Abrading – Machine – Sandblast
Patent
1997-05-30
1998-06-23
Eley, Timothy V.
Abrading
Machine
Sandblast
451 96, 451 97, 451446, B24C 506, B24C 700
Patent
active
057696934
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an impeller wheel with radially extending blades which are connected to at least one lateral disc and whose inner ends are spaced at a distance to the center, further including an impeller cage with unloading openings arranged in the central area of the lateral disc which rotates together with the impeller wheel and in whose central area the blasting medium to be accelerated is introduced in the axial direction.
SUMMARY OF THE INVENTION
With devices furnished with such impeller wheels, which devices are, for example, known from German Offenlegungsschrift 25 38 228, surfaces of metallic rolled products are freed of scales and/or rust before a protective coating is applied to the surface, whereby against the surface a blasting medium is blasted which is comprised of fine metal particles. In such an impeller wheel all particles of the blasting medium, upon exiting the impeller wheel, move outwardly radially and substantially parallel to the blades. A considerable number of these particles impinges on the lateral discs and the blades and rebounds therefrom like a pingpong ball. This is not only negative with regard to the exit velocity of the blasting medium from the impeller wheel, but also results in a non-uniform distribution of the blasting medium on the surface to be cleaned. The impact of the blasting medium particles onto the parts of the impeller wheel results in considerable wear.
The impeller wheel according to the present invention is primarily characterized by: wherein a blasting material to be distributed with the impeller wheel is introduced in an axial feeding direction into a central area of the impeller cage; between the radial blades; from a center of the lateral disk and the guide blades having radially inner ends spaced at a second distance from the center of the lateral disk; auxiliary blades; free ends taper in a direction counter to the feeding direction of the blasting material. the vicinity of the free ends and widening in the feeding direction. face has ribs. wheel.
It is an object of the invention to reduce the wear of the impeller wheel resulting from the blasting medium and to simultaneously generate a blasting pattern having uniform coverage over the entire exit angle of the blasting medium from the impeller wheel and having approximately parallel lateral borders.
This object is inventively solved based on an impeller wheel of the aforementioned kind such that between the blades of the impeller wheel guide blades are arranged the inner ends of which have a greater distance to the center of the impeller wheel than those of the blades and the impeller cage is embodied as an auxiliary impeller wheel. The axial length of the blades of the auxiliary impeller wheel is greater than that of the blades of the impeller wheel by a considerable amount.
Due to the inventive embodiment of the impeller cage as an auxiliary impeller wheel the introduced blasting medium, before entering the impeller wheel, already moves on a circular path so that the blasting medium which exits the auxiliary impeller wheel, enters on a spiral circumferential path the impeller wheel so that the impact of blasting medium onto the blades of the impeller wheel is substantially prevented. For improving the spiral movement of the blasting medium along its path through the impeller wheel, the guide blades participate in that they catch stray blasting medium and channel it so that a uniform distribution of the blasting medium onto the surface to be treated is achieved. In a preferred embodiment of the invention the blades of the auxiliary impeller wheel taper in the direction of the inlet end so that, upon rotation of the impeller wheel, they form, in the direction of flow of the blasting medium, a conically tapering hollow space via which the blasting medium, for increasing the throughput, can optimally enter the blade area of the auxiliary impeller wheel. In this context it has been especially advantageous to arrange at the free ends of the blades of the auxiliary
REFERENCES:
patent: 2261185 (1941-11-01), Rosenberger
patent: 2363437 (1944-11-01), Peterson
patent: 2385728 (1945-09-01), Potter
patent: 2507166 (1950-05-01), Lehman
patent: 3872624 (1975-03-01), Ramaswamy
patent: 4759156 (1988-07-01), Baumgart
patent: 4941297 (1990-07-01), Carpenter
Banks Derris H.
Eley Timothy V.
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