The latest data released by the National Energy Administration shows that in 2023, the total installed capacity of wind and solar power exceeded 1 billion kilowatts, consolidating its dominant position in the new installed capacity of electricity. The wind turbine gearbox is one of the most technologically advanced components in wind turbines, mainly used to transfer the power generated by the wind turbine under the action of wind to the generator and obtain the corresponding speed. Since 2013, Nanjing High Speed Gear Manufacturing Co., Ltd. (hereinafter referred to as "Nangao Gear") has ranked first in the global segmented market of wind power gearboxes for 11 consecutive years. It can supply a full range of wind power gearboxes ranging from 1.5 MW to 18 MW in bulk, and its products are sold to more than 30 countries and regions worldwide. At present, the main gearbox of Nangaochi wind power accounts for nearly 60% of the domestic market share and over 30% of the global market share. One out of every three new wind turbine main gearboxes added globally comes from Nangaochi. "Nowadays, there is a high demand for wind power products, and there is a high demand for gearbox maintenance technology and cost." Zhang Xun, the customs manager of Nanjing High Speed Gear Manufacturing Co., Ltd., told reporters that a deposit needs to be paid for each import declaration of repaired products, and the deposit will be refunded after the repair is completed and the products are transported back to export. The maintenance cycle usually takes three to five months, which puts a lot of pressure on the capital occupation. Zhou Ming, Deputy Director of Xinshengwu Customs under Nanjing Customs, said that relying on the "zero enterprise problem clearance" mechanism, the customs quickly established a special team to tailor solutions for enterprises and apply the new model of customs tax guarantee after thoroughly understanding the problem needs of enterprises. Enterprises only need to provide a tax guarantee letter or policy to the customs, which can be used by the customs in multiple declared places listed by the enterprise. The guarantee amount of guarantees and policies will be automatically restored after the verification of the guarantee, and can be reused during the validity period. Some guarantee institutions can also handle tax guarantee business online throughout the entire process, eliminating the need for frequent transactions. "Starting from March this year, after adopting this new model, the company has reduced its turnover links. As of now, it has saved nearly 10 million yuan in occupied capital costs, which greatly helps the enterprise expand production capacity and invest in research and development of new products. According to customer demand forecasts, the company's export volume is expected to increase by about 15% compared to 2022 for the whole year." said Zhang Xun. Sun Yizhong, the R&D director of Nangaochi, said that in the past, wind power gearboxes were mainly based on small megawatts. With the large-scale development of wind power gearbox products, the 13.6-megawatt wind power gearbox of Nangaochi has even reached a weight of 100 tons. Such a behemoth needs to operate continuously at altitudes of over 100 meters, with a safe operating cycle of over 20 years. Key technologies need to be overcome in various stages of design, research and development, and production. In recent years, on the one hand, raw material prices have been continuously rising; On the other hand, customers constantly demand price reductions. As a part of the wind turbine industry chain, gearbox accounts for about 15% of the cost of wind turbines, and innovation has become the most important measure for Nangao Gear to achieve high-quality development in the era of wind power parity. Zhao Yin, the procurement manager of Nangaochi, gave an example that the sliding bearings in wind power equipment were mainly imported brands, and a considerable profit was taken away by the brand. Since 2015, Nangaochi has been tackling and promoting this technology, greatly reducing costs. Focusing on new quality productivity requires