JPS61155195A - Magnetic sucker - Google Patents

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【発明の詳細な説明】 〔発明の利用分野〕 本発明は磁気吸引力を利用した磁気吸着装置に係り、特
に、磁気吸着面に異物等があっても十分な磁気吸引力が
得られる磁気吸着装置に関する。[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a magnetic attraction device that utilizes magnetic attraction, and particularly to a magnetic attraction device that can obtain sufficient magnetic attraction even if there is a foreign object on the magnetic attraction surface. Regarding equipment.

〔発明の背景〕[Background of the invention]

磁性材である鉄等からなる壁面に磁気吸引力で吸着させ
る方法として、特開昭５２−１１８７５５号公報で提案
されているように、吊上′鑞磁石に複数の揺動磁極を外
極の外側面に沿って配列する構成が知られている。この
方法は、揺動磁極を短冊形状にして移動可能な穴部を設
け、該穴部にピンを通して支承するようにしている。し
かし、揺動磁極には外部から外力が加わらないために鉄
粉やさび等が生じると動きが悪くなり十分な吸引力が得
られない欠点があった。As a method of adhering to a wall made of a magnetic material such as iron using magnetic attraction force, as proposed in Japanese Patent Laid-Open No. 52-118755, a plurality of oscillating magnetic poles are attached to the outer pole of a suspended brazed magnet. A configuration in which they are arranged along the outer surface is known. In this method, the oscillating magnetic pole is made into a rectangular shape, provided with a movable hole, and a pin is passed through the hole for support. However, since no external force is applied to the oscillating magnetic poles from the outside, they have the disadvantage that if iron powder, rust, etc. develop, they become difficult to move and cannot provide sufficient attractive force.

〔発明の目的〕[Purpose of the invention]

本発明は上述の点に鑑み成されたもので、その目的とす
るところは、主鉄心部と可動鉄心部間に塵埃、鉄粉が入
ったシ、あるいはさび等が発生しても可動鉄心部の動き
が悪くならないで十分な磁気吸引力が得られる磁気吸着
装置を提供することにある。The present invention has been made in view of the above-mentioned points, and its purpose is to prevent the movable core from being damaged even if dust, iron powder, or rust occurs between the main core and the movable core. To provide a magnetic attraction device which can obtain sufficient magnetic attraction force without deteriorating the movement of the magnetic attraction device.

〔発明の概要〕[Summary of the invention]

本発明は主鉄心の壁面と可動鉄心部の壁面間に鉄粉、あ
るいはさび等が生じて固渋したような状態になったとし
ても、可動鉄心部と主極鉄心部間に抑圧バネを設けて常
に可動鉄心部に抑圧バネ力が加わるようにすることによ
り、上記目的を達成するように成したものである。The present invention provides a suppressing spring between the movable core and the main pole core even if iron powder or rust is generated between the wall of the main core and the wall of the movable core. The above object is achieved by always applying a suppressing spring force to the movable iron core.

〔発明の実施例〕[Embodiments of the invention]

以下、本発明の一実施例の構成を第１図及び第２図によ
如説明する。第１図及び第２図に示す磁気吸着装置は、
保持部１に磁気回路を構成する主鉄心部２を取付け、主
鉄心部２には環状の空間部を設け、その内部に励磁コイ
ル３を巻装し、その開口部に励磁コイル３を保饅するた
めの遮板４を設けて概略構成される。主鉄心部２は内円
前鉄心２ａ、外円筒鉄心２ｂ、および外径側よシ内径側
の厚みが大きくした円板状の鉄心背部２Ｃからなる。さ
らに、外円筒鉄心２ｂの外周には可動環鉄心５を設け、
可動環鉄心５は外円筒鉄心２ｂの外周に設けた可動環鉄
心係止部６により吸着面からＱ移動距離が制限され、逆
に反吸着面側は外円筒鉄心２ｂの外周に取付けられたバ
ネ支え７と加圧バネ８により可動環鉄心５が吸着面側に
常に加圧される構成になっている。第３図は可動環鉄心
５をピン５ａで支承した場合で、磁気吸着装置の吸着面
が磁性体の壁面９に密着した時に励磁コイル３を励磁し
た時の磁束の流れを示す。この場合の磁束密度は第５図
（イ）に示すように磁気吸着面と壁面間の空隙長ｇがｇ
＝ｏであるから、磁気吸着面の磁束量ＬＢｏとなり、こ
の時の磁気吸引力Ｆｏは吸着面の磁気鉄心部の面積Ｓと
すると次式から求めることができる。Hereinafter, the configuration of an embodiment of the present invention will be explained with reference to FIGS. 1 and 2. The magnetic adsorption device shown in FIGS. 1 and 2 is
A main iron core part 2 constituting a magnetic circuit is attached to the holding part 1, an annular space is provided in the main iron core part 2, an excitation coil 3 is wound inside the annular space, and the excitation coil 3 is inserted into the opening of the annular space. It is roughly configured by providing a shielding plate 4 for the purpose. The main core portion 2 includes an inner circular front core 2a, an outer cylindrical core 2b, and a disk-shaped core back portion 2C that is thicker on the inner diameter side than on the outer diameter side. Furthermore, a movable ring core 5 is provided on the outer periphery of the outer cylindrical core 2b,
The Q movement distance of the movable ring core 5 from the suction surface is limited by a movable ring core locking portion 6 provided on the outer periphery of the outer cylindrical core 2b, and conversely, the Q movement distance of the movable ring core 5 from the suction surface is limited by a spring attached to the outer periphery of the outer cylindrical core 2b. The structure is such that the movable ring core 5 is always pressurized toward the suction surface by the support 7 and the pressure spring 8. FIG. 3 shows the flow of magnetic flux when the excitation coil 3 is excited when the movable ring core 5 is supported by pins 5a and the attraction surface of the magnetic attraction device is in close contact with the wall surface 9 of the magnetic material. The magnetic flux density in this case is as shown in Figure 5 (a) when the gap length g between the magnetic attraction surface and the wall surface is g.
=o, the magnetic flux amount of the magnetic attraction surface is LBo, and the magnetic attraction force Fo at this time can be obtained from the following equation, assuming that the area S of the magnetic core portion of the attraction surface is S.

Ｆｏ＝ＳＢｏ”／２　μｏμｍ この時の磁気吸引力Ｆｏを第５図（ロ）に示す。Fo=SBo”/2　μoμm The magnetic attraction force Fo at this time is shown in FIG. 5(b).

次に、第４図に示すように吸着面と壁面との間に異物１
０が入り、かつ、可動環鉄心が塵埃やさびの発生等で可
動しなくなると平均的な空隙長ｇがｇ　”　ｇ　１　と
なり、励磁コイル４の起磁力が同一であっても碑気抵抗
が大きくなるために磁束量が減少する。この結果、吸着
面の磁気鉄心部の磁束密度Ｂが第５図（イ）に示すよう
にＢ１とな夛、この結果、磁気吸引力ＦがＦｌの値に減
少することになる。これに対し、第１図及び第２図に示
した本発明の構成において、磁気吸着面に異物１０が入
った場合を第６図に示す。本発明の構成で外円筒鉄心２
ｂの吸着面下に異物１０が入ると加圧バネ８で押圧され
ていた可動環鉄心５がさび等によるすペシを阻止しよう
とする力に打勝って外円筒鉄心２ｂの吸着面よ）降下し
て壁面に接触する。Next, as shown in Figure 4, there is a foreign object between the suction surface and the wall surface.
0 and the movable ring iron core becomes immovable due to dust, rust, etc., the average gap length g becomes g '' g 1 , and even if the magnetomotive force of the excitation coil 4 is the same, the monumental resistance increases. As the magnetic flux increases, the amount of magnetic flux decreases.As a result, the magnetic flux density B of the magnetic core portion of the attraction surface increases to B1 as shown in Figure 5 (a), and as a result, the magnetic attraction force F decreases to the value of Fl. On the other hand, in the structure of the present invention shown in FIGS. 1 and 2, a case where a foreign object 10 enters the magnetic attraction surface is shown in FIG. Cylindrical core 2
When a foreign object 10 enters under the suction surface of the outer cylindrical core 2b, the movable ring core 5, which was being pressed by the pressure spring 8, overcomes the force of rust etc. to prevent the foreign matter from falling under the suction surface of the outer cylindrical core 2b. touch the wall.

励磁コイル４の起磁力により、磁気回路には磁束φ鵞が
発生し、異物１０が介在する空間部を通過する磁束が小
さくなるが壁面９からの磁束は可動環鉄心５を介して外
円筒鉄心２ｂ、内円筒鉄心２ａ及び内円前鉄心吸着面側
の空隙（平均的な空隙長ｇ　ｔ”　ｇ　＝　ｇ　ｚ　と
する）を介して壁面９へと閉じた磁気回路で磁束が流れ
る。なお、この時の空隙長ｇ２は第４図に示した場合の
空隙長ｇ１よし小さくなるので、第５図に示した空隙長
と磁束密度および磁気吸引力の関係は空隙長ｇ２に対応
し良値となる。すなわち、可動環鉄心５を加圧バネ８で
押圧して確実に閉じた磁気回路とすることにより、磁束
密度がＢ鵞＞Ｂｔ　となるので磁気吸引力もＦｚ＞Ｆ’
ｌとなる。ここで、磁気吸引力Ｆは磁束密度の２乗に比
例するので、磁気吸引力は急増することになる。Due to the magnetomotive force of the excitation coil 4, a magnetic flux φ is generated in the magnetic circuit, and the magnetic flux passing through the space where the foreign object 10 is present becomes small, but the magnetic flux from the wall surface 9 is transferred to the outer cylindrical core via the movable ring core 5. 2b, magnetic flux flows to the wall surface 9 in a closed magnetic circuit via the inner cylindrical core 2a and the air gap (average gap length g t'' g = g z ) on the adsorption surface side of the inner cylindrical core 2a. At this time, the air gap length g2 is smaller than the air gap length g1 shown in Figure 4, so the relationship between the air gap length, magnetic flux density, and magnetic attraction force shown in Figure 5 corresponds to the air gap length g2, and is a good value. In other words, by pressing the movable ring core 5 with the pressure spring 8 to form a reliably closed magnetic circuit, the magnetic flux density becomes B>Bt, and the magnetic attraction force also becomes Fz>F'.
It becomes l. Here, since the magnetic attraction force F is proportional to the square of the magnetic flux density, the magnetic attraction force increases rapidly.

第７図は磁気吸引力をさらに増加するために、内円前鉄
心２ｍの中心部に柱状空間２ｄを設け、その中に加圧バ
ネ８ａで押圧されて移動可能な可動円柱鉄心５ｂを設け
、さらに吸着面よシ出ないように可動鉄心係止部６ａを
設けた場合を示す。FIG. 7 shows that in order to further increase the magnetic attraction force, a columnar space 2d is provided at the center of the inner circular front core 2m, and a movable cylindrical core 5b that is movable by being pressed by a pressure spring 8a is provided in the space. Furthermore, a case is shown in which a movable core locking portion 6a is provided so as not to protrude from the suction surface.

この場合は、内円筒鉄心２ａ側の空隙長が小さくなり、
この時の平均的な空隙長ｔ”　ｇ　ｓとすると磁束量φ
３がさらに増加してφＧに近くなる。この結果、磁束密
度がＢ３となり、磁気吸引力Ｆ３が磁気吸着面が壁面に
密着した場合の磁気吸引力Ｆｏに近くなり、異物１０の
有無にかかわらず、大きな磁気吸引力を得ることができ
る。In this case, the gap length on the inner cylindrical core 2a side becomes smaller,
If the average air gap length at this time is t” g s, then the amount of magnetic flux φ
3 further increases and becomes closer to φG. As a result, the magnetic flux density becomes B3, the magnetic attraction force F3 becomes close to the magnetic attraction force Fo when the magnetic attraction surface is in close contact with the wall surface, and a large magnetic attraction force can be obtained regardless of the presence or absence of the foreign object 10.

なお、第８図は励磁コイルの代りに永久磁石１１を設け
た場合で、第１図と同様に可動環鉄心を設けた場合の構
成を示した。Note that FIG. 8 shows a configuration in which a permanent magnet 11 is provided in place of the excitation coil, and a movable ring core is provided in the same manner as in FIG.

１　本発明の実施例では可動環鉄心５、および可動円柱
鉄心５ｂを一体構成例を示したが、分割して各可動部が
独立して可動できるように各々に加圧バネを設ける構成
にしても良いことはいうまでもない。1 In the embodiment of the present invention, an example is shown in which the movable ring core 5 and the movable cylindrical core 5b are integrated, but it is also possible to divide them and provide a pressure spring for each movable part so that each movable part can move independently. Needless to say, it's a good thing.

以上の構成にすることによシ、磁気吸着面に異物あるい
は壁面が溶接等で盛シ上っていても可動鉄心部が壁面に
密着することができるので磁気回路の磁束量が減少せず
、磁気吸着面が密着したのとほぼ同様の磁気吸引力を得
ることができる効果がある。また、通常は磁気吸着面と
壁面の空隙を予想して大きめに製作しているのに対し、
本発明では十分な磁気吸引力を維持できるので、磁気吸
着装置として小形軽量化も図ることができる。With the above configuration, even if there is a foreign object on the magnetic attraction surface or the wall surface is raised due to welding or the like, the movable iron core can be in close contact with the wall surface, so the amount of magnetic flux in the magnetic circuit will not decrease. This has the effect of being able to obtain almost the same magnetic attraction force as if the magnetic attraction surfaces were in close contact. In addition, whereas normally the gap between the magnetic attraction surface and the wall surface is anticipated and the size is made larger,
In the present invention, since sufficient magnetic attraction force can be maintained, the magnetic adsorption device can be made smaller and lighter.

〔発明の効果〕〔Effect of the invention〕

以上説明した本発明によれば、磁気吸着装置の磁気回路
を構成する主鉄心に接触して移動できる可動鉄心部を加
圧バネで押圧する構成にしたので、主鉄心吸着面の一部
に異物等が入って、吸着面とた磁気回路を維持すること
ができる。According to the present invention described above, since the movable core part that can move in contact with the main core constituting the magnetic circuit of the magnetic attraction device is pressed by a pressurizing spring, foreign particles may be trapped in a part of the main core attraction surface. etc., to maintain the magnetic circuit between the adsorption surface and the magnetic circuit.

この結果、磁気回路内を通る磁束量が大きい状態で維持
できることになシ、大きな磁気吸引力を得ることができ
る効果がある。As a result, the amount of magnetic flux passing through the magnetic circuit can be maintained in a large state, and a large magnetic attraction force can be obtained.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明の磁気吸着装置の一実施例を示す断面図
、第２図は第１図を吸着面側からみた図、第３図及び第
４図は従来の磁気吸着装置の動作を示す断面図、第５図
（イ）は空隙長と磁束密度の関係を示す特性図、第５図
（ロ）は空隙長と磁気吸引力の関係を示す％付図、第６
図は本発明の一実施例の動作を示す断面図、第７図は本
発明で鉄心の可動を多くした場合の動作を示す断面図、
第８図は本発明の他の例として永久磁石を用いた磁気吸
着装置の断面図である。 ２・・・主鉄心部、２ａ・・・内円筒鉄心、２ｂ・・・
外円筒鉄心、２Ｃ・・・鉄心背部、３・・・励磁コイル
、５・・・可動環鉄心、５ａ、・・・ピン、５ｂ・・・
可動円柱鉄心、８゜８ａ・・・加圧バネ、１１・・・永
久磁石。Fig. 1 is a sectional view showing an embodiment of the magnetic adsorption device of the present invention, Fig. 2 is a view of Fig. 1 viewed from the adsorption surface side, and Figs. 3 and 4 show the operation of the conventional magnetic adsorption device. Figure 5 (a) is a characteristic diagram showing the relationship between air gap length and magnetic flux density, Figure 5 (b) is a diagram with percentages showing the relationship between air gap length and magnetic attraction force, and Figure 6
The figure is a cross-sectional view showing the operation of an embodiment of the present invention, and FIG. 7 is a cross-sectional view showing the operation when the iron core is made more movable in the present invention.
FIG. 8 is a sectional view of a magnetic attraction device using permanent magnets as another example of the present invention. 2... Main core part, 2a... Inner cylindrical core, 2b...
Outer cylindrical core, 2C... Core back, 3... Exciting coil, 5... Movable ring core, 5a,... Pin, 5b...
Movable cylindrical core, 8°8a...pressure spring, 11...permanent magnet.

Claims (1)

【特許請求の範囲】 １、磁性材からなる壁面に磁気吸引力を利用して吸着さ
せる鉄心、および励磁コイルもしくは永久磁石から成り
、前記励磁コイルもしくは永久磁石を装着した磁気回路
を構成する主鉄心の他に、該主鉄心に接触し、かつ、移
動可能な磁性材からなる可動鉄心を設けた磁気吸着装置
において、前記主鉄心の磁気吸着面に空隙が生じると前
記可動鉄心を押圧バネで移動して壁面に接し、前記主鉄
心中の磁束が可動鉄心を介して壁面に流れるようにした
ことを特徴とする磁気吸着装置。 ２、特許請求の範囲第１項記載のものにおいて、前記可
動鉄心に加圧バネ等により所要の押圧力を与えるように
したことを特徴とする磁気吸着装置。 ３、特許請求の範囲第１項記載のものにおいて、前記主
鉄心に可動鉄心の移動量を制限する係止部を設けたこと
を特徴とする磁気吸着装置。 ４、特許請求の範囲第１項記載のものにおいて、磁気吸
着面が円形もしくは環状に構成した主鉄心で、反吸着面
側の円板形状の鉄心背部の厚みを、内径側になる程厚み
が大きくなるように構成したことを特徴とする磁気吸着
装置。 ５、特許請求の範囲第１項記載のものにおいて、前記可
動鉄心を分割し、各々の可動鉄心を押圧バネで押圧して
単独で移動できるようにしたことを特徴とする磁気吸着
装置。[Scope of Claims] 1. A main core comprising an iron core that is attracted to a wall surface made of a magnetic material using magnetic attraction, and an excitation coil or a permanent magnet, and constituting a magnetic circuit to which the excitation coil or permanent magnet is attached. In addition, in a magnetic attraction device including a movable core made of a magnetic material that is in contact with the main core and is movable, when a gap is created in the magnetic attraction surface of the main core, the movable core is moved by a pressing spring. 1. A magnetic adsorption device, characterized in that the main iron core is in contact with a wall surface so that magnetic flux in the main core flows to the wall surface via the movable iron core. 2. A magnetic attraction device according to claim 1, characterized in that a required pressing force is applied to the movable core by a pressure spring or the like. 3. A magnetic attraction device according to claim 1, characterized in that the main iron core is provided with a locking portion that limits the amount of movement of the movable iron core. 4. In the product described in claim 1, the main core has a circular or annular magnetic attraction surface, and the thickness of the back of the disk-shaped core on the side opposite to the attraction surface is such that it becomes thicker toward the inner diameter. A magnetic adsorption device characterized in that it is configured to increase in size. 5. A magnetic adsorption device according to claim 1, characterized in that the movable core is divided and each movable core is pressed by a pressure spring so that it can move independently.