Installation method of permanent magnet shaft generator of large container ship

Abstract

The invention relates to the field of ship building and repairing, in particular to a method for installing a permanent magnet shaft generator of a large container ship, which comprises the following steps of: S1, investigating and measuring the state and data of an original ship intermediate shaft of the large container ship; s2, for the large container ship in a floating state, a tail shaft is pulled backwards, and the middle shaft of the original ship is dismounted under the condition that the sealing of the tail shaft is ensured; s3, a process hole is formed in a cabin above the intermediate shaft of the original ship, so that the intermediate shaft of the original ship can be transported out of the cabin of the large container ship through the process hole; s4, a front middle bearing of the large container ship is moved forwards, a permanent magnet shaft generator base is installed, and meanwhile a rear shaft of the permanent magnet shaft generator is hoisted into a cabin of the large container ship to be placed; and S5, after the shaft generator front shaft, the shaft generator stator and the shaft generator rotor are assembled, the shaft generator front shaft, the shaft generator stator and the shaft generator rotor are integrally hoisted into a cabin of the large container ship and placed on a shaft generator base.

Description

Technical Field

[0001] The present invention relates to the field of shipbuilding and repair, and more particularly to a method for installing a permanent magnet shaft generator on a large container ship. Background Art

[0002] At present, when transporting goods in bulk between coastal countries or regions, sea transportation is generally used. In this case, large container ships are needed to transport containers loaded with goods.

[0003] Since the transportation value of large container ships is very high, it is necessary to find ways to reduce the maintenance period when installing permanent magnet shaft generators. Among them, the docking period is the largest unit price in the maintenance cost, so it is necessary to reduce the docking period as much as possible to save maintenance costs.

[0004] At present, the permanent magnet shaft generators of large container ships have the following characteristics: high power, large size, and strong permanent magnet attraction, which bring great difficulties to the installation and adjustment of the permanent magnet shaft generators. Therefore, it is necessary to propose an installation method for permanent magnet shaft generators of large container ships that solves the above problems. Summary of the Invention

[0005] In order to overcome at least one defect (shortcoming) of the above-mentioned prior art, the present invention provides a method for installing a permanent magnet shaft generator on a large container ship.

[0006] To solve the above technical problems, the technical solution of the present invention is as follows: A method for installing a permanent magnet shaft generator on a large container ship, comprising the following steps:

[0007] S1, inspect and measure the status and data of the original intermediate shaft of a large container ship;

[0008] S2: For large container ships in a floating state, pull the tail shaft backwards and remove the original ship's intermediate shaft while ensuring the tail shaft is sealed;

[0009] S3, a process hole is opened in the engine room above the original ship's intermediate shaft, so that the original ship's intermediate shaft can be transported out of the engine room of the large container ship through the process hole;

[0010] S4, shift the front middle bearing of the large container ship forward, install the permanent magnet shaft generator base and hoist the rear shaft of the permanent magnet shaft generator into the engine room of the large container ship for placement;

[0011] S5, after assembling the shaft generator front shaft, the shaft generator stator and the shaft generator rotor, hoist the entire shaft into the engine room of the large container ship and place it on the shaft generator base;

[0012] S6, after placing the permanent magnet shaft generator in place, adjust the shaft generator front shaft and the shaft generator rear shaft so that the flanges of the permanent magnet shaft generator, the shaft generator front shaft and the shaft generator rear shaft are aligned and then clamped, and process flange bolt holes and flange bolts on each flange;

[0013] S7: When the flanges of the permanent magnet shaft generator, the shaft generator front shaft, and the shaft generator rear shaft are installed to meet the requirements of the cranking, the tail shaft seal is checked by cranking to meet the requirements of large container ship undocking;

[0014] S8, controlling the large container ship to undock, and then continuing to process the remaining flange holes and bolts on the large container ship, and tightening the flange bolts. After the flange connection is completed, adjust the load of each bearing so that the load of each bearing meets the design requirements;

[0015] Furthermore, the step S1 includes the following steps:

[0016] S11, respectively measuring the old axis position parameters, old shafting load lifting parameters, old axis opening offset parameters, main engine opening difference parameters and main engine main bearing load lifting parameters of the original ship intermediate shaft of the large container ship;

[0017] S12, place temporary supports under the ends of the shafts that need to be disassembled.

[0018] Furthermore, the step S2 includes the following steps:

[0019] S21, remove the original ship's intermediate shaft, and pull the tail shaft back 8-12mm while ensuring the tail shaft is sealed;

[0020] S22, uses tooling to lock the tail shaft after it is pulled backward to prevent water flow from hitting the propeller and causing the tail shaft to rotate.

[0021] Furthermore, step S3 includes the following steps:

[0022] S31, drill a process hole above the original ship's intermediate shaft, and make the process hole shorter than the original ship's intermediate shaft;

[0023] S32: Keep the floating crane hook stationary, tighten the 50T hoist to rotate the original ship's intermediate shaft 18-40 degrees, then tilt and lift it. Then use the lifting equipment to transport the original ship's intermediate shaft through the process hole out of the engine room of the large container ship.

[0024] Furthermore, the step S4 includes the following steps:

[0025] S41, shifting the front center bearing forward on large container ships;

[0026] S42, remove the foot block at the bottom of the front middle bearing to lower the height of the front middle bearing;

[0027] S43, while installing the permanent magnet shaft generator base, the rear shaft of the permanent magnet shaft generator is hoisted into the engine room of a large container ship for placement.

[0028] Furthermore, step S5 includes the following steps:

[0029] S51, assembling the front shaft of the shaft generator with the shaft generator stator and the shaft generator rotor;

[0030] S52, add auxiliary fixing fixtures to the shaft and generator stator and generator rotor to increase stability;

[0031] S53, after assembling the shaft generator front shaft, the shaft generator stator and the shaft generator rotor, hoist the whole into the engine room of the large container ship and place it on the shaft generator base.

[0032] Furthermore, the step S6 includes the following steps:

[0033] S61, after the permanent magnet shaft generator is placed in place, the shaft generator rear shaft placed on the side of the engine room of the large container ship is also placed in place;

[0034] S62: Place temporary supports at the front and rear ends of the front and rear axles of the engine. Use the position adjustment bolts at the engine base and the temporary supports to coordinately adjust the positions of the front and rear axles of the engine, aligning the flanges.

[0035] S63, lock the generator stator and rotor with fixed blocks. Use the main engine cranking at the front end of the generator stator and rotor, and use a sling to pull the propeller at the rear end, so that the front and rear shafts rotate on the bearings and temporary supports to align the bolt holes of each pair of flanges.

[0036] S64, align the flanges between the clamping shaft and the front and rear shafts.

[0037] Furthermore, step S7 includes the following steps:

[0038] S71, evenly machine half of the bolt holes and bolts on the flanges of the permanent magnet shaft generator, the shaft generator front shaft, and the shaft generator rear shaft, and tighten them to meet the turning requirements;

[0039] S72, reinstall all disassembled intermediate bearings and apply lubricating oil;

[0040] S73, adjust the height of the front intermediate bearing anchor block according to the reinstalled intermediate bearing, and make a new temporary block to temporarily fix the intermediate bearing;

[0041] S74, remove the fixing blocks fixing the permanent magnet shaft generator to the shaft generator stator and the shaft generator rotor, and install an anti-adsorption tool on the shaft generator stator;

[0042] S75, check the sealing condition of the tail shaft by turning the gear. If the sealing condition of the tail shaft meets the requirements, the large container ship can be driven out of the dock by tugboat and towing.

[0043] Furthermore, the step S8 includes the following steps:

[0044] S81, using tugboats and towing, drives the large container ship out of the dock. After the ship is out of the dock, the remaining flange holes and bolts are processed and the flange bolts are tightened.

[0045] S82, after the flange connection is completed, each intermediate bearing is moved up and down, thereby causing the shaft generator rotor to move up and down, and simultaneously adjusting the height of the shaft generator stator to control the synchronization adjustment accuracy of the shaft generator rotor and the shaft generator stator;

[0046] S83, before measuring the bearing top load, ensure that the gap between the shaft generator stator and the shaft generator rotor is in a uniform state, and ensure that the load of each bearing meets the design requirements.

[0047] Compared with the prior art, the beneficial effects of the technical solution of the present invention are:

[0048] The method for installing a permanent magnet shaft generator on a large container ship disclosed in the present invention can effectively reduce the repair period of the large container ship in the dock when installing the permanent magnet shaft generator on the large container ship, thereby saving a large amount of maintenance costs in the dock. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 This is a flow chart of the installation method of a permanent magnet shaft generator for large container ships according to the present invention.

[0050] Figure 2 It is a schematic diagram of the overall structure of the permanent magnet shaft generator in the present invention.

[0051] Figure 3 It is the effect diagram before and after modification in the present invention.

[0052] Figure 4 It is a schematic diagram of the overall structure of the ship when the intermediate shaft is removed.

[0053] Figure 5 It is a schematic diagram of the overall structure of the present invention when the tail shaft is clamped.

[0054] Figure 6 It is a schematic diagram of the overall structure of the central shaft of the Zhongyuan ship when it is hoisted out of the process hole.

[0055] Figure 7 It is a structural schematic diagram of the flange when clamped in the present invention.

[0056] Figure 8It is a structural schematic diagram of the generator stator and the shaft generator rotor in the present invention.

[0057] Figure 9 It is a structural schematic diagram of the present invention for measuring the gap between the generator stator and the shaft generator rotor.

[0058] Figure 10 It is a structural schematic diagram of the present invention in which the front shaft of the shaft generator and the shaft generator stator and rotor are assembled and hoisted into the nacelle as a whole.

[0059] In the figure, 1 is the stator of the shaft generator, 2 is the rotor of the shaft generator, 3 is the front shaft of the shaft generator, 4 is the rear shaft of the shaft generator, 5 is the flange, and 6 is the anti-adsorption tooling. DETAILED DESCRIPTION

[0060] The accompanying drawings are for illustrative purposes only and are not to be construed as limitations on this patent. To better illustrate this embodiment, some components of the accompanying drawings may be omitted, enlarged, or reduced in size, and do not represent the actual dimensions of the product. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted from the accompanying drawings.

[0061] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installation" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, which can be considered as internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances. The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0062] like Figure 1 As shown, a method for installing a permanent magnet shaft generator for a large container ship includes the following steps:

[0063] S1, inspect and measure the status and data of the original intermediate shaft of a large container ship;

[0064] S2: For large container ships in a floating state, pull the tail shaft backwards and remove the original ship's intermediate shaft while ensuring the tail shaft is sealed;

[0065] S3, a process hole is opened in the engine room above the original ship's intermediate shaft, so that the original ship's intermediate shaft can be transported out of the engine room of the large container ship through the process hole;

[0066] S4, shift the front middle bearing of the large container ship forward, install the permanent magnet shaft generator base and hoist the rear shaft of the permanent magnet shaft generator into the engine room of the large container ship for placement;

[0067] S5, after assembling the shaft generator front shaft, the shaft generator stator and the shaft generator rotor, hoist the entire shaft into the engine room of the large container ship and place it on the shaft generator base;

[0068] S6, after placing the permanent magnet shaft generator in place, adjust the shaft generator front shaft and the shaft generator rear shaft so that the flanges of the permanent magnet shaft generator, the shaft generator front shaft and the shaft generator rear shaft are aligned and then clamped, and process flange bolt holes and flange bolts on each flange;

[0069] S7: When the flanges of the permanent magnet shaft generator, the shaft generator front shaft, and the shaft generator rear shaft are installed to meet the requirements of the cranking, the tail shaft seal is checked by cranking to meet the requirements of large container ship undocking;

[0070] S8, control the large container ship to undock, continue to process the remaining flange holes and bolts on the large container ship after undocking, and tighten the flange bolts. After the flange connection is completed, adjust the load of each bearing so that the load of each bearing meets the design requirements.

[0071] Wherein, step S1 includes the following steps:

[0072] S11, respectively measuring the old axis position parameters, old shafting load lifting parameters, old axis opening offset parameters, main engine opening difference parameters and main engine main bearing load lifting parameters of the original ship intermediate shaft of the large container ship;

[0073] S12, place temporary supports under the ends of the shafts that need to be disassembled.

[0074] Wherein, step S2 includes the following steps:

[0075] S21, remove the original ship's intermediate shaft, and pull the tail shaft back 8-12mm while ensuring the tail shaft is sealed;

[0076] S22, uses tooling to lock the tail shaft after it is pulled backward to prevent water flow from hitting the propeller and causing the tail shaft to rotate.

[0077] Wherein, step S3 includes the following steps:

[0078] S31, drill a process hole above the original ship's intermediate shaft, and make the process hole shorter than the original ship's intermediate shaft;

[0079] S32: Keep the floating crane hook stationary, tighten the 50T hoist to rotate the original ship's intermediate shaft 18-40 degrees, then tilt and lift it. Then use the lifting equipment to transport the original ship's intermediate shaft through the process hole out of the engine room of the large container ship.

[0080] Wherein, step S4 includes the following steps:

[0081] S41, shifting the front center bearing forward on large container ships;

[0082] S42, remove the foot block at the bottom of the front middle bearing to lower the height of the front middle bearing;

[0083] S43, while installing the permanent magnet shaft generator base, the rear shaft of the permanent magnet shaft generator is hoisted into the engine room of a large container ship for placement.

[0084] Wherein, step S5 includes the following steps:

[0085] S51, assembling the front shaft of the shaft generator with the shaft generator stator and the shaft generator rotor;

[0086] S52, add auxiliary fixing fixtures to the shaft and generator stator and generator rotor to increase stability;

[0087] S53, after assembling the shaft generator front shaft, the shaft generator stator and the shaft generator rotor, hoist the whole into the engine room of the large container ship and place it on the shaft generator base.

[0088] Wherein, step S6 includes the following steps:

[0089] S61, after the permanent magnet shaft generator is placed in place, the shaft generator rear shaft placed on the side of the engine room of the large container ship is also placed in place;

[0090] S62: Place temporary supports at the front and rear ends of the front and rear axles of the engine. Use the position adjustment bolts at the engine base and the temporary supports to coordinately adjust the positions of the front and rear axles of the engine, aligning the flanges.

[0091] S63, lock the generator stator and rotor with fixed blocks. Use the main engine cranking at the front end of the generator stator and rotor, and use a sling to pull the propeller at the rear end, so that the front and rear shafts rotate on the bearings and temporary supports to align the bolt holes of each pair of flanges.

[0092] S64, align the flanges between the clamping shaft and the front and rear shafts.

[0093] Wherein, step S7 includes the following steps:

[0094] S71, evenly machine half of the bolt holes and bolts on the flanges of the permanent magnet shaft generator, the shaft generator front shaft, and the shaft generator rear shaft, and tighten them to meet the turning requirements;

[0095] S72, reinstall all disassembled intermediate bearings and apply lubricating oil;

[0096] S73, adjust the height of the front intermediate bearing anchor block according to the reinstalled intermediate bearing, and make a new temporary block to temporarily fix the intermediate bearing;

[0097] S74, remove the fixing blocks fixing the permanent magnet shaft generator on the shaft generator stator and the shaft generator rotor, and install the anti-adsorption tool 6 on the shaft generator stator;

[0098] S75, check the sealing condition of the tail shaft by turning the gear. If the sealing condition of the tail shaft meets the requirements, the large container ship can be driven out of the dock by tugboat and towing.

[0099] Wherein, step S8 includes the following steps:

[0100] S81, using tugboats and towing, drives the large container ship out of the dock. After the ship is out of the dock, the remaining flange holes and bolts are processed and the flange bolts are tightened.

[0101] S82, after the flange connection is completed, each intermediate bearing is moved up and down, thereby causing the shaft generator rotor to move up and down, and simultaneously adjusting the height of the shaft generator stator to control the synchronization adjustment accuracy of the shaft generator rotor and the shaft generator stator;

[0102] S83, before measuring the bearing top load, ensure that the gap between the shaft generator stator and the shaft generator rotor is in a uniform state, and ensure that the load of each bearing meets the design requirements.

[0103] The following describes the structure of the permanent magnet shaft generator and its installation steps. The overall structure of the permanent magnet shaft generator is as follows: Figure 2 As shown, it consists of a shaft generator stator 1, a shaft generator rotor 2, a shaft generator front shaft 3, and a shaft generator rear shaft 4. The permanent magnet shaft generator will be installed in the shaft system of the ship and replace a section of the original ship intermediate shaft. The length of the replaced original ship intermediate shaft is equal to the sum of the lengths of the shaft generator front shaft and rear shaft. The effects before and after the modification are shown as follows: Figure 3 shown.

[0104] like Figure 4-10As shown, in order to reduce the docking period, the ship chose to complete the removal of the original ship's intermediate shaft in a floating state, disassemble the original ship's old intermediate shaft, pull the tail shaft back about 10mm, and the size needs to be confirmed by the drawing to avoid excessive pulling and causing the tail shaft seal to fail. Since the tail shaft is pulled back about 10mm, it can provide space for the original ship's intermediate shaft to be lifted out. After the tail shaft moves back 10mm, it needs to be locked with a tool to prevent the water flow from hitting the propeller and causing the tail shaft to rotate. The tool clamps the tail shaft with two semicircular rings and then fixes it to the hull structure by welding. Then, a process hole is opened in the engine room above the original ship's intermediate shaft so that the original ship's intermediate shaft can be transported out of the engine room through the process hole. Due to the limitation of the hull structure, the process hole is shorter than the original ship's intermediate shaft. Therefore, the shaft needs to be tilted at a certain angle when lifting. Due to the large size and weight of the shaft, with a diameter of about 0.85 meters, a length of about 14 meters, and a weight of about 80 tons, its tilted lifting requires additional installation Tooling: After the original ship's intermediate shaft is hoisted out of the cabin, the front intermediate shaft is shifted forward, and the shaft generator base is installed at the same time. At the same time, the rear shaft of the shaft generator is hoisted into the engine room and placed. After the front intermediate bearing is shifted forward, in order to avoid the bearing colliding with the shaft when hoisting the shaft generator, it is necessary to first remove its anchor pads to lower the height of the bearing. After the shaft generator front shaft and the shaft generator stator and rotor are assembled, they are hoisted into the engine room as a whole and placed on the shaft generator base. When the shaft generator is hoisted as a whole, auxiliary fixing tooling needs to be installed to increase its stability to avoid movement due to tilting or shaking during lifting. When the shaft generator is placed as a whole, the shaft generator rear shaft placed on one side of the engine room is also placed in place. Temporary rolling supports are placed at the front and rear ends of the shaft generator front and rear shafts (same as step 1) to prevent the suspended end of the shaft from falling and deforming. Use the position adjustment bolts at the shaft generator base and the temporary rolling supports to coordinately adjust the positions of the front and rear shafts of the shaft generator, align the flanges, and align and clamp the shafts.

[0105] Generally speaking, the axis alignment process is done section by section from front to back. First, adjust the position of the front pair of flanges to align them, that is, the opening offset reaches the standard. Then, the main engine is cranked to complete the alignment of the bolt holes. Then, the pair of flanges are fixed and clamped with temporary bolts. Then, precise bolt holes are machined, and matching bolts are machined according to the size of the bolt holes. Finally, the pair of flanges are tightened with matching bolts. Since the main engine is at the front end, the alignment and clamping process must be completed step by step from front to back. There is no fixed front and back order for the subsequent processing of bolt holes and bolts. However, since the magnetic attraction of the permanent magnet shaft generator is very strong, when the axis is not fixed, the cranking process is very likely to cause the shaft generator stator and shaft generator rotor to adsorb each other. Therefore, during the alignment process of the three pairs of flanges in front and back of the wheel, the stator and rotor of the shaft generator are kept locked with fixed blocks, so that there is no adsorption and cranking. During the alignment process, the main engine is cranked at the front end, and the propeller is pulled by a sling at the rear end, so that the front and rear shafts rotate on the bearings and temporary rolling supports to align the bolt holes of each pair of flanges. First, align the front end of the shaft generator and the rear end of the shaft generator. The flanges at the ends are aligned and clamped. The two pairs of flanges can be aligned and clamped at the same time to reduce the construction period. At this time, the ship is already in the dock, so saving the repair period is very important. Finally, align and clamp the flanges between the front and rear shafts of the shaft. After the alignment and clamping of the three pairs of flanges 5 are completed, start processing the flange bolt holes and flange bolts. Due to the tight dock repair period, frequent cross-docking of various tasks during the docking period, and the complex environment, all work must be implemented to meet the requirements of docking. Therefore, half of the bolt holes and bolts are evenly distributed for the three pairs of flanges, and half of the bolts are tightened on all three pairs of flanges. After that, the cranking requirements of the entire axis can be met. The tail shaft seal can be checked by cranking to meet the requirements for undocking. In order to avoid the adsorption of the stator and rotor during the cranking process, all disassembled intermediate bearings need to be reinstalled and lubricated before cranking, especially the displaced front intermediate bearing. Since the front intermediate bearing has been displaced and the height has changed, it is necessary to re-determine the height of the front intermediate bearing foot pad according to the position of the new axis, and make a new temporary pad to temporarily fix the bearing. The fixing block that fixes the stator and rotor of the shaft-belt generator needs to be removed before cranking. In order to further prevent the adsorption of the stator and rotor during cranking, 12 anti-adsorption tooling needs to be installed on the stator of the shaft generator.

[0106] In the present invention, the standard gap between the shaft generator stator and the shaft generator rotor is 6.5mm. The tool is fixed by a circle of bolt holes on the shaft generator stator to install the fixing block. The light has a battery inside, and the button is at a certain distance from the shaft generator rotor. When the gap between the shaft generator rotor and the shaft generator stator is less than or equal to 4mm, the button switch is closed and the light is on. When the light is on, the host cranking machine is stopped to avoid damage to the equipment due to continuous cranking after the stator and rotor are adsorbed. The gap between the tool body and the rotor is 3mm. Even if the light does not light up due to a malfunction, the tool body will block the rotor to prevent the stator and rotor from adsorbing together. In addition, lubricating oil is applied to the tool body. The position of the tool body corresponding to the inner diameter of the shaft generator rotor is a high-strength steel plate. Short-term contact and friction will not cause obvious damage to the equipment. In actual application, a Bluetooth controller can also be installed in the lamp. When the button is closed, the Bluetooth controller can directly control the cranking machine to stop working.

[0107] After undocking, continue to process the remaining half of the flange holes and bolts, and tighten the flange bolts. After the flange connection is completed, start adjusting the load of each intermediate bearing so that the load of each bearing meets the design requirements (i.e., axis alignment adjustment). The adjustment process requires moving each intermediate bearing up and down, thereby causing the shaft-launched rotor to move up and down. During the adjustment process, the intermediate bearing is in an active state, and the stator and rotor are prone to adsorption, and the adsorption process may drive the active intermediate bearing. During the adjustment process, when measuring the bearing load, the uneven magnetic attraction between the shaft-launched stator and rotor will affect the measurement results of the bearing load.

[0108] In order to avoid the above situation, it is necessary to adjust the height of the shaft generator stator synchronously when adjusting the bearing height to make the shaft generator rotor height change. In order to control the accuracy of the synchronous adjustment of the shaft generator rotor and the shaft generator stator, when the gap between the stator and the rotor is uniform (a fixed block can be temporarily installed to obtain a uniform state of the stator and rotor gap, and the fixed block can be replaced with an anti-adsorption tooling during adjustment), a dial indicator is adsorbed on the upper end of the inner diameter of the shaft generator stator, and the dial indicator needle is placed on the upper end of the inner diameter of the rotor. The reading of the dial indicator is used to confirm the height change difference of the stator generator rotor. When the height change difference reaches 1mm, stop the rotor height change, and adjust the shaft generator stator height so that the dial indicator reading returns to zero. Then adjust the bearing height step by step and control the gap offset between the stator and rotor within 1mm to avoid excessive eccentric magnetic attraction. In order to avoid the eccentric magnetic attraction between the stator and rotor from interfering with the measured value when measuring the bearing load, it is necessary to confirm that the gap between the stator and rotor is uniform before measuring the bearing top load. At this time, it is necessary to measure the gap between the front and rear ends of the stator and rotor in the up, down, left and right directions. Although it can be barely measured with a copper feeler gauge, due to poor measurement conditions, the feeler gauge needs to pass through the blocking piece, and the measurement accuracy cannot be guaranteed.

[0109] In the present invention, the distance from the anti-adsorption tooling to the rotor can be measured to confirm whether the stator-rotor gap is uniform. At this time, the lamp needs to be replaced with a measuring device (a plug with a hole + a measuring rod with a scale). The bearing height adjustment is completed by a jack and adding or removing thin metal gaskets. After the adjustment is completed, the temporary pads and thin metal gaskets need to be removed and replaced with permanent pads to complete the fitting and installation.

[0110] Since the installation of the shaft generator has a significant impact on the load on the shaft system, the project is generally accompanied by the inspection or replacement of the shaft system bearings and the replacement of the propellers. During the ship repair process, it is necessary to minimize the dry dock time to save repair costs. The shaft generator is generally installed in the front part of the shaft system. The intermediate shaft of some ships is divided into a front intermediate shaft and a rear intermediate shaft. The process includes the removal of the rear intermediate shaft.

[0111] In the figure, the description of the positional relationship is only for illustrative purposes and should not be understood as a limitation on this patent; obviously, the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A method for installing a permanent magnet shaft generator on a large container ship, characterized by: The following steps are involved: S1, inspect and measure the status and data of the original intermediate shaft of a large container ship; S2: For large container ships in a floating state, pull the tail shaft backwards and remove the original ship's intermediate shaft while ensuring the tail shaft is sealed; S3, a process hole is opened in the engine room above the original ship's intermediate shaft, so that the original ship's intermediate shaft can be transported out of the engine room of the large container ship through the process hole; S4, shift the front middle bearing of the large container ship forward, install the permanent magnet shaft generator base and hoist the rear shaft of the permanent magnet shaft generator into the engine room of the large container ship for placement; S5, after assembling the shaft generator front shaft, the shaft generator stator and the shaft generator rotor, hoist the entire shaft into the engine room of the large container ship and place it on the shaft generator base; S6, after placing the permanent magnet shaft generator in place, adjust the shaft generator front shaft and the shaft generator rear shaft so that the flanges of the permanent magnet shaft generator, the shaft generator front shaft and the shaft generator rear shaft are aligned and then clamped, and process flange bolt holes and flange bolts on each flange; S7: When the flanges of the permanent magnet shaft generator, the shaft generator front shaft, and the shaft generator rear shaft are installed to meet the requirements of the cranking, the tail shaft seal is checked by cranking to meet the requirements of large container ship undocking; S8, control the large container ship to undock, continue to process the remaining flange holes and bolts on the large container ship after undocking, and tighten the flange bolts. After the flange connection is completed, adjust the load of each bearing so that the load of each bearing meets the design requirements.

2. The method for installing a permanent magnet shaft generator for a large container ship according to claim 1, characterized in that: The step S1 comprises the following steps: S11, respectively measuring the old axis position parameters, old shafting load lifting parameters, old axis opening offset parameters, main engine opening difference parameters and main engine main bearing load lifting parameters of the original ship intermediate shaft of the large container ship; S12, place temporary supports under the ends of the shafts that need to be disassembled.

3. The method for installing a permanent magnet shaft generator for a large container ship according to claim 1, characterized in that: The step S2 comprises the following steps: S21, remove the original ship's intermediate shaft, and pull the tail shaft back 8-12mm while ensuring the tail shaft is sealed; S22, uses tooling to lock the tail shaft after it is pulled backward to prevent water flow from hitting the propeller and causing the tail shaft to rotate.

4. The method for installing a permanent magnet shaft generator for a large container ship according to claim 1, characterized in that: The step S3 comprises the following steps: S31, drill a process hole above the original ship's intermediate shaft, and make the process hole shorter than the original ship's intermediate shaft; S32: Keep the floating crane hook stationary, tighten the 50T hoist to rotate the original ship's intermediate shaft 18-40 degrees, then tilt and lift it. Then use the lifting equipment to transport the original ship's intermediate shaft through the process hole out of the engine room of the large container ship.

5. The method for installing a permanent magnet shaft generator for a large container ship according to claim 1, characterized in that: The step S4 comprises the following steps: S41, shifting the front center bearing forward on large container ships; S42, remove the foot block at the bottom of the front middle bearing to lower the height of the front middle bearing; S43, while installing the permanent magnet shaft generator base, the rear shaft of the permanent magnet shaft generator is hoisted into the engine room of a large container ship for placement.

6. The method for installing a permanent magnet shaft generator for a large container ship according to claim 1, characterized in that: The step S5 comprises the following steps: S51, assembling the front shaft of the shaft generator with the shaft generator stator and the shaft generator rotor; S52, add auxiliary fixing fixtures to the shaft and generator stator and generator rotor to increase stability; S53, after assembling the shaft generator front shaft, the shaft generator stator and the shaft generator rotor, hoist the whole into the engine room of the large container ship and place it on the shaft generator base.

7. The method for installing a permanent magnet shaft generator for a large container ship according to claim 1, characterized in that: The step S6 comprises the following steps: S61, after the permanent magnet shaft generator is placed in place, the shaft generator rear shaft placed on the side of the engine room of the large container ship is also placed in place; S62: Place temporary supports at the front and rear ends of the front and rear axles of the engine. Use the position adjustment bolts at the engine base and the temporary supports to coordinately adjust the positions of the front and rear axles of the engine, aligning the flanges. S63, lock the generator stator and rotor with fixed blocks. Use the main engine cranking at the front end of the generator stator and rotor, and use a sling to pull the propeller at the rear end, so that the front and rear shafts rotate on the bearings and temporary supports to align the bolt holes of each pair of flanges. S64, align the flanges between the clamping shaft and the front and rear shafts.

8. The method for installing a permanent magnet shaft generator for a large container ship according to claim 1, characterized in that: The step S7 comprises the following steps: S71, evenly machine half of the bolt holes and bolts on the flanges of the permanent magnet shaft generator, the shaft generator front shaft, and the shaft generator rear shaft, and tighten them to meet the turning requirements; S72, reinstall all disassembled intermediate bearings and apply lubricating oil; S73, adjust the height of the front intermediate bearing anchor block according to the reinstalled intermediate bearing, and make a new temporary block to temporarily fix the intermediate bearing; S74, remove the fixing blocks fixing the permanent magnet shaft generator to the shaft generator stator and the shaft generator rotor, and install an anti-adsorption tool on the shaft generator stator; S75, check the sealing condition of the tail shaft by turning the gear. If the sealing condition of the tail shaft meets the requirements, the large container ship can be driven out of the dock by tugboat and towing.

9. The method for installing a permanent magnet shaft generator for a large container ship according to claim 1, characterized in that: The step S8 comprises the following steps: S81, using tugboats and towing, drives the large container ship out of the dock. After the ship is out of the dock, the remaining flange holes and bolts are processed and the flange bolts are tightened. S82, after the flange connection is completed, each intermediate bearing is moved up and down, thereby causing the shaft generator rotor to move up and down, and simultaneously adjusting the height of the shaft generator stator to control the synchronization adjustment accuracy of the shaft generator rotor and the shaft generator stator; S83, before measuring the bearing top load, ensure that the gap between the shaft generator stator and the shaft generator rotor is in a uniform state, and ensure that the load of each bearing meets the design requirements.

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