As several experiments were performed on a horizontal single-shaft and a twin-shaft concrete mixer provided by Firma ELBA-Werk Maschinen GmbH. The volume of the single-shaft mixer according to Fig. 4 is V =60 L. The volume of the twin-shaft mixer according to Fig. 5 is V =120 L. The mixers have spiral mixing tools that move horizontally. It is characteristic of the twin-shaft mixer that the two mixing tools overlap in the middle part of mixing chamber. The mixing tools of the twin shaft mixer move in opposite directions towards each other. The product can be conveyed from the outer edge of the trough toward the interior or from the interior to the outer edge. In the single-shaft and twin-shaft mixer Portable concrete mixer, the wall-mounted mixing tool has a diameter of DW =550 mm. The length to diameter ratio between the drum diameter and the length is DT/L ≈1 for the single-shaft mixer and about 2DT/L ≈2 for the twin-shaft mixer. The filling ratios φ were φ≈50%. The rate per minute (rpm) for the single-shaft mixer n can be adjusted up to 75 rpm; for the twin-shaft mixer it is 49 rpm. A constant rpm of n =20 rpm is set for the performance of the mixing trials. In average mixing jobs, the mixing times are about tM ≈35 s according to.
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The mixing process can be observed or recorded continually if a video camera is positioned perpendicularly above the mixing chamber. The Sony VX2100E video camera employed here has a resolution of 720×576 pixels with an image rate of 30 images per second. A 1000 W Halogen lamp illuminates the mixing chamber in such a way that the formation of shadows by the mixing tool and the trough edge according to Fig. 6 is greatly reduced and the influence of outside light is minor. The loading of theconcrete mixers with the coarse aggregates, sand and cement etc. will be dosed over apurpose-built breadboard construction. The breadboard operates fully automatically.