"Actively developing and using coal mine gas is not only an effective way to achieve a fundamental improvement in China's coal mine safety production situation, but also an important part of changing damage, profit, effective use of energy, and protection of the environment." Xu Mingming at the China International Coal Mine Gas Prevention and Utilization Conference Said.
At present, China's coal mine gas resources with good resource conditions and good prospects for development are about 16 trillion cubic meters. Among them, 40 wells in Weinan, Shanxi Province, the first gas development and production base will soon be put into production. It is estimated that more than 600 million yuan will be used for gas development throughout the country this year, and more than 330 wells will be drilled, which will exceed the accumulated investment and workload in the previous 8 years.
Experts said that although gas is a source of disasters for coal mine accidents, it is also a kind of clean energy, and it is the wealth that nature has endowed to humanity and should not be a threat to safe production. Scientifically and rationally developing and using gas, lifting coal mine safety and protecting miners' life safety are also conducive to the rational use of resources and environmental protection.
The reporter learned from the State Administration of Work Safety that 203 coal mines in the country have established gas drainage systems. At present, China's utilization rate for gas extraction is 41.1%, and it is planned to reach 50% during the “Eleventh Five-Year Plan†period. The main ways of using gas include: civil (heating, gas), power generation, industrial fuels, chemical and so on.
Plastic Injection Mold is an assembly of parts containing within it an impression into which plastic material is injected and cooled. It's the impression which gives the moulding its form. The impression may, therefore, be defined as that part of the mould which imparts shape to the moulding.
The impression is formed by two mould members:
- The cavity, which is the female portion of the mould, gives the moulding its external form.
- The core, which is the male portion of the mould, forms the internal shape of the moulding.
Cavity and core plates: This is illustrated for a simple container, the basic mould, in this case, consists of two plates. Into one plate is sunk the cavity which shapes the outside form of the moulding and is therefore known as the cavity plate.
Similarly, the core which projects from the core plate forms the inside shape of the moulding. When the mould is closed, the two plates come together forming a space between the cavity and core which is the impression.
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