Application of FGI four-quadrant master-slave high voltage frequency inverter in Asia's first deep shaft

Recently, Shandong Laizhou Bay came the good news, Asia's first deep shaft Sanshandao auxiliary shaft construction successfully broke the kilometer mark, FGI high pressure four quadrant frequency conversion speed regulation system plays a role in the super deep shaft upgrade electric control system, further promote the national "13th Five-Year" key research and development plan "deep metal mine construction and upgrade key technology" demonstration project completed as scheduled.

At present, the deepest record of super deep shaft sinking in China is less than 1600 meters, and there is no mature construction experience in the construction of deep shaft above 1500 meters. Sanshandao auxiliary well is a submarine excavation project with a total depth of 1,915 meters after completion of construction. It belongs to ultra-deep shaft, which is mainly faced with complex well construction conditions such as large formation stress, large rock fissure seepage water pressure and strong corrosion, complex and variable geological conditions, and increasing well temperature, and is easy to induce various risks such as large deformation of surrounding rock, rock burst, and water gusher of working face.

The Gold Sanshandao auxiliary well in Shandong province is located in Laizhou Bay, and all its deposits exist below sea level in Laizhou Bay of Bohai Sea. The geological conditions are complex, so it is particularly important to improve the safe and stable operation of the electronic control system, and also put forward extremely high requirements for the reliability of the electronic control system equipment.

Sanshandao auxiliary shaft lifting system is equipped with 2 sets of 5 meters diameter shaft lifting machine developed and produced by 900 million Heavy Industry, using the newly developed advanced double motor double reducer double-side drive mode, configured with 4 sets of FGI high-pressure four-quadrant frequency conversion speed control system, to achieve the improvement of the unattended function of the machine room, the efficiency increased by 30%.

The hoisting system of Sanshandao auxiliary shaft adopts the mode of two motors dragging a drum at the same time. When the two motors work at the same time, it is dual machine working mode. The use of master-slave control and dual motor coaxial function can promote greater load. The single-machine operation mode guarantees the efficiency and safety of the motor in the early stage of well construction.

The auxiliary shaft excavation project of Sanshandao Gold Mine is a key construction project of Shandong Gold Group. The net diameter of the auxiliary shaft is 10.5 meters, the excavation diameter is 11.5 meters, and the design shaft depth is 1,915 meters. It is the first deep well under construction in Asia, the fifth deep well in the world, and the only submarine shaft project in China.

"Battle deep shaft promotion! The conditions of the underground brothers are so difficult that we must ensure the safety of transportation of deep shaft hoisting." The electromechanical manager used to say that at the pep rally. At this time, the two 5-meter-diameter shaft lifting machines on the construction site are running smoothly to protect the shaft lifting; FGI high pressure hoist frequency conversion electric control system, always ensure 2000 meters shaft lifting transportation safety.