Fastening System Components and Working Principles
- What are the main components of the fastening system?
The main components include elastic clips, bolts, nuts, clips (or gauge plates), under - rail pads, spikes, etc. Elastic clips provide clamping force to tightly hold the rails; bolts and nuts are used to fix the connecting components; clips (or gauge plates) assist in adjusting the gauge and transmitting force; under - rail pads play a role in buffering and shock absorption; spikes fix the sleepers to the roadbed.
- How do elastic clips play a key role in the fastening system?
Elastic clips generate clamping force through their own elastic deformation, tightly pressing the rails to prevent the lateral and longitudinal movement of the rails. When the train passes, it can absorb the impact energy of the wheels on the rails, reduce the vibration of the rails, and ensure the stability of the track geometry. Different types of elastic clips, such as Type I, Type II, and Type III elastic clips, have different clamping forces and elasticities due to structural differences, and are suitable for different railway conditions.
- What is the impact of the fit between bolts and nuts on the fastening system?
Bolts and nuts need to be closely matched, and the appropriate tightening torque is crucial. If the torque is too small, the components are not firmly connected and are prone to loosening; if the torque is too large, the bolts may break or the components may deform. In actual installation, a torque wrench should be used to accurately control the torque according to the bolt specifications and the use environment. For example, in a high - temperature environment, the bolts expand due to heat, and the tightening torque needs to be adjusted appropriately to maintain the fastening effect.
- How do under - rail pads work with other components to absorb shock?
The under - rail pad is located between the rail and the sleeper. When the train load acts on the rail, it first absorbs part of the energy, reducing the impact force transmitted to the sleeper. At the same time, it works together with the elastic clips. The elasticity of the elastic clips and the cushioning performance of the pads complement each other, further reducing the amplitude of vibration transmitted to the roadbed, protecting the sleeper and roadbed structure, and extending the service life of the track.
- What is the principle of clips (or gauge plates) in adjusting the gauge?
Clips (or gauge plates) adjust the gauge through different models and sizes. During installation, appropriate - numbered clips (or gauge plates) can be selected and installed on both sides of the rail. Using their matching relationship with the rail and the sleeper, the rail can be pushed or pulled to achieve fine adjustment of the gauge. For example, in curve sections, by adjusting the combination of clips (or gauge plates) on different sides, the requirements for gauge widening of curve tracks can be met.