SU1224120A1 - Torch for electric arc shielding gas welding - Google Patents

Description

eleven

The invention relates to welding equipment and is intended for use primarily in automatic and robotic welding in protective gas.

The purpose of the invention is to provide automatic cleaning of the burner from molten metal splashes.

FIG. 1 shows schematically a burner in a position for welding, a longitudinal section; FIG. 2 shows the lower part of the burner in the dry position of molten metal particles.

A torch for electric arc welding includes a housing 1, a current-carrying pipe 2 arranged therein, a nozzle 3 for supplying protective gas, an ejector with a nozzle 4 for supplying the working gas located concentrically on the current-carrying pipe 2, a pipe 5 for supplying the working gas installed pipe 2 concentric with it on the radial ribs 6. The nozzle 4 for supplying the working gas is rigidly fixed on the non-working end of the nozzle 3. The burner is provided with a drive 7 for moving the nozzle 3, made, for example, in the form of an electromagnet with a core 8 connected by means of the nozzle 4, and through it with the salt 3. The burner is equipped with an aspirating national nozzle 10 and a collector 11 for sucking the dust and gas extracts. The current-supplying tube 2 is used to supply protective gas to the nozzle 3. Inside it is a guide tube for feeding welding wire into the welding zone (not shown). Position 12 denotes aspiration 12 "Nozzle 3 and the current-carrying tube 2 at the interface point are made with the same direction cones and surfaces A and B,

The burner operates as follows. In the state of welding (Fig. 1), the electromagnet of the drive is energized and presses the nozzle 3 to the current-carrying tube 2 along the conical surface. An electrode wire is fed to the weld zone. At the same time, shielding gas flows into the welding zone through the current-carrying tube 2 and the nozzle 3, and working gas flows through the tube 5 to the nozzle 4.

The harmful gases and aerosols formed during the welding process are sucked through the aspiration channel 12 in the housing 1 and through the collector 11 uod02

From the welding zone, the vacuum in the aspiration channel 12 creates the energy of the working ejecting gas supplied through the tube 5 to the nozzle 4. This prevents the working gas from the nozzle 4 from entering the nozzle 4 and further into the welding zone. The hermetic separation of the internal cavities of the nozzles 3 and 4 is ensured by the fact that the contact between the current-carrying tube 2 and the nozzle 3 is made along the tapered surfaces A and B,

The working gas and removable polluted air, washing the heat-stressed elements (current-carrying tube 2 and nozzles 3 and 4), cooled them.

Before cleaning the welding torch from molten metal particles, the supply of electrode wire and protective gas to the welding zone is stopped and the actuator 7 is switched. The electromagnet of the actuator moves the magnetic core 8 upwards which carries along the nozzles 3 and 4 (Fig. 2) The nozzle 4 moves up to the stop at the end of the tube 5. At the same time, the working gas (or cleaning mixture) through tube 5 enters the mass 3, mine sop, 4 5 whose internal cavity is isolated by the end side of the tube 5 from the inner cavity of the nozzle 3, tapered j The iacTKa A of the current-carrying tube 2 provides minimal resistance to the working gas (or cleaning mixture) when it passes from the tube 5 to the nozzle 3. Due to the energy of the compressed working hectare ™, the nozzle 3 of the feed gas supply and the lower part of the conductive tube 2 are cleaned from the bottom · adhered metal particles,

Air exhaust is not sucked through the aspiration channel 12 when the burner is cleaned, since the working gas moves through the burner, - {Inu ejector.

The connection of the ejector nozzle and the nozzle for supplying the protective gas to the unit, installed with the possibility of axial movement and having a conical internal surface in contact with the corresponding external surface of the current-supplying tube, provides a controlled change in the direction of flow of the working gas, i.e. automatic cleaning of the burner from molten metal particles, which, in failure, will reduce the time of this auxiliary operation.

/,: /one

IfezaXj

W.

- - - -TiT

yl

-

d

h and

  and

Jiij

FIG. one

(Rig.2.

Red ktor i, Gul; yy: about

Compiled by G. Kvartalnova

Tehred A.Aliyev. Corrector

Zakpr 18/2/14 Circulation 1001.Subscription

VNIZhSh State KON iTera USSR

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

C m. Pyel iinn Patent., Uzhgorod, st. Gfroject, 4

Claims (2)

1. A BURNER FOR ELECTRIC ARC WELDING IN PROTECTIVE GASES, comprising a housing, an ejector with a soil for supplying a working gas located concentrically on the current supply tube, a tube for supplying the working gas installed concentrically on the radial ribs outside the current supply tube, and a nozzle for supplying a protective gas and suction nozzle, characterized in that, in order to ensure automatic cleaning of the burner from splashes of molten metal, the nozzle for supplying working gas is rigidly fixed to the idle end of the nozzle for feeding a shielding gas, a nozzle for supplying a shielding gas is made with an inner conical surface located at the non-working end of the nozzle, a portion of the current supply tube is made with an outer conical surface corresponding to the inner conical surface of the nozzle, and the nozzle for supplying a protective gas is installed with the possibility of moving in the longitudinal direction relative to the current supply tube. 2. Burner pop. 1, characterized in that it is equipped with a drive for moving the nozzle for supplying a protective gas, rods connected to this nozzle. SU. ,,. 1224120>