DE367096C - Automatic triggering device in electrical welding and heating machines - Google Patents

Description

867096

By the German imperial patent 163354 an electromagnetic release has become known, which is caused by the during change occurring during welding in the S current intensity is regulated. This tripping refers to the coupling in machines driven by a shaft. Immediately after the clutch has been released, the first function of the now rotating

to open the shaft of the power switch. It is clear that the triggering even without first To set a wave in motion can be used to directly activate the Stromaius switch to open, and thus the application of such an electromagnetic Triggering is easily given even with welding machines without a drive.

In addition to the one mentioned above, there have also been other similar triggers under different names, such as S troller, welding machines o. Dj, but which ohrj
agility often
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of the person working on the machine "can be carried out, which is usually not the case. Wrong welds will also be recorded until the regulation finally went is.

In order to remedy this and to create a trigger that once set no readjustment requires more, regardless of how the switch position of the transformer is changed, is an arrangement according to the invention taken, after which the action of an interconnected with the transformer of the machine Solenoid, the iron core of which carries the contacts for opening and closing the current at its end, is influenced in such a way by the variable regulating stages that the same at each stage Attraction of the solenoid results.

Fig. Ι of the drawing shows the arrangement schematically. If you follow the circuit in the solenoid windings wound in parallel to the transformer, i.e. with voltage Switch position 1 corresponds to the full number of turns of the transformer, i.e. lowest Secondary voltage and thus the lowest current consumption, it can be seen that the • also flows through the full number of turns of the olenoid in the same sense, "This condition is fundamental. The maximum tensile force that occurs is the degree to which the iron core is in its position to the ■ noi'd must be set once for such attraction to take effect So that it can snap out of the resilient contact men and into the solenoid and thereby the stream is opened - / becomes. As the welding progresses If the current increases, the current is opened when the maximum is reached, the weld is finished. Becomes a stronger welding cross-section and thus a higher switch position taken, the current intensity in the primary circuit increases compared to the position ι and is at position 4 accordingly

the highest secondary voltage and highest Primary current strongest. Assuming that switch position 2 is in use, see this the stronger primary current does not run the same in all turns of the solenoid Direction - but only in those of the first solenoid subdivision. · In the turns . of the first subdivision, the beginning and end of which with the switch positions 1 and 2 is connected, a current generated in the switched-off transformer windings circulates in opposite sense.

The subdivision of the solenoid is so dimensioned that the Amperewindungszabl increased by the higher primary current in the Main turns of the solenoid idiuroh den the effect of the opposite current in the subdivisions is neutralized so far or is balanced, 'that again the same force of attraction results as with the ! basic state on switch position 1. With each following switch position increases the primary current always higher, but the additional subdivisions of the solenoid

25 'also exert a correspondingly increased counteraction, so that the force of attraction remains the same for every switch position. This makes any further regulation unnecessary ·, d ^! The initial setting therefore also applies to all cross-sections.

The above description related to a trip ¹ at the maximum current of the transformer. Is it necessary to set the current to a minimum, as is the case with heating machines, the current consumption of which decreases as the heating progresses, or when welding strong chain links, narrow rings and the like, where the initially considerable loss over the closed side and thus the current decrease also decreases with increasing heating An arrangement is chosen according to the diagram in Fig. 5. The minimum release is achieved by pulling the iron core off with a spring The first setting to switch position 1 of the transformer is also used as a minimum trigger and then remains the same for all other positions.

Fig. 6 shows an embodiment in use on a rivet heating machine. In order to bring about a simple, quick and extremely accurate first adjustment, the arrangement is made so that with appropriate mechanical aids, for example by placing the solenoid coil on one Slide or a sliding surface, the removal of the iron core and coil and thus the effect the latter can be changed to the former '.

Figs. 2, 3 and 4 show a design shape tripping in use on spot welding machines, where tripping for maximum current comes into question.

Fig. 2 is retirement. The iron core is withdrawn from the last release, the power interrupted. Fig. 3 is the position during welding. The foot lever, with which the Sohweißarm are moved, has by one on the rear push rod attached, strong spring o. The like. Mechanical device the iron core between the Contacts of the switch pushed, the current is closed. With increasing amperage As shown in the diagram in Fig. 1, the iron core can be seen in the given atigeni view the contacts are pulled out, the welding is finished (Fig. 4). With letting go of the foot lever also moves the push rod downwards and the resilient one The cam or the like snaps under the cams, pins, provided for lifting the same or the like

With Stimipf'Scfeweißimaschincn that can Insertion of the iron core between the contacts by moving the contact slide, the handwheel or the hand lever.

The release itself can be operated by kick or by hand instead of the previous one Ordinary circuit breakers can be used, as the latter are completely unnecessary. The production this release [is unlikely to be higher than that of the ordinary Off switches, therefore, also represent progress in economic terms.

Claims (1)

Patent claim: Automatic release device in electrical welding and heating machines, characterized in that the attraction of solenoid windings on the iron core connected to the circuit breaker, if there is a change the regulating rods on the welding or heating transformer through the currents of opposite directions excited in the disconnected windings is regulated to a certain, always constant level. 1 sheet of drawings.