China Railway Construction Heavy Industry applies for folding boom system patent; folding boom system can reduce costs and improve operational safety

On March 22, the State Intellectual Property Office’s information shows that China Railway Construction Heavy Industry Group Co., Ltd. has applied for a patent titled “Foldable Arm System and Tunnel Construction Machinery.” The application publication number is CN121701087A, the application number is CN202511989331.7, with a publication date of March 20, 2026, and an application date of December 26, 2025. Inventors are Zhang Haitao, Ouyang Xinchí, Fu Qing, and Wang Jie. The patent agency is Beijing Chaofan Hongyu Intellectual Property Agency Co., Ltd., with patent agent Liu Zeng. The classification codes are E21B15/00 and E21D20/00.

The patent abstract describes a foldable arm system and tunnel construction machinery, involving the technical field of construction machinery. It includes a mounting seat, a pitching hinge seat, a first pitching telescopic device, a folding telescopic device, and multiple foldable arms. The pitching hinge seat is rotatably connected to the mounting seat. One end of the first pitching telescopic device is rotatably connected to the mounting seat, and the other end is rotatably connected to the pitching hinge seat. Each foldable arm includes a first link, a second link, a hinge support, and a force transmission link. Between adjacent foldable arms, the first and second links of the arm farther from the mounting seat are rotatably connected to the hinge support of the closer arm, and the force transmission link of the closer arm is rotatably connected to the second link of the farther arm. The foldable telescopic device cooperates with the foldable arms. This system can reduce the number of drive sources, lower failure rates, decrease costs, and improve operational safety.

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 high-end equipment manufacturing enterprise, mainly engaged in equipment such as tunneling machines, with full industry chain advantages and significant investment value.

The company’s industry classification is Mechanical Equipment - Construction Machinery - Complete Construction Machinery. It involves concepts like railway infrastructure, government holding, and state-owned enterprise reform. Its main business includes design, R&D, manufacturing, sales, leasing, and services for tunneling equipment, rail transit equipment, and specialized machinery.

In 2025, China Railway Construction Heavy Industry’s revenue reached 10.045 billion yuan, ranking 2nd in the industry (out of 2), below the first-place Shantui Co., Ltd., which had 14.62 billion yuan. The industry average and median are both 12.333 billion yuan. Its main business revenue was 9.972 billion yuan, accounting for 99.27%, with other (supplementary) revenue of 72.84 million yuan (0.73%). Net profit in 2025 was 1.483 billion yuan, ranking 1st in the industry (out of 2), higher than the second-place Shantui’s 1.214 billion yuan, with the industry average and median at 1.349 billion yuan.

Recent patent applications by China Railway Construction Heavy Industry are as follows:

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