BOARD FOR CONTROL OVER GAS RELEASE FROM EXPOSED COAL SEAM SURFACE Russian patent published in 2014 - IPC E21F7/00 

FIELD: mining.

SUBSTANCE: proposed board comprises take-down chamber with central bore connected with pipe feeding gas mix to gas mix quantity control assy. Take-down round chamber has seal from flexible gastight material secured to contact surface with coal seam. Rigid pipe with fixed nut at pipe inner part extends through central bore in take-down chamber, with resilient sleeve pressed by press-washer and fixed nut. Seal is fitted on said pipe from outside to contact with take-down chamber outer side and to be clamped by press-washer and moving nut. Note here that pipe part between analysed coal seam section and take-down chamber has a perforated element.

EFFECT: higher accuracy of measurements, ruled out gas losses.

1 dwg