Yankuang Energy has obtained patents related to mine self-closing doors. The mine sliding doors automatically close using gravity to ensure safety.

On March 28, news was reported that the National Intellectual Property Administration’s information shows that Yanzhou Coal Mining Company Limited has applied for a patent titled “A Self-Weight Return Type Self-Closing Sliding Door for Mines,” with authorization announcement number CN224049246U, and the authorization announcement date is March 27, 2026. The application number is CN202422760787.3, the application publication date is March 27, 2026, the application date is November 13, 2024, and the inventors are Bian Hongxing, Liu Liye, Wang Lixin, Wang Guoliang, Xiao Min, Lu Di, Cong Shengjie, Wang Bo, and Xu Xiaojie. The patent agency is Beijing Hongquan Intellectual Property Agency Co., Ltd., with patent agents Xu Weiqun and Zhao Yunping, and classification numbers E21F1/10, E21F1/12.

The patent abstract indicates that this application provides a self-weight return type self-closing sliding door for mines, including: a bottom frame, a top frame; the two ends of the bottom frame are connected to the two ends of the top frame through side frames to form a square frame structure; a fixed door located between the bottom frame and the top frame; a personnel passage formed between the two fixed doors; a door body formed by two movable doors that completely covers the personnel passage; the top end of the movable door is slidably connected to a first sliding rail set in the top frame; the bottom end of the movable door is slidably connected to a second sliding rail set in the bottom frame; the horizontal height of the first sliding rail increases sequentially from the center position to both ends. The embodiment of the self-closing sliding door for mines provided by this application, through the design of the horizontal height of the first sliding rail, allows the movable door that moves along the first sliding rail to automatically return to the closed position under the action of gravity after being manually opened, which facilitates operation and ensures the safety of mining operations.

Yanzhou Coal Mining was established on September 25, 1997, and was listed on the Shanghai Stock Exchange on July 1, 1998, with both the registered address and office address in Shandong Province. It is a leading coal enterprise in China, with core business covering coal and related industries, possessing a full industry chain advantage and significant investment value.

The main business of Yanzhou Coal Mining includes coal mining, washing and processing, sales, and coal railway transportation, as well as coal chemical and power businesses, and it falls under the Shenwan industry of coal - coal mining - thermal coal, involving concepts such as thermal coal, coal concepts, and anti-involution.

In 2025, Yanzhou Coal Mining’s operating income reached 144.933 billion yuan, ranking second among six enterprises in the industry, with the industry leader, China Coal Energy, at 148.057 billion yuan, the industry average at 58.863 billion yuan, and the median at 25.552 billion yuan; the net profit was 14.226 billion yuan, also ranking second in the industry, with the leader China Coal Energy at 21.839 billion yuan, the industry average at 6.588 billion yuan, and the median at 2.224 billion yuan.

The recent patent situation of Yanzhou Coal Mining Group Co., Ltd. is as follows:

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Editor: Xiaolang Express News