A common base for a marine propulsion unit and a method of installation

Abstract

The application relates to a common base of a ship main propelling device and a mounting method, a first platform has an upper panel and a lower panel, the upper panel is used for mounting a power output system of the ship main propelling device, and the lower panel is used for mounting a vibration isolator; a second platform has a panel used for mounting an intermediate support, and the panel is provided with adjusting pads for supporting the intermediate support; the flatness of the upper panel and the panel is not more than 0.02 mm, and the roughness is Ra3.2; the flatness of the lower panel is not more than 0.05 mm, and the roughness is Ra12.5; S1, the power output system is mounted on the upper panel of the first platform; during the mounting, the power output system, the intermediate support, the vibration isolator and an elastic coupling are sequentially mounted; a main propelling device base is welded on a ship body structure, and the common base of the ship main propelling device is mounted on the main propelling base. The common base of the ship main propelling device supports the intermediate support and the power output system at the same time, and the influence of ship body structure deformation on the centering of the main propelling device is reduced.

Description

Technical Field

[0001] This invention relates to the field of shipbuilding, specifically to a common base for a ship's main propulsion system and its installation method. Background Technology

[0002] The main propulsion system of a ship generally consists of a diesel engine, a flexible coupling, an intermediate support, and other accessories. The diesel engine is connected to the intermediate support through the flexible coupling, and then the intermediate support transmits the power to the ship's shafting equipment.

[0003] A ship's main propulsion system requires at least three hoisting operations during installation. After each hoisting, the diesel engine, flexible coupling, and intermediate support cannot be installed until the shafting and gearbox are in place. During this stage, the poor installation environment and limited space in the engine room make it difficult to measure and adjust the main engine, as well as install the intermediate support and flexible coupling.

[0004] Normally, the base of the diesel engine and the base of the intermediate support are independent of each other. Deformation of the hull structure will affect the alignment of the main engine. In addition, the intermediate support and the hull base are rigidly connected, which can easily transmit the vibration generated by the main propulsion device during operation to the hull. With the increase of operating time, it is easy to cause fatigue damage to the hull structure. Summary of the Invention

[0005] In order to shorten the installation and inspection time of various equipment of the main propulsion system of a ship, reduce the impact of the operation of the main propulsion system on the hull structure, and reduce the impact of hull structure deformation on the centering state of the main engine, the present invention provides a common base and installation method for the main propulsion system of a ship, wherein the intermediate support and the diesel engine share a set of bases for installation and support.

[0006] The technical objective of this invention is achieved through the following technical solution:

[0007] A common base for a ship's main propulsion system includes a first platform and a second platform, with the second platform located at one end closer to the first platform;

[0008] The first platform has an upper panel and a lower panel. The upper panel is used to install the power output system of the ship's main propulsion device, and the lower panel is used to install vibration isolators.

[0009] The second platform has a panel for mounting the intermediate support, and the panel is equipped with adjusting pads to support the intermediate support.

[0010] The flatness of the top panel and the bottom panel shall not exceed 0.02 mm, and the roughness shall be Ra3.2; the flatness of the bottom panel shall not exceed 0.05 mm, and the roughness shall be Ra12.5.

[0011] The height difference between the upper panel and the panel is equal to Hhd, where H is the height of the crankshaft center of the power output system from the mounting surface of the power output system on the upper panel; h is the height of the input flange center of the intermediate bracket from the mounting surface of the intermediate bracket on the panel; and d is the thickness of the adjusting shim.

[0012] Furthermore, the first platform includes a left platform and a right platform, which are symmetrically arranged about the crankshaft center of the power output system; the left platform and the right platform each have an upper panel and a lower panel; the second platform spans and is mounted on the upper panels of the left platform and the right platform and is located near the same end of the left platform and the right platform.

[0013] Furthermore, a first web is provided on the side of the left platform and the right platform that are close to each other. The first web is vertically arranged between the upper panel and the lower panel, and the first web, the upper panel and the lower panel have the same length.

[0014] Several first elbow plates are also provided between the upper panel and the lower panel, and the first elbow plates are set perpendicular to the first web plate, the upper panel and the lower panel.

[0015] Furthermore, threaded hole plates for mounting with lifting rings are provided at both ends of the upper and lower plates near the first platform.

[0016] Furthermore, at the end of the first platform away from where the second platform is located, between the left platform and the right platform, a first transverse connecting plate and a first longitudinal connecting plate are also provided. A first transverse connecting plate is provided near the upper panel and the lower panel respectively. The first transverse connecting plate near the upper panel is flush with the upper panel, and the first transverse connecting plate near the lower panel is flush with the lower panel. A first longitudinal connecting plate is vertically provided between the first transverse connecting plates near the upper panel and the lower panel. Two parallel first longitudinal connecting plates are provided on both sides of the width of the first transverse connecting plate, and the two ends of the length of the first longitudinal connecting plate are vertically connected to the first web plates of the left platform and the right platform respectively.

[0017] Furthermore, at one end of the first platform, a second platform is set, and a second transverse connecting plate and a second longitudinal connecting plate are set between the left platform and the right platform; the second transverse connecting plate is set close to the upper panel and is flush with the upper panel; the second longitudinal connecting plate is set vertically on the lower end face of the second transverse connecting plate and the two ends of the length of the second longitudinal connecting plate are respectively vertically connected to the first web of the left platform and the right platform.

[0018] Further, the second platform includes a panel, a second web plate, a second elbow plate, and a third elbow plate vertically disposed on the lower end face of the panel; the second web plate is disposed along the length direction of the second longitudinal connecting plate and corresponds vertically to the second longitudinal connecting plate; the two second web plates are disposed in parallel, and the two second longitudinal connecting plates are disposed in parallel; one end of the second web plate extends from the upper end face of the upper plate of the left platform to the upper end face of the upper panel of the right platform; the second elbow plate is vertically disposed on the lower end face of the panel and located outside the parallel second web plates; the third elbow plate is perpendicular to the lower end face of the panel and located between the parallel second web plates; the lower ends of the second elbow plate and the third elbow plate are vertically connected to the upper end face of the upper panel of the left platform and the right platform near the two ends of the second platform, and the lower ends of the second elbow plate and the third elbow plate are vertically connected to the upper end face of the second transverse connecting plate at other positions.

[0019] Furthermore, the two ends of the second web form inclined end faces on the upper plates of the left and right platforms, with the bottom of the inclined end faces extending to the outer edge of the upper plate.

[0020] The present invention also provides a method for installing a ship's main propulsion device, for mounting the ship's main propulsion device on the aforementioned common base for the ship's main propulsion device, the method comprising:

[0021] S1. Install the power take-off system on the top plate of the first platform;

[0022] The projection line of the output flange of the power output system is set on the top plate of the first platform. The mounting holes are opened on the top plate with the projection line of the output flange of the power output system as a reference. The power output system is installed on the top plate by inserting fastening bolts through the mounting holes.

[0023] S2. Install adjustment pads on the panel of the second platform and install the intermediate bracket on the adjustment pads;

[0024] After placing the intermediate bracket on the panel and adjusting its three-dimensional position, temporarily fix the three-dimensional position of the intermediate bracket. Measure the distance between the mounting surface of the intermediate bracket on the panel and the panel, and adjust the thickness of the shim by increasing the thickness by 0.5mm based on this distance. Install the adjusted shim on the panel and then install the intermediate bracket on the adjusted shim.

[0025] S3. Install vibration isolators on the bottom plate;

[0026] S4. Install a flexible coupling between the power output system and the intermediate support. The two ends of the flexible coupling are respectively connected to the output flange of the power output system and the input flange of the intermediate support.

[0027] After the flexible coupling is installed, the vibration isolator is preloaded. Once the compression of the vibration isolator is stable, the compression state of the vibration isolator is temporarily locked.

[0028] S5. Weld and install the main propulsion device base on the hull structure, and install welding pads on the main propulsion device base;

[0029] S6. The common base for the ship's main propulsion system is installed on the main propulsion base;

[0030] S61. After the water stress of the ship is released after it is launched and the ship's draft, heel, and trim are adjusted;

[0031] S62. Perform shaft support reaction force measurement and adjustment until the shaft force measurement meets the requirements;

[0032] S63. Install the gearbox and intermediate bearing. The intermediate bearing is installed outside the shaft system, and the output end of the gearbox is connected to the input end of the shaft system.

[0033] S64. Adjust the position of the common base of the ship's main propulsion system according to the position of the input end of the gearbox, so that the output flange of the intermediate support is aligned with the input end of the gearbox;

[0034] S65. Release the lock on the compression state of the vibration isolator, determine the position of the vibration isolator mounting hole on the welding shim according to the position of the vibration isolator, and after lifting the common base of the ship's main propulsion device, process the vibration isolator mounting hole on the welding shim.

[0035] S66. Adjust the position of the common base of the main propulsion system of the ship again according to the position of the input end of the gearbox, so that the output flange of the intermediate support is aligned with the input end of the gearbox, so that the weight of the common base of the main propulsion system of the ship isolator is completely placed on the vibration isolator, and fix the vibration isolator on the welding gasket with bolts.

[0036] S67. Install a universal coupling between the output flange of the intermediate support and the input end of the gearbox.

[0037] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0038] 1. The common base of the main propulsion device of the present invention supports the intermediate support and the power output system at the same time, reducing the impact of hull structural deformation on the centering of the main propulsion device.

[0039] 2. This invention reduces the excitation force generated by the vibration of the main propulsion device being transmitted to the hull structure through vibration isolators. Attached Figure Description

[0040] Figure 1 This is a top view schematic diagram of the common base of the ship's main propulsion device in this invention.

[0041] Figure 2 This is a front view schematic diagram of the common base of the ship's main propulsion device in this invention.

[0042] Figure 3 This is a left-side view of the common base of the ship's main propulsion device in this invention.

[0043] Figure 4 This is a three-dimensional structural diagram of the common base of the ship's main propulsion device in this invention.

[0044] Figure 5 This is a schematic diagram of the installation of the lifting ring in an embodiment of the present invention.

[0045] Figure 6 This is a schematic diagram of the three-dimensional position adjustment of the intermediate support in an embodiment of the present invention.

[0046] In the diagram, 1. First platform; 2. Second platform; 3. Lifting ring; 4. Vertical adjusting bolt; 5. Longitudinal adjusting bolt; 6. Lateral adjusting bolt; 7. Intermediate support;

[0047] 101. Top panel; 102. Bottom panel; 103. First elbow plate; 104. Threaded hole plate; 105. First web plate; 106. First transverse connecting plate; 107. First longitudinal connecting plate; 108. Second transverse connecting plate; 109. Second longitudinal connecting plate;

[0048] 201. Panel; 202. Second web plate; 203. Second elbow plate; 204. Third elbow plate; 205. Adjusting pad; 206. Inclined end face. Detailed Implementation

[0049] The technical solution of the present invention will be further described below with reference to specific embodiments:

[0050] A common base for a ship's main propulsion system, such as Figure 1-4 As shown, it includes a first platform 1 and a second platform 2, with the second platform 2 located at one end closer to the first platform 1;

[0051] The first platform 1 has an upper panel 101 and a lower panel 102. The upper panel 101 is used to install the power output system of the ship's main propulsion device, such as a diesel engine, and the lower panel 102 is used to install vibration isolators.

[0052] The second platform 2 has a panel 201 for mounting an intermediate support, and an adjusting pad 205 for supporting the intermediate support is mounted on the panel 201. In this embodiment, the adjusting pad includes four pads, two of which are longer and the other two are shorter. The two longer pads are located diagonally opposite each other, and the two shorter pads are located diagonally opposite each other. The length of the longer adjusting pad is greater than the length of the shorter adjusting pad. The shorter adjusting pad is only provided with mounting bolt holes for mounting the intermediate support, while the longer adjusting pad is provided with mounting bolt holes for mounting the intermediate support and positioning bolt holes for mounting positioning bolts.

[0053] The flatness of the upper panel 101 does not exceed 0.02 mm, and the roughness is Ra3.2; the flatness of the lower panel does not exceed 0.05 mm, and the roughness is Ra12.5; the flatness of the panel 201 does not exceed 0.02 mm, and the roughness is Ra3.2.

[0054] The height of panel 201 is higher than the height of upper panel 101. The height difference between upper panel 101 and panel 201 is equal to Hhd, where H is the height of the crankshaft center of the power output system from the mounting surface of the power output system on the upper panel; h is the height of the input flange center of the intermediate bracket from the mounting surface of the intermediate bracket on the panel; and d is the thickness of the adjusting shim 205.

[0055] More specifically, the first platform 1 includes a left platform and a right platform, which are symmetrically arranged about the crankshaft center of the power output system; the left platform and the right platform have an upper panel 101 and a lower panel 102, respectively; the second platform 2 is mounted across the upper panel 101 of the left platform and the right platform and is arranged near the same end of the left platform and the right platform.

[0056] In one embodiment, a first web plate 105 is provided on the side of the left platform and the right platform that are close to each other. The first web plate 105 is vertically disposed between the upper panel 101 and the lower panel 102. The first web plate 105, the upper panel 101 and the lower panel 102 have the same length.

[0057] Preferably, a plurality of first elbow plates 103 are provided between the upper panel 101 and the lower panel 102, and the first elbow plates 103 are arranged perpendicular to the first web plate 105, the upper panel 101 and the lower panel 102.

[0058] To facilitate hoisting, threaded hole plates 104 for mounting lifting rings 3 are provided at both ends near the first platform 1 between the upper plate 101 and the lower plate 102. The threaded hole plates 104 have threaded holes, and the lifting rings 3 have threaded ends. When hoisting is required, the threaded ends of the lifting rings 3 are fitted into the threaded holes of the threaded hole plates 104; when hoisting is not required, the lifting rings 3 can be removed. Figure 5 As shown.

[0059] At the end of the first platform 1 furthest from the second platform 2, between the left platform and the right platform, a first transverse connecting plate 106 and a first longitudinal connecting plate 107 are provided. A first transverse connecting plate 106 is provided near the upper panel 101 and the lower panel 102 respectively. The first transverse connecting plate 106 near the upper panel 101 is flush with the upper panel 101, and the first transverse connecting plate 106 near the lower panel 102 is flush with the lower panel 102. A first longitudinal connecting plate 107 is vertically provided between the first transverse connecting plates 106 near the upper panel 101 and the lower panel 102. Two parallel first longitudinal connecting plates 107 are provided on both sides of the width of the first transverse connecting plate 106, and the two ends of the length of the first longitudinal connecting plate 107 are vertically connected to the first web plate 105 of the left platform and the right platform respectively.

[0060] A second platform 2 is set at one end of the first platform 1. A second transverse connecting plate 108 and a second longitudinal connecting plate 109 are set between the left platform and the right platform. The second transverse connecting plate 108 is set close to the upper panel 101 and is flush with the upper panel 101. The second longitudinal connecting plate 109 is vertically set on the lower end face of the second transverse connecting plate 108 and the two ends of the length of the second longitudinal connecting plate 109 are respectively vertically connected to the first web plate 105 of the left platform and the right platform.

[0061] In one embodiment, the second platform 2 includes a panel, a second web plate 202, a second elbow plate 203, and a third elbow plate 204 vertically disposed on the lower end face of the panel 201; the second web plate 202 is disposed along the length direction of the second longitudinal connecting plate 109 and corresponds vertically to the second longitudinal connecting plate 109; two parallel second web plates 202 are disposed on the lower end face of the panel 201, and two parallel second longitudinal connecting plates 109 are disposed on the lower end face of the second transverse connecting plate 108, with the upper end of each second longitudinal connecting plate 109 corresponding to a second web plate 202. One end of the second web plate 202 extends from the upper end face of the upper panel 101 of the left platform to the upper end face of the upper panel 101 of the right platform; the second elbow plate 203 is vertically disposed on the lower end face of the panel 201 and located outside the parallel second web plate 202; the third elbow plate 204 is perpendicular to the lower end face of the panel 201 and located between the parallel second web plates 202; at the two ends near the second platform 2, the lower ends of the second elbow plate 203 and the third elbow plate 204 are vertically connected to the upper end face of the upper panel 101 of the left platform and the right platform, respectively, and at the other ends, the lower ends of the second elbow plate 203 and the third elbow plate 204 are vertically connected to the upper end face of the second transverse connecting plate 108.

[0062] Preferably, the two ends of the second web 202 form inclined end faces on the upper panel 101 of the left and right platforms, and the bottom of the inclined end faces extends to the outer edge of the upper panel 101.

[0063] This embodiment also provides a method for installing a ship's main propulsion device, for mounting the ship's main propulsion device on a common base for the ship's main propulsion device, the method comprising:

[0064] S1. Install the power take-off system on the top plate of the first platform;

[0065] The projection line of the output flange of the power output system is provided on the upper panel 101 of the first platform 1. The mounting hole is opened on the upper panel with the projection line of the output flange of the power output system as a reference. The power output system is installed on the upper panel by inserting fastening bolts through the mounting hole.

[0066] Specifically, it includes:

[0067] S11. Using the projection line of the output flange of the power output system as a reference point, machine bolt mounting holes on the top plate according to the position and size of the bolt holes of the power output system base.

[0068] S12. Install non-tight-fit bolts in the bolt mounting holes of the base and top panel of the power take-off system;

[0069] S13. Use a reamer to simultaneously ream the mounting holes of the power output system base and the top panel.

[0070] S14. Machine fastening bolts according to the size and tolerance requirements of the mounting holes, and fix the power output system to the top plate using the fastening bolts.

[0071] S2. Install adjustment pads on the panel of the second platform and install the intermediate bracket on the adjustment pads;

[0072] After placing the intermediate bracket on the panel and adjusting its three-dimensional position, temporarily fix the three-dimensional position of the intermediate bracket. Measure the distance between the mounting surface of the intermediate bracket on the panel and the panel, and adjust the thickness of the shim by increasing the thickness by 0.5mm based on this distance. Install the adjusted shim on the panel and then install the intermediate bracket on the adjusted shim.

[0073] When adjusting the three-dimensional position of the intermediate support 7, the horizontal and vertical positions are adjusted using the vertical adjusting bolt 4, the longitudinal adjusting bolt 5, and the transverse adjusting bolt 6, as follows: Figure 6As shown; install vertical adjusting bolts 4 in the mounting and adjusting screw holes of the intermediate bracket; install baffles of different directions on the panel 201; the baffles have threaded holes corresponding to the longitudinal adjusting bolts 5 and the transverse adjusting bolts 6; install the longitudinal adjusting bolts 5 and the transverse adjusting bolts 6 on the baffles in mutually perpendicular directions; adjust the three-dimensional position of the intermediate bracket 7 by rotating the vertical adjusting bolts 4, the longitudinal adjusting bolts 5 and the transverse adjusting bolts 6; after adjustment, temporarily fix it with C-clamps, etc.; measure the distance between the mounting surface of the intermediate bracket on the panel and the panel using measuring tools such as calipers and feeler gauges.

[0074] After the adjusting shims are machined, they are fitted together, ensuring that there are at least three contact points per square inch on the upper and lower surfaces. Once the shims are positioned correctly, their locations are marked and numbered. The positions of the mounting bolt holes are then marked on the shims using a scriber, and these holes are machined. The shims are then installed according to their numbers and markings, and the intermediate bracket and adjusting shims are mounted on the panel using bolts. Finally, positioning bolt holes are machined on the adjusting shims, and these positioning bolts are tightened to secure them in place.

[0075] S3. Install vibration isolators on the bottom plate;

[0076] S31. Drill holes in the lower panel according to the installation position of the vibration isolator;

[0077] S32. Use fastening bolts to install the vibration isolator at the drilled hole on the lower panel.

[0078] S4. Install a flexible coupling between the power output system and the intermediate support. The two ends of the flexible coupling are respectively connected to the output flange of the power output system and the input flange of the intermediate support.

[0079] After the flexible coupling is installed, the vibration isolator is preloaded. Once the compression of the vibration isolator stabilizes, the compression state of the vibration isolator is temporarily locked.

[0080] S5. Welding and installing the main propulsion unit base onto the hull structure, and installing welding pads on the main propulsion unit base, including:

[0081] S51. Position the main propulsion device base according to the three-dimensional coordinates of the main propulsion device base. The vertical position of the base is the height of the upper surface of the base from the baseline of the hull. The center line of the horizontal position of the base is the position of the distance from the center line of the hull. The longitudinal position of the base is the longitudinal vertical distance between the projection line of the output flange of the power output system and the projection line of the gearbox output end, that is, the projection line of the gearbox output flange.

[0082] S52. The main propulsion unit base is welded to the hull structure, and the flatness of the upper surface of the main propulsion unit base is not greater than 3mm.

[0083] S53. Install welding pads. After polishing the welding pads, use a total station to measure each welding pad to ensure that the flatness of the welding pad is no more than 2mm.

[0084] S6. The common base for the ship's main propulsion system is installed on the main propulsion base;

[0085] S61. After the water stress of the ship is released after it is launched and the ship's draft, heel, and trim are adjusted;

[0086] S62. Perform shaft support reaction force measurement and adjustment until the shaft force measurement meets the requirements;

[0087] S63. Install the gearbox and intermediate bearing. The intermediate bearing is installed outside the shaft system, and the output end of the gearbox is connected to the input end of the shaft system.

[0088] S64. Adjust the position of the common base of the ship's main propulsion system according to the position of the input end of the gearbox, so that the output flange of the intermediate support is aligned with the input end of the gearbox;

[0089] S65. Release the lock on the compression state of the vibration isolator, determine the position of the vibration isolator mounting hole on the welding shim according to the position of the vibration isolator, and after lifting the common base of the ship's main propulsion device, process the vibration isolator mounting hole on the welding shim.

[0090] S66. Adjust the position of the common base of the main propulsion system of the ship again according to the position of the input end of the gearbox, so that the output flange of the intermediate support is aligned with the input end of the gearbox, so that the weight of the common base of the main propulsion system of the ship isolator is completely placed on the vibration isolator, and fix the vibration isolator on the welding gasket with bolts.

[0091] S67. A universal coupling is installed between the output flange of the intermediate support and the input end of the gearbox to realize the power transmission from the power output system, flexible coupling, intermediate support, universal coupling, gearbox to the shaft system.

[0092] This embodiment is merely a further explanation of the present invention and is not intended to limit the present invention. Those skilled in the art can make non-inventive modifications to this embodiment as needed after reading this specification, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A common base for a ship's main propulsion system, characterized in that, It includes a first platform and a second platform, with the second platform located at the end closer to the first platform; The first platform has an upper panel and a lower panel. The upper panel is used to install the power output system of the ship's main propulsion device, and the lower panel is used to install vibration isolators. The second platform has a panel for mounting an intermediate support, and an adjustment pad for supporting the intermediate support is mounted on the panel; The flatness of the upper panel and the lower panel shall not exceed 0.02 mm, and the roughness of both shall be Ra3.2; the flatness of the lower panel shall not exceed 0.05 mm, and the roughness shall be Ra12.

5. The height difference between the upper panel and the panel is equal to Hhd, where H is the height of the crankshaft center of the power output system from the mounting surface of the power output system on the upper panel; h is the height of the input flange center of the intermediate bracket from the mounting surface of the intermediate bracket on the panel; and d is the thickness of the adjusting shim.

2. The common base for a ship's main propulsion system according to claim 1, characterized in that, The first platform includes a left platform and a right platform, which are symmetrically arranged about the crankshaft center of the power output system; the left platform and the right platform each have an upper panel and a lower panel; the second platform spans across the upper panels of the left platform and the right platform and is arranged near the same end of the left platform and the right platform.

3. A common base for a ship's main propulsion system according to claim 2, characterized in that, A first web is provided on the side of the left and right platforms that are close to each other. The first web is vertically arranged between the upper and lower panels, and the first web, the upper panel and the lower panel have the same length. Several first elbow plates are also provided between the upper panel and the lower panel, and the first elbow plates are set perpendicular to the first web plate, the upper panel and the lower panel.

4. A common base for a ship's main propulsion system according to claim 3, characterized in that, Threaded hole plates for mounting lifting rings are provided at both ends of the upper and lower plates near the first platform.

5. A common base for a ship's main propulsion system according to claim 3, characterized in that, At the end of the first platform away from the second platform, between the left platform and the right platform, there is a first transverse connecting plate and a first longitudinal connecting plate. A first transverse connecting plate is provided near the upper panel and the lower panel respectively. The first transverse connecting plate near the upper panel is flush with the upper panel, and the first transverse connecting plate near the lower panel is flush with the lower panel. A first longitudinal connecting plate is vertically provided between the first transverse connecting plates near the upper panel and the lower panel. Two parallel first longitudinal connecting plates are provided on both sides of the width of the first transverse connecting plate, and the two ends of the length of the first longitudinal connecting plate are vertically connected to the first web of the left platform and the right platform respectively.

6. A common base for a ship's main propulsion system according to claim 5, characterized in that, At one end of the first platform, a second platform is set. A second transverse connecting plate and a second longitudinal connecting plate are set between the left platform and the right platform. The second transverse connecting plate is set close to the upper panel and is flush with the upper panel. The second longitudinal connecting plate is set vertically on the lower end face of the second transverse connecting plate and the two ends of the length of the second longitudinal connecting plate are respectively vertically connected to the first web plate of the left platform and the right platform.

7. A common base for a ship's main propulsion system according to claim 6, characterized in that, The second platform includes a panel, a second web plate, a second elbow plate, and a third elbow plate, which are vertically arranged on the lower end face of the panel. The second web plate is arranged along the length direction of the second longitudinal connecting plate and corresponds vertically to the second longitudinal connecting plate. The two second web plates are arranged in parallel, and the two second longitudinal connecting plates are arranged in parallel. One end of the second web plate extends from the upper end face of the top plate of the left platform to the upper end face of the upper panel of the right platform. The second elbow plate is vertically arranged on the lower end face of the panel and located outside the parallel second web plates. The third elbow plate is perpendicular to the lower end face of the panel and located between the parallel second web plates. The lower ends of the second elbow plate and the third elbow plate are vertically connected to the upper end face of the upper panel of the left platform and the right platform near the two ends of the second platform. The lower ends of the second elbow plate and the third elbow plate are vertically connected to the upper end face of the second transverse connecting plate at other positions.

8. A common base for a ship's main propulsion system according to claim 7, characterized in that, The two ends of the second web form inclined end faces on the upper plates of the left and right platforms, and the bottom of the inclined end faces extends to the outer edge of the upper plate.

9. A method for installing a ship's main propulsion system, characterized in that, The method for mounting a ship's main propulsion system on a common base for a ship's main propulsion system as described in any one of claims 1-8 includes: S1. Install the power take-off system on the top plate of the first platform; The projection line of the output flange of the power output system is set on the top plate of the first platform. The mounting holes are opened on the top plate with the projection line of the output flange of the power output system as a reference. The power output system is installed on the top plate by inserting fastening bolts through the mounting holes. S2. Install adjustment pads on the panel of the second platform and install the intermediate bracket on the adjustment pads; After placing the intermediate bracket on the panel and adjusting its three-dimensional position, temporarily fix the three-dimensional position of the intermediate bracket. Measure the distance between the mounting surface of the intermediate bracket on the panel and the panel, and adjust the thickness of the shim by increasing the thickness by 0.5mm based on this distance. Install the adjusted shim on the panel and then install the intermediate bracket on the adjusted shim. S3. Install vibration isolators on the bottom plate; S4. Install a flexible coupling between the power output system and the intermediate support. The two ends of the flexible coupling are respectively connected to the output flange of the power output system and the input flange of the intermediate support. After the flexible coupling is installed, the vibration isolator is preloaded. Once the compression of the vibration isolator is stable, the compression state of the vibration isolator is temporarily locked. S5. Weld and install the main propulsion device base on the hull structure, and install welding pads on the main propulsion device base; S6. The common base for the ship's main propulsion system is installed on the main propulsion base; S61. After the water stress of the ship is released after it is launched and the ship's draft, heel, and trim are adjusted; S62. Perform shaft support reaction force measurement and adjustment until the shaft force measurement meets the requirements; S63. Install the gearbox and intermediate bearing. The intermediate bearing is installed outside the shaft system, and the output end of the gearbox is connected to the input end of the shaft system. S64. Adjust the position of the common base of the ship's main propulsion system according to the position of the input end of the gearbox, so that the output flange of the intermediate support is aligned with the input end of the gearbox; S65. Release the lock on the compression state of the vibration isolator, determine the position of the vibration isolator mounting hole on the welding shim according to the position of the vibration isolator, and after lifting the common base of the ship's main propulsion device, process the vibration isolator mounting hole on the welding shim. S66. Adjust the position of the common base of the main propulsion system of the ship again according to the position of the input end of the gearbox, so that the output flange of the intermediate support is aligned with the input end of the gearbox, so that the weight of the common base of the main propulsion system of the ship isolator is completely placed on the vibration isolator, and fix the vibration isolator on the welding gasket with bolts. S67. Install a universal coupling between the output flange of the intermediate support and the input end of the gearbox.

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