CN107628218B - Pouring damping device for stern bearing and preparation method - Google Patents
Pouring damping device for stern bearing and preparation method Download PDFInfo
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Abstract
The invention relates to a stern bearing pouring damping device and a preparation method thereof, belonging to the technical field of ship vibration reduction devices. In the damping device, an outer bushing is sleeved on an inner bushing, a flange is arranged at one end of the inner bushing, and a casting body is cast and solidified between the inner bushing and the outer bushing; the damping device is arranged between the hub of the stern bearing and the stern bearing; bolts are respectively connected with a shaft hub of the stern bearing and the stern bearing; the inner and outer bushings are consistent with the shaft hub material of the stern bearing, the casting material is epoxy casting material, and after curing: the tensile strength is more than or equal to 34MPa, the compressive strength is more than or equal to 100MPa, and the unnotched impact strength of the cantilever beam is more than or equal to 1.7kJ/m2The heat distortion temperature is more than or equal to 70 ℃, and the Babbitt hardness is more than or equal to 35. The damping device is easy to disassemble, overhaul and replace; the isolation efficiency of the force transmission rate is more than 50 percent, the vibration of the stern bearing can be effectively controlled to be transmitted to the outside of the ship body, and the low-noise navigation of the ship is realized; can be poured and processed in a factory and is not influenced by the environmental temperature.
Description
Technical Field
The invention relates to a stern bearing pouring damping device and a preparation method thereof, and the device can effectively control the vibration of a stern bearing to be transmitted to the outside of a ship body on the basis of ensuring that the supporting strength is met, so that the low-noise navigation of the ship is realized, and belongs to the technical field of ship vibration reduction devices.
Background
With the development of ship technology, the requirements on navigation comfort and concealment are higher and higher. According to the requirements of alignment and bearing, the ship shafting equipment and the ship body base are rigidly connected, and a shock absorber cannot be installed, so that effective shock absorption and vibration isolation measures are lacked. The large ship propeller has large mass, the stern bearing load distribution is extremely uneven, and the large ship propeller is influenced by various factors such as shafting processing, centering and hull deformation, and the working conditions are quite severe, so that mechanical vibration and noise generated during shafting operation are directly transmitted to a hull through a support bearing such as the stern bearing and the like and radiate sound waves outwards, and the propeller becomes a main reason for transmitting the noise outside the ship by the shafting.
At present, the ship industry has designed a stern portion bearing self-centering device to stern portion screw bearing, the device is with in certain length between inner liner and the outer liner with the rubber layer vulcanization, the device main function utilizes the soft characteristic of rubber, realizes that screw bearing load distributes evenly, reduces bearing wear rate, utilizes the deformation on rubber layer simultaneously, can reduce the transmission of screw bearing to boats and ships stern portion structure. Because the ship shafting equipment and the hull base are rigidly connected and flexible supports such as a shock absorber cannot be installed, the self-centering device for the stern bearing can only be installed on the propeller bearing and cannot be installed on other stern bearings, and the function is limited.
At present, in some ships, starting from the requirements of convenient installation and realization of centering and positioning without boring a shaft hub hole, a layer of epoxy resin is directly poured between a stern bearing and a shaft hub, which is shown in the ship standard CB*The method requires that the casting is carried out on a real ship, the environment temperature of the casting has higher requirement for keeping the wall of the casting cavity not lower than 30 ℃, and the method is quite difficult to realize for a plurality of large ships which have construction period limitation requirements and must be built in the north. In addition, because the pouring body and the ship body are directly poured into a whole in the method, the pouring reliability of the method is required to be the same as the service life of the ship, and once the actual pouring operation fails or the performance of the material is reduced after the material is used for a long time, the overhauling and the disassembling are quite difficult; meanwhile, the method cannot be used for special vibration and noise reduction design, and the vibration reduction effect cannot be controlled.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a stern bearing pouring damping device which can solve the problem that the vibration isolation measures of stern bearings are insufficient due to the fact that the conventional stern bearing self-centering device cannot be applied to all stern bearings; the problems that the requirement on the casting environment is high, the overhaul and the disassembly are difficult, and the effective vibration isolation design cannot be realized in the prior art that epoxy resin is directly cast between a stern bearing and a shaft hub are solved.
The second purpose of the invention is to provide a preparation method of the stern bearing pouring damping device.
In order to achieve the purpose of the invention, the following technical scheme is provided.
A stern bearing casting damping device comprises an inner bushing, a casting body and an outer bushing.
The inner bushing and the outer bushing are both cylindrical, one end of each cylindrical.
The thickness of the cast body is preferably 18mm to 25 mm.
After the casting body is solidified, in the damping device, a circle of through holes and a circle of threaded holes are distributed on the flanges of the inner bushing, the casting body and the outer bushing along the circumference, and are preferably uniformly distributed.
The damping device is arranged between the hub of the stern bearing and the stern bearing; and a first bolt with an isolation sleeve is adopted to pass through the through hole to connect a flange on the damping device with a hub of a stern bearing, and a second bolt is adopted to pass through the threaded hole to connect the flange on the damping device with the stern bearing.
Interior bush and outer bush material are unanimous with stern portion bearing shaft hub material, and the pouring body material is epoxy pouring material, but the similar steel gasket of solidification back uses, does not have obvious deformation in the use, and the performance index is after the solidification:
the tensile strength is more than or equal to 34MPa, the compressive strength is more than or equal to 100MPa, and the unnotched impact strength of the cantilever beam is more than or equal to 1.7kJ/m2The heat distortion temperature is more than or equal to 70 ℃, and the Babbitt hardness is more than or equal to 35.
The preferred casting material is Jiangsu Beilun JN-120A casting epoxy gasket or Germany EPOCAST 36 casting epoxy gasket.
Preferably, the material of the isolation sleeve is reinforced polytetrafluoroethylene.
The invention relates to a preparation method of a stern bearing pouring damping device, which comprises the following steps:
(1) assembling and positioning: assembling and positioning the clean inner bushing and the clean outer bushing by using a positioning tool in a vertical pouring mode;
wherein, the clean inner lining and the clean outer lining can be obtained by adopting the following method:
polishing and derusting the surfaces of the inner bushing and the outer bushing, which are contacted with the casting body, by using an electric steel brush; the inner bushing and the outer bushing are cleaned by acetone respectively, particularly, the surfaces in contact with the casting body are cleaned in a key mode, dirt on the inner bushing and the outer bushing, such as dirty oil, iron, dust and the like in the machining process, is thoroughly removed, the casting of the casting body is carried out as early as possible after the cleaning is finished, and the situation that the casting surface is polluted again after the casting body is stored for a long time is avoided.
(2) First sealing treatment: and sealing the flange end faces of the inner bushing and the outer bushing which are qualified in assembly and positioning, spot-welding a circle of sheet iron on the flange end faces of the inner bushing and the outer bushing, and sealing the peripheral gap.
(3) Preparing a casting material: and (3) uniformly mixing the epoxy casting material and the curing agent thereof in a container and preventing bubbles from being brought in to obtain a uniformly mixed casting material.
(4) Pouring: and the casting body material obtained after uniform mixing freely flows into the casting gap between the inner bushing and the outer bushing along the outer wall of the inner bushing in a thin strip shape, and can be cast in multiple times according to the size of the casting gap, and vacuumizing and defoaming are needed after each casting.
(5) Primary curing: after the vacuum-pumping and defoaming are finished, curing at 20-25 ℃, and if the casting is carried out in a plurality of times, carrying out subsequent casting after 12-24 hours from the first casting.
(6) And (3) curing: and (3) carrying out final pouring and curing on the end faces of the inner bushing and the outer bushing, wherein the curing temperature is as follows: curing for 48h at 20-25 ℃ to achieve the use strength of the material.
(7) And (3) sample detection: and according to the specified index requirements, the performance of the casting body sample prepared simultaneously in the casting process is detected by referring to related standards, such as GB1041, GB1040, GB1843, GB1634 and the like.
(8) Removing the seal: and after the casting body is solidified, removing the first sealing treatment in the casting process.
(9) And (3) pressure testing: and carrying out a hydrostatic test on the illegal flange end face of the damping device, wherein the test pressure is 0.5MPa, the test time is 10min, and the flange end face of the damping device is qualified without water seepage.
(10) Finish machining: and carrying out finish machining treatment on the inner hole and the outer circle of the damping device after pouring according to the requirements of a design drawing.
(11) And (3) second sealing treatment: after finishing finish machining, winding the flange end face of the damping device by adopting a casting material and degreased glass cloth, wherein the winding thickness is 2-3 mm; and (3) coating the whole non-flange end face of the damping device with a casting material, wherein the coating thickness is 1-2 mm, and sealing the end face to obtain the cast damping device for the stern bearing.
Advantageous effects
1. The invention provides a stern bearing pouring damping device, which considers that the installation and the maintenance are convenient on a ship, and the replacement of a stern bearing is required during the middle maintenance and the overhaul, and because the shaft system of a high-power ship has large transmission torque, the stern bearing has large bearing pressure and long axial dimension, in order to improve the connection strength and ensure the safe operation of the stern bearing, the damping device adopts a first bolt with an isolation sleeve to be connected with the shaft hub of the stern bearing, adopts a second bolt to be connected with the stern bearing and is detachably connected, and the connection structure type can ensure enough large transmission torque capacity on the basis of meeting the enough support strength of shaft system equipment and further obstruct the transmission of mechanical vibration and noise;
2. the invention provides a stern bearing pouring damping device, which utilizes the different acoustic impedances of a pouring body material and steel on the basis of ensuring that the supporting strength is met and no obvious deformation exists, exerts the vibration attenuation and noise reduction potential of the pouring body, reduces the vibration amplification amount during resonance by an energy consumption mechanism which is formed by the pouring body material, a shafting, a stern structure and the like, attenuates the vibration energy transmitted to a ship body through the shafting and a supporting stern bearing thereof, reduces the vibration response near the resonance frequency, reduces the free vibration of the structure or the vibration amplitude caused by impact, improves the dynamic stability of the shafting and the stern structure and reduces the noise transmission capability, and realizes the low-noise navigation of a ship;
3. the invention provides a stern bearing pouring damping device which is detachable, is easy to detach, overhaul and replace, has a good function of isolating vibration transmission, has the isolation efficiency of the force transmission rate of more than 50 percent, and effectively attenuates the vibration energy transmitted to a ship body through a shaft system and a stern bearing supported by the shaft system;
4. the invention provides a stern bearing pouring damping device and a preparation method thereof, wherein the damping device and the preparation method thereof can realize pouring and processing in a factory, can be installed and used at any time even in a large ship produced in the north, are not influenced by environmental temperature, and effectively avoid risks caused by field pouring failure.
Drawings
Fig. 1 is a schematic structural diagram of a stern bearing pouring damping device provided by the invention.
FIG. 2 is a schematic view of the installation of a stern bearing cast damping device according to the present invention;
fig. 3 is a schematic diagram of the general arrangement of the stern bearing pouring damping device applied to a ship.
Wherein, 1-inner lining, 2-casting body, 3-outer lining, 4-stern bearing shaft hub, 5-isolation sleeve, 6-first bolt, 7-second bolt, 8-stern bearing, 9-propeller, 10-stern shaft, 11-hull
Detailed Description
The invention is further described below with reference to the figures and examples of the specification.
Example 1
As shown in fig. 1, a stern bearing cast damping device comprises an inner liner 1, a cast body 2 and an outer liner 3.
The inner bushing 1 and the outer bushing 3 are both cylindrical with flanges at one end, the outer bushing 3 is sleeved on the inner bushing 1, and the casting body 2 is solidified between the inner bushing 1 and the outer bushing 3 in a casting mode.
After the casting body 2 is solidified, in the damping device, a circle of through holes and a circle of threaded holes are respectively and uniformly distributed on the flanges of the inner bushing 1, the casting body 2 and the outer bushing 3 along the circumference.
Fig. 3 is a schematic diagram of the general arrangement of the damping device in the hull 11, showing the propeller 9, the stern bearing 8, the specific positions of the damping device, the stern bearing hub 4 and the stern shaft 10 in the hull 11, and it can be seen that the damping device is installed between the stern bearing hub 4 and the stern bearing 8; as shown in fig. 2, the first bolt 6 that adopts to take isolation sleeve 5 passes through the through-hole will flange and stern portion bearing shaft hub 4 on the damping device are connected, adopt second bolt 7 to pass through the screw hole will flange and stern portion bearing 8 on the damping device are connected, mechanical vibration and noise that produce when preventing the shafting operation are direct transmit hull 11 and outside radiation sound wave through support bearings such as stern portion bearing 8, interior bush 1 thickness is 36mm, 3 thickness of outer bush are 32mm, interior bush 1 and outer bush material are unanimous with stern portion bearing shaft hub material, the thickness of pouring body 2 is 25mm, the pouring body material is Jiangbianlun JN-120A pouring type epoxy gasket, there is not obvious deformation in the use, the performance index after the solidification is:
the tensile strength is more than or equal to 34MPa, the compressive strength is more than or equal to 117MPa, and the unnotched impact strength of the cantilever beam is more than or equal to 1.7kJ/m2The heat distortion temperature is more than or equal to 70 ℃, and the Babbitt hardness is more than or equal to 35;
elastic modulus (E) ═ 5.4 GPa; density (p) 1620kg/m3(ii) a Poisson's ratio (μ) ═ 0.337.
The material of the distance sleeve 5 is reinforced polytetrafluoroethylene.
The preparation method of the stern bearing pouring damping device comprises the following steps:
(1) assembling and positioning: a vertical pouring mode is adopted, and a positioning tool is used for assembling and positioning the clean inner bushing 1 and the clean outer bushing 3 in a factory;
wherein, the clean inner bush 1 and the clean outer bush 3 are obtained by adopting the following method:
the surfaces of the inner bushing 1 and the outer bushing 3, which are contacted with the casting body 2, are respectively polished by an electric steel brush for rust removal; the inner bushing 1 and the outer bushing 3 are respectively cleaned by acetone, particularly the surfaces in contact with the casting body 2 are mainly cleaned, dirty oil, iron, dust and the like in the processing process of the inner bushing 1 and the outer bushing 3 are thoroughly removed, the casting body 2 is cast after cleaning is finished, and the situation that the casting surfaces are polluted again after long-time storage is avoided.
(2) First sealing treatment: and sealing the flange end faces of the inner bushing 1 and the outer bushing 3 which are qualified in assembly and positioning, spot-welding a circle of sheet iron on the flange end faces of the inner bushing 1 and the outer bushing 3, and sealing the peripheral gap.
(3) Preparing a casting material: mixing the epoxy casting material and the curing agent thereof in a container, rotating by using a stirring impeller to uniformly mix the epoxy casting material and the curing agent thereof, wherein a stirring head cannot rise to expose the liquid surface in the stirring process to prevent bubbles from being brought in, so as to obtain the uniformly mixed casting material.
(4) Pouring: and (3) freely flowing the obtained casting material into a casting gap between the inner bushing 1 and the outer bushing 3 along the outer wall of the inner bushing 1 in a thin strip shape, and performing fractional casting according to the size of the casting gap, wherein vacuumizing and defoaming are required after each casting.
(5) Primary curing: after the vacuum pumping and defoaming are finished, curing is carried out at 20 ℃, the casting is carried out in multiple times, and after 12 hours from the first casting, the subsequent casting is carried out.
(6) And (3) curing: and (3) carrying out final pouring and curing on the end surfaces of the inner bushing 1 and the outer bushing 3, wherein the curing temperature is as follows: curing for 48h at 20 ℃ to achieve the service strength of the material.
(7) And (3) sample detection: and according to the specified index requirements, carrying out performance detection on the reference standards GB1041, GB1040, GB1843 and GB1634 of the casting body samples prepared simultaneously in the casting process.
(8) Removing the seal: and after the casting body 2 is solidified, removing the first sealing treatment in the casting process.
(9) And (3) pressure testing: and carrying out a hydrostatic test on the illegal flange end face of the damping device, wherein the test pressure is 0.5MPa, the test time is 10min, and the flange end face of the damping device is qualified without water seepage.
(10) Finish machining: and carrying out finish machining treatment on the inner hole and the outer circle of the damping device after pouring according to the requirements of a design drawing.
(11) And (3) second sealing treatment: after finishing finish machining, winding the flange end face of the damping device by adopting a casting material and degreased glass cloth, wherein the winding thickness is 2 mm; and (3) coating the whole non-flange end face of the damping device with a casting material, wherein the coating thickness is 1mm, and sealing the end face to obtain the stern bearing casting damping device.
Through detection, the damping device is applied to ships in China, vibration transmitted through a stern structure of a ship body can be effectively reduced, the isolation efficiency of the force transfer rate is 74.22%, and the calculation formula of the isolation efficiency of the force transfer rate is as follows: i ═ 1-TA)×100％；
Wherein: i is the isolation efficiency of the force transmissibility, TAFor the force transmission rate, the calculation method is described in "chunkoka, hailin," ship mechanical vibration control ", pages 25 to 26, national defense industry press, 2006.1.
Example 2
As shown in fig. 1, in a stern bearing casting damping device, the thickness of an inner bushing 1 is 36mm, the thickness of an outer bushing 3 is 32mm, the thickness of a casting body 2 is 18mm, the casting body is made of a germany EPOCAST 36 epoxy gasket, and the performance indexes are as follows:
the tensile strength is more than or equal to 49.4MPa, the compressive strength is more than or equal to 164MPa, and the unnotched impact strength of the cantilever beam is more than or equal to 2.0kJ/m2The heat distortion temperature is more than or equal to 90 ℃, and the Babbitt hardness is more than or equal to 55;
elastic modulus (E) ═ 5.61 GPa; density (rho) 1670kg/m3(ii) a Poisson's ratio (μ) 0.337;
the rest of the description is the same as the description in the cast stern bearing damping device described in example 1.
The preparation method of the stern bearing pouring damping device comprises the following steps:
(1) assembling and positioning: same as example 1, step (1).
(2) First sealing treatment: same as example 1, step (2).
(3) Preparing a casting material: same as example 1, step (3).
(4) Pouring: same as example 1, step (4).
(5) Primary curing: after the vacuum-pumping and defoaming are finished, curing at 25 ℃, pouring for several times, and after 24 hours from the first pouring, carrying out subsequent pouring.
(6) And (3) curing: and finally pouring and curing the end surfaces of the inner bushing 1 and the outer bushing 3 at the curing temperature of 25 ℃ for 48h to achieve the use strength of the material.
(7) And (3) sample detection: same as example 1, step (7).
(8) Removing the seal: same as example 1, step (8).
(9) And (3) pressure testing: same as example 1, step (9).
(10) Finish machining: same as example 1, step (10).
(11) And (3) second sealing treatment: after finishing finish machining, winding the flange end face of the damping device by adopting a casting material and degreased glass cloth, wherein the winding thickness is 3 mm; and (3) coating the whole non-flange end face of the damping device with a casting material, wherein the coating thickness is 2mm, and sealing the end face to obtain the stern bearing casting damping device.
Through detection, the damping device is applied to ships in China, vibration transmitted through a stern structure of a ship body can be effectively reduced, the isolation efficiency of the transfer rate is 55.48%, and the isolation efficiency calculation formula of the force transfer rate is as follows: i ═ 1-TA)×100％；
Wherein: i is the isolation efficiency of the force transmissibility, TAFor the force transmission rate, the calculation method is described in "chunkoka, hailin," ship mechanical vibration control ", pages 25 to 26, national defense industry press, 2006.1.
Claims (7)
1. The utility model provides a stern portion bearing pouring damping device which characterized in that: the damping device comprises an inner lining (1), a casting body (2) and an outer lining (3);
the inner bushing (1) and the outer bushing (3) are both cylindrical, one end of each cylindrical;
after the casting body (2) is solidified, in the damping device, a circle of through holes and a circle of threaded holes are respectively distributed on the flanges of the inner lining (1), the casting body (2) and the outer lining (3) along the circumference;
the damping device is arranged between a stern bearing shaft hub (4) and a stern bearing (8); a flange on the damping device is connected with a stern bearing axle hub (4) through a through hole by adopting a first bolt (6) with an isolation sleeve (5), and the flange on the damping device is connected with a stern bearing (8) through a threaded hole by adopting a second bolt (7);
the inner lining material and the outer lining material are consistent with the shaft hub material of the stern bearing, the casting material is epoxy casting material, and the performance index after curing is as follows:
the tensile strength is more than or equal to 34MPa, the compressive strength is more than or equal to 100MPa, and the unnotched impact strength of the cantilever beam is more than or equal to 1.7kJ/m2The heat distortion temperature is more than or equal to 70 ℃, and the Babbitt hardness is more than or equal to 35;
the thickness of the casting body (2) is 18mm to 25 mm.
2. The stern bearing cast damping device of claim 1, wherein: the flanges of the inner lining (1), the pouring body (2) and the outer lining (3) are respectively and uniformly distributed with a circle of through holes and a circle of threaded holes along the circumference.
3. The stern bearing cast damping device of claim 1, wherein: the casting body material is Jiangsu Beilun JN-120A casting type epoxy gasket or Germany EPOCAST 36 casting type epoxy gasket.
4. The stern bearing cast damping device of claim 1, wherein: the material of the isolation sleeve (5) is reinforced polytetrafluoroethylene.
5. The stern bearing cast damping device of claim 2, wherein: the casting body material is a Jiangsu Beilun JN-120A casting type epoxy gasket or a Germany EPOCAST 36 casting type epoxy gasket; the material of the isolation sleeve (5) is reinforced polytetrafluoroethylene.
6. A method for preparing a stern bearing cast damping device as claimed in any one of claims 1 to 5, wherein: the method comprises the following steps:
(1) assembling and positioning: a vertical pouring mode is adopted, and a positioning tool is used for assembling and positioning the clean inner bushing (1) and the clean outer bushing (3);
(2) first sealing treatment: sealing the flange end faces of the inner bushing (1) and the outer bushing (3) which are assembled and positioned qualified, spot-welding a circle of sheet iron on the flange end faces of the inner bushing (1) and the outer bushing (3), and sealing the peripheral gap;
(3) preparing a casting material: uniformly mixing the epoxy casting material and the curing agent thereof in a container and preventing bubbles from being brought in to obtain a uniformly mixed casting material;
(4) pouring: the casting material obtained after uniform mixing freely flows into the casting gap between the inner bushing (1) and the outer bushing (3) along the outer wall of the inner bushing (1) in a thin strip shape, and can be cast in multiple times according to the size of the casting gap, and vacuumizing and defoaming are needed after each casting;
(5) primary curing: after the vacuum pumping and defoaming are finished, curing at 20-25 ℃, and if the casting is carried out in a fractional casting mode, carrying out subsequent casting after 12-24 hours from the first casting;
(6) and (3) curing: and (3) carrying out final pouring and curing on the end faces of the inner bushing (1) and the outer bushing (3), wherein the curing temperature is as follows: curing for 48 hours at the temperature of between 20 and 25 ℃ to achieve the use strength of the material;
(7) and (3) sample detection: according to the specified index requirements, the performance of a casting body sample prepared simultaneously in the casting process is detected by referring to the relevant standards;
(8) removing the seal: after the casting body (2) is solidified, removing the first sealing treatment in the casting process;
(9) and (3) pressure testing: carrying out a hydraulic test on the illegal flange end face of the damping device, wherein the test pressure is 0.5MPa, the test time is 10min, and the flange end face of the damping device is qualified when no water seepage phenomenon occurs;
(10) finish machining: carrying out finish machining treatment on the inner hole and the outer circle of the damping device after pouring according to the requirements of a design drawing;
(11) and (3) second sealing treatment: after finishing finish machining, winding the flange end face of the damping device by adopting a casting material and degreased glass cloth, wherein the winding thickness is 2-3 mm; and (3) coating the whole non-flange end face of the damping device with a casting material, wherein the coating thickness is 1-2 mm, and sealing the end face to obtain the stern bearing casting damping device.
7. The method for preparing a stern bearing cast damping device according to claim 6, wherein the method comprises the following steps: clean inner and outer liners (1, 3) are obtained by the following method:
the surfaces of the inner lining (1) and the outer lining (3) which are contacted with the casting body (2) are respectively polished by an electric steel brush for rust removal; the inner lining (1) and the outer lining (3) are respectively cleaned by acetone, the surface contacted with the casting body (2) is intensively cleaned, and dirt on the inner lining (1) and the outer lining (3) is thoroughly removed.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109455286A (en) * | 2018-11-15 | 2019-03-12 | 中国船舶重工集团公司第七〇九研究所 | A kind of ship stern support device of multifunctional unit |
| CN109533260B (en) * | 2018-11-19 | 2021-05-28 | 中国舰船研究设计中心 | Ship stern bearing restraint isolation structure device |
| CN109466695A (en) * | 2018-12-03 | 2019-03-15 | 浙江国际海运职业技术学院 | Stern tube mounting process |
| CN110758676B (en) * | 2019-10-15 | 2021-06-25 | 江苏新扬子造船有限公司 | Epoxy tightness construction process method for stern tube |
| CN114260662B (en) * | 2021-11-11 | 2023-05-16 | 武汉船用机械有限责任公司 | Shafting manufacturing method |
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| CN107628218A (en) | 2018-01-26 |
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