JPH086238Y2 - Electrode holder cleaning device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode holder cleaning device, and more particularly to a device for automating the cleaning work of the inner surface of an electrode holder in an electric arc furnace.

[0002]

2. Description of the Related Art In an electric arc furnace, an electric arc is generated between a graphite electrode and a molten material to melt the material. The graphite electrode is held by an electrode holder, and the electrode holder is controlled to move up and down. Maintain a stable electric arc. Then, during operation of the electric arc furnace, since a high-voltage large current (tens of thousands of amperes or more) is flowing in the contact surface between the electrode holder and the graphite electrode, local electric sparks easily occur at the contact surface, Further, since the graphite electrodes are slid in the electrode holder while being appropriately added, solid dust such as graphite particles adhere to the inner surface of the electrode holder on the electrode contact side.

In this case, irregularities are formed on the contact surface, which deteriorates the electrical contact state and induces a larger spark. As a result, a large amount of melting damage occurs on the inner surface of the electrode holder, and in an extreme case, a water leakage accident from the cooling water flow passage formed inside the electrode holder may be caused, forcing the electric arc furnace to stop operating. is there.

Therefore, conventionally, the work of cleaning the inner surface of the electrode holder after the completion of the steelmaking by the electric arc furnace and the elapse of a certain cooling time has been incorporated as a daily routine.
A worker on site removes the solid dust adhering to each electrode holder using a polishing brush with a handle.

[0005]

By the way, the above-mentioned cleaning work is extremely bad because dust is scattered at the time of brushing and the cooling time is taken into consideration, but the site is still filled with hot air. It is done in a work environment.
Further, since the above-mentioned work is performed in a mode in which the brush portion is slid on the inner surface of the electrode holder while supporting the heavy polishing brush from the upper side of the electrode holder, the work efficiency is poor,
It usually takes 2 to 3 hours, and the operating efficiency of the electric arc furnace is reduced by the estimated time. Further, since the work is manually performed, cleaning unevenness is generated and it is difficult to restore a good electrical contact surface.

Therefore, the present invention provides an electrode holder cleaning device capable of automating the cleaning operation of the inner surface of the electrode holder, which saves the labor and time of the operator, and the electrode holder and the graphite electrode during the next steelmaking operation. It was created with the aim of ensuring that the electrical contact conditions of the

[0007]

According to the present invention, a frame structure whose open end side is engaged and fitted with an outer peripheral portion of an electrode holder of an electric arc furnace and a radius of curvature of an inner surface of an electrode contact side of the electrode holder are slightly smaller than a radius of curvature. A polishing brush having a large radius, a rotary drive unit that rotates the polishing brush by fixing a rotary shaft to the center of the polishing brush, and an engagement formed between the frame structure and the rotary drive unit. A sliding mechanism, a guide portion for guiding the polishing brush into the electrode holder,
The present invention relates to an electrode holder cleaning device, which is fixed to the frame structure and includes an elevating and lowering drive unit that moves the rotation and drive unit up and down.

Further, if the frame structure other than the open end side is covered with a plate material and a dust collecting device for sucking and collecting dust from the inner space through a hole formed in the plate material is added, dust during operation thereof is added. Measures can be taken.

[0009]

[Operation] With the open end of the frame structure engaged and fitted to the outer periphery of the electrode holder and the rotation drive unit is activated,
The lifting drive unit moves the rotation drive unit to the electrode holder side. During the movement, the guide portion guides the rotation driving portion and plays a role of fitting the polishing brush to the electrode holding hole of the electrode holder. Then, the rotating polishing brush has its brush portion bent and fits inside the electric holder, and the brush portion scrapes the inner surface of the electrode holder with a constant surface pressure to remove solid dust attached to the inner surface. . The lifting drive unit strokes the rotation drive unit to rub the polishing brush on the entire inner surface of the electrode holder to clean the entire inner surface.

By the way, a reverse rotation torque is generated in the rotary drive unit with the abrasion rotation of the polishing brush, but the frame structure receives the reverse rotation torque via the guide mechanism. However, since the frame structure is engaged / fitted to the electrode holder, the rotation of the rotation drive unit in the torque direction is stopped. Therefore, there is no problem even if the rotation drive unit has a connection structure having a rotation degree of freedom with respect to the elevation drive unit,

[0011]

Embodiments of the electrode holder cleaning apparatus of the present invention will be described in detail below with reference to the drawings. First, FIG. 1 is a sectional view of the electrode holder cleaning device attached to the electrode holder.
FIG. 2 is a plan view (cross section taken along the line AA of FIG. 2). In each drawing, 1 is an electrode holder of an electric arc furnace, 2 is an electrode holder cleaning device, and the electrode holder cleaning device 2 is suspended by four wire ropes connected to a suspension metal fitting 4 on the upper side of the electrode holder cleaning device. When it is conveyed to the upper side of the electrode holder 1 by a crane or the like, it is lowered and is engaged / fitted to the upper surface of the electrode holder 1 as shown in FIG.

The electrode holder cleaning device 2 comprises a frame structure 5, a disk-shaped polishing brush 6, a motor 7, a guide mechanism 8 and an air cylinder 9. The air cylinder 9 has one end of the frame structure 5. It is suspended while being fixed to the center of the upper side, and the motor 7 is connected to its operating rod.
It has a structure in which the polishing brush 6 is hung and attached to the rotation shaft of a motor 7. However, the radius of the polishing brush 6 is slightly larger than the radius of curvature R of the electrode contact side inner surface 1a of the electrode holder 1.

Here, the frame structure 5 is a four-legged structure in which a pair of U-shaped frames (made of steel) are welded in combination with each other at the notches formed in each intermediate span portion.
The lower end surface on the open side of the leg is in a positional relationship where it abuts on the upper surface of the electrode holder 1 in a state where the polishing brush 6 is fitted in the electrode holding hole of the electrode holder 1, and the electrode holder is provided on the outer side of each leg. Engagement members 10a, 10b (each pair) that engages / fits to the outer peripheral portion of 1
Are welded. Reference numeral 11 is a reinforcing plate additionally welded to the combined welded portion of each U-shaped frame. As for the engaging members 10a and 10b, since the normal electrode holder 1 has a horseshoe-shaped planar shape as shown in FIG. 2, the member 10a that engages with the tip end side surface of the electrode holder 1 has an outward facing portion. Is relatively short, and the member 10b that engages the side surface of the electrode holder 1 is long, and the outer peripheral surface of the electrode holder 1 is held by the four engaging members 10a and 10b.

On the other hand, the guide mechanism 8 has a guide rod 8a attached along the longitudinal direction inside one leg of the frame structure 5, and both ends are formed in an L shape in the opposite direction and one end is It consists of an engaging frame 8b fixed to the side of the motor 7, and a hole through which the guide rod 8a penetrates is formed at the other end of the engaging frame 8b, while stopping the rotation of the motor 7 itself. The motor 7 is guided vertically. In addition, 12 is a small TV camera attached to the lower end surface of the engaging frame 8b, and a wiper is attached to the incident part of the image light.
(Not shown) is provided and the inner surface of the electrode holder 1 can be photographed at wide angle.

The driving air supply pipes 13a and 13b for the air cylinder 9 and the electric system cable 14 for the motor 7 and the television camera 12 penetrate the leg portions of the frame structure 5 and an external control unit (not shown). ). However, the electric system cable 14 is a cable that can expand and contract between the motor 7 and the frame structure 5.

Next, the structure of an electrode holder cleaning device according to another embodiment is shown in FIG. 3 (a plan view in a state where the electrode holder cleaning device is attached to the electrode holder) and FIG. 4 (a cross section taken along the line BB in FIG. 3). It will be explained using FIG. In this embodiment, the basic structure of the electrode holder cleaning device 2 is almost the same as that of the above-mentioned embodiment, and those having the same reference numerals as those shown in FIGS. 1 and 2 correspond to the same elements. Therefore, detailed description thereof will be omitted.

The first characteristic of the apparatus of this embodiment is that the frame structure 5 is covered with a plate material (aluminum plate or steel plate) except for the open end side. That is, the tubular plate 15 is attached so as to cover the outer sides of the four legs of the frame structure 5, and the circular plate 16 is attached to the upper surface.
A second feature is that a hole 17 is formed in a portion of the circular plate 16 other than the joining region with the frame structure 5, and a small dust collector 19 is connected to the hole 17 via a duct 18. There is a point. It should be noted that the tubular plate 15 and the circular plate 16 that cover the frame structure 5 need not be completely sealed, and simple attachment with bolts or the like is sufficient.

The operating state of the apparatus of the above embodiment is shown in FIG.
Will be explained. However, since the cleaning operation of the electrode holder 1 by the first embodiment device (FIGS. 1 and 2) and the second embodiment device (FIGS. 3 and 4) is the same, the second embodiment device will be described here. (FIGS. 3 and 4) will be described. First, FIG.
In the state shown in (1), the motor 7 is activated to rotate the polishing brush 6 and also the dust collector 19 to activate the suction from the internal space 20 of the frame structure 5.

In the initial state, the polishing brush 6 is positioned above the electrode holder 1 with the rod of the air cylinder 9 retracted, but the supply of air to the drive air supply pipes 13a and 13b is performed. The rod of the air cylinder 9 is operated in the protruding direction by the control, and the motor 7
Move down. At this time, the motor 7 is guided by the guide mechanism 8
While being guided by, the polishing brush 6 moves downward, and accordingly, the rotating polishing brush 6 is fitted into the electrode holding hole of the electrode holder 1. That is, as described above, the radius of the polishing brush 6 is slightly larger than the radius of curvature R of the inner surface 1a of the electrode holder 1, but due to the nature of the brush, the electrode holder 1
By rubbing against the inner surface 1a of 1 and bending each fibrous portion in a direction opposite to the rotational direction, the polishing brush 6 is fitted into the electrode holding hole of the electrode holder 1.

FIG. 5 shows a state in which the rod protruding step of the air cylinder 9 progresses and the polishing brush 6 is completely inserted into the electrode holding hole of the electrode holder 1. As shown in the figure,
In this state, the polishing brush 6 is rotating while pressing the outer peripheral portion of the brush against the inner surface 1a of the electrode holder 1 with a constant pressure, so that the inner surface 1a of the electrode holder 1 slides and scrapes.
On the other hand, in that state, a reverse rotation torque acts on the motor 7 itself as a reaction due to the rotation of the polishing brush 6, but the guide mechanism 8 guides the vertical movement of the motor 7 and engages the engagement frame 8b. Guide rod 8 on the frame structure 5 side
Since the frame structure 5 is engaged with and fitted to the outer peripheral surface of the electrode holder 1 as shown in FIG. 3, rotation of the motor 7 itself due to the reverse rotation torque is prevented. It will be stopped.

Therefore, as described above, by sliding and rubbing the inner surface 1a of the electrode holder 1 while the brush of the polishing brush 6 is pressed, the solid dust 21 of the graphite electrode adhering to the inner surface 1a is wiped off. It Then, the drive air supply pipe 13a,
When the rod of the air cylinder 9 is stroked by the air supply control to the 13b, the motor 7 and the polishing brush 6 reciprocate through the electrode holding hole of the electrode holder 1 while being guided by the guide mechanism 8, and the electrode contact side by a predetermined number of reciprocations. It is possible to completely clean the inner surface 1a of the. In addition, whether the solid dust 21 is completely removed is determined by the TV camera 12
The image taken by can be confirmed by displaying it on a monitor (not shown) via the electric cable 14, and for areas where solid dust 21 adheres firmly and cannot be wiped off with the normal number of round trips, the monitor screen It is also possible to check the area and brushing intensively.

By the way, the solid dust 2 from the polishing brush 6
In the wiping step of 1, the exfoliated graphite particles are scattered in the air. Although the first embodiment apparatus shown in FIGS. 1 and 2 does not take the countermeasure, this embodiment apparatus (see FIG.
5 to FIG. 5), the cylindrical plate 15 and the circular plate 16 are covered by the frame structure 5 and the dust collecting device 19 is additionally provided, and the graphite particles separated by the polishing brush 6 are always in the frame structure. Five
Is sucked toward the side of the internal space 20 and is further collected from the internal space 20 via the duct 18 by the dust collector 19. Therefore, the installation site of the electric arc furnace is not polluted by the graphite particles scattered in the cleaning process, and the burden required for cleaning work after steel making can be reduced.

The transportation of the electrode holder cleaning device 2, the fitting to the electrode holder 1, and the above-mentioned operation control can all be executed by remote control from a control room or the like, and it is possible for an operator to be present at the site. I don't need it. It should be noted that the frame structure 5 shown in each of the embodiments only needs to have a function of being engaged / fitted and fixed to the outer peripheral portion of the electrode holder 1.
A leg structure may be adopted, or a structure in which a reinforcing annular body is attached to a key part of the leg may be adopted, and the modification is arbitrary as long as it fulfills the above-mentioned function. Also, air cylinder
A hydraulic cylinder or an electric lifting device can be applied to 9, and the guide mechanism 8 is not only the mechanism shown in each embodiment, but also various mechanisms having both a vertical guide function and an engaging and stopping function against rotational torque. Can be adopted.

[0024]

EFFECT OF THE INVENTION The electrode holder cleaning device of the present invention has the following effects due to the above configuration. The invention of claim 1 automates the cleaning work of the inner surface of the electrode holder, which has been performed in a bad working environment after the steelmaking work by the electric arc furnace is completed, so that the labor and time burden of the worker is greatly increased. Reduce to. Further, since the solid dust adhering to the inner surface of the electrode holder can be completely removed, the electric contact state with the graphite electrode can always be maintained in a good state, and the electrode holder is melted due to the generation of electric sparks and the cooling water accompanied therewith. It is possible to prevent a water leakage accident, and as a result, it is possible to extend the life of the electrode holder. According to the second aspect of the present invention, graphite particles and the like scattered during the cleaning operation of the inner surface of the electrode holder are efficiently collected to prevent the work site from being contaminated and the burden required for the cleaning work is reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state in which an electrode holder cleaning device is attached to an electrode holder according to the first embodiment (A-A in FIG. 2).
It is a cross-sectional view).

FIG. 2 is a plan view showing a state in which an electrode holder cleaning device is attached to an electrode holder according to the first embodiment.

FIG. 3 is a plan view showing a state in which an electrode holder cleaning device is attached to the electrode holder according to the second embodiment.

FIG. 4 is a cross-sectional view of the second embodiment with the electrode holder cleaning device attached to the electrode holder (BB in FIG. 3).
It is a cross-sectional view).

FIG. 5 is a cross-sectional view (cross-section taken along the line BB in FIG. 3) showing a state in which the polishing brush is fitted into the inner surface of the electrode holder 1 and the cleaning operation is being executed in the second embodiment.

[Explanation of symbols]

1 ... Electrode holder, 1a ... Inner surface of electrode holder on electrode contact side, 2 ...
Electrode holder cleaning device, 3 ... Wire rope, 4 ... Hanging metal fittings,
5 ... Frame structure, 6 ... Abrasive brush, 7 ... Motor (rotational drive), 8 ... Guide mechanism (guide), 9 ... Air cylinder
(Elevation drive unit), 10a, 10b ... Engaging member, 11 ... Reinforcing plate, 12 ...
Small TV cameras, 13a, 13b ... Drive air supply pipe, 14
… Electrical cable, 15… Cylinder plate, 16… Circular plate, 17… Hole,
18 ... Duct, 19 ... Dust collector, 20 ... Internal space, 21 ... Solid dust, R ... Radius of curvature of the electrode contact side inner surface of the electrode holder.

Claims (2)

[Scope of utility model registration request] 1. A frame structure whose open end side engages and fits with an outer peripheral portion of an electrode holder of an electric arc furnace, and a polishing brush having a radius slightly larger than a radius of curvature of an inner surface of an electrode contact side of the electrode holder. A rotary drive unit for rotating the polishing brush by fixing a rotary shaft to the center of the polishing brush, and an engagement sliding mechanism configured between the frame structure and the rotary drive unit. An electrode holder cleaning device comprising a guide part for guiding a brush into the electrode holder, and an elevating and lowering drive part fixed to the frame structure for moving up and down the rotation drive part. 2. The electrode holder cleaning device according to claim 1, wherein a portion other than the open end side of the frame structure is covered with a plate member, and a dust collector for sucking and collecting dust from the inner space through a hole formed in the plate member is added. .