JPS597650A - Winding tightness control device - Google Patents

Abstract

PURPOSE:To make winding tightness in a take-up roll alterable according to a constant value or a take-up diameter, by installing a pressure control element controlling a pressure variable via a pressure driving part according to the output of an arithmetic unit for the pressure variable of a pressure roll. CONSTITUTION:A load detector 31 fitted with a BRG of a drum roll B14 detects a horizontal force component Fx in a drum B. Likewise, a pressure variable arithmetic unit 32 inputs the setting value of a nip pressure F in a take-up roll 16 and drum rolls A and B, fixed value constants r, m, and W1, a signal (d) of a take-up roll radius detector 33 interlocking with a pressure roll position and the drum roll horizontal force component Fx, and outputs the signal of a pressure variable DELTAW2 in a pressure roll upon calculation. Next, a pressure control element 23 receives this pressure variable W2 signal, operating a pressure driving part 24 and altering the nip pressure F. The nip pressure F is made to feed back by the load detector 31 and if an error is found there, again the pressure variable DELTAW2 is altered for correction, thus the take-up roll is controlled up to being wound up from the outset.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Description of the Technical Field The present invention relates to a control device for a winding machine for a strip material such as paper, and particularly to an improvement in a winding stiffness control device in a surface winding method.

(b) Description of the Prior Art In general, a surface winding method is often used in winding machines, and this is because the winding roll can be easily carried out. However, on the other hand, it has the disadvantage that it is difficult to adjust the winding tightness of the take-up roll. FIG. 1 shows the winding system of a winding machine used in the conventional backing paper industry. Paper 12 is rewound from an unwinding section 11, and a drum roll A
The winding core 15 (twice wound and thickened) becomes a winding roll 16 by the drum roll B14.

At the beginning of winding, there is only the winding core 15 on the drum roll A13 and the drum roll 14, and the weight of the winding core is light, and if this continues, the rotational torque from the drum roll will not be transmitted to the surface of the winding core and it will idle. .

For this reason, the winding core 15 is pressurized by the pressure roll 17+2 and is rotated around a drum roll. 18 is a tension detector, 19 is an eye power setting device, 2° is a tension control unit, 2
1 is a braking device in the unwinding section, and the hardness of paper winding is determined by the tension of the paper being wound and the amount of pressure applied. In other words, if the paper being wound has the appropriate tension and there is little air between the rolled sheets, it will be tightly wound.

This amount of pressure applies to three surfaces in total: the contact part between the pressure roll 17 and the take-up roll 16, the take-up roll 16, the drum roll A13, and the drum roll B14. This takes into consideration the effect at the beginning of winding, and applies constant pressure. Sub D (1) - paper density, /-
According to the relational expression (in paper, D = take-up roll diameter), as the diameter increases, it increases to the 4th power, so the winding stiffness of the take-up roll becomes tighter as the roll becomes thicker. become. Note that 22 is a pressure amount setting device for the pressure roll 17;
3 is a pressure control section, and 24 is a pressure drive section.

(C) Object of the Invention The present invention has been made in view of the above reasons, and provides a winding hardness control device that does not have the above-mentioned drawbacks and can change the winding hardness of a winding roll to a constant value or according to the winding diameter. The purpose is to provide

(d) Structure and operation of the invention The present invention will be explained below. For the convenience of understanding the present invention, the nip pressure F between the take-up roll and drum rolls A13 and R14, which is the main factor in the hardness of winding and winding, will be explained below. The gauze is explained based on Figure 2. In the figure, drum roll A13.
The diameter of 814 is r [m]...Fixed value winding roll 1
6 diameter is 2dn]...Fixed value The center distance of drum rolls A and II is 2m [m]...Fixed value The weight of the pressure roll 17 is w, [lQ)...・・・
...The amount of pressure applied by the fixed value pressure roll 17 is Wt [~]
・Song/variable value The weight of the take-up roll 16 is W, ~]
... Variation value The angle between the center 0 of the take-up roll 16 and the drum roll contact point "+" in the vertical direction is θ
・The nip pressure is F (?), the force applied in the horizontal direction of the drum roll is Fx [4], and the force applied in the vertical direction of the 7 drum rolls is Fy! M)/unit, and each force due to the pressure roll and take-up roll is expressed as follows.

2xFy=w, +w, +w, −-1,0
,,, (1) F cos θ = 2X Fy = W, +
W, +wo-・-・-・= (2) F sinθ=2
× Eight songs/songs (to 3 From equations (3) and (4), F = East ■ x Fx x 2 ・・・・・・・・・
- Obtain (5). Since r, W, and m are fixed values, the nip pressure F can be calculated from equation (5) by detecting the take-up roll radius d and the horizontal component force Fx.

Also, from equations (2) and (4), W, = FcδSθ - kite - W0 Therefore, when considering the stability of control: As shown in equation (6), as an open loop, the nip pressure F is Detecting the roll radius d I: Approximate pressure roll pressure amount W!
It is preferable to calculate and perform the above correction control in the outer loop 62. In the control using only equation (6), as shown in equation (7), 1:density p (Kf/-i'') is determined each time,
The nip pressure F cannot be controlled with high precision.

Figure 3 shows an example in which the present invention is applied to a winding machine used in the paper manufacturing industry.For convenience, the unwinding section is omitted here as it is the same as Figure 1. .In the same figure (-, 31 is Bl' of drum roll B14
[) is the installed load detector, and this detector 31 is
It has a structure that detects the horizontal component force FX of the drum roll B. 32 is a pressurization amount calculation device, and the winding roll 16
and the set amount of nip pressure F of drum rolls A and B, and fixed value constants r and m.

The W weight, the signal d of the take-up roll radius detector 33 linked to the pressure roll position, and the drum roll horizontal component force Fx are input and calculated, and the pressure roll pressurization amount ΔW is output.

The pressurization control unit 23 controls this pressurization amount △W! Upon receiving the signal, the pressure driving section 24 is operated to change the nip pressure F. The nip pressure F is fed back from the detector 311, and if an error occurs, the pressurization amount ΔW is changed again. By this operation, the winding roll is controlled from the winding start position to the winding thickening and winding end position.

FIG. 4 shows a detailed circuit of the pressurization amount control device 32, with radius d
The value of is added to the drum roll radius in adder 41, and d+
get r. Further, the value of m is obtained by the multiplier 42, and the output d+r of the adder 41 is obtained by the multiplier 43 (d+r), and together with the above-mentioned -, the subtracter 44 obtains (d+r)-m'. 45, F147:7" is obtained. This signal is further sent to the divider 4 together with the output (d+.) of the adder 41.
6 (from 2, 777--) is obtained. In other words, the output of the divider 46 calculates and outputs cos θ. This COS θ is multiplied by the nip pressure setting value F by the multiplier 47. , F cos θ is obtained.

On the other hand, the d signal is obtained (2d)' by a 4-power multiplier 48, and multiplied by a constant K (K=πpe) in a multiplier 49.
Paper roll weight W. get. This signal is the F'cosθ
-W, , Wa are input to the subtracter 50. As a result, the subtracter 50 outputs the pressurization amount W. Furthermore, (d+r), which is the output of the adder 41, the m signal is sent to the divider 51d.
+r yo! 'rn' means good luck, signal F of load detector 31
The multiplications of X and the multiplier 52 are combined to obtain F=Fx×i.

This output is the actual value of the nip pressure F, and is compared with the nip pressure setting value F set in a setting device (not shown) by the comparator 53, and the deviation output is the value of the open loop pressurization value W. The value is added together with the adder 54 to obtain the final pressure roll pressure amount ΔW! Output. Based on this output signal, the pressure control section 23 and the pressure drive section 24 operate to control the nip pressure F.
is properly controlled.

In the above embodiment, the arithmetic unit is constructed of hard logic, but it goes without saying that it can be handled by software processing of a recent microcomputer or the like. or,
Although the nip pressure F is set at a constant value, it is easy to adapt it to the actual application (1), such as by setting the taper in proportion to the winding diameter (2).

(e) General explanation In this way, according to the present invention, operations that were conventionally performed by operators based on their experience and intuition are automated, eliminating variations in the rolling hardness of products, and reducing the burden on operators. At the same time, it is possible to provide an effective winding tightness control device that can be easily added to or modified from existing equipment.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the winding stiffness control of a conventional winding machine, Fig. 2 is an explanatory diagram of the main factors of winding stiffness of the present invention, and Fig. 3 is a winding machine showing an embodiment of the present invention. An explanatory diagram of the winding stiffness control device,
FIG. 4 is a detailed diagram of the pressurization amount control device of the present invention. 11... Rewinding section 12-10 paper 13... Drum roll A 14... Drum roll B15...
Winding core 16... Winding roll 17... Pressure roll 18... Tension detector 19... Tension setting device 20... Tension control unit 21... Braking device 22... Pressure amount setter 23...pressure control section 24...pressure drive section 31...load detector
32... Pressure amount calculating device 33... Winding roll radius detector 41.54... Adder 42.43, 47, 49
．． 52...Multiplier 44.50...Subtractor 45
... Square rooter 46.51 ... Divider 48...
・Accumulator 53...Comparator (7317) Agent Patent attorney Nori Chika (right)
(1 other person) Figure 1 Figure 2 Figure 3 r l Wt W2

Claims (1)

[Claims] In a winding stiffness control device for a surface winding method of a winding machine that winds a strip material, the drum roll shaft includes: a detector for detecting the applied load, a detector for detecting the winding diameter, and the above-mentioned Ryokawa force. a pressure amount calculation device that calculates the nip pressure between the take-up roll and the drum roll by inputting the same value, compares it with the same set nip pressure value, and outputs a pressure amount signal of the pressure roll, and this pressure amount calculation device. A winding tightness control device comprising: a pressure control section which inputs an output and controls the amount of pressure applied to the pressure roll of the winding machine via a pressure drive section.