| 摘要 |
<p>A planetary mixer comprises a cylindrical chamber (12) having greater length of diameter than axial height. A rotatable head (18) is mounted internally of the top (14) of the chamber (12). The head (18) carries at least one mixing paddle comprising a leg (22) and a paddle blade (24) to sweep across the bottom (16) of the chamber (12). The or each leg (22) is secured at its upper end at substantially right angles to a shaft (26). The shaft (26) being jounalled in two spaced brackets (28) secured to a base plate (30) of the head (18). The shaft (26) is rotatable in the brackets (28). A sleeve (32) is mounted on the shaft (26) between the two brackets (28) and having a first arm (34) extending outwardly therefrom substantially parallel to the plate (30). The first arm (34) has a shaft-rotation limiter (36) acting against the plate (30) and having a second arm (40) extending outwardly therefrom substantially parallel to the plate (30) in the opposite direction to the first arm (34). The second arm (40) is spring-biased to rotate the shaft (26) to cause the limiter (36) to abut the plate (30). The spring-biasing provides the respective leg (22) with a shock absorbency facility.</p> |
