Screw systems for supplying slag-forming mixture to the molds of continuous-casting machines

Abstract

The prospects for dosed supply of slag forming mixture to the molds of continuous casting machines are considered, and the need for further improvement of such systems is established-in particular, the use of a screw supply system. The parameters of flexible screws with internal diameter 15, 20, and 25 mm for transporting fine grain materials are studied experimentally; these screws are based on a steel helix (exter nal diameter 11, 16, and 18 mm; screw pitch 5, 10, 15, and 20 mm) rotating at 250-500 rpm. The output of the screw depends linearly on its speed of rotation, for the given geometric parameters. The ratio of the pitch S s to its external diameter d ex has considerable influence on screw performance. The dependence of the supply per screw turn on S s /d ex is nonlinear, with a maximum at S s /d ex = 0.9-1.1. The minimum unit energy of the screw system is observed at S s /d ex = 0.5-0.6. These results are used in the design of a new series of sys tems for dosed delivery of slag forming mixture to the molds of continuous casting machines with different cross sections.

Application of a Discrete Double-Row Scraper Cleaner as an Efficient Procedure of Cleaning of Belt Conveyors Aimed at Transporting Bulk Materials

“…It plays an important role because just its presence guarantees the possibility of double cleaning over the entire width of the belt. In the absence of the eccentric, only a single row of scrapers is pressed to the working surfaces of the belt [13][14][15].…”

“…The absence of proper maintenance and severe operating conditions lead to failures, deterioration of the quality of products, and, hence, financial losses [10][11][12][13][14][15][16][17][18][19][20]. The procedure of cleaning of conveyor belts is an important part of the entire production process.…”

Development of a Mathematical Model for a Workpiece Heating and Cooling in a Protective Medium while Treatment under Pressure

“…Once the temperature interval of processing is defined, they set the heating rate, the time for the ingot or billet to be held in the furnace for heating along the cross-section and length, and other heating mode parameters pursuant to special techniques in order to heat the metal uniformly throughout [16][17][18][19][20][21][22][23][24].…”