JPS61178328A - Magnetic levitation apparatus - Google Patents

Abstract

PURPOSE:To levitate stably a low rigidity material by disposing a pair of mag netic field applying means for exerting magnetic force only in the longitudinal direction of a substance. CONSTITUTION:A sheet 10 is held at a predetermined position by the use of a fork lift such that the end faces of the sheet are opposed to the magnetic field emitting surfaces of electromagnets 11a, 11b and one end face contacts the magnetic field emitting surface of one electromagnet 11a. Next, current from current sources 12a, 12b is supplied to windings 15a, 15b of the correspond ing electromagnets 11a, 11b to excite the iron cores 14a, 14b. As a result, mag netic forces act from the electromagnets 11a, 11b only in the longitudinal direc tion of the sheet 10 to provide tension pulling the sheet 10 longitudinally so that the sheet 10 without rigidity is held to levitate in air stably approximately straight without any vibration. Under this condition is removed the holding of the sheet 10 by the fork lift so that surface treatment like painting of the sheet 10 is carried out.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic levitation 5A device, particularly a magnetic levitation device for levitating an object using a plurality of magnetic field application means and performing surface treatment on the object. .

[Prior Art] FIG. 2 is a diagram showing a schematic configuration of a conventional magnetic levitation device. The configuration and operation of a conventional magnetic levitation device will be described below with reference to FIG.

A conventional magnetic levitation device includes electromagnets 2a and 2b that apply a magnetic field to the iron material 1 to be levitated, and the iron material 1 and the electromagnets 2a and 2.
gap sensors 3a, 3b that respectively detect the distances from the gap sensors 3a, 3b and provide the distance detection information to the current dust control circuits 4a, 4b, and current sources 5a, 5b in response to the distance detection information from the gap sensors 3a, 3b. The current from the electromagnets 2a, 2b is controlled by controlling the current from the
current control circuits 4a and 4b that optimize the distance between the iron material 1 and the electromagnets 2a and 2b by adjusting the electromagnetic force of b; and a current source 5a that supplies current to the current control circuits 4a and 4b, respectively.
, 5b. Here, the electromagnets 2a and 2b are arranged so that their magnetic field emission surfaces face the longitudinal plane portion of the iron material 1. Next, the operation will be explained.

Electromagnets 2a and 2b are excited by currents from current sources 5a and 5b via current control circuits 4a and 4b, causing iron material 1 to levitate. Gap sensor 3a.

3b detects the distance between the flat part of the iron material 1 and the electromagnets 2a, 2b, respectively, and provides an information signal corresponding to the distance to the current control circuits 4a, 4b. Current control circuits 4a and 4b control currents from current sources 5a and 5b in response to distance information signals from gap sensors 2a and 2b, thereby controlling electromagnets 2a and 2b.
Give to 2b. The electromagnets 2a and 2b are current control circuits 4a,
A magnetic field corresponding to the current from 4b is applied to the iron material 1 to stably levitate the iron material 1 to an optimal position. After this, the iron material 1 was subjected to surface treatments such as coating and anti-corrosion treatment.

[Problems to be Solved by the Invention] In conventional magnetic levitation devices, the magnetic field emitting surface of the electromagnet that levitates the iron material is disposed so as to face a flat portion in the longitudinal direction of the iron material.

However, with the above configuration, if the object to be levitated has low rigidity, even if the gap sensor is used to adjust the electromagnetic force of the electromagnet to levitate the object to the optimal position,
The displacement of each part in the length direction of the object is not the same, vibration phenomena occur in the object, and it is difficult to obtain a stable floating state.

On the other hand, there has been a growing demand to levitate objects with low rigidity, such as thin plates and round bars, and to perform surface treatments such as uniform coating and anti-corrosion processing.

Therefore, an object of the present invention is to provide a magnetic levitation device which eliminates the above-mentioned drawbacks and is capable of stably levitating even objects with low rigidity such as thin plates and round bars.

[Means for Solving the Problems] The magnetic and air levitation device according to the present invention comprises at least a pair of 6tHY levitation devices such that their magnetic field emitting surfaces face each other with an interval slightly longer than the length of the object to be levitated. A magnetic levitation device, wherein an applying means is arranged between the pair of magnetic field applying means, and the object is levitated such that an end surface of the object and a magnetic field emitting surface of the magnetic field applying means face each other. It is.

[Effect 1 According to the above configuration, the magnetic force applied to the object to be levitated by the magnetic field from the magnetic field applying means acts only in the length direction of the object, and is a tension force that pulls the object to be levitated in the direction of the levitation. Therefore, even if the object to be levitated is a material with low rigidity, stable levitation can be obtained without vibration phenomena (Y) occurring.

Further, there is no need for a control device for optimizing the distance between the electromagnet and the object to be levitated, and the configuration of the magnetic levitation device becomes very simple.

[Embodiment of the Invention] An embodiment of the invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing the configuration of a magnetic levitation device which is an embodiment of the present invention. In FIG. 1, a magnetic levitation device according to an embodiment of the present invention includes electromagnets 11a and 11 that apply a magnetic field to a material 10 with low rigidity (a thin plate in this embodiment).
b, and an electromagnet 11a.

Current sources 12a and 12tl that give 19 to 11b to excite electromagnet 118.11b, and electromagnet 11a.

It is composed of pillars 13a and 13b that support the support 11b.

Here, the electromagnets 11a, 11b are made up of iron cores 14a, 14b and windings 15a, 15b wound around the iron cores 14a, 14b. 14a, 14b
) are arranged to face each other, and the distance between the electromagnets 11a and 11b is several mm to icm better than the length of the thin plate 10. Next, the operation will be explained.

First, using, for example, a forklift, the thin plate 10 is placed so that its end face faces the magnetic field emission surfaces of the electromagnets 11a and 11b,
It is held in a predetermined position so that one end surface is in contact with one of the magnetic field emitting surfaces (electromagnet 11a in FIG. 1) of electromagnet 118.11b. Next, current sources 12a and 12b
to the corresponding electromagnets 118.11b (i.e. windings 15a, 15b), and the electromagnets 11a, 11b
(That is, the iron cores 14a and 14b) are excited.

As a result, the thin plate 10 receives the magnetic force in the longitudinal direction due to the magnetic fields from the electromagnets 11a and 11b, and is stably held in the air in a straight line. In this state, the thin plate 10 is removed from being held by a forklift, for example, and surface treatment such as coating is performed on the thin plate 10.

Here, the reason why the thin plate 10 with low rigidity is stably held in the air is that unlike the conventional case, the magnetic force from the electromagnet 113.11b is applied only in the length direction of the thin plate 10, and the thin plate 10 is 11a.

This is because it acts as if being pulled from 11b.

Further, the force that presses one end surface of the thin plate 10 against the magnetic field emitting surface of one electromagnet 11a is the difference in magnetic force exerted on the thin plate 10 by both electromagnets 11a and 11b.

Its value is extremely small.

When it is desired to treat the end face of the thin plate 10, the thin plate 10
the other end surface (the end surface near the electromagnet 11b in FIG. 1)
First! ■After treatment, the electromagnet 11 near the other end face
By increasing the magnetic force b, it is possible to easily attract the thin plate 10 to the surface of the iron core 14b, which is the magnetic field emission surface of the electromagnet 11b. As a result, one end surface of the thin plate 10 is connected to the electromagnet 11.
Since the magnetic field emitting surface a is separated from the iron core 14a, one end surface of the thin plate 10 is processed in this state.

In the above embodiment, one end surface of the a-plate 10 is initially in contact with the iron core 14a, which is the magnetic field emitting surface of the electromagnet 11a, but the other end surface of the thin plate 10 is initially in contact with the iron core 14b, which is the magnetic field emitting surface of the electromagnet 11b. Needless to say, they are exactly the same even if they are brought into contact with each other.

Further, in the above embodiment, an electromagnet is used as the magnetic field applying means, but the same effect can be obtained even if a permanent magnet is used.
9.

Further, in the above embodiments, a thin plate is used as the object to be levitated, but it goes without saying that the shape is not limited to a thin plate.

Furthermore, the material of the object to be levitated only needs to contain a magnetic material, and the same effects as in the above embodiments can be obtained even with laminated materials.

Furthermore, in the above embodiment, a pair of electromagnets are used to
However, if a plurality of pairs of magnetic field application means are provided in parallel and each pair of magnetic field application means is processed simultaneously, the processing capacity can be significantly increased by 1 yen.

[Effects of the Invention] As described above, in the present invention, at least one pair of magnetic field applying means is installed so that the magnetic field emission surfaces face each other at an interval longer than the length of the object to be levitated, and In the applying means, the object to be levitated is levitated such that the end face of the object to be levitated and the magnetic field emitting surface of the eye field applying means are opposed to each other, so even materials with low rigidity can be levitated stably. Furthermore, there is no need for a control device for optimizing the distance between the magnetic field applying means and the object to be levitated, and the configuration of the device becomes easy.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a schematic configuration of a magnetic levitation device which is an embodiment of the present invention. FIG. 2 is a diagram showing a schematic configuration of a conventional magnetic levitation device. In the figure, 10 is a thin plate, 11a, 11bLL electromagnets. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (4)

[Claims] (1) A magnetic levitation device for levitating an object having an end face and a length using a magnetic field, comprising at least a pair of magnetic field applying means each having a magnetic field emitting surface for applying a magnetic field to the object, The pair of magnetic field applying means are arranged such that their magnetic field emitting surfaces face each other and the distance between the magnetic field emitting surfaces is longer than the length of the object, and between the pair of magnetic field applying means, the A magnetic levitation device that levitates the object so that an end surface of the object and the magnetic field emission surface face each other. (2) The magnetic levitation device according to claim 1, wherein the magnetic field applying means is an electromagnet. (3) The magnetic levitation device according to claim 1, wherein the magnetic field applying means is a permanent magnet. (4) the object is a substance containing at least a magnetic substance;
A magnetic levitation device according to any one of claims 1 to 3.