RU168547U1 - Roller block for combined caster - Google Patents

Abstract

The utility model relates to metallurgy, in particular to roller blocks for a combined continuous casting machine of curvilinear type. The roller block for combined caster includes an upper frame and a lower frame. The upper frame is pivotally connected to the lower frame. Two upper and lower rotating rollers are located in the common frame, each of the upper and lower rollers is connected to the frame. Each upper roller is made pressed against the workpiece by two hydraulic cylinders and rotating from a mounted electric drive. Each lower roller is equipped with two hydraulic jacks installed in the frame sockets under the bearing support, while the group of hydraulic jacks is equipped with a common hydraulic lock. To implement the soft reduction mode, the upper and lower rollers are made with a smooth barrel without recesses, in contrast to the rollers of the secondary cooling zone of the CCM made with a recess on the barrel under the circle. The utility model solved the problem of obtaining a continuously cast billet on a combined continuous casting machine in the mode of soft reduction with a bloom cross section and a round billet, without requiring transshipment (change) of equipment during the transition from one section shape to another.

Description

The utility model relates to metallurgy, in particular to roller blocks for a combined continuous casting machine of curvilinear type.

Known correctly-pulling device caster for A. with. USSR No. 287250 (published on November 19, 1970), including a bed, upper rolls mounted in movable levers, lower base rolls installed in the grooves of the bed base, clamping hydraulic cylinders mounted on the bed and connected to the levers.

A disadvantage of the known correct pulling device on a continuous casting machine with a curved axis is that it extends the fully hardened workpiece by exposing the base rolls at different heights with the help of gaskets placed in the grooves of the base of the bed.

From the description to A.S. USSR No. 454082 (publ. 12/25/1974) it is known correctly-pulling device of a continuous casting machine of radial type steel, containing upper rolls installed in the guides and having the ability to move and lower rolls made movable and installed in the same carriage with the upper rolls.

The known correct-pulling device guides and compresses the workpiece of the same cross-sectional shape.

From the description of the patent of the Russian Federation No. 2511414 (publ. 04/10/2014) the guide segment of the stream of the cassette structure with a separate installation of rolls is known. The guide segment comprises an upper and lower frame, while the upper frame is detachably connected to the lower frame, several guide rollers, each of which is connected to the frame, while the two directly adjacent upper rollers are equipped with a device with two hydraulic cylinders for displacing the rollers in the direction across the elongation continuously cast billets, and opposite to the displaced upper rollers are non-displaceable lower rollers.

Known guide segment is the closest in technical essence, but is applicable for the manufacture of continuously cast billets, preferably with a cross section of a slab or thin slab.

The proposed utility model solved the problem of obtaining a continuously cast billet on a combined continuous casting machine in the mode of soft reduction with a bloom cross section and a round billet, without requiring transshipment (change) of equipment during the transition from one form of section to another.

To achieve this technical result, in a roller block for a combined continuous casting machine containing a pair of upper and lower rollers located in a common frame, each of which is interconnected with the frame, each upper roller being made pressed by two hydraulic cylinders pressed to the workpiece; the upper rollers are made rotating from the mounted electric drives, and each lower roller is single and equipped with two hydraulic jacks installed in the frame seats under the bearing support, while the group of hydraulic jacks is equipped with a common hydraulic lock, in addition, for the implementation of the soft reduction mode, the upper and lower rollers are made with a smooth barrel without recesses, in contrast to the rollers of the secondary cooling zone of the continuous casting machine made with a recess in the barrel under the circle.

Distinctive features of the proposed roller unit for combined CCM is that the upper rollers are made rotating from mounted electric drives, and each lower roller is single and equipped with two hydraulic jacks installed in the frame seats under the bearing support, while the group of hydraulic jacks is equipped with a common hydraulic lock, except Moreover, for the implementation of the soft reduction mode, the upper and lower rollers are made with a smooth barrel without recesses, in contrast to the rollers of the secondary cooling zone NLZ made with a notch on the barrel of a circle.

The presence of essential features makes it possible to obtain a continuously cast billet with a bloom and circle cross section on a combined continuous-casting machine of curvilinear type with two basic radii in the soft crimping mode, without requiring a change in the crimping equipment when switching from one section shape to another, since roller blocks allow passing through yourself and the circle, and bloom, changing the base radius due to the rise - lowering of the lower rollers.

The proposed roller unit for combined caster is illustrated by the drawings shown in FIG. 1-6.

In FIG. 1 shows a layout of roller blocks on a continuous casting machine.

In FIG. 2 is a general view of a roller block.

In FIG. 3 - section along aa.

In FIG. 4 - a section along BB.

In FIG. 5 is a view of a hydraulic jack.

In FIG. 6 is a side view of a hydraulic jack.

On a combined continuous casting machine (CCM) of a curvilinear type, four roller blocks 1 are installed in the expansion zone. Each roller block 1 contains two pairs of rollers 2, 3 mounted in an articulated upper 4 and lower frame 5. The drive 6 of the upper rollers 2 is mounted and the pressure of each of the rollers to the continuously cast billet 7 is carried out using two hydraulic cylinders 8. The lower rollers 3 are single and equipped with two hydraulic jacks 9 installed in the seats of the lower frame 5 under the bearing bearings 10. The group of jacks is equipped with a common hydraulic lock 11, not allowing all the lower rollers to fall down. The distance between the centers of adjacent rollers is minimal and does not exceed 0.9 ... 1 m.

Each lower roller 3 has the ability to lower or rise by h from 2 hydraulic jacks 9, while the pressure in the system can be small, of the order of 1 MPa due to the hydraulic lock 11.

To obtain high-quality bloom, the rollers 2, 3, implementing the soft reduction mode, have a smooth barrel without recesses (Fig. 3), while the rollers 12 of the secondary cooling zone and live rolls have a recess on the barrel under the circle (Fig. 4).

The operation of the roller blocks is as follows.

To obtain a continuously cast billet with a circle section, the lower rollers 3 are in the lower position, i.e. the roller housing abuts against the supporting surface of the frame, as shown in FIG. 6. In this case, the plunger of the hydraulic jack 9 does not reach the lower position and does not rest against the bottom of the jack. When casting a circle, the hydraulic cylinders 8 compress the workpiece, working on the pressure value.

During the rebuilding of the continuous casting machine, a pressure of about 1 MPa is applied to the casting of blooms in hydraulic jacks 9, the plungers raise both roller bodies to the stop, making a stroke of h mm. Due to the hydraulic lock 11, an incompressible cushion is created, which keeps the roller from lowering under pressure of the upper roller 2 on the continuously cast billet 7 and lower roller 3. When casting the bloom, the hydraulic cylinders 8 compress the workpiece by working with a position sensor.

The economic effect of the application of the utility model is achieved by reconstructing the existing continuous-type continuous caster. The proposed set of 4 universal blocks will replace 5 stands and allow pouring workpieces of various shapes: round cross-section without soft compression and blooms with soft compression.

Claims (1)

A roller block for a combined continuous casting machine comprising articulated upper and lower frames, in which two upper and lower rotating rollers are located, each upper roller being made pressed by two hydraulic cylinders against the workpiece, characterized in that it is equipped with electric drives connected to the upper rollers, the lower rollers are idle, each of which is equipped with two hydraulic jacks installed in the frame seats under the bearing support, while hydraulic mkraty provided with common hydraulic lock and the upper and lower rollers are made with a smooth barrel.

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