Lightweight large-diameter cathode roller for electrolytic copper foil production

Abstract

According to the light-weight large-diameter cathode roller for electrolytic copper foil production, a titanium barrel and a supporting barrel are connected through threads, and silver plating treatment is conducted on the surfaces of the threads, so that the contact conductive area of the titanium barrel and the supporting barrel is increased, energy consumption and local hot spots of contact resistance are reduced, and uniform distribution of current on the surface of the titanium barrel is facilitated; latticed conductive paths composed of the side conductive aluminum plates, the center conductive aluminum plate, the annular ribs and the axial ribs are evenly distributed on the inner wall of the supporting cylinder, current on the surface of the cathode roller titanium cylinder is conducted to the aluminum alloy shaft through the supporting cylinder and then conducted out of the cathode roller through the aluminum alloy shaft, and the current uniformity of the surface of the cathode roller titanium cylinder and the working current density of 9000 A / m < 2 > or above are guaranteed. According to the large-diameter cathode roller, aluminum alloy is adopted as a conductive material and a structural strength material, the structure is simple, the weight is reduced by 35% or above, the problems caused by turning, hoisting, overturning, transferring, transporting and driving in the production manufacturing and using process are reduced, the smooth surface quality of copper foil produced by the large-diameter cathode roller is improved, and the surface density index is guaranteed.

Description

Technical Field

[0001] The invention relates to the field of electrolytic copper foil equipment manufacturing, in particular to a cathode roller with a diameter greater than 3000 mm for producing electrolytic copper foil. Background Art

[0002] As one of the basic materials of the electronics industry, electrolytic copper foil is mainly used to manufacture printed circuit boards (PCBs), copper clad laminates (CCLs), lithium-ion batteries, energy storage batteries, etc. Electrolytic copper foil is produced by electrolysis. Under the action of an external DC electric field, copper ions in the electrolyte in the anode tank of the foil machine are continuously deposited onto the surface of the cathode roller rotating at a constant speed. When the deposit reaches a certain thickness, the electrolytic copper foil is continuously produced after peeling, surface treatment, and winding.

[0003] The cathode roller, as the carrier for the production of electrolytic copper foil, is a rotating structure with shafts at both ends and a cylinder in the middle. It is mainly composed of steel materials for internal support strength, copper materials for conductivity, and titanium materials for external corrosion protection and foil production. The larger the diameter and the longer the width, the more area involved in the electrolytic foil production, and the higher the production efficiency. As the core equipment for the production of electrolytic copper foil, the specifications, dimensions, conductivity, and grain size of the cathode roller all involve the production efficiency, economic benefits, and product quality of the copper foil, and have always been the core and focus of copper foil companies. After more than 30 years of development, the diameter of the cathode roller has increased from 1500mm to the current 3600mm, and the efficiency of the cathode roller in producing foil has been greatly improved. However, as the diameter of the cathode roller increases, the weight of the cathode roller doubles, resulting in a variety of problems in the manufacturing and use of the cathode roller: the difficulty of lifting, turning, transferring, and transporting the cathode roller between different processes during manufacturing increases; the cathode roller surface cannot be processed at a high speed during turning and polishing, which affects the surface processing quality and processing efficiency, and reduces the glossy quality of the copper foil produced; the cathode roller needs to be driven by a higher power motor when electrolyzing raw foil, causing the cathode roller drive system of the raw foil machine to occupy too much space, affecting the uniform rotation of the cathode roller, and causing the key indicator of the copper foil produced to exceed the surface density; more stringent requirements are placed on the cathode roller support structure, foundation, and storage floor load-bearing capacity of the raw foil machine, increasing unnecessary copper foil production costs. The above-mentioned problem of a significant increase in weight caused by the increase in the diameter of the cathode roller has brought a lot of trouble to electrolytic copper foil equipment manufacturers and electrolytic copper foil manufacturers.

[0004] The invention patent with the announcement number CN 101928978 B discloses a rotating cathode roller for electrolysis, including an outer cylinder and an inner cylinder, the inner cylinder is made of aluminum alloy, and a mesh conductive plate is distributed on the inner surface of the inner cylinder, so that the inner cylinder does not overheat under large current flow, suppresses the generation of hot spots, and improves the contact positive stress, overall rigidity and heat dissipation performance of the rotating cathode roller for electrolysis. This patent mainly utilizes the high thermal expansion rate and good conductivity of aluminum alloy to increase the positive pressure of the joint of the inner and outer cylinders during operation and suppress the generation of hot spots. It is not used to solve the problem of lightweighting of large-diameter cathode rollers, nor does it solve the problem that the overall structure and conductivity of the aluminum alloy cathode roller meet the requirements of raw foil. Summary of the invention

[0005] In order to solve the problem that the cathode roller becomes heavier as its diameter becomes larger, which affects the surface processing quality and processing efficiency during the lifting, turning, transfer and transportation of the cathode roller in the manufacturing and electrolytic raw foil, the present invention proposes a lightweight large-diameter cathode roller for electrolytic copper foil production.

[0006] The present invention includes an aluminum alloy shaft, two titanium sleeves, two titanium sleeves, two titanium plates, two side conductive aluminum plates, a support tube made of aluminum alloy, and a central conductive aluminum plate. The support tube is sleeved on the aluminum alloy shaft; the two side conductive aluminum plates are sleeved on the aluminum alloy shaft respectively; the outer circumferential surface of each side conductive aluminum plate is respectively fitted with the inner circumferential surface of the two ends of the support tube. The two titanium sleeves are respectively sleeved on the surface of the aluminum alloy shaft and are respectively located on the outside of the two side conductive aluminum plates, so that the end face of each side conductive aluminum plate is respectively fitted with the end face of the side conductive aluminum plate at the position. The two titanium plates are respectively sleeved on the outer circumferential surface of the titanium sleeve and are located on one side of the outer end face of each side conductive aluminum plate; each titanium plate is respectively fixedly connected to the side conductive aluminum plate at the position by a titanium bolt counterweight rod. The two titanium sleeves are respectively sleeved on the outer circumferential surface of the titanium sleeve and are respectively located on the outside of the titanium plate, and the inner end face of the titanium sleeve is fitted with the outer end face of the titanium plate at the position. The outer end of the titanium sheath is welded to the outer cylindrical surface of the titanium sleeve, and the inner ends of the titanium sheath and the titanium sleeve are respectively welded to the titanium plate.

[0007] The central conductive aluminum plate is located in the support tube and is sleeved on the outer circumferential surface of the aluminum alloy shaft 1; the central conductive aluminum plate is located at the axial symmetric plane of the support tube.

[0008] The inner wall surface of the support tube is uniformly provided with conductive paths; the conductive paths are composed of two side conductive aluminum plates, a central conductive aluminum plate, a plurality of annular ribs and a plurality of axial ribs; the annular ribs are arranged axially on the inner circumferential surface of the support tube, and the center distance between each two adjacent annular ribs is 600mm; the axial ribs are arranged circumferentially on the inner circumferential surface of the support tube, and the angle between each adjacent axial rib is 15°; a grid of conductive paths is formed by the perpendicular intersection between the annular ribs and the axial ribs; the two ends of each axial rib are respectively fixedly connected to the side conductive aluminum plate 5 at the end;

[0009] The aluminum alloy materials constituting the conductive path have a conductivity greater than 40% IACS and a resistivity less than 0.04 Ω·mm at a temperature of 20°C to 70°C. 2 / m.

[0010] The central conductive aluminum plate has cylindrical bosses on both ends to increase the conductive area of ​​the central conductive aluminum plate; the axial height of the boss is 10 mm and the outer diameter of the boss is 1300 mm; the central conductive aluminum plate is located in the support tube and is located at the axial symmetry plane of the central conductive aluminum plate; the distance between the central conductive aluminum plate and the side conductive aluminum plates located at both ends of the support tube is 600 mm. 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 tube.

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

[0014] The designed total current I is calculated by formula (1):

[0015] I=1 / 2·k·s·j (1)

[0016] Where: I is the total design current of the cathode roller, unit A; k is the total design current correction coefficient of the cathode roller, the value is 1-2; s is the outer circumference area of ​​the designed cathode roller titanium cylinder, unit mm 2 ; j is the current density of the titanium tube material, unit A / mm 2 .

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

[0018] S ′ n ＝ I / [(n+m)·K2·J] (3-1)

[0019] The minimum contact conductive area S between 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] Where: S ′ n It is the minimum contact conductive area between the side conductive aluminum plate and the support tube, unit: mm 2 ; S ″ n It is the minimum contact conductive area between the side conductive aluminum plate and the aluminum alloy shaft, unit: mm 2 ; I is the total design 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 central conductive aluminum plates included in the cathode roller; K2 is the contact conductivity correction coefficient, which is 0.5 to 1; J is the current density of the aluminum alloy, in A / mm 2 .

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

[0023] S n ＝ I / [(n+m)·K1·J] (4)

[0024] Where: S n It is the minimum conductive cross-sectional area of ​​the side conductive aluminum plate, in mm 2 ; I is the total design 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 central conductive aluminum plates included in the cathode roller; K1 is the cross-sectional conductivity correction coefficient, and the cross-sectional conductivity value is 1 to 1.5; J is the current density of the aluminum alloy, in A / mm 2 .

[0025] The minimum conductive cross-sectional area S2 of the support cylinder included in the cathode roller is determined by formula (5):

[0026] S2=I / (K1·J) (5)

[0027] Where: S2 is the minimum conductive cross-sectional area required for the support tube to conduct electricity, unit: mm 2 ; I is the total design current of the cathode roller, unit A; K1 is the cross-sectional conductivity correction factor, the value is 1 to 1.5; J is the current density of the aluminum alloy, unit A / mm 2 .

[0028] The minimum contact conductive area S between the central conductive aluminum plate and the support tube is determined by formula (6-1): ′ m :

[0029] S ′ m ＝ I / [(n+m)·K2·J] (6-1)

[0030] The minimum contact conductive area S between the central conductive aluminum plate and the aluminum alloy shaft is determined by formula (6-2): ″ m :

[0031] S ″ m ＝ I / [(n+m)·K2·J] (6-2)

[0032] Where: S ′ m It is the minimum contact conductive area between the central conductive aluminum plate and the support tube, in mm 2 ; S ″ m It is the minimum contact conductive area between the central conductive aluminum plate and the aluminum alloy shaft, in mm 2 ; I is the total design 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 central conductive aluminum plates included in the cathode roller; K2 is the contact conductivity correction coefficient, which is 0.5 to 1; J is the current density of the aluminum alloy, in A / mm 2 .

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

[0034] S m ＝ I / [(n+m)·K1·J] (7)

[0035] Where: S m It is the minimum conductive cross-sectional area of ​​the central conductive aluminum plate, in mm 2; I is the total design 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 central conductive aluminum plates included in the cathode roller; K1 is the cross-sectional conductivity correction coefficient, and the cross-sectional conductivity value is 1 to 1.5; J is the current density of the aluminum alloy, in A / mm 2 .

[0036] The present invention proposes a lightweight large-diameter cathode roller for electrolytic copper foil production, wherein the titanium cylinder and the support cylinder are assembled by threaded connection, and the thread surface is silver-plated, thereby increasing the contact conductive area between the two, reducing the energy consumption and local hot spots of the cathode roller contact resistance, and facilitating the uniform distribution of current on the surface of the titanium cylinder of the cathode roller; the inner wall of the support cylinder of the cathode roller is evenly distributed with a grid-like conductive path composed of side conductive aluminum plates, central conductive aluminum plates, annular ribs, and axial ribs, so that the current on the surface of the titanium cylinder of the cathode roller is evenly conducted through the support cylinder from the side conductive aluminum plates and the central conductive aluminum plates to the aluminum alloy shaft, and then conducted out of the cathode roller from the aluminum alloy shaft, thereby ensuring the current uniformity on the surface of the titanium cylinder of the cathode roller and 9000A / m 2 The cathode roller of the present invention uses a central conductive aluminum plate and a side conductive aluminum plate with structural support, current conduction and weight reduction functions. The structure is simple, and the conductive material and structural strength material are both aluminum alloys with relatively low density. Compared with the traditional cathode roller of the same model, the weight can be reduced by more than 35%, which is beneficial to reduce the various problems such as turning, lifting, turning, transferring, transportation and driving caused by large-diameter cathode rollers in production and application, improves the smooth surface quality of copper foil produced by large-diameter cathode rollers, and ensures the surface density index of copper foil produced by large-diameter cathode rollers. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is the front view of the cathode roller.

[0038] Figure 2 This is the left side view of the cathode roller appearance.

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

[0040] Figure 4 It is the main view and AA section view of the internal structure of the cathode roller.

[0041] Figure 5 It is the main view BB sectional view of the internal structure of the cathode roller.

[0042] Figure 6 It is a partial EE sectional view of the main view AA sectional view of the internal structure of the cathode roller.

[0043] Figure 7 It is a diagram of the central conductive aluminum plate.

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

[0045] In the figure: 1. Aluminum alloy shaft; 2. Titanium sleeve; 3. Titanium sleeve; 4. Titanium plate; 5. Side conductive aluminum plate; 6. Titanium cover; 7. Titanium bolt counterweight rod; 8. Titanium cylinder; 9. Support cylinder; 10. Center conductive aluminum plate; 11. Annular ribs; 12. Titanium ring; 13. Triangular reinforcement ribs; 14. Axial ribs; 15. Reinforcement ribs; 16. Titanium bolts. DETAILED DESCRIPTION

[0046] This embodiment is a cathode roller with a diameter of 3600 mm and a width of 1380 mm. The designed total current I is calculated by formula (1) as follows:

[0047] I=1 / 2·k·s·j (1)

[0048] k is the total current correction coefficient designed in the embodiment, and its value is 1; according to the diameter and width of the cathode roller in the embodiment, the outer circle area S of the titanium cylinder is calculated to be 15599520 mm 2 ; The current density j of titanium material is 0.009A / mm 2 Substituting the data into formula (1), the design total current I of the cathode roller of the embodiment is 7000A.

[0049] The cathode roller includes 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 tube 9 and a central conductive aluminum plate 10. The support tube 9 is mounted on the aluminum alloy shaft 1; the two side conductive aluminum plates 5 are mounted on the aluminum alloy shaft 1 respectively; the outer circumferential surface of each side conductive aluminum plate is respectively fitted with the inner circumferential surface of the two ends of the support tube 9. The two titanium sleeves 2 are respectively mounted on the surface of the aluminum alloy shaft 1 and are respectively located on the outside of the two side conductive aluminum plates 5, so that the end face of each side conductive aluminum plate is respectively fitted with the end face of the side conductive aluminum plate at the position. The two titanium plates 4 are respectively mounted on the outer circumferential surface of the titanium sleeve and are located on one side of the outer end face of each side conductive aluminum plate 5; each titanium plate 4 is respectively fixedly connected to the side conductive aluminum plate 5 at the position through a titanium bolt counterweight bar 7. Two titanium sheaths 3 are respectively sleeved on the outer circumferential surface of the titanium sheath 2, and are respectively located outside the titanium plate 4, and the inner end surface of the titanium sheath 3 is in contact with the outer end surface of the titanium plate 4. The outer end of the titanium sheath 3 is welded to the outer circumferential surface of the titanium sheath, and the inner end of the titanium sheath and the titanium sheath are respectively welded to the titanium plate.

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

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

[0052] In this embodiment, the aluminum alloy shaft is a rolled stepped shaft, the diameter of the small diameter sections 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 surfaces of the two side conductive aluminum plates 5.

[0053] To ensure the conductivity 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 aluminum alloy shaft to be conductive; the minimum cross-sectional area S1 is determined by (2).

[0054] S1=I / 2(K1·J) (2)

[0055] S1 is the minimum conductive cross-sectional area required for the aluminum alloy shaft to conduct electricity, in mm 2 ; I is the total design current of the cathode roller, unit A; K1 is the cross-sectional conductivity correction factor, the value is 1 to 1.5; J is the current density of the aluminum alloy, unit A / mm 2 .

[0056] In this embodiment, the total design current I of the cathode roller is 70000A; the cross-sectional conductivity correction coefficient K1 is 1; the current density J of the aluminum alloy is 1.5A / mm 2 Substituting the data into formula (2), we can obtain the minimum conductive cross-sectional area S1 of the aluminum alloy shaft of the cathode roller of the embodiment as 23333 mm 2 , satisfying that the cross-sectional area of ​​the aluminum alloy shaft is larger than its minimum conductive cross-sectional area.

[0057] The titanium sleeve 2 is cylindrical, and its outer circumferential surface is a stepped surface, wherein the outer diameter of the small outer diameter section is 430mm, and the outer diameter of the large outer diameter section is 440mm. 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 two are tightly matched after assembly.

[0058] The titanium sheath 3 is an annular plate, and its inner circumferential surface is tightly matched with the outer circumferential surface of the large outer diameter section of the titanium sheath 2. In this embodiment, the titanium sheath is a circular plate of Φ440×Φ540mm×10mm.

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

[0060] The titanium cover 6 is a Φ70mm×6mm annular plate, which is used to seal the two circles of through holes on the titanium plate and is welded to the titanium plate.

[0061] The two titanium rings 12 are respectively fixed at the outer edges of the two plate outer end faces 4, and the outer end faces of each titanium ring are 5 mm lower than the outer end face of the titanium cylinder 8. Threaded holes are evenly distributed on each titanium ring for installing the insulating ring between the foil machine and the cathode roller. The inner circle of the titanium ring is welded to the outer end face of the titanium plate, and the outer circle of the titanium ring is welded to the shaft surface and the inner circumferential surface of the titanium cylinder 8. In this embodiment, the titanium ring is a circular ring of Φ3580mm×Φ3460mm×30mm.

[0062] The side conductive aluminum plate 5 is a Φ3550mm×Φ420mm×15mm circular plate, and its inner end has a cylindrical boss concentric with the inner circle. The boss thickness is 20mm, the outer diameter of the boss is Φ1200mm, the inner circle surface is welded to the outer circle surface of the aluminum alloy shaft with triangular reinforcing ribs in between, and the outer circle surface is welded to the inner wall of the support tube with triangular reinforcing ribs in between.

[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 ; The area of ​​the inner circumferential surface of the side conductive aluminum plate> the minimum contact conductive area S ″ n；

[0064] The minimum contact conductive area S between the side conductive aluminum plate and the support tube 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] Where:

[0069] S ′ n ——Minimum contact conductive area between the side conductive aluminum plate and the support tube, unit: mm 2 ;

[0070] S ″ n ——Minimum contact conductive area between the side conductive aluminum plate and the aluminum alloy shaft, unit: mm 2 ;

[0071] I——the total design current of the cathode roller, in A;

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

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

[0074] K2——Contact conductivity correction coefficient, the value is 0.5~1;

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

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

[0077] Substitute the data into formula (3-1) to obtain the minimum contact conductive area S between the side conductive aluminum plate and the support tube ′ n 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] Substitute the data into formula (3-2) to obtain the minimum contact conductive area S between the side conductive aluminum plate and the aluminum alloy shaft ″ n 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 is provided with 12 evenly distributed weight-reducing fan-shaped holes, the side with a longer arc length of the fan-shaped hole is close to the outer circumferential surface of the side conductive aluminum plate and is 400 mm away, and the side with a shorter arc length of the fan-shaped hole is close to the outer circumferential surface of the boss of the side conductive aluminum plate and is 260 mm away.

[0080] In order to ensure the conductivity of the cathode roller, the number and position of the weight-reducing fan-shaped holes on the side conductive aluminum plate cannot make their cross-sectional area smaller than its minimum conductive cross-sectional area S n , the minimum conductive cross-sectional area S of the side conductive aluminum plate n The calculation is as follows according to formula (4):

[0081] S n =I / [(n+m)·K1·J] (4)

[0082] The total design current I of the cathode roller of the embodiment is 70000A; the total number n of the side conductive aluminum plates included in the cathode roller of the embodiment is 2; the total number m of the center conductive aluminum plates included in the cathode roller of the embodiment is 1; the cross-sectional conductivity correction coefficient K1 is 1; the current density J of the aluminum alloy is 1.5A / mm 2 Substituting the data into formula (4) to obtain the minimum conductive cross-sectional area S of the side conductive aluminum plate of the cathode roller of the embodiment: n 15556mm 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 is provided with two circles of threaded through holes matching with the titanium plate, wherein the threaded through holes in the outer circle are mounting holes for the titanium bolt counterweight rods, and the inner circle are connection holes for connecting the titanium plate and the side conductive aluminum plate.

[0084] In this embodiment: the titanium cylinder sleeve is mounted on the support cylinder; the specifications of the titanium cylinder sleeve are Φ3600mm×Φ3580mm×1380mm. The titanium cylinder material is pure titanium, the structure of the pure titanium is a single-phase equiaxial α structure, and the average grain size grade is 11. The inner surface of the titanium cylinder has a threaded surface that matches the support cylinder, and the inner circumferential surface of the titanium cylinder is silver-plated for 3 to 5μm. The outer circumference straightness and circular runout of the titanium cylinder are ≤0.05mm, and the roughness Ra value is less than 0.2μm.

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

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

[0087] In order to ensure the conductivity of the cathode roller, the cross-sectional area of ​​the support cylinder is larger than its minimum conductive cross-sectional area S2. 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 design current I of the cathode roller in the embodiment is 70000A; the cross-sectional conductivity correction coefficient K1 is 1; the current density J of the aluminum alloy is 1.5A / mm 2 Substituting the data into formula (5), we can obtain the minimum conductive cross-sectional area S2 of the support cylinder of the cathode roller in the embodiment as 46666 mm 2 , satisfying that the cross-sectional area of ​​the support tube is greater than its minimum conductive cross-sectional area S2.

[0090] The specifications of the annular ribs 11 are Φ3550mm×Φ3310mm×15mm, and the specifications of the axial ribs 14 are 300mm×100mm×15mm. In order to facilitate the uniform distribution of current on the surface of the titanium cylinder of the cathode roller, the inner wall of the support cylinder of the cathode roller is evenly distributed with a grid-like conductive path composed of side conductive aluminum plates, center conductive aluminum plates, annular ribs, and axial ribs. The outer axial ribs connect the adjacent side conductive aluminum plates 5 and annular ribs 11 respectively, and the middle axial ribs connect the adjacent annular ribs 11 and the center conductive aluminum plate 10 respectively, so that the current on the surface of the cathode roller titanium cylinder is evenly conducted from the side conductive aluminum plates and the center conductive aluminum plates to the aluminum alloy shaft through the support cylinder. The distance between the annular ribs and the adjacent side conductive aluminum plates or center conductive aluminum plates or annular ribs 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 of both ends of the central conductive aluminum plate are provided with cylindrical bosses 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 tube and is located at the axial symmetry plane of the central conductive aluminum plate; the distance between the central conductive aluminum plate and the side conductive aluminum plates located at both ends of the support tube 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 tube.

[0092] To ensure the conductivity of the cathode roller, the area of ​​the outer circumferential surface of the central conductive aluminum plate is greater than the minimum contact conductive area S ′ m ; The area of ​​the inner circumferential surface of the central conductive aluminum plate> the minimum contact conductive area S ″ m；

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

[0094] S ′ m ＝ I / [(n+m)·K2·J] (6-1)

[0095] The minimum contact conductive area S between the central conductive aluminum plate and the aluminum alloy shaft is determined by formula (6-2): ″ m :

[0096] S ″ m ＝ I / [(n+m)·K2·J] (6-2)

[0097] Where:

[0098] S ′ m ——Minimum contact conductive area between the central conductive aluminum plate and the support tube, unit: mm 2 ;

[0099] S ″ m ——Minimum contact conductive area between the central conductive aluminum plate and the aluminum alloy shaft, unit: mm 2 ;

[0100] I——the total design current of the cathode roller, in A;

[0101] n——The total number of side conductive aluminum plates included in the cathode roller;

[0102] m——The total number of central conductive aluminum plates contained in the cathode roller;

[0103] K2——Contact conductivity correction coefficient, the value is 0.5~1;

[0104] J——Current density of aluminum alloy, unit A / mm 2 .

[0105] In this embodiment, the total design current I of the cathode roller is 70000A; the total number n of the side conductive aluminum plates included in the cathode roller of the embodiment is 2; the total number m of the center conductive aluminum plates included in the cathode roller of the embodiment is 1; the contact conductivity correction coefficient K2 is 0.6; the current density J of the aluminum alloy is 1.5A / mm 2 Substitute the data into formula (6-1) to obtain the minimum contact conductive area S between the central conductive aluminum plate and the support tube. ′ m 25925mm 2 , the outer circumferential surface area of ​​the central conductive aluminum plate is larger than its minimum contact conductive area S ′ m .

[0106] Substitute the data into formula (6-2) to obtain the minimum contact conductive area S between the central conductive aluminum plate and the aluminum alloy shaft: ″ m 25925mm 2, the inner circumferential surface area of ​​the central conductive aluminum plate is larger than its minimum contact conductive area S ″ m.

[0107] The central conductive aluminum plate is provided with 12 evenly distributed weight-reducing fan-shaped holes, wherein the side with a longer arc length of the fan-shaped hole is close to the outer cylindrical surface of the central conductive aluminum plate and is 400 mm away, and the side with a shorter arc length of the fan-shaped hole is close to the outer cylindrical surface of the boss of the central conductive aluminum plate and is 260 mm away.

[0108] In order to ensure the conductivity of the cathode roller, the number and position of the weight-reducing fan-shaped holes on the central conductive aluminum plate cannot make their cross-sectional area smaller than its minimum conductive cross-sectional area S m , the minimum conductive cross-sectional area S of the central conductive aluminum plate m It is calculated by formula (7) as follows:

[0109] S m =I / [(n+m)·K1·J] (7)

[0110] The total design current I of the cathode roller of the embodiment is 70000A; the total number n of the side conductive aluminum plates included in the cathode roller of the embodiment is 2; the total number m of the center conductive aluminum plates included in the cathode roller of the embodiment is 1; the cross-sectional conductivity correction coefficient K1 is 1; the current density J of the aluminum alloy is 1.5A / mm 2 Substituting the data into formula (7) to obtain the minimum conductive cross-sectional area S of the central conductive aluminum plate of the cathode roller of the embodiment: m 15556mm 2 , the cross-sectional area of ​​the central conductive aluminum plate is greater than its minimum conductive cross-sectional area S m .

[0111] The aluminum alloy shaft, support cylinder, side conductive aluminum plate, center conductive aluminum plate, annular ribs and axial ribs constitute the conductive path of the cathode roller. The aluminum alloy materials constituting the conductive path have a conductivity of 40% IACS and a resistivity of 0.04Ω·mm at a temperature of 20°C to 70°C. 2 / m.

Claims

1. A large diameter cathode roller for producing electrolytic copper foil, characterized in that: The invention 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 tube (9) made of aluminum alloy, and a central conductive aluminum plate (10); wherein the support tube (9) is sleeved on the aluminum alloy shaft (1); the two side conductive aluminum plates (5) are sleeved on the aluminum alloy shaft (1); the outer circumferential surfaces of the side conductive aluminum plates are respectively fitted with the inner circumferential surfaces of the two ends of the support tube (9); the two titanium sleeves (2) are respectively sleeved on the surface of the aluminum alloy shaft (1) and are respectively located on the outer sides of the two side conductive aluminum plates (5), so that the side conductive aluminum plates are The end faces of the aluminum plates are respectively fitted with the end faces of the side conductive aluminum plates at the positions; the two titanium plates (4) are respectively sleeved on the outer circumferential surface of the titanium sleeve and are located on one side of the outer end faces of the side conductive aluminum plates (5); each titanium plate (4) is respectively fixedly connected to the side conductive aluminum plates (5) at the positions through a titanium bolt counterweight bar 7; the two titanium sheaths (3) are respectively sleeved on the outer circumferential surface of the titanium sleeve (2), and are respectively located on the outer sides of the titanium plates (4), and the inner end faces of the titanium sheaths (3) are fitted with the outer end faces of the titanium plates (4) at the positions; the outer ends of the titanium sheaths (3) are welded to the outer circumferential surface of the titanium sleeves, and the titanium sheaths and the inner ends of the titanium sleeves are respectively welded to the titanium plates; The central conductive aluminum plate (10) is located in the support tube (9) and is sleeved on the outer circumferential surface of the aluminum alloy shaft (1); the central conductive aluminum plate is located at the axial symmetric plane of the support tube.

2. The large diameter cathode roller for producing electrolytic copper foil according to claim 1, characterized in that: The inner wall surface of the support tube of the cathode roller is uniformly provided with a conductive path; the conductive path is composed of two side conductive aluminum plates (5), a central conductive aluminum plate (10), a plurality of annular ribs (11) and a plurality of axial ribs (14); the annular ribs are arranged axially on the inner circumferential surface of the support tube, and the center distance between each two adjacent annular ribs is 600 mm; the axial ribs are arranged circumferentially on the inner circumferential surface of the support tube, and the angle between each adjacent axial rib is 15°; a grid of conductive paths is formed by the perpendicular intersection between the annular ribs and the axial ribs; the two ends of each axial rib are respectively fixedly connected to the side conductive aluminum plate (5) at the end; The aluminum alloy materials constituting the conductive path have a conductivity greater than 40% IACS and a resistivity less than 0.04 Ω·mm at a temperature of 20°C to 70°C. 2 / m.

3. The large diameter cathode roller for producing electrolytic copper foil according to claim 1, characterized in that: The surfaces at both ends of the central conductive aluminum plate are respectively provided with cylindrical bosses to increase the conductive area of ​​the central conductive aluminum plate; the axial height of the boss is 10 mm and the outer diameter of the boss is 1300 mm; the central conductive aluminum plate is located in the support tube and is located at the axial symmetry plane of the central conductive aluminum plate; the distance between the central conductive aluminum plate and the side conductive aluminum plates located at both ends of the support tube is 600 mm; 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 tube.

4. The large diameter cathode roller for producing electrolytic copper foil according to claim 1, characterized in that: 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) S1=I / 2(K1·J) (2) Where: S1 is the minimum conductive cross-sectional area required for the aluminum alloy shaft to conduct electricity, in mm 2 ; I is the total design current of the cathode roller, unit A; K1 is the cross-sectional conductivity correction factor, the value is 1 to 1.5; J is the current density of the aluminum alloy, unit A / mm 2 .

5. The large diameter cathode roller for producing electrolytic copper foil as claimed in claim 4, characterized in that: The designed total current I is calculated by formula (1): I=1 / 2·k·s·j (1) Where: I is the total design current of the cathode roller, unit A; k is the total design current correction coefficient of the cathode roller, the value is 1-2; s is the outer circumference area of ​​the designed cathode roller titanium cylinder, unit mm 2 ; j is the current density of the titanium tube material, unit A / mm 2 .

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

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

8. The large diameter cathode roller for producing electrolytic copper foil according to claim 1, characterized in that: 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) Where: S2 is the minimum conductive cross-sectional area required for the support tube to conduct electricity, unit: mm 2 ; I is the total design current of the cathode roller, in A; K1 is the cross-sectional conductivity correction factor, which is 1 to 1.5; J is the current density of the aluminum alloy, in A / mm 2 .

9. The large diameter cathode roller for producing electrolytic copper foil according to claim 1, characterized in that: The minimum contact conductive area S between the central conductive aluminum plate and the support tube is determined by formula (6-1): ′ m : S ′ m ＝ I / [(n+m)·K2·J] (6-1) The minimum contact conductive area S between the central conductive aluminum plate and the aluminum alloy shaft is determined by formula (6-2): ″ m : S ″ m ＝ I / [(n+m)·K2·J] (6-2) Where: S ′ m It is the minimum contact conductive area between the central conductive aluminum plate and the support tube, in mm 2 ; S ″ m It is the minimum contact conductive area between the central conductive aluminum plate and the aluminum alloy shaft, in mm 2 ; I is the total design 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 central conductive aluminum plates contained in the cathode roller; K2 is the contact conductivity correction coefficient, which is 0.5 to 1; J is the current density of the aluminum alloy, in A / mm 2 .

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

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