SU1375420A1 - Electrode holder for underwater electric oxygen cutting - Google Patents

Abstract

The invention relates to welding and cutting, in particular to devices used in subsea gas, cutting with a tubular electrode. The aim of the invention is to improve the reliability of the e, the sector-holder and the productivity of labor. D.: There is an internal recess 9 in this area, and in Heii it is divided into a teeloiso, Iruyunya BI, extracted from a PCB with a central hole through II. er, tectrode. In I) it has a collar bore at the end 12. in the KOTopoii there is a change of rubber rubber. incp (kolyki 13, u11lotn yun1a torei tubular e, 1kt.po.ia.Thanks to this. younio nnu, rodertodertel gasket 13 never overheats above the available temperatures. even when you cut, under water, META1. ININO U) 1 (10 1 5U at max.,; 1 currents, dosgigaunshh values 350-400 A. 1 zn ff, 1y .. 1 and ;;. (L with

Description

/

from cd 4 ;; tc o

The invention relates to welding and cutting, in particular to devices used in gas-electric subsea cutting with a tubular electrode.

The purpose of the invention is to increase the reliability and productivity of work when working with an electrode holder under water by eliminating the causes of failure of the sealing rubber gasket and ignition of the body of the clamping head made of an electrically insulating material.

The drawing shows the electrode holder, general view.

The electrode holder comprises a housing 1 with an internal channel 2 for supplying oxygen to the tubular electrode 3. An oxygen valve 4 is mounted on the electrode holder housing and a clamping head 5 is fixed inside which is mounted a current-conducting sleeve 6, connected to the cable 7 that is suitable for the holder and pressed the head 5 with a nut 8. In the conductive sleeve 6 there is an internal recess 9 in which a heat insulating sleeve 10 is installed with a central through hole 1 1 under the electrode. The heat insulating sleeve 10, in turn, has an annular recess 12 at the end, in which a rubber gasket (ring) 13 is placed, sealing the end of the tubular electrode 3. The heat insulating sleeve 10 is installed in the recess 9 of the conductive sleeve 6 so that the upper end of this sleeve fits tightly over the entire surface to the end 14 of the inner hole of the head 5 for the conductive sleeve 6. The oxygen valve 4 has a hand lever 15, with the help of which the valve is opened and oxygen is supplied to the tubular electrode 3.

Work with the electrode holder under water is carried out as follows.

The cutter-diver inserts the tubular electrode 3 into the sealing gasket 13 against the stop. Upward with one hand, the electrode into the gasket 13, the diver clamps it with the flywheel 16 with the other hand. The driver then takes the electrode holder with the electrode to the place of direct cutting under water, presses the lever 15 and thereby supplies oxygen through the tubular channel of the electrode 3 to the cutting zone. After that, the diver gives the command to turn on the current and the end of the electrode initiates an arc on the product being cut. In the process of cutting under water, even at maximum currents exceeding 300-350 A, the gasket 13, sealing the end of the electrode 3, does not overheat beyond the permissible temperatures due to the heat insulating sleeve 10 in which the gasket 13 is installed.

The proposed electrode holder may have several embodiments, differing only from one another.

0

five

0

five

0

The rial of which the heat insulating sleeve is made. For its manufacture, materials that are poorly heat-conducting materials such as textolite, thermosetting plastics of the grades AG-4B or AG-4C, fluoroplastic, glass fiber textolite, etc. can be used. However, a material with optimal properties for ensuring the thermal insulating properties of the sleeve is textolite. It is an excellent thermal insulator and can work for a long time in seawater. In addition, the PCB is easily machined and has high dielectric properties.

The presence in the proposed electric holder of a heat insulating sleeve made of a textolite eliminates direct contact of the rubber gasket sealing the electrode with the body of the conductive sleeve heated by passing electric current when performing cutting under water reduces the heat flow to the gasket from the specified bushings and thereby significantly reduces heating of the gasket. In the proposed electric holder, the sealing gasket is heated only by contact with the end of the electrode. At the same time, the heating temperature of the gasket does not exceed 30--35 ° C, which ensures a longer life of the holder in connection with the elimination of the main cause of the holder head fire during operation under water, less oxygen consumption per meter of cutting under water, a significant increase in productivity underwater cutting by eliminating the need for frequent change of gasket, sealing the end of the electrode, and lifting the electrode holder from the water to the surface to do this work; the ability to perform a single electrode holder, without leaving it out of order, a virtually unlimited cutting volume under water; the possibility of cutting with the same and the same electrode holder m both under water and on the surface (in the latter case without additional cooling).

Claims (1)

Invention Formula I. Electrode holder for underwater electro-oxygen cutting, containing a core 50 with an oxygen supply channel, a clamping head with a conductive sleeve and a rubber sealing gasket to seal the end of the tubular electrode, characterized in that, in order to increase reliability and performance, the electrode holder is equipped with a heat insulating sleeve with an annular recess at the end, the conductive bushing is made with an internal recess to accommodate the heat-insulator 1375420, 3 rubber sleeve, and rubber gasket2. The electrode holder according to claim 1, is disposed in the recess of the heat insulating material in that the heat insulating sleeve of the sleeve is made of a PCB.