JPH0468763B2 - - Google Patents
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- Publication number
- JPH0468763B2 JPH0468763B2 JP10437287A JP10437287A JPH0468763B2 JP H0468763 B2 JPH0468763 B2 JP H0468763B2 JP 10437287 A JP10437287 A JP 10437287A JP 10437287 A JP10437287 A JP 10437287A JP H0468763 B2 JPH0468763 B2 JP H0468763B2
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- current
- excitation coil
- rectifiers
- excitation
- lifting electromagnet
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Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は電磁石によつて鋼材等の鉄製品を吸
着、運搬するための吊上用電磁石装置に関し、特
に鋼材等の鉄製品の消磁を行うことのできる吊上
用電磁石装置に関する。[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a lifting electromagnet device for attracting and transporting iron products such as steel materials using an electromagnet, and particularly for demagnetizing iron products such as steel materials. This invention relates to a lifting electromagnet device that can be used for lifting.
（従来の技術）
従来から鋼材等の鉄製品を吸着して運搬する吊
上用電磁石装置が知られている。この吊上用電磁
石装置を用いて鋼材を吸着して運搬した場合、鋼
材に残留磁気が生じるから、この残留磁気を取り
除く必要がある。つまり、消磁を行う必要があ
る。(Prior Art) Lifting electromagnetic devices that attract and transport iron products such as steel materials have been known. When a steel material is attracted and transported using this lifting electromagnet device, residual magnetism is generated in the steel material, so it is necessary to remove this residual magnetism. In other words, it is necessary to perform demagnetization.
このような鋼材の消磁を行う吊上用電磁石装置
として、同日に出願した「吊上用電磁石装置及び
その制御方法」の明細書に記載した吊上用電磁石
がある。この吊上用電磁石装置では電磁石に第１
の励磁コイル及び第２の励磁コイルが備えられて
おり、鋼材を吸着運搬する際には、第６図ａに示
すように第１の励磁コイルに電流を流して電磁石
に鋼材を吸着し、鋼材を所定の位置に運搬した
後、第１の励磁コイルに流す電流を減衰させる。
次に、第６図ａ及びｂに示すように所定のタイミ
ングでしかも電流波形の振幅が徐々に小さくなる
よう第１及び第２の励磁コイルに電流を流して、
第６図ｃに示すように磁束を発生させ、鋼材の残
留磁気を消磁する。 As a lifting electromagnet device that demagnetizes steel materials, there is a lifting electromagnet described in the specification of ``Lifting Electromagnet Device and Control Method Therefor'' filed on the same day. In this lifting electromagnet device, the electromagnet
An excitation coil and a second excitation coil are provided, and when the steel material is to be transported by attraction, a current is applied to the first excitation coil to attract the steel material to the electromagnet, as shown in Fig. 6a, and the steel material is attracted to the electromagnet. After transporting the coil to a predetermined position, the current flowing through the first excitation coil is attenuated.
Next, as shown in FIGS. 6a and 6b, current is applied to the first and second excitation coils at predetermined timing and in such a way that the amplitude of the current waveform gradually decreases.
As shown in FIG. 6c, a magnetic flux is generated to demagnetize the residual magnetism in the steel material.
（発明が解決しようとする問題点）
ところで、上述の吊上用電磁石装置の場合、第
１及び第２の励磁コイルを備えて、鋼材の消磁の
際、所定のタイミングで通電制御しているから、
同日出願した「吊上用電磁石装置及びその制御方
法」の明細書記載のとおり消磁時間を短くするこ
とができる。(Problems to be Solved by the Invention) By the way, in the case of the above-mentioned lifting electromagnet device, the first and second excitation coils are provided and energization is controlled at a predetermined timing when demagnetizing the steel material. ,
The demagnetization time can be shortened as described in the specification of ``Lifting electromagnet device and control method thereof'' filed on the same day.
消磁通電時間は短いから、消磁にのみ用いられ
る第２の励磁コイルは少ない巻回数として、大電
流を流せばよいが、電源装置の経済性及び給電系
統によつて制約を受け、第２の励磁コイルのボリ
ユームは第１の励磁コイルの20〜25％程度であ
る。 Since the demagnetization energization time is short, the second excitation coil used only for demagnetization can be turned with a small number of turns and a large current can be passed through it. The volume of the coil is about 20 to 25% of that of the first excitation coil.
このように、従来の吊上用電磁石装置の場合、
第１の励磁コイルの外に第２の励磁コイルを備え
ているから吊上電磁石自体の重量が増えるという
問題点がある。 In this way, in the case of the conventional lifting electromagnet device,
Since the second excitation coil is provided in addition to the first excitation coil, there is a problem in that the weight of the lifting electromagnet itself increases.
本発明の目的は荷役効率が良好で、軽量の吊上
用電磁石装置を提供することにある。 An object of the present invention is to provide a lifting electromagnet device that is lightweight and has good cargo handling efficiency.
（問題点を解決するための手段）
本発明によれば、交流電源に接続された第１及
び第２の整流器にそれぞれ接続された第１及び第
２の励磁コイルを備える電磁石と、第２の励磁コ
イルに流れる電流の方向を切り替えるスイツチ手
段と、第１及び第２の励磁コイルに流れる電流を
それぞれ検出する検出手段と、スイツチ手段を切
替え制御するとともに第１及び第２の整流器を制
御する制御手段とを有し、吸着の際には、制御手
段は第１及び第２の整流器とスイツチ手段を制御
して、第１及び第２の励磁コイルにより生じる磁
束が同方向となるように第１及び第２の励磁コイ
ルに電流を流し、消磁の際には、制御手段は吸着
の際とは逆向きに第２の励磁コイルに電流や流れ
るようにスイツチ手段を切替えて、検出手段によ
り検出される電流値に基づいて第１及び第２の整
流器を制御方して、所定のタイミングで第１及び
第２の励磁コイルに流れる電流を制御するように
したことを特徴とする吊上用電磁石装置が得られ
る。(Means for Solving the Problems) According to the present invention, an electromagnet including first and second excitation coils respectively connected to first and second rectifiers connected to an AC power source; A switch means for switching the direction of the current flowing through the excitation coil, a detection means for detecting the current flowing through the first and second excitation coils, and a control for switching and controlling the switch means and controlling the first and second rectifiers. and the control means controls the first and second rectifiers and the switch means so that the magnetic fluxes generated by the first and second excitation coils are in the same direction. and the second excitation coil, and during demagnetization, the control means switches the switch means so that the current flows through the second excitation coil in the opposite direction to that during attraction, and the current is detected by the detection means. A lifting electromagnet device characterized in that the first and second rectifiers are controlled based on the current value of the current, and the current flowing through the first and second excitation coils is controlled at a predetermined timing. is obtained.
（実施例） 以下本発明について実施例によつて説明する。(Example) The present invention will be explained below with reference to Examples.
まず、第３図を参照して、本発明に用いられる
吊上用電磁石は鉄芯（ヨーク）１３とこのヨーク
に巻回された第１の励磁コイル４ａ及び第２の励
磁コイル４ｂとを備えており、後述するようにし
て鋼材１４の吸着及び消磁が行われる。 First, referring to FIG. 3, the lifting electromagnet used in the present invention includes an iron core (yoke) 13 and a first excitation coil 4a and a second excitation coil 4b wound around the yoke. The steel material 14 is attracted and demagnetized as described below.
ここで、第１図も参照して、鋼材の運搬を行う
場合、まず、制御回路（指令回路）１０によつて
電磁接触器１１がオン（ON）され、接点１１ａ
が閉じれらる。次に、制御回路１０から位相制御
回路９ａ及び９ｂに対して吸着電流指令信号が送
出される。位相制御回路９ａ及び９ｂは吸着電流
指令信号に基づいてそれぞれサイリスタ整流器２
及び３にゲート信号を送出する。その結果、サイ
リスタ整流器２及び３がオンして、励磁コイル４
ａ及び４ｂにそれぞれ電流I1，I2が流れる（電流
I2は破線矢印で示す方向）。この際、電流I1及びI2
は徐々に増大して、一定となる（第２図ａ及びｂ
に示す〜区間及び〜区間）
電流I1及びI2によつて生じる磁束をそれぞれφ1
及びφ2とすれば、磁束φ1及びφ2は同方向に発生
するから、電磁石に発生する合成磁束はφ＝φ1
＋φ2となる（第２図ｃ）。そして、電磁石によつ
て鋼材が吸着されて、運搬される。 Here, referring also to FIG. 1, when transporting steel materials, first, the control circuit (command circuit) 10 turns on the electromagnetic contactor 11, and the contact 11a
will be closed. Next, an adsorption current command signal is sent from the control circuit 10 to the phase control circuits 9a and 9b. The phase control circuits 9a and 9b each control the thyristor rectifier 2 based on the adsorption current command signal.
and 3 to send out a gate signal. As a result, the thyristor rectifiers 2 and 3 are turned on, and the exciting coil 4
Currents I 1 and I 2 flow through a and 4b, respectively (current
I 2 is the direction indicated by the dashed arrow). At this time, the currents I 1 and I 2
gradually increases and becomes constant (Fig. 2 a and b)
) The magnetic fluxes generated by the currents I 1 and I 2 are respectively φ 1
and φ 2 , magnetic fluxes φ 1 and φ 2 are generated in the same direction, so the composite magnetic flux generated in the electromagnet is φ = φ 1
+φ 2 (Figure 2c). The steel material is then attracted and transported by the electromagnet.
次に鋼材の消磁を行う際には、前述の吸着電流
指令信号がリセツトされる。位相制御回路９ａ及
び９ｂは、吸着電流指令信号がリセツトされる
と、位相制御角を電源回生動作域として、それぞ
れサイリスタ整流器２及び３を制御する（ゲート
信号を与える）。この結果、サイリスタ整流器２
及び３は回生動作を行い、その結果、励磁コイル
４ａ及び４ｂに流れる電流が急激に減少する（第
２図ａ及びｂに示す〜区間、〜区間）。
励磁コイル４ａ及び４ｂに流れる電流がそれぞれ
保持電流以下となると、サイリスタ整流器２及び
３はオフする（第２図ａ及びｂに示す点及び
点）。 Next, when demagnetizing the steel material, the above-mentioned attraction current command signal is reset. When the adsorption current command signal is reset, the phase control circuits 9a and 9b control the thyristor rectifiers 2 and 3 (give gate signals), respectively, using the phase control angle as a power regeneration operation range. As a result, thyristor rectifier 2
and 3 perform a regenerative operation, and as a result, the current flowing through the excitation coils 4a and 4b sharply decreases (-sections and -sections shown in FIGS. 2a and 2b).
When the currents flowing through the excitation coils 4a and 4b respectively become lower than the holding current, the thyristor rectifiers 2 and 3 are turned off (points and points shown in FIG. 2 a and b).
制御回路１０によつて電磁接触器１１がオフさ
れて、接点１１ａが開かれる。一方、電磁接触器
１２がオンされて、接点１２ａが閉じられる。 The control circuit 10 turns off the electromagnetic contactor 11 and opens the contact 11a. On the other hand, the electromagnetic contactor 12 is turned on and the contact 12a is closed.
制御回路１０から位相制御回路９ｂ及び電流一
致検出回路８ｂへ第１の消磁電流指令信号が送出
される。位相制御回路９ｂは第１の消磁電流指令
信号に基づいて、サイリスタ整流器３にゲート信
号を送出する。その結果、サイリスタ整流器３が
オンされ、励磁コイル４ｂに電流I2が実線矢印で
示す方向に流れる。この際、励磁コイル４ｂに流
れる電流I2はサイリスタ整流器の出力電圧と吊上
電磁石の時定数とにより徐々に増大する（第２図
ｂに示す〜区間）
一方、励磁コイル４ｂに流れる電流I2は電流検
出器７ｂにより検知され、電流一致検出回路８ｂ
に入力される。電流一致検出回路８ｂは、第１の
消磁電流指令信号で設定された第１の消磁電流設
定値と電流検出値とを比較し、その結果、第１の
消磁電流設定値と電流検出値とが一致すると、電
流一致検出回路８ｂから制御回路１０に電流一致
信号が送出される（第２図ｂに示す点）
制御回路１０は、この電流一致信号を受ける
と、第１の消磁電流指令信号をリセツトするとと
もに位相制御回路９ａ及び電流一致検出回路８ａ
へ第２の消磁電流指令信号を送出する。 A first degaussing current command signal is sent from the control circuit 10 to the phase control circuit 9b and the current coincidence detection circuit 8b. The phase control circuit 9b sends a gate signal to the thyristor rectifier 3 based on the first degaussing current command signal. As a result, the thyristor rectifier 3 is turned on, and current I 2 flows through the exciting coil 4b in the direction indicated by the solid arrow. At this time, the current I 2 flowing through the exciting coil 4b gradually increases depending on the output voltage of the thyristor rectifier and the time constant of the lifting electromagnet (~section shown in FIG. 2b).On the other hand, the current I 2 flowing through the exciting coil 4b is detected by the current detector 7b, and the current coincidence detection circuit 8b
is input. The current coincidence detection circuit 8b compares the first degaussing current setting value set by the first degaussing current command signal and the current detection value, and as a result, the first degaussing current setting value and the current detection value are determined to be different. When they match, a current match signal is sent from the current match detection circuit 8b to the control circuit 10 (point shown in FIG. 2b). When the control circuit 10 receives this current match signal, it sends the first degaussing current command signal. At the same time as resetting, the phase control circuit 9a and the current coincidence detection circuit 8a
A second degaussing current command signal is sent to.
第１の消磁電流指令信号のリセツトにより、位
相制御回路９ｂは位相制御角を電源回生動作域と
して、サイリスタ整流器３を制御する（ゲート信
号を与える）。この結果、サイリスタ整流器３は
回生動作を行い、励磁コイル４ｂに流れる電流
は、急激に減少する。励磁コイル４ｂに流れる電
流が保持電流以下となると、サイリスタ整流器３
はオフする（第２図ｂに示す点）。 By resetting the first degaussing current command signal, the phase control circuit 9b controls the thyristor rectifier 3 (gives a gate signal) with the phase control angle set in the power regeneration operation range. As a result, the thyristor rectifier 3 performs a regenerative operation, and the current flowing through the exciting coil 4b rapidly decreases. When the current flowing through the excitation coil 4b becomes less than the holding current, the thyristor rectifier 3
is off (point shown in Figure 2b).
一方、位相制御回路９ａは第２の消磁電流指令
信号に基づいてサイリスタ整流器２にゲート信号
を送出する。その結果、サイリスタ整流器２がオ
ンされ、励磁コイル４ａに実線矢印で示す方向に
電流I1が流れる。この際、この電流I1は徐徐に増
大する（第２図ａに示す〜区間）。励磁コイ
ル４ａに流れる電流I1は電流検出器７ａにより検
知され、電流一致検出回路８ａに入力される。電
流一致検出回路８ａは、第２の消磁電流指令信号
で設定された第２の消磁電流設定値（第２の消磁
電流設定値＜第１の消磁電流設定値）と電流検出
値とを比較し、その結果、第２の消磁電流設定値
と電流検出値とが一致すると、電流一致検出回路
８ａから制御回路１０に電流一致信号が送出され
る（第２図ａに示す点）。 On the other hand, the phase control circuit 9a sends out a gate signal to the thyristor rectifier 2 based on the second degaussing current command signal. As a result, the thyristor rectifier 2 is turned on, and a current I1 flows through the exciting coil 4a in the direction shown by the solid arrow. At this time, this current I1 gradually increases (section ~ shown in FIG. 2a). The current I 1 flowing through the exciting coil 4a is detected by the current detector 7a and input to the current coincidence detection circuit 8a. The current coincidence detection circuit 8a compares the current detection value with a second degaussing current setting value set by the second degaussing current command signal (second degaussing current setting value<first degaussing current setting value). As a result, when the second demagnetizing current setting value and the detected current value match, a current matching signal is sent from the current matching detection circuit 8a to the control circuit 10 (point shown in FIG. 2a).
制御回路１０は、この電流一致信号を受ける
と、第２の消磁電流指令信号をリセツトするとと
もに位相制御回路９ｂ及び電流一致検出回路８ｂ
に第３の消磁電流指令信号を送出する。以後同様
にしてサイリスタ整流器２及び３が所定のタイミ
ングで制御される。 When the control circuit 10 receives this current coincidence signal, it resets the second degaussing current command signal and also controls the phase control circuit 9b and the current coincidence detection circuit 8b.
A third degaussing current command signal is sent out. Thereafter, thyristor rectifiers 2 and 3 are controlled at predetermined timing in the same manner.
ここで第４図に従来の吊上電磁石装置の励磁コ
イルの巻数と本発明による吊上電磁石装置の励磁
コイルの巻数とを比較して示す。 Here, FIG. 4 shows a comparison between the number of turns of the excitation coil of the conventional lifting electromagnet device and the number of turns of the excitation coil of the lifting electromagnet device according to the present invention.
第４図から明らかなように、本発明の吊上電磁
石装置では、第１の励磁コイル４ａの巻数＝第２
の励磁コイル４ｂの巻数＝Ｔ／２であるから、第１
の励磁コイル４ａの巻数＋第２の励磁コイル４ｂ
の巻数＝Ｔである。一方、従来の吊上電磁石装置
の場合、第１の励磁コイル４a′の巻数＝Ｔ、第２
の励磁コイル４b′の巻数＝ｔであるから、第１の
励磁コイル４a′の巻数＋第２の励磁コイル４b′の
巻数＝Ｔ＋ｔである。Ｔ＜Ｔ＋ｔであるから、本
発明の吊上電磁石装置は従来の吊上電磁石装置に
比べて軽量となる。なお、消磁の際、各励磁コイ
ルにそれぞれ電流を流さねばならないが、消磁に
要する時間が短かいため消費電力の増加は少なく
て済む。 As is clear from FIG. 4, in the suspension electromagnet device of the present invention, the number of turns of the first exciting coil 4a = the second
Since the number of turns of the excitation coil 4b = T/2, the number of turns of the first excitation coil 4a + the second excitation coil 4b
The number of turns of is T. On the other hand, in the case of a conventional lifting electromagnet device, the number of turns of the first exciting coil 4a'=T, the second
Since the number of turns of the excitation coil 4b' is t, the number of turns of the first excitation coil 4a'+the number of turns of the second excitation coil 4b'=T+t. Since T<T+t, the lifting electromagnet device of the present invention is lighter than the conventional lifting electromagnet device. Note that during demagnetization, a current must be passed through each excitation coil, but since the time required for demagnetization is short, the increase in power consumption is small.
ところで、第５図に示すように、サブ励磁コイ
ル４a1及び励磁コイル４a2を直列又は並列（図の
例では直列）に接続して第１の励磁コイル４ａと
し、また、サブ励磁コイル４b1及びサブ励磁コイ
ル４b2を直列又は並列（図の例では直列）に接続
して第２の励磁コイル４ｂとして、これら第１及
び第２の励磁コイル４ａ及び４ｂをそれぞれサイ
リスタ整流器２及び３に接続して、前述のように
サイリスタ整流器２及び３を制御してもよい。 By the way, as shown in FIG. 5, the sub excitation coil 4a 1 and the excitation coil 4a 2 are connected in series or in parallel (in series in the example shown) to form the first excitation coil 4a, and the sub excitation coil 4b 1 and sub excitation coil 4b 2 are connected in series or parallel (in series in the example shown) to form a second excitation coil 4b, and these first and second excitation coils 4a and 4b are connected to thyristor rectifiers 2 and 3, respectively. Then, the thyristor rectifiers 2 and 3 may be controlled as described above.
つまり、第１及び第２の励磁コイル４ａ及び４
ｂをそれぞれ直列又は並列に接続された複数のサ
ブ励磁コイルに分けて、第１及び第２の励磁コイ
ル４ａ及び４ｂをそれぞれサイリスタ整流器２及
び３に接続してもよい。 That is, the first and second exciting coils 4a and 4
b may be divided into a plurality of sub-excitation coils connected in series or in parallel, and the first and second excitation coils 4a and 4b may be connected to the thyristor rectifiers 2 and 3, respectively.
（発明の効果）
以上説明したように、本発明によれば、消磁時
間が短く、即ち、吸着、運搬、消磁と１サイクル
の時間が短い効率のよい吊上用電磁石装置が得ら
れ、しかも軽量の電磁石装置が得られるという効
果がある。(Effects of the Invention) As explained above, according to the present invention, it is possible to obtain an efficient lifting electromagnet device in which the demagnetization time is short, that is, the time for one cycle of attraction, transportation, and demagnetization is short, and in addition, it is lightweight. This has the effect of providing an electromagnetic device.
第１図は本発明による吊上用電磁石装置の一実
施例を示す図、第２図ａ，ｂ、及びｃはそれぞれ
本発明による吊上用電磁石装置において第１の励
磁コイルに流れる電流、第２の励磁コイルに流れ
る電流、及び吊上電磁石の合成磁束を示す図、第
３図は吊上用電磁石の一例を示す図、第４図は本
発明による吊上用電磁石装置の励磁コイルの巻数
と従来の吊上用電磁石装置の励磁コイルの巻数と
を説明するための図、第５図は吊上用電磁の他の
例を示す図、第６図ａ，ｂ、及びｃはそれぞれ従
来の吊上用電磁石装置において第１の励磁コイル
に流れる電流、第２の励磁コイルに流れる電流及
び吊上用電磁石の合成磁束を示す図である。
１……交流電源、２，３……サイリスタ整流
器、４ａ……第１の励磁コイル、４ｂ……第２の
励磁コイル、７ａ，７ｂ……電流検出器、８ａ，
８ｂ……電流一致検出器、９ａ，９ｂ……位相制
御回路、１０……制御回路（指令回路）、１１，
１２……電磁接触器。
FIG. 1 is a diagram showing an embodiment of the lifting electromagnet device according to the present invention, and FIGS. 2 a, b, and c respectively show the current flowing in the first exciting coil and the FIG. 3 is a diagram showing an example of a lifting electromagnet, and FIG. 4 is a diagram showing the number of turns of the excitation coil of the lifting electromagnet device according to the present invention. and the number of turns of the excitation coil of a conventional lifting electromagnet device, FIG. 5 is a diagram showing another example of a lifting electromagnet device, and FIGS. It is a figure which shows the electric current which flows into a 1st excitation coil, the electric current which flows into a 2nd excitation coil, and the synthetic magnetic flux of a lifting electromagnet in a lifting electromagnet device. 1... AC power supply, 2, 3... Thyristor rectifier, 4a... First excitation coil, 4b... Second excitation coil, 7a, 7b... Current detector, 8a,
8b...Current coincidence detector, 9a, 9b...Phase control circuit, 10...Control circuit (command circuit), 11,
12...Magnetic contactor.
Claims (1)
にそれぞれ接続された第１及び第２の励磁コイル
を備える電磁石と、前記第２の励磁コイルに流れ
る電流の方向を切り替えるスイツチ手段と、前記
第１及び第２の励磁コイルに流れる電流をそれぞ
れ検出する検出手段と、前記スイツチ手段を切替
え制御するとともに前記第１及び第２の整流器を
制御する制御手段とを有し、吸着の際には、前記
制御手段は前記第１及び第２の整流器と前記スイ
ツチ手段を制御して、前記第１及び第２の励磁コ
イルにより生じる磁束が同方向となるように前記
第１及び第２の励磁コイルに電流を流し、消磁の
際には、前記制御手段は前記吸着の際とは逆向き
に前記第２の励磁コイルに電流が流れるように前
記スイツチ手段を切替えて、前記検出手段により
検出される電流値に基づいて前記第１及び第２の
整流器を制御して、所定のタイミングで前記第１
及び第２の励磁コイルに流れる電流を制御するよ
うにしたことを特徴とする吊上用電磁石装置。1 an electromagnet comprising first and second excitation coils respectively connected to first and second rectifiers connected to an AC power source; a switch means for switching the direction of the current flowing through the second excitation coil; It has detection means for detecting the currents flowing through the first and second exciting coils, and control means for switching and controlling the switching means and controlling the first and second rectifiers, , the control means controls the first and second rectifiers and the switch means to control the first and second excitation coils so that the magnetic fluxes generated by the first and second excitation coils are in the same direction. During demagnetization, the control means switches the switch means so that the current flows through the second excitation coil in the opposite direction to that during the attraction, and the current is detected by the detection means. The first and second rectifiers are controlled based on the current value, and the first and second rectifiers are controlled at a predetermined timing.
and a lifting electromagnet device, characterized in that the current flowing through the second excitation coil is controlled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10437287A JPS63272019A (en) | 1987-04-30 | 1987-04-30 | Lifting electromagnet device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10437287A JPS63272019A (en) | 1987-04-30 | 1987-04-30 | Lifting electromagnet device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63272019A JPS63272019A (en) | 1988-11-09 |
| JPH0468763B2 true JPH0468763B2 (en) | 1992-11-04 |
Family
ID=14378963
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10437287A Granted JPS63272019A (en) | 1987-04-30 | 1987-04-30 | Lifting electromagnet device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63272019A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006335535A (en) * | 2005-06-03 | 2006-12-14 | Shin Caterpillar Mitsubishi Ltd | Lifting magnet device |
-
1987
- 1987-04-30 JP JP10437287A patent/JPS63272019A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63272019A (en) | 1988-11-09 |
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