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11
2021-05
Low pressure gas-liquid driven reamer
In recent years, a variety of technologies have been developed and applied in coal seam permeability increasing mining technology, and many schemes have been discussed and used in many areas for coal seam gas extraction technology in bottom drainage tunnel. At present, the most widely used hole bottom hole drilling technology is an effective solution to increase the concentration of gas extraction. Using high-pressure water to punch holes can quickly and effectively achieve the purpose of hole bottom hole making, the water jet is used to break and cut the coal seam in the relative position, which increases the local space and thus improves the gas extraction rate. However, in case of soft coal seam with excessive gas content and loose coal quality, the coal powder is washed with high-pressure water, which is easy to cause the foaming flow of coal powder.
2021-05-11
09
2021-05
07
2021-05
May 4th Youth Day | Youth agitation, flying dreams
May 4th Youth Day | Youth agitation, flying dreams
2021-05-07
07
2021-05
May Day pays tribute to the most beautiful workers | | YiKuang Technology
May Day pays tribute to the most beautiful workers | | YiKuang Technology
2021-05-07
30
2021-04
May Day pays tribute to the most beautiful workers | | YiKuang Technology
International Labor Day, also known as "May Day International Labor Day", "International Day of demonstrations"(International Workers 'Day or MayDay), is a national holiday in more than 80 countries in the world. Set on May 1st every year. It is a festival shared by working people all over the world. In July 1889, the Second International, led by Engels, held a congress in Paris. The meeting passed a resolution stipulating that international workers will hold a parade on May 1, 1890, and decided to designate May 1 as International Labor Day. The Central People's Government Administration Council in 1949 1
2021-04-30
26
2021-04
Experimental Study on Drilling, Sealing and Injection Integrated Anchoring of Soft Broken Coal
Experimental Study on Drilling, Sealing and Injection Integrated Anchoring of Soft Broken Coal
2021-04-26
25
2021-04
22
2021-04
Yikuang Technology invites you to participate in the 20th 2021 Taiyuan Coal (Energy) Industrial Technology and Equipment Exhibition
2021-04-22
