JPH0428651A - Taking up method and taking up control device for take-up of paper machine - Google Patents

Abstract

PURPOSE:To enhance work efficiency and yield in processing paper by providing an actuator to tilt a winding arm and a control unit to detect the winding size of paper wound on a take up shaft and adjust the output of the actuator in accordance with a detected value. CONSTITUTION:A winding arm 4 to tiltingly support a take up shaft 3 and an actuator 5 to tilt the winding arm 4 are provided. A sensor 11 detects the winding size of paper 1 wound on the take up shaft 3 and a control unit 17 adjusts the output of the actuator 5 in accordance with a detected value. By the adjustment, contact pressure on a rotating drum 2 for the paper 1 on the take up shaft 3 is increased with the increase of the winding size.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a winding method and a winding control device in a winder of a paper machine.

Paper that has been made through the plow section, press section, and drying section of a paper machine is normally wound up on a winding machine, and then sent to secondary processes such as super finishing, cutting, and rewinding. The present invention relates to a winding method for winding paper before it is sent to a secondary process, that is, a winding machine installed in the finishing section of a paper machine, and a control device for the winding method.

[Prior art] Traditionally, winding machines include a meticulous type reel that winds paper by rotating a winding shaft, and a surface type reel that winds paper by bringing it into contact with the surface of a rotating drum. There is a reel (also called a bove reel).

A conventional example of this bove type reel will be explained based on FIG.

1 is paper made by a paper machine, 2 is a rotating drum, 3 is a winding shaft, 4 is a winding arm, and 5 is a pneumatic cylinder. The winding arm 4 is tiltably supported, and is supported by a pneumatic cylinder 5.
As a result, the paper 1 on the take-up shaft 3 is brought into contact with the rotating drum 2.

The paper 1 is wound around the winding shaft 3 due to frictional transmission caused by this contact. As the winding diameter of the paper 1 increases, the winding arm 4 tilts from the state shown by the solid line to the state shown by the chain line. During this time, the air in the rod-side compartment 5a of the pneumatic cylinder 5 is appropriately discharged, and air is supplied to the piston-side compartment 5b, so that the contact pressure against the rotating drum 2 is kept substantially constant. ing.

[Problem to be solved by the invention] However, in the conventional winding machine, since the contact pressure is constant,
There were the following problems.

First, due to the elasticity of the white paper, an appropriate winding hardness can be obtained when the winding diameter is small, but as the winding diameter increases, there is a tendency that sufficient winding hardness cannot be obtained. Ta. For this reason, the contact pressure is usually set high from the beginning so that appropriate winding hardness can be obtained even if the winding diameter becomes large.

However, this causes the winding hardness to become too tight in the area where the winding diameter is small, resulting in the problem that the resin and other impurities in the pulp material (hereinafter referred to as pitch) strongly adhere to the paper wound on the front and back sides. was occurring.

If this pitch disorder occurs, the paper will be pulled together with the paper attached to the back or front side during the super finishing, cutting, rewinding, etc. processes after winding, causing paper breaks. There was a strong demand for its resolution.

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to provide a winding method that does not cause the pitch disturbance described above.

Another object of the present invention is to provide a winding control device that appropriately implements the winding method described above.

[Means for Solving the Problems] The winding method of the present invention is a method of winding paper to be wound around a winding shaft by bringing it into contact with the surface of a rotating drum, that is, a method using a pove-type reel. It is characterized in that the contact pressure of the paper on the take-up shaft against the rotating drum is increased in accordance with the increase in the take-up diameter.

In the present invention, the increase in contact pressure includes both linear and non-linear relationships with the winding diameter. It also includes those that increase linearly and those that increase continuously.

The winding control device of the present invention is a device for realizing the winding method described above, and includes a winding arm that tiltably supports a winding shaft, an actuator that tilts the winding arm, and the winding shaft. The present invention is characterized by comprising a control unit that detects the winding diameter of the paper wound on the paper and adjusts the output of the actuator based on the detected value.

In the winding control device of the present invention, the winding diameter may be detected directly by contact or non-contact, or may be detected indirectly from the tilt angle of the winding arm. Further, the actuator for tilting the take-up arm may be a linear motion actuator such as a pneumatic cylinder or a hydraulic cylinder, or a rotary motion actuator such as a swing motor.

[Function] According to the winding method of the present invention, winding is performed with a lower contact pressure while the winding diameter is small, and as the winding diameter increases, winding is performed with a higher contact pressure. Therefore, it is possible to wind with appropriate winding stiffness even in a region with a small winding diameter without causing loosening in the region with a large winding diameter. For this reason, there is no room for pitch disturbances to occur in areas where the winding diameter is small, which has conventionally occurred, and paper breaks are less likely to occur in the secondary process.

Further, according to the control device of the present invention, since the output of the actuator is adjusted based on the detected value of the winding diameter, the contact pressure can be adjusted thereby. Since this adjustment is automatically performed by the control unit, the contact pressure can be controlled accurately.

[Example] Next, embodiments of the present invention will be described based on the drawings.

FIG. 1 is a schematic diagram of a winding control device according to an embodiment of the present invention.

1 is paper made by a paper machine, and only the portion that passes through the plow section, press section, and drying section of a known paper machine and is supplied to a winding machine is shown. Although the paper 1 itself may be made from virgin pulp, paper made from waste paper pulp is more likely to cause pitch failure, and therefore the application of the present invention has greater advantages.

2 is a rotating drum, usually a cylinder made of cast iron. Then, it is connected to an appropriate prime mover and rotated in the direction of arrow a.

3 is a winding shaft, which is usually made of steel pipe. And paper 1
The terminals are fixed to the winding shaft 3 with tape or the like, and the windings are sequentially wound.

Reference numeral 4 denotes a winding arm, the upper end of which is formed into a fork shape and supports the winding shaft 3. Further, its base end is rotatably supported by a bracket 7 on the floor with a pin 6.

5 is a pneumatic cylinder, a piston rod 8 is connected with a pin to the winding arm 4, and a cylinder 9 is connected with a pin to a bracket 10 on the floor.

This pneumatic cylinder 5 presses the paper 1 on the winding shaft 3 against the rotating drum to obtain an appropriate contact pressure P.

With the above mechanical configuration, the paper 1 wound around the winding shaft 3 is brought into contact with the rotating drum 2, and the paper 1 is sequentially wound around the winding shaft 3 due to frictional transmission at the time of contact. It looks like this. As the winding progresses, the winding shaft 3 moves away from the position close to the rotating drum 2, and this movement is guided by a guide rail (not shown).

Next, the control unit will be explained.

Reference numeral 11 denotes a sensor for detecting the tilt angle θ of the winding arm 4, and is constructed by attaching a known potentiometer or the like to the pin 6. Note that it goes without saying that the tilting angle θ may be detected by means other than this. This tilt angle θ
varies according to changes in the winding diameter on the winding shaft 3, so
The detected value is a variable representing the winding diameter. The detected value θ is then input to the controller 17. Details of this controller 17 will be described later.

On the other hand, an air supply line 12 is connected to the rod side compartment 5a of the pneumatic cylinder 5, and an air supply line 13 is connected to the piston side compartment 5b, and each supply line 12.13 has two positions in four directions. Air is supplied and discharged through a type solenoid valve 14.

Further, the air supply line 12 is provided with an electropneumatic converter 15 and a pressure reducing valve 16. The electro-pneumatic converter 15 changes the air pressure on the output side according to the electric signal from the controller 17. For example, if the input pressure is 5 kgf/cd, the air pressure is 0. A device that can change the output pressure within a range of 1 to 5 Kgf/cd is used.

The pressure reducing valve 16 is provided to set the upper limit of the secondary pressure of the supply line 12.

A known programmable controller or the like is preferably used as the controller 17, and FIG. 2 shows an example of a controller using a microcomputer. This controller 17 includes a ROM that stores an appropriate contact pressure P corresponding to the winding diameter, and a memory card that is necessary for executing calculations.
P.U.

It is equipped with RAM, etc. Then, when the detected value θ of the sensor 11 is taken in from the input port, the required calculation is executed and an electric signal E is output from the output port. Then, the electro-pneumatic converter 15 adjusts the air pressure to a pressure corresponding to the electric signal E, and supplies air to the rod-side compartment 5a of the pneumatic cylinder 50.

As described above, by adjusting the pressure of the blower supplied to the rod side compartment 5a, the winding shaft and
The contact pressure that presses the paper 1 on the drum 3 onto the rotating drum 2 can be adjusted.

Next, the details of contact pressure control will be explained.

The control method of the present invention is characterized in that the contact pressure P is substantially increased in accordance with the withstand size of the winding diameter, and various types of butter 2 can be considered to increase the contact pressure P. There are various types of paper that can be selected as appropriate depending on the type of paper 1 and the initial and final values of the winding diameter.

Typical patterns are illustrated below.

In the example shown in FIG. 3, at the initial gradient 10 of the winding diameter, the contact pressure remains constant at the initial pressure IP, and in the intermediate region MD
, the pressure increases linearly, and the late region FDY again remains constant at the final pressure FD.

That is, in this example, the bending points of the output pressure P are set in two force orders.

The example shown in FIG. 4 eliminates the bending point in FIG. 3 and changes continuously.

In the example shown in FIG. 5, the winding increases linearly from the beginning to the end.

In the example shown in FIG. 6, the initial pressure IP changes only in the initial region ID of winding, and thereafter increases linearly until the final winding.

In the example shown in FIG. 7, the initial winding region ID and intermediate region MD increase linearly, and the final pressure FP changes in the late region FD.

In addition, on each of the above sides, the portion that changes linearly may be increased non-linearly so as to draw a curve, and further
The bending points in FIG. 7 may be changed continuously.

As described above, according to this embodiment, the contact pressure P at the initial stage of winding
Since there is no need to make the winding temperature abnormally high, the winding hardness in the early stage of winding falls to an appropriate value, and as a result, it is effective to prevent pitch disturbances where impurities such as pitch are strongly stuck between the wound sheets. can be prevented. Further, in secondary processing, paper breaks are less likely to occur when the wound paper l is re-wound, and the yield of paper processing can be increased.

[Effects of the Invention] According to the present invention, pitch failure does not occur during winding, and paper breakage does not occur during secondary processing after winding, so the work efficiency and yield of paper processing can be improved.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a winding control device according to an embodiment of the present invention, and FIG. 2 is a block diagram showing an example of a controller.
Figures 3 to 7 all show the control details of the present invention.
The contact pressure related diagram, FIG. 8, is a schematic diagram of a conventional winding machine. (Main symbols in the drawing) 1: Paper 2: Rotating drum 3: Winding shaft 4: Winding arm 12. 5: Pneumatic cylinder 11: Sensor 13: Air supply circuit 15: Electro-pneumatic converter 17: Controller 1: Paper 4: Winding arm diagram Electro-pneumatic converter I 5 Controller diagram D D D diagram

Claims (1)

[Scope of Claims] 1. A method for winding paper to be wound on a winding shaft by bringing it into contact with the surface of a rotating drum, the method comprising increasing the contact pressure of the paper on the winding shaft against the rotating drum to increase the winding diameter. A winding method in a winding machine of a paper machine, characterized in that the winding is increased according to the winding speed. 2. A device for winding paper to be wound on a winding shaft by contacting the surface of a rotating drum, comprising: a winding arm that tiltably supports the winding shaft; an actuator that tilts the winding arm; and a winding arm that tilts the winding arm; Winding in a winding machine of a paper machine, comprising: a control unit that detects a winding diameter of paper wound around a winding shaft and adjusts the output of the actuator based on the detected value. Control device. 3. The winding control device according to claim 2, wherein the winding diameter is indirectly detected from the tilt angle of the winding arm. 4. The winding control device according to claim 2, wherein the actuator is a pneumatic cylinder.