The Namdok Youth Coal Mine under the Pukchang Area Youth Coal-mining Complex takes the lion’s share of the coal supply to thermal power stations in the complex.
This year the coal mine has employed over a dozen technical innovation plans to increase coal production.
It informatized its management and operation so that it can monitor and command all production processes in real time.
Most noticeable is the improvement of the anthracite coal mining process in the coal mine.
Typical example is the introduction of the “wide-area mining method using multipurpose inertia-type loader”, which took the first place at the 34th national science and technology festival last year.
Generally, scraper chain conveyor is used for mining coal in the coal bed on normal slope, water-bearing beds and watery areas and inertia-type load-haul-dumper is suitable for mining coal in gentle slope and waterless and collapsed coal.
The multifunctional inertia-type loading and transport equipment is simple in structure and light as compared to the previous scraper chain conveyor and inertia-type load-haul-dumper, while incorporating the transport principles of them both.
“Through the test run for introduction, it proved its applicability to the characters of anthracite coal mining and advantages,” said Pak Yong Bok, coal mining workteam leader.
The coal mine also introduced plastic medal into the coal car instead of bearing.
It is said that the longer the tunnel and the more rail joints, the higher the abrasion rate of bearing of coal wagon wheels.
The technical personnel of the coal mine directed their attention to plastics among the materials to be used as a substitute for nonferrous metals. They succeeded in introducing plastic medal made from polypropylene whose industrial production is ensured at home to put coal transport on a normal footing, while saving 40 percent of materials it had used before.
The experience has now been generalized to all coal mines under the complex.
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