JP7381885B2 - Electrode device and cylindrical metal coil heating device - Google Patents

Description

The present invention relates to an electrode device and a heating device for a cylindrical metal coil.

As a method for efficiently and uniformly heat-treating a cylindrical metal coil in a short time, Patent Document 1 and Patent Document 2 disclose a method of penetrating the inside of a cylindrical metal coil in which metal strips are wound so that the plates are insulated. An iron core and an iron core around which a primary induction coil (hereinafter also referred to as a primary coil) is wound are connected outside the cylindrical metal coil to form a ring-shaped transformer, and the cylindrical metal coil is connected to the secondary side of the transformer. A technique is described in which an induction coil (hereinafter also referred to as a secondary coil) is used, and a secondary closed circuit is constructed by short-circuiting a metal strip at the outermost circumference and a metal strip at the innermost circumference with a conductive member. has been done. In this case, by applying a voltage to the primary coil, a secondary current flows through the cylindrical metal coil to heat it.

Japanese Patent Application Publication No. 2000-119740 Japanese Patent Application Publication No. 11-236626

In Patent Document 1 and Patent Document 2, it is not explained how the conductive member is attached to the metal strips at the outermost and innermost peripheries of the cylindrical metal coil. In the drawings of each document, the metal strips at the outermost and innermost peripheries are drawn out and connected to the electrodes. However, in the case of a thick plate or a hard metal strip such as a high-strength steel plate, it is difficult to separate the outermost and innermost metal strips from the cylindrical metal coil and pull them out. Furthermore, it was not easy to perform processing such as drilling holes in the pulled out metal strip to connect the electrodes.

Therefore, the present invention provides an electrode device that can easily and reliably connect shorting means to the inner and outer circumferential sides of a cylindrical metal coil in a short time, and a heating device for a cylindrical metal coil that includes the electrode device. The purpose is to provide.

[1] A first electrode capable of contacting the inner peripheral surface of a cylindrical metal coil in which a metal band plate is wound in a cylindrical shape, a second electrode capable of contacting the outer peripheral surface of the cylindrical metal coil, and a second electrode capable of contacting the outer peripheral surface of the cylindrical metal coil. An electrode device comprising: a conductive member that electrically connects a first electrode and a second electrode; and a pressing means that applies a pressing force in a direction that brings the first electrode and the second electrode closer to each other.
[2] The electrode according to [1], further comprising a frame to which the first electrode is fixed and the second electrode is slidably attached, and the pressing means applies a pressing force to the frame by taking a reaction force. Device.
[3] The conductive member is connected to the first electrode and extends along the frame, and is movable along the installed conductor rod and can come into contact with the installed conductor rod, and is connected to the second electrode. The electrode device according to [2], comprising a contact member.
[4] The electrode device according to [1], wherein the pressing means applies a pressing force to the first electrode by applying a reaction force to the iron core passing through the center of the cylindrical metal coil.
[5] The electrode device according to [4], wherein the second electrode is a skid on which a cylindrical metal coil is placed.
[6] A ring-shaped transformer including an iron core passing through the center of a cylindrical metal coil, a primary induction coil wound around the ring-shaped transformer, and a primary power source connected to the primary induction coil, [1] A heating device for a cylindrical metal coil, comprising the electrode device according to any one of [5].

According to the above configuration, the shorting means can be easily and reliably connected to the inner circumferential side and the outer circumferential side of the cylindrical metal coil in a short time.

1 is a diagram schematically showing the configuration of a heating device for a cylindrical metal coil according to a first embodiment of the present invention. FIG. 2 is a partial cross-sectional view of the heating device shown in FIG. 1 taken along line II-II. FIG. 2 is a partial cross-sectional view of the heating device shown in FIG. 1 taken along line II-II. FIG. 2 is a cross-sectional view of the heating device shown in FIG. 1 taken along line III-III. FIG. 2 is a diagram showing an example of a conductive member length adjustment device incorporated into an electrode device that can be used in the example of FIG. (b) is a view of the conductive member length adjusting device seen from the side of (a), and (c) is a diagram illustrating a state in which the conductive member length adjusting device is operated. FIG. 3 is a cross-sectional view showing the configuration of a heating device for a cylindrical metal coil according to a second embodiment of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Note that, in this specification and the drawings, components having substantially the same functional configurations are designated by the same reference numerals and redundant explanation will be omitted.

(First embodiment)
FIG. 1 is a diagram schematically showing the configuration of a heating device for a cylindrical metal coil according to a first embodiment of the present invention. The heating device includes an iron core 2 that passes through the center of a cylindrical metal coil 1 in which a metal strip is wound into a cylindrical shape, a U-shaped iron core 3 that is detachably connected to both ends of the iron core 2, and an iron core 3 that is detachably connected to both ends of the iron core 2. The primary coil 4 is wound around the primary coil 4 and the electrode device 5 is included. The iron cores 2 and 3 are made of a good magnetic material such as an electromagnetic steel plate. As will be described later, the electrode device 5 holds the cylindrical metal coil 1 between a pair of electrodes that contact the inner circumferential surface and the outer circumferential surface of the cylindrical metal coil 1, respectively, and thereby winds the cylindrical metal coil 1. The starting end and the ending end of the metal strip are short-circuited. Here, between each layer of the metal strip wound around the cylindrical metal coil 1, there is an insulator inserted between the layers during winding, an insulating coating formed on the surface of each layer, or a hot rolling process in the previous process. is substantially insulated by the scale formed on the surface of the metal strip.

In the above-mentioned heating device, when a primary voltage is applied using the primary power source 6 connected to the primary coil 4, a secondary voltage is generated according to the number of turns of the primary coil by the action of the iron cores 2 and 3 that constitute the ring-shaped transformer. A voltage is induced in the cylindrical metal coil 1. As described above, since each layer of the metal strip wound around the cylindrical metal coil 1 is substantially insulated, the cylindrical metal coil 1 constitutes a secondary coil wound around the iron core 2. Joule heat is generated when a secondary current flows through a secondary circuit constituted by each layer of the metal strip and the electrode device 5. If the frequency of the primary power source 6 is set relatively low, a substantially uniform current flows in the width direction of the metal strip wound around the cylindrical metal coil 1, so that the cylindrical metal coil 1 is uniformly heated by Joules. can do.

2A and 2B are partial sectional views of the heating device shown in FIG. 1 taken along the line II-II, and FIG. 3 is a sectional view of the heating device shown in FIG. 1 taken along the line III-III. As illustrated, the electrode device 5 includes electrodes 51 and 52, a frame 53, an air cylinder 54, and a cable 55. The electrode 51 contacts the inner peripheral surface 1S of the cylindrical metal coil 1, and the electrode 52 contacts the outer peripheral surface 1E of the cylindrical metal coil 1. The contact surfaces of the electrodes 51 and 52 may be cylindrical surfaces that match the shape of the cylindrical metal coil. Specifically, the contact surface of the electrode 51 may be a convex cylindrical surface, and the contact surface of the electrode 52 may be a concave cylindrical surface. Frame 53 supports each of electrodes 51 and 52. In the illustrated example, electrode 51 is fixed to frame 53 and electrode 52 is slidably mounted along frame 53. The air cylinder 54 takes a reaction force to the frame 53 and applies a pressing force in a direction to move the electrode 52 closer to the electrode 51. Cable 55 is electrically connected to electrodes 51 and 52, respectively. Since the cable 55 becomes hot due to the flow of the secondary current, a cable incorporating a cooling means such as a water-cooled cable may be used, for example.

When attaching the electrode device 5 to the cylindrical metal coil 1, first remove resistance such as scale on the surface layer using a polishing device such as a grinder on the inner circumferential surface 1S and outer circumferential surface 1E of the metal strip where the electrodes 51 and 52 come into contact. It is necessary to remove the layer or insulating layer to expose the highly conductive metal surface. The work of exposing the metal surface of the cylindrical metal coil 1 may be performed manually using a grinder as described above, or may be performed automatically using a polishing machine or the like, and any means may be used. Thereafter, as shown in FIGS. 2A and 3, the distance between the electrodes 51 and 52 is made larger than the winding thickness of the cylindrical metal coil 1, and a U-shape or U-shape formed by the electrodes 51 and 52 and the frame 53 is formed. The electrode device 5 is arranged so that the end face of the cylindrical metal coil 1 is placed inside the shape. For example, a moving cart 56 as shown in FIG. 3 may be used to move the electrode device 5. At this time, the electrode 51 faces the inner peripheral surface 1S of the cylindrical metal coil 1, the electrode 52 faces the outer peripheral surface 1E of the cylindrical metal coil 1, and the frame 53 extends in the radial direction of the cylindrical metal coil 1. Next, as shown in FIG. 2B, by pressing the electrode 52 toward the electrode 51 using the air cylinder 54, the electrode 52 and the electrode 51 are moved to the inner peripheral surface 1S and the outer peripheral surface 1E of the cylindrical metal coil 1, respectively. contact with. The examples in FIGS. 1 to 3 show the case where the electrode device is placed only on one side of the cylindrical metal coil 1 in the width direction, but it may be placed on both sides in the width direction, and the electrode device can be sandwiched at more than one point. It doesn't matter if there are multiple parts.

With the above configuration, in this embodiment, the shorting means consisting of the electrodes 51, 52 and the cable 55 can be easily and reliably connected to the inner circumferential surface 1S and outer circumferential surface 1E of the cylindrical metal coil 1. By holding the cylindrical metal coil 1 between the electrodes 51 and 52 that contact the inner circumferential surface 1S and outer circumferential surface 1E of the cylindrical metal coil 1, respectively, a short circuit can be easily made to the cylindrical metal coil 1 without pulling out the metal strip. Means can be connected. In addition, by applying a pressing force between the electrodes 51 and 52 using the air cylinder 54, it is possible to securely connect the electrodes without drilling or other processing in the metal strip, which is required when fastening the electrodes with bolts or the like. Shorting means can be connected to the cylindrical metal coil 1. The electrode device 5 according to this embodiment is more advantageously used for the cylindrical metal coil 1 wound with a hard metal strip made of stainless steel or high-strength steel, for example. is not limited.

Note that, as described above, the secondary current induced by the primary power source 6 and the primary coil flows in a diffused manner in the width direction of the metal strip wound around the cylindrical metal coil 1, so the electrodes 51 and 52 The contact may be made in the vicinity of the end face of the metal coil 1, that is, in the vicinity of the widthwise end of the metal strip. Furthermore, although each layer of the metal strip wound around the cylindrical metal coil 1 is electrically insulated, heat is transferred between the layers, so the inner circumferential surface 1S and outer circumferential surface 1E with which the electrodes 51 and 52 come into contact are not necessarily It does not have to coincide with the starting and ending ends of the metal strip.

In the above example, the air cylinder 54 is used as a pressing means for applying a pressing force in a direction that brings the electrodes 51 and 52 closer to each other, but in other examples, a spring or the like may be used to apply the pressing force. The pressing force may be applied by a bolt that is screwed into a screw hole formed in the frame 53 and tightened toward the electrode 52. Further, in the above example, the air cylinder 54 was used to press the electrode 52 toward the electrode 51, but the air cylinder or other pressing means may be used to press the electrode 51 toward the electrode 52.

FIGS. 4(a) to 4(c) are diagrams illustrating an example of a conductive member length adjusting device incorporated into an electrode device that can be used in the example of FIG. In the electrode device 5 described above, the electrode 52 is slidably attached along the frame 53, and the distance between the electrodes 51 and 52 is variable, so that the electrode device 5 can be attached to the cylindrical metal coil 1. Furthermore, the same electrode device 5 can be used as short-circuiting means for cylindrical metal coils 1 having different winding thicknesses. However, in this case, as a result of the length of the cable 55 being a conductive member corresponding to the maximum distance between the electrodes 51 and 52, when the distance between the electrodes 51 and 52 is reduced by the pressure by the air cylinder 54, The excessive length of the cable 55 may cause problems such as sparks due to unnecessary contact with the cylindrical metal coil 1, or the unnecessary length may increase the impedance and reduce the efficiency of Joule heating. There is sex.

Therefore, for example, a conductive member length adjusting device as shown in FIG. 4 may be incorporated into the electrode device 5. In the example shown in FIG. 4, the conductive members include a cable 55A connected to the electrode 51, an installed conductor rod 55B connected to the electrode 51 via the cable 55A and extending along the frame 53, and an installed conductor rod 55B. and a contact member 55C that is movable along the conductor rod 55C and that is capable of contacting the installed conductor rod 55B and connected to the electrode 52. The contact member 55C is configured to be able to be pressed against the installed conductor rod 55B using, for example, a spring or a screw. By pressing the contact member 55C against the construction conductor bar 55B, the contact member 55C is fixed in contact with the construction conductor bar 55B, and the connection between the electrodes 51 and 52 is made through the cable 55A, the construction conductor bar 55B, and the contact member 55C. conduction. While the contact member 55C is not pressed against the installed conductor bar 55B, the contact member 55C becomes movable together with the electrode 52.

As shown in FIG. 4(a), an opening 53A extending in the longitudinal direction is formed in the frame 53, and the installation conductor rod 55B is installed above the opening 53A and across the opening 53A in the longitudinal direction. . The contact member 55C is connected to the electrode 52 attached to the opposite side of the frame 53 through the opening 53A. The construction conductor rod 55B is fixed to the frame 53 via a support member 53B on the opposite side from the cable 55A. In order to move the contact member 55C along the construction conductor rod 55B, a screw shaft 61, a nut 62, and screw shaft fixing parts 63, 64 that constitute a ball screw, and a connecting member 65 that connects the nut 62 to the contact member 55C. A moving support mechanism is provided that includes. The moving support mechanism may be common to the pressing means, such as the air cylinder 54 described above, or may be provided separately from the pressing means.

As shown in FIGS. 4(b) and 4(c), by moving the contact member 55C along with the electrode 52 along the installed conductor bar 55B and pressing the contact member 55C against the installed conductor rod 55B at the moving destination, The conductive portion of the conductive member can be made to have a minimum length depending on the distance between the electrodes 51 and 52, that is, the winding thickness of the cylindrical metal coil 1. 4(b) shows the distance d1 between the electrodes 51 and 52 corresponding to the minimum winding thickness of the cylindrical metal coil 1, and FIG. 4(b) shows the distance d1 corresponding to the maximum winding thickness of the cylindrical metal coil 1. The distance d2 between the turns of the electrodes 51 and 52 is shown, but in each example, the length of the conductive portion of the conductive member is approximately the same as the lengths d1 and d2. This can prevent the Joule heating efficiency from decreasing due to an increase in impedance due to an unnecessary length. Furthermore, in the above example, the length of the conductive portion of the conductive member is adjusted using the installed conductor rod 55B, and the remaining portion of the installed conductor rod 55B is fixed to the frame 53 via the support member 53B. , unnecessary troubles such as excess conductive material contacting the cylindrical metal coil and causing sparks can be avoided.

(Second embodiment)
FIG. 5 is a sectional view showing the configuration of a heating device for a cylindrical metal coil according to a second embodiment of the present invention. FIG. 5 is a sectional view taken in the same direction as FIG. 2, and the configuration of the heating device according to this embodiment is the same as that of the first embodiment except for the configuration shown in FIG. In this embodiment, the heating device includes electrodes 51 and 52, an air cylinder 54, a cable 55, and an insulator 57. In this embodiment, the air cylinder 54 exerts a reaction force on the iron core 2 passing through the center of the cylindrical metal coil 1, and applies a pressing force in a direction to move the electrode 51 closer to the electrode 52. The insulator 57 is interposed between the air cylinder 54 and the electrode 51, transmits the pressing force of the air cylinder 54 to the electrode 51, and insulates between the electrode 51 and the iron core 2. In another example, an insulator may be interposed between the air cylinder 54 and the iron core 2.

In this embodiment, since the air cylinder 54 is arranged inside the cylindrical metal coil 1, the cylindrical metal coil 1 is placed on the skid 7, and the electrode 52 is sandwiched between the cylindrical metal coil 1 and the skid 7. can be placed. Alternatively, the skid 7 may be used as an electrode that contacts the outer peripheral surface 1E of the cylindrical metal coil 1. In this case, the cable 55 is electrically connected to the electrode 51 and the skid 7, respectively. Also in this embodiment, other pressing means such as a spring or a bolt may be used instead of the air cylinder 54. Furthermore, the conductive member and electrode for short circuiting may be provided with a cooling mechanism such as a water cooling device, if necessary.
In addition, although the above embodiment describes the case where a transformer is used, the present invention is also applicable to the case where electrodes are attached to the starting end and the ending end of a cylindrical metal coil and heating is performed directly by energization without using a transformer. It is.

Although preferred embodiments of the present invention have been described above in detail with reference to the accompanying drawings, the present invention is not limited to such examples. It is clear that a person with ordinary knowledge in the technical field to which the present invention pertains can come up with various changes or modifications within the scope of the technical idea described in the claims. It is understood that these also fall within the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1... Cylindrical metal coil, 1E... Outer circumferential surface, 1S... Inner circumferential surface, 2, 3... Iron core, 4... Primary coil (primary side induction coil), 5... Electrode device, 6... Primary power supply, 7... Skid, 51 , 52... Electrode, 53... Frame, 54... Air cylinder, 55... Cable (conductive member), 55A... Cable, 55B... Erection conductor bar, 55C... Contact member, 56... Moving trolley, 57... Insulator.

Claims (5)

a first electrode capable of contacting the inner peripheral surface of a cylindrical metal coil in which a metal band plate is wound in a cylindrical shape;
a second electrode capable of contacting the outer peripheral surface of the cylindrical metal coil;
a conductive member that electrically connects the first electrode and the second electrode;
pressing means for applying a pressing force in a direction to bring the first electrode and the second electrode closer to each other ;
a frame to which the first electrode is fixed and the second electrode is slidably attached;
Equipped with
In the electrode device, the pressing means applies the pressing force to the frame by taking a reaction force . The conductive member is
an installed conductor rod connected to the first electrode and extending along the frame;
The electrode device according to claim 1 , further comprising: a contact member that is movable along the installed conductor rod, can come into contact with the installed conductor rod, and is connected to the second electrode. a first electrode capable of contacting the inner peripheral surface of a cylindrical metal coil in which a metal band plate is wound in a cylindrical shape;
a second electrode capable of contacting the outer peripheral surface of the cylindrical metal coil;
a conductive member that electrically connects the first electrode and the second electrode;
a pressing means for applying a pressing force in a direction to bring the first electrode and the second electrode closer to each other;
The pressing means applies the pressing force to the first electrode by applying a reaction force to an iron core passing through the center of the cylindrical metal coil. The electrode device according to claim 3 , wherein the second electrode is a skid on which the cylindrical metal coil is placed. a ring-shaped transformer including an iron core passing through the center of the cylindrical metal coil;
a primary induction coil wound around the ring-shaped transformer;
a primary power source connected to the primary induction coil;
A heating device for a cylindrical metal coil, comprising: the electrode device according to any one of claims 1 to 4 ;

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