JPH067825A - Vibration proofing device for steel sheet - Google Patents

Abstract

PURPOSE:To efficiently control the vibration of a steel sheet without being affected by the vibration mode by providing plural electromagnets in the traveling direction of the steel sheet so as to correspond to the position of the belly of the vibration mode which is made to an object for vibration proof. CONSTITUTION:The displacement amount of the beltlike steel sheet 10 for traveling along a traveling path 11 is detected by position detectors 18 and 19, an electric current based on its signal is carried to the electromagnets 14 and 15, and 16 and 17, the attraction force of the electromagnet 14 and 15, and 16 and 17 is changed and the vibration of the steel sheet 10 is suppressed. Since the electromagnets 14 and 15, and 16 and 17 are corresponded to the belly of the vibration mode which is made to an object for the vibration proof of the steel sheet 10 at this time, the steel sheet 10 can be subjected to vibration proofing efficiently for each vibration mode.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel plate damping device for damping the vibration of a strip-shaped steel plate running on the road surface in a rolling line, a surface treatment line or the like of an iron making facility. .

[0002]

2. Description of the Related Art For example, in a hot dip galvanizing line,
Pressurized air or pressurized gas is jetted from a nozzle having a slit-shaped jet port, and this jet stream is jetted to the steel sheet to be plated that has been pulled up through a molten zinc bath to blow off excess molten zinc. Generally, the required plating thickness is achieved.

In such a case, if the steel plate vibrates with respect to the running surface, the distance between the nozzle and the steel plate fluctuates, and as a result,
The ejection force may fluctuate and the plating thickness may become non-uniform, resulting in deterioration of quality. Therefore, conventionally, Japanese Patent Publication No.
As described in Japanese Patent Laid-Open Publication No. 2004-242242, a method of utilizing an electromagnet to suppress the vibration of a running steel plate is adopted.

This is a strip-shaped steel plate, as shown in FIG.
1 is a pair of electromagnets with respect to the track surface 2 traveling in the direction of the arrow
3 and 4 are arranged, a non-contact type displacement detector 5 is arranged near one of the electromagnets 4, and the controller 6 responds to the signal from the displacement detector 5 to attract the electromagnets 3 and 4. It is a technology that reduces the vibration and C warpage of the running steel plate 1 while switching the forces between each other.

[0005]

In the conventional vibration damping technology,
Since the vibrations of the steel plate 1 are merely suppressed by mutually switching the attraction forces of the pair of electromagnets 3 and 4, there is a problem that the traveling steel plate 1 cannot be efficiently damped. For example, the electromagnets 3 and 4 with a wire diameter of 0.4 mm, a winding number of 1200 turns, an iron core pole cross section of 15 mm x 30 mm, an iron core pole interval of 30 mm, an attractive force effective area of 40 mm x 70 mm, an attraction force of 0.5 kgf, and a time constant of 7 msec. When used, vibration can be controlled up to 500Hz.

Steel plate 1 in a state of being damped by electromagnets 3 and 4
The positional relationship between the vibration mode and the electromagnets 3 and 4 is as shown in FIG. When the electromagnets 3 and 4 are in the a position, the vibration mode of the steel plate 1 has two patterns shown in FIGS. 9 (A) and 9 (B). Mode (A) has a frequency of 14 Hz,
(B) has a frequency of 30 Hz. Therefore, when the vibration of the steel plate 1 is in the mode (B), the electromagnets 3 and 4 are located at the vibration nodes even though the electromagnets 3 and 4 have the response capability, so that the electromagnets 3 and 4 suppress the vibration. It becomes impossible to shake, and the damping effect decreases.

The present invention has been made in view of such conventional problems.
The purpose is to efficiently suppress the vibration of the steel plate without being affected by the vibration mode.

[0008]

SUMMARY OF THE INVENTION According to the present invention, the position detectors 18, 1 detect the displacement amount of a strip-shaped steel plate 10 traveling along a track surface 11.
9 and the electric current is passed through the electromagnets 14,15,16,17 based on the signals from the position detectors 18,19.
In a vibration control device for a steel plate that suppresses the vibration of the steel plate 10 by changing the suction force for the steel plate 14, 15, 16 and 17, the steel plate is adjusted so as to correspond to the antinode position of the vibration mode to be controlled. A plurality of electromagnets 14, 15, 16 and 17 are provided in the traveling direction of 10.

[0009]

[Operation] The amount of displacement of the strip-shaped steel plate 10 traveling along the track surface 11 is detected by the position detectors 18, 19 and a current based on the signal is applied to the electromagnets 14, 15, 16, 17 to cause the electromagnets to move. 14,15,1
The vibration of the steel plate 10 is suppressed by changing the suction force of 6,17. At this time, since the electromagnets 14, 15, 16 and 17 correspond to the antinodes of the vibration modes of the steel plate 10 to be damped, the steel plate 10 can be efficiently damped in each vibration mode.

[0010]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 and 2, 10 is a strip-shaped steel plate, 11 is a running surface on which the steel plate 10 travels in the direction of the arrow, and is constituted by rollers 12, 13 and the like. On the left and right sides of this track surface 11,
Two positions a, which are separated by a predetermined distance in the traveling direction of the steel plate 10,
Electromagnets 14,15,16,17 are arranged in the object b.

The electromagnets 14, 15, 16 and 17 at the respective positions a and b are
As shown in FIG. 3, two different vibration modes A and B of the steel plate 10 are targeted for damping, and the former electromagnet 1
4,15 are the antinodes of vibration mode A, and the latter electromagnets 16,17
Are arranged so as to correspond to the antinodes of the vibration mode B, respectively. Further, four electromagnets 14, 15, 16 and 17 are provided at equal intervals in the width direction of the steel plate 10.

Reference numerals 18 and 19 are non-contact type position detectors for detecting the displacement of the steel plate 10. The pair of electromagnets 1 at each position a, b.
It is installed in the center of one of the electromagnets 15,17 of 4,15,16,17. That is, each of the electromagnets 14, 15, 16 and 17 is formed by winding a pair of coils around both legs of the U-shaped iron cores 20, 21, 22 and 23. One of the electromagnets 15,17 is provided with a support 24,25 protruding from the center of the iron core 22,23 between the pair of coils, and the position detectors 18,19 are provided at the tips of the support 24,25. Is installed. Therefore, the position detector
18,19 are located in the center between a pair of coils of electromagnets 15,17.

Reference numerals 26 and 27 are controllers for controlling the electromagnets 14, 15, 16 and 17 based on the signals from the position detectors 18 and 19. For example, as shown on the controller 26 side in FIG. Reference position setting circuit 29, proportional compensator 30, differential compensator 31, integral compensator 3
2, adder 33, steady-state voltage circuits 34 and 35, adders 36 and 37, power amplifiers 38 and 39, current minor compensators 40 and 41, etc.

The reference position setting circuit 29 is for setting a reference position when correcting the warp of the steel plate 10, that is, a zero point position. The proportional compensator 30 is for supplying a current proportional to the displacement of the steel plate 10 to the electromagnets 14 and 15. Differential compensator 31
Is for passing a current proportional to the speed of the steel plate 10 through the electromagnets 14 and 15. The integral compensator 32 is a steel plate 10 from the road surface 11.
This is for integrating the deviation of the current and passing a current through the electromagnets 14 and 15. The adder 33 is for adding the signals which have been proportionally compensated, differentially compensated and integral compensated. Power amplifier 38,3
9 is a signal obtained by adding the signals added by the adders 36 and 37 to the electromagnet 1
It is for amplifying to the power required to drive 4,15.

The steady voltage circuits 34 and 35 apply a steady voltage for flowing a steady current superimposed on the current from the adder 33. The adders 36 and 37 are for adding a steady current to the current from the adder 33. Current minor compensator 4
0 and 41 are for returning the current flowing in the electromagnets 14 and 15 to the input side of the adders 36 and 37, and for negatively feeding back the superimposed current.

In the above structure, the position detectors 18 and 19 detect the displacement of the steel sheet 10, and each controller is detected based on the output signal.
Proportional compensator 30, derivative compensator 31, and integral compensator 32 of 26 and 27 perform proportional compensation, derivative compensation, and integral compensation. In the proportional compensation, a current proportional to the displacement of the steel plate 10 is applied to each of the electromagnets 14, 15, 16 and 17 to generate a force, so that the same effect as adding a positive spring to the steel plate 10 is produced. In the differential compensation, a current proportional to the speed of the steel sheet 10 is applied to the electromagnets 14, 15, 16 and 17 to generate a force, so that positive damping is added to the steel sheet 10. Further, the integral compensation integrates the deviation of the steel sheet 10 from the track surface 11 to cause a current to flow through the electromagnets 14, 15, 16 and 17 to generate a force, so that the deviation of the steel sheet 10 from the track surface 11 becomes zero. To control.

The signals subjected to the proportional compensation, the differential compensation and the integral compensation are added by the adder 33 and sent to the adders 36 and 37. Then, in each adder 36, 37, the current from the adder 33 and the steady-state current from the steady-state voltage circuits 34, 35 are added, and the steady-state current is superposed on the current.
The power is amplified by and each electromagnet is driven. On the other hand, electromagnets 14,1
The currents flowing in 5, 16 and 17 are returned to the input side of the adders 36 and 37 by the current minor compensators 40 and 41 of the controllers 26 and 27, and the superimposed current is negatively fed back. This allows the electromagnets 14,15,
The suction force generated in 16, 17 is generated, and the force is applied to the steel plate 10 to suppress the vibration.

In this case, two types of vibration modes A and B of the steel plate 10 are targeted for damping, and the electromagnets 14, 15, 16 and 17 are provided so as to correspond to the antinodes of the respective modes A and B. A vibration damping force can be applied to the steel sheet 10 by the electromagnets 14, 15, 16 and 17 at the most vibrating portion of the steel sheet 10, and efficient vibration damping is possible. FIG. 5 shows the damping characteristics of the steel plate 10. The solid line shows the case where the damping device according to the present invention is activated, and the dotted line shows the case where the damping device is not used. In addition, in FIG. 5, a high mountain portion indicates that the steel plate 10 is likely to vibrate at the frequency. According to this FIG. 5, by using the present invention, the steel plate 10
It can be seen that the vibration is effectively damped to the frequency at which the vibration easily occurs, that is, the natural frequency of the steel plate 10, and the amplitude can be suppressed to 1/10 or less.

On the other hand, FIG. 6 shows the damping characteristics of the conventional damping device. According to FIG. 6, it can be seen that there are vibration modes (30 Hz, 47 Hz, 95 Hz) in which the damping effect is not obtained. When the number of vibration modes to be damped is large, three or more electromagnets may be provided in the traveling direction according to the number of vibration modes.

As shown in FIG. 7, electromagnets 15 and 17 may be arranged on only one side of the steel plate 10. in this case,
The position detectors 18 and 19 may be incorporated in the electromagnets 15 and 17, but
It may be provided on the opposite side as shown in FIG. Further, as the position detectors 18 and 19, a displacement converter, a speed converter or the like may be used. Further, the controllers 26 and 27 may perform optimal control compensation instead of proportional compensation, differential compensation, and integral compensation.If only the damping function is provided, only differential compensation,
Alternatively, only differential compensation and proportional compensation may be used.

When the steel plate 10 is wide and vibrates in its width direction, electromagnets may be arranged in the width direction in consideration of the vibration mode.

[0022]

According to the present invention, since a plurality of electromagnets 14, 15, 16 and 17 are provided in the traveling direction of the steel plate 10 so as to correspond to the antinode position of the vibration mode to be damped, the steel plate is It is possible to efficiently control 10 vibrations.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is an enlarged view taken along line XX of FIG.

FIG. 3 is a diagram showing a relationship between the vibration damping mode and an electromagnet.

FIG. 4 is a block diagram of the control system.

FIG. 5 is a vibration characteristic diagram of the present invention.

FIG. 6 is a conventional vibration characteristic diagram.

FIG. 7 is a configuration diagram showing another embodiment of the present invention.

FIG. 8 is a configuration diagram showing a conventional example.

FIG. 9 is a diagram showing a relationship between a conventional vibration mode and an electromagnet.

[Explanation of symbols] 10 Steel plate 11 Track surface 14 Electromagnet 15 Electromagnet 16 Electromagnet 17 Electromagnet 18 Position detector 19 Position detector 26 Controller 27 Controller

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Minor Kato Minoru Kato 1-5-5 Takatsukadai, Nishi-ku, Kobe-shi, Hyogo Kobe Steel Works Seishin Research Area (72) Inventor Yoshihiro Hamasaki Nishi-ku, Kobe-shi, Hyogo Takatsukadai 1-5-5 Kobe Steel Co., Ltd. Seishin Research Area (72) Inventor Masaya Nakamura 1 Kanazawa-machi, Kakogawa City, Hyogo Prefecture Kadodo Steel Works Kakogawa Works (72) Inventor Kazuhiko Gondo 1 Kanazawa-machi, Kakogawa-shi, Hyogo Kadogawa Works, Kakogawa Works (72) Inventor Hiroshi Kurita 100, Takegahana-cho, Ise-shi, Mie Shinko Electric Co., Ltd. Ise Works

Claims (1)

[Claims] 1. A position detector (18) (19) detects the amount of displacement of a strip-shaped steel plate (10) traveling along a track surface (11), and the position detector (18) (19) is detected. Electromagnets based on signals from (14)
An electric current is passed through (15), (16) and (17), and the electromagnets (14) (15) and (1
6) Change the suction force of (17) on the steel plate (10) to change the steel plate (10)
In a steel plate damping device that suppresses the vibration of the steel plate, the electromagnets (14), (15), (16) (in the running direction of the steel plate (10) correspond to the antinode position of the vibration mode to be damped. A vibration damping device for steel plates, characterized in that a plurality of 17) are provided.