Omen and Prevention of Coal Mine Roof Fall Accidents

The roof is in short, that is, the air duct collapses. According to the extent of the roof's vertical fall and the severity of the casualties, common roof accidents can be divided into two categories: local roofing and large roof accidents.

Omen of.......

Rare earth ore beneficiation method and medicament

(1) Collector The research and application of flotation reagents for rare earth minerals can be divided into three stages.

Research and application of oleic acid based collector is the first stage, due to the low select.......

Use of centrifugal heat transfer oil pump

Centrifugal heat transfer oil pump plays an important role in use, according to a certain working principle to use, to ensure the display of good performance in the work. The working principle of the centrifugal heat-conducting oil pump is relatively simple, a.......

Let the black coal "green"...

Coal is an important basic energy. Since the 18th National Congress of the Communist Party of China, China's coal enterprises have actively responded to the challenges brought about by the new normal of economic development, especially the pace of resolv.......

Wuhan LED board aging test bench design points

When electronic products are subjected to high-temperature aging , they have the need for power-on and communication tests. Some electronic products are aged under the low-level process of semi-finished products, and some of them are products that are directly aged. Most o.......

Classification of broken hammers and common applications

According to the operation mode: hydraulic breakers are divided into two types: hand-held and airborne;

According to the working principle classification: hydraulic breaker is divided into three types: full hydraulic type, liquid gas combined type and nitrogen explosion type. The li.......