DE420037C - Electric seam welding machine - Google Patents

Description

The present invention relates to such electric seam welding machines which the movement of the welding pieces in relation to the welding electrodes is gradual takes place, be it with permanently closed, for example roller-shaped electrodes or in the case of such electrodes, one of which is point-shaped, the other of which is shaped like a roller and stands out from the workpiece after each individual weld. The advance of the welding piece was in such Machines previously made in a mechanical way, what a special power drive and requires a relatively cumbersome mechanical arrangement.

The invention aims to simplify the feed mechanism in such Welding machines and achieves this mainly by the fact that the step-by-step Feed is effected directly by a positively controlled electromagnet.

The solenoid can be switched on either by an auxiliary contact done by the mechanism that actuates the linkage of the machine or it can turn on the electromagnet after the welding influenced by a welding current interrupting the primary current automatic switch.

In the drawing, two different exemplary embodiments are identified Arrangement shown schematically in Fig. 1 and 2.

In Fig. Ι the welding device consists of a lower welding roller i on which the workpiece is moved forward while the upper electrode 2 is roughly in shape a point electrode is formed and with the help of the upper arm lift lever 3 in otherwise known Way opened and closed by a crank mechanism 4 with the mediation of the push rod 5 and the compression spring 6 will. On the push rod 5 is also a primary flow of the machine closing Switch 7 arranged in a known manner. The crank 4 is driven by a belt pulley through intermediation a clutch 8, which is disengaged by a bolt 9 as soon as this against the stop lever 10 pushes, which in turn is pivoted out by an electromagnet 11 can be.

A bolt 12 is also arranged on the clutch disc, which when the Coupling takes the contact spring 13 along part of its way. This opposite is a contact 14, which is connected to the solenoid 15 in connection. In this one moves Iron core 16, which actuates the tie rod 18 by an angle lever 17, which in turn by means of a pawl 19, the ratchet wheel 20 is able to rotate through a corresponding angle. The latter is connected to the welding roller 1 by a bevel gear mechanism. On the upper arm the welding machine has an iron package 21 that works in a known manner, whose auxiliary winding 22 is connected to the solenoid 23, inside which there is a known Way iron core 24 provided with air damping moves. The contact lever 25 is located at the upper end of the solenoid with respect to the auxiliary contact 26, which is connected to the solenoid 27, whose Iron core in turn actuates the contact lever 28 with respect to the contact 29. 30 and

31 are the power supply contacts, while

32 represents the primary coil and 33 the secondary coil of the welding machine.

The welding process is as follows:

As soon as the welding electrodes are closed after the upward travel of the crank 4, is by the trigger 9, which strikes against the contact lever 10, the clutch 8 triggered, so that the drive mechanism of the linkage is at a standstill. Shortly before that, the one on the linkage attached switch 7 closed, so that the primary current. For example from Mains connection 31 via contacts 7 to the primary coil and from here via contact 29 flows back to the mains connection 30. The welding takes place, and under mediation of the iron package 21, an auxiliary current is generated which excites the solenoid 23, whereby in a known manner the iron core 24 at the end of its upward movement the contact lever 25 with the contact 26 brings into contact, so that the opening coil 27 receives current and the contact lever 28 lifts off the contact 29, whereby the weld is terminated. At the same time, however, the electromagnet 11 receives current via the contacts 25 and 26, so that the locking lever 10 is pivoted out and the clutch is released. This rotates continue in the direction of the arrow, the pin 12 the contact spring 13 against the contact 14 a short part of its way. This causes solenoid no turned on, which pulls the iron core 16 down and through the mediation of the

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Angle lever 17 and the pull rod 18 dem Ratchet wheel 20 granted a certain angular rotation, which feeds the workpiece by the welding roller 1 results. The feed is determined by the appropriate choice of Setting of the pull rod 18 or the stroke of the iron core 16 is adjustable. As soon as the Contacts 14 and 13 released by the bolt 12 are, the iron core 16 is back by the action of a return spring pushed up against an adjustable stop, causing the mechanism in its Initial position device. In the meantime, the downward movement of the push rod 5 was the Switch 7 opened, so that the coils 11 and 27 were de-energized and the contact lever 28 or the locking lever 10 have returned to their initial position. In the further episode If the push rod 5 is moved upwards again, the electrode 2 sits on the Welding piece on, the bolt 9 strikes against the locking lever 10 and thereby releases the coupling off, while the switch 7 was closed again shortly before, so that the next Funct can be welded.

In Fig. 2, the upper electrode roller 34 is in a similar manner by a ratchet 35 with With the help of the angle lever 36 and the iron core 16 gradually movable. The sink 15 is parallel to the opening coil 27 of the automatic switch, which in turn by a solenoid 23 is controlled, which with the help of an auxiliary iron package 21 with the secondary circuit the welding machine is inductively coupled. In the way of the angle lever 36 is a contact spring 41, which is usually with the contact 42 is in contact. The process here is as follows:

As soon as, for example, the electrode rollers are under pressure in a known manner through the foot lever of the welding machine and the primary circuit has been closed by the switch 7 attached to the foot lever of the machine, the welding current begins, for example, from the mains pole 30 via the switch 7 to the primary coil and from here via the contacts 29 and 28 to flow back to the network pole 31. The secondary coil 33 of the machine is energized and the welding process begins. In a similar manner, as previously described, the automatic switch is operated by the auxiliary package 21, and after completion of the weld, the contacts 25 and 26 are closed, so that now the switching coil 27 opens the contacts 28 and 29, whereby the weld is completed . At the same time, however, the magnet coil 15 also receives current via the contacts 25 and 26, as a result of which the iron core 16 is pulled down and the ratchet wheel 35 and the roller 34 are moved by a certain angular rotation in the manner described above. As a result, the welding piece is pushed forward by one point distance between the rollers 43 and 34 \. Simultaneously with the downward movement of the iron core 16 5s, the angle lever 36 lifts the contact 41 from the contact 42, so that the circuit of the coil 15 and 27 is interrupted, whereby on the one hand the angle lever 36 is brought back to its initial position by the return spring, while on the other hand the contacts 28 and 29 close again and a new weld is initiated. These processes continue until the switch 7 is opened by releasing the foot lever, whereby the primary circuit is interrupted.

Instead of using two electrode rolls, a number can of course also be used Rolls together with a linearly moving, for example a spike-shaped electrode Find use. In addition, the actuation of the solenoid of the advancing mechanism supplying contacts are done in some other way.

In all cases, the advantage is achieved that through an extremely simple arrangement the advance of the welding piece can be actuated and that one of the respective Simple control of the feed mechanism, largely adapted to the conditions, by means of the auxiliary contacts, which can be arranged in any way becomes possible.

Claims (3)

Patent Claims: ι. Electric seam welding machine, in which the movement of the weldments takes place gradually compared to the welding electrodes, characterized in that the step-by-step feed directly by a positively controlled electromagnet is effected. 2. Electric seam welding machine according to claim 1, characterized in that that the activation of the electromagnet takes place through an auxiliary contact, which is from the mechanism actuating the linkage of the machine is switched on. 3. Electric seam welding machine according to claim 1, characterized in that that the activation of the solenoid causing the advance has taken place Welding by an automatic switch that interrupts the primary current and is influenced by the welding current he follows. 1 sheet of drawings.