US 4,730,934 A · Mobile mixer, preferably having counterrotational emptying, for building materials, in particular concrete

Abstract

In a mobile mixer, preferably having counterrotational emptying, for building materials, in particular concrete, in a mixing drum (1) which, on its inner wall (9), has one or more flat elevators (11, 12) following a helix and extending from the closed drum base (2) to the drum opening (3), which elevators (11, 12) are driven about the drum axis during rotation of the mixing drum and push the building material to the front of the closed base (2) during transport and during mixing, with one or more flat sections (26, 27) which are helically curved about the mixing drum axis (4) being fixed for driving during the mixing drum rotation (5) in the mixing drum space enclosed by the elevators acting as mixing spirals (11, 12), which flat sections (26, 27) are arranged counterrotationally to the mixing spirals (11, 12) in such a way that, during the transport and during the mixing of the buiding material (13), they produce a counterflow in the building material filling core surrounded by the mixing spirals (11, 12). It is provided according to the invention that the flat sections (26, 27) start at the mixing drum base (2) and end in front of the mixing spirals (11, 12) and the mixing drum opening (3), and that the flat sections (26, 27) of the counterflow spirals (26, 27) are fixed to the elevators of the mixing spirals (11, 12) and via the mixing drum base (2) to the mixing drum wall (9).

Claims34

Dependent claims

Mobile mixer, preferably having counterrotational emptying, for building materials, in particular concrete, in a mixing drum (1) which, on its inner wall (9), has one or more flat elevators (11, 12) following a helix and extending from the closed drum base (2) to the drum opening (3), which elevators (11, 12) are driven about the drum axis during rotation of the mixing drum (1) and drive the building material in front of the closed drum base (2) during transport and during mixing, with one or more flat sections (26, 27) which are helically curved about the mixing drum axis (4) being mounted for driving during the mixing drum rotation (5) in the mixing drum space enclosed by the elevations acting as mixing spirals (11, 12), which flat sections (26, 27) are arranged counterrotationally to the mixing spirals (11, 12) in such a way that, during the transport and during the mixing of the building material (13), they produce a counterflow in the building material filling core surrounded by the mixing spirals (11, 12), wherein the flat sections (26, 27) start from the mixing drum base (2) and end in front of the mixing spirals (11, 12) and the mixing drum opening (3), and wherein the flat sections (26, 27) of the counterflow spirals are mounted to the elevators of the mixing spirals (11, 12) and via the mixing drum base (2) to the mixing drum wall (9).

A mobile mixer and transporter for building materials such as concrete, said mixer having an elongated drum and a wheel supported mount therefor, means on said mount for rotating said drum about its longitudinal axis, said drum having first and second ends;

a pair of helical primary blades secured to and adjacent the walls of said drum and forming an annulus within said drum, the direction of spiral of said primary blade being such that when said drum is rotated in one direction said primary blade will move material in said drum toward said second end, the improvement in said mixer comprising:
a pair of helical secondary blades having a direction of spiraling opposite to that of said primary blades;
said secondary blades being supported on said primary blades and forming an annulus within the central opening of said primary blades;
the spiral formed by said secondary blades having an outer diameter smaller than the inner diameter of the spiral formed by said primary blades whereby an annular space is provided between said primary and secondary blades, said primary blades extending substantially to the first end of the drum and said secondary blades terminating short of said primary blades adjacent said first end whereby they will discharge material into said primary blades for entrainment thereby, said secondary blades extending to the second end of said drum for entraining material moved to said second end by said primary blades for causing the material to counterflow from said second end and be discharged adjacent said first end.

1 more element

A mobile mixer and transporter for building materials such as concrete, said mixer having an elongated drum and a wheel supported mount therefor, means on said mounted for rotating said drum about its longitudinal axis, said drum being generally frustoconical in shape having a large diameter closed end and a small diameter open end;

a pair of helical primary blades within, secured to and adjacent the walls of said drum and forming an annulus within said drum, the direction of spiraling of said primary blade being such that when said drum is rotated in one direction said primary blade will move material in said drum toward said closed end, the improvement in said mixer comprising:
a pair of helical secondary blades having a direction of spiralling opposite to that of said primary blades;
said secondary blades being supported on said primary blades and forming an annulus within the central opening of said primary blades;
the spiral formed by said secondary blades having an outer diameter smaller than the inner diameter of the spiral formed by said primary blades whereby an annular space is provided between said primary and secondary blades, said primary blades extending substantially to the open end of the drum and said secondary blades adjacent said open end terminating short of said primary blades whereby they will discharge material into said primary blades for entrainment thereby, said secondary blades extending to the closed end of said drum for entraining material moved to said closed end by said primary blades for causing the material to counterflow from said closed end and discharging it adjacent said open end.

1 more element

Dependencies are inferred from the claim text.

Mobile mixer, preferably having counterrotational emptying, for building materials, in particular concrete

Life of this patent

Mobile mixer, preferably having counterrotational emptying, for building materials, in particular concrete

Life of this patent

Abstract

Claims34