KR20040033106A - Apparatus and method for controlling roll gap in continuous mill process - Google Patents

Abstract

PURPOSE: Rolling roll gap control apparatus and method for preventing burn out of the surface of rolls in continuous rolling process are provided to control the roll force cylinder in such a way that a roll force cylinder quickly opens roll gap by operation of force motor calve according to the detection after detecting strip skewness and breakage portion in front of cold rolling rolls. CONSTITUTION: The rolling roll gap control apparatus comprises a strip skewness preventing unit(50) which is installed at both sides of a strip proceeding path to detect width position and skewness of strip and prevents burn out of the surface of the rolls by preventing strip skewness according to control signals; a stand tension sensing part(150) comprising tension rolls installed between stands of rolling mill, and load cells for detecting load applied to the tension rolls; a strip breakage judging part into which tension values detected by the stand tension sensing part are inputted, and which recognizes breakage of strip by comparing the detected tension values with a preset standard tension; a motor revolution number detecting part for detecting the number of revolution by converting pulse corresponding to rotation of motor into the number of revolution; a control part for judging whether the comparison results are low speed or high speed by comparing the number of revolution detected by the motor revolution number detecting part with a preset standard revolution number during judgement of strip breakage by the strip breakage judging part, proceeding control process after operator checking in case that the comparison results are low speed, controlling force motor calve for tension off of tension reel and all stands of the rolling mill in case that the comparison results are high speed, and performing controlling for preventing skewness using the strip skewness preventing unit by judging width position and skewness of the strip skewness preventing unit.

Description

Rolling roll gap control device and method for preventing roll surface burnout in continuous rolling process {APPARATUS AND METHOD FOR CONTROLLING ROLL GAP IN CONTINUOUS MILL PROCESS}

The present invention relates to a rolling roll gap control method in a continuous rolling process, in particular, during cold rolling continuous operation, strip meandering or stripping due to high-speed operation, such as failure caused by breakage due to defects and other factors of the strip After detecting the meandering or breaking point in front of the cold rolling roll (meandering device), the hydraulic pressure reduction cylinder quickly opens the roll gap (80MM) by the operation of the force motor separator (FMV) according to this detection. To control the rear work roll, middle roll. Roll surface damage in the continuous rolling process that can minimize the amount of breakage (roll burnout) of the roll surface such as backup rolls, thereby improving productivity and preventing safety accidents by reducing cost and shortening the cutting time. It relates to a rolling roll gap control method for preventing.

1 is a general cold rolling operation state diagram, referring to FIG. 1, a device for adjusting strip centering at the side of a rolling mill when cold rolling is performed on a pickled strip using a continuous rolling mill which is very important in a cold rolling process. The roll is installed and the cold rolling operation is performed by setting data instructed according to the material thickness, plate width, and steel grade.

Conventionally, in case of trouble such as plate breaking due to strip meandering and other factors during continuous rolling high speed operation, the line is stopped in the roll gap close and the line is stopped behind the plate breaking. Since the roll rotates until the speed reaches zero, the stents are wound between the rolls, causing problems such as twisting and breakage of the roll surface. Due to this, the roll waste or roll polishing waiting time is long, and the grinding amount is also polished more than usual, resulting in a decrease in productivity due to cost increase and delay in action time.

FIG. 2 is a state diagram of the burned-out surface of a roll in a conventional cold rolling mill by driving meandering. Referring to FIG. 2, generally, each rolled stand is welded at the entrance for continuous rolling and passes through a strip 1 storage facility. Back-up rolls (4-3,4-) which support and control the work rolls (4-1,4-4) and intermediate rolls (4-2,5) required for rolling to 6,6-1 to 5) 6) It is a rolling mill consisting of a string roll (3) for straightening the strip meandering, and it continues to operate even when the strip meanders or the level is abnormal after the roll replacement during operation, resulting in a large amount of burnout of the roll surface due to plate breaking and breaking. As it is, it is continuously rolled up and generates trouble.

3 is a state diagram in which a strip of a broken portion during rolling is wound on a roll. Referring to FIG. 3, when a plate break occurs during a high speed rolling mill, the line stops in a state where a load is applied to a rolling roll. And the rolling rolls 4-1 to 6 rotate until the speed becomes zero in the trouble-generating rear stand 21 to 25, so that the strip 200 is twisted between the rolls and the gear 210. And roll breakage (see FIG. 10).

Next, the plate breaking damage in the continuous rolling process of the steel mill is shown in Table 1 below.

NO Date of occurrence occuring area speed Action time Roll replacement quantity Roll Polishing Amount One 99.03.07 # 1-2STD 1200 mpm 84 minutes 20EA 61 mm 2 99.03.30 # 1-2STD 1000 mpm 314 minutes 20EA 141 mm 3 99.04.08 # 1-2STD 1900mpm 89 minutes 20EA 85 mm 4 99.04.30 # 1-2STD 1900mpm 162 minutes 20EA 103 mm 5 99.05.04 # 1-2STD 1900mpm 157 minutes 20EA 75 mm 6 99.05.05 # 1-2STD 1900mpm 399 minutes 20EA 83 mm 7 99.05.05 # 1-2STD 1530mpm 326 minutes 20EA 44 mm 8 99.05.14 # 1-2STD 1500 mpm 79 minutes 18EA 43 mm 9 99.05.24 # 1-2STD 1900mpm 250 minutes 20EA 70 mm 10 99.06.05 # 1-2STD 1900mpm 161 minutes 20EA 80 mm 11 99.06.17 # 1-2STD 1500 mpm 155 minutes 20EA 110 mm

In Table 1, "# 1-2STD" means first and second stands, and "EA" means number.

In the automatic adjustment of the stand line automatic adjustment device of the conventional skin pass mill, the upper backup roll and the upper walk at the skin pass mill stand line and the strip pass line distance are calculated and programmed by calculating and programming the existing skin pass mill strip pass line position and stand line distance. The rule minus the diameter of the rule, the stand line is automatically compensated for, and the strip pass line is automatically calculated by the pulse generator.

In addition, in the conventional plate breaking prevention device due to the meandering of the strip during rolling, the sensor detects this when the strip and the strip touch or the distance is close, even if the strip meanders in an instant, and a quick stop immediately. The rolling operation stops before the break occurs because it is connected to the.

In addition, in the conventional surface defect detection device for preventing other rolling roll damage, it is a surface defect detection device for preventing the surface of the rolling roll surface for supplying a defect-free rolling roll by thoroughly inspecting the various defects occurring in the rolling roll to be.

However, in such a conventional apparatus, troubles such as breakage due to strip meandering or defects due to strip defects and other factors, etc. occur during cold rolling continuous operation, and thus, work rolls and intermediate rolls in the rear. There is a problem that an amount of breakage (roll burnout) of a roll surface such as a backup roll cannot be avoided.

The present invention has been made to solve the above problems, an object of the present invention is the strip due to high-speed operation, such as during the cold rolling continuous operation, strip meandering or when trouble such as breakage due to the defect and other factors of the strip After detecting the meandering or breaking point in front of the cold rolling roll (meandering device), the hydraulic pressure reduction cylinder quickly opens the roll gap (80MM) by the operation of the force motor separator (FMV) according to this detection. To control the rear work roll, middle roll. Roll surface damage in the continuous rolling process that can minimize the amount of breakage (roll burnout) of the roll surface such as backup rolls, thereby improving productivity and preventing safety accidents by reducing cost and shortening the cutting time. It is to provide a rolling roll gap control method for preventing.

1 is a general cold rolling operation state diagram.

Figure 2 is a roll surface burnout state diagram during operation by the plate meander of the conventional cold rolling mill.

3 is a state diagram in which the strip of the fracture portion of the conventional rolling is wound on the roll.

4 is an overall configuration diagram of a rolling roll gap control apparatus according to the present invention.

5 is a block diagram of the strip meander prevention apparatus of FIG.

FIG. 6 is a detailed view of the strip meandering device of FIG. 5.

7 is a configuration diagram of the plate breaking detection and control device of FIG. 4.

8 is an overall configuration diagram of a continuous rolling installation to which the present invention is applied.

9 is a flow chart showing a rolling roll gap control method of the continuous rolling process according to the present invention.

10 is a comparative state diagram of the present invention and conventional roll surface burnout.

Explanation of symbols on the main parts of the drawings

1 cold rolled material 2 bridal roll

3: strip centering roll 4-1, 4-4: work roll

4-2,4-5: Middle roll 4-3, 4-6: Backup roll

6: Hydraulic pressure reduction cylinder 6-1 to 5: Force motor valve

7: Pressure detection device 8: Plate breaking reference set value

10: roll gap 11: pass line

12: width measuring device 21 ~ 25: # 1 stand ~ # 5 stand

44: quick stop 45: emergency stop

50: rolling roll burnout prevention device 50-1: gear

50-2: strip position detector 53,55: strip detector

100: PLC 150: stand tension detection unit

200: plate breaking determining unit 205: broken strip

210: broken strip wound state 250: motor speed detection unit

300: control unit 310: master PLC (PLC)

320: AGC PLC350: Roll gap regulator

As a technical means for achieving the above object of the present invention, a first feature of the present invention is a control device for detecting and preventing meandering and breaking of a strip during a rolling roll, which is provided on both sides of the strip traveling path. A strip meandering device for detecting the width position and meandering of the strip and preventing the strip meandering according to a control signal to prevent burnout of the roll surface; A stand tension sensing unit including a tension roll provided between the stands of the rolling mill, and a load cell for detecting a load applied to the tension roll; A plate breaking determining unit which receives the tension detected by the stand tension detecting unit and recognizes the strip breaking by comparing the detected tension with a preset reference tension; A motor rotation speed detection unit configured to detect a rotation speed by converting a pulse corresponding to the motor rotation into rotation speed; When the plate breaking determination is made by the plate breaking determination unit, the detection speed by the motor speed detecting unit is compared with a preset reference speed to determine whether the engine is low speed or high speed. In the case of high speed, the tension reel of the tension reel and the force motor separation of all the stands of the rolling mill are controlled, and the width meandering and the meandering of the strip meandering device are judged to prevent meandering with the strip meandering device. A control unit for performing control; A roll gap adjuster for adjusting a gap of the roll according to the control of the controller; It is to provide a rolling roll gap control device for preventing the roll surface burnout in the continuous rolling process characterized in that it provides.

In addition, as another technical means for achieving the above object of the present invention, a second aspect of the present invention is a control method for detecting and preventing meandering and breaking of the strip during the rolling roll, the strip when entering the strip Detecting a width at both sides in a width direction of the first step; A second step of adjusting the roll gap by controlling the hydraulic pressure reduction device of the rolling roll when determining to meander based on the width detection; During cold rolling, a third step of detecting the breaking (plate breaking) of the strip in the mill stand; In the case of plate breaking judgment, the rolling roll status information is displayed to the driver during the low speed operation (below 200mpm), and the roll gap quick open control, all stand HYROP master off, tension during the high speed operation (more than 200mpm). A fourth step of controlling the reel off; A fifth step of opening the roll force cylinder of the rolling roll with the rolling roll according to the control; And a sixth step of providing the driver with the rolling roll state information including the control state on the screen. It is to provide a rolling roll gap method for preventing the burn surface burnout in a continuous rolling process characterized in that it comprises a.

Hereinafter, the structure and operation of the rolling roll gap control device for preventing roll surface burnout in the continuous rolling process according to the present invention will be described in detail. In the drawings referred to in the present invention, components having substantially the same configuration and function will use the same reference numerals.

4 is an overall configuration diagram of a rolling roll gap control apparatus according to the present invention, referring to Figure 4, the rolling roll gap control device for preventing the roll surface burnout in the continuous rolling process according to the present invention both sides of the strip traveling path A strip meander prevention device 50 for detecting the width of the strip and the meandering of the strip and preventing the strip meandering according to a control signal to prevent burnout of the roll surface, and a tension roll installed between the stand of the rolling mill, and the tension The stand tension sensing unit 150 including a load cell for detecting a load applied to the roll and the tension detected by the stand tension sensing unit 150 are input, and the detected tension is compared with a preset reference tension. Plate breaking determination unit 200 (8) for recognizing strip breakage, motor rotational speed detection unit 250 for detecting the rotational speed by converting a pulse corresponding to motor rotation into a rotational speed, and the plate breaking determining unit When determining the plate breaking, comparing the detected rotational speed by the motor rotational speed detection unit 250 with a preset reference rotational speed to determine whether it is low speed or high speed, and in case of low speed, proceed to the process of controlling after checking the operator's letter. In the case of the high speed, the tension reel of the tension reel and the force motor separation for all the stands 21 to 25 of the rolling mill are controlled, and the width position and the meandering of the strip meander prevention device 50 are determined to determine the The strip meander prevention device 50 includes a control unit for controlling the meandering prevention, and a roll gap adjuster for adjusting the gap of the roll according to the control of the control unit.

FIG. 5 is a configuration diagram of the strip meandering device of FIG. 4, and FIG. 6 is a specific view of the strip meandering device of FIG. 5.

5 and 6, the strip meandering device 50 includes rotating roller guides 53-2 and 55-2 installed upward on both sides of a traveling path of the strip, and the rotating roller guide 53. And strip guards 53-1 and 55-1 formed at heights corresponding to the respective ends of the strips to prevent wear at both ends of the strips, and the rotary roller guides 53-55, respectively. 2,55-2, the detector movable table (53, 55), which is formed by the thread is formed and movable left and right, coupled with the threads of the movable table (53, 55), the movable table (53, 55) Gears 50-1 and 50-2 for moving the left and right sides and strip meanders at both ends of the moving parts 53 and 55, respectively, to detect the width of the strip and provide it to the controller. Detectors 54 and 56, and a width position adjuster 50a for controlling the gear box 50-1 under the control of the controller.

In addition, the PLS (100) receiving the strip width detected by the strip width gauge (8) located in front of the cold rolling mill rolling roll and the strip position detector (50-2) for controlling the received strip width is received. The detector moving stages 53 and 55 to which the strip detectors 54 and 56 are attached are moved to the left and right, and the measuring device 50 for detecting the meandering strip is made of a screw type. At the ends of the movable bars 53 and 55, the strip width detectors 54 and 56 which detect the strip through the sensor operation of the upper and lower positions are formed up and down, respectively, and the left and right width detectors 54 and 55 respectively. 56 and a sensor support 53-1, 55-1 supporting the lower sensor between the upper and lower sensors. In addition, the detection unit for detecting strip meandering and plate breaking occurs in order to prevent abrasion of both ends of the width 1 of the strip 1 due to contact with the strip meander measuring sensor supports 53-2 and 55-2. -1,55-1 is attached and consists of a gear box 50-1 for moving the left and right movement bar (53, 55) and a width position adjuster for controlling the moving distance through the rotation of the gear.

The stand tension sensing unit (TENSION METER ROLL LOAD CELL) 150 is provided with a tension meter roll between the mill stands so that a strip (steel plate) passes through the top of the roll, and is positioned below the roll according to the force of the load applied to the tension meter roll. Voltage is generated in the load cell. Take this voltage and convert it to tension (TON) in accordance with the voltage change.

The plate breaking detection unit 200 is applied to the strip thickness control by receiving the tension between the stand of the rolling mill with the above tension, and when it falls below the reference value (MIN 30% or less) at any moment as the plate breaking (STRIP BREAKAGE, plate boiling) Recognize.

The motor speed detector 250 includes a motor speed data receiver (FROM PULSE GENERATOR) and a motor speed converter, and the motor speed data receiver (FROM PULSE GENERATOR) pulses the rotating shaft to detect the motor speed. The generator is connected, and when the motor rotates, the pulse generator rotates simultaneously and generates 2400 pulses every time it is received by the data receiver. The motor rotation speed converting unit 250 receives the pulse signal generated at this time and converts it into revolutions (rpm: revolutions per minute), and converts the revolutions of one revolution (rpm) in units of "mpm" when 2400 pulses are generated. The rotational speed of the rolling motor is shown. Here, Rpm is "revolution per minute" and Mpm is "meter per minute".

FIG. 7 is a configuration diagram of the plate breaking detection and control apparatus of FIG. 4, and FIG. 8 is an overall configuration diagram of a continuous rolling facility to which the present invention is applied. FIG.

The roll gap used in the present invention is a position where the push force of the push-up " hyd " cylinder is raised at the time of zeroing the mill roll after replacing the roll and adjusting the pass line. The roll gap is obtained by subtracting the position B in which the cylinder rises during rolling from position A) during zero adjustment.

The roll gap regulator operates under the control of the control unit, and according to the operation of the force motor valve 6 and the force motor valve 6 to open the gap of the rolling rolls, the motor and the driving force are controlled. The force motor separator to be separated, the wedge / locker plate 7 for limiting the roll gap as the load control of the roll gap under the control of the control unit, and the stop function by the driver's operation immediately ( quick) stop 44 and emergency stop switch 45.

In addition, referring to FIG. 9, a tension meter roll is provided for each rolling stand 21 to 25 so as to detect breakage during continuous rolling. In addition, a set value in which measured values are set in advance In comparison with the plate breaking detector 8 for detecting plate breaking is provided. Force motor valve (6) which can control roll gap of rolling mill at the same time with hyrop output (10-1) after strip meandering and plate breaking detection, and weds / locker plate required to limit roll gap as load control in roll gap control (7) Master PLC (PLC), which controls the tension-off function of the tension reel when detecting the breakage of the electrical equipment and the risk of driver's safety accident because the strip fragments are scattered by the tension during the breaking. 310 and the hyrop master-off AGC PLC 320 of the stand 21-25 before rolling are controlled. In addition, during the low-speed operation during rolling, the driver is connected to the quick stop 44 and emergency stop 45 switches, which are the judgment stop function, in the aspect of facility protection. It is.

9 is a flow chart showing a rolling roll gap control method of the continuous rolling process according to the present invention, Figure 10 is a comparative state diagram of the present invention and conventional roll surface burnout.

Operation of the present invention configured as described above will be described in detail below based on the accompanying drawings.

The present invention detects the degree of strip meandering or fracture due to high speed operation in front of the cold rolling roll in the event of trouble such as strip meandering or breakage due to strip defects or other factors during cold rolling continuous operation (meandering device) After this, the hydraulic pressure reduction cylinder is controlled by the operation of the force motor separator (FMV) so as to quickly open the roll gap (80 mm). The amount of damage (roll burnout) of the roll surface of the backup roll or the like can be minimized, which will be described in detail below.

First, when the strip 1 enters, the first steps S51 and S52 detect widths on both sides of the strip in the width direction, that is, when the strip 1 enters, as shown in FIG. 50) Strip width measurement gauge (8) installed in front of the strip (1) measure the width and transmits to the PLC 100, and again from the PLC 100 to the width positioner (50-2). The detector moving bases 53 and 55 are moved left and right by the rotation of the gear 50-1 to the data transmitted to the width position adjusting unit 50-2, and the width detector 54 attached to the detector moving base. 56 is located at the end of the strip (1) width. Here, step S52 of FIG. 8 includes measuring the strip width to determine whether the strip meanders.

Then, the second step (S52-S54) determines the meandering on the basis of the width detection, and adjusts the corresponding roll gap by controlling the corresponding hydraulic pressing device 6 of the rolling roll, in this way when meandering the strip (1). That is, when the strip crossflows in one direction due to the left and right level failure of the work rolls 4-1 and 4-4 during cold rolling, either of the sensors of the strip width detectors 53 and 55 causes the strip ( 1) When it is operated by the detection, the hydraulic pressure reduction device 6 on the opposite side of the sensor detected by the width detectors 53 and 55 of the hydraulic pressure reduction device 6 of the work roll and the driving roll is lowered by a predetermined amount. Since the roll gap of 4-4) is adjusted, the strip 1 can be cold-worked without meandering.

Then, the third step (S61-S66) detects the break (plate break) of the strip in the mill stand (21-25) during cold rolling.

Next, in the fourth step (S71, S72, S81-S84, S86, S87), when the plate breaking is determined, during the low speed operation (less than 200mpm), the rolling roll state information is provided to the driver on the screen, and the high speed operation is performed. During 200mpm or more, roll gap quick open control, all stand "HYROP" master off, and tension reel off are controlled. Here, the conversion equation for converting the pulse corresponding to the rotation of the motor into the number of revolutions is represented by the following equation (1).

[Equation 1]

(rpm (Rotation) X ROLL DIRMETER X) / GEAR Ratio = mpm (Rotation Speed)

Therefore, in Equation 1, when the plate break is determined as the tension (TENSION) falls below the reference value when the motor rotational speed is 200mpm or more, the respective parts of the present invention are operated.

Next, as shown in FIG. 8 and FIG. 9, during the normal cold rolling, facilities such as plate break 200, etc. in the mill stand 21 to 25 due to the meandering of the strip 1 or the defect of the strip and other factors are provided. In terms of protection, the line speed is controlled by the quick stop 44 and emergency stop 45 buttons after the driver's confirmation in the low speed operation (less than 200mpm) by the rolling speed set value (9). When detection by the breaking detection method is performed in the plate breaking detection unit 200, when the cold rolling speed is low speed operation (less than 200mpm), the break site of the standstill stand using the stop switch on the panel of the driver, that is, It is to check the breakage and damage of the roll, and to check the twisting and crimping state of the strip, the shear pin broken state (43), and the like. Comparing the operation state control to the flow chart is shown in Fig.

In case of trouble such as plate breaking during high speed operation, first, set the mini-tension value between the rolling stands in advance as shown in Table 2 and input it to the electric chamber PLC and the tension value between the stands 21 to 25 is less than 30% (8). Breakage detection is performed by the break detection unit 200.

During breakage during cold rolling high speed operation (more than 200mpm, 9), a large amount of surface damage occurs in the roll, so that the control of the master PLC 310 for the roll gap control of the present invention for minimizing the prevention of roll surface damage and The cold rolled stand 21 to 25 "hyrop" master off the control and output (300A, 300B) of the AGC PLC (320) to be the tension reel (tension reel) # 1, 2 tension off and become a full stand master off.

In addition, the roll gap quick open control state when the plate breaking signal by the control is stand-on between the cold rolling mills # 1 to 2 will be described as follows.

For example, when stand-on between # 1 and # 2, the roll gap quick open (10-1) and the "hyrop" output (10-2) are controlled simultaneously, starting from the stand behind the flank detection stand. Force motor valves (6-1 to 5) of the # 2,3,4,5 stand work rolls and drive rolls are opened and closed to operate the roll force cylinder (6). 4,5 Stand work roll, roll gap quick open (10-2,80MM) of driving roll is controlled so that when surface break occurs during high speed cold rolling due to strip meander or strip defect, etc. Continuous rolling is operated while minimizing burnout and improving problems such as shortening of breakage processing time. At this time, if the tension set value, plate breaking detection value, plate breaking generation stand (STD) and roll gap open stand (QUICK) are shown, It is shown in Table 2 below.

STD Tension set point Leaf breaking detection value Leaf breaking STD Roll gap immediate open STD # 7BR-1STD 5-25 tons 1.5 tons # 1STD-2STD 5-25 tons 1.5 tons # 1STD-2STD 2,3,4,5 STD # 2STD-3STD 5-25 tons 1.5 tons # 2STD-3STD 3,4,5 STD # 3STD-4STD 5-25 tons 1.5 tons # 3STD-4STD 4,5 STD # 4STD-5STD 5-25 tons 1.5 tons # 4STD-5STD 5 STD # 5STD-T / R 5-25 tons 1.5 tons

Next, the fifth step S85 opens the roll force cylinder of the rolling roll with the rolling roll according to the control. Finally, in the sixth step S91-S94, the rolling roll state information including the control state is provided. Provide the driver with the screen.

In the present invention as described above, after the strip meander measuring device is installed and measured, the meandering amount is transmitted to PLC to control the roll level, and when the plate breaking and other troubles are generated, the tension value as shown in Table 2 is set in advance. Master PLC (320) is started to detect breakage, etc. In terms of facility protection, tension reel tension is turned off according to the speed just before occurrence (more than 200mpm) and all stand "hyrop" master is off and AGC PLC When the signal is transmitted to the 320, a force motor separator (FMV: force moter calve, 6-1 to 5) is opened and closed, and a hydraulic roll force cylinder installed on a work roll and a driving roll around a rolling stand, 6) is operated so that the plate stand 200 generates rear stents 21 to 25 to control the roll gap 10 to be fine-tuned and quick open (roll gap quick open, 80MM, 10-1). Breaking occurrence caused by Measures to minimize the damage and trouble times of trouble occurrence roll surface defects such as strip can achieve the cost savings and productivity improvements.

According to the present invention as described above, in the case of continuous rolling operation, when the trouble occurs such as strip meandering or breakage due to the defect and other factors of the strip, the degree of strip meandering or breakage portion due to the high speed operation in front of the cold rolling roll After detecting (meandering device), the force reduction motor (FMV) acts accordingly to control the hydraulic pressure reduction cylinder to quickly open the roll gap (80MM), so that the rear work roll, intermediate role. Roll surface damage in the continuous rolling process that can minimize the amount of breakage (roll burnout) of the roll surface such as backup rolls, thereby improving productivity and preventing safety accidents by reducing cost and shortening the cutting time. It relates to a rolling roll gap control method for preventing.

In addition, according to the present invention, strip meandering for minimizing the burnout state of the rolling roll due to high speed operation in case of trouble such as strip meandering or breakage caused by defects or other factors of the strip during cold rolling continuous operation By correcting the level and detecting the breaking point, the force motor separator (FMV) is controlled by PRC control to open and close the hydraulic pressure reduction cylinder so that the roll gap is immediately open (80MM), minimizing the damage on the roll surface. Cost savings and shortened plate breaking time improve productivity and prevent safety accidents.

The above description is only a description of specific embodiments of the present invention, and the present invention is not limited to these specific embodiments, and various changes and modifications of the configuration are possible from the above-described specific embodiments of the present invention. It will be apparent to those skilled in the art to which the present invention pertains.

Claims (4)

In the control device for detecting and preventing meandering and breaking of the strip during the rolling roll, A strip meander prevention device 50 installed on both sides of the strip traveling path to detect a width position and meandering of the strip, and prevent strip meandering according to a control signal to prevent burnout of the roll surface; A stand tension sensing unit 150 including a tension roll provided between the stands of the rolling mill, and a load cell for detecting a load applied to the tension roll; A plate breaking determiner 200 which receives the tension detected by the stand tension detecting unit 150 and compares the detected tension with a preset reference tension to recognize strip breakage; A motor rotation speed detection unit 250 for detecting a rotation speed by converting a pulse corresponding to the motor rotation into rotation speed; When the plate breaking determination unit 200 determines the plate breaking, the detection speed by the motor speed detecting unit 250 is compared with a preset reference speed to determine whether it is low speed or high speed. After checking the magnetic field proceeds to control, in the case of a high speed, the tension reel of the tension reel and the force motor separation for all the stands 21 to 25 of the rolling mill, and also the strip meandering device (50) Control unit 300 to determine the width position and the meandering of the) to control the meandering prevention to the strip meandering device (50); A roll gap adjuster 350 for adjusting a gap of the roll according to the control of the controller 300; Rolling gap control device for preventing the roll surface burnout in the continuous rolling process characterized in that it comprises a. According to claim 1, wherein the strip meander prevention device 50 Rotary roller guides 53-2 and 55-2 installed upward on both sides of a traveling path of the strip; Strip guards 53-1 and 55-1 formed on the rotary roller guides 53-2 and 55-2 at a height corresponding to each end of the strip to prevent abrasion at both ends of the strip; A detector moving table (53, 55) supported by the rotating roller guides (53-2, 55-2) and movable from side to side with threads formed thereon; Gear boxes (50-1, 50-2) coupled to the threads of the movable table (53, 55) for moving the movable table (53, 55) left and right; Strip meander detectors 54 and 56 provided at the meandering determination positions of both ends of the movable table 53 and 55 to detect the width of the strip and provide it to the controller; A width position adjuster 50a for controlling the gear box 50-1 under the control of the controller; Rolling roll gap control device for preventing the roll surface burnout in the continuous rolling process characterized in that it comprises a. The method of claim 1, wherein the roll gap regulator 350 A force motor valve (6) operating under the control of the controller and for opening the gap of the rolling rolls immediately; A force motor separator for separating the motor and the driving force according to the operation of the force motor valve 6; A wedge / locker plate 7 for limiting the roll gap as load control of the roll gap under the control of the controller; And A quick stop 44 and an emergency stop switch 45 for performing a stop function by a driver's operation; Rolling gap control device for preventing the roll surface burnout in the continuous rolling process comprising a. In the control method for detecting and preventing meandering and breaking of the strip during the rolling roll, A first step of detecting a width at both sides in the width direction of the strip when the strip 1 enters; A second step of adjusting the roll gap by controlling the hydraulic pressure reduction device (6) of the rolling roll when determining to meander based on the width detection; During cold rolling, a third step of detecting the breaking (plate breaking) of the strip in the mill stands 21-25; In the case of plate breaking judgment, the rolling roll status information is displayed to the driver during the low speed operation (below 200mpm), and the roll gap quick open control, all stand HYROP master off, tension during the high speed operation (more than 200mpm). A fourth step of controlling the reel off; A fifth step of opening the roll force cylinder of the rolling roll with the rolling roll according to the control; And Providing a rolling roll state information including the control state to a driver on a screen; Rolling gap control method for preventing roll surface burnout in a continuous rolling process characterized in that it comprises a.