An on-line purging device for rolling liquid of a food-grade packaging cold-rolled substrate

Abstract

The application discloses a kind of food-grade packaging cold-rolled substrate rolling liquid online purging device, belongs to substrate rolling technical field, and its technical scheme main point is a kind of food-grade packaging cold-rolled substrate rolling liquid online purging device, including substrate upper purging structure, linkage structure and roll gap purging structure, substrate upper purging structure includes multiple substrate nozzles, substrate nozzle is slidably connected with conveying rack, the sliding direction of substrate nozzle is perpendicular to substrate surface, the air outlet end of substrate nozzle is close to substrate surface, roll gap purging structure includes multiple roll gap nozzles, multiple roll gap nozzles are slidably connected with roll, the sliding direction of roll gap nozzle is parallel to the length direction of roll, and the air outlet end of roll gap nozzle is close to the position of two rolls output substrate, linkage structure is respectively connected with substrate nozzle, roll gap nozzle is opposite for the movement of linkage substrate nozzle and roll gap nozzle, reach the effect that the distribution of rolling liquid on the substrate after purging is more uniform.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of substrate rolling, in particular to a kind of food-grade packaging cold-rolled substrate rolling liquid online blowing device. BACKGROUND

[0002] At present, with the diversification of commodities, different quality packaging materials emerge as the times require, and in the production of food-grade packaging, substrate is needed as material, and it is processed into the required shape;Metal substrate is often rolled into a specific thickness by rolling to meet production needs.

[0003] In the related art, the rolling mill is a commonly used machine for cold rolling of substrate, which includes a conveyor frame and two rollers, the two rollers are rotatably connected with the conveyor frame for rolling the substrate, and the rolling liquid needs to be sprayed on one side of the substrate entering the roller for lubrication, and the rolling liquid can also reduce the rust caused by the contact of the substrate with air, because there is a lot of rolling liquid left on the substrate and the roller after rolling, and the uneven rolling liquid left on the substrate will cause oil spots on the substrate, affecting the finished product effect, so a blowing device is needed to remove excess rolling liquid;The blowing device includes a support and a plurality of nozzles, the support is connected with the discharge end of the rolling mill, the plurality of nozzles are connected with the support, the nozzles are connected with the air compressor through a pipeline for continuously spraying gas, and the gas injection end faces the surface of the substrate, and the rolling liquid is blown by spraying gas on the substrate.

[0004] In view of the above-mentioned related art, due to the uneven distribution of rolling liquid on the substrate and the roller before blowing during rolling, the position of the nozzle is fixed, the blowing range is limited, and the blowing position is not easy to adjust when blowing different width substrates, so the blowing effect is poor, and the splashed rolling liquid after blowing is easy to fall back to the surface of the substrate, and there is the defect that the rolling liquid on the substrate after blowing is unevenly distributed. SUMMARY

[0005] In order to make the rolling liquid on the substrate after blowing more evenly distributed, the present application provides a kind of food-grade packaging cold-rolled substrate rolling liquid online blowing device.

[0006] The food-grade packaging cold-rolled substrate rolling liquid online blowing device provided by the present application adopts the following technical scheme:

[0007] The application discloses a kind of food-grade packaging cold-rolled substrate rolling liquid online blowing device, including substrate blowing structure, linkage structure and roll gap blowing structure, the substrate blowing structure includes multiple substrate nozzles, the substrate nozzle is located above the conveyer frame and is slidably connected with the conveyer frame, the sliding direction of the substrate nozzle is perpendicular to the substrate surface, the air outlet end of the substrate nozzle is close to the substrate surface, the roll gap blowing structure includes multiple roll gap nozzles, multiple roll gap nozzles are slidably connected with the roll, the sliding direction of the roll gap nozzle is parallel to the length direction of the roll, and the air outlet end of the roll gap nozzle is close to the position of the two rolls outputting substrate, the linkage structure is respectively connected with the substrate nozzle, the roll gap nozzle is used to link the movement of the substrate nozzle and the roll gap nozzle.

[0008] By using the above technical scheme, air is input from the substrate nozzle to the substrate nozzle, which can blow the surface of the substrate and remove excess rolling liquid on the surface of the substrate. The roll gap nozzle can blow the space between the rolls to reduce the residual rolling liquid on the side of the roll close to the discharge end. By sliding the substrate nozzle in a direction perpendicular to the substrate surface, the distance between the substrate nozzle and the substrate can be adjusted to adapt to substrates of different widths. The linkage assembly enables the substrate nozzle to slide while driving the roll gap nozzle to slide, changes the position of the roll gap nozzle to adapt to substrates of different widths, makes the whole blowing process more efficient, reduces resource waste caused by changes in substrate width, and improves the blowing effect to make the rolling liquid evenly distributed on the substrate.

[0009] Preferably, the substrate blowing structure includes sliding rods, mounting rods and limit pieces, the sliding rods are provided in multiple numbers, the sliding rods are respectively located on both sides of the conveyer frame and are slidably connected with the conveyer frame in a direction perpendicular to the substrate surface, the two ends of the mounting rod are fixedly connected with the ends of the sliding rods away from the conveyer frame, the length direction of the mounting rod is parallel to the length direction of the roll, the substrate nozzle is slidably connected with the mounting rod in the length direction of the mounting rod, and the limit piece is connected with the multiple substrate nozzles to limit the position of the substrate nozzle on the mounting rod.

[0010] By using the above technical scheme, the substrate nozzle can stably slide along the length direction of the mounting rod on the mounting rod, and the position is fixed under the action of the limit piece, so as to facilitate the worker to adjust the blowing range of the substrate nozzle, make it more flexible, and improve the utilization rate of the equipment. The sliding rod is slid to drive the mounting rod to move, which improves the stability of the mounting rod during movement.

[0011] Preferably, the substrate upper blowing structure further comprises a plurality of sliding blocks, the plurality of sliding blocks are fixedly connected with the substrate nozzles respectively, the plurality of sliding blocks pass through the mounting rods and are in sliding connection with the mounting rods, the limiting pieces are limiting screws, a plurality of limiting screws are provided, and the plurality of limiting screws are in threaded connection with the plurality of mounting rods respectively.

[0012] By adopting the above technical scheme, when the limiting screw passes through the sliding block and abuts against the mounting rod, the position of the substrate nozzle is fixed, so that the substrate surface is stably blown, and after the limiting screw and the mounting rod are connected, the substrate nozzle can slide along the length direction of the mounting rod, so that the staff can adjust the position of the substrate nozzle according to the width of the substrate, thereby adjusting the blowing range of the substrate nozzle, and the blowing effect is better.

[0013] Preferably, the linkage structure comprises a plurality of first blowing racks, a first blowing gear, a second blowing gear and a second blowing rack, the plurality of first blowing racks are fixedly connected with the mutually far apart sides of the sliding rods respectively, the first blowing gear meshing with the first blowing racks is located on the side of the first blowing racks away from the conveying rack, the second blowing gear rotates synchronously with the first blowing gear, the second blowing rack meshing with the second blowing gear is in sliding connection with the conveying rack in opposition, and the roll gap nozzle is fixedly connected with the second blowing rack in opposition.

[0014] By adopting the above technical scheme, the first blowing gear and the first blowing rack cooperate to enable the sliding rod to slide, and at the same time, the first blowing gear and the second blowing gear rotate synchronously, so that when the first blowing gear rotates, the second blowing gear rotates to drive the second blowing rack to slide along the length direction of the roll, thereby driving the roll gap nozzle to slide, linkage effect is realized that the roll gap nozzle can correspondingly slide when the substrate nozzle slides, the staff can quickly adjust the positions of the substrate nozzle and the roll gap nozzle according to the width of the substrate, and resource waste can be reduced in the process of uniformly blowing the rolling liquid.

[0015] Preferably, a linkage rod is connected between the first blowing gear and the second blowing gear, the linkage rod is fixedly connected with the shaft centers of the opposite sides of the first blowing gear and the second blowing gear respectively, and the first blowing gear is connected with a motor.

[0016] By adopting the above technical scheme, the first blowing gear and the second blowing gear rotate synchronously under the action of the linkage rod, so that the substrate nozzle and the roll gap nozzle are linked, the blowing effect is improved, driving resources are saved, and waste is reduced.

[0017] Preferably, a substrate lower blowing structure is connected below the conveying rack, and the substrate lower blowing structure has the same structure as the substrate upper blowing structure.

[0018] By adopting the above technical scheme, the substrate lower blowing structure can blow the lower surface of the substrate, reduce the rolling liquid residue on the lower surface, and further make the rolling liquid on the substrate surface more evenly distributed.

[0019] Preferably, the conveying frame is connected with a moving blowing structure away from one end of the roller, the moving blowing structure comprises a plurality of moving nozzles, and the plurality of moving nozzles are slidably connected with the conveying frame in the length direction of the roller.

[0020] By adopting the above technical scheme, the moving nozzles slide in the direction perpendicular to the direction of the roller, which can further blow the substrate surface, make the rolling liquid more evenly distributed, and reduce the missed area.

[0021] Preferably, the moving blowing structure further comprises a plurality of moving rods, a plurality of the moving nozzles are connected with one of the moving rods, the plurality of moving rods are respectively located above and below the conveying frame and are slidably connected with the conveying frame, and the moving directions of the moving nozzles on the adjacent two moving rods located on the same side are opposite.

[0022] By adopting the above technical scheme, the moving directions of the moving nozzles on the adjacent two moving rods located on the same side are opposite, which can make the rolling liquid on the substrate more evenly blown, reduce the missed area, and make the rolling liquid more evenly distributed on the substrate.

[0023] Preferably, the moving blowing structure comprises a support frame and a moving cylinder, the support frame is fixedly connected with the conveying frame, the support frame is provided with a groove for the moving rod to slide, the moving rod is slidably connected with the support frame, the support frame is fixedly connected with a synchronous rod, the synchronous rod is fixedly connected with a group of the moving rods located above and below the conveying frame, and the piston end of the moving cylinder is fixedly connected with the synchronous rod for simultaneously driving the moving rods on both sides to move.

[0024] By adopting the above technical scheme, the synchronous rod can simultaneously move the moving rods on both sides, save the driving energy, and will not reduce the work efficiency, so that the moving nozzles can effectively blow the substrate surface, blow off the excess rolling liquid, and make the rolling liquid more evenly distributed on the substrate.

[0025] In summary, the present application has the following beneficial effects:

[0026] 1. The substrate nozzle blows the surface of the substrate, and the roll gap nozzle blows the gap between the rolls to remove residual rolling fluid from the substrate surface and the rolls, making the rolling fluid more evenly distributed on the substrate. At the same time, the linkage structure allows the substrate nozzle and the roll gap nozzle to adjust their positions simultaneously to adapt to substrates of different widths. This not only maintains a good blowing effect but also improves the gas utilization rate, achieving the effect of saving resources.

[0027] 2. The substrate nozzle moves along the length of the mounting rod, which makes it easier for the operator to adjust the position of the substrate nozzle according to the width of the substrate, improves the flexibility of the substrate nozzle, and allows the rolling fluid to be blown more evenly.

[0028] 3. Moving nozzles on adjacent mounting rods blow the substrate further in opposite directions, which can improve the blowing effect and remove residual rolling liquid from the substrate. Attached Figure Description

[0029] Figure 1 This is a structural schematic diagram of an embodiment of this application.

[0030] Figure 2 This is a schematic diagram of a partial structure of the linkage rod, as shown in the embodiments of this application.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Conveyor frame; 11. Fixed frame; 12. Moving track; 2. Roller; 3. On-substrate blowing structure; 31. Sliding rod; 32. Mounting rod; 33. Sliding block; 34. Substrate nozzle; 35. Limiting screw; 4. Linkage structure; 41. First blowing rack; 42. First blowing gear; 421. Linkage rod; 43. Second blowing gear; 44. Second blowing rack; 5. Roll gap blowing structure; 51. Connecting rod; 52. Blowing frame; 53. Roll gap nozzle; 6. On-substrate blowing structure; 7. Moving blowing structure; 71. Support frame; 711. Synchronizing rod; 72. Moving rod; 73. Moving nozzle; 74. Moving cylinder. Detailed Implementation

[0033] The present invention will be further described in detail below with reference to the accompanying drawings.

[0034] An online purging device for the rolling solution of cold-rolled substrate for food-grade packaging, such as... Figure 1As shown, the system comprises a substrate upper blowing structure 3, a linkage structure 4, a roll gap blowing structure 5, a substrate lower blowing structure 6 and a moving blowing structure 7. The substrate upper blowing structure 3 is connected with the conveying frame 1 to blow the upper surface of the substrate. The linkage structure 4 is connected with the substrate upper blowing structure 3, the roll gap blowing structure 5 and the substrate lower blowing structure 6 respectively. The substrate lower blowing structure 6 is connected with the conveying frame 1 to blow the lower surface of the substrate. The moving blowing structure 7 is connected with the conveying frame 1 to further blow the substrate.

[0035] As shown in Figure 1 The substrate upper blowing structure 3 comprises sliding rods 31, mounting rods 32, sliding blocks 33, substrate nozzles 34 and limiters. The sliding rods 31 are vertical rod structures. Two sliding rods 31 are fixedly connected with square fixed frames 11 near the two sides of the conveying frame 1 in the length direction of the conveying frame 1. The two sliding rods 31 are respectively connected with the fixed frames 11 in the direction perpendicular to the surface of the substrate. The two ends of the two sliding rods 31 far from the conveying frame 1 are fixedly connected with the two ends of the mounting rods 32. The mounting rods 32 are horizontal rod structures, and the length direction of the mounting rods 32 is parallel to the length direction of the roll 2.

[0036] As shown in Figure 1 The sliding blocks 33 are provided in plurality, and the sliding blocks 33 are slidably connected with the mounting rods 32. The sliding blocks 33 are cuboid structures provided with sliding grooves. The width of the sliding grooves is matched with the width of the mounting rods 32, so that the sliding blocks 33 can slide along the length direction of the mounting rods 32. The substrate nozzles 34 pass through the side of the sliding blocks 33 far from the mounting rods 32 and are fixedly connected with the sliding blocks 33, so that the substrate nozzles 34 can slide along the length direction of the mounting rods 32, and the position of the substrate nozzles 34 can be adjusted according to the width of the substrate by the staff. The limiters can be elastic clamps fixedly connected with the sliding blocks 33 and clamped with the mounting rods 32, or can be limit screws 35. The top surface of each sliding block 33 is provided with a threaded hole for the limit screw 35 to extend into, so that the limit screw 35 is threadedly connected with the sliding block 33.

[0037] In use, the staff slides the sliding blocks 33 to the appropriate positions according to the use needs, rotates the limit screws 35 to abut the limit screws 35 with the mounting rods 32, fixes the positions of the sliding blocks 33 and the substrate nozzles 34, and opens the substrate nozzles 34 to blow the upper surface of the substrate.

[0038] As shown in Figure 1As shown, the linkage structure 4 includes a first purge rack 41, a first purge gear 42, a second purge gear 43 and a second purge rack 44. The vertical first purge rack 41 is provided with two, and the two first purge racks 41 are respectively located at the ends of the two sliding rods 31 away from each other and are fixedly connected with the sliding rods 31. The first purge gear 42 engaged with the first purge rack 41 is rotatably connected with the fixed frame 11 through a horizontal rod structure. The fixed frame 11 is provided with a groove on the side close to the first purge rack 41 for the engagement of the first purge rack 41 and the first purge gear 42. The first purge gear 42 is connected with a motor (not shown in the figure). When the motor is started, the sliding rod 31 can move in a direction perpendicular to the surface of the base plate under the cooperation of the first purge gear 42 and the first purge rack 41.

[0039] As shown in Figure 2 The second purge gear 43 is located between the first purge gear 42 and the roller 2 and rotates synchronously with the first purge gear 42. The side of the first purge gear 42 away from the motor is connected with a horizontal linkage rod 421. The length direction of the linkage rod 421 is parallel to the discharging direction. The two ends of the linkage rod 421 are respectively fixedly connected with the opposite sides of the first purge gear 42 and the second purge gear 43, and the linkage rod 421, the first purge gear 42 and the second purge gear 43 are coaxial. The horizontal second purge rack 44 is provided with two. The top surface of the conveyor frame 1 is fixedly connected with two moving rails 12 for the sliding of the second purge rack 44. The length direction of the moving rail 12 is parallel to the length direction of the roller 2. The second purge rack 44 is slidingly connected with the moving rail 12 and engaged with the second purge gear 43. When the first purge gear 42 drives the sliding rod 31 to slide, the second purge rack 44 slides under the action of the second purge gear 43.

[0040] As shown in Figure 2 The roller gap purge structure 5 includes a connecting rod 51, a purge frame 52 and a roller gap nozzle 53. One end of the connecting rod 51 is fixedly connected with the second purge rack 44, and the other end is fixedly connected with the purge frame 52. The roller gap nozzle 53 is fixedly connected with the purge frame 52, so that the second purge rack 44 can drive the roller gap nozzle 53 to slide synchronously when the second purge rack 44 slides along the length direction of the roller 2. The gas outlet end of the roller gap nozzle 53 is close to the two sides of the base plate between the two rollers 2, so that the rolling liquid on the rollers 2 and the rolled base plate can be uniformly purged.

[0041] When in use, the motor is started to drive the first blowing gear 42 to cooperate with the first blowing rack 41, drive the sliding rod 31 to move away from the conveyor frame 1, increase the blowing range of the substrate nozzle 34, and meanwhile, the second blowing gear 43 cooperates with the second blowing rack 44 to drive the roller gap nozzles 53 on both sides to move away from each other to adapt to a wider substrate, when the width of the produced substrate becomes narrower, the motor is reversed to drive the first gear to rotate reversely to readjust the positions of the substrate nozzle 34 and the roller gap nozzle 53, keep good blowing effect, and meanwhile, resource waste is avoided.

[0042] As shown in Figure 1 The substrate lower blowing structure 6 is the same as the substrate upper blowing structure 3 in structure, is located below the conveyor frame 1 and is used for blowing the lower surface of the substrate, the first blowing rack 41 included in the substrate lower blowing structure 6 is engaged with the first blowing gear 42 included in the substrate upper blowing structure 3 for saving driving energy, and the substrate nozzle 34 included in the substrate lower blowing structure 6 and the substrate nozzle 34 included in the substrate upper blowing structure 3 slide away from or close to each other at the same time.

[0043] As shown in Figure 1 The moving blowing structure 7 includes a support frame 71, a moving rod 72, a moving nozzle 73 and a moving cylinder 74, the length direction of the support frame 71 is parallel to the length direction of the roller 2, a group of support frames 71 are provided with two, the two support frames 71 are fixedly connected with the top surface and the bottom surface of the conveyor frame 1 respectively, a plurality of groups of support frames 71 are evenly arranged along the length direction of the conveyor frame 1, and each group of support frames 71 is located on the side of the sliding rod 31 away from the roller 2; the moving rod 72 is a horizontal rod structure, the length direction of the moving rod 72 is parallel to the discharging direction, a groove is formed in the support frame 71 for sliding connection of the moving rod 72, the two ends of the moving rod 72 are located in the groove and are slidingly connected with the support frame 71, the moving nozzle 73 is provided with a plurality of moving nozzles 73, the plurality of moving nozzles 73 are fixedly connected with the moving rod 72 and are evenly arranged along the length direction of the moving rod 72, and are used for further blowing the surface of the substrate.

[0044] As shown in Figure 1 One end of the length direction of the support frame 71 is fixedly connected with a C-shaped synchronous rod 711, the same side of the two horizontal sections of the synchronous rod 711 is fixedly connected with the moving rod 72 slidingly arranged in the two support frames 71 of the same group, the two ends of the two horizontal sections away from the support frame 71 are fixedly connected with the vertical section, the piston end of the moving cylinder 74 is fixedly connected with the vertical section of the synchronous rod 711 for sliding the moving rod 72 and driving the moving nozzle 73 to slide, and the moving directions of the moving nozzles 73 connected with the two groups of adjacent support frames 71 are opposite, so that the blowing is more uniform.

[0045] The use process of the present application is as follows:

[0046] In use, the motor is started, the distance between the substrate nozzle 34 and the conveying frame 1 is adjusted according to the width of the substrate, the roller gap nozzle 53 is correspondingly adjusted to the appropriate position under the action of the first blowing gear 42, the first blowing rack 41, the second blowing gear 43 and the second blowing rack 44, the sliding block 33 is moved to slide the substrate nozzle 34 on the mounting rod 32 to the position suitable for blowing the substrate, the limiting screw 35 is screwed to abut against the mounting rod 32, so as to fix the position of the sliding block 33 and the substrate nozzle 34, the air compressor and the moving cylinder 74 are started to make the gas enter into the substrate nozzle 34, the roller gap nozzle 53 and the moving nozzle 73 respectively, and the surface of the substrate and the gap between the rolls 2 are blown respectively, so that the distribution of the rolling liquid on the blown substrate is more uniform.

[0047] The embodiments of the present specific implementation are the preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, so that: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. An online purging device for the rolling solution of cold-rolled substrate for food-grade packaging, characterized in that: The system includes a substrate blowing structure (3), a linkage structure (4), and a roll gap blowing structure (5). The substrate blowing structure (3) includes multiple substrate nozzles (34). The substrate nozzles (34) are located above the conveyor frame (1) and are slidably connected to the conveyor frame (1). The sliding direction of the substrate nozzles (34) is perpendicular to the substrate surface. The air outlet of the substrate nozzles (34) is close to the substrate surface. The roll gap blowing structure (5) includes multiple roll gap nozzles (53). The multiple roll gap nozzles (53) are slidably connected to the rolls (2). The sliding direction of the roll gap nozzles (53) is parallel to the length direction of the rolls (2). The air outlet of the roll gap nozzles (53) is close to the position where the two rolls (2) output the substrate. The linkage structure (4) is connected to the substrate nozzles (34) and the roll gap nozzles (53) respectively to link the movement of the substrate nozzles (34) and the roll gap nozzles (53). The substrate blowing structure (3) includes a sliding rod (31), a mounting rod (32), and a limiting member. Multiple sliding rods (31) are provided, and the multiple sliding rods (31) are respectively located on both sides of the conveyor frame (1) and are slidably connected to the conveyor frame (1) in a direction perpendicular to the surface of the substrate. The two ends of the mounting rod (32) are respectively fixedly connected to the end of the sliding rod (31) away from the conveyor frame (1). The length direction of the mounting rod (32) is parallel to the length direction of the roller (2). The substrate nozzle (34) is slidably connected to the mounting rod (32) in a direction along the length direction of the mounting rod (32). The limiting member is connected to the multiple substrate nozzles (34) to limit the position of the substrate nozzles (34) on the mounting rod (32). The substrate blowing structure (3) further includes multiple sliding blocks (33), which are fixedly connected to the substrate nozzle (34) respectively, and the multiple sliding blocks (33) pass through the mounting rod (32) and are slidably connected to the mounting rod (32). The limiting member is a limiting screw (35), and multiple limiting screws (35) are provided. The multiple limiting screws (35) are threadedly connected to the multiple mounting rods (32) respectively. The linkage structure (4) includes multiple first purge racks (41), a first purge gear (42), a second purge gear (43), and a second purge rack (44). The multiple first purge racks (41) are fixedly connected to the sides of the sliding rod (31) that are far away from each other. The first purge gear (42) that meshes with the first purge rack (41) is located on the side of the first purge rack (41) that is far away from the conveyor frame (1). The second purge gear (43) rotates synchronously with the first purge gear (42). The second purge rack (44) that meshes with the second purge gear (43) is slidably connected to the conveyor frame (1). The roll gap nozzle (53) is fixedly connected to the second purge rack (44). A linkage rod (421) is connected between the first purge gear (42) and the second purge gear (43). The linkage rod (421) is fixedly connected to the shaft center of the opposite side of the first purge gear (42) and the second purge gear (43), respectively. The first purge gear (42) is connected to the motor. The roll gap blowing structure (5) also includes a connecting rod (51) and a blowing frame (52). One end of the connecting rod (51) is fixedly connected to the second blowing rack (44), and the other end is fixedly connected to the blowing frame (52). The roll gap nozzle (53) is fixedly connected to the blowing frame (52), so that when the second blowing rack (44) slides along the length direction of the roll 2, it can drive the roll gap nozzle (53) to slide synchronously. The underside of the conveyor frame (1) is connected to a substrate under-purge structure (6), which has the same structure as the substrate top-purge structure (3).

2. The online purging device for the rolling solution of cold-rolled substrate for food-grade packaging according to claim 1, characterized in that: A movable blowing structure (7) is connected to one end of the conveyor frame (1) away from the roll (2). The movable blowing structure (7) includes a movable nozzle (73). Multiple movable nozzles (73) are provided. The multiple movable nozzles (73) are slidably connected to the conveyor frame (1) along the length direction of the roll (2).

3. The online purging device for the rolling solution of cold-rolled substrate for food-grade packaging according to claim 2, characterized in that: The movable purging structure (7) also includes multiple movable rods (72), with multiple movable nozzles (73) connected to each movable rod (72). The multiple movable rods (72) are located above and below the conveyor frame (1) respectively and are slidably connected to the conveyor frame (1). The movable nozzles (73) on two adjacent movable rods (72) on the same side move in opposite directions.

4. The online purging device for the rolling solution of cold-rolled substrate for food-grade packaging according to claim 3, characterized in that: The movable purging structure (7) includes a support frame (71) and a movable cylinder (74). The support frame (71) is fixedly connected to the conveyor frame (1). The support frame (71) has a groove for the movable rod (72) to slide. The movable rod (72) is slidably connected to the support frame (71). A synchronizing rod (711) is fixedly connected to the support frame (71). The synchronizing rod (711) is fixedly connected to a set of movable rods (72) located above and below the conveyor frame (1). The piston end of the movable cylinder (74) is fixedly connected to the synchronizing rod (711) to simultaneously drive the movable rods (72) on both sides to move.

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