How does a dredger ship work?
The cutter suction dredger is a dredger ship that excavates sand underwater with the help of a cutter and dredigng pump. The reamer is one of the key equipment for the dredging of the cutter suction dredger. In the dredging operation, the reamer cuts and breaks the underwater soil layer, so that the mud pump can suck up the peeled and loose soil, and then pass the water and land. The sludge discharge pipeline transports the mud to the designated area to complete the construction process of dredging or dredging.
The main system of dredger ship
In the construction process, the dredge pump is the main component of the cutter suction dredger. It is driven by the diesel engine to suck and discharge the mud. However, in order to achieve the expected specified depth, width, and length, except for the dredger pump , Must also be equipped with other types of working machinery.
Cutter suction dredger is mainly composed of three parts: hydraulic system, dredging pump suction and discharge system and cutter system.
1. Hydraulic system
The hydraulic system completes the drive of some mechanical devices such as the reamer, the traverse, the reamer, the positioning pile, the anchor, etc.; the advantage of the hydraulic drive is that its structure is compact (for example, the reamer can be driven without a reduction gear box), easy to arrange, The initial investment is small.
2. Dredging pump suction and discharge system
Dredging pump suction and discharge system is composed of power system, transmission system, centrifugal mud pump, hull, mud conveying system (including water buoy mud pipe, submerged pipe and land mud pipe).
3. Cutter system
The Cutter system realizes the function of moving the soil away from its original location and mixing with nearby water to form a slurry. The reamer is driven by a hydraulic motor. The drive power and structure of the reamer system have a significant impact on the working capacity and efficiency of the dredger.
About how does a dredger ship work?
After the dredger ship bridge enters the water, start the dredging pump and cutter. Then continue to lower the bridge to the bottom or reach its maximum depth. The dredger moves around the steel piles by retracting the anchor cables on the starboard and the starboard.
These anchor cables pass through pulleys arranged near the reamer and are connected with winches arranged on the deck. The traverse winch ensures that the two anchor cables have the correct tension, which is especially important when digging hard rocks.
At the same time, the results are different when the rotation direction of the cutter is the same or opposite to the swing direction of the dredger.
- In the same direction, the reaction force of the reamer on the soil will drive the dredger, so the traction force of the traverse winch is smaller than that of the reverse rotation.
- When the direction of rotation of the reamer is not the same as that of the dredger, the correct pretension of the rope must be ensured. If the force of the reamer drives the moving speed of the reamer to exceed the traction speed of the traverse winch, it will be very dangerous.
Because the rope of the traverse winch will be picked up and cut by the reamer. At the same time, the position of the traverse anchor has a great influence on the force required to swing the dredger. The closer the reamer’s trajectory is to the direction of traversing the anchor cable, the smaller the force required.
The thickness of the soil layer (cutting thickness) that can be removed by one swing depends on both the diameter of the winch and the type of soil.
When the required digging depth is not reached at the end of a swing, continue to lower the bridge and make the dredger swing in the opposite direction. The dredger swings around a fixed point, which is a fan swing around the main steel pile at the stern.
The steel pile trolley is driven by a hydraulic oil cylinder. Because the steel piles stand on the bottom of the water, pushing the trolley toward the stern direction can make the cutter suction dredger move forward. After each forward movement, at the end of the swing, the dredger ship bridge can be lowered to a cutting thickness to dig out one or more layers of substrate on the working surface.
When the hydraulic cylinder stroke is completed, lower the auxiliary steel pile to the bottom of the water, lift the main steel pile and move the trolley forward. After completing the above work, lower the main steel pile and lift the auxiliary steel pile. Then continue to work.