Sentence examples for coal drill from inspiring English sources

Thus the coal drill pipe can move forwards and backwards (Fig. 3b).

A thread-cutting coal drill pipe exists inside the box body, which is used to simulate the mining work face.

Two strip holes lie on both sides of the overlap of the primary and the auxiliary boxes, which provides a moving pathway for the coal drill pipe.

To observe the coal drill pipe movement, a window is set at the sealing cover of one of the auxiliary boxes.

Thread pipes on two sides of the primary box are driven by a motor arranged perpendicularly to the coal-cutting shaft, and two sliders fixed with a coal drill pipe are driven by a thread pipe.

Roger's father had been hurt running a coal drill.

The underground trial of the miners began on Wednesday when their coal drilling machine unexpectedly broke open the abandoned mine, which had been thought to be remote enough from the Quecreek mine to pose no danger.

While natural gas burns a lot cleaner than coal, drilling and pipelines are never popular with the locals.

High strength reinforced concrete drilling shaft linings have been adopted to solve the difficult problem of supporting coal drilling shafts penetrating through thick top soils.

There's no excuse for blasting the mountains of Appalachia to scrape the last bits of coal, drilling in our Arctic wilderness, building export terminals to ship coal and natural gas overseas, or continuing to allow the proliferation of under-regulated fracking for oil and gas.

As Lemonick correctly points out, natural gas produces carbon dioxide (albeit less than coal), drilling for natural gas releases methane (a potent greenhouse gas), another shift in the economy could shift folks from natural gas back to coal, and (despite the U.S. emissions reduction) the world's overall emissions continue to increase.