Rail transit is an important part of modern urban transportation. The quality of its core components directly affects the reliability of vehicle operation and the comfort of passengers. Among many key components, sealing strips are the core components to ensure the air tightness, sound insulation and safety of vehicles. Their production process and technological innovation have always been the focus of industry attention. Relying on long-term technical accumulation, Hengcheng Rail Transit Sealing Strip Factory has gradually formed a complete technical system covering material research and development, process optimization and quality control.
In the field of material research and development, we use polymer composite modification technology to break through traditional limitations. With EPDM as the main material, through nano-silicon dioxide enhancement, silane coupling agent modification and other processes, the elastic modulus of rail transit sealing strips can be kept stable under -50℃ to 120℃ working conditions. For different application scenarios, the R&D team has developed a diversified material system such as silicone rubber and TPE. Among them, the weather-resistant formula has a compression permanent deformation rate of less than 15% after 3000 hours of UV aging test, which is far higher than the industry standard and meets the stringent requirements of rail transit equipment for long-term service.
In terms of production technology, Hengcheng Factory has built an intelligent production system. Precision extrusion molding technology combined with digital control system ensures the accuracy and consistency of the cross-sectional dimensions of rail transit sealing strips. In the vulcanization process, new energy utilization methods are used to optimize the process flow, which not only improves production efficiency but also achieves the goal of green manufacturing. In response to the production needs of special-shaped parts and complex structural parts, innovative multi-dimensional molding processes are applied, combined with intelligent mold design technology, to effectively solve technical problems such as uneven flow of rubber materials and ensure the integrity of the internal structure of rail transit sealing strips.
Quality control runs through the entire process from raw materials to finished products. Fourier infrared spectrometer is used to verify the molecular structure of raw materials during the warehousing stage, and online X-ray detection equipment is configured during the production process to automatically identify internal defects. In addition to conventional tensile strength and compression rebound tests, a dynamic air tightness test bench is specially added for finished product testing to simulate the air pressure fluctuation environment when the vehicle is running. All rail transit sealing strips have passed the EN45545-2 rail transit material fire protection certification, and the smoke toxicity index reaches S2 level, building a three-dimensional safety barrier for passengers.
Driven by the concept of sustainable development, Hengcheng Factory actively explores clean production models. Through process innovation, we can achieve the recycling of production waste, promote environmentally friendly auxiliary materials, and effectively reduce the ecological impact of the production process. At the same time, we cooperate with scientific research institutions to develop new bio-based materials to promote the industry’s transformation towards a low-carbon direction. In terms of intelligent upgrading, we can achieve real-time collection and process optimization of production data through the industrial Internet of Things platform, providing digital support for quality traceability and process improvement.
From high-speed trains to urban subway cars, Hengcheng Rail Transit Sealing Strips have cumulatively served more than 20,000 carriages. In the future, we will continue to deepen industry-university research cooperation, focus on breakthroughs in cutting-edge technologies such as adaptive sealing and intelligent monitoring, and provide better sealing solutions for the upgrade and iteration of rail transit equipment.
