CN111360218B - Straightening machine and billet continuous casting machine - Google Patents

Abstract

The present invention provides a straightening machine and a continuous casting machine for square and round billets. The straightening machine comprises: a straightening machine frame; an upper roller and a lower roller, wherein the lower roller is fixedly arranged at a corresponding position of the straightening machine frame, the upper roller can move relative to the straightening machine frame in a vertical direction, and both the upper roller and the lower roller are flat rollers; a driving device, which can drive the upper roller to rotate; and a pressing device, which is arranged on the straightening machine frame and can drive the upper roller to move downward in a vertical direction. The beneficial effect of the present invention is that by arranging a pressing device and setting both the upper roller and the lower roller as flat rollers, the straightening machine can realize light pressing production of square billets, and at the same time, the flat roller can also be used for normal production of round billets, so as to achieve the purpose of light pressing production of square billet strips and round billet production.

Description

Straightening machine and billet continuous casting machine

Technical Field

The invention relates to the technical field of continuous casting in steel production, and in particular to a straightening machine and a square and round billet continuous casting machine.

Background Art

Some domestic steel mills use square and round billet continuous casting machines for billet production. This casting machine can produce square billets and round billets at the same time. This type of machine generally uses a slotted fixed section and a slotted straightening machine for production, which is beneficial to the ovality of the round billet and prevents the round billet from running off. However, with the improvement of the quality requirements of square billets, the center segregation and looseness of the square billet will seriously affect the performance of the steel and cause a series of quality problems. The billet light reduction technology compensates for the solidification shrinkage of the billet by applying pressure near the end of the liquid core of the continuous casting billet to produce a certain amount of reduction, which can effectively eliminate the purpose of center segregation and looseness. At present, the light reduction technology is widely used in special steel enterprises to produce square billets. When the square billet is lightly reduced, the upper roller presses down the rectangular or square billet to improve the liquid core state of the billet core, so it is the heart of the billet that needs to be pressed down. If the roller is slotted, the slotted part corresponds to the middle of the roller and the heart of the billet. Since the slotted roller cannot touch the middle of the billet, it cannot play the role of pressing down the heart of the billet when pressing down. However, the straightening machines of the square round billet continuous casting machines in the prior art all have slotted structures, which makes it inconvenient to implement light reduction, resulting in the inability to produce high-quality square billets.

Summary of the invention

The invention provides a straightening machine and a square and round billet continuous casting machine, so as to achieve the purpose of realizing the production of square billet strip light reduction technology and the production of round billets.

The technical solution adopted by the present invention to solve its technical problems is: a straightening machine, comprising: a straightening machine frame; an upper roller and a lower roller, the lower roller is fixedly arranged at a corresponding position of the straightening machine frame, the upper roller can move relative to the straightening machine frame in a vertical direction, and the upper roller and the lower roller are both flat rollers; a driving device, which can drive the upper roller to rotate; a pressing device, which is arranged on the straightening machine frame and can drive the upper roller to move downward in a vertical direction.

Furthermore, the pressing device includes a hydraulic cylinder, a displacement sensor and a hydraulic control valve. The driving end of the hydraulic cylinder is connected to the upper roller drive. The displacement sensor and the hydraulic control valve are both arranged on the hydraulic cylinder. The displacement sensor can monitor the displacement of the hydraulic cylinder pressing down, and the hydraulic control valve can monitor the pressure of the hydraulic cylinder pressing down.

Furthermore, the straightening machine also includes: a connecting frame, the upper roller is arranged at the lower position of the connecting frame, a rotatable rotating shaft is arranged at the upper part of the connecting frame, and the driving end of the hydraulic cylinder is drivingly connected to the connecting frame; two gears are symmetrically arranged at both ends of the rotating shaft, and the two gears are integrally arranged with the rotating shaft; two racks are fixedly arranged on the straightening machine frame in the vertical direction, and the two racks are arranged at intervals and are connected with the two gears in a one-to-one correspondence.

Furthermore, the tensioning and straightening machine also includes two side guide rollers fixed on both sides of the tensioning and straightening machine frame, and the two side guide rollers are mirror-imaged relative to the center line connecting the upper roller and the lower roller.

The present invention also provides a square and round billet continuous casting machine, which includes an intermediate tank, an immersed water nozzle, a crystallizer, a crystallizer vibration device, a movable section, a fixed section, a straightening machine, a fire cutting machine and a billet discharge roller table connected in sequence, and the straightening machine is the above-mentioned straightening machine.

Furthermore, the movable section includes: a movable section frame; two inner and outer arc rollers, correspondingly arranged on the inner and outer arc sides of the movable section frame; two side rollers, correspondingly arranged on both sides of the movable section frame, and the two inner and outer arc rollers and the two side rollers together form a space for passing the ingot.

Furthermore, when the square-round billet continuous casting machine is used to produce square billets, the two inner and outer arc rollers are flat rollers; when the square-round billet continuous casting machine is used to produce round billets, the two inner and outer arc rollers are slotted rollers.

Furthermore, the fixed section includes: a fixed section frame; an outer arc roller, which is arranged on the outer arc side of the fixed section frame; and a heat preservation cover, which is arranged on the top of the fixed section frame.

Furthermore, the billet discharge roller table includes: a billet discharge roller table frame; a lower roller of the billet discharge roller table, which is arranged on the billet discharge roller table frame and can abut against the cast billet; a driving device, which is arranged on the billet discharge roller table frame and is drivingly connected to the lower roller of the billet discharge roller table; and a plurality of guide devices, which are arranged on the billet discharge roller table frame, and the plurality of guide devices are symmetrically arranged at both ends of the lower roller of the billet discharge roller table.

Furthermore, the maximum round billet radius of the casting is R, the lower roller of the billet discharge roller is a grooved roller, the groove depth of the lower roller of the billet discharge roller is in the range of 8mm to 18mm, and the groove radius of the lower roller of the billet discharge roller is in the range of R+50mm to R+100mm.

The beneficial effect of the present invention is that by arranging a pressing device and setting both the upper roll and the lower roll as flat rolls, the drawing and straightening machine can realize light pressing production of square billets. At the same time, the flat rolls can also be suitable for normal production of round billets, achieving the purpose of light pressing production of square billet strips and realizing round billet production.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

1 is a schematic structural diagram of a tension and straightening machine according to an embodiment of the present invention;

2 is a schematic structural diagram of a square and round billet continuous casting machine according to an embodiment of the present invention;

3 is a schematic structural diagram of a billet movable section in an embodiment of the present invention;

FIG4 is a schematic structural diagram of a round billet movable section in an embodiment of the present invention;

FIG5 is a schematic structural diagram of a fixed section in an embodiment of the present invention;

FIG. 6 is a schematic diagram of the structure of the blank discharge roller in the embodiment of the present invention.

The reference numerals in the figure are as follows: 1. intermediate tank; 2. immersed water inlet; 3. crystallizer; 4. crystallizer vibration device; 5. movable section; 501. movable section frame; 502. inner and outer arc rollers; 503. side rollers; 6. ingot; 7. fixed section; 701. fixed section frame; 702. outer arc roller; 703. insulation cover; 8. straightening machine; 801. straightening machine frame; 802. lower roller; 803. upper roller; 804. pressing device; 805. driving device; 806. side guide roller; 9. fire cutting machine; 10. billet discharge roller; 1001. billet discharge roller frame; 1002. billet discharge roller lower roller; 1003. guiding device; 1004. billet discharge roller driving device.

DETAILED DESCRIPTION

It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

As shown in FIG1 , an embodiment of the present invention provides a straightening machine, comprising a straightening machine frame 801, an upper roller 803 and a lower roller 802, a driving device 805 and a pressing device 804. The lower roller 802 is fixedly arranged at a corresponding position of the straightening machine frame 801, the upper roller 803 can move relative to the straightening machine frame 801 in a vertical direction, and both the upper roller 803 and the lower roller 802 are flat rollers; the driving device 805 can drive the upper roller 803 to rotate. The pressing device 804 is arranged on the straightening machine frame 801 and can drive the upper roller 803 to move downward in a vertical direction.

Setting a pressing device 804 and setting both the upper roller 803 and the lower roller 802 as flat rollers can enable the straightening machine to achieve light pressing production of square billets. At the same time, the flat rollers can also be used for normal production of round billets, achieving the purpose of light pressing production of square billet strips and round billet production.

Specifically, the pressing device 804 includes a hydraulic cylinder, a displacement sensor and a hydraulic control valve. The driving end of the hydraulic cylinder is connected to the upper roller 803. The displacement sensor and the hydraulic control valve are both arranged on the hydraulic cylinder. The displacement sensor can monitor the displacement of the hydraulic cylinder, and the hydraulic control valve can monitor the pressure of the hydraulic cylinder.

The displacement sensor and hydraulic control valve are set to control the telescopic displacement and pressure of the hydraulic cylinder, which is convenient for accurately controlling the pressure of the straightening machine and can realize the control of ovality during round billet production.

The tensioning and straightening machine in the embodiment of the present invention further includes:

A connecting frame, wherein the upper roller 803 is arranged at the lower part of the connecting frame, a rotating shaft capable of rotating is arranged at the upper part of the connecting frame, and a driving end of the hydraulic cylinder is drivingly connected to the connecting frame;

Two gears are symmetrically arranged at both ends of the rotating shaft, and the two gears are integrally arranged with the rotating shaft;

Two racks are fixedly arranged on the straightening machine frame 801 along the vertical direction. The two racks are arranged at intervals and are connected with the two gears in a one-to-one corresponding manner.

By setting gears and racks, it is possible to prevent the two sides of the upper roller 803 from being non-parallel when pressing down, that is, to prevent the left and right sides of the upper roller 803 from descending asynchronously, causing the upper roller 803 and the lower roller 802 to be non-parallel, and to avoid the casting billet 6 from forming a wedge shape, effectively reducing the deviation of the round billet and the poor quality of the square billet when lightly pressed down.

The straightening machine further includes two side guide rollers 806 fixed on both sides of the straightening machine frame 801, and the two side guide rollers 806 are mirror-set relative to the center line of the upper roller 803 and the lower roller 802. The side guide rollers 806 can guide the ingot 6 to prevent the ingot 6 from running off.

As shown in Figures 2 to 6, an embodiment of the present invention also provides a square and round billet continuous casting machine, which includes an intermediate tank 1, an immersed water inlet 2, a crystallizer 3, a crystallizer vibration device 4, a movable section 5, a fixed section 7, a straightening machine 8, a fire cutting machine 9 and a billet discharge roller 10 connected in sequence, and the straightening machine 8 is the above-mentioned straightening machine.

Specifically, as shown in Figures 3 and 4, the movable section 5 includes a movable section frame 501, two inner and outer arc rollers 502 and two side rollers 503. The two inner and outer arc rollers 502 are correspondingly arranged on the inner arc side and the outer arc side of the movable section frame 501. The two side rollers 503 are correspondingly arranged on both sides of the movable section frame 501, and the two inner and outer arc rollers 502 and the two side rollers 503 together enclose a space for passing the casting billet 6.

The two inner and outer arc rollers 502 and the two side rollers 503 together form multiple rows of four-sided clamping rollers, which can support and guide the cast billet 6.

In the embodiment of the present invention, the structure of the movable section 5 is slightly different when producing square billets and round billets, as follows: when the square billet continuous casting machine is used to produce square billets, the two inner and outer arc rollers 502 are flat rollers. When the square billet continuous casting machine is used to produce round billets, the two inner and outer arc rollers 502 are slotted rollers. The slotting depth of the slotted rollers is 3 mm to 8 mm.

It should be noted that the basic arc radius of all equipment for square billets and round billets is 12000mm-18000mm, and the groove radius of the round billet crystallizer and the movable section 5 is 12000mm-18000mm, and the two values are consistent.

As shown in FIG5 , in the embodiment of the present invention, the fixed section 7 includes a fixed section frame 701, an outer arc roller 702 and a heat preservation cover 703. The outer arc roller 702 is arranged on the outer arc side of the fixed section frame 701. The heat preservation cover 703 is arranged on the top of the fixed section frame 701. The outer arc roller 702 is a flat roller, which is universal for both square billets and round billets, and the heat preservation cover 703 can keep the cast billet 6 at the fixed section frame 701 warm.

As shown in FIG6 , in the embodiment of the present invention, the billet discharge roller 10 comprises a billet discharge roller frame 1001, a billet discharge roller lower roller 1002, a billet discharge roller drive device 1004 and a plurality of guide devices 1003. The billet discharge roller lower roller 1002 is arranged on the billet discharge roller frame 1001 and can abut against the cast billet 6. The billet discharge roller drive device 1004 is arranged on the billet discharge roller frame 1001 and is drivingly connected to the billet discharge roller lower roller 1002. A plurality of guide devices 1003 are arranged on the billet discharge roller frame 1001, and the plurality of guide devices 1003 are symmetrically arranged at both ends of the billet discharge roller lower roller 1002.

Furthermore, the maximum round billet radius of the billet 6 is R, the lower roller 1002 of the billet roller is a slotted roller, the slot depth of the lower roller 1002 of the billet roller is in the range of 8mm to 18mm, and the slot radius of the lower roller 1002 of the billet roller is in the range of R+50mm to R+100mm, where the unit of R is millimeter. The roller surface elevation of the billet roller 10 is consistent with the roller surface height of the straightening machine 8 to ensure that the roller height is consistent when the square billet is running. The guide device 1003 can guide the round billet and can also be used for guiding the square billet. The cross section of the square billet is 240×240mm to 430×550mm, and the cross section of the round billet is Φ250mm to Φ1000mm.

It should be noted that the embodiment of the present invention includes a plurality of straightening machines 8 arranged in sequence, wherein the first straightening machine 8 and the last straightening machine 8 are both provided with side guide rollers 806, which can also be used to prevent the round billet from deviating.

From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: a down-pressing device 804 is set and both the upper roller 803 and the lower roller 802 are set as flat rollers, so that the straightening machine can realize light down-pressing production of square billets, and at the same time, the flat rollers can also be suitable for the normal production of round billets, so as to achieve the purpose of light down-pressing production of square billets and round billet production.

The above is only a specific embodiment of the present invention, and cannot be used to limit the scope of the invention. Therefore, the replacement of equivalent components, or equivalent changes and modifications made according to the protection scope of the present invention, should still fall within the scope of this patent. In addition, the technical features of the present invention can be freely combined with each other, with each other, and with each other.

Claims (3)

1. A square and round billet continuous casting machine, comprising a tundish (1), an immersion nozzle (2), a crystallizer (3), a crystallizer vibration device (4), a movable section (5), a fixed section (7), a straightening machine (8), a fire cutting machine (9) and a billet discharge roller table (10) connected in sequence, wherein the square and round billet continuous casting machine is used for the production of square billets and round billets at the same time, and is characterized in that the straightening machine (8) comprises: Straightening machine frame (801); An upper roller (803) and a lower roller (802), wherein the lower roller (802) is fixedly arranged at a corresponding position of a straightening machine frame (801), the upper roller (803) is movable in a vertical direction relative to the straightening machine frame (801), and both the upper roller (803) and the lower roller (802) are flat rollers; A driving device (805) capable of driving the upper roller (803) to rotate; A pressing device (804) is arranged on the tension and leveling machine frame (801) and is capable of driving the upper roller (803) to move downward in a vertical direction; The pressing device (804) comprises a hydraulic cylinder, a displacement sensor and a hydraulic control valve, the driving end of the hydraulic cylinder is drivingly connected to the upper roller (803), the displacement sensor and the hydraulic control valve are both arranged on the hydraulic cylinder, the displacement sensor can monitor the displacement of the hydraulic cylinder when pressing downward, and the hydraulic control valve can monitor the pressure of the hydraulic cylinder when pressing downward; The tensioning and straightening machine (8) further comprises: A connecting frame, the upper roller (803) is arranged at a lower position of the connecting frame, a rotatable rotating shaft is arranged at the upper portion of the connecting frame, and the driving end of the hydraulic cylinder is drivingly connected to the connecting frame; Two gears are symmetrically arranged at two ends of the rotating shaft, and the two gears are integrally arranged with the rotating shaft; Two racks are fixedly arranged on the straightening machine frame (801) in the vertical direction, the two racks are arranged at intervals and are connected to the two gears in a one-to-one matching manner; The straightening machine (8) further comprises two side guide rollers (806) fixed on both sides of the straightening machine frame (801), and the two side guide rollers (806) are arranged in a mirror image relative to a center line connecting the upper roller (803) and the lower roller (802); The activity section (5) comprises: ActiveSegmentFrame(501); Two inner and outer arc rollers (502) are correspondingly arranged on the inner arc side and the outer arc side of the movable segment frame (501); Two side rollers (503) are correspondingly arranged on both sides of the movable section frame (501), and the two inner and outer arc rollers (502) and the two side rollers (503) together enclose a space for the casting blank (6) to pass through; When the square-round billet continuous casting machine is used to produce square billets, the two inner and outer arc rollers (502) are both flat rollers; When the square round billet continuous casting machine is used to produce round billets, the two inner and outer arc rollers (502) are both slotted rollers; The fixing section (7) comprises: Fixed segment frame (701); An outer arc roller (702) is arranged on the outer arc side of the fixed segment frame (701); A heat-insulating cover (703) is arranged on the top of the fixed section frame (701). 2. The square and round billet continuous casting machine according to claim 1, characterized in that the billet discharge roller table (10) comprises: Billet discharge roller frame (1001); A lower roller (1002) of the billet discharge roller table, arranged on the billet discharge roller table frame (1001) and capable of abutting against the cast billet (6); A billet discharge roller drive device (1004), arranged on the billet discharge roller frame (1001) and drivingly connected to the billet discharge roller lower roller (1002); A plurality of guide devices (1003) are arranged on the blank discharge roller frame (1001), and the plurality of guide devices (1003) are symmetrically arranged at two ends of the lower roller (1002) of the blank discharge roller. 3. The square and round billet continuous casting machine according to claim 2 is characterized in that the maximum round billet radius of the cast billet (6) is R, the lower roller (1002) of the billet discharge roller is a grooved roller, the groove depth of the lower roller (1002) of the billet discharge roller is in the range of 8mm~18mm, and the groove radius of the lower roller (1002) of the billet discharge roller is in the range of R+50mm~R+100mm.