JPH056315Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to the structure of a movable yoke-type lifting magnet that lifts an uneven workpiece by electromagnetic force.

[Prior art] As a prior art related to the present invention,
Publication No. 122279 is known. In the conveying electromagnet disclosed in the present invention, a movable yoke (an iron piece for attraction) that attracts a workpiece is movable along an excitation core and a guide attached to the excitation core, and the movable yoke (adsorption iron piece) that attracts a workpiece is movable along an excitation core and a guide attached to the excitation core. On at least one of the guide sides,
A biasing device is provided that biases the movable yoke toward the guide side.

In such a conveying electromagnet, just before the movable yoke contacts the workpiece, a biasing device blows out compressed air toward the movable yoke, so the influence of residual magnetism is eliminated, and the movable yoke moves toward the excitation core. Each movable yoke takes a posture that adapts to the suction surface of the workpiece, even if the workpiece is separated from the workpiece and has an uneven surface.

However, even with such a magnet device having a movable yoke, when trying to attract and convey a workpiece with a three-dimensional steep slope and large irregularities at high speed, it is difficult for the movable yoke to follow the workpiece attraction surface. Problems arise in that the work is not carried out smoothly and the workpiece is deformed and damaged.

Therefore, a movable yoke-type lifting magnet was first proposed in the present application, which can smoothly lower a movable yoke without being affected by the shape of the workpiece and prevent deformation and damage to the workpiece due to contact with the movable yoke. (Jitsugan No. 62-97361).

This movable yoke type lifting magnet is
In a movable yoke-type lifting magnet, in which a movable yoke that attracts a workpiece is movable up and down relative to a magnet that is excited by electricity, the movable yoke is raised and lowered on a frame attached to the magnet side. The movable yoke is provided with an elevating means and is engaged with the elevating means so as to be able to descend under its own weight.

In such a movable yoke type lifting magnet, when lifting a work, the magnet is brought close to the work, and then the movable yoke is lowered by the lifting means. Since the movable yoke is engaged with the elevating means so as to be able to descend under its own weight, it comes into contact with the workpiece under its own weight. That is, the relative positions of the magnet and the workpiece are fixed, and only the movable yoke is lowered by its own weight as the lifting means moves. Therefore, even if the workpiece has large irregularities or a steeply sloped surface, the movable yoke can move smoothly and follow the workpiece better. Therefore, no excessive force is applied to the workpiece, and deformation and damage to the workpiece are prevented.

By the way, the electromagnetic magnet bodies used in these devices are specially designed depending on the object to be used. Therefore, the electromagnetic magnet bodies used in automobile production lines, for example, come in a wide variety of lengths, ranging from small ones to large ones, with lengths ranging from 180 mm to 1300 mm. These electromagnetic magnets contain from several to a dozen excitation coils.

[Problems to be solved by the invention] However, if even one of the excitation coils in the electromagnetic magnet body of such a movable yoke type lifting magnet burns out or breaks, the attraction capacity of that part will be lost. As the electromagnetic magnets wear out, the electromagnetic magnets must be replaced. However, since each electromagnetic magnet is specially designed, it is not compatible with other electromagnets, so repairs can be made by replacing the electromagnetic magnet. It is not possible to respond to

Therefore, in case of electromagnetic failure,
The device itself must be repaired, but in this case, the excitation coil must be rewinded, requiring a large amount of repair and maintenance man-hours, and the production line must be stopped for a long time. what if,
Even if you have spare parts, each electromagnetic magnet body is specially designed, so the price of the electromagnetic magnet body is very high, and having spare parts for all of them will result in high maintenance costs. It will be huge.

The present invention focuses on the above-mentioned problems and has developed a movable yoke-type lifting magnet that allows the electromagnetic magnet main body to be quickly replaced even if the electromagnetic magnet main body breaks down, and also allows the number of spare parts to be kept to a minimum. The purpose is to provide

[Means for solving the problem] The movable yoke type lifting magnet of the present invention, which meets this purpose, has a movable yoke that attracts a workpiece that moves vertically with respect to the electromagnetic magnet body that is excited by electricity. In the movable yoke type lifting magnet, the electromagnetic magnet main body is composed of a plurality of standard electromagnetic magnets that are separable and compatible, and a frame on which each of the standard electromagnetic magnets is supported and each of the standard electromagnetic magnets are separated. The standard electromagnetic magnet is formed with a positioning means for positioning the standard electromagnetic magnet with respect to the frame.

[Function] In the movable yoke type lifting magnet constructed as described above, the electromagnetic magnet main body is composed of a plurality of standard magnets, so if one of the standard electromagnetic magnets breaks down, it can be replaced with a normal one. You can exchange it with . In other words, since standard magnets are compatible, standard magnets kept as spare parts can be used as they are. Since a malfunctioning standard magnet can be reused after being repaired, it is only necessary to keep the number of spare parts in stock based on the failure rate. Maintenance costs can be significantly reduced compared to conventional methods.

In addition, by forming positioning means on the standard electromagnetic magnet and the frame that holds the standard electromagnetic magnet, it becomes easier to replace the standard electromagnetic magnet on-site, reducing repair time, that is, production line stoppage time. be able to.

[Embodiments] Hereinafter, preferred embodiments of the movable yoke type lifting magnet according to the present invention will be described with reference to the drawings.

First Embodiment FIGS. 1 and 2 show a movable yoke type lifting magnet according to a first embodiment of the present invention. In the figure, reference numeral 1 indicates a movable yoke type lifting magnet, and reference numeral 2 indicates a workpiece to be lifted by the movable yoke type lifting magnet 1. The workpiece 2 is made of, for example, an iron beam whose upper surface is formed into an inclined surface and which is curved in a waveform in the longitudinal direction.

The movable yoke type lifting magnet 1 includes an electromagnetic magnet main body 3 that is excited by energization,
a frame 4 that supports the electromagnetic magnet body 3;
It is composed of a plurality of movable yokes 5 that are attracted to the electromagnetic magnet main body 3, and a movable yoke support 6 that holds the movable yokes 5 so as to be movable in the vertical direction.

The electromagnetic magnet main body 3 is composed of a plurality of standard electromagnetic magnets 7 that are separable and compatible. The standard electromagnet 7 consists of an iron core and an excitation coil (not shown), and the excitation coil is connected to a power source by a wiring 9. The frame 4 is attached to the upper surface of the electromagnetic magnet main body 3, and is formed, for example, in a gate shape. That is, each standard electromagnetic magnet 7 is suspended from the lower surface of the frame 4 by a bolt 10.

The movable yoke supports 6 are attached to both sides of each standard electromagnetic magnet 7, respectively. The movable yoke support 6 is composed of an outer support 6a, a slide plate 6b, and a bracket 6c, and the slide plate 6b is directly attached to the side surface of the standard electromagnetic magnet 7. The outer support 6a is connected to the slide plate 6 by brackets 6c placed on both sides of the standard electromagnetic magnet 7.
It is arranged at a predetermined interval from b. A plurality of movable yokes 5 are inserted between the outer support 6a and the slide plate 6b, and the movable yokes 5 are held movably in the vertical direction. A stopper 5a is formed at the upper end of the movable yoke 5 and can come into contact with an outer support 6a that projects outward. Movable yoke 5
is adapted to be attracted to the side surface of each standard electromagnetic magnet 7 when the standard electromagnetic magnet 7 is energized. The cross-sectional shape of the movable yoke 5 is trapezoidal as shown in FIG. 3, and the lower end has a small cross-sectional area in order to concentrate the magnetic flux and increase the magnetic force. In this way, in this embodiment, the standard electromagnetic magnet 7 and the movable yoke 5 are combined as a set.

The reason why the movable yokes 5 have a trapezoidal cross-sectional shape is to reduce the contact area between the movable yokes 5 and reduce the sliding resistance. This is to prevent the movable yokes from malfunctioning by causing the movable yokes to fall from the gap between the movable yokes 5.

Keyways 4b and 7b are formed in the lower surface 4a of the frame 4 and the upper surface 7a of each standard electromagnetic magnet 7 as positioning means for positioning each standard electromagnetic magnet 7 with respect to the frame 4.
The keyway 4b is a linear groove extending in the longitudinal direction of the frame 4, and the cross-sectional shape of the keyway 4b is square. The keyway 7b is a groove provided opposite to the keyway 4b on the frame 4 side, and its cross-sectional shape is similarly quadrangular. Each keyway 4
A key material 8 is fitted in b and 7b, so that each standard electromagnetic magnet 7 is reliably positioned with respect to the frame 4.

Next, the operation in the first embodiment will be explained.

First, moveable yoke type lifting magnet 1
is moved in the horizontal direction by a conveying means (not shown), and the electromagnet main body 3 is positioned directly above the workpiece 2 to be attracted. In this case, all movable yokes 5 are lowered by their own weight. When the horizontal positioning of the electromagnet main body 3 is completed, the frame 4 is lowered by the conveying means, and the movable yoke 5 is moved as shown in FIG.
It is stopped according to the uneven shape of the workpiece 2. That is, each movable yoke 5 assumes a posture that adapts to the suction surface of the workpiece 2.

When the movable yoke 5 comes into contact with the workpiece 2, each standard electromagnetic magnet 7 is excited, and in this state, the movable yoke 5 is attracted to each standard electromagnetic magnet 7 via the slide plate 6b, and the workpiece 2 is attached to the movable yoke 5. It is attracted to the lower end 5b of. When suction of the workpiece 2 is confirmed, the frame 4 is moved by the moving means, and the workpiece 2 is transported to a predetermined position.

When the workpiece 2 is transported to a predetermined position, the excitation of each standard electromagnetic magnet 7 is cut off, and the workpiece 2 immediately separates from the movable yoke 5 and the movable yoke 5 also separates from the standard electromagnetic magnet 7, completing the transport of the workpiece 2. do.

By the way, in such a movable yoke type lifting magnet, the electromagnetic magnet main body 3
It is composed of a plurality of standard electromagnetic magnets 7 that are separable and compatible, so even if one of the plurality of standard electromagnetic magnets 7 fails, the failed one can be replaced with a spare part. be able to. Further, since the standard electromagnetic magnet 7 is formed with a keyway 7b as a positioning means with respect to the frame 4, the standard electromagnetic magnet 7 can be easily replaced on site. Moreover, in this embodiment, since the standard electromagnetic magnet 7 and the movable yoke 5 are assembled as a set, the replacement work is significantly shortened, and the downtime of the production line can be minimized.

Second Embodiment FIG. 3 shows a second embodiment of the present invention.
The second embodiment differs from the first embodiment only in the shape of a part of the movable yoke; other parts are similar to the first embodiment, so similar parts are given the same reference numerals as the first embodiment. Therefore, the explanation of the corresponding parts will be omitted, and only the different parts will be explained.
The same applies to other embodiments to be described later.

In FIG. 3, 5 indicates a movable yoke. In the first embodiment, all movable yokes 5 had the same shape, but in this embodiment, the shapes of the lower ends of the movable yokes 5 located at both ends are different. That is, in the first embodiment, since the brackets 6c are located at both ends of each standard electromagnetic magnet 7, it was not possible to provide the movable yoke 5 at both ends of each standard electromagnetic magnet 7, but in this embodiment In this case, this drawback is compensated for by providing extending portions 5c extending in the horizontal direction at the lower ends of the movable yoke 5 located at both ends.

In the second embodiment configured as described above, since the extending portions 5c are provided at the lower ends of the movable yoke 5 at both ends, it is possible to pick up a workpiece located directly below the bracket 6c, thereby increasing the picking capacity.

Third Embodiment FIGS. 4 and 5 show a third embodiment of the present invention. The only difference between this embodiment and the first embodiment is the structure of the movable yoke support, and the other configurations are similar to the first embodiment.

In the figure, reference numeral 11 indicates a movable yoke support that holds the movable yoke 5. Movable yoke support 1
1 is an outer support 11a, a slide plate 1
1b and a bracket 11c. In the first embodiment, the bracket 6c was directly attached to the standard electromagnetic magnet 7, but in this embodiment, the bracket 11c is attached to each standard electromagnetic magnet 7.
It is located between. Bracket 11c is attached to frame 4 with bolts 12. A key groove 11d is formed on the upper surface of the bracket 11c, and a key material 8 is formed in this key groove 11d.
are fitted, and the bracket 11 is connected to the frame 4.
c can be reliably positioned. Further, a spigot 11e into which the end of the standard electromagnetic magnet 7 is fitted is formed in the bracket 11c. The slide plate 11b is attached to the side surface of each standard electromagnetic magnet 7 as in the first embodiment. The outer support 11a is formed in the shape of a strip extending in the longitudinal direction, and is fixed to the end surface of the bracket 11c with bolts 13. Also,
The standard electromagnetic magnet 7 is attached to the frame 4 with bolts 10 as in the first embodiment. That is, in this embodiment, only the standard electromagnetic magnet 7 can be independently taken out by removing the bolt 10.

In the third embodiment configured in this way,
Since the standard electromagnetic magnet 7 and the movable yoke 5 are not assembled as a set as in the first embodiment, if the standard electromagnetic magnet 7 fails, only the standard electromagnetic magnet 7 can be taken out. Therefore, there is no need to keep the movable yoke 5 as a spare part, and maintenance costs can be reduced accordingly.

In addition, in this embodiment, the movable yoke support is not divided and is integrated, so if misalignment occurs in each standard electromagnetic magnet 7, the movement of the movable yoke 5 will deteriorate, but the keyway 11d and pilot By providing 11e these problems are prevented.

Fourth Embodiment FIG. 7 shows a fourth embodiment of the present invention.
This example is similar to the second example, and the third example is similar to the second example.
Only the structure of the movable yoke 5 adjacent to the bracket 11c in the embodiment is partially improved. That is, the lower end portion of the movable yoke 5 is provided with an extension portion 5e that extends in the horizontal direction.

In the fourth embodiment configured in this way, the movable yoke 5 adjacent to the bracket 11c has an extending portion 5e.
is provided, so that 〓 directly below the bracket 11c
The gap can be reduced, and the ability to adsorb the workpiece 2 can be increased.

[Effects of the Invention] As explained above, when using the movable yoke type lifting magnet of the present invention, the electromagnetic magnet main body is composed of a plurality of standard electromagnetic magnets that are separable and compatible. Even if any one of the plurality of standard electromagnetic magnets breaks down, that magnet can be replaced with a spare part. Since broken standard magnets can be reused after being repaired, it is only necessary to keep an appropriate number of spare parts, which significantly reduces maintenance costs compared to keeping all types of electromagnetic magnet bodies as spare parts. can be reduced.

In addition, positioning means for positioning the standard electromagnetic magnet with respect to the frame is formed on the frame supporting each standard electromagnetic magnet and on each standard electromagnetic magnet, so that the work of replacing the standard electromagnetic magnet on site is simplified. This makes it easier and reduces repair time. As a result, the downtime of the production line can be shortened, and the operating rate of the production line can be improved.

Furthermore, by combining standard electromagnetic magnets, it is possible to manufacture lifting magnets of any size, making equipment planning and design extremely easy, and mass production due to standardization can significantly reduce equipment costs. I can do it.

[Brief explanation of drawings]

FIG. 1 shows a cross-sectional view of a movable yoke-type lifting magnet according to the first embodiment of the present invention. The figure on the left is a sectional view of the part where the bracket of the movable yoke support is located, Figure 2 is a front view of the device in Figure 1, and Figure 3 is an enlarged sectional view of the vicinity of the movable yoke in the device in Figure 1. , FIG. 4 is a partially enlarged front view of a movable yoke type lifting magnet according to a second embodiment of the present invention;
FIG. 5 shows a cross-sectional view of a movable yoke-type lifting magnet according to a third embodiment of the present invention. The figure on the left is a sectional view of the part where the bracket of the movable yoke support is located, Figure 6 is a front view of the device in Figure 4, Figure 7 is a bottom view of Figure 5, and Figure 8 is a cross-sectional view of the device of the present invention. FIG. 6 is a partially enlarged front view of a movable yoke type lifting magnet according to a fourth embodiment of the present invention. 1...Movable yoke type lifting magnet,
3... Electromagnetic magnet body, 4... Frame, 4
b, 7b...Keyway as positioning means, 5...
...Movable yoke, 5c, 5e...Extension part, 6, 11
...Movable yoke support, 7...Standard electromagnetic magnet.

Claims (1)

[Scope of utility model registration request] A movable yoke type lifting magnet in which a movable yoke for attracting a workpiece is arranged to be movable in the vertical direction relative to an electromagnetic magnet main body that is excited by the passage of electricity, the electromagnetic magnet main body being composed of a plurality of standard electromagnetic magnets that are separable and interchangeable, and a positioning means for positioning the standard electromagnetic magnet relative to the frame is formed on a frame on which each standard electromagnetic magnet is supported and on each standard electromagnetic magnet.