Solid material comminution or disintegration – Apparatus – Rotary striking member with moving cooperating surface or...
Patent
1989-09-27
1991-04-23
Rosenbaum, Mark
Solid material comminution or disintegration
Apparatus
Rotary striking member with moving cooperating surface or...
241188R, 241197, B02C 1320
Patent
active
050093711
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a rotary disintegration apparatus of the type having a central material input and a material outlet that is open at the bottom, located in a housing.
The apparatus consists of an inner rotor secured to a shaft and an outer rotor on a shaft on the same axis which is driven in the opposite direction, and blade rings that follow each other in alternation, the blades of which, inclined in the direction of rotation, are provided with a protective coating and with blades having front and rear edges of hard, wear-resistant material installed, on the one side on retaining rings and on the other, on assembly rings, which are replaceable components of annular assembly ring carriers connected to the shafts.
In such a disintegration apparatus, for example as described in DE-AS 12 69 943, used to reduce hard material that is inclined to build up and cake, in particular sand, iron ore, and mixtures that contain these materials, the material is driven from the inside outwards by continuous impact on the blades. The blades are set at a specific inclination in the direction of rotation, towards the front and towards the outside. The preferred angle of inclination between the peripheral direction and the planes of the blades, measured on the front edge of the blade, is between 20 and 30.degree.. Optimal inclined dimensioning occurs with this blade inclination if, at the same time, the front and rear edges of the blades lie on the contour line of their retaining or assembly rings. These special features of the known disintegration apparatus are regarded not only as a prerequisite for good reduction work, but also for the fact that solid and durable protective layers of the material that is to be reduced form on the working surfaces of the blades, these layers being intended to protect the blades from rapid wear. Because of the formation of these protective layers, the impact effect takes place mainly on the surfaces of these protective layers.
If the blades with a smaller inclined dimension than corresponds to the width of the retaining or installation rings in the direction of the pitch angle of the blades are used, the reduction work that is done deteriorates to the point that even with twice the number of blades, one cannot achieve the advantages that can be achieved with blades that are not so wide. The accumulation of protective layers is significantly better with wider blades and the preferred pitch angle.
Even though these protective layers on the blades are of good quality and protect the blades from rapid wear, this known rotary disintegration apparatus does have some disadvantages.
As a result of the larger dimensions to the blades that are preferred for the formation of the protective layers, only very narrow deflection zones for the material that is to be reduced result between the blade rings that follow each other in alternation, and the result of this is the fact that the nominal speed range of the known rotary disintegration apparatus is relatively low. The reduction performance is limited by this fact. In addition, there is the special design construction of the known disintegration apparatus. The blades of the blade ring are, in each instance, secured to two parallel annular disks (retaining ring and assembly ring) which, in each instance, lie with the annular disks of the remaining blade rings in a plane that is perpendicular to the axis. The annular disks that are associated with the inner or the outer rotor, respectively, are joined to each other by spokes, preferably by a threaded connection. Although this is intended to make it easier to service the disintegrator--the blades can either be replaced or rotated through 180 in order to make use of the unused working surfaces--one must, however, accept flow-technology inadequacies in the relatively low working speed range within the disintegrator, by which the formation of spray grain is facilitated. It is also unfavourable, from the point of view of flow technology, that the projecting heads of the particular screws that ho
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patent: 3771734 (1973-11-01), Stephenson et al.
patent: 3894695 (1975-07-01), Benedikter
patent: 4406409 (1983-09-01), Durek
patent: 4747551 (1988-05-01), Shagarova et al.
Citadel Investments Limited
Rosenbaum Mark
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