| 摘要 |
Apparatus and method for unloading a fine powder-like pulverulent material from bags and mixing it with a liquid carrier in preparation for its use, while at the same time minimizing the potential for liberation of the particulate into the environmental air. Very finely particulate or flour-like pulverulent material is transferred by dumping it into a hopper. The pulverulent material is then mixed with a liquid carrier by a venturi that is located within a valve controlled, pump energized liquid circulation conduit system having connection with a supply vessel to circulate the mixture within the circulation vessel and supply vessel and thereby maintain an efficient liquid/pulverulent mixture that it is readily available for use. To minimize the potential for development of a potentially explosive or otherwise hazardous condition as the powder-like pulverulent material is transferred by dumping into the hopper of the system, the hopper is provided with an air by-pass system that is responsive to suction of the venturi to maintain the hopper under negative air pressure so that any pulverulent material that might have become entrained in the environmental air during material dumping will be drawn toward the bottom outlet of the hopper. Electronic control circuitry of the system ensures its timed and controlled operation and ensures that, if the system should shut down for any reason, a system flushing sequence must run to its completion to restore it to a clean condition for efficient use. |
