JPH1024355A - Instrument for detecting molten metal surface in mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate such trouble that the measuring accuracy is lowered by sticking of spattering molten metal developed at the starting time of supplying the molten metal to a molten metal surface level meter, and further, to improve the workability by unnecessitating attaching/detaching work. SOLUTION: On a truck frame 12 of a tundish car 3 for loading a tundish, a movable arm 14 for holding a pair of the molten metal surface level meters 13 arranged at the tip part so as to be freely advanced/retracted above a mold 7 near both side parts of a tundish nozzle 8 with an arm advancing/retracting device 16. At the base end side of this movable arm 14, an arm tilting device 15 shifted so as to elevate/lower the molten metal surface level meters 13 through the movable arm 14, is arranged. A sensor traversing device 17 moved so as to mutually approach/separate the molten metal surface level meters 13 is arranged on the movable arm 14. By this constitution, after starting the supply of molten metal, the molten metal surface level meter can be moved and arranged at a prescribed position above the molten metal surface of the mold.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold level detector for controlling a mold level in a continuous casting facility.

[0002]

2. Description of the Related Art In a continuous casting operation, it is extremely important to control the level of molten metal supplied into a mold in order to maintain good surface and internal properties of a slab and to stabilize the operation. As a device for detecting the level of the molten metal, for example, Japanese Utility Model Publication No. 4-51015 discloses a device in which a level meter is provided at the bottom of a tundish via a position adjusting mechanism.

[0003]

However, according to the above-mentioned conventional structure, it is necessary to set the position of the level gauge to an appropriate range above the molten metal level which can be measured accurately before starting the supply of the molten metal. Sometimes splashes of molten metal splatter,
There is a possibility that the measurement accuracy may be reduced by adhering to the level meter. In addition, since the level gauge is provided at the bottom of the tundish, it is necessary to attach and detach the tundish every time the tundish is replaced, which has a problem that the workability is extremely poor.

According to the first aspect of the present invention, the above-mentioned problems are solved and there is no problem that the measurement accuracy of the level gauge is lowered due to the adhesion of the molten metal splash at the start of the molten metal supply. It is another object of the present invention to provide a mold level measuring device which is unnecessary and has good workability.

[0005]

According to a first aspect of the present invention, there is provided a tundish car having a tundish mounted on a main body frame having a level gauge at a tip end thereof. An arm is provided, and an arm retraction device is provided for moving the level gauge above and below the level of the mold in the vicinity of the side of the tundish nozzle. An elevation position adjusting means for elevating and lowering the surface level meter is provided.

According to a second aspect of the present invention, a movable arm having a pair of level gauges is provided at the tip of a body of a tundish car on which a tundish is mounted, and the level gauge is provided with a tundish nozzle. An arm retraction device is provided for retracting above and below the surface of the mold near both sides, and at the base end side of the movable arm, lifting and lowering position adjusting means for raising and lowering the metal level gauge via the movable arm is provided. The movable arm is provided with traversing position adjusting means for moving the level gauge closer to and away from each other.

[0007] According to the above structure, since the level gauge is provided at the tip of the movable arm which can be moved up and down and can move up and down in the tundish car. The level gauge can be moved and arranged above the level. Therefore, it is possible to prevent contamination of the level gauge due to scattering of the molten metal that occurs immediately after the supply of the molten metal to the mold is started, and it is possible to accurately measure the molten metal level. Further, unlike the related art, it is not necessary to attach and detach the measuring device every time the tundish is replaced, and the workability is good.

According to the second aspect of the present invention, in addition to the above-described structure, the traversing position adjusting means is provided, so that the pair of level gauges can be moved close to and away from each other, and easily and quickly according to the mold and casting conditions. The position of the level gauge can be adjusted.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Here, an embodiment of a mold level detecting device according to the present invention will be described with reference to FIGS.

As shown in FIGS. 6 and 7, a continuous casting facility equipped with this level detector is provided with a self-propelled tundish car 3 on a pair of traveling rails 2 laid on a work floor 1. Are movably arranged. The tundish car 3 has a tundish 4 to be exchanged for each operation supported by a lifting frame 6 via four lifting jacks 5 so as to be movable up and down. Two tundish nozzles 8 are hung down corresponding to the two molds 7 arranged in 1.

At the front and rear of the bogie frame 12 of the tundish car 3 respectively corresponding to the molds 7, a molten metal level detecting device 11 according to the present invention is provided.
That is, as shown in FIGS.
In addition, a movable arm 14 is provided at the tip end of which two level gauges 13, 13 each composed of an eddy current type magnetic sensor or the like can be moved up and down above the mold 7 near the side of the tundish nozzle 8. . The carriage frame 12 is provided with an arm tilting device 15 which is a means for adjusting the elevation level of the level gauges 13, 13. Also, this movable arm 14
Base side arm 14a held by arm tilting device 15
An intermediate traversing arm 14b disposed in the front-rear direction at the distal end of the proximal arm 14a, and two distal arms 14c, 14c extending from the intermediate traversing arm 14b to the vicinity of the front and rear sides of the tundish nozzle 8. An arm extension / retraction device 16 is built in the proximal arm 14a, and a sensor traversing device 17 as traversing position adjusting means is built in the intermediate traversing arm 14b.

The details will be described below. Arm tilting device 15
As shown in FIGS. 1 to 3, the tilting frame 22 is rotatably supported on the base end side of the bogie frame 12 via a horizontal pin 23 in the front-rear direction, and is attached to the support member 21. The operating end of the lifting actuator 24 is connected to the tip end of the tilting frame 22. The two guide rollers 25 projecting from the support member 21 are movably fitted into two arc-shaped guide holes 26 formed in the tilting frame 22. Therefore, by driving the lifting / lowering actuator 24, the tilting frame 2
By moving the movable arm 14 in the vertical direction through the movable member 2, the level gauge 13 can be moved up and down in a predetermined range to adjust the vertical position.

As shown in FIGS. 1 to 3, the arm retracting device 16 has a retractable rail 32 attached to the upper and lower surfaces of a slide frame 31 of the proximal end arm 14a in a longitudinal direction. A slide receiving member 33 for movably supporting the retractable frame 32 is provided, and the slide frame 31 is held. A retractable actuator 34 is provided on the tilting frame 22 corresponding to the slide frame 31, and its operating end is connected to the slide frame 31. Therefore, by driving the actuator 34 for retreat, the movable arm 1 is moved.
4 can be moved back and forth within the range indicated by the solid line and the virtual line.

As shown in FIGS. 4 and 5, a pair of left and right transverse frames 43A and 43B are slidably disposed on a transverse frame 41 of the intermediate transverse arm 14b via transverse rails 42 provided on upper and lower surfaces. The distal end arms 14c are supported by the transverse frames 43A and 43B, respectively. The sensor traversing device 17 built in the horizontal frame 41 moves the traversing frames 43A and 43B in the relative direction at the same distance to move the distal arms 14c closer to and away from each other, so that the level gauge 13,
The position 13 is disposed at a position appropriate for detecting the level of the molten metal, which is distant from the tundish nozzle 8 corresponding to the mold 7. That is, a pair of sprockets 45, 45 arranged at both ends in the horizontal frame 41, and a pair of horizontal sprockets 45, 45, both ends of which are connected to the left and right horizontal frames 43A, 43B and wound around the right or left sprocket 45, 45, respectively. It comprises chains 46, 46, and a traversing actuator 47 with a position sensor whose frame is fixed in the horizontal frame 41 and whose working end is connected to the right traversing frame 43A. Therefore, by driving the traversing actuator 47 to expand and contract, the right traversing frame 43A is slid and the traversing chain 4A is moved.
6, the left transverse frame 43B can be moved in the opposite direction by the same distance as the right transverse frame 43A. Reference numeral 48 denotes a bellows-like cover that covers the movable range of the horizontal frames 43A and 43B of the horizontal frame 41.

As shown in FIG. 1, the distal end side arm 14c includes a support frame 51 and a support pipe 52 held by the support frame 51. The distal end of the support pipe 52 is bent obliquely downward and is heated. The level gauge 13 is attached, and a cable 53 for transmitting and receiving signals to and from the level gauge 13 is built in the support pipe 52 and is protected from heat and the like.

In the above configuration, the tundish car 3
Is stopped at a predetermined position, and the tundish nozzles 8 are mounted on the tundish 4, respectively. The tundish nozzles 8 are opened and the molten metal in the tundish 4 is supplied into the mold 7. Then, when a predetermined amount of the molten metal is accumulated in the mold 7, the molten metal level detecting device 11 is operated. First,
The traversing actuator 47 of the sensor traversing device 17 is driven in accordance with the mold 7 and casting conditions to be used, and the position of the level gauge 13 in the width direction is determined. After the movable arm 14 is raised by the arm tilting device 15 and the level gauge 13 is held at the raised position, the arm moving device 1
6 move-out actuator 34 is advanced to move the movable arm 1
4 is protruded toward the mold 7 so that the level gauge 13 faces above the mold 7. Furthermore, the actuator 24 for lifting and lowering
Is contracted to swing the movable arm 14 downward, and the level gauge 13 is lowered to a predetermined position above the level 7a where accurate measurement is possible. Then, the detection of the molten metal surface 7a is started and the continuous casting is started, and the supply amount of the molten metal from the tundish nozzle 8 is controlled so that the molten metal surface level is in an optimum range.

After the continuous casting is completed, the arm tilting device 15
Then, the level gauge 13 is raised, then the arm is moved backward and downward by the arm egress / retract device 16, and the apparatus is made to stand by.

According to the above-mentioned embodiment, after the supply of the molten metal from the tundish 4 to the mold 7 is started and a predetermined amount of molten metal is accumulated in the mold 7, the level detector 11 is operated to operate the level gauge. 13 can be arranged at a predetermined position above the molten metal surface 7a for setting, so that it is possible to eliminate the adverse effect that the molten metal scattered at the start of supply of the molten metal adheres to the molten metal level gauge 13 and causes an error in the measured value. . Further, it is not necessary to attach / detach the hot water level detecting device from the tundish 8 every time the tundish 8 is replaced as in the related art. Further, the position of the level gauge 13 can be quickly and easily changed by remote control in accordance with the mold 7 and casting conditions, and the workability is extremely good.

[0019]

As described above, according to the first aspect of the present invention, the level gauge is provided at the tip end of the movable arm which is arranged to be able to move up and down and move up and down in the tundish car. After the molten metal supply is started and the molten metal is accumulated, the molten metal level gauge can be moved and arranged above the molten metal level. Therefore, it is possible to prevent contamination of the level gauge due to scattering of the molten metal that occurs immediately after the supply of the molten metal to the mold is started, and it is possible to accurately measure the molten metal level. Further, unlike the related art, it is not necessary to attach and detach the measuring device every time the tundish is replaced, and the workability is good.

According to the second aspect of the present invention, in addition to the above-described structure, the traversing position adjusting means is provided, so that the pair of level gauges can be moved close to and away from each other to easily or quickly match the mold and casting conditions. The position of the level gauge can be adjusted.

[Brief description of the drawings]

FIG. 1 is an overall side view showing an embodiment of a mold level detecting device according to the present invention.

FIG. 2 is an overall plan view of the mold level detecting device.

FIG. 3 is a front sectional view of the mold level detecting device.

FIG. 4 is a rear sectional view showing a sensor traversing device of the mold level detecting device.

FIG. 5 is a sectional view taken along the line AA shown in FIG. 4;

FIG. 6 is a plan view showing a continuous casting facility provided with the mold level detecting device.

FIG. 7 is a side view showing a continuous casting facility provided with the mold level detecting device.

[Explanation of symbols]

 Reference Signs List 3 tundish car 4 tundish 7 mold 8 tundish nozzle 11 level detector 12 cart frame 13 level gauge 14 movable arm 14a base end arm 14b intermediate traverse arm 14c tip end arm 15 arm tilting device 16 arm retreat Apparatus 17 Sensor traversing device 22 Tilt frame 23 Horizontal pin 24 Actuator for raising and lowering 34 Actuator for moving in and out 47 Actuator for traversing 52 Support pipe

Claims (2)

[Claims] A movable arm having a level gauge at a tip thereof is provided on a body frame of a tundish car on which a tundish is mounted, and the level gauge is placed near a side of a tundish nozzle. A mold leveling means provided with an arm retraction device for moving up and down, and a raising / lowering position adjusting means for raising / lowering the level gauge via the movable arm at a base end side of the movable arm; Detection device. 2. A tundish car body frame having a tundish mounted thereon is provided with a movable arm having a pair of level gauges at a tip end thereof, and the level gauge is mounted on a mold near both sides of a tundish nozzle. An arm retraction device is provided for moving up and down above the surface of the molten metal. At the base end of the movable arm, elevation position adjusting means for moving the level gauge up and down via the movable arm is provided. A mold level detecting device comprising a traversing position adjusting means for moving a level gauge toward and away from each other.