A mixing-extruding head apparatus for a three-dimensional (3D) printer for building residential houses and other objects, which enables printing of right-angled corners, the apparatus comprising a container for mixing mortar, the container comprising a funnel (1), a two-part helix (6) inside the container for mixing the mortar for building said objects, wherein the two-part helix (6) is installed on a main axis (2) inside the funnel (1) and the helix (6) comprises an inner metal part (6a) and an outer rubber part (6b), and wherein the helix (6) has at least one thread (turn), and an exit nozzle (14). The bottom part of the exit nozzle (14) is on each of its sides equipped with one of four blades (17), which are controlled by a servo-pneumatic system with computer-controlled commands for building the objects, wherein each of the blades is connected to a piston moved by a pneumatic cylinder; wherein all four pneumatic cylinders are connected with four electromagnetic valves, which generate pneumatic signals.

A mixing blade for a mixer for concrete, mortar, powders, dry or semi-dry granulates, mixtures with a cement base or similar or comparable mixtures or mixes comprises a shank which develops along a longitudinal axis and a mixing wall connected inclined to one end of said shank, transverse to the longitudinal axis. The mixing wall comprises, on one side of the longitudinal axis, a first front mixing plate, and on an opposite side, a second front mixing plate angled backward toward the longitudinal axis with respect to the first front mixing plate, by an angle of inclination of the plate.

A mixing blade for a mixer for concrete, mortar, powders, dry or semi-dry granulates, mixtures with a cement base or similar or comparable mixtures or mixes comprises a shank which develops along a longitudinal axis and a mixing wall connected inclined to one end of said shank, transverse to the longitudinal axis. The mixing wall comprises, on one side of the longitudinal axis, a first front mixing plate, and on an opposite side, a second front mixing plate angled backward toward the longitudinal axis with respect to the first front mixing plate, by an angle of inclination of the plate.

There is provided apparatus (301) for mixing contents of a receptacle, the apparatus comprising a rotary shaft (302) equipped at a proximal end with a connection for removable attachment to a means of providing rotation. The rotary shaft has a mixing element (303) fixedly connected at a distal end of the shaft opposite to said proximal end. The mixing element comprises at least two arms (304) at the distal most end of the shaft, a corkscrew neck (306) on the shaft and a collar (305) on the shaft positioned in between the at least two arms and the corkscrew neck. The at least two arms are configured in a first partially-open resting position and are moveable to a second fully-open operative position. The mixing element further comprises a blade (307) positioned across the shaft more proximally than the corkscrew neck.

There is provided apparatus (301) for mixing contents of a receptacle, the apparatus comprising a rotary shaft (302) equipped at a proximal end with a connection for removable attachment to a means of providing rotation. The rotary shaft has a mixing element (303) fixedly connected at a distal end of the shaft opposite to said proximal end. The mixing element comprises at least two arms (304) at the distal most end of the shaft, a corkscrew neck (306) on the shaft and a collar (305) on the shaft positioned in between the at least two arms and the corkscrew neck. The at least two arms are configured in a first partially-open resting position and are moveable to a second fully-open operative position. The mixing element further comprises a blade (307) positioned across the shaft more proximally than the corkscrew neck.

A burner system for heating the material product, i.e., asphalt, includes a burner kettle designed with a thicker bottom heat transfer plate, added heat transfer oil (HTO) circulation pumps, a spiral circulation ring and heat restriction rings. The spiral circulation ring spirals up the burner kettle to move the HTO around the entire circumference of the burner kettle to eliminate hotspots. An HTO pump moves cooler oil from the top of the kettle directly across the hottest part of the bottom of the kettle, i.e., across the heat transfer plate. Keeping this zone cool will eliminate heat stress of the material. Heat restriction rings direct the heat back and forth throughout the burner kettle for increased efficiency.

A burner system for heating the material product, i.e., asphalt, includes a burner kettle designed with a thicker bottom heat transfer plate, added heat transfer oil (HTO) circulation pumps, a spiral circulation ring and heat restriction rings. The spiral circulation ring spirals up the burner kettle to move the HTO around the entire circumference of the burner kettle to eliminate hotspots. An HTO pump moves cooler oil from the top of the kettle directly across the hottest part of the bottom of the kettle, i.e., across the heat transfer plate. Keeping this zone cool will eliminate heat stress of the material. Heat restriction rings direct the heat back and forth throughout the burner kettle for increased efficiency.

The present invention relates to a mixer, preferably to a ring-pan mixer, having a mixing trough and a mixer rotor that is rotatable via a drive motor about a substantially vertical axis of rotation and at which at least one mixing tool drivable via a separate drive motor is arranged rotatable about a separate axis of rotation, wherein the drive speeds of the mixer rotor and of the at least one mixing tool can be set independently of one another, with the mixer rotor and the at least one mixing tool being able to be set via a transmission independently of one another.

A technique facilitates mixing of cement slurry for use in a cementing application. At least one cement mixer is provided with a tank, e.g. a conical tank, having a powder cement blend inlet and a mixing liquid inlet. A cement slurry discharge may be positioned generally beneath the tank. A mixing assembly also is positioned below the tank and driven by a shaft. The mixing assembly is exposed to an interior of the tank and is used to mix the cement slurry when rotated by the shaft and to direct the cement slurry out through the cement slurry discharge. Additionally, a recirculation system comprises an inlet positioned to receive a portion of the cement slurry mixed in the mixing assembly. The recirculation system also comprises an outlet positioned to direct the portion back into the mixer to enhance mixing effects.

A stirrer (1; 100) for stabilizing liquid binding unfinished products intended to form ceramic items comprising a support shaft (2) individuating a longitudinal rotation axis (Y) and contained into a mixing tank (V) of the liquid binding unfinished product, motorization means (3) operatively connected with the support shaft (2) in order to rotate it around the longitudinal axis (Y), and a main operating blade (4), coupled with the support shaft (2) through interconnection means (5) in such a way as to be contained into the mixing tank (V) in order to interfere with the liquid binding unfinished product and cause its continuous mechanical mixing action inside the mixing tank (V) itself when the support shaft (2) rotates around the longitudinal axis (Y). In this case, the stirrer (1) includes a thermoregulation circuit (6), which extends within the support shaft (2) and within the main operating blade (4) and is connected with an external source for supplying a heat transfer fluid crossing the thermoregulation circuit (6) in such a way as to exchange heat with the liquid binding unfinished product within the mixing tank (V), in order to bring the it to a predefined temperature, while the support shaft (2) and the main operating blade (4) integral with it rotate around the longitudinal axis (Y).