Batch mixers, mainly pan and open-top designs, with more stringent specifications on the mixing quality are used to prepare the mix at concrete plants. Continuous mixers, such as continuous drum or continuous open-top mixers, are not used in this field. Batch mixers used in precast plants mainly include pan mixers and open-top mixers.
Drum mixers have a rotary mixing chamber that moves about a horizontal or inclined axis. The mix is discharged by tilting or reversing the direction of rotation. The mixing effect is created by the free fall of the materials inside the rotating chamber and is intensified by mixing tools located within the chamber. Drum mixers have a limited range of applications in concrete plants.
Cone mixers are another type of batch mixer. They have a cone-shaped chamber that rotates about a vertical axis and is equipped with rotary mixing screws and paddles. The cone-shaped chamber is well-suited to working with differing flling levels.
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