A SED ecological descaling system for thin gauge steel sheets

Abstract

This invention provides a SED ecological descaling system for thin-gauge steel plates, designing a steel plate descaling technology field. High-pressure water and abrasive are mixed inside the descaling nozzle to form a high-pressure abrasive jet, which then impacts the steel strip surface. Relying on the impact grinding of the abrasive and the water wedge effect of the high-pressure water, the oxide scale and rust on the steel plate surface are removed. The continuous arrangement of four descaling units allows for full-width descaling coverage of the steel plate as it is conveyed, and the system is finished by a rinsing unit to improve the overall descaling effect. The wastewater and waste sand generated during descaling can be recycled and reused through a sand sorting and recovery system, a water circulation system, and a sand circulation system. This achieves graded recovery and recycling of the abrasive, and sedimentation, filtration, and reuse of the wastewater, significantly improving the abrasive recovery rate and wastewater reuse rate, realizing an ecological resource recycling descaling effect.

Description

Technical Field

[0001] This invention relates to the field of steel plate descaling technology, and in particular to an SED eco-friendly descaling system for thin-gauge steel plates. Background Technology

[0002] Thin-gauge steel sheets, as a core basic material in automobile manufacturing, electronic component processing and other fields, will form a surface layer after hot rolling. Inner layer and If the dense oxide scale, which is mainly on the outer layer, cannot be completely removed efficiently and with low damage, it will directly affect the processing accuracy and surface quality of subsequent cold rolling, coating and other processes, becoming a key bottleneck restricting the high-end application of thin-gauge steel plates.

[0003] To address the aforementioned technical challenges, the industry has gradually developed water-sand circulation descaling equipment, attempting to improve the ecological and economic efficiency of descaling through the recycling of abrasives and water. However, existing circulation descaling equipment still suffers from numerous design shortcomings: for example, the cleaning box of the descaling unit is mostly a single sand and water inlet structure, with a single supply path for sand and water, making it impossible to achieve independent supply for sand sorting and recycling, which easily leads to poor abrasive grading effect, low recycling rate, and increased abrasive consumption costs; moreover, the wastewater and waste sand reuse rate is low, and abrasive recovery is incomplete, failing to achieve truly ecological descaling.

[0004] Therefore, it is necessary to propose an SED eco-friendly descaling system for thin-gauge steel plates to address or at least mitigate the aforementioned defects. Summary of the Invention

[0005] The main objective of this invention is to provide an SED eco-friendly descaling system for thin-gauge steel plates to solve the problems in the prior art.

[0006] To achieve the above objectives, the present invention provides an SED ecological descaling system for thin-gauge steel plates, comprising a steel plate conveying system, a recycling pool, and a descaling system, wherein the descaling system is disposed on one side of the steel plate conveying system; wherein, The recycling pool is used to collect the sand-water mixture after descaling, and it is located on the other side of the steel plate conveying system; The descaling system includes four descaling units arranged sequentially from the steel plate conveying direction and one rinsing unit. The rinsing unit is used to rinse away residual impurities on the steel plate. Each descaling unit includes a cleaning box, a jet assembly, a sand sorting and recovery system, a water circulation system, and a sand circulation system. The cleaning box has a discharge port, a water inlet, a first sand inlet, and a second sand inlet. One end of the jet assembly is connected to the discharge port, and the other end of the jet assembly is directed toward the steel plate conveying system with an adjustable spray angle. The two ends of the sand sorting and recovery system are respectively connected to the recovery pool and the first sand inlet of the cleaning box. The two ends of the water circulation system are respectively connected to the water inlet of the recovery pool and the cleaning box. The two ends of the sand circulation system are respectively connected to the second sand inlet of the recovery pool and the cleaning box.

[0007] Preferably, the sand sorting and recovery system includes a cyclone pump and a hydrocyclone. One end of the cyclone pump is connected to the recovery tank to receive the sand-water mixture after descaling, and the other end of the cyclone pump is connected to the hydrocyclone. The discharge end of the hydrocyclone is connected to the first sand inlet of the cleaning box to sort and utilize the sand.

[0008] Preferably, the water circulation system includes a sedimentation tank, a sewage pump, a filter, an intermediate water tank, and a high-pressure pump. The sedimentation tank is connected to the recovery tank to receive the sand-water mixture after descaling. The sewage pump is connected to the sedimentation tank. The sewage pump, the filter, the intermediate water tank, and the high-pressure pump are connected in sequence from the direction of water flow. The outlet of the high-pressure pump is connected to the inlet of the cleaning tank to output purified high-pressure water to the cleaning tank.

[0009] Preferably, the sand circulation system includes a sand pump and an abrasive tank. One end of the sand pump is connected to the recovery pool, and the other end of the sand pump is connected to the abrasive tank. The discharge end of the abrasive tank is connected to the second sand inlet of the cleaning box.

[0010] Preferably, the jet assembly includes a nozzle frame, a water supply pipe, and multiple descaling nozzles spaced apart along the conveying direction of the steel plate. The nozzle frame is hinged to the cleaning box and is internally connected to the cleaning box via a flexible hose. The descaling nozzles are connected to the nozzle frame via the water supply pipe and face the steel plate conveying system.

[0011] Preferably, the descaling nozzle includes a converging section, a cylindrical section, and an expanding section. The large-diameter end of the converging section is connected to the water supply pipe. The two ends of the cylindrical section are respectively connected to the small-diameter ends of the converging section and the expanding section. The cylindrical section also has multiple spiral guide vanes arranged at intervals along the extension direction of the cylindrical section. The large-diameter end of the expanding section is used to jet the water towards the steel plate.

[0012] Preferably, the hydrocyclone is also connected to the sedimentation tank via a connecting pipe to remove wastewater and oxide scale.

[0013] Preferably, the sand pump is also connected to the sedimentation tank via a connecting pipe for receiving settled sand from the sedimentation tank.

[0014] Preferably, the four descaling units are staggered vertically along the conveying direction of the steel plate.

[0015] Preferably, the descaling range of each descaling unit is W / 4; where W is the width of the steel plate along the conveying direction.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides an SED ecological descaling system for thin-gauge steel plates, comprising a steel plate conveying system, a recovery tank, and a descaling system. The descaling system is located on one side of the steel plate conveying system, and the recovery tank, which collects the sand-water mixture after descaling, is located on the other side of the steel plate conveying system. The descaling system includes four descaling units arranged sequentially from the steel plate conveying direction and one rinsing unit. The rinsing unit is used to rinse residual impurities on the steel plate. Each descaling unit includes a cleaning box, a jet assembly, a sand sorting and recovery system, a water circulation system, and a sand circulation system. The cleaning box has a discharge port, a water inlet, a first sand inlet, and a second sand inlet. One end of the jet assembly is connected to the discharge port, and the other end of the jet assembly faces the steel plate conveying system with an adjustable spray angle. The two ends of the sand sorting and recovery system are respectively connected to the recovery tank and the first sand inlet of the cleaning box. The two ends of the water circulation system are respectively connected to the recovery tank and the water inlet of the cleaning box. The two ends of the sand circulation system are respectively connected to the recovery tank and the second sand inlet of the cleaning box. The high-pressure water and abrasive mix inside the descaling nozzle to form a high-pressure abrasive jet, which then impacts the surface of the steel strip. Relying on the impact grinding of the abrasive and the water wedge effect of the high-pressure water, the oxide scale and rust on the surface of the steel plate are removed. The continuous arrangement of the four descaling units can achieve full coverage descaling of the steel plate width as the steel plate is conveyed, and the washing unit finishes the process to improve the overall descaling effect. The wastewater and waste sand generated by descaling can be recycled and reused in stages through the media circulation of the sand sorting and recovery system, water circulation system, and sand circulation system. This achieves graded recovery and recycling of abrasive and sedimentation, filtration, and reuse of wastewater, greatly improving the abrasive recovery rate and wastewater reuse rate, and realizing the effect of ecological resource recycling descaling. Attached Figure Description

[0017] 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 the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of an application scenario of the overall system in one embodiment of the present invention; Figure 2This is a partial schematic diagram of a descaling unit in one embodiment of the present invention; Figure 3 This is a schematic diagram of the connection of the descaling unit in one embodiment of the present invention; Figure 4 This is a cross-sectional schematic diagram of a descaling nozzle in one embodiment of the present invention.

[0019] The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0020] Explanation of icon numbers: 10. Steel plate conveying system; 20. Recycling tank; 30. Descaling system; 310. Cleaning box; 320. Jet assembly; 321. Nozzle frame; 322. Water supply pipe; 323. Descaling nozzle; 3231. Contraction section; 3232. Cylindrical section; 3233. Expansion section; 3234. Spiral guide vane; 324. Hose; 331. Swirl pump; 332. Hydrocyclone; 341. Sedimentation tank; 342. Sewage pump; 343. Filter; 344. Intermediate water tank; 345. High-pressure pump; 351. Sand pump; 352. Abrasive tank; 360. Flushing unit. Detailed Implementation

[0021] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0022] 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 a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0023] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0024] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0025] Please see the appendix Figure 1-4 An embodiment of the present invention provides an SED ecological descaling system 30 for thin-gauge steel plates, comprising a steel plate conveying system 10, a recycling pool 20, and a descaling system 30. The descaling system 30 is disposed on one side of the steel plate conveying system 10, and its specific configuration is as follows: The recovery pool 20 is used to collect the sand-water mixture after descaling and is located on the other side of the steel plate conveying system 10. The descaling system 30 includes four descaling units arranged sequentially from the steel plate conveying direction and a rinsing unit 360. The rinsing unit 360 is used to rinse residual impurities on the steel plate. Each descaling unit includes a cleaning box 310, a jet assembly 320, a sand sorting and recovery system, a water circulation system, and a sand circulation system. The cleaning box 310 has a discharge port, a water inlet, a first sand inlet, and a second sand inlet. The sand inlet has one end of the jet assembly 320 connected to the outlet, and the other end of the jet assembly 320 is positioned facing the steel plate conveying system 10 with an adjustable spray angle. The two ends of the sand sorting and recovery system are respectively connected to the first sand inlet of the recovery pool 20 and the cleaning box 310. The two ends of the water circulation system are respectively connected to the water inlets of the recovery pool 20 and the cleaning box 310. The two ends of the sand circulation system are respectively connected to the second sand inlet of the recovery pool 20 and the cleaning box 310.

[0026] Specifically, the SED ecological descaling system 30 for thin-gauge steel plates in this application includes a steel plate conveying system 10, a recovery tank 20, and a descaling system 30. The steel plate conveying system 10 is used to convey steel plates, and the descaling system 30 is used to perform surface descaling on the conveyed steel plates. It is located on one side of the steel plate conveying system 10, so that the steel plates can undergo jet descaling by the descaling system 30 as they pass through. The recovery tank 20 is used to recover the wastewater mixture (including sewage, waste sand, and oxide scale removed during descaling) generated after descaling. Therefore, the recovery tank 20 is located on the other side of the steel plate conveying system 10. By separating the descaling system 30 and the recovery tank 20 on both sides of the steel plate conveying system 10, spatial separation and efficient connection between descaling operation and media recovery are achieved. Each descaling unit is equipped with an independent cleaning box 310, jet assembly 320, and... The system comprises three major systems: sand sorting and recovery, water circulation, and sand circulation. The cleaning box 310 is designed with independent discharge, water inlet, first sand inlet, and second sand inlet, creating three independent media transport paths for water supply, sand sorting and recovery supply, and sand circulation supply. Simultaneously, the jet assembly 320 features an adjustable spray angle to accommodate the descaling needs of thin steel plates of varying thicknesses. The impact angle can be adjusted according to the degree of scale adhesion on the steel plate, ensuring thorough descaling while avoiding excessive impact that could damage the steel plate substrate or cause deformation. Structurally, the system achieves independent operation and coordinated cooperation among its various systems. Through the sequential arrangement of four descaling units and one rinsing unit 360, a complete "continuous descaling + terminal rinsing" operation chain is constructed. This effectively removes residual impurities from the steel plate surface after descaling, improving the surface cleaning quality and meeting the process requirements of subsequent cold rolling, coating, and other processes.

[0027] In a preferred embodiment of the present invention, the sand sorting and recycling system includes a cyclone pump 331 and a hydrocyclone 332. One end of the cyclone pump 331 is connected to the recycling tank 20 to receive the sand-water mixture after descaling. The other end of the cyclone pump 331 is connected to the hydrocyclone 332. The discharge end of the hydrocyclone 332 is connected to the first sand inlet of the cleaning box 310 to sort and utilize the sand.

[0028] It should be noted that the cyclone separator 331 extracts and transports the sand-water mixture in the recycling tank 20. Relying on the centrifugal separation action of the hydrocyclone 332, the abrasive in the sand-water mixture is graded and separated. The centrifugal separation method has high separation accuracy and can effectively screen out reusable abrasive, improve the abrasive recycling rate, reduce the consumption of new abrasive, and reduce the production raw material cost. Thus, qualified abrasive that meets the particle size requirements is separated and transported to the first sand inlet of the cleaning box 310 through the discharge end of the hydrocyclone 332, realizing the precise separation and recycling of abrasive.

[0029] In a preferred embodiment of the present invention, the water circulation system includes a sedimentation tank 341, a wastewater pump 342, a filter 343, an intermediate water tank 344, and a high-pressure pump 345. The sedimentation tank 341 is connected to the recovery tank 20 to receive the sand-water mixture after descaling. The wastewater pump 342 is connected to the sedimentation tank 341. The wastewater pump 342, the filter 343, the intermediate water tank 344, and the high-pressure pump 345 are connected in sequence from the direction of water flow. The outlet of the high-pressure pump 345 is connected to the inlet of the cleaning tank 310 to output purified high-pressure water to the cleaning tank 310.

[0030] It is important to note that the sedimentation tank 341 performs preliminary sedimentation on the sand-water mixture transported from the recovery tank 20, achieving initial separation of sand, water, and scale. The settled wastewater is then pumped out by the wastewater pump 342 and sequentially filtered and temporarily stored through the filter 343 and intermediate water tank 344. Finally, the high-pressure pump 345 pressurizes the water to create high-pressure water, which is then transported to the inlet of the cleaning tank 310. This establishes a complete water cycle of "sedimentation-filtration-pressurization-reuse," achieving wastewater purification and reuse. This multi-stage wastewater purification process effectively removes impurities from the water. Scaling, fine particulate impurities, etc., ensure the cleanliness of the reused high-pressure water, preventing impurities from entering the jet assembly 320 and causing nozzle and pipeline blockage, thus improving the stability of equipment operation; the high-pressure pump 345 can provide high-pressure water with appropriate pressure according to the descaling requirements of thin steel plates, and form a high-pressure abrasive jet with the abrasive to meet the descaling pressure requirements of thin steel plates of different thicknesses; thereby, the consumption of fresh water is greatly reduced through the recycling of wastewater, the amount of wastewater discharged per ton of steel plate is significantly reduced, the production water cost and environmental treatment cost are reduced, and the ecological utilization of water resources is realized.

[0031] In a preferred embodiment of the present invention, the sand circulation system includes a sand pump and an abrasive tank 352. One end of the sand pump is connected to the recovery pool 20, and the other end of the sand pump is connected to the abrasive tank 352. The discharge end of the abrasive tank 352 is connected to the second sand inlet of the cleaning box 310.

[0032] It is worth noting that the sand pump extracts the settled sand from the recovery tank 20 and sedimentation tank 341 and transports it to the abrasive tank 352. After the abrasive is temporarily stored and homogenized in the abrasive tank 352, it is transported to the second sand inlet of the cleaning box 310, forming a closed-loop cycle of abrasive from recovery, temporary storage to resupply, creating a dual sand supply path with the sand sorting and recovery system. The temporary storage and homogenization function of the abrasive tank 352 ensures a stable supply of abrasive into the cleaning box 310, keeping the water-sand mixing ratio within the optimal range, ensuring stable impact force of the high-pressure abrasive jet, and improving the consistency of descaling effect. The dual sand supply path further improves the recycling rate of abrasive, maximizing the recycling and reuse of abrasive. Combined with the use of steel slag abrasive, it truly achieves the ecological goal of "treating waste with waste". The closed-loop cycle of abrasive reduces the amount of abrasive purchased externally, significantly reducing raw material procurement costs.

[0033] In a preferred embodiment of the present invention, the jet assembly 320 includes a nozzle frame 321, a water supply pipe 322, and a plurality of descaling nozzles 323 spaced apart along the conveying direction of the steel plate. The nozzle frame 321 is hinged to the cleaning box 310 and is internally connected to the cleaning box 310 through a hose 324. The descaling nozzles 323 are connected to the nozzle frame 321 through the water supply pipe 322 and face the steel plate conveying system 10.

[0034] It is worth noting that the nozzle holder 321 connects to the cleaning box 310 and is hinged to the ear plate to allow rotation, thereby adjusting the jet angle of the descaling nozzle 323. A hose 324 connects to the interior of the cleaning box 310 to provide a stable high-pressure abrasive jet medium to the descaling nozzle 323. The hose 324 can bend slightly to accommodate vertical bending during angle adjustment. The water supply pipe 322 transports the medium between the nozzle holder 321 and each descaling nozzle 323. Multiple descaling nozzles 323 are spaced apart along the steel plate conveying direction to achieve descaling of the steel plate. The multi-point jet coverage on the surface and the spaced arrangement of multiple descaling nozzles 323 expand the descaling coverage of a single jet assembly 320. With the coordinated operation of four descaling units, it achieves all-round jet coverage in the width direction of the steel plate, with no dead corners in descaling. At the same time, the spray angle of each descaling nozzle 323 can be adjusted up and down to adapt to the descaling needs of different working conditions. The spray angle can be precisely adjusted according to the scale adhesion of different areas of the steel plate. While ensuring the scale removal effect, it maximizes the protection of the thin steel plate substrate, reduces the risk of plate deformation, and improves the plate shape qualification rate.

[0035] Furthermore, the descaling nozzle 323 includes a converging section 3231, a cylindrical section 3232, and an expanding section 3233. The large-diameter end of the converging section 3231 is connected to the water supply pipe 322. The two ends of the cylindrical section 3232 are respectively connected to the small-diameter ends of the converging section 3231 and the small-diameter ends of the expanding section 3233. The cylindrical section 3232 also has a plurality of spiral guide vanes 3234 arranged at intervals along the extension direction of the cylindrical section 3232. The large-diameter end of the expanding section 3233 is used to jet the water towards the steel plate.

[0036] It should be noted that the contraction section 3231 rapidly increases the flow velocity of the high-pressure water jet by contracting its cross-section, forming a negative pressure to adsorb the abrasive and achieving initial mixing of water and sand; the spiral guide vanes 3234 built into the cylindrical section 3232 cause the water-sand mixture to form turbulence, promoting full and uniform mixing of water and sand, and the cylindrical section 3232 provides a stable mixing space for water-sand mixing; the expansion section 3233 reduces the jet resistance by expanding its cross-section, improves the outflow efficiency and impact range of the high-pressure abrasive jet, and finally forms a uniform and stable high-pressure abrasive jet to strike the surface of the steel plate. The combination of the three-section structure of "contraction-cylindrical-expansion" and the spiral guide vane 3234 improves the uniformity of water-sand mixing, effectively solving the problem of jet impact force fluctuation caused by uneven water-sand mixing in traditional nozzles, and improving the oxide scale removal rate. The reduction of jet resistance increases the effective impact distance and impact force of the jet, further improving the descaling efficiency. The uniform high-pressure abrasive jet avoids excessive local impact, making the cleaning effect on the steel plate surface more uniform and meeting the high-precision surface requirements of thin steel plates.

[0037] Furthermore, the hydrocyclone 332 is also connected to the sedimentation tank 341 via a connecting pipe to remove sewage and oxide scale.

[0038] It should be understood that the wastewater containing scale and fine particulate impurities generated after hydrocyclone 332 separation is transported to sedimentation tank 341 via a connecting pipe, achieving complete separation of the separated wastewater from the qualified abrasives, and allowing the wastewater to enter the sedimentation stage of the water circulation system for unified treatment. This avoids the mixing and recirculation of separated wastewater with qualified abrasives, ensuring the purity of the abrasives output from the sand separation and recovery system and improving the efficiency of abrasive reuse. The unified treatment of wastewater in sedimentation tank 341 achieves centralized collection of impurities and unified purification of wastewater, simplifies the system's media treatment process, improves the overall system's collaborative operating efficiency, and effectively prevents impurities from entering subsequent pipelines and causing blockages, thus improving equipment operational stability.

[0039] Furthermore, the sand pump is also connected to the sedimentation tank 341 via a connecting pipe for receiving sediment in the sedimentation tank 341.

[0040] It should be noted that the connecting pipe allows the sand pump to extract the sediment from the sedimentation tank 341, bringing the abrasive separated in the sedimentation tank 341 into the sand circulation system's recovery scope. This achieves abrasive recovery in both the recovery tank 20 and the sedimentation tank 341. This maximizes the extraction of usable abrasive from the sand-water mixture, increasing the abrasive recovery rate, further reducing abrasive waste, and lowering raw material costs. Timely extraction of sediment from the sedimentation tank 341 prevents sediment accumulation, ensuring the sedimentation effect of the sedimentation tank 341, improving the wastewater purification efficiency of the water circulation system, and reducing the frequency of sludge removal from the sedimentation tank 341, thus reducing equipment maintenance workload.

[0041] Furthermore, the four descaling units are staggered vertically along the conveying direction of the steel plate.

[0042] It is important to note that by staggering the vertical arrangement of the four descaling units, the jet areas of the four units are superimposed in a gradient along the width of the steel plate. This changes the coverage method of a single planar jet and achieves three-dimensional jet descaling of the steel plate surface. The staggered jet coverage effectively avoids jet blind spots on the steel plate surface, ensuring descaling without dead angles along the width of the steel plate and improving the comprehensiveness and thoroughness of descaling. The gradient jet method allows the oxide scale on the steel plate surface to be impacted by jets from multiple directions and angles, making it easier to peel off the scale and improve descaling efficiency. At the same time, it disperses the jet impact force at a single point, avoiding damage to the steel plate substrate caused by excessive local impact.

[0043] Furthermore, the descaling range of each descaling unit is W / 4; where W is the width of the steel plate along the conveying direction.

[0044] Understandably, when the steel plate passes through a descaling unit in sequence, N is completed. The cleaning range is W / 4, where N=1, 2, 3, 4. When the entire area is completely covered, descaling is achieved. The standardized descaling range design makes the layout of descaling units more standardized and precise, ensuring that there is no overlap or waste of coverage when the four descaling units work together, and no missing areas of coverage, thus achieving optimal allocation of jet resources. The precise full-coverage design ensures that the descaling effect is consistent throughout the entire width of the steel plate, avoiding the problem of incomplete descaling in some areas, improving the uniformity of the surface cleaning quality of the steel plate, and meeting the surface consistency requirements of subsequent processing of thin steel plates.

[0045] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A SED eco-friendly descaling system for thin-gauge steel plates, characterized in that, The system includes a steel plate conveying system, a recycling pool, and a descaling system, wherein the descaling system is located on one side of the steel plate conveying system; wherein, The recycling pool is used to collect the sand-water mixture after descaling, and it is located on the other side of the steel plate conveying system; The descaling system includes four descaling units arranged sequentially from the steel plate conveying direction and one rinsing unit. The rinsing unit is used to rinse away residual impurities on the steel plate. Each descaling unit includes a cleaning box, a jet assembly, a sand sorting and recovery system, a water circulation system, and a sand circulation system. The cleaning box has a discharge port, a water inlet, a first sand inlet, and a second sand inlet. One end of the jet assembly is connected to the discharge port, and the other end of the jet assembly is directed toward the steel plate conveying system with an adjustable spray angle. The two ends of the sand sorting and recovery system are respectively connected to the recovery pool and the first sand inlet of the cleaning box. The two ends of the water circulation system are respectively connected to the water inlet of the recovery pool and the cleaning box. The two ends of the sand circulation system are respectively connected to the second sand inlet of the recovery pool and the cleaning box.

2. The SED eco-friendly descaling system for thin-gauge steel plates according to claim 1, characterized in that, The sand sorting and recycling system includes a cyclone pump and a hydrocyclone. One end of the cyclone pump is connected to the recycling tank to receive the sand-water mixture after descaling, and the other end of the cyclone pump is connected to the hydrocyclone. The discharge end of the hydrocyclone is connected to the first sand inlet of the cleaning box to sort and utilize the sand.

3. The SED eco-friendly descaling system for thin-gauge steel plates according to claim 2, characterized in that, The water circulation system includes a sedimentation tank, a sewage pump, a filter, an intermediate water tank, and a high-pressure pump. The sedimentation tank is connected to the recovery tank to receive the sand-water mixture after descaling. The sewage pump is connected to the sedimentation tank. The sewage pump, the filter, the intermediate water tank, and the high-pressure pump are connected in sequence from the direction of water flow. The outlet of the high-pressure pump is connected to the inlet of the cleaning tank to output purified high-pressure water to the cleaning tank.

4. The SED eco-friendly descaling system for thin-gauge steel plates according to claim 3, characterized in that, The sand circulation system includes a sand pump and an abrasive tank. One end of the sand pump is connected to the recovery pool, and the other end of the sand pump is connected to the abrasive tank. The discharge end of the abrasive tank is connected to the second sand inlet of the cleaning box.

5. The SED eco-friendly descaling system for thin-gauge steel plates according to claim 1, characterized in that, The jet assembly includes a nozzle frame, a water supply pipe, and multiple descaling nozzles spaced apart along the conveying direction of the steel plate. The nozzle frame is hinged to the cleaning box and is internally connected to the cleaning box via a flexible hose. The descaling nozzles are connected to the nozzle frame via the water supply pipe and face the steel plate conveying system.

6. The SED eco-friendly descaling system for thin-gauge steel plates according to claim 5, characterized in that, The descaling nozzle includes a converging section, a cylindrical section, and an expanding section. The large-diameter end of the converging section is connected to the water supply pipe. The two ends of the cylindrical section are respectively connected to the small-diameter ends of the converging section and the expanding section. The cylindrical section also has multiple spiral guide vanes arranged at intervals along the extension direction of the cylindrical section. The large-diameter end of the expanding section is used to jet the water towards the steel plate.

7. The SED eco-friendly descaling system for thin-gauge steel plates according to claim 3, characterized in that, The hydrocyclone is also connected to the sedimentation tank via a connecting pipe to remove wastewater and oxide scale.

8. The SED eco-friendly descaling system for thin-gauge steel plates according to claim 4, characterized in that, The sand pump is also connected to the sedimentation tank via a connecting pipe to receive sediment in the sedimentation tank.

9. The SED eco-friendly descaling system for thin-gauge steel plates according to claim 1, characterized in that, The four descaling units are staggered vertically along the conveying direction of the steel plate.

10. The SED eco-friendly descaling system for thin-gauge steel plates according to claim 1, characterized in that, The descaling range of each descaling unit is W / 4; where W is the width of the steel plate along the conveying direction.

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