JPH0737127Y2 - Amorphous label for magnetic induction - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an amorphous marker for magnetically guiding a golf cart or an unmanned guided vehicle.

[Conventional technology]

In recent years, in various distribution systems, automation of parts transportation,
An unmanned guided vehicle is adopted as a part of labor saving, and in addition to such an unmanned guided vehicle, a magnetic induction system using magnetism is known as one of the modes of the traveling control system in an automobile. In this magnetic induction type, for example, a strip-shaped marker for guidance made of a block in which ferrite powder of a magnetic material is mixed (hereinafter referred to as a ferrite block) is laid in the passage, and the marker is placed on the running cart side. It is detected by a magnetic sensor installed in the car and the cart is controlled to run along the sign.

Here, as shown in FIG. 2, the magnetic sensor includes a left-side detection coil 6 and a right-side detection coil 7, together with excitation coils 5 and 5'operated by an alternating current from an oscillator.
The lines of magnetic force output from 5, 5'link the detection coils 6, 7 so that the electromotive force generated by the electromagnetic induction action in each detection coil 6, 7 is detected. When the magnetic body 8 enters the magnetic field formed by the exciting coils 5 and 5 ', the magnetic force lines are deflected, and the magnetic outputs due to the deflected magnetic force lines are detected by the left and right detection coils 6 and 7. And, for example, when the cart is displaced to the left,
As shown in FIG. 3, the magnetic force lines interlinking the right side detection coil 7 are larger than the magnetic force lines interlinking the left side detection coil 6, and the electromotive force is also increased. The position is controlled and guidance is performed along the marker.

[Problems to be solved by the invention]

As such a magnetic body, a ferrite block in which ferrite powder is dispersed in a matrix such as resin or cement has been widely used, but when ferrite is used as a marker as described above, it is necessary for running control. In order to obtain the desired magnetism, a ferrite block having a considerably large cross section is required. Therefore, as the size of the ferrite block increases, the protrusion from the guideway surface also increases, which becomes an obstacle and causes a stumbling block for passersby, or dust easily accumulates on the protrusion. In particular, it is difficult to use it in a clean room such as electronic precision equipment that is not sensitive to dust.

Further, when the marker body of this type of ferrite block is used outdoors for guiding an unmanned guided vehicle such as a golf cart, it is not preferable in terms of rigidity against impact external force. Also,
If you lay a band-shaped sign that mixes ferrite with petroleum resin along the asphalt passage between the courses, when the outside air gets hot in summer, the sign itself becomes soft because it is mainly made of petroleum resin, and in winter it becomes soft. There is a problem in that the sign body is scraped off or abraded by an impact external force due to low temperature embrittlement or the like, which causes inconvenience in terms of durability and reduces the magnetic induction effect.

Further, in the case of the method of embedding the ferrite block in the indoor and outdoor passages to provide the guide rail band, there is a problem that the subsequent layout change is troublesome.

Therefore, the inventors of the present invention conducted a study to solve the problems of the conventional ferrite block as described above by making the marker compact and thin, and as a result, induced an amorphous metal of a ferromagnetic material more than ferrite. It has been found that these problems can be solved by adopting it as a marker. However, if the amorphous metal is used as it is, corrosion may progress under a long-term contact environment with air or rainwater, resulting in deterioration of magnetic characteristics and deterioration of mechanical strength. If such characteristics deteriorate, there is a possibility that the marker cannot be detected by the magnetic sensor mounted on the side of the traveling cart or that the marker may be damaged when an external force such as stepping on the tire of the vehicle is received. Therefore, the present inventors have conceived and studied a means of laminating with a resin in order to prevent corrosion of the amorphous metal. However, it has been found that the amorphous metal laminated with a resin improves the corrosion resistance but deteriorates the magnetic properties of the amorphous metal. Although a clear theoretical explanation for this phenomenon is not clear, it is estimated by the present inventors that the heat of the molten resin changes the amorphous metal morphology or oxidative deterioration at the time of laminating the laminate, and the shrinkage rate is caused in the cooling step. It is considered that since the resin layer having a large amount of heat is cooled in a state where tension is applied to the amorphous metal, magnetostriction occurs due to the tension and the magnetic characteristics of the amorphous metal deteriorate.

Therefore, as a result of further studies, the present inventors have found that if a specific amorphous magnetic alloy is selected, the magnetic properties are not deteriorated even by melt lamination, and the present invention has been achieved. Therefore, the present invention solves the problems when such an amorphous metal is used as a marker, and its purpose is to impart anticorrosion property without impairing the magnetic properties of the amorphous metal, An object of the present invention is to provide a labeled body that can be made smaller and thinner.

[Means for solving problems]

The present invention has the following configuration in order to solve the conventional problems and achieve the object.

That is, it is an amorphous marker for magnetic induction, which is a magnetic material in which a resin is laminated by melt lamination and is composed of a flaky cobalt-based amorphous metal plate.

[Action]

Here, the amorphous metal plate of the magnetic material is a cobalt-based amorphous metal containing cobalt (Co) as a main component as a transition metal element component, and additionally contains B, P, Si, C, etc. as a metalloid element, and a small amount. In some cases, transition metal elements other than Co such as Fe, Ni and Mo are included.

By using such an amorphous metal, the amorphous marker for magnetic induction of the present invention has a characteristic that a strong magnetic field several times per unit area can be obtained as compared with the conventional ferrite marker, and The response magnetic output to the sensor is strong. That is, the conventional ferrite type has a thickness of 1 to 5 m.
In contrast to m, the thickness of the flaky amorphous metal plate can be suppressed to an extremely thin dimension such as 30 μ or less, and the amorphous metal tends to have strong magnetic energy in the longitudinal direction of the marker. Taking advantage of the characteristics of
The size of the marker can be reduced.

Further, the meaning of melt-laminating the surface of the amorphous metal plate with a resin is to enhance rust resistance against corrosion and improve durability with time.

And, as the thermoplastic resin that can be used in the present invention, low density polyethylene, whether crystalline or amorphous,
High density polyethylene, polypropylene, poly 1-pentene, poly 4-methyl-1-pentene or ethylene,
Polyolefin such as random or block copolymers of α-olefins such as propylene, 1-butene, 4-methyl-1-pentene, ethylene / acrylic acid copolymer, ethylene / vinyl acetate copolymer, ethylene / vinyl alcohol Copolymer, ethylene / vinyl compound copolymer such as ethylene / vinyl chloride copolymer, polystyrene, acrylonitrile / styrene copolymer, ABS, methyl methacrylate / styrene copolymer, α-methylstyrene / styrene copolymer Styrene resin such as polyvinyl chloride,
Polyvinylidene chloride, vinyl chloride / vinylidene chloride copolymer, polyvinyl compounds such as polymethyl acrylate and polymethyl methacrylate, nylon 6, nylon 6-6,
Any resin such as polyamide such as nylon 6-10, nylon 11 or nylon 12, thermoplastic polyester such as polyethylene terephthalate or polybutylene terephthalate, polycarbonate, polyphenylene oxide or the like or a mixture thereof may be used. Desirable properties for the coating layer are low water vapor or oxygen permeability, no water absorption, high surface strength, and weather resistance. Olefin-based resins are preferable, and those containing at least a graft-modified polyolefin of an unsaturated carboxylic acid from the aspect of adhesiveness with an amorphous metal plate are preferable, and as an example thereof, a maleic anhydride graft-modified polyolefin or unmodified with it. An example is a mixture with a polyolefin.

The resin is melt laminated onto the amorphous metal plate by known means. The thickness of the resin layer formed by lamination is appropriately determined, but is usually 250 μm or less.

The marking body thus formed is attached along the passage so as to have a substantially band shape. The presence of the marker in the magnetic field formed by the excitation coil of the magnetic sensor provided on the vehicle side of the golf cart or the like causes the magnetic field lines to be deflected, and the magnetic output due to the deflected magnetic field lines is detected by the detection coil of the vehicle side magnetic sensor. To detect. Based on this detection signal, the cart is controlled so as to travel along a predetermined guide path by the sign.

〔Example〕

Hereinafter, examples of the amorphous marker for magnetic induction according to the present invention will be described in comparison with comparative examples.

Here, the magnetic properties of the amorphous metal plate before melt lamination were measured, and then the magnetic properties were measured when polyethylene was melt laminated on the amorphous metal plate using maleic anhydride grafted polyethylene as an adhesive layer.

And the amorphous metal of the magnetic material is Fe ・ B ・ Si
The magnetic characteristics of the metal compositions of Fe, B, Si, Cr, Co, Fe, Ni, Mo, B, and Si were measured.

Further, this amorphous metal plate is a test piece T having a thickness of 0.028 mm and a size of 50 mm × 300 mm in length and width.
Then, as shown in FIG. 1, a thermoplastic resin is melt-laminated on both surfaces of the amorphous metal plate 1 to a thickness of 150.
A μ coating layer 2 was formed.

The method for measuring the magnetic characteristics is to assume a distance between an amorphous marker for magnetic guidance provided on the road surface and the magnetic sensor on the vehicle side, and detect the magnetic sensor at a position, for example, 100 mm away from the amorphous metal. Magnetism was detected at an equivalent voltage (mV) at 40KHZ.

The above results are shown in Table 1.

As is clear from the comparison of Table 1, when the coating layer is formed on the cobalt-based amorphous metal, it does not affect the magnetic strength or weakness of the amorphous metal plate 1 as a ferromagnetic material, and the magnetic characteristics hardly change.

In parallel with this, when the same measurement was attempted on a conventional ferrite labeled body (1 × 50 × 300 mm), the detected voltage of the labeled body of the example was 41.0 mV, whereas that of the conventional ferrite labeled body. The detection voltage was about 10 mV. From this, it is clear that the magnetic recording medium of the embodiment can obtain remarkably large magnetic characteristics.

That is, since the output voltage per unit area is several times larger than that of the conventional ferrite marker in the case of the marker of the embodiment, the thickness and width of the marker can be reduced accordingly. Further, since the detection distance can be made large, the vehicle height can be increased and the reliability can be further improved. In addition, the anticorrosion property is improved, and stable properties can be exhibited for a long time.

As mentioned above, a release paper coated with a pressure-sensitive adhesive is attached to the back surface of the extremely thin band-shaped marking body, and the release paper is peeled off during on-site construction, and then only the marking body on the passage. It is convenient if it is attached to the planned taxiway.
By adopting this release paper peeling structure, it is easy to change the layout thereafter.

[Effect of device]

As explained above, the amorphous magnetic marker for magnetic induction according to the present invention has a magnetic response output per unit area to the magnetic sensor which is several times larger than that of the conventional ferrite marker, and the thickness and width of the marker are large. It is possible to significantly reduce the size of each of the above, there is no protrusion from the surface of the traffic zone, there is no concern about dust accumulation, and it is particularly suitable as a guide sign zone in a clean room. Further, the coating layer according to the present invention does not deteriorate the magnetic properties of the amorphous metal plate, and is protected by this coating layer even when it is laid outdoors as an inductive marking strip for golf carts, Since the rust preventive property against corrosion is increased, the durability with time is improved. Furthermore, it is easy to perform on-site construction regardless of whether it is indoors or outdoors, and it is easy to change the layout after construction.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of an embodiment of an amorphous marker for magnetic induction according to the present invention, and FIGS. 2 and 3 are principle diagrams showing detection of a marker by a magnetic sensor. 1 ... Amorphous metal plate, 2 ... Covering layer, 3 ... Adhesive layer.

Claims (1)

[Scope of utility model registration request] 1. An amorphous marker for magnetic induction, which is a magnetic material in which a resin is laminated by melt lamination and is composed of a flaky cobalt-based amorphous metal plate.