A cutter head device for a trailing suction dredger

Abstract

The invention relates to a kind of rake head device for drag suction dredger.It includes conical box with rear flange plate, fixed box with front open is installed in the front of conical box, deflection box is arranged in the front of fixed box;Inner grid is installed in the position of intersection of fixed box and conical box;A set of grinding unblocking assembly is installed in both sides of conical box, grinding unblocking assembly includes hydraulic motor, push-pull hydraulic cylinder and reduction box, the output shaft of reduction box is hollow shaft and drive shaft is arranged in the hollow shaft, the rear end of drive shaft is connected with the end of piston rod of push-pull hydraulic cylinder by coupling, grinding head is installed in the front end of drive shaft, the front of drive shaft is located in the shaft hole arranged on the side wall of conical box, grinding head is located in fixed box and window is arranged on inner grid for grinding head to pass through.The invention can eliminate the blockage by starting self-cleaning function when the problem of blockage occurs in rake head device, so that the rake head device can run in effective working state for a long time.

Description

Technical Field

[0001] This invention belongs to the technical field of dredging construction equipment, and in particular relates to a rake head device for a drag suction dredger. Background Technology

[0002] Trailing suction hopper (LTH) dredgers are a type of suction dredger widely used in dredging projects. They operate by sucking in slurry using shovels located on the sides or stern, simultaneously dredging and navigating. A LHT dredger is a large, self-propelled, hopper-type dredger equipped with shovels and a hydraulic suction system. During dredging, the suction pipe is lowered to the riverbed, and the vacuum effect of the slurry pump draws slurry from the riverbed through the shovels and suction pipe into the dredger's hopper. Once the hopper is full, the dredger is raised and navigated to the dumping area where the slurry gate is opened to unload the slurry, or the dredged slurry is directly discharged overboard.

[0003] The current rake head device will experience clogging after a certain period of operation. The clogging may be caused by sludge, debris, and rocks on the bottom of the water. Severe clogging will prevent the rake head from working further, causing the rake suction dredging process to stop. The usual handling method is to lift the rake head above the water surface using a ship-mounted hoist, and use manual labor and machinery to clear the blockage inside the rake head. After clearing, the rake head is lowered back down, and the rake suction dredging operation is restarted.

[0004] The aforementioned structure of the rake head device and the operational method for restoring its suction capacity after clogging negatively impact the dredging process, especially in areas with abundant underwater debris and rocks. Clogging is particularly prevalent in these areas, requiring frequent raising, clearing, and lowering of the rake head, severely affecting the dredging vessel's efficiency, extending the dredging project's duration, and increasing construction costs. Therefore, it is necessary to optimize the structure of the rake head device to address these technical issues. Summary of the Invention

[0005] This invention provides a self-cleaning rake head device for a trailing suction dredger to solve the technical problems existing in the prior art. When a blockage occurs, the self-cleaning function of the rake head is activated to eliminate the internal blockage, so that the rake head device can operate in an effective working state for a long time.

[0006] The technical solution adopted by this invention to solve the technical problems existing in the prior art is as follows: A trailing suction hopper dredger's rake head device includes a conical box with a flange at the rear, a fixed box with an open front is installed at the front of the conical box, a deflecting box is provided at the front of the fixed box, the fixed box and the deflecting box are connected by a pin hinge, and a deflecting hydraulic cylinder is installed between the fixed box and the deflecting box; a crossbeam is installed below the front of the deflecting box, and multiple rake teeth are installed at the bottom of the crossbeam; a device is installed at the junction of the fixed box and the conical box. It is equipped with an inner grid; a set of grinding and unblocking components is installed on each side of the conical box. The grinding and unblocking components include a hydraulic motor, a push-pull hydraulic cylinder and a gearbox. The hydraulic motor provides power input to the gearbox. The output shaft of the gearbox is a hollow shaft and a drive shaft is installed inside the hollow shaft. The rear end of the drive shaft is connected to the piston rod end of the push-pull hydraulic cylinder by a coupling. A grinding head is installed at the front end of the drive shaft. The front part of the drive shaft is located in the shaft hole set on the side wall of the conical box. The grinding head is located in the fixed box and a window for the grinding head to pass through is provided on the inner grid.

[0007] Preferably, the gearbox includes a gearbox body, in which a small gear and a large gear are installed for meshing transmission. The input shaft of the hydraulic motor is connected to the small gear. The hollow output shaft of the gearbox is installed at the center of the large gear and its two ends pass through the gearbox body. A keyway is provided on the inner wall of the hollow output shaft, and a key structure extending in the axial direction is provided on the outer wall of the drive shaft, and the key structure is connected to the aforementioned keyway.

[0008] Preferably, a side base is welded and installed on the side of the conical housing, the gearbox body is bolted and fixed to the side base, the housing of the hydraulic motor is fixedly connected to the gearbox body, and the cylinder body of the push-pull hydraulic cylinder is fixedly connected to the gearbox body.

[0009] Preferably, the grinding head is a truncated cone shape with multiple sets of grinding teeth on the side wall. A connecting shaft hole is provided in the middle of the grinding head, and a keyway is provided on the side wall of the connecting shaft hole. A key structure extending in the axial direction is provided on the outer wall of the front end of the drive shaft, and the key structure is connected to the aforementioned keyway. The connecting shaft hole is a stepped hole, and a locking screw is provided at the front end of the drive shaft.

[0010] Preferably, the inner grille includes multiple vertical grille plates, and multiple horizontal grille plates are provided between the vertical grille plates. The main body of the inner grille is located between two grinding heads, and the window is formed between the inner grille and the box body.

[0011] Preferably, a water tank is installed at the bottom of the conical box and a water outlet is provided at the bottom of the water tank. An internal water injection pipe is installed inside the conical box, and an external water injection pipe is installed at the top of the conical box. The upper end of the internal water injection pipe is connected to the external water injection pipe, and the lower end is connected to the water tank. Side nozzles facing the grinding head are also provided on both sides of the middle part of the internal water injection pipe.

[0012] Preferably, a front plate with a flow guide window is installed at the front of the crossbeam, a front side support is installed on the crossbeam, a swing arm is hingedly installed on the front side support, and an opening and closing hydraulic cylinder is also installed on the deflection box, with the front end of the piston rod of the opening and closing hydraulic cylinder hingedly connected to the rear end of the swing arm; it also includes a front cover plate with a cover plate support for closing the flow guide window, with the front end of the swing arm hingedly connected to the cover plate support.

[0013] Preferably, side plates are welded and installed on both sides of the deflection box, crossbeam and front plate, and multiple side wear-resistant blocks are bolted to the bottom edge of the side plates, and multiple bottom wear-resistant blocks are bolted to the bottom of the water tank.

[0014] Preferably, multiple rake tooth bases are welded and installed at the bottom of the crossbeam, and each rake tooth is installed on the rake tooth base using countersunk bolts.

[0015] Preferably, multiple bottom reinforcing ribs are welded and installed between the bottom of the water tank and the bottom of the conical box, and multiple side reinforcing ribs are welded and installed between the side of the water tank and the side of the conical box and the fixed box.

[0016] The advantages and positive effects of this invention are:

[0017] This invention provides a reasonably designed scraper head device for a trailing suction dredger. Compared with existing scraper head devices, the scraper head device of this invention, by setting up a fixed housing and a deflection housing connected by hinges and installing a deflection hydraulic cylinder between them, can cause the front part of the scraper head device to deflect upward, improving the control flexibility of the scraper head. During the clearing operation, by deflecting the front part of the scraper head at a certain angle, it promotes the outward discharge of internal blockages. By installing two grinding and clearing components on the left and right sides, each consisting of a hydraulic motor, a push-pull hydraulic cylinder, a reduction gearbox, a drive shaft, and a grinding head, during the clearing operation, the push-pull hydraulic cylinder drives the grinding head to move back and forth within the scraper head, disturbing and squeezing the internal blockages, promoting their outward discharge. The hydraulic motor drives the grinding head to rotate, and the grinding head grinds the internal blockages, which is beneficial for breaking down stubborn blockages such as boulders. By installing an internal grid at the junction of the fixed and conical housings, it helps to prevent mud slurry, debris, and boulders from moving into the suction pipe of the trailing suction hopper, thus avoiding blockage of the suction pipe and further pump clogging problems.

[0018] Compared with existing drag suction dredgers, the drag head device of this invention has a self-cleaning function that can be quickly activated when necessary to rapidly clear blockages inside the device. Therefore, unlike existing devices, it eliminates the need to raise the device above the water surface and use manual and mechanical cleaning when blockages occur. This allows the device to operate effectively for extended periods, helping to shorten dredging project durations and reduce construction costs. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0020] Figure 2 This is a structural schematic diagram of the main body of the invention, viewed from below;

[0021] Figure 3 This is a structural schematic diagram of the front part of the main body of the invention, from a top view.

[0022] Figure 4 This is a schematic diagram of the rear structure of the main body of the invention, viewed from the front.

[0023] Figure 5 This is a cross-sectional view of the rear part of the main body of the present invention;

[0024] Figure 6 yes Figure 1 Schematic diagram of the structure of the medium grinding unblocking component;

[0025] Figure 7 yes Figure 6 Schematic diagram of the connection structure between the gearbox and the hydraulic motor;

[0026] Figure 8 yes Figure 6 A schematic diagram of the structure of a medium grinding head.

[0027] In the picture:

[0028] 1. Conical housing; 2. Grinding and unblocking assembly; 2-1. Hydraulic motor; 2-2. Push-pull hydraulic cylinder; 2-3. Gearbox; 2-4. Grinding head; 2-5. Drive shaft; 3. Side base; 4. External water injection pipe; 5. Inner grille; 5-1. Grille longitudinal plate; 5-2. Grille transverse plate; 6. Fixed housing; 7. Rear support; 8. Deflection hydraulic cylinder; 9. Deflection housing; 10. Opening and closing hydraulic cylinder. 11. Cylinder; 12. Front side support; 13. Swing arm; 14. Side plate; 15. Cover plate support; 16. Side wear-resistant block; 17. Rake teeth; 18. Pin shaft; 19. Bottom wear-resistant block; 20. Water tank; 21. Bottom reinforcing rib plate; 22. Side reinforcing rib plate; 23. Shaft hole; 24. Front cover plate; 25. Crossbeam; 26. Front intermediate support; 26. Internal water injection pipe; 26-1. Side nozzle. Detailed Implementation

[0029] To further understand the invention's content, features, and effects, the following embodiments are provided for detailed explanation.

[0030] Please see Figure 1 , Figure 2 and Figure 3 The drag head device for a drag suction dredger of the present invention includes a conical box 1 with a flange at the rear, a fixed box 6 with an open front is installed at the front of the conical box 1, a deflection box 9 is provided at the front of the fixed box 6, the fixed box 6 and the deflection box 9 are hinged together by a pin 17, and a deflection hydraulic cylinder 8 is installed between the fixed box 6 and the deflection box 9.

[0031] The conical box 1, the fixed box 6, and the deflecting box 9 are constructed from thick metal plates. The flange at the rear of the conical box 1 facilitates connection with the suction pipe of the trailing suction hopper. As shown in the figure, the rear edge of the fixed box 6 is continuously welded to the front edge of the conical box 1. Pin holes are provided at the base of the left and right side panels of the fixed box 6, and pin holes are also provided at the base of the left and right side panels of the deflecting box 9. The two sets of pin holes are aligned laterally and each is fitted with a pin 17. Therefore, the deflecting box 9 can rotate around the pin 17 under the action of the deflecting hydraulic cylinder 8, thus allowing the front of the rake head device to open or close.

[0032] A crossbeam 24 is installed at the lower front of the deflection box 9. Multiple rake teeth 16 are installed at the bottom of the crossbeam 24. The rake teeth 16 extend diagonally downwards and backwards. When the rake head device is dragged and moved underwater, the rake teeth 16 embed into the mud surface of the bottom and generate a stirring effect. The loosened mud mixed with the surrounding water flow is sucked into the rake head and finally pumped into the mud hopper of the dredge suction vessel through the mud suction pipe.

[0033] In this embodiment, a rear support 7 is welded and installed at the top center of the fixed box 6, and a front intermediate support 25 is welded and installed at the top center of the crossbeam 24. The rear part of the cylinder body of the deflection hydraulic cylinder 8 is hinged to the rear support 7, and the front end of the piston rod of the deflection hydraulic cylinder 8 is hinged to the front intermediate support 25. By controlling the piston rod of the deflection hydraulic cylinder 8 to perform extension and retraction, the front part of the rake head device is controlled to deflect upward (called rake head opening) or downward (called rake head closing).

[0034] In this embodiment, multiple rake tooth bases are welded and installed at the bottom of the crossbeam 24, and each rake tooth 16 is installed on the rake tooth base using countersunk bolts. Specifically, a groove is provided at the rear of the rake tooth 16, and the front of the rake tooth base is inserted into the groove and fixedly connected by countersunk screws. In this way, the rake tooth 16 can be replaced after wear. The countersunk screw connection can effectively avoid excessive wear on the screws and ensure the operability of disassembly when replacing the rake tooth 16.

[0035] In this embodiment, side plates 13 are welded and installed on both sides of the deflection box 9 and the crossbeam 24, as shown in the figure. The rear of the side plates 13 extends to the root of the side plates of the deflection box 9 and is also provided with pin holes. The purpose of the side plates 13 is to improve the overall structural strength of the deflection box 9. In order to improve the wear resistance of the deflection box 9, in this embodiment, multiple side wear-resistant blocks 15 are bolted to the bottom edge of the side plates 13. The side wear-resistant blocks 15 can be disassembled and replaced.

[0036] An inner grille 5 is installed at the junction of the fixed housing 6 and the conical housing 1. The inner grille 5 is used to prevent debris, stones, etc., exceeding size limits from entering the conical housing 1 and subsequently the suction pipe, causing blockages or pump clogging. Please refer to [link to relevant documentation]. Figure 4 and Figure 5 As can be seen, the inner grid 5 includes multiple grid longitudinal plates 5-1, and multiple grid transverse plates 5-2 are provided between the grid longitudinal plates 5-1. The upper and lower ends of each grid longitudinal plate 5-1 are welded and fixed to the rear edge of the top wall and the rear edge of the bottom wall of the fixed box 6. The left and right ends of each grid transverse plate 5-2 are welded and fixed to the grid longitudinal plates 5-1 on both sides respectively. A grid hole is formed between the adjacent grid longitudinal plates 5-1 and grid transverse plates 5-2 to allow the mud to pass through.

[0037] A set of grinding and unblocking components 2 is installed on each side of the conical housing 1. These components enhance the grinding, extrusion, and unblocking functions, and are typically activated when the rake head device experiences blockage. Please refer to [link / reference]. Figure 6 , Figure 7 and Figure 8 As can be seen, the grinding and unblocking assembly 2 consists of a pressure motor 2-1, a push-pull hydraulic cylinder 2-2, a reduction gearbox 2-3, a drive shaft 2-5, and a grinding head 2-4. The assembly consisting of the pressure motor 2-1, the push-pull hydraulic cylinder 2-2, and the reduction gearbox 2-3 is installed on the outside of the conical housing 1, the drive shaft 2-5 passes through the side wall of the conical housing 1, and the grinding head 2-4 is located inside the housing.

[0038] like Figure 1 and Figure 4As shown, the main body of the inner grille 5 is located between the two grinding heads 2-4. Two windows are formed between the inner grille 5 and the housing, and the two grinding heads 2-4 are located in these two windows respectively. When the grinding and unblocking assembly 2 is running, the grinding head 2-4 moves back and forth in the window. When the grinding head 2-4 moves to the front end position, its front end enters the inner cavity of the deflection housing 9. When the grinding head 2-4 moves to the rear end position, its main body is located inside the conical housing 1 and its front is still located in the window.

[0039] Please see Figure 6 , Figure 7 and Figure 8 It can be seen that:

[0040] The grinding and unblocking assembly 2 includes a hydraulic motor 2-1, a push-pull hydraulic cylinder 2-2, and a reduction gearbox 2-3. The hydraulic motor 2-1 provides power input to the reduction gearbox 2-3. The output shaft of the reduction gearbox 2-3 is a hollow shaft, and a drive shaft 2-5 is installed inside the hollow shaft. The rear end of the drive shaft 2-5 is connected to the piston rod end of the push-pull hydraulic cylinder 2-2 by a coupling. In this way, the hydraulic motor 2-1 can drive the drive shaft 2-5 to rotate, and the push-pull hydraulic cylinder 2-2 can drive the drive shaft 2-5 to rotate and move back and forth. The two actions do not affect each other and can be operated separately. The coupling, while combining the drive shaft 2-5 and the piston rod of the push-pull hydraulic cylinder 2-2 into one unit, ensures that there can be flexible relative rotation between the drive shaft 2-5 and the piston rod of the push-pull hydraulic cylinder 2-2.

[0041] The grinding head 2-4 is installed at the front end of the drive shaft 2-5, and the front part of the drive shaft 2-5 is located in the shaft hole 22 provided on the side wall of the tapered housing 1.

[0042] In this embodiment, the reduction gearbox 2-3 includes a reduction gearbox body, in which a small gear and a large gear are installed for meshing transmission. The input shaft of the hydraulic motor 2-1 is connected to the small gear. The hollow output shaft of the reduction gearbox 2-3 is installed at the center of the large gear and its two ends pass through the reduction gearbox body. A keyway is provided on the inner wall of the hollow output shaft. A key structure extending in the axial direction is provided on the outer wall of the drive shaft 2-5, and the key structure is connected to the aforementioned keyway.

[0043] Specifically, the gearbox includes a rear housing and a front housing, which are bolted together. Two sets of bearing seats are installed between the rear and front housings. The pinion gear is installed between one set of bearing seats, and the gear is installed between the other set. The pinion gear has a square shaft hole, and the square output shaft of the hydraulic motor 2-1 is inserted into this square shaft hole. Because the key structure on the drive shaft 2-5 has a certain length, when the push-pull hydraulic cylinder 2-2 moves the drive shaft 2-5 back and forth, the rotation of the gear can still be transmitted to the drive shaft 2-5 because the key structure and the keyway of the hollow output shaft remain in contact.

[0044] In this embodiment, a side base 3 is welded and installed on the side of the conical box 1. The gearbox of the grinding and unblocking component 2 is bolted and fixed to the side base 3. The housing of the hydraulic motor 2-1 is fixedly connected to the gearbox, and the cylinder of the push-pull hydraulic cylinder 2-2 is fixedly connected to the gearbox.

[0045] In this embodiment, as Figure 8 As shown, the grinding head 2-4 is a truncated cone shape with multiple sets of grinding teeth on its sidewall. A connecting shaft hole is provided in the middle of the grinding head 2-4, and a keyway is provided on the sidewall of the connecting shaft hole. A key structure extending in the axial direction is provided on the outer wall of the front end of the drive shaft 2-5, and the key structure is connected to the aforementioned keyway. The connecting shaft hole is a stepped hole, and a locking screw is provided at the front end of the drive shaft.

[0046] Specifically, a threaded hole is provided at the front end of the drive shaft 2-5, and the locking screw is located in the threaded hole with the head part pressed against the edge of the stepped hole of the drive shaft 2-5 to achieve axial fixation of the grinding head 2-4. Due to the cooperation between the aforementioned key structure and keyway, the rotation of the drive shaft 2-5 is transmitted to the grinding head 2-4.

[0047] A water tank 19 is installed at the bottom of the conical box 1, and a water outlet is provided at the bottom of the water tank 19. An internal water injection pipe 26 is installed inside the conical box 1, and an external water injection pipe 4 is installed at the top of the conical box 1. The upper end of the internal water injection pipe 26 is connected to the external water injection pipe 4, and the lower end is connected to the water tank 19. Side nozzles 26-1 facing the grinding head 2-4 are also provided on both sides of the middle part of the internal water injection pipe 26.

[0048] The function of the water injection assembly consisting of the external water injection pipe 4, the internal water injection pipe 26, and the water tank 19 is as follows: the surrounding water is drawn by an external water supply pipeline and a water pump, and after being pressurized, it is injected into the internal water injection pipe 26 through the external water injection pipe 4. Some of the water flows into the water tank 19 and is sprayed downward from the bottom outlet, while some of the water flows out through the side nozzles 26-1 to the grinding heads 2-4 on both sides. The downward spraying water promotes the mixing of the mud surface at the bottom with the water to form mud, and the water sprayed to both sides has a flushing effect on the grinding heads 2-4 on both sides, which can promote the removal of the mud adhering to the surface of the grinding heads 2-4 during the unblocking process, keeping the grinding heads 2-4 clean, which helps to maintain the grinding effect.

[0049] In this embodiment, multiple bottom wear-resistant blocks 18 are bolted to the bottom of the water tank 19. The bottom wear-resistant blocks 18 are used to prevent wear caused by friction between the bottom of the water tank 19 and the muddy surface of the bottom. As shown in the figure, the bottom wear-resistant blocks 18 have water holes. After the bottom wear-resistant blocks 18 are installed and fixed, the water holes are aligned with the water outlet at the bottom of the water tank 19 to ensure that the water in the water tank 19 is sprayed out smoothly. The bottom wear-resistant blocks 18 are replaced after excessive wear.

[0050] A front plate with a flow guide window is installed at the front of the crossbeam 24. A front side support 11 is installed on the crossbeam 24. A swing arm 12 is hinged on the front side support 11. An opening and closing hydraulic cylinder 10 is also installed on the deflection box 9. The front end of the piston rod of the opening and closing hydraulic cylinder 10 is hinged to the rear end of the swing arm 12. It also includes a front cover plate 23 with a cover plate support 14 for closing the flow guide window. The front end of the swing arm 12 is hinged to the cover plate support 14.

[0051] like Figure 1 and Figure 3 As shown, two sets of opening and closing hydraulic cylinders 10, front side supports 11, and swing arms 12 are provided. The rear end of the opening and closing hydraulic cylinder 10 is hinged to the front support welded to the deflection box 9, and the inner edge of the front cover plate 23 is hinged to the front of the crossbeam 24. When the piston rod of the opening and closing hydraulic cylinder 10 extends synchronously, the swing arm 12 drives the front cover plate 23 to flip downward through the cover plate support 14. When it reaches the end position, it closes the guide window on the front plate. When the piston rod of the opening and closing hydraulic cylinder 10 retracts synchronously, the swing arm 12 drives the front cover plate 23 to flip upward through the cover plate support 14, opening the guide window. When the guide window is open, under the action of the internal negative pressure environment, the external water flow can enter the rake head device in large quantities and quickly, which can generate a strong flushing effect on the inside. This is conducive to the mixing of mud generated by the rake teeth 16 with the water flow to form a highly fluid mud. At the same time, fully opening the guide window can alleviate the internal blockage problem through the impact of the water flow.

[0052] In this embodiment, a plurality of bottom reinforcing ribs 20 are welded and installed between the bottom of the water tank 19 and the bottom of the conical box 1, and a plurality of side reinforcing ribs 21 are welded and installed between the side of the water tank 19 and the side of the conical box 1 and the fixed box 6. By setting the aforementioned bottom reinforcing ribs 20 and side reinforcing ribs 21, the overall structural strength of the rake head device can be significantly improved.

[0053] Work style:

[0054] The hydraulic motors 2-1, push-pull hydraulic cylinders 2-2, deflection hydraulic cylinders 8, and two opening and closing hydraulic cylinders 10 of the two grinding and unblocking components 2 of this rake head device are all connected to the hydraulic station of the trailing suction hopper. When carrying out the trailing suction dredging operation, the trailing suction hopper lowers the rake head device and the suction pipe, with the rake head device located on the mud surface at the bottom of the water.

[0055] The trailing suction hopper voyages along the set trailing suction hopper construction path, with the rake head device dragging and moving on the mud surface at the bottom of the water. Under normal construction conditions, by controlling the opening and closing hydraulic cylinder 10, the front cover plate 23 is rotated at a certain angle to open the flow window. The mud pump generates a negative pressure suction effect through the mud suction pipe. The mud blocks broken by the rake teeth 16 are mixed with the water flow entering through the flow window to form mud slurry. The mud slurry is transported to the mud tank of the trailing suction hopper through the mud suction pipe.

[0056] When the rake head becomes clogged (the clog is determined by monitoring the mud flow rate in the suction pipe), the operating power of the mud pump is reduced (but not completely stopped). The front of the rake head device is flipped upwards at a certain angle by controlling the deflection hydraulic cylinder 8 (this is called rake head opening). Then, the hydraulic motor 2-1 and the push-pull hydraulic cylinder 2-2 of the grinding and unblocking assembly 2 are operated. Specifically, the piston rod of the push-pull hydraulic cylinder 2-2 is moved slowly back and forth multiple times. At the same time, the hydraulic motor 2-1 drives the grinding head 2-4 to rotate. The blockage inside the rake head device is pushed outward by the grinding head 2-4, and the grinding head 2-4 grinds the blockage, accelerating the removal of mud blocks, stones, and other blockages.

[0057] During the operation of the trailing suction hopper dredger, the vessel's water pump operates at low power. At this time, water surrounding the scraper head is injected into the internal water injection pipe 26 via the external water injection pipe 4, maintaining a certain water pressure inside the internal water injection pipe 26. This prevents mud from entering the internal water injection pipe 26. Simultaneously, the water jets from the side nozzles 26-1 mix with the mud inside the scraper head, improving its fluidity. Water jets from the bottom of the water tank 19 agitate the mud surface at the bottom and accelerate the mixing of mud and water. During the unblocking operation, the unblocking assembly is ground. During the operation of component 2, the operating power of the trailing suction hopper pump is increased. At this time, the water flow into the external water injection pipe 4 and the internal water injection pipe 26 increases and the flow velocity increases. The water flow into the fixed box 6 also increases and the flow velocity increases. This part of the water flow rushes out of the fixed box 6, which has an outward flushing effect on the blockage and accelerates the discharge of the blockage. At the same time, the grinding head 2-4 is flushed by the aforementioned water flow, and its surface is not easy to adhere to mud. After the blockage is cleared, the grinding head 2-4 is reset to its original position, and the water pump returns to low power operation after a certain period of time when the grinding head 2-4 is reset.

[0058] After the blockage is cleared, the rake head device is closed by controlling the deflection hydraulic cylinder 8, which increases the operating power of the mud pump to high power and restarts the normal rake suction operation mode.

Claims

1. A scraper head device for a trailing suction dredger, characterized in that: The enclosure includes a conical box (1) with a flange at the rear, a fixed box (6) with an open front end installed at the front of the conical box (1), a deflection box (9) at the front of the fixed box (6), the fixed box (6) and the deflection box (9) being hinged together by a pin (17), a deflection hydraulic cylinder (8) being installed between the fixed box (6) and the deflection box (9); a crossbeam (24) being installed below the front of the deflection box (9), and multiple rake teeth (16) being installed at the bottom of the crossbeam (24); an inner grille (5) being installed at the junction of the fixed box (6) and the conical box (1); and a set of grinding and unblocking components (2) being installed on each side of the conical box (1) for grinding and unblocking. Component (2) includes a hydraulic motor (2-1), a push-pull hydraulic cylinder (2-2), and a gearbox (2-3). The hydraulic motor (2-1) provides power input to the gearbox (2-3). The output shaft of the gearbox (2-3) is a hollow shaft and a drive shaft (2-5) is provided inside the hollow shaft. The rear end of the drive shaft (2-5) is connected to the piston rod end of the push-pull hydraulic cylinder (2-2) by a coupling. A grinding head (2-4) is installed at the front end of the drive shaft (2-5). The front part of the drive shaft (2-5) is located in the shaft hole (22) set on the side wall of the conical box (1). The grinding head (2-4) is located in the fixed box (6) and a window for the grinding head (2-4) to pass through is provided on the inner grid (5).

2. The trailing head device for a trailing suction hopper dredger as described in claim 1, characterized in that: The gearbox (2-3) includes a gearbox body, in which a small gear and a large gear are installed for meshing transmission. The input shaft of the hydraulic motor (2-1) is connected to the small gear. The hollow output shaft of the gearbox (2-3) is installed at the center of the large gear and its two ends pass through the gearbox body. A keyway is provided on the inner wall of the hollow output shaft. A key structure extending in the axial direction is provided on the outer wall of the drive shaft (2-5), and the key structure is connected to the aforementioned keyway.

3. The trailing head device for a trailing suction hopper dredger as described in claim 2, characterized in that: in A side base (3) is welded to the side of the conical housing (1). The gearbox body of the gearbox (2-3) is fixed to the side base (3) by bolts. The housing of the hydraulic motor (2-1) is fixedly connected to the gearbox body. The cylinder body of the push-pull hydraulic cylinder (2-2) is fixedly connected to the gearbox body.

4. The trailing head device for a trailing suction hopper dredger as described in claim 3, characterized in that: The grinding head (2-4) is a truncated cone shape with multiple sets of grinding teeth on its sidewall. A connecting shaft hole is provided in the middle of the grinding head (2-4), and a keyway is provided on the sidewall of the connecting shaft hole. A key structure extending in the axial direction is provided on the outer wall of the front end of the drive shaft (2-5), and the key structure is connected to the aforementioned keyway. The connecting shaft hole is a stepped hole, and a locking screw is provided at the front end of the drive shaft (2-5).

5. The trailing head device for a trailing suction hopper dredger as described in claim 4, characterized in that: The inner grille (5) includes multiple grille longitudinal plates (5-1), and multiple grille transverse plates (5-2) are provided between the grille longitudinal plates (5-1). The main body of the inner grille (5) is located between two grinding heads (2-4), and the window is formed between the inner grille (5) and the box body.

6. The trailing head device for a trailing suction hopper dredger as described in claim 5, characterized in that: A water tank (19) is installed at the bottom of the conical box (1) and a water outlet is provided at the bottom of the water tank (19). An internal water injection pipe (26) is installed inside the conical box (1) and an external water injection pipe (4) is installed at the top of the conical box (1). The upper end of the internal water injection pipe (26) is connected to the external water injection pipe (4) and the lower end is connected to the water tank (19). Side nozzles (26-1) facing the grinding head (2-4) are also provided on both sides of the middle part of the internal water injection pipe (26).

7. The trailing head device for a trailing suction hopper dredger as described in claim 6, characterized in that: A front plate with a flow guide window is installed at the front of the crossbeam (24), a front side support (11) is installed on the crossbeam (24), a swing arm (12) is hinged on the front side support (11), and an opening and closing hydraulic cylinder (10) is also installed on the deflection box (9). The front end of the piston rod of the opening and closing hydraulic cylinder (10) is hinged to the rear end of the swing arm (12). It also includes a front cover plate (23) with a cover plate support (14) for closing the flow guide window. The front end of the swing arm (12) is hinged to the cover plate support (14).

8. The trailing head device for a trailing suction hopper dredger as described in claim 7, characterized in that: in Side plates (13) are welded and installed on both sides of the deflection box (9), the crossbeam (24) and the front plate. Multiple side wear-resistant blocks (15) are bolted to the bottom edge of the side plates (13), and multiple bottom wear-resistant blocks (18) are bolted to the bottom of the water tank (19).

9. The trailing head device for a trailing suction hopper dredger as described in claim 8, characterized in that: Multiple rake tooth bases are welded and installed at the bottom of the crossbeam (24), and each rake tooth (16) is installed on the rake tooth base using countersunk bolts.

10. The trailing head device for a trailing suction hopper dredger as described in claim 9, characterized in that: Multiple bottom reinforcing ribs (20) are welded and installed between the bottom of the water tank (19) and the bottom of the conical box (1), and multiple side reinforcing ribs (21) are welded and installed between the side of the water tank (19) and the side of the conical box (1) and the fixed box (6).

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