Method for eliminating welding stress of large-size cathode roller

Abstract

The invention relates to the technical field of cathode roller preparation, and discloses a large-size cathode roller welding stress eliminating method which comprises an installation unit, a transmission unit and a vibration unit, the installation unit comprises an annealing furnace, a sliding door is arranged on the front side of the annealing furnace, supporting seats are fixedly installed on the periphery of the bottom of the annealing furnace, and every two of the four supporting seats are symmetrical to each other. According to the device, a jack in the driving assembly vertically moves up and down to drive the cathode roller to move up and down, when the jack vertically moves up and down, an overturning plate can be driven to overturn, and when the overturning plate overturns, a wedge-shaped block can be driven to horizontally move under the assistance of a second sliding mechanism; a knocking ball can be driven to horizontally move through a push plate fixedly mounted on a second sliding mechanism, and when the knocking ball moves to a certain position, the push plate can leave, so that the knocking ball can reciprocate under the assistance of a reset spring, the cathode roller is knocked, and reciprocating vibration is realized.

Description

Technical Field

[0001] This invention belongs to the field of cathode roller manufacturing technology, specifically, it relates to a method for eliminating welding stress in large-size cathode rollers. Background Technology

[0002] Cathode rollers are key components in the production of electrolytic copper foil, and they are typically quite large. Welding is a crucial step in the manufacturing process of cathode rollers. However, the welding process generates significant welding stress, which, if not promptly relieved, can severely impact the quality and lifespan of the cathode rollers.

[0003] However, existing cathode rollers often eliminate stress through a certain method, which can lead to residual stress after stress elimination, resulting in instability in the cathode roller after processing.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows:

[0006] A method for relieving welding stress in large-size cathode rollers includes the following steps:

[0007] Step 1: By placing the cathode roller on the placement plate, the operator can then use a jack to push the cathode roller above the heat insulation plate in the installation unit for heating.

[0008] Step 2: The control transmission unit can move the heated cathode roller downwards in a timely manner, so that it can drive the push plate in the transmission unit to move.

[0009] Step 3: When the push plate moves, it can drive the vibration unit to move, thereby vibrating the placed cathode roller to remove stress.

[0010] The installation unit includes an annealing furnace, a sliding door on the front side of the annealing furnace, and four support seats fixedly installed around the bottom of the annealing furnace, with the four support seats symmetrically arranged in pairs. A work box is installed at the bottom of the inner cavity of the annealing furnace, and a heat insulation plate is fixedly installed above the annealing furnace. The heat insulation plate has a slot in the middle, and a first flip plate and a second flip plate are rotatably arranged inside the slot. The first flip plate and the second flip plate are symmetrically arranged. A cathode roller is placed in the inner cavity of the annealing furnace, and a semi-circular slot is opened on the opposite side wall of the first flip plate and the second flip plate.

[0011] The vibration unit includes multiple rectangular cylinders, each of which is fixedly installed above the working box. Each rectangular cylinder is symmetrical to the other in pairs. A movable rod is inserted into the inner cavity of each rectangular cylinder. Each movable rod is symmetrical to the other in pairs. A striking ball is fixedly installed on one side wall opposite to each other in pairs of movable rods.

[0012] The transmission unit includes a drive assembly, which is used to drive the cathode roller to move vertically upward and enter above the heat insulation plate. The drive assembly can also be used to drive the striking ball to move and strike both ends of the cathode roller.

[0013] In a preferred embodiment of the present invention, the driving assembly includes a jack, which is installed at the bottom of the working chamber. A placement plate is fixedly installed above the jack, and a cathode roller is placed on the placement plate. A fixing plate is also fixedly installed on the jack.

[0014] In a preferred embodiment of the present invention, the inner cavity of the working box is provided with two flip plates, which are symmetrical to each other. A rotating rod is fixedly installed through each of the two flip plates, which are symmetrical to each other. Bearings are provided at both ends of the two rotating rods, and each bearing is symmetrical to each other. A torsion spring is provided on the side wall opposite to each flip plate.

[0015] In a preferred embodiment of the present invention, a movable block is provided above each of the opposite ends of the two flip plates. The two movable blocks are symmetrical to each other. A first L-shaped connecting rod is fixedly installed on each of the opposite side walls of the two movable blocks. Each of the first L-shaped connecting rods is symmetrical to each other. A first sliding mechanism is provided on each of the opposite side walls of each of the first L-shaped connecting rods.

[0016] In a preferred embodiment of the present invention, the first sliding mechanism includes a plurality of first sliding grooves, each of which is respectively opened on opposite side walls of the inner cavity of the working box. Each pair of first sliding grooves is symmetrical to each other. Each inner cavity of the first sliding groove is slidably mounted with a first slider. Each pair of first sliders is symmetrical to each other. The opposite side wall of each first slider is respectively fixedly connected to a first L-shaped connecting rod.

[0017] In a preferred embodiment of the present invention, the two movable blocks are respectively movably connected above the work box. A wedge-shaped block is provided above each of the two movable blocks. The two wedge-shaped blocks are symmetrical to each other. A second L-shaped connecting rod is fixedly installed at both ends of each of the two wedge-shaped blocks. Each pair of the second L-shaped connecting rods is symmetrical to each other. A second sliding mechanism is provided at the opposite end of each second L-shaped connecting rod.

[0018] In a preferred embodiment of the present invention, the second sliding mechanism includes a plurality of second sliding grooves, each of which is respectively opened above the work box. Each pair of second sliding grooves is symmetrical to each other. A second slider is slidably installed in the inner cavity of each second sliding groove. Each pair of second sliders is symmetrical to each other. A second L-shaped connecting rod is fixedly connected to one of the opposite side walls of each pair of second sliders. A fixing rod is also fixedly installed on one of the opposite side walls of each pair of fixing rods. A push plate is fixedly installed on one of the opposite side walls of each pair of fixing rods.

[0019] In a preferred embodiment of the present invention, rectangular slots are provided on the opposite side walls of the two wedge-shaped blocks, and supersonic probes are provided in the inner cavities of the two rectangular slots.

[0020] In a preferred embodiment of the present invention, each of the rectangular tube cavities is provided with a third sliding mechanism, the third sliding mechanism including two third sliding grooves, the two third sliding grooves being respectively opened on opposite side walls of the rectangular tube cavity, the two third sliding grooves being symmetrical to each other, a third slider being slidably installed in the cavity of each of the two third sliding grooves, the two third sliders being symmetrical to each other, a movable plate being fixedly installed on the opposite side wall of each of the two third sliders, a movable rod being fixedly installed on the movable plate, and a return spring being fixedly installed on the movable plate, the other end of the return spring being fixedly connected to the rectangular tube.

[0021] In a preferred embodiment of the present invention, each of the four movable plates has a placement rod fixedly connected to one of its opposite ends. The four placement rods are movably inserted through the rectangular tube, and an inclined block is fixedly installed at one end of each of the four placement rods away from the rectangular tube.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] In this invention, the vertical up-and-down movement of the jack in the drive assembly drives the cathode roller to move up and down. When the jack moves vertically up and down, it drives the flipping plate to flip. When the flipping plate flips, it drives the wedge block to move horizontally with the assistance of the second sliding mechanism. Thus, the push plate fixedly installed on the second sliding mechanism drives the striking ball to move horizontally. When the striking ball moves to a certain position, the push plate can then move away, allowing the striking ball to reciprocate with the assistance of the return spring, thereby striking the cathode roller and achieving reciprocating vibration.

[0024] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0025] In the attached diagram:

[0026] Figure 1 A diagram showing the heating and cooling changes of a cathode roller as part of a method for relieving welding stress in large-size cathode rollers;

[0027] Figure 2 A three-dimensional structural schematic diagram of a method for relieving welding stress in large-size cathode rollers;

[0028] Figure 3 A schematic cross-sectional view of an annealing furnace for a method of relieving welding stress in large-size cathode rollers;

[0029] Figure 4 A schematic cross-sectional view of the working box for a method of relieving welding stress in large-size cathode rollers;

[0030] Figure 5 This is a schematic diagram of the upper structure of the work box in a method for relieving welding stress in large-size cathode rollers.

[0031] Figure 6 A schematic cross-sectional view of a rectangular cylinder structure for a method of relieving welding stress in large-size cathode rollers;

[0032] Figure 7 A method for stress relief during welding of large-size cathode rollers Figure 6 Enlarged structural diagram at point A in the middle;

[0033] Figure 8 A bottom view of the working box structure for a method of eliminating welding stress in large-size cathode rollers;

[0034] Figure 9 This is a schematic diagram of the internal structure of the working box for a method of eliminating welding stress in large-size cathode rollers.

[0035] In the picture:

[0036] 100. Installation unit; 101. Annealing furnace; 1011. Sliding door; 1012. Support base; 102. Work box; 103. Heat insulation plate; 1031. First flip plate; 1032. Second flip plate; 1033. Semi-circular groove;

[0037] 200. Transmission unit; 201. Jack; 2011. Placement plate; 2012. Cathode roller; 2013. Fixing plate; 202. Tilting plate; 2021. Rotating rod; 2022. Bearing; 2023. Torsion spring; 203. Moving block; 2031. First L-shaped connecting rod; 2032. First slide groove; 2033. First slider; 204. Wedge-shaped block; 2041. Rectangular slot; 2042. Second L-shaped connecting rod; 2043. Second slide groove; 2044. Second slider; 2045. Fixing rod; 2046. Push plate;

[0038] 300. Vibration unit; 301. Rectangular cylinder; 3011. Third slide groove; 3012. Third slider; 3013. Moving plate; 3014. Moving rod; 3015. Striking ball; 3016. Placement rod; 3017. Inclined block; 3018. Return spring; 302. Ultrasonic wave detector. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention.

[0040] Example 1:

[0041] like Figures 1 to 9 As shown, a method for relieving welding stress in large-size cathode rollers includes the following steps:

[0042] Step 1: By placing the cathode roller 2012 onto the placement plate 2011, the operator can push the cathode roller 2012 above the heat insulation plate 103 in the installation unit 100 for heating by activating the jack 201.

[0043] Step 2: Control the transmission unit 200 to move the heated cathode roller 2012 downwards in a timely manner, so that it can drive the push plate 2046 in the transmission unit 200 to move.

[0044] Step 3: When the pusher plate 2046 moves, it can drive the vibration unit 300 to move, thereby vibrating the placed cathode roller 2012 to relieve stress through the vibration unit 300.

[0045] The installation unit 100 includes an annealing furnace 101. A sliding door 1011 is provided on the front side of the annealing furnace 101. Support seats 1012 are fixedly installed around the bottom of the annealing furnace 101, with each pair of support seats 1012 symmetrically arranged. A work box 102 is installed at the bottom of the inner cavity of the annealing furnace 101. A heat insulation plate 103 is fixedly installed above the annealing furnace 101. A slot is opened in the middle of the heat insulation plate 103, and a first rotating plate 1031 and a second rotating plate 1032 are rotatably arranged inside the slot. The first rotating plate 1031 and the second rotating plate 1032 are symmetrically arranged. A cathode roller 2012 is placed inside the inner cavity of the annealing furnace 101. The first rotating plate 1031 and the second rotating plate 1032 are positioned opposite each other. The side walls are all provided with semi-circular slots 1033; the vibration unit 300 includes a plurality of rectangular cylinders 301, each rectangular cylinder 301 is fixedly installed above the working box 102, each rectangular cylinder 301 is symmetrical to each other in pairs, each rectangular cylinder 301 has a moving rod 3014 inserted into its inner cavity, each moving rod 3014 is symmetrical to each other in pairs, and each moving rod 3014 has a striking ball 3015 fixedly installed on one side wall opposite to each other in pairs; the transmission unit 200 includes a drive assembly, which is used to drive the cathode roller 2012 to move vertically upward into the space above the heat insulation plate 103, and the drive assembly can also be used to drive the striking ball 3015 to move and strike both ends of the cathode roller 2012. In this invention, the vertical up-and-down movement of the jack 201 in the drive assembly can drive the cathode roller 2012 to move up and down. When the jack 201 moves vertically up and down, it can drive the flip plate 202 to flip. When the flip plate 202 flips, it can drive the wedge block 204 to move horizontally with the assistance of the second sliding mechanism. Thus, the push plate 2046 fixedly installed on the second sliding mechanism can drive the striking ball 3015 to move horizontally. When the striking ball 3015 moves to a certain position, the push plate 2046 can move away, so that with the assistance of the return spring 3018, the striking ball 3015 can reciprocate, thereby striking the cathode roller and realizing reciprocating vibration.

[0046] like Figures 3 to 6 and Figure 8 as well as Figure 9 As shown, in a specific embodiment, the drive assembly includes a jack 201, which is installed at the bottom of the inner cavity of the work box 102. A placement plate 2011 is fixedly installed above the jack 201, and a cathode roller 2012 is placed on the placement plate 2011. A fixing plate 2013 is also fixedly installed on the jack 201. In this configuration, the installation position and components of the drive assembly are determined.

[0047] Example 2:

[0048] The difference between Embodiment 1 and this embodiment is that: Figures 3 to 4 and Figure 8 as well as Figure 9 As shown, a method for relieving welding stress of a large-size cathode roller is provided. The inner cavity of the working box 102 is provided with two flipping plates 202, which are symmetrical to each other. A rotating rod 2021 is fixedly installed through each of the two flipping plates 202. The two rotating rods 2021 are symmetrical to each other. Bearings 2022 are respectively provided at both ends of the two rotating rods 2021. Each bearing 2022 is symmetrical to each other. A torsion spring 2023 is provided on the side wall opposite to the flipping plate 202 of each bearing 2022.

[0049] like Figures 3 to 4 and Figure 8 as well as Figure 9 As shown, in a specific embodiment, each of the two flip plates 202 has a movable block 203 above its opposite ends. The two movable blocks 203 are symmetrical to each other. A first L-shaped connecting rod 2031 is fixedly installed on each of the opposite side walls of the two movable blocks 203. Each pair of first L-shaped connecting rods 2031 is symmetrical to each other, and a first sliding mechanism is provided on each pair of opposite side walls of the working box 102. In this configuration, the first sliding mechanism includes multiple first sliding grooves 2032. Each first sliding groove 2032 is respectively opened on opposite side walls of the inner cavity of the working box 102. Each pair of first sliding grooves 2032 is symmetrical to each other. A first slider 2033 is slidably installed in the inner cavity of each first sliding groove 2032. Each pair of first sliders 2033 is symmetrical to each other, and each opposite side wall of the first slider 2033 is fixedly connected to the first L-shaped connecting rod 2031. In this configuration, the specific installation position and components of the first sliding mechanism are determined.

[0050] like Figures 3 to 4 and Figure 8 as well as Figure 9 As shown, furthermore, two movable blocks 203 are respectively movably inserted above the work box 102. A wedge-shaped block 204 is provided above each of the two movable blocks 203. The two wedge-shaped blocks 204 are symmetrical to each other, and a second L-shaped connecting rod 2042 is fixedly installed at both ends of each wedge-shaped block 204. Each pair of second L-shaped connecting rods 2042 is symmetrical to each other, and a second sliding mechanism is provided at the opposite end of each second L-shaped connecting rod 2042. In this configuration, the installation position and components of the wedge-shaped blocks 204 are determined.

[0051] like Figures 3 to 4 and Figure 8 as well as Figure 9As shown, the second sliding mechanism further includes multiple second slide grooves 2043, each second slide groove 2043 being respectively opened above the work box 102. Each pair of second slide grooves 2043 is symmetrical to each other. A second slider 2044 is slidably installed inside the cavity of each second slide groove 2043. Each pair of second sliders 2044 is symmetrical to each other. A second L-shaped connecting rod 2042 is fixedly connected to one of the opposite side walls of each pair of second sliders 2044. A fixing rod 2045 is also fixedly installed on one of the opposite side walls of each pair of fixing rods 2045. A push plate 2046 is fixedly installed on one of the opposite side walls of each pair of fixing rods 2045. In this configuration, the installation position and components of the second sliding mechanism are determined.

[0052] like Figures 3 to 4 and Figure 8 as well as Figure 9 As shown, furthermore, rectangular slots 2041 are provided on the opposite sidewalls of the two wedge-shaped blocks 204, and ultra-high-intensity wave detectors 302 are installed inside the cavities of the two rectangular slots 2041. In this configuration, the installation position of the ultra-high-intensity wave detectors 302 is determined.

[0053] Example 3:

[0054] The difference between Embodiment 2 and this embodiment is that: Figures 3 to 7 and Figure 9 As shown, a method for relieving welding stress in a large-size cathode roller includes a third sliding mechanism within the inner cavity of each rectangular cylinder 301. The third sliding mechanism comprises two third sliding grooves 3011, which are respectively formed on opposite side walls of the inner cavity of the rectangular cylinder 301. The two third sliding grooves 3011 are symmetrical to each other. A third slider 3012 is slidably mounted within the inner cavity of each of the two third sliding grooves 3011. The two third sliders 3012 are also symmetrical to each other. A movable plate 3013 is fixedly mounted on the opposite side wall of each of the two third sliders 3012. A movable rod 3014 is fixedly mounted on the movable plate 3013, and a return spring 3018 is also fixedly mounted on the movable plate 3013. The other end of the return spring 3018 is fixedly connected to the rectangular cylinder 301. In this configuration, the installation position and components of the third sliding mechanism are defined.

[0055] like Figures 3 to 7 and Figure 9 As shown, in a specific embodiment, four movable plates 3013 are fixedly connected to opposite ends of each other with placement rods 3016. The four placement rods 3016 movably pass through the rectangular tube 301, and tilting blocks 3017 are fixedly installed at the ends of the four placement rods 3016 away from the rectangular tube 301. In this configuration, the installation position and components of the tilting blocks 3017 are defined.

[0056] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following experimental examples are used to illustrate the present invention.

[0057] Experimental Example 1:

[0058] Table 1 shows the residual stress test results of one side sealing plate.

[0059]

[0060]

[0061] Experimental Example 2:

[0062] Table 2 shows the residual stress test results of the other side sealing plate.

[0063]

[0064] Experimental Example 3:

[0065] Table 3 shows the results of residual stress detection on one end ring.

[0066]

[0067]

[0068] Experiment Example 4:

[0069] Table 4 shows the residual stress test results of the other end ring.

[0070]

[0071] Based on Tables 1, 2, 3, and 4 above:

[0072] Based on the residual stress data, before the end ring was welded, there was an alternation of tensile and compressive stress, but the overall stress value was relatively small, with a maximum compressive stress of -62.3 MPa and a maximum tensile stress of 22.2 MPa. After the end ring was welded, the residual stress was all tensile stress, and the overall stress value was much larger, with a maximum tensile stress of 77.2 MPa.

[0073] According to the stress test results, there were 24 points before and after the vibration and impact. Among them, the residual stress decreased at 19 points, accounting for 79%, and the residual stress increased at 5 points (data marked with * in the table), accounting for about 21%.

[0074] According to Embodiments 1, 2 and 3, the following steps are performed: stress relief by overall annealing of the roller body after welding, stress relief by vibration of the roller body after rough machining in the second step, and stress relief by ultrasonic impact of the roller body after semi-finishing in the third step. Ultimately, these steps eliminate residual stress in the entire processing of the cathode roller, greatly improving the stability of the cathode roller after processing.

[0075] The implementation principle of the method for relieving welding stress in large-size cathode rollers according to the present invention is as follows:

[0076] First, the operator opens the sliding door 1011 and places the cathode roller 2012 onto the placement plate 2011 inside the annealing furnace 101. After placement, the operator closes the sliding door 1011 and starts the jack 201. This allows the jack 201 to push the placement plate 2011, causing the cathode roller 2012 to move vertically upward. When the cathode roller 2012 moves vertically upward, it can press the first flip plate 1031 and the second flip plate 1032 to flip and open, thus moving to a certain position above the heat insulation plate 103. At this point, the first flip plate 1031 and the second flip plate 1032 can reset, thus heating the placed cathode roller 2012 (wherein the resetting of the first flip plate 1031 and the second flip plate 1032 is existing technology).

[0077] When the cathode roller 2012 has finished heating, the operator starts the jack 201 in reverse, which can squeeze the first flip plate 1031 and the second flip plate 1032 to flip downward, so that the cathode roller 2012 can leave the heat insulation plate 103 and enter the heat insulation plate 103. At this time, the cathode roller 2012 continues to move downward, so it can squeeze the flip plate 202 with the assistance of the rotating rod 2021 and the bearing 2022 through the fixed plate 2013 fixedly installed on the jack 201. When the flip plate 202 flips, it can move vertically upward with the assistance of the first L-shaped connecting rod 2031, the first sliding groove 2032 in the first sliding mechanism and the first slider 2033.

[0078] When the moving block 203 moves vertically upward, it can push the wedge block 204 to move horizontally with the assistance of the second L-shaped connecting rod 2042, the second sliding groove 2043 in the second sliding mechanism, and the second slider 2044. When the second slider 2044 moves horizontally, it can drive the fixed rod 2045 and the push plate 2046 to move horizontally, thereby pushing the tilting block 3017 to move horizontally through the push plate 2046.

[0079] When the two tilting blocks 3017 move, the moving plate 3013 can be pressed by the placement rod 3016 and moved horizontally with the assistance of the third sliding groove 3011 and the third slider 3012 in the third sliding mechanism. When the moving plate 3013 moves horizontally, it can drive the moving rod 3014 to move horizontally, so that the striking ball 3015 abuts against the cathode roller 2012. At this time, the push plate 2046 just leaves the tilting block 3017, so that the reset spring 3018 can drive the moving plate 3013 to reset. Because the reset spring 3018 is reciprocating, it can strike the cathode roller 2012 back and forth, thereby completing the vibration of the cathode roller 2012. At this time, by activating the super wave detector 302, the cathode roller 2012 can be vibrated by the super wave.

Claims

1. A method for relieving welding stress in large-size cathode rollers, characterized in that, The following steps are included: Step 1: By placing the cathode roller (2012) on the placement plate (2011), the operator can push the cathode roller (2012) above the heat insulation plate (103) in the installation unit (100) by starting the jack (201) for heating; Step 2: The control transmission unit (200) can move the heated cathode roller (2012) downward in a timely manner, so that it can drive the push plate (2046) in the transmission unit (200) to move; Step 3: When the push plate (2046) moves, it can drive the vibration unit (300) to move, thereby vibrating the placed cathode roller (2012) to remove stress through the vibration unit (300); The installation unit (100) includes an annealing furnace (101), a sliding door (1011) is provided on the front side of the annealing furnace (101), and support seats (1012) are fixedly installed around the bottom of the annealing furnace (101). The four support seats (1012) are symmetrical to each other in pairs. A work box (102) is installed at the bottom of the inner cavity of the annealing furnace (101). A heat insulation plate (103) is also fixedly installed on the top of the annealing furnace (101). A slot is opened in the middle of the heat insulation plate (103), and a first flip plate (1031) and a second flip plate (1032) are rotatably arranged in the inner cavity of the slot. The first flip plate (1031) and the second flip plate (1032) are symmetrical to each other. A cathode roller (2012) is placed in the inner cavity of the annealing furnace (101). A semi-circular slot (1033) is opened on the opposite side wall of the first flip plate (1031) and the second flip plate (1032). The vibration unit (300) includes multiple rectangular tubes (301), each of which is fixedly installed above the work box (102). Each of the rectangular tubes (301) is symmetrical to each other in pairs. Each of the rectangular tubes (301) has a movable rod (3014) inserted into its inner cavity. Each of the movable rods (3014) is symmetrical to each other in pairs. A striking ball (3015) is fixedly installed on one side wall of each of the two opposite sides of each movable rod (3014). The transmission unit (200) includes a drive assembly for driving the cathode roller (2012) to move vertically upwards above the heat insulation plate (103). The drive assembly can also be used to drive the striking ball (3015) to move and strike both ends of the cathode roller (2012).

2. The method for relieving welding stress in large-size cathode rollers according to claim 1, characterized in that, The drive assembly includes a jack (201), which is installed at the bottom of the inner cavity of the work box (102). A placement plate (2011) is fixedly installed above the jack (201), and a cathode roller (2012) is placed on the placement plate (2011). A fixing plate (2013) is also fixedly installed on the jack (201).

3. The method for relieving welding stress in large-size cathode rollers according to claim 1, characterized in that, The inner cavity of the work box (102) is provided with two flip plates (202), which are symmetrical to each other. A rotating rod (2021) is fixedly installed on each of the two flip plates (202). The two rotating rods (2021) are symmetrical to each other. A bearing (2022) is provided at both ends of the two rotating rods (2021). Each bearing (2022) is symmetrical to each other. A torsion spring (2023) is provided on the side wall of each bearing (2022) opposite to the flip plate (202).

4. The method for relieving welding stress of a large-size cathode roller according to claim 3, characterized in that, Each of the two flip plates (202) has a movable block (203) above its opposite end. The two movable blocks (203) are symmetrical to each other. Each of the two movable blocks (203) has a first L-shaped connecting rod (2031) fixedly installed on its opposite side wall. Each of the first L-shaped connecting rods (2031) is symmetrical to each other. Each of the two opposite side walls of the first L-shaped connecting rods (2031) has a first sliding mechanism.

5. The method for relieving welding stress of a large-size cathode roller according to claim 4, characterized in that, The first sliding mechanism includes a plurality of first slide grooves (2032), each of the first slide grooves (2032) being respectively opened on opposite side walls of the inner cavity of the work box (102), each of the first slide grooves (2032) being symmetrical to each other, each of the first slide grooves (2032) having a first slider (2033) slidably installed in the inner cavity of each first slide groove (2032), each of the first sliders (2033) being symmetrical to each other, and each of the opposite side walls of the first sliders (2033) being fixedly connected to the first L-shaped connecting rod (2031).

6. The method for relieving welding stress in large-size cathode rollers according to claim 4, characterized in that, Two movable blocks (203) are respectively movably connected above the work box (102). A wedge block (204) is provided above each of the two movable blocks (203). The two wedge blocks (204) are symmetrical to each other. A second L-shaped connecting rod (2042) is fixedly installed at both ends of each of the two wedge blocks (204). Each second L-shaped connecting rod (2042) is symmetrical to each other. A second sliding mechanism is provided at the opposite end of each second L-shaped connecting rod (2042).

7. The method for relieving welding stress in large-size cathode rollers according to claim 6, characterized in that, The second sliding mechanism includes a plurality of second slide grooves (2043), each of which is opened above the work box (102). Each of the second slide grooves (2043) is symmetrical to each other. A second slider (2044) is slidably installed in the inner cavity of each of the second slide grooves (2043). Each of the second sliders (2044) is symmetrical to each other. A second L-shaped connecting rod (2042) is fixedly connected to one of the opposite side walls of each of the second sliders (2044). A fixing rod (2045) is also fixedly installed on one of the opposite side walls of each of the second sliders (2044). A push plate (2046) is fixedly installed on one of the opposite side walls of each of the fixing rods (2045).

8. The method for relieving welding stress of a large-size cathode roller according to claim 6, characterized in that, The two wedge-shaped blocks (204) each have a rectangular slot (2041) on one side wall opposite to each other, and the inner cavity of the two rectangular slots (2041) is provided with a super-scan probe (302).

9. The method for relieving welding stress in large-size cathode rollers according to claim 1, characterized in that, Each of the rectangular tubes (301) is provided with a third sliding mechanism, which includes two third sliding grooves (3011). The two third sliding grooves (3011) are respectively opened on the opposite side walls of the inner cavity of the rectangular tube (301). The two third sliding grooves (3011) are symmetrical to each other. A third slider (3012) is slidably installed in the inner cavity of each of the two third sliding grooves (3011). The two third sliders (3012) are symmetrical to each other. A moving plate (3013) is fixedly installed on the opposite side wall of each of the two third sliders (3012). A moving rod (3014) is fixedly installed on the moving plate (3013). A return spring (3018) is also fixedly installed on the moving plate (3013). The other end of the return spring (3018) is fixedly connected to the rectangular tube (301).

10. A method for relieving welding stress in large-size cathode rollers according to claim 9, characterized in that, Each of the four movable plates (3013) has a placement rod (3016) fixedly connected to one of its opposite ends. The four placement rods (3016) are respectively movably inserted through the rectangular tube (301). An inclined block (3017) is fixedly installed at one end of each of the four placement rods (3016) away from the rectangular tube (301).

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