A dredging device and its working method in a limited marine space

Abstract

The present invention discloses a dredging device and its working method in a limited marine space, including a hull, a winch, a steel wire rope, and a mud pump. The winch is installed on the hull. The winch hoists the mud pump into the water through the steel wire rope. The outlet of the mud pump is connected with a mud discharge pipe, and the other end of the mud discharge pipe is extended and installed on the hull. A dehydration device is installed on the hull. The dehydration device includes a box body, a primary dehydration component, and a secondary dehydration component. A feed inlet is arranged at the top of the box body. The upper end of the mud discharge pipe is installed on the feed inlet and communicated with the inside of the box body. The primary dehydration component and the secondary dehydration component are sequentially arranged below the feed inlet. The structure of the present invention is compact and reasonably designed. By the collaborative work of the dehydration and dredging devices, dehydration can be completed while dredging. The volume and weight of the dehydrated sludge are greatly reduced, reducing the space and cost required for transportation, and there is no need to frequently dock for unloading, greatly improving the overall dredging efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of dredging and dewatering, and specifically to a dredging device and its working method in a limited space at sea. Background Art

[0002] In marine engineering, silt cleaning is a common task. Especially in limited spaces such as offshore platforms and docks, people generally use dredgers to carry out dredging work now. There are many dredging methods for existing dredgers, such as bucket dredging, jet suction dredging, mechanical cutter suction dredging, hydraulic cutter suction dredging, and trailing suction dredging, etc. However, after the existing dredgers collect the silt onto the ship, they do not further process the silt, but store the silt in the silt hold. Since the silt contains a large amount of seawater, the silt hold is easily filled up, resulting in the dredger having to frequently berth for unloading. The single effective load only accounts for 30% - 50% of the hold capacity, seriously affecting the silt cleaning efficiency. Summary of the Invention

[0003] The purpose of the present invention is to provide a dredging device and its working method in a limited space at sea to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A dredging device in a limited space at sea, including a hull, a winch, a steel wire rope, and a sludge suction pump. The winch is installed on the hull. The winch hoists the sludge suction pump into the water through the steel wire rope. The outlet of the sludge suction pump is connected with a sludge discharge pipe, and the other end of the sludge discharge pipe extends and is installed on the hull. A dewatering device is installed on the hull. The dewatering device includes a box body, a primary dewatering component, and a secondary dewatering component. A feed inlet is provided at the top of the box body. The upper end of the sludge discharge pipe is installed on the feed inlet and is communicated with the inside of the box body. The primary dewatering component and the secondary dewatering component are sequentially arranged below the feed inlet;

[0005] The primary dewatering component includes two sieve drums. The two sieve drums are relatively arranged on the left and right sides inside the box body, and a channel for the silt to pass through is left between the two sieve drums on both sides. The two sieve drums rotate synchronously in opposite directions under the drive of a first motor, and the silt located on the channel is pressed by the rotation of the sieve drums. Inclined guide plates are provided on the left and right sides at the bottom of the feed inlet. The bottom ends of the two guide plates are respectively located above the topmost ends of the corresponding sieve drums on one side. Water guide grooves are provided below the two sieve drums on both sides. The water filtered through the sieve holes of the sieve drums can enter the water guide grooves, and the rear end of the water guide grooves is communicated with the sewage collection tank inside the hull. A scraping component is provided at one end of the water guide groove close to the channel. The scraping component abuts against the outer surface of the sieve drum to scrape off the silt adhering to the surface and prevent the silt from entering the water guide grooves. The silt passing through the channel falls into the secondary dewatering component, and the secondary dewatering component performs secondary dewatering work on the silt by a pressure filtration method.

[0006] Further, the secondary dehydration assembly includes a dehydration tank, a pressing plate and two filter plates. A material passing port is arranged in the middle of the top end of the dehydration tank. The material passing port is located directly below the channel. The two filter plates are respectively arranged at the left and right ends inside the dehydration tank. The pressing plate is arranged between the two filter plates. The front and rear ends inside the dehydration tank are respectively provided with a first lead screw and a guide rod. The pressing plate is slidably arranged on the guide rod and is in threaded connection with the first lead screw. The first lead screw is in transmission connection with a second motor, so that the pressing plate is driven by the second motor to perform horizontal reciprocating motion. Drainage ports are respectively arranged on the left and right sides of the bottom end of the dehydration tank. Each drainage port is located inside the corresponding filter plate on one side. A sealing door is hinged on the drainage port, and a first telescopic cylinder for controlling the opening and closing of the sealing door is connected between the bottom end of the sealing door and the inner wall of the dehydration tank. The left and right ends of the dehydration tank are both communicated with the sewage collection chamber through pipelines, and the pipeline connection is located outside the corresponding filter plate on one side.

[0007] Further, push material assemblies are respectively arranged on the left and right sides of the top of the dehydration tank. The push material assemblies are located above the drainage ports on the same side. Each push material assembly includes a push material telescopic cylinder, a push material plate and an adjusting plate. The push material telescopic cylinder is installed on the top of the dehydration tank and the piston rod penetrates and extends into the dehydration tank. The push material plate is installed at the end of the piston rod of the push material telescopic cylinder. A scraping plate is arranged at one end of the push material plate close to the corresponding filter plate. The scraping plate abuts against the filter plate to scrape the silt adhered to the filter plate. An adjusting groove is arranged at the other end of the push material plate. The adjusting plate is slidably arranged in the adjusting groove, and a return spring is connected between the adjusting plate and the adjusting groove.

[0008] Further, a second lead screw and a slide rod are respectively arranged on the left and right sides of the feed port. The second lead screw is driven to rotate by a third motor. A moving seat is slidably arranged on the slide rod. The side end of the moving seat is in threaded connection with the second lead screw. A feeding pipe is embedded in the middle of the moving seat. The sludge discharge pipe is connected to the top of the feeding pipe. The third motor drives the moving seat to perform periodic reciprocating motion along the length direction of the sieve cylinder.

[0009] Further, a diversion pipe is arranged at the bottom of the feeding pipe. The diversion pipe is provided with two outlets, and the two outlets respectively face the guide plates on both sides. A dispersing pipe is rotatably arranged between the feeding pipe and the diversion pipe. A plurality of dispersing rods are arranged on the inner wall of the dispersing pipe. The upper and lower ends of the dispersing pipe are respectively connected to the bottom end of the feeding pipe and the top end of the diversion pipe through bearings. A fourth motor is arranged on the moving seat. A gear ring is sleeved on the outer surface of the dispersing pipe. A gear meshing and driving with the gear ring is arranged on the output shaft of the fourth motor.

[0010] Furthermore, air guide pipes are arranged in the two sieve cylinders, and the ends of the two air guide pipes are interconnected and connected to an external air source. A plurality of spray holes are arranged at one end of the air guide pipe close to the channel.

[0011] Furthermore, the scraper assembly includes an adjusting frame, a flexible scraper plate and a tension spring. The adjusting frame is hingedly installed at the top of the water guide trough close to the channel side. Several tension springs are connected between the lower end of the adjusting frame and the inner wall of the water guide trough. The flexible scraper plate is installed at the upper end of the adjusting frame, and the flexible scraper plate is in contact with the surface of the screen drum.

[0012] Furthermore, a fixing frame is installed on the outer wall of the mud suction pump, and a first mud reaming assembly and a second mud reaming assembly are installed on the left and right ends of the fixing frame respectively, the first mud reaming assembly includes a first motor and a first reamer, the first motor is fixedly installed on the left end of the fixing frame and is connected to the first reamer, the second mud reaming assembly includes a second motor, a second reamer and an adjustable telescopic cylinder, the second motor is hingedly installed on the right end of the fixing frame and is connected to the second reamer, the fixed end of the adjustable telescopic cylinder is hingedly installed on the fixing frame, and its piston rod is hingedly installed on the second motor, thereby driving the second motor to rotate.

[0013] Furthermore, a filter assembly is provided at the bottom inlet of the mud suction pump, and the filter assembly includes a rotating frame, a bracket and a cleaning frame. The side end and the bottom end of the bracket are provided with filter screens. The cleaning frame is in a "凵"-shaped structure. The cleaning frame is located on the outside of the bracket and abuts against the filter screen. The rotating frame is rotatably sleeved on the bottom outer wall of the mud suction pump, and the bracket is fixedly installed at the bottom end of the rotating frame. A synchronous belt is connected between the rotating frame and the output shaft of the first motor, and the first motor drives the rotating frame to rotate synchronously when the first motor drives the first reamer to rotate.

[0014] Furthermore, the first motor, the second motor and the synchronous belt are all waterproofed, and a sealed housing is connected between the outer side of the rotating frame and the first motor.

[0015] The present invention also provides a working method applied to the above-mentioned dredging equipment, comprising the following steps:

[0016] S1. Move the hull to the working position, use the winch to lift the dredge pump and put it into the water until it reaches 30cm-80cm below the mud surface;

[0017] S2, turning on the first motor and the second motor to drive the first reamer and the second reamer to rotate to twist the soil into mud, and sucking the mud into the mud discharge pipe through the mud suction pump and discharging it into the box;

[0018] S3, the discharged mud passes through the primary dehydration component and the secondary dehydration component in turn for dehydration, and most of the water in the mud is separated;

[0019] S4. The dehydrated sludge leaves from the discharge port at the bottom of the box and enters the sludge tank for storage. The separated sewage enters the sewage collection tank and is discharged back into the sea after treatment.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention has a compact structure and a reasonable design. Through the coordinated work of dehydration and dredging equipment, dehydration can be completed while sludge is sucked. The volume and weight of the dehydrated sludge are greatly reduced, which reduces the space and cost required for transportation. There is no need for frequent docking and unloading, which greatly improves the overall dredging efficiency.

[0022] 2. The rotating design of the screen drum in the present invention enables the sludge to continuously enter the channel and complete dehydration, which can quickly separate the water, reduce the possibility of clogging of the screen holes, realize automatic continuous operation, and improve the processing efficiency.

[0023] 3. The present invention uses the pressure plate and the pusher assembly to work together, which can apply multi-directional and multi-frequency pressure to the sludge to achieve layered extrusion dehydration, and the pusher assembly can peel off the sludge attached to the surface of the filter plate and the pressure plate when moving, reducing the frequency of manual cleaning, and can continuously and efficiently process a large amount of sludge and reduce downtime.

[0024] 4. The design of the movable second mud reaming component of the present invention can flexibly adjust the mud reaming angle, which is suitable for operation in limited spaces such as offshore platforms, docks, and waterways. The design of the filter screen and the cleaning rack can prevent solid impurities from entering the pump body and reduce the risk of clogging. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the dredging equipment of the present invention;

[0026] Figure 2 It is a front view of the dredging equipment of the present invention;

[0027] Figure 3 for Figure 2 A partial enlarged view of the middle part;

[0028] Figure 4 for Figure 2 A partial enlarged view of point B in the middle;

[0029] Figure 5 for Figure 2 A partial enlarged view of the middle C;

[0030] Figure 6 It is a schematic diagram of the internal structure of the dehydration box of the present invention;

[0031] Figure 7 It is a schematic diagram of the structure of the sludge suction pump in the present invention;

[0032] Figure 8Schematic diagram of the filtration component of the present invention.

[0033] In the figure, there are box body - 1, sieve cylinder - 2, material guiding plate - 3, water guiding groove - 4, dewatering tank - 5, pressing plate - 6, filter plate - 7, material passing port - 8, first lead screw - 9, guiding rod - 10, sealing door - 11, first telescopic cylinder - 12, pipeline - 13, material pushing telescopic cylinder - 14, material pushing plate - 15, adjusting plate - 16, scraper - 17, return spring - 18, second lead screw - 19, sliding rod - 20, blanking pipe - 21, shunt pipe - 22, dispersion pipe - 23, dispersion rod - 24, fourth motor - 25, air guide pipe - 26, spray hole - 27, adjusting frame - 28, flexible scraping plate - 29, tension spring - 30, sludge suction pump - 31, fixing frame - 32, first motor - 33, first reamer - 34, second motor - 35, second reamer - 36, adjusting telescopic cylinder - 37, rotating frame - 38, support - 39, cleaning frame - 40, filter screen - 41, synchronous belt - 42. Specific embodiments

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0035] As Figures 1 to 8 shown, a dredging device in a limited space at sea includes a hull, a winch, a steel wire rope, and a sludge suction pump 31. The winch is installed on the hull. The winch hoists the sludge suction pump 31 into the water through the steel wire rope. The outlet of the sludge suction pump 31 is connected with a sludge discharge pipe, and the other end of the sludge discharge pipe extends and is installed on the hull. A dehydration device is installed on the hull. The dehydration device includes a box body 1, a primary dehydration component, and a secondary dehydration component. A feed inlet is arranged at the top of the box body 1. The upper end of the sludge discharge pipe is installed on the feed inlet and is communicated with the inside of the box body 1. The primary dehydration component and the secondary dehydration component are sequentially arranged below the feed inlet;

[0036] The primary dehydration component includes two sieve drums 2, which are relatively arranged on the left and right sides inside the box body 1, and there is a passage for the sludge to pass between the two sieve drums 2 on both sides. The two sieve drums 2 rotate synchronously in opposite directions driven by the first motor, and the sludge located on the passage is pressed by the rotation of the sieve drum 2. Guide plates 3 with an inclined structure are arranged on the left and right sides at the bottom of the feed inlet. The bottom ends of the guide plates 3 on both sides are respectively located above the topmost part of the corresponding sieve drum 2 on one side. Water guide grooves 4 are arranged below the two sieve drums 2. The water filtered through the sieve holes of the sieve drum 2 can enter the water guide groove 4, and the rear end of the water guide groove 4 is communicated with the sewage collection tank inside the ship's body. The bottom of the water guide groove 4 is of an inclined structure towards the rear side. A scraping component is arranged at one end of the water guide groove 4 close to the passage. The scraping component is in contact with the outer surface of the sieve drum 2, so as to scrape off the sludge adhering to the surface and prevent the sludge from entering the water guide groove 4. The sludge passing through the passage falls into the secondary dehydration component, and the secondary dehydration component performs secondary dehydration work on the sludge by means of pressure filtration;

[0037] After the sludge enters the box body 1, it is guided by the guide plate 3 and first falls on the upper part of the sieve drum 2. At the first moment when the sludge falls on the sieve drum 2, part of the muddy water in it will be directly separated by the sieve drum 2 through the sieve holes under the action of the falling impact force and gravity, and fall into the water guide groove 4, thereby realizing the preliminary dehydration of the sludge.

[0038] The rotational movement of the sieve drum 2 can evenly distribute the sludge on the surface of the sieve drum 2, avoiding the accumulation of the sludge into blocks. And the two sieve drums 2 rotate relatively. When the sludge enters the passage, it is subjected to a certain mechanical extrusion effect, which further promotes the separation of water from the sludge, and the separated water flows into the water guide groove 4 through the sieve holes.

[0039] In this embodiment, the secondary dehydration assembly includes a dehydration tank 5, a pressing plate 6 and two filter plates 7. A material passing port 8 is arranged in the middle of the top end of the dehydration tank 5, and the material passing port 8 is located directly below the channel. The two filter plates 7 are respectively arranged at the left and right ends inside the dehydration tank 5. The pressing plate 6 is arranged between the two filter plates 7. A first lead screw 9 and a guide rod 10 are respectively arranged at the front and rear ends inside the dehydration tank 5. The pressing plate 6 is slidably arranged on the guide rod 10 and is threadedly connected to the first lead screw 9. The first lead screw 9 is in transmission connection with a second motor, so as to drive the pressing plate 6 to perform a horizontal reciprocating motion through the second motor. Drainage ports are respectively arranged on the left and right sides of the bottom end of the dehydration tank 5, and each drainage port is located inside the corresponding side of the filter plate 7. A sealing door 11 is hinged on the drainage port, and a first telescopic cylinder 12 for controlling the opening and closing of the sealing door 11 is connected between the bottom end of the sealing door 11 and the inner wall of the dehydration tank 5. The left and right ends of the dehydration tank 5 are both communicated with the sewage collection tank through pipelines 13, and the connection part of the pipelines 13 is located outside the corresponding side of the filter plate 7. Pushing assemblies are respectively arranged on the left and right sides of the top of the dehydration tank 5, and the pushing assemblies are located above the drainage ports on the same side. The pushing assembly includes a pushing telescopic cylinder 14, a pushing plate and an adjusting plate 16. The pushing telescopic cylinder 14 is installed on the top of the dehydration tank 5 and the piston rod extends through and into the dehydration tank 5. The pushing plate is installed at the end of the piston rod of the pushing telescopic cylinder 14. A scraping plate 17 is arranged at one end of the pushing plate close to the corresponding side filter plate 7. The scraping plate 17 abuts against the filter plate 7 to scrape off the silt adhered to the filter plate 7. An adjusting groove is formed at the other end of the pushing plate. The adjusting plate 16 is slidably arranged in the adjusting groove, and a return spring 18 is connected between the adjusting plate 16 and the adjusting groove;

[0040] The initial position of the pressing plate 6 is located on the right side inside the dewatering tank 5. The sludge falls into the dewatering tank from the material passing port 8 and lands in the space between the pressing plate 6 and the left filter plate 7. When the sludge in this space reaches a certain amount, the first lead screw 9 rotates to drive the pressing plate 6 to move towards the left filter plate 7, thereby pushing the sludge closer to the filter plate 7 and pressing the sludge onto the filter plate 7. Through the continuous pressing of the pressing plate 6, the muddy water in the sludge is squeezed out and flows into the pipeline 13 through the filter plate 7. When the pressing plate 6 can no longer move, the pushing material telescopic cylinder 14 works to drive the pushing plate downwards, thereby pressing the sludge from another direction to ensure that the water in the sludge is squeezed out. And due to the movable setting of the adjusting plate 16, when the pressing plate 6 moves towards the filter plate 7, it will compress the return spring 18 and drive the adjusting plate 16 to move, so as to ensure that no matter where the pressing plate 6 moves to, the pushing surface composed of the pushing plate and the adjusting plate 16 can be located between the pressing plate 6 and the filter plate 7; after the squeezing and water filtering work is completed, the sealing door 11 is opened, and the sludge falls and is discharged from the sludge discharge port. At the same time, the pushing plate continues to descend to scrape off the sludge adhering to the pressing plate 6 or the filter plate 7 to ensure that the sludge is completely discharged. And when the pressing plate 6 moves to the left, the continuously falling sludge will enter the space between the pressing plate 6 and the right filter plate 7. When the pressure filtration work on the left is completed, the pressing plate 6 only needs to move to the right to continue the pressure filtration work on the right, so that it is not necessary to stop the feeding and continuous operation can be achieved.

[0041] In this embodiment, a second lead screw 19 and a slide bar 20 are respectively arranged on the left and right sides of the feeding port. The second lead screw 19 is driven to rotate by a third motor. A moving seat is slidably arranged on the slide bar 20. The side end of the moving seat is threadedly connected to the second lead screw 19. A feeding pipe 21 is embedded in the middle of the moving seat. The sludge discharge pipe is connected to the top of the feeding pipe 21. The third motor drives the moving seat to move periodically back and forth along the length direction of the sieve cylinder 2. A diversion pipe 22 is arranged at the bottom of the feeding pipe 21. Two outlets are arranged on the diversion pipe 22, and the two outlets respectively face the guide plates 3 on both sides. A dispersion pipe 23 is rotatably arranged between the feeding pipe 21 and the diversion pipe 22. A plurality of dispersion rods 24 are arranged on the inner wall of the dispersion pipe 23. The upper and lower ends of the dispersion pipe 23 are respectively connected to the bottom end of the feeding pipe 21 and the top end of the diversion pipe 22 through bearings. A fourth motor 25 is arranged on the moving seat. A gear ring is sleeved on the outer surface of the dispersion pipe 23. A gear meshing with the gear ring is arranged on the output shaft of the fourth motor 25;

[0042] The second lead screw 19 drives the moving seat to move periodically back and forth along the length direction of the sieve cylinder 2, so that the sludge continuously falls at different positions of the sieve cylinder 2, preventing the sludge from accumulating and making reasonable use of each position of the sieve cylinder 2 to improve the water filtering efficiency; when the sludge enters the feeding pipe 21 from the sludge discharge pipe, the continuously rotating dispersion pipe 23 uses the dispersion rods 24 inside it to disperse the incoming sludge, which can break up the agglomerated sludge and make the muddy water mix more evenly, facilitating the subsequent filtering work.

[0043] In this embodiment, air ducts 26 are provided in both sieve cylinders 2, and the ends of the two air ducts 26 are interconnected and connected to an external air source. A plurality of spray holes 27 are arranged at one end of the air duct 26 close to the channel. When the external air source delivers gas into the air duct 26, as the gas is sprayed from the spray holes 27, an impact force can be given to the silt blocked in the sieve holes, thereby achieving the effect of unblocking the sieve holes and avoiding blockage of the sieve holes.

[0044] In this embodiment, the scraper assembly includes an adjusting frame 28, a flexible scraper plate 29 and a tension spring 30. The adjusting frame 28 is hingedly installed at the top of the water guide trough 4 close to the channel side. A plurality of tension springs 30 are connected between the lower end of the adjusting frame 28 and the inner wall of the water guide trough 4. The flexible scraper plate 29 is installed at the upper end of the adjusting frame 28, and the flexible scraper plate 29 is in contact with the surface of the screen drum 2. The tension spring 30 exerts a pulling force on the bottom end of the adjusting frame 28, so that the flexible scraper plate 29 is closely in contact with the surface of the screen drum 2. When silt adheres to the surface of the screen drum 2, as the screen drum 2 rotates, the part with silt will contact the flexible scraper plate 29, thereby scraping it off and falling off.

[0045] In this embodiment, a fixing frame 32 is installed on the outer wall of the dredge suction pump 31, and a first mud reaming assembly and a second mud reaming assembly are installed on the left and right ends of the fixing frame 32 respectively. The first mud reaming assembly includes a first motor 33 and a first reamer 34. The first motor 33 is fixedly installed on the left end of the fixing frame 32 and connected to the first reamer 34. The second mud reaming assembly includes a second motor 35, a second reamer 36 and an adjustable telescopic cylinder 37. The second motor 35 is hingedly installed on the right end of the fixing frame 32 and connected to the second reamer 36. The fixed end of the adjustable telescopic cylinder 37 is hingedly installed on the fixing frame 32, and its piston rod is hingedly connected to the second motor 35, thereby driving the second motor 35 to rotate;

[0046] In offshore operation scenarios (such as in jacket piles and narrow waterways), the space is limited. The second reamer 36 can be rotated within a range of 90 degrees by adjusting the telescopic cylinder 37. The 90-degree adjustment capability of the second reamer 36 can cope with complex terrains such as slopes, vertical pile foundations, and narrow ditches. For example, when dredging in offshore jacket piles, the second reamer 36 can go deep into the dead corner of the pile bottom to remove hard sediments in a vertical state; the horizontal state is suitable for stirring shallow silt in a large area.

[0047] At the same time, by adjusting the angle of the second reamer 36, the cutting force can be optimized for sediments of different densities (such as loose silt and compacted clay). For example, in the vertical state, the second reamer 36 has smaller cutting resistance, which is suitable for crushing hard sediment layers; in the horizontal state, the stirring area is increased and the mud fluidity is enhanced.

[0048] In this embodiment, a filter assembly is provided at the bottom inlet of the dredge suction pump 31, and the filter assembly includes a rotating frame 38, a bracket 39 and a cleaning frame 40. The side end and the bottom end of the bracket 39 are provided with a filter screen 41. The cleaning frame 40 is in a "凵"-shaped structure. The cleaning frame 40 is located outside the bracket 39 and abuts against the filter screen 41. The rotating frame 38 is rotatably sleeved on the bottom outer wall of the dredge suction pump 31. The bracket 39 is fixedly installed at the bottom end of the rotating frame 38. A synchronous belt 42 is connected between the rotating frame 38 and the output shaft of the first motor 33. When the first motor 33 drives the first reamer 34 to rotate, the synchronous belt 42 drives the rotating frame 38 to rotate;

[0049] The filter screen 41 prevents large particles of impurities such as stones, fibers, and water plants in the sludge from entering the pump through physical interception. At the same time, when the first motor 33 is working, it will synchronously drive the cleaning frame 40 42 to rotate continuously, thereby sweeping away the impurities on the filter screen 41 to avoid impurity accumulation. The synchronous transmission of the first motor 33 does not require additional power, reducing costs.

[0050] This embodiment also includes a working method applied to the above-mentioned dredging equipment, comprising the following steps:

[0051] S1. The hull is moved to the working position, and the dredge suction pump 31 is hoisted and put into the water by a winch until it reaches 30cm-80cm below the mud surface;

[0052] S2, turning on the first motor 33 and the second motor 35 to drive the first reamer 34 and the second reamer 36 to rotate to twist the soil into mud, and sucking the mud into the mud discharge pipe through the mud suction pump 31 and discharging it into the box 1;

[0053] S3, the discharged mud passes through the primary dehydration component and the secondary dehydration component in turn for dehydration, and most of the water in the mud is separated;

[0054] S4. The dehydrated sludge leaves from the bottom outlet of the box 1 and enters the sludge tank for storage, and the separated sewage enters the sewage collection tank. The sewage can be directly discharged into the seabed through a water pump, or directly discharged to the sea surface after purification.

[0055] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A dredging device in a limited space at sea, comprising a hull, a winch, a wire rope and a dredging pump, wherein the winch is installed on the hull, the winch lifts the dredging pump through the wire rope and puts it into the water, the outlet of the dredging pump is connected to a dredging pipe, and the other end of the dredging pipe is extended and installed on the hull, characterized in that: The hull is provided with a dehydration device, which includes a box, a primary dehydration assembly and a secondary dehydration assembly. A feed inlet is provided on the top of the box, the upper end of the mud discharge pipe is installed on the feed inlet and communicated with the inside of the box, and a primary dehydration assembly and a secondary dehydration assembly are provided in sequence below the feed inlet; The primary dewatering assembly comprises two sieve drums, which are relatively arranged on the left and right sides of the box body, and a channel for sludge to pass through is reserved between the sieve drums on both sides. The sieve drums on both sides rotate synchronously in opposite directions under the drive of the first motor, and the sludge on the channel is pressed by the rotation of the sieve drums. Guide plates with inclined structures are arranged on the left and right sides of the bottom of the feed port, and the bottom ends of the guide plates on both sides are respectively located above the top of the sieve drums on the corresponding sides. Water guide grooves are arranged under the sieve drums on both sides, and water filtered into the water guide grooves by the sieve holes of the sieve drums can enter the water guide grooves, and the rear end of the water guide grooves is connected to the sewage collection tank in the hull. A scraper assembly is arranged at one end of the water guide groove close to the channel, and the scraper assembly abuts against the outer surface of the sieve drum, so as to scrape off the sludge adhering to the surface and prevent the sludge from entering the water guide groove. The sludge passing through the channel falls into the secondary dewatering assembly, and the secondary dewatering assembly performs secondary dewatering on the sludge by filter pressing. The secondary dehydration assembly includes a dehydration box, a pressure plate and two filter plates. A feed port is provided at the middle part of the top of the dehydration box, and the feed port is located directly below the channel. The filter plates on both sides are respectively arranged at the left and right ends of the dehydration box, and the pressure plate is arranged between the filter plates on both sides. A first screw rod and a guide rod are respectively arranged at the front and rear ends of the dehydration box, and the pressure plate is slidably arranged on the guide rod and is threadedly connected with the first screw rod. The first screw rod is transmission-connected to the second motor, so that the pressure plate is driven by the second motor to make horizontal reciprocating motion. Mud discharge ports are provided on the left and right sides of the bottom end of the dehydration box, and each mud discharge port is respectively located on the inner side of the filter plate on the corresponding side. A sealing door is hinged on the mud discharge port, and a first telescopic cylinder for controlling the opening and closing of the sealing door is connected between the bottom end of the sealing door and the inner wall of the dehydration box. The left and right ends of the dehydration box are connected to the sewage collection tank through a pipeline, and the pipeline connection is located on the outer side of the filter plate on the corresponding side.

2. The dredging equipment for limited offshore space according to claim 1, characterized in that: Pushing assemblies are provided on both sides of the top of the dewatering box, and the pushing assemblies are located above the mud discharge port on the same side. The pushing assembly includes a pushing telescopic cylinder, a pushing plate and an adjusting plate. The pushing telescopic cylinder is installed on the top of the dewatering box and the piston rod extends through the dewatering box. The pushing plate is installed at the end of the piston rod of the pushing telescopic cylinder. A scraper is provided at one end of the pushing plate close to the filter plate on the corresponding side, and the scraper abuts against the filter plate to scrape off the silt stuck on the filter plate. An adjusting groove is provided at the other end of the pushing plate, and the adjusting plate is slidably arranged in the adjusting groove, and a return spring is connected between the adjusting plate and the adjusting groove.

3. The dredging equipment for limited offshore space according to claim 1, characterized in that: A second screw rod and a sliding rod are respectively arranged on the left and right sides of the feed port, the second screw rod is driven to rotate by a third motor, a moving seat is slidably arranged on the sliding rod, the side end of the moving seat is threadedly connected with the second screw rod, a feeding pipe is embedded in the middle of the moving seat, the mud discharge pipe is connected to the top of the feeding pipe, and the third motor drives the moving seat to move back and forth periodically along the length direction of the screen drum.

4. The dredging equipment for limited offshore space according to claim 3, characterized in that: A diversion pipe is arranged at the bottom of the feeding pipe, and two outlets are arranged on the diversion pipe, and the two outlets are respectively facing the material guide plates on both sides. A dispersion pipe is rotatably arranged between the feeding pipe and the diversion pipe, and a plurality of dispersion rods are arranged on the inner wall of the dispersion pipe. The upper and lower ends of the dispersion pipe are respectively connected with the bottom end of the feeding pipe and the top end of the diversion pipe through bearings. A fourth motor is arranged on the movable seat, and a gear ring is arranged on the outer surface of the dispersion pipe, and a gear meshing with the gear ring is arranged on the output shaft of the fourth motor.

5. The dredging equipment for limited offshore space according to claim 1, characterized in that: An air guide pipe is arranged in each of the two sieve cylinders, and the ends of the two air guide pipes are interconnected and connected to an external air source. A plurality of spray holes are arranged at one end of the air guide pipe close to the channel.

6. The dredging equipment for limited offshore space according to claim 1, characterized in that: The scraper assembly includes an adjustment frame, a flexible scraper plate and a tension spring. The adjustment frame is hingedly installed at the top of the water guide trough close to the channel side. A plurality of tension springs are connected between the lower end of the adjustment frame and the inner wall of the water guide trough. The flexible scraper plate is installed at the upper end of the adjustment frame, and the flexible scraper plate abuts against the surface of the screen drum.

7. The dredging equipment for a limited offshore space according to claim 1, characterized in that: A fixing frame is installed on the outer wall of the mud suction pump, and a first mud reaming assembly and a second mud reaming assembly are installed on the left and right ends of the fixing frame respectively, the first mud reaming assembly includes a first motor and a first reamer, the first motor is fixedly installed on the left end of the fixing frame and is connected to the first reamer, the second mud reaming assembly includes a second motor, a second reamer and an adjustable telescopic cylinder, the second motor is hingedly installed on the right end of the fixing frame and is connected to the second reamer, the fixed end of the adjustable telescopic cylinder is hingedly installed on the fixing frame, and its piston rod is hingedly installed on the second motor, thereby driving the second motor to rotate.

8. The dredging equipment for limited offshore space according to claim 7, characterized in that: A filtering assembly is provided at the bottom inlet of the sludge suction pump. The filtering assembly includes a rotating frame, a support frame, and a cleaning frame. Filter meshes are provided at the side end and the bottom end of the support frame. The cleaning frame is in a "U" shape and is located outside the support frame and abuts against the filter mesh. The rotating frame is rotatably sleeved on the outer wall of the bottom of the sludge suction pump. The support frame is fixedly installed at the bottom end of the rotating frame. A synchronous belt is传动连接 between the rotating frame and the output shaft of the first motor. When the first motor drives the first reamer to rotate, the rotating frame is synchronously driven to rotate.

9. A working method applied to the dredging equipment according to claim 7, characterized in that: It includes the following steps: S1. The hull moves to the working position, and the sludge suction pump is hoisted into the water by a winch until it reaches 30 cm - 80 cm below the mud surface. S2. The first motor and the second motor are started to drive the first reamer and the second reamer to rotate to绞成泥浆 the soil into slurry, and the slurry is sucked into the discharge pipe by the sludge suction pump and discharged into the box body. S3. The discharged slurry is dehydrated by a primary dehydration assembly and a secondary dehydration assembly in sequence to separate most of the water in the sludge. S4. The dehydrated sludge leaves from the bottom discharge port of the box body and enters the sludge hold for storage, and the separated sewage enters the sewage collection hold and is discharged back into the sea after treatment. It should be noted that there is an unclear expression "绞成泥浆" in the original text, and a more accurate term may need to be determined according to the specific context. The above translation is for reference only.

Images