METHOD OF PLASTIC MOULDING OF CERAMIC STONES IN STREW VACUUM PRESS WITH ELECTRIC DRIVEFIELD Russian patent published in 2015 - IPC B28B3/22 B28B13/00 

FIELD: construction.

SUBSTANCE: method of plastic moulding of structural clay tiles in screw vacuum press with electric drive comprises loading of ceramic mass in press, determination of moisture, moulding of raw belt of structural clay tiles as a result of movement of ceramic mass inside the press and inside the moulded link under the action of rotating screw and cutting of the moulded raw belt of structural clay tiles. Limitations imposed by rheological parameters of ceramic mass, technological features and technical specifications of screw press, on maximum and minimum allowable values of humidity of ceramic mass, velocity of shear deformations of ceramic mass at outlet of moulding link and vacuum depth in the vacuum chamber of screw press, are specified additionally. Value of flow index and vacuum depth in the vacuum chamber of screw press is determined. Functional dependence of velocity value of shear deformations at outlet of moulding link from the designed strength of structural clay tile, vacuum humidity and depth is determined in the context of specified limitations. Dependence of rotation speed of the screw from the velocity value of shear deformations at output of moulding link and flow index of ceramic mass is determined. The required value of strength of structural clay tile is specified, required value of the velocity of shear deformations is calculated, required value of rotation velocity of screw is calculated. The current value of rotation speed of screw is measured. The required value of rotation speed of screw with the current value is compared. As a result, difference signal, which is supplied to the input of speed regulator of electric drive of screw press, is obtained. The output signal of regulator is supplied to input of the power converter of electric drive of the screw press.

EFFECT: achievement of the required strength of structural clay tiles due to the automatic correction of rotation velocity of the screw when changing the physicochemical properties and degree of vacuum processing of ceramic mass.

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