Active bottom rake leveler for dredging works

Abstract

The application relates to an active water bottom harrower for dredging engineering. The active water bottom harrower comprises a front support, a main frame installed at the rear part of the front support, middle section supports installed at the left and right sides of the main frame, a tail support installed above the rear part of the main frame, two roller supports installed below the rear part of the main frame, end section supports installed at the outer ends of the two middle section supports, support rollers installed on the roller supports, active harrowing assemblies and driving assemblies installed on the tail support, the two middle section supports and the two end section supports, the active harrowing assembly comprises a harrowing cross beam, first base plates and second base plates installed below the two ends of the harrowing cross beam respectively, a harrowing rotating shaft installed between a first shaft seat and a second shaft seat, a harrowing inner rotating cage installed on the harrowing rotating shaft, and harrowing rotary cutters installed outside the harrowing inner rotating cage, and the driving assembly drives the harrowing rotating shaft to rotate. The active water bottom harrower has a reasonable structure design, can actively cut the protrusions on the water bottom mud surface, and guarantees good harrowing construction effect.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of dredging construction equipment, and particularly relates to an active water bottom harrower for dredging engineering. BACKGROUND

[0002] In dredging construction of ports and channels, etc., the dredging effect is improved, the dredging time is shortened, the overdeepening waste area is reduced, and the engineering cost is reduced by using a harrower to drag and sweep the water bottom, which is more obvious for medium dense sand, dense sand, sand mixed with mud, and cohesive soil. The harrower is used in water bottom sweeping construction, which can effectively improve the water bottom flatness and reduce the ridge and groove height difference. The existing harrower generally comprises a structural frame, a scraper is installed on the structural frame, and the harrower is dragged and moved on the water bottom soil by the dragging effect of the ship, the underwater shallow ridge is cut, and the harrowing effect is achieved.

[0003] The harrower with the foregoing structure can be called a passive harrower, which is a harrowing device that produces a harrowing effect under the dragging effect of the ship. The dragging effect provided by the ship is not only used for dragging and moving the harrower, but also for the cutting effect of the harrower on the water bottom soil surface. The foregoing harrower device has the following defects: when the harrower passes through some relatively dense soil surface protrusions (such as soil surface protrusions formed by the foregoing dense sand, sand mixed with mud, and cohesive soil), the soil surface protrusions are usually relatively dense, and the weight of the harrower is limited, so the harrower is usually lifted by the soil surface protrusions, and the harrower slides through the soil surface protrusions from above. At this time, the harrowing effect is not ideal because the soil surface protrusions are not effectively cut, which affects the subsequent construction progress because the water bottom soil surface is not harrowed.

[0004] Therefore, it is necessary to develop and design an active harrower device that can actively cut the water bottom soil surface protrusions, which is applied to the construction scene where the water bottom soil surface is relatively dense, and achieves good harrowing construction effect, and provides conditions for further construction. SUMMARY

[0005] The present application provides an active water bottom harrower for dredging engineering, which has a reasonable structure, can actively cut the water bottom soil surface protrusions, and ensures good harrowing construction effect.

[0006] The technical solution adopted by this invention to solve the technical problems existing in the prior art is as follows: An active underwater leveling device for dredging projects includes a towing front support, a main frame installed at the rear of the towing front support, middle support sections installed on the left and right sides of the main frame, a tail support section installed above the rear of the main frame, a roller support section installed below the rear of the main frame, and a terminal support section installed at the outer ends of the two middle support sections; two supporting rollers are installed on the roller support section; an active leveling component and a drive component are installed on the tail support section, the two middle support sections, and the two terminal support sections; the active leveling component includes a leveling crossbeam, with a first base plate and a second base plate installed below its two ends respectively; a first bearing seat is installed on the first base plate, a second bearing seat is installed on the second base plate; a leveling shaft is installed between the first bearing seat and the second bearing seat; an inner leveling cage is installed on the leveling shaft; leveling cutters are installed outside the inner leveling cage; and the drive component drives the leveling shaft to rotate.

[0007] Preferably, a central bearing is installed below the middle of the leveling beam, and the middle of the leveling shaft is located inside the central bearing; the inner rotating cage of the leveling is installed between the first bearing and the central bearing, and between the second bearing and the central bearing.

[0008] Preferably, the inner rotating cage of the rake is made of metal profiles welded together, and has a cylindrical cage structure. A bushing is welded and installed at the center of the cage structure. The rake rotating shaft is located inside the bushing and is fixedly connected by bolts. The rake roller includes an annular roller cutter holder and cutter teeth arranged in annularly outside the roller cutter holder. The roller cutter holder is sleeved on the inner rotating cage of the rake and fixedly connected by bolts.

[0009] Preferably, the front part of the roller bracket is hinged to the main frame, and a roller bracket hydraulic cylinder is installed between the main frame and the roller bracket.

[0010] Preferably: the front part of the tail support is hinged to the main frame, and a tail support hydraulic cylinder is installed between the main frame and the tail support; the inner end of the middle support is hinged to the main frame, and a swing hydraulic cylinder is installed between the main frame and the middle support; the end support and the middle support are hinged together by a linkage mechanism, and a tilting hydraulic cylinder is installed between the middle support and the end support.

[0011] Preferably, the linkage mechanism includes a first support welded to the outer end of the middle section support and a second support welded to the inner end of the end section support. A first connecting rod is hingedly mounted on the first support, and a second connecting rod is hingedly mounted on the second support. The first connecting rod and the second connecting rod are hingedly connected. A sleeve is installed at the piston rod end of the tilting hydraulic cylinder, and the hinge axis between the first connecting rod and the second connecting rod passes through the sleeve.

[0012] Preferably: the active leveling component installed on the tail support has its leveling crossbeam directly installed and fixed below the rear end of the tail support; the active leveling component installed on the middle support has its leveling crossbeam installed in front of the middle support using an adapter base; the active leveling component installed on the end support has its leveling crossbeam installed behind the end support using an adapter base.

[0013] Preferably, limit chains are installed on both sides of the middle of the front drag support and between the middle of the two middle sections of the support. A support connecting plate is installed in the middle of the front drag support. The front end of the limit chain is connected to the connecting seat on the support connecting plate by a shackle, and the rear end of the limit chain is connected to the connecting seat on the middle section of the support by a shackle.

[0014] Preferably, the drive assembly includes a hydraulic motor and a transmission box fixed to the end of the rake beam of the active rake assembly. A bevel gear set is installed in the transmission box. The axle of one bevel gear in the bevel gear set serves as the input shaft and is connected to the output shaft of the hydraulic motor. The axle of the other bevel gear in the bevel gear set serves as the output shaft and is connected to the end of the rake shaft.

[0015] Preferably, a support beam is provided in the middle of the towing front bracket, and hydraulic lines connecting the swing hydraulic cylinder, roller bracket hydraulic cylinder, tail bracket hydraulic cylinder, tilting hydraulic cylinder and hydraulic motor extend along the support beam to the front end of the towing front bracket.

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

[0017] This invention provides a structurally sound active underwater leveling device for dredging projects. Compared to existing passive leveling devices, the active underwater leveling device of this invention features multiple laterally arranged active leveling components driven by a drive assembly. As the leveling device is towed forward by a vessel, the inner rotating cage of each active leveling component drives the leveling rollers to rotate, actively cutting the mud surface protrusions along the movement path. Compared to existing methods that rely on the towing and pulling action of a vessel to apply a cutting action to the mud surface protrusions, this active underwater leveling device achieves active cutting of the mud surface protrusions, eliminating the need for towing and pulling action from a vessel. Therefore, it provides a better leveling effect on the underwater mud surface and effectively avoids the problem of reduced leveling effect caused by dense mud surface protrusions and the leveling device passing over them.

[0018] By using roller brackets to install support rollers at the rear of the main frame, the rear of the leveler is supported, and it can be smoothly dragged across the bottom mud surface, reducing the resistance encountered during the leveler's movement. Simultaneously, the roller brackets and support rollers elevate the main body of the leveler to a certain height, preventing the active leveling components from being completely pressed against the bottom mud surface or being too far away from it. This ensures a suitable distance between the active leveling components and the bottom mud surface, further guaranteeing the effective peak-shaving and valley-filling construction on the bottom mud surface. Attached Figure Description

[0019] Figure 1 This is a top view of the structure of the present invention;

[0020] Figure 2 This is a three-dimensional structural schematic diagram of the present invention, from a rear view.

[0021] Figure 3 This is a three-dimensional structural schematic diagram of the present invention, from a frontal view;

[0022] Figure 4 yes Figure 1 A schematic diagram of the structure of the intermediate leveling component and the drive component;

[0023] Figure 5 yes Figure 3 A schematic diagram of the structure of the middle section support, the end section support, and the active leveling component.

[0024] In the picture:

[0025] 1. Hydraulic pipeline; 2. Front towing bracket; 3. Bracket connecting plate; 4. Limit chain; 5. Swing hydraulic cylinder; 6. Main frame; 7. Roller bracket hydraulic cylinder; 8. Roller bracket; 9. Tail bracket hydraulic cylinder; 10. Support roller; 11. Tail bracket; 12. Middle section bracket; 13. Tilting hydraulic cylinder; 14. End section bracket; 15. Active leveling assembly; 15-1. Leveling crossbeam; 15-2. First base plate; 15 -3, First bearing seat; 15-4, Middle bearing seat; 15-5, Second base plate; 15-6, Second bearing seat; 15-7, Rake leveling shaft; 15-8, Rake leveling inner rotating cage; 15-9, Rake leveling roller; 16, Drive assembly; 16-1, Hydraulic motor; 16-2, Transmission box; 17, Linkage mechanism; 17-1, First support; 17-2, First connecting rod; 17-3, Second connecting rod; 17-4, Second support. Detailed Implementation

[0026] To further understand the invention's content, features, and effects, the following embodiments are provided for detailed explanation.

[0027] Please see Figure 1 , Figure 2 and Figure 3The active bottom leveling device for dredging projects of the present invention includes a front towing support 2, a main frame 6 installed at the rear of the front towing support 2, middle section supports 12 installed on the left and right sides of the main frame 6, a tail support 11 installed above the rear of the main frame 6, a roller support 8 installed below the rear, and a tail support 14 installed at the outer ends of the two middle section supports 12.

[0028] The towing front support 2 is used by the vessel to tow the active underwater rake. The towing front support 2 is made of welded metal profiles. The main frame 6, located in the middle, connects the towing front support 2, the stern support 11, and the two mid-section supports 12 into a single unit. The main frame 6 is also made of welded metal profiles and is welded to the rear end of the towing front support 2. The mid-section supports 12 and the stern support 14 are both made of welded metal profiles.

[0029] To facilitate connection with the towing cables of the vessel, in this embodiment, multiple towing connection rings can be welded and installed at the front end of the towing front support 2, and the towing cables can be connected to each towing connection ring. To facilitate the lifting and lowering of this underwater leveling device by the crane equipment installed on the vessel, in this embodiment, multiple lifting connection rings can be welded and installed on the upper rear part of the towing front support 2 and the top of the main frame 6, and the lifting cables of the crane equipment can be connected to each lifting connection ring.

[0030] Two support rollers 10 are mounted on the roller bracket 8. Active raking components 15 and drive components 16 are mounted on the tail bracket 11, two middle brackets 12, and two end brackets 14. The two support rollers 10 support the active bottom raking device, ensuring a suitable distance between the bottom of each active raking component 15 and the bottom mud surface. This distance prevents excessive pressure on the mud surface (which would lead to over-cutting) and also prevents excessive distance (which would result in insufficient cutting). As shown in the figure, the two support rollers 10 are flat metal wheels with a certain width (typically 75-100cm) to prevent them from sinking below the mud surface under their own weight during movement. The two support rollers 10 rotate freely as the device moves across the mud surface.

[0031] The drive assembly 16 provides a driving force for the active raking assembly 15. As the underwater raking device moves along the towing path, each active raking assembly 15 continuously cuts the underwater mud surface along the moving path. As shown in the figure, each active raking assembly 15 performs a strip cut. To ensure sufficient cutting effect and no omissions, the cutting strips of adjacent active raking assemblies 15 can overlap by a certain width.

[0032] In this embodiment, the front part of the roller bracket 8 is hinged to the main frame 6, and a roller bracket hydraulic cylinder 7 is installed between the main frame 6 and the roller bracket 8. Thus, by controlling the extension and retraction of the piston rod of the roller bracket hydraulic cylinder 7, the angle between the roller bracket 8 and the main frame 6 can be adjusted, thereby achieving height adjustment of the supporting roller 10. After the underwater leveler is lowered to the bottom, when the piston rod of the roller bracket hydraulic cylinder 7 extends further, the main body of the leveler rises, and correspondingly, the distance between the bottom of each active leveling component 15 and the bottom mud surface increases. Conversely, when the piston rod of the roller bracket hydraulic cylinder 7 retracts, the main body of the leveler descends, and correspondingly, the distance between the bottom of each active leveling component 15 and the bottom mud surface decreases.

[0033] In this embodiment, the front part of the tail support 11 is hinged to the main frame 6, and a tail support hydraulic cylinder 9 is installed between the main frame 6 and the tail support 11; the inner end of the middle support 12 is hinged to the main frame 6, and a swing hydraulic cylinder 5 is installed between the main frame 6 and the middle support 12; the end support 14 and the middle support 12 are hinged to each other by a linkage mechanism 17, and a tilting hydraulic cylinder 13 is installed between the middle support 12 and the end support 14.

[0034] When the piston rod of the hydraulic cylinder 9 of the operating support moves forward and backward, the tail support 11 swings up or down, and the height of the active rake leveling component 15 installed on the tail support 11 changes. When the piston rod of the hydraulic cylinder 9 of the support extends, the height of the active rake leveling component 15 decreases and the distance from the bottom mud surface decreases. When the piston rod of the hydraulic cylinder 9 of the support retracts, the height of the active rake leveling component 15 increases and the distance from the bottom mud surface increases.

[0035] When the piston rod of the swing hydraulic cylinder 5 is operated to extend or retract, the two middle support brackets 12 swing forward or backward. When swinging forward to the end position, the two middle support brackets 12 and their auxiliary parts are folded forward. When swinging backward to the end position, the two middle support brackets 12 and their auxiliary parts are unfolded.

[0036] When the piston rod of the tilting hydraulic cylinder 13 is operated to extend or retract, the two end brackets 14 swing upward or downward. When swinging upward to the end position, the two end brackets 14 and their accessories are folded upward. When swinging downward to the end position, the two end brackets 14 and their accessories are unfolded.

[0037] The aforementioned two swing hydraulic cylinders 5 fold and unfold the two middle section supports 12, and the two tilting hydraulic cylinders 13 fold and unfold the two end section supports 14, giving this active bottom leveler a folding and retractable structural characteristic. It can be fully unfolded during bottom leveling operations and fully folded and retracted when not in operation. This makes it easy to hang the entire active bottom leveler at the stern or side of the ship's facilities with a significantly reduced volume, or to lift it as a whole onto the ship's deck, avoiding excessive space occupation.

[0038] In this embodiment, limiting chains 4 are installed on both sides of the middle of the towing front support 2 and between the middle of the two middle support sections 12. A support connecting plate 3 is installed in the middle of the towing front support 2. The front end of the limiting chain 4 is connected to the connecting seat on the support connecting plate 3 by a shackle, and the rear end of the limiting chain 4 is connected to the connecting seat on the middle support section 12 by a shackle. The function of setting two limiting chains 4 is to pull the two middle support sections 12. When the piston rods of the two swing hydraulic cylinders 5 are fully extended, the two limiting chains 4 are fully tensioned. At this time, the middle support section 12 is simultaneously subjected to the thrust of the swing hydraulic cylinder 5 and the tension of the limiting chains 4, which improves the structural stability of the middle support section 12, and thus improves the structural stability of the underwater rake after deployment.

[0039] Please see Figure 5 It can be seen that:

[0040] The linkage mechanism 17 includes a first support 17-1 welded to the outer end of the middle support 12 and a second support 17-4 welded to the inner end of the end support 14. A first connecting rod 17-2 is hinged to the first support 17-1, and a second connecting rod 17-3 is hinged to the second support 17-4. The first connecting rod 17-2 and the second connecting rod 17-3 are hinged together. A sleeve is installed at the end of the piston rod of the tilting hydraulic cylinder 13, and the hinge axis between the first connecting rod 17-2 and the second connecting rod 17-3 passes through the sleeve.

[0041] Figure 5 The diagram shows the fully extended state. When it is necessary to fold the end bracket 14 and its associated components, the piston rod of the flipping hydraulic cylinder 13 is fully retracted. Then, the first connecting rod 17-2 rotates inward around the hinge axis with the first support 17-1, and the second connecting rod 17-3 pulls the second support 17-4 and the end bracket 14 inward. Finally, the end bracket 14 flips over to the top of the middle bracket 12, and the active leveling component 15 is located above the end bracket 14.

[0042] Please see Figure 4 It can be seen that:

[0043] The active leveling assembly 15 includes a leveling beam 15-1, with a first base plate 15-2 and a second base plate 15-5 respectively installed below its two ends. A first bearing seat 15-3 is installed on the first base plate 15-2, and a second bearing seat 15-6 is installed on the second base plate 15-5. A leveling rotating shaft 15-7 is installed between the first bearing seat 15-3 and the second bearing seat 15-6. A leveling inner rotating cage 15-8 is installed on the leveling rotating shaft 15-7, and a leveling roller 15-9 is installed outside the leveling inner rotating cage 15-8. The drive assembly 16 drives the rake shaft 15-7 to rotate, and the rake shaft 15-7 drives the inner rake cage 15-8 and the rake roller 15-9 to rotate. The rake roller 15-9 continuously cuts the mud surface protrusions on the passage path. The cut mud surface lumps are pushed forward by the inner rake cage 15-8 and the rake roller 15-9 and fill the pits and depressions, achieving the effect of smoothing peaks and filling valleys.

[0044] Considering that the inner rake drum 15-8, rake roller 15-9, and rake shaft 15-7 will be subjected to significant pressure during the rakeing operation, and that the rake shaft 15-7 is prone to deformation, thus affecting the driving and transmission effects, in this embodiment, a central bearing 15-4 is installed below the middle of the rake beam 15-1. The middle part of the rake shaft 15-7 is located inside the central bearing 15-4. By setting the central bearing 15-4, the rake shaft 15-7 is reliably supported in the middle, improving the structural strength of the rake shaft 15-7 and effectively preventing its deformation. At this time, the inner rake drum 15-8 is installed between the first bearing 15-3 and the central bearing 15-4, and between the second bearing 145-6 and the central bearing 15-4, that is, a portion of the inner rake drum 15-8 is provided on both the left and right sides of the central bearing 15-4.

[0045] In this embodiment, the inner rake cage 15-8 is constructed from welded metal profiles, forming a cylindrical cage structure. A bushing is welded and installed at the center of the cage structure, and the rake shaft 15-7 is located inside the bushing and fixedly connected by bolts. The rake cutter 15-9 includes an annular cutter holder and annularly arranged cutter teeth located outside the cutter holder. The cutter holder is fitted onto the inner rake cage 15-8 and fixedly connected by bolts. This allows the rake cutter 15-9 to be replaced when it experiences excessive wear, and it can also be removed from the rake shaft 15-7 and replaced when the inner rake cage 15-8 undergoes excessive deformation due to impact or other factors.

[0046] The leveling roller 15-9 can be processed in the following way: a thick steel plate is cut into a ring shape, and multiple ear plates are integrally cut into the inner edge of the ring. The ear plates are bent at right angles toward the same side, and connecting holes are processed on each ear plate. Cutting teeth are formed on the outer edge of the ring. During installation, the leveling roller 15-9 is fitted onto the inner leveling drum 15-8 one by one, and the inner ear plates are fixedly connected to the profile of the inner leveling drum 15-8 with bolts.

[0047] In this embodiment, the active leveling component 15 mounted on the tail support 11 has its leveling crossbeam 15-1 directly mounted and fixed below the rear end of the tail support 11; the active leveling component 15 mounted on the middle support 12 has its leveling crossbeam 15-1 mounted in front of the middle support 12 using an adapter base; the active leveling component 15 mounted on the end support 14 has its leveling crossbeam 15-1 mounted behind the end support 14 using an adapter base. In this way, adjacent active leveling components 15 are staggered by a certain distance in the front-to-back direction to avoid adverse effects on each other (e.g., stones getting stuck between adjacent active leveling components 15).

[0048] In this embodiment, as Figure 4 As shown, the drive assembly 16 includes a hydraulic motor 16-1 fixed to the end of the leveling beam 15-1 of the active leveling assembly 15 and a transmission box 16-2. A bevel gear set is installed in the transmission box 16-2. The axle of one bevel gear in the bevel gear set serves as the input shaft and is connected to the output shaft of the hydraulic motor 16-1. The axle of the other bevel gear in the bevel gear set serves as the output shaft and is connected to the end of the leveling shaft 15-7.

[0049] In this embodiment, a support beam is also provided in the middle of the towing front support 2. The hydraulic pipeline 1, which is connected to the swing hydraulic cylinder 5, the roller support hydraulic cylinder 7, the stern support hydraulic cylinder 9, the tilting hydraulic cylinder 13, and the hydraulic motor 16-1, extends along the support beam to the front end of the towing front support 2, so as to facilitate connection with the hydraulic station facilities on the ship and establish a complete hydraulic control system.

[0050] The operating mode of this active underwater rake leveler:

[0051] When not in use, this leveling tool is suspended in a folded state at the rear or side of the vessel's facilities, or placed on the deck. During underwater leveling, a ship's crane lowers the leveling tool, folded, onto the muddy bottom surface. Then, the ship's hydraulic station drives two swing hydraulic cylinders 5 to extend their piston rods, causing the mid-section support 12 to gradually unfold rearward. Once fully unfolded, the hydraulic station drives two tilting hydraulic cylinders 13 to extend their piston rods, causing the rear support 14 to gradually tilt outward, ultimately achieving...Figure 2 or Figure 3 The fully deployed state shown in the image;

[0052] Afterwards, based on the information obtained about the bottom mud surface (the soil type, hardness, etc. of the bottom mud surface, which is obtained through the pre-construction survey procedure), the operator operates the hydraulic station to extend or retract the piston rod of the roller bracket hydraulic cylinder 7, which can adjust the distance between the bottom of each active rake leveling component 15 and the bottom mud surface. Then, by operating the hydraulic station to extend or retract the piston rod of the tail bracket hydraulic cylinder 9, the distance between the bottom of the active rake leveling component 15 on the tail bracket 11 and the bottom mud surface is adjusted.

[0053] After the adjustment and setting are completed, the vessel is started and sails along the set route. The vessel slowly tows the leveler on the seabed. At the same time, the hydraulic motors 16-1 of each drive component 16 are started through the hydraulic station to rotate. The drive components 16 drive the inner leveling cage 15-8 and the leveling roller 15-9 of each active leveling component 15 to rotate. On the towing path, when the active leveling component 15 comes into contact with the mud surface protrusions on the seabed, the rotating inner leveling cage 15-8 and the leveling roller 15-9 actively cut the mud surface protrusions. The mud fragments and mud slurry formed after the oblique cutting are squeezed and pushed forward by the inner leveling cage 15-8 and the leveling roller 15-9 as the leveler continues to be towed. When passing through the pits and depressions on the mud surface on the seabed, they fall into the pits and depressions, realizing the leveling effect of peak reduction and valley filling. The mud surface on the seabed after leveling is easy to carry out subsequent construction.

[0054] After the leveling operation is completed, the ship stops moving. The hydraulic station controls the tilting hydraulic cylinder 13 to tilt and fold the end support 14. Then, the swing hydraulic cylinder 5 is controlled to fold the middle support 12 forward. The ship's crane is then used to lift the underwater leveler to the water surface. A high-pressure spray gun is used to thoroughly wash and clean it to remove the adhering mud. The underwater leveler is then suspended at the stern or side of the ship, or lifted to the deck and left to stand, awaiting the next leveling operation.

Claims

1. An active bottom leveling device for dredging projects, characterized in that: The system includes a front towing bracket (2), a main frame (6) mounted at the rear of the front towing bracket (2), middle brackets (12) mounted on the left and right sides of the main frame (6), a tail bracket (11) mounted above the rear of the main frame (6), a roller bracket (8) mounted below the rear, and end brackets (14) mounted at the outer ends of the two middle brackets (12); two support rollers (10) are mounted on the roller brackets (8); an active leveling assembly (15) and a drive assembly (16) are mounted on the tail bracket (11), the two middle brackets (12), and the two end brackets (14); the active leveling assembly (15) includes... The system includes a leveling beam (15-1), with a first base plate (15-2) and a second base plate (15-5) installed below its two ends respectively. A first bearing seat (15-3) is installed on the first base plate (15-2), and a second bearing seat (15-6) is installed on the second base plate (15-5). A leveling shaft (15-7) is installed between the first bearing seat (15-3) and the second bearing seat (15-6). A leveling inner rotating cage (15-8) is installed on the leveling shaft (15-7), and a leveling roller (15-9) is installed outside the leveling inner rotating cage (15-8). A drive assembly (16) drives the leveling shaft (15-7) to rotate. A central bearing seat (15-4) is installed below the middle of the leveling crossbeam (15-1), and the middle of the leveling shaft (15-7) is located inside the central bearing seat (15-4); the inner rotating cage (15-8) of the leveling shaft is installed between the first bearing seat (15-2) and the central bearing seat (15-4), and between the second bearing seat (15-6) and the central bearing seat (15-4). The front part of the tail support (11) is hinged to the main frame (6), and a tail support hydraulic cylinder (9) is installed between the main frame (6) and the tail support (11); the inner end of the middle support (12) is hinged to the main frame (6), and a swing hydraulic cylinder (5) is installed between the main frame (6) and the middle support (12); the end support (14) and the middle support (12) are hinged together by a linkage mechanism (17), and a tilting hydraulic cylinder (13) is installed between the middle support (12) and the end support (14). The active leveling component (15) installed on the tail support (11) has its leveling crossbeam (15-1) directly installed and fixed below the rear end of the tail support (11); the active leveling component (15) installed on the middle support (12) has its leveling crossbeam (15-1) installed in front of the middle support (12) using an adapter base; The active leveling component (15) installed on the end support (14) has its leveling crossbeam (15-1) installed behind the end support (14) using a transfer base.

2. The active bottom leveling device for dredging projects as described in claim 1, characterized in that: The inner rake cage (15-8) is made of metal profiles and is a cylindrical cage structure. A bushing is welded and installed at the center of the cage structure. The rake shaft (15-7) is located inside the bushing and is fixedly connected by bolts. The rake cutter (15-9) includes an annular cutter holder and cutter teeth arranged in annularly outside the cutter holder. The cutter holder is sleeved on the inner rake cage (15-8) and fixedly connected by bolts.

3. The active bottom leveling device for dredging projects as described in claim 2, characterized in that: The front part of the roller bracket (8) is hinged to the main frame (6), and a roller bracket hydraulic cylinder (7) is installed between the main frame (6) and the roller bracket (8).

4. The active bottom leveling device for dredging projects as described in claim 3, characterized in that: The linkage mechanism (17) includes a first support (17-1) welded to the outer end of the middle support (12) and a second support (17-4) welded to the inner end of the end support (14). A first connecting rod (17-2) is hinged on the first support (17-1) and a second connecting rod (17-3) is hinged on the second support (17-4). The first connecting rod (17-2) and the second connecting rod (17-3) are hinged together. A sleeve is installed at the piston rod end of the tilting hydraulic cylinder (13), and the hinge axis of the first connecting rod (17-2) and the second connecting rod (17-3) passes through the sleeve.

5. The active bottom leveling device for dredging projects as described in claim 4, characterized in that: in Limiting chains (4) are installed between the middle sides of the front drag bracket (2) and the middle of the two middle brackets (12). A bracket connecting plate (3) is installed in the middle of the front drag bracket (2). The front end of the limiting chain (4) is connected to the connecting seat on the bracket connecting plate (3) by a shackle, and the rear end of the limiting chain (4) is connected to the connecting seat on the middle bracket (12) by a shackle.

6. The active bottom leveling device for dredging projects as described in claim 5, characterized in that: The drive assembly (16) includes a hydraulic motor (16-1) fixed to the end of the rake beam (15-1) of the active rake assembly (15) and a transmission box (16-2). A bevel gear set is installed in the transmission box (16-2). The axle of one bevel gear in the bevel gear set serves as the input shaft and is connected to the output shaft of the hydraulic motor (16-1). The axle of the other bevel gear in the bevel gear set serves as the output shaft and is connected to the end of the rake shaft (15-7).

7. The active bottom leveling device for dredging projects as described in claim 6, characterized in that: in The middle part of the towing front bracket (2) is also provided with a support beam, and the hydraulic lines (1) connected to the swing hydraulic cylinder (5), roller bracket hydraulic cylinder (7), tail bracket hydraulic cylinder (9), tilting hydraulic cylinder (13) and hydraulic motor (16-1) extend along the support beam to the front end of the towing front bracket (2).

Images