JP3077367B2 - Electrode connection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for adding a new electrode to an electrode mounted on an electric furnace, and more particularly to an electrode connecting method characterized by a method of centering electrodes.

[0002]

2. Description of the Related Art In an arc furnace in which an arc is generated between an electrode inserted into a furnace and a raw material to melt the raw material, the electrode is consumed while the operation is continued. Therefore, in such an arc furnace, in such an arc furnace, the electrode is made to enter into the inside of the electrode hole of the furnace lid, the electrode is held by a holding body, and a new electrode is provided for the electrode. And so on.

[0003] Here, as a conventional method of connecting electrodes, as shown in FIG. 5, an electric furnace 1 is hung with a crane 102 suspending an electrode 100 to be added.
The electrode 100 of the electric furnace 104 is moved to a position above the electrode 106 of the electric furnace 104.
6. Screwing and connecting to the screw portion 110 formed at the upper end.

However, in the case of this method, it is difficult to accurately align the electrode suspended by the crane with the electrode of the electric furnace, and there has been a problem that much time and labor are required.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and the gist of the present invention is that a new electrode to be added to an electrode mounted on an electric furnace is crane-mounted. When the suspended electrodes are moved down to the electrodes of the electric furnace in a state of being suspended by the transport apparatus and the suspended electrodes are lowered to connect the pair of electrodes, the electrodes are disposed in the vicinity of the electrodes of the transport apparatus and the electric furnace. By applying a display mark to either one of the stationary member and the other, a laser projector is provided, and the laser beam from the projector is moved and positioned by moving the transport device so as to aim at the display mark. In other words, the central positions of the pair of electrodes are aligned.

[0006]

According to the present invention, according to the present invention, one of a transfer device such as a crane or a stationary member near the electrode of an electric furnace, for example, a laser projector is provided on the transfer device side, and a display mark is provided on the other. By moving the transfer device while confirming the irradiation position of the laser beam emitted from the projector, the electrode to be added can be quickly moved to the target position and accurately stopped at the target position.

As a result, the work of aligning the electrodes can be performed easily and quickly, and the time required for the work of connecting the electrodes can be shortened.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings. In FIG. 1, reference numeral 10 denotes an electric furnace (arc furnace).
As shown in FIG. 3, three electrodes 12 made of graphite are used.
a, 12b, and 12c are mounted.

The electrodes 12a, 12b, and 12c are formed in the holding holes 2 at the tip of the holding arm 18 as shown in FIG.
It is gripped at 0.

In FIG. 1, reference numeral 14 denotes a connecting device for adding a new electrode 12d to the electrode 12a, 12b or 12c of the electric furnace.
It is a crane suspended and transported together. The crane 16 has a laser projector 15 provided vertically downward.

On the other hand, as shown in FIG. 3, the stationary plate 11 fixedly disposed near the electric furnace 10 has display marks 13A ₁ , 13A ₂ , 13B ₁ , 13B ₂ , 13C.
₁ , 13C ₂ are applied.

Of these, the display marks 13A ₁ , 13A
A ₂ are those corresponding to the electrode 12a, also mark 13B _1, 13B ₂ corresponds to the electrode 12b, those further mark 13C _1, 13C ₂ are respectively corresponding to the electrode 12c.

Of these display marks, 13A ₂ , 13A
B ₂ and 13C ₂ indicate that the center position of the electrode 12d held by the connecting device 14 is changed to the electrodes 12a and 12b mounted on the electric furnace 10 when the laser light emitted from the projector 15 is irradiated on these marks. , 12c are preliminarily selected so as to exactly match the center position.

The electrodes 12a, 12 mounted on the electric furnace 10
As shown in FIG. 2, a female screw hole 22 is formed at the upper end of each of b and 12c, and a nipple 24 previously mounted on an electrode 12d to be newly added is screwed into the female screw hole 22. As a result, the electrodes 12a, 1
2b or 12c and 12d are connected.

The nipple 24 is made of graphite of the same material as the electrodes 12a to 12d, has a male screw formed on the outer peripheral surface, and has a half in the axial direction in the female screw hole 26 of one electrode 12d and the other half in the other. Are screwed into the female screw holes 22 of the electrodes 12a to 12c.

The electrode connecting device 14 has an outer cylinder 28, an intermediate cylinder 30, and an inner cylinder 32, as shown in detail in FIG. The wire 36 is raised and lowered by winding and lowering of the wire 36 by 34.

That is, the winding up and down of the wire 36 causes the outer tube 28 and the intermediate tube 30 to be housed in the state shown in FIG. 2B and to be protruded in the state shown in FIG.

The connection device 14 has a motor 38 with a speed reducer for rotating and driving the electrode 12d, and a transmission shaft 40 for transmitting the driving force.

A nipple fitting 42 as a pseudo nipple is attached to the lower end of the conduction shaft 40. The conduction shaft 40 is connected to the electrode 12d by screwing the nipple fitting 42 into the female screw hole 22 in the electrode 12d. 12d is suspended via the transmission shaft 40.

On the other hand, a screw shaft 44 is provided at the upper end of the transmission shaft 40, and the screw shaft 44 is screwed to a female screw member 46 disposed at a fixed position.

At the upper end of the screw shaft 44, a large-diameter head 47 having a square cross section is formed. This head 47 is relatively unrotatable with a cylindrical body 48 having a rectangular cross section that rotates integrally with the motor 38. They are fitted so as to be relatively movable in the axial direction.

An engaging projection 50 is provided at the lower end of the outer cylinder 28 of the connecting device in a downward direction.
An engagement groove 5 is provided between a pair of long ribs
2 is formed, and the downwardly facing convex piece 50 is
2 so that they engage each other.

Next, a method of adding electrodes using the present apparatus will be described. In the method of this embodiment, the electrode 12d is held by the connecting device 14 by screwing the nipple fitting 42, and the crane 16 conveys the electrode 12d along the trajectory 17 shown by the dashed line in FIG.

Then, for example, the new electrode 12d is connected to the electric furnace 1
When adding to the electrode 12a of 0, the crane 1
First crane to a position where the projector 15 provided on the 6 illuminates the display mark 13A ₁ was subjected to the stationary plate 11 1
6 is moved, and furthermore, as shown in FIG.
The crane 16 is continuously moved with the height position of the display mark set to an appropriate height position, and the laser beam from the projector 15 is displayed on the display mark 1.
3A ₂ is moved to the position where it is just irradiated, and stopped there.

At this time, the center positions of the electrodes 12d and 12a are exactly coincident with each other. As shown by the broken line in FIG. It comes into contact with the other vertical rib 51.

Then, subsequently, the electrode 12d is connected to the connecting device 1
4, while slightly lowering the motor 3 of the connecting device 14.
At 8, the electrode 12d is rotationally driven.

Then, the nipple 24 at the lower end of the electrode 12d enters the female screw hole 22 of the electrode 12a and is screwed into the female screw hole 22 to couple the pair of electrodes 12a and 12d.

At this time, the convex piece 50 enters the engaging groove 52 on the outer peripheral surface of the gripping arm 18 and receives a reaction force due to the rotation driving of the electrode 12d.

Although the embodiment of the present invention has been described in detail, this is merely an example. For example, the connecting device 14 may have various other configurations as appropriate, and in some cases, the projector 15 may be provided on the stationary plate 11 side with a crane 16.
It is also possible to provide a display mark on the side of.

The present invention does not depart from the spirit of the present invention, for example, by setting a sensor for sensing light on the display mark portion and automatically detecting the emitted light to shift to the next step. The present invention can be implemented in a form in which various changes are made based on the above.

[Brief description of the drawings]

FIG. 1 is a schematic view of an apparatus for carrying out a method according to an embodiment of the present invention and an electric furnace.

FIG. 2 is a detailed view of a main part of the electrode connection device in FIG.

FIG. 3 is a plan view of an electric furnace and peripheral parts.

FIG. 4 is an explanatory diagram of a procedure for connecting electrodes.

FIG. 5 is an explanatory diagram for explaining the background of the present invention.

[Explanation of symbols]

10 electric furnace 12a, 12b, 12c, 12d electrode 16 cranes _{13A 1, 13A 2, 13B 1} , 13B 2, 13C 1, 13
C ₂ display mark 15 laser projector

Continuation of the front page (56) References JP-A-56-54787 (JP, A) JP-A-3-588 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H05B 7 / 14 F27D 11/10

Claims (1)

(57) [Claims] 1. A new electrode to be added to an electrode mounted on an electric furnace is moved over an electrode of the electric furnace while being suspended by a transfer device such as a crane, and the suspended electrode is lowered. When connecting the pair of electrodes, a display mark is provided on one of the transfer device and a stationary member arranged near the electrode of the electric furnace, and a laser projector is provided on the other, and the laser from the projector is provided. An electrode connection method, comprising: adjusting the center positions of the pair of electrodes by moving and positioning the transport device so that light is aimed at the display mark.