HIGH-PRESSURE SEALING SYSTEM OF THE MAIN DRIVE OF A TUNNELLING SHIELD AND SLURRY TUNNELLING SHIELD Russian patent published in 2022 - IPC E21D9/06 

FIELD: mining.

SUBSTANCE: group of inventions relates to the field of tunnelling shields, in particular, to a high-pressure sealing system of the main drive of a tunnelling shield and to a slurry tunnelling shield containing the corresponding system. The system comprises an air buffer chamber, an oil and gas sealing chamber (P2), a compressed air input channel, a first increasing pneumatic control valve (21) and a first reducing pneumatic control valve (51). The inlet of the compressed air input channel is configured to be connected with an air source, the outlet of the compressed air input channel is connected with the inlet of the first increasing pneumatic control valve (21), the outlet of the first increasing pneumatic control valve (21) is connected with the inlet of the first reducing pneumatic control valve (51) and the oil and gas sealing chamber (P2), and the outlet the first reducing pneumatic control valve (51) is connected with the exhaust pipeline. The positive pressure measuring terminal of the first increasing pneumatic control valve (21) and the positive pressure measuring terminal of the first reducing pneumatic control valve (51) are connected with the air buffer chamber. The negative pressure measuring terminal of the first increasing pneumatic control valve (21) and the negative pressure measuring terminal of the first reducing pneumatic control valve (51) are connected with the oil and gas sealing chamber (P2). If the pressure difference between the air buffer chamber and the oil and gas sealing chamber (P2) is not lower than the first preset value, the first increasing pneumatic control valve (21) is opened, wherein the first reducing pneumatic control valve (51) is in the closed state. If the pressure difference between the air buffer chamber and the oil and gas sealing chamber (P2) is not higher than the second preset value, the first reducing pneumatic control valve (51) is therein opened, wherein the first increasing pneumatic control valve (21) is in the closed state.

EFFECT: system is configured for pneumatic closed feedback and control with servo response, is safe and reliable, and has a high degree of automation, increasing the calculated load capacity of the edge seal by pressure.

10 cl, 3 dwg