JPH10303017A - Magnetic-adsorption holder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mechanically work an adsorption surface while no magnetic force of a permanent magnet affected, by separately manufacturing an electromagnet assembly, a yoke, a permanent magnet, and an adjustment member, for assembly. SOLUTION: A magnetic adsorption holder 10 comprises an electromagnet assembly 14, a yoke 16, a permanent magnet 18, an adjustment member 20. Relating to the electromagnet assembly 14, an iron core 24 is allocated inside a cylindrical member 22, and an exciting coil 26 is allocated between the cylindrical member 22 and the iron core 24. Relating to one end of the iron core 24, an adsorption surface 34 which adsorbs a magnetic body 32 is formed together with, in common, one end of the cylindrical member 22. Relating to the yoke 16, a recessed part 42 side is allocated on the electromagnetic assembly 14 side, being assembled on the side opposite to the adsorption surface 34. A permanent magnet 18 is so allocated in the recess 42 of the yoke 16 that one magnetic pole surface contacts to the iron core 24 while the other magnetic pole surface to the yoke 16. By this, the adsorption surface 34 is mechanically worked without affected by the permanent magnet 18. Further, by changing the entire magnetic characteristics of the adjustment member 20, permeance of a magnetic gap 12 is adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic attraction holding device that uses a permanent magnet and an electromagnet to magnetically attract and hold a magnetic material in a releasable manner.

[0002]

2. Description of the Related Art As an apparatus for repeatedly adsorbing and releasing a magnetic substance, a cup-shaped yoke, an iron core defining a suction surface for adsorbing the magnetic substance in cooperation with the yoke, and a yoke in the yoke are provided. There is a magnetic attraction holding device including one or more permanent magnets disposed between the yoke and the iron core, and an excitation coil for applying a magnetic field to the iron core to selectively switch the attracting surface between an excited state and a non-excited state ( For example,
9-164216, JP-A-2-261179).

In this type of magnetic attraction holding device, the iron core has a flange, and the yoke is formed so as to form a magnetic gap between the outer peripheral surface of the flange and the inner peripheral surface of the yoke. Is located within. In such a magnetic attraction holding device, generally, after all the assembly is completed, and after the space is filled with the synthetic resin (that is, finally), machining is performed to make the attraction surface the same flat surface. Will be

When an alnico magnet material or a ferrite magnet material is used as a permanent magnet material in this type of magnetic attraction holding device, it is necessary to assemble the magnet before magnetizing such permanent magnet material and machine the attraction surface. Can be.

However, when a rare earth metal magnet material is used as the permanent magnet material, the holding power of the rare earth metal magnet itself is very large, so that when magnetized, a magnetic field that is several times larger than that of the ferrite magnet material is generated. Without acting on the material, the magnet material will not be uniformly magnetized. For this reason, when a rare earth metal magnet material is used, in order to uniformly magnetize the magnet material after assembling the device, a large magnetic field is applied to the device after the assembly is completed in consideration of the magnetic field passing through the magnetic material other than the magnet material. Must be acted upon.

Therefore, when a rare earth metal magnet material is used, a manufacturing method in which the magnet material is magnetized after the completion of the assembly of the apparatus and the processing of the suction surface cannot be adopted, and the magnetized magnet material cannot be adopted. Must be used to assemble the device and machine the suction surface.

However, if a magnet material that has been magnetized in advance is used, a strong magnetic force is generated on the attracting surface after assembly. If the machine for the attracting surface is machined in this state, cutting waste generated during machining is generated. In addition, magnetic powder such as grinding dust is adsorbed on the adsorption surface, and the adsorption surface cannot be finished precisely.

Further, the magnetic attraction holding device using the cup-shaped yoke has a structure in which it is difficult to adjust the permeance of the magnetic gap between the flange portion and the yoke during assembly or after machining, so that the material used is Due to magnetic variations, variations in processing accuracy of parts, and the like, there are cases where the attracting surface cannot be completely de-energized even when a predetermined excitation current is supplied to the excitation coil.

[0009]

SUMMARY OF THE INVENTION It is an object of the present invention to process an attraction surface without applying a magnetic force even when a magnet material magnetized in advance is used, and to adjust the permeance of a magnetic gap at the time of assembly. It is to make the structure that can be.

[0010]

A magnetic attraction holding device according to the present invention comprises an electromagnet assembly having a magnetic attraction surface at one end, a yoke assembled at the other end of the electromagnet assembly, and an electromagnet assembly and yoke. One or more permanent magnets disposed therebetween. The electromagnet assembly has a cylindrical member magnetically connected to the yoke, and an iron core disposed in the cylindrical member, the cylindrical member having one end forming an attraction surface in cooperation with the cylindrical member. An iron core is provided between the cylindrical member and the iron core to cooperate to form a magnetic air gap, and an excitation coil is provided between the cylindrical member and the iron core to selectively switch the attracting surface between an excited state and a non-excited state.
The permanent magnet has one magnetic pole magnetically connected to the yoke and the other magnetic pole connected to the other end of the iron core.

If the electromagnet assembly, the yoke, and the permanent magnet are separate and independent members, they can be separately manufactured and then assembled into a magnetic attraction holding device. For this reason, the attraction surface can be machined without being affected by the permanent magnet. Further, the permeance of the magnetic gap can be adjusted when assembling the magnetic suction holding device.

As described above, according to the present invention, the electromagnet assembly is divided into the yoke and the permanent magnet, and the yoke is opposite to the attraction surface of the electromagnet assembly in a state where the permanent magnet is magnetically connected to the iron core and the yoke. Because it is assembled on the side, the suction surface can be processed in a state where magnetic force does not reach it,
The permeance of the magnetic air gap can be adjusted during assembly into the device.

[0013] Further, it may include an adjusting member made of a magnetic material disposed on the electromagnet assembly or the yoke for adjusting the permeance of the magnetic air gap. In this case, the adjusting member may be arranged in the magnetic gap, or may be arranged in the yoke so that the amount of protrusion into the magnetic gap can be adjusted.

In the former case, the permeance of the magnetic air gap is adjusted by changing the adjusting member to a member having different magnetic characteristics or dimensions and adjusting the total magnetic characteristics of the adjusting member in the magnetic air gap. Can be. In the latter case, the permeance of the magnetic gap can be adjusted by adjusting the amount of the adjustment member projecting into the magnetic gap.

The yoke can be assembled to the electromagnet assembly by one or more screw members. The iron core has a flange portion at the other end that forms a magnetic gap in cooperation with the cylindrical member,
Further, the core member can be maintained at the center in the axial direction of the cylindrical member by the core supporting member disposed between the cylindrical member and the iron core.

In a preferred embodiment, the yoke comprises a plate-like member having a recess in which a permanent magnet is arranged, the plate-like member being magnetically connected to the other end surface of the tubular member and the permanent magnet.

In another preferred embodiment, the yoke includes a plate-like member disposed inside the other end of the tubular member, and the plate-like member is magnetically attached to the inner surface of the other end of the tubular member and the permanent magnet. Connected.

In still another preferred embodiment, the yoke includes a tubular member connected to the other end of the tubular member, and a plate-shaped member disposed in the tubular member. And the plate-shaped member is magnetically connected to the inner surface of the cylindrical body and the permanent magnet.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a magnetic attraction holding device 10 includes an electromagnet assembly 14 having a magnetic gap 12 therein, and a yoke 1 attached to the electromagnet assembly 14.
6, one or more permanent magnets 18 disposed between the electromagnet assembly 14 and the yoke 16, and an adjustment member 20 made of a magnetic material for adjusting the permeance of the magnetic air gap 12.

In the electromagnet assembly 14, an iron core 24 is disposed inside a cylindrical member 22 formed of a magnetic material in a cylindrical shape, and an exciting coil 26 is disposed between the cylindrical member 22 and the iron core 24. 24 is maintained at a predetermined position on the cylindrical member 22 by an annular core support member 28. These members are integrally connected by a synthetic resin 30 filled in a space below the support member 28.

The iron core 24 has an axial length substantially the same as the axial length of the cylindrical member 22. One end of the iron core 24 forms a magnetic attracting surface 34 for releasably attracting the magnetic body 32 in cooperation with one end of the tubular member 22. Iron core 2
4 has an outward flange portion 36 on the outer periphery of the other end. The outer peripheral surface of the flange portion 36 is formed so that the magnetic gap 12 is formed in the cylindrical member 2.
2 and is formed in cooperation with the upper inner surface.

The exciting coil 26 is arranged substantially at the center of the iron core 24 in the axial direction. The supply of power to the excitation coil 24 is performed via a cable 38. The cable 38 is attached to the tubular member 22 by a fixture 40.

The yoke 16 is formed in a plate shape from a magnetic material. The yoke 16 has a shallow recess 42 formed on one side for accommodating the permanent magnet 18, and a screw hole 44 opened on the other side and extending in the thickness direction.

The yoke 16 is connected to the attraction surface 34 of the electromagnet assembly 14 with one or more screw members 46 penetrating the yoke 16 in the thickness direction, with the recess 42 facing the electromagnet assembly 14. Installed on the other side. Thereby, the yoke 16 is magnetically connected to the end face of the tubular member 22 and forms a cup-shaped case in cooperation with the tubular member 22. The screw member 46 is screwed to the flange 36 of the iron core 24.

The permanent magnet 18 is formed in a plate shape from a rare earth metal magnet material having a high coercive force, and is magnetized in the thickness direction. The permanent magnet 18 is disposed in the recess 42 of the yoke 16 such that one magnetic pole surface is in contact with the iron core 24 and the other magnetic pole surface is in contact with the yoke 16.

As long as the magnetic pole surface of the permanent magnet 18 is magnetically connected to the iron core 24 and the yoke 16, the magnetic pole surface does not need to directly contact the iron core 24 and the yoke 16.
The permanent magnet 18 may be made from an alnico magnet material or a ferrite magnet material.

The adjusting member 20 is formed of a magnetic material in an annular shape, and is disposed between the inner surface of the upper portion of the tubular member 22 and the outer surface of the flange portion 34. Magnetic gap 1
The permeance of No. 2 is obtained by changing the adjusting member 20 to a member having a different size such as a cross-sectional area or a different material such as a magnetic characteristic, and changing the total magnetic characteristic of the adjusting member 20 in the magnetic gap 12. Can be adjusted.

The magnetic attraction holding device 10 includes the electromagnet assembly 1
4, the yoke 16, the permanent magnet 18, and the adjusting member 20 are separately manufactured and assembled as shown in the drawing, whereby the magnetic attraction holding device can be assembled. Therefore, the assembling surface 34 can be machined without being subjected to the action of the permanent magnet before being assembled to the magnetic attraction holding device 10. Further, the permeance of the magnetic gap 12 can be adjusted when the yoke 16 is assembled to the electromagnet assembly 14.

The magnetic attraction holding device 10 includes a magnetic gap 12.
Depending on the magnitude of the permeance, one of two usages can be employed. The attracting surface 34 determines whether or not the exciting current is supplied to the exciting coil 26, and by reversing the direction of the exciting current supplied to the exciting coil 26, an exciting state in which the magnetic body 32 can be attracted, Can be selectively switched to a non-excited state in which it can be released.

In a first use method in which the permeance of the magnetic gap 12 is adjusted to a relatively small value and used, the magnetic body 32 is attracted to the attracting surface 34 in a state where the exciting coil 26 is not energized, and the exciting coil 26 This is a method of releasing the magnetic body 32 by energizing the magnetic material 32.

In the case of the first usage, the magnetic flux of the permanent magnet 18 is applied to the attraction surface 3 when the excitation coil 26 is not energized.
4, the attracting surface 34 is in the excited state. On the other hand, the direction of the magnetic flux from the electromagnet assembly 14 is
When the exciting current is supplied to the exciting coil 26 in a direction opposite to the direction of the magnetic flux from the magnet, the magnetic flux of the permanent magnet 18 and the magnetic flux of the electromagnet assembly 14 going through the attracting surface 34 are in the opposite directions. The suction surface 34 is in a non-excited state.

A second use in which the permeance of the magnetic air gap 12 is adjusted to a relatively large value and used is to excite an exciting current in the opposite direction when the attracting surface is in the excited state and when it is in the non-excited state. This is a method of supplying to the coil 26.

In a second use, the electromagnet assembly 14
When an exciting current is supplied to the exciting coil 26 so that the direction of the magnetic flux from the magnet becomes the same as the direction of the magnetic flux from the permanent magnet 18, the magnetic flux of the permanent magnet 18 passing through the adsorption / adsorption surface 34 and the magnetic flux of the electromagnet assembly 14 Since the direction of the magnetic flux is the same as that of the magnetic flux, the attracting surface 34 is in an excited state. On the other hand, when an exciting current is supplied to the exciting coil 26 such that the direction of the magnetic flux from the electromagnet assembly 14 is opposite to the direction of the magnetic flux from the permanent magnet 18, the permanent magnet 18 Since the magnetic flux and the magnetic flux of the electromagnet assembly 14 are in opposite directions, the attracting surface 34 is in a non-excited state.

A first use method in which the magnetic gap 12 has a relatively small permeance is that when the excitation coil 26 is not energized (when the adsorption surface is in the excited state), the adsorption force of the adsorption surface is large, Excitation current and power for keeping the non-excited state of 34 increase. Therefore, the amount of electric power when the attraction surface 34 is maintained in the non-excitation state for a long time or frequently is increased.

On the other hand, the second use method in which the permeance of the magnetic air gap 12 is relatively large is that the attraction force of the attraction surface when the excitation coil 26 is not energized is small, but the attraction surface is in a non-excitation state. Since the attracting surface is kept in the excited state by supplying the exciting coil with the exciting current having the same magnitude as the exciting current of the opposite direction to the exciting coil, the attracting force of the attracting surface at that time increases.

When the exciting current value in the second use is set to one half of the exciting current in the first use, if both exciting coils are the same, the second
In the method of (1), the excitation voltage may be one-half that of the first usage, and the power consumption in the second usage may be one-fourth of that of the first usage. For this reason, the energization time in the second usage is four times that in the first usage.
If less than twice, the amount of power used in the second usage is the first
Is smaller than in the usage of

Further, in the case of an apparatus having a relatively large permeance of the magnetic air gap 12 such as the apparatus used in the second utilization method, when the attracting surface is kept in the excited state, the excitation current is not supplied to the exciting coil. There is also a usage.

In the third usage, the exciting coil 26
Although the suction force of the suction surface when the power is not supplied (when the suction surface is in the excited state) is small, the power consumption is smaller than in the first and second usage methods. Therefore, in the case of a device in which the permeance of the magnetic gap 12 is relatively large, the second or third use method can be adopted depending on the required attraction force.

The magnetic attraction holding device 10 is, as described above,
In consideration of the electric power and the amount of electric power under the use condition, the magnetic gap 12 is set so that the attracting surface 34 is completely de-energized.
Is adjusted to complete the device for the first use or the device for the second or third use. The use of a small amount of power consumption not only saves energy but also prevents the occurrence of trouble due to a rise in the temperature of the apparatus.

Referring to FIG. 2, the magnetic attraction holding device 50
Is that the length of the cylindrical member 54 of the electromagnet assembly 52 is made larger than that of the iron core 24, the flat yoke 56 is disposed inside the upper end of the cylindrical member 54, and the yoke 56 is connected to the cylindrical member 5.
4 is magnetically connected to the upper inner surface.

The magnetic gap 12 is formed by the outer peripheral surface of the flange portion 36 and the inner surface of the corresponding portion of the tubular member 54. The yoke 56 has no recess for accommodating the permanent magnet 18. However, the permanent magnet 18 is disposed between the iron core 24 and the yoke 56.

The magnetic attraction holding device 50 has the same functions and effects as the magnetic attraction holding device 10. Therefore,
The magnetic attraction holding device 50 is completed as a device for the first, second or third use by adjusting the permeance of the magnetic gap 12 during assembly.

Referring to FIG. 3, the magnetic attraction holding device 60
Uses the same electromagnet assembly 14 and permanent magnet 18 as device 10 shown in FIG. 1, but uses a yoke 62 and adjustment member 64 that are different from yoke 16 and adjustment member 20 of device 10.

The yoke 62 includes a cylindrical member 66 made of a magnetic material and connected to the other end of the cylindrical member 22, and a plate member 68 made of a magnetic material disposed in the cylindrical member 66. The tubular body 66 is magnetically connected to the other end surface of the tubular member 22,
Is magnetically connected to the inner surface of the cylindrical body 66 and the permanent magnet 18.

The plate-shaped body 68 has a notch 70 continuous with the lower periphery thereof, and the cylindrical body 66 has a plurality of holes 72 communicating with the notch 70 at the lower part. The notch 70 forms a space between the cylindrical body 66 and the plate-like body 68 having a width substantially equal to the width of the magnetic gap 12 in the radial direction. For this reason, the lower part of the plate-shaped body 68 is
Has the same outer dimensions as the outer dimensions of. The holes 72 are elongated holes extending in the axial direction of the device 60, and are arranged at equal angular intervals around the axis of the device 60.

The adjusting member 64 is formed as a band-shaped ring from a band-shaped member made of a magnetic material having a rectangular cross-sectional shape. The adjusting member 64 is disposed in the notch 70 so as to be able to enter and exit the magnetic gap 12. Further, the adjusting member 64 has a plate-like shape in which the amount of protrusion into the magnetic gap 12 can be adjusted by a set screw 74 at a portion corresponding to each hole 72. Attached to body 68.

In the magnetic attraction holding device 60, the permeance of the magnetic gap 12 can be adjusted by adjusting the amount of the adjustment member 64 protruding into the magnetic gap 12. This adjustment can be performed using the hole 72 even after the completion of the device without separating the yoke 62 from the electromagnet assembly 14.

As a result, according to the device 60, any of the above-described first, second and third uses can be adopted, and when a predetermined exciting current is supplied to the exciting coil, The permeance of the magnetic air gap 12 can be adjusted so that the surface 34 is completely de-energized.

Referring to FIG. 4, the magnetic attraction holding device 80
As the cylindrical member 84 of the electromagnet assembly 82, a member obtained by integrating the cylindrical member 22 and the cylindrical body 66 in the device 60 shown in FIG. 3 is used, and as the yoke 86, the device 60 shown in FIG.
A member having the same shape as that of the plate-shaped member 68 is used. Further, the device 80 uses the same adjustment member 64 as the adjustment member in the device 60 shown in FIG.

The cylindrical member 84 of the electromagnet assembly 82 has a plurality of holes 72 communicating with the notches 70 formed on the outer periphery of the lower part of the yoke 86 at the upper part. The adjusting member 64 is disposed in the notch 70 so as to be able to enter and exit the magnetic gap 12, and the yoke 86 is capable of adjusting the amount of protrusion into the magnetic gap 12 by a set screw 74 at a position corresponding to each hole 72. Attached to.

The magnetic attraction holding device 80 also has the magnetic air gap 12
The permeance of the magnetic gap 12 can be adjusted by adjusting the amount of the adjustment member 64 protruding from the magnetic gap 12. This adjustment can be performed using the hole 72 without separating the yoke 86 from the electromagnet assembly 82 even after the device is completed.

Therefore, according to the device 80, any of the above-described first, second and third uses can be adopted, and when the predetermined exciting current is supplied to the exciting coil, the attracting surface 34 is The permeance of the magnetic air gap 12 can be adjusted so as to be completely de-energized.

In each of the above embodiments, each member formed of a magnetic material and acting as a magnetic path is manufactured from a ferromagnetic material.

The present invention is not limited to the above embodiment. For example, the cylindrical member of the electromagnet assembly may be a polygonal cylindrical shape.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of a magnetic attraction holding device according to the present invention.

FIG. 2 is a longitudinal sectional view showing a second embodiment of the magnetic attraction holding device of the present invention.

FIG. 3 is a longitudinal sectional view showing a third embodiment of the magnetic attraction holding device of the present invention.

FIG. 4 is a longitudinal sectional view showing a fourth embodiment of the magnetic attraction holding device of the present invention.

[Explanation of symbols]

 10, 50, 60, 80 Magnetic attraction holding device 12 Magnetic gap 14, 52, 82 Electromagnet assembly 16, 56, 62, 86 Yoke 18 Permanent magnet 20, 64 Adjusting member 22, 54, 84 Tubular member 24 Iron core 26 Excitation coil 28 Support member 30 Synthetic resin 32 Magnetic material 34 Magnetically attracting surface 36 Flange 38 Cable 40 Mounting tool 42 Recess 44 Screw hole 46 Screw member 72 Hole 74 Set screw

Claims (5)

[Claims] 1. An electromagnet assembly having a magnetic attraction surface at one end, a yoke assembled at the other end of the electromagnet assembly, and one or more permanent magnets disposed between the electromagnet assembly and the yoke. A magnet member, the electromagnet assembly is a cylindrical member magnetically connected to the yoke, and an iron core disposed in the cylindrical member. An iron core having one end to be formed and forming a magnetic gap in cooperation with the cylindrical member; and being disposed between the cylindrical member and the iron core, the attraction surface is selectively switched between an excited state and a non-excited state. A permanent magnet, wherein one of the magnetic poles is magnetically connected to the yoke and the other magnetic pole is magnetically connected to the other end of the iron core, respectively. 2. The magnetic attraction holding device according to claim 1, further comprising an adjusting member made of a magnetic material disposed on the electromagnet assembly or the yoke to adjust the permeance of the magnetic air gap. 3. The magnetic attraction holding device according to claim 2, wherein the adjusting member is disposed in the magnetic gap. 4. The yoke according to claim 2, wherein the adjusting member is arranged on the yoke so as to adjust an amount of protrusion into the magnetic gap.
3. The magnetic attraction holding device according to item 1. 5. The magnetic attraction holding device according to claim 1, wherein the yoke is assembled to the electromagnet assembly by one or more screw members.