Abrading – Machine – Sandblast
Patent
1994-10-24
1997-02-11
Rose, Robert A.
Abrading
Machine
Sandblast
451 89, B24C 304, B24C 900
Patent
active
056014805
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a cleaning machine for treating goods in accordance with the preamble of claim 1.
A prior art device for separating granules from the circulating liquid flow is described in EP-B-0 169 847. In the tank where the liquid is collected, the granules sink to the bottom, and when the liquid and the granules are to be brought to the nozzles, the liquid is drawn from a lower level adjacent to the bottom of the tank so that the granules are drawn with the liquid, and when only the liquid is to be brought to the nozzles, the liquid is taken from a higher level well above the layer of granules at the bottom of the tank so that said granules are not drawn with the liquid flow.
Another separating principle is described in SE-B-464 387. A collecting container defines two spaces of which one at the top communicates with the treating chamber while the other at the top is separated from the treating chamber, and between said spaces there is provided a bottom groove which communicates with a pump, and a partition which permits flow of liquid between the two spaces and which is pivotable about a vertical axis between two end positions for preventing passage of the granules to the bottom groove in one end position and permit such passage in the other end position.
One object of the invention is to provide a cleaning machine which permits shifting between liquid with granules and liquid without granules while treating goods located in the treating chamber.
Another object is to provide a cleaning machine of only stationary members for obtaining the highest possible wear resistance.
A further object is to be able to shift between cleaning with and without granules in a simple manner.
A still further object is to be able to carry out an additional treatment with granules, when required, independent of the cleaning program set.
According to the invention, for attaining said objects, a cleaning machine of the abovementioned type has received the characterizing features of claim 1.
The invention will be further described below with reference to the accompanying drawing, in which
FIG. 1 is a vertical sectional view of the lower portion of a cleaning machine according to the invention, showing the separated granules; and
FIG. 2 is a vertical sectional view of the collecting container with arrows showing the liquid flow while cleaning with liquid only.
The cleaning machine illustrated in the drawings comprises a collecting container 1 which is situated beneath a partially and schematically illustrated treating chamber 2 wherein goods to be cleaned are located. This treating chamber is accessible through an opening in the shape of a lid or door (not shown) in a conventional manner, and it has a suitable stand for carrying the goods in the chamber. Beneath the treating chamber 2 in the collecting container 1, there are provided, in the embodiment shown, two spaces 9, 18 of which one space 18 is closed and the other space 9 is open. The closed space 18 contains a pump device consisting of two pumps 3, 4 which are operated by motors 16 and 17 respectively. Alternatively, the pumps 3, 4 can each be located in a separate closed space, whereby said closed spaces can be provided e.g. in diametrically opposed positions in the collecting container or at opposite walls thereof. It is also possible to locate the pumps 3, 4 in a space outside the collecting container 1, on the outer side of the cleaning machine or even outside the cleaning machine on any suitable location for the purpose. In the embodiment shown however, with both pumps 3, 4 in a common closed space 18, delivery conduits 5, 6 extend from the pressure side of the pumps 3, 4 and are thereafter brought together to a common delivery conduit 7 which goes up into the treating chamber 2, whereby one or more ramps of nozzles 8 are connected with the delivery conduit 7. At the transition to the common delivery conduit 7, non return valves can be provided in each delivery conduit 5, 6. The pumps 3, 4 are preferably centrifugal pumps, whereby the capacity of t
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PW-System AB
Rose Robert A.
LandOfFree
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