JPS6058317B2 - Current flow gap adjustment device for assembly electrode support device of radial cell type electrolyzer - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an energization gap adjustment device for an assembled electrode support device in a radial cell type electrolytic cell.
The consumable electrode pieces, which are to be replaced one after another, are kept in place in the electrolytic cell and guided to be moved sequentially during renewal. The assembled electrode consisting of the group of consumable electrode pieces placed in the electrolytic cell is kept in a suspended position in the electrolytic cell, and the multi-processed metal strip is passed through the bath along the energizing rotating drum in the electrolytic cell. The purpose is to make it possible to easily adjust the energization gap between the two during operation.

In general, radial cell electrolyzers are designed to be particularly suitable for high-speed and therefore highly efficient electrolysis operations, such as in continuous galvanizing lines for metal strips such as cold-rolled sheets. A rotating drum with a large outer diameter for energization is immersed in the plating solution over approximately half its circumference, and a metal strip is introduced into and out of the electrolytic tank via a deflector roll outside the tank, and then brought out to pass through the bath. During this time, the coils are wound around the outer periphery of the energizing rotating drum so that the energizing drum is immersed, and during that time, each pair is formed in a bisected area of the immersed circumferential surface of the energizing rotating drum, and in the radial direction of the drum. It is used to pass a large current through a plating solution from an anode that faces the metal strip with a uniform current-carrying gap in between.

In this case, since electrolysis is performed only on one side of the metal strip, it is also advantageous for so-called single-sided plating, where only one side is plated and the other side is left untreated. In this type of large-scale facility, an extremely large amount of power is input, so it is essential to keep the above-mentioned power supply gap as small as possible in order to reduce and control reactive power consumption. be.

By the way, in normal electroplating, there are cases where an insoluble electrode is used as an anode, and cases where the metal to be plated is used as a soluble electrode, and in the latter case, maintenance and management of the plating solution is particularly important. It is convenient because it can be expected to constantly replenish the plating metal component from the anode, and there is little gas generation on the electrode surface, so it is particularly suitable for applications where thick plating is performed by applying a large current.

However, in this case, the anode elutes as plating progresses, and as the thickness decreases, the current carrying gap gradually expands.
The current density gradually decreases due to the increase in current-carrying resistance there, and as a result, the amount of plating deposit gradually decreases.

Therefore, in the above-mentioned plating method using a soluble electrode, it is necessary to successively correct the expansion of the current conduction gap in response to wear of the electrode over time. In order to successively correct this energization gap, conventionally, a large number of consumable electrode pieces each having an arcuate shape and partially surrounding the energizing rotating drum in the electrolytic cell are sequentially fed along the cylindrical generatrix of the energizing rotating drum. The guides are movably arranged side by side, and the guides are sloped so that the progressive movement approaches the energizing rotating drum by the amount of wear of the electrode piece during each pitch. This guidance also serves to feed the entire anode consisting of a group of consumable electrode pieces.

This guide is often referred to as an electrode support. Therefore, new consumable power is consumed on one side of the energizing rotating drum! By sequentially moving the consumable electrode, including the steps of attaching and detaching the pole piece and the worn out consumable electrode piece from the other side, the assembled electrode, that is, the anode, is successively updated with correction of the current carrying gap.

The electrode support is usually made of a fairly large rectangular cross-section (approximately 450 mm x450Tn!n) is mainly formed from a graphite rod. This electrode support must be precisely positioned at the bottom of the electrolytic cell to properly hold the current-carrying gap under the successive updates of the anode, so conventionally this electrode support is rigidly attached to the bottom of the electrolytic cell. Figures 1A and b are attached to the fixed pedestal via a support trough made of L-beam core with an upward V-groove.
It is retained as follows.

In the figure, 1 is a rotating drum for energization, 2 is along the lower half of the drum,
A metal strip is passed through the bath immersion plate inside the electrolytic tank T, and 3
1 shows an anode consisting of a horizontally arranged group of consumable electrode pieces 3'' facing a metal strip 2 in the radial direction with respect to the current-carrying rotary drum 1, with a current-carrying gap G between them. A protuberance is formed at the center of the back surface of each consumable electrode piece 3'' so as to sandwich the axis of the energizing rotating drum 1 and to oppose the front and back of the bath immersion plate of the metal strip 2 shown by the arrow in the figure. The protrusion 4 locks the electrode support 5 so that it can be moved sequentially along the mounting surface 6, and the electrode support 3 is firmly attached via the support trough 7 to the fixed pedestal 8 installed on the tank bottom. However, in this case, even when the electrode support 5 that sets the current carrying gap G of the anode 3 is properly positioned, if the plate width of the metal strip 2 is increased, for example by 2'', Then, as shown by comparing FIGS. 2A and 2B, the current conduction gap G"G" relative to the wide strip 2", especially near both ends of the anode 3, is affected by the wear behavior of the anode 3 that occurred during the electrolysis process up to that point. It becomes narrower at the bottom, which causes poor appearance due to uneven coating amount due to edge overcoat.

Therefore, the present invention has been developed to enable appropriate adjustments to be made in accordance with the above-mentioned fluctuations in plating operating conditions.
The supporting means for the electrode support 5 is devised.

In other words, the present invention provides a method for dividing the immersion half circumference of a current-carrying rotary drum into two equal parts in a tank filled with an electrolytic solution, for passing a metal strip through the bath. A group of consumable electrode pieces each having an arcuate shape are arranged concentrically with the energizing rotating drum facing the metal strip along the circumferential surface with a radially uniform energizing gap in between, and are arranged along the cylindrical generatrix of the energizing rotating drum. In an electrode support device for assembling a radial cell type electrolytic cell, a pair of electrode supports each having a horizontally arranged mounting surface that can be moved sequentially is held, and consumable electrode pieces are sequentially renewed by the sequential movement. A hanging hand is provided on the pedestal that maintains the hanging position, and the hanging hand rises above the bath surface, and then extends downward beyond the upper edge of the tank wall of the electrolytic cell, and then attaches the lower edge of the hanging part to the consumable electrode. An energization gap adjustment device for an assembled electrode support device in a radial cell type electrolytic cell, characterized in that a translation guide for holding a group of energized rotating drums in a concentric manner so that they can advance and retreat is fixed to the tank wall with a bracket. be.

FIG. 3 illustrates the arrangement of the anode 3 embodying the present invention in an electrolytic cell (not shown), where 9 is a pedestal that maintains a suspended posture in the bath via the support trough 7 of the electrode support 5. The pedestal 9 has a pair of clevises 11a on its end piece 10,
11b is provided and connected to the bifurcated leg end of the hanger 12 with a pin 12'', and the hanger 12 rises from the bath surface in the electrolytic tank (not shown in the figure) and further extends over the upper edge of the side wall of the tank. The lower edge 14 of the hanging portion 13 extending downwardly can move back and forth along a translation guide 15 fixed to the outer surface of the side wall.

Reference numeral 16 in the figure is its operating handle. Operation handle 16
As shown in FIGS. 4A and 4B, the worm gear box 18 is attached to the bracket 17 welded to the side wall W of the electrolytic cell T.
The worm shaft is wedged to the end of the worm shaft in the gear box 18, and the lower edge 14 of the hanging part 13 is held between the end piece 20 of the screw jack stem 19, which is operated by the engagement of the worm and the worm gear in the gear box 18. ``While connecting with
The lower edge 14 of the hanging portion 13 has a slot. The slider 21 is provided to have an inverted T-shaped cross section, and the translation guide 22 that guides the sliding movement of the slider 21 is connected to a bracket 23 on the side wall W.
Place it on top.

In the figure, 24 is a sliding distance indication scale, and 25 is a pointer.
The moving direction of the slider 21, and thus the hanging part 13, is set parallel to the radial surface of the energizing rotating drum 1 including the center of the electrode support 5, as shown in FIG. 4b, so that the metal strip of the anode 3 The expansion and contraction of the current-carrying gap facing the tank 2 can be easily adjusted by operating outside the tank without causing any vertical asymmetry.

In this adjustment operation system, individual operations are applied at both ends of the electrode support 5, so that by such operation, the electrode support 5 can be subjected to change adjustment with respect to the slope with respect to the generatrix of the rotating drum 1 for energization. , easily adaptable to various metal strip widths, consumable electrode pieces 3″
It is also expected that the anode consumption rate will improve through the effective use of fuel.

As described above, according to the present invention, the current-carrying gap facing the metal strip of the assembled electrode can be arbitrarily adjusted from outside the tank along the direction of the plate thickness to achieve matching of the electrolytic conditions. It is particularly effective in alleviating the tendency for edge overcoat to occur, which is a problem when expanding the width of metal strips, and in improving the consumption rate by optimizing the cost of consumable electrodes that lead to their being scrapped. Helpful.

[Brief explanation of the drawing]

Figures 1A and b are side views and cross-sectional views showing the internal arrangement of a conventional radial cell type electrolytic cell, and Figures 2A and b are the occurrence of edge overcoat as the width of the metal strip increases during processing. FIG. 3 is an external view of the arrangement inside the tank showing a specific example of the present invention, and FIGS. 4A and 4B are a side view and an end view of the adjustment device operating system. 1...Rotating drum for current supply, 2...Metal strip, 3...Assembling electrode (anode),
3″... Arcuate consumable electrode, 5... Electrode support, 6... Placement surface, 7... Support support, 9... Receiving Stand, 12... Hanging hand, 1
3...Hanging part, 14...Lower edge, 22...
...Translation guide, 23...Bracket.

Claims (1)

[Claims] 1. For each region that divides the immersion half-circumference of the energizing rotating drum, which controls the bath immersion plate of the metal strip in the tank filled with electrolyte into two, along the circumferential surface of the drum across both regions. A group of consumable electrode pieces, each arcuate in shape, are arranged concentrically with the energizing rotating drum, facing the metal strip across a radially balanced energizing gap, and can be moved sequentially along the cylindrical generatrix of the energizing rotating drum. In an electrode support device for assembling a radial cell type electrode bath, which is held by a pair of electrode supports with side-by-side mounting surfaces and sequentially updates consumable electrode pieces by sequential feeding, the electrode support is maintained in a suspended position in the bath. A hanging hand is provided on the pedestal, and the lower edge of the hanging part that rises above the bath surface and extends downward outside the electrolytic cell after passing over the upper edge of the tank wall of the electrolytic cell is connected to the energizing rotation of the group of consumable electrode pieces. 1. An energization gap adjustment device for an assembled electrode support device in a radial cell type electrolytic cell, characterized in that a translation guide for holding the drum so that it can move forward and backward in a concentric relationship with the drum is fixed to the tank wall with a bracket.