JPH0750630B2 - Electrode electrode replenisher - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an electrode joining device for adding electrodes of an electric furnace such as an arc furnace for steelmaking, an electric furnace for ferroalloy, and an electrode heating type ladle heating furnace. is there.

[Prior Art] First, the electric furnace in question will be briefly described.
As an example, Fig. 6 and Fig. 7 show an arc furnace for steelmaking. In the figure, 1 is a furnace body, 2 is a furnace lid, and 3 is an electrode. There are three electrodes 3 on the same circumference, each of which is held by a holder 4. Reference numeral 5 is a device for lifting the electrode, 6 is a furnace lid swivel device, and the furnace lid 2 and the electrode 3 are swung horizontally around the swivel center 7 by the furnace lid swivel device 6, and are denoted by 2 in FIG. It is moved to the position shown by the dotted line. And
At this position, electrode replenishment work is performed. The replenishment is done by screwing a new electrode through the nipple onto the upper end of the graphite electrode in use.

Next, a conventional electrode connecting device will be described.

FIG. 8 shows an overhead crane type electrode extension device. In the present apparatus, the main body 10 of the pedestal is designed to travel on the overhead crane 11, and the new electrode Pa is clamped by the main body 10 of the pedestal to be placed on the electrode Pb in use held by the holder 4. It is the one that is added at the position of.

FIG. 9 shows a swing arm type electrode joint device.
In this device, the body 12 of the stepping device can travel on the swivel arm 13, and the swivel arm 13 can be lifted and lowered by being supported by the fixed post 14. The electrode Pb held by the holder 4 is positioned above the electrode Pb in use and added.

FIG. 10 shows a hoisting and moving type electrode extension device. This device hangs the body 16 of the extension device on the hook 15 of the crane, and the new electrode Pa and the in-use electrode Pb are attached to the body 16 of the extension device.
Clamping devices 17 and 18 for clamping the new electrode are provided, and the clamping device 17 for the new electrode is configured to have a function to clamp the electrode and also to rotate and feed the electrode. It is clamped by 16 and positioned on the electrode Pb in use held by the holder 4, the electrode Pb in use is clamped by the lower clamp device 18, and in this state, the new electrode Pa is clamped by the upper clamp device 17. Is used by screwing it into the electrode Pb during use.

[Problems to be Solved by the Invention] However, the one shown in FIG. 8 requires a space for traveling of the overhead crane 11, and since it is a large-scale facility, it has a drawback that the facility cost is high.

Further, the device shown in FIG. 9 also requires a large facility such as the fixed post 14, and therefore has the same drawbacks as the above, such as a large-scale facility.

In addition, although the equipment itself does not become a large scale in the one shown in FIG. 10, it is hung up by the hook 15 of the crane, so there is shaking at the time of addition, so the work is troublesome and the electrode is impossible. The applied force may damage the electrodes. As described above, each of the conventional electrode extension devices has a problem to be solved.

SUMMARY OF THE INVENTION In consideration of the above points, an object of the present invention is to provide an electrode extension device which is compact, does not occupy a space, is low in equipment cost, and allows electrode addition work to be performed easily and reliably.

[Means for Solving the Problems] In the present invention, three electrodes are held substantially vertically by the electrode holders in a state of being arranged on the same circumference, and the electrode holders are placed directly above the electric furnace. By moving the electrodes sideways, the electrodes are arranged on the same circumference and guided to the electrode addition position set on the side of the electric furnace, and the electrodes are added there. An electrode extension device applied to the above, wherein a swivel axis is provided at a position equidistant a in plan view from the three electrodes that are arranged below the electrode extension position and are guided to the electrode extension position. A swivel device, a swivel connected to the swivel shaft of the swivel device to swivel horizontally, a vertical movement mechanism for moving the swivel up and down, and a distance a above the swivel shaft from the swivel shaft. Placed It is characterized by comprising a clamp device capable of holding a vertical electrode and an electrode rotating device for rotating the electrode held by the clamp device in a horizontal plane.

If the two clamping devices are provided on the swivel base at intervals and the electrode rotating device is provided correspondingly, the clamping device can be effectively used for electrode addition when a water-cooled electrode is used.

[Operation] When performing the electrode replenishment work using the electrode replenishment device having the above-described configuration, the following is performed.

First, the swivel base is swiveled to position the clamp device directly below the electrode holder to be worked. In that state, the holder is lowered, and the in-use electrode held by the holder is clamped by the clamp device.

Then, the holding of the electrode by the holder is released, the opened holder is once raised, and the holder is made to hold the new electrode.
Then, the holder is lowered, the lower end of the new electrode is brought close to the upper end of the in-use electrode gripped by the clamp device, and fixed at a predetermined height.

In that state, the swivel base is raised while rotating the clamp device that grips the in-use electrode, and the upper end of the in-use electrode is screwed into the lower end of the new electrode gripped by the holder to complete the replenishment.

After that, the clamp of the clamp device is released, the holder is raised to a height that does not hinder the turning operation of the device of the present invention, and the work of adding the next electrode is started. In this case, the clamp device can be easily positioned immediately below the electrode to be worked next by simply rotating the swivel base.

Next, a case will be described in which a new electrode is added to an in-use electrode with a water-cooled electrode by an electrode connecting device having two clamp devices provided on a swivel base.

The water-cooled electrode is used by being connected to the upper end of the electrode during use. Therefore, for the new electrode, once remove the water-cooled electrode,
The water-cooled electrode and the graphite electrode in use will be inserted like a pinch.

Therefore, firstly, of the electrodes in use, the water-cooled electrode at the upper end is removed. In that case, first, the swivel base is swung to position the first clamp device directly below the holder.
Then, the holder is lowered in this state, and the in-use electrode gripped by the holder is clamped by the clamp device. Then, the clamp device is rotated in the direction opposite to the screwing direction, the swivel base is lowered, the water-cooling electrode and the graphite electrode therebelow are disconnected, and then the holder is temporarily raised.

On the other hand, during this period, the second clamp device is caused to hold the new electrode so that each clamp device holds the in-use graphite electrode and the new electrode. Then, in this state, the swivel base is swung, and the second clamp device holding the new electrode is positioned so as to be directly below the water cooling electrode held by the holder.

From that state, the holder is lowered to bring the lower end of the water-cooled electrode close to the upper end of the new electrode, and when the distance approaches a predetermined distance, the lowering of the holder is stopped. Then, while rotating the second clamp device, the swivel base is raised to screw the new electrode into the water-cooled electrode.

When this work is completed, the grip of the new electrode by the second clamp device is released, and the holder is raised again. Then, the swivel base is swung to position the first clamp device again directly below the holder, and then the holder is lowered to grasp the lower end of the new electrode connected to the water-cooled electrode by the first clamp device. During use, it is brought close to the upper end of the graphite electrode and fixed at a predetermined height.

In that state, while rotating the in-use graphite electrode gripped by the first clamp device, the swivel base is raised, whereby the upper end of the in-use graphite electrode is screwed into the lower end of the new electrode supported by the holder. Complete replenishment.

After that, the clamp of the first clamp device is released, the holder is raised to a height that does not hinder the turning operation of the device of the present invention, and the work of adding the next electrode is started.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

First, a first embodiment will be described with reference to FIGS. 1 and 2.

FIG. 2 shows a planar arrangement when the electrodes are pivotally moved together with the furnace lid to an electrode adding position which is set to the side of the furnace body (not shown). As shown in this figure, three electrodes P of the electric furnace are on the same circumference F, and each of them is a holder 4 shown in FIG. 1 (only one is shown in FIG. 1 and the others are omitted). It is removably supported by and can be inserted into the electrode through hole formed in the furnace lid 2.

The electrode extension device M is installed below the electrode extension position so as to correspond to the electrode P when moved to the electrode extension position. That is, the electrode extension device M is
It is arranged so as to be located below the moved electrode P, the electrode holder 4, and the furnace lid 2, and is at a point equidistant a from each electrode P at the additional position, that is, the center of the circumference F where the electrode P is located. A turning device 31 is arranged so that the turning shaft 30 is located at O.

In FIG. 1, reference numeral 32 denotes a casing that constitutes the main body of the turning device 31, and the turning device casing 32 is installed on the floor surface. A through hole 33 is formed on the upper surface of the swivel casing 32, and the vertical swivel shaft 30 has the upper end in the through hole 33 at the casing 32.
It is inserted in the state of being put outside. The swivel shaft 30 is supported by a bearing 34 fixed to the inner circumference of the through hole 33 so as to be rotatable and vertically slidable.

A gear 35 is provided at the lower end of the swivel shaft 30 located inside the swivel casing 32, and a swivel drive device 36 is provided on the gear 35.
A gear 38 connected to the shaft 37 of is engaged. Then, by rotating the turning drive device 36, the gear 35,
The swivel shaft 30 is rotated via 38.

Further, a vertical movement mechanism 39 for moving the turning shaft 30 up and down is provided at the lower end of the turning shaft 30. A hydraulic jack or the like is used as the vertical movement mechanism 39. Here, the gear 38 connected to the turning drive device 36 has a length that does not disengage the gear 35 even when the turning shaft 30 is moved up and down.

A swivel base 40 is fixed to the upper end of the swivel shaft 30 protruding from the swivel casing 32. The swivel base 40 has a swivel axis 30.
A cylindrical portion 41 whose axis is oriented vertically is provided at a position separated from the object by a distance a. A lower portion of a cylindrical clamp holding metal fitting 42 into which an electrode can be inserted is vertically inserted into the cylindrical portion 41, and the clamp holding metal fitting 42 is rotatably attached to the swivel base 40 via bearings 43, 43. It is supported.

On the outer periphery of the center of the clamp holding bracket 42 in the height direction, the gear
44 are integrally formed. On the swivel base 40, this gear
A rotation drive device 47 (electrode rotation device) in which a gear 45 meshing with 44 is attached to a drive shaft 46 is fixed, and the clamp holding metal fitting 42 is rotated by operating this rotation drive device 47. .

Further, a plurality of square holes 48 are formed on the upper portion of the clamp holding metal fitting 42 at equal intervals along the circumference of the clamp holding metal fitting 42 in the radial direction of the clamp holding metal fitting 42. A clamp shoe 50 having a guide roller 49 connected to an outer peripheral portion thereof is inserted and arranged so that the holding shoe 42 can slide in the radial direction. These clamp shoes 50 are moved uniformly toward the center of the clamp holding metal fitting 42, thereby reducing the circle surrounded by their inner peripheral surfaces and gripping the electrode P. A heat shield 51 is provided on the inner peripheral surface of the clamp holding metal fitting 42 to prevent radiation heat from the electrode P.

A cylindrical cam member 52 is arranged on the outer periphery of the upper portion of the clamp holding metal fitting 42 so as to be vertically slidable. The cam member 52 has, on its inner peripheral surface, a cam theory 53 that rolls while being in contact with the guide roller 49. Cam surface 53
Is formed by a smooth curve in which the lower portion of the inner peripheral surface of the cam member 52 has a small diameter and the upper portion has a large diameter.

A flange portion 54 is formed at the lower end of the cam member 52, and a U-shaped metal fitting fixed to the rod end of the cam lifting cylinder 55 at the flange portion 54.
56 is engaged. Then, when the cam member 52 is lowered by the cam lifting cylinder 55, the clamp shoe 50 is moved to the cam surface.
The clamp shoe 50 is moved along the radial direction of the clamp holding metal fitting 42 along the line 53 to open the clamp device 57 having the above-mentioned configuration and raise the cam member 52. By moving inward in the radial direction, the clamp device 57 is closed and the electrode is gripped.

In this case, each clamp shoe 50 is always urged by the spring (not shown) in the opening direction, that is, outward, and
The upward movement of 52 causes the clamp shoe 50 to move in the closing direction against the biasing force. In addition,
Reference numeral 58 is a spring for elastically connecting the clamp shoe 50 and the holder 59 of the guide roller 49, and the presence of this spring 58 makes it possible to grip the electrode with a soft and even force in the circumferential direction.

Next, a case where an electrode replenishing operation is performed using the electrode replenishing device having the above structure will be described with reference to FIGS. 1 and 4.

The electrode replenishment is performed according to the following procedure with the furnace lid 2 and the electrode P moved to the electrode replenishment position.

(A) First, the swivel drive device 36 is rotated to horizontally swivel the swivel base 40, and the clamp holding metal fitting 42 and the clamp device 57 are positioned immediately below the electrode holder 4 to be worked.

(B) In that state, the electrode holder 4 is lowered, and the in-use electrode Pb held by the holder 4 is inserted into the clamp holding metal fitting 42. At this time, first, the rod of the cam lift cylinder 43 is retracted to open the clamp device 57,
After inserting the electricity Pb into the clamp holding metal fitting 42, the rod of the cam lifting cylinder 43 is extended to close the clamp device 57 and grasp the electrode Pb.

(C) The holding of the electrode Pb by the holder 4 is released, and the opened holder 4 is once raised.

(D) New electrode suspended from above by a crane
Hold Pa in the holder 4 and lower the holder 4 to create a new electrode.
The lower end of Pa is connected to the in-use electrode Pb held by the clamp device 57.
Close to the upper edge of and fix it at a predetermined height.

(E) In this state, the rotation driving device 47 is operated to rotate the clamp holding metal fitting 42, and the in-use electrode Pb held by the clamp device 57 is rotated. Along with this, the vertical movement mechanism 39 is operated to raise the swivel base 40, thereby raising the in-use electrode Pb, and the upper end of the in-use electrode Pb is fitted to the lower end of the new electrode Pa gripped by the holder 4 at the nipple 61. (Refer to FIG. 1) to screw in and complete addition. In this case, the rotation direction of the rotary drive device 47 and the operation speed of the vertical movement mechanism are, of course, set according to the screw direction of the nipple 61 and the lead.

(F) After that, the cam member 52 is moved by the cam lifting cylinder 55.
Is lowered to release the clamp of the clamp device 57, and the holder 4 is raised to a height that does not hinder the turning operation of the device M of the present invention, and the next electrode replenishing operation is started. In this case, since the clamp device 57 can be positioned directly below the electrode to be worked next by simply turning the swivel base 40, it is possible to easily move to the next electrode adding work. Next, a second embodiment of the present invention will be described with reference to FIG.

The electrode extension device of this embodiment is briefly described as a swivel base.
The size of the swivel base 60 is made larger, and the swivel shaft 30 is connected to the center of the size of the swivel base 60. That is, the swivel base 60 has two cylindrical parts 41 and 41 (see FIG. 1) symmetrically with respect to the swivel axis 30, and the clamp device 57 and the rotary drive device are respectively associated with the cylindrical parts 41 and 41. 47 are provided.

The two clamp devices are the first clamp device 57a and the second clamp device 57a.
As a clamping device 57b of No. 3, a case where a new electrode is added to an in-use electrode with a water-cooled electrode by the electrode connecting device of this embodiment will be described with reference to FIG. here,
A detailed description that duplicates the description of the above embodiment will be omitted.

The water-cooled electrode Pw is used by being connected to the upper end of the electrode Pb during use. Therefore, in the new electrode, the water-cooled electrode Pw is once removed and the water-cooled electrode Pw and the in-use graphite electrode Pc are sandwiched and added. In this case, the electrode extension is
Follow the procedure below.

(A) First, the swivel base 60 is swung to move the first clamp device.
57a is located directly below the holder 4.

(B) In that state, the holder 4 is lowered and the in-use electrode Pb held by the holder 4 is clamped by the first clamp device 57a.

(C) The clamp device 57a is rotated in the direction opposite to the screwing direction, and the swivel base 60 is lowered so that the water cooling electrode Pw
And the graphite electrode Pc below it is disconnected.

(D) The holder 4 is temporarily raised while holding the water-cooled electrode Pw.

(E) Meanwhile, during this period, the new electrode P is attached to the second clamp device 57b.
Hold a. Therefore, at this time, the graphite electrode Pc in use is gripped by the first clamp device 57a, and the new electrode Pa is gripped by the second clamp device 57b.

(F) In this state, the swivel base 60 is swung so that the second clamp device 57b holding the new electrode Pa is positioned so as to be directly below the water cooling electrode Pw held by the holder 4.

(G) From that state, lower the holder 4 to move the water-cooled electrode Pw.
The lower end of the holder 4 is brought close to the upper end of the new electrode Pa, and when it approaches a predetermined distance, the lowering of the holder 4 is stopped.

(H) Next, while rotating the second clamp device 57b, the swivel base 60 is raised to screw the new electrode Pa into the water-cooled electrode Pw.

(I) When the work is finished, the second clamp device 57b
The grip of the new electrode Pa by is released, and the holder 4 is raised again. Then, the new electrode Pa rises together with the holder 4.

(J) Then, the swivel base 60 is swung to position the first clamp device 57a again directly below the holder 4.

(K) Then, the holder 4 is lowered, the new electrode Pa connected to the water-cooled electrode Pw is fixed at a predetermined height, and in that state, the first clamp device 57a that holds the graphite electrode Pe in use is rotated. While rotating, the swivel base 60 is raised, and the upper end of the graphite electrode Pc in use is screwed into the lower end of the new electrode Pa supported by the holder 4 to complete the addition.

(L) After that, the clamp of the first clamp device 57a is released, the holder 4 is raised to a height that does not hinder the turning operation of the device M of the present invention, and the next electrode replenishment work is started.

As described above, in each of the embodiments, the electrode adding work can be performed almost automatically. In particular, when each electrode is replenished one after another, positioning can be performed with respect to each electrode simply by turning the swivel base, so that the work can be very easily performed and the efficiency can be improved.

EFFECTS OF THE INVENTION According to the present invention, the swivel device is installed below the electrode replenishment position, and the swivel axes are set at positions equidistant from the three electrodes, that is, their central positions, and the swivel axes are swung. Since the clamp device is configured to be positioned corresponding to each electrode by rotating the swivel base about the center, the electrode joining device can be installed substantially within the range where the electrodes are located. Therefore, a large facility such as a crane or a fixed post is not required, and an extremely compact and space-saving device can be realized. Therefore, the equipment cost can be reduced. Further, since the position of the clamp device can be aligned only by rotating the turning shaft, the operation can be performed easily and reliably, and automation can be achieved.

If two sets of a clamp device and an electrode rotating device provided on the swivel base are provided, the electrode replenishment work can be automatically performed even when the water-cooled electrode is used. Therefore, the merit of using the water-cooled electrode (reduction of the basic unit of electrode) can be brought out, and the adoption of the water-cooled electrode can be promoted.

[Brief description of drawings]

1 to 4 are for explaining the present invention.
FIG. 1 is a side sectional view of the first embodiment of the present invention, FIG. 2 is a plan view showing the outline of the same embodiment, FIG. 3 is a plan view showing the outline of the second embodiment of the present invention, and FIG. (a)-(f) is a side view showing the procedure when performing electrode addition by the electrode extension device of the said 1st Example, FIGS. 5 (a)-(1) is the electrode extension of the said 2nd Example. It is a side view which shows the procedure at the time of performing electrode addition by a device. Further, FIG. 6 is a side view showing an example of the electric furnace in question here, FIG. 7 is the same plan view, and FIG.
FIG. 10 is a side view showing an example of a conventional electrode connecting device. 4 …… Electrode holder, 30 …… Swivel axis, 31 …… Swivel device, 3
5,38 …… Gear, 36 …… Swivel drive, 39 …… Vertical movement mechanism, 40,60 …… Swivel base, 42 …… Clamp holding metal fittings, 44,45
...... Gear, 47 …… Electrode rotation device, 49 …… Guide roller,
50 …… Clamp shoe, 52 …… Cam member, 53 …… Cam surface, 55 …… Cam lifting cylinder, 57 …… Clamp device, P
…… Electrode, Pa …… New electrode, Pb …… In-use electrode, Pw …… Water-cooled electrode, Pc …… In-use graphite electrode, M …… Electrode extension device.

Claims (2)

[Claims] 1. An electrode holder holds three electrodes in a substantially vertical state in a state where they are arranged on the same circumference.
By moving those electrode holders from the position directly above the electric furnace to the side of the electric furnace, the electrodes are guided to the electrode addition position set on the side of the electric furnace with the electrodes aligned on the same circle. An electrode extension device applied to an electric furnace configured to perform electrode addition, the plan view including three electrodes arranged below the electrode addition position and guided to the electrode addition position. Equidistant at
A swivel device provided with a swivel shaft, a swivel base connected to the swivel shaft of the swivel device to swivel horizontally, a vertical movement mechanism for moving the swivel base up and down, and the swivel on the swivel base. An electric furnace comprising: a clamp device which is arranged at a distance a from the axis and can hold a vertical electrode; and an electrode rotating device which rotates the electrode held by the clamp device in a horizontal plane. Electrode extension device. 2. The clamp device according to claim 1, wherein two clamp devices are provided on a swivel base at intervals, and the electrode rotating device is provided correspondingly thereto. Electrode replenishing device for electric furnace.