JPH0787148B2 - Magnet for conveying magnetic material - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnet for conveying a magnetic material used for conveying a steel belt of a tire from a cutting position to a molding position.

[0002]

2. Description of the Related Art Conventionally, a general electromagnet having a coil wound around an iron core has been used as a magnet for carrying a magnetic material.

[0003]

However, according to such an electromagnet, due to the inherent magnetic hysteresis as shown in FIG. 4, the attraction force remains due to the residual magnetism even when the power is turned off, so that the magnetic material after conveyance is carried out. There was a problem when separating from.

As an example, the case where the steel belt of the tire is conveyed from the cutting position to the tire molding position will be described.

The steel belt is carried on a cylindrical forming drum and wound in the circumferential direction in the tire forming process.

In this case, since the electromagnet needs to set the tip of the belt at a predetermined position on the molding drum, the electromagnet attracts the tip of the belt and pulls and moves it toward the drum.

However, when the electromagnet is separated after the belt is conveyed, the residual magnetic force may cause the front end side of the belt to be dragged and moved by the electromagnet to be tilted with respect to the tire equator or displaced in the width direction.

When the belt is displaced, the belt is not properly attached when the belt is conveyed, positioned on the carcass, and wound by automatic operation, which adversely affects the uniformity of the tire. It was.

Therefore, the present invention provides a magnet for carrying a magnetic material, which can prevent the positional deviation of the material (magnetic material) to be transported due to the residual magnetism as described above.

[0010]

According to the present invention, a magnetic fluid and a coil for magnetizing the magnetic fluid are provided in an adsorption box provided with an adsorption surface for a magnetic substance as an object to be conveyed. is there.

[0011]

The magnetic fluid (suspension in which ferromagnetic powder such as colloid-sized magnetite is stably dispersed) does not exhibit magnetic hysteresis (Fig. 4) like a general electromagnet, as is well known. As shown in FIG. 3, it has a characteristic that the magnetic flux disappears at the same time when the magnetizing force disappears.

Therefore, according to the magnet using the magnetic fluid, after the magnetic material is conveyed, the power supply to the coil can be cut off and at the same time the magnetic material can be reliably separated from the magnetic material. Therefore, there is no possibility that the magnetic body will be displaced during this separation.

[0013]

Embodiments of the present invention will be described with reference to the drawings.

In this embodiment, a magnet for conveying a rubber-coated steel belt for tire (hereinafter, simply referred to as a belt) from a cutting position to a tire molding position is taken as an example.

As shown in FIG. 1, this magnet is constructed such that a magnetic fluid 2 and a coil 3 for magnetizing the magnetic fluid 2 are housed in an adsorption box 1.

The suction box 1 is formed in a flat rectangular parallelepiped shape,
The lower surface 1a is a suction surface for the belt.

The coil 3 is wound around coil struts 4 provided at the four corners of the adsorption box 1, and the coil 3 is energized from an external power source through a lead wire 5.

When the coil 3 is energized, the magnetic fluid 2 (more precisely, the ferromagnetic powder in the solvent) is magnetized to exert a magnet action.

FIG. 2 shows how the belt B is conveyed by this magnet.

The suction box 1 is attached to a magnet moving device 5, which allows the belt cutting position and the molding drum 6 to be moved.
It is possible to move horizontally to and from the tire molding position and to move up and down. In FIG. 2, 7 is a horizontal moving rail of the magnet moving device 5, 8 ... is a guide roller for moving and guiding the belt B, and 9 is a guide member thereof.

This magnet pulls and moves the belt B cut toward the molding drum 6 in a state where the front end of the cut belt B is attracted as shown by the phantom line in FIG. Then, the conveyed belt B is set at a predetermined position on the molding drum 6 as shown by the solid line in FIG.

In this case, when the coil 3 is de-energized after the belt is conveyed, the magnetic flux of the magnetic fluid 2 immediately becomes zero (there is no residual magnetism) due to the hysteresis characteristic shown in FIG.
Therefore, the magnet can be reliably separated from the belt B. That is, unlike the case where a conventional general electromagnet is used, there is no fear that the belt will not be separated from the magnet due to the residual magnetic force and will be dragged by the magnet to move.

By the way, this magnet for carrying a magnetic material can be used for carrying other tire parts made of a magnetic material such as a carcass and beads in addition to the steel belt B mentioned in the above embodiment. Further, it is applicable not only to tire parts but also for transporting magnetic material or products in various industrial fields.

On the other hand, the shape and size of the suction box 1 can be appropriately selected according to such applications.

[0025]

As described above, in the case of the magnet for carrying a magnetic material according to the present invention, the magnetic material is attracted and carried by the magnetic fluid having the characteristic that the magnetic flux disappears and the magnetic flux becomes zero at the same time. Therefore, after the magnetic material is conveyed, it is possible to cut off the power supply to the coil and at the same time reliably separate the magnetic material.

Therefore, since there is no risk that the magnetic material will move and shift its position during this separation, it is possible to accurately convey the magnetic material to a predetermined position. For example, when it is used for conveying a steel belt of a tire, the belt is used. It is possible to solve the problem that the uniformity of the tire is deteriorated due to the positional deviation.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a magnet for carrying a magnetic material according to an embodiment of the present invention.

FIG. 2 is a view for explaining the operation of conveying a steel belt of a tire by the magnet.

FIG. 3 is a hysteresis curve diagram of a magnetic fluid used in the magnet.

FIG. 4 is a hysteresis curve diagram of a conventional general electromagnet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Adsorption box 1a Lower surface (adsorption surface) of adsorption box 2 Magnetic fluid 3 Coil 4 Coil support B Steel belt of tire as magnetic material to be conveyed

Claims (1)

[Claims] 1. A magnet for carrying a magnetic material, characterized in that a magnetic fluid and a coil for magnetizing the magnetic fluid are provided in an adsorption box having an adsorption surface for a magnetic material as an object to be conveyed. .