KR101053973B1 - Measuring device for measuring alignment deviation of segment girder and correcting misalignment - Google Patents

Abstract

The present invention relates to a device for measuring alignment deviation of segment girders and a method for correcting misalignment, and more particularly, to measure an alignment deviation between a non-driven roll girder and a driving roll girder provided in a segment in a casting machine in which a plurality of segments are continuously arranged. And it relates to an alignment deviation measuring device and a misalignment correction method of the segment girder through which the misalignment can be corrected.

An apparatus for measuring an alignment deviation of a segment girder according to the present invention includes a measuring unit for measuring a displacement difference between a non-driven roll girder and a driving roll girder provided in a segment of a casting machine, a controller for analyzing the displacement difference, and calculating an alignment deviation. And a monitor unit for displaying the displacement difference and the alignment deviation.

In addition, the misalignment correction method of the segment girder according to the present invention comprises the steps of measuring the absolute displacement and relative displacement during the initial alignment of the non-driven roll girder and the drive roll girder provided in the segment of the casting machine, the non-driven roll girder and the Measuring an absolute displacement and a relative displacement in the case of the deviation of the driving roll girders, and comparing the displacement difference between the absolute displacement and the relative displacement during the initial alignment, and the displacement difference between the absolute displacement and the relative displacement during the deviation misalignment. Comprising the step of adjusting the pressure of the cylinder connected to the drive roll girder by the alignment deviation.

Casting, continuous casting, segment, girder, displacement, deformation

Description

Apparatus for measuring alignment deflection of segment girders and method for correcting misalignment using it}

The present invention relates to a device for measuring alignment deviation of segment girders and a method for correcting misalignment, and more particularly, to measure an alignment deviation between a non-driven roll girder and a driving roll girder provided in a segment in a casting machine in which a plurality of segments are continuously arranged. And it relates to an alignment deviation measuring device and a misalignment correction method of the segment girder through which the misalignment can be corrected.

Continuous casting process continuously injects molten steel into a mold of a certain shape, and continuously casts the reacted cast into the lower side of the mold by slab, bloom, billet, etc. It is a casting process for manufacturing semi-finished products of various shapes.

Referring to FIG. 1, a schematic configuration of a conventional continuous casting machine (hereinafter, referred to as a “ring cycle”) in which the continuous casting process is performed, and the shape of a segment provided in the player are as follows.

Conventional players have a ladle (ladle; 10) containing molten steel refined in the steelmaking process, and a tundish (20) to temporarily receive the molten steel through an injection nozzle connected to the ladle 10 And, a mold (mold; 30) for initial solidifying the molten steel received from the tundish 20 in a predetermined shape and a series of operations to bend or straighten while cooling the non-solidified cast (S) provided in the lower portion of the mold (30) And a cooling line 40 in which a plurality of segments 50 are arranged in series.

On the other hand, the conventional segment 50 is provided with a plurality of rollers 56 to convey the cast (S) at the same time to apply friction to the upper and lower surfaces of the cast (S), the plurality of rollers 56 is a segment It is supported by a driven roll girder and a guide roll girder, which are supporting frames provided in 50. The driving roller connected to the driving roll girder is connected to the non-driving roll girder and is vertically pressed by the cylinder 58 provided on the upper part of the segment 50 unlike the guide roller which is idling at a predetermined position. I can move it.

However, in the conventional segment 50, since the pressure applied to the drive roller by the cylinder 58 is set to a constant size at the beginning of casting and does not vary, the ferrostatic pressure of the cast steel S becomes small at the end of casting. Due to this, the driving roller moves in the direction of the cast steel (S), and an alignment deviation occurs with the adjacent guide rollers. The alignment deviation acts as a misalignment in manufacturing the thickness of the cast steel (S) to a certain size. There was a problem in that the quality of the cast (S) is degraded by generating cracks or scrap.

In order to solve the above problems, the present invention calculates the alignment deviation by measuring the displacement difference between the non-driven roll girder and the drive roll girder provided in the segment in the machine in which a plurality of segments are continuously arranged for the molding of the cast steel In addition, the present invention provides a device for measuring alignment deviation of a segment girder and a method for correcting misalignment which can correct misalignment by adjusting a pressure of a cylinder connected to a driving roll girder.

In order to achieve the above object, an apparatus for measuring deviation of an alignment girder according to the present invention includes a measuring unit for measuring a displacement difference between a non-driven roll girder and a driving roll girder provided in a segment of a casting machine, and analyzing the displacement difference. And a control unit for calculating an alignment deviation and a monitor unit for displaying the displacement difference and the alignment deviation.

In addition, the misalignment correction method of the segment girder according to the present invention for achieving the above object comprises the steps of measuring the absolute displacement and relative displacement during the initial alignment of the non-driven roll girder and the drive roll girder provided in the segment of the casting machine; Measuring an absolute displacement and a relative displacement when the non-driving roll girder and the driving roll girder have a deviation, the difference between the absolute displacement and the relative displacement during the initial alignment, and the absolute displacement and the relative displacement during the deviation. Comparing the displacement difference of the to calculate the alignment deviation and adjusting the pressure of the cylinder connected to the drive roll girder by the alignment deviation.

According to the present invention, one side of the driving roll girder supporting the driving roller and one side of the non-driving roll girder supporting the guide roller and one side of the upper part of the segment are provided in the segment in a machine in which a plurality of segments are continuously arranged for drawing the cast slab. Each position sensor is attached to each other and the vertical distance between each other is measured in the casting process to measure the deformation degree, that is, the displacement difference of the non-driven roll girders and the driving roll girders.

In addition, by accurately calculating the alignment difference of the driving roll girder moved from the non-driven roll girder through the displacement difference measured by the position sensor, it is easy to correct the misalignment by adjusting the pressure of the cylinder that controls the vertical movement of the driving roll girder. Can be.

Therefore, by removing the unnecessary pressure applied to the cast during the casting process can be produced in the desired thickness, there is an effect of improving the quality of the cast by preventing cracks or scrap generated in the cast.

Hereinafter, with reference to the accompanying drawings will be described an embodiment according to the present invention in more detail. It will be apparent to those skilled in the art that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, It is provided to let you know. Like reference numerals in the drawings refer to like elements.

2 is a view showing the configuration of the alignment deviation measurement apparatus of the segment girder according to an embodiment of the present invention, Figure 3 is a view showing the configuration of the alignment deviation measurement apparatus of the segment girder according to another embodiment of the present invention. 4 is a view schematically showing a driving state of the end of casting of the measuring unit shown in FIG. 2 or FIG. 3. 6 to 9 are graphs showing experimental results of applying an alignment deviation measuring device and a misalignment correction method of a segment girder according to the present invention, which will be further described with reference to FIGS. 2 to 4.

2 to 4, the alignment deviation measuring apparatus 100 of the segment girder according to the exemplary embodiment of the present invention includes a non-drive roll girder 54 and a driving roll girder 52 provided in the segment 50 of the casting machine. Measurement unit 110 for measuring a displacement difference between the), a control unit 120 for calculating the alignment deviation by analyzing the displacement difference and a monitor unit 130 for displaying the displacement difference and the alignment difference.

Segment 50 is composed of a plurality of rollers 56 arranged up and down between the upper frame 51a and the lower frame 51b which are spaced apart and opposed to each other, and the plurality of rollers 56 while contacting the plurality of rollers (S) ) Pass. The plurality of rollers 56 are coupled to a non-driven roll girder 54 having a constant length in the segment 50 by a plurality of guide rollers 56b and idling by the cylinders 58 in the segment 50. It is composed of a driving roller 56a which is connected to a driving roll girder 52 whose length is changed by driving up and down and is rotated by a rotating means such as a motor (not shown).

In addition, the outer surface portion of the slab S passing through the segment 50 forms a solidified layer S _{1 in a} solid state, and an unsolidified molten steel layer S ₂ is formed inside the center portion of the slab S. In the outer surface direction in the iron positive pressure (F) acts, the size of the iron positive pressure (F) is changed in size depending on the casting process. As shown in FIG. 6, the casting process proceeds to the end of the casting, the positive static pressure F decreases, and thus, the driving roller 56a that is constantly pressurized by the cylinder 58 is in the direction of the slab S. Move rapidly, and the displacement amount X increases. On the other hand, the guide roller 56b is coupled to the non-driving roll girder 54, so that the variation of the displacement amount Y due to the change in the static pressure is not large.

Therefore, in order to make the thickness t of the cast steel constant, the pressure applied to the cast steel S by the driving roller 56a must be offset by adjusting the pressure of the cylinder 58 according to the fluctuation of the iron static pressure F. . To this end, the present embodiment provides an alignment deviation measuring device for segment girder that calculates the alignment deviation between the driving roller 56a and the adjacent guide roller 56b and thereby adjusts the pressure of the cylinder 58.

The measuring unit 110 measures the vertical distance between one side of the non-driving roll girder 54 and one side of the upper surface of the segment 50 at an absolute displacement y ₁ , y ₂ . 112b) and the relative displacement measurement position sensor 114 (114; 114a, 114b) measuring the vertical distance between one side of the non-drive roll girder 54 and one side of the drive roll girder 52 at a relative displacement (x ₁ , x ₂ ). ).

Here, the position of the measuring unit 110 shown in Figs. 2 and 3 is misaligned between the drive roll girder 52 and the non-drive roll girder 54 as in the beginning of casting (drive roll girder (from the reference line L) 52) is an out-of-state condition, and the measured absolute displacement (y ₁ ) and relative displacement (x ₁ ) are used as reference values for measuring the alignment deviation. In addition, the position of the measuring unit 110 shown in FIG. 4 is in a state in which misalignment occurs between the driving roll girder 52 and the non-driving roll girder 54 due to the fluctuation of the iron static pressure F as in the end of the casting. In this case, the measured absolute displacement (y ₂ ) and relative displacement (x ₂ ) are used to calculate the alignment deviation (z) by comparing with the absolute displacement (y ₁ ) and relative displacement (x ₁ ), which are previously measured reference values. do.

The control unit 120 calculates the displacement difference through the displacement values x ₁ , x ₂ , y ₁ , and y ₂ measured by the measuring unit 110, and through this, the driving roll girder 52 and the non-driving roll girder ( The alignment deviation z between 54) is calculated.

FIG. 5 is a diagram schematically illustrating a process of calculating an alignment deviation in a control unit according to an embodiment of the present invention. In this embodiment, the alignment deviation z is calculated through Equation 1 as follows.

[Equation 1]

z = (x ₂ -x ₁ )-(y ₂ -y ₁ ) = (x ₂ -y ₂ )-(x ₁ -y ₁ )

In (Equation 1), (x2-x1) and (y2-y1) mean the relative displacement and the absolute displacement before and after the misalignment occurs, the alignment deviation (z) is calculated as the difference value . In the embodiment of the present invention, rather than simply measuring the upper and lower deformation amount of the driving roll girder 52, the reason for measuring the deformation amount of the adjacent non-driven roll girder 54 is that the cast steel (F) is changed in the segment 50 ( This is because the deformation of the non-driven roll girder 54 may occur finely as S) passes, and this may be reflected in the calculation of the alignment deviation z, thereby measuring more accurate alignment deviation z.

Meanwhile, the alignment deviation z may be calculated as a difference between the relative displacement and the absolute displacement before and after the alignment failure occurs, and the difference between the relative displacement and the absolute displacement measured before the alignment failure occurs (x ₁ -y). ₁ ) and the difference (x ₂ -y ₂ ) between the relative displacement and the absolute displacement measured after misalignment occurs.

The control unit 120 in which the calculation of the alignment deviation z is performed as described above may include an amplifier configured to amplify a signal for the displacement values x1, y1, x2, and y2 measured by the measuring unit 110.

In addition, the control unit 120 is driven by adjusting the pressure of the cylinder 58 provided in the segment 50, such as the alignment deviation measuring device 100 'of the segment girder according to another embodiment of the present invention shown in FIG. The roll girder 52 may be connected to the pressure adjusting unit 140 to move up and down to measure the alignment deviation z of the segment girder as well as to measure the problem of direct misalignment by using the measured alignment deviation z. As shown in FIG. 7, the deviation is corrected by adjusting the pressure of the cylinder 58 by using the pressure adjusting unit 140, so that the deviation is more accurate than the conventional case in which the pressure adjusting unit 140 is not provided. You can see that the decrease significantly.

Hereinafter will be described with respect to the misalignment correction method of the segment girder according to an embodiment of the present invention.

In the misalignment correction method of the segment girder according to an embodiment of the present invention, the absolute displacement y ₁ during initial alignment of the non-drive roll girder 54 and the driving roll girder 52 provided in the segment 50 of the casting machine. And measuring a relative displacement (x ₁ ), and measuring an absolute displacement (y ₂ ) and a relative displacement (x ₂ ) when the non-driving roll girder 54 and the driving roll girder 52 have a deviation. And the displacement difference (y ₁ -x ₁ ) between the absolute displacement (y ₁ ) and the relative displacement (x ₁ ) during the initial alignment, and the absolute displacement (y ₂ ) and the relative displacement (x ₂ ) during the deviation. Comparing the displacement difference y ₂ -x ₂ to calculate the alignment deviation z and adjusting the pressure of the cylinder 58 connected to the drive roll girder 52 by the alignment deviation z. Include. Here, the absolute displacement (y ₁ , y ₂ ) measured at the time of initial alignment or misalignment is a measure of the vertical distance between one side of the upper surface of the segment 50 and one side of the non-driven roll girder 54, The relative displacement (x ₁ , x ₂ ) is the vertical distance between one side of the non-drive roll girder 54 and one side of the drive roll girder 52)

In one embodiment of the present invention, the displacement difference (y ₁ -x ₁ ) measured before the occurrence of the deviation failure in calculating the alignment deviation (z) and the displacement difference (y ₂ -x ₂ ) after the deviation failure occurs The difference was calculated as the alignment deviation z, but as described above with reference to FIG. 5, the relative displacement difference (x ₂ -x ₁ ) and the absolute displacement (y ₂ -y ₁ ) before and after occurrence of the deviation failure were calculated. The difference can also be calculated as the alignment deviation z.

By using the apparatus for measuring the alignment deviation of the segment girder and the misalignment correction method according to the present invention configured as described above, the incidence rate of the corner cracks (corner crack) and cast on the upper surface of the cast steel (S) as shown in Figs. (S) It was possible to greatly reduce the occurrence of the scrap (scrap) at the end (Fig. 8 is a graph showing the corner crack incidence rate before and after adjusting the hydraulic pressure of the cylinder 58 through the correction method according to the present invention, FIG. 9 is a view showing a scrap generation rate of the horse cast S before and after adjusting the hydraulic pressure of the cylinder 58)

Therefore, there is an effect of improving the quality of the cast through the alignment deviation measuring device and the misalignment correction method of the segment girder according to the present invention.

As mentioned above, although this invention was demonstrated with reference to the above-mentioned Example and an accompanying drawing, this invention is not limited to this, It is limited by the following claims. Therefore, it will be apparent to those skilled in the art that the present invention may be variously modified and modified without departing from the technical spirit of the following claims.

1 is a view schematically showing the configuration and the appearance of a segment of a typical continuous casting machine.

Figure 2 is a view showing the configuration of the alignment deviation measuring device of the segment girder according to an embodiment of the present invention.

Figure 3 is a view showing the configuration of the alignment deviation measuring device of the segment girder according to another embodiment of the present invention.

4 is a view schematically showing a driving state of the end of casting of the measuring unit shown in FIG. 2 or FIG.

5 is a view schematically illustrating a process of calculating an alignment deviation in a control unit according to an embodiment of the present invention.

6 to 9 are graphs showing the results of experiments applying the alignment deviation measuring device and the misalignment correction method of the segment girder according to the present invention.

Description of the Related Art [0002]

100, 100 ': alignment deviation measuring device 110: measuring unit

112: absolute displacement measurement position sensor 114: relative displacement measurement position sensor

120: control unit 130: monitor unit

140: pressure regulator 50: segment

52: drive roll girder 54: non-driven roll girder

56: a plurality of rollers 58: cylinder

Claims (7)

A measurement unit provided in a segment of the casting machine to measure a vertical distance between the non-drive roll girder and the drive roll girder and a vertical distance between the upper portion of the segment and the non-drive roll girder; A controller configured to calculate the alignment deviation between the non-drive roll girder and the drive roll girder by analyzing the displacement difference measured by the measurement unit; And A monitor unit configured to display the displacement difference and the alignment deviation; Alignment deviation measurement device of the segment girder comprising a. The method of claim 1, The measuring unit, An absolute displacement measuring position sensor for measuring a vertical distance between one side of the non-driving roll girder and one side of the segment upper surface; A relative displacement measurement position sensor for measuring a vertical distance between one side of the non-drive roll girder and one side of the drive roll girder; Alignment deviation measurement device of the segment girder comprising a. The method of claim 1, The control unit, an alignment deviation measuring device of the segment girder including an amplifier for amplifying a signal with respect to the displacement value measured by the measuring unit. The method of claim 1, The control unit, Is coupled to the top of the drive roll girder measuring device for alignment deviation of the segment girder connected to the pressure control unit for adjusting the pressure of the cylinder for driving the drive roll girder in the segment in the vertical direction. Absolute displacement, which is the vertical distance between the upper part of the segment and the non-drive roll girder, and relative displacement, which is the vertical distance between the non-drive roll girder and the drive roll girder, during initial alignment of the non-drive roll girder and the drive roll girder provided in the segment of the casting machine. Measuring; Measuring an absolute displacement which is a vertical distance between the upper portion of the segment and the non-driving roll girder and a relative displacement that is a vertical distance between the non-driving roll girder and the driving roll girder when the non-driving roll girder and the driving roll girder are in error. Wow; Calculating an alignment deviation by comparing the displacement difference between the absolute displacement and the relative displacement during the initial alignment with the displacement difference between the absolute displacement and the relative displacement during the deviation; And Adjusting the pressure of the cylinder connected to the drive roll girder by the alignment deviation; Misalignment correction method of the segment girder comprising a. The method of claim 5, And displaying the displacement difference and the alignment deviation before adjusting the pressure of the cylinder. The method of claim 5, The absolute displacement measured at the time of initial alignment or the deviation is measured by measuring the vertical distance between one side of the upper surface of the segment and one side of the non-drive roll girder, the relative displacement is one side of the non-drive roll girder and the drive. The misalignment correction method of the segment girder, characterized in that the vertical distance between one side of the roll girder.

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