It is an object of the invention, therefore, to provide at the connecting point between the grinding chamber and supporting frame an elastically deformable supporting ring which has on its inner and on its outer side, supporting members spaced from one another, whereby the supporting members of the outer side are arranged offset with respect to the supporting members of the inner side. This arrangement in accordance with the invention, has the advantage that by means of a simple securing of the supporting frames, an initial stress is applied to the elastic supporting device which is sufficiently great so that upon operation at the lowest possible temperature of -190 C which occurs, for example, when the grinding chambers of the mill are filled with liquid nitrogen, a residual stress of the supporting ring yielding inwardly remains. Thereby, the grinding chamber contraction is equalized under the influence of the liquid freezing mixture introduced into the grinding chamber at the most favorable point for such equalization, that is, directly above the surface of the sleeve of the grinding chamber. Thereby it is possible to construct the supporting frame securing device more easily and more simply.
Another object of the invention is to provide that at least part of the supporting device forming the supporting member consists of a heat-insulating material. This construction advantageously results in the elastic supporting ring not being cooled to the temperature of the grinding chamber, but instead maintaining a temperature which is relatively close to room temperature. For this reason, the elastic part may consist of normal materials which do not need to be temperature resistant. In spite of this, the desired low heat transfer to the outside to the supporting frames is insured.
Another object is to provide on the outer side of the elastically deformable supporting ring at least one annular supporting member and on the inner side at least two annularly supporting members. This arrangement of the supporting members insures that even with the smallest transverse dimension of the supporting device, a stable positioning of the device is assured without the danger of tilting.
Another object of the invention is to provide an elastically deformable supporting ring which preferably consists of metal and supporting members which preferably consist of synthetic material reinforced with fiber. In this way, in an advantageous manner, a functional distribution for the material is attained within the supporting device. Thus, the elastic characteristics of the metal are made use of just as are the heat-insulating characteristics of the synthetic material. A resilient element results which in its bracing effect and flexibility acts substantially better than a construction wherein the supporting frames are resilient elements. Thus, the changes in diameter of the grinding chamber are equalized in operation directly above its surface.
electrical compactor
consolidation apparatus
automatic pneumatic consolidometer
