China Railway Construction Heavy Industry applies for patents related to pressure transmitters, connecting transmitters of different ranges in parallel, balancing the measurement range and measurement accuracy.

On March 21, the State Intellectual Property Office’s information shows that China Railway Construction Heavy Industry Group Co., Ltd. has applied for a patent titled “Pressure Transmitter Structure.” The application publication number is CN121678025A, the application number is CN202411290300.8, with a publication date of March 17, 2026, and an application date of September 14, 2024. The inventors are Liao Jinjun, Jiang Haihua, Zhou Binbin, Zhong Wen, Liu Long, Zhang Jian, Zhu Junbei. The patent agency is Changsha Qiyuan Patent Agency (General Partnership), with patent agents Zhou Xiaoyan and Zhang Yong. The classification codes are G01L15/00 and G01L19/00.

The patent abstract states that the invention relates to the technical field of pressure transmitters. It discloses a pressure transmission structure, including a pressure measurement interface, a first pressure transmitter, a second pressure transmitter, and a displacement adjustment mechanism. The first pressure transmitter includes a measurement wave spring, a balancing beam mechanism, a compensation beam mechanism, and an output mechanism. One end of the measurement wave spring communicates with the pressure measurement interface, and the other end is hinged to the input end of the balancing beam mechanism. The output end of the balancing beam mechanism is equipped with a baffle. The output mechanism has a nozzle facing the baffle, used to output the back pressure increment between the nozzle and the baffle. The displacement adjustment mechanism includes a displacement adjustment component and a connecting pipe; one end of the displacement adjustment component is hinged to the compensation beam mechanism of the second pressure transmitter, and the other end communicates with the output end of the first pressure transmitter’s output mechanism. The invention achieves different pressure readings by paralleling pressure transmitters of different ranges, providing both a large measurement range and high measurement accuracy with minimal absolute error.

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 high-end equipment manufacturing enterprise in China, mainly engaged in the research and manufacturing of tunneling machines and related equipment. The company has strong technical capabilities and produces highly reliable products.

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

In 2025, China Railway Construction Heavy Industry reported operating revenue of 10.045 billion yuan, ranking second in the industry, below the first-ranked Shantui Co., Ltd., which had 14.62 billion yuan. The industry average and median are both 12.33 billion yuan. Its main business revenue is 9.972 billion yuan, accounting for 99.27%. Net profit was 1.483 billion yuan, ranking first in the industry, above the second-ranked 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 Group Co., Ltd. are as follows:

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