A dredging device machine for inland river pollution treatment and a method of using the same

Abstract

The application relates to the technical field of dredging, in particular to a dredging device for inland river pollution treatment and a use method thereof, which comprises a floating boat and two groups of negative pressure suction mechanisms arranged on the floating boat. The negative pressure suction mechanism comprises: a suction structure arranged on the floating boat, the end of the suction structure is provided with a suction head immersed in water, a plurality of groups of screen holes are circumferentially and equidistantly arranged on the suction head; a covering dredging structure is arranged in the suction head, two independent chambers are formed in the covering dredging structure, and the two independent chambers can shield local screen holes; a pump pressure channel is connected with the covering dredging structure at one end and connected with an air compressor arranged on the floating boat at the other end, and the pump pressure channel is in communication with the two chambers respectively; and a switching assembly is connected with the pump pressure channel and the air compressor, when the covering dredging structure rotates, the switching assembly can make the pump pressure channel sequentially communicate with the two groups of chambers, and the screen hole filtering property is improved.

Description

Technical Field

[0001] This invention relates to the field of dredging technology, specifically to a dredging device and its usage method for inland river pollution control. Background Technology

[0002] In the treatment of inland river pollution, dredging equipment is a key device for removing riverbed sediment and reducing endogenous pollution. In order to protect core components such as negative pressure suction devices from damage, it is usually necessary to install a filter device on the suction pipeline to intercept large-particle impurities such as stones and plant debris in the silt. To address the problem of clogging of the filter device, existing technologies mostly use backflushing to clean it.

[0003] However, in practical engineering applications, it has been found that not all screen holes are blocked by impurities during the filtration process. This causes the backwash gas to preferentially pass through the unobstructed screen holes during backwashing, creating a pressure relief effect. Consequently, the backwash pressure cannot be effectively concentrated on the truly blocked screen holes, resulting in insufficient actual backwash pressure on the blocked screen holes. This makes it difficult to effectively remove stubborn impurities embedded in the screen holes or attached to the filter screen surface. Over time, the effective filtration area of ​​the filtration device continues to decrease, and the suction resistance increases. Summary of the Invention

[0004] The purpose of this invention is to provide a dredging device and its usage method for inland river pollution control, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A dredging device for inland river pollution control includes a floating hull and two sets of negative pressure suction mechanisms mounted on the hull.

[0007] The negative pressure suction mechanism includes:

[0008] A suction structure is installed on the floating vessel. The end of the suction structure is provided with a suction head that is submerged in water. The suction head is provided with multiple sets of screen holes equidistantly arranged in a circle.

[0009] A covering and unblocking structure is provided inside the suction head, and two independent chambers are formed within the covering and unblocking structure. These two independent chambers can block some of the sieve holes.

[0010] The pump pressure channel is connected at one end to the covering and unblocking structure and at the other end to the air compressor installed on the floating vessel. The pump pressure channel is connected to the two chambers respectively.

[0011] The switching component connects the pump pressure channel and the air compressor. When the covering and unblocking structure rotates, the switching component enables the pump pressure channel to connect sequentially with the two sets of chambers.

[0012] The dredging device for inland river pollution control described above: the suction structure includes a suction pump installed on the floating vessel, one end of the suction pump is connected to a storage tank installed on the floating vessel, and the other end is connected to a suction pipe, which is connected to the suction head.

[0013] The floating vessel is also equipped with a lifting adjustment device, which is connected to the suction pipe.

[0014] The dredging device for inland river pollution control described above: the covering and dredging structure includes a drive device mounted on the suction pipe, the output shaft of the drive device is connected to a connecting pipe coaxial with the suction head and extending into the interior of the suction head, and a covering is provided at the end of the connecting pipe away from the drive device.

[0015] The dredging device for inland river pollution control described above: the cover is provided with multiple layers of sealing rings on the side facing the inner wall of the suction head, and the cover is provided with a partition on the side facing the inner wall of the suction head, the partition dividing the cover into two chambers.

[0016] The dredging device for inland river pollution control as described above: the pump pressure channel includes two sets of connecting channels arranged along the length of the connecting pipe, and the two sets of connecting channels are respectively connected to the two chambers;

[0017] The pump pressure channel also includes a rotary connecting structure disposed on the connecting pipe, and the rotary connecting structure is connected to the switching component.

[0018] The dredging device for inland river pollution control described above: the rotating communication structure includes a connecting sleeve that is rotatably and sealed on the connecting pipe, and two annular cavities are formed between the connecting sleeve and the inner wall of the connecting pipe;

[0019] The rotary communication structure also includes through holes disposed on the communication pipe and connecting the annular cavity and the connecting channel respectively.

[0020] The dredging device for inland river pollution control as described above: the switching component includes a switching pipe body disposed on the suction pipe, a conduit disposed in the middle of the switching pipe body, and the conduit being connected to the air compressor;

[0021] The switching tube is provided with two flow ports, which are respectively connected to two sets of annular cavities.

[0022] The dredging device for inland river pollution control described above: the switching component further includes:

[0023] A driving component is coaxially connected to the connecting pipe, and the driving component has multiple sets of inclined surfaces arranged equidistantly around its circumference.

[0024] An elastic trigger structure is installed inside the switching tube. One end of the elastic trigger structure is rotatably equipped with an abutment wheel. The abutment wheel cooperates with the inclined surface, enabling the conduit to connect sequentially with the two sets of diversion ports.

[0025] The dredging device for inland river pollution control described above: the elastic triggering structure includes a sealing plug that is slidably disposed in the switching tube body, a telescopic shaft that passes through the switching tube body is connected to the sealing plug, the telescopic shaft is rotatably connected to the abutment wheel, and a cylindrical spring is sleeved on the telescopic shaft, one end of the cylindrical spring is connected to the telescopic shaft, and the other end is connected to the switching tube body.

[0026] A method of using a dredging device for inland river pollution control as described above includes the following steps:

[0027] Step 1: Drive the floating vessel to the designated water area, then adjust the depth of the suction head so that it is submerged in the water and enters the silt.

[0028] Step 2: Activate the suction structure to allow the sludge to enter the suction structure through the screen holes;

[0029] Step 3: Cover and clear the structure stepping action, so that the two chambers rotate step by step around the central axis of the suction head. At the same time, start the air compressor to spray compressed gas through the chambers toward the screen holes to remove the impurities attached to the outside of the screen holes.

[0030] Step 4: While the cover and unblocking structure is rotating, switch the component action so that when the cover and unblocking structure stops, compressed gas can be ejected from the two chambers in sequence.

[0031] Compared with the prior art, the beneficial effects of the present invention are:

[0032] By using the switching components and pump pressure channels, the blocked screen holes are subjected to multiple local backflushings. Compared to overall backflushing, local backflushing ensures backflushing pressure to a certain extent, preventing the blocked screen holes from experiencing insufficient positive pressure due to the pressure relief effect caused by the unblocked screen holes when they are partially blocked or partially cleared. This increases the impact force of compressed gas on the blockages inside the screen holes, thus improving the cleaning effect.

[0033] The designed covering and unblocking structure allows the covering to block and seal some of the screen holes on the suction head. These screen holes will not generate negative pressure, and large particles of impurities attached to the outside of the screen holes can be separated from the suction head under their own gravity. When the covering separates from these screen holes, these screen holes can restore a certain degree of filtration and, to a certain extent, ensure that sludge can pass through the screen holes and enter the suction head. When the blocked screen holes are backflushed, impurities with a diameter similar to that of the screen holes can be sprayed out, further improving the filtration of the screen holes and maintaining the sludge suction speed. Attached Figure Description

[0034] Figure 1 A schematic diagram of the dredging equipment used for inland river pollution control.

[0035] Figure 2 A side view of a dredging machine used for inland river pollution control.

[0036] Figure 3 for Figure 2 Enlarged view of the structure at point A in the middle.

[0037] Figure 4 A schematic diagram of the negative pressure suction mechanism in a dredging device used for inland river pollution control.

[0038] Figure 5 A schematic diagram of the internal structure of the suction head in a dredging device used for inland river pollution control.

[0039] Figure 6 A cross-sectional view of the connecting pipe and the cover in a dredging device for inland river pollution control.

[0040] Figure 7 for Figure 6 Enlarged view of the structure at point B.

[0041] Figure 8 A schematic diagram of the switching components in a dredging device for inland river pollution control.

[0042] Figure 9 A schematic diagram of the internal structure of the switching pipe in a dredging device for inland river pollution control.

[0043] Figure 10 A schematic diagram of another embodiment of the screen holes in a dredging device for inland river pollution control.

[0044] In the diagram: 1. Floating vessel; 2. Suction pump; 3. Storage tank; 4. Suction pipe; 5. Lifting adjustment component; 6. Suction head; 601. Screen hole; 7. Drive unit; 8. Connecting pipe; 801. Connecting channel; 802. Through hole; 9. Covering component; 901. Multi-layer sealing ring; 10. Connecting sleeve; 11. Annular cavity; 12. Drive component; 1201. Inclined surface; 13. Switching pipe body; 1301. Diverter port; 14. Conduit; 15. Air compressor; 16. Sealing plug; 17. Telescopic shaft; 18. Abutment wheel; 19. Cylindrical spring. Detailed Implementation

[0045] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0046] Please see Figures 1-10 As an embodiment of the present invention, the dredging device for inland river pollution control includes a floating hull 1 and two sets of negative pressure suction mechanisms installed on the floating hull 1.

[0047] The negative pressure suction mechanism includes: a suction structure, a covering and unblocking structure, a pump pressure channel, and a switching component.

[0048] The suction structure is installed on the floating vessel 1. The end of the suction structure is equipped with a suction head 6 that is submerged in water. The suction head 6 has multiple sets of sieve holes 601 arranged circumferentially. The sieve holes 601 can filter large particles of impurities in the silt, such as small stones, broken bricks, broken branches and leaves, and hard biological shell fragments, to prevent these impurities from entering the suction pump 2 through the pipeline and causing damage to the internal structure of the suction pump 2.

[0049] The suction structure includes a suction pump 2 installed on the floating vessel 1. One end of the suction pump 2 is connected to a storage tank 3 installed on the floating vessel 1, and the other end is connected to a suction pipe 4. The suction pipe 4 is connected to the suction head 6. The suction pipe 4 and the suction pump 2 are connected by a metal corrugated pipe so that when the height of the suction pipe 4 changes, the sludge can enter the suction pump 2 through the metal corrugated pipe 4.

[0050] The floating vessel 1 is also equipped with a lifting adjustment component 5, which is connected to the suction pipe 4.

[0051] During operation, the depth of the suction head 6 below the water surface is adjusted by the lifting adjustment component 5, ensuring that the suction head 6 is inside the silt. Then, the suction pump 2 is started to create a negative pressure inside the suction pipe 4 and the suction head 6. Under the action of negative pressure, the silt can be pumped up and sent to the storage tank 3. During this process, large particles of impurities in the silt can be filtered out and attached to the outside of the suction head 6, preventing these large particles of impurities from directly entering the suction pump 2 and causing damage to its internal structure.

[0052] Furthermore, the setting of the height of the suction head 6 relies on multiple parameters, including but not limited to: suction pressure feedback, discharge sludge concentration feedback, and direct observation of the scale. Specifically, firstly, the load on the suction pump 2 is different when the suction head 6 is inside or outside the sludge. By measuring the load on the suction pump 2, it is possible to determine to some extent whether the suction head 6 is inside the sludge. Secondly, the sludge concentration discharged into the storage tank 3 is different when the suction head 6 is inside or outside the sludge. By observing the sludge concentration delivered to the storage tank 3, it is also possible to determine to some extent whether the suction head 6 is inside the sludge. Thirdly, based on the prior data obtained by the depth sounder or sonar before dredging, the actual depth of the sludge is determined, and the height of the suction head 6 is adjusted according to the dredging location.

[0053] Please see Figures 5-6 , Figure 9 The covering and unblocking structure is disposed inside the suction head 6, and two independent chambers are formed inside the covering and unblocking structure. These two independent chambers can block the partial sieve holes 601.

[0054] The covering and unblocking structure includes a driving device 7 mounted on the suction tube 4. The output shaft of the driving device 7 is connected to a connecting tube 8 coaxial with the suction head 6 and extending into the interior of the suction head 6. A covering 9 is provided at the end of the connecting tube 8 away from the driving device 7. Specifically, a multi-layer sealing ring 901 is provided on the side of the covering 9 facing the inner wall of the suction head 6 to improve the sealing effect between the edge of the covering 9 and the inner wall of the suction head 6. A partition is provided on the side of the covering 9 facing the inner wall of the suction head 6, which divides the covering 9 into two chambers. The upper cover of the suction head 6 is detachable. After the multi-layer sealing ring 901 is worn to a certain extent, the covering 9 can be removed from the suction head 6 by removing the upper cover, and the multi-layer sealing ring 901 can be replaced in a portable manner.

[0055] In this embodiment, the covering 9 can rotate stepwise under the drive of the driving device 7. During this process, the covering 9 can block and seal the partial screen holes 601 on the suction head 6. At this time, the blocked screen holes 601 are isolated from the negative pressure inside the suction head 6, that is, this part of the screen holes 601 will not generate negative pressure, so that the large particles of impurities attached to the outside of the screen holes 601 can be separated from the suction head 6 under the action of their own gravity. When the covering 9 separates from this part of the screen holes 601, this part of the screen holes 601 can restore a certain degree of filtration and, to a certain extent, ensure that the sludge can pass through the screen holes 601 and enter the interior of the suction head 6.

[0056] Furthermore, when the covering 9 rotates and stops, the air compressor 15 can deliver compressed gas into the covering 9. At this time, the compressed gas can be ejected in the opposite direction from the screen hole 601, thereby removing impurities with a diameter equivalent to the screen hole diameter in the screen hole 601, so as to further improve the filtration of the screen hole 601 and maintain the sludge suction speed.

[0057] Furthermore, the covering 9 only covers a portion of the screen holes 601, and the screen holes 601 that are not covered still have a filtering function. That is, the suction head 6 does not need to stop all the screen holes 601 from operating due to backflushing, which ensures the continuous operation of dredging to a certain extent.

[0058] Please see Figure 1 , Figures 6-7 , Figure 10 One end of the pump pressure channel is connected to the covering and unblocking structure, and the other end is connected to the air compressor 15 installed on the floating vessel 1. The pump pressure channel is connected to the two chambers respectively.

[0059] The pump pressure channel includes two sets of connecting channels 801 arranged along the length of the connecting pipe 8, and the two sets of connecting channels 801 are respectively connected to the two chambers;

[0060] The pump pressure channel also includes a rotary connecting structure disposed on the connecting pipe 8. The rotary connecting structure is connected to the switching component. The rotary connecting structure includes a connecting sleeve 10 that is rotatably disposed on the connecting pipe 8. Two annular cavities 11 are formed between the connecting sleeve 10 and the inner wall of the connecting pipe 8.

[0061] The rotating communication structure also includes a through hole 802 disposed on the communication pipe 8 and connecting the annular cavity 11 and the connecting channel 801 respectively. That is, the two sets of connecting annular cavities 11, through holes 802 and connecting channels 801 form two sets of independent pipelines that connect the two chambers respectively.

[0062] In this embodiment, the driving device 7 drives the covering 9 to rotate step by step through the connecting pipe 8. That is, the connecting pipe 8 is in a rotating state. At this time, the connecting sleeve 10 connects the connecting pipe 8 so that the external air source can stably deliver compressed gas to the corresponding two sets of connecting channels 801 when only the connecting sleeve 10 is connected, thereby generating positive pressure inside the corresponding two sets of chambers and ensuring the stable delivery of compressed gas.

[0063] Furthermore, under the action of the switching component, the compressed gas generated by the air compressor 15 can be sequentially delivered to the two annular cavities 11, thereby causing the two chambers inside the covering 9 to generate independent positive pressures in sequence. This allows for multiple local backflushings of the blocked screen holes 601. Compared to overall backflushing, local backflushing ensures the backflushing pressure to a certain extent, preventing the blocked screen holes 601 from experiencing insufficient positive pressure due to the pressure relief effect of the unblocked screen holes 601 when they are partially blocked or partially cleared. This increases the impact force of the compressed gas on the blockages inside the screen holes 601, thus improving the cleaning effect.

[0064] The aforementioned multiple local backflushing effects are only compared to the overall backflushing effect. In actual use, although local backflushing may also result in local blockage or local unblocking of the sieve hole 601, it still has a corresponding positive unblocking effect compared to the overall backflushing effect.

[0065] Preferably, the opening direction of the screen hole 601 is inclined downward, which allows the compressed gas generated during the backflow when the screen hole 601 is blocked to be sprayed out inclined downward and act on the silt on the riverbed, so that the local silt produces a turbulent effect, making the silt easier to be pumped away.

[0066] Please see Figures 8-9 The switching assembly connects the pump pressure channel and the air compressor 15. When the covering and unblocking structure rotates, the switching assembly enables the pump pressure channel to connect sequentially with the two sets of chambers. The switching assembly includes a switching tube 13 disposed on the suction tube 4. A conduit 14 is disposed in the middle of the switching tube 13 and is connected to the air compressor 15.

[0067] The switching tube 13 is provided with two sets of flow ports 1301, which are respectively connected to two sets of annular cavities 11.

[0068] In this embodiment, the elastic trigger structure is set inside the switching tube 13. During the rotation of the connecting tube 8, the elastic trigger structure can be triggered and acted, so that the two component flow ports 1301 are sequentially connected. During this process, the compressed gas generated by the air compressor 15 can be sequentially delivered to the two chambers, thereby backflushing the screen holes 601 blocked by the two chambers, so as to restore the filtration properties of the screen holes 601.

[0069] The switching component also includes: a driver 12 and an elastic trigger structure.

[0070] The driving component 12 is coaxially connected to the connecting pipe 8, and multiple sets of inclined surfaces 1201 are circumferentially and equidistantly arranged on the driving component 12.

[0071] The elastic triggering structure is disposed inside the switching tube 13. One end of the elastic triggering structure is rotatably provided with an abutment wheel 18. The abutment wheel 18 cooperates with the inclined surface 1201, enabling the conduit 14 to connect sequentially with the two sets of diversion ports 1301.

[0072] The elastic triggering structure includes a sealing plug 16 that is slidably disposed in the switching tube 13. A telescopic shaft 17 that passes through the switching tube 13 is connected to the sealing plug 16. The telescopic shaft 17 is rotatably connected to the abutment wheel 18. A cylindrical spring 19 is sleeved on the telescopic shaft 17. One end of the cylindrical spring 19 is connected to the telescopic shaft 17, and the other end is connected to the switching tube 13.

[0073] During the operation of the drive device 7, it drives the covering part 9 to rotate stepwise through the connecting pipe 8. At the same time, the drive part 12 connected to it will also rotate stepwise. In the initial state, the cylindrical spring 19 is in a compressed state. As the connecting pipe 8 and the drive part 12 rotate, the abutment wheel 18 will cooperate with the inclined surface 1201, causing the cylindrical spring 19 to be further compressed. At the same time, the sealing plug 16 moves to the end of the switching pipe 13 located at the connection port of the conduit 14 away from the cylindrical spring 19. At this time, the conduit 14 is only connected to one of the branch ports 1301, while the other branch port 1301 is isolated and blocked. Meanwhile, the compressed gas generated by the air compressor 15 can enter the switching pipe 13 and be ejected from the connected branch port 1301, and then ejected through one of the chambers. When the connecting pipe 8 and the driving component 12 are switched to the stop state, the abutting wheel 18 separates from the inclined surface 1201. At this time, the cylindrical spring 19 releases its elastic potential energy and drives the telescopic shaft 17 to move. During this process, the sealing plug 16 is pulled and moves. When the sealing plug 16 moves to the other side of the connection port of the conduit 14, the originally isolated and blocked diversion port 1301 is opened, and the originally open diversion port 1301 is in an isolated and blocked state. At this time, the compressed gas generated by the air compressor 15 moves towards another chamber through another diversion port 1301, thereby realizing the sequential opening of the two chambers. Under the constant load of the air compressor 15, the screen hole 601 in the blocked state can obtain a greater recoil force to maximize the filtration performance of the screen hole 601.

[0074] Compared to using electronic control valves to control the flow of compressed gas, this application uses a purely mechanical structure to control the flow of compressed gas. Its advantage is that the switching action and the rotation position of the covering part 9 are strictly mechanically coupled, eliminating the need for the electronic control link of sensor detection, signal transmission, program judgment, and valve action. This eliminates the risk of action delay and signal misalignment to a certain extent, ensuring that the timing of airflow switching and the blocking / exposure of the screen hole 601 are synchronized. Furthermore, it is less affected by environmental factors such as water pressure and silt, ensuring long-term stable operation of the equipment.

[0075] As an embodiment of the present invention, a method for using the dredging device for inland river pollution control as described above is also proposed, comprising the following steps:

[0076] Step 1: Drive the floating boat 1 to the designated water area, and then adjust the depth of the suction head 6 so that it is submerged in the water and enters the silt.

[0077] Step 2: Activate the suction structure to allow the sludge to enter the suction structure through the sieve holes 601;

[0078] Step 3: Cover and clear the structure stepping action, so that the two chambers rotate step by step around the central axis of the suction head 6. At the same time, the air compressor 15 is started, so that the compressed gas is sprayed out through the chamber towards the screen hole 601 to remove the impurities attached to the outside of the screen hole 601.

[0079] Step 4: While the cover and unblocking structure is rotating, switch the component action so that when the cover and unblocking structure stops, compressed gas can be ejected from the two chambers in sequence.

[0080] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0081] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A dredging device for inland river pollution control, comprising a floating hull and two sets of negative pressure suction mechanisms mounted on the floating hull; Its features are, The negative pressure suction mechanism includes: A suction structure is installed on the floating vessel. The end of the suction structure is provided with a suction head that is submerged in water. The suction head is provided with multiple sets of screen holes equidistantly arranged in a circle. A covering and unblocking structure is provided inside the suction head, and two independent chambers are formed within the covering and unblocking structure. These two independent chambers can block some of the sieve holes. The pump pressure channel is connected at one end to the covering and unblocking structure and at the other end to the air compressor installed on the floating vessel. The pump pressure channel is connected to the two chambers respectively. The switching component connects the pump pressure channel and the air compressor. When the covering and unblocking structure rotates, the switching component enables the pump pressure channel to connect sequentially with the two sets of chambers.

2. The dredging device for inland river pollution control according to claim 1, characterized in that, The suction structure includes a suction pump installed on the floating vessel. One end of the suction pump is connected to a storage tank installed on the floating vessel, and the other end is connected to a suction pipe. The suction pipe is connected to the suction head. The floating vessel is also equipped with a lifting adjustment device, which is connected to the suction pipe.

3. The dredging device for inland river pollution control according to claim 1, characterized in that, The covering and unblocking structure includes a driving device disposed on the suction tube. The output shaft of the driving device is connected to a connecting tube that is coaxial with the suction head and extends into the interior of the suction head. A covering is disposed at the end of the connecting tube away from the driving device.

4. The dredging device for inland river pollution control according to claim 3, characterized in that, The cover is provided with multiple sealing rings on the side facing the inner wall of the suction head, and a partition is provided on the side facing the inner wall of the suction head, the partition dividing the cover into two chambers.

5. The dredging device for inland river pollution control according to claim 3, characterized in that, The pump pressure channel includes two sets of connecting channels arranged along the length of the connecting pipe, and the two sets of connecting channels are respectively connected to the two chambers; The pump pressure channel also includes a rotary connecting structure disposed on the connecting pipe, and the rotary connecting structure is connected to the switching component.

6. The dredging device for inland river pollution control according to claim 5, characterized in that, The rotary communication structure includes a communication sleeve that is rotatably and sealingly disposed on the communication pipe, and two annular cavities are formed between the communication sleeve and the inner wall of the communication pipe. The rotary communication structure also includes through holes disposed on the communication pipe and connecting the annular cavity and the connecting channel respectively.

7. The dredging device for inland river pollution control according to claim 6, characterized in that, The switching assembly includes a switching tube body disposed on the suction tube, and a conduit is disposed in the middle of the switching tube body, the conduit being connected to the air compressor. The switching tube is provided with two flow ports, which are respectively connected to two sets of annular cavities.

8. The dredging device for inland river pollution control according to claim 7, characterized in that, The switching component also includes: A driving component is coaxially connected to the connecting pipe, and the driving component has multiple sets of inclined surfaces arranged equidistantly around its circumference. An elastic trigger structure is installed inside the switching tube. One end of the elastic trigger structure is rotatably equipped with an abutment wheel. The abutment wheel cooperates with the inclined surface, enabling the conduit to connect sequentially with the two sets of diversion ports.

9. A dredging device for inland river pollution control according to claim 8, characterized in that, The elastic triggering structure includes a sealing plug that is slidably disposed in the switching tube body. A telescopic shaft that passes through the switching tube body is connected to the sealing plug. The telescopic shaft is rotatably connected to the abutment wheel. A cylindrical spring is sleeved on the telescopic shaft. One end of the cylindrical spring is connected to the telescopic shaft, and the other end is connected to the switching tube body.

10. A method of using a dredging device for inland river pollution control as described in claim 1, characterized in that, Includes the following steps: Step 1: Drive the floating vessel to the designated water area, then adjust the depth of the suction head so that it is submerged in the water and enters the silt. Step 2: Activate the suction structure to allow the sludge to enter the suction structure through the screen holes; Step 3: Cover and clear the structure stepping action, so that the two chambers rotate step by step around the central axis of the suction head. At the same time, start the air compressor to spray compressed gas through the chambers toward the screen holes to remove the impurities attached to the outside of the screen holes. Step 4: While the cover and unblocking structure is rotating, switch the component action so that when the cover and unblocking structure stops, compressed gas can be ejected from the two chambers in sequence.

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