A protective coating passivation device for galvanized steel plate processing

Abstract

The present invention relates to the technical field of surface treatment of galvanized steel sheets, and in particular to a protective coating passivation device for processing galvanized steel sheets, comprising a passivation tank, a driving assembly, a fixed block, etc.; a liquid inlet is arranged on the upper right side of the passivation tank; a liquid outlet is arranged on the lower left side of the passivation tank; a driving assembly is installed in the passivation tank; and a plurality of fixed blocks are connected to the driving assembly. The present invention realizes guiding the passivation liquid through two first guide plates distributed in an eight-shaped shape, so that the passivation liquid flows to both sides of the galvanized steel sheet, thereby increasing the flow rate of the passivation liquid between the first guide plate and the galvanized steel sheet, flushing the bubbles attached to the front and rear sides of the galvanized steel sheet, thereby separating the bubbles from the surface of the galvanized steel sheet, preventing the bubble area from blocking the contact between the passivation liquid and the zinc layer, and avoiding the area from being unable to form a complete protective film, which affects the continuity and uniformity of the passivation layer.

Description

Technical Field

[0001] The invention relates to the technical field of surface treatment of galvanized steel plates, and in particular to a protective coating passivation device for processing galvanized steel plates. Background Art

[0002] In order to enhance the corrosion resistance and protection of galvanized steel sheets, galvanized steel sheets are usually passivated. The core step of the passivation treatment is to immerse the galvanized steel sheets in the passivation solution. The components of the passivation solution will prompt the formation of a protective film on the surface of the zinc layer. This film has good stability and can significantly slow down or prevent further contact and reaction between air, water and other corrosive media and the metal matrix, thereby improving the corrosion resistance of the galvanized steel sheets.

[0003] Existing passivation tanks are usually equipped with a circulation system. The circulation system and filtration can promptly remove impurities and sediments in the solution and slow down the aging of the solution. However, during the circulation of the passivation solution, the circulation system will bring outside air into the solution when discharging the passivation solution into the passivation tank, causing the formation of bubbles. The bubbles will adhere to the surface of the galvanized steel plate, thereby affecting the formation of a protective film on the surface of the galvanized steel plate, thereby weakening the overall corrosion resistance and shortening the service life of the product. Summary of the invention

[0004] In order to overcome the disadvantage in the prior art that the circulation system will bring outside air into the solution when discharging the passivation liquid into the passivation tank, resulting in the formation of bubbles, and the bubbles will adhere to the surface of the galvanized steel plate, thereby affecting the formation of the protective film on the surface of the galvanized steel plate, thereby weakening the overall corrosion resistance and shortening the service life of the product, the present invention provides a protective coating passivation device for galvanized steel plate processing.

[0005] The technical solution of the present invention is: a protective coating passivation device for galvanized steel plate processing, including a passivation tank; a liquid inlet is arranged on the upper right side of the passivation tank; a liquid outlet is arranged on the lower left side of the passivation tank; it also includes a driving assembly, a fixed block, a fixed rod, a first guide plate and an adapter assembly; a driving assembly is installed in the passivation tank; a plurality of fixed blocks are connected to the driving assembly; a plurality of fixed rods are arranged on each fixed block; a plurality of first guide plates are installed on each fixed rod, and the combination of two adjacent first guide plates is in an eight-shaped shape; an adapter assembly for adapting to galvanized steel plates of different thicknesses is installed on each fixed block.

[0006] Furthermore, a slope is provided at the bottom of the passivation tank, and a side of the slope close to the liquid outlet is lower than a side close to the liquid inlet.

[0007] Furthermore, the driving assembly includes a slide rail and an electric slider; two left-right symmetrical slide rails are fixedly connected to the passivation tank; four electric sliders are slidably connected to each slide rail, and each fixed block is fixedly connected to two adjacent electric sliders.

[0008] Furthermore, the adapter assembly includes a cylinder, a first connecting rod and a second connecting rod; each first guide plate is rotatably connected to an adjacent fixed rod through a torsion spring; a number of cylinders are fixed to each fixed block, with two cylinders forming a group, and the output ends of each group of two cylinders are facing forward and backward respectively; the output end of each cylinder is slidably connected to a first connecting rod; each first guide plate is rotatably connected to a second connecting rod on the upper side, and each second connecting rod is slidably connected to an adjacent first connecting rod.

[0009] Furthermore, it also includes a liquid inlet pipe and a first connecting block; each fixed block is configured as a hollow structure, and a pump is provided inside each fixed block; each fixed block is filled with a defoaming agent for eliminating bubbles; each fixed block is connected to a liquid inlet pipe on the right side; each liquid inlet pipe is fixedly connected to a plurality of first connecting blocks, and the combination of two adjacent first connecting blocks is in an eight-shape; each first connecting block is provided with a plurality of nozzles, and each nozzle is connected to the liquid inlet pipe through a connecting pipe.

[0010] Furthermore, the nozzles located on the same first connecting block are staggered in the upper and lower directions.

[0011] Furthermore, a second guide plate is included; a second guide plate is arranged on the left side of each fixing block, and each second guide plate is symmetrically arranged with the first connecting block adjacent to the right.

[0012] Furthermore, it also includes a second connecting block, a third connecting block, a scraper, a driving member and an extrusion plate; each second guide plate is rotatably connected to the adjacent fixed block through a torsion spring; a second connecting block is fixedly connected to the left side of each second guide plate; a third connecting block is fixedly connected to the left side of each second connecting block; a scraper for cleaning impurities is fixedly connected to the lower side of each second guide plate; a plurality of driving members are fixedly connected to the left side of the passivation tank; an extrusion plate is commonly fixedly connected to the output end between two adjacent driving members.

[0013] Furthermore, each scraper is made of elastic deformable material.

[0014] The beneficial effects are as follows: the present invention realizes guiding the passivation liquid through two first guide plates distributed in an eight-shaped shape, so that the passivation liquid flows to both sides of the galvanized steel plate, thereby increasing the flow rate of the passivation liquid between the first guide plate and the galvanized steel plate, flushing the bubbles attached to the front side and the rear side of the galvanized steel plate, thereby separating the bubbles from the surface of the galvanized steel plate, preventing the bubble area from blocking the passivation liquid from contacting the zinc layer, and avoiding the area from failing to form a complete protective film, which affects the continuity and uniformity of the passivation layer;

[0015] The second connecting rod drives two adjacent first guide plates to move, so that the angles of the two adjacent first guide plates can be changed according to the different thicknesses of the galvanized steel plates, ensuring that there is always a gap between each first guide plate and the galvanized steel plate, thereby preventing the first guide plate from being attached to the galvanized steel plate during the passivation process, thereby affecting the passivation effect;

[0016] By making the fixed block drive the first connecting block to move together, the defoaming agent can be flexibly adjusted according to the actual position and amount of foam generated on the surface of the galvanized steel plate, and flow with the passivation liquid and be evenly dispersed in the passivation tank, ensuring that every part of the passivation tank has sufficient defoaming efficiency;

[0017] The second connecting block and the third connecting block are squeezed by the squeezing plate, so that the scraper rotates left and right respectively, and the bottom of the passivation tank is cleaned and scraped to prevent impurities from remaining at the bottom of the passivation tank for a long time, resulting in uneven composition of the passivation liquid, affecting the full progress of the passivation reaction, and improving the quality of surface treatment and corrosion resistance of the galvanized steel plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the protective coating passivation device for galvanized steel plate processing of the present invention;

[0019] Figure 2 It is a cross-sectional view of a passivation tank of the present invention;

[0020] Figure 3 It is a schematic diagram of the combined three-dimensional structure of the fixing block and the first guide plate of the present invention;

[0021] Figure 4 It is a three-dimensional top view of the fixing rod and the first guide plate of the present invention;

[0022] Figure 5 It is a schematic diagram of the three-dimensional structure of the adapter assembly of the present invention;

[0023] Figure 6 It is a schematic diagram of the combined three-dimensional structure of the first connecting block and the second guide plate of the present invention;

[0024] Figure 7 It is a schematic diagram of the three-dimensional structure of the liquid inlet pipe and the first connecting block combined according to the present invention;

[0025] Figure 8 It is a top view of the combination of the galvanized steel plate, the first connecting block and the second guide plate of the present invention;

[0026] Fig. 9 It is a schematic diagram of the three-dimensional structure of the second guide plate, the second connecting block and the third connecting block combined according to the present invention;

[0027] Fig.10 It is a schematic diagram of the three-dimensional structure of the scraper and extrusion plate combination of the present invention.

[0028] In the accompanying drawings: 1-passivation tank, 1001-liquid inlet, 1002-liquid outlet, 1003-inclined surface, 2-fixed block, 3-fixed rod, 4-first guide plate, 5-galvanized steel plate, 101-slide rail, 102-electric slider, 201-cylinder, 202-first connecting rod, 203-second connecting rod, 301-liquid inlet pipe, 302-first connecting block, 30201-nozzle, 303-second guide plate, 401-second connecting block, 402-third connecting block, 403-scraper, 404-driving member, 405-extrusion plate. DETAILED DESCRIPTION

[0029] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Example 1

[0031] A protective coating passivation device for processing galvanized steel sheet 5, such as Figure 1-Figure 5 As shown, a passivation tank 1 is included; a liquid inlet 1001 is provided on the upper right side of the passivation tank 1; a liquid outlet 1002 is provided on the lower left side of the passivation tank 1, and the passivation liquid is added into the passivation tank 1 from the liquid inlet 1001, and then discharged from the liquid outlet 1002 and enters the circulation system, thereby realizing the recycling of the passivation liquid;

[0032] It also includes a driving component, a fixed block 2, a fixed rod 3, a first guide plate 4 and an adapter component; the driving component is installed in the passivation tank 1; four fixed blocks 2 are connected to the driving component, and the fixed blocks 2 are driven to move forward and backward by the driving component; four fixed rods 3 are arranged on each fixed block 2; two first guide plates 4 are installed on each fixed rod 3, and the combination of two adjacent first guide plates 4 is in an eight-shaped shape; an adapter component is installed on each fixed block 2.

[0033] A slope 1003 is provided at the bottom of the passivation tank 1 , and the side of the slope 1003 close to the liquid outlet 1002 is lower than the side close to the liquid inlet 1001 .

[0034] The driving assembly includes a slide rail 101 and an electric slider 102 ; two left-right symmetrical slide rails 101 are fixedly connected to the passivation tank 1 ; four electric sliders 102 are slidably connected to each slide rail 101 , and each fixed block 2 is fixedly connected to two adjacent electric sliders 102 .

[0035] The adapter assembly includes a cylinder 201, a first connecting rod 202 and a second connecting rod 203; each first guide plate 4 is rotatably connected to the adjacent fixed rod 3 through a torsion spring; two cylinders 201 are fixedly connected to the left and right sides of each fixed block 2, and the output ends of the cylinders 201 on the same side are respectively facing forward and backward; the output end of each cylinder 201 is slidably connected to a first connecting rod 202; the upper side of each first guide plate 4 is rotatably connected to a second connecting rod 203, and each second connecting rod 203 is slidably connected to the adjacent first connecting rod 202.

[0036] The working steps of this embodiment are:

[0037] A circulation system is usually configured in the existing passivation tank 1. The circulation system and filtration can timely remove impurities and sediments in the solution and slow down the aging of the solution. However, during the circulation of the passivation solution, the circulation system will bring outside air into the solution when discharging the passivation solution into the passivation tank 1, resulting in the formation of bubbles. The bubbles will adhere to the surface of the galvanized steel plate 5, thereby affecting the formation of a protective film on the surface of the galvanized steel plate 5, weakening its overall corrosion resistance, and shortening the service life of the product.

[0038] In the first step, according to the needs, an appropriate amount of galvanized steel plate 5 is hoisted by a hoisting device, and then the electric slider 102 is controlled to drive the fixed block 2, the fixed rod 3 and the first guide plate 4 to move back and forth on the slide rail 101, so that the interval between two adjacent fixed blocks 2 is sufficient to accommodate a galvanized steel plate 5.

[0039] In the second step, the passivating solution is then discharged into the inside of the passivating tank 1 from the liquid inlet 1001 of the passivating tank 1, until the passivating solution liquid level arrives at the lower side of the liquid inlet 1001, then the external circulation system communicated with the liquid outlet 1002 is started, the passivating solution in the passivating tank 1 enters the circulation system through the liquid outlet 1002 to filter and regulate, and then is discharged into the inside of the passivating tank 1 from the liquid inlet 1001 of the passivating tank 1, thus realizing the circulation of the passivating solution, by setting the liquid inlet 1001 height to be higher than the liquid outlet 1002, the passivating solution can be better diffused in the passivating tank 1, helping the passivating solution to be more evenly distributed in the whole passivating tank 1, and improving the efficiency of the passivation treatment.

[0040] By setting the inclined surface 1003 in the passivation tank 1 to be lower on the left and higher on the right, the impurities in the passivation tank 1 are guided so that the impurities can flow to the liquid outlet 1002 along with the circulating passivation liquid, thereby reducing the content of impurity accumulation and improving the impurity discharge effect.

[0041] In the third step, the hoisting device is then controlled to slowly immerse the galvanized steel plate 5 into the passivation tank 1 until all the galvanized steel plates 5 are immersed in the passivation solution. At this time, each fixed block 2 is located between adjacent galvanized steel plates 5, and the passivation solution in the passivation tank 1 is in a circulating state, flowing from the liquid inlet 1001 on the right side of the passivation tank 1 to the liquid outlet 1002 on the left side. Figure 4 As shown, the passivation liquid is guided by two first guide plates 4 distributed in an eight-shaped shape, so that the passivation liquid flows to the two sides of the galvanized steel plate 5, thereby increasing the flow rate of the passivation liquid between the first guide plate 4 and the galvanized steel plate 5, and flushing the bubbles attached to the front and rear sides of the galvanized steel plate 5, so that the bubbles are separated from the surface of the galvanized steel plate 5, and the bubble area is prevented from blocking the contact between the passivation liquid and the zinc layer, and the area is prevented from being unable to form a complete protective film, which affects the continuity and uniformity of the passivation layer. At the same time, when the flow rate of the passivation liquid passing between the galvanized steel plate 5 and the first guide plate 4 is increased, the solid impurities generated in the reaction process are further allowed to continue to move toward the liquid outlet 1002 with the passivation liquid, thereby facilitating the subsequent cleaning of the solid impurities, reducing the accumulation of solid impurities inside the passivation tank 1, and facilitating subsequent cleaning and maintenance.

[0042] The fourth step is to control the hoisting device to hoist the galvanized steel plate 5 out of the passivation tank 1 after the passivation is completed, thereby completing the passivation.

[0043] Taking into account the different thicknesses of the galvanized steel sheets 5, in order to improve the passivation efficiency, for thinner galvanized steel sheets 5, the electric slider 102 is controlled to reduce the interval between adjacent fixed blocks 2, and then the cylinder 201 is controlled to drive the corresponding first connecting rod 202 and the second connecting rod 203 to move toward the side of the fixed rod 3. Since the first guide plate 4 and the fixed rod 3 are rotatably connected, the second connecting rod 203 will drive the two adjacent first guide plates 4 away from one end of the fixed rod 3 to move closer to each other, thereby reducing the angle between the two adjacent first guide plates 4, so that the two adjacent first guide plates 4 can change their angles according to the different thicknesses of the galvanized steel sheets 5, ensuring that there is always a gap between each first guide plate 4 and the galvanized steel sheet 5, preventing the first guide plate 4 and the galvanized steel sheet 5 from fitting together during the passivation process, thereby affecting the passivation effect.

[0044] Example 2

[0045] On the basis of Example 1, Figure 1 , Figure 2 and Figure 6-Figure 10As shown, it also includes a liquid inlet pipe 301 and a first connecting block 302; each fixed block 2 is configured as a hollow structure, and a pump is provided in each fixed block 2; each fixed block 2 is filled with a defoaming agent; the right side of each fixed block 2 is connected to a liquid inlet pipe 301; each liquid inlet pipe 301 is fixedly connected to two first connecting blocks 302, and the combination of two adjacent first connecting blocks 302 is in an eight-shaped shape; each first connecting block 302 is provided with a plurality of nozzles 30201, and each nozzle 30201 is connected to the liquid inlet pipe 301 through a connecting pipe.

[0046] The nozzles 30201 located on the same first connecting block 302 are staggered in an up-and-down manner.

[0047] A second guide plate 303 is also included; a second guide plate 303 is disposed on the left side of each fixing block 2, and each second guide plate 303 is symmetrically disposed with the first connecting block 302 adjacent to the right.

[0048] It also includes a second connecting block 401, a third connecting block 402, a scraper 403, a driving member 404 and an extrusion plate 405; each second guide plate 303 is rotatably connected to the adjacent fixed block 2 through a torsion spring; the left side of each second guide plate 303 is fixedly connected to a second connecting block 401; the left side of each second connecting block 401 is fixedly connected to a third connecting block 402; the lower side of each second guide plate 303 is fixedly connected to a scraper 403; four driving members 404 are fixedly connected to the left side of the passivation tank 1, and the driving members 404 are electric push rods; the output ends between two adjacent driving members 404 are commonly fixedly connected to an extrusion plate 405.

[0049] Each scraper 403 is made of elastic deformable material.

[0050] The working principle of this embodiment is:

[0051] In the third step of Example 1: In the prior art, in order to eliminate the foam in the passivation tank 1, a defoamer solution is usually added directly into the passivation tank 1. However, this addition method causes the defoamer to be unable to be evenly mixed in the passivation solution, resulting in a general defoaming effect. At the same time, due to the setting of the circulation system, the added defoamer is discharged quickly along with the flow of the passivation solution, and cannot be in good contact with the galvanized steel plate 5 to eliminate the bubbles on the surface of the galvanized steel plate 5, resulting in low utilization and poor defoaming effect.

[0052] To solve the above problems, in the third step of Example 1: after the galvanized steel plate 5 is immersed in the passivation tank 1, according to the passivation requirements, the pump inside the fixed block 2 is started to transport the defoaming agent in the fixed block 2 to the fixed rod 3, and then sprayed out from the nozzle 30201 of the first connecting block 302. At this time, the defoaming agent will flow with the passivation liquid and be evenly dispersed in the passivation tank 1, ensuring that every part of the passivation tank 1 has sufficient defoaming efficiency. At the same time, compared with adding the defoaming agent once, the present application adopts a method of adding the defoaming agent following the flow of the passivation liquid, which can more accurately control the amount, reduce waste, and improve economic benefits. It can also make the defoaming agent better contact with the surface of the galvanized steel plate 5, thereby eliminating bubbles attached to the surface of the galvanized steel plate 5 and improving the bubble removal effect.

[0053] When the defoaming agent follows the passivation liquid and flows from one side of the first connecting block 302 to the second guide plate 303, as viewed from top to bottom, Figure 8 As shown, at this time, the passivation liquid and the defoaming agent are blocked by the second guide plate 303. Since the end of the second guide plate 303 is toward the lower side of the galvanized steel plate 5, the blocked passivation liquid and the defoaming agent will approach the lower side of the galvanized steel plate 5 along the end of the second guide plate 303, so that the defoaming agent can be in full and uniform contact with the galvanized steel plate 5, thereby ensuring that each foam pad can be acted upon by the defoaming agent, thereby further improving the treatment effect of the bubbles in the passivation tank 1 and on the surface of the galvanized steel plate 5.

[0054] It should be noted that although the circulating flow of the passivation liquid in the passivation tank 1 can drive most of the suspended impurities to move toward the liquid outlet 1002, there are still some impurities that will gradually settle and accumulate at the bottom of the passivation tank 1. Moreover, since the flow velocity of the passivation liquid at the liquid outlet 1002 is weakened, a large amount of impurities are accumulated here, and the impurities remain at the bottom of the passivation tank 1 for a long time, which will lead to uneven composition of the passivation liquid, thereby affecting the full progress of the passivation reaction, reducing the quality and corrosion resistance of the surface treatment of the galvanized steel plate 5, and making it inconvenient for subsequent cleaning work.

[0055] In order to solve the above problem, the driving member 404 located at the top is first controlled to drive the adjacent extrusion plate 405 to move toward the second connecting block 401 to squeeze the second connecting block 401. Since each second guide plate 303 is rotatably connected to the adjacent fixed block 2, the second connecting block 401 will drive the second guide plate 303 to rotate counterclockwise as a whole, and then drive the scraper 403 to rotate leftward to scrape the bottom of the passivation tank 1, thereby making the impurities deposited at the bottom of the passivation tank 1 float up and flow to the liquid outlet 1002 of the passivation tank 1 driven by the passivation liquid. Then, the driving member 404 located at the top is controlled to return to its original position, and the second guide plate 303 is moved under the action of the torsion spring. The second guide plate 303 is driven by the second connecting block 401 to rotate clockwise as a whole, and then the scraper 403 is driven to rotate rightward. The second connecting block 401 and the third connecting block 402 are respectively squeezed by the squeezing plates 405 located above and below, so that the scraper 403 is respectively rotated to the left and right, and the bottom of the passivation tank 1 is cleaned and scraped, so that the impurities deposited on the bottom of the passivation tank 1 float up and flow to the liquid outlet 1002 of the passivation tank 1 driven by the passivation liquid, thereby realizing the cleaning of the impurities at the bottom of the passivation tank 1.

[0056] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A protective coating passivation device for processing galvanized steel plates, comprising a passivation tank (1); a liquid inlet (1001) is arranged on the upper right side of the passivation tank (1); a liquid outlet (1002) is arranged on the lower left side of the passivation tank (1); the characteristics are: It also comprises a driving assembly, a fixed block (2), a fixed rod (3), a first guide plate (4) and an adaptor assembly; the driving assembly is installed in the passivation tank (1); a plurality of fixed blocks (2) are connected to the driving assembly; each fixed block (2) is provided with a plurality of fixed rods (3); each fixed rod (3) is provided with a plurality of first guide plates (4), and two adjacent first guide plates (4) are combined in an eight-shaped shape; each fixed block (2) is provided with an adaptor assembly for adapting to galvanized steel plates (5) of different thicknesses; The driving assembly comprises a slide rail (101) and an electric slider (102); two slide rails (101) are fixedly connected to the passivation tank (1) in a left-right symmetrical manner; four electric sliders (102) are slidably connected to each slide rail (101), and each fixed block (2) is fixedly connected to two adjacent electric sliders (102); The adapter assembly comprises a cylinder (201), a first connecting rod (202) and a second connecting rod (203); each first guide plate (4) is rotatably connected to an adjacent fixed rod (3) via a torsion spring; a plurality of cylinders (201) are fixedly connected to each fixed block (2), with two cylinders (201) forming a group, and the output ends of each group of two cylinders (201) are respectively facing forward and backward; the output end of each cylinder (201) is slidably connected to a first connecting rod (202); the upper side of each first guide plate (4) is rotatably connected to a second connecting rod (203), and each second connecting rod (203) is slidably connected to an adjacent first connecting rod (202); It also comprises a liquid inlet pipe (301) and a first connecting block (302); each fixed block (2) is configured as a hollow structure, and each fixed block (2) is provided with a pump; each fixed block (2) is filled with a defoaming agent for eliminating bubbles; the right side of each fixed block (2) is connected to a liquid inlet pipe (301); each liquid inlet pipe (301) is fixedly connected to a plurality of first connecting blocks (302), and two adjacent first connecting blocks (302) are combined to form an eight-shaped shape; each first connecting block (302) is provided with a plurality of nozzles (30201), and each nozzle (30201) is connected to the liquid inlet pipe (301) via a connecting pipe.

2. The protective coating passivation device for galvanized steel sheet processing according to claim 1 is characterized in that: A slope (1003) is provided at the bottom of the passivation tank (1), and a side of the slope (1003) close to the liquid outlet (1002) is lower than a side close to the liquid inlet (1001).

3. The protective coating passivation device for galvanized steel sheet processing according to claim 1 is characterized in that: The nozzles (30201) located on the same first connecting block (302) are distributed in an up-and-down staggered manner.

4. The protective coating passivation device for galvanized steel sheet processing according to claim 3 is characterized in that: It also includes a second guide plate (303); the left side of each fixing block (2) is provided with a second guide plate (303), and each second guide plate (303) is symmetrically arranged with the first connecting block (302) adjacent to the right.

5. A protective coating passivation device for galvanized steel sheet processing according to claim 4, characterized in that: It also comprises a second connecting block (401), a third connecting block (402), a scraper (403), a driving member (404) and an extrusion plate (405); each second guide plate (303) is rotatably connected to an adjacent fixed block (2) via a torsion spring; the left side of each second guide plate (303) is fixedly connected to a second connecting block (401); the left side of each second connecting block (401) is fixedly connected to a third connecting block (402); the lower side of each second guide plate (303) is fixedly connected to a scraper (403) for cleaning impurities; a plurality of driving members (404) are fixedly connected to the left side of the passivation tank (1); and the output end between two adjacent driving members (404) is commonly fixedly connected to an extrusion plate (405).

6. A protective coating passivation device for galvanized steel sheet processing according to claim 5, characterized in that: Each scraper (403) is made of elastic deformable material.

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