Method for producing moulding sand and apparatus for carrying out said method (variant embodiments)

Abstract

The claimed inventions relate to foundry work. A metered quantity of components of a mixture is poured into a mixer, a calculated quantity of water is introduced and the components are mixed. The moisture content of the mixture is measured directly in the mixer after a representative sample is taken. The sample is taken with the aid of a unit for monitoring the moisture content of the mixture, the unit comprising a specimen-forming case fixed at an inclination on the wall of an immovable cup. The specimen is produced from the representative sample taken by means of compaction and the moisture content is measured with subsequent adjustment of the moisture content of the batch being monitored.

Description

technical field [0001] The present invention relates to the field of foundry, ie to techniques for preparing molding sand and controlling its properties, in particular humidity control during the preparation of molding sand. Background technique [0002] The method of preparing molding sand consists of weighing sand, bentonite and water in proportion, filling the sand components in a rotating mixing drum, where the sand is homogenized while cooling under vacuum, and its moisture level is measured The necessary water content to be added to a specific sand mixture can thus be accurately calculated (see magazine "CASTING Plant and Technology", 2009, pp. 5, 6). In the above method, the measurement of humidity can be carried out by inserting the probe into the molding sand and fixing the humidity detector at its end (see EIRICH company brochure, "Equipment for preparing mold-sand", page 9, July 2006 ,Germany). [0003] The disadvantage of this known method is that it can only b...

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Problems solved by technology

[0009] However, the evaluation of this parameter and the use of these known methods and devices for the continuous monitoring of the relative humidity of the molding sand mixture is also inaccurate, because the heterogeneity of the structure and the quality of the extracted samples cannot guarantee the accuracy of the detection results, when This is especially important when using techniques that combine sand preparation and cooling methods

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