JP7354508B2 - roll rotation device - Google Patents

Description

The present invention relates to a roll rotation device.

A roll that conveys a long web or the like has its rotating shaft supported by a pair of left and right ball bearings, and one of the rotating shafts is rotated by a motor to rotate the roll at a predetermined rotational speed.

Japanese Patent Application Publication No. 2010-143712

In the roll rotation device as described above, there is a problem in that when the roll is rotated at a predetermined rotational speed, the roll may begin to vibrate and cause resonance.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide a roll rotation device that can prevent resonance of the roll and the parts supporting the roll.

The present invention provides a roll that conveys a web, a rotating shaft protruding from both left and right sides of the roll, a ball bearing that rotatably supports the rotating shaft, a motor that rotates the rotating shaft at a predetermined rotational speed, and a motor that rotates the rotating shaft at a predetermined rotational speed. The torque meter includes a control unit and a torque meter provided between an output shaft of a motor and the rotating shaft, and the torque meter detects a detected torque value of the rotating shaft from torsional distortion of the rotating rotating shaft. When the rotating shaft rotates, the number of times the detected torque value exceeds the reference torque value within a reference time is equal to or greater than a specified number of times, the roll, the ball bearing, and the rotating shaft are The control unit sets the rotational speed when the resonant state is not occurring as the initial setting of the rotational speed, rotates the rotating shaft at the initial setting of the rotational speed, and causes the rotational shaft to resonate. The state is determined based on the detected torque value, and when the number of times the detected torque value exceeds the reference torque value within a reference time is a predetermined number of times or more, the rotating shaft resonates. The present invention is a roll rotation device that changes the initially set rotation speed depending on the state.

According to the present invention, resonance of the roll rotation device can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram of a rotating device showing an embodiment of the present invention. FIG. 3 is a side view of the roll conveying the web. It is a graph showing a detected torque value and the passage of time. It is an explanatory view of a rotation device of a modification.

Hereinafter, a rotating device 12 for a roll 10 according to an embodiment of the present invention will be described with reference to the drawings.

Embodiment 1

A rotating device 12 for a roll 10 according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 3. The rotating device 12 rotates the roll 10 and conveys the elongated web W. Examples of the web W include film, paper, fabric, metal foil, and metal mesh.

(1) Structure of the rotation device 12 for the roll 10 The structure of the rotation device 12 for the roll 10 will be described with reference to FIGS. 1 and 2. The roll 10 is a metal roll or a rubber roll, and a pair of left and right rotating shafts 14 and 16 protrude from both left and right ends.

The rotating device 12 has a pair of left and right support legs 20 and 22 erected from a base 18, and ball bearings 24 and 26 are provided on the upper parts of the support legs 20 and 22, and the pair of left and right rotation shafts 14 and 16 are horizontally mounted. It is rotatably supported. One rotating shaft 16 further protrudes from the ball bearing 26 and is connected to a torque meter 28. The output shaft 32 of the motor 30 is also connected to the torque meter 28, and the torque meter 28 transmits the rotation of the output shaft 32 of the motor 30 to the rotating shaft 16, and also detects distortion from the torsion of the rotating shaft 16. Output as torque value.

A control unit 34 consisting of a computer controls the rotational speed of the motor 30 and receives a detected torque value from the torque meter 28 .

(2) Operation control of rotating device 12 Operation control of rotating device 12 will be explained. First, in the rotating device 12 for the roll 10, when the roll 10 is rotated at a predetermined rotational speed, the roll 10 may start to vibrate and cause resonance. This is because the natural vibration value of the roll 10 itself, the natural vibration value of the rotating shafts 14 and 16, the natural vibration value of the ball bearings 24 and 26, etc. match, causing resonance. The inventor conducted studies and experiments on how to measure this resonance, and created a method of measuring resonance using a torque value generated from torsional strain in the rotating shafts 14 and 16. That is, the inventor focused on the phenomenon that when resonance occurs in the rotating shafts 14, 16, etc., the torsional strain of the rotating shafts 14, 16 increases abnormally, detects this phenomenon with the torque meter 28, and detects the resonance. I created the idea of measuring. On this premise, the control unit 34 controls the operation of the rotating device 12.

First, when operating the rotating device 12, initial settings are performed. The control unit 34 changes the rotation speed of the motor 30 in stages, and changes the conveyance speed of the web W by a predetermined deceleration width or speed increase width. As a method for this change, for example, the rotational speed is increased stepwise from the first speed V1 to the second speed V2 and third speed V3 in FIG.

At a rotation speed that does not cause resonance, the detected torque value fluctuates within a predetermined range, as shown in FIG. For example, the first speed V1 to the third speed V3, the fifth speed V5, and the sixth speed V6 are normal states in which no resonance occurs. However, when resonance occurs, the detected torque value fluctuates violently, resulting in a resonance state that greatly exceeds a predetermined reference torque value. In FIG. 3, this is the case, for example, when the motor is rotated at the fourth speed V4. If the number of times the detected torque value exceeds the reference torque value within a reference time (for example, 10 seconds) is equal to or greater than a predetermined number of times, the control unit 34 determines that resonance is occurring and changes the fourth speed. In order to avoid rotating the roll 10 at V4, the rotation speed is initially set to, for example, a third speed V3.

When the initial setting is completed and the control unit 34 performs normal operation, the roll 10 is rotated at the initially set third speed V3 to prevent resonance. During this normal operation, the control unit 34 constantly detects the detected torque value from the torque meter 28. Then, if the number of times the detected torque value exceeds the reference torque value within the reference time is equal to or greater than a specified number of times, the control unit 34 determines that a resonance state has occurred, and controls the third speed V3 to a predetermined deceleration width (for example, 5 m/min) and rotated at a second speed V2. The reason for doing this is that even if the rotational speed in a resonant state is avoided in the initial setting, each vibration eigenvalue changes due to aging of the roll 10, rotating shafts 14, 16, and ball bearings 24, 26 due to operation, causing resonance. This is because resonance may occur at a rotational speed different from the fourth speed V4 at which this occurs. The control unit 34 decelerates the motor 30 by a predetermined deceleration width in order to rotate the motor 30 so as to avoid the newly determined rotational speed at which resonance occurs (for example, the third speed V3).

(3) Effects According to this embodiment, the rotational speed at which resonance occurs is discovered in the initial settings, and the roll 10 is rotated avoiding the rotational speed at which resonance occurs in normal operating conditions, so that resonance does not occur. do not have.

Furthermore, even if the natural vibration values of the roll 10, rotating shafts 14, 16, ball bearings 24, 26, etc. change due to aging during normal operation, the control unit 34 controls the torque value detected by the torque meter 28. Since it is constantly monitored, the rotation speed can be changed accordingly to prevent resonance from occurring.

Embodiment 2

A rotating device 12 for a roll 10 according to a second embodiment of the present invention will be described with reference to FIG. 4. In the first embodiment, as shown in FIG. 1, the output shaft 32 of the motor 30 is directly connected to the torque meter 28.

Instead, in this embodiment, as shown in FIG. A belt 42 may be provided between the pulley 38 and the pulley 40. In this case, the output of the motor 30 is decelerated by the reducer 36 via the pulleys 38 and 40, and reaches the torque meter 28, allowing the rotating shaft 16 to rotate at the reduced speed.

Even in this embodiment, the control unit 34 monitors the torque value detected by the torque meter 28 to find the rotational speed at which resonance occurs.

Example of change

In the above embodiment, when changing the rotational speed so that resonance does not occur, the control unit 34 decelerates the rotational speed by a predetermined deceleration width. The speed may be increased from the speed V4) by a predetermined speed increase width.

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, substitutions, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and gist of the invention, as well as within the scope of the invention described in the claims and its equivalents.

DESCRIPTION OF SYMBOLS 10... Roll, 12... Rotating device, 14... Rotating shaft, 16... Rotating shaft, 28... Torque meter, 30... Motor, 32... Output shaft, 34...・Control unit

Claims (4)

A roll that conveys the web,
A rotating shaft protrudes from both the left and right sides of the roll,
a ball bearing that rotatably supports the rotating shaft;
a motor that rotates the rotating shaft at a predetermined rotational speed;
a torque meter provided between the output shaft of the motor and the rotating shaft;
a control unit;
has
The torque meter detects a detected torque value of the rotating shaft from torsional distortion of the rotating rotating shaft,
When the rotating shaft rotates, the number of times the detected torque value exceeds the reference torque value within a reference time is equal to or greater than a specified number of times is considered to be a state in which the roll, the ball bearing, and the rotating shaft resonate ,
The control unit sets the rotational speed when the resonant state is not occurring as the initial setting of the rotational speed, rotates the rotating shaft at the initial setting of the rotational speed, and determines whether or not the resonant state is present. , the determination is made based on the detected torque value,
When the number of times the detected torque value exceeds a reference torque value within a reference time is equal to or greater than a predetermined number of times, the rotational shaft is determined to be in the resonant state, and the initially set rotational speed is changed;
Roll rotation device. The control unit is configured to reduce the initially set rotational speed of the roll by a predetermined deceleration width when the number of times the detected torque value exceeds the reference torque value within the reference time is equal to or greater than the specified number of times. let,
The roll rotation device according to claim 1. The control unit increases the initially set rotational speed of the roll by a predetermined speed increase width when the number of times the detected torque value exceeds the reference torque value within the reference time is equal to or greater than the specified number of times. increase speed,
The roll rotation device according to claim 1. a reducer is provided between the torque meter and the motor;
The roll rotation device according to claim 1.

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