JPS6312555A - Steering system for conveying metal plate - Google Patents

Abstract

PURPOSE:To prevent any flaws to a metal plate surface and its deformation from occurring, by installing each linear motor being set up at regular intervals to the metal plate surface to be conveyed, capable of impressing as moving a magnetic field in a width direction of the metal plate, and capable of impressing an intense magnetic field in corresponding to a positional slippage of the width direction. CONSTITUTION:Linear motors 10a and 10b are set up in the underside or the upside of a metal plate 1 to be conveyed as being supported by a lot of supporting devices. If so, an intense magnetic field according to slippage is impressed on a slip in a width direction of the metal plate 1, so that it is adjusted so as to be automatically reset to the set central position and to travel all the time. Therefore, it is stably supported and travelable without entailing any flaws to a surface of the metal plate and its deformation.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application> The present invention relates to a steering device in a metal plate conveyance line such as a continuous sintering line, continuous galvanizing line, continuous pickling line, etc.

<Prior art> For example, in steel works, etc., lines for conveying steel plates can be roughly divided into lines that convey thick plates of 3 mm or more or hot-rolled steel strips at low speed for rolling, heating, and cooling; m
There is a line that transports thin plates such as cold-rolled steel strips with a thickness of approximately 1.5 m in diameter at high speed, and performs cutting, winding, heating and cooling, and surface treatment.

By the way, in a line for conveying such steel plates, the steel plates are generally conveyed while being supported from below by rolls. Depending on the line, these rolls may be provided only below the steel plate to be conveyed, or they may be provided on both the top and bottom sides. In such a conveyance line, the position adjustment in the width direction of the steel plate to be conveyed (hereinafter referred to as "steering") is conventionally performed using a steering wheel called a displacement guide as shown in FIG. 7 (5). It was done by a device. FIG. 7 shows only the schematic structure, and the conveyed strip 1 is placed on an entry roll (entry-roll).
l) The running direction is changed in two directions by means of 20, and is changed downward through two rollers 22 fixedly provided on a frame 21, and an exit roll (exit-r
oll) 2 It is supposed to go out from g. This allows the frame to be slightly swung about a fixed pivot point P, and by slightly changing the position of the rollers on the frame on the exit side, the traveling displacement of the wound strip is controlled. I'm trying to change it.

<The invention has solved the problems that are still bothering us.> However, since the above-mentioned conventional steering device for conveying metal plates (31) uses a method of bringing the metal plate into contact with the 17-ru to change the running position of the center of the plate. ■ The surface of the board may be damaged by contact with the II-ru, or the board may be deformed when correcting a large deviation in the width direction.

During heating or cooling of the metal plate, temperature unevenness occurs in the metal plate due to contact unevenness depending on the degree of contact with the roll.

θ Further, when the surface of the strip is subjected to electrolytic cleaning or pickling, there is a drawback that the contact portion with the roll is effective and cannot be used as a leaning section or a pickling section.

The present invention aims to provide a steering device for a conveyed metal plate that eliminates the above-mentioned drawbacks of conventional steering devices for metal plates.

Means for Solving the Problems〉 To achieve the above-mentioned object, the conveying metal plate steering device of the present invention has a plurality of supporting devices arranged along the conveying direction of the metal plate. The device is placed at a fixed distance from the surface of the metal plate to be transported, and can apply a magnetic field while moving it in the width direction of the metal plate to be transported, as well as apply a magnetic field with an intensity that corresponds to the amount of positional deviation in the width direction of the metal plate. There is a device characterized by comprising a linear moving magnetic field type induction motor capable of applying a magnetic field of .

−3 = Effect> In this way, a linear moving magnetic field type induction motor is placed below or above a metal plate that is supported and conveyed by a large number of support devices, and the linear movement magnetic field type induction motor is placed below or above the metal plate that is being conveyed while being supported by a large number of supporting devices. On the other hand, the strength depends on the amount of deviation! Since the li field is applied, it is adjusted so that it always returns to the set center position automatically and travels, so there is no damage or deformation to the metal plate surface, and the metal plate is stably supported and travels. You can do it.

<Embodiments> Next, typical embodiments of the invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing the overall arrangement of the steering device for conveying metal plates according to the present invention, and FIG. Figure 3 (5) and (2) are the magnetic field strength distribution diagram and cross-sectional structure diagram in the width direction of the linear moving magnetic field type induction motor shown in Figure 2, and Figure 4 (AJ@ FIG. 1 is a schematic configuration diagram of the device seen from above and in the lateral direction. FIG. 5 is a graph showing the relationship between current and deviation amount in the device of the first embodiment. FIG.
1(B) is a diagram showing the configuration of a second embodiment of the present invention and a graph showing the relationship between excitation current and deviation amount.

In FIG. 1, a conceptual diagram of a linearly moving magnetic field type induction motor 10 installed between rolls 5A and 5B is shown. Reference numeral 1 is a metal plate or metal strip (hereinafter referred to as a "metal plate").

10 is a linear moving magnetic field type induction motor (hereinafter referred to as a linear motor) installed with a certain gap from the metal plate 1, and in this figure, it is placed between two curved wheels 5A and 5B. However, there is no particular restriction on the installation location, and it may be installed anywhere.

In Fig. 2 (5), @ shows the linear motor 10, which is made of a magnetic metal material, includes a yoke 12 having several teeth, and a plurality of coils 1 wound around the teeth.
It is composed of 1. Figure 3 shows this linear motor.

It shows the characteristics of magnetic field strength at . Note that an alternating current power source for passing current through the coil 11 is connected to the linear motor 0, but this will not be described here. linear motor 0
The driving principle is well known in the past, and there is no particular difference in the present invention.1 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 explanation will be based on the most typical two-pole three-phase system. Figure 2 (5).

) and Figure 3, F, G, and H in Figure 101 indicate the coils 11 corresponding to each of the three phases, and F-2,
The coils 11 of G-2 and H-2 represent the coils 11 wound around the mesh 12 in the opposite direction to the coils 11 of F, G and II.

Now, it is assumed that the following currents are passed through the coils 11 of F, G, II and F-2, G-2°H-2, respectively, with a phase shift of 120 degrees (-π).

t,,I,' = 1o61116
(1) Then, a magnetic field proportional to the current is generated in the yoke 12 around which each coil 11 is wound. The graph indicated by the solid line J in FIG. 3 shows the intensity component in the X direction of the magnetic field generated at the position above the yoke 12 in the Y direction, and is for the case where the current phase is θ-0. Now, since the linear motor 10 has two poles, the shape of the magnetic field is approximately a sine wave with one north pole and one south pole. The above current phase θ is 0 to 36 in a certain period.
It changes up to 0 degrees (2π), but the sine wave of the magnetic field also moves along with the change. The direction of movement is the same as the direction in which the phase advances, in this case the X direction. In the figure, the dotted line indicated by - indicates the case where θ is approximately 120 degrees. The period of this phase depends on the frequency of the applied current, but the most common frequency is 1160 hertz (60 times per second).

As described above, the linear motor 10 generates a magnetic field that moves linearly above the yoke 12. When a conductor is placed above the yoke 12 of the linear motor 10, force is generated in the conductor by the following mechanism. That is, when a moving magnetic field crosses a conductor, eddy currents are generated inside the conductor according to Maxwell's law of induced magnetic fields. This eddy current and magnetic field act to generate a so-called Lorentz force.

The direction of the force is the same as the direction of movement of the moving magnetic field.

Now, as in the first embodiment shown in FIG. 4, a linear motor is placed below (or above, or both of) the metal plate 1, which is a strip-shaped body, with a certain gap. In the first embodiment, two linear motors IOA and IOB are arranged so that their M points face outward in the width direction of the metal plate 1 in the direction of movement of their moving magnetic fields. Arrangement position -8 = The relationship is approximately symmetrical with respect to the positioning line of the metal plate 1 (center line in the figure).

In this case, a force f due to the moving magnetic field is generated in the metal plate 1 according to the principle described above.

That is, a force f in the same direction as the direction of the moving magnetic field, that is, an outward force, acts on the metal plate 1 on the linear motor IOA, and a force fb, which is directed opposite to f8, acts on the linear motor 10B. acts.

Now, when the metal plate 1 is running along the positioning line, the magnitudes of f and f are equal and the directions are opposite, so the metal plate 1 as a whole is canceled, and especially the metal plate 1 will not be moved. However, if the metal plate 1 were to move (meander) in the width direction for some reason, the linear motors IOA and IO
The area of the metal plate 1 covered by B changes. That is,
The area covered by the near motor increases in the direction of movement,
The opposite direction decreases. Since the force f generated by the metal plate 1 is proportional to the area covered by the linear motor, for example, if the moving direction is the direction of the linear motor IOA, then f, > f
, and if this continues, the displacement of the metal plate 1 will be further amplified. Now, a sensor 13 is installed near the left and right edges of the metal plate 1 to detect the deviation of the metal plate 1, and the intensity of the moving magnetic field is made variable according to the amount of deviation.

FIG. 5 shows the amount of deviation and the strength of the moving magnetic field, that is, the equations (1) to (3) described above are calculated. A graph is shown without showing any relationship between Io and Io. If the deviation amount δ is zero, 2 of 10A and IOB
The currents flowing through the near motor are equal, and f and fb written in - are also equal, and the forces are canceled. If the metal plate 1 is shifted by δ to the a side, the linear motor I
Exciting current 5 should flow through OH, and exciting current 5 should flow through linear motor IOA. In that case, ■, 〉■, to f,
> f, and the force Δ to restore the metal plate 1 to the set position is
f=f, , -f, and the metal plate 1 is quickly restored to the set position. Of course, here, the relationship between the amount of deviation δ and the excitation current I is such that a force that sufficiently exceeds the left-right force f, -f (force that increases unbalance) generated in proportion to the above-mentioned deviation is generated. You need to set it to do so.

As described above, by detecting the amount of deviation of the metal plate and controlling the excitation current of the linear motor in proportion to the deviation 1, the metal plate can always be steered to the set traveling position.

Although FIG. 4 shows an example in which two linear motors are used, it is of course possible to perform the same steering function with one linear motor. An example of this is shown in Figure 6 (5).

Shown in (f). In this case, the moving magnetic field directions P and Q are as shown in the figure, and since it is necessary to change the moving direction of the magnetic field according to the direction of deviation, the device becomes a little Weft.

On the other hand, in the example shown in FIG. 4, the moving direction of the magnetic field does not change, and only the excitation current value changes, so the apparatus is simpler.

Although this embodiment shows the case where the metal plate is running horizontally, it is not particularly necessary to limit it to horizontal, and the present invention can also be used when the metal plate is running vertically.

<Effects of the Invention> As is clear from the above description, according to the steering device for conveying metal plates of the present invention, (1) Stable sheet threading is possible.

■ No scratches on the board. .

■ No plate deformation.

■ Line conveyance speed can be increased.

■ Fast response because it is an electrical method.

■ Easy maintenance.

■ It has the advantage of requiring less installation space.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the overall arrangement of the steering device for conveying metal plates according to the present invention, and FIG. 2 (5) σ3
) are a sectional view and a plan view respectively showing the structure of a linear moving magnetic field type induction motor used in the steering device for conveying metal plates of the present invention, and the third opening (Fl) is a linear moving magnetic field type induction motor shown in Fig. 2. Fig. 4 + At (81 is a schematic configuration diagram of the device of Fig. 1 seen from above and from the side, Fig. 5 is a diagram of the device of the first embodiment) Graph showing the relationship between current and amount of deviation,
FIG. 6 (5) β) is a block diagram of the second embodiment of the present invention and a graph showing the relationship between excitation current and deviation amount, and FIG. 7 (A)
ff31 is a plan view of a main part and a side view of a main part of a conventional steering device for conveying metal plates, respectively. In the drawings, 1 is a metal plate or strip, 5A and 5B are rolls, 10 is IOA, IOB beam near motor, 11 is a coil, 12 is a yoke, and 13 is a sensor.ノ □ Zuzu 3δ
□(C compensation gono Fig. 6 Fig. 6 deviation amount δ

Claims (1)

[Claims] In a steering device for a conveyed metal plate, which has a plurality of support devices arranged along the conveyance direction of the metal plate, the steering device is arranged at a constant interval from the surface of the metal plate to be conveyed, and applies a magnetic field in the width direction of the metal plate to be conveyed. 1. A steering device for a conveyed metal plate, comprising a linearly moving magnetic field type induction motor that can apply a magnetic field while moving the metal plate and apply a magnetic field with an intensity corresponding to the amount of positional deviation in the width direction of the metal plate.