JPS621448B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a slag cutting device that prevents slag from being mixed into an outflowing molten steel flow when molten steel is tapped from a converter.

Conventionally, a slag cutting device was constructed so that it could be freely entered from the furnace mouth into a tilted converter during steel tapping, and a stopper support arm with a stopper swingably suspended at its tip was attached so that it could move forward and backward. It is fixedly installed on the work floor.

However, this installation structure of the slag cutting device is extremely inconvenient when performing other work before the hearth, such as repairing and lining the melted parts of the furnace wall in the converter, and there are no problems in that respect. Improvement was desired.

The present invention aims to solve the above-mentioned problems of the conventional slag cutting device, and its purpose is to arrange a cart on which the slag cutting device is installed so that it can run in front of the furnace mouth of the converter in a direction intersecting the converter axis. By installing the slag cutting equipment, the main body of the slag cutting equipment can be easily moved from the front of the converter.
The purpose is to improve the efficiency of the entire hearth work.

The present invention provides an arm drive mechanism on a trolley that can run on a portal frame provided on the floor in a direction intersecting the converter axis in front of the converter, and the arm drive mechanism allows a nozzle stopper to swing freely at the tip. This invention relates to a slag cutting device used in a converter, etc., characterized in that a stopper support arm that is suspended and extendable into the converter can be moved forward and backward, raised and lowered, and raised and lowered.

Hereinafter, a detailed explanation will be given based on the embodiment shown in the attached drawings. FIG. 1 is a side view of the slag cutting device according to the present invention installed on the back side of the converter C, and FIG. 2 is a side view of the same plane. A diagram is shown.

The slag cutting device 1 is mounted on a cart 2 that can freely run on a gate-shaped frame F installed on the back side of the converter, and is equipped with a hydraulic cylinder 3 for lifting and lowering, so as to be movable in a direction perpendicular to the axis of the converter C. It is attached in such a manner that it is suspended via a table 4 on the lower side of the trolley 2. Also, in this embodiment, frame F
is installed on an upper movable floor M equipped with wheels K that can be moved on a working floor O on the back side of the furnace, and as shown in FIG. Both the slag cutting device 1 and the upper movable bed M can be moved or removed from the front of the converter C by hooking them to the hook H of an installed large traveling crane or the like (not shown). The upper movable floor M is provided with a heat shield P of a required height on the converter C side, and in one corner is provided with a motor Q for rotating wheels K and an operation panel S for operating the motor.

The frame F is formed with rail portions 5 having a required parallel interval orthogonal to the converter C axis in FIG. 2, which is a plan view of FIG. A rail R having a rectangular cross section on which wheels of a bogie 2 (to be described later) roll is integrally fixed to the upper surface of the rail portion.

FIG. 4 shows a side view showing how the cart 2 and the slag cutting device 1 are installed, and the cart 2 has wheels 6 that are rotatably driven by a required electric motor and roll on a rail R on a frame F. In order to prevent the trolley 2 from overturning or from floating on one side during operation of the slag cutting device 1, the rails of the frame F A roller 7 is provided that partially contacts and rolls on the lower surface side of the member constituting the portion 5. 8 is a truck 2 together with a hydraulic cylinder 3 for lifting and lowering.
This is a guide sliding tube for the lifting rod 9 that supports the table 4 on the lower side so that it can be raised and lowered, and the guide sliding tube 8 and the lifting rod 9
This allows the table 4 to be moved up and down while maintaining its horizontal position with respect to the cart 2. The guide tube can also prevent the cylinder rod 3a of the hydraulic cylinder 3 from breaking when the cylinder rod 3a expands and contracts.

The slag cutting device 1 is rotatably supported midway by a pivot joint 10 on the lower side of the table 4, and the table 4 is connected to the converter C side from the pivot joint 10.
A hydraulic cylinder 11 for tilting the arm is provided, and is pivotally supported by the end of a cylinder rod 12 of the hydraulic cylinder, and as the cylinder rod 12 expands and contracts, the slag cutting device 1 can tilt about the pivot 10 as a fulcrum.

The slag cutting device 1 will be described below.The device includes a stopper support arm 14 having a stopper 13 swingably suspended at its tip, an arm guide tube 15 that surrounds the stopper support arm in a movable manner, and a top of the arm guide tube 15. It is comprised of an arm feeding mechanism 16 that is attached to and feeds out the stopper support arm 14 into the converter C so that it can move forward and backward. This arm feeding mechanism 16 uses a drive motor 17 attached to the upper surface of the arm guide tube 15 as a driving source, and pinions 18 arranged on both sides of the arm guide tube 15 are attached to a worm wheel (not shown) attached to the upper end of the shaft. The stopper support arm 1 is rotated by the meshing of the worm 19 with the pinion, and the stopper support arm 1 is rotated by the meshing of the pinion with racks 20 attached to both side walls of the stopper support arm 14.
4 can advance and retreat.

The slag cutting operation by the slag cutting device 1 having the above configuration will be described below. First, when the converter C starts tilting in the tapping direction, the cart 2 is moved from the storage position shown by the dashed line in FIG. 2 to the position shown by the solid line in the same figure. The stopper support arm 14 is moved until the axis line of the stopper support arm 14 and the axis line of the converter furnace C coincide with each other so that they are coaxial, and the stopper support arm 14 is stopped and held at the same position. This positioning can be reliably performed by using a positioning hydraulic cylinder attached to the truck 2 and a positioning stopper (both not shown) provided on the rail R portion. Next, by operating the hydraulic cylinder 3 for raising and lowering the table 4 and extending the cylinder rod 3a, the stopper support arm 14 and the stopper 13 can be inserted from the furnace opening of the converter C tilted at approximately 90 degrees. Lower the table 4 until When the tilting angle of the converter C reaches 90 degrees, the tilting of the converter C is temporarily stopped, and during this stop period, the arm feeding mechanism 16 is operated to move the stopper support arm as shown in Fig. 5. 14 into the converter C, and by operating the arm tilting hydraulic cylinder 11, the cylinder rod 12 is extended, and the stopper support arm 14 is tilted downward within the converter. Cooling water is circulated through the stopper support arm 14 from the start of its entry into the converter C to prevent the arm from overheating.

When the downward tilting of the stopper support arm 14 is completed, the converter C is again tilted to the final tapping angle (for example, 96 degrees) as shown in FIG. Furthermore, the table 4 is lowered, the stopper 13 is brought to the tapping port E to temporarily stop tapping, and then the hydraulic cylinder 3
is retracted and pulled up to a specified dimension (for example, 20 to 40 mm) (this amount of lifting is done by a limit switch (not shown) disposed on the stopper support arm 14), and further from the gap between the lower end of the stopper 13 and the inner wall of the converter C. Let the steel be tapped. When tapping is completed, the table 4 and the stopper support arm 14 are immediately lowered by the hydraulic cylinder 3, the stopper 13 is brought to the tapping port E, and the slag is cut. At the same time, the converter C is reversely rotated, and the converter It is stopped as shown in Fig. 7 at an angle that does not allow the slag inside to be discharged. Next, as shown in the same figure, the cylinder rod 12 of the hydraulic cylinder 11 is
The stopper support arm 14 is returned to the horizontal state from the downwardly tilted state by retracting the table 4 and the stopper support arm 14 is then retracted in the same manner by retracting the cylinder rod 3a of the hydraulic cylinder 3. Then, the arm feeding mechanism 16 is reversed to move the stopper support arm 14 and the stopper 13 to the converter C.
Take it out from inside.

After the stopper support arm 14 is removed, the converter C continues to rotate so as to return to its original upright position, and the cart 2 travels to the storage area shown in Fig. 2 and stops, and a series of steel tapping operations are carried out. This completes the slag cutting work.

In addition, when repairing inside the converter C, the slag cutting device 1 is moved to one side, so the front of the converter C is open, and the required lining car (not shown) is moved to the gate-shaped frame F. If you move it so that it can pass underneath and install it, you can easily perform converter lining repair work. Furthermore, in the case of large-scale repair and inspection work on converter C or replacement of the converter,
If the upper movable floor M is removed from the front of the converter using a crane via the wire rope W as described above, the above-mentioned various operations can be carried out easily as well.

As described above, since the slag cutting device according to the present invention can be easily moved and removed from the front of the converter, work in front of the converter hearth, that is, repair and inspection work, lining work, etc., is easy to perform, and the device itself Since the structure is simple, maintenance and inspection can be carried out easily.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the slag cutting device according to the present invention installed on the back side of a converter, Fig. 2 is a plan view of the same, and Fig. 3 shows the upper movable bed suspended with wire ropes. 4 is a side view of the slag cutting device, FIG. 5 is a side view showing the stopper support arm entering the converter and tilted downward, and FIG. FIG. 7 is an explanatory diagram showing the procedure for pulling up the stopper support arm from inside the converter. 1...Slag cutting device, 2...Dolly, 13...
...Stopper, 14...Stopper support arm, C...
...Converter, F...frame.

Claims (1)

[Claims] 1. An arm drive mechanism is provided on a cart that can run on a portal frame provided on the floor in a direction intersecting the converter axis in front of the converter mouth, and the arm drive mechanism A slag cutting device used in a converter, etc., characterized in that a nozzle stopper is swingably suspended at the tip of the converter, and a stopper support arm that can be freely extended into the converter can be moved back and forth, raised and lowered. 2. The slag cutting device used in a converter or the like according to claim 1, wherein the portal frame is provided on an upper movable floor surface of a double bed structure consisting of a lower fixed floor and an upper movable floor.