Paddle mixer especially for building material mixtures containing swellable components

摘要

An inner wall contour of the trough of a paddle mixer can be changed to vary the distance between the paddle movement path and the trough inner wall. In a mixer with paddles attached to a mixer shaft which is rotatably mounted in a mixer trough, the trough is provided, on its inner wall, with an arrangement for changing the inner wall contour for varying the distance between the paddle movement path and the inner wall. Preferred Features: The contour changing arrangement may comprise adjustable flaps, one or more displaceable inner wall elements or one or more pressurizable chambers provided within an inner wall of rubber-like material.