Galvanized pipe high-humidity environment corrosion-resistant compound film forming device and method

Abstract

The invention discloses a galvanized pipe high-humidity environment corrosion-resistant compound film forming device and method, and belongs to the technical field of galvanized pipe high-humidity environment corrosion-resistant compound film forming. The galvanized pipe high-humidity environment corrosion-resistant compound film forming device comprises a machining support and a passivation tank installed on the machining support, a protective cover is fixedly installed above the passivation tank, and a spraying pipe is installed in the protective cover; a discharging pipe communicated with the spraying pipe is fixed outside the protective cover; a batching tank is fixed in the middle of the bottom of the passivation tank, a feeding pipe is connected between the batching tank and the passivation tank in a penetrating manner, and a batching mechanism for adjusting the concentration, temperature and pH value of liquid in the passivation tank is arranged in the batching tank; a vertical sliding strip is fixedly mounted on the inner wall of the passivation tank, a lifting frame is mounted on the vertical sliding strip in a clamped and sliding manner, a filter screen plate is mounted in the lifting frame in an embedded manner, and a cleaning mechanism for cleaning isolators on the filter screen plate in a rolling manner is arranged on the lifting frame; the device can automatically supplement the passivation solution, regulate and control the concentration, the temperature and the pH value of the passivation solution and maintain the passivation film forming quality.

Description

Technical Field

[0001] This invention relates to the field of corrosion-resistant compound film formation technology for galvanized pipes in high humidity environments, specifically to an apparatus and method for forming corrosion-resistant compound films on galvanized pipes in high humidity environments. Background Technology

[0002] The zinc coating process for galvanized pipes involves reacting a passivation solution with the zinc coating layer to form a dense, corrosion-resistant passivation film. The passivation process includes two methods: spraying and immersion. In the latter, the passivation solution is sprayed onto the surface of the galvanized pipe, causing a chemical reaction between the passivation solution and the zinc layer to form a passivation film. The ratio of the passivation solution has a significant impact on the quality of the passivation film formation.

[0003] For example, patent CN222499370U discloses a passivation tank for galvanizing, including a placement mesh tank and a sealing mesh plate. The bottom of the placement mesh tank has a symmetrically shaped discharge port, and a matching sealing mesh plate is provided outside the discharge port. The sealing mesh plates are hinged to the bottom of the placement mesh tank on one side. A rotating plate is connected to the bottom of the placement mesh tank with damping rotation. The two ends of the rotating plate correspond to the sealing mesh plate. A threaded knob is threaded through the eccentric part of the rotating plate. A winch, in conjunction with a vertical plate, is used to lift and lower the frame, facilitating the placement of the mesh tank into the passivation tank for passivation or removing it from the passivation tank. When the placement mesh tank is lifted, a receiving container is placed above the passivation tank to receive it. By loosening the threaded knob and rotating the rotating plate, the sealing mesh plate naturally opens under gravity, allowing the passivated workpiece in the mesh tank to fall out and be discharged, thus facilitating material removal.

[0004] For example, patent CN223292642U discloses a hot-dip galvanizing chromium-free passivation tank, which includes a tank body, a protective component, and a protective shell. The protective component is located on the tank body and includes a bellows cover that covers the top of the tank body for protection. The protective shell is located on the tank body and includes a protective cover that protects the folded bellows cover. This solves the problem that when the passivation tank is not used, external dust, impurities, and other external pollutants will enter the passivation tank, which will contaminate the cleanliness of the passivation solution and affect its effectiveness.

[0005] For example, patent CN218842329U discloses a passivation tank for galvanizing, including a base plate, a passivation tank, and a support. The passivation tank is fixedly connected to the top of the base plate, and the support is fixedly connected to the four corners of the top of the base plate, located at the top of the passivation tank. Limiting rods are fixedly connected to the four corners of the bottom of the support. In this passivation tank for galvanizing, the rotation of a first motor drives a rotating shaft to rotate, causing a cam to rotate. The cam periodically presses against a moving plate, causing the moving plate to move back and forth, which in turn drives a connecting rod to move back and forth, causing a stirring plate to longitudinally stir the passivation solution. Simultaneously, the rotation of the rotating shaft drives a drive wheel to rotate, which in turn drives a driven wheel to rotate via a transmission belt, causing the transmission shaft to drive a stirring plate to rotate, thereby stirring the passivation solution and making it more uniform. To improve the passivation effect and avoid affecting product quality, during the passivation process, effective components such as chromium ions and phosphate ions will continuously react with the zinc layer and be consumed. If they are not replenished in time, the passivation film will become thinner, have poor gloss, or even fail to form a film. Moreover, the pH value and temperature of the passivation solution have a significant impact on the film formation reaction efficiency and film quality. Some existing passivation tanks are not convenient for independent monitoring and control of the concentration, pH value, and temperature of the passivation solution, resulting in poor film quality in the later stages of use. In addition, the passivation solution recovered by spraying will be mixed with solid impurities such as zinc powder and oxide scale that have fallen off the surface of the galvanized pipe. If it is reused without treatment, the impurities will adhere to the pipe surface, causing spots, pinholes, and scratches on the passivation film. The film layer is not dense and loses its uniform anti-corrosion protection, further reducing the film quality.

[0006] To address the aforementioned issues, there is an urgent need for innovative design based on the existing galvanized pipe high-humidity environment corrosion-resistant compound film-forming device. Summary of the Invention

[0007] The purpose of this invention is to provide an apparatus and method for forming a corrosion-resistant compound film on galvanized pipes in high-humidity environments. This addresses the problems mentioned in the background art, such as the inconvenience of independently monitoring and controlling the concentration, pH value, and temperature of the passivation solution in some existing passivation tanks, resulting in poor film quality in the later stages of use. Furthermore, the passivation solution recovered by spraying may contain solid impurities such as zinc powder and oxide scale that have detached from the surface of the galvanized pipe. If these are reused without treatment, the impurities will adhere to the pipe surface, causing spots, pinholes, and scratches on the passivation film. The film layer is not dense and loses its uniform anti-corrosion protection, further reducing the quality of the film formation.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A device for forming a corrosion-resistant compound film on galvanized pipe in a high-humidity environment includes a processing support and a passivation tank mounted on the processing support. A protective cover is fixedly installed above the passivation tank, and a spray pipe is installed inside the protective cover. A discharge pipe communicating with the spray pipe is fixed outside the protective cover, and the other end of the discharge pipe is connected to the bottom of the passivation tank. A discharge pump is installed on the discharge pipe. A mixing tank is fixedly installed in the center of the bottom of the passivation tank. A feed pipe is connected between the mixing tank and the passivation tank. A feed pump is installed on the feed pipe. The mixing tank is equipped with a mixing mechanism to adjust the concentration, temperature, and pH value of the liquid inside the passivation tank. A vertical slide is fixedly installed on the inner wall of the passivation tank. A lifting frame is engaged and slidably installed on the vertical slide. A filter screen is embedded in the lifting frame, and a cleaning mechanism for rolling and cleaning the separators on the filter screen is provided on the lifting frame.

[0010] Preferably, the batching mechanism includes multiple batching pipes connected to the side of the batching tank, and a return pipe is connected between the batching tank and the passivation tank, with a drain pipe connected to the return pipe to discharge excess liquid from the passivation tank.

[0011] Preferably, the mixing tank is equipped with a cooling curved pipe for controlling the temperature of the mixing liquid, and a lower stirring rod is rotatably connected to the inside of the mixing tank along the axial direction; an upper stirring rod is rotatably connected to the bottom surface of the passivation tank, and the upper stirring rod is fixedly connected to the lower stirring rod.

[0012] Preferably, a rotating column is fixedly connected above the upper stirring rod along the axial direction. Two sets of opposite curved grooves are opened on the outer wall of the rotating column. A sliding support rod is slidably connected in the curved groove and the sliding support rod is fixedly installed on the surface of the lifting frame.

[0013] Preferably, a liquid level sensor, a temperature sensor, and a pH meter are fixedly installed on the inner wall of the passivation tank. Two sets of inclined guide plates are symmetrically fixed on both sides of the inner wall of the passivation tank along the protective cover. A cylinder is fixedly installed at the bottom of the guide plate, and a lifting column is fixedly installed at the output end of the cylinder. The lifting column is fixedly installed on the lifting frame.

[0014] Preferably, the cleaning mechanism includes a side plate fixedly installed on the edge of the upper surface of the lifting frame. A horizontal groove is opened on the side plate, and a moving block is slidably installed in the groove. A decontamination component is rotatably installed on the moving block and is attached to the surface of the filter plate.

[0015] Preferably, a movable bracket is fixedly installed on the movable block, a transmission support rod is rotatably connected to the movable bracket, a fixed block is fixedly installed on the inner wall of the passivation groove, and the fixed block is rotatably connected to the other end of the transmission support rod.

[0016] Preferably, the decontamination assembly includes three sets of cylindrical tubes rotatably mounted on a movable block, with rollers arranged between the three sets of adjacent cylindrical tubes, and a strip groove provided on the upper surface of the lifting frame to allow the rollers to roll; an adhesive layer is bonded to the outside of the cylindrical tubes.

[0017] Preferably, a sensing block is slidably fitted onto the cylindrical tube, a fixed frame is fixedly connected inside the cylindrical tube, a telescopic rod is slidably connected through the fixed frame, the telescopic rod is fixedly connected to the sensing block, and a limit spring is elastically connected between the sensing block and the fixed frame; a pressure sensor is fitted and fixedly fitted into the fixed frame, and the position of the pressure sensor corresponds to the position of the telescopic rod.

[0018] A method for forming a corrosion-resistant compound film on galvanized pipes in a high-humidity environment, using the aforementioned apparatus for forming a corrosion-resistant compound film on galvanized pipes in a high-humidity environment, the film forming method includes the following steps:

[0019] S1. Prepare passivation solution: Based on the performance requirements of the zinc coating on the surface of the galvanized pipe, prepare a liquid with appropriate concentration, temperature and pH in the mixing tank and transfer it to the passivation tank. The passivation solution in the passivation tank can be automatically added during the processing.

[0020] S2. Filtering the liquid in the passivation tank: During the passivation process, the liquid in the passivation tank is filtered, and the isolated impurities are rolled and bound to ensure the quality of the passivation liquid in the passivation tank.

[0021] S3. Passivation film formation: The discharge pump is operated to control the liquid in the passivation tank to enter the spray pipe. The pipe is set below the spray pipe, and the spray pipe sprays the passivation liquid to cover the outside of the pipe. The passivation time is controlled so that a zinc coating layer is formed on the outer wall of the pipe.

[0022] Compared with the prior art, the beneficial effects of the present invention are: the device and method for forming a corrosion-resistant compound film in a high-humidity environment for galvanized pipes can sense changes in the passivation solution in real time through a liquid level sensor, a temperature sensor and an acid-base detector, and, in conjunction with the production time, replenish raw materials in a timely manner through a mixing tank, controlling the concentration, pH value and temperature of the passivation solution in the passivation tank, so as to maintain its ability to effectively passivate and form a film on the outside of the pipe and improve the film quality.

[0023] The mixing tank is equipped with a mixing mechanism to adjust the concentration, temperature, and pH of the liquid inside the passivation tank. Based on the changes in the concentration, temperature, and pH of the passivation solution during the production process, raw materials are added to the mixing tank autonomously through the mixing pipe. The raw materials in the mixing tank are cooled and controlled by the cooling concave pipe, and the liquid in the mixing tank is mixed by the lower stirring rod. The stock solution with the appropriate temperature, concentration, and pH is fed into the passivation tank through the feed pipe, thus achieving the purpose of autonomously adjusting the passivation solution.

[0024] As the passivation time of the pipeline increases, the temperature of the recovered passivation solution gradually rises. At this time, the liquid in the passivation tank can be controlled to flow back to the mixing tank through the return pipe. Inside the mixing tank, the passivation solution can be fully stirred and cooled. The cooled passivation solution re-enters the passivation tank through the feed pipe to maintain the processing temperature of the passivation solution.

[0025] The passivation tank is equipped with a filter screen. After a large amount of spray liquid is recovered, the passivation liquid in the passivation tank carries some solid impurities, which will contaminate the prepared passivation liquid. Through the isolation effect of the filter screen, the passivation liquid in the passivation tank can be filtered to prevent the passivation liquid entering the spray pipe from containing a large number of solid particles, which would cause film defects.

[0026] The lifting frame is equipped with a cleaning mechanism that cleans the separators on the filter screen plate by rolling. During the process of filtering the liquid inside the passivation tank, the cleaning component is controlled to roll on the surface of the filter screen plate, which can effectively adhere to the solid impurities on the surface of the filter screen plate, reducing the amount of impurities mixed in the passivation liquid. The impurities are attached to the surface of the adhesive layer, which can be removed from the outside of the cylindrical tube for replacement at regular intervals, making it convenient to use.

[0027] A sensing block is slidably fitted onto the cylindrical tube. During the rolling process of cleaning solid impurities on the surface of the filter screen, if the sensing block is continuously squeezed and triggers the pressure sensor, the isolation thickness of solid impurities on the filter screen can be determined based on the triggering situation. This allows for the determination of the content of mixed solid impurities in the passivation solution. If necessary, manual cleaning of the impurities filtered out in the passivation tank is required to maintain the quality of the passivation film formation process. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the passivation groove structure of the present invention.

[0029] Figure 2 This is a schematic diagram of the cross-sectional structure of the protective cover of the present invention.

[0030] Figure 3 This is a schematic diagram of the cross-sectional structure of the passivation groove of the present invention.

[0031] Figure 4 This is a schematic diagram of the guide plate structure of the present invention.

[0032] Figure 5 This is a schematic diagram of the mixing tank structure of the present invention.

[0033] Figure 6 This is a schematic diagram of the stirring rod structure of the present invention.

[0034] Figure 7 This is a schematic diagram of the lifting frame and filter plate structure of the present invention.

[0035] Figure 8 This is a schematic diagram of the transmission support rod structure of the present invention.

[0036] Figure 9 This is a schematic diagram of the rotating column structure of the present invention.

[0037] Figure 10 This is a schematic diagram of the cylindrical tube structure of the present invention.

[0038] Figure 11 This is a schematic diagram of the adhesive layer structure of the present invention.

[0039] Figure 12 This is a schematic diagram of the induction block structure of the present invention.

[0040] Figure 13 This is a schematic diagram of the pressure sensor structure of the present invention.

[0041] In the diagram: 1. Processing support; 2. Passivation tank; 3. Protective cover; 4. Spray pipe; 5. Discharge pipe; 6. Discharge pump; 7. Batching tank; 71. Batching pipe; 72. Return pipe; 73. Drain pipe; 74. Cooling curved pipe; 75. Lower stirring rod; 8. Feed pipe; 9. Feed pump; 10. Liquid level sensor; 11. Temperature sensor; 12. pH meter; 13. Guide plate; 14. Upper stirring rod; 141. Rotating column; 142. Curved groove; 143. Sliding support rod; 15. Vertical sliding bar; 16. Lifting frame; 161. Lifting column; 162. Cylinder; 163. Strip groove; 17. Filter screen plate; 18. Stain removal assembly; 181. Cylindrical tube; 182. Roller; 183. Adhesive layer; 184. Sensing block; 185. Fixing frame; 186. Telescopic rod; 187. Limiting spring; 188. Pressure sensor; 19. Side plate; 20. Horizontal groove; 21. Moving block; 22. Moving bracket; 23. Fixing block; 24. Transmission support rod. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] Example 1: Please refer to Figures 1-7The present invention provides the following technical solution: a galvanized pipe high humidity environment corrosion-resistant compound film forming device, including a processing support 1 and a passivation tank 2 installed on the processing support 1. A protective cover 3 is fixedly installed above the passivation tank 2. A spray pipe 4 is installed in the protective cover 3. A discharge pipe 5 communicating with the spray pipe 4 is fixed outside the protective cover 3. The other end of the discharge pipe 5 is connected to the bottom of the passivation tank 2, and a discharge pump 6 is installed on the discharge pipe 5. A mixing tank 7 is fixedly fixed in the center of the bottom of the passivation tank 2. A feed pipe 8 is connected between the mixing tank 7 and the passivation tank 2. A feed pump 9 is installed on the feed pipe 8. The mixing tank 7 is equipped with a mixing mechanism for adjusting the concentration, temperature and pH value of the liquid inside the passivation tank 2. A vertical slide bar 15 is fixedly installed on the inner wall of the passivation tank 2. A lifting frame 16 is engaged and slidably installed on the vertical slide bar 15. A filter screen plate 17 is embedded in the lifting frame 16, and a cleaning mechanism for rolling and cleaning the isolation material on the filter screen plate 17 is provided on the lifting frame 16.

[0044] Please see Figures 3-6 The batching mechanism includes multiple batching pipes 71 connected to the side of the batching tank 7, and a return pipe 72 is connected between the batching tank 7 and the passivation tank 2. A drain pipe 73 is connected to the return pipe 72 to drain excess liquid from the passivation tank 2. A cooling curved pipe 74 for controlling the temperature of the batching liquid is installed inside the batching tank 7, and a lower stirring rod 75 is rotatably connected to the inside of the batching tank 7 along the axial direction. An upper stirring rod 14 is rotatably connected to the bottom surface of the passivation tank 2, and the upper stirring rod 14 is fixedly connected to the lower stirring rod 75.

[0045] Please see Figure 3 , Figures 7-9 A rotating column 141 is fixedly connected above the upper stirring rod 14 along the axial direction. Two sets of opposing curved grooves 142 are opened on the outer wall of the rotating column 141. A sliding support rod 143 is slidably connected in the curved groove 142. The sliding support rod 143 is fixedly installed on the surface of the lifting frame 16. A liquid level sensor 10, a temperature sensor 11, and a pH detector 12 are fixedly installed on the inner wall of the passivation tank 2. Two sets of inclined guide plates 13 are symmetrically fixed on both sides of the inner wall of the passivation tank 2 along the protective cover 3. A cylinder 162 is fixedly installed at the bottom of the guide plate 13. A lifting column 161 is fixedly installed at the output end of the cylinder 162. The lifting column 161 is fixedly installed on the lifting frame 16.

[0046] An appropriate amount of passivation solution is added to the passivation tank 2. During processing, the discharge pump 6 is run to draw the passivation solution from the passivation tank 2, allowing the liquid to enter the spray pipe 4 through the discharge pipe 5 and be sprayed downwards through the spray pipe 4. The pipe is positioned below the spray pipe 4, and the sprayed passivation solution reacts chemically with the zinc layer on the pipe surface to form a passivation film. Excess passivation solution is recycled back into the passivation tank 2 through the guide plate 13, realizing the recycling of the passivation solution. As the passivation processing time increases, the concentration, pH value, and temperature of the passivation solution in the passivation tank 2 gradually fail to meet the production requirements. The original solution can be added to the passivation tank through the mixing tank 7. In tank 2, the passivation solution is replenished and adjusted in real time. During operation, the liquid is controlled to enter the mixing tank 7 through the mixing pipe 71 and connected to the cooling curved pipe 74. The coolant in the refrigeration system circulates in the cooling curved pipe 74. The liquid in the mixing tank 7 and the liquid in the cooling curved pipe 74 are cooled by heat exchange. At the same time, the stirring rod 75 is controlled to rotate to stir and mix the liquid in the mixing tank 7, keeping the liquid concentration and temperature uniform. After mixing, the feed pump 9 is run to transfer the liquid in the mixing tank 7 to the passivation tank 2 through the feed pipe 8 for replenishment. The concentration, temperature and pH value of the passivation solution in the passivation tank 2 are adjusted.

[0047] When adjusting the concentration, if the prepared passivation solution exceeds the highest liquid level inside the passivation tank 2, open the valve of the drain pipe 73 to drain the excess liquid from the passivation tank 2. When adjusting the temperature, if the temperature of the passivation solution inside the passivation tank 2 rises, open the valve of the return pipe 72 to allow the liquid in the passivation tank 2 to flow into the mixing tank 7. Under the action of the cooling curved pipe 74 and the lower stirring rod 75, the passivation solution is rapidly reduced to a suitable processing temperature. Then, the passivation solution in the mixing tank 7 is reintroduced into the passivation tank 2 through the feed pipe 8, thereby achieving dynamic adjustment of the passivation solution and maintaining the passivation film quality.

[0048] Example 2: Please refer to Figure 4 , Figure 7 and Figure 8 Based on Embodiment 1, a cleaning mechanism is also disclosed, the specific structure of which is as follows: The cleaning mechanism includes a side plate 19 fixedly installed on the edge of the upper surface of the lifting frame 16. A transverse groove 20 is opened on the side plate 19, and a movable block 21 is slidably installed in the groove 20. A decontamination component 18 is rotatably installed on the movable block 21 and is attached to the surface of the filter screen plate 17. A movable bracket 22 is fixedly installed on the movable block 21, and a transmission support rod 24 is rotatably connected to the movable bracket 22. A fixing block 23 is fixedly installed on the inner wall of the passivation groove 2, and the fixing block 23 is rotatably connected to the other end of the transmission support rod 24.

[0049] Please see Figures 7-13The cleaning assembly 18 includes three sets of cylindrical tubes 181 rotatably mounted on the movable block 21. Rollers 182 are arranged between the three sets of adjacent cylindrical tubes 181. A strip groove 163 is formed on the upper surface of the lifting frame 16 to provide rolling space for the rollers 182. An adhesive layer 183 is bonded to the outside of the cylindrical tubes 181. A sensing block 184 is slidably fitted on the cylindrical tubes 181. A fixing frame 185 is fixedly connected inside the cylindrical tubes 181. A telescopic rod 186 is slidably connected through the fixing frame 185. The telescopic rod 186 is fixedly connected to the sensing block 184, and a limit spring 187 is elastically connected between the sensing block 184 and the fixing frame 185. A pressure sensor 188 is fitted and fixed in the fixing frame 185. The position of the pressure sensor 188 corresponds to the position of the telescopic rod 186.

[0050] During the processing, the recycled passivation liquid may carry some solid impurities from the pipeline into the passivation tank 2, causing contamination of the passivation liquid. The passivation liquid in the passivation tank 2 can be filtered by the filter screen plate 17. The filtered liquid enters the spray pipe 4 through the discharge pipe 5 connected to the bottom of the passivation tank 2, ensuring that the recycled passivation liquid does not affect the processing quality. The operating cylinder 162 (the cylinder 162 can be fitted with a waterproof shell to ensure that it can be used in the passivation liquid) controls the lifting column 161 and the lifting frame 16 to move up and down reciprocally. The lifting frame 16 drives the filter screen plate 17 to move back and forth synchronously. This can enhance the liquid fluctuation in the passivation tank 2, making the liquid mix evenly, and also prevent solids from blocking the mesh of the filter screen plate 17, keeping the liquid flowing smoothly through the filter screen plate 17.

[0051] During the longitudinal reciprocating motion, the lifting frame 16 drives the sliding support rod 143 to move up and down synchronously. The sliding support rod 143 is slidably connected in the curved groove 142. During its movement, it can control the rotating column 141 to rotate back and forth. The rotating column 141 drives the upper stirring rod 14 and the lower stirring rod 75 to rotate synchronously, thereby achieving the mixing of the liquid inside the passivation tank 2 and the mixing tank 7.

[0052] Simultaneously, as the lifting frame 16 reciprocates up and down, the two ends of the transmission rod 24 connected between the movable bracket 22 and the fixed block 23 rotate accordingly. The rotating transmission rod 24 can push the movable bracket 22 to reciprocate laterally. The movable bracket 22 pushes the movable block 21 to reciprocate laterally in the transverse groove 20. The cleaning component 18 on the movable block 21 follows it and moves synchronously against the surface of the filter plate 17. The cylindrical tube 181 in the cleaning component 18 is pressed against the surface of the filter plate 17 and rolls. An adhesive layer 183 is adhesively installed on the outside of the cylindrical tube 181 (the adhesive layer 183 is adhesively installed on the outside of the cylindrical tube 181 by Velcro). During its rolling process, it can adhere the solid impurities isolated on the surface of the filter plate 17 to its surface, thereby achieving the self-cleaning effect on the surface of the filter plate 17. Moreover, the adhesive installation method makes it convenient to replace the adhesive layer 183 regularly to maintain its continuous cleaning effect on solid impurities.

[0053] When the cylindrical tube 181 is rolling to clean solid impurities on the surface of the filter screen plate 17, if there are too many solid impurities isolated on the filter screen plate 17, the solid impurities will accumulate to a certain thickness. During the rolling process, the sensing block 184 embedded on the side of the cylindrical tube 181 will be squeezed by the solid impurities. The sensing block 184 will move into the cylindrical tube 181, which will drive the telescopic rod 186 to move synchronously. When the telescopic rod 186 moves frequently and comes into contact with the pressure sensor 188, the isolation thickness of the solid impurities in the passivation tank 2 can be judged according to the frequency of pressure triggering, thereby reminding the staff to treat the passivation liquid in time and maintain the processing quality of the passivation liquid.

[0054] Example 3: Based on Example 2, a method for forming a corrosion-resistant compound film on galvanized pipes in a high-humidity environment is also disclosed. The film-forming method includes the following steps:

[0055] S1. Prepare passivation solution: Based on the performance requirements of the zinc coating on the surface of the galvanized pipe, prepare a liquid with appropriate concentration, temperature and pH in the mixing tank 7 and transfer it to the passivation tank 2. The passivation solution in the passivation tank 2 can be automatically added during the processing.

[0056] S2. Filter the liquid in passivation tank 2. During the passivation process, the liquid in passivation tank 2 is filtered and the isolated impurities are rolled and adhered to ensure the quality of the passivation liquid in passivation tank 2.

[0057] S3. Passivation film formation: The discharge pump 6 is run to control the liquid in the passivation tank 2 to enter the spray pipe 4. The pipe is set below the spray pipe 4. The spray pipe 4 sprays the passivation liquid to cover the outside of the pipe. The passivation time is controlled so that a zinc coating layer is formed on the outer wall of the pipe.

[0058] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0059] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for forming a corrosion-resistant compound film on a galvanized pipe in a high-humidity environment, comprising a processing support (1) and a passivation tank (2) mounted on the processing support (1), wherein a protective cover (3) is fixedly installed above the passivation tank (2), and a spray pipe (4) is installed in the protective cover (3), characterized in that: The protective cover (3) is fixed with a discharge pipe (5) that is connected to the spray pipe (4). The other end of the discharge pipe (5) is connected to the bottom of the passivation tank (2), and a discharge pump (6) is installed on the discharge pipe (5). The passivation tank (2) has a mixing tank (7) fixed in the center at the bottom. A feed pipe (8) is connected between the mixing tank (7) and the passivation tank (2). A feed pump (9) is installed on the feed pipe (8). The mixing tank (7) is equipped with a mixing mechanism to adjust the concentration, temperature and pH value of the liquid inside the passivation tank (2). A vertical slide bar (15) is fixedly installed on the inner wall of the passivation tank (2). A lifting frame (16) is engaged and slidably installed on the vertical slide bar (15). A filter screen plate (17) is embedded in the lifting frame (16). A cleaning mechanism for rolling and cleaning the isolated material on the filter screen plate (17) is provided on the lifting frame (16).

2. The apparatus for forming a corrosion-resistant compound film on a galvanized pipe in a high-humidity environment according to claim 1, characterized in that: The batching mechanism includes multiple batching pipes (71) that are connected to the batching tank (7), and a return pipe (72) is connected between the batching tank (7) and the passivation tank (2). A drain pipe (73) for discharging excess liquid from the passivation tank (2) is connected to the return pipe (72).

3. The apparatus for forming a corrosion-resistant compound film on a galvanized pipe in a high-humidity environment according to claim 2, characterized in that: The mixing tank (7) is equipped with a cooling curved pipe (74) to control the temperature of the mixing liquid, and a lower stirring rod (75) is rotatably connected inside the mixing tank (7) along the axial direction. The bottom surface of the passivation tank (2) is rotatably connected to an upper stirring rod (14), and the upper stirring rod (14) is fixedly connected to the lower stirring rod (75).

4. The apparatus for forming a corrosion-resistant compound film on a galvanized pipe in a high-humidity environment according to claim 3, characterized in that: A rotating column (141) is fixedly connected above the upper stirring rod (14) along the axial direction. Two sets of opposite curved grooves (142) are opened on the outer wall of the rotating column (141). A sliding support rod (143) is slidably connected in the curved groove (142). The sliding support rod (143) is fixedly installed on the surface of the lifting frame (16).

5. The apparatus for forming a corrosion-resistant compound film on a galvanized pipe in a high-humidity environment according to claim 1, characterized in that: A liquid level sensor (10), a temperature sensor (11), and an acid-base detector (12) are fixedly installed on the inner wall of the passivation tank (2). Two sets of inclined guide plates (13) are symmetrically fixed on both sides of the inner wall of the passivation tank (2) along the protective cover (3). A cylinder (162) is fixedly installed at the bottom of the guide plate (13), and a lifting column (161) is fixed at the output end of the cylinder (162). The lifting column (161) is fixedly installed on the lifting frame (16).

6. The apparatus for forming a corrosion-resistant compound film on a galvanized pipe in a high-humidity environment according to claim 1, characterized in that: The cleaning mechanism includes a side plate (19) fixedly installed on the edge of the upper surface of the lifting frame (16). A horizontal groove (20) is opened on the side plate (19). A moving block (21) is slidably installed in the horizontal groove (20). A decontamination component (18) is rotatably installed on the moving block (21). The decontamination component (18) is attached to the surface of the filter plate (17).

7. The apparatus for forming a corrosion-resistant compound film on a galvanized pipe in a high-humidity environment according to claim 6, characterized in that: A movable bracket (22) is fixedly installed on the movable block (21), and a transmission support rod (24) is rotatably connected to the movable bracket (22). A fixed block (23) is fixedly installed on the inner wall of the passivation groove (2), and the fixed block (23) is rotatably connected to the other end of the transmission support rod (24).

8. The apparatus for forming a corrosion-resistant compound film on a galvanized pipe in a high-humidity environment according to claim 6, characterized in that: The cleaning component (18) includes three sets of cylindrical tubes (181) rotatably mounted on the moving block (21), and rollers (182) are provided between the three sets of adjacent cylindrical tubes (181). A strip groove (163) is provided on the upper surface of the lifting frame (16) to provide the rollers (182) to roll. An adhesive layer (183) is bonded to the outside of the cylindrical tube (181).

9. The apparatus for forming a corrosion-resistant compound film on a galvanized pipe in a high-humidity environment according to claim 8, characterized in that: A sensing block (184) is slidably fitted onto the cylindrical tube (181). A fixing frame (185) is fixedly connected inside the cylindrical tube (181). A telescopic rod (186) is slidably connected through the fixing frame (185). The telescopic rod (186) is fixedly connected to the sensing block (184), and a limit spring (187) is elastically connected between the sensing block (184) and the fixing frame (185). A pressure sensor (188) is fitted and fixed in the mounting bracket (185), and the position of the pressure sensor (188) corresponds to the position of the telescopic rod (186).

10. A method for forming a corrosion-resistant compound film on a galvanized pipe in a high-humidity environment, used to perform the apparatus for forming a corrosion-resistant compound film on a galvanized pipe in a high-humidity environment as described in any one of claims 1 to 9, characterized in that, The film-forming method includes the following steps: S1. Prepare passivation solution. According to the performance requirements of the zinc coating on the surface of the galvanized pipe, prepare a liquid with appropriate concentration, temperature and acidity in the mixing tank (7) and transfer it to the passivation tank (2). The passivation solution in the passivation tank (2) can be automatically added during the processing. S2. Filter the liquid in the passivation tank (2). During the passivation process, filter the liquid in the passivation tank (2) and roll and stick the isolated impurities to ensure the quality of the passivation liquid in the passivation tank (2). S3. Passivation film formation: The discharge pump (6) controls the liquid in the passivation tank (2) to enter the spray pipe (4). The pipe is set below the spray pipe (4). The spray pipe (4) sprays the passivation liquid to cover the outside of the pipe. The passivation time is controlled so that a zinc plating layer is formed on the outer wall of the pipe.

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