Function and application of fishplate
- What are the common materials of fishplates? What are the characteristics of different materials?
Common materials include cast iron, Q235 steel, and high - strength alloy steel. Cast iron fishplates have a low cost and simple casting process, but their toughness and strength are relatively low, suitable for lines with low traffic volume and slow speed. Q235 steel fishplates have certain strength and toughness, with a moderate price, and are widely used in general railway main lines. High - strength alloy steel fishplates have high strength, good toughness, and wear resistance, and can withstand the impact and vibration of heavy - haul trains, mostly used in heavy - haul railways and high - speed railways.
- What are the technical requirements for the installation of fishplates?
Before installation, ensure that the end face of the rail joint is flat and clean, free of debris and oil stains. The fishplate should fit closely with the rail, and its holes should be accurately aligned with the bolt holes on the rail. High - strength bolts are used for fastening, tightened in sequence according to the specified torque, generally following the diagonal tightening principle to ensure uniform force on each bolt and prevent the fishplate from skewing. After installation, check the gap between the fishplate and the rail. If the gap is too large, readjust or replace it.
- Under the long - term operation of trains, what common diseases will occur to fishplates?
Repeated rolling and vibration of trains can cause the bolts of fishplates to loosen, making the joint connection loose. The surface of the fishplate may experience wear, especially at the contact part with the rail. Severe wear will reduce the connection strength. Under large loads, the fishplate may deform or even break, affecting the stability of the track structure. In addition, the fishplate may rust due to corrosion, shortening its service life, especially in harsh environments such as wet and saline - alkaline areas.
- How to carry out daily maintenance and upkeep of fishplates?
During daily inspections, check the appearance of the fishplate for cracks, deformation, wear, etc. Use a torque wrench to regularly detect the bolt torque and tighten loose bolts in a timely manner. Clean the surface of the fishplate and surrounding debris to prevent foreign objects from affecting the connection effect. For rusted fishplates, carry out rust removal treatment and apply anti - rust grease. If the fishplate is worn, deformed, or broken, replace it in time to ensure the reliability of the rail joint.
- What are the new development directions of fishplate technology?
In the future, fishplates will develop towards lightweight, high - strength, and intelligent directions. New lightweight alloy materials will be used to reduce the weight of fishplates while ensuring strength, reducing the difficulty of installation and maintenance. By optimizing material formulations and processing techniques, further improve the strength and wear resistance of fishplates. Develop intelligent fishplates with sensors to real - time monitor the force, deformation, and other states of the joint, achieve fault early warning, provide data support for railway maintenance, and enhance the intelligent level of track maintenance.