JPH03279144A - Method of controlling press roller in winder, and device therefor - Google Patents

Abstract

PURPOSE:To eliminate wrinkles produced on a milling roll and caused by an increase in the diameter of wind-up and edge slippage at both ends of the roll or the like by compensating a press reference value computed by a press force setting computer, in accordance with a wind-up diameter deviation value obtained from a wind-up diameter setting computer and a wind-up diameter computer. CONSTITUTION:A computer 23 computes a reference press value in accordance with a theoretical wind-up diameter, a speed signal from a band-like material running speed detector 10 and a signal from an air trapping volume setting unit 3. Meanwhile, a theoretical wind-up diameter by which a predetermined air trapping volume is obtained during a period from the initiation of wind-up to that time, is compared with an actual diameter, and the reference press value is compensated by the result of comparison. A control device 25 controls the press force of a press roller 7 in accordance with the compensated reference press value so that a band-like material can be wound up with a predetermined air trapping value from the initiation of wind-up to the termination of the wind-up.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is directed to a winding machine applied to, for example, a biaxially stretched film manufacturing device, a non-stretched film manufacturing device, a winding device for paper, cloth, etc. This invention relates to a pressure roll control device.

(Prior Art) A conventional belt-shaped material winding device will be described below, taking a film manufacturing device as an example. Conventional winding devices have had problems such as wrinkles occurring in the strip as the winding diameter increases, and edges shifting at both ends of the roll, but known technology has been developed to solve these problems. For example, there is one described in JP-A-63-37055.

This prior art will be explained based on FIG. 2. 9 is a film as a running strip, 1 is a guide roll 8
The mill roll is wound through the mill roll and is driven by a variable speed motor 2. Also engaged with the variable speed motor 2,
A rotation speed detector 11 for detecting the rotation speed of the motor 2 is provided. 10 is a speed detector for detecting the winding speed of the film, and 7 is a pressure roll, which is rotatably supported by a movable arm 6 that swings by an air cylinder 5 that is a pressure force adjustment device. 26 is an electric/pneumatic converter that adjusts the compressed air sent to the air cylinder 5 as the pressure adjustment device. Note that 3 is an amplifier. And these codes 1,
The winding portion is constituted by each member indicated by 2.3°24.5 to 11.

Also, a winding diameter calculator 17 calculates the winding diameter of the mill roll 1 based on the signals from the speed detector 10 and the rotation speed detector 11, a speed detector 10 for calculating the set winding diameter of the mill roll 1,
It consists of a set winding diameter calculator 18 that calculates a set winding diameter by inputting signals from a film thickness setting device 12, an air entrainment amount setting device 13, a winding start signal 14, etc. The output signal is inputted to the adder/subtractor 16 as the reference setting value of the set winding diameter, and at the same time, the winding diameter feedback value from the winding diameter calculator 17 is also inputted to the adder/subtractor 16 to calculate the winding diameter deviation and calculate the deviation. Of these members, symbols 12, 13, 14, 16 and 17.1 send signals to the amplifier 3 of the winding section.
The press control device 20 is constituted by each device shown in 8.

Next, to explain the operation with reference to FIG. 2, the film 9 as a belt-shaped material guided from a pre-process (not shown) is wound onto a core 19 driven by a variable speed motor 2 via a speed detector 1O and a guide roll 8. taken. At this time, the pressing force of the pressing roll 7 is adjusted as follows.

Film speed from speed detector 10 and rotation speed detector 11
The winding rotation speed is input to the winding diameter calculator 17 to calculate the winding diameter, and the calculated value is input to the adder/subtractor 16.

On the other hand, the film thickness setting device 12 sets the film thickness, and the air entrainment amount setting device 13 sets the thickness of the air layer between the wound films (the amount of air entrainment in each layer is set constant). The setting signal is input to the set winding diameter calculator 18 to obtain the total thickness of the film and the air layer, and the set winding diameter is calculated from the film speed signal from the speed detector 10 and the winding start signal 14. , and inputs the calculated value to the adder/subtractor 16 as the standard setting value of the winding diameter.

This adder/subtracter 16 uses the winding diameter value (
The winding diameter feedback value) is compared with the reference setting value (set winding diameter value) of the winding diameter to obtain a winding diameter deviation value (winding diameter deviation value, general fixed winding diameter value, one winding diameter feedback value). The winding diameter deviation value is amplified by the amplification device 3, the amplified signal is sent to the electric/pneumatic converter 26 to adjust the compressed air, and this is sent to the air cylinder 5, which is a pressure adjustment device. , the air cylinder 5 is operated to swing the movable arm 6 and press the press roll 7 against the mill roll 1, thereby controlling the press.

That is, controlling the pressure so that the winding diameter becomes the set winding diameter in this way results in controlling the amount of air entrainment (thickness of the air layer). Therefore, this pressure control is a method for directly controlling the amount of air entrainment (thickness of the air layer).

In addition, as another conventional example, a Taber setting device, etc. may be added to the above example, and this controls the air intake amount with arbitrary characteristics such as gradually increasing or decreasing the set value from the beginning of winding to the end of winding. There are some things that can be done.

(Problem to be Solved by the Invention) When winding a film, etc., the amount of air trapped between the film layers varies depending on the pressure of the presser roll, the winding speed (line speed) of the film, and the winding diameter. However, as shown in FIG. 2, in the conventional technology described above, the pressure value, that is, the input signal to the electric/pneumatic converter 26 is simply calculated by calculating the theoretical winding diameter (set winding diameter) and the measured winding diameter. Since the calculation is based on a comparison calculation with the winding diameter, that is, the feedback number of the winding diameter, there are the following drawbacks.

(1) When the line speed is changed during winding, the amount of air entrainment changes, but the pressure does not correspond immediately, and the pressure is corrected after a deviation occurs between the measured winding diameter and the set winding diameter. , a control delay occurs.

(2) If the setting of the amount of air entrainment is changed during winding, a control delay will occur as in item 1 above.

(3) Since the change in the amount of air entrainment for the same pressure change, that is, the process gain, changes depending on the winding diameter, the optimal control gain of the winding diameter deviation amplifier varies depending on the winding diameter. However, if the total amount of pressure is controlled by the output of the winding diameter deviation amplifier as in the conventional technology, if the winding diameter ratio (the ratio of the winding core diameter to the full winding diameter) is large, the gain will not be adequate within a certain winding diameter range. Even if there is, it becomes inappropriate if it deviates from this range, and it is difficult to stably control the entire range.

The present invention has been proposed to solve the above-mentioned conventional problems.

(Means for Solving the Problems) For this reason, the present invention provides a press roll of a winding machine that winds up a strip-like material such as a film while pressing a mill roll of the strip-like material formed by winding it around a core with a pressure roll. In the control method,
A signal from a rotation speed detector that detects the rotation speed of the mill roll as the winding progresses, a signal from an air entrainment amount setting device, a signal from a preset strip thickness setting device or a strip thickness gauge, Calculating the theoretical winding diameter of the mill roll based on the winding start signal, and calculating the actual winding diameter of the mill roll based on the signal from the belt running speed detector and the signal from the rotation speed detector, Furthermore, a reference pressure value is calculated based on the theoretical winding diameter, the speed signal from the belt running speed detector, and the signal from the air entrainment amount setting device. Compare and calculate the theoretical winding diameter and the actual winding diameter for which the winding amount has been obtained, correct the reference pressure value based on the result of this calculation, and use the corrected reference pressure value from the start of winding to the end of winding. The pressing force of the pressing roll is controlled so that the strip can be wound up with a predetermined amount of air entrainment, and this is a means for solving the problem.

The present invention also provides a press roll that presses a mill roll of a strip of film or the like formed by being wound around a core, a press control device that controls the press roll, and a press roll that rotatably supports the press roll. In a winding machine having a swinging arm and a pressure adjustment device connected to the arm to adjust the pressing force of a pressing roll, the pressing control device receives a signal from a strip traveling speed detector and a rotation speed of the mill roll. a winding diameter calculator that calculates the actual winding diameter of the mill roll based on the signal from the rotational speed detector that detects the rotational speed detector, and the signal from the rotational speed detector;
A set winding diameter calculator that calculates the theoretical winding diameter of the mill roll based on a signal from an air entrainment amount setting device, a signal from a preset strip thickness setting device or a strip thickness gauge, and a winding start signal. and a setting pressure for calculating a pressure reference value based on the theoretical winding diameter value from the set winding diameter calculator, the speed signal from the strip traveling speed detector, and the signal from the air entrainment amount setting device. the pressure reference value calculated by the setting pressure calculation unit is corrected by the winding diameter deviation value from the setting winding diameter calculation unit and the winding diameter calculation unit,
This is a means to solve problems.

(Function) According to the present invention, the pressure reference value of the pressure roll is determined from time to time using a theoretical formula with the conditions of a predetermined amount of air entrainment, the traveling speed of the strip, and the winding diameter, and the pressure of the pressure roll is controlled. Therefore, it is possible to eliminate wrinkles, misalignment of edges at both ends of the roll, etc. that occur on the mill roll as the winding diameter increases in the winding device.

(Example) Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

FIG. 1 shows an embodiment of the present invention, where 9 is a running film, 1 is a mill roll wound around a core 19 via a guide roll 8, and is driven by a variable speed motor 2. The motor is equipped with a rotation speed detector 1.
1 is provided. Reference numeral 10 denotes a belt speed detector for detecting the running speed of the film, and 7 a pressing roll, which is connected to a rod 6 of an air cylinder 5, which is a pressing force adjusting device. 26 is an electric/pneumatic converter that adjusts the pressure of compressed air sent to the air cylinder, and these symbols 1.2.5 to IL1
The members indicated by 9 and 26 constitute a winding section for the strip.

In order to control the press roll to prevent wrinkles and misalignment of the mill roll 1, a strip (film) thickness setting device 12 or a strip (film) thickness meter 22, an air entrainment amount setting device 13, and a winding core drive are used. A set winding diameter calculator 21 is provided which reads and calculates signals from a motor rotation detector 11, a winding start signal 14, etc. Due to the signal of
A winding diameter calculator 17 is provided to calculate the actual winding diameter of the mill roll. Further, a deviation amplification device 3 which compares and amplifies both outputs from the set reel diameter calculator 21 and the reel diameter calculator 17 with an adder/subtractor 16 also operates a deviation amplification device 3 which amplifies the outputs from the set reel diameter calculation unit 21 and the reel diameter calculation unit 17 according to the film running speed and the reel diameter. In order to obtain the pressure value necessary to obtain the amount of air entrainment, a theoretical pressure value is calculated based on the signals from the strip speed detector 10, the air entrainment setting device 13, and the set winding diameter calculator 21, and the reference pressure value is calculated. A setting press calculator 23 is provided which outputs the following. The reference pressure signal from the set pressure calculation unit is configured to be added to the output signal from the deviation amplification device 3 in an adder 24, and the output signal from this adder 24 is used as the pressure command value. The signal is sent to an electric/pneumatic converter 26. Among these members, the press control device 25 is constituted by devices indicated by reference numerals 3.12 to 14, 16.17, 21.23.24.

By the way, the relationship between the pressing force and the amount of air entrainment, which is the main focus of the present invention, will be explained below.P is the pressing force, h is the amount of air entrainment (thickness of the air layer between the wound films), and is the thickness of the rolled film. When the speed is υ and the winding diameter is R, the following relationship holds true.

Here, k is a constant determined by air viscosity, film surface condition, winding tension, etc.

As is clear from the formula (1) above, even if the winding diameter increases as the winding progresses, the line speed changes during winding, or the setting of the air intake amount changes, the pressure can be determined by the formula (1) above. It can be seen that if the values are calculated and controlled, a predetermined amount of air entrainment can be obtained from the beginning of winding to the end of winding.

Next, the operation of the embodiment shown in FIG. 1 will be explained. First, to explain the set winding diameter calculator 21, the set winding diameter calculator 2
1, when the winding diameter start signal 14 is closed and winding is started, the rotation speed n of the variable speed motor 2 is read from the rotation detector 11, and the rotation speed of the winding core 19 is determined from this value. Each time the winding core 19 rotates once (if the calculation speed of the set winding diameter calculator is a problem, it may be every fixed number of revolutions), the winding is performed on the winding core 19 using the film thickness setting device 12 or the film thickness gauge 22. The film thickness t to be determined is set by the air entrainment setting device 13
The target thickness h of the air layer is read, and the theoretical winding diameter R when the winding is performed according to the set value is calculated using the following formula (2).

In formula (2), Ro is the outer diameter of the winding core 19.

t, hi is the winding core 19! Shows the film thickness setting value and air entrainment setting value read in each rotation, of which t8 can be changed during the winding process, or input online from the film thickness meter 22 instead of the film thickness setting device 12. Since other methods are also possible, a method is adopted in which t and +hi are read every rotation of the winding core 19 and integrated. Incidentally, the winding diameter of the mill roll 1 when the winding core 19 rotates without any setting change is R0+2m+ (t 10h).

The set pressure calculator 23 calculates the winding diameter R obtained by the set winding diameter calculator 21, the speed detector 1o, and the air entrainment amount setter 1.
After reading the film speed υ and the target air layer thickness h from 3 and determining the reference pressure value P using the theoretical formula shown in equation (1) above, the characteristics of the electric/pneumatic converter 26, air cylinder 5, etc. Based on this, a calculation is performed to convert the input electric signal to the t/empty converter 26 necessary to make the pressure of the press roll 7 on the mill roll 1 P, and output it to the adder 24.

Basically, a predetermined amount of air entrainment can be obtained by the above-mentioned action, but in actual winding, the constant k in equation (1) may change depending on the operating conditions, or the electric/pneumatic converter 2
Due to changes in the characteristics of the air cylinder 5 for the press roll 6 and the pressure roll 7, some errors may occur. In order to correct this error, a winding diameter calculator 17
The actual winding diameter Rf obtained in PI (proportional integral) is
Calculate and output to the adder 24 via the deviation amplifier 3,
This adder 24 performs addition for the purpose of correcting the signal from the set pressure calculation unit 23, and outputs it to the electric/pneumatic converter 26 as a final pressure command value.

(Effects of the Invention) As described in detail above, according to the present invention, the theoretical calculation formula for determining the reference value of the pressure is based on the amount of air entrainment, the line speed,
Since the winding diameter is calculated as an input parameter, even if there is a change in line speed or setting of air intake amount during winding, the pressing force will be immediately changed to the appropriate value, and there will be no control delay. In addition, the pressure value is almost determined by a theoretical calculation formula, and the feedback signal of the winding diameter, which was an unstable factor in the conventional technology, only acts as a minute pressure correction value that corrects the error between the theoretical calculation formula and the actual value. Therefore, stable control is possible even when winding with a large winding diameter ratio.

Therefore, it is possible to eliminate the wrinkles that occur on the mill roll as the winding diameter increases in the winding device, the misalignment of the edges at both ends of the roll, etc., and it is possible to obtain a rolled product of a film or other belt-like material with a good winding appearance.

[Brief explanation of drawings]

FIG. 1 is a system diagram of a press roll control device according to an embodiment of the present invention, and FIG. 2 is a system diagram showing a conventional press roll control device. Explanation of main parts of the figure 1 - Mill roll 6 - Movable arm 7 - Press roll 1 - Discharge speed detector 11 - Rotation detector 12 - Film thickness setting device 13 - Air entrainment amount setting device

Claims (2)

[Claims] (1) In a method for controlling a press roll of a winder that winds a strip of film or the like formed by winding it around a winding core while pressing the mill roll of the strip with a pressure roll, the mill roll rotates as the winding progresses. Based on the signal from the rotation speed detector that detects the number of rotations, the signal from the air entrainment amount setting device, the signal from the preset strip thickness setting device or strip thickness meter, and the winding start signal. Calculating the theoretical winding diameter of the mill roll, and calculating the actual winding diameter of the mill roll based on the signal from the belt running speed detector and the signal from the rotation speed detector, and further calculating the theoretical winding diameter, A reference pressure value is calculated based on the speed signal from the strip running speed detector and the signal from the air entrainment amount setting device, and it is assumed that a predetermined amount of air entrainment has been obtained from the beginning of winding to that point. A comparison calculation is made between the theoretical winding diameter and the actual winding diameter, the reference pressure value is corrected based on the result of this calculation, and based on the corrected reference pressure value, a belt is formed with a predetermined amount of air entrainment from the start of winding to the end of winding. A method for controlling a press roll of a winder, comprising controlling the pressing force of the press roll so that an object can be wound up. (2) A press roll that presses a mill roll of a strip such as a film wound around a core, a press control device that controls the press roll, and a swing arm that rotatably supports the press roll. and a pressure adjusting device connected to the same arm to adjust the pressing force of the pressing roll, wherein the pressing control device detects a signal from a strip running speed detector and the rotation speed of the mill roll. a roll diameter calculator that calculates the actual winding diameter of the mill roll based on the signal from the rotation speed detector, the signal from the rotation speed detector, the signal from the air entrainment amount setting device, and a preset band a set winding diameter calculator that calculates the theoretical winding diameter of the mill roll based on a signal from a material thickness setting device or a strip thickness meter and a winding start signal;
a set pressure calculator that calculates a pressure reference value based on a theoretical winding diameter value from the set roll diameter calculator, a speed signal from the strip running speed detector, and a signal from the air entrainment amount setter; The winding device is characterized in that the pressure reference value calculated by the setting pressure calculation unit is corrected by a winding diameter deviation value from the setting winding diameter calculation unit and the winding diameter calculation unit. Machine press roll control device.