SU1690980A1 - Device for electrochemical processing of metals - Google Patents

Abstract

The invention relates to mechanical engineering technology, namely to the means of electrochemical metal processing. The aim of the invention is to expand the technological capabilities of the device. Through the electrochemical load 7, a current flows in the forward and reverse directions. The magnitude of the flowing current is detected by the sensor 8 and controlled by the power control means 10 by controlling the conversion frequency in the inverter 2 installed in front of the supply transformer 3. The process is controlled by a square-wave generator with adjustable frequency and duty cycle. During the positive half-wave, the signal of this generator flows through the direct current load, while during the negative one, the reverse current flows. The magnitude and law of variation of both forward and reverse currents during the corresponding half-waves of the generator signal is determined by functional converters 13 and 14, which supply the corresponding signals to the reference input of the power control means 10. A rectifier 9 is installed between the current sensor and the power control means, and between the functional converters and the control means are controllable switches 11 and 12, which makes it possible to use the same means to control both forward and reverse currents. 1 il. sl s o y o che 00 o

Description

The invention relates to mechanical engineering technology, namely to the means of electrochemical metal processing.

The purpose of the invention is to expand the technological capabilities of the device.

The drawing shows a device for the electrochemical treatment of metals.

The device contains a network rectifier 1, a controlled inverter 2 with an input

frequency conversion control, frequency-dependent transformer 3, low-voltage rectifier 4, which includes two thyristor cells 5 and 6, respectively, to control the forward and reverse currents, load 7, connected in series with the load current sensor 8, rectifier 9, power control means 10, two keys 11 and 12, two functional converters 13 and 14, control generator 15 of rectangular pulses with means of frequency control 16 and duty cycle 17. Direct and inverse outputs of said generator 15 s unified respectively with one of the thyristor GOVERNMENTAL cells and one of the functional converters, function generators, each through a corresponding key 11 or 12 are connected to the power control means 10, and both key outputs combined. The output of the power control means is connected to the frequency control input of the inverter 2.

The device works as follows.

The energy for electrochemical processing comes from the AC mains, which is converted into a constant rectifier 1. Inverter 2 converts the supply voltage into alternating, and the frequency of this alternating voltage is determined by the signal fed to the control input of the inverter. The alternating voltage is fed to the input of the transformer 3, where it is converted to a low voltage suitable for supplying the electrochemical load 7. The characteristic of the transformer is chosen such that with increasing frequency the voltage on the output windings will increase. The low-voltage rectifier 4 installed before the load due to the thyristor cells 5 and 6 allows controlling the forward and reverse currents flowing through the load 7. Due to the fact that the control inputs of these cells are connected to the direct and inverse outputs of the generator 15, rectangular pulses, a direct current flows through the load during the positive half-wave of the signal of this generator and the reverse during the negative half-wave. Sensor 8 indicates the magnitude of the flowing current. The sensor signal through the rectifier 9 is fed to the information input of the power control means 10. The second, reference input of this tool receives signals from one of the functional converters 13 or 14. The keys 11 and 12 transmit to this input the signals of the corresponding functional converter, which allows

one means 10 controls independently both forward and reverse currents. With the help of functional converters, the required mode can be maintained.

for both direct and reverse currents. The drawing shows variants of the chains of the functional converter; proportional to 18, differentiating 19 and integrating 20, providing

the time of the current half-wave is respectively constant, decreasing or increasing voltage on the load. The functional capabilities of the device are expanded by providing the possibility of independent control of forward and reverse currents, and for this purpose only one power control is used.

Claims (1)

Invention Formula A device for electrochemical processing of metals, containing a mains rectifier, an inverter with a frequency control input, a frequency-dependent step-down transformer, a low-voltage rectifier with direct and reverse current control inputs, a means for controlling output power with information and mode inputs, a current sensor connected in chain loads of a controlled low-voltage rectifier, as well as a control generator of rectangular pulses with means for controlling the frequency and duty cycle, the direct and inverse outputs of which are connected to the control inputs of the forward and reverse currents of the low-voltage rectifier, characterized in that the purpose of expanding technological capabilities, it is equipped with an additional rectifier installed between the output of the current sensor and the information input of the output power control means, two functional conversions mi bodies and two keys, and inputs functional converters and control inputs of the keys are connected respectively to the direct and inverse outputs of the control generator, information inputs of the keys are connected to the outputs functional converters, and the outputs of the keys are combined and connected to the mode input of the control means. Network