JP2001316072A - Magnetic substance holding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic substance holding device for preventing an increase in energy consumption even when holding a magnetic substance for a long time. SOLUTION: The magnetic substance holding device comprises a permanent magnet 3 supported on a holding portion 1 in an approachable and separable manner for attracting and holding a held material as a magnetic substance contacting the holding portion 1 via the holding portion 1 and a cancelling device for keeping the permanent magnet 3 from the holding portion 1 against the attractive force of the permanent magnet 3 and cancelling the holding of the held material by the permanent magnet 3 by feeding a fluid between the permanent magnet 3 and the holding portion 1 via a fluid supply port 8 when the permanent magnet 3 holds the held material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic material holding device for holding a magnetic material by the attraction of a permanent magnet.

[0002]

2. Description of the Related Art As a magnetic material holding device for releasably holding a magnetic material by applying magnetism, for example, a device using an electromagnetic magnet (coil) is known. That is,
If a magnetic field is generated by winding a choke coil around an iron core and supplying a current to the choke coil, a magnetic body can be held at the tip of the iron core.

In such a magnetic material holding device, while the current is being supplied to the choke coil, the magnetic material is held, and the holding of the magnetic material is released by stopping the current supply.

[0004]

In the magnetic material holding apparatus as described above, the current supply must be continued while the magnetic material is held, and the energy consumption during holding is large.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a magnetic material holding device in which the energy consumption does not increase even if the magnetic material is held for a long time.

[0006]

In order to solve the above-mentioned problems, a magnetic material holding device according to the present invention is a magnetic material which is supported so as to be capable of moving toward and away from a holding portion and is in contact with the holding portion. A permanent magnet that attracts and holds the object to be held through the holding portion, and a fluid is sent between the permanent magnet and the holding portion when the permanent magnet holds the object to be held. Release means for separating the permanent magnet from the holding portion against the attractive force of the permanent magnet and releasing the holding of the held object by the permanent magnet is provided.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the magnetic material holding device according to the present invention has a cylindrical cylinder tube 1 whose upper end is open and whose lower end is closed by a bottom plate. The upper end side of the cylinder tube 1 is closed by a lid 7. The lid 7 has a screw portion on the outer peripheral portion, and the screw portion is connected to the cylinder tube 1.
The upper end of the cylinder tube 1 is closed by screwing into a screw portion provided inside the upper end of the cylinder tube 1.

The lid 7 has a cylindrical portion protruding inward and outward of the cylinder tube 1. A fluid supply port 8 penetrates through the cylindrical portion. That is, since the fluid supply port 8 penetrates from one end to the other end of the cylindrical portion provided on the lid 7, the inside of the cylinder tube 1 closed by the lid 7,
It is connected to the outside.

An annular piston 4 is housed in the cylinder tube 1. This piston 4
It is externally fitted to a cylindrical portion protruding from the lid 7 toward the inside of the cylinder tube 1, and is internally fitted to the inner wall of the cylinder tube 1. An inner peripheral side packing 5 is provided on an inner peripheral portion of the piston 4. The inner peripheral side packing 5 fills a gap between an inner peripheral portion of the piston 4 and a cylindrical portion protruding from the lid 7 toward the inner side of the cylinder tube 1, and also includes a piston 4.
Allows the slide in the axial direction with respect to the cylindrical portion. An outer peripheral side packing 2 is provided on an outer peripheral portion of the piston 4. This outer packing 2
Fills the gap between the outer peripheral portion of the piston 4 and the inner wall of the cylinder tube 1 and allows the piston 4 to slide in the axial direction with respect to the inner wall.
That is, the piston 4 is movable in the cylinder tube 1 in a direction of coming into contact with and separating from the bottom plate of the cylinder tube 1.

A permanent magnet 3 is disposed on the lower surface of the piston 4 opposite to the bottom plate of the cylinder tube 1. That is, the permanent magnet 3 is movable together with the piston 4 in a direction of coming into contact with and separating from the bottom plate of the cylinder tube 1. As the permanent magnet 3,
For example, a material that generates a strong magnetic field, such as a neodymium magnet, may be used. Between the piston 4 and the lid 7,
A spring 6 is provided. This spring 6
Between the piston 4 and the lid 7 in a state where the cylindrical portion protruded from the lid 7 toward the inner side of the cylinder tube 1 is externally fitted and slightly compressed from the natural state. The piston 4 is connected to the cylinder tube 1
Is pressed toward the bottom plate.

The lid 7 has, apart from the fluid supply port 8, an air hole for connecting the inside of the cylinder tube 1 to the outside. The presence of the air holes allows the piston 4 to contact the bottom plate of the cylinder tube 1 without being affected by the air trapped between the piston 4 and the lid 7 in the cylinder tube 1. It can move in the direction away.

By the way, as shown in FIG.
Is close to the bottom plate of the cylinder tube 1 by the urging force of the spring 6, the permanent magnet 3 is also close to the bottom plate, and the permanent magnet 3 is
A magnetic field is formed over the outer side of the cylinder tube 1. Therefore, when an object to be held, which is a magnetic material, comes into contact with the bottom plate of the cylinder tube 1, the permanent magnet 3 attracts and holds the object to be held through the bottom plate.
That is, the bottom plate portion of the cylinder tube 1 serves as a holding portion for holding the object to be held. Thus, the permanent magnet 3
Does not consume any energy when the object is sucked and held through the bottom plate of the cylinder tube 1. When the permanent magnet 3 is attracting and holding an object to be held, the magnetic substance holding device sends fluid between the permanent magnet 3 and the bottom plate of the cylinder tube 1 so that the permanent magnet 3 The permanent magnet 3 is separated from the bottom plate of the cylinder tube 1 against the attraction force,
There is a release means for releasing the holding of the object to be held by the permanent magnet 3.

The release means supplies a fluid such as compressed air or oil from the outside of the cylinder tube 1 through a fluid supply port 8 and applies pressure to the fluid so as to remove the fluid.
It is fed between the piston 4 provided with the permanent magnet 3 and the bottom plate of the cylinder tube 1. By the operation of the release means, the piston 4 is pushed up in a direction away from the bottom plate portion of the cylinder tube 1 against the attraction force of the permanent magnet 3 and the urging force of the spring 6, and the permanent magnet 3 is lifted from the bottom plate portion. Separate. As described above, when the permanent magnet 3 is separated from the bottom plate of the cylinder tube 1, the magnetic field outside the bottom plate is weakened, and the held object held in contact with the bottom plate is To be released.

By releasing the pressure against the compressed air or oil through the fluid supply port 8, the piston 4 returns to the bottom plate side of the cylinder tube 1 by the urging force of the spring 6, and is again held. An object can be sucked and held. At this time, the fluid between the piston 4 and the bottom plate of the cylinder tube 1 flows through the fluid supply port 8
It is discharged to the outside of the cylinder tube 1.

[0015]

According to the present invention, it is possible to provide a magnetic material holding device in which the energy consumption does not increase even if the magnetic material is held for a long time.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a configuration of a magnetic material holding device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder tube 2 Outer side packing 3 Permanent magnet 4 Piston 5 Inner side packing 6 Spring 7 Lid 8 Fluid supply port

Claims (1)

[Claims] A permanent magnet that is supported so as to be able to move toward and away from the holding portion, and that attracts and holds a magnetic object to be held in contact with the holding portion through the holding portion; When holding the object to be held, by sending a fluid between the permanent magnet and the holding portion, the permanent magnet is separated from the holding portion against the attractive force of the permanent magnet. And a releasing means for releasing the holding of the object to be held by the permanent magnet.