-RUSSIAN

        The main direction of steelwork development in contenyvrary conditions is the progressive technologies and new equipment elaboration, which knovides the increasing of metal production quality. The particular role refers to the final stages of getting cast pig and ingot of outside furnace treatment and steel cast, connected with each other. The mentioned interconnection is stipulated not only by means of common tasks solving, perhaps increasing of arrangement efficiency in their complex applying as much as the positive results achieving during outside furnace treatment can be lost while further casting if appropriated conditions are not provided. The necessity of technologies development of outside furnace treatment and steel casting needs wide theoretical and experiment researches realigning, Aimed to the physical and mathematical patterns elaborating of learning operations, which provide their advanced practical applying. On this connection it was set the task by me to work out a new version of the dosing device, which could meet new needs, dictated by means of progressive technologies introduction.

         The purpose is to fulfill the research work and to create algorithm for calculation of vertical dosing devices, which design needs to work out independently, taking into account merits and deficiency of existing dosimeters. Tasks:

1. Theoretical research of factors, influencing on the equability of dosing materials distribution.
2. Practical research of factors, influencing on the equality of dosing materials distributing.
3. Elaborating and demonstrating accuracy of algorithms for account of the resistance moment while dosing device operation.
4. Researching of equability dependence of distributing material on:
   -Clearance dimensions of the operating parts;
   -Revolving frequencies of operating parts;
   -Distributing material parameters.
5. Model of work operating and elaboration of design documentation.

        Considerable contribution into the learning of technology of steel treatment outside the furnace were made by: Yeronko S.P., Oshovskaya E.V., Ameling D., Bolshakov V.D., Klimov B.D. Golubtsov V.A., Mizin V.G., Kadarmetov A.N., Smirnov A.N., Kukuy D.P., Machikin V.D. and others.

        The normal process of melt metal treatment by means of slag forming mixtures depends on stability dosimeter operation. The main demand the dosimeter has to meet while steel treatment with easy evaporating reagents is the high accuracy and equability of dosage. As the metal overheating concerning the boiling temperature of reagents always high enough, the reagents are evaporated at a moment, even insignificant vacillations of dosimeter production lead to the irregularity of reagents evaporating and hence possible metal discarding out of the dipper.

         The most simple of dosimeters as for design is pneumatic (figure 1,a) is consists of a bunker 3 with calibrating insert 4 below, adjusting the conveying pipeline 1. Pressure hollow and conveying pipeline needed for providing given dosimeter productivity, is supported by means of pressure regulator 2. Material expense is regulated by section changing of the hole in calibrating insert and pressure changing:

         Were ε is the coefficient of sprout compression; F₀– the area of the whole section, m2; Uист – sprout speed in the place of material outflow m/s; ρ_н – sprout density of material in the sprout, kg/m3

        Having imagined outflow of fragmetatid material as liquid in the first a proximally with density ρ, equal to strew density of material ρ_н, you can define the outflow speed due to the formula:

        Were φ; – speed coefficient; Δρ_б – pressure change is the bunker and in the outfit of the hole

        Having inserted the meaning of speed and section area of the hole, we’ll get:

        Were μ_отв = εφ– coefficient of expense considering the hole shape and the nature of dosing material; d_отв– the hole diameter in the calibrated insert .

        Thus pneumatic dosimeter productivity depends on the value of pressure change Δρ_б and the whole diameter d_отв which as a whole complicates significantly regulating and maintaining of given productivity during the operation period.

        On the figure 1. b we can see the ruled dosimeter, which consist of the bunkers 3, reel 5, revolving from the power engine and conveying pipeline 1. Fine fractioned material in the bunker, under the gravitation is filling reel’s slits while turning the pneumatic main line is given by portions. The main achievement of the reel dosimeter is the hard nature. The pressure change between the bunker and conveying pipeline and fractional material doesn’t influence the dosimeter productivity at all; the productivity is determined by means of the reel revolting and can be due to:

        Were ψ₀ = 0,8...0,9 – coefficient of reel slit filling; v_щ – volume of one slit, m3; i – number of reel slits; w_б – angle speed of reel revolving 1/s.

        The efficient lack of the reel dosimeter is discrete in reagent output from the bunker, which leads to disproportionate evaporating in metal, when the length of conveying line is small. More equal reagent output into the conveying pipeline, when the drive power is significantly less, is achieved by means of the screw dosimeter using (figure 1, c) which consists of the bunker 3, conveying screw 6, connected with power engine, gas pipeline 1 and leveling pipeline 7. Productivity of such a dosimeter can be calculated due to:

        Were ψ_в – coefficient of cross section dosimeter filling; ω_в – angle screw speed, 1/s; d_H – screw diameter, m; d_в – arbor diameter, m; S_B – screw step, m; z – number of screw coming, b – wind width, m.

        While wind dosimeter operation in the desulphurization conditions and the cast iron modification with the help of granulated magnesium we can watch disproportion of magnesium output , repeated at every screw revolve. The disproportion range determined as the absolute deviation ratio of immediate productivity from average to the average productivity, meaning to a great extent depends on the screw revolving frequency and a number of its worms. For cast iron treatment outside of furnace with granulated magnesium the sufficient extent of proportion while using of two – and one worm screws with angle screw speed 5.2-15.6 and 7.8-20.8 1/s according to (revolving frequency 50-150 and 75-200 r/min)Dosimeter productivity 0.05-0.3 kg/s is provided with the screw diameter of 0.055-0.07 m. Granulated magnesium coefficient ψ_в equals 0.91 while Z=1 and 0.52 while Z=2.

        Screw dosimeter greater extent than reel are sensible to the pressure change between the bunker and conveying pipeline, so the dosimeter has to be equipped with pressure evening by pipeline for keeping the stabile nature.

        In Donetsk polytechnical institute the spiral dosimeter design was elaborated for metal treatment outside furnace. The vertical spiral dosimeter (figure 1, d) consists of the bunker 3, when the tube introduced 8 – the dosimeter case. The dosimeter operating part is made as a wire spiral 9, straight connected with power engine 10. The main achievement of such a dosimeter is the great extent of proportion while material output from the bunker and design simplicity. It is achieved as a result of the high frequency of revolving spiral, the reductor absence, intermediate supports, extremely little (0.1-0.8 kWt) volume of the power engine. The productivity of spiral dosimeter: