JPH0653919B2 - Anti-vibration device for steel strip in steel strip processing line - Google Patents

Description

TECHNICAL FIELD The present invention relates to a steel strip vibration-preventing device in a steel strip processing line, and more specifically, in a steel strip processing line The present invention relates to a device for preventing vibration of a steel strip in a portion which must be suppressed, for example, in a molten metal plating line of a steel strip by a gas wiping method or a coating line of a steel strip.

"Prior Art" For example, in a hot-dip galvanizing line for steel strips, as shown in FIG. 1, a steel strip 1 is continuously drawn from a hot-dip bath 2 and the widthwise direction of both sides of the drawn steel strip 1 is shown. The gas from the wiping nozzle 3 is jetted, and the surplus hot-dip galvanized metal on both surfaces of the steel strip 1 is wiped by the jetted gas, thereby controlling the plating basis weight.

The uniformity of the coating weight of the steel strip by the gas wiping method is uniform in the width direction of the gas ejected from the wiping nozzle, the uniformity of the ejection pressure of the wiping gas, and the gas ejection port of the one-pumping nozzle. It is almost determined by the uniformity of the distance to the steel strip.

Among these three elements, many improvement proposals have been made regarding the uniformity of the width direction of the gas and the uniformity of the injection pressure of the wiping gas.
Regarding the uniformity of the distance from the gas outlet of the wiping nozzle to the steel strip, the vibration that occurs because the steel strip is threaded in a long vertical distance between the sink roll and the top roll without contact and the steel strip Warp in the width direction (hereinafter referred to as C warp)
Therefore, it is extremely difficult to always maintain a constant distance between the wiping nozzle and the steel strip in the width direction of the steel strip, which is a major obstacle to obtaining a uniform coating weight.

Therefore, as disclosed in JP-A-57-85964 and JP-A-57-85965, permanent magnets are installed opposite to each other outside both edge portions of the steel strip in the vicinity of the wiping device. A means has been proposed in which tension in the width direction of the strip is applied to prevent the steel strip from swinging in the width direction and the thickness direction in a non-contact state.

[Problems to be Solved by the Invention] By the way, in the technique disclosed in the above-mentioned Japanese Patent Laid-Open Publication, the permanent magnets are installed opposite to each other on the outer sides of both edge ends of the steel strip, so that the width direction of the steel strip is simply increased. However, there is a problem that the vibration of the steel strip cannot be reliably prevented and the C-warp of the steel strip cannot be corrected.

An object of the present invention is to provide a vibration preventing device for a steel strip in a steel strip processing line, which solves the conventional problems.

"Means for Solving Problems" The gist of the present invention is to prevent vibration of a steel strip in which electromagnets having polarities different from each other are arranged facing each other on each side end surface of a steel strip traveling in a steel strip processing line. In the device, the plate surfaces are close to the front and back sides of each side end portion of the steel strip that is equidistant from the steel strip reference line, and each magnetic plate is arranged so that the side end faces are close to each electromagnet. This is a steel strip vibration prevention device in a steel strip processing line.

"Operation" By attracting each side end surface of the steel strip to the outer side by electromagnets having different polarities, which are arranged close to each other on each side end surface of the steel strip traveling in the steel strip processing line, The tension in the width direction is applied to suppress the vibration of the steel strip, and further, the plate surface approaches the front and back sides of each side end of the steel strip that is equidistant from the steel strip reference line. , Each magnetic plate arranged so that the side end faces of the electromagnets face each other in close proximity to each other, because the same polarity as the side end face of the steel strip is excited, the front and back sides of each side end of the steel strip. A repulsive force is generated between the magnetic plates facing each other and the end surface of each side of the steel strip, and the steel strip can be held on the threading reference line, thus vibrating the steel strip. The prevention and the C-warp correction of the steel strip can be reliably performed.

"Embodiment" Next, an embodiment of the device of the present invention will be described below with reference to FIGS.

This embodiment is intended for the steel strip on the wiping nozzle exit side of the molten metal plating line of the steel strip, and the device of the present invention is arranged on each side end side of the steel strip, Since the devices on each side end are symmetrical and identical, the device on one side end of the steel strip will be described here.

As shown in FIGS. 2 to 4, beams 4 are provided in the longitudinal direction of the upper surface of each wiping nozzle 3.
On the beam 4, a trolley 5 having a forked shape in the front half is cut out at the central portion of the front half and is movably mounted.

One side end of the steel strip 1 which is continuously and vertically drawn out from a hot dipping bath (not shown) is located on the center line of the moving direction in the notch 5a at the center of the front half of the carriage 5. ing.

The reason why the front half of the bogie 5 is notched and the front half of the bogie 5 is formed into a bifurcated shape is that side edges of the steel strip 1 depend on various plate widths of the steel strip 1 to be plated or meandering of the steel strip 1. This is so that the position of the carriage 5 with respect to the section can be adjusted.

On the base of the bifurcated portion 5b at the center line of the carriage 5 in the moving direction, an electromagnet 6 having an S-pole front end face is installed in close proximity to one side end face of the steel strip 1.

Although not shown, the front end face of the other electromagnet on the other bogie at the symmetrical position has the N pole.

Non-magnetic brackets 7 are provided at approximately intermediate positions on the bifurcated portion 5b of the trolley 5 so as to oppose each other in the passing plate reference line direction of the steel strip 1. The magnetic material plates 8 whose plate surfaces are close to the front and back sides of the respective side end portions of the steel strip 1 which are located equidistant from the strip-passing reference line of the steel strip 1 and whose side end faces are opposed to and close to the electromagnet 6.
Are provided respectively.

On the inner surface of the rear part of the bifurcated portion 5b of the trolley 5, the projector 9a is provided.
A photoelectric type steel strip edge detector 9 composed of a light receiving device 9b and a light receiver 9b is provided. Based on a detection signal from the steel strip edge detector 9, the driving means of the carriage 5 such as a fluid pressure cylinder is operated. The position of the carriage 5 is controlled.

By the position control of the carriage 5, the side end surface of the steel strip 1 and
The distance between the electromagnet 6 and the front end face is maintained at a predetermined value of 2 mm, for example.

Further, the center side of the steel strip 1 of each magnetic plate 8 is bent outwardly because the polarities of the bent side ends of each magnetic plate 8 are the electromagnet 6 side of each magnetic plate 8. Since the polarity is opposite to that of the side edge of the steel strip, if the steel strip is straight, it has a magnetic effect on the steel strip 1.
He kept away from him so that he would not reach.

Further, FIGS. 5 and 6 show other embodiments of the present invention, in which each magnetic material plate 8 is provided over the entire width of the steel strip 1, and both side ends thereof have polarities opposite to each other.

In each case, each magnetic plate 8 is not shown,
It is attached to the trolley via a non-magnetic bracket.

In the case shown in FIG. 5, both carriages are connected to each other by the magnetic plate 8, so that the drive means of the carriage and the steel strip edge detector may be provided on only one of the carriages.

In the case shown in FIG. 6, since each magnetic plate 8 is slidably inserted into the guide block 10, the guide block 10 is fixed to either one of the carriages, or one of the carriages is fixed. It may be fixed to one magnetic plate 8.

[Advantages of the Invention] As described above, according to the device of the present invention, each side of the steel strip is formed by the electromagnets having different polarities, which are arranged close to each other on the respective end faces of the steel strip traveling in the steel strip processing line. By sucking the end faces respectively outward, tension is applied to the steel strip in the width direction to suppress the vibration of the steel strip, but the steel strip is placed equidistant from the steel strip reference line. Since the plate surfaces are close to the front and back sides of the respective side end portions, and the respective magnetic plates arranged so that the side end surfaces are opposed to and close to the electromagnets are excited to have the same polarity as the side end portions of the steel strip. , A repulsive force is generated between the magnetic material plates facing the front and back sides of each side end of the steel strip and each side end face of the steel strip, and the steel strip is placed on the strip passing reference line. Therefore, the vibration of the steel strip can be prevented and the C warpage of the steel strip can be corrected. Wear.

[Brief description of drawings]

FIG. 1 is an explanatory view of molten metal plating on a steel strip by a gas wiping method, FIG. 2 is a plan view showing an embodiment of a vibration prevention device for a steel strip according to the present invention, and FIG. AA arrow view, FIG. 4 is a BB arrow view of FIG. 2, FIG. 5, and FIG. 6 are schematic plan views showing other embodiments of the vibration preventing device for steel strip according to the present invention. is there. 1 ... Steel strip, 3 ... Wiping nozzle, 5 ... Cart, 6 ... Electromagnet, 8 ... Magnetic plate, 9 ... Steel strip edge detector

Claims (2)

[Claims] 1. A vibration preventing device for a steel strip, wherein electromagnets having polarities different from each other are arranged in close proximity to each other on each side end surface of the steel strip traveling along a steel strip processing line, and the steel strip is equidistant from a reference line for passing the steel strip. While the plate surface is close to the front and back sides of each side end portion of the steel strip to be positioned, the side edges of each of the electromagnets are arranged so that each magnetic plate is arranged in close proximity to each other. Anti-vibration device. 2. A trolley having a bifurcated front half so that each side end of a steel strip running on a steel strip processing line can be loaded so as to be movable in the strip width direction of the steel strip. Provided, on the bifurcated base in the center line of the moving direction of each carriage,
Electromagnets having different polarities are installed in close proximity to each side end face of the steel strip, and the plate faces are close to the front and back sides of each side end of the steel strip equidistant from the steel strip reference line. In addition, each magnetic plate whose side end face is opposed to and close to each electromagnet is provided from each bifurcated portion of each trolley via a non-magnetic bracket, and each trolley detects the side end of the steel strip. An apparatus for preventing vibration of a steel strip in a steel strip processing line, comprising: an edge detector; and a drive means for controlling the position of each of the carriages based on a detection signal from each edge detector.