Lightweight large-diameter cathode roller for electrolytic copper foil production

Abstract

The application discloses a light-weight large-diameter cathode roller for electrolytic copper foil production, wherein a titanium cylinder and a supporting cylinder are connected through threads, and the thread surfaces are silver-plated to increase the contact conductive area of the two, reduce the energy consumption of contact resistance and local hot spots, and be beneficial to the uniform distribution of the current on the surface of the titanium cylinder; the inner wall of the supporting cylinder is provided with a grid-shaped conductive path composed of side conductive aluminum plates, center conductive aluminum plates, annular ribs and axial ribs, so that the current on the surface of the titanium cylinder of the cathode roller is conducted to an aluminum alloy shaft through the supporting cylinder, and then conducted out of the cathode roller through the aluminum alloy shaft, and the uniformity of the current on the surface of the titanium cylinder of the cathode roller and the 9000 A / m 2 Above working current density. The application adopts aluminum alloy as conductive material and structural strength material, has simple structure, and reduces weight by more than 35%, reduces the problems caused by turning, hoisting, overturning, transfer, transportation and driving in production and use, improves the bright surface quality of the copper foil produced by the large-diameter cathode roller, and guarantees the surface density index.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electrolytic copper foil equipment manufacturing, and particularly relates to a cathode roller with a diameter greater than 3000 mm for electrolytic copper foil production. BACKGROUND

[0002] As one of the basic materials for the electronic industry, electrolytic copper foil is mainly used for manufacturing printed circuit boards (PCB), copper-clad laminates (CCL), lithium ion batteries, energy storage batteries, etc. Electrolytic copper foil is generated by electrolysis. Under the action of an applied direct current field, copper ions in the electrolyte in the anode tank of the foil generator are continuously electrodeposited onto the surface of a rotating cathode roller. After deposition to a certain thickness, the electrolytic copper foil is produced continuously through stripping, surface treatment, and winding.

[0003] The cathode roller, as a carrier for generating electrolytic copper foil, is a rotary body structure with shafts at both ends and a cylindrical middle part. It is mainly composed of steel materials for internal support strength, copper materials for electrical conduction, and titanium materials for external corrosion prevention and foil generation. The larger the diameter and the wider the width, the more the area involved in electrolytic foil generation, and the higher the production efficiency. As the core equipment for electrolytic copper foil production, the specifications, conductivity, and grain size of the cathode roller are related to the production efficiency, economic benefits, and product quality of the copper foil. For a long time, they have been the core and focus of attention for copper foil enterprises. After more than 30 years of development, the diameter of the cathode roller has increased from 1500 mm to the current 3600 mm, and the foil generation efficiency of the cathode roller has been greatly improved. However, as the diameter of the cathode roller becomes larger and larger, the weight of the cathode roller doubles, leading to various problems in the manufacturing and use of the cathode roller: the difficulty of lifting, turning, transporting, and transporting between different processes during the manufacturing of the cathode roller increases; the cathode roller cannot be machined at a high speed during surface turning and polishing, affecting the surface machining quality and efficiency and reducing the quality of the produced copper foil; a larger power motor is required to drive the cathode roller during electrolytic foil generation, causing the cathode roller drive system of the foil generator to occupy too much space, affecting the uniform rotation of the cathode roller for foil generation, and causing the key indicator of the produced copper foil, the surface density, to be out of tolerance; stricter requirements are placed on the support structure, foundation, and storage floor bearing of the cathode roller of the foil generator, increasing unnecessary copper foil production costs. The above-mentioned problems caused by the significant increase in the weight of the cathode roller with a larger diameter have brought more trouble to electrolytic copper foil equipment manufacturing enterprises and electrolytic copper foil production enterprises.

[0004] A rotating cathode roller drum for electrolysis disclosed in the invention patent with publication number CN 101928978 B comprises an outer cylinder and an inner cylinder, the inner cylinder is made of aluminum alloy, and a net-shaped conductive plate is distributed on the inner surface of the inner cylinder, so that the inner cylinder is not overheated under large current, the generation of hot spots is inhibited, and the contact normal stress, overall rigidity and heat dissipation performance of the rotating cathode roller drum for electrolysis are improved. The patent mainly utilizes the characteristics of high thermal expansion rate and good electrical conductivity of aluminum alloy, so that the joint part of the inner and outer cylinders increases in normal pressure during work, and the generation of hot spots is inhibited. However, the patent does not solve the problem of lightweight of the large-diameter cathode roller, nor does it solve the problem of overall structure and electrical conductivity of the aluminum alloy cathode roller meeting the requirements of foil production. SUMMARY

[0005] In order to solve the problem that the larger the diameter of the cathode roller is, the heavier the weight is, and the problem that the hoisting, overturning, transfer and transportation of the cathode roller in the manufacturing and electrolytic foil production process affect the surface processing quality and processing efficiency, the present application provides a lightweight large-diameter cathode roller for electrolytic copper foil production.

[0006] The present application comprises an aluminum alloy shaft, two titanium sleeves, two titanium sheaths, two titanium plates, two side conductive aluminum plates, a support cylinder made of aluminum alloy and a center conductive aluminum plate. The support cylinder is sleeved on the aluminum alloy shaft, the two side conductive aluminum plates are respectively sleeved on the aluminum alloy shaft, and the outer circumferential surfaces of the side conductive aluminum plates are respectively attached to the inner circumferential surfaces of the two ends of the support cylinder. The two titanium sleeves are respectively sleeved on the surface of the aluminum alloy shaft and are respectively located outside the two side conductive aluminum plates, so that the end faces of the side conductive aluminum plates are respectively attached to the end faces of the side conductive aluminum plates at the locations. The two titanium plates are respectively sleeved on the outer circumferential surfaces of the titanium sleeves and are located on one side of the outer end faces of the side conductive aluminum plates, and the titanium plates are respectively fixedly connected to the side conductive aluminum plates at the locations by titanium bolts and counterweight rods. The two titanium sheaths are respectively sleeved on the outer circumferential surfaces of the titanium sleeves and are respectively located outside the titanium plates, and the inner end faces of the titanium sheaths are attached to the outer end faces of the titanium plates at the locations. The outer end of the titanium sheath is welded to the outer circumferential surface of the titanium sleeve, and the inner end of the titanium sheath and the titanium sleeve are respectively welded to the titanium plate.

[0007] The center conductive aluminum plate is located in the support cylinder and is sleeved on the outer circumferential surface of the aluminum alloy shaft 1, and the center conductive aluminum plate is located at the axial symmetry plane of the support cylinder.

[0008] The inner wall surface of the support cylinder is uniformly distributed with conductive paths. Each conductive path consists of two side conductive aluminum plates, a central conductive aluminum plate, multiple annular ribs, and multiple axial ribs. The annular ribs are arranged axially along the inner circumference of the support cylinder, with a center-to-center distance of 600 mm between adjacent annular ribs. The axial ribs are arranged circumferentially along the inner circumference of the support cylinder, with an included angle of 15° between adjacent axial ribs. A grid of conductive paths is formed by the perpendicular intersections of the annular and axial ribs. Both ends of each axial rib are fixedly connected to the side conductive aluminum plate 5 at their respective ends.

[0009] The aluminum alloy materials constituting the conductive path have a conductivity > 40% IACS and a resistivity < 0.04 Ω·mm at temperatures ranging from 20°C to 70°C. 2 / m.

[0010] The central conductive aluminum plate has cylindrical bosses on both ends to increase its conductive area. The axial height of each boss is 10mm, and its outer diameter is 1300mm. The central conductive aluminum plate is located inside the support cylinder and at its axial symmetry plane. The distance between the central conductive aluminum plate and the side conductive aluminum plates at both ends of the support cylinder is 600mm. The inner circumferential surface of the central conductive aluminum plate is fixedly connected to the circumferential surface of the aluminum alloy shaft; the outer circumferential surface of the central conductive aluminum plate is fixedly connected to the inner surface of the support cylinder.

[0011] The cross-sectional area of ​​the small-diameter section of the aluminum alloy shaft is greater than the minimum cross-sectional area S1 required for the aluminum alloy shaft to conduct electricity. The minimum cross-sectional area S1 is determined by (2).

[0012] S1=I / 2(K1·J) (2)

[0013] In the formula: S1 is the minimum conductive cross-sectional area required for the aluminum alloy shaft to conduct electricity, in mm. 2 I is the design total current of the cathode roller, in A; K1 is the cross-sectional conductivity correction factor, with a value of 1 to 1.5; J is the current density of the aluminum alloy, in A / mm². 2 .

[0014] The total design current I is calculated using formula (1):

[0015] I = 1 / 2·k·s·j (1)

[0016] In the formula: I is the total design current of the cathode roller, in A; k is the correction factor for the total design current of the cathode roller, with a value of 1 to 2; s is the outer circumference area of ​​the designed cathode roller titanium cylinder, in mm. 2 j represents the current density of the titanium cylinder material, in A / mm². 2 .

[0017] The minimum contact conductive area S of the side conductive aluminum plate and the supporting cylinder is determined by formula (3-1) ′ n :

[0018] S ′ n ＝ I / [(n+m)·K2·J] (3-1)

[0019] The minimum contact conductive area S of the side conductive aluminum plate and the aluminum alloy shaft is determined by formula (3-2) ″ n :

[0020] S ″ n ＝ I / [(n+m)·K2·J] (3-2)

[0021] In the formula, S ′ n is the minimum contact conductive area of the side conductive aluminum plate and the supporting cylinder, with the unit of mm 2 ; S ″ n is the minimum contact conductive area of the side conductive aluminum plate and the aluminum alloy shaft, with the unit of mm 2 ; I is the designed total current of the cathode roller, with the unit of A; n is the total number of the side conductive aluminum plates contained by the cathode roller; m is the total number of the center conductive aluminum plates contained by the cathode roller; K2 is the contact conductive correction coefficient, with the value of 0.5-1; J is the current density of the aluminum alloy, with the unit of A / mm 2 .

[0022] The minimum conductive cross-sectional area S of the side conductive aluminum plate contained by the cathode roller is determined by formula (4) n :

[0023] S n ＝ I / [(n+m)·K1·J] (4)

[0024] In the formula, S n is the minimum conductive cross-sectional area of the side conductive aluminum plate, with the unit of mm 2 ; I is the designed total current of the cathode roller, with the unit of A; n is the total number of the side conductive aluminum plates contained by the cathode roller; m is the total number of the center conductive aluminum plates contained by the cathode roller; K1 is the cross-sectional conductive correction coefficient, with the value of 1-1.5; J is the current density of the aluminum alloy, with the unit of A / mm 2 .

[0025] The minimum conductive cross-sectional area S2 of the supporting cylinder contained by the cathode roller is determined by formula (5)

[0026] S2 = I / (K1 · J) (5)

[0027] In the formula, S2 is the minimum conductive cross-sectional area required for the support cylinder to conduct electricity, in mm 2 ; I is the designed total current of the cathode roller, in A; K1 is a cross-sectional conductive correction coefficient, with a value of 1-1.5; and J is the current density of the aluminum alloy, in A / mm 2 .

[0028] The minimum contact conductive area S ′ m of the center conductive aluminum plate with the support cylinder is determined by formula (6-1)

[0029] S ′ m ＝ I / [(n + m) · K2 · J] (6-1)

[0030] The minimum contact conductive area S ″ m of the center conductive aluminum plate with the aluminum alloy shaft is determined by formula (6-2)

[0031] S ″ m ＝ I / [(n + m) · K2 · J] (6-2)

[0032] In the formula, S ′ m is the minimum contact conductive area of the center conductive aluminum plate with the support cylinder, in mm 2 ; S ″ m is the minimum contact conductive area of the center conductive aluminum plate with the aluminum alloy shaft, in mm 2 ; I is the designed total current of the cathode roller, in A; n is the total number of side conductive aluminum plates included in the cathode roller; m is the total number of center conductive aluminum plates included in the cathode roller; K2 is a contact conductive correction coefficient, with a value of 0.5-1; and J is the current density of the aluminum alloy, in A / mm 2 .

[0033] The minimum conductive cross-sectional area S m of the center conductive aluminum plate of the cathode roller is determined by formula (7)

[0034] S m ＝ I / [(n + m) · K1 · J] (7)

[0035] In the formula, S m is the minimum conductive cross-sectional area of the center conductive aluminum plate, in mm 2I is the design total current of the cathode roller, unit A; n is the total number of side conductive aluminum plates contained by the cathode roller; m is the total number of center conductive aluminum plates contained by the cathode roller; K1 is a cross-section conductive correction coefficient, the cross-section conductive value is 1~1.5; J is the current density of the aluminum alloy, unit A / mm 2 .

[0036] The application provides a light-weight large-diameter cathode roller for electrolytic copper foil production, a titanium cylinder and a supporting cylinder of the cathode roller are assembled in a threaded connection mode, and the threaded surfaces are subjected to silver plating treatment, so that the contact conductive area of the two is increased, the energy consumption and local hot spots of the contact resistance of the cathode roller are reduced, and the uniform distribution of the surface current of the titanium cylinder of the cathode roller is favorable; the inner wall of the supporting cylinder of the cathode roller is uniformly distributed with a grid-shaped conductive path composed of side conductive aluminum plates, center conductive aluminum plates, annular ribs and axial ribs, so that the surface current of the titanium cylinder of the cathode roller is uniformly conducted to the aluminum alloy shaft through the side conductive aluminum plates and the center conductive aluminum plates, and then the aluminum alloy shaft conducts the surface current out of the cathode roller, so that the uniformity of the surface current of the titanium cylinder of the cathode roller is ensured and the current density of the cathode roller is 9000A / m 2 The above working current density; the cathode roller of the application applies the center conductive aluminum plate and the side conductive aluminum plate which have the functions of structural support, current conduction and weight reduction, the structure is simple, the conductive material and the structural strength material are both aluminum alloy with relatively small relative density, the weight of the cathode roller of the same model can be reduced by more than 35% compared with a traditional cathode roller, so that various problems caused by turning, hoisting, overturning, transfer, transportation and driving of the large-diameter cathode roller in production and application are reduced, the bright surface quality of the copper foil produced by the large-diameter cathode roller is improved, and the surface density index of the copper foil produced by the large-diameter cathode roller is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 is a front view of the outer shape of the cathode roller.

[0038] Figure 2 is a left view of the outer shape of the cathode roller.

[0039] Figure 3 is a front view of the internal structure of the cathode roller.

[0040] Figure 4 is a front view of the internal structure of the cathode roller, and A-A is a sectional view.

[0041] Figure 5 is a front view of the internal structure of the cathode roller, and B-B is a sectional view.

[0042] Figure 6 is a partial E-E sectional view of the front view of the internal structure of the cathode roller, and A-A is a sectional view.

[0043] Figure 7 is a drawing of the center conductive aluminum plate.

[0044] Figure 8is a side conductive aluminum plate.

[0045] Figure: 1. Aluminum alloy shaft; 2. Titanium sleeve; 3. Titanium sheath; 4. Titanium plate; 5. Side conductive aluminum plate; 6. Titanium cover; 7. Titanium bolt weight rod; 8. Titanium cylinder; 9. Support cylinder; 10. Center conductive aluminum plate; 11. Annular rib; 12. Titanium ring; 13. Triangular reinforcing rib; 14. Axial rib; 15. Reinforcing rib; 16. Titanium bolt. DETAILED DESCRIPTION

[0046] This embodiment is a cathode roller with a diameter of 3600mm and a width of 1380mm, and the total current I is calculated according to formula (1) as follows:

[0047] I = 1 / 2·k·s·j (1)

[0048] k is the total current correction coefficient of the embodiment, and the value is 1; the outer circular area S of the titanium cylinder is 15599520mm 2 ; the current density j of titanium material is 0.009A / mm 2 . The data is brought into formula (1) to obtain the total current I of the cathode roller of the embodiment as 7000A.

[0049] The cathode roller comprises an aluminum alloy shaft 1, two titanium sleeves 2, two titanium sheaths 3, two titanium plates 4, two side conductive aluminum plates 5, a support cylinder 9 and a center conductive aluminum plate 10. Among them, the support cylinder 9 is sleeved on the aluminum alloy shaft 1; the two side conductive aluminum plates 5 are respectively sleeved on the aluminum alloy shaft 1; the outer circumferential surface of each side conductive aluminum plate is respectively matched with the inner circumferential surface of the two ends of the support cylinder 9. Two titanium sleeves 2 are respectively sleeved on the surface of the aluminum alloy shaft 1 and are respectively located on the outer side of the two side conductive aluminum plates 5, so that the end face of each side conductive aluminum plate is respectively matched with the end face of the side conductive aluminum plate at the location. Two titanium plates 4 are respectively sleeved on the outer circumferential surface of the titanium sleeve and located on one side of the outer end face of each side conductive aluminum plate 5; each titanium plate 4 is respectively fixedly connected with the side conductive aluminum plate 5 at the location through a titanium bolt weight rod 7. Two titanium sheaths 3 are respectively sleeved on the outer circumferential surface of the titanium sleeve 2, are respectively located on the outer side of the titanium plate 4, and the inner end face of the titanium sheath 3 is matched with the outer end face of the titanium plate 4 at the location. The outer end of the titanium sheath 3 is welded with the outer circular surface of the titanium sleeve, and the inner end of the titanium sheath and the titanium sleeve is respectively welded with the titanium plate.

[0050] The center conductive aluminum plate 10 is located in the support cylinder 9, is sleeved on the outer circumferential surface of the aluminum alloy shaft 1; and the center conductive aluminum plate 10 is at the axial symmetry plane of the support cylinder.

[0051] The aluminum alloy shaft 1, the two titanium sleeves 2, the two titanium sheaths 3, the two titanium plates 4, the two side conductive aluminum plates 5, the support cylinder 9 and the center conductive aluminum plate 10 are coaxial.

[0052] In this embodiment, the aluminum alloy shaft is a stepped shaft formed by rolling, the diameter of the small-diameter section at both ends is 420 mm, and the diameter of the large-diameter section in the middle is 450 mm; the end faces formed by the diameter difference at both ends of the stepped shaft are the positioning faces of the two side conductive aluminum plates 5.

[0053] To ensure the conductive performance of the cathode roller, the cross-sectional area of the small-diameter section of the aluminum alloy shaft is greater than the minimum cross-sectional area S1 required for the conductive performance of the aluminum alloy shaft; the minimum cross-sectional area S1 is determined by formula (2)

[0054] S1 = I / 2(K1·J) (2)

[0055] S1 is the minimum conductive cross-sectional area required for the conductive performance of the aluminum alloy shaft, and the unit is mm 2 ; I is the designed total current of the cathode roller, and the unit is A; K1 is a cross-sectional conductive correction coefficient, and the value is 1-1.5; J is the current density of the aluminum alloy, and the unit is A / mm 2 .

[0056] In this embodiment, the designed total current I of the cathode roller is 70000 A; the cross-sectional conductive correction coefficient K1 is 1; and the current density J of the aluminum alloy is 1.5 A / mm 2 . The minimum conductive cross-sectional area S1 of the aluminum alloy shaft of the cathode roller in this embodiment is 23333 mm 2 obtained by bringing the data into formula (2), which satisfies the condition that the cross-sectional area of the aluminum alloy shaft is greater than the minimum conductive cross-sectional area.

[0057] The titanium sleeve 2 is in a cylindrical shape, and the outer circumferential surface thereof is a stepped surface, wherein the outer diameter of the small-diameter section is 430 mm, and the outer diameter of the large-diameter section is 440 mm. The inner diameter of the titanium sleeve is the same as the diameter of the small-diameter section of the aluminum alloy shaft, and the titanium sleeve is tightly fitted with the aluminum alloy shaft after assembly.

[0058] The titanium sheath 3 is an annular plate, and the inner circumferential surface thereof is tightly fitted with the outer circumferential surface of the large-diameter section of the titanium sleeve 2. In this embodiment, the titanium sheath is a circular ring plate with a diameter of Φ440*Φ540 mm*10 mm.

[0059] The titanium plate 4 is an annular plate, and the inner circumferential surface thereof is welded with the outer circumferential surface of the large-diameter section of the titanium sleeve 2, and the outer circumferential surface thereof is welded with the inner circumferential surface of the titanium cylinder 8. Two circles of through holes for mounting titanium bolt counterweight rods are uniformly distributed on the titanium plate 4; the hole diameter of the through holes is 40 mm.

[0060] The titanium cover 6 is a ring-shaped plate with a diameter of Φ70 mm*6 mm, which is used to block the two circles of through holes on the titanium plate and is welded with the titanium plate.

[0061] The two titanium rings 12 are fixed at the outer edges of the outer end faces 4 of the two plates respectively, and the outer end faces of the titanium rings are 5 mm lower than the outer end face 5 of the titanium cylinder 8. Threaded holes are uniformly distributed on the titanium rings for mounting the insulating rings between the foil growth machine and the cathode roller. The inner circle of the titanium ring is welded with the outer end face of the titanium plate, and the outer circle of the titanium ring is welded with the surface of the shaft and the inner circumferential surface of the titanium cylinder 8. In this embodiment, the titanium ring is a circular ring with a diameter of Φ3580 mm x Φ3460 mm x 30 mm.

[0062] The side conductive aluminum plate 5 is a circular ring plate with a diameter of Φ3550 mm x Φ420 mm x 15 mm, and the inner end has a cylindrical boss concentric with the inner circle. The boss has a thickness of 20 mm, the outer circle diameter of the boss is Φ1200 mm, the inner circular surface is welded with the outer circular surface of the aluminum alloy shaft and has triangular reinforcing ribs therebetween, and the outer circular surface is welded with the inner wall of the support cylinder and has triangular reinforcing ribs therebetween.

[0063] To ensure the conductivity of the cathode roller, the area of the outer circumferential surface of the side conductive aluminum plate is greater than the minimum contact conductive area S ′ n , and the area of the inner circumferential surface of the side conductive aluminum plate is greater than the minimum contact conductive area S ″ n；

[0064] The minimum contact conductive area S between the side conductive aluminum plate and the support cylinder is determined by formula (3-1) ′ n :

[0065] S ′ n ＝ I / [(n+m)·K2·J] (3-1)

[0066] The minimum contact conductive area S between the side conductive aluminum plate and the aluminum alloy shaft is determined by formula (3-2) ″ n :

[0067] S ″ n ＝ I / [(n+m)·K2·J] (3-2)

[0068] In the formula:

[0069] S ′ n The minimum contact conductive area between the side conductive aluminum plate and the support cylinder, in mm 2 ;

[0070] S ″ n The minimum contact conductive area between the side conductive aluminum plate and the aluminum alloy shaft, in mm 2 ;

[0071] I——Cathode roller design total current, unit A;

[0072] n——The total number of side conductive aluminum plates contained by the cathode roller;

[0073] m——The total number of central conductive aluminum plates contained by the cathode roller;

[0074] K2——Contact conductive correction coefficient, the value is 0.5-1;

[0075] J——Current density of aluminum alloy, unit A / mm 2 .

[0076] In this embodiment, the design total current I of the cathode roller is 70000A; the total number of side conductive aluminum plates n contained by the cathode roller is 2; the total number of central conductive aluminum plates m contained by the cathode roller is 1; the contact conductive correction coefficient K2 is 0.6; the current density J of the aluminum alloy is 1.5A / mm 2 .

[0077] The data is brought into formula (3-1) to obtain the minimum contact conductive area S of the side conductive aluminum plate and the supporting cylinder ′ n is 25925mm 2 The area of the outer circumferential surface of the side conductive aluminum plate is greater than the minimum contact conductive area S ′ n .

[0078] The data is brought into formula (3-2) to obtain the minimum contact conductive area S of the side conductive aluminum plate and the aluminum alloy shaft ″ n is 25925mm 2 The area of the inner circumferential surface of the side conductive aluminum plate is greater than the minimum contact conductive area S ″ n .

[0079] The side conductive aluminum plate has 12 evenly distributed weight-reducing fan-shaped holes, the longer side of the arc length of the fan-shaped hole is close to the outer circular surface of the side conductive aluminum plate and is 400mm away, and the shorter side of the arc length of the fan-shaped hole is close to the outer circular surface of the boss of the side conductive aluminum plate and is 260mm away.

[0080] In order to ensure the conductive performance of the cathode roller, the number and position of the weight-reducing fan-shaped holes on the side conductive aluminum plate cannot make the cross-sectional area less than the minimum conductive cross-sectional area S n of the side conductive aluminum plate n The minimum conductive cross-sectional area S n of the side conductive aluminum plate is calculated as follows:

[0081] S n =I / [(n+m)·K1·J] (4)

[0082] The total current I of the embodiment cathode roller is 70000A; the total number n of the side conductive aluminum plates included in the embodiment cathode roller is 2; the total number m of the center conductive aluminum plates included in the embodiment cathode roller is 1; the cross-section conductive correction coefficient K1 is 1; the current density J of the aluminum alloy is 1.5A / mm 2 The data is brought into formula (4) to obtain the minimum conductive cross-sectional area S n of the side conductive aluminum plate of the embodiment cathode roller 2 The cross-sectional area of the side conductive aluminum plate is greater than its minimum conductive cross-sectional area S n .

[0083] The side conductive aluminum plate has two circles of threaded through holes matched with the titanium plate, wherein the threaded through holes of the outer circle are mounting holes of the titanium bolt weight rods, and the inner circle is a connecting hole for connecting the titanium plate and the side conductive aluminum plate.

[0084] In the embodiment: the titanium sleeve is sleeved on the support sleeve; the specification of the titanium sleeve is Φ3600mm×Φ3580mm×1380mm. The material of the titanium sleeve is pure titanium, the structure of the pure titanium is single-phase equiaxed α structure, and the average grain size is grade 11. The inner surface of the titanium sleeve is a threaded surface matched with the support sleeve, and the inner circumferential surface of the titanium sleeve is plated with silver 3-5μm. The straightness of the outer circumferential surface of the titanium sleeve and the roundness runout are ≤0.05mm, and the roughness Ra value is less than 0.2μm.

[0085] The support sleeve is sleeved on the aluminum alloy shaft. The specification of the support sleeve is Φ3580mm×Φ3550mm×1358mm. The outer circumferential surface of the support sleeve is a threaded surface, and the outer circumferential surface of the support sleeve is plated with silver 3-5μm.

[0086] The inner wall surface of the support sleeve of the cathode roller is uniformly distributed with a conductive path; the conductive path is composed of two side conductive aluminum plates 5, one center conductive aluminum plate 10, a plurality of annular ribs 11 and a plurality of axial ribs 14; each annular rib is arranged on the inner circumferential surface of the support sleeve along the axial direction, and the center distance between each two adjacent annular ribs is 600mm; each axial rib is arranged on the inner circumferential surface of the support sleeve along the circumferential direction, and the included angle between each two adjacent axial ribs is 15°; the grid of the conductive path is formed by the vertical intersection between the annular ribs and the axial ribs; the two ends of each axial rib are respectively fixedly connected with the side conductive aluminum plate 5 at the end.

[0087] To ensure the conductive performance of the cathode roller, the cross-sectional area of the support sleeve is greater than its minimum conductive cross-sectional area S2, and the minimum conductive cross-sectional area S2 of the aluminum alloy shaft is calculated according to formula (5) as follows:

[0088] S2=I / (K1·J) (5)

[0089] The total current I of the embodiment cathode roll is 70000A; the cross-section conductive correction coefficient K1 is 1; the current density J of the aluminum alloy is 1.5A / mm 2 The data is brought into formula (5) to obtain the minimum conductive cross-sectional area S2 of the support cylinder of the embodiment cathode roll, which is 46666mm 2 The cross-sectional area of the support cylinder is greater than the minimum conductive cross-sectional area S2.

[0090] The specification of the annular rib 11 is Φ3550mm×Φ3310mm×15mm, and the specification of the axial rib 14 is 300mm×100mm×15mm. In order to facilitate the uniform distribution of the surface current of the titanium cylinder of the cathode roll, the inner wall of the support cylinder of the cathode roll is uniformly distributed with a grid-shaped conductive path composed of side conductive aluminum plates, central conductive aluminum plates, annular ribs and axial ribs. The outer axial ribs respectively connect adjacent side conductive aluminum plates 5 and annular ribs 11, and the middle axial ribs respectively connect adjacent annular ribs 11 and central conductive aluminum plates 10, so that the surface current of the titanium cylinder of the cathode roll is uniformly conducted from the side conductive aluminum plates and the central conductive aluminum plates to the aluminum alloy shaft through the support cylinder. The distance between the annular rib and the adjacent side conductive aluminum plate or central conductive aluminum plate or annular rib is 300mm, and the angle between adjacent axial ribs is 15°.

[0091] The central conductive aluminum plate is a Φ3550mm×Φ450mm×20mm circular ring plate. The surfaces at both ends of the central conductive aluminum plate are respectively provided with a cylindrical boss to increase the conductive area of the central conductive aluminum plate; the axial height of the boss is 10mm, and the outer diameter of the boss is 1300mm. The central conductive aluminum plate is located in the support cylinder and at the axial symmetry plane of the central conductive aluminum plate. The distance between the central conductive aluminum plate and the side conductive aluminum plate located at both ends of the support cylinder is 600mm. The inner circumferential surface of the central conductive aluminum plate is fixedly connected with the circumferential surface of the aluminum alloy shaft; and the outer circumferential surface of the central conductive aluminum plate is fixedly connected with the inner surface of the support cylinder.

[0092] In order to ensure the conductive performance of the cathode roll, the area of the outer circumferential surface of the central conductive aluminum plate is greater than the minimum contact conductive area S ′ m ; and the area of the inner circumferential surface of the central conductive aluminum plate is greater than the minimum contact conductive area S ″ m；

[0093] The minimum contact conductive area S ′ m between the central conductive aluminum plate and the support cylinder is determined by formula (6-1):

[0094] S ′ m ＝ I / [(n+m)·K2·J] (6-1)

[0095] The minimum contact conductive area S of the center conductive aluminum plate and the supporting cylinder is determined by formula (6-1) ″ m :

[0096] S ″ m ＝ I / [(n+m)·K2·J] (6-2)

[0097] In the formula:

[0098] S ′ m The minimum contact conductive area of the center conductive aluminum plate and the supporting cylinder, unit: mm 2 ;

[0099] S ″ m The minimum contact conductive area of the center conductive aluminum plate and the aluminum alloy shaft, unit: mm 2 ;

[0100] I - The design total current of the cathode roller, unit: A;

[0101] n - The total number of side conductive aluminum plates contained by the cathode roller;

[0102] m - The total number of center conductive aluminum plates contained by the cathode roller;

[0103] K2 - Contact conductive correction coefficient, the value is 0.5-1;

[0104] J - The current density of the aluminum alloy, unit: A / mm 2 .

[0105] In this embodiment, the design total current I of the cathode roller is 70000A; the total number of side conductive aluminum plates n contained by the cathode roller of the embodiment is 2; the total number of center conductive aluminum plates m contained by the cathode roller of the embodiment is 1; the contact conductive correction coefficient K2 is 0.6; the current density J of the aluminum alloy is 1.5A / mm 2 . The data is brought into formula (6-1) to obtain the minimum contact conductive area S of the center conductive aluminum plate and the supporting cylinder ′ m 25925mm 2 , the area of the outer circumferential surface of the center conductive aluminum plate is greater than the minimum contact conductive area S ′ m .

[0106] The data is brought into formula (6-2) to obtain the minimum contact conductive area S of the center conductive aluminum plate and the aluminum alloy shaft ″ m 25925mm 2The inner circumferential surface of the center conductive aluminum plate has an area greater than the minimum contact conductive area S ″ m.

[0107] The center conductive aluminum plate has 12 evenly distributed weight-reducing fan-shaped holes, the longer arc length side of the fan-shaped hole is close to the outer circumferential surface of the side center conductive aluminum plate and is 400 mm away, and the shorter arc length side of the fan-shaped hole is close to the outer circumferential surface of the side center conductive aluminum plate and is 260 mm away.

[0108] To ensure the conductive performance of the cathode roll, the number and position of the weight-reducing fan-shaped holes on the center conductive aluminum plate cannot make the cross-sectional area less than the minimum conductive cross-sectional area S m of the center conductive aluminum plate m Calculated by formula (7) as follows:

[0109] S m = I / [(n+m)·K1·J] (7)

[0110] The total current I of the cathode roll in the embodiment is 70000 A; the total number n of the side conductive aluminum plates included in the cathode roll in the embodiment is 2; the total number m of the center conductive aluminum plates included in the cathode roll in the embodiment is 1; the cross-sectional conductive correction coefficient K1 is 1; and the current density J of the aluminum alloy is 1.5 A / mm 2 . The minimum conductive cross-sectional area S m of the center conductive aluminum plate of the cathode roll in the embodiment is 15556 mm 2 , which is greater than the minimum conductive cross-sectional area S m of the center conductive aluminum plate.

[0111] The aluminum alloy shaft, the support cylinder, the side conductive aluminum plate, the center conductive aluminum plate, the hoop rib and the axial rib form the conductive path of the cathode roll. The electrical conductivity of each aluminum alloy material forming the conductive path is 40% IACS, and the electrical resistivity is 0.04 Ω·mm 2 / m when the temperature is 20℃-70℃.

Claims

1. A large-diameter cathode roll for electrolytic copper foil production, characterized by, The utility model relates to a kind of cathode roller, including aluminium alloy shaft (1), two titanium sleeves (2), two titanium sheaths (3), two titanium plates (4), two side conductive aluminium plates (5), support cylinder (9) and central conductive aluminium plate (10) made of aluminium alloy;Wherein, the support cylinder (9) is sleeved on the aluminium alloy shaft (1);Two side conductive aluminium plates (5) are respectively sleeved on aluminium alloy shaft (1);Make the outer circumferential surface of each side conductive aluminium plate respectively with the inner circumferential surface of the both ends of support cylinder (9) adhere;Two titanium sleeves (2) are respectively sleeved on the surface of the aluminium alloy shaft (1), and are respectively located at the outside of the two side conductive aluminium plates (5), make the end surface of each side conductive aluminium plate respectively with the end surface of side conductive aluminium plate at the location adhere;Two titanium plates (4) are respectively sleeved on the outer circumferential surface of the titanium sleeve and are located at the outer end surface side of each side conductive aluminium plate (5);Each titanium plate (4) is respectively fixed with side conductive aluminium plate (5) at the location by titanium bolt counterweight bar (7);Two titanium sheaths (3) are respectively sleeved on the outer circumferential surface of titanium sleeve (2), and are located at the outside of titanium plate (4), and make the inner end surface of the titanium sheath (3) with the outer end surface of titanium plate (4) at the location adhere;Titanium sheath (3) outer end is welded with titanium sleeve outer circumferential surface, and titanium sheath and titanium sleeve inner end are respectively welded with titanium plate; The central conductive aluminium plate (10) is located in the support cylinder (9), and is sleeved on the outer circumferential surface of the aluminium alloy shaft (1);The central conductive aluminium plate is at the axial symmetry plane of the support cylinder.

2. The large-diameter cathode roll for producing electrolytic copper foil according to claim 1, characterized by The inner wall surface of the support cylinder of the cathode roller is uniformly distributed with conductive path;The conductive path is composed of two side conductive aluminium plates (5), a central conductive aluminium plate (10), a plurality of annular ribs (11) and a plurality of axial ribs (14);Each annular rib is arranged on the inner circumferential surface of the support cylinder in the axial direction, and the center distance between each two adjacent annular ribs is 600 mm;Each axial rib is arranged on the inner circumferential surface of the support cylinder in the circumferential direction, and the included angle between each two adjacent axial ribs is 15°;The grid of the conductive path is formed by the vertical intersection between the annular rib and the axial rib;The both ends of each axial rib are respectively fixed with the side conductive aluminium plate (5) at the end; The aluminum alloy material constituting the conductive path has an electrical conductivity > 40% IACS and an electrical resistivity < 0.04 Ω mm at a temperature of 20°C to 70°C 2 / m.

3. The large-diameter cathode roll for producing electrolytic copper foil according to claim 1, characterized by The both ends of the central conductive aluminium plate are respectively provided with cylindrical bosses to increase the conductive area of the central conductive aluminium plate;The axial height of the boss is 10 mm, and the outer diameter of the boss is 1300 mm;The central conductive aluminium plate is located in the support cylinder and at the axial symmetry plane of the central conductive aluminium plate;The distance between the central conductive aluminium plate and the side conductive aluminium plate located at both ends of the support cylinder is 600 mm;The inner circumferential surface of the central conductive aluminium plate is fixed with the circumferential surface of the aluminium alloy shaft;The outer circumferential surface of the central conductive aluminium plate is fixed with the inner surface of the support cylinder.

4. The large-diameter cathode roll for producing electrolytic copper foil according to claim 1, characterized by The cross-sectional area of the small-diameter section of the aluminium alloy shaft is greater than the minimum cross-sectional area S1 required for the conduction of the aluminium alloy shaft, and the minimum cross-sectional area S1 is determined by formula (2) S1=I / 2 (K1·J) (2) In the formula: S1 is the minimum conductive cross-sectional area required for the aluminum alloy shaft to conduct electricity, with units of mm 2 ; I is the design total current of the cathode roller, with units of A; K1 is the cross-sectional conductive correction coefficient, with a value of 1-1.5; J is the current density of the aluminum alloy, with units of A / mm 2 .

5. The large-diameter cathode roll for electrolytic copper foil production as recited in claim 4, characterized by, The design total current I is calculated by formula (1) I=1 / 2·k·s·j (1) In the formula, I is the designed total current of the cathode roller, in A; k is the correction coefficient of the designed total current of the cathode roller, and is 1-2; and s is the outer circle area of the designed cathode roller titanium cylinder, in mm 2 ; j is the current density of the titanium cylinder material in A / mm 2 .

6. The large-diameter cathode roll for producing electrolytic copper foil according to claim 1, characterized by The minimum contact conductive area S of the side conductive aluminum plate and the support cylinder is determined by formula (3-1) ′ n : S ′ n = I / [(n + m) - K2- J] (3-1) The minimum contact conductive area S of the side conductive aluminum plate and the aluminum alloy shaft is determined by formula (3-2) ″ n : S ″ n = I / [(n + m) - K2- J] (3-2) wherein: S ′ n is the minimum contact conductive area of the side conductive aluminum plate with the support cylinder, in mm 2 ; S ″ n is the minimum contact conductive area of the side conductive aluminum plate with the aluminum alloy shaft, in mm 2 ; I is the designed total current of the cathode roller, in A; n is the total number of side conductive aluminum plates contained by the cathode roller; m is the total number of central conductive aluminum plates contained in the cathode roller; K2 is a contact conductive correction coefficient, and the value is 0.5-1; J is the current density of the aluminum alloy, unit A / mm 2 .

7. The large-diameter cathode roll for producing electrolytic copper foil according to claim 1, characterized by The minimum conductive cross-sectional area S of the side conductive aluminum plate included in the cathode roller is determined by Equation (4) n : S n = I / [(n + m) - K1 - J] (4) In the formula: S n is the minimum conductive cross-sectional area of the side conductive aluminum plate, unit: mm 2 ; I is the design total current of the cathode roller, unit: A; n is the total number of side conductive aluminum plates contained by the cathode roller; m is the total number of center conductive aluminum plates contained by the cathode roller; K1 is the cross-sectional conductive correction coefficient, the cross-sectional conductive value is 1~1.5; J is the current density of aluminum alloy, unit: A / mm 2 .

8. The large-diameter cathode roll for producing electrolytic copper foil according to claim 1, characterized by The minimum conductive cross-sectional area S2 of the support cylinder included in the cathode roller is determined by formula (5) S2 = I / (K1 - J) (5) wherein: S2 is the minimum conductive cross-sectional area required for the support cylinder to conduct electricity, in mm 2 ; I is the designed total current of the cathode roller, in A; K1 is the cross-section conductive correction coefficient, with a value of 1-1.5; J is the current density of the aluminum alloy, in A / mm 2 .

9. The large-diameter cathode roll for producing electrolytic copper foil according to claim 1, characterized by The minimum contact conductive area S of the center conductive aluminum plate and the support cylinder is determined by formula (6-1) ′ m : S ′ m = I / [(n + m) - K2- J] (6-1) The minimum contact conductive area S of the center conductive aluminum plate and the aluminum alloy shaft is determined by formula (6-2) ″ m : S ″ m = I / [(n + m) - K2- J] (6-2) wherein: S ′ m is the minimum contact conductive area between the central conductive aluminum plate and the support cylinder, in mm 2 ; S ″ m is the minimum contact conductive area between the central conductive aluminum plate and the aluminum alloy shaft, in mm 2 ; I is the designed total current of the cathode roller, in A; n is the total number of side conductive aluminum plates contained by the cathode roller; m is the total number of central conductive aluminum plates contained in the cathode roller; K2 is a contact conductive correction coefficient, and the value is 0.5-1; J is the current density of the aluminum alloy, unit A / mm 2 .

10. The large-diameter cathode roll for producing electrolytic copper foil according to claim 1, characterized in that, The minimum conductive cross-sectional area S of the center conductive aluminum plate of the cathode roll is determined by formula (7) m : S m = I / [(n + m) - K1 - J] (7) In the formula: S m is the minimum conductive cross-sectional area of the center conductive aluminum plate, unit: mm 2 ; I is the design total current of the cathode roller, unit: A; n is the total number of side conductive aluminum plates contained by the cathode roller; m is the total number of center conductive aluminum plates contained by the cathode roller; K1 is the cross-sectional conductive correction coefficient, the cross-sectional conductive value is 1-1.5; J is the current density of aluminum alloy, unit: A / mm 2 .

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