KR20010060714A - A controlling system of automatic brush roll - Google Patents

Abstract

PURPOSE: An apparatus for controlling an automatic brush roll is provided to prevent deterioration of cleaning quality of a cold rolled steel sheet line by automatically calculating an abrasion amount of the brush roll during operation of a brush roll and a backup roll in the cold rolled steel sheet cleaning process, thereby forecasting and instructing the replacing time of the brush roll at a proper time. CONSTITUTION: In a steel sheet cleaning apparatus comprising of a plurality of brush rolls (1a,1b,1c,1d) and brush backup rolls (3a,3b,3c,3d) for cleaning the steel sheet, the apparatus for controlling an automatic brush roll comprises a screw motor (5) connected to the plurality of brush rolls (1a,1b,1c,1d) and brush backup rolls (3a,3b,3c,3d) so as to drive the brush rolls (1a,1b,1c,1d) and brush backup rolls (3a,3b,3c,3d); a screw motor driver (9) operating the screw motor (5); a pulse coder (7) adhered to the screw motor (5) so as to set an operating time point, a main area and a starting point where the brush rolls (1a,1b,1c,1d) are abraded; and a main controller (10) connected to the screw motor (5), the screw motor driver (9) and the pulse coder (7) so as to control the brush rolls (1a,1b,1c,1d) based on load currents of a brush roll driving motor by carrying out APLM (Auto Strip Pass Line Motion) control, AZTC (Auto Zigzag Tension Control) and AGMC (Auto Gap Motion Control) operations.

Description

Automatic Brush Roll Control Unit {A CONTROLLING SYSTEM OF AUTOMATIC BRUSH ROLL}

The present invention relates to a brush roll, and in particular, in the cold rolled steel sheet cleaning process, by automatically calculating the wear amount of the brush roll during the operation of the brush roll and the backup roll, it is possible to prevent the degradation of the cleaning quality of the cold rolled steel sheet by instructing the time to replace the brush roll in a timely manner. It relates to an automatic brush roll control device that can be.

In general, in the cold rolled steel sheet manufacturing process, the oil or foreign matter adhering to the surface of the steel sheet must be removed in the cold rolled steel sheet manufacturing process. In order to remove such oil or foreign matter, a cold rolled steel sheet manufacturing process is provided with a cleaning device consisting of a brush roll and a brush backup roll. Such a cleaning device removes oil or foreign matter adhering to the steel sheet by mechanical means, and removes foreign matters and the like by rotating the brush roll in a direction opposite to the traveling direction of the steel sheet.

By this reverse rotation, the brush roll tends to wear easily. Therefore, in order to perform a smooth cleaning process, the amount of wear of the brush roll must always be grasped. In the related art, the operation was stopped to determine the amount of wear by measuring the diameter of the roll or the degree of wear directly with the naked eye.

However, in this conventional method, since the wear amount of the brush roll must be checked in the offline state, the opportunity loss cost is incurred. In addition, when checking the amount of wear on-line, the operator must approach the driving body and directly grasp the amount of wear. Therefore, there was a risk of a safety accident and accurate measurement of the amount of wear was not possible. In addition, since the tension between the brush rolls and the pass line of the steel sheet are adjusted by manual adjustment, it is impossible to accurately adjust the pass line or set the steel sheet tension by determining the roll position.

The present invention has been made in view of the above, and in the cold rolled steel sheet cleaning process, the brush roll load time is detected according to the amount of wear of the brush roll during the operation of the brush roll and the backup roll, and the brush roll replacement time is compared with the set value in a timely manner. An object of the present invention is to provide an automatic brush roll control device capable of predicting.

In order to achieve the above object, the automatic brush roll control apparatus according to the present invention is connected to a plurality of brush rolls and brush back-up roll to drive the brush roll and the brush back-up roll, a screw for operating the screw motor A motor driver, a pulse coder that is attached to the screw motor to set an operation start point, a main area and a starting point where the brush roll is worn, and an APLM (Auto Strip Pass Line Motion) connected to the screw motor, screw motor driver and pulse coder It is composed of main controller that controls brush roll based on load current of brush roll driving motor by executing control control, AZTC (Auto Zigzag Tension Control) control and AGMC (Auto Gap Motion Control) operation.

1 is a view showing an automatic brush roll control apparatus for a cleaning apparatus in a cold rolled steel sheet manufacturing process according to the present invention.

Figure 2 is a flow chart showing the operation of the automatic brush roll control apparatus according to the present invention.

Figure 3 is a view showing the AZTC control in the automatic brush roll control apparatus according to the present invention.

4 is a view showing AGMO control in the automatic brush roll control device according to the present invention.

-Explanation of symbols for the main parts of the drawings-

1a, 1b, 1c, 1d: Brush roll 3a, 3b, 3c, 3d: Brush backup roll

5: screw motor 7: pulse coder

9: screw motor driver 10: main controller

12: indicator 14: input

Hereinafter, with reference to the accompanying drawings will be described in detail an automatic brush roll control device according to the present invention.

1 is a view showing an automatic brush roll control apparatus for a cleaning apparatus in a cold rolled steel sheet manufacturing process according to the present invention. As shown in the figure, a plurality of brush rolls 1a, 1b, 1c, 1d and brush backup rolls 3a, 3b, 3c, 3d are provided on the pass line through which the steel sheet proceeds. The brush rolls 1a, 1b, 1c, and 1d and the brush backup rolls 3a, 3b, 3c, and 3d face each other and are alternately formed. That is, as shown in the figure, if the first brush roll (1a) is located above the brush back-up roll (3a) facing it is formed below, the adjacent second brush roll (1b) is provided if facing below The brush backup roll 3b is provided above.

A screw motor 5 is installed on the brush rolls 1a, 1b, 1c, 1d and brush backup rolls 3a, 3b, 3c, and 3d, respectively, and the plurality of screw motors 5 are respectively provided. The pulse coder 7 is connected to control the accurate distance measurement and position of the brush rolls 1a, 1b, 1c, 1d and the brush backup rolls 3a, 3b, 3c, 3d. The brush motor 5 for driving the brush rolls 1a, 1b, 1c, and 1d performs an operation command by the V / F control device during normal and abnormal operation using an inverter. In addition, a screw motor driver 9 is connected to the plurality of screw motors 5 to operate the screw motor 5. The main controller 10 is connected to each of the plurality of screw motors 5, the pulse coder 7, and the screw motor driver 9.

The pulse coder 7 assists the main controller 10 to set a starting start point, a wear related area of interest, a starting point for replacing the brush rolls 1a, 1b, 1c, and 1d using an absolute coordinate system. In addition, automatic positioning of the brush rolls 1a, 1b, 1c, and 1d is performed automatically by using a built-in calculation device for movement control, measurement of wear of the brush rolls 1a, 1b, 1c, and 1d, and setting tension between the appropriate rolls. Control brush rolls.

In addition, the main controller 10 is equipped with an indicator 12 to display data such as the load current applied to the brush roll driving motor (not shown) and the distance between the steel sheet and the brush roll to inform the driver of the state of the system. The display unit 12 is provided with an input unit 14 for inputting various data.

Looking at the function of the automatic brush roll control device according to the present invention.

First, the distance is measured using the pulse output from the pulse coder (7). If this is expressed as an expression, it is as follows.

Where Pct is the total number of pulses in movement, Da is the number of pulses per unit length, n is the number of screw threads and P is the number of pulses of the pulse coder.

Second, the optimum operating conditions of the brush rolls 1a, 1b, 1c and 1d and the brush backup rolls 3a, 3b, 3c and 3d are set using the converted distance data.

Third, the distance L1 for the control command of the appropriate tension between the brush rolls 1a, 1b, 1c, and 1d is set.

Fourth, the wear amount of the brush rolls 1a, 1b, 1c, and 1d is calculated using the absolute coordinate system, and the replacement of the brush rolls 1a, 1b, 1c, and 1d is instructed.

Referring to Figure 2 will be described the operation of the brush roll control device of the present invention.

First, as shown in the figure, first, when power is applied to the system, the main controller 10 checks the pre-operational preparations of the control device, and then executes the checking operation of each brush roll pulse coder signal input state for tension setting. (S101, S102). Subsequently, after setting the origin, APLM (Auto Strip Pass Line Motion Control) is executed to align the pass lines of the steel sheet (S103, 104, 105). The APLM execution is performed by resetting all preset machine parameters using the V / F inverter and pulse coder of each roll, and setting the machine coordinate system and the electric control coordinate system under the same conditions, and then using the drive data and pulse data of the motor. Compare the measurement results with and make the deviation between ΔX and ΔY equal to zero.

As described above, after aligning the pass lines of the steel sheets, the positions of the rolls are arranged in a zigzag to perform AZTC (Auto Zigzag Tension Control), which is a tension applying operation of the steel sheets by the mechanical position displacement between the rolls (S106). This AZTC performing operation is shown in FIG. 3 (a) shows the concept of the AZTC operation, FIG. 3 (b) shows the basic mode of the AZTC, and FIG. 3 (c) shows the application mode. As shown in the figure, when the basic mode of the AZTC is made (S107), the screw motor 7 is operated by the screw motor driver 9, the brush roll (2 / 4B) No. 2/4 is lowered to the steel sheet Give an appropriate tension to (S110). If the AZTC is not the basic mode, the application mode is started, and as shown in FIG. 3 (c), the brush roll 1/3 (1 / 3B) is raised and the brush roll 2 / 4B (2 / 4B) is lowered. To give an appropriate tension (S108,109).

Simultaneously with the input of the line start signal, the brush roll performs the brush operation of the steel sheet. In this process, after the brushing operation has elapsed for a certain period of time, the end of the broth roll is worn out and the wear has to be compensated for a certain amount of travel. To do this, if the load current of the brush roll is detected and the load current falls below a certain value, the V / F controller is automatically operated to compensate for this, and the AGMC (Auto Gap Motion Control) is performed to apply a certain load current. .

The AGMC operation described above is shown in FIG. In the figure, Fig. 4 (a) shows the basic concept of AGMC and Fig. 4 (b) shows the gap compensation circuit. As shown in FIG. 4 (a), as the brush movement of the steel sheet proceeds, the wear of the brush roll 1 also progresses, thereby increasing the gap of the brush roll 1, and as a result, a driving motor for operating the brush roll. The current at 20 decreases. When the current decrease of the brush roll is detected, the wear of the slush roll 1 is recognized and the screw motor 5 is operated to adjust the gap of the brush roll 1 to the brush roll driving motor 20 again. Allow constant current. In the drawing, reference numeral 21 denotes a brush backup roll drive motor.

This operation will be described with reference to the gap compensation circuit shown in Fig. 4 (b). The pulses input from the pulse coder are converted by the distance matching and converter 30 of the determination circuit 40. When the converted value is detected by the comparator 31, the position of the brush roll is determined, and it is determined by the determination unit 32 whether this position coincides with the gap setting value of the brush roll set manually or automatically. The set gap is converted into digital data by the A / D converter and then input to the distance comparison circuit 45 as a reference signal.

The distance comparator determining section 39 compares the actual load current detected by the current detector 38 mounted on the brush roll driving motor 20 with the reference signal, when the actual load current is smaller than the reference signal. It is determined that the wear of the shallow (1) is in progress to operate the brush roll screw motor (5) to adjust the gap of the brush roll (1) to terminate AGMC (S113, 114).

At this time, various data such as the detected current value and the gap are displayed on the indicator 12 shown in FIG. 1 to inform the driver (S115).

When the unit process is completed, the process returns to the home position setting state in the AGMC end process (S116) to continuously perform the related work.

As described above, the present invention measures the operation quality by setting the optimum operating conditions of the brush roll and the brush backup roll, measuring the amount of brush wear, and displaying the replacement time in the cleaning device, which is the most important factor determining the surface quality of the steel sheet in the cold rolling process. It can be improved. In addition, it minimizes the manpower required for operation and maintenance by automatically setting initial conditions at the start of the process and storing and setting appropriate parameters, and proactively responds to changes in various operating conditions by eliminating high-powered manpower based on system automation and complex multifunctionalization. Will be able to cope.

Claims (4)

In the steel sheet cleaning device comprising a plurality of brush rolls and brush back-up roll to clean the steel sheet, A screw motor connected to the plurality of brush rolls and the brush backup roll to drive the brush roll and the brush backup roll; A screw motor driver for operating the screw motor; A pulse coder attached to the screw motor to set an operation start point, a main area where the brush roll is worn, and a starting point; And Connected to the screw motor, screw motor driver and pulse coder, the brush roll drive motor is loaded by executing APLM (Auto Strip Pass Line Motion Control) control, AZTC (Auto Zigzag Tension Control) control and AGMC (Auto Gap Motion Control) operation. Automatic brush roll control device composed of main controller which controls brush roll based on electric current. The method of claim 1, wherein the AZTC control, Basic control to fix some brush rolls and lower the remaining brush rolls; And Apparatus, characterized in that consisting of the application control to raise some of the brush rolls and the rest of the brush rolls. The method of claim 1, wherein the AGMC control, Means for detecting the position of the brush roll based on the pulses output from the pulse coder and outputting the position as a reference signal when the position coincides with the gap of the set brush roll; And And comparing the input reference signal with the actual load current of the brush roll driving motor and executing the screw motor when the actual load current is smaller than the reference signal. 2. The apparatus of claim 1, further comprising an indicator for displaying current and gap data across the brush roll drive motor.