JPH03297753A - Method and device for controlling zigzagging of beltlike conveyance substance - Google Patents

Abstract

PURPOSE:To control zigzagging of a beltlike conveyance substance with high efficiency, high precision, and high response and to cause the stable passage of the conveyance substance by energizing the beltlike conveyance substance and applying a magnetic field thereon and controlling an electromagnetic force generated through interaction between a current and the magnetic field. CONSTITUTION:Devices 7 and 7b to energize a beltlike conveyance substance 1 under conveyance and a device 6 to apply a magnetic field, crossing a current direction at right angles, in the energizing area are provided. When the beltlike conveyance substance 1 runs in a state to displace from a given position, namely during zigzagging, an electromagnetic force in a direction extending at right angles with a conveyance direction is applied on the beltlike conveyance substance 1 by means of a magnetic field generating device 6 to control zigzagging during running so that the beltlike conveyance substance 1 is not displaced from a given pass area. This method and constitution perform stable conveyance of the beltlike conveyance substance 1.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a non-contact type meandering line that is suitable for use in lines that handle metal strips such as continuous annealing lines, continuous plating lines, bright annealing lines, etc. The present invention relates to a control method and device.

[Prior Art] Conventionally, for meandering control of a belt-shaped conveyed object, a meandering control device using a linear motor has been proposed, for example, as in Japanese Patent Laid-Open No. 60-247253. FIG. 4 shows the configuration of these conventional devices, in which 1 is a metal strip, 2a and 2b are floaters that levitate and support the metal strip 1 by fluid force, 3 is a slit that spouts fluid, 4a and 4b are linear motors.

[Problems to be Solved by the Invention] In all of these conventional techniques, a linear motor applies a magnetic field to a metal strip in a non-contact state, and the eddy current on the surface of the metal strip induced by this magnetic field and the magnetic field are It utilizes the electromagnetic force generated by interaction, and as the thickness of the metal strip becomes thinner, the eddy current induced on the surface of the metal strip becomes smaller, and the generated electromagnetic force itself has a smaller value. I can't wait.

For example, when a stainless steel plate with a thickness of 0.1 mm is used and the gap between the near motor is set to 25 mm, the electromagnetic force generated in the steel plate when 140 kVA of power is applied or the near motor is applied is about 200 g. In order to further increase the electromagnetic force, either increase the power input to the linear motor or further reduce the gap between the steel plate and the near motor. In the latter case, the gap between the steel plate and the near motor becomes smaller, and vibration contact flaws may occur during conveyance of the steel plate, and both pose practical problems.

The present invention solves the above-mentioned drawbacks of the conventional methods, and aims to provide a meandering control method and device with high efficiency and high degree of control.

[Means for Solving the Problems] The present invention has been made by focusing on the drawbacks of the above-mentioned prior art, or the fact that they rely on the electromagnetic force of minute eddy currents. It has a means for energizing the belt-shaped conveyed object and a means for applying a magnetic field perpendicular to the direction of the current within the energized area, and controls the strength and direction of the energized current and/or the strength and direction of the magnetic field. It is characterized by generating an electromagnetic force in the direction perpendicular to the conveyance, thereby controlling the meandering of the conveyed object while it is traveling.

[Function] With the above configuration, when the traveling belt-shaped conveyed object deviates from the predetermined position, that is, when it travels in a meandering manner, electromagnetic force is applied in the direction perpendicular to the conveyance so as to push the belt-shaped conveyed object back to the predetermined position. By generating a force on the belt-shaped conveyed object and controlling meandering during travel so that the belt-shaped conveyed object does not protrude from a predetermined passage area, stable conveyance of the belt-shaped conveyed object becomes possible.

[Example] An example of the present invention is shown in Fig. 1, which is a conceptual diagram of the overall configuration of an example of a device for carrying out the present invention, and Fig. 2, which is a diagram showing the principle of electromagnetic force generation, as well as a magnetic field generating device and a metal band. The explanation will be based on FIG. 3, which is a graph showing the relationship between the gap with the plate and the generated electromagnetic force.

In FIG. 1, 1 is a metal strip, and 5a, 5b, and 5c are metal strip supporting devices. 6 is a magnetic field generating device such as a permanent magnet, and in this figure, it has a structure in which the metal strip plate 1 is sandwiched, but since the magnetic field only needs to pass in the thickness direction of the metal strip plate 1, the metal strip It may be installed only on one side of the board 1. Further, as for the installation position, as long as it is between the energizing devices 7a and 7b, there is no restriction on the installation location, and there is no restriction on the number. Further, in this figure, there are no restrictions on the conveyance line conditions as long as the configuration is applied to a vertical conveyance line or a line that handles metal strips.

Next, the operation will be explained. Current is applied to the running metal strip 1 by the energizing devices 7a and 7b, and a magnetic field is applied to the metal strip 1 by the magnetic field generator 6 in a direction perpendicular to the current direction within the energized area of the metal strip 1. Multiplying (1
) An electromagnetic force is generated in a direction perpendicular to the conveying direction of the metal strip 1 according to Fleming's left-hand rule expressed by the following equation. This force can be adjusted by controlling the strength and direction of the current and/or the strength and direction of the magnetic field, and can be used to control the meandering of the running metal strip l. Note that the directions of current, magnetic field, and electromagnetic force are shown in FIG.

F= (1/9.8) ・5 s (I XB) d
S ・-(1) F: Electromagnetic force (Kg) S: Current・
Magnetic field effective area I: energizing current (A) B: magnetic flux density (T) Furthermore, when this device is applied to a transport system that performs floating transport using a fluid levitation device, transport and meandering control can all be performed non-contact, In addition to being able to produce products with high surface quality,
The electromagnetic force required as the meandering control force is small, the magnetic field generating device and the energizing device can be made small, and the required electric power is also small, making it possible to provide the most effective conveyance system.

Furthermore, - meandering control for boat fishing has means for detecting the displacement of the metal strip 1, and meandering control is performed by determining the control force from this displacement detection signal. A magnetic field is applied to each other within one width so that an electromagnetic force is generated in the direction of the width center of the metal strip 1, and the center-direction electromagnetic force generated by the displacement of the metal strip 1 from the center of the pass line changes. By applying a magnetic field to (for example, increasing the magnetic field and/or increasing the magnetic field area as it deviates from the path line), a self-centripetal meandering control method can be achieved, and a means for detecting displacement of the metal strip. It is possible to construct an inexpensive meandering control system that does not require

Figure 3 shows a graph showing the relationship between the gap between the magnetic field generator 6 and the metal strip 1 and the electromagnetic force generated in the metal strip 1. The electromagnetic force generated by the conventional linear motor type is also shown.

The electromagnetic force generated in the metal strip 1 is almost inversely proportional to the gap between the magnetic field generator 6 and the metal strip 1, but it is possible to obtain an electromagnetic force about 5 times larger than that of the conventional linear motor type. .

[Effects of the Invention] As described above, according to the present invention, an electric current is applied to a belt-shaped conveyed object, for example, a metal band plate, and a magnetic field is applied to control the electromagnetic force generated by the interaction between the current and the magnetic field. By this,
Since the meandering of the moving metal strip can be controlled with high efficiency, high speed, and high response, it is possible to achieve stable threading of the metal strip, and prevent the metal strip from protruding from the permissible conveyance range. Loss due to line stoppages and restorations has been reduced, and high-speed running has been achieved, which is extremely effective in practical terms.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram of the overall configuration of an example of a device according to an embodiment of the metal strip conveying system of the present invention, FIG. 2 is a diagram of the principle of electromagnetic force generation according to the present invention, and FIG. 3 is a diagram of the magnetic field. FIG. 4, a graph showing the relationship between the gap between the generator and the metal strip plate and the generated electromagnetic force, is a configuration diagram of a conventional technique using a linear motor. 1...Metal band plate, 2a, 2b-...Floater, 3...
・Slit, 4a, 4b...Linear motor. 5a, 5
b, 5c... Metal strip support device, 6... Magnetic field generator, 7a, 7b... Current supply device.

Claims (1)

[Scope of Claims] 1. A means for applying current to a belt-shaped conveyed object being transported, and a means for applying a magnetic field perpendicular to the current direction within the current-carrying area, and controlling the strength and direction of the current to be applied, as well as the strength of the magnetic field. A meandering control method for a belt-shaped conveyed object, characterized in that the meandering of a conveyed object is controlled by controlling both or one of the two directions, thereby generating an electromagnetic force in a direction perpendicular to the conveyance direction. 2. The meandering control method for a belt-shaped conveyed object according to claim 1, wherein the meandering force of the conveyed object is controlled by keeping the strength and direction of the magnetic field constant and changing the strength and direction of the applied current. 3. The meandering control method for a belt-shaped conveyed object according to claim 1, wherein the meandering force of the conveyed object is controlled by keeping the strength and direction of the applied current constant and changing the strength and direction of the magnetic field. 4. Apply a magnetic field to generate forces pointing toward the center of each other within the width of the plate, and create a magnetic field so that the center direction changes due to displacement from the center of the pass line of the plate, making it self-centripetal. 2. The method for controlling meandering of a belt-shaped conveyed object according to claim 1, wherein: 5. A meandering control device for a belt-shaped conveyed object, which applies the meandering control according to claim 1 to a conveyance system that carries out floating conveyance using a fluid flotation device. 6. Claim 1 using a permanent magnet as the magnetic field generator
A meandering control device for a belt-shaped conveyed object that performs the described control.