JP4960914B2 - Rotating metal melting device current collector - Google Patents

Description

  The present invention relates to a current collector that transmits electric power between a rotating conductive ring of a rotating metal melting apparatus and a fixed brush that is in sliding contact with the conductive ring.

  A rotating metal melting apparatus using electric power is used for melting metal. For example, in electric furnaces, continuous casting tundishes, vacuum melting furnaces, etc., for melting, keeping warm, or refining the charge charged in the metal melting apparatus, the metal melting apparatus is connected with a current collector during operation. To supply power. In addition, when not in operation, power supply is stopped and the metal melting device is tilted to both sides with the erecting state during operation as the boundary, and raw materials are charged into the metal melting device or the melted material is discharged. I do.

  Fig.5 (a) is the schematic which shows the front of the conventional current collector in the rotating melting furnace, (b) is a side view of a current collector.

  In FIG. 5, a trunnion shaft 3 is rotatably supported by a bearing 2 fixed to the bearing support 1. A melting furnace 4 is fixed to one end of the trunnion shaft 3. When the raw material is charged into the melting furnace 4 or the molten product is discharged, the melting furnace 4 is tilted with the upright state during operation as a boundary, and the trunnion shaft 3 also rotates.

  On the outer periphery of the other end of the trunnion shaft 3, a current collector 5 for supplying electric power by supplying current to the melting furnace 4 is disposed. The current collector 5 includes a rotating side conductive ring 6 and a plurality of brushes 7 on which the conductive ring 6 slides.

  The conductive ring 6 is fixed to the other end of the trunnion shaft 3 and rotates together with the trunnion shaft 3 as the melting furnace 4 tilts. The conductive ring 6 is connected to an insulated cable 8 that energizes the melting furnace 4 and is wired in a hollow portion formed inside the trunnion shaft 3.

  The plurality of brushes 7 that slide in contact with the rotating conductive ring 6 are attached to the brush holder 9 at intervals so as to surround the outer periphery of the conductive ring 6. The brush holder 9 is supported by a fixed bracket 11 that is fixed to a fixed base 10.

  Electricity supplied from an external power source is a brush 7, a conductive ring 6 that slides in contact with the brush 7, and an insulated cable 8 connected to the hollow portion of the trunnion shaft 3 connected to the conductive ring 6. And is supplied to the melting furnace 4.

As such a current collector, Patent Document 1 discloses a motor brush holding structure. In Patent Document 1, a brush that moves inwardly by a spring material is applied to the inner peripheral side of an insulating base that is fixedly arranged at the outer peripheral position of a rotor having a commutator (electrode to which the brush contacts). Thus, it is described that the tip portion of the brush is in sliding contact with the commutator in an elastically stable state, and stable electricity can be supplied between the two.
Japanese Patent Laid-Open No. 2002-238204

  However, when the conventional current collector is applied to a rotating melting furnace, there are the following problems.

  When the shaft core of the trunnion shaft 3 is deformed upward (30 to 50 mm) with respect to the reference position of the furnace body of the melting furnace due to long-term operation of the melting furnace, as shown by a one-dot chain line in FIG. When the furnace 1 is tilted, that is, when the trunnion shaft 3 is rotated, the rotating conductive ring 6 (corresponding to the commutator of Patent Document 1) provided on the outer periphery of the end portion of the trunnion shaft 3 also rotates eccentrically. Due to this eccentricity, the conductive ring 6 swings beyond the contraction allowance of the spring holding the brush 7 in contact therewith, and the stationary brush 7 and the rotating conductive ring 6 interfere with each other, The insulator body of the brush holder 9 provided with the brush 7 on the periphery was damaged.

  Accordingly, the present invention provides a current collector that transmits power between a conductive ring fixed to a rotating trunnion shaft of a rotating metal melting apparatus and a fixed brush surrounding the conductive ring. It is an object of the present invention to provide a current collector capable of preventing damage to a brush holder in which a brush is disposed on the inner periphery by following the eccentric movement of a conductive ring.

  The present invention relates to a conductive ring fixed to the outer periphery of a trunnion shaft of a rotating metal melting device and rotating together with the trunnion shaft, and a metal melting device connected to the conductive ring and disposed in the trunnion shaft. In the current collector that transmits electric power between a conductor that energizes the electrode and a brush that surrounds and is in sliding contact with the outer periphery of the conductive ring, the brush holder includes the trunnion shaft And is attached to the fixed base via a tracking mechanism that tracks the eccentric movement of the conductive ring.

  For example, the follower mechanism is configured such that a brush holder is connected to a fixed base by a mechanism in which one end of a link arm is rotatably attached by a pin, and the other end is rotatably attached by a brush holder and a pin. The brush holder can be freely moved up and down and left and right with respect to the eccentric movement.

  In the present invention, since the current collector is provided with a follow-up mechanism, even if the trunnion shaft core provided in the furnace body of the melting furnace is deformed upward by the operation of the melting furnace, When tilting at the time of pouring hot water, the conductive ring on the rotating side and the brush holder on the fixed side having the brush on the inner periphery are swung around in the same manner, so that they can be reliably prevented from interfering with each other. As a result, the brush holder can be prevented from being damaged.

  The present invention is illustrated by examples.

  FIG. 1 is a schematic view showing the front of the current collector of the present invention.

  In FIG. 1, a trunnion shaft 3 is rotatably supported by a bearing 2 fixed to a bearing support 1. A melting furnace 4 is fixed to one end of the trunnion shaft 3. When the raw material is charged into or discharged from the melting furnace 4, the melting furnace 4 is tilted with respect to the upright state during operation of the melting furnace 4, and the trunnion shaft 3 also rotates.

  A current collector 5 is disposed on the outer periphery of the other end of the trunnion shaft 3. The current collector 5 includes a circular conductive ring 6 on the rotating side and a plurality of brushes 7 on which the conductive ring 6 slides. A carbon brush or the like is used for the brush 7.

  The conductive ring 6 is fixed to the other end of the trunnion shaft 3 and rotates together with the trunnion shaft 3 when the melting furnace 4 tilts. The conductive ring 6 is connected to an insulated cable 8 that is a conductor wired in a hollow portion formed inside the trunnion shaft 3. The configuration described above is not different from the conventional example shown in FIG.

  The current collector 5 in the present invention employs a follower mechanism that follows the movement of the conductive ring 6 in order to absorb the swirl of the trunnion shaft 3.

  FIG. 2 is a side view of the current collector of the present invention, and FIG. 3 is a view showing a structure for attaching the brush to the brush holder.

  In FIG. 2, the trunnion shaft 3 that supports the brush holder 9 is rotatably supported with a bearing 13 away from the fixed base 10. The bearing 13 can absorb the rotation between the trunnion shaft 3 and the brush holder support member 12.

  In the brush holder 9, a plurality of brushes 7 on which the rotating conductive ring 6 slides are arranged so as to surround the outer periphery of the conductive ring 6.

  As shown in FIG. 3, the brush 7 that is in sliding contact with the rotating conductive ring 6 is disposed between the brush holder 9 and the conductive ring 6. The brush 7 is pressed against the conductive ring 6 by a presser spring 16, and electrical contact is maintained.

  On the brush holder 9 side of the brush 7, a pin 15 that is inserted into the through hole 14 of the brush holder 9 and is movable in the through hole 14 is provided. A presser spring 16 is passed through the pin 15. The presser spring 16 through which the pin 15 is passed is disposed between the brush holder 9 and the conductive ring 6. The brush 7 is pressed against the conductive ring 6 by the presser spring 16, and the electrical contact with the conductive ring 6 is maintained.

  As shown in FIG. 2, both ends of the link arm 19 are rotatably connected by pins 20 between a bracket 17 fixed to the fixing base 10 and a bracket 18 fixed to the brush holder support member 12 (not shown). Has been. Since the fixed base 10 and the brush holder support member 12 are connected by the link arm 19 via the pins, it is possible to prevent the brush holder 9 on the fixed side from rotating with the tilting of the melting furnace.

  The movement of the sliding device of the present invention will be described.

  FIG. 4 is a view showing the movement of the following mechanism of the brush holder according to the present invention.

  FIG. 4A shows a normal reference position where the melting furnace is in an upright state. In this state, since the trunnion shaft is not eccentric, the brush holder 9 is in the normal reference position, and the link arm 19 is in the vertical state.

  FIG. 4B shows a state in which the axis of the trunnion shaft 3 is deformed upward with respect to the reference position of the furnace body of the melting furnace due to long-term operation of the melting furnace.

  When the axis of the trunnion shaft is decentered upward from the normal reference position in FIG. 4A, the conductive ring 6 also moves upward. As the conductive ring 6 moves upward, the brush holder 9 that surrounds the conductive ring 6 rotates upward (A direction) around the pin 20 of the bracket 18 on the brush holder support member 12 side. Follow the movement of 6. Therefore, even if the conductive ring 6 moves upward due to the eccentricity of the trunnion shaft, the brush holder 9 is not damaged.

  FIG. 4 (c) shows a state where the axis of the trunnion shaft is eccentric to the right side due to the tilting of the melting furnace. When the melting furnace is tilted and the axis of the trunnion shaft is decentered to the right side, the conductive ring 6 is also moved to the right side. As the conductive ring 6 moves, the link arm 19 rotates around the pin 20 of the bracket 17 of the fixed base 10 and moves to the right side (B direction), and the brush holder 9 also moves to the right side to move the conductive ring. Follow the movement of 6. Therefore, even if the conductive ring 6 moves to the right side due to the eccentricity of the trunnion shaft, the brush holder 9 is not damaged.

  FIG. 4 (d) shows a state in which the axis of the trunnion shaft is eccentric downward due to the tilting of the melting furnace. When the melting furnace is tilted and the axis of the trunnion shaft is decentered downward, the conductive ring 6 also moves downward. As the conductive ring 6 moves downward, the brush holder 9 surrounding the conductive ring 6 also rotates around the pin 20 of the bracket 18 of the brush holder support member 12 downward (C direction) to become conductive. Follow the movement of the ring 6. Therefore, even if the conductive ring 6 moves downward due to the eccentricity of the trunnion shaft, the brush holder 9 is not damaged.

  FIG. 4E shows a state in which the axis of the trunnion shaft is eccentric to the left side due to the tilting of the melting furnace. When the melting furnace is tilted and the axis of the trunnion shaft is decentered to the left side, the conductive ring 6 also moves to the left side. As the conductive ring 6 moves, the link arm 19 rotates around the pin 20 of the bracket 17 of the fixed base 10 and moves to the left (D direction), and the brush holder 9 also moves to the left and the conductive ring. Follow the movement of 6. Therefore, even if the conductive ring 6 moves to the left side due to the eccentricity of the trunnion shaft, the brush holder 9 is not damaged.

  As described above, in the current collector of the present invention, the brush holder 9 follows the movement of the conductive ring 6 as the conductive ring 6 moves up and down and left and right due to the eccentricity of the axis of the trunnion shaft. Therefore, the brush holder 9 can be prevented from being damaged.

It is the schematic which shows the front of the current collector of this invention. It is a side view of the current collector of the present invention. It is a figure which shows the attachment structure to the brush holder of the brush of this invention. It is a figure which shows the motion of the following mechanism of the brush holder in this invention. (A) is a schematic front view of a conventional current collector, and (b) is a side view thereof.

Explanation of symbols

1: bearing support base 2: bearing 3: trunnion shaft 4: melting furnace 5: current collector 6: conductive ring 7: brush 8: insulation cable 9: brush holder 10: fixing base 11: fixing bracket 12: brush holder support Member 13: Bearing 14: Through hole 15: Pin 16: Presser spring 17: Bracket 18: Bracket 19: Link arm 20: Pin

Claims (2)

A conductive ring that is fixed to the outer periphery of the trunnion shaft of the rotating metal melting device and rotates with the trunnion shaft, and a conductive material that is connected to the conductive ring and that is disposed in the trunnion shaft and energizes the metal melting device. In a current collector of a rotating metal melting device that transmits electric power between a body and a brush disposed on an inner periphery of a brush holder that surrounds and slides around the outer periphery of the conductive ring,
The brush holder is rotatably supported on the trunnion shaft and is attached to a fixed base via a tracking mechanism that tracks the eccentric movement of the conductive ring. Current collector for metal melting equipment.   The following mechanism is characterized in that a brush holder is connected to a fixed base by a mechanism in which one end of a link arm is rotatably attached by a pin and the other end is rotatably attached by a brush holder and a pin. The current collector for a rotating metal melting apparatus according to claim 1.

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