SU71228A1 - A method of making coal for an electric arc - Google Patents

Description

The carbon electrodes used for electric arc lamps are usually tubular in shape and are filled inside with a wick with a mass that contributes to the improvement of the mount} or electric arc. The process of filling the made and baked coals of the wick mask is to be completed. that the mass is introduced at room temperature under pressure into the channel of the carbon tube, after which the electrode is dried and then, if necessary, copper coated.

However, due to the shrinkage of the fitpal mass during the drying process, a gap is often formed between the hardened wick and the smooth wall of the tube channel, which weakens the fastening of the cloth in the carbon sheath, which leads to the deterioration of arc burning.

According to the invention, a method for producing coal is proposed. Including that, in order to prevent the formation of shrink holes, the coal tube is heated to a high temperature before filling the wick mass either directly in the furnace, or using a hot metal rod inserted into it, or passing through her electric current.

FIG. 1 shows a sectioned carbon electrode filled with a wick mass in the usual way; in fig. 2 - electrode, filled but the proposed method.

The proposed method is carried out as follows.

In the channel of the heated coal group 1, a wick mass 2 is pressed by conventional means using conventional methods. Heating of the coal tube / is carried out in various ways. In the simplest case - in a conventional muffle furnace. It is possible to heat the carbon tube with noMOUui silver or steel heat-resistant rods inserted into the wick channels of the pipes. It is also possible to heat the carbon tubes with an electric current passed through a metal rod LH, passing through the coal tube through the channel. With the flesh;: severe; are located horizontally. and carbon tubes are supported by two prisms to prevent branching of the current and the current bw in them by two prisms, separately controlling the height of the current, and the installation of the prisms is adjusted in height until the minimum value of the current R chain-heaters is obtained.

As a result of the heating of the wall of the wick channel, the temperature is sufficient to quickly solidify the wick mass 2 of this composition. Therefore, on the channel wall, the wick firmly with the thin film 3 of the hardened wick mass firmly, and the remaining mass, which retains plasticity, fills the entire volume of the wick channel, firmly adheres to the rough surface of the hardened film, as shown on. FIG. 2

FIG. one

PREDEME-I and 3 O r ete e and u

A method of making electric arc coals by filling the coal tube with a wick mass, characterized in that, in order to prevent shrink holes in the wick mass, the coal tube is heated to a high temperature either directly in a muffle furnace or by using it has a hot metal rod or the way electric current passes through it.

FIG. 2

C / f0.1 o. and wicker