Liquid purification or separation – Filter – Movable medium
Utility Patent
1997-10-14
2001-01-02
Reifsnyder, David A. (Department: 1723)
Liquid purification or separation
Filter
Movable medium
C210S380100, C494S040000, C494S047000, C494S048000, C360S234800, C360S234000, C118S052000, C118S418000
Utility Patent
active
06168715
ABSTRACT:
The invention concerns a device for the oil treatment of sintered parts consisting of a drum which is mounted so that it can rotate about a vertical axis and which can be driven. It has a drum mantle and loading and unloading devices so that it can be loaded and unloaded axially, a floor that tightly closes the opening in the floor, connections leading into the drum for liquid and gaseous treatment media for carrying out the treatment phases, and outlets for letting treatment fluids out of the drum.
One of the types of treatment is based on immersing porous parts, or parts containing porous layers, such as sintered parts, in order to improve their sliding behavior. An impregnation process is already known from JP 07252505 A; for holding the parts, this invention uses a perforated rotating inner drum which can be driven and which displays a vertical axis mounted in a stationary, full-walled external drum. The loading and unloading opening is located at the top and can be sufficiently tightly sealed to withstand pressure by means of the lid that can be placed on the outer drum. Connections are attached to the outer drum to evacuate the drum and fill it with air, and to feed immersion and washing liquids in and let them out. As the outer drum has to have sufficient radial distance between itself and the inner drum in order to permit the inner drum to swivel outwards while it is rotating, the holding capacity of the outer drum has to be sufficient to take the relevant quantity of immersion and washing fluid for treating the sintered parts in the inner drum. Accordingly, the times taken for evacuation, filling with air, and pumping impregnation and washing liquids in and out are that much longer, so that the treatment cycle requires a considerable amount of time and treatment fluid in total, and this all entails costs. Admittedly, it is possible to load by pouring liquids into the inner drum, but unloading either entails taking out the inner drum with the aid of lifting equipment and tipping it out, or else the parts have to be lifted out, by hand if necessary, and this means an additional expenditure of time and money. In particular, this unloading process interrupts the flow of treatment of the sintered parts, so that an impregnation device of this kind cannot be inserted into an automatic processing line for sintered parts.
Another device is known from WO 82/03 030 A1 for impregnating porous parts in which three top-shaped covers which can be moved along a vertical axis but not rotated can be lowered onto moving parts placed on a suitable conveyor into three different treatment positions, with the inside of the lid being closed tightly enough to withstand pressure in the first position. This can be evacuated, ventilated, and filled with or emptied of impregnation liquid. In the second position the parts can be spun, and washed and if necessary dried in the third position. This device is only suitable for a few parts at a time, because there is no filling basket available. The connections for evacuating the container, filling it with air, and for filling and emptying are fixed to non-rotating parts. This already familiar device, again, is not only expensive but also cannot be used in an automatic treatment line because it has no automatic loading or unloading facility. Finally, it is not possible to guarantee a constant level of quality because the parts are impregnated and washed when the device is standing still.
Yet another impregnating device is familiar from WO 81/02 699 A1 in which a bell is placed over the tank containing the parts to be impregnated and sealed in such a way as to withstand pressure. Evacuating the bell causes the impregnation liquid to be drawn into it. The seal between the bell and the tank is created by a double seal fitted to a flange on both sides, from which one seal is released when the bell is raised. The double seal has no effect on the emptying or loading of the bell. This device is likewise not suitable for inclusion in a continuous-process plant, because after the washing process, which takes place in a separate washing tunnel, there has to be a dripping and drying phase and this would represent an unacceptable delay to the treatment process.
Another part of oil treatment is removing the grease from parts completely covered in oil. A device for this purpose is known from DE 41 00 414 C1 for degreasing mass-produced parts such as bearing sleeves, in which the parts are placed in a drum with a perforated drum wall and then spun, with the oil thus expelled being retrieved and immediately re-used. The drum is open in its short wall for loading, and the floor can be raised for unloading. Only one spinning cycle takes place, and immersion beforehand is not possible.
The task of the present invention is therefore to create a device for the oil treatment of sintered or similar parts which not only mechanizes the treatment process but also can be repeated many times, always in the same way, so that a treatment process emerges for producing a uniformly oil-treated product.
The invention solves this problem by arranging the connections axially in the loading opening and leading the outlets through the drum mantle.
The advantages achieved by this invention consist mainly in the fact that there is now only one single closed device for the whole process of oil treatment, which even includes the washing and preserving cycles that follow, working practically in one continuous process without any manual work or separate devices being necessary for any of the individual working steps. This not only does away with baskets for transporting the sintered parts but also makes the time-consuming dripped time superfluous. The immersion oil does not become contaminated, so the immersion oil expelled by spinning can be re-used immediately. The unpleasant odor that has arisen so frequently in the past is greatly reduced. In the same way, the danger of floor contamination is eliminated and the oil treatment of sintered parts goes more quickly and precisely following this invention. It is easier for a person to operate than previous devices, and in addition to this permits the environmentally friendly production of sintered parts with lower oil consumption.
Further characteristics of the invention form the substance of the subordinate claims.
REFERENCES:
patent: 4100414 (1992-04-01), None
patent: 0 172 304 (1982-09-01), None
patent: 7252505 (1995-10-01), None
patent: 8102699 (1981-10-01), None
patent: 82/03030 (1982-09-01), None
Kasper Horst M.
Reifsnyder David A.
Turbo-Clean GmbH
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