A screening structure for dredging soil particle sorting and a screening method thereof

Abstract

The application discloses a screening structure for dredging soil particle separation and a screening method thereof, relates to the technical field of soil particle screening structure, and aims at solving the problems that the existing dredging screening is mostly arranged with many water pipes in a soil stockyard, the flow between soil particles is accelerated through water flow, and the particle grading is improved, however, the method is high in cost and the actual effect is not very ideal. The inside of the screening pool is provided with a first baffle, one side of the upper end of the first baffle is provided with a second baffle, one side of the first baffle is provided with a first separation groove, the other side of the first baffle is provided with a second separation groove, one side of the inside of the screening pool is fixedly provided with a third baffle, one side of the third baffle is provided with a first particle scraping mechanism, one end of the inside of the screening pool, close to a feeding groove, is provided with a second particle scraping mechanism, and one end of the inside of the screening pool, close to a fine soil discharging groove, is provided with a third particle scraping mechanism.

Description

Technical Field

[0001] This invention relates to the field of soil particle screening structure technology, and in particular to a screening structure and screening method for separating dredged soil particles. Background Technology

[0002] To improve the water quality of lakes and rivers and enhance their navigation and flood discharge capacity, dredging of underwater sediment is necessary, resulting in a large amount of dredged silt. Since domestic dredging primarily uses cutter suction dredging, the resulting dredged silt has extremely high water content. During its transport to the stockpile, hydraulic separation occurs, leading to uneven particle size distribution and variations in the physical and mechanical properties of the dredged silt at different locations within the stockpile. In the laboratory, sieving is mainly used to separate soil particles. However, sieving requires pretreatment such as drying and grinding of the soil sample. Furthermore, due to limitations in sieve mesh size, sieving is difficult to separate soil particles smaller than 63 μm.

[0003] Existing methods typically involve arranging numerous fine water pipes in the dredged soil stockpile to accelerate the flow between soil particles, thereby improving particle size distribution. However, this method is not only costly but also not very effective. When the dredged soil slurry has a water content of 400% to 800%, significant particle sorting occurs, with the mass fraction of coarse particles gradually increasing with depth. Therefore, we propose a screening structure and method for dredged soil particle sorting to address the aforementioned problems. Summary of the Invention

[0004] The purpose of this invention is to provide a screening structure and screening method for dredged soil particle sorting, in order to solve the problem mentioned in the background art that most existing dredging screening methods involve arranging many fine water pipes in the soil dump to accelerate the flow between soil particles through water flow, thereby improving particle size distribution. However, this method is not only costly but also not very effective.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a screening structure for separating dredged soil particles, comprising a screening tank, a feed chute at one end of the rear side of the screening tank, a fine soil discharge chute at one end of the front side of the screening tank, a coarse soil discharge chute at the middle position of one side of the screening tank, a first baffle inside the screening tank, a second baffle on one side of the upper part of the first baffle, a first sorting chute on one side of the first baffle, and a second sorting chute on the other side of the first baffle, a third baffle fixedly installed on one side of the screening tank, a first scraping mechanism on one side of the third baffle, lead screws on two opposite inner walls of the screening tank, a second scraping mechanism on one side of the screening tank near the feed chute, and a third scraping mechanism on one side of the screening tank near the fine soil discharge chute. One end of the second and third scraping mechanisms is slidably connected to one side of the first baffle.

[0006] Preferably, a feed pipe is sealed to one side of the feed trough, a first discharge pipe is sealed to one side of the fine soil discharge trough, a second discharge pipe is sealed to one side of the coarse soil discharge trough, a three-way valve is sealed to one end of the feed pipe, a first discharge pipe is sealed to the other side of the three-way valve, a second discharge valve is sealed to one end of the first discharge pipe, and a first discharge valve is sealed to one end of the second discharge pipe.

[0007] Preferably, the first baffle and the second baffle are fixedly connected by a fixing rod, and five fixing rods are equally spaced. The ends of the first baffle and the second baffle that are close to the fine soil discharge chute are inclined toward the fine soil discharge chute.

[0008] Preferably, a groove is provided at the lower end of the other side of the first baffle, and a magnetic slider is slidably arranged inside the groove. The first scraping mechanism includes a scraping frame, a scraping plate, a scraping plate groove, a guiding groove, a drive rod sleeve, a drive rod, a scraping mechanism drive motor, a sliding block, a rotating seat, a guiding groove baffle, a guiding groove, and a magnetic strip. The second and third scraping mechanisms both include a scraping frame, a scraping plate, a scraping plate groove, a guiding groove, a drive rod sleeve, and a sliding block.

[0009] Preferably, the scraper plate is located on one side of the scraper frame, and the scraper frame has a scraper plate groove inside. One end of the scraper plate extends into the scraper plate groove and is slidably connected to it. Two electric telescopic cylinders for scraping mechanisms are symmetrically arranged inside the scraper plate groove. One end of each electric telescopic cylinder is fixedly connected to the inner wall of the scraper plate groove, and the other end is fixedly connected to the scraper plate. The drive rod sleeve is located on the other side of the scraper frame. A drive rod is provided inside the drive rod sleeve of the first scraper mechanism, and the upper and lower ends of the drive rod extend to the outside of the drive rod sleeve. A scraper mechanism drive motor is provided below the drive rod sleeve of the first scraper mechanism, and the output end of the drive motor is connected to the drive rod via a key. A sliding block is fitted on the outer transmission sleeve of the lead screw. The sliding block of the first scraper mechanism is rotatably connected to the drive rod sleeve via a rotating seat, and the scraper mechanism drive motor is fixedly connected to the lower end of the rotating seat. The drive rod sleeves of the second and third scraper mechanisms are fixedly connected to the sliding block.

[0010] Preferably, one end of the scraper plate of the first scraper mechanism is provided with a magnetic strip, and the magnetic strip is magnetically connected to the magnetic slider. The scraper plates of the second and third scraper mechanisms are slidably connected to one side of the first baffle.

[0011] Preferably, the upper and lower ends of the third baffle are respectively provided with first baffle sleeves. A third baffle fixing hook is fixedly provided on one side above the first baffle sleeve, and the lower end of the third baffle fixing hook extends into the interior of the first baffle sleeve. A baffle electric telescopic cylinder is fixedly installed below the third baffle fixing hook. Two first baffle sleeves are provided between the two first baffle sleeves. A shrinking block is provided between the first baffle sleeves and between the two first baffle sleeves. An electric telescopic cylinder groove is provided on one side inside the first baffle sleeve, the shrinking block, and the first baffle sleeve. The baffle electric telescopic cylinder is located inside the electric telescopic cylinder groove. The lower end of the baffle electric telescopic cylinder is fixedly connected to the inner wall of the electric telescopic cylinder groove of the lower first baffle sleeve. A second shrinking block groove is provided inside the first baffle sleeve. First shrinking block grooves are symmetrically opened at the upper and lower ends of the first baffle sleeve. The upper end of the upper shrinking block is slidably connected to the second shrinking block groove, and the lower end of the lower shrinking block is slidably connected to the second shrinking block groove. The shrinking block is slidably connected to the first shrinking block groove.

[0012] Preferably, the front end of the scraping frame and the guiding groove is provided with a grain-guiding groove, and the rear end of the scraping frame and the guiding groove is provided with a guiding groove, and the grain-guiding groove and the guiding groove are connected. The rear end of the scraping frame and the guiding groove are rotatably connected with a guiding groove baffle. The height of the grain-guiding groove gradually decreases from the end away from the guiding groove to the other end.

[0013] Preferably, the upper end of the second baffle is higher than the first baffle, and the lower end of the second baffle is lower than the first baffle.

[0014] A screening method for a screening structure used for separating dredged soil particles includes the following steps:

[0015] Step 1: Fix the screening structure in place, open the inflow three-way valve, the first discharge valve and the second discharge valve, and inject water into the screening tank through the feed pipe according to the volume of dredged soil to be processed until the water level in the first sorting tank is above the height of the first baffle. At the same time, the total amount of water injected should ensure that the dredged soil slurry has a slurry moisture content of 400% to 800%. Then, the dredged soil to be processed flows into the first sorting tank at a uniform speed through the feed pipe and the feed trough.

[0016] Step 2: In the first sorting tank, due to the different particle sizes of the dredged soil, there will be obvious particle stratification, causing fine particles and suspended impurities to float on the top, while coarse particles are mainly concentrated at the bottom. During the flow of dredged soil particles, some coarse particles will flow out from the gap between the first and second baffles with the action of water flow. Due to the obstruction of the second baffle, most of the fine soil particles and suspended impurities are at the top. Due to the placement of the third baffle, a vortex will be formed near the fine soil discharge chute. Due to the action of the vortex, fine soil particles and some suspended impurities will be attracted and flow into the fine soil discharge chute, thus achieving screening.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. This invention can initially separate coarse-grained soil from fine-grained soil. The device can control the particle size of the separated soil particles by controlling the moisture content of the dredged soil slurry and the closing time of the baffle plate; ensuring controllable and effective separation. It has a simple structure, generates minimal noise and vibration during use, provides a good working environment, and is highly adaptable. This invention is not only suitable for separating dredged soil particles but can also be used to separate other types of soil, greatly expanding its applicability. It solves the problem that existing dredging screening methods mostly involve arranging many fine water pipes in the soil stockpile to accelerate the flow between soil particles and improve particle size distribution; however, this method is not only costly but also not very effective.

[0019] 2. This invention, by setting up a first scraping mechanism, a second scraping mechanism, and a third scraping mechanism, can respectively scrape off the dredged soil particles settled inside the first and second sorting tanks. The scraping mechanism drive motor of the first scraping mechanism drives the scraping frame and scraping plate to rotate until they are parallel to the third baffle. By extending the electric telescopic cylinder of the scraping mechanism, the scraping plate extends out of the scraping plate groove. At this time, the magnetic slider and magnetic strip attract each other due to magnetic force. Driven by the screw on one side of the first scraping mechanism, the first scraping mechanism moves towards the fine soil discharge trough. Due to the particle guide trough and The particle guide trough, when used in conjunction with the first scraping mechanism, can transport the dredged soil particles from the side of the fine soil discharge trough near the first scraping mechanism to the other side of the first scraping mechanism. The first scraping mechanism is then driven to move towards the feed trough by the reversing screw, pushing the dredged soil particles into the feed trough. Then, the second and third scraping mechanisms are driven to move towards the discharge trough by the screws on one side of the second and third scraping mechanisms. The dredged soil particles in the second sorting trough are then output through the second discharge pipe. Reducing the amount of dredged soil particles that settle inside the screening tank can effectively improve the efficiency of subsequent sorting operations. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 This is a perspective view of the third baffle in this invention;

[0022] Figure 3 This is a schematic diagram of the structure of the third baffle in this invention;

[0023] Figure 4 This is a three-dimensional schematic diagram of the connection between the first baffle and the second baffle in this invention;

[0024] Figure 5 This is a diagram showing the connection relationship between the first scraping mechanism and the screening tank in this invention;

[0025] Figure 6 In this invention Figure 5 Enlarged view of area A;

[0026] Figure 7 In this invention Figure 5 BB direction sectional view.

[0027] In the diagram: 1. Screening tank; 2. Feed chute; 3. Fine soil discharge chute; 4. Coarse soil discharge chute; 5. Feed pipe; 6. First discharge pipe; 7. Second discharge pipe; 8. Three-way valve; 9. First particle discharge pipe; 10. First discharge valve; 11. Second discharge valve; 12. First sorting tank; 13. Second sorting tank; 14. First baffle; 15. Second baffle; 16. Third baffle; 17. First scraping mechanism; 18. Second scraping mechanism; 19. Third scraping mechanism; 20. First particle retaining sleeve; 21. Shrinkage block; 22. First particle retaining sleeve; 23. Electric telescopic cylinder for baffle; 24. Electric telescopic cylinder groove; 25. First shrinkage block groove; 26. Second shrinkage block groove; 27. Fixed rod; 28. Scraping frame; 29. ​​Scraping plate; 30. Scraping plate groove; 31. Particle guide groove; 32. Drive rod sleeve; 33. Drive rod; 34. Drive motor for scraping mechanism; 35. Lead screw; 36. Sliding block; 37. Rotating seat; 38. Baffle for particle guide groove; 39. Particle guide groove; 40. Fixed hook for third baffle; 41. Electric telescopic cylinder for scraping mechanism; 42. Slide groove; 43. Magnetic slider; 44. Magnetic strip. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0029] Please see Figure 1-7 The present invention provides an embodiment of a screening structure for separating dredged soil particles, comprising a screening tank 1, a feed chute 2 at one end of the rear side of the screening tank 1, a fine soil discharge chute 3 at one end of the front side of the screening tank 1, a coarse soil discharge chute 4 at the middle position of one side of the screening tank 1, a first baffle 14 inside the screening tank 1, a second baffle 15 on one side of the upper end of the first baffle 14, a first discharge valve 10 sealed to one end of a second discharge pipe 7, and the first baffle 14 and the second baffle 15 fixedly connected by five fixing rods 27 evenly spaced. The first baffle 14 and the second baffle 15 are close to the fine soil discharge point. One end of the trough 3 is inclined toward the fine soil discharge trough 3. A first sorting trough 12 is provided on one side of the first baffle 14, and a second sorting trough 13 is provided on the other side of the first baffle 14. A third baffle 16 is fixedly provided on one side of the screening tank 1. A first scraping mechanism 17 is provided on one side of the third baffle 16. Screws 35 are provided on the two opposite inner walls of the screening tank 1. A second scraping mechanism 18 is provided on one side of the screening tank 1 near the feed trough 2. A third scraping mechanism 19 is provided on one side of the screening tank 1 near the fine soil discharge trough 3. One end of the second scraping mechanism 18 and the third scraping mechanism 19 is slidably connected to one side of the first baffle 14.

[0030] In use, the first baffle 14 and the second baffle 15 work together to separate coarse particles from fine particles and suspended impurities. The second baffle 15 causes fine particles to generate a vortex near the fine soil discharge trough 3. Due to the effect of the vortex, fine soil and some suspended impurities are attracted and flow into the fine soil discharge trough, thus achieving screening. This ensures controllable and effective sorting. The structure is simple and generates less noise and vibration during use, providing a better working environment. The first scraping mechanism 17, the second scraping mechanism 18, and the third scraping mechanism 19 can scrape off the dredged soil particles that have settled inside the first sorting tank 12 and the second sorting tank 13, respectively. Reducing the amount of dredged soil particles settled inside the screening tank can effectively improve the effect of subsequent sorting operations.

[0031] Please see Figure 1 and Figure 4 A feed pipe 5 is sealed to one side of the feed trough 2, a first discharge pipe 6 is sealed to one side of the fine soil discharge trough 3, a second discharge pipe 7 is sealed to one side of the coarse soil discharge trough 4, a three-way valve 8 is sealed to one end of the feed pipe 5, a first discharge pipe 9 is sealed to the other side of the three-way valve 8, and a second discharge valve 11 is sealed to one end of the first discharge pipe 6.

[0032] Please see Figure 1 , Figure 5-7 The lower end of the other side of the first baffle 14 is provided with a sliding groove 42, and a magnetic slider 43 is slidably arranged inside the sliding groove 42. The first scraping mechanism 17 includes a scraping frame 28, a scraping plate 29, a scraping plate groove 30, a particle guiding groove 31, a drive rod sleeve 32, a drive rod 33, a scraping mechanism drive motor 34, a sliding block 36, a rotating seat 37, a particle guiding groove baffle 38, a particle guiding groove 39, and a magnetic strip 44. The second scraping mechanism 18 and the third scraping mechanism 19 both include a scraping frame 28, a scraping plate 29, a scraping plate groove 30, a particle guiding groove 31, a drive rod sleeve 32, and a sliding block 36. Their assembly method is the same as that of the first scraping mechanism 17.

[0033] Please see Figure 1-4The scraper plate 29 is located on one side of the scraper frame 28. A scraper plate groove 30 is provided inside the scraper frame 28. One end of the scraper plate 29 extends into the interior of the scraper plate groove 30, and the scraper plate 29 is slidably connected to the scraper plate groove 30. Two electric telescopic cylinders 41 for scraping mechanism are symmetrically arranged vertically inside the scraper plate groove 30. Preferably, the electric telescopic cylinder 41 for scraping mechanism is a multi-stage electric telescopic rod. One end of the electric telescopic cylinder 41 for scraping mechanism is fixedly connected to the inner wall of the scraper plate groove 30, and the other end is fixedly connected to the scraper plate 29. The drive rod sleeve 32 is located on the other side of the scraping frame 28. A drive rod 33 is installed inside the drive rod sleeve 32 of the first scraping mechanism 17, with its upper and lower ends extending to the outside of the drive rod sleeve 32. A scraping mechanism drive motor 34 is installed below the drive rod sleeve 32 of the first scraping mechanism 17, and the output end of the scraping mechanism drive motor 34 is connected to the drive rod 33 via a key. A sliding block 36 is installed on the outer transmission sleeve of the lead screw 35. The sliding block 36 of the first scraping mechanism 17 is connected to... The drive rod sleeve 32 is rotatably connected to the rotating seat 37, and the scraping mechanism drive motor 34 is fixedly connected to the lower end of the rotating seat 37. The drive rod sleeves 32 of the second scraping mechanism 18 and the third scraping mechanism 19 are fixedly connected to the sliding block 36. One end of the scraping plate 29 of the first scraping mechanism 17 is provided with a magnetic strip 44, and the magnetic strip 44 is magnetically connected to the magnetic slider 43. The scraping plate 29 of the second scraping mechanism 18 and the third scraping mechanism 19 is slidably connected to one side of the first baffle 14.

[0034] Please see Figure 2-3 The third baffle 16 is a multi-section telescopic structure. Specifically, the upper and lower ends of the third baffle 16 are respectively provided with first stop sleeves 20. A third baffle fixing hook 40 is fixedly provided on one side above the first stop sleeve 20, and the lower end of the third baffle fixing hook 40 extends into the interior of the first stop sleeve 20. A baffle electric telescopic cylinder 23 is fixedly installed below the third baffle fixing hook 40. Two first stop sleeves 22 are provided between the two first stop sleeves 20. A shrink block 21 is provided between the first stop sleeve 22 and the first stop sleeve 20, as well as between the two first stop sleeves 22. The interiors of the first stop sleeve 20, the shrink block 21, and the first stop sleeve 22 are all... One side of each is provided with an electric telescopic cylinder groove 24, and the baffle electric telescopic cylinder 23 is located inside the electric telescopic cylinder groove 24. The lower end of the baffle electric telescopic cylinder 23 is fixedly connected to the inner wall of the electric telescopic cylinder groove 24 of the lower first baffle sleeve 20. The interior of the first baffle sleeve 20 is provided with a second shrinkage block groove 26. The upper and lower ends of the first baffle sleeve 22 are symmetrically provided with first shrinkage block grooves 25. The upper end of the upper shrinkage block 21 is slidably connected to the second shrinkage block groove 26, and the lower end of the lower shrinkage block 21 is slidably connected to the second shrinkage block groove 26. The shrinkage block 21 is slidably connected to the first shrinkage block groove 25.

[0035] Please see Figure 5-7The scraper frame 28 and the guide groove 31 have a grain-guiding groove 39 inside the front end and a guide groove 31 inside the rear end. The grain-guiding groove 39 and the guide groove 31 are connected. The rear ends of the scraper frame 28 and the guide groove 31 are rotatably connected to a guide groove baffle 38. The height of the grain-guiding groove 39 gradually decreases from the end away from the guide groove 31 to the other end.

[0036] Please see Figure 1 and Figure 4 The upper part of the second baffle 15 is higher than the first baffle 14, and the lower part of the second baffle 15 is lower than the first baffle 14.

[0037] A screening method for a screening structure used for separating dredged soil particles includes the following steps:

[0038] Step 1: Fix the screening structure in place, open the inflow three-way valve 8, the first discharge valve 10 and the second discharge valve 11, and inject water into the screening tank 1 through the feed pipe 5 according to the volume of dredged soil to be processed until the water level in the first sorting tank 12 is above the height of the first baffle 14. At the same time, the total amount of water injected should ensure that the dredged soil slurry has a slurry moisture content of 400% to 800%. Then, the dredged soil to be processed flows into the first sorting tank 12 at a uniform speed through the feed pipe 5 and the feed tank 2.

[0039] Step 2: In the first sorting tank 12, due to the different particle sizes of the dredged soil particles, there will be obvious particle stratification, causing fine particles and suspended impurities to float on the upper part, while coarse particles are mainly concentrated at the bottom. During the flow of dredged soil particles, some coarse particles will flow out from the gap between the first baffle 14 and the second baffle 15 with the action of water flow. Due to the obstruction of the second baffle 15, most of the fine soil particles and suspended impurities are at the upper part. Due to the placement of the third baffle 16, a vortex will be formed near the fine soil discharge tank 3. Due to the action of the vortex, fine soil particles and some suspended impurities are attracted and flow into the fine soil discharge tank 3, thus achieving screening.

[0040] Working principle: After screening, some dredged soil particles will settle inside the screening tank 1. At this time, the first scraping mechanism 17 scrapes away the dredged soil particles inside the first sorting tank 12. First, the three shrinking blocks 21 are sequentially retracted into the first shrinking block groove 25 and the second shrinking block groove 26 by the electric telescopic cylinder 23 of the shrinking baffle. At this time, the bottom end of the third baffle 16 is separated from the bottom of the screening tank 1, and the lower end of the third baffle 16 is higher than the height of the first scraping mechanism 17. The scraping mechanism drive motor 34 drives the scraping frame 28 and scraping plate 29 to rotate until they are parallel to the third baffle 16. At this time, the electric telescopic cylinder 41 of the scraping mechanism extends the scraping plate 29 out of the scraping plate groove 30. At this time, the magnetic slider 43 and the magnetic strip 44 attract each other due to magnetic force. The particle inlet groove 39 of the first scraping mechanism 17 is located on the side close to the fine soil discharge trough 3. The first scraping mechanism 17 is moved towards the fine soil discharge trough 3 by the drive of the screw 35 on one side of the first scraping mechanism 17. The cooperation of the 9 and the guide trough 31 allows the dredged soil particles from the side of the first scraping mechanism 17 near the fine soil discharge trough 3 to be transported to the other side of the first scraping mechanism 17. The first scraping mechanism 17 is then driven to move towards the feed trough 2 via the reversing screw 35, pushing the dredged soil particles towards the feed trough 2. At this time, the three-way valve 8 is adjusted to connect the feed pipe 5 with the first discharge pipe 9, allowing the dredged soil particles in the first sorting trough 12 to be output through the first discharge pipe 9, and then through the second scraping mechanism 18 and the third scraping mechanism 19. The lead screw 35 drives the second scraping mechanism 18 and the third scraping mechanism 19 to move towards the coarse soil discharge trough 4. The guide trough baffles 38 of the second scraping mechanism 18 and the third scraping mechanism 19 are both oriented towards the coarse soil discharge trough 4. At the same time, the scraping plates 29 of the second scraping mechanism 18 and the third scraping mechanism 19 are slidably connected to the first baffle 14. By moving the scraping plates 29, they can slide inside the scraping plate groove 30 and output the dredged soil particles in the second sorting trough 13 through the second discharge pipe 7.

[0041] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A screening structure for separating dredged soil particles, comprising a screening tank (1), characterized in that: A feed chute (2) is provided at one end of the rear side of the screening tank (1), a fine soil discharge chute (3) is provided at one end of the front side of the screening tank (1), a coarse soil discharge chute (4) is provided at the middle position of one side of the screening tank (1), a first baffle (14) is provided inside the screening tank (1), a second baffle (15) is provided on one side of the upper end of the first baffle (14), a first sorting chute (12) is provided on one side of the first baffle (14), and a second sorting chute (13) is provided on the other side of the first baffle (14), a third baffle (16) is fixedly provided on one side of the interior of the screening tank (1), a first scraping mechanism (17) is provided on one side of the third baffle (16), and the two opposite sides of the screening tank (1) A screw rod (35) is provided on the inner wall. A second scraping mechanism (18) is provided on one side of the screening tank (1) near the feed trough (2). A third scraping mechanism (19) is provided on one side of the screening tank (1) near the fine soil discharge trough (3). One end of the second scraping mechanism (18) and the third scraping mechanism (19) is slidably connected to one side of the first baffle (14). A feed pipe (5) is sealed to one side of the feed trough (2). A three-way valve (8) is sealed to one end of the feed pipe (5). A first discharge pipe (9) is sealed to the other side of the three-way valve (8). The first baffle (14) and the second baffle (15) are fixedly connected by a fixing rod (27). The first scraping mechanism (18) is slidably connected to one side of the feed trough (2). The pelletizing mechanism (17) includes a scraping frame (28), a scraping plate (29), a scraping plate groove (30), a guiding groove (31), a drive rod sleeve (32), a drive rod (33), a scraping mechanism drive motor (34), a sliding block (36), a rotating seat (37), a guiding groove baffle (38), a pellet guiding groove (39), and a magnetic strip (44). The scraping plate (29) is located on one side of the scraping frame (28). The scraping frame (28) has a scraping plate groove (30) inside. One end of the scraping plate (29) extends into the scraping plate groove (30), and the scraping plate (29) is slidably connected to the scraping plate groove (30). Two electric telescopic cylinders (41) of the scraping mechanism are symmetrically arranged inside the scraping plate groove (30). One end of the electric telescopic cylinder (41) of the scraping mechanism is fixedly connected to the inner wall of the scraping plate groove (30), and the other end of the electric telescopic cylinder (41) of the scraping mechanism is fixedly connected to the scraping plate (29). The drive rod sleeve (32) is located on the other side of the scraping frame (28). The drive rod sleeve (32) of the first scraping mechanism (17) is provided with a drive rod (33), and the upper and lower ends of the drive rod (33) extend to the outside of the drive rod sleeve (32). The drive motor (34) of the scraping mechanism is provided below the drive rod sleeve (32) of the first scraping mechanism (17), and the output end of the drive motor (34) of the scraping mechanism is connected to the drive rod (33) by a key. The outer transmission sleeve of the lead screw (35) is fitted with a sliding block (36).The sliding block (36) of the first scraping mechanism (17) is rotatably connected to the drive rod sleeve (32) through the rotating seat (37), and the scraping mechanism drive motor (34) is fixedly connected to the lower end of the rotating seat (37). The drive rod sleeve (32) of the second scraping mechanism (18) and the third scraping mechanism (19) is fixedly connected to the sliding block (36). The upper and lower ends of the third baffle (16) are respectively provided with the first baffle sleeve (20). A third baffle fixing hook (40) is fixedly provided on one side above the first baffle sleeve (20). The lower end of the fixing hook (40) extends into the interior of the first stop sleeve (20). A baffle electric telescopic cylinder (23) is fixedly installed below the third baffle fixing hook (40). Two first stop sleeves (22) are provided between the two first stop sleeves (20). A shrink block (21) is provided between the first stop sleeve (22) and the first stop sleeve (20) and between the two first stop sleeves (22). An electric telescopic cylinder groove (24) is provided on one side inside the first stop sleeve (20), the shrink block (21), and the first stop sleeve (22). The electric telescopic cylinder (23) is located inside the electric telescopic cylinder groove (24). The lower end of the baffle electric telescopic cylinder (23) is fixedly connected to the inner wall of the electric telescopic cylinder groove (24) of the lower first baffle sleeve (20). The first baffle sleeve (20) is provided with a second shrinkage block groove (26). The upper and lower ends of the first baffle sleeve (22) are symmetrically provided with first shrinkage block grooves (25). The upper end of the upper shrinkage block (21) is slidably connected to the second shrinkage block groove (26), and the lower end of the lower shrinkage block (21) is connected to the second shrinkage block groove (26). The shrinkage block (21) is slidably connected to the first shrinkage block groove (25). A particle-guiding groove (39) is provided inside the front end of the scraping frame (28) and the guiding groove (31). A guiding groove (31) is provided inside the rear end of the scraping frame (28) and the guiding groove (31), and the particle-guiding groove (39) communicates with the guiding groove (31). A guiding groove baffle (38) is rotatably connected to the rear end of both the scraping frame (28) and the guiding groove (31). The height of the particle-guiding groove (39) gradually decreases from the end furthest from the guiding groove (31) to the other end.

2. The screening structure for dredged soil particle sorting according to claim 1, characterized in that: The fine soil discharge trough (3) is sealed to one side with a first discharge pipe (6), the coarse soil discharge trough (4) is sealed to one side with a second discharge pipe (7), one end of the first discharge pipe (6) is sealed to a second discharge valve (11), and one end of the second discharge pipe (7) is sealed to a first discharge valve (10).

3. A screening structure for separating dredged soil particles according to claim 2, characterized in that: The fixed rods (27) are arranged in five equidistant positions. The first baffle (14) and the second baffle (15) are inclined towards the fine soil discharge chute (3) at the end closest to the fine soil discharge chute (3).

4. A screening structure for separating dredged soil particles according to claim 3, characterized in that: A groove (42) is provided at the lower end of the other side of the first baffle (14). A magnetic slider (43) is slidably provided inside the groove (42). The second scraping mechanism (18) and the third scraping mechanism (19) both include a scraping frame (28), a scraping plate (29), a scraping plate groove (30), a guide groove (31), a drive rod sleeve (32), and a sliding block (36).

5. A screening structure for separating dredged soil particles according to claim 4, characterized in that: The scraper plate (29) of the first scraper mechanism (17) is provided with a magnetic strip (44) at one end, and the magnetic strip (44) is magnetically connected to the magnetic slider (43). The scraper plates (29) of the second scraper mechanism (18) and the third scraper mechanism (19) are slidably connected to one side of the first baffle (14).

6. A screening structure for separating dredged soil particles according to claim 5, characterized in that: The upper end of the second baffle (15) is higher than the first baffle (14), and the lower end of the second baffle (15) is lower than the first baffle (14).

7. A screening method based on the screening structure for dredged soil particle sorting as described in claim 6, characterized in that, Includes the following steps: Step 1: Fix the screening structure, open the inflow three-way valve (8), the first discharge valve (10) and the second discharge valve (11), and inject water into the screening tank (1) through the feed pipe (5) according to the volume of dredged soil to be processed until the water level of the first sorting tank (12) overflows the height of the first baffle (14). At the same time, the total amount of water injected should ensure that the dredged soil slurry has a slurry moisture content of 400% to 800%. Then, the dredged soil to be processed flows into the first sorting tank (12) at a uniform speed through the feed pipe (5) and the feed tank (2). Step 2: In the first sorting tank (12), due to the different particle sizes of the dredged soil particles, the dredged soil particles will undergo obvious particle stratification, causing fine particles and suspended impurities to float on the upper part, while coarse particles are mainly concentrated in the lower part. During the flow of dredged soil particles, some coarse particles will flow out from the gap between the first baffle (14) and the second baffle (15) with the action of water flow. Due to the obstruction of the second baffle (15), most of the fine soil particles and suspended impurities are in the upper part. Due to the placement of the third baffle (16), a vortex will be formed near the fine soil discharge tank (3). Due to the action of the vortex, fine soil particles and some suspended impurities are attracted and flow into the fine soil discharge tank (3) to achieve screening.

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