The influence of the roughness of the contact surface of the fishplate on the contact resistance and electrical conductivity stability
What problems can be caused by a low roughness of the contact surface?
The low roughness leads to an overly smooth contact surface, which is prone to generating gaps during bonding and reducing the contact area. The contact resistance increases, causing severe heat generation during current transmission, which affects the signal transmission of the track circuit and the backflow of the traction current.
What effects will a high roughness of the contact surface have?
Excessively high roughness can cause uneven contact surfaces, excessive local contact stress, and easily lead to contact fatigue and wear. Long-term use can lead to deformation of the contact surface, increased clearance, intensified resistance fluctuations, and cause overheating and malfunctions.
What is the significance of roughness control for electrified railways?
Electrified railways rely on stable electrical conductivity. Qualified roughness can ensure stable contact resistance, reduce energy consumption and heat generation. Avoid problems such as signal failure and excessive traction loss caused by poor conductivity to ensure driving safety.
How to control the roughness of the contact surface of the fishplate through processing technology?
By adopting fine processing techniques such as grinding and polishing, and controlling processing parameters and tool accuracy, the roughness of the contact surface meets the standards. After processing, clean the surface impurities to ensure flatness and adhesion, and reduce contact resistance.
What track circuit faults can be caused by excessive roughness?
Exceeding the standard will lead to unstable contact resistance, resulting in signal attenuation, red light bands, poor circuit splitting and other faults. When the train occupies the track, the signal cannot be correctly identified, which directly threatens the train operation dispatching and safety.