KR100638834B1 - Active crown controllable leveller - Google Patents

Abstract

The present invention relates to a rolling line straightener of a new structure to be able to control the crown in real time according to the specifications of the rolled steel sheet and the load state of the work roll.

According to the invention, the main body 8, which consists of the lower frame 2, the strut 4 and the upper frame 6, and the lower part of the upper frame 6 of the lower frame 2 of the main body 8, respectively. A lower roll carriage 10 and an upper roll carriage 12 to be mounted, a lower work roll 14 and a lower backup roll 16 to be mounted to the lower roll carriage 10, and the upper roll carriage 12. The upper work roll 18 and the upper backup roll 20 to be mounted on the straightening of the rolling line including a main cylinder 22 disposed on the upper frame 6 to press the upper frame 6 downward The sensor bracket 24 is disposed between the frames 2 and 6 and the roll carriages 10 and 12 so as to be spaced apart from the frames 2 and 6, and the work roll 14 is connected to the sensor bracket 24. 18 is disposed along the longitudinal direction of the plurality of dynamic cylinders 26 for pressing the roll carriages 10 and 12, and between the sensor brackets 24 and the frames 2 and 6, 24) Gap sensors 28 and 30 for measuring the gap change between each part and the frames 2 and 6, Stroke sensor 32 for detecting the stroke amount of the dynamic cylinder 26, and Gap sensors 28 and 30. And a controller for dynamic crown control including a controller 34 for controlling the operation of the dynamic cylinder 26 according to the detection signal of the stroke sensor 32 is provided.

Crown, Control, Dynamic Cylinder, Stroke Sensor, Gap Sensor

Description

Rolling line straightener with dynamic crown control {Active crown controllable leveller}

1 is a front configuration diagram showing a rolling line straightener according to the present invention

2 is a side configuration diagram of the calibrator

3 is an enlarged view of a portion A of FIG. 1 enlarged;

4 is an enlarged view illustrating B of FIG. 2 enlarged.

<Description of the symbols for the main parts of the drawings>

2. Lower frame 4. Shore 6. Upper frame

8. Main body 10. Lower roll carriage 12. Upper roll carriage

14. Lower work roll 16. Lower backup roll 18. Upper work roll

20. Upper backup roll 22. Main cylinder 24. Sensor bracket

26. Dynamic cylinders 28, 30. Gap Sensor 32. Stroke Sensor

34. Controller

The present invention relates to a rolling line straightener capable of dynamic crown control, and more particularly, to a rolling line straightener of a new structure that enables crown control in real time according to the specifications of a rolled steel sheet and load state of a work roll. will be.

The leveler of the rolling line is a steelmaking facility which is disposed at the rear end of the heating furnace and the rolling mill and primarily corrects the steel sheet whose flatness obtained through the rolling mill is not uniform.

Such a straightener is provided with a plurality of upper and lower work rolls along the advancing direction of the steel plate, which is a workpiece, between the lower frame and the upper frame which is mounted on the upper side of the lower frame so as to be elevated and lowered by the main cylinder. Pressing the upper and lower surfaces of the steel sheet passing between the upper and lower work rolls to straighten the steel sheet, and elevating the upper frame and the upper work rolls with the main cylinder to raise and lower the upper and lower work rolls, and the upper and lower work rolls. It is configured to adjust the pressure to pressurize the steel sheet.

However, such a straightener is connected to both the upper and lower frames of the work roll, when pressing the upper work roll down with the main cylinder, since only the both ends of the work roll is pressed downward, it is possible to straighten the steel plate When the middle part of the work roll is pushed upward and downward, an unbalance, that is, a crown phenomenon occurs, in which the steel sheets being processed are relatively thin in both width directions and protrude convexly in the center part.

Therefore, conventionally, the upper and lower backup rolls are disposed on the outer side of the upper and lower work rolls to support the upper and lower side surfaces of the work rolls, and a wedge-shaped taper liner is mounted on the outer sides of the work rolls and the backup rolls. This prevents the central portion of the work roll from being pushed outward. In this case, the upper and lower work rolls and the upper and lower backup rolls are mounted on upper and lower roll carriages provided on adjacent sides of the upper and lower frames, and the taper liner is disposed between the upper and lower roll carriages and the upper and lower frames. It fits into a wedge shape. Therefore, by pressing the roll carriage forward and backward with the taper liner using a driving device, it is possible to prevent the crown phenomenon from occurring by applying a reverse crown deformation to the work roll.

However, the crown straightening method by the taper liner of the straightener of the conventional rolling line artificially adds an inverse crown deformation to offset the crown deformation value according to data such as the thickness and material of the steel sheet introduced based on experience in advance. Therefore, even if the deviation occurs in various conditions such as the specification and state of the steel sheet actually introduced, even if the actual crown deformation is different from the expected value, only a predetermined inverse crown deformation can be applied, so that the working conditions can be quickly and flexibly modified. There is a problem that can not be.

In addition, the taper-liner crown correction method is difficult to adjust the horizontal position in the state where the pressure is applied by the main cylinder, so that before the pressure is applied by the main cylinder, that is, before the steel sheet is put into the straightener, Since front and rear positions should be adjusted, the working conditions cannot be modified quickly according to the working condition or steel deformation state in real time after the steel sheet is put in place. There is a problem that it cannot be sufficiently satisfied.

The present invention has been proposed in view of the problems of the conventional straightener of the rolling line as described above, the present invention has a simple structure, so that the crown can be controlled in real time according to the specifications of the rolled steel sheet and the load state of the work roll It is to provide a rolling line straightener with a new structure.

According to the invention, the main body 8, which consists of the lower frame 2, the strut 4 and the upper frame 6, and the lower part of the upper frame 6 of the lower frame 2 of the main body 8, respectively. A lower roll carriage 10 and an upper roll carriage 12 to be mounted, a lower work roll 14 and a lower backup roll 16 to be mounted to the lower roll carriage 10, and the upper roll carriage 12. The upper work roll 18 and the upper backup roll 20 to be mounted on the straightening of the rolling line including a main cylinder 22 disposed on the upper frame 6 to press the upper frame 6 downward The sensor bracket 24 is disposed between the frames 2 and 6 and the roll carriages 10 and 12 so as to be spaced apart from the frames 2 and 6, and the work roll 14 is connected to the sensor bracket 24. 18 are disposed along the lengthwise direction of the plurality of dynamic cylinders 26 for pressing the roll carriages 10 and 12, and are provided between the sensor brackets 24 and the frames 2 and 6. (24) Gap sensors 28 and 30 for measuring the gap change between the respective parts and the frames 2 and 6, a stroke sensor 32 for detecting the stroke amount of the dynamic cylinder 26, and the gap sensors 28, 30) and a controller of the rolling line capable of dynamic crown control is provided, including a controller 34 for controlling the operation of the dynamic cylinder 26 according to the detection signal of the stroke sensor 32.

According to another feature of the invention, the sensor bracket 24 is formed long along the longitudinal direction of the work roll (14, 18), the longitudinal front and rear end is freely movable in the frame (2, 6) Is connected so that, the sensor bracket 24 is provided with a straightener of the rolling line capable of dynamic crown control, characterized in that it can be deformed in accordance with the deformation of the upper work roll 18 and the upper backup roll 20. .

According to another feature of the present invention, the sensor bracket 24 has a dynamic crown control, characterized in that the longitudinal front and rear end is connected to the frame (2, 6) by the link member 38 to be freely movable. Straighteners of possible rolling lines are provided.

Hereinafter, with reference to the drawings will be described a preferred embodiment of the present invention. 1 to 4 illustrate a straightener of a rolling line capable of dynamic crown control according to the present invention, the main body 8 consisting of a lower frame 2, a strut 4 and an upper frame 6, and the main body. A lower roll carriage 10 and an upper roll carriage 12 respectively mounted on an upper portion of the lower frame 2 and a lower portion of the upper frame 6 of the lower frame 8 of the lower frame 2, and a lower workpiece mounted on the lower roll carriage 10; A roll 14 and a lower backup roll 16, an upper work roll 18 and an upper backup roll 20 mounted on the upper roll carriage 12, and an upper portion of the upper frame 6; It is the same as the conventional one including the main cylinder 22 which is installed on the left and right and front and rear four parts of the direction to press the upper frame 6 downward.

The calibrator includes a sensor bracket 24 disposed between the upper and lower frames 2 and 6 and the upper and lower roll carriages 10 and 12, and a work roll 14 on the sensor bracket 24. 18 is disposed along the longitudinal direction of the plurality of dynamic cylinders 26 for pressing the roll carriages 10 and 12, and between the sensor brackets 24 and the frames 2 and 6, Gap sensors 28 and 30 for measuring the gap change between the respective portions of the frame 24 and the frames 2 and 6, a stroke sensor 32 for detecting the stroke amount of the dynamic cylinder 26, and the gap sensor A controller 34 is further provided to control the operation of the dynamic cylinder 26 according to the detection signals 28 and 30 and the stroke sensor 32.

3 and 4 illustrate the configuration of the sensor bracket 24, the dynamic cylinder 26, the gap sensors 28 and 30, the stroke sensor 32, and the controller 34 provided in the upper frame 6. The sensor bracket 24 is composed of a metal block long in the longitudinal direction of the work rolls 14 and 18, and the longitudinal front and rear ends thereof are freely connected to the upper frame 6. That is, both ends of the upper surface of the sensor bracket 24 are seated on a seating portion 36 formed concave on the lower surface of the upper frame 6, and the link members 38 provided at both ends of the upper surface of the upper frame ( 6 is hinged to the fixed block 40 provided in, so that the sensor bracket 24 is configured to be deformed in the same shape to follow the deformation of the upper work roll 18 and the upper backup roll (20).

In addition, the dynamic cylinder 26 provided on the bottom surface of the sensor bracket 24 is disposed in two rows along the longitudinal direction of the upper work roll 18 on the bottom surface of the sensor bracket 24, and is mounted therein. The end of the ram 42 protrudes downward to be in close contact with the upper surface of the upper roll carriage 12, so that the ram 42 presses the upper roll carriage 12 downward during operation. In addition, the sensor bracket 24 and the upper frame 6 are provided with a plurality of gap sensors 28 and 30 and stroke sensors 32. The gap sensors 28 and 30 are provided on the upper surface of the sensor bracket 24, the sensor pin 28 and the sensor frame 28 is provided on the upper frame 6 and the upper end of the sensor pin (28) ( 30, each gap sensor (28, 30) is installed to correspond to the center position of each dynamic cylinder 26, the sensor bracket 24 is deformed when the sensor pin 28 is elevated, the The sensor block 30 senses the distance at which the sensor pin 28 is lifted and measures and outputs the amount of change in the gap between each part of the sensor bracket 24 and the upper frame 6. The stroke sensor 32 is a sensing rod 48 provided on one side penetrates through the sensor bracket 24 from the upper side to the lower side and contacts the ram 42 of the dynamic cylinder 26 so that the ram 42 is elevated. It is configured to sense and output the distance, ie the stroke of the dynamic cylinder 26.

In addition, a controller 34 for operating the dynamic cylinder 26 is connected to the gap sensors 28 and 30 and the stroke sensor 32. The controller 34 operates the dynamic cylinder 26 by the gap change amount when the gap change amount of the space between the sensor bracket 24 and the upper frame 6 is output by the gap sensors 28 and 30. In response to the operation amount signal of the dynamic cylinder 26 output from the upper stroke sensor 32, the gap change amount output from the gap sensors 28 and 30 and the stroke amount output from the stroke sensor 32 are repeatedly checked. Function. At this time, the configuration of the sensor bracket 24, the dynamic cylinder 26, the gap sensor 28, 30 and the stroke sensor 32 described above, as shown in Figs. 1 and 2, the arrangement order is changed up and down The same is also provided between the lower frame 2 and the lower roll carriage 10.

The operation of the calibrator configured as described above is as follows.

First, when a steel plate is inserted between the upper and lower work rolls 14 and 18 and a crown phenomenon occurs during calibration, and the work rolls 14 and 18 are deformed, the upper and lower backup rolls are followed. The upper and lower roll carriages and the sensor bracket 24 are also deformed. In addition, when the gap sensors 28 and 30 measure a gap change amount of the space between the respective parts of the sensor bracket 24 and the upper and lower frames 2 and 6 and output the measured gap change amount, the controller 34 determines the gap. In response to the signals of the gap sensors 28 and 30, the dynamic cylinder 26 is actuated to press the roll carriages 10 and 12 so that an inverse crown deformation opposite to the crown phenomenon is applied to the work rolls 14 and 18. This cancels the crown phenomenon. At this time, the stroke amount that the dynamic cylinder 26 presses the roll carriage is measured by the stroke sensor 32 is fed back to the controller 34, the controller 34 is a signal of the gap sensor (28, 30) And the signal of the stroke sensor 32 are continuously compared until the amount of change in the gap between the space between the sensor bracket 24 and the upper and lower frames 2 and 6 and the stroke amount of the dynamic cylinder 26 are equal. The dynamic cylinder 26 is operated to apply reverse crown deformation to the work rolls 14 and 18 so that the crown phenomenon is completely canceled out.

When the crown phenomenon occurs, the sensor bracket 24 is deformed following the deformation of the work rolls 14 and 18, and the deformation of the sensor bracket 24 is gap. Sensors 28 and 30 may detect in real time and apply reverse crown deformation. Therefore, unlike the conventional calibrator which initially estimates the crown generation amount and applies the reverse crown deformation in advance, since the reverse crown deformation can be applied in real time according to the crown generation amount, there is an advantage of effectively canceling the crown phenomenon.

In addition, by using the gap sensor 28, 30 and the stroke sensor 32, as well as automatically adjust the pressure of the dynamic cylinder 26 while feeding back the offset state of the crown effect, the sensor bracket 24 of the Since both ends are connected to the upper and lower frames 2 by the link members 38 and freely move, the gap sensors 28 and 30 are faithfully followed by deformation of the work rolls 14 and 18 when the crown phenomenon occurs. By accurately reflecting the deformation degree of the work roll (14, 18), there is an advantage that accurate crown phenomenon control is possible.

According to the present invention, the respective parts of the sensor bracket 24, the dynamic cylinder 26, the sensor bracket 24 between the upper and lower frames 2 and 6 and the upper and lower roll carriages 10 and 12. Gap sensors 28 and 30 for measuring a change in gap between the frame 2 and 6, a stroke sensor 32 for detecting the stroke amount of the dynamic cylinder 26, and the gap sensors 28 and 30; Controller 34 for controlling the operation of the dynamic cylinder 26 in accordance with the detection signal of the stroke sensor 32, it is possible to control the crown in real time according to the specifications of the rolled steel sheet and the load state of the work roll It is possible to provide a new structure of a rolling line straightener.

Claims (3)

A lower roll carriage mounted on the lower part of the upper frame 6 of the lower frame 2, the support frame 4 and the upper frame 6, and the lower frame 2 of the lower frame 2 of the main body 8, respectively. 10 and the upper roll carriage 12, the lower work roll 14 and the lower backup roll 16 mounted on the lower roll carriage 10, and the upper work roll mounted on the upper roll carriage 12 In the straightener of the rolling line comprising an 18 and the upper backup roll 20, and the main cylinder 22 which is disposed on the upper frame 6 and presses the upper frame 6 downward, the frame ( A sensor bracket 24 disposed between the 2 and 6 and the roll carriages 10 and 12 so as to be spaced apart from the frames 2 and 6, and the length of the work rolls 14 and 18 in the sensor bracket 24 Disposed along the plurality of dynamic cylinders 26 for pressing the roll carriages 10 and 12, and between the sensor brackets 24 and the frames 2 and 6, each part of the sensor brackets 24. And frame Gap sensors 28 and 30 for measuring the gap change between (2, 6), Stroke sensor 32 for detecting the stroke amount of the dynamic cylinder 26, The gap sensors 28 and 30 and the stroke And a controller (34) for controlling the operation of the dynamic cylinder (26) according to the detection signal of the sensor (32). 2. The sensor bracket (24) according to claim 1, wherein the sensor bracket (24) is elongated along the longitudinal direction of the work rolls (14, 18), and the longitudinal front and rear ends thereof are freely movable in the frames (2, 6). Is connected, so that the sensor bracket (24) can be deformed in accordance with the deformation of the upper work roll (18) and the upper back-up roll (20), the crown of the dynamic line control capable of dynamic crown control. The rolling line capable of dynamic crown control according to claim 2, wherein the sensor bracket 24 has a longitudinal front and rear end connected to the frames 2 and 6 by a link member 38 to enable free movement. Braces.

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