ABRASIVE BLASTING APPARATUS

摘要

A blasting apparatus comprises a pressure vessel (1) adapted to contain a particulate blasting medium and a liquid. The vessel (1) includes an inlet and a bottom outlet (7). The interior of the vessel (1) communicates via its bottom outlet (7) with an opening (37) in a conduit (11) along which conduit (11) an entraining pressurized gas can be fed from a pressurizing gas source. The flow of pressurized fluid through the conduit (11) entrains the contents of the vessel (1) for dispersal into the fluid flow for blasting through a delivery line connected to the conduit (11). A pressurizing means (13) is provided to pump liquid from a liquid source into the vessel (1) behing its contents in terms of its contents' outflow from the vessel (1) through the bottom outlet (7). A valve means (18, 19) is provided to control the flow of pressurized gas along the conduit (11). Immediately upstream of the opening (37) in the conduit is located a venturi (38) so that the velocity of the pressurized gas is increased as it passes over the opening (37) thereby increasing the quantity of particulate blasting medium entrained by the gas.