Strip rolling dual mode current loading lubrication control device and method

Abstract

The application belongs to the technical field of metal plastic working equipment, and provides a strip rolling dual-working-condition current loading lubrication control device and method, which comprises multiple current loading subarea units, each of which is provided with an electrically conductive contact piece in contact with the strip; multiple lubrication subarea units, each of which is provided with a nozzle; a lubrication working condition switching unit for supplying the nozzle with an electrically conductive lubrication medium or a low-conductivity lubrication medium according to the conductivity of the currently used lubrication medium; and a working condition adapting mechanism comprising a limited flow guiding structure and an isolation structure, the limited flow guiding structure being used to form a limited flow channel between the strip and the nozzle, and the isolation structure being used to separate the lubrication medium from the electrically conductive contact piece. The application is compatible with lubrication media of different conductivities, reduces the bypass current, contact resistance fluctuation and local overheating risk caused by the lubrication medium, and improves the stability of current loading and lubrication control in the strip rolling process.

Description

Technical Field

[0001] This invention belongs to the technical field of metal plastic processing equipment, and particularly relates to a dual-condition current-loaded lubrication control device and method for strip rolling. Background Technology

[0002] During strip rolling, a lubricating medium is typically supplied to reduce friction, decrease rolling force, and improve the surface quality of the strip. In electrically assisted rolling or electric pulse assisted rolling, a stable current path needs to be established on the strip so that the current can be applied to the deformation area or its vicinity in a predetermined manner.

[0003] In existing rolling mills, the lubrication system and the current loading system are mostly set up as independent units. The lubrication side mainly adjusts the flow rate, pressure, and injection angle, while the current loading side mainly adjusts the voltage, current, and contact pressure. There is a lack of coordinated control between the two systems to address the conductivity of the lubricating medium, the conductive contact state, the local temperature rise, and the differences in the width direction.

[0004] The conductivity of lubricating media used in practice varies considerably. Some water-based or polar additive-containing lubricating media have a certain degree of conductivity and will participate in local current conduction after entering the conductive contact area. If the medium spreads too widely along the width of the strip or the running direction, it can easily generate bypass current, local overheating, electrolytic corrosion, or crosstalk between adjacent sections. Other oil-based or low-conductivity lubricating media, after entering the conductive contact area, may disrupt the original conductive contact state, causing fluctuations in contact resistance, and even resulting in unstable current flow and arcing.

[0005] The aforementioned problems are even more pronounced under conditions of wide strip, high-speed rolling, or ultra-thin strip rolling. The contact pressure, lubrication coverage, surface temperature, and flow conditions at different locations along the strip width are often inconsistent, making it difficult to promptly address local anomalies using integral loading or integral spraying. Therefore, a device is needed that can automatically select the current loading and lubrication matching method based on the conductivity of the lubricating medium, and can perform zoned detection and adjustment along the strip width. Summary of the Invention

[0006] The purpose of this invention is to provide a dual-condition current-loaded lubrication control device and method for strip rolling, in order to solve the problems of insufficient coordination between lubrication control and current loading in existing devices, poor compatibility of lubricating media with different conductivity, difficulty in constraining the bypass current of conductive lubricating media, contact resistance fluctuations caused by low conductivity lubricating media, and difficulty in timely handling of local anomalies in the width direction.

[0007] To achieve the above objectives, the present invention provides the following solution: a dual-condition current-loaded lubrication control device for strip rolling, comprising: The current loading assembly includes multiple current loading partition units arranged along the width direction of the strip, and each current loading partition unit is provided with a conductive contact element that contacts the strip. The lubrication spraying assembly includes a plurality of lubrication partition units arranged along the width direction of the strip, and the plurality of lubrication partition units are respectively arranged corresponding to the plurality of current loading partition units. Each lubrication partition unit is provided with a nozzle for spraying lubricating medium onto the strip. A lubrication condition switching unit is used to supply the nozzle with a conductive lubricating medium or a low-conductivity lubricating medium according to the conductivity of the currently used lubricating medium. The working condition adaptation mechanism is disposed between the current loading component and the lubrication injection component, and includes a confined flow guiding structure and an isolation structure. The confined flow guiding structure is used for conductive lubricating medium working conditions to form a confined flow channel between the strip and the nozzle. The isolation structure is used for low conductive lubricating medium working conditions to separate the lubricating medium from the conductive contact.

[0008] Preferably, it further includes a sensing and detection unit, which includes one or more of a contact resistance detection module, an infrared temperature sensor, a rolling force sensor, a lubrication status sensor, and a shunt current monitoring unit. The contact resistance detection module includes a voltage sampling terminal, a current sampling terminal, and a resistance calculation unit, which is used to calculate the conductive contact resistance based on the sampling voltage and current of the corresponding zone. The lubrication status sensor is used to detect one or more of the following: lubrication flow rate, lubrication pressure, liquid level, atomization state, or return state.

[0009] Preferably, the current loading partition unit includes a drive unit fixedly connected to the frame, the drive unit being used to adjust the contact pressure between the conductive contact and the strip; Electrical isolation is achieved between two adjacent current-loaded partition units through insulating isolators.

[0010] Preferably, the lubrication partition unit includes a flow rate adjustment unit and a spray angle adjustment unit, which are used to adjust the spray volume, spray direction and spray position of the lubricating medium sprayed from the corresponding nozzle.

[0011] Preferably, the confined flow guiding structure includes a flow guide plate, a side baffle, a slit guide, and an insulating liquid-blocking end face. The flow guide plate is disposed on the nozzle to limit the entry direction of the lubricating medium. The side baffle is fixedly connected below the flow guide plate to limit the lateral diffusion range of the lubricating medium along the width direction of the strip. The slit guide communicates with the nozzle to guide the conductive lubricating medium into the conductive contact area. The insulating liquid-blocking end face is fixedly connected to the side baffle and disposed close to the strip to block the diffusion of the conductive lubricating medium to non-target conductive areas.

[0012] Preferably, a confining gap is formed between the insulating liquid-resistant end face and the strip, the confining gap being 0.05 mm to 3.0 mm, and the width of the confining flow channel being no more than 1.2 times the width of the corresponding current-loaded partition unit.

[0013] Preferably, the isolation structure includes a dry contact isolator and a liquid-blocking isolator, wherein the dry contact isolator is located between the conductive contacts and nozzles adjacent to each other along the conveying direction of the strip.

[0014] Preferably, a non-contact gap is provided between the liquid-blocking isolation component and the surface of the strip, the non-contact gap being 0.1 mm to 2.0 mm, to block splashing droplets or backflow liquid from flowing to the conductive contact component; Along the conveying direction of the strip, the offset distance of the conductive contact relative to the nozzle is 5 mm to 80 mm.

[0015] Preferably, the lubrication condition switching unit includes a first lubricating medium storage unit, a second lubricating medium storage unit, a switching valve group, and a conductivity detection unit. The conductivity detection unit is used to detect the conductivity of the currently used lubricating medium. The switching valve group is connected between the first lubricating medium storage unit, the second lubricating medium storage unit, and the nozzle through a liquid supply passage, so as to realize the switching of the nozzle between the first lubricating medium supply passage and the second lubricating medium supply passage.

[0016] A method for dual-condition current-loaded lubrication control in strip rolling includes the following steps: The lubrication condition switching unit detects the current conductivity of the lubrication medium and selects between conductive lubrication medium condition, low conductivity lubrication medium condition, or maintains the current condition based on the conductivity detection result. When the working condition is a conductive lubricating medium, the conductive lubricating medium is guided to the conductive contact area through the confined flow guiding structure; When the lubricating medium has low conductivity, the conductive contact is separated from the spray lubrication area of ​​the nozzle by an isolation structure.

[0017] Compared with the prior art, the present invention has the following advantages and technical effects: 1. This invention, through a lubrication condition switching unit, can select different operating conditions according to the conductivity of the lubricating medium. The same device can be compatible with both conductive and low-conductivity lubricating media, reducing the need for redesigning the power supply method due to changes in the lubricating medium.

[0018] 2. Under the condition of conductive lubricating medium, the present invention provides a confined flow guiding structure that restricts the conductive lubricating medium to the inlet side or adjacent area of ​​the conductive contact area of ​​a single zone, thereby reducing the risks of bypass current, local overheating, electrolytic corrosion, and crosstalk between currents in adjacent zones.

[0019] 3. In the case of low-conductivity lubricating media, the isolation structure of this invention allows the conductive contact area to be misaligned and separated from the spray lubrication area, which helps to maintain the relatively dry contact state of the conductive contact area while retaining the spray lubrication effect.

[0020] 4. The current loading zone unit and the lubrication zone unit are arranged accordingly, which can realize independent adjustment of contact abnormality, temperature rise abnormality, current shunting abnormality or lubrication abnormality at different positions in the strip width direction. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of the current-loaded lubrication control device of the present invention; Figure 2 This is a partial structural diagram of the present invention under the condition of conductive lubricating medium; Figure 3 This is a partial structural schematic diagram of the present invention under low conductivity lubricating medium conditions. Figure 4 This is a cross-sectional schematic diagram of the confined flow guiding structure under the working conditions of the conductive lubricating medium of the present invention; Figure 5 This is a cross-sectional schematic diagram of the isolation structure and return structure under low conductivity lubricating medium conditions according to the present invention.

[0023] The components include: 1. Frame; 2. Strip transport channel; 3. Current loading assembly; 31. Current loading partition unit; 311. Conductive contact; 312. Drive unit; 313. Backplate; 314. Insulating isolation component; 315. Cooling channel; 4. Lubrication spray assembly; 41. Lubrication partition unit; 411. Nozzle; 412. Flow regulation unit; 413. Spray angle adjustment unit; 5. Lubrication condition switching unit; 51. First lubricating medium storage unit; 52. Second lubricating medium storage unit; 53. Switching valve group; 54. Conductivity detection unit; 55. Return fluid. Filtering unit; 56. Drainage branch; 6. Sensing and detection unit; 61. Contact resistance detection module; 62. Infrared temperature sensor; 63. Rolling force sensor; 64. Lubrication status sensor; 65. Shunt current monitoring unit; 7. Controller; 8. Power supply unit; 9. Working condition adaptation mechanism; 91. Limiting flow guiding structure; 911. Flow guide plate; 912. Side baffle; 913. Slit guide; 914. Insulating liquid-blocking end face; 92. Isolation structure; 921. Dry contact isolator; 922. Liquid-blocking isolator; 93. Liquid-blocking isolator structure; 94. Liquid return structure. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Example 1: Reference Figures 1-5 This invention provides a dual-condition current-loaded lubrication control device for strip rolling, comprising: The current loading assembly 3 includes a plurality of current loading partition units 31 arranged along the width direction of the strip, and a conductive contact 311 that contacts the strip is provided in the current loading partition unit 31. The lubrication spraying assembly 4 includes a plurality of lubrication partition units 41 arranged along the width direction of the strip. The plurality of lubrication partition units 41 are respectively arranged corresponding to a plurality of current loading partition units 31. The lubrication partition unit 41 is provided with a nozzle 411 for spraying lubricating medium onto the strip. The lubrication condition switching unit 5 is used to supply the nozzle 411 with a conductive lubricating medium or a low-conductivity lubricating medium according to the conductivity of the lubricating medium currently in use. The working condition adaptation mechanism 9 is disposed between the current loading assembly 3 and the lubrication injection assembly 4. It includes a confined flow guiding structure 91 and an isolation structure 92. The confined flow guiding structure 91 is used for conductive lubricating medium working conditions to form a confined flow channel between the strip and the nozzle 411. The isolation structure 92 is used for low conductive lubricating medium working conditions to separate the lubricating medium from the conductive contact 311.

[0027] The main function of the current loading component 3 is to apply current to the strip in sections along the width direction by using multiple current loading partition units 31 arranged along the strip width direction and their internal conductive contacts 311 to contact the strip. The main function of the lubrication spraying component 4 is to spray lubricating medium onto the strip by using multiple lubrication partition units 41 arranged along the strip width direction and their internal nozzles 411, and to cooperate with the corresponding current loading partition units 31 to achieve partitioned lubrication. The main function of the lubrication condition switching unit 5 is to adjust the lubrication condition according to the conductivity of the lubricating medium currently in use, and to switch the lubrication condition to the nozzles 411. 11. Selectively supplying conductive or low-conductivity lubricating media to meet lubrication requirements with different conductivity characteristics; the main function of the working condition adaptation mechanism 9 is to be located between the current loading assembly 3 and the lubrication spraying assembly 4. Through its included confined flow guiding structure 91 and isolation structure 92, it adapts to conductive lubricating media working conditions and low-conductivity lubricating media working conditions respectively. Under conductive lubricating media working conditions, a confined flow channel is formed between the strip and the nozzle 411 to constrain the distribution of conductive media. Under low-conductivity lubricating media working conditions, the lubricating media is separated from the conductive contact 311 to maintain a dry contact state. Overall, the present invention can be compatible with lubricating media with different conductivity, reduce the risk of bypass current, contact resistance fluctuations and local overheating caused by lubricating media, and improve the stability of current loading and lubrication control during strip rolling.

[0028] Further optimization of the scheme: the number of partitions of the current loading component 3 and the lubrication spraying component 4, that is, the number of current loading partition units 31 and lubrication partition units 41, is set according to the strip width, and the width of each partition can be 10 mm to 200 mm.

[0029] In this embodiment, the conductive lubricating medium condition is the condition in which the conductivity of the lubricating medium is not lower than the first preset threshold σ1, and the low conductive lubricating medium condition is the condition in which the conductivity of the lubricating medium is not higher than the second preset threshold σ2, and σ1 is greater than σ2.

[0030] The design was further optimized by installing a liquid-blocking baffle between adjacent lubrication zones. A small gap was formed between the lower end of the liquid-blocking baffle and the strip. The surface of the liquid-blocking baffle was made of insulating material.

[0031] Further optimization of the scheme also includes a sensing and detection unit 6, which includes one or more of the following: a contact resistance detection module 61, an infrared temperature sensor 62, a rolling force sensor 63, a lubrication status sensor 64, and a shunt current monitoring unit 65. The contact resistance detection module 61 includes a voltage sampling terminal, a current sampling terminal, and a resistance calculation unit, which is used to calculate the conductive contact resistance based on the sampling voltage and current of the corresponding zone. The lubrication status sensor 64 is used to detect one or more of the following: lubrication flow rate, lubrication pressure, liquid level, atomization state, or return state.

[0032] Further optimization of the scheme also includes controller 7 and power supply unit 8. Controller 7 is electrically connected to current loading component 3, lubrication injection component 4, lubrication condition switching unit 5, sensing and detection unit 6, and power supply unit 8, respectively, and is used to control the contact pressure, power supply parameters, injection parameters, and return fluid parameters of the corresponding zone according to the conductivity signal and the detection signals of each zone.

[0033] Further optimization of the scheme: the current loading partition unit 31 includes a drive unit 312 fixedly connected to the frame 1. The drive unit 312 is used to adjust the contact pressure between the conductive contact 311 and the strip. Electrical isolation is achieved between two adjacent current-loaded partition units 31 through an insulating isolator 314, reducing the impact of electrical coupling between partitions.

[0034] In a further optimized design, the drive unit 312 is one of an electric actuator, a pneumatic actuator, a piezoelectric actuator, or an electromagnetic actuator, and the drive unit 312 cooperates with the elastic preload to independently adjust the contact pressure of each zone conductive contact 311.

[0035] To further optimize the design, the current loading partition unit 31 also includes a back plate 313, which has a cooling channel 315 to reduce heat accumulation in the conductive contact area.

[0036] To further optimize the design, a strip running channel 2 is set inside the frame 1, and the current loading component 3 and the lubrication spraying component 4 are respectively set close to the strip running channel 2, which can be set above, below or on both sides of the strip transport path.

[0037] In a further optimized scheme, the power supply unit 8 forms a zoned current loop through the conductive contact 311 of each current loading zone unit 31 and its corresponding return conductive component. The return conductive component is one of the opposite conductive contact, conductive roller, outlet conductive component or conductive support component on the other side of the strip. The conductive contact 311, the return conductive component and the frame 1 are all provided with an insulation isolation path to reduce current leakage through the frame or non-target parts of the roll.

[0038] The scheme is further optimized so that the conductive contact 311 is one of the following: conductive roller, conductive slider, graphite conductive block, copper-graphite composite contact or elastic conductive brush, and the side in contact with the strip is provided with a rounded transition surface, a flexible conductive layer or a wear-resistant conductive coating.

[0039] Further optimization of the scheme: the lubrication partition unit 41 includes a flow rate adjustment unit 412 and a spray angle adjustment unit 413. The flow rate adjustment unit 412 and the spray angle adjustment unit 413 are used to adjust the spray volume, spray direction and spray position of the lubricating medium sprayed by the corresponding nozzle 411.

[0040] Further optimizing the design, the confined flow guiding structure 91 includes a guide plate 911, a side baffle 912, a slit guide 913, and an insulating liquid-blocking end face 914. The guide plate 911 is mounted on the nozzle 411 to limit the entry direction of the lubricating medium. The side baffle 912 is fixedly connected below the guide plate 911 to limit the lateral diffusion range of the lubricating medium along the width of the strip. The slit guide 913 communicates with the nozzle 411 to guide the conductive lubricating medium into the conductive contact area. The insulating liquid-blocking end face 914 is fixedly connected to the side baffle 912 and positioned close to the strip to block the diffusion of the conductive lubricating medium into non-target conductive areas. In summary, the confined flow guiding structure 91 allows the conductive lubricating medium to be distributed in a controlled manner only on the inlet side of the conductive contact area or in its vicinity.

[0041] The scheme is further optimized so that a confined gap is formed between the insulating liquid-resistant end face 914 and the strip, the confined gap is 0.05mm to 3.0mm, and the width of the confined flow channel is no more than 1.2 times the width of the corresponding current loading partition unit 31.

[0042] Further optimizing the scheme, the shunt current monitoring unit 65 includes one or more of the following components disposed in the confined flow guiding structure 91: a detection electrode, a sampling resistor, a Hall current detection module, or a current inductance detection module. This is used to detect the shunt current formed after the conductive lubricating medium participates in local flow guiding. If the shunt current in a certain zone exceeds a set upper limit, the controller 7 can reduce the injection flow rate of that zone, adjust the injection angle, reduce power supply parameters, or cut off the power supply to that zone. If the contact resistance increases while the shunt current is low, the controller 7 can increase the contact pressure of the conductive contact 311 in that zone.

[0043] The scheme is further optimized. The isolation structure 92 includes a dry contact isolation element 921 and a liquid blocking isolation element 922. The dry contact isolation element 921 is located between the adjacent conductive contact element 311 and nozzle 411 along the conveying direction of the strip.

[0044] The scheme is further optimized so that both the confining flow guiding structure 91 and the isolation structure 92 are fixedly connected to the frame 1, and multiple sets of lubrication spraying components 4 are respectively set to correspond to the confining flow guiding structure 91 and the isolation structure 92. Under different lubrication conditions, by switching different liquid supply paths, the lubrication spraying components 4 corresponding to the confining flow guiding structure 91 or the lubrication spraying components 4 corresponding to the isolation structure 92 are supplied with oil, thereby changing the spraying position and switching the lubrication conditions.

[0045] To further optimize the design, a liquid-blocking isolation structure 93 is also provided, which is located on the side of the isolation structure 92 near the nozzle 411. Its main function is to prevent splashing droplets or backflow liquid from entering the conductive contact area.

[0046] Further optimize the plan, such as Figure 3 As shown, a non-contact gap H is provided between the liquid-blocking isolation component 922 and the surface of the strip. The non-contact gap H is 0.1 mm to 2.0 mm and is used to block splashing droplets or backflow liquid from flowing to the conductive contact component 311. Along the conveying direction of the strip, the offset distance L between the conductive contact 311 and the nozzle 411 is 5 mm to 80 mm.

[0047] The scheme is further optimized. The lubrication condition switching unit 5 includes a first lubricating medium storage unit 51, a second lubricating medium storage unit 52, a switching valve group 53, and a conductivity detection unit 54. The conductivity detection unit 54 is used to detect the conductivity of the lubricating medium currently in use. The switching valve group 53 is connected between the first lubricating medium storage unit 51, the second lubricating medium storage unit 52, and the nozzle 411 through the liquid supply passage, so as to realize the switching of the nozzle 411 between the first lubricating medium liquid supply passage and the second lubricating medium liquid supply passage.

[0048] Further optimizing the scheme, the lubrication condition switching unit 5 also includes a return fluid filter unit 55 and a drain branch 56. The main function of the switching valve group 53 is to switch between the supply passage of conductive lubricating medium and the supply passage of low conductive lubricating medium. The main function of the drain branch 56 is to drain, isolate or recover the supply passage of the previous condition when the condition is switched.

[0049] The design is further optimized by installing a liquid return structure 94 on the frame 1. The liquid return structure 94 is located below the strip and its main function is to recover the lubricant and introduce it into the liquid return filter unit 55 under low conductivity lubricating medium conditions.

[0050] To further optimize the design, insulating connectors or insulating pipelines are installed between the nozzle 411, the liquid supply line, the liquid return structure 94 and the frame 1. An electrical isolation structure is installed between the return path of the conductive lubricating medium and the power supply unit 8 to prevent the lubricating medium from forming a non-target current path through the liquid supply line or the liquid return structure 94.

[0051] Further optimization of the scheme: The main function of the controller 7 is to select the conductive lubricating medium condition, the low conductive lubricating medium condition, or the current condition based on the conductivity signal output by the conductivity detection unit 54. When the conductivity is not lower than the first preset threshold σ1, it enters the conductive lubricating medium condition; when the conductivity is not higher than the second preset threshold σ2, it enters the low conductive lubricating medium condition; when the conductivity is between σ2 and σ1, the controller 7 maintains the current condition or executes the manually preset condition.

[0052] The scheme is further optimized. The power supply unit 8 includes a current limiting module, a leakage detection module, an abnormal power failure module, and an insulation monitoring module. When the shunt current, contact resistance, temperature, or insulation status of any zone exceeds the preset range, the controller 7 reduces the power supply parameters of that zone, shuts off the liquid supply to that zone, or cuts off the power supply to that zone.

[0053] Example 2: A method for dual-condition current-loaded lubrication control in strip rolling includes the following steps: The lubrication condition switching unit 5 detects the current conductivity of the lubrication medium and selects the conductive lubrication medium condition, the low conductivity lubrication medium condition, or maintains the current condition based on the conductivity detection result. When the working condition is a conductive lubricating medium, the conductive lubricating medium is guided to the conductive contact 311 area by the confined flow guiding structure 91; When the lubricating medium has low conductivity, the conductive contact 311 and the spray lubrication area of ​​the nozzle 411 are misaligned and separated by the isolation structure 92.

[0054] In this embodiment, a specific operation step includes: S1. The current conductivity of the lubricating medium is detected by the lubrication condition switching unit 5. The controller 7 selects the conductive lubricating medium condition, the low conductive lubricating medium condition, or maintains the current condition based on the conductivity detection result.

[0055] S2. When the working condition is a conductive lubricating medium, the first lubricating medium is guided to the conductive contact 311 through the confined flow guiding structure 91, that is, guided to the entrance side of the conductive contact area or its adjacent area, and its diffusion is restricted along the width direction and running direction of the strip. At the same time, the shunt current, contact resistance and temperature signals are monitored, and the contact pressure, power supply parameters and injection parameters of the corresponding zone are corrected.

[0056] S3. When the lubricating medium has low conductivity, the conductive contact area (i.e., the area where the strip contacts the conductive contact) and the sprayed lubrication area (i.e., the area where the sprayed lubricating medium is sprayed) are separated along the running direction of the strip by the isolation structure 92 and the liquid-blocking isolation structure 93. The lubricating fluid is recovered by the return structure 94. The contact pressure, spraying parameters and return parameters of the corresponding zone are adjusted according to the contact resistance, temperature and lubrication status signals.

[0057] S5. When a working condition change occurs, the controller 7 first closes the current liquid supply passage and opens the venting branch 56 to vent or recover the residual lubricating medium in the nozzle, liquid supply line and restricted flow channel. After the conductivity detection value reaches the target working condition threshold, the target lubricating medium is introduced through the switching valve group 53, and the contact pressure, power supply parameters, injection parameters and return parameters of the corresponding zone are restored.

[0058] To further optimize the design, when the strip head enters the equipment and establishes conductive contact, a low-conductivity lubricating medium should be prioritized to ensure the conductive contact area remains dry and stable. During the steady-state rolling stage, appropriate operating conditions can be selected based on material deformation requirements, temperature rise requirements, and the type of lubricating medium. When the strip tail passes through or the machine stops, the power supply parameters can be reduced, and the venting branch 56 and the return liquid structure 94 can be controlled to perform venting and return liquid operations to reduce residual liquid retention.

[0059] Example 3: In this embodiment, the controller 7 can handle abnormal states and achieve anomaly protection: Under conductive lubricating medium conditions, when the shunt current of a certain zone is greater than the set upper limit or the ratio of the shunt current to the main current is greater than the set ratio, the controller 7 will prioritize reducing the injection flow rate of that zone or adjusting the injection angle. If the shunt current still exceeds the set range, the controller will reduce the power supply parameters of that zone or cut off the power supply to that zone. When the contact resistance is higher than the set upper limit and the shunt current is lower than the set lower limit, the controller 7 will increase the contact pressure of the conductive contact 311 of that zone.

[0060] Under low-conductivity lubricating medium conditions, when the lubrication status sensor 64 detects abnormal return fluid, liquid overflow in the sprayed lubrication area, or liquid intrusion risk in the conductive contact area, the controller 7 reduces the spray flow rate, opens the venting branch 56, increases the return fluid suction volume, or cuts off the power supply to the corresponding zone.

[0061] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0062] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A dual-condition current-loaded lubrication control device for strip rolling, characterized in that, include: The current loading assembly (3) includes a plurality of current loading partition units (31) arranged along the width direction of the strip, and the current loading partition unit (31) is provided with a conductive contact (311) that contacts the strip. The lubrication spraying assembly (4) includes a plurality of lubrication partition units (41) arranged along the width direction of the strip. The plurality of lubrication partition units (41) are respectively arranged corresponding to the plurality of current loading partition units (31). The lubrication partition unit (41) is provided with a nozzle (411) for spraying lubricating medium onto the strip. The lubrication condition switching unit (5) is used to supply the nozzle (411) with a conductive lubricating medium or a low-conductivity lubricating medium according to the conductivity of the lubricating medium currently in use. The working condition adaptation mechanism (9) is disposed between the current loading assembly (3) and the lubrication injection assembly (4), and includes a confined flow guiding structure (91) and an isolation structure (92). The confined flow guiding structure (91) is used for conductive lubricating medium working conditions to form a confined flow channel between the strip and the nozzle (411). The isolation structure (92) is used for low conductive lubricating medium working conditions to separate the lubricating medium from the conductive contact (311).

2. The dual-condition current-loaded lubrication control device for strip rolling according to claim 1, characterized in that: It also includes a sensing and detection unit (6), which includes one or more of a contact resistance detection module (61), an infrared temperature sensor (62), a rolling force sensor (63), a lubrication status sensor (64), and a shunt current monitoring unit (65). The contact resistance detection module (61) includes a voltage sampling terminal, a current sampling terminal, and a resistance calculation unit, which is used to calculate the conductive contact resistance based on the sampling voltage and current of the corresponding partition. The lubrication status sensor (64) is used to detect one or more of the following: lubrication flow rate, lubrication pressure, liquid level, atomization state, or return state.

3. The dual-condition current-loaded lubrication control device for strip rolling according to claim 1, characterized in that: The current loading partition unit (31) includes a drive unit (312) fixedly connected to the frame (1), and the drive unit (312) is used to adjust the contact pressure between the conductive contact (311) and the strip. The two adjacent current-loaded partition units (31) are electrically isolated by an insulating isolator (314).

4. The dual-condition current-loaded lubrication control device for strip rolling according to claim 1, characterized in that: The lubrication partition unit (41) includes a flow rate adjustment unit (412) and a spray angle adjustment unit (413). The flow rate adjustment unit (412) and the spray angle adjustment unit (413) are used to adjust the spray volume, spray direction and spray position of the lubricating medium sprayed by the corresponding nozzle (411).

5. The dual-condition current-loaded lubrication control device for strip rolling according to claim 1, characterized in that: The confined flow guiding structure (91) includes a flow guide plate (911), a side baffle (912), a slit guide (913), and an insulating liquid-blocking end face (914). The flow guide plate (911) is disposed on the nozzle (411) to limit the direction of entry of the lubricating medium. The side baffle (912) is fixedly connected below the flow guide plate (911) to limit the lateral diffusion range of the lubricating medium along the width direction of the strip. The slit guide (913) is connected to the nozzle (411) to guide the conductive lubricating medium into the conductive contact area. The insulating liquid-blocking end face (914) is fixedly connected to the side baffle (912) and disposed close to the strip to block the diffusion of the conductive lubricating medium to non-target conductive areas.

6. The dual-condition current-loaded lubrication control device for strip rolling according to claim 5, characterized in that: The insulating liquid-resistant end face (914) forms a confined gap with the strip, the confined gap being 0.05 mm to 3.0 mm, and the width of the confined flow channel being no more than 1.2 times the width of the corresponding current-loaded partition unit (31).

7. The dual-condition current-loaded lubrication control device for strip rolling according to claim 1, characterized in that: The isolation structure (92) includes a dry contact isolator (921) and a liquid-blocking isolator (922), wherein the dry contact isolator (921) is located between the conductive contact (311) and the nozzle (411) adjacent to each other along the conveying direction of the strip.

8. The dual-condition current-loaded lubrication control device for strip rolling according to claim 7, characterized in that: A non-contact gap is provided between the liquid-blocking isolation component (922) and the surface of the strip, the non-contact gap being 0.1 mm to 2.0 mm, for blocking splashing droplets or backflow liquid from flowing to the conductive contact component (311). Along the conveying direction of the strip, the offset distance of the conductive contact (311) relative to the nozzle (411) is 5 mm to 80 mm.

9. The dual-condition current-loaded lubrication control device for strip rolling according to claim 1, characterized in that: The lubrication condition switching unit (5) includes a first lubricating medium storage unit (51), a second lubricating medium storage unit (52), a switching valve group (53), and a conductivity detection unit (54). The conductivity detection unit (54) is used to detect the conductivity of the lubricating medium currently in use. The switching valve group (53) is connected between the first lubricating medium storage unit (51), the second lubricating medium storage unit (52), and the nozzle (411) through a liquid supply passage, so as to realize the switching of the nozzle (411) between the first lubricating medium supply passage and the second lubricating medium supply passage.

10. A method for dual-condition current-loaded lubrication control in strip rolling, based on the dual-condition current-loaded lubrication control device for strip rolling as described in claim 1, characterized in that... Includes the following steps: The current conductivity of the lubricating medium is detected by the lubrication condition switching unit (5), and the conductive lubricating medium condition, low conductivity lubricating medium condition, or current condition is selected based on the conductivity detection result. When the working condition is a conductive lubricating medium, the conductive lubricating medium is guided to the conductive contact (311) area by the confined flow guiding structure (91); When the lubricating medium has low conductivity, the conductive contact (311) and the spray lubrication area of ​​the nozzle (411) are separated by the isolation structure (92).

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