A system and method for preventing and controlling roller marks on electroplated tin strip during stretching and straightening.

Abstract

This invention discloses a system and method for preventing roller marks on electroplated tin-plated strip during stretching and straightening. The system includes a vibration-free squeezing assembly, a drying assembly, a support roller assembly, and an inlet dynamic edge cleaning assembly, arranged sequentially along the strip conveying direction on the stretching and straightening machine frame and its front and rear areas. The support rollers employ an R50 arc transition at both ends to eliminate stress concentration at the roller ends. The squeezing assembly uses a ball-cage coupling with a precise 5mm gap to eliminate transmission vibration, and works in conjunction with drying to achieve complete surface drying. An inlet atomized ethanol device automatically sprays a 50mm area along the strip edge at the weld seam to remove edge impurities. The supporting processing method includes equipment debugging, surface squeezing and air drying, dynamic edge cleaning, and continuous stretching and straightening processes. This invention eradicates straightening roller marks from three dimensions: straightening roller structure, surface pretreatment, and edge impurity removal, reducing downtime for grinding and improving the quality and production efficiency of continuous straightening of metal strip. It is applicable to stretching and straightening production lines for tin-plated substrates, cold-rolled strip, and other metal sheets.

Description

Technical Field

[0001] This invention belongs to the field of metal plate processing technology, specifically relating to metal strip stretching and straightening equipment and process, and is particularly suitable for the strip stretching and straightening process in an electroplating tin production line. Background Technology

[0002] In the production of metal strip steel, tension straightening is a crucial step in improving the straightness of the strip and is widely used in cold-rolled strip steel production lines such as those for electroplating tin. In actual production, roll marks are easily generated on the strip surface during tension straightening, severely affecting product quality. Traditional methods typically involve stopping the machine to replace rolls or performing post-processing inspection and grinding, which significantly impacts production efficiency and fails to eliminate roll marks at their source.

[0003] Through long-term tracking and analysis, roller printing mainly originates from three interrelated but relatively independent factors: 1. An unreasonable design of the radius (R) angle of the support roller surface leads to concentrated compressive stress at the roller end, which, combined with long-term friction and wear, forms periodic roller marks.

[0004] 2. Vibration caused by roller misalignment and excessive coupling clearance in the pre-squeezing system of the straightening machine leads to uneven squeezing. Residual liquid on the strip surface (such as water after pickling or cleaning) not only causes slippage during high-speed stretching, but also impurities in the residual liquid form roller marks on the substrate surface after being rolled.

[0005] 3. Before entering the straightening machine, the edges of the strip are very prone to adsorbing impurities and foreign objects, which are then squeezed by the roller system after entering the straightening machine to form impurity-type roller marks.

[0006] Existing technologies often employ single methods, such as simply improving processing accuracy or simple wiping, but lack systematic solutions for the combined effects of the aforementioned multiple factors. Summary of the Invention

[0007] To address the aforementioned problems, this invention provides a system and method for preventing and controlling roller marks on electroplated tin strip during stretching and straightening. By systematically improving the processing steps and equipment structure before and after stretching and straightening, roller mark defects are eliminated, thereby improving the processing quality of the strip.

[0008] To achieve the above objectives, the present invention provides a strip steel stretching and straightening roller mark prevention and control system, comprising a vibration-free extrusion assembly, a drying assembly, a support roller assembly, and an inlet dynamic edge cleaning assembly arranged sequentially along the strip steel conveying direction in the frame and its front and rear areas, for preventing and controlling roller mark defects on the strip steel surface.

[0009] Optionally, the vibration-free squeezing assembly is installed in front of the feed end of the frame and includes a pair of squeezing rollers arranged symmetrically in opposite directions, a drive shaft, and a ball cage coupling. One end of the squeezing roller shaft is connected to the drive shaft, and the other end of the drive shaft is connected to a drive motor installed on the side of the frame through the ball cage coupling.

[0010] Optionally, the axial clearance between the ball cage coupling and the drive shaft is 5mm, and it is fixed by adjusting and locking with shims.

[0011] Optionally, the drying component is located behind the vibration-free extrusion component and is mounted above the front end of the frame for high-pressure secondary air drying of the extruded strip.

[0012] Optionally, the support roller assembly includes a plurality of support rollers that are symmetrically and rotatably connected inside the frame and in direct contact with the strip.

[0013] Optionally, the support roller has a 50-degree chamfer at both ends and an R50 rounded transition structure.

[0014] Optionally, a plurality of tension rollers are symmetrically and rotatably connected to both sides of the support roller assembly on the frame.

[0015] Optionally, the inlet dynamic edge purification assembly includes an anhydrous ethanol storage tank placed on the side of the frame, a high-pressure peristaltic pump, two sets of atomizing nozzles symmetrically arranged on the crossbeams of the frame on the strip drive side and the operating side, and a signal detection module installed on the crossbeam of the frame in front of the inlet pinch roller of the straightening machine. The anhydrous ethanol storage tank is connected to the inlet end of the high-pressure peristaltic pump through a hose, and the outlet end of the high-pressure peristaltic pump is connected to the two sets of atomizing nozzles through hoses respectively. The signal detection module is used to detect the strip weld signal and feed it back to the main PLC to control the start and stop of the high-pressure peristaltic pump.

[0016] Optionally, the atomizing nozzles are symmetrically arranged on both sides of the strip, and the atomized alcohol is sprayed in a fan shape, with the spraying area covering a width of 50mm on each side of the strip.

[0017] A method for controlling roller marks on electroplated tin strip during stretching and straightening includes the following steps: S1: Preliminary equipment debugging and installation: Replace the old-style support rollers in the tension leveler with optimized support rollers with rounded chamfers at both ends; adjust and lock the axial clearance between the ball cage coupling and the drive shaft; check the operation status of the squeeze rollers to ensure that they do not jump or vibrate; add anhydrous ethanol to the anhydrous ethanol storage tank; debug the inlet dynamic edge purification system to ensure that the weld signal can trigger the atomization spraying action normally; S2: Strip steel dewatering treatment: After the production line is started, the strip steel enters the vibration-free dewatering component, where the surface residual moisture is removed by the dewatering rollers rotating in opposite directions. The smooth operation of the dewatering rollers achieves uniform dewatering. After dewatering, the strip steel is then air-dried a second time by the drying component to make the surface of the strip steel completely dry. S3: Automatic cleaning and impurity removal at the edge of the strip: When the dried strip runs to the inlet of the straightening machine, the signal detection module detects the weld seam of the strip and starts the high-pressure peristaltic pump to pressurize and deliver anhydrous ethanol to the atomizing nozzle. The atomized alcohol is sprayed on both sides of the strip edge to dissolve and wash away the dust and particulate impurities attached to the edge. The alcohol evaporates quickly and leaves no residue. S4: Stretching and straightening operation: After the strip has been dewatered and cleaned, it enters the stretching and straightening operation. The optimized support rollers are evenly stressed at the ends, and with the clean and dry strip, roller marks are avoided throughout the process. S5: Continuous production cycle: Subsequent strip steels repeat steps S2 to S4 in sequence to achieve continuous and uninterrupted operation of the production line.

[0018] The beneficial effects of this invention are as follows: 1. This invention clarifies the three core causes of roller printing on tin plating straightening machines and proposes a three-in-one solution of "structural optimization + quantitative control + precise cleaning", which solves the technical bottleneck that existing technologies can only alleviate single types of roller printing. 2. This invention organically combines the increase of the support roller R angle with the optimization of the transition 50 degrees, the quantitative control of the 5mm coupling gap, and the directional atomized alcohol spraying device to form a customized improvement adapted to the tension leveling machine; 3. This invention applies alcohol atomization technology to the cleaning of strip steel edges. By utilizing the high volatility and solubility of alcohol, it solves the industry problem of difficult removal of impurities on the edges of high-speed strip steel, and has the significant advantages of high cleaning efficiency and no damage to the strip steel. The above methods form a closed-loop protection system: the support roller structure is optimized to reduce friction-type roller marks, the squeezing system is quantitatively controlled to block moisture-type roller marks, and the alcohol spraying device removes impurity-type roller marks. The three work together to achieve the complete elimination of roller mark defects. Attached Figure Description

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 This is a schematic diagram of the clearance between the ball cage coupling and the drive shaft.

[0022] Figure 3 This is a schematic diagram of the drying component.

[0023] Figure 4 This is a comparison chart of traditional support rollers and support roller R-angle optimization.

[0024] Figure 5 This is a schematic diagram of an alcohol atomizing spraying device.

[0025] Explanation of reference numerals in the attached figures 1. Frame; 11. Tensioning roller; 2. Vibrationless squeezing assembly; 21. Squeezing roller; 22. Drive shaft; 23. Ball cage coupling; 3. Drying assembly; 4. Support roller assembly; 41. Support roller; 5. Inlet dynamic edge purification assembly; 51. Anhydrous ethanol storage tank; 52. High-pressure peristaltic pump; 53. Atomizing nozzle; 54. Hose; 6. Strip steel. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] Reference Figure 1 A roll mark prevention system for electroplated tin strip stretching and straightening comprises four parts: a frame 1, a vibration-free extrusion assembly 2, a drying assembly 3, a support roller assembly 4, and an inlet dynamic edge purification assembly 5. It is used to eliminate roll marks on the strip 6. The arrows in the attached diagram indicate the running direction of the strip 6. The four components are arranged sequentially along the forward direction of the strip 6 in the frame 1 and its front and rear areas, cooperating and working together to prevent roll mark defects on the strip 6 from occurring from multiple dimensions.

[0028] Reference Figure 1-2 The vibration-free squeezing assembly 2 is installed in front of the feed end of the straightening machine frame 1 and consists of a pair of squeezing rollers 21 rotating in opposite directions, a drive shaft 22, and a ball cage coupling 23. The two squeezing rollers 21 are symmetrically arranged vertically at the front end of the frame 1, rotating in opposite directions. The strip passes through the gap between the rollers, and residual surface moisture is removed by the squeezing action of the roller surfaces. One end of the roller shaft of the squeezing roller 21 is connected to the drive shaft 22, and the other end of the drive shaft 22 is connected to a drive motor installed on the side of the frame 1 via the ball cage coupling 23, forming a power transmission chain of "motor—ball cage coupling 23—drive shaft 22—squeezing roller 21". The axial clearance between the ball cage coupling 23 and the drive shaft 22 is adjusted using standard shims and locked in place to ensure no jumping or offset during operation. During use, the axial clearance between the ball cage coupling and the drive shaft 22 is precisely controlled at 5mm. This is adjusted and locked in place using shims, while simultaneously correcting the installation accuracy of the roller system to prevent jumping or shifting of the squeeze roller 21 during operation. This reasonable clearance eliminates impact and vibration in the transmission structure, making the squeezing operation smoother and ensuring uniform and thorough removal of moisture from the strip 6 surface.

[0029] Reference Figure 1-3After being squeezed dry, the strip steel 6 immediately enters the drying assembly 3. The drying assembly 3 is set above the front end of the tension leveler frame 1. It uses high-pressure air to dry the surface of the strip steel 6 a second time, so that the surface of the strip steel 6 is completely dry, thus preventing the roll mark defects caused by residual moisture from the source.

[0030] Reference Figure 1-4 The support roller assembly 4 includes multiple support rollers 41, symmetrically and rotatably connected inside the frame 1 and in direct contact with the strip steel. It is the main source of friction-induced roller marks. Traditionally, the support rollers 41 have right-angled ends, resulting in concentrated stress at the ends during operation. Long-term friction and wear leave roller marks on the surface of the strip steel 6. This invention changes the right-angle transition at both ends of the support rollers 41 to a 50-degree chamfer, and optimizes this with an R50 circular arc transition, ensuring even stress distribution at the roller ends and solving the roller mark problem caused by stress concentration and roller wear.

[0031] Reference Figure 1 Multiple tension rollers 11 are rotatably connected to the frame 1 of the tension leveler. They are arranged sequentially along the running path of the strip 6 on the exit and inlet sides of the support roller assembly 4, and together with the support roller assembly 4, they form the tension straightening path of the strip 6. Each tension roller 11 is rotatably connected to the side plate of the frame 1 at both ends via bearing seats. The roller surface contacts the surface of the strip 6, and the strip tension is controlled by adjusting the wrap angle to ensure that the strip 6 enters the tension straightening area of ​​the support roller assembly 4 at a stable speed and tension.

[0032] Reference Figure 1 and Figure 5The inlet dynamic edge purification component 5 is installed between the drying component 3 and the main body of the tension leveler frame 1, mounted above both sides of the strip 6. It consists of an anhydrous ethanol storage tank 51, a high-pressure peristaltic pump 52, two sets of atomizing nozzles 53, and a signal detection module (not shown in the figure). The entire system is connected to the main PLC control system of the production line. The anhydrous ethanol storage tank 51 is placed on one side of the frame 1 and connected to the inlet end of the high-pressure peristaltic pump 52 via a hose 54. The outlet end of the high-pressure peristaltic pump 52 extends towards the strip 6 via a hose 54, connecting a set of atomizing nozzles 53 to both sides of the strip 6. The two sets of atomizing nozzles 53 are symmetrically arranged on the crossbeams of the frame 1 on the drive and operating sides of the strip 6, with the nozzles facing the edge of the strip 6 and the spray direction perpendicular to the running direction of the strip 6. The signal detection module is installed on the crossbeam of the frame 1 in front of the inlet pinch roller of the tension leveler, perpendicular to the running path of the strip 6, and is used to detect weld signals in real time and feed them back to the main PLC. When the weld seam of strip 6 is detected passing by, the main PLC controls the high-pressure peristaltic pump 52 to automatically start, drawing anhydrous ethanol from the anhydrous ethanol storage tank 51 and pressurizing it to be delivered to the atomizing nozzles 53 on both sides. The ethanol is then converted into fine droplets and sprayed in a fan shape onto the 50mm wide edge areas on both sides of strip 6. The ethanol quickly dissolves and washes away dust, particles, and other foreign matter adhering to the edges. Subsequently, due to its high volatility, it evaporates rapidly, leaving no residue on the surface of strip 6, effectively ensuring the cleanliness of the strip 6 edges.

[0033] The operating principle of this invention is as follows: The strip steel 6 first enters the vibration-free squeezing assembly 2 in front of the feed end of the straightening machine frame 1. The upper and lower squeezing rollers 21 rotate in opposite directions under the drive of the drive motor via the ball-cage coupling 23 and the transmission shaft 22, squeezing out the residual moisture from the surface of the strip steel 6. The squeezed-dry strip steel 6 then enters the drying assembly 3 mounted above the front end of the frame 1, where it undergoes secondary high-pressure air drying to completely dry its surface. After drying, the strip steel 6 continues to advance to the main entrance area of ​​the straightening machine frame 1. At this time, the signal detection module installed on the crossbeam of the frame 1 in front of the entrance pinch roller monitors the weld signal in real time. When the weld seam of the strip steel 6 head is detected passing by, the main PLC controls the high-pressure peristaltic pump 52 to automatically start, which is placed on the side of the frame 1... Anhydrous ethanol in the anhydrous ethanol storage tank 51 is drawn and pressurized through a hose 54, and then transported through the hose 54 to two sets of atomizing nozzles 53 symmetrically arranged above the drive side and the operating side of the strip 6. The nozzles spray in a fan shape on the 50mm wide edge areas on both sides of the strip 6, quickly dissolving and washing away dust, particles and other foreign matter attached to the edge, and then quickly evaporating without residue. Finally, the clean and dry strip 6 enters the frame 1 of the tension straightening machine and comes into contact with the support rollers 41, which are optimized with 50-degree chamfers and R50 arc transitions at both ends. After passing through multiple tension rollers 11, the roller ends are evenly stressed without stress concentration during the high-tension tension straightening process, thus avoiding the generation of three types of roller marks: friction type, water stain type and impurity type, and achieving comprehensive control of the surface quality of the strip 6.

[0034] A method for preventing and controlling roller marks on electroplated tin strip steel during stretching and straightening includes the following steps: S1: Preliminary Equipment Debugging and Installation Before formal production, the installation and debugging of the entire prevention and control system were completed: all the old-style support rollers 41 inside the straightening machine were replaced with optimized support rollers 41 with 50-degree chamfers at both ends; the ball cage coupling 23 of the front squeezing system was adjusted, shims were added, and the axial clearance between the ball cage coupling 23 and the drive shaft 22 was precisely adjusted to 5mm. After locking and fixing, the squeezing roller 21 was checked to ensure that there was no jumping or vibration during operation; the dynamic edge purification component 5 at the inlet of the straightening machine was checked, and sufficient anhydrous ethanol was added to the anhydrous ethanol storage tank 51. The signal detection module, high-pressure peristaltic pump 52 and atomizing nozzle 53 were tested to ensure that the weld signal could trigger the spraying function normally and that the nozzle atomization effect was normal.

[0035] S2: Strip steel 6 squeeze-drying and dewatering treatment After the tin plating production line starts up, the strip steel 6 first enters the vibration-free squeezing assembly 2. The upper and lower squeezing rollers 21 rotate in opposite directions, tightly adhering to the surface of the strip steel 6. Through squeezing action, all the residual moisture after pickling and washing of the strip steel 6 is squeezed out. Because the gap of the ball cage coupling 23 is controlled at 5mm, the squeezing rollers 21 operate smoothly and without vibration, and the moisture is evenly squeezed out from the entire surface of the strip steel 6. After squeezing, the strip steel 6 continues to be conveyed forward and enters the drying assembly 3, where it is dried again using high-pressure air to further ensure that the surface is completely dry.

[0036] S3: Automatic purification and impurity removal at 6 edges of the strip The completely dried strip steel 6 continues to advance. When the signal detection module detects the weld at the strip steel coil head, it immediately sends a start signal to the high-pressure peristaltic pump 52. The high-pressure peristaltic pump 52 starts working, pressurizing and delivering the anhydrous ethanol in the anhydrous ethanol storage tank 51 to the atomizing nozzles 53 on both sides. The atomizing nozzles 53 convert the alcohol into fine droplets and spray them symmetrically on the 50mm wide edge area on both sides of the strip steel 6. The alcohol quickly dissolves and washes away the dust, particles and other foreign matter adsorbed on the edge of the strip steel 6, and then evaporates rapidly, restoring the edge of the strip steel 6 to cleanliness, with no liquid residue on the surface.

[0037] S4: Straightening operation, completely avoiding roller marks. After being dried and cleaned, the strip steel is finally subjected to stretching and straightening operations.

[0038] The support roller 41 inside the tension straightener has been chamfered and optimized, and the roller end is evenly stressed. At this time, the surface of the strip 6 is dry and free of water, and the edges are free of impurities. With the support roller 41 with optimized structure, the strip 6 will not produce any type of roller mark defects during the entire process of high tension stretching and straightening.

[0039] S5: Continuous Circular Production After a single coil of strip steel 6 is processed, the next coil of strip steel 6 repeats the entire process of squeezing out water, cleaning the edges, and straightening.

[0040] Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A system for preventing and controlling roller marks on electroplated tin strip during stretching and straightening, characterized in that: It includes a vibration-free extrusion assembly (2), a drying assembly (3), a support roller assembly (4), and an inlet dynamic edge cleaning assembly (5) arranged sequentially along the conveying direction of the strip (6) on the frame (1) and in front and behind it, for preventing and controlling roller marks on the surface of the strip (6); The vibration-free squeezing assembly (2) is installed in front of the feed end of the frame (1) and includes a pair of squeezing rollers (21) arranged symmetrically in opposite directions, a drive shaft (22) and a ball cage coupling (23). One end of the roller shaft of the squeezing roller (21) is connected to the drive shaft (22), and the other end of the drive shaft (22) is connected to the drive motor installed on the side of the frame (1) through the ball cage coupling (23). The axial clearance between the ball cage coupling (23) and the drive shaft (22) is 5mm, and it is fixed by adjusting and locking with shims; The support roller assembly (4) includes multiple support rollers (41), which are symmetrically and rotatably connected inside the frame (1) and in direct contact with the strip steel; The support roller (41) has a 50-degree chamfer at both ends and an R50 arc transition structure; The inlet dynamic edge purification component (5) includes an anhydrous ethanol storage tank (51) placed on the side of the frame (1), a high-pressure peristaltic pump (52), two sets of atomizing nozzles (53) symmetrically arranged on the crossbeams of the frame (1) on the transmission side and the operation side of the strip (6), and a signal detection module installed on the crossbeam of the frame (1) in front of the inlet pinch roller of the straightening machine. The anhydrous ethanol storage tank (51) is connected to the inlet end of the high-pressure peristaltic pump (52) through a hose (54), and the outlet end of the high-pressure peristaltic pump (52) is connected to the two sets of atomizing nozzles (53) through a hose (54). The signal detection module is used to detect the weld signal of the strip (6) and feed it back to the main PLC to control the start and stop of the high-pressure peristaltic pump (52).

2. The anti-marking system for electroplated tin strip stretching and straightening rollers according to claim 1, characterized in that: The drying component (3) is located behind the vibration-free extrusion component (2) and is mounted above the front end of the frame (1) for high-pressure secondary air drying of the extruded strip.

3. The anti-marking system for electroplated tin strip stretching and straightening rollers according to claim 1, characterized in that: Multiple tension rollers (11) are symmetrically and rotatably connected to both sides of the support roller assembly (4) on the frame (1).

4. The anti-marking system for electroplated tin strip stretching and straightening rollers according to claim 1, characterized in that: The atomizing nozzles (53) are symmetrically arranged on both sides of the strip (6), and the atomized alcohol is sprayed in a fan shape, with a spray area of ​​50mm width on both sides of the strip.

5. A method for controlling roller marks on electroplated tin strip as described in any one of claims 1-4, characterized in that, Includes the following steps: S1: Preliminary equipment debugging and installation: Replace the old-style support roller (41) in the tension leveler with an optimized support roller (41) with rounded chamfers at both ends; adjust and lock the axial clearance between the ball cage coupling (23) and the drive shaft (22); check the running status of the squeeze roller (21) to ensure that it is free from jumping and vibration; add anhydrous ethanol to the anhydrous ethanol storage tank (51); debug the inlet dynamic edge purification system to ensure that the weld signal can trigger the atomization spraying action normally; S2: Strip steel dewatering treatment: After the production line is started, the strip steel (6) enters the vibration-free dewatering component (2), and the surface residual moisture is removed by the dewatering rollers (21) rotating in opposite directions. The dewatering rollers (21) running smoothly achieve uniform dewatering. The strip steel (6) after dewatering is then air-dried a second time by the drying component (3) to make the surface of the strip steel completely dry. S3: Automatic purification and impurity removal of strip edge: When the dried strip (6) runs to the entrance of the straightening machine, the signal detection module detects the weld of the strip (6) and starts the high-pressure peristaltic pump (52) to pressurize and deliver anhydrous ethanol to the atomizing nozzle (53). The atomized alcohol is sprayed on both sides of the strip (6) to dissolve and wash away the dust and particulate impurities attached to the edge. The alcohol evaporates quickly and leaves no residue. S4: Stretching and straightening operation: The strip steel (6) that has been dewatered and cleaned of impurities enters the stretching and straightening operation. The end of the support roller (41) with optimized structure is evenly stressed. Combined with the clean and dry strip steel (6), the roller marks are avoided throughout the process. S5: Continuous production cycle: Subsequent strip steel (6) repeats steps S2 to S4 in sequence to achieve continuous and uninterrupted operation of the production line.

Images