| 摘要 |
A drying and mixing plant for producing a bituminous paving mixture comprises a drying and mixing drum (10) which is supported by a hydraulic cylinder (16) or other lifting means so that the inclination of the drum axis may be altered. By choosing a suitably small angle of inclination so that the drum inclines downwardly towards its outlet end, the plant may be used for continuous operation, so-called drum-mixing. Aggregates and other components may then be supplied continuously to the inlet end of the drum from silos (18), through a center intake (24) from another source (25) and binder such as bitumen may be supplied through a supply tube (58). Finished paving mixture is continuously discharged from the outlet end of the drum and passed to a product silo (28) via a conveyor (27). Alternatively, if the drum axis is arranged substantially horizontally, it is possible to treat two or more substantially separate material portions of different compositions in the drum (10) at the same time in so-called batch-mixing. By tilting the drum (10) by means of the cylinders (16), the material portions may be transferred from one drum section to the next after a certain time of treatment, and finished paving mixture may be discharged as a total portion from the drum section adjacent to the outlet end of the drum. The discharged mixture portion may possibly be further treated or be mixed with further materials in a mixing apparatus (30), to which the mixture portion is passed by means of a conveyor (29). The same plant may thus optionally be used for continuous production of large amounts of a paving mixture of the same composition or for batch-wise production of small asphalt amounts of the different compositions. |
