A passivation tank and a passivation device for a steel coil

Abstract

A kind of steel coil is with passivation tank and passivation device, it is related to passivation tank technical field, including the tank body for containing passivation liquid, the stirring shaft of being driven along height direction and being driven by drive source is rotationally arranged in tank body bottom, it is characterized by: the liquid delivery channel is opened in the center of stirring shaft, a plurality of liquid injection holes are opened in the side wall of stirring shaft and communicated with liquid delivery channel, the liquid pumping pump is arranged on tank body, the inlet of liquid pumping pump is communicated with liquid inlet pipe, the end of liquid inlet pipe away from liquid pumping pump is communicated with the top of tank body, and the end portion is below the liquid level of passivation liquid;The outlet of liquid pumping pump is communicated with liquid delivery channel by liquid outlet pipe, the present application avoids the precipitation of passivation liquid, and improves the uniformity of passivation liquid.

Description

Technical Field

[0001] This utility model relates to the field of passivation pool technology, specifically a passivation pool and passivation device for steel coils. Background Technology

[0002] Galvanized steel coils are widely used in industries such as construction, home appliances, and automobiles due to their excellent corrosion resistance. In order to further improve their corrosion resistance and extend their service life, a passivation film is usually coated on the surface of the galvanized steel coil. The passivation solution can make the metal surface passive, forming an extremely thin protective film that effectively isolates the galvanized layer from the corrosive medium.

[0003] Currently, traditional passivation equipment typically includes a frame, passivation tank, feed roller, and coating roller. When the passivation solution is left to stand or circulation is poor, the active ingredients are prone to hydrolysis or precipitation due to the introduction of impurity ions. These precipitates can lead to a series of quality problems: First, the precipitates are carried to the steel strip surface by the feed roller and coating roller, causing appearance defects such as spots and streaks on the passivation film, severely affecting product quality; second, the precipitates accumulate on the roller surface, in pipes, and in pumps and valves, causing equipment blockage, affecting production continuity, and increasing maintenance costs. Utility Model Content

[0004] To address the problem of sedimentation in passivation solutions in existing technologies, this invention provides a passivation tank and passivation device for steel coils, which prevents sedimentation in the passivation solution and improves the uniformity of the passivation solution.

[0005] To achieve the above objectives, the specific solution adopted by this utility model is as follows: a passivation tank for steel coils includes a tank body for containing passivation liquid. A stirring shaft extending along the height direction and driven by a drive source is rotatably arranged at the bottom of the tank body. A liquid delivery channel is opened at the center of the stirring shaft. Multiple spray holes communicating with the liquid delivery channel are opened on the side wall of the stirring shaft. A liquid pump is arranged on the tank body. The inlet of the liquid pump is connected to an inlet pipe. One end of the inlet pipe away from the liquid pump is connected to the top of the tank body, and this end is located below the liquid surface of the passivation liquid. The outlet of the liquid pump is connected to the liquid delivery channel through an outlet pipe.

[0006] As an optimized solution for the passivation tank for steel coils mentioned above: one end of the pump is connected to the outlet of the pump, and the other end of the pump is connected to the delivery channel through a rotary joint.

[0007] As another optimized solution for the passivation tank for steel coils mentioned above: the stirring shaft is divided into a purging section, a turbulent section and a steady flow section from bottom to top. The diameter of the spray holes in the purging section is smaller than that in the turbulent section, the diameter of the spray holes in the turbulent section is smaller than that in the steady flow section, and the spray holes in the turbulent section are spirally distributed.

[0008] As another optimized solution for the passivation tank for steel coils mentioned above: the spray holes of the purging section are set at an angle, with their tops facing the liquid delivery channel and connected to the liquid delivery channel, and their bottoms facing the bottom of the tank.

[0009] As another optimized solution for the passivation tank for steel coils mentioned above: a partition plate is horizontally arranged in the tank body, dividing its inner cavity into a first receiving area for containing the passivation liquid and a second receiving area for containing the drive source and the pump.

[0010] As another optimized solution for the passivation tank for steel coils mentioned above: a sleeve fixedly connected to the tank body is fitted outside the stirring shaft, and an adjustment hole corresponding to the spray hole is opened on the side wall of the sleeve. The adjustment hole is located on the trajectory of the spray hole as it moves with the stirring.

[0011] As another optimized solution for the passivation tank for steel coils mentioned above: two opposing stirring blades are fixedly connected to the stirring shaft.

[0012] As another optimized solution for the passivation tank for steel coils mentioned above: the stirring blades are provided with an outlet chamber that communicates with the liquid delivery channel, and the stirring blades are provided with a first spray hole that sprays passivation liquid toward the side wall of the tank and a second spray hole that sprays passivation liquid toward the bottom of the tank, and both the first spray hole and the second spray hole are connected to the outlet chamber.

[0013] As another optimized solution for the passivation tank for steel coils mentioned above: a filter assembly is provided on one side of the inlet pipe. The filter assembly includes a filter screen inclinedly disposed inside the inlet pipe and a storage pipe inclinedly disposed on the side wall of the inlet pipe and connected to the inlet pipe. The bottom end of the filter screen extends into the storage pipe.

[0014] A passivation device for galvanized steel coils includes two passivation tanks arranged opposite each other. Above the passivation tanks are a take-up roller for adsorbing passivation liquid from the passivation tanks and a coating roller opposite to the take-up roller for coating the passivation liquid onto the surface of the steel strip. The passivation tanks are the passivation tanks described above.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. This utility model provides a passivation tank for steel coils. The passivation liquid is drawn from the top of the tank by a pump and sent into the delivery channel. Finally, it is sprayed out through the spray hole to form a circulating stirring system, which avoids sedimentation at the bottom of the passivation tank, ensures uniform distribution of the passivation liquid components, and thus improves product quality.

[0016] 2. In this invention, the stirring shaft is divided into a purging section, a turbulent flow section, and a steady flow section from bottom to top. The diameter of the spray holes gradually increases in each section, and the spray holes in the turbulent flow section are spirally distributed. The spray holes in the purging section are inclined towards the bottom of the pool, enabling efficient stirring in different areas. The purging section removes bottom sediment, the turbulent flow section generates strong turbulence to enhance mixing, and the steady flow section maintains stable overall flow, thereby comprehensively improving the mixing efficiency and stability of the passivation liquid. The steady flow section minimizes the impact of stirring on the liquid surface, avoiding large fluctuations in the liquid surface.

[0017] 3. A filter assembly is installed in the inlet pipe. The passivation liquid entering the inlet pipe passes through the filter screen, then through the pump and the delivery channel, and finally sprays out through the spray hole. The filter screen prevents the spray hole from being blocked; and the impurities at the filter are located in the impurity storage pipe.

[0018] 4. In this utility model, the stirring blades are provided with a liquid outlet chamber that communicates with the liquid delivery channel, as well as a first spray hole and a second spray hole facing the side wall and bottom of the pool, which realizes multi-directional spraying of passivation liquid, further enhances the stirring effect, avoids the formation of dead corners in the pool, and ensures that the passivation liquid is uniform throughout. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the passivation pool in Example 1.

[0020] Figure 2 This is a side view of the passivation pool.

[0021] Figure 3 This is a schematic diagram of the passivation pool in Example 3.

[0022] Figure 4 yes Figure 3 A magnified view of a portion of point A in the middle.

[0023] Figure 5 This is a schematic diagram of the passivation pool in Example 4.

[0024] Figure 6 yes Figure 5 A local method diagram at point B in the middle.

[0025] Figure 7 yes Figure 5 A magnified view of a section at point C.

[0026] Reference numerals: 1. Pool body; 101. First receiving area; 102. Second receiving area; 103. Divider plate; 2. Feeding roller; 3. Coating roller; 4. Drive source; 5. Spray hole; 6. Liquid delivery channel; 7. Liquid outlet pipe; 8. Liquid pump; 9. Liquid inlet pipe; 10. Impurity storage pipe; 11. Filter screen; 12. Stirring shaft; 1201. Purging section; 1202. Turbulent section; 1203. Flow stabilization section; 13. Sleeve; 14. Adjustment hole; 15. Stirring blade; 16. Second spray hole; 17. Liquid outlet chamber; 18. First spray hole. Detailed Implementation

[0027] The technical solution of this utility model will be further described in detail below with reference to specific embodiments. The parts of this utility model that are not described or disclosed in detail in the following embodiments should be understood as prior art known or should be known by those skilled in the art, such as the structure of the rotary joint, how the rotary joint is connected to the stirring shaft 12, how the rotary joint is connected to the liquid outlet pipe 7, etc.

[0028] Example 1 A passivation tank for steel coils includes a tank body 1 for containing a passivation solution. The tank body 1 is typically made of a corrosion-resistant material, and its size and shape are designed according to the production line and the specifications of the steel coils. A stirring shaft 12, extending along its height and driven by a drive source 4, is rotatably mounted at the bottom of the tank body 1. The stirring shaft 12 has a circular cross-section, and a liquid delivery channel 6 is formed at its center, extending along the length of the stirring shaft 12. The top of the stirring shaft 12 is closed. Multiple spray holes 5 communicating with the liquid delivery channel 6 are formed on the side wall of the stirring shaft 12. The number and distribution of the spray holes 5 can be designed according to the hydrodynamic principles of the passivation solution. The drive source 4 can be a drive motor or a cylinder. In this embodiment, the drive source 4 is a drive motor. A drive gear is coaxially fixedly connected to the drive shaft of the drive motor, and a driven gear meshing with the drive gear is coaxially fixedly connected to the outer side wall of the stirring shaft 12. The drive motor drives the stirring shaft 12 to rotate.

[0029] A liquid pump 8 is installed on the tank body 1. The inlet of the liquid pump 8 is connected to an inlet pipe 9. One end of the inlet pipe 9, away from the liquid pump 8, is connected to the top of the tank body 1. A connection hole is opened at the top of the tank body 1. The end of the inlet pipe 9 passes through the connection hole and extends into the tank body 1, and this end is located below the surface of the passivation liquid. The outer wall of the inlet pipe 9 is sealed to the connection hole to prevent the passivation liquid from leaking through the gap between the connection hole and the inlet pipe 9. The outlet of the liquid pump 8 is connected to the delivery channel 6 through an outlet pipe 7. One end of the outlet pipe 7 is connected to the outlet of the liquid pump 8, and the other end of the outlet pipe 7 is connected to the stirring shaft 12 through a rotary joint and is connected to the delivery channel 6. The rotary joint can ensure that the high-pressure liquid flows smoothly from the stationary outlet pipe 7 into the delivery channel 6 of the rotating stirring shaft 12, and can also ensure the sealing of the connection to prevent leakage. The rotary joint is existing technology and will not be described in detail here.

[0030] A horizontal partition plate 103 is installed inside the tank body 1, dividing its inner cavity into two independent receiving areas: a first receiving area 101 and a second receiving area 102. The passivation liquid is located in the first receiving area 101, while the pump 8 and drive source 4 are located in the second receiving area 102. The bottom end of the stirring shaft 12 is located in the second receiving area 102, and the top end of the stirring shaft 12 extends through the partition plate 103 into the first receiving area 101. The spray nozzle 5 is located on the portion of the stirring shaft 12 located in the first receiving area 101. The edge of the partition plate 103 is sealed to the inner wall of the tank body 1 to prevent the passivation liquid in the first receiving area 101 from leaking into the second receiving area 102. The partition plate 103 places the drive source 4 and the pump 8 in a relatively dry and clean space, facilitating their maintenance.

[0031] In this embodiment, a filter assembly is provided on one side of the inlet pipe 9. The filter assembly includes a filter screen 11 inclinedly disposed inside the inlet pipe 9 and a storage tube 10 inclinedly disposed on the side wall of the inlet pipe 9 and communicating with the inlet pipe 9. The bottom end of the filter screen 11 extends into the storage tube 10. When the passivation liquid is drawn into the inlet pipe 9, it first passes through the filter screen 11. The filter screen 11 intercepts larger particulate impurities, clumps, or flocculent matter in the liquid. Under the action of gravity and liquid scouring, the intercepted impurities slide down the inclined surface of the filter screen 11 and are eventually collected in the storage tube 10. A removable sealing plate is provided at the end of the storage tube 10 away from the inlet pipe 9. During normal operation, the sealing plate blocks the storage tube 10; when cleaning is required, the operator can open the sealing plate to clean the storage tube 10.

[0032] In this embodiment, the stirring shaft 12 rotates intermittently or continuously. If it rotates intermittently, the interval time is designed according to the actual working conditions.

[0033] When the stirring shaft 12 is working, the drive source 4 drives the stirring shaft 12 to rotate. At the same time, the liquid pump 8 draws out the passivation liquid from the top of the passivation tank and sends it into the liquid delivery channel 6. Finally, it is sprayed out through the spray hole 5. The sprayed passivation liquid impacts the passivation liquid in the tank 1 and forms a circulating stirring, so that the passivation liquid in the tank 1 is in a dynamic mixing state, which effectively avoids the precipitation at the bottom of the passivation tank. At the same time, since the spray holes 5 are distributed at different heights of the stirring shaft 12, and the number and distribution are designed according to the principles of fluid mechanics, it can ensure that the passivation liquid is fully stirred and mixed in all areas of the tank 1, thereby improving the uniformity of the passivation liquid.

[0034] The above are the basic embodiments of this utility model. Further improvements, optimizations, and limitations can be made based on the above to obtain the following embodiments: Example 2 This embodiment is an improvement on embodiment 1. Its main structure is the same as that of embodiment 1. The improvement is that the distribution of the spray holes 5 is defined. The stirring shaft 12 is divided into a purging section 1201, a turbulent section 1202 and a steady flow section 1203 from bottom to top. The diameter of the spray holes 5 in the purging section 1201 is smaller than that in the turbulent section 1202. The spray holes 5 in the purging section 1201 are divided into 3 groups along the length of the stirring shaft 12. Each group has 6 spray holes 5 distributed circumferentially along the stirring shaft 12. The spray holes 5 in this section have a smaller diameter, and the sprayed passivating liquid has a higher jet speed, forming a high-speed jet, which avoids the formation of sediment at the bottom of the tank 1. Even if some sediment is generated during intermittent operation, the high-speed jetting passivating liquid will wash the sediment up. The diameter of the spray holes 5 in the turbulent section 1202 is smaller than that in the steady-flow section 1203, and the spray holes 5 in the turbulent section 1202 are spirally distributed. When the passivating liquid is ejected from the spirally distributed spray holes, the jet direction is coupled with the rotation of the stirring shaft 12, forming strong turbulence and vortices in the middle of the tank 1, ensuring the uniformity of the passivating liquid. The steady-flow section 1203 is located at the top of the stirring shaft 12. The steady-flow section 1203 has four spray holes 5 distributed circumferentially along the stirring shaft 12. The passivating liquid ejected from this section has a lower flow velocity, suppressing violent fluctuations in the liquid surface.

[0035] Furthermore, the spray holes 5 of the purging section 1201 are set at an angle, with their top end facing the infusion channel 6 and connected to the infusion channel 6, and their bottom end facing the bottom of the pool body 1. This downward spray direction can directly impact and agitate the bottom area of ​​the pool where sediment is most easily deposited, thus playing the role of purging the bottom and effectively preventing sediment from accumulating and clumping.

[0036] Example 3 This embodiment is an improvement on Embodiment 1. Its main structure is the same as Embodiment 1, but the improvement lies in the following: multiple sets of spray holes 5 are spaced apart along the height of the stirring shaft 12. Within each set, the spray holes 5 are evenly spaced around the circumference of the stirring shaft 12. A sleeve 13, fixedly connected to the tank body 1, is fitted around the outside of the stirring shaft 12. The sleeve 13 rotates relative to the stirring shaft 12, and the inner diameter of the sleeve 13 is equal to the outer diameter of the stirring shaft 12. Adjustment holes 14, corresponding one-to-one with the spray holes 5, are provided on the side wall of the sleeve 13. The adjustment holes 14 are located on the trajectory of the spray holes 5 as they move with the stirring motion.

[0037] When the stirring shaft 12 rotates, the spray hole 5 also rotates. Since the sleeve 13 is fixed, the spray hole 5 periodically overlaps and misaligns with the regulating hole 14 during rotation. When they overlap, the passivation liquid flow rate from the spray hole is minimal. As the stirring shaft 12 continues to rotate, the spray hole gradually misaligns with the regulating hole 14, and the overlapping area between them gradually decreases, thus increasing the flow rate of the sprayed passivation liquid. This design creates a pulsed jet of passivation liquid. When a high-speed liquid pulse impacts the passivation liquid in the pool, it generates stronger disturbances and shock waves than a continuous jet, more effectively breaking up existing micro-particle agglomerates and applying intermittent, powerful impacts to the sediment at the bottom and walls of the pool, greatly enhancing the anti-sedimentation and homogenization effects. Furthermore, this dynamic change increases the stirring area. Meanwhile, when the overlapping area of ​​the spray hole and the regulating hole 14 is small, the flow rate of the sprayed passivation liquid is large, which can effectively wash away the tiny impurities attached to the inner wall of the spray hole 5 and play a self-cleaning role.

[0038] Example 4 This embodiment is an improvement on embodiment 1. Its main structure is the same as that of embodiment 1. The improvement is that two opposing stirring blades 15 are fixedly connected to the stirring shaft 12. One end of the stirring blade 15 is fixedly connected to the stirring shaft 12, and the other end of the stirring blade 15 extends toward the side away from the stirring shaft 12.

[0039] The stirring blade 15 has an outlet chamber 17 communicating with the infusion channel 6, and the stirring shaft 12 has a connecting hole for connecting the outlet chamber 17 and the infusion channel 6. The stirring blade 15 has a first spray hole 18 spraying passivating liquid towards the side wall of the tank 1 and a second spray hole 16 spraying passivating liquid towards the bottom of the tank 1, both of which are connected to the outlet chamber 17. The first spray hole 18 begins on the side of the stirring blade 15, and the second spray hole 16 is located on the lower surface of the stirring blade 15. The passivating liquid sprayed from the first spray hole 18 can flush the tank wall, preventing components in the passivating liquid from adhering to and forming scale on the tank wall, and re-rolling up any sediment that may form in the slow-flow area of ​​the tank wall boundary layer, carrying it into the main circulation. The second spray hole 16, together with the spray hole 5 at the bottom of the stirring shaft 12, provides supplementary and more thorough cleaning of the tank bottom.

[0040] Example 5 A passivation device for galvanized steel coils includes two passivation pools arranged opposite each other. Above the passivation pools are a feeding roller 2 for picking up passivation liquid from the passivation pools and a coating roller 3 that rolls opposite the feeding roller 2 to coat the passivation liquid onto the surface of the steel strip. The passivation pools are the passivation pools described in any one of the embodiments 1-4 above.

[0041] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A passivation tank for steel coils, comprising a tank body (1) for containing a passivation liquid, wherein a stirring shaft (12) extending in the height direction and driven by a drive source (4) is rotatably disposed at the bottom of the tank body (1), characterized in that: A liquid delivery channel (6) is provided in the center of the stirring shaft (12). Multiple spray holes (5) connected to the liquid delivery channel (6) are provided on the side wall of the stirring shaft (12). A liquid pump (8) is provided on the tank body (1). The inlet of the liquid pump (8) is connected to the inlet pipe (9). The end of the inlet pipe (9) away from the liquid pump (8) is connected to the top of the tank body (1), and the end of the inlet pipe (9) is located below the liquid surface of the passivation liquid. The outlet of the liquid pump (8) is connected to the liquid delivery channel (6) through the outlet pipe (7).

2. The passivation tank for steel coils as described in claim 1, characterized in that: One end of the pump (8) is connected to the outlet of the pump (8), and the other end of the pump (8) is connected to the infusion channel (6) through a rotary joint.

3. The passivation tank for steel coils as described in claim 1, characterized in that: The stirring shaft (12) is divided into a purging section (1201), a turbulent section (1202) and a steady flow section (1203) from bottom to top. The diameter of the spray hole (5) in the purging section (1201) is smaller than the diameter of the spray hole (5) in the turbulent section (1202). The diameter of the spray hole (5) in the turbulent section (1202) is smaller than the diameter of the spray hole (5) in the steady flow section (1203). The spray holes (5) in the turbulent section (1202) are spirally distributed.

4. The passivation tank for steel coils as described in claim 3, characterized in that: The spray hole (5) of the purging section (1201) is set at an angle, with its top end facing the infusion channel (6) and connected to the infusion channel (6), and its bottom end facing the bottom of the pool body (1).

5. The passivation tank for steel coils as described in claim 1, characterized in that: The pool body (1) is horizontally provided with a partition plate (103) to divide its inner cavity into a first containment area (101) for containing the passivation liquid and a second containment area (102) for containing the drive source (4) and the pump (8).

6. The passivation tank for steel coils as described in claim 1, characterized in that: The stirring shaft (12) is fitted with a sleeve (13) that is fixedly connected to the tank body (1). The sleeve (13) has an adjustment hole (14) on its side wall that corresponds to the spray hole (5). The adjustment hole (14) is located on the trajectory of the spray hole (5) as it moves with the stirring.

7. The passivation tank for steel coils as described in claim 1, characterized in that: Two opposing stirring blades (15) are fixedly connected to the stirring shaft (12).

8. The passivation tank for steel coils as described in claim 7, characterized in that: The stirring blade (15) is provided with an outlet cavity (17) that communicates with the infusion channel (6). The stirring blade (15) is provided with a first spray hole (18) that sprays passivation liquid toward the side wall of the pool body (1) and a second spray hole (16) that sprays passivation liquid toward the bottom of the pool body (1). Both the first spray hole (18) and the second spray hole (16) are connected to the outlet cavity (17).

9. The passivation tank for steel coils as described in claim 1, characterized in that: A filter assembly is provided on one side of the inlet pipe (9). The filter assembly includes a filter screen (11) inclinedly disposed in the inlet pipe (9) and a storage tube (10) inclinedly disposed on the side wall of the inlet pipe (9) and connected to the inlet pipe (9). The bottom end of the filter screen (11) extends into the storage tube (10).

10. A passivation apparatus for steel coils, comprising two passivation tanks arranged opposite each other, wherein a take-up roller (2) for adhering to the passivation liquid in the passivation tanks and a coating roller (3) opposite to the take-up roller (2) for coating the passivation liquid onto the surface of the steel strip are arranged above the passivation tanks, characterized in that: The passivation pool is the passivation pool described in any one of claims 1-9.

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