In recent years, my country’s economic development has made great progress, and the importance of dredging projects has gradually been paid attention to, making dredging ships gradually develop in a large and intensive direction. Among them, the production capacity of cutter suction dredgers has increased from 800m3 in the past. /h is rapidly increased to 4000m3/h, but it is still unable to catch up with the steps of developed countries. For example, the large cutter suction dredger of 6500m3/h was born in Europe a few years ago. Improving the production efficiency of cutter suction dredgers will inevitably place great demands on parts, and will also wear parts. This paper analyzes and discusses how to improve the production efficiency of cutter suction dredgers based on our company’s years of on-site construction experience.
The cutter head of dredger, as the core excavation component of the cutter suction vessel, is installed at the entrance of the suction pipe at the end of the bridge to play the role of cutting soil. For the cutting system of the cutter suction vessel, the operation efficiency of the cutter will directly affect the operation effect of the system. In terms of structural composition, the reamer head is composed of a hub, a reamer seat and a knife arm, as shown in Figure 1, and the toothed reamer head has detachable teeth. Among them, the transmission function of the hub can be connected with the transmission shaft by means of keyways and threads. The cutter seat is used to fix the cutter arm and the cutter head. The cutter arm is distributed on the periphery of the cutter head, which can directly cut the soil and is usually composed of 5-6 cutter teeth. The number of cutter arms will affect the cutting force of the cutter head of dredger. If there are more arms, the opening width of the cutter head will be smaller, and the maximum cutting thickness that can be achieved during construction will be smaller.
Using the new gradient remanufacturing process can better solve the contradiction between the wear resistance and the fracture resistance of the dredger teeth. The process can reduce the weight of the reamer blade, prolong its life, improve the dredging efficiency and make the reamer blade have good remanufacturing performance.
my country has a large number of rivers, lakes and seas, a wide range of river basins, and many river basins have high sediment content, resulting in serious siltation in the estuaries of rivers and serious damage to the ecological environment. And it will also seriously hinder the sediment discharge and flood discharge of the river. Therefore, it is necessary to take corresponding measures to deal with the deposition of river sediment. Dredgers are used in dredging works. The type of dredger should be selected according to the meteorological, hydrological and geographical environment characteristics of the dredging project. The main parts of the dredger will be impacted and rubbed by hard substances such as sand and gravel in the water during operation, so the materials of the parts need to have high wear resistance. Special attention should be paid to wear testing of cutter head of dredger.
One of the important equipment of the trailing suction dredger, the quality of the suction capacity of the drag head will have a significant impact on the dredging efficiency of the entire trailing suction dredger. When the dredger performs the “ditch” elimination operation, there are often some scattered shallow spots that are difficult to remove and sharp and hard trenches that are particularly difficult to eliminate, which are affected by the surrounding environment (wind current) and the design of the rake head itself. The more sharp and hard furrows will slide down, false sweeping will occur, and the furrows cannot be eliminated, resulting in a decrease in ship output, a reduction in construction efficiency, an increase in daily fuel consumption, and an increase in the cost of the ship.
The internal flow channel of the drag head is an important area for mud mixing and transportation. The vortex distribution in the flow channel of the drag head should be minimized as much as possible to avoid sediment deposition inside the drag head and reduce the internal flow resistance, so as to improve the system efficiency and reduce the system performance. energy consumption. Our company can provide thermal spray technology to solve such problems. Thermal spraying is to use a certain heat source (such as electric arc, plasma spraying or combustion flame, etc.) to heat and melt the coating material (powder or filamentary metal or non-metallic material), and atomize it into extremely fine particles with high-speed airflow. And it is sprayed to the surface of the workpiece at a high speed to form a coating. It has one or more properties of wear resistance, corrosion resistance, oxidation resistance, heat resistance, etc.
Suction dredgers are widely used and can operate in rivers, lakes and seas for dredging, channel excavation, and land reclamation. Under special circumstances, high-power reamer equipment is installed on the cutter suction dredger, and rock formations such as basalt and limestone can be excavated without blasting. The cutter suction dredger has high working efficiency, large output and long pump distance. The output of large cutter suction dredgers can reach several thousand cubic meters per hour; the sediment or crushed rock materials can be sent out several kilometers away by means of powerful power through the mud pump and the mud discharge pipeline. Cutter suction dredgers are simple to operate and easy to control. The dredger relies on the trolley of the boat to position and step the steel piles, uses the steel cables on both sides of the reamer boom and the anchors fixed on both sides of the dredging groove, and is pulled by the winch, and the hatchback swings to cut the sediment material. It works under the controlled swing angle, and pumps the twisted material to the accumulation yard through the mud pipe. However, when the existing cutter suction dredger is working, since the reamer cannot fully and completely crush the sediment, some large mud blocks are always sucked into the mud pipe, causing the mud pump to work. The abnormal conditions made it difficult for the dredger to continue working for a long time.
In order to solve the contradiction between the wear resistance and weldability of the cutter head of dredger and improve the life of the reamer blade, starting from the basic principle of remanufacturing wearing parts, according to the dredging operation conditions of the dredger blade, the wear resistance and working reliability of the blade teeth are The requirements of the cutter suction dredger can be remanufactured. Using the new gradient remanufacturing process can better solve the contradiction between the wear resistance and the fracture resistance of the dredger teeth. The process can reduce the weight of the reamer blade, prolong its life, improve the dredging efficiency and make the cutter head of dredger have good remanufacturing performance.
Tai’an OCEAN Pump Co. Ltd. (referred to as OCEAN Pump)specializes in the development, production and sales of sand pump machine, sand dredging machine, submersible dredger, small sand pump dredger, portable dredger, sand pump, submersible slurry pump, heavy duty sand pump, etc. As the leading sand dredging equipment designer, manufacturer and exporter, OCEAN Pump has been dedicated in supplying sand dredging machines to worldwide customers for over 20 years. OCEAN Pump has won the praise and trust of customers with rich industry experience, professional technology and excellent service.
