JPS6033918B2 - Anode adjustment device for radial cell type electrolyzer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an anode adjustment device for a radial cell type electrolytic cell, and in particular to an anode adjusting device for a radial cell type electrolytic cell, and in particular for mounting a consumable electrode in the electrolytic cell, which is successively updated in order to compensate for a decrease in wall thickness due to elution in an electrolytic solution. We would like to propose an anode adjustment device for easily adjusting the positioning and holding of the electrode support, which controls the maintenance of false posture and the guidance of progressive movement during renewal under the transmission and conduction of large currents for electrolysis. It is something to do.

In general, radial cell electrolyzers are designed to accommodate extremely high efficiency electrolysis operations, particularly at high speeds, such as in continuous galvanizing lines for metal strip such as cold-rolled sheet metal. A rotary drum for energization with a diameter of about 100 mm is immersed in the plating solution for approximately half its circumference, and a metal strip is introduced into and out of the electrolytic cell via a deflector roll outside the tank, and then energized so as to be brought out and immersed in the bath. The plating liquid is passed around the outer circumference of the rotating drum for electrical application, and during that time, a large current is passed through the plating solution from the anode, which is placed facing the metal strip in the radial direction of the rotating drum for electrical current-carrying, with a current-carrying gap in between. Used to conduct electricity.

In this case, since electrolysis is carried out only on one side of the metal strip, it can be advantageously adapted to so-called single-sided plating, in which only one side is plated and the other side is left untreated. , in this kind of large-scale facility,
Since an extremely large amount of power is input, it is important to keep the above-mentioned energization gap as small as possible in order to reduce and suppress reactive power consumption.

By the way, in normal dew plating, 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. It is easy to manage as it can be expected to constantly replenish the plating metal components from the anode, and there is little gas generation on the electrode surface. It is particularly suitable for applications where a large current is applied to thicken the film.

However, in this case, as the anode plating progresses, it elutes, 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. Conventionally, in order to correct this energization gap sequentially, a large number of consumable electrode pieces each having an arcuate shape and partially surrounding the energizing rotating drum in the electrolytic cell can be moved sequentially along the cylindrical generatrix of the energizing rotating drum. are lined up horizontally, and this sequential movement is guided by a guide with a slope that brings the consumable electrode piece closer to the energizing rotating drum for each pitch by the amount of consumption of the electrode piece during that period, and this guide also moves the consumable electrode piece It is also useful for supplying power to the entire anode consisting of a group of

This guidance is finally called electrode support. Therefore, by sequentially moving the consumable electrodes, including the steps of attaching and detaching a new consumable electrode from one side of the energizing rotating drum and a worn out consumable electrode from the other side, the anode can be updated one by one with correction of the energizing gap. It will be done. Here, the electrode support is usually rectangular with a fairly large cross section (approximately 450 mm It mainly consists of a graphite rod formed into a 4507 x 4507 rib.

Conventionally, this electrode support is rigidly attached to the bottom of the electrolytic cell, since unless it is accurately positioned at the bottom of the electrolytic cell, the current-carrying gap cannot be properly maintained under the successive updates of the anode. It is held on a fixed pedestal as shown in FIGS. 1a and 1b, via a support trough whose core is an L-shaped steel with the V-shape 1 facing upward.

In the figure, 1 is a rotating drum for energizing, 2 is along the lower half of the drum,
A metal strip is being immersed in an electrolytic tank T, and 3 is a side of a consumable electrode piece 3' facing the rotating drum for current-carrying with a current-carrying gap G between it and the metal strip 2 in the radial direction. Anode 3
As shown in the figure, the center of the back of each consumable electrode piece 3' is placed so that it is opposite to the front and back of the bath immersion plate of the metal strip 2, which is indicated by the arrow in the figure, across the axis of the rotating drum for energization. The protrusion 4 formed in a raised manner locks the electrode support 5 so that it can be moved sequentially along the battle surface 6. It was installed. 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 width of the metal strip 2 is increased, for example, as 2', as shown in FIG. As shown in comparison with Figures a and b, the conduction gaps G' and G'' for the wide strip 2', especially near both ends of the anode 3, become narrower due to the depletion behavior of the anode 3 that occurred during the previous electrolytic process. This causes poor appearance due to uneven coating amount such as 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.

That is, the present invention provides a pair of support legs for moving the electrode support 5 back and forth in the radial direction of the current-carrying rotating drum at both ends of a support trough that positions and holds the electrode support 5 with a comb bottom. An operating device is provided that protrudes through the bottom under sealing and applies thrust to the protruding end of the support leg outside the tank.

Figures 3a and 3b also show embodiments of the invention, numbered 1 to 7.
1 shows the same parts as those explained in FIG. A pair of support legs 10 are provided at both ends of the support trough 7 for the above-mentioned forward and backward movement, and are made to protrude through a sealing means such as a stuffing box (simply illustrated in the figure), so that the protruding ends of the support legs can be connected to the outside of the tank. An operating device 11 such as a hydraulic cylinder or a jack is provided to apply thrust to the vehicle.

Therefore, the support trough 7 that holds the electrode support 5 at the bottom of the tank can arbitrarily guide the movement of the electrode support 5 back and forth in the radial direction of the current-carrying rotating drum at each of its ends. Appropriate matching of the conduction gaps 〇 and 〇' can be easily achieved in response to width changes and other variations in electrolytic conditions.

As described above, according to the present invention, the anode arrangement can be easily adjusted from outside the cell so that it takes the optimum position for the electrolysis operation conditions in a radial cell type electrolyzer. This greatly helps improve workability and efficiency.

[Brief explanation of the drawing]

Figures 1a and b are side views and cross-sectional views showing the electrode arrangement of a conventional example of a radial cell type electrolyzer, and Figures 2a and b are the fluctuation behavior of the silkworm gap due to changes in the width of the metal strip. FIGS. 3A and 3B are a side view and a sectional view of the electrode arrangement in an embodiment of the present invention. 1...Rotating drum for current supply, 2...Metal strip, 3...Anode, 3'...Consumable electrode piece, 5...Electrode support , 6... Battle face, 7... Support trough, 10... Support leg, 11... Operation device. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. A large number of arcuate-shaped rotary drums, each having an arcuate shape, face each other in the radial direction with a current-carrying gap between them and the metal strip. In a radial cell type electrolytic cell that is successively updated, the consumable electrode pieces are held by an electrode support that has mounting surfaces that are arranged side by side so that they can be moved progressively along the cylindrical generatrix of the energizing rotating drum. A pair of support legs for moving the electrode support back and forth in the radial direction of the energizing rotating drum are provided at both ends of the support trough, which is positioned and held at the bottom of the tank. 1. An anode adjustment device for a radial cell type electrolytic cell, characterized in that an operating device for applying a thrust to a protruding end of a support leg is provided.