JP2013049065A - Molten steel spill gate opening / closing device - Google Patents

Abstract

A conventional molten steel spill gate opening / closing device can be used as it is without modification, and a large space for the attachment / detachment is unnecessary, and the attachment / detachment operation can be performed safely and easily. An object of the present invention is to provide a detachable carriage for a molten steel spill gate opening / closing device.
A detachable carriage 50 of a molten steel spill gate opening / closing device used when detaching a molten steel spill gate opening / closing device attached to the bottom of a pouring pan, and two detachable carriages provided in the molten steel spill gate opening / closing device 10 are provided. Two suspension arms 52 that are respectively engaged with the suspension members 15 to suspend the molten steel outflow gate opening / closing device, and a height position adjustment mechanism 55 that can adjust the height positions of these suspension arms 52. A holding base 51 for holding the suspension arm 52 and the height position adjusting mechanism 55, and a position adjusting mechanism for moving the holding base 51 up and down, and a work deck for maintaining the pouring pan. A trolley for removing and opening a molten steel spilling gate, which is capable of self-propelled on 6.
[Selection] Figure 1

Description

  The present invention relates to an attachment / detachment carriage for attaching / detaching a molten steel outflow gate opening / closing device installed at the bottom of a casting pot in a pot bottom maintenance work of a casting pot performed in a steelmaking factory.

  A steel outlet formed at the bottom of a pouring ladle (hereinafter referred to as a pouring pan) used in a steelmaking factory is provided with a molten steel outflow gate opening / closing device for adjusting the amount of steel output. This molten steel outflow gate opening / closing device is generally composed of two or three plate bricks having a molten steel spout, and when there are two plate bricks, the lower plate brick slides against the upper plate brick. In the case of three pieces, the intermediate plate brick is slid with respect to the upper and lower plate bricks, thereby changing the positional relationship of the spouts of the respective plate bricks, thereby making it possible to adjust the pouring amount of the molten steel.

  A case where there are two plate bricks will be described with reference to the drawings. FIG. 3 is a cross-sectional view showing a part of the bottom of the pouring pan. The pouring pan 1 has a structure in which a refractory brick 3 is lined with an iron shell 2. Nozzle brick 4 is provided at the bottom of the pouring pan 1 and constitutes a steel outlet 5 for pouring molten steel in the pouring pan into a tundish (not shown). Reference numeral 10 denotes a molten steel outflow gate opening / closing device, which includes an upper nozzle 11, an upper plate brick 12, a lower plate brick 13, a collector nozzle 14, and the like. Here, the upper nozzle 11 and the upper plate brick 12 may be configured separately or as a single unit, and the lower plate brick 13 and the collector nozzle 14 are generally configured as a unit. Then, the lower plate brick 13 is slid (linearly or rotationally moved) with respect to the upper plate brick 12 by a drive mechanism (not shown) to change the area where each upper and lower plate brick wraps, thereby pouring molten steel. The amount can be adjusted. That is, at position A, the spouts of the upper and lower plate bricks communicate with each other, and the molten steel in the pouring pan 1 flows down to the tundish through the steel outlet 5, the upper nozzle 11 and the collector nozzle 14, while at position B Since the upper and lower plate brick spouts do not communicate, the molten steel in the pouring pan does not flow out to the tundish. In the figure, reference numeral 15 denotes a suspension member provided on both sides of the molten steel outflow gate opening / closing device, which will be described later.

  FIG. 4 is a plan view of the pouring pan 1 as viewed from the bottom side, and shows the state of installation of the molten steel outflow gate opening / closing device 10 to the pouring pan 1. Reference numerals 16a and 16b denote positioning blocks for determining the position of the molten steel outflow gate opening / closing device 10 so that the spout of the upper plate brick 12 is located at the position of the steel outlet 5; And the left direction, 16b is for positioning in the up and down direction of the drawing. Reference numeral 17 denotes a bolt seat attached to the molten steel outflow gate opening / closing device 10 (six as many as the positioning blocks in the illustrated example), and the molten steel outflow gate opening / closing operation is performed by bolts 18 and nuts 19 through these bolt seats. The device 10 is fixed to the iron skin 2.

  By the way, the molten steel spill gate opening / closing device opens and closes the gate every time steel is discharged, so the plate bricks are subject to severe wear due to mutual sliding, and the flow path wall of the spout is melted. It is necessary to replace the switchgear with a new one. Hereinafter, this replacement work will be described.

  First, the case where the molten steel outflow gate opening / closing device is removed from the casting pan will be described. As shown in FIG. 5, the pouring pan 1 is turned over by a driving device (not shown) so that the molten steel outflow gate opening / closing device 10 is set up vertically (the rollover is performed so that the left side of FIGS. 3 and 4 is downward). Hereinafter referred to as an upright state.) In this state, the worker on the maintenance work deck 6 adheres to the surface of the nozzle brick 4 (the flow path wall of the molten steel) constituting the steel outlet 5 of the pouring pan 1 and is solidified and remains at a high temperature. Oxygen gas is blown onto the gold to dissolve the metal, and it is dropped and removed (this operation is called oxygen cleaning). Next, the operator operates an overhead crane, a jib hoist or the like (not shown; hereinafter referred to as a jib hoist) to hang the wire rope 20 on the suspension members 15 on both sides of the molten steel outflow gate opening / closing device. At this time, the jib hoist is operated to give the wire rope 20 an initial tension sufficient to support the weight of the molten steel outflow gate opening / closing device 10. Next, the bolt 18 and the nut 19 are loosened, and the total weight of the molten steel outflow gate opening / closing device 10 is deposited on the wire rope 20 and removed from the casting pan 1. The removed molten steel outflow gate opening / closing device 10 operates the jib hoist and conveys it to a predetermined place.

  Next, the case where a molten steel outflow gate opening / closing device is attached to a pouring pan will be described. A wire rope 20 is hung on the suspended member 15 of the recycled or new molten steel spill gate opening / closing device 10 in a predetermined place, and the molten steel spill gate opening / closing device 10 is conveyed to the side of the pouring pan 1 using a jib hoist. While the operator operates the hoist such as the wire rope 20 and the jib hoist on the work deck 6, each bolt seat 17 of the molten steel spill gate opening / closing device 10 is positioned at the position of the corresponding positioning block 16 a, 16 b. The bolt 18 and the nut 19 are fastened to fix the molten steel outflow gate opening / closing device 10 to the casting pan 1 (iron skin 2). Next, the post-casting pan 1 is rotated in the horizontal direction from the upright state, and the pan bottom is positioned downward to prepare for the subsequent casting operation.

  However, since the replacement work of the molten steel spill gate opening / closing device is performed using a jib hoist on the work deck, the work takes a long time and requires a large work load. That is, operate the jib hoist while adjusting the posture of the molten steel spill gate opening / closing device suspended on the wire rope using a chain block or a hand bar (right and left tilt adjustment, swivel adjustment around the vertical axis). , It is necessary to fit in the predetermined position defined by the positioning block, and there are ancillary equipment for the casting pan, ancillary piping or electric cable etc. on and around the work deck, these are wire rope and chain block Interfering, making the above replacement work more difficult.

  In view of this, several inventions have been proposed that aim to reduce the burden on the operator by mechanizing and automating the attaching / detaching operation of the molten steel outflow gate opening / closing device. For example, Patent Document 1 discloses a slide gate attachment / detachment device for attaching / detaching a slide gate for controlling the amount of molten metal dispensed to a lower bottom portion of a molten metal storage pan, which is a lower side portion of the molten metal storage pan. A trolley arranged so as to be able to be moved, a lifting lift that is arranged on the trolley and can be moved up and down with respect to the trolley, and is arranged on the lifting lift in a horizontal direction with respect to the lifting lift. A horizontal movement base arranged so as to be movable, and a fastening member arranged on the horizontal movement base for fastening the slide gate to the lower bottom portion of the molten metal storage pan in the fastening direction or the non-fastening direction There is disclosed a slide gate attaching / detaching device comprising a driving fastening unit.

JP 11-192543 A

  According to the invention described in Patent Document 1 described above, it is possible to automate the installation and removal work of the slide gate cassette (molten steel outflow gate opening / closing device) to the molten metal storage pan (casting pan), or by using a nut or the like. The general slide gate cassette having a simple mounting mechanism can be used as it is without any modification.

  However, the invention described in Patent Document 1 has the following problems. In order for the trolley to travel and position the attachment / detachment device directly below the pouring pan, the worker can place the attachment / detachment device and the operator under the pan at least in the height direction in order to perform horizontal and vertical positioning. In addition, a large space of 2 m is required. Also, when performing oxygen cleaning, it is necessary to roll the pouring pan so that the bottom of the pan faces the operator, so at least 4 m of carriage space is required to retract the detaching device from the swivel range of the pan. There must be.

  In addition, during the oxygen cleaning, a bullion collection box must be installed so that the bullion that has been melted and removed from the nozzle bricks does not interfere with traveling by attaching to the traveling rail of the detachable device. This box must be moved to a place where it does not interfere each time the attachment / detachment device is moved in and out of the casting pan, which increases the work time and the load on the operator. Furthermore, there is a possibility that the metal falls during the operation under the casting pan, and there is a problem that it is not preferable for safety.

  The present invention has been made in view of the above-described circumstances, and can be used as it is without modifying a conventional steel leakage gate opening / closing device of a mounting method using a nut or the like, and can be attached and detached. It is an object of the present invention to provide a detachable carriage for a molten steel outflow gate opening / closing device that does not require a large space and can be attached and detached safely and easily.

The gist of the present invention is as follows.
[1] Molten steel spill gate opening / closing device used when detaching the molten steel spill gate opening / closing device attached to the bottom of the pouring pan, and two hanging members provided on the molten steel spill gate opening / closing device Two suspension arms that can respectively be engaged with each other to suspend the molten steel outflow gate opening / closing device, a height position adjusting mechanism that can adjust the height position of these suspension arms, and the suspension arm, A holding stand for holding the height position adjusting mechanism, and a position adjusting mechanism for moving the holding stand up and down, and traversing on the work deck for maintenance of the pouring pan, Detachable cart for the molten steel spill gate opening and closing device.
[2] The detachable carriage for the molten steel outflow gate opening / closing device according to [1], wherein the height of the two suspension arms can be adjusted independently.
[3] The detachable carriage for the molten steel outflow gate opening / closing device according to [1] or [2], wherein a manual worm jack is used as the height position adjusting mechanism and the position adjusting mechanism.
[4] It is possible to suspend the molten steel outflow gate opening / closing device by providing an arc-shaped notch at the tip of the suspension arm and engaging the hanging member of the molten steel outflow gate opening / closing device in the notch. The detachable carriage of the molten steel outflow gate opening / closing device according to any one of the above [1] to [3].
[5] The detachable carriage for the molten steel outflow gate opening / closing device according to any one of [1] to [4], wherein the position adjustment mechanism includes an elevating mechanism and a traversing mechanism.

  Since the detachable carriage for the molten steel spill gate opening / closing device according to the present invention is used on the work deck for pouring the pouring pan, a large space for moving the detachable carriage becomes unnecessary.

  In addition, since the molten steel spill gate opening / closing device is hung on the two suspension arms, the conventional molten steel spill gate opening / closing device can be used as it is without modification, and it is attached to and detached from the overturned pouring pan. There is no safety problem because of the work.

  Furthermore, the height position of the two suspension arms can be adjusted independently, and a position adjustment mechanism that adjusts the traverse position and the elevation position of the suspension arm is provided, and the removable carriage is self-propelled. Positioning of the suspension arm with respect to the opening / closing device is facilitated, and the working time can be greatly reduced.

It is a side view which shows the attachment or detachment cart of the molten steel outflow gate opening / closing apparatus by this embodiment. It is the schematic for demonstrating the attachment or detachment operation | work of the molten steel outflow gate opening / closing apparatus using the attachment / detachment apparatus of this embodiment. It is sectional drawing which shows the installation condition to the casting pan of molten steel outflow gate opening / closing apparatus. It is the bottom view which looked at the installation condition to the pouring pan of the molten steel outflow gate opening / closing device from the lower side of the pouring pan. It is the schematic for demonstrating the attachment or detachment operation | work of the conventional molten steel outflow gate opening / closing apparatus.

  An embodiment of the present invention will be described with reference to FIGS. 1 and 2. In the following description, the case where the detachable carriage advances in the left direction on the paper surface is defined as forward movement, and the reverse thereof is defined as the backward movement.

  In FIG. 1, 50 is a detachable carriage (hereinafter referred to as a detachable carriage) of a molten steel spill gate opening / closing device 10 used when the molten steel spill gate opening / closing device 10 is removed from or attached to the casting pan 1. It is possible to run on the existing maintenance work deck 6 provided. 10 shown by a virtual line is an upright molten steel outflow gate opening / closing device. Reference numeral 51 denotes a holding base composed of a vertical member 51a and a horizontal member 51b for connecting the vertical member 51a. Each is rotatably supported by a shaft support member 53 attached to the holding base 51 via a shaft 54. At the tip ends of these two suspension arms 52, arc-shaped notches 52a for engaging the suspension member 15 and hanging the molten steel outflow gate opening / closing device 10 are provided. 55 is a height position adjusting mechanism for adjusting the height position of the suspension arm 52, one end of which is rotatably connected to the horizontal member 51b of the holding base 51 via a shaft 56, and the other end is a shaft. The suspension arm 52 is connected to a substantially central portion in the longitudinal direction via the 57. When the height position adjusting mechanism 55 expands and contracts, the suspension arm 52 pivots in the vertical direction about the shaft 54, and the height position of the notch 52 a is set to engage with the suspension member 15. The position can be adjusted. Here, the height positions of the two suspension arms may be adjusted integrally, or the height positions of the two suspension arms may be adjusted independently. In FIG. 1, only the left side of the suspending arm, the height position adjusting mechanism, etc. is shown in the traveling direction of the detachable carriage, but the right side is configured in the same manner, and the two suspending arms are respectively The height position can be adjusted independently.

  A holding base 51 having two suspension arms 52 and a height adjusting mechanism 55 at the front portion is installed on a base plate 58, and a traversing mechanism 59 provided between the holding base 51 and the base plate 58 It can traverse on the base plate 58 (reciprocating in the direction perpendicular to the paper surface). The traversing mechanism 59 may be provided on each of the vertical members 51 a of the holding base 51, but is installed only on either the left or right two vertical members, and the other vertical members are configured to slide on the base plate 58. Also good.

  Reference numeral 60 denotes a lifting frame that can be lifted by a lifting mechanism 61, and a base plate 58 is fixed to the lifting frame 60. That is, the suspension arm 52 held by the holding table 51 can be moved up and down by the lifting frame 60 and the lifting mechanism 61 via the base plate 58 and the like. The base plate 58, the traversing mechanism 59, the lifting frame 60, and the lifting mechanism 61 constitute a position adjusting mechanism. Reference numeral 62 denotes a drive mechanism configured integrally with the elevating mechanism 61. The drive mechanism 62 includes an electric motor, a power transmission shaft, a gear, and the like, and operates a traveling operation bar 65 to rear wheels (drive steering rear wheels). 64 can be driven to move the detachable carriage 50 forward, backward, direction change, braking, and stop. Reference numeral 63 denotes a front wheel attached to the elevating frame 60, which is always urged downward by a spring or the like (not shown), and can be rotated around a shaft 63a so as to follow the elevating operation of the elevating frame. .

  Since the molten steel outflow gate opening / closing device 10 is supported in front of the front wheel 63, a counterweight 66 is installed on the base plate 58 to move the center of gravity of the detachable carriage 50 rearward.

  As the height position adjusting mechanism 55, the traversing mechanism 59, and the elevating mechanism 61, a manual worm jack that can be easily operated with a small force and can perform positioning with high accuracy is preferable. Since each of these mechanisms is for positioning the suspension arm 52 with respect to the molten steel outflow gate opening / closing device 10, a stroke of about ± 100 mm is sufficient.

  The replacement work of the molten steel outflow gate opening / closing device 10 will be described using the detachable carriage 50 of the present embodiment with reference to FIG.

  The pouring pan 1 is turned over to bring the molten steel outflow gate opening / closing device 10 into an upright state. First, oxygen cleaning is performed. Next, the operator operates the traveling operation bar 65 to move the detachable carriage 50 (indicated by a dotted line) at the standby position Y on the work deck 6 to the work position X, that is, the two suspension arms 52 The detachable carriage is advanced so that the intermediate position in the left-right direction is substantially the center position in the width direction of the molten steel outflow gate opening / closing device 10, thereby bringing the hanging arm 52 closer to the hanging member 15 of the molten steel outflow gate opening / closing device 10. The work deck 6 is provided with a forward end stopper 67 and a reverse end stopper 68 so that the detachable carriage 50 does not fall from the work deck.

  Next, the traversing mechanism 59, the elevating mechanism 61 and the height position adjusting mechanism 55 are operated to engage the suspension member 15 of the molten steel outflow gate opening / closing device 10 with the notch 52 a of the suspension arm 52. At this time, if the two suspension arms are configured so that their height positions can be adjusted independently, the height of the two suspension arms can be independently increased even if the molten steel outflow gate opening / closing device is tilted to the left and right. Since the position can be adjusted, it can be reliably engaged, which is more preferable.

  In this state, the operator removes the nut 19 to hold the molten steel outflow gate opening / closing device 10 on the arm 52, and then operates the traveling operation bar 65 to move the detachable carriage 50 backward to the standby position Y. At this standby position Y, the used molten steel outflow gate opening / closing device is removed from the suspension arm by using a jib hoist, and a maintained one or a new one is engaged with the notch 52a of the suspension arm 52 and suspended. By using the height position adjusting mechanism and the position adjusting mechanism of the detachable carriage for this work as well, the position adjustment can be performed accurately and easily. Next, the detachable carriage 50 is driven to advance to the work position X. Next, the elevator mechanism 61, the traversing mechanism 59 and the height adjusting mechanism 55 are operated, and the new molten steel outflow gate opening / closing device 10 is formed in an area defined by the plurality of positioning blocks 16 provided at the bottom of the pouring pan 1. Then, the bolt 18 and the nut 19 are fixed to the bottom of the casting pan via the bolt seat 17, and the detachable carriage 50 is moved backward to stand by at the position Y. The casting pan 1 rolls over so that the bottom portion is positioned below, and prepares for the next operation. In addition, the molten steel outflow gate opening / closing device after use is separately regenerated.

  In the above embodiment, the base plate 58 is fixed to the lift frame 60 and the holding base 51 is attached to the base plate 58 via the traversing mechanism 59 so as to be traversable. However, the lift frame and the base plate are integrated. It may be a base. Further, in order to facilitate positioning of the suspension arm 52 with respect to the molten steel outflow gate opening / closing device 10, an expansion / contraction mechanism that allows the length of the suspension arm 52 itself to be adjusted may be added. Further, instead of the method in which the suspension member 15 is engaged with the notch 52a provided at the tip of the arm 52, a hanging tool such as a chain, belt, sling or wire rope is provided at the tip of the arm and the molten steel flows out. The gate opening / closing device may be suspended from the arm 52.

  An electric worm jack, a fluid pressure actuator, or the like may be used instead of the manual worm jack used in the lifting mechanism or the traversing mechanism. Further, instead of the height position adjustment mechanism, the lifting mechanism, and the traversing mechanism as the positioning device, a positioning device that moves the arm itself back and forth, tilts left and right, or turns may be provided.

  Although the detachable carriage is self-propelled on the work deck, a rail may be provided on the work deck so that it can run on the rail. However, the self-propelled type using no rail is more preferable in terms of work and safety because the work deck is flat. Moreover, you may make it move manually without driving, and the industrial robot which has a suspension arm may be sufficient. In short, any form may be used as long as it can be hung using two hanging arms without remodeling the conventionally used molten steel outflow gate opening / closing device.

  According to the present embodiment, it is possible to perform the attaching / detaching work without interfering with the incidental facilities of the casting pot, the accompanying piping, cables, etc., and the work can be performed on the existing work deck. It is not necessary to add a large space to the casting pan, and it is not necessary to make any modifications to the pouring pan. Furthermore, a conventional steel spill gate opening / closing device can be used as it is. In addition, positioning with respect to the molten steel spill gate opening / closing device in an upright state can be performed accurately and easily using the height adjustment mechanism and position adjustment mechanism, so it is safer compared to conventional work using wire ropes, handrails, etc. And it can work in a short time. In addition, there is no problem with dropping molten metal due to oxygen cleaning.

  In addition, the attachment / detachment device of this embodiment can be easily applied to attachment / detachment work of a molten metal outflow gate opening / closing device of a molten metal container such as a tundish in addition to a pouring pan.

  Using the detachable carriage shown in FIG. 1, the molten steel spill gate opening / closing device was replaced with the molten steel spill gate opening / closing device installed at the bottom of the pouring pan. The lifting mechanism 61 and the traversing mechanism 59 of the detachable carriage used are both manual worm jacks, and the movement distances (strokes) are ± 60 mm and ± 75 mm, respectively, and the height position adjusting mechanism 55 is also constituted by a manual worm jack. The moving distance was set to ± 50 mm in the vertical direction at the position of the notch 52a of the hanging arm. These worm jacks were used so that the trapezoidal screw shaft (output shaft) propelled 1 mm by one rotation of the worm shaft (input shaft) so that the position adjustment was easy. Moreover, since the weight of the molten steel outflow gate opening / closing device is approximately 900 kg, the weight of the counterweight is set to 500 kg.

  When the molten steel spill gate opening / closing device was replaced with the detachable carriage configured as described above, it was possible to work safely in a short time without causing interference with the surrounding incidental equipment, etc. Compared with the replacement work using the machine, the work time could be reduced by about 70%.

1 Casting pan 2 Iron skin 3 Refractory brick 4 Nozzle brick 5 Steel outlet 6 Work deck 10 Molten steel outflow gate opening / closing device 11 Upper nozzle 12 Upper plate brick 13 Lower plate brick 14 Collector nozzle 15 Hanging member 16 (16a, 16b) Positioning Block 17 Bolt seat 18 Bolt 19 Nut 20 Wire rope 50 Detachable carriage 51 Holding base 51a Vertical member 51b Horizontal member 52 Suspension arm 52a Notch 53 Axial support member 54 Axis 55 Height position adjustment mechanism 56, 57 Axis 58 Base plate 59 Traverse mechanism 60 Elevating frame 61 Elevating mechanism 62 Drive mechanism 63 Front wheel 63a Shaft 64 Rear wheel 65 Traveling operation bar 66 Counterweight 67 Forward end stopper 68 Backward end stopper

Claims (5)

A detachable carriage of the molten steel spill gate opening / closing device used when detaching the molten steel spill gate opening / closing device attached to the bottom of the pouring pan,
Two suspension arms that engage with two suspension members provided on the molten steel outflow gate opening / closing device, respectively, and the height of the suspension arms can be adjusted. A height position adjusting mechanism that enables, a holding base that holds the suspension arm and the height position adjusting mechanism, and a position adjusting mechanism that moves the holding base up and down and traverses,
A detachable carriage for a molten steel spill gate opening / closing device, characterized in that it can be self-propelled on a maintenance work deck of the casting pot.   The detachable carriage of the molten steel outflow gate opening / closing device according to claim 1, wherein the height of each of the two suspension arms can be adjusted independently.   The detachable carriage of the molten steel outflow gate opening / closing device according to claim 1 or 2, wherein a manual worm jack is used as the height position adjusting mechanism and the position adjusting mechanism.   An arc-shaped notch is provided at the tip of the suspension arm, and the suspension member of the molten steel outflow gate opening / closing device is engaged with the notch so that the molten steel outflow gate opening / closing device can be suspended. The detachable carriage for the molten steel outflow gate opening / closing device according to any one of claims 1 to 3.   The detachable carriage for the molten steel outflow gate opening / closing device according to any one of claims 1 to 4, wherein the position adjusting mechanism includes an elevating mechanism and a traversing mechanism.

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