CN117862443A - Compact type heavy sector section for slab continuous casting machine and slab continuous casting machine - Google Patents

Abstract

The invention provides a compact type heavy sector section for a slab continuous casting machine and the slab continuous casting machine, comprising a frame, a pressing roller and a driving device; the frame comprises an upper frame and a lower frame which are oppositely arranged up and down, a pull rod which is connected between the upper frame and the lower frame in a hinged manner, a lifting beam arranged on one side of the upper frame and a connecting beam which is arranged on the lower frame and corresponds to the lifting beam in position; the top parts of the two ends of the lifting beam are respectively provided with a first pressing mechanism and a second pressing mechanism, the middle parts of the two ends of the upper frame are respectively provided with a hydraulic clamping mechanism, and the lower ends of the hydraulic clamping mechanisms are arranged on the lower frame; the pressing roller includes a driving roller and a free roller. The invention can solve the problems that in the prior art, the strength and the rigidity of the conventional slab continuous casting sector section are insufficient, and the deformation resistance of a casting blank can not be born under the condition of large reduction, and the sector section is compact in arrangement, small in occupied space and particularly suitable for accelerating transformation under the condition of limited workshop length.

Description

Compact type heavy sector section for slab continuous casting machine and slab continuous casting machine

Technical Field

The invention relates to the technical field of continuous casting production, in particular to a compact heavy sector section for a slab continuous casting machine and the slab continuous casting machine.

Background

The casting blank with the width-thickness ratio larger than 3 is called a slab, and the slab continuous casting is a continuous casting technology which takes the slab as a main product. The casting section size of the conventional slab caster is as follows: the thickness is 150-250 mm, and the width is 1000-1800 mm; the width of the narrow plate blank is within 700mm, and the thickness is about 120-150 mm. The continuous casting slab is mainly used for rolling flat plate (thick plate, middle plate, thin plate and coil) materials.

Under the current continuous casting production conditions, the internal quality problems of center segregation, center porosity and the like are a great difficulty of continuous casting slabs, and the solidification end pressing technology is correspondingly proposed and widely used for solving the segregation problem. The light pressing of the solidification tail end of the bloom is mainly finished by pressing by an air-cooled zone withdrawal and straightening machine, the single-roller pressing amount is generally not more than 5mm, and the total pressing amount is generally not more than 15mm. With the increase of the section of the casting blank, the drawing speed of the continuous casting machine is low, the casting blank at the solidification tail end of the casting blank is thick, the deformation resistance of the casting blank is large, and the like, the penetration efficiency of the reduction to the core of the casting blank is obviously reduced, and the conventional light reduction can not completely compensate the solidification shrinkage. At the same time, at the final stage of solidification of the casting blank, a natural temperature gradient (up to 500 ℃) is formed between the surface and the core of the casting blank, if the high deformation amount is pressed at the moment, the process effects of welding central shrinkage cavity and even refining core austenite grains can be achieved, and the solidification end weight pressing technology is adopted.

The existing continuous casting slab solidification end heavy pressing technology is realized by adopting various technical modes, for example, the Pump POSHARP technology is used for modifying a sector section to enable the sector section to have large pressing capability, wherein the former sector section finishes light pressing before solidification ends, the latter sector section finishes large pressing at solidification end positions, on a 400mm thickness continuous casting machine, a low solid phase region (fs=0.5-0.6) in a solidification casting blank adopts 5-20mm/m pressing, and the pressing rate is increased, but the technology mainly focuses on solving the center segregation problem. In addition, the metal PCCS technology adopts a two-roll pressing roughing mill mode, and the reduction of more than 10mm is applied to the solidification tail end of the continuous casting blank with the thickness of 300mm, so that the internal center porosity of a casting blank is improved, and the process can be used for producing a thick plate with the thickness of 150mm and 600 MPa.

In view of the above-described trend of continuous casting technology, in order to improve the problem of central porosity of slabs, a smaller compression ratio is used to produce thick slabs, and a large reduction is generally applied to a cast slab during continuous casting. To implement this technique, work is required on the basis of existing slab segments. However, the strength and rigidity of the conventional slab continuous casting sector are insufficient at present, and the deformation resistance of a casting blank under the condition of large reduction cannot be born. The maximum pressing capacity is generally not more than 8mm, so that a sector section structure capable of effectively applying large pressing amount to a slab on the basis of the original slab sector section is lacking at present.

Disclosure of Invention

In view of the above problems, the present invention aims to provide a compact heavy segment for slab caster and a slab caster, so as to solve the problem that in the prior art, the strength and rigidity of a conventional slab caster segment are insufficient, and the deformation resistance of a casting blank cannot be born when a large reduction is performed, and therefore, a segment structure capable of effectively applying a large reduction to a slab on the basis of an original slab segment is lacking.

The invention provides a compact type heavy sector section for a slab continuous casting machine, which comprises a frame, a pressing roller and a driving device; the frame comprises an upper frame, a lower frame, a pull rod, a lifting beam and a connecting beam, wherein the upper frame and the lower frame are oppositely arranged up and down, the pull rod is hinged between the upper frame and the lower frame, the lifting beam is arranged on one side of the upper frame, and the connecting beam is arranged on the lower frame and corresponds to the lifting beam in position; the top parts of the two ends of the lifting beam are respectively provided with a first pressing mechanism and a second pressing mechanism, the middle parts of the two ends of the upper frame are respectively provided with a hydraulic clamping mechanism, and the lower ends of the hydraulic clamping mechanisms are arranged on the lower frame; the pressing roller comprises a driving roller and a free roller arranged at one side of the driving roller; the driving rollers comprise an upper driving roller arranged at the bottom of the lifting beam and a lower driving roller arranged at the top of the connecting beam; the free roller comprises an upper free roller arranged between two ends of the upper frame and a lower free roller arranged between two ends of the lower frame; the upper free roller and the lower free roller are correspondingly arranged up and down; the driving device comprises an upper driving device connected with the upper driving roller and a lower driving device connected with the lower driving roller.

Furthermore, it is preferable that the slab caster is mounted with a compact heavy segment at the rear end of the horizontal segment of the caster.

Furthermore, it is preferable that the frame is disposed outside the concrete wall of the secondary cooling chamber.

In addition, preferably, the upper driving device comprises an upper coupler connected with one end of the upper driving roller and an upper motor connected with the upper coupler; the lower driving device comprises a lower shaft coupling connected with one end of the lower driving roller and a lower motor connected with the lower shaft coupling.

Furthermore, it is preferable that the number of the free rollers is two pairs; the number of the driving rollers is one pair, and the driving rollers are arranged at the outlet of the sector section; the method comprises the steps of carrying out a first treatment on the surface of the The horizontal roller spacing of the pressing roller is more than or equal to 450mm; the diameter of the pressing roller is more than or equal to 400mm.

In addition, preferably, the first pressing mechanism is a first pressing oil cylinder; the second pressing mechanism is a second pressing oil cylinder; the movable ends of the first depressing oil cylinder and the second depressing oil cylinder are respectively connected with two ends of the lifting beam.

In addition, preferably, the hydraulic clamping mechanism is a clamping cylinder.

Furthermore, it is preferable that water receiving devices are provided at both sides of the lower frame.

The invention provides a slab continuous casting machine; comprising a caster body and further comprising a compact heavy sector for a slab caster as described above.

Furthermore, it is preferred that the number of compact heavy segments for the slab caster is at least one.

According to the technical scheme, the compact type heavy sector section for the slab continuous casting machine and the slab continuous casting machine provided by the invention can increase the metallurgical length in a limited continuous casting workshop through the compact structural design of the frame, the pressing roller and the driving device, and are suitable for the rapid transformation of an old slab casting machine; the rigidity of the sector body can be increased, the clamping capacity of the sector is increased, the frame stress of the sector can reach kilotons, the structure is stable compared with that of a common sector, the reduction of the solidification tail end can be obviously improved, the smooth pulling-out of a casting blank in the reduction process is ensured, and the stable and effective implementation of the reduction process is ensured; the invention can effectively solve the problems that the strength and the rigidity of the conventional slab continuous casting sector section are insufficient and the deformation resistance of a casting blank can not be born under a large reduction.

To the accomplishment of the foregoing and related ends, one or more aspects of the invention comprise the features hereinafter fully described. The following description and the annexed drawings set forth in detail certain illustrative aspects of the invention. These aspects are indicative, however, of but a few of the various ways in which the principles of the invention may be employed. Furthermore, the invention is intended to include all such aspects and their equivalents.

Drawings

Other objects and attainments together with a more complete understanding of the invention will become apparent and appreciated by referring to the following description taken in conjunction with the accompanying drawings. In the drawings:

fig. 1 is a schematic front view of a compact heavy sector for a slab caster according to an embodiment of the present invention;

fig. 2 is a schematic top view of a compact heavy sector for a slab caster according to an embodiment of the present invention;

fig. 3 is a schematic side view of a compact heavy sector for a slab caster according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a slab caster according to an embodiment of the present invention.

In the drawing, 1-upper frame, 2-lower frame, 3-pull rod, 4-lifting beam, 5-connecting beam, 6-first pressing mechanism, 7-second pressing mechanism, 8-hydraulic clamping mechanism, 9-driving roller, 10-free roller, 11-upper coupler, 12-upper gear motor, 13-upper motor, 14-lower coupler, 15-lower gear motor, 16-lower motor, 17-horizontal fan section, 18-two cold room concrete wall, 19-ladle, 20-ladle turret, 21-tundish car, 22-tundish, 23-crystallizer, 24-bending section, 25-hydraulic vibrating device, 26-arc fan section, 27-straightening fan section, 28-fire cutter, 29-dummy bar, 30-roller table, 31-workshop column, 32-workshop crane.

Detailed Description

In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details.

Aiming at the problems that in the prior art, the strength and the rigidity of a conventional slab continuous casting sector are insufficient, the deformation resistance of a casting blank cannot be born when the reduction is large, and a sector structure capable of effectively applying the reduction to a slab on the basis of the original slab sector is lacking, the invention provides a compact heavy sector for a slab continuous casting machine and the slab continuous casting machine.

Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

In order to illustrate the compact heavy sector for slab caster and slab caster provided by the present invention,

fig. 1 shows a front view of a compact heavy sector for a slab caster according to an embodiment of the present invention;

fig. 2 shows a top view of a compact heavy sector for a slab caster according to an embodiment of the present invention;

fig. 3 shows a side view structure of a compact heavy sector for a slab caster according to an embodiment of the present invention;

fig. 4 illustrates a structure of a slab caster according to an embodiment of the present invention.

As shown in fig. 1 to 4 together, the compact heavy segment for slab caster provided by the present invention comprises a frame, a pressing roller and a driving device; the frame comprises an upper frame 1 and a lower frame 2 which are arranged vertically oppositely, a pull rod 3 which is connected between the upper frame 1 and the lower frame 2 in a hinged manner, a lifting beam 4 arranged on one side of the upper frame 1 and a connecting beam 5 which is arranged on the lower frame 2 and corresponds to the lifting beam 4 in position; the top of two ends of the lifting beam 4 is respectively provided with a first pressing mechanism 6 and a second pressing mechanism 7, the middle parts of two ends of the upper frame 1 are respectively provided with a hydraulic clamping mechanism 8, and the lower ends of the hydraulic clamping mechanisms 8 are arranged on the lower frame 2; the pressing roller includes a driving roller 9 and a free roller 10 arranged at one side of the driving roller 9; the driving roller 9 comprises an upper driving roller arranged at the bottom of the lifting beam 4 and a lower driving roller arranged at the top of the connecting beam 5; the free roller 10 includes an upper free roller installed between both ends of the upper frame 1 and a lower free roller installed between both ends of the lower frame; the upper free roller and the lower free roller are correspondingly arranged up and down; the driving device comprises an upper driving device connected with the upper driving roller and a lower driving device connected with the lower driving roller.

The upper driving roller and the lower driving roller are respectively arranged on the lifting beam 4 and the connecting beam 5, and respectively rotate under the driving of the upper driving device and the lower driving device, when the first pressing mechanism 6 and the second pressing mechanism 7 are pressed down, the upper frame 1 and the lifting beam 4 are driven to move downwards, the upper driving roller and the upper free roller drop down simultaneously and are pressed on casting blanks passing through the upper driving roller, the upper free roller, the lower driving roller and the lower free roller, the upper driving roller and the lower driving roller rotate under the driving of the corresponding upper driving device and the lower driving device, and the pulled casting blanks drive the upper free roller and the lower free roller to rotate.

Because the width-to-thickness ratio of the slab is large, the uncured casting blank needs to be clamped completely to avoid the casting blank from bulging, and the length of the closely arranged clamping section of the casting blank is larger than the length of the liquid core of the casting blank. The thicker the casting blank, the faster the pulling speed, and the weaker the cooling, the longer the liquid core. The liquid core length calculated according to the maximum pulling speed is the metallurgical length of the continuous casting machine. For slab casting machines, the length of closely spaced clamping segments must be increased to increase the drawing speed, and the number of segments is generally increased at present due to limited increase in the length of the vertical segments of the straight arc casting machine.

The secondary cooling fan-shaped section area is positioned behind the secondary cooling bending section and before the front roller way is cut. The main function of the device is to feed the dummy bar 29, support and guide the casting blank, and the roll gap formed by the inner arc roll and the outer arc roll of the sector section is used for guiding and clamping the casting blank, so as to reduce the bulging strain and straightening strain generated by the two phase boundary of the blank shell under the action of the hydrostatic pressure of molten steel. The initially formed casting blank with liquid core in the crystallizer 23 is guided by the bending section 24 and the fan-shaped section and acted by secondary cooling water, so that the casting blank is completely solidified and pulled out of the continuous casting machine.

The compact type heavy sector section for the slab continuous casting machine provided by the invention is suitable for the rapid transformation of an old slab casting machine by increasing the metallurgical length through newly increasing the compact sector section in a limited continuous casting workshop, can increase the rigidity of a sector section body, increases the clamping capacity of the sector section, has a frame bearing force reaching kiloton, is more stable than a common sector section structure, can obviously promote the reduction of a solidification tail end, can ensure the smooth pulling-out of a casting blank in the reduction process, and ensures the stable and effective implementation of the reduction process.

Specifically, the invention can increase the metallurgical length in a limited continuous casting workshop through the compact structural design of the frame, the pressing roller and the driving device, and is suitable for the rapid transformation of an old slab casting machine; through the arrangement of the upper and lower frames, the hydraulic clamping mechanism 8, the first pressing mechanism 6 and the second pressing mechanism 7 and the arrangement of the driving roller 9 and the free roller 10, the rigidity of the sector body can be increased, the clamping capacity of the sector is increased, the frame stress of the sector can reach kilotons, the structure is more stable than that of a common sector, the pressing-down amount of the solidification tail end can be obviously improved, the smooth pulling-out of a casting blank in the pressing-down process can be ensured, and the stable and effective implementation of the pressing-down process is ensured; the invention can effectively solve the problems that the strength and the rigidity of the conventional slab continuous casting sector section are insufficient and the deformation resistance of a casting blank can not be born under a large reduction.

In a preferred embodiment of the invention, the slab caster is mounted with a compact heavy sector at the rear end of the horizontal sector 17 of the caster. The compact type heavy sector section for the slab caster provided by the invention is convenient to hoist and adjust according to the requirement, and can be hoisted by a workshop crane 32 arranged above the compact type heavy sector section.

In a preferred embodiment of the invention, the frame is arranged outside the concrete wall 18 of the secondary cooling chamber. Is convenient to maintain and install quickly.

In a preferred embodiment of the present invention, the upper driving device includes an upper coupling 11 connected to one end of the upper driving roller, and an upper motor 13 connected to the upper coupling 11; the lower drive assembly includes a lower coupling 14 connected to one end of the lower drive roller, and a lower motor 16 connected to the lower coupling 14.

Specifically, the upper coupling 11 and the upper motor 13 may be connected by an upper gear motor 12; the lower coupling 14 and the lower motor 16 are connected by a lower gear motor 15, thereby facilitating control of the upper and lower drive rollers. And the upper gear motor 12 and the lower gear motor 15 can adopt the same gear motor or control the rotation speed thereof through the same switch, thereby ensuring the synchronous rotation of the upper driving roller and the lower driving roller.

In a preferred embodiment of the invention, the number of free rollers 9 is two pairs; the number of the driving rollers 10 is one pair, and the driving rollers are arranged at the outlet of the sector section; the method comprises the steps of carrying out a first treatment on the surface of the The horizontal roller spacing of the pressing roller is more than or equal to 450mm; the diameter of the pressing roller is more than or equal to 400mm.

Specifically, 2 pairs of free rollers and 1 pair of driving rollers (with the diameter more than or equal to 400 mm) are arranged compactly, the roller spacing more than or equal to 450mm, and the driving device is arranged at the outlet side, so that the balanced distribution of blank pulling force is facilitated, space is vacated, the structural strength of an upper frame and a lower frame is increased, the large reduction of more than 15mm of a single sector section can be realized, the casting blank reduction counter force is born more than or equal to 1100t, the center density of the casting blank is improved, and the looseness is reduced. Of course, the number of free rollers may be adjusted according to actual needs, but in order to reduce the floor space of the sector, it is preferable to arrange the free rollers 10 and the drive roller 9 in the manner of this embodiment. The difficult problems that the conventional seven-roller sector section occupies a large space and is inconvenient to arrange in the pouring span with limited length L can be effectively solved.

In a preferred embodiment of the present invention, the first pressing mechanism 6 is a first pressing cylinder; the second pressing mechanism 7 is a second pressing oil cylinder; the movable ends of the first depressing oil cylinder and the second depressing oil cylinder are respectively connected with the two ends of the lifting beam 4.

In particular, the pressing mechanism is preferably a pressing cylinder, and of course, a similar structure can be adopted instead, and the main function of the pressing mechanism is to drive the lifting beam 4 to move up and down through the pressing cylinder, so as to drive the driving roller 9 and the free roller 10 to move up and down, so as to press the casting blank.

In a preferred embodiment of the present invention, the hydraulic clamping mechanism 8 is a clamping cylinder. This is a preferred embodiment, and of course, similar mechanisms may be used instead, and the present invention is not particularly limited thereto.

Two clamping cylinders 8 are installed in the middle of the upper frame 1, and in order to ensure the space required by adjusting the roll gap, a pressing cylinder can be installed on the upper frame 1 at the outlet side through a supporting steel plate, and the movable end of the pressing cylinder is connected with the lifting beam 4.

In a preferred embodiment of the present invention, water receiving means (not shown) are provided at both sides of the lower frame 2. After the equipment is in place, the secondary cooling air is automatically communicated through the frame and used for further cooling the casting blank.

As shown in fig. 4, the slab caster provided by the present invention; comprising a caster body and further comprising a compact heavy sector for a slab caster as described above.

Wherein, in the continuous casting process, the continuous casting machine main body mainly comprises a ladle 19, a ladle turret 20 for conveying the ladle 19, a tundish 22 arranged at a pouring position, a tundish 21 for conveying the tundish 22, a crystallizer 23 arranged below the tundish, a bending section 24 arranged below an outlet of the crystallizer 23, a hydraulic vibration device arranged outside the bending section 24, an arc-shaped fan-shaped section 26 connected with the bending section 24, a straightening fan-shaped section 27 connected with the arc-shaped fan-shaped section 26, a horizontal fan-shaped section 17 connected with the straightening fan-shaped section 27, a flame cutter 28 arranged at the tail end of the horizontal fan-shaped section 17, a roller way 30 arranged between the outlet of the crystallizer 23 and a casting blank pulling outlet, and a dummy bar 29 arranged on the roller way 30. The head end of the dummy bar 29 is arranged at the outlet of the crystallizer 23, and sequentially passes through the bending section 24, the arc-shaped sector section 26, the straightening sector section 27 and the rear tail end of the horizontal sector section 17 to be arranged at the casting blank drawing outlet. Wherein the compact heavy segment for slab caster provided by the present invention is disposed between the tail end of the horizontal segment 17 and the flame cutter 28 to extend the metallurgical length. The compact type heavy sector section for the slab continuous casting machine is provided with the workshop crane 32 above, and the workshop crane 32 is horizontally arranged above the workshop column 31.

During continuous casting, the dummy bar 29 is fed into the lower opening of the crystallizer 23 through the roller way 30 from a casting blank outlet, sequentially passes through the compact heavy type sector section, the horizontal sector section 17, the straightening sector section 27, the arc sector section 26 and the bending section 24, liquid molten steel in the ladle 19 flows into the intermediate tank 22 through the protective sleeve below the liquid molten steel to be buffered and purified, then is injected into the crystallizer 23 through the immersed nozzle, a casting blank with a liquid core is formed through primary cooling, the casting blank is continuously bent through the bending section 24, then enters the arc sector section 26 to be subjected to secondary cooling and then enters the straightening sector section 27 to be continuously straightened, the straightened casting blank reaches the horizontal sector section 17 and the compact heavy type sector section provided by the invention, is pulled out by the dummy bar 29, and finally the fire cutter 28 cuts the casting blank into required specified lengths to obtain the required qualified casting blank.

Under the existing equipment condition, the invention provides a development path with high productivity and low cost. By improving the pulling speed of the slab continuous casting machine, the hour output of the casting machine can be improved, so that the capital investment is reduced, the reasonable matching of the continuous casting-converter production rhythm can be realized, the advantages of the slab continuous casting production efficiency are fully exerted, the operation cost can be greatly reduced, the energy consumption can be saved, and the purposes of saving energy and reducing emission CO are achieved ₂ Is a target of (a). By arranging the compact heavy segment provided by the invention after the horizontal segment 17, the metallurgical length can be extended and still the segment replacement work can be performed with the shop crane 32.

In a preferred embodiment of the invention, the number of compact heavy sectors for a continuous slab casting machine is at least one. The number of compact heavy sector sections for slab continuous casting machine provided by the invention can be set according to actual needs, and is not particularly limited.

In the slab continuous casting machine provided by the invention, as the compact type heavy type sector section for the slab continuous casting machine is added, the two clamping cylinders are arranged in the middle of the upper frame 1, and the driving device is arranged at the outlet of the sector section, so that space is saved, the structural strength of the upper and lower frames is increased, and the large reduction of more than 15mm of a single sector section can be realized; the metallurgical length can be prolonged by arranging a plurality of groups of compact three-roller fan-shaped sections behind the horizontal fan-shaped section 17, the fan-shaped section replacement operation can still be carried out by utilizing the workshop crane 32, the problems that the conventional seven-roller fan-shaped section occupies a large space and is inconvenient to arrange in a pouring span with limited length L are effectively solved, and the device is particularly suitable for the speed and quality improvement and upgrading transformation of an old slab casting machine.

According to the compact type heavy sector section for the slab caster and the slab caster, provided by the invention, the metallurgical length can be increased in a limited continuous casting workshop through the compact structural design of the frame, the pressing roller and the driving device, and the compact type heavy sector section for the slab caster is suitable for the rapid transformation of an old slab caster; the rigidity of the sector body can be increased, the clamping capacity of the sector is increased, the frame stress of the sector can reach kilotons, the structure is stable compared with that of a common sector, the reduction of the solidification tail end can be obviously improved, the smooth pulling-out of a casting blank in the reduction process can be ensured, and the stable and effective implementation of the reduction process can be ensured; the invention can effectively solve the problems that the strength and the rigidity of the conventional slab continuous casting sector section are insufficient and the deformation resistance of a casting blank can not be born under a large reduction.

The compact heavy sector for a slab caster and the slab caster according to the invention are described above by way of example with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that various modifications may be made to the compact heavy duty segment for a slab caster and slab caster as set forth above without departing from the teachings of the present invention. Accordingly, the scope of the invention should be determined from the following claims.

Claims (10)

1. The compact heavy sector for slab continuous casting machine is characterized by comprising a frame, a pressing roller and a driving device; wherein,

the frame comprises an upper frame, a lower frame, a pull rod, a lifting beam and a connecting beam, wherein the upper frame and the lower frame are oppositely arranged up and down, the pull rod is hinged between the upper frame and the lower frame, the lifting beam is arranged on one side of the upper frame, and the connecting beam is arranged on the lower frame and corresponds to the lifting beam in position; the top parts of the two ends of the lifting beam are respectively provided with a first pressing mechanism and a second pressing mechanism, the middle parts of the two ends of the upper frame are respectively provided with a hydraulic clamping mechanism, and the lower ends of the hydraulic clamping mechanisms are arranged on the lower frame;

the pressing roller comprises a driving roller and a free roller arranged at one side of the driving roller; the driving rollers comprise an upper driving roller arranged at the bottom of the lifting beam and a lower driving roller arranged at the top of the connecting beam; the free roller comprises an upper free roller arranged between two ends of the upper frame and a lower free roller arranged between two ends of the lower frame; the upper free roller and the lower free roller are correspondingly arranged up and down;

the driving device comprises an upper driving device connected with the upper driving roller and a lower driving device connected with the lower driving roller.

2. A compact heavy sector for a slab caster as claimed in claim 1, characterized in that,

the compact heavy sector for slab caster is mounted at the rear end of the horizontal sector of the caster.

3. A compact heavy sector for a slab caster as claimed in claim 2, characterized in that,

the frame is arranged outside the concrete wall of the two cooling chambers.

4. A compact heavy sector for a slab caster as claimed in claim 1, characterized in that,

the upper driving device comprises an upper coupler connected with one end of the upper driving roller and an upper motor connected with the upper coupler;

the lower driving device comprises a lower shaft coupling connected with one end of the lower driving roller and a lower motor connected with the lower shaft coupling.

5. A compact heavy sector for a slab caster as claimed in claim 1, characterized in that,

the number of the free rollers is two pairs;

the number of the driving rollers is one pair, and the driving rollers are arranged at the outlet of the sector section;

the horizontal roller spacing of the pressing roller is more than or equal to 450mm;

the diameter of the pressing roller is more than or equal to 400mm.

6. A compact heavy sector for a slab caster as claimed in claim 1, characterized in that,

the first pressing mechanism is a first pressing oil cylinder;

the second pressing mechanism is a second pressing oil cylinder;

the movable ends of the first depressing oil cylinder and the second depressing oil cylinder are respectively connected with two ends of the lifting beam.

7. A compact heavy sector for a slab caster as claimed in claim 1, characterized in that,

the hydraulic clamping mechanism is a clamping oil cylinder.

8. A compact heavy sector for a slab caster as claimed in claim 1, characterized in that,

water receiving devices are arranged on two sides of the lower frame.

9. A slab continuous casting machine; comprising a continuous casting machine body, characterized by further comprising a compact heavy sector for a slab casting machine according to any one of claims 1 to 8.

10. The continuous slab casting machine according to claim 9, wherein the number of compact heavy segments for the continuous slab casting machine is at least one.