Dredger rake head for excavating clay

Abstract

The invention discloses a dredger rake head for excavating clay, and belongs to the technical field of dredging engineering. The rake comprises a movable cover, rake teeth and a grid, wherein the movable cover is of a cavity structure with an opening; the rake teeth are arranged at the front end of the movable cover and located in the cavity structure of the movable cover, and the rake teeth are used for conducting construction on a dredging working face; the grating is detachably connected with the inner wall of the movable cover, a flushing assembly opposite to the grating is arranged in the movable cover and comprises two rows of first flushing units and second flushing units parallel to the rake teeth, each first flushing unit comprises a plurality of first nozzles arranged at equal intervals, and each second flushing unit comprises a plurality of second nozzles arranged at equal intervals; the first nozzles and the second nozzles are arranged in a staggered mode, and liquid flows sprayed by the first nozzles and the second nozzles jointly act on the bonding substances in the movable cover body. The low-pressure area of disturbance injection can be filled, and the risk of rake blockage is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of dredging engineering, in particular to a dredging ship rake head for dredging clay. Background Art

[0002] In the dredging industry, a trailing suction hopper dredger is a large self-propelled, cabin-type dredger equipped with a dragline excavator and a hydraulic dredging device.

[0003] The trailing suction hopper dredger adopts the method of dredging while moving during dredging operations, and integrates multiple functions of dredging, loading and unloading. It is self-propelled, does not require the assistance of other ships, and will not affect the navigation of other surrounding ships. The trailing suction hopper dredger adopts the method of dredging while moving during the dredging process, and has a high dredging efficiency. The trailing suction hopper dredger equipped with mud pumps and mud discharge pipelines can also carry out filling operations to blow mud onto land.

[0004] Trailing suction dredgers use the drag head to dredge the loose underwater mud, and use the mud pump to suck the mud and transport it to the cabin. When the drag head is dredging the clay layer, the clay particles have strong cohesion and water holding capacity, and their adhesion to the rake teeth and flow channels is strong. When the drag head is dredging the clay, it is easy to form blockage and agglomeration, which seriously affects the construction efficiency. Summary of the invention

[0005] In view of this, it is necessary to provide a dredger rake head for digging clay, so as to solve the problem that the existing rake head is prone to blockage and agglomeration when digging clay.

[0006] The present invention provides a dredging ship rake head for excavating clay, comprising a movable cover, rake teeth and a grille, wherein the movable cover is a cavity structure with an opening; the rake teeth are arranged at the front end of the movable cover and located in the cavity structure of the movable cover, and the rake teeth are used to construct a dredging working surface; the grille is detachably connected to the inner wall of the movable cover, a flushing assembly arranged relative to the grille is arranged in the movable cover, the flushing assembly comprises two rows of first flushing units and second flushing units arranged parallel to the rake teeth, the first flushing unit comprises a plurality of first nozzles arranged equidistantly, the second flushing unit comprises a plurality of second nozzles arranged equidistantly, the first nozzle and the second nozzle are arranged in an alternating manner, and the liquid flows sprayed by the first nozzle and the second nozzle act together on the adhesive in the movable cover body to fill the low-pressure area of ​​the disturbance spraying.

[0007] Furthermore, the distance between two adjacent first nozzles is equal to the distance between two adjacent second nozzles, and the distance between two adjacent first nozzles is equal to the distance between adjacent rake teeth.

[0008] Furthermore, the number of the rake teeth is 20, and the distance between the rake teeth is 180 mm.

[0009] Furthermore, there are 20 first nozzles, and 18 second nozzles, and one second nozzle is disposed between two first nozzles.

[0010] Furthermore, the distance between the first flushing unit and the second flushing unit is 95 mm-135 mm.

[0011] Furthermore, the movable cover has an angle of 0° to the ground, the grille is connected to the inlet of the movable cover, the grille has an angle of 0°-60° to the ground, and the flushing assembly has an angle of 0°-30° with a reference line of the movable cover.

[0012] Furthermore, the hole spacing of the grille is 284mm×333mm.

[0013] Furthermore, it also includes a cutting assembly, which includes a plurality of blades. The blades are fixedly connected to the bottom of the movable cover, and the blades can cut into the clay layer to prevent the side movement of the rake head.

[0014] Furthermore, a reinforcing rib plate is provided between adjacent blades, one side of the reinforcing rib plate is fixedly connected to the movable cover, and both ends of the reinforcing rib plate are respectively connected to two adjacent blades.

[0015] Furthermore, it also includes an infusion system, which includes a multi-way bifurcated tube and a butterfly valve, one end of the multi-way bifurcated tube is connected to the water inlet pipeline, the second end of the multi-way bifurcated tube is connected to the flushing component, the third end of the multi-way bifurcated tube is connected to the wear-resistant block high-pressure flushing system, and the butterfly valve is arranged on the third end of the multi-way bifurcated tube.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention discloses a dredging ship rake head for excavating clay, wherein a flushing assembly arranged relative to the grille is provided in a movable cover, and the flushing assembly can effectively clear the clay adhesive that blocks the grille. The flushing assembly includes two rows of first flushing units and second flushing units arranged in parallel to the rake teeth, the first flushing unit includes a plurality of first nozzles arranged at equal intervals, the second flushing unit includes a plurality of second nozzles arranged at equal intervals, and the first nozzles and the second nozzles are arranged in a staggered manner so that the sprayed water flow can cover a larger area. The staggered liquid flow can more evenly impact the clay particles adhered to the inner wall of the movable cover and the rake teeth, avoid local liquid flow dead angles, and reduce the accumulation of adhesives. The low-pressure area generated between two adjacent first nozzles can be filled by the second nozzle located between the two first nozzles, and the jet sprayed from the second nozzle can disturb the low-pressure area, expand the disturbance range, enhance the impact effect on the mud block, dredge the rake head, and reduce the risk of rake blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 The overall structure of the present invention is shown in FIG. Figure 1 ;

[0020] Figure 2 The overall structure of the present invention is shown in FIG. Figure 2 ;

[0021] Figure 3 It is a structural schematic diagram of the flushing assembly in the present invention;

[0022] Figure 4 The overall structure of the present invention is shown in FIG. Figure 3 ;

[0023] Figure 5 It is a structural schematic diagram of the infusion system of the present invention;

[0024] Figure 6 It is a schematic diagram of the structure of the model and grid division of the double-row nozzles in the present invention;

[0025] Figure 7 yes Figure 6 Bottom surface pressure contour of the middle model;

[0026] Figure 8 yes Figure 6 Nozzle pressure curve of the model in the middle;

[0027] Fig. 9 It is the velocity cloud diagram of the rake head model with different grille angles;

[0028] Fig.10 This is the clay concentration cloud map of the rake head model with different grille angles

[0029] Fig.11 It is the concentration cloud diagram of the model with different nozzle angles;

[0030] Fig.12 It is the velocity field cloud diagram of the model with different nozzle angles.

[0031] In the figure, 100, a movable cover;

[0032] 200, rake teeth;

[0033] 300, grille;

[0034] 400, flushing assembly; 410, first flushing unit; 411, first nozzle; 420, second flushing unit; 421, second nozzle;

[0035] 500, cutting assembly; 510, blade; 520, reinforcing rib plate;

[0036] 600. Infusion system; 610. Multi-way bifurcated tube; 620. Butterfly valve. DETAILED DESCRIPTION

[0037] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0038] A dredging ship drag head for dredging clay in this embodiment relates to the technical field of dredging engineering. The arrangement of the nozzles arranged relative to the grid 300 is adjusted, and the original single-row structure is changed to a cross double-row structure. The coverage area of ​​the nozzle jets in the movable cover 100 is increased, and the nozzle jets promote the transportation of the dredged mixture that has passed through the grid 300 in the drag head fixed body, which is beneficial to the transportation of the clay mixture and reduces the risk of clay sticking in the drag head.

[0039] See also Figures 1 to 5 In this embodiment, a dredger rake head for digging clay is provided. As the existing technical content, the rake head includes a movable cover 100, rake teeth 200 and a grille 300. The movable cover 100 is a cavity structure with an opening. The rake teeth 200 are arranged at the front end of the movable cover 100 and are located in the cavity structure of the movable cover 100. The rake teeth 200 are used to construct the dredging working surface. The main function of the grille 300 is to filter large debris or stones to ensure that only mud and sand can enter the mud system smoothly without blocking the pump port or pipeline. The grille 300 is detachably connected to the inner wall of the movable cover 100 and can be replaced or repaired when damaged.

[0040] In this embodiment, a dredger rake head for dredging clay is provided with a flushing assembly 400 arranged relative to the grille 300 in the movable cover 100, and the flushing assembly 400 can effectively clear the clay adhesives blocking the grille 300. The flushing assembly 400 includes two rows of first flushing units 410 and second flushing units 420 arranged parallel to the rake teeth 200, the first flushing unit 410 includes a plurality of first nozzles 411 arranged at equal intervals, and the second flushing unit 420 includes a plurality of second nozzles 421 arranged at equal intervals, and the first nozzles 411 and the second nozzles 421 are arranged in an interlaced manner so that the sprayed water flow can cover a larger area. The interlaced liquid flow can more evenly impact the clay particles adhered to the inner wall of the movable cover 100 and the rake teeth 200, avoid local liquid flow dead angles, and reduce the accumulation of adhesives.

[0041] It should be noted that the impact of the single-row nozzles on the external flow field is linear, there is a strong reflux effect between adjacent nozzles, the pressure between nozzles is low, and some mud will gather in the middle. Due to the single arrangement of the nozzles, the jets generated by different nozzles cannot complement each other, and the disturbance range of the single-row nozzles in the external flow field is narrow. In areas where the jet disturbance does not work or the effect is weak, the impact effect on the mud is poor, which is prone to blockage.

[0042] When a double-row flushing unit is used, the low-pressure area generated between two adjacent first nozzles 411 can be filled by the second nozzle 421 located between the two first nozzles 411. The jet ejected from the second nozzle 421 can disturb the low-pressure area, expand the disturbance range, enhance the impact effect on the mud blocks, dredge the rake head, and reduce the risk of rake blockage.

[0043] In some embodiments, see Figure 2 and Figure 3 , the distance between two adjacent first nozzles 411 is equal to the distance between two adjacent second nozzles 421, and the distance between two adjacent first nozzles 411 is equal to the distance between adjacent rake teeth 200. The equal distance between adjacent nozzles in the same row can ensure the uniform distribution of the liquid flow, and all nozzles can act on the same area of ​​adhesive at the same time, reducing the situation where the local liquid flow is too strong or too weak, thereby effectively removing the attached clay particles. At the same time, the uniform arrangement of the nozzles can cover the working surface more comprehensively, reduce potential dead corners of liquid flow, and ensure that all areas can be fully flushed.

[0044] The distance between the nozzles is consistent with the spacing between the rake teeth 200. The first nozzle 411 is set relative to the rake teeth 200, and the second nozzle 421 is set relative to the gap between the rake teeth 200, so that the sprayed liquid flow can effectively impact the rake teeth 200 and penetrate the gap between the rake teeth 200 after passing through the grille 300, thereby reducing the adhesion of the soil and improving the flushing efficiency.

[0045] In some embodiments, see Figure 3 , considering that clay easily adheres between the teeth 200, in order to reduce the adhesion of clay on the teeth 200 and reduce the excavation resistance, the number of existing teeth 200 is reduced from 24 to 20. The number of teeth 200 is appropriately reduced, and the pores between the teeth are increased to prevent large pieces of clay from entering the grille 300 and blocking it. On the premise that the overall size of the rake head remains unchanged, the distance between the teeth 200 is proportionally increased to 180 mm. Compared with the existing rake tooth 200 structure, the number of teeth 200 is reduced, and the spacing between the teeth 200 is reduced, making it easier for mud and soil to flow, reducing the risk of blockage caused by soil accumulation. Compared with densely arranged rake teeth 200, larger spacing can reduce the retention of soil between the teeth 200 and reduce the probability of blockage.

[0046] In some embodiments, the distance between the first flush unit 410 and the second flush unit 420 is 95 mm-135 mm.

[0047] The row spacing of the nozzles needs to be determined according to the simulation results of different models, so a double-row model of nozzles is established for the following numerical analysis:

[0048] Working conditions 1 2 3 4 Nozzle row distance L / mm 95 115 125 135

[0049] There are 20 first nozzles 411 and 18 second nozzles 421, and a second nozzle 421 is provided between the two first nozzles 411. The first nozzles 411 and the second nozzles 421 complement each other to form a more balanced water flow impact force, and quickly discharge the mud and adhesions from the rake head, thereby avoiding blockage or agglomeration problems.

[0050] The arrangement is periodic, and all calculations not only lead to slow calculations, but also waste computing resources. Therefore, the simplified model is 3 in the first row and 4 in the second row. This not only can reasonably analyze the impact pressure and velocity when the nozzles are arranged in two rows, but also greatly improves the calculation efficiency. The model and grid division are as follows: Figure 6 shown.

[0051] The boundary conditions for the double-row nozzle simulation are the same as those for the single-row nozzle, and the specific list is as follows:

[0052]

[0053] Simulation analysis is performed on the above-mentioned models, and the bottom surface pressure cloud diagram is captured, such as Figure 7 As shown:

[0054] Analysis of the pressure cloud diagram of the double-row nozzle shows that when the row spacing is L=125mm and L=135mm, the impact pressure on the target surface is small due to the large row spacing, the pressure core is more dispersed, and the impact effect is poor. When the row spacing is L=95mm and L=115mm, the pressure core distribution is reasonable, the core is obvious, and the impact effect on the target surface is better.

[0055] like Figure 8 As shown in the figure, the pressure values ​​of two rows of nozzles on the midline of the target surface are selected, and two pressure curves on the target surface are drawn in the same coordinate system. When the nozzle row spacing is smaller, the pressure value corresponding to the intersection of the two pressure curves is higher, indicating that the minimum impact pressure of the nozzle combination on the target surface is greater, and at the same time, the interference of each high-pressure water jet and the interference of the return flow on the target surface will also be strengthened. Considering that when the row spacing is 95mm, the spacing between the two rows of nozzles is too small, which will affect the strength of the connection part with the nozzle, the preferred row spacing is 115mm.

[0056] It should be noted that when the row spacing between the first flush unit 410 and the second flush unit 420 is less than 95 mm, the spacing between the two rows of nozzles is too small, which directly affects the strength of the connection parts with the nozzles. When the row spacing is greater than 135 mm, the spacing between the two rows of nozzles is too large, and they cannot cooperate with each other to disturb the low-pressure area.

[0057] By studying the pressure cloud diagram of the double-row nozzles, we can know that the double-row nozzles have a wider range of action on the external flow field and a greater impact pressure. The area between adjacent nozzles in the same row can be supplemented by the jets of the other row of nozzles, the backflow effect in the external flow field is weakened, the jet action range is expanded, and the impact on the mud blocks is enhanced.

[0058] In some embodiments, see Figure 3 The angle of the movable cover 100 to the ground is 0°, the grille 300 is connected to the inlet of the movable cover 100, the angle of the grille 300 to the ground is 20°, and the angle between the flushing assembly 400 and the reference line of the movable cover 100 is 0°-30°.

[0059] The existing grid 300 is generally installed at the suction port of the fixed body of the rake head. When the clay dredged material cut and excavated by the rake teeth 200 reaches the grid 300, due to the large amount of accumulated clay, the grid 300 is difficult to cut the large pieces of clay, and there is a considerable risk of rake blockage. The grid 300 is rotated forward and moved to the suction port of the movable cover 100. When the angle of the movable cover 100 to the ground is 0°, the angle of the grid 300 to the ground is 0°-60°. The original grid 300 hole spacing is 280mm×320mm, which is changed to 284mm×333mm. The rake head uses the grid 300 to cut the clay before it enters the inner cavity of the movable cover 100, which avoids the whole piece of clay from moving in the movable cover 100, increases the suction effect of the clay, and thus reduces the risk of rake blockage.

[0060] When the angle of the drag head to the ground is 50°, the flow field when the drag head rotates forward by 20°, 40°, and 60° is simulated and analyzed, taking the verticality between the drag head and the drag wall as the 0° reference.

[0061] The boundary conditions for the numerical simulation of the grid 300 angle adjustment are listed as follows:

[0062] No. Angle to ground / ° Inlet velocity / (m·s-1) Inlet concentration / % Grid 300 angle / ° Nozzle inlet flow / (m3·s-1) Drag head outlet pressure / Pa

[0063]

[0064] Keep the drag head at 50° and the movable cover 100 at 0°. Fig. 9 , a velocity cloud diagram is made for the rake head model with different grille 300 angles.

[0065] analyze Fig. 9 From the velocity cloud diagrams of different grille angles at 300 degrees, we can find that:

[0066] (1) There is always a strong vortex at the entrance of the fixed body of the drag head, resulting in a low-speed area at the entrance of the fixed body. The forward movement of the grille 300 can reduce the low-speed area;

[0067] (2) When the angle is 40°, the high-pressure water impact direction of the movable cover 100 faces the fixed rod of the grille 300, which is not conducive to the transportation of clay in the rake head.

[0068] See also Fig.10 , a clay concentration cloud map was made for the rake head model with different grid 300 angles.

[0069] from Fig.10 The clay concentration cloud map of the middle grid 300 forwards shows that:

[0070] (1) There is a high concentration area at the entrance of the drag head fixed body, and its formation may be related to the vortex at the entrance of the movable cover 100 and the fixed body;

[0071] (2) As the angle of the grid 300 moves to 20°, the concentration in the high-concentration area at the entrance of the fixed body decreases, and the concentration distribution in the rake head becomes more uniform, which is conducive to the transportation of clay;

[0072] (3) There is always a small area of ​​high concentration near the fixed rods of the grid 300 because the fixed rods hinder the transportation of clay and it is unavoidable.

[0073] In summary, the angle of the grille 300 to the ground is preferably 20°.

[0074] In some embodiments, the angle between the flush assembly 400 and the reference line of the movable cover 100 is 0°-30°.

[0075] The high-pressure water jet on the movable cover 100 plays a very important role in the transportation of large pieces of clay entering the rake head. Reasonable definition of the angle of the nozzle of the movable cover 100 is conducive to improving the transportation effect of high-pressure water jet on clay. The rake head maintains an angle of 50° to the ground, the movable cover 100 maintains an angle of 0° to the ground, and the grille 300 maintains its original state. The angle between the nozzle on the movable cover 100 and the reference line of the movable cover 100 is 0° as the reference model. The flow field changes when the angle between the nozzle and the reference line of the movable cover 100 is 10°, 20°, and 30° are studied respectively. The impact force of the jet increases the ability of clay to pass through the grille. The specific boundary conditions for calculation are listed as follows:

[0076] No. Rake head angle to ground / °Inlet velocity / (m·s-1)Inlet concentration / %Nozzle angle / °Nozzle inlet pressure / PaRake head outlet pressure / Pa

[0077]

[0078] like Fig.11 As shown, numerical simulation calculations were performed on the models of 4 groups with different nozzle angles to obtain concentration cloud maps.

[0079] By comparing and analyzing the concentration field cloud maps at different nozzle angles, it can be found that the concentration cloud maps are quite different at different nozzle angles. When the nozzle angle is 0°, the concentration in the movable cover 100 is relatively high and concentrated on both sides of the movable cover 100; when the nozzle angle is 10°, the high concentration area in the movable cover 100 is significantly reduced compared with other angles; when the nozzle angle is 20° and 30°, a large amount of clay is deposited in the movable cover 100, which can easily cause blockage of the rake.

[0080] like Fig.12 As shown, numerical simulation calculations were performed on four groups of models with different nozzle angles to obtain velocity field cloud maps.

[0081] By comparing and analyzing the velocity field cloud diagrams at different nozzle angles, we can find that:

[0082] (1) Under different nozzle angles, the position where the high-pressure water of the movable hood 100 impacts the grille 300 is different, and there is a certain degree of offset along the jet direction. As the nozzle angle increases, the position of the high-pressure water impacts downward. When the nozzle angle is 0°, the high-pressure water impacts the fixed axis in the middle of the grille 300; when the nozzle angle is 10°, the high-pressure water impacts the lower half of the grille 300; when the nozzle angle is 20° and 30°, the high-pressure water impacts the lower half of the grille 300, but the velocity attenuation increases and the clay cannot be effectively impacted, resulting in a higher clay concentration accumulated in the movable hood 100;

[0083] (2) When the nozzle angle is 0°, the high-pressure water flushing coverage position is biased upward, and the large piece of clay at the bottom of the rake head cannot be flushed; as the nozzle angle increases, the high-pressure water flushing coverage position gradually shifts downward, which can better achieve the flushing effect on the clay; when the nozzle angle is 10°, the impact angle of the high-pressure water flushing is directly facing the lower half of the grid 300 where clay is easily adhered, which is conducive to the transportation of clay.

[0084] In summary, the included angle between the first flushing unit 410 and the second flushing unit 420 and the reference line of the movable cover 100 is 10°.

[0085] It should be noted that the rake head is generally used at an angle of 50° to the ground.

[0086] In some embodiments, see Figure 2 and Figure 4 A dredging ship rake head for dredging clay further includes a cutting assembly 500, which includes a plurality of blades 510. The blades 510 are fixedly connected to the bottom of the movable cover 100. The blades 510 can cut into the clay layer to prevent the rake head from moving sideways.

[0087] In the specific implementation process, three blades 510 are provided, and the blades 510 can increase the lateral action area, play a positioning role, eliminate the sliding rake phenomenon, and pre-cut the clay to improve the soil breaking ability. A reinforcing rib plate 520 is provided between the three blades 510, one side of the reinforcing rib plate 520 is fixedly connected to the movable cover 100, and the two ends of the reinforcing rib plate 520 are respectively connected to two adjacent blades 510. The reinforcing rib plate 520 can prevent the blade 510 from deforming and improve the structural strength.

[0088] In some embodiments, see Figure 4 and Figure 5 A dredging ship rake head for digging clay also includes a liquid infusion system 600, which can provide high-pressure water to the wear-resistant block high-pressure flushing system and the flushing assembly 400. The liquid infusion system 600 includes a multi-way bifurcated pipe 610 and a butterfly valve 620. The first end of the multi-way bifurcated pipe 610 is connected to the water inlet pipeline, and the water inlet pipeline can deliver high-pressure water to the multi-way bifurcated pipe 610 under the action of a high-pressure water pump. The second end of the multi-way bifurcated pipe 610 is connected to the flushing assembly 400, and the third end of the multi-way bifurcated pipe 610 is connected to the wear-resistant block high-pressure flushing system. The butterfly valve 620 is arranged on the third end of the multi-way bifurcated pipe 610, and the third end is bent relative to the upper side, which can facilitate the installation of the butterfly valve 620.

[0089] During use, when digging a clay layer, the high-pressure flushing of the wear-resistant block has little effect on the clay and cannot play a pre-cutting role. The butterfly valve 620 is closed, and all high-pressure water is supplied to the flushing assembly 400 to improve the cleaning efficiency of the adhesive. When digging other sandy soils, the high-pressure flushing on the wear-resistant block is turned on to reasonably regulate the energy consumption of the ship and improve the construction efficiency.

[0090] During the specific implementation process, two interfaces are provided at the second end of the multi-way bifurcated tube 610, and the two interfaces can be connected to the flushing assembly 400 through pipes respectively to provide high-pressure water flow to the first nozzle 411 and the second nozzle 421. The two interfaces can work independently, thereby improving the fault tolerance of the system and ensuring the working stability of the system.

[0091] 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 changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed in the present invention should be covered by the present invention.

Claims

1. A dredging ship rake head for digging clay, comprising a movable cover, rake teeth and a grille, wherein the movable cover is a cavity structure with an opening; the rake teeth are arranged at the front end of the movable cover and are located in the cavity structure of the movable cover, and the rake teeth are used to construct a dredging working surface; the grille is detachably connected to the inner wall of the movable cover, characterized in that: A flushing assembly is provided in the movable cover and is arranged relative to the grille. The flushing assembly includes two rows of first flushing units and second flushing units arranged parallel to the rake teeth. The first flushing unit includes a plurality of first nozzles arranged equidistantly, and the second flushing unit includes a plurality of second nozzles arranged equidistantly. The first nozzles and the second nozzles are arranged alternately, and the liquid flows sprayed by the first nozzles and the second nozzles act together on the adhesive in the movable cover body to fill the low-pressure area of ​​the disturbed spraying.

2. A dredging ship drag head for dredging clay according to claim 1, characterized in that: The distance between two adjacent first nozzles is equal to the distance between two adjacent second nozzles, and the distance between two adjacent first nozzles is equal to the distance between adjacent rake teeth.

3. A dredging ship drag head for dredging clay according to claim 2, characterized in that: The number of the rake teeth is 20, and the distance between the rake teeth is 180 mm.

4. A dredging ship drag head for dredging clay according to claim 3, characterized in that: There are 20 first nozzles and 18 second nozzles, and one second nozzle is arranged between two first nozzles.

5. A dredging ship drag head for dredging clay according to claim 2 or 3, characterized in that: The distance between the first flushing unit and the second flushing unit is 95mm-135mm.

6. A dredging ship drag head for dredging clay according to claim 1, characterized in that: The movable cover has an angle of 0° to the ground, the grille is connected to the inlet of the movable cover, the grille has an angle of 0°-60° to the ground, and the flushing assembly has an angle of 0°-30° to the reference line of the movable cover.

7. A dredging ship drag head for dredging clay according to claim 6, characterized in that: The hole spacing of the grille is 284mm×333mm.

8. A dredging ship drag head for dredging clay according to claim 1, characterized in that: The utility model also comprises a cutting assembly, wherein the cutting assembly comprises a plurality of blades, the blades are fixedly connected to the bottom of the movable cover, and the blades can cut into the clay layer to prevent the lateral movement of the drag head.

9. A dredging ship drag head for dredging clay according to claim 8, characterized in that: A reinforcing rib plate is provided between adjacent blades, one side of the reinforcing rib plate is fixedly connected to the movable cover, and both ends of the reinforcing rib plate are respectively connected to two adjacent blades.

10. A dredging ship drag head for dredging clay according to claim 1, characterized in that: It also includes an infusion system, which includes a multi-way bifurcated tube and a butterfly valve. One end of the multi-way bifurcated tube is connected to the water inlet pipeline, the second end of the multi-way bifurcated tube is connected to the flushing component, and the third end of the multi-way bifurcated tube is connected to the wear-resistant block high-pressure flushing system. The butterfly valve is arranged on the third end of the multi-way bifurcated tube.

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