JP3023267B2 - Automatic thickness control device for calendar device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a gap deviation command as an output of a thickness deviation calculator for calculating a deviation between a set value of a sheet and a detected value in order to control the thickness of a sheet to be constant, and supports a calendar roll. The present invention relates to an automatic thickness control device for a calendar device that controls the movement of a shaft 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 shaft 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 calendar speed, the material, the roll gap and the bank (the amount of material accumulated between the calendar rolls). receive.

FIGS. 2A and 2B show the basic structure of a calendar device. FIG. 2A is a front view, FIG. 2B is a side view, 1a and 1b are calendar rolls, 2a and 2b, and 2c and 2d are calendar rolls, respectively. Axle box supporting 1a and 1b, 3a and 3b respectively
Frames supporting 2a and 2c and 2b and 2d, 4a and 4b are set screws for adjusting the gap between calendar rolls 1a and 1b, 5a and 5b are gap motors, and 6a and 6b are rotations of gap motors 5a and 5b, respectively. Is a converter for converting the amount of movement of the push screws 4a and 4b, and 7 is a sheet. 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 on the frames 3a and 3b so that the gap between the axle boxes 2c and 2d can be adjusted. Have been.

When the sheet 7 is formed by such an apparatus, a very large rolling load is applied to the calendar rolls 1a and 1b, and as a result, deformation of the calendar rolls 1a and 1b, deformation of the push screws 4a and 4b, and The deformation of the frames 3a and 3b occurs. The sum of these deformation amounts may affect the thickness of the sheet 7 to be formed by several tens to more than 100%.

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

[0006]

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

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

[0008]

An automatic thickness control device for a calendar device according to the present invention includes a thickness sensor for detecting a thickness of a formed sheet and outputting a thickness detection signal, and a shaft box for supporting a calendar roll. Attach a sensor for detecting a gap between boxes and outputting a gap detection signal, and output a thickness deviation signal of a thickness calculation device using the thickness detection signal from the thickness sensor as feedback, and a gap calculation device using the gap detection signal as feedback. In the automatic thickness control device that controls the gap between the axle boxes by the gap motor control device using the gap calculation device, a variation value corresponding to the speed change or a value proportional thereto is set as the axle box gap compensation amount, and A gap compensator for outputting a compensation signal is provided to compensate for a speed change in addition to the thickness deviation signal. It is characterized in.

That is, in order to achieve the object, a thickness control method for forming a sheet by using a calender for a substance such as resin or rubber comprises a pair of calender rolls and a pair of calender rolls for supporting the pair of calender rolls. And a gap motor that engages with the axle box and is located at both ends of the calendar roll, the gap motor being configured to drive one calendar roll of the pair of calendar rolls to vary the gap between the calendar rolls. And a thickness sensor provided on the feed side of the sheet of the calendar roll, and a gap sensor located at both ends of the calendar roll to detect a gap between the shaft boxes of the pair of calendar rolls. Or, in some cases, load cells located at both ends of a calendar roll that detects the rolling load of the sheet. A gap calculation device configured to control a gap motor based on a deviation between a thickness setting signal and a gap detection signal, and a gap that corrects a gap between the axle boxes in accordance with a completed sheet regardless of a thickness detection signal of a thickness sensor. A compensator is provided to perform optimal automatic thickness control even during a dead time due to the distance between the calendar roll and the thickness sensor.

The compensation pattern of the gap compensating device for the axle box can be calculated and set from the rolling material and the mechanical structure. However, when the number of calendar rolls increases, the interference of the rolls and the support for the roll axle box are supported. Calculation of frame deformation is very difficult. Therefore, it is easy and accurate to set the compensation pattern by actual measurement in a production state. In the actual measurement, the speed is changed while recording the sheet thickness, the axle 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 amount of change differs depending on the thickness setting value,
Data is collected at several thickness settings. The thickness variation is corrected by recording the rolling load. The smaller the number of calendar rolls is, the more easily the influence of the bank and the material is. When the number of calendar rolls is large, the final rolling condition is stable, so only compensation for the speed may be used. However, when the number of calendar rolls is small, the change in the rolling load and the gap of the axle box, especially two In the case of a roll, it is necessary to correct the compensation pattern by the current of the roll drive motor, and a fuzzy calculation is suitable for such a calculation.

FIG. 3 shows an example of the variation pattern of the sheet thickness with respect to the actually measured speed. By equipping the compensation device as described above, the thickness change at the time of speed change or rolling load change is applied to the gap correction operation, and high-speed and continuous compensation is performed to minimize the thickness change. Is possible.

[0013]

The operation of the automatic thickness control device of the calendar device according to the present invention will be described simultaneously in the following description of an embodiment.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a calendar roll gap compensation control device for a calendar device according to the present invention will be described in detail 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. The same reference numerals as in FIG. 2 denote the same functional parts.

As shown in FIG. 1, the mechanical part of the calendar device includes a pair of calendar rolls 1a and 1b and a shaft box 2a for supporting the pair of calendar rolls 1a and 1b.
And 2b, 2c and 2d, and a gap motor 5a for moving the positions of the shaft boxes 2a and 2b engaged with both ends of one of the calender rolls 1a of the pair of calender rolls 1a and 1b to change the gap between the calender rolls. And 5b. A drive motor 8 is provided to drive the other calendar roll 1b, and a pair of calendar rolls 1a and
1b, thickness sensors 9a and 9b are provided near both ends of the sheet 7 on the sending side of the sheet 7, and a pair of load cells 10a and 10b for detecting a 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 respective gaps ε1 and ε2 between 2b and 2d.

The drive motor control device 15 receives the speed command signal g as an input, sends a motor speed command signal v to the drive motor 8, receives feedback from the speed detector 18 of the drive motor 8, and controls the drive motor 8. The CT detects the drive current and outputs a motor load signal j. Gap motor
5a and 5b are controlled by gap control devices 16a and 16b which receive 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 sensors 11a and 11b
Output gap signals b1 and b2 between the axle boxes, respectively. Thickness sensors 9a and 9b near both ends of the calendar roll
Output thickness detection signals c1 and c2, respectively. The thickness calculator 14 calculates a deviation signal between a 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 compensator 13.

The difference from the conventional calender is that gap calculators 12a and 12b that control gap motors 5a and 5b based on the deviation between the thickness setting signal a and the gap signals b1 and b2 respectively provide compensation from the gap compensator 13. This is to take in the signals d1 and d2, respectively. The gap compensator 13 includes a calendar roll 1a and a
In order to compensate for 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 are used.
Regardless of c1 and c2, various conditions for correcting the gap between the axle boxes with respect to the finished sheet 7 are input.

FIG. 1 shows all the circuits used in all the embodiments at the same time. However, in the first embodiment, various conditions to be applied to the gap compensator 13 include a preset thickness setting signal a. , Gap sensors 11a and 11b
, The gap signals b1 and b2 between the axle boxes, and the load cells 10a and 10b provide the rolling load signals f1 and f, 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, a thickness setting signal a is input, and gap signals b1 and b2 between the axle boxes from the gap sensors 11a and 11b, respectively. Is used as the amount of mechanical deformation, and in the third embodiment, the drive motor 8
, A load signal j for monitoring the output is input and replaced with a rolling load signal.

The gap compensating device configured as described above.
13 calculates and predicts the rolling state change as a gap change amount, outputs the speed compensation signals d1 and d2 of the gap to the calculators 17a and 17b, adds the compensation to the gap command, suppresses the thickness variation, and suppresses the thickness change. I try to make the response faster.

In this embodiment, a case of a pair of calendar rolls has been described. However, in a calendar apparatus having two or three pairs of calendar rolls, the present method can be applied to the last-stage calendar roll. It is.

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

That is, the sheet 7 made of resin, rubber, or the like has a thickness setting signal a, the gaps ε1 and ε2 between the axle boxes based on the setting signal a, and a motor speed command signal v
The calendar motor 1 is rotated by the drive motor 8
It is sent between a and 1b. Of course gap motor 5
a and 5b are computing units 17a and 17b, and gap computing devices 12a and 12b
And the gap motor control devices 16a and 16b.

The sheet 7 sent out in this manner is
A gap compensator 13 is provided between the calender rolls 1a, 1b and the thickness sensors 9a, 9b, which cannot be controlled by this system.
Compensates for this.

The gap compensator 13 has a thickness setting signal a also input to the gap calculators 12a and 12b, a speed command signal g from a speed commander, and 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, the gap signals b1 and b2 from the gap sensors 11a and 11b, and the like. Gap motor control devices 16a, 16b via devices 17a, 17b and gap calculation devices 12a, 12b
Is input to A gap control signal m1 is supplied to the gap motor 5a from the gap motor control device 16a, and a gap control signal m2 is supplied to the gap motor 5b from the gap motor control device 16b.

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

[0027]

As described above, according to the present invention,
A high-speed response at the time of changing the thickness setting can be achieved, and the fluctuation of the thickness at the time of changing the speed can be prevented. Further, the fluctuation of the thickness due to the bank fluctuation can be prevented.

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

[Brief description of the drawings]

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

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

FIG. 3 is a graph showing an example in which a fluctuation pattern of a sheet thickness with respect to a speed is actually measured.

[Explanation of symbols]

1a, 1b Calendar roll 2a, 2b, 2c, 2d Shaft box supporting calendar roll 3a, 3b Frame supporting shaft box 4a, 4b Set screw for adjusting the gap between calendar rolls 5a, 5b Gap motor 6a, 6b Gap motor Converter to convert the rotation of the screw into the amount of movement of the push screw 7 Sheet 8 Drive motor for driving 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 control device 16a, 16b Gap motor control device 17a, 17b Adder / subtractor 18 Drive motor speed detector 19 Bank of rolling material ε1, ε2 Gap between axle boxes a Preset thickness setting signals b1, b2 Gap detection signal c1, c2 Thickness detection signal d1, d2 Speed 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 gap control signal v motor speed command signal

Continuation of the front page (56) References JP-A-7-148757 (JP, A) JP-A-6-170876 (JP, A) JP-A-56-62124 (JP, A) JP-A-62-151311 (JP) , A) (58) Field surveyed (Int. Cl. ⁷ , DB name) B29C 43/22-43/24 B29C 43/44-43/46 B29C 43/58

Claims (4)

(57) [Claims] 1. A thickness sensor (9a, 9b) for detecting a thickness of a formed sheet (7) and outputting a thickness detection signal (c1, c2) in a calendar device for forming a material such as resin or rubber into a sheet shape. ), The gap detection signal (b1, b2) is detected by detecting the gap (ε1, ε2) between the axle boxes in the axle boxes (2a, 2b, 2c, 2d) supporting the calendar rolls (1a, 1b).
The gap sensors (11a, 11b) that output the signals are attached, and the thickness detection signals (c1, c2) from the thickness sensors (9a, 9b) are attached.
The output of the thickness deviation signal (k1, k2) of the thickness calculator (14) using the feedback as the input to the gap calculator (12a, 12b) using the gap detection signal (b1, b2) as the feedback, In the automatic thickness control device which controls the gap between the axle boxes by the gap motor control devices (16a, 16b) by using the speed compensation signal (a variation value corresponding to the speed change or a value proportional thereto) as the axle box gap compensation amount ( A gap compensator (13) for outputting d1, d2) is provided, and the speed compensation signal (d1, d2) is added to the gap detection signal (b1, b2) as feedback to compensate for a speed change. Automatic thickness control device of the calendar device. 2. The method according to claim 1, wherein the speed compensation signal (d1, d2) is corrected by a rolling load signal (f1, f2), and compensation for fluctuations in the bank (18) between the shift operation state and the low speed operation state is performed. 2. The automatic thickness control device for a calendar device according to claim 1, wherein: 3. A "thickness setting signal (a) -a gap detection signal (b1, b2)" instead of the rolling load signal (f1, f2).
3. The automatic thickness control device for a calendar device according to claim 2, wherein: 4. The automatic thickness of a calendar device according to claim 2, wherein a current detection value of a roll (1b) drive motor (5a, 5b) is used instead of the rolling load signal (f1, f2). Control device.