A surface polishing treatment method for cold-formed steel

Abstract

The present invention relates to the technical field of steel processing, and specifically discloses a surface polishing treatment method for cold-formed steel, aiming to solve the problems of poor polishing efficiency and quality in the prior art; it includes the following steps: Pretreatment: Place the section steel A on the transmission component for transmission, and then stop the section steel A at the position of the pretreatment component. At this time, an immersion treatment area is constructed, and a pretreatment liquid is sent into the immersion treatment area through a liquid supply mechanism; Adaptive mechanical rough polishing: Transfer the section steel A to the position of the spraying treatment component, and evenly process the outer side of the section steel A through the spraying treatment component. With the cooperation of the transmission of the transmission component, a dead-angle-free spraying treatment is realized. The present invention is designed for the existing needs, constructs a flow-through processing method for the section steel A, and can perform pretreatment, adaptive mechanical rough polishing, catalytic chemical fine polishing, and ultrasonic-assisted passivation treatment on the section steel A, thereby greatly improving the surface quality of the section steel, and the flow-through processing also ensures the processing quality.

Description

Technical Field

[0001] The present invention relates to the technical field of steel processing, and particularly to a method for surface polishing treatment of cold-formed steel. Background Art

[0002] During the processing of cold-formed steel, surface defects such as scale, burrs, scratches, and residual stress are easily generated. The traditional polishing methods have the following pain points: Mechanical polishing (grinding wheel / sandpaper): low efficiency and easy to cause surface damage; chemical polishing: serious acid pollution and difficult to control the corrosion of high-strength steel (such as Q345); electrochemical polishing: high equipment cost and not suitable for continuous production of large-sized steel sections. The patent with the authorized publication number of CN117300871B discloses a polishing device for special-shaped steel pipes, which can push the special-shaped steel pipe to move through a moving component, so that the polishing component can polish the end of the special-shaped steel pipe and improve the polishing efficiency of the special-shaped steel pipe. However, this pure mechanical polishing method has the problem of poor polishing effect, and the continuity of polishing is poor, and it is not suitable for polishing large-volume steel sections either.

[0003] Based on this, a method for surface polishing treatment of cold-formed steel is now provided, which can eliminate the drawbacks of existing devices. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for surface polishing treatment of cold-formed steel, which solves the problems of poor polishing efficiency and polishing quality in the prior art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A processing device in a method for surface polishing treatment of cold-formed steel includes a transmission component for transmitting the steel section A. The transmission component is sequentially provided with a pretreatment component for preliminary treatment of the steel section A, a spraying treatment component for mechanical polishing treatment of the steel section A, a catalytic fine polishing component for fine treatment of the steel section A, and a passivation treatment component for final passivation treatment of the surface of the steel section A. The end of the transmission component is connected to a drying component.

[0007] On the basis of the above technical solutions, the present invention also provides the following optional technical solutions:

[0008] In an optional solution: The spraying treatment component includes a fixed outer ring sleeved outside the transmission path of the steel section A. A rotating inner ring is rotatably provided inside the fixed outer ring. A plurality of nozzles are communicated inside the rotating inner ring. The air inlet end of the fixed outer ring is communicated with a spraying pump through a feeding pipe. The suction end of the spraying pump is provided with a suction pipe. The lower end of the suction pipe extends into the spraying material tank. The pipe axis of the nozzle is arranged at an acute angle with the tangent plane of the rotating inner ring.

[0009] In an optional scheme: the pretreatment component, catalytic polishing component and passivation treatment component all include two parallelly arranged blocking baffles, the blocking baffles are arranged in the transmission gap of the transmission component, the inner wall of the transmission frame is provided with a guide slide groove matching the blocking baffles, the two blocking baffles are connected by a connecting crossbeam, the center position of the connecting crossbeam is connected to the driving cross bar, the other end of the driving cross bar is connected to the output end of the lifting push rod, the lifting push rod is installed on the outside of the transmission frame, the bottom of the transmission frame is provided with a docking groove matching the bottom of the blocking baffle, so that the blocking baffle isolates the inside of the transmission frame into an immersion treatment area, and the inside of the transmission frame is provided with a liquid supply mechanism for replenishing liquid into the immersion treatment area.

[0010] In an optional scheme: the liquid supply mechanism includes a liquid storage tank for storing liquid, a liquid supply pump is provided on the liquid storage tank, the liquid suction end of the liquid supply pump extends into the interior of the liquid storage tank, the liquid outlet end of the liquid supply pump is connected with a liquid supply pipe, the upper end of the liquid supply pipe passes through the transmission frame and is connected with the immersion treatment area, the bottom of the transmission frame where the immersion treatment area is located is also provided with a liquid return port, the liquid return port is connected with the liquid storage tank through a reflux pipe, and a solenoid valve is provided on the reflux pipe.

[0011] In an optional solution: the transmission component includes a transmission frame, the cross-section of the transmission frame is a U-shaped long strip structure, and a plurality of transmission rollers for supporting the steel section A are horizontally arranged inside the transmission frame. The plurality of transmission rollers constitute a transmission surface for transferring the steel section A, and the transmission rollers are connected to a transmission drive mechanism for driving the transmission rollers to rotate.

[0012] In an optional scheme: the transmission drive mechanism includes a transmission wheel arranged on the outside of the transmission frame, the transmission wheel is connected to the transmission roller through a transmission shaft, and multiple transmission wheels are connected through a transmission belt transmission. A tensioning wheel is rotatably arranged between adjacent transmission wheels, and one end of one transmission roller is connected to a driving motor for driving its rotation. The driving motor is installed on the outside of the transmission frame, and one of the transmission rollers is driven to rotate by the driving motor, and the transmission roller drives the transmission wheel to rotate. The transmission wheel drives multiple transmission wheels to rotate through the transmission belt, thereby providing power for the synchronous rotation of the transmission rollers.

[0013] In an optional solution: a collecting port and a collecting bucket are provided at the bottom of the transmission frame where the spray processing assembly is located, so as to collect the waste materials.

[0014] The solution is as follows:

[0015] Step 1: Pretreatment: Place section steel A on the transmission component for transmission, and then stop section steel A at the position of the pretreatment component. At this time, an immersion treatment area is constructed, and a pretreatment solution is fed into the immersion treatment area through a liquid supply mechanism. The formula of the pretreatment solution is: sodium hydroxide 50g / L + sodium carbonate 30g / L + surfactant (OP-10) 5g / L, temperature: 60 - 70°C, time: 5 - 10 minutes; with ultrasonic waves of a frequency of 40kHz to remove oil stains and loosen the oxide scale, providing a clean surface for subsequent polishing;

[0016] Step 2: Adaptive mechanical rough polishing: Transfer section steel A, and evenly treat the outer side of section steel A through the spraying treatment component. With the cooperation of the transmission of the transmission component, dead-angle-free spraying treatment is achieved;

[0017] Granular material: Silicon carbide (80 - 120 mesh) is mixed with polyurethane elastomer to make a flexible abrasive block, which can fit complex cross-sections, and the pressure is controlled at 0.3 - 0.5MPa;

[0018] Silicon carbide abrasive: 80 - 120 mesh is medium-coarse grain size, providing cutting ability, mainly used to remove deeper defects such as surface oxide scale, burrs, and welding slag.

[0019] Step 3: Catalytic chemical fine polishing, transfer section steel A to the position of the catalytic fine polishing component, construct an immersion treatment area, and feed a low-concentration acid solution and a corrosion inhibitor into the immersion treatment area through a liquid supply mechanism. Specifically, phosphoric acid (85%) 150mL + sulfuric acid (98%) 50mL + sodium nitrate 20g + hexamethylenetetramine 10g + water is made up to 1L, temperature: 45 - 55°C, time: 3 - 5 minutes, with megasonic vibration (frequency 1 - 3MHz) to accelerate the penetration of the solution;

[0020] Step 4: Ultrasonic-assisted passivation, transfer section steel A to the position of the passivation treatment component, then construct an immersion treatment area, and feed a passivation solution into the immersion treatment area through a liquid supply mechanism. The formula of the passivation solution is: γ-aminopropyltriethoxysilane (KH550) 2% + ethanol 50% + deionized water 48%, pH is adjusted to 4.5 (acetic acid);

[0021] Temperature: normal temperature, time: 2 - 3 minutes, section steel is immersed in the passivation solution, and at the same time, ultrasonic waves (frequency 20kHz) are applied to break bubbles to form a uniform silane film.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] 1. The present invention is designed for the existing needs and constructs a flow - type processing method for section steel A, which can perform pre - treatment, adaptive mechanical rough polishing, catalytic chemical fine polishing, and ultrasonic - assisted passivation treatment on section steel A, thereby greatly improving the surface quality of the section steel, and the flow - type processing also ensures the processing quality.

[0024] 2. When the present invention performs mechanical polishing: abrasive particles are wrapped by polyurethane, and during grinding, the abrasive cutting force is evenly released through elastic deformation, reducing the risk of scratching the surface of the section steel.

[0025] 3. The present invention can perform horizontal rolling transfer on section steel A, avoiding the problem of treatment dead - corners caused by traditional clamping and ensuring the treatment quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is the processing flow chart of the present invention.

[0027] Figure 2 is the schematic structural diagram of one side of the present invention.

[0028] Figure 3 is the schematic structural diagram of the other side of the present invention.

[0029] Figure 4 is the schematic structural diagram of the spraying treatment component of the present invention.

[0030] Figure 5 is the schematic structural diagram of the guiding chute structure in the present invention.

[0031] Annotation of reference numerals: transfer rack 100, conveyor belt 101, transfer wheel 102, transfer roller 103, drive motor 104, tensioning wheel 105;

[0032] spraying treatment component 500, passivation treatment component 400, catalytic fine - polishing component 300, pre - treatment component 200;

[0033] connecting cross - beam 401, driving cross - bar 402, blocking partition 403, lifting push rod 404, return pipe 405, liquid storage tank 406, liquid supply pump 407, liquid supply pipe 408, guiding chute 409, section steel A 410;

[0034] spray coating tank 501, suction pipe 502, spraying pump 503, feeding pipe 504, spray head 505, fixed outer ring 506, rotating inner ring 507. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] As Figures 1 - 5 shown, the embodiment of the present invention provides a polishing treatment device in a cold-formed steel surface polishing treatment method, including a transmission component for transmitting the section steel A410. A pretreatment component 200 for preliminarily treating the section steel A410, a spraying treatment component 500 for mechanically polishing the section steel A410, a catalytic fine polishing component 300 for finely treating the section steel A410, and a passivation treatment component 400 for finally passivating the surface of the section steel A410 are sequentially arranged on the transmission component. The end of the transmission component is connected to a drying component. After treatment, the drying component is used to perform a drying operation on the surface of the section steel A410;

[0037] The spraying treatment component 500 includes a fixed outer ring 506 sleeved outside the transmission path of the section steel A410. A rotating inner ring 507 is rotatably arranged inside the fixed outer ring 506. A plurality of nozzles 505 are communicated inside the rotating inner ring 507. The air inlet end of the fixed outer ring 506 is communicated with a spraying pump 503 through a feeding pipe 504. A suction pipe 502 is arranged at the suction end of the spraying pump 503. The lower end of the suction pipe 502 extends into a spraying material tank 501. In this way, the particulate material in the spraying material tank 501 can be sent into the fixed outer ring 506 through the suction pipe 502, and then the high-pressure gas mixed with particles is ejected along the nozzles 505, so as to perform a polishing operation on the surface of the section steel A410. The pipeline axis of the nozzle 505 is arranged at an acute angle with the section of the rotating inner ring 507. In this way, the reaction force generated by the jet of the nozzle 505 will construct a rotating torque, so that the rotating inner ring 507 rotates rapidly, so as to perform a dead-angle-free spraying operation on the outside of the section steel A410;

[0038] The pretreatment component 200, the catalytic fine polishing component 300, and the passivation treatment component 400 all include two blocking partitions 403 arranged in parallel. The blocking partitions 403 are arranged in the transmission gap of the transmission component. A guiding chute 409 matching the blocking partition 403 is provided on the inner wall of the transmission frame 100. A connecting cross beam 401 is bridged between the two blocking partitions 403. The center position of the connecting cross beam 401 is connected to the driving cross bar 402. The other end of the driving cross bar 402 is connected to the output end of the lifting push rod 404. The lifting push rod 404 is installed outside the transmission frame 100. By driving the lifting push rod 404 to drive the driving cross bar 402 to move downward, the driving cross bar 402 drives the two blocking partitions 403 to move downward along the guiding chute 409 through the connecting cross beam 401. A docking groove matching the bottom of the blocking partition 403 is provided at the bottom of the transmission frame 100. In this way, the blocking partition 403 can isolate the inside of the transmission frame 100 into an immersion treatment area, so that the section steel A410 can be immersed and treated by the treatment liquid. A liquid supply mechanism for supplementing liquid to the immersion treatment area is provided inside the transmission frame 100. Through the liquid supply mechanism, the target liquid can be added to the immersion treatment area, so as to realize the treatment operations for different stages of the section steel A410;

[0039] The liquid supply mechanism includes a liquid storage tank 406 for storing liquid. A liquid supply pump 407 is provided on the liquid storage tank 406. The liquid suction end of the liquid supply pump 407 extends into the liquid storage tank 406. The liquid outlet end of the liquid supply pump 407 is communicated with a liquid supply pipe 408. The upper end of the liquid supply pipe 408 passes through the transmission frame 100 and is communicated with the immersion treatment area. A liquid return port is also provided at the bottom of the transmission frame 100 where the immersion treatment area is located. The liquid return port is communicated with the liquid storage tank 406 through a return pipe 405. An electromagnetic valve is provided on the return pipe 405. In this way, after a single treatment, the electromagnetic valve can be opened to return the liquid to the liquid storage tank 406. After the liquid is recovered, the blocking partition 403 can be lifted up so that the section steel A410 can be smoothly transferred to the next stage;

[0040] The transmission component includes a transmission frame 100. The cross section of the transmission frame 100 is a U-shaped long strip structure. A plurality of transmission rollers 103 for supporting the section steel A410 are horizontally arranged inside the transmission frame 100. The plurality of transmission rollers 103 constitute a transmission surface for transferring the section steel A410. The transmission rollers 103 are connected to a transmission driving mechanism for driving them to rotate. Under the action of the transmission driving mechanism, the plurality of transmission rollers 103 rotate synchronously, thereby providing power for the transmission of the section steel A410. This transmission method ensures that there is no dead angle problem in the surface treatment of the section steel A410 and guarantees the processing quality;

[0041] The transmission drive mechanism includes a transmission wheel 102 arranged on the outside of the transmission frame 100, the transmission wheel 102 is connected to the transmission roller 103 through a transmission shaft, and multiple transmission wheels 102 are connected through a transmission belt 101. A tensioning wheel 105 is rotatably arranged between adjacent transmission wheels 102, and the tensioning wheel 105 presses down the upper side of the transmission belt 101 to ensure smooth transmission between the transmission wheel 102 and the transmission belt 101. One end of one of the transmission rollers 103 is connected to a driving motor 104 for driving the transmission roller 103 to rotate. The driving motor 104 is installed on the outside of the transmission frame 100, and one of the transmission rollers 103 is driven to rotate by the driving motor 104, and the transmission roller 103 drives the transmission wheel 102 to rotate. The transmission wheel 102 drives multiple transmission wheels 102 to rotate through the transmission belt 101, thereby providing power for the synchronous rotation of the transmission rollers 103.

[0042] The specific treatment method includes the following steps: pretreatment → adaptive mechanical rough polishing → catalytic chemical fine polishing → ultrasonic assisted passivation;

[0043] Step 1: Pretreatment: Place the steel A410 on the transmission component for transmission, and then keep the steel A410 at the position of the pretreatment component 200. At this time, an immersion treatment area is constructed, and the pretreatment liquid is fed into the immersion treatment area through the liquid supply mechanism. The formula of the pretreatment liquid is: sodium hydroxide 50g / L + sodium carbonate 30g / L + surfactant (OP-10) 5g / L, temperature: 60-70℃, time: 5-10 minutes; with the help of ultrasonic waves with a frequency of 40kHz, remove oil stains and loose oxide scale to provide a clean surface for subsequent polishing;

[0044] Step 2: Adaptive mechanical rough polishing: transfer the steel A410, and evenly treat the outer side of the steel A410 through the spraying treatment component 500, and cooperate with the transmission of the transmission component to achieve spraying treatment without dead angles;

[0045] Granular material: Silicon carbide (80-120 mesh) is mixed with polyurethane elastomer to make a flexible grinding block that can fit complex cross-sections, and the pressure is controlled at 0.3-0.5MPa;

[0046] Silicon carbide abrasive: 80-120 mesh is medium-coarse particle size, providing cutting ability, mainly used to remove deeper defects such as surface oxide scale, burrs, welding slag, etc.

[0047] Polyurethane elastomer: As a flexible matrix, it has high elasticity, wear resistance and corrosion resistance. Its hardness is usually Shore A50-A80, and its hardness can be controlled by adjusting the formula.

[0048] Flexible fit: Polyurethane elastomer enables the grinding block to adapt to the complex cross-sections of cold-bent steel (such as round, rectangular, and special-shaped tubes), avoiding the stress concentration problem of the corners of rigid molds.

[0049] Elastic grinding: The abrasive particles are wrapped by polyurethane. During grinding, the cutting force of the abrasive grains is evenly released through elastic deformation, reducing the risk of scratching the surface of the section steel;

[0050] Step 3: Catalytic chemical polishing. Transfer the section steel A410 to the position of the catalytic polishing assembly 300, construct an immersion treatment area, and feed low-concentration acid solution and corrosion inhibitor into the immersion treatment area through the liquid supply mechanism. Specifically, it is phosphoric acid (85%) 150 mL + sulfuric acid (98%) 50 mL + sodium nitrate 20 g + hexamine 10 g + water to make up to 1 L, temperature: 45 - 55 °C, time: 3 - 5 minutes, with megasonic vibration (frequency 1 - 3 MHz) to accelerate the penetration of the solution;

[0051] Step 4: Ultrasonic-assisted passivation. Transfer the section steel A410 to the position of the passivation treatment assembly 400, then construct an immersion treatment area, and feed the passivation solution into the immersion treatment area through the liquid supply mechanism. The formula of the passivation solution: γ-aminopropyltriethoxysilane (KH550) 2% + ethanol 50% + deionized water 48%, pH adjusted to 4.5 (acetic acid);

[0052] Temperature: room temperature, time: 2 - 3 minutes. The section steel is immersed in the passivation solution, and at the same time, ultrasonic waves (frequency 20 kHz) are applied to break the bubbles to form a uniform silane film;

[0053] Effect: The thickness of the silane film is 1 - 2 μm, and the corrosion resistance time in the salt spray test is ≥720 hours;

[0054] Low-concentration catalytic chemical polishing solution;

[0055] Sodium nitrate and hexamine are added to the phosphoric acid - sulfuric acid system, and the polishing rate is ≥15 μm / min and the substrate corrosion rate is <2 μm / min.

[0056] Megasonic - ultrasonic combination strengthening:

[0057] Megasonic waves are used to accelerate mass transfer in the chemical polishing stage, and ultrasonic waves are used to enhance film formation in the passivation stage, with the overall efficiency increased by 30%;

[0058] Step 5: Drying: Drying conditions: 120 °C, 10 minutes.

[0059] Table 1:

[0060]

[0061] It can be clearly seen from the data comparison in Table 1 that the treatment method of this application has significant progress compared with the existing treatment methods.

[0062] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for surface polishing treatment of cold-formed steel, characterized in that: It includes the following steps: Step 1: Pretreatment: Place the section steel A (410) on the transmission component for transmission, and then stop the section steel A (410) at the position of the pretreatment component (200). At this time, an immersion treatment area is constructed, and a pretreatment liquid is fed into the immersion treatment area through a liquid supply mechanism; Step 2: Adaptive mechanical rough polishing: Transfer the section steel A (410) to the position of the spraying component (500), and evenly process the outer side of the section steel A (410) through the spraying component (500). With the cooperation of the transmission of the transmission component, a dead-angle-free spraying treatment is achieved; Step 3: Catalytic chemical fine polishing: Transfer the section steel A (410) to the position of the catalytic fine polishing component (300), construct an immersion treatment area, and feed a low-concentration acid solution and an inhibitor into the immersion treatment area through a liquid supply mechanism; Step 4: Ultrasonic-assisted passivation: Transfer the section steel A (410) to the position of the passivation treatment component (400), then construct an immersion treatment area, and feed a passivation liquid into the immersion treatment area through a liquid supply mechanism; The transmission component includes a transmission frame (100), and the cross-section of the transmission frame (100) is a U-shaped long strip structure; The spraying component (500) includes a fixed outer ring (506) sleeved outside the transmission path of the section steel A (410). A rotating inner ring (507) is rotatably arranged inside the fixed outer ring (506). A plurality of nozzles (505) are communicated inside the rotating inner ring (507). The air inlet end of the fixed outer ring (506) is communicated with a spraying pump (503) through a feeding pipe (504). The suction end of the spraying pump (503) is provided with a suction pipe (502). The lower end of the suction pipe (502) extends into the spraying material tank (501). The pipe axis of the nozzle (505) is arranged at an acute angle with the tangent plane of the rotating inner ring (507). A collection port and a collection hopper are arranged at the bottom of the transmission frame (100) where the spraying component (500) is located; The pretreatment component (200), the catalytic fine polishing component (300) and the passivation treatment component (400) all include two parallel blocking partitions (403). The blocking partitions (403) are arranged in the transmission gap of the transmission component. A guiding sliding groove (409) matching the blocking partition (403) is arranged on the inner wall of the transmission frame (100). The two blocking partitions (403) are bridged by a connecting cross beam (401). The central position of the connecting cross beam (401) is connected to a driving cross bar (402). The other end of the driving cross bar (402) is connected to the output end of a lifting push rod (404). The lifting push rod (404) is installed outside the transmission frame (100). A docking groove matching the bottom of the blocking partition (403) is arranged at the bottom of the transmission frame (100), so that the blocking partition (403) isolates the inside of the transmission frame (100) into an immersion treatment area. A liquid supply mechanism for replenishing liquid into the immersion treatment area is arranged inside the transmission frame (100).

2. The cold-formed steel surface polishing treatment method according to claim 1, wherein The formula of the pretreatment liquid is: sodium hydroxide 50g / L + sodium carbonate 30g / L + surfactant 5g / L, temperature: 60-70℃, time: 5-10 minutes; with ultrasonic wave of 40kHz frequency, it can remove oil stains and loose oxide scale to provide a clean surface for subsequent polishing.

3. The cold-formed steel surface polishing treatment method according to claim 1, characterized in that The granular material in the spray processing component (500): silicon carbide and polyurethane elastomer are mixed to form a flexible grinding block, which can fit complex cross-sections, and the pressure is controlled at 0.3-0.5Mpa. The particle size of silicon carbide is 80-120 meshes.

4. The cold-formed steel surface polishing treatment method according to claim 1, characterized in that, In the step 3, the low concentration acid solution and corrosion inhibitor are 150 mL of 85% phosphoric acid + 50 mL of 98% sulfuric acid + 20 g of sodium nitrate + 10 g of urotropine + water to 1 L, temperature: 45-55°C, time: 3-5 minutes, with megasonic vibration, frequency 1-3 MHz, to accelerate solution penetration.

5. The cold-formed steel surface polishing method according to claim 1, characterized in that, In step 4: Passivation solution formula: 2% γ-aminopropyltriethoxysilane + 50% ethanol + 48% deionized water, pH adjusted to 4.5, room temperature, time: 2-3 minutes, steel A is immersed in the passivation solution, and ultrasonic waves are applied at a frequency of 20kHz to break bubbles and form a uniform silane film.

6. The cold-formed steel surface polishing method according to claim 1, characterized in that The liquid supply mechanism comprises a liquid storage tank (406) for storing liquid, a liquid supply pump (407) being provided on the liquid storage tank (406), a liquid suction end of the liquid supply pump (407) extending into the interior of the liquid storage tank (406), a liquid outlet end of the liquid supply pump (407) being connected to a liquid supply pipe (408), an upper end of the liquid supply pipe (408) passing through a transmission frame (100) and being connected to an immersion treatment area, a liquid return port being provided at the bottom of the transmission frame (100) where the immersion treatment area is located, the liquid return port being connected to the liquid storage tank (406) via a reflux pipe (405), and a solenoid valve being provided on the reflux pipe (405).

7. The cold-formed steel surface polishing treatment method according to claim 1, characterized in that, A plurality of transmission rollers (103) for supporting the steel section A (410) are horizontally arranged inside the transmission frame (100); the plurality of transmission rollers (103) form a transmission surface for transferring the steel section A (410); and the transmission rollers (103) are connected to a transmission drive mechanism for driving the transmission rollers to rotate.

8. The cold-formed steel surface polishing method according to claim 7, characterized in that, The transmission drive mechanism comprises a transmission wheel (102) arranged outside the transmission frame (100); the transmission wheel (102) is connected to a transmission roller (103) via a transmission shaft; a plurality of transmission wheels (102) are connected to each other via a transmission belt (101); a tensioning wheel (105) is rotatably arranged between adjacent transmission wheels (102); an end of one of the transmission rollers (103) is connected to a driving motor (104) for driving the transmission roller to rotate; the driving motor (104) is installed outside the transmission frame (100); one of the transmission rollers (103) is driven to rotate via the driving motor (104); the transmission roller (103) drives the transmission wheel (102) to rotate; the transmission wheel (102) drives a plurality of transmission wheels (102) to rotate via the transmission belt (101), thereby providing power for the synchronous rotation of the transmission rollers (103).

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