Dredging equipment of a drag suction dredger

Abstract

The present invention relates to the technical field of drag suction dredgers and discloses a dredging device for a drag suction dredger, comprising a drag head mud suction shell and a top cover, the top cover being fixedly connected to one side of the drag head mud suction shell, connecting vanes being integrally provided on both sides of the top of the drag head mud suction shell, a seal cover being fixedly connected to the top of the drag head mud suction shell, a drive mechanism being provided inside the seal cover, transmission mechanisms being provided on both sides of the drag head mud suction shell, a rolling prevention mechanism being provided between the two transmission mechanisms, a collision prevention mechanism being provided at the bottom of the drag head mud suction shell, a scraper mechanism being provided inside the drag head mud suction shell, and a slag removal mechanism being provided on the top surface of the drag head mud suction shell. The dredging equipment of this drag suction dredger can clean stones trapped on the surface through continuous rotation of the barrier drum and cooperation with the scraper mechanism, preventing clogging of the second passage hole, which is the silt adsorption inlet, and ensuring smooth silt adsorption.

Description

Technical Field

[0001] The present invention relates to the technical field of drag suction dredgers, and specifically, it is a dredging device for a drag suction dredger.

Background Art

[0002] A drag suction dredger is a type of suction dredger. It sucks muddy water through drag heads attached to both sides or the stern of the hull, operates to navigate while sucking muddy water, and makes full use of dredging to loosen the soil. A bottom-opening mud tank is installed inside the ship, and the capacity of the tank indicates the size of the ship. A drag suction dredger is a large self-propelled hopper dredger equipped with a drag head excavator and a hydraulic mud suction device. During dredging, the drag suction pipe is lowered to the river bottom, and using the vacuum effect of the mud pump, muddy water is sucked from the river bottom into the mud tank of the dredger by the drag head and the mud suction pipe. When the mud tank is full, the drag head is retrieved, the ship sails to the mud dumping area, the door is opened to unload the mud, or the dredged mud is directly discharged from the ship. There are also dredgers that can spontaneously suck out and refill the mud unloaded into the mud tank. This dredger has excellent navigation performance and can self-navigate, self-load, and self-unload. Since it is in a navigation state during operation, it does not require a positioning device. It is suitable for the excavation and maintenance of narrow and long coastal harbor waterways that are not protected, and is most efficient for silt excavation.

[0003] Most of the dredging devices of commercially available drag suction dredgers have a grille inside the drag head to prevent large stones from entering the mud suction pipe. However, after long-term use, the clogged stones are absorbed by the negative pressure of the mud suction pipe and accumulate a lot on the surface of the grille, causing the grille to become clogged and easily affecting the mud suction efficiency. Therefore, there is a need for a dredging device for a drag suction dredger that can clean the stones captured on the surface by rotation, avoid clogging of the silt adsorption inlet, and ensure the smoothness of silt adsorption.

Summary of the Invention

[0004] In contrast to the shortcomings of the prior art, the present invention provides a dredging device for a drag suction dredger that solves the problems described in the background above. [Means for solving the problem]

[0005] The present invention provides the following technical solution: a dredging device for a drag suction dredger, The drag head mud suction shell and a top cover are included, the top cover being fixedly connected to one side of the drag head mud suction shell, connecting vane plates being integrally provided on both sides of the top of the drag head mud suction shell, a seal cover being fixedly connected to the top of the drag head mud suction shell, a drive mechanism being provided inside the seal cover, a transmission mechanism being provided on both sides of the drag head mud suction shell, a rolling prevention mechanism being provided between the two transmission mechanisms, a collision prevention mechanism being provided at the bottom of the drag head mud suction shell, a scraper mechanism being provided inside the drag head mud suction shell, a debris removal mechanism being provided on the upper surface of the drag head mud suction shell, a hydraulic shock mechanism being provided at the bottom of one side of the drag head mud suction shell, and a connecting end being provided on one side of the drag head mud suction shell.

[0006] Preferably, the drive mechanism includes a motor frame, a drive motor, an output shaft, a transmission shaft, a driven gear, and a drive gear, wherein the motor frame is fixedly connected to the upper surface of the drag head mud suction shell, the drive motor is fixedly mounted to the inner wall of the motor frame, the output shaft is fixedly connected to the output end of the drive motor via a coupling, the transmission shaft is rotatably connected to the inner wall of a connecting vane plate, and the connecting vane plate is fixedly connected to a seal cover, the driven gear is fixedly mounted to the surface of the transmission shaft, and the drive gear is fixedly mounted to the surface of the output shaft, and the drive gear and the driven gear are connected in mesh.

[0007] Preferably, the drive mechanism further includes a counterweight wheel, the counterweight wheel being fixedly fitted to the outer wall of the transmission shaft, and the shape of the counterweight wheel being cylindrical.

[0008] Preferably, the transmission mechanism includes a connecting cylinder, a driven transmission wheel, a drive transmission wheel, a belt, a connecting bearing, a rotary seal, and a side seal cover, wherein the connecting bearing and the rotary seal are both fixedly mounted on the surface of the connecting cylinder, there are two connecting cylinders, and both connecting cylinders are rotatably connected to the inner walls on both sides of the drag head mud suction shell, respectively, via the connecting bearing and the rotary seal, the side seal cover is fixedly connected to both sides of the drag head mud suction shell, and the connecting cylinder is rotatably connected to the side seal cover via the connecting bearing and the rotary seal, the driven transmission wheel is fixedly mounted on the outer wall of the connecting cylinder, the drive transmission wheel is fixedly mounted to the outer walls at both ends of the transmission shaft, and the belt is mounted between the driven transmission wheel and the drive transmission wheel.

[0009] Preferably, the rolling prevention mechanism includes a barrier drum and a first through hole, the barrier drum being fixedly connected between two connecting cylinders, and the first through hole being drilled through the surface of the barrier drum.

[0010] Preferably, the rolling prevention mechanism further includes a centrifugal cylinder, reinforcing columns, a second through hole, and a centrifugal cavity, wherein the centrifugal cylinder is fixedly connected to the inner wall of the barrier drum, the reinforcing columns are fixedly inserted into the inner wall of the centrifugal cylinder and are fixedly connected to a connecting cylinder, the second through hole is drilled through the surface of the centrifugal cylinder and the second through hole and the first through hole correspond to each other, and the centrifugal cavity is provided penetrating the interior of the centrifugal cylinder and has an hourglass shape.

[0011] Preferably, the collision prevention mechanism includes a connecting block, an axle, rollers, and anti-slip tires, wherein the connecting block is integrated with the bottom of the draghead mud suction shell, the axle is rotatably connected to the inner wall of the connecting block, the rollers are fixedly mounted to both ends of the axle, and the anti-slip tires are fixedly mounted to the surface of the axle.

[0012] Preferably, the scraper mechanism includes a scraper frame and a trapping claw, wherein there are two scraper frames, both of which are fixedly connected to the inner wall of the draghead mud suction shell, the trapping claw is provided integrally with one side of the scraper frame, and the barrier drum is located between the two scraper frames.

[0013] Preferably, the sludge removal mechanism includes a sludge port, a one-way plate, and a lead, wherein the sludge port is opened through the upper surface of the draghead mud suction shell and is located on one side of the scraper frame, the one-way plate is rotatably connected to the upper surface of the draghead mud suction shell and is located on one side of the sludge port, and the lead is fixedly connected to the surface of the one-way plate and is slidably connected to the draghead mud suction shell.

[0014] Preferably, the hydraulic shock mechanism includes a water tank and a high-pressure water pipe, the water tank being fixedly connected to the bottom of the draghead mud suction shell, the high-pressure water pipe being fixedly connected to the top of the water tank, and a high-pressure nozzle being provided at the bottom of the water tank, and the water tank being located away from the connecting end of the roller. [Effects of the Invention]

[0015] Compared to the prior art, the present invention has the following beneficial effects.

[0016] 1. The dredging device of the drag suction dredger is provided with a drag head mud suction shell, top cover, connecting blade plate, seal cover, drive mechanism, transmission mechanism, rolling prevention mechanism, collision prevention mechanism, scraper mechanism, slag removal mechanism, and hydraulic shock mechanism. Through the continuous rotation of the barrier drum and its coordination with the scraper mechanism, stones trapped on the surface can be cleaned, clogging of the second passage hole, which is the silt adsorption inlet, is avoided, and smooth silt adsorption is ensured.

[0017] 2. In the dredging device of the drag suction dredger, a centrifugal cylinder, reinforcing columns, a second through hole, and a centrifugal cavity are provided. When the centrifugal cylinder rotates, centrifugal force is generated, and large stones that are prone to clogging the inner wall of the centrifugal cavity are subjected to a large centrifugal force. They are also blocked by the second through hole, rotate gradually away from the axis, and are discharged from the centrifugal cavity. In this way, silt particles with small volume and mass are subjected to less centrifugal force and are directly sucked into the inside of the drag head mud suction shell through the second through hole. [Brief explanation of the drawing]

[0018] [Figure 1] This is a schematic diagram of the structure of the present invention. [Figure 2] This is a schematic diagram of the structure of the drive mechanism of the present invention. [Figure 3] This is an enlarged view of part A in Figure 2 of the present invention. [Figure 4] This is a schematic diagram of the structure of the rolling prevention mechanism of the present invention. [Figure 5] This is a schematic diagram of the structure of the litter removal mechanism of the present invention. [Figure 6] This is a side view of the centrifugal tube of the present invention. [Figure 7] This is a schematic diagram of the internal exploded structure of the rolling prevention mechanism of the present invention. [Modes for carrying out the invention]

[0019] The following will clearly and completely describe the technical solution in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. It is clear that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the present invention.

[0020] Referring to FIGS. 1 to 7, the dredging device of the drag suction dredger includes a drag head mud suction shell 1 and a top cover 2. The top cover 2 is fixedly connected to one side of the drag head mud suction shell 1. Connection wing plates 3 are integrally provided on both sides of the top of the drag head mud suction shell 1. A seal cover 4 is fixedly connected to the top of the drag head mud suction shell 1. A driving mechanism is provided inside the seal cover 4. Transmission mechanisms are provided on both sides of the drag head mud suction shell 1. A rolling prevention mechanism is provided between the two transmission mechanisms. A collision prevention mechanism is provided at the bottom of the drag head mud suction shell 1. A scraper mechanism is provided inside the drag head mud suction shell 1. A slag discharge mechanism is provided on the upper surface of the drag head mud suction shell 1. A hydraulic impact mechanism is provided at the bottom of one side of the drag head mud suction shell 1. A connection end 12 is provided on one side of the drag head mud suction shell 1. By providing the drag head mud suction shell 1, the top cover 2, the connection wing plates 3, the seal cover 4, the driving mechanism, the transmission mechanism, the rolling prevention mechanism, the collision prevention mechanism, the scraper mechanism, the slag discharge mechanism, and the hydraulic impact mechanism, through the continuous rotation of the barrier drum 701 and the cooperation with the scraper mechanism, the stones captured on the surface can be cleaned, avoiding the blockage of the second through hole 705 which is the silt adsorption inlet, and ensuring the smoothness of silt adsorption.

[0021] Here, the drive mechanism includes a motor frame 501, a drive motor 502, an output shaft 503, a transmission shaft 504, a driven gear 505, and a drive gear 506. The motor frame 501 is fixedly connected to the upper surface of the drag head mud suction shell 1. The drive motor 502 is fixedly mounted on the inner wall of the motor frame 501. The output shaft 503 is fixedly connected to the output end of the drive motor 502 through a coupling. The transmission shaft 504 is rotatably connected to the inner wall of the connection wing plate 3, and the connection wing plate 3 is fixedly connected to the seal cover 4. The driven gear 505 is fixedly mounted on the surface of the transmission shaft 504. The drive gear 506 is fixedly mounted on the surface of the output shaft 503, and the drive gear 506 and the driven gear 505 are meshed and connected, which is advantageous for supplying power for the rotation of the barrier drum 701 and the centrifugal cylinder 703.

[0022] Here, the drive mechanism further includes a counterweight wheel 507. The counterweight wheel 507 is fixedly fitted on the outer wall of the transmission shaft 504, and the shape of the counterweight wheel 507 is cylindrical. Thereby, the rotational inertia is improved, and it is less likely to occur that the connection cylinder 601 stops rotating due to interference by silt or seawater.

[0023] Here, the transmission mechanism includes a connecting cylinder 601, a driven transmission wheel 602, a drive transmission wheel 603, a belt 604, a connecting bearing 605, a rotating seal 606, and a side seal cover 607, both of which are fixedly mounted on the surface of the connecting cylinder 601, and there are two connecting cylinders 601, both of which rotate on the inner walls on both sides of the drag head mud suction shell 1 via the connecting bearing 605 and the rotating seal 606. The side seal cover 607 is rotatably connected to both sides of the drag head mud suction shell 1, and the connecting cylinder 601 is rotatably connected to the side seal cover 607 via the connecting bearing 605 and the rotating seal 606, the driven drive wheel 602 is fixedly mounted to the outer wall of the connecting cylinder 601, the drive drive wheel 603 is fixedly mounted to the outer walls of both ends of the transmission shaft 504, and the belt 604 is mounted between the driven drive wheel 602 and the drive drive wheel 603. This facilitates transmission and sealing.

[0024] Here, the rolling prevention mechanism includes a barrier drum 701 and a first through hole 702, the barrier drum 701 being fixedly connected between two connecting cylinders 601, and the first through hole 702 being drilled through the surface of the barrier drum 701. This allows stones trapped on its surface to be cleaned by the rotation of the barrier drum 701.

[0025] Here, the rolling prevention mechanism further includes a centrifugal cylinder 703, a reinforcing column 704, a second through hole 705, and a centrifugal cavity 706, wherein the centrifugal cylinder 703 is fixedly connected to the inner wall of the barrier drum 701, the reinforcing column 704 is fixedly inserted into the inner wall of the centrifugal cylinder 703 and is fixedly connected to the connecting cylinder 601, the second through hole 705 is opened through the surface of the centrifugal cylinder 703 and the second through hole 705 and the first through hole 702 correspond to each other, and the centrifugal cavity 706 is provided penetrating the interior of the centrifugal cylinder 703 and the shape of the centrifugal cavity 706 is hourglass-shaped. The centrifugal cylinder 703, reinforcing column 704, second through hole 705, and centrifugal cavity 706 are provided so that when the centrifugal cylinder 703 rotates, centrifugal force is generated, and stones with a large mass on the inner wall of the centrifugal cavity 706 that are prone to clogging are subjected to a large centrifugal force and are blocked by the second through hole 705, causing them to rotate gradually away from the axis and be discharged from the centrifugal cavity 706. In this way, silt particles with a small volume and mass are subjected to a small centrifugal force and are directly sucked into the interior of the draghead mud suction shell 1 through the second through hole 705.

[0026] Here, the collision prevention mechanism includes a connecting block 801, an axle 802, rollers 803, and anti-slip tires 804, the connecting block 801 being integrated into the bottom of the drag head mud suction shell 1, the axle 802 being rotatably connected to the inner wall of the connecting block 801, the rollers 803 being fixedly mounted to both ends of the axle 802, and the anti-slip tires 804 being fixedly mounted to the surface of the axle 802. This makes it easier to release the force by converting the impact force into rolling motion of the rollers 803.

[0027] Here, the scraper mechanism includes a scraper frame 901 and a capture claw 902, with two scraper frames 901, both of which are fixedly connected to the inner wall of the draghead mud suction shell 1, the capture claw 902 being integrated into one side of the scraper frame 901, and the barrier drum 701 being located between the two scraper frames 901. This makes it easier to prevent scraped stones from being trapped on the surface of the barrier drum 701.

[0028] Here, the debris removal mechanism includes a debris removal port 1001, a one-way plate 1002, and a lead 1003, wherein the debris removal port 1001 is opened through the upper surface of the drag head mud suction shell 1 and is located on one side of the scraper frame 901, the one-way plate 1002 is rotatably connected to the upper surface of the drag head mud suction shell 1 and is located on one side of the debris removal port 1001, and the lead 1003 is fixedly connected to the surface of the one-way plate 1002 and is slidably connected to the drag head mud suction shell 1. This facilitates the discharge of stones scraped by the capture claws 902.

[0029] Here, the hydraulic shock mechanism includes a water tank 1101 and a high-pressure water pipe 1102. The water tank 1101 is fixedly connected to the bottom of the drag head mud suction shell 1, and the high-pressure water pipe 1102 is fixedly connected to the top of the water tank 1101. A high-pressure nozzle is provided at the bottom of the water tank 1101, and the water tank 1101 is located on the side away from the connecting end 12 of the roller 803. This helps to prevent collisions to one side of the water tank 1101.

[0030] The principle of operation is as follows: When in use, the drag head mud suction shell 1 is connected to the mud suction pipe, the drive motor 502 is started, and negative pressure is generated by the mud suction pump. As the mud suction pipe extends to the drag head mud suction shell 1, the drag head mud suction shell 1 continuously sucks silt from one side through the barrier drum 701 and centrifugal cylinder 703 to the mud suction pipe. As the silt passes through the barrier drum 701, the drive motor 502 rotates the drive gear 506 via the output shaft 503, the drive gear 506 rotates the driven gear 505, which in turn rotates the transmission shaft 504, the transmission shaft 504 rotates the drive transmission wheel 603, the drive transmission wheel 603 rotates the driven transmission wheel 602 via the belt 604, which in turn rotates the connecting cylinder 601, causing the barrier drum 701 and centrifugal cylinder 703 to rotate synchronously. At this time, silt on one side of the draghead mud suction shell 1 enters the interior of the draghead mud suction shell 1 through the first through hole 702 and the second through hole 705, and the stones are blocked by the surface of the barrier drum 701. Next, the rotation of the barrier drum 701 carries the stones to the slag outlet 1001, and then the rotation of the barrier drum 701 scrapes the stones off with the capturing claws 902, pushing open the one-way plate 1002 and discharging them from the slag outlet 1001. Silt at both ends of the centrifugal cylinder 703 is sucked in by the negative pressure and enters the interior of the centrifugal cavity 706. Because the centrifugal cylinder 703 rotates continuously and generates centrifugal force, stones with a large mass on the inner wall of the centrifugal cavity 706 that are prone to clogging are subjected to a large centrifugal force and are stopped by the second through hole 705. In this way, the stones rotate gradually away from the axis and are finally discharged from the centrifugal cavity 706 along the inner wall. Silt particles, being small in volume and mass, experience less centrifugal force and are directly drawn into the draghead mud suction shell 1 through the second through-hole 705. This ensures that the first through-hole 702 and the second through-hole 705 remain unclogging at all times.

[0031] While embodiments of the present invention have been shown and described, those skilled in the art will understand that a variety of changes, modifications, substitutions, and variations are possible in these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is limited by the appended claims and their equivalents. [Explanation of Symbols]

[0032] 1. Drag Head Mud Suction Shell 2 Top cover 3 connecting wing plates 4 Seal cover 501 Motor Frame 502 Drive motor 503 Output shaft 504 Transmission shaft 505 Driven gear 506 Drive Gear 507 Counterweight Wheel 601 Connecting tube 602 Driven transmission wheel 603 Drive transmission wheel 604 Belt 605 Connecting bearing 606 Rotating Seal 607 Side Seal Cover 701 Barrier Drum 702 1st passage hole 703 Centrifuge tube 704 Reinforcement column 705 2nd passage hole 706 Centrifugal Cavity 801 Connection Block 802 Axle 803 Laura 804 Anti-skid tires 901 Scraper Frame 902 Capture claw 1001 Sludge outlet 1002 Unidirectional plate 1003 Lead 1101 Water Tank 1102 High-pressure water pipe 12 Connection end

Claims

1. A dredging device for a drag suction dredger, comprising a drag head mud suction shell (1) and a top cover (2), wherein the top cover (2) is fixedly connected to one side of the drag head mud suction shell (1), connecting vane plates (3) are integrally provided on both sides of the top of the drag head mud suction shell (1), a seal cover (4) is fixedly connected to the top of the drag head mud suction shell (1), a drive mechanism is provided inside the seal cover (4), and the drag head mud suction A transmission mechanism is provided on both sides of the shell (1), a rolling prevention mechanism is provided between the two transmission mechanisms, a collision prevention mechanism is provided at the bottom of the drag head mud suction shell (1), a scraper mechanism is provided inside the drag head mud suction shell (1), a debris removal mechanism is provided on the upper surface of the drag head mud suction shell (1), a hydraulic shock mechanism is provided at the bottom of one side of the drag head mud suction shell (1), and a connecting end (12) is provided on one side of the drag head mud suction shell (1). The rolling prevention mechanism includes a barrier drum (701) and a first through hole (702), the barrier drum (701) being fixedly connected between two connecting cylinders (601), and the first through hole (702) being drilled through the surface of the barrier drum (701). The rolling prevention mechanism further includes a centrifugal cylinder (703), a reinforcing column (704), a second through hole (705), and a centrifugal cavity (706), wherein the centrifugal cylinder (703) is fixedly connected to the inner wall of a barrier drum (701), the reinforcing column (704) is fixedly inserted into the inner wall of the centrifugal cylinder (703) and is fixedly connected to a connecting cylinder (601), the second through hole (705) is drilled through the surface of the centrifugal cylinder (703) and the second through hole (705) and the first through hole (702) correspond to each other, and the centrifugal cavity (706) is provided penetrating the interior of the centrifugal cylinder (703) and the shape of the centrifugal cavity (706) is hourglass-shaped, characterized in that the dredging device for a drag suction dredger.

2. The drive mechanism includes a motor frame (501), a drive motor (502), an output shaft (503), a transmission shaft (504), a driven gear (505), and a drive gear (506), wherein the motor frame (501) is fixedly connected to the upper surface of the drag head mud suction shell (1), the drive motor (502) is fixedly mounted to the inner wall of the motor frame (501), and the output shaft (503) is fixed to the output end of the drive motor (502) via a coupling. A dredging device for a drag suction dredger according to claim 1, characterized in that the transmission shaft (504) is rotatably connected to the inner wall of the connecting blade plate (3), the connecting blade plate (3) is fixedly connected to the seal cover (4), the driven gear (505) is fixedly mounted on the surface of the transmission shaft (504), the drive gear (506) is fixedly mounted on the surface of the output shaft (503), and the drive gear (506) and the driven gear (505) are meshed and connected.

3. The dredging device for a drag suction dredger according to claim 2, wherein the drive mechanism further includes a counterweight wheel (507), the counterweight wheel (507) is fixedly fitted to the outer wall of the transmission shaft (504), and the shape of the counterweight wheel (507) is cylindrical.

4. The transmission mechanism includes a connecting cylinder (601), a driven transmission wheel (602), a drive transmission wheel (603), a belt (604), a connecting bearing (605), a rotating seal (606), and a side seal cover (607), wherein the connecting bearing (605) and the rotating seal (606) are both fixedly mounted on the surface of the connecting cylinder (601), there are two connecting cylinders (601), and both connecting cylinders (601) are rotatably connected to the inner walls on both sides of the drag head mud suction shell (1) via the connecting bearing (605) and the rotating seal (606), respectively, and the side seal cover - (607) is fixedly connected to both sides of the drag head mud suction shell (1), and the connecting cylinder (601) is rotatably connected to the side seal cover (607) via the connecting bearing (605) and the rotating seal (606), the driven transmission wheel (602) is fixedly attached to the outer wall of the connecting cylinder (601), the drive transmission wheel (603) is fixedly attached to the outer walls of both ends of the transmission shaft (504), and the belt (604) is installed between the driven transmission wheel (602) and the drive transmission wheel (603), characterized in that the dredging device for a drag suction dredger according to claim 2.

5. The collision prevention mechanism comprises a connecting block (801), an axle (802), rollers (803), and anti-slip tires (804), wherein the connecting block (801) is integrally provided at the bottom of the drag head mud suction shell (1), the axle (802) is rotatably connected to the inner wall of the connecting block (801), the rollers (803) are fixedly attached to both ends of the axle (802), and the anti-slip tires (804) are fixedly attached to the surface of the axle (802), characterized in that the dredging device for a drag suction dredger according to claim 1.

6. The dredging device for a drag suction dredger according to claim 4, wherein the scraper mechanism includes a scraper frame (901) and a capture claw (902), the number of scraper frames (901) is two, and both scraper frames (901) are fixedly connected to the inner wall of the drag head mud suction shell (1), the capture claw (902) is provided integrally with one side of the scraper frame (901), and the barrier drum (701) is located between the two scraper frames (901).

7. The dredging device for a drag suction dredger according to claim 1, wherein the slag discharge mechanism includes a slag discharge port (1001), a unidirectional plate (1002), and a lead (1003), the slag discharge port (1001) being opened through the upper surface of the drag head mud suction shell (1) and located on one side of the scraper frame (901), the unidirectional plate (1002) being rotatably connected to the upper surface of the drag head mud suction shell (1) and located on one side of the slag discharge port (1001), and the lead (1003) being fixedly connected to the surface of the unidirectional plate (1002) and slidably connected to the drag head mud suction shell (1).

8. The dredging device for a drag suction dredger according to claim 1, wherein the hydraulic shock mechanism includes a water tank (1101) and a high-pressure water pipe (1102), the water tank (1101) being fixedly connected to the bottom of the drag head mud suction shell (1), the high-pressure water pipe (1102) being fixedly connected to the top of the water tank (1101), a high-pressure water nozzle being provided at the bottom of the water tank (1101), and the water tank (1101) being located away from the connecting end (12) of the roller (803).

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