The 6S50MC-C model adopts a lot of modern material science and technology and scientific assembly technology. Compared with the MC model, there are mainly improvements in the following forms:
(1) The single side butt welding of the frame and the frame is cancelled, and the hidden welding is cancelled. The welding place is easy to check, and the automatic welding rate is improved, and the overall length is shortened.
(2) The through-bolt is changed from the original single bolt form to the double bolt form, so that the bolt length is 30% shorter than the original, and the diameter is 30% thinner. The double bolt connection is adopted to increase the natural frequency of the whole frame and frame and reduce the vibration.
(3) cylinder block cylinder block cancelled the cooling water chamber, cooling water pipe to take the form of non-casting, making casting easier,S50MC-C more bold cylinder block and CAM box cast into one.
(4) cylinder block cylinder block and cylinder head connection surface position is reduced, the cooling water jacket is more simple, only in the cylinder liner on the 1/3 of the cooling water jacket, cancel the lower half of the cooling water jacket, combined with ultra-long stroke characteristics, the use of slender structure.
(5) Combustion chamber structure “Topland”
It is higher than MC machine, that is, the distance between the top of the piston and the end face of the cylinder liner becomes larger at TDC, and the connection surface between the cylinder liner and the cylinder head decreases.
The thermal load of the first piston ring is reduced, and the cooling effect of the whole piston ring (a total of 4) is increased.
(6) As the piston head “Topland” (as described above) increases, the first piston ring becomes a controlled pressure relief type, the second, third and fourth piston rings have inclined ladders, and the first and second rings are increased in height on the basis of practice. All piston rings are made of a new material :RVK-C.
(7) the cross head oil pull pipe is connected to the widened crosshead pin, and it is not necessary to remove the oil pull pipe when repairing the piston.
(8) The main bearing, crank pin bearing and cross bearing adopt thin bearing ternary alloy: SN40-Al, which increases the fatigue strength of the bearing at high temperature.
(9) The fuel valve adopts semi-sliding fuel valve to reduce the possibility of carbon deposition.
(10) Camshaft layout Camshaft bearings are arranged between the guide sleeves of the roller, the CAM is installed on the camshaft by “hot sleeve”, and the exhaust valve is driven by hydraulic pressure.
(11) The exhaust valve is driven by hydraulic pressure. The stem material is nickel-chromium titanium alloy. There is an impeller in the middle of the stem, and it is closed with oil pad damping.
(12) The chain drive adopts compact short chain drive, which is conducive to the installation of secondary torque compensator.
(13) the use of new top pull support
(14) The crankshaft axial distance is shortened and the weight is reduced
(15) In the lubrication system, the independent camshaft lubrication system is cancelled.
(16) On 6S50MC-C machine, VIT timing injection mechanism (VariableInjectionTiming) is installed. Its main function is to automatically adjust the starting point of fuel injection. When the machine load drops from 100% to a certain predetermined partial load (such as 85%), it is called the turning point and the Pmax burst pressure at MCR Keep it constant.
(17)6S50MC-C machine is also installed with a slow rotation device, whose purpose is to slow the main engine in the stop state for a long time and need to restart, before starting 1 ~ 2 rotation (in the bridge control), or according to the operator’s will only slow rotation (in the central control room control), slow rotation speed is set at ~ 12r/min, through slow rotation, the combustion chamber and the top of the piston head can be changed Remove dirt and steam.
(18) Because of the compact structure of MC-C machine, the amplitude of axial vibration is increased, so it is very necessary to install the Axialvibrationdamper. The Axialvibrationdamper is installed at the front end of the crankshaft, including a small piston and a partial cylindrical structure, which is installed at the front end of the first main bearing. The cylindrical structure is fixed on the main bearing seat On. In order to check the function of axial vibration absorber,MC-C machine has added Axialvibrationmonitor. Through the displacement sensor, the amplitude can be read directly from the axial vibration meter. If the amplitude exceeds a certain set value, it can be directly transferred to the remote control system of the main engine to slow down the main engine.
TYPE ：6S50MC-C
1 SPINDLE GUIDE Part No. “90910-0145-077
DRW 90910-0145-077”
2 NOZZLE Part No. “90910-0145-065
DRW 90910-0145-065”
3 SPRING Part No. “90910-0145-220
DRW 90910-0145-220”
4 NON-RETURN VALVE Part No. “90910-0145-197
DRW 90910-0145-197”
5 O-RING Part No. “90910-0145-089
DRW 90910-0145-089”
6 O-RING Part No. “90910-0145-124
DRW 90901-0145-124”
7 O-RING Part No. “90910-0145-148
DRW 90901-0145-148”
TYPE：6S50MC-C
1 Piston ring.Reg.No343A-44
2 O-ring.Reg.No343A-A15
3 O-ring.Reg.No343A-59
4 Gasket. Reg. No.343A-61
5 Spring.Reg.No343A-60
6 Spring.Reg.No343A-H2
7 Seal ring. Reg. No.343A-34
8 Guide ring.Reg.No343A-35
9 Piece.Reg.No343A-97
10 Gasket.Reg.No343A-80
11 Gasket. Reg. No.343A-27-1
12 O-ring.Reg.No343A-27-2
13 O- ring. Reg. No.343A-27-3
14 Spindle guide compl.Reg.No344A-A
15 O- ring. Reg. No.344A-13
16 O- ring. Reg. No.344A-9
17 O-ring.Reg.No344A-8
18 Spring.Reg.No344A-C4
TYPE:MAN B&W 6S50MC-C LKM-(Y)JU/YN
1 GASKET FOR CHANNEL COVER Part No. 8
2 GASKET FOR REVERSING COVER Part No. 9
3 GASKET FOR CASING Part No. 10
4 PACKING RING FOR FRAME Part No. 11
5 PROTECTING ANODE Part No. 20
6 GASKET FOR PROTECTING COVER Part No. 17