Metal founding – With signal – indicator or inspection means
Patent
1996-04-05
1997-09-30
Batten, Jr., J. Reed
Metal founding
With signal, indicator or inspection means
1641557, 164201, B22C 1526, B22C 1904
Patent
active
056717989
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a device for filling shooting heads with molding materials, the device being provided with a filling assembly that comprises a storage hopper for the molding material, an outlet member for discharging the molding material into the shooting head, and a gate for closing the outlet member, the filling assembly being mounted on a machine frame for vertical movement so as to immerse the outlet member into the shooting head to be filled.
In the foundry practice, core shooting machines have been known for many years. For casting molded products, the foundry cores or molds are made in most cases as separate parts. They are combined and joined to each other to form a casting mold. An essential component of the core shooting machines are the so-called shooting heads with shooting plates accommodating the shooting nozzles. Molding sand, in particular core sand, i.e., a quartz sand previously compounded or coated with binding agents is supplied to the shooting heads under discussion, from which it is blown or shot under a very high air pressure into the respective molds through the nozzles arranged in the shooting plate.
DE 41 28 952 C1 discloses a known device for filling shooting heads with molding materials. However, this device is extremely problematic with respect to monitoring its filling level. The filling level of the known device, in particular in the region of the storage hopper is determined by means of measuring probes, which project from the outside into the storage hopper or terminate flush with the inside wall of the storage hopper, these measuring probes being provided at different heights for determining defined filling levels. However, on their measuring side, i.e., toward the interior of the storage hopper, these filling level probes have at least small steps or discontinuous transitions in their wall and, thus, form critical regions, to which the nonflowable or moist molding material may stick or adhere. In the course of several fillings, encrusted buildups form thereon, which are detected by the measuring probe as the filling level or the molding material. Consequently, the arrangement of the measuring probes under discussion involves a system-inherent imperfection to the extent that the measuring probe itself constitutes a cause for an erroneous measuring situation simulating a filling level as a result of material accumulations in the region of the measuring probe.
It is therefore the object of the present invention to improve and further develop a device for filling shooting heads of the kind under discussion, so that it is possible to determine with simple means the filling level of the storage hopper, or to exactly predetermine and even reproduce a filling of the filling assembly.
SUMMARY OF THE INVENTION
The device of the present invention for filling shooting heads achieves the foregoing object by the provision of a weighing device which is connected between the filling assembly and the machine frame, and so that the weighing device determines the weight of the entire filling assembly.
In accordance with the invention, the longstanding, proven method of determining the filling level by means of measuring probes has been discarded. Instead, it has been recognized that the filling level of the filling assembly or the storage hopper may be determined without adversely affecting the storage hopper, in that the entire filling assembly is weighed. Within the scope of a simplest configuration of the device in accordance of the invention, it would be possible to determine the net weight of the filling assembly before starting a first filling, and after determining accordingly the weight of the loaded filling assembly, the previously determined net weight would have to be deducted from the gross weight. With a known pouring density of the molding materials, the pouring volume could be calculated, if necessary, with the quantity of forming material required for shooting cores being easily definable by also indicating the weight.
Further, it wil
REFERENCES:
patent: 5078201 (1992-01-01), Nakamura
Landua Werner
Pichler Werner
Adolf Hottinger Maschinenbau GmbH
Batten, Jr. J. Reed
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