JP2001001132A - Replacing device for submerged nozzle in continuous casting equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To safely and promptly replace a submerged nozzle offline by providing submerged nozzle ascending/descending devices on a traveling dolly movable forward and backward to the submerged nozzle on a tundish bottom and on a laterally moving dolly movable in the right-angled direction to the traveling direction of the dolly, and providing a bolt turning device on the laterally moving dolly, which makes a rotary system nozzle holding arm move up and down. SOLUTION: For replacing a submerged nozzle 7, a traveling dolly 1 is stopped in the mounting position of the submerged nozzle 7, an ascending/ descending rest 3 on a laterally movable rest 2 is elevated, and the socket 6-4 of a bolt turning device 6 is fit to the nut 13-2 of a submerged nozzle holding device 13. By rotating reversely a bolt 13-2 with nut by a motor 6-2, and by lowering a rotary system nozzle holding arm 12, the submerged nozzle 7 is detached from a sliding nozzle 11 and the traveling dolly 1 is retreated to a prescribed standby position. After removing an old submerged nozzle 7 from a replacing device, a new submerged nozzle 7 is set by making an arm 7-1a engage with a nozzle hanger arm 5-2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for off-line replacement of a submerged nozzle mounted on the bottom of a tundish of a continuous casting facility.

[0002]

2. Description of the Related Art A tundish in a continuous casting facility is constructed so that refractory lining is applied to the inner surface of a steel shell to receive molten steel. Is equipped with a sliding nozzle that opens and closes and mounts an immersion nozzle that supplies molten steel to the mold. The immersion nozzle attached to this sliding nozzle is used to prevent the molten steel stream from being exposed and oxidized during casting.When the molten steel is injected into the mold, its lower end is immersed in the molten steel in the mold. Is done. In this way, the immersion nozzle flows molten steel inside, and the lower end is damaged or closed from the place where it is used by immersing it in the molten steel in the mold,
Requires frequent replacement.

Various devices have been conventionally proposed as devices for replacing the immersion nozzle. For example, JP-A-9-108
No. 825 discloses a tundish 1 as shown in FIG.
A truck 21 disposed so as to be able to move forward and backward toward a pair of left and right nozzle holding arms 30 provided at the bottom, a lifting / lowering / turning device 22 installed on the truck 21,
A transfer main body 25 and a front end of the transfer main body 25 extend parallel to the front end of the transfer main body 25 at the distal end of the telescopic arm 23 of a transfer device 24 which is mounted on a turning device and includes a telescopic arm 23 which can be telescopically extended by a cylinder unit or the like. A pair of left and right hanger arms 26, an air clamp device 27 detachably attached to the lower part of the delivery body 25, a shielding plate 28 detachably attached to the rear of the hanger arm, and a rear bottom surface of the hanger arm 26 A device for handling an immersion nozzle, which is constituted by a nozzle locking plate 29 that is fixed to the nozzle and locks the neck of the immersion nozzle 7 has been proposed.

When the immersion nozzle is replaced by this handling device, the tundish 1 must be placed online.
0 The used immersion nozzle 7 held by the nozzle holding arm 30 provided at the bottom is received by the hanger arm 26 of the delivery body 25, and then the transfer device 24 is driven to move the handling device away from the tundish 10 by a predetermined distance. To dispose of the used immersion nozzle, and then attach a new immersion nozzle to the hanger arm 26 of the empty handling device and move it to the tundish side again to operate the handling device at the predetermined position. Then, a new immersion nozzle is attached to the nozzle holding arm 30.

[0005]

However, in the case of the above immersion nozzle replacement device, the immersion nozzle replacement operation is performed online (at the casting position).
There are problems described below. Since the moving range of the immersion nozzle changing device is large, the working space for the operator who performs the casting operation is not sufficiently secured, and there is a problem in safety. Since the casting position is at a high temperature, troubles such as burning of various detectors and electric wirings of the immersion nozzle changing device due to radiant heat frequently occur. When repairing the immersion nozzle replacement device, there is a problem in safety because the working place is under high temperature, and the repair must be performed after stopping the operation, which is one of the causes of a decrease in the operation rate.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide an immersion nozzle exchanging apparatus capable of easily, quickly and safely exchanging immersion nozzles off-line. is there.

[0007]

SUMMARY OF THE INVENTION An immersion nozzle changing apparatus according to the present invention is an apparatus for exchanging an immersion nozzle mounted on the bottom of a tundish of a continuous casting facility offline, by rotating a bolt on the bottom of the tundish. The immersion nozzle is held by a pair of left and right rotating nozzle holding arms mounted so as to rotate vertically about a trunnion shaft as a fulcrum via a cam plate supported so as to be able to move back and forth, and is used as a transfer means such as a moving carriage. In an immersion nozzle replacement device of a type in which the immersion nozzle is replaced by an installed immersion nozzle attaching / detaching device, the immersion nozzle is mounted on a traveling vehicle arranged to be able to move forward and backward toward the immersion nozzle at the bottom of the tundish. Nozzle elevating and lowering comprising a hydraulic cylinder that is provided with a horizontal moving table that can move in the direction perpendicular to the running direction and that grips the immersion nozzle and moves it up and down A bolt rotating device with a nut for rotating a support bolt for rotating the rotary nozzle holding arm in the vertical direction is provided on an elevating table provided so as to be able to move up and down on the horizontal moving table. It is characterized by being provided so as to be able to move back and forth in the same direction as the bogie.

[0008] A pair of left and right rotating nozzle holding arms mounted so as to rotate vertically about a trunnion shaft as a fulcrum via a cam plate supported so as to be able to move back and forth by rotation of a bolt attached to the bottom of the tundish. Is known. However, since the rotation of the bolt for rotating the nozzle holding arm in the vertical direction is usually performed manually, the mounting and dismounting of the immersion nozzle requires a lot of labor and time, and is not only inefficient, but also Especially when working online (casting position), it is extremely dangerous and there is also a problem in terms of safety.

Therefore, in order to solve such a problem, the present invention makes it possible to carry out the immersion nozzle replacement operation offline, and to provide a motor for rotating the bolt, that is, a motor for rotating the pair of left and right rotating nozzle holding arms. Automated by adopting such power. That is, in the present invention, a pair of left and right rotary nozzle holding arms are rotated by the power of a motor, air, or the like, using an electric impact wrench or a pneumatic bolt rotating device with a nut. This makes it possible to save labor for attaching and detaching the immersion nozzle, and to easily, quickly and safely replace the immersion nozzle. The nut-rotating device is not particularly limited, but a socket is attached to the tip of a rotating rod driven by the power of a motor or the like to fit the shape of the nut of the bolt, and the socket is attached to and detached from the nut. It is possible to adopt an apparatus which is fitted and rotated as much as possible.

The traveling vehicle in the present invention is of a self-propelled type,
It is arranged so that it can move forward and backward by a predetermined stroke by a drive motor installed on the carriage. The nozzle elevating device and the bolt rotating device mounted on the traveling trolley are provided on the traveling trolley so as to be movable in a direction perpendicular to the moving direction of the trolley so that the nozzle elevating device can be easily and quickly positioned at a predetermined position. The bolt rotating device is installed on a lifting platform that can be raised and lowered on the horizontal traveling platform, and in the same direction as the traveling vehicle so that it can be detached from the bolt attached to the bottom of the tundish. Is provided so as to be able to move back and forth. As means for moving the bolt rotating device back and forth on the lifting platform, for example, a method of installing the bolt rotating device on a platform provided on the lifting platform so as to be able to move back and forth by a fluid pressure cylinder is used. it can.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a side view showing an entire configuration example of an immersion nozzle replacement device in a continuous casting facility according to the present invention, FIG. 2 is a plan view of the same device, and FIG. 3 is a rotary nozzle in the same device. FIG. 4 is an enlarged vertical sectional side view of a main part, showing an attachment part of the holding arm in an enlarged manner;
3 is an elevating table, 4 is a forward / backward moving table, 5 is a nozzle elevating device, 6 is a bolt rotating device, 7 is an immersion nozzle, 10 is a tundish, 11 is a sliding nozzle, 12 is a rotary nozzle holding arm, and 13 is a rotating nozzle holding arm. It is an immersion nozzle holding device.

The traveling trolley 1 is movably mounted via wheels 1-2 on a rail 1-1 of a predetermined length attached to an off-line work floor, and a drive motor 1 mounted on the trolley.
Reference numeral 3 designates an arrangement in which a predetermined stroke forward / backward drive is possible via a speed reducer and a power transmission mechanism (not shown). The hydraulic cylinder 2-2 mounted on the traveling vehicle 1 is slidably mounted on a rail 2-1 attached to the traveling vehicle 1 in a direction perpendicular to the traveling direction of the vehicle.
A horizontal moving platform 2 movable in a direction perpendicular to the traveling direction of the bogie is provided, and a nozzle elevating device 5 for transferring the immersion nozzle 7 to the leading end side of the lateral bogie 2 on the traveling bogie is provided. . The nozzle elevating device 5 includes a fluid pressure cylinder 5-1 suspended vertically at an end of the horizontal moving table 2 via a bracket 2-2, and a pair of left and right horizontally mounted at a rod end of the cylinder. Nozzle hanger arm 5-
And 2. Nozzle hanger arm 5-2
An engagement groove 5-2a is formed on the top surface of the tip of
When the immersion nozzle 7 is delivered, the arm 7-1 of the nozzle holder 7-1 mounted on the base end of the immersion nozzle 7 in the engagement groove 5-2a of the nozzle hanger arm 5-2.
a is engaged.

Further, on the horizontal moving base 2, the horizontal moving base 2 is inserted substantially in the center thereof, and the horizontal moving base 2 penetrates through a rectangular window hole 1-4 previously formed in the traveling vehicle 1. A lifting table 3 is installed which is supported horizontally so as to be able to move up and down by a fluid pressure cylinder 3-1 suspended vertically. At four corners of the horizontal moving table 2, guide rods 3-2 of the lifting table 3 are provided with hydraulic cylinders 3.
Similarly to -1, it is vertically suspended through the inside of the window hole 1-4. A tundish 1 is located at the center of the lift 3.
A bolt rotating device 6 for rotating a bolt 13-2 with a nut for rotating the rotary nozzle holding arm 12 attached to the 0 side in the vertical direction is mounted. The bolt rotating device 6 is mounted on a forward / backward moving platform 4 which can move back and forth in the same direction as the traveling vehicle 1 by a fluid pressure cylinder 4-1 horizontally installed on the elevating platform 3. Is removably fitted to the tip of a rod 6-3 horizontally installed rotatably on a frame 6-1 installed on the forward / reverse table 4 and to the nut 13-2a of the bolt 13-2 with nut. A socket 6-4 is attached, and a rod 6-3 is rotated by gears 6-5a and 6-5b by a motor 6-2 installed on the forward and backward carriage 4. ing.

A rotary nozzle holding arm 12 mounted on the bottom of the tundish 10 in close proximity to the sliding 11 supports a immersion nozzle holding device 13 mounted on the bottom of the tundish 10 with a trunnion shaft 13-1 as a fulcrum. The immersion nozzle holding device 13 has a structure which is horizontally slidably mounted on a base 13-1 fixed to the bottom of the tundish 10 and is attached to the base 13-1. A cam plate 13-4 in which a guide groove 13-4a is formed is attached to a slider 13-3 connected to a bolt 13-2 with a nut that is screwed, and the cam plate 13-4 is turned vertically about a trunnion shaft 13-1 as a fulcrum. A pair of left and right pivotable nozzle holding arms 1 movably mounted
The guide rollers 13-6 attached to both ends of the lifting shaft 13-5 are loosely fitted in the guide grooves 13-4a of the cam plate 13-4, and the nuts 13-
A mechanism in which the nozzle holding arm 12 is turned up and down by the cam plate 13-4 moving forward by the rotation of the nozzle plate 2. An engagement groove 12-1a is formed on the upper surface of the tip of the nozzle holding arm 12, and when the immersion nozzle 7 is delivered, the immersion nozzle 7 is inserted into the engagement groove 12-1a of the nozzle holding arm 12. The arm 7-1a of the nozzle holder 7-1 attached to the base end of the nozzle holder 7-1 is engaged.

That is, the above immersion nozzle holding device 13
When the immersion nozzle holder is raised, the slider 13-3 moves to the right when the bolt 13-2 with the nut is rotated, so that the guide roller 13-6 moves along the guide groove 13-4a of the cam plate 13-4. At the same time, the rotary nozzle holding arm 12 integrated with the elevating shaft 13-5 rises with the trunnion shaft 13-1 as a fulcrum, and the arm 7-1a of the nozzle holder 7-1 is pushed up (in the solid line in FIG. 3). Position). Also, when the immersion nozzle holder is lowered, the slider 13-3 moves to the left when the bolt 13-2 with the nut is rotated in the opposite direction to that when the immersion nozzle holder is raised, whereby the guide groove 13-4a of the cam plate 13-4 is moved. The guide roller 13-6 is pushed down along the axis, and at the same time, the rotary nozzle holding arm 12 integrated with the elevating shaft 13-5 descends with the trunnion shaft 13-1 as a fulcrum, and the arm 7-1a of the nozzle holder 7-1. Is pushed down (the position shown by the chain line in FIG. 3).

When the immersion nozzle 7 is mounted on the bottom of the tundish 10 by the immersion nozzle exchanging device having the above structure, the immersion nozzle 7 is mounted on the nozzle hanger arm 5-2 of the nozzle elevating device 5 of the device, which is waiting at a predetermined position. , Immersion nozzle 7
In a state where the arm 7-1a of the nozzle holder 7-1 attached to the base end of the carriage 1 is engaged and set, the traveling carriage 1 is moved to the sliding nozzle 11 side to a predetermined position (forward limit position). To stop. Next, for positioning, the horizontal moving table 2 is moved by the fluid pressure cylinder 2-2 in a direction perpendicular to the running direction of the carriage so that the radial center line of the immersion nozzle 7 matches the radial center line of the sliding nozzle 11. . Thereafter, the hydraulic cylinder 5-1 of the nozzle elevating device 5 is operated to operate the nozzle hanger arm 5-2.
The immersion nozzle 7, which is supported by hanging, is raised to the upper limit position and held. Subsequently, the traveling vehicle 1 is retracted to the nozzle mounting position, and at the position where the vertical center line of the sliding nozzle 11 and the vertical center line of the immersion nozzle 7 coincide, the lifting platform 3 horizontally supported above the horizontal moving platform 2 is moved. It is raised by the fluid pressure cylinder 3-1 and the socket 6 of the bolt rotating device 6
When the center of -4 is aligned with the center of the bolt 13-2 with a nut of the immersion nozzle holding device 13, the forward / backward moving platform 4 on the lifting / lowering platform 3 is moved toward the sliding nozzle 11 by the hydraulic cylinder 4-1. Socket 6 of rotating device 6
-4 is externally fitted to the nut 13-2a of the bolt 13-2 with a nut. In this state, the motor 6-2 of the bolt rotating device 6
Is driven to rotate the bolt 13-2 with the nut by the set number of rotations, the rotary nozzle holding arm 12 rotates upward with the trunnion shaft 13-1 as a fulcrum, and the nozzle holder 7-
When the first arm 7-1a is pushed up, the immersion nozzle 7 is lifted up, detached from the nozzle hanger arm 5-2 of the nozzle elevating device 5, and the immersion nozzle 7 is pressed against the sliding nozzle 11. When the immersion nozzle 7 is pressed against the sliding nozzle 11 in this manner, the forward and backward
Is retracted by the hydraulic cylinder 4-1 and the socket 6
-4 is disengaged from the nut 13-2a of the bolt 13-2 with a nut.
The nozzle hanger arm 5-2 is lowered to the original height position by operating the fluid pressure cylinder 5-1 of the nozzle elevating device 5 to the original height position.
Then, the traveling vehicle 1 is moved backward and stopped at the standby position.

Next, when replacing the old immersion nozzle 7 at the bottom of the tundish 10 with a new immersion nozzle, the traveling carriage 1 of the apparatus, which is waiting at a predetermined position, is moved to the sliding nozzle 11 side. It stops at the mounting position of the immersion nozzle 7. Next, the lifting table 3 horizontally supported above the horizontal moving table 2 is raised by the hydraulic cylinder 3-1 and the center of the socket 6-4 of the bolt rotating device 6 is provided with the nut of the immersion nozzle holding device 13. The center of the bolt 13-2 is made to coincide with the center of the bolt 13-2, and in this state, the forward / backward stage 4 on the elevating platform 3 is moved toward the sliding nozzle 11 by the hydraulic cylinder 4-1 and the socket 6-4 of the bolt rotating device 6 is nutd. It is externally fitted to the nut 13-2a of the bolt 13-2. After that, the bolt with nut 1 is driven by the motor 6-2.
3-2 is rotated in the direction opposite to the direction in which the nozzle is mounted, and the rotary nozzle holding arm 12 is lowered to release the immersion nozzle 7 from the sliding nozzle 11. When the rotary nozzle holding arm 12 is lowered to a predetermined height position, the hydraulic cylinder 5-1 of the nozzle elevating device 5 is operated to raise the nozzle hanger arm 5-2, and the rotary nozzle holding arm The arm 7-1a of the nozzle holder 7-1 of the immersion nozzle 7 supported by the nozzle 12 is pushed up, the immersion nozzle 7 is detached from the rotary nozzle holding arm 12, and the nozzle hanger arm 5-2 of the nozzle elevating device 5 is moved. Receive to the side. When the immersion nozzle 7 is received by the nozzle elevating device 5, the traveling carriage 1 is advanced to a predetermined position (the forward limit position) to completely separate the immersion nozzle 7 from the rotary nozzle holding arm 12, and then to elevate the nozzle The hydraulic cylinder 5-1 of the device 5 is operated to lower the immersion nozzle 7 suspended and supported by the nozzle hanger arm 5-2.
Is retracted to a predetermined standby position. At this position, the old immersion nozzle 7 is removed from the replacement device, and the new immersion nozzle 7 is replaced with the nozzle hanger arm 5-2 of the nozzle elevating device 5.
Then, the arm 7-1a of the nozzle holder 7-1 attached to the base end of the immersion nozzle 7 is engaged and set. Thereafter, a new immersion nozzle 7 is attached to the sliding nozzle 11 in the same procedure as described above, and the nozzle replacement operation is completed.

In the above immersion nozzle exchanging device, the traveling carriage 1, the lateral moving table 2, the elevating table 3, the forward / backward moving table 4, the nozzle elevating apparatus 5, the bolt rotating apparatus 6, etc. are all controlled by a control panel by remote control. You. Also immersion nozzle 7
Needless to say, the positioning, the upper and lower limit positioning of the bolt rotating device 6 with the nut, the number of rotations of the nut, and the like are automated using various detectors.

[0019]

As described above, according to the present invention, the following effects can be obtained. (1) The immersion nozzle replacement work and the mounting work can be automated, and it is safe, and the man-hour and work time can be greatly reduced. (2) Since the immersion nozzle replacement operation is performed off-line, troubles such as burning of various detectors and electrical wiring of the immersion nozzle replacement device due to radiant heat are eliminated. (3) Even if the immersion nozzle replacement device fails, the immersion nozzle replacement device can be repaired without stopping the operation because it is off-line, and the production capacity does not decrease.

[Brief description of the drawings]

FIG. 1 is a side view showing an overall configuration example of an immersion nozzle replacement device in a continuous casting facility according to the present invention.

FIG. 2 is a plan view of the same device.

FIG. 3 is an enlarged vertical cross-sectional side view showing a main part of a mounting portion of the rotary nozzle holding arm in the same device.

FIG. 4 is a schematic view showing an example of a conventional immersion nozzle replacement device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Traveling trolley 2 Lateral moving table 3 Elevating table 4 Forward / backward moving table 5 Nozzle elevating device 6 Bolt rotating device 7 Immersion nozzle 10 Tundish 11 Sliding nozzle 12 Rotary nozzle holding arm 13 Immersion nozzle holding device

Claims (1)

[Claims] 1. An apparatus for off-line replacement of an immersion nozzle mounted on a tundish bottom of a continuous casting facility, comprising a trunnion shaft via a cam plate supported on the bottom of the tundish so as to be able to move back and forth by rotation of bolts. The immersion nozzle is held by a pair of left and right rotating nozzle holding arms mounted so as to rotate in the vertical direction with the fulcrum as a fulcrum, and the immersion nozzle is replaced by an immersion nozzle attachment / detachment device installed in a transfer means such as a moving carriage. In the immersion nozzle replacement device of the method of performing the above, on the traveling carriage arranged so as to be able to drive forward and backward toward the immersion nozzle at the bottom of the tundish, a horizontal moving platform movable in a direction perpendicular to the traveling direction of the truck is provided. A nozzle elevating device comprising a fluid pressure cylinder for gripping and moving the immersion nozzle up and down is disposed on the horizontal moving table, and further provided so as to be able to move up and down on the horizontal moving table. A bolt rotation device with a nut for rotating a support bolt for rotating the rotary nozzle holding arm in the vertical direction is provided on the lift table so as to be movable back and forth in the same direction as the carriage. Immersion nozzle replacement device in continuous casting equipment.