KR100939374B1 - Non-contact roll measuring device for twin roll type strip caster - Google Patents

Abstract

The present invention is a non-contact casting roll state measuring device for measuring the gap between the casting rolls and the axial deviation and the alignment of the casting rolls in a twin roll sheet caster.

The non-contact casting roll measuring apparatus of the present invention of a twin-roll sheet caster is a seating part consisting of a seating bearing in which an outer ring is seated on a casting roll barrel and a seating shaft inserted into an inner ring of the seating bearing, and a sensor fixed to the seating shaft. A base, a pair of eddy current displacement sensors provided at the center of the sensor base, a laser micrometer including prisms installed above and below the eddy current displacement sensor, a laser displacement sensor installed at the bottom of the sensor base, and a reference plane for measuring casting roll alignment. In order to include a reference device installed on the edge dam rail and the calibration cradle is mounted to the sensor base.

Through the non-contact casting roll measuring device of the twin-roll thin plate casting machine of the present invention, it is possible to automate the casting roll preparation operation, and the stability of the casting operation can be improved and the quality of the produced sheet can be improved.

Double Roll Sheet Casting Machine, Laser Micrometer, Prism, Eddy Current Displacement Sensor, Laser Displacement Sensor, Calibration Cradle

Description

Non-contact casting roll measuring device of twin roll sheet casting machine {NON-CONTACT ROLL MEASURING DEVICE FOR TWIN ROLL TYPE STRIP CASTER}

The present invention is a non-contact casting roll state measuring device for measuring the gap and axial deviation between the casting rolls and the alignment state of the casting rolls in a twin-roll sheet caster, more specifically, after the automatic measurement of the state of the casting rolls in a non-contact manner It is a non-contact casting roll measuring device of a twin-roll sheet caster that feeds back to the driving device and enables automation of the casting roll preparation work.

The continuous casting process of a thin plate using a twin-roll type sheet casting machine, as shown in FIG. 1, is typically performed in a molten steel between a pair of casting rolls 201 which are cooled by water through an immersion nozzle 12 connected to a tundish 10. By supplying (M) and rotating the casting rolls 201, a pair of solidification shells formed on the surface thereof are coalesced near the closest contact point of the casting rolls 201 to continuously form a thin plate having a thickness of 2 to 4 mm. It is a method of manufacturing.

In order to produce a thin plate having a target thickness, the gap between the pair of casting rolls 201 must be accurately identified and controlled, but the molten steel M is directly contacted between both casting rolls 201 and the outflow of molten steel M on the side. Since the side edge dam 13 is prevented from being installed, it is not possible to install a device capable of directly measuring the gap between the two casting rolls 201.

Thus, as shown in FIG. 2, the conventional casting roll measuring apparatus has a main cylinder 204 and the main cylinder 204 outside the casting roll bearing housing 203 for driving the casting roll 201 as shown in FIG. 2. The contact displacement sensor is installed on the c) to indirectly grasp the gap of the casting roll 201 by the moving distance of the sensor to drive the cylinder.

However, the gap between the casting rolls 201 is continuously changed due to the processing deviation of the casting roll 201 diameter, the internal tolerances of the bearings installed inside the casting roll bearing housing 203, and the thermal expansion of the casting roll 201 before and after casting. In order to compensate for this, the gap of the casting roll 201 before casting is directly measured and fed back to the contact displacement sensor, and during casting, the thickness of the thin plate generated by the casting process should be measured to compensate for the roll gap.

Among these, the thickness of the thin plate during casting can be automatically measured and compensated online by using X-ray to feed back to the casting roll 201. However, in order to measure the gap of the casting roll 201 before casting, conventionally, a filler gauge is cast. The gap between the rolls 201 and the gap between the casting rolls 201 was measured by the thickness of the filler gauge. However, this method takes a lot of measurement time and a measurement error corresponding to the minimum thickness of the filler gauge is 30 μm. In addition, since the wear roll side end face 202 is worn out, the workability and the measurement result are markedly degraded.

And the axial deviation of both casting rolls 201 affecting the outflow of the molten steel (M) to the side of the casting roll 201 is the remaining casting roll 201 after the straight edge is in contact with one of the casting roll side end face 202 And the filler gauge is inserted into the gap between the straight edge and the straight edge, and then the alignment cylinder 205 is driven to compensate. However, since the straight edge is heavy, the straight edge is shaken when the filler gauge is inserted. Is difficult and time consuming, and measurement errors of 30 microns, the minimum thickness of the filler gauge, occur.

In addition, the alignment state of the casting roll 201 to determine the center of the thickness of the sheet is aligned with the position of the casting roll 101 by measuring the distance to one casting roll 201 retreat back completely from any one point outside, After the aligned one casting roll 201 is advanced to the casting position, the other casting roll 201 is moved to the casting position and measured by the method of fitting to the aligned casting roll 201, but the external arbitrary as the first reference One point is on the unprocessed surface and can be deformed at all times, and it is difficult to verify the alignment of the casting roll 201 at the casting position because the alignment of the casting roll 201 is retracted.

All of the above measurements are measured manually by the operator and then informs the driver of the values so that the operator operates the driving mechanisms of the main cylinder 204 and the alignment cylinder 205 and then measures and checks them again. Errors may occur, and 2 ~ 3 people are always needed, and errors between communication may occur.

In the past, an apparatus for measuring the gap of the casting roll 201 by using a non-contact displacement sensor has been attempted, but errors are large due to the degree of processing of the casting roll 201 diameter, lack of available space, and a high temperature environment, making it difficult to accurately measure and contactless. The external base to which the displacement sensor is attached always guarantees the same position with respect to the casting roll 201 and cannot be guaranteed that the shape is unchanged before and after casting.

The present invention is to solve the above problems, without damaging the surface of the casting roll by using a non-contact sensor, it is possible to shorten the measurement time within a few minutes to feed back the measurement results to the casting roll drive device to automate all processes An object of the present invention is to provide a non-contact casting roll measuring apparatus for a twin roll sheet casting machine.

In order to achieve the above object, the non-contact casting roll measuring apparatus of the twin-roll sheet caster comprises a seating portion consisting of a seating bearing bearing the outer ring is seated on the casting roll barrel and a seating shaft inserted into the inner ring of the seating bearing; A sensor base fixed to the seating shaft; A pair of eddy current displacement sensors provided in the center of the sensor base; A laser micrometer including a prism disposed above and below the eddy current displacement sensor; A laser displacement sensor installed at the lower end of the sensor base; A reference device mounted to an edge dam rail to provide a reference plane for measuring the casting roll alignment; And a calibration holder on which the sensor base is mounted.

The sensor base may be perpendicular to the seating portion in the direction of gravity.

The eddy current displacement sensor is installed horizontally characterized in that for measuring the deviation of the casting roll in the axial direction.

The laser micrometer including the prism is composed of a light transmitting portion and a light receiving portion, the light transmitting portion and the light receiving portion is provided on one side of the sensor base toward the axial direction of the casting roll, the laser emitted from the light transmitting portion by the prism It is characterized by measuring the gap of the casting roll is received by the light receiving portion by bending twice at 90 °.

The reference device is characterized in that it comprises a base which can be fixed to the edge dam rail and a vertical block multi-stage processing with a vertical line with respect to the center of the edge dam rail.

The laser displacement sensor is characterized in that for measuring the alignment state of the casting roll by measuring the distance received by the laser beam reflected on the vertical block of the reference device.

The calibration cradle is characterized in that there is a sensor zero adjustment groove for adjusting the zero point of the laser micrometer, the eddy current type displacement sensor, the laser displacement sensor installed in the sensor base.

The non-contact casting roll measuring device of the twin roll sheet casting machine of the present invention is placed on the casting roll, which is a direct measurement target, to measure the gap, axial deviation, and alignment state of the casting roll, and then feed back to each driving device to enable automation of the casting roll preparation work. do.

Thus, by minimizing the measurement error of the casting roll state to prevent accidents such as molten steel leakage in advance, and to improve the stability of the casting operation as well as to protect the casting facilities.

In addition, it is possible to significantly reduce the casting preparation time, and to improve the quality of the thin plate produced as a product by increasing the precision of the center and thickness of the thin plate.

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

Figure 3 is a schematic diagram of the present invention is installed in a twin roll sheet caster of the present invention, the casting roll measuring device of the twin roll sheet caster. Figure 4 is a perspective view of the casting roll measuring apparatus of the present invention twin roll sheet caster, Figure 5 is a perspective view of a portion excluding the calibration cradle in the casting roll measuring apparatus of a twin roll sheet caster and the A-A 'portion of the vertical block of the reference device It shows the cross section of.

As shown in FIG. 3, the outer ring of the seat bearing 501 is installed so that the outer ring directly touches the barrel of the casting roll 201, and is seated on the inner ring of the seat bearing 501 as shown in FIG. 5. The secondary shaft 502 is provided, and the sensor base 503 precision-machined to the seating shaft 502 is provided.

The mounting shaft 502 on the side where the sensor base 503 is not installed is lengthened to compensate for the weight of the sensor base 503 to achieve the center of gravity at the mounting bearing 501.

The casting roll 201 is rotated in the same direction by the seat bearing 501 to which the sensor base 503 is fixed, so that the sensor base 503 is always perpendicular to the gravity direction with respect to any position.

The sensor base 503 is directly installed on the casting roll 201 to be measured through the seat bearing 501, the sensor base 503 is kept vertical, and the seat bearing 501 is always the casting roll. Since it is located on the center line of 201, it is possible to ignore the constraint that the base of the non-contact measuring device, which has been tried so far, must be invariant in position and shape with respect to the casting roll 201.

In the center of the sensor base 503, a pair of eddy current displacement sensors 507 are horizontally installed, and each eddy current displacement sensor 507 measures the distance to each casting roll end face 202. The deviation value which is the difference in the axial distance between the two casting rolls 201 is detected.

In the case where a deviation occurs in both casting rolls, the deviation value is offset by feeding back the deviation value to the alignment cylinder 205 that is already installed to move the casting roll 201 in the axial direction and moving the casting roll 201 back and forth. Complete the axial alignment.

In the center of the sensor base 503, a laser micrometer light transmitting part 504 and a light receiving part 505 with prism 506a and 506b are provided in the vertical direction.

 In general, a laser micrometer is used to measure the gap between the casting rolls 201, and a laser of a predetermined width is removed by the casting rolls 201 by shooting in a direction perpendicular to the axis where both casting rolls 201 meet. By detecting only the remaining width of the casting roll 201 to recognize the gap. However, when a general laser micrometer is installed between the casting rolls 201, the distance between the casting rolls 201 having a diameter of 1 m or more is very narrow, and the measurement distance becomes far, and the measurement accuracy is proportional to the measurement distance due to the characteristics of the laser. Will fall.

In order to shorten the measurement distance and increase the measurement accuracy, the laser micrometer light transmitting part 504 and the light receiving part 505 are provided in the same direction in the axial direction, and the laser is placed between the laser micrometer light transmitting part 504 and the light receiving part 505. Two prisms 506a and 506b which can be bent twice at 90 ° are provided. The prism has a width of 20 mm, which is larger than the gap of the measuring casting roll 201 of a maximum of 10 mm. In this case, as shown in FIG. 5, the laser beam projected from the light projecting unit 504 is hit by the hypotenuses of the prisms 506a and 506b in the form of right triangles and bent twice at 90 °.

The gap measurement principle of the casting roll 101 is that the full width laser coming from the light emitting portion 504 of the laser micrometer located above the gap of the casting roll 101 has a width of 20 mm installed in the laser micrometer light emitting portion 504. Only the 20 mm width of the full width of the laser is bent by 90 degrees by the prism 506a, and then the gap is passed by the casting roll 201 of the maximum 10 mm width smaller than the first prism. After the removal, only the remaining width was turned 90 degrees back to the left by the second prism 506b installed on the light receiving portion 505 of the laser micrometer located below the gap of the casting roll 201, and finally the light receiving portion of the laser micrometer ( Only lasers corresponding to the width of the gap of the casting roll 201 are received by the 505 to measure the gap of the casting roll 201.

The gap measured in the casting roll 201 is fed back to the main cylinder 204 installed in the casting roll bearing housing 203 to complete the gap setting of the casting roll 101.

In order to measure and set the axial deviation and the gap of the casting roll 101, the alignment state of the casting roll 201 itself must be ensured, and the alignment state of the casting roll 201 is fixed while being fixedly installed outside the casting roll 201. The reference point that can be ensured is the edge dam rail 206 that prevents the leakage of molten steel on the side of the casting roll 201 is most suitable.

 The reference device 509 installed in the edge dam rail 206 is located at the center between the base 511 which can be fixed to the edge dam rail 206 and the edge dam rail 206 at a predetermined height, and the edge dam rail 206. ) Includes a vertical block 510 processed with a fine vertical line in the form of a staircase.

An edge dam rail stopper 207 is provided on the casting roll 201 side of the edge dam rail 206 so that the edge dam 13 can no longer go out toward the casting roll 201, and this edge dam rail stopper 207 is provided. The distance from the casting roll 201 to the casting roll 201 is always the same, so that the reference device 509 is placed on the edge dam rail 206 and in contact with the edge dam rail stopper 207 so as to be separated from the casting roll 201 at the same distance. To ensure.

The outer ring of the seat bearing 501 is seated on the casting roll barrel, and a seat shaft 502 is inserted into the seat inner ring of the seat bearing 501, thus vertically below the seat shaft 502. The vertical center line of the fixedly installed sensor base 503 coincides with the center line of the gap of the casting roll 201, and a laser displacement sensor measuring a distance by receiving laser light reflected from the lower end of the vertical center line of the sensor base 503. 508 is attached, and the laser displacement sensor 508 transmits the laser toward a fine vertical line in a step shape processed in the vertical block of the reference window 509 installed in the edge dam rail 206.

 Stepped fine vertical lines on the vertical block 510 of the reference device 509 is processed to a width of 300 μm, about 10 times the diameter of the laser spot.

Referring to the cross-sectional view of the A-A 'portion of the vertical block in Figure 5, the processing surface of the same width as 300㎛ has different depths on the left and right sides, the deepest in the center of the edge dam rail 206 and 11㎛ on the left side The right side is processed to increase gradually with the minimum common multiple at a height of 13 μm, so that the center of the gap of the casting roll 201 gap in the center of the edge dam rail 206 is determined as the length measured by the laser displacement sensor 208. By driving the main cylinder 204 installed in the casting roll bearing housing 203 to move the casting roll left and right, the distance measured from both sides of the casting roll 201 by the laser displacement sensor 208, From the side of the casting roll 201 by being equally sensed by the deepest length of the fine vertical line of the step shape processed in the vertical block 510 of the reference device 509 on the edge dam rail 206 installed on the outside of the casting roll Outflow of molten steel So it is to complete the casting rolls (201) aligned with the center of the edge dams may prevent an accident such as a spill of molten steel in advance.

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The sensor base 503 in which the seat bearing 501 is installed is mounted on the calibration holder 401. When the sensor base 503 is placed on the calibration holder 401, the seat bearing 501 is mounted in the seat bearing mounting groove. A sensor zero adjustment groove 403 is provided which shows the same casting roll 201 gap and deviation as it was when seated on 502 and seated on casting roll 201.

Since the sensor zeroing groove 403 is precisely processed and its value is known, the reference gap of the laser micrometers 504 and 505 and the reference distance of the eddy current displacement sensor 507 are determined using the sensor zeroing groove 403. The zero point can be adjusted.

In addition, since the reference device 509 provides a precisely processed rail and stopper on which the reference device 509 can be mounted, the zero point can be adjusted by measuring the reference distance of the laser displacement sensor 508.

1 is a schematic view showing a twin roll sheet caster.

Figure 2 is a schematic diagram showing a casting roll apparatus of a twin roll sheet caster.

Figure 3 is a schematic diagram of the present invention is installed in a twin roll sheet caster of the present invention, the casting roll measuring device of the twin roll sheet caster.

Figure 4 shows a perspective view of the casting roll measuring apparatus of the present invention twin-roll sheet caster.

Figure 5 shows a perspective view of a portion excluding the calibration cradle in the casting roll measuring apparatus of the present invention twin-roll sheet caster and a cross-sectional view of the AA 'portion of the vertical block of the reference device.

* Explanation of symbols for the main parts of the drawings

201: casting roll 501: seat bearing

202: casting roll side end face 502: seat shaft

203: casting roll bearing housing 503: sensor base

204: main cylinder 504: laser micrometer floodlight

205: alignment cylinder 505: laser micrometer light receiving unit

206: edge dam rail 506a: first prism
506b: second prism

207: edge dam rail stopper 507: eddy current displacement sensor

508: laser displacement sensor

                                       509: reference device

510: vertical block

511: base

300: non-contact casting roll measuring device of twin roll sheet casting machine

301: Calibration Cradle

302: Mounting Bearing Mounting Groove

303: Sensor zeroing groove

Claims (8)

A seating part including a seating bearing in which an outer ring is seated on a casting roll barrel, and a seating shaft inserted into an inner ring of the seating bearing; A sensor base fixed vertically below the seat shaft; A pair of eddy current displacement sensors provided in the center of the sensor base; A laser micrometer including a prism disposed above and below the eddy current displacement sensor; A laser displacement sensor installed at the lower end of the sensor base; A reference device fixedly mounted on a base coupled to an edge dam rail spaced below one side of the sensor base; And Non-contact casting roll measuring device of a twin-roll sheet caster comprising a calibration holder is mounted to the sensor base. The method of claim 1, Non-contact casting roll measuring device of a twin-roll sheet caster, characterized in that the sensor base is perpendicular to the seating portion in the direction of gravity. The method of claim 1, The eddy current displacement sensor is horizontally installed non-contact casting roll measuring device of a twin roll sheet caster, characterized in that for measuring the deviation in the axial direction of the casting roll. The method of claim 1, Laser micrometer including the prism is composed of a light transmitting portion and a light receiving portion, the light transmitting portion and the light receiving portion of the non-rolling cast roll measuring apparatus of the twin-roll sheet caster, characterized in that installed on one side of the sensor base toward the axial direction of the casting roll. . The method of claim 4, wherein And a laser beam emitted from the light transmitting part is received at the light receiving part by bending twice by 90 ° by the prism to measure a gap of the casting roll. The method of claim 1, The reference device includes a base that can be fixed to the edge dam rail and a non-contact casting roll measurement of a twin roll sheet caster, characterized in that it comprises a vertical block multi-stage processing with a vertical line with respect to the center of the edge dam rail. Device. The method of claim 1, The laser displacement sensor is a non-rolling cast roll measuring device of a twin roll sheet caster, characterized in that for measuring the distance of the casting roll by measuring the distance received by the laser beam reflected on the vertical block of the reference device. The method of claim 1, The calibration cradle is a non-rolling cast roll measuring apparatus of a twin roll sheet caster, characterized in that there is a sensor zero adjustment groove for adjusting the zero point of the laser micrometer, the eddy current type displacement sensor, the laser displacement sensor installed in the sensor base. .

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