Single shaft concrete mixer Le Officine Riunite Udine S p A

The mixing hopper is made of heavy-gauge steel sheet. It is supported by two axles with four wheels that run on two guides and it is moved by two hydraulic cylinders. Inside the hopper is lined with wear-proof material subdivided into interchangeable parts. In the top part of the hopper there is the loading mouth which during loading and mixing is hermetically sealed by rubber seals in contact with the bottom part of the batching hoppers, thereby preventing dust and splashes of concrete from coming out. An inspection gate has been created on the top to view the mix. The discharging mouth is mechanically operated. During working operations it is in the middle-top part of the mixer, during unloading the tank is moved outwards and rotated to bring it down. The mixing shaft is formed by flanged arms carrying the semi-helix-shaped blades. The blades are composed of a fixed support and an interchangeable part subjected to wear. The rotation axle rests on a support subdivided into two completely separate parts. The outer part contains the bearings (on which the shaft turns). In the inner part of the mixer a set of labyrinth oil-bath seals are fitted to prevent material from coming out during mixing (automatic and manual greasing). An oil-bath reduction unit powered by a fluid power motor turns the shaft. The single-axle mixer (the heart of the system), owing to its operating system, can mix the various types of material with different specific gravities, such as light concretes, expanded concretes, expanded clay, polystyrene, sandy mixes, mortars and concretes of all classes (from S1 to S5 with no difficulty whatsoever). Owing to the layout of the helix-shaped blades which create a flow and a backflow, movement of the material inside the mixing case takes place by continuous lifting/overturning together with movements from right to left and vice versa. As may be easily understood and demonstrated, this type of motion is the most effective and allows the mixing of materials that differ from one another, both in terms of specific gravity and class (at the most the mixing time changes). In the case of very wet concretes (class S5) or with higher mixing time than standard, with this mixer no adverse effects take place on the material (segregation of materials) and no grout comes out of the discharge mouth, as occurs in other types of mixers with the outlet located in the bottom part during mixing. In addition, also with very dry concretes (class S1 ? slump 2/3) the effect of overturning the material warrants the quality of the mix.

www.oru.it