The WJ-7 railway fastener system is the core component of ballastless track. With its unique design and excellent performance, it plays a key role in the construction and operation of high-speed railways.
Good track elasticity
As a shoulder-free fastener system, the WJ-7 type does not need to directly constrain the rails through rigid shoulders, but relies on elastic components such as spring bars and rail pads to provide clamping pressure and buffering. This design gives the track good elasticity, effectively absorbs the impact and vibration generated by train operation, reduces the wear of rails, sleepers and fastener systems, and extends the service life of the track structure. At the same time, the elastic performance also helps to improve the comfort of train operation and reduce wheel-rail noise.
Powerful adjustment capabilities
The WJ-7 system has excellent height and gauge adjustment functions. In terms of height adjustment, by replacing height adjustment pads of different thicknesses under the rail and under the iron pad, the maximum adjustment amount can reach 30mm, which can effectively deal with track settlement, construction errors, etc.; the track gauge adjustment relies on the oblong hole at the connection between the iron pad and the spiral spike, allowing the iron pad to move left and right, and the adjustment amount is ±10mm, which is convenient for accurate control of track gauge during track laying and later maintenance to ensure safe operation of trains.
Stable force performance
The spring clips of the WJ-7 fastener system are divided into W1 type and X2 type. The W1 type spring clips can provide strong buckling pressure in general areas, and the X2 type spring clips are used in small resistance areas to meet special needs. After scientific design, when using W1 type spring clips and rubber pads, the longitudinal resistance of each set of fastener rails is not less than 9kN; under the small resistance configuration (X2 type spring clips and composite pads), it is 4.0kN±1.0kN. At the same time, after the fatigue test of 3×10⁶ load cycles, the performance of each component of the system is still stable, and the gauge expansion and the change rate of various mechanical properties are within the specified range, ensuring the reliability of long-term use.
Excellent insulation performance
The insulation block in the system is set between the spring bar and the rail, and the embedded sleeve is made of nylon material. Combined with the insulation design of the rail pad, the WJ-7 fastener system has good insulation performance, and the insulation resistance is not less than 5kΩ, which effectively prevents short circuits in the track circuit, ensures the normal operation of the train signal system, and provides reliable protection for the safe dispatching and command of the train.
The WJ-7 railway fastener system has become a reliable choice for modern high-speed railway ballastless tracks with its good track elasticity, strong adjustment ability, stable force performance and excellent insulation performance, and escorts the safety, efficiency and comfort of railway transportation.