Detailed Description
The bulged fish plate (also known as the bulged rail connecting plate) is a special component in railway track connections.
Its design focuses on enhancing the stability of welded joints and optimizing stress distribution. It is particularly suitable for scenarios where high requirements are placed on the strength of the track structure.
Key Features
1.Structural Design
Layout of the bulged section:
The bulge is located in the middle of the fish plate, with a height usually ranging from 10-15mm. a width covering the weld area (approximately 50-80mm). It is compatible with different rail models (e.g., 50kg/m, 60kg/m).
Bolt hole configuration: A 6-hole design (3 pairs of bolts) is common. The bolt spacing matches the size of the rail web, ensuring uniform distribution of clamping force.
2.Materials and Performance
Steel types:
Carbon structural steel (Q235B):
It has basic strength (tensile strength ≥ 785MPa) and is suitable for medium and low-speed lines.
High-strength low-alloy steel (e.g., Grade 55 steel):
After quenching and tempering, its tensile strength reaches ≥ 1080MPa, with fatigue resistance improved by 30%, making it suitable for heavy-haul railways.
Composite materials:
Polyurethane resin + fiber-reinforced materials:
It has excellent insulation performance (insulation resistance ≥ 10⁶Ω), corrosion resistance (salt spray test > 1000 hours), and is 40% lighter than steel. It is applicable to electrified railways or corrosive environments.
3.Mechanical Properties
Load-bearing capacity:
Ordinary steel type: It can withstand 200-300kN of longitudinal tensile force, meeting the requirements of passenger and freight trunk lines.
High-strength type:
It can withstand over 400kN of tensile force, suitable for heavy-haul trains with an axle load ≥ 25 tons.
Deformation resistance:
Within the temperature range of -40℃ to 80℃, the elastic deformation of the bulged section is ≤ 0.5mm, ensuring stable connection under extreme climates.
4.Installation and Maintenance
Convenience:
The installation method is the same as that of ordinary fish plate, requiring only 6 bolts for fixation and being compatible with existing track maintenance tools.
Maintenance requirements:
Regular inspection of bolt torque is required (usually 200-300N・m) to prevent loosening caused by vibration.
For composite types, the integrity of the surface coating needs to be checked to avoid ultraviolet aging.
5.Environmental Adaptability
Corrosion resistance:
The surface is treated with hot-dip galvanizing (zinc layer thickness ≥ 80μm) or graphite coating, which can resist erosion from acid rain, salt spray, etc. Its service life is 5-8 years longer than that of ordinary fish plate.
High and low temperature resistance:
Steel types maintain toughness at -50℃, while composite types can work stably in environments ranging from -60℃ to 120℃.
We can provide different fish plate according to requirements. Welcome to call or write to us for inquiries!
Advantages
How to Find a Qualified Rail Fastener Manufacturer?
Please choose LTRF.
Why Choose LTRF?
- Strong Technical Expertise
LTRF boasts a dedicated R&D center. Moreover, it maintains long-term collaborations with major industry players such as China Railway, CRCC, and the Academy of Railway Sciences. In addition, it also partners with leading railway universities. As a result, LTRF has been able to develop various innovative fastening systems for both domestic and international markets. Notably, all these systems possess independent intellectual property rights. Indeed, to date, LTRF holds over 30 invention and utility model patents.
- Professional Manufacturing
LTRF always aims for the best. We carefully choose the materials we use and make sure every part is made with great care and skill. And we believe in doing things perfectly, so we keep coming up with new ideas and check the quality of our products very carefully to make sure they’re good.
We work fast to make sure you get your order on time. And we offer good service before and after you buy something. At LTRF, we also focus on what our customers need. We’re committed to making good products and providing great service in everything we do.
LTRF control the cost of each process, and the finance department updates the cost calculation regularly.
Furthermore, LTRF’s advanced testing equipment endows the company with comprehensive quality inspection capabilities for the entire fastener system. This meticulous quality-control measure is crucial for ensuring product reliability. Importantly, LTRF holds ISO and CRCC certification for railway products. These certifications not only demonstrate the company’s compliance with international and industry-specific standards but also enhance its credibility in the market.
