JPS58123826A - Magnetic field annealing equipment - Google Patents

Abstract

PURPOSE:To perform safely and continuously a magnetic field annealing of an iron core by cutting off an electric source with a limit switch during insertion and pulling out of the iron core in annealing of the core in the magnetic field generated by large current. CONSTITUTION:An wound iron core 2 is inserted to the one side of a pair of conductors 3, an electric circuit is formed and covers 8 of a carrying in part 1a and a carrying out part 1b of the iron core. Thus, the limit switch 9 is actuated to function a driving part of an AC voltage controller 7. DC current is passed to the conductor 3 through a transformer 6 and DC source apparatus 5 to give a magnetic field to the core 2 to perform the annealing. When the core 2 in an annealing furnace 1 is moved at every constant time and reach to the part 1b, the core 2 is carried out at the part 1b band the core 2 is inserted to the conductor 3 at the part 1a. In this time, the cover 8 is opened to make the switch 9 OFF state, thus the source of the controller 7 becomes OFF state and the cutting off of DC large current can be performed easily and safely.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an annealing apparatus for annealing an iron core made of, for example, an amorphous magnetic material used in electrical induction equipment by passing a large current through the iron core and annealing the iron core in a magnetic field.

Iron cores made of amorphous magnetic materials used in electrical induction equipment, etc., exhibit remarkable magnetic properties during annealing performed after forming, such as by annealing in a magnetic field and controlling the cooling rate during cooling after maintaining a constant temperature. Improved. As an example of the annealing conditions obtained through experiments conducted by the present applicant, the magnetic field strength of Hiroko was required to be 1 to 10.

On the other hand, when mass producing iron cores for electric induction equipment, it is common to use a continuous annealing furnace in terms of annealing time and economy. There is a roller house method in which the material to be annealed is transferred through the rotation of rollers.

By the way, in order to continuously annealing a wound core in a magnetic field, a pair of conductors that pass a positive or negative direct current are placed in the furnace, one of the two conductors is inserted into the wound core, and the conductor is connected to this conductor. This is done by transferring the wound core through the furnace while applying direct current. Therefore, before and after the annealing furnace, the wound core is inserted into the conductor, and the 4u
), and at that time it is necessary to temporarily remove the direct current.

For example, if we consider the case of annealing a wound core in a magnetic field with a magnetic field strength of 1 - and an average magnetic path length of 1 k, the DC exciting current is 100
If a person directly interrupts such a large DC current, there is a danger of electrical sparks, so one of the difficulties is the work of inserting and removing the wound core into the conductor, including turning on and turning off the power. Therefore, in consideration of safety, a nine-continuous annealing furnace equipped with nine direct current control devices is required.

The present invention has been made in response to the above-mentioned needs, and an object of the present invention is to provide a magnetic field annealing apparatus that is capable of turning on and cutting off a large current with high efficiency and safety.

Embodiments of the present invention will be described below with reference to the drawings.

Figure 1 shows the structure of a continuous magnetic field annealing furnace. Inside the annealing furnace 1, a pair of rod-shaped conductors 3 are arranged in parallel to flow a rounded positive or negative current that applies a magnetic field to the wound core 2. has been done. This pair of conductors 3 protrudes to the core insertion part 1a and the core protrusion part 1b outside the furnace, and one end of these is connected by a connecting piece 4, and the other end is connected to a DC power supply device 5, respectively. When DC current is applied, a magnetic field can be seen in the wound core 2 during annealing. The DC power supply device 5 is connected to an AC power source via a transformer 6 and an AC voltage regulator 7.

Further, the core loading section 1a and the core loading section 1b are each protected by a cover 8 with a limit switch 9 attached thereto.
The limit switch 9 is activated by opening and closing the cover 8, and the signal thereof is fed back to the AC voltage regulator 7. This AC voltage regulator 7 has a structure driven by a motor drive system, and its drive section operates in conjunction with the 0N-OfI'F signal of the limit switch 9, gradually raising and lowering the DC excitation voltage. It is.

Figure 2 shows the core loading section 11 and core unloading section 1 of the annealing furnace 1.
Aya 1 shows the state in which each cover 8 of b is closed.
As shown in the figure, the limit switch 9 is activated and the AC voltage regulator 7 is activated only when both covers 8 are closed, and when either one is open, the limit switch 9 is connected in series. OK' because it is connected to 1? In this state, the AC voltage regulator 7 does not operate.

Next, the effect will be explained. In such a configuration,
When the wound core 2 is inserted into the conductor 3, a current circuit is formed, and the covers 8 of the core loading section 1a and the core loading section 1b are closed, the limit switch 9 is activated and the drive section of the AC voltage regulator 7 is activated. Since the drive part of this AC voltage regulator 7 is a motorized 2-wave type, the voltage is gradually increased, and in conjunction with this device, the voltage of the companion DC voltage #5 is also gradually increased, and current flows through the conductor 3 and into the winding core. 2 is given a magnetic field.

When a magnetic field is applied to the wound core 2 and annealing begins, the wound core 2 moves within the annealing/Pl at regular intervals, and each time the current is cut off, the wound core is inserted into the conductor 3, and the current is turned on.

The wound core 2 that is first inserted into the annealing furnace 1 moves within the furnace at regular intervals, and when it reaches the core unloading section 1b, the wound core 2 is removed at the core unloading section 1b.

In the core loading section 1a, the wound core 2 is inserted into the conductor 3.

In this case, we will explain the DC current interruption and energization operations. First, in the core loading section 1a, in order to insert the wound core 2 to be annealed next into the conductor 3, the conductor 30 is energized and then interrupted. In this operation, the cover 8 that protects the core carrying-out section 1m is opened. With this operation, the limit switch 9 attached to the tip Klu) of the cover 8 is turned OFF, which is electrically interlocked with the limit switch 9, and the power of the motor drive unit of the AC voltage regulator 7 is turned OFF. Rounding off, the number of rotations gradually decreases until it stops. The voltage that is set by the voltage terminal of the AC voltage regulator 7 in accordance with this rotational speed gradually decreases, and then becomes zero voltage. Similarly to the DC power supply device 54 connected to the AC voltage regulator 7 via the transformer 6, the voltage gradually decreases, and the DC current appears to be zero. In this way, cutting off a large DC current can be done safely and easily by controlling the voltage on the AC side.

Next, perform the same interrupting operation as described above in the core unloading section 1b,
When the direct current is cut off, the connecting piece 4 connecting the pair of conductors 3 is removed, and the round-wound core 2 is deposited in a magnetic field annealing device. Thereafter, by closing the cover 8 and restoring the switch 9, the supply of direct current to the conductor 3 is started. By sequentially repeating these series of operations, it becomes possible to safely and continuously annealing the single-turn iron core 2 in a magnetic field, which is effective in improving work efficiency. In addition, the covers 8 attached to the core carrying-in section 1a and the core carrying-out section 1b serve as a safety device when accidentally inserting the wound core 2 into the conductor 3 and removing the connecting piece 4 during the passage. There is also
Moreover, since the energization operation can be performed at the place where the wound core 2 is inserted and taken out, there is an advantage that the working time is shortened.

As explained above, according to the present invention, it is possible to provide a magnetic field annealing apparatus that is highly safe against turning on and turning off large currents and is extremely effective in improving work efficiency.

[Brief explanation of the drawing]

Figure JI1 is a perspective view showing a continuous AM blunt furnace equipped with the DC current control device of the present invention, and Figure 2 is a perspective view showing the continuous annealing furnace with the safety covers of the core loading and unloading parts closed. be. 1... Annealing furnace, 2... Winding core, 3
... Conductor, 5 ... DC power supply device, 6 ... Transformer, 7 ... AC voltage regulator, 8 ... Cover, 9.・・・・・・
·Limit switch. (7317) Agent: Patent Attorney Noriyuki Chika (
1 other person) 1□ Figure 1 Figure 2

Claims (2)

[Claims] (1) A box-shaped furnace, a pair of conductors placed inside the furnace, and a conversion device using a screen-to-drive type AC voltage regulator to convert AC into DC, and convert the DC power into the DC power described above. 1. A magnetic field annealing device comprising: a direct current control device for supplying a direct current to a conductor. (2) The ring-shaped furnace is characterized in that it is equipped with a cover that covers each of its inlet and outlet, and that a series electric circuit is provided between a switch attached to these covers and an AC voltage V4 regulating device. A magnetic field annealing apparatus according to claim 1.