KR100930469B1 - Tension meter zeroing device and method of continuous annealing furnace - Google Patents

Abstract

The present invention relates to a device and method for a continuous annealing tension meter zeroing apparatus, which allows the tension meter zeroing to be carried out by remote control without stopping the line, lowering the temperature, and removing strips, thereby making it more difficult and safer according to the tension meter zeroing. It eliminates the risk of accidents and decreases productivity, and zero-tensions installed on the inside and outside of the furnace on-line or off-line, which enables accurate tension control and improves the quality of the product. This greatly reduces the time spent on zeroing.

To this end, the present invention is to install a zeroing roll that can lift the strip before and after the tension meter roll installed in the cold rolling or plating line furnace, and to install the cylinder on the left and right sides of the zeroing roll to strip the tension meter roll to the cylinder Tension meter zeroing device of continuous annealing furnace which compensates the change of tension by electric controller by detecting the change of length of strip by pulse generator of cylinder while lifting the zeroing roll up to the position which is not in contact with the line speed. Provide a method.

Description

ZEROING APPARATUS AND METHOD FOR TENSION METER ON CONTINUOUS ANNEALING LINE}

1 is an exemplary configuration of a tension control system of a conventional continuous annealing furnace

2 is an overall configuration diagram of a tension meter zeroing apparatus of a continuous annealing furnace according to an embodiment of the present invention

3 is a front view of the strip elevating / transporting means of FIG.

4 is a side view of the strip lift / transfer means of FIG. 2 when the strip is pushed up;

FIG. 5 is a tension compensation control block diagram implementing a tension compensation control flow programmed in the electric controller of FIG.

Figure 6 is a tension meter zeroing operation flow chart according to an embodiment of the present invention

FIG. 7 is a flowchart illustrating a tension compensation operation that is interlocked when the tension meter on / offline zeroing of FIG.

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

5a: tension control unit 10a: electric controller

100: tension meter zeroing means 200: strip lifting / transport means

The present invention is to install a zeroing roll that can lift the strip (STRIP) under the tension meter roll (ZEROING) for the zeroing of the tension meter (TENSION METER) installed in cold rolling or plating line furnace (FURNACE) The cylinder is installed on the left and right sides of the zeroing roll, and when the tension meter is zeroed, the zeroing roll is lifted up to the position where the strip does not contact the tension meter roll in synchronism with the line speed. The present invention relates to a tension meter zeroing device of a continuous annealing furnace that detects a generator and compensates for a change in tension in a PLC.

In general, a tension meter installed in a cold rolled or plated line furnace applies an appropriate tension to the strip so that the strip traveling inside and outside the furnace does not meander in the furnace. The tension of the strip by the tension meter is controlled by a cold rolled or plated line. It is essential to the continuous annealing furnace.

Therefore, the continuous annealing furnace is generally provided with each tension meter for each section (Section), the shear line around the second bridle roll controls the speed of all group rolls of the tension meter, the second bridle The trailing line centered on the roll controls the tension of the strip by controlling the speed of the subsequent group rolls of the tension meter.

A configuration example for tension control of the strip is illustrated in the detailed view of FIG. As illustrated in FIG. 1, a tension control system of a conventional continuous annealing furnace is installed at a lower portion of a tension meter, and load cell 6 which detects a load change applied to the tension meter roll 8, and supplies current to the load cell. Tension meter control unit 5 for amplifying and rectifying the micro voltage generated in the load cell and converting it into a tension value, and a plurality of helper rolls and bridle rolls driven inside the furnace by controlling the output frequency by varying the input voltage. It comprises a motor controller 9 for controlling the rolls and an electric controller 10 composed of a programmable logic controller (PLC).

The load cell 6 installed below the tension meter has a mechanical zero point, and the zero point change occurs due to a change in the tension of the strip, a mechanical load and a temperature change of the roll, and the like. The zero point change of the load cell adversely affects the tension control of the strip, leading to problems such as product defects and breakage.

Therefore, zeroing of the tension meter should be performed. In order to zero the tension meter, the strip (2) over the tension meter roll (8) inside the furnace had to be removed.

In the conventional tension meter zeroing method, in order to remove the strip covering the tension meter roll, first, the line is stopped to lower the high temperature (about 900 ° C.) to the room temperature (about 30 ° C.). After that, when the furnace temperature drops to room temperature, the furnace gas (BUNGS) 1 under the furnace wall 4 should be opened to replace the atmosphere gas (H, N) in the furnace with the atmosphere. After cutting to remove (CUT), the tension meter zeroing is performed in a state where the strip 2 is not in contact with the tension meter roll 8.                         

However, such a conventional tension meter zeroing operation requires an excessive time of at least 24 hours due to the line stop and the high temperature low temperature drop, and the like, and the atmosphere is not properly replaced by the atmosphere during the strip removal process. When working in the state, there was a risk of a safety accident such as gas suffocation and falling.

Of course, in the case of the tension meter installed outside the furnace, it is not necessary to lower the temperature and replace the atmosphere gas (H, N), but to remove the strip so that the strip does not contact the tension meter roll by stopping the line and cutting the strip. In this case, zeroing of the tension meter was a lot of trouble because the back still remains an essential task.

Accordingly, the present invention has been made to solve the above problems, and the first object of the present invention is to provide an on-line tension meter without stopping the line, lowering the furnace temperature, replacing the atmosphere in the furnace atmosphere, and removing the strip. Another aspect of the present invention is to provide a tension meter zeroing apparatus and method for a continuous annealing furnace that can be zeroed off-line.

In addition, the second object of the present invention is to zero the tension meter on-line (off-line) or off-line (off line) without stopping the line, lowering the temperature, atmospheric replacement of the atmosphere gas in the furnace and strip removal, the tension The present invention provides a tension meter zeroing device and a method of a continuous annealing furnace which can automatically compensate the tension of the front and rear ends of the tension meter by changing the length of the strip according to the meter zeroing.

In order to achieve the first object of the present invention, in the tension meter zeroing apparatus of a continuous annealing furnace, the strips that extend across the tension meter roll of the continuous annealing furnace are respectively supported at the front and rear ends of the tension meter roll and pushed upwards. Strip elevating / transporting means for raising or returning to the original position and transferring the strip synchronized with the strip traveling speed of the continuous annealing furnace; Remotely control the strip lifting / transporting means to push the strip upwards to a position that is not in contact with the tension meter roll, and then perform the tension meter zeroing, and remotely control the strip lifting / transportation means after zeroing the tension meter. To provide a tension meter zeroing apparatus of a continuous annealing furnace including tension meter zeroing means for returning the strip to its original position.

In addition, in order to achieve the first object, the present invention, in the tension meter zeroing method of the continuous annealing furnace, each of the zeroing means that the lifting and rotating operation is remotely controlled before and after the tension meter roll of the continuous annealing furnace, respectively Installing; Driving the zeroing means to push the strip over the tension meter roll upwards to a first predetermined position not in contact with the tension meter roll; Performing the tension meter zeroing; And driving the zeroing means again after zeroing the tension meter to return the strip to its original position.

In order to achieve the second object of the present invention, in the tension meter zeroing apparatus of a continuous annealing furnace, the strips extending over the tension meter roll of the continuous annealing furnace are respectively supported at the front end and the rear end of the tension meter roll and pushed upwards. Strip elevating / transporting means for raising or returning to the original position and transferring the strip synchronized with the strip traveling speed of the continuous annealing furnace; Remotely control the strip lifting / transporting means to push the strip upwards to a position that is not in contact with the tension meter roll, and then perform the tension meter zeroing, and remotely control the strip lifting / transportation means after zeroing the tension meter. Returning the strip to its original position, the tension meter zeroing apparatus of the continuous annealing furnace including a tension meter zeroing means for automatically detecting the tension of the front and rear ends of the tension meter by detecting the change in the length of the strip according to the tension meter zeroing To provide.

Further, the present invention includes the respective processing steps of the method of the present invention for achieving the first object in order to achieve the second object, and furthermore, the continuous annealing before pushing the strip to the first set position. Determining whether the furnace is in a line operating state and synchronizing the zeroing means at the line operating speed; By detecting the length change of the strip according to the tension meter zeroing as the height change amount of the zeroing means to calculate the tension compensation values of the front and rear ends of the tension meter roll, the respective tension compensation values before and after the tension meter It provides a tension meter zeroing method further comprising a processing step of compensating for the tension.

These 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.                     

Figure 2 is an overall configuration diagram of a tension meter zeroing device of a continuous annealing furnace according to the present invention, showing a preferred embodiment of the device capable of achieving the first and second purposes of the present invention.

As shown in FIG. 3, the present invention supports the strips 2 extending over the tension meter rolls of the continuous annealing furnace at the front and rear ends of the tension meter rolls 8, respectively, and pushes them upwards or to their original positions. A strip lifting / transporting means (100) for returning and transferring the strip pushed upwards at the same speed as the strip traveling speed of the continuous annealing furnace, and remotely controlling the strip lifting / transporting means to tension the strip. The tension meter zeroing is performed after pushing upward to a position not in contact with the meter roll, and after the tension meter zeroing, the strip elevating / transporting means is remotely controlled to return the strip to its original position, and further, the tension meter zeroing. Tension meter zeroing means 200 for automatically detecting the tension before and after the tension meter by detecting the change in the length of the strip according to It is configured to include.

3 and 4 respectively illustrate a front view of the strip lift / transfer means for FIG. 2 and a side view when the strip lift / transfer means push up the strip.

As shown in FIGS. 3 and 4, the strip lift / transfer means 100 can push the strips across the tension meter roll upwards or back to their original positions before and after the tension meter. Two zeroing rolls (11a) (11b) and the two ends of the zeroing roll is installed so as to be able to move up and down, rotatably installed in each of the front and rear ends of the tension meter roll in the same direction as the traveling direction of the strip. A plurality of cylinders 18a-18d each provided at each of the variable heights of the zeroing rolls, a plurality of pulse generators 19a-19d respectively detecting height variations of the cylinders and transmitting the detected changes to the tension meter zeroing means; And servo valves 21a and 21b and hydraulic pumps 22a and 22b for opening and closing the hydraulic circuit of the cylinder by a control signal supplied from the tension meter zeroing means. It can be implemented as a preferred embodiment of the device to more effectively achieve the first and second purposes.

In addition, the strip elevating / transporting means 100 is a zeroing roll motor 14, a universal joint 12, a speed reducer 13, which is a power aid for driving a tension meter zeroing roll, as shown in the front view of FIG. ), Bellows (4a) (4b), bearing block (15) zeroing roll base (20), pulse generator wire (17), cylinder shaft (16), etc. to suppress the release of the atmosphere gas during the rise and fall of the zeroing roll. It is configured to include more.

In order to more effectively achieve the first and second purposes, the tension meter zeroing means 200 includes a zeroing switch 31 for selecting whether or not to zero the tension meter, and a lower portion of the tension meter. A tension meter control unit 5a for supplying a current to the installed load cell to calculate the tension of the strip across the tension meter roll by changing the voltage of the load cell, and outputting a value for the tension control, and by the zeroing switch Remote control of the transfer operation and the lifting operation of the strip lifting / transporting means according to the line operation state of the continuous annealing furnace (On-line control is illustrated in the drawing, but off-line control using wireless control means is also possible. In the following description, the tension meter is zeroed, and the tension meter is zero. After controlling the tension of the strip running the continuous annealing furnace by varying the rotational speed of the electric controller (10a) to perform a series of control process for driving the tension meter zeroing means to return to the original position again And a second motor driving device 32 for varying the rotational speed of the zeroing roll and synchronizing with the line operating speed of the continuous annealing furnace.

Here, the tension meter zeroing means 200 is preferably configured to selectively control the transfer operation of the strip lifting / transporting means in the line operating state of the continuous annealing furnace, and more particularly, to effectively serve the second purpose. To achieve this, after the tension meter zeroing, the strip elevating / transporting means is controlled again to return the strip to its original position, and then the tension compensation value before and after the tension meter roll is calculated using the length change amount of the strip according to the tension meter zeroing. It is preferable to configure so as to control the tension of the strip.

To this end, the electric controller 10a is a procedure for starting by the zeroing switch, a procedure for controlling the transfer operation and the lifting operation of the strip lifting / transporting means according to the line operation state of the continuous annealing furnace, and zeroing of the tension meter. And a step of calculating the tension compensation values at the front and rear ends of the tension meter roll by the amount of change in the length of the strip according to the lifting and lowering action of the strip lifting / transporting means during the zeroing of the tension meter. A process for compensating for tension, and controlling the tension of the strip across the tension meter roll by controlling the number of rotations of the tension control rolls located at the front and rear ends of the tension meter roll with the tension control value output from the tension meter control unit. It is preferable that a programmable logic controller (PLC) is implemented to have a series of processing procedures. .

5 illustrates an example of an internal circuit block diagram of an electrical controller in which the apparatus of the present invention configured as described above is programmed to perform the above processing procedures.

As illustrated in FIG. 5, the electric controller 10a adjusts the tension on the tension adjusting rolls 7a and 7b before and after the tension meter by using the output of the tension meter control unit 5a when the tension control switch is turned on. The counters 41 and 51, the comparators 42 and 52, the bands 43 and 53, the integrators 44 and 54, the buffers BUF1 and BUE2 and the adders 45 and 55, respectively, And a plurality of pulse counters 61 and 62 and adders, which include limiters 46 and 56, which detect a change in height of the cylinder from the output of the pulse generator when the tension control switch is turned off, and calculate a tension compensation value when the tension meter is zeroed. 63) and a divider 64, a differentiator 65, a plurality of multipliers 66-69, a zeroing flag (ZF), a cylinder up flag (CUF) and a cylinder down flag (CDF), the tension control switch off Buffers (BUF1, BUF2) for temporarily storing the immediately preceding tension value at the time and the tension at the time of the tension control switch on or off. Adders 45 and 55 for selectively outputting the tension control value of the rotor control unit or the tension compensation value calculated by the electric controller to the tension meter before and after the tension meter of the first motor drive device 9; It can be configured to include a limiter (46, 56) for limiting the output by a certain percentage, the internal circuit configuration of such an electrical controller can be modified by other types of circuit blocks, of course.

FIG. 6 illustrates a tension meter zeroing operation flow for performing the method of the present invention, and FIG. 7 illustrates a tension compensation operation flow programmed to be interlocked when the tension meter zeroing of FIG. 6 is performed.

The method of the present invention to achieve the first object and the second object basically comprises the step of installing each of the zeroing means for the tension meter zeroing before and after the tension meter roll of the continuous annealing furnace. In particular, the method of the present invention for achieving the first object is a step (101, 102) of checking the operation of the zeroing switch while driving the zeroing roll at low speed, as shown in FIG. Checking the line operation of the annealing furnace and synchronizing the zeroing means to the line operating speed or stopping the zeroing roll (103-106, 107), and turning off the tension control switch to drive the zeroing means. Step (108-112) to push the strip over the tension meter roll up to a first set position (for example, 550 mm) which is not in contact with the tension meter roll, and performing the tension meter zeroing (113). And returning the strip to its original position by turning on the zeroing means and turning on the tension control switch (114-119).

In addition, in order to achieve the second object, the method of the present invention, as shown in Fig. 7, is started at the same time as the tension control switch off to hold the previous tension control value in the buffer (201-202), and Calculating a tension compensation value of the front and rear ends of the tension meter roll by detecting the change in the length of the strip according to the tension meter zeroing as the height change amount of the zeroing means (203-207), and using the respective tension compensation values And compensating for the change in tension of the strip (208).                     

The tension meter on / offline zeroing apparatus and method of the continuous annealing furnace according to the present invention configured as described above will be described with reference to FIGS. 2 to 7.

First, during normal operation of the continuous annealing furnace, the zeroing rolls 11a and 11b operate 102 at a low speed according to a predetermined rotation speed to prevent bending. Then, when the driver presses the tension meter zeroing switch 31 to perform the tension meter zeroing, the zeroing switch is turned on, and the electric controller 10a checks (101) the state and starts the tension meter zeroing program of FIG. 6. Let's do it. When the program is started as described above, the electric controller 10a first determines (103) whether the line of the continuous annealing furnace is normally operating or stopped. As a result of the determination, if the line is stopped, the zeroing rolls 11a and 11b are stopped 107. If the line is in normal operation, the zeroing rolls 11a and 11b are accelerated through the second motor driving device 32. 104) then the zeroing flag is turned on 105 and the speed of the zeroing roll is accelerated until the two speeds are synchronized while comparing 106 the speed of the zeroing roll and the line speed.

Then, the electric controller 10a turns off the tension control switch 108 to start the tension compensation program as shown in FIG. 7, and also sets the height of the initial cylinder to a predetermined value (in the present invention, the case of 5MM is set as an example. However, this value can be changed in some cases) to start the position control of the cylinder, and at the same time turn on the cylinder rise flag (CUF). Accordingly, the electric controller 10a operates the hydraulic pumps 22a and 22b and sends control outputs to the servo valves 21a and 21b so as to be below the zeroing rolls 11a and 11b provided at the front and rear ends of the tension meter roll 3. The piston of the cylinder 18a-18d is raised. After that, a predetermined time (which is set to 2 seconds in the present invention will be described as an example, but this value can be changed as the case may be) is determined. The height of the cylinder can be adjusted by the tension meter zero (112 in the present invention) when the height of the cylinder is set to 550 mm as the height of the strip does not contact the tension meter roll. For example, this value can also be changed depending on the case).

When the strip is stretched to the set height through the control process and no longer extends over the tension meter roll, the tension meter zeroing is performed in the state (113).

After this, the predetermined time (in the present invention, the case is set to 3 seconds as an example, but this value can also be changed depending on the case) After waiting 114, turn off the cylinder rising flag (CUF) and turn on the cylinder falling flag (CDF) Each time 3 seconds elapses (116), the cylinder height CHS (t) is changed to CHS (t) = CHS (t-1)-5 (117). The check is repeated 118 until the height of the cylinder returns to its original position (down to 0 mm).

When the strip is applied to the tension meter roll again through the above control process, both the cylinder rising flag (CUF) and the cylinder falling flag (CDF) are turned off and the tension control switch is turned on (119). After the tension control operation can be resumed, the tension meter zeroing operation is terminated.

On the other hand, the tension compensation operation according to the up / down of the cylinder to be started simultaneously with the tension control switch off is performed in the state that the tension meter zero switch is on and the line is in normal operation, as shown in Figure 7, It is activated by controlling the tension meter control unit 5a in the electric controller 10a to turn 108 the tension control switch in the off state. When the tension control switch is turned off 201 with the start, the contact point of the tension control switch is opened as shown in the internal circuit block diagram of FIG. 5, and thus the tension compensation signal is stored in each buffer BUF1 and BUF2. 202). At the same time, the pulse values of the pulse generators 19a to 19d installed in the cylinder are converted to the heights of the cylinders by the pulse counters 61 and 62 of the electric controller 10a and then the heights of the two cylinders in the adder 63. The value is added and divided by two in the divider 64. The divided value is calculated and outputted as ΔH (cylinder height change) = H (t)-H (t-1) by the calculator 65, and is multiplied by the cylinder rising and falling in the multiplier 66 again. The zero-tension compensation factor K for removing the generated loop is multiplied and output. The output value of the multiplier 66 is calculated as TZC =? H * K when the zeroing flag ZF is "1", and TZC = 0 when the zeroing flag ZF is 0 (203). )do.

When the cylinder is raised to reach the tension meter zeroing position, the electrical controller 10a checks the states of the cylinder rising flag CUF and the cylinder falling flag CDF (204, 206). At this time, since the cylinder rising flag CUF is turned on and the cylinder falling flag CDF is turned off, the zero tension compensation value TZC is passed in the multiplier 67 and + by the adder 45 and the limiter 46. It is limited to -10% and output as the tension compensation value (+ TZC) of the zeroing tension meter shear group (HS tension compensation reference), and also multiplied by -1 in the multiplier 68 to become -TZC and the multiplier 69 passes. And is limited to ± 10% by the adder 55 and the limiter 56, and output 205 to the tension compensation value (-TZC) of the zero tension meter rear end group (SS tension compensation reference) to drive the tension control roll ( 208, the electrical controller 10a is able to impart a suitable loop by such tension compensation as the cylinder is accelerated for lift.

On the other hand, when the cylinder returns to the tension meter zeroing position and zeroing is performed, the cylinder origin return is performed, and the electric controller 10a checks the state of the cylinder rising flag CUF and the cylinder falling flag CDF ( 204, 206). At this time, since the cylinder rising flag CUF is turned off and the cylinder falling flag CDF is turned on, the zero tension compensation value TZC is multiplied by 0 in the multiplier 67, and the zero tension meter shear group (HS tension compensation). Reference) to 0, and multiplier 68 multiplies -1 to -TZC and multiplier 69 multiplies -2 to 2TZC to add ± 10 by adder 55 and limiter 56. Since it is limited to%, each output 207 is output to the tension compensation value (2TZC) of the zero tension meter rear end group (SS tension compensation reference) to drive the tension control roll 208, so that the electric controller 10a lowers the cylinder. When it is decelerated for the above, it is possible to give an appropriate loop by the above tension compensation.

When the cylinder reaches the home position, the electric controller 10a turns on the tension control switch of the corresponding tension control system (see step 119 of FIG. 6) at the same time as the cylinder rising flag and the falling flag off, so that the tension control system by the tension meter is normally operated. It is formed and the tension compensation program as shown in FIG. 7 is terminated so that tension control according to the cylinder height change amount is no longer performed.

According to the present invention as described above, by greatly improving the tension meter zeroing method by the line stop, low temperature drop, and strip removal to eliminate the hassle and risk of safety accident and productivity degradation caused by tension meter zeroing In addition, it is possible to zero-tension the tension meter installed on the inside or outside of the furnace either on-line or off-line, so it is possible to improve the quality of the product by precise tension control and to improve the time spent on zeroing the internal tension meter. There are various advantages, such as being significantly shortened.

Claims (11)

In the tension meter zeroing device of the continuous annealing furnace, The strips that span the tension meter rolls of the continuous annealing furnace are supported at the front and rear ends of the tension meter rolls, respectively, and are pushed upwards or returned to their original positions, and the strips are synchronized with the strip traveling speed of the continuous annealing furnace. Strip lifting / transporting means; Remotely control the strip lifting / transporting means to push the strip upwards to a position that is not in contact with the tension meter roll, and then perform the tension meter zeroing, and remotely control the strip lifting / transportation means after zeroing the tension meter. And a tension meter zeroing means for returning the strip to its original position. The tension meter zeroing means, A zeroing switch for selecting whether or not to zero the tension meter; A tension meter control unit for supplying a current to a load cell installed under the tension meter, calculating a tension of the strip across the tension meter roll by a change in voltage of the load cell, and outputting a value for controlling the tension; The tension meter is operated by the zeroing switch and performs the zeroing of the tension meter while controlling the transfer operation and the lifting operation of the strip lifting / transporting means according to the line operation state of the continuous annealing furnace, and the tension control output from the tension meter control unit. An electric controller for controlling the tension of the strip across the tension meter roll by controlling the number of revolutions of the tension adjusting roll located at the front and rear ends of the tension meter roll with a value; A first motor driving device for controlling the tension of the strip traveling through the continuous annealing path by variably controlling the rotation speed of the tension adjusting roll; And a second motor driving device configured to variably control the rotational speed of the zeroing roll to match the line operating speed of the continuous annealing furnace. According to claim 1, wherein the tension meter zeroing means, And a tension meter zeroing device for a continuous annealing furnace, characterized in that the transfer operation of the strip lifting / transporting means is selectively controlled in a line operating state of the continuous annealing furnace. The method of claim 1 or claim 2, wherein the strip lift / transfer means, The strip extending over the tension meter roll is installed to be elevated to return upward or to the original position at each of the front and rear ends of the tension meter, and the driving direction of the strip at each of the front and rear ends of the tension meter roll. Zeroing roll is rotatably installed in the same direction as the; Cylinders installed at both ends of the zeroing roll to vary the height of the zeroing roll; A pulse generator for detecting a height change of the cylinder and transmitting the detected change to the tension meter zeroing means; And a servo valve and a hydraulic pump for opening and closing the hydraulic circuit of the cylinder by a control signal supplied from the tension meter zeroing means. delete In the tension meter zeroing device of the continuous annealing furnace, The strips that span the tension meter rolls of the continuous annealing furnace are supported at the front and rear ends of the tension meter rolls, respectively, and are pushed upwards or returned to their original positions, and the strips are synchronized with the strip traveling speed of the continuous annealing furnace. Strip lifting / transporting means; Remotely control the strip lifting / transporting means to push the strip upwards to a position that is not in contact with the tension meter roll, and then perform the tension meter zeroing, and remotely control the strip lifting / transportation means after zeroing the tension meter. And a tension meter zeroing means for automatically returning the strip to its original position and automatically compensating the tension before and after the tension meter by detecting a change in length of the strip according to the tension meter zeroing. The tension meter zeroing means, A zeroing switch for selecting whether or not to zero the tension meter; A tension meter control unit for supplying a current to a load cell installed under the tension meter, calculating a tension of the strip across the tension meter roll by a change in voltage of the load cell, and outputting a value for controlling the tension; Starting by the zeroing switch, the tension meter is zeroed while controlling the transfer operation and the lifting operation of the strip lifting / transporting means according to the line operation state of the continuous annealing furnace, and the lifting operation of the strip lifting / transporting means Compensation for the tension change of the strip according to the tension meter zeroing by calculating the tension compensation value of the front and rear ends of the tension meter roll according to the length change amount of the strip, and the tension control value output from the tension meter control unit of the tension meter roll An electric controller for controlling the tension of the strip across the tension meter roll by controlling the rotation speed of the tension adjusting roll located at the front and rear ends; A first motor driving device for controlling the tension of the strip traveling through the continuous annealing path by variably controlling the rotation speed of the tension adjusting roll; And a second motor driving device configured to variably control the rotational speed of the zeroing roll to match the line operating speed of the continuous annealing furnace. The method of claim 5, wherein the tension meter zeroing means, The strips are calculated by calculating a tension compensation value before and after the tension meter roll by the amount of change in the length of the strip according to the tension meter zeroing, while selectively controlling the transfer operation of the strip lifting / transporting means in the line operation state of the continuous annealing furnace. Tension meter zeroing device of the continuous annealing furnace, characterized in that for controlling the tension of the. The method of claim 5 or 6, wherein the strip lift / transfer means, The strip extending over the tension meter roll may be installed to be elevated to return upward or to return to the original position before or after the tension meter, and the driving direction of the strip may be provided at each of the front and rear ends of the tension meter roll. Zeroing roll is rotatably installed in the same direction as the; Cylinders installed at both ends of the zeroing roll to vary the height of the zeroing roll; A pulse generator for detecting a height change of the cylinder and transmitting the detected change to the tension meter zeroing means; And a servo valve and a hydraulic pump for opening and closing the hydraulic circuit of the cylinder by a control signal supplied from the tension meter zeroing means. delete In the method of zeroing the tension meter of the continuous annealing furnace, Installing zeroing means for controlling the strip lifting / transporting means to move the strip before and after the tension meter roll of the continuous annealing furnace; The first setting that does not contact the tension meter roll through the control of the strip lift / transfer means by performing stripping of the tension meter while controlling the transport operation and the lift operation of the strip lift / transfer means. Pushing upwards to a position; Performing the tension meter zeroing; And returning the strip to its original position by remotely controlling the lifting / transfer means again after zeroing the tension meter. The method of claim 9, A process step of synchronizing the zeroing means at the line operating speed by determining whether the line operating state of the continuous annealing furnace is before the zeroing means pushes the strip to the first set position through the control of the strip lift / transfer means; Tension meter zeroing method of the continuous annealing furnace further comprising a. The method of claim 10, The zeroing means moves the strip through the strip lifting / transporting means to detect the length change of the strip according to the lifting and lowering as the height change amount of the zeroing means to calculate the tension compensation values of the front and rear ends of the tension meter roll, And a processing step of compensating for the tension change before and after the tension meter with respective tension compensation values.

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