JPS6144195A - Continuous electroplating line - Google Patents

Abstract

PURPOSE:To manufacture products of uniform quality with improved work efficiency by placing plural electroplating apparatus for exchange side by side with plural electroplating apparatus and exchanging properly the apparatus as required. CONSTITUTION:Plural electroplating apparatus are divided into groups A (A1, A2), B (B1, B2) and arranged, and plural electroplating apparatus A1', A2', B1', B2' are placed side by side with said apparatus. When the apparatus in the group A are exchanged, the feed of a plating soln. to the group A is stopped, the apparatus A1, A2 are removed from the line, and the apparatus A1', A2' are placed in the line. During this time, ordinary plating is continued in the group B. A strip 31 is stretched before the exchange, and conductor rolls 32, an upper electrode 35' and an upper plating bath 34' above the strip 31 and backup rolls 33, a lower electrodes 35 and a lower plating bath 34 under the strip 31 are separately exchanged. Thus, the exchange can be carried out in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a continuous electroplating line with replaceable electroplating equipment, such as metal strips.

(Prior art and its problems) Conventionally, as general examples of techniques for plating metal strips, horizontal type as shown in Fig. 6a, vertical type as shown in Fig. 6b, radial type as shown in Fig. 6C, and electroplating equipment have been used. Ta. As shown in these figures, a metal strip 61 is generally immersed and run through a plating bath containing a plating solution. TfS
In Figure 6, 62 is an energizing roll, 63 is a presser roll, and 64 is a plating tank.

65 is an electrode, and 66 is a plating bath.

A soluble or insoluble anode is used as the t-electrode 65, and electrolysis is performed using the energizing roll 62 with the metal strip 61 as a cathode.

In such a conventional example of plating equipment.

Due to the following reasons, its operation is significantly hindered and production efficiency is reduced.

(1) ifJ electrical roll 62 in ms diagram. Roll replacement due to problems such as plating solution adhering to the presser roll 63, foreign matter getting caught, or due to corrosion and wear.

(2) Replacing the electrode 65 due to melting of the electrode 8i65 or getting stuck with foreign matter.

(3) Replacement of the plating solution 66 due to deterioration or abnormality of the plating solution 66.In these cases, the electroplating line must be stopped for a long time to replace the solution, coupled with the recent demand for improved productivity. , this issue is becoming increasingly important.

Furthermore, there is a demand for diversification of surface-treated steel sheets, mainly in the automobile industry, and as an example, there is a need for manufacturing technology for a wide variety of surface-treated steel sheets on the same surface treatment line. Continuous electrolytic galvanizing includes not only zinc alone, but also zinc and iron, zinc and nickel, and other metals other than zinc.

These various types of plating cannot be performed unless a plating solution dedicated to each type of plating is used. Furthermore, if even a small amount of a different type of plating solution is mixed in, the plating quality will be impaired and the product value will be significantly reduced.

Therefore, when plating different types of plating on the same plating line, it is necessary to completely replace the plating solution in the plating tank when replacing the plating parts.

Electroplating! iJ the lt position! Figure 5 shows an example of the system adopted in an electrogalvanizing line.The number of strip coils inserted into payoff reel 51 in figure 0 is 4! The strip is modulated, the tip is cut with a 52 yen, and the leading strip is tagged and connected with a 53 welder. The welded strip passes through 54 loopers. This looper 54 precedes, during the time required to connect the 76 rows of strips.
Treatment of central section strips 9155.55';
This is a device for accumulating strips so as not to stop the strips passing through the 56°57.58.

The strip that has passed through the looper passes through plating pretreatment equipment such as degreasing, pickling, and rinsing at 55.55', and then passes through the plating pretreatment equipment at 56.57
The steel sheet is electroplated using an electroplating device such as No. 58, and then processed using a post-plating treatment device such as Linz No. 58 to become an electrogalvanized steel sheet. After that, it passes through the exit looper 54', is cut to a predetermined size by the exit shear 52', and is reeled into the tension reel 59.
The product is wound up into a product.

In the plating line shown in FIG. 5, when performing multi-layer plating using different types of plating solutions as described above.

It is necessary to replace the plating solution in the plating devices 56 and 57. This replacement work involves draining the previously used plating solution, thoroughly cleaning the inside of the plating equipment, and then supplying the currently used plating solution, which requires the line to be stopped for a long time.

(Objective of yA + Month) The object of the present invention is to provide the electroplating apparatus described above by having a plurality of plating bath rows as a plurality of independent plating systems in a continuous electroplating line. The purpose is to provide a continuous electroplating line that solves the problem of long-term line stoppages during replacement, improves operating rates, and stabilizes quality.

<Structure of the Invention> The present invention includes a plating pretreatment device, an electroplating device for multiple plating, a replacement electroplating device juxtaposed next to the electroplating device for plating, and at least the electroplating device for plating. In a continuous electroplating line having a pair of plating materials installed in T for plating
F. The pneumatic plating device and the replacement electroplating device can be separated at the time of replacement l1lf, with the material to be plated being tensioned by the material tensioning device described in +iii.

When replacing electroplating equipment, remove the separated electroplating equipment from the plating line for replacement while leaving at least one electroplating equipment in operation, and place the replacement electroplating equipment in the plating line. You can shift to put it in.

The replacement 1' [t% plating device installed in the plating line is configured so that it can be joined to the plating material so that it can be plated while releasing the tension on the plating material caused by the plating material tension device. It provides a continuous electroplating line.

Hereinafter, 411 of the present invention will be explained in detail.

The continuous electroplating line of the present invention will be explained in detail using preferred embodiments shown in FIGS. 1 to 4.

Figure 1 shows the electroplating of the present invention? C equipment part line structure
This is an It diagram, and has independent A and B systems of plating tanks, and is configured so that when replacing the electroplating apparatus, one of them is operated while the other is replaced. Therefore, the electroplating line will not be stopped even when the plating equipment is replaced.
It is a partially enlarged view of the system. Currently, Al, A2. Bl,
B2. This is a plating tank group built into the plating line, and Al', A2', B,', and B2' are replacement plating tank groups. When replacing, A1', A2
'or B1 ', B2' A, A2 or Bl which has stopped the plating operation.

Exchange with B2.

:1S2V! In J, 21 is a strip, 22 is a conductor roll for supply 7rL, 23 is a 7rL conductor roll, and 23 is a 7rL conductor roll.
Le, 24 is me! 25 is an electrode, 26 is a plating solution supply pump, and 27 is a plating solution circulation tank. Furthermore, 2B is a plating solution supply pipe, and although it is not shown in the figure, it is a matter of course that a discharge pipe -A is also provided. When a potential difference is created between the electrode 25 and the conductor roll 22, a current flows between the strip 21 and the electrode 25 through the plating solution, and the surface of the strip 21 in contact with the plating solution is plated. It will be applied. Plating treatment is the fifth step.
In the continuous electroplating line shown in the figure, the electroplating apparatus of the present invention is installed at 56 and 57.

In the conventional example, (1) Periodic replacement (conductor roll, anode, plating solution, etc.) (2) Sudden replacement (conductor roll, anode, etc.)

(3) When switching to 94N plating, it was necessary to stop the plating line for more than 4 hours even in a plating bath with a cleaning device, and for more than 12 hours in plating without cleaning IItn.

2fl series of the present invention? In the lt% plating line, the above (
Even in the cases of +), (2), and (3), it is possible to carry out each work without stopping the line, and the line operating rate increases dramatically.

The operating principle of the continuous electroplating line of the present invention will be explained with reference to FIGS. 1 to 4, taking the periodic replacement portion as a representative example.

From the plating processing state shown in Fig. 1, if several units are to be used regularly, the plating processing equipment should be group A (AI, A2...),
It is divided into group B (B+, B2...) and 1 usually,
In the stable state, only one of the groups is used, for example AHK, and it is assumed that the current group has reached the periodic replacement period.

・In advance, maintenance-completed spare plating processing equipment A+ ′, A is installed at the positions Al ′, A2 ′, etc.
z ′... is placed. 0 Next, stop supplying the plating solution to AJT and perform normal plating in group B. 1 Next, A
Remove the plating tanks A, A2... of D from the plating line, and AI the plating zelkova of A, ', A2'...

Insert it in position A2... and replace it.

Figures 3a and 3b show normal plating and plating, respectively. The replacement of the plating tank, which indicates when to replace the tm, is as follows:
Horizontal IW plating is carried out in a direction extending from the strip 31, separated by the strip 31 into a plating device section above the strip 31 and a lower plating device section below the strip 31. The device is shown as a representative example, and the lower plating device part is a backup roll 33.
, strip 31 with lower plating tank 34 and lower electrode 35
Moved further upwards, "Three-way plating JAIi! The part is the energizing roll 32. The upper plating bath 34' and the double l4i 35' are moved below the strip 31.

When separating such upper and lower plated portions from the strip 31, it is preferable to do so while applying tension to the strip 31 with rolls 41, 42, 43 shown in FIG. 4a. Not limited to those of
The same applies to the vertical type and radial type shown in FIGS. 6b and 6C, in which parts of the plating apparatus on the same side of the strip are shifted in a direction away from the strip for replacement.

In addition, the upper and lower plating equipment parts that are in operation are transported out of the plating line, and replacement upper and lower plating equipment are installed.
Any conventionally known operating device ζ can be used for carrying the portion a into the plating line.

By moving the plating apparatus in parallel in the direction perpendicular to the line while maintaining the state shown in FIG. 3b, the plating apparatus can be carried out of the line (see FIG. 4b).

Replacement plating tanks AI', A2"...
However, it is possible to move inside the line. (See Figure 4b).

These operations are carried out simultaneously, and during this time, the plating operation is continued in group B while maintaining appropriate tension in roll groups 41 and 42 shown in FIG. 4a.

The above theory of IJI was given as an example of periodic replacement (1) above, but the same method can also be used for (2) sudden replacement and (3) change of different plating.

However, to add a little more detail to case (3), in the case of different rice plating, mixing of the plating solution with a very small amount of fleas is not allowed.
As shown in Figure 4b, plating solution tanks 44, 44',
A plating solution supply piping system including a 2Ja ring pump 45, 45', a pipe line 46, 46', a connector 47, 47', etc. must be provided independently for each type of plating solution.

(Example) Using a strip with a thickness of 0.81 mm and a width of 10100 mm, horizontal plating VC,i as shown in FIG.
Next, electrogalvanizing was performed. Six plating baths were used as An, and four plating baths were used as Group B.

After plating for 50 hours using Group A, the plating solution supply to Group A was stopped, and while plating continued with Group B, the plating tank of Group A was replaced with the plating barrel of Group A' as described above. . The time required for replacement is 5 minutes after stopping the plating solution supply to group A until the plating solution supply to group A' reaches a steady state again, whereas conventionally it required at least 4 hours. Compared to this, work efficiency has been greatly improved and line efficiency has increased.
The JJ rate has increased dramatically.

Moreover, while the plating equipment is being replaced, the plating line is continued continuously by the plating equipment of group B, so there is no need to interrupt the strip running, greatly increasing work efficiency and improving quality even when plating long strips. remains constant.

Furthermore, after single zinc plating was performed using the same strip, zinc-nickel alloy plating could be performed on the same line without stopping the line.

(Effects of the Invention) According to the continuous plating apparatus of the present invention, the plating apparatus can be replaced without interrupting the plating process, which prevents foreign matter from getting into the rollers, corrosive wear of the rollers, electrodes, etc. In the event of a problem such as a component abnormality, the plating equipment can be quickly replaced (in 6 minutes) without stopping the plating line.Also, if the plating equipment needs to be replaced periodically, the plating line can be stopped. It is possible to replace the plating equipment in an extremely short period of time without having to change the plating equipment.It is also possible to change over to different types of plating, so it is possible to change the line according to the needs of the product in one plating line. You can change the type of As described above, according to the present invention, it is possible to critically improve the efficiency of plating work and to obtain a plating product of constant quality.

[Brief explanation of the drawing]

FIG. 1 is a partial line configuration diagram of the 'B1 continuous plating apparatus of the present invention. Figure 2 shows plating A used in Figure 1.
FIG. FIGS. 3a and 3b are diagrammatic cross-sectional views showing the state of the plating device before and after separation, respectively, when replacing the plating device with a replacement plating device. Figure 4a shows that when the plating equipment of one group is replaced, the plating equipment of the other group is replaced! ! FIG. 3 is a diagram illustrating a state in which plating is performed in the apparatus and tension is applied to a strip in one group of plating apparatuses. Figure 4b is especially suitable for dissimilar plating! / ] is a diagram for explaining the piping system at the time of replacement. FIG. 5 is a diagram showing a continuous electroplating line. Fig. fjSsa, Fig. J46b and Fig. 6C are diagrammatic cross-sectional views of conventionally used horizontal type, vertical type and radial type plating apparatuses, respectively. Explanation of the sign? ■...Street Ip, 22...Conductor roll for power supply. 23...Ba, Ri7prol, 24...Plating tank. 25...TL pole, 26...Plating solution supply pump. 27...Circulation tank. 28... Plating solution supply piping, 31... Strip. 32... Conductor roll, 33... Backup roll, 34... Lower part! ! Tank, 34'...upper pegs. 35...Lower electrode, 35'...Upper electrode, 41.42
．． 43...Roll group. 44.44'...Circulation tank. 45.45'...Plating solution piping system pump, 46.4
6'...Pipeline, 47.47'...Connector. 51...Payoff reel, 52.52'...Shear, 53...Welding machine. 54.54'... Louver, 55.55'... Plating pre-treatment device, 56.57.
...111t% plating equipment. 58... Plating post-processing device, 59... Tension reel, 61... Strip. 62... Current roll, 63... Presser roll, 64
...Plating tank, 65...Electrode. 66...Plating solution FIG, 1

Claims (1)

[Scope of Claims] A plating pretreatment device, a plurality of electroplating devices for plating, a replacement electroplating device juxtaposed next to the electroplating device for plating, and at least the electroplating device for plating installed in between. A continuous electroplating line having a pair of plating material tension devices, a plating solution piping system that circulates and supplies a plating solution to the plating electroplating device, and a plating post-processing device, the plating device and The replacement electroplating device can be separated at the time of replacement with the material to be plated tensioned by the material tension device, and when the electroplating device for plating is replaced, at least one electroplating device for plating is in operation. The separated plating electroplating equipment can be removed from the plating line for replacement and the replacement electroplating equipment can be shifted into the plating line while
A continuous electroplating line characterized in that a replacement electroplating device placed in the plating line is configured so that it can be joined to the material to be plated while releasing the tension on the material to be plated by a tension device for the material to be plated. .