UA73672C2 - Metal casting area - Google Patents

Abstract

The invention relates to the metallurgy and it can be used on the areas of continuous casting of steel. The area of metal casting includes a stand equipped with logs with steel teeming ladle located on them, and a bogie located on the position of pouring with a pony ladle having outlet openings in the bottom. The guides with driving frames mounted on them are fixed on the logs of stand, each of which is located with possibility of displacement along horizontal in the direction perpendicular with the longitudinal axis of intermediate ladle with the help of the drive fixed on the logs of stand. Proposed design of the area will ensure constant distance between the bottoms of steel teeming ladle and pony ladle, leaving the lower end of immersion pipe below the level of metal in the pony ladle.

Description

Description of the invention

The invention relates to metallurgical production and can be used in areas of continuous 2 pouring of steel, which comes in ladles from steel smelting units to obtain cast blanks of a given profile with different sizes.

A well-known site for pouring metal (according to Ukrainian patent 58862 A, B822011/10), consisting of a column fixed to the foundation, on which a rotary stand with lags for a steel ladle and a rotary trolley with traverses for a ladle are placed. Work in the area is carried out as follows. At the loading position, a steel ladle is installed on the logs 70 of the rotary stand. The stand rotation drive moves the steel ladle to the pouring position, where it is stopped above the heated ladle. Then they start pouring the metal from the steel ladle, and then through the pouring holes of the ladle - into the crystallizers. With a symmetrical placement of the pouring place (the fighting place) relative to the pairs of outlet holes of the ladle, the heat transfer of the metal relative to the pairs of outlet holes is also symmetrical. With this mode of casting on pairs of symmetrically located streams, there are 12 equivalent conditions (see Fig. 3). After the steel ladle is emptied, it is transferred to the reserve position by the rotation drive of the stand's logs, while at the same time a new steel ladle filled with metal is brought to the pouring position. At the same time | "Rules of technical operation of mechanical equipment of machines for continuous casting of blanks, M, Metallurgy, 1991, p.40, clause 4.2.5, prohibit pouring metal from a steel ladle into an intermediate ladle in the same place at two adjacent melts, so as not to break the metal with a jet , coming from the steel ladle, the impact plane made in the bottom of the ladle. To do this, the stand is turned from its initial position, changing the position of the steel ladle relative to the ladle by 1-2 g, which leads to asymmetry of the place of metal pouring in relation to the outlet holes of the ladle (see Fig. 4 ). At the same time, the distance in the ladle changes from the place where the metal jet falls to each of the outlet holes in the bottom. As a result, uneven heat transfer of the metal is created in relation to the different outlet holes of the ladle. c

From the moment the ladle is filled to the working level, the core of the metal with a higher temperature (He) is concentrated around the center of the metal filling.

The movement of the metal poured into the intermediate ladle from the place of pouring in the longitudinal directions of the ladle is associated with a change in its heat capacity in the areas of movement. In this regard, volumes of metal with a lower temperature are supplied to the more distant outlets, and metal with a higher temperature is supplied to the outlets located closer to the place of pouring. As a result, the volumes of metal flowing out of all outlets have different properties. This causes the instability of the casting process on different streams, the need to adjust the casting modes on each of the streams, often the tightening of outlets further away from the impact plane. And most importantly, it leads to a deterioration in the quality of metal blanks obtained using this equipment.

З The site of metal pouring is known, described in | Rules for the technical operation of mechanical equipment and machines for continuous casting of blanks", M, Metallurgy, 1991, p. 15-16).

The pouring area includes a lifting and rotating stand with a steel pouring ladle installed on its logs, two carts located to the left and right of the stand. "

Work in the area of metal pouring is carried out as follows. With a lifting crane, the Z7Z 70 promkivsh is installed on a cart located on one of the reserve positions and heated to a temperature of 1100-120020. c Then the cart with the heated ladle is moved to the pouring position, it is installed, centering it with respect to the crystallizers, and then metal is released from the steel ladle into the ladle. Then, through the outlet holes in the bottom of the ladle, the metal enters the crystallizers. After emptying the steel ladle by turning the stand, the empty steel ladle is transferred to the reserve position, simultaneously feeding the steel ladle filled with metal to the pouring position -1 75. Before the release of the next amount of metal from the steel ladle due to the lifting of the lags of the stand with the steel ladle, the position of the drain hole of the steel ladle is changed in relation to the impact plane (95) of the ladle, because, performing a plane-parallel movement, the steel ladle, rising vertically, would simultaneously move in the horizontal plane, while thus, the axis of the drain hole is shifted relative to the impact plane in the direction perpendicular to the longitudinal axis of the scoop. At the same time, the metal jet, falling 50° on the impact plane, is located symmetrically relative to the pairs of drain holes in the bottom of the ladle. This "leads to the stabilization of the casting process on pairs of symmetrically located outlet holes of the ladle and to the improvement of the quality of the metal blanks that are obtained.

In comparison with the analogue, in this part of the pouring there is an opportunity to shift the jet of metal coming out of the steel ladle relative to the bottom of the ladle in the direction that coincides with the transverse axis of the ladle, which allows to preserve the symmetry of the heat transfer of the metal within the pairs of outlet holes of the ladle, and this

HF) has a favorable effect on the quality of the metal. 7 However, when alloyed grades of steel are obtained, the metal is released from the steel ladle into the promkivsh, protecting the stream from oxidation by atmospheric oxygen. To do this, a submersible pipe is attached to the drain hole of the steel ladle with one end, while its other end must be located below the meniscus of the metal in the ladle for the entire period of metal outflow.

During the pouring of metal, there are possible situations in which there is a violation of the equality of the volumes of metal entering and leaving the ladle, for example, due to erosion of the drain hole of the steel ladle, tightening of individual discharge holes of the ladle, etc. To restore the normal mode of operation, the logs are moved from a steel ladle that moves in an arc. At the same time, the position of the drain hole of the steel ladle changes in relation to the outlet holes of the ladle, and the lengths of the metal streams from the impact plane to the outlet holes of the ladle change.

It becomes difficult to implement casting using a submersible pipe in the prototype and to perform pouring with the protection of the metal jet, because the movement of the axis of the pouring hole of the steel ladle in a direction perpendicular to the longitudinal axis of the ladle and coinciding with the transverse axis of the ladle takes place along a curvilinear path parallel to the plane and the submersible pipe, moving vertically, can rise above the level of the metal in the ladle. And this will lead to oxidation of the metal by atmospheric oxygen and deterioration of the quality of the obtained blanks.

Thus, the disadvantage of the prototype is the unsatisfactory quality of the workpieces received on the equipment of this 70 site.

The basis of the invention is the task of improving the quality of blanks obtained using the equipment of the metal casting site.

This task is solved due to the technical result, which consists in maintaining the constant distance between the bottoms of the steel ladle and the skimmer in height when moving the steel ladle in the direction perpendicular to the longitudinal axis of the skimmer and coinciding with its transverse axis.

In order to achieve the above-mentioned technical result in the area of pouring metal, which includes a stand equipped with logs with a steel ladle located on them, and a cart with a ladle with outlet holes in the bottom placed at the pouring position, in accordance with the invention, is equipped with guides fixed on the logs of the stand and installed on them by drive frames, each of which is placed with the possibility of moving 2o horizontally in the direction perpendicular to the longitudinal axis of the bucket from the drive fixed on the stand legs.

As a result of the comparative analysis of the site of pouring of the claimed metal and the prototype, it was established that they have the following general characteristics: - a stand equipped with logs, with a steel ladle located on them; c - a cart placed at the pouring position, carrying a funnel with outlet holes in the bottom; o and distinguishing features: - equipment with guides fixed on the stand's logs; - equipment with drive frames installed on the stand legs; - the possibility of moving each of the frames in a direction perpendicular to the longitudinal axis of the bucket and in a direction coinciding with its transverse axis; - fixing the frame drives on the stand's legs. -

Thus, the proposed site of metal pouring has new nodes and new connections between nodes, a new He mutual placement of elements relative to each other.

There is a cause and effect relationship between distinctive features and the technical result achieved. and)

Thanks to the equipment of the metal pouring area with guides fixed on the stand logs and drive frames mounted on them, each of which is placed with the possibility of moving horizontally in the direction perpendicular to the longitudinal axis of the ladle from the drive fixed on the stand logs, it became possible to move the steel ladle relative to the ladle in the direction perpendicular to the longitudinal axis of the ladle and coinciding with the transverse axis of the ladle, maintain a constant vertical distance between the bottoms of the steel ladle and the ladle, which allows pouring the metal with a jet protected from oxidation in atmospheric oxygen due to the placement of the free end of the immersion pipe below the level of the liquid of metal in a ladle, which ensures the receipt of high-quality metal blanks at the same time;" uniform composition of blanks on symmetrically located outlet holes.

Thus, the performance of the metal pouring section in accordance with the claims of the invention allows obtaining high-quality blanks. - And the exclusion of at least one of them from the distinguishing features does not provide a solution to the task - improving the quality of the received blanks. and The claimed technical solution is not known from the prior art and is therefore novel. b The claimed technical solution has an inventive level because the above-considered part of pouring 5p metal for a specialist does not follow from the state of the art. ш- The claimed solution is industrially applied because its technical implementation in the conditions, for example,

Ge JSC NKMZ presents no difficulties.

Using the proposed solution, a technical project was completed for the Moldavian Metallurgical Plant. 5B Thus, the proposed decision can be provided with legal protection because it is new, has an inventive level and is industrially applied. (F, The claimed technical solution is explained by the drawings, which show the following: ka Fig. 1 - general view of the metal pouring area;

Fig. 2 - view A in Fig. 1; in Fig. 3 - a plan view in an analogue with a symmetrical placement of the metal jet relative to the pairs of drain holes of the ladle;

Fig. 4 - a plan view in an analogue with asymmetric placement of the metal jet relative to pairs of drain holes of the ladle.

The composition of the metal pouring area includes a stand 1 with logs 2, on which a steel ladle Z with 65 Drain hole 4 in the bottom and a trolley 5 with an intermediate bucket 6 placed on it are installed. Guides 7, made in this case in the form of rollers, are fixed on the logs 2. on which the frames 8 are installed. In addition, horizontal movement drives 9 are installed on the lags 2, each of which is articulated with a corresponding frame 8. The type of movement drive is not of significant importance for this invention, and can be, for example, electromechanical or hydraulic. In this case, preference is given to the hydraulic drive, as it is simpler. An immersion pipe 10 is connected to the drain hole 4 to the bottom of the steel ladle C.

Work in the area of metal pouring is carried out as follows.

The intermediate ladle 6, heated at the reserve position, is delivered to the pouring position by trolley 5. Steel ladle Z filled with molten metal is installed with a lifting crane on frame 8 of stand 1. Steel ladle Z is placed above ladle 6 by turning lug 2. The gate valves of steel ladle C are opened and metal is discharged from steel ladle Z into ladle 6 through the 7/0 70 submersible pipe. adjust the mutual location of ladles C and 6 so that the stream of metal leaving the steel ladle 3 falls on the transverse axis of ladle 6. Then, through the outlet holes of ladle 6, the metal enters the crystallizers. At the same time, the symmetry of heat transfer of metal will be preserved between the symmetrically located outlet holes of the ladle, which allows obtaining metal blanks of the same composition and quality on them. In the event of an imbalance in the volume /5 of metal entering and leaving the ladle, for example, due to erosion of the drain hole of the steel ladle, tightening of individual discharge holes of the ladle 6, etc. to restore the normal mode of operation, the drive 9 moves the frame 8, which, moving along the guides 7, displaces the steel ladle Z horizontally in the direction that coincides with the transverse axis of the ladle 6. At the same time, the position of the drain hole of the steel ladle Z relative to the outlet holes of the ladle b changes and the lengths change metal flows from the impact plane to the outlet holes of the ladle, and the lower end of the immersion pipe 10, as before, is below the level of the metal in the ladle 6, that is, there is no oxidation of liquid metal by atmospheric oxygen.

After emptying the steel ladle by turning the stand 1, the empty steel ladle C is transferred to the reserve position, and the next steel ladle 3, filled with metal, installed on the frame 8, is placed in the pouring position above the promkovip 6. The drive 9 moves the frame 8 along the guides 7, exposing the steel ladle Z in this way, so that the stream of metal, which will come out of the submersible pipe 10, falling on the new place of the impact plane in the bottom of the prom bucket, is symmetrically located relative to the pairs of outlet holes located in it. Further work in the i) area of metal pouring is repeated in the same way as described.

From all of the above, it can be seen that the implementation of the metal pouring section in accordance with the claims of the invention allows you to move the steel ladle in the direction that coincides with the transverse axis of the ladle, relative to it along

From the horizontal during metal pouring, keeping a constant distance between the bottoms of the steel ladle and the ladle, leaving the lower end of the immersion pipe below the level of the metal in the ladle, which protects the stream of metal from oxidation by oxygen in the air and allows obtaining metal blanks of high quality and the same composition on the symmetrically located outlet holes of the dipper.

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Claims (1)

The formula of the invention;" " The metal pouring area, which includes a stand equipped with logs with a steel ladle located on them, and a trolley with a prom bucket with outlet holes in the bottom placed at the pouring position - 72 which is distinguished by the fact that it is equipped with guides fixed on the stand logs and installed on them by drive frames, each of which is placed with the possibility of moving horizontally in the direction, 9) perpendicular to the longitudinal axis of the bucket from the drive fixed on the stand legs. b Official bulletin "Industrial Property". Book 1 "Inventions, useful models, topographies of integral - And 20 microcircuits", 2005, M 8, 15.08.2005. State Department of Intellectual Property of the Ministry of Education and Science of Ukraine. Kz U r F) name) 60 b5