SU884906A1 - Apparatus for pulse feeding of electrode wire - Google Patents

Description

(54) DEVICE FOR PULSED ELECTRODE WIRE

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The invention relates to mechanical engineering, in particular, to the production of devices for pulsed feeding of electrode wires in automatic welding machines.

A device for intermittent wire feed, which contains the driven and driving rollers, is known. In the known device on the surface ve. The bogie roller along the generatrix has a groove of variable width, due to which intermittent feed of the electrode wire is provided,. This device does not allow to initiate an electric arc by contact with a electrode. The use of an electric motor with a gearbox to rotate pc faces increases the size and weight of the device.20

A device is known, comprising a housing in which a lever lever is installed. A magnetic device and a coil inside which a spring-loaded self-clamping clamp is fixed in the upper moving disk of the electromagnet, and the levers of the clamping device are hinged and mounted in the lower moving disk of the electromagnet.

The wire is movable in the direction perpendicular to the wire feed direction 2.

The said device also does not allow to initiate the arc by touching and spreading the electrode with the product.

A device for pulsed supply of an electrode wire is known, comprising a housing with an electromagnetic coil, inside of which a spring-loaded movable core is located, associated with the backing grab, the fixed core, which holds the grab. An electromagnetic force developed in the working gap acts on the electromagnet's bark, moving it and the gripper associated with it by the amount of the set working gap. Balls grip / clamp welding wire, it serves on a given uiai. The measles return to the opposite position under the influence of an elastic element, while the grip slips relative to the wire, which at this moment is held by the fixed grip Z.

Using such a device for pulsed supply of an electrode wire when it is melting with a low amperage arc in a protective gas environment, when the stability requirements are high and the power sources used in this case have mainly vertical or steeply dipping external characteristics, an electric arc can only be excited by the interval of an additional high-voltage and high-frequency pulse, the designation of devices for obtaining an additional pulse complicates the device and reduces its reliability ness It is impossible to excite an electric arc in such a simple and reliable way as by contact and dilution of an electrode and a part when using such a device. The purpose of the invention is to create a mechanism which, when pulsed, feeds an electrode wire, could initiate an arc by touching and dislodging the electrode wire from the part. This goal is achieved by the fact that the device for pulsed supply of electrode wire, comprising a housing with an electromagnetic coil, inside which there is a spring-loaded movable core connected to the feed grip, a fixed core that snaps the grip, is equipped with a glass that is adjustable to movement along the body, and hold the grip in the acacia is mounted in a glass with the possibility of movement by a specified amount and is spring-loaded relative to it. The drawing shows a mechanism for feeding the electrode wire, a general sectional view. The mechanism includes a housing 1 with a flap 2, inside of which an electromagnetic coil 3 is placed. Inside the coil there is a stationary heart 4, spring-loaded 5, a pivot core b, which is rigidly connected to the ball-shaped engagement 8 via a connecting tube 7 is adjusted by the cup 9.. Inside the cup 9, which closes with the crest 10 and becomes in a certain position relative to the housing lid by the nut 11, is located the dead vile grip 12, spring-loaded 13. The retention conductive grip 12 has a possibility to move to some vnutri.stakan course, the magnitude of which is bounded on one side of the lid 10, the other ac bottom cup with a hole through which some portion may extend from the capture nozzle. In the initial position, the movable core rests with its end into a glass. The mechanism works as follows. When applied to the electro-magnetic coil 3, a movable core 6 is attracted to the fixed core 4, compressing the spring 5. Together with the movable core, the connecting tube 7 moves, by means of which the feed nip 8 is rigidly connected to the core. The electrode wire is jammed in the feed grip, due to which it is fed a step equal to the distance between the moving and stationary core, which is regulated by the cup 9. At the same time under the action of the spring-. 13 and due to friction in the grip, the grip 12 moves in the cup 9 in the direction of wire feed up to the stop, and so that some of it protrudes from the cup. The wire freely passes in this case through the delayed capture. The stroke of the holding grip is equal to the value at which you need to pull off the electrode wire after touching the product in order to sustainably and reliably initiate the electric arc. After the wire is wired with the product, the automation unit removes the voltage from the electromagnetic coil. The spring 5 at the same time returns to its initial position the core 6 and together with it the gripper 8, freely sliding in the etsm movement along the wire, which due to the jamming is held in place by the delayed gripper 12. Returning to the initial position, the movable core abuts the glass 9 / lifts however, the retention gripper 12 due to contact with its protruding portion of the glass by the amount of stroke required to initiate the arc. Together with the retention grip, the wire is also jammed in it, thus exciting the arc. The possibility of initiating an electric arc by touching and retracting the electrodes makes it possible to simplify the system of exciting an electric arc and increase the reliability of its operation by eliminating the pulsed arc driver using a power source of a welding arc with a vertical or steeply dipping external characteristic. The device has a wide range of adjustment of the electrode overhang, frequency of feed and diameter of the electrode wire. It can be used to feed both hard and soft wires, and it can also be used in various devices where it is necessary to feed the wires in pulses irrespective of the designation of the burner and heating methods.

Claims (3)

Claim A device for pulsed feeding of an electrode wire, comprising a housing with an electromagnetic coil, inside of which there is a spring-loaded movable core associated with a feed gripper, a fixed core delaying gripping, characterized in that, in order to ensure arc excitation due to contact and removal of the electrode wire from parts, the device is equipped with a glass mounted with the possibility of adjustable movement along the body. and the delaying capture is mounted in a glass with the ability to move by a predetermined amount and is spring-loaded relative to it. 5 Sources of information taken into account in the examination 1. USSR copyright certificate No. 313594, cl. B 21 f 23/00, 1970. 2. USSR author's certificate No. 276282, cl. B 23 K 9/12, 1969. 3. Voropay P.M. and others. Electromagnetic mechanism * pulse feed of welding wire. Automatic welding, 1980, * 1, p. 46-48 (prototype).