Dragging and sucking device for channel dredging ship and using method of dragging and sucking device

Abstract

The invention solves the problem that a suction pipe in a drag suction device is easy to block, and relates to the field of drag suction devices, in particular to a drag suction device for a channel desilting ship, which comprises a suction pipe communicated with the rear end of a drag head shell, two filter plate structures used for being matched with the rake tooth roller to form comprehensive interception are installed on the inner wall of the rake head shell, a cleaning mechanism used for discontinuously cleaning the surface of the rake tooth roller along with water flow impact is installed at the top of the rake head shell, and the rake tooth roller comprises a roller shaft rotationally installed between the inner walls of the two sides of the rake head shell. Five rows of rake tooth rods are fixedly installed on the outer surface of the roller shaft, and an arc-shaped filter plate is arranged between every two adjacent rows of rake tooth rods. A comprehensive filtering and intercepting defense line can be formed at the opening in the lower portion of the rake head shell, the protection effect on the roller shaft is effectively improved, and meanwhile blockage of the suction pipe is effectively avoided. And the device has an arc-shaped filter plate cleaning function.

Description

Technical Field

[0001] The invention relates to the technical field of rake suction devices, in particular to a rake suction device for a waterway dredging vessel and a use method thereof. Background Art

[0002] The silt, sand and other sediments accumulated in the waterway will cause the water depth of the waterway to become shallower, affecting the safety and efficiency of the passage of ships. In particular, factors such as tidal changes and uneven river flow rates can easily form siltation at the bottom of the waterway, reducing the effective depth of the waterway. At the same time, excessive siltation may also cause local blockage of the waterway, affecting the passage capacity of the waterway. Therefore, it is necessary to frequently use a dredging ship with a rake suction device to quickly and efficiently clean up large areas of siltation by rake suction. Compared with traditional manual cleaning or other equipment, the rake suction device can greatly improve the efficiency and speed of dredging operations, shorten the cycle of waterway maintenance, and reduce traffic interruptions caused by cleaning operations. The rake suction device is generally composed of rake teeth, suction pipes, suction pumps and other parts. When the rake teeth rotate or move forward to loosen the silt on the bottom of the waterway, larger pieces of debris in the silt will easily enter the rake tooth shaft and other key components and the suction mechanism, which may cause equipment damage and suction pipe blockage. Summary of the invention

[0003] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a scraper suction device for a waterway dredging ship and a method of using the same, so as to solve the problem that large pieces of debris are easily introduced into the suction pipe of the scraper suction device proposed in the above background technology, causing blockage thereof.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a rake suction device for a waterway dredging ship, comprising a suction pipe interconnected with the rear end of a rake head shell, a rake tooth roller for screening larger debris when loosening deposited silt is installed on the rake head shell, two filter plate structures for cooperating with the rake tooth roller to form a comprehensive interception are installed on the inner wall of the rake head shell, and a cleaning mechanism for intermittently cleaning the surface of the rake tooth roller with the impact of water flow is installed on the top of the rake head shell;

[0005] The rake tooth roller includes a roller shaft rotatably installed between the inner walls on both sides of the rake head shell, five rows of rake tooth rods are fixedly installed on the outer surface of the roller shaft, an arc filter plate is arranged between two adjacent rows of rake tooth rods, a plurality of filling blocks with a length consistent with the spacing between two adjacent rake tooth rods in each row are installed on the arc filter plate, and the spacing between two adjacent filling blocks is consistent with the thickness of the rake tooth rods, fastening rings are threadedly sleeved on both sides of the five arc filter plates, and a driving structure for driving the roller shaft to rotate at a uniform speed is installed on the rake head shell.

[0006] Preferably, one side surface of the arc filter plate is provided with grooves having the same number as the filling blocks, and a rectangular strip adapted to the grooves is integrally connected to the filling blocks;

[0007] The structure formed by combining the five arc-shaped filter plates is cylindrical.

[0008] Preferably, the rake tooth rod is formed by five arc-shaped filter plates in a cylindrical structure, and extends outward along the gap between two adjacent filling blocks;

[0009] The fastening ring is composed of an annular ring sleeved on the outer surface of the roller shaft and two threaded rings fixedly connected to the side of the annular plate close to the arc filter plate, and the two threaded rings are respectively sleeved on the inner and outer sides of the cylindrical structure formed by the five arc filter plates.

[0010] Preferably, the filter plate structure is provided with a plurality of slots for allowing the rake tooth rod to pass through the filter plate structure when the driving structure drives the roller shaft to rotate;

[0011] The width of the filter plate structure is smaller than the distance between the outer wall of the cylindrical structure formed by the combination of five arc-shaped filter plates and the inner wall of the outer shell of the drag head.

[0012] Preferably, the cleaning mechanism comprises an expansion frame installed on the top of the rake head shell, and a long brush assembly is installed on the top wall of the expansion frame for brushing and cleaning the outer surface of the arc filter plate when the roller shaft rotates.

[0013] Preferably, the long brush assembly consists of a spring structure connected to the top wall of the expansion frame, a storage cavity connected to the bottom of the spring structure, a comb plate installed at the bottom of the storage cavity and allowing the rake rod to pass through, and a soft-bristle brush detachably installed at the bottom of the comb plate, and the length of the comb plate is consistent with the spacing on the opposite sides of the two fastening rings.

[0014] Preferably, a water inlet assembly is installed on the top of the expansion frame for injecting water into the storage cavity so that when the spring structure is subjected to a top-down squeezing force, the bristle end of the soft brush is controlled to fit against the outer surface of the arc-shaped filter plate. A drainage assembly is installed at the bottom of the storage cavity, and the water inlet volume of the storage cavity is greater than the water discharge volume.

[0015] Preferably, the water inlet assembly includes a water inlet cover installed on the top of the expansion rack, and the water inlet cover is wide in the front and narrow in the back, and at least two telescopic tubes that pass through the expansion rack and are interconnected with the storage cavity are connected to the back of the water inlet cover, a solenoid valve is installed on the telescopic tube, and a triangular block located between the two telescopic tubes is installed inside the water inlet cover.

[0016] Preferably, the drainage assembly includes a water outlet pipe installed at the bottom of the storage cavity, a second solenoid valve is installed on the water outlet pipe, and a long flat water outlet head for changing the water outlet direction is connected to the tail end of the water outlet pipe.

[0017] Preferably, the method for using the rake suction device is as follows:

[0018] S1, by operating the sludge pump connected to the suction pipe, the sludge in the water bottom of the channel is transported to the sludge storage area on the dredging ship through the suction pipe;

[0019] S2, while cooperating with the driving structure, drives the roller shaft to drive several rake tooth rods and arc filter plates to rotate at a constant speed, loosens the bottom sludge and brings it into the sludge suction port of the suction pipe;

[0020] S3, by opening the solenoid valve 1, the telescopic conduit is adjusted from a closed state to a clear state, and then the water enters the storage cavity along the water inlet cover and the telescopic conduit and fills it up, increasing its counterweight so that the spring structure stretches downward until the bristle end of the soft brush fits the surface of the arc-shaped filter plate;

[0021] S4, close solenoid valve 1 and open solenoid valve 2, the water in the storage chamber is discharged outward along the water outlet pipe and the long flat water outlet head, reducing the dead weight of the storage chamber.

[0022] By means of the above technical solution, the present invention provides a trailing suction device for a waterway dredging ship and a method for using the same, which has at least the following beneficial effects:

[0023] 1. The channel dredging ship's rake suction device uses a cylindrical structure formed by five arc-shaped filter plates between the roller shaft and the rake tooth rod, and cooperates with two filter plate structures to form a comprehensive filtering and interception defense line at the lower opening of the rake head shell, effectively improving the protection effect on the roller shaft and effectively avoiding the blockage of the suction pipe.

[0024] 2. The cylindrical structure added to the several rake teeth rods in the rake suction device of the channel dredging ship for intercepting larger debris is composed of five modules spliced ​​together, and is formed by two fastening rings on the end of the cylindrical structure, so that the cylindrical structure itself is easy to disassemble and assemble, and is convenient for cleaning and maintenance.

[0025] 3. The channel dredging ship rake suction device utilizes the self-rotation of a cylindrical structure formed by the combination of five arc-shaped filter plates so that all parts of its surface are in contact with the soft brush, thereby achieving the purpose of cleaning the blockage in the filter tank on the surface of the cylindrical structure.

[0026] 4. The channel dredging ship-used rake suction device uses solenoid valve 1 and solenoid valve 2 to respectively control the closing and unblocking states of the telescopic guide tube and the water outlet pipe. When necessary, the water flow can impact the bottom wall of the storage cavity and cooperate with the weight of the injected water to stretch the spring structure downward, so that the soft brush descends to a height that fits closely with the outer surface of the cylindrical structure, and cooperates with the self-rotation of the cylindrical structure to achieve the effect of brushing and cleaning the filter tank. Conversely, the water in the storage cavity is discharged and the spring structure returns to its original state. Based on this, the consumption of the soft brush bristles can be effectively reduced, thereby reducing the frequency of replacement of the soft brush. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 It is a schematic diagram of the planar structure of the present invention;

[0030] Figure 3 It is a schematic diagram of the split structure of the rake roller of the present invention;

[0031] Figure 4 It is a structural schematic diagram of the filter plate structure of the present invention;

[0032] Figure 5 It is a schematic diagram of the installation structure of the rake roller and the cleaning mechanism of the present invention;

[0033] Figure 6 It is a structural schematic diagram of the cleaning mechanism of the present invention;

[0034] Figure 7 It is a schematic diagram of the disassembled structure of the long brush assembly and the water inlet assembly of the present invention.

[0035] In the figure:

[0036] 1. Drag head shell; 2. Suction pipe;

[0037] 3. Rake tooth roller; 301. Roller shaft; 302. Rake tooth rod; 303. Arc filter plate; 3031. Groove; 304. Filling block; 3041. Rectangular strip; 305. Fastening ring; 306. Driving structure;

[0038] 4. Filter plate structure; 401. Notch;

[0039] 5. Cleaning mechanism; 501. Expansion rack; 502. Long brush assembly; 5021. Spring structure; 5022. Storage chamber; 5023. Comb plate; 5024. Soft brush; 503. Water inlet assembly; 5031. Water inlet cover; 5032. Telescopic guide tube; 5033. Solenoid valve 1; 5034. Triangle block; 504. Drainage assembly; 5041. Water outlet pipe; 5042. Solenoid valve 2; 5043. Long flat water outlet head. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. In the description of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0041] Embodiment 1

[0042] At present, the conventional structure of the rake suction device consists of a shell, a suction mechanism, and rake teeth. When the rake teeth are driven to rotate or move forward to loosen the silt in the waterway bottom, larger debris in the silt will easily enter the rake tooth shaft and other key components and the suction mechanism, which may cause damage to the equipment. Figure 1-7 As shown, this embodiment proposes a rake suction device for a waterway dredging ship, which can effectively prevent large pieces of debris in the sludge from entering the key parts of the rake teeth and the pipeline of the suction mechanism. The rake suction device has a suction pipe 2 that is interconnected with the rear end of the rake head shell 1. The suction pipe 2 is externally connected to a dredging pump, which is intended to generate suction at the end of the suction pipe 2 to absorb the sludge in the lower part of the rake head shell 1 and finally pump it to the dredging ship used in combination with the rake suction device. The rake roller 3 installed on the rake head shell 1 can effectively loosen the deposited silt and block the large pieces of debris in the deposited silt, thereby increasing the protection of the rake roller 3 itself and the dredging pump externally connected to the suction pipe 2. The two filter plate structures 4 installed on the inner wall of the rake head shell 1 are used to cooperate with the rake roller 3 to form a comprehensive interception, which is intended to further enhance the blocking effect of large pieces of debris. The cleaning mechanism 5 installed on the top of the rake head shell 1 is used to intermittently clean the surface of the rake roller 3 with the impact of the water flow.

[0043] Specifically, the rake tooth roller 3 includes a roller shaft 301 rotatably mounted between the inner walls of the two sides of the rake head housing 1, five rows of rake tooth rods 302 are fixedly mounted on the outer surface of the roller shaft 301, an arc filter plate 303 is arranged between two adjacent rows of rake tooth rods 302, and a plurality of filling blocks 304 with a length consistent with the spacing between two adjacent rake tooth rods 302 in each row of rake tooth rods 302 are installed on the arc filter plate 303, and the spacing between two adjacent filling blocks 304 is consistent with the thickness of the rake tooth rods 302. Both sides of the arc filter plates 303 are threadedly sleeved with fastening rings 305, and a driving structure 306 for driving the roller shaft 301 to rotate at a uniform speed is installed on the rake head housing 1. The filter plate structure 4 is provided with a plurality of slots 401 for allowing the rake tooth rod 302 to pass through the filter plate structure 4 when the driving structure 306 drives the roller shaft 301 to rotate, and the width of the slot 401 is twice the width of the rake tooth rod 302, so as to prevent the silt excavated by the rake tooth rod 302 rotating backward from being intercepted by the filter plate structure 4. The width of the filter plate structure 4 is smaller than the distance between the outer wall of the cylindrical structure formed by the combination of the five arc filter plates 303 and the inner wall of the rake head housing 1. The driving structure 306 is composed of a motor, a driving wheel and a driven wheel, and is intended to drive the roller shaft 301 to rotate at a uniform speed from the top to the front and then to the bottom by running the motor, thereby driving a number of rake tooth rods 302 to follow the rotation. During the rotation, the tip is inserted into the sediment and loosened, and then driven upward, and the suction force generated at the end of the suction pipe 2 is cooperated to suck away this part of the sediment. When the rake tooth rod 302 rotates, the arc filter plate 303 rotates between the two filter plate structures 4, and the two filter plate structures 4 and the cylindrical structure formed by the combination of five arc filter plates 303 can form a comprehensive filtering defense line at the lower opening of the rake head shell 1, thereby effectively preventing larger debris in the sediment from entering the upper area of ​​this filtering defense line, thereby effectively improving the protection effect of the roller shaft 301 and effectively avoiding the clogging of the suction pipe 2.

[0044] Embodiment 2

[0045] In accordance with the above-mentioned first embodiment, under normal circumstances, the cylindrical structure added to the plurality of rake tooth rods 302 for intercepting larger debris is integrated with the rake tooth rods 302 themselves. However, in this case, if the cylindrical structure is blocked by debris or sludge, it is difficult to clean, which increases the complexity of maintenance. Figure 3As shown, this embodiment uses the relevant structure to facilitate the disassembly and assembly of the five arc filter plates 303, thereby facilitating the cleaning of the sludge inside. A surface of one side of the arc filter plate 303 is provided with grooves 3031 that are the same in number as the filling blocks 304, and a rectangular strip 3041 that is adapted to the grooves 3031 is integrally connected to the filling blocks 304, and the structure formed by the combination of the five arc filter plates 303 is cylindrical. The rake tooth rod 302 extends outward along the gap between two adjacent filling blocks 304 in the cylindrical structure formed by five arc-shaped filter plates 303, and the portion of the rake tooth rod 302 outside the cylindrical structure is one-third of the entire rake tooth rod 302. Two laterally adjacent filling blocks 304 fit the two sides of the rake tooth rod 302 near the tip, which can increase the structural strength of the rake tooth rod 302. The fastening ring 305 consists of an annular ring sleeved on the outer surface of the roller shaft 301 and two threaded rings fixedly connected to one side of the annular plate near the arc-shaped filter plate 303, and the two threaded rings are respectively sleeved on the inner and outer sides of the cylindrical structure formed by the five arc-shaped filter plates 303.

[0046] When the arc filter plate 303 is combined with the five rows of rake tooth rods 302, one of the arc filter plates 303 is placed between two adjacent rows of rake tooth rods 302, and then the side of the other arc filter plate 303 with the filling block 304 passes through the corresponding row of rake tooth rods 302, and the rectangular bar 3041 is controlled to be inserted into the groove 3031 in the previous arc filter plate 303, and then the remaining arc filter plates 303 are spliced ​​in this way to finally form a cylindrical structure. On this basis, a fastening ring 305 is used to be rotatably sleeved on the end of this cylindrical structure to maintain the stability of this cylindrical structure. At the same time, the entire arc filter plate 303 and the rake tooth rod 302 are in a detachable combination state, which is convenient for replacement or cleaning.

[0047] Embodiment 3

[0048] Based on the above, the arc filter plate 303 mounted on the five-row rake tooth rod 302 may be entangled with some impurities in the filter slot during the process of filtering and intercepting larger debris, so as to block the filter slot, thereby affecting the subsequent use effect. In order to solve this problem, Figure 5-Figure 7As shown, the cleaning mechanism 5 includes an expansion frame 501 installed on the top of the rake head housing 1, and a long brush assembly 502 is installed on the top wall of the expansion frame 501 for brushing and cleaning the outer surface of the arc filter plate 303 when the roller 301 rotates. The long brush assembly 502 consists of a spring structure 5021 connected to the top wall of the expansion frame 501, a storage cavity 5022 connected to the bottom of the spring structure 5021, a comb plate 5023 installed at the bottom of the storage cavity 5022 and allowing the rake tooth rod 302 to pass through, and a soft brush 5024 detachably installed at the bottom of the comb plate 5023, and the length of the comb plate 5023 is consistent with the spacing on the opposite side of the two fastening rings 305. When the bristle end of the soft brush 5024 is in close contact with the outer surface of the arc filter plate 303, as the driving structure 306 operates, the rake tooth rod 302 and the arc filter plate 303 are driven to rotate, so that the cylindrical structure surface formed by the combination of the five arc filter plates 303 can be controlled to contact the soft brush 5024, thereby achieving the purpose of cleaning the blockage in the filter tank on the cylindrical structure surface.

[0049] Embodiment 4

[0050] Following the above-mentioned embodiment 3, the bristle end of the soft brush 5024 is always in close contact with the outer surface of the cylindrical structure, which will increase the consumption of the bristles of the soft brush 5024, thereby reducing its service life. Based on this, in order to effectively reduce the replacement frequency of the soft brush 5024, such as Figure 6-Figure 7As shown, a water inlet assembly 503 is installed on the top of the expansion frame 501 for injecting water into the storage cavity 5022 so that when the spring structure 5021 is subjected to a top-down squeezing force, the bristle end of the soft brush 5024 is controlled to fit with the outer surface of the arc filter plate 303. A drainage assembly 504 is installed at the bottom of the storage cavity 5022, and the water inlet amount of the storage cavity 5022 is greater than the drainage amount. The water inlet assembly 503 includes a water inlet cover 5031 installed on the top of the expansion frame 501, and the water inlet cover 5031 is installed on the top of the expansion frame 501. The water cover 5031 is wide in the front and narrow in the back. At least two telescopic conduits 5032 are connected to the back of the water inlet cover 5031, which pass through the expansion frame 501 and communicate with the storage cavity 5022. A solenoid valve 5033 is installed on the telescopic conduit 5032. A triangular block 5034 located between the two telescopic conduits 5032 is installed inside the water inlet cover 5031 to change the flow direction of the local water body flowing into the water inlet cover 5031 so that the water body flows into the telescopic conduit 5032. When the spring structure 5021 is not subjected to a large force, it maintains a normal length state, and at this time, the bristle end of the soft brush 5024 has a certain distance from the outer surface of the cylindrical structure formed by the combination of the five arc filter plates 303, so as to ensure that when the surface of the arc filter plate 303 does not need to be cleaned, the soft brush 5024 is not affected by friction, thereby effectively extending its service life. On the contrary, when it is necessary to clean the filter tank on the surface of the arc filter plate 303, the solenoid valve 5033 is opened to make the telescopic guide tube 5032 in a cleared state, and the forward movement of the entire suction device on the bottom of the water is coordinated so that the water flow impacts into the water inlet cover 5031, and then enters the storage cavity 5022 along the telescopic guide tube 5032. Under the dual effects of the impact force of the water flow on the bottom wall of the storage cavity 5022 and the weight of the injected water, the spring structure 5021 is stretched downward, thereby controlling the comb plate 5023 and the soft brush 5024 to descend, so that the bristle end of the soft brush 5024 is closely fitted with the outer surface of the cylindrical structure, and the cylindrical structure is rotated to achieve the effect of brushing and cleaning the filter tank.

[0051] like Figure 7As shown, the drainage assembly 504 includes a water outlet pipe 5041 installed at the bottom of the storage cavity 5022, a solenoid valve 2 5042 is installed on the water outlet pipe 5041, and a long flat water outlet head 5043 for changing the water outlet direction is connected to the tail end of the water outlet pipe 5041. In accordance with the above, after the soft brush 5024 cleans the surface of the cylindrical structure, the solenoid valve 1 5033 is closed and the solenoid valve 2 5042 is opened at the same time, so that the water outlet pipe 5041 is in a cleared state, so that the water inside the storage cavity 5022 can be discharged outward, reducing its dead weight, so that the spring structure 5021 returns to its original state. In addition, when the device is in the water body, the solenoid valve 1 5033 and the solenoid valve 2 5042 can also be opened at the same time. Since the water inflow of the storage cavity 5022 is greater than the water outflow, the height of the soft brush 5024 can still be lowered.

[0052] The steps for using the rake suction device are as follows:

[0053] S1, by operating the sludge suction pump connected to the suction pipe 2, the sludge in the water bottom of the channel is transported to the sludge storage area on the dredging ship through the suction pipe 2;

[0054] S2, while cooperating with the driving structure 306, driving the roller 301 to drive the plurality of rake tooth rods 302 and the arc filter plate 303 to rotate at a constant speed, loosening the bottom sludge and bringing it into the sludge suction port of the suction pipe 2;

[0055] S3, by opening the electromagnetic valve 5033, the telescopic conduit 5032 is adjusted from a closed state to a clear state, and then the water enters the storage cavity 5022 along the water inlet cover 5031 and the telescopic conduit 5032 and fills it up, increasing its counterweight, so that the spring structure 5021 is stretched downward until the bristle end of the soft brush 5024 is attached to the surface of the arc filter plate 303;

[0056] S4. Close the electromagnetic valve 1 5033 and open the electromagnetic valve 2 5042. The water in the storage chamber 5022 is discharged outward along the water outlet pipe 5041 and the long flat water outlet head 5043, thereby reducing the deadweight of the storage chamber 5022.

[0057] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A drag suction device for a waterway dredging vessel, comprising a suction pipe (2) interconnected with the rear end of a drag head housing (1), characterized in that: The rake head housing (1) is provided with a rake tooth roller (3) for screening larger debris when loosening deposited silt, and the inner wall of the rake head housing (1) is provided with two filter plate structures (4) for cooperating with the rake tooth roller (3) to form a comprehensive interception, and the top of the rake head housing (1) is provided with a cleaning mechanism (5) for intermittently cleaning the surface of the rake tooth roller (3) with the impact of water flow; The rake tooth roller (3) comprises a roller shaft (301) rotatably mounted between the inner walls of both sides of a rake head shell (1); five rows of rake tooth rods (302) are fixedly mounted on the outer surface of the roller shaft (301); an arc filter plate (303) is arranged between two adjacent rows of rake tooth rods (302); a plurality of filling blocks (304) having a length consistent with the spacing between two adjacent rake tooth rods (302) in each row of rake tooth rods (302) are mounted on the arc filter plate (303); the spacing between two adjacent filling blocks (304) is consistent with the thickness of the rake tooth rods (302); fastening rings (305) are threadedly sleeved on both sides of the five arc filter plates (303); and a driving structure (306) for driving the roller shaft (301) to rotate at a uniform speed is mounted on the rake head shell (1).

2. A trailing suction device for a waterway dredging vessel according to claim 1, characterized in that: A surface on one side of the arc-shaped filter plate (303) is provided with grooves (3031) whose number is the same as that of the filling blocks (304); and a rectangular strip (3041) adapted to the grooves (3031) is integrally connected to the filling blocks (304); The structure formed by combining the five arc-shaped filter plates (303) is cylindrical.

3. A trailing suction device for a channel dredging vessel according to claim 2, characterized in that: The rake tooth rod (302) is formed in a cylindrical structure by five arc-shaped filter plates (303), and extends outward along the gap between two adjacent filling blocks (304); The fastening ring (305) is composed of an annular ring sleeved on the outer surface of the roller shaft (301) and two threaded rings fixedly connected to the side of the annular plate close to the arc-shaped filter plate (303), and the two threaded rings are respectively sleeved on the inner side and the outer side of the cylindrical structure formed by the five arc-shaped filter plates (303).

4. A trailing suction device for a waterway dredging vessel according to claim 1, characterized in that: The filter plate structure (4) is provided with a plurality of notches (401) for allowing the rake tooth rod (302) to pass through the filter plate structure (4) when the driving structure (306) drives the roller shaft (301) to rotate; The width of the filter plate structure (4) is smaller than the distance between the outer wall of the cylindrical structure formed by combining five arc-shaped filter plates (303) and the inner wall of the drag head shell (1).

5. A trailing suction device for a waterway dredging vessel according to claim 1, characterized in that: The cleaning mechanism (5) comprises an expansion frame (501) mounted on the top of the drag head housing (1), and a long brush assembly (502) is mounted on the top wall of the expansion frame (501) for brushing and cleaning the outer surface of the arc filter plate (303) when the roller (301) rotates.

6. A trailing suction device for a waterway dredging vessel according to claim 5, characterized in that: The long brush assembly (502) is composed of a spring structure (5021) connected to the top wall of the expansion frame (501), a storage cavity (5022) connected to the bottom of the spring structure (5021), a comb plate (5023) installed at the bottom of the storage cavity (5022) and allowing the rake rod (302) to pass through, and a soft brush (5024) detachably installed at the bottom of the comb plate (5023), and the length of the comb plate (5023 is consistent with the distance between the opposite sides of the two fastening rings (305).

7. A trailing suction device for a waterway dredging vessel according to claim 6, characterized in that: A water inlet assembly (503) is installed on the top of the expansion frame (501) for injecting water into the storage cavity (5022) so that the spring structure (5021) is subjected to a top-down squeezing force, thereby controlling the bristle end of the soft brush (5024) to fit with the outer surface of the arc-shaped filter plate (303). A drainage assembly (504) is installed at the bottom of the storage cavity (5022), and the water inlet amount of the storage cavity (5022) is greater than the water discharge amount.

8. A trailing suction device for a waterway dredging vessel according to claim 7, characterized in that: The water inlet assembly (503) comprises a water inlet cover (5031) installed on the top of the expansion frame (501), and the water inlet cover (5031) is wide at the front and narrow at the back. At least two telescopic conduits (5032) passing through the expansion frame (501) and communicating with the storage cavity (5022) are connected to the back of the water inlet cover (5031), and a solenoid valve (5033) is installed on the telescopic conduit (5032). A triangular block (5034) located between the two telescopic conduits (5032) is installed inside the water inlet cover (5031).

9. A trailing suction device for a waterway dredging vessel according to claim 8, characterized in that: The drainage assembly (504) comprises a water outlet pipe (5041) installed at the bottom of the storage cavity (5022), a second solenoid valve (5042) is installed on the water outlet pipe (5041), and a long flat water outlet head (5043) for changing the water outlet direction is connected to the tail end of the water outlet pipe (5041).

10. A trailing suction device for a waterway dredging vessel according to any one of claims 1 to 9, characterized in that: The steps for using the rake suction device are as follows: S1, by operating the sludge suction pump connected to the suction pipe (2), the sludge on the bottom of the channel is transported to the sludge storage area on the dredging ship through the suction pipe (2); S2, while cooperating with the driving structure (306), driving the roller (301) to drive the plurality of rake tooth rods (302) and the arc filter plate (303) to rotate at a constant speed, loosening the bottom sludge and bringing it into the sludge suction port of the suction pipe (2); S3, by opening the electromagnetic valve 1 (5033), the telescopic conduit (5032) is adjusted from a closed state to a clear state, and then the water enters the interior of the storage cavity (5022) along the water inlet cover (5031) and the telescopic conduit (5032) and fills it up, and the counterweight is increased, so that the spring structure (5021) is stretched downward until the bristle end of the soft brush (5024) is in contact with the surface of the arc-shaped filter plate (303); S4, close the electromagnetic valve 1 (5033), and open the electromagnetic valve 2 (5042), so that the water in the storage chamber (5022) is discharged outward along the water outlet pipe (5041) and the long flat water outlet head (5043), thereby reducing the deadweight of the storage chamber (5022).

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