KR20030053707A - High current capacity collector head with water jacket - Google Patents

Abstract

PURPOSE: A water cooling type collector head having less Joule heating and enabling stable high current conduction is provided to enable electroplating of high efficiency to be made by reducing contact resistance generated between bearing part and metal rings of the collector head, thereby suppressing Joule heating to the utmost. CONSTITUTION: The water cooling type collector head having less Joule heating and enabling stable high current conduction includes an intermediate metal ring(2) and an outer metal ring(3) tapered and oppositely connected to a bearing part(1) of rotating conductor roll; brush units(4,5,6) comprising a brush holder(4) contacted with the outer metal ring(3), a series of brushes(5) pressed by a certain pressure of spring so that the brushes(5) are contacted with the inner part of the brush holder(4), and brush holder bars(6) electrically connected to the brushes(5); a booth bar(10) contacted with the brush units(4,5,6) to supply current required for electroplating through sealing cases(7,8,9) of the outside; and a cooling water supply and recovery pipe(12) formed on upper and lower parts of the outer sealing cases(7,8,9,11) for housing the outer metal ring(3) and brush units(4,5,6).

Description

HIGH CURRENT CAPACITY COLLECTOR HEAD WITH WATER JACKET}

The present invention relates to a water-cooled collector head capable of small current generation and stable high current energization. More specifically, the contact resistance heat generated between the metal ring of the collector head and the collector head coupled to the current-rolling roll bearing unit is suppressed to the maximum, and The present invention relates to a water-cooled collector head that has a small resistance to generate high efficiency and electroplating with high efficiency by continually flowing coolant therein by forming a ring and a series of brushes in a sealed jacket.

In general, a device for continuously electroplating zinc, zinc alloy, nickel, nickel alloy, tin, copper, etc. for the purpose of improving the corrosion resistance of the metal band is a conductive roll for plating the electricity to the cathode as a cathode and the plating solution is immersed. The anode, which is opposed to the metal strip in the plating bath, consists of the main components. In the electroplating bath of such a structure, in order to continuously plate the metal band, the metal band is wound around the rolling roll rotating at the same circumferential speed as the traveling speed of the metal band or traveling while making surface contact. As shown, a metal ring (R, 2,3) made of copper or copper alloy with high electrical conductivity is mounted and then a current is applied to a series of brushes in contact with the surface of the metal ring (2,3). It is common to do The parts consisting of metal rings (2,3) and a series of brushes are called collector heads. When current is applied to the dust collector, the resistance is proportional to the product of the square of the applied current and the total electrical resistance between the brush and the bearing parts. Joule heating occurs.

If the resistance heat of the dust collector component is not removed by proper external cooling, the temperature of the dust collector and the bearing part in contact with the dust collector is continuously increased, thereby causing component damage due to overheating of a brush or a stretch wire connected thereto. Since the resistance heat generation of the dust collector and the bearing part increases in proportion to the square of the applied current, various cooling methods have been developed and used until now because the current density per unit area of the metal band has a higher current density.

In general, the bearing part of the current carrying roll is made of carbon steel or alloy steel in terms of strength, and the metal ring bonded to the bearing part is made of copper or copper alloy having excellent electrical conductivity. In addition, as the brush in contact with the metal ring, a carbon brush containing a large amount of metal grains having excellent electrical conductivity is used. The present inventors confirmed that the main resistance heat generation in the bearing part and the collector head of the current-carrying roll constituted as described above is due to the contact resistance at the joint part of the bearing part and the metal ring, the metal ring, and the brush. Among them, the brush in contact with the metal ring is almost constant in contact resistance because it always receives a certain range of compressive force by a spring or the like to maintain good contact. However, in general, the coefficient of thermal expansion of copper or copper alloy is 1.1 to 1.5 times higher than that of carbon steel or alloy steel, so once the temperature rises due to resistance heating of the brush or metal ring, the metal ring made of copper or copper alloy expands more and more. The contact resistance gradually increases by acting toward the distance away from. As a result, once the heat generation amount of the collector head exceeds the cooling amount, the contact resistance continuously increases, causing overheating of the collector head.

As shown in FIG. 1, the most basic method of suppressing heat generation of the dust collector and the bearing part of the current carrying roll is to install a cooling tube 21 parallel to the central axis of the bearing part 1 and to continuously cool the cooling water. There is a way to shed. However, in this case, since the diameter of the cooling tube 21 is limited in size in terms of the strength of the energizing roll, it is difficult to suppress a certain amount of heat generation. As a next method, a method of enclosing a dust collector and a brush in a box shape and air cooling by continuously blowing cold air from the outside is also used.

However, in this case, noise must be a problem because cooling compressed air must be injected at a high speed in order to obtain a predetermined cooling capacity, and cooling capacity has a certain limit. As a state-of-the-art technology to solve this problem, a method of wrapping the entire dust collector and the brush in a sealed jacket 22 as shown in FIG. 2 and flowing the coolant through the cooling tube 21 therein is known. This method is capable of supplying a large current of up to 30 to 40 mA per dust collector, so the application of the latest electroplating equipment that requires high current density plating to continuously running metal bands is increasing.

The water-cooled collector head has an advantage in that the dust collector and the brush are composed of a sealed jacket to continually flow the cooling water, thereby effectively suppressing heat generation due to the large current. However, in designing such a structure, the electrical resistance of the dust collector and the contact portion varies greatly depending on the coupling method of the bearing part and the dust collector and the material selection method of the dust collector. It is difficult to implement shorter equipment.

In order to solve the above problems, the present invention provides a contact resistance that is generated between the collector head metal ring coupled to the roll roll bearing portion in the configuration of a roll for current carrying in the high current density electroplating equipment required. Small heat generation and stable high current supply, which enables high efficiency electroplating in a short space by reducing the heat of resistance to the maximum and restraining the metal ring and the series of brushes in a sealed jacket. The purpose is to provide a water-cooled collector head as possible.

1 to 2 are schematic diagrams showing a conventional collector head;

Figure 3 is a schematic diagram illustrating the operation and principle of the water-cooled collector head capable of stable high current energization with a small resistance to heat generation according to the present invention;

Figure 4 is a precise design of the water-cooled collector head capable of stable high current flow with low resistance heat generation according to the present invention.

♣ Explanation of symbols for main part of drawing ♣

1: bearing part 2: middle metal ring 3: outer metal ring 4: brush holder

5: Brush 6: Brush holder rod 7, 8, 9: Sealed case 100: Booth bar

12: cooling water supply and recovery pipe

In order to achieve the above object, the present invention is an intermediate metal ring and the outer metal ring machined to have a taper in the opposite direction coupled to the bearing portion of the rotating current-carrying roll, and a brush holder in contact with the outer metal ring, A brush unit comprising a series of brushes pressed and contacted by a spring at a predetermined pressure therein, a brush holder rod electrically connected thereto, and a contact through an outer sealed case to supply a current required for electroplating to the brush unit. It is provided with a water-cooled collector head capable of small and stable heat generation and stable high current energization, characterized in that it consists of a bus bar, and a cooling water supply and recovery pipe formed in the upper and lower portions of the outer sealed case housing the outer metal ring and the brush unit. .

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 is a schematic diagram illustrating the operation and principle of a water-cooled collector head capable of stable high current energization with a small resistance to heat generation according to the present invention, Figure 4 is a water cooled collector head capable of stable current generation with a small resistance to heat generation according to the present invention Precision design.

As shown in Figures 3 to 4, the water-cooling collector head capable of stable high current flow with low resistance to heat generation according to the present invention, the bearing part 1 of the current-carrying roll is an intermediate metal ring tapered in opposite directions, respectively. (2) and a series of brushes (5), which are coupled by an outer metal ring (3), the outer metal ring (3) is pressed in contact with a constant pressure by a spring in the brush holder (4) again, A brush holder bar 6 electrically connected thereto and a structure in which a current required for electroplating is supplied from the bus bar 10 through the outer sealed cases 7, 8, and 9.

In addition, the outer metal ring 3 and the brush units 4, 5, and 6 are surrounded by the outer sealed cases 7, 8, 9, and 11, and the inner side of the metal ring 3 and the brush unit 4, 5, 6 are provided through the cooling water 12 supply and return pipes. The cooling water is continuously circulated. At this time, O-Ring (1) and Seal (15) are installed to prevent the coolant outflow to the outside as shown in the illustration, Pressure Relief Valve (13) so that the pressure of the coolant does not exceed a certain limit ) Can be installed.

On the other hand, the intermediate metal ring (2) and the outer metal ring (3) coupled to the bearing portion (1) is fixed ring (16, 17, 19) fixed to the bearing portion (1) to compensate for the change in dimensions due to thermal expansion It is configured to receive pressure in opposite directions by a spring bolt (Spring Bolt; 6, 19) coupled to.

As described above, the water-cooled collector head capable of stable high-current energization with a small resistance to heat generation according to the present invention comprises a double metal ring contacting the brush, and each metal ring has an inclination in opposite directions to each other, and opposites each other. It was confirmed that the design is effective in the structure that can give the pushing force in the direction.

In addition, the intermediate metal ring in contact with the bearing part of the current-carrying roll is installed in a wedge structure made of a material having a low hardness and a coefficient of thermal expansion of 99% or more similar to that of carbon steel and alloy steel. Considering the wear resistance, it was confirmed that the composition of the copper alloy with high hardness is more stable to lower the contact resistance and extend the life at each interface.

That is, as the intermediate metal ring, copper or copper alloy having an electrical conductivity of 80 to 110% IACs and a thermal expansion coefficient of 1.5 to 2.0 x 10 < -6 > or less was used. The outer metal ring had an electric conductivity of 50% IACs or more and a hardness of HRB 80. The above copper or copper alloy was used.

As described above, the present invention reduces the resistance generated by reducing the contact resistance generated between the collector head metal ring coupled with the roll roll bearing portion in the configuration of the roll for current carrying high current required in the high current density electroplating equipment The maximum restraint and the metal ring and a series of brushes are composed of a sealed jacket to continuously flow cooling water therein, thereby enabling high efficiency electroplating in a short space.

Claims (5)

A tapered intermediate metal ring (2) and an outer metal ring (3) which are respectively coupled to the bearing portion (1) of the rotating current-carrying roll in opposite directions; A brush holder 4 which contacts the outer metal ring 3, a series of brushes 5 which are pressed against a predetermined pressure by a spring in contact therewith, and a brush holder rod 6 electrically connected thereto. Units 4, 5, 6; A bus bar 10 which contacts the brush units 4, 5, 6 via an outer sealed case 7, 8, 9 so as to supply a current required for electroplating; It is composed of a cooling water supply and recovery pipe 12 formed in the upper and lower portions of the outer sealed case (7, 8, 9, 11) for accommodating the outer metal ring (3) and the brush unit (4, 5, 6) A water-cooled collector head with low heat generation and stable high current flow. The method of claim 1, The intermediate metal ring (2) and the outer metal ring (3) coupled to the bearing portion (1) is fixed to the fixed ring (16, 17, 19) fixed to the bearing portion (1) in order to compensate for the change in dimensions due to thermal expansion A water-cooled collector head capable of stable and high-current energization with low resistance to heat, characterized by being configured to receive pressure in opposite directions by the spring bolts (6, 19) to be coupled. The method of claim 1, Cooling water supply and recovery pipes 12 formed in the upper and lower portions of the sealing case (7, 8, 9, 11) is coupled to the O-ring 14 and the seal 15 to prevent the cooling water outflow, the limit of the constant pressure of the cooling water A water-cooled collector head capable of stable high current energization with low resistance to heat generation, characterized in that a pressure buffer valve (13) is installed to prevent the water from exceeding. The method according to claim 1 or 2, The intermediate metal ring (2) in contact with the bearing portion (1) of the energizing roll is characterized in that the thermal expansion coefficient is similar to the material steel of the bearing portion (1), consisting of 99% or more copper or copper alloy having a low hardness Water-cooled collector head with low resistance heat and stable high current. The method according to claim 1 or 2, The outer metal ring (3) is a water-cooled collector head capable of stable high current flow with low resistance to heat, characterized in that consisting of a copper or copper alloy with a hardness of HRB 80 for abrasion resistance upon contact with the brush (5).