JPS62215089A - Apparatus for controlling thickness of foil member - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a thickness control device for a foil-like member in a paper machine or the like, and in particular, the present invention relates to a device for controlling the thickness of a foil-like member in a paper machine, etc. Thickness).

[Conventional technology]

FIG. 5 is a configuration diagram showing a conventional thickness control device for a foil member disclosed in, for example, Japanese Unexamined Patent Publication No. 58-87B91.
In the figure, (1) and (2) are the rotating metal first.
The second rotating roll (hereinafter referred to as the 10th rule and the 20th rule), (3) is a plurality of heating coils arranged in the axial direction along the surface of the 10th rule (1), ( 4) is a high frequency power supply device that supplies high frequency power to the heating coil in one-to-one correspondence with the heating coil (3); (5) is a timer that determines the operating period of the high frequency power supply device (4); (7) are the 1st and 20th rules (1).

(2) by rotation of the first and second rolls (1).

(2) A foil-like member such as paper that passes through the gap.

Next, the operation will be explained. When high-frequency power is supplied to the heating coils (3) by the high-frequency power supply (4), the surface of the 10th rule (1) near each heating coil is heated by rust conduction, and the temperature increases. The surface of the tenth rule (1) expands and the diameter of the tenth rule (1) increases. Therefore, if the relative positions of the axes of the 10th rule (1) and the 20th rule (2) are fixed, then the 10th rule (1) and the 20th rule
(2) gap is reduced. At this time, if a foil-like member such as paper (7) is passing between the 10th rule (1) and the 20th rule (2), the 10th rule (1) and the 20th rule (2) ) can reduce the thickness of this paper (7).

Generally, in the paper manufacturing process, it is required to make the thickness of paper as uniform as possible. Therefore, as shown in Fig. 5, a plurality of heating coils (3) are arranged along the axial direction of the 10th rule (1), and
), and by operating the high frequency power supply device (4) of the heating coil (3) corresponding to the area where one part of the paper is thicker than the other parts, the paper is Paper thickness can be reduced. In addition, in order to reduce the paper thickness by adjusting the degree to which the paper thickness is reduced, it is sufficient to adjust the degree to which the diameter of the 10th rule (1) is increased, that is, the degree to which the surface of the 10th rule (1) is expanded. - The degree of expansion of the surface of the heating coil (3) is greater than that of the heating coil (3).
), which can be considered to be approximately proportional to the amount of power input to the heating coil (3).
3), that is, the response of roll expansion to changes in the output of the high frequency power supply (4) is considerably delayed. Therefore, the amount of power input to the heating coil (3) may be increased or decreased within a certain period of time without continuously changing the output of the high frequency power supply (4). The amount of power input to the heating coil (3) is the average value of the power input to the heating coil (3) within a certain period of time multiplied by that time, and the average value of the input power depends on the operation of the high-frequency power supply device. This can be adjusted by changing the period.

Here, the power input to the heating coil (3), that is, the average output P# of the high frequency power supply device (4) is given by the following formula.

T (G): Operating period of the output of the high frequency power supply device, T snoring: Stop period of the output of the high frequency power supply device, PO: Output of the high frequency power supply device, Timer (5) Therefore, by setting the above TON and TIF, , mf the above PMI! ! 'i, and finally the paper thickness (capacity) can be changed.

[Problem that the invention seeks to solve]

Conventional foil-like member thickness control devices are configured as described above, so that, for example, when controlling paper thickness, the operating period of the high-frequency power supply device of the heating coil corresponding to the paper thickness is adjusted accordingly. There was a problem in that the number of heating coils and the stop period had to be set individually using a timer, and if the control points for one paper thickness were to be finely controlled, the number of heating coils would increase and the setting of the timer would become complicated.

This invention was made to solve the above-mentioned problems, and even when there are a large number of heating coils, it is possible to easily set the operating period and stop period of the high-frequency power supply, and it is also possible to An object of the present invention is to obtain a thickness control device for a foil-like member that makes it easy to visually compare the electric power generated.

[Means for solving problems]

The thickness control device for a foil-like member according to the present invention measures the thickness of the member along the axial direction of the roll for pressurizing the member, obtains each measurement data, and also positions the thickness of the member in accordance with the fixed position of each data J11. The ratio of the time when the roll heating coil is energized is
This ratio is calculated in comparison with a predetermined energization period, and based on the ratio, the operation period and the operation stop period of the power supply device that supplies power to the heating coil are controlled.

[Effect]

The foil-like member thickness control device in this invention
The average heating power for the heating coil that heats and expands the raw diameter of the member pressure roll is calculated and set from the ratio of the power energization time and the preset energization time period in accordance with the change in the current energization time period. Turn the heating coil power supply on and off based on the determined energization time and energization stop time.
By controlling FFrf II, the heating coil applies the optimum amount of heat to the roll according to the thickness change of the material, expands the roll diameter, and the gap between the rolls is sandwiched to cancel the thickness change of the material and make the material thickness uniform. It is something to do.

〔Example〕

FIG. 1 is an overall configuration diagram of an embodiment of a foil-like member thickness control device according to the present invention. As is clear from FIG. 1, in this embodiment, a paper thickness measuring device 2 (thickness measuring device) (8) measures the thickness of a foil member (7) along the roll axis direction.
), and a duty ratio calculation means (II) for calculating, from the thickness measurement data, the ratio of the energization time in the energization time period to the heating coil located corresponding to the data measurement position.
al), energization operation setting means (lla2) for setting the energization time and energization stop time based on the duty ratio, and controlling the on/off operation period of the high frequency power supply device (4) based on the energization time and the energization stop time. Programmable sequencer (
1O), J: A display device (Ilb) that displays the thickness measurement data of the foil-like member and the ratio of the energization period to the energization time for each heating coil.

Figure 2 is a system configuration diagram of the foil-like member thickness control device used in the embodiment shown in Figure 51;
is a paper thickness measuring device (thickness measuring device) that measures the thickness of paper passing between the 10th rule (1) and the 20th rule (2),
(10) is a programmable sequencer (hereinafter referred to as sequencer), (11) is a computer,
The computer (II) constitutes each of the above means (:
PIJ (lla), CRT display (llb),
It consists of a keyboard (llc).

(1) to (4) and (7) are the same as the conventional device.

Next, the operation of this embodiment will be explained based on FIG. 1st
．． The operations of the 20th loop (+), (2), heating coil (3), and high frequency power supply (4) are the same as in the conventional device.

As shown in FIG. 4(A), first the keyboard (llc)
Accordingly, the operating period Ts (the sum of the operating period TON and the stop period T) of the high-frequency power supply device (4) and the high-frequency power supply device (4)
Input the ratio of the operating period of , that is, the duty ratio 0R (ratio of ToN to Ts). The CPU (lla) calculates the operating period TON using the following equation.

TON=T5X Duty ratio DR Then, the operating period TON and Ts are commanded to the sequencer (the same), and as shown in FIG. 4(B), the high frequency power supply system f!
The operation/stop of 1 (4) is controlled by the sequencer (10). (The stop LE period is Ts - TON.) Here, the above duty ratio OR is as described in the above equation (A). Since it is the ratio of TOH to the sum of TON and TIIF, the heating coil (
3) is nothing but the degree of power input. On the other hand, unless the operating period Ts becomes a very large value, it does not affect the average output value of the high-frequency power supply, so it can be set to a fixed value. By inputting and setting the ratio, the magnitude of the power applied to each heating coil can be adjusted, and the paper thickness at the location corresponding to each heating coil can be adjusted. This adjustment is performed using a paper thickness measuring device that continuously measures the thickness of the paper (7) passing between the 10th rule (1) and the 20th rule (2) along the axial direction of the roll. This will be done while looking at the data in (6). As shown in Figure 3, the operator's operations can be made easier by displaying paper thickness data and duty ratio settings for each coil on the CRT display (llb). .

In other words, if the paper thickness in a certain area is increased compared to other areas, by increasing the duty ratio at that area, the power input to the heating coil (3) increases, and the 10th - The diameter of the rule (1) can be increased to reduce the paper thickness. Note that the duty ratio input from the keyboard (llc) and the CRT display (llb
) It goes without saying that it is easier to use the duty ratio (named power) displayed in percentage units.

In order to control the paper thickness, there is a method of changing the magnitude of the power applied to the heating coil (3) continuously or in several steps, but this method requires complicated control of the high frequency power supply device (4) and requires a sequencer. It becomes impossible to issue commands to the high-frequency power supply device in two states, operating/stopping, and this may result in a complicated command method.

In addition, although the method for controlling the paper thickness was explained in the above embodiment, as long as it is a foil-like member that can be passed between the 10th rule (1) and the 20th rule (2), the above embodiment can be applied. The thickness of the foil member can be controlled.

〔Effect of the invention〕

As described above, according to the present invention, by setting the degree of power input to the heating coil in the form of a duty ratio, the power can be easily adjusted, and the paper thickness and duty ratio can be adjusted to match the CRT display. By displaying this, it is possible to visually adjust the paper thickness, which has the effect of making the adjustment easier.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram of an embodiment of a foil-like member thickness control device according to the present invention, FIG. 2 is a control system configuration diagram to which this foil-like member thickness control device is applied, and FIG. 3 is a system diagram. Figure showing an example of the display inside the 4th V! J(A)
, (B) is a control flowchart for each heating coil (3) and an operation chart of the high frequency power supply device (4),
FIG. 5 is an overall configuration diagram showing a conventional thickness control device for a foil-like member. In the figure, (1) is the first rotating roll, (2) is the second rotating roll.
(3) is a heating coil, (4) is a high frequency power supply device, (6) is a thickness measuring device, (7) is a foil member, (llat) is a duty ratio calculation means, (11a2)
) is the energization operation setting means, and (Ilb) is the display device. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Agent Masuo Oiwa Figure 1 Figure 4 (A)

Claims (1)

[Claims] A first rotating roll, a second rotating roll that is paired with the first rotating roll and pressurizes the foil-like member, and are arranged adjacent to each other at a predetermined interval in the axial direction of the first rotating roll. , Thickness control of a foil-like member equipped with a heating coil that locally expands the roll diameter by induction heating the rotating roll surface, and a high-frequency power supply device that is paired with each heating coil and supplies high-frequency power to the coil. The device includes a thickness measuring device that measures the thickness of the foil-like member along the roll axis direction, and a thickness measuring device that measures the thickness of the foil-like member along the roll axis direction, and determines, based on the thickness measurement data, the energization time period for the heating coil located corresponding to the data measurement position. duty ratio calculation means for calculating the ratio of energization time; energization operation setting means for setting energization time and energization stop time based on the duty ratio; and on/off operation period of the high frequency power supply device based on the energization time and energization stop time. a programmable sequencer that controls the thickness of the foil-like member, and a display device that displays the thickness measurement data of the foil-like member and the ratio of the energization period to the energization time for each heating coil. Control device.