The situation of elastic pieces and elastic strip fastening parts used in my country

The elastic clamping parts mainly use the bending deformation performance of the material when working. The processing is relatively simple and the cost is often low. However, because the holes are opened for bolt tightening, stress concentration is prone to occur in this part. The large surface bending moment is exactly where the cross-section is eliminated. Weak and strong.

The arched spring-shaped fasteners developed in my country in the early days were found to be easily broken when the bolts were tightened. The vibration generated when the train passed by easily caused the springs to loosen, and some nuts even retreated from the bolts. In addition, the track gauge baffle is easy to climb up the rail bottom under the action of vibration, causing the track gauge to expand. Due to this situation, except for the DTⅠ and DTⅡ fasteners on subway lines, which use elastic pieces as fastening parts, they are no longer used on other rail lines. Use spring-type fasteners.

When working, the elastic strip fastening parts utilize the bending deformation performance of the material and the torsional deformation performance of the material (especially the circular cross-section elastic strip), so the elasticity is generally good, and there is basically no cross-section weakening, so the material utilization rate is high , on conventional lines, it is generally hoped that the fasteners will have high pressure and good elasticity. In this regard, elastic fasteners have obvious advantages.

At present, most of my country's railways and other rail transit use elastic strip-type fastening parts. The main forms of elastic strip fastening parts in my country are: elastic strips with bolt-mounted ω structure, such as Type I and Type II elastic strips commonly used. Clips, Shilongqiao small resistance clips, WJ-2 type clips, etc.; Pandrol type clips without bolt installation, such as Type III clips, DTVI fastener clips, PR type clips for Guangzhou Metro, etc.; and Other structural forms of spring bars, double toe spring bars, middle spring bars.