JPS62167826A - Traveling direction changer for metallic belt-like body - Google Patents

Abstract

PURPOSE:To change the traveling direction of a metallic belt-like body by acting the adequate braking power against the own weight and tension to the metallic belt-like body by the 2nd linear moving magnetic field type induction motor while subjecting the metallic belt-like body to feeding driving by the 1st linear moving magnetic field type induction motor and maintaining the metallic belt-like body at a prescribed loop shape in the non-contact state by a magnetic field. CONSTITUTION:This direction changer is constituted of a passage 17 which is bent and provided in a loop shape, the 1st linear moving magnetic field type induction motor 10A which is provided in the inlet part of the passage 17 and generates the moving magnetic field along the traveling direction of the metallic belt-like body 13 traveling in the passage 17 and the 2nd linear moving magnetic field type induction motor 10B which is provided in the outlet part of the passage 17 and generates the moving magnetic field in the direction opposite from the traveling direction of the metallic belt-like body 13 traveling in the passage 17 to maintain the metallic belt-like body 13 at the loop shape by the cooperation with the 1st linear moving magnetic field type induction motor 10A.

Description

[Detailed Description of the Invention] <Industrial Application Field> The uninvented invention is a continuous annealing line, i! This invention relates to a running direction changing device for metal strips used in lines that handle metal strips, such as IU continuous galvanizing lines, stainless steel bright annealing lines, and colored iron plate coating lines.

BACKGROUND ART First, a continuous annealing furnace for cold rolled steel sheets will be described as an example of a line for passing a metal strip.

The strip is edged out from the payoff reel and passed through the cleaning tank and looper.

It is supplied to a continuous annealing furnace shown in FIG. In the furnace shown in the figure, support rolls 2 are arranged in the upper and lower parts.
The strip l is passed between these rolls 2 and meandered in the vertical direction for safe heating and cooling, so that it has material properties such as predetermined high tensile strength and good deep drawability at room temperature. Granted. More specifically, in order to prevent surface oxidation of the strip l, the furnace is filled with reducing HN gas, and the strip l is usually heated at a temperature of 850''C to 850'O.
It is heated in a heating zone to 9 degrees (approximately 1050 degrees Celsius to 1150 degrees Celsius in the case of SUS) by a heating means such as a radiator tube 3 or an electric heater, then soaked for several tens of seconds, and rapidly cooled to, for example, about 400 degrees Celsius. , undergoes an over-aging treatment for about 2 minutes, and finally is rapidly cooled to room temperature, or is cooled from a high temperature without any over-aging treatment.

By the way, in the above-mentioned continuous annealing furnace, in places where the strip temperature is high such as the heating zone, the high temperature strip l
and the support roll 2, which is slightly colder than that, come into contact with each other, resulting in deformation of the strip due to non-uniform cooling in the width direction of the strip l, and strip deformation due to contact with the non-uniform roll surface to which carbon, etc. in the rolling oil has adhered. The problem is the occurrence of scratches on the surface.

In addition, since the strip 1 meanderes by being passed up and down between the support rolls 2, a considerable amount of tension is applied to the strip 1 due to its own weight, which causes scratches and wrinkles due to the strip between it and the support roll 2. , creep, and other undesirable phenomena may occur.

<Problems to be Solved by the Invention> Due to the above-mentioned problems, there is a demand for changing the running direction of the hot strip 1 without contacting it with the support roll 2, and in order to meet this demand, static pressure or dynamic pressure of gas is used. Attempts have been made to float and support the strip using gas pressure using a so-called pengu floater, and at the same time to change the running direction of the strip. In other words, the pengu floater has a slit extending in the width direction of the strip as a gas outlet, and has an arc-shaped pressure receiving surface facing the strip, and the floating gas is flowed from the slit between the strip and the pressure receiving surface. The strip is buoyed and supported by the gas pressure, and its traveling direction is changed into a loop shape.

However, if the thickness of the strip is thick, the tension generated in the strip bent into a loop will increase, so it is necessary to supply a large amount of levitation gas to support this tension. In some cases, this may lead to an increase in the size of the fan that supplies the power, and an increase in operating costs.

The present invention has been made in view of the above-mentioned conventional circumstances, and an object of the present invention is to provide a device for changing the running direction of a metal strip using a non-contact method.

Means for Solving the Problems The device for changing the running direction of a metal strip according to the present invention has a loop-shaped, sunken passageway, and is provided at the entrance of the passageway and runs along the passageway. A first linearly moving magnetic field type induction motor that generates a moving magnetic field along the running direction of the metal (i7) shaped body, and a first linear moving magnetic field type induction motor that generates a moving magnetic field along the running direction of the metal (i7) shaped body, and a first linear moving magnetic field type induction motor that is provided at the exit portion of the 11i passage and opposite to the running direction of the metal strip shaped body that runs in the passage. Generating a magnetic field moving in the direction and maintaining the metal strip in a loop shape by cooperation with the first linear moving f magnetic field type induction motor: 5
The present invention is characterized in that it is equipped with two linear moving magnetic field type induction motors.

Function> While the first linearly moving magnetic field type induction motor drives the metal strip, the second linearly moving magnetic field type induction motor provides an appropriate braking force to resist the weight and tension of the metal strip. The magnetic field is applied to the metal strip to maintain the metal strip in a predetermined loop shape in a non-contact state.

Embodiment An embodiment of the present invention applied to a bright annealing furnace for stainless thin strips will be described with reference to FIGS. 1 to 6.

First, a linear moving magnetic field type induction motor (hereinafter referred to as a linear motor) will be explained. The linear motor lO is the second
As shown in the figure and FIG. 3, there is a yoke 2 made of a magnetic metal material having several teeth 12a, and a plurality of yoke 2 wound around the teeth 12a and connected to an AC power source (not shown). It is composed of a coil 11.

The driving principle of the linear motor 10 is not particularly different from those conventionally known, and there are various driving methods depending on the number of current phases and the number of poles (number of N and S poles), but there are no particular limitations. Here, Rj
t.

also describes a typical two-pole three-phase system. In FIGS. 3 and 4, A, B, and C in the drawings indicate coils 11 corresponding to three phases, respectively.

The coils 11 of A', B', and C' are A, B, and C', respectively.
It is wound around the yoke 12 in the opposite direction to the coil 11 of C.

A current IA whose phase is shifted by 2/3π is applied to the coils 11 of A, B, C, A', B', and C'.

When currents are applied to IB, I, IA', IB', and I, a magnetic field proportional to the current is generated in the teeth 12a around which the respective coils 11 are wound.

IA, rA'=I. sin θ The solid line in Figure 4 shows the graph above the yoke 12 (Y
It represents the X-direction intensity component of the magnetic field generated at the position (direction), and is for the case where the current phase is 0=O. The shape of this magnetic field is N-pole because the linear motor 10 has two poles.

Since one south pole is generated, the shape is essentially a sine wave, and when the above current phase θ changes from 0 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).

In addition, the graph shown by the dotted line in Figure 4 is current phase 0 = 2/3π
This is the case. The magnetic field generated above the yoke 12 and moving in a straight line exerts the following force on the conductor placed above the yoke 12. In other words, when the moving magnetic field crosses the conductor, the max. An eddy current is generated inside the conductor according to the law of the induced magnetic field of the well, and the so-called Lorentz force is generated in the same direction as the moving direction of the moving magnetic field due to the interaction of this eddy current and the magnetic field.

Next, a device for changing the running direction of the stainless steel thin strip plate 13 (hereinafter referred to as a strip) using the linear motor IO will be described. As shown in FIG. 1, a heating zone 15 that performs bright heat treatment divided into a vertical bright annealing furnace body 14 is heated with high temperature (approximately 1200°C) NH and decomposed gas containing H2 near 5% volL N2: 25 vol. The atmosphere is a reducing gas having a $ composition, and the cooling zone 16 provided downstream of the heating zone 15 has an atmosphere containing a reducing gas having the same composition as the above at a low temperature (270° C. to 300° C.). Note that the atmosphere in other parts of the furnace body 14 is a protective gas having the same composition as the above at 100 to 150° C., and prevents outside air from entering the furnace body 14. The strip 13 subjected to the bright heat treatment in this master annealing furnace has a thickness of about 0.8 mm to 2III11 on the wood grain side, but is not particularly limited thereto.

A loop-shaped passage 17 is provided in hti of the heating belt work 5, and a pair of linear motors 10A and IQB are sunk in the entrance and exit of this passage 17, respectively. ing. Note that the strip 13 travels in a loop shape within the passage 17, and the loop shape referred to here refers to a substantially arcuate curved surface portion that is created when the strip 13 is curved, and has a diameter of 180'''. Any angle within

The first linear motor IO provided at the entrance of the passage 17
A generates a moving magnetic field along the running direction of the strip 13 and provides a feeding driving force to the strip 13. On the other hand, a second linear motor IOB provided at the outlet of the first passage 17 generates a moving magnetic field in a direction opposite to the running direction of the strip 13, and applies a predetermined braking force to the strip 13. That is, the strip 13 is a linear motor IOA.

108, it is maintained in a predetermined loop shape against its own weight and tension, and travels within one passage 17 with its traveling direction changed.These linear motors IOA and IOB control their respective 'rV flows or frequencies. 1Jll L power supply (
The output signal of a known distance sensor 18 is connected to a control circuit (not shown) and detects the shape of the loop from the distance to the top of the loop of the strip 13 bent into a loop shape.
(not shown) adjusts the current or frequency supplied to the linear motors IOA and IOB to control the feed driving force and braking force acting on the strip 13.
JmL, maintaining the looped shape of the strip 13 in place.

In this embodiment, a pair of beam near motors 10A and IOB are provided with the strip 13 in between, but depending on the circumstances, it may be sufficient to provide each pair only on one side, or along the running direction of the strip 13. In some cases, multiple units may be provided.

In FIG. 1, reference numeral 20 denotes a pneumatic flotation device (floater) for sheet threading, which is disposed oppositely to the inlet and outlet portions of the passage 17 with the strip 13 interposed therebetween.
The strip 13 is buoyantly supported by the levitation gas pressure ejected from 0. That is, the running direction of the strip 13 is determined by the balance of gas pressure generated on both sides of the strip 13.
(7) m Touch to linear motor IOA, 10B is prevented. In addition, the floater 20 and the linear motor IOA,
It may be integrated with IOB, for example, linear motor I
The OA and IOB may be stored in the center of the floater 20, and the present invention does not preclude the use of a guide roll in place of the floater 20.

Further, in FIG. 1, IOC is a linear motor for autosteering that limits the deflection of the strip 13 in the width direction, and a pair of IOCs are provided at the entrance and exit of the passage 17, respectively. That is, as shown in FIGS. 5 and 6, the linear motors ioc and toc are arranged symmetrically with respect to the center line M (passing direction) of the strip 13, which is a conductor, and with a gap corresponding to the strip 13. These linear motors toc,
The moving magnetic fields generated at the IOc are set to have the same strength, and the moving directions thereof are set to be opposite to each other from the width direction of the strip 13, as shown by the arrows in FIG. Therefore, as shown in FIGS. 5 and 6, the strip 13 at the normal threading position where the center line M is in the center between the linear motors IOC: and 100 is affected by the moving magnetic fields of the linear motors 10C and IOC, respectively. Forces f and f caused by the above act on the strip 13 from the width direction thereof, and are opposite to each other and have the same magnitude.

In this way, when the strip 13 is running at the normal passing position (pass line), the forces f and f acting on the strip 13 cancel each other out and do not move the strip 13 in the width direction. On the other hand, if the strip 13 moves in the width direction (meandering) for some reason, the area of the strip 13 covered by the linear motors IOC and IOc changes, that is, the area of the strip 13 covered by the linear motor in the direction of movement changes. The area increases and the opposite side decreases. The forces f and f acting on the strip 13 are linear motors IOc and IOc covering the strip 13.
Since the strip 13 increases or decreases in proportion to the area of the strip 13, the strip 13 automatically returns to the normal threading position without any artificial control. In addition to the above-mentioned autosteering device using a near motor, a known steering device can also be used as appropriate.

In addition, in FIG. 1, 21 is a guide roll for the strip 7p 13, which is used only when starting to pass the sheet into the passage 17;
22 is a deflector roll that guides the strip 13 into and out of the bright annealing furnace.

In the above configuration, the strip 13 introduced into the bright annealing furnace body 14 through the deflector roll 22 at a line speed of about 30 m/win passes directly above the inside of the furnace body 14 and passes through the passage 1.
At 7, the direction of travel is changed by the cooperation of the linear motors 10A and 10B, and the motor moves downward, within the heating zone I5!150
After being heated to around °C and undergoing prescribed heat treatment, cooling,
1i) It is cooled to a predetermined temperature at 18, and the bright annealing process is completed. In such a process, the running direction of the strip 13 is changed in a completely non-contact state instead of using a crowned rubber roll as used in conventional equipment, so there is no possibility of vertical wrinkles occurring due to contact between the strip 13 and the rubber roll. The occurrence of scratches is prevented.

Although an embodiment has been shown in which the running direction is changed by 180° in a bright annealing furnace for a stainless steel thin strip plate, the present invention can also be used for changing the running direction to any angular direction such as 90° or 120°, or for various other processes. It can also be applied to lines.

Furthermore, although the above embodiments show an example in which the metal strip meanders in the vertical direction, the present invention can also be applied to a pass line in which the metal strip meanders in the horizontal direction. Furthermore, the present invention is not limited to the above-described embodiments, and various design changes may be made without departing from the spirit of the present invention.

<Effects of the Invention> According to the present invention, the running direction of the metal strip can be changed in a non-contact manner without increasing the size of the equipment, and the occurrence of scratches, wrinkle stretching, and creep can be prevented. This allows us to maintain good product quality.

[Brief explanation of drawings]

1 to 6 relate to one embodiment of the present invention. Fig. 1 shows the entire 5tir diagram of the running direction conversion device, Fig. 2 is a plan view of the beam near motor, Fig. 3 is a cross-sectional view taken along the arrow ■-m in Fig. 2, and Fig. 4 is an explanatory diagram of the operation of the beam near motor. Figure 5 is a plan view of the linear motor for autosteering, Figure 6
The figure is a sectional view taken along the line ■--■ in FIG. 5, and FIG. 7 is a schematic diagram of the continuous annealing furnace. In the drawing, +OA, 10B beam near motor. ■3 is strip. 17 is a passage.

Claims (1)

[Claims] A passage curved in a loop shape, and a first linear movement that generates a moving magnetic field along the running direction of a metal strip provided at the entrance of the passage and running in the passage. A magnetic field type induction motor is provided at the outlet of the passage and generates a moving magnetic field in a direction opposite to the traveling direction of the metal strip running in the passage, thereby cooperating with the first linearly moving magnetic field type induction motor. 1. A running direction changing device for a metal strip, comprising: a second linearly moving magnetic field type induction motor that maintains the metal strip in a loop shape by operating the metal strip.