A riverbed sludge dredging and dewatering method and system

Abstract

The invention belongs to the technical field of river channel regulation, and specifically, is a river channel bottom mud dredging and dewatering method and system, comprising a stirring barrel, a sludge sedimentation tank, a liquid homogenizing tank, and a liquid outlet tank which are connected in sequence end to end, the stirring barrel is located at the front end and is connected to the sludge sedimentation tank through a discharge pipe, the sludge sedimentation tank, the liquid homogenizing tank and the liquid outlet tank are separated by a partition and are interconnected, and the sludge sedimentation tank and the liquid homogenizing tank are connected through a discharge port; a dredged bottom mud dewatering and drying device which adopts cofferdam, pool construction, suction, dosing and stirring, static drainage, and solidification is adopted, which has continuity, high construction efficiency, and closed treatment throughout the process, effectively avoiding secondary pollution, adopts an efficient ionic polymer flocculant to realize the enhanced agglomeration and rapid sedimentation of the dredged mud, and can simultaneously adsorb and remove COD and total phosphorus in the water, and further removes ammonia nitrogen in the residual water by adding sodium hypochlorite in the homogenizing tank.

Description

Technical Field

[0001] The invention belongs to the technical field of river channel regulation, and specifically relates to a method and system for dredging and dewatering river channel bottom mud. Background Art

[0002] In the management of riverbed sediment, dredging and silt removal are important measures to ensure the smooth flow of rivers and reduce water pollution. A large amount of high-water content mud will be produced during the dredging process. Due to the large volume of mud, poor sedimentation performance, and high concentration of pollutants, it poses a serious ecological risk.

[0003] The traditional method of treating sludge is to extract the sludge through environmentally friendly suction and transport it to a fixed mud treatment station for post-treatment. This method has low treatment efficiency and secondary pollution during transportation or storage. The dehydration and drying of sludge usually relies on equipment such as filter presses or centrifuges, but these equipment are very expensive, which greatly increases the treatment cost of dredged sludge. At the same time, a large amount of tail water is often generated after the sludge is dehydrated, and the tail water contains a large amount of pollutants that need to be specially treated.

[0004] A Chinese patent application CN217556040U discloses an environmentally friendly lake sediment online dredging and dehydration solidification system, the main points of its technical solution are: it includes a sediment capture ship, a sediment transfer ship, a movable sediment rapid dehydration and drying platform and a dry mud transport ship arranged in sequence, the sediment capture ship includes a mud shoveling device and a mud collection tank, the mud shoveling device includes a mud shoveling bucket and a mud pressing plate, the mud pressing plate is arranged at the front end of the mud shoveling bucket, and a mud scraper arranged in a long strip is provided in the middle of the mud pressing plate.

[0005] However, the above technology often has the following defects: a method for treating riverbed mud through a series of operations such as suction, slag removal, sedimentation, homogenization, and filtration, in which the mud is squeezed and filtered by a large plate and frame filter press to form a mud cake. The required equipment is expensive and the treatment efficiency is low, and the liquid after filtration still needs to be purified for a second time, and the process flow is complicated. Therefore, the present invention provides a method and system for dredging and dewatering riverbed mud. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve the technical problem is as follows: a riverbed sludge dredging and dewatering system according to the present invention comprises a stirring barrel, a sludge sedimentation tank, a liquid homogenizing tank, and a liquid outlet tank which are connected in sequence end to end, wherein the stirring barrel is located at the front end and is connected to the sludge sedimentation tank through a discharge pipe, the sludge sedimentation tank, the liquid homogenizing tank and the liquid outlet tank are separated by a partition and are interconnected, and the sludge sedimentation tank and the liquid homogenizing tank are connected through a discharge port;

[0008] A sealing cover is provided on the top surface of the mixing barrel, a feed pipe for slurry is provided on the sealing cover, a discharge pipe is connected to the bottom end of the mixing barrel, a connecting shaft is rotatably connected to the bottom surface of the sealing cover, a motor is provided on the top surface of the sealing cover, an output shaft is rotatably connected to the bottom surface of the motor, and a stirring blade is provided on the connecting shaft.

[0009] Preferably, the volume ratio of the sedimentation tank, the liquid homogenization tank and the liquid outlet tank is 2:1:1, three sedimentation tanks are provided, one liquid homogenization tank and one liquid outlet tank are provided, the sedimentation tanks are inclined, the three sedimentation tanks are parallel sedimentation tanks, and the sedimentation tanks are replaced every three days so that the bottom mud can be dried in the sedimentation tanks in turn. The dredging depth is set to 20-40 cm, and the water content of the pumped mud is 90%-98%.

[0010] Preferably, the volume of the mixing tank is 10m 3 -11m 3 The speed of the stirrer is 20r / min-22r / min. The mud and the dehydrating agent are stirred for 1-3 minutes and then discharged into the sedimentation tank. The dehydrating agent is an ionic polymer flocculant, which is prepared into a 0.3-0.6wt% solution and stored in a plastic bucket. It is pumped into the stirring bucket through a dosing pump. The dosage of the dehydrating agent is set to 1-8L / m 3 The muddy water is discharged into the sedimentation tank and the sedimentation process is completed within 1 to 5 minutes. A dosing pipe is set at the outlet along the width of the homogenizing tank. The length of the pipe is the same as the width of the homogenizing tank. A 3mm hole is punched every 30cm to facilitate uniform dosing. The mass concentration of the sodium hypochlorite solution is 10wt%, and the concentration is 0.1 to 2m 3 The liquid is pumped into the homogenizing tank at a flow rate of / h. The liquid is allowed to stand in the homogenizing tank for 30 minutes and in the outlet tank for 3 hours before being discharged into the river.

[0011] Preferably, a plurality of groups of hollow fixed rods are fixedly connected to the surface of the connecting shaft, a sliding rod is provided at one end of the fixed rod away from the connecting shaft, a groove is provided at one end of the sliding rod away from the fixed rod, the stirring blade is tiltedly arranged in the groove, and a driving mechanism for moving the sliding rod is provided in the connecting shaft.

[0012] Preferably, the driving mechanism includes a driving rod fixed to the inner wall of the mixing barrel, the interior of the connecting shaft is a hollow structure, the fixed rod is connected to the connecting shaft, the sliding rod is sealingly and slidably connected to the inner wall of the fixed rod, a first spring is fixedly connected between one end of the sliding rod close to the connecting shaft and the fixed rod, the bottom surface of the connecting shaft is slidingly connected to the connecting rod, the top of the connecting rod is fixedly connected to a sliding disk sealingly and slidably connected to the inner wall of the connecting shaft, a second spring is fixedly connected between the bottom surface of the sliding disk and the inner wall of the connecting shaft, the bottom surface of the connecting rod is fixedly connected to a driving block, and the side of the driving block close to the driving rod is inclined.

[0013] Preferably, a hollow ring is fixedly connected to the bottom surface of the sealing cover, the connecting shaft is sealingly and rotatably connected to the inner wall of the hollow ring, a pair of connecting grooves are provided between the connecting shaft and the hollow ring, a connecting pipe is connected to the side wall of the hollow ring, the stirring blade is rotatably connected to the groove through a rotating shaft, and a torsion spring for resetting the rotating shaft is provided on the rotating shaft, and a water outlet mechanism is provided on the stirring blade.

[0014] Preferably, the end of the connecting tube away from the hollow ring is connected to a hollow block, a slide is slidably connected inside the hollow block, a push rod is slidably connected to the top surface of the hollow block, a round rod is slidably connected to the surface of the push rod, the round rod is fixedly connected to the hollow block through a bracket, the bottom surface of the push rod is fixedly connected to the slide, a moving mechanism for driving the slide rod to move is provided on the output shaft, the side wall of the hollow block is connected to a liquid inlet pipe, and a liquid inlet check valve is provided in the liquid inlet pipe.

[0015] A method for dredging and dehydrating riverbed mud, the method adopts the above-mentioned riverbed mud dredging, dehydrating and drying device, and the method comprises the following steps:

[0016] S1: By using temporary sandbag cofferdams to intercept the area upstream and downstream of the dredging area, temporary silt sedimentation tanks, liquid homogenization tanks and liquid outlet tanks are arranged at low locations near the dredging area in combination with the terrain characteristics;

[0017] S2: The volume ratio of the sludge sedimentation tank, liquid homogenization tank and liquid outlet tank is 2:1:1. Multiple sludge sedimentation tanks are set up, and the sludge sedimentation tanks are inclined. The sludge sedimentation tanks are replaced every three days;

[0018] S3: Use a mud pump to suck the bottom mud, arrange several stirring barrels, pump the sucked mud from the feed pipe into the stirring barrel, add dehydrating agent into the stirring barrel, drive the connecting shaft to rotate with the help of a motor, let the stirring blade stir the mud for 1-3 minutes, and the speed of the connecting shaft is 20r / min-22r / min;

[0019] S4: The slurry is discharged from the discharge pipe into the sludge sedimentation tank. After the slurry is precipitated, the supernatant is discharged into the liquid homogenization tank through the discharge port set at the top of one side. A dosing pipe is set at the top discharge port along the width direction of the liquid homogenization tank. The length of the pipe is the same as the width of the liquid homogenization tank. A 3mm hole is drilled every 30cm. Sodium hypochlorite solution is added at the dosing pipe to allow the supernatant and the sodium hypochlorite solution to be fully mixed;

[0020] S5: After the liquid is allowed to stand in the liquid homogenization tank, it is discharged into the liquid outlet tank. After the liquid is allowed to stand in the liquid outlet tank, it is discharged into the river. After the supernatant in the sludge sedimentation tank is drained, the remaining sludge is solidified after drying and then digested on site as planting soil.

[0021] The beneficial effects of the present invention are as follows:

[0022] 1. The dredged sludge dewatering and drying device adopts cofferdam, pool construction, suction, chemical addition and stirring, static drainage and solidification. It is continuous, has high construction efficiency and closed treatment throughout the process, which effectively avoids secondary pollution. The high-efficiency ionic polymer flocculant is used to achieve the enhanced agglomeration and rapid sedimentation of the dredged mud. At the same time, the COD and total phosphorus in the water can be adsorbed and removed simultaneously. In the homogenization tank, sodium hypochlorite is added to further remove the ammonia nitrogen in the residual water, so that the suspended matter, COD, ammonia nitrogen and total phosphorus values ​​in the dehydrated liquid are greatly reduced, and the discharge can meet the standards, which truly realizes the reduction and environmental protection of the dredged mud.

[0023] 2. After the upper separation liquid in the sedimentation tank is drained, the remaining sludge is dried by natural airing, avoiding the use of large-scale sludge drying equipment and greatly reducing the processing cost. It has the characteristics of simple device and easy operation. The feasibility of this device has been fully demonstrated through engineering examples. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below in conjunction with the accompanying drawings.

[0025] Figure 1 It is a three-dimensional diagram of the mixing barrel of the present invention;

[0026] Figure 2 It is a schematic diagram of the structure of the sludge sedimentation tank, the liquid homogenization tank and the liquid outlet tank in the present invention;

[0027] Figure 3 It is a schematic diagram of the internal structure of the mixing barrel in the present invention;

[0028] Figure 4 yes Figure 3 A magnified image of point A;

[0029] Figure 5 yes Figure 3 The enlarged view of point B;

[0030] Figure 6It is a structural schematic diagram of the water outlet mechanism in the present invention;

[0031] Figure 7 yes Figure 6 Enlarged view of point C;

[0032] Figure 8 yes Figure 6 The enlarged view of point D;

[0033] Fig. 9 It is a flow chart of the drying method in the present invention.

[0034] In the figure: 1. sludge sedimentation tank; 2. liquid homogenization tank; 3. liquid outlet tank; 4. discharge port; 5. stirring barrel; 6. sealing cover; 7. feed pipe; 8. discharge pipe; 9. output shaft; 10. connecting shaft; 11. fixed rod; 12. sliding rod; 13. stirring blade; 14. sliding plate; 15. connecting rod; 16. driving block; 17. driving rod; 18. connecting pipe; 19. hollow ring; 20. connecting groove; 21. hollow block; 22. sliding plate; 23. round rod; 24. pushing rod; 25. supporting rod; 26. magnetic block; 27. through groove; 28. hollow groove; 29. ​​rotating shaft; 30. connecting hole; 31. connecting groove; 32. moving rod; 33. guide groove; 34. guide rod. DETAILED DESCRIPTION

[0035] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0036] Embodiment 1: Figures 1 to 5 As shown, a riverbed sludge dredging and dewatering system according to an embodiment of the present invention comprises a stirring barrel 5, a sludge sedimentation tank 1, a liquid homogenizing tank 2, and a liquid outlet tank 3 connected in sequence end to end, wherein the stirring barrel 5 is located at the front end and is connected to the sludge sedimentation tank 1 through a discharge pipe 8, the sludge sedimentation tank 1, the liquid homogenizing tank 2, and the liquid outlet tank 3 are separated by a partition and are interconnected, and the sludge sedimentation tank 1 and the liquid homogenizing tank 2 are connected through a discharge port 4;

[0037] The top surface of the mixing barrel 5 is provided with a sealing cover 6, and a feeding pipe 7 for feeding mud is provided on the sealing cover 6. The bottom end of the mixing barrel 5 is connected with a discharging pipe 8. The bottom surface of the sealing cover 6 is rotatably connected with a connecting shaft 10. The top surface of the sealing cover 6 is provided with a motor, and the bottom surface of the motor is rotatably connected with an output shaft 9. The connecting shaft 10 is provided with a stirring blade 13.

[0038] The present application uses temporary sandbag cofferdams to intercept the area upstream and downstream of the dredging range, selects a low place to arrange a temporary sludge sedimentation tank 1, a liquid homogenization tank 2 and a liquid outlet tank 3 in combination with the terrain characteristics near the dredging area, uses a mud pump to suck the bottom mud, arranges a number of stirring barrels 5, pumps the sucked mud from the feed pipe 7 into the stirring barrel 5, then adds a dehydrating agent, drives the connecting shaft 10 to rotate with the help of a motor, and stirs the mud with the stirring blades 13 for 1-3 minutes, and then discharges it into the sludge sedimentation tank 1 from the discharge pipe 8. After the mud is precipitated, the supernatant is discharged into the liquid homogenization tank 2, and sodium hypochlorite solution is evenly added at the discharge port of the sludge sedimentation tank 1, so that the supernatant and the sodium hypochlorite solution are fully fused, and discharged into the liquid outlet tank 3 after standing in the liquid homogenization tank 2; the liquid is discharged into the river after standing in the liquid outlet tank 3, and after the supernatant of the sludge sedimentation tank 1 is drained, the remaining bottom mud is dried and solidified and then digested on the spot as planting soil.

[0039] A plurality of hollow fixed rods 11 are fixedly connected to the surface of the connecting shaft 10, a sliding rod 12 is provided at one end of the fixed rod 11 away from the connecting shaft 10, a groove is provided at one end of the sliding rod 12 away from the fixed rod 11, the stirring blade 13 is tiltedly arranged in the groove, and a driving mechanism for moving the sliding rod 12 is arranged in the connecting shaft 10; the present application allows the stirring blade 13 to better stir the mud by tilting the stirring blade 13, and while stirring, the driving sliding rod 12 can be used to move back and forth, thereby driving the stirring blade 13 to move, and at this time the stirring blade 13 can better contact with the mud, thereby improving the mixing of the mud and the dehydration agent.

[0040] The driving mechanism includes a driving rod 17 fixed to the inner wall of the mixing barrel 5, the interior of the connecting shaft 10 is a hollow structure, the fixed rod 11 is connected to the connecting shaft 10, the sliding rod 12 is sealed and slidably connected to the inner wall of the fixed rod 11, a first spring is fixedly connected between the end of the sliding rod 12 close to the connecting shaft 10 and the fixed rod 11, the bottom surface of the connecting shaft 10 is slidably connected to the connecting rod 15, the top of the connecting rod 15 is fixedly connected to a sliding plate 14 sealed and slidably connected to the inner wall of the connecting shaft 10, and a second spring is fixedly connected between the bottom surface of the sliding plate 14 and the inner wall of the connecting shaft 10. The bottom surface of the connecting rod 15 is fixedly connected with a driving block 16, and the side of the driving block 16 close to the driving rod 17 is in an inclined shape; in the present application, when the connecting shaft 10 rotates, the driving rod 17 will repeatedly push the driving block 16, and then the driving block 16 will drive the sliding plate 14 to move up and down. When the sliding plate 14 moves upward, it will push the gas in the connecting shaft 10 into the fixed rod 11, and then push the sliding rod 12 to drive the stirring blade 13 to move. When the sliding plate 14 moves downward, the sliding rod 12 will drive the stirring blade 13 to reset under the pull of the first spring, so that the stirring blade 13 can move back and forth.

[0041] The bottom surface of the sealing cover 6 is fixedly connected with a hollow ring 19, the connecting shaft 10 is sealingly rotatably connected with the inner wall of the hollow ring 19, a pair of connecting grooves 20 are provided between the connecting shaft 10 and the hollow ring 19, the side wall of the hollow ring 19 is connected with a connecting pipe 18, the stirring blade 13 is rotatably connected with the groove through a rotating shaft 29, and a torsion spring is provided on the rotating shaft 29 to reset the rotating shaft 29, and a water outlet mechanism is provided on the stirring blade 13; the present application injects water into the hollow ring 19 through the connecting pipe 18, and then the water enters the connecting shaft 10 from the connecting groove 20, and finally the water fills the connecting shaft 10 and the fixing rod 11, and then the water continues to be injected. , it will push the slide bar 12, so that the slide bar 12 pushes the stirring blade 13 to rotate and fit the inner wall of the stirring barrel 5, and then drives the connecting shaft 10 to rotate with the help of the output shaft 9. At this time, the stirring blade 13 will clean the mud on the barrel wall, and at the same time, the water will be discharged with the help of the water outlet mechanism, so that the water can be flushed on the barrel wall, further improving the cleaning effect of the barrel wall, and at this time, the driving rod 17 can still push the driving block 16, so that the sliding plate 14 pushes the water in the connecting shaft 10, so that the water is pressurized and discharged from the water outlet mechanism, so that the water can better impact the barrel wall. If it is necessary to discharge the water in the connecting shaft 10, it is only necessary to connect a water pump to the connecting pipe 18.

[0042] The end of the connecting pipe 18 away from the hollow ring 19 is connected to a hollow block 21, a slide plate 22 is slidably connected inside the hollow block 21, a push rod 24 is slidably connected to the top surface of the hollow block 21, a round rod 23 is slidably connected to the surface of the push rod 24, the round rod 23 is fixedly connected to the hollow block 21 through a bracket, the bottom surface of the push rod 24 is fixedly connected to the slide plate 22, a moving mechanism for driving the slide rod 12 to move is provided on the output shaft 9, a liquid inlet pipe is connected to the side wall of the hollow block 21, and a liquid inlet check valve is provided in the liquid inlet pipe;

[0043] The present application can inject the dehydrating agent into the hollow block 21 from the liquid inlet pipe, and then the dehydrating agent will enter the sliding rod 12 and the fixed rod 11 along the connecting pipe 18 and fill them. At this time, the output shaft 9 can drive the connecting shaft 10 to rotate, and then the dehydrating agent is discharged with the help of the drainage mechanism, so that the dehydrating agent can be better injected into the mud of different layers, thereby greatly improving the mixing effect of the dehydrating agent and the mud. During the injection process of the dehydrating agent, the sliding plate 22 can be driven by the moving mechanism to move, so that the sliding plate 22 pushes the dehydrating agent in the hollow block 21, so that the dehydrating agent is pressurized, so that the dehydrating agent can be better injected into the mud. Water can also be added into the hollow block 21 through the above-mentioned mechanism, and then pressurized by the hollow block 21 and sprayed out from the water outlet mechanism.

[0044] The moving mechanism includes a support rod 25 fixedly connected to the output shaft 9, and the end of the support rod 25 away from the output shaft 9 is fixedly connected to a magnetic block 26 that is magnetically attracted to the push rod 24, and a third spring is fixedly connected between the top surface of the slide plate 22 and the inner wall of the hollow block 21; the present application rotates the magnetic block 26 through the output shaft 9, so that the magnetic block 26 moves to the top of the push rod 24, and the push rod 24 will be attracted by the magnetic block 26 at this time, and then when the dehydration agent in the hollow block 21 needs to be pressurized, the output shaft 9 can drive the magnetic block 26 to move away from the top of the push rod 24, and the slide plate 22 will pressurize the dehydration agent under the push of the third spring.

[0045] Embodiment 2: Figures 6 to 8 As shown, compared with Example 1, another implementation of the present invention is: the water outlet mechanism includes a hollow groove 28 provided in the slide rod 12, the slide rod 12 is provided with a through groove 27 connected to the hollow groove 28 along the axial direction, the rotating shaft 29 is provided with a connecting hole 30, the inner wall of the hollow groove 28 is provided with a connecting groove 31 which is staggered with the connecting hole 30, and the side wall of the stirring blade 13 is provided with multiple groups of inclined water outlet holes; in the present application, when water is filled in the fixed rod 11, it will enter the hollow groove 28 from the through groove 27, and then the water will push the slide rod 12 to move, and when the stirring blade 13 is in contact with the barrel wall, the rotating shaft 29 will rotate, and at this time the connecting groove 31 will be aligned with the connecting hole 30, and then water will enter the stirring blade 13, and finally spray onto the barrel wall from the inclined water outlet hole, and at the same time, the dehydration agent can also be sprayed into the mud through the above mechanism.

[0046] The inner wall of the water outlet hole is fixedly connected with a hollow guide rod 34, and a moving rod 32 is sealed and slidably connected inside the guide rod 34. A fourth spring is fixedly connected between the moving rod 32 and the inner wall of the guide rod 34. A plurality of guide grooves 33 are provided in the moving rod 32, and a water inlet hole is provided at one end of the guide rod 34 away from the moving rod 32. In the present application, after water enters the stirring blade 13, the water will fill the stirring blade 13, and then enter the guide rod 34 from the water inlet hole to push the moving rod 32 until the guide groove 33 leaks out of the guide rod 34. At this time, water will spray from the guide groove 33 onto the barrel wall. When the guide groove 33 is in the guide rod 34, mud can be prevented from entering the stirring blade 13. At the same time, the dehydration agent can also be sprayed out with the help of the guide hole. When the dehydration agent stops spraying, the fourth spring will quickly pull the guide rod 34 to reset it, so as to effectively prevent mud from entering the guide groove 33.

[0047] like Fig. 9 As shown, a method for dredging and dewatering riverbed mud, the method adopts the above-mentioned riverbed mud dredging and dewatering system, and the method comprises the following steps:

[0048] S1: By using temporary sandbag cofferdams to intercept the area upstream and downstream of the dredging area, temporary silt sedimentation tank 1, liquid homogenization tank 2 and liquid outlet tank 3 are arranged at low places near the dredging area in combination with the terrain characteristics;

[0049] S2: The volume ratio of the sludge sedimentation tank 1, the liquid homogenization tank 2 and the liquid outlet tank 3 is 2:1:1. Multiple sludge sedimentation tanks 1 are set, and the sludge sedimentation tanks 1 are inclined. The sludge sedimentation tanks 1 are replaced every three days (because after the sludge sedimentation tanks 1 are filled and drained, the remaining mud needs to be dried for several days before it can be transported away. Therefore, when a sludge sedimentation tank 1 is full of drying mud, it cannot be used temporarily. At this time, another sludge sedimentation tank 1 is opened to achieve the effect of continuous operation);

[0050] S3: Use a mud pump to suck the bottom mud, arrange several stirring barrels 5, pump the sucked mud from the feed pipe 7 into the stirring barrel 5, add dehydrating agent into the stirring barrel 5, drive the connecting shaft 10 to rotate with the help of a motor, let the stirring blade 13 stir the mud for 1-3 minutes, and the speed of the connecting shaft 10 is 20r / min-22r / min;

[0051] S4: The sludge is discharged from the discharge pipe 8 into the sludge sedimentation tank 1. After the sludge is precipitated, the supernatant is discharged into the liquid homogenization tank 2 through the discharge port 4 arranged at the top of one side (a valve body for controlling the flow of liquid is arranged inside the discharge port 4). A dosing pipe is arranged at the top discharge port 4 along the width direction of the liquid homogenization tank 2. The length of the pipe is the same as the width of the liquid homogenization tank 2. A 3mm hole is drilled every 30cm. Sodium hypochlorite solution is added at the dosing pipe to allow the supernatant to fully blend with the sodium hypochlorite solution, thereby further improving the treatment effect of the supernatant;

[0052] S5: After the liquid homogenization tank 2 is allowed to stand, it is discharged into the liquid outlet tank 3. After the liquid is allowed to stand in the liquid outlet tank 3, it is discharged into the river. After the supernatant of the sludge sedimentation tank 1 is drained, the remaining sludge is solidified by drying and then digested on site as planting soil.

[0053] Working principle: By using temporary sandbag cofferdams to intercept the area upstream and downstream of the dredging area, temporary sludge sedimentation tank 1, liquid homogenization tank 2 and liquid outlet tank 3 are arranged at low places in combination with the terrain characteristics near the dredging area, the bottom mud is sucked by a mud pump, and several stirring barrels 5 are arranged. The sucked mud is pumped into the stirring barrel 5 from the feed pipe 7, and then the dehydrating agent is added. The connecting shaft 10 is driven by the motor to rotate, and the stirring blade 13 stirs the mud for 1-3 minutes, and then the mud is discharged from the outlet. The material pipe 8 is discharged into the sludge sedimentation tank 1. After the sludge is precipitated, the supernatant is discharged into the liquid homogenization tank 2 through the discharge port 4 set at the top of one side, and the sodium hypochlorite solution is evenly added at the discharge port 4 of the sludge sedimentation tank 1, so that the supernatant and the sodium hypochlorite solution are fully fused. After standing in the liquid homogenization tank 2, the liquid is discharged into the liquid outlet tank 3; the liquid is discharged into the river after standing in the liquid outlet tank 3. After the supernatant of the sludge sedimentation tank 1 is drained, the remaining bottom mud is solidified by drying and then digested on the spot as planting soil;

[0054] The present application tilts the stirring blade 13 so that the stirring blade 13 can stir the mud better. While stirring, the driving slide bar 12 can be used to move back and forth, thereby driving the stirring blade 13 to move. At this time, the stirring blade 13 can better contact with the mud, thereby improving the mixing of the mud and the dehydration agent. When the connecting shaft 10 rotates, the driving rod 17 will repeatedly push the driving block 16. At this time, the driving block 16 will drive the sliding plate 14 to move up and down. When the sliding plate 14 moves upward, it will push the gas in the connecting shaft 10 into the fixed rod 11, and then push the sliding rod 12 to drive the stirring blade 13 to move. When the sliding plate 14 moves downward, the sliding rod 12 will drive the stirring blade 13 to reset under the pull of the first spring, so that the stirring blade 13 can move back and forth.

[0055] The present application injects water into the hollow ring 19 through the connecting pipe 18, and then the water enters the connecting shaft 10 from the connecting groove 20, and finally the water fills the connecting shaft 10 and the fixing rod 11. After that, when the water continues to be injected, it will push the sliding rod 12, so that the sliding rod 12 pushes the stirring blade 13 to rotate and fit the inner wall of the mixing barrel 5, and then the connecting shaft 10 is driven to rotate by the output shaft 9. At this time, the stirring blade 13 will clean the mud on the barrel wall, and at the same time, the water is discharged by the water outlet mechanism, so that the water can be flushed on the barrel wall. , further improving the cleaning effect of the barrel wall, and at this time the driving rod 17 can still push the driving block 16, so that the sliding plate 14 pushes the water in the connecting shaft 10, so that the water is pressurized and discharged from the water outlet mechanism, so that the water can better impact the barrel wall, if it is necessary to discharge the water in the connecting shaft 10, it is only necessary to connect a water pump to the connecting pipe 18; the present application can inject the dehydrating agent into the hollow block 21 from the liquid inlet pipe, and then the dehydrating agent will enter the sliding rod 12 and the fixed rod 11 along the connecting pipe 18 and fill it, at this time the output shaft 9 can drive the connecting shaft 10 to rotate, and then the dehydrating agent is discharged with the help of the drainage mechanism, so that the dehydrating agent can be better injected into the mud of different layers, thereby greatly improving the mixing effect of the dehydrating agent and the mud, during the injection process of the dehydrating agent, the sliding plate 22 can be driven to move with the help of the moving mechanism, so that the sliding plate 22 pushes the dehydrating agent in the hollow block 21, so that the dehydrating agent is pressurized, so that the dehydrating agent can be better is injected into the mud, and water can also be added into the hollow block 21 through the above-mentioned mechanism, and then be pressurized by the hollow block 21 and sprayed out from the water outlet mechanism; the present application rotates the magnetic block 26 through the output shaft 9, so that the magnetic block 26 moves to the top of the push rod 24, at this time the push rod 24 will be attracted by the magnetic block 26, and then when the dehydration agent in the hollow block 21 needs to be pressurized, the output shaft 9 can drive the magnetic block 26 to move away from the top of the push rod 24, and at this time the slide plate 22 will pressurize the dehydration agent under the push of the third spring.

[0056] The above-mentioned front, back, left, right, top and bottom are all based on the figures in the specification. Figure 1 As a benchmark, according to the person's observation perspective, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0057] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present invention.

[0058] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A riverbed sludge dredging and dewatering system, Features: The invention comprises a stirring barrel (5) - a sludge sedimentation tank (1) - a liquid homogenizing tank (2) - a liquid outlet tank (3) which are connected in sequence end to end, wherein the stirring barrel (5) is located at the front end and is connected to the sludge sedimentation tank (1) via a discharge pipe (8), the sludge sedimentation tank (1), the liquid homogenizing tank (2) and the liquid outlet tank (3) are separated by a partition and are interconnected, and the sludge sedimentation tank (1) and the liquid homogenizing tank (2) are connected via a discharge port (4); The top surface of the mixing barrel (5) is provided with a sealing cover (6), a feeding pipe (7) for feeding mud is provided on the sealing cover (6), and the bottom end of the mixing barrel (5) is connected with a discharge pipe (8); The bottom surface of the sealing cover (6) is rotatably connected to a connecting shaft (10), the top surface of the sealing cover (6) is provided with a motor, the bottom surface of the motor is rotatably connected to an output shaft (9), and a stirring blade (13) is provided on the connecting shaft (10); A plurality of groups of hollow fixed rods (11) are fixedly connected to the surface of the connecting shaft (10); a sliding rod (12) is provided at one end of the fixing rod (11) away from the connecting shaft (10); a groove is provided at one end of the sliding rod (12) away from the fixing rod (11); the stirring blade (13) is tiltedly arranged in the groove; and a driving mechanism for moving the sliding rod (12) is provided in the connecting shaft (10); The driving mechanism comprises a driving rod (17) fixed to the inner wall of the mixing barrel (5); the interior of the connecting shaft (10) is a hollow structure; the fixed rod (11) is connected to the connecting shaft (10); the sliding rod (12) is sealingly and slidably connected to the inner wall of the fixed rod (11); a first spring is fixedly connected between the end of the sliding rod (12) close to the connecting shaft (10) and the fixed rod (11); a connecting rod (15) is slidably connected to the bottom surface of the connecting shaft (10); a sliding plate (14) is fixedly connected to the inner wall of the connecting shaft (10) at the top end of the connecting rod (15); a second spring is fixedly connected between the bottom surface of the sliding plate (14) and the inner wall of the connecting shaft (10); a driving block (16) is fixedly connected to the bottom surface of the connecting rod (15); and a side of the driving block (16) close to the driving rod (17) is in an inclined shape; The bottom surface of the sealing cover (6) is fixedly connected to a hollow ring (19); the connecting shaft (10) is sealingly rotatably connected to the inner wall of the hollow ring (19); a pair of connecting grooves (20) are provided between the connecting shaft (10) and the hollow ring (19); a connecting pipe (18) is connected to the side wall of the hollow ring (19); the stirring blade (13) is rotatably connected to the groove via a rotating shaft (29); a torsion spring for returning the rotating shaft (29) is provided on the rotating shaft (29); and a water outlet mechanism is provided on the stirring blade (13); One end of the connecting pipe (18) away from the hollow ring (19) is connected to a hollow block (21), a slide plate (22) is slidably connected inside the hollow block (21), a push rod (24) is slidably connected to the top surface of the hollow block (21), a round rod (23) is slidably connected to the surface of the push rod (24), the round rod (23) is fixedly connected to the hollow block (21) via a bracket, the bottom surface of the push rod (24) is fixedly connected to the slide plate (22), a moving mechanism for driving the slide rod (12) to move is provided on the output shaft (9), a side wall of the hollow block (21) is connected to a liquid inlet pipe, and a liquid inlet check valve is provided inside the liquid inlet pipe; The moving mechanism comprises a support rod (25) fixedly connected to the output shaft (9); one end of the support rod (25) away from the output shaft (9) is fixedly connected to a magnetic block (26) magnetically attracted to the push rod (24); and a third spring is fixedly connected between the top surface of the slide plate (22) and the inner wall of the hollow block (21).

2. A riverbed mud dredging and dewatering system according to claim 1, characterized in that: The water outlet mechanism comprises a hollow groove (28) formed in the slide rod (12); a through groove (27) extending through the slide rod (12) along the axial direction and communicating with the hollow groove (28); a communicating hole (30) formed on the rotating shaft (29); a communicating groove (31) offset from the communicating hole (30) formed on the inner wall of the hollow groove (28); and a plurality of groups of water outlet holes arranged obliquely formed on the side wall of the stirring blade (13).

3. A riverbed mud dredging and dewatering system according to claim 2, characterized in that: A hollow guide rod (34) is fixedly connected to the inner wall of the water outlet hole, a moving rod (32) is sealingly and slidably connected inside the guide rod (34), a fourth spring is fixedly connected between the moving rod (32) and the inner wall of the guide rod (34), a plurality of guide grooves (33) are provided through the moving rod (32), and a water inlet hole is provided at one end of the guide rod (34) away from the moving rod (32).

4. A method for dredging and dewatering riverbed mud, the method adopting a riverbed mud dredging and dewatering system as claimed in claim 3, characterized in that: The method comprises the following steps: S1: By using temporary sandbag cofferdams to intercept the area upstream and downstream of the dredging area, temporary silt sedimentation tanks (1), liquid homogenization tanks (2) and liquid outlet tanks (3) are selected at low locations near the dredging area in accordance with the terrain characteristics; S2: the volume ratio of the sludge sedimentation tank (1), the liquid homogenization tank (2) and the liquid outlet tank (3) is 2:1:1, a plurality of sludge sedimentation tanks (1) are provided, and the sludge sedimentation tanks (1) are inclined, and the sludge sedimentation tanks (1) are replaced every three days; S3: The bottom mud is sucked by a mud pump, and a plurality of stirring barrels (5) are arranged. The sucked mud is pumped into the stirring barrel (5) through the feed pipe (7), and a dehydrating agent is added to the stirring barrel (5). The connecting shaft (10) is driven to rotate by a motor, and the stirring blades (13) stir the mud for 1-3 minutes. The rotation speed of the connecting shaft (10) is 20 r / min-22 r / min.

5. A method for dredging and dewatering riverbed mud according to claim 4, characterized in that: The method further comprises the steps of: S4: The slurry is discharged from the discharge pipe (8) into the sludge sedimentation tank (1). After the slurry is precipitated, the supernatant is discharged into the liquid homogenization tank (2) through the discharge port (4) arranged at the top of one side. A dosing pipe is arranged at the top discharge port (4) along the width direction of the liquid homogenization tank (2). The length of the pipe is the same as the width of the liquid homogenization tank (2). A 3 mm hole is drilled every 30 cm. Sodium hypochlorite solution is added at the dosing pipe to allow the supernatant and the sodium hypochlorite solution to be fully mixed. S5: After the liquid homogenization tank (2) is allowed to stand, it is discharged into the liquid outlet tank (3). After the liquid is allowed to stand in the liquid outlet tank (3), it is discharged into the river. After the supernatant in the sludge sedimentation tank (1) is drained, the remaining sludge is solidified by drying and then digested on site to be used as planting soil.

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