Long-distance maintenance-free mechanical defoaming device, lye circulating tank and degreasing system

Abstract

This invention relates to the field of defoaming technology, and provides a long-distance, maintenance-free mechanical defoaming device, including a housing, a defoaming impeller for eliminating foam, and a motor for driving the defoaming impeller to rotate. The defoaming impeller is disposed within the housing, and the housing has a suction section for foam to enter the housing. It also includes an impeller connecting shaft, on which the defoaming impeller is mounted. The impeller connecting shaft is coaxially connected to the motor shaft of the motor via a coaxial sealing assembly. A maintenance-free sealing assembly is also provided on the side of the coaxial sealing assembly near the suction section. An alkaline solution circulation tank, including the aforementioned long-distance, maintenance-free mechanical defoaming device, is also provided. A degreasing system, including the aforementioned long-distance, maintenance-free mechanical defoaming device, is also provided. This invention uses both a maintenance-free sealing assembly and a coaxial sealing assembly to simultaneously seal the motor, ensuring sealing performance.

Description

Technical Field

[0001] This invention relates to the field of defoaming technology, specifically to a long-distance, maintenance-free mechanical defoaming device, an alkali circulation tank, and a degreasing system. Background Technology

[0002] In industries such as steel, chemicals, pharmaceuticals, and food, the chemical media used in production often generate foam that is detrimental to production. If this foam is not treated promptly and effectively, it can harm production processes and equipment, damage equipment, affect product quality, and even reduce production capacity. For example, in the processing of steel strip, a degreasing section is required to clean the surface of rolled steel strips containing grease, scale powder, iron powder, carbon powder, and other contaminants. Because the degreasing agent contains surfactants, under the influence of agitation and temperature, it can trap air and generate a large amount of foam. This foam overflowing from the container can damage surrounding motors and cause environmental pollution. Foam overflowing into the steel strip cleaning tank can also affect the cleaning effect.

[0003] Currently, most industries use chemical defoamers to eliminate foam in the medium by changing the surface tension of the foam and reducing the thickness of the foam film. However, chemical defoamers are expensive, and their effectiveness is limited, inevitably requiring periodic addition during production, resulting in high production costs. Furthermore, chemical defoamers are difficult to degrade, and direct discharge easily pollutes the environment, with high treatment costs.

[0004] In the initial trials of mechanical defoaming devices in the industry, especially centrifugal defoaming devices which offer high efficiency, the centrifugal method, which uses a motor and impeller, suffers from several drawbacks. The impeller rotates at high speed, and if liquid enters the motor, it can burn out. Prolonged impeller operation or a long impeller shaft can cause impeller instability, ultimately rendering the centrifugal defoaming method ineffective or even destroying the equipment. The main components in contact with the medium are prone to wear due to the prolonged impact of the high-pressure, high-speed liquid flow and foam generated by the impeller, leading to frequent maintenance of these key components. Summary of the Invention

[0005] The purpose of this invention is to provide a long-distance, maintenance-free mechanical defoaming device, an alkali circulation tank, and a degreasing system, which can at least solve some of the defects in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a long-distance maintenance-free mechanical defoaming device, comprising a housing, a defoaming impeller for eliminating foam, and a motor for driving the defoaming impeller to rotate. The defoaming impeller is disposed within the housing, and the housing has a suction section for foam to enter the housing. It also includes an impeller connecting shaft, on which the defoaming impeller is disposed. The impeller connecting shaft is coaxially connected to the motor shaft of the motor via a coaxial sealing assembly. A maintenance-free sealing assembly is also provided on the side of the coaxial sealing assembly near the suction section.

[0007] Furthermore, the coaxial sealing assembly includes a coupling, through which the impeller connecting shaft and the motor shaft are coaxially connected.

[0008] Furthermore, the coaxial sealing assembly also includes bearings for supporting the motor shaft and the impeller connecting shaft.

[0009] Furthermore, the coaxial sealing assembly also includes a bearing cap for fixing the axial position of the bearing, the bearing cap being located between the coupling and the bearing.

[0010] Furthermore, a bearing sealing housing is provided outside the impeller connecting shaft.

[0011] Furthermore, the maintenance-free sealing assembly includes a dynamic and a static ring, and a gravity block that can drive the dynamic and static rings to adhere to the motor shaft when stationary.

[0012] Furthermore, it also includes an auxiliary impeller that can generate pressure in the opposite direction to the defoaming impeller, the auxiliary impeller being mounted on the motor shaft.

[0013] Furthermore, a sliding bearing is provided at the end of the impeller connecting shaft away from the motor.

[0014] This invention provides another technical solution: an alkaline solution circulation tank, including the above-mentioned remote maintenance-free mechanical defoaming device.

[0015] This invention provides another technical solution: a degreasing system, including the above-mentioned long-distance maintenance-free mechanical defoaming device.

[0016] Compared with the prior art, the beneficial effects of the present invention are: by using maintenance-free sealing components and coaxial sealing components in combination to achieve sealing of the motor, sealing performance can be ensured. Attached Figure Description

[0017] Figure 1 A front-view cross-sectional schematic diagram of a defoaming device (with a self-rinsing structure) provided in an embodiment of the present invention;

[0018] Figure 2A cross-sectional view of a defoaming device provided in an embodiment of the present invention (with an elongated motor shaft and a self-rinsing structure);

[0019] Figure 3 A cross-sectional view of a defoaming device provided in an embodiment of the present invention (with maintenance-free sealing function);

[0020] Figure 4 A cross-sectional view of a defoaming device provided in an embodiment of the present invention (with long-distance defoaming function);

[0021] Figure 5 A cross-sectional view of a defoaming device provided in an embodiment of the present invention (with maintenance-free sealing function and long-distance defoaming function);

[0022] Figure 6 A schematic diagram from a top view of an embodiment of the present invention for an antifoaming device;

[0023] Figure 7 A schematic diagram of an online alkali concentration detection system for an alkali circulation tank provided in an embodiment of the present invention;

[0024] Figure 8 This is a side view of the electromagnetic filter provided in an embodiment of the present invention;

[0025] Figure 9 This is a top view of the electromagnetic filter provided in an embodiment of the present invention;

[0026] Figure 10 This is a schematic diagram of the front view structure of an electromagnetic filter provided in an embodiment of the present invention;

[0027] Figure 11 This is a schematic diagram of the iron sludge treatment subsystem provided in an embodiment of the present invention;

[0028] Figure 12 for Figure 11 Top view;

[0029] Figure 13 This is a schematic diagram of the iron sludge collection box provided in an embodiment of the present invention. Detailed Implementation

[0030] 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.

[0031] Example 1:

[0032] Please see Figure 1 , Figure 2 and Figure 6 This invention provides a self-rinsing structure, including a guide member 200 extending to the part to be rinsed and a driving member for driving rinsing fluid along the guide member 200 to the part to be rinsed. The guide member 200 is hood-shaped, and the hood body of the hood-shaped guide member 200 serves as the guiding surface. The driving member is disposed within the area covered by the hood body. In this embodiment, the hood-shaped guide member 200 allows the part to be rinsed to be placed at the center of the guide member 200. The rinsing fluid driven by the driving member can then flow along the hood body towards the part to be rinsed, thereby achieving the effect of rinsing the part to be rinsed. Moreover, due to the hood-shaped design, a wider guiding surface can be provided, resulting in a better rinsing effect. The purpose of rinsing can be to remove dirt or to cool. Distributing the driving member within the area covered by the hood body makes the structure more compact and facilitates the design of more different driving forms.

[0033] Please see Figure 1 , Figure 2 and Figure 6 The driving component includes a secondary impeller 14 capable of generating suction, which is mounted directly below the shroud. In this embodiment, when the secondary impeller 14 rotates, it generates a certain suction force within the shroud, drawing the rinsing fluid onto the shroud. When the rotation speed is high, the drawn-up rinsing fluid flows along the direction of the shroud's extension, and then flows onto the part to be rinsed. Of course, this is one method of driving; alternatively, a pump or other structure with suction force can be used to draw the rinsing fluid and guide it onto the part to be rinsed, which is also feasible, and this embodiment does not limit this approach.

[0034] Please see Figure 1 , Figure 2 and Figure 6 The cover includes an arc-shaped plate that forms a guide surface with a smooth curve. In this embodiment, the arc-shaped guide surface facilitates the rinsing fluid to "climb" onto the part to be rinsed.

[0035] For further optimization of the above solution, please refer to [link / reference]. Figure 1 , Figure 2 and Figure 6 The arc-shaped plate bends in a direction away from the driving component. In this embodiment, the arc-shaped plate is flared outwards, like a lid covering the surface, which facilitates the rising and guiding of the flushing fluid. Of course, bending in the opposite direction is also feasible, and this embodiment does not limit this.

[0036] As an optimized solution for an embodiment of the present invention, please refer to Figure 1 , Figure 2 and Figure 6 The curved plate consists of multiple pieces, with adjacent curved plates joined together. In this embodiment, the cover can be assembled from multiple plates, for example, by welding or other joining methods, which facilitates transportation and assembly. A sealed state is preferred during assembly. Of course, using a single piece of plate for integral molding would be even better. Joining methods can include welding, bonding, etc.

[0037] As an optimized solution for an embodiment of the present invention, please refer to Figure 1 , Figure 2 and Figure 6 The cover includes an inclined flat plate, the inclined surface of which serves as the guide surface. In this embodiment, in addition to using an arc-shaped plate, using an inclined flat plate is also feasible, which also facilitates the rinsing fluid to "climb" up the plate onto the part to be rinsed.

[0038] As an optimized solution for an embodiment of the present invention, please refer to Figure 1 , Figure 2 and Figure 6 The plate consists of multiple pieces, with adjacent plates joined together. In this embodiment, the plate can also be made of multiple pieces joined together, or it can be formed as a single piece.

[0039] As an optimized solution for an embodiment of the present invention, please refer to Figure 1 , Figure 2 and Figure 6 It also includes a liquid storage tank 201, with the other end of the cover extending into the liquid storage tank 201. In this embodiment, when the defoaming impeller 13 attracts foam into the housing 5 and performs defoaming, some of the liquid medium that impacts the inner wall of the housing 5 will enter the liquid storage tank 201, thereby facilitating the supply of liquid medium to the guide member 200.

[0040] As an optimized solution for an embodiment of the present invention, please refer to Figure 1 , Figure 2 and Figure 6 The secondary impeller 14 has a flow channel through which the liquid medium passes. In this embodiment, the secondary impeller 14 is also designed with a flow channel through which the liquid medium passes, facilitating the upward movement of the liquid medium.

[0041] Example 2:

[0042] Please see Figure 1 , Figure 2 and Figure 6This invention provides a defoaming device, including a housing 5 and a defoaming impeller 13 for eliminating foam. The defoaming impeller 13 is disposed within the housing 5. The housing 5 has a suction section 17 for foam to enter the housing 5, and also includes the aforementioned self-cleaning structure 20 disposed within the housing 5. In this embodiment, by placing the self-cleaning structure 20 within the housing 5, the defoaming device has the ability to self-clean and drive the defoaming impeller 13 to rotate, eliminating the need for external piping for rinsing, reducing installation difficulty, and saving energy. Preferably, the housing 5 can be cylindrical or rectangular. Preferably, the defoaming impeller 13 can be one or more combined impellers, which can be axial flow impellers or fan-shaped impellers. Furthermore, the impeller can be a plate-welded impeller or a cast impeller. The suction section 17 has a flared opening welded below the suction pipe, increasing the suction area and improving suction efficiency.

[0043] As an optimized solution for an embodiment of the present invention, please refer to Figure 1 , Figure 2 and Figure 6 The system also includes a motor 10 mounted on the housing 5, with the motor shaft 100 extending into the housing 5. All defoaming impellers 13 are mounted on the motor shaft 100. In this embodiment, when the driving component is a secondary impeller 14, the secondary impeller 14 is also mounted on the motor shaft 100. The component driving the defoaming impeller 13 to rotate can be the motor 10; both the secondary impeller 14 and the defoaming impeller 13 can be driven to rotate by the motor 10. After the defoaming impeller 13 removes foam, the secondary impeller 14 also draws the liquid medium upwards to the guide member 200. The liquid medium on the guide member 200 flows onto the item to be rinsed and then flows down again, mixing with the defoamed liquid medium below and being drawn upwards again, thus achieving self-circulating rinsing of the item to be rinsed. Preferably, the motor 10 can be one of a power frequency motor 10, a variable frequency motor 10, an explosion-proof motor, or a non-explosion-proof motor, and can be either high-efficiency or ordinary type. The entire motor shaft 100 is clamped and machined in one operation. This successfully solves the problem of reliable connection between the motor 10 and the defoaming impeller 13, ensuring good concentricity and reliable and stable operation of the device.

[0044] As an optimized solution for an embodiment of the present invention, please refer to Figure 1 , Figure 2 and Figure 6 It also includes a sealing structure 18 for sealing the motor shaft 100. In this embodiment, the sealing structure 18 is used to seal the motor 10 in order to prevent liquid from entering the motor 10 and causing damage to the motor 10.

[0045] For further optimization of the above technical solution, please refer to [link / reference]. Figure 1 , Figure 2 and Figure 6 The sealing structure 18 is a mechanical seal structure 18, and the flow guide 200 extends to the mechanical seal structure 18. In this embodiment, the sealing method can be a mechanical seal structure 18, which is the most effective and stable sealing method. However, mechanical seals require flushing and cooling. In this embodiment, the defoaming medium can flow along the flow guide 200 to the mechanical seal structure 18 for cooling. The aforementioned component to be flushed can be the mechanical seal structure 18, thus eliminating the need for fresh water for cooling and significantly reducing production costs. In addition, the flow guide 200, covering the medium, can also work with the sealing structure 18 to provide a certain sealing effect. This is because while achieving self-circulating flushing, it also guides the liquid to flow downwards, completely isolating the foam flow and liquid flow in the container from the motor 10. The foam flow or liquid flow caused by the positive or negative pressure formed by the easily foaming medium in the container will not damage the motor 10. Preferably, the mechanical seal can include either a non-container mechanical seal or a container mechanical seal. Its function is to effectively seal and isolate the foam flow and medium flow from entering the motor 10 or the external environment along the shaft.

[0046] For further optimization of the above technical solution, please refer to [link / reference]. Figure 1 , Figure 2 and Figure 6 The mechanical seal structure 18 is externally provided with a sealing housing 19, and the flow guide 200 passes through the sealing housing 19 to the mechanical seal structure 18. Using a sealing housing 19 externally to the mechanical seal structure 18 can improve the sealing effect.

[0047] As an optimized solution for an embodiment of the present invention, please refer to Figure 1 , Figure 2 and Figure 6 The bottom of the housing 5 is provided with a flow guide box 16. In this embodiment, the motor 10 drives the defoaming impeller 13 to rotate through the motor shaft 100, the sealing structure 18, and the auxiliary impeller 14. After the defoaming impeller 13 rotates, it generates a suction force, which draws the foam generated on the surface of the container into the inlet of the defoaming impeller 13 through the suction section 17, which is set along the shape of the container. The defoaming impeller 13 uses the shear force and compression effect generated by the impeller to break the bubbles, resulting in gas-liquid separation. The liquid is thrown towards the housing 5 by inertial force. The liquid generated after defoaming flows into the flow guide box 16 along the housing 5. The flow guide box 16 further dissipates the energy of the defoamed fluid and disperses it into the container to avoid conflict with the foam flow. Preferably, the flow guide box 16 is a multi-piece threaded structure welded on a plate. A ring of columns is welded to the upper surface of the suction section 17, and the columns are connected to the housing 5 by threads.

[0048] As an optimized solution for an embodiment of the present invention, please refer to Figure 1 , Figure 2 and Figure 6The aforementioned liquid storage tank 201 is located on the housing 5. When the defoaming impeller 13 attracts foam into the housing 5 and performs defoaming, some of the liquid medium that impacts the inner wall of the housing 5 will enter the liquid storage tank 201. This part of the liquid medium will flow along the guide 200 to the sealing structure 18 to rinse and cool the sealing structure 18.

[0049] As an optimized solution for an embodiment of the present invention, please refer to Figure 1 , Figure 2 and Figure 6 It also includes a mouth ring 15 disposed at the suction section 17. In this embodiment, a mouth ring 15 is added between the suction port and the inner cavity of the defoaming impeller 13, which increases the sealing of the suction port of the defoaming impeller 13, reduces wear, improves the suction of the defoaming impeller 13, prevents internal circulation, and increases the efficiency of the defoaming impeller 13.

[0050] As an optimized solution for an embodiment of the present invention, please refer to Figure 1 , Figure 2 and Figure 6 The motor 10 is mounted on the mounting base 11, which is located above the housing 5. The mounting base 11 is installed on top of the container according to a size that matches the container, and the motor 10 is directly connected to the mounting base 11, reducing the weight and size of the device. Preferably, the mounting base 11 can be one of a circular flange, a square flange, or a steel frame.

[0051] As an optimized solution for an embodiment of the present invention, please refer to Figure 1 , Figure 2 and Figure 6 A sliding bearing 6 is provided at the end of the motor shaft 100 away from the motor 10. In this embodiment, when the foam to be sucked is in a deeper position, and it is necessary to lengthen the motor shaft 100 or the impeller connecting shaft 12, a sliding bearing 6 can be provided at the shaft end to ensure stable and reliable operation of the shaft and the parts on the shaft. Preferably, the sliding bearing 6 includes a housing, a wear-resistant bushing, and a bushing. The sliding friction between the bushing and the bushing achieves the functions of shock absorption and support, balancing the radial force generated during operation or unstable rotation of the long shaft. This part is fixed by welding a bracket inside the suction section 17.

[0052] Example 3:

[0053] Please see Figure 3 and Figure 6This invention provides a maintenance-free defoaming device, which is a modification of the aforementioned defoaming device. The self-rinsing structure 20 is removed, and a maintenance-free sealing component 30 is added. Specifically, the device includes a housing 5, a defoaming impeller 13 for eliminating foam, and a motor 10 for driving the defoaming impeller 13 to rotate. The defoaming impeller 13 is disposed within the housing 5 and coaxially connected to the motor shaft 100 of the motor 10. The housing 5 has a suction section 17 for foam to enter the housing 5, and also includes a maintenance-free sealing component 30 for sealing the motor shaft 100. The maintenance-free sealing component 30 is disposed on the side of the defoaming impeller 13 away from the suction section 17. In this embodiment, the maintenance-free sealing component 30 prevents liquid media from entering the motor 10 and burning out the motor 10.

[0054] As an optimized solution for an embodiment of the present invention, please refer to Figure 3 and Figure 6 The maintenance-free sealing assembly 30 includes a moving and stationary ring and a gravity block that can drive the moving and stationary rings to adhere to the motor shaft 100 when stationary. In this embodiment, when the device stops operating, the gravity block can cause the moving and stationary rings to adhere to the motor shaft 100 to achieve a stop seal.

[0055] For further optimization of the above solution, please refer to [link / reference]. Figure 3 and Figure 6 It also includes an auxiliary impeller 14 that generates pressure in the opposite direction to that of the defoaming impeller 13, and the auxiliary impeller 14 is mounted on the motor shaft 100. In this embodiment, when the device is working, the gravity block rotates, driving the moving and stationary rings to separate from the motor shaft 100. At this time, the auxiliary impeller 14 works. Since its pressure direction is opposite to that generated by the defoaming impeller 13, it prevents high-pressure medium from leaking into the sealing cavity where the maintenance-free sealing device is located during device operation. The auxiliary impeller 14 used in conjunction with it also plays a role in balancing axial forces.

[0056] For other structures of the defoaming device, please refer to the above embodiments, which will not be repeated here.

[0057] Example 4:

[0058] Please see Figure 4 and Figure 6This invention provides a long-distance defoaming device, including a housing 5, a defoaming impeller 13 for eliminating foam, and a motor 10 for driving the defoaming impeller 13 to rotate. The defoaming impeller 13 is disposed within the housing 5, and the housing 5 has a suction section 17 for foam to enter the housing 5. It also includes an impeller connecting shaft 12, on which the defoaming impeller 13 is mounted. The impeller connecting shaft 12 is coaxially connected to the motor shaft 100 of the motor 10 via a coaxial sealing assembly 40. In this embodiment, when the defoaming distance is relatively long, an additional impeller connecting shaft 12 can be added for mounting the defoaming impeller 13, thereby achieving a better defoaming effect. In this case, the impeller connecting shaft 12 needs to be coaxially connected to the motor shaft 100. The coaxial sealing assembly 40 can play a sealing role, preventing liquid media from entering the motor 10 and burning out the motor 10.

[0059] As an optimized solution for an embodiment of the present invention, please refer to Figure 4 and Figure 6 The coaxial sealing assembly 40 includes a coupling 400, through which the impeller connecting shaft 12 and the motor shaft 100 are coaxially connected. In this embodiment, the coupling 400 connects the motor shaft 100 and the impeller connecting shaft 12, transmitting the power and torque of the motor 10 to the shaft and its components. This component also serves as a safety device, preventing liquid-containing media from flowing along the shaft into the motor 10 and causing it to burn out.

[0060] For further optimization of the above solution, please refer to [link / reference]. Figure 4 and Figure 6 The coaxial sealing assembly 40 further includes a bearing 401 for supporting the motor shaft 100 and the impeller connecting shaft 12. In this embodiment, the bearing 401 can be an angular contact ball bearing 401 or a deep groove ball bearing 401, which can simultaneously balance axial and radial forces. This part supports the shaft, reduces friction and wear, and lowers noise.

[0061] For further optimization of the above solution, please refer to [link / reference]. Figure 4 and Figure 6 The coaxial sealing assembly 40 further includes a bearing cap 402 for fixing the axial position of the bearing 401, the bearing cap 402 being located between the coupling 400 and the bearing 401. In this embodiment, the cap is equipped with an oil cup or oil filling line and valve for easy replenishment of lubricating oil, and its inner bore is fitted with one or a combination of packing seal, skeleton oil seal, labyrinth seal, and dry gas seal to prevent oil leakage.

[0062] As an optimized solution for an embodiment of the present invention, please refer to Figure 4 and Figure 6The impeller connecting shaft 12 is provided with a bearing sealing housing 403. In this embodiment, the bearing sealing housing 403 cooperates with the bearing cover 402 to isolate the bearing 401 from the external environment to form a sealed space, while supporting the bearing 401 so that it can operate stably and reliably. The bearing sealing housing 403 can be in contact with the medium inside the container and can be effectively isolated, while the bearing sealing housing 403 can also be outside the container.

[0063] As an optimized solution for an embodiment of the present invention, please refer to Figure 4 and Figure 6 It also includes a sealing structure 18 for sealing, which is disposed on the side of the coaxial sealing assembly 40 near the suction section 17. In this embodiment, in addition to using the coaxial sealing assembly 40 described above, the sealing structure 18 can also be used for sealing. Specifically, the sealing sequence is that the sealing structure 18 seals first. If the coaxial sealing assembly 40 fails to block the liquid medium, the sealing structure 18 can also block the liquid medium outside the motor 10.

[0064] For further optimization of the above solution, please refer to [link / reference]. Figure 4 and Figure 6 The sealing structure 18 can be the sealing structure 18 in the above embodiment 2, and its specific structure will not be described in detail here.

[0065] For other structures of the defoaming device, please refer to the above embodiments, which will not be repeated here.

[0066] Example 5:

[0067] Please see Figure 5 and Figure 6This invention provides a long-distance maintenance-free mechanical defoaming device, which is composed of the maintenance-free seal described in Embodiment 3 and the long-distance defoaming device described in Embodiment 5. The resulting defoaming device combines the functions of maintenance-free sealing and long-distance defoaming. Specifically, the device includes a housing 5, a defoaming impeller 13 for eliminating foam, and a motor 10 for driving the defoaming impeller 13 to rotate. The defoaming impeller 13 is disposed inside the housing 5. The housing 5 has a suction section 17 for foam to enter the housing 5, and also includes an impeller connecting shaft 12. The defoaming impeller 13 is disposed on the impeller connecting shaft 12. The impeller connecting shaft 12 is coaxially connected to the motor shaft 100 of the motor 10 through a coaxial sealing assembly 40. A maintenance-free sealing assembly 30 is also provided on the side of the coaxial sealing assembly 40 near the suction section 17. In this embodiment, when the defoaming distance is relatively long, an additional impeller connecting shaft 12 can be added for the installation of the defoaming impeller 13, thereby achieving a better defoaming effect. At this point, the impeller connecting shaft 12 needs to be coaxially connected with the motor shaft 100. This coaxial sealing assembly 40 can play a sealing role, preventing liquid medium from entering the motor 10 and burning out the motor 10. At the same time, a maintenance-free sealing assembly 30 is also used, which can achieve a double sealing effect, thereby greatly improving the sealing performance and making this device maintenance-free.

[0068] As an optimized solution for an embodiment of the present invention, please refer to Figure 5 and Figure 6 The coaxial sealing assembly 40 and the maintenance-free sealing assembly 30 can be found in Embodiments 3 and 4, and will not be described again here.

[0069] Example 6:

[0070] Please see Figures 1 to 6 This invention provides a defoaming device, which is a modification of Embodiment 2. Removing the self-flushing structure 20 also achieves a good sealing effect. Specifically, the defoaming device includes a housing 5, a defoaming impeller 13 for eliminating foam, and a motor 10 for driving the defoaming impeller 13 to rotate. The defoaming impeller 13 is disposed within the housing 5, which has a suction section 17 for foam to enter. It also includes an auxiliary impeller 14 that generates pressure in the opposite direction to that of the defoaming impeller 13. The auxiliary impeller 14 is mounted on the motor shaft 100 and is located on the side of the defoaming impeller 13 closest to the motor 10. In this embodiment, because the pressure direction of the auxiliary impeller 14 is opposite to that generated by the defoaming impeller 13 during operation, it can prevent high-pressure medium from leaking into the motor 10 and burning out the motor 10. Additionally, the auxiliary impeller 14 can also balance axial forces.

[0071] For other structures of the defoaming device, please refer to Embodiment 2 above, which will not be repeated here.

[0072] Example 7:

[0073] Please see Figure 7 This invention provides an alkaline solution circulation tank, which uses the defoaming device described in the above embodiments to defoam the reaction medium in the alkaline solution circulation tank.

[0074] As an optimized solution for an embodiment of the present invention, please refer to Figure 7 This alkali circulation tank also includes an online alkali concentration detection system and a corresponding online alkali concentration detection method. Specifically:

[0075] like Figure 7 As shown, an online method for detecting the concentration of alkali solution includes the following steps:

[0076] S1. Obtain the concentration of the alkali solution and the corresponding surface tension of the alkali solution. With the concentration of the alkali solution as the dependent variable y and the corresponding surface tension of the alkali solution as the independent variable x, establish an alkali solution concentration prediction model y = a0 + a1x + a2x. 2 +…+a n x n Among them, a0, a1 to a n These are model parameters;

[0077] S2, Train the alkaline solution concentration prediction model until the predicted alkaline solution concentration deviation is controlled within the allowable range;

[0078] S3, obtain the real-time surface tension of the alkaline solution as the independent variable x. s Substituting the values ​​into the trained alkaline solution concentration prediction model yields the corresponding real-time alkaline solution concentration prediction value y. s ;

[0079] S4, based on the real-time alkaline concentration prediction value y s Adjust the real-time alkali concentration to the set alkali concentration value.

[0080] In some embodiments, the supply side may specifically be a compressed air station.

[0081] Unlike related technologies that use offline sampling and testing for alkali concentration detection, the technical solution disclosed in this disclosure achieves online alkali concentration detection. Based on online detection, it enables automatic control of alkali concentration, ensuring stability, guaranteeing strip cleaning quality, and minimizing hysteresis. The surface tension of the alkali solution represents its cleaning capacity, providing good representativeness. A soft-sensor method is used to establish the relationship between alkali concentration and surface tension. The alkali concentration prediction model can continuously learn through training, achieving very high accuracy. Furthermore, based on the alkali concentration, it allows for the replenishment of raw alkali, demineralized water, or the discharge of waste alkali, with minimal fluctuations in alkali concentration.

[0082] It should be noted that the technical solution disclosed herein does not limit the order of steps S1, S2, S3, and S4. That is, step S1 can be executed before, after, or simultaneously with steps S2, S3, and S4. The order of the steps is also not limited.

[0083] In a specific implementation scenario:

[0084] First, surface tension data of alkaline solutions at different concentrations were collected and stored in an online alkaline concentration detection and automatic control computer. The alkaline concentration data was collected through offline sampling and analysis. Using alkaline concentration as the dependent variable y and surface tension as the independent variable x, an alkaline concentration prediction model was established: y = a0 + a1x + a2x 2 +…+a n x n After accumulating a certain amount of sample data on alkali concentration and surface tension, regression training is performed using the least squares method based on the alkali concentration and surface tension sample data until the deviation in predicting alkali concentration is controlled within the allowable range.

[0085] Secondly, real-time data on the surface tension of the alkali solution is collected using an online alkali surface tension detector, and the real-time alkali concentration is calculated by calling a trained alkali concentration prediction model.

[0086] Finally, the automatic alkali concentration control module is activated. This module compares the setpoint alkali concentration data with the real-time alkali concentration data, using the electrolyte circulation tank level and the alkali circulation tank level as constraints. If the real-time alkali concentration is too high, demineralized water is added; if it is too low, the original alkali is added. If the real-time alkali concentration falls below a certain threshold, waste alkali is discharged, thus achieving automatic alkali concentration control. This ensures stable alkali concentration and guarantees the quality of strip steel cleaning.

[0087] This disclosure also provides an online alkaline solution concentration detection system, which can be used to implement any of the above-described online alkaline solution concentration detection methods. The online alkaline solution concentration detection system includes:

[0088] The modeling module is configured to obtain the concentration of alkali solution and the corresponding surface tension of the alkali solution, with the alkali solution concentration as the dependent variable y and the corresponding surface tension of the alkali solution as the independent variable x, to establish an alkali solution concentration prediction model y = a0 + a1x + a2x 2 +…+a n x n Among them, a0, a1 to a n These are model parameters;

[0089] The training module is configured to use the least squares method to perform regression training on the alkaline concentration prediction model until the deviation in the predicted alkaline concentration is controlled within the allowable range.

[0090] The detection module is configured to acquire the real-time surface tension of the alkaline solution as the independent variable xs, and substitute it into the trained alkaline solution concentration prediction model to obtain the corresponding real-time alkaline solution concentration prediction value ys.

[0091] The automatic alkali concentration control module is configured to adjust the real-time alkali concentration to the set alkali concentration value based on the real-time predicted alkali concentration value ys.

[0092] like Figure 7 As shown, the automatic control module for alkali concentration includes an online alkali concentration detection and automatic control computer, an industrial Ethernet network, a PLC for the alkali washing process section, and shut-off valves 1, 2, 3, 4, 5, and 6. The detection module includes level gauges 1 and 2, and online alkali surface tension meters 1 and 2. The online alkali concentration detection and automatic control computer communicates with the PLC for the alkali washing process section via an industrial Ethernet network.

[0093] The system includes an online alkali concentration detection and automatic control computer that communicates with the PLC of the alkali washing process section to collect data and issue commands. The PLC is connected to level gauges 1 and 2, online alkali surface tension detectors 1 and 2, and shut-off valves 1, 2, 3, 4, 5, and 6 to collect real-time information such as the alkali level in the electrolyte circulation tank, the alkali surface tension in the electrolyte circulation tank, and the alkali surface tension in the alkali circulation tank. The automatic alkali concentration control module compares the setpoint data with the real-time alkali concentration data, using the electrolyte circulation tank level and the alkali circulation tank level as constraints. If the real-time alkali concentration is too high, demineralized water is added; if it is too low, the original alkali is added. If the real-time alkali concentration falls below a certain threshold, waste alkali is discharged, thus achieving automatic alkali concentration control. This ensures stable alkali concentration and guarantees the quality of strip steel cleaning.

[0094] Example 8:

[0095] like Figures 8-10 This embodiment provides an electromagnetic filter 100, which can be used in the above embodiment 1 as the magnetic filter 15 therein.

[0096] The electromagnetic filter 100 includes a filter tank 101, a filter disc 102, and an impurity collector 103. The filter disc 102 includes an annular support 1021, a plurality of electromagnetic chucks 1022, and an electronic control unit for controlling the gain and loss of power of each electromagnetic chuck 1022. Each electromagnetic chuck 1022 is mounted on the annular support 1021 and is arranged in a ring along the circumference of the annular support 1021. The annular support 1021 is provided with a rotary drive mechanism 105 for driving its rotation. The annular support 1021 is partially located in the filter tank 101. The impurity collector 103 is arranged outside the filter tank 101 and includes an impurity removal section for driving impurities away from the electromagnetic chucks 1022.

[0097] In one embodiment, the aforementioned annular support 1021 includes an inner ring frame and an outer ring frame, which are connected by a plurality of spokes. Each spoke divides the annular area between the inner ring frame and the outer ring frame into a plurality of suction cup mounting positions, and each suction cup mounting position is equipped with an electromagnetic chuck 1022.

[0098] Optionally, such as Figure 11 The spokes are radially distributed along the annular support 1021, and the inner ring frame, spokes, and outer ring frame are connected to form a hub shape.

[0099] The electromagnetic chuck 1022 is preferably detachably mounted on the annular bracket 1021, including but not limited to fixing with screws.

[0100] The surface of the electromagnetic chuck 1022 is preferably coplanar with the corresponding side surface of the annular support 1021. This facilitates the removal of impurities from the electromagnetic chuck 1022 and prevents the formation of corners between the electromagnetic chuck 1022 and the annular support 1021, which could lead to dirt accumulation.

[0101] Preferably, the annular bracket 1021 is connected to the rotary drive mechanism 105 via a bracket shaft 104. The rotary drive mechanism 105 drives the bracket shaft 104 to rotate, thereby causing the annular bracket 1021 and the electromagnetic chuck 1022 on the annular bracket 1021 to rotate.

[0102] In one embodiment, the rotary drive mechanism 105 adopts a structure of motor + transmission assembly. The transmission assembly can be a chain drive, belt pulley drive, or the like. The motor is preferably a variable frequency motor, which can control the rotational speed of the ring support 1021.

[0103] Preferably, the electrical control unit includes multiple electrical control cables and an electrical control module. The number of electrical control cables is the same as that of the electromagnetic chuck 1022 and they are connected in a one-to-one correspondence. Each electrical control cable is electrically connected to the electrical control module.

[0104] In one embodiment, the bracket shaft 104 is a hollow shaft, and all the electrical control cables are routed through the hollow cavity of the bracket shaft 104. This method facilitates the laying of electrical control cables and provides high safety and reliability. Preferably, a cable routing hole is provided on the annular bracket 1021 (e.g., the inner ring bracket) to facilitate the entry of the electrical control cables into the bracket shaft 104; a cable routing channel is also provided in the electromagnetic chuck 1022 to connect the electrical control cables to the coil inside the electromagnetic chuck 1022.

[0105] Preferably, the annular bracket 1021 is detachably mounted on the bracket shaft 104. In one embodiment, the bracket shaft 104 is segmented, with the annular bracket 1021 clamped between two shaft segments 1041 of the bracket shaft 104 (generally, the inner annular bracket is clamped between the two shaft segments 1041 of the bracket shaft 104). Optionally, a shoulder is machined on the shaft segment 1041, and the two ends of the inner hole of the inner annular bracket adopt a stepped hole structure. The journal at the end of the shaft segment 1041 is inserted into the large-diameter hole in the corresponding stepped hole structure, and the shoulder of the shaft segment 1041 abuts against the corresponding end face of the inner annular bracket, and the two are fixed by screws.

[0106] Furthermore, during the assembly of the rotating shaft segment 1041 and the inner ring frame, the electromagnetic chuck 1022 can be further clamped between them. For example, the outer ring wall of the inner ring frame adopts a stepped shaft structure, and a clamping groove is formed between the shoulder of one of the rotating shaft segments 1041 and the large-diameter wall of the stepped shaft outer ring wall. The corresponding side end of the electromagnetic chuck 1022 is clamped in the clamping groove. This method can improve the stability and reliability of the installation of the electromagnetic chuck 1022. In particular, when the electrical control cable needs to enter the electromagnetic chuck 1022 through the bracket rotating shaft 104, the above structure can ensure the alignment accuracy between the wiring hole on the ring bracket 1021 and the wiring channel in the electromagnetic chuck 1022, thereby avoiding damage to the electrical control cable and other malfunctions.

[0107] In one embodiment, the electronic control module includes a central controller and a conductive slip ring. Each of the electronic control cables is connected to the rotor portion of the conductive slip ring, and the central controller is connected to the stator portion of the conductive slip ring. Preferably, the rotor portion of the conductive slip ring is mounted on the support shaft 104. Based on this structure, reliable control of the gain and loss of power to each electromagnetic chuck 1022 can be ensured when the electromagnetic chuck 1022 is rotating normally.

[0108] The aforementioned central control unit includes, but is not limited to, a PLC controller.

[0109] When the annular support 1021 drives each electromagnetic chuck 1022 to rotate, some electromagnetic chucks 1022 are immersed in the filter tank 101 from outside the filter tank 101, while some electromagnetic chucks 1022 leave the filter tank 101 and swing upwards. For the upward-swinging electromagnetic chucks 1022, ferromagnetic impurities are adsorbed on their surface. The liquid that is carried away and the liquid in the adsorbed impurities can leave the electromagnetic chucks 1022 under the action of gravity, thus achieving the effect of gravity dehydration. The impurities collected in the impurity collector 103 have a low water content, which not only facilitates the subsequent treatment of impurities, but also reduces the loss of liquid in the filter tank 101.

[0110] In one embodiment, such as Figure 9 and Figure 10 The filter disc 102 further includes a water-retaining ring 1023, which is coaxially mounted on the support shaft 104 and abuts against the disc surface of each electromagnetic chuck 1022. An annular water-retaining edge protrudes from the outer ring wall of the water-retaining ring 1023, and this annular water-retaining edge, together with each electromagnetic chuck 1022, forms a water-retaining groove. By setting the water-retaining ring 1023, the liquid can be effectively guided, preventing liquid from entering the support shaft 104 and other areas, thus avoiding interference with the normal operation of the electronic control unit.

[0111] Preferably, there are two water-blocking rings 1023, which are arranged on both sides of the annular support 1021.

[0112] Preferably, a sealing gasket can be sandwiched between the water-blocking ring 1023 and the electromagnetic chuck 1022 to improve the water-blocking effect.

[0113] At the impurity collection station, impurities can be scraped off the surface of the electromagnetic chuck 1022, or the surface of the electromagnetic chuck 1022 can be rinsed with high-pressure water or high-pressure air.

[0114] In one embodiment, such as Figures 8-10 The impurity removal unit includes a scraper 1031, the working end of which contacts the surface of an electromagnetic chuck 1022 located at the impurity collection position; the impurity collector 103 also includes an impurity collection groove 1032, which is connected to the lower part of the scraper 1031. This method has low energy consumption and high reliability.

[0115] Generally, both sides of the electromagnetic chuck 1022 can adsorb impurities. Therefore, it is preferable to provide a scraper 1031 and an impurity collection groove 1032 on both sides of the annular support 1021 respectively. The distance between the working ends of the scraper 1031 on both sides is preferably the same as the thickness of the electromagnetic chuck 1022.

[0116] Preferably, such as Figure 9 and Figure 10 The aforementioned scraper blade 1031 is arranged at an angle, which facilitates the scraped impurities falling into the impurity collection tank 1032.

[0117] Optionally, the working end of the scraper 1031 is its top end, which is preferably parallel to the horizontal plane. That is, the contact line between the scraper 1031 and the electromagnetic chuck 1022 is parallel to the horizontal plane. This method can facilitate the arrangement of the scraper 1031, the impurity collection tank 1032, etc., and facilitate the collection of impurities.

[0118] Preferably, the scraper 1031 is a grooved plate. The length direction of the scraper 1031 is defined as the direction from its working end to the impurity collection groove 1032. Wings are formed at the two transverse ends of the scraper 1031, which can better constrain and guide the scraped impurities.

[0119] As a preferred embodiment, such as Figure 9 and Figure 10 The filter discs 102 are in multiple sets, and each of the annular brackets 1021 is sequentially mounted on the same bracket shaft 104, which is connected to the rotary drive mechanism 105. Providing multiple sets of filter discs 102 can improve filtration efficiency and filtration effect.

[0120] like Figure 9 Two adjacent filter discs 102 can share a single impurity collection tank 1032.

[0121] Preferably, such as Figure 9 Multiple partitions are provided in the filter tank 101, and each partition divides the filter tank 101 into multiple liquid storage tanks 1011. Preferably, each liquid storage tank 1011 is provided with a filter plate 102. The number of filter plates 102 and liquid storage tanks 1011 is preferably the same and they are configured in a one-to-one correspondence.

[0122] In one embodiment, upstream wastewater can be allowed to enter each storage tank 1011 simultaneously.

[0123] In another embodiment, the storage tanks 1011 can be connected in series. Upstream wastewater first enters the first storage tank 1011, and the wastewater flows between the upstream and downstream storage tanks 1011 via overflow. This allows for continuous wastewater treatment in a streamlined manner, ensuring treatment effectiveness and efficiency. Figure 9 In the first liquid storage tank 1011, the filter plate 102 is preferably arranged close to the sewage inlet, which can capture ferromagnetic impurities in the sewage in the first time and improve the electromagnetic filtration effect; in the last liquid storage tank 1011, the filter plate 102 is preferably arranged close to the filtrate outlet, which can improve the cleanliness of the discharged filtrate.

[0124] In particular, based on the segmented design of the bracket shaft 104 described above, it is convenient to install and arrange each filter disc 102; the number of filter discs 102 can be increased or decreased as needed, so the flexibility is very high; and it is convenient to maintain the equipment, for example, the filter discs 102 at the corresponding liquid storage tank 1011 can be disassembled and assembled without affecting the filtration process in other liquid storage tanks 1011.

[0125] The method of using the electromagnetic filter 100 mentioned above includes:

[0126] The annular support 1021 drives the electromagnetic chucks 1022 to rotate, allowing the electromagnetic chucks 1022 to circulate between the working position, the dehydration position, and the impurity removal position.

[0127] In the working position, the electromagnetic chuck 1022 is energized and at least partially immersed in the filter tank 101 to adsorb ferromagnetic impurities in the filter tank 101.

[0128] In the dehydration position, the electromagnetic chuck 1022 remains energized;

[0129] At the impurity removal station, the electromagnetic chuck 1022 is de-energized, and the impurity removal unit removes the impurities from the electromagnetic chuck 1022 and collects them.

[0130] Example 9:

[0131] In Example 7, the alkaline solution circulation tank 11 is equipped with an iron sludge treatment subsystem, which is used to clean iron sludge impurities in the alkaline solution circulation tank 11 online, improve the system's operational stability and reliability as well as the cleaning quality of steel, and reduce downtime and frequency of sludge removal.

[0132] Preferably, the iron sludge treatment subsystem is connected to the circulation zone 111.

[0133] like Figure 11 and Figure 12 The iron sludge treatment subsystem includes an intermediate medium circulation mechanism and an iron sludge recovery mechanism. The intermediate medium circulation mechanism includes several intermediate media 330 capable of extracting iron sludge from the bottom of the alkaline solution circulation tank 11, and a medium conveying unit 331, a medium transfer unit 332, and a medium return unit 333 connected in sequence. The medium conveying unit 331 is connected to the intermediate medium outlet of the alkaline solution circulation tank 11, and the medium return unit 333 is connected to the intermediate medium inlet of the alkaline solution circulation tank 11. The iron sludge recovery mechanism includes a flushing unit arranged above the medium transfer unit 332 and an iron sludge collection box 321 arranged below the medium transfer unit 332.

[0134] In one embodiment, the intermediate medium 330 includes medium steel balls for entraining iron sludge, which can conveniently carry out the iron sludge from the bottom of the container. The iron sludge at the bottom of the container is entrained by the layered flowing steel balls and carried out of the alkali circulation tank 11 by the medium conveying unit 331. When the surface of the medium steel balls is designed to have a certain roughness, the iron sludge entrainment effect can be improved. In one embodiment, the surface roughness Ra of the medium steel balls is ≥0.8μm, and more preferably controlled to Ra≤12μm.

[0135] In one embodiment, such as Figure 11 The bottom of the alkaline solution circulation tank 11 is provided with a slope, which slopes from the intermediate medium inlet to the intermediate medium outlet, facilitating the flow of the intermediate medium 330 within the container. For example, the medium steel balls can move from the intermediate medium inlet to the intermediate medium outlet by gravity, and the medium steel balls at higher positions exert a squeezing and driving effect on the medium steel balls at lower positions and the iron sludge on the slope. Based on the circulation of the medium steel balls, the bottom of the container is always in motion, which can reduce the accumulation of iron sludge and thus save the intervention of power equipment. At the same time, the slope design also facilitates the deposition of iron sludge at the intermediate medium outlet, thereby making it easier for the intermediate medium 330 to carry the iron sludge out.

[0136] In one embodiment, the aforementioned medium conveying unit 331 employs a screw pump or a screw conveyor. Depending on the relative positional relationship between the intermediate medium outlet and the medium transfer unit 332, the screw pump or screw conveyor can be arranged at an angle or horizontally.

[0137] In one embodiment, such as Figure 11 and Figure 12 The media transfer unit 332 adopts a chain conveyor unit, such as a chain plate conveyor or a drag chain conveyor. Accordingly, the media transfer unit 332 includes an upper chain layer 3321 and a lower chain layer 3322.

[0138] In this case, the gap between the chain plates of the chain conveyor unit is smaller than the size of the intermediate medium 330, for example, smaller than the diameter of the medium steel ball.

[0139] The media conveying unit 331 is connected to the upper chain layer 3321. For example, the media output port of the media conveying unit 331 is located directly above the upper chain layer 3321, which can convey the intermediate media 330 to the upper chain layer 3321. Optionally, a hopper is arranged above the upper chain layer 3321 to receive the intermediate media 330 output by the media conveying unit 331 and transfer it to the upper chain layer 3321. This can prevent the intermediate media 330 from being ejected from the upper chain layer 3321 due to excessive drop distance.

[0140] The medium return unit 333 is located on the outlet side of the chain conveyor unit. Optionally, the medium return unit 333 is a conveyor roller conveyor used to transport the cleaned intermediate medium 330 back to the alkali circulation tank 11.

[0141] The rinsing unit is used to rinse the intermediate medium 330 on the medium transfer unit 332, thereby separating the iron sludge from the intermediate medium 330. In one embodiment, such as Figure 12 The rinsing unit includes a rinsing pipe 351, and at least one set of spray structures can be arranged at the bottom of the rinsing pipe 351. When there are multiple sets of spray structures, each spray structure is arranged sequentially along the conveying direction of the intermediate medium 330. Each set of spray structures includes at least one nozzle. When there are multiple nozzles in the spray structure, each nozzle in the spray structure is preferably arranged sequentially along the width direction of the medium transfer unit 332.

[0142] Furthermore, such as Figure 12 The rinsing unit further includes a rinsing fluid supply pipe 352, which is connected to the rinsing pipe 351 and is used to supply rinsing fluid. Preferably, the surface water of the alkali circulation tank 11 is used as the rinsing fluid, and correspondingly, the rinsing fluid supply pipe 352 is connected to the upper part of the alkali circulation tank 11.

[0143] The flushing fluid can exit via both sides of the media transfer unit 332, and / or, the media transfer unit 332 is a perforated conveying device, for example, it can exit via the gaps between the chain plates of the aforementioned chain conveyor unit. In one embodiment, such as Figure 11 and Figure 13The iron sludge recovery mechanism also includes a diversion unit 322, which is arranged between the upper chain layer 3321 and the lower chain layer 3322 of the media transfer unit 332. The top inlet of the diversion unit 322 is located directly below the flushing unit, and the bottom outlet of the diversion unit 322 is located directly above the iron sludge collection tank 321. Based on this design, the flushing fluid can be reliably diverted to the iron sludge collection tank 321, resulting in a cleaner on-site environment. Simultaneously, flushing water carrying iron sludge is prevented from contaminating the lower chain layer 3322, thereby improving the operational reliability of the media transfer unit 332 and reducing its maintenance frequency.

[0144] Preferably, such as Figure 11 and Figure 13 The aforementioned drainage unit 322 has an inverted Y-shaped structure, forming one drainage inlet pipe and two drainage outlet pipes. The two drainage outlet pipes can ensure the drainage efficiency and effect of the flushing fluid, and also facilitate the arrangement of the lower chain layer 3322, for example, the lower chain layer 3322 is located between the two drainage outlet pipes.

[0145] The upper chain layer 3321 can be arranged inside the inlet pipe, which can better capture the intermediate medium 330 and iron sludge splashed by the high-pressure jet.

[0146] Preferably, such as Figure 11 and Figure 13 The aforementioned diversion unit 322 is connected to the iron sludge collection box 321 to form an integral structure. For example, for the aforementioned inverted Y-shaped diversion unit 322, its outer frame 3221 is integrally formed with the iron sludge collection box 321 to form a top-closed box. An inverted V-shaped mud baffle 3222 is set inside the box, which correspondingly forms the inner frame of the diversion unit 322.

[0147] In one embodiment, a protective net 323 is also arranged around the upper chain layer 3321 of the media transfer unit 332, and the protective area of ​​the protective net 323 at least covers the rinsing area of ​​the upper chain layer 3321. By setting the protective net 323, the high-pressure jet can prevent the intermediate medium 330 from being ejected from the media transfer unit 332.

[0148] The protective net 323 can provide lateral protection. Optionally, the protective net 323 includes two side mesh panels 3231, which are respectively arranged on both sides of the conveying channel of the medium transfer unit 332. The side mesh panels 3231 are preferably not movable together with the medium transfer unit 332. For example, they are installed through mesh panel brackets. For the above-mentioned scheme with a diversion unit 322, the side mesh panels 3231 can also be installed on the outer frame 3221 of the diversion unit 322.

[0149] And / or, the protective net 323 can provide top protection. Optionally, the protective net 323 includes a top mesh panel 3232, which is installed above the media transfer unit 332. The top mesh panel 3232 is preferably not movable together with the media transfer unit 332, and its installation method can refer to the installation method of the side mesh panel 3231.

[0150] Further optimize the above-mentioned iron sludge treatment subsystem, such as Figure 11 and Figure 12 The iron sludge recycling mechanism also includes a filtration unit, and the iron sludge collection box 321 is provided with a flushing liquid recycling pipe connected to the filtration unit.

[0151] Optionally, the filtrate produced by the filtration unit can be reused as rinsing fluid. For example, the filtrate outlet pipe of the filtration unit is connected to a rinsing fluid storage tank, and the aforementioned rinsing fluid supply pipe 352 is also connected to the rinsing fluid storage tank. When the rinsing fluid is the surface water of the alkali circulation tank 11, the filtrate produced by the filtration unit can be returned to the alkali circulation tank 11, and correspondingly, the filtrate outlet pipe of the filtration unit is connected to the alkali circulation tank 11.

[0152] The iron sludge collection tank 321 can control the direction of the flushing fluid by overflow, and the aforementioned flushing fluid recovery pipe is connected to the overflow level of the iron sludge collection tank 321. Heavier impurities will settle at the bottom of the iron sludge collection tank 321 and can be cleaned periodically or irregularly.

[0153] In one embodiment, the filtration unit includes an electromagnetic filtration device for removing ferromagnetic impurities from the rinsing fluid, which can reliably adsorb and remove suspended ferromagnetic impurities in the rinsing fluid; the electromagnetic filtration device is preferably the electromagnetic filter 100 provided in Embodiment 3 above.

[0154] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An alkaline solution circulation tank, characterized in that: This includes a long-distance, maintenance-free mechanical defoaming device and an iron sludge treatment subsystem. The long-distance maintenance-free mechanical defoaming device includes a housing, a defoaming impeller for eliminating foam, and a motor for driving the defoaming impeller to rotate. The defoaming impeller is disposed within the housing, and the housing has a suction section for foam to enter the housing. The device is characterized by further including an impeller connecting shaft, on which the defoaming impeller is mounted. The impeller connecting shaft is coaxially connected to the motor shaft of the motor via a coaxial sealing assembly. A maintenance-free sealing assembly is also provided on the side of the coaxial sealing assembly near the suction section. The iron sludge treatment subsystem includes an intermediate medium circulation mechanism and an iron sludge recovery mechanism. The intermediate medium circulation mechanism includes several intermediate media capable of extracting iron sludge from the bottom of the alkaline solution circulation tank, and a medium conveying unit, a medium transfer unit, and a medium return unit connected in sequence. The medium conveying unit is connected to the intermediate medium outlet of the alkaline solution circulation tank, and the medium return unit is connected to the intermediate medium inlet of the alkaline solution circulation tank. The iron sludge recovery mechanism includes a flushing unit arranged above the medium transfer unit and an iron sludge collection box arranged below the medium transfer unit.

2. The alkali circulation tank as described in claim 1, characterized in that: The coaxial sealing assembly includes a coupling, through which the impeller connecting shaft and the motor shaft are coaxially connected.

3. The alkali circulation tank as described in claim 2, characterized in that: The coaxial sealing assembly also includes bearings for supporting the motor shaft and the impeller connecting shaft.

4. The alkali circulation tank as described in claim 3, characterized in that: The coaxial sealing assembly further includes a bearing cap for fixing the axial position of the bearing, the bearing cap being located between the coupling and the bearing.

5. The alkali circulation tank as described in claim 1, characterized in that: The impeller connecting shaft is equipped with a bearing sealing housing.

6. The alkali circulation tank as described in claim 1, characterized in that: The maintenance-free sealing assembly includes a dynamic and a static ring and a gravity block that can drive the dynamic and static rings to adhere to the motor shaft when stationary.

7. The alkali circulation tank as described in claim 6, characterized in that: It also includes an auxiliary impeller that can generate pressure in the opposite direction to the defoaming impeller, the auxiliary impeller being mounted on the motor shaft.

8. The alkali circulation tank as described in claim 1, characterized in that: The impeller connecting shaft is provided with a sliding bearing at the end away from the motor.

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