JPH06271272A - Floating and landing detection device for object lifted with electromagnetic lift - Google Patents

Abstract

PURPOSE:To make a device compact, and embody the low cost by supporting a plurality of electromagnets on a horizontally laid substrate suspended with a wire, via a movable suspension member, and providing a detector having a detection body to come in contact with the upper surface of a lifted object at the time of landing on a floor. CONSTITUTION:Two electromagnets 11 and 11 are respectively supported on a horizontally laid substrate 12 suspended with a lifting wire 14, via movable suspension members (chains or the like) 13 and 13, and a detection body 15 coming in contact with the upper surface of a lifted object (a) adsorbed to and lifted with the electromagnets 11 and 11 at the time of landing, is supported via a chain 18. In this case, the detection body 15 is held at height, as so not to come in contact with the upper surface of the object (a) in afloat state. Also, a detector 16 laid on the substrate 12 is actuated via a movable connection member 17, depending on the contact state of the detection body 15 with the upper surface of the object (a), and then power supply to the electromagnets 11 and 11, or the adsorption or release of the object (a) is controlled on the basis of an output signal from the detector 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnet lift crane for detecting the lifting and leaving of a suspended object by an electromagnet and the suspension and landing of a suspended object.

[0002]

2. Description of the Related Art In an apparatus such as an electromagnet lift crane that attracts, lifts, and moves a suspended object with an electromagnet, if the suspended object falls due to current interruption after the suspension, a serious accident may occur.

One of the countermeasures is Japanese Patent Publication Sho 54-11177.
It is disclosed in the publication. As shown in FIG. 2, the apparatus includes an electromagnet 1 for adsorbing a suspended object a, and a load detector 2.
And a suspending tool 3 for suspending the electromagnet 1 by being hooked on the vertical movement hook 2a of the detector 2, and a suspending tool 4 for suspending the electromagnet 1 by hooking the upper portion of the load detector 2 on the hook 4a. Reference numeral 5 is a cable that sends a signal from the load detector 2.

In this apparatus, the vertical movement hook 2a of the load detector 2 is moved up and down by the load of the suspended object a, and this movement actuates a limit switch (not shown) to adsorb the suspended object. During that period, the excitation to the electromagnet 1 cannot be released, and the release can be made after the suspended object has landed and the limit switch has been activated.

[0005]

When the above device is applied to a lift for lifting a heavy object such as a rolling slab by a joint operation of a plurality of electromagnets, the total load (suspended object + substrate) Since the detector receives the load, the detector itself and the movable hook must be rigid, and the load is restored (board + electromagnet) even when the suspended object is not being lifted. There is a problem that the member must be strong and expensive.

The present invention aims to provide an apparatus which solves the above problems.

[0007]

In order to achieve the above object, the apparatus of the present invention includes a substrate on which a plurality of electromagnets are suspended and a suspended object when the suspended object adsorbed by the electromagnet is in a state of leaving the floor. Between the electromagnets so as to come into contact with the upper surface of the object to be lifted when in a landing state, a detector provided on the substrate, detectors provided on the substrate, and the detectors and detectors. And a connecting member that transmits the movement of the detection body to the detector.

[0008]

Since the device of the present invention has the above-mentioned detector, detector and connecting member, the load of the detector acts on the detector when the suspended object is in the floor, but the load of the detector is in the floor. Since the detector does not act on the detector, signals can be output from the detector when the load is applied to the detector and when the load is not applied.The signal prevents the current supply to the electromagnet from being released when the object is suspended. It is possible and can prevent the accident of hanging. The current supply to the electromagnet is cut off in the landing state.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the device of the present invention will be described with reference to FIG.

In FIG. 1, (A) is a front view showing a state in which a suspended object is lifted by an electromagnet lift, and (B) is a front view showing its landing state.

In the figure, 11 and 11 are electromagnets, 12 is a horizontal substrate, 13 and 13 are suspension members (chains in this example) for suspending the electromagnets 11 and 11 from the substrate 12, 14 and 14.
Is a lifting wire attached to the upper surface of the substrate 12, a is a suspended object (slab of 12 m × 1.6 m × 0.24 m in this example), 15 is a detector suspended from the substrate 12, 1
6 is a detector (micro switch in this example) attached to the substrate 12, 16a is an operating lever of the detector, 17 is a connecting member for connecting the operating lever 16a and the detecting body 15, and 18 is for hanging the detecting body on the substrate. This is Chen. 19
Indicates the floor surface.

In this embodiment, the electromagnet is 1400 mmΦ ×
With a size of 300 mm, the distance between both electromagnets 11, 11 is 33.
The distance T was 1 mm and the distance T between the slab and the substrate was 1190 mm when the slab was lifted from the floor.

As the detection body 15, 150 mmΦ, 65 mm
Using a cylindrical body having a weight of about 4 kg, the length of the detection body suspension chain is set so that the distance t between the detection body 15 and the slab a is 5 mm when the bed is out of bed, and the detection body 16 and the detection body 16 are detected. 1215mm with 5mmΦ as connecting member with body 15
When a long wire is used, the operating lever 16a of the detector 16 is tilted downward as shown in FIG. 1 (A) when the bed is out of bed, and the gap T1 between the substrate 12 and the slab a in the landing state (see FIG.
When (B)) reached 1175 mm, the detector 15 was installed so that the operating lever 16a of the detector was horizontal as shown in the figure.

In the apparatus of this embodiment, the operating lever 16a of the detector is inclined downward when the bed is out of bed, and a signal is emitted.
Receiving this signal, erroneous release of current supply to the electromagnet is prevented by known means. When the operator has landed and is in the state shown in FIG. 1 (B), the operating lever 16a becomes horizontal and again issues a signal, and upon receipt of this signal, the current supply to the electromagnet is stopped by a known means.

[0015]

As described above, since the device of the present invention is a device in which the load of the electromagnet and the suspended object does not act at all, it has an effect that it is extremely simple and compact and can be installed at a low cost.

[Brief description of drawings]

FIG. 1 is a front view (A) in a suspended state by an electromagnet lift equipped with the device of the present invention and a front view (B) in a landing state.

FIG. 2 is a conventional front view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... Electromagnet 12 ... Horizontal board 13 ... Suspension member 15 ... Detector 16 ... Detector 17 ... Connection member 19 ... Floor surface a ... Slab (suspended object)

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[Procedure amendment]

[Submission date] May 13, 1994

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuhisa Kitahara 1212 Hitomi, Kimitsu, Chiba Prefecture Mishima Kosan Co., Ltd.Kimitsu Division, Steel Business Division (72) Inventor Koichi Suetsugu 1212 Hitomi, Kimitsu, Chiba Stocks Mishima Company Steel Business Headquarters Kimitsu Business Division (72) Inventor Shozo Yaya 1212 Hitomi, Kimitsu City, Chiba Prefecture Mishima Kosan Co., Ltd. Kimitsu Division, Steel Business Division

Claims (1)

[Claims] 1. A floor lift of a suspended object by an electromagnet lift comprising a horizontal substrate suspended by a lifting wire and a suspending member suspending a plurality of electromagnets vertically movable at appropriate intervals from the substrate. In the landing detection device, it is between the substrate and the object to be hung when it is out of the floor, and when it is on the floor, it is vertically movably detected so as to come into contact with the upper surface of the object to be suspended A body, a detector provided on the substrate, and a connecting member for connecting the detector and the detector and transmitting the movement of the detector to the detector. Floor detector.