| 摘要 |
Apparatus is disclosed for preparing a hot mix, comprising aggregate and bitumen, for repairing pot holes in roads. A vessel (16) is mounted, vertically disposed, on a vehicle (10) and comprises a mixing chamber (42) in which the aggregate and bitumen are mixed by a paddle assembly (50) mounted on a shaft (60) that rotates about a vertical axis. The shaft is mounted in bearing assemblies (not shown) located at the top and bottom of the mixing chamber. The shaft is able to slide vertically in the upper bearing assembly to cope with thermal expansion as the vessel is heated during the mixing, by virtue of a non-circular cross-sectional shaft sliding in axially fixed restraints. The vessel has a manhole (120) at its upper end (36) through which the aggregate and lumps of bitumen, at ambient temperature and hi solid form, can be loaded into the mixing chamber. The aggregate is loaded first and heated to expel moisture before the bitumen is loaded. The vessel can be tilted to discharge the hot mix through a second manhole (122) located adjacent the bottom of the mixing chamber. The paddle assembly sweeps out the space between the side and the inner part of the rotor, typically due to non-symmetrical placing of vertical plates.
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