Inflatable pad for mine explosion stopping - uses pressure fluid to force original gas filling out leaving small amount of gas as cushion giving resilience

摘要

Inflatable pad stopping filling system for use in mines as explosion, gas etc. barrier in roadways relies on an entry and sealing valve in the pad base and a relief valve in the upper part. The pad is first filled with pressurised gas (5) until it adapts to the roadway section, whereupon the pad is filled with a pressure fluid (4) which drives the original gas out and only leaves enough to form a pressure cushion inside the pad. Preferably the gas should be introduced at overpressure of 800 mm. WG, using separate entries for gas (22) and fluid, each fitted with a fluid level indicator. The pad should preferably be semi-cylindrical in shape, and may be coupled to a pulse filling line and is controlled from a remote centre.