JPS621449B2 - - Google Patents

Description

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

A conventional slag cutting device having a structure in which a stopper support arm having a stopper at the tip extends into the converter is generally installed in the form of a jib crane, for example, on a column erected on the work floor in front of the converter. In order to move the stopper support arm into and out of the converter, as well as raise and lower it, raise it up and turn it, the support arm is pivoted or suspended by a necessary link mechanism, but the capacity and weight of the device must be large. Because of this, the structure of the link mechanism is restricted and cannot have sufficient strength. This problem is also caused by the fact that the stopper support arm is moved back and forth, raised and lowered, elevated and rotated only by a series of link mechanisms.

In a slag cutting device with such a structure, when the stopper support arm is extended, an excessive force is applied to the arm holding part, and when other turning movements are added, an unbalanced load is applied to the arm holding part, that is, the column. In addition to being dangerous, it also has the disadvantage that the stopper support arm cannot be stably moved in various ways.

The present invention was created in order to solve the above-mentioned problems in conventional slag cutting devices, and its purpose is to arrange a table that supports the main body of the slag cutting device so that it can move up and down in a fixed direction with respect to the cart. By doing so, it is an object of the present invention to provide a slag cutting device that can be operated stably without any uneven load being applied to the cart and table due to the telescopic movement of the stopper support arm.

The present invention enables a frame to be positioned on a horizontal floor in front of the converter mouth, and a table that moves up and down vertically while remaining parallel to the horizontal plane is installed in the frame, and This invention relates to a slag cutting device used in a converter, etc., which is provided with a rocking prevention mechanism for preventing rocking, and further has a slag cutting device main body attached to the same table so as to be movable forward and backward.

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 (or on a rail) 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 it to a hook H of a large traveling crane or the like (not shown) installed near the converter C. 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.

A table 4 that tiltably supports the slag cutting device 1 is connected to the lower end of the cylinder rod 3a of the hydraulic cylinder 3 vertically mounted on the truck 2 so as to be parallel to the truck 2 and the upper movable floor M, and is adapted to the expansion and contraction of the cylinder rod 3a. The table 4 can be vertically moved up and down with respect to the cart 2 and the upper movable floor M. This hydraulic cylinder 3 is a slag cutting device 1 which will be described later.
Two stopper support arms are provided at a predetermined distance apart so as to be located on the axis of the stopper support arm, which is provided so as to be movable forward and backward, or in other words, on the forward and backward direction of the arm. Furthermore, 8 is a hollow cylindrical body that is located on the line connecting the two hydraulic cylinders 3, and is similarly installed vertically on the trolley 2 adjacent to each cylinder. A guide rod 9 is arranged. FIG. 5 shows a state in which a sliding ring body 50 for guiding the guide rod 9 is provided on the truck 2, and this sliding ring body 50 is attached in such a manner that it passes through the body of the truck 2 in the vertical direction. A sliding ring 5 supports the circumferential surface of the guide rod 9 at both upper and lower ends.
1 is arranged. The cylinder 8 is connected to the upper part of the sliding ring 50, and the guide rod 9 can move up and down while being guided by the sliding ring 50 when the hydraulic cylinder 3 is operated. The guide rod 9 and the sliding ring body 50 constitute a rocking prevention mechanism G when the table 4 is raised and lowered, and the lifting direction of the guide rod 9 in this rocking prevention mechanism G is orthogonal to the main body of the trolley 2 and the upper movable floor M. In addition, they are arranged at two locations in a plane that includes the tilting direction of the slag cutting device 1, so even if an uneven load is applied to the table 4, the table 4 is supported by the guide rod 9 and will not tilt. It can be raised and lowered so as to move parallel to the trolley 2 at all times.

The slag cutting device 1 is rotatably supported midway by a driving portion 10 on the lower side of the table 4, and is pivotally supported by a cylinder rod 12 of a hydraulic cylinder 11 for tilting a stopper support arm, which will be described later. Hydraulic cylinder 11 is connected to table 4
The main body is fixed to the upper surface, and the cylinder rod 12
is connected to the slag cutting device 1 through the lower surface of the table 4 through an insertion hole 4a formed in the table 4. If the hydraulic cylinder 11 is operated with the above configuration and the cylinder load 12 is expanded and contracted,
The slag cutting device 1 can be tilted using the pivot portion 10 as a rotational fulcrum.

In the following, regarding the slag cutting device 1, 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 so as to be movable forward and backward, and a stopper support arm 14 on the arm guide tube 15. It consists of an arm feeding mechanism 16 that feeds out the attached stopper support arm 14 into the converter C so that it can move forward and backward. This arm feeding mechanism 16 is driven by a drive motor 17 attached to the upper surface of the arm guide tube 15, 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 rotates when the pinion engages with the worm 19, and the stopper support arm 1 rotates when the pinion engages with the 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 run until the axis line of the stopper support arm 14 and the converter furnace C axis line are aligned and 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, the arm feeding mechanism 1 is moved so that the stopper 13 is located inside the converter to close the tapping port E of the converter C.
The slag cutting operation can be carried out by extending the stopper support arm 14 using the hydraulic cylinder 3, lowering the table 4 using the hydraulic cylinder 3, and tilting the slag cutting device 1, ie, the stopper support arm 14, downward using the hydraulic cylinder 11.
FIG. 6 shows a state in which the table 4 is lowered and the stopper support arm 14 is tilted downward, and as mentioned above, the table 4 is guided by the guide rod 9 and the sliding ring 50 of the truck 2. It can vertically descend while moving parallel to the trolley 2 and the upper movable floor M, and there is no unnecessary rocking movement.
The cylinder rod 3a of the hydraulic cylinder 3 can also be smoothly extended. When the table 4 is lowered, the stopper support arm 14 is extended by the arm extension mechanism 16, but since the weight of the stopper 13 is relatively large due to this arm extension, the table 4 is attached to the hydraulic cylinder 11 in the figure. It receives an unbalanced load such that the load is applied to the side. However, the table 4 is supported by the guide rod 9 on the trolley 2 in such a way that it cannot tilt in the direction in which the stopper support arm 14 extends, so the table 4 does not tilt, and the guide rod 9 supports the table 4 even if it receives an uneven load. Therefore, no bending force is applied to the hydraulic cylinder 3 and its cylinder rod 3a, and the cylinder and rod will not break.

As described above, the hydraulic cylinder 3 can be operated without any problem even when the stopper support arm 14 remains extended, so that the stopper 13 can be raised and lowered in the converter smoothly and reliably by raising and lowering the table 4.

After the work is completed, the hydraulic cylinders 3 and 11 are operated to retract the cylinder rods 3a and 12, and the arm feeding mechanism 16 is reversed to move the stopper support arm 14 back from inside the converter C, and the trolley 2 is then moved. When the slag is brought to the storage location shown in FIG. 2, a series of slag cutting operations are completed.

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, the slag cutting device according to the present invention has the following effects due to its configuration.

(1) Since a rocking prevention mechanism is provided, the table does not make unnecessary rocking movements when the table is raised and lowered, allowing stable and smooth raising and lowering movements.

(2) Even if the table receives an unbalanced load, the rocking prevention mechanism can support the table without tilting it, so the elevating mechanism etc. will not be damaged.

[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 showing the main parts of the slag cutting device, FIG. 5 is a partially cutaway front view of the rocking prevention mechanism, and FIG. 6 is a side view showing the stopper support arm extending into the converter and tilting downward. FIG. 1...Slag cutting device, 2...Dolly, 4...
Table, 13... Stopper, 14... Stopper support arm, C... Converter, F... Frame, G...
...Anti-swing mechanism, M...Upper movable floor.

Claims (1)

[Scope of Claims] 1. A frame can be positioned on a horizontal floor in front of the furnace opening of a converter, and a table is installed within the frame that moves up and down vertically while remaining parallel to the horizontal floor,
A slag cutting device for use in a converter or the like, characterized in that a rocking prevention mechanism is provided to prevent rocking as the table moves up and down, and a slag cutting device main body is attached to the table so as to be movable forward and backward. 2. The converter etc. according to claim 1, wherein the table and the rocking prevention mechanism are attached to the frame via a truck that can run on the frame in a direction intersecting the axis of the converter. Slag cutting device used.