JPH0442806B2 - - Google Patents
Info
- Publication number
- JPH0442806B2 JPH0442806B2 JP5157285A JP5157285A JPH0442806B2 JP H0442806 B2 JPH0442806 B2 JP H0442806B2 JP 5157285 A JP5157285 A JP 5157285A JP 5157285 A JP5157285 A JP 5157285A JP H0442806 B2 JPH0442806 B2 JP H0442806B2
- Authority
- JP
- Japan
- Prior art keywords
- electromagnets
- electromagnet
- current
- reference value
- value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000001514 detection method Methods 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 description 17
- 239000010959 steel Substances 0.000 description 17
- 239000000463 material Substances 0.000 description 13
- 238000000034 method Methods 0.000 description 3
- 230000032258 transport Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 210000002784 stomach Anatomy 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
- H01F7/1877—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings controlling a plurality of loads
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manipulator (AREA)
- Load-Engaging Elements For Cranes (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は電磁石を用いて、鋼材等の荷物を吸
着、運搬するための装置（以下リフテイングマグ
ネツト装置と呼ぶ）に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a device (hereinafter referred to as a lifting magnet device) for attracting and transporting cargo such as steel materials using an electromagnet.
（従来の技術）
リフテイングマグネツト装置には複数個の電磁
石が設けられており、この電磁石に通電して鋼材
等を吊して、荷役を行つている。(Prior Art) A lifting magnet device is provided with a plurality of electromagnets, and the electromagnets are energized to lift steel materials and the like for cargo handling.
一般に、リフテイングマグネツト装置では鋼材
の大きさ、形状及び重量等によつて複数個の電磁
石を選択的に励磁して鋼材を吊り上げ、運搬して
いる。各電磁石への給電方式は複数個の電源装置
により給電方式では高価となるため、一般には単
一の電源装置による給電方式が採用されている。 Generally, in a lifting magnet device, a plurality of electromagnets are selectively energized depending on the size, shape, weight, etc. of the steel material to lift and transport the steel material. Since the method of feeding power to each electromagnet using a plurality of power supply devices is expensive, a power feeding method using a single power supply device is generally adopted.
（発明が解決しようとする問題点）
前述のように、リフテイングマグネツト装置は
複数個の電磁石を選択的に励磁しているから、電
磁石によつて使用頻度が異なる。即ち各電磁石へ
通電する時間の割合が異なつているため、電磁石
の発熱量が相異する。その結果、電磁石のコイル
抵抗値が電磁石によつて異なつてしまう。即ちコ
イル抵抗値が不揃となる。(Problems to be Solved by the Invention) As described above, since the lifting magnet device selectively excites a plurality of electromagnets, the frequency of use differs depending on the electromagnet. That is, since the proportion of time for which each electromagnet is energized is different, the amount of heat generated by the electromagnets is different. As a result, the coil resistance value of the electromagnet varies depending on the electromagnet. That is, the coil resistance values become uneven.
リフテイングマグネツト装置は単一電源装置に
よつて給電されているから、各電磁石に印加され
る電圧は同じである。従つて、コイル抵抗値が異
なれば、各電磁石に流れる電流値が異なり、電流
の不揃いが発生する。その結果、各電磁石の吸引
力に不揃が生じる。即ち、電磁石によつて吊上能
力が異なることになる。 Since the lifting magnet system is powered by a single power supply, the voltage applied to each electromagnet is the same. Therefore, if the coil resistance values are different, the current values flowing through each electromagnet will be different, causing current irregularities. As a result, the attraction force of each electromagnet becomes uneven. That is, the lifting capacity differs depending on the electromagnet.
例えば、鋼板運搬用のリフテイングマグネツト
装置においては、電磁石によつて、吊り上げ枚数
に差が生じるため、オペレータ等の作業者は吊り
上げ枚数を同じにするため、微妙な磁力調節操
作、あるいは鋼板間にリン木を挿入するなどの作
業をしなければならず、いずれにしても作業性が
著しく低下するという問題点がある。 For example, in a lifting magnet device for transporting steel plates, the number of sheets lifted differs depending on the electromagnet, so operators and other workers have to perform delicate magnetic force adjustment operations or adjust the distance between steel plates in order to keep the same number of sheets lifted. The problem is that work such as inserting a lint tree is required, and in either case, the workability is significantly reduced.
本発明の目的は電磁石の作用頻度の相異により
起こる吊上能力の違いを実質的に均一化すること
のできるリフテイングマグネツト装置を提供する
ことにある。 SUMMARY OF THE INVENTION An object of the present invention is to provide a lifting magnet device that can substantially equalize differences in lifting capacity caused by differences in the operating frequency of the electromagnets.
（問題点を解決するための手段）
本発明によれば、複数個の電磁石のそれぞれに
流れる電流を検出するための検出手段と、この検
出された電流のうち最小の電流を判別するための
判別手段と、複数個の電磁石のそれぞれに流れる
電流と上記の最小の電流とのずれを算出するため
の算出手段と、予め設定される基準値と上記のず
れのそれぞれとを比較するための比較手段とを有
し、選択された電磁石によつて荷物が所定の位置
まで吊り上げられると、すべての電磁石へ通電さ
れ、上記のずれが上記の基準値内であると、比較
手段からの信号に基づいてこの基準値内にあるず
れに該当する電磁石のうち選択されなかつた電磁
石への通電をオフとするようにしたことを特徴と
するリフテイングマグネツト装置が得られる。(Means for Solving the Problems) According to the present invention, there is provided a detection means for detecting the current flowing through each of a plurality of electromagnets, and a determination method for determining the minimum current among the detected currents. a calculation means for calculating the deviation between the current flowing through each of the plurality of electromagnets and the above-mentioned minimum current, and a comparison means for comparing each of the above-mentioned deviations with a preset reference value. and when the load is lifted to a predetermined position by the selected electromagnet, all the electromagnets are energized, and if the above deviation is within the above reference value, based on the signal from the comparison means. There is obtained a lifting magnet device characterized in that energization of electromagnets that are not selected among the electromagnets that fall within this reference value is turned off.
（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.
図面を参照して、運搬すべき鋼材（図示せず）
上に電磁石を配置する。そしてこの鋼材を吊り上
げるのに必要な電磁石を選択し（例えば電磁石４
ａ）、選択用操作スイツチ１１ａを閉じる。選択
用スイツチ１１ａが閉じられると電磁接触器１２
ａが励磁され、その接点１２a′が閉じられる。次
に制御回路からの指令によつて主回路開閉電磁接
触器２が閉じられて、交流電源（図示せず）に接
続された整流回路１から直流電流が電磁石４ａに
供給される。その結果、電磁石４ａに鋼材が吸着
される。鋼材が電磁石４ａに吸着されると、クレ
ーン（図示せず）を巻き上げ、鋼材を吊り上げ
る。鋼材が所定の高さに吊り上げられると、制御
回路は接点１０ａ，１０ｂ及び１０ｃを閉制する
ように制御する。 Referring to the drawing, the steel material to be transported (not shown)
Place an electromagnet on top. Then, select the electromagnet necessary to lift this steel material (for example, electromagnet 4
a) Close the selection operation switch 11a. When the selection switch 11a is closed, the electromagnetic contactor 12
a is energized and its contact 12a' is closed. Next, the main circuit switching electromagnetic contactor 2 is closed in response to a command from the control circuit, and a DC current is supplied to the electromagnet 4a from the rectifier circuit 1 connected to an AC power source (not shown). As a result, the steel material is attracted to the electromagnet 4a. When the steel material is attracted to the electromagnet 4a, a crane (not shown) is hoisted up and the steel material is hoisted up. When the steel material is lifted to a predetermined height, the control circuit controls the contacts 10a, 10b and 10c to close.
その結果、電磁接触器１２ｂ及び１２ｃが励磁
されて、接点１２b′及び１２c′が閉じられ、電磁
石４ｂ及び４ｃにも直流電流が流される。各電磁
石４ａ〜４ｃに流れる電流はそれぞれ電流検出器
３ａ〜３ｃによつて検出され、最小入力判別回路
５に入力される。最小入力判別回路５は入力され
た電流値Ia〜Icのうちの最も小さい電流値（以下
最小値と呼ぶ）を判別して、この最小値（Inio）
を出力する。 As a result, the electromagnetic contactors 12b and 12c are excited, the contacts 12b' and 12c' are closed, and a direct current is also caused to flow through the electromagnets 4b and 4c. The currents flowing through the electromagnets 4a to 4c are detected by current detectors 3a to 3c, respectively, and input to the minimum input discrimination circuit 5. The minimum input determination circuit 5 determines the smallest current value (hereinafter referred to as the minimum value) among the input current values I a to I c and determines this minimum value (I nio ).
Output.
図示のように電流値Iaと最小値Inioは差算出回
路６の減算回路６ａに入力され、電流値Ibと最小
値Inioが減算回路６ｂに入力され、また電流値Ic
と最小値Inioが減算回路６ｃに入力されている。
減算回路６ａは最小値Inioと電流値Iaとの差を求
め、この差の絶対値を電流値の差ΔIaとして出力
する。同様にして、減算回路６ｂは電流値の差
ΔIbを出力し、減算回路６ｃは電流値の差ΔIcを出
力する。比較器７中の比較回路７ａ，７ｂ及び７
ｃには、許容される電磁石電流の不揃い範囲、即
ち上述の電流値の差（ΔIa、ΔIb、ΔIc）の上限値
（基準値）が基限設定器８によつて設定される。
比較回路７ａ，７ｂ及び７ｃはそれぞれ電流値の
差ΔIa、ΔIb及びΔIcと基準値を比較し、その結果
電流値の差が基準値を超えていると、制御信号を
送出する。例えば、ΔIbが基準値を超えている場
合は、比較回路７ｂは制御信号を送出する。 As shown in the figure, the current value I a and the minimum value I nio are input to the subtraction circuit 6a of the difference calculation circuit 6, the current value I b and the minimum value I nio are input to the subtraction circuit 6b, and the current value I c
and the minimum value I nio are input to the subtraction circuit 6c.
The subtraction circuit 6a calculates the difference between the minimum value I nio and the current value I a and outputs the absolute value of this difference as the current value difference ΔI a . Similarly, the subtraction circuit 6b outputs the difference in current values ΔI b , and the subtraction circuit 6c outputs the difference in current values ΔI c . Comparison circuits 7a, 7b and 7 in comparator 7
The limit setter 8 sets the allowable range of electromagnet current irregularities, that is, the upper limit value (reference value) of the above-mentioned difference in current values (ΔI a , ΔI b , ΔI c ) to c.
Comparing circuits 7a, 7b, and 7c respectively compare the current value differences ΔI a , ΔI b , and ΔI c with a reference value, and if the results show that the current value differences exceed the reference value, they send out a control signal. For example, if ΔI b exceeds the reference value, the comparison circuit 7b sends out a control signal.
比較回路７ｂからの制御信号によつて、指令回
路９のスイツチングトランジスタ９２ａはオンと
なり、その結果、リレー９２ｂが導通状態となつ
て、リレー接点９２ｃが閉じる。一方、比較回路
７ａ及び７ｃからは制御信号が送出されないか
ら、スイツチングトランジスタ９１ａ及び９３ａ
はオフの状態であり、リレー９１ｂ及び９３ｂは
非導通であるから、リレー９１ｃ及び９３ｃは開
状態である。 A control signal from comparison circuit 7b turns on switching transistor 92a of command circuit 9, and as a result, relay 92b becomes conductive and relay contact 92c closes. On the other hand, since no control signals are sent from comparison circuits 7a and 7c, switching transistors 91a and 93a
is in an off state and relays 91b and 93b are non-conductive, so relays 91c and 93c are in an open state.
リレー接点９２ｃが閉じられた時点で、制御回
路からの指令によつて接点１０ａ，１０ｂ及び１
０ｃは開路される。その結果、設定値を超えた電
流（この場合Ib）が流れている電磁石４ｂには、
電磁接触器１２ｂが励磁されたままであるから、
電流が流れ続ける。一方、電磁接触器１２ｃの励
磁は停止されるから、接点１２c′は開路されて、
電磁石１２ｃへ流れている電流は遮断される。 When relay contact 92c is closed, contacts 10a, 10b and 1 are closed by a command from the control circuit.
0c is opened. As a result, the electromagnet 4b through which the current exceeding the set value (I b in this case) is flowing,
Since the electromagnetic contactor 12b remains excited,
Current continues to flow. On the other hand, since the excitation of the electromagnetic contactor 12c is stopped, the contact 12c' is opened,
The current flowing to the electromagnet 12c is cut off.
上述の状態で、リフテイングマグネツト装置は
鋼材を目的地点まで運搬し、鋼材を着地させる
と、制御回路からの指令によつて主回路電磁接触
器の接点２が開路されて、１回の作業サイクルが
完了する。上述の電磁石４ａ〜４ｃの電流制御は
１作業サイクルごとに行なわれ、１サイクル完了
後、制御回路からの指令によつてリセツトされ
る。 Under the above conditions, the lifting magnet device transports the steel material to the destination point, and when the steel material lands on the ground, contact 2 of the main circuit magnetic contactor is opened by a command from the control circuit, and one operation is completed. The cycle is complete. The above-mentioned current control of the electromagnets 4a to 4c is performed for each working cycle, and after one cycle is completed, it is reset by a command from the control circuit.
このように各電磁石に流れる電流のうちの最小
値と各電磁石に流れる電流値との差が基準値を超
える電磁石については、鋼材を吊り上げる必要が
ない場合においても、一作業サイクル中は通電
し、この電磁石の使用頻度を実質的に高めて、即
ち電磁石のコイル抵抗を上昇させることによつ
て、この電磁石に流れる電流を減少させることに
より、各電磁石に流れる電流を許容値内に収める
ことが可能となる。なお、上述の実施例では差算
出回路を用いているが、最小値との比率を求めて
もよい。 In this way, for electromagnets for which the difference between the minimum value of the current flowing through each electromagnet and the current value flowing through each electromagnet exceeds the standard value, the electromagnet will be energized during one work cycle even if there is no need to lift steel materials. By substantially increasing the frequency of use of this electromagnet, i.e. by increasing the coil resistance of the electromagnet, and thereby reducing the current flowing through this electromagnet, it is possible to keep the current flowing through each electromagnet within the permissible value. becomes. Note that although the above-described embodiment uses a difference calculation circuit, the ratio to the minimum value may also be calculated.
（発明の効果）
以上説明したように、本発明によるリフテイン
グマグネツト装置によれば、各電磁石に流れる電
流の不揃いが、実作業上許容される範囲内に調整
されるため、各電磁石の吊上能力に相異がなくな
る。(Effects of the Invention) As explained above, according to the lifting magnet device of the present invention, the unevenness of the current flowing through each electromagnet is adjusted to within an allowable range for actual work, so that the lifting of each electromagnet is improved. There will be no difference in superior abilities.
従つて、鋼板を運搬する場合、各電磁石の使用
頻度の相違に起因する電磁石の鋼板吊上枚数の相
違がなくなるため、オペレータ等の作業者の労力
が大幅に軽減でき、作業性が著しく向上するとい
う利点がある。なお、本発明によるリフテイング
マグネツト装置は複数の電源を用いて、即ち一台
の電源装置で一個の電磁石に給電するようにした
リフテイングマグネツト装置に比べて格段に安価
であることは言うまでもない。 Therefore, when transporting steel plates, there is no difference in the number of steel plates lifted by the electromagnets due to differences in the frequency of use of each electromagnet, so the labor of operators and other workers can be significantly reduced, and work efficiency is significantly improved. There is an advantage. It goes without saying that the lifting magnet device according to the present invention is much cheaper than a lifting magnet device that uses a plurality of power supplies, that is, one power supply device that supplies power to one electromagnet. stomach.
図面は本発明によるリフテイングマグネツト装
置の一実施例を示す結線図である。
１……整流回路、２……主回路用電磁接触器の
接点、３……電流検出器、４……電磁石、５……
最小入力判別回路、６……差算出回路、７……比
較器、８……基準値設定器、９……指令回路。
The drawing is a wiring diagram showing an embodiment of the lifting magnet device according to the present invention. 1... Rectifier circuit, 2... Main circuit electromagnetic contactor contact, 3... Current detector, 4... Electromagnet, 5...
Minimum input discrimination circuit, 6... Difference calculation circuit, 7... Comparator, 8... Reference value setter, 9... Command circuit.
Claims (1)
するための１つの電源装置とを有し、該電磁石を
選択的に用いて、荷物を吊り上げ運搬するリフテ
イングマグネツト装置において、前記複数個の電
磁石のそれぞれに流れる電流を検出するための検
出手段と、該検出された電流のうちの最小の電流
を判別する判別手段と、前記複数個の電磁石のそ
れぞれに流れる電流と前記最小の電流とのずれを
算出するための算出手段と、予め設定される基準
値とを前記ずれのそれぞれと比較するための比較
手段とを有し、選択された電磁石によつて前記荷
物が所定の位置まで吊り上げられると、前記電磁
石のすべてに通電され、前記ずれが前記基準値以
内であると、前記比較手段からの信号に基づいて
前記基準値内にある前記ずれに該当する前記電磁
石のうち選択されなかつた電磁石への通電をオフ
とするようにしたことを特徴とするリフテイング
マグネツト装置。1. A lifting magnet device that has a plurality of electromagnets and one power supply device for energizing the plurality of electromagnets, and selectively uses the electromagnets to lift and transport cargo, wherein the plurality of electromagnets are a detection means for detecting a current flowing through each of the plurality of electromagnets, a discrimination means for discriminating a minimum current among the detected currents, and a current flowing through each of the plurality of electromagnets and the minimum current. and a comparison means for comparing each of the deviations with a preset reference value, and the load is lifted to a predetermined position by a selected electromagnet. When the deviation is within the reference value, all of the electromagnets are energized, and when the deviation is within the reference value, the electromagnets that are not selected are selected based on the signal from the comparison means and correspond to the deviation within the reference value. A lifting magnet device characterized in that electricity to the electromagnet is turned off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5157285A JPS61212006A (en) | 1985-03-16 | 1985-03-16 | Lifting magnet device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5157285A JPS61212006A (en) | 1985-03-16 | 1985-03-16 | Lifting magnet device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61212006A JPS61212006A (en) | 1986-09-20 |
| JPH0442806B2 true JPH0442806B2 (en) | 1992-07-14 |
Family
ID=12890671
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5157285A Granted JPS61212006A (en) | 1985-03-16 | 1985-03-16 | Lifting magnet device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61212006A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5666286A (en) * | 1995-10-10 | 1997-09-09 | Nordson Corporation | Device and method for identifying a number of inductive loads in parallel |
-
1985
- 1985-03-16 JP JP5157285A patent/JPS61212006A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61212006A (en) | 1986-09-20 |
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