4. Unloading the sand by bottom open unloading dredge pump or pulley belt dredge pump
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Both open-bottom ships and belt ships usually have a self-unloading function, so you don&#;t have to worry about the size of the ship, just choose different construction schemes according to the output.
The open-bottom ship is to pull up the bottom of the ship through iron chains. After transporting it to the river, loosen the hinges and open the bottom of the ship, so that the sand in the cabin leaks into the river, so that the ship can drive away. To load the sand, use a jet-type sand pump to absorb the sediment. The advantage of this operation method is that the unloading is not limited by time and does not require close cooperation. A jet-type sand pump can simultaneously extract multiple The silt of the bottom boat
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A user from Hepu, Guangxi province uses three open-bottom boats and two 10-inch jet boats for cyclic operation. The open-bottom boats are self-priming and self-unloading. The amount of sand pumped per hour is about 80 cubic meters. After being discharged to the bottom of the river, A 10-inch jet boat can extract 100 square meters of sand from the bottom of the water in about an hour. Compared with other methods, it is cheaper and more flexible.
The belt unloading sand ship is even simpler. The customer&#;s sand ship has a self-unloading function. If the sand on the belt ship needs to be transported over a long distance, it needs to use a funnel. The marine sand unloading pump is placed at the bottom of the funnel and is diluted and transported out with the help of a high-pressure water gun. If the belt ship can be docked, build a funnel at the dock, and then use the marine sand unloading pump to transport the sand in the same way.
The reclamation project of Hong Kong Kai Tak Airport uses a belt ship and a funnel. After the large belt ship docks, a hydraulic gate is added to the bottom of the funnel to control the amount of sand, and then the high-pressure water mixed with the sand enters the ZS350 large-scale sand unloading pump Among them, the ZS350 sand unloading pump is matched with a Weichai horsepower rpm diesel engine. The sand conveying distance is meters. The pipeline uses ultra-high molecular polyethylene pipes, and the sand unloading capacity is about 400 cubic meters per hour. The pipeline has an inner diameter of 350mm, the calculated pressure drop is 3.58 bar, and the flow rate is 4.03 m/s.
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