Combined strip degreasing system and method

Abstract

This invention relates to a combined strip degreasing system, comprising a pre-cleaning section, a dry degreasing section, and a post-cleaning section sequentially connected along the strip's running direction. Strip drying units are respectively installed at the strip outlets of the pre-cleaning section and the post-cleaning section. The invention also relates to a strip degreasing method based on the above system. In this invention, the combined degreasing process of the pre-cleaning section, dry degreasing section, and post-cleaning section enables efficient and reliable strip surface degreasing. Based on this combined degreasing process, only demineralized water is needed as the cleaning solution, meaning only physical degreasing methods are used, making it environmentally friendly.

Description

Technical Field

[0001] This invention belongs to the field of metallurgical production technology, specifically relating to a combined strip degreasing system and method. Background Technology

[0002] During the cold rolling process, lubrication and cooling are required, leaving an oil film and iron powder on the surface of the strip after rolling. Before annealing, the surface of the cold-rolled strip must be thoroughly cleaned; otherwise, quality defects such as furnace nodules and uneven coating may occur.

[0003] Currently, almost all cold rolling lines with annealing processes are equipped with dedicated degreasing sections. These degreasing sections generally consist of processes such as alkaline spraying, alkaline brushing, electrolytic cleaning, water brushing, multi-stage rinsing, and drying. Alkaline spraying, alkaline brushing, and electrolytic cleaning use chemical degreasing agents, which generate alkaline mist that is harmful to the environment. At the same time, the continuous discharge of alkaline wastewater also brings great pressure to environmental protection. The large amount of waste rinsing water generated in the rinsing section contains sodium or potassium salts and cannot be directly reused. The cost of online treatment and reuse is too high. Therefore, a large amount of rinsing wastewater is directly discharged to the wastewater treatment plant, resulting in a huge waste of water resources. Summary of the Invention

[0004] This invention relates to a combined strip degreasing system and method, which can at least solve some of the defects of the prior art.

[0005] This invention relates to a combined strip degreasing system, comprising a pre-cleaning section, a dry degreasing section, and a post-cleaning section connected sequentially along the strip running direction, wherein strip drying units are respectively provided at the strip outlet of the pre-cleaning section and the strip outlet of the post-cleaning section.

[0006] As one embodiment, the pre-cleaning section includes an immersion tank, a first high-pressure spray washing tank, at least one pre-brush washing tank, and a second high-pressure spray washing tank that are connected sequentially along the strip running direction.

[0007] As one embodiment, the pre-cleaning section is further equipped with a cleaning fluid circulation tank and a filtered water tank, and the pre-washing tank has two sections; the cleaning fluid outlets of the immersion tank, the first high-pressure spray washing tank, each of the pre-washing tanks and the second high-pressure spray washing tank are all connected to the circulation fluid inlet of the cleaning fluid circulation tank, the cleaning fluid inlets of the immersion tank and the first pre-washing tank are all connected to the circulation fluid outlet of the cleaning fluid circulation tank, and the cleaning fluid inlets of the first high-pressure spray washing tank, the second pre-washing tank and the second high-pressure spray washing tank are all connected to the filtered water outlet of the filtered water tank.

[0008] As one embodiment, the cleaning fluid circulation tank includes a circulation zone and a filtration zone that are interconnected. The circulation fluid inlet and the circulation fluid outlet are both located in the circulation zone. The filtration zone is connected to the filtration water inlet of the filtration water tank through a filtration pipeline, and a fine filtration mechanism is arranged on the filtration pipeline.

[0009] As one embodiment, a magnetic filter is arranged on the circulating fluid inlet pipe of the cleaning fluid circulation tank.

[0010] As one embodiment, the post-cleaning section includes at least one post-brush washing tank, a rinsing tank, and a final spray washing tank that are sequentially connected along the strip running direction.

[0011] As one embodiment, the post-washing section is also equipped with a rinsing circulation tank. The cleaning liquid inlets of the post-brush washing tank and the rinsing tank are connected to the rinsing water outlet of the rinsing circulation tank. The cleaning liquid outlets of the post-brush washing tank, the rinsing tank, and the final spray washing tank are all connected to the rinsing water inlet of the rinsing circulation tank.

[0012] As one implementation method, the dry degreasing section is equipped with a laser degreasing device and / or a plasma degreasing device.

[0013] As one embodiment, both the pretreatment section and the posttreatment section include a brush washing tank, and at least part of the brush rollers in the brush washing tank are made of bristles with low surface energy.

[0014] The present invention also provides a strip degreasing method, implemented based on the above-described combined strip degreasing system, the strip degreasing method comprising:

[0015] S1, the strip is treated by the pre-cleaning section, and the surface of the strip after treatment is dried by the strip drying unit;

[0016] S2, the strip enters the dry degreasing section for treatment, which removes or transforms the residual oil film on the surface of the strip into an easy-to-clean substance.

[0017] S3, the strip enters the post-cleaning section for processing, and the surface of the processed strip is dried by the strip drying unit in order to proceed with the subsequent production process.

[0018] The present invention has at least the following beneficial effects:

[0019] In this invention, a combined degreasing process of pre-cleaning section - dry degreasing section - post-cleaning section is adopted, which can perform strip surface degreasing operation efficiently and reliably; based on the combined degreasing process, only demineralized water is needed for cleaning, that is, only physical degreasing means are used, which is green and environmentally friendly. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the combined strip degreasing system provided in an embodiment of the present invention;

[0022] Figure 2 This is a side view of the electromagnetic filter provided in an embodiment of the present invention;

[0023] Figure 3 This is a top view of the electromagnetic filter provided in an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the front view structure of an electromagnetic filter provided in an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the iron sludge treatment subsystem provided in an embodiment of the present invention;

[0026] Figure 6 for Figure 5 Top view;

[0027] Figure 7 This is a schematic diagram of the iron sludge collection box provided in an embodiment of the present invention. Detailed Implementation

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below. 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.

[0029] Example 1

[0030] like Figure 1 This invention provides a combined strip degreasing system, comprising a front cleaning section, a dry degreasing section 7 and a rear cleaning section connected sequentially along the strip running direction, wherein a strip drying unit 6 is provided at the strip outlet of the front cleaning section and the strip outlet of the rear cleaning section respectively.

[0031] In this embodiment, a combined degreasing process of pre-cleaning section - dry degreasing section 7 - post-cleaning section is adopted, which can perform strip surface degreasing operation efficiently and reliably.

[0032] In one embodiment, such as Figure 1 The pre-cleaning section includes an immersion tank 1, a first high-pressure spray washing tank 2, at least one pre-brush washing tank and a second high-pressure spray washing tank 5, which are connected sequentially along the running direction of the strip.

[0033] Among them, such as Figure 1 The immersion tank 1 is preferably a vertical tank. A guide roller is installed at the inlet and outlet of the immersion tank 1, and a submerged roller is installed at the bottom. The strip passes sequentially around the inlet guide roller, the submerged roller, and the outlet guide roller. The running trajectory of the strip in the immersion tank 1 is basically vertical. In one embodiment, the temperature of the cleaning solution in the immersion tank 1 is ~85°C; the cleaning solution preferably enters from the bottom of the immersion tank 1 and overflows from the top.

[0034] Preferably, the immersion tank 1 adopts ultrasonic immersion cleaning, and the ultrasonic transducer is preferably distributed on both sides of the running trajectory of the strip. Under the action of ultrasound, the strip heats up rapidly, preferably to a temperature close to that of the cleaning solution, which greatly reduces the viscosity and adhesion of the grease on the surface of the strip, making it easier to remove the grease and creating better conditions for subsequent degreasing.

[0035] The first high-pressure spray washing tank 2 is used to rinse the entire surface of the strip with high-pressure cleaning fluid, which can quickly remove a considerable portion of the grease and iron powder from the strip surface. Preferably, the pressure of the high-pressure cleaning fluid is controlled at 30-50 MPa, for example, around 40 MPa, to ensure the rinsing effect. Support rollers are provided in the first high-pressure spray washing tank 2, and preferably, a high-pressure spray beam is provided at each support roller.

[0036] The second high-pressure spray washing tank 5 is used to rinse the entire strip surface again with high-pressure cleaning fluid. Combined with the brushing action of the previous brush washing tank and the high-pressure rinsing action, oil stains and other adhering substances and iron powder on the surface of the strip can be further removed. Preferably, the pressure of the high-pressure cleaning fluid is controlled at 30-50 MPa, for example, around 40 MPa, to ensure the rinsing effect. The second high-pressure spray washing tank 5 is equipped with support rollers, preferably with a high-pressure spray beam at each support roller.

[0037] In one embodiment, the front brush washing tank has two sections, including a first front brush washing tank 3 and a second front brush washing tank 4. Preferably, as shown... Figure 1 The first front brush washing tank 3 and the first high-pressure spray washing tank 2 are openly connected, for example, they share a tank or the tanks of the two are integrally formed; the second front brush washing tank 4 and the second high-pressure spray washing tank 5 are openly connected, for example, they share a tank or the tanks of the two are integrally formed. This method can not only improve the compactness of the system layout, but also facilitate the control of the cleaning fluid.

[0038] The first front washing tank 3 and the second front washing tank 4 are connected by a throat channel, which facilitates the passage of the strip and effectively isolates the environment between the two front washing tanks. Preferably, a squeeze roller is provided at the outlet of the first front washing tank 3.

[0039] In particular, such as Figure 1 The immersion tank 1, the first high-pressure spray washing tank 2, and the first front brush washing tank 3 are openly connected. For example, an irregularly shaped cleaning tank is used, which includes a vertical tank and a horizontal tank. The vertical tank is configured as the immersion tank 1 described above. High-pressure spray washing equipment and brush washing equipment are arranged in the horizontal tank to form the first high-pressure spray washing tank 2 and the first front brush washing tank 3 described above. Based on this structure, the cleaning fluid in the first high-pressure spray washing tank 2 and the first pre-brush washing tank 3 can flow by gravity into the immersion washing tank 1. On the one hand, this allows for the tiered utilization of the cleaning fluid, saving on consumption. Furthermore, the immersion washing tank 1 maintains an overflow level, ensuring effective immersion washing and saving energy consumption for supplying cleaning fluid to it. On the other hand, it facilitates the circulation control of the cleaning fluid, especially when immersion washing, spray washing, and brush washing share a single cleaning fluid circulation tank 11. It also facilitates the collection and cleaning of the removed sludge; for example, most of the sludge in the horizontal tank can be carried by the cleaning fluid to the immersion washing tank 1 for deposition. In particular, when the cleaning fluid falls from the horizontal tank into the immersion washing tank 1, it creates a certain turbulence effect, thereby improving the cleaning effect on the strip steel. Additionally, the vertical and horizontal tanks are connected in an open manner, allowing for smoother and safer strip passage. The cleaning tank has a very compact structure, effectively saving space.

[0040] Preferably, brushing and spraying are performed alternately in the front washing tank to ensure the removal effect and efficiency of oil stains and iron powder on the strip surface. Accordingly, brush rollers and spraying beams are alternately arranged in the front washing tank along the strip running direction.

[0041] In one embodiment, such as Figure 1 The pre-cleaning section is also equipped with a cleaning fluid circulation tank 11 and a filter water tank 12. The cleaning fluid outlets of the immersion tank 1, the first high-pressure spray washing tank 2, each of the pre-brush washing tanks and the second high-pressure spray washing tank 5 are all connected to the circulation fluid inlet of the cleaning fluid circulation tank 11. The cleaning fluid inlets of the immersion tank 1 and the first pre-brush washing tank 3 are all connected to the circulation fluid outlet of the cleaning fluid circulation tank 11. The cleaning fluid inlets of the first high-pressure spray washing tank 2, the second pre-brush washing tank 4 and the second high-pressure spray washing tank 5 are all connected to the filter water outlet of the filter water tank 12.

[0042] In this embodiment, based on the combined degreasing process, only demineralized water is needed as the cleaning solution; that is, this embodiment only uses physical degreasing methods, which is green and environmentally friendly. The filter tank 12 is equipped with a water supply pipe 18, which is connected to the demineralized water source.

[0043] Preferably, a magnetic filter 15 is arranged on the inlet pipe of the cleaning fluid circulation tank 11 to filter the cleaning fluid returning from the cleaning tank, remove impurities such as iron sludge, effectively extend the service life and cleaning effect of the cleaning fluid, and reduce the maintenance frequency of the cleaning fluid circulation tank 11 and the spray beam.

[0044] Among them, such as Figure 1 Preferably, the immersion tank 1, the first high-pressure spray tank 2 and the first pre-brush tank 3 share a common circulating liquid inlet pipe, and the second pre-brush tank 4 and the second high-pressure spray tank 5 share a common circulating liquid inlet pipe. Magnetic filters 15 are respectively provided on the two circulating liquid inlet pipes.

[0045] The inlet pipe of the cleaning fluid circulation tank 11 is preferably connected to the top of the tank, and the outlet pipe of the cleaning fluid circulation tank 11 is preferably located at the bottom of the cleaning fluid circulation tank 11.

[0046] In one embodiment, such as Figure 1 The cleaning fluid circulation tank 11 includes a circulation zone 111 and a filtration zone 112 that are interconnected. The circulation fluid inlet and the circulation fluid outlet are both located in the circulation zone 111. The filtration zone 112 is connected to the filtration water inlet of the filtration water tank 12 through a filtration pipeline, and a fine filtration mechanism 16 is arranged on the filtration pipeline.

[0047] The cleaning fluid circulation tank 11 is divided into sections, which facilitates the treatment of the cleaning fluid and improves the cleanliness of the cleaning fluid flowing to the filter water tank 12. Preferably, as follows... Figure 1 The circulation zone 111 and the filtration zone 112 are separated by two partitions. The first partition is located at the junction of the circulation zone 111 and the filtration zone 112, extending upwards from the bottom of the tank at the junction to a certain distance from the top of the tank. The second partition extends downwards from the top of the circulation zone 111 to the bottom of the tank near the circulation zone 111. The two partitions are adjacent and spaced apart, forming a baffled channel. While the cleaning fluid flows into the filtration zone 112 by gravity, it facilitates the deposition of sludge in the circulation zone 111. Based on the above structure, the difference in inlet and outlet flow rates of the cleaning fluid circulation tank 11 caused by the addition of filter pipelines can be avoided, ensuring the stability of the cleaning fluid circulation flow rate.

[0048] In one embodiment, the fine filtration mechanism 16 includes a first filtration device and a second filtration device. The first filtration device is an ultra-oleophobic microfilter. In the ultra-oleophobic microfilter, an ultra-oleophobic coating is applied to the outer surface of the microfiltration membrane tube. The ultra-oleophobic coating has the characteristics of being oleophobic and having low surface tension, which makes it relatively easy to remove sludge adhering to its surface and will not cause problems such as membrane tube blockage and failure.

[0049] Furthermore, the superoleophobic microfilter is equipped with a regeneration mechanism, which can extend its service life and improve its operational reliability and filtration effect. In one embodiment, the regeneration mechanism includes a flushing pipe that communicates with the lumen of the microfiltration membrane tube; and / or, the regeneration mechanism includes a purge pipe that communicates with the inner cavity of the superoleophobic microfilter housing and faces the outer wall of the microfiltration membrane tube. Because the outer surface of the microfiltration membrane tube is coated with a superoleophobic coating, the microfiltration membrane tube can be quickly regenerated by backflushing inside the membrane tube and / or by purgering outside the membrane tube. The flushing pipe is connected to a flushing water source; the purge pipe is connected to a purge air source, such as compressed air.

[0050] Furthermore, the filter outlet of the superoleophobic microfilter is connected to an oil sludge pressing device, which can achieve deep dehydration of the oil sludge. The dehydrated oil sludge is easy to transport and process directly.

[0051] The second filtration device described above preferably employs a barrier membrane filter, which can achieve deep oil removal and further filtration of impurities such as iron sludge. Preferably, this barrier membrane filter uses an HK barrier membrane, which has extremely strong oleophobic properties. When an oily cleaning solution under certain pressure tries to pass through the HK barrier membrane, water molecules on the feed side can exchange with water molecules inside the membrane, while hydrophobic dispersed substances such as oil cannot exchange with the associated water inside the membrane and are selectively blocked. The barrier oil removal process can be quantitatively designed, has high oil removal accuracy, requires no backwashing during operation, is not limited by the oil content of the incoming water, resists large oil volume impacts, and has a water recovery rate of up to 99% or more. The waste oil blocked by the barrier membrane filter can be discharged into a collection container or collection tank.

[0052] The fine filtration mechanism 16 described above can remove most of the oil and iron powder in the cleaning solution (in this embodiment, the removal rate can reach more than 95%), ensuring the cleanliness of the cleaning solution in the filter tank 12, thereby ensuring the cleaning effect of the relevant equipment and the safety of equipment use.

[0053] The cleaning fluid circulation tank 11 is equipped with a circulation pump on the circulation outlet pipe and a filter water pump on the filter pipe. The circulation pump and / or filter water pump is preferably a variable frequency pump, which can be used to match the dynamic balance of the inflow and outflow of the cleaning fluid circulation tank 11 by adjusting the pump speed.

[0054] The filter water tank 12 supplies clean cleaning fluid to the first high-pressure spray washing tank 2, the second front brush washing tank 4, and the second high-pressure spray washing tank 5, which can ensure the working reliability of the first high-pressure spray washing tank 2, the second front brush washing tank 4, and the second high-pressure spray washing tank 5, and reduce the probability of blockage of the high-pressure pump group 17. The use of clean cleaning fluid in the second front brush washing tank 4 and the second high-pressure spray washing tank 5 can also further ensure the cleanliness of the strip surface.

[0055] Preferably, a squeeze roller can be arranged at the outlet of the second high-pressure spray washing tank 5, which, together with the strip drying unit 6 on its outlet side, can improve the surface dryness of the strip. The strip drying unit 6 mentioned above includes, but is not limited to, an air knife device.

[0056] Preferably, both the filter water tank 12 and the cleaning fluid circulation tank 11 are equipped with heaters to heat and maintain the temperature of the cleaning fluid, resulting in better cleaning performance. Specifically, in the cleaning fluid circulation tank 11, the heater may be arranged only in the circulation zone 111.

[0057] In one embodiment, the dry degreasing section 7 is equipped with a laser degreasing device and / or a plasma degreasing device, which can remove the oil film remaining on the surface of the strip. In the dry degreasing section 7, the oil film on the surface of the strip can be removed or transformed into an easily removable substance by using laser burning at a specific frequency or plasma decomposition. Even trace amounts of oil film that are difficult to be washed away by cleaning solution or brushing can be easily removed.

[0058] In one embodiment, such as Figure 1 The post-cleaning section includes at least one post-brush washing tank 8, a rinsing tank 9, and a final spray washing tank 10 connected sequentially along the strip running direction.

[0059] The structure of the rear brush washing tank 8 can refer to the structure of the front brush washing tank, and will not be described in detail here. Preferably, a section of the rear brush washing tank 8 is used, and a squeeze roller is preferably arranged at the outlet of the rear brush washing tank 8.

[0060] Preferably, such as Figure 1 The rinsing tank 9 and the final spray washing tank 10 are open and connected, for example, they share a tank or the tanks of the two are integrally formed.

[0061] The cleaning process in the rinsing tank 9 and the final spray washing tank 10 ensures the surface cleanliness of the exported strip steel, and the strip surface has minimal residue after drying. In one embodiment, the rinsing tank 9 is equipped with multiple sets of rinsing spray pipes; the final spray washing tank 10 is equipped with one or more sets of final spray washing pipes.

[0062] More preferably, such as Figure 1 The post-washing section is also equipped with a rinsing circulation tank 13. The cleaning liquid inlets of the post-brush washing tank 8 and the rinsing tank 9 are all connected to the rinsing water outlet of the rinsing circulation tank 13. The cleaning liquid outlets of the post-brush washing tank 8, the rinsing tank 9 and the final spray washing tank 10 are all connected to the rinsing water inlet of the rinsing circulation tank 13.

[0063] The cleaning solution in the rinsing circulation tank 13 is preferably the same as the cleaning solution in the cleaning solution circulation tank 11, for example, both are demineralized water.

[0064] Preferably, such as Figure 1 The cleaning fluid inlet of the final spray washing tank 10 is connected to the filtered water outlet of the aforementioned filter water tank 12. That is, the cleaning fluid is supplied to the final spray washing tank 10 through the filter water tank 12, which can ensure the cleanliness of the strip surface after final spray washing and can also serve as makeup water for the rinsing circulation tank 13.

[0065] In one embodiment, such as Figure 1 The rinsing circulation tank 13 is equipped with a partition plate that extends upwards from the bottom of the tank to a certain distance from the top, thereby dividing the rinsing circulation tank 13 into interconnected scrubbing liquid area and rinsing liquid area. Preferably, the scrubbing liquid inlet pipe and scrubbing liquid outlet pipe of the post-scrubbing tank 8 are both connected to the scrubbing liquid area, and the rinsing liquid inlet pipe and rinsing liquid outlet pipe of the rinsing circulation tank 13 are both connected to the rinsing liquid area. The above structure can largely ensure the partitioning of scrubbing liquid and rinsing liquid, thereby ensuring the scrubbing and rinsing effect. The spray flow rate in the rinsing tank 9 and the final spray washing tank 10 is preferably greater than the spray flow rate in the post-scrubbing tank 8, and the final spray washing tank 10 is supplied with water from an external source. Therefore, in the rinsing liquid area, in addition to its own rinsing liquid circulation, there will also be an overflow flow towards the scrubbing liquid area, which can form a tiered utilization of the cleaning liquid.

[0066] More preferably, such as Figure 1 The rinsing circulation tank 13 is equipped with a return water pipe, which is connected to the filtration zone 112 of the cleaning fluid circulation tank 11 to realize the circulation of the cleaning fluid in the later cleaning section. Preferably, the return water pipe is connected to the scrubbing fluid zone to achieve a tiered flow in the rinsing circulation tank 13, which can save power.

[0067] Preferably, the rinsing circulation tank 13 is equipped with a heater, which can heat and keep the cleaning solution warm, and the heated cleaning solution can achieve better cleaning results.

[0068] Preferably, a squeeze roller can be arranged at the outlet of the final spray washing tank 10, which, together with the strip drying unit 6 on its outlet side, can improve the surface dryness of the strip. The strip drying unit 6 includes, but is not limited to, the use of an air knife device.

[0069] For the aforementioned front and rear brush washing tanks 8, at least some of the brush rollers in the brush washing tanks are made of bristles with low surface energy, so that the oil stains adhering to the bristles can be easily removed under the impact of water flow, ensuring the cleaning effect.

[0070] Each tank is equipped with a mist exhaust port connected to a mist exhaust pipe to discharge the high-temperature water mist generated during the degreasing process. In one embodiment, such as... Figure 1The aforementioned strip degreasing system is also equipped with a droplet condenser 14, and each mist exhaust pipe is connected to the droplet condenser 14. Under the action of circulating cooling water, the water vapor generated by splashing and evaporation can be recovered to the maximum extent. More preferably, the condensate outlet pipe of the droplet condenser 14 is connected to the cleaning fluid circulation tank 11, and the condensate is collected in the cleaning fluid circulation tank 11 for recycling.

[0071] As can be seen, the strip degreasing system provided in this embodiment can achieve complete reuse of cleaning fluid, achieving near-zero emissions and significant energy saving and consumption reduction effects.

[0072] Example 2

[0073] This embodiment provides a strip degreasing method, implemented based on the combined strip degreasing system provided in Embodiment 1 above. The strip degreasing method includes:

[0074] S1, the strip is treated by the pre-cleaning section, and the surface of the strip after treatment is dried by the strip drying unit 6.

[0075] S2, the strip enters the dry degreasing section 7 for treatment, which removes or transforms the residual oil film on the surface of the strip into an easy-to-clean substance.

[0076] S3, the strip enters the post-cleaning section for processing, and the surface of the processed strip is dried by the strip drying unit 6 in order to proceed with the subsequent production process.

[0077] The specific implementation steps have been described in the above embodiment one, and will not be repeated here.

[0078] Example 3

[0079] This embodiment provides an electromagnetic filter 100, which can be used in the above embodiment 1 as the magnetic filter 15 therein.

[0080] like Figures 2-4 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 removing impurities from the electromagnetic chucks 1022.

[0081] 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.

[0082] Optionally, such as Figure 2 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.

[0083] The electromagnetic chuck 1022 is preferably detachably mounted on the annular bracket 1021, including but not limited to fixing with screws.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] The aforementioned central control unit includes, but is not limited to, a PLC controller.

[0093] 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.

[0094] In one embodiment, such as Figure 3 and Figure 4The 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.

[0095] Preferably, there are two water-blocking rings 1023, which are arranged on both sides of the annular support 1021.

[0096] Preferably, a sealing gasket can be sandwiched between the water-blocking ring 1023 and the electromagnetic chuck 1022 to improve the water-blocking effect.

[0097] 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.

[0098] In one embodiment, such as Figures 2-4 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.

[0099] 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.

[0100] Preferably, such as Figure 3 and Figure 4 The aforementioned scraper blade 1031 is arranged at an angle, which facilitates the scraped impurities falling into the impurity collection tank 1032.

[0101] 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.

[0102] 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.

[0103] As a preferred embodiment, such as Figure 3 and Figure 4 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.

[0104] like Figure 3 Two adjacent filter discs 102 can share a single impurity collection tank 1032.

[0105] Preferably, such as Figure 3 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.

[0106] In one embodiment, upstream wastewater can be allowed to enter each storage tank 1011 simultaneously.

[0107] 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 3 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.

[0108] 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.

[0109] The method of using the electromagnetic filter 100 mentioned above includes:

[0110] 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.

[0111] 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.

[0112] In the dehydration position, the electromagnetic chuck 1022 remains energized;

[0113] 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.

[0114] Example 4

[0115] This embodiment further optimizes the first embodiment described above. Specifically, the cleaning fluid circulation tank 11 is equipped with an iron sludge treatment subsystem, which is used to clean iron sludge impurities in the cleaning fluid circulation tank 11 online, thereby improving the system's operational stability and reliability, as well as the cleaning quality of the steel, and reducing downtime for sludge removal.

[0116] Preferably, the iron sludge treatment subsystem is connected to the circulation zone 111.

[0117] like Figure 5 and Figure 6 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 cleaning fluid 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 cleaning fluid circulation tank 11, and the medium return unit 333 is connected to the intermediate medium inlet of the cleaning fluid circulation tank 11. The iron sludge recovery mechanism includes a rinsing unit arranged above the medium transfer unit 332 and an iron sludge collection box 321 arranged below the medium transfer unit 332.

[0118] In one embodiment, the intermediate medium 330 includes medium steel balls for entraining iron sludge, which can conveniently carry out the iron sludge at 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 cleaning fluid 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.

[0119] In one embodiment, such as Figure 5The bottom of the cleaning fluid 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 in 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.

[0120] 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.

[0121] In one embodiment, such as Figure 5 and Figure 6 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.

[0122] 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.

[0123] 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.

[0124] The media return unit 333 is located on the outlet side of the chain conveyor unit. Optionally, the media return unit 333 is a conveyor roller conveyor used to transport the cleaned intermediate media 330 back to the cleaning fluid circulation tank 11.

[0125] 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 6The 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.

[0126] Furthermore, such as Figure 6 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, surface water from the cleaning fluid 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 cleaning fluid circulation tank 11.

[0127] 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 5 and Figure 7 The 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.

[0128] Preferably, such as Figure 5 and Figure 7 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.

[0129] 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.

[0130] Preferably, such as Figure 5 and Figure 7The 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.

[0131] 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.

[0132] 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.

[0133] 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.

[0134] Further optimize the above-mentioned iron sludge treatment subsystem, such as Figure 5 and Figure 6 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.

[0135] 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 cleaning fluid circulation tank 11, the filtrate produced by the filtration unit can flow back into the cleaning fluid circulation tank 11, and correspondingly, the filtrate outlet pipe of the filtration unit is connected to the cleaning fluid circulation tank 11.

[0136] 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.

[0137] 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.

[0138] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A combined strip degreasing system, characterized by: The front cleaning section, the dry oil removal section and the rear cleaning section are sequentially connected along the strip running direction, and a strip drying unit is arranged at the strip outlet of the front cleaning section and the strip outlet of the rear cleaning section respectively. The front cleaning section comprises, sequentially connected along the strip running direction, an immersion tank, a first high-pressure spray tank, at least one front brush cleaning tank and a second high-pressure spray tank. The immersion tank adopts a vertical tank, and an entry and an exit of the immersion tank are respectively provided with a deflection roller, and a submerged roller is arranged at the bottom, and the strip sequentially passes through the entry deflection roller, the submerged roller and the exit deflection roller. The immersion tank, the first high-pressure spray tank and the first front brush cleaning tank are open and communicated, wherein a special-shaped cleaning tank is adopted, the special-shaped cleaning tank comprises a vertical tank body and a horizontal tank body, the vertical tank body constitutes the immersion tank, and high-pressure spray equipment and brush cleaning equipment are arranged in the horizontal tank body to constitute the first high-pressure spray tank and the first front brush cleaning tank; cleaning liquid in the first high-pressure spray tank and the first front brush cleaning tank can flow into the immersion tank.

2. The combination strip degreasing system of claim 1 wherein: The front cleaning section is further provided with a cleaning liquid circulating tank and a filtered water tank, and the front brush cleaning tank has two sections; the cleaning liquid outlets of the immersion tank, the first high-pressure spray tank, each front brush cleaning tank and the second high-pressure spray tank are communicated with the circulating liquid inlet of the cleaning liquid circulating tank, the cleaning liquid inlets of the immersion tank and the first front brush cleaning tank are communicated with the circulating liquid outlet of the cleaning liquid circulating tank, and the cleaning liquid inlets of the first high-pressure spray tank, the second front brush cleaning tank and the second high-pressure spray tank are communicated with the filtered water outlet of the filtered water tank.

3. The combination strip degreasing system of claim 2, wherein: The cleaning liquid circulating tank comprises a circulating area and a filtering area which are communicated with each other, the circulating liquid inlet and the circulating liquid outlet are arranged in the circulating area, the filtering area is connected with the filtered water inlet of the filtered water tank through a filtering pipeline, and a fine filtering mechanism is arranged on the filtering pipeline.

4. The combination strip degreasing system of claim 2, wherein: A magnetic filter is arranged on the circulating liquid inlet pipe of the cleaning liquid circulating tank.

5. The combination strip degreasing system of claim 1 wherein: The rear cleaning section comprises, sequentially connected along the strip running direction, at least one rear brush cleaning tank, a rinsing tank and a final spray tank.

6. The combination strip degreasing system of claim 5, wherein: The rear cleaning section is further provided with a rinsing circulating tank, the cleaning liquid inlets of the rear brush cleaning tank and the rinsing tank are communicated with the rinsing water outlet of the rinsing circulating tank, and the cleaning liquid outlets of the rear brush cleaning tank, the rinsing tank and the final spray tank are communicated with the rinsing water inlet of the rinsing circulating tank.

7. The combination strip degreasing system of claim 1 wherein: The dry oil removal section is provided with a laser oil removal device and / or a plasma oil removal device.

8. The combination strip degreasing system of claim 1 wherein: The front cleaning section and the rear cleaning section both comprise brush cleaning tanks, and brush rollers in at least part of the brush cleaning tanks adopt brush hairs with low surface energy.

9. A strip degreasing method characterized by, The combination type strip degreasing system is implemented based on any one of claims 1 to 8, and the strip degreasing method comprises: S1, the strip is treated in the front cleaning section, and the surface of the treated strip is dried by the strip drying unit; S2, the strip enters the dry oil removal section for treatment, and residual oil film on the surface of the strip is removed or changed into a substance easy to clean; S3, the strip enters the rear cleaning section for treatment, and the surface of the treated strip is dried by the strip drying unit so as to be subjected to subsequent production.

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