JP6725360B2 - Judgment device - Google Patents

Description

The present invention relates to a determination device that determines a traveling state of a roll.

When running a long web, a roll is provided in the middle of the running path, and a driving force is applied to the web by rotating the roll.

JP, 2002-211811, A

When the web is driven by using the roll as described above, it is difficult to determine whether the web is traveling stably on the roll because the contact state of the traveling web and the rotating roll is unknown. There was a problem.

Therefore, in view of the above problems, it is an object of the present invention to provide a determination device that can determine whether or not the web is traveling stably when the web is driven by a roll.

The present invention provides a roll for traveling a web, a motor for rotating the roll, a torque meter arranged between a rotation shaft of the roll and an output shaft of the motor, and a roll torque value measured by the torque meter. The measured friction coefficient μ1 is obtained from N1 and the motor torque value N2 of the motor, and the difference α between the theoretical friction coefficient μ0 stored in advance and the measured friction coefficient μ1 is within the predetermined reference range β, and the torque meter When the output direction measured is stable for a constant duration, the control unit determines that the web is traveling stably, and
When the tension of the web before the roll is T1 and the tension of the web after the roll is T2, the control unit obtains a tension cut value ΔT=|T1-T2| When the smaller value of the tension T2 is the base tension T0, the holding angle of the web on the roll is θ, and the area contact ratio ε of the web in contact with the roll is ε,
(1) The theoretical friction coefficient μ0 is obtained from the tension cut value ΔT, the base tension T0, the area contact rate ε, and the holding angle θ.
μ0=[log _e {ΔT/(T0·ε)+1}]/θ
From
(2) The measured friction coefficient μ1 is obtained from the roll torque value N1 and the motor torque value N2, the roll drive torque value N0, the roll radius R, the base tension T0, and the tension cut value ΔT=| T1-T2| and the included angle θ, and the measured friction coefficient μ1 is
μ1=[log _e {N0/(R·T0)+1}]/θ
However,
When T1<T2, N0=|N1+N2|,
When T1>T2, N0=|N1+(N1-N2)|
Is a determination device.

According to the present invention, it can be determined whether or not the web is traveling stably.

It is a side view of the state where the roll of one embodiment of the present invention is running the web. It is explanatory drawing of the drive device of this embodiment. It is explanatory drawing of the drive device of the example 1 of a change. It is explanatory drawing of the drive device of the example 2 of a change.

Hereinafter, the determination device according to the embodiment of the present invention will be described with reference to FIGS. 1 and 2 when the drive device 10 that rotates the roll 12 is incorporated. As a system in which the driving device 10 for the rolls 12 is installed, for example, a web W such as a long film, a metal foil, a metal mesh, a cloth, or paper is unwound from an unwinding device, and a web is applied by a coating device. A system in which one side or both sides of W are coated with a coating liquid, then conveyed to a drying device to be dried, and finally a web W is taken up by a take-up device. Alternatively, the roll 12 of the present embodiment is provided at two or more places.

(1) Drive device 10
The structure of the drive device 10 for the roll 12 will be described with reference to FIGS. 1 and 2.

First, as shown in FIG. 1, the roll 12 rotates so as to wind the web W, and the web W is running. The types of the roll 12 include a drive roll, a metal roll, a suction roll, and a nip roll (pressing roll). The suction roll is a roll that has a plurality of holes opened on the surface of the roll 12 and runs while sucking the web W. The rotating shafts 14, 14 protruding from the left and right sides of the roll 12 are rotatably supported by a pair of left and right bearings 16, 16.

The drive device 10 includes a torque meter 18, a motor 20, a drive unit 22 of the motor 20, a control unit 24, and a display unit 26.

The motor 20 is an AC vector motor, which is vector-inverter controlled by a drive unit 22 including an inverter circuit and rotates at a predetermined rotation speed. The motor torque value of the motor 20 is obtained by the control unit 24 detecting a drive signal (current value or voltage value) from the drive unit 22 to the motor 20.

The torque meter 18 is provided between the output shaft 28 of the motor 20 and the rotary shaft 14 of the roll 12, detects the distortion due to the rotational moment of the rotary shaft 14 and the output shaft 28, and outputs it as a roll torque value. Further, the torque meter 18 expresses the output direction of the torque corresponding to the direction of the strain as + or-of the roll torque value and outputs it. The output shaft 28 of the motor 20 is a direct drive system in which the output shaft 28 is directly connected to the torque meter 18.

The display unit 26 has an image display device such as a liquid crystal display device, displays the drive state of the drive device 10 controlled by the control unit 24 as a digital value or an image, and has a speaker.

The control unit 24 is composed of a computer, to which the torque meter 18, the driving unit 22, and the display unit 26 are connected, inputs the + or-roll torque value from the torque meter 18, and outputs a control signal to the driving unit 22. Also, the motor torque value is detected and the display information is output to the display unit 26.

(2) Role of Control Unit 24 First, two roles of the control unit 24 of the drive device 10 will be described. The controller 24 has a first role of rotating the motor 20 and a second role of determining the traveling state of the web W.

The control unit 24 in the first role outputs a control signal to the drive unit 22 based on the preset rotation speed, and the drive unit 22 rotates the motor 20 to move the roll 12 in the traveling direction of the web W. Rotate along. At this time, the torque meter 18 outputs the output direction and the roll torque value to the control unit 24. Further, the control unit 24 detects the current motor torque value of the motor 20 based on the drive signal.

The control unit 24 in the second role serves as a determination device that determines whether the current traveling state of the traveling web W is a stable state, an unstable state, or a slipping state. The determination device is realized by the CPU of the control unit 24 executing a program stored in a storage medium such as a hard disk, a ROM, or a RAM in the control unit 24. First, the parameters used for the determination will be described.

“Tension T1” means the tension of the web W in front of the roll 12.

“Tension T2” means the tension of the web W behind the roll 12.

“Base tension T0” means the smaller tension of the tension T1 and the tension T2.

“Tension cut value ΔT” means ΔT=|T1−T2|.

“Area contact ratio ε” means the ratio of the area where the web W is in contact with the roll 12 to the entire area of the roll 12, and when the roll 12 is entirely flat, ε=1, grooves on the surface, etc. When is carved, for example, ε=0.9.

“Roll torque value N1” means the torque value detected by the torque meter 18, and the output direction is indicated by + or −. For example, when the rotation moment of the rotation shaft 14 is higher than the rotation moment of the output shaft 28, it is +, and when it is the opposite, it is −.

The “motor torque value N2” means the torque value of the motor 20 detected by the control unit 22.

“Holding angle θ” means an angle at which the roll 12 and the web W are in contact with each other, as shown in FIG. 1, and is 15°<=θ<=270°.

First, the control unit 22 obtains the theoretical friction coefficient μ0 and the measured friction coefficient μ1 from the above parameters.

“Theoretical friction coefficient μ0” is obtained from the following equation (1). The theoretical friction coefficient μ0 is calculated in advance before running the web W and stored in the control unit 22.

μ0=[log _e {ΔT/(T0·ε)+1}]/θ (1)

“Measurement friction coefficient μ1} is calculated at every predetermined measurement time (for example, every 0.1 seconds) from the equation (2).

μ1=[log _e {N0/(R·T0)+1}]/θ (2)

However, N0 is a drive torque value, N0=|N1+N2| when T1<T2, and N0=|N1+(N1-N2)| when T1>T2.

Next, the control unit 24 obtains the difference between the calculated measured friction coefficient μ1 and the theoretical friction coefficient μ0 from the equation (3) at every predetermined measurement time.

α=(μ0−μ1)/μ0·100 (3)

Next, the control unit 22 determines whether or not the difference α is within a predetermined reference range β for each predetermined measurement time.

Next, the control unit 22 determines the traveling state of the web W based on the following three rules.

The first rule is that when the difference α is within the reference range β and the output direction measured by the torque meter 18 has a constant stable duration, it is determined that the traveling state of the web W is the “stable state”. To do. The stable duration is, for example, 10 seconds. The stable state refers to a state in which the web W is running normally with a constant driving force being stably applied to the rotating roll 12.

The second rule is that when the difference α is within the reference range β and the output direction of the torque meter 18 changes multiple times during the stable duration, the running state of the web W is “unstable state”. Is determined. The unstable state is a state in which the web W is not normally traveling due to an unstable changing driving force given by the rotating roll 12.

The third rule is that when the difference α is outside the reference range β and the output direction of the torque meter 18 is constant for a stable duration, it is determined that the running state of the web W is the “sliding state”. The sliding state is a state in which the web W is slipping on the rotating roll 12 and the web W may be damaged.

Finally, the control unit 24 displays on the display unit 26 whether the stable state, the unstable state, or the slip state.

When the operator sees the display unit 26 and the traveling of the web W is stable, the operator causes the traveling of the web W as it is. When the web W is in an unstable state, the tension T1 or the tension T2 of the web W is changed or the traveling speed of the web W is reduced. Since the web W may be scratched in the slipping state, the traveling is stopped.

(3) Effects According to the present embodiment, the control unit 24 can determine whether the current traveling state of the web W is a stable state, an unstable state, or a slipping state. Therefore, the operator can control the drive device 10 according to the state.

(4) Modification Example In the above-described embodiment, the output shaft 28 of the motor 20 is directly connected to the torque meter 18, but a direct drive system is used instead of the torque meter 18, as shown in FIG. May be disposed between the motor 20 and the motor 20, or a connecting portion 32 may be provided between the motor 20 and the speed reducer 30 by a drive belt as shown in FIG.

In addition, the control unit 24 may generate an alarm sound from a speaker in addition to displaying on the display unit 26 in the unstable state and the slipping state.

Although one embodiment of the present invention has been described above, this embodiment is presented as an example and is not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and the gist of the invention, and are also included in the invention described in the claims and an equivalent range thereof.

10... Drive device, 12... Roll, 14... Rotation shaft, 16... Bearing, 18... Torque meter, 20... Motor, 22... Drive unit, 24... Control unit, 26... Display unit

Claims (6)

A roll to run the web,
A motor for rotating the roll,
A torque meter disposed between the rotation shaft of the roll and the output shaft of the motor,
The measured friction coefficient μ1 is obtained from the roll torque value N1 measured by the torque meter and the motor torque value N2 of the motor, and the difference α between the theoretical friction coefficient μ0 and the measured friction coefficient μ1 stored in advance is a predetermined reference range β. Within, and, if the output direction measured by the torque meter is a constant stable time, a control unit that determines that the web is traveling stably,
Have
The control unit is
When the tension of the web before the roll is T1 and the tension of the web after the roll is T2, the tension cut value ΔT=|T1-T2|
The smaller value of the tension T1 and the tension T2 is defined as the base tension T0,
The holding angle of the web on the roll is θ,
When the area contact ratio ε that the web is in contact with the roll,
(1) The theoretical friction coefficient μ0 is obtained from the tension cut value ΔT, the base tension T0, the area contact rate ε, and the holding angle θ.
μ0=[log _e {ΔT/(T0·ε)+1}]/θ
From
(2) The measured friction coefficient μ1 is obtained from the roll torque value N1 and the motor torque value N2, the roll drive torque value N0, the roll radius R, the base tension T0, and the tension cut value ΔT=| T1-T2| and the included angle θ, and the measured friction coefficient μ1 is
μ1=[log _e {N0/(R·T0)+1}]/θ
However,
When T1<T2, N0=|N1+N2|,
When T1>T2, N0=|N1+(N1-N2)|
The determination device. The control unit determines that the traveling of the web is unstable when the difference α is within the reference range β, and the output direction is not constant for the stable duration time,
The determination device according to claim 1. The control unit determines that the traveling of the web is in a slipping state when the difference α is outside the reference range β, and the output direction is constant for the stable duration time,
The determination device according to claim 1. The roll winds the web at a wrapping angle θ of 15° to 270° and runs the web.
The determination device according to claim 1 . The roll is a nip roll, a suction roll, or a drive roll,
The determination device according to claim 1. A speed reducer is provided between the torque meter and the motor,
The determination device according to claim 1.

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