Dry material transport and extrusion

A cementitious material extrusion system comprising:

• a tank configured to store dry pellets of uncured cementious material;
• a dry pellets outlet from the tank configured to deliver dry pellets from within the tank;
• a dry mixing chamber connected to the dry pellets outlet configured to receive dry pellets from the dry pellets outlet;
• a gas inlet to the dry mixing chamber configured to receive a gaseous transport stream;
• a mixer within the dry mixing chamber configured to mix the dry pellets received by the dry mixing chamber with the gaseous transport stream received by the dry mixing chamber;
• a gas/dry pellets outlet from the dry mixing chamber configured to deliver the mixture of the gaseous transport stream with the dry pellets from the dry mixing chamber;
• an outgoing transport line connected to the gas/dry pellets outlet from the dry mixing chamber configured to deliver the mixture of the gaseous transport stream with the dry pellets to a remote location;
• a separation chamber configured to separate dry pellets from a mixture of a gaseous transport stream with dry pellets and to store a quantity of the separated dry pellets;
• a gas/dry pellets inlet to the separation chamber connected to the outgoing transport line configured to receive the mixture of the gaseous transport stream with the dry pellets and to deliver the mixture into the separation chamber;
• a dry pellets outlet from the separation chamber configured to deliver dry pellets separated by the separation chamber from the mixture of the gaseous transport stream with the dry pellets;
• a wet mixing chamber connected to the dry pellets outlet from the separation chamber configured to receive the dry pellets from the dry pellets outlet from the separation chamber;
• a fluid inlet to the wet mixing chamber configured to receive a fluid;
• a mixer within the wet mixing chamber configured to mix the dry pellets received by the wet mixing chamber with the fluid received by the wet mixing chamber;
• a wet cementitious material outlet from the wet mixing chamber configured to deliver a wet, uncured, cementitious mixture of the dry pellets and the fluid from the wet mixing chamber;
• a valve below, in vertical alignment with, and connected by a short tube to the wet mixing chamber and configured to regulate the flow of the wet, uncured, cementitious mixture of the dry pellets and the fluid from the wet mixing chamber;
• a computer-controlled nozzle below, in vertical alignment with, and connected by a short tube to the valve and configured to receive and extrude the wet cementitious mixture of the dry pellets and the fluid;
• an overflow outlet from the separation chamber configured to vent the gaseous transport stream delivered by the gas/dry pellets inlet to the separation chamber mixed with the dry pellets which were also delivered by the gas/dry pellets inlet, but which failed to be separated by the separation chamber from the gaseous transport stream;
• a return transport line connected to the overflow outlet from the separation chamber configured to deliver the mixture of the gaseous transport stream and the overflow dry pellets from the overflow outlet to the tank;
• an overflow inlet to the tank connected to the return transport line configured to receive the gaseous transport stream mixed with the overflow dry pellets and to deposit the overflow pellets in the tank;
• and
• wherein the separation chamber, the overflow outlet from the separation chamber, the tank, and the overflow inlet to the tank are configured to cause the supply of dry pellets to the wet mixing chamber to be automatically replenished during operation of the cementitious material extrusion system without overflow of the separation chamber.