JP2000241393A - Magnetic flaw detection apparatus for elevator rope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a magnetic flaw detection apparatus for elevator ropes which can male a detecting part compact and simple in structure. SOLUTION: A detecting part 1 has magnetic bodies 1a and 1b spaced from each other to hold a rope 2 therebetween, a magnet 1c interposed between the magnetic bodies 1a and 1b and magnetic flux detecting elements 1d and 1e set to faces of the magnetic bodies 1a and 1b opposite to the rope 2 for detecting a main magnetic flux of a magnetic circuit. The magnetic circuit is formed in the order from an N pole of the magnet 1c, one magnetic body 1a, one magnetic flux detecting element 1d, the rope 2, the other magnetic flux-detecting element 1e, the other magnetic body 1b and an S pole of the magnet 1c. A strand break of the rope 2 is decided on the basis of the main magnetic flux detected by the magnetic flux detecting elements 1d and 1e. A workability is rendered superior and manufacture costs can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic flaw detector for an elevator rope for detecting a broken wire of a main rope used in an elevator.

[0002]

2. Description of the Related Art Conventionally, a magnetic flaw detector for detecting a break in a main rope used in an elevator has conventionally formed a magnetic circuit using two magnets provided in a detecting unit, and is capable of detecting a leakage magnetic flux leaking from a damaged part. Was to be detected. Further, in order to make the detection of the leakage magnetic flux highly accurate over the entire circumference of the rope, a second leakage magnetic flux detection means for detecting the leakage magnetic flux is provided on the open side of the iron core having a U-shaped cross section. Has been proposed.

[0003] Examples of this type include those described in, for example, JP-A-62-110032 and JP-A-62-1165.

[0004]

In the above-described conventional magnetic flaw detector, since a magnetic circuit is formed by using two magnets, the detection unit for detecting the leakage magnetic flux is relatively large and heavy. It was difficult to apply and hold the detection section to the portion. In addition, there is a problem that the structure of the detection unit is relatively complicated, and the manufacturing cost is increased.

The present invention has been made in view of such circumstances in the prior art, and has as its object to provide a magnetic flaw detector for an elevator rope in which a detection unit can be made compact and simple. is there.

[0006]

SUMMARY OF THE INVENTION In order to achieve this object, the present invention relates to a magnetic flaw detector for an elevator rope having a detector for detecting breakage of a wire strand of a rope by using magnetism, wherein the detector comprises: A magnetic body that is arranged at a distance from each other so as to sandwich the rope, a magnet interposed between these magnetic bodies, and a magnetic flux detecting element that is disposed at a position facing the rope and detects a magnetic flux It has a configuration including

According to the present invention configured as described above, when detecting a wire break in a rope, the magnetic body of the detection unit is disposed so as to sandwich the rope. As a result, the magnetic flux forms a magnetic circuit in the order from the N pole of the magnet, one magnetic body, one magnetic flux sensing element, a rope, the other magnetic flux sensing element, the other magnetic body, and the S pole of the magnet. Then, the wire breakage of the rope is determined based on the magnetic flux detected by the magnetic flux detecting element. In this way, by configuring the detection unit so that the rope is sandwiched by the magnetic material, it is possible to replace the former magnetic circuit using two magnets with one magnet. It can be small and simple.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a magnetic flaw detector for an elevator rope according to the present invention will be described below with reference to the drawings.

FIG. 1 is a top view showing an embodiment of a magnetic flaw detector for an elevator rope according to the present invention, FIG. 2 is a front view of the magnetic flaw detector of FIG. 1, and FIG. 3 is an overall configuration of the magnetic flaw detector of FIG. FIG.

As shown in FIG. 3, a magnetic flaw detector for an elevator rope according to the present embodiment uses a magnetism to detect a wire breakage of a rope 2 and a sensor for driving a magnetic flux detecting element to be described later. A drive circuit 4, an output circuit 5 for adjusting the output, a squaring circuit 6 for reducing the influence of noise, a determination circuit 7 for determining whether or not the wire is broken, and a count for counting and displaying the determination result And a display circuit 8.

As shown in FIGS. 1 and 2, the detecting section 1 has L-shaped magnetic bodies 1a and 1b which are arranged to be separated from each other so as to sandwich the rope 2, and these magnetic bodies 1a and 1b. 1b and a magnetic body 1c
The magnetic flux detecting elements 1d and 1e provided on the surfaces of the magnetic members 1a and 1b facing the rope 2 and detecting the main magnetic flux 3 of the magnetic circuit, and the magnetic members provided on the non-facing surfaces of the magnetic members 1a and 1b with the rope 2. Shielding means, for example, magnetic shielding plates 1f, 1g, output lines 1h, 1i connected to magnetic flux detecting elements 1d, 1e, and double-sided adhesive tapes 1k, 1j for fixing magnetic shielding plates 1f, 1g to magnetic bodies 1a, 1b. And The magnetic flux detecting elements 1d and 1e are arranged on the same stranded wire of the rope 2, that is, so as to form a pair at the center of a half circumference of the same stranded wire.

In this embodiment, when detecting a wire breakage of the rope 2 using magnetism, the rope 2 is sandwiched between the magnetic bodies 1a and 1b of the detection unit 1. As a result, the main magnetic flux 3 is formed in the magnetic circuit formed in the order of the N pole of the magnet 1c, the magnetic body 1a, the magnetic sensing element 1d, the rope 2, the magnetic sensing element 1e, the magnetic body 1b, and the S pole of the magnet 1c. The main magnetic flux 3 is always detected by the magnetic flux detecting elements 1d and 1e, and is output to the determination circuit 7 via the output lines 1h and 1i, the sensor driving circuit 4, the output circuit 5, and the squaring circuit 6 as output signals. The determination circuit 7 determines whether the wire is broken.

That is, when there is no wire break in the rope 2, the main magnetic flux 3 is stable and the magnetic flux detecting elements 1d, 1e
Outputs a constant output signal, but if there is a wire break, the main magnetic flux 3 decreases because the magnetic resistance of the magnetic circuit increases, and the output signals output by the magnetic flux detecting elements 1d and 1e also increase. Decrease. In response to the decrease in the output signal, the determination circuit 7 determines that the wire is broken, and the count display circuit 8 displays the result of the determination.

In general, since an elevator is provided with a plurality of ropes, another rope is adjacent to the rope 2, and when the detector 1 performs a flaw detection operation on the rope 2, a magnetic material is used. 1a and 1b may come in contact with another rope (not shown). In this way, the magnetic material 1
When a and 1b come into contact with each other, a new magnetic circuit is equivalently connected to the magnetic circuit. As a result, a change occurs in the main magnetic flux 3 and even if the rope 2 does not have a broken wire,
In some cases, a detection signal may be obtained as if there is a wire break. However, since the magnetic bodies 1a and 1b of the present embodiment are provided with the magnetic shielding plates 1f and 1g on the surfaces not facing the ropes 2, the magnetic circuit is connected even if they contact other ropes. There is no.

In the embodiment configured as described above, the detection unit 1 is configured so that the rope 2 is sandwiched between the magnetic bodies 1a and 1b, so that a magnetic circuit is conventionally formed using two magnets. One magnet can be used, and thus the detection unit 1 can be small and simple. Specifically, the detection unit 1 is replaced with a conventional one.
/ 2 or less, and the production cost is reduced to 1 /
It can be reduced to 5 or less. In addition, the magnetic bodies 1a, 1
By providing the magnetic shielding plates 1f and 1g on the non-opposite surface of the rope 2b, the magnetic circuit is not connected and the magnetism is not disturbed even when the non-detection target rope is in contact with the other rope. Highly accurate detection can be performed.

[0016]

As described above, the present invention is constructed as described above. By forming the detecting portion so as to sandwich the rope with a magnetic material, the magnetic circuit is conventionally formed using two magnets. It can be a magnet, so that the detection unit can be small and simple. Thereby, it is easy to apply and hold the detecting portion to the measuring portion of the rope, and it is possible to improve the workability and to reduce the manufacturing cost.

[Brief description of the drawings]

FIG. 1 is a top view showing one embodiment of a magnetic flaw detector for elevator ropes of the present invention.

FIG. 2 is a front view of the magnetic flaw detector of FIG. 1;

FIG. 3 is an explanatory view showing the entire configuration of the magnetic flaw detector of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Detection part 1a, 1b Magnetic body 1c Magnet 1d, 1e Magnetic flux detection element 1f, 1g Magnetic shielding plate 2 Rope 3 Main magnetic flux

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Jun Kozono 1-6-6 Kandanishikicho, Chiyoda-ku, Tokyo F-term in Hitachi Building Systems Co., Ltd. (Reference) 2G053 AA11 AB22 BA14 BB03 BC20 CA03 DB02 DB11 3F304 BA09 3F305 BB02 BC36

Claims (4)

[Claims] 1. A magnetic flaw detector for an elevator rope having a detection unit for detecting breakage of a wire strand using magnetism, wherein the detection units are arranged separately so as to sandwich the rope. A magnetic body, a magnet interposed between these magnetic bodies, and a magnet disposed at a position facing the rope;
A magnetic flaw detector for an elevator rope, comprising: a magnetic flux detecting element for detecting a magnetic flux. 2. The magnetic flaw detector for an elevator rope according to claim 1, wherein the magnetic flux detecting element is disposed on a surface of the magnetic body facing the rope, and detects a main magnetic flux of a magnetic circuit. . 3. The magnetic flaw detector for an elevator rope according to claim 2, wherein each of the magnetic flux detecting elements is arranged on the same stranded wire of the rope. 4. The magnetic flaw detector for an elevator rope according to claim 1, wherein each of the magnetic bodies is provided with magnetic shielding means on a surface not facing the rope.