Core Insights - The world's first closed energy recovery system and the largest hydraulic cylinder, both developed in Changzhou, have successfully rolled off the production line, set to be installed on the world's largest 156-meter dynamic positioning pile driver, "Tie Jian Da Qiao Zhuang 1" [1][3] Group 1: Product Specifications - The hydraulic cylinder features a diameter of 1.6 meters, a piston stroke of 21 meters, and a fully extended length of nearly 50 meters, equivalent to a 17-story building [3] - It has a rated thrust of 5,000 tons, capable of lifting 3,500 family cars simultaneously, making it the largest in terms of weight, diameter, length, and thrust globally [3] Group 2: Technological Advancements - The development involved collaboration between China Railway Construction Bridge Bureau, leading domestic enterprises like Hengli Hydraulic, and renowned universities, forming a comprehensive industry-academia-research application system [6] - The project team addressed significant manufacturing challenges, achieving a straightness error of less than 0.2 millimeters for a 24.6-meter-long piston rod, ensuring high reliability and durability [6] Group 3: Energy Efficiency and Environmental Impact - The newly developed system incorporates a closed energy recovery system, achieving a 40% energy recovery rate by converting braking energy into electrical energy during various operational conditions [10] - Compared to traditional open systems, the closed hydraulic system reduces the hydraulic oil tank volume from 55 cubic meters to 48 cubic meters, freeing up valuable space for equipment and personnel [10] Group 4: Strategic Importance - The 156-meter dynamic positioning pile driver will first be deployed for the Salvador Cross-Sea Bridge in Brazil, contributing to the "Belt and Road" initiative and marking a significant milestone for China's high-end marine engineering equipment in global infrastructure [13] - This delivery breaks the foreign monopoly in the ultra-large hydraulic component sector, establishing complete autonomy from core components to systems, thereby strengthening China's capabilities in deep-sea engineering and offshore wind power construction [15]