JPS6236862Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an additive replenishment management device for electroplating that can automatically replenish additives in electroplating.

(Prior art) In electroplating, various additives are usually added to the plating solution in order to improve the gloss, throw, etc. of the plating, but these additives affect the progress of the plating process. It is consumed in proportion to the increase in the amount of current flowing.

Therefore, if there are multiple plating tanks of the same type,
Conventionally, the plating current for each plating tank was detected by a current detector such as a current shunt, and the output was added to a DC current integrating counter, and the output produced every fixed number of counts was used to operate a metering transfer device to transfer a fixed amount. In order to manage the plating solution by replenishing the plating tank with additives, each plating tank is equipped with a DC current integrating counter, quantitative transfer device, etc., which is activated by the output of a current detector such as a shunt. Since an additive replenishment device is installed to manage the replenishment of additives in each plating tank, it is difficult to use the same type of plating solution in multiple plating tanks, and there is a risk of variations in the plating finish. It was hot.

(Purpose of the invention) The present invention was made to eliminate the drawbacks of the conventional method.The present invention is an additive replenishment management for electroplating that eliminates variations in plating finish by making the plating liquid in multiple plating tanks the same composition. The goal is to provide equipment.

(Structure of the invention) The present invention consists of a plating liquid circulation system consisting of a plurality of plating tanks, a single adjustment tank, and a single circulation pump, and a power supply line with positive and negative polarity that supplies power to each plating tank. A DC current transformer that passes through one side to the DC side, a current transformer whose input is the AC side output of the DC current transformer, and a total current of the current flowing through each of the power supply lines due to the output of the current transformer. A current detector that detects, a DC current integration counter that integrates the output of the current detector and outputs an output every fixed number of counts, and a DC current integration counter that is operated by the output of the DC current integration counter and sends it from the additive container to the adjustment tank. This device is characterized by being comprised of a quantitative transfer device that transfers a fixed amount of additive, and will be explained in detail below with reference to the drawings.

In FIG. 1, reference numerals 1...1 indicate a plurality of plating tanks 2...2 containing plating solutions 2...2 of the same type of plating.

The plating liquid 2 in the plating tank 1 is divided into a plurality of plating tanks 1...1 by supplying the plating liquid 5 from a single adjustment tank 4 in a divided manner to a plurality of plating tanks 1...1 by a constant circulation pump 3.
are mixed into the same composition by flowing down from the overflow ports 6...6 into the adjustment tank 4.

Furthermore, each plating tank 1 has a DC power supply device 7...7, and the DC output of the plurality of DC power supply devices 7 is applied to the anode plate 8 and the cover immersed in the plating solution 2 of the plating tank 1, respectively. In order to supply power to the plated object 9, one of the positive and negative power supply lines 10...10, 10'...10' is passed through the DC side of the DC transformer 11.

In this state, when a DC current is passed through each plating tank 1...1, the AC side current of the DC current transformer 11 is as follows.
As shown in the principle diagram of a DC current transformer shown in Figure 2, bus 1
2 is passed through the DC side of the DC current transformer 11, and the DC side current flowing to the bus bar 12 is Io, and the number of turns of the AC winding is N. The AC side current I is determined by the law of equal ampere turns. Since I=Io/N, the current value is the current flowing through the power supply line 10 divided by the turns ratio.

The AC side current of the DC current transformer 11 for each of the power supply lines 10 determined in this way is applied to the input side of the current transformer 13, respectively.

14 is a single-phase AC power source that energizes the AC winding of the DC current transformer 11.

The output current of the current transformer 13 is a current value divided by the turns ratio, similar to the principle of the DC current transformer described above.

Here, if there are multiple input power sources of the current transformer such as I ₁ , I ₂ ...I _o , the total current Io is Io = I ₁ + I ₂ ... + I _o , so the current flowing through each feeder line 10 The current value is obtained by dividing the total current by the turns ratio of the DC current transformer 11 and the current transformer 13.

Reference numeral 15 designates a single-phase bridge rectifier provided in series with the output terminal of the current transformer 13, and 16 a current detector for detecting the total current of a shunt connected between the DC terminals of the current transformer 15.

In addition, in the principle diagram of a DC current transformer in Figure 2, bus 1
The DC current of No. 2 is directly determined by a DC ammeter 17.

Reference numeral 18 denotes a DC current integration counter that receives the output of the current detector 16 as input, integrates it, and outputs a pulse at every predetermined integration, and counts the output pulses of the integrator and outputs an output every predetermined number of counts.

Reference numeral 19 denotes a quantitative transfer device for transferring the additive 21 from the container 20 to the adjustment tank 4;
Reference numeral 9 is composed of, for example, a diaphragm-type metering pump and a timer, and each time an electric signal from the DC current integrating counter 18 is applied, the metering pump is operated for a fixed period of time to transfer a fixed amount of additive. .

(Effects of the invention) As is clear from the above explanation, the invention has the following effects:
The plating liquid in multiple plating tanks is supplied by a continuous circulation pump that divides the plating liquid from the adjustment tank to the multiple plating tanks, and allows it to flow down from the overflow port of the plating tank to the adjustment tank. Because they are mixed and have the same composition,
Even if the plating processing amount differs from plating tank to plating tank and the consumption of various additives added to improve gloss, throw, etc. differs, the plating solution in a plurality of plating tanks can have the same composition.

In addition, the current supplied to the anode plate and the objects to be plated immersed in the plating solution in the plating tank from the DC power supply device provided in each plating tank is passed through a DC current transformer to a current transformer. The output of the current detector is added as an input to the DC current integration counter, and an electric signal is generated every fixed number of counts.The additive is replenished and mixed into the adjustment tank from the quantitative transfer device in fixed amounts, so the plating tank Since there is no need to provide an additive replenishing device consisting of a DC current integration counter, fixed amount transfer device, etc. that is activated by the output of the current detector at each time, the equipment can be simplified.

Furthermore, when the current supplied to the plating tank is large, the power supply path to the plating tank can be shortened, thereby reducing construction costs and power loss.

Furthermore, since the composition of the plating solution in a plurality of plating tanks can be kept the same, there are many advantages such as eliminating variations in the quality of the plating solution from one plating tank to another and facilitating quality control.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing the principle of a DC current transformer. 1: Plating tank, 3: Circulation pump, 4: Adjustment tank,
6: Overflow port, 8: Anode, 9: Covering object, 11:
DC current transformer, 13: Current transformer, 16: Current detector,
18: DC current integration counter, 19: Fixed amount transfer device, 20: Container.

Claims (1)

[Scope of utility model registration request] A plating liquid circulation system consisting of a plurality of plating tanks, an adjustment tank, and a circulation pump, a DC current transformer formed by passing one of the positive and negative power supply lines to each plating tank to the DC side, and the DC current A current transformer that receives the AC side output of the current transformer, a current detector that detects the sum of the currents flowing through each of the power supply lines from the output of the current transformer, and integrates the output of the current detector. and a metering transfer device that is activated by the output of the DC current integrating counter and transfers a fixed amount of additive from the container to the adjustment tank. An additive replenishment management device for electroplating, which is characterized by: