A passivation device for hot-dip galvanized steel sheet production

Abstract

This utility model discloses a passivation device for hot-dip galvanized sheet production. The device includes: a frame, a passivation tank, a lifting mechanism, a fixing device, a self-replenishing passivation liquid mechanism, and a passivation liquid supply device. The upper end of the frame is equipped with a fixing device for securing the hot-dip galvanized sheet, and the lower end is equipped with a passivation tank that can be raised and lowered via the lifting mechanism. The passivation tank contains a self-replenishing passivation liquid mechanism, and a passivation liquid supply device is also provided on one side of the frame for replenishing the passivation liquid to the passivation tank through the self-replenishing passivation liquid mechanism. This application overcomes the problem in the prior art where the passivation liquid continuously decreases during use, and drying accelerates this decrease, requiring frequent replenishment of the passivation tank. Otherwise, the galvanized sheet mounted on the fixing device cannot be submerged in the passivation liquid, affecting the passivation effect. Therefore, this invention provides a passivation device for hot-dip galvanized sheet production that can automatically replenish the passivation liquid.

Description

Technical Field

[0001] This utility model relates to the field of galvanized sheet technology, specifically to a passivation device for hot-dip galvanized sheet production. Background Technology

[0002] Passivation refers to the process of treating a metal with strong oxidizing agents or electrochemical methods to make the surface of the metal into an inactive state, which is a method to slow down the corrosion rate of the metal by transforming the metal surface into a state that is not easily oxidized.

[0003] Chinese Patent No. CN202323049836.4 discloses a passivation device for galvanized sheet production. A lifting rod can drive the passivation tank to move upward, so that the galvanized sheet on the filter screen is immersed in the passivation liquid in the passivation tank, thereby passivating the galvanized sheet. Excess passivation liquid on the galvanized sheet falls into the passivation tank under the action of gravity, so that the passivation tank can recycle and reuse the excess passivation liquid on the galvanized sheet.

[0004] The applicant discovered the following technical problems when implementing the above-mentioned technical solution:

[0005] During use, the passivation solution in this device is constantly decreasing, and drying will also accelerate the decrease of the passivation solution. It is necessary to replenish the passivation solution in the passivation tank frequently; otherwise, the galvanized plate set on the fixed device will not be able to be submerged in the passivation solution, which will affect the passivation effect.

[0006] Therefore, providing a passivation device for hot-dip galvanized sheet production that can automatically replenish passivation solution is a problem that this utility model urgently needs to solve. Utility Model Content

[0007] To address the aforementioned technical problems, the purpose of this invention is to overcome the fact that in existing devices, the passivation solution continuously decreases during use, and drying further accelerates this decrease. This necessitates frequent replenishment of the passivation solution into the passivation tank; otherwise, the galvanized sheet mounted on the fixed device cannot be submerged in the passivation solution, affecting the passivation effect. Therefore, this invention provides a passivation device for hot-dip galvanized sheet production that can automatically replenish the passivation solution.

[0008] To achieve the above object, the present utility model provides a passivation device for hot-dip galvanized sheet production. The device includes: a frame, a passivation tank, a lifting mechanism, a fixing device, a self-supplying passivation liquid mechanism, and a passivation liquid supply device. A fixing device for fixing the hot-dip galvanized sheet is provided at the upper end of the frame, and a passivation tank is provided at the lower end through the lifting mechanism in a liftable manner. A self-supplying passivation liquid mechanism is provided in the passivation tank, and a passivation liquid supply device for supplying passivation liquid into the passivation tank through the self-supplying passivation liquid mechanism is further provided on one side of the frame; wherein, the self-supplying passivation liquid mechanism includes: a three-way pipe, a moving plug, a floating ball, a rotating frame, and a first linkage rod. The three-way pipe is provided on one side of the top of the passivation tank, and one end of it is communicated with the passivation liquid supply device through a pipeline, one end is directed towards the bottom of the passivation tank, and the other end is horizontally directed towards the inside of the passivation tank. The moving plug is adapted to the inner diameter of the three-way pipe and is horizontally movably provided inside the three-way pipe. The rotating frame is in the shape of "factory", and its corner is rotatably provided at the end where the three-way pipe horizontally extends into the passivation tank. A floating ball that can float in the passivation liquid is provided at the end of the rotating frame away from the three-way pipe. One end of the first linkage rod is hinged to the end of the rotating frame close to the three-way pipe, and the other end is hinged to one end of the moving plug.

[0009] Preferably, a partition plate is provided in the passivation tank to divide it into two areas. A notch is provided at the bottom of the partition plate to connect the areas on both sides of the partition plate in the passivation tank. The self-supplying passivation liquid mechanism is provided in any one of the areas.

[0010] Preferably, a plurality of draining mechanisms are further provided at the open mouth of the passivation tank for draining the passivation liquid on the surface of the hot-dip galvanized sheet.

[0011] Preferably, the draining mechanism includes: a draining roller, a first moving block, and an elastic member. A plurality of guide rods are respectively horizontally provided on opposite sides of the passivation tank. Each guide rod is provided with a first moving block that can reciprocally move along its length direction. The opposite ends of the draining roller are respectively rotatably provided on the corresponding first moving blocks. The bottom side of the draining roller extends into the passivation liquid. The elastic member is sleeved on the guide rod, and one end of it abuts against the side wall of the first moving block, and the other end abuts against the passivation tank. First limit sliders are respectively provided on opposite sides of the first moving block, and first limit chutes corresponding to each first limit slider are provided on the frame.

[0012] Preferably, the lifting mechanism includes: a second moving block, a second linkage rod, and a driving component. Second moving blocks are respectively provided on opposite sides of the bottom of the frame through the driving component in a reciprocating and opposite moving manner. Each second moving block is respectively hinged to one end of the second linkage rod, and the other end of the second linkage rod is hinged to one side of the bottom of the passivation tank.

[0013] Preferably, the second movable block is provided with a second limiting slider, and the bottom of the frame is provided with a second limiting groove that is adapted to the second limiting slider.

[0014] Preferably, the drive assembly includes a rotary motor and a bidirectional lead screw, wherein the bidirectional lead screw has a horizontal thread passing through each moving block and is rotatably mounted on the frame by the rotary motor.

[0015] According to the above technical solution, the beneficial effects of this utility model compared with the prior art are as follows: This application hangs the hot-dip galvanized sheet on a fixed device, and then starts the lifting mechanism to drive the passivation tank to rise, so that the hot-dip galvanized sheet is immersed in the passivation liquid for passivation. Then, the lifting mechanism is started again to drive the passivation tank to fall. During this process, the hot-dip galvanized sheet will react with the passivation liquid, resulting in a reduction of the passivation liquid. At this time, the liquid level of the passivation liquid drops, and the float drops synchronously with the liquid level of the passivation liquid. The rotating frame will rotate around its rotating connection, thereby driving the moving plug to move through the first linkage rod. Since the moving plug is initially sealed in the three-way pipe facing the bottom of the passivation tank... At the outlet of the three-way pipe, the moving plug moves under the action of the first linkage rod, causing the outlet of the three-way pipe facing the bottom of the passivation tank to no longer be blocked. At this time, the passivation liquid supply device will supply passivation liquid into the passivation tank through this outlet. Thus, when the hot-dip galvanized sheet cannot be submerged in the passivation liquid, the passivation liquid can be automatically replenished into the passivation tank to ensure the passivation effect of the hot-dip galvanized sheet. The fixing device is specifically implemented by a wedge clamping mechanism. The passivation liquid supply device is specifically set up by a three-screw pump connected to the passivation liquid storage tank and the three-way pipe respectively. The fixing device and the passivation liquid supply device mentioned above are all existing technologies and will not be described in detail here. The specific structure is not shown in the figure.

[0016] Other features and advantages of this utility model will be described in detail in the following detailed description section; and all parts not covered in this utility model are the same as or can be implemented using existing technology. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0018] Figure 1 This is a three-dimensional representation of a passivation device for hot-dip galvanized sheet production provided in a preferred embodiment of the present invention. Figure 1 ;

[0019] Figure 2 This is a plan view of a passivation device for hot-dip galvanized sheet production provided in a preferred embodiment of this utility model;

[0020] Figure 3This is a three-dimensional representation of a passivation device for hot-dip galvanized sheet production provided in a preferred embodiment of the present invention. Figure 2 ;

[0021] Figure 4 This is a partial perspective view of a passivation device for hot-dip galvanized sheet production provided in a preferred embodiment of this utility model;

[0022] Figure 5 This is a partial planar cross-section of a passivation apparatus for hot-dip galvanized sheet production provided in a preferred embodiment of the present invention. Figure 1 ;

[0023] Figure 6 This is a partial planar cross-section of a passivation apparatus for hot-dip galvanized sheet production provided in a preferred embodiment of the present invention. Figure 2 ;

[0024] Figure 7 This is a partial planar cross-section of a passivation apparatus for hot-dip galvanized sheet production provided in a preferred embodiment of the present invention. Figure 3 .

[0025] Explanation of reference numerals in the attached drawings: 1-Frame; 101-Second limiting slide groove; 2-Passivation tank; 201-Separator plate; 202-Notch; 203-Guide rod; 204-First limiting slide groove; 3-Lifting mechanism; 301-Second moving block; 30101-Second limiting slider; 302-Second linkage rod; 303-Drive assembly; 30301-Rotary motor; 30302-Bidirectional lead screw; 4-Fixing device; 5-Self-replenishing passivation liquid mechanism; 501-T-connector pipe; 502-Moving plug; 503-Float ball; 504-Rotating frame; 505-First linkage rod; 6-Draining mechanism; 601-Draining roller; 602-First moving block; 60201-First limiting slider; 603-Elastic element. Detailed Implementation

[0026] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0027] In the description of the embodiments of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the utility model product is in use. These are merely for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model. Furthermore, the terms "first," "second," and "third," etc., are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance. Additionally, the terms "horizontal," "vertical," and "suspended," etc., do not indicate that the component is required to be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] To further understand the features, technical means, and specific objectives and functions achieved by this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments.

[0030] Reference Figure 1 , Figure 6 and Figure 7 A passivation device for hot-dip galvanized sheet production includes: a frame 1, a passivation tank 2, a lifting mechanism 3, a fixing device 4, a self-replenishing passivation liquid mechanism 5, and a passivation liquid supply device. The upper end of the frame 1 is equipped with the fixing device 4 for fixing the hot-dip galvanized sheet, and the lower end is equipped with the passivation tank 2, which is vertically movable via the lifting mechanism 3. The passivation tank 2 is equipped with the self-replenishing passivation liquid mechanism 5. A passivation liquid supply device is also provided on one side of the frame 1 for replenishing the passivation liquid into the passivation tank 2 through the self-replenishing passivation liquid mechanism 5.

[0031] The self-supplying passivation liquid mechanism 5 includes: a three-way pipe 501, a moving plug 502, a floating ball 503, a rotating frame 504, and a first linkage rod 505. The three-way pipe 501 is arranged on one side of the top of the passivation tank 2, and one end of it is connected to the passivation liquid supply device through a pipeline, one end is arranged towards the bottom of the passivation tank 2, and the other end is horizontally arranged towards the inside of the passivation tank 2. The moving plug 502 is adapted to the inner diameter of the three-way pipe 501 and is horizontally movably arranged inside the three-way pipe 501. The rotating frame 504 is in the shape of "厂", and its corner is rotatably arranged at one end of the three-way pipe 501 horizontally extending into the passivation tank 2. A floating ball 503 that can float in the passivation liquid is arranged at the end of the rotating frame 504 far from the three-way pipe 501. One end of the first linkage rod 505 is hinged to one end of the rotating frame 504 close to the three-way pipe 501, and the other end is hinged to one end of the moving plug 502.

[0032] In this application, the hot-dip galvanized sheet is hung on the fixing device 4, and then the lifting mechanism 3 is started to drive the passivation tank 2 to rise, so that the hot-dip galvanized sheet is immersed in the passivation liquid for passivation. Then, the lifting mechanism 3 is started again to drive the passivation tank 2 to descend. During this process, the hot-dip galvanized sheet will react with the passivation liquid, resulting in the reduction of the passivation liquid. At this time, the liquid level of the passivation liquid drops, and the floating ball 503 drops synchronously with the liquid level of the passivation liquid. The rotating frame 504 will rotate around its rotating connection, and thus the moving plug 502 is driven to move through the first linkage rod 505. Since the moving plug 502 blocks the water outlet at one end of the three-way pipe 501 facing the bottom of the passivation tank 2 in the initial state, the moving plug 502 moves under the action of the first linkage rod 505, resulting in the water outlet at one end of the three-way pipe 501 facing the bottom of the passivation tank 2 no longer being blocked. At this time, the passivation liquid supply device will supply passivation liquid into the passivation tank 2 through this water outlet; thus, when the hot-dip galvanized sheet cannot be immersed in the passivation liquid, the passivation liquid can be automatically supplemented into the passivation tank 2 to ensure the passivation effect of the hot-dip galvanized sheet; the fixing device 4 is specifically realized through a wedge clamping mechanism; the passivation liquid supply device is specifically connected to the passivation liquid storage tank and the three-way pipe 501 through a three-screw pump respectively; the above-mentioned fixing device 4 and passivation liquid supply device are both prior arts and will not be elaborated here, and the specific structures are not shown in the figure.

[0033] Refer to Figure 4 and Figure 5 : A partition plate 201 is arranged in the passivation tank 2 to divide it into two areas. A notch 202 is arranged at the bottom of the partition plate 201 to connect the areas on both sides of the partition plate 201 in the passivation tank 2. The self-supplying passivation liquid mechanism 5 is arranged in any one of the areas.

[0034] This application uses a design to divide the passivation tank 2 into a passivation working area and a liquid level control area. One area is used to passivate the hot-dip galvanized sheet. The partition plate 201 has a 10-15cm gap 202 left from the bottom of the tank, so that the liquid levels in the two areas can be automatically balanced but physically isolated. The other area ensures that the passivation liquid can cover the hot-dip galvanized sheet through the self-replenishing passivation liquid mechanism 5. The two areas are separated by the partition plate 201 and work independently to prevent the hot-dip galvanized sheet from colliding with the self-replenishing passivation liquid mechanism 5 and causing damage when the passivation tank 2 is driven by the lifting mechanism 3. At the same time, it can also reduce the impact of liquid level disturbance caused by the hot-dip galvanized sheet entering and leaving the passivation tank 2 on the float 503, thereby affecting the normal operation of the self-replenishing passivation liquid mechanism 5.

[0035] Reference Figures 1-5 The passivation pool 2 is also equipped with several draining mechanisms 6 at its opening to drain the passivation liquid from the surface of the hot-dip galvanized sheet.

[0036] The draining mechanism 6 includes a draining roller 601, a first moving block 602, and an elastic element 603. Several guide rods 203 are horizontally arranged on opposite sides of the passivation pool 2. A first moving block 602 is reciprocally arranged on each guide rod 203 along its length. The draining roller 601 is rotatably mounted on the corresponding first moving block 602 at opposite ends. The bottom side of the draining roller 601 extends into the passivation liquid. The elastic element 603 is sleeved on the guide rod 203, with one end abutting against the side wall of the first moving block 602 and the other end abutting against the passivation pool 2. First limiting sliders 60201 are arranged on opposite sides of the first moving block 602. The frame 1 is provided with a first limiting groove 204 corresponding to each first limiting slider 60201.

[0037] When the passivation tank 2 of this application rises under the drive of the lifting mechanism 3, the hot-dip galvanized sheet enters the passivation tank 2 through the squeezing of the two relative drain rollers 601. The drain rollers 601 rotate under the action of the hot-dip galvanized sheet. Since the bottom side of the drain rollers 601 extends into the passivation liquid, the passivation liquid is evenly coated on the hot-dip galvanized sheet during the rotation process. When the passivation tank 2 descends under the drive of the lifting mechanism 3, the hot-dip galvanized sheet is squeezed by the drain rollers 601 on both sides to passivate the surface of the hot-dip galvanized sheet. Excess passivation liquid is drained to improve the utilization rate of passivation liquid and accelerate the drying process of hot-dip galvanized sheet; the draining roller 601 can be made of materials such as hydrogenated nitrile rubber, fluororubber, polytetrafluoroethylene composite layer, and silicon carbide ceramic coating. These materials have strong corrosion resistance, uniform liquid film transfer, zero adsorption residue, and strong liquid repellency; the first moving block 602 is reciprocally mounted in the second limiting slide groove 101 through the second limiting slider 30101 to ensure stable movement and prevent deviation.

[0038] Reference Figure 2The lifting mechanism 3 includes a second moving block 301, a second linkage rod 302, and a drive assembly 303. The bottom of the frame 1 is provided with second moving blocks 301 on opposite sides, which can be moved back and forth in opposite directions by the drive assembly 303. Each second moving block 301 is hinged to one end of the second linkage rod 302, and the other end of the second linkage rod 302 is hinged to one side of the bottom of the passivation tank 2.

[0039] This application activates the drive component 303 to drive each second moving block 301 to move back and forth in opposite directions, thereby driving the passivation pool 2 to rise or fall via the second linkage rod 302.

[0040] Reference Figure 3 The second moving block 301 is provided with a second limiting slider 30101, and the bottom of the frame 1 is provided with a second limiting groove 101 that is adapted to the second limiting slider 30101.

[0041] The movable block of this application is reciprocally mounted in the second limiting slide groove 101 via the second limiting slider 30101 to ensure stable movement and prevent deviation.

[0042] Reference Figure 3 The drive assembly 303 includes a rotary motor 30301 and a bidirectional lead screw 30302. The bidirectional lead screw 30302 has a horizontal thread that passes through each moving block and is rotatably mounted on the frame 1 via the rotary motor 30301.

[0043] This application starts the rotary motor 30301 to drive the bidirectional lead screw 30302 to rotate, thereby driving each moving block to move in opposite directions, and thus driving the passivation tank 2 to rise or fall through the first linkage rod 505.

[0044] In use, the device provided by this utility model involves hanging a hot-dip galvanized sheet on a fixed device 4, then activating a lifting mechanism 3 to raise the passivation tank 2, allowing the hot-dip galvanized sheet to be submerged in the passivation solution for passivation. Then, the lifting mechanism 3 is activated again to lower the passivation tank 2. During this process, the hot-dip galvanized sheet reacts with the passivation solution, causing the amount of passivation solution to decrease. As the level of the passivation solution drops, the float 503 descends synchronously with the level of the passivation solution, and the rotating frame 504 rotates around its rotating connection point. This, in turn, moves the moving plug 502 via the first linkage rod 505. Initially, the moving plug 502 is sealed at the outlet of the three-way pipe 501 facing the bottom of the passivation tank 2. The movable plug 502 moves under the action of the first linkage rod 505, causing the outlet of the three-way pipe 501 facing the bottom of the passivation tank 2 to no longer be blocked. At this time, the passivation liquid supply device will supply passivation liquid into the passivation tank 2 through the outlet. Thus, when the hot-dip galvanized sheet cannot be submerged in the passivation liquid, the passivation liquid can be automatically replenished into the passivation tank 2 to ensure the passivation effect of the hot-dip galvanized sheet. The fixing device 4 is specifically implemented by a wedge clamping mechanism. The passivation liquid supply device is specifically connected to the passivation liquid storage tank and the three-way pipe 501 respectively through a three-screw pump. The fixing device 4 and the passivation liquid supply device mentioned above are all existing technologies and will not be described in detail here. The specific structure is not shown in the figure.

[0045] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0046] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

[0047] Furthermore, various different embodiments of this utility model can be combined in any way, as long as they do not violate the spirit of this utility model, they should also be regarded as the content disclosed by this utility model.

Claims

1. A passivation device for hot-dip galvanized sheet production, characterized in that, The device includes: a frame (1), a passivation tank (2), a lifting mechanism (3), a fixing device (4), a self-supplying passivation liquid mechanism (5), and a passivation liquid supply device. At the upper end of the frame (1), there is a fixing device (4) for fixing the hot-dip galvanized sheet. At the lower end, there is a passivation tank (2) which is arranged to be liftable through the lifting mechanism (3). Inside the passivation tank (2), there is a self-supplying passivation liquid mechanism (5). On one side of the frame (1), there is also a passivation liquid supply device for supplying passivation liquid into the passivation tank (2) through the self-supplying passivation liquid mechanism (5); where, The self-supplying passivation liquid mechanism (5) includes: a three-way pipe (501), a moving plug (502), a floating ball (503), a rotating frame (504), and a first linkage rod (505). The three-way pipe (501) is arranged on one side of the top of the passivation tank (2), and one end of it is connected to the passivation liquid supply device through a pipeline. One end is directed towards the bottom of the passivation tank (2), and the other end is horizontally directed towards the inside of the passivation tank (2). The moving plug (502) is adapted to the inner diameter of the three-way pipe (501) and is horizontally movably arranged inside the three-way pipe (501). The rotating frame (504) is in the shape of "厂", and its corner is rotatably arranged at the end where the three-way pipe (501) horizontally extends into the passivation tank (2). At the end of the rotating frame (504) away from the three-way pipe (501), there is a floating ball (503) that can float in the passivation liquid. One end of the first linkage rod (505) is hinged to the end of the rotating frame (504) close to the three-way pipe (501), and the other end is hinged to one end of the moving plug (502).

2. The passivation device for hot-dip galvanized sheet production according to claim 1, characterized in that, Inside the passivation tank (2), there is a partition plate (201) to divide it into two areas. At the bottom of the partition plate (201), there is a notch (202) to connect the areas on both sides of the partition plate (201) in the passivation tank (2). The self-supplying passivation liquid mechanism (5) is arranged in any one of the areas.

3. The passivation device for hot-dip galvanized sheet production according to claim 1, characterized in that, At the open end of the passivation tank (2), there are also several draining mechanisms (6) for draining the passivation liquid on the surface of the hot-dip galvanized sheet.

4. The passivation device for hot-dip galvanized sheet production according to claim 3, characterized in that, The draining mechanism (6) includes: a draining roller (601), a first moving block (602), and an elastic member (603). On opposite sides of the passivation tank (2), several guide rods (203) are horizontally arranged respectively. On each guide rod (203), there is a first moving block (602) that can reciprocally move along its length direction. Opposite ends of the draining roller (601) are rotatably arranged on the corresponding first moving blocks (602). The bottom side of the draining roller (601) extends into the passivation liquid. The elastic member (603) is sleeved on the guide rod (203), and one end of it abuts against the side wall of the first moving block (602), and the other end abuts against the passivation tank (2). On opposite sides of the first moving block (602), there are first limiting sliders (60201) respectively. On the frame (1), there are first limiting chutes (204) corresponding to each first limiting slider (60201) one by one.

5. The passivation device for hot-dip galvanized sheet production according to claim 1, characterized in that, The lifting mechanism (3) includes: a second moving block (301), a second linkage rod (302) and a drive assembly (303). The bottom of the frame (1) is provided with second moving blocks (301) on opposite sides, which can be moved back and forth in opposite directions by the drive assembly (303). Each second moving block (301) is hinged to one end of the second linkage rod (302), and the other end of the second linkage rod (302) is hinged to one side of the bottom of the passivation tank (2).

6. The passivation device for hot-dip galvanized sheet production according to claim 5, characterized in that, The second moving block (301) is provided with a second limiting slider (30101), and the bottom of the frame (1) is provided with a second limiting groove (101) that is adapted to the second limiting slider (30101).

7. The passivation device for hot-dip galvanized sheet production according to claim 6, characterized in that, The drive assembly (303) includes a rotary motor (30301) and a bidirectional lead screw (30302), wherein the bidirectional lead screw (30302) has a horizontal thread passing through each moving block and is rotatably mounted on the frame (1) via the rotary motor (30301).

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