, let’s take a look at this SQ processing production line consisting of a medium frequency induction heating machine.

Before talking about the SQ processing production line, let us first understand what the SQ processing process is. The SQ treatment process mainly includes three processes: preheating, heating and cooling. After understanding these three processes, it will be much simpler for us to look at the SQ heat treatment production line.

The induction heating rail head quenching treatment production line developed and designed by the Railway Science Research Institute is arranged in a straight line to facilitate the entry and exit of the rails. This production line can process 20-500m rails and can perform full-length heat treatment on various cross-section rails. The production line consists of the following parts.

(1) Medium frequency induction heating machine and heating sensor. The line is powered by two 250kW, 1000Hz medium frequency induction heating machines, which supply preheating inductors and heating inductors respectively. The preheating sensor is in the shape of a barrel, and the heating sensor is in the shape of an I. The sensor fully ensures the heat penetration and uniform temperature of the rail head.

(2)Quenching cooling device. There are 2 cooling chambers behind the heating sensor, with a spray air cooler (compressed air spray) and a water mist cooler installed inside. The quenching cooling speed is controlled by adjusting the air pressure, air volume, water pressure, and water volume. The air jet and spray device rely on the floating mechanism to maintain a relatively stable distance from the cooled rail head surface to stabilize the cooling conditions and obtain a uniform and stable metallographic structure.

(3) Advancement and straightening of rails. The rails advance and move along the roller conveyor and are transported through the main and auxiliary rail transport mechanisms. The transport speed can be adjusted at any time. The rail feeding mechanism ensures that the rails move smoothly and uniformly. After quenching, the rails will undergo certain bending and twisting deformations, and are finally straightened by the three-point bending method. After the rails complete SQ processing, they are unloaded from the production line by special lifting machinery.