SU48929A1 - Device for automatic feeding of electrode wire during arc welding - Google Patents

Description

Until now, arc automata were built with power supply to both the arc and the automaton mechanisms from the direct current network. Even in those cases when the arc was powered from the AC network, this current was rectified for control (relay, solenoids, motors). The proposed apparatus is fully powered by the secondary winding of the welding transformer. According to the invention, in the proposed arc-type machine, a collector motor is used as an electrode wire feed motor, which with the help of a contactor opening or short-circuiting the brush can work in a repulsion or serial mode, with the corresponding activation of the core windings and excitation, as well as the direction of shear brushes neutral, you can get the reversal of the core in the transition from one mode to another.

When the engine is in serial mode, it pulls back the electrode, while it is working as a repulsion engine, when short-circuiting the core windings, it delivers the electrode to the welding site.

The ignition contactor serves to excite the arc and its winding is connected in parallel with the arc. The contactor is designed so that its measles is pulled as during idle &; and when burning arc from arc voltage. The anchor disappears from the core only when the electrode is short-circuited with the product.

The invention is explained by examining the operating conditions of the electrode wire feed engine in three basic modes, and namely, at idle mode (Fig. 1), short circuit mode (Fig. 2) and welding mode (Fig. 3).

When idling, the voltage supplying the ignition contactor coil 5 is increased and its measles 6 is attracted to the core (Fig. 1). At the same time, the contact plate /, fastened to the core 6, closes the contacts 2 and 3, so that the measles of the electrode supply motor 7 through the contact plate / and through contact 2 is short-circuited, and the excitation winding through contact 3, is fed from the terminals wives, idling. The engine is in repulsion mode. The brushes are shifted so that in the repulsive mode the motor delivers the electrode to the product.

In case of contact of the electrode with the product, that is, during a short circuit

(Fig. 2) the voltage supplying the coil of contactor 5 is zero, its measles 6 disappears from the core and the contact plate / closes with contact 4. The brushes are open, and the motor is powered directly from the secondary winding of the transformer. the voltage of which is almost equal to the idling voltage, and the motor is in serial mode, i.e., the current passes successively through the field windings and the measles. In serial mode, as indicated above, the measles change the direction of rotation and tear the electrode away from it.

With the separation of the electrode from the product, i.e. during welding {FIG. 3), a volt arc arises between them. Due to the voltage across the arc, the coil of contactor 5 passes through the coil of the pulley to the core, closes the contact plate / with pins 2 and 5. The motor 7 will again be turned on in a repulsion mode with power parallel to the arc. The anchor again changes its direction of rotation and starts feeding the electrode to the product.

The rotational speed of the engine 7 is adjusted and adjusted by the rheostat 8 so that at a given current and arc voltage it is equal to the speed of combustion of the electrode.

The length of the arc is maintained automatically, due to the property of the engine at a constant torque, to rotate speed in direct relation to the power supplying it.

Thus, with an involuntary elongation of the arc, the rotational speed of the motor increases and the arc begins to contract. However, as the arc length is shortened, the engine speed will drop until an equilibrium is established between the speed of rotation of the engine and the speed of burning the electrode.

Similarly, the arc length will be restored if it is accidentally shortened.

In the proposed device, in addition to the electrode feed mechanism, the carriage feed is fully automated, i.e.

the carriage motor only rotates when the arc is burning.

This is achieved by switching on the motor 9 for moving the product or carriage or contactor //, including the carriage motor, parallel to the winding of the jet coil 10, through the contact plate / and contact 3 of the contactor 5.

When idling (Fig. 1) through the reactive coil 10 is a relatively small current; the voltage on the engine 9 of the carriage is low and it does not rotate at this voltage. During a short circuit (Fig. 2), although the voltage on the reactive coil is high, as a result of the opening of the contact plate 7 with contact 3 and its closure from contact 4, the carriage motor 9 will be short-circuited and will not rotate again. Only when welding (Fig. 3), when the carriage motor 9 is connected parallel to the jet coil and the voltage on the latter is high enough, will it begin to rotate and move the carriage,

The subject matter of the invention.

Claims (3)

1. Device for automatic feeding of electrode wire during arc welding using reversing of an electric motor to change the direction of electrode feeding, characterized in that a serial repulsion motor, a pull-back electrode when it is used in a series mode, and feed the electrode to the welding point during operation, is used as an electric motor it as a repulsion engine when short-circuiting its core windings. 2. The form of the device according to claim 1, differing from the fact that a contactor (relay) is used for short-circuiting the core winding, the winding of which is connected in parallel to the arc. 3. In the device according to claims. 1 and 2, the motor is turned on to move the product or carriage parallel to the jet coil in the welding current circuit, in order to obtain the supply of the product or carriage only during the flow of welding current. to the author's certificate of A.V. Shapiro No. 4в§ C} 3ig.1 ifig 2 I