Surface pretreatment system and pickling method based on cold-rolled steel strip

Abstract

The application discloses a surface pretreatment system based on cold-rolled strip steel and a pickling method, and relates to the technical field of cold-rolled strip steel processing, in particular to a surface pretreatment system based on cold-rolled strip steel, which comprises a pickling tank and a cold-rolled strip steel, an actuating mechanism is arranged on the pickling tank and is used for controlling vibration of the cold-rolled strip steel during pickling, a limiting mechanism is arranged on the pickling tank and is used for guiding the cold-rolled strip steel during conveying and pickling, and the actuating mechanism comprises a vibration assembly, the vibration assembly comprises a fixed frame fixed on the top of the pickling tank, guide rods fixed on both sides of the top of the fixed frame, a floating frame installed on the fixed frame in a sliding mode in the longitudinal direction through the guide rods on both sides, a stand fixed in the middle of the top of the fixed frame and penetrating through the floating frame, and a motor installed at the rear end of the stand. The cold-rolled strip steel is slightly vibrated through the pressing roller, the contact and mixing of the acid liquid and the surface of the cold-rolled strip steel can be accelerated, the chemical reaction is more sufficient, and thus the decomposition of impurities is promoted.

Description

Technical Field

[0001] This invention relates to the field of cold-rolled strip steel processing technology, specifically to a surface pretreatment system and pickling method based on cold-rolled strip steel. Background Technology

[0002] The surface of steel strip may contain unevenly distributed oxide scale, rust, and other contaminants. During the production, storage, and transportation of steel strip, these impurities often form deposits of varying degrees and forms due to the influence of various factors such as environment, temperature, and humidity.

[0003] Pickling is an important process in the production of cold-rolled strip steel. Its purpose is to remove oxide scale, rust and other contaminants from the surface of the strip steel, so as to provide qualified billets for the rolling mill and enable the cold rolling mill to produce qualified strip steel products smoothly.

[0004] According to CN216404545U, a closed-loop pickling tank for a cold-rolled strip steel pickling production line is disclosed. This technology discloses "a closed-loop pickling tank for a cold-rolled strip steel pickling production line, including a base, winding boxes fixed to both ends of the upper surface of the base, and a processing box fixed to the middle of the upper surface of the base. The processing box has a processing chamber in the middle, and drying chambers connected to it on both sides. A hot air blower is connected to the top of the drying chamber, and an exhaust pipe is installed at the bottom of the drying chamber. The exhaust pipe is connected to a ventilation chamber opened in the base. Two sealed chambers are symmetrically opened in the base about the ventilation chamber. Ventilation windows connected to the outside are installed on the sides of the sealed chambers. A neutralization tank is installed inside the sealed chambers, and exhaust pipes are connected to both sides of the ventilation chambers." This technology has the technical advantages of "rapid drying via a hot air blower, preventing dust from adhering to the surface of the cold-rolled strip steel before and after pickling, thus improving pickling efficiency and effect."

[0005] After pretreatment, cold-rolled strip steel needs to undergo immersion pickling. Although this can remove impurities to some extent, due to the limitations of the contact method and time between the pickling solution and the strip steel surface, it is often difficult to ensure that all areas are treated sufficiently and uniformly. Furthermore, substances decomposed during the pickling process can easily re-adhere to the surface of the cold-rolled strip steel, which may lead to inconsistent surface quality of the cold-rolled strip steel after pickling. Some areas may still have residual oxide scale, rust, and other impurities, thus affecting the subsequent processing performance of the strip steel and the quality of the final product. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a surface pretreatment system and pickling method based on cold-rolled strip steel. This system features a method that uses pressure rollers to apply small-amplitude vibrations to the cold-rolled strip steel, accelerating the contact and mixing of the acid solution with the surface of the cold-rolled strip steel, resulting in a more complete chemical reaction and promoting the decomposition of impurities. Furthermore, the vibrations also cause the decomposed substances on the surface of the cold-rolled strip steel to detach and settle to the bottom of the pickling tank under gravity, preventing the decomposed substances from re-adhering to the surface of the cold-rolled strip steel and affecting the pickling effect.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a surface pretreatment system based on cold-rolled strip steel, comprising a pickling tank and cold-rolled strip steel, wherein an actuator is provided on the pickling tank for controlling the vibration of the cold-rolled strip steel during the pickling process, and a limit mechanism is provided on the pickling tank for guiding the cold-rolled strip steel during conveying and pickling. The actuator includes:

[0008] The vibration assembly includes a fixed frame fixed to the top of the pickling tank, guide rods fixed on both sides of the top of the fixed frame, a floating frame that is longitudinally slidably installed above the fixed frame via the guide rods on both sides, a vertical frame fixed in the middle of the top of the fixed frame and extending through the floating frame, a motor installed at the rear end of the vertical frame, a round seat fixed at the output end of the motor, a slider slidably installed inside the round seat, an eccentric circle fixed at the front end of the slider, and a connecting rod pivotally connected to the outer edge of one side of the front end of the eccentric circle, with the lower end of the connecting rod pivotally connected to the upper end of the floating frame.

[0009] The positioning assembly includes a bearing fixed on both sides of the top of the floating frame, a support rod hinged to the front end of the bearing, a shaft bracket fixed between the lower ends of the two support rods, shaft blocks slidably installed inside both ends of the shaft bracket, and a pressure roller rotatably installed between the two shaft blocks.

[0010] Auxiliary components include a mounting base that is fixed to the rear end of the bottom of the bracket.

[0011] Preferably, the vibration assembly further includes a lead screw rotatably mounted inside the round seat, and the lead screw is threadedly mounted to the slider, with internal hexagonal holes opened at both ends of the lead screw.

[0012] Preferably, the positioning component further includes a first electric push rod pivotally connected to the upper end of the bearing seat, and the output end of the first electric push rod is pivotally connected to the upper end of the support rod.

[0013] Preferably, the position assembly further includes a limiting sleeve rotatably mounted on the outer wall of the support rod, a push rod rotatably mounted on the outer wall of the shaft block and slidably mounted through the limiting sleeve, a second electric push rod mounted on the outer wall of the limiting sleeve, and a pressure sensor mounted on the output end of the second electric push rod.

[0014] Preferably, the auxiliary component further includes a scraper that is slidably mounted through the rear end of the mounting base, and several springs mounted inside the rear end of the mounting base.

[0015] Preferably, the limiting mechanism includes:

[0016] The main components include mounting plates fixed to the outer walls of both ends of the pickling tank, several uprights that are horizontally slidably installed on the outer wall of the mounting plates, and protrusions installed in the middle of the outer wall of the uprights.

[0017] The limiting component includes a limiting frame fixed to the upper end of the upright and a slot opened on the limiting frame.

[0018] Preferably, the main component further includes a guide plate that is longitudinally slidably mounted on the mounting plate, a plurality of guide grooves opened inside the guide plate, and protrusions located inside the corresponding guide grooves, and a third electric push rod pivotally connected to both ends of the outer wall of the mounting plate, and the output end of the third electric push rod is pivotally connected to the guide plate.

[0019] Preferably, upper guide rollers are rotatably installed at both the front and rear ends of the top of the pickling tank, and lower guide rollers are rotatably installed at both the front and rear ends of the lower interior of the pickling tank. The upper and lower ends of the limiting frame are respectively sleeved and slidably installed on the upper and lower guide rollers.

[0020] This invention also discloses a pickling method based on a surface pretreatment system for cold-rolled strip steel, comprising the following steps:

[0021] S1: First, the cold-rolled strip steel is conveyed during the feeding process by the upper and lower guide rollers at both ends, so that the pickling tank can pickle the cold-rolled strip steel; then, the output end of the third electric push rod drives the guide plate to move upward, and the guide plate drives the upright to move laterally along the mounting plate through the guide groove and the protrusion. The upright drives the limit frame to slide laterally along the upper and lower guide rollers, so that the adjacent limit frames limit the cold-rolled strip steel between them.

[0022] S2: Next, the output end of the first electric push rod drives the support rod to rotate. When the support rod drives the pressure roller on the shaft frame to contact the cold-rolled strip, the reverse force of the cold-rolled strip pushes the pressure roller to drive the shaft block to slide along the inside of the shaft frame. At the same time, the shaft block drives the push rod to move upward along the inside of the limit sleeve, so that the upper end of the push rod contacts the pressure sensor, thereby stopping the drive of the first electric push rod and determining the position of the pressure roller. Then, the second electric push rod drives the pressure sensor to rise and disengage from the upper end of the push rod, so that the push rod cannot contact the pressure sensor during subsequent vibration.

[0023] S3: Then, the motor output drives the round seat to rotate. The round seat drives the floating frame to move up and down along the guide rod through the eccentric circle and connecting rod, so that the floating frame vibrates the cold-rolled strip below through the pressure roller in the position assembly.

[0024] S4: Finally, during the feeding process, the cold-rolled strip steel passes through the pickling tank in sequence at different positions for pickling treatment. When the cold-rolled strip steel leaves the pickling tank, it can be leveled by scraper.

[0025] Specifically, in step S3, the screw is rotated by inserting an Allen wrench into the Allen hole, causing the screw to move the eccentric circle via the slider.

[0026] This invention provides a surface pretreatment system and pickling method for cold-rolled strip steel. Compared with the prior art, it has the following advantages:

[0027] 1. By using pressure rollers to vibrate the cold-rolled strip steel at a small amplitude, the contact and mixing of the acid solution with the surface of the cold-rolled strip steel can be accelerated, making the chemical reaction more complete and thus promoting the decomposition of impurities. In addition, the vibration can also cause the decomposed substances on the surface of the cold-rolled strip steel to detach from the surface and settle to the bottom of the pickling tank under the action of gravity, preventing the decomposed substances from re-adhering to the surface of the cold-rolled strip steel and affecting the pickling effect.

[0028] 2. By rotating the lead screw to move the eccentric circle on the slider, the range of rotation of the circular seat is changed, thereby adjusting the amplitude of the up-and-down vibration of the pressure roller in the floating frame driven position assembly. This allows it to be adapted to cold-rolled strip steel with different toughness. The vibration amplitude can be appropriately increased for cold-rolled strip steel with higher toughness, and decreased for cold-rolled strip steel with lower toughness.

[0029] 3. When the pressure roller contacts the cold-rolled strip, the reverse force of the cold-rolled strip pushes the pressure roller to drive the shaft block to slide along the inside of the shaft frame. At the same time, the shaft block drives the push rod to move upward along the inside of the limit sleeve, so that the upper end of the push rod contacts the pressure sensor, thereby stopping the drive of the first electric push rod and realizing the automatic determination of the position when the pressure roller contacts the cold-rolled strip.

[0030] 4. When the output end of the second electric push rod drives the pressure sensor to the lowest position, it is the initial position. At this time, the push rod will contact the pressure sensor when it moves upward. When the output end of the second electric push rod drives the pressure sensor to the highest position, the push rod will not contact the pressure sensor when it moves upward. This avoids accidental contact between the push rod and the pressure sensor during subsequent vibration and prevents frequent impacts. Attached Figure Description

[0031] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0032] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0033] Figure 3 This is a schematic diagram of the front-end structure of the present invention;

[0034] Figure 4 This is a schematic diagram of the structure of the front end of the actuator in this invention;

[0035] Figure 5This is a schematic diagram of the rear-end structure of the actuator in this invention;

[0036] Figure 6 This is a schematic diagram of the vibration component in this invention;

[0037] Figure 7 This is a schematic diagram showing the split structure of the circular base and the eccentric circle in this invention;

[0038] Figure 8 This is a schematic diagram of the position component in the present invention;

[0039] Figure 9 This is a cross-sectional structural diagram of the auxiliary component in this invention;

[0040] Figure 10 This is a schematic diagram of the limiting mechanism in this invention.

[0041] In the diagram: 1. Pickling tank; 2. Actuator; 21. Vibration assembly; 211. Fixed frame; 212. Guide rod; 213. Floating frame; 214. Vertical frame; 215. Motor; 216. Round seat; 217. Slider; 218. Eccentric circle; 219. Connecting rod; 2110. Lead screw; 2111. Socket hexagonal hole; 22. Positioning assembly; 221. Shaft seat; 222. Support rod; 223. First electric push rod; 224. Shaft bracket; 225. Shaft block; 226. Pressure roller; 227. Limiting... 228. Position sleeve; 229. Push rod; 2210. Second electric push rod; 2210. Pressure sensor; 23. Auxiliary component; 231. Mounting base; 232. Scraper; 233. Spring; 3. Limiting mechanism; 31. Main component; 311. Mounting plate; 312. Upright rod; 313. Protrusion; 314. Guide plate; 315. Guide groove; 316. Third electric push rod; 32. Limiting component; 321. Limiting frame; 322. Groove; 4. Upper guide roller; 5. Lower guide roller; 6. Cold-rolled strip steel. Detailed Implementation

[0042] 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0043] Please see Figure 1-10This invention provides a surface pretreatment system and pickling method based on cold-rolled strip steel: The surface pretreatment system based on cold-rolled strip steel includes a pickling tank 1 and a cold-rolled strip steel 6. An actuator 2 is installed on the pickling tank 1 to control the vibration of the cold-rolled strip steel 6 during the pickling process. A limit mechanism 3 is installed on the pickling tank 1 to guide the cold-rolled strip steel 6 during conveying and pickling. The actuator 2 includes:

[0044] The vibration assembly 21 includes a fixed frame 211 fixed to the top of the pickling tank 1, guide rods 212 fixed on both sides of the top of the fixed frame 211, a floating frame 213 longitudinally slidably installed above the fixed frame 211 via the guide rods 212 on both sides, a vertical frame 214 fixed in the middle of the top of the fixed frame 211 and the vertical frame 214 passes through the floating frame 213, a motor 215 installed at the rear end of the vertical frame 214, a round seat 216 fixed at the output end of the motor 215, a slider 217 slidably installed inside the round seat 216, an eccentric circle 218 fixed at the front end of the slider 217, and a connecting rod 219 pivotally connected to the outer edge of one side of the front end of the eccentric circle 218, with the lower end of the connecting rod 219 pivotally connected to the upper end of the floating frame 213.

[0045] The position assembly 22 includes a bearing seat 221 fixed on both sides of the top of the floating frame 213, a support rod 222 hinged to the front end of the bearing seat 221, a shaft frame 224 fixed between the lower ends of the two support rods 222, shaft blocks 225 slidably installed inside both ends of the shaft frame 224, and a pressure roller 226 rotatably installed between the two shaft blocks 225.

[0046] The auxiliary component 23 includes a mounting base 231 fixed to the bottom rear end of the bracket 211.

[0047] In this embodiment, the small-amplitude vibration of the cold-rolled strip 6 by the pressure roller 226 can accelerate the contact and mixing of the acid solution with the surface of the cold-rolled strip 6, making the chemical reaction more complete and thus promoting the decomposition of impurities. In addition, the vibration can also cause the decomposed substances on the surface of the cold-rolled strip 6 to detach from the surface and settle to the bottom of the pickling tank 1 under the action of gravity, so as to prevent the decomposed substances from re-adhering to the surface of the cold-rolled strip 6 and affecting the pickling effect.

[0048] Specifically, the vibration assembly 21 also includes a lead screw 2110 rotatably installed inside the round seat 216, and the lead screw 2110 is threadedly installed with the slider 217, with internal hexagonal holes 2111 opened at both ends of the lead screw 2110.

[0049] In this embodiment, by rotating the lead screw 2110 to drive the eccentric circle 218 on the slider 217 to move, the range of rotation of the round seat 216 is changed, thereby adjusting the amplitude of the up-and-down vibration of the pressure roller 226 in the position component 22 driven by the floating frame 213, so that it can be adapted to cold-rolled strip steel 6 with different toughness. The vibration amplitude can be appropriately increased for cold-rolled strip steel 6 with higher toughness, and decreased for cold-rolled strip steel with lower toughness.

[0050] Specifically, the positioning component 22 also includes a first electric push rod 223 pivotally connected to the upper end of the bearing seat 221, and the output end of the first electric push rod 223 is pivotally connected to the upper end of the support rod 222.

[0051] In this embodiment, the pressure roller 226 is made of a smooth metal material to prevent it from being easily corroded by acid and to avoid scratches when it comes into contact with the cold-rolled strip steel 6 and vibrates it.

[0052] Specifically, the position component 22 also includes a limiting sleeve 227 rotatably mounted on the outer wall of the support rod 222, a push rod 228 rotatably mounted on the outer wall of the shaft block 225, and the push rod 228 slidably mounted through the limiting sleeve 227, a second electric push rod 229 mounted on the outer wall of the limiting sleeve 227, and a pressure sensor 2210 mounted on the output end of the second electric push rod 229.

[0053] In this embodiment, when the output end of the second electric push rod 229 drives the pressure sensor 2210 to the lowest position, it is the initial position. At this time, when the push rod 228 moves upward, it will contact the pressure sensor 2210. When the output end of the second electric push rod 229 drives the pressure sensor 2210 to the highest position, the push rod 228 will not contact the pressure sensor 2210 when it moves upward. This avoids accidental contact between the push rod 228 and the pressure sensor 2210 during subsequent vibrations, and prevents frequent collisions.

[0054] Specifically, the auxiliary component 23 also includes a scraper 232 that is slidably mounted through the rear end of the mounting base 231, and several springs 233 installed inside the rear end of the mounting base 231.

[0055] In this embodiment, the pressure of the spring 233 can push the scraper 232 to always be in contact with the cold-rolled strip 6 and apply a certain force to the cold-rolled strip 6, thereby leveling the cold-rolled strip 6 that has left the pickling tank 1.

[0056] Specifically, the limiting mechanism 3 includes:

[0057] The main component 31 includes a mounting plate 311 fixed to the outer walls of both the front and rear ends of the pickling tank 1, several uprights 312 slidably mounted on the outer wall of the mounting plate 311, and a protrusion 313 installed in the middle of the outer wall of the uprights 312.

[0058] The limiting component 32 includes a limiting frame 321 fixed to the upper end of the upright 312, and a slot 322 opened on the limiting frame 321.

[0059] In this embodiment, during the process of conveying multiple cold-rolled strip steels 6 by the upper guide roller 4 and the lower guide roller 5, the adjacent limiting frames 321 can limit the position of the cold-rolled strip steels 6 between them, so as to prevent the cold-rolled strip steels 6 from shifting position during the conveying and vibration process.

[0060] Specifically, the main component 31 also includes a guide plate 314 that is longitudinally slidably mounted on the mounting plate 311, a number of guide grooves 315 opened inside the guide plate 314, and a protrusion 313 located inside the corresponding guide groove 315. A third electric push rod 316 is pivotally connected to both ends of the outer wall of the mounting plate 311, and the output end of the third electric push rod 316 is pivotally connected to the guide plate 314.

[0061] In this embodiment, the guide plate 314 drives the upright 312 through the guide groove 315 and the protrusion 313, so that each upright 312 can drive the corresponding limiting frame 321 to move synchronously and at equal distances, thereby adapting and adjusting the spacing between adjacent limiting frames 321 according to the width of the cold-rolled strip 6.

[0062] Specifically, upper guide rollers 4 are rotatably installed at both the front and rear ends of the top of the pickling tank 1, and lower guide rollers 5 are rotatably installed at both the front and rear ends of the lower part of the pickling tank 1. The upper and lower ends of the limiting frame 321 are respectively slidably mounted on the upper guide rollers 4 and the lower guide rollers 5.

[0063] This invention also discloses a pickling method based on a surface pretreatment system for cold-rolled strip steel, comprising the following steps:

[0064] S1: First, the cold-rolled strip steel 6 is conveyed during the feeding process by the upper guide roller 4 and the lower guide roller 5 at both ends, so that the pickling tank 1 can pickle the cold-rolled strip steel 6; and then, the guide plate 314 is driven to move upward by the output end of the third electric push rod 316. The guide plate 314 drives the upright 312 to move laterally along the mounting plate 311 through the guide groove 315 and the protrusion 313. The upright 312 drives the limiting frame 321 to slide laterally along the upper guide roller 4 and the lower guide roller 5, so that the adjacent limiting frames 321 limit the cold-rolled strip steel 6 between them.

[0065] S2: Next, the output end of the first electric push rod 223 drives the support rod 222 to rotate. When the support rod 222 drives the pressure roller 226 on the shaft frame 224 to contact the cold-rolled strip 6, the reverse force of the cold-rolled strip 6 pushes the pressure roller 226 to drive the shaft block 225 to slide along the inside of the shaft frame 224. At the same time, the shaft block 225 drives the push rod 228 to move upward along the inside of the limiting sleeve 227, so that the upper end of the push rod 228 contacts the pressure sensor 2210, thereby stopping the drive of the first electric push rod 223 and determining the position of the pressure roller 226. Then, the second electric push rod 229 drives the pressure sensor 2210 to rise and disengage from the upper end of the push rod 228, so that the push rod 228 cannot contact the pressure sensor 2210 during subsequent vibration.

[0066] S3: Then, the output end of the motor 215 drives the round seat 216 to rotate. The round seat 216 drives the floating frame 213 to move up and down along the guide rod 212 through the eccentric circle 218 and the connecting rod 219, so that the floating frame 213 vibrates the cold-rolled strip 6 below through the pressure roller 226 in the position component 22.

[0067] S4: Finally, during the feeding process, the cold-rolled strip 6 passes through the pickling tank 1 in sequence at different positions for pickling treatment. When the cold-rolled strip 6 leaves the pickling tank 1, it can be leveled by scraper 232.

[0068] Specifically, in step S3, the lead screw 2110 is rotated by inserting an Allen wrench into the Allen hole 2111, so that the lead screw 2110 drives the eccentric circle 218 to move through the slider 217.

[0069] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0070] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A surface pretreatment system based on cold-rolled strip steel, comprising a pickling tank (1) and cold-rolled strip steel (6), characterized in that: The pickling tank (1) is equipped with an actuator (2) for controlling the vibration of the cold-rolled strip (6) during the pickling process. The pickling tank (1) is equipped with a limit mechanism (3) for guiding the cold-rolled strip (6) during the conveying and pickling process. The actuator (2) includes: The vibration assembly (21) includes a fixed frame (211) fixed to the top of the pickling tank (1), guide rods (212) fixed on both sides of the top of the fixed frame (211), a floating frame (213) longitudinally slidably installed above the fixed frame (211) via the guide rods (212) on both sides, a vertical frame (214) fixed in the middle of the top of the fixed frame (211), and the vertical frame (214) passes through the floating frame (213), a motor (215) installed at the rear end of the vertical frame (214), a round seat (216) fixed at the output end of the motor (215), a slider (217) slidably installed inside the round seat (216), an eccentric circle (218) fixed at the front end of the slider (217), a connecting rod (219) pivotally connected to the outer edge of one side of the front end of the eccentric circle (218), and the lower end of the connecting rod (219) pivotally connected to the upper end of the floating frame (213); The position assembly (22) includes a bearing seat (221) fixed on both sides of the top of the floating frame (213), a support rod (222) hinged to the front end of the bearing seat (221), a shaft frame (224) fixed between the lower ends of the two support rods (222), a shaft block (225) slidably installed inside both ends of the shaft frame (224), a pressure roller (226) rotatably installed between the two shaft blocks (225), and a pressure sensor (2210) provided on one side of the support rod (222). The auxiliary component (23) includes a mounting base (231) fixed at the rear end of the bottom of the bracket (211), and a scraper (232) is slidably mounted through the rear end of the mounting base (231).

2. The surface pretreatment system based on cold-rolled strip steel according to claim 1, characterized in that: The vibration assembly (21) also includes a lead screw (2110) rotatably installed inside the round seat (216), and the lead screw (2110) is threadedly installed with the slider (217), and both ends of the lead screw (2110) have internal hexagonal holes (2111).

3. The surface pretreatment system based on cold-rolled strip steel according to claim 1, characterized in that: The position component (22) further includes a first electric push rod (223) pivotally connected to the upper end of the bearing seat (221), and the output end of the first electric push rod (223) is pivotally connected to the upper end of the support rod (222).

4. The surface pretreatment system based on cold-rolled strip steel according to claim 3, characterized in that: The position component (22) further includes a limiting sleeve (227) rotatably mounted on the outer wall of the support rod (222), a push rod (228) rotatably mounted on the outer wall of the shaft block (225), and the push rod (228) slidably mounted through the limiting sleeve (227), a second electric push rod (229) mounted on the outer wall of the limiting sleeve (227), and a pressure sensor (2210) mounted on the output end of the second electric push rod (229).

5. The surface pretreatment system based on cold-rolled strip steel according to claim 1, characterized in that: The auxiliary component (23) also includes several springs (233) installed at the rear end inside the mounting base (231).

6. The surface pretreatment system based on cold-rolled strip steel according to claim 1, characterized in that: The limiting mechanism (3) includes: The main component (31) includes a mounting plate (311) fixed to the outer walls of both ends of the pickling tank (1), several uprights (312) slidably mounted on the outer wall of the mounting plate (311), and a protrusion (313) installed in the middle of the outer wall of the uprights (312). The limiting component (32) includes a limiting frame (321) fixed at the upper end of the upright (312) and a slot (322) opened on the limiting frame (321).

7. The surface pretreatment system based on cold-rolled strip steel according to claim 6, characterized in that: The main component (31) also includes a guide plate (314) that is longitudinally slidably mounted on the mounting plate (311), a number of guide grooves (315) are opened inside the guide plate (314), and a protrusion (313) is located inside the corresponding guide groove (315). A third electric push rod (316) is pivotally connected to both ends of the outer wall of the mounting plate (311), and the output end of the third electric push rod (316) is pivotally connected to the guide plate (314).

8. The surface pretreatment system based on cold-rolled strip steel according to claim 6, characterized in that: The pickling tank (1) is rotatably mounted with upper guide rollers (4) at both the front and rear ends of the top, and lower guide rollers (5) are rotatably mounted at both the front and rear ends of the lower part of the pickling tank (1). The upper and lower ends of the limiting frame (321) are respectively sleeved and slidably mounted on the upper guide rollers (4) and the lower guide rollers (5).

9. The pickling method based on the surface pretreatment system of cold-rolled strip steel according to any one of claims 1-8, characterized in that: Includes the following steps: S1: First, the cold-rolled strip steel (6) in the material conveying process enters the pickling tank (1), and the cold-rolled strip steel (6) in the material conveying process is limited by the limiting mechanism (3); S2: Next, the pressure roller (226) in the position assembly (22) contacts the cold-rolled strip (6) and determines the initial position of the pressure roller (226); S3: Then, the output end of the motor (215) drives the round seat (216) to rotate. The round seat (216) drives the floating frame (213) to move up and down along the guide rod (212) through the eccentric circle (218) and the connecting rod (219), so that the floating frame (213) vibrates the cold-rolled strip steel (6) below through the pressure roller (226) in the position assembly (22); S4: Finally, the cold-rolled strip (6) in the material conveying process passes through the pickling tank (1) in sequence and is pickled under the vibration of the pressure roller (226).

10. The pickling method based on the surface pretreatment system of cold-rolled strip steel according to claim 9, characterized in that: In step S4, when the cold-rolled strip (6) leaves the pickling tank (1), the cold-rolled strip (6) is leveled by the auxiliary component (23) during the material conveying process.

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