JPH05245523A - Damping device of steel sheet - Google Patents

Abstract

PURPOSE:To prevent the belt like steel sheet line from vibrating by providing the electromagnet that the non contacting position detecting unit is assembled at both sides of the surface of running path of the steel sheet and controlling meandering. CONSTITUTION:A deviation detecting unit 14 projecting a supporting body 18 is attached at an electromagnet 12 provided by winding coils 16, 17 at both leg parts of the U shape iron core 15. An electromagnet 13 having no position detecting unit 14 is provided at the opposite side of the surface of running path of the steel sheet. Because the position of the detecting unit 14 detecting the vibration of the steel sheet 10 is aligned with the position of the electromagnet 12, 13 applying the force to the steel sheet 10 for damping, the vibration phenomenon following to the deviation of both positions can be perfectly prevented. A control unit 19 damps by applying the force to the steel sheet 10 with a proportion compensating unit 22, a differencial compensating unit 23 and an integral compensating unit 24 based on the signal of the position detecting unit 14.

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 of a rolling line, a surface treatment line, etc. of a steelmaking facility. ..

[0002]

2. Description of the Related Art For example, in a hot dip galvanizing line,
Excessive molten zinc is blown off by ejecting pressurized air or pressurized gas from a nozzle having a slit-shaped ejection port, and ejecting this ejected flow onto a steel sheet to be plated that is pulled up through a molten zinc bath. 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 changes, 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 damping vibration of a steel plate during traveling by using an electromagnet 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 position detector 5 is arranged in the vicinity of one of the electromagnets 4, and the controller 6 responds to the signal from this position detector 5 to attract each electromagnet 3, 4 This is a technology that reduces vibration and C warpage of the running steel plate 1 while switching between forces.

[0005]

In the conventional damping technology,
Since the electromagnets 3, 4 and the position detector 5 are displaced in the direction of the running surface 2, the position detector 5 detects the position of the steel plate 1 and the electromagnets 3, 4 apply a force to the steel plate 1. Different from the vibration damping part to be added, the effect becomes low for the high frequency of the steel plate 1, and it may oscillate conversely.

Therefore, according to the conventional damping device, as shown by the solid line in FIG. 9, the damping effect is higher for higher frequencies than when the damping device is not used (dotted line in the figure). Poorly, the frequency may increase. That is, when the steel plate 1 vibrates about the track surface 2 as shown in FIG.
The current of the electromagnets 3 and 4 is proportionally controlled by the controller 6 using the signal of 5, and a force proportional to the deviation of the steel plate 1 from the track surface 2 is applied to the steel plate 1 from the electromagnets 3 and 4. Since the position detector 5 recognizes that the steel plate 1 is on the right side of the road surface 2, the controller 6 tries to suppress the vibration of the steel plate 1 by applying a current to the left electromagnet 3.

However, in reality, at the positions of the electromagnets 3 and 4,
Steel plate 1 is to the left of track surface 2 and is therefore
The vibration of 1 cannot be suppressed, and is returned and amplified. In this state, the signal of the position detector 5 is differentiated once to perform differential compensation, that is, a force proportional to the magnitude of the vibration speed of the steel sheet 1 is applied to the steel sheet 1 by the electromagnets 3 and 4. For example, in the state of FIG. 8, if the speed of the steel plate 1 at the detection portion of the position detector 5 is rightward, the controller 6 sends a current to the left electromagnet 3 to dampen the vibration of the steel plate 1. Try to add force.

However, in this case as well, the steel plate 1 has the electromagnets 3, 4
At the position of, since it actually has a leftward vibration speed, the leftward speed is accelerated by passing a current through the electromagnet 3, and the vibration of the steel sheet 1 is oscillated in the opposite direction without being suppressed. . In view of such conventional problems, the present invention provides a vibration damping device capable of stably traveling along a track surface without vibrating a steel plate.

[0009]

Means for Solving the Problems As a means for achieving the above, the present invention is arranged symmetrically on both sides of a track surface 11 on which a strip-shaped steel plate 10 is to be run, with a predetermined distance from the track surface 11. A pair of electromagnets 12 and 13, a non-contact type position detector 14 incorporated in one electromagnet 12, and the position detector 14
And a controller 19 for controlling the attraction force of each electromagnet 12, 13 by performing signal processing such as proportionality, integration, and differentiation based on the signal of.

[0010]

[Operation] The displacement of the strip-shaped steel plate 10 traveling on the track surface 11 is detected by the position detector 14, and the controller 19 performs signal processing such as proportional, integral, and derivative based on the signal, and each electromagnet 12 , 1
The suction force of 3 is controlled, and the vibration of the steel plate 10 is controlled. Since the position detector 14 is incorporated into one of the pair of symmetrically arranged electromagnets 12 and 13, the position of the position detector 14 is controlled by the electromagnets 12 and 13. The vibration parts coincide with each other, and stable vibration suppression of the steel plate 10 can be performed.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings. In FIG. 1, 10 is a strip-shaped steel plate, and 11 is a track surface on which the steel plate 10 travels in the arrow direction. 12,13 are electromagnets,
They are symmetrically arranged on the left and right sides of the track surface 11 with a predetermined distance from the track surface 11.

Reference numeral 14 is a non-contact type position detector for detecting the displacement of the steel plate 10, and is incorporated in the central portion of one of the pair of electromagnets 12, 13. That is, the electromagnet 12 is, as shown in FIGS. 2 and 3, a coil 16 and 17 wound around both legs of a U-shaped iron core 15. A support 18 is provided so as to project from the center of the iron core 15 between the coils 16 and 17, and a displacement detector 14 is attached to the tip of the support 18. Therefore, the position detector 14 includes coils 16 and 17 of the electromagnet 12.
It is located in the middle of.

Reference numeral 19 is a controller for controlling the electromagnets 12 and 13 by switching the electromagnets 12 and 13 based on the signal from the position detector 14, and as shown in FIG. 4, an amplifier 20, a reference position setting circuit 21, and a proportional compensator.
22, a differential compensator 23, an integral compensator 24, an adder 25, a power amplifier 26 and the like. The reference position setting circuit 21 is for setting a reference position when correcting the warp of the steel plate 10, that is, a zero point position. The proportional compensator 22 is for flowing a current proportional to the displacement of the steel plate 10 to the electromagnets 12 and 13. The differential compensator 23 is for passing a current proportional to the speed of the steel plate 10 through the electromagnets 12, 13. The integral compensator 24 integrates the deviation of the steel plate 10 from the track surface 11 to generate a current through the electromagnets 12, 13
It is intended for flushing. The adder 25 is for adding the signals which have been proportionally compensated, differentially compensated and integral compensated. The power amplifier 26 is for amplifying the signals added by the adder 25 to the power required to drive the electromagnets 12, 13.

In the above structure, the position detector 14 is used to
Of the controller, based on the output signal thereof, the proportional compensator 22, the derivative compensator 23, and the integral compensator 24 of the controller 19 perform proportional compensation,
Perform differential compensation and integral compensation. In the proportional compensation, a current proportional to the displacement of the steel plate 10 is caused to flow through the electromagnets 12 and 13 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 plate 10 is caused to flow through the electromagnets 12 and 13 to generate a force, so that positive damping is added to the steel plate 10. Furthermore, integral compensation is performed by integrating the deviation of the steel plate 10 from the track surface 11 into the electromagnets 12, 1
In order to generate a force by passing an electric current through the
Vibration is controlled so that the deviation from is zero.

Then, after adding these proportionally-compensated, differentially-compensated and integral-compensated signals by an adder 25, the power is amplified by a power amplifier 26 to drive the electromagnets 12, 13 while switching them. 13 applies force to steel plate 10 to suppress vibration. At this time, the displacement detector 14 is incorporated inside the electromagnet 12, and the detection part for detecting the vibration of the steel plate 10 by the position detector 14 and the vibration suppression part by applying the force to the steel plate 10 by the electromagnets 12, 13 are used. Since they match, it is possible to prevent the oscillation phenomenon of the steel sheet 10 caused by the displacement of both parts, and to perform stable vibration damping.

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. Note that, in FIG. 5, the high peak portion indicates that the steel plate 10 is likely to vibrate at the frequency. According to this FIG. 5, by using the vibration damping device according to the present invention, the frequency at which the steel plate 10 easily vibrates, that is, the steel plate.
Damping is effectively applied to 10 natural frequencies,
It can be seen that the amplitude can be suppressed to 1/10 or less.

FIG. 6 shows a response characteristic when a stepwise disturbance is applied to the steel plate 10. (A) is the case where the vibration damping device according to the present invention is not used, and (B) is the case where it is used. From these, it can be seen that the damping effect is improved when the damping device of the present invention is operated. FIG. 7 shows another embodiment of the present invention, in which vibration is suppressed while correcting the warp of the steel sheet 10 in the width direction. On both sides of the track surface 11, a plurality of, for example, four electromagnets 12a, 12 are arranged at equal intervals in the width direction of the steel plate 10.
b, 12c, 12d, 13a, 13b, 13c, 13d are arranged symmetrically, and the position detectors 14a, 14b,
14c and 14d are installed respectively.

In this case, the displacements of the steel plate 10 at each portion are detected by the position detectors 14a, 14b, 14c, 14d, and the electromagnets 12a, 12b,
The currents of 12c, 12d, 13a, 13b, 13c, 13d are controlled.
In this state, the electromagnets 12a, 12
b, 13b, 12c and the electromagnets 12b, 12c, 13a, which have small intervals
The warp of the steel plate 10 can be corrected by making a difference in the suction force with respect to 13d.

Two or more electromagnets 12, 13 and position detectors 14 may be provided in the traveling direction of the steel plate 10. Further, as the position detector 14, a displacement converter, a speed converter or the like may be used. In addition, the controller 19 is proportional compensation, differential compensation,
Optimal control compensation may be performed instead of integral compensation, and when only a damping function is provided, only differential compensation or only differential compensation and proportional compensation may be performed.

[0020]

According to the present invention, a pair of electromagnets 12 and 13 are symmetrically arranged on both sides of the running surface 11 on which the strip-shaped steel plate 10 is to be run, with a predetermined distance from the running surface 11. And a non-contact type position detector built in one electromagnet 12
14 and a controller 19 for controlling the attraction force of each electromagnet 12, 13 by performing signal processing such as proportional, integral, and derivative based on the signal of the position detector 14, so that the steel plate 10 The vibration damping effect with respect to the frequency is also improved, and the steel plate 10 can be stably run along the track surface without vibrating.

[Brief description of drawings]

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

FIG. 2 is a plan view of the electromagnet.

FIG. 3 is a front view of the electromagnet.

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

FIG. 5 is a vibration damping characteristic diagram of the same.

FIG. 6 is a response characteristic diagram of the same.

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 vibration damping characteristic diagram of the same.

[Explanation of symbols]

 10 Steel plate 11 Track surface 12 Electromagnet 13 Electromagnet 14 Position detector 19 Controller

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Minor Kato 8-35-514 Tsuchiyama-cho, Nada-ku, Kobe-shi, Hyogo Prefecture (72) Inventor Yoshihiro Hamasaki 1-2-102 Gakuen-higashi-cho, Nishi-ku, Kobe-shi, Hyogo (72) Invention Masaya Nakamura 1001 Futamata, Hiraoka-cho, Kakogawa-shi, Hyogo 1001 (72) Kazuhiko Gondo 1001 Futamata, Hiraoka-cho, Kakogawa-shi, Hyogo Prefecture (72) Yutaka Kurita 100 Takegahana-cho, Ise-shi, Mie Prefecture 100 Ise Works

Claims (1)

[Claims] 1. A pair of electromagnets (12) symmetrically arranged on both sides of a track surface (11) on which a strip-shaped steel plate (10) is to be run, with a predetermined gap from the track surface (11). (13) and a non-contact type position detector (14) incorporated inside one electromagnet (12)
And a controller (19) for controlling the attraction force of each electromagnet (12) (13) by performing signal processing such as proportional, integral, and derivative based on the signal of the position detector (14). A vibration control device for steel plates.