A grid-based precision dredging and mud collection component

Abstract

This invention discloses a gridded precision dredging and mud collection component, relating to the field of underwater dredging technology. It includes a mud collection hood with an expandable inner cavity depth, a mud pump installed inside the hood, and stirring heads symmetrically arranged relative to the mud pump. At least one one-way outlet valve is provided on the top and side walls of the mud collection hood. A mesh grid is fixedly installed at the bottom opening of the mud collection hood. The mud collection hood can be expanded in two ways: telescopic expansion and tilting expansion. By setting up the mud collection hood, the sludge is agitated and sucked in the sealed cavity, increasing the solids content, thus eliminating the need for a sedimentation tank. This allows for direct chemical conditioning and pressure filtration, avoiding the difficulties and high costs associated with sedimentation tank site selection and construction. Expanding the mud collection hood allows the entire mud collection component to adapt to different dredging depths, reducing costs. For the depth expansion of the mud collection hood, the stirring heads are driven to move up and down while rotating and agitating throughout the entire sludge depth layer, fully agitating the sludge.

Description

Technical Field

[0001] This invention relates to the field of underwater dredging technology, specifically a gridded precision dredging and mud collection component. Background Technology

[0002] In traditional underwater dredging operations, the dredging vessel's cutter head directly enters the silt at the bottom of the water to disturb the water and silt. Then, it pumps out the turbid water full of silt and sand. The silt pumped ashore enters a sedimentation tank for sedimentation treatment to increase the solid content. The clear water on top is then returned. The sedimented silt enters a conditioning tank where chemicals are added for conditioning. It is then dewatered by a filter press to form silt cake.

[0003] This method of operation requires the selection of a suitable location around the water body to build a sedimentation tank. However, in urban dredging, due to space constraints, the selection and construction of sedimentation tanks are particularly difficult, with high construction difficulty and cost, which also delays the progress of the entire dredging operation. On the other hand, direct suction in the water body causes secondary pollution, and the suction head is prone to damaging the bottom soil structure of the water body, which will also damage the aquatic ecosystem.

[0004] To address this, we divide the water body area to be dredged into a grid and perform precise dredging operations on the silt within the corresponding grid. This invention provides a grid-based precision dredging and silt collection component that matches the precision grid dredging operation method, effectively solving the problems in the aforementioned prior art. Summary of the Invention

[0005] The purpose of this invention is to provide a gridded precision dredging and mud collection component.

[0006] The technical problem solved by this invention is:

[0007] (1) How to use a mud hood to agitate and suck up the sludge in a sealed cavity, thereby increasing the solid content and eliminating the need for a sedimentation tank, thus solving the problems of difficult site selection and construction of sedimentation tanks and high costs in the existing technology;

[0008] (2) How to match the silt depth in different waters by extending the depth of the sludge collection cover, thereby solving the problem of having to replace the sludge collection cover with different specifications for different silt depths;

[0009] (3) How to solve the problem that the stirring head cannot fully agitate all the silt layers inside the hood after the hood is expanded by reciprocating lifting and lowering the stirring head inside the hood, and controlling the reciprocating lifting and lowering drive according to the expansion depth of the hood.

[0010] The present invention can be achieved through the following technical solution: a gridded precision dredging and mud collection component, including a mud collection hood with an expandable inner cavity depth, a mud pump and a stirring head symmetrically arranged relative to the mud pump installed inside the mud collection hood, at least one one-way water outlet valve opened on the top and side walls of the mud collection hood, and a mesh grid fixedly installed at the bottom opening of the mud collection hood, and the expansion method of the mud collection hood includes telescopic expansion and flip-up expansion.

[0011] A further technical improvement of the present invention is that the mesh grid is fixed to the opening of the mud hood by welding or connected to the opening of the mud hood by a detachable connection structure.

[0012] A further technical improvement of the present invention is that: the detachable connection structure includes fixing blocks fixed at the four corners of the bottom of the mud hood, and connecting blocks are installed at the corresponding positions of the four corners of the frame surrounding the outer side of the mesh grid, and the connecting blocks and the top recesses of the fixing blocks are sealed and slidably engaged.

[0013] The bottom of the connecting block is provided with a connecting cavity, and several snap-fit ​​arc grooves are evenly opened on the inner side wall of the connecting cavity. A snap-fit ​​seat is installed in the cavity, and a snap-fit ​​steel ball is floating on the outer periphery of the snap-fit ​​seat to snap-fit ​​the corresponding snap-fit ​​arc groove.

[0014] A further technical improvement of the present invention is that: the card holder is also provided with an air passage, which is composed of two channels that cross each other in a cross shape. The air passage is connected to the air outlet channel opened on the fixed block, and a one-way air valve is provided at the outlet of the air outlet channel.

[0015] A further technical improvement of the present invention is that the flip-type extension includes four extension plates hinged around the mud hood.

[0016] A further technical improvement of the present invention is that: the telescopic extension includes an extension cover, the telescopic cover is slidably and sealed in the inner wall of the mud extraction cover, and the bottom of the telescopic cover is fixedly connected to the extension cover.

[0017] A further technical improvement of the present invention is that: each stirring head is slidably mounted on the stirring shaft via a spline, and a reciprocating motion mechanism is provided parallel to one side of the stirring shaft to drive the stirring head to move up and down along the stirring shaft. The reciprocating motion mechanism is driven and controlled by a clutch structure thereon, and the clutch state of the clutch structure is controlled by the descent distance of the expansion cover.

[0018] A further technical improvement of the present invention is that: the reciprocating motion mechanism includes a reciprocating sealed housing, a reciprocating reversing screw is rotatably installed inside the reciprocating sealed housing, a reversing nut is slidably provided on the outer side of the reciprocating reversing screw, the reversing nut is synchronously raised and lowered with the stirring head through a bearing, the inner ring of the bearing is fixed to a sliding sleeve fixed to the top of the stirring head, and the outer ring of the bearing is fixed to the reversing nut.

[0019] A further technical improvement of the present invention is that: the clutch structure includes a follower clutch disc that is slidably disposed on the outside of one end of the reciprocating reversing screw extending from the reciprocating sealing housing via a spline; a transmission box is fixed on the driving device of the stirring head; the transmission box drives the driving disc at the bottom of the transmission box through gear transmission speed reduction; the driving disc and the follower clutch disc are coaxially disposed and can cooperate in a certain position to perform power transmission.

[0020] A further technical improvement of the present invention is that: an adjustable support is provided on one side of the reciprocating reversing screw, the distance between which is adjustable; a telescopic rod one and a telescopic rod two are rotatably mounted on the adjustable support; the telescopic rod one and the telescopic rod two are connected by a spline shaft and the opening angle between them is adjustable; the telescopic end of the telescopic rod one is rotatably connected to the follower clutch disc; and the telescopic end of the telescopic rod two is hinged to a drive block that is fixed to the expansion cover and slides on the side wall of the mud collection cover.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. By setting up a sludge collection hood, the sludge is agitated and sucked out within a sealed cavity, increasing the solids content and eliminating the need for a sedimentation tank. This allows for direct chemical conditioning and pressure filtration, avoiding the difficulties and high costs associated with sedimentation tank site selection and construction. This greatly simplifies the dredging process and accelerates the construction progress. On the other hand, suction within the sludge collection hood prevents secondary pollution of the surrounding water by the agitated sludge, thus protecting the ecosystem.

[0023] 2. The one-way outlet valve allows the clearer water from the upper layer to be discharged through the one-way outlet valve, further increasing the solids content inside the mud hood;

[0024] 3. The mesh grid not only uses the bottom soil plate for limiting the flow, but also prevents plastic products, textiles and other garbage from entering the mud collection hood and damaging the equipment. It also prevents vegetation growing on the soil plate from entering the mud collection hood and being damaged, further protecting the aquatic ecosystem. It is a truly environmentally friendly operation.

[0025] 4. Expanding the mud collection hood allows the entire mud collection assembly to be adapted to different dredging depths, eliminating the need to manufacture or replace mud collection hoods of different specifications, thus greatly reducing the cost of specification matching, and saving the process of replacing mud collection assemblies, saving time and effort.

[0026] 5. To extend the depth of the mud collection hood, the mixing head is driven to move up and down and rotate and stir throughout the entire silt depth layer. This ensures that when the silt thickness reaches a certain level, the silt can be sufficiently disturbed, thereby ensuring that the dredging operation within the grid can be thoroughly carried out. Attached Figure Description

[0027] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0028] Figure 1 This is a schematic diagram of the basic structural connection of the present invention;

[0029] Figure 2 This is a schematic diagram of the welded connection structure of the mesh grid of the present invention;

[0030] Figure 3 This is a schematic diagram of the detachable connection structure of the mesh grille of the present invention;

[0031] Figure 4 This is a schematic internal cross-sectional view of the detachable connection structure of the present invention;

[0032] Figure 5 This is a schematic diagram of one extension of the mud-collecting cover of the present invention;

[0033] Figure 6 This is a schematic diagram of another extension of the mud-collecting cover of the present invention;

[0034] Figure 7 For the present invention Figure 6 The diagram shows the internal connection structure of the expansion method.

[0035] Figure 8 This is a schematic diagram of the reciprocating stirring system of the present invention;

[0036] Figure 9 For the present invention Figure 8 A magnified view of a section at point A in the middle;

[0037] Figure 10 For the present invention Figure 8 A magnified view of a section at point B in the middle;

[0038] Figure 11 This is a schematic diagram of the power transmission structure connection of the present invention.

[0039] In the diagram: 1. Mud collection hood; 2. Mixing head; 3. Mud pump; 4. One-way outlet valve; 5. Mesh grid; 6. Frame; 7. Connecting block; 71. Connecting cavity; 72. Snap-fit ​​arc groove; 8. Fixing block; 9. Sealing ring; 10. Snap-fit ​​seat; 11. Air passage; 12. Snap-fit ​​steel ball; 13. One-way air valve; 14. Expansion cover; 15. Hinge; 16. Telescopic cover; 17. Hydraulic cylinder; 18. Sealing connecting rod; 19. Drive block; 20. Transmission box; 21. Small gear; 22. Large gear; 23. 1. Mounting plate; 231. Adjusting slide rail; 24. Sliding sleeve; 25. Reciprocating sealing housing; 26. Reciprocating reversing screw; 27. Reversing nut; 28. Mounting shaft; 29. ​​Steering slider; 30. Adapter bearing; 31. Sealing plate; 32. Reciprocating connecting rod; 33. Fixing ring; 34. Follow-up clutch disc; 341. Clutch hole; 35. Drive disc; 36. Transmission pin; 37. Floating contact element; 38. Roller; 39. Connecting frame; 40. Sliding seat; 41. Telescopic rod one; 42. Telescopic rod two. Detailed Implementation

[0040] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0041] Example 1

[0042] Please see Figure 1-2 As shown, a gridded precision dredging and mud collection component includes a mud collection hood 1, a mud pump 3 installed at the top of the inner cavity of the mud collection hood 1, stirring heads 2 symmetrically arranged on both sides of the mud pump 3, at least one one-way water outlet valve 4 provided at the top or side wall of the mud collection hood 1, and a mesh grid 5 welded and fixed at the bottom of the inner cavity of the mud collection hood 1. The mesh grid 5 is specifically a steel mesh with a mesh spacing of 30mm-60mm.

[0043] Preferably, the one-way outlet valve 4 is located at the top of the mud collection hood 1;

[0044] It should be noted that the shape of the mud collection cover 1 is not limited to a cube, cuboid, or cylinder. In this application, it will be uniformly described as a cuboid, and will not be repeated in subsequent embodiments.

[0045] In use, the mud collection hood 1 is lowered into the water and, under the action of gravity, comes into contact with the bottom soil section of the water body. Thus, the silt in the corresponding area above the soil section is covered in the inner cavity of the mud collection hood 1. During the process of the mud collection hood 1 covering the silt, under the action of spatial compression, the water above the silt is discharged from the inner cavity of the mud collection hood 1 through the one-way water outlet valve 4 opened on the mud collection hood 1 until the bottom of the mud collection hood 1 comes into contact with the soil section. Then, the stirring head 2 starts to rotate, stirring the silt in the mud collection hood 1, and it is then sucked out of the water surface by the mud pump 3, completing the bottom dredging operation of the water body.

[0046] The presence of the mud collection cover 1 ensures that the stirring of silt will not affect the quality of the surrounding water body, thus protecting the aquatic ecosystem.

[0047] As a large amount of water is discharged, the sludge content in the inner cavity of the sludge collection hood 1 becomes higher. This process can significantly increase the solids content of the sludge extracted later. Sludge with high solids content can directly enter the conditioning tank for chemical conditioning without the need for sedimentation treatment in the sedimentation tank. Then, it is dewatered by pressure filtration to generate mud cake, which greatly simplifies the treatment process, eliminates the trouble of finding a site in the urban area to build a sedimentation tank, greatly reduces the construction difficulty, and improves the construction efficiency.

[0048] The presence of the mesh grid 5 at the bottom of the mud collection hood 1 can prevent the mixing head 2 from touching the soil plate during agitation, thus preventing ecological damage or equipment damage. On the other hand, it can also prevent plants growing on the soil plate from entering the mud collection hood 1 and being crushed and sucked out of the water, causing ecological damage. In addition, it can also prevent plastic products, textiles and other garbage in the silt of the water from entering the mud collection hood 1 and damaging the equipment.

[0049] Example 2

[0050] Please see Figure 3-4 As shown, a frame 6 is fixedly installed on the outside of the mesh grid 5, and a connecting block 7 is fixed at the corresponding position of the four corners of the frame 6. A connecting cavity 71 is provided at the bottom of the connecting block 7. Several snap-fit ​​arc grooves 72 are evenly opened on the side wall of a certain height in the connecting cavity 71. Moreover, the bottom edge of the snap-fit ​​arc groove 72 is chamfered.

[0051] Meanwhile, a fixing block 8 is fixedly installed at the corner of the side wall of the mud hood 1. A cavity is opened at the top of the fixing block 8. A sealing ring 9 is embedded on the side wall of the cavity near the top. A snap-fit ​​seat 10 is fixedly installed at the bottom of the cavity. A number of snap-fit ​​steel balls 12 are evenly floating around the outer periphery of the snap-fit ​​seat 10 by a spring. The number of snap-fit ​​steel balls 12 is consistent with the number of snap-fit ​​arc grooves 72. An air passage 11 is also provided inside the snap-fit ​​seat 10. The air passage 11 is composed of two cross-shaped channels. The air passage 11 is connected to the air outlet channel opened on the fixing block 8. A one-way air valve 13 is provided at the outlet of the air outlet channel.

[0052] When the connecting block 7 enters the concave cavity, under the action of the sealing ring 9, the connecting block 7 and the concave cavity form a closed space. During the process of the connecting block 7 entering and compressing the closed space, the air inside is discharged through the closed space until the snap-fit ​​steel ball 12 and the corresponding snap-fit ​​arc groove 72 are engaged. At this time, the bottom of the connecting block 7 is in contact with the bottom of the concave cavity, thus completing the docking and fixing of the mesh grid 5 and the mud hood 1 under the dual action of air pressure and snap-fit ​​fixation.

[0053] This connection method is more flexible than direct welding and fixing, making it easier to clean or repair the inside of the mud hood 1, and it is also easier to replace.

[0054] Example 3

[0055] Please see Figure 5 As shown, an extension cover 14 is provided at the bottom of the mud collection cover 1. The extension cover 14 is composed of four extension plates hinged around the mud collection cover 1, and each extension plate is connected by at least a hinge 15. Fixing blocks 8 as described in Embodiment 2 are fixed near the edge of the four extension plates to connect and fix the mesh grid 5.

[0056] The purpose of adding the expansion cover 14 is to match the silt depth in different waters. When the silt depth is deep, it is necessary to expand the silt collection cover 1 by adding the expansion cover 14. In another embodiment, silt collection covers 1 of different specifications and sizes can also be customized to match the silt depth, but the cost is high and replacement is time-consuming and laborious.

[0057] Example 4

[0058] Unlike the mud collection hood 1 in Embodiment 3, which can only be extended to a fixed depth, this embodiment adopts a telescopic and adjustable depth method, which can match different silt depths at any time on the basis of one set of equipment;

[0059] like Figure 6-11 As shown, in this embodiment, the expansion cover 14 is set as a plate frame integral structure, and the mud collection cover 1 and the expansion cover 14 are connected by a telescopic cover 16. A mesh grid 5 is fixedly connected to the bottom of the telescopic cover 16. As in the first embodiment, the top or side wall of the mud collection cover 1 is provided with at least one-way water outlet valve 4, and a mud pump 3 is installed at the top of the inner cavity of the mud collection cover 1. A stirring head 2 is symmetrically arranged on both sides of the mud pump 3.

[0060] The telescopic cover 16 is also a plate frame structure and is slidably installed in the side wall of the mud collection cover 1. Hydraulic cylinders 17 are symmetrically installed on both sides of the top of the mud collection cover 1. A sealing connecting rod 18 is fixed to the output end of the hydraulic cylinder 17, and the two ends of the sealing connecting rod 18 are fixedly connected to the output end of the hydraulic cylinder 17 and the top of the telescopic cover 16, respectively. The bottom of the telescopic cover 16 is fixedly connected to the connecting groove at the top of the expansion cover 14. A drive block 19 is slidably installed on the two inner side walls of the mud collection cover 1, and the top of the drive block 19 is fixedly connected to the inner wall of the expansion cover 14.

[0061] A transmission box 20 is fixedly installed below the drive device of each stirring head 2. The stirring shaft that drives the stirring head 2 to rotate passes through the transmission box 20. A small gear 21 is fixed on the outer periphery of a section of the stirring shaft inside the transmission box 20. A large gear 22 is also rotatably installed inside the transmission box 20. The large gear 22 meshes with the small gear 21, and the transmission ratio between the large gear 22 and the small gear 21 is greater than three.

[0062] A drive disk 35 is located coaxially below the large gear 22. Several rollers 38 are evenly rotated around the outer circumference of the drive disk 35, and the rollers 38 are rolled in the bottom groove of the transmission box 20. The drive disk 35 is rotatably connected to the transmission box 20 through the rollers 38. The rotating shaft connecting the large gear 22 passes through the stirring head 2 and is fixedly connected to the center of the drive disk 35. The purpose of setting the rollers 38 is to reduce the vibration generated by contact when power is transmitted, thereby reducing the impact on gear meshing.

[0063] Multiple power transmission structures are evenly arranged on a certain circumferential position at the bottom of the drive disk 35. The power transmission structure includes a transmission pin 36 fixedly connected to the drive disk 35 and a floating contact 37 floating at the bottom of the transmission pin 36 by a spring.

[0064] A mounting plate 23 is fixed to one side of the bottom of the transmission box 20. A reciprocating sealing box 25 is fixed to the side of the mounting plate 23. A reciprocating reversing screw 26 is rotatably installed inside the reciprocating sealing box 25. A reversing nut 27 is slidably provided on the outer side of the reciprocating reversing screw 26. A reciprocating connecting rod 32 is fixed to one side of the reciprocating nut 27. A fixing ring 33 is fixed to the end of the reciprocating connecting rod 32 away from the reversing nut 27. The outer ring of the adapter bearing 30 is fixed to the inner side of the fixing ring 33. A sliding sleeve 24 is fixed to the inner ring of the adapter bearing 30. The sliding sleeve 24 is slidably connected to the stirring shaft through a spline. The bottom of the sliding sleeve 24 is fixedly connected to the stirring head 2.

[0065] Specifically, the reversing nut 27 is threadedly connected to a mounting shaft 28, and the end of the mounting shaft 28 is rotatably provided with a steering slider 29, which is slidably connected to the reciprocating reversing screw 26 through a reciprocating groove.

[0066] Specifically, a clearance groove is provided on the side wall of the reciprocating sealing box 25 near the sliding sleeve 24, and the reciprocating connecting rod 32 slides in the clearance groove. The clearance groove is also provided with a sealing plate 31 that seals the inner cavity of the reciprocating sealing box 25. The sealing plate 31 is fixed through the reciprocating sealing box 25 and slides synchronously with the reciprocating sealing box 25.

[0067] The upper end of the reciprocating reversing screw 26 passes through the reciprocating sealed housing 25, and its end is slidably connected to a follower clutch disc 34 via a spline. Several clutch holes 341 are provided at a certain circumference of the follower clutch disc 34, the number of which is at least twice the number of the transmission pins 36. A connecting bracket 39 is fixed to the outer bottom of the follower clutch disc 34, and a sliding seat 40 is fixed to the end of the connecting bracket 39. The sliding seat 40 slides on the surface of the mounting plate 23, and an adjusting groove 231 is horizontally provided on the side wall of the mounting plate 23. The adjustable sliding support has an adjustable support on which telescopic rod 41 and telescopic rod 42 are rotatably mounted. The telescopic rod 41 and telescopic rod 42 are connected by a spline shaft and the opening angle between them is adjustable. The telescopic end of telescopic rod 41 is hinged to the sliding seat 40, and the telescopic end of telescopic rod 42 is hinged to the drive block 19. The position of the adjustable support in adjusting the slide groove 231 can determine the transmission ratio between telescopic rod 41 and telescopic rod 42, thereby adjusting the sliding distance of the sliding seat 40 when the drive block 19 slides a certain distance.

[0068] When in use, when the silt depth exceeds the combined depth of the silt collection hood 1 and the expansion hood 14, the hydraulic cylinder 17 is activated, which drives the telescopic hood 16 to slide inside the side wall of the silt collection hood 1 and disengage the silt collection hood 1 and the expansion hood 14. The expansion hood 14 and the telescopic hood 16 descend synchronously, thereby driving the drive block 19 to descend as well, causing the second telescopic rod 42 to rotate, which in turn drives the first telescopic rod 41 to rotate in the opposite direction, causing the sliding seat 40 to slide upward. The follow-up clutch disc 34 and the drive disc 35 approach each other. If the transmission pin 36 has not yet entered the corresponding clutch hole 341, the expansion hood 14 stops descending, indicating that at this time most of the silt entering the silt collection hood 1 can be fully disturbed by the stirring head 2.

[0069] As the expansion cover 14 continues to descend to a certain position, only the upper layer of silt at the corresponding depth inside the mud collection assembly can be disturbed by the stirring head 2. At this time, the transmission pin 36 enters the corresponding clutch hole 341. The rotation of the stirring shaft and the gear transmission can drive the drive disc 35 to rotate, which in turn drives the follower clutch disc 34 to rotate. The reciprocating reversing screw 26, which is splinedly connected to the follower clutch disc 34, rotates accordingly, thereby causing the reversing nut 27 to move up and down reciprocally, which in turn drives the sliding sleeve 24 to move up and down. This allows the stirring head 2 to move up and down together with the sliding sleeve 24 while rotating and disturbing, thus fully disturbing the entire silt depth layer inside the mud collection assembly, which is convenient for the subsequent extraction operation of the mud pump 3.

[0070] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A grid-based precision dredging and mud-collecting component, characterized in that, The mud collection hood (1) includes an expandable inner cavity depth. A mud pump (3) and a stirring head (2) symmetrically arranged relative to the mud pump (3) are installed inside the mud collection hood (1). At least one one-way water outlet valve (4) is provided on the top and side walls of the mud collection hood (1). A mesh grid (5) is fixedly installed at the bottom opening of the mud collection hood. The expansion method of the mud collection hood (1) includes telescopic expansion and flip-type expansion. The telescopic extension includes an extension cover (14), and a telescopic cover (16) is slidably and sealed in the inner wall of the mud collection cover (1), and the bottom of the telescopic cover (16) is fixedly connected to the extension cover (14). Each of the stirring heads (2) is slidably mounted on the stirring shaft via a spline. A reciprocating motion mechanism is provided parallel to one side of the stirring shaft to drive the stirring head (2) to move up and down along the stirring shaft. The reciprocating motion mechanism is driven and controlled by a clutch structure on it. The clutch state of the clutch structure is controlled by the descent distance of the expansion cover (14). The reciprocating motion mechanism includes a reciprocating sealed housing (25), in which a reciprocating reversing screw (26) is rotatably installed. A reversing nut (27) is slidably provided on the outside of the reciprocating reversing screw (26). The reversing nut (27) is connected to the stirring head (2) in a synchronous lifting and lowering manner through a bearing. The inner ring of the bearing is fixed to the sliding sleeve (24) fixed on the top of the stirring head (2), and the outer ring of the bearing is fixed to the reversing nut. The clutch structure includes a follower clutch disc (34) that is slidably mounted on the outside of one end of the reciprocating reversing screw (26) extending out of the reciprocating sealed housing (25) via a spline. A transmission box (20) is fixed on the drive device of the stirring head (2). The transmission box (20) drives the drive disc (35) at the bottom of the transmission box (20) through gear transmission speed reduction. The drive disc (35) and the follower clutch disc are coaxially mounted and can cooperate in a certain position to perform power transmission.

2. The grid-based precision dredging and mud-collecting component according to claim 1, characterized in that, The mesh grid (5) is fixed to the opening of the mud hood (1) by welding or connected to the opening of the mud hood (1) by a detachable connection structure.

3. The grid-based precision dredging and mud-collecting component according to claim 2, characterized in that, The detachable connection structure includes fixing blocks (8) fixed at the four corners of the bottom of the mud hood (1), and connecting blocks (7) installed at the corresponding positions of the four corners of the frame (6) surrounding the outside of the mesh grid (5). The connecting blocks (7) and the top cavity of the fixing blocks (8) are sealed and slidably engaged. The bottom of the connecting block (7) is provided with a connecting cavity (71), and a number of snap-fit ​​arc grooves (72) are evenly opened on the inner side wall of the connecting cavity (71). A snap-fit ​​seat (10) is installed in the cavity, and a snap-fit ​​steel ball (12) is floatingly provided on the outer periphery of the snap-fit ​​seat (10) to match the snap-fit ​​arc groove (72) one by one.

4. The grid-based precision dredging and mud-collecting component according to claim 3, characterized in that, The card holder (10) is also provided with an air passage (11), which is composed of two channels that cross each other. The air passage (11) is connected to the air outlet channel opened on the fixed block (8), and a one-way air valve (13) is provided at the outlet of the air outlet channel.

5. The grid-based precision dredging and mud-collecting component according to claim 1, characterized in that, The flip-type extension includes four extension plates hinged around the mud hood (1).

6. The grid-based precision dredging and mud-collecting component according to claim 1, characterized in that, One side of the reciprocating reversing screw (26) is provided with an adjustable support that is adjustable at a distance from it. The adjustable support is rotatably provided with a first telescopic rod (41) and a second telescopic rod (42). The first telescopic rod (41) and the second telescopic rod (42) are connected by a spline shaft and the opening angle between them is adjustable. The telescopic end of the first telescopic rod (41) is rotatably connected to the follower clutch disc (34). The telescopic end of the second telescopic rod (42) is hinged to the drive block (19) that is fixed to the expansion cover (14) and slides on the side wall of the mud hood (1).

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