RU2025200C1 - Pouring basket for working metal in the process of continuous casting - Google Patents

Abstract

FIELD: metallurgy. SUBSTANCE: pouring basket has inlet branch pipe 3 build in hermetically sealed cover 2 of pouring basket. Inner cavity of pouring basket gap volume is divided by stream forming member 6 into barometric ferroseal section and discharge branch pipe zone section. Metal melt is fed through inlet branch pipe 3 to barometric ferroseal and, upon complete filling of it, overflows through stream forming member 6, from which thin film-like steams and small drips begin to flow in the process of flowing metal to hearth drips begin to flow in the branch pipes 8. Pouring basket is mounted on three hydraulic lifters 9, which provide displacement of pouring basket in horizontal plane to any position. Adjustment of metal feeding rate for vacuum working is effectuated by stop of pouring basket or by calibrated sleeve in case pouring of metal is conducted without stop. EFFECT: increased efficiency and wider operational capabilities. 2 dwg

Description

 The invention relates to continuous casting and vacuum processing of steel in a stream and can be used in the metallurgical industry at CCM.

 When casting steel at CCMs, intermediate ladles are used, mounted on hydraulic hoisting and turning tables. In each of them there are two locking devices through which steel is supplied and distributed through the molds.

 The structural drawback of these buckets is that they are unable to actively protect the stream and mirror of the metal volume from oxidation.

 This task is performed by the well-known technical solution [1], according to which the intermediate container is made in the form of a lined chamber provided with a protrusion in the zone of incidence of the metal stream, and holes for the release of metal are made in its bottom, and a rotating disk mounted on the hollow shaft is mounted on the protrusion , in the upper part of which holes for gas supply are made.

 This intermediate capacity is the closest to the proposed solution and adopted as a prototype.

 This solution provides protection of the metal jet from oxidation and its partial cooling with a protective gas. However, this solution does not provide for much-needed vacuum refining of steel in a stream; it does not have technical means for this.

 The aim of the invention is to increase the productivity of continuous caster and metal quality by increasing the degree of vacuum refining.

 Figure 1 shows the proposed intermediate bucket, a longitudinal section; figure 2 is a section aa in figure 1.

 An intermediate bucket consists of a container 1, a tightly closed lid 2, a receiving pipe 3, a locking device 4, a sealing bellows 5, a jet-forming element 6, made in the form of a partition mounted on the side walls of the container and the bottom, a drain channel 7, drain pipes 8, hydraulic lifts 9, crystallizers 10.

 Work of an intermediate ladle as a vacuum chamber.

 Before starting up the bucket, the lid 2 is sealed, and tin caps are put on the drain pipes 8, while the seeds in the molds are lifted to the stop with the bottoms of the caps.

 Simultaneously with a set of vacuum begin to fill the intermediate ladle with metal. As the bucket is filled with metal, a pause is made, which makes it possible to degass the first portions of the metal. Then continue filling the bucket until the upper full barometric ferro-lock is installed.

 With the release of the metal level at the mark of the upper edge of the jet-forming element 6, two side hydraulic lifts 9 begin to lower one of the sides of the bucket down, and the third hydraulic lift 9 raises the tail of the bucket up. In this case, the bucket at a pace tilts toward the drain pipes 8. The metal begins to overflow intensively through the jet-forming element 6 and in a short time fills the drain pipes 8.

 Filling the drain pipes with metal at a pace facilitates the rapid melting of the sealing caps, the establishment of full barometric ferro locks in the drain pipes, and the output of the tundish to operating mode.

 In the operating mode, the metal from the steel pouring ladle, which is regulated by the stopper on the casting ladle, constantly enters the inlet pipe 3, from which the required volume of metal is fed in the sector of the input gate. In this sector, the metal is partially degassed and deoxidized.

 When the metal level rises above the edge of the jet-forming element 6 and the optimum flow of metal into the bucket, it begins to overflow through the partition in the form of thin jets and drops. In the free fall of jets and drops to the bottom of the bucket, the metal undergoes active degassing, deoxidation and partial cooling.

 At the bottom of the sector of drain pipes 8, metal is distributed over each of the molds depending on the specific inclination of the bottom of the bucket. The flow of metal into the tundish is controlled by a stopper in the casting ladle. Fine control of the flow of metal through individual molds is carried out using three hydraulic lifts, on which an intermediate bucket is installed. All three hydraulic lifts are involved in a multi-faceted system of manual and automatic regulation, including the position of the intermediate bucket in the horizontal plane. The regulation of the three supports of the bucket allows you to feed metal into one of the molds, into both molds simultaneously with equal or different volumes of metal supply to each of them. In the bucket, you can create some reserve metal reserve due to a certain tilt of the bucket to its tail part and to expend a certain part of it if necessary. This allows casting "melting" without stopping caster.

 When stopping for repairs or in emergency cases, the metal from the ladle is drained as follows. So that when the bucket is released from the metal, the vacuum does not break off accidentally and all the metal has time to be degassed, the opening in the receiving pipe 3 is closed with a conical refractory stopper and sealed with a viscous refractory mass. In this case, the vacuum is maintained until all the metal has merged.

 After installing the sealing plug, the metal is drained as usual. When the metal level in the bucket drops to the mark, when it will no longer be possible to drain it by the action of hydraulic lifts, the metal is drained through the ladle locking device 4 at a speed that ensures complete metal evacuation.

 Thus, the initial and final parts of the non-evacuated metal are completely eliminated, pauses in casting are eliminated, complete degassing and deoxidation of the entire cast metal is ensured.

Claims (1)

 INTERMEDIATE BUCKET FOR PROCESSING METAL DURING CONTINUOUS CASTING, comprising a lined body and a lid sealed together, a jet-forming element, a receiving and draining nozzle, a locking device and means for moving the bucket, wherein a protrusion is made at the bottom of the body, characterized in that the jet-forming element is made in the form of a dividing wall, the refractory masonry of which is located on the protrusion between the side walls of the housing, the receiving pipe is located in the lid of the bucket with the possibility of forming a bar a metric ferro lock, with a drain channel being made at the base of the protrusion, the outlet is located above the jet-forming chute made of refractory material and placed on the wall of the dividing wall, the means for moving the bucket are made in the form of three hydraulic lifts connected with each other with the possibility of working one by one, two or three at the same time to provide complex spatial movement of the bucket.

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