JPH10273278A - Lifting electromagnet for high temperature steel product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lifting electromagnet for a high temperature steel produce excellent in heat resistance without generating heat decomposition gas. SOLUTION: First, in a constitution, as a coil 1 of this lifting electromagnet, an inorganic insulated wire is used. Second, in a constitution, relating to the coil 1, a varnish (inorganic varnish) of inorganic system resin is used, combination of the first/second constitution is considered. Further, by using a compound conductor of copper system as the conductor in the coil 1, heat resistance and strength of this lifting electromagnet are more improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a lifting electromagnet for high-temperature steel used in steel works.

[0002]

2. Description of the Related Art Conventionally, high-temperature billets (500 to 60
A lifting electromagnet for high-temperature steel materials has been used for lifting and transferring (0 ° C.). The configuration of this conventional lifting electromagnet will be described with reference to FIG. FIG. 2 is a perspective view of the above-described conventional lifting electromagnet 20.
Reference numeral 0 denotes a coil 21, a magnetic pole (an outer pole 22, an inner pole 23), a yoke 24, a compound 25, and a bottom plate 26. As the coil material, a Nomex tape wound aluminum conductor wire or a glass wound aluminum conductor wire is used. ing. The coil 21 is wound around a spool 29 via an insulator, impregnated with a compound 25, and molded.
Its periphery is surrounded and sealed by a welded yoke 24 and bottom plate 26. Further, a heat shield plate 30 is provided below the bottom plate 26 to make it difficult for the heat from the object 27 (billet) to be transmitted to the coil 21.

When the coil 21 is energized, a billet 27, magnetic poles (outer pole 22, inner pole 23), a spool 29,
A magnetic path is formed between the yokes 24, and the billet 27 is attracted to the magnetic pole. Billet 27 received by lifting electromagnet 20
Is transmitted from the magnetic pole to the yoke 24,
The heat is dissipated from the surface to the atmosphere, but part of the heat passes from the magnetic pole through the bottom plate 26, the heat shield plate 30 or the spool 29,
It reaches Compound 25. The Joule heat of the coil 21 passes through the compound 25 and is radiated from the surface of the yoke 24 to the atmosphere.

[0004]

In the conventional lifting electromagnet, if a billet in a high temperature state of 500 to 600 ° C. is lifted for a long time, the compound (epoxy resin) may be overheated by the heat of the billet. In addition, if the lifting electromagnet is reduced in size and weight, the heat radiation area decreases, the coil temperature increases, and the compound is overheated. When the compound is overheated at a high temperature, it is thermally decomposed to generate pyrolysis gas, and when this accumulates inside the lifting electromagnet, the internal pressure of the lifting electromagnet increases. The coil and the spool were pushed down by this internal pressure, the spool bolt fixing the spool and the yoke was cut, and the bottom plate swelled, resulting in a problem. Furthermore, when a Nomex tape wound aluminum conductor wire is used as the coil wire, there is a problem in strength.

[0005] As a first countermeasure for the above-mentioned problem, there is provided a structure in which a gas vent hole is formed in an upper portion of a yoke and an air breather is attached so as to communicate with the gas vent hole, and a protective cover is attached to protect the air breather. Also,
Prior art exists in the configuration in which a drill bolt is attached instead of an air breather.

As a second countermeasure for the above problem, the compound of the coil is divided into two parts, a yoke side and a bottom plate side, and the compound on the bottom plate side is made of a shape or material which makes it difficult to transmit heat from the high-temperature steel to the coil. There is also a prior art in which the compound on the yoke side is configured to suppress the rise in temperature of the coil by using a shape or a material for dissipating heat generated from the coil.

When the air breather is mounted as a first measure, the problem of the bottom plate swelling is solved. However, the outside air flows backward through the gas vent hole, and the moisture contained in the outside air causes the coil to be inflated. There arises a problem that the insulation property is deteriorated and a problem that the organic gas is released into the atmosphere and the safety is impaired.

[0008] In addition, the second measure is to divide the coil compound into two parts, the yoke side and the bottom plate side, to suppress the temperature rise of the coil. Will be reduced,
Depending on the calorific value of the high-temperature steel material and the time required for lifting, there arises a problem that a pyrolysis gas is generated from the epoxy resin used for the compound for the coil electric wire and the yoke side.

An object of the present invention is to provide a lifting electromagnet for high-temperature steel, which does not generate a pyrolysis gas and has excellent heat resistance, in order to solve the above-mentioned problems (problems) of the prior art and the prior art. And

[0010]

According to the present invention, as means for preventing generation of pyrolysis gas, a yoke, outer and inner magnetic poles, an exciting coil, and a bottom plate for holding the coil are provided. In the lifting electromagnet for high temperature steel provided with the above, an inorganic insulated wire was used as a coil of the lifting electromagnet.

Further, the same effect can be obtained by impregnating the coil of the lifting electromagnet for high temperature steel with a varnish of an inorganic resin to solidify the coil.

In the above-described lifting electromagnet, by using a copper-based composite conductor as the conductor of the coil wire, the heat resistance of the lifting electromagnet of the present invention is further improved, and the strength of the coil is also increased.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of each embodiment of a lifting electromagnet of the present invention will be described with reference to FIG. The basic configuration of the lifting electromagnet 8 of the present invention is as shown in FIG.
The magnetic poles (outer pole 2, inner pole 3), yoke 4, compound 5 and bottom plate 6 are arranged and arranged in the same manner as the conventional one shown in FIG. However, as the electric wire of the coil 1, there is also a configuration in which a Nomex tape wound aluminum conductor wire is used as in the case of the conventional lifting electromagnet. However, in the case of the aluminum conductor wire, there is a problem in strength and heat resistance. It is desirable to use a copper-based composite conductor having high strength and heat resistance, such as copper, nickel-clad copper, and stainless-clad copper.

Further, the following three embodiments can be considered as a method of insulating the coil 1. First Embodiment: That is, the first embodiment of the lifting electromagnet 8 of the present invention is characterized in that an inorganic insulated wire is used as the coil 1 in the above configuration. Coil 1
As an insulating layer of an electric wire for use, a resin comprising one or more selected from polyborosiloxane, polycarbosilane, polysilastyrene, polysilazane, polytitanocarbosilane and organosiloxane, and an inorganic filler It is appropriate to use a glass tape or a glass fiber impregnated with a ceramic insulation in which is dissolved or dispersed in a solvent.

Second Embodiment: In a second embodiment of the lifting electromagnet 8 of the present invention, as the compound 5 of the coil 1 of the lifting electromagnet 8, a varnish of inorganic resin (inorganic varnish) is used only on the outer periphery of the coil. Instead, it impregnates the gaps between the internal coils to solidify the coils.
As a specific example of the inorganic varnish, a varnish in which one or more oxides of oxide ceramics such as magnesium oxide, alumina, zirconium oxide, calcium oxide, boron oxide, silica, mica, and talc are mixed is appropriate. It is. The heat resistance of the inorganic insulating materials of these electric wires and varnishes is 400 ° C. or higher, respectively.

Third Embodiment: As a third embodiment of the present invention, the above first and second embodiments are combined, an inorganic insulated wire is used as a coil, and an inorganic varnish is impregnated as a compound material. It is conceivable to solidify the coil.

[0017]

As described above, the lifting electromagnet of the present invention has the following excellent effects. (1) When the lifting electromagnet of the present invention is configured to use an inorganic insulated wire as a coil as described in claim 1, the compound is overheated by the heat of the high-temperature steel material at 500 to 600 ° C, and pyrolysis gas is generated from the wire. And the heat resistance of the lifting electromagnet is improved.
Further, since a heat-resistant inorganic material is used for the insulating material of the electric wire of the coil, the heat resistance for a long time is improved by 100 ° C. or more, so that the electric current of the electric wire can be increased. Therefore, even if the total number of turns is reduced, the attraction force does not decrease by flowing more current. That is, by reducing the number of turns of the electric wire, the lifting electromagnet itself can be further reduced in size and thickness, and it is not necessary to attach a cooling device or the like. (2) Since the lifting electromagnet of the present invention has a configuration in which an inorganic resin varnish is used for the coil as described in claim 2, there is no concern that pyrolysis gas is generated from the compound, and the lifting electromagnet is eliminated. Has improved heat resistance. (3) Further, as in claim 3, by adding the constituent features of claim 1 and claim 2, the heat resistance of the lifting electromagnet is further improved. (4) As described above, by using an inorganic insulating material for the insulating material of the lifting electromagnet, the long-term heat resistance of the compound becomes 300 ° C. or higher, and the heat transfer coefficient of the inorganic insulating material is higher than that of the organic insulating material. Since the heat dissipation from the high-temperature steel material is good, the size and thickness can be reduced as compared with the conventional lifting electromagnet. (5) By using a copper-based composite conductor as the conductor of the coil electric wire, the heat resistance of the lifting electromagnet and the strength of the coil are further increased.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view showing an embodiment of a lifting electromagnet of the present invention.

FIG. 2 is a perspective view showing a configuration of a conventional lifting electromagnet.

[Explanation of symbols]

 1: Coil 2: Outer pole 3: Inner pole 4: Yoke 5: Compound 6: Bottom plate 7: High-temperature steel (billet) 8: Lifting electromagnet of the present invention

Claims (4)

[Claims] 1. A lifting electromagnet for a high-temperature steel material comprising a yoke, magnetic poles of an outer pole and an inner pole, a coil for excitation, and a bottom plate for holding the coil, wherein an inorganic insulated wire is used as a coil of the lifting electromagnet. A lifting electromagnet for high-temperature steel, characterized by using a. 2. A lifting electromagnet for a high-temperature steel material comprising a yoke, magnetic poles of an outer pole and an inner pole, a coil for excitation, and a bottom plate for holding the coil, wherein the coil of the lifting electromagnet is inorganic. A lifting electromagnet for high-temperature steel, wherein a coil is solidified by impregnating with a varnish of a base resin. 3. The lifting electromagnet according to claim 1, wherein the coil is impregnated with a varnish of an inorganic resin to solidify the coil. 4. The lifting electromagnet for high temperature steel according to claim 1, wherein a copper-based composite copper body is used as a conductor of a coil of the lifting electromagnet.