China Railway Construction Heavy Industry Applies for Hydraulic Arch Frame Trolley Patent, Ensuring Smooth Lifting and Lowering Under Normal Conditions and Safe Personnel Evacuation During Faults

March 21 News: According to information from the China National Intellectual Property Administration, China Railway Construction Heavy Industry Group Co., Ltd. has applied for a patent titled “Hydraulic System and Arch Frame Carriage.” The application publication number is CN121701536A, the application number is CN202511939201.2, the publication date is March 20, 2026, and the application date is December 22, 2025. The inventors are Liu Wei, Yang Xiaoqiang, Teng Jintu, and Yang Zan. The patent agency is Beijing Chaofan Hongyu Intellectual Property Agency Co., Ltd., with patent agent Cao Can. The classification codes are F15B20/00, B66F17/00, B66F11/04, E21D11/40.

Patent Abstract: The application discloses a hydraulic system and arch frame carriage. When the main pump operates normally, the first emergency valve is closed, and the hydraulic fluid is output from the main pump, controlled by the first directional valve, and selectively enters the main boom tilting cylinder’s rod chamber or non-rod chamber via the first balancing valve, achieving smooth lifting and lowering of the main arm. At this time, the first balancing valve remains conductive, ensuring rapid response and stable pressure of the cylinder, meeting the operational accuracy and dynamic performance requirements of high-altitude work platforms. When the main pump fails or unexpectedly stops, the system automatically triggers an emergency response mechanism, opening the first emergency valve, connecting one chamber of the main boom tilting cylinder (rod chamber or non-rod chamber) with the oil tank to form a pressure relief channel, allowing hydraulic fluid to return to the tank. The cylinder is shortened or extended under the platform’s gravity, causing the platform to slowly descend by its own weight, ensuring the safe evacuation of personnel on the platform and preventing casualties caused by free fall.

China Railway Construction Heavy Industry was established on November 23, 2006, and listed on the Shanghai Stock Exchange on June 22, 2021. Its registered and office address is in Changsha, Hunan Province. It is a leading domestic manufacturer of high-end underground engineering equipment, with core businesses including tunneling machines and related equipment, possessing full industry chain advantages.

The company’s industry classification is Mechanical Equipment - Engineering Machinery - Complete Engineering Machinery, involving concepts such as railway infrastructure, government holding, and state-owned enterprise reform. Its main business includes designing, developing, manufacturing, selling, leasing, and servicing tunneling machines, rail transit equipment, and specialized professional equipment.

In 2025, China Railway Construction Heavy Industry achieved revenue of 10.045 billion yuan, ranking second in the industry, behind the top-ranked Shantui Co., Ltd., which had 14.62 billion yuan. The industry average and median are both 12.33 billion yuan. Main business revenue was 9.972 billion yuan, accounting for 99.27%, with other (supplementary) revenue of 72.84 million yuan, accounting for 0.73%. Net profit in 2025 was 1.483 billion yuan, ranking first in the industry, with Shantui second at 1.214 billion yuan. The industry average and median net profit are both 1.349 billion yuan.

Recent patent applications by China Railway Construction Heavy Industry include:

(Note: The table continues with additional patents as listed in the original document.)

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