KR100920309B1 - Apparatus for measuring shape of strip - Google Patents

Abstract

The present invention relates to an apparatus for measuring the shape of a hot rolled steel sheet, comprising: a gauge room accommodating a sensor box including a laser generator, a beam path mirror, a fixed mirror, and a camera on an upper portion of a table roll; By changing the path of the beam to measure the shape of the steel sheet irrespective of the width size of the hot rolled steel sheet.

To this end, the present invention maintains a pressure higher than atmospheric pressure, is installed on the top of the table roll, and fixed to the both sides of the two sensor boxes for accommodating the laser generator and the camera and the mirror portion, respectively to adjust the angle of the mirror portion of the laser beam A gauge room unit for changing a path to measure a shape of the hot rolled steel sheet; It is electrically connected between the gauge room and the rolling mill, and calculates the measurement position of the hot-rolled steel sheet and the angle of the mirror unit according to the width size, and applies the signal detected by the camera of the gauge room unit to a specified equation to the shape data of the hot-rolled steel sheet It provides a shape measuring apparatus of a hot rolled steel sheet which is composed of a calculator for transmitting to the host computer or directly controlling the rolling machine to calculate the and using the operation result to control the rolling mill.

Hot rolled steel sheet, shape, measurement, beam path mirror, laser, CCD camera

Description

Apparatus for measuring shape of strips

1 is a perspective view of a shape measuring apparatus of a hot rolled steel sheet according to the prior art

Figure 2 is a side view of the shape measuring apparatus of the hot rolled steel sheet according to the prior art

3 is a perspective view showing a part of the bogie structure of the shape measuring apparatus of the hot rolled steel sheet according to the prior art

Figure 4 is a graph showing the results of the vertical displacement of the hot rolled steel sheet according to the prior art

5 is a perspective view of a shape measuring apparatus of a hot rolled steel sheet according to an embodiment of the present invention;

6 is a sectional view showing a detailed configuration of the gauge room unit according to the present invention;

7 is a cross-sectional view showing a detailed configuration of a sensor box according to the present invention

8 is a perspective view showing a detailed configuration of a mirror unit according to the present invention

9 is a perspective view showing the configuration of a beam path mirror according to the present invention.

10A and 10B are diagrams illustrating a laser generator unit and a camera unit according to the present invention.

11 is a detailed view for explaining a shape measuring method of a hot rolled steel sheet according to the present invention;

12 is a flow chart of the shape measurement operation of the hot rolled steel sheet according to the present invention

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

10: hot rolled steel sheet 15: table roll

20: balance 21: displacement meter                 

23: rail 24: laser beam

25: drive motor 26: bogie drive shaft

30: calculator 40: rolling mill

50: actual shape of hot rolled steel 60: representation of measurement shape

100: gauge room part 101: air piping

110: sensor box 112: laser box

113: camera box 120: mirror portion

121: beam path mirror 122: mirror fixing plate

123: worm wheel 124: bearing

125: worm 126: motor

127: rotary encoder 128: gearbox

129: fixed mirror 130: laser generator portion

131: laser beam expander 132: microscope lens

133: optical lens 140: laser beam

150: camera unit 151: camera lens

155: CCD cell 160: calculator

The present invention relates to an apparatus and a method for measuring the shape of a hot rolled steel sheet produced in a steel mill hot rolling process using a laser generator, a beam pass mirror, a fixed mirror, and a camera, and more particularly, to adjust an angle of a beam pass mirror. To measure the shape of the hot-rolled steel sheet by scanning the laser light generated by the laser generator at a desired point in the width direction of the hot-rolled steel sheet and detecting the laser light reflected from the hot-rolled steel sheet by the camera. And to a method.

In general, the shape measuring apparatus of a hot rolled steel sheet that is conventionally used, as shown in FIGS. A plurality of steel plates 10 are installed at the top, and the trolley first moves to the line center, and then each displacement gauge 21 is moved until it reaches the measurement position of the hot rolled steel sheet. The laser beam 24a is irradiated onto the hot-rolled steel sheet by the displacement meter 21, and then the laser beam 24b that is reflected therefrom is detected.

The calculator 30 then measures the shape 60 of the hot rolled steel sheet similar to the actual shape 50 of the steel sheet as shown in FIG. 4 from the measurement data measured from the hot rolled steel sheet traveling on the table roll 15. Is calculated and the result is fed back to control the rolling mill 40.

However, in the conventional hot rolled steel sheet shape measuring apparatus as shown in FIG. 3, in order to measure the shape of the hot rolled steel sheet, the cart 20 is driven, and the position of the displacement gauge 21 is changed according to the width size of the hot rolled steel sheet. The displacement has to be moved to the upper portion of the hot rolled steel sheet has the following problems.                         

First, the rail 23, the drive motor 25, the bogie drive shaft 26, etc., in order to move the bogie 20 to the center of the line and then move each displacement meter 21 to the upper portion of the hot rolled steel sheet to be measured. Due to the use of complex devices, the fixed state of the laser generator and the detection unit is distorted due to vibrations generated during movement.

Second, in order to measure the shape, the calculator 30 calculates a target position of the displacement gauge 21 according to the width size to operate the drive motor 25 of the displacement gauge, and the power of the drive motor is driven to the bogie drive shaft 26 of the displacement gauge. ), The displacement meter moves toward or away from the center with respect to the line center. In this case, the displacement gauge may not stop at the set position due to inertia, so it may cause measurement error due to measurement position error.If the width is very small, the adjacent displacement gauges contact each other, so that the shape of the narrow hot rolled steel sheet cannot be measured. There is a problem.

Third, since the displacement meter of the shape measuring device is located directly on the hot-rolled steel sheet, it is directly affected by the high heat and water vapor, so that the device is deteriorated quickly, thereby lowering the reliability of the measurement data.

Therefore, the present invention has been made to solve the above problems, the present invention is provided with a gauge room on the top of the table roll, the laser generator, a beam path mirror, a fixed mirror and a camera on both sides of the interior After fixing the sensor box to provide an apparatus and method for measuring the shape of the steel sheet to change the path of the laser beam by adjusting the angle of the beam path mirror to measure the shape of the steel sheet irrespective of the width size of the hot rolled steel sheet The purpose is.

In order to achieve the above object, the present invention maintains a pressure higher than atmospheric pressure, is installed on the top of the table roll, the two sensor boxes for receiving the laser generator unit, the camera unit and the mirror unit, respectively fixed to both sides of the mirror A gauge room unit configured to measure a shape of the hot rolled steel sheet by changing a path of a laser beam by adjusting a negative angle; The shape of the hot rolled steel sheet is electrically connected between the gauge room part and the rolling mill, and calculates the measurement position of the hot rolled steel sheet and the angle of the mirror part according to the width size, and applies a signal detected by the camera part of the gauge room part to a specified equation. Provided is a shape measuring apparatus for a hot rolled steel sheet which is composed of a computing unit which transfers data to a host computer or directly controls the rolling mill so as to calculate data and control the rolling mill using the calculation result.

The objects, features and advantages of the present invention will be more readily understood by reference to the accompanying drawings and the following detailed description.

Hereinafter, the configuration and operation of the present invention with reference to the accompanying drawings in detail as follows.

5 is an overall configuration diagram of an apparatus for measuring a shape of a hot rolled steel sheet according to an embodiment of the present invention, the upper part of the table roll at the rear end of the rolling mill 40 with the air pipe 101 connected to provide a good measurement environment. Two sensor boxes 110a and 110b, which are installed and composed of a laser generator unit, a beam path mirror, a fixed mirror, and a camera unit, are respectively fixed to both sides of the inside thereof, and the path of the laser beam 140 is adjusted by adjusting the angle of the beam path mirror. And a gauge room part 100 for measuring the shape of the hot rolled steel sheet regardless of the width size of the hot rolled steel sheet, and electrically connected between the gauge room part and the rolling mill, and the measuring position of the hot rolled steel sheet and the beam path mirror Compute the angle, calculate the shape data of the hot-rolled steel sheet by applying the signal detected by the camera unit of the gauge room unit to a specified formula and using the calculation result Group is transmitted to the host computer to control the mill, or shows a direct calculation base (160) for controlling the rolling mill. Here, the calculator 160 calculates angle and shape data by using Equations 1 and 2 below.

tanθ = ℓ / h

Here, θ is the angle of the beam path mirror, ℓ is the horizontal distance between the laser generator portion (or camera portion) and the measuring point, h is the vertical distance between the laser generator portion (or camera portion) and the table roll upper surface.

Where L is the length of the hot rolled steel sheet, Yi is the vertical displacement of the hot rolled steel sheet, Vi is the speed of the hot rolled steel sheet, Ti is the laser beam detection time, and n is the number of measurements during one integration time.                     

6 is a cross-sectional view showing a detailed configuration of the gauge room unit according to the present invention, Figure 7 is a cross-sectional view showing a detailed configuration of the sensor box according to the present invention, the gauge room unit 100 is spaced at a predetermined interval around the table roll It consists of two sensor boxes (110a, 110b) installed on both sides in a state. Each sensor box includes a plurality of laser boxes 112 each having a laser generator 130 for generating a laser beam, and a plurality of camera boxes 113 with a camera unit 150 for detecting a laser beam. And a mirror unit 120 for precisely controlling and changing the path of the laser beam. The sensor boxes 110a and 110b are for fixing each sensor. In the drawing, two sets of laser boxes and three sets of camera boxes are mounted on the left sensor box 110b, and the left sensor box on the right sensor box 110a. The laser box 3 set and the camera box 2 set are illustrated to correspond to the configuration.

In addition, the gauge room part 100 is located on the hot-rolled steel sheet and is a space of a suitable size to block heat, suppress vibration, and prevent infiltration of moisture, and in particular, positive pressure air is used to maintain a pressure higher than atmospheric pressure inside the room. The air piping 101 to supply is connected.

8 is a perspective view showing a detailed configuration of a mirror unit according to the present invention. In the drawing, a mirror unit installed in a camera box is illustrated. Since the mirror unit is configured in the same manner as the radar box, detailed description thereof will be omitted.

As shown in FIG. 8, the mirror unit 120 is fixedly installed on one sidewall of the laser box and the camera box, and firmly supports an angle-adjustable beam path mirror 121 and accommodates gears therein. The gearbox 128 and other sidewalls of the laser box and the camera box are fixedly installed opposite to the gearbox, and change the path of the laser incident from the beam path mirror to reflect toward the camera part or exit from the laser generator part. It comprises a fixed mirror 129 for changing the path of the laser to reflect toward the beam path mirror. This configuration is installed one set in each laser box and camera box.

9 is a perspective view showing a portion of the cover of the gear box 128 in order to explain the configuration of the beam path mirror according to the present invention, the gear box 128 is a beam path mirror 121 for reflecting the laser light It is installed to protrude to the outside, the fixing plate 122 for attaching the beam path mirror, the worm wheel 123 for rotating the fixing plate, the bearing 124 for supporting the worm wheel, and the worm wheel precisely A worm 125 for rotating, a motor 126 for applying power to the worm, and a rotary encoder 127 for precisely counting the number of rotations of the motor form one configuration so as to form a structure. Are accepted.

FIG. 10A is a detailed configuration diagram of the laser generator unit according to the present invention. The laser generator unit 130 is assembled in the laser box 112 of FIG. 7 using a separate fixing stand 134. It consists of the beam expander 131 to adjust, the microscope lens 132 which adjusts the intensity of a laser beam, and the optical lens 133 which focuses.

10B is a detailed configuration diagram of the camera unit according to the present invention, wherein the camera unit 150 is assembled in the camera box 113 of FIG. 7 by using a separate support 152 and a plurality of fixing plates 153 and 154, and a laser beam. And a camera lens 151 for receiving light and a CCD camera 155 for detecting a signal. The camera lens 151 is adjusted to adjust the sensitivity of the signal.

Figure 11 is a detailed view for explaining the shape measurement process of the hot rolled steel sheet according to the present invention, Figure 12 is a flow chart of the shape measurement operation of the hot rolled steel sheet according to the present invention, the operation of the present invention will be described in detail as follows.

First, when the power is supplied to the calculator unit 160, power is applied to the laser generator 130 in the sensor box 110, the motor 126 for driving the beam pass mirror, and the camera unit 150, and the laser in the sensor box. The laser beam generated by the generator portion passes through the fixed mirror 129, the beam pass mirror 121, and the hot rolled steel sheet 10, and passes through the beam pass mirror 121 and the fixed mirror 129 in the opposite sensor box. Is detected by the CCD camera 155.

At this time, the shape measuring device generates a laser light in the laser generator section while placing the standard sample corresponding to the vertical displacement of the hot-rolled steel sheet in the width direction before measuring the shape, and the beam path mirror under the laser generator section and the camera section The laser light is detected by the CCD camera while automatically adjusting the angle in 0.01 degree increments.

The CCD camera 155 inside the camera unit has a 1: 1 correspondence with the height of the standard sample, and if the 1024 CCD cell is calibrated 1: 1 with the height of the standard sample 20 [mm], the actual shape is measured. In this case, if the laser beam is detected in cell 512, the vertical displacement of the hot-rolled steel sheet corresponds to 10 [mm].                     

The calculator unit 160 allows the laser beam in the center to be fixed at the center of the steel sheet width regardless of the width of the steel sheet, and the remaining laser beams 140 are both edges of the hot-rolled steel sheet (points 25 mm from the edge). Allow light to be emitted at both quarters (ie 4/1 and 4/3 of the width).

In this case, the angle of the beam path mirror 121 is calculated by Equation 1 (tan θ = ℓ / h) in order to determine the measuring point of the edge and the quiter, and then the angle is adjusted.

When the angle is determined according to Equation 1, the path of the laser beam 140 will be described with reference to FIG. 11. When the hot rolled steel sheet is flat, laser light is generated from the laser generator 130 to fix the mirror 129. The laser beam is reflected by the beam pass mirror 121 and hit the hot rolled steel sheet 10a and then received by the camera along the first path 140a in the beam pass mirror 121 on the camera box side. If the shape is poor, such as a hot rolled steel sheet shown by reference numeral 10a of FIG. 11, the laser beam 140 is received by the CCD camera along the second path 140b.

Therefore, the calculator 160 calculates the vertical displacement of the hot-rolled steel sheet by calculating the cell number detected by the CCD camera 155 inside the camera. The calculator calculates the cell signals of the 1024 CCD cameras 155 inside the camera unit to improve the accuracy of measurement and the reliability of the results. The cell numbers 1, (1 + 2) / 2, 2, (2 + 3) / 2, 3,… The signal is rearranged in the order of 1024 and expanded like 2048 cells to process the signal.

When the vertical displacement of each measurement point is calculated, the length of the hot rolled steel sheet per unit time is calculated using Equation 2.                     

The length of the hot rolled steel sheet measured and calculated as described above is referred to as L1 (left edge), L2 (4/1 point width), L3 (right center), L4 (3/4 point width), and L5 (right edge), Each length divided by L3 is multiplied by 10 ⁵ to represent the shape data I-unit, and the shape signal is transmitted to the host computer for display and feedback control on the driver's screen.

According to the present invention, even when the width of the steel sheet is changed by changing the path of the laser light by using a laser beam path mirror to measure the shape, there is no driving device and no measurement error occurs. By directly detecting the vertical displacement of the steel sheet, the same measurement accuracy is always maintained without being affected by the external environment and mechanical effects, and the hot rolled steel sheet is optimally rolled up by feeding back the quality improvement and the measurement result of the hot rolled steel sheet.

Claims (4)

In shape measuring device of hot rolled steel sheet Maintaining a pressure higher than atmospheric pressure and installed on the upper part of the table roll, the two sensor boxes for accommodating the laser generator unit, the camera unit and the mirror unit are fixed to both sides of the inside to change the path of the laser beam by adjusting the angle of the mirror unit. And gauge room unit for measuring the shape of the hot-rolled steel sheet; The shape of the hot rolled steel sheet is electrically connected between the gauge room part and the rolling mill, and calculates the measurement position of the hot rolled steel sheet and the angle of the mirror part according to the width size, and applies a signal detected by the camera part of the gauge room part to a specified equation. Apparatus for measuring the shape of the hot rolled steel sheet, characterized in that it is composed of a computing unit for transmitting the data to the host computer or directly to control the rolling mill to calculate the data using the operation results. The method of claim 1, wherein the gauge room unit, An air piping connected to provide a pressure higher than atmospheric pressure; It consists of two sensor boxes which are installed on both sides with a predetermined interval spaced around the table roll, Each sensor box, A plurality of laser boxes each having a laser generator for generating a laser beam; A plurality of camera boxes each containing a camera for detecting a laser beam; Apparatus for measuring the shape of a hot rolled steel sheet, characterized in that it comprises a mirror for precisely controlling and changing the path of the laser beam. The method of claim 1 or 2, wherein the mirror unit, A beam pass mirror for reflecting laser light; A fixing plate attaching the beam path mirror; A worm wheel for rotating the fixed plate; Bearings and worms for supporting and rotating the worm wheels; A motor for powering the worm; A rotary encoder for accurately counting the rotation speed of the motor; A gear box for firmly supporting each element and accommodating gears therein; Shaped device of the hot rolled steel sheet characterized in that it is fixed to the beam path mirror facing each other is configured to change the path of the laser. The method of claim 1, wherein the calculator unit, tanθ = ℓ / h (where θ is the angle of the beam path mirror, ℓ is the horizontal distance between the laser generator section (or camera section) and the measuring point, h is the laser generator section (or camera section) Vertical distance) to calculate the angle of the mirror,

Where L is the length of the hot rolled steel, Yi is the vertical displacement of the hot rolled steel, Vi is the speed of the hot rolled steel, Ti is the laser beam detection time, and n is the number of measurements for one integral time. Shape measuring apparatus for hot rolled steel sheet, characterized in that to calculate the data.

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