SU960323A2 - Device for continuously controlling thickness of electroplating coating - Google Patents

Description

dsm of the source of reference voltages, the output of which is connected to the first input of a comparator, the second input of which is connected to the output of the transducer, and the output to the input of the executive organ.

The drawing shows a block diagram of the device.

The device contains a sensing element 1 with a witness electrode 2, a sensing element 3 from standards 4, a vibrator .5, a master oscillator b, a measuring circuit which consists of amplifier 7, converter 8, comparison unit 9, indicator 10, actuator 11, comparator 12, the source of the reference voltages 13, the software control unit 14.

The sensing elements 1 and 3 are interconnected according to the scheme of compensatory differential activation and each of them is made in the form of two katuyeks arranged one with another.

The witness electrode 2 is rigidly fixed in the sensitive element 1 and the standard 4 isolated from the action of aggressive media with a coating thickness corresponding to the applied thickness of the finished part is rigidly fixed in the sensitive element 3.

Sensor 1 and sensor 3 are rigidly connected. with a vibrator 5, which serves to destroy the gas bubbles on electrde-witness 2,:

Input; sensitive elements 1 and 3 are connected to the output of the master oscillator 6. The master oscillator €. serves for generating a fixed frequency signal.

The output of the sensing elements 1 and 3 is connected to the input of the amplifier 7, which serves to amplify the input signal.

Output . an amplifier 7 is connected to an input of a converter B, which serves to rectify a signal.

The output of the converter 8 is connected to the input of the comparison unit 9, which serves to register a given signal level.

The output of the converter S is connected to the input of the indicator 10, which serves to tune the device and visually observe it by increasing the layer thickness.

 The output of the comparator unit 9 is connected to the first input of the executive unit 11, which serves to generate a signal / disconnecting current of the bath and signaling the end of the process.

The output of the Converter 8 is connected to the second input of the comparator ii.

the first input of which is connected to the output of the source of the reference voltages 13. Krmparatrr 12 serves to compare the input signals in amplitude. The source of the reference voltages 13 serves to form the reference voltages with predetermined amplitudes, which are cooTBeTCTBSTOT minimum, the allowable current output values at the time of the formation of the reference voltage.

The control input of the source of the reference voltage 13 is connected to the output

software control 14, which is necessary to control the operation of the source of reference voltages 13 in the programmed spaces; of time.

The output of ksacharatora 12 is connected to the second input of the executive body 11, which serves to signal the deviation of the current output from the allowable limit and to form a signal, and to enter a correction in the control unit of the metal consumption of the coating. Electrode witness 2 is connected to the electrode of the bath 15; . ..; ..; .

The device works as follows:

The sensing element 1, containing the witness electrode 2, connected to the electrodes of Vaina 15, and the sensing element 3 containing the isolated Ethigon 4, are immersed in a bath: with electrolyte at the same level together with the parts of the lot being processed which are connected to the indicated electrode. Simultaneously with turning on the vania current, the master oscillator b and the measuring circuit are turned on. The master oscillator 6 generates a fixed-frequency signal: a new frequency, which is applied to the sensitive elements 1 and 3 and forms a magnetic field in them. Under the action of the floor of the sensitive elements 1 and 3, which are vibrated by the vibrator 5, eddy currents arise in the electrical witness 2 and standard 4, the magnitude of which depends on the thickness of the coating.

The magnetic field / formed by the vortex # {and currents, is directed opposite to the magnetic field of the sensitive elements, which introduces additional active and inductance resistance into the circuit of sensitive elements. Active and inductive resistances of the sensitive element 3 containing the standard 4 are constant, and the resistance of the sensitive element 1 containing electrode-witness 2, vary by m; electroplating layer of electroplating on the electrode-witness. This causes changes in the error signal removed from the sensing elements 1 and 3, which is amplified by the amplifier 7, converted by the converter 8 and fed to the comparison unit 9 and to the second input of the comparator 12. A signal from the output of the reference voltage source 13 is supplied to the first input of the comparator 12 which is enabled by software control block 14.

The pulse duration of the reference voltage must be sufficient to compare the amplitudes of the input voltages of the comparator 12.

the magnitude of the reference voltage amplitude is selected when covering the circuit of 4 of the condition of the correspondence to the minimum (to the tolerance on the current output current.

When the current output changes to electrolyte to a value less than permissible at the first input of the comparator 12, the amplitude of the signal will become less than the amplitude of the signal that is fed to the second input of the comparator 12, which causes the formation of a signal at the output of the comparator 12 and the signal from the comparator output to the second input, executive; authority 11, which signals the output deviation tbk from the permissible limit and generates a signal to enter a correction into the device for monitoring the consumption of the metal of the coating.

Upon reaching the thickness of the layer of the rated value, the signal p; the matching causes the actuation of the actuator, which signals the end of the electroplating process and the signal to turn off the bath current.

The indicator 10 registers the change of the error mismatch.

The use of this device ensures timely correction of the accounting for the actual metal consumption, signals the need for measures to restore the electrolyte concentration, which prevents the subsequent electrolysis process from exceeding the time and eliminates the need for additional control operations to determine the current efficiency during the deposition of the coating. gt

The expected economic effect from the introduction of the device on one

5 galvanic bath will be 1.3 thousand rubles.

invention formula

Device for continuous control of the thickness of the electroplated coating on the author. 789639, characterized in that, in order to expand the technological capabilities of the device by monitoring the current output during the deposition process, it is equipped with a program block with a lot of control, a source of reference voltages and a comparator, and the output of the software control block. It is connected to the input of the source of the reference voltages, the output of which is connected to the first input of the comparator, the second input of which is connected to the output of the converter, and the output to the second input of the executive body.

Information sources, ; BQ dirtied with 3KCtieptH3e 40 1, USSR Copyright Certificate 789639, cl. 3 C 25 D 21/12, 1979.

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Claims (1)

Claim A device for continuous monitoring of the thickness of the plating according to Auth. "789639, characterized in that, with the aim of 25 expanding the technological capabilities of the device by monitoring during the deposition of the current output the output of which is connected to the first input of the comparator, the second input of which is connected to the output of the converter, and the output to the second input of the executive body.