KR810001346B1 - Winding tension control method - Google Patents

Abstract

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Description

Winding tension control method

1 is a graph showing the winding tension when the method of the present invention is used.

2 is a schematic layout showing the manner of practicing the invention.

3 is a basic control system diagram of the present invention.

4 and 5 are another modified control system diagram.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling the winding tension when winding a sheet, and more particularly to a control method for winding a sheet while ideally reducing tension.

It is well known that the winding tension coefficient is the biggest factor that determines the quality of sheets when the sheets of paper, plastic film, cloth, etc. are wound by the central driving method.

Known as general empirical knowledge, there are various methods of winding the sheet while winding the sheet while ideally reducing the tension. Such a method is commonly referred to as taper tension. Ideally, the tension is reduced when the sheet is wound, depending on the material of the sheet, its size, and operating conditions.

The applicant obtained arbitrary tension characteristics with respect to the growth of the winding in Japanese Patent Application No. 47-71419 using the winding diameter as the growth condition of the winding. By applying this method specifically to the winding device, the applicant can adjust the winding tension at will, and as a result of various operations, the results have been great.

Applicants studied the principles of winding work and came to focus on the following facts. In other words, when the sheet is rolled into a rolled product, the exception is that the product is made by the length of the sheet wound up to near 100%. Therefore, the winding diameter is determined secondarily.

Specifically, the winding device is configured to automatically stop when the desired winding length is reached or to be automatically replaced by another winding shaft.

As a result of review and analysis of this point, as a means of detecting the growth conditions of the winding and automatically controlling tension characteristics for the conditions, it was found that the winding length should be based on the length of the winding. It became.

It is an object of the present invention to provide a method in which both the inner and outer layers to be wound are wound around a constant winding density by gradually decreasing the tension by a constant relation according to the winding length.

And it provides a way to automatically control the winding tension while detecting the length to be wound.

The features of the present invention will be described with reference to the drawings.

FIG. 1 shows the control curve of the winding tension in the method of the present invention, showing the state of reducing the tension from the radius Rmin at the start of winding to the radius Rmax at the end of the winding.

The basis of the present invention is that everything is expressed in the characteristics shown in FIG. In other words, this characteristic is in any case represented by the following equation:

T = To {1-α (x) θ}

Where T is the winding tension under the condition of winding growth, To is the tension setpoint at the start of winding (called tension levenl), α is the coefficient representing the rate of change of tension, and X is the winding length of the set winding roll. The ratio of the roll size, θ, is a coefficient representing the change characteristic of the tension.

As apparent from Fig. 1, the relationship between θ and x means a linear change in tension when, for example, θ = 1 is specified, where α is a linear change rate, and a taper rate. The characteristic when θ> 1 is the ball characteristic curve characteristic.

The characteristic when (theta) <1 becomes a concave curve characteristic.

In the case of specifying θ = -1, hyperbolic characteristics are obtained.

The characteristics of the present invention are divided into the steps of setting the set tension from the size of the winding roll, and detecting or calculating the winding tension.

In the step of setting the set tension from the size of the winding roll, the above-described theoretical equation is applied and developed. In other words

T = To {1-α (x) θ}

In the above, the term (X) is specifically a size based on the winding length, and there are four cases as follows.

2 shows an arrangement for explaining the control method of the present invention.

In this figure, the thickness of the sheet | seat 1 is measured with the thickness detector 2 as needed. The method using A line is used for this thickness detector 2 a lot. Pass through the guide roll (3) to the tension detector (4), and again through the guide roll (5) and touch roll (touch roll) (6) to the winding roll (7).

As the tension detection method, a means for converting the amount of displacement of the roll generated by the force of tension into an electrical signal by a differential transformer or a strain gauge is generally used.

As the detector 8 for detecting the winding length during winding, a pulse generator for generating pulses per unit length in accordance with the progress of the sheet is generally used.

의 계산을 하므로써 권취직경이 얻어진다.As the winding diameter detector 9, for example, in the case of the winding system using the touch roll 6 as shown in FIG. 2, the winding diameter can be easily obtained by detecting the displacement angle of the touch roll 6. . In the case of not using the touch roll, two elements of the rotational speed (n) and the moving speed (s) of the winding roller are detected.

The winding diameter is obtained by calculating.

Although the specific structure of the winding core 13 of the winding roll 7 installed on the winding device 10 is omitted, the automatic control method which forms the basis of the present invention called the torque actuator 11 as a mechanical driving method is employed. It is transmitted from the device capable of changing the drive torque to the core 13 through the torque detector 12.

As a driving method corresponding to the torque actuator 11, the motor and the clutch are combined to control the transmission torque of the clutch, or the DC motor and the torque motor are directly controlled. In the torque detector 12 connected as necessary, the torsion bar of the torsion bar can be obtained as a phase difference signal or as a strain gauge signal.

The sheet width changing control unit 14 is a device for changing the position of the winding device 10 or moving a slit blade not shown in the drawing when the sheet width to be wound is changed.

An example of the control communication combining the setting tension from the size of the winding roll, which is one of the features of the present invention, and the step of detecting or calculating the winding tension, which is another step, will be described.

FIG. 3 is a structure which detects a sheet | seat and sheet | seat tension in the middle of conveyance, and compares and controls the numerical value and the set tension value, and can be understood very clearly by this systematic diagram.

In addition, a description will be given on-line the tension control system of one winding condition which is a feature of the present invention. The part indicated by the dotted line in the figure means that, for example, one of the winding length setting units is a signal that automatically stops the machine when the winding length reaches the target length or converts it to another new winding side. Is generated, and the signal amount means L amount when the tension control method is changed. Therefore, by linking this signal to the tension control system, there is a great advantage that the tension characteristics of the roll product automatically standardized by the winding length are determined.

Next, for example, in the case where the surface area or volume is the growth condition for winding, a coefficient corresponding to the change of the sheet width must be given to the tension setting unit 16, and the mechanical automatic operation of the winding apparatus for changing the sheet width is performed. In the case of having a control mechanism, the signal and the signal sent to the tension setting unit 16 are interlocked, so that a great advantage of bringing workability as described in the preceding paragraph can be obtained.

The thickness detection is performed while the sheet is in progress, and when the cross-sectional area or volume is taken as the growth condition of winding, the same operation as the coefficient setting signal sent to the tension setting unit 16 is performed as described above.

을 하고, 그 계산치와 장력설정치를 비교 제어하면서 권취장력을 제어하려고 한 것이다.As another embodiment of the present invention, Figure 4 is a tension calculation unit 19 is provided between the torque detection unit 12 and the comparison control unit 17, the magnitude of the torque (τ) of the central driving force supplied to drive the winding and the winding value Calculation that calculates tension while measuring the radius (or diameter) R of each increase in growth

And the winding tension is controlled while comparing the calculated value and the tension set value.

Implementing on-line control indicated by a dotted line is the same as described in FIG.

As another embodiment of the present invention, FIG. 5 shows that the torque calculation unit 20 is provided between the comparison control unit 17 and the amplification unit 18, and is set while using only the winding length signal obtained from the winding length detection unit 15. FIG. A tension value satisfying the tension characteristic is calculated, the torque setting signal is calculated by multiplying the winding diameter measured separately from the tension value, and the torque actuator is operated by the torque setting signal. If necessary, the feedback of the torque detection value can be related to improve the accuracy (two dashed line). And the online control shown by the dotted line is the same as described in FIG.

In practicing the present invention, the theory of the present invention can be easily understood as described above. In the explanation, however, the sheet winding tension itself has been theoretically dealt with. However, in practical application of the sheet winding tension itself, it is better to make corrections for mechanical loss or inertia force limited by the design conditions of the apparatus as necessary.

The present invention can be generally applied to the conditions for winding all kinds of sheets, such as paper sheets and plastic films, and is, for example, a winding machine, a laminator, a coating machine or a printing machine that operates directly in connection with a sheet manufacturing machine. It is applied to a winder, slitter rewinder, or the like connected to a winder.

As a specific means for configuring the control device, an analog control technology digital control technology is typically good.

Claims (1)

The winding tension of the sheet is detected during sheet winding, and as the winding progresses, the set tension according to the size of the winding roll according to the growth of the winding length is calculated using the equation [T = To {1-α (x) θ}, where T is the winding tension under any winding growth condition, To is the tension setting value at the start of winding, X is the ratio of the roll size during winding to the tension-set winding roll size, α: coefficient representing the rate of change of tension, θ: coefficient representing the change characteristic of tension], and controlling the winding tension by the comparison value between the detected winding tension value and the calculated set tension value. Winding tension control method characterized in that it is combined with.

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