JP2514978B2 - Magnetic amorphous sign for vehicle guidance - Google Patents

Description

TECHNICAL FIELD The present invention relates to an amorphous marker that magnetically guides a golf cart or an unmanned guided vehicle.

[Conventional technology]

Recently, in various physical distribution systems, unmanned guided vehicles have been adopted as part of automation and labor saving of parts transportation. In addition to such unmanned guided vehicles, the use of magnetism is one of the forms of running control systems in automobiles. A magnetic induction method is known. This magnetic induction type is, for example,
A guide band-shaped sign made of a block containing magnetic ferrite powder (hereinafter referred to as a ferrite block) is laid in the passage, and the sign is detected by a magnetic sensor installed on the side of the running cart. Controls the vehicle to run along the sign.

Here, as shown in FIG. 2, the magnetic sensor is provided with a left side detection coil 12 and a right side detection coil 13 together with exciting coils 11 and 11 'which are operated by an alternating current from an oscillator. The magnetic force lines output from the detection coils 1
By interlinking 2 and 13, the electromotive force generated by the electromagnetic induction action in each detection coil 12 and 13 is detected. Then, when the magnetic body 14 enters the magnetic field formed by the exciting coils 11 and 11 ', 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 12 and 13. Then, for example, when the cart is deviated to the left side, as shown in FIG. 3, the left side detection coil 12 has more magnetic force lines interlinking the right side detection coil 13 than the magnetic force lines interlinking, and the electromotive force thereof becomes larger. Based on this detection data, the cart is positionally controlled to the left and right and guided along the sign.

[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 conventionally used in many cases, but when ferrite is used as a marker as described above, it is used for traveling control. A ferrite block with a fairly large cross section is required to obtain the desired magnetism 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 strip-shaped sign that mixes ferrite with petroleum resin along the asphalt path between the courses,
In the summer, when the outside air becomes hot, the sign itself softens because it is mainly made of petroleum resin, and in the winter it becomes low temperature embrittlement, etc. However, there is a problem that the inconvenience occurs and the magnetic induction effect decreases.

Furthermore, in the case of a system in which a ferrite block is embedded in an indoor or outdoor passage to provide a railroad track for a dielectric, there is a problem in that subsequent layout changes are troublesome.

Therefore, as a result of repeated studies to solve the problems of the conventional ferrite block as described above by reducing the size and thickness of the marker, the present inventors have induced a more amorphous amorphous metal than ferrite. It has been found that these problems can be solved by adopting it as a marker.

On the other hand, if the amorphous metal is used as it is, corrosion may progress in a long-term contact environment with air, rainwater, or the like, resulting in deterioration of magnetic properties and mechanical strength. If the characteristics are deteriorated, the marker cannot be detected by the magnetic sensor mounted on the side of the traveling cart, and the vehicle tire may be stepped on and damaged by external pressure.

From these points, the present inventors have studied to solve the above-mentioned various problems by covering the surface of the amorphous metal with resin concrete. The purpose of the present invention is to impart weather resistance, water resistance, heat resistance, corrosion resistance, cold resistance, impact resistance, abrasion resistance, etc., without impairing the magnetic properties of amorphous metal, to reduce the size and The object is to provide a labeled body that can be made 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, a primer layer made of synthetic resin is formed by coating between a flaky amorphous metal plate made of a magnetic material installed on the passage of a vehicle and the passage surface, and the upper surface of the amorphous metal plate is coated with resin concrete. Further, a top coat made of synthetic resin is applied on the upper surface.

[Action]

The amorphous metal plate has a strong magnetic output several times per unit area as compared with the conventional ferrite label. That is, while the conventional ferrite type has a thickness of 1 to 5 mm, it is possible to suppress the thickness of the flaky amorphous metal plate to an extremely thin dimension such as 30 μm or less, and By taking advantage of the characteristics of the amorphous metal which tends to have strong magnetic energy in the longitudinal direction, the size of the marker can be reduced.

In addition, by covering the amorphous metal plate installed on the passage with resin concrete, it becomes excellent in weather resistance, water resistance, heat resistance, corrosion resistance, cold resistance, impact resistance, abrasion resistance, etc. Can be improved.

The marking body thus formed is installed along the passage so as to form 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.

Here, the amorphous metal of the magnetic material has a composition such as Fe / B / Si-based, Fe / B / Si / Cr-based, Fe / Ni / Mo /
Examples include B-based and Co-Fe-Ni-Mo-B-Si-based materials, and Co-based materials are more preferable in terms of ferromagnetism.

Further, before covering with resin concrete, one or both sides of the amorphous metal plate may be covered with a resin film, and the raw material of the resin film may be crystalline or amorphous, low density polyethylene, high density polyethylene, Polypropylene, poly-1-pentene, poly-4-methyl-1-pentene or ethylene, propylene, 1-pentene, 4
Polyolefin such as random or block copolymer of α-olefins such as -methyl-1-pentene, ethylene / acrylic acid copolymer, ethylene / vinyl acetate copolymer, ethylene / vinyl alcohol copolymer, ethylene / chlorination Ethylene / vinyl compound copolymer such as vinyl copolymer, polystyrene, acrylonitrile / styrene copolymer, ABS, styrene resin such as methyl methacrylate / styrene copolymer, α-methylstyrene / styrene copolymer, poly Polyvinyl compounds such as vinyl chloride, polyvinylidene chloride, vinyl chloride / vinylidene chloride copolymer, polymethyl acrylate, polymethyl methacrylate, nylon 6, nylon 6-6, nylon 6-10, nylon
Any resin such as polyamide such as 11, nylon 12 or the like, thermoplastic polyester such as polyethylene terephthalate or polybutylene terephthalate, polycarbonate, polyphenylene oxide or the like or a mixture thereof can be used. The thickness of the amorphous metal plate covered with the film is about 100 to 500 μ, preferably about 200 to 300 μ.

As the resin concrete used in the present invention, resin concrete having a binder such as acrylic resin, epoxy resin, unsaturated polyester resin, vinyl ester resin, polyurethane resin or phenol resin can be used.

Examples of the acrylic resin-based resin concrete include, for example, at least one monomer component selected from (meth) acrylic acid and its ester, and an acrylic resin-based resin concrete whose main component is a polymer soluble or swellable in the monomer component. Can be used, and more specifically,
(A) a monomer of (meth) acrylic acid and / or an ester thereof, (b) a polymer that is soluble or swellable in the monomer component, (c) a plasticizer that is soluble in the monomer component, and (d) 1 Examples thereof include compounds having at least two polymerizable unsaturated bonds in the molecule.

Examples of the monomer (a) include alkyl (meth) acrylates such as methyl acrylate, ethyl acrylate, methyl methacrylate, and ethyl methacrylate, acrylic acid, methacrylic acid, 2-hydroxyethyl acrylate, and methacrylic acid-2. -Hydroxyethyl, ethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, polyethylene glycol di (meth)
Acrylate, polypropylene glycol di (meth) acrylate, butylene glycol di (meth) acrylate, hexylene glycol di (meth) acrylate, 2,
2-bis [4- (meth) acryloyloxyphenyl]
Propane, 2,2-bis [4- (meth) acryloyloxycyclohexyl] propane, 2,2-bis [3- (meth) acryloyloxy-2-hydroxypropoxyphenyl] propane, trimethylolpropane tri (meth) acrylate , Ventaerythritol tetra (meth) acrylate, dipentaerythritol hexa (meth) acrylate, and the like.

As the polymer (b), the above monomers, especially (meth)
A homopolymer or a copolymer of acrylic acid ester can be exemplified, and examples of the plasticizer (c) include dimethyl phthalate, dibutyl phthalate, dicyclohexyl phthalate, dipentyl phthalate, dioctyl phthalate, di-2-ethylhexyl phthalate, diisodecyl phthalate, butylbenzyl phthalate. Representative examples thereof include phthalates.

Further, an internal plasticizer such as an α, β-unsaturated carboxylic acid ester which is copolymerizable with (a) such as diethyl maleate, dibutyl maleate, dioctyl maleate, dibutyl fumarate, dioctyl fumarate can also be mentioned. . Typical examples of the polymerizable unsaturated bond compound (d) include ethylene glycol di (meth) acrylate and 1,2.
-Propylene glycol di (meth) acrylate, 1,3
-Butylene glycol di (meth) acrylate, 1,4-
Alkanediol di (meth) acrylates such as butylene glycol di (meth) acrylate, 2,2-bis [3
Examples include (meth) acrylic acid-modified products of epoxy resins such as-(meth) acryloyloxy-2-hydroxypropoxyphenyl] propane and trade name Lipoxy VR-60 or Lipoxy VR-90 manufactured by Showa Highpolymer Co., Ltd. .

Generally, the blending ratio of each of these components is such that the monomer component (a) is 45 to 85 wt%, the polymer (b) is 5 to 20 wt%,
The plasticizer (c) is 1 to 25 wt% and the balance is (d).

Such acrylic resin concrete can be cured by adding a polymerization initiator and, if necessary, amines as a room temperature curing accelerator.

As the polymerization initiator, diacyl peroxide,
Alkyl peroxides, aralkyl peroxides, peroxides such as peracids and peresters, azo compounds and the like can be used, and of these, diacyl peroxide is preferably used. Specific examples of the diacyl peroxide include dibenzoyl peroxide, diacetyl peroxide, dicapryl peroxide, dilauroyl peroxide, distearoyl peroxide and the like.

As the amines, any of a primary amine and a secondary amine can be used, but a tertiary amine is preferably used. Specifically, aniline, toluidine, xylidine, phenylenediamine, N, N-dimethylaniline, N, N
-Diethylaniline, N, N-di (β-hydroxyethyl) aniline, N, N-dimethyltoluidine, N, N-diethyltoluidine, N, N-dimethylanisidine, N, N-diethylanisidine, N, N -Dimethyl-pt-butylaniline, N, N-diethyl-pt-butylaniline, N, N-dimethyl-p-chloroaniline, diphenylamine, N, N
Examples thereof include-(β-hydroxyethyl) -p-toluidine. Among these, N, N-dimethyl-p-toluidine, N, N-dimethyl-p-butylaniline, N, N-dimethylanisidine, N, N-dimethyl-p-chloroaniline, N, N-bis (Β-hydroxyethyl)-
A tertiary amine having a substituent of an electron donor at least at the p-position of benzenes such as p-toluidine is preferable, and N,
N-dimethyl-p-toluidine, N, N-dimethyl-pt
-Butylaniline is particularly preferred.

The mixing ratio of the polymerization initiator and amines to the resin concrete is approximately 0.1 to 20 parts by weight for the former and 0.1 to 20 parts by weight for the latter with respect to 100 parts by weight of the resin concrete composed of (a) to (d). .

Further, solid paraffin, preferably paraffin wax having a melting point of 40 to 60 ° C., is preferably added in order to prevent the surface curing reaction from being insufficiently progressed by radical scavenging by oxygen in the air. The mixing ratio of this paraffin to the resin concrete is 0.1 to 1.0 part by weight with respect to 100 parts by weight of the resin concrete comprising (a) to (d).

Even when an epoxy resin, an unsaturated polyester resin, a vinyl ester resin, a polyurethane resin, or a phenol resin is used, a curing agent, a curing accelerator, a filler such as calcium carbonate or finely divided silica, a pigment, etc. are appropriately added in the usual manner.

Among them, the resin concrete using the unsaturated polyester resin has a large surface hardness and is preferably used in the present invention. The unsaturated polyester resin can be obtained by mixing an unsaturated polyester obtained by a polycondensation reaction of a glycol compound and an unsaturated dicarboxylic acid with a vinyl compound such as styrene and curing the mixture using a radical polymerization catalyst such as benzoyl peroxide.

Further, as the binder, a mixture of the above various resins and cement can be used.

As cement, hydraulic cement such as Portland cement, alumina cement, burnt gypsum, blast furnace cement, latent hydraulic cement such as high sulfate slag cement, lime slag cement, keens cement, silica cement, fly ash cement, lime silica Examples thereof include cement, alkali silicate, oxychloride cement, mixed cement such as phosphate cement, and lime, dolomite plaster, air-cured cement such as magnesia, and the like.

As a method for mixing the cement and the resin, for example, water is added to the cement to form a cement slurry, and in the cement slurry, the monomer of the resin is emulsified with an emulsifier, and a polymerization catalyst is added thereto to carry out polymerization /
It can be hardened and dried to concrete.

The aggregate used for the resin concrete may be any inorganic particulate material such as silica sand.

Instead of putting pigments in the binder, organic pigments such as Benzicine Yellow, Hansa Yellow, Resole Red, Alizarin Lake, Pigment Scarlet 3B, Brilliant Carmine 6B, titanium oxide, zinc white, lithobon, white lead are used. It may be colored with an inorganic pigment such as cadmium yellow, yellow lead, titanium yellow, etc. If the amorphous metal plate is covered with resin concrete using such colored aggregate, the position of the marker can be clearly recognized by coloring. Further, the position of the marker can be known from the reflection of light by using a light-reflecting material such as glass beads as the aggregate.
In this way, by making the position of the marker visible,
No obstacles will be placed on the path of the traveling cart.

Alternatively, a particulate magnetic material may be used as the aggregate. As the magnetic material, it is possible to use other magnetic materials such as ferrite, sand iron, etc. in addition to the amorphous alloy of the above-mentioned components. When the particulate magnetic material is used as an aggregate of resin concrete, the action of the amorphous metal plate can be assisted.

The amorphous marker of the present invention lays an amorphous metal plate covered with an amorphous metal plate or a resin film on the passage surface of asphalt concrete or cement concrete, and applies the resin concrete in a larger area than the amorphous metal plate. At that time, the primer is applied to the passage surface wider than the area of the amorphous metal plate, and the amorphous metal plate or the amorphous metal plate covered with the resin film is placed at the center of the application surface of the primer, and It is better to cover it with resin concrete from above. Before covering with resin concrete, an amorphous metal plate or an amorphous metal plate covered with a resin film may be covered with a glass mat and then covered with resin concrete.
Further, a top coat is formed on the resin concrete. The top coat may be formed by applying the same synthetic resin as the binder, which is a component of the resin concrete. By doing so, the resin concrete and the top coat are well adhered, the top coat is not easily peeled off, and the durability of the resin concrete can be further improved. Further, silica sand or the like may be mixed in the top coat layer to increase the strength of spike shoes on a golf course. The thickness of the entire marker body covered with these is 1 to 5 mm, preferably 1 to 2 mm.

Here, the primer is for increasing the adhesiveness of the resin concrete to the passage surface. As this primer, it is preferable to use the same synthetic resin as the synthetic resin that is the binder of resin concrete. In this way, the primer and resin concrete will bond extremely well.

For example, as a primer for acrylic resin concrete, a composition comprising the above-mentioned (a), (b), (c), and (d), or a composition described in JP-A-60-239349 by the applicant of the present application In the composition containing (a) and (b) as a main component, at least 2 is contained in one molecule.
At least one hydroxyl group of the alkane polyol or polyoxyalkane polyol having one hydroxyl group forms an ester of (meth) acrylic acid,
An example is a composition containing a polysynthetic compound having a structure in which at least one hydroxyl group forms an ester of unsaturated polycarboxylic acid or orthophosphoric acid. When this latter composition is used, sufficient adhesive strength can be obtained even on a wet substrate surface.

The primer may be applied not only on the passage surface but also on the upper surface of the amorphous metal plate.

The glass mat is a woven or non-woven fabric of glass fibers and is used to improve the adhesion of the resin concrete to the amorphous metal plate. Therefore, a cloth made of carbon fiber, synthetic fiber, or the like can be used as long as it has the same effect.

〔Example〕

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

In the marker of this example, the primer 1 (Silica R-51) consisting of (a) to (d) described above was applied on the asphalt passage surface, and the amorphous metal plate 2 was placed thereon, and Is covered with a non-woven mat 3 of glass fiber, and further on it is covered with a resin concrete 4 in which the binder (silica R-61) of (a) to (d) is mixed with silica sand as an aggregate, and finally the resin concrete 4 The top coat layer 5 is formed by coating the composition (Silica R-71) comprising the above (a) to (d) on the top.

Amorphous metal plates with a thickness of 28μ, a width of 50 mm and a length of 300 mm are used. Fe / B / Si system, Fe / B / S
i ・ Cr system, Fe ・ Ni ・ Mo ・ B system, Co ・ Fe ・ Ni ・ Mo ・ B
・ The test was performed for each of the Si-based metal compositions. The total thickness of the obtained labeled body was 2 mm.

Measurement of magnetic properties was carried out on the labeled body of the example, and
Both the same type of amorphous metal plate alone was used. The measuring method assumes the distance between the magnetic marker on the side of the road and the magnetic sensor on the vehicle side, and the magnetic field detected by the magnetic sensor is 40 KHZ, for example, at a position 100 mm away from the amorphous metal. The voltage (mV) equivalent to this was detected.

 The above results are shown in Table 1.

As is clear from the comparison in Table 1, when the amorphous metal plate is covered with resin concrete, there is almost no change in the strength or weakness of the magnetic properties of the amorphous metal plate 1 as a ferromagnetic material.

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 27.2 to 39.4 mV, whereas the conventional ferrite labeled body was detected. The detection voltage of the body 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. Further, weather resistance, water resistance, heat resistance, impact resistance, abrasion resistance, chemical resistance, and corrosion resistance are improved, and stable characteristics can be exhibited for a long period of time.

〔The invention's effect〕

As described 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 has a thickness and a width as a marker. Each dimension of can be greatly reduced.

Further, by covering with the resin concrete of the present invention, without deteriorating the magnetic characteristics of the amorphous metal plate, weather resistance, water resistance, heat resistance, impact resistance, abrasion resistance, chemical resistance, corrosion resistance, etc. It is possible to obtain a stable effect over a long period of time, and it can be used outdoors as a guide sign belt for golf carts, etc., or in places where it is necessary to sterilize the floor with a disinfectant such as a food factory. Can also be suitably used. Further, by forming the primer layer, the sign can be easily and firmly adhered to the passage of the vehicle, and the surface of the resin concrete is covered with the top coat, so that the sign is sufficiently protected.

[Brief description of 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 ... Primer layer, 2 ... Amorphous metal plate, 3 ...
… Glass mat, 4 …… resin concrete, 5 …… top coat layer.

Claims (3)

(57) [Claims] 1. A primer layer made of a synthetic resin is applied and formed between a flaky amorphous metal plate which is a magnetic material installed on a passage of a vehicle and a passage surface, and the upper surface of the amorphous metal plate is made of resin concrete. A magnetic amorphous marker for vehicle guidance, characterized in that it is coated with and a top coat made of synthetic resin is applied on the upper surface. 2. The magnetic amorphous marker for vehicle guidance according to claim 1, wherein the resin concrete is an acrylic resin-based resin concrete. 3. The magnetic amorphous marker for vehicle guidance according to claim 1 or 2, wherein the primer layer and the top coat are made of the same synthetic resin as the binder of the resin concrete.