The quality of the rubber fenders affects the scheduling of consumer vessels, restricts the use of consumer berths, and endangers the safety of docks and ships. The cause of damage to the rubber fender is not an occasional accident and operation management problem, and there are deeper theoretical reasons. To deal with it, we should first analyze the discussed countermeasures in the design and selection of rubber fenders and material manufacturing.
With the different types of dock construction, the choice of rubber fender construction depends on the type of ship, the construction of the wharf, and the tide, wind and wave conditions. Rubber fenders have the advantages of high energy absorption, low reaction force, wear resistance, insect resistance, simple installation, convenient maintenance, etc. Most of the domestic and foreign rubber fenders have been rubberized and exchanged. The total investment of China's ports each year can reach 40 million. The fenders were purchased by the rubber fender consumer plant around Yuan Yuan.
When a ship leaves the dock, it produces a destructive impact force. In order to reduce the damage to the ship and the dock caused by direct collision between the docks, the front of the dock needs to be equipped with anti-shock equipment. Most ports in China started to adopt rubber fenders around 1970 + the rubber fenders currently used in various countries in the world can be divided into five types: compact, inflatable, shear, rotary and hydraulic. The first two types are used very common. Most of the rubber fenders used in ports in China today are domestic compact rubber fenders, including cylindrical, D, V, DA, GD, drum, floating and foam rubber fenders.
The distance and aspect ratio of the rubber fenders are very critical. Fender consumer manufacturers must ensure that the ship cannot immediately touch the port wall under the bad berthing perspective allowed by the code. To ensure that ships can dock safely at different tide levels and deep drafts, and have a strong ability to adapt to ships with different cargo volumes. The stability conditions for the safe operation of different types of T-ships must be met, which in practice reflects the terminal's request for wave protection. The rubber fender is a ship's mooring energy absorption device. The magnitude of the reaction force determines the three-dimensional space movement of the ship. Due to the effects of wind, waves, and current, and the azimuth difference of the pier, the harbor pool is affected by the wavelet high and long periodic waves. Both can generate a large ship collision energy by the pier, which requires the new rubber fenders to have good energy absorption characteristics. The allowable cumulative frequency of wave height in front of the terminal is usually 4%. 3% of the effective wave height is used abroad.
Because the factors that affect the allowable wave height in front of the wharf are relatively complicated, the impact energy of the waves, cross waves, and oblique waves on the ship at the wharf and the motion parameters of the ship must be calculated. The impact force of the hull on the wharf is passed through the rubber fender. Maintenance of dock structure and hull safety. Calculated according to the rolling period of different tonnage ships, the possibility of ships hitting the dock and resonance of waves should be prevented, and the allowable wave height should be taken to a low value.
The deformation of the rubber fender and its corresponding reaction force absorption. It reflects the wave height, wind and water flow conditions in front of the terminal. The size of the flow pressure angle between the flow pressure experienced by the ship is related to the direction of the sea current and the port. At this time, the backflow hazard is small and the recoil of the rubber fender rim of the dock is also small. However, the wave pattern has a negative impact on the ship's work. Still existing, the bad pressure specifications of the rubber fender piers of the wharf are composed under the conditions of transverse waves, high water marks, and the bilge of the ship. Dock rubber fender consumer manufacturers are discussed in accordance with the following procedures: the representative ship type and its final speed are determined; the calculation of the effective shore energy of the representative ship type; the calculation of the anti-shock equipment type to determine the type, layout and subordinate equipment of the anti-shock equipment .
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