JPH04581B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is used for induction electrical equipment such as transformers,
The present invention relates to an annealing apparatus suitable for annealing a wound core made of an amorphous alloy in a magnetic field.

[Prior Art] Recently, amorphous alloys have been attracting attention as magnetic materials, and the use of these amorphous alloys in transformer cores is being considered. The amorphous alloy used for the iron core has the advantage of extremely low iron loss, but it is annealed at 400°C.
It must be carried out in an inert gas at a nearby temperature with a magnetic field applied. Conventionally, when annealing a wound core in a magnetic field, an excitation coil is wound around each of a plurality of wound cores, and then the wound core is carried into an annealing furnace together with the excitation coil, and the inside of the furnace is evacuated. After the temperature was reduced, the furnace was filled with inert gas and annealed at a predetermined temperature.

[Problems to be Solved by the Invention] As described above, in the conventional annealing method, it was necessary to wind the excitation winding for each core and unwind the winding after annealing. There were problems in that it was extremely troublesome, had low work efficiency, and was poor in mass production.

Therefore, as previously disclosed in Japanese Patent Application No. 59-120690 (Japanese Unexamined Patent Publication No. 64-521), the applicant has proposed that an excitation electrode be passed through the window of the wound core, and that the excitation electrode be connected to the excitation power source. We proposed a technology to excite the wound core by passing current through the electrodes. In the specifically disclosed annealing apparatus, one excitation electrode is provided to slidably penetrate the wall of the annealing furnace, and this excitation electrode is inserted into the window of the wound core to excite the wound core. is going on. The excitation electrode is energized by bringing a contact type electrode placed outside the annealing furnace into contact with the excitation electrode. Therefore, in a structure in which one excitation electrode is inserted into the window of the wound core, the excitation electrode becomes long, which requires space to store and hold the long excitation electrode, resulting in an increase in the size of the device. It was hot. Also, since it is necessary to pull out at least the tip of the excitation electrode from the wall of the annealing furnace, a structure is required to pull out the excitation electrode so as to prevent the inert gas filled in the annealing furnace from leaking. There was a problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide a continuous annealing device for a wound core, which eliminates the trouble of winding a wound core for forming a magnetic field around the wound core and efficiently annealing the wound core in a magnetic field.

[Means for Solving the Problems] The wound iron core magnetic field annealing apparatus of the present invention includes an annealing furnace,
a conveying device comprising a plurality of trays arranged along the longitudinal direction of an annealing furnace, holding a wound core to be annealed on each tray and transporting each wound core in the longitudinal direction of the furnace within the annealing furnace; an excitation conductor that is provided so as to pass through a window of the wound core held in the tray and supported by the tray; a forward position in which the excitation conductor is in contact with the excitation conductor in the annealing furnace; and a retracted position in which the excitation conductor is separated from the excitation conductor. first and second excitation movable electrodes supported with respect to the annealing furnace so as to be able to be displaced between them; and an excitation power source that supplies current to the excitation conductor through the first and second excitation movable electrodes. We are prepared.

[Operation of the invention] When annealing in a magnetic field is performed using the above-mentioned apparatus, the wound core is intermittently conveyed by the conveying device, and while the wound iron core is stopped, the first and second excitation movable electrodes are advance to make contact with the excitation conductor. In this state, the excitation power source energizes the excitation conductor through the first and second excitation movable electrodes to apply a magnetic field to the wound core. In this way, a magnetic field can be applied in the annealing furnace without winding an excitation coil around each wound core, so that troublesome work can be omitted and the wound core can be efficiently annealed in a magnetic field.

In particular, in the present invention, the excitation conductor is provided so as to penetrate through the window portion of the wound core, and the first and second movable excitation electrodes are brought into contact with the excitation conductor to perform excitation. Compared to the case where the excitation electrodes are inserted into the window portion of the wound core, the space required to house and hold the first and second movable excitation electrodes is smaller, and the device can be made more compact. Also the first
Also, since it is not necessary to pull out the second excitation movable electrode from the wall of the annealing furnace, there is an advantage that a complicated structure for preventing leakage of inert gas is not required.

[Example] Hereinafter, an example of the annealing apparatus according to the present invention will be described in detail based on the drawings.

The drawing is a horizontal cross section of a continuous annealing apparatus according to the present invention, and 1 is an annealing furnace in which a front chamber 2, a heating chamber 3, and a rear chamber 4 are connected. Each chamber 2, 3, 4 of annealing furnace 1
A partition door 5 that can be opened and closed is provided at the boundary between the front chamber 2 and the rear chamber 4, respectively.
A is provided so that it can be closed airtight. Further, in the lower part of the annealing furnace 1, two rows of roller chain conveyors 6, for example, extending from the front of the loading port 2a to the rear of the loading port 4a are provided in parallel with an interval in the width direction of the annealing furnace 1. There is. A gas supply pipe (not shown) for supplying an inert gas is provided in the heating chamber 3, and heating means such as a heater (not shown) is provided to raise the temperature in the heating chamber 3 to an annealing temperature of about 350 to 400°C. is provided. A plurality of trays 7 are arranged on the roller chain conveyor 6 at intervals in the longitudinal direction of the furnace, and the roller chain conveyor 6 and the trays 7 constitute a wound core conveying device. A wound core 8 is placed on each tray 7 with the winding axis oriented horizontally (with the winding axis perpendicular to the longitudinal direction of the furnace), and each wound core 8 is supported with respect to the tray 7 by a support (not shown). has been done.

An excitation conductor 15 is arranged to penetrate the core window of each winding core 8 placed on each tray 7 of the conveying device, and this excitation conductor 15 is arranged perpendicularly to the longitudinal direction of the annealing furnace 1 and between the windings. They are electrically insulated and supported by the tray 7 in a state where they are positioned so that their protruding dimensions from the iron core 8 are equal.

A plurality of first and second excitation movable electrodes 9a and 9b are provided on both sides of the transport device so that they can be moved forward and backward.

A plurality of first excitation movable electrodes 9a, 9a,...
are arranged at equal intervals in the longitudinal direction of the annealing furnace 1, and are slidably and airtightly penetrated through the side wall 1a of the heating chamber of the furnace and supported with respect to the furnace.
Each first excitation movable electrode 9a is displaced between a forward position where it approaches the conveyance device and contacts one end of the excitation conductor 15, and a retreated position where it is separated from the conveyance device and away from the excitation conductor 15. .

The spacing between the plurality of first excitation movable electrodes 9a, 9a, . . . is set equal to the spacing between the excitation conductors 15, 15, which are respectively supported by a series of trays present in the heating chamber. .

The second excitation movable electrodes 9b are provided in the same number as the first excitation movable electrodes 9a, 9a, . . . and are arranged so as to face the first excitation movable electrodes 9a, 9a, . It is slidably and airtightly penetrated through the side wall 1b of the heating chamber of the furnace 1 and is supported with respect to the furnace. Each second excitation movable electrode 9b is displaced between a forward position where it approaches the transport device and contacts the other end of the excitation conductor 15, and a retreat position where it is separated from the transport device and away from the excitation conductor 15. .

It goes without saying that the first and second excitation movable electrodes 9a, 9b are electrically insulated from the side wall of the furnace.

A plurality of first excitation movable electrodes 9a, 9a,...
are commonly connected by a connecting member 10 made of an insulator. The connecting member 10 is connected to a hydraulic or pneumatic cylinder 11, whereby the first excitation movable electrodes 9a, 9a, . . . collectively contact one end of the corresponding excitation conductor 15, 15, . It is designed to be driven forward and backward between a forward position and a backward position where it is separated from the conveyance device and away from these excitation conductors.

Similarly, a plurality of second excitation movable electrodes 9b,
9b, . . . are also commonly connected by a connecting member 10 made of an insulator. The connecting member 10 is connected to a cylinder 12, which causes the second excitation movable electrodes 9b, 9b, . The excitation conductor 1 is placed in the forward position and separated from the transport device.
5, 15, .

13 is a DC or AC excitation power source for supplying current to the excitation conductor 15 through the excitation movable electrodes 9a and 9b, and 14 is a switch. Among the four first excitation movable electrodes 9a, 9a,..., the front chamber 2 of the furnace
The two excitation movable electrodes 9a, 9a which are adjacent to each other on the side closer to the rear chamber 4 are connected by a lead wire _l1 ,
a is connected by lead wire _l2 . Also the second
Among the excitation electrodes 9b, 9b, _.
The excitation movable electrode 9b near one end of the heating chamber 3 of the furnace 1 is connected to the excitation power source 13 by a lead wire _l4 .
is connected to one output terminal of the Also, a movable excitation electrode 9 placed near the other end of the heating chamber 3 of the furnace
b is connected to one end of the switch 14 by a lead wire _l5 , and the other end of the switch 14 is connected to the other output terminal of the excitation power source 13 by a lead wire _l6 .

Each tray 7 is intermittently conveyed by the roller chain conveyor 6 while maintaining a predetermined interval corresponding to the interval between the first and second excitation movable electrodes 9a, 9a, . . . and 9b, 9b, . It's getting old,
The drive of the roller chain conveyor 6 is stopped for a predetermined time at the position where both ends of the excitation conductor 15 correspond to the first and second movable excitation electrodes 9a and 9b, and the conveyance of the tray 7 is temporarily stopped. It's summery.

Further, when the conveyance of the tray 7 is stopped, the first and second excitation movable electrodes 9a and 9b are driven by the cylinders 11 and 12 to the forward position, and in this state, the first and second excitation movable electrodes 9a and 9b are driven to the forward position. The electrodes 9a and 9b abut on one end and the other end of the corresponding excitation conductor 15, respectively, and are electrically connected.

Next, the continuous annealing operation by the above-mentioned annealing apparatus will be explained.

The drawing shows a state in which wound cores 8 placed on trays 7 are continuously juxtaposed on a roller chain conveyor 6 and annealed in a magnetic field. The inside of the heating chamber 3 is heated to a predetermined annealing temperature by a heating means (not shown), and the inside of the heating chamber 3 is filled with an inert gas. Furthermore, the switch 14 is closed,
The movable excitation electrodes 9a and 9 are powered by the excitation power source 13.
The excitation conductor 15 is energized through b, and the heating chamber 3
A magnetic field of a predetermined strength is applied to each winding core 8 within.

When the energization time to the excitation conductor 15 reaches a predetermined time, the switch 14 is opened to cut off the energization to each excitation conductor 15, and the cylinders 11, 12
are simultaneously driven to retreat in the direction of the arrow.
As a result, the excitation movable electrodes 9a, 9a, ... and 9
b, 9b, . . . are collectively retracted to the retracted position, and the tips of the excitation movable electrodes are separated from the excitation conductor 15. This excitation movable electrode 9
Retraction of a and 9b is detected by limit switches (not shown) set in cylinders 11 and 12. Based on the detection signal from this limit switch, the partition door 5 and the roller chain conveyor 6 are
is driven. That is, first, the partition door 5 of the export exit 4a
After being pulled upward, the roller chain conveyor 6 in and behind the rear chamber 4 is driven, and the rolled iron core 8 in the rear chamber 4 is carried out from the annealing furnace 1. Thereafter, the partition door 5 is driven and pulled down, and the roller chain conveyor 6 is stopped. Subsequently, after the partition doors 5, 5 provided at the boundaries between the heating chamber 3, the front chamber 2, and the rear chamber 4 are pulled up, the roller chain conveyors in the front chamber 2, the heating chamber 3, and the rear chamber 4 are removed. 6 is driven. As a result, the wound core 8 located in the front chamber 2 is moved to the heating chamber 3.
Inside, the wound cores 8 located at the front of the rear chamber 4 are transported into the rear chamber 4. When the wound core 8 is conveyed, the drive of the roller chain conveyor 6 is stopped, the partition doors 5, 5 which had been pulled up are pulled down, and the heating chamber 3 is hermetically closed again. Subsequently, the cylinders 11 and 12 are driven, and the excitation movable electrodes 9a and 9b advance to the forward position within the heating chamber 3 and come into contact with both ends of the excitation conductor 15, respectively. Thereafter, the switch 14 is closed, the excitation conductor 15 is energized, and each wound core 8 in the heating chamber 3 is excited. After that, after being energized for a predetermined period of time, the energization is stopped and the excitation movable electrodes 9a and 9b are moved back again.Then, the partition door 5 of the entrance 2a is pulled upward and placed in front of the front chamber 2. One wound core 8 is transported into the front chamber 2. When the conveyance of the wound core 8 is completed, the roller chain conveyor 6 is stopped, the partition door 5 is pulled down, and the front chamber 2 is sealed. Thereafter, the same operation as described above is repeated, and the wound cores 8 that have been annealed in the magnetic field are successively taken out one by one at predetermined time intervals from the outlet 4a. The annealed wound core 8 is then moved along the excitation conductor 15 and removed from the end of the conductor.

In the apparatus of the above embodiment, since the excitation movable electrodes 9a and 9b are brought into contact with both ends of the excitation conductor 15 supported on the tray 7 and energized, the excitation conductor 15 is energized even in the high temperature atmosphere in the heating chamber 3. It can conduct electricity well, and there is no risk of poor contact. Furthermore, since the excitation movable electrodes 9a and 9b are not removed from the annealing furnace 1, leakage of the inert gas filled in the heating chamber 3 can be prevented by using a heat-resistant slide bearing with a seal in the part that penetrates the furnace wall.

In this embodiment, a roller chain conveyor system that can partially drive the conveyance of trays in the furnace is used, but it goes without saying that other conveyance means such as drive rollers, walking beams, tray pusher systems, etc. may be used.

[Effects of the Invention] As described above, according to the present invention, it is possible to apply a magnetic field in an annealing furnace without winding an excitation coil around each wound core, thereby eliminating troublesome work and annealing the wound core in a magnetic field. can be done efficiently.

In particular, according to the present invention, the excitation conductor passing through the window of the wound core is supported on the tray, and the first and second movable excitation electrodes are supported so as to be freely displaceable with respect to the furnace. Because excitation is performed by bringing the excitation movable electrode forward to the forward position and bringing it into contact with the excitation conductor, compared to the case where one excitation electrode is inserted into the window of the wound core, the first and second The space required to house and hold the excitation movable electrode is small, and the device can be made smaller. Furthermore, since it is not necessary to pull out the first and second excitation movable electrodes from the wall of the annealing furnace, there is an advantage that a complicated structure for preventing leakage of inert gas is not required.

[Brief explanation of drawings]

The drawing is a horizontal cross-sectional plan view of a wound core annealing apparatus according to the present invention. 1... Annealing furnace, 2... Front chamber, 3... Heating chamber, 4
... Rear chamber, 5 ... Partition door, 6 ... Roller chain conveyor, 7 ... Tray, 8 ... Winding core, 9a,
9b...Movable excitation electrode, 11, 12...Cylinder, 15...Excitation conductor.

Claims (1)

[Claims] 1 An annealing furnace, comprising a plurality of trays arranged along the longitudinal direction of the annealing furnace, holding the wound core to be annealed on each tray and transporting each wound core in the longitudinal direction of the furnace within the annealing furnace. an excitation conductor provided so as to pass through the window of the wound core held in each of the trays and supported by the tray;
first and second movable excitations supported relative to the annealing furnace so as to be movable within the annealing furnace between a forward position in which they contact the excitation conductor and a retracted position in which they are separated from the excitation conductor; A wound iron core magnetic field annealing apparatus comprising: an electrode; and an excitation power source that supplies current to the excitation conductor through the first and second excitation movable electrodes.