JPS6339919Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a graphite electrode, and more specifically, an identification zone is provided at both ends of the graphite electrode so that the socket forming part can be easily recognized from the outside. This invention relates to graphite electrodes that can be added to by identifying areas where the holder is prohibited from being held.

Conventionally, in electric furnaces, operations such as metal smelting have been carried out by successively joining graphite electrodes using nipples as the graphite electrodes wear out. A screw hole is provided in the axial direction on the end face of the graphite electrode as a socket part, and when joining, one graphite electrode holder is held and a part of the nipple is screwed into the socket part at one end, and the other part of the nipple is The other graphite electrode is gripped by a holder and screwed into the socket at the end of the other graphite electrode, thereby joining both graphite electrodes together. Therefore, the mechanical strength of the socket forming parts at both ends of the graphite electrode is extremely low compared to other parts. The socket forming part is destroyed or worn out,
Breakage accidents occur. From this point of view, normally, as shown in Fig. 1, a limit line 2 of approximately 25 mm width is formed on the graphite electrode 1 with white paint or the like at a portion corresponding to the socket forming part, and this limit line 2 can be recognized from the outside. It is configured like this.

However, even if a limit line is drawn at the end of a graphite electrode, electrodes are spliced and connected during metal smelting, and in particular, during electric iron making and electric steel making, large amounts of iron oxide are included. Black dust blows up and accumulates at the limit line, making it invisible. Additionally, during operation, graphite electrodes are exposed to high temperatures, which often causes the white paint on the limit lines to disappear and become invisible. Even if the threaded part of the graphite electrode is indicated by a limit line as an area that is prohibited from being gripped by the holder, the function of the limit line is not fully utilized during actual splicing, and some parts of the area where gripping is prohibited may be mistakenly performed. The product is often held by the holder, leading to breakage accidents.

The purpose of this invention is to solve the above-mentioned drawbacks. Specifically, for example, the screw hole forming part cannot be sufficiently recognized from the outside even when blown-up dust adheres in electric steel manufacturing, electric steel manufacturing, etc. or is exposed to high temperatures. Furthermore, the present invention proposes a graphite electrode in which the identification band of the socket forming part penetrates into the inside of the graphite electrode and is not easily peeled off.

That is, the present invention is a graphite electrode that has a limit line on the outer circumferential surface corresponding to the threaded bottom of the socket where the nipple is screwed, and silicon made of permeable particles on the outer circumferential surface between the limit line and the end surface. It is characterized by having an identification zone formed by applying a paint system.

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

First, FIG. 2 is a perspective view of a graphite electrode according to one embodiment of the present invention, and this graphite electrode 10 is manufactured by molding and firing into a cylindrical shape, similar to the conventional example. Sockets 11 (only one end socket is shown in FIG. 2) are formed in the axial direction at both ends of the graphite electrode 10, and nipples (not shown) are screwed into the sockets 11 when adding electrodes. . At both ends of the graphite electrode 10, limit lines 12 are formed with white paint at locations corresponding to the threaded bottoms of the sockets so that the portions where the sockets 11 are formed can be recognized from the outside.

Next, on the outer peripheral surface of this graphite electrode, an end surface 10
Apply silicone paint over the entire area from a to limit line 12 to create identification zone 13.
will be established. It is necessary that this identification zone 13 does not peel off from the outer circumferential surface of the electrode even when exposed to high temperatures, and it is preferable that a portion of the adhesive zone with the outer circumferential surface of the electrode penetrate into the inside of the electrode.

That is, the graphite electrode has a structure with some pores. For this reason, even among silicon-based paints, the particles are fine (for example, 1 to 100 mμ),
If the paint is permeable, a portion of the paint enters the electrode three-dimensionally from the outer circumferential surface, and an identification zone 13 held by this three-dimensionally penetrated portion is formed. Therefore, even if exposed to high temperatures during operation, the three-dimensionally penetrated portion will not cause the identification zone 13 to peel off at all.

Note that in order to infiltrate a portion of the identification zone 13 from the back surface into the electrode, as described above, adjust the particle size, dissolve it in petroleum solvent or water, and apply this to the outer circumferential surface of the electrode. It is sufficient to penetrate inside the electrode or into the tissue.

As explained in detail above, the present invention has an identification zone formed by applying paint between the limit line provided on the outer peripheral surface of the graphite electrode and the end surface of the electrode, which corresponds to the threaded bottom of the part forming the socket into which the nipple is screwed. It is equipped with the following.

Therefore, even if dust etc. adheres during operation, the identification range will not become invisible, and there will be no breakage accident when connecting the electrodes.Since the paint is silicone-based, It can withstand high temperatures and will not peel off.

Moreover, since this identification zone is made of permeable particles and is impregnated inside the graphite electrode, it hardly peels off.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional graphite electrode, Figure 2 is a perspective view of a conventional graphite electrode.
The figure is a perspective view of a graphite electrode according to one embodiment of the present invention. Code 10...Graphite electrode, 10a... End surface, 11
...Socket, 12...Limit line, 13...
...identification zone.

Claims (1)

[Scope of utility model registration request] In a graphite electrode that has a limit line on its outer circumferential surface corresponding to the threaded bottom of the socket where the nipple is screwed, a silicone-based paint made of permeable particles is applied to the outer circumferential surface between this limit line and the end surface. A graphite electrode characterized in that it has a discrimination zone.