Drainage channel dredging system

Abstract

The present application relates to the field of drainage engineering, and discloses a drainage ditch desilting system, which comprises a plurality of chain mud scrapers (2) arranged in sequence along the drainage direction of a drainage ditch (1) and capable of respectively pushing deposited sludge downstream of the drainage direction of the drainage ditch (1), and a flushing mechanism capable of spraying flushing fluid downstream of the drainage direction of the drainage ditch (1) between any two adjacent chain mud scrapers (2). The drainage ditch desilting system can relay clean the deposited sludge in the drainage ditch through the combined application of the plurality of chain mud scrapers and the flushing mechanism, facilitating the automatic cleaning of the drainage ditch with a relatively long length or having a curved section or a corner section, and eliminating the need to separately set a sludge collecting pool at the downstream position corresponding to each chain mud scraper.

Description

Technical Field

[0001] This invention relates to the field of drainage engineering, and more specifically to a drainage ditch dredging system. Background Technology

[0002] Drainage ditches are crucial facilities for collecting sewage, factory wastewater, and rainwater during rainfall. The collected sewage flows by gravity into pumping stations or wastewater treatment plants for processing. Most drainage ditches are underground open trenches constructed of cast-in-place concrete, covered with concrete slabs, and capable of supporting heavy machinery. However, due to the long distances, gentle slopes, uneven drainage volume, and high impurity content of these ditches, when the drainage volume decreases and the water flow slows, a large amount of impurities gradually settles in the ditches, causing siltation and blockage. To ensure the normal operation of the drainage system, blocked drainage ditches need to be shut down and cleaned.

[0003] Currently, the main method for cleaning drainage ditches is manual labor. This method requires first sealing both ends of the drainage ditch to divert upstream drainage elsewhere. Then, an excavator is used to remove the ditch cover, dredge the sludge, and transport it away by truck. Next, the drainage ditch is manually flushed with water to restore water flow, and then the concrete cover is replaced. This cleaning method is time-consuming and labor-intensive, with high labor and machinery costs, low dredging efficiency, and a high risk of environmental pollution.

[0004] To address this, existing technologies have proposed a drainage ditch dredging method based on chain-plate scrapers. This method utilizes chain-plate scrapers installed within the drainage ditch to push the deposited sludge into a sludge collection pool located downstream of the drainage direction, effectively improving dredging efficiency. However, this method can only be used for straight drainage ditches, the dredging length is limited by the operating length of the chain-plate scrapers used, and sludge collection pools need to be set up downstream of each chain-plate scraper, resulting in a complex system structure. Furthermore, for drainage ditches with bends or corners, impurities tend to accumulate at these bends or corners due to water flow changes, making automated cleaning using the aforementioned method difficult. Summary of the Invention

[0005] The purpose of this invention is to overcome the problems of existing drainage dredging systems being complex in structure and inconvenient for automated cleaning of long drainage ditches or those with curved or corner sections. This invention provides a drainage dredging system that can efficiently clean the silt deposited in drainage ditches using multiple chain scrapers, facilitating automated cleaning of long drainage ditches or those with curved or corner sections without the need to set up sludge collection tanks downstream of each chain scraper.

[0006] To achieve the above objectives, the present invention provides a drainage ditch dredging system, comprising a plurality of chain scrapers arranged sequentially along the drainage direction of the drainage ditch and capable of pushing deposited sludge downstream of the drainage ditch in the drainage direction, and a flushing mechanism configured to spray flushing fluid downstream of the drainage ditch between two adjacent chain scrapers.

[0007] Preferably, the drainage ditch has a straight section in which at least two of the chain scrapers are arranged, and / or, the drainage ditch has drainage sections extending in different directions and forming curved or corner sections where the drainage sections meet each other, and the flushing mechanism is configured to spray the flushing fluid downstream of the drainage ditch in the drainage direction of the curved or corner sections.

[0008] Preferably, the chain scraper includes a driver and a scraper chain, on which a plurality of scraper blades are arranged at intervals along the running direction. The scraper blades are capable of pushing the deposited sludge at the bottom of the drainage ditch during the operation of the scraper chain driven by the driver.

[0009] Preferably, the chain scraper includes a drive sprocket and a steering sprocket arranged at intervals along the drainage direction of the drainage ditch, the scraping chain surrounding and cooperating with the drive sprocket and the steering sprocket, the drive sprocket being driven by the driver to cause the scraping chain to circulate.

[0010] Preferably, at least one of the drive sprocket and the steering sprocket is connected to a tensioning device that applies a force away from the other to the at least one of the drive sprocket and the steering sprocket, so that the scraper chain remains taut.

[0011] Preferably, the scraper chain is made of HPPA material, the scraper blade is made of reinforced fiberglass, and / or the spacing between adjacent scraper blades is 1.0m-1.5m.

[0012] Preferably, the flushing mechanism includes flushing nozzles arranged at opposite positions of two adjacent chain scrapers, a flushing water pipe for supplying the flushing fluid to the flushing nozzles, and a flushing water pump connected to the flushing water pipe.

[0013] Preferably, the flushing mechanism includes multiple sets of flushing spray guns arranged in different areas, each set of flushing spray guns corresponding to different areas between the same or different adjacent chain scrapers. The drainage dredging system also includes a controller configured to sequentially activate each set of flushing spray guns in a direction from downstream to upstream of the drainage ditch to flush different locations of the drainage ditch in sequence.

[0014] Preferably, the flushing spray gun has a flat, fan-shaped nozzle, and / or the nozzle of the flushing spray gun faces downstream of the centerline of the drainage ditch.

[0015] Preferably, the drainage ditch dredging system further includes a sludge collection tank located at the end of the drainage ditch, into which the deposited sludge pushed by the chain scraper and the flushing fluid sprayed by the flushing mechanism can be discharged. The flushing water pump is arranged in the sludge collection tank and connected to the flushing water pipe so as to deliver the supernatant in the sludge collection tank to the flushing spray gun.

[0016] Preferably, the sludge collection tank has a settling chamber and a water collection chamber separated by a partition wall. The sedimented sludge pushed by the chain scraper and the flushing fluid sprayed by the flushing mechanism can be discharged into the settling chamber. The supernatant in the settling chamber can overflow into the water collection chamber. The settling chamber is equipped with a submersible agitator and a slurry pump connected to the external space. The flushing water pump is arranged in the water collection chamber.

[0017] Preferably, the rinsing mechanism includes an air compressor connected to the rinsing water pipe.

[0018] Through the above technical solution, the drainage dredging system of the present invention uses a combination of multiple chain scrapers and flushing mechanisms. One or more chain scrapers are set up along the drainage direction in the straight section of the drainage ditch to push the deposited sludge. In the longer straight section, the flushing mechanism is used to flush the sludge between two adjacent chain scrapers downstream. And / or, the flushing mechanism is used to flush the sludge in the curved or corner sections (if any) of the drainage ditch downstream. In order to use multiple chain scrapers to clean the deposited sludge in the drainage ditch in relay, it is convenient to realize the automated cleaning of drainage ditches that are long or have curved or corner sections, without the need to set up sludge collection tanks downstream of each chain scraper. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a drainage ditch dredging system according to a preferred embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures

[0021] 1-Drainage ditch; 2-Chain scraper; 21-Scraper chain; 22-Drive sprocket; 23-Steering sprocket; 3-Flushing spray gun; 4-Flushing water pipe; 5-Flushing water pump; 6-Air compressor; 7-Air pipe; 8-Electric switch; 9-Sludge collection tank; 91-Settling chamber; 92-Water collection chamber; 93-Partition wall; 94-Submersible mixer; 95-Slurry pump. Detailed Implementation

[0022] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0023] Reference Figure 1 As shown, a drainage ditch dredging system according to a preferred embodiment of the present invention includes multiple (two or more) chain scrapers 2 arranged sequentially along the drainage direction of the drainage ditch 1, and a flushing mechanism configured to spray flushing fluid downstream of the drainage ditch 1 between adjacent chain scrapers 2 in the drainage direction. Each chain scraper 2 can push deposited sludge downstream of the drainage ditch 1 in the drainage direction. The spraying end of the flushing mechanism (as shown in the figure, the outlet of the flushing spray gun 3) can be arranged at positions opposite to adjacent chain scrapers 2 to spray flushing fluid into the drainage ditch 1 (especially towards the downstream of the adjacent chain scraper 2). Thus, through the combined application of multiple chain scrapers 2 and the flushing mechanism, this drainage dredging system can utilize multiple chain scrapers 2 to relay the cleaning of deposited sludge in the drainage ditch 1, facilitating automated cleaning of long drainage ditches or those with curved or corner sections, without the need to separately install sludge collection tanks downstream of each chain scraper.

[0024] Specifically, for a long straight drainage ditch or a long straight section of a drainage ditch, multiple chain scrapers 2 can be arranged sequentially in it, and a flushing mechanism can be used to flush the sludge between two adjacent chain scrapers 2 downstream. Thus, the upstream chain scraper 2 pushes the deposited sludge to the area between it and the adjacent downstream chain scraper 2, and the flushing mechanism can flush the sludge in this area to the working area of ​​the adjacent downstream chain scraper 2 by spraying flushing fluid, from the point where the cleaning can be carried out in relay until the position where the sludge can be collected (as shown in the sludge collection tank 9 in the figure).

[0025] For example, for a drainage ditch 1 with curved or corner sections, where different parts of the drainage ditch 1 extend in different directions (non-linear directions), chain scrapers 2 can be installed at different parts of the drainage ditch 1 extending in different directions. The flushing mechanism can then flush the sludge downstream at the curved or corner sections. Thus, the chain scraper 2 located upstream pushes the deposited sludge to the curved or corner position, and the flushing mechanism can flush the sludge at that position to the working area of ​​the chain scraper 2 located downstream by spraying flushing fluid, so as to avoid the accumulation of impurities at the curved or corner position, until the sludge can be collected (as shown in the sludge collection tank 9 in the figure), which facilitates the automated cleaning of non-linear drainage ditches.

[0026] The drainage dredging system of this invention solves the problem of easy siltation and blockage in drainage ditches, facilitating automated and information-based online dredging of complex drainage ditches. It addresses the problems of time-consuming, labor-intensive, costly, and environmentally polluting manual dredging, while avoiding downtime for dredging, improving dredging efficiency, and ensuring long-term stable operation of the drainage ditch. In the preferred embodiment shown in the figures, the drainage ditch 1 is exemplarily depicted as having straight sections with extended lengths and two chain scrapers 2, as well as straight sections with only one chain scraper 2, and corner sections that allow the different straight sections to extend in different directions. A flushing mechanism is provided at any position opposite to any two adjacent chain scrapers 2, enabling multiple chain scrapers 2 to continuously transport silt downstream. It is understood that the flushing mechanism of this invention sprays flushing fluid downstream of the drainage ditch 1 in the drainage direction, not limited to a spray direction parallel to the extension direction of the drainage ditch 1. Depending on the flushing needs and structural arrangement, the spray direction can have an angle relative to the extension direction of the drainage ditch 1. For example, in the schematic diagram, the nozzle of the flushing spray gun 3 of the flushing mechanism is directed downstream of the centerline of the drainage ditch 1. That is, the nozzle of the flushing spray gun 3 is inclined relative to both the extension direction and the cross-sectional direction of the drainage ditch 1, and is inclined towards the centerline of the drainage ditch 1 along the drainage direction.

[0027] In addition, the spraying position of the flushing mechanism includes, but is not limited to, the area between two adjacent chain scrapers 2, and some flushing fluid can also be sprayed to the opposite ends of the two adjacent chain scrapers 2. In order to facilitate efficient relay cleaning, adjacent chain scrapers 2 can be arranged as close to each other as possible, thereby avoiding excessive requirements on the spraying pressure and flushing fluid flow rate of the flushing mechanism.

[0028] Based on the above, the drainage dredging system of the present invention can be applied to the automatic dredging of various different drainage ditches. For example, for a long straight drainage ditch or a long straight section in a drainage ditch, multiple chain scrapers 2 can be arranged sequentially, and a flushing mechanism can be used to flush the silt between two adjacent chain scrapers 2 downstream. For a drainage ditch 1 with curved or corner sections, that is, the drainage ditch 1 has drainage sections extending in different directions and forming curved or corner sections where the drainage sections connect with each other, chain scrapers 2 can be installed in each drainage section, and a flushing mechanism can be used to spray flushing fluid downstream in the drainage direction of the drainage ditch 1 from the curved or corner section. For a drainage ditch 1 that has both long straight sections and curved or corner sections, then... Figure 1 As shown, one or more chain scrapers 2 are arranged according to the extension of the straight section, and a flushing mechanism is provided at any position where any two adjacent chain scrapers 2 are opposite each other (including curved sections or corner sections).

[0029] The chain scraper 2 used in this invention can be an existing structure capable of pushing deposited sludge from drainage ditches. Typically, the chain scraper 2 may include, for example, a driver (not shown) of an electric motor or hydraulic motor, and a scraper chain 21 driven by the driver, on which a plurality of scraper blades are arranged at intervals along the running direction. Each scraper blade can be perpendicular to the extension direction of the drainage ditch 1. As the driver drives the scraper chain 21, the scraper blades can push the deposited sludge deposited at the bottom of the drainage ditch 1 downstream. The spacing between adjacent scraper blades can be set to 1.0m-1.5m, thereby allowing a single chain scraper 2 to clean a straight section of the drainage ditch 1 with a length of 50m-100m.

[0030] More specifically, each chain scraper 2 can have a drive sprocket 22 and a steering sprocket 23 arranged at intervals along the drainage direction of the drainage ditch 1 (straight section). The drive sprocket 22 is driven to the driver, and the scraper chain 21 surrounds the drive sprocket 22 and the steering sprocket 23 and engages with them respectively. Thus, the driver drives the scraper chain 21 to circulate through the drive sprocket 22. The scraper chain 21 moves in the same direction as the drainage direction when it reaches the part near the bottom of the drainage ditch 1, thereby pushing the deposited sludge at the bottom of the drainage ditch 1 downstream in the drainage direction.

[0031] Furthermore, to ensure that the scraper chain 21 effectively receives the driving force transmitted by the drive sprocket 22 and that the scraper blades effectively push the deposited sludge, the chain scraper 2 may also be equipped with a tensioning device. This tensioning device is connected to one of the drive sprocket 22 and the steering sprocket 23, and applies a tensioning force to the other in a direction away from the drive sprocket 22 and the steering sprocket 23 to keep the scraper chain 21 taut.

[0032] Because the wastewater discharged from drainage ditch 1 may contain various corrosive chemicals or be at high temperatures, the parts of the chain scraper 2 that come into contact with the wastewater and sediment must be designed to withstand these harsh environmental conditions. In a preferred embodiment, the scraper chain 21 can be made of HPPA (High-Performance Polyamide). HPPA is a high-performance polyamide material, also known as ultra-high temperature polyamide. It has excellent heat resistance, chemical resistance, mechanical strength, and insulation properties, and can be used to manufacture high-performance mechanical parts, electronic components, and automotive parts. HPPA material has high chemical resistance and mechanical strength, good resistance to acids, alkalis, organic solvents, and oils, and high tensile strength, flexural strength, and impact strength. In addition, HPPA material has good dimensional stability, a low linear coefficient of thermal expansion, and low water absorption, which ensures the long-term stable operation of the chain scraper 2.

[0033] Sludge scrapers can be made of reinforced fiberglass, a composite material made of glass fiber and resin. Compared to ordinary fiberglass, reinforced fiberglass performs better in terms of strength, stiffness, durability, and corrosion resistance. Reinforced fiberglass offers advantages such as high strength, lightweight, durability, and corrosion resistance, making it well-suited for various complex wastewater environments. Furthermore, it is relatively easy to manufacture and process, and its shape and size can be customized as needed.

[0034] like Figure 1 As shown, in a preferred embodiment of the drainage dredging system of the present invention, the flushing mechanism may include flushing spray guns 3 arranged at opposite positions of adjacent chain scrapers 2 and flushing water pipes 4 for supplying flushing fluid (such as water) to the flushing spray guns 3. The flushing water pipes 4 can pressurize and supply flushing water from a suitable water source to the flushing spray guns 3 to flush the sludge between two adjacent chain scrapers 2. At opposite positions of adjacent chain scrapers 2, multiple flushing spray guns 3 can be evenly arranged on both sides of the drainage ditch 1, thereby flushing the deposited sludge in the drainage ditch 1 downstream under the flushing action of high-pressure water. Through high-pressure water flushing, the sludge cleaned at the end of the previous chain scraper 2 in the straight section of the drainage ditch 1 is flushed to the beginning of the next chain scraper 2, thus relaying the cleaning of sludge in the drainage ditch 1; through high-pressure water flushing, the sludge in the curved and corner sections is flushed to the beginning of the chain scraper 2 in the straight section or to the sludge collection pool at the end of the drainage ditch.

[0035] As mentioned above, the flushing spray gun 3 can be arranged on both sides of the drainage ditch 1 and can be configured with a flat fan-shaped nozzle. On the one hand, it can ensure the flushing intensity of the flushing water, and on the other hand, it can increase the coverage area of ​​the flushing water. The nozzle can be tilted towards the middle and downstream of the drainage ditch to ensure effective flushing of the sludge on the adjacent chain scraper 2 components.

[0036] The flushing spray guns 3 arranged in the drainage ditch 1 can operate in a sequential manner, opening from downstream to upstream. Therefore, the flushing mechanism can include multiple sets of flushing spray guns 3 arranged in different areas, each set corresponding to a different area between two adjacent chain scrapers 2 (either the same or different). In the schematic diagram, the areas corresponding to the four sets of flushing spray guns 3 are labeled as area A, area B1, area B2, and area C, respectively. These four sets of flushing spray guns 3 flush in the order of area A, B1, B2, and C. To achieve this, a controller (not shown) is used to first open the electric switch 8 on the flushing pipe 4 where the flushing spray gun 3 corresponding to area A is located, using a flushing water pump to flush the sludge in area A, typically for 5-10 minutes. Then, the electric switch 8 on the flushing pipe 4 where the flushing spray gun 3 corresponding to area A is located is closed, and the electric switch 8 on the flushing pipe 4 where the flushing spray gun 3 corresponding to area B1 is located is opened to flush the sludge in area B1, typically for 5-10 minutes. This process is repeated, flushing different areas of the drainage ditch sequentially from downstream to upstream. By operating the system in a sequential, zoned flushing manner, a relatively small-flow flushing pump 5 can be used while ensuring sufficient flushing pressure and flow rate in each zone to achieve a good flushing effect. Furthermore, by controlling the chain scraper 2 and the flushing mechanism to operate intermittently and at set intervals, the system's operating time and intervals can be set according to the sludge deposition in the drainage ditch. This ensures smooth drainage in the ditch and allows for reasonable setting of operating times, saving energy.

[0037] Continue to refer to Figure 1 As shown, the drainage ditch dredging system of the present invention may further include a sludge collection tank 9 at the end of the drainage ditch 1, into which the deposited sludge pushed by the chain scraper 2 and the flushing fluid (and the sludge carried by it) sprayed by the flushing mechanism can be discharged for further treatment. In this case, the flushing water pipe 4 of the flushing mechanism can be configured to transport the flushing fluid (supernatant after sedimentation) in the sludge collection tank 9 to the flushing spray gun 3. With this configuration, the flushing water is recycled, which not only effectively saves water resources but also avoids excessive demand on the volume of the sludge collection tank 9.

[0038] Furthermore, the sludge collection tank 9 can be divided into a sedimentation chamber 91 and a water collection chamber 92, which are separated by a partition wall 93. The sedimented sludge pushed by the chain scraper 2 and the flushing fluid sprayed by the flushing mechanism can be discharged into the sedimentation chamber 91, and the supernatant in the sedimentation chamber 91 can overflow into the water collection chamber 92. The flushing water pump 5, which pumps the flushing fluid to the flushing water pipe 4, can be arranged in the water collection chamber 92. Thus, after the flushing fluid enters the sludge collection tank 9 from the drainage channel 1, it first settles in the sedimentation chamber 91, and the supernatant enters the water collection chamber 92, and is then pumped by the flushing water pump 5 for reuse in flushing the drainage channel 1. This effectively prevents solid matter from being sucked into the flushing water pump 5, ensuring the service life of the flushing mechanism.

[0039] In other embodiments, the sludge collection tank 9 can also be configured as an undivided structure, with the flushing water pump 5 positioned at a relatively high level within it, reducing the intake of solid matter through filtration devices or the like. Alternatively, the flushing water pump 5 can pump flushing water from other water sources to the flushing spray gun 3 via the flushing water pipe 4.

[0040] The flushing mechanism may also include an air compressor 6 connected to the flushing water pipe 4 via an air duct 7, which supplies compressed air to the flushing water pipe 4. When the flushing spray gun 3 stops flushing, the air compressor 6 can be used to drain the residual water in the flushing water pipe 4 to prevent sludge carried in the flushing water from accumulating and clogging the pipe. Furthermore, during winter operation, supplying compressed air via the air compressor 6 to drain the residual water also prevents the residual water from freezing and affecting the normal operation of the system.

[0041] When the sludge in the sludge collection tank 9 reaches a certain storage volume, the sludge needs to be discharged in a timely manner. To this end, the sludge collection tank 9 (specifically, the settling chamber 91) can be equipped with a submersible mixer 94 and a slurry pump 95. The submersible mixer 94 can be configured as a propeller-type mixer and can be installed on the side wall of the collection tank 9 to perform a mixing and stirring function, effectively preventing sludge deposition in the settling tank. When the sludge in the settling tank reaches a certain storage volume, it can be pumped out by the slurry pump 95 and transported by tanker truck or directly to a designated location.

[0042] Based on the above, the drainage ditch dredging system of the present invention has many advantages:

[0043] (1) By combining two dredging mechanisms and methods, it can be applied to online automatic dredging of straight and non-straight drainage ditches;

[0044] (2) Multiple chain scrapers can be installed along the straight section of the drainage ditch, which can cover a wide area, dredge a long distance, and achieve high dredging efficiency.

[0045] (3) The chain scraper can be equipped with a tensioning device to realize the online automatic tensioning of the scraper chain and ensure that the scraper chain is in a horizontal stress state;

[0046] (4) The sludge scraper chain can be made of high-strength composite reinforced HPPA material, which has high corrosion resistance and is suitable for drainage ditches containing high salt water and acidic or alkaline water.

[0047] (5) The scraper blade is made of reinforced fiberglass, which has sufficient strength and rigidity and is not easily deformed;

[0048] (6) Use flushing spray guns to flush and clean the sludge in the curved section, corner section and the junction of the two chain scrapers, so that the sludge cleaning process can be used in a wider range of applications.

[0049] (7) The water used to rinse the spray gun is taken from the collection pool at the end of the drainage ditch. The sewage from the drainage ditch is used as the rinsing water source, so there is no need to use fresh water, thus saving water.

[0050] (8) Each set of flushing spray guns is arranged on both sides of the drainage ditch. The nozzles can be designed in a fan shape to ensure the flushing water intensity and increase the flushing water coverage area. The nozzle outlets are inclined towards the middle and downstream of the drainage ditch.

[0051] (9) The high-pressure flushing spray guns arranged in the drainage ditch are operated in a sequential manner from downstream to upstream, and the flushing time is generally 5-10 minutes. A flushing water pump with a smaller flow rate can be selected to ensure the flushing pressure and flow rate of each flushing area and achieve a good flushing effect.

[0052] (10) An air compressor is installed in the process system of the present invention. When the high-pressure flushing spray gun stops running, the residual water in the pipeline is drained by compressed air. On the one hand, it prevents the sludge carried by the residual water from depositing and clogging the pipeline. On the other hand, it prevents the residual water in the pipeline from freezing and affecting the operation of the system during winter.

[0053] (11) The sludge collection tank is equipped with a submersible mixer and a slurry pump to prevent sludge deposition, and at the same time, it can realize timely cleaning of the sludge collection tank and meet the needs of sludge transportation and disposal.

[0054] (12) The chain scraper and high-pressure flushing gun can be operated intermittently and at timed intervals. The system operating time and operating interval can be set according to the sludge deposition in the drainage ditch. This not only ensures smooth drainage in the drainage ditch, but also saves energy by setting the operating time reasonably.

[0055] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A drainage ditch dredging system, characterized in that, The system includes multiple chain scrapers (2) arranged sequentially along the drainage direction of the drainage ditch (1) and capable of pushing deposited sludge downstream of the drainage ditch (1) in the drainage direction, and a flushing mechanism configured to spray flushing fluid downstream of the drainage ditch (1) between two adjacent chain scrapers (2); the drainage ditch dredging system also includes a sludge collection tank (9) located at the end of the drainage ditch (1), into which the deposited sludge pushed by the chain scrapers (2) and the flushing fluid sprayed by the flushing mechanism can be discharged.

2. The drainage ditch dredging system according to claim 1, characterized in that, The drainage ditch (1) has a straight section in which at least two of the chain scrapers (2) are arranged, and / or the drainage ditch (1) has drainage sections extending in different directions and forming curved or corner sections where the drainage sections meet each other, and the flushing mechanism is configured to spray the flushing fluid downstream of the drainage direction of the drainage ditch (1) in the curved or corner sections.

3. The drainage ditch dredging system according to claim 1, characterized in that, The chain scraper (2) includes a driver and a scraper chain (21). The scraper chain (21) is provided with a plurality of scraper blades arranged at intervals along the running direction. The scraper blades can push the sediment deposited at the bottom of the drainage ditch (1) during the operation of the scraper chain (21) driven by the driver.

4. The drainage ditch dredging system according to claim 3, characterized in that, The chain scraper (2) includes a drive sprocket (22) and a steering sprocket (23) arranged at intervals along the drainage direction of the drainage channel (1), the scraper chain (21) surrounding and cooperating with the drive sprocket (22) and the steering sprocket (23), the drive sprocket (22) being driveably connected to the driver so as to be driven by the driver to make the scraper chain (21) circulate.

5. The drainage ditch dredging system according to claim 4, characterized in that, At least one of the drive sprocket (22) and the steering sprocket (23) is connected to a tensioning device that applies a force away from the other to the at least one of the drive sprocket (22) and the steering sprocket (23) so that the scraper chain (21) remains taut.

6. The drainage ditch dredging system according to claim 3, characterized in that, The scraper chain (21) is made of HPPA material, the scraper blades are made of reinforced fiberglass, and / or the spacing between adjacent scraper blades is 1.0m-1.5m.

7. The drainage ditch dredging system according to claim 1, characterized in that, The flushing mechanism includes flushing nozzles (3) arranged at opposite positions of two adjacent chain scrapers (2), a flushing water pipe (4) for supplying the flushing fluid to the flushing nozzles (3), and a flushing water pump (5) connected to the flushing water pipe (4).

8. The drainage ditch dredging system according to claim 7, characterized in that, The flushing mechanism includes multiple sets of flushing spray guns (3) arranged in different areas. Each set of flushing spray guns (3) corresponds to different areas between two adjacent chain scrapers (2) of the same or different types. The drainage dredging system also includes a controller that is configured to sequentially open each set of flushing spray guns (3) in the direction from downstream to upstream of the drainage ditch (1) to flush different positions of the drainage ditch (1) in sequence.

9. The drainage ditch dredging system according to claim 7, characterized in that, The flushing spray gun (3) has a flat, fan-shaped nozzle, and / or the nozzle of the flushing spray gun (3) is oriented downstream of the centerline of the drainage ditch (1).

10. The drainage ditch dredging system according to claim 7, characterized in that, The flushing water pump (5) is arranged in the sludge collection tank (9) and connected to the flushing water pipe (4) so ​​as to deliver the supernatant in the sludge collection tank (9) to the flushing spray gun (3).

11. The drainage ditch dredging system according to claim 10, characterized in that, The sludge collection tank (9) has a sedimentation chamber (91) and a water collection chamber (92) separated by a partition wall (93). The sedimented sludge pushed by the chain scraper (2) and the flushing fluid sprayed by the flushing mechanism can be discharged into the sedimentation chamber (91). The supernatant in the sedimentation chamber (91) can overflow into the water collection chamber (92). The sedimentation chamber (91) is equipped with a submersible agitator (94) and a slurry pump (95) connected to the external space. The flushing water pump (5) is arranged in the water collection chamber (92).

12. The drainage ditch dredging system according to claim 7, characterized in that, The flushing mechanism includes an air compressor (6) connected to the flushing water pipe (4).

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