JPH0435343Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an electromagnetically controlled magnetic holder that is a combination of a permanent magnetic holder and an electromagnetic holder.

[Conventional technology]

Among these cages, permanent magnetic cages are magnetically ON.
-Since it cannot be turned off, the only way to remove a workpiece that has been sucked is to apply mechanical force and push it up. Therefore, it is difficult to use it as a holder for the hand of an industrial robot. On the other hand, electromagnetic retainers are conventional pneumatic retainers.
It is attracting attention as an alternative to hydraulic and electric gripping tools.

Although this electromagnetic type is limited in that it can only hold magnetic materials, it is mechanically simpler and cheaper to construct than other mechanical holders, and it is difficult to hold objects that have been punched out using a press or the like using any method other than magnets. This is because it is difficult to hold a thin object by using some kind of member, and because the vacuum hole is in the way, it is difficult to hold the thin object.

Therefore, cages using magnetism are expected to be widely used in the future.

[Problem that the invention attempts to solve]

A disadvantage of this electromagnetic magnetic holder is that it may not be possible to remove it due to residual magnetism when changing from the attracted state to the released state, and as a countermeasure to this problem, devices equipped with a spring-based release mechanism have been considered.

An object of the present invention is to provide a magnetic suction tool that is easy to remove despite its strong suction force and is free from the risk of losing its suction force during a power outage.

[Means for solving problems]

In order to achieve the above objective, in the present invention, a polarity converting magnet is fixed between the intermediate core and the side plate between the base plate and the intermediate core in a magnetic circuit composed of a base plate made of magnetic material, an intermediate core, and a side plate. This invention provides an electromagnetically controlled magnetic holder comprising a magnet and a magnetizing coil around the polarity changing magnet.

[Effect]

The polarity changing magnet is magnetized by the magnetic field generated by the magnetizing coil in accordance with the applied current, and cooperates with the magnetic field generated by the fixed magnet to attract the object, and also cancels the magnetic field to release the object. The current applied to the magnetizing coil may be pulsed, and is applied each time an object is attracted or released.

[Effect of idea]

As described above, this invention has a magnetic holder constructed by combining a fixed magnet and a polarity changing magnet with a magnetizing coil on the base plate, intermediate core, and side plate, so it has a large attraction force while releasing the object. It is possible to provide an electromagnetically controlled magnetic holder that is easy to use and does not lose its adsorption force during a power outage.

〔Example〕

Figures 1a, b, c, d, and e are a front sectional view, a top view, a bottom view, a side view, and a rear view of an embodiment of the present invention. As shown in this figure, a base plate 1 is arranged so as to occupy the upper half of the side plate 2, a polarity changing magnet 4 is arranged at the bottom of this base plate 1, and an intermediate iron core 3 is arranged further below. There is. A fixed magnet 5 is arranged between the intermediate core 3 and the side plate 2, and a resin filler 7 is provided in the gap at the lower end of the fixed magnet 5. A magnetizing coil 6 is provided around the polarity changing magnet 4, and a current is supplied to the magnetizing coil 6 through a lead wire 8. The polarity changing magnet 4 is suitably a magnet with a relatively small coercive force, such as an alnico magnet, and is magnetized with a polarity according to the direction of the current by passing a pulse current through the magnetizing coil 6. Further, as the fixed magnet 5, a magnet with a large coercive force, such as a ferrite magnet or a rare earth magnet, is used.

Assume now that the polarity changing magnet 4 is magnetized with S on the upper side and N on the lower side in the figure. In this case, in the intermediate core 3, the magnetic flux generated by the polarity changing magnet 4 and the fixed magnet 5 is directed from the lower end in the figure to the side plate 2 via an object (not shown), with some of the flux flowing towards the fixed magnet 5 and the rest towards the base plate 1. It returns to the polarity changing magnet 4 via the polarity converting magnet 4. This is the adsorption state.

Next, when a current in the opposite direction is passed through the magnetizing coil 6, the polarity converting magnet 4 is magnetized so that the upper side is N and the lower side is S, as shown in parentheses in the figure. In this case, the polarity changing magnet 4 and the fixed magnet 5 form a closed magnetic path together with the base plate 1, intermediate iron core 3, and side plate 2. Therefore, the magnetic flux generated by these magnets 4 and 5 does not go outside and remains inside the holder. This is the state of release.

Figures 2a, b, c, and d and Figures 3a and b show other embodiments of the present invention, which, unlike the embodiment of Figure 1, have a concentric multipolar configuration. FIG. 2 shows the OFF state, and FIG. 3 shows the ON state. The same numerals in the figures as in FIG. 1 indicate the same elements, and where an element is composed of a plurality of parts, subscripts are used to indicate each part. As can be seen from this figure, the intermediate core 3 consists of parts 3a and 3b, the polarity changing magnet 4 also consists of parts 4a and 4b, the fixed magnet 5 also consists of parts 5a and 5b, and the magnetizing coil 6 also consists of parts 6a and 6b. Become.
Each of these parts is arranged to form concentric circles. In particular, fixed magnet 5 is element 5
Three or four sectors are combined to form a or 5b in a ring shape.

In this embodiment, by applying a current to the magnetizing coil 6, the polarity changing magnet 4 is magnetized so that the upper side of the portion 4a and the lower side of the portion 4b of the polarity changing magnet 4 become N as shown in FIG. 2a. The magnetic fluxes generated by the fixed magnets 5 only pass through the inside of the holder and do not go outside.

Further, as shown in FIG. 3a, when the polarity changing magnet 4 is magnetized so that the upper side of the portion 4a and the lower side of the portion 4b are N, the polarity changing magnet 4 and the fixed magnet 5 are magnetized.
The generated magnetic fluxes act together on the magnetic pole surface.

According to this embodiment, since the magnetic poles are divided in the diametrical direction, it is possible to accommodate various surface shapes of objects.

[Brief explanation of the drawing]

Figures 1 a, b, c, d, and e are a front sectional view, top view, bottom view, side view, and rear view of one embodiment of the present invention, and Figures 2 a, b, c, and d are the same. These are a front sectional view, a top view, a bottom view, and a cross sectional view showing the ON state of the embodiment, in which figure a is a sectional view taken along line A-A in figure b, and figure d is a cross-sectional view taken along line A-A in figure a. A cross-sectional view taken along the line B, FIGS. 3A and 3B are a front cross-sectional view showing the OFF state of another embodiment, and a cross-sectional view taken along the line CC. 1...Bed plate, 2...Side plate, 3...Intermediate core,
4... Polarity conversion magnet, 5... Fixed magnet, 6... Magnetizing coil, 7... Filling material, 8... Lead wire.

Claims (1)

[Claims for Utility Model Registration] 1. A comparative device with a base plate disposed at one end of a cylindrical side plate, an intermediate core disposed at the other end, and a magnetizing coil attached between the base plate and the intermediate core. An electromagnetically controlled magnetic holder comprising a polarity changing magnet with a small coercive force and a fixed magnet with a large coercive force arranged between the intermediate iron core and the side plate. 2 Utility Model Registration In the electromagnetically controlled magnetic holder according to claim 1, the intermediate core, the polarity changing magnet, and the fixed magnet are each divided into at least two parts and arranged concentrically. retainer.