JPH0562823A - Magnetic adsorption device - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To provide a magnetic attraction device in which a permanent magnet rotates in response to a linear force. [Structure] The magnetic attraction device 10 of the present invention includes a magnetic action surface 2
A magnetic circuit block 12 having a cavity 2 and a cavity 14, and a cavity 1
4 and a permanent magnet 16 rotatable about the axis of the cavity 14 and movable in the direction of the axis, and a rod 28 connected to the permanent magnet 16 and extending outside the cavity 14, Is provided with a groove 32 that extends in a spiral shape on the peripheral surface of the permanent magnet 16, and a projection 34 that engages with the groove 32 is provided in the magnetic circuit block 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic attraction device that holds or holds a magnetic material in a switchable manner.

[0002]

2. Description of the Related Art Conventionally, magnetic attraction devices have been disclosed in, for example, Japanese Patent Publication No.
No. 0-46803, a magnetic circuit block having a magnetically active surface and a cavity, a permanent magnet disposed within the cavity and rotatable about an axis of the cavity, and rotatable on the permanent magnet. And an operation knob for giving force.

[0003]

According to the conventional magnetic attraction device described above, by rotating the operating knob to rotate the permanent magnet, the magnetic action surface of the magnetic circuit block accommodating the permanent magnet is excited or not excited. It can be placed in an excited state, whereby the magnetic action surface can be imparted with a magnetic substance such as a work piece or an object such as a bed of a machine tool, and it can be released. By the way, it is conceivable to install the magnetic attraction device in an automation line and use it, and in this case, the remote operation of the magnetic attraction device may use an actuating device for giving a rotational force to the operation knob. Conceivable. However, in order to remotely operate the magnetic attraction device, it is easier to control the actuator by using an actuator that applies a linear force, such as a hydraulic cylinder, than an actuator that applies a rotational force. It is advantageous in reducing the installation cost. An object of the present invention is to provide a magnetic attraction device in which a permanent magnet receives a linear force to rotate.

[0004]

[Means for Solving the Problems, Actions and Effects of the Invention]
A magnetic attraction device according to the present invention includes a magnetic circuit block having a magnetic surface and a cavity, a magnetic circuit block disposed in the cavity, rotatable substantially around an axis of the cavity, and movable in a direction of the axis. A permanent magnet, and a rod connected to the permanent magnet and extending to the outside of the cavity, wherein the permanent magnet is provided with a groove extending spirally around the peripheral surface of the permanent magnet,
The magnetic circuit block is provided with a protrusion that engages with the groove.

According to the present invention, the projection of the magnetic circuit block is engaged with the spiral groove of the permanent magnet, and the permanent magnet moves in the cavity of the magnetic circuit block in the axial direction and the axial direction. Since it is movable around, when a tensile force or a pressing force is applied to the permanent magnet in the axial direction via the rod, the relative position of the groove to the protrusion changes due to the reaction of the protrusion, A linear movement in the axial direction and a rotational movement about the axis occur simultaneously in the permanent magnet. The magnetic action surface of the magnetic circuit block can be placed in an excited state or a non-excited state by the rotational movement of the permanent magnet, and the axial force to the rod is applied by using an actuator such as a hydraulic cylinder. can do.

The groove may be provided in a non-magnetic member that is connected to one end or the other end of the permanent magnet and is movable together with the permanent magnet.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 and 2, a magnetic attraction device 10 according to the present invention has a cylindrical shape disposed inside a magnetic circuit block 12 and a cylindrical cavity 14 provided in the magnetic circuit block 12. And a permanent magnet 16 of.

The magnetic circuit block 12 has a substantially rectangular cross-sectional shape, and a pair of opposed elongated magnetic pole members 18 are provided.
And an elongated plate-shaped non-magnetic separator 20 disposed between the magnetic pole members 18 and bonded to the magnetic pole members 18.

The magnetic circuit block 12 usually has a groove 21 having a pair of side wall surfaces extending from the bottom surface of the separator 20 at the bottom in FIG. The lower surface of each magnetic pole member 18 defines a magnetic action surface 22. Each magnetic action surface 22
When the permanent magnet 16 is rotated, it is placed in an excited state in which it can be magnetically attracted to a magnetic material (not shown) such as a workpiece or a part of a machine tool, and a non-excited state in which it is released.

The cavity 14 of the magnetic circuit block 12 is formed by hollowing out the side portion of each magnetic pole member 18 and the central portion of the separator 20 in a cylindrical shape in the longitudinal direction thereof, and the length dimension thereof is that of the permanent magnet 16. It is longer and its diameter is slightly larger than the diameter of the permanent magnet 16. It is desirable that the difference between the length dimensions of the cavity 14 and the permanent magnet 16 is set to be substantially equal to the length dimension of the figure obtained by orthographically projecting the groove 32 described later on a plane including the axis of the permanent magnet 16. As a result, the movement distance that the permanent magnet 16 advances in the axial direction is secured while the projection 34 described later is engaged from the start point to the end point of the groove 32.

Both ends of the cavity 14 are closed by non-magnetic plates 24 and 26 fixed to the magnetic pole member 18 with screws 23, for example. The cavity 14 may be a hole whose one end is open instead of the through hole, and only the open end may be closed by a plate (not shown).

A rod 28 is coaxially connected to one end of the permanent magnet 16. In the illustrated example, the rod 28 is bonded to one end of the permanent magnet 16 and is connected to the permanent magnet 16 via a connecting member 30 made of a non-magnetic disc having the same diameter as the permanent magnet. The planar shape of the connecting member 30 is not limited to a circular shape, and may be, for example, a polygonal shape, and the rod 28 can be directly connected to the one end of the permanent magnet 16 without the connecting member 30. The tip of the rod 28 slidably penetrates the plate 24,
It extends outside the cavity 14. An axial pulling force or a pressing force can be applied to the permanent magnet 16 via the rod 28.

As an alternative to the illustrated example of fixing the rod 28 to the connecting member 30, the rod 28 can be connected to the connecting member 30 such that the rod 28 is rotatable with respect to the connecting member 30, which allows For example, the rotational movement, which will be described later, that occurs in the permanent magnet 16 due to the axial movement of the rod 28 is prevented from being transmitted to the rod 28.

The permanent magnet 16 is provided with a groove 32 having a circumferential surface (cylindrical surface) extending in a spiral shape, and the magnetic circuit block 12, more specifically, the separator 20 is provided with a projection 34 engaging with the groove 32. Is provided. In the illustrated example, the groove 32
Is 9 from the point on the one end of the permanent magnet 16 in the spiral direction.
It extends to a point that has passed through a rotation angle of 0 degrees. Also, the protrusion 3
4 is a hole 3 provided in the separator 20 and opened to the cavity 16
It is composed of a small-diameter tip end portion provided on a cylindrical piece 38 that is press-fitted or screwed into 6. The hole 36 is formed by the projection 34 in the groove 32 when the connecting member 30 is in contact with the plate 24.
It is provided at the position corresponding to the end point of.

When a pressing force is applied to the rod 28, the permanent magnet 16 receives a rotational force in the clockwise direction as viewed in FIG. 1 as a reaction from the projection 34 engaging with the groove 32. For this reason, the permanent magnet 16 is provided while the protrusion 34 is engaged with the groove 32.
Rotate 90 degrees clockwise and move hole 16 to the left as viewed in FIG. The rotational movement and the linear movement of the permanent magnet 16 stop when the protrusion 34 comes into contact with the connecting member 30. Similarly, when a tensile force is applied to the rod 28, the permanent magnet 16 rotates counterclockwise as viewed in FIG. 1 and linearly moves to the right as viewed in FIG. When the magnetization direction of the permanent magnet 16 coincides with the lateral direction across the magnetic pole member 18 and the separator 20 as viewed in FIG. 1, the magnetic action surface 22 is in an excited state, and the downward direction is the extending direction of the separator 20 (upward and downward direction). ), It becomes a non-excitation state.

Instead of the illustrated example, the groove 32 can be set so as to extend a rotation angle of 90 degrees or more, and
It may be provided on the other end side of the permanent magnet 16 or in the central portion.

As shown in FIGS. 3 and 4, the groove 32 is a non-magnetic member 40 coaxially connected to the permanent magnet 16.
Can be formed. The illustrated non-magnetic member 40 has a cylindrical body shape of the same diameter whose length dimension is shorter than that of the permanent magnet 16,
It is fixed to the one end of the permanent magnet 16. of course,
The non-magnetic member 40 does not prevent being longer than the permanent magnet 16. The non-magnetic member 40 may be connected to the other end of the permanent magnet 16.

Further, when the permanent magnet 16 is replaced by the columnar shape shown in FIGS. 1 and 2, a so-called oval shape having a pair of opposite side surfaces parallel to the magnetization direction is used. It is preferable to use the non-magnetic member 40 provided with the above-mentioned groove rather than providing the magnet 16 itself with the groove.

[Brief description of drawings]

FIG. 1 is a front view of a magnetic attraction device according to the present invention.

2 is a longitudinal cross-sectional view of the magnetic circuit block taken along line 2-2 of FIG.

FIG. 3 is a front view of another example of the magnetic attraction device according to the present invention.

4 is a longitudinal cross-sectional view of the magnetic circuit block taken along line 4-4 of FIG.

[Explanation of symbols]

 10 magnetic adsorption device 12 magnetic circuit block 14 cavity 16 permanent magnet 22 magnetic surface 28 rod 32 groove 34 protrusion

Claims (2)

[Claims] 1. A magnetic circuit block having a magnetically active surface and a cavity, a permanent magnet disposed in the cavity, rotatable about an axis of the cavity and movable in the direction of the axis, and the permanent magnet. A rod which is connected to a magnet and extends to the outside of the cavity, wherein the permanent magnet is provided with a groove extending spirally on the peripheral surface of the permanent magnet, and the magnetic circuit block has a protrusion engaging with the groove. A magnetic adsorption device provided. 2. A magnetic circuit block having a magnetically active surface and a cavity, disposed within the cavity and coupled to each other,
A permanent magnet and a non-magnetic member rotatable about the axis and movable in the direction of the axis of the cavity; and a rod connected to the permanent magnet or the non-magnetic member and extending outside the cavity, The non-magnetic member is provided with a groove that extends in a spiral shape on the peripheral surface of the non-magnetic member, and the magnetic circuit block is provided with a protrusion that engages with the groove.
Magnetic adsorption device.