SU1219291A1 - Device for pulsed feed of welding wire - Google Patents

Description

The invention relates to semi-automatic and automatic arc welding with melting wire, in particular, to devices for pulsed feeding of welding wire.

The purpose of the invention is to simplify the design and reduce its mass.

FIG. 1 shows a longitudinal section of the device; in fig. 2 - then the general view.

The device consists of a housing 1 in which an annular floor element 2 is installed, made of an elastic material. The outer surface 2 of the element 2 is fixedly mounted on the housing 1. At the point of contact of the circles, the sleeves 3 with calibrated holes are located in the shell of the element 2. In the hole of the element 2 there is a collet 4, the outer surface of the lower part of which is coupled in the working cycle the inner annular surface of the element 2. The collet 4 moves along the bushing 5, its mounting surface for providing centering during the assembly process is made conical. In turn, the neck of the housing 1 has an annular surface of the reverse cone. On the upper part of the collet 4, a nut 6 is installed along the thread with a smooth external cylindrical surface. A washer 7 is mounted on the bottom surface of the guide sleeve 5, and a spring 8 is located between the nut 6 and the washer 7. The upper part of the collet 4, the nut 6, the washer 7 and the spring 8 are closed by a cup 9, the upper part of which is screwed on. The locking balls 11, which are pressed against the inner conical surface of the gripping head by the spring 12, are placed in its internal cavity. The flange of the glass 9, together with the guide sleeve 5, is pressed against the body 1 with a cap nut 13.

The upper part of the gripper head 10 is connected to a rubber hose 14 with an internal coil 15 forming a channel for passing the wire 16 from the cartridge or from the coil during welding. The hose is installed with a bayonet clamp formed by the pins 17 and the slots of the hose shell 18. Bottom case 1 is closed with a copper washer 19 with a copper sleeve 20, in which a 191912 end is screwed in the center

a stroke tip 21, for example of a saucer type. A nozzle 22 is installed on the outer surface of the sleeve 20 to form a gas shield at

- welding.

The washer 19 through the limb 23 is pressed against the clips 24 by means of spring wire frames 25 to the housing 1. In FIG. 2 device packaged

0 by a handle 26 within which the electrical cable and gas hoses supply a protective environment. The electrical cable is connected to the washer 19, one gas hose is connected to the cavity of the annular hollow element 2 through the wall of the housing 1 at the point of attachment of the element 2, the other - directly to the cavity. housing 1.

0 The device operates as follows.

The protective gas mixture, adjusted for flow by cranes 27 and 28, falls into the cavity of housing 1 and

5 the cavity of the annular hollow element 2. Before the start of the working stroke of the collet 5 under the action of the spring 8 is in the extreme upper position determined by the resistance of the element 2. The inner surfaces of the element 2, formed by two circumferentially tangent circles, are closed along the annular surface between themselves, calibrated bores of the sleeves 3 are thus isolated from the cavity of the housing 1, in which the gas protective medium is also located. The pressure inside the annular element increases, it deforms to the collet 4, and in the first stage of this deformation the wire 16 is clamped to the inner surface of the collet 4, with the subsequent deformation of the collet together with the wire is fed down by the amount of the selected pitch. Touching the end of the wire of the product and melting part of the wire. At the end of the working stroke (the lower extreme position of the collet 4 shown in Fig. 1), the calibrated

 the openings of the sleeves 3 and the protective gas are thrown through them into the cavity of the housing 1 and then along with the gas there through the slots of the collet 4 enters the lower cavity of the housing

5 1 formed by the bottom of the collet 4, part of the inner ring of the element 2 and the plane of the washer 19. Then through the holes in the sleeve 20, simultaneously cooling

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it, expires laminar flow into the cavity of the nozzle 22, providing protection of the weld pool.

When protective gas is ejected through the calibrated orifices of the sleeves 3, the pressure in the cavity of the annular element drops sharply, the collet 4 opens the petals, a gap is formed between the wire 16 and the collet 4, and the zag under the action of the spring 8, not coming out of contact with the inner annular surface of the element 2, moves up along the wire fixed by locking balls 11, which, moving along the conical surface of the internal cavity of the gripping head 10, do not allow the wire to move upwards. At the same time, the element 2 is deformed; its inner surfaces, formed by two tangent circles, close and isolate the calibrated openings of the sleeves 3, the pressure in the cavity of the element 2 increases and the cycle repeats.

The proposed device has the following advantages: low weight (main parts - body 1, ring element 2, collet 4, guide sleeve 5, washer 8, cup 9, gripping head 10, can be made of non-metallic materials)) element shape and uniform transmission of force to the collet during its deformation (on a prototype of an element made of rubber sheet, forces of 2-4 daN were obtained at a gas pressure of 0.01-0.02 MPa), the simplicity of setting

19291Л

and adjusting the cycle parameters - the magnitude and frequency of the stroke The coarse adjustment is carried out, with the number of working sleeves 3 with calibrated holes, some of them can be plugged, or by compressing the spring 8.

Fine adjustment is performed by the flow rate of the gas mixture by the taps.

10 27 and 28, moreover, the greater the residual pressure in the cavity of the annular element 2 and the smaller the difference between this pressure and the pressure in the cavity of housing 1, the greater the hour) 5 cycles of working cycles - pulsation of the wire movement, the less their stroke - the amount of movement collet its extreme positions.

In addition, the proposed device. characterized by compactness and simplicity of design. The device can be reduced in height by decreasing, for example, the height of the guide sleeve 5, since the stability of the direction of movement of the collet 4 can additionally be ensured by eliminating the gap between the outer surface of the washer 6 and the inner surface of the sleeve 9.

The proposed device is also characterized by noiselessness and non-impact operation. The stroke of the collet 4 is selected such that the collet does not come into contact with either the shank 19 or the gripping head 10, and the drive of the devices is a flexible element that is deformed during each working cycle by the pressure of the gaseous medium.

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Claims (2)

DEVICE FOR PULSE FEEDING OF WELDING WIRE, comprising a housing in which a spring-mounted collet is mounted, a wire grip and a drive, characterized in that, in order to simplify the design and reduce its weight, the drive is made in the form of an annular hollow element filled with a working gas protective mixture, and pressure regulators, while the outer contour of the cross section of the annular hollow element is the common part of two intersecting circles minus one of the parts, including the upper intersection point of these circles and cut off by arcs of two other tangent circles of large radii lying on one side of their tangent point located close to the center of gravity of the formed section of the ring element, and pressure regulators located in the form of bushings with calibrated holes are located at the geometrical place of the tangent points of the second circles, the outer surface of the annular hollow element is fixed to the housing, the collet is located in its hole with the possibility of interaction of its outer surface with the surface thu annular hollow element. 219291 decrease in its mass. 1 shows a device, a section; in FIG. 2 - the same, from the housing 1, the annular hollow