JP3510079B2 - Electrode holding device in melting furnace - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric melting furnace using an exhausting electrode such as an arc furnace or a plasma furnace, and when connecting a new electrode to an exhausting existing electrode, the existing electrode is placed in a proper posture. The present invention relates to an electrode holding device to be modified.

[0002]

2. Description of the Related Art Economical carbon electrodes are often used in conventional electric furnaces for heating and melting an object by generating an arc or plasma between electrodes or between an electrode and a base metal. Since this carbon electrode is consumed by electric discharge, it is configured to be held by a feeding device and projected into the furnace according to the consumption. Then, when the electrode becomes shorter, for example, by using a connecting device disclosed in Japanese Unexamined Patent Publication No. 5-251179, a female electrode hole formed at the base end portion of the existing electrode is projected at the tip portion of the new electrode. It is continuously operated by fitting the connecting metal fittings.

[0003]

However, the electrode is inserted into the insertion hole of the furnace wall of the furnace body so as to be somewhat interchangeable via a sealing material, and is removably gripped by the gripping tool of the feeding device.
The furnace body of such an electric furnace may be tilted for the purpose of discharging the molten metal and the like inside, and this tilting causes the electrodes to be held by the gripping tool while the furnace body is leveled. The electrodes will remain tilted even after being returned to. Then, when connecting the new electrode by the connection device, the connection metal fitting cannot be fitted to the screw part of the existing electrode, and if the new electrode is forcibly rotated, the screw thread is crushed and the connection becomes impossible. There was a fear.

It is an object of the invention according to claim 1 of the present invention to solve the above problems and to provide an electrode posture holding device capable of properly holding an existing electrode and securely mounting a new electrode. To do.

[0005]

In order to achieve the above object, the invention according to claim 1 of the present invention is to insert a columnar electrode into an electrode insertion hole formed in a furnace wall of an electric furnace so as to be retractable. The base of the electrode is held by the grip of the electrode feeding device that projects the electrode into the furnace according to the wear, and the attitude of the existing electrode when connecting the tip of the new electrode to the base of the worn existing electrode An electrode holding device in a melting furnace for compensating for the above, wherein the gripping tool is composed of a fixed receiving member and a movable pressing member that can freely move toward and away from the fixed receiving member, and between the electrode insertion hole and the gripping tool. A clamp means for holding the electrode by moving the clamp member closer to and away from the fixed receiving member and the movable pressing member in a direction orthogonal to the gripping direction; and urging the clamp member on the center line of the electrode insertion hole and the gripping tool. Biasing means for correction It is provided with a correction clamping device comprising a.

According to the above construction, the electrode insertion hole and the existing electrode held by the gripping tool tend to incline in a direction orthogonal to the gripping direction of the gripping tool, but the clamp means closes the clamp member at the time of connection. , The existing electrode is sandwiched by the clamp member from the direction orthogonal to the gripping direction of the gripping tool which is easy to incline,
By operating the correction biasing means by opening the grasping tool, the inclination of the existing electrode can be eliminated, and the existing electrode can be returned to the proper electrode insertion hole and the center vertical line of the grasping tool. Therefore, the new electrode can be properly connected to the existing electrode, and the connecting screw portion is not crushed.

According to a second aspect of the present invention, a pair of the clamp means having the above-mentioned structure is provided in which the intermediate portions are openably and closably supported on both sides of the existing electrode, and the clamp members are attached to the open side. The clamp arms and the opening / closing actuators connected to the open ends of the clamp arms are connected to the closing biasing means of the clamp arms for correction.

In the above structure, the clamp arms arranged in a V-shape have a biasing force for correction on the closed end side when the clamp position of the existing electrode by the clamp member is on the proper electrode insertion hole and the center line of the gripping tool. The length of the means is minimal.
Therefore, when the clamp position is deviated, the length of the correction biasing means is not minimized, and the contracting force of the correction biasing means is made larger than that of the opening / closing actuator with the grasping tool opened. Thereby, the clamp electrode can be rotated to correct the existing electrode to the proper position.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Here, an embodiment of an electrode attitude holding device for a plasma furnace according to the present invention will be described with reference to FIGS.

As shown in FIG. 5, the furnace body 1 of the plasma furnace
The existing electrode 3 having a cylindrical shape is removably inserted into the electrode insertion hole 2 formed in the top furnace wall 1a of the above, and the existing electrode 3 is protruded into the furnace body 1 in accordance with wear and is held by the electrode feeding device 4. The base 5 of the existing electrode 3 is held by the tool 5. Then, the electrode connecting device 6 for connecting the worn-out base electrode female screw portion 3a of the existing electrode 3 via the male screw portion 3b at the tip of the new electrode 3'is suspended by the crane 7, and the posture of the existing electrode 3 is changed at this time. A correction clamp device 8 for correction is arranged between the electrode insertion hole 2 and the gripper 5. In this plasma furnace, in order to discharge the molten metal inside, the furnace body 1
Is configured to tilt.

As shown in FIG. 3, a sleeve brick 11 is provided in the electrode insertion hole 2, and an electrode seal 13 is provided above the sleeve brick 11 with a seal frame 12 interposed therebetween. Of the electrode 3 is prevented, and the electrode 3 can be sent in according to the consumption.

As shown in FIG. 4, in the electrode feeding device 4, an elevating frame 24 is movably guided by an elevating rail 22 disposed on an elevating mast 21 via a linear bearing 23, and an elevating device (not shown) ascends and descends. Driven. The gripping tool 5 provided at the tip of the elevating frame 24 includes a fixing receiving member 25 fixed to the tip of the elevating frame 24,
A movable pressing member 27 is arranged on the fixed receiving member 25 via a pair of left and right guide rods 26 so as to be able to approach and separate in the front-rear direction, and a gripping cylinder 28 capable of gripping and releasing the existing electrode 3 by retracting the guide rod 26. Composed of and. An arc-shaped gripping recess 25a larger than the radius of the electrode 3 is vertically formed in the fixed receiving member 25, and the movable pressing member 27 faces the gripping recess 25a and has an arc shape larger than the radius of the electrode 3. The pressing recess 27a is formed and the pressing pad 27b is attached. Therefore, when the furnace body 1 is tilted while the existing electrode 3 is held by the grasping tool 5, the existing electrode 3 may be displaced in the left-right direction and tilted. Even if the electrode 3 is restored, the inclination of the electrode 3 does not return.

On the other hand, in the correction clamp device 8, as shown in FIGS. 1 and 3, the support plate 32 is guided up and down by the support bolts 31 provided upright on the seal frame 12 at the four corners,
The support plate 32 is elastically supported by a compression coil spring 33 attached to the support bolt 31 and a double nut 34. An electrode insertion hole 32a is formed in this support plate 32, and a pair of left and right support pins 35 are provided at symmetrical positions that are equidistant from the center position of the electrode insertion hole 32a. A clamp arm 36, which constitutes a clamping means, is rotatably supported on both support pins 35 in the middle portion, and the clamp arm 36 is arranged in a V shape in a plan view. A clamp member 38 is attached to the open side of these clamp arms 36 via a vertical pin 37, and a clamp cylinder 39 that constitutes a clamp means is connected between the open-side tip portions. Further, a tension coil spring 40, which is a correction laying means, is connected between the end portions of the clamp arm 36 on the closed side.

As shown in FIG. 2 (a), the correction clamp device 8 holds the existing electrode 3 by a clamp member 38 and holds it at a proper position on the central vertical line CL of the electrode insertion hole 32a. The length of the tension coil spring 40 is set to the minimum La, and the distance on the tension coil spring 40 side is set to be a short inverted V shape in plan view.

Therefore, as shown in FIG. 2B, when the existing electrode 3 is laterally displaced from the center line CL of the electrode insertion hole 32a, the length of the tension coil spring 40 becomes Lb which is longer than the minimum La. By releasing the gripping tool 5 and making the contracting force of the tension coil spring 40 larger than the contracting force of the clamp cylinder 39, the clamp arm 36 is rotated in the direction of the arrow to move the existing electrode 3 vertically to the center of the electrode insertion hole 32a. The position can be corrected by moving to an appropriate position on the line CL.

Reference numeral 41 denotes a pair of front and rear positioning pins provided upright on the support plate 32. The upper ends of the positioning pins are fitted into the holes 42a of the positioning member 42 of the electrode connecting device 6 to determine the position of the new electrode 3 '. used. Conventionally, this positioning pin is provided only on the gripping tool 5, and the gripping tool 5 is cantilevered by the elevating frame 24, and it is difficult to provide a heavy positioning pin due to the load. By providing the correction clamp device 8, the installation becomes possible.

In the above structure, when the electrode 3 to be used is consumed and shortened, the new electrode 3'is hung by the electrode connecting device 6 via the crane 7 and conveyed above the existing electrode 3. Then, the correction clamp device 8 clamps the existing electrode 3. That is, the clamp arms 38, 38 are closed by the clamp cylinder 39, and the existing electrode 3 is gripped by the clamp member 38 in the front-back direction orthogonal to the gripping direction (horizontal direction) by the gripper 5. Then, at the same time when the gripping tool 5 is released, the contracting force of the clamp cylinder 39 is made smaller than the contracting force of the tension coil spring 40.
The inclination of the existing electrode 3 can be corrected to an appropriate position on the central vertical line CL of the electrode insertion hole 32a. Here, the existing electrode 3 may be gripped again by the gripping tool 5, and the posture of the existing electrode is properly held without being displaced. After positioning the electrode connecting device 6 and the new electrode 3'by the positioning pin 41, the new screw 3'is rotated by fitting the male screw 3b of the new electrode 3'to the female screw 3a of the existing electrode 3. The electrode 3'can be accurately connected to the base end of the existing electrode 3.

FIG. 6 shows another embodiment of the correction clamp device 51. That is, on the elastically supported support plate 52, slide blocks 54A and 54B which are guided by a pair of front and rear guide rods 53A and 53B and can freely move toward and away from each other are arranged on both sides of the existing electrode 3, and the guide rods 53A and 53B.
The correction coil springs 55A and 55B, which are the correction biasing means attached to the slide blocks 54A and 54B,
B is biased toward the existing electrode 3 side. Clamping members 57A and 57B are respectively arranged on these slide blocks 54A and 54B so as to be able to move toward and away from the existing electrodes 3 via clamping cylinders 56A and 56B serving as clamping means.

According to the above configuration, the clamp cylinder 56
By advancing A and 56B, the existing electrodes 3 are clamped by the clamp members 57A and 57B in a direction orthogonal to the holding direction by the gripping tool 5, and the gripping tool 5 is opened, whereby the correction coil springs 55A and 55B act. Thus, it is possible to correct the inclination of the existing electrode 3 via the slide blocks 54A and 54B and correct it to the proper position on the central vertical line CL of the electrode insertion hole 32a.

[0020]

As described above, according to the first aspect of the present invention, the electrode insertion hole and the existing electrode held by the gripping tool are easily inclined in the direction orthogonal to the gripping direction of the gripping tool. However, at the time of connection, the clamp member is closed by the clamp means at the time of connection, the existing electrode is sandwiched by the clamp member from the direction orthogonal to the gripping direction of the gripping tool that is easily inclined, and the gripping tool is opened to thereby provide the biasing means for correction. By making it work, the inclination of the existing electrode can be eliminated, and the existing electrode can be returned to the proper electrode insertion hole and the central vertical line of the gripping tool. Therefore, the new electrode can be properly connected to the existing electrode, and the connecting screw portion is not crushed.

According to the second aspect of the invention, the clamp arms arranged in a V shape are closed when the clamp position of the existing electrode by the clamp member is on the proper electrode insertion hole and the center line of the gripping tool. The length of the correction biasing means on the end side is minimized. Therefore, when the clamp position is deviated, the length of the correction biasing means is not minimized, and the contracting force of the correction biasing means is made larger than that of the opening / closing actuator with the grasping tool opened. Thereby, the clamp electrode can be rotated to correct the existing electrode to the proper position.

[Brief description of drawings]

FIG. 1 is a plan view of a correction clamp device showing an embodiment of an electrode attitude holding device according to the present invention.

FIG. 2A and FIG. 2B are operation explanatory views of the correction clamp device.

FIG. 3 is a front sectional view of the electrode posture maintaining device.

FIG. 4 is a plan sectional view showing an electrode feeding device of the electrode attitude holding device.

FIG. 5 is an overall front view of a plasma furnace facility equipped with the electrode attitude holding device.

FIG. 6 is a plan view of a correction clamp device showing another embodiment of the electrode attitude holding device according to the present invention.

[Explanation of symbols]

1 furnace body 1a Top part furnace wall 2 electrode insertion hole 3,3 'electrode 3a Female screw part 3b Male thread 4 electrode feeder 5 grasping tools 6 electrode connection device 8 Correction clamp device 12 seal frame 25 Fixed receiving member 25a gripping recess 27 Movable holding member 27 Holding recess 28 gripping cylinder 32 Support plate 35 Support pin 36 Clamp arm 38 Clamp member 39 Clamp cylinder 40 tension coil spring 51 Correction clamp device 55A, 55B Correction coil spring 56A, 56B Clamp cylinder 57A, 57B Clamp member

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tsuneharu Sakakibara 5-3-3 Nishikujo 5-chome, Konohana-ku, Osaka City, Osaka Prefecture Hitachi Shipbuilding Co., Ltd. (56) Reference JP-A-9-55289 (JP, A) Kaihei 5-326139 (JP, A) JP 5-251178 (JP, A) JP 54-42054 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F27D 11 /Ten

Claims (2)

(57) [Claims] 1. A cylindrical electrode is inserted into an electrode insertion hole formed in a furnace wall of an electric furnace so that the electrode can be retracted and retracted. An electrode holding device in a melting furnace for correcting the posture of an existing electrode when the tip end of a new electrode is connected to the base end of an exhausted existing electrode that is held at the base end side. And a clamp member that is movable toward and away from the fixed receiving member, and a clamp member is disposed between the electrode insertion hole and the gripping tool in a direction orthogonal to the gripping direction of the fixed receiving member and the movable pressing member. The melting furnace is provided with a correction clamp device including a clamp means for holding the electrodes apart from each other and a correction urging means for urging the clamp member toward the electrode insertion hole and the center line of the gripping tool. In the Holding device. 2. A pair of clamp arms, each of which is arranged in a V-shape and has a clamp member attached to the open side, in which the intermediate portions are openably and closably supported on both sides of an existing electrode, and the clamp arms are opened. An electrode holding device in a melting furnace, comprising an opening / closing actuator connected to an end, and a correction biasing means that is driven to expand and contract is connected to the closing side of the clamp arm.