SU1135821A1 - Arrangement for power supply of electroplating baths - Google Patents

Abstract

A DEVICE FOR POWER SUPPLY OF GALVANIC BATHTUBS, containing a power transformer with a variable transformation ratio, a converter made in the form of a power transformer with up to three meters, and a source of direct current, so that the purpose of improving the physicomechanical properties of precipitation and increasing the performance of the electroplating process by controlling the parameters of polarizing current pulses and direct current, the converter is made in the form of two controllers, one of which is controlled, and others uncontrollable, connected to the galvanic bath counter, the input of the controlled rectifier through the power transformer is connected to a three-phase AC network, and the input of the uncontrolled rectifier is connected to the power converter with a variable transformation factor, and the transformer is connected to the three-phase AC network. current through the thyristor starter and master timers.

Description

The invention relates to electroplating and can be used to supply electroplating baths during non-stationary and stationary electrolysis to obtain precipitation with improved physical and mechanical properties. A device for feeding electroplating baths containing a three-phase power transformer, is known. connected to the network through a contactless three-phase voltage regulator. The reduced voltage from the two secondary windings is fed to the thyristors and the resultant one obtained from them. The half-wave current of two phases, flowing in the cathode direction, feeds the galvanic bath. Only during this time, during the period, electrodeposition occurs. A reverse current pulse is created by the third secondary winding connected to the bath via an autotransformer, the limiting resistor and the thyristors l. However, this device allows one to obtain a limited number of current forms: the rectified half-wave current of two phases in the cathode direction is a reverse pulse, determined by a sinusoidal voltage of the third phase in the opposite direction. With increasing device power, its weak link is an autotransformer and a limiting resistor. The device does not allow to adjust the frequency and duty cycle of current pulses. The pause between current pulses is uncontrollable and is unambiguously determined from the period duration and the pulse duration. In addition, the use of this installation dramatically reduces the productivity of the process, since in the intervals between current pulses the electrolysis process is interrupted. The device does not allow to receive direct current in case of need. The closest to the invention according to the technical essence and the achieved result is a device for powering electroplating baths containing a power transformer with a variable transformation ratio, a converter made in the form of a power transformer with rectifier and a source of direct current. The device has two sources of current, which operate on an obpdgy load ku galvanic bath. One source of direct current, and the second provides the imposition on the direct current of the half period of a sinusoid of the forward direction I. However, the known device does not allow to obtain polarizing pulses with adjustable parameters of frequency, duty cycle and amplitude. In addition, it has a power limit. The purpose of the invention is to improve the physicomechanical properties of sediments and increase the productivity of the electroplating process by controlling the parameters of polarizing current and direct current pulses. The goal is achieved by the fact that in a device for powering electroplating baths containing a power transformer with a variable transformation ratio, the converter is made in the form of a power transformer with a rectifier and a DC source, the converter is made in the form of two rectifiers, one of which is controlled and the other unmanaged, connected to the galvanic bath is counter, and the input of the controlled sensor through the power transformer is connected to a three-phase AC network, and the input eupravl emogo rectifier is connected to a power transformer with a variable transformation ratio, and a transformer connected to a three-phase AC current through thyristor contactor and dial slots. FIG. 1 shows a block diagram of the device; in fig. 2 shows the forms of currents and voltages obtained with the device. The device consists of a power transformer 1, a controlled rectifier 2, a control unit 3 that controls the driver 2, a thyristor actuator 4, a power transformer 5 with a variable transformation ratio, an uncontrolled timer 6, a time interval adjuster 7 that controls the thyristor starter 4, power supply unit 8, device control unit 9. The device is connected to the electroplating bath 10. The device operates as follows.

From the external industrial three-phase AC network (Fig. 2a, the voltage goes to the power transformer 1 and through the thyristor starter 4 to the power transformer 5 with a variable transformation ratio (Fig. 26). From the power transformers 1 and 5, the voltage goes respectively to the drives 2 and 6. The thyristor starter 4 is controlled by a time interval setting unit 7, in which a series of rectangular IM pulses with adjustable duration and pause is formed. The change in the transformation ratio of the power t The inverter 5 controls the amplitude of the current pulses. The rectifier 2, controlled by the control unit 3, controls the average current flow through the galvanic bath 10. The control unit 3 and the time setting unit 7 are powered from the power supply unit 8 connected to external ac network.

The operation of the device is controlled by the control panel 9. Thus, pulsed and direct current are simultaneously applied to the galvanic bath 10 of rectifiers 2 and 6. As a result of the deposition of these currents, a combined current with adjustable parameters flows through the galvanic bath 10: duration, pause, amplitude (Fig. 2 d, e, g). In addition, the device can operate in the pulsed current mode (Fig. 2c) or in the DC mode (Fig. 2g), which ensures its versatility.

Thus, by adjusting the parameters of the combined current for various types of coatings, the possibility of selecting the optimum ratios of interconnected electrical parameters of the deposition process expands, which in turn leads to an improvement in the physical and mechanical properties of the precipitates and a decrease in the electrolysis process performance.

The annual economic effect from the use of the proposed device is approximately 12,200 rubles.

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Claims (1)

DEVICE FOR POWER SUPPLY OF A GALVANIC BATH, containing a power transformer with a variable transformation ratio, a converter made in the form of a power transformer with a rectifier, and a direct current source, characterized in that, in order to improve the physicomechanical properties of the siege, increase the efficiency of the electrodeposition process by controlling parameters of polarizing current and direct current pulses, the converter is made in the form of two rectifiers, one of which is controlled and the other uncontrollable, I connect the input to the galvanic bath is opposite, and the input of the controlled rectifier through a power transformer is connected to a three-phase AC network, and the input of an uncontrolled rectifier is connected to a power transformer with a variable transformation coefficient, and the transformer is connected to a three-phase AC network through a thyristor start, a body and a time interval adjuster . fishing SUnn 1135821 f 1135821