Abstract: The standard drill pipe for drilling in coal mine gallery is one of the main drilling tools in underground coal mine drilling. Its reliability directly affects the safety and efficiency of ...
Don't miss a story. Get San José Spotlight headlines delivered to your inbox. Silicon Valley transit officials are moving forward with plans to dig a single tunnel and close their BART extension ...
Abstract: As the key component of the tunnel boring machine (TBM), the main bearing supports the cutter head as it rotates and breaks rock. It is commonly operated in low-speed, heavy-load, and ...
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