JP4535097B2 - Power supply device for consumable electrode melting furnace - Google Patents

Description

The present invention relates to an energization apparatus in a consumable electrode melting furnace, such as an electroslag remelting furnace and a vacuum arc furnace, which has a consumable electrode suspended from a stinger rod in a conductive crucible.

In the electroslag remelting furnace, a rod-shaped consumable electrode as a melting material is suspended in a steel conductive crucible having a water cooling structure, one end of a power source is connected to the electrode, and the other end is connected to the crucible. This is an apparatus for melting the tip of an electrode by resistance heating when an electric current flows through a slag layer in a crucible (see, for example, Patent Documents 1 and 2). The vacuum arc furnace is a device that keeps the crucible in a vacuum and generates an arc between the lower end of the consumable electrode and the molten metal surface and melts the consumable electrode by arc heating (see, for example, Patent Documents 3 and 4).

Japanese Patent Laid-Open No. 62-156232 JP-A-62-55523 JP 9-31558 A JP 2001-214868 A

Such a consumable electrode melting furnace includes a stinger rod that suspends a consumable electrode and sends electric power thereto. The stinger rod moves up and down together with the consumable electrode by the operation of the lifting device. Therefore, in such a consumable electrode type melting furnace, an energizing device is provided for sending electric power from the power supply device to the stinger rod while sliding on the outer periphery of the stinger rod.

FIG. 11 is an explanatory diagram illustrating a cross-sectional structure of the energization device. As shown in the figure, the energizing device A is arranged so as to cover the outer periphery of the columnar stinger rod B, and is supplied with electric power from an external power supply device E. The energizing device A includes a plurality of holes C formed radially from the axis of the stinger rod B. The hole C abuts against the stinger rod B and sends electric power to the stinger rod B. A contact D is provided. The contact D is urged in the direction of the arrow by a pressing portion such as a spring and abuts against the stinger rod B. That is, the electric power from the external power supply device E is supplied to the stinger rod B through the contact D and further supplied to the consumable electrode. In this way, power is normally supplied to the consumable electrode.

In the energization device A, the gap between the contact D and the hole C in the vertical direction (vertical direction in the rod B axial direction) is as small as possible. This is because the vertical gap between the contact D and the hole C is large, and the contact D rattles due to friction between the stinger rod B and the contact D when the stinger rod B moves up and down. This is to prevent energization from becoming unstable due to poor contact between the child D and the stinger rod B, and the life of the contact D from being shortened.

However, in such a consumable electrode melting furnace, the weight and the center of gravity of the consumable electrode change over time during the melting process, so that the stinger rod B may be tilted when moving up and down. In this case, as described above, since there is almost no gap between the upper and lower surfaces of the contact D and the upper and lower surfaces of the hole C, as shown in FIG. There was a case where a gap d was generated between the stinger rod B and the contact D without tilting so as to follow. As a result, sparks may occur in the gap. Further, the sparker rod B may be damaged by the spark, which may hinder the operation of the melting furnace. Furthermore, each time a spark is generated, it is necessary to check each part of the energizing device A, or to replace the contact D, the stinger rod B, etc., which hinders stable operation of the melting furnace.

An energizing apparatus for a consumable electrode melting furnace according to the present invention is intended to solve the above technical problem, and the energizing apparatus for a consumable electrode melting furnace according to claim 1 is suspended from a stinger rod. A consumable electrode-type melting furnace energizing device in which a consumable electrode is suspended in a conductive crucible so as to be able to move up and down. Power having a current-carrying surface for contact and a contact fitting hole for slidably fitting the contact in the axial direction from the outer periphery of the stinger rod, and power supplied from an external power supply device A contact holder for sending the contactor to the contactor, a pressing portion for pressing the contactor fitted in the contactor fitting hole of the contactor holder against the stinger rod, the contactor and the contactor Between the fitting hole and the steel Provided above and below the Garoddo axis direction, characterized in that and a tilt absorbing portion formed tiltable said contact to follow the slope of the scan Chin guard rods.

Further, the energizing device for the consumable electrode melting furnace according to claim 2 is the energizing device for the consumable electrode melting furnace according to claim 1, wherein the contact includes a pair of contact plates and the pair of contact plates. A spring for urging in a direction away from each other is provided, and the pair of contact plates are brought into contact with the contact holder by urging the spring.

Further, the energizing apparatus for the consumable electrode melting furnace according to claim 3 is the energizing apparatus for the consumable electrode melting furnace according to claim 1 or 2, wherein the tilt absorbing portion includes an upper surface and a lower surface of the contact fitting hole. When the stinger rod vertically formed depending on the gap between the upper and lower surfaces of the contact and the entire surface of the energizing surface abuts, the upper and lower gaps gradually become wider as the distance from the stinger rod increases. It was made to become.

Further, the energizing device for the consumable electrode melting furnace according to claim 4 is the energizing device for the consumable electrode melting furnace according to claim 1, 2 or 3, wherein the pressing portion connects the contactor to the stinger rod axis. It is characterized by being pressed at two places above and below the direction.

According to the present invention, since the tilt absorbing portion that allows tilting of the contact is provided above and below the contact, even if the stinger rod is tilted during the melting process, the tilt absorbing portion is The inclination is absorbed and the contact is tilted following the inclination of the stinger rod. Therefore, the current-carrying surface of the contact always comes into contact with the outer peripheral surface of the stinger rod without any gap, and the occurrence of spark can be prevented, and the consumable electrode melting furnace can be operated stably.

Embodiments of the present invention will be described with reference to the first embodiment shown in FIGS. FIG. 1 is a schematic side view of an electroslag remelting furnace provided with an energization device of the present invention. As shown in the figure, an electroslag remelting furnace 1 includes a conductive crucible 5, a consumable electrode 3 immersed in a slag layer in the crucible 5, a stinger rod 2 for suspending the consumable electrode 3 via a stub 4, a stinger An electrode lifting device 20 that lifts and lowers the rod 2 at a desired speed, an energization device 30 for sending electric power supplied from a power supply device (not shown) to the stinger rod 2, and the like are configured as main members. The electroslag remelting furnace 1 has a three-stage structure, the crucible 5 and the consumable electrode 3 under the lower table 6, the energizing device 30 under the middle table 7, and the upper table 8. The electrode lifting / lowering device 20 is arranged on each of them. The stinger rod 2 is arranged to pass through the middle table 7 and the lower table 6 from directly below the upper table 8, one end of which is the lifting device 20, and the other end is the consumable electrode 3 through the stub 4. Each is connected.

  The crucible 5 is a container that has a substantially cylindrical shape and holds the molten metal. The crucible 5 is connected to an external power supply device (not shown) through a conductive line such as a power supply pole 9 or a water-cooled cable 10. The consumable electrode 3 suspended in the crucible 5 is made of a raw material that is re-dissolved, and has a cylindrical shape.

  The stinger rod 2 is composed of a cylindrical member having conductivity, and is detachably connected to the consumable electrode 3 via the stub 4. That is, the stinger rod 2 and the consumable electrode 3 move up and down together by the operation of the electrode lifting device 20.

  The electrode lifting / lowering device 20 mainly includes an electric motor 21, a speed reducer 22, a screw shaft 23 that passes through the upper table 8 from the speed reducer 22 and is screwed to the stinger rod 2. The screw shaft 23 is screwed into a screw hole (not shown) provided inside the upper end of the stinger rod 2. Further, the rotation of the stinger rod 2 is restricted by fixing the locking plate 24 provided at the end thereof to the slider 25 provided on the guide pole 12 constituting the leg portion of the upper table 8. Therefore, when the electric motor 21 operates, the stinger rod 2 moves up and down.

The energizing device 30 has a ring shape, is suspended from the middle table 7 by the connecting member 13, and is disposed so as to surround the outer periphery of the stinger rod 2. The energizing device 30 includes a surface on which the outer peripheral surface of the stinger rod 2 that moves up and down slides, and the electric power supplied from the external power supply device (not shown) via the water cooling cable 11 is supplied to the stinger rod 2 (final). Is sent to the consumable electrode 3). That is, one end of the external power supply device is connected to the above-described crucible 5, and the other end is connected to the consumable electrode 3 via the energizing device 30 and the stinger rod 2, respectively, and resistance heating of the current flowing through the slag layer in the crucible 5 is performed. Thus, the tip of the consumable electrode 3 is dissolved.

  Note that the middle table 7 and the upper table 8 fixed on the middle table 7 are erected on the lower table 6 via the weighing scale 14 as a whole. That is, the weigh scale 14 includes the consumable electrode 3 and measures all the weight on the lower table 6, and can detect a change in the weight of the consumable electrode 3 during melting. The weigh scale 14 is connected to a control device (not shown) and outputs a weight change to the control device. The control device obtains an appropriate weight reduction rate of the consumable electrode 3 based on the input weight change of the consumable electrode 3 and outputs the command value to the electric motor 21. In this way, the raising and lowering operation of the consumable electrode 3 is performed according to the desired dissolution rate.

Next, the structure of the energization device 30 of the present invention will be described in detail. 2 is a partially cutaway plan view of the energizing device 30, FIG. 3 is a longitudinal sectional view taken along the line AA in FIG. 2, and FIG. 4 is a horizontal sectional view showing a part of FIG. FIG. 5 shows a longitudinal sectional view of a portion corresponding to FIG.

As shown in FIG. 2, the energization device 30 has a ring shape and includes a through hole 34 for inserting the stinger rod 2 at the center thereof. The energization device 30 includes three main members and other members. The three main members are a substantially ring-shaped contact holder 31, a contact 50 that contacts the stinger rod 2, and a pressing portion 70 that presses the contact 50 against the stinger rod 2. The contact 50 and the pressing portion 70 form a pair, and a plurality of these are arranged in the contact holder 31 at equal intervals in the circumferential direction.

First, the structure of the contact holder 31 which is one of the main members of the energization device 30 of the present invention will be described. As shown in FIG. 3, the contact holder 31 includes a contact holder main body 32 having a contact fitting groove 33 into which the contact 50 is fitted, and a contact fitting groove fixed to the lower portion of the contact holder main body 32. The cover includes a lower cover 35 disposed as a cover of 33, a cover 37 that is formed so as to cover the outer periphery of the contact holder body 32 with a predetermined interval, and fixes the pressing portion.

The contact holder main body 32 has a ring-shaped outer shape having a through hole 34 through which the above-described stinger rod 2 is inserted, and is made of a material having good conductivity such as copper. In the lower half of the contact holder body 32, a plurality of contact fitting grooves 33 extending in the radial direction are formed at equal intervals in the circumferential direction from the ring-shaped inner peripheral surface to the outer peripheral surface. . The upper surface of the contact fitting groove 33 is formed as a flat horizontal surface, and both side surfaces are formed as flat vertical surfaces. Further, the width of the contact fitting groove 33 is small so that the contact 50 can easily move in the axial direction of the stinger rod 2, but from the outer peripheral surface side of the contact holder body 32 to the inner peripheral surface side. It is formed to gradually widen. Although not shown, the contact holder main body 32 includes a power supply port for electrical connection to the outside. By connecting the water cooling cable 11 to this power supply port, power is supplied from a power supply device (not shown). Is receiving.

The lower lid 35 is a ring-shaped plate member made of a material such as copper having good conductivity. The outer diameter of the lower lid 35 is larger than the outer diameter of the contact holder main body 32, and a hole 36 for inserting the stinger rod 2 is formed in the center.

The cover 37 is made of a material such as stainless steel, and includes a cylindrical body 38 having a size that covers the outer periphery of the contact holder main body 32 with a predetermined gap, and an upper lid 39 that is welded and fixed to an end surface of the cylindrical body 38. It is configured. The cylindrical body 38 has an outer diameter that is substantially the same as the outer diameter of the lower lid 35, and a height that is lower (substantially half) than the height of the contact holder body 32. The upper lid 39 is a ring-shaped plate member, and has an outer diameter that is substantially the same as the outer diameter of the cylindrical body 38 and an inner diameter that is substantially the same as the outer diameter of the contact holder body 32. Further, overhanging portions 40 for connecting the connecting members 13 are provided at three locations on the outer edge portion of the upper lid 39. A plurality of through holes 41 for fixing the pressing portion 70 horizontally are formed on the circumferential side surface of the cylindrical body 38 at equal intervals in the circumferential direction. One end of the pressing portion 70 fixed to the through hole 41 is configured to abut against the contact 50.

  The contact holder 31 composed of such parts is assembled by fastening the lower lid 35 with a bolt from the lower side of the contact holder main body 32 and fitting and fixing the cover 37 from the upper side of the contact holder main body 32. At that time, the upper lid 39 constituting the cover 37 is fastened to the contact holder main body 32 and the cylindrical body 38 constituting the cover 37 is fastened to the lower lid 35 by bolts.

  As a result of such assembly, the space formed by the contact holder body 32 and the lower lid 35 is made into a contact fitting hole 42 into which the contact 50 is fitted, and the contact 50 is inserted into the contact fitting hole 42. The contact holder 31 is slidably fitted in the axial direction of the stinger rod 2 from the outer peripheral side of the contact holder 31. The connecting member 13 is connected to the overhanging portion 40 of the cover 37 of the assembled contact holder 31, and the connecting member 13 is connected to the middle table 7 via an insulating material (not shown). In this way, the energization device 30 is suspended and fixed to the middle table 7.

In the assembled contact holder 31, a space surrounded by the outer periphery of the contact holder main body 32, the lower lid 35 and the cover 37 is formed. The space is supplied with an inert gas from an inert gas supply source (not shown), and the pressure in the space and the contact fitting hole 42 is maintained at a positive pressure. This prevents dust from entering the space and the contact fitting hole 42 from the outside, and prevents contact of corrosive gas generated during the melting process into the space and the contact fitting hole 42. 50 corrosion is prevented.

Further, as shown in FIG. 3, rubber insulating rings 45 and 46 are provided in the upper end portion of the gap between the contact holder body 32 and the stinger rod 2 and in the gap between the lower lid 35 and the stinger rod 2. . The insulating rings 45 and 46 prevent contact between the stinger rod 2, the contact holder main body 32, and the lower lid 35, and seal the aforementioned space.

Next, the structure of the contact 50 which is one of the main members of the energization device 30 of the present invention will be described. As shown in FIGS. 2 and 4, the contact 50 includes a pair of contact plates 51, 51 disposed side by side with a gap therebetween in the contact fitting hole 42 described above. The spring 58 is disposed in the gap.

The contact plate 51 is a trapezoidal plate-like member made of carbon. The surface on the long side of the two parallel sides constituting the trapezoidal shape is an energization surface 52 that faces the stinger rod 2. As shown in FIG. 4, the energizing surface 52 is formed in a concave shape so as to contact the outer peripheral surface of the columnar stinger rod 2 without a gap.

As shown in FIGS. 3 and 5, the corners at both ends in the vertical direction of the energizing surface 52 are acute angles. Meanwhile, the upper surface 43 and the lower surface 44 of the contact fitting hole 42 are horizontal. Therefore, when the stinger rod 2 suspended vertically and the current-carrying surface 52 come into contact with each other, the gaps 59 and 60 between the contact fitting hole 42 and the upper surface 53 and the lower surface 54 of the contact plate 51 are It gets wider as you leave. The gaps 59 and 60 correspond to a tilt absorbing portion for enabling the contact 50 to tilt. In other words, the tilt absorbing part of the first embodiment forms the upper and lower surfaces of the contact fitting hole 42 in parallel from the inner peripheral surface side to the outer peripheral surface side of the contact holder holder body 32, and the energizing surface 52 has a long side. It is comprised by fitting the trapezoid-shaped contactor board 51 used as follows.

The length in the vertical direction of the energizing surface 52 is slightly shorter (about 1 mm) than the length in the vertical direction of the contact fitting hole 42. By doing so, when the current-carrying surface 52 of the contactor plate 51 is brought into contact with the stinger rod 2, the upper surface 53 and the lower surface 54 of the contactor plate 51 and the contactor mounting hole 42 are disposed in the vicinity of the current-carrying surface 52. The gap between the upper surface 43 and the lower surface 44 is small. Therefore, rattling of the contactor plate 51, that is, the contactor 50 when the stinger rod 2 moves up and down is prevented, and the current flow becomes unstable due to poor contact between the contactor plate 51 and the stinger rod 2, or the contactor plate 51 It is possible to prevent the life of the battery from being shortened.

As shown in FIGS. 3 and 5, two slit-shaped notches 56 are provided on the current-carrying surface 52 side of the contact plate 51. The notch 56 absorbs the thermal expansion of the contactor plate 51 and accommodates dust particles of the contactor plate 51 caused by friction with the stinger rod 2. It prevents sliding failure.

As shown in FIGS. 4 and 5, the pair of contact plates 51, 51 has an annular recess 57 at the center in the width direction and at three positions in the height direction of the opposing surfaces. And the spring 58 housed in the opposing annular recess 57 urges the pair of contact plates 51 and 51 to make good contact with the side surface of the contact fitting hole 42. Thereby, the electric power from the contact holder 31 is sent to the contact plate 51.

Next, the structure of the press part 70 which is one of the main members of the electricity supply apparatus 30 of this invention is demonstrated. As shown in FIGS. 4 and 5, the pressing portion 70 is fixed to the cylindrical body 38 of the contact holder 31, and one end thereof presses the surface 55 on the opposite side of the contact surface 52 of the contact plate 51. The energizing surface 52 is brought into contact with the stinger rod 2.

As shown in FIGS. 4 and 5, the pressing portion 70 is disposed through the support member 71 fitted in the through hole 41 on the peripheral side surface of the cover 37 (cylindrical body 38) and the support member 71. Rod 72, a compression spring 73 disposed around the rod 72, a support member 74 fixed to one end of the rod 72, and a pressing member that is rotatably supported by the support member 74 and presses the contact 50. The pressing member 75, the support member 74, and the rod 72 are integrally configured to receive the restoring force of the compression spring 73 and press the contact 50.

The support member 71 is a columnar member provided with a flange at one end, and is fitted to the cylindrical body 38 by locking the flange to the inner peripheral surface of the cylindrical body 38. A through hole 76 is formed in the shaft core of the support member 71, and an annular groove 77 is provided on the flange side surface so as to be concentric with the through hole 76. A rod 72 is inserted into the through hole 76, and the rod 72 is supported horizontally. A screw portion 78 is provided on a part of the rod 72, and the tip of the screw portion 78 passes through the through hole 76 and protrudes to the outside of the cylindrical body 38.

The support member 74 has an abutting plate 79 fixed to the tip of the rod 72, and an upper piece 80, a lower piece 81, an upper piece 80 and a lower piece 81 extending horizontally from the upper and lower surfaces of the abutting plate 79. The shaft 82 is fixed and provided vertically.

The pressing member 75 has two convex portions 83 and 84 on the side facing the contact plates 51 and 51. Further, the pressing member 75 has a hole, and is rotatably supported by the support member 74 by inserting the shaft 82 through the hole. And the convex parts 83 and 84 are contact | abutted to the surface 55 and 55 on the opposite side to the electricity supply surfaces 52 and 52 of a pair of contactor plates 51 and 51. FIG.

In addition, the pressing member 75 is made of an insulator such as ceramic and prevents the compression spring 73 from being overheated or sparked by cutting off the flow of electricity to the compression spring 73. One end of the compression spring 73 is in contact with the contact plate 79 and the other end is fitted into the annular groove 77. Therefore, the contact 50 is pressed against the stinger rod 2 by pressing from the pressing member 75.

  In addition, when releasing the press to the contact 50 by the press part 70, the nut 85 screwed together with the rod 72 protruded outside from the cylindrical body 38 of the contact holder 31 is adjusted. By tightening the nut 85, the compression spring 73 is contracted and the pressing can be released.

The energizing device 30 composed of these various parts sends the power supplied to the contact holder body 32 from a power supply device (not shown) to the stinger rod 2 via the contact 50.

FIG. 6 is a longitudinal sectional view of the energizing device 30 when the stinger rod 2 is inclined, and shows a cross section taken along the line BB in FIG. In this energizing device 30, when the stinger rod 2 is tilted counterclockwise as shown in FIG. 6, the right contact 50 has a gap 59 between its upper surface 53 and the upper surface 43 of the contact fitting hole 42. Since it becomes wide as it leaves | separates from the stinger rod 2 so that tilting of the contact 50 can be absorbed, it tilts in the counterclockwise direction by the pressing force from the pressing part 70. Similarly, the contact 50 on the left side follows the tilt of the stinger rod 2 and tilts counterclockwise. Therefore, even if the stinger rod 2 is inclined, the entire surface of the energizing surface 52 is always in contact with the stinger rod 2 and there is no gap between the stinger rod 2 and the energizing surface 52, thus preventing the occurrence of sparks. can do. In addition, since the vertical length of the energization surface 52 is slightly shorter (about 1 mm) than the vertical length of the contact fitting hole 42, it prevents the occurrence of poor energization and sparks due to rattling of the contact 50. be able to.

Next, the energization device 130 of the second embodiment shown in FIG. 7 will be described. As shown in the drawing, the energization device 130 of the second embodiment is the same as the first embodiment except for the number of pressing portions 70 as compared to the first embodiment. Therefore, the same or corresponding parts as those in FIG. 3 are denoted by the same reference numerals, and detailed description thereof will be omitted. The same applies to other examples described later.

The energization device 130 according to the second embodiment is configured to press the contact 50 with the two pressing portions 70, and includes the pressing portions 70 that are twice as many as the pressing portions 70 according to the first embodiment. Specifically, a through-hole 41 for attaching the pressing portion 70 is added to the cover 37 of the contact holder 31, and the contact 50 is pressed at two upper and lower positions in the direction of the axis of the stinger rod 2 axis. The two independent pressing portions 70 press the contact 50 so that the contact 50 tilted following the inclination of the stinger rod 2 can be brought into contact with the stinger rod 2 more reliably. .

Next, the energization device 230 of the third embodiment shown in FIG. 8 will be described. As shown in the figure, in the third embodiment, in order to change the shape of the gap between the contact fitting hole 42 and the contact 50 in the first embodiment, a new contact fitting hole 242 and contact 250 are provided. Is provided. The contact fitting hole 242 is formed so that only the upper surface 243 thereof is gradually increased as the distance from the stinger rod 2 is increased, and the contact 250 is formed so that only the upper surface 253 of the contact plate 251 is horizontal. Yes. Also in the third embodiment, as in the first and second embodiments, the clearance between the contact fitting hole 242 and the upper surface 253 and the lower surface 254 of the contact plate 251 becomes wider as the distance from the stinger rod 2 increases. The gap is used as a tilt absorbing portion for allowing the contact 250 to tilt. Also in this embodiment, as in the first and second embodiments, when the stinger rod 2 is tilted, the contact 250 tilts following the tilt of the stinger rod 2 by pressing from the pressing portion 70. To do.

Next, the energization device 330 of the fourth embodiment shown in FIG. 9 will be described. As shown in the figure, the fourth embodiment differs from the first embodiment only in the structure of the contact 50. The contact 350 constituting the energization device 330 of the fourth embodiment has an external shape in which the contact plate 351 connects rectangles to the short sides of the trapezoid. That is, the trapezoidal shape portion is formed so that the gap between the upper surface 353 and the lower surface 354 of the contactor plate 351 and the contactor fitting hole 42 gradually increases from the energizing surface 352 side in contact with the stinger rod 2 toward the pressing portion 70. A rectangular portion is formed from the position spaced a predetermined distance in the direction of the pressing portion 70 so that the gap is a constant interval. The fourth embodiment is different from the structure in which the gap increases as the distance from the stinger rod 2 increases. However, even in such a configuration, the upper and lower gaps of the contactor 350 are used as the tilt absorbing portion as in the first embodiment. It plays a role and has the same effect.

In addition, as shown in the fourth embodiment, when the tilting absorbing portion having a constant gap is formed, when the stinger rod 2 is largely inclined, the rectangular portion of the contact plate 351 is first inserted into the contact fitting. It is also conceivable to come into contact with the mounting hole 42. However, when the rectangular portion of the contactor plate 351 is formed, a tilt absorbing portion that reliably absorbs the tilt of the stinger rod 2 can be provided by considering the maximum tilt angle of the stinger rod 2. Specifically, the maximum inclination angle of the stinger rod 2 is determined by the clearance between the stinger rod 2 and the through hole 34 of the contactor holder body 32 through which the stinger rod 2 is inserted and the elastic modulus of the insulating rings 45 and 46. In consideration, the shape of the rectangular portion of the contactor plate 351 (the width of the gap with the contactor fitting hole 42) may be determined from the obtained maximum inclination angle of the stinger rod 2.

Next, the energization device 430 of the fifth embodiment shown in FIG. 10 will be described. As shown in the figure, the fifth embodiment differs from the first embodiment only in the structure of the contact 50. The contact 450 constituting the energization device 430 of the fifth embodiment is such that the upper surface 453 and the lower surface 454 of the contact plate 451 are formed in an arc shape. In the fifth embodiment, the clearance between the upper surface 453 and the lower surface 454 of the contact plate 451 and the contact fitting hole 42 becomes wider at a portion close to the stinger rod 2 as the distance from the stinger rod 2 increases. However, the portion farther from the stinger rod 2 becomes narrower as the distance from the stinger rod 2 increases. However, as in the fourth embodiment, the gap between the upper and lower ends of the surface 455 opposite to the energizing surface 452 and the contact fitting hole 42 should be set to a distance that takes into account the maximum inclination angle of the stinger rod 2. For example, this gap plays a role as a tilt absorbing portion, and has the same effect as the first embodiment.

The present invention is not limited to the above example, and the shape and material of the contact holder 31 may be other than the above, and the pressing portion 70 uses a fluid pressure cylinder such as a hydraulic cylinder, a power cylinder, or the like. You may have done. Further, the shape of the surface 55 opposite to the energizing surface is not limited to the above example, and various changes may be made such as making it concave.

The schematic side view of an electroslag remelting furnace. The partial notch top view of an electricity supply apparatus. The longitudinal cross-sectional view in the AA cross section of FIG. The horizontal sectional view which expands and shows a part of FIG. The longitudinal cross-sectional view of the part corresponding to FIG. In 1st Example, the longitudinal cross-sectional view of an electricity supply apparatus when a stinger rod inclines. The longitudinal cross-sectional view of the electricity supply apparatus in 2nd Example. The longitudinal cross-sectional view of the electricity supply apparatus in 3rd Example. The longitudinal cross-sectional view of the electricity supply apparatus in 4th Example. The longitudinal cross-sectional view of the electricity supply apparatus in 5th Example. Explanatory drawing explaining the cross-section of an electricity supply apparatus. The longitudinal cross-sectional view when a stinger rod inclines in the conventional electricity supply apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Electroslag remelting furnace, 2 ... Stinger rod, 3 ... Consumable electrode, 5 ... Crucible, 20 ... Electrode raising / lowering device, 30 ... Current supply device, 31 ... Contact holder, 32 ... Contact holder main body, 35 ... Lower cover, 37 ... Cover, 42 ... Contact fitting hole, 50 ... Contact, 51 ... Contact plate , 52... Energized surface, 58... Spring, 59... Gap (tilt absorbing part), 60 .. gap (tilt absorbing part), 70.

Claims (4)

A consumable electrode-type melting furnace energization device in which a consumable electrode suspended from a stinger rod is suspended in a conductive crucible so as to be raised and lowered.
A plurality of contacts arranged around the axis of the stinger rod, and a contact having an energization surface for energizing the stinger rod;
A contact holder that has a contact fitting hole for slidably fitting the contact from the outer periphery of the stinger rod in the axial direction, and that sends electric power supplied from an external power supply device to the contact; ,
A pressing portion that presses the contactor fitted in the contactor fitting hole of the contactor holder against the stinger rod;
Between the contact and the contact fitting hole, provided above and below in the direction of the axis of the stinger rod, the contact can be tilted following the inclination of the stinger rod. A tilt absorber,
A current-carrying apparatus for a consumable electrode melting furnace. The contact is a pair of contact plates,
A spring for urging the pair of contact plates away from each other;
The energizing device for a consumable electrode melting furnace according to claim 1, wherein the pair of contact plates are brought into contact with the contact holder by biasing of the spring. The tilt absorbing portion is formed by a gap between the upper and lower surfaces of the contact fitting hole and the upper and lower surfaces of the contact,
3. The upper and lower gaps gradually become wider with increasing distance from the stinger rod when the stinger rod suspended vertically and the entire surface of the energizing surface come into contact with each other. An energizing device for a consumable electrode melting furnace as described in 1. 4. The consumable electrode melting furnace according to claim 1, wherein the pressing portion is configured to press the contactor at two upper and lower positions in the axial direction of the stinger rod. 5. Energizing device.

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