RU2639109C2 - Method for preparing metallurgical ladle - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: steel-tapping channel (2) of the metallurgical ladle (1) is inspected, cleaned and containers (5) with starting mixture from are introduced from the bottom of the gate valve side. On the first container (5) a protective hose (6) is preliminary put, on the lower end of which a circular screen is fixed (7), and it is pushed together with protective hose into steel-tapping channel by subsequent containers (5) before the stop of the circular screen (7) into the end face surface of gate valve collector cup (3). The first container (5) is destroyed at the outlet from the protective hose to fill the steel-tapping channel with the starting mixture. The subsequent containers (5) are destroyed at the outlet from the starting mixture in the steel-tapping channel. After filling the steel-tapping channel with the starting mixture, the lower end of the last container (5) is fixed by the pusher in the lower plate channel of the gate valve, said channel is closed with gate valve plates by cutting the lower part of the protective hose, and the pusher is brought together with the residues of the protective hose.

EFFECT: reducing the temperature losses of the ladle lining at reduced consumption of the starting mixture ensures a shorter preparation time for the ladle.

2 cl, 3 dwg

Description

The present invention relates to metallurgy, in particular to steelmaking, and can be used to fill the starting mixture (bulk material) of the steel outlet of the steel pouring ladle in preparation for the next casting of liquid metal.

A device for filling a steel outlet of a steel pouring ladle with a starting mixture according to patent RU No. 2100143, class. V22D 41/08, by means of which a pipe is introduced into the steel pouring ladle from above.

The bottom end of the pipe is fixed in the area of the steel outlet channel.

A dosed feed of the starting mixture to fill the steel outlet channel is made through the central passage of the pipe, after which the pipe is taken out of the bucket.

The disadvantage of this device is the significant time spent on positioning the steel pouring ladle, as well as equipment for filling the starting mixture, and high operating costs. The closest to the proposed technical solution for the technical nature and the achieved result (prototype), according to the authors, is a method of preparing a metallurgical ladle according to patent RU No. 2569198, class. V22D 41/44, including installing the steel pouring ladle in a vertical position, mounting the guide sleeve of the slide gate of the manifold of the manifold of the collector glass, introducing the pipe into the steel outlet through the opening of the guide sleeve, supplying the starting mixture (pre-packed in sealed containers) through the central passage opening of the pipe from bottom to top with the destruction of the upper part of the container when it leaves the pipe and filling the cavity of the steel outlet channel with the starting mixture along the perimeter of the pipe, dismantling the pipe from the channel a, while the starting mixture is held in the channel as the pipe is removed.

A disadvantage of the known technical solution is the considerable time required for performing a number of technological operations when filling the ladle’s steel outlet channel with the starting mixture: mounting the guide sleeve, introducing the pipe into the steel outlet channel through the holes of the guide sleeve until its end protrudes above the surface of the ladle bottom, dismantling the pipe from the steel outlet channel, while the starting mixture is kept in the channel, as the pipe is removed, with a special device.

High operating costs for the maintenance of special devices: guide sleeve, pipe, pusher, holding pusher, valve. Increased consumption of the starting mixture (the presence of spills).

The task, the implementation of which the technical solution is directed, is to reduce the time for preparing the ladle for receiving heat.

In this case, obtaining such a technical result as reducing temperature losses by lining the steel pouring ladle, reducing the cost of the starting mixture and reducing operating costs is achieved.

The above disadvantages are eliminated by the fact that in the method of preparing a metallurgical ladle, including installing the ladle in an upright position, inspecting the steel outlet of the ladle with its subsequent cleaning, mounting the guide sleeve on the end face of the manifold glass, introducing the pipe into the steel outlet through the holes of the guide sleeve until it protrudes its end above the surface of the bottom of the bucket, the supply of the starting mixture (pre-packaged in airtight containers) through the central passage bore below, followed by destruction of the upper part of the container upon exiting the pipe and filling the cavity of the steel outlet channel with the starting mixture along the perimeter of the pipe, dismantling the pipe from the channel, while the container with the starting mixture is kept in the channel as the pipe is removed from it, bottom from the gate a shutter into the steel outlet channel is introduced a container with a starting mixture (hereinafter referred to as “container”), on the upper part of which a protective sleeve is previously put on, while the lower end of the protective sleeve is equipped with an annular screen, when the container and the protective sleeve are fed up, the annular screen abuts against the end of the collector cup, preventing further movement of the protective sleeve in the steel outlet of the bucket, the container continues to flow, when the protective sleeve exits the container, the container is destroyed and the steel outlet is filled with the starting mixture, then the containers are fed through the protective the sleeve is driven alternately, the previous container is pushed out subsequent with the destruction of the container when leaving the starting mixture as the steel outlet is filled of the first channel, after filling the steel outlet channel with the starting mixture, the lower end of the next (last) container is fixed in the channel of the lower plate of the slide gate with the pusher, the channel is blocked by plates that cut the lower part of the protective sleeve, then the pusher is removed from the channel along with the remains of the protective sleeve, the steel pouring ladle is ready to receive the next heat.

A comparative analysis of the proposed technical solution with the prototype shows that the claimed technical solution differs from the known method of supplying the starting mixture to the steel outlet of the metallurgical ladle. Thus, the claimed technical solution meets the criteria of the invention of "Novelty."

Since the present invention can be used in the metallurgical industry, and the testing of a prototype has already shown positive results, therefore, this technical solution meets the criteria of the invention "Industrial applicability".

A comparative analysis of the proposed technical solution not only with the prototype, but also with other technical solutions, did not allow us to identify the essential features inherent in the claimed solution. It follows that the claimed combination of significant differences allows to obtain the above technical result, which, according to the authors, meets the criteria of the invention "Inventive step".

The proposed technical solution will be clear from the following description and the accompanying drawings.

Figure 1 schematically shows a fragment of the input into the steel outlet channel of the bucket of the container and the protective sleeve.

Figure 2 schematically shows a fragment of the filling of the steel outlet channel with the starting mixture when feeding containers through a protective sleeve.

Figure 3 schematically shows a fragment of the filling of the steel outlet channel with the starting mixture while holding the last container in the bucket channel at the time of blocking the channel with the slide gate plates.

Metallurgical (steel pouring) bucket 1 is installed in a vertical position. Then, they inspect the steel outlet channel 2 of the bucket 1 with its subsequent cleaning. From the bottom, from the side of the slide gate, a container 5 is introduced into the steel outlet channel 2 of the bucket 1, on the upper part of which a protective sleeve 6 is previously put on, while the lower end of the protective sleeve 6 is equipped with an annular screen 7.

When feeding the container 5 and the protective sleeve 6 upward, the annular screen 7 abuts against the end of the cup of the collector 3, preventing the further movement of the protective sleeve 6 in the steel outlet channel 2 of the bucket 1.

The supply of the container 5 is continued, when the protective sleeve 6 exits, the container 5 is destroyed and the steel outlet channel 2 is filled with the starting mixture 9.

The destruction of the upper part of the container 5 occurs due to the impact on the packaging material of thermal radiation from the lining of the bucket 1 (temperature 850-950 ° C).

Subsequently, the supply of containers through the protective sleeve 6 is carried out alternately, the previous container 5 is pushed out by the subsequent container 8 with the destruction of the container 5 when leaving the starting mixture 9 as the steel outlet channel 2 is filled.

After filling the steel outlet channel 2 of the bucket 1 with the starting mixture 9, the lower end of the next (last) container 8 is fixed in the channel of the lower plate 4 of the slide gate with the pusher 10.

The steel outlet channel 2 is overlapped by the slide gate plates, which cut off the lower part of the protective sleeve 6. Then, the pusher 10 is removed from the steel outlet channel 2 together with the remains of the protective sleeve 6.

Metallurgical bucket 1 is ready to receive the next heat.

Example

At the ladle preparation site of the oxygen-converter shop, a metallurgical (steel-pouring) ladle with a capacity of 180 tons was installed in a vertical position. The temperature of the lining of the working layer was 850 ÷ 950 ° C.

Then, the steel outlet channel was inspected, followed by its cleaning. The diameter of the steel outlet channel was at least 69 mm.

A container with a starting mixture was introduced into the steel outlet channel from the side of the slide gate, the protective sleeve was previously put on the upper part of it, while its upper end protruded above the upper end of the container by no more than 10 mm (visually determined).

The lower end of the protective sleeve is equipped with an annular screen with an outer diameter of 110 mm.

The length of the protective sleeve was 600 mm with an outer 68 mm and an inner diameter of 67 mm.

The length of the container with the starting mixture was 1100 mm, the outer diameter was 66 mm.

When the container and protective sleeve were fed up, the annular screen abutted against the end of the collector glass.

The supply of the container through the protective sleeve was continued, followed by the destruction of its upper part upon exiting the sleeve and filling the steel outlet channel with the starting mixture, while the mixture fixed the protective sleeve in the channel.

Subsequently, the supply of containers through the protective sleeve was carried out alternately, the previous container was pushed out subsequent with the destruction of the container when leaving the starting mixture as the steel outlet channel was filled.

After filling the steel outlet channel with the starting mixture, the lower end of the next (last) container was fixed in the channel of the lower plate of the slide gate with the pusher. The channel was blocked by slide plates that cut off the lower part of the protective sleeve.

Then, a pusher was withdrawn from the steel outlet along with the remnants of the protective sleeve.

The metallurgical ladle is ready to receive the next heat.

Claims (2)

1. A method of preparing for casting a metallurgical ladle with a slide gate, comprising inspecting and cleaning the steel outlet channel and introducing into it containers with the starting mixture from below from the side of the slide gate, characterized in that a protective sleeve is previously put on the first container with the starting mixture, at the lower end of which the annular screen is fixed, it is introduced together with the protective sleeve into the steel outlet channel until the annular screen abuts against the end surface of the glass of the slide gate collector, the first contact is pushed out a trainer with a starting mixture from a protective sleeve followed by a container with a starting mixture with simultaneous destruction of the aforementioned container upon exiting the protective sleeve and filling the steel outlet with a starting mixture, the following containers with the starting mixture are pushed out alternately, the previous container being pushed out with the subsequent one with the same container being destroyed upon their exit from the starting mixture in the steel outlet, after filling the steel outlet with the starting mixture, the lower end along the last container is fixed in the channel of the lower plate of the slide gate with a pusher, the said channel is closed with the plates of the slide gate, cutting off the lower part of the protective sleeve, and the pusher is removed along with the remnants of the protective sleeve. 2. The method according to p. 1, characterized in that the length of the protective sleeve is 0.3-0.7 of the length of the steel outlet of the bucket.

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