JPH07108551A - Automatic thickness control device of calender device - Google Patents

Abstract

PURPOSE:To compensate for a dead time caused by a distance between a calender roll and a thickness sensor. CONSTITUTION:This automatic thickness control device is composed of a gap compensation device 13 which turns a deviation between thickness signals c1, c2 detected by thickness sensors 9a, 9b and a thickness setting signal (a) set previously to a gap signal between calender rolls 1a, 1b, and at the same time, compensates for electric and mechanical delay based on material quality, rolling and environmental conditions. Thus the gap signal is compensated for by compensation signals d1, d2 connected by a gap compensation device 13. Further, bank variations can be compensated for by adding data on the status of rolling load as rolling conditions. The status of rolling load can be interpreted even by the electric current of a drive motor in addition to by load cells 10a, 10b. Consequently, it is possible to make a rapid response when changing a set thickness, then prevent the thickness during the speed change from varying, and further, prevent the thickness from varying due to the bank variations.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention supports a calendar roll by using the output of a thickness deviation calculator for calculating the deviation between a set value of thickness and a detected value as a gap command in order to control the thickness of a sheet to a constant value. The present invention relates to an automatic thickness control device for a calendar device that controls the movement of the axle box of a calendar roll by a gap calculation device that calculates a deviation between a gap detection signal from a gap sensor that detects a gap between axle boxes and the gap command. is there.

[0002]

2. Description of the Related Art When a sheet is formed by a calendar facility, the sheet thickness is the most important factor in quality, but it affects the calender speed, material, roll gap and bank (amount of material accumulated between calender rolls). receive.

2A and 2B are views showing the basic structure of a calendar device. FIG. 2A is a front view and FIG. 2B is a side view. 1a and 1b are calendar rolls, and 2a and 2b and 2c and 2d are calendar rolls. Axle boxes supporting 1a and 1b, 3a and 3b are axle boxes respectively
Frames that support 2a and 2c and 2b and 2d, 4a and 4b are push screws that adjust the gap between the calendar rolls 1a and 1b, 5a and 5b are gap motors, 6a and 6b are rotations of the gap motors 5a and 5b, respectively. Is a converter for converting the movement amount of the push screws 4a and 4b, and 7 is a sheet. Reference numeral 19 indicates a bank of rolled material. The axle boxes 2c and 2d supporting the calendar roll 1b are fixed to the frames 3a and 3b, respectively, and the axle boxes 2a and 2b supporting the calendar roll 1a are supported by the frames 3a and 3b so that the gap between the axle boxes 2c and 2d can be adjusted. Has been done.

When the sheet 7 is formed by such an apparatus, a very large rolling load is applied to the calender rolls 1a and 1b, which results in deformation of the calender rolls 1a and 1b, deformation of the push screws 4a and 4b, and The deformation of the frames 3a and 3b occurs. The total amount of these deformations may affect the thickness of the sheet 7 to be molded by several tens to 100%.

When controlling the thickness of a sheet produced by such an apparatus, conventionally, the calender roll is supported by the deviation between the thickness detection signal from the thickness sensor for measuring the thickness of the sheet immediately after molding and the thickness setting signal. The gap motors 6a and 6b are intermittently turned on / off by a gap computing device that controls the gap motors 6a and 6b using a gap detection signal between the shaft boxes.

[0006]

However, it is difficult for the above-mentioned conventional apparatus to respond to changes in rolling conditions (speed, load), and there are the following problems. (1) The thickness sensor is installed on the sheet feeding side of the calendar roll, and depending on the calendar equipment, the thickness sensor may be installed far away from the calendar roll, which causes dead time and high speed. It is difficult to make a response. (2) In the case of the gap motor on / off control, since the mechanical deformation amount during rolling is large, the correction operation for the thickness change is intermittent and the response becomes slow.

The present invention has been made in view of the above-mentioned problems, and solves the above problems, and the thickness can be smoothly controlled even if the distance between the thickness sensor and the calendar roll is slightly different. An object of the present invention is to provide a calendar roll gap compensation control device for a calendar device.

[0008]

SUMMARY OF THE INVENTION An automatic thickness control device for a calendar device according to the present invention includes a thickness sensor for detecting the thickness of a formed sheet and outputting a thickness detection signal, as well as a shaft box for supporting a calendar roll. A sensor for detecting a gap between the boxes and outputting a gap detection signal is attached, and a thickness deviation signal output of the thickness calculation device for feeding back the thickness detection signal from the thickness sensor and a gap calculation device for feeding back the gap detection signal. In the automatic thickness control device as an input of, the gap compensation device that outputs the velocity compensation signal with the variation value corresponding to the velocity change or a value proportional thereto as the axial box gap compensation amount is provided, and in addition to the thickness deviation signal, It is characterized by compensating for changes.

That is, a means for achieving the object is a pair of calender rolls and a pair of calender rolls axially supported in a thickness control method for forming a sheet by a calender device for substances such as resin and rubber. Of the axle box and one of the pair of calender rolls to drive the calender roll to change the gap between the calender rolls, the gap motor engaging with the axle box and located at both ends of the calender roll, and the calender roll. A drive motor for driving the calender rolls, a thickness sensor provided on the sheet feeding side of the calender rolls, and gap sensors located at both ends of the calender rolls for detecting a gap between the pair of calender roll shaft boxes. In some cases, load cells located at both ends of the calendar roll that detects the rolling load of the sheet A gap calculation device configured to control the gap motor based on the deviation between the thickness setting signal and the gap detection signal, and a gap for correcting the gap between the axle boxes corresponding to the completion of the sheet regardless of the thickness detection signal of the thickness sensor. A compensator is provided to perform optimum automatic thickness control even during the dead time due to the distance between the calendar roll and the thickness sensor.

The compensation pattern of the gap compensator for the axle box can be calculated and set from the rolling material and the mechanical structure, but when the number of calendar rolls increases, the roll interference and the roll axis box are supported. Calculation of frame deformation is very difficult. Therefore, it is simple and accurate to set the compensation pattern by actual measurement in the production state. In actual measurement, the speed is changed while recording the sheet thickness, the axial box gap, the roll speed, the current of the roll drive motor and the rolling load in an uncontrolled state. At this time, the variation of the sheet thickness is measured and patterned.

Since the variation amount depends on the thickness setting value,
Data is collected at several thickness settings. The amount of thickness variation is corrected by recording the rolling load. The smaller the number of calendar rolls, the more easily it is affected by the bank and material, so the more actual measurement data the better. When the number of calendar rolls is large, the final rolling conditions are stable, so it is sufficient to only compensate for the speed, but when the number of calendar rolls is small, the amount of change in the rolling load or axle box gap, especially 2 rolls In the case of roll, it is necessary to correct the compensation pattern by the current of the roll drive motor, and fuzzy calculation is suitable for such calculation.

An example of the variation pattern of the sheet thickness with respect to the speed thus measured is shown in FIG. By equipping the compensating device as described above, the thickness change due to the speed change and the rolling load change is applied to the gap correction operation to perform the high-speed and continuous compensation to minimize the thickness fluctuation. Is possible.

[0013]

The operation of the automatic thickness control device for the calendar device according to the present invention will be described at the same time in the description of one embodiment described below.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a calendar roll gap compensation controller for a calendar device of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of a calendar roll gap compensation control device for a calendar device according to the present invention, in which the same symbols as in FIG. 2 indicate the same functional parts.

The mechanical portion of the calendar device is similar to that shown in FIG. 1, and a pair of calender rolls 1a and 1b and a shaft box 2a axially supporting the pair of calender rolls 1a and 1b, respectively.
And 2b and 2c and 2d, the gap motor 5a for moving the positions of the shaft boxes 2a and 2b engaged with both ends of one of the pair of calendar rolls 1a and 1b in order to change the gap of the calendar rolls. And 5b etc. A drive motor 8 is provided to drive the other calendar roll 1b, and a pair of calendar rolls 1a and
Thickness sensors 9a and 9b are provided near both ends of the sheet 7 on the delivery side of the sheet 7 of 1b, and a pair of load cells 10a and 10b for detecting the rolling load of the sheet 7 are provided at both ends of the calendar roll 1a. Twin axle boxes 2a and 2c and
Gap sensors 11a and 11b are provided for detecting the respective gaps ε1 and ε2 between 2b and 2d.

The drive motor controller 15 controls the drive motor 8 by receiving the speed command signal g as an input and sending a motor speed command signal v to the drive motor 8 to receive feedback from the speed detector 18 of the drive motor 8. The CT detects the drive current and outputs the motor load signal j. Gap motor
5a and 5b are controlled by gap control devices 16a and 16b which have the outputs of the gap calculation devices 12a and 12b as inputs. Rolling load signals f1 and f2 are output from the load cells 10a and 10b, respectively. Gap sensor 11a and 11b
Outputs the gap signals b1 and b2 between the shaft boxes, respectively. Thickness sensors 9a and 9b near both ends of the calendar roll
Output thickness detection signals c1 and c2, respectively. The thickness calculating device 14 calculates a deviation signal between the preset thickness setting signal a and the thickness signals c1 and c2 from the thickness sensors 9a and 9b, and outputs the deviation signals k1 and k2 to the gap compensating device 13.

The difference from the conventional calendering device is that the gap computing devices 12a and 12b for controlling the gap motors 5a and 5b, respectively, according to the deviation between the thickness setting signal a and the gap signals b1 and b2, are compensated by the gap compensating device 13. That is, the signals d1 and d2 are respectively taken in. This gap compensating device 13 includes a calendar roll 1a and
In order to compensate the dead time due to the distance between 1b and the thickness sensor 9, the thickness detection signals from the thickness sensors 9a and 9b
Regardless of c1 and c2, various conditions for correcting the gap between the axle boxes with respect to the completion of the sheet 7 are input.

Although all the circuits used in all the embodiments are shown in FIG. 1 at the same time, in the first embodiment, as the various conditions given to the gap compensating device 13, a preset thickness setting signal a , Gap sensors 11a and 11b
Gap signals b1 and b2 between the axial boxes from the load cell and rolling load signals f1 and f from the load cells 10a and 10b, respectively.
2. A speed command signal g from a speed command device (not shown) and thickness deviation signals k1 and k2 from the thickness calculator 14 are input. Instead of the rolling load signals f1 and f2 from the load cells 10a and 10b, respectively, in the second embodiment, the thickness setting signal a is input and the gap signals b1 and b2 between the axle boxes from the gap sensors 11a and 11b, respectively. Is used as the mechanical deformation amount, and in the third embodiment, the drive motor 8
The load signal j for monitoring the output of is input to replace the rolling load signal.

Gap compensator constructed as described above
13 calculates and predicts the rolling state change as the gap change amount, and outputs the gap compensation signals d1 and d2 to the calculators 17a and 17b.
Is output and is added to the gap command as compensation to suppress the thickness variation and to speed up the response when the thickness is changed.

In the present embodiment, the case of a pair of calender rolls has been described, but even in a calender apparatus having two or three pairs of calender rolls, this method can be adopted for the calender rolls at the final stage. Is.

Next, the operation will be described. When the calendar device is operating, as described above, the thickness fluctuation between the calender rolls 1a and 1b and the thickness sensors 9a and 9b cannot be controlled by the conventional device. In the present invention, in the meantime, instead of the thickness signals c1 and c2 from the thickness sensors 9a and 9b, the compensation signals d1 and d2 of the gap compensator 13 are given to the gap motor control system as the variation correction value of the thickness.

That is, for the sheet 7 of resin, rubber or the like, the thickness setting signal a, the gaps ε1 and ε2 between the shaft boxes by the setting signal a, and the motor speed command signal v are set.
Driven by a drive motor 8 that rotates by the calendar roll 1
It is sent from between a and 1b. Of course gap motor 5
a and 5b are calculators 17a and 17b, and gap calculators 12a and 12b.
And the gap motor control devices 16a and 16b.

The sheet 7 thus sent out is
Between the calender rolls 1a, 1b and the thickness sensors 9a, 9b, which cannot be controlled by this system, the gap compensator 13
Compensates for this point.

In the gap compensator 13, the thickness setting signal a, which is also input to the gap calculators 12a and 12b, the speed command signal g from the speed commander, and the deviation signals k1 and k2 from the thickness calculator 14. The load signal j of the drive motor 8, the rolling load signals f1 and f2 from the load cells 10a and 10b, and the gap signals b1 and b2 from the gap sensors 11a and 11b are input, and the outputs d1 and d2 are calculated. Gap motor control devices 16a, 16b via the controllers 17a, 17b and the gap calculation devices 12a, 12b.
Is input to. A gap control signal m1 is given to the gap motor 5a from the gap motor control device 16a, and a gap control signal m2 is given to the gap motor 5b from the gap motor control device 16b.

As described above, the gap compensator 13 corrects the dead time until the thickness detection and the short cycle fluctuation such as the fluctuation of the rolling condition, and the thickness detection signal is corrected for the long cycle fluctuation. The feature of the automatic thickness control device of the calendar device of the present invention is that a thickness control method that controls both of the thickness control by the above is adopted.

[0027]

As described above, according to the present invention,
High-speed response when changing the thickness setting is possible, and it is possible to prevent the thickness variation when changing the speed, and also to prevent the thickness variation due to the bank variation.

Therefore, the calender roll gap compensation control device of the calender device of the present invention is a calender roll gap compensation control device which is extremely useful in a calender device for substances such as resin and rubber.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a calendar roll gap compensation control device for a calendar device according to the present invention.

2A and 2B are diagrams showing a basic structure of a calendar device, in which FIG. 2A is a front view and FIG. 2B is a side view.

FIG. 3 is a graph showing an example of actual measurement of a variation pattern of sheet thickness with respect to speed.

[Explanation of symbols]

1a, 1b Calendar rolls 2a, 2b, 2c, 2d Axle box that supports the calendar rolls 3a, 3b Frames that support the axle boxes 4a, 4b Push screws that adjust the gap between the calendar rolls 5a, 5b Gap motors 6a, 6b Gap motors Converter that converts the rotation of the machine into the movement amount of the push screw 7 Sheet 8 Drive motor to drive the calendar roll 9 Thickness sensor 10a, 10b Load cell 11a, 11b Gap sensor 12a, 12b Gap calculator 13 Gap compensator 14 Thickness calculator Device 15 Drive motor controller 16a, 16b Gap motor controller 17a, 17b Adder / subtractor 18 Drive motor speed detector 19 Bank of rolled material ε1, ε2 Gap between axial boxes a Pre-set thickness setting signals b1, b2 Gap signal c1, c2 Thickness detection signal d1, d2 Compensation signal e Material signal f1, f2 Rolling load signal g Speed command signal h Temperature signal j Load signal k1, k2 Deviation signal m1, m2 Gi Control signal v Motor speed command signal

Claims (4)

[Claims] 1. A thickness sensor (9a, 9b) for detecting a thickness of a molded sheet (7) and a thickness detection signal (c1, c2) in a calendar device for molding a substance such as resin or rubber into a sheet. ), And the gap detection signals (b1, b2) by detecting the gaps (ε1, ε2) between the axle boxes (2a, 2b, 2c, 2d) supporting the calendar rolls (1a, 1b).
Gap sensor (11a, 11b) that outputs is attached, and thickness detection signals (c1, c2) from the thickness sensor (9a, 9b)
Automatic thickness control device that uses the thickness deviation signal (k1, k2) output of the thickness calculation device (14) as feedback to the gap calculation device (12a, 12b) as feedback of the gap detection signal (b1, b2) In (1), a gap compensator (13) is provided for outputting a velocity compensation signal (d1, d2) with a fluctuation value corresponding to the velocity change or a value proportional thereto as a shaft box gap compensation amount, and the thickness deviation signal (b1, b2) is provided. In addition to the above, an automatic thickness control device for a calendar device is characterized in that it compensates for speed changes. 2. The speed compensation signals (d1, d2) are corrected by the rolling load signals (f1, f2) to compensate for fluctuations in the bank (18) in the variable speed operation state and the low speed operation state. The automatic thickness control device for a calendar device according to claim 1. 3. The calendar according to claim 2, wherein a thickness setting signal (a) -gap detection signal (b1, b2) is used as the mechanical deformation amount in place of the rolling load signal (f1, f2). Automatic thickness control device for equipment. 4. The calendar device according to claim 2, wherein the current detection value of the roll (1b) drive motors (5a, 5b) is used as the rolling load instead of the rolling load signals (f1, f2). Automatic thickness control device.