2022年5月21日星期六

Electric Arc Furnace Refining Furnace Conductive Arm

Electric Arc Furnace Conductive Arm

Electric Arc Furnace Refining Furnace Conductive Arm


The 75-ton horizontal feeding electric arc furnace conductive arm copper-steel composite conductive arm is a rectangular beam structure, which is welded by copper-steel composite plates. Due to the cancellation of the conductive copper tube and many insulation links on the traditional electrode arm, the structure is simplified, the conductive area is increased, the impedance value and maintenance workload can be greatly reduced, and it can be widely used in electric arc furnaces and LF ladle refining furnaces.


Characteristics and Composition of Conductive Arm of Electric Arc Furnace Refining Furnace


(1) The conductive arm is an indispensable part of the electrode lifting mechanism of modern electric arc furnaces. The conductive arm cancels the conductive copper tube structure so that the conductive arm can be used as both a supporting part and a conductive part, which simplifies the short-net structure. 

In terms of the arrangement, the conductive transverse arms of the two sides are symmetrically arranged relative to the conductive transverse arms of the middle phase.

The spacing should be as small as possible under the allowable conditions, which can reduce the size of the furnace structure, but the convenience of installation and adjustment of the column guide wheel must also be considered, so the size cannot be made too small. 

The elevation of the middle phase and the side phase is required according to the arrangement of the short grid, and the value of the elevation dimension is obtained from the calculation of the three-phase balance of the short grid. 

The advantages of using conductive arms are: high power input improves production efficiency; improves impedance and reactance indicators; good arc symmetry and stability, small pitch circle diameter, reduces refractory material consumption; Can be adjusted quickly without causing large system vibration; electrode arms are effectively cooled and insulated; maintenance effort is reduced. 

There are two types of conductive arms: copper-steel composite arms and aluminum alloy arms. Recently, copper-steel composite conductive arms are mostly domestic, and almost all of them are replaced by aluminum alloy arms in Japan. Especially since the DC power supply has no skin effect, the conductive arm of the copper-steel composite plate is not suitable. 

There are many advantages to using aluminum alloy conductive arms in a DC arc furnace. Due to the lightweight of the aluminum alloy arm, the speed and control performance of the electrode lifting and lowering are further improved.

Since vibration attenuation can improve the stability of the arc and increase the arc power, this is the reason for choosing the aluminum alloy arm. 

The conductive arm is an important part of the electric furnace. A good conductive arm should have the advantages of excellent electrical conductivity, good processability, the long service life of each component, and convenient inspection and replacement of wearing parts. The structure of the conductive arm is described by taking the edge-phase conductive arm as an example.


(2) The Composition of the Conductive Arm

The conductive arm is composed of an electrode spray ring, electrode hoop, electrode chuck, electrode soot blowing device, electrode clamping system, arms body, water inlet pipe, return water pipe, oil inlet pipe, Metal hose, water-cooled cable connection plate.


The Conductive Arm Body


(1) The Shape of the Conductive Arm

The conductive arm is generally a rectangular body whose height is greater than its width. 

The cooling methods include hollow interlayer water cooling and integral water cooling, and most of them are made of integral water cooling for the inner and outer interlayers. 

In the early stage of the invention of the conductive cross-arm, the internal and external shapes of the hollow interlayer water-cooled conductive cross-arm were designed to be rectangular. 

Due to the existence of welds, water leakage often occurs under high temperature and strong water pressure, and under the action of frequent up and down irregular movements and vibrations. 

Once internal water leakage occurs, it is not only difficult to find the leaking point, but also very difficult to find and repair the leaking point. 

Moreover, there is a magnetic field inside the cross arm, which also causes the seal of the electrode clamping cylinder installed inside the cross arm to be easily damaged due to overheating due to the presence of eddy currents. 

Later, the material was changed to solve the problems of oil leakage and eddy current. 

Service life is greatly improved and maintenance is reduced. The interior of the overall water-cooled conductive cross-arm is filled with cooling water. 

In order to make the cooling effect better, the cross-arm is made into upper and lower compartments. The cooling water enters from the lower layer and flows out from the upper layer.


(2) The Material of the Conductive Arm Body

The conductive arm material is made of a copper-steel composite plate: the outer layer is the copper plate, the inner layer is a steel plate, and the two are welded together by the explosion. 

The outer part of the conductive arm is usually made into a rectangle, the outer copper plate is used for conduction, and the inner steel plate is used as the support arm. 

Use a copper plate instead of a conductive copper pipe. It can greatly increase the conductive area, greatly reduce the reactance and resistance value, and increase the power by 3%-6%.



The main products of Hani Tech are: electric arc furnace, LF ladle refining furnace, electro slag furnace, submerged arc furnace, metallurgical electric furnace short network system, submerged arc furnace short network system, water-cooled cable, bare copper stranded wire air-cooled cable, rotatable water-cooled cable , high-current copper tube busbar, insulated copper tube busbar, copper-steel composite conductive cross arm, water-cooled compensator, water-cooled furnace cover, water-cooled furnace shell, water-cooled furnace wall, fully enclosed combined handle, direct-cooled forged copper tile, electrode Chuck, electrode holding ring, pressure ring, hydraulic brake, collector ring, conductive element, ladle, tundish, ladle car, cross flat car, steel pouring car, furnace door water-cooled carbon-oxygen gun, furnace wall speed oxygen collector Electric furnace accessories such as guns, ladles, scrap steel tanks, ladle roasters, ladle gantry hooks, water-cooled cable jacket hoses, jacket protection rings and insulating materials.

Hani is the one-stop supplier able to design, manufacture, install and commission your melt shop and hot rolling mill plant from A to Z.


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