DE102011120120A1 - Method for continuous casting square/round steel segment with oscillating mold, involves providing rotation device to transversely move trolley used for transporting scaffold on guide tracks which are arranged vertical to casting unit - Google Patents

Abstract

The method involves providing three steel segments (1-3) which are arranged at predetermined angle and are clamped by pivots (4,5). The scaffolds are arranged on segments and hydraulic clamping elements are arranged between base portion and insert portion of the segments. A rotation device is provided to transversely move the trolley used for transporting scaffold on guide tracks which are arranged vertical to casting unit. The scaffold is returned to the exchange site and scaffolds arranged in trolley are reloaded to parking space. The insert portion is removed from the base portion. Several stands are attached in inclined position with respect to the insert portion. A pair of fixed stops is arranged at the left and right sides of the insert portions. The insert portion is connected with the plate using screws. The rollers and scaffold are exchanged from the casting line to exchange site. The scaffolds are loosened from the insert portion by hoist. An independent claim is included for continuous casting installation.

Description

introduction

Because can not be produced during the change of segments due to wear or format change, a good application depends on a favorable method of segment change in order to achieve the shortest possible loss time for production.

As a rule, today you can reach times between 15 and 25 minutes for the segment change.

The methods used are slightly different for the different plant manufacturers.

The following applications also have segment changing facilities:

1. DE 2908 476 A1:

The segments are mounted in stationary, straight guides, and one segment each can be pulled out of the stationary guide via a pulling member.

A replacement segment can be inserted in the opposite way.

The paths are very long for a short time.

2. DE 35 24 554 C2:

The segments are attached to a swivel arm and brought into a transfer position, from where they are driven to the repair shop and replaced.

The paths are very long for a short time.

3. DE 10 21 0988 A1:

The segments are releasably secured in segment carriers. A loosened segment can be transported in a guideway by means of chain, traverse and crane up to the casting platform.

The paths are very long for a short time.

The task is to find a solution that manages with short paths (and thus a short time).

In the solution proposed here, the relevant distance is of the order of magnitude of the length of a segment insert, which can be traversed horizontally at rapid traverse speed. With that you can achieve a short main time of the order of 1 minute.

This article describes how a segment change with a short changeover time could work. This solution can be used both for a strand guide with rollers mounted on both sides as well as for those with cantilevered rollers.

A short change of segment provides the best conditions for a higher output, because a longer time can be produced.

A fast segment change is also advantageous when using a rotary mold ( DE 10 2010 035 723.5 ) or with new cold-rod technology ( DE 10 2010 045 223.8 ) wants to work to realize a quick format change in the strand cross-section and to reduce the non-productive time.

solution

It is proposed to separate assembly work and transport tasks and to use tilting segments with base segment and segment insert. The segment inserts carry guide frames. Of the Change of scaffolding takes place outside the casting line at 2 distant changing places. From there, the transport starts to the repair workshop, where the scaffolding is processed.

By way of example, it will be assumed that a billet caster with 3 segments is used, whereby in each segment insert 3 stands for strand guidance are present. 1 scaffold consists of 3 rolls under 120 °. You can use both sides mounted rollers or cantilevered rollers.

For casting, the 3 segments with their segment inserts are in an oblique position (clamped) according to their position in the 90 Bogenstranggieß plant. To change the segment insert, each segment is swiveled to a horizontal carriageway position and the segment insert is moved. The 3 frames of each segment insert can later be tilted and dismantled manually at the change location.

In the frame change position, the frameworks can be packed by means of a turning device with hoist in level zero and raised above holes in the floor slab. The old scaffolding is placed on trolleys and a new scaffold is lowered down and fixed again in the segment insert.

The trolleys and the turning device are movable and can be used for each wire. - The solution is described in 15 pictures.

Figure 1 shows an example of a continuous caster with 3 segments, each with 3 roller units per segment.

It can be seen that here are 3 segments ( 1 . 2 . 3 ) were selected with a central angle of 28 degrees. Thereafter, the backbend driver (behind the segment III) closes ( 51 ), in which due to the larger forces no flying deformation rollers can be used.

The 3 segments are the same in this variant except for the joint and can be motor-driven to pivot points firmly anchored in the system ( 4 . 5 ) and then clamped. In this illustration, the casting position of the 3 segments is shown.

Figure 2 shows in side view the 3 segments ( 6 . 7 . 8th ) in the horizontal worked in the change position.

The gap between the lanes can be mitigated by staggered Einzelradlagerung the wheels on the segment inserts.

Segment I is in the uppermost horizontal plane I.

Segment II is in a middle horizontal plane II.

Segment III is in a lower horizontal plane III above the rebound driver.

The 3 levels are at different heights. In each segment, the scaffolds ( 12 ) arranged with roller guide for the strand on a bow structure.

In picture 3 one sees that each segment consists of basic segment ( 10 ) and segment use ( 11 ). The basic segment ( 10 ) always stays in the system, the segment insert ( 11 ) is centered in the segment in 2 levels and clamped, and can be moved horizontally in the horizontal position of the base segment on a carriageway, which finds its continuation in the area of the structure and leads to the framework exchange place. You can also see the 3 scaffolding ( 12 ).

Figure 4A shows an example of the hydraulic clamping elements ( 14 ) between basic segment ( 10 ) and segment use ( 11 ) in the 1st level. The clamping in the 2nd level is not shown.

Furthermore, it can be seen that the segment insert ( 11 ) of a locomotive ( 17 ) from the basic segment ( 10 ) can be pulled out.

In segment use ( 11 ) are the 3 scaffolding ( 26 ), which are inclined in this position to each other; the middle frame always stays straight.

In the picture you can see the basic segment ( 10 ) and the segment insert ( 11 ) arranged one above the other.

It can also be seen how a total of 5 stationary hydraulic cylinders perform the clamping. The central cylinder ( 15 ) has a T-section piston that engages a T-slot and can pull down the segment insert cart for clamping. The segmented insert car does not support itself on the wheels ( 16 ), but on the upwards driven 4 weight cylinders. The wheels ( 16 ) are then about 1 mm in the air.

In Figure 4B, a proposal for the position positioning of the 2 segment inserts ( 11A . 11B ) in the basic segment. Shown is the left of the picture the position and movement of ( 11A ) and on the right in the picture the position and movement of ( 11B ).

The right end position for the exact horizontal position of the segment insert left ( 11A ) should by a stat. Fixed stop ( 58 ) at the right end of the basic segment ( 10 ) are formed.

The left end position for the exact horizontal position of the segment insert right ( 11B ) should by a station. Fixed stop ( 59 ) at the left end of the basic segment ( 10 ) are formed.

The two hard stops are able to offset each other, but do not hinder the passage of the other segment use (Einzelradlagerung). In the casting operation, when the base segment is rotated in an oblique position and when the locomotive is decoupled, must for clamping in this plane a counterforce to stat. Fixed stop by a hydraulic lever ( 60 . 61 ), which are in the same plane as the stat. Fixed stop acts and so the respective segment use also stuck in oblique operating position of the basic segment.

Figure 5 shows the example of a small square a guide with three rollers, of which the 2 side rollers ( 18 ) are equipped with flying support discs with calibration. The bottom fixed roller ( 19 ) is mounted on both sides. One recognizes in a section the basic segment ( 10 ), the segment usage ( 11 ) and the middle framework ( 12 ).

Each of the 3 frameworks of a segment is on a plate ( 20 ) fitted with the segment insert ( 11 ) by screws or wedges ( 21 ) are connected.

At the changing places ( 34 . 35 ), the 3 old scaffolds of each segment are successively detached from the segment insert with the aid of a mechanic and inserted into the lifting gear of the level-zero 180-degree rotating device ( 37 ).

You can also see the joints well ( 22 ) for the tilting of the basic segment ( 10 ). The basic segments always remain stationary in the system.

In Fig. 6, the example of a large square ( 24 ) a 3-roller guide shown. One recognizes that in the repair workshop by some change parts ( 23 ) with the same roller housings a strand guide for the large square ( 24 ) can be put together.

The support rollers in the scaffolds are only replaced if they are worn or damaged.

In Figure 7, an adjustable square guide with 2 crowned, cantilevered side rollers ( 25 ) and a sub-roll mounted on both sides ( 19 ).

By a swing guide for the roller housing you can see the lateral guide rollers ( 25 ) infinitely adjustable from the smallest to the largest square. The reduction of the drive motor ( 55 ) to the support roller is to be controlled by a harmonic drive ( 54 ) respectively. Again, all the scaffolding on a plate ( 20 ), so that at the changing places ( 34 . 35 ) from the fitter the structure of the segment insert ( 11 ) can be solved.

With this type of guidance, you should provide an additional 4th roll per segment twice to guide the strand on the loose side.

Figure 8 shows an assembly aid how to manually swing the two outer frameworks of a segment by means of 2 threaded spindles ( 29 . 30 ), which can also be operated by motor. Each of the 2 tiltable scaffolds (with 3 rollers) is connected to the segment insert via the threaded spindles ( 29 . 30 ) and additionally screwed.

In the change position, all 3 stands are perpendicular to the level of the scaffold insert ( 11 ) so that they are well grasped by the hoist and passed through holes ( 41 ) can be transported upwards in the floor slabs.

Figure 9 shows what it would look like to maintain a large and small size 3-roll design at 120 ° contact angle, given the fast changeover in format size during the casting operation.

It uses spherical rollers with point contact for the guidance of round sections, a very simple solution.

In Figure 9 below it is shown that for this type of adjustment advantageous swing housing ( 52 ) can be used with hydraulic adjustment, so that you can change the format size without removing the scaffolding.

In the event that floating rollers are selected, the use of carbide rollers is particularly advantageous because the high thermal hardness of carbide promises a long service life.

Figure 10 shows in a vertical section ( 33 ) the various levels (I, II, III, IV) of the plant and the 5 storey ceilings A, B, C, D, E. The course of the 90 ° arc of the casting plant ( 36 ) is marked.

It can be seen that in the 3 levels I, II and III the basic segments are in a horizontal position. The hydraulic cylinders required for pivoting the basic segments ( 9 ) always stay in the plant.

In the picture are 3 mobile segment inserts with worn roles in the levels I, II and II shortly before the horizontal wegtransport from the basic segment by a locomotive. - Each segment insert ( 11 ) can be moved laterally to a right change position ( 35 ), which is about 6 m-20 m away from the casting line (in the same plane), so that fitters can work there.

At the same time, starting from the left waiting position ( 56 ) Another, equipped with new scaffolding segment insert car, also pushed by a locomotive. After about 1 minute, he has the target position in the basic segment ( 10 ), where it is centered and clamped. In addition, the base segment is tilted and the coolant hoses are connected by means of a quick-release coupling. The plant is ready to pour again.

The described change of the segment inserts can be carried out in all 3 levels according to the same principle.

It can also be seen that the hole ( 44 ) in the floor ceiling in the right exchange position z. At the moment it is located exactly above the middle frame. By moving the segment wagon ( 11 ), the two outer frameworks can be successively brought into the interchangeable position.

This applies to both change positions left and right ( 34 . 35 ).

In addition, it is easy to see that in level III the basic segment ( 10 ) can be pivoted so in a horizontal position that the removal of the segment wagon ( 11 ) is possible over the backbend driver.

Figure 11 shows the change of segment inserts once again in a diagram.

It becomes clear that the scaffolds are changed alternately once in the right position, then once in the left position.

Shown is always an example of a segment insert with 3 stands.

To change the segment inserts, the wait positions ( 56 . 57 ) started.

Figure 12 shows in a plan view, with which machines the dismantled scaffolds are transported, from the various planes I, II and III to the plane zero (0), by vertical transport, and within the plane zero (0) with horizontal transport.

For vertical transport, a 180 degree rotating device ( 37 ) used, which is transversely movable and can be adjusted to each vein. - For horizontal transport of scaffolding one uses transport trolleys ( 39 ), which are also movable and can reach the various veins of the casting plant.

Picture 13 shows the 180 degree turning device ( 44 ) is shown in a vertical section through the system. The left arm with its hoists one after the other brings scaffolds from the levels I, II and III upwards.

Then the turntable pivots 180 degrees and drops the packed old scaffold into a zero-level dolly.

The gripping of a new scaffolding with the right arm and the return transport to the segment insert wagons take place analogously, only vice versa. Automation of the described operations is well possible.

Figure 14 shows in a reduced version again a vertical section through the system, this time so that the two changing places ( 34 . 35 ) to the left and right of the pouring line. In addition, it can be seen that the backbend driver is located at a lowest level.

Figure 15 shows a plan view with the important machines in the plane zero. This is also the Tundishwagen ( 48 ). It can be seen that its track ( 49 ) does not collide with the travel paths of the rotary devices.

As endpoints for the trolleys ( 39 ) there are 2 parking spaces ( 50 ) for the scaffolding. From there, the scaffolding can be brought to the repair workshop by hall crane.

Short version (picture 11)

In the diagram, the principle of segment replacement is shown with simple symbols. It is proposed to use motorized pivoting segments. Each segment should consist of a basic segment and segment usage. The segment insert ( 11 ) is in the basic segment ( 10 ) centered and clamped and can be moved out of the basic segment with its wheels on a horizontal guide with loosened clamping to 2 changing places on each level, one of which is located on the left and a second on the right. There, the frames of the segment insert are changed and with the help of a 180-degree turning device ( 37 ) is transported up in level zero. At level zero, the scaffolding is transported to a parking lot by a trolley ( 50 ) brought. From there, they can be transported to the repair workshop by hall crane.

The reconditioned scaffoldings (with flying or double-sided storage) are brought back to the segment use in the opposite way and assembled there manually. Later, the newly prepared segment segment will be returned to the basic segment.

Enough time is available for manual assembly operations to change scaffolding. The exchange of the two segment inserts is automated and can be done in a short time. There are 2 segment inserts per segment, which can be used for casting.

In addition, several advantageous strand guides for the casting of square and round are described, working with cantilevered rollers.

Pictures directory

Fig. 1: Side view Continuous arc casting plant with 3 segments in casting position

Figure 2: Side view with 3 tilted segments in the change position

Fig. 3: Basic segment and segment insert

Figure 4A: Clamping segment insert in the base segment

Fig. 4B: Position positioning Segment insert in the basic segment

Image 5: Leadership square Klein

Picture 6: Leadership Square Great

Figure 7: Adjustment guide for square

Figure 8: Segment insert with 3 stands

Figure 9: 3-roller design for round cross sections

Figure 10: Vertical section Casting plant with changing place left and right

Figure 11: Scheme of segment insert change

Figure 12: Top view of a 4-core casting plant

Picture 13: Cut casting machine with 1 turning device and trolley for scaffolding

Picture 14: Cut casting machine with 2 turning devices

Fig. 15: Top view of a 6-core caster with movable tundish cart with 2 rotating devices Reference numeral directory

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102010035723 [0016]
• DE 102010045223 [0016]

Claims (9)

Method and device for steel continuous casting of round and square cross-sections with oscillating vertical mold and subsequent secondary cooling or strand guidance in the form of a circular arc or oval arc plant, consisting of different (here 3) segments with 3 interpolation points (scaffolding) per segment in the 3-roller design, characterized in that a mechanized segment insert change is proposed with short change time, which consists of 6 measures, of which the first measure according to Figure 3 is that each segment consists of base segment and segment insert, the releasable by each other power-operated clamping elements are connected, and of which the 2nd measure according to Figure 2 is that each segment is power-tilted, the working position is inclined during casting and wherein the change position means a horizontal position of the segment in which the wheeled old Segment insert ( 11 ) with released clamping in a short time from the basic segment ( 10 ) and can be exchanged for a segment insert with new support rollers, and of which the third measure according to Figure 10 consists in that for each segment 2 change places ( 34 . 35 ), on which the scaffolds ( 12 ) from the segment application ( 11 ) and carried away upwards, and wherein the first ( 34 ) of the 2 change slots to the left of the basic segment ( 10 ), and wherein the second change location ( 35 ) is arranged to the right of the basic segment, and wherein both segment inserts by a locomotive ( 17 ) or by self-propelled from the first slot ( 34 ) to the base segment or vice versa, wherein the joint of the road rails is mitigated by a staggered Einzelradlagerung the wheels of the S.-Einsatzwagen. of which the fourth measure is that according to figures 10 and 11, two segment inserts ( 11 ) per segment, an old one in the operating position for casting and a new one in the waiting position ( 56 . 57 ) and that these two segment inserts are simultaneously moved in the same direction with their own drive, the method according to which the new segment insert is now in the base segment, while the old segment insert continues into a change position, in which the old frameworks are exchanged for new scaffolding, and that the new segment insert in the basic segment is a power-operated position positioning by fixed stop ( 58 . 59 ) and clamping levers ( 60 . 61 ) before the power-operated clamping via a hydraulic central cylinder ( 15 ) and 4 hydraulic weight cylinders ( 14 ) is activated, and that now only the locomotive must be released from the segment insert and the base segment must be pivoted to the casting position, so that then the casting can be continued, and of which the 5th measure according to Figure 10, 12, 13, 14 therein that the exchange of scaffolding ( 12 ) at the changing places ( 34 . 35 ) can be done manually at a good distance from the casting line, with the aid of two 180-degree rotating devices ( 37 ) with hoists ( 46 ) at 2 arms in level zero and using different holes ( 41 ) in the floor slabs from the segment insert ( 11 ) dissolved old scaffolds ( 12 ) are conveyed upwards by hoisting gear, from where, after 180-degree rotation of the rotary device ( 37 ) on a trolley ( 39 ) are placed in plane zero, and wherein turning device and transport carriage on guideways ( 38 . 40 ) are movable perpendicular to the Gießadern so that they are to be used for all wires of the casting plant in succession, and wherein the new, processed in the workshop scaffolding ( 12 ) are transported back in the opposite way as on the way to the respective change place ( 34 . 35 ), where they are used by fitters in the segment missions ( 11 ) and fastened before the newly refitted segment insert into the waiting position ( 56 . 57 ) and waiting for the next segment replacement, and the sixth measure according to Figure 15 is that the transport vehicles ( 39 ) with the scaffolding ( 12 ) to 2 parking spaces ( 50 ), from which the frameworks are reloaded onto the hall crane and then taken to the repair workshop, where they are reconditioned. Continuous casting plant according to claim 1, characterized in that the described method is intended to apply both to 3-roller stands for strand guidance with both sides mounted central support rollers as well as cantilevered support rollers for lateral guidance of the strand. Continuous casting plant according to claim 1, characterized in that when using strand guide rollers with flying bearings rollers made of hard metal are used for the support of round and square sections. Continuous casting plant according to claim 1, characterized in that the method described also applies to the quick change of segments for continuous casting for large round cross-section, for Vorblockformate and for preforms for profiles. Continuous casting plant according to claim 1, characterized in that the described method with modified mechanics can also serve for the exchange of cantilevered support rollers instead of scaffolding of a segment, which is then also carried out at the 2 changing places, so that then not 3 scaffolding, but successively 3 × 3 = 9 support rollers are transported to the repair workshop for rework, which are then replaced by 9 prepared support rollers from the repair workshop by means of assembly work. Continuous casting plant according to claim 1, characterized in that (Figure 5 and 6) that a 3-roller guide is used to guide a square cross section, with 2 lateral rollers are used at 90 degrees with flying support discs, while the lower central fixed roller is mounted on both sides, and wherein the cantilevered support discs ( 18 ) are calibrated so that they can also lead the square laterally, and wherein the change from small square to large square by some removable parts ( 23 ) can be performed very easily in the repair shop with the same roller housings, the segment replacement is performed in a short time as described in the main claim. Continuous casting plant according to claim 1, characterized (according to FIG. 7), that for guiding a square cross-section an adjustment guide with 2 convex, cantilevered support rollers (FIG. 25 ) and 1 on both sides mounted lower roll ( 19 ), whereby the speed reduction in the roller housings by a harmonic drive gear ( 54 ) is generated, and wherein the described mechanism on a plate ( 20 ) mounted with screws or wedges ( 21 ) is attached to the segment insert, and wherein by a swing guide for the 2 side roller housing, the strand guide can be adjusted in size change continuously over two hydro-cylinder, and wherein twice per segment an additional 4th role for guiding the strand is provided on the lot side , Continuous casting plant according to claim 1, characterized (according to Figure 8), that as an assembly aid for changing the 2 side inclined scaffolds ( 26 ) from the segment insert car ( 11 ) on each side a device with 2 threaded spindles ( 29 . 30 ) is used, wherein each threaded spindle is held in a pivotable nut, which in a housing ( 28 ), which is attached to the segment insert car, and that instead of the manual operation for the threaded spindles ( 29 . 30 ) can also be a motorized operation by hydraulic motors can be used, which can be supplied by permanently installed hydraulic lines via quick-release couplings at the 2 changing places with energy. Continuous casting plant according to claim 1, characterized, that it is also possible to equip systems with a larger casting arc radius with more than 3 segments and 9 stands with the described segment change, by z. B. a system designed with 4-6 segments, wherein in each segment again 3 scaffolds are provided for strand guidance, so that the principle of rapid segment replacement and the manipulation of the scaffolding at 2 changing places is maintained.

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