SU960322A1 - Device for supplying acieration baths with current - Google Patents

Description

(54) DEVICE FOR POWER SUPPLY OF COOKING BATH

The invention relates to electroplating, in particular, it can be used to power a bath of residual current.

The closest to the technical essence of the invention is a device for supplying current to the bednalisation, containing a voltage regulator, a step-down transformer, the secondary winding of which is connected to the anode of the bath, the diode and the thyristor installed oppositely in parallel to the connection circuit one of the ends of the secondary winding of the transformer with the cathode of the bath, the control time delay control pulses included in the circuit of the control electrode of the thyristor, and the mode switch baths. The thyristor anode is connected via an octal switch with the diode installed in the cathodic component of the rest current, and the thyristor cathode is connected to the other end of the transformer down-circuit.

The device provides a smooth adjustment of the anode component of the current during the acceleration cycle on

asymmetric current n transition due to a switch to the bath operation mode on the pulsating full-wave current 1.

However, the presence in this device of a mode switch installed directly in the power supply circuit of the bath, where a large amount of current flows,

10 reduces the reliability of the device itself, since the atmosphere in the conditions of the galvanic section has an increased corrosivity. This increases the resistance of the contact group, worsening the very conditions of its operation, and leads to rapid burning of the contacts.

The aim of the invention is to increase the reliability of the device in operation by measuring the high-current power circuit of the bath in a non-contact manner.

This goal is achieved by the fact that a device for feeding a 25 ½ liter of baths of the rest, containing a voltage regulator, a lowering transformer, the secondary winding of which is made from the vent from the midpoint, which is connected to the anode of the bath, the diode and the thyristor, are set opposite to parallel ; a circuit in the connection of one of the ends of the secondary winding of the transformer with the cathode of the bath, a control delay controller time pulse included in the circuit of the control electrode of the thyristor, and a switch of the operating modes of the bath, of an additional thyristor, vklyuchenna 1 IU ode vtorm end of the transformer secondary winding and the cathode of the bath, wherein Anole auxiliary thyristor is connected to the winding end of the cathode and the control electrode - the cathode wa dN and the switch operation modes installed in the chains control electrodes of both thyristors.

The drawing shows the electrical circuit of the device for supplying a bath with a current of rest.

The device consists of a voltage regulator 1, a step-down transformer 2 connected to it, the secondary winding 3 of which is made with a diversion from the midpoint connected to the anode 4 of the rest bath. In the connection circuit of one and the ends of the secondary winding 3 of the transformer with the cathode 5 of the bath, the diode B and the thyristor 7 are installed counter parallel, the control electrode of which is connected via the switch 8 of the iT operating modes to the regulator 9 of the control of the pulses of the pulses, made according to a well-known scheme, for example Amplitude Phase The other end of the secondary winding 3 is connected to the cathode 5 of the bath using a thyristor 10, the control electrode of which is also connected to the catho. Bath house through the switch 8 modes of operation. In addition, an 8 meters ammeters 11 and 12 are installed to control the anodic and cathodic components of the current in the bath, respectively.

The device works in the same way.

With a negative half-voltage, the thyristor 7 does not conduct the current on the left, according to the scheme, the end of the secondary winding 3 of the step-down transformer 2, and the diode b conducts the current component to the cathode 5 in the bath, the amount of current is controlled by the ammeter 12. When changing the polarity of the voltage on the secondary winding B. does not conduct, and the thyristor 7 conducts the current of the anode component to the cathode 5 from the moment the control pulses arrive, from the regulator 9. The current of the anodic current is continuously regulated by changing the delay time of the control pulses th component, which is monitored by the ammeter 11 and set in accordance with the process and ostaliva.

The thyristor 10 in this mode of operation will be permanently locked, since the circuit of its control electrode is open by the switch 8.

After the end of the acceleration cycle, the control current of thyristor 7 is disconnected at astmetry current by means of switch 8, and the control electrode of thyristor 10 closes. In this case, the thyristor 7 becomes permanently locked, and diode b and thyristor 10 work as an opposite parallel rectifier, whereby to the cathode

5, a negative potential d of a wave-periodical pulsating current is supplied, the value of which is controlled by an ammeter 12.

I

Thus, in the proposed

the device, unlike the well-known contact method, low-current thyristor control electrode circuits are switched, and the switching of the high-current power supply circuit of the bath

Ostaling occurs in a contactless way, which ensures more reliable operation of the proposed device in an electroplating shop, the atmosphere of which has increased corrosivity,

negatively influencing contact groups (increasing the resistance of contact groups and contributing to the rapid preparation of contacts).

    /. ,

Expected annual economic effect will be 45 rubles.

Claims (1)

Invention Formula A device for supplying a bath with a current, containing a voltage regulator lowering transducer, the secondary winding of which is made with the removal from the midpoint, connecting the sensor with the anode of the bath, a diode and a thyristor, installed oppositely in parallel in the connection circuit of one from the ends of the secondary winding of the transformer with the cathode of the bath, the controller of the delay time of the control pulses impacted into the circuit of the control electrode of the thyristor, and the switch of the operating modes of the bath differing in that. In order to increase the reliability of the device by switching a high-current power supply circuit of the bath to a non-contact method, it is equipped with an additional thyristor connected between the second end of the secondary winding of the transformer and the cathode of the bath, the anode of the additional thyristor connected to the end of the winding, the cathode and control electrode with cathode baths, and the switch of the bath operation modes is installed in the control circuits of the common electrodes of both TORIS tiris. Sources of information taken into account in the examination 1. USSR author's certificate 615154, cl. C 25 D 21/12, 1976.