How to check the quality of elastic fasteners

The elastic strip is the crimping part of the elastic fastener. Through the bending and twisting deformation of the elastic strip, the buckle force is generated to act on the rail, and the reliable connection between the rails is guaranteed for a long time.

Common spring fasteners include type I, type II and type III, all of which are to maintain the integrity of the track as much as possible, prevent the vertical and horizontal movement of the rail relative to the sleeper, and ensure the normal gauge, so as to ensure the safety of rail vehicles.

The elastic strip of the clip fastener works under repeated alternating stress, which has many functions such as bending, torsion, fatigue and corrosion. When a vehicle passes by on the track, it needs to withstand a high instantaneous impact load, so the performance requirements for the clip fastener are very strict.

In addition, because the contact between the wheels running on the track and the rail is a rigid contact, vibration will inevitably occur, and the special elastic structure of the elastic strip can absorb the impact energy generated when the vehicle passes by, so as to achieve the effect of shock absorption and make the vehicle run more smoothly. Smoother and safer. Due to the large number of spring bars, different models will have differences in inspection items and methods.

The inspection items of spring fasteners include: form size, logo and factory standard, appearance, crack, hardness, metallographic structure, total decarburization layer, residual deformation, buckle pressure, fatigue performance and rust resistance performance, etc. Among them, the formal dimension includes the elastic distance, the arch height, the width of the nail/bolt, the width of the two limbs, the middle width, the diameter of the small middle part, the diameter of the small tail, the width of the arc diameter of the front end, the warp angle, and the contact between the straight segments of the two limbs Specific items such as length.