2、开始准备工作，操作人员先打开挖沙船操作柜上的24v电源总开关。然后通过挖沙船桥架绞车下降桥架和吸沙管、使绞刀沉入水中，再启动冲水泵冲水。然后齿轮箱与砂泵再通过操作台上的合排开关合排使发动机带动齿轮箱驱动砂泵工作。慢慢提高发动机到规定转速。但齿轮箱合排的转速是发动机最低转速绝对不允许发动机在高速情况下合排。在砂泵吸到水，排管管道出口，正常出水后，就可以启动绞刀使用左右横移开始生产工。特别注意：挖沙船在施工生产中做扇形运动时定位桩切不可同时插入泥沙中。操作中绝对不允许。挖沙船在施工中如需砂泵暂停运转就需要脱排，齿轮箱脱开砂泵运转。挖沙船发动机转速必须降到最低转速才可以脱排。

 4、工作结束，要停止发动机时通过桥架绞车提升使桥架绞刀离开沙土层，停在水里一段时间继续抽水。使挖沙船整个排泥沙管道无泥沙，然后降低发动机的转速脱排使砂泵停止工作，再通过挖沙船桥架绞车，提升桥架离开水面，加上保险。可以停止发动机，关闭海底阀，还有其它阀门，切断电源，关闭窗门。

 The matters needing attention from starting to end the whole process of dredging
Dredging sand is the construction machinery of underwater earthwork, it is mainly used to dig deeper, widen and clean up existing waterways and ports; the excavation of new waterway, port and canal; dredging dock, dock, shiplock and other hydraulic structures, and the sediment dug into the deep sea or blown into the land-based depressions make. It is an important machine, the cost is also expensive, so when using dredging sand, from start-up to end of work must pay close attention to dig sand
Work trends, pay special attention to the following matters:
 1, start digging sand engine idle running after 10 minutes or so, water temperature, oil temperature, oil pressure to meet the requirements of the situation can start production. In particular, the cold winter should pay attention to preheating.
 2, start preparation work, the operator first open the dredging vessel operation Cabinet of 24v power total switch. Then through the Dredging boat bridge winch down the bridge and suction sand tube, so that the cutter sink into the water, then start flushing water pump. Then the gear box and the sand pump and then through the operation stage of the combined line switch to make the engine drive the gear box driving sand pump work. Slowly improve the engine to the prescribed speed. However, the speed of the gear box is the lowest engine speed absolutely not allow the engine in high speed situation in the row. In the sand pump suction to the water, pipe outlet, normal water, you can start the cutter use of the left and right transverse move to start production construction. Special attention: Dredging sand in construction production to do a fan movement when positioning piles must not simultaneously inserted into the sediment. The operation is absolutely not permitted. Dredging vessels in the construction of the need for sand pump suspended operation, the gear box to remove the sand pump operation. The rotational speed of the dredge engine must be reduced to the lowest rotational speed before it can be discharged.
 3, in the work, dredging vessels operator indoor operators to pass, smell, listen, look, touch, observe the cabin situation. Smell whether there is abnormal sound, listen to see whether the engine monitoring meter is normal. The hydraulic system is leaking oil, the cooling system is leaking, the engine has three leaks. Leaking, leaking oil, leak. Touch the temperature of the motion parts of the magnitude of vibration sensation.
Deck operators also have to pass, smell, listen, look, and observe the deck above. Smell whether there is abnormal sound, listen to see whether the operation of dredging vessels operating room monitor meter is normal, past ship movements. On deck hydraulic system piping and underwater pipelines are leaking oil, etc.
 4, the end of the work, to stop the engine through the bridge winch hoist to make the bridge Reamer left the sandy layer, stopping in the water for a period of time to continue pumping. So that the whole sediment pipeline of dredging vessels without sediment, and then reduce the engine rotational speed to remove the sand pump to stop working, and then through the dredging boat bridge winch, lifting the bridge to leave the water, plus insurance. Can stop the engine, shut down the bottom valve, and other valves, cut off the power supply, shut down the windows.