JPS6340304Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Application of the Invention) The present invention relates to an apparatus for filling a nozzle hole provided in a molten steel ladle with a filler.

(Technical background of the invention) As is well known, a molten steel ladle is provided with a nozzle hole in its bottom wall for flowing out molten steel. FIG. 8 is a cross-sectional structural diagram showing one embodiment of the nozzle hole, in which 1 is a molten steel ladle (hereinafter referred to as a ladle), and 2 is a nozzle hole. As shown in the partially enlarged view of Fig. 9, the nozzle hole 2 has a sliding nozzle (hereinafter SN).
The nozzle hole 2 is opened or closed by driving the SN device 3 to open or close as shown by the arrow a. In order to store molten steel in the ladle 1, the SN device 3 is driven to close, the nozzle hole 2 is closed, and then the molten steel is injected. or,
By opening the SN device 3 and opening the nozzle hole 2, the molten steel stored in the ladle 1 can be, for example,
It flows into the mold or into the tundish of continuous casting equipment.

By the way, when the SN device 3 is opened and the nozzle hole 2 is opened, a refractory powder mainly composed of silica sand is applied to the closed nozzle hole 2 so that molten steel starts pouring out naturally. Granules are filled as the filler 4.

(Prior art and its problems) Now, as mentioned above, the nozzle hole 2 is provided in the bottom wall of the pot 1 (usually 3 to 5 m from the top surface of the pot to the bottom wall), and the inside of the pot 1 is Since the temperature was extremely high due to the residual heat of the molten steel, filling the nozzle hole 2 with the filler 4 was an extremely difficult task. For this reason, it has been disclosed in the past, for example, in Japanese Patent Application Laid-Open No. 53-99042,
As shown in Fig. 8, a chute 5 is used to guide and fill the filler 4 into the nozzle hole 2, or a filler formed in a cylindrical shape is used as disclosed in Utility Model Application Publication No. 55-43700. A method of inserting the SN device 3 from below has been proposed. However, all of the above-mentioned conventional means require large-scale devices and have extremely poor workability, so they have not been put into practical use.

In practice, the filling material 4 packed in bags of about 5 kg, for example, is dropped from the workbench 6 shown in FIG. 8 toward the nozzle hole 2 by the worker, or by using a belt conveyor. , means for continuously dropping the filler 4 near the nozzle hole 2, etc. have been widely adopted. However, with this method, a uniform packing density cannot be obtained, and there may be a situation where the nozzle hole 2 does not open even after the SN device 3 is driven open due to foreign matter used for bagging getting mixed into the nozzle hole 2 ( In addition, the yield rate of the filler was extremely poor.

(Purpose of the invention) The main object of the invention is to provide a filling device that can easily and efficiently fill the filling material even under the above-mentioned adverse environment, and also ensures the natural outflow of molten steel.

(Structure of the invention) The structure of the invention will be described with reference to drawings showing embodiments of the invention. FIG. 1 is a structural diagram showing one embodiment of a filling device 100. In FIG. 1, 7 is
The container 7 is a filler storage container (hereinafter referred to as a container), and the container 7 has an opening 8 at the bottom thereof and is provided with a hook member 9 so that it can be lifted, suspended, and transported by a lifting machine, etc., which will be described later. It is being A valve body 10 is engaged with the opening 80 of the container 7 so as to be movable up and down. A filler retaining member (hereinafter referred to as a retaining member) is attached to the valve body 10 at its lower end via a connecting rod 11.
12 are installed vertically. In this embodiment, the opening 8
The connecting rod 11 is connected to the connecting rod 11 by the support member 81 fixed to the
is supported so as to be movable up and down, and the valve body 10 is engaged with the inner wall surface 70 of the container 7.

As shown in a perspective view in FIG. 2, the retaining member 12 may be formed into a cylindrical shape with open upper and lower surfaces so that it covers the nozzle hole 2 and the filler 4 forms an optimal mountain shape. In addition, in FIG. 2, 11a is the connecting rod 1
1 and the fastening member 12. By the way, immediately after the nozzle hole 2 is laid with bricks, there is a step between it and the bottom wall surface as shown in FIG. It is common for the surface to disappear and become almost smooth. According to the experience of the present inventors, the fastening member 1
If there is a step as shown in FIG. 3, the diameter D of the nozzle hole 2 should be 1.1 to 1.5 times the step diameter d', or if there is no step as shown in FIG.
It was effective to have a size 1.4 to 2 times the outer diameter d of the upper end. Of course, there is no problem in configuring the fastening member 12 in any rectangular shape, but the aforementioned round shape is preferable from the viewpoint of manufacturability and operability, which will be described later. Next, the operation of the filling device 100 will be explained.

First, when the container 7 is lifted up as shown in FIG.
Due to its own weight, it comes into close contact with the container inner wall surface 70 of the opening 80 and closes the opening 80, so that the opening 8 of the container 7 is closed. By supplying the filler 4 to the container 7 in this state, the filler 4 is stored in the container 7. Next, as shown in FIG. 6, the container 7 is lowered, the fastening member 12 lands on the bottom wall 1a of the pot 1, and when further lowered, a gap is formed between the valve body 10 and the inner wall surface 70 of the container. The filling material 4 stored in the container 7 falls from the opening 8 as shown by arrow b, fills the nozzle hole 2, and is deposited in the retaining member 12.

FIG. 7 is a structural diagram showing an embodiment of the filling means by the filling device 100. In this embodiment, a lifting device 1 provided on a movable work deck 13 is used.
4 is configured to lift or hang the filling device 100. After lifting the filling device 100 and storing a predetermined amount of the filling material 4 in the container 7 on the work deck 13 or at a setting location, the lifting device 14 is operated to lift the filling device 100 into the nozzle hole 2. position it above. Next, the filling device 10
0 is lowered one by one until the axes of the retaining member 12 and the nozzle hole 2 are approximately aligned, and then the retaining member 12 is attached to the bottom wall 1a.
The filling material 4 is filled into the nozzle hole 2 by grounding the container 7 and further lowering the container 7 from the ground.

(Example) Using the filling apparatus 100 shown in FIG. 1, the nozzle hole 2 of a ladle (3.95 mφ x 4 m height) with a storage capacity of 185 tons of molten steel was filled with the filler 4. The diameter d of the nozzle hole 2 is 130 mφ (the outer diameter of the upper end of the nozzle brick 2a is 160 mm)
φ) The height (depth) is 330 mm, and the step diameter d′ is 350 mmφ. On the other hand, the fastening member 12 has a diameter D of 400 m.
φ (used when there is a step) and 300 mm φ (used when there is no step), configured in a round cylinder shape with a height h of 140 mm, and the lower surface of the fastening member 12 and the opening 8 are separated by a distance L.
The length of the connecting rod 11 was adjusted so that it was 270 mm.
Approximately 25 kg of filler 4 (when there was a step) and 15 kg (when there was no step) were stored in the container 7. In the conventional method of dropping the filler material 4 from the workbench 6, the amount of filler material 4 used is as high as 35 to 45 kg/time, and the occurrence rate of hole clogging reaches 5 to 10%. The work of drilling the hole in the hole 2 using oxygen or the like required a great deal of physical strain and a long time. On the other hand, in this example, there was no clogging of the nozzle hole 2 after 800 tests. Furthermore, the amount of filler 4 used was significantly reduced to 17 to 25 kg/time.

(effect) The following effects were confirmed by implementing the present invention.

The filler 4 is placed at a close distance above the nozzle hole 2 (150 to 300
mm) and is filled evenly without over-density.

The filler material 4 can be heaped up in the upper part of the nozzle hole 2 in an arbitrary and optimum shape.

As a result of the above-mentioned effects, by reducing the amount of filler 4 used and driving the SN device open, it was possible to dramatically improve the natural outflow rate at which molten steel naturally flows out.

Using a lifting device normally installed at pot repair shops, etc., filling work can be performed remotely, making the work more efficient and significantly reducing the physical burden on the worker.

As described above, the practical effects of the present invention are very large.

[Brief explanation of the drawing]

Fig. 1 is a structural diagram showing one embodiment of the filling device based on the present invention, Fig. 2 is a perspective view of the fastening member, Fig. 3,
FIG. 4 is a partial cross-sectional view of the vicinity of the nozzle hole. Fifth
6 and 6 are structural diagrams showing the operation status of the filling device, and FIG. 7 is a structural diagram showing the filling operation status by the filling device. FIG. 8 is a structural diagram showing an example of a filling operation using conventional means. FIG. 9 is a partial cross-sectional view of the vicinity of the nozzle hole. 1... pot, 2... nozzle hole, 3... SN device,
4...Filling material, 5...Chute, 6...Working table,
7... Container, 8... Opening, 80... Opening, 9...
... Hook member, 10 ... Valve body, 11 ... Connection rod,
12... Fastening member, 100... Filling device, 13...
Work deck, 14... Lifting device.

Claims (1)

[Scope of utility model registration request] A device for filling a nozzle hole of a molten steel ladle with a filler material, which includes a hanging portable filler storage container having an opening at the bottom, and a filler retaining member formed in a cylindrical shape with open upper and lower surfaces at the lower end via a connecting rod. A filling material filling device comprising: a valve body for closing an opening vertically disposed vertically, and a valve body for closing an opening vertically movably engaged with the opening of the container.