DE762864C - Switching arrangement for generating short-term current pulses by means of a grid-controlled vapor or gas discharge path, preferably for electrical spot welding - Google Patents

Description

Switching arrangement for generating short-term current pulses by means of a grid-controlled vapor or gas discharge path, preferably for electrical Spot welding The invention relates to a switching arrangement for generating short-term current impulses, which a grid-controlled steam or gas discharge path, contains, in the anode circuit of which the work coil one the duration of the current pulses controlling relay is, preferably for electrical spot welding.

There are already devices known in which the duration of the current pulses on the duration of the charging or discharging of one in the control circuit of a discharge site lying capacitor makes dependent and in which the current pulses by operating a switch that turns on or shorts the capacitor. The invention relates to a particularly advantageous embodiment of such a switching arrangement - n.

According to the invention that is in the grid circle the discharge path lying capacitor connected to a DC voltage source via a series resistor and is operated by two switches located in the Reilie: erIyrücl; t. The first: this one The switch is in the idle state. It is called a-1: ittin "d: 3 work process by the zugelld: rige. with a stator switch and a Kc, nd: n # ator in Reilie Briefly close the actuating coil connected to a direct voltage squelI-e tind thereby causes the capacitor to discharge as well as (las ignited (I: r discharge path, °. The second switch is closed in the idle state and is (itlrcll the current d, - i- in the Aliodenkreis the discharge line 1i iiden Arleitsspule @ eüfinet; liier (itircli is (1 # r short-circuit of the capacitor canceled> eti and thus des: n t; "iedel`laden via the @ 'orwiderstatid as well as (later locking round: r discharge path.

A: @usführuilgsl) eiaüa (fier invention is shown in the Z-iclintiii ". A Wechselstroill (Itl-lte Ist Inlt I heL ': Ithllet. She ist IIlit dem erliI "atleheI", den @cliwelfielelitrodell - ?, üli.r a Tratisforniatnr, 3 verliundeti. In the Priniä The control contact is located in the circuit of this transformer. with the switching coil 3. The switching coil is expediently made of the same t% -eclis ° _Istromnetz for the steam or gas 6 i fed. The duration cl -, - r Stromdurchlaß (] er Entla (luii-Sstreclce 6 be, stimnit the length of the Imptilsz. di-e (lein transformer 3 fed. «-erelen. Zwechmäljig is the coil - 2 @ a Kond1-Isatcr; connected in series with a resistor in parallel. tim the through the discharge bag "sstreclce (1 l @ icli @ rerirhtet @ n t% -. ocllselstrom zu `lättal.

A St ° ti # - rg, ittccrkreis der Eiitladtuigsstr_clze is the control capacitor G. which is from the secondary winding io of a transformer i i -esl) 2ist. This- # r Transformer is expediently e1) connected to the 2 # network I -, -. In seiiieiii Secondary circuit is the GIeicIiricliter 12, and for smoothing the DC voltage is z «-right a condensate saturation 13 @` orge @ elien. Ein'ü second secondary winding 1.l Ies transformer II is used to feed the hot cathode of the discharge. str @ cl: a @i. The hatliode is finitely connected to your equal contact of a potentiometer. that from the resistors 1, 3 and 16 1) zstelit and to the smoothing capacitor 13 i @ tlgaclilossen is. In series with your control capacitor 9 there is a goal stall 16 '. The duration of the Strotnführungun the discharge route 6 is more aterous due to the setting de Potentioineters durLli determines the time constant of the error cI and Iti. Of the ne-ative P (, 1 of the St ° ueF`ILonrIensater is connected to the Grid connected to the discharge line. Between the grid and the cathode there is a stretch another capacitor 18.

In the idle state, the discharge path C) is blocked. since the capacitor 9 is charged to the full voltage between the lines.4 and h. If the electrodes 2 ': leads' - earth together, the switch 1g is closed in the case of an e '' -issen I; lel; trodendrttclc, which is connected to a Kondeisatoi` 2o ulid #ciner relay coil 21 z @ checkäßi to (-liese-lire track voltage source "-ic the capacitor c) is connected. A short surge of current flows through the relay 21 and causes the contact 22 to close Cathode positive lead 1> connected. The discharge path 6 and the coil 3 are energized. and switch 4. is closed. At the same time, the contact 23 is also through the coil; ciffnet3 d.Ii. dir Ktirzschhtl: - the capacitor 9 is caught up, and the "-ieder-Iadtiii- des Stetrerl@o.ildeusatnrs over the ark" -iderstaüd 16` he-iniit. The control line falls, and the discharge path 6 is finally -, - blocked and the current pulse is ended, since the knutakt .l. Üf in @ t.

By nordnun _ @ "of the relay 21, 22 111% ': i`lrindun" with your capacitor 2o is --rreiclit that only a Steuerillptils is fully independent of the duration of closing of the switch i <erzeii ;; t. Likewise, the duration of the current impulse is fully dependent on the duration of the closing of the switch: 1G. The arrangement of the short-circuit switch 23 ensures that the charging of the control capacitor g.: R-st begins when the switch is also closed, since both switches are activated by the same coil.

Claims (2)

PATENTA \ SPPt`CIJI :: i. Switching arrangement for producing short-term current impulses with a lattice-controlled vapor or gas discharge path, the anode circuit of which contains the coil of a relay that controls the duration of the current impulses and in whose lattice circuit a capacitor l1e; Zt. preferably z112- electric ULTI-flex welding. characterized -ekeiliizeichnet that lying in the grid circuit capacitor (9) -iderstand over a pre "is connected (1 (I`) to a DC voltage source (13) and is bridged by two lying in rubbing switch (22, 23), that the first switch (22) is open in the idle state, when the operation is initiated by the associated actuating coil (2i) located in series with a control switch (i9) and a condenser altar (20) connected to a DC voltage source (13) is briefly closed and thereby causes the discharge of the capacitor (9) and the ignition of the discharge path (6), and that the second switch (23) is closed in the idle state, by the current of the work in the anode circuit of the discharge path (6), tsspu.le (5) is opened, thereby canceling the short circuit of the capacitor (9) and thus causing its reloading via the series resistor (i6 ') and the later blocking of the discharge path (6). 2. Switching arrangement according to claim i, characterized in that the bias voltage for the grid d.er Elltladungsstrecke can be changed by a potentiometer (15) and is taken from the same voltage source (13) which is also used to charge the Zeitkreiskonidensators. In order to distinguish the subject matter of the invention from the state of the art, the following publications have been taken into account in the 1, -distribution procedure: French patent specification no. 787 168; bribisrhe patent specification no: 435 193.