JPS62161926A - Floating type sheet passing device - Google Patents

Abstract

PURPOSE:To reduce the length of a furnace by providing a device to change a sheet passing direction while floating and supporting a metallic belt-like body by a gaseous pressure and liner moving magnetic field induction motors and automatically subjecting the above-mentioned belt-like body to self- alignment. CONSTITUTION:This floating sheet passing device is formed of a gas floating and supporting device to change the direction of the metallic belt-like body 1 to be passed therethrough while floating and supporting said body by the gaseous pressure and a pair of the liner moving magnetic field induction motors 10A, 10B. The device 14 has an arc-shaped pressure receiving surface 14a facing the belt-like body 1 and has a gas ejection port 19 between the disposed symmetrically with the passing direction of the belt-like body 1 and generate the moving magnetic field in the directions facing each other.

Description

[Detailed description of the invention] Industrial application field> The present invention relates to a floating plate threading device used in a line that handles metal strips, such as a continuous annealing line, a continuous galvanizing line, a stainless steel annealing line, and a colored iron plate coating line. .

First, a continuous annealing furnace for cold-rolled steel sheets will be explained as an example of a line for passing metal strips (IJ) through the plate.

The strip fed from the payoff reel and passed through the cleaning tank and roots # is supplied to the continuous annealing furnace shown in FIG. In the furnace shown in the figure, rolls 2 are arranged in the upper and lower parts, and the strip 1 is heated and cooled while running vertically between the rolls 2, so that it remains at room temperature. In this case, certain material properties such as high tensile strength and good deep drawability are given. More specifically, in order to prevent surface oxidation of the strip 10, there is a reducing agent in the furnace.
(The strip is filled with N gas and heated to 650 IC~
It is heated to about 850°C in the Toguchi tropics by the ragant tube 3, then soaked for several tens of seconds, further rapidly cooled to about 400°C, subjected to over-aging treatment at about 400°C for about 29j, and finally By the way, in the above-mentioned continuous annealing furnace, at the outlet of the heating zone, the hot strip 1 and the slightly cold roll 2 are separated.
This may cause deformation of the strip due to non-uniform cooling in the width direction of the strip l, or occurrence of flaws on the strip surface due to contact with the non-uniform roll surface to which carbon, etc. in the rolling oil has adhered. It becomes a problem.

Due to the above problem, in order to run the high temperature strip 1 without contacting the roll 2, a 70-meter (gas flotation support device) 4 is installed in the furnace as shown in FIG.
In the case of a vertical matrix system in which strips are threaded horizontally, an attempt has been made to arrange strips on both sides of the strip l to float the strips and run them horizontally or vertically. In Fig. 8, the metal strip l runs from left to right in the figure, 3 is a radiant tube installed on the upper and lower surfaces of strip 5, and 4 is a radiant tube installed between the strip and the HNN gas -V. A floater generates pressure and supports the entire weight of the strip, 5 is a gas duct for supplying the floater 4, 6 is a furnace wall, and the floater 4 has a cross-sectional structure fr shown in FIG. 9, and communicates with the gas duct 5. The floater 4 has a flat pressure receiving surface 4al facing the strip 1, and a slit 9 at the HN gas ejection port.
The flow direction of the HN gas ejected from the slit 9 is abruptly changed, and pressure is generated between the pressure receiving surface 4a and the strip 1 due to the change in the flow direction.

<Problems to be Solved by the Invention> As mentioned above, in order to eliminate the adverse effects caused by the heating temperature of the high-temperature strip, in the case of the horizontal groove method, the structure shown in figure #g8 in which the floaters are arranged in the horizontal direction is adopted. However, in the floater shown in Fig. 8, although a force is generated in the vertical direction (in the direction of gravity) of the strip 1, no force is generated in the width direction of the strip. It is not possible to return to the 9th line, that is, there is no centering function. Therefore, if the strip moves out while it is being fed, there is a high possibility that the strip will come into contact with the furnace wall, resulting in the need for a centering function.

The above-mentioned phenomenon may similarly occur in the vertical ξ path method, which requires some kind of pair bundle. In the conventional method of changing the threading direction using support rolls, the threading direction of the suspended strip was automatically aligned using crowned support rolls. There was no alternative.

In view of the above problems, the present invention aims to provide a floating plate threading device having a centering function.

<Means for resolving intermittent voltage points> The floating plate threading device of the present invention has an arcuate pressure receiving surface facing the metal strip to be threaded, and a pressure receiving surface between the strip and the pressure receiving surface. a gas flotation support device having a spout metal that spouts gas, and changing the threading direction of the strip-shaped body into a loop shape while floating and supporting the strip-shaped body using the gas pressure; The present invention is characterized in that it includes a pair of linearly moving magnetic field type induction motors that generate moving magnetic fields in mutually opposing directions.

<Function> When metal strips are threaded along a regular /4 line, the strips receive forces of equal magnitude and opposite to each other due to the moving magnetic field, and maintain this pass line. . On the other hand, if the strip deviates from the normal pass line,
The force acting from the direction in which the band-shaped body deviates becomes larger than the other force, pushing the band-shaped body back to the side opposite to the deviation and returning to the normal path line.

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 to 6. Incidentally, the same parts as the conventional ones are given the same reference numerals.

As shown in FIG. 1, the floating plate threading device according to the present invention is
a gas levitation support device consisting of a floater 14 for levitating and supporting the strip 1 on gold while changing its threading direction;
At the inlet of the floater 14, a pair of straight lvJ! Moving magnetic field type induction TIi motive (
IOA (hereinafter referred to as linear motor).

10B.

The floater 14 has a suction 19 extending in the bias direction of the metal strip 1 as a gas ejection port, and has an arcuate pressure receiving surface 14a facing the metal strip 7'l. A levitation gas such as gas is passed through the slit 19 to the metal strip l and the pressure receiving surface 14 &
The multi-metal strip l is buoyed and supported by this gas pressure, and its threading direction is changed in a rogue shape.

As shown in FIGS. 2 and 3, the linear motors IOA and IOB both have a yoke 12 made of a magnetic metal material and has several teeth 12a, and an alternating current (not shown) wound around the teeth tZa. The linear motor IOA is composed of a plurality of coils 11 connected to a power source.

JOB generates moving magnetic fields of equal magnitude in mutually opposing directions.

The driving principles of these linear motors IOA and IOH are not particularly different from those known in the past, and there are various driving methods depending on the number of current phases and the number of poles (number of N and S poles). , it is not limited to any particular method. Here, the most typical two-pole three-phase system will be explained.

In FIGS. 3 and 4, A, B, and C in the drawings indicate coils 11 corresponding to three phases, respectively, and x, B', and C.
The coils 11 are wound around the yoke 12 in the opposite direction to the coils 11 A, B, and C, respectively. These A and B.

The coils 11 of c, A', B', and c' each have t m I,, I, , I whose phase is shifted by 2/3π.
, , IA/, r, r, ■ When CF flows, a magnetic field proportional to the airflow is generated in the toothed portion 12a around which each coil 11 is wound.

+ IB' = koIdn (θ to π) Ic
! Ic' =, Io'' (σ-, r) The graph shown by the solid line in Figure 4 represents the X-direction intensity component of the magnetic field generated above the yoke 12 (in the Y-direction). This is for the case of θ-0.The shape of this magnetic field is N pole, since the number of poles of linear motors OA and JOB is 2&.
Since S# is generated one by one, the shape is essentially a sine wave, and when the above current phase θ changes from O to 2π in a certain period, the phase of the sine wave of the magnetic field advances in accordance with the change. It moves in the direction it is going (X direction in Figure 4). still,
@4 The graph shown by the dotted line in the figure is for the case where the current phase is θ22/3π. The magnetic field generated above the yoke 12 and moving linearly exerts the following force on the conductor disposed above the yoke 12. Namely.

When a moving magnetic field cuts a conductor, a vortex flow is generated inside the conductor according to Maxwell's law of induced magnetic field, and this vortex [a so-called vortex] flows in the same direction as the moving magnetic field due to the interaction between the flow and the magnetic field. Lorentz force is generated.

The linear motors IOA and JOB are disposed symmetrically with respect to the center line M (threading direction) of the metal strip l, which is an electrical conductor, and with a gap below the metal strip l, and These linear motors IOA, IOB
The strength of the shifting a171i field generated in each of the strips is clear, and the moving directions thereof are set to be opposite to each other from the width direction of the strip l, as shown by the arrows in FIG. Therefore, as shown in FIGS. 5 and 6, the center! M is located at the normal threading position where M is the center between the linear motors 10A and 10B) The IJ tube l has the force 'A + due to the S dynamic field of the respective linear motors IOA and IOB.
'B + is the same) They are opposed to each other from the width direction of the IJ tag 1 and act with equal thickness.

In this way, when the metal strip 7"1 is running along the regular pass line, the forces fA+fB acting on the strip 1 cancel each other out and cause this strip IJ strip lt-to move in the width direction. On the other hand, if the IJ lubricant moves (meanders) in the width direction for some reason, the linear motor IOA.

The area of the strip l covered by 10B changes, ie, the area covered by the near motor increases on the side in the direction opposite to FL, and decreases on the opposite side to FL. Kim W Su)
The force 'A + 'B acting on the IJ knob l increases or decreases in proportion to the area of the strip 1 covered by the linear motors IOA and IOB, so for example, when the strip l moves towards the linear motor IOA side, fA>fn.
Therefore, a force of Δf=f person-fB acts on the strip l in the opposite direction to its moving direction. Therefore, the metal strip l is automatically returned to the normal threading position by the force Δf without any artificial control. In addition, this restoring force depends on the IJ Tsupue's board position, running speed, etc.
I need to adjust it, but this is added to the linear motor.
This can be easily implemented depending on the size and frequency of i, the size of the linear motor, etc.The number of pairs of linear motors t to be provided is determined as appropriate, and the installation position of the linear motor is only below the strip l. Instead, it can be freely set as appropriate, such as upward, or both upward and downward. Furthermore, in the above embodiment, the linear motor is arranged on the inlet side of the 70-tor 14, but it may be arranged on the outlet side of the 70-tor 140. Alternatively, the IJ tube 1 may be arranged in a region where the IJ tube 1 is threaded in a loop. Further, it can be disposed opposite to the upper part of the 70-tar or incorporated into the 70-tar 14.

<Effects of the Invention> According to the floating type threading device of the present invention, at the threading direction change position, the metal strip that is threaded while being floated and supported by the gas levitation support device can be automatically aligned. Therefore, the entire strip passing through the furnace can be stably moved at a predetermined position at all times. Therefore.

When the present invention is applied to continuous annealing, it is possible to shorten the furnace length, especially the overaging zone, which has traditionally been desired to be shortened, without any problems, thereby shortening the furnace manufacturing period and reducing construction costs. can be achieved.

[Brief explanation of drawings]

Figures 1 to 6 relate to one embodiment of the present invention, Figure 1 is a perspective view of a floating plate threading device, Figure 2 is a plan view of a company linear motor, and Figure 3 is an I in Figure 2. Cross-sectional view of IJ
An explanatory diagram of the operation of the near motor, Figure 5 is a plan view of the IJ near motor part of the floating plate threading device, and Figure 6 is the v in Figure 5.
7 is a schematic configuration diagram of a continuous annealing furnace, FIG. 8 is a sectional view of an overaging zone, and FIG. 9 is a sectional view of a floater. In the drawing, 1 is a metal strip, 14 is a 70-meter, 14a is a pressure receiving part, and 10A is an IOB beam near motor. 19 is the slit, and M is the center line of the metal strip.

Claims (1)

[Claims] It has an arcuate pressure-receiving surface facing the metal strip being passed through, and has a jetting port for ejecting gas between the strip and the pressure-receiving surface, while floating and supporting the strip by the gas pressure. a gas levitation support device that changes the threading direction of the strip into a loop shape; and a pair of linearly moving magnetic field types that are arranged symmetrically with respect to the threading direction of the strip and generate moving magnetic fields in mutually opposing directions. A floating plate threading device characterized by being equipped with an induction motor.