JPH06275378A - Electrode connecting device for electric furnace - Google Patents

Abstract

PURPOSE:To shorten an electrode connection time and also facilitate the automation of electrode connection by rotating a rotation mount supporting a screw apparatus and gripping a new electrode by a grip apparatus attached to this rotation mount. CONSTITUTION:A rotation mount 30 is rotated to grip a new electrode 41 on an electrode stand. A screw apparatus 40 is lowered by an elevation drive apparatus 60 to screw a screw fitting in the upper end part of the electrode 41. At that time, the whirl-stop of the electrode 41 is made by a grip apparatus 70. After the screw fitting 42 is screwed, the rotation mount 30 is rotated to move the electrode 41 to the directly upper part of an electrode 9 in use. The swinging of the electrode 41 can be prevented by gripping the electrode 41 by the grip apparatus 70 during this rotation, to perform quick aligning. The electrode 41 together with the apparatus 40 is lowered by the apparatus 60 after the gripping by the apparatus 70 is released in this aligning condition, and the electrode 41 is made screw motion to screw a nipple 41a screwed in the lower end part of the electrode 41 into the connection hole of the electrode 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting device for electrodes used in an electric furnace, and more particularly, in an electric furnace equipped with electrodes for arc heating or resistance heating, a new electrode is used as a consumable electrode during use. The present invention relates to an electrode connecting device used for replenishing.

[0002]

2. Description of the Related Art Generally, in an arc furnace for melting and refining metal materials and melting wastes such as incineration ash, three columns are erected vertically on the side of the furnace body. An electrode gripper is provided at each tip of a cantilever type electrode supporting arm whose base end is fixed to the column to grip the electrodes.

When replenishing electrodes, a new electrode previously suspended by a factory crane is carried to a position above the old electrode in use, and an operator manually tightens the new electrode on the old electrode. However, it requires a great deal of labor, and it is extremely unfavorable to work in a bad environment in which a high temperature causes a lot of dust and is dangerous. Therefore, an electrode connecting device of a type in which a new electrode is rotationally driven by an electric motor or a hydraulic cylinder has been proposed as a means for automating the above-mentioned labor-intensive tightening work. It is carried by the wire rope to a position above the old electrode in a suspended state by a wire rope, so there is a lot of shaking, and it is difficult to automate the centering of the new electrode during connection. Due to the need for monitoring and operation of the crane, the long-time work in the bad environment could not be eliminated. Further, since the electrode supporting arm is driven to rotate laterally of the furnace body together with the furnace lid and the furnace lid supporting arm, the electrode position in use also varies, and a carrying device capable of accurate positioning other than the crane. Therefore, even if the new electrode is carried, it is extremely difficult to automatically center the new electrode with respect to the above-mentioned variation of the old electrode position.

[0004]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems of the prior art, and to quickly center and screw a new electrode to an electrode in use held by an electrode gripper. It is an object of the present invention to provide an electrode connecting device for an electric furnace which can be easily automated.

[0005]

In order to achieve the above-mentioned object, an electric furnace connecting device of the present invention has a predetermined pitch circle centered on an electrode column extending in the vertical direction provided above a furnace lid of the electric furnace. A plurality of electrodes are arranged at a radius, and an electrode gripper that holds these electrodes is supported above and below the electrode strut so as to be movable up and down, above the electrode strut, and a central axis line concentric with the electrode strut. While supporting the swivel freely around, and a screwing device for suspending a screw fitting screwed into the electrode via a universal joint, and a screwing device for screwing the screw fitting, while supporting the swivel up and down, An elevating and lowering drive device for raising and lowering the screwing device by positioning the center of the screw fitting on a swivel orbit having a swivel radius equal to the pitch circle radius about the central axis, and the screw fitting. A gripping device for gripping a side portion of an electrode to be screwed is attached to the swivel base, and an electrode stand for holding an electrode supplied for electrode connection in an upright state is arranged on the swivel track. Is characterized by.

[0006]

In the electric furnace electrode connecting device of the present invention,
By the swivel drive of the swivel base,
It swivels along a circular swirl orbit about a central axis concentric with the electrode column. Since the electrode stand is on the orbit of the screw fitting, the screw fitting can be quickly centered on the new electrode on the electrode stand simply by controlling the turning angle of the swivel base. By gripping the new electrode with the grip device, it is possible to prevent unnecessary rotation of the new electrode when the screw fitting is screwed in.

Further, since the turning radius of the turning orbit of the screw fitting, and thus the new electrode into which the screw fitting is screwed, is equal to the radius of the pitch circle of the electrode in use arranged around the electrode support, the turning base is turned. By simply controlling the angle, the new electrode can be accurately centered directly above the electrode in use. By gripping the new electrode after screwing the screw fittings in the electrode stand with the gripping device, it is possible to prevent shaking of the new electrode during turning movement and at the time of turning stop, and screw in after centering the electrode in use in a short time. The connection can be started quickly.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. First, in FIG. 1 and FIG. 2, 1 is an arc furnace for melting municipal waste incineration ash 2, 3 is a furnace body installed on a foundation 4, 5 is an outlet for molten slag 6, and 7 is a furnace body 3. The covered furnace lid 8 is an electrode through hole for inserting the electrode 9 provided in the furnace lid.

Reference numeral 10 is an electrode supporting device provided above the furnace lid 7, 11 is an electrode support made of steel pipe having an upper end fixed to the floor 12 of the building, and a guide rail extending vertically is provided on the outer peripheral portion thereof. Rule 13 is stuck. Reference numeral 14 denotes an electrode gripper for gripping the electrode 9 in use. The electrode gripper 14 has a clamp shoe 16 driven by an air cylinder 15 and is connected to a power supply source by a cable (not shown). Reference numeral 17 is a guide shoe attached to the side end portion of the electrode gripper 14 via an electrical insulating plate, and the guide shoe 17 is guided up and down along the guide rail 13.

As shown in FIG. 2, the three electrodes 9 are arranged at intervals of 120 degrees on a pitch circle 19 having a pitch circle radius r centered on the center 18 of the electrode column 11. Reference numeral 21 is an elevating and lowering drive machine for vertically moving the electrode 9, which is formed by attaching a winding cylinder 24 for winding a wire rope 23 to the output shaft of a motor 22 mounted on the floor 12. The tip of the wire rope 23 is It is connected to the electrode gripper 14. Reference numeral 25 is a flexible seal device for connecting the lower portion of the electrode gripper 14 and the electrode through hole 8.

On the other hand, 30 is a swivel base provided above the electrode support device 10, swivelable about a central axis 31 concentric with the electrode support 11, and 40 is a screwing device supported on the swivel base 30 so as to be vertically movable. , 70 are gripping devices attached to the swivel base 30. In FIGS. 3 to 5 showing the details of each of these portions, a column 32 is erected and fixed on the upper end of the electrode column 11, and its central axis 31 is aligned with the center of the electrode column 11. The swivel base 30 is formed by fixing a vertical frame 34 to a cylindrical body 33, and the cylindrical body 33 is supported by a column 32 via bearings 35 and 36 so as to be rotatable around a central axis 31. Reference numeral 37 is a drive machine for rotating the swivel base 30,
A pinion 37a is fixed to the output shaft of a vertical motor mounted on an abutment 38 fixed to the electrode support 11. The pinion 37a is a large gear 3 fixed to the lower end of the cylindrical body 33.
It meshes with 3a.

Reference numeral 40 denotes a screwing device for suspending a screw fitting 42 to be screwed into a new electrode 41 via a universal joint 43, which is connected to the universal joint 43 and extends around the lower half of a rotary shaft 44 extending in the vertical direction. A screw 45 is engraved, and this male screw 45 is a box 46.
It is screwed into a nut 47 attached to the lower part of the. The male screw 45 and the nut 47 are the female screw of the connection hole of the electrode 41 screwed with the screw fitting 42, the screw 41 at the lower end of the electrode 41a and the female screw of the connection hole of the electrode 9 screwed with this. And has the same pitch. Then, in order to absorb the manufacturing error of each of the screw portion pitches, as shown in FIG.
, The disc spring 4 is provided between the collar portion 47a of the nut 47 and the collar portion 46a of the box 46 that supports the nut 47.
8, the rotary shaft 44 is elastically supported so that the screw fitting 42 can be smoothly screwed in without excessive force being applied to each part when the screw fitting 42 is rotated.

Reference numeral 49 is a motor which is a driving machine for screw-in driving, and the rotation of its output shaft is transmitted to the rotary shaft 44 through a spline mechanism 50. And box 46 is
A guide rail 39 fixed to the vertical frame 34 and extending in the vertical direction.
Is a guide which is vertically movable along the guide rail 51, and which is fixed to the box 46 and slides along the guide rail 39.

As shown in FIG. 4, the center of the threaded metal fitting 42 in the suspended state, and thus the center of the electrode 41 into which the metal fitting 42 is screwed, is the same as the pitch circle radius r of the electrode 9 in the electrode supporting device 10. The position of the screwing device 40 is set so that the screwing device 40 is located on a circular orbit 52 having the same turning radius R and centered on the central axis 31.

Reference numeral 60 is a lifting drive device for driving the screwing device 40 up and down, 61 is a motor mounted on the top of the vertical frame 34, and 62 is a screw which is connected to the output shaft of this motor and extends vertically. A rod 63 is a nut that is screwed into the screw rod 62, and is connected to an arm 64 protruding from the box 46.

On the other hand, reference numeral 70 is a gripping device for gripping the side portion of the electrode 41. The base portion of a pair of folding arms 71, 71 is rotatably attached to the cylindrical body 33, and the arm is formed. A clamp tool 72 is attached to the tip of 71. 73 and 74
4 is an air motor which is a driving machine for bending the arm 71 to drive it from the gripping position shown by the solid line in FIG. 4 to the folding position shown by the chain line 75, and is a bracket 76 fixed to the cylindrical body 33. A shaft 77 integrated with the first arm 76 is driven by an air motor 73 mounted on the shaft 79, and a shaft 79 integrated with a second arm 78 is driven by the air motor 74 mounted on the first arm 76.
Is going to drive.

Numeral 80 is an electrode stand on a cylindrical container fixed on the floor 12, and a hole 81 into which the lower part of the electrode 41 is fitted.
Is centered on the orbit 52 of the screw fitting 42. Reference numeral 82 denotes an electrode stand 8 from an electrode storage unit (not shown).
An air clamp for suspending and supplying the electrode to part 0,
It is suspended on a monorail type electric chain block (not shown).

In order to connect the electrodes by the electrode connecting device 90 having the above-described structure, the arm 71 of the gripping device 70 is folded as shown by the chain line 75 in FIG. The arm 71 is extended at a position facing the stand 80, and a new electrode 41 on the electrode stand 80 is gripped as indicated by a chain line 91. Then, the screwing device 40 located above the electrode 41 is lowered by the elevating and lowering drive device 60 to bring the screw fitting 42 close to the upper end portion of the electrode, and the screw fitting 42 is screwed by the motor 49 so that the upper end of the electrode 41 is moved. Screw it into the connection hole of the part. At this time, the gripping device 70 prevents the electrode 41 from rotating.

After the screw fitting 42 is screwed in, the gripping device 7
0 is loosened by a small amount, the screwing device 40 is raised by the elevating drive device 60 to swivel the swivel base 30, and the electrode 41 is moved directly to the electrode 9 in use, which is gripped by the electrode gripper 14 of the electrode support device 10. Move to the top. By gripping the electrode 41 by the gripping device 70 during the turning, the swinging of the electrode 41 in a suspended state can be prevented and the centering can be performed quickly. Further, since the electrode 9 only moves up and down at a fixed position with respect to the electrode column 11, there is almost no displacement, and since the turning radius R of the electrode 41 into which the screw fitting 42 is screwed is small, the turning angle of the turning base 30 is controlled. By doing so, the electrode 9 can be stopped immediately above the electrode 9 with high accuracy, and therefore centering can be automatically performed with good accuracy.

After releasing the gripping by the gripping device 70 in this centered state, the electrode 41 is lowered together with the screwing device 40 by the elevating and lowering drive device 60, and the electrode 9 in use which is raised to a predetermined elevated position by the elevating and lowering drive device 21. The electrode 41 is screwed by a screwing device 40 from a position close to the electrode 41a and screwed to the lower end of the electrode 41.
Is screwed into the connection hole of the electrode 9. At this time, both electrodes 9, 4
A slight misalignment of 1 is absorbed by the universal joint 43, and smooth screwing is performed. After that, the electrode 41 is gripped by the electrode gripper 14, and the screw fitting 42 is driven in the opposite direction to the electrode 41 by the screwing device 40.
The connection of one electrode 41 is completed by disconnecting from the connection hole. The electrodes 41 can be similarly connected to the electrodes 9 of other phases by changing the swivel angle of the swivel base 30.

The above steps are easy to automate, and in this case, various sensors can be used to make them fully automatic.
It is also possible to use a semi-automatic system in which a part of the process is remotely controlled in the operation room by using a monitoring device such as ITV.

The present invention is not limited to the above embodiment, and the swivel base 30, the screwing device 40, the elevating and lowering drive device 60, the gripping device 70 and the like may be of a type other than those described above. Further, as the electrode stand 80, for example, an electrode cartridge of a type in which a plurality of electrodes are arranged in an upright state and stacked, and the electrodes are sequentially fed to the position on the orbit 52, is installed on the floor 12. You may use it.

Further, the turning radius R of the screw fitting 42 around the central axis 31 and the pitch circle radius r of the electrode 9 do not necessarily have to be exactly the same values, and the centering action by the universal joint 43 is performed. Therefore, depending on each radius value and the size of the twist of the screwed portion, for example, the difference between both radii R and r may be about 0 to 20 mm, and even if both radii are slightly different, In the invention, they are referred to as equal.

In addition to the arc furnace, the present invention is provided with an electrode similar to that of the arc furnace, and a resistance furnace (arc furnace) such as an electric refining furnace which mainly heats and melts by resistance heating of a material to be heated (arc furnace). (Also called a resistance furnace or buried arc furnace)
Also applies to.

[0025]

As described above, according to the present invention,
By swiveling the swivel supporting the screwing device and gripping the new electrode by the gripping device attached to the swivel, the new electrode on the electrode stand is transferred to the position just above the electrode in use while suppressing shaking. Thus, the centering can be performed quickly and accurately, and then the screw connection can be performed, the electrode connection time can be shortened, and the electrode connection can be easily automated, which contributes to labor saving.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view (cross-sectional view taken along the line BB in FIG. 2) of an electrode connecting device and an electric furnace showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

3 is a detailed vertical cross-sectional view (cross-sectional view taken along the line D-D of FIG. 4) of the electrode connecting device portion of FIG.

4 is a cross-sectional view taken along the line CC of FIG.

5 is an enlarged cross-sectional view of a portion E of FIG.

[Explanation of symbols]

1 ... Arc furnace, 3 ... Furnace body, 7 ... Furnace lid, 9 ... Electrode, 10 ...
Electrode support device, 11 ... Electrode support, 13 ... Guide rail,
14 ... Electrode gripper, 17 ... Guide shoe, 19 ... Pitch circle, 21 ... Lifting drive machine, 30 ... Revolving base, 31 ... Central axis line, 32 ... Strut, 37 ... Drive machine, 39 ... Guide rail,
40 ... Screwing device, 41 ... Electrode, 42 ... Screw fitting, 4
3 ... Universal joint, 44 ... Rotary shaft, 45 ... Male screw, 47 ... Nut, 49 ... Motor, 51 ... Guide shoe, 52 ... Swirl track, 60 ... Elevating drive device, 61 ... Moor
62, screw bar, 63 ... nut, 70 ... gripping device, 7
1 ... Arm, 72 ... Clamping tool, 73 ... Air motor, 7
4 ... Air motor, 80 ... Electrode stand, 90 ... Electrode connection device.

Claims (1)

[Claims] 1. An electrode gripper for arranging a plurality of electrodes with a predetermined pitch circle radius centered on an electrode column extending in a vertical direction provided above a furnace lid of an electric furnace, and holding the electrodes. Above the electrode support of the electrode support device which is supported up and down by the electrode support, a swivel base is supported so as to be rotatable around a central axis line concentric with the electrode support, and a screw metal fitting screwed into the electrode is universal. A screwing device that suspends the screw fitting through a serge joint is supported on the swivel so as to be able to move up and down, and the center of the screw fitting is centered on the central axis, and the turning radius is equal to the pitch circle radius. A lifting drive device for driving the screwing device up and down, and a gripping device for gripping a side portion of the electrode into which the screw fitting is screwed, mounted on the swivel base. An electrode connecting device for an electric furnace, characterized in that an electrode stand for holding an electrode supplied for electrode connection in an upright state is arranged on the turning track.