| 摘要 |
<p>A method for pneumatically conveying incoherent solid materials (e.g. cereals, cement and the like) is disclosed, in which impulsive gas jets (generally air jets), impressed at time intervals to discrete points of a conveying pipeline, cause the material to be advanced stepwise therealong. Valve means are provided for synchronizing the impulsive gas jets with the closing of the pipeline section concerned and with the opening of a gas vent upstream of each gas jet, as well as with the opening of the pipeline and the closing of the gas vent downstream of each gas jet. The gas jets and the valve means thus become operative alternatingly and there are instants of time in which the individual discrete heaps of the material are thrust forward, and others, conversely, in which they are stationary. The invention also provides a system for pneumatically conveying incoherent solid materials, which can be embodied as a plurality of modular units: this fact enables any system made according to this invention to be extended and enlarged as necessity demands, without rebuilding the entire system throughout. Another outstanding advance over the prior art is that pipe sections of a smaller diameter, and higher working pressures can be used, as compared with those heretofore commonly employed by the prior art.</p> |
