WO2021020827A1

WO2021020827A1 - Magnetic lift device having magnetic-field adjusting function

Info

Publication number: WO2021020827A1
Application number: PCT/KR2020/009835
Authority: WO
Inventors: 박상훈; 백명기; 곽창섭; 여창호; 정진교
Original assignee: 한국전기연구원
Priority date: 2019-07-26
Filing date: 2020-07-27
Publication date: 2021-02-04
Also published as: KR20210012602A; KR102322735B1

Abstract

A magnetic lift device comprises a first pole piece, a second pole piece, a rotary permanent magnet, a magnet rotating unit, and a pole piece connecting unit. The first pole piece is magnetically connected to the N pole of a fixed permanent magnet, the second pole piece is magnetically connected to the S pole of the fixed permanent magnet, the rotary permanent magnet is rotatably formed so as to be selectively arranged between a first arrangement in which the N pole is magnetically connected to the second pole piece and the S pole is magnetically connected to the first pole piece, and a second arrangement in which the N pole is magnetically connected to the first pole piece and the S pole is magnetically connected to the second pole piece, the magnet rotating unit rotates the rotary permanent magnet so as to switch between the first and second arrangements, thereby controlling the magnetic force applied to an object to be lifted through the first pole piece and the second pole piece, and the pole piece connecting unit magnetically connects the first pole piece to the second pole piece in order to prevent saturation of the magnetic flux in the object to be lifted.

Description

Magnetic lift device with magnetic field adjustment function

The present invention relates to a magnetic lift device, and more particularly, to a magnetic lift device for controlling a magnetic force on an action surface by inserting a bar (Bar) preventing magnetic saturation in an object.

A magnetic lift device is a device that lifts an attachment object composed of a magnetic material such as iron using magnetic force, and is widely used today as an internal device attached to a chuck of a machine tool, clamping a mold of an injection machine, clamping a mold of a press machine, and the like.

This magnetic lift device basically attaches the lifting object, which is a magnetic material, to the working surface using the strong magnetic force of the permanent magnet. When released, the magnetic flow from the permanent magnet is controlled to prevent the magnetic flow from being formed on the working surface. Move the object away from the surface of action.

1 is a schematic cross-sectional view of an example of a conventional magnetic lift device. 1, a magnetic lift device for holding and releasing by rotating a permanent magnet to change a magnetic circuit is disclosed.

The magnetic lift device shown in FIG. 1 can lift or drop a steel plate using a magnet that rotates by a fixed magnet and a magnetic field generated by the coil, and requires a pulsed current to the coil only during operation, and the state after completion of the operation. It does not require additional energy to maintain.

However, since the conventional magnetic lift shown in FIG. 1 lifts or drops a steel plate or the like according to the direction of the rotating magnet, an accurate operation of the rotating magnet is required, but a device capable of controlling the malfunction of the rotating magnet is not provided.

Accordingly, when the thickness of the object to be lifted is thin, magnetic saturation occurs in the object, and thus the rotating magnet does not operate in a desired direction during operation of the coil, resulting in a problem that the object cannot be lifted.

The present invention has been conceived to solve the above-described conventional problem, and an object of the present invention is to provide a magnetic lift system capable of performing effective lifting by preventing malfunction of a rotating magnet regardless of the thickness of a lifting object.

In order to achieve the above object, the magnetic lift device according to the present invention includes a fixed permanent magnet, a first pole piece, a second pole piece, a rotating permanent magnet, a magnet rotating part, and a pole piece connecting part.

The first pole piece is magnetically connected to the N pole of the fixed permanent magnet, the second pole piece is magnetically connected to the S pole of the fixed permanent magnet, and the N pole of the rotating permanent magnet is magnetically connected to the second pole piece. A first arrangement state in which the S pole is magnetically connected to the first pole piece and the N pole is magnetically connected to the first pole piece, and the S pole is magnetically connected to the second pole piece. It is configured to be rotatable so as to be selectively arranged between the second arrangement states, and the magnet rotating part rotates the rotating permanent magnet to generate a changeover between the first arrangement state and the second arrangement state, through the first pole piece and the second pole piece. The magnetic force applied to the lifting object is controlled, and the pole piece connection part magnetically connects the first pole piece and the second pole piece to a predetermined thickness to prevent saturation of magnetic flux in the lifting object.

According to this configuration, by connecting a pole piece connection of an appropriate thickness according to the lifting object between the pole pieces, saturation of the magnetic flux in the lifting object is prevented, thereby preventing malfunction of the rotating magnet regardless of the thickness of the lifting object, thereby effectively lifting. You will be able to perform.

In this case, the pole piece connection part may contact the first pole piece and the second pole piece, respectively. According to this configuration, it is possible to prevent saturation of the magnetic flux in the lifting object by directly fastening and releasing the connecting member of an appropriate thickness to the pole pieces as needed.

In addition, the pole piece connection part includes a first connection part in contact with the first pole piece and a second connection part in contact with the second pole piece, and a connection selection for selectively performing mutual connection and separation of the first connection part and the second connection part May contain more wealth. According to this configuration, it is possible to more efficiently connect and separate the pole pieces through the selective connection of the connection parts separated from each other.

In addition, the pole piece connection unit further includes a third connection unit in contact with the first connection unit and a fourth connection unit in contact with the second connection unit, and the connection selection unit selectively further performs interconnection and separation of the third connection unit and the fourth connection unit can do. According to this configuration, it is possible to efficiently perform the connection between the pole pieces with different thicknesses as necessary.

In addition, the pole piece connection unit further includes a fifth connection unit in contact with the third connection unit and a sixth connection unit in contact with the fourth connection unit, and the connection selection unit selectively further performs interconnection and separation of the fifth connection unit and the sixth connection unit can do. According to such a configuration, according to such a configuration, it is possible to more efficiently perform the connection between the pole pieces in a variety of thickness as necessary.

According to the present invention, by connecting a pole piece connection of an appropriate thickness according to the lifting object between the pole pieces, saturation of the magnetic flux in the lifting object is prevented, thereby preventing malfunction of the rotating magnet regardless of the thickness of the lifting object to perform effective lifting. You can do it.

In addition, it is possible to prevent saturation of magnetic flux in the lifting object by directly fastening and releasing the connecting member having an appropriate thickness to the pole pieces as necessary.

In addition, it is possible to more efficiently connect and separate the pole pieces through the selective connection of the connection parts separated from each other.

In addition, it is possible to efficiently perform the connection between the pole pieces with different thicknesses as needed.

In addition, according to such a configuration, it is possible to more efficiently perform the connection between the pole pieces in a variety of thickness as necessary.

1 is a schematic cross-sectional view of an example of a conventional magnetic lift device.

2 is a schematic block diagram of a magnetic lift device according to an embodiment of the present invention.

3 to 6 are schematic cross-sectional views of the magnetic lift device according to the first embodiment of FIG. 2.

7 to 9 are schematic cross-sectional views of the magnetic lift device according to the second embodiment of FIG. 2.

10 to 13 are schematic cross-sectional views of the magnetic lift device according to the third embodiment of FIG. 2.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

2 is a schematic block diagram of a magnetic lift device according to an embodiment of the present invention. 2, the magnetic lift device 100 is a fixed permanent magnet 110, a first pole piece 120, a second pole piece 130, a rotating permanent magnet 140, a magnet rotating part 150, a pole piece connection part (160), and a connection selection unit 170. The first pole piece 120 is magnetically connected to the N pole of the fixed permanent magnet 110, and the second pole piece 130 is magnetically connected to the S pole of the fixed permanent magnet 110.

The rotating permanent magnet 150 has a first arrangement state in which the N pole is magnetically connected to the second pole piece 130 and the S pole is magnetically connected to the first pole piece 120, and the N pole is controlled. It is configured to be rotatable such that the S pole is magnetically connected to the first pole piece 120 and the S pole is selectively disposed between the second pole piece 130 and the second arrangement state that is magnetically connected.

The magnet rotating unit 150 rotates the rotating permanent magnet to generate a change between the first and second arrangement states, thereby reducing magnetic force applied to the lifting object through the first pole piece 120 and the second pole piece 130. Control.

3 to 6 are schematic cross-sectional views of the magnetic lift device according to the first embodiment of FIG. 2. In FIGS. 3 to 6, the magnetic lift device 100 includes a fixed permanent magnet 110, a first pole piece 120, a second pole piece 130, a rotating permanent magnet 140, a magnet rotating part 150, And it can be seen that including the pole piece connection 160.

The first pole piece 120 and the second pole piece 130 are made of a ferromagnetic material such as iron and have an action surface capable of acting in contact with a lifting object. The rotating permanent magnet 140 is in a first arrangement state in which the S pole is magnetically connected in proximity to the first pole piece 120 and the N pole is magnetically connected in proximity to the second pole piece 130 (Fig. 3 and 4) and a second magnetically connected N pole close to the first pole piece 120 and magnetically connected S pole close to the second pole piece 130 It is arranged rotatably so as to switch between the arrangement states (the arrangement states in FIGS. 5 and 6).

More specifically, the rotating permanent magnet 140 is disposed between the first pole piece 120 and the second pole piece 130, magnetically between the first pole piece 120 and the second pole piece 130. Can be connected by However, when the rotating permanent magnet 140 is in the first arrangement state and the second arrangement state, magnetic flows in opposite directions are formed, respectively.

It is preferable that the rotating permanent magnet 140 is configured to be rotatable by minimizing friction. In addition, the closer the separation distance between the first pole piece 120 and the second pole piece 130 in the first arrangement state and the second arrangement state is, the closer the magnetic flow can be formed.

The'magnetically connected' between the rotating permanent magnet 140 and the

pole pieces

120 and 130 means that the

pole pieces

120 and 130 are formed by the magnetic force of the rotating permanent magnet 140 even if they are not in direct contact. Includes things that are spaced apart enough to form a magnetic flow.

Meanwhile, the rotating permanent magnet 140 exemplifies a structure in which a permanent magnet is molded into a specific shape in the present embodiment, but is not limited thereto, and may be formed of a combination of a permanent magnet and a pole piece. The fixed permanent magnet 110 is disposed such that the N pole contacts the first pole piece 120 and the S pole contacts the second pole piece 130. The fixed permanent magnet 110 is preferably positioned closer to the working surfaces 111 and 121 than the rotating permanent magnet 140.

The magnet rotating part 150 may be implemented in various forms, but it will be generally implemented in the form of a coil 150 as shown in FIGS. 3 to 6. The coil 150 may be wound around at least one of the first pole piece 120 and the second pole piece 130.

The coil 150 may be disposed in an appropriate position to change the magnetic flow, and FIGS. 3 to 6 illustrate that it is disposed between the rotating permanent magnet 140 and the fixed permanent magnet 110, and efficient magnetic flow control In this arrangement, this arrangement is preferred.

The pole piece connection unit 160 magnetically connects the first pole piece 120 and the second pole piece 130 to a predetermined thickness to prevent saturation of magnetic flux in the lifting object. According to this configuration, by connecting the pole piece connection 160 of an appropriate thickness according to the lifting object between the

pole pieces

120 and 130, the magnetic flux saturation in the lifting object is prevented, so that the rotating magnet is irrespective of the thickness of the lifting object. It is possible to perform effective lifting by preventing the malfunction of.

In this case, the pole piece connection unit 160 may contact the first pole piece 120 and the second pole piece 130, respectively. 3 to 6 illustrate examples in which the pole piece connection unit 160 is implemented in a single bar shape to contact the first pole piece 120 and the second pole piece 130, respectively.

In the conventional magnetic lift, a magnetic field control device (bar) capable of adjusting a magnetic field applied to an object is added, and thereby, plates of various thicknesses and weights can be lifted. At this time, various types of fixing devices such as bolts can be used to add/remove bars according to the state of the plate (thickness, weight, etc.).

In addition, the pole piece connection unit 160 may include a first connection part 161 in contact with the first pole piece 120 and a second connection part 162 in contact with the second pole piece 130, at this time, The connection selection unit 170 selectively connects and separates the first connection unit 161 and the second connection unit 162.

At this time, the pole piece connection unit 160 further includes a third connection unit 163 in contact with the first connection unit 161 and a fourth connection unit 164 in contact with the second connection unit 162, and a connection selection unit 170 ) May further selectively perform mutual connection and separation of the third connection unit 163 and the fourth connection unit 164.

7 to 9 are schematic cross-sectional views of the magnetic lift device according to the second embodiment of FIG. 2. In FIGS. 7 to 9, the pole piece connection part 170 is implemented in the form of a magnetic field control device disposed in the enclosure, and the first connection part 161 to the fourth connection part 164 are connected and separated in various combinations. An example is shown.

According to this configuration, it is possible to manually or automatically connect or disconnect the pole piece connection unit 170 without fixing devices such as bolts, so that the use of the pole piece connection unit 160 in the first embodiment is troublesome. Will be able to reduce

More specifically, the magnetic field control device is composed of one or more layers composed of two separate plates, and thus, the two separate plates are left and right in consideration of the condition (thickness, weight) of the object to be lifted. By separating by the edges, it is possible to adjust the magnetic field applied to the object.

Accordingly, when the object is thin and magnetic saturation occurs, the object can be lifted by combining all the separation plates, and when the object becomes heavy due to the thickness of the object, all the separation plates are separated to occur in the magnetic lift. By allowing all magnetic fields to flow through the object, the object can be lifted by increasing its power.

In addition, the pole piece connection part 170 further includes a fifth connection part 165 in contact with the third connection part 163 and a sixth connection part 166 in contact with the fourth connection part 164, and a connection selection part 170 ) May further selectively perform mutual connection and separation of the fifth connection unit 165 and the sixth connection unit 166.

10 to 13 are schematic cross-sectional views of the magnetic lift device according to the third embodiment of FIG. 2. In the third implementation example, it can be seen that the

connection parts

165 and 166 are further added than in the second implementation example, and the number of connection parts may be further added as necessary. According to this configuration, it is possible to more efficiently perform the connection between the pole pieces in a variety of thickness as necessary.

In summary, the present invention is to prevent magnetic saturation according to the state (thickness, weight, etc.) of an object by using a magnetic field adjustment device, thereby preventing malfunction of a rotating magnet and enabling accurate operation of a magnetic lift.

In the magnetic lift according to the prior art, when magnetic saturation occurs due to the thin object thickness, a malfunction occurs because the rotating magnet is not aligned in a predetermined direction, and thus the object cannot be lifted.

In the present invention, magnetic saturation in the object is prevented by separating/combining the separation plate of the magnetic field control device according to the thickness of the object, and by inducing the correct operation of the rotating magnet, various objects can be lifted without malfunction. In addition, in the case of using the present invention, it is possible to prevent accidents of falling objects because a malfunction is prevented when an object is lifted in the field.

Although the present invention has been described by some preferred embodiments, the scope of the present invention should not be limited thereto, and modifications or improvements of the above embodiments supported by the claims should also be reached.

Claims

Fixed permanent magnets;

A first pole piece magnetically connected to the N pole of the fixed permanent magnet;

A second pole piece magnetically connected to the S pole of the fixed permanent magnet;

A first arrangement state in which the N pole is magnetically connected to the second pole piece and the S pole is magnetically connected to the first pole piece, and the N pole is magnetically connected to the first pole piece. A rotating permanent magnet configured to be rotatable such that the S pole is selectively disposed between the second pole piece and the second arrangement state in which the second pole piece is magnetically connected;

A magnet rotating unit that rotates the rotating permanent magnet to cause a transition between the first and second arrangement states; And

And a pole piece connecting portion having a preset thickness for magnetically connecting the first pole piece and the second pole piece.
The method according to claim 1,

The pole piece connection portion magnetic lift device, characterized in that in contact with the first pole piece and the second pole piece respectively.
The method according to claim 1,

The pole piece connection part includes a first connection part connected to the first pole piece and a second connection part connected to the second pole piece,

And a connection selector selectively performing interconnection and separation of the first connection part and the second connection part.
The method of claim 3,

The pole piece connection part further includes a third connection part connected to the first connection part and a fourth connection part connected to the second connection part,

The magnetic lift device, wherein the connection selector further selectively performs interconnection and separation of the third connection part and the fourth connection part.
The method of claim 4,

The pole piece connection part further includes a fifth connection part connected to the third connection part and a sixth connection part connected to the fourth connection part,

The magnetic lift device, wherein the connection selector further selectively performs interconnection and separation of the fifth connection part and the sixth connection part.