KR20000043438A - Method and device for monitoring upward warp on-line of bar in rough milling process by using laser curtain - Google Patents

Abstract

PURPOSE: A method and a device for monitoring the upward warp on-line of a bar are provided to improve the defect of product quality by preventing equipment damage and misoperation and to enhance the rolling efficiency by minimizing the time of non-operation. CONSTITUTION: A laser oscillation light oscillated from a laser oscillation group is blocked while a front end part of a bar in which an upward warp is generated passes through a laser curtain. Then, some light receiving sensors of a light receiving group(8) does not receive the laser light. Herein, the light receiving sensor which does not receive the laser light sends an off-signal. In addition, other light receiving sensors transfer an on-signal to a monitor controlling system. Accordingly, the degree of upward warp in the bar is monitored.

Description

Online monitoring method of bar upward bending in bar rolling process using laser curtain and its device

The present invention relates to a method and apparatus for monitoring an upward warp of a tip end caused by abnormal rolling of a hot rough rolling process by arranging a plurality of laser sensors in a row to form a laser curtain.

In general, the slab extracted from the heating furnace during the hot rolling process is subjected to a reversible rough rolling process that simultaneously performs width rolling and thickness rolling, and thus hot rolled steel sheet without dimensions, shapes, and surface defects required by the finish rolling. Becomes

Rough rolling process is a process of making the thickness and width of the steel sheet required in the finish rolling through a reversible rolling pass of three or five passes as shown in FIG.

However, as shown in FIG. 2, the upper and lower rolls are moved upward or downward by abnormal working conditions such as speed difference between upper and lower rolls, diameter difference and wear difference, temperature difference between upper and lower parts of the material, and poor shape of the tip. Warpage occurs.

If the upward bending degree is less than 300mm, there is no problem in entering into the rolling mill, so that normal rolling is possible, but when more than that occurs, the equipment due to the collision with the rolling mill and auxiliary equipment is damaged, and the leading end to the table roll due to downward bending. It leads to prolonged downtime of work, inferior product quality and deterioration of rolling efficiency.

Therefore, it is necessary to measure the amount of warp in advance and to automatically stop the driver's action and bar transfer before the bar having excessive warpage enters the rolling mill and causes equipment damage and malfunction.

Conventionally, before the hot rolled bar is transported and enters the rolling mill, the bending state of the bar tip is roughly checked depending on the driver's naked eye or the image of the ITV, thereby increasing the burden on the driver's work and failing to check the excessive bending state. There was a problem of causing damage and malfunction.

The present invention has been invented to solve the above problems, the bar by the upward bending online monitoring method of the rough rolling process using the laser curtain bar in the rough rolling process to prevent equipment damage and malfunction due to the upward bending product The purpose is to improve the quality of the rolling and improve the rolling efficiency by minimizing the downtime.

The present invention having the above object is provided with a lens cleaning device and a cooling device, the laser oscillation group consisting of 16 laser sensors arranged in a line at 30mm intervals, and the laser light receiving group paired with 16 light receiving sensors And a supervisory control system that monitors the deflection of the bar by receiving the on / off signals of the light receiving sensors and controls the equipment, and a motor control system that controls the driving of the table rollers. By monitoring the upward warp of the tip part caused by abnormal rolling

1 is a schematic diagram for explaining a bar pass state of a conventional rough rolling process

Figure 2 is a schematic diagram for explaining the process of bending the bar upward

Figure 3 is a block diagram of the upward bending monitoring device forming a laser curtain according to the present invention

Figure 4 is an excerpt perspective view of the laser sensor housing by the present invention

5 is a flowchart for processing a bar upward bending measurement signal and control according to the present invention.

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

1: Work Roll 2: Edger Roll

4: Table Roller 5: Hot Rolled Bar

6: side guide 7: laser oscillation group

8: laser light receiving group 9: laser light

10: laser sensor housing 11: laser oscillation lens

12: reds cleaning device by compressed air

13: water cooling device 14: nozzle

15: Communication cable 16: Supervisory control system

17: motor control system

The bar upward bending online monitoring method of the present invention receives the laser light from the light receiving group in which the light receiving sensors arranged in line with the individual laser sensors are arranged when the laser light is oscillated in the laser oscillation group consisting of 16 laser sensors arranged in a row. Forming a laser curtain; measuring the upward deflection of the bar according to the on / off of the light receiving sensors when the hot rolled bar having the upward deflection enters the formed laser curtain; and monitoring the upward deflection of the measured bar Transmitting the bending information to the control system to monitor the bending state, monitoring the bending state and providing an alarm to the driver when excessive upward bending is detected, and the driver receiving the warning sound is entering the rolling mill side. The bars are automatically transported to prevent damage and malfunction of large equipment. .

In addition, the bar upward bending online monitoring device of the present invention is provided with a lens cleaning device 12 and a cooling device 13, the laser oscillation group 7 consisting of 16 laser sensors arranged in a line at 30mm intervals, A laser light receiving group 8 paired with 16 light receiving sensors, a monitoring control system 16 that monitors the bending degree of a bar by receiving the on / off signals of the light receiving sensors and controls the equipment, and drives the table rollers. It consists of a motor control system 17 for controlling the.

Referring to the operation of the present invention configured as described above is as follows.

In the present invention, in order to measure the amount of deflection of the bar tip portion, as shown in FIGS. 3 and 4, the lens cleaning device 12 and the cooling device 13 are provided, and the 16 housings 10 having the laser sensor are built therein. Are arranged in a line at 30mm intervals to form the laser oscillation group 7

And on the opposite side of the laser oscillation group (7) is provided a laser receiver group (8) in which the housings of 16 light receiver sensors are arranged to mate with each laser sensor.

Therefore, while receiving the laser beam 9 oscillated by the laser oscillation group 7 at the laser receiver group 8, the laser curtain is formed to a height of 510 mm at 30 mm intervals. Then, the side guides 6 are separated from each other so as to secure a space between the table rollers 4 so that the laser light 9 is not blocked, and to have a predetermined interval at the point where the laser light 9 passes.

In this state, in the rough rolling process, since the bar temperature is rolled at a high temperature of 1050 ° C. or higher, the housing 10 of the laser oscillation sensor is cooled in order to protect the laser sensor mounted inside the housing in a high temperature and harsh working environment. In order to prevent the coolant from circulating and attaching foreign substances and water vapor to the laser oscillation lens 11, the cleaning device 12 and the injected compressed air are injected in a large area to inject compressed air in front of the optical lens. A main nozzle was provided.

In addition, the communication cable 15 is configured to be connected to the rear surface of the housing so as to communicate with the monitoring control system 16, and the housing of the laser light receiving sensor is configured in the same form as the housing 10 of the laser oscillation sensor.

FIG. 5 is a flowchart for processing a bar upward bending measurement signal and controlling a part of the light receiving group 8 by blocking the laser beam 9 oscillated from the laser oscillation group 7 while the tip of the bar having the upward deflection passes through the laser curtain. The light receiving sensor becomes unable to receive the laser light 9.

At this time, the light receiving sensor that has not received the laser light 9 transmits the Off signal, and the other light receiving sensor transmits the On signal to the monitoring control system, thereby monitoring the degree of upward bending of the bar.

For example, in FIG. 5, when the tip of the bar 5 blocks upward and blocks the laser light 9, 8 and 8 at the moment passing through the laser curtain, the light receiving sensors 7 and 8 of the opposite side are laser. Although light cannot be received, other laser light is received by the light receiving sensor, and information is displayed by the measurement signal processing logic of the monitoring control system as shown in (18), indicating that the upward bending amount of the bar tip at that moment is 240 mm or more and 300 mm or less. Can be.

As described above, by measuring the on / off signal of the light receiving sensor continuously while the bar tip portion passes the laser curtain, it is possible to know the maximum height range of the tip upward bending.

In addition, when the upward deflection of the bar is excessively generated by the above-described measurement method and a signal is detected that is higher than the limit deflection amount, which is impossible to enter the rolling mill and causes equipment breakdown, a warning sound is provided to the driver. ), The roller driving stop signal is transmitted to stop the bar in progress with the rolling mill.

The present invention as described above can prevent the damage and malfunction of the equipment due to excessive bar upward bending to the extent that it is difficult to perform the work occurring in the rough rolling process by the bar upward bending online monitoring method of the rough rolling process using the laser curtain. In addition, there is an effect to improve the product quality defects, to improve the rolling efficiency by minimizing downtime, and to reduce the operator's work burden.

Claims (2)

Bar upward bending online monitoring method is to receive the laser light from the laser light receiving group in which the light receiving sensors are arranged in line with the individual laser sensors when the laser light is oscillated in the laser oscillation group consisting of 16 laser sensors arranged in a line Forming a curtain, measuring the upward deflection of the bar according to the on / off of the light receiving sensors when the hot rolled bar having the upward deflection enters the formed laser curtain, and the upward deflection of the measured bar by the monitoring control system. Transmitting bending information to monitor the bending state, and monitoring the bending state and providing an alarm to the driver when excessive upward bending is detected, and the driver receiving the warning sound automatically enters the bar that is entering the rolling mill side. By stopping the transfer, it is possible to prevent accidents and malfunctions of large facilities. How to raise the bar bending line monitoring of the rough rolling process using a laser curtain. The bar upward bending online monitoring device includes a lens cleaning device 12 and a cooling device 13, a laser oscillation group 7 consisting of 16 laser sensors arranged in a line at 30 mm intervals, and 16 light receiving sensors. A laser light receiving group 8 paired with a beam, a monitoring control system 16 for monitoring the deflection of the bar by receiving the on / off signals of the light receiving sensors and performing facility control, and a motor for controlling the driving of the table rollers. Bar upward bending online monitoring device of the rough rolling process using a laser curtain characterized in that the configuration consisting of a control system (17).