JPS621450B2 - - 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 tapping, and a stopper support arm with a stopper suspended at the tip for closing the tapping port was attached so that it could move forward and backward. It is fixedly placed on the work floor at the back of the furnace, but with this type of equipment installation structure, it is difficult to carry out work in front of the furnace, such as repairing and lining damaged areas on the furnace wall inside the converter. The drawback is that it is extremely inconvenient.

The present invention solves the above problems by installing a slag cutting device on a truck that can run across the converter axis in front of the converter so that it can be moved from the front of the converter. By providing a positioning mechanism that holds the slag cutting device in place relative to the converter, it is possible to perform reliable slag cutting work.Moreover, in the event of a power outage, the same positioning mechanism acts as a brake when the trolley runs. The purpose of this is to prevent accidents during power outages by configuring the

In the present invention, a frame can be positioned on the floor in front of the converter mouth, and a truck that can run in a direction intersecting the converter axis is disposed on the frame, and the truck has a stopper at the tip. A converter, etc., characterized in that a stopper support arm to which a stopper is attached is provided so as to be movable back and forth within the converter, and a positioning mechanism is provided that engages with an engaging portion formed on a frame to hold the cart at a predetermined position. This relates to a slag cutting device used for.

Hereinafter, more specifically, based on the embodiment shown in the attached drawings, FIG. 1 shows a side view of a slag cutting device according to the present invention installed on a work floor O located on the back side of a converter C. FIG. 2 shows a plan view of the same. In this embodiment, the gate-shaped frame F is erected on an upper movable floor M having wheels K that can be moved on the work floor O, and the trolley 2 on which the slag cutting device 1 is attached is mounted in a direction substantially perpendicular to the axis of the converter C. In order to be able to run, the frame F is constructed so that the rail portion surface 3 of the parallel portion of the upper surface 2 is perpendicular to the converter axis as shown in FIG. Two hydraulic cylinders 4 are vertically installed on the truck 2, and a table 7 that supports the slag cutting device 1 in a vertically movable manner by a tilting cylinder 6 is connected to a cylinder rod 5 of the cylinders. Due to cylinder rod 5
A guide cylinder 8 and a guide rod 9, which guide the vertical elevation of the table, are vertically disposed on the cart 2 and the table 7, respectively.

The slag cutting device 1 includes a stopper support arm 11 that swingably suspends a stopper 10 for nozzle closing at its tip, and an arm guide tube 12 that is provided at a position corresponding to directly below the table 7 and houses the stopper support arm 11. The main part of the stopper support arm 11 is composed of an arm feeding mechanism section 13 that is provided integrally with the arm guide tube, and the stopper support arm 11 is raised and lowered by a hydraulic cylinder 4, and raised and raised by a tilting cylinder 6, and the arm is fed out. The mechanical portion 13 allows forward and backward movements, and by interlocking the above-mentioned operations, the stopper support arm 11 and the stopper 10 can be brought into the converter C as shown by the dashed line in FIG. Stopper 1 on tap E of converter C
The slag cutting operation can be performed by closing the 0.

A necessary electric motor 14 and wheels 15 rotationally driven by the electric motor 14 are attached to the trolley 2, and the wheels 15 roll on a rail 16 having a square cross section and fixed on the rail surface 3 of the frame F. , the trolley 2 can run in a direction substantially perpendicular to the converter C axis, and is moved so that the converter C axis and the stopper support arm 11 axis are coaxial as shown by the solid line in the same figure from the storage position shown by the dashed line in FIG. It is possible to move to a suitable working position and move in the opposite direction. Also, on one side of the trolley 2, the wheel 1
A positioning hydraulic cylinder 17, which is a part of the positioning mechanism that is the gist of the present invention, is vertically installed on the rolling line of 5, and is engaged with the rail surface 3 to prevent the main body of the truck 2 from tilting and floating. A rolling anti-floating roller 18 is provided, so that the truck 2 can always run stably.

The main parts of the above-mentioned positioning mechanism are shown in FIGS. 3 and 4, and the positioning hydraulic cylinder 17 is located on one side of the truck 2 as described above, and the axis is located on the rolling direction line of the wheels 15. Moreover, the cylinder rod 19 is vertically installed outwardly from the wheel 15, and an engaging rod 20 with an acute angle tip is integrally attached to the cylinder rod 19 on the same axis. A spring 21 is attached concentrically to the cylinder rod 19 for biasing it downward, that is, in the direction of the rail 16. The engagement rod 20 is guided in its vertical direction by a sliding guide portion 22 provided on the truck 2, and can vertically move up and down in the direction of the rail 16. 23 is fixed to the rail portion surface 3 of the frame F, and is connected to the engaging rod 2
Engagement recess 23 with an inverted triangular cross section that engages with the lower end of 0
The positioning engaging body is arranged at the stopper support arm 11 when the carriage 2 is stopped and held by engagement with the engaging rod 20.
The axis and the converter C axis may be coaxial. As shown in FIG. 3, the rail 16 is cut off in front of the positioning engagement body 23, but a positioning stopper 24 is provided in the running direction of the trolley 2 to receive the same, and a buffer body 25 is attached to this stopper 24. Since it makes contact and stops the running of trolley 2,
The wheels 15 do not fall off the rails 16.
As can be seen from FIGS. 3 and 4, the engaging rod 20 is formed from a rectangular member with a required width, and its width is equal to that of the rail 16.
If the width is made approximately equal to the width, a braking action during running, which will be described later, can be achieved, and the tip is formed to form a required circular arc for this braking action.

FIG. 5 shows an embodiment of the hydraulic circuit of the positioning hydraulic cylinder 17, in which 50 is a tank;
51 is a pump, 52 is an electric motor, 53 is a solenoid valve, 5
4 is a stop valve that reduces the hydraulic load to the hydraulic cylinder 17 to zero in an emergency. According to this hydraulic circuit, the cylinder rod 19 is always positioned at the upper side when the bogie 2 is traveling, and when no hydraulic pressure is applied, the cylinder rod 19 is lowered by the biasing force of the spring 21 and engaged as shown in FIG. Rod 20
can extend downward. Therefore, in order to move the trolley 2 from the storage position to the working position and hold it in place by the positioning mechanism, first apply hydraulic pressure to move the cylinder rod 19 and the engagement rod 20 against the biasing force of the spring 21. Raise the engaging rod 2
0 does not contact the upper surface of the rail 16, the electric motor 14 is operated to move the cart 2 in the direction of the converter C. When the axis of the stopper support arm 11 and the converter C axis come to substantially coincide, the buffer body 25 on the front side in the running direction of the truck 2 comes into contact with the positioning stopper 24, and the truck 2 becomes unable to travel and stops at the same position. . At this time, if the running speed of the bogie 2 is decelerated to a very low speed, it is possible to prevent the bogie 2 from retreating due to bouncing in the event of a collision with the positioning stopper 24. It is sufficient to calculate the coefficient of rebound in advance so that the tip of the engagement rod 20 is at least within the upper opening edge area of the engagement recess 23a of the positioning engagement body 23. In the above relative positions of the truck 2 and the positioning engagement body 23, the cylinder rod 19 and the engagement rod 20, which reduce the hydraulic pressure in the positioning hydraulic cylinder 17 by the hydraulic circuit operation, are pushed downward by the restoring force of the spring 21, and the engagement rod 20 is pushed downward by the restoring force of the spring 21. The pointed end of 20 fits into the engagement recess 23a of the positioning engagement body 23, resulting in the state shown in FIG. 3, and the truck 2 is locked at the working position in a non-rolling state. In this embodiment, this working position is defined as the longitudinal axis of the stopper support arm 11 and the converter C.
This is a position where the table 7 is moved up and down by operating the hydraulic cylinder 4, the table and the stopper support arm 11 are moved up and down by the tilting cylinder 6, and the stopper support arm 11 is moved up and down by the arm feeding mechanism 13. can move forward and backward into the converter C and perform slag cutting work. Furthermore, in this embodiment, the tip of the engagement rod 20 is made into an acute angle shape, and the engagement recess 23a of the positioning engagement body 23 that receives the engagement rod 20 is designed so that the tip of the engagement rod 20 can be fitted in an aligned state. If so, the trolley 2 will be completely locked in place and the trolley 2 will be completely locked during work.
The converter does not swing laterally with respect to the converter axis, allowing stable slag cutting work.

After the work is completed, hydraulic pressure is applied again to raise the cylinder rod 19 and the engagement rod 20 to disengage the positioning engagement body 23 and move the cart 2 to the storage position, completing the series of slag cutting operations. .

In addition, a stop valve 54 is provided in the hydraulic circuit of the positioning hydraulic cylinder 17, which is the main part of the positioning mechanism according to the present invention, to reduce the hydraulic load to zero in the event of an emergency such as a power outage. 2. If there is a power outage due to an accident or some other cause while driving, remove cylinder rod 19.
The engaging rod 20 is lowered by the spring 21, and the lower end of the engaging rod 20 presses into contact with the upper surface of the rail 16, and the frictional force caused by the contact generates running resistance, resulting in a braking effect in which the trolley 2 is stopped. be able to. That is, this is a hydraulic circuit that normally loads hydraulic pressure to keep the engaging rod 20 in the upper position, and when the loaded hydraulic pressure is zero or the hydraulic load is smaller than the restoring force of the spring 21, the engaging rod 20 is placed in the upper position. This is based on the fact that the positioning hydraulic cylinder 17 is configured so that it descends, and in the event of a power outage as described above or a failure of a solenoid valve in the hydraulic circuit system, the positioning hydraulic cylinder 17
The hydraulic pressure that maintains the cylinder rod 19 in the upward direction decreases, and as a result, the engagement rod 20 is lowered by the spring 21 to perform a braking action.

In this embodiment, the trolley 2 is arranged to run on a frame F that is fixedly installed on the upper movable floor M, but it can be similarly arranged so that it can run using, for example, an overhead traveling crane in front of the converter C as a frame. You can also.

Furthermore, it is also possible to use a frame that is fixed to the ceiling or floor of the building.

As described above, according to the present invention, a positioning mechanism is provided that allows the main body of the slag cutting device to travel to a predetermined position in front of the converter mouth and reliably hold it at the same position, so that the slag cutting work can be performed easily and reliably. In the event of an emergency, the same positioning mechanism acts as a brake on the traveling of the bogie, which has the effect of preventing accidents in the event of an emergency.

[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 is a partially cutaway side view showing the main parts of the positioning mechanism. FIG. 4 is a view taken along the line in FIG. 3, and FIG. 5 is a hydraulic circuit diagram showing an embodiment of the hydraulic circuit of the positioning hydraulic cylinder. 1...Slag cutting device, 2...Dolly, 10...
...Stopper, 11...Stopper support arm, 17
...Positioning hydraulic cylinder, 20...Engagement rod, 2
3... Positioning engagement body, 24... Positioning stopper, C... Converter, F... Frame.

Claims (1)

[Scope of Claims] 1. A frame can be positioned on the floor in front of the converter mouth, and a trolley that can run in a direction intersecting the converter axis is disposed on the frame, and is characterized in that a stopper support arm with a stopper attached to its tip is provided so as to be movable back and forth within the converter, and a positioning mechanism is provided which engages with an engaging portion formed on the frame to hold the cart in a predetermined position. Slag cutting equipment used in converters, etc. 2. The bogie is equipped with a positioning mechanism consisting of an engaging rod that is biased by a spring in the direction of the surface of the bogie running frame and engages with an engaging portion on the top surface of the frame, and a fluid pressure cylinder that raises and lowers the engaging rod. A slag cutting device for use in a converter or the like as set forth in claim 1.