Classifications

• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
  • H05B7/00—Heating by electric discharge
  • H05B7/02—Details
  • H05B7/10—Mountings, supports, terminals or arrangements for feeding or guiding electrodes

Definitions

• the invention relates to an electrode support device of an electric arc or reduction furnace, in particular for melting steel, with a guide column having a support arm for holding the electrode, which is guided in a guide frame, by front and side guide rollers which are arranged in a rocker arm, vertically is displaceable, mechanical damping elements being provided for damping mechanical vibrations.
• an electrode support arm with a damping element for damping mechanical vibrations is known.
• the damping element is provided between the support arm and the electrode or between the support arm and a point arranged outside the electrode support device.
• the object of the invention is to provide an electrode support device which separates the individual components of the electrode support system in terms of vibrations with simple means and thus reduces the breakage rate of the electrodes, which is usual in the case of the known devices provided with complex damping means.
• the object is achieved in that the mechanical damping elements are arranged between the end guide roller and the guide frame on an electrode support device according to the preamble of claim 1.
• the guide frame is vibrationally separated from the electrode support arm by the arrangement of the damping elements in each rocker bearing the end or side guide rollers.
• the excitation of the guide columns among one another is prevented via the guide frame in furnaces with several electrodes.
• the rocker with the front or side guide roller can be moved transversely to the direction of movement of the guide column along a retaining bolt which is fastened to the guide frame, so that the guide column can be deflected.
• the counter pressure is generated by an abutment which is displaceable on the retaining bolt and which compresses the damping element via a disk arranged in the cylindrical recess. This results in a floating mounting of the guide column, the vibrating mass of the guide frame being decoupled from the vibrating system of the electrodes.
• the high natural damping of the damping element with a damping factor between 0.15 and 0.20 lowers the natural frequency of the overall system and pushes it out of the range of the critical excitation frequency.
• the damping elements have a high restoring force, with the effect that the guide column is supported elastically, but at the same time is centered.
• the pressing force of the front guide rollers on the guide column can be set in a defined manner by the pretensioning of the damping element.
• the progressive characteristic curve of the damping element with the constant elastic stop limit the deflection path of the guide column at high deflection forces, but leave a sufficient damping path free at low forces.
• Fig. 3 shows a section through the guide column along the line A-A
• FIG. 1 shows a greatly simplified view of the electrode carrying device.
• the electrode 1 is moved up and down parallel to the displacement of the guide column 3 via a support arm 2.
• the guide column 3 is moved hydraulically by a regulating cylinder 4 (not shown in more detail).
• the guide column 3 is floatingly supported by front and side guide rollers 6 which are arranged in the rocker arm 5, the rockers 5 being supported in the guide frame 7.
• the guide frame 7 is attached to the portal platform 8.
• FIG. 2 shows the details of the front or side guide roller 6 shown in a greatly simplified manner in FIG. T.
• the front or side guide roller 6 is rotatably mounted on a journal 9 via bearings (not shown here), which is located in the middle the swing arm 5 supports the bore.
• the rocker 5 is slidably arranged on two threaded retaining bolts 10, 10 '.
• the holding bolts 10, 10 ' are welded to plates 11, IT, which are screwed to the guide frame 7 with screws 12, not shown here.
• 7 compensation tabs 13, 13 ' are arranged between the plates 11, IT and the guide frame.
• the damping element 14 is located in a cylindrical recess 15 of the rocker 5, the pressure disc also being in the same recess
• the depth of the cylindrical recess 15, the thickness of the damping element 14 and the thickness of the washer 16 are advantageously selected such that, after the nut 17 has been turned, the outer surface 19 of the washer 16 facing the nut is in line with the outer contour 20 of the rocker 5.
• a lock nut 18 is screwed onto the same retaining bolt 10.
• Figure 3 shows a section along the line AA in Figure 1.
• the three associated guide columns 3, 3 ', 3 11 are in a row.
• S ' ⁇ *' webs 21, 22 are attached to which the side guide rollers 6, 6 'and the end guide rollers 6 "with their running surfaces 23, 23' and 23" are leaning.
• These webs 21, 22 can be easily replaced in the event of wear and secure the guide columns 3, 3 ', 3''against twisting.

Landscapes

• Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• Plasma & Fusion (AREA)
• Furnace Details (AREA)
• Vibration Prevention Devices (AREA)
• Discharge Heating (AREA)
• Vertical, Hearth, Or Arc Furnaces (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6314754

Family Applications (1)

Country Status (7)

Families Citing this family (2)

Citations (4)

Family Cites Families (1)

• 1986
  • 1986-11-26 DE DE19863640298 patent/DE3640298A1/de active Granted
• 1987
  • 1987-10-19 CN CN87106972A patent/CN1015770B/zh not_active Expired
  • 1987-11-10 WO PCT/DE1987/000512 patent/WO1988004128A1/de not_active Ceased
  • 1987-11-10 EP EP87907414A patent/EP0335874A1/de not_active Withdrawn
  • 1987-11-10 BR BR8707895A patent/BR8707895A/pt unknown
  • 1987-11-17 ZA ZA878609A patent/ZA878609B/xx unknown
• 1988
  • 1988-07-25 KR KR1019880700880A patent/KR890700302A/ko not_active Withdrawn

Patent Citations (4)

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