JPS621199B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a slag removal device for removing slag attached to the inner surface of the furnace wall of an induction melting furnace.

In recent years, electric melting equipment using induction heating has been widely adopted for melting steel materials and non-ferrous metal materials due to pollution problems, labor savings, and improvement of the working environment.
Another great advantage of induction melting is that the molten metal can be of high quality because of the stirring action. However, although induction melting melts in a short time, the molten metal comes into contact with the atmosphere during melting and oxidizes. In addition, impurities contained in the molten metal material become slag, and this slag is turned into molten metal by the stirring action. It gets caught up in the inside of the furnace and adheres to the inner surface of the furnace wall. For this reason, when melting operations are repeated, slag adheres to the furnace wall one after another, forming a thick film. This slag adhering to the inner surface of the furnace wall not only reduces the volume inside the crucible and reduces the melting capacity, but also increases the distance between the molten metal and the heating coil, reducing melting efficiency. A worker stands on the top of the furnace wall with a scoop-like tool in hand to remove the slag that has adhered to the inner surface. This has the disadvantage that workers must be exposed to high-temperature and dangerous work, and the work cannot be done efficiently because it is done manually.

The present invention eliminates the above-mentioned drawbacks, eliminates the need for workers to get close to the molten metal, and provides a slag that can safely, efficiently, and reliably remove slag attached to the furnace wall without exposing the workers to danger. The purpose is to obtain a removal device.

An embodiment of the present invention will be described below with reference to the drawings.

1 to 3, it has a refractory material 1a and a heating coil 1b for constructing a crucible. On the induction melting furnace 1 and its upper part, the furnace wall scrapers 3, 3' and the rods 3a, 3a' with these attached to the tips are connected to the rods 4 of the cylinders 4, 4' using connecting fittings 3b, 3b'.
a, 4a', and the cylinders 4, 4' are fixed to mounting brackets 5, 5' attached to hinges 7, 7' with pins 7a, 7a'. The hinges 7 and 7' are the lifting frame 6
At the same time, one end is fixed to the elevating frame 6 and the pin 8.
a hinge 9 at one end on the opposite side of the cylinder 8, 8' having hinges 8a, 8a' connected by b, 8b';
By connecting the cylinders 9' with pins 9a, 9a', the furnace wall scrapers 3, 3' can be tilted as shown by the chain lines in FIG. 1 by setting the cylinders 8, 8' to the backward limit. Furthermore, the elevating frame 6 is a fixed mounting frame 11.
It is connected to a rod 10a of a cylinder 10 attached to the cylinder 10, and is raised and lowered by the operation of the cylinder 10. The cylinders 4, 4', 8 mentioned above,
The same operation can be performed by using screws instead of 8' and 10.

Next, the operation of the present invention having the above configuration will be explained.

4 to 8 are diagrams showing the operational sequence of the present invention. As shown in FIG. 4, by setting the cylinder 10 fixed to the mounting frame 11 to the backward limit, the elevating frame 6 connected to the rod 10a of the cylinder 10 is in the raised position, and the elevating frame 6 and the mounting bracket 5, The cylinders 8, 8' connected to the mounting brackets 5, 5' are moved to the forward limit, and the mounting brackets 5, 5' are tilted, and the cylinders 4, 4' fixed to the mounting brackets 5, 5' and the connecting brackets 3b, The rods 3a and 3a' of the furnace wall scraper 3 connected by 3b' are also shown in a tilted state. Then, when the cylinder 10 fixed to the mounting frame 11 is moved forward, the rod 1 of the cylinder 10 is moved forward.
The elevating frame 6 connected to 0a is lowered to the state shown in FIG. 5. From the state shown in Figure 5, cylinder 8,
When the furnace wall scrapers 8' are moved back, the furnace wall scrapers 3, 3' come into contact with the inner wall 1d of the refractory material 1a, as shown in FIG. At this time, by adjusting the inner diameter of the cylinders 8, 8' and the pressure applied thereto, the refractory material 1a of the furnace wall scrapers 3, 3'
The contact pressure against the inner wall 1d of the refractory material 1a can be adjusted as desired, and the compressive force applied to the refractory material 1a can be adjusted.
When the rod 4a of the cylinder 4 is moved backward from the state shown in FIG.
While scraping it off, it descends along the inner wall 1d, resulting in a state as shown in FIG. Then, by advancing the rod 4a of the cylinder 4, the furnace wall scraper 3 is raised, and then the rod 4a' of the cylinder 4' is retreated to lower the furnace wall scraper 3' to achieve the state shown in FIG. The slag 2a adhering to the inner wall 1d of the material 1a is scraped off. From the state shown in Fig. 8, reverse the operation shown in Figs. 6-5-4 to scrape the furnace wall 3,
Raise 3'. What has been described above is the case where there are two furnace wall scrapers 3 and 3' each, a total of four furnace wall scrapers, as shown in Fig. 9, and the number of furnace wall scrapers is the inner diameter of the cylinders 4 and 4'. That is, the same effect as the present invention can be obtained no matter how many cylinders are used depending on the pushing force of the cylinder. It goes without saying that the action of the present invention will be even more effective if the furnace wall scraper is shaped so that the part that touches the furnace wall protrudes as shown in Figure 10, making it easy to remove slag. .

As described above, according to the present invention, a tiltable furnace wall scraper and a device for raising and lowering the furnace wall scraper are provided, and the furnace wall scraper is used to scrape off slag adhering to the inner surface of the furnace wall, so that an operator can remove the molten metal. It is possible to obtain a slag removal device that can safely, efficiently and reliably remove slag attached to a furnace wall even if one does not get close to the furnace wall.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing one embodiment of the present invention, and FIG.
The figure is a sectional view taken along the - line and viewed in the direction of the arrow, Figure 3 is a view in the direction of the Y arrow in Figure 1, and Figures 4 to 8 are
9 is a schematic plan view showing the arrangement of furnace wall scrapers, and FIG. 10 is a perspective view of the furnace wall scrapers. 1...Induction melting furnace, 1b...Heating coil, 1d
...Inner wall (of 1a), 2...molten metal, 2a...slag, 3, 3'...furnace wall scraping, 4,4'...(pushing) cylinder, 4a, 4a'...(4,4 ′
) Rod, 5, 5'...Mounting bracket, 6...Elevating frame, 8, 8'...(Tilt) cylinder, 10
...Cylinder (for lifting and lowering), 11...Mounting frame.

Claims (1)

[Claims] 1. A furnace wall scraper that is tiltable and is immersed in the molten metal of the induction furnace and scrapes off slag adhering to the inner surface of the furnace wall, a tilting device that tilts the furnace wall scraper, and a lifting device that raises and lowers the tilting device. slag removal equipment.