KR20020049894A - apparatus for arranging strip center in strip caster - Google Patents

Abstract

PURPOSE: An apparatus for correcting skewness of a strip in a strip caster is provided which is improved to control tension of the strip as correcting the strip so that skewness is not generated on the center of the strip and rolled in the strip caster. CONSTITUTION: In an apparatus for correcting skewness which is generated as a strip continuously passing through a rolling mill after being cast in a strip caster is being proceeded in a direction on a roller table, the apparatus for correcting skewness of the strip in the strip caster comprises first and second lower rolls(10,20) which are idle driven with the outer circumferential surface of the first and second lower rolls(10,20) being contacted with the lower surface of the strip proceeding in a direction, and which are installed on a lower frame(15) in a width direction of the strip; an upper roll(30) which is idle driven with the outer circumferential surface of the upper roll(30) being contacted with the upper surface of the strip when the upper roll(30) is descending operated; cylinder members(40a,40b) installed at an upper frame(17), wherein the cylinder members(40a,40b) vertically ascends or descends a bearing block rotationally supporting both ends of the upper roll(30); and photo sensors(50a,50b) descending the cylinder members(40a,40b) during generation of skewness by sensing left and right edge parts of the strip passing on the first and second lower rolls(10,20).

Description

Apparatus for arranging strip center in strip caster}

The present invention relates to a thin plate meander correcting apparatus of a thin plate casting machine which can be adjusted to adjust the thin plate tension while correctly correcting the center of the thin plate that is cast and rolled in the thin plate casting machine to prevent meandering.

In general, a twin roll sheet casting machine supplies molten steel through a pair of molten steel-filled tundish to a pair of casting rolls that are water-cooled, and at the same time rotates the casting rolls. After coalescing to continuously produce a cast of about 1 to 6 mm in thickness, and then cast the thin plate by passing the cast through a rolling mill consisting of upper and lower rolls.

Then, at the rear end of the rolling mill is provided with a roller table for guiding the cast slab to be rolled to the exit side of the thin plate rolled to a desired thickness, various operations are performed in such a roller table.

Such a roller table usually includes a spray device for cooling the rolled sheet, a device for tensioning the sheet, a device for preventing meandering occurring when the sheet proceeds in one direction to the coiler, and a device for removing scales attached to the sheet surface. A device for measuring the thickness of the thin plate may be installed.

However, in order for these devices to work properly, the sheet must proceed to the coiler without meandering on the roller table to one side. The meandering of the sheet occurs at an unknown position due to various conditions. In order to prevent the meandering occurred during the thin plate progression by mounting a CPC (center position controll) device, it is difficult to correct the meandering when the roller table on which the thin plate is advanced is long.

That is, if the CPC device is installed in the center of the entire length of the roller table in which the thin plate proceeds, the meandering of the thin plate traveling forward and backward of the position where the CPC device is installed can be corrected, but in the area where the device cannot correct the meandering, the thin plate meandering is performed. There is a problem in that the installation cost is excessive because it is necessary to install another CPC device to prevent this.

As a result, conventionally, a guiding plate or a guide roll is mounted on the roller table to align the thin plates to correct the meandering. However, in most countries of the sheet casting machine, a CPC device or an edge position controll (EPC) is used. A device is used to control the meandering of the sheet.

Here, the mechanism for correcting the meandering in the CPC device or the EPC device as described above is a trapezoidal four-section link, a sensor for detecting the position of the thin plate, a hydraulic cylinder for moving the trimming link, and a hydraulic cylinder for pinching the slabs. And the like. And the operation calculates the position of the thin plate detected by the sensor and sends a signal to the hydraulic cylinder to adjust the four-section link, the roll is tilted in the pinch state of the thin plate to correct the meandering thin plate correctly will be.

This mechanism corrects the thin plate slant at the rear by holding one of the front and rear sides, and this also has a problem in operating the device that cannot be adjusted when it exceeds the adjustment range.

Accordingly, the present invention has been made to solve the above problems, the purpose is to easily correct the meandering of the flakes proceeding on the roller table after rolling, and at the same time can adjust the tension of the thin plate, the installation cost and operating cost It is to provide a thin plate meander correction device of the sheet casting machine that can be saved.

1 is a front view showing a thin plate meander correction apparatus of the sheet casting machine according to the present invention,

Figure 2 is a side view showing a thin plate meander correction apparatus of the sheet casting machine according to the present invention,

Figure 3 is a front view showing a roll member employed in the thin plate meander correction apparatus of the thin sheet casting machine according to the present invention,

Figure 4 (a) (b) (c) is a working state diagram showing the thin plate meandering device of the sheet casting machine according to the present invention.

Explanation of symbols on the main parts of the drawings

2a, 2b Slope 15,17 Upper and lower frames

10,20 ... 1st, 2nd lower roll 30 .... upper roll

40a, 40b ... Cylinder member 50a, 50b ... Optical sensor

90 ... roller table 95 .... guide roller

As a technical configuration for achieving the above object, the present invention

In the apparatus for correcting the meandering occurred while the cast slab cast in the sheet casting machine continuously passes through the rolling mill on the roller table,

The first and second lower rolls which are driven in contact with the lower plate bottom surface and the outer circumferential surface advancing in one direction are provided in the width direction of the thin plate on the lower frame, respectively, and are located between the first and second lower rolls, The upper frame is provided with an upper roll which is in contact with a surface and an outer circumferential surface and is driven idlely, and a cylinder member for raising and lowering a bearing block for rotatably supporting the left and right ends of the upper roll up and down, By detecting the left and right edges of the sheet passing through the thin plate meandering device of the sheet caster, characterized in that it comprises an optical sensor for lowering the cylinder member when the meander occurs.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a front view showing a thin plate meander correction apparatus of a thin plate casting machine according to the present invention, Figure 2 is a side view showing a thin plate meander correction apparatus of a thin plate casting machine according to the present invention, Figure 3 is a As a front view showing a roll member employed in the thin plate meander correcting device, the apparatus 100 of the present invention, as shown in Figs. 1 to 3, the rolled sheet through the rolling mill after casting is formed on the roller table 90 As it is installed in the middle of the length of the roller table 90 so that the right or left meandering of the thin plate generated during one-way progress can be easily corrected by using the contact surface difference between the outer surface of the roll and the thin plate, and the tension of the thin plate can be adjusted. The apparatus 100 is composed of first and second lower rolls 10 and 20, upper rolls 30, cylinder members 40a and 40b, and optical sensors 50a and 50b.

That is, the first and second lower rolls 10 and 20 respectively fix the bearing blocks 11 and 21 at both ends on the lower frame 15 fixed to the bottom surface, and proceed with the thin plate. It is installed in the width direction of the thin plate in the middle of the length of the roller table 90 having a plurality of guide rolls 95 to guide in one direction. Accordingly, the first and second lower rolls 10 and 20 are driven in contact with each other by a thin plate bottom surface and its outer circumferential surface running in one direction, and the first and second lower rolls 10 and 20 and the guide roll ( 95 is disposed on the same horizontal line.

The upper roll 30 is disposed at a position between the first and second lower rolls 10 and 20, and is a roll member that is in contact with the upper surface and the outer circumferential surface of the thin plate during the lowering operation and is idle driven. Bearing blocks 31 rotatably supporting the left and right ends of the upper roll 30 are respectively mounted to the rod ends of the cylinder members 40a and 40b that are fixed to the left and right ends of the upper frame 17, respectively.

Here, the upper frame 18 is firmly connected to the lower frame 15 via the intermediate frame 18.

In addition, the left and right pairs of optical sensors to detect the left and right edges of the thin plate running in one direction on the top of the first and second lower rolls 10 and 20 at the front end of the upper frame 18. 50a and 50b, and the optical sensors 50a and 50b are mounted to the cylinder members 40a and 40b by lowering the rod end by transmitting a signal generated by sensing the thin plate when it is in a meandering event. The upper roll 30 is in close contact with the upper surface of the thin plate.

Here, the optical sensors (50a) (50b) is a CCD (Charge Coupled Device) for observing whether the edge portion of the thin plate is out of comparison with the observed value set to the left or right, and converts the state that the thin plate is meandering into a digital signal Equipped with a camera, it is preferable to be mounted on the tip of the upper frame 17 so that the right and left installation width can be appropriately widened or narrowed according to the width of the rolled thin plate.

The upper and lower rolls 10, 20, and 30 are as shown in Fig. 3, so as to generate a velocity vector to move toward a larger number of contacts due to the difference in contact area when contacting the thin plate that proceeds in one direction. Inclined portions 2 each having an inclined gradient of 1:12 or 1:15 are formed at left and right ends thereof, and each inclined portion 2 has a length of 1.5 to 1.8 times that of the thin plate. Configure it to have a length of about 4.

The operation and effects of the present invention having the configuration as described above will be described.

First, the cast steel cast in the sheet caster is made to roll to a certain thickness while passing through the rolling mill, the rolled sheet is to proceed in one direction by riding the roller table 90 to the coiler winding the sheet in the form of a coil, The thin plate that proceeded in one direction has lower surfaces on the outer surfaces of the first and second lower rolls 10 and 20 provided in the middle of the length of the roller table 90, so that the first and second lower rolls 10 ( 20) proceeds in one direction while idling.

At this time, if the edges of the left and right ends of the thin plate observed by the optical sensors 50a and 50b mounted on the left and right sides of the front end of the upper frame 17 are within the observation range, the thin plate proceeds smoothly without meandering. It is judged that the upper roll 30 mounted on the cylinder members 40a and 40b is disposed as it is.

On the other hand, of the left and right edge portions of the thin plate observed by the light sensors 50a and 50b, as shown in FIG. 4 (b), the left light sensor 50a of the upper frame 17 is turned to the left side. When the observation amount of the thin plate edge portion measured at and increases, and the observation amount of the thin plate edge portion measured at the right optical sensor 50b decreases, the optical sensors 50a and 50b determine that the meandering of the thin plate is generated to signal a signal. And the generated signal is transmitted to the cylinder members 40a and 40b to lower the rod end so that the upper roll 30 mounted thereon is in close contact with the upper surface of the thin plate which is meandered to the left.

In this case, the upper roll 30 having the inclined portions 2a and 2b on both the left and right ends is driven idle while generating a frictional force on the contact portion while being pressed against the thin plate-like surface running in one direction. At the same time, the first and second lower rolls 10 and 20 are also driven to rotate while generating frictional force at a portion contacting the lower surface of the thin plate.

At this time, the left edge portion of the thin plate slanted to the left is moved toward the inclined portion 2a to reduce the contact area with the outer surface of the roll, whereas the right edge portion opposite to the roll side has a relative contact area with the outer surface of the roll. It becomes wider. That is, since the contact area between the upper surface of the thin plate moved to the left inclined portion 2a side and the contact area between the upper surface of the thin plate and the roll on the opposite side is wider than the contact area between the roll and the left and right sides of the thin plate, Different frictional forces are generated on the upper surfaces of both sides, and the same applies to the lower surfaces of the thin plates in contact with the first and second lower rolls 10 and 20 having the inclined portions 2a and 2b.

Therefore, due to the difference in the frictional force in which the frictional force on the right side of the contact surface is larger than the frictional force on the left side of the contact surface, the right side velocity vector V1 is generated with respect to the straight velocity vector V, thereby causing the thin plate to be turned to the left side. It is possible to keep the sheet progressing properly as it progresses to the right where the contact area is large.

On the other hand, as shown in Fig. 4 (c) in contrast to the above, as the thin plate traveling in one direction meanders to the right, the amount of observation of the thin edge portion measured by the left optical sensor 50a decreases, while the right optical sensor ( When the observation amount of the thin edge portion measured in 50b) increases, the upper roll 30 descends while the cylinder members 40a and 40b descend by the meandering detection signal generated by the photosensors 50a and 50b. It is in close contact with the upper surface of the sheet which is operated and meanders to the right.

In this case, the left edge portion of the thin plate slanted to the right side is extended from the left inclined portion 2a to the contact area with the roll outer surface, while the right edge portion is moved to the right inclined portion 2b side so that the contact area is small. Since it loses, different frictional forces are generated in the upper surface and the roll outer surface on both sides of the thin plate left and right.

That is, due to the difference in the frictional force in which the frictional force on the left contact surface is greater than the frictional force on the right contact surface, the left speed vector V2 is generated with respect to the straight velocity vector V in the thin plate traveling in one direction, thereby meandering to the right. As the thin plate is calibrated to the left where a lot of contact area occurs, the thin plate can be correctly maintained as shown in FIG.

Subsequently, as the progress center of the thin plate is coincided with the center of the roll as shown in Fig. 4 (a), when the left and right edge portions of the thin plate are measured within the observation range of the optical sensors 50a and 50b, the The cylinder members 40a and 40b are raised and returned to space the upper roll 30 apart from the thin plate-like surface.

On the other hand, the thin plate traveling on the first and second lower rolls 10 and 20 during the lowering operation of the upper roll 30 for correcting the thin plate meandered to the right or the left is the first and second lower rolls 10. By touching the outer surface of the upper roll 30 descending between the (20) to be lowered to adjust the tension of the thin plate, the working rod length is lowered during operation of the cylinder member (40a, 40b) It is also possible to appropriately adjust the tensile size applied to the thin plate by adjusting the.

According to the present invention as described above, the sheet produced by the casting machine through the rolling mill through the roller table to correct the meandering generated during the one-way progress through the roller table to the coiler and at the same time adjust the tension of the sheet The cost can be reduced, the operating cost can be reduced, the manufacturing cost can be reduced, and the correct alignment of the sheet allows the various operations on the roller table to be carried out without difficulty.

While the invention has been shown and described with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit or scope of the invention as set forth in the claims below. I would like to clarify that knowledge is easy to know.

Claims (2)

In the apparatus for correcting the meandering caused by the thin plate cast in the sheet casting machine continuously passing through the rolling mill proceeds in one direction on the roller table 90, The first and second lower rolls 10 and 20 are driven on the lower frame 15 in the width direction of the thin plate, and the first and second lower rolls 10 are driven in contact with the lower surface of the thin plate and the outer circumferential surface advancing in one direction. Located between the (20), the upper surface and the outer peripheral surface of the thin plate in the lowering operation is in contact with the upper roll 30 is driven, the bearing block 31 for rotatably supporting the left and right ends of the upper roll (30) While equipped with a cylinder member (40a, 40b) to raise and lower the upper and lower in the upper frame 17, while sensing the left and right edges of the thin plate passing on the first and second lower rolls (10, 20) meandering Thin plate meandering device of the thin sheet casting machine, characterized in that it comprises an optical sensor (50a) (50b) for lowering the cylinder member (40a) (40b) when it occurs. The method of claim 1, The upper and lower rolls 10, 20 and 30 are 1:12 or 1: at both ends of the left and right ends so as to generate a velocity vector to move toward more contact due to a difference in contact area when contacting a thin plate which progresses in one direction. Forming an inclined portion (2) each having an inclined gradient of 15, wherein each inclined portion (2) is configured to have a length of about 1/4 of the total length of the roll having a length of 1.5 to 1.8 times the thin plate Thin plate meandering device of the sheet casting machine characterized in that.