Online current monitoring device and monitoring method and application of online current monitoring device and monitoring method in copper foil electrolysis

Abstract

The invention relates to the technical field of current monitoring, in particular to an on-line current monitoring device and method and application of the on-line current monitoring device and method in copper foil electrolysis, and the on-line current monitoring device comprises an electrolytic bath and an anode plate arranged in the electrolytic bath; the cathode roller module is rotationally arranged in the middle of the electrolytic bath and is positioned above the anode plate; the light emitting module is arranged above the cathode roller module, and the emitting end of the light emitting module faces the outer wall of the cathode roller module; the light reflecting module is arranged above the cathode roller module and is used for reflecting the light rays emitted by the light emitting module; the light receiving module is arranged above the cathode roller module and is used for receiving the light rays reflected by the light reflecting module; by arranging the light emitting module, the light reflecting module and the light receiving module, the current density of each area of the cathode roller module can be monitored in real time, and whether the current density distribution of the cathode roller module is uniform or not can be accurately judged by detecting the drop point and the intensity of light.

Description

Technical Field

[0001] The present invention relates to the technical field of current monitoring, and particularly relates to an on-line current monitoring device, a monitoring method and their application in electrolytic copper foil production. Background Art

[0002] The manufacturing process of electrolytic copper foil involves supplying power to the electrolytic cell of the copper foil forming machine, and forming a deposit on the surface of the cathode roller through an electrochemical reaction. This production process has extremely high precision requirements for the thickness and surface density of the copper foil, and any slight deviation is unacceptable. The specifications and unit mass of the copper foil are directly affected by the magnitude of the operating current. Therefore, to ensure the stability of the electrolytic copper foil process, the key lies in maintaining a constant operating current of the copper foil forming machine.

[0003] Currently, the method for monitoring the on-line current of the copper foil forming machine is to preset the total operating current value through a touch panel. Subsequently, this set value is received by the control main board, and after precise calculation, the total current is scientifically distributed to four power supply cabinets. Each power supply cabinet is equipped with a Hall sensor to execute and monitor the actual operating current.

[0004] However, in the process of detecting the current in the prior art, it is easily affected by electricity or magnetism, resulting in a deviation between the detected value of the current and the actual value, and further causing uneven thickness distribution of the copper foil.

[0005] In view of the above problems, Chinese Patent with application number CN202310011276.9 discloses a power supply current monitoring device for a copper foil forming machine, which relates to the technical field of copper foil forming machine accessories, including an electrolytic cell, a high-frequency power supply, a busbar and a current monitoring component. The current monitoring component is arranged outside the busbar, and multiple groups of busbars and current monitoring components are provided. By setting the busbar and the current monitoring component, the busbar can realize the transmission of current between the high-frequency power supply and the electrolytic cell, and the current monitoring component is arranged around the outside of the busbar. During the process of the busbar transmitting current, the current monitoring component can monitor the current and transmit the monitoring information to a data display outside the electrolytic cell to realize the current monitoring during the working process of the copper foil forming machine. The current monitoring component, the busbar and the high-frequency power supply correspond one by one, so as to realize the simultaneous monitoring of multiple power supplies, and further facilitate the staff to timely adjust the high-frequency power supply for the copper foil forming machine.

[0006] In summary, although the existing patent design can monitor the current flowing into the copper foil forming machine in real time by introducing a current monitoring component, however, in the actual application process, there is a direct relationship between the thickness of the copper foil and the uniformity of the current density distributed on the cathode roller. Although there is a method in the prior art to reflect the current density distributed on the cathode roller by detecting the thickness of the copper foil, this method cannot reflect the reason for the uneven current density distribution on the cathode roller.

[0007] Therefore, in view of the limitations of current current monitoring technologies, it is particularly urgent and important to develop an on-line current monitoring device, a monitoring method and their application in electrolytic copper foil production to promote the development of related technical fields. Summary of the Invention

[0008] The purpose of the present invention is to provide an on-line current monitoring device, a monitoring method and their application in electrolytic copper foil production to solve the technical problems raised in the above background technology.

[0009] To achieve the above object, the present invention provides the following technical solutions: An on-line current monitoring device includes an electrolytic cell and an anode plate disposed inside the electrolytic cell; It further includes a cathode roll module rotatably disposed in the middle of the electrolytic cell and located above the anode plate; An optical emission module is disposed above the cathode roll module, and its emission end faces the outer wall of the cathode roll module; An optical reflection module is disposed above the cathode roll module for reflecting the light emitted by the optical emission module; An optical reception module is disposed above the cathode roll module for receiving the light reflected by the optical reflection module; The light emitted from the optical emission module is reflected by the cathode roll module and the optical reflection module and falls on the optical reception module. By detecting the landing point of the light on the optical reception module, it is determined whether the current density distribution on the cathode roll module is uniform.

[0010] Preferably, the optical emission module includes: A mounting seat. There is a mounting plate above the cathode roll module. There is a mounting seat outside the mounting plate, and a power element is disposed inside the mounting seat; A movable block. There is a movable slot inside the mounting seat. A movable block is disposed inside the movable slot, and an optical emission head is disposed outside the movable block; An elastic member. An elastic member is disposed outside the movable block, and the end of the elastic member away from the movable block is connected to the movable slot.

[0011] Preferably, a ferromagnetic block is disposed inside the movable block, and the movable block slides inside the movable slot under the magnetic traction of the cathode roll module.

[0012] Preferably, the optical reflection module includes a mounting portion disposed above the cathode roll module. The mounting portion is provided with rotation members distributed in an array. A reflecting member is disposed outside the rotation member, and the rotation member can drive the reflecting member to rotate around the mounting portion as the center.

[0013] Preferably, the optical receiving module includes a base disposed above the cathode roll module. A separator is provided on the outer side of the base. The separator divides the base into different intervals, and a receiving portion is provided on each interval. The receiving portion is used to receive the light reflected by the light reflection module.

[0014] Preferably, the cathode roll module includes: A rotating shaft, which is rotatably connected to the middle of the electrolytic cell. A conductive bushing is provided on the outer side of the rotating shaft, and conductive rings are provided at both ends of the conductive bushing; A conductive cylinder, which is disposed on the outer side of the conductive bushing. A titanium cylinder is provided on the outer side of the conductive cylinder, and side plates are provided at both ends of the titanium cylinder. The side plates are connected to the conductive bushing.

[0015] Preferably, a connection assembly is provided between the conductive cylinder and the conductive bushing. The connection assembly includes: An outer connection ring and an inner connection ring. The outer connection rings are arrayed on the outer side of the conductive bushing, and the inner connection rings are arrayed on the inner side of the conductive cylinder; Conductive belts, which are arrayed between two opposite outer connection rings and inner connection rings. Both ends of the conductive belt are respectively connected to the outer connection ring and the inner connection ring. A temperature sensor is provided at the connection of the conductive belt with the outer connection ring and the inner connection ring.

[0016] Preferably, a stripping roll is provided on the outer side of the cathode roll module. The stripping roll is used to strip the copper foil on the surface of the cathode roll module.

[0017] A monitoring method for monitoring current by using an on-line current monitoring device. The monitoring method includes the following steps: S1. During the operation of the cathode roll module, use the light emitting module to project light rays onto its outer surface. After the light rays are reflected, they pass through the light reflection module and the light receiving module in sequence. By analyzing the reflection area and position information of the light rays on the light receiving module, evaluate the uniformity of the current density distribution of the cathode roll module; S2. If the light spot is located in the upper half area of the light receiving module and its position is constantly changing, it indicates that there is an uneven phenomenon on the outer wall of the cathode roll module, resulting in a change in the position of the light emitting head in the movable slot, and further causing the light spot to deviate from the preset position; S3. If the light spot is located in the lower half area of the light receiving module, it indicates that the internal connection assembly of the cathode roll module is loose, resulting in the tilt of the light reflection module, and further causing the light spot to deviate from the preset position.

[0018] An application of an on-line current monitoring device in electrolytic copper foil.

[0019] The technical effects and advantages of the present invention: 1. The present invention can monitor the current density of each area of ​​the cathode roller module in real time by setting a light emitting module, a light reflecting module and a light receiving module. By detecting the landing point and intensity of the light, it can accurately determine whether the current density distribution of the cathode roller module is uniform; this real-time monitoring function can promptly discover the problem of uneven current density distribution, avoid copper foil production defects caused by uneven current distribution, and improve production efficiency and product quality.

[0020] 2. The online current monitoring device of the present invention can distinguish the uneven current density distribution caused by different reasons. When impurities are deposited on the surface of the titanium tube, the magnetic field strength in the impurity area is enhanced, and the movable block moves to the bottom of the movable groove, causing the light to fall into the upper half of the receiving part; when corrosion occurs on the surface of the titanium tube, the magnetic field strength in the corrosion area is weakened, and the movable block moves to the top of the movable groove, causing the light to fall into the lower half of the receiving part; in addition, if the conductive belt connection is loose, the magnetic field strength in the loose area is weakened, the movable block moves, and the reflector is deflected, the light path changes, and finally falls into the upper half of the receiving part; by analyzing the landing position and distribution pattern of the light, different situations such as impurity deposition, surface corrosion and loose connection can be clearly distinguished, providing a basis for targeted maintenance and repair, avoiding blind repairs, and improving the reliability and service life of the equipment.

[0021] 3. The present invention realizes high-precision monitoring of the current density in each area of ​​the cathode roller module by setting up multiple light emitting heads, reflectors and receiving parts, and ensuring that their number and position correspond to each other. The light emitting head projects light directional onto the surface of the titanium cylinder, and the smooth mirror surface of the titanium cylinder reflects the light to the reflector, which then emits the light to the photoelectric sensor of the receiving part; by detecting the size of the value received by the photoelectric sensor and the location of the light, the change in current density can be accurately determined; this high-precision monitoring method can detect tiny changes in current density, avoid local overheating and uneven copper foil quality caused by uneven current distribution, thereby improving the stability and product quality of the entire electrolytic copper foil production. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the main structure of the present invention; Figure 2 It is a structural schematic diagram of the cathode roller module of the present invention; Figure 3 It is a structural schematic diagram of the optical transmission module of the present invention; Figure 4 It is a structural schematic diagram of the mounting seat of the present invention; Figure 5 It is a structural schematic diagram of the optical receiving module of the present invention; Figure 6 This is a schematic diagram of a first working state of the optical transmission module of the present invention; Figure 7 Schematic diagram of the second working state of the optical emission module of the present invention; Figure 8 Schematic diagram of the third working state of the optical emission module of the present invention; Figure 9 Schematic diagram of the fourth working state of the optical emission module of the present invention; Figure 10 Schematic diagram of the principle of the electrolytic copper foil of the present invention; Figure 11 Logic control diagram of the present invention.

[0023] Reference numerals are: 1. Electrolytic cell; 2. Anode plate; 3. Cathode roller module; 301. Rotating shaft; 302. Conductive bushing; 303. Conductive ring; 304. Side plate; 305. Conductive cylinder; 306. Titanium cylinder; 307. Connection assembly; 3071. Outer connection ring; 3072. Inner connection ring; 3073. Conductive belt; 4. Optical emission module; 401. Mounting plate; 402. Mounting seat; 403. Activity slot; 404. Activity block; 405. Optical emission head; 406. Elastic member; 5. Optical reflection module; 501. Mounting part; 502. Rotating member; 503. Reflecting member; 6. Optical receiving module; 601. Base; 602. Partition member; 603. Receiving part; 7. Stripping roller. Detailed implementation manners

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] Embodiment 1 Referring to Figures 1 to 10 as shown, the present invention provides an on-line current monitoring device, including an electrolytic cell 1 and an anode plate 2 arranged inside the electrolytic cell 1.

[0026] It further includes a cathode roller module 3, which is rotatably arranged in the middle of the electrolytic cell 1 and is located above the anode plate 2.

[0027] The cathode roller module 3 includes a rotating shaft 301, the rotating shaft 301 is rotatably connected to the middle of the electrolytic cell 1, and a conductive bushing 302 is arranged outside the rotating shaft 301, and conductive rings 303 are arranged at both ends of the conductive bushing 302.

[0028] The conductive cylinder 305 is arranged outside the conductive bushing 302. A titanium cylinder 306 is provided outside the conductive cylinder 305. Side plates 304 are provided at both ends of the titanium cylinder 306, and the side plates 304 are connected to the conductive bushing 302.

[0029] Refer to Figure 1 、 Figure 2 As shown in the figure, a connection assembly 307 is provided between the conductive cylinder 305 and the conductive bushing 302. The connection assembly 307 includes an outer connection ring 3071 and an inner connection ring 3072. The outer connection rings 3071 are arrayed outside the conductive bushing 302, and the inner connection rings 3072 are arrayed inside the conductive cylinder 305.

[0030] Conductive bands 3073 are arrayed between two opposite outer connection rings 3071 and inner connection rings 3072. Both ends of the conductive bands 3073 are respectively connected to the outer connection ring 3071 and the inner connection ring 3072.

[0031] The conductive bands 3073 are mainly composed of copper stranded wire bands or conductive bars. Their arrangement realizes the reliable electrical connection between the conductive bushing 302 and the conductive cylinder 305, enhancing the uniformity of the electrical conductivity on the surface of the cathode roller.

[0032] Refer to Figures 1 to 10 As shown in the figure, a stripping roller 7 is provided outside the cathode roller module 3. The stripping roller 7 is used to strip the copper foil on the surface of the cathode roller module 3.

[0033] There is an electrolyte solution (usually a solution containing copper ions) in the electrolytic cell 1. The anode plate 2 serves as the electrode where the oxidation reaction occurs. During the electrolysis process, metal atoms on the surface of the anode plate 2 (if there is a slight dissolution of the anode plate 2, such as an anode made of titanium-containing materials) or certain substances in the solution lose electrons and undergo an oxidation reaction to enter the solution. The cathode roller module 3 serves as the electrode where the reduction reaction occurs. Since the rotating shaft 301 of the cathode roller module 3 is connected to the negative pole of the power supply through conductive structures such as the conductive bushing 302, electrons are conducted from the negative pole of the power supply to the conductive bushing 302, the conductive cylinder 305 and other structures of the cathode roller module 3. Copper ions (Cu²⁺) in the solution move towards the surface of the cathode roller module 3 under the action of the electric field and obtain electrons on the surface of the cathode roller module 3 to undergo a reduction reaction: Cu²⁺ + 2e⁻ = Cu, thereby gradually depositing to form a copper foil on the surface of the cathode roller module 3 (specifically, on the surface of the titanium cylinder 306). As the electrolysis process continues, the copper foil continuously grows on the surface of the cathode roller module 3. When it reaches a certain thickness and forms a firm copper layer of the metal phase, the copper foil on the surface of the cathode roller module 3 is stripped by the stripping roller 7 provided outside the cathode roller module 3, thus obtaining an electrolytic copper foil product.

[0034] In this embodiment, by installing the connection component 307 between the conductive bushing 302 and the conductive cylinder 305, direct conduction of current is achieved: the current on the conductive bushing 302 directly acts on the conductive cylinder 305 via the conductive strip 3073, ensuring uniform distribution of current on the surface of the cathode roller. This effectively alleviates the problem of copper foil thickness deviation caused by uneven current density distribution on the surface of the cathode roller during the electrolytic copper foil process, making the copper foil thickness more in line with the specified standard.

[0035] Embodiment 2 Although the above embodiment successfully realizes uniform distribution of current on the surface of the cathode roller by arranging the connection component 307 between the conductive bushing 302 and the conductive cylinder 305, after running for a certain period of time, factors such as vibration and thermal expansion will cause the conductive strip 3073 to deform, resulting in loosening or detachment of the connection part, forming a virtual connection and affecting the conductive performance of the roller body. In addition, if impurities in the electrolyte adhere to the cathode roller, it will also cause uneven distribution of current density on the surface of the roller body, which has an adverse effect on the subsequent copper foil production. There is a lack of an on-line current monitoring device in the prior art that can distinguish the uneven distribution of current density on the roller body caused by different situations. In view of this, we have made technical improvements on the basis of Embodiment 1. The specific improved technical solution is as follows: Refer to Figures 1 to 11 As shown, the present invention provides an on-line current monitoring device, including a light emission module 4, which is arranged above the cathode roller module 3, and its emission end faces the outer wall of the cathode roller module 3.

[0036] A light reflection module 5, which is arranged above the cathode roller module 3 and is used to reflect the light emitted by the light emission module 4.

[0037] A light receiving module 6, which is arranged above the cathode roller module 3 and is used to receive the light reflected by the light reflection module 5.

[0038] The light emitted from the light emission module 4 falls onto the light receiving module 6 after being reflected by the cathode roller module 3 and the light reflection module 5. By detecting the landing point of the light on the light receiving module 6, it is judged whether the current density distribution on the cathode roller module 3 is uniform.

[0039] Refer to Figures 1 to 4 As shown, the light emission module 4 includes a mounting seat 402. There is a mounting plate 401 above the cathode roller module 3. The mounting seat 402 is arranged outside the mounting plate 401, and a power element is arranged inside the mounting seat 402.

[0040] A movable block 404. There is a movable groove 403 inside the mounting seat 402. The movable block 404 is arranged inside the movable groove 403. A light emitting head 405 is arranged outside the movable block 404, and the power element is electrically connected to the light emitting head 405.

[0041] An elastic member 406 is provided outside the movable block 404. One end of the elastic member 406 away from the movable block 404 is connected to the movable slot 403.

[0042] The elastic member 406 includes a spring. One end of the spring is connected to the movable block 404, and the other end of the spring is connected to the movable slot 403.

[0043] A ferromagnetic block is provided inside the movable block 404. The movable block 404 slides inside the movable slot 403 under the magnetic field traction of the cathode roller module 3.

[0044] When the current density distribution in some areas on the surface of the cathode roller is uneven, the magnetic fields in these areas will also be affected. At this time, the ferromagnetic block in the movable block 404 is affected by the magnetic field, driving the movable block 404 to move inside the movable slot 403, thereby changing the position of the light emitting head 405.

[0045] Refer to Figures 1 to 10 As shown, the light reflection module 5 includes a mounting portion 501 provided above the cathode roller module 3. Rotating members 502 are arranged in an array on the mounting portion 501, and a reflecting member 503 is provided outside the rotating members 502. The rotating member 502 can drive the reflecting member 503 to rotate around the mounting portion 501 as the center.

[0046] A temperature sensor is provided at the connection of the conductive belt 3073 with the outer connection ring 3071 and the inner connection ring 3072.

[0047] The temperature sensor is electrically connected to the rotating member 502. When the value sensed by the temperature sensor exceeds the set value, the temperature sensor sends an electrical signal to the rotating member 502, causing the corresponding rotating member 502 on the mounting portion 501 to drive the reflecting member 503 to deflect, so as to change the landing point of the light.

[0048] Refer to Figure 5 As shown, the light receiving module 6 includes a base 601 provided above the cathode roller module 3. A partition member 602 is provided outside the base 601. The partition member 602 divides the base 601 into different intervals, and a receiving portion 603 is provided on each interval. The receiving portion 603 is used to receive the light reflected by the light reflection module 5.

[0049] The receiving portion 603 includes photoelectric sensors arranged in an array in each interval. By detecting the magnitude of the received value of the photoelectric sensors, the landing point of the light in a single interval can be determined.

[0050] It should be noted that: in this embodiment, the number and positions of the communication components, the light emitting head 405, and the receiving portion 603 correspond to each other. By setting the communication components, the light emitting head 405, and the receiving portion 603, the current density of each area of the cathode roller module 3 can be monitored in real time, improving the accuracy of current monitoring.

[0051] During use, the light-emitting head 405 on the mounting base 402 is activated, and the light-emitting head 405 projects light towards the outer surface of the titanium cylinder 306. Since the surface of the titanium cylinder 306 is a smooth mirror surface, after the light hits the surface of the titanium cylinder 306, it is reflected by the outer surface of the titanium cylinder 306 to the reflecting member 503, and the reflecting member 503 then emits the light to the receiving part 603. By analyzing the landing points and intensities of the light on each receiving part 603, it is possible to determine whether the current density distribution of the cathode roller module 3 is uniform.

[0052] It should be noted that: referring to Figure 5 As shown, the dashed line L divides the receiving part 603 into two different regions. The upper half region is the A region, and the lower half region is the B region. Initially, the landing point of the light is at the middle of the receiving part 603 and at the dashed line L in Figure 5 (specifically as shown in Figure 6 ).

[0053] When the cathode roller module 3 rotates to a specific angle, if the light emitted by some of the light-emitting heads 405 falls into the A region of the corresponding receiving part 603, and the light emitted by the other light-emitting heads 405 around this light-emitting head 405 falls into the B region of the corresponding receiving part 603, this phenomenon indicates that there is a co-deposition of impurities at the landing point of the light on the surface of the titanium cylinder 306 (i.e., impurities adhere to the surface of the titanium cylinder 306). The specific mechanism is as follows: After conductive impurities are deposited on the surface of the titanium cylinder 306, a heterogeneous interface will be formed, which will cause local electric field distortion. Specifically, the conductive impurity particles act as "tips" in the electric field, inducing the tip discharge effect, which makes the current density in this region increase abnormally. This abnormal increase in current density further causes the magnetic field strength in the impurity adhesion region to also increase.

[0054] As the magnetic field strength increases, the magnetic suction force on the ferromagnetic block in the movable block 404 also increases. Under the action of the magnetic suction force, the ferromagnetic block drives the movable block 404 to move towards the bottom of the movable groove 403. This movement changes the relative position of the light-emitting head 405, thereby affecting the landing point of the light on the titanium cylinder 306. Eventually, the light emitted by the light-emitting head 405 in the impurity adhesion region falls into the A region of the corresponding receiving part 603 due to the change in position.

[0055] According to the principle of current continuity, the total current must be continuous in a conductor. Therefore, when conductive impurities adhere to the surface of the cathode roller and cause the current density in this region to increase, in order to maintain the continuity of the total current, the current density in the surrounding region may decrease accordingly.

[0056] When the current density in the surrounding area decreases, the magnetic field strength generated thereby also weakens. The weakening of the magnetic field strength results in a decrease in the attractive force on the ferromagnetic body in the movable block 404. Under the action of the elastic restoring force of the elastic member 406, the movable block 404 begins to move towards the top of the movable groove 403. This displacement change ultimately causes the light emitted by the light emitting head 405 on the periphery of the impurity adhesion area to be guided to area B of the corresponding receiving part 603.

[0057] When the cathode roller module 3 rotates to a certain angle, a phenomenon occurs where the light emitted by some of the light emitting heads 405 falls into area B of the corresponding receiving part 603, and the light emitted by the remaining light emitting heads 405 on the periphery of this light emitting head 405 falls into area A of the corresponding receiving part 603, indicating that erosion has occurred at the point where the light falls on the surface of the titanium cylinder 306 (i.e., the surface roughness of the titanium cylinder 306 has increased). The specific mechanism is as follows: When erosion occurs on the surface of the titanium cylinder 306, the oxides or corrosion products generated on the surface of the erosion area have high resistance characteristics, hindering electron conduction. According to Ohm's law, the increase in resistance leads to a significant decrease in the local current density. The current is forced to bypass to the surrounding undamaged low-resistance areas, resulting in an increase in the current density in the surrounding areas. This change in the current density further triggers a corresponding adjustment of the magnetic field strength. In the erosion area, due to the decrease in the current density, the magnetic field strength generated thereby also weakens. The weakening of the magnetic field strength results in a decrease in the attractive force on the ferromagnetic body in the movable block 404. Under the action of the elastic restoring force of the elastic member 406, the movable block 404 begins to move towards the top of the movable groove 403. This displacement change ultimately causes the light emitted by the light emitting head 405 corresponding to the impurity covering area to be guided to area B of the corresponding receiving part 603.

[0058] At the same time, due to the increase in the current density around the erosion area, the light emitted by the light emitting heads 405 corresponding to these areas is guided to area A of the corresponding receiving part 603. This light signal distribution pattern provides a direct basis for detecting and analyzing the current density distribution on the surface of the cathode roller.

[0059] When the cathode roller module 3 rotates to a certain angle, if the light projected by some of the light emitting heads 405 falls into area A of the corresponding receiving part 603, and the position of the landing point of these lights is much higher than the position of the movable block 404 at the bottom of the movable groove 403, this phenomenon indicates that after the cathode roller module 3 has been operating for a certain period of time, the conductive belt 3073 may become loose at its connection with the outer connection ring 3071 or the inner connection ring 3072 due to factors such as vibration and thermal expansion. This looseness further affects the conductivity of the titanium cylinder 306. The specific mechanism is described as follows: The looseness of the connection will significantly increase the contact resistance. As the contact resistance increases, more Joule heat will be generated at the contact point according to Joule's law. This heat accumulation triggers the temperature sensor to send an electrical signal to the relevant rotating member 502. The rotating member 502 that receives the signal then drives the reflective member 503 to deflect away from the optical transmission module 4.

[0060] At the same time, if the internal wire has poor contact, the conductivity of the area will decrease, and the current density will decrease accordingly. The decrease in current density leads to a decrease in the magnetic field intensity generated in the area. The weakened magnetic field also reduces the attraction of the ferromagnetic body in the movable block 404. Under the elastic force of the elastic member 406, the movable block 404 begins to move toward the top of the movable slot 403.

[0061] The displacement change of the movable block 404, together with the deflection of the reflector 503 due to the influence of the temperature sensor, together cause the light that should have been emitted by the light emitting head 405 corresponding to the impurity covered area and should have fallen into the B area to be changed in path and finally fall into the A area. This process comprehensively reflects the indirect influence of the loose connection of the conductive tape 3073 on the optical signal path of the system.

[0062] Embodiment 3 The present invention also provides a monitoring method for monitoring current using an online current monitoring device, the monitoring method comprising the following steps: S1. During the operation of the cathode roller module 3, the light emitting module 4 is used to project light to its outer surface. After reflection, the light passes through the light reflecting module 5 and the light receiving module 6 in sequence. By analyzing the reflection area and position information of the light on the light receiving module 6, the current density distribution uniformity of the cathode roller module 3 is evaluated.

[0063] S2. If the light landing point is located in the upper half of the light receiving module 6 and the position keeps changing, it indicates that the outer wall of the cathode roller module 3 is uneven, causing the position of the light emitting head 405 in the movable groove 403 to change, thereby causing the light landing point to deviate from the preset position.

[0064] S3. If the light landing point is located in the lower half of the light receiving module 6, it indicates that the internal connection component 307 of the cathode roller module 3 is loose, causing the light reflecting module 5 to tilt, thereby causing the light landing point to deviate from the preset position.

[0065] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An online current monitoring device, comprising an electrolytic cell and an anode plate arranged inside the electrolytic cell, characterized in that: A cathode roller module is rotatably arranged in the middle of the electrolytic cell and located above the anode plate; A light emitting module, which is arranged above the cathode roller module, with its emitting end facing the outer wall of the cathode roller module; A light reflection module, which is arranged above the cathode roller module and is used to reflect the light emitted by the light emission module; A light receiving module, which is arranged above the cathode roller module and is used to receive the light reflected by the light reflecting module; The light emitted from the light emitting module falls on the light receiving module after being reflected by the cathode roller module and the light reflecting module. The landing point of the light on the light receiving module is detected to determine whether the current density distribution on the cathode roller module is uniform.

2. The online current monitoring device according to claim 1, characterized in that: The optical transmission module comprises: A mounting seat, wherein a mounting plate is disposed above the cathode roller module, a mounting seat is disposed outside the mounting plate, and a power element is disposed inside the mounting seat; A movable block, wherein a movable groove is provided inside the mounting seat, a movable block is provided inside the movable groove, and a light emitting head is provided outside the movable block; An elastic member is provided on the outer side of the movable block, and one end of the elastic member away from the movable block is connected to the movable groove.

3. The online current monitoring device according to claim 2, characterized in that: A ferromagnetic block is arranged inside the movable block, and the movable block slides inside the movable groove under the pull of the magnetic field of the cathode roller module.

4. The online current monitoring device according to claim 1, characterized in that: The light reflection module comprises a mounting portion arranged above the cathode roller module, the mounting portion is provided with rotating members distributed in an array, a reflecting member is arranged outside the rotating member, and the rotating member can drive the reflecting member to rotate around the mounting portion as the center.

5. The online current monitoring device according to claim 1, characterized in that: The light receiving module comprises a base arranged above the cathode roller module, a partition is arranged outside the base, the partition divides the base into different sections, each section is provided with a receiving part, the receiving part is used to receive the light reflected by the light reflecting module.

6. The online current monitoring device according to claim 1, characterized in that: The cathode roller module comprises: A rotating shaft, the rotating shaft is rotatably connected to the middle of the electrolytic cell, a conductive sleeve is provided on the outer side of the rotating shaft, and conductive rings are provided at both ends of the conductive sleeve; A conductive cylinder is arranged on the outside of a conductive sleeve, a titanium cylinder is arranged on the outside of the conductive cylinder, side plates are arranged at both ends of the titanium cylinder, and the side plates are connected to the conductive sleeve.

7. The online current monitoring device according to claim 6, characterized in that: A connecting assembly is provided between the conductive cylinder and the conductive sleeve, and the connecting assembly comprises: An outer connecting ring and an inner connecting ring, wherein the outer connecting ring array is distributed on the outer side of the conductive sleeve, and the inner connecting ring array is distributed on the inner side of the conductive cylinder; Conductive belt, the conductive belt array is distributed between two opposite outer connecting rings and an inner connecting ring, the two ends of the conductive belt are respectively connected to the outer connecting ring and the inner connecting ring, and a temperature sensor is provided at the connection between the conductive belt and the outer connecting ring and the inner connecting ring.

8. The online current monitoring device according to claim 1, characterized in that: A stripping roller is provided on the outer side of the cathode roller module, and the stripping roller is used to strip the copper foil on the surface of the cathode roller module.

9. A method for monitoring current using the online current monitoring device according to any one of claims 1 to 8, characterized in that: The monitoring method comprises the following steps: S1. During the operation of the cathode roller module, the light emitting module is used to project light to its outer surface. After reflection, the light passes through the light reflecting module and the light receiving module in sequence. By analyzing the reflection area and position information of the light on the light receiving module, the current density distribution uniformity of the cathode roller module is evaluated; S2. If the light landing point is located in the upper half of the light receiving module and the position keeps changing, it indicates that the outer wall of the cathode roller module is uneven, causing the position of the light emitting head in the movable slot to change, which in turn causes the light landing point to deviate from the preset position; S3. If the light landing point is located in the lower half of the light receiving module, it indicates that the internal connection components of the cathode roller module are loose, causing the light reflecting module to tilt, thereby causing the light landing point to deviate from the preset position.

10. Use of the online current monitoring device according to any one of claims 1 to 8 in electrolytic copper foil.

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