RU1787681C - Apparatus for delivery of melt from pouring ladle - Google Patents

Abstract

SUMMARY OF THE INVENTION: a device comprising a sliding shutter, consisting of a movable and fixed cage, upper and lower refractory plates and a glass collector, a sealed bulk bin located on the side wall of the bucket and connected by a flexible hose to a movable cage of a sliding shutter, and a mechanism pneumatic supply of bulk materials, equipped with a control valve made in the form of a cylindrical metal sleeve, covering a truncated cylindrical liner and in contact with the liner truncated surface of the spring-loaded cylindrical sleeve adapted to be movable relative to the sleeve, wherein the sleeve is positioned on the movable valve cage, and spring-loaded sleeve is connected to a flexible hose. 4 ill.

Description

The invention relates to metallurgy, in particular to devices for casting steel, and can be used in the implementation of microalloying, modification and inoculation processes.

A known installation for introducing additives into the stream during casting, including a metering device mounted on a steel casting ladle body and connected to a material pipe made in the form of a pipe bent at an angle of 45 °.

The disadvantage of this installation is that because of the danger of clogging of the material pipeline by dispersed particles supplied to the jet, the angle of inclination of the pipe must be at least 45 °, and therefore it is necessary to increase the height of the bucket above the center during casting. And this leads to intensification

the process of secondary oxidation of the metal due to the growth of the contact surface of the jet with the atmosphere and, ultimately, to an increase in the waste of introduced additives. In addition, during operation of the installation, the spreader has to perform additional operations related to turning the material feed on and off while moving the bucket from one center to another.

The closest in technical essence to the proposed device is a shutter for discharging metal from the casting ladle, including a fixed, movable holder, refractory plates and a collector cup, connected by a hose to a sealed bulk hopper mounted on the side wall of the forks XI

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Xi

about

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sha, as well as a mechanism for pneumatic supply of bulk materials,

The disadvantages of this device include the fact that when it is used, it is not only necessary to perform additional operations to control the input process of dispersed particles, but also they cannot be uniformly supplied depending on the casting speed, as a result of which chemical inhomogeneity of the metal will develop in the cast ingots , negatively showing its service properties, and the efficiency of the device is significantly reduced, since the additional processing costs are not provided provide the required quality improvement.

The purpose of the invention is to simplify maintenance and increase work efficiency .. -

This goal is achieved in that the device for discharging metal from the casting ladle, including a shutter placed on its bottom, consisting of a fixed cage, a movable cage, refractory plates and a collector cup, a sealed bulk bin mounted on the side wall of the bucket and by means of a flexible hose connected to a movable holder of the shutter, as well as a mechanism for pneumatic supply of bulk materials, equipped with an adjustment valve made in the form of a metal sleeve mounted on a movable wallpaper e gate and female truncated cylindrical liner and contacting them with the surface of a truncated spring-loaded metal sleeve connected to the hose and having a possibility of translational movement relative to the sleeve.

. In FIG. 1 shows a General view of the device; in FIG. 2 - the position of the valve parts with the shutter closed; in FIG. 3 - position of the valve parts with the valve fully open; in FIG. 4 is a section AA in FIG. 2. The device includes a shutter located on the bottom of the casting bucket 1, and consisting of a fixed holder 2, a movable holder 3, an upper refractory plate 4, a lower refractory plate 5, a collector bowl 6. A sealed hopper 7 is installed on the side wall of the ladle filled with bulk material 8, for the metered supply of which is a mechanism mounted inside the hopper, consisting of a pneumatic motor 9, a perforated metal pipe 10 aligned therewith and a screw 11 connected to the shaft of the pneumatic motor. The air motor is equipped with a supply pipe 12 and an exhaust pipe 13 communicating with the inner volume of the hopper 7. The lower end of the perforated pipe 10 is connected to the control valve in a metal braid 14 in the form of a metal sleeve 15 mounted on a movable sleeve 3 of the shutter and covering a truncated cylindrical steel liner 16 and a metal sleeve 17 in contact with a truncated surface, provided with two guide pins 18 and connected by two springs 19 with a movable clip. The stiffness of these springs is sufficient to ensure tight contact between the truncated surfaces of the liner 16 and the sleeve 17 at an excessive working pressure of the gas in the network of the pneumatic feed mechanism of bulk material, and the working stroke of the springs is equal to the diameter of the filling channel of the shutter. Due to the presence of two tides 20 with channels on the sleeve body 15, in which the guide pins 18 of the sleeve 17 are located, the latter has the possibility of translational movement relative to the sleeve 15. In the lower part of this sleeve there is an opening in communication with the guide channel 21 made in a movable holder 3, and on a fixed holder 2, two latches 22 are fixed, remote from the base of the guide pins 18 of the sleeve 17 by a distance equal to (where L is the stroke of the lower refractory plate 5, d is the diameter of the filling channel of the shutter).

The device operates as follows. Just before the metal is discharged into the casting bucket 1, the hopper 7 is filled with bulk material. Depending on the type of processing, these can be modifiers, alloying additives, etc. The loaded hopper is hermetically closed with a special cover, the lower end of the hose 14 is connected to the liner end of the sleeve 17 and the shutter is turned to the closed position, and its channel is filled with refractory powder 23. In this case (Fig. 2), the sleeve 17 is pressed tightly against the truncated cylindrical liner by springs 19 16 and closes the hole in the wall of the sleeve 15 in communication with the guide channel 21.

After receiving the metal, the bucket is fed to the casting platform, where a gas supply hose (not shown conventionally) is connected to the pipe 12 and an inert gas is supplied to the air motor 9 under excessive pressure. Since the exhaust pipe 13 communicates with the cavity of the hermetically sealed

hopper 7, and the stiffness of the springs 19 is sufficient to ensure tight contact between the truncated surfaces of the liner 16 and the sleeve 17 at the working gas pressure, the start of the air motor 9 will not occur.

When the shutter is opened, the sleeve 17 moves freely with the casing 3 and the sleeve 15 relative to the stationary casing 2 until the base of the guide pins 18 rests on the latches 22. This will happen when the gap between the edges of the holes of the refractory plates 4 and 5 appears since the distance between the base of the guide pins 18 of the sleeve 17 and the latches 22 is Ld where L is the stroke of the lower refractory plate 5, d is the diameter of the filling channel of the shutter). With further movement of the movable cage 3 until the holes of the refractory plates 4 and 5 are completely aligned, the sleeve 17 will be held in place by the clips 22, and the sleeve 15 will move together with the cage 3 associated with the springs 19, which will begin to stretch. Due to the presence of two tides 20 on the sleeve body 15 and the guide pins 18, the relative movement of the sleeve 15 and the sleeve. 17 will be progressive, as a result of which an opening will occur in the wall of the sleeve 15, and gas under pressure in the cavity of the hopper 7 will begin to flow through the hose 14 through the channel 21 into the area of space surrounding the open section of the expiring jet 24. Moreover, inert gas Before entering the cavity of the hopper 7, it passes through the working chamber of the air motor 9, driving its shaft, connected to the screw 11, to rotate. The screw 11, rotating inside the perforated pipe 10, performs a metered supply of bulk material 8 into the channel of the hose 14. Cha a particle material an inert gas flow are picked up and carried by the centerline 25 into the funnel where they are mixed with the flow of liquid steel and further along the runner system fall into molds.

At the end of the liquid metal filling of the molds of one pan, the shutter is closed. When the cage 3 moves in the opposite direction, the sleeve 17 is pressed by the springs 19 to the insert 16, as a result of which the channel 21 is closed and the air motor 9 stops.

Due to the fact that the device is equipped with a control valve, a relationship is ensured between the degree of its opening and the degree of opening of the shutter filling channel, as a result of which the volumetric flow rate of gas passing through the working chamber of the air motor and falling into the near-jet space, and with it the amount of granular feed material, depending on the frequency of rotation of the screw of the metering device,

will be proportional to the mass flow rate of the steel flowing from the casting bucket. Thus, automatic control of the flow of bulk reagents during casting is achieved, which contributes to

uniform mastering of the introduced ligatures, as a result of which the quality of the metal is increased, and ultimately the efficiency of the device, since it allows more efficient use of expensive modifiers and alloying additives. In addition, during operation of the device, there is no need to perform additional operations related to regulating the rotational speed of the shaft of the metering device drive motor, as well as turning it on and off. Thus, the claimed features can improve work efficiency and simplify maintenance.

devices for discharging metal from the casting ladle.

The economic effect of the use of the proposed invention for the conditions of Makeevka metallurgical

plant, in the open-hearth workshop of which it is planned to introduce it, can be calculated by the formula

35

E A RT St

100

A is the volume of steel cast with an additive

titanium-containing materials, A 150,000 t;

RT - consumption of ferrotitanium per ton of cast steel,, 9 kg / t;

St - the cost of a ton of ferrotitanium; Y is the percentage reduction in the loss of ferrotitanium when using the inventive device, Y 10%.

Claims (1)

The claims A device for discharging metal from a pouring ladle, comprising a sliding shutter, consisting of a fixed and movable holder, upper and lower refractory plates and a collector cup, a sealed hopper for introducing bulk additives, placed on the side wall of the ladle and connected by a flexible hose to a movable clip of a sliding shutter, and a mechanism for the pneumatic supply of bulk materials, characterized in that, in order to simplify maintenance and increase reliability, it is equipped with an adjustment valve installed on the metering hopper ohm formed in a cylindrical metal sleeve placed concentrically to it and a truncated cylindrical liner, and the liner contacting with the truncated with a sleeve made with the possibility of movement relative to the sleeve, the metal sleeve being placed on the movable sleeve of the shutter, and the spring surface of the spring-loaded cylinder 5 connected to the flexible hose. with a sleeve made with the possibility of movement relative to the sleeve, the metal sleeve being placed on the movable clip of the shutter, and Figure 2 16 I 1/3 &