KR100765081B1 - Electric arc holder for electric furnace - Google Patents

Abstract

The present invention relates to an electrode holder in an electric furnace, and more particularly to an improved electrode holder for mounting the jaw to the clamp ring of the electrode and injecting air to more firmly support the electrode.

The present invention is an air line for injecting a predetermined pressure of air into the body; A jaw inserted into the inlet of the body, a plurality of teeth protrude in the front, a protruding cylinder portion in the rear portion, a thread formed therein, and an air hole passing through the front and rear centers; A connecting rod having a front portion connected to the rear portion of the jaw and inserted into the body, and having a rear portion tapered to reduce the diameter toward the rear, and an air through hole formed through the front and rear; A piston inserted into the body, the front portion of which is tapered so as to fit into the tapered portion of the connection rod, and having a through hole formed therein so that air flows in the center thereof; A cover installed at the rear of the piston, sealing a rear surface of the body, and having a through hole for supplying air at the center thereof; And a leaf spring mounted between the cover and the piston. It provides an electrode holder comprising a.

Furnace, Electrode, Holder, Jaw, Clamp, Clamp Ring

Description

Furnace electrode holder {ELECTRIC ARC HOLDER FOR ELECTRIC FURNACE}

1 is a perspective view showing the structure of a conventional electric furnace.

Figure 2 shows a conventional electrode holder, (a) is a perspective view and (b) is a sectional view.

3 is a cross-sectional view showing a state in which the electrode is broken.

Figure 4 shows an electrode holder device according to the present invention, (a) is a perspective view and (b) is a sectional view.

5 is a detailed structural diagram of the electrode holder device according to the present invention, (a) is an exploded view, (b) is an exploded cross-sectional view, (c) is a cross-sectional view of A-A.

6 is an operation state diagram of the electrode holder device according to the present invention, (a) shows the air blowing state of the holder, (b) shows a state in which the holder is in close contact with the electrode.

Explanation of symbols on the main parts of the drawings

100 .... clamp device 150 .... electrode arm

300..electrode 401 .... clamp ring

410..Round Plate 440.Hydraulic Line

460 ... clamp piston 470 ... spring                 

500 Case ... 510

520 .... body 530 .... load

540 ... piston 550 ... leaf spring

The present invention relates to an electrode holder in an electric furnace, and more particularly to an improved electrode holder for mounting the jaw to the clamp ring of the electrode and injecting air to more firmly support the electrode.

In general, the electrode rod 300 used in the electric furnace is a carbon rod, and as shown in FIG. 1, the electrode rod 300 is inserted into the upper center piece 350 of the electric furnace 250. In order to maintain the electrode 300 in a predetermined state, the electrode 300 must be supported by the electrode holder 100 formed at the end of the electrode arm 150.

Figure 2 shows a conventional electrode holder, (a) is a perspective view and (b) is a sectional view. As shown in FIG. 2, the conventional electrode holder is supported by a clamping ring that supports the electrode 300 in a forward and backward direction of a cylinder mounted inside the electrode holder 100. The electrode holder 100 has a round plate 410 mounted therein to clamp the ring 401 to support the electrode 300, and the pad 415 for supplying a current while fixing the electrode 300. Are bolted to both sides. In addition, a clamp piston 460 having a spring 470 mounted inside the electrode holder 100 is connected to and coupled to the clamp ring 401.

When releasing the support of the electrode 300, the hydraulic line installed inside the electrode arm 150 is connected to the hydraulic line 440 of the holder 100, so that oil is clamped to the clamp piston 460 inside the holder 100. ), The clamp piston 460 moves forward, and at the same time, the electrode clamp ring 401 moves forward, thereby releasing the clamping electrode. On the contrary, when clamping the electrode, when the supply of hydraulic pressure is cut off, the spring 470 inside the holder 100 pushes the clamp piston 460 and pulls the clamp ring 401 inward, so that the electrode is a round plate ( 410 is in close contact with the pad 415 is to be clamped.

However, as described above, the clamp ring 401 fixing the electrode bar has a narrow inner round plate 410 and a small contact area with the pad 415, and is affected by severe vibration during arcing of the electric furnace. Sliding electrode occurs. In addition, because of this, the electrode is rubbed with the scrap 260, and in this state, since the arm operates up and down, the electrode is broken. Accordingly, Figure 3 shows a state in which the electrode is broken.

In particular, the arc 150 is generated by contacting the electrode 100 with the broken electrode due to the high current through the arm 150 and the holder 100. Flowing coolant flows out to the inside of the furnace to cool the molten steel and there is a problem that the risk of explosion due to the mixing of the molten steel and water. Due to the occurrence of such equipment accidents, the operation is stopped, productivity is lowered, working at a high temperature implies the risk of safety accidents, there has been a problem that the working time of maintenance is greatly increased.

The present invention is to solve the above problems, in the case of clamping the electrode, by fixing the electrode more securely and firmly, to prevent the breakage of the electrode to prevent equipment accidents, improve productivity, safety accidents of workers The purpose is to provide an electrode holder to prevent the.

As a construction means for achieving the above object, the present invention includes a clamp ring for holding the electrode rod, a pad for fixing the electrode and supplying current, a hydraulic cylinder and a piston inserted into the spring, the cylinder and the piston In the electrode holder device for advancing and clamping the clamp ring and holding or separating the electrode rod, the clamp ring is mounted on the opposite side of the side connected to the piston, the inlet is a quadrilateral, the inside is a circular through hole Forming body; An air line for injecting air of a predetermined pressure into the body; A jaw inserted into the inlet of the body, a plurality of teeth protrude in the front, a protruding cylinder portion in the rear portion, a thread formed therein, and an air hole passing through the front and rear centers; A connecting rod having a front portion connected to the rear portion of the jaw and inserted into the body, and having a rear portion tapered to reduce the diameter toward the rear side, and an air through hole formed through the front and rear; A piston inserted into the body, the front portion of which is tapered so as to fit into the tapered portion of the connection rod, and having a through hole formed therein so that air flows in the center thereof; A cover installed at the rear of the piston, sealing a rear surface of the body, and having a through hole for supplying air at the center thereof; And a leaf spring mounted between the cover and the piston. Including,

The air supplied to the case is ejected through the piston, rod, and jaw mounted in the body, and when the jaw front surface is compressed, the tapered portion of the rod stops the supply of air while blocking the tapered portion of the piston, The electrode holder which presses an electrode by the leaf spring of the back is provided.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Figure 4 shows an electrode holder device according to the present invention, (a) is a perspective view and (b) is a sectional view. 5 is a detailed structural diagram of the electrode holder device according to the present invention, where (a) is an exploded view, (b) is an exploded cross-sectional view, and (c) is a cross-sectional view of an AA line.

4 and 5, the holder of the present invention is fixed to the upper and lower clamp ring 401, the round type clamping device case 500 is an air line 503 is located at the bottom to supply air therein. In addition, the front of the case 500 is formed in a rectangular shape each hole so that a plurality of holder (1) devices are assembled, the round cover 501 is fixed to the back of the case 500 with a bolt 502 It is.

The clamping member fixed to the round case 500 is formed such that a body 520 having a square hole and a circular hole therein is assembled to the case 500. The body 520 has a bolt hole formed in a rectangular flange at the outer side end, the groove is formed in the inner circular hole to assemble the sealing ring 541. At the other end of the body 520, a cover 560 having an air hole formed in the center thereof is fixed by a bolt 561.

The jaw 510, which is in close contact with the electrode, has a front shape having a round shape such as an electrode, and a plurality of teeth protrude. A through hole is formed in the jaw 510 to allow air to pass through the center, and a hole is formed at an oblique angle at an outer lower end of the jaw 510 so that air is ejected downward. One side of the jaw 510 is formed in the shape of a screw to be assembled with the rod 530, the rod 530 is coupled to the jaw is a circular air hole is formed from the end of one side to be connected to the hole of the center Is formed.

The rod 530 has one side, that is, the lower side is formed in the shape of a taper, and the other side is formed with a screw groove is formed to be assembled with the jaw 510. The piston 540 coinciding with the tapered surface of the rod 530 has a tapered hole to be coupled with the rod 530 therein, and an air hole passing through the center is formed to supply air. Outside the piston 540, a sealing ring 541 is assembled to form a seal when the piston moves forward and backward. The spring 550 used to move the piston 540 forward and backward is a circular leaf spring having a hole formed therein to allow air to pass therethrough.

Referring to the operation of the electrode holder according to the present invention as described above with reference to the drawings as follows. 6 is an operation state diagram of the electrode holder device according to the present invention, (a) shows the air blowing state of the holder, (b) shows a state in which the holder is in close contact with the electrode.

In the present invention configured as described above, the case 500 on which the holders 1 are mounted is fixed to the upper and lower portions of the clamp ring 401, and the airline 503 is connected to the case, and air is introduced therein. The air supplied to the case 500 is formed and maintained at a constant pressure, and when it is desired to clamp the electrode, the hydraulic pressure applied to the clamp piston 460 is released, and at the same time, the clamping ring is driven by the force of the spring 470. 401 is pushed in. When the clamp ring 401 is pushed in, the case 500 fixed to the upper and lower parts of the clamp ring 401 is pushed in together. At this time, the air inside the case 500 passes through the center of the spring 550, the piston 540, the rod 530, and the jaws 510 through the hole in the center of the side cover 560 at the rear of the holder 520 of the holder. Done. In addition, by spraying the electrode 300 while the air passes to remove the current of the electrode and to clean the portion in contact with the jaw (510).

When clamping of the electrode starts, the electrode and the jaw 510 are first brought into close contact with each other, the rod 530 connected to the jaw 510 is pushed in, and the rod 530 is pushed in at a predetermined distance and the tapered surface of the rod The piston comes into contact with the taper inside the piston 540 and pushes the piston. When the taper surface of the rod 530 and the piston 540 is in close contact with each other, the supply of air is cut off.

When the jaw 510, the rod 530, and the piston 540 are pushed in at the same time, a repulsion force is generated by the force of the spring 550, and the electrode rod is pushed, thereby performing the electrode clamping operation. Several holder 1 devices are assembled in the holder case 500 of the clamping device, and each device performs clamping so that the electrode rods are accurately and firmly fixed to the pad 415 to prevent slipping of the electrode rods and to prevent damage from being installed. To protect.

On the contrary, when releasing the clamping of the electrode, oil is supplied to the clamp piston 460 by the hydraulic line 440 again, and the supplied hydraulic pressure pushes the clamp piston 460, and at the same time, the clamp ring 401 As it moves forward, the case 500 of the clamping device which is fixed to the clamp ring 401 is moved together. At this time, the leaf spring 550 in the clamping device pushes the rod 530 and the jaw 510 forming one axis with the piston 540, and when the piston 540 touches the inner wall of the body 520, the piston 540 Will stop. At this time, the rod 530 is moved forward by the pressure of the air, separated from the piston 540, the rod 530 and the jaw 510 is advanced by a predetermined distance forward, the rod 530 of the body 520 It stops when it touches the inner wall.

At this time, the air is injected into the gap between the piston 540 and the rod 530, the air is injected through the hole formed as the center of the jaw 510, and cleans the electrode 300, and simultaneously cools the electrode. When the advancement of the clamp ring 401 is completed, the jaw 510 and the electrode are spaced a certain distance, and the operation of replacing the electrode using a hoist (hoist). Air is also injected during the exchange operation of the electrode to cool the pad 415 surface of the clamp device.

According to the present invention as described above, when the electrode is clamped, the plurality of holders are in close contact with each electrode, so that the contact between the electrode and the pad is made firmly, thereby preventing slipping of the electrode, thereby resulting in a loss of the electrode. It is effective to prevent equipment accidents, improve productivity, and prevent workers' safety accidents.

While the invention has been shown and described with respect to particular embodiments, it will be understood that various changes and modifications can be made in the art without departing from the spirit or scope of the invention as set forth in the claims below. It will be appreciated that those skilled in the art can easily know.

Claims (5)

It includes a clamp ring for holding the electrode rod, a pad for fixing the electrode and supplying current, a hydraulic cylinder and a piston with a spring inserted, forward and backward the clamp ring with the cylinder and the piston, and fixed or discharged the electrode rod In the electrode holder device, A body 520 in which the clamp ring is mounted on an opposite side of the side connected to the piston, the inlet is quadrilateral and forms a circular through hole therein; An air line 503 for injecting air of a predetermined pressure into the body; A jaw 510 inserted into the inlet of the body and having a plurality of teeth protruding from the front, a protruding cylindrical portion of the rear portion having a thread, and an air hole penetrating through the front and rear centers thereof; A connecting rod 530 having a front portion connected to the rear portion of the jaw and inserted into the body, and having a rear portion tapered to reduce the diameter toward the rear side, and an air through hole formed through the front and rear; A piston 540 inserted into the body, the front portion of which is tapered to fit with the tapered portion of the connecting rod, and having a through hole formed therein so that air flows in the center thereof; A cover 560 installed at the rear of the piston, sealing a rear surface of the body, and having a through hole for supplying air at the center thereof; And A leaf spring mounted between the cover and the piston; Including, The air supplied to the case is ejected through the piston, rod, and jaw mounted in the body, and when the jaw front surface is compressed, the tapered portion of the rod stops the supply of air while blocking the tapered portion of the piston, Electrode holder which presses electrode rod by the back leaf spring. The method of claim 1, wherein the electrode holder is inserted into a plurality of case holder 500 is hollow inside, a plurality of square holes are formed on the inner surface and the outer surface is blocked, the case is attached to the outer portion of the clamp ring, Electrode holder, characterized in that the air line is connected to the case. The electrode holder according to claim 1, wherein a sealing ring (541) for sealing air is mounted on an outer circumferential surface of the piston. The electrode holder according to claim 1, wherein the rod has at least two through holes formed around the protruding tapered portion, and the through holes merge in the inside and allow air to flow. The electrode holder of claim 2, wherein the case is attached to upper and lower surfaces of an outer portion of the clamp ring.

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