Dredging equipment in limited offshore space and working method thereof

Abstract

The invention discloses desilting equipment in an offshore limited space and a working method thereof.The desilting equipment comprises a ship body, a winch, a steel wire rope and a dredge pump, the winch is installed on the ship body and lifts the dredge pump into water through the steel wire rope, an outlet of the dredge pump is connected with a dredge pipe, and the other end of the dredge pipe is installed on the ship body in an extending mode; the ship body is provided with a dewatering device, the dewatering device comprises a box body, a first-stage dewatering assembly and a second-stage dewatering assembly, the top of the box body is provided with a feeding port, the upper end of the sludge discharge pipe is installed on the feeding port and communicated with the interior of the box body, and the first-stage dewatering assembly and the second-stage dewatering assembly are sequentially arranged below the feeding port; the device is compact in structure and reasonable in design, dewatering and desilting equipment cooperatively works, dewatering can be completed while silt is sucked, the size and weight of the dewatered silt are greatly reduced, the space and cost required by transportation are reduced, frequent shore unloading is not needed, and the overall desilting efficiency is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of dredging and dehydration, in particular to a dredging device in a limited space at sea and a working method thereof. Background Art

[0002] In offshore engineering, silt cleaning is a common task, especially in limited spaces such as offshore platforms and docks. People now generally use dredging ships to carry out dredging work. There are many dredging methods for existing dredging ships, such as bucket type, jet suction type, mechanical suction type, hydraulic suction type and rake suction type. However, after the existing dredging ships collect the silt on board, they do not further process the silt, but store the silt in the silt tank. Since the silt contains a large amount of seawater, the silt tank will be easily filled, resulting in the dredging ship frequently docking for unloading, and the single effective load only accounts for 30%-50% of the tank capacity, which seriously affects the silt cleaning efficiency. Summary of the invention

[0003] The object of the present invention is to provide a dredging device in a limited space at sea and a working method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a dredging device in a limited space at sea, comprising a hull, a winch, a wire rope and a dredge suction pump, wherein the winch is installed on the hull, and the winch lifts the dredge suction pump through the wire rope and puts it into the water, the outlet of the dredge suction pump is connected with a dredge discharge pipe, and the other end of the dredge discharge pipe is extended and installed on the hull, a dehydration device is installed on the hull, and the dehydration device comprises a box body, a primary dehydration component and a secondary dehydration component, a feed inlet is arranged on the top of the box body, the upper end of the dredge discharge pipe is installed on the feed inlet and communicated with the inside of the box body, and a primary dehydration component and a secondary dehydration component are arranged in sequence below the feed inlet; The primary dewatering assembly includes 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 drum on the corresponding side. Water guide grooves are arranged below the sieve drums on both sides, and water filtered into 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 pressure filtration.

[0005] Furthermore, 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, the feed port is located directly below the channel, the filter plates on both sides are respectively arranged at the left and right ends inside the dehydration box, 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 back ends of the dehydration box, the pressure plate is slidably arranged on the guide rod and is threadedly connected to the first screw rod, the first screw rod is transmission-connected to the second motor, thereby driving the pressure plate to perform horizontal reciprocating motion through the second motor, mud discharge ports are provided on the left and right sides of the bottom end of the dehydration box, each mud discharge port is respectively located on the inner side of the filter plate on the corresponding side, a sealing door is hingedly provided 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 compartment through a pipe, and the pipe connection is located on the outer side of the filter plate on the corresponding side.

[0006] Furthermore, 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 telescopic pushing cylinder, a pushing plate and an adjusting plate. The telescopic pushing 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 telescopic pushing 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 sludge 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.

[0007] Furthermore, a second screw rod and a sliding rod are respectively provided 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 provided on the sliding rod, the side end of the moving seat is threadedly connected to 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.

[0008] Furthermore, a diversion pipe is provided at the bottom of the feed pipe, and two outlets are provided on the diversion pipe, and the two outlets are respectively facing the material guide plates on both sides. A dispersion pipe is rotatably provided between the feed pipe and the diversion pipe, and a plurality of dispersion rods are provided 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 feed pipe and the top end of the diversion pipe through bearings. A fourth motor is provided on the movable seat, and a gear ring is provided on the outer surface of the dispersion pipe, and a gear meshing with the gear ring for transmission is provided on the output shaft of the fourth motor.

[0009] 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.

[0010] Further, the scraping component includes an adjusting frame, a flexible scraping plate and a tension spring. The adjusting frame is hingedly installed at the top of the water guide groove close to the channel side. A plurality of the tension springs are connected between the lower end of the adjusting frame and the inner wall of the water guide groove. The flexible scraping plate is installed at the upper end of the adjusting frame, and the flexible scraping plate abuts against the surface of the sieve cylinder.

[0011] Further, a fixing frame is installed on the outer wall of the sludge suction pump. A first sludge scraping component and a second sludge scraping component are respectively installed at the left and right ends of the fixing frame. The first sludge scraping component includes a first motor and a first reamer. The first motor is fixedly installed at the left end of the fixing frame and is connected to the first reamer. The second sludge scraping component includes a second motor, a second reamer and an adjusting telescopic cylinder. The second motor is hingedly installed at the right end of the fixing frame and is connected to the second reamer. The fixed end of the adjusting telescopic cylinder is hingedly installed on the fixing frame, and its piston rod is hinged to the second motor to drive the second motor to rotate.

[0012] Further, a filtering component is arranged at the bottom inlet of the sludge suction pump. The filtering component includes a rotating frame, a bracket and a cleaning frame. Filter meshes are arranged at the side end and the bottom end of the bracket. The cleaning frame is in a "U" shape structure. The cleaning frame is located outside the bracket 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 bracket 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.

[0013] Further, the first motor, the second motor and the synchronous belt are all waterproofed, and a sealing housing is connected between the outside of the rotating frame and the first motor.

[0014] The present invention also provides a working method for the dredging equipment described above, including the following steps: S1. The hull moves to the working position, and the sludge suction pump is hoisted and put into the water by the 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 through a primary dehydration component and a secondary dehydration component 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.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 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.

[0016] 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.

[0017] 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.

[0018] 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

[0019] Figure 1 It is a structural schematic diagram of the dredging equipment of the present invention; Figure 2 It is a front view of the dredging equipment of the present invention; Figure 3 for Figure 2 A partial enlarged view of the middle part; Figure 4 for Figure 2 A partial enlarged view of point B in the middle; Figure 5 for Figure 2 A partial enlarged view of the middle C; Figure 6 It is a schematic diagram of the internal structure of the dehydration box of the present invention; Figure 7 It is a schematic diagram of the structure of the sludge suction pump in the present invention; Figure 8 It is a schematic diagram of the filter assembly of the present invention.

[0020] In the figure, box body 1, screen drum 2, guide plate 3, water guide trough 4, dehydration box 5, pressure plate 6, filter plate 7, material through port 8, first screw rod 9, guide rod 10, sealing door 11, first telescopic cylinder 12, pipeline 13, push telescopic cylinder 14, push plate 15, adjustment plate 16, scraper 17, return spring 18, second screw rod 19, slide rod 20, feed pipe 21, diverter pipe 22 , dispersion pipe -23, dispersion rod -24, fourth motor -25, air guide pipe -26, spray hole -27, adjustment frame -28, flexible scraper plate -29, tension spring -30, sludge suction pump -31, fixed frame -32, first motor -33, first reamer -34, second motor -35, second reamer -36, adjusting telescopic cylinder -37, rotating frame -38, bracket -39, cleaning frame -40, filter screen -41, synchronous belt -42. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] like Figures 1 to 8 As shown, a dredging device in a limited space at sea includes a hull, a winch, a wire rope and a dredging pump 31. The winch is installed on the hull. The winch lifts the dredging pump 31 through the wire rope and puts it into the water. The outlet of the dredging pump 31 is connected with a dredging pipe, and the other end of the dredging pipe is extended and installed on the hull. A dehydration device is installed on the hull. The dehydration device includes a box 1, a primary dehydration component and a secondary dehydration component. A feed inlet is provided on the top of the box 1. The upper end of the dredging pipe is installed on the feed inlet and communicated with the inside of the box 1. A primary dehydration component and a secondary dehydration component are sequentially arranged below the feed inlet. The primary dewatering assembly includes two sieve drums 2, which are relatively arranged on the left and right sides of the box body 1, and a channel for sludge to pass through is reserved between the sieve drums 2 on both sides. The sieve drums 2 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 2. The left and right sides of the bottom of the feed port are provided with guide plates 3 with inclined structures, and the bottom ends of the guide plates 3 on both sides are respectively located above the top of the sieve drum 2 on the corresponding side. A water guide trough 4 is provided under the sieve drums 2 on both sides. The water filtered into the sieve holes of the sieve drum 2 can enter the water guide trough 4, and the rear end of the water guide trough 4 is connected to the sewage collection tank in the hull. The bottom of the water guide trough 4 is in a rearward inclined structure. A scraper assembly is provided at one end of the water guide trough 4 close to the channel, and the scraper assembly abuts against 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 trough 4. The sludge passing through the channel falls into the secondary dewatering assembly, and the secondary dewatering assembly performs secondary dewatering on the sludge by pressure filtration. 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 screen drum 2. When the sludge falls on the screen drum 2, part of the muddy water in it will be directly separated out through the sieve holes of the screen drum 2 under the impact force of the fall and the gravity factor, and fall into the water guide trough 4, thereby realizing the preliminary dehydration of the sludge.

[0023] The rotational movement of the sieve drum 2 can evenly distribute the sludge on the surface of the sieve drum 2 to prevent the sludge from accumulating into lumps. The two sieve drums 2 rotate relative to each other. When the sludge enters the channel, it is subjected to a certain mechanical squeezing effect, which further promotes the separation of water from the sludge, and the separated water flows into the water guide trough 4 through the sieve holes.

[0024] In this embodiment, the secondary dehydration component includes a dehydration box 5, a pressure plate 6 and two filter plates 7. A feed port 8 is provided in the middle of the top of the dehydration box 5, and the feed port 8 is located directly below the channel. The filter plates 7 on both sides are respectively arranged at the left and right ends of the dehydration box 5, and the pressure plate 6 is arranged between the filter plates 7 on both sides. The first screw rod 9 and the guide rod 10 are respectively arranged at the front and back ends of the dehydration box 5. The pressure plate 6 is slidably arranged on the guide rod 10 and is threadedly connected with the first screw rod 9. The first screw rod 9 is connected to the second motor in a transmission connection, so that the pressure plate 6 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 5, and each mud discharge port is located on the inner side of the filter plate 7 on the corresponding side. A sealing door 11 is hinged on the mud discharge port, and a valve 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 box 5. The first telescopic cylinder 12 is closed, and the left and right ends of the dewatering box 5 are connected to the sewage collection tank through the pipe 13, and the connection of the pipe 13 is located on the outer side of the filter plate 7 on the corresponding side; the left and right sides of the top of the dewatering box 5 are provided with pushing assemblies, and the pushing assemblies are located above the mud discharge port 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 dewatering box 5 and the piston rod extends through the dewatering box 5. The pushing plate is installed at the end of the piston rod of the pushing telescopic cylinder 14. A scraper 17 is provided at one end of the pushing plate close to the filter plate 7 on the corresponding side. The scraper 17 abuts against the filter plate 7 to scrape off the sludge stuck on the filter plate 7. An adjusting groove is opened at the other end of the pushing plate. The adjusting plate 16 is slidably arranged in the adjusting groove, and a reset spring 18 is connected between the adjusting plate 16 and the adjusting groove; The initial position of the pressing plate 6 is located on the right side of the dewatering box 5. The sludge falls from the feed port 8 into the dewatering box and falls into the space between the pressing plate 6 and the left filter plate 7. When the sludge in the space reaches a certain amount, the first screw 9 rotates to drive the pressing plate 6 to move toward the left filter plate 7, thereby pushing the sludge close to the filter plate 7 and pressing the sludge onto the filter plate 7. Through the continuous pressure of the pressing plate 6, the muddy water in the sludge is squeezed out and flows into the pipe 13 through the filter plate 7. When the pressing plate 6 cannot move further, the pushing telescopic cylinder 14 works to drive the pushing plate down, thereby squeezing the sludge in 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 toward the filter plate When the pressing plate 6 moves, the return spring 18 will be compressed and the adjusting plate 16 will be driven to move, thereby ensuring 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 filtering work is completed, the sealing door 11 is opened, and the sludge falls from the sludge discharge port and is discharged. 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 sludge that continues to fall will enter the space between the pressing plate 6 and the right filter plate 7. When the filtration work on the left is completed, the pressing plate 6 only needs to move to the right to continue the filtration work on the right, so there is no need to stop the material dropping, and continuous work can be achieved.

[0025] In this embodiment, a second screw rod 19 and a sliding rod 20 are respectively provided on the left and right sides of the feed port, the second screw rod 19 is driven to rotate by the third motor, a moving seat is slidably provided on the sliding rod 20, the side end of the moving seat is threadedly connected to the second screw rod 19, a feeding pipe 21 is embedded in the middle of the moving seat, and the mud discharge pipe is connected to the top of the feeding pipe 21, and the third motor drives the moving seat to move back and forth periodically along the length direction of the screen drum 2, a shunt pipe 22 is provided at the bottom of the feeding pipe 21, two outlets are provided on the shunt pipe 22, and the two outlets are respectively facing the guide plates 3 on both sides, a dispersion pipe 23 is rotatably provided between the feeding pipe 21 and the shunt pipe 22, a plurality of dispersion rods 24 are provided 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 shunt pipe 22 through bearings, a fourth motor 25 is provided on the moving seat, a gear ring is provided on the outer surface of the dispersion pipe 23, and a gear meshing with the gear ring is provided on the output shaft of the fourth motor 25; The second screw 19 drives the moving seat to move back and forth periodically along the length direction of the screen drum 2, so that the sludge continuously falls on different positions of the screen drum 2, preventing sludge accumulation and rationally utilizing each position of the screen drum 2 to improve the water filtration efficiency; when the sludge enters the feed pipe 21 from the sludge discharge pipe, the continuously rotating dispersion pipe 23 uses the dispersion rods 24 therein to break up the incoming sludge, which can break up the compacted sludge and make the mud and water mix more evenly, facilitating subsequent filtration work.

[0026] 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.

[0027] 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.

[0028] 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; 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. 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.

[0029] In this embodiment, a filtering component is provided at the bottom inlet of the sludge suction pump 31. The filtering component includes a rotating frame 38, a support frame 39, and a cleaning frame 40. Filter meshes 41 are provided at the side end and the bottom end of the support frame 39. The cleaning frame 40 is in a "U" shape and is located outside the support frame 39 and abuts against the filter meshes 41. The rotating frame 38 is rotatably sleeved on the outer wall of the bottom of the sludge suction pump 31. The support frame 39 is fixedly installed at the bottom end of the rotating frame 38. A synchronous belt 42 is传动连接 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; Through physical interception, the filter meshes 41 block large particulate impurities such as stones, fibers, and waterweeds in the sludge from entering the pump. At the same time, when the first motor 33 works, the synchronous belt 42 drives the cleaning frame 40 to continuously rotate, thereby sweeping the impurities on the filter meshes 41 away to avoid impurity accumulation. By using synchronous transmission of the first motor 33, no additional power is required, reducing costs.

[0030] This embodiment also includes a working method applied to the above-described dredging equipment, which includes the following steps: S1. The hull moves to the working position, and the sludge suction pump 31 is lifted and placed into the water by the winch until it reaches 30 cm - 80 cm below the mud surface; S2. The first motor 33 and the second motor 35 are started to drive the first reamer 34 and the second reamer 36 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 31 and discharged into the box body 1; S3. The discharged slurry is dehydrated successively through a primary dehydration component and a secondary dehydration component to separate most of the water in the sludge; S4. The dehydrated sludge leaves from the bottom discharge port of the box body 1 and enters the sludge hold for storage. The separated sewage enters the sewage collection hold. The sewage can be directly discharged into the seabed through the water transfer pump, or directly discharged into the sea after purification treatment.

[0031] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within 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 includes 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 drum on the corresponding side. Water guide grooves are arranged below the sieve drums on both sides, and water filtered into 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 pressure filtration.

2. The dredging equipment for limited offshore space according to claim 1, characterized in that: 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.

3. The dredging equipment for limited offshore space according to claim 2, 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.

4. 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.

5. The dredging equipment for limited offshore space according to claim 4, 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.

6. 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.

7. The dredging equipment for a 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.

8. The dredging equipment for 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.

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

10. A working method applied to the dredging equipment according to claim 8, characterized in that: It includes the following steps: S1. The hull is moved to the working position, and the sludge suction pump is lifted by a winch and placed into the water 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 through a primary dehydration component and a secondary dehydration component 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.

Images