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October 01, 2025

Automatic spray control valve general technical conditions

"Hydraulic support with automatic spray control valve – General technical conditions Ministry of Coal Industry of the People’s Republic of China, issued on December 30, 1997, and implemented on June 1, 1998. **Scope** This standard outlines the requirements for hydraulic support

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October 01, 2025

Shijiazhuang Coal Mining Company developed ZJ30 oil drilling rig

Shijiazhuang Coal Mine Machinery Co., Ltd. has made significant progress in the oil drilling industry by developing the ZJ30 drilling rig, which is entirely built on its own technological foundation and holds full independent intellectual property rights. Since its successful testing, the rig has be

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