JP4599703B2 - Steel plate damping device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a steel plate damping device that suppresses vibrations of a strip-shaped steel plate that travels on a road surface in a rolling line, a surface treatment line, or the like of an iron manufacturing facility.
[0002]
[Prior art]
Conventionally, there has been a vibration damping device that suppresses vibration of a traveling steel sheet by means of an electromagnet pair that is disposed opposite to the front surface and the back surface across the traveling steel sheet. Such a vibration damping device has a plurality of electromagnet pairs arranged in the width direction of the steel sheet perpendicular to the traveling direction of the steel sheet. Each electromagnet is provided with a displacement sensor that detects the displacement of the distance from the electromagnet to the steel plate. Based on the displacement detected by the displacement sensor, the excitation current flowing through the electromagnet is controlled to control the magnetic force generated by the electromagnet. However, there is one that controls the attractive force exerted on the steel plate by the electromagnet to suppress the vibration of the steel plate.
[0003]
In such a vibration damping device, the steel plate meanders in the width direction perpendicular to the running direction while running, and the end of the steel plate has several electromagnet pairs out of a plurality of electromagnet pairs arranged in the width direction of the steel plate. Since there is a case that the pair of electromagnets is separated, there is one that turns off the excitation current that flows through the electromagnet whose end of the steel plate is detached based on the plate width information of the steel plate.
[0004]
[Problems to be solved by the invention]
However, none of the vibration damping devices as described above takes into account the case where the end of the steel plate is halfway between the electromagnet pair, such as when a lateral displacement of the plate occurs. That is, when the end of the steel plate is halfway between the electromagnet pair, the displacement sensor in the electromagnet may not be able to accurately detect the displacement of the distance from the electromagnet to the steel plate. As a result, the control of the excitation current flowing through the electromagnet becomes inaccurate, and the control of the steel plate becomes inaccurate, and as a result, the end of the steel plate may collide with the electromagnet.
[0005]
In particular, when using an eddy current sensor frequently used as a vibration control device for a steel plate as a displacement sensor, in order to accurately detect the displacement of the distance from the electromagnet to the steel plate, the surface of the steel plate facing the displacement sensor is The diameter of the probe of the displacement sensor must be within the range of several times the diameter. Therefore, if the surface of the steel plate does not cover the entire range, the displacement cannot be detected accurately, and the control of the steel plate becomes inaccurate.
[0006]
The present invention has been made to solve the above-described problem, and provides a vibration damping device capable of accurate control of a steel plate even when the end of the steel plate is halfway between electromagnet pairs. To do.
[0007]
[Means for Solving the Problems]
According to the first aspect of the present invention, one channel detects an electromagnet that causes a magnetic force to act on the front surface or the back surface of a traveling steel sheet when an exciting current is passed, and a displacement of the distance between the electromagnet and the steel sheet. A displacement sensor and a presence / absence sensor for detecting presence / absence of the steel plate, wherein a plurality of the channels are arranged in a width direction of the steel plate intersecting a direction in which the steel plate travels, and the presence / absence sensor of each channel includes the steel plate. On the condition that this is detected, the excitation current flowing through the electromagnet of the channel including the presence sensor is turned on, and the electromagnet of the channel including the displacement sensor is turned on based on the displacement detected by the displacement sensor included in each channel. Control means for controlling the amount of exciting current to flow, the position of the presence sensor in the width direction of the steel sheet is detected by the displacement sensor. It is the vibration damping apparatus of the steel sheet, characterized in that there is a range the same location or outside the boundary position required.
[0008]
The invention according to claim 2 is the steel plate vibration damping device according to claim 1, wherein two presence sensors are provided in one channel.
[0009]
The invention according to claim 3 is the steel plate vibration damping device according to claim 1, wherein the presence sensor is provided only in a range in which an end in the width direction of the steel plate can vary. .
[0010]
According to a fourth aspect of the present invention, the position in the width direction of the steel sheet of the presence / absence sensor of each channel is the same as the boundary position of the range where the displacement sensor is required for detection of displacement, and the width direction of the steel sheet. 4. The steel plate vibration damping device according to claim 3, wherein the end of the steel plate is positioned outside the range in which the end of the steel plate cannot fluctuate.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The configuration of the first embodiment of the present invention will be described. First, the configuration for one channel in the present embodiment will be described with reference to FIG. One channel includes an electromagnet 1, a displacement sensor 2, and two presence / absence sensors 3. The electromagnet 1 causes a magnetic force to act on the steel plate 4 at a position facing the electromagnet 1 when an exciting current is passed, and suppresses vibration of the steel plate 4. The displacement sensor 2 is provided inside the electromagnet 1 and detects the displacement of the distance between the electromagnet 1 and the steel plate 4. Based on the displacement detected by the displacement sensor 2, a control means (not shown) controls the exciting current flowing through the electromagnet 1, controls the magnetic force generated by the electromagnet 1, and the attraction force exerted on the steel plate 4 by the electromagnet 1. Control and suppress vibration of steel sheet. The displacement sensor 2 can detect the displacement accurately when the surface of the steel plate 4 is present in all portions within the range 2a. An example of such a displacement sensor 2 is an eddy current displacement sensor.
[0012]
The two presence / absence sensors 3 are for detecting the presence / absence of the steel plate 4 and are arranged in the width direction of the steel plate 4. The width direction of the steel plate 4 is a direction perpendicular to the traveling direction of the steel plate 4. The positions of the two presence / absence sensors 3 in the width direction of the steel plate 4 are the boundary positions of the range 2a necessary for the displacement sensor 2 to accurately detect the displacement. That is, the straight line 3a passing through the two presence / absence sensors 3 and parallel to the traveling direction of the steel plate 4 is in contact with the boundary line of the range 2a necessary for the displacement sensor 2 to detect accurate displacement. Only when both the presence / absence sensors 3 detect that the steel plate 4 is present, the excitation current that flows through the electromagnet 1 is turned on.
[0013]
Next, the overall configuration of the present embodiment will be described with reference to FIG. Seven channels including the electromagnet 1, the displacement sensor 2, and the two presence / absence sensors 3 described above are arranged in the width direction on the surface side of the steel plate 4. Further, similar channels are also arranged on the back surface side of the steel plate 4, and the front surface side channel and the back surface side channel are arranged to face each other with the steel plate 4 interposed therebetween.
[0014]
Next, the operation of this embodiment will be described. Only when both of the two presence / absence sensors 3 included in each channel detect that the steel plate 4 is present, the electromagnet 1 of the channel including these two presence / absence sensors 3 is turned on. Only when 2 covers the entire range 2a necessary for accurate displacement detection, the electromagnet 1 of the channel including the displacement sensor 2 is turned on. In the example shown in FIG. 2, the third to sixth electromagnets 1 from the left are turned on.
[0015]
Next, the overall configuration of the second embodiment of the present invention will be described with reference to FIG. In the present embodiment, the end 4 a of the steel plate 4 does not fall within a certain range 5. In this case, the presence / absence sensor 3 may be provided only outside the boundary of the range 5, and one presence / absence sensor 3 may be provided for one channel. The position where the presence / absence sensor 3 is provided in one channel is a position outside the range 5.
[0016]
The two boundaries of the range 5 described above are close to each other, and both of the two boundaries pass through the range 2a necessary for the displacement sensor 2 to detect accurate displacement in one channel, as shown in FIG. Thus, when two boundaries are coincident and the coincident boundary passes within the range 2a necessary for accurate displacement detection in one channel, the displacement boundary 2 passes only to this channel. Two presence / absence sensors 3 are provided.
[0017]
As the presence sensor 3 described above, a transmissive photoelectric sensor, a reflective photoelectric sensor, a proximity switch, or the like can be used. When a transmissive photoelectric sensor is used, a light emitting head is disposed on one side of the steel plate 4 and a light receiving head is disposed on the opposite side of the steel plate 4. When a reflective photoelectric sensor or a proximity switch is used, the sensor is disposed on one side or both sides of the steel plate 4. When the sensors are arranged on both sides of the steel plate 4, the sum of the detectable distances of the two opposing sensors is made larger than the distance between the two sensors, and the range in which the two sensors cannot be detected is eliminated. When the two opposing sensors do not detect the steel plate 4, it can be determined that there is no steel plate 4, and in other cases, it can be determined that the steel plate 4 is present. Thereby, even if it is a sensor with a short detectable distance, the presence detection of the steel plate 4 can be performed reliably.
[0018]
【The invention's effect】
According to the present invention, the electromagnet corresponding to the displacement sensor is turned on only under the condition that the displacement sensor can accurately detect the displacement of the steel plate. Therefore, when the end of the steel plate is halfway between the electromagnet pairs. This electromagnet pair is not turned on, and the control of the steel plate does not become unstable. As a result, the steel sheet can be accurately controlled.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration for one channel in a first embodiment of the present invention.
FIG. 2 is an overall configuration diagram of the first embodiment of the present invention.
FIG. 3 is an overall configuration diagram of a second embodiment of the present invention.
FIG. 4 is a diagram showing a case where two boundaries are coincident and the coincident boundary passes through a range 2a in one channel.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Electromagnet 2 Displacement sensor 2a Range 3 Existence sensor 3a Straight line 4 Steel plate 4a End 5 Range

Claims (4)

One channel is
An electromagnet that causes a magnetic force to act on the front surface or back surface of the traveling steel plate by passing an exciting current;
A displacement sensor for detecting the displacement of the distance between the electromagnet and the steel plate;
A presence sensor for detecting the presence or absence of the steel sheet,
A plurality of the channels are arranged in the width direction of the steel sheet intersecting the direction in which the steel sheet travels,
On condition that the presence / absence sensor that each channel has has detected that a steel plate is present, the excitation current that flows to the electromagnet of the channel that includes this presence / absence sensor is turned on, and based on the displacement detected by the displacement sensor that each channel has, Control means for controlling the amount of exciting current flowing through the electromagnet of the channel including the displacement sensor;
The position of the presence sensor in the width direction of the steel sheet is such that a straight line passing through the presence sensor and parallel to the direction in which the steel sheet travels is in contact with the boundary line of the range necessary for the displacement sensor to detect displacement. A steel plate damping device characterized by comprising: The presence sensor, the vibration damping device of the steel sheet according to claim 1, characterized in that are two not One provided in one channel. Each of the multiple channels
An electromagnet that causes a magnetic force to act on the front surface or back surface of the traveling steel plate by passing an exciting current;
A displacement sensor for detecting the displacement of the distance between the electromagnet and the steel plate;
And having
The plurality of channels are arranged in the width direction of the steel sheet intersecting the direction in which the steel sheet travels,
Of the plurality of channels, the channel provided in a range in which the end in the width direction of the steel plate can vary further includes a presence sensor for detecting the presence or absence of the steel plate,
On the condition that the presence / absence sensor detects that a steel plate is present, the excitation current flowing through the electromagnet of the channel including the presence / absence sensor is turned on, and the displacement is detected based on the displacement detected by the displacement sensor of each channel. Control means for controlling the amount of exciting current flowing in the electromagnet of the channel including the sensor
Have
The position of the presence sensor in the width direction of the steel sheet is such that a straight line passing through the presence sensor and parallel to the direction in which the steel sheet travels is in contact with the boundary line of the range necessary for the displacement sensor to detect displacement. and has <br/> vibration damping device of the steel plate you wherein a. Position in the width direction of the steel plate of the presence sensor passes the presence sensor, a direction and a straight line parallel to the steel sheet is traveling, of the position where the displacement sensor is in contact with a range of border required to detect the displacement The steel plate vibration damping device according to claim 3, wherein an end of the steel plate in the width direction is positioned outside a range in which the steel plate cannot fluctuate.

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