JPS6015104B2 - Bar electrical heating device - Google Patents

Description

Detailed Description of the Invention The present invention is for heating materials for hot processing such as forging by sequentially transferring and heating the materials to be heated.Further, for the purpose of uniform heating, the heating temperature region is divided into three It heats the heating material by sequentially transferring it to stages provided in each temperature zone, and is characterized by having upper and lower electrodes and end electrodes in appropriate combinations on each stage on the secondary side, making it economical and This invention relates to an electrical heating device with high productivity.

Conventionally, various devices have been proposed for transferring and heating a material to be heated in an electrical heating device. The applicant of this application also previously
No. 2-141923 ``Electrification heating device using three-phase AC transformer'' was filed.

However, in these energization heating devices, the transfer beam moves in a rectangular, circular, or elliptical circular trajectory, and the material to be heated is sequentially transferred to the lower electrode, and the material to be heated on the lower electrode is moved upward and downward. It was held between electrodes and heated with electricity. In the transfer device, a crank mechanism was used to move the transfer beam in a circular trajectory and transfer it onto the lower electrode.

This crank mechanism is rotated by a geared motor with a brake, and must be stopped at the stereotaxic layer after each rotation, making the mechanism complex and requiring a large installation space.
Moreover, it was an expensive transport package. The present invention has been made in view of the above-mentioned drawbacks, and unlike the conventional method in which the upper electrode moves up and down, the present invention is reversed and the lower electrode moves up and down. , material to be heated could be transferred above the lower electrode by moving the moving beam in the simplest straight line and by combining the lifting and lowering movement of the lower electrode. Furthermore, for the purpose of uniform heating, side electrodes and end electrodes are used in appropriate combinations on each stage provided with heating temperature zones on the secondary side of the transformer. Another objective is that by using a three-phase AC transformer with the primary and secondary windings connected in a △ or Y connection, the three-phase load can be almost balanced, reducing equipment costs and improving the power factor. The present invention aims to provide an electrical heating device that is economical and highly productive.

The configuration will be explained below by referring to one embodiment. 1 is a three-phase AC power supply; 2 is a three-phase AC transformer whose primary and secondary windings are Y-connected; and 3 is a switch mechanism provided on the primary side of the transformer 2.

4 is a device for joining the heated material M; 5 is a device having a plurality of notches 51 for supporting the heated material M in the upper part, a front downward slope 55 at the tip, and a cylinder 6 provided at the rear; A moving beam that reciprocates in the horizontal direction, and 7 denotes two rollers 71 positioned above the beam 5 and supporting the heated material M.
8 is a lower electrode having two rollers 81 which are located below the beam and move up and down by a cylinder 9 provided at the bottom and support a heated material M; 10 is a lower electrode which is heated. This is the chute that takes out the heated material.

Next, the effects will be explained. In order to heat the material M to be heated to a desired temperature, a notch 5 provided in the moving beam 5 is used to transfer the material M from the supply device 4 to above the lower electrode 8.
1 supports a heated material M, and the moving beam 5 is advanced by a cylinder 6 so that the heated material M on the moving beam 5 is placed above the lower electrode 8.

Then, when the lower electrode 8 is raised by the cylinder 9,
The heated material M on the moving beam 5 is supported by rollers 81, and when it is further raised, it is held between the roller 71 of the upper electrode 7 provided above.

Then, when the switch mechanism 3 provided on the primary side is closed to allow current to flow, the material to be heated M is heated.

Moreover, the moving beam 5 is retreated to the original position by the cylinder 6. When the switch mechanism 3 is turned off after a predetermined period of time has elapsed, the material to be heated M has been heated to a desired temperature.

Then, when the lower electrode 8 is lowered by the sill 9, the material to be heated M is placed on the inclined tip portion 55 of the moving beam 5,
It moves on the moving beam 5 due to its own weight, falls onto the chute 10, and is discharged.

Next, regarding another embodiment, a case will be described in which the heating temperature region is divided into three and applied to divided heating.

When heating the material to be heated, a case will be described in which one side of the material to be heated is heated. As an electrode that heats and heats the material to be heated, the upper electrode is used to heat the material to be heated M in the first and second stages.
A pair of electrodes 7a sandwiching the central part and the vicinity of the ends of the electrodes 7a.
, 7, 7b, 7b', and the heated material M is in the third stage.
Similarly to the upper electrode 7, the lower electrode is provided with an electrode 7C that holds the central part of the heated material M on the first and second stages.
a pair of electrodes 8a each supporting the center and the vicinity of the ends of the
, 8a', 8b, 8b' and the third stage are heated materials M.
An electrode 8C and a lifting support 13 are provided to hold the central part of the material M, and an end electrode 11 is actuated by a cylinder 12 at a position where the material M to be heated is raised by the lower electrode 8, and supports the end surface of the material M to be heated. The second and third stages are provided with electrodes 11b and 11C that sandwich one side of the heated material M. To heat the heated material M to the desired temperature, measure the time required to reach the final heating temperature in advance and
It was divided into equal parts to determine the heating time for each stage.

Then, the electrode 7a with the heated material M provided on the first stage,
7a', 8a, 8, the material to be heated M on the supply device 4 is supported in the notch 51 provided in the moving beam 5, the moving beam 5 is advanced by the cylinder 6, and the heated material M on the supply device 4 is moved forward by the cylinder 6. Transfer the heated material M to above the lower electrodes 8a, 8a',
Next, the lower electrodes 8a, 8 are raised by the cylinder 9, the material to be heated M on the moving beam 5 is supported by the roller 81, and the lower electrodes 8a, 8 are further raised to move the upper electrodes 7a, 7a'' located above to the o-ra 71. The material to be heated M is held between the

During heating, the load is initially placed in one place, but one side of the electrodes 7 and 8 of each stage is placed in the third place so that the current flows.
As shown in the figure, a three-phase four-wire system is used, which is connected to the neutral wire of the secondary winding of the transformer. Then, the switch mechanism 3 provided on the primary side is closed to allow current to flow, and the moving beam 5 is retreated to the original position by the sill 6.
The material to be heated M is heated first between the electrodes 7a and 7, and when the material to be heated M reaches a predetermined temperature after a predetermined time, the switch mechanism 3 is opened. Next, the heated material M of the first stage heated to a predetermined temperature and the heated material M newly placed on the notch 51 of the moving beam 5 are transferred above the lower electrodes 8b and 8a of the second and first stages. Then, when the lower electrode 8 is lowered by the cylinder 9 on the same machine as above, the lower electrode 8
The upper heated material M is supported in the notch 52 of the moving beam 5. Then, the moving beam 5 is advanced by the cylinder 6,
The heated material M on the moving beam 5 is transferred between the upper and lower electrodes 7 and 8 of the second and first stages, and then transferred to the lower electrodes 8b and 8.
The heated material M on the movable beam 5 is supported by the rollers 81, and the heated material M is supported between the rollers 71 provided on the upper electrodes 7b and 7a by further raising the moving beam 5. to hold. Then, the switch mechanism 3 provided on the primary side is closed to allow current to flow, and the moving beam 5 is moved to the cylinder 6.
to retreat.

After a predetermined period of time, the end face electrode 11b is further crimped onto the heated material M in the second stage using a sill 12, and the upper electrodes 7 and 7' provided in the center and near the end face in the first stage and the second stage create a space between them. The end surface portion of the material to be heated M that has been heated in advance is actively heated so that the desired heated portion is uniformly heated. Then, the heating is performed for a predetermined period of time, and when the desired heating temperature is reached, the switch mechanism 3 is opened. Next, the end electrode 11b is retracted by the cylinder 12 to transfer the heated materials M in the second and first stages and the heated materials M at room temperature to the third, second and first stages, respectively, using a cylinder 12 in the same manner as described above. 9 lower electrode 8b,
8a, the material to be heated M is moved through the notch 52 of the moving beam 5,
53 to fight against Qin, then use cylinder 6 to move beam 5
This is done by moving forward. Then, the lower electrodes 8C, 8b, 8a and the lifting support 13 are raised by the cylinder 9, the heated material M on the moving beam 5 is supported by the roller 81, and the upper electrode 7C, which is located above, is further raised.
The material to be heated M is held between the rollers 71 provided on the rollers 7b and 7a, and in the third stage it is brought into contact with the end face electrode 11C, and the switch mechanism 3 provided on the primary side is closed to allow current to flow. The moving beam 5 is retreated to its original position by the cylinder 6. The heated material M in the third stage is heated slightly between the upper electrodes 7 and 7' in the center and near the end surface until the second stage due to current flowing between the end surface electrode 11C and the upper and lower electrodes 7C and 8C. However, in the third stage, the end surface portion was actively heated and the desired heated portion became uniform in temperature. Then lower electrode 8
When the material M is lowered by the shilling 9, the material to be heated M in the third stage is hit by the inclined tip 55 of the moving beam 5, transferred under its own weight, falls onto the chute 10, and is discharged. In the above embodiment, the end electrode provided on the second stage was inserted during heating, but even when the size, material, etc. of the material to be heated M is different, uniform heating can be achieved by arbitrarily changing the insertion time. In addition, in the embodiment described above, heating of one side of the material to be heated has been described, but for heating the entire material to be heated, the end surface electrode 1 can also be newly added.
By providing 1b and 11C, uniform heating can be achieved by operating the moving beam in the same manner as described above to sequentially transfer and heat. The present invention consists of the above-mentioned configuration,
Conventionally, the upper electrode was moved up and down, but the lower electrode was moved up and down, and the material to be heated was moved one stage by combining the up and down movement with the linear movement of the moving beam, and the lower electrode was moved up and down. It is transferred to the upper part and heated to the desired temperature between the electrodes, and the upper and lower end face electrodes are used in appropriate combinations on each stage provided on the secondary side of the transformer according to the heating temperature range. By using a three-phase AC transformer in which the primary and secondary windings are connected in a △ or Y-connection, the three-phase load can be almost balanced, making it economical and easy to manufacture. It is extremely useful industrially as it enables highly efficient electrical heating.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and Fig. 1A is a front view showing a mechanism for transferring a heated material between upper and lower electrodes using a moving beam, and Fig. 2 is another embodiment. FIG. 3 is a perspective view showing an electrical heating device using a three-phase AC transformer having Y-Y three-phase four-way wiring. 1: Three-phase AC power supply, 2: Three-phase AC transformer, 3: Switch mechanism, 5: Moving beam, 6: Cylinder, 7: Upper electrode, 8: Lower electrode, 9: Silling, 11: End electrode. Figure 1 Figure 2 Figure 3

Claims (1)

[Scope of Claims] 1. A device for transferring and heating a material to be heated to an electrode provided on the secondary side of a transformer, comprising: a moving beam provided with a notch for supporting the material to be heated in the upper part and reciprocated by a drive mechanism; A fixed upper electrode located above the beam and a lower electrode located below the beam and movable up and down are provided, the material to be heated on the beam is raised to the upper electrode by the lower electrode,
An electric heating device for a bar material, characterized in that the material to be heated is held between an upper electrode and electrically heated. 2 In a device that transfers and heats a material to be heated to the first to third stage electrodes provided on the secondary side of a transformer, a moving beam is provided with a plurality of notches for supporting the material to be heated in the upper part and moves back and forth by a drive mechanism. and 1 each for the 1st and 2nd stages.
A pair of fixed upper electrodes located above the beam on at least one side of the third stage, and a pair of fixed upper electrodes on each of the first and second stages corresponding to the upper electrode; a lower electrode that is located below the beam and moves up and down; and an end face electrode that clamps the end face of the heated material at a position where the heated material is raised by the lower electrode on at least one side of the second and third stages. A bar material energization heating device characterized in that the material to be heated on the beam is raised to the upper electrode by the lower electrode, and the material to be heated is held between at least one of the upper electrode and the end face electrode to perform energization heating. . 3. A rod current heating device according to claim 2, which uses a three-phase AC transformer in which the primary and secondary windings are Δ or Y-connected as a power transformer.