KR200237472Y1 - Roll rolling force holding device - Google Patents

Abstract

The present invention relates to a roll rolling force holding device capable of automatically controlling the thickness of a steel sheet by automatically controlling a gap of a rolling roll in a rolling facility, and the position detector (8) for detecting the position of a piston in the cylinder (6). And X- directly measuring the gap between the roll and the sensor 10 for measuring the rotational speed of the transducer 9 for converting the measured rolling force into an electrical signal and the motor 9 for moving the screw 5 up and down. The current roll gap is checked through the ray monitor 23 to calculate a difference from the set roll gap, and the rotation of the motor 9 is confirmed while rotating through the sensor 10 to move the screw 5 up and down. And a control unit 22 for controlling the operation of the cylinder 6 while controlling the opening and closing of the servovalve 2 to check the position of the piston in the cylinder 6 through the position detector 8. The rolling force maintaining device 41 can maintain a stable rolling force Since it provides an effect that can maintain the thickness of the steel sheet to be rolled uniformly.

Description

Roll rolling force holding device

1 is a configuration diagram showing a schematic configuration of a rolling equipment to which a roll rolling force holding device according to the present invention is applied.

2 is a circuit diagram showing a connection state of a signal switching device, a load cell and a level converter according to the present invention.

3 is a circuit diagram of a power supply device and a signal switching device according to the present invention.

4 is an outer panel of the cooking and display unit.

* Explanation of symbols for main parts of the drawings

4 load cell 5 screw

6: cylinder 7: roll

8: position detector 9: motor

11: hot rolled steel sheet 22: control unit

23: X-ray monitor 40: Roll rolling force holding device

42: level converter 43: signal switching device

44: signal directing device 45: power supply

46 display and control device

The present invention relates to a roll rolling force holding device, and more particularly to a rolling rolling force holding device capable of uniformly controlling the thickness of a steel sheet by rolling force in a rolling facility that performs automatic thickness control (AGC: AUTOMATIC GAUGE CONTROL). It is about.

Conventional roll rolling force maintaining device using a load cell installed between the screw and the cylinder or between the screw and the roll pressing the roll from the front and rear of the rolling mill to measure the reduction of the rolling roll rolling the steel sheet in the rolling equipment Was measured to adjust the roll gap. However, in this method, when an abnormality occurs in the front load cell or the rear load cell, the roll gap cannot be controlled due to the sudden change in the reduction amount.

The present invention has been devised to improve the conventional problems as described above, the object of the present invention is to indicate whether the failure by the amount of reduction detected by the front or rear load cell and the load cell detection value of one side according to the operator's switch input It is to provide a roll rolling force holding device for controlling the rolling force of both rolls. As a technical means for achieving the above object, the apparatus according to the present invention is to determine the current roll gap from the signal of the work side and the drive side load cell, and to maintain the roll rolling force to maintain the determined roll gap at the set roll gap An apparatus, comprising: an operation and display portion having a switch for selecting the working side and driving side load cell signals and an indicator for displaying an operating state of a rolling roll; A signal switching device for selectively blocking and passing the rolling force detection signal output from the side load cell, a signal directing device for outputting the rolling force detection signal output from the working side and the driving side load cell without passing through the signal switching device; A rolling force detection signal selected from the signal switching device or a rolling force detection signal output from the signal directing device; And a control unit for moving the screw up and down by determining a current roll gap from the converted rolling force detection signal and calculating a difference between the determined current roll gap and the set roll gap. Provide the device.

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 is a block diagram showing a schematic configuration of a rolling equipment to which the roll rolling force maintaining device 40 according to the present invention is applied. The rolling rolls 7, 7... Roll the steel sheet 11 and press it to a predetermined thickness. The cylinder 6 is installed in two places on the working side and the driving side, and applies rolling force to the rolling rolls 7, 7... The position detector 8 detects the position of the piston of the cylinder 6.

The servovalve 2 interrupts the hydraulic pressure supplied to the cylinder. The roll motor 9 receives a control signal from the control unit 22 and rotates. The ball screw 5 receives the rotational force of the roll motor 9 to apply the rolling force to the rolling rolls 7, 7. The rotation sensor 10 measures the rotation speed of the roll motor 9.

The signal switching device 43 of the roll rolling force holding device 40 receives a rolling force sensing signal from the work side load cell and the driving side load cells 4 and 4 and receives the detection signal of one of the two load cells under the control of the operator. Output The level converter 42 converts the rolling force sensing signal output from the signal switching device 43 to a predetermined level.

The indicator 30 receives the detection signal output from the level converter 42 and displays an abnormal state. The control unit 22 receives the detection signal output from the level converter 42 and calculates the detection rolling force corresponding to the rolling force detection signal, and sets the thickness of the steel sheet input from the X-ray monitor 23 to the set value thickness. Each part is controlled so as to calculate the target rolling force necessary to apply the difference rolling force between the target rolling force and the sensed rolling force to the rolling rolls 7, 7. The X-ray monitor 23 measures the thickness of the steel sheet passing through the rolling rolls 7, 7... And outputs it to the controller 22.

Referring to FIG. 1, the present invention will be described with reference to FIG. 1. The control unit 22 includes the load cell 4 measuring the amount of reduction in order to maintain the gap of a predetermined rolling roll 7 in order to roll the steel sheet to a predetermined thickness. Check the current roll gap through the X-ray monitor 23, calculate the difference with the set roll gap, rotate the motor 9 while checking the rotation speed through the sensor 10, and move the screw 5 up and down. By controlling the opening and closing of the servo valve 2 and confirming the position of the piston in the cylinder 6 through the position detector 8, the operation of the cylinder 6 is controlled to set the gap of the rolling roll 7. Keep it to

2 is a circuit diagram showing the connection state of the signal switching device, the load cell and the level converter according to the present invention.

The work side detection signals W, R, B, and G output from the work side and the drive side two load cells 4, 4 are operated by the switches RW1-1 by the relays W1-W4 shown in FIG. Input to the level converter 42 through RW4, the drive-side detection signals (W, R, B, G) to operate the switch (RD1-RD4) operated by the relay (D1-D4) shown in FIG. Through the level converter 42.

In addition, the signal directing device 44 converts the working side detection signals W, R, B, and G output from the two load cells 4 and 4 on the working side and the driving side without passing through the signal switching device 43. Output to (42).

3 is a circuit diagram of a power supply device and a signal switching device according to the present invention.

The power supply unit 45 receives power from the commercial AC power supply 32 and converts the power into a DC voltage (for example, + 5V) to supply the signal switching device 43. The signal switching device 43 includes a work side and a drive side relay each configured of a plurality of relays, and the work side and the drive side relays transmit a sensing signal of the work side and the drive side load cells to the level converter 42 ( And a relay (W1-W4 or D1-D4) for driving RW1-RW4 or RD1-RD4, an interlock relay (W5 or D5), and a display relay (W6, W7 or D6, D7), respectively.

The display section of the operation and display section 46 is a switch W6, W7, D6, D7 driven by the display examples W6, W7, D6, D7, the display light emitting diodes LD1-LD3, and the resistor R1. -R3).

In figure 4 the outer panel of the operation and indicator is shown.

The operation and display section 46 indicates that the working side failure handling switch 415 and the driving side failure handling switch 416, the light emitting diode LD1 indicating that the working side rolling roll is operating, and the driving side rolling roll are operating. Light emitting diode LD2 for indicating that the light emitting diode is displayed, and light emitting diode LD3 for indicating a normal operation state.

Hereinafter, the operation and effects of the present invention will be described.

The rolling force detection signal detected by the work side and the driving side two load cells 4 and 4 is level converted by the level converter 42 through the signal switching device 43 in the roll rolling force maintaining device 40, and then the control unit Input to (22) is carried out as data for controlling the roll rolling force, and input to the display unit 30 to display an abnormal state of the rolling force.

When the rolling force detected in one load cell (for example, the work side load cell) out of the two load cells 4 and 4 on the working side and the driving side shows an abnormal state, the operator displays the display configured as shown in FIG. And the work-side troubleshooting switch 415 of the operation unit 46 is turned on, the switch TW of the signal switching device 43 is turned on in FIG. 3 and the + 5V supplied from the power supply device 45 is supplied. Voltage is applied to relays W1-W7 through contact D5.

When power is applied to the relays W1-W7, the switches RW1-RW4 of the signal switching device 43 are switched to the upper contact in FIG. 2 to detect the sensing signals W, R, B, and G of the driving load cell. Is input to the level converter 42 instead of the sensing signal of the working side.

Therefore, only the sensing signals W, R, B, and G of the driving side load cell are inputted to the control unit 22 and compared with the set values, so that the working side rolling roll and the driving side rolling rolls 7, 7... It is controlled by the sensing signals W, R, G and G.

In addition, the relay W5 blocks the interlock contact W5 so that the relays D1-D7 cannot be driven, and the relay W6 turns on the contact W6 to turn on the light emitting diode to indicate the operation of the driving side. LD2 emits light to indicate that it is controlled by a signal sensed by the load side load cell. The relay W7 cuts off the power applied to the light emitting diode LD3 indicating normal operation by blocking the contact W7 to stop the display.

However, if the load cell is performing normal measurement, but an abnormality occurs in the signal switching device 43, the signal directing device 44 of FIG. 2 is installed, and the rolling force measured value is immediately converted through the signal switching device 43 without using the level converter. The connector is detachably installed so that it can be delivered to (42).

Since the rolling force measured value is a micro signal (a few mV), all relays use a mercury relay to minimize contact resistance of the relay and install an independent power supply 45 as shown in FIG. 3 for reliability of circuit operation. do.

As described above, according to the present invention, even if abnormal measurement values are generated in the front or rear load cell by maintaining the rolling force measured in the load cell so as to accurately measure the gap of the rolling roll, no abnormality is generated by the roll rolling force maintaining device. It can control the rolling reduction sensed by the load cell to maintain stable rolling force so that the thickness of the rolled steel sheet can be maintained uniformly.

Claims (4)

A roll rolling force holding device for judging a current roll gap from signals of a work side and a drive side load cell and maintaining the determined roll gap at a set roll gap, wherein the switch and the roll select the work side and drive side load cell signals. Signal switching for selectively blocking and passing the rolling force sensing signal output from the working side and the driving side load cell in accordance with the operation and display unit having an indicator for displaying the operation state of the roll and the on state of the switch of the operation and display unit. And a signal directing device for outputting a rolling force sensing signal output from the work side and the driving side load cell without passing through the signal switching device, and a rolling force sensing signal selected from the signal switching device or the signal directing device. A level converter for converting the rolling force detection signal and a current roll gap from the converted rolling force detection signal. And determining and calculating a difference between the determined current roll gap and the set roll gap to move the screw up and down. The operation and display unit of claim 1, wherein the operation and display unit displays a failure of the work side load cell according to an on state of the work side failure handling switch 415 and the driving side failure handling switch 416, and the work side failure handling switch. In the off state of the light emitting diode LD2 indicating the failure of the driving side load cell and the working side troubleshooting switch and the driving side troubleshooting switch according to the on state of the light emitting diode LD1 and the driving side troubleshooting switch. Roll rolling force maintenance device, characterized in that consisting of a light emitting diode (LD3) to display the normal operating state according to. 2. The signal switching device according to claim 1, wherein the signal switching device operates according to the switches RW1 to RW4 and RD1 to RD4 which intercepts the rolling force sensing signals of the work side and the drive side load cells, and the on state of the work side fault handling switch. Working side relays W1-W7 and driving side relays D1-D7 operated according to the on-state of the driving-side failure processing switch, and the working side relays W1-W7 and driving-side relays D1. Each of the relays W1-W4, D1-D4, which is used to round off the switches RW1-RN4, RD1-RD4 which intercept the rolling force detection signal, and the other side of the working side relay and the driving side relay Interlock relays W5 and D5 for interrupting the driving of the relays W1-W7 or D1-D7 and indications for driving the light emitting diodes LD1, LD2, and LD3 depending on whether the fault switch is in an on state. Roll rolling force maintenance device comprising a relay (W6, W7, D6, D7). The method of claim 1, wherein the control unit rotates while checking the rotational speed of the motor through the sensor to move the screw up and down, and control the opening and closing of the servo valve to check the position of the piston in the cylinder through the position detector of the cylinder Roll rolling force maintaining device to control the motion.