An underwater dredging device for excavating a hard soil layer of sediment deposition

Abstract

This application relates to the field of dredging equipment technology and discloses a dredger cutter head device for dredging underwater sediment-laden hard soil layers. The device includes a linkage sleeve, with a cutter head fixedly mounted at one end of the linkage sleeve. A mud inlet pipe is also mounted on the cutter head, located below the linkage sleeve. Four cutter motors are installed inside the linkage sleeve to drive the cutter head rotation. A gear transmission mechanism is also fixedly installed inside the linkage sleeve. This design with four cutter motors significantly increases the total driving power of the cutter head compared to existing equipment with only one motor, thereby improving cutting efficiency and effectively reducing and preventing phenomena such as "cutter rolling," "cutter running," and "cutter slippage" during the cutting process, achieving effective cutting capability for slab sand.

Description

Technical Field

[0001] This application relates to the field of dredging equipment technology, and in particular to a dredging cutter head device for dredging underwater sedimentary hard soil layers. Background Technology

[0002] Currently, conventional cutter suction dredgers are the most widely used type of dredger in dredging projects. They are suitable for dredging projects in ports, rivers, and lakes, and are applicable to soil types such as sand, sandy clay, gravel, and cohesive soil. They are generally equipped with single or double cutter motors. However, for special soil types such as hard soil layers, their dredging capacity, dredging efficiency, wear resistance, and durability have always been bottleneck problems in dredging work.

[0003] Along the Yellow River's old course water ecological restoration project, underwater dredging depths contain hard soil layers ranging from 30 to 100 cm in thickness. This hard soil layer is a special type of sedimentary deposit, composed of dense silty fine sand and sandy silt, mainly containing quartz sand and clay. It is a sedimentary layer that is as hard as an "iron plate," making dredging very difficult. When using conventional cutter suction dredgers for dredging operations, the high hardness and wear resistance of the "iron plate sand" make the cutter head prone to "rolling," "running," and "slipping" phenomena during lateral movement. This reduces the cutter head's rotation speed and lateral movement speed, and decreases the forward movement distance, resulting in significant difficulties in dredging and construction using conventional cutter suction dredgers. This makes excavation and crushing operations very difficult, leading to low construction efficiency, rapid wear of the dredger's cutter head, frequent maintenance, low dredging efficiency, high construction costs, and slow construction progress.

[0004] To address the industry challenge of dredging efficiency in hard soil layers, a new dredging cutter head structure for underwater sediment deposition in hard soil layers (iron plate sand) was developed, targeting the key component of the cutter suction dredger used on site. Summary of the Invention

[0005] This application proposes a dredger cutter device for dredging underwater sedimentary hard soil layers, which has the advantages of high cutting efficiency and high stability, and is used to solve the problems of "cutter rolling", "cutter running" and "cutter slipping" that are easy to occur when existing dredging equipment deals with underwater sedimentary hard soil layers.

[0006] To achieve the above objectives, this application adopts the following technical solution: a dredger cutter device for dredging underwater sedimentary hard soil layers, comprising a linkage sleeve, a cutter seat fixedly installed at one end of the linkage sleeve, a cutter head movably installed on the cutter seat, a mud inlet pipe located below the linkage sleeve installed on the cutter seat, a cutter motor for driving the cutter head to rotate inside the linkage sleeve, the number of cutter motors being four, and the output shaft of each cutter motor being fixedly connected to one end of a shaft transmission mechanism, and a gear transmission mechanism being fixedly installed inside the linkage sleeve.

[0007] The gear transmission mechanism includes four input shafts, which are fixedly connected to the other end of four shaft transmission mechanisms, and also includes an output shaft, one end of which is fixedly connected to a reamer head.

[0008] Furthermore, a positioning plate is fixedly installed inside the linkage sleeve, and four reamer motors are all fixedly installed on the positioning plate, with the four reamer motors arranged in a circumferential array on the positioning plate.

[0009] Furthermore, the gear transmission mechanism includes a gearbox fixedly installed inside the linkage sleeve. Cover plates are fixedly installed at both ends of the gearbox. Four input shafts are installed on two cover plates, and input gears are fixedly installed on each of the four input shafts. An output shaft is movably installed in the middle of the two cover plates, and an output gear located inside the gearbox is fixedly installed on the output shaft. The outer side of the output gear meshes with the outer side of the four input gears.

[0010] Furthermore, one end of the output shaft is movably sleeved with the positioning plate, and the connection between the output shaft and the positioning plate, the two cover plates and the reamer seat is connected by bearings.

[0011] Furthermore, the shaft transmission mechanism includes a positioning coupling fixedly connected to the output shaft of the reamer motor, and a limiting coupling fixedly connected to one end of the input shaft. A movable coupling is movably fitted onto one end of the positioning coupling. The movable coupling is T-shaped with a 90-degree rotation. One end of the movable coupling is movably connected to the end of the limiting coupling away from the input shaft.

[0012] Furthermore, both the positioning shaft and the moving shaft have protrusions on their outer sides, the moving shaft has a groove in the middle that matches the protrusion of the positioning shaft, and the limiting shaft has a slot that matches the protrusion on the outer side of the moving shaft.

[0013] Furthermore, a guide groove communicating with the card slot is provided on the side of the limiting coupling away from the input rotating shaft, and the width of the guide groove decreases uniformly from the outside to the inside.

[0014] Furthermore, a passive plate is movably mounted on the output shaft between the positioning plate and the cover plate. A first magnetic ring is fixedly installed on the side of the passive plate facing the positioning plate. A second magnetic ring is fixedly installed on the movable shaft facing the first magnetic ring, and the first and second magnetic rings are magnetically attracted to each other. A third magnetic ring is also fixedly installed on the movable shaft away from the first magnetic ring. An annular electromagnet located outside the positioning shaft is fixedly installed on the side of the positioning plate. When the annular electromagnet is energized, it is magnetically attracted to the third magnetic ring, and the magnetic attraction force of the annular electromagnet on the third magnetic ring is greater than the magnetic attraction force of the first magnetic ring on the second magnetic ring. A speed sensor for monitoring the rotation speed is also provided at the connection between the output shaft of the reamer motor and the positioning shaft.

[0015] Furthermore, a hydraulic cylinder is fixedly installed on the positioning plate. The number of hydraulic cylinders is set to two, and the two hydraulic cylinders are arranged symmetrically on the positioning plate. One end of the piston shaft of the hydraulic cylinder is fixedly connected to a linkage rod, and one end of the linkage rod is fixedly connected to the passive plate.

[0016] Furthermore, the side of the reamer holder away from the linkage sleeve is designed with a conical surface, and a mud inlet groove is opened at the bottom of the reamer holder.

[0017] The beneficial effects of this invention are as follows:

[0018] 1. The dredger cutter device for dredging underwater sedimentary hard soil layers provided in this application, through the design of four cutter motors, significantly increases the total driving power of the cutter head compared to the existing equipment with a single cutter motor, thereby improving cutting efficiency and effectively reducing and preventing the phenomena of "rolling cutter", "running cutter", and "slipping cutter" during the cutting process, and realizing effective cutting capability for slab sand.

[0019] 2. The dredger cutter device for dredging underwater sedimentary hard soil layers provided in this application, through the structural arrangement of four cutter motors, combined with the weight of the shaft transmission mechanism and gear transmission mechanism, further improves the cutting stability of the cutter, thereby helping to reduce the phenomena of "rolling cutter", "running cutter" and "slipping cutter" that occur during the cutting process, and achieving high cutting efficiency for slab sand.

[0020] 3. The output shafts of the four reamer motors are connected to the reamer head via shaft and gear transmission mechanisms. Combined with the hydraulic cylinder-driven piston shaft movement and speed sensor monitoring, this system allows the faulty reamer motor to disconnect from the gear transmission mechanism in the event of a malfunction, preventing disruption to the normal operation of the other reamer motors. This avoids further damage to the faulty motor, increased load on the other working reamer motors, and wear on the transmission gears. It effectively prevents the faulty motor from affecting the subsequent output power and lifespan of the working reamer motors. Compared to monitoring individual reamer motors by voltage and current, this system avoids malfunctions caused by internal mechanical mechanisms that typically do not affect the circuit's current and voltage, making it difficult to quickly identify the faulty motor. Therefore, using four reamer motors improves output efficiency while effectively protecting the others in the event of a fault, without affecting the subsequent cutting operations of the reamer head on underwater sediment and hard soil layers. Attached Figure Description

[0021] 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 embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort:

[0022] Figure 1 This is a schematic diagram of the overall structure of the dredger in this application;

[0023] Figure 2 for Figure 1 Schematic diagram of the connection structure between the central linkage sleeve and the reamer head;

[0024] Figure 3 for Figure 2 A cross-sectional view of the central linkage sleeve;

[0025] Figure 4 for Figure 3 A schematic diagram of the complete connection structure between the four reamer motors and the gear transmission mechanism;

[0026] Figure 5 for Figure 4 The left view;

[0027] Figure 6 for Figure 3 A schematic diagram of the connection structure between one of the reamer motors and the input shaft;

[0028] Figure 7 for Figure 6Schematic diagram of the central shaft transmission mechanism;

[0029] Figure 8 for Figure 6 The front view;

[0030] Figure 9 for Figure 6 An explosion diagram;

[0031] Figure 10 for Figure 9 Schematic diagram of the moving coupling structure;

[0032] Figure 11 for Figure 9 A schematic diagram of the middle limit coupling.

[0033] In the diagram: 1. Dredger; 2. Cutterhead frame; 3. Linkage sleeve; 4. Cutterhead seat; 401. Inlet trough; 5. Cutterhead head; 6. Inlet pipe; 7. Suction pipe; 8. Positioning plate; 9. Cutterhead motor; 10. Shaft drive mechanism; 101. Positioning coupling; 102. Limiting coupling; 1021. Slot; 1022. Guide slot; 103. Moving coupling; 11. Gearbox; 12. Cover plate; 13. Input shaft; 14. Input gear; 15. Output shaft; 16. Output gear; 17. Passive plate; 18. First magnetic ring; 19. Second magnetic ring; 20. Third magnetic ring; 21. Ring electromagnet; 22. Hydraulic cylinder; 23. Linkage rod. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Examples, such as Figures 1-3A dredger cutterhead device for dredging underwater sediment deposits in hard soil layers includes a dredger 1. A cutterhead frame 2 is movably mounted on one end of the dredger 1. A linkage sleeve 3 is fixedly mounted on the end of the cutterhead frame 2 away from the dredger 1. A cutterhead seat 4 is fixedly mounted on the end of the linkage sleeve 3 away from the cutterhead frame 2. A cutterhead 5 is movably mounted on the cutterhead seat 4, and the cutterhead 5 is connected to the cutterhead seat 4 via a bearing, allowing the cutterhead 5 to rotate relative to the cutterhead seat 4. The side of the cutterhead seat 4 away from the linkage sleeve 3 has a conical design, and the bottom of the cutterhead seat 4 has an opening. There is a mud inlet trough 401, which facilitates the guidance of the mud fragments cut by the cutter head 5 into the mud inlet trough 401. The cutter seat 4 is fixedly installed with a mud inlet pipe 6 that connects to the mud inlet trough 401. The mud inlet pipe 6 is located below the linkage sleeve 3. The end of the mud inlet pipe 6 away from the cutter seat 4 is connected to a suction pipe 7. The end of the suction pipe 7 away from the mud inlet pipe 6 is connected to a mud pump (not shown in the figure) installed on the dredger 1. By driving the cutter seat 4 to rotate, the dredger can operate on the hard soil layer of underwater sediment deposition, and the mud pump can pump the broken soil layer and water together onto the dredger 1.

[0036] Please see Figures 2-5 A positioning plate 8 is fixedly installed inside the linkage sleeve 3. A reamer motor 9, which drives the reamer head 5 to rotate, is fixedly installed on the side of the positioning plate 8. There are four reamer motors 9, which are arranged in a circular array on the positioning plate 8. The output shaft of the reamer motor 9 is fixedly connected to a shaft transmission mechanism 10. A gear transmission mechanism located on one side of the shaft transmission mechanism 10 is also fixedly installed inside the linkage sleeve 3. The gear transmission mechanism includes a gearbox 11 fixedly installed inside the linkage sleeve 3. Cover plates 12 are fixedly installed at both ends of the gearbox 11. Four input shafts 13 are movably installed on the two cover plates 12, and the four input shafts 13 are fixedly connected to one end of the four shaft transmission mechanisms 10. Input gears 14 are fixedly installed on the four cover plates 12. An output shaft 15 is movably installed in the middle between the two cover plates 12. One end of the output shaft 15 is movably sleeved with the positioning plate 8, and the other end of the output shaft 15 passes through the reamer seat 4 and is fixedly connected to the middle of the reamer head 5. The connection between the output shaft 15 and the positioning plate 8, the two cover plates 12 and the reamer seat 4 is connected by bearings. An output gear 16 located inside the gearbox 11 is fixedly installed on the output shaft 15, and the outer side of the output gear 16 meshes with the outer side of the four input gears 14. The four reamer motors 9 simultaneously drive the shaft transmission mechanism 10 to drive the input shaft 13 in the gear transmission mechanism to rotate. Then, by utilizing the meshing action of the input gears 14 and the output shaft 15, the output shaft 15 and the reamer head 5 are driven to rotate to perform dredging operations on the hard soil layer of underwater sediment deposition.

[0037] By designing four reamer motors 9, each with a power of 150KW, the total power reaches 600KW. This increases the total power driving the reamer head 5 by 3.5-4.6 times compared to existing equipment with a single reamer motor 9, significantly improving the total driving power of the reamer head 5 and thus enhancing cutting efficiency. It effectively reduces and prevents phenomena such as "rolling," "running," and "slipping" during cutting, achieving effective cutting capability for iron plate sand. Furthermore, the structure of the four reamer motors 9, combined with the weight of the shaft transmission mechanism 10 and gear transmission mechanism, improves the cutting stability of the reamer, further reducing "rolling," "running," and "slipping" phenomena and achieving high cutting efficiency for iron plate sand.

[0038] Please see Figures 3-4 , Figures 6-11 The shaft transmission mechanism 10 includes a positioning coupling 101 fixedly connected to the output shaft of the reamer motor 9, and a limiting coupling 102 fixedly connected to one end of the input shaft 13. A movable coupling 103 is movably fitted onto one end of the positioning coupling 101. The movable coupling 103 is T-shaped with a 90-degree rotation. The positioning coupling 101 has protrusions on its upper and lower sides, such as... Figure 11 As shown, the movable coupling 103 has a groove in the middle that matches the protrusion of the positioning coupling 101, so that the movable coupling 103 can move on the positioning coupling 101 while the positioning coupling 101 can drive the movable coupling 103 to rotate. One end of the movable coupling 103 is movably connected to the end of the limiting coupling 102 away from the input rotating shaft 13. The outer side of the movable coupling 103 has a protrusion, such as... Figure 11As shown, the limiting coupling 102 has a slot 1021 that matches the protrusion on the outer side of the moving coupling 103. A guide groove 1022 communicating with the slot 1021 is also provided on the side of the limiting coupling 102 away from the input shaft 13. The width of the guide groove 1022 decreases uniformly from the outside to the inside. The protrusion on the moving coupling 103 allows the moving coupling 103 to both rotate the limiting coupling 102 and move to a state where the limiting coupling 102 is completely separated. Furthermore, the uniformly decreasing width of the guide groove 102 facilitates the movement of the protrusion on the moving coupling 103 into the slot 1021, allowing the moving coupling 103 to move from the limiting coupling 103 to a state where it is completely separated from the limiting coupling 103. When shaft 102 is separated, it moves to a state where it is engaged with the limiting coupling 102, thereby driving the limiting coupling 102 to rotate. That is, when the moving coupling 103 is engaged with the limiting coupling 102, the output shaft driven by the reamer motor 9 drives the positioning coupling 101 to rotate. The positioning coupling 101 drives the moving coupling 103 to rotate, which in turn drives the limiting coupling 102, the input shaft 13, and the input gear 14 to rotate. The input gear 14 drives the output gear 16 to rotate, which in turn drives the output shaft 15 and the reamer head 5 to rotate. Thus, the rotating reamer head 5 cuts and breaks up the hard soil layer of underwater sediment deposits so that it can be pumped out by a suction pump.

[0039] Please see Figures 3-4 , Figures 6-7 A passive plate 17 is movably mounted on the output shaft 15, located between the positioning plate 8 and the cover plate 12. A first magnetic ring 18 is fixedly mounted on the side of the passive plate 17 facing the positioning plate 8. A second magnetic ring 19 is fixedly mounted on the moving shaft 103, facing the first magnetic ring 18. The first magnetic ring 18 and the second magnetic ring 19 are magnetically attracted to each other. A third magnetic ring 20 is also fixedly mounted on the moving shaft 103, on the side away from the first magnetic ring 18. A ring electromagnet 21 is fixedly mounted on the side of the positioning plate 8, located outside the positioning shaft 101. When the ring electromagnet 21 is energized, it is magnetically attracted to the third magnetic ring 20. The magnetic attraction of the ring electromagnet 21 to the third magnetic ring 20 when energized is greater than the magnetic attraction of the first magnetic ring 18 to the second magnetic ring 19.

[0040] Please see Figures 4-5 A hydraulic cylinder 22 is fixedly installed on the positioning plate 8. The number of hydraulic cylinders 22 is set to two, and the two hydraulic cylinders 22 are arranged symmetrically on the positioning plate 8. One end of the piston shaft of the hydraulic cylinder 22 is fixedly connected to a linkage rod 23, and one end of the linkage rod 23 is fixedly connected to the passive plate 17.

[0041] Each reamer motor 9 has a speed sensor (not shown in the figure) installed at the connection between its output shaft and the positioning coupling 101. This sensor monitors the output speed of the reamer motor 9. When one motor fails, causing a reduction in total output power, the hydraulic cylinder 22 drives the piston shaft to move the passive plate 17 towards the positioning plate 8. This causes the passive plate 17 to move the moving coupling 103 away from the limit coupling 102. At this time, the output shaft of the normal reamer motor 9 maintains its normal idle speed. When the output shaft of the faulty motor slows down or stops rotating, the speed sensor detects this and energizes the annular electromagnet 21 located outside the connection between the output shaft of the reamer motor 9 and the positioning coupling 101. This generates a magnetic attraction force on the third magnetic ring 20. The hydraulic cylinder 22 then drives the piston shaft to move the passive plate 17 away from the positioning plate 8. The magnetic attraction force of the annular electromagnet 21 on the third magnetic ring 20 overcomes the magnetic attraction force of the first magnetic ring 18 on the second magnetic ring 19, thus keeping the moving coupling 103 connected to the faulty reamer motor 9 in place. The movable coupling 103, which is connected to the transmission of the other normal reamer motors 9, moves with the first magnetic ring 18 and the passive plate 17 until one end of the movable coupling 103 moves into the limit coupling 102, which then drives the limit coupling 102, the input shaft 13, and the input gear 14 to rotate again. This avoids further damage to the faulty reamer motor 9, as well as increasing the load on the other normal reamer motors 9 and the wear of the transmission gears. It effectively prevents the faulty reamer motor 9 from affecting the subsequent output power and service life of the normal reamer motors 9. Compared with monitoring each reamer motor 9 separately by voltage and current, this avoids faults caused by the internal mechanical mechanism of the reamer motor 9, which would prevent the reamer motor 9 from operating normally. Such faults usually do not affect the current and voltage of the circuit, making it difficult to quickly identify the faulty motor. Thus, setting up four reamer motors 9 improves output efficiency and effectively protects the other motors when one motor fails, without affecting the subsequent cutting operation of the reamer head 5 on the hard soil layer of underwater mud and sand.

[0042] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A dredging cutterhead device for underwater dredging of hard soil layers with sediment deposition, characterized in that, The system includes a linkage sleeve (3), one end of which is fixedly mounted with a reamer seat (4), and a reamer head (5) is movably mounted on the reamer seat (4). A mud inlet pipe (6) located below the linkage sleeve (3) is also mounted on the reamer seat (4). The linkage sleeve (3) is equipped with a reamer motor (9) that drives the reamer head (5) to rotate. The number of reamer motors (9) is set to four, and the output shaft of each reamer motor (9) is fixedly connected to one end of the shaft transmission mechanism (10). A gear transmission mechanism is also fixedly mounted inside the linkage sleeve (3). The gear transmission mechanism includes four input shafts (13), which are fixedly connected to the other end of four shaft transmission mechanisms (10), and also includes an output shaft (15), one end of which is fixedly connected to the reamer head (5). The linkage sleeve (3) is fixedly installed with a positioning plate (8), and four reamer motors (9) are fixedly installed on the positioning plate (8), and the four reamer motors (9) are arranged in a circumferential array on the positioning plate (8). The gear transmission mechanism includes a gearbox (11) fixedly installed inside the linkage sleeve (3). Cover plates (12) are fixedly installed at both ends of the gearbox (11). Four input shafts (13) are installed on the two cover plates (12), and input gears (14) are fixedly installed on the four input shafts (13). An output shaft (15) is movably installed in the middle of the two cover plates (12), and an output gear (16) located inside the gearbox (11) is fixedly installed on the output shaft (15). The outer side of the output gear (16) meshes with the outer side of the four input gears (14). The shaft transmission mechanism (10) includes a positioning coupling (101) fixedly connected to the output shaft of the reamer motor (9), and a limiting coupling (102) fixedly connected to one end of the input shaft (13). A movable coupling (103) is movably fitted at one end of the positioning coupling (101). The movable coupling (103) is T-shaped with a 90-degree rotation. One end of the movable coupling (103) is movably fitted with the end of the limiting coupling (102) away from the input shaft (13).

2. The dredging cutter head device for underwater silt deposition in hard soil layers according to claim 1, characterized in that, One end of the output shaft (15) is movably sleeved with the positioning plate (8), and the connection between the output shaft (15) and the positioning plate (8), the two cover plates (12) and the reamer seat (4) is connected by bearings.

3. The dredging cutter head device for underwater silt deposition in hard soil layers according to claim 1, characterized in that, The outer sides of the positioning shaft (101) and the moving shaft (103) are provided with protrusions. The middle part of the moving shaft (103) is provided with a groove that matches the protrusion of the positioning shaft (101). The limiting shaft (102) is provided with a slot (1021) that matches the outer protrusion of the moving shaft (103).

4. The dredging cutter head device for underwater silt deposition in hard soil layers according to claim 3, characterized in that, The limiting coupling (102) has a guide groove (1022) on the side away from the input rotating shaft (13) that communicates with the slot (1021). The width of the guide groove (1022) decreases uniformly from the outside to the inside.

5. The dredging cutter head device for underwater silt deposition in hard soil layers according to claim 3, characterized in that, A passive plate (17) is movably mounted on the output shaft (15) between the positioning plate (8) and the cover plate (12). A first magnetic ring (18) is fixedly mounted on the side of the passive plate (17) facing the positioning plate (8). A second magnetic ring (19) is fixedly mounted on the movable shaft (103) facing the first magnetic ring (18), and the first magnetic ring (18) and the second magnetic ring (19) are magnetically attracted to each other. A third magnetic ring is also fixedly mounted on the movable shaft (103) on the side away from the first magnetic ring (18). A magnetic ring (20) is fixedly installed on the side of the positioning plate (8) and a ring electromagnet (21) located outside the positioning coupling (101). When the ring electromagnet (21) is energized, it is magnetically attracted to the third magnetic ring (20). When the ring electromagnet (21) is energized, the magnetic attraction force of the ring electromagnet (21) to the third magnetic ring (20) is greater than the magnetic attraction force of the first magnetic ring (18) to the second magnetic ring (19). A speed sensor for monitoring the rotation speed is also provided at the connection between the output shaft of the reamer motor (9) and the positioning coupling (101).

6. The dredging cutter head device for underwater silt deposition in hard soil layers according to claim 1, characterized in that, A hydraulic cylinder (22) is fixedly installed on the positioning plate (8). The number of hydraulic cylinders (22) is set to two, and the two hydraulic cylinders (22) are arranged on the positioning plate (8) in a left-right symmetrical manner. One end of the piston shaft of the hydraulic cylinder (22) is fixedly connected to a linkage rod (23), and one end of the linkage rod (23) is fixedly connected to the passive plate (17).

7. The dredging cutter head device for underwater silt deposition in hard soil layers according to claim 1, characterized in that, The side of the reamer seat (4) away from the linkage sleeve (3) is designed with a conical surface, and the bottom of the reamer seat (4) is provided with a mud inlet groove (401).

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