KR20040053509A - An apparatus for measuring the thickness of coil - Google Patents

Abstract

PURPOSE: A system for measuring thickness of coil is provided to judge whether coil that is produced is defective or not by measuring thickness of the coil using laser at the same time when the coil is produced. CONSTITUTION: The system comprises a reel action signal part(30) for outputting reel start signal when rotation of reel is started by sensing action of the reel and outputting reel stop signal when rotation of the reel is stopped; an operation terminal(40) comprising a displayer for outputting thickness of defective coil generated initially when strip is started to be coiled on the reel and outputting allowable strip thickness deviation value considering an error that can be generated in facility so that operator can check signals with the naked eye; a proximity sensor(7) installed on rotation shaft of the reel to output pulse signal according to the number of rotations of the reel; a distance measuring instrument(10) installed on a straight line with central point of the coil with being perpendicularly to tangent line of the coil to measure a distance from the distance measuring instrument to the surface of the coil; a distance calculator(21) for calculating coiling thickness of the coil except the defective coil thickness inputted from the operation terminal by receiving measured distance values of the distance measuring instrument if reel start signal is generated in the reel action signal part; a rotation number calculator(22) for counting pulse signal generated in the proximity sensor if reel start signal is generated in the reel action signal part, and calculating the number of rotations of the reel by stopping count if reel stop signal is generated in the reel action signal part; an average thickness calculator(23) connected to the distance calculator and the rotation number calculator to calculate average thickness of the strip by receiving coiling thickness and number of rotations of the coil from the distance calculator and the rotation number calculator respectively; and a defection decider(24) connected to the operation terminal to output warning signal to the operation terminal if average thickness values of the strip inputted from the average thickness calculator are deviated from an allowable deviation value of the operation terminal.

Description

Coil Thickness Measuring Equipment {AN APPARATUS FOR MEASURING THE THICKNESS OF COIL}

The present invention relates to an apparatus for measuring the thickness of a product produced in a cold rolling mill, and more particularly, to measure the thickness of the coil at the same time as the production using a laser and the thickness of the strip wound on the reel through the thickness of the coil By calculating the average thickness, if the strip is defective relates to a coil thickness measuring device that determines that the coil is also defective.

In general, the cold rolling process is to roll the coil in a continuous cold rolling mill at room temperature in order to match the transferred coil to the desired thickness of the consumer, the rolled coil is a variety of oil, iron and dust attached to the surface in the electric clean line Removed and improved to the shape of the plate through annealing and temper rolling.

The thickness of the coil produced in the cold rolling process of the steel mill was conventionally detected through the thickness of the strip in which the coil was released, and the thickness of the strip was measured by emitting the X-ray from the X-ray thickness meter to the strip. The AGC (Automatic Gauge Control) system receives the measured value of the X-ray thickness meter and controls the roll loading of the continuous cold rolling mill so that the thickness of the strip is constant to maintain the thickness of the strip.

However, in the conventional X-ray thickness gauge, if foreign matter is attached to the point of the strip from which the X-ray is emitted, the foreign material is also mistaken for the strip, and the thickness of the strip thicker than the thickness of the actual strip is transmitted to the AGC system. Thus, the AGC system increases the roll loading of the cold rolling mill in order to make the thickness of the strip constant and the increased roll loading further rolls the strip so that the thickness of the strip becomes thinner than the average. That is, the X-ray thickness meter has a problem that it is not possible to distinguish the strip and the foreign matter to measure the thickness of the correct strip.

In this way, in order for the operator to detect that a defective product is produced in which the thickness of the strip is not constant while the equipment is in progress, the operator must take an actual specimen and measure the thickness of the strip by micrometer. However, there is a problem in that the failure of the sample can be taken during the installation of the equipment, the driver can not detect the failure of the strip during the installation of the equipment can be produced a large amount of defective products of the coil.

The present invention is to solve the above problems, the purpose is to determine the failure of the coil produced in the cold rolling process, using a laser thickness meter to measure the thickness of the coil at the same time the coil is released form By calculating the average thickness of the in-strip, it relates to a coil thickness measuring apparatus for determining whether the thickness of the strip is outside the deviation allowance applied to the equipment to inform the driver of the failure of the coil.

1 is a block diagram of a coil thickness measuring apparatus according to the present invention.

Figure 2 is a schematic diagram for explaining the principle of measuring the thickness of the coil according to the present invention.

* Description of the symbols for the main parts of the drawings *

7: proximity sensor

10: rangefinder

21: distance calculator

22: speed calculator

23: average thickness calculator

24: Bad or not

30: reel operation signal unit

40: operating terminal

Apparatus according to the present invention is a coil thickness measuring apparatus in which a strip is wound on a reel in a cold rolling process of a steel mill,

A reel operation signal unit for detecting a reel operation and outputting a reel start signal when the reel starts to rotate, and outputting a reel stop signal when the reel stops;

Outputs the defective thickness (A) of the coil that occurs at the beginning of the winding of the strip to the reel, outputs the tolerance of the thickness of the strip in consideration of errors that may occur in the facility, and the driver can visually check the signal An operation terminal having a display device;

A proximity sensor installed on the rotation shaft of the reel and outputting a pulse signal according to the rotation speed of the reel;

A distance meter perpendicular to the tangent of the coil and installed in a line with the center point of the coil to measure a distance to the coil surface;

A distance calculator for receiving a measurement distance of the distance measuring device when the reel start signal is generated from the reel operation signal unit and calculating a coiling thickness H of the coil excluding the defective thickness A of the coil input from the operation terminal;

When the reel start signal is generated in the reel operation signal unit, the pulse signal generated by the proximity sensor is counted. When the reel stop signal is generated in the reel operation signal unit, the count is stopped to calculate the number of revolutions (Turn) of the reel. Rotational speed calculator;

An average thickness calculator connected to the distance calculator and the rotation speed calculator to calculate the average thickness of the strip by receiving the coil winding thickness H and the rotation speed of the reel 1 from each other; And

A defective / non-terminal which is connected to the operation terminal and outputs an alarm signal to the operation terminal when the average thickness of the strip inputted from the average thickness calculator is outside the allowable deviation of the operation terminal;

Characterized in having a.

Hereinafter, the coil thickness measuring apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram of a coil thickness measuring apparatus according to the present invention. Referring to FIG. 1, the apparatus of the present invention detects the operation of the reel 1 and starts a reel start signal when rotation of the reel 1 starts. And a reel operation signal unit 30 for outputting a reel stop signal when the rotation of the reel 1 is stopped, and a failure of the coil 3 generated at an initial stage when the strip 2 starts to be wound on the reel. An operation terminal 40 having a display device for outputting the thickness A, outputting the allowable deviation of the thickness of the strip 2 in consideration of errors that may occur in the facility, and allowing a driver to check the signal with the naked eye; Proximity sensor (7) installed on the rotating shaft of the reel (1) for outputting a pulse signal according to the number of revolutions of the reel (1), perpendicular to the tangent of the coil (3) and in line with the center point of the coil (3) A distance measuring device 10 mounted on the coil and measuring the distance to the surface of the coil 3, and the reel operation signal When the reel start signal is generated in the unit 30, the measurement distance of the distance measuring device 10 is received and the coil 3 is wound up except the defective thickness A of the coil 3 input from the operation terminal 40. When the reel start signal is generated by the distance calculator 21 for calculating the thickness H and the reel operation signal unit 30, the pulse signal generated by the proximity sensor 7 is counted, and the reel operation signal unit ( 30 is connected to the rotation speed calculator 22 which stops counting and calculates the rotation speed of the reel 1 when the release stop signal is generated, and the distance calculator 21 and the rotation speed calculator 22. And an average thickness calculator 23 for calculating the average thickness of the strip 2 by receiving the winding thickness H and the rotation speed of the coil 3 from each other, and the operation terminal 40 and The average thickness (Thick) of the strip (2) inputted from the average thickness calculator 23 is connected to each other, the deviation of the operation terminal 40 If there is a deviation from the threshold comprises a failure-free judging device 24 for outputting an alarm signal to the operation terminal (40).

Figure 2 is a schematic diagram for explaining the principle of measuring the thickness of the coil according to the present invention, with reference to Figure 2, the operation of the device configured as shown in Figure 1 will be described.

At the portion where the strip 2 begins to be wound on the reel 1, the coil 3 has a defective thickness A generated when the strip 2 is rolled, and the operation terminal 40 has the distance calculator. The output of the thickness (A) generated in the rolling of the equipment to (21) in advance, and in order to detect the presence or absence of the failure of the strip (2) of the strip (2) applied to the equipment with the defective or non-determining machine (24) Output thickness deviation tolerance.

The range finder 10 is a device for measuring the distance from the range finder 10 to the coil 3 by using a laser, the installation position of the range finder 10 is in tangent to the coil (3) It is parallel with the center point of the coil 3 perpendicularly. The winding thickness H of the coil 3 calculated by the distance calculator 21 is calculated by using the measurement distances input from the distance measurer 10, through the thickness measurement principle of the coil shown in FIG. It is explained.

A reel-start signal is input from the reel operation signal unit 30, and the coil 3 is wound around the reel 1 by a defective length A input from the external operation CRT 40. If so, the measured distance measured by the range finder 10 is then stored as a distance value H1 at the start point of the distance calculator 21. In addition, when a re-stop pulse signal is input from the reel operation signal unit 30, the measured distance measured by the distance measurer 10 at that time is the distance value Hn at the end of the distance calculator 21. ) Is entered. Therefore, the winding thickness H of the coil 3 calculated by the distance calculator 21 is calculated by Equation 1 below.

[Equation 1]

H = H1-Hn

H: winding thickness of coil [mm]

H1: Distance value at the beginning of coil winding excluding bad length (A) [mm]

Hn: Distance value [mm] at the end of coil winding

The winding thickness H of the coil 3 calculated by Equation 1 in the distance calculator 21 is output to the average thickness calculator 23.

The rotation speed detector 7 outputs a pulse signal corresponding to the rotation speed of the reel 1. When the reel start signal is input from the reel operation signal unit 30, the rotation speed calculator 22 rotates the rotation. When the rising edge of the pulse signal of the water detector 7 starts to be counted, and the release stop signal is input from the reel operation signal unit 30, the rotation speed calculator 22 causes the pulse signal of the rotation speed detector 7 to start counting. The number of revolutions (Turn) of the reel (1), which is the value obtained by counting, is output to the average thickness calculator (23).

The average thickness calculator 23 receives the winding thickness H of the coil 3 of the distance calculator 21 and the rotation speed Turn of the reel 1 of the rotation speed calculator 23. Calculate the average thickness of 2). The average thickness of the strip 2 may be calculated by Equation 2 below.

[Equation 2]

Thick = H / Turn

Thick: average thickness of the strip [mm]

Turn: Reel Speed

H: winding thickness of coil [mm]

For example, if the number of revolutions (Turn) of the reel (1) is 1000 times and the winding thickness (H) of the coil (3) is 500 [mm], the average thickness (Thick) of the strip (2) is 500 mm / 1000 = 0.5mm.

In this case, the error B generated in the space between the strip 2 and the space between the surfaces is very small, but in order to reduce the range of error that increases as the number of revolutions of the reel 1 increases, The error value generated by winding the strip 2 once is multiplied by the average thickness of the strip 2. The average thickness Thick2 of the strip 2 in which the error B is compensated for may be calculated by Equation 3 below.

[Equation 3]

Thick2 = H / Turn-Turn × B

Thick2: Average thickness of the strips with error B compensated [mm]

H: winding thickness of coil [mm]

Turn: Reel Speed

B: Error between the face and the face of the wound strip [mm]

The distance calculator 21 and the rotation speed calculator 22 have a winding thickness H of the coil 2 and the rotation speed of the reel 1 until a reel stop signal is input from the reel operation signal unit 30. Since (Turn) is calculated repeatedly, the average thickness of the strip 2 can be calculated in real time.

In addition, the average thickness (Thick) of the strip (2) of the average thickness calculator 23 in the defect determination unit 24 is compared with the deviation allowance input from the operation terminal 40, the strip (2) If the average thickness of the deviation (Trick) is out of the allowable deviation, the defective presence or absence determiner 24 outputs an alarm signal to the operation terminal 40, the driver through the alarm signal to the thickness of the coil according to the equipment or strip You can detect that a problem has occurred.

The present invention is to calculate the average thickness of the product being produced by comparing the final thickness of the produced product and the average thickness by alerting the driver when the final thickness is out of the allowable deviation of the average thickness, thickness gauge is abnormally operated It detects the thickness defect of the product in advance and prevents the loss caused by mass production.

Claims (4)

In the coil thickness measuring apparatus formed by winding multiple strips on a reel in a cold rolling process of an ironworks, A reel operation signal unit 30 which detects the operation of the reel and outputs a reel start signal when the reel starts to rotate, and outputs a reel stop signal when the reel stops; Outputs the defective thickness (A) of the coil generated in the early stage when the strip begins to be wound on the reel, outputs the deviation allowance of the strip thickness in consideration of the error that may occur in the facility, and the driver can visually check the signal Operation terminal 40 having a display device; A proximity sensor (7) installed on the rotating shaft of the reel to output a pulse signal according to the number of revolutions of the reel; A distance measurer 10 perpendicular to the tangent of the coil and installed in a line with the center point of the coil to measure a distance to the coil surface; When the reel start signal is generated in the reel operation signal unit 30, the winding distance of the coil is received except for the defective thickness A of the coil inputted from the operation terminal 40 by receiving the measurement distance of the distance measuring device 10. A distance calculator 21 for calculating H); When the reel start signal is generated in the reel operation signal unit 30, the pulse signal generated by the proximity sensor 7 is counted. When the reel stop signal is generated in the reel operation signal unit 30, the count is stopped and the A rotation speed calculator 22 for calculating a rotation speed of the reel; An average thickness calculator 23 connected to the distance calculator 21 and the rotation speed calculator 22 to calculate the average thickness of the strip by receiving the coil winding thickness H and the rotation speed from each of the coils; ; And When the average thickness (Thick) of the strip input from the average thickness calculator 23 is interconnected with the operation terminal 40 is out of the allowable deviation of the operation terminal 40, an alarm signal is sent to the operation terminal 40. A defective or not judging device 24 for outputting; Apparatus for measuring the thickness of a coil comprising: a. The method of claim 1, wherein the distance calculator 21 The actual height (H) of the coil wound on the reel is H = H1-Hn (H: actual height [mm] of coil, H1: distance value [mm], starting point of coil winding excluding defective thickness (A), Hn) : Coil thickness measuring device, characterized in that it is calculated by the distance value [mm] at the end of coil winding. The method of claim 1, wherein the average thickness calculator 23 The average thickness of the coil is calculated by Thick = H / Turn (Thick: average thickness of the coil [mm], Turn: number of revolutions of the reel, H: actual height of the coil [mm]) Coil thickness measuring device. The method of claim 1, wherein the average thickness calculator 23 Thick2 = H / Turn-Turn × B (Thick2: error (B) is compensated for the average thickness (Thick2) of the coil to compensate for the slight error (B) generated between the surface of the strip wound on the reel Coil thickness, in mm, H: winding thickness of coil [mm], Turn: number of revolutions of reel, B: error between the surface of wound strip [mm]) Thickness measuring device.