Research Trends of Cutter Suction Dredger Reamer Technology

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Cutter suction dredgers are mainly used for dredging, dredging, channel excavation, land reclamation and other purposes. They are widely used in projects such as port construction, channel widening, land expansion and land reclamation. Dredging dredging tools. It uses positioning piles for positioning, places the reamer on the bridge frame at a certain required depth, and uses the front end of the suction pipe to install a rotating reamer device around the suction pipe to cut and stir the river bottom sediment, and then through the suction pipe The hoisted silt material is transported to the silt material accumulation field with the help of powerful pump force, so as to achieve the purpose of dredging. One of its core components is a reamer for excavating underwater soil. The performance of the reamer has a decisive impact on the performance of the ship. Many people at home and abroad have carried out research on the performance of reamers. For example, Pan Yingjie from Shanghai Jiaotong University et al. Based on the three-dimensional cutting theory, according to different soil characteristics and different geometric shapes and working conditions of the reamer, the load on the reamer head is analyzed and studied. Foreign countries have carried out in-depth research on cutter suction dredgers for environmental protection, and designed several new types of environmental protection reamers, such as the disc-type environmental protection reamer specially designed for environmental protection dredging by the Dutch Boskalis company, and the Belgian international dredging company. Spade Suction Reamer. At present, most of domestic reamer designs are in the stage of empirical design and imitation, the product adaptability is poor, and there is still a relatively large gap with foreign countries. Therefore, the development of high-performance reamer and reamer slewing mechanism plays a very important role in improving the working efficiency of dredgers. The following is a detailed introduction to the relevant technologies of the cutter system of cutter suction dredgers in recent years, for the reference of enterprises, research institutions and related personnel.

Plan 1

[Technical purpose]: To provide an adjustable cutter dredging device for a cutter suction dredger.

[Technical solution]: This technology provides an adjustable cutter dredging device for a cutter suction dredger, which is composed of a cutter leveling device, a protective cover opening and closing device, a mud cutting and feeding device, and a hydraulic drive device. The reamer leveling device is composed of a bracket assembly, a hydraulic cylinder, a knife rest assembly, and a shaft pin. The bracket assembly and the knife rest assembly are connected through a pivot pin and a hydraulic oil cylinder to form a lever mechanism. Under the action of the hydraulic oil cylinder, the tool holder assembly can rotate around the shaft pin, so that the reamer can effectively excavate mud at different depths and slopes. The opening and closing device of the protective cover is composed of a reamer assembly, a suction pipe and a protective cover assembly. The reamer assembly includes a knife arm, a screw mud feeding mechanism, a shaft hub and a knife ring. The knife arm is a spatial spiral structure, and the two ends are respectively fixed on the shaft hub and the knife ring, and the cutting edges of the knife arm are all distributed on the same conical surface. The screw mud conveying mechanism is installed in the cavity of the reamer, and is fixedly connected with the knife arm and the shaft hub. The loosened soil is rotated by the reamer, conveyed to the mouth of the suction pipe by the screw mud conveying mechanism, and sucked away by the suction pipe. The hydraulic driving device is composed of a hydraulic motor, a reamer shaft, a rolling bearing, and an underwater sealing assembly. Under the action of hydraulic energy, the hydraulic motor rotates to drive the reamer shaft to rotate.

[Technical effect]: This dredging device can not only meet the requirements of environmental protection dredging, but also has less clogging faults of the reamer, is easy to remove, and has high dredging quality. The device adopts a modular structure design, the structure is simple and compact, and can be used interchangeably with the standard cutter head of the dredger, and the operation is flexible, convenient, and safe##. A protective cover assembly is set above the reamer assembly, which can effectively prevent the sludge in the reamer cavity from diffusing to the water body outside the cover and prevent secondary pollution; at the same time, in the process of suction and discharge of mud, the water body outside the cover is prevented from replenishing into the cover, improving the The concentration of suction and discharge sludge is high, and the working efficiency is high. The device adopts a better reamer assembly structure, which has the characteristics of smooth excavation bottom mud, strong adaptability to soil quality, high production efficiency, and prevention of secondary pollution. (CN03156473.9)

Plan 2

[Technical purpose]: To provide a compact, dual-motor driven reamer transmission system that is suitable for large cutter suction dredgers, can transmit high power and high torque.

[Technical solution]: The dual-motor drive reamer transmission system provided by this technology, the structural diagram is shown in the figure below.

The dual-motor driven reamer transmission system includes a variable frequency motor 1, a highly elastic friction clutch 2, a gearbox 3, an intermediate transmission shaft 4, an intermediate support device 5, a reamer shaft 6, a reamer support bearing 7 and a reamer 8. Two variable-frequency motors 1, two high-elastic friction clutches 2, and two gear boxes 3 are divided into two groups, all of which are supported by bridges; each group includes a variable-frequency motor 1, a high-elastic friction clutch 2 and a gear box 3; The high elastic friction clutch connects the variable frequency motor 1 and the gearbox 3 , and the variable frequency motor 1 transmits power and speed to the gearbox 3 through the high elastic friction clutch 2 . The highly elastic friction clutch 2 acts as a flexible connection. And adjust the system stiffness through the rubber parts inside the clutch, the system has good torsional vibration performance. The two gearboxes 3 form a double-machine parallel structure to jointly drive the intermediate transmission shaft 4 . The gearbox 3 has bearings that can withstand two-way thrust. The axial thrust generated by the reamer is transmitted to the bearing of the gear box 3 through the intermediate transmission shaft 4, and the heald is transmitted to the bridge frame 9 through the anchor bolts of the gear box. . When the two variable frequency motors 1 work at the same time, the two variable frequency motors 1 can be controlled at the same time, so that the even load of the two variable frequency motors 1 can be satisfied. The gearbox 3 is coupled with the intermediate transmission shaft 4 . The intermediate drive shaft 4 is coupled with the reamer shaft 6 . Each intermediate transmission shaft 4 is supported by an intermediate support device 5 . The intermediate supporting device 5 includes a polymer composite material bearing, and the intermediate transmission shaft 4 rotatably passes through the polymer composite material bearing. The polymer composite bearing is lubricated and cooled by sea water, and has the characteristics of good elasticity and good wear resistance. The intermediate supporting device 5 is fastened on the bridge frame 9 through anchor bolts, which can effectively support the weight of the intermediate transmission shaft 4 itself and the radial force generated by the operation. The reamer supporting bearing 7 is a polymer composite material bearing, which has a good shock-absorbing and shock-absorbing effect on the vibration of the bridge frame 9, and has a good displacement compensation capability for the irregular deformation of the bridge frame 9.

[Technical effect]: The dual-motor driven reamer transmission system is suitable for large cutter suction dredgers, has a compact structure, can transmit high power and high torque, and can withstand bidirectional axial thrust, so that it can withstand large axial thrust. The system layout is reasonable: the intermediate transmission shaft is supported by polymer composite bearings, which have good elastic support performance, good shock absorption, good shock absorption for bridge vibration, and good displacement compensation for bridge irregular deformation Ability, makes the smooth use of the bridge possible. The system is lubricated and cooled by clean sea water, which will not cause environmental pollution, long working life, low noise, corrosion resistance, and easy maintenance. (CN200810200670.2)

Plan 3

[Technical purpose]: To provide a cutter head that is rotatably installed around the center of the cutter head relative to the suction device in a cutter suction dredger.

[Technical Solution]: This technology provides a cutter head (3) for a cutter suction dredger (1), which is used to be rotatable around the central axis of the cutter head relative to the suction device (4) installed, the suction device sucks the loose material cut from the bottom of the water body (6) by the cutter head, the cutter head includes a base ring (7), a protrusion positioned at a certain distance from the base ring in the direction of the central axis (8), and a plurality of arms (9) extending from the base ring to the protrusion and distributed at equidistant intervals in the circumferential direction, each having a radially outer portion (11) of the arm positioned relative to a series of teeth (12) pointing outwards at an angle in circumferential direction, the direction of rotation of the cutter head is set in such a way that the teeth perform a cutting movement, while non-return means (13-15) extend between at least two adjacent arms, whereby Prevents the cut material from moving from the central axis to the outside. (CN200780010435.2)

[Technical effect]: The cutter head of the cutter suction dredger can be made not only by assembling the non-return device during the manufacturing process of the cutter head, but also by assembling the non-return device afterwards, which can easily improve the existing head of the knife. And the technology solves the problem of leakage in cutter suction dredgers.

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