Abrading – Machine – Sandblast
Patent
1996-07-12
1998-04-07
Eley, Timothy V.
Abrading
Machine
Sandblast
134109, 210420, B24C 900, B24C 3500, B08B 304
Patent
active
057357307
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a cleaning machine operating with granules including a pump for ejecting liquid optionally with or without granules heavier than the liquid, through nozzles against goods to be cleaned in a treatment space which is connected to the suction side of the pump via a bottom outlet having a granule valve associated therewith, said valve comprising a socket open at both ends, which is guided for vertical displacement between a position in which the lower end of the socket is raised from the bottom of the treatment space and the upper end of the socket is engaged with a stationary cap provided above the socket, to allow the pump to draw liquid with granules entrained therein from the treatment space at a lower level at the lower end of the socket, and a lower position wherein the lower end of the socket engages the bottom of the treatment space to allow the pump to draw liquid only from an upper level at the upper end of the socket, the granules being collected on the bottom of the treatment space.
The principle of allowing the pump to draw liquid from a lower level in the treatment space when the liquid shall contain granules, and from an upper level when liquid only shall be circulated through the treatment space, is disclosed in EP-B1-0 169 187 which discloses also an embodiment of the granule valve which is of the kind referred to above. It has been found that in a cleaning machine operating with granules, which has a granule valve of said embodiment, an unsatisfactory separation of the granules from the liquid may occur when liquid only is to be circulated through the treatment space due to the fact that heavy splashing is imparted to the liquid contained in the lower part of the treatment space, functioning as a liquid tank, when liquid under heavy pressure and in large quantity is ejected against the goods to be cleaned in the treatment space. By the movement of the liquid in the tank movement is imparted also to the granules resting on the bottom and then the granules can be withdrawn by the liquid drawn by the pump at the upper end of the socket, i.e. at the upper level.
EP-B1-0 195 959 describes a cleaning machine operating with granules having a granule valve which is also of the kind referred to above but wherein the risk of granules being withdrawn by the liquid to the pump when drawing from the upper level being eliminated by providing between the upper edge of the socket and the periphery of the cap a strainer, e.g. a filter cloth, which is so dense that no granules can pass therethrough. This is no satisfactory solution of the problem to prevent the granules from being withdrawn by the liquid when the pump is drawing from the upper level because the attachment of the strainer will be structurally complicated and the device requires extended service on the machine due to the fact that the strainer will easily be clogged by food rests and other contaminations in the liquid and, if said strainer comprises a filter cloth, has to be replaced from time to time.
In order to eliminate said disadvantages the cleaning machine operating with granules of the kind referred to above has obtained according to the invention the characterizing features of claim 1.
SUMMARY OF THE INVENTION
According to a preferred development of the invention it is proposed to provide over the bottom of the treatment space below the flange provided on the socket of the granule valve, a grid operating as a splash attenuator and having square apertures defined by vertical plates, said grid attenuating the movement of granules collected in the water in the lower part of the treatment space functioning as a liquid tank, where turbulence is imparted to the liquid by the liquid ejected from the nozzles.
BRIEF DESCRIPTION OF THE DRAWINGS
In order to explain the invention in more detail an illustrative embodiment thereof will be described closer below, reference being made to the accompanying drawings, wherein
FIG. 1 is a fragmentary vertical cross sectional view of the lower part
REFERENCES:
patent: 2621505 (1952-12-01), Smith
patent: 3640023 (1972-02-01), Field et al.
patent: 4184961 (1980-01-01), Rynde et al.
patent: 4653520 (1987-03-01), Alvemarker
patent: 4862914 (1989-09-01), Weingarten
patent: 5056275 (1991-10-01), Wada et al.
Jonemo Per
Lindqvist Rolf
Eley Timothy V.
GS Development AB
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