JPS595025Y2 - Electromagnet adsorption steel plate number detection device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device for detecting the number of steel plates attracted by a lifting electromagnet used in steel plate cargo handling operations.

When lifting and transporting a large number of steel plates using a lifting electromagnet,
It is necessary to detect the thickness or number of steel plates to be suspended.

Therefore, by utilizing the magnetic saturation of the steel plate magnetic path formed in the attracted steel plate, and focusing on the phenomenon that the magnetic flux density of the iron core increases as the number of attracted steel plates increases, we installed a magnetically sensitive element in the magnetic path. A detection device has been proposed that includes a magnetic detector and detects changes in magnetic flux density by converting them into electrical signals.

A conventional steel plate number detection device has a cutout gap in a part of the adsorption surface of an electromagnetic ironstone core, and a detector is inserted into this gap.
It is configured to detect the number or thickness of steel plates by detecting magnetic flux passing through the iron core and steel plates.

Incidentally, regardless of whether the electromagnet is used continuously or intermittently, the temperature of the electromagnet's coil increases due to energization, and this increased temperature is conducted to the detector through the iron core, causing an adverse effect.

This becomes more noticeable the longer the time when the coil is energized.

That is, an increase in the temperature of the detector causes unstable operation of the detector, resulting in a detection error.

One way to prevent the temperature of the electromagnet from rising is to increase the heat radiation area of the coil or the heat radiation area of the entire electromagnet, but this method requires increasing the size of the electromagnet itself, which is uneconomical.

This invention was devised to solve the above-mentioned conventional problems, and proposes a steel plate number detector that can detect the number of steel plates with high accuracy.

This invention will be explained below with reference to illustrated embodiments.

First, in the embodiment shown in FIGS. 1 to 3, 1 is a lifting electromagnet, and a steel plate number detection device 2 is attached between the left and right electromagnetic points 1 and 1 by a connecting body 3. 3, a predetermined opposing distance is ensured between the detection device 2 and the electromagnetic point 1.degree. 1, thus forming an air insulation layer A.

The electromagnet 1 is provided with a plurality of iron cores 4, an excitation coil 5 is wound around each iron core 4, and a lower end (hereinafter referred to as a magnetic pole 6) of the iron core 4 serving as an attraction portion is provided to protrude.

The steel plate number detection device 2 has an independent iron core 7 and an excitation coil 8 to form a magnetic path separate from the iron core 4 of the electromagnet 1, and the lower magnetic pole 9 of the iron core 7 has a magnetically sensitive coil covered with a non-magnetic material 10. A magnetic detector 11 such as an element is provided.

Note that the magnetic detector 11 may be integrated into a unit by being incorporated into the non-magnetic body 10 in advance, which simplifies adjustment and maintenance.

Thus, by attaching the detection device 2 via the coupling body 3, an air insulation layer A is formed, and the heat of the electromagnet 1 caused by energizing the excitation coil 5 is thermally insulated by the air insulation layer A, thereby preventing heat conduction. Therefore, the detector 11 can be operated satisfactorily at an appropriate temperature.

Furthermore, since the time required to detect the number of steel plates may be short, the time for energizing the excitation coil 8 of the detection device 2 is short.

Therefore, the amount of heat generated by the detection device 2 itself is not small and does not affect the detector 11 in any way, making it possible to perform highly accurate detection.

Furthermore, by forming the air heat insulating layer A through the connecting body 3, an independent magnetic circuit is formed that is separate from the magnetic circuit of the electromagnet 1, and interference of mutual magnetic flux can be prevented. Improves detection accuracy.

Next, the embodiment shown in FIGS. 4 to 6 will be described.

In this embodiment, the steel plate number detection device 20 does not have an iron core and a coil exclusively for detection, but uses one of the plurality of iron cores 22 and coils 23 (iron core 22a, coil 23a) of the lifting electromagnet 21. It is configured as follows.

That is, as shown in FIGS. 5 and 6, the iron core 22 a
A magnetic detector 25 covered with a non-magnetic material 24 is arranged inside.

The iron core 22a is thermally insulated from the main body of the electromagnet 21 via the connecting body 26 and the heat insulating layer 27.

The heat insulating layer 27 may be an air layer or may be formed of a suitable heat insulating material, and this is the same in the above embodiment (insulating layer A).

In this way, the magnetic detector 25 is protected from the heat generated by the coil 23 by the coupling body 26 and the heat insulating layer 27.
Unstable operation due to temperature rise can be prevented, and highly accurate detection can be performed.

Furthermore, this embodiment is economical because the iron core 22 of the lifting electromagnet 21 is effectively utilized.

As described above, according to this invention, since the steel plate number detector is thermally insulated from the lifting electromagnet, it is possible to prevent the influence of temperature changes, and it is possible to detect the number of sheets with good quality and high accuracy. can do.

[Brief explanation of the drawing]

FIG. 1 is an elevational view showing the installed state of a steel plate number detection device in one embodiment, FIG. 2 is a bottom view thereof, FIG. 3 is a partially enlarged vertical sectional view showing the internal structure of the detection device and electromagnet, and FIG. 4 is an external elevational view of an electromagnet in another embodiment, and FIG. 5 is a partially enlarged view showing the internal structure of the detection device and the electromagnet.
FIG. 6 is a partial bottom view showing the insulation structure of the iron core. ...Lifting electromagnet, 2... Steel plate number detection device, 3... Connecting body, A... Air insulation layer, 4...・Iron core, 5...Excitation coil, 6...Magnetic pole, 7...Iron core, 8 Excitation coil, 9...Magnetic pole, 10... - Non-magnetic material, 11... Magnetic detector, 20... Steel plate number detection device, 21... Lifting electromagnet, 22...
...Iron core, 22 a...Iron core, 23...
...Coil, 23 a...Coil, 24...
...Nonmagnetic material, 25...Magnetic detector, 26.
...Connection body, 27... Heat insulation layer.

Claims (2)

[Scope of utility model registration request] (1) In a steel plate number detector that is installed on a lifting electromagnet and detects the number of attracted steel plates by detecting the magnetic flux passing through the steel plate during attraction, the steel plate number detector is thermally insulated from the electromagnet. A device for detecting the number of steel plates attracted by an electromagnet, characterized in that the number of steel plates is detected by an electromagnet. (2) The electromagnet according to claim 1 of the utility model registration claim, characterized in that the steel plate number detector is arranged in an iron core that is magnetically separated from the iron core of the lifting electromagnet through a non-magnetic material. A device for detecting the number of adsorbed steel plates.