Deep filter dewatering integrated device suitable for dredging solidified soil

Abstract

The application discloses a deep filtration and dehydration integrated device suitable for dredged solidified soil, relates to the technical field of dredged slurry dehydration, and aims at the problem that the driving force of traditional pipe bags relying on the self weight of slurry is difficult to be transmitted to the central area, resulting in weak consolidation of the central slurry and further causing the layered dehydration phenomenon; in the application, on one hand, the multi-chamber segmented filling design of the split pipe bag is combined with the radial mechanical extrusion of the three-way pressure filtration assembly to construct a composite consolidation system with the cooperation of the self weight and mechanical force, the problems of insufficient consolidation driving force of the traditional soil pipe bag, weak consolidation of the central area and layered dehydration are effectively solved, the dehydration depth and uniformity of the dredged solidified soil are improved, and the risk of bag explosion caused by overall high-pressure filling is avoided; on the other hand, the intermittent communication structure of the filling disc and the communication disc is used to realize the automatic switching filling of the multi-chamber, the alternating filling-pressure filtration circulation mode of the three inner cavities is combined to realize the continuous operation of the dredged slurry dehydration process.

Description

Technical Field

[0001] This invention relates to the field of dredging slurry dewatering technology, specifically to an integrated deep filtration and dewatering device suitable for dredged and solidified soil. Background Technology

[0002] The silt generated from river dredging is typically characterized by high water content (85%-95%), high fine particle content (clay content >20%), high organic matter content, and complex composition. It often contains pollutants such as heavy metals, nitrogen, and phosphorus. Silt that has not been effectively dehydrated is bulky, has high transportation costs, and is prone to leakage. Direct landfilling or dumping not only occupies a large amount of land resources but also generates leachate that pollutes groundwater and soil, releases foul-smelling gases that pollute the atmosphere, and causes serious secondary environmental problems.

[0003] Currently, the commonly used sludge dewatering technologies in engineering mainly include three categories: mechanical dewatering (plate and frame filter press, belt filter press, centrifugal dewatering), natural drying, and geotextile bag dewatering. Among them, geotextile bag dewatering technology is a new type of sludge dewatering technology. The basic principle of this technology is: the conditioned sludge is pumped under high pressure into a tubular bag made of high-strength polypropylene woven fabric. Utilizing the filtration characteristics of the bag and the pressure of the sludge's own weight, water is discharged through the pores of the bag, while solid particles are trapped inside the bag and gradually compacted and solidified, eventually forming a solid mud cake with a certain strength.

[0004] For the traditional tube bag self-weight consolidation method, its intermittent operation leads to limited filling pressure, which easily results in insufficient deep dewatering of the mud in the center of the tube bag. That is, because the traditional tube bag is an integral structure, in order to avoid the bag bursting, it can only rely on the weight of the mud to form a weak consolidation driving force. Moreover, this driving force decays rapidly with the surface compaction and cannot be transmitted to the central area. As a result, the mud in the center is in a weak consolidation state for a long time, and water is difficult to drain, forming a layered dewatering phenomenon that fails to meet the standards.

[0005] Therefore, the present invention proposes a solution. Summary of the Invention

[0006] The purpose of this invention is to provide an integrated deep filtration and dewatering device suitable for dredged and solidified soil, which solves the problem that traditional tubular bags rely on the driving force of the mud's own weight to be difficult to transmit to the central area, resulting in weak consolidation of the central mud and thus stratified dewatering.

[0007] The objective of this invention can be achieved through the following technical solution: a deep filtration and dewatering integrated device suitable for dredging and solidified soil, comprising a split tube bag, wherein the split tube bag is divided into at least three inner cavities by a detachable connecting layer, and the volume of each inner cavity gradually decreases from top to bottom; the split tube bag is fitted with a filling pipe for mud injection through the middle of the connecting layer corresponding to each inner cavity. The three-dimensional filter press assembly includes horizontally radially distributed pull rods outside the split tube bag. The ends of the pull rods are hinged to symmetrically swaying connecting rods. The ends of each pair of swaying connecting rods are rotatably provided with deflecting connecting rods. The inner side of the deflecting connecting rods is connected to a filter press plate that is in close contact with the outer wall of the split tube bag. The filling plate is rotatably disposed above the middle of the split tube bag. The middle of the top connecting layer of the split tube bag is flexibly connected to a connecting plate that is connected to the filling tube. The filling plate has filling holes that are intermittently connected to the connecting plates.

[0008] The configuration is further defined as follows: a support frame is installed in the middle of the upper side of the split tube bag, the connecting plate is installed in the middle of the support frame, and the lower end of the connecting plate is connected to an elastic connecting pipe for each injection hole, and the lower end of the elastic connecting pipe is connected to the filling pipe.

[0009] The following configuration is further provided: a driven gear ring is installed at the upper end of the injection plate, a motor is installed on the side of the upright frame near the driven gear ring, and the output end of the motor is connected to a drive tooth that meshes with the driven gear ring.

[0010] The further configuration includes: a feed pipe rotatably mounted on the upper end of the infusion plate, and a mixer connection pipe for adding conditioning agents installed on one side of the feed pipe.

[0011] The further configuration includes: a longitudinally distributed annular hoop is embedded inside the split tube bag, and a longitudinal belt connected to the annular hoop is simultaneously embedded inside the split tube bag; a one-way valve is installed on the connecting layer inside the split tube bag for one-way conveying of mud from top to bottom.

[0012] A further feature is provided: a base is installed at the bottom of the split tube bag, and a water collection tank for collecting filtrate after pressure filtration is provided on the upper surface of the base corresponding to the outer side of the split tube bag.

[0013] Further configuration: an installation frame and a guide plate of the same diameter are installed on the outer side of the split tube bag from the outside to the inside; a hydraulic cylinder is horizontally installed on the inner side of the installation frame; the output end of the hydraulic cylinder is connected to a pull rod; and a locking bolt that is rotatably connected to a swing linkage is connected to the end of the pull rod that passes through the guide plate.

[0014] The filter press is further configured such that an extension plate is installed on both sides of the filter press plate, and each set of filter press plates and extension plates corresponds to the middle of each inner cavity in the horizontal direction.

[0015] The present invention has the following beneficial effects: 1. To address the problem that traditional geotextile bags rely on the weight of the slurry to drive the load to the central area, resulting in weak consolidation of the central slurry and subsequent stratified dewatering, a multi-chamber, segmented filling design of the split geotextile bag, combined with the radial mechanical compression of the three-dimensional filter press assembly, is used to construct a composite consolidation system that integrates self-weight and mechanical force. This effectively solves the problems of insufficient consolidation driving force, weak consolidation in the central area, and stratified dewatering associated with traditional geotextile bags, improving the dewatering depth and uniformity of dredged and solidified soil, while avoiding the risk of bag bursting during overall high-pressure filling.

[0016] 2. Furthermore, through the intermittent connection structure between the injection plate and the connecting plate, the automatic switching of filling multiple chambers is realized. Combined with the alternating filling-filtration circulation mode of the three inner chambers, the continuous operation of the dredging mud dewatering process is realized, thereby improving the processing efficiency and equipment utilization rate of the device. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a side sectional view of the present invention; Figure 3 This is a structural diagram of the radial three-dimensional filter press assembly of the present invention; Figure 4 This is a diagram showing the internal structure of the split-tube bag of the present invention; Figure 5 This is an exploded view of the intermittent infusion assembly of the present invention; Figure 6 This is a schematic diagram of the installation of the one-way valve on the connecting layer of the present invention; Figure 7 This is a schematic diagram of the radial three-dimensional pressure filter assembly of the present invention in the pressure filter state.

[0019] In the diagram: 1. Split-type tubular bag; 2. Connecting layer; 3. Mounting bracket; 4. Hydraulic cylinder; 5. Guide plate; 6. Tie rod; 7. Screw rod; 8. Stand; 9. Connecting disc; 10. Feed pipe; 11. Drive gear; 12. Locking bolt; 13. Swinging linkage; 14. Deflection linkage; 15. Filter press plate; 16. Annular hoop; 17. Longitudinal belt; 18. Filling pipe; 19. Mixer connecting pipe; 20. Filling hole; 21. One-way valve; 22. Base; 23. Water collection tank; 24. Extended pressure plate; 25. Driven gear ring; 26. Flexible connecting pipe; 27. Motor. Detailed Implementation

[0020] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] Example 1: To address the problem that traditional tubular bags rely on the weight of the mud itself for driving force, which is difficult to transmit to the central region, leading to weak consolidation of the central mud and subsequent stratification and dewatering, the following technical solution is proposed: Reference Figure 1 - Figure 7 As shown, the deep filtration and dewatering integrated device for dredging and solidified soil in this embodiment includes a split tube bag 1. The split tube bag 1 is divided into at least three inner cavities by a detachable connecting layer 2, and the volume of each inner cavity gradually decreases from top to bottom. The split tube bag 1 is fitted with a filling tube 18 for mud injection through the middle of the connecting layer 2 corresponding to each inner cavity. Reference Figure 3 As shown, the three-dimensional filter press assembly includes pull rods 6 horizontally radially distributed outside the split tube bag 1. The ends of the pull rods 6 are hinged to symmetrical swing links 13. The ends of each pair of swing links 13 are rotatably provided with deflection links 14. The inner side of the deflection links 14 is connected to a filter press plate 15 that is in close contact with the outer wall of the split tube bag 1. Reference Figure 5 As shown, the filling plate 7 is rotatably disposed above the middle of the split tube bag 1. The split tube bag 1 is flexibly connected to the middle of the top connecting layer 2 with a connecting plate 9 that is connected to the filling tube 18. The filling plate 7 is provided with a filling hole 20 that is intermittently connected to the connecting plate 9. A support frame 8 is installed in the middle of the upper side of the split tube bag 1. A connecting plate 9 is installed in the middle of the support frame 8. The lower end of the connecting plate 9 is connected to an elastic tube 26 corresponding to each injection hole 20. The lower end of the elastic tube 26 is connected to the filling tube 18. A driven gear ring 25 is installed on the upper end of the filling plate 7, and a motor 27 is installed on the side of the upright frame 8 near the driven gear ring 25. The output end of the motor 27 is connected to a drive tooth 11 that meshes with the driven gear ring 25. A feed pipe 10 is rotatably installed on the upper end of the filling plate 7. A mixer connecting pipe 19 for adding conditioning agents is installed on one side of the feed pipe 10. A base 22 is installed at the bottom of the split tube bag 1. A water collection tank 23 for collecting filtrate after pressure filtration is opened on the upper surface of the outer side of the base 22 corresponding to the outer side of the split tube bag 1.

[0022] Basic operating principle: After conditioning, the dredged mud enters the feed pipe 10 and then flows into the internal cavity of the injection plate 7, which is rotatably connected to the feed pipe 10. The motor 27 outputs power to drive the drive gear 11 to rotate. Through gear meshing, the driven gear ring 25 and the injection plate 7 rotate synchronously around their own axis, so that the single injection hole 20 on the injection plate 7 is intermittently connected to the interface of the corresponding three internal cavities on the connecting plate 9. The mud is sequentially filled into the three inner cavities of the split tube bag 1 from top to bottom through the elastic connecting pipe 26 and the filling pipe 18. After each inner cavity is filled to the preset safety pressure, the filling plate 7 rotates to switch to the filling pipeline of the next inner cavity. After a certain inner cavity is filled, three sets of hydraulic cylinders 4, which are evenly distributed along the circumference of the split tube bag 1, are started simultaneously. They pull the corresponding pull rods 6 to move horizontally away from the center of the split tube bag 1 along the guide plate 5. The locking bolts 12 at the end of each pull rod 6 drive the swing connecting rods 13, which are symmetrically arranged above and below, to swing towards the center. This, in turn, pulls the deflection connecting rod 14 to drive the filter plate 15 to synchronously press against the outer wall of the corresponding inner cavity of the split tube bag 1 in the radial direction, applying uniform mechanical extrusion force to the mud in the inner cavity from three orthogonal radial directions. During the filter press process, free water and some bound water in the slurry seep out through the pores of the high-strength filter fabric of the split tube bag 1, and flow naturally along the outer wall of the tube bag to the annular water collection tank 23 on the base 22 for unified collection and transportation to the subsequent water treatment system. When the inner cavity is pressed to the preset termination pressure, the oil cylinder 4 moves in the opposite direction, driving the pull rod 6, swing connecting rod 13, deflection connecting rod 14 and filter plate 15 to reset synchronously. At this time, the filling hole 20 of the filling plate 7 rotates again to switch to the filling interface of the inner cavity for secondary filling. The three inner cavities cycle in sequence to carry out the continuous operation process of filling-pressing-refilling, realizing the uninterrupted operation of the dredging mud dewatering process.

[0023] This invention upgrades the traditional single self-weight consolidation mode of geotextile bags to a composite consolidation mode combining self-weight load and radial mechanical extrusion through the sequential coordination of segmented filling and radial three-dimensional pressure filtration. This breaks through the safety limitations of traditional integral geotextile bag filling pressure and fundamentally avoids the risk of bag bursting caused by high-pressure integral filling. The alternating operation mode of the three independent inner cavities realizes the continuous operation of the mud dewatering process, which greatly improves the mud processing capacity per unit time and equipment utilization rate. The force mode of three-dimensional uniform radial extrusion enables the consolidation driving force to effectively penetrate the mud layer and be transmitted to the central area of ​​the inner cavity, which completely solves the problem of weak consolidation and layered dewatering of mud in the center of traditional geotextile bags, and improves the overall uniformity and dewatering depth of the solidified soil.

[0024] Example 2: Refer to Figure 1 - Figure 7As shown, this embodiment further optimizes some of the structures according to Embodiment 1: including a split tube bag 1 with longitudinally distributed annular hoops 16 embedded inside, a longitudinal belt 17 connected to the annular hoops 16 being simultaneously embedded inside the split tube bag 1, and a one-way valve 21 installed on the connecting layer 2 inside the split tube bag 1 for one-way conveying of mud from top to bottom; wherein the split tube bag 1 is a high-strength filter fabric and has the technical effect of free water and part of the bound water seeping out, the annular hoops 16 embedded inside the split tube bag 1 and the longitudinal belt 17 are perpendicularly connected to each other to form an integral grid reinforcement skeleton, which limits the radial and axial deformation of the split tube bag 1 during filling and filtration, so that the extrusion pressure applied by the filter plate 15 can be evenly distributed on the entire outer wall surface of the corresponding inner cavity, preventing the filter fabric from tearing and the tube bag from being damaged due to local stress concentration; Reference Figure 6 As shown, the one-way valve 21 installed on the internal connecting layer 2 only allows the mud to flow under the action of the pressure difference from top to bottom. During the filling process of the upper inner cavity, if the local filling pressure exceeds the opening threshold of the one-way valve 21, the excess mud can automatically flow into the lower inner cavity through the one-way valve 21, realizing the automatic balance and adjustment of the filling pressure between the inner cavities. At the same time, during the filtration process of the lower inner cavity, the one-way valve 21 automatically closes, effectively preventing the mud in the lower inner cavity from flowing back to the upper inner cavity.

[0025] Reference Figure 3 As shown, extended pressure plates 24 are installed on both sides of the filter press plate 15. Each set of filter press plates 15 and extended pressure plates 24 are respectively aligned with the middle of each inner cavity in the horizontal direction. The extended pressure plates 24 on both sides of the filter press plate 15 are spliced ​​together with the filter press plate 15 to form a complete extrusion surface that matches the corresponding inner cavity. The center of the extrusion surface is horizontally aligned with the axial center of the corresponding inner cavity, ensuring that the radial extrusion force can evenly cover the entire axial range of the inner cavity and avoid dead corner areas where the mud dewatering is insufficient at the axial end.

[0026] A mounting bracket 3 and a guide plate 5 of the same diameter are installed on the outer side of the split-type filter bag 1 from the outside to the inside. A hydraulic cylinder 4 is horizontally installed on the inner side of the mounting bracket 3. The output end of the hydraulic cylinder 4 is connected to a pull rod 6. The end of the pull rod 6, which passes through the guide plate 5, is connected to a locking bolt 12 that is rotatably connected to the swing linkage 13. The movement of the three-way filter press assembly driven by the hydraulic cylinder 4 is as follows (refer to...). Figure 7 As shown): The cylinder 4 pulls the corresponding lever 6 to move horizontally away from the center of the split tube bag 1 along the guide plate 5. The locking bolts 12 at the end of each lever 6 drive the swinging connecting rods 13 arranged symmetrically above and below to swing towards the center, thereby pulling the deflection connecting rod 14 to drive the filter plate 15 to synchronously adhere to and squeeze the corresponding inner cavity outer wall of the split tube bag 1 in the radial direction, forming a three-way squeezing and filtration action.

[0027] Example 3: This example combines the technical content of Example 1 and Example 2 to form the following deep filtration and dewatering method suitable for dredged and solidified soil, including the following steps: Step 1: Mud pretreatment. The raw mud generated from river dredging is transported to the front-end mixer. Flocculants, coagulants and other conditioning agents are quantitatively added into the mixer through the mixer connection pipe 19, and then injected through the feed pipe 9. Step 2: Segmented intermittent filling. Start motor 27 to drive filling plate 7 to rotate at a set speed, so that the filling hole 20 on filling plate 7 first connects with the interface of the connecting plate 9 corresponding to the uppermost inner cavity. The pretreated mud is filled into the uppermost inner cavity through feed pipe 10, filling plate 7, elastic connecting pipe 26 and filling pipe 18. When the filling pressure reaches the first preset value, filling plate 7 rotates to switch to the middle inner cavity for filling. Similarly, after the middle inner cavity is filled to the first preset value, it switches to the lowermost inner cavity for filling. Step 3: Cyclic three-dimensional pressure filtration. After the uppermost inner cavity is filled, the three sets of hydraulic cylinders 4 in the corresponding radial direction are activated simultaneously. Pulling the pull rod 6 drives the swing connecting rod 13 and the deflection connecting rod 14 to move along the preset trajectory, so that the filter plate 15 and the extended pressure plate 24 synchronously fit and squeeze the inner cavity, applying stable radial mechanical pressure for pressure filtration and dewatering. The seeping filtrate flows along the outer wall of the split tube bag 1 into the water collection tank 23 on the base 22 for unified collection and treatment. When the pressure filtration reaches the second preset pressure, the hydraulic cylinder 4 moves in the opposite direction to drive the three-dimensional pressure filtration assembly to reset. At this time, the filling plate 7 rotates to the next inner cavity interface for secondary filling, repeating the above filling-pressure filtration cycle. The three inner cavities alternately perform filling and pressure filtration operations until all the sludge to be treated is completely dewatered, and finally the dredged and solidified soil with a moisture content that meets the engineering requirements is obtained.

[0028] In summary: On the one hand, the multi-chamber segmented filling design of the split geotextile bag 1, combined with the radial mechanical extrusion of the three-dimensional pressure filter assembly, constructs a composite consolidation system that combines self-weight and mechanical force. This effectively solves the problems of insufficient consolidation driving force, weak consolidation in the central area, and layered dewatering in traditional geotextile bags, improving the dewatering depth and uniformity of dredged and solidified soil, while avoiding the risk of bag bursting during overall high-pressure filling. On the other hand, the intermittent connection structure between the injection plate 7 and the connecting plate 9 enables automatic switching filling of multiple chambers. Combined with the alternating filling-pressure filter cycle mode of the three inner chambers, continuous operation of the dredged mud dewatering process is achieved, improving the processing efficiency and equipment utilization rate of the device.

[0029] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. An integrated deep filtration and dewatering device suitable for dredging and solidifying soil, characterized in that, include: The split tube bag (1) is divided into at least three inner cavities by a detachable connecting layer (2), and the volume of each inner cavity gradually decreases from top to bottom. The split tube bag (1) is fitted with a filling tube (18) for mud injection through the middle of the connecting layer (2) corresponding to each inner cavity. The three-dimensional filter press assembly includes pull rods (6) that are horizontally radially distributed outside the split tube bag (1). The ends of the pull rods (6) are hinged to swinging rods (13) that are symmetrically connected. The ends of each pair of swinging rods (13) are rotatably provided with deflection rods (14). The inner side of the deflection rods (14) is connected to a filter press plate (15) that is in close contact with the outer wall of the split tube bag (1). The filling plate (7) is rotatably disposed above the middle of the split tube bag (1). The split tube bag (1) is flexibly connected to the middle of the top connecting layer (2) with a connecting plate (9) that is connected to the filling tube (18). The filling plate (7) has an filling hole (20) that is intermittently connected to the connecting plate (9).

2. The integrated deep filtration and dewatering device for dredged and solidified soil as described in claim 1, characterized in that, A support frame (8) is installed in the middle of the upper side of the split tube bag (1). The connecting plate (9) is installed in the middle of the support frame (8). The lower end of the connecting plate (9) is connected to an elastic tube (26) for each injection hole (20). The lower end of the elastic tube (26) is connected to the filling tube (18).

3. The integrated deep filtration and dewatering device for dredged and solidified soil according to claim 2, characterized in that, The upper end of the injection plate (7) is equipped with a driven gear ring (25), and a motor (27) is installed on the side of the stand (8) near the driven gear ring (25). The output end of the motor (27) is connected to a drive tooth (11) that meshes with the driven gear ring (25).

4. The integrated deep filtration and dewatering device for dredged and solidified soil according to claim 3, characterized in that, The upper end of the filling plate (7) is rotatably equipped with a feed pipe (10), and a mixer connecting pipe (19) for adding conditioning agents is installed on one side of the feed pipe (10).

5. The integrated deep filtration and dewatering device for dredged and solidified soil according to claim 1, characterized in that, The split tube bag (1) is fitted with a longitudinally distributed annular hoop (16), and the split tube bag (1) is simultaneously fitted with a longitudinal belt (17) connected to the annular hoop (16). A one-way valve (21) is installed on the connecting layer (2) inside the split tube bag (1) for one-way conveying of mud from top to bottom.

6. The integrated deep filtration and dewatering device for dredged and solidified soil according to claim 1, characterized in that, The bottom of the split tube bag (1) is equipped with a base (22), and the base (22) has a water collection tank (23) for collecting the filtrate after pressure filtration on the upper surface of the outer side of the split tube bag (1).

7. The integrated deep filtration and dewatering device for dredged and solidified soil according to claim 1, characterized in that, The outer side of the split tube bag (1) is equipped with a mounting bracket (3) and a guide plate (5) of the same diameter from the outside to the inside. The inner side of the mounting bracket (3) is equipped with a hydraulic cylinder (4) horizontally. The output end of the hydraulic cylinder (4) is connected to the pull rod (6). The end of the pull rod (6) that passes through the guide plate (5) is connected to a locking bolt (12) that is rotatably connected to the swing linkage (13).

8. The integrated deep filtration and dewatering device for dredged and solidified soil according to claim 1, characterized in that, Both sides of the filter press plate (15) are equipped with extension plates (24), and each set of filter press plates (15) and extension plates (24) corresponds to the middle of each inner cavity in the horizontal direction.

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